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 <linux/idr.h>
  25 #include <scsi/iscsi_proto.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include "iscsi_target_core.h"
  30 #include "iscsi_target_tq.h"
  31 #include "iscsi_target_device.h"
  32 #include "iscsi_target_nego.h"
  33 #include "iscsi_target_erl0.h"
  34 #include "iscsi_target_erl2.h"
  35 #include "iscsi_target_login.h"
  36 #include "iscsi_target_stat.h"
  37 #include "iscsi_target_tpg.h"
  38 #include "iscsi_target_util.h"
  39 #include "iscsi_target.h"
  40 #include "iscsi_target_parameters.h"
  41
  42 static int iscsi_login_init_conn(struct iscsi_conn *conn)
  43 {
  44         init_waitqueue_head(&conn->queues_wq);
  45         INIT_LIST_HEAD(&conn->conn_list);
  46         INIT_LIST_HEAD(&conn->conn_cmd_list);
  47         INIT_LIST_HEAD(&conn->immed_queue_list);
  48         INIT_LIST_HEAD(&conn->response_queue_list);
  49         init_completion(&conn->conn_post_wait_comp);
  50         init_completion(&conn->conn_wait_comp);
  51         init_completion(&conn->conn_wait_rcfr_comp);
  52         init_completion(&conn->conn_waiting_on_uc_comp);
  53         init_completion(&conn->conn_logout_comp);
  54         init_completion(&conn->rx_half_close_comp);
  55         init_completion(&conn->tx_half_close_comp);
  56         spin_lock_init(&conn->cmd_lock);
  57         spin_lock_init(&conn->conn_usage_lock);
  58         spin_lock_init(&conn->immed_queue_lock);
  59         spin_lock_init(&conn->nopin_timer_lock);
  60         spin_lock_init(&conn->response_queue_lock);
  61         spin_lock_init(&conn->state_lock);
  62
  63         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  64                 pr_err("Unable to allocate conn->conn_cpumask\n");
  65                 return -ENOMEM;
  66         }
  67
  68         return 0;
  69 }
  70
  71 /*
  72  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  73  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  74  */
  75 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  76 {
  77         /*
  78          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  79          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  80          * to software 1x8 byte slicing from crc32c.ko
  81          */
  82         conn->conn_rx_hash.flags = 0;
  83         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  84                                                 CRYPTO_ALG_ASYNC);
  85         if (IS_ERR(conn->conn_rx_hash.tfm)) {
  86                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
  87                 return -ENOMEM;
  88         }
  89
  90         conn->conn_tx_hash.flags = 0;
  91         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  92                                                 CRYPTO_ALG_ASYNC);
  93         if (IS_ERR(conn->conn_tx_hash.tfm)) {
  94                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
  95                 crypto_free_hash(conn->conn_rx_hash.tfm);
  96                 return -ENOMEM;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int iscsi_login_check_initiator_version(
 103         struct iscsi_conn *conn,
 104         u8 version_max,
 105         u8 version_min)
 106 {
 107         if ((version_max != 0x00) || (version_min != 0x00)) {
 108                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 109                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 110                         version_min, version_max);
 111                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 112                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 113                 return -1;
 114         }
 115
 116         return 0;
 117 }
 118
 119 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 120 {
 121         int sessiontype;
 122         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 123         struct iscsi_portal_group *tpg = conn->tpg;
 124         struct iscsi_session *sess = NULL, *sess_p = NULL;
 125         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 126         struct se_session *se_sess, *se_sess_tmp;
 127
 128         initiatorname_param = iscsi_find_param_from_key(
 129                         INITIATORNAME, conn->param_list);
 130         sessiontype_param = iscsi_find_param_from_key(
 131                         SESSIONTYPE, conn->param_list);
 132         if (!initiatorname_param || !sessiontype_param) {
 133                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 134                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 135                 return -1;
 136         }
 137
 138         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 139
 140         spin_lock_bh(&se_tpg->session_lock);
 141         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 142                         sess_list) {
 143
 144                 sess_p = se_sess->fabric_sess_ptr;
 145                 spin_lock(&sess_p->conn_lock);
 146                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 147                     atomic_read(&sess_p->session_logout) ||
 148                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 149                         spin_unlock(&sess_p->conn_lock);
 150                         continue;
 151                 }
 152                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 153                    (!strcmp(sess_p->sess_ops->InitiatorName,
 154                             initiatorname_param->value) &&
 155                    (sess_p->sess_ops->SessionType == sessiontype))) {
 156                         atomic_set(&sess_p->session_reinstatement, 1);
 157                         spin_unlock(&sess_p->conn_lock);
 158                         iscsit_inc_session_usage_count(sess_p);
 159                         iscsit_stop_time2retain_timer(sess_p);
 160                         sess = sess_p;
 161                         break;
 162                 }
 163                 spin_unlock(&sess_p->conn_lock);
 164         }
 165         spin_unlock_bh(&se_tpg->session_lock);
 166         /*
 167          * If the Time2Retain handler has expired, the session is already gone.
 168          */
 169         if (!sess)
 170                 return 0;
 171
 172         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 173                 " preforming session reinstatement.\n", (sessiontype) ?
 174                 "Discovery" : "Normal", sess->sid,
 175                 sess->sess_ops->InitiatorName);
 176
 177         spin_lock_bh(&sess->conn_lock);
 178         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 179                 spin_unlock_bh(&sess->conn_lock);
 180                 iscsit_dec_session_usage_count(sess);
 181                 target_put_session(sess->se_sess);
 182                 return 0;
 183         }
 184         spin_unlock_bh(&sess->conn_lock);
 185
 186         iscsit_stop_session(sess, 1, 1);
 187         iscsit_dec_session_usage_count(sess);
 188
 189         target_put_session(sess->se_sess);
 190         return 0;
 191 }
 192
 193 static void iscsi_login_set_conn_values(
 194         struct iscsi_session *sess,
 195         struct iscsi_conn *conn,
 196         __be16 cid)
 197 {
 198         conn->sess              = sess;
 199         conn->cid               = be16_to_cpu(cid);
 200         /*
 201          * Generate a random Status sequence number (statsn) for the new
 202          * iSCSI connection.
 203          */
 204         get_random_bytes(&conn->stat_sn, sizeof(u32));
 205
 206         mutex_lock(&auth_id_lock);
 207         conn->auth_id           = iscsit_global->auth_id++;
 208         mutex_unlock(&auth_id_lock);
 209 }
 210
 211 /*
 212  *      This is the leading connection of a new session,
 213  *      or session reinstatement.
 214  */
 215 static int iscsi_login_zero_tsih_s1(
 216         struct iscsi_conn *conn,
 217         unsigned char *buf)
 218 {
 219         struct iscsi_session *sess = NULL;
 220         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 221         int ret;
 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(&sess->isid, pdu->isid, 6);
 234         sess->exp_cmd_sn        = be32_to_cpu(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         idr_preload(GFP_KERNEL);
 251         spin_lock_bh(&sess_idr_lock);
 252         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 253         if (ret >= 0)
 254                 sess->session_index = ret;
 255         spin_unlock_bh(&sess_idr_lock);
 256         idr_preload_end();
 257
 258         if (ret < 0) {
 259                 pr_err("idr_alloc() for sess_idr failed\n");
 260                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 261                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 262                 kfree(sess);
 263                 return -ENOMEM;
 264         }
 265
 266         sess->creation_time = get_jiffies_64();
 267         spin_lock_init(&sess->session_stats_lock);
 268         /*
 269          * The FFP CmdSN window values will be allocated from the TPG's
 270          * Initiator Node's ACL once the login has been successfully completed.
 271          */
 272         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 273
 274         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 275         if (!sess->sess_ops) {
 276                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 277                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 278                 pr_err("Unable to allocate memory for"
 279                                 " struct iscsi_sess_ops.\n");
 280                 kfree(sess);
 281                 return -ENOMEM;
 282         }
 283
 284         sess->se_sess = transport_init_session();
 285         if (IS_ERR(sess->se_sess)) {
 286                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 287                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 288                 kfree(sess);
 289                 return -ENOMEM;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int iscsi_login_zero_tsih_s2(
 296         struct iscsi_conn *conn)
 297 {
 298         struct iscsi_node_attrib *na;
 299         struct iscsi_session *sess = conn->sess;
 300         unsigned char buf[32];
 301
 302         sess->tpg = conn->tpg;
 303
 304         /*
 305          * Assign a new TPG Session Handle.  Note this is protected with
 306          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 307          */
 308         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 309         if (!sess->tsih)
 310                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 311
 312         /*
 313          * Create the default params from user defined values..
 314          */
 315         if (iscsi_copy_param_list(&conn->param_list,
 316                                 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
 317                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 318                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 319                 return -1;
 320         }
 321
 322         iscsi_set_keys_to_negotiate(0, conn->param_list);
 323
 324         if (sess->sess_ops->SessionType)
 325                 return iscsi_set_keys_irrelevant_for_discovery(
 326                                 conn->param_list);
 327
 328         na = iscsit_tpg_get_node_attrib(sess);
 329
 330         /*
 331          * Need to send TargetPortalGroupTag back in first login response
 332          * on any iSCSI connection where the Initiator provides TargetName.
 333          * See 5.3.1.  Login Phase Start
 334          *
 335          * In our case, we have already located the struct iscsi_tiqn at this point.
 336          */
 337         memset(buf, 0, 32);
 338         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 339         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 340                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 341                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 342                 return -1;
 343         }
 344
 345         /*
 346          * Workaround for Initiators that have broken connection recovery logic.
 347          *
 348          * "We would really like to get rid of this." Linux-iSCSI.org team
 349          */
 350         memset(buf, 0, 32);
 351         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 352         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 353                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 354                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 355                 return -1;
 356         }
 357
 358         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 359                 return -1;
 360
 361         return 0;
 362 }
 363
 364 /*
 365  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 366  * The Initiator node will be able to enable FIM by proposing them itself.
 367  */
 368 int iscsi_login_disable_FIM_keys(
 369         struct iscsi_param_list *param_list,
 370         struct iscsi_conn *conn)
 371 {
 372         struct iscsi_param *param;
 373
 374         param = iscsi_find_param_from_key("OFMarker", param_list);
 375         if (!param) {
 376                 pr_err("iscsi_find_param_from_key() for"
 377                                 " OFMarker failed\n");
 378                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 379                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 380                 return -1;
 381         }
 382         param->state &= ~PSTATE_NEGOTIATE;
 383
 384         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 385         if (!param) {
 386                 pr_err("iscsi_find_param_from_key() for"
 387                                 " IFMarker failed\n");
 388                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 389                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 390                 return -1;
 391         }
 392         param->state &= ~PSTATE_NEGOTIATE;
 393
 394         param = iscsi_find_param_from_key("IFMarker", param_list);
 395         if (!param) {
 396                 pr_err("iscsi_find_param_from_key() for"
 397                                 " IFMarker failed\n");
 398                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 399                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 400                 return -1;
 401         }
 402         param->state &= ~PSTATE_NEGOTIATE;
 403
 404         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 405         if (!param) {
 406                 pr_err("iscsi_find_param_from_key() for"
 407                                 " IFMarker failed\n");
 408                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 409                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 410                 return -1;
 411         }
 412         param->state &= ~PSTATE_NEGOTIATE;
 413
 414         return 0;
 415 }
 416
 417 static int iscsi_login_non_zero_tsih_s1(
 418         struct iscsi_conn *conn,
 419         unsigned char *buf)
 420 {
 421         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 422
 423         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 424         return 0;
 425 }
 426
 427 /*
 428  *      Add a new connection to an existing session.
 429  */
 430 static int iscsi_login_non_zero_tsih_s2(
 431         struct iscsi_conn *conn,
 432         unsigned char *buf)
 433 {
 434         struct iscsi_portal_group *tpg = conn->tpg;
 435         struct iscsi_session *sess = NULL, *sess_p = NULL;
 436         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 437         struct se_session *se_sess, *se_sess_tmp;
 438         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 439
 440         spin_lock_bh(&se_tpg->session_lock);
 441         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 442                         sess_list) {
 443
 444                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 445                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 446                     atomic_read(&sess_p->session_logout) ||
 447                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 448                         continue;
 449                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 450                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 451                         iscsit_inc_session_usage_count(sess_p);
 452                         iscsit_stop_time2retain_timer(sess_p);
 453                         sess = sess_p;
 454                         break;
 455                 }
 456         }
 457         spin_unlock_bh(&se_tpg->session_lock);
 458
 459         /*
 460          * If the Time2Retain handler has expired, the session is already gone.
 461          */
 462         if (!sess) {
 463                 pr_err("Initiator attempting to add a connection to"
 464                         " a non-existent session, rejecting iSCSI Login.\n");
 465                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 466                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 467                 return -1;
 468         }
 469
 470         /*
 471          * Stop the Time2Retain timer if this is a failed session, we restart
 472          * the timer if the login is not successful.
 473          */
 474         spin_lock_bh(&sess->conn_lock);
 475         if (sess->session_state == TARG_SESS_STATE_FAILED)
 476                 atomic_set(&sess->session_continuation, 1);
 477         spin_unlock_bh(&sess->conn_lock);
 478
 479         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 480
 481         if (iscsi_copy_param_list(&conn->param_list,
 482                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 483                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 484                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 485                 return -1;
 486         }
 487
 488         iscsi_set_keys_to_negotiate(0, conn->param_list);
 489         /*
 490          * Need to send TargetPortalGroupTag back in first login response
 491          * on any iSCSI connection where the Initiator provides TargetName.
 492          * See 5.3.1.  Login Phase Start
 493          *
 494          * In our case, we have already located the struct iscsi_tiqn at this point.
 495          */
 496         memset(buf, 0, 32);
 497         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 498         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 499                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 500                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 501                 return -1;
 502         }
 503
 504         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 505 }
 506
 507 int iscsi_login_post_auth_non_zero_tsih(
 508         struct iscsi_conn *conn,
 509         u16 cid,
 510         u32 exp_statsn)
 511 {
 512         struct iscsi_conn *conn_ptr = NULL;
 513         struct iscsi_conn_recovery *cr = NULL;
 514         struct iscsi_session *sess = conn->sess;
 515
 516         /*
 517          * By following item 5 in the login table,  if we have found
 518          * an existing ISID and a valid/existing TSIH and an existing
 519          * CID we do connection reinstatement.  Currently we dont not
 520          * support it so we send back an non-zero status class to the
 521          * initiator and release the new connection.
 522          */
 523         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 524         if (conn_ptr) {
 525                 pr_err("Connection exists with CID %hu for %s,"
 526                         " performing connection reinstatement.\n",
 527                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 528
 529                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 530                 iscsit_dec_conn_usage_count(conn_ptr);
 531         }
 532
 533         /*
 534          * Check for any connection recovery entires containing CID.
 535          * We use the original ExpStatSN sent in the first login request
 536          * to acknowledge commands for the failed connection.
 537          *
 538          * Also note that an explict logout may have already been sent,
 539          * but the response may not be sent due to additional connection
 540          * loss.
 541          */
 542         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 543                 cr = iscsit_get_inactive_connection_recovery_entry(
 544                                 sess, cid);
 545                 if (cr) {
 546                         pr_debug("Performing implicit logout"
 547                                 " for connection recovery on CID: %hu\n",
 548                                         conn->cid);
 549                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 550                 }
 551         }
 552
 553         /*
 554          * Else we follow item 4 from the login table in that we have
 555          * found an existing ISID and a valid/existing TSIH and a new
 556          * CID we go ahead and continue to add a new connection to the
 557          * session.
 558          */
 559         pr_debug("Adding CID %hu to existing session for %s.\n",
 560                         cid, sess->sess_ops->InitiatorName);
 561
 562         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 563                 pr_err("Adding additional connection to this session"
 564                         " would exceed MaxConnections %d, login failed.\n",
 565                                 sess->sess_ops->MaxConnections);
 566                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 567                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 568                 return -1;
 569         }
 570
 571         return 0;
 572 }
 573
 574 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 575 {
 576         struct iscsi_session *sess = conn->sess;
 577
 578         if (!sess->sess_ops->SessionType)
 579                 iscsit_start_nopin_timer(conn);
 580 }
 581
 582 static int iscsi_post_login_handler(
 583         struct iscsi_np *np,
 584         struct iscsi_conn *conn,
 585         u8 zero_tsih)
 586 {
 587         int stop_timer = 0;
 588         struct iscsi_session *sess = conn->sess;
 589         struct se_session *se_sess = sess->se_sess;
 590         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 591         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 592         struct iscsi_thread_set *ts;
 593
 594         iscsit_inc_conn_usage_count(conn);
 595
 596         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 597                         ISCSI_LOGIN_STATUS_ACCEPT);
 598
 599         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 600         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 601
 602         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 603         iscsit_set_sync_and_steering_values(conn);
 604         /*
 605          * SCSI Initiator -> SCSI Target Port Mapping
 606          */
 607         ts = iscsi_get_thread_set();
 608         if (!zero_tsih) {
 609                 iscsi_set_session_parameters(sess->sess_ops,
 610                                 conn->param_list, 0);
 611                 iscsi_release_param_list(conn->param_list);
 612                 conn->param_list = NULL;
 613
 614                 spin_lock_bh(&sess->conn_lock);
 615                 atomic_set(&sess->session_continuation, 0);
 616                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 617                         pr_debug("Moving to"
 618                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 619                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 620                         stop_timer = 1;
 621                 }
 622
 623                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 624                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 625                         conn->local_ip, conn->local_port, tpg->tpgt);
 626
 627                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 628                 atomic_inc(&sess->nconn);
 629                 pr_debug("Incremented iSCSI Connection count to %hu"
 630                         " from node: %s\n", atomic_read(&sess->nconn),
 631                         sess->sess_ops->InitiatorName);
 632                 spin_unlock_bh(&sess->conn_lock);
 633
 634                 iscsi_post_login_start_timers(conn);
 635                 iscsi_activate_thread_set(conn, ts);
 636                 /*
 637                  * Determine CPU mask to ensure connection's RX and TX kthreads
 638                  * are scheduled on the same CPU.
 639                  */
 640                 iscsit_thread_get_cpumask(conn);
 641                 conn->conn_rx_reset_cpumask = 1;
 642                 conn->conn_tx_reset_cpumask = 1;
 643
 644                 iscsit_dec_conn_usage_count(conn);
 645                 if (stop_timer) {
 646                         spin_lock_bh(&se_tpg->session_lock);
 647                         iscsit_stop_time2retain_timer(sess);
 648                         spin_unlock_bh(&se_tpg->session_lock);
 649                 }
 650                 iscsit_dec_session_usage_count(sess);
 651                 return 0;
 652         }
 653
 654         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 655         iscsi_release_param_list(conn->param_list);
 656         conn->param_list = NULL;
 657
 658         iscsit_determine_maxcmdsn(sess);
 659
 660         spin_lock_bh(&se_tpg->session_lock);
 661         __transport_register_session(&sess->tpg->tpg_se_tpg,
 662                         se_sess->se_node_acl, se_sess, sess);
 663         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 664         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 665
 666         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 667                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 668                 tpg->tpgt);
 669
 670         spin_lock_bh(&sess->conn_lock);
 671         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 672         atomic_inc(&sess->nconn);
 673         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 674                 " %s\n", atomic_read(&sess->nconn),
 675                 sess->sess_ops->InitiatorName);
 676         spin_unlock_bh(&sess->conn_lock);
 677
 678         sess->sid = tpg->sid++;
 679         if (!sess->sid)
 680                 sess->sid = tpg->sid++;
 681         pr_debug("Established iSCSI session from node: %s\n",
 682                         sess->sess_ops->InitiatorName);
 683
 684         tpg->nsessions++;
 685         if (tpg->tpg_tiqn)
 686                 tpg->tpg_tiqn->tiqn_nsessions++;
 687
 688         pr_debug("Incremented number of active iSCSI sessions to %u on"
 689                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 690         spin_unlock_bh(&se_tpg->session_lock);
 691
 692         iscsi_post_login_start_timers(conn);
 693         iscsi_activate_thread_set(conn, ts);
 694         /*
 695          * Determine CPU mask to ensure connection's RX and TX kthreads
 696          * are scheduled on the same CPU.
 697          */
 698         iscsit_thread_get_cpumask(conn);
 699         conn->conn_rx_reset_cpumask = 1;
 700         conn->conn_tx_reset_cpumask = 1;
 701
 702         iscsit_dec_conn_usage_count(conn);
 703
 704         return 0;
 705 }
 706
 707 static void iscsi_handle_login_thread_timeout(unsigned long data)
 708 {
 709         struct iscsi_np *np = (struct iscsi_np *) data;
 710
 711         spin_lock_bh(&np->np_thread_lock);
 712         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 713                         np->np_ip, np->np_port);
 714
 715         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 716                 spin_unlock_bh(&np->np_thread_lock);
 717                 return;
 718         }
 719
 720         if (np->np_thread)
 721                 send_sig(SIGINT, np->np_thread, 1);
 722
 723         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 724         spin_unlock_bh(&np->np_thread_lock);
 725 }
 726
 727 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 728 {
 729         /*
 730          * This used the TA_LOGIN_TIMEOUT constant because at this
 731          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 732          */
 733         spin_lock_bh(&np->np_thread_lock);
 734         init_timer(&np->np_login_timer);
 735         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 736         np->np_login_timer.data = (unsigned long)np;
 737         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 738         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 739         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 740         add_timer(&np->np_login_timer);
 741
 742         pr_debug("Added timeout timer to iSCSI login request for"
 743                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 744         spin_unlock_bh(&np->np_thread_lock);
 745 }
 746
 747 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 748 {
 749         spin_lock_bh(&np->np_thread_lock);
 750         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 751                 spin_unlock_bh(&np->np_thread_lock);
 752                 return;
 753         }
 754         np->np_login_timer_flags |= ISCSI_TF_STOP;
 755         spin_unlock_bh(&np->np_thread_lock);
 756
 757         del_timer_sync(&np->np_login_timer);
 758
 759         spin_lock_bh(&np->np_thread_lock);
 760         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 761         spin_unlock_bh(&np->np_thread_lock);
 762 }
 763
 764 int iscsi_target_setup_login_socket(
 765         struct iscsi_np *np,
 766         struct __kernel_sockaddr_storage *sockaddr)
 767 {
 768         struct socket *sock;
 769         int backlog = 5, ret, opt = 0, len;
 770
 771         switch (np->np_network_transport) {
 772         case ISCSI_TCP:
 773                 np->np_ip_proto = IPPROTO_TCP;
 774                 np->np_sock_type = SOCK_STREAM;
 775                 break;
 776         case ISCSI_SCTP_TCP:
 777                 np->np_ip_proto = IPPROTO_SCTP;
 778                 np->np_sock_type = SOCK_STREAM;
 779                 break;
 780         case ISCSI_SCTP_UDP:
 781                 np->np_ip_proto = IPPROTO_SCTP;
 782                 np->np_sock_type = SOCK_SEQPACKET;
 783                 break;
 784         case ISCSI_IWARP_TCP:
 785         case ISCSI_IWARP_SCTP:
 786         case ISCSI_INFINIBAND:
 787         default:
 788                 pr_err("Unsupported network_transport: %d\n",
 789                                 np->np_network_transport);
 790                 return -EINVAL;
 791         }
 792
 793         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 794                         np->np_ip_proto, &sock);
 795         if (ret < 0) {
 796                 pr_err("sock_create() failed.\n");
 797                 return ret;
 798         }
 799         np->np_socket = sock;
 800         /*
 801          * Setup the np->np_sockaddr from the passed sockaddr setup
 802          * in iscsi_target_configfs.c code..
 803          */
 804         memcpy(&np->np_sockaddr, sockaddr,
 805                         sizeof(struct __kernel_sockaddr_storage));
 806
 807         if (sockaddr->ss_family == AF_INET6)
 808                 len = sizeof(struct sockaddr_in6);
 809         else
 810                 len = sizeof(struct sockaddr_in);
 811         /*
 812          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 813          */
 814         /* FIXME: Someone please explain why this is endian-safe */
 815         opt = 1;
 816         if (np->np_network_transport == ISCSI_TCP) {
 817                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 818                                 (char *)&opt, sizeof(opt));
 819                 if (ret < 0) {
 820                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 821                                 " failed: %d\n", ret);
 822                         goto fail;
 823                 }
 824         }
 825
 826         /* FIXME: Someone please explain why this is endian-safe */
 827         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 828                         (char *)&opt, sizeof(opt));
 829         if (ret < 0) {
 830                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 831                         " failed\n");
 832                 goto fail;
 833         }
 834
 835         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 836                         (char *)&opt, sizeof(opt));
 837         if (ret < 0) {
 838                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 839                         " failed\n");
 840                 goto fail;
 841         }
 842
 843         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 844         if (ret < 0) {
 845                 pr_err("kernel_bind() failed: %d\n", ret);
 846                 goto fail;
 847         }
 848
 849         ret = kernel_listen(sock, backlog);
 850         if (ret != 0) {
 851                 pr_err("kernel_listen() failed: %d\n", ret);
 852                 goto fail;
 853         }
 854
 855         return 0;
 856
 857 fail:
 858         np->np_socket = NULL;
 859         if (sock)
 860                 sock_release(sock);
 861         return ret;
 862 }
 863
 864 static int __iscsi_target_login_thread(struct iscsi_np *np)
 865 {
 866         u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
 867         int err, ret = 0, stop;
 868         struct iscsi_conn *conn = NULL;
 869         struct iscsi_login *login;
 870         struct iscsi_portal_group *tpg = NULL;
 871         struct socket *new_sock, *sock;
 872         struct kvec iov;
 873         struct iscsi_login_req *pdu;
 874         struct sockaddr_in sock_in;
 875         struct sockaddr_in6 sock_in6;
 876
 877         flush_signals(current);
 878         sock = np->np_socket;
 879
 880         spin_lock_bh(&np->np_thread_lock);
 881         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 882                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 883                 complete(&np->np_restart_comp);
 884         } else {
 885                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 886         }
 887         spin_unlock_bh(&np->np_thread_lock);
 888
 889         if (kernel_accept(sock, &new_sock, 0) < 0) {
 890                 spin_lock_bh(&np->np_thread_lock);
 891                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 892                         spin_unlock_bh(&np->np_thread_lock);
 893                         complete(&np->np_restart_comp);
 894                         /* Get another socket */
 895                         return 1;
 896                 }
 897                 spin_unlock_bh(&np->np_thread_lock);
 898                 goto out;
 899         }
 900         iscsi_start_login_thread_timer(np);
 901
 902         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
 903         if (!conn) {
 904                 pr_err("Could not allocate memory for"
 905                         " new connection\n");
 906                 sock_release(new_sock);
 907                 /* Get another socket */
 908                 return 1;
 909         }
 910
 911         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
 912         conn->conn_state = TARG_CONN_STATE_FREE;
 913         conn->sock = new_sock;
 914
 915         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
 916         conn->conn_state = TARG_CONN_STATE_XPT_UP;
 917
 918         /*
 919          * Allocate conn->conn_ops early as a failure calling
 920          * iscsit_tx_login_rsp() below will call tx_data().
 921          */
 922         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
 923         if (!conn->conn_ops) {
 924                 pr_err("Unable to allocate memory for"
 925                         " struct iscsi_conn_ops.\n");
 926                 goto new_sess_out;
 927         }
 928         /*
 929          * Perform the remaining iSCSI connection initialization items..
 930          */
 931         if (iscsi_login_init_conn(conn) < 0)
 932                 goto new_sess_out;
 933
 934         memset(buffer, 0, ISCSI_HDR_LEN);
 935         memset(&iov, 0, sizeof(struct kvec));
 936         iov.iov_base    = buffer;
 937         iov.iov_len     = ISCSI_HDR_LEN;
 938
 939         if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
 940                 pr_err("rx_data() returned an error.\n");
 941                 goto new_sess_out;
 942         }
 943
 944         iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
 945         if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
 946                 pr_err("First opcode is not login request,"
 947                         " failing login request.\n");
 948                 goto new_sess_out;
 949         }
 950
 951         pdu                     = (struct iscsi_login_req *) buffer;
 952
 953         /*
 954          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
 955          * when Status-Class != 0.
 956         */
 957         conn->login_itt         = pdu->itt;
 958
 959         spin_lock_bh(&np->np_thread_lock);
 960         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 961                 spin_unlock_bh(&np->np_thread_lock);
 962                 pr_err("iSCSI Network Portal on %s:%hu currently not"
 963                         " active.\n", np->np_ip, np->np_port);
 964                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 965                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
 966                 goto new_sess_out;
 967         }
 968         spin_unlock_bh(&np->np_thread_lock);
 969
 970         if (np->np_sockaddr.ss_family == AF_INET6) {
 971                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 972
 973                 if (conn->sock->ops->getname(conn->sock,
 974                                 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
 975                         pr_err("sock_ops->getname() failed.\n");
 976                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 977                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 978                         goto new_sess_out;
 979                 }
 980                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
 981                                 &sock_in6.sin6_addr.in6_u);
 982                 conn->login_port = ntohs(sock_in6.sin6_port);
 983
 984                 if (conn->sock->ops->getname(conn->sock,
 985                                 (struct sockaddr *)&sock_in6, &err, 0) < 0) {
 986                         pr_err("sock_ops->getname() failed.\n");
 987                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 988                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 989                         goto new_sess_out;
 990                 }
 991                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
 992                                 &sock_in6.sin6_addr.in6_u);
 993                 conn->local_port = ntohs(sock_in6.sin6_port);
 994
 995         } else {
 996                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
 997
 998                 if (conn->sock->ops->getname(conn->sock,
 999                                 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1000                         pr_err("sock_ops->getname() failed.\n");
1001                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1002                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1003                         goto new_sess_out;
1004                 }
1005                 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1006                 conn->login_port = ntohs(sock_in.sin_port);
1007
1008                 if (conn->sock->ops->getname(conn->sock,
1009                                 (struct sockaddr *)&sock_in, &err, 0) < 0) {
1010                         pr_err("sock_ops->getname() failed.\n");
1011                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1012                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1013                         goto new_sess_out;
1014                 }
1015                 sprintf(conn->local_ip, "%pI4", &sock_in.sin_addr.s_addr);
1016                 conn->local_port = ntohs(sock_in.sin_port);
1017         }
1018
1019         conn->network_transport = np->np_network_transport;
1020
1021         pr_debug("Received iSCSI login request from %s on %s Network"
1022                         " Portal %s:%hu\n", conn->login_ip,
1023                 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1024                         conn->local_ip, conn->local_port);
1025
1026         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1027         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1028
1029         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1030                         pdu->min_version) < 0)
1031                 goto new_sess_out;
1032
1033         zero_tsih = (pdu->tsih == 0x0000);
1034         if (zero_tsih) {
1035                 /*
1036                  * This is the leading connection of a new session.
1037                  * We wait until after authentication to check for
1038                  * session reinstatement.
1039                  */
1040                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1041                         goto new_sess_out;
1042         } else {
1043                 /*
1044                  * Add a new connection to an existing session.
1045                  * We check for a non-existant session in
1046                  * iscsi_login_non_zero_tsih_s2() below based
1047                  * on ISID/TSIH, but wait until after authentication
1048                  * to check for connection reinstatement, etc.
1049                  */
1050                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1051                         goto new_sess_out;
1052         }
1053
1054         /*
1055          * This will process the first login request, and call
1056          * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1057          */
1058         login = iscsi_target_init_negotiation(np, conn, buffer);
1059         if (!login) {
1060                 tpg = conn->tpg;
1061                 goto new_sess_out;
1062         }
1063
1064         tpg = conn->tpg;
1065         if (!tpg) {
1066                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1067                 goto new_sess_out;
1068         }
1069
1070         if (zero_tsih) {
1071                 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1072                         iscsi_target_nego_release(login, conn);
1073                         goto new_sess_out;
1074                 }
1075         } else {
1076                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1077                         iscsi_target_nego_release(login, conn);
1078                         goto old_sess_out;
1079                 }
1080         }
1081
1082         if (iscsi_target_start_negotiation(login, conn) < 0)
1083                 goto new_sess_out;
1084
1085         if (!conn->sess) {
1086                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1087                 goto new_sess_out;
1088         }
1089
1090         iscsi_stop_login_thread_timer(np);
1091
1092         if (signal_pending(current))
1093                 goto new_sess_out;
1094
1095         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1096
1097         if (ret < 0)
1098                 goto new_sess_out;
1099
1100         iscsit_deaccess_np(np, tpg);
1101         tpg = NULL;
1102         /* Get another socket */
1103         return 1;
1104
1105 new_sess_out:
1106         pr_err("iSCSI Login negotiation failed.\n");
1107         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1108                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1109         if (!zero_tsih || !conn->sess)
1110                 goto old_sess_out;
1111         if (conn->sess->se_sess)
1112                 transport_free_session(conn->sess->se_sess);
1113         if (conn->sess->session_index != 0) {
1114                 spin_lock_bh(&sess_idr_lock);
1115                 idr_remove(&sess_idr, conn->sess->session_index);
1116                 spin_unlock_bh(&sess_idr_lock);
1117         }
1118         kfree(conn->sess->sess_ops);
1119         kfree(conn->sess);
1120 old_sess_out:
1121         iscsi_stop_login_thread_timer(np);
1122         /*
1123          * If login negotiation fails check if the Time2Retain timer
1124          * needs to be restarted.
1125          */
1126         if (!zero_tsih && conn->sess) {
1127                 spin_lock_bh(&conn->sess->conn_lock);
1128                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1129                         struct se_portal_group *se_tpg =
1130                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1131
1132                         atomic_set(&conn->sess->session_continuation, 0);
1133                         spin_unlock_bh(&conn->sess->conn_lock);
1134                         spin_lock_bh(&se_tpg->session_lock);
1135                         iscsit_start_time2retain_handler(conn->sess);
1136                         spin_unlock_bh(&se_tpg->session_lock);
1137                 } else
1138                         spin_unlock_bh(&conn->sess->conn_lock);
1139                 iscsit_dec_session_usage_count(conn->sess);
1140         }
1141
1142         if (!IS_ERR(conn->conn_rx_hash.tfm))
1143                 crypto_free_hash(conn->conn_rx_hash.tfm);
1144         if (!IS_ERR(conn->conn_tx_hash.tfm))
1145                 crypto_free_hash(conn->conn_tx_hash.tfm);
1146
1147         if (conn->conn_cpumask)
1148                 free_cpumask_var(conn->conn_cpumask);
1149
1150         kfree(conn->conn_ops);
1151
1152         if (conn->param_list) {
1153                 iscsi_release_param_list(conn->param_list);
1154                 conn->param_list = NULL;
1155         }
1156         if (conn->sock)
1157                 sock_release(conn->sock);
1158         kfree(conn);
1159
1160         if (tpg) {
1161                 iscsit_deaccess_np(np, tpg);
1162                 tpg = NULL;
1163         }
1164
1165 out:
1166         stop = kthread_should_stop();
1167         if (!stop && signal_pending(current)) {
1168                 spin_lock_bh(&np->np_thread_lock);
1169                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1170                 spin_unlock_bh(&np->np_thread_lock);
1171         }
1172         /* Wait for another socket.. */
1173         if (!stop)
1174                 return 1;
1175
1176         iscsi_stop_login_thread_timer(np);
1177         spin_lock_bh(&np->np_thread_lock);
1178         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1179         spin_unlock_bh(&np->np_thread_lock);
1180         return 0;
1181 }
1182
1183 int iscsi_target_login_thread(void *arg)
1184 {
1185         struct iscsi_np *np = arg;
1186         int ret;
1187
1188         allow_signal(SIGINT);
1189
1190         while (!kthread_should_stop()) {
1191                 ret = __iscsi_target_login_thread(np);
1192                 /*
1193                  * We break and exit here unless another sock_accept() call
1194                  * is expected.
1195                  */
1196                 if (ret != 1)
1197                         break;
1198         }
1199
1200         return 0;
1201 }