drivers/target/iscsi/iscsi_target_login.c

   1 /*******************************************************************************
   2  * This file contains the login functions used by the iSCSI Target driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <target/target_core_base.h>
  26 #include <target/target_core_transport.h>
  27
  28 #include "iscsi_target_core.h"
  29 #include "iscsi_target_tq.h"
  30 #include "iscsi_target_device.h"
  31 #include "iscsi_target_nego.h"
  32 #include "iscsi_target_erl0.h"
  33 #include "iscsi_target_erl2.h"
  34 #include "iscsi_target_login.h"
  35 #include "iscsi_target_stat.h"
  36 #include "iscsi_target_tpg.h"
  37 #include "iscsi_target_util.h"
  38 #include "iscsi_target.h"
  39 #include "iscsi_target_parameters.h"
  40
  41 extern struct idr sess_idr;
  42 extern struct mutex auth_id_lock;
  43 extern spinlock_t sess_idr_lock;
  44
  45 static int iscsi_login_init_conn(struct iscsi_conn *conn)
  46 {
  47         init_waitqueue_head(&conn->queues_wq);
  48         INIT_LIST_HEAD(&conn->conn_list);
  49         INIT_LIST_HEAD(&conn->conn_cmd_list);
  50         INIT_LIST_HEAD(&conn->immed_queue_list);
  51         INIT_LIST_HEAD(&conn->response_queue_list);
  52         init_completion(&conn->conn_post_wait_comp);
  53         init_completion(&conn->conn_wait_comp);
  54         init_completion(&conn->conn_wait_rcfr_comp);
  55         init_completion(&conn->conn_waiting_on_uc_comp);
  56         init_completion(&conn->conn_logout_comp);
  57         init_completion(&conn->rx_half_close_comp);
  58         init_completion(&conn->tx_half_close_comp);
  59         spin_lock_init(&conn->cmd_lock);
  60         spin_lock_init(&conn->conn_usage_lock);
  61         spin_lock_init(&conn->immed_queue_lock);
  62         spin_lock_init(&conn->nopin_timer_lock);
  63         spin_lock_init(&conn->response_queue_lock);
  64         spin_lock_init(&conn->state_lock);
  65
  66         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  67                 pr_err("Unable to allocate conn->conn_cpumask\n");
  68                 return -ENOMEM;
  69         }
  70
  71         return 0;
  72 }
  73
  74 /*
  75  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  76  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  77  */
  78 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  79 {
  80         /*
  81          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  82          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  83          * to software 1x8 byte slicing from crc32c.ko
  84          */
  85         conn->conn_rx_hash.flags = 0;
  86         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  87                                                 CRYPTO_ALG_ASYNC);
  88         if (IS_ERR(conn->conn_rx_hash.tfm)) {
  89                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
  90                 return -ENOMEM;
  91         }
  92
  93         conn->conn_tx_hash.flags = 0;
  94         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  95                                                 CRYPTO_ALG_ASYNC);
  96         if (IS_ERR(conn->conn_tx_hash.tfm)) {
  97                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
  98                 crypto_free_hash(conn->conn_rx_hash.tfm);
  99                 return -ENOMEM;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static int iscsi_login_check_initiator_version(
 106         struct iscsi_conn *conn,
 107         u8 version_max,
 108         u8 version_min)
 109 {
 110         if ((version_max != 0x00) || (version_min != 0x00)) {
 111                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 112                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 113                         version_min, version_max);
 114                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 115                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 116                 return -1;
 117         }
 118
 119         return 0;
 120 }
 121
 122 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 123 {
 124         int sessiontype;
 125         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 126         struct iscsi_portal_group *tpg = conn->tpg;
 127         struct iscsi_session *sess = NULL, *sess_p = NULL;
 128         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 129         struct se_session *se_sess, *se_sess_tmp;
 130
 131         initiatorname_param = iscsi_find_param_from_key(
 132                         INITIATORNAME, conn->param_list);
 133         sessiontype_param = iscsi_find_param_from_key(
 134                         SESSIONTYPE, conn->param_list);
 135         if (!initiatorname_param || !sessiontype_param) {
 136                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 137                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 138                 return -1;
 139         }
 140
 141         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 142
 143         spin_lock_bh(&se_tpg->session_lock);
 144         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 145                         sess_list) {
 146
 147                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 148                 spin_lock(&sess_p->conn_lock);
 149                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 150                     atomic_read(&sess_p->session_logout) ||
 151                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 152                         spin_unlock(&sess_p->conn_lock);
 153                         continue;
 154                 }
 155                 if (!memcmp((void *)sess_p->isid, (void *)conn->sess->isid, 6) &&
 156                    (!strcmp((void *)sess_p->sess_ops->InitiatorName,
 157                             (void *)initiatorname_param->value) &&
 158                    (sess_p->sess_ops->SessionType == sessiontype))) {
 159                         atomic_set(&sess_p->session_reinstatement, 1);
 160                         spin_unlock(&sess_p->conn_lock);
 161                         iscsit_inc_session_usage_count(sess_p);
 162                         iscsit_stop_time2retain_timer(sess_p);
 163                         sess = sess_p;
 164                         break;
 165                 }
 166                 spin_unlock(&sess_p->conn_lock);
 167         }
 168         spin_unlock_bh(&se_tpg->session_lock);
 169         /*
 170          * If the Time2Retain handler has expired, the session is already gone.
 171          */
 172         if (!sess)
 173                 return 0;
 174
 175         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 176                 " preforming session reinstatement.\n", (sessiontype) ?
 177                 "Discovery" : "Normal", sess->sid,
 178                 sess->sess_ops->InitiatorName);
 179
 180         spin_lock_bh(&sess->conn_lock);
 181         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 182                 spin_unlock_bh(&sess->conn_lock);
 183                 iscsit_dec_session_usage_count(sess);
 184                 return iscsit_close_session(sess);
 185         }
 186         spin_unlock_bh(&sess->conn_lock);
 187
 188         iscsit_stop_session(sess, 1, 1);
 189         iscsit_dec_session_usage_count(sess);
 190
 191         return iscsit_close_session(sess);
 192 }
 193
 194 static void iscsi_login_set_conn_values(
 195         struct iscsi_session *sess,
 196         struct iscsi_conn *conn,
 197         u16 cid)
 198 {
 199         conn->sess              = sess;
 200         conn->cid               = cid;
 201         /*
 202          * Generate a random Status sequence number (statsn) for the new
 203          * iSCSI connection.
 204          */
 205         get_random_bytes(&conn->stat_sn, sizeof(u32));
 206
 207         mutex_lock(&auth_id_lock);
 208         conn->auth_id           = iscsit_global->auth_id++;
 209         mutex_unlock(&auth_id_lock);
 210 }
 211
 212 /*
 213  *      This is the leading connection of a new session,
 214  *      or session reinstatement.
 215  */
 216 static int iscsi_login_zero_tsih_s1(
 217         struct iscsi_conn *conn,
 218         unsigned char *buf)
 219 {
 220         struct iscsi_session *sess = NULL;
 221         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 222
 223         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 224         if (!sess) {
 225                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 226                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 227                 pr_err("Could not allocate memory for session\n");
 228                 return -ENOMEM;
 229         }
 230
 231         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 232         sess->init_task_tag     = pdu->itt;
 233         memcpy((void *)&sess->isid, (void *)pdu->isid, 6);
 234         sess->exp_cmd_sn        = pdu->cmdsn;
 235         INIT_LIST_HEAD(&sess->sess_conn_list);
 236         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 237         INIT_LIST_HEAD(&sess->cr_active_list);
 238         INIT_LIST_HEAD(&sess->cr_inactive_list);
 239         init_completion(&sess->async_msg_comp);
 240         init_completion(&sess->reinstatement_comp);
 241         init_completion(&sess->session_wait_comp);
 242         init_completion(&sess->session_waiting_on_uc_comp);
 243         mutex_init(&sess->cmdsn_mutex);
 244         spin_lock_init(&sess->conn_lock);
 245         spin_lock_init(&sess->cr_a_lock);
 246         spin_lock_init(&sess->cr_i_lock);
 247         spin_lock_init(&sess->session_usage_lock);
 248         spin_lock_init(&sess->ttt_lock);
 249
 250         if (!idr_pre_get(&sess_idr, GFP_KERNEL)) {
 251                 pr_err("idr_pre_get() for sess_idr failed\n");
 252                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 253                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 254                 kfree(sess);
 255                 return -ENOMEM;
 256         }
 257         spin_lock(&sess_idr_lock);
 258         idr_get_new(&sess_idr, NULL, &sess->session_index);
 259         spin_unlock(&sess_idr_lock);
 260
 261         sess->creation_time = get_jiffies_64();
 262         spin_lock_init(&sess->session_stats_lock);
 263         /*
 264          * The FFP CmdSN window values will be allocated from the TPG's
 265          * Initiator Node's ACL once the login has been successfully completed.
 266          */
 267         sess->max_cmd_sn        = pdu->cmdsn;
 268
 269         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 270         if (!sess->sess_ops) {
 271                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 272                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 273                 pr_err("Unable to allocate memory for"
 274                                 " struct iscsi_sess_ops.\n");
 275                 kfree(sess);
 276                 return -ENOMEM;
 277         }
 278
 279         sess->se_sess = transport_init_session();
 280         if (IS_ERR(sess->se_sess)) {
 281                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 282                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 283                 kfree(sess);
 284                 return -ENOMEM;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int iscsi_login_zero_tsih_s2(
 291         struct iscsi_conn *conn)
 292 {
 293         struct iscsi_node_attrib *na;
 294         struct iscsi_session *sess = conn->sess;
 295         unsigned char buf[32];
 296
 297         sess->tpg = conn->tpg;
 298
 299         /*
 300          * Assign a new TPG Session Handle.  Note this is protected with
 301          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 302          */
 303         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 304         if (!sess->tsih)
 305                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 306
 307         /*
 308          * Create the default params from user defined values..
 309          */
 310         if (iscsi_copy_param_list(&conn->param_list,
 311                                 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
 312                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 313                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 314                 return -1;
 315         }
 316
 317         iscsi_set_keys_to_negotiate(0, conn->param_list);
 318
 319         if (sess->sess_ops->SessionType)
 320                 return iscsi_set_keys_irrelevant_for_discovery(
 321                                 conn->param_list);
 322
 323         na = iscsit_tpg_get_node_attrib(sess);
 324
 325         /*
 326          * Need to send TargetPortalGroupTag back in first login response
 327          * on any iSCSI connection where the Initiator provides TargetName.
 328          * See 5.3.1.  Login Phase Start
 329          *
 330          * In our case, we have already located the struct iscsi_tiqn at this point.
 331          */
 332         memset(buf, 0, 32);
 333         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 334         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 335                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 336                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 337                 return -1;
 338         }
 339
 340         /*
 341          * Workaround for Initiators that have broken connection recovery logic.
 342          *
 343          * "We would really like to get rid of this." Linux-iSCSI.org team
 344          */
 345         memset(buf, 0, 32);
 346         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 347         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 348                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 349                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 350                 return -1;
 351         }
 352
 353         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 354                 return -1;
 355
 356         return 0;
 357 }
 358
 359 /*
 360  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 361  * The Initiator node will be able to enable FIM by proposing them itself.
 362  */
 363 int iscsi_login_disable_FIM_keys(
 364         struct iscsi_param_list *param_list,
 365         struct iscsi_conn *conn)
 366 {
 367         struct iscsi_param *param;
 368
 369         param = iscsi_find_param_from_key("OFMarker", param_list);
 370         if (!param) {
 371                 pr_err("iscsi_find_param_from_key() for"
 372                                 " OFMarker failed\n");
 373                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 374                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 375                 return -1;
 376         }
 377         param->state &= ~PSTATE_NEGOTIATE;
 378
 379         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 380         if (!param) {
 381                 pr_err("iscsi_find_param_from_key() for"
 382                                 " IFMarker failed\n");
 383                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 384                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 385                 return -1;
 386         }
 387         param->state &= ~PSTATE_NEGOTIATE;
 388
 389         param = iscsi_find_param_from_key("IFMarker", param_list);
 390         if (!param) {
 391                 pr_err("iscsi_find_param_from_key() for"
 392                                 " IFMarker failed\n");
 393                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 394                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 395                 return -1;
 396         }
 397         param->state &= ~PSTATE_NEGOTIATE;
 398
 399         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 400         if (!param) {
 401                 pr_err("iscsi_find_param_from_key() for"
 402                                 " IFMarker failed\n");
 403                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 404                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 405                 return -1;
 406         }
 407         param->state &= ~PSTATE_NEGOTIATE;
 408
 409         return 0;
 410 }
 411
 412 static int iscsi_login_non_zero_tsih_s1(
 413         struct iscsi_conn *conn,
 414         unsigned char *buf)
 415 {
 416         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 417
 418         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 419         return 0;
 420 }
 421
 422 /*
 423  *      Add a new connection to an existing session.
 424  */
 425 static int iscsi_login_non_zero_tsih_s2(
 426         struct iscsi_conn *conn,
 427         unsigned char *buf)
 428 {
 429         struct iscsi_portal_group *tpg = conn->tpg;
 430         struct iscsi_session *sess = NULL, *sess_p = NULL;
 431         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 432         struct se_session *se_sess, *se_sess_tmp;
 433         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 434
 435         spin_lock_bh(&se_tpg->session_lock);
 436         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 437                         sess_list) {
 438
 439                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 440                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 441                     atomic_read(&sess_p->session_logout) ||
 442                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 443                         continue;
 444                 if (!memcmp((const void *)sess_p->isid,
 445                      (const void *)pdu->isid, 6) &&
 446                      (sess_p->tsih == pdu->tsih)) {
 447                         iscsit_inc_session_usage_count(sess_p);
 448                         iscsit_stop_time2retain_timer(sess_p);
 449                         sess = sess_p;
 450                         break;
 451                 }
 452         }
 453         spin_unlock_bh(&se_tpg->session_lock);
 454
 455         /*
 456          * If the Time2Retain handler has expired, the session is already gone.
 457          */
 458         if (!sess) {
 459                 pr_err("Initiator attempting to add a connection to"
 460                         " a non-existent session, rejecting iSCSI Login.\n");
 461                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 462                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 463                 return -1;
 464         }
 465
 466         /*
 467          * Stop the Time2Retain timer if this is a failed session, we restart
 468          * the timer if the login is not successful.
 469          */
 470         spin_lock_bh(&sess->conn_lock);
 471         if (sess->session_state == TARG_SESS_STATE_FAILED)
 472                 atomic_set(&sess->session_continuation, 1);
 473         spin_unlock_bh(&sess->conn_lock);
 474
 475         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 476
 477         if (iscsi_copy_param_list(&conn->param_list,
 478                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 479                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 480                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 481                 return -1;
 482         }
 483
 484         iscsi_set_keys_to_negotiate(0, conn->param_list);
 485         /*
 486          * Need to send TargetPortalGroupTag back in first login response
 487          * on any iSCSI connection where the Initiator provides TargetName.
 488          * See 5.3.1.  Login Phase Start
 489          *
 490          * In our case, we have already located the struct iscsi_tiqn at this point.
 491          */
 492         memset(buf, 0, 32);
 493         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 494         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 495                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 496                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 497                 return -1;
 498         }
 499
 500         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 501 }
 502
 503 int iscsi_login_post_auth_non_zero_tsih(
 504         struct iscsi_conn *conn,
 505         u16 cid,
 506         u32 exp_statsn)
 507 {
 508         struct iscsi_conn *conn_ptr = NULL;
 509         struct iscsi_conn_recovery *cr = NULL;
 510         struct iscsi_session *sess = conn->sess;
 511
 512         /*
 513          * By following item 5 in the login table,  if we have found
 514          * an existing ISID and a valid/existing TSIH and an existing
 515          * CID we do connection reinstatement.  Currently we dont not
 516          * support it so we send back an non-zero status class to the
 517          * initiator and release the new connection.
 518          */
 519         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 520         if ((conn_ptr)) {
 521                 pr_err("Connection exists with CID %hu for %s,"
 522                         " performing connection reinstatement.\n",
 523                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 524
 525                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 526                 iscsit_dec_conn_usage_count(conn_ptr);
 527         }
 528
 529         /*
 530          * Check for any connection recovery entires containing CID.
 531          * We use the original ExpStatSN sent in the first login request
 532          * to acknowledge commands for the failed connection.
 533          *
 534          * Also note that an explict logout may have already been sent,
 535          * but the response may not be sent due to additional connection
 536          * loss.
 537          */
 538         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 539                 cr = iscsit_get_inactive_connection_recovery_entry(
 540                                 sess, cid);
 541                 if ((cr)) {
 542                         pr_debug("Performing implicit logout"
 543                                 " for connection recovery on CID: %hu\n",
 544                                         conn->cid);
 545                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 546                 }
 547         }
 548
 549         /*
 550          * Else we follow item 4 from the login table in that we have
 551          * found an existing ISID and a valid/existing TSIH and a new
 552          * CID we go ahead and continue to add a new connection to the
 553          * session.
 554          */
 555         pr_debug("Adding CID %hu to existing session for %s.\n",
 556                         cid, sess->sess_ops->InitiatorName);
 557
 558         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 559                 pr_err("Adding additional connection to this session"
 560                         " would exceed MaxConnections %d, login failed.\n",
 561                                 sess->sess_ops->MaxConnections);
 562                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 563                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 564                 return -1;
 565         }
 566
 567         return 0;
 568 }
 569
 570 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 571 {
 572         struct iscsi_session *sess = conn->sess;
 573
 574         if (!sess->sess_ops->SessionType)
 575                 iscsit_start_nopin_timer(conn);
 576 }
 577
 578 static int iscsi_post_login_handler(
 579         struct iscsi_np *np,
 580         struct iscsi_conn *conn,
 581         u8 zero_tsih)
 582 {
 583         int stop_timer = 0;
 584         struct iscsi_session *sess = conn->sess;
 585         struct se_session *se_sess = sess->se_sess;
 586         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 587         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 588         struct iscsi_thread_set *ts;
 589
 590         iscsit_inc_conn_usage_count(conn);
 591
 592         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 593                         ISCSI_LOGIN_STATUS_ACCEPT);
 594
 595         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 596         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 597
 598         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 599         iscsit_set_sync_and_steering_values(conn);
 600         /*
 601          * SCSI Initiator -> SCSI Target Port Mapping
 602          */
 603         ts = iscsi_get_thread_set();
 604         if (!zero_tsih) {
 605                 iscsi_set_session_parameters(sess->sess_ops,
 606                                 conn->param_list, 0);
 607                 iscsi_release_param_list(conn->param_list);
 608                 conn->param_list = NULL;
 609
 610                 spin_lock_bh(&sess->conn_lock);
 611                 atomic_set(&sess->session_continuation, 0);
 612                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 613                         pr_debug("Moving to"
 614                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 615                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 616                         stop_timer = 1;
 617                 }
 618
 619                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 620                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 621                         conn->local_ip, conn->local_port, tpg->tpgt);
 622
 623                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 624                 atomic_inc(&sess->nconn);
 625                 pr_debug("Incremented iSCSI Connection count to %hu"
 626                         " from node: %s\n", atomic_read(&sess->nconn),
 627                         sess->sess_ops->InitiatorName);
 628                 spin_unlock_bh(&sess->conn_lock);
 629
 630                 iscsi_post_login_start_timers(conn);
 631                 iscsi_activate_thread_set(conn, ts);
 632                 /*
 633                  * Determine CPU mask to ensure connection's RX and TX kthreads
 634                  * are scheduled on the same CPU.
 635                  */
 636                 iscsit_thread_get_cpumask(conn);
 637                 conn->conn_rx_reset_cpumask = 1;
 638                 conn->conn_tx_reset_cpumask = 1;
 639
 640                 iscsit_dec_conn_usage_count(conn);
 641                 if (stop_timer) {
 642                         spin_lock_bh(&se_tpg->session_lock);
 643                         iscsit_stop_time2retain_timer(sess);
 644                         spin_unlock_bh(&se_tpg->session_lock);
 645                 }
 646                 iscsit_dec_session_usage_count(sess);
 647                 return 0;
 648         }
 649
 650         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 651         iscsi_release_param_list(conn->param_list);
 652         conn->param_list = NULL;
 653
 654         iscsit_determine_maxcmdsn(sess);
 655
 656         spin_lock_bh(&se_tpg->session_lock);
 657         __transport_register_session(&sess->tpg->tpg_se_tpg,
 658                         se_sess->se_node_acl, se_sess, (void *)sess);
 659         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 660         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 661
 662         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 663                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 664                 tpg->tpgt);
 665
 666         spin_lock_bh(&sess->conn_lock);
 667         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 668         atomic_inc(&sess->nconn);
 669         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 670                 " %s\n", atomic_read(&sess->nconn),
 671                 sess->sess_ops->InitiatorName);
 672         spin_unlock_bh(&sess->conn_lock);
 673
 674         sess->sid = tpg->sid++;
 675         if (!sess->sid)
 676                 sess->sid = tpg->sid++;
 677         pr_debug("Established iSCSI session from node: %s\n",
 678                         sess->sess_ops->InitiatorName);
 679
 680         tpg->nsessions++;
 681         if (tpg->tpg_tiqn)
 682                 tpg->tpg_tiqn->tiqn_nsessions++;
 683
 684         pr_debug("Incremented number of active iSCSI sessions to %u on"
 685                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 686         spin_unlock_bh(&se_tpg->session_lock);
 687
 688         iscsi_post_login_start_timers(conn);
 689         iscsi_activate_thread_set(conn, ts);
 690         /*
 691          * Determine CPU mask to ensure connection's RX and TX kthreads
 692          * are scheduled on the same CPU.
 693          */
 694         iscsit_thread_get_cpumask(conn);
 695         conn->conn_rx_reset_cpumask = 1;
 696         conn->conn_tx_reset_cpumask = 1;
 697
 698         iscsit_dec_conn_usage_count(conn);
 699
 700         return 0;
 701 }
 702
 703 static void iscsi_handle_login_thread_timeout(unsigned long data)
 704 {
 705         struct iscsi_np *np = (struct iscsi_np *) data;
 706
 707         spin_lock_bh(&np->np_thread_lock);
 708         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 709                         np->np_ip, np->np_port);
 710
 711         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 712                 spin_unlock_bh(&np->np_thread_lock);
 713                 return;
 714         }
 715
 716         if (np->np_thread)
 717                 send_sig(SIGINT, np->np_thread, 1);
 718
 719         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 720         spin_unlock_bh(&np->np_thread_lock);
 721 }
 722
 723 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 724 {
 725         /*
 726          * This used the TA_LOGIN_TIMEOUT constant because at this
 727          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 728          */
 729         spin_lock_bh(&np->np_thread_lock);
 730         init_timer(&np->np_login_timer);
 731         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 732         np->np_login_timer.data = (unsigned long)np;
 733         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 734         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 735         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 736         add_timer(&np->np_login_timer);
 737
 738         pr_debug("Added timeout timer to iSCSI login request for"
 739                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 740         spin_unlock_bh(&np->np_thread_lock);
 741 }
 742
 743 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 744 {
 745         spin_lock_bh(&np->np_thread_lock);
 746         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 747                 spin_unlock_bh(&np->np_thread_lock);
 748                 return;
 749         }
 750         np->np_login_timer_flags |= ISCSI_TF_STOP;
 751         spin_unlock_bh(&np->np_thread_lock);
 752
 753         del_timer_sync(&np->np_login_timer);
 754
 755         spin_lock_bh(&np->np_thread_lock);
 756         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 757         spin_unlock_bh(&np->np_thread_lock);
 758 }
 759
 760 int iscsi_target_setup_login_socket(
 761         struct iscsi_np *np,
 762         struct __kernel_sockaddr_storage *sockaddr)
 763 {
 764         struct socket *sock;
 765         int backlog = 5, ret, opt = 0, len;
 766
 767         switch (np->np_network_transport) {
 768         case ISCSI_TCP:
 769                 np->np_ip_proto = IPPROTO_TCP;
 770                 np->np_sock_type = SOCK_STREAM;
 771                 break;
 772         case ISCSI_SCTP_TCP:
 773                 np->np_ip_proto = IPPROTO_SCTP;
 774                 np->np_sock_type = SOCK_STREAM;
 775                 break;
 776         case ISCSI_SCTP_UDP:
 777                 np->np_ip_proto = IPPROTO_SCTP;
 778                 np->np_sock_type = SOCK_SEQPACKET;
 779                 break;
 780         case ISCSI_IWARP_TCP:
 781         case ISCSI_IWARP_SCTP:
 782         case ISCSI_INFINIBAND:
 783         default:
 784                 pr_err("Unsupported network_transport: %d\n",
 785                                 np->np_network_transport);
 786                 return -EINVAL;
 787         }
 788
 789         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 790                         np->np_ip_proto, &sock);
 791         if (ret < 0) {
 792                 pr_err("sock_create() failed.\n");
 793                 return ret;
 794         }
 795         np->np_socket = sock;
 796         /*
 797          * Setup the np->np_sockaddr from the passed sockaddr setup
 798          * in iscsi_target_configfs.c code..
 799          */
 800         memcpy((void *)&np->np_sockaddr, (void *)sockaddr,
 801                         sizeof(struct __kernel_sockaddr_storage));
 802
 803         if (sockaddr->ss_family == AF_INET6)
 804                 len = sizeof(struct sockaddr_in6);
 805         else
 806                 len = sizeof(struct sockaddr_in);
 807         /*
 808          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 809          */
 810         opt = 1;
 811         if (np->np_network_transport == ISCSI_TCP) {
 812                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 813                                 (char *)&opt, sizeof(opt));
 814                 if (ret < 0) {
 815                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 816                                 " failed: %d\n", ret);
 817                         goto fail;
 818                 }
 819         }
 820
 821         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 822                         (char *)&opt, sizeof(opt));
 823         if (ret < 0) {
 824                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 825                         " failed\n");
 826                 goto fail;
 827         }
 828
 829         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 830         if (ret < 0) {
 831                 pr_err("kernel_bind() failed: %d\n", ret);
 832                 goto fail;
 833         }
 834
 835         ret = kernel_listen(sock, backlog);
 836         if (ret != 0) {
 837                 pr_err("kernel_listen() failed: %d\n", ret);
 838                 goto fail;
 839         }
 840
 841         return 0;
 842
 843 fail:
 844         np->np_socket = NULL;
 845         if (sock)
 846                 sock_release(sock);
 847         return ret;
 848 }
 849
 850 static int __iscsi_target_login_thread(struct iscsi_np *np)
 851 {
 852         u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
 853         int err, ret = 0, ip_proto, sock_type, stop;
 854         struct iscsi_conn *conn = NULL;
 855         struct iscsi_login *login;
 856         struct iscsi_portal_group *tpg = NULL;
 857         struct socket *new_sock, *sock;
 858         struct kvec iov;
 859         struct iscsi_login_req *pdu;
 860         struct sockaddr_in sock_in;
 861         struct sockaddr_in6 sock_in6;
 862
 863         flush_signals(current);
 864         sock = np->np_socket;
 865         ip_proto = np->np_ip_proto;
 866         sock_type = np->np_sock_type;
 867
 868         spin_lock_bh(&np->np_thread_lock);
 869         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 870                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 871                 complete(&np->np_restart_comp);
 872         } else {
 873                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 874         }
 875         spin_unlock_bh(&np->np_thread_lock);
 876
 877         if (kernel_accept(sock, &new_sock, 0) < 0) {
 878                 spin_lock_bh(&np->np_thread_lock);
 879                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 880                         spin_unlock_bh(&np->np_thread_lock);
 881                         complete(&np->np_restart_comp);
 882                         /* Get another socket */
 883                         return 1;
 884                 }
 885                 spin_unlock_bh(&np->np_thread_lock);
 886                 goto out;
 887         }
 888         iscsi_start_login_thread_timer(np);
 889
 890         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
 891         if (!conn) {
 892                 pr_err("Could not allocate memory for"
 893                         " new connection\n");
 894                 sock_release(new_sock);
 895                 /* Get another socket */
 896                 return 1;
 897         }
 898
 899         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
 900         conn->conn_state = TARG_CONN_STATE_FREE;
 901         conn->sock = new_sock;
 902
 903         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
 904         conn->conn_state = TARG_CONN_STATE_XPT_UP;
 905
 906         /*
 907          * Allocate conn->conn_ops early as a failure calling
 908          * iscsit_tx_login_rsp() below will call tx_data().
 909          */
 910         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
 911         if (!conn->conn_ops) {
 912                 pr_err("Unable to allocate memory for"
 913                         " struct iscsi_conn_ops.\n");
 914                 goto new_sess_out;
 915         }
 916         /*
 917          * Perform the remaining iSCSI connection initialization items..
 918          */
 919         if (iscsi_login_init_conn(conn) < 0)
 920                 goto new_sess_out;
 921
 922         memset(buffer, 0, ISCSI_HDR_LEN);
 923         memset(&iov, 0, sizeof(struct kvec));
 924         iov.iov_base    = buffer;
 925         iov.iov_len     = ISCSI_HDR_LEN;
 926
 927         if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
 928                 pr_err("rx_data() returned an error.\n");
 929                 goto new_sess_out;
 930         }
 931
 932         iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
 933         if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
 934                 pr_err("First opcode is not login request,"
 935                         " failing login request.\n");
 936                 goto new_sess_out;
 937         }
 938
 939         pdu                     = (struct iscsi_login_req *) buffer;
 940         pdu->cid                = be16_to_cpu(pdu->cid);
 941         pdu->tsih               = be16_to_cpu(pdu->tsih);
 942         pdu->itt                = be32_to_cpu(pdu->itt);
 943         pdu->cmdsn              = be32_to_cpu(pdu->cmdsn);
 944         pdu->exp_statsn         = be32_to_cpu(pdu->exp_statsn);
 945         /*
 946          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
 947          * when Status-Class != 0.
 948         */
 949         conn->login_itt         = pdu->itt;
 950
 951         spin_lock_bh(&np->np_thread_lock);
 952         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 953                 spin_unlock_bh(&np->np_thread_lock);
 954                 pr_err("iSCSI Network Portal on %s:%hu currently not"
 955                         " active.\n", np->np_ip, np->np_port);
 956                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 957                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 958                 goto new_sess_out;
 959         }
 960         spin_unlock_bh(&np->np_thread_lock);
 961
 962         if (np->np_sockaddr.ss_family == AF_INET6) {
 963                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 964
 965                 if (conn->sock->ops->getname(conn->sock,
 966                                 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
 967                         pr_err("sock_ops->getname() failed.\n");
 968                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 969                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 970                         goto new_sess_out;
 971                 }
 972                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
 973                                 &sock_in6.sin6_addr.in6_u);
 974                 conn->login_port = ntohs(sock_in6.sin6_port);
 975
 976                 if (conn->sock->ops->getname(conn->sock,
 977                                 (struct sockaddr *)&sock_in6, &err, 0) < 0) {
 978                         pr_err("sock_ops->getname() failed.\n");
 979                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 980                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 981                         goto new_sess_out;
 982                 }
 983                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
 984                                 &sock_in6.sin6_addr.in6_u);
 985                 conn->local_port = ntohs(sock_in6.sin6_port);
 986
 987         } else {
 988                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
 989
 990                 if (conn->sock->ops->getname(conn->sock,
 991                                 (struct sockaddr *)&sock_in, &err, 1) < 0) {
 992                         pr_err("sock_ops->getname() failed.\n");
 993                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 994                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 995                         goto new_sess_out;
 996                 }
 997                 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
 998                 conn->login_port = ntohs(sock_in.sin_port);
 999
1000                 if (conn->sock->ops->getname(conn->sock,
1001                                 (struct sockaddr *)&sock_in, &err, 0) < 0) {
1002                         pr_err("sock_ops->getname() failed.\n");
1003                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1004                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1005                         goto new_sess_out;
1006                 }
1007                 sprintf(conn->local_ip, "%pI4", &sock_in.sin_addr.s_addr);
1008                 conn->local_port = ntohs(sock_in.sin_port);
1009         }
1010
1011         conn->network_transport = np->np_network_transport;
1012
1013         pr_debug("Received iSCSI login request from %s on %s Network"
1014                         " Portal %s:%hu\n", conn->login_ip,
1015                 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1016                         conn->local_ip, conn->local_port);
1017
1018         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1019         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1020
1021         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1022                         pdu->min_version) < 0)
1023                 goto new_sess_out;
1024
1025         zero_tsih = (pdu->tsih == 0x0000);
1026         if ((zero_tsih)) {
1027                 /*
1028                  * This is the leading connection of a new session.
1029                  * We wait until after authentication to check for
1030                  * session reinstatement.
1031                  */
1032                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1033                         goto new_sess_out;
1034         } else {
1035                 /*
1036                  * Add a new connection to an existing session.
1037                  * We check for a non-existant session in
1038                  * iscsi_login_non_zero_tsih_s2() below based
1039                  * on ISID/TSIH, but wait until after authentication
1040                  * to check for connection reinstatement, etc.
1041                  */
1042                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1043                         goto new_sess_out;
1044         }
1045
1046         /*
1047          * This will process the first login request, and call
1048          * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1049          */
1050         login = iscsi_target_init_negotiation(np, conn, buffer);
1051         if (!login) {
1052                 tpg = conn->tpg;
1053                 goto new_sess_out;
1054         }
1055
1056         tpg = conn->tpg;
1057         if (!tpg) {
1058                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1059                 goto new_sess_out;
1060         }
1061
1062         if (zero_tsih) {
1063                 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1064                         iscsi_target_nego_release(login, conn);
1065                         goto new_sess_out;
1066                 }
1067         } else {
1068                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1069                         iscsi_target_nego_release(login, conn);
1070                         goto old_sess_out;
1071                 }
1072         }
1073
1074         if (iscsi_target_start_negotiation(login, conn) < 0)
1075                 goto new_sess_out;
1076
1077         if (!conn->sess) {
1078                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1079                 goto new_sess_out;
1080         }
1081
1082         iscsi_stop_login_thread_timer(np);
1083
1084         if (signal_pending(current))
1085                 goto new_sess_out;
1086
1087         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1088
1089         if (ret < 0)
1090                 goto new_sess_out;
1091
1092         iscsit_deaccess_np(np, tpg);
1093         tpg = NULL;
1094         /* Get another socket */
1095         return 1;
1096
1097 new_sess_out:
1098         pr_err("iSCSI Login negotiation failed.\n");
1099         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1100                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1101         if (!zero_tsih || !conn->sess)
1102                 goto old_sess_out;
1103         if (conn->sess->se_sess)
1104                 transport_free_session(conn->sess->se_sess);
1105         if (conn->sess->session_index != 0) {
1106                 spin_lock_bh(&sess_idr_lock);
1107                 idr_remove(&sess_idr, conn->sess->session_index);
1108                 spin_unlock_bh(&sess_idr_lock);
1109         }
1110         if (conn->sess->sess_ops)
1111                 kfree(conn->sess->sess_ops);
1112         if (conn->sess)
1113                 kfree(conn->sess);
1114 old_sess_out:
1115         iscsi_stop_login_thread_timer(np);
1116         /*
1117          * If login negotiation fails check if the Time2Retain timer
1118          * needs to be restarted.
1119          */
1120         if (!zero_tsih && conn->sess) {
1121                 spin_lock_bh(&conn->sess->conn_lock);
1122                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1123                         struct se_portal_group *se_tpg =
1124                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1125
1126                         atomic_set(&conn->sess->session_continuation, 0);
1127                         spin_unlock_bh(&conn->sess->conn_lock);
1128                         spin_lock_bh(&se_tpg->session_lock);
1129                         iscsit_start_time2retain_handler(conn->sess);
1130                         spin_unlock_bh(&se_tpg->session_lock);
1131                 } else
1132                         spin_unlock_bh(&conn->sess->conn_lock);
1133                 iscsit_dec_session_usage_count(conn->sess);
1134         }
1135
1136         if (!IS_ERR(conn->conn_rx_hash.tfm))
1137                 crypto_free_hash(conn->conn_rx_hash.tfm);
1138         if (!IS_ERR(conn->conn_tx_hash.tfm))
1139                 crypto_free_hash(conn->conn_tx_hash.tfm);
1140
1141         if (conn->conn_cpumask)
1142                 free_cpumask_var(conn->conn_cpumask);
1143
1144         kfree(conn->conn_ops);
1145
1146         if (conn->param_list) {
1147                 iscsi_release_param_list(conn->param_list);
1148                 conn->param_list = NULL;
1149         }
1150         if (conn->sock)
1151                 sock_release(conn->sock);
1152         kfree(conn);
1153
1154         if (tpg) {
1155                 iscsit_deaccess_np(np, tpg);
1156                 tpg = NULL;
1157         }
1158
1159 out:
1160         stop = kthread_should_stop();
1161         if (!stop && signal_pending(current)) {
1162                 spin_lock_bh(&np->np_thread_lock);
1163                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1164                 spin_unlock_bh(&np->np_thread_lock);
1165         }
1166         /* Wait for another socket.. */
1167         if (!stop)
1168                 return 1;
1169
1170         iscsi_stop_login_thread_timer(np);
1171         spin_lock_bh(&np->np_thread_lock);
1172         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1173         spin_unlock_bh(&np->np_thread_lock);
1174         return 0;
1175 }
1176
1177 int iscsi_target_login_thread(void *arg)
1178 {
1179         struct iscsi_np *np = (struct iscsi_np *)arg;
1180         int ret;
1181
1182         allow_signal(SIGINT);
1183
1184         while (!kthread_should_stop()) {
1185                 ret = __iscsi_target_login_thread(np);
1186                 /*
1187                  * We break and exit here unless another sock_accept() call
1188                  * is expected.
1189                  */
1190                 if (ret != 1)
1191                         break;
1192         }
1193
1194         return 0;
1195 }