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_LIST_HEAD(&conn->conn_list);
  48         INIT_LIST_HEAD(&conn->conn_cmd_list);
  49         INIT_LIST_HEAD(&conn->immed_queue_list);
  50         INIT_LIST_HEAD(&conn->response_queue_list);
  51         init_completion(&conn->conn_post_wait_comp);
  52         init_completion(&conn->conn_wait_comp);
  53         init_completion(&conn->conn_wait_rcfr_comp);
  54         init_completion(&conn->conn_waiting_on_uc_comp);
  55         init_completion(&conn->conn_logout_comp);
  56         init_completion(&conn->rx_half_close_comp);
  57         init_completion(&conn->tx_half_close_comp);
  58         spin_lock_init(&conn->cmd_lock);
  59         spin_lock_init(&conn->conn_usage_lock);
  60         spin_lock_init(&conn->immed_queue_lock);
  61         spin_lock_init(&conn->nopin_timer_lock);
  62         spin_lock_init(&conn->response_queue_lock);
  63         spin_lock_init(&conn->state_lock);
  64
  65         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  66                 pr_err("Unable to allocate conn->conn_cpumask\n");
  67                 return -ENOMEM;
  68         }
  69
  70         return 0;
  71 }
  72
  73 /*
  74  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  75  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  76  */
  77 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  78 {
  79         /*
  80          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  81          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  82          * to software 1x8 byte slicing from crc32c.ko
  83          */
  84         conn->conn_rx_hash.flags = 0;
  85         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  86                                                 CRYPTO_ALG_ASYNC);
  87         if (IS_ERR(conn->conn_rx_hash.tfm)) {
  88                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
  89                 return -ENOMEM;
  90         }
  91
  92         conn->conn_tx_hash.flags = 0;
  93         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  94                                                 CRYPTO_ALG_ASYNC);
  95         if (IS_ERR(conn->conn_tx_hash.tfm)) {
  96                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
  97                 crypto_free_hash(conn->conn_rx_hash.tfm);
  98                 return -ENOMEM;
  99         }
 100
 101         return 0;
 102 }
 103
 104 static int iscsi_login_check_initiator_version(
 105         struct iscsi_conn *conn,
 106         u8 version_max,
 107         u8 version_min)
 108 {
 109         if ((version_max != 0x00) || (version_min != 0x00)) {
 110                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 111                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 112                         version_min, version_max);
 113                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 114                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 115                 return -1;
 116         }
 117
 118         return 0;
 119 }
 120
 121 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 122 {
 123         int sessiontype;
 124         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 125         struct iscsi_portal_group *tpg = conn->tpg;
 126         struct iscsi_session *sess = NULL, *sess_p = NULL;
 127         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 128         struct se_session *se_sess, *se_sess_tmp;
 129
 130         initiatorname_param = iscsi_find_param_from_key(
 131                         INITIATORNAME, conn->param_list);
 132         if (!initiatorname_param)
 133                 return -1;
 134
 135         sessiontype_param = iscsi_find_param_from_key(
 136                         SESSIONTYPE, conn->param_list);
 137         if (!sessiontype_param)
 138                 return -1;
 139
 140         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 141
 142         spin_lock_bh(&se_tpg->session_lock);
 143         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 144                         sess_list) {
 145
 146                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 147                 spin_lock(&sess_p->conn_lock);
 148                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 149                     atomic_read(&sess_p->session_logout) ||
 150                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 151                         spin_unlock(&sess_p->conn_lock);
 152                         continue;
 153                 }
 154                 if (!memcmp((void *)sess_p->isid, (void *)conn->sess->isid, 6) &&
 155                    (!strcmp((void *)sess_p->sess_ops->InitiatorName,
 156                             (void *)initiatorname_param->value) &&
 157                    (sess_p->sess_ops->SessionType == sessiontype))) {
 158                         atomic_set(&sess_p->session_reinstatement, 1);
 159                         spin_unlock(&sess_p->conn_lock);
 160                         iscsit_inc_session_usage_count(sess_p);
 161                         iscsit_stop_time2retain_timer(sess_p);
 162                         sess = sess_p;
 163                         break;
 164                 }
 165                 spin_unlock(&sess_p->conn_lock);
 166         }
 167         spin_unlock_bh(&se_tpg->session_lock);
 168         /*
 169          * If the Time2Retain handler has expired, the session is already gone.
 170          */
 171         if (!sess)
 172                 return 0;
 173
 174         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 175                 " preforming session reinstatement.\n", (sessiontype) ?
 176                 "Discovery" : "Normal", sess->sid,
 177                 sess->sess_ops->InitiatorName);
 178
 179         spin_lock_bh(&sess->conn_lock);
 180         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 181                 spin_unlock_bh(&sess->conn_lock);
 182                 iscsit_dec_session_usage_count(sess);
 183                 return iscsit_close_session(sess);
 184         }
 185         spin_unlock_bh(&sess->conn_lock);
 186
 187         iscsit_stop_session(sess, 1, 1);
 188         iscsit_dec_session_usage_count(sess);
 189
 190         return iscsit_close_session(sess);
 191 }
 192
 193 static void iscsi_login_set_conn_values(
 194         struct iscsi_session *sess,
 195         struct iscsi_conn *conn,
 196         u16 cid)
 197 {
 198         conn->sess              = sess;
 199         conn->cid               = 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
 222         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 223         if (!sess) {
 224                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 225                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 226                 pr_err("Could not allocate memory for session\n");
 227                 return -1;
 228         }
 229
 230         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 231         sess->init_task_tag     = pdu->itt;
 232         memcpy((void *)&sess->isid, (void *)pdu->isid, 6);
 233         sess->exp_cmd_sn        = pdu->cmdsn;
 234         INIT_LIST_HEAD(&sess->sess_conn_list);
 235         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 236         INIT_LIST_HEAD(&sess->cr_active_list);
 237         INIT_LIST_HEAD(&sess->cr_inactive_list);
 238         init_completion(&sess->async_msg_comp);
 239         init_completion(&sess->reinstatement_comp);
 240         init_completion(&sess->session_wait_comp);
 241         init_completion(&sess->session_waiting_on_uc_comp);
 242         mutex_init(&sess->cmdsn_mutex);
 243         spin_lock_init(&sess->conn_lock);
 244         spin_lock_init(&sess->cr_a_lock);
 245         spin_lock_init(&sess->cr_i_lock);
 246         spin_lock_init(&sess->session_usage_lock);
 247         spin_lock_init(&sess->ttt_lock);
 248
 249         if (!idr_pre_get(&sess_idr, GFP_KERNEL)) {
 250                 pr_err("idr_pre_get() for sess_idr failed\n");
 251                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 252                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 253                 return -1;
 254         }
 255         spin_lock(&sess_idr_lock);
 256         idr_get_new(&sess_idr, NULL, &sess->session_index);
 257         spin_unlock(&sess_idr_lock);
 258
 259         sess->creation_time = get_jiffies_64();
 260         spin_lock_init(&sess->session_stats_lock);
 261         /*
 262          * The FFP CmdSN window values will be allocated from the TPG's
 263          * Initiator Node's ACL once the login has been successfully completed.
 264          */
 265         sess->max_cmd_sn        = pdu->cmdsn;
 266
 267         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 268         if (!sess->sess_ops) {
 269                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 270                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 271                 pr_err("Unable to allocate memory for"
 272                                 " struct iscsi_sess_ops.\n");
 273                 return -1;
 274         }
 275
 276         sess->se_sess = transport_init_session();
 277         if (!sess->se_sess) {
 278                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 279                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 280                 return -1;
 281         }
 282
 283         return 0;
 284 }
 285
 286 static int iscsi_login_zero_tsih_s2(
 287         struct iscsi_conn *conn)
 288 {
 289         struct iscsi_node_attrib *na;
 290         struct iscsi_session *sess = conn->sess;
 291         unsigned char buf[32];
 292
 293         sess->tpg = conn->tpg;
 294
 295         /*
 296          * Assign a new TPG Session Handle.  Note this is protected with
 297          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 298          */
 299         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 300         if (!sess->tsih)
 301                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 302
 303         /*
 304          * Create the default params from user defined values..
 305          */
 306         if (iscsi_copy_param_list(&conn->param_list,
 307                                 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
 308                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 309                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 310                 return -1;
 311         }
 312
 313         iscsi_set_keys_to_negotiate(0, conn->param_list);
 314
 315         if (sess->sess_ops->SessionType)
 316                 return iscsi_set_keys_irrelevant_for_discovery(
 317                                 conn->param_list);
 318
 319         na = iscsit_tpg_get_node_attrib(sess);
 320
 321         /*
 322          * Need to send TargetPortalGroupTag back in first login response
 323          * on any iSCSI connection where the Initiator provides TargetName.
 324          * See 5.3.1.  Login Phase Start
 325          *
 326          * In our case, we have already located the struct iscsi_tiqn at this point.
 327          */
 328         memset(buf, 0, 32);
 329         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 330         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 331                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 332                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 333                 return -1;
 334         }
 335
 336         /*
 337          * Workaround for Initiators that have broken connection recovery logic.
 338          *
 339          * "We would really like to get rid of this." Linux-iSCSI.org team
 340          */
 341         memset(buf, 0, 32);
 342         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 343         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 344                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 345                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 346                 return -1;
 347         }
 348
 349         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 350                 return -1;
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 357  * The Initiator node will be able to enable FIM by proposing them itself.
 358  */
 359 int iscsi_login_disable_FIM_keys(
 360         struct iscsi_param_list *param_list,
 361         struct iscsi_conn *conn)
 362 {
 363         struct iscsi_param *param;
 364
 365         param = iscsi_find_param_from_key("OFMarker", param_list);
 366         if (!param) {
 367                 pr_err("iscsi_find_param_from_key() for"
 368                                 " OFMarker failed\n");
 369                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 370                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 371                 return -1;
 372         }
 373         param->state &= ~PSTATE_NEGOTIATE;
 374
 375         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 376         if (!param) {
 377                 pr_err("iscsi_find_param_from_key() for"
 378                                 " IFMarker failed\n");
 379                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 380                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 381                 return -1;
 382         }
 383         param->state &= ~PSTATE_NEGOTIATE;
 384
 385         param = iscsi_find_param_from_key("IFMarker", param_list);
 386         if (!param) {
 387                 pr_err("iscsi_find_param_from_key() for"
 388                                 " IFMarker failed\n");
 389                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 390                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 391                 return -1;
 392         }
 393         param->state &= ~PSTATE_NEGOTIATE;
 394
 395         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 396         if (!param) {
 397                 pr_err("iscsi_find_param_from_key() for"
 398                                 " IFMarker failed\n");
 399                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 400                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 401                 return -1;
 402         }
 403         param->state &= ~PSTATE_NEGOTIATE;
 404
 405         return 0;
 406 }
 407
 408 static int iscsi_login_non_zero_tsih_s1(
 409         struct iscsi_conn *conn,
 410         unsigned char *buf)
 411 {
 412         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 413
 414         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 415         return 0;
 416 }
 417
 418 /*
 419  *      Add a new connection to an existing session.
 420  */
 421 static int iscsi_login_non_zero_tsih_s2(
 422         struct iscsi_conn *conn,
 423         unsigned char *buf)
 424 {
 425         struct iscsi_portal_group *tpg = conn->tpg;
 426         struct iscsi_session *sess = NULL, *sess_p = NULL;
 427         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 428         struct se_session *se_sess, *se_sess_tmp;
 429         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 430
 431         spin_lock_bh(&se_tpg->session_lock);
 432         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 433                         sess_list) {
 434
 435                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 436                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 437                     atomic_read(&sess_p->session_logout) ||
 438                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 439                         continue;
 440                 if (!memcmp((const void *)sess_p->isid,
 441                      (const void *)pdu->isid, 6) &&
 442                      (sess_p->tsih == pdu->tsih)) {
 443                         iscsit_inc_session_usage_count(sess_p);
 444                         iscsit_stop_time2retain_timer(sess_p);
 445                         sess = sess_p;
 446                         break;
 447                 }
 448         }
 449         spin_unlock_bh(&se_tpg->session_lock);
 450
 451         /*
 452          * If the Time2Retain handler has expired, the session is already gone.
 453          */
 454         if (!sess) {
 455                 pr_err("Initiator attempting to add a connection to"
 456                         " a non-existent session, rejecting iSCSI Login.\n");
 457                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 458                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 459                 return -1;
 460         }
 461
 462         /*
 463          * Stop the Time2Retain timer if this is a failed session, we restart
 464          * the timer if the login is not successful.
 465          */
 466         spin_lock_bh(&sess->conn_lock);
 467         if (sess->session_state == TARG_SESS_STATE_FAILED)
 468                 atomic_set(&sess->session_continuation, 1);
 469         spin_unlock_bh(&sess->conn_lock);
 470
 471         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 472
 473         if (iscsi_copy_param_list(&conn->param_list,
 474                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 475                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 476                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 477                 return -1;
 478         }
 479
 480         iscsi_set_keys_to_negotiate(0, conn->param_list);
 481         /*
 482          * Need to send TargetPortalGroupTag back in first login response
 483          * on any iSCSI connection where the Initiator provides TargetName.
 484          * See 5.3.1.  Login Phase Start
 485          *
 486          * In our case, we have already located the struct iscsi_tiqn at this point.
 487          */
 488         memset(buf, 0, 32);
 489         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 490         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 491                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 492                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 493                 return -1;
 494         }
 495
 496         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 497 }
 498
 499 int iscsi_login_post_auth_non_zero_tsih(
 500         struct iscsi_conn *conn,
 501         u16 cid,
 502         u32 exp_statsn)
 503 {
 504         struct iscsi_conn *conn_ptr = NULL;
 505         struct iscsi_conn_recovery *cr = NULL;
 506         struct iscsi_session *sess = conn->sess;
 507
 508         /*
 509          * By following item 5 in the login table,  if we have found
 510          * an existing ISID and a valid/existing TSIH and an existing
 511          * CID we do connection reinstatement.  Currently we dont not
 512          * support it so we send back an non-zero status class to the
 513          * initiator and release the new connection.
 514          */
 515         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 516         if ((conn_ptr)) {
 517                 pr_err("Connection exists with CID %hu for %s,"
 518                         " performing connection reinstatement.\n",
 519                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 520
 521                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 522                 iscsit_dec_conn_usage_count(conn_ptr);
 523         }
 524
 525         /*
 526          * Check for any connection recovery entires containing CID.
 527          * We use the original ExpStatSN sent in the first login request
 528          * to acknowledge commands for the failed connection.
 529          *
 530          * Also note that an explict logout may have already been sent,
 531          * but the response may not be sent due to additional connection
 532          * loss.
 533          */
 534         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 535                 cr = iscsit_get_inactive_connection_recovery_entry(
 536                                 sess, cid);
 537                 if ((cr)) {
 538                         pr_debug("Performing implicit logout"
 539                                 " for connection recovery on CID: %hu\n",
 540                                         conn->cid);
 541                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 542                 }
 543         }
 544
 545         /*
 546          * Else we follow item 4 from the login table in that we have
 547          * found an existing ISID and a valid/existing TSIH and a new
 548          * CID we go ahead and continue to add a new connection to the
 549          * session.
 550          */
 551         pr_debug("Adding CID %hu to existing session for %s.\n",
 552                         cid, sess->sess_ops->InitiatorName);
 553
 554         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 555                 pr_err("Adding additional connection to this session"
 556                         " would exceed MaxConnections %d, login failed.\n",
 557                                 sess->sess_ops->MaxConnections);
 558                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 559                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 560                 return -1;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 567 {
 568         struct iscsi_session *sess = conn->sess;
 569
 570         if (!sess->sess_ops->SessionType)
 571                 iscsit_start_nopin_timer(conn);
 572 }
 573
 574 static int iscsi_post_login_handler(
 575         struct iscsi_np *np,
 576         struct iscsi_conn *conn,
 577         u8 zero_tsih)
 578 {
 579         int stop_timer = 0;
 580         struct iscsi_session *sess = conn->sess;
 581         struct se_session *se_sess = sess->se_sess;
 582         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 583         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 584         struct iscsi_thread_set *ts;
 585
 586         iscsit_inc_conn_usage_count(conn);
 587
 588         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 589                         ISCSI_LOGIN_STATUS_ACCEPT);
 590
 591         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 592         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 593
 594         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 595         iscsit_set_sync_and_steering_values(conn);
 596         /*
 597          * SCSI Initiator -> SCSI Target Port Mapping
 598          */
 599         ts = iscsi_get_thread_set();
 600         if (!zero_tsih) {
 601                 iscsi_set_session_parameters(sess->sess_ops,
 602                                 conn->param_list, 0);
 603                 iscsi_release_param_list(conn->param_list);
 604                 conn->param_list = NULL;
 605
 606                 spin_lock_bh(&sess->conn_lock);
 607                 atomic_set(&sess->session_continuation, 0);
 608                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 609                         pr_debug("Moving to"
 610                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 611                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 612                         stop_timer = 1;
 613                 }
 614
 615                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 616                         " %s:%hu,%hu\n", conn->cid, conn->login_ip, np->np_ip,
 617                                 np->np_port, tpg->tpgt);
 618
 619                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 620                 atomic_inc(&sess->nconn);
 621                 pr_debug("Incremented iSCSI Connection count to %hu"
 622                         " from node: %s\n", atomic_read(&sess->nconn),
 623                         sess->sess_ops->InitiatorName);
 624                 spin_unlock_bh(&sess->conn_lock);
 625
 626                 iscsi_post_login_start_timers(conn);
 627                 iscsi_activate_thread_set(conn, ts);
 628                 /*
 629                  * Determine CPU mask to ensure connection's RX and TX kthreads
 630                  * are scheduled on the same CPU.
 631                  */
 632                 iscsit_thread_get_cpumask(conn);
 633                 conn->conn_rx_reset_cpumask = 1;
 634                 conn->conn_tx_reset_cpumask = 1;
 635
 636                 iscsit_dec_conn_usage_count(conn);
 637                 if (stop_timer) {
 638                         spin_lock_bh(&se_tpg->session_lock);
 639                         iscsit_stop_time2retain_timer(sess);
 640                         spin_unlock_bh(&se_tpg->session_lock);
 641                 }
 642                 iscsit_dec_session_usage_count(sess);
 643                 return 0;
 644         }
 645
 646         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 647         iscsi_release_param_list(conn->param_list);
 648         conn->param_list = NULL;
 649
 650         iscsit_determine_maxcmdsn(sess);
 651
 652         spin_lock_bh(&se_tpg->session_lock);
 653         __transport_register_session(&sess->tpg->tpg_se_tpg,
 654                         se_sess->se_node_acl, se_sess, (void *)sess);
 655         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 656         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 657
 658         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 659                 conn->cid, conn->login_ip, np->np_ip, np->np_port, tpg->tpgt);
 660
 661         spin_lock_bh(&sess->conn_lock);
 662         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 663         atomic_inc(&sess->nconn);
 664         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 665                 " %s\n", atomic_read(&sess->nconn),
 666                 sess->sess_ops->InitiatorName);
 667         spin_unlock_bh(&sess->conn_lock);
 668
 669         sess->sid = tpg->sid++;
 670         if (!sess->sid)
 671                 sess->sid = tpg->sid++;
 672         pr_debug("Established iSCSI session from node: %s\n",
 673                         sess->sess_ops->InitiatorName);
 674
 675         tpg->nsessions++;
 676         if (tpg->tpg_tiqn)
 677                 tpg->tpg_tiqn->tiqn_nsessions++;
 678
 679         pr_debug("Incremented number of active iSCSI sessions to %u on"
 680                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 681         spin_unlock_bh(&se_tpg->session_lock);
 682
 683         iscsi_post_login_start_timers(conn);
 684         iscsi_activate_thread_set(conn, ts);
 685         /*
 686          * Determine CPU mask to ensure connection's RX and TX kthreads
 687          * are scheduled on the same CPU.
 688          */
 689         iscsit_thread_get_cpumask(conn);
 690         conn->conn_rx_reset_cpumask = 1;
 691         conn->conn_tx_reset_cpumask = 1;
 692
 693         iscsit_dec_conn_usage_count(conn);
 694
 695         return 0;
 696 }
 697
 698 static void iscsi_handle_login_thread_timeout(unsigned long data)
 699 {
 700         struct iscsi_np *np = (struct iscsi_np *) data;
 701
 702         spin_lock_bh(&np->np_thread_lock);
 703         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 704                         np->np_ip, np->np_port);
 705
 706         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 707                 spin_unlock_bh(&np->np_thread_lock);
 708                 return;
 709         }
 710
 711         if (np->np_thread)
 712                 send_sig(SIGINT, np->np_thread, 1);
 713
 714         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 715         spin_unlock_bh(&np->np_thread_lock);
 716 }
 717
 718 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 719 {
 720         /*
 721          * This used the TA_LOGIN_TIMEOUT constant because at this
 722          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 723          */
 724         spin_lock_bh(&np->np_thread_lock);
 725         init_timer(&np->np_login_timer);
 726         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 727         np->np_login_timer.data = (unsigned long)np;
 728         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 729         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 730         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 731         add_timer(&np->np_login_timer);
 732
 733         pr_debug("Added timeout timer to iSCSI login request for"
 734                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 735         spin_unlock_bh(&np->np_thread_lock);
 736 }
 737
 738 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 739 {
 740         spin_lock_bh(&np->np_thread_lock);
 741         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 742                 spin_unlock_bh(&np->np_thread_lock);
 743                 return;
 744         }
 745         np->np_login_timer_flags |= ISCSI_TF_STOP;
 746         spin_unlock_bh(&np->np_thread_lock);
 747
 748         del_timer_sync(&np->np_login_timer);
 749
 750         spin_lock_bh(&np->np_thread_lock);
 751         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 752         spin_unlock_bh(&np->np_thread_lock);
 753 }
 754
 755 int iscsi_target_setup_login_socket(
 756         struct iscsi_np *np,
 757         struct __kernel_sockaddr_storage *sockaddr)
 758 {
 759         struct socket *sock;
 760         int backlog = 5, ret, opt = 0, len;
 761
 762         switch (np->np_network_transport) {
 763         case ISCSI_TCP:
 764                 np->np_ip_proto = IPPROTO_TCP;
 765                 np->np_sock_type = SOCK_STREAM;
 766                 break;
 767         case ISCSI_SCTP_TCP:
 768                 np->np_ip_proto = IPPROTO_SCTP;
 769                 np->np_sock_type = SOCK_STREAM;
 770                 break;
 771         case ISCSI_SCTP_UDP:
 772                 np->np_ip_proto = IPPROTO_SCTP;
 773                 np->np_sock_type = SOCK_SEQPACKET;
 774                 break;
 775         case ISCSI_IWARP_TCP:
 776         case ISCSI_IWARP_SCTP:
 777         case ISCSI_INFINIBAND:
 778         default:
 779                 pr_err("Unsupported network_transport: %d\n",
 780                                 np->np_network_transport);
 781                 return -EINVAL;
 782         }
 783
 784         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 785                         np->np_ip_proto, &sock);
 786         if (ret < 0) {
 787                 pr_err("sock_create() failed.\n");
 788                 return ret;
 789         }
 790         np->np_socket = sock;
 791         /*
 792          * The SCTP stack needs struct socket->file.
 793          */
 794         if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
 795             (np->np_network_transport == ISCSI_SCTP_UDP)) {
 796                 if (!sock->file) {
 797                         sock->file = kzalloc(sizeof(struct file), GFP_KERNEL);
 798                         if (!sock->file) {
 799                                 pr_err("Unable to allocate struct"
 800                                                 " file for SCTP\n");
 801                                 ret = -ENOMEM;
 802                                 goto fail;
 803                         }
 804                         np->np_flags |= NPF_SCTP_STRUCT_FILE;
 805                 }
 806         }
 807         /*
 808          * Setup the np->np_sockaddr from the passed sockaddr setup
 809          * in iscsi_target_configfs.c code..
 810          */
 811         memcpy((void *)&np->np_sockaddr, (void *)sockaddr,
 812                         sizeof(struct __kernel_sockaddr_storage));
 813
 814         if (sockaddr->ss_family == AF_INET6)
 815                 len = sizeof(struct sockaddr_in6);
 816         else
 817                 len = sizeof(struct sockaddr_in);
 818         /*
 819          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 820          */
 821         opt = 1;
 822         if (np->np_network_transport == ISCSI_TCP) {
 823                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 824                                 (char *)&opt, sizeof(opt));
 825                 if (ret < 0) {
 826                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 827                                 " failed: %d\n", ret);
 828                         goto fail;
 829                 }
 830         }
 831
 832         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 833                         (char *)&opt, sizeof(opt));
 834         if (ret < 0) {
 835                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 836                         " failed\n");
 837                 goto fail;
 838         }
 839
 840         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 841         if (ret < 0) {
 842                 pr_err("kernel_bind() failed: %d\n", ret);
 843                 goto fail;
 844         }
 845
 846         ret = kernel_listen(sock, backlog);
 847         if (ret != 0) {
 848                 pr_err("kernel_listen() failed: %d\n", ret);
 849                 goto fail;
 850         }
 851
 852         return 0;
 853
 854 fail:
 855         np->np_socket = NULL;
 856         if (sock) {
 857                 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 858                         kfree(sock->file);
 859                         sock->file = NULL;
 860                 }
 861
 862                 sock_release(sock);
 863         }
 864         return ret;
 865 }
 866
 867 static int __iscsi_target_login_thread(struct iscsi_np *np)
 868 {
 869         u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
 870         int err, ret = 0, ip_proto, sock_type, set_sctp_conn_flag, stop;
 871         struct iscsi_conn *conn = NULL;
 872         struct iscsi_login *login;
 873         struct iscsi_portal_group *tpg = NULL;
 874         struct socket *new_sock, *sock;
 875         struct kvec iov;
 876         struct iscsi_login_req *pdu;
 877         struct sockaddr_in sock_in;
 878         struct sockaddr_in6 sock_in6;
 879
 880         flush_signals(current);
 881         set_sctp_conn_flag = 0;
 882         sock = np->np_socket;
 883         ip_proto = np->np_ip_proto;
 884         sock_type = np->np_sock_type;
 885
 886         spin_lock_bh(&np->np_thread_lock);
 887         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 888                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 889                 complete(&np->np_restart_comp);
 890         } else {
 891                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 892         }
 893         spin_unlock_bh(&np->np_thread_lock);
 894
 895         if (kernel_accept(sock, &new_sock, 0) < 0) {
 896                 spin_lock_bh(&np->np_thread_lock);
 897                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 898                         spin_unlock_bh(&np->np_thread_lock);
 899                         complete(&np->np_restart_comp);
 900                         /* Get another socket */
 901                         return 1;
 902                 }
 903                 spin_unlock_bh(&np->np_thread_lock);
 904                 goto out;
 905         }
 906         /*
 907          * The SCTP stack needs struct socket->file.
 908          */
 909         if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
 910             (np->np_network_transport == ISCSI_SCTP_UDP)) {
 911                 if (!new_sock->file) {
 912                         new_sock->file = kzalloc(
 913                                         sizeof(struct file), GFP_KERNEL);
 914                         if (!new_sock->file) {
 915                                 pr_err("Unable to allocate struct"
 916                                                 " file for SCTP\n");
 917                                 sock_release(new_sock);
 918                                 /* Get another socket */
 919                                 return 1;
 920                         }
 921                         set_sctp_conn_flag = 1;
 922                 }
 923         }
 924
 925         iscsi_start_login_thread_timer(np);
 926
 927         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
 928         if (!conn) {
 929                 pr_err("Could not allocate memory for"
 930                         " new connection\n");
 931                 if (set_sctp_conn_flag) {
 932                         kfree(new_sock->file);
 933                         new_sock->file = NULL;
 934                 }
 935                 sock_release(new_sock);
 936                 /* Get another socket */
 937                 return 1;
 938         }
 939
 940         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
 941         conn->conn_state = TARG_CONN_STATE_FREE;
 942         conn->sock = new_sock;
 943
 944         if (set_sctp_conn_flag)
 945                 conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE;
 946
 947         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
 948         conn->conn_state = TARG_CONN_STATE_XPT_UP;
 949
 950         /*
 951          * Allocate conn->conn_ops early as a failure calling
 952          * iscsit_tx_login_rsp() below will call tx_data().
 953          */
 954         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
 955         if (!conn->conn_ops) {
 956                 pr_err("Unable to allocate memory for"
 957                         " struct iscsi_conn_ops.\n");
 958                 goto new_sess_out;
 959         }
 960         /*
 961          * Perform the remaining iSCSI connection initialization items..
 962          */
 963         if (iscsi_login_init_conn(conn) < 0)
 964                 goto new_sess_out;
 965
 966         memset(buffer, 0, ISCSI_HDR_LEN);
 967         memset(&iov, 0, sizeof(struct kvec));
 968         iov.iov_base    = buffer;
 969         iov.iov_len     = ISCSI_HDR_LEN;
 970
 971         if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
 972                 pr_err("rx_data() returned an error.\n");
 973                 goto new_sess_out;
 974         }
 975
 976         iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
 977         if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
 978                 pr_err("First opcode is not login request,"
 979                         " failing login request.\n");
 980                 goto new_sess_out;
 981         }
 982
 983         pdu                     = (struct iscsi_login_req *) buffer;
 984         pdu->cid                = be16_to_cpu(pdu->cid);
 985         pdu->tsih               = be16_to_cpu(pdu->tsih);
 986         pdu->itt                = be32_to_cpu(pdu->itt);
 987         pdu->cmdsn              = be32_to_cpu(pdu->cmdsn);
 988         pdu->exp_statsn         = be32_to_cpu(pdu->exp_statsn);
 989         /*
 990          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
 991          * when Status-Class != 0.
 992         */
 993         conn->login_itt         = pdu->itt;
 994
 995         spin_lock_bh(&np->np_thread_lock);
 996         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 997                 spin_unlock_bh(&np->np_thread_lock);
 998                 pr_err("iSCSI Network Portal on %s:%hu currently not"
 999                         " active.\n", np->np_ip, np->np_port);
1000                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1001                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1002                 goto new_sess_out;
1003         }
1004         spin_unlock_bh(&np->np_thread_lock);
1005
1006         if (np->np_sockaddr.ss_family == AF_INET6) {
1007                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1008
1009                 if (conn->sock->ops->getname(conn->sock,
1010                                 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
1011                         pr_err("sock_ops->getname() failed.\n");
1012                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1013                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1014                         goto new_sess_out;
1015                 }
1016                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1017                                 &sock_in6.sin6_addr.in6_u);
1018                 conn->login_port = ntohs(sock_in6.sin6_port);
1019         } else {
1020                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1021
1022                 if (conn->sock->ops->getname(conn->sock,
1023                                 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1024                         pr_err("sock_ops->getname() failed.\n");
1025                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1026                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1027                         goto new_sess_out;
1028                 }
1029                 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1030                 conn->login_port = ntohs(sock_in.sin_port);
1031         }
1032
1033         conn->network_transport = np->np_network_transport;
1034
1035         pr_debug("Received iSCSI login request from %s on %s Network"
1036                         " Portal %s:%hu\n", conn->login_ip,
1037                 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1038                         np->np_ip, np->np_port);
1039
1040         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1041         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1042
1043         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1044                         pdu->min_version) < 0)
1045                 goto new_sess_out;
1046
1047         zero_tsih = (pdu->tsih == 0x0000);
1048         if ((zero_tsih)) {
1049                 /*
1050                  * This is the leading connection of a new session.
1051                  * We wait until after authentication to check for
1052                  * session reinstatement.
1053                  */
1054                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1055                         goto new_sess_out;
1056         } else {
1057                 /*
1058                  * Add a new connection to an existing session.
1059                  * We check for a non-existant session in
1060                  * iscsi_login_non_zero_tsih_s2() below based
1061                  * on ISID/TSIH, but wait until after authentication
1062                  * to check for connection reinstatement, etc.
1063                  */
1064                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1065                         goto new_sess_out;
1066         }
1067
1068         /*
1069          * This will process the first login request, and call
1070          * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1071          */
1072         login = iscsi_target_init_negotiation(np, conn, buffer);
1073         if (!login) {
1074                 tpg = conn->tpg;
1075                 goto new_sess_out;
1076         }
1077
1078         tpg = conn->tpg;
1079         if (!tpg) {
1080                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1081                 goto new_sess_out;
1082         }
1083
1084         if (zero_tsih) {
1085                 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1086                         iscsi_target_nego_release(login, conn);
1087                         goto new_sess_out;
1088                 }
1089         } else {
1090                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1091                         iscsi_target_nego_release(login, conn);
1092                         goto old_sess_out;
1093                 }
1094         }
1095
1096         if (iscsi_target_start_negotiation(login, conn) < 0)
1097                 goto new_sess_out;
1098
1099         if (!conn->sess) {
1100                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1101                 goto new_sess_out;
1102         }
1103
1104         iscsi_stop_login_thread_timer(np);
1105
1106         if (signal_pending(current))
1107                 goto new_sess_out;
1108
1109         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1110
1111         if (ret < 0)
1112                 goto new_sess_out;
1113
1114         iscsit_deaccess_np(np, tpg);
1115         tpg = NULL;
1116         /* Get another socket */
1117         return 1;
1118
1119 new_sess_out:
1120         pr_err("iSCSI Login negotiation failed.\n");
1121         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1122                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1123         if (!zero_tsih || !conn->sess)
1124                 goto old_sess_out;
1125         if (conn->sess->se_sess)
1126                 transport_free_session(conn->sess->se_sess);
1127         if (conn->sess->session_index != 0) {
1128                 spin_lock_bh(&sess_idr_lock);
1129                 idr_remove(&sess_idr, conn->sess->session_index);
1130                 spin_unlock_bh(&sess_idr_lock);
1131         }
1132         if (conn->sess->sess_ops)
1133                 kfree(conn->sess->sess_ops);
1134         if (conn->sess)
1135                 kfree(conn->sess);
1136 old_sess_out:
1137         iscsi_stop_login_thread_timer(np);
1138         /*
1139          * If login negotiation fails check if the Time2Retain timer
1140          * needs to be restarted.
1141          */
1142         if (!zero_tsih && conn->sess) {
1143                 spin_lock_bh(&conn->sess->conn_lock);
1144                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1145                         struct se_portal_group *se_tpg =
1146                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1147
1148                         atomic_set(&conn->sess->session_continuation, 0);
1149                         spin_unlock_bh(&conn->sess->conn_lock);
1150                         spin_lock_bh(&se_tpg->session_lock);
1151                         iscsit_start_time2retain_handler(conn->sess);
1152                         spin_unlock_bh(&se_tpg->session_lock);
1153                 } else
1154                         spin_unlock_bh(&conn->sess->conn_lock);
1155                 iscsit_dec_session_usage_count(conn->sess);
1156         }
1157
1158         if (!IS_ERR(conn->conn_rx_hash.tfm))
1159                 crypto_free_hash(conn->conn_rx_hash.tfm);
1160         if (!IS_ERR(conn->conn_tx_hash.tfm))
1161                 crypto_free_hash(conn->conn_tx_hash.tfm);
1162
1163         if (conn->conn_cpumask)
1164                 free_cpumask_var(conn->conn_cpumask);
1165
1166         kfree(conn->conn_ops);
1167
1168         if (conn->param_list) {
1169                 iscsi_release_param_list(conn->param_list);
1170                 conn->param_list = NULL;
1171         }
1172         if (conn->sock) {
1173                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
1174                         kfree(conn->sock->file);
1175                         conn->sock->file = NULL;
1176                 }
1177                 sock_release(conn->sock);
1178         }
1179         kfree(conn);
1180
1181         if (tpg) {
1182                 iscsit_deaccess_np(np, tpg);
1183                 tpg = NULL;
1184         }
1185
1186 out:
1187         stop = kthread_should_stop();
1188         if (!stop && signal_pending(current)) {
1189                 spin_lock_bh(&np->np_thread_lock);
1190                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1191                 spin_unlock_bh(&np->np_thread_lock);
1192         }
1193         /* Wait for another socket.. */
1194         if (!stop)
1195                 return 1;
1196
1197         iscsi_stop_login_thread_timer(np);
1198         spin_lock_bh(&np->np_thread_lock);
1199         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1200         spin_unlock_bh(&np->np_thread_lock);
1201         return 0;
1202 }
1203
1204 int iscsi_target_login_thread(void *arg)
1205 {
1206         struct iscsi_np *np = (struct iscsi_np *)arg;
1207         int ret;
1208
1209         allow_signal(SIGINT);
1210
1211         while (!kthread_should_stop()) {
1212                 ret = __iscsi_target_login_thread(np);
1213                 /*
1214                  * We break and exit here unless another sock_accept() call
1215                  * is expected.
1216                  */
1217                 if (ret != 1)
1218                         break;
1219         }
1220
1221         return 0;
1222 }