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 #include <target/iscsi/iscsi_transport.h>
  43
  44 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  45 {
  46         struct iscsi_login *login;
  47
  48         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  49         if (!login) {
  50                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  51                 return NULL;
  52         }
  53         login->conn = conn;
  54         login->first_request = 1;
  55
  56         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  57         if (!login->req_buf) {
  58                 pr_err("Unable to allocate memory for response buffer.\n");
  59                 goto out_login;
  60         }
  61
  62         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  63         if (!login->rsp_buf) {
  64                 pr_err("Unable to allocate memory for request buffer.\n");
  65                 goto out_req_buf;
  66         }
  67
  68         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  69         if (!conn->conn_ops) {
  70                 pr_err("Unable to allocate memory for"
  71                         " struct iscsi_conn_ops.\n");
  72                 goto out_rsp_buf;
  73         }
  74
  75         init_waitqueue_head(&conn->queues_wq);
  76         INIT_LIST_HEAD(&conn->conn_list);
  77         INIT_LIST_HEAD(&conn->conn_cmd_list);
  78         INIT_LIST_HEAD(&conn->immed_queue_list);
  79         INIT_LIST_HEAD(&conn->response_queue_list);
  80         init_completion(&conn->conn_post_wait_comp);
  81         init_completion(&conn->conn_wait_comp);
  82         init_completion(&conn->conn_wait_rcfr_comp);
  83         init_completion(&conn->conn_waiting_on_uc_comp);
  84         init_completion(&conn->conn_logout_comp);
  85         init_completion(&conn->rx_half_close_comp);
  86         init_completion(&conn->tx_half_close_comp);
  87         spin_lock_init(&conn->cmd_lock);
  88         spin_lock_init(&conn->conn_usage_lock);
  89         spin_lock_init(&conn->immed_queue_lock);
  90         spin_lock_init(&conn->nopin_timer_lock);
  91         spin_lock_init(&conn->response_queue_lock);
  92         spin_lock_init(&conn->state_lock);
  93
  94         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  95                 pr_err("Unable to allocate conn->conn_cpumask\n");
  96                 goto out_conn_ops;
  97         }
  98         conn->conn_login = login;
  99
 100         return login;
 101
 102 out_conn_ops:
 103         kfree(conn->conn_ops);
 104 out_rsp_buf:
 105         kfree(login->rsp_buf);
 106 out_req_buf:
 107         kfree(login->req_buf);
 108 out_login:
 109         kfree(login);
 110         return NULL;
 111 }
 112
 113 /*
 114  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 115  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 116  */
 117 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 118 {
 119         /*
 120          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 121          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 122          * to software 1x8 byte slicing from crc32c.ko
 123          */
 124         conn->conn_rx_hash.flags = 0;
 125         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 126                                                 CRYPTO_ALG_ASYNC);
 127         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 128                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 129                 return -ENOMEM;
 130         }
 131
 132         conn->conn_tx_hash.flags = 0;
 133         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 134                                                 CRYPTO_ALG_ASYNC);
 135         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 136                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 137                 crypto_free_hash(conn->conn_rx_hash.tfm);
 138                 return -ENOMEM;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int iscsi_login_check_initiator_version(
 145         struct iscsi_conn *conn,
 146         u8 version_max,
 147         u8 version_min)
 148 {
 149         if ((version_max != 0x00) || (version_min != 0x00)) {
 150                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 151                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 152                         version_min, version_max);
 153                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 154                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 155                 return -1;
 156         }
 157
 158         return 0;
 159 }
 160
 161 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 162 {
 163         int sessiontype;
 164         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 165         struct iscsi_portal_group *tpg = conn->tpg;
 166         struct iscsi_session *sess = NULL, *sess_p = NULL;
 167         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 168         struct se_session *se_sess, *se_sess_tmp;
 169
 170         initiatorname_param = iscsi_find_param_from_key(
 171                         INITIATORNAME, conn->param_list);
 172         sessiontype_param = iscsi_find_param_from_key(
 173                         SESSIONTYPE, conn->param_list);
 174         if (!initiatorname_param || !sessiontype_param) {
 175                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 176                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 177                 return -1;
 178         }
 179
 180         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 181
 182         spin_lock_bh(&se_tpg->session_lock);
 183         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 184                         sess_list) {
 185
 186                 sess_p = se_sess->fabric_sess_ptr;
 187                 spin_lock(&sess_p->conn_lock);
 188                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 189                     atomic_read(&sess_p->session_logout) ||
 190                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 191                         spin_unlock(&sess_p->conn_lock);
 192                         continue;
 193                 }
 194                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 195                    (!strcmp(sess_p->sess_ops->InitiatorName,
 196                             initiatorname_param->value) &&
 197                    (sess_p->sess_ops->SessionType == sessiontype))) {
 198                         atomic_set(&sess_p->session_reinstatement, 1);
 199                         spin_unlock(&sess_p->conn_lock);
 200                         iscsit_inc_session_usage_count(sess_p);
 201                         iscsit_stop_time2retain_timer(sess_p);
 202                         sess = sess_p;
 203                         break;
 204                 }
 205                 spin_unlock(&sess_p->conn_lock);
 206         }
 207         spin_unlock_bh(&se_tpg->session_lock);
 208         /*
 209          * If the Time2Retain handler has expired, the session is already gone.
 210          */
 211         if (!sess)
 212                 return 0;
 213
 214         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 215                 " preforming session reinstatement.\n", (sessiontype) ?
 216                 "Discovery" : "Normal", sess->sid,
 217                 sess->sess_ops->InitiatorName);
 218
 219         spin_lock_bh(&sess->conn_lock);
 220         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 221                 spin_unlock_bh(&sess->conn_lock);
 222                 iscsit_dec_session_usage_count(sess);
 223                 target_put_session(sess->se_sess);
 224                 return 0;
 225         }
 226         spin_unlock_bh(&sess->conn_lock);
 227
 228         iscsit_stop_session(sess, 1, 1);
 229         iscsit_dec_session_usage_count(sess);
 230
 231         target_put_session(sess->se_sess);
 232         return 0;
 233 }
 234
 235 static void iscsi_login_set_conn_values(
 236         struct iscsi_session *sess,
 237         struct iscsi_conn *conn,
 238         __be16 cid)
 239 {
 240         conn->sess              = sess;
 241         conn->cid               = be16_to_cpu(cid);
 242         /*
 243          * Generate a random Status sequence number (statsn) for the new
 244          * iSCSI connection.
 245          */
 246         get_random_bytes(&conn->stat_sn, sizeof(u32));
 247
 248         mutex_lock(&auth_id_lock);
 249         conn->auth_id           = iscsit_global->auth_id++;
 250         mutex_unlock(&auth_id_lock);
 251 }
 252
 253 static __printf(2, 3) int iscsi_change_param_sprintf(
 254         struct iscsi_conn *conn,
 255         const char *fmt, ...)
 256 {
 257         va_list args;
 258         unsigned char buf[64];
 259
 260         memset(buf, 0, sizeof buf);
 261
 262         va_start(args, fmt);
 263         vsnprintf(buf, sizeof buf, fmt, args);
 264         va_end(args);
 265
 266         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 267                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 268                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 269                 return -1;
 270         }
 271
 272         return 0;
 273 }
 274
 275 /*
 276  *      This is the leading connection of a new session,
 277  *      or session reinstatement.
 278  */
 279 static int iscsi_login_zero_tsih_s1(
 280         struct iscsi_conn *conn,
 281         unsigned char *buf)
 282 {
 283         struct iscsi_session *sess = NULL;
 284         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 285         int ret;
 286
 287         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 288         if (!sess) {
 289                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 290                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 291                 pr_err("Could not allocate memory for session\n");
 292                 return -ENOMEM;
 293         }
 294
 295         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 296         sess->init_task_tag     = pdu->itt;
 297         memcpy(&sess->isid, pdu->isid, 6);
 298         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 299         INIT_LIST_HEAD(&sess->sess_conn_list);
 300         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 301         INIT_LIST_HEAD(&sess->cr_active_list);
 302         INIT_LIST_HEAD(&sess->cr_inactive_list);
 303         init_completion(&sess->async_msg_comp);
 304         init_completion(&sess->reinstatement_comp);
 305         init_completion(&sess->session_wait_comp);
 306         init_completion(&sess->session_waiting_on_uc_comp);
 307         mutex_init(&sess->cmdsn_mutex);
 308         spin_lock_init(&sess->conn_lock);
 309         spin_lock_init(&sess->cr_a_lock);
 310         spin_lock_init(&sess->cr_i_lock);
 311         spin_lock_init(&sess->session_usage_lock);
 312         spin_lock_init(&sess->ttt_lock);
 313
 314         idr_preload(GFP_KERNEL);
 315         spin_lock_bh(&sess_idr_lock);
 316         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 317         if (ret >= 0)
 318                 sess->session_index = ret;
 319         spin_unlock_bh(&sess_idr_lock);
 320         idr_preload_end();
 321
 322         if (ret < 0) {
 323                 pr_err("idr_alloc() for sess_idr failed\n");
 324                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 325                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 326                 kfree(sess);
 327                 return -ENOMEM;
 328         }
 329
 330         sess->creation_time = get_jiffies_64();
 331         spin_lock_init(&sess->session_stats_lock);
 332         /*
 333          * The FFP CmdSN window values will be allocated from the TPG's
 334          * Initiator Node's ACL once the login has been successfully completed.
 335          */
 336         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 337
 338         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 339         if (!sess->sess_ops) {
 340                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 341                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 342                 pr_err("Unable to allocate memory for"
 343                                 " struct iscsi_sess_ops.\n");
 344                 kfree(sess);
 345                 return -ENOMEM;
 346         }
 347
 348         sess->se_sess = transport_init_session();
 349         if (IS_ERR(sess->se_sess)) {
 350                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 351                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 352                 kfree(sess);
 353                 return -ENOMEM;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int iscsi_login_zero_tsih_s2(
 360         struct iscsi_conn *conn)
 361 {
 362         struct iscsi_node_attrib *na;
 363         struct iscsi_session *sess = conn->sess;
 364         bool iser = false;
 365
 366         sess->tpg = conn->tpg;
 367
 368         /*
 369          * Assign a new TPG Session Handle.  Note this is protected with
 370          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 371          */
 372         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 373         if (!sess->tsih)
 374                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 375
 376         /*
 377          * Create the default params from user defined values..
 378          */
 379         if (iscsi_copy_param_list(&conn->param_list,
 380                                 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
 381                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 382                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 383                 return -1;
 384         }
 385
 386         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 387                 iser = true;
 388
 389         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 390
 391         if (sess->sess_ops->SessionType)
 392                 return iscsi_set_keys_irrelevant_for_discovery(
 393                                 conn->param_list);
 394
 395         na = iscsit_tpg_get_node_attrib(sess);
 396
 397         /*
 398          * Need to send TargetPortalGroupTag back in first login response
 399          * on any iSCSI connection where the Initiator provides TargetName.
 400          * See 5.3.1.  Login Phase Start
 401          *
 402          * In our case, we have already located the struct iscsi_tiqn at this point.
 403          */
 404         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 405                 return -1;
 406
 407         /*
 408          * Workaround for Initiators that have broken connection recovery logic.
 409          *
 410          * "We would really like to get rid of this." Linux-iSCSI.org team
 411          */
 412         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 413                 return -1;
 414
 415         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 416                 return -1;
 417         /*
 418          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 419          */
 420         if (iser) {
 421                 struct iscsi_param *param;
 422                 unsigned long mrdsl, off;
 423                 int rc;
 424
 425                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 426                         return -1;
 427
 428                 /*
 429                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 430                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 431                  */
 432                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 433                                                   conn->param_list);
 434                 if (!param) {
 435                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 436                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 437                         return -1;
 438                 }
 439                 rc = strict_strtoul(param->value, 0, &mrdsl);
 440                 if (rc < 0) {
 441                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 442                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 443                         return -1;
 444                 }
 445                 off = mrdsl % PAGE_SIZE;
 446                 if (!off)
 447                         return 0;
 448
 449                 if (mrdsl < PAGE_SIZE)
 450                         mrdsl = PAGE_SIZE;
 451                 else
 452                         mrdsl -= off;
 453
 454                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 455                         " to PAGE_SIZE\n", mrdsl);
 456
 457                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 458                         return -1;
 459         }
 460
 461         return 0;
 462 }
 463
 464 /*
 465  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 466  * The Initiator node will be able to enable FIM by proposing them itself.
 467  */
 468 int iscsi_login_disable_FIM_keys(
 469         struct iscsi_param_list *param_list,
 470         struct iscsi_conn *conn)
 471 {
 472         struct iscsi_param *param;
 473
 474         param = iscsi_find_param_from_key("OFMarker", param_list);
 475         if (!param) {
 476                 pr_err("iscsi_find_param_from_key() for"
 477                                 " OFMarker failed\n");
 478                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 479                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 480                 return -1;
 481         }
 482         param->state &= ~PSTATE_NEGOTIATE;
 483
 484         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 485         if (!param) {
 486                 pr_err("iscsi_find_param_from_key() for"
 487                                 " IFMarker failed\n");
 488                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 489                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 490                 return -1;
 491         }
 492         param->state &= ~PSTATE_NEGOTIATE;
 493
 494         param = iscsi_find_param_from_key("IFMarker", param_list);
 495         if (!param) {
 496                 pr_err("iscsi_find_param_from_key() for"
 497                                 " IFMarker failed\n");
 498                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 499                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 500                 return -1;
 501         }
 502         param->state &= ~PSTATE_NEGOTIATE;
 503
 504         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 505         if (!param) {
 506                 pr_err("iscsi_find_param_from_key() for"
 507                                 " IFMarker failed\n");
 508                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 509                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 510                 return -1;
 511         }
 512         param->state &= ~PSTATE_NEGOTIATE;
 513
 514         return 0;
 515 }
 516
 517 static int iscsi_login_non_zero_tsih_s1(
 518         struct iscsi_conn *conn,
 519         unsigned char *buf)
 520 {
 521         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 522
 523         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 524         return 0;
 525 }
 526
 527 /*
 528  *      Add a new connection to an existing session.
 529  */
 530 static int iscsi_login_non_zero_tsih_s2(
 531         struct iscsi_conn *conn,
 532         unsigned char *buf)
 533 {
 534         struct iscsi_portal_group *tpg = conn->tpg;
 535         struct iscsi_session *sess = NULL, *sess_p = NULL;
 536         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 537         struct se_session *se_sess, *se_sess_tmp;
 538         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 539         bool iser = false;
 540
 541         spin_lock_bh(&se_tpg->session_lock);
 542         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 543                         sess_list) {
 544
 545                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 546                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 547                     atomic_read(&sess_p->session_logout) ||
 548                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 549                         continue;
 550                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 551                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 552                         iscsit_inc_session_usage_count(sess_p);
 553                         iscsit_stop_time2retain_timer(sess_p);
 554                         sess = sess_p;
 555                         break;
 556                 }
 557         }
 558         spin_unlock_bh(&se_tpg->session_lock);
 559
 560         /*
 561          * If the Time2Retain handler has expired, the session is already gone.
 562          */
 563         if (!sess) {
 564                 pr_err("Initiator attempting to add a connection to"
 565                         " a non-existent session, rejecting iSCSI Login.\n");
 566                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 567                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 568                 return -1;
 569         }
 570
 571         /*
 572          * Stop the Time2Retain timer if this is a failed session, we restart
 573          * the timer if the login is not successful.
 574          */
 575         spin_lock_bh(&sess->conn_lock);
 576         if (sess->session_state == TARG_SESS_STATE_FAILED)
 577                 atomic_set(&sess->session_continuation, 1);
 578         spin_unlock_bh(&sess->conn_lock);
 579
 580         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 581
 582         if (iscsi_copy_param_list(&conn->param_list,
 583                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 584                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 585                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 586                 return -1;
 587         }
 588
 589         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 590                 iser = true;
 591
 592         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 593         /*
 594          * Need to send TargetPortalGroupTag back in first login response
 595          * on any iSCSI connection where the Initiator provides TargetName.
 596          * See 5.3.1.  Login Phase Start
 597          *
 598          * In our case, we have already located the struct iscsi_tiqn at this point.
 599          */
 600         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 601                 return -1;
 602
 603         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 604 }
 605
 606 int iscsi_login_post_auth_non_zero_tsih(
 607         struct iscsi_conn *conn,
 608         u16 cid,
 609         u32 exp_statsn)
 610 {
 611         struct iscsi_conn *conn_ptr = NULL;
 612         struct iscsi_conn_recovery *cr = NULL;
 613         struct iscsi_session *sess = conn->sess;
 614
 615         /*
 616          * By following item 5 in the login table,  if we have found
 617          * an existing ISID and a valid/existing TSIH and an existing
 618          * CID we do connection reinstatement.  Currently we dont not
 619          * support it so we send back an non-zero status class to the
 620          * initiator and release the new connection.
 621          */
 622         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 623         if (conn_ptr) {
 624                 pr_err("Connection exists with CID %hu for %s,"
 625                         " performing connection reinstatement.\n",
 626                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 627
 628                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 629                 iscsit_dec_conn_usage_count(conn_ptr);
 630         }
 631
 632         /*
 633          * Check for any connection recovery entires containing CID.
 634          * We use the original ExpStatSN sent in the first login request
 635          * to acknowledge commands for the failed connection.
 636          *
 637          * Also note that an explict logout may have already been sent,
 638          * but the response may not be sent due to additional connection
 639          * loss.
 640          */
 641         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 642                 cr = iscsit_get_inactive_connection_recovery_entry(
 643                                 sess, cid);
 644                 if (cr) {
 645                         pr_debug("Performing implicit logout"
 646                                 " for connection recovery on CID: %hu\n",
 647                                         conn->cid);
 648                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 649                 }
 650         }
 651
 652         /*
 653          * Else we follow item 4 from the login table in that we have
 654          * found an existing ISID and a valid/existing TSIH and a new
 655          * CID we go ahead and continue to add a new connection to the
 656          * session.
 657          */
 658         pr_debug("Adding CID %hu to existing session for %s.\n",
 659                         cid, sess->sess_ops->InitiatorName);
 660
 661         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 662                 pr_err("Adding additional connection to this session"
 663                         " would exceed MaxConnections %d, login failed.\n",
 664                                 sess->sess_ops->MaxConnections);
 665                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 666                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 667                 return -1;
 668         }
 669
 670         return 0;
 671 }
 672
 673 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 674 {
 675         struct iscsi_session *sess = conn->sess;
 676         /*
 677          * FIXME: Unsolicitied NopIN support for ISER
 678          */
 679         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 680                 return;
 681
 682         if (!sess->sess_ops->SessionType)
 683                 iscsit_start_nopin_timer(conn);
 684 }
 685
 686 static int iscsi_post_login_handler(
 687         struct iscsi_np *np,
 688         struct iscsi_conn *conn,
 689         u8 zero_tsih)
 690 {
 691         int stop_timer = 0;
 692         struct iscsi_session *sess = conn->sess;
 693         struct se_session *se_sess = sess->se_sess;
 694         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 695         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 696         struct iscsi_thread_set *ts;
 697
 698         iscsit_inc_conn_usage_count(conn);
 699
 700         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 701                         ISCSI_LOGIN_STATUS_ACCEPT);
 702
 703         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 704         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 705
 706         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 707         iscsit_set_sync_and_steering_values(conn);
 708         /*
 709          * SCSI Initiator -> SCSI Target Port Mapping
 710          */
 711         ts = iscsi_get_thread_set();
 712         if (!zero_tsih) {
 713                 iscsi_set_session_parameters(sess->sess_ops,
 714                                 conn->param_list, 0);
 715                 iscsi_release_param_list(conn->param_list);
 716                 conn->param_list = NULL;
 717
 718                 spin_lock_bh(&sess->conn_lock);
 719                 atomic_set(&sess->session_continuation, 0);
 720                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 721                         pr_debug("Moving to"
 722                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 723                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 724                         stop_timer = 1;
 725                 }
 726
 727                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 728                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 729                         conn->local_ip, conn->local_port, tpg->tpgt);
 730
 731                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 732                 atomic_inc(&sess->nconn);
 733                 pr_debug("Incremented iSCSI Connection count to %hu"
 734                         " from node: %s\n", atomic_read(&sess->nconn),
 735                         sess->sess_ops->InitiatorName);
 736                 spin_unlock_bh(&sess->conn_lock);
 737
 738                 iscsi_post_login_start_timers(conn);
 739
 740                 iscsi_activate_thread_set(conn, ts);
 741                 /*
 742                  * Determine CPU mask to ensure connection's RX and TX kthreads
 743                  * are scheduled on the same CPU.
 744                  */
 745                 iscsit_thread_get_cpumask(conn);
 746                 conn->conn_rx_reset_cpumask = 1;
 747                 conn->conn_tx_reset_cpumask = 1;
 748
 749                 iscsit_dec_conn_usage_count(conn);
 750                 if (stop_timer) {
 751                         spin_lock_bh(&se_tpg->session_lock);
 752                         iscsit_stop_time2retain_timer(sess);
 753                         spin_unlock_bh(&se_tpg->session_lock);
 754                 }
 755                 iscsit_dec_session_usage_count(sess);
 756                 return 0;
 757         }
 758
 759         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 760         iscsi_release_param_list(conn->param_list);
 761         conn->param_list = NULL;
 762
 763         iscsit_determine_maxcmdsn(sess);
 764
 765         spin_lock_bh(&se_tpg->session_lock);
 766         __transport_register_session(&sess->tpg->tpg_se_tpg,
 767                         se_sess->se_node_acl, se_sess, sess);
 768         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 769         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 770
 771         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 772                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 773                 tpg->tpgt);
 774
 775         spin_lock_bh(&sess->conn_lock);
 776         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 777         atomic_inc(&sess->nconn);
 778         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 779                 " %s\n", atomic_read(&sess->nconn),
 780                 sess->sess_ops->InitiatorName);
 781         spin_unlock_bh(&sess->conn_lock);
 782
 783         sess->sid = tpg->sid++;
 784         if (!sess->sid)
 785                 sess->sid = tpg->sid++;
 786         pr_debug("Established iSCSI session from node: %s\n",
 787                         sess->sess_ops->InitiatorName);
 788
 789         tpg->nsessions++;
 790         if (tpg->tpg_tiqn)
 791                 tpg->tpg_tiqn->tiqn_nsessions++;
 792
 793         pr_debug("Incremented number of active iSCSI sessions to %u on"
 794                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 795         spin_unlock_bh(&se_tpg->session_lock);
 796
 797         iscsi_post_login_start_timers(conn);
 798         iscsi_activate_thread_set(conn, ts);
 799         /*
 800          * Determine CPU mask to ensure connection's RX and TX kthreads
 801          * are scheduled on the same CPU.
 802          */
 803         iscsit_thread_get_cpumask(conn);
 804         conn->conn_rx_reset_cpumask = 1;
 805         conn->conn_tx_reset_cpumask = 1;
 806
 807         iscsit_dec_conn_usage_count(conn);
 808
 809         return 0;
 810 }
 811
 812 static void iscsi_handle_login_thread_timeout(unsigned long data)
 813 {
 814         struct iscsi_np *np = (struct iscsi_np *) data;
 815
 816         spin_lock_bh(&np->np_thread_lock);
 817         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 818                         np->np_ip, np->np_port);
 819
 820         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 821                 spin_unlock_bh(&np->np_thread_lock);
 822                 return;
 823         }
 824
 825         if (np->np_thread)
 826                 send_sig(SIGINT, np->np_thread, 1);
 827
 828         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 829         spin_unlock_bh(&np->np_thread_lock);
 830 }
 831
 832 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 833 {
 834         /*
 835          * This used the TA_LOGIN_TIMEOUT constant because at this
 836          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 837          */
 838         spin_lock_bh(&np->np_thread_lock);
 839         init_timer(&np->np_login_timer);
 840         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 841         np->np_login_timer.data = (unsigned long)np;
 842         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 843         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 844         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 845         add_timer(&np->np_login_timer);
 846
 847         pr_debug("Added timeout timer to iSCSI login request for"
 848                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 849         spin_unlock_bh(&np->np_thread_lock);
 850 }
 851
 852 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 853 {
 854         spin_lock_bh(&np->np_thread_lock);
 855         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 856                 spin_unlock_bh(&np->np_thread_lock);
 857                 return;
 858         }
 859         np->np_login_timer_flags |= ISCSI_TF_STOP;
 860         spin_unlock_bh(&np->np_thread_lock);
 861
 862         del_timer_sync(&np->np_login_timer);
 863
 864         spin_lock_bh(&np->np_thread_lock);
 865         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 866         spin_unlock_bh(&np->np_thread_lock);
 867 }
 868
 869 int iscsit_setup_np(
 870         struct iscsi_np *np,
 871         struct __kernel_sockaddr_storage *sockaddr)
 872 {
 873         struct socket *sock = NULL;
 874         int backlog = 5, ret, opt = 0, len;
 875
 876         switch (np->np_network_transport) {
 877         case ISCSI_TCP:
 878                 np->np_ip_proto = IPPROTO_TCP;
 879                 np->np_sock_type = SOCK_STREAM;
 880                 break;
 881         case ISCSI_SCTP_TCP:
 882                 np->np_ip_proto = IPPROTO_SCTP;
 883                 np->np_sock_type = SOCK_STREAM;
 884                 break;
 885         case ISCSI_SCTP_UDP:
 886                 np->np_ip_proto = IPPROTO_SCTP;
 887                 np->np_sock_type = SOCK_SEQPACKET;
 888                 break;
 889         default:
 890                 pr_err("Unsupported network_transport: %d\n",
 891                                 np->np_network_transport);
 892                 return -EINVAL;
 893         }
 894
 895         np->np_ip_proto = IPPROTO_TCP;
 896         np->np_sock_type = SOCK_STREAM;
 897
 898         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 899                         np->np_ip_proto, &sock);
 900         if (ret < 0) {
 901                 pr_err("sock_create() failed.\n");
 902                 return ret;
 903         }
 904         np->np_socket = sock;
 905         /*
 906          * Setup the np->np_sockaddr from the passed sockaddr setup
 907          * in iscsi_target_configfs.c code..
 908          */
 909         memcpy(&np->np_sockaddr, sockaddr,
 910                         sizeof(struct __kernel_sockaddr_storage));
 911
 912         if (sockaddr->ss_family == AF_INET6)
 913                 len = sizeof(struct sockaddr_in6);
 914         else
 915                 len = sizeof(struct sockaddr_in);
 916         /*
 917          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 918          */
 919         /* FIXME: Someone please explain why this is endian-safe */
 920         opt = 1;
 921         if (np->np_network_transport == ISCSI_TCP) {
 922                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 923                                 (char *)&opt, sizeof(opt));
 924                 if (ret < 0) {
 925                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 926                                 " failed: %d\n", ret);
 927                         goto fail;
 928                 }
 929         }
 930
 931         /* FIXME: Someone please explain why this is endian-safe */
 932         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 933                         (char *)&opt, sizeof(opt));
 934         if (ret < 0) {
 935                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 936                         " failed\n");
 937                 goto fail;
 938         }
 939
 940         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 941                         (char *)&opt, sizeof(opt));
 942         if (ret < 0) {
 943                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 944                         " failed\n");
 945                 goto fail;
 946         }
 947
 948         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 949         if (ret < 0) {
 950                 pr_err("kernel_bind() failed: %d\n", ret);
 951                 goto fail;
 952         }
 953
 954         ret = kernel_listen(sock, backlog);
 955         if (ret != 0) {
 956                 pr_err("kernel_listen() failed: %d\n", ret);
 957                 goto fail;
 958         }
 959
 960         return 0;
 961 fail:
 962         np->np_socket = NULL;
 963         if (sock)
 964                 sock_release(sock);
 965         return ret;
 966 }
 967
 968 int iscsi_target_setup_login_socket(
 969         struct iscsi_np *np,
 970         struct __kernel_sockaddr_storage *sockaddr)
 971 {
 972         struct iscsit_transport *t;
 973         int rc;
 974
 975         t = iscsit_get_transport(np->np_network_transport);
 976         if (!t)
 977                 return -EINVAL;
 978
 979         rc = t->iscsit_setup_np(np, sockaddr);
 980         if (rc < 0) {
 981                 iscsit_put_transport(t);
 982                 return rc;
 983         }
 984
 985         np->np_transport = t;
 986         np->enabled = true;
 987         return 0;
 988 }
 989
 990 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 991 {
 992         struct socket *new_sock, *sock = np->np_socket;
 993         struct sockaddr_in sock_in;
 994         struct sockaddr_in6 sock_in6;
 995         int rc, err;
 996
 997         rc = kernel_accept(sock, &new_sock, 0);
 998         if (rc < 0)
 999                 return rc;
1000
1001         conn->sock = new_sock;
1002         conn->login_family = np->np_sockaddr.ss_family;
1003
1004         if (np->np_sockaddr.ss_family == AF_INET6) {
1005                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1006
1007                 rc = conn->sock->ops->getname(conn->sock,
1008                                 (struct sockaddr *)&sock_in6, &err, 1);
1009                 if (!rc) {
1010                         snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1011                                 &sock_in6.sin6_addr.in6_u);
1012                         conn->login_port = ntohs(sock_in6.sin6_port);
1013                 }
1014
1015                 rc = conn->sock->ops->getname(conn->sock,
1016                                 (struct sockaddr *)&sock_in6, &err, 0);
1017                 if (!rc) {
1018                         snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
1019                                 &sock_in6.sin6_addr.in6_u);
1020                         conn->local_port = ntohs(sock_in6.sin6_port);
1021                 }
1022         } else {
1023                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1024
1025                 rc = conn->sock->ops->getname(conn->sock,
1026                                 (struct sockaddr *)&sock_in, &err, 1);
1027                 if (!rc) {
1028                         sprintf(conn->login_ip, "%pI4",
1029                                         &sock_in.sin_addr.s_addr);
1030                         conn->login_port = ntohs(sock_in.sin_port);
1031                 }
1032
1033                 rc = conn->sock->ops->getname(conn->sock,
1034                                 (struct sockaddr *)&sock_in, &err, 0);
1035                 if (!rc) {
1036                         sprintf(conn->local_ip, "%pI4",
1037                                         &sock_in.sin_addr.s_addr);
1038                         conn->local_port = ntohs(sock_in.sin_port);
1039                 }
1040         }
1041
1042         return 0;
1043 }
1044
1045 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1046 {
1047         struct iscsi_login_req *login_req;
1048         u32 padding = 0, payload_length;
1049
1050         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1051                 return -1;
1052
1053         login_req = (struct iscsi_login_req *)login->req;
1054         payload_length  = ntoh24(login_req->dlength);
1055         padding = ((-payload_length) & 3);
1056
1057         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1058                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1059                 login_req->flags, login_req->itt, login_req->cmdsn,
1060                 login_req->exp_statsn, login_req->cid, payload_length);
1061         /*
1062          * Setup the initial iscsi_login values from the leading
1063          * login request PDU.
1064          */
1065         if (login->first_request) {
1066                 login_req = (struct iscsi_login_req *)login->req;
1067                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1068                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1069                 login->version_min      = login_req->min_version;
1070                 login->version_max      = login_req->max_version;
1071                 memcpy(login->isid, login_req->isid, 6);
1072                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1073                 login->init_task_tag    = login_req->itt;
1074                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1075                 login->cid              = be16_to_cpu(login_req->cid);
1076                 login->tsih             = be16_to_cpu(login_req->tsih);
1077         }
1078
1079         if (iscsi_target_check_login_request(conn, login) < 0)
1080                 return -1;
1081
1082         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1083         if (iscsi_login_rx_data(conn, login->req_buf,
1084                                 payload_length + padding) < 0)
1085                 return -1;
1086
1087         return 0;
1088 }
1089
1090 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1091                         u32 length)
1092 {
1093         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1094                 return -1;
1095
1096         return 0;
1097 }
1098
1099 static int
1100 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1101 {
1102         int rc;
1103
1104         if (!t->owner) {
1105                 conn->conn_transport = t;
1106                 return 0;
1107         }
1108
1109         rc = try_module_get(t->owner);
1110         if (!rc) {
1111                 pr_err("try_module_get() failed for %s\n", t->name);
1112                 return -EINVAL;
1113         }
1114
1115         conn->conn_transport = t;
1116         return 0;
1117 }
1118
1119 static int __iscsi_target_login_thread(struct iscsi_np *np)
1120 {
1121         u8 *buffer, zero_tsih = 0;
1122         int ret = 0, rc, stop;
1123         struct iscsi_conn *conn = NULL;
1124         struct iscsi_login *login;
1125         struct iscsi_portal_group *tpg = NULL;
1126         struct iscsi_login_req *pdu;
1127
1128         flush_signals(current);
1129
1130         spin_lock_bh(&np->np_thread_lock);
1131         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1132                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1133                 complete(&np->np_restart_comp);
1134         } else {
1135                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1136         }
1137         spin_unlock_bh(&np->np_thread_lock);
1138
1139         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1140         if (!conn) {
1141                 pr_err("Could not allocate memory for"
1142                         " new connection\n");
1143                 /* Get another socket */
1144                 return 1;
1145         }
1146         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1147         conn->conn_state = TARG_CONN_STATE_FREE;
1148
1149         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1150                 kfree(conn);
1151                 return 1;
1152         }
1153
1154         rc = np->np_transport->iscsit_accept_np(np, conn);
1155         if (rc == -ENOSYS) {
1156                 complete(&np->np_restart_comp);
1157                 iscsit_put_transport(conn->conn_transport);
1158                 kfree(conn);
1159                 conn = NULL;
1160                 goto exit;
1161         } else if (rc < 0) {
1162                 spin_lock_bh(&np->np_thread_lock);
1163                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1164                         spin_unlock_bh(&np->np_thread_lock);
1165                         complete(&np->np_restart_comp);
1166                         iscsit_put_transport(conn->conn_transport);
1167                         kfree(conn);
1168                         conn = NULL;
1169                         if (ret == -ENODEV)
1170                                 goto out;
1171                         /* Get another socket */
1172                         return 1;
1173                 }
1174                 spin_unlock_bh(&np->np_thread_lock);
1175                 iscsit_put_transport(conn->conn_transport);
1176                 kfree(conn);
1177                 conn = NULL;
1178                 goto out;
1179         }
1180         /*
1181          * Perform the remaining iSCSI connection initialization items..
1182          */
1183         login = iscsi_login_init_conn(conn);
1184         if (!login) {
1185                 goto new_sess_out;
1186         }
1187
1188         iscsi_start_login_thread_timer(np);
1189
1190         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1191         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1192         /*
1193          * This will process the first login request + payload..
1194          */
1195         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1196         if (rc == 1)
1197                 return 1;
1198         else if (rc < 0)
1199                 goto new_sess_out;
1200
1201         buffer = &login->req[0];
1202         pdu = (struct iscsi_login_req *)buffer;
1203         /*
1204          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1205          * when Status-Class != 0.
1206         */
1207         conn->login_itt = pdu->itt;
1208
1209         spin_lock_bh(&np->np_thread_lock);
1210         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1211                 spin_unlock_bh(&np->np_thread_lock);
1212                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1213                         " active.\n", np->np_ip, np->np_port);
1214                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1215                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1216                 goto new_sess_out;
1217         }
1218         spin_unlock_bh(&np->np_thread_lock);
1219
1220         conn->network_transport = np->np_network_transport;
1221
1222         pr_debug("Received iSCSI login request from %s on %s Network"
1223                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1224                 conn->local_ip, conn->local_port);
1225
1226         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1227         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1228
1229         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1230                         pdu->min_version) < 0)
1231                 goto new_sess_out;
1232
1233         zero_tsih = (pdu->tsih == 0x0000);
1234         if (zero_tsih) {
1235                 /*
1236                  * This is the leading connection of a new session.
1237                  * We wait until after authentication to check for
1238                  * session reinstatement.
1239                  */
1240                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1241                         goto new_sess_out;
1242         } else {
1243                 /*
1244                  * Add a new connection to an existing session.
1245                  * We check for a non-existant session in
1246                  * iscsi_login_non_zero_tsih_s2() below based
1247                  * on ISID/TSIH, but wait until after authentication
1248                  * to check for connection reinstatement, etc.
1249                  */
1250                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1251                         goto new_sess_out;
1252         }
1253         /*
1254          * SessionType: Discovery
1255          *
1256          *      Locates Default Portal
1257          *
1258          * SessionType: Normal
1259          *
1260          *      Locates Target Portal from NP -> Target IQN
1261          */
1262         rc = iscsi_target_locate_portal(np, conn, login);
1263         if (rc < 0) {
1264                 tpg = conn->tpg;
1265                 goto new_sess_out;
1266         }
1267
1268         tpg = conn->tpg;
1269         if (!tpg) {
1270                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1271                 goto new_sess_out;
1272         }
1273
1274         if (zero_tsih) {
1275                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1276                         goto new_sess_out;
1277         } else {
1278                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1279                         goto old_sess_out;
1280         }
1281
1282         if (iscsi_target_start_negotiation(login, conn) < 0)
1283                 goto new_sess_out;
1284
1285         if (!conn->sess) {
1286                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1287                 goto new_sess_out;
1288         }
1289
1290         iscsi_stop_login_thread_timer(np);
1291
1292         if (signal_pending(current))
1293                 goto new_sess_out;
1294
1295         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1296
1297         if (ret < 0)
1298                 goto new_sess_out;
1299
1300         iscsit_deaccess_np(np, tpg);
1301         tpg = NULL;
1302         /* Get another socket */
1303         return 1;
1304
1305 new_sess_out:
1306         pr_err("iSCSI Login negotiation failed.\n");
1307         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1308                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1309         if (!zero_tsih || !conn->sess)
1310                 goto old_sess_out;
1311         if (conn->sess->se_sess)
1312                 transport_free_session(conn->sess->se_sess);
1313         if (conn->sess->session_index != 0) {
1314                 spin_lock_bh(&sess_idr_lock);
1315                 idr_remove(&sess_idr, conn->sess->session_index);
1316                 spin_unlock_bh(&sess_idr_lock);
1317         }
1318         kfree(conn->sess->sess_ops);
1319         kfree(conn->sess);
1320 old_sess_out:
1321         iscsi_stop_login_thread_timer(np);
1322         /*
1323          * If login negotiation fails check if the Time2Retain timer
1324          * needs to be restarted.
1325          */
1326         if (!zero_tsih && conn->sess) {
1327                 spin_lock_bh(&conn->sess->conn_lock);
1328                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1329                         struct se_portal_group *se_tpg =
1330                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1331
1332                         atomic_set(&conn->sess->session_continuation, 0);
1333                         spin_unlock_bh(&conn->sess->conn_lock);
1334                         spin_lock_bh(&se_tpg->session_lock);
1335                         iscsit_start_time2retain_handler(conn->sess);
1336                         spin_unlock_bh(&se_tpg->session_lock);
1337                 } else
1338                         spin_unlock_bh(&conn->sess->conn_lock);
1339                 iscsit_dec_session_usage_count(conn->sess);
1340         }
1341
1342         if (!IS_ERR(conn->conn_rx_hash.tfm))
1343                 crypto_free_hash(conn->conn_rx_hash.tfm);
1344         if (!IS_ERR(conn->conn_tx_hash.tfm))
1345                 crypto_free_hash(conn->conn_tx_hash.tfm);
1346
1347         if (conn->conn_cpumask)
1348                 free_cpumask_var(conn->conn_cpumask);
1349
1350         kfree(conn->conn_ops);
1351
1352         if (conn->param_list) {
1353                 iscsi_release_param_list(conn->param_list);
1354                 conn->param_list = NULL;
1355         }
1356         iscsi_target_nego_release(conn);
1357
1358         if (conn->sock) {
1359                 sock_release(conn->sock);
1360                 conn->sock = NULL;
1361         }
1362
1363         if (conn->conn_transport->iscsit_free_conn)
1364                 conn->conn_transport->iscsit_free_conn(conn);
1365
1366         iscsit_put_transport(conn->conn_transport);
1367
1368         kfree(conn);
1369
1370         if (tpg) {
1371                 iscsit_deaccess_np(np, tpg);
1372                 tpg = NULL;
1373         }
1374
1375 out:
1376         stop = kthread_should_stop();
1377         if (!stop && signal_pending(current)) {
1378                 spin_lock_bh(&np->np_thread_lock);
1379                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1380                 spin_unlock_bh(&np->np_thread_lock);
1381         }
1382         /* Wait for another socket.. */
1383         if (!stop)
1384                 return 1;
1385 exit:
1386         iscsi_stop_login_thread_timer(np);
1387         spin_lock_bh(&np->np_thread_lock);
1388         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1389         np->np_thread = NULL;
1390         spin_unlock_bh(&np->np_thread_lock);
1391
1392         return 0;
1393 }
1394
1395 int iscsi_target_login_thread(void *arg)
1396 {
1397         struct iscsi_np *np = arg;
1398         int ret;
1399
1400         allow_signal(SIGINT);
1401
1402         while (!kthread_should_stop()) {
1403                 ret = __iscsi_target_login_thread(np);
1404                 /*
1405                  * We break and exit here unless another sock_accept() call
1406                  * is expected.
1407                  */
1408                 if (ret != 1)
1409                         break;
1410         }
1411
1412         return 0;
1413 }