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