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 extern struct idr sess_idr;
  43 extern struct mutex auth_id_lock;
  44 extern spinlock_t sess_idr_lock;
  45
  46 static int iscsi_login_init_conn(struct iscsi_conn *conn)
  47 {
  48         INIT_LIST_HEAD(&conn->conn_list);
  49         INIT_LIST_HEAD(&conn->conn_cmd_list);
  50         INIT_LIST_HEAD(&conn->immed_queue_list);
  51         INIT_LIST_HEAD(&conn->response_queue_list);
  52         init_completion(&conn->conn_post_wait_comp);
  53         init_completion(&conn->conn_wait_comp);
  54         init_completion(&conn->conn_wait_rcfr_comp);
  55         init_completion(&conn->conn_waiting_on_uc_comp);
  56         init_completion(&conn->conn_logout_comp);
  57         init_completion(&conn->rx_half_close_comp);
  58         init_completion(&conn->tx_half_close_comp);
  59         spin_lock_init(&conn->cmd_lock);
  60         spin_lock_init(&conn->conn_usage_lock);
  61         spin_lock_init(&conn->immed_queue_lock);
  62         spin_lock_init(&conn->nopin_timer_lock);
  63         spin_lock_init(&conn->response_queue_lock);
  64         spin_lock_init(&conn->state_lock);
  65
  66         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  67                 pr_err("Unable to allocate conn->conn_cpumask\n");
  68                 return -ENOMEM;
  69         }
  70
  71         return 0;
  72 }
  73
  74 /*
  75  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  76  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  77  */
  78 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  79 {
  80         /*
  81          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  82          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  83          * to software 1x8 byte slicing from crc32c.ko
  84          */
  85         conn->conn_rx_hash.flags = 0;
  86         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  87                                                 CRYPTO_ALG_ASYNC);
  88         if (IS_ERR(conn->conn_rx_hash.tfm)) {
  89                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
  90                 return -ENOMEM;
  91         }
  92
  93         conn->conn_tx_hash.flags = 0;
  94         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
  95                                                 CRYPTO_ALG_ASYNC);
  96         if (IS_ERR(conn->conn_tx_hash.tfm)) {
  97                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
  98                 crypto_free_hash(conn->conn_rx_hash.tfm);
  99                 return -ENOMEM;
 100         }
 101
 102         return 0;
 103 }
 104
 105 static int iscsi_login_check_initiator_version(
 106         struct iscsi_conn *conn,
 107         u8 version_max,
 108         u8 version_min)
 109 {
 110         if ((version_max != 0x00) || (version_min != 0x00)) {
 111                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 112                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 113                         version_min, version_max);
 114                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 115                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 116                 return -1;
 117         }
 118
 119         return 0;
 120 }
 121
 122 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 123 {
 124         int sessiontype;
 125         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 126         struct iscsi_portal_group *tpg = conn->tpg;
 127         struct iscsi_session *sess = NULL, *sess_p = NULL;
 128         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 129         struct se_session *se_sess, *se_sess_tmp;
 130
 131         initiatorname_param = iscsi_find_param_from_key(
 132                         INITIATORNAME, conn->param_list);
 133         if (!initiatorname_param)
 134                 return -1;
 135
 136         sessiontype_param = iscsi_find_param_from_key(
 137                         SESSIONTYPE, conn->param_list);
 138         if (!sessiontype_param)
 139                 return -1;
 140
 141         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 142
 143         spin_lock_bh(&se_tpg->session_lock);
 144         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 145                         sess_list) {
 146
 147                 sess_p = se_sess->fabric_sess_ptr;
 148                 spin_lock(&sess_p->conn_lock);
 149                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 150                     atomic_read(&sess_p->session_logout) ||
 151                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 152                         spin_unlock(&sess_p->conn_lock);
 153                         continue;
 154                 }
 155                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 156                    (!strcmp(sess_p->sess_ops->InitiatorName,
 157                             initiatorname_param->value) &&
 158                    (sess_p->sess_ops->SessionType == sessiontype))) {
 159                         atomic_set(&sess_p->session_reinstatement, 1);
 160                         spin_unlock(&sess_p->conn_lock);
 161                         iscsit_inc_session_usage_count(sess_p);
 162                         iscsit_stop_time2retain_timer(sess_p);
 163                         sess = sess_p;
 164                         break;
 165                 }
 166                 spin_unlock(&sess_p->conn_lock);
 167         }
 168         spin_unlock_bh(&se_tpg->session_lock);
 169         /*
 170          * If the Time2Retain handler has expired, the session is already gone.
 171          */
 172         if (!sess)
 173                 return 0;
 174
 175         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 176                 " preforming session reinstatement.\n", (sessiontype) ?
 177                 "Discovery" : "Normal", sess->sid,
 178                 sess->sess_ops->InitiatorName);
 179
 180         spin_lock_bh(&sess->conn_lock);
 181         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 182                 spin_unlock_bh(&sess->conn_lock);
 183                 iscsit_dec_session_usage_count(sess);
 184                 target_put_session(sess->se_sess);
 185                 return 0;
 186         }
 187         spin_unlock_bh(&sess->conn_lock);
 188
 189         iscsit_stop_session(sess, 1, 1);
 190         iscsit_dec_session_usage_count(sess);
 191
 192         target_put_session(sess->se_sess);
 193         return 0;
 194 }
 195
 196 static void iscsi_login_set_conn_values(
 197         struct iscsi_session *sess,
 198         struct iscsi_conn *conn,
 199         u16 cid)
 200 {
 201         conn->sess              = sess;
 202         conn->cid               = cid;
 203         /*
 204          * Generate a random Status sequence number (statsn) for the new
 205          * iSCSI connection.
 206          */
 207         get_random_bytes(&conn->stat_sn, sizeof(u32));
 208
 209         mutex_lock(&auth_id_lock);
 210         conn->auth_id           = iscsit_global->auth_id++;
 211         mutex_unlock(&auth_id_lock);
 212 }
 213
 214 /*
 215  *      This is the leading connection of a new session,
 216  *      or session reinstatement.
 217  */
 218 static int iscsi_login_zero_tsih_s1(
 219         struct iscsi_conn *conn,
 220         unsigned char *buf)
 221 {
 222         struct iscsi_session *sess = NULL;
 223         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 224
 225         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 226         if (!sess) {
 227                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 228                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 229                 pr_err("Could not allocate memory for session\n");
 230                 return -ENOMEM;
 231         }
 232
 233         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 234         sess->init_task_tag     = pdu->itt;
 235         memcpy(&sess->isid, pdu->isid, 6);
 236         sess->exp_cmd_sn        = pdu->cmdsn;
 237         INIT_LIST_HEAD(&sess->sess_conn_list);
 238         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 239         INIT_LIST_HEAD(&sess->cr_active_list);
 240         INIT_LIST_HEAD(&sess->cr_inactive_list);
 241         init_completion(&sess->async_msg_comp);
 242         init_completion(&sess->reinstatement_comp);
 243         init_completion(&sess->session_wait_comp);
 244         init_completion(&sess->session_waiting_on_uc_comp);
 245         mutex_init(&sess->cmdsn_mutex);
 246         spin_lock_init(&sess->conn_lock);
 247         spin_lock_init(&sess->cr_a_lock);
 248         spin_lock_init(&sess->cr_i_lock);
 249         spin_lock_init(&sess->session_usage_lock);
 250         spin_lock_init(&sess->ttt_lock);
 251
 252         if (!idr_pre_get(&sess_idr, GFP_KERNEL)) {
 253                 pr_err("idr_pre_get() for sess_idr failed\n");
 254                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 255                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 256                 kfree(sess);
 257                 return -ENOMEM;
 258         }
 259         spin_lock(&sess_idr_lock);
 260         idr_get_new(&sess_idr, NULL, &sess->session_index);
 261         spin_unlock(&sess_idr_lock);
 262
 263         sess->creation_time = get_jiffies_64();
 264         spin_lock_init(&sess->session_stats_lock);
 265         /*
 266          * The FFP CmdSN window values will be allocated from the TPG's
 267          * Initiator Node's ACL once the login has been successfully completed.
 268          */
 269         sess->max_cmd_sn        = pdu->cmdsn;
 270
 271         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 272         if (!sess->sess_ops) {
 273                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 274                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 275                 pr_err("Unable to allocate memory for"
 276                                 " struct iscsi_sess_ops.\n");
 277                 kfree(sess);
 278                 return -ENOMEM;
 279         }
 280
 281         sess->se_sess = transport_init_session();
 282         if (IS_ERR(sess->se_sess)) {
 283                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 284                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 285                 kfree(sess);
 286                 return -ENOMEM;
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int iscsi_login_zero_tsih_s2(
 293         struct iscsi_conn *conn)
 294 {
 295         struct iscsi_node_attrib *na;
 296         struct iscsi_session *sess = conn->sess;
 297         unsigned char buf[32];
 298
 299         sess->tpg = conn->tpg;
 300
 301         /*
 302          * Assign a new TPG Session Handle.  Note this is protected with
 303          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 304          */
 305         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 306         if (!sess->tsih)
 307                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 308
 309         /*
 310          * Create the default params from user defined values..
 311          */
 312         if (iscsi_copy_param_list(&conn->param_list,
 313                                 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
 314                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 315                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 316                 return -1;
 317         }
 318
 319         iscsi_set_keys_to_negotiate(0, conn->param_list);
 320
 321         if (sess->sess_ops->SessionType)
 322                 return iscsi_set_keys_irrelevant_for_discovery(
 323                                 conn->param_list);
 324
 325         na = iscsit_tpg_get_node_attrib(sess);
 326
 327         /*
 328          * Need to send TargetPortalGroupTag back in first login response
 329          * on any iSCSI connection where the Initiator provides TargetName.
 330          * See 5.3.1.  Login Phase Start
 331          *
 332          * In our case, we have already located the struct iscsi_tiqn at this point.
 333          */
 334         memset(buf, 0, 32);
 335         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 336         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 337                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 338                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 339                 return -1;
 340         }
 341
 342         /*
 343          * Workaround for Initiators that have broken connection recovery logic.
 344          *
 345          * "We would really like to get rid of this." Linux-iSCSI.org team
 346          */
 347         memset(buf, 0, 32);
 348         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 349         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 350                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 351                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 352                 return -1;
 353         }
 354
 355         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 356                 return -1;
 357
 358         return 0;
 359 }
 360
 361 /*
 362  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 363  * The Initiator node will be able to enable FIM by proposing them itself.
 364  */
 365 int iscsi_login_disable_FIM_keys(
 366         struct iscsi_param_list *param_list,
 367         struct iscsi_conn *conn)
 368 {
 369         struct iscsi_param *param;
 370
 371         param = iscsi_find_param_from_key("OFMarker", param_list);
 372         if (!param) {
 373                 pr_err("iscsi_find_param_from_key() for"
 374                                 " OFMarker failed\n");
 375                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 376                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 377                 return -1;
 378         }
 379         param->state &= ~PSTATE_NEGOTIATE;
 380
 381         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 382         if (!param) {
 383                 pr_err("iscsi_find_param_from_key() for"
 384                                 " IFMarker failed\n");
 385                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 386                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 387                 return -1;
 388         }
 389         param->state &= ~PSTATE_NEGOTIATE;
 390
 391         param = iscsi_find_param_from_key("IFMarker", param_list);
 392         if (!param) {
 393                 pr_err("iscsi_find_param_from_key() for"
 394                                 " IFMarker failed\n");
 395                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 396                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 397                 return -1;
 398         }
 399         param->state &= ~PSTATE_NEGOTIATE;
 400
 401         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 402         if (!param) {
 403                 pr_err("iscsi_find_param_from_key() for"
 404                                 " IFMarker failed\n");
 405                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 406                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 407                 return -1;
 408         }
 409         param->state &= ~PSTATE_NEGOTIATE;
 410
 411         return 0;
 412 }
 413
 414 static int iscsi_login_non_zero_tsih_s1(
 415         struct iscsi_conn *conn,
 416         unsigned char *buf)
 417 {
 418         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 419
 420         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 421         return 0;
 422 }
 423
 424 /*
 425  *      Add a new connection to an existing session.
 426  */
 427 static int iscsi_login_non_zero_tsih_s2(
 428         struct iscsi_conn *conn,
 429         unsigned char *buf)
 430 {
 431         struct iscsi_portal_group *tpg = conn->tpg;
 432         struct iscsi_session *sess = NULL, *sess_p = NULL;
 433         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 434         struct se_session *se_sess, *se_sess_tmp;
 435         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 436
 437         spin_lock_bh(&se_tpg->session_lock);
 438         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 439                         sess_list) {
 440
 441                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 442                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 443                     atomic_read(&sess_p->session_logout) ||
 444                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 445                         continue;
 446                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 447                      (sess_p->tsih == pdu->tsih)) {
 448                         iscsit_inc_session_usage_count(sess_p);
 449                         iscsit_stop_time2retain_timer(sess_p);
 450                         sess = sess_p;
 451                         break;
 452                 }
 453         }
 454         spin_unlock_bh(&se_tpg->session_lock);
 455
 456         /*
 457          * If the Time2Retain handler has expired, the session is already gone.
 458          */
 459         if (!sess) {
 460                 pr_err("Initiator attempting to add a connection to"
 461                         " a non-existent session, rejecting iSCSI Login.\n");
 462                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 463                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 464                 return -1;
 465         }
 466
 467         /*
 468          * Stop the Time2Retain timer if this is a failed session, we restart
 469          * the timer if the login is not successful.
 470          */
 471         spin_lock_bh(&sess->conn_lock);
 472         if (sess->session_state == TARG_SESS_STATE_FAILED)
 473                 atomic_set(&sess->session_continuation, 1);
 474         spin_unlock_bh(&sess->conn_lock);
 475
 476         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 477
 478         if (iscsi_copy_param_list(&conn->param_list,
 479                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 480                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 481                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 482                 return -1;
 483         }
 484
 485         iscsi_set_keys_to_negotiate(0, conn->param_list);
 486         /*
 487          * Need to send TargetPortalGroupTag back in first login response
 488          * on any iSCSI connection where the Initiator provides TargetName.
 489          * See 5.3.1.  Login Phase Start
 490          *
 491          * In our case, we have already located the struct iscsi_tiqn at this point.
 492          */
 493         memset(buf, 0, 32);
 494         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 495         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 496                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 497                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 498                 return -1;
 499         }
 500
 501         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 502 }
 503
 504 int iscsi_login_post_auth_non_zero_tsih(
 505         struct iscsi_conn *conn,
 506         u16 cid,
 507         u32 exp_statsn)
 508 {
 509         struct iscsi_conn *conn_ptr = NULL;
 510         struct iscsi_conn_recovery *cr = NULL;
 511         struct iscsi_session *sess = conn->sess;
 512
 513         /*
 514          * By following item 5 in the login table,  if we have found
 515          * an existing ISID and a valid/existing TSIH and an existing
 516          * CID we do connection reinstatement.  Currently we dont not
 517          * support it so we send back an non-zero status class to the
 518          * initiator and release the new connection.
 519          */
 520         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 521         if ((conn_ptr)) {
 522                 pr_err("Connection exists with CID %hu for %s,"
 523                         " performing connection reinstatement.\n",
 524                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 525
 526                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 527                 iscsit_dec_conn_usage_count(conn_ptr);
 528         }
 529
 530         /*
 531          * Check for any connection recovery entires containing CID.
 532          * We use the original ExpStatSN sent in the first login request
 533          * to acknowledge commands for the failed connection.
 534          *
 535          * Also note that an explict logout may have already been sent,
 536          * but the response may not be sent due to additional connection
 537          * loss.
 538          */
 539         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 540                 cr = iscsit_get_inactive_connection_recovery_entry(
 541                                 sess, cid);
 542                 if ((cr)) {
 543                         pr_debug("Performing implicit logout"
 544                                 " for connection recovery on CID: %hu\n",
 545                                         conn->cid);
 546                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 547                 }
 548         }
 549
 550         /*
 551          * Else we follow item 4 from the login table in that we have
 552          * found an existing ISID and a valid/existing TSIH and a new
 553          * CID we go ahead and continue to add a new connection to the
 554          * session.
 555          */
 556         pr_debug("Adding CID %hu to existing session for %s.\n",
 557                         cid, sess->sess_ops->InitiatorName);
 558
 559         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 560                 pr_err("Adding additional connection to this session"
 561                         " would exceed MaxConnections %d, login failed.\n",
 562                                 sess->sess_ops->MaxConnections);
 563                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 564                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 565                 return -1;
 566         }
 567
 568         return 0;
 569 }
 570
 571 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 572 {
 573         struct iscsi_session *sess = conn->sess;
 574
 575         if (!sess->sess_ops->SessionType)
 576                 iscsit_start_nopin_timer(conn);
 577 }
 578
 579 static int iscsi_post_login_handler(
 580         struct iscsi_np *np,
 581         struct iscsi_conn *conn,
 582         u8 zero_tsih)
 583 {
 584         int stop_timer = 0;
 585         struct iscsi_session *sess = conn->sess;
 586         struct se_session *se_sess = sess->se_sess;
 587         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 588         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 589         struct iscsi_thread_set *ts;
 590
 591         iscsit_inc_conn_usage_count(conn);
 592
 593         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 594                         ISCSI_LOGIN_STATUS_ACCEPT);
 595
 596         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 597         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 598
 599         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 600         iscsit_set_sync_and_steering_values(conn);
 601         /*
 602          * SCSI Initiator -> SCSI Target Port Mapping
 603          */
 604         ts = iscsi_get_thread_set();
 605         if (!zero_tsih) {
 606                 iscsi_set_session_parameters(sess->sess_ops,
 607                                 conn->param_list, 0);
 608                 iscsi_release_param_list(conn->param_list);
 609                 conn->param_list = NULL;
 610
 611                 spin_lock_bh(&sess->conn_lock);
 612                 atomic_set(&sess->session_continuation, 0);
 613                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 614                         pr_debug("Moving to"
 615                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 616                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 617                         stop_timer = 1;
 618                 }
 619
 620                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 621                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 622                         conn->local_ip, conn->local_port, tpg->tpgt);
 623
 624                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 625                 atomic_inc(&sess->nconn);
 626                 pr_debug("Incremented iSCSI Connection count to %hu"
 627                         " from node: %s\n", atomic_read(&sess->nconn),
 628                         sess->sess_ops->InitiatorName);
 629                 spin_unlock_bh(&sess->conn_lock);
 630
 631                 iscsi_post_login_start_timers(conn);
 632                 iscsi_activate_thread_set(conn, ts);
 633                 /*
 634                  * Determine CPU mask to ensure connection's RX and TX kthreads
 635                  * are scheduled on the same CPU.
 636                  */
 637                 iscsit_thread_get_cpumask(conn);
 638                 conn->conn_rx_reset_cpumask = 1;
 639                 conn->conn_tx_reset_cpumask = 1;
 640
 641                 iscsit_dec_conn_usage_count(conn);
 642                 if (stop_timer) {
 643                         spin_lock_bh(&se_tpg->session_lock);
 644                         iscsit_stop_time2retain_timer(sess);
 645                         spin_unlock_bh(&se_tpg->session_lock);
 646                 }
 647                 iscsit_dec_session_usage_count(sess);
 648                 return 0;
 649         }
 650
 651         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 652         iscsi_release_param_list(conn->param_list);
 653         conn->param_list = NULL;
 654
 655         iscsit_determine_maxcmdsn(sess);
 656
 657         spin_lock_bh(&se_tpg->session_lock);
 658         __transport_register_session(&sess->tpg->tpg_se_tpg,
 659                         se_sess->se_node_acl, se_sess, sess);
 660         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 661         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 662
 663         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 664                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 665                 tpg->tpgt);
 666
 667         spin_lock_bh(&sess->conn_lock);
 668         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 669         atomic_inc(&sess->nconn);
 670         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 671                 " %s\n", atomic_read(&sess->nconn),
 672                 sess->sess_ops->InitiatorName);
 673         spin_unlock_bh(&sess->conn_lock);
 674
 675         sess->sid = tpg->sid++;
 676         if (!sess->sid)
 677                 sess->sid = tpg->sid++;
 678         pr_debug("Established iSCSI session from node: %s\n",
 679                         sess->sess_ops->InitiatorName);
 680
 681         tpg->nsessions++;
 682         if (tpg->tpg_tiqn)
 683                 tpg->tpg_tiqn->tiqn_nsessions++;
 684
 685         pr_debug("Incremented number of active iSCSI sessions to %u on"
 686                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 687         spin_unlock_bh(&se_tpg->session_lock);
 688
 689         iscsi_post_login_start_timers(conn);
 690         iscsi_activate_thread_set(conn, ts);
 691         /*
 692          * Determine CPU mask to ensure connection's RX and TX kthreads
 693          * are scheduled on the same CPU.
 694          */
 695         iscsit_thread_get_cpumask(conn);
 696         conn->conn_rx_reset_cpumask = 1;
 697         conn->conn_tx_reset_cpumask = 1;
 698
 699         iscsit_dec_conn_usage_count(conn);
 700
 701         return 0;
 702 }
 703
 704 static void iscsi_handle_login_thread_timeout(unsigned long data)
 705 {
 706         struct iscsi_np *np = (struct iscsi_np *) data;
 707
 708         spin_lock_bh(&np->np_thread_lock);
 709         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 710                         np->np_ip, np->np_port);
 711
 712         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 713                 spin_unlock_bh(&np->np_thread_lock);
 714                 return;
 715         }
 716
 717         if (np->np_thread)
 718                 send_sig(SIGINT, np->np_thread, 1);
 719
 720         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 721         spin_unlock_bh(&np->np_thread_lock);
 722 }
 723
 724 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 725 {
 726         /*
 727          * This used the TA_LOGIN_TIMEOUT constant because at this
 728          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 729          */
 730         spin_lock_bh(&np->np_thread_lock);
 731         init_timer(&np->np_login_timer);
 732         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 733         np->np_login_timer.data = (unsigned long)np;
 734         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 735         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 736         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 737         add_timer(&np->np_login_timer);
 738
 739         pr_debug("Added timeout timer to iSCSI login request for"
 740                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 741         spin_unlock_bh(&np->np_thread_lock);
 742 }
 743
 744 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 745 {
 746         spin_lock_bh(&np->np_thread_lock);
 747         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 748                 spin_unlock_bh(&np->np_thread_lock);
 749                 return;
 750         }
 751         np->np_login_timer_flags |= ISCSI_TF_STOP;
 752         spin_unlock_bh(&np->np_thread_lock);
 753
 754         del_timer_sync(&np->np_login_timer);
 755
 756         spin_lock_bh(&np->np_thread_lock);
 757         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 758         spin_unlock_bh(&np->np_thread_lock);
 759 }
 760
 761 int iscsi_target_setup_login_socket(
 762         struct iscsi_np *np,
 763         struct __kernel_sockaddr_storage *sockaddr)
 764 {
 765         struct socket *sock;
 766         int backlog = 5, ret, opt = 0, len;
 767
 768         switch (np->np_network_transport) {
 769         case ISCSI_TCP:
 770                 np->np_ip_proto = IPPROTO_TCP;
 771                 np->np_sock_type = SOCK_STREAM;
 772                 break;
 773         case ISCSI_SCTP_TCP:
 774                 np->np_ip_proto = IPPROTO_SCTP;
 775                 np->np_sock_type = SOCK_STREAM;
 776                 break;
 777         case ISCSI_SCTP_UDP:
 778                 np->np_ip_proto = IPPROTO_SCTP;
 779                 np->np_sock_type = SOCK_SEQPACKET;
 780                 break;
 781         case ISCSI_IWARP_TCP:
 782         case ISCSI_IWARP_SCTP:
 783         case ISCSI_INFINIBAND:
 784         default:
 785                 pr_err("Unsupported network_transport: %d\n",
 786                                 np->np_network_transport);
 787                 return -EINVAL;
 788         }
 789
 790         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 791                         np->np_ip_proto, &sock);
 792         if (ret < 0) {
 793                 pr_err("sock_create() failed.\n");
 794                 return ret;
 795         }
 796         np->np_socket = sock;
 797         /*
 798          * The SCTP stack needs struct socket->file.
 799          */
 800         if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
 801             (np->np_network_transport == ISCSI_SCTP_UDP)) {
 802                 if (!sock->file) {
 803                         sock->file = kzalloc(sizeof(struct file), GFP_KERNEL);
 804                         if (!sock->file) {
 805                                 pr_err("Unable to allocate struct"
 806                                                 " file for SCTP\n");
 807                                 ret = -ENOMEM;
 808                                 goto fail;
 809                         }
 810                         np->np_flags |= NPF_SCTP_STRUCT_FILE;
 811                 }
 812         }
 813         /*
 814          * Setup the np->np_sockaddr from the passed sockaddr setup
 815          * in iscsi_target_configfs.c code..
 816          */
 817         memcpy(&np->np_sockaddr, sockaddr,
 818                         sizeof(struct __kernel_sockaddr_storage));
 819
 820         if (sockaddr->ss_family == AF_INET6)
 821                 len = sizeof(struct sockaddr_in6);
 822         else
 823                 len = sizeof(struct sockaddr_in);
 824         /*
 825          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 826          */
 827         /* FIXME: Someone please explain why this is endian-safe */
 828         opt = 1;
 829         if (np->np_network_transport == ISCSI_TCP) {
 830                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 831                                 (char *)&opt, sizeof(opt));
 832                 if (ret < 0) {
 833                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 834                                 " failed: %d\n", ret);
 835                         goto fail;
 836                 }
 837         }
 838
 839         /* FIXME: Someone please explain why this is endian-safe */
 840         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 841                         (char *)&opt, sizeof(opt));
 842         if (ret < 0) {
 843                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 844                         " failed\n");
 845                 goto fail;
 846         }
 847
 848         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 849                         (char *)&opt, sizeof(opt));
 850         if (ret < 0) {
 851                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 852                         " failed\n");
 853                 goto fail;
 854         }
 855
 856         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 857         if (ret < 0) {
 858                 pr_err("kernel_bind() failed: %d\n", ret);
 859                 goto fail;
 860         }
 861
 862         ret = kernel_listen(sock, backlog);
 863         if (ret != 0) {
 864                 pr_err("kernel_listen() failed: %d\n", ret);
 865                 goto fail;
 866         }
 867
 868         return 0;
 869
 870 fail:
 871         np->np_socket = NULL;
 872         if (sock) {
 873                 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 874                         kfree(sock->file);
 875                         sock->file = NULL;
 876                 }
 877
 878                 sock_release(sock);
 879         }
 880         return ret;
 881 }
 882
 883 static int __iscsi_target_login_thread(struct iscsi_np *np)
 884 {
 885         u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
 886         int err, ret = 0, set_sctp_conn_flag, stop;
 887         struct iscsi_conn *conn = NULL;
 888         struct iscsi_login *login;
 889         struct iscsi_portal_group *tpg = NULL;
 890         struct socket *new_sock, *sock;
 891         struct kvec iov;
 892         struct iscsi_login_req *pdu;
 893         struct sockaddr_in sock_in;
 894         struct sockaddr_in6 sock_in6;
 895
 896         flush_signals(current);
 897         set_sctp_conn_flag = 0;
 898         sock = np->np_socket;
 899
 900         spin_lock_bh(&np->np_thread_lock);
 901         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 902                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 903                 complete(&np->np_restart_comp);
 904         } else {
 905                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 906         }
 907         spin_unlock_bh(&np->np_thread_lock);
 908
 909         if (kernel_accept(sock, &new_sock, 0) < 0) {
 910                 spin_lock_bh(&np->np_thread_lock);
 911                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
 912                         spin_unlock_bh(&np->np_thread_lock);
 913                         complete(&np->np_restart_comp);
 914                         /* Get another socket */
 915                         return 1;
 916                 }
 917                 spin_unlock_bh(&np->np_thread_lock);
 918                 goto out;
 919         }
 920         /*
 921          * The SCTP stack needs struct socket->file.
 922          */
 923         if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
 924             (np->np_network_transport == ISCSI_SCTP_UDP)) {
 925                 if (!new_sock->file) {
 926                         new_sock->file = kzalloc(
 927                                         sizeof(struct file), GFP_KERNEL);
 928                         if (!new_sock->file) {
 929                                 pr_err("Unable to allocate struct"
 930                                                 " file for SCTP\n");
 931                                 sock_release(new_sock);
 932                                 /* Get another socket */
 933                                 return 1;
 934                         }
 935                         set_sctp_conn_flag = 1;
 936                 }
 937         }
 938
 939         iscsi_start_login_thread_timer(np);
 940
 941         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
 942         if (!conn) {
 943                 pr_err("Could not allocate memory for"
 944                         " new connection\n");
 945                 if (set_sctp_conn_flag) {
 946                         kfree(new_sock->file);
 947                         new_sock->file = NULL;
 948                 }
 949                 sock_release(new_sock);
 950                 /* Get another socket */
 951                 return 1;
 952         }
 953
 954         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
 955         conn->conn_state = TARG_CONN_STATE_FREE;
 956         conn->sock = new_sock;
 957
 958         if (set_sctp_conn_flag)
 959                 conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE;
 960
 961         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
 962         conn->conn_state = TARG_CONN_STATE_XPT_UP;
 963
 964         /*
 965          * Allocate conn->conn_ops early as a failure calling
 966          * iscsit_tx_login_rsp() below will call tx_data().
 967          */
 968         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
 969         if (!conn->conn_ops) {
 970                 pr_err("Unable to allocate memory for"
 971                         " struct iscsi_conn_ops.\n");
 972                 goto new_sess_out;
 973         }
 974         /*
 975          * Perform the remaining iSCSI connection initialization items..
 976          */
 977         if (iscsi_login_init_conn(conn) < 0)
 978                 goto new_sess_out;
 979
 980         memset(buffer, 0, ISCSI_HDR_LEN);
 981         memset(&iov, 0, sizeof(struct kvec));
 982         iov.iov_base    = buffer;
 983         iov.iov_len     = ISCSI_HDR_LEN;
 984
 985         if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
 986                 pr_err("rx_data() returned an error.\n");
 987                 goto new_sess_out;
 988         }
 989
 990         iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
 991         if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
 992                 pr_err("First opcode is not login request,"
 993                         " failing login request.\n");
 994                 goto new_sess_out;
 995         }
 996
 997         pdu                     = (struct iscsi_login_req *) buffer;
 998         pdu->cid                = be16_to_cpu(pdu->cid);
 999         pdu->tsih               = be16_to_cpu(pdu->tsih);
1000         pdu->itt                = be32_to_cpu(pdu->itt);
1001         pdu->cmdsn              = be32_to_cpu(pdu->cmdsn);
1002         pdu->exp_statsn         = be32_to_cpu(pdu->exp_statsn);
1003         /*
1004          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1005          * when Status-Class != 0.
1006         */
1007         conn->login_itt         = pdu->itt;
1008
1009         spin_lock_bh(&np->np_thread_lock);
1010         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1011                 spin_unlock_bh(&np->np_thread_lock);
1012                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1013                         " active.\n", np->np_ip, np->np_port);
1014                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1015                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1016                 goto new_sess_out;
1017         }
1018         spin_unlock_bh(&np->np_thread_lock);
1019
1020         if (np->np_sockaddr.ss_family == AF_INET6) {
1021                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1022
1023                 if (conn->sock->ops->getname(conn->sock,
1024                                 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
1025                         pr_err("sock_ops->getname() failed.\n");
1026                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1027                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1028                         goto new_sess_out;
1029                 }
1030                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1031                                 &sock_in6.sin6_addr.in6_u);
1032                 conn->login_port = ntohs(sock_in6.sin6_port);
1033
1034                 if (conn->sock->ops->getname(conn->sock,
1035                                 (struct sockaddr *)&sock_in6, &err, 0) < 0) {
1036                         pr_err("sock_ops->getname() failed.\n");
1037                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1038                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1039                         goto new_sess_out;
1040                 }
1041                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
1042                                 &sock_in6.sin6_addr.in6_u);
1043                 conn->local_port = ntohs(sock_in6.sin6_port);
1044
1045         } else {
1046                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1047
1048                 if (conn->sock->ops->getname(conn->sock,
1049                                 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1050                         pr_err("sock_ops->getname() failed.\n");
1051                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1052                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1053                         goto new_sess_out;
1054                 }
1055                 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1056                 conn->login_port = ntohs(sock_in.sin_port);
1057
1058                 if (conn->sock->ops->getname(conn->sock,
1059                                 (struct sockaddr *)&sock_in, &err, 0) < 0) {
1060                         pr_err("sock_ops->getname() failed.\n");
1061                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1062                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
1063                         goto new_sess_out;
1064                 }
1065                 sprintf(conn->local_ip, "%pI4", &sock_in.sin_addr.s_addr);
1066                 conn->local_port = ntohs(sock_in.sin_port);
1067         }
1068
1069         conn->network_transport = np->np_network_transport;
1070
1071         pr_debug("Received iSCSI login request from %s on %s Network"
1072                         " Portal %s:%hu\n", conn->login_ip,
1073                 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1074                         conn->local_ip, conn->local_port);
1075
1076         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1077         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1078
1079         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1080                         pdu->min_version) < 0)
1081                 goto new_sess_out;
1082
1083         zero_tsih = (pdu->tsih == 0x0000);
1084         if ((zero_tsih)) {
1085                 /*
1086                  * This is the leading connection of a new session.
1087                  * We wait until after authentication to check for
1088                  * session reinstatement.
1089                  */
1090                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1091                         goto new_sess_out;
1092         } else {
1093                 /*
1094                  * Add a new connection to an existing session.
1095                  * We check for a non-existant session in
1096                  * iscsi_login_non_zero_tsih_s2() below based
1097                  * on ISID/TSIH, but wait until after authentication
1098                  * to check for connection reinstatement, etc.
1099                  */
1100                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1101                         goto new_sess_out;
1102         }
1103
1104         /*
1105          * This will process the first login request, and call
1106          * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1107          */
1108         login = iscsi_target_init_negotiation(np, conn, buffer);
1109         if (!login) {
1110                 tpg = conn->tpg;
1111                 goto new_sess_out;
1112         }
1113
1114         tpg = conn->tpg;
1115         if (!tpg) {
1116                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1117                 goto new_sess_out;
1118         }
1119
1120         if (zero_tsih) {
1121                 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1122                         iscsi_target_nego_release(login, conn);
1123                         goto new_sess_out;
1124                 }
1125         } else {
1126                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1127                         iscsi_target_nego_release(login, conn);
1128                         goto old_sess_out;
1129                 }
1130         }
1131
1132         if (iscsi_target_start_negotiation(login, conn) < 0)
1133                 goto new_sess_out;
1134
1135         if (!conn->sess) {
1136                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1137                 goto new_sess_out;
1138         }
1139
1140         iscsi_stop_login_thread_timer(np);
1141
1142         if (signal_pending(current))
1143                 goto new_sess_out;
1144
1145         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1146
1147         if (ret < 0)
1148                 goto new_sess_out;
1149
1150         iscsit_deaccess_np(np, tpg);
1151         tpg = NULL;
1152         /* Get another socket */
1153         return 1;
1154
1155 new_sess_out:
1156         pr_err("iSCSI Login negotiation failed.\n");
1157         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1158                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1159         if (!zero_tsih || !conn->sess)
1160                 goto old_sess_out;
1161         if (conn->sess->se_sess)
1162                 transport_free_session(conn->sess->se_sess);
1163         if (conn->sess->session_index != 0) {
1164                 spin_lock_bh(&sess_idr_lock);
1165                 idr_remove(&sess_idr, conn->sess->session_index);
1166                 spin_unlock_bh(&sess_idr_lock);
1167         }
1168         if (conn->sess->sess_ops)
1169                 kfree(conn->sess->sess_ops);
1170         if (conn->sess)
1171                 kfree(conn->sess);
1172 old_sess_out:
1173         iscsi_stop_login_thread_timer(np);
1174         /*
1175          * If login negotiation fails check if the Time2Retain timer
1176          * needs to be restarted.
1177          */
1178         if (!zero_tsih && conn->sess) {
1179                 spin_lock_bh(&conn->sess->conn_lock);
1180                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1181                         struct se_portal_group *se_tpg =
1182                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1183
1184                         atomic_set(&conn->sess->session_continuation, 0);
1185                         spin_unlock_bh(&conn->sess->conn_lock);
1186                         spin_lock_bh(&se_tpg->session_lock);
1187                         iscsit_start_time2retain_handler(conn->sess);
1188                         spin_unlock_bh(&se_tpg->session_lock);
1189                 } else
1190                         spin_unlock_bh(&conn->sess->conn_lock);
1191                 iscsit_dec_session_usage_count(conn->sess);
1192         }
1193
1194         if (!IS_ERR(conn->conn_rx_hash.tfm))
1195                 crypto_free_hash(conn->conn_rx_hash.tfm);
1196         if (!IS_ERR(conn->conn_tx_hash.tfm))
1197                 crypto_free_hash(conn->conn_tx_hash.tfm);
1198
1199         if (conn->conn_cpumask)
1200                 free_cpumask_var(conn->conn_cpumask);
1201
1202         kfree(conn->conn_ops);
1203
1204         if (conn->param_list) {
1205                 iscsi_release_param_list(conn->param_list);
1206                 conn->param_list = NULL;
1207         }
1208         if (conn->sock) {
1209                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
1210                         kfree(conn->sock->file);
1211                         conn->sock->file = NULL;
1212                 }
1213                 sock_release(conn->sock);
1214         }
1215         kfree(conn);
1216
1217         if (tpg) {
1218                 iscsit_deaccess_np(np, tpg);
1219                 tpg = NULL;
1220         }
1221
1222 out:
1223         stop = kthread_should_stop();
1224         if (!stop && signal_pending(current)) {
1225                 spin_lock_bh(&np->np_thread_lock);
1226                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1227                 spin_unlock_bh(&np->np_thread_lock);
1228         }
1229         /* Wait for another socket.. */
1230         if (!stop)
1231                 return 1;
1232
1233         iscsi_stop_login_thread_timer(np);
1234         spin_lock_bh(&np->np_thread_lock);
1235         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1236         spin_unlock_bh(&np->np_thread_lock);
1237         return 0;
1238 }
1239
1240 int iscsi_target_login_thread(void *arg)
1241 {
1242         struct iscsi_np *np = arg;
1243         int ret;
1244
1245         allow_signal(SIGINT);
1246
1247         while (!kthread_should_stop()) {
1248                 ret = __iscsi_target_login_thread(np);
1249                 /*
1250                  * We break and exit here unless another sock_accept() call
1251                  * is expected.
1252                  */
1253                 if (ret != 1)
1254                         break;
1255         }
1256
1257         return 0;
1258 }