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 static __printf(2, 3) int iscsi_change_param_sprintf(
 253         struct iscsi_conn *conn,
 254         const char *fmt, ...)
 255 {
 256         va_list args;
 257         unsigned char buf[64];
 258
 259         memset(buf, 0, sizeof buf);
 260
 261         va_start(args, fmt);
 262         vsnprintf(buf, sizeof buf, fmt, args);
 263         va_end(args);
 264
 265         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 266                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 267                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 268                 return -1;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  *      This is the leading connection of a new session,
 276  *      or session reinstatement.
 277  */
 278 static int iscsi_login_zero_tsih_s1(
 279         struct iscsi_conn *conn,
 280         unsigned char *buf)
 281 {
 282         struct iscsi_session *sess = NULL;
 283         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 284         int ret;
 285
 286         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 287         if (!sess) {
 288                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 289                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 290                 pr_err("Could not allocate memory for session\n");
 291                 return -ENOMEM;
 292         }
 293
 294         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 295         sess->init_task_tag     = pdu->itt;
 296         memcpy(&sess->isid, pdu->isid, 6);
 297         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 298         INIT_LIST_HEAD(&sess->sess_conn_list);
 299         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 300         INIT_LIST_HEAD(&sess->cr_active_list);
 301         INIT_LIST_HEAD(&sess->cr_inactive_list);
 302         init_completion(&sess->async_msg_comp);
 303         init_completion(&sess->reinstatement_comp);
 304         init_completion(&sess->session_wait_comp);
 305         init_completion(&sess->session_waiting_on_uc_comp);
 306         mutex_init(&sess->cmdsn_mutex);
 307         spin_lock_init(&sess->conn_lock);
 308         spin_lock_init(&sess->cr_a_lock);
 309         spin_lock_init(&sess->cr_i_lock);
 310         spin_lock_init(&sess->session_usage_lock);
 311         spin_lock_init(&sess->ttt_lock);
 312
 313         idr_preload(GFP_KERNEL);
 314         spin_lock_bh(&sess_idr_lock);
 315         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 316         if (ret >= 0)
 317                 sess->session_index = ret;
 318         spin_unlock_bh(&sess_idr_lock);
 319         idr_preload_end();
 320
 321         if (ret < 0) {
 322                 pr_err("idr_alloc() for sess_idr failed\n");
 323                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 324                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 325                 kfree(sess);
 326                 return -ENOMEM;
 327         }
 328
 329         sess->creation_time = get_jiffies_64();
 330         /*
 331          * The FFP CmdSN window values will be allocated from the TPG's
 332          * Initiator Node's ACL once the login has been successfully completed.
 333          */
 334         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 335
 336         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 337         if (!sess->sess_ops) {
 338                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 339                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 340                 pr_err("Unable to allocate memory for"
 341                                 " struct iscsi_sess_ops.\n");
 342                 kfree(sess);
 343                 return -ENOMEM;
 344         }
 345
 346         sess->se_sess = transport_init_session();
 347         if (IS_ERR(sess->se_sess)) {
 348                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 349                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 350                 kfree(sess);
 351                 return -ENOMEM;
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int iscsi_login_zero_tsih_s2(
 358         struct iscsi_conn *conn)
 359 {
 360         struct iscsi_node_attrib *na;
 361         struct iscsi_session *sess = conn->sess;
 362         bool iser = false;
 363
 364         sess->tpg = conn->tpg;
 365
 366         /*
 367          * Assign a new TPG Session Handle.  Note this is protected with
 368          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 369          */
 370         sess->tsih = ++sess->tpg->ntsih;
 371         if (!sess->tsih)
 372                 sess->tsih = ++sess->tpg->ntsih;
 373
 374         /*
 375          * Create the default params from user defined values..
 376          */
 377         if (iscsi_copy_param_list(&conn->param_list,
 378                                 conn->tpg->param_list, 1) < 0) {
 379                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 380                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 381                 return -1;
 382         }
 383
 384         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 385                 iser = true;
 386
 387         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 388
 389         if (sess->sess_ops->SessionType)
 390                 return iscsi_set_keys_irrelevant_for_discovery(
 391                                 conn->param_list);
 392
 393         na = iscsit_tpg_get_node_attrib(sess);
 394
 395         /*
 396          * Need to send TargetPortalGroupTag back in first login response
 397          * on any iSCSI connection where the Initiator provides TargetName.
 398          * See 5.3.1.  Login Phase Start
 399          *
 400          * In our case, we have already located the struct iscsi_tiqn at this point.
 401          */
 402         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 403                 return -1;
 404
 405         /*
 406          * Workaround for Initiators that have broken connection recovery logic.
 407          *
 408          * "We would really like to get rid of this." Linux-iSCSI.org team
 409          */
 410         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 411                 return -1;
 412
 413         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 414                 return -1;
 415         /*
 416          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 417          */
 418         if (iser) {
 419                 struct iscsi_param *param;
 420                 unsigned long mrdsl, off;
 421                 int rc;
 422
 423                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 424                         return -1;
 425
 426                 /*
 427                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 428                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 429                  */
 430                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 431                                                   conn->param_list);
 432                 if (!param) {
 433                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 434                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 435                         return -1;
 436                 }
 437                 rc = kstrtoul(param->value, 0, &mrdsl);
 438                 if (rc < 0) {
 439                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 440                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 441                         return -1;
 442                 }
 443                 off = mrdsl % PAGE_SIZE;
 444                 if (!off)
 445                         return 0;
 446
 447                 if (mrdsl < PAGE_SIZE)
 448                         mrdsl = PAGE_SIZE;
 449                 else
 450                         mrdsl -= off;
 451
 452                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 453                         " to PAGE_SIZE\n", mrdsl);
 454
 455                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 456                         return -1;
 457         }
 458
 459         return 0;
 460 }
 461
 462 /*
 463  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 464  * The Initiator node will be able to enable FIM by proposing them itself.
 465  */
 466 int iscsi_login_disable_FIM_keys(
 467         struct iscsi_param_list *param_list,
 468         struct iscsi_conn *conn)
 469 {
 470         struct iscsi_param *param;
 471
 472         param = iscsi_find_param_from_key("OFMarker", param_list);
 473         if (!param) {
 474                 pr_err("iscsi_find_param_from_key() for"
 475                                 " OFMarker failed\n");
 476                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 477                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 478                 return -1;
 479         }
 480         param->state &= ~PSTATE_NEGOTIATE;
 481
 482         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 483         if (!param) {
 484                 pr_err("iscsi_find_param_from_key() for"
 485                                 " IFMarker failed\n");
 486                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 487                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 488                 return -1;
 489         }
 490         param->state &= ~PSTATE_NEGOTIATE;
 491
 492         param = iscsi_find_param_from_key("IFMarker", param_list);
 493         if (!param) {
 494                 pr_err("iscsi_find_param_from_key() for"
 495                                 " IFMarker failed\n");
 496                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 497                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 498                 return -1;
 499         }
 500         param->state &= ~PSTATE_NEGOTIATE;
 501
 502         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 503         if (!param) {
 504                 pr_err("iscsi_find_param_from_key() for"
 505                                 " IFMarker failed\n");
 506                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 507                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 508                 return -1;
 509         }
 510         param->state &= ~PSTATE_NEGOTIATE;
 511
 512         return 0;
 513 }
 514
 515 static int iscsi_login_non_zero_tsih_s1(
 516         struct iscsi_conn *conn,
 517         unsigned char *buf)
 518 {
 519         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 520
 521         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 522         return 0;
 523 }
 524
 525 /*
 526  *      Add a new connection to an existing session.
 527  */
 528 static int iscsi_login_non_zero_tsih_s2(
 529         struct iscsi_conn *conn,
 530         unsigned char *buf)
 531 {
 532         struct iscsi_portal_group *tpg = conn->tpg;
 533         struct iscsi_session *sess = NULL, *sess_p = NULL;
 534         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 535         struct se_session *se_sess, *se_sess_tmp;
 536         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 537         bool iser = false;
 538
 539         spin_lock_bh(&se_tpg->session_lock);
 540         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 541                         sess_list) {
 542
 543                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 544                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 545                     atomic_read(&sess_p->session_logout) ||
 546                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 547                         continue;
 548                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 549                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 550                         iscsit_inc_session_usage_count(sess_p);
 551                         iscsit_stop_time2retain_timer(sess_p);
 552                         sess = sess_p;
 553                         break;
 554                 }
 555         }
 556         spin_unlock_bh(&se_tpg->session_lock);
 557
 558         /*
 559          * If the Time2Retain handler has expired, the session is already gone.
 560          */
 561         if (!sess) {
 562                 pr_err("Initiator attempting to add a connection to"
 563                         " a non-existent session, rejecting iSCSI Login.\n");
 564                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 565                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 566                 return -1;
 567         }
 568
 569         /*
 570          * Stop the Time2Retain timer if this is a failed session, we restart
 571          * the timer if the login is not successful.
 572          */
 573         spin_lock_bh(&sess->conn_lock);
 574         if (sess->session_state == TARG_SESS_STATE_FAILED)
 575                 atomic_set(&sess->session_continuation, 1);
 576         spin_unlock_bh(&sess->conn_lock);
 577
 578         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 579
 580         if (iscsi_copy_param_list(&conn->param_list,
 581                         conn->tpg->param_list, 0) < 0) {
 582                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 583                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 584                 return -1;
 585         }
 586
 587         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 588                 iser = true;
 589
 590         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 591         /*
 592          * Need to send TargetPortalGroupTag back in first login response
 593          * on any iSCSI connection where the Initiator provides TargetName.
 594          * See 5.3.1.  Login Phase Start
 595          *
 596          * In our case, we have already located the struct iscsi_tiqn at this point.
 597          */
 598         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 599                 return -1;
 600
 601         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 602 }
 603
 604 int iscsi_login_post_auth_non_zero_tsih(
 605         struct iscsi_conn *conn,
 606         u16 cid,
 607         u32 exp_statsn)
 608 {
 609         struct iscsi_conn *conn_ptr = NULL;
 610         struct iscsi_conn_recovery *cr = NULL;
 611         struct iscsi_session *sess = conn->sess;
 612
 613         /*
 614          * By following item 5 in the login table,  if we have found
 615          * an existing ISID and a valid/existing TSIH and an existing
 616          * CID we do connection reinstatement.  Currently we dont not
 617          * support it so we send back an non-zero status class to the
 618          * initiator and release the new connection.
 619          */
 620         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 621         if (conn_ptr) {
 622                 pr_err("Connection exists with CID %hu for %s,"
 623                         " performing connection reinstatement.\n",
 624                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 625
 626                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 627                 iscsit_dec_conn_usage_count(conn_ptr);
 628         }
 629
 630         /*
 631          * Check for any connection recovery entires containing CID.
 632          * We use the original ExpStatSN sent in the first login request
 633          * to acknowledge commands for the failed connection.
 634          *
 635          * Also note that an explict logout may have already been sent,
 636          * but the response may not be sent due to additional connection
 637          * loss.
 638          */
 639         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 640                 cr = iscsit_get_inactive_connection_recovery_entry(
 641                                 sess, cid);
 642                 if (cr) {
 643                         pr_debug("Performing implicit logout"
 644                                 " for connection recovery on CID: %hu\n",
 645                                         conn->cid);
 646                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 647                 }
 648         }
 649
 650         /*
 651          * Else we follow item 4 from the login table in that we have
 652          * found an existing ISID and a valid/existing TSIH and a new
 653          * CID we go ahead and continue to add a new connection to the
 654          * session.
 655          */
 656         pr_debug("Adding CID %hu to existing session for %s.\n",
 657                         cid, sess->sess_ops->InitiatorName);
 658
 659         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 660                 pr_err("Adding additional connection to this session"
 661                         " would exceed MaxConnections %d, login failed.\n",
 662                                 sess->sess_ops->MaxConnections);
 663                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 664                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 665                 return -1;
 666         }
 667
 668         return 0;
 669 }
 670
 671 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 672 {
 673         struct iscsi_session *sess = conn->sess;
 674         /*
 675          * FIXME: Unsolicitied NopIN support for ISER
 676          */
 677         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 678                 return;
 679
 680         if (!sess->sess_ops->SessionType)
 681                 iscsit_start_nopin_timer(conn);
 682 }
 683
 684 int iscsi_post_login_handler(
 685         struct iscsi_np *np,
 686         struct iscsi_conn *conn,
 687         u8 zero_tsih)
 688 {
 689         int stop_timer = 0;
 690         struct iscsi_session *sess = conn->sess;
 691         struct se_session *se_sess = sess->se_sess;
 692         struct iscsi_portal_group *tpg = sess->tpg;
 693         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 694         struct iscsi_thread_set *ts;
 695
 696         iscsit_inc_conn_usage_count(conn);
 697
 698         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 699                         ISCSI_LOGIN_STATUS_ACCEPT);
 700
 701         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 702         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 703
 704         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 705         iscsit_set_sync_and_steering_values(conn);
 706         /*
 707          * SCSI Initiator -> SCSI Target Port Mapping
 708          */
 709         ts = iscsi_get_thread_set();
 710         if (!zero_tsih) {
 711                 iscsi_set_session_parameters(sess->sess_ops,
 712                                 conn->param_list, 0);
 713                 iscsi_release_param_list(conn->param_list);
 714                 conn->param_list = NULL;
 715
 716                 spin_lock_bh(&sess->conn_lock);
 717                 atomic_set(&sess->session_continuation, 0);
 718                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 719                         pr_debug("Moving to"
 720                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 721                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 722                         stop_timer = 1;
 723                 }
 724
 725                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 726                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 727                         conn->local_ip, conn->local_port, tpg->tpgt);
 728
 729                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 730                 atomic_inc(&sess->nconn);
 731                 pr_debug("Incremented iSCSI Connection count to %hu"
 732                         " from node: %s\n", atomic_read(&sess->nconn),
 733                         sess->sess_ops->InitiatorName);
 734                 spin_unlock_bh(&sess->conn_lock);
 735
 736                 iscsi_post_login_start_timers(conn);
 737
 738                 iscsi_activate_thread_set(conn, ts);
 739                 /*
 740                  * Determine CPU mask to ensure connection's RX and TX kthreads
 741                  * are scheduled on the same CPU.
 742                  */
 743                 iscsit_thread_get_cpumask(conn);
 744                 conn->conn_rx_reset_cpumask = 1;
 745                 conn->conn_tx_reset_cpumask = 1;
 746
 747                 iscsit_dec_conn_usage_count(conn);
 748                 if (stop_timer) {
 749                         spin_lock_bh(&se_tpg->session_lock);
 750                         iscsit_stop_time2retain_timer(sess);
 751                         spin_unlock_bh(&se_tpg->session_lock);
 752                 }
 753                 iscsit_dec_session_usage_count(sess);
 754                 return 0;
 755         }
 756
 757         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 758         iscsi_release_param_list(conn->param_list);
 759         conn->param_list = NULL;
 760
 761         iscsit_determine_maxcmdsn(sess);
 762
 763         spin_lock_bh(&se_tpg->session_lock);
 764         __transport_register_session(&sess->tpg->tpg_se_tpg,
 765                         se_sess->se_node_acl, se_sess, sess);
 766         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 767         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 768
 769         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 770                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 771                 tpg->tpgt);
 772
 773         spin_lock_bh(&sess->conn_lock);
 774         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 775         atomic_inc(&sess->nconn);
 776         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 777                 " %s\n", atomic_read(&sess->nconn),
 778                 sess->sess_ops->InitiatorName);
 779         spin_unlock_bh(&sess->conn_lock);
 780
 781         sess->sid = tpg->sid++;
 782         if (!sess->sid)
 783                 sess->sid = tpg->sid++;
 784         pr_debug("Established iSCSI session from node: %s\n",
 785                         sess->sess_ops->InitiatorName);
 786
 787         tpg->nsessions++;
 788         if (tpg->tpg_tiqn)
 789                 tpg->tpg_tiqn->tiqn_nsessions++;
 790
 791         pr_debug("Incremented number of active iSCSI sessions to %u on"
 792                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 793         spin_unlock_bh(&se_tpg->session_lock);
 794
 795         iscsi_post_login_start_timers(conn);
 796         iscsi_activate_thread_set(conn, ts);
 797         /*
 798          * Determine CPU mask to ensure connection's RX and TX kthreads
 799          * are scheduled on the same CPU.
 800          */
 801         iscsit_thread_get_cpumask(conn);
 802         conn->conn_rx_reset_cpumask = 1;
 803         conn->conn_tx_reset_cpumask = 1;
 804
 805         iscsit_dec_conn_usage_count(conn);
 806
 807         return 0;
 808 }
 809
 810 static void iscsi_handle_login_thread_timeout(unsigned long data)
 811 {
 812         struct iscsi_np *np = (struct iscsi_np *) data;
 813
 814         spin_lock_bh(&np->np_thread_lock);
 815         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 816                         np->np_ip, np->np_port);
 817
 818         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 819                 spin_unlock_bh(&np->np_thread_lock);
 820                 return;
 821         }
 822
 823         if (np->np_thread)
 824                 send_sig(SIGINT, np->np_thread, 1);
 825
 826         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 827         spin_unlock_bh(&np->np_thread_lock);
 828 }
 829
 830 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 831 {
 832         /*
 833          * This used the TA_LOGIN_TIMEOUT constant because at this
 834          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 835          */
 836         spin_lock_bh(&np->np_thread_lock);
 837         init_timer(&np->np_login_timer);
 838         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 839         np->np_login_timer.data = (unsigned long)np;
 840         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 841         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 842         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 843         add_timer(&np->np_login_timer);
 844
 845         pr_debug("Added timeout timer to iSCSI login request for"
 846                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 847         spin_unlock_bh(&np->np_thread_lock);
 848 }
 849
 850 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 851 {
 852         spin_lock_bh(&np->np_thread_lock);
 853         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 854                 spin_unlock_bh(&np->np_thread_lock);
 855                 return;
 856         }
 857         np->np_login_timer_flags |= ISCSI_TF_STOP;
 858         spin_unlock_bh(&np->np_thread_lock);
 859
 860         del_timer_sync(&np->np_login_timer);
 861
 862         spin_lock_bh(&np->np_thread_lock);
 863         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 864         spin_unlock_bh(&np->np_thread_lock);
 865 }
 866
 867 int iscsit_setup_np(
 868         struct iscsi_np *np,
 869         struct __kernel_sockaddr_storage *sockaddr)
 870 {
 871         struct socket *sock = NULL;
 872         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 873
 874         switch (np->np_network_transport) {
 875         case ISCSI_TCP:
 876                 np->np_ip_proto = IPPROTO_TCP;
 877                 np->np_sock_type = SOCK_STREAM;
 878                 break;
 879         case ISCSI_SCTP_TCP:
 880                 np->np_ip_proto = IPPROTO_SCTP;
 881                 np->np_sock_type = SOCK_STREAM;
 882                 break;
 883         case ISCSI_SCTP_UDP:
 884                 np->np_ip_proto = IPPROTO_SCTP;
 885                 np->np_sock_type = SOCK_SEQPACKET;
 886                 break;
 887         default:
 888                 pr_err("Unsupported network_transport: %d\n",
 889                                 np->np_network_transport);
 890                 return -EINVAL;
 891         }
 892
 893         np->np_ip_proto = IPPROTO_TCP;
 894         np->np_sock_type = SOCK_STREAM;
 895
 896         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 897                         np->np_ip_proto, &sock);
 898         if (ret < 0) {
 899                 pr_err("sock_create() failed.\n");
 900                 return ret;
 901         }
 902         np->np_socket = sock;
 903         /*
 904          * Setup the np->np_sockaddr from the passed sockaddr setup
 905          * in iscsi_target_configfs.c code..
 906          */
 907         memcpy(&np->np_sockaddr, sockaddr,
 908                         sizeof(struct __kernel_sockaddr_storage));
 909
 910         if (sockaddr->ss_family == AF_INET6)
 911                 len = sizeof(struct sockaddr_in6);
 912         else
 913                 len = sizeof(struct sockaddr_in);
 914         /*
 915          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 916          */
 917         /* FIXME: Someone please explain why this is endian-safe */
 918         opt = 1;
 919         if (np->np_network_transport == ISCSI_TCP) {
 920                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 921                                 (char *)&opt, sizeof(opt));
 922                 if (ret < 0) {
 923                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 924                                 " failed: %d\n", ret);
 925                         goto fail;
 926                 }
 927         }
 928
 929         /* FIXME: Someone please explain why this is endian-safe */
 930         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 931                         (char *)&opt, sizeof(opt));
 932         if (ret < 0) {
 933                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 934                         " failed\n");
 935                 goto fail;
 936         }
 937
 938         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 939                         (char *)&opt, sizeof(opt));
 940         if (ret < 0) {
 941                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 942                         " failed\n");
 943                 goto fail;
 944         }
 945
 946         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 947         if (ret < 0) {
 948                 pr_err("kernel_bind() failed: %d\n", ret);
 949                 goto fail;
 950         }
 951
 952         ret = kernel_listen(sock, backlog);
 953         if (ret != 0) {
 954                 pr_err("kernel_listen() failed: %d\n", ret);
 955                 goto fail;
 956         }
 957
 958         return 0;
 959 fail:
 960         np->np_socket = NULL;
 961         if (sock)
 962                 sock_release(sock);
 963         return ret;
 964 }
 965
 966 int iscsi_target_setup_login_socket(
 967         struct iscsi_np *np,
 968         struct __kernel_sockaddr_storage *sockaddr)
 969 {
 970         struct iscsit_transport *t;
 971         int rc;
 972
 973         t = iscsit_get_transport(np->np_network_transport);
 974         if (!t)
 975                 return -EINVAL;
 976
 977         rc = t->iscsit_setup_np(np, sockaddr);
 978         if (rc < 0) {
 979                 iscsit_put_transport(t);
 980                 return rc;
 981         }
 982
 983         np->np_transport = t;
 984         np->enabled = true;
 985         return 0;
 986 }
 987
 988 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 989 {
 990         struct socket *new_sock, *sock = np->np_socket;
 991         struct sockaddr_in sock_in;
 992         struct sockaddr_in6 sock_in6;
 993         int rc, err;
 994
 995         rc = kernel_accept(sock, &new_sock, 0);
 996         if (rc < 0)
 997                 return rc;
 998
 999         conn->sock = new_sock;
1000         conn->login_family = np->np_sockaddr.ss_family;
1001
1002         if (np->np_sockaddr.ss_family == AF_INET6) {
1003                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1004
1005                 rc = conn->sock->ops->getname(conn->sock,
1006                                 (struct sockaddr *)&sock_in6, &err, 1);
1007                 if (!rc) {
1008                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1009                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1010                                         &sock_in6.sin6_addr.in6_u);
1011                         else
1012                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1013                                         &sock_in6.sin6_addr.s6_addr32[3]);
1014                         conn->login_port = ntohs(sock_in6.sin6_port);
1015                 }
1016
1017                 rc = conn->sock->ops->getname(conn->sock,
1018                                 (struct sockaddr *)&sock_in6, &err, 0);
1019                 if (!rc) {
1020                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1021                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1022                                         &sock_in6.sin6_addr.in6_u);
1023                         else
1024                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1025                                         &sock_in6.sin6_addr.s6_addr32[3]);
1026                         conn->local_port = ntohs(sock_in6.sin6_port);
1027                 }
1028         } else {
1029                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1030
1031                 rc = conn->sock->ops->getname(conn->sock,
1032                                 (struct sockaddr *)&sock_in, &err, 1);
1033                 if (!rc) {
1034                         sprintf(conn->login_ip, "%pI4",
1035                                         &sock_in.sin_addr.s_addr);
1036                         conn->login_port = ntohs(sock_in.sin_port);
1037                 }
1038
1039                 rc = conn->sock->ops->getname(conn->sock,
1040                                 (struct sockaddr *)&sock_in, &err, 0);
1041                 if (!rc) {
1042                         sprintf(conn->local_ip, "%pI4",
1043                                         &sock_in.sin_addr.s_addr);
1044                         conn->local_port = ntohs(sock_in.sin_port);
1045                 }
1046         }
1047
1048         return 0;
1049 }
1050
1051 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1052 {
1053         struct iscsi_login_req *login_req;
1054         u32 padding = 0, payload_length;
1055
1056         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1057                 return -1;
1058
1059         login_req = (struct iscsi_login_req *)login->req;
1060         payload_length  = ntoh24(login_req->dlength);
1061         padding = ((-payload_length) & 3);
1062
1063         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1064                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1065                 login_req->flags, login_req->itt, login_req->cmdsn,
1066                 login_req->exp_statsn, login_req->cid, payload_length);
1067         /*
1068          * Setup the initial iscsi_login values from the leading
1069          * login request PDU.
1070          */
1071         if (login->first_request) {
1072                 login_req = (struct iscsi_login_req *)login->req;
1073                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1074                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1075                 login->version_min      = login_req->min_version;
1076                 login->version_max      = login_req->max_version;
1077                 memcpy(login->isid, login_req->isid, 6);
1078                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1079                 login->init_task_tag    = login_req->itt;
1080                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1081                 login->cid              = be16_to_cpu(login_req->cid);
1082                 login->tsih             = be16_to_cpu(login_req->tsih);
1083         }
1084
1085         if (iscsi_target_check_login_request(conn, login) < 0)
1086                 return -1;
1087
1088         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1089         if (iscsi_login_rx_data(conn, login->req_buf,
1090                                 payload_length + padding) < 0)
1091                 return -1;
1092
1093         return 0;
1094 }
1095
1096 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1097                         u32 length)
1098 {
1099         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1100                 return -1;
1101
1102         return 0;
1103 }
1104
1105 static int
1106 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1107 {
1108         int rc;
1109
1110         if (!t->owner) {
1111                 conn->conn_transport = t;
1112                 return 0;
1113         }
1114
1115         rc = try_module_get(t->owner);
1116         if (!rc) {
1117                 pr_err("try_module_get() failed for %s\n", t->name);
1118                 return -EINVAL;
1119         }
1120
1121         conn->conn_transport = t;
1122         return 0;
1123 }
1124
1125 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1126                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1127 {
1128         if (new_sess == false)
1129                 goto old_sess_out;
1130
1131         pr_err("iSCSI Login negotiation failed.\n");
1132         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1133                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1134         if (!zero_tsih || !conn->sess)
1135                 goto old_sess_out;
1136         if (conn->sess->se_sess)
1137                 transport_free_session(conn->sess->se_sess);
1138         if (conn->sess->session_index != 0) {
1139                 spin_lock_bh(&sess_idr_lock);
1140                 idr_remove(&sess_idr, conn->sess->session_index);
1141                 spin_unlock_bh(&sess_idr_lock);
1142         }
1143         kfree(conn->sess->sess_ops);
1144         kfree(conn->sess);
1145
1146 old_sess_out:
1147         iscsi_stop_login_thread_timer(np);
1148         /*
1149          * If login negotiation fails check if the Time2Retain timer
1150          * needs to be restarted.
1151          */
1152         if (!zero_tsih && conn->sess) {
1153                 spin_lock_bh(&conn->sess->conn_lock);
1154                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1155                         struct se_portal_group *se_tpg =
1156                                         &conn->tpg->tpg_se_tpg;
1157
1158                         atomic_set(&conn->sess->session_continuation, 0);
1159                         spin_unlock_bh(&conn->sess->conn_lock);
1160                         spin_lock_bh(&se_tpg->session_lock);
1161                         iscsit_start_time2retain_handler(conn->sess);
1162                         spin_unlock_bh(&se_tpg->session_lock);
1163                 } else
1164                         spin_unlock_bh(&conn->sess->conn_lock);
1165                 iscsit_dec_session_usage_count(conn->sess);
1166         }
1167
1168         if (!IS_ERR(conn->conn_rx_hash.tfm))
1169                 crypto_free_hash(conn->conn_rx_hash.tfm);
1170         if (!IS_ERR(conn->conn_tx_hash.tfm))
1171                 crypto_free_hash(conn->conn_tx_hash.tfm);
1172
1173         if (conn->conn_cpumask)
1174                 free_cpumask_var(conn->conn_cpumask);
1175
1176         kfree(conn->conn_ops);
1177
1178         if (conn->param_list) {
1179                 iscsi_release_param_list(conn->param_list);
1180                 conn->param_list = NULL;
1181         }
1182         iscsi_target_nego_release(conn);
1183
1184         if (conn->sock) {
1185                 sock_release(conn->sock);
1186                 conn->sock = NULL;
1187         }
1188
1189         if (conn->conn_transport->iscsit_free_conn)
1190                 conn->conn_transport->iscsit_free_conn(conn);
1191
1192         iscsit_put_transport(conn->conn_transport);
1193         kfree(conn);
1194 }
1195
1196 static int __iscsi_target_login_thread(struct iscsi_np *np)
1197 {
1198         u8 *buffer, zero_tsih = 0;
1199         int ret = 0, rc;
1200         struct iscsi_conn *conn = NULL;
1201         struct iscsi_login *login;
1202         struct iscsi_portal_group *tpg = NULL;
1203         struct iscsi_login_req *pdu;
1204         struct iscsi_tpg_np *tpg_np;
1205         bool new_sess = false;
1206
1207         flush_signals(current);
1208
1209         spin_lock_bh(&np->np_thread_lock);
1210         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1211                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1212                 complete(&np->np_restart_comp);
1213         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1214                 spin_unlock_bh(&np->np_thread_lock);
1215                 goto exit;
1216         } else {
1217                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1218         }
1219         spin_unlock_bh(&np->np_thread_lock);
1220
1221         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1222         if (!conn) {
1223                 pr_err("Could not allocate memory for"
1224                         " new connection\n");
1225                 /* Get another socket */
1226                 return 1;
1227         }
1228         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1229         conn->conn_state = TARG_CONN_STATE_FREE;
1230
1231         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1232                 kfree(conn);
1233                 return 1;
1234         }
1235
1236         rc = np->np_transport->iscsit_accept_np(np, conn);
1237         if (rc == -ENOSYS) {
1238                 complete(&np->np_restart_comp);
1239                 iscsit_put_transport(conn->conn_transport);
1240                 kfree(conn);
1241                 conn = NULL;
1242                 goto exit;
1243         } else if (rc < 0) {
1244                 spin_lock_bh(&np->np_thread_lock);
1245                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1246                         spin_unlock_bh(&np->np_thread_lock);
1247                         complete(&np->np_restart_comp);
1248                         iscsit_put_transport(conn->conn_transport);
1249                         kfree(conn);
1250                         conn = NULL;
1251                         if (ret == -ENODEV)
1252                                 goto out;
1253                         /* Get another socket */
1254                         return 1;
1255                 }
1256                 spin_unlock_bh(&np->np_thread_lock);
1257                 iscsit_put_transport(conn->conn_transport);
1258                 kfree(conn);
1259                 conn = NULL;
1260                 goto out;
1261         }
1262         /*
1263          * Perform the remaining iSCSI connection initialization items..
1264          */
1265         login = iscsi_login_init_conn(conn);
1266         if (!login) {
1267                 goto new_sess_out;
1268         }
1269
1270         iscsi_start_login_thread_timer(np);
1271
1272         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1273         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1274         /*
1275          * This will process the first login request + payload..
1276          */
1277         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1278         if (rc == 1)
1279                 return 1;
1280         else if (rc < 0)
1281                 goto new_sess_out;
1282
1283         buffer = &login->req[0];
1284         pdu = (struct iscsi_login_req *)buffer;
1285         /*
1286          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1287          * when Status-Class != 0.
1288         */
1289         conn->login_itt = pdu->itt;
1290
1291         spin_lock_bh(&np->np_thread_lock);
1292         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1293                 spin_unlock_bh(&np->np_thread_lock);
1294                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1295                         " active.\n", np->np_ip, np->np_port);
1296                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1297                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1298                 goto new_sess_out;
1299         }
1300         spin_unlock_bh(&np->np_thread_lock);
1301
1302         conn->network_transport = np->np_network_transport;
1303
1304         pr_debug("Received iSCSI login request from %s on %s Network"
1305                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1306                 conn->local_ip, conn->local_port);
1307
1308         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1309         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1310
1311         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1312                         pdu->min_version) < 0)
1313                 goto new_sess_out;
1314
1315         zero_tsih = (pdu->tsih == 0x0000);
1316         if (zero_tsih) {
1317                 /*
1318                  * This is the leading connection of a new session.
1319                  * We wait until after authentication to check for
1320                  * session reinstatement.
1321                  */
1322                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1323                         goto new_sess_out;
1324         } else {
1325                 /*
1326                  * Add a new connection to an existing session.
1327                  * We check for a non-existant session in
1328                  * iscsi_login_non_zero_tsih_s2() below based
1329                  * on ISID/TSIH, but wait until after authentication
1330                  * to check for connection reinstatement, etc.
1331                  */
1332                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1333                         goto new_sess_out;
1334         }
1335         /*
1336          * SessionType: Discovery
1337          *
1338          *      Locates Default Portal
1339          *
1340          * SessionType: Normal
1341          *
1342          *      Locates Target Portal from NP -> Target IQN
1343          */
1344         rc = iscsi_target_locate_portal(np, conn, login);
1345         if (rc < 0) {
1346                 tpg = conn->tpg;
1347                 goto new_sess_out;
1348         }
1349         login->zero_tsih = zero_tsih;
1350
1351         tpg = conn->tpg;
1352         if (!tpg) {
1353                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1354                 goto new_sess_out;
1355         }
1356
1357         if (zero_tsih) {
1358                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1359                         goto new_sess_out;
1360         } else {
1361                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1362                         goto old_sess_out;
1363         }
1364
1365         ret = iscsi_target_start_negotiation(login, conn);
1366         if (ret < 0)
1367                 goto new_sess_out;
1368
1369         if (!conn->sess) {
1370                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1371                 goto new_sess_out;
1372         }
1373
1374         iscsi_stop_login_thread_timer(np);
1375
1376         if (signal_pending(current))
1377                 goto new_sess_out;
1378
1379         if (ret == 1) {
1380                 tpg_np = conn->tpg_np;
1381
1382                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1383                 if (ret < 0)
1384                         goto new_sess_out;
1385
1386                 iscsit_deaccess_np(np, tpg, tpg_np);
1387         }
1388
1389         tpg = NULL;
1390         tpg_np = NULL;
1391         /* Get another socket */
1392         return 1;
1393
1394 new_sess_out:
1395         new_sess = true;
1396 old_sess_out:
1397         tpg_np = conn->tpg_np;
1398         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1399         new_sess = false;
1400
1401         if (tpg) {
1402                 iscsit_deaccess_np(np, tpg, tpg_np);
1403                 tpg = NULL;
1404                 tpg_np = NULL;
1405         }
1406
1407 out:
1408         return 1;
1409
1410 exit:
1411         iscsi_stop_login_thread_timer(np);
1412         spin_lock_bh(&np->np_thread_lock);
1413         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1414         spin_unlock_bh(&np->np_thread_lock);
1415
1416         return 0;
1417 }
1418
1419 int iscsi_target_login_thread(void *arg)
1420 {
1421         struct iscsi_np *np = arg;
1422         int ret;
1423
1424         allow_signal(SIGINT);
1425
1426         while (1) {
1427                 ret = __iscsi_target_login_thread(np);
1428                 /*
1429                  * We break and exit here unless another sock_accept() call
1430                  * is expected.
1431                  */
1432                 if (ret != 1)
1433                         break;
1434         }
1435
1436         return 0;
1437 }