drivers/target/iscsi/iscsi_target_login.c

   1 /*******************************************************************************
   2  * This file contains the login functions used by the iSCSI Target driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/idr.h>
  23 #include <scsi/iscsi_proto.h>
  24 #include <target/target_core_base.h>
  25 #include <target/target_core_fabric.h>
  26
  27 #include "iscsi_target_core.h"
  28 #include "iscsi_target_tq.h"
  29 #include "iscsi_target_device.h"
  30 #include "iscsi_target_nego.h"
  31 #include "iscsi_target_erl0.h"
  32 #include "iscsi_target_erl2.h"
  33 #include "iscsi_target_login.h"
  34 #include "iscsi_target_stat.h"
  35 #include "iscsi_target_tpg.h"
  36 #include "iscsi_target_util.h"
  37 #include "iscsi_target.h"
  38 #include "iscsi_target_parameters.h"
  39
  40 #include <target/iscsi/iscsi_transport.h>
  41
  42 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  43 {
  44         struct iscsi_login *login;
  45
  46         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  47         if (!login) {
  48                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  49                 return NULL;
  50         }
  51         conn->login = login;
  52         login->conn = conn;
  53         login->first_request = 1;
  54
  55         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  56         if (!login->req_buf) {
  57                 pr_err("Unable to allocate memory for response buffer.\n");
  58                 goto out_login;
  59         }
  60
  61         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  62         if (!login->rsp_buf) {
  63                 pr_err("Unable to allocate memory for request buffer.\n");
  64                 goto out_req_buf;
  65         }
  66
  67         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  68         if (!conn->conn_ops) {
  69                 pr_err("Unable to allocate memory for"
  70                         " struct iscsi_conn_ops.\n");
  71                 goto out_rsp_buf;
  72         }
  73
  74         init_waitqueue_head(&conn->queues_wq);
  75         INIT_LIST_HEAD(&conn->conn_list);
  76         INIT_LIST_HEAD(&conn->conn_cmd_list);
  77         INIT_LIST_HEAD(&conn->immed_queue_list);
  78         INIT_LIST_HEAD(&conn->response_queue_list);
  79         init_completion(&conn->conn_post_wait_comp);
  80         init_completion(&conn->conn_wait_comp);
  81         init_completion(&conn->conn_wait_rcfr_comp);
  82         init_completion(&conn->conn_waiting_on_uc_comp);
  83         init_completion(&conn->conn_logout_comp);
  84         init_completion(&conn->rx_half_close_comp);
  85         init_completion(&conn->tx_half_close_comp);
  86         spin_lock_init(&conn->cmd_lock);
  87         spin_lock_init(&conn->conn_usage_lock);
  88         spin_lock_init(&conn->immed_queue_lock);
  89         spin_lock_init(&conn->nopin_timer_lock);
  90         spin_lock_init(&conn->response_queue_lock);
  91         spin_lock_init(&conn->state_lock);
  92
  93         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  94                 pr_err("Unable to allocate conn->conn_cpumask\n");
  95                 goto out_conn_ops;
  96         }
  97         conn->conn_login = login;
  98
  99         return login;
 100
 101 out_conn_ops:
 102         kfree(conn->conn_ops);
 103 out_rsp_buf:
 104         kfree(login->rsp_buf);
 105 out_req_buf:
 106         kfree(login->req_buf);
 107 out_login:
 108         kfree(login);
 109         return NULL;
 110 }
 111
 112 /*
 113  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 114  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 115  */
 116 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 117 {
 118         /*
 119          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 120          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 121          * to software 1x8 byte slicing from crc32c.ko
 122          */
 123         conn->conn_rx_hash.flags = 0;
 124         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 125                                                 CRYPTO_ALG_ASYNC);
 126         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 127                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 128                 return -ENOMEM;
 129         }
 130
 131         conn->conn_tx_hash.flags = 0;
 132         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 133                                                 CRYPTO_ALG_ASYNC);
 134         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 135                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 136                 crypto_free_hash(conn->conn_rx_hash.tfm);
 137                 return -ENOMEM;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int iscsi_login_check_initiator_version(
 144         struct iscsi_conn *conn,
 145         u8 version_max,
 146         u8 version_min)
 147 {
 148         if ((version_max != 0x00) || (version_min != 0x00)) {
 149                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 150                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 151                         version_min, version_max);
 152                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 153                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 154                 return -1;
 155         }
 156
 157         return 0;
 158 }
 159
 160 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 161 {
 162         int sessiontype;
 163         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 164         struct iscsi_portal_group *tpg = conn->tpg;
 165         struct iscsi_session *sess = NULL, *sess_p = NULL;
 166         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 167         struct se_session *se_sess, *se_sess_tmp;
 168
 169         initiatorname_param = iscsi_find_param_from_key(
 170                         INITIATORNAME, conn->param_list);
 171         sessiontype_param = iscsi_find_param_from_key(
 172                         SESSIONTYPE, conn->param_list);
 173         if (!initiatorname_param || !sessiontype_param) {
 174                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 175                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 176                 return -1;
 177         }
 178
 179         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 180
 181         spin_lock_bh(&se_tpg->session_lock);
 182         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 183                         sess_list) {
 184
 185                 sess_p = se_sess->fabric_sess_ptr;
 186                 spin_lock(&sess_p->conn_lock);
 187                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 188                     atomic_read(&sess_p->session_logout) ||
 189                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 190                         spin_unlock(&sess_p->conn_lock);
 191                         continue;
 192                 }
 193                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 194                    (!strcmp(sess_p->sess_ops->InitiatorName,
 195                             initiatorname_param->value) &&
 196                    (sess_p->sess_ops->SessionType == sessiontype))) {
 197                         atomic_set(&sess_p->session_reinstatement, 1);
 198                         spin_unlock(&sess_p->conn_lock);
 199                         iscsit_inc_session_usage_count(sess_p);
 200                         iscsit_stop_time2retain_timer(sess_p);
 201                         sess = sess_p;
 202                         break;
 203                 }
 204                 spin_unlock(&sess_p->conn_lock);
 205         }
 206         spin_unlock_bh(&se_tpg->session_lock);
 207         /*
 208          * If the Time2Retain handler has expired, the session is already gone.
 209          */
 210         if (!sess)
 211                 return 0;
 212
 213         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 214                 " preforming session reinstatement.\n", (sessiontype) ?
 215                 "Discovery" : "Normal", sess->sid,
 216                 sess->sess_ops->InitiatorName);
 217
 218         spin_lock_bh(&sess->conn_lock);
 219         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 220                 spin_unlock_bh(&sess->conn_lock);
 221                 iscsit_dec_session_usage_count(sess);
 222                 target_put_session(sess->se_sess);
 223                 return 0;
 224         }
 225         spin_unlock_bh(&sess->conn_lock);
 226
 227         iscsit_stop_session(sess, 1, 1);
 228         iscsit_dec_session_usage_count(sess);
 229
 230         target_put_session(sess->se_sess);
 231         return 0;
 232 }
 233
 234 static void iscsi_login_set_conn_values(
 235         struct iscsi_session *sess,
 236         struct iscsi_conn *conn,
 237         __be16 cid)
 238 {
 239         conn->sess              = sess;
 240         conn->cid               = be16_to_cpu(cid);
 241         /*
 242          * Generate a random Status sequence number (statsn) for the new
 243          * iSCSI connection.
 244          */
 245         get_random_bytes(&conn->stat_sn, sizeof(u32));
 246
 247         mutex_lock(&auth_id_lock);
 248         conn->auth_id           = iscsit_global->auth_id++;
 249         mutex_unlock(&auth_id_lock);
 250 }
 251
 252 /*
 253  *      This is the leading connection of a new session,
 254  *      or session reinstatement.
 255  */
 256 static int iscsi_login_zero_tsih_s1(
 257         struct iscsi_conn *conn,
 258         unsigned char *buf)
 259 {
 260         struct iscsi_session *sess = NULL;
 261         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 262         int ret;
 263
 264         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 265         if (!sess) {
 266                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 267                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 268                 pr_err("Could not allocate memory for session\n");
 269                 return -ENOMEM;
 270         }
 271
 272         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 273         sess->init_task_tag     = pdu->itt;
 274         memcpy(&sess->isid, pdu->isid, 6);
 275         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 276         INIT_LIST_HEAD(&sess->sess_conn_list);
 277         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 278         INIT_LIST_HEAD(&sess->cr_active_list);
 279         INIT_LIST_HEAD(&sess->cr_inactive_list);
 280         init_completion(&sess->async_msg_comp);
 281         init_completion(&sess->reinstatement_comp);
 282         init_completion(&sess->session_wait_comp);
 283         init_completion(&sess->session_waiting_on_uc_comp);
 284         mutex_init(&sess->cmdsn_mutex);
 285         spin_lock_init(&sess->conn_lock);
 286         spin_lock_init(&sess->cr_a_lock);
 287         spin_lock_init(&sess->cr_i_lock);
 288         spin_lock_init(&sess->session_usage_lock);
 289         spin_lock_init(&sess->ttt_lock);
 290
 291         idr_preload(GFP_KERNEL);
 292         spin_lock_bh(&sess_idr_lock);
 293         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 294         if (ret >= 0)
 295                 sess->session_index = ret;
 296         spin_unlock_bh(&sess_idr_lock);
 297         idr_preload_end();
 298
 299         if (ret < 0) {
 300                 pr_err("idr_alloc() for sess_idr failed\n");
 301                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 302                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 303                 kfree(sess);
 304                 return -ENOMEM;
 305         }
 306
 307         sess->creation_time = get_jiffies_64();
 308         spin_lock_init(&sess->session_stats_lock);
 309         /*
 310          * The FFP CmdSN window values will be allocated from the TPG's
 311          * Initiator Node's ACL once the login has been successfully completed.
 312          */
 313         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 314
 315         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 316         if (!sess->sess_ops) {
 317                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 318                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 319                 pr_err("Unable to allocate memory for"
 320                                 " struct iscsi_sess_ops.\n");
 321                 kfree(sess);
 322                 return -ENOMEM;
 323         }
 324
 325         sess->se_sess = transport_init_session();
 326         if (IS_ERR(sess->se_sess)) {
 327                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 328                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 329                 kfree(sess);
 330                 return -ENOMEM;
 331         }
 332
 333         return 0;
 334 }
 335
 336 static int iscsi_login_zero_tsih_s2(
 337         struct iscsi_conn *conn)
 338 {
 339         struct iscsi_node_attrib *na;
 340         struct iscsi_session *sess = conn->sess;
 341         unsigned char buf[32];
 342         bool iser = false;
 343
 344         sess->tpg = conn->tpg;
 345
 346         /*
 347          * Assign a new TPG Session Handle.  Note this is protected with
 348          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 349          */
 350         sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 351         if (!sess->tsih)
 352                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 353
 354         /*
 355          * Create the default params from user defined values..
 356          */
 357         if (iscsi_copy_param_list(&conn->param_list,
 358                                 ISCSI_TPG_C(conn)->param_list, 1) < 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 (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 365                 iser = true;
 366
 367         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 368
 369         if (sess->sess_ops->SessionType)
 370                 return iscsi_set_keys_irrelevant_for_discovery(
 371                                 conn->param_list);
 372
 373         na = iscsit_tpg_get_node_attrib(sess);
 374
 375         /*
 376          * Need to send TargetPortalGroupTag back in first login response
 377          * on any iSCSI connection where the Initiator provides TargetName.
 378          * See 5.3.1.  Login Phase Start
 379          *
 380          * In our case, we have already located the struct iscsi_tiqn at this point.
 381          */
 382         memset(buf, 0, 32);
 383         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 384         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 385                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 386                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 387                 return -1;
 388         }
 389
 390         /*
 391          * Workaround for Initiators that have broken connection recovery logic.
 392          *
 393          * "We would really like to get rid of this." Linux-iSCSI.org team
 394          */
 395         memset(buf, 0, 32);
 396         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 397         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 398                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 399                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 400                 return -1;
 401         }
 402
 403         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 404                 return -1;
 405         /*
 406          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 407          */
 408         if (iser) {
 409                 struct iscsi_param *param;
 410                 unsigned long mrdsl, off;
 411                 int rc;
 412
 413                 sprintf(buf, "RDMAExtensions=Yes");
 414                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 415                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 416                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 417                         return -1;
 418                 }
 419                 /*
 420                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 421                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 422                  */
 423                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 424                                                   conn->param_list);
 425                 if (!param) {
 426                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 427                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 428                         return -1;
 429                 }
 430                 rc = kstrtoul(param->value, 0, &mrdsl);
 431                 if (rc < 0) {
 432                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 433                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 434                         return -1;
 435                 }
 436                 off = mrdsl % PAGE_SIZE;
 437                 if (!off)
 438                         return 0;
 439
 440                 if (mrdsl < PAGE_SIZE)
 441                         mrdsl = PAGE_SIZE;
 442                 else
 443                         mrdsl -= off;
 444
 445                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 446                         " to PAGE_SIZE\n", mrdsl);
 447
 448                 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
 449                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 450                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 451                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 452                         return -1;
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459 /*
 460  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 461  * The Initiator node will be able to enable FIM by proposing them itself.
 462  */
 463 int iscsi_login_disable_FIM_keys(
 464         struct iscsi_param_list *param_list,
 465         struct iscsi_conn *conn)
 466 {
 467         struct iscsi_param *param;
 468
 469         param = iscsi_find_param_from_key("OFMarker", param_list);
 470         if (!param) {
 471                 pr_err("iscsi_find_param_from_key() for"
 472                                 " OFMarker failed\n");
 473                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 474                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 475                 return -1;
 476         }
 477         param->state &= ~PSTATE_NEGOTIATE;
 478
 479         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 480         if (!param) {
 481                 pr_err("iscsi_find_param_from_key() for"
 482                                 " IFMarker failed\n");
 483                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 484                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 485                 return -1;
 486         }
 487         param->state &= ~PSTATE_NEGOTIATE;
 488
 489         param = iscsi_find_param_from_key("IFMarker", param_list);
 490         if (!param) {
 491                 pr_err("iscsi_find_param_from_key() for"
 492                                 " IFMarker failed\n");
 493                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 494                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 495                 return -1;
 496         }
 497         param->state &= ~PSTATE_NEGOTIATE;
 498
 499         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 500         if (!param) {
 501                 pr_err("iscsi_find_param_from_key() for"
 502                                 " IFMarker failed\n");
 503                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 504                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 505                 return -1;
 506         }
 507         param->state &= ~PSTATE_NEGOTIATE;
 508
 509         return 0;
 510 }
 511
 512 static int iscsi_login_non_zero_tsih_s1(
 513         struct iscsi_conn *conn,
 514         unsigned char *buf)
 515 {
 516         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 517
 518         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 519         return 0;
 520 }
 521
 522 /*
 523  *      Add a new connection to an existing session.
 524  */
 525 static int iscsi_login_non_zero_tsih_s2(
 526         struct iscsi_conn *conn,
 527         unsigned char *buf)
 528 {
 529         struct iscsi_portal_group *tpg = conn->tpg;
 530         struct iscsi_session *sess = NULL, *sess_p = NULL;
 531         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 532         struct se_session *se_sess, *se_sess_tmp;
 533         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 534         bool iser = false;
 535
 536         spin_lock_bh(&se_tpg->session_lock);
 537         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 538                         sess_list) {
 539
 540                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 541                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 542                     atomic_read(&sess_p->session_logout) ||
 543                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 544                         continue;
 545                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 546                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 547                         iscsit_inc_session_usage_count(sess_p);
 548                         iscsit_stop_time2retain_timer(sess_p);
 549                         sess = sess_p;
 550                         break;
 551                 }
 552         }
 553         spin_unlock_bh(&se_tpg->session_lock);
 554
 555         /*
 556          * If the Time2Retain handler has expired, the session is already gone.
 557          */
 558         if (!sess) {
 559                 pr_err("Initiator attempting to add a connection to"
 560                         " a non-existent session, rejecting iSCSI Login.\n");
 561                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 562                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 563                 return -1;
 564         }
 565
 566         /*
 567          * Stop the Time2Retain timer if this is a failed session, we restart
 568          * the timer if the login is not successful.
 569          */
 570         spin_lock_bh(&sess->conn_lock);
 571         if (sess->session_state == TARG_SESS_STATE_FAILED)
 572                 atomic_set(&sess->session_continuation, 1);
 573         spin_unlock_bh(&sess->conn_lock);
 574
 575         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 576
 577         if (iscsi_copy_param_list(&conn->param_list,
 578                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 579                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 580                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 581                 return -1;
 582         }
 583
 584         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 585                 iser = true;
 586
 587         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 588         /*
 589          * Need to send TargetPortalGroupTag back in first login response
 590          * on any iSCSI connection where the Initiator provides TargetName.
 591          * See 5.3.1.  Login Phase Start
 592          *
 593          * In our case, we have already located the struct iscsi_tiqn at this point.
 594          */
 595         memset(buf, 0, 32);
 596         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 597         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 598                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 599                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 600                 return -1;
 601         }
 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 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 = ISCSIT_TCP_BACKLOG, 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         return 0;
 987 }
 988
 989 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 990 {
 991         struct socket *new_sock, *sock = np->np_socket;
 992         struct sockaddr_in sock_in;
 993         struct sockaddr_in6 sock_in6;
 994         int rc, err;
 995
 996         rc = kernel_accept(sock, &new_sock, 0);
 997         if (rc < 0)
 998                 return rc;
 999
1000         conn->sock = new_sock;
1001         conn->login_family = np->np_sockaddr.ss_family;
1002
1003         if (np->np_sockaddr.ss_family == AF_INET6) {
1004                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1005
1006                 rc = conn->sock->ops->getname(conn->sock,
1007                                 (struct sockaddr *)&sock_in6, &err, 1);
1008                 if (!rc) {
1009                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1010                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1011                                         &sock_in6.sin6_addr.in6_u);
1012                         else
1013                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1014                                         &sock_in6.sin6_addr.s6_addr32[3]);
1015                         conn->login_port = ntohs(sock_in6.sin6_port);
1016                 }
1017
1018                 rc = conn->sock->ops->getname(conn->sock,
1019                                 (struct sockaddr *)&sock_in6, &err, 0);
1020                 if (!rc) {
1021                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1022                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1023                                         &sock_in6.sin6_addr.in6_u);
1024                         else
1025                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1026                                         &sock_in6.sin6_addr.s6_addr32[3]);
1027                         conn->local_port = ntohs(sock_in6.sin6_port);
1028                 }
1029         } else {
1030                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1031
1032                 rc = conn->sock->ops->getname(conn->sock,
1033                                 (struct sockaddr *)&sock_in, &err, 1);
1034                 if (!rc) {
1035                         sprintf(conn->login_ip, "%pI4",
1036                                         &sock_in.sin_addr.s_addr);
1037                         conn->login_port = ntohs(sock_in.sin_port);
1038                 }
1039
1040                 rc = conn->sock->ops->getname(conn->sock,
1041                                 (struct sockaddr *)&sock_in, &err, 0);
1042                 if (!rc) {
1043                         sprintf(conn->local_ip, "%pI4",
1044                                         &sock_in.sin_addr.s_addr);
1045                         conn->local_port = ntohs(sock_in.sin_port);
1046                 }
1047         }
1048
1049         return 0;
1050 }
1051
1052 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1053 {
1054         struct iscsi_login_req *login_req;
1055         u32 padding = 0, payload_length;
1056
1057         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1058                 return -1;
1059
1060         login_req = (struct iscsi_login_req *)login->req;
1061         payload_length  = ntoh24(login_req->dlength);
1062         padding = ((-payload_length) & 3);
1063
1064         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1065                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1066                 login_req->flags, login_req->itt, login_req->cmdsn,
1067                 login_req->exp_statsn, login_req->cid, payload_length);
1068         /*
1069          * Setup the initial iscsi_login values from the leading
1070          * login request PDU.
1071          */
1072         if (login->first_request) {
1073                 login_req = (struct iscsi_login_req *)login->req;
1074                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1075                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1076                 login->version_min      = login_req->min_version;
1077                 login->version_max      = login_req->max_version;
1078                 memcpy(login->isid, login_req->isid, 6);
1079                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1080                 login->init_task_tag    = login_req->itt;
1081                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1082                 login->cid              = be16_to_cpu(login_req->cid);
1083                 login->tsih             = be16_to_cpu(login_req->tsih);
1084         }
1085
1086         if (iscsi_target_check_login_request(conn, login) < 0)
1087                 return -1;
1088
1089         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1090         if (iscsi_login_rx_data(conn, login->req_buf,
1091                                 payload_length + padding) < 0)
1092                 return -1;
1093
1094         return 0;
1095 }
1096
1097 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1098                         u32 length)
1099 {
1100         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1101                 return -1;
1102
1103         return 0;
1104 }
1105
1106 static int
1107 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1108 {
1109         int rc;
1110
1111         if (!t->owner) {
1112                 conn->conn_transport = t;
1113                 return 0;
1114         }
1115
1116         rc = try_module_get(t->owner);
1117         if (!rc) {
1118                 pr_err("try_module_get() failed for %s\n", t->name);
1119                 return -EINVAL;
1120         }
1121
1122         conn->conn_transport = t;
1123         return 0;
1124 }
1125
1126 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1127                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1128 {
1129         if (new_sess == false)
1130                 goto old_sess_out;
1131
1132         pr_err("iSCSI Login negotiation failed.\n");
1133         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1134                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1135         if (!zero_tsih || !conn->sess)
1136                 goto old_sess_out;
1137         if (conn->sess->se_sess)
1138                 transport_free_session(conn->sess->se_sess);
1139         if (conn->sess->session_index != 0) {
1140                 spin_lock_bh(&sess_idr_lock);
1141                 idr_remove(&sess_idr, conn->sess->session_index);
1142                 spin_unlock_bh(&sess_idr_lock);
1143         }
1144         kfree(conn->sess->sess_ops);
1145         kfree(conn->sess);
1146
1147 old_sess_out:
1148         iscsi_stop_login_thread_timer(np);
1149         /*
1150          * If login negotiation fails check if the Time2Retain timer
1151          * needs to be restarted.
1152          */
1153         if (!zero_tsih && conn->sess) {
1154                 spin_lock_bh(&conn->sess->conn_lock);
1155                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1156                         struct se_portal_group *se_tpg =
1157                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1158
1159                         atomic_set(&conn->sess->session_continuation, 0);
1160                         spin_unlock_bh(&conn->sess->conn_lock);
1161                         spin_lock_bh(&se_tpg->session_lock);
1162                         iscsit_start_time2retain_handler(conn->sess);
1163                         spin_unlock_bh(&se_tpg->session_lock);
1164                 } else
1165                         spin_unlock_bh(&conn->sess->conn_lock);
1166                 iscsit_dec_session_usage_count(conn->sess);
1167         }
1168
1169         if (!IS_ERR(conn->conn_rx_hash.tfm))
1170                 crypto_free_hash(conn->conn_rx_hash.tfm);
1171         if (!IS_ERR(conn->conn_tx_hash.tfm))
1172                 crypto_free_hash(conn->conn_tx_hash.tfm);
1173
1174         if (conn->conn_cpumask)
1175                 free_cpumask_var(conn->conn_cpumask);
1176
1177         kfree(conn->conn_ops);
1178
1179         if (conn->param_list) {
1180                 iscsi_release_param_list(conn->param_list);
1181                 conn->param_list = NULL;
1182         }
1183         iscsi_target_nego_release(conn);
1184
1185         if (conn->sock) {
1186                 sock_release(conn->sock);
1187                 conn->sock = NULL;
1188         }
1189
1190         if (conn->conn_transport->iscsit_free_conn)
1191                 conn->conn_transport->iscsit_free_conn(conn);
1192
1193         iscsit_put_transport(conn->conn_transport);
1194         kfree(conn);
1195 }
1196
1197 static int __iscsi_target_login_thread(struct iscsi_np *np)
1198 {
1199         u8 *buffer, zero_tsih = 0;
1200         int ret = 0, rc, stop;
1201         struct iscsi_conn *conn = NULL;
1202         struct iscsi_login *login;
1203         struct iscsi_portal_group *tpg = NULL;
1204         struct iscsi_login_req *pdu;
1205         struct iscsi_tpg_np *tpg_np;
1206         bool new_sess = false;
1207
1208         flush_signals(current);
1209
1210         spin_lock_bh(&np->np_thread_lock);
1211         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1212                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1213                 complete(&np->np_restart_comp);
1214         } else {
1215                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1216         }
1217         spin_unlock_bh(&np->np_thread_lock);
1218
1219         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1220         if (!conn) {
1221                 pr_err("Could not allocate memory for"
1222                         " new connection\n");
1223                 /* Get another socket */
1224                 return 1;
1225         }
1226         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1227         conn->conn_state = TARG_CONN_STATE_FREE;
1228
1229         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1230                 kfree(conn);
1231                 return 1;
1232         }
1233
1234         rc = np->np_transport->iscsit_accept_np(np, conn);
1235         if (rc == -ENOSYS) {
1236                 complete(&np->np_restart_comp);
1237                 iscsit_put_transport(conn->conn_transport);
1238                 kfree(conn);
1239                 conn = NULL;
1240                 goto exit;
1241         } else if (rc < 0) {
1242                 spin_lock_bh(&np->np_thread_lock);
1243                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1244                         spin_unlock_bh(&np->np_thread_lock);
1245                         complete(&np->np_restart_comp);
1246                         iscsit_put_transport(conn->conn_transport);
1247                         kfree(conn);
1248                         conn = NULL;
1249                         if (ret == -ENODEV)
1250                                 goto out;
1251                         /* Get another socket */
1252                         return 1;
1253                 }
1254                 spin_unlock_bh(&np->np_thread_lock);
1255                 iscsit_put_transport(conn->conn_transport);
1256                 kfree(conn);
1257                 conn = NULL;
1258                 goto out;
1259         }
1260         /*
1261          * Perform the remaining iSCSI connection initialization items..
1262          */
1263         login = iscsi_login_init_conn(conn);
1264         if (!login) {
1265                 goto new_sess_out;
1266         }
1267
1268         iscsi_start_login_thread_timer(np);
1269
1270         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1271         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1272         /*
1273          * This will process the first login request + payload..
1274          */
1275         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1276         if (rc == 1)
1277                 return 1;
1278         else if (rc < 0)
1279                 goto new_sess_out;
1280
1281         buffer = &login->req[0];
1282         pdu = (struct iscsi_login_req *)buffer;
1283         /*
1284          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1285          * when Status-Class != 0.
1286         */
1287         conn->login_itt = pdu->itt;
1288
1289         spin_lock_bh(&np->np_thread_lock);
1290         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1291                 spin_unlock_bh(&np->np_thread_lock);
1292                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1293                         " active.\n", np->np_ip, np->np_port);
1294                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1295                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1296                 goto new_sess_out;
1297         }
1298         spin_unlock_bh(&np->np_thread_lock);
1299
1300         conn->network_transport = np->np_network_transport;
1301
1302         pr_debug("Received iSCSI login request from %s on %s Network"
1303                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1304                 conn->local_ip, conn->local_port);
1305
1306         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1307         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1308
1309         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1310                         pdu->min_version) < 0)
1311                 goto new_sess_out;
1312
1313         zero_tsih = (pdu->tsih == 0x0000);
1314         if (zero_tsih) {
1315                 /*
1316                  * This is the leading connection of a new session.
1317                  * We wait until after authentication to check for
1318                  * session reinstatement.
1319                  */
1320                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1321                         goto new_sess_out;
1322         } else {
1323                 /*
1324                  * Add a new connection to an existing session.
1325                  * We check for a non-existant session in
1326                  * iscsi_login_non_zero_tsih_s2() below based
1327                  * on ISID/TSIH, but wait until after authentication
1328                  * to check for connection reinstatement, etc.
1329                  */
1330                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1331                         goto new_sess_out;
1332         }
1333         /*
1334          * SessionType: Discovery
1335          *
1336          *      Locates Default Portal
1337          *
1338          * SessionType: Normal
1339          *
1340          *      Locates Target Portal from NP -> Target IQN
1341          */
1342         rc = iscsi_target_locate_portal(np, conn, login);
1343         if (rc < 0) {
1344                 tpg = conn->tpg;
1345                 goto new_sess_out;
1346         }
1347         login->zero_tsih = zero_tsih;
1348
1349         tpg = conn->tpg;
1350         if (!tpg) {
1351                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1352                 goto new_sess_out;
1353         }
1354
1355         if (zero_tsih) {
1356                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1357                         goto new_sess_out;
1358         } else {
1359                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1360                         goto old_sess_out;
1361         }
1362
1363         ret = iscsi_target_start_negotiation(login, conn);
1364         if (ret < 0)
1365                 goto new_sess_out;
1366
1367         if (!conn->sess) {
1368                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1369                 goto new_sess_out;
1370         }
1371
1372         iscsi_stop_login_thread_timer(np);
1373
1374         if (signal_pending(current))
1375                 goto new_sess_out;
1376
1377         if (ret == 1) {
1378                 tpg_np = conn->tpg_np;
1379
1380                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1381                 if (ret < 0)
1382                         goto new_sess_out;
1383
1384                 iscsit_deaccess_np(np, tpg, tpg_np);
1385         }
1386
1387         tpg = NULL;
1388         tpg_np = NULL;
1389         /* Get another socket */
1390         return 1;
1391
1392 new_sess_out:
1393         new_sess = true;
1394 old_sess_out:
1395         tpg_np = conn->tpg_np;
1396         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1397         new_sess = false;
1398
1399         if (tpg) {
1400                 iscsit_deaccess_np(np, tpg, tpg_np);
1401                 tpg = NULL;
1402                 tpg_np = NULL;
1403         }
1404
1405 out:
1406         stop = kthread_should_stop();
1407         if (!stop && signal_pending(current)) {
1408                 spin_lock_bh(&np->np_thread_lock);
1409                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1410                 spin_unlock_bh(&np->np_thread_lock);
1411         }
1412         /* Wait for another socket.. */
1413         if (!stop)
1414                 return 1;
1415 exit:
1416         iscsi_stop_login_thread_timer(np);
1417         spin_lock_bh(&np->np_thread_lock);
1418         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1419         np->np_thread = NULL;
1420         spin_unlock_bh(&np->np_thread_lock);
1421
1422         return 0;
1423 }
1424
1425 int iscsi_target_login_thread(void *arg)
1426 {
1427         struct iscsi_np *np = arg;
1428         int ret;
1429
1430         allow_signal(SIGINT);
1431
1432         while (!kthread_should_stop()) {
1433                 ret = __iscsi_target_login_thread(np);
1434                 /*
1435                  * We break and exit here unless another sock_accept() call
1436                  * is expected.
1437                  */
1438                 if (ret != 1)
1439                         break;
1440         }
1441
1442         return 0;
1443 }