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         enum target_prot_op sup_pro_ops;
 263         int ret;
 264
 265         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 266         if (!sess) {
 267                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 268                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 269                 pr_err("Could not allocate memory for session\n");
 270                 return -ENOMEM;
 271         }
 272
 273         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 274         sess->init_task_tag     = pdu->itt;
 275         memcpy(&sess->isid, pdu->isid, 6);
 276         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 277         INIT_LIST_HEAD(&sess->sess_conn_list);
 278         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 279         INIT_LIST_HEAD(&sess->cr_active_list);
 280         INIT_LIST_HEAD(&sess->cr_inactive_list);
 281         init_completion(&sess->async_msg_comp);
 282         init_completion(&sess->reinstatement_comp);
 283         init_completion(&sess->session_wait_comp);
 284         init_completion(&sess->session_waiting_on_uc_comp);
 285         mutex_init(&sess->cmdsn_mutex);
 286         spin_lock_init(&sess->conn_lock);
 287         spin_lock_init(&sess->cr_a_lock);
 288         spin_lock_init(&sess->cr_i_lock);
 289         spin_lock_init(&sess->session_usage_lock);
 290         spin_lock_init(&sess->ttt_lock);
 291
 292         idr_preload(GFP_KERNEL);
 293         spin_lock_bh(&sess_idr_lock);
 294         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 295         if (ret >= 0)
 296                 sess->session_index = ret;
 297         spin_unlock_bh(&sess_idr_lock);
 298         idr_preload_end();
 299
 300         if (ret < 0) {
 301                 pr_err("idr_alloc() for sess_idr failed\n");
 302                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 303                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 304                 kfree(sess);
 305                 return -ENOMEM;
 306         }
 307
 308         sess->creation_time = get_jiffies_64();
 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         sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
 325
 326         sess->se_sess = transport_init_session(sup_pro_ops);
 327         if (IS_ERR(sess->se_sess)) {
 328                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 329                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 330                 kfree(sess);
 331                 return -ENOMEM;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int iscsi_login_zero_tsih_s2(
 338         struct iscsi_conn *conn)
 339 {
 340         struct iscsi_node_attrib *na;
 341         struct iscsi_session *sess = conn->sess;
 342         unsigned char buf[32];
 343         bool iser = false;
 344
 345         sess->tpg = conn->tpg;
 346
 347         /*
 348          * Assign a new TPG Session Handle.  Note this is protected with
 349          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 350          */
 351         sess->tsih = ++sess->tpg->ntsih;
 352         if (!sess->tsih)
 353                 sess->tsih = ++sess->tpg->ntsih;
 354
 355         /*
 356          * Create the default params from user defined values..
 357          */
 358         if (iscsi_copy_param_list(&conn->param_list,
 359                                 conn->tpg->param_list, 1) < 0) {
 360                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 361                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 362                 return -1;
 363         }
 364
 365         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 366                 iser = true;
 367
 368         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 369
 370         if (sess->sess_ops->SessionType)
 371                 return iscsi_set_keys_irrelevant_for_discovery(
 372                                 conn->param_list);
 373
 374         na = iscsit_tpg_get_node_attrib(sess);
 375
 376         /*
 377          * Need to send TargetPortalGroupTag back in first login response
 378          * on any iSCSI connection where the Initiator provides TargetName.
 379          * See 5.3.1.  Login Phase Start
 380          *
 381          * In our case, we have already located the struct iscsi_tiqn at this point.
 382          */
 383         memset(buf, 0, 32);
 384         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 385         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 386                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 387                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 388                 return -1;
 389         }
 390
 391         /*
 392          * Workaround for Initiators that have broken connection recovery logic.
 393          *
 394          * "We would really like to get rid of this." Linux-iSCSI.org team
 395          */
 396         memset(buf, 0, 32);
 397         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 398         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 399                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 400                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 401                 return -1;
 402         }
 403
 404         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 405                 return -1;
 406         /*
 407          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 408          */
 409         if (iser) {
 410                 struct iscsi_param *param;
 411                 unsigned long mrdsl, off;
 412                 int rc;
 413
 414                 sprintf(buf, "RDMAExtensions=Yes");
 415                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 416                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 417                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 418                         return -1;
 419                 }
 420                 /*
 421                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 422                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 423                  */
 424                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 425                                                   conn->param_list);
 426                 if (!param) {
 427                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 428                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 429                         return -1;
 430                 }
 431                 rc = kstrtoul(param->value, 0, &mrdsl);
 432                 if (rc < 0) {
 433                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 434                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 435                         return -1;
 436                 }
 437                 off = mrdsl % PAGE_SIZE;
 438                 if (!off)
 439                         return 0;
 440
 441                 if (mrdsl < PAGE_SIZE)
 442                         mrdsl = PAGE_SIZE;
 443                 else
 444                         mrdsl -= off;
 445
 446                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 447                         " to PAGE_SIZE\n", mrdsl);
 448
 449                 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
 450                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 451                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 452                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 453                         return -1;
 454                 }
 455         }
 456
 457         return 0;
 458 }
 459
 460 /*
 461  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 462  * The Initiator node will be able to enable FIM by proposing them itself.
 463  */
 464 int iscsi_login_disable_FIM_keys(
 465         struct iscsi_param_list *param_list,
 466         struct iscsi_conn *conn)
 467 {
 468         struct iscsi_param *param;
 469
 470         param = iscsi_find_param_from_key("OFMarker", param_list);
 471         if (!param) {
 472                 pr_err("iscsi_find_param_from_key() for"
 473                                 " OFMarker failed\n");
 474                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 475                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 476                 return -1;
 477         }
 478         param->state &= ~PSTATE_NEGOTIATE;
 479
 480         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 481         if (!param) {
 482                 pr_err("iscsi_find_param_from_key() for"
 483                                 " IFMarker failed\n");
 484                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 485                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 486                 return -1;
 487         }
 488         param->state &= ~PSTATE_NEGOTIATE;
 489
 490         param = iscsi_find_param_from_key("IFMarker", param_list);
 491         if (!param) {
 492                 pr_err("iscsi_find_param_from_key() for"
 493                                 " IFMarker failed\n");
 494                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 495                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 496                 return -1;
 497         }
 498         param->state &= ~PSTATE_NEGOTIATE;
 499
 500         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 501         if (!param) {
 502                 pr_err("iscsi_find_param_from_key() for"
 503                                 " IFMarker failed\n");
 504                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 505                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 506                 return -1;
 507         }
 508         param->state &= ~PSTATE_NEGOTIATE;
 509
 510         return 0;
 511 }
 512
 513 static int iscsi_login_non_zero_tsih_s1(
 514         struct iscsi_conn *conn,
 515         unsigned char *buf)
 516 {
 517         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 518
 519         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 520         return 0;
 521 }
 522
 523 /*
 524  *      Add a new connection to an existing session.
 525  */
 526 static int iscsi_login_non_zero_tsih_s2(
 527         struct iscsi_conn *conn,
 528         unsigned char *buf)
 529 {
 530         struct iscsi_portal_group *tpg = conn->tpg;
 531         struct iscsi_session *sess = NULL, *sess_p = NULL;
 532         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 533         struct se_session *se_sess, *se_sess_tmp;
 534         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 535         bool iser = false;
 536
 537         spin_lock_bh(&se_tpg->session_lock);
 538         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 539                         sess_list) {
 540
 541                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 542                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 543                     atomic_read(&sess_p->session_logout) ||
 544                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 545                         continue;
 546                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 547                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 548                         iscsit_inc_session_usage_count(sess_p);
 549                         iscsit_stop_time2retain_timer(sess_p);
 550                         sess = sess_p;
 551                         break;
 552                 }
 553         }
 554         spin_unlock_bh(&se_tpg->session_lock);
 555
 556         /*
 557          * If the Time2Retain handler has expired, the session is already gone.
 558          */
 559         if (!sess) {
 560                 pr_err("Initiator attempting to add a connection to"
 561                         " a non-existent session, rejecting iSCSI Login.\n");
 562                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 563                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 564                 return -1;
 565         }
 566
 567         /*
 568          * Stop the Time2Retain timer if this is a failed session, we restart
 569          * the timer if the login is not successful.
 570          */
 571         spin_lock_bh(&sess->conn_lock);
 572         if (sess->session_state == TARG_SESS_STATE_FAILED)
 573                 atomic_set(&sess->session_continuation, 1);
 574         spin_unlock_bh(&sess->conn_lock);
 575
 576         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 577
 578         if (iscsi_copy_param_list(&conn->param_list,
 579                         conn->tpg->param_list, 0) < 0) {
 580                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 581                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 582                 return -1;
 583         }
 584
 585         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 586                 iser = true;
 587
 588         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 589         /*
 590          * Need to send TargetPortalGroupTag back in first login response
 591          * on any iSCSI connection where the Initiator provides TargetName.
 592          * See 5.3.1.  Login Phase Start
 593          *
 594          * In our case, we have already located the struct iscsi_tiqn at this point.
 595          */
 596         memset(buf, 0, 32);
 597         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 598         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 599                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 600                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 601                 return -1;
 602         }
 603
 604         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 605 }
 606
 607 int iscsi_login_post_auth_non_zero_tsih(
 608         struct iscsi_conn *conn,
 609         u16 cid,
 610         u32 exp_statsn)
 611 {
 612         struct iscsi_conn *conn_ptr = NULL;
 613         struct iscsi_conn_recovery *cr = NULL;
 614         struct iscsi_session *sess = conn->sess;
 615
 616         /*
 617          * By following item 5 in the login table,  if we have found
 618          * an existing ISID and a valid/existing TSIH and an existing
 619          * CID we do connection reinstatement.  Currently we dont not
 620          * support it so we send back an non-zero status class to the
 621          * initiator and release the new connection.
 622          */
 623         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 624         if (conn_ptr) {
 625                 pr_err("Connection exists with CID %hu for %s,"
 626                         " performing connection reinstatement.\n",
 627                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 628
 629                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 630                 iscsit_dec_conn_usage_count(conn_ptr);
 631         }
 632
 633         /*
 634          * Check for any connection recovery entires containing CID.
 635          * We use the original ExpStatSN sent in the first login request
 636          * to acknowledge commands for the failed connection.
 637          *
 638          * Also note that an explict logout may have already been sent,
 639          * but the response may not be sent due to additional connection
 640          * loss.
 641          */
 642         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 643                 cr = iscsit_get_inactive_connection_recovery_entry(
 644                                 sess, cid);
 645                 if (cr) {
 646                         pr_debug("Performing implicit logout"
 647                                 " for connection recovery on CID: %hu\n",
 648                                         conn->cid);
 649                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 650                 }
 651         }
 652
 653         /*
 654          * Else we follow item 4 from the login table in that we have
 655          * found an existing ISID and a valid/existing TSIH and a new
 656          * CID we go ahead and continue to add a new connection to the
 657          * session.
 658          */
 659         pr_debug("Adding CID %hu to existing session for %s.\n",
 660                         cid, sess->sess_ops->InitiatorName);
 661
 662         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 663                 pr_err("Adding additional connection to this session"
 664                         " would exceed MaxConnections %d, login failed.\n",
 665                                 sess->sess_ops->MaxConnections);
 666                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 667                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 668                 return -1;
 669         }
 670
 671         return 0;
 672 }
 673
 674 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 675 {
 676         struct iscsi_session *sess = conn->sess;
 677         /*
 678          * FIXME: Unsolicitied NopIN support for ISER
 679          */
 680         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 681                 return;
 682
 683         if (!sess->sess_ops->SessionType)
 684                 iscsit_start_nopin_timer(conn);
 685 }
 686
 687 int iscsi_post_login_handler(
 688         struct iscsi_np *np,
 689         struct iscsi_conn *conn,
 690         u8 zero_tsih)
 691 {
 692         int stop_timer = 0;
 693         struct iscsi_session *sess = conn->sess;
 694         struct se_session *se_sess = sess->se_sess;
 695         struct iscsi_portal_group *tpg = sess->tpg;
 696         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 697         struct iscsi_thread_set *ts;
 698
 699         iscsit_inc_conn_usage_count(conn);
 700
 701         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 702                         ISCSI_LOGIN_STATUS_ACCEPT);
 703
 704         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 705         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 706
 707         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 708         iscsit_set_sync_and_steering_values(conn);
 709         /*
 710          * SCSI Initiator -> SCSI Target Port Mapping
 711          */
 712         ts = iscsi_get_thread_set();
 713         if (!zero_tsih) {
 714                 iscsi_set_session_parameters(sess->sess_ops,
 715                                 conn->param_list, 0);
 716                 iscsi_release_param_list(conn->param_list);
 717                 conn->param_list = NULL;
 718
 719                 spin_lock_bh(&sess->conn_lock);
 720                 atomic_set(&sess->session_continuation, 0);
 721                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 722                         pr_debug("Moving to"
 723                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 724                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 725                         stop_timer = 1;
 726                 }
 727
 728                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 729                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 730                         conn->local_ip, conn->local_port, tpg->tpgt);
 731
 732                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 733                 atomic_inc(&sess->nconn);
 734                 pr_debug("Incremented iSCSI Connection count to %hu"
 735                         " from node: %s\n", atomic_read(&sess->nconn),
 736                         sess->sess_ops->InitiatorName);
 737                 spin_unlock_bh(&sess->conn_lock);
 738
 739                 iscsi_post_login_start_timers(conn);
 740
 741                 iscsi_activate_thread_set(conn, ts);
 742                 /*
 743                  * Determine CPU mask to ensure connection's RX and TX kthreads
 744                  * are scheduled on the same CPU.
 745                  */
 746                 iscsit_thread_get_cpumask(conn);
 747                 conn->conn_rx_reset_cpumask = 1;
 748                 conn->conn_tx_reset_cpumask = 1;
 749
 750                 iscsit_dec_conn_usage_count(conn);
 751                 if (stop_timer) {
 752                         spin_lock_bh(&se_tpg->session_lock);
 753                         iscsit_stop_time2retain_timer(sess);
 754                         spin_unlock_bh(&se_tpg->session_lock);
 755                 }
 756                 iscsit_dec_session_usage_count(sess);
 757                 return 0;
 758         }
 759
 760         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 761         iscsi_release_param_list(conn->param_list);
 762         conn->param_list = NULL;
 763
 764         iscsit_determine_maxcmdsn(sess);
 765
 766         spin_lock_bh(&se_tpg->session_lock);
 767         __transport_register_session(&sess->tpg->tpg_se_tpg,
 768                         se_sess->se_node_acl, se_sess, sess);
 769         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 770         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 771
 772         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 773                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 774                 tpg->tpgt);
 775
 776         spin_lock_bh(&sess->conn_lock);
 777         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 778         atomic_inc(&sess->nconn);
 779         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 780                 " %s\n", atomic_read(&sess->nconn),
 781                 sess->sess_ops->InitiatorName);
 782         spin_unlock_bh(&sess->conn_lock);
 783
 784         sess->sid = tpg->sid++;
 785         if (!sess->sid)
 786                 sess->sid = tpg->sid++;
 787         pr_debug("Established iSCSI session from node: %s\n",
 788                         sess->sess_ops->InitiatorName);
 789
 790         tpg->nsessions++;
 791         if (tpg->tpg_tiqn)
 792                 tpg->tpg_tiqn->tiqn_nsessions++;
 793
 794         pr_debug("Incremented number of active iSCSI sessions to %u on"
 795                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 796         spin_unlock_bh(&se_tpg->session_lock);
 797
 798         iscsi_post_login_start_timers(conn);
 799         iscsi_activate_thread_set(conn, ts);
 800         /*
 801          * Determine CPU mask to ensure connection's RX and TX kthreads
 802          * are scheduled on the same CPU.
 803          */
 804         iscsit_thread_get_cpumask(conn);
 805         conn->conn_rx_reset_cpumask = 1;
 806         conn->conn_tx_reset_cpumask = 1;
 807
 808         iscsit_dec_conn_usage_count(conn);
 809
 810         return 0;
 811 }
 812
 813 static void iscsi_handle_login_thread_timeout(unsigned long data)
 814 {
 815         struct iscsi_np *np = (struct iscsi_np *) data;
 816
 817         spin_lock_bh(&np->np_thread_lock);
 818         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 819                         np->np_ip, np->np_port);
 820
 821         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 822                 spin_unlock_bh(&np->np_thread_lock);
 823                 return;
 824         }
 825
 826         if (np->np_thread)
 827                 send_sig(SIGINT, np->np_thread, 1);
 828
 829         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 830         spin_unlock_bh(&np->np_thread_lock);
 831 }
 832
 833 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 834 {
 835         /*
 836          * This used the TA_LOGIN_TIMEOUT constant because at this
 837          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 838          */
 839         spin_lock_bh(&np->np_thread_lock);
 840         init_timer(&np->np_login_timer);
 841         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 842         np->np_login_timer.data = (unsigned long)np;
 843         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 844         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 845         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 846         add_timer(&np->np_login_timer);
 847
 848         pr_debug("Added timeout timer to iSCSI login request for"
 849                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 850         spin_unlock_bh(&np->np_thread_lock);
 851 }
 852
 853 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 854 {
 855         spin_lock_bh(&np->np_thread_lock);
 856         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 857                 spin_unlock_bh(&np->np_thread_lock);
 858                 return;
 859         }
 860         np->np_login_timer_flags |= ISCSI_TF_STOP;
 861         spin_unlock_bh(&np->np_thread_lock);
 862
 863         del_timer_sync(&np->np_login_timer);
 864
 865         spin_lock_bh(&np->np_thread_lock);
 866         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 867         spin_unlock_bh(&np->np_thread_lock);
 868 }
 869
 870 int iscsit_setup_np(
 871         struct iscsi_np *np,
 872         struct __kernel_sockaddr_storage *sockaddr)
 873 {
 874         struct socket *sock = NULL;
 875         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 876
 877         switch (np->np_network_transport) {
 878         case ISCSI_TCP:
 879                 np->np_ip_proto = IPPROTO_TCP;
 880                 np->np_sock_type = SOCK_STREAM;
 881                 break;
 882         case ISCSI_SCTP_TCP:
 883                 np->np_ip_proto = IPPROTO_SCTP;
 884                 np->np_sock_type = SOCK_STREAM;
 885                 break;
 886         case ISCSI_SCTP_UDP:
 887                 np->np_ip_proto = IPPROTO_SCTP;
 888                 np->np_sock_type = SOCK_SEQPACKET;
 889                 break;
 890         default:
 891                 pr_err("Unsupported network_transport: %d\n",
 892                                 np->np_network_transport);
 893                 return -EINVAL;
 894         }
 895
 896         np->np_ip_proto = IPPROTO_TCP;
 897         np->np_sock_type = SOCK_STREAM;
 898
 899         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 900                         np->np_ip_proto, &sock);
 901         if (ret < 0) {
 902                 pr_err("sock_create() failed.\n");
 903                 return ret;
 904         }
 905         np->np_socket = sock;
 906         /*
 907          * Setup the np->np_sockaddr from the passed sockaddr setup
 908          * in iscsi_target_configfs.c code..
 909          */
 910         memcpy(&np->np_sockaddr, sockaddr,
 911                         sizeof(struct __kernel_sockaddr_storage));
 912
 913         if (sockaddr->ss_family == AF_INET6)
 914                 len = sizeof(struct sockaddr_in6);
 915         else
 916                 len = sizeof(struct sockaddr_in);
 917         /*
 918          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 919          */
 920         /* FIXME: Someone please explain why this is endian-safe */
 921         opt = 1;
 922         if (np->np_network_transport == ISCSI_TCP) {
 923                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 924                                 (char *)&opt, sizeof(opt));
 925                 if (ret < 0) {
 926                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 927                                 " failed: %d\n", ret);
 928                         goto fail;
 929                 }
 930         }
 931
 932         /* FIXME: Someone please explain why this is endian-safe */
 933         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 934                         (char *)&opt, sizeof(opt));
 935         if (ret < 0) {
 936                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 937                         " failed\n");
 938                 goto fail;
 939         }
 940
 941         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 942                         (char *)&opt, sizeof(opt));
 943         if (ret < 0) {
 944                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 945                         " failed\n");
 946                 goto fail;
 947         }
 948
 949         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 950         if (ret < 0) {
 951                 pr_err("kernel_bind() failed: %d\n", ret);
 952                 goto fail;
 953         }
 954
 955         ret = kernel_listen(sock, backlog);
 956         if (ret != 0) {
 957                 pr_err("kernel_listen() failed: %d\n", ret);
 958                 goto fail;
 959         }
 960
 961         return 0;
 962 fail:
 963         np->np_socket = NULL;
 964         if (sock)
 965                 sock_release(sock);
 966         return ret;
 967 }
 968
 969 int iscsi_target_setup_login_socket(
 970         struct iscsi_np *np,
 971         struct __kernel_sockaddr_storage *sockaddr)
 972 {
 973         struct iscsit_transport *t;
 974         int rc;
 975
 976         t = iscsit_get_transport(np->np_network_transport);
 977         if (!t)
 978                 return -EINVAL;
 979
 980         rc = t->iscsit_setup_np(np, sockaddr);
 981         if (rc < 0) {
 982                 iscsit_put_transport(t);
 983                 return rc;
 984         }
 985
 986         np->np_transport = t;
 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                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1011                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1012                                         &sock_in6.sin6_addr.in6_u);
1013                         else
1014                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1015                                         &sock_in6.sin6_addr.s6_addr32[3]);
1016                         conn->login_port = ntohs(sock_in6.sin6_port);
1017                 }
1018
1019                 rc = conn->sock->ops->getname(conn->sock,
1020                                 (struct sockaddr *)&sock_in6, &err, 0);
1021                 if (!rc) {
1022                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1023                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1024                                         &sock_in6.sin6_addr.in6_u);
1025                         else
1026                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1027                                         &sock_in6.sin6_addr.s6_addr32[3]);
1028                         conn->local_port = ntohs(sock_in6.sin6_port);
1029                 }
1030         } else {
1031                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1032
1033                 rc = conn->sock->ops->getname(conn->sock,
1034                                 (struct sockaddr *)&sock_in, &err, 1);
1035                 if (!rc) {
1036                         sprintf(conn->login_ip, "%pI4",
1037                                         &sock_in.sin_addr.s_addr);
1038                         conn->login_port = ntohs(sock_in.sin_port);
1039                 }
1040
1041                 rc = conn->sock->ops->getname(conn->sock,
1042                                 (struct sockaddr *)&sock_in, &err, 0);
1043                 if (!rc) {
1044                         sprintf(conn->local_ip, "%pI4",
1045                                         &sock_in.sin_addr.s_addr);
1046                         conn->local_port = ntohs(sock_in.sin_port);
1047                 }
1048         }
1049
1050         return 0;
1051 }
1052
1053 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1054 {
1055         struct iscsi_login_req *login_req;
1056         u32 padding = 0, payload_length;
1057
1058         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1059                 return -1;
1060
1061         login_req = (struct iscsi_login_req *)login->req;
1062         payload_length  = ntoh24(login_req->dlength);
1063         padding = ((-payload_length) & 3);
1064
1065         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1066                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1067                 login_req->flags, login_req->itt, login_req->cmdsn,
1068                 login_req->exp_statsn, login_req->cid, payload_length);
1069         /*
1070          * Setup the initial iscsi_login values from the leading
1071          * login request PDU.
1072          */
1073         if (login->first_request) {
1074                 login_req = (struct iscsi_login_req *)login->req;
1075                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1076                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1077                 login->version_min      = login_req->min_version;
1078                 login->version_max      = login_req->max_version;
1079                 memcpy(login->isid, login_req->isid, 6);
1080                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1081                 login->init_task_tag    = login_req->itt;
1082                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1083                 login->cid              = be16_to_cpu(login_req->cid);
1084                 login->tsih             = be16_to_cpu(login_req->tsih);
1085         }
1086
1087         if (iscsi_target_check_login_request(conn, login) < 0)
1088                 return -1;
1089
1090         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1091         if (iscsi_login_rx_data(conn, login->req_buf,
1092                                 payload_length + padding) < 0)
1093                 return -1;
1094
1095         return 0;
1096 }
1097
1098 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1099                         u32 length)
1100 {
1101         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1102                 return -1;
1103
1104         return 0;
1105 }
1106
1107 static int
1108 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1109 {
1110         int rc;
1111
1112         if (!t->owner) {
1113                 conn->conn_transport = t;
1114                 return 0;
1115         }
1116
1117         rc = try_module_get(t->owner);
1118         if (!rc) {
1119                 pr_err("try_module_get() failed for %s\n", t->name);
1120                 return -EINVAL;
1121         }
1122
1123         conn->conn_transport = t;
1124         return 0;
1125 }
1126
1127 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1128                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1129 {
1130         if (new_sess == false)
1131                 goto old_sess_out;
1132
1133         pr_err("iSCSI Login negotiation failed.\n");
1134         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1135                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1136         if (!zero_tsih || !conn->sess)
1137                 goto old_sess_out;
1138         if (conn->sess->se_sess)
1139                 transport_free_session(conn->sess->se_sess);
1140         if (conn->sess->session_index != 0) {
1141                 spin_lock_bh(&sess_idr_lock);
1142                 idr_remove(&sess_idr, conn->sess->session_index);
1143                 spin_unlock_bh(&sess_idr_lock);
1144         }
1145         kfree(conn->sess->sess_ops);
1146         kfree(conn->sess);
1147
1148 old_sess_out:
1149         iscsi_stop_login_thread_timer(np);
1150         /*
1151          * If login negotiation fails check if the Time2Retain timer
1152          * needs to be restarted.
1153          */
1154         if (!zero_tsih && conn->sess) {
1155                 spin_lock_bh(&conn->sess->conn_lock);
1156                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1157                         struct se_portal_group *se_tpg =
1158                                         &conn->tpg->tpg_se_tpg;
1159
1160                         atomic_set(&conn->sess->session_continuation, 0);
1161                         spin_unlock_bh(&conn->sess->conn_lock);
1162                         spin_lock_bh(&se_tpg->session_lock);
1163                         iscsit_start_time2retain_handler(conn->sess);
1164                         spin_unlock_bh(&se_tpg->session_lock);
1165                 } else
1166                         spin_unlock_bh(&conn->sess->conn_lock);
1167                 iscsit_dec_session_usage_count(conn->sess);
1168         }
1169
1170         if (!IS_ERR(conn->conn_rx_hash.tfm))
1171                 crypto_free_hash(conn->conn_rx_hash.tfm);
1172         if (!IS_ERR(conn->conn_tx_hash.tfm))
1173                 crypto_free_hash(conn->conn_tx_hash.tfm);
1174
1175         if (conn->conn_cpumask)
1176                 free_cpumask_var(conn->conn_cpumask);
1177
1178         kfree(conn->conn_ops);
1179
1180         if (conn->param_list) {
1181                 iscsi_release_param_list(conn->param_list);
1182                 conn->param_list = NULL;
1183         }
1184         iscsi_target_nego_release(conn);
1185
1186         if (conn->sock) {
1187                 sock_release(conn->sock);
1188                 conn->sock = NULL;
1189         }
1190
1191         if (conn->conn_transport->iscsit_free_conn)
1192                 conn->conn_transport->iscsit_free_conn(conn);
1193
1194         iscsit_put_transport(conn->conn_transport);
1195         kfree(conn);
1196 }
1197
1198 static int __iscsi_target_login_thread(struct iscsi_np *np)
1199 {
1200         u8 *buffer, zero_tsih = 0;
1201         int ret = 0, rc, stop;
1202         struct iscsi_conn *conn = NULL;
1203         struct iscsi_login *login;
1204         struct iscsi_portal_group *tpg = NULL;
1205         struct iscsi_login_req *pdu;
1206         struct iscsi_tpg_np *tpg_np;
1207         bool new_sess = false;
1208
1209         flush_signals(current);
1210
1211         spin_lock_bh(&np->np_thread_lock);
1212         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1213                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1214                 complete(&np->np_restart_comp);
1215         } else {
1216                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1217         }
1218         spin_unlock_bh(&np->np_thread_lock);
1219
1220         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1221         if (!conn) {
1222                 pr_err("Could not allocate memory for"
1223                         " new connection\n");
1224                 /* Get another socket */
1225                 return 1;
1226         }
1227         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1228         conn->conn_state = TARG_CONN_STATE_FREE;
1229
1230         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1231                 kfree(conn);
1232                 return 1;
1233         }
1234
1235         rc = np->np_transport->iscsit_accept_np(np, conn);
1236         if (rc == -ENOSYS) {
1237                 complete(&np->np_restart_comp);
1238                 iscsit_put_transport(conn->conn_transport);
1239                 kfree(conn);
1240                 conn = NULL;
1241                 goto exit;
1242         } else if (rc < 0) {
1243                 spin_lock_bh(&np->np_thread_lock);
1244                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1245                         spin_unlock_bh(&np->np_thread_lock);
1246                         complete(&np->np_restart_comp);
1247                         iscsit_put_transport(conn->conn_transport);
1248                         kfree(conn);
1249                         conn = NULL;
1250                         if (ret == -ENODEV)
1251                                 goto out;
1252                         /* Get another socket */
1253                         return 1;
1254                 }
1255                 spin_unlock_bh(&np->np_thread_lock);
1256                 iscsit_put_transport(conn->conn_transport);
1257                 kfree(conn);
1258                 conn = NULL;
1259                 goto out;
1260         }
1261         /*
1262          * Perform the remaining iSCSI connection initialization items..
1263          */
1264         login = iscsi_login_init_conn(conn);
1265         if (!login) {
1266                 goto new_sess_out;
1267         }
1268
1269         iscsi_start_login_thread_timer(np);
1270
1271         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1272         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1273         /*
1274          * This will process the first login request + payload..
1275          */
1276         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1277         if (rc == 1)
1278                 return 1;
1279         else if (rc < 0)
1280                 goto new_sess_out;
1281
1282         buffer = &login->req[0];
1283         pdu = (struct iscsi_login_req *)buffer;
1284         /*
1285          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1286          * when Status-Class != 0.
1287         */
1288         conn->login_itt = pdu->itt;
1289
1290         spin_lock_bh(&np->np_thread_lock);
1291         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1292                 spin_unlock_bh(&np->np_thread_lock);
1293                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1294                         " active.\n", np->np_ip, np->np_port);
1295                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1296                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1297                 goto new_sess_out;
1298         }
1299         spin_unlock_bh(&np->np_thread_lock);
1300
1301         conn->network_transport = np->np_network_transport;
1302
1303         pr_debug("Received iSCSI login request from %s on %s Network"
1304                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1305                 conn->local_ip, conn->local_port);
1306
1307         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1308         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1309
1310         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1311                         pdu->min_version) < 0)
1312                 goto new_sess_out;
1313
1314         zero_tsih = (pdu->tsih == 0x0000);
1315         if (zero_tsih) {
1316                 /*
1317                  * This is the leading connection of a new session.
1318                  * We wait until after authentication to check for
1319                  * session reinstatement.
1320                  */
1321                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1322                         goto new_sess_out;
1323         } else {
1324                 /*
1325                  * Add a new connection to an existing session.
1326                  * We check for a non-existant session in
1327                  * iscsi_login_non_zero_tsih_s2() below based
1328                  * on ISID/TSIH, but wait until after authentication
1329                  * to check for connection reinstatement, etc.
1330                  */
1331                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1332                         goto new_sess_out;
1333         }
1334         /*
1335          * SessionType: Discovery
1336          *
1337          *      Locates Default Portal
1338          *
1339          * SessionType: Normal
1340          *
1341          *      Locates Target Portal from NP -> Target IQN
1342          */
1343         rc = iscsi_target_locate_portal(np, conn, login);
1344         if (rc < 0) {
1345                 tpg = conn->tpg;
1346                 goto new_sess_out;
1347         }
1348         login->zero_tsih = zero_tsih;
1349
1350         tpg = conn->tpg;
1351         if (!tpg) {
1352                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1353                 goto new_sess_out;
1354         }
1355
1356         if (zero_tsih) {
1357                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1358                         goto new_sess_out;
1359         } else {
1360                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1361                         goto old_sess_out;
1362         }
1363
1364         ret = iscsi_target_start_negotiation(login, conn);
1365         if (ret < 0)
1366                 goto new_sess_out;
1367
1368         if (!conn->sess) {
1369                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1370                 goto new_sess_out;
1371         }
1372
1373         iscsi_stop_login_thread_timer(np);
1374
1375         if (signal_pending(current))
1376                 goto new_sess_out;
1377
1378         if (ret == 1) {
1379                 tpg_np = conn->tpg_np;
1380
1381                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1382                 if (ret < 0)
1383                         goto new_sess_out;
1384
1385                 iscsit_deaccess_np(np, tpg, tpg_np);
1386         }
1387
1388         tpg = NULL;
1389         tpg_np = NULL;
1390         /* Get another socket */
1391         return 1;
1392
1393 new_sess_out:
1394         new_sess = true;
1395 old_sess_out:
1396         tpg_np = conn->tpg_np;
1397         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1398         new_sess = false;
1399
1400         if (tpg) {
1401                 iscsit_deaccess_np(np, tpg, tpg_np);
1402                 tpg = NULL;
1403                 tpg_np = NULL;
1404         }
1405
1406 out:
1407         stop = kthread_should_stop();
1408         /* Wait for another socket.. */
1409         if (!stop)
1410                 return 1;
1411 exit:
1412         iscsi_stop_login_thread_timer(np);
1413         spin_lock_bh(&np->np_thread_lock);
1414         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1415         spin_unlock_bh(&np->np_thread_lock);
1416
1417         return 0;
1418 }
1419
1420 int iscsi_target_login_thread(void *arg)
1421 {
1422         struct iscsi_np *np = arg;
1423         int ret;
1424
1425         allow_signal(SIGINT);
1426
1427         while (!kthread_should_stop()) {
1428                 ret = __iscsi_target_login_thread(np);
1429                 /*
1430                  * We break and exit here unless another sock_accept() call
1431                  * is expected.
1432                  */
1433                 if (ret != 1)
1434                         break;
1435         }
1436
1437         return 0;
1438 }