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(TARGET_PROT_NORMAL);
 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                         goto check_prot;
 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                  * ISER currently requires that ImmediateData + Unsolicited
 459                  * Data be disabled when protection / signature MRs are enabled.
 460                  */
 461 check_prot:
 462                 if (sess->se_sess->sup_prot_ops &
 463                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 464                     TARGET_PROT_DOUT_INSERT)) {
 465
 466                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 467                                 return -1;
 468
 469                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 470                                 return -1;
 471
 472                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 473                                  " T10-PI enabled ISER session\n");
 474                 }
 475         }
 476
 477         return 0;
 478 }
 479
 480 /*
 481  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 482  * The Initiator node will be able to enable FIM by proposing them itself.
 483  */
 484 int iscsi_login_disable_FIM_keys(
 485         struct iscsi_param_list *param_list,
 486         struct iscsi_conn *conn)
 487 {
 488         struct iscsi_param *param;
 489
 490         param = iscsi_find_param_from_key("OFMarker", param_list);
 491         if (!param) {
 492                 pr_err("iscsi_find_param_from_key() for"
 493                                 " OFMarker 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("OFMarkInt", 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         param = iscsi_find_param_from_key("IFMarker", param_list);
 511         if (!param) {
 512                 pr_err("iscsi_find_param_from_key() for"
 513                                 " IFMarker failed\n");
 514                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 515                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 516                 return -1;
 517         }
 518         param->state &= ~PSTATE_NEGOTIATE;
 519
 520         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 521         if (!param) {
 522                 pr_err("iscsi_find_param_from_key() for"
 523                                 " IFMarker failed\n");
 524                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 525                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 526                 return -1;
 527         }
 528         param->state &= ~PSTATE_NEGOTIATE;
 529
 530         return 0;
 531 }
 532
 533 static int iscsi_login_non_zero_tsih_s1(
 534         struct iscsi_conn *conn,
 535         unsigned char *buf)
 536 {
 537         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 538
 539         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 540         return 0;
 541 }
 542
 543 /*
 544  *      Add a new connection to an existing session.
 545  */
 546 static int iscsi_login_non_zero_tsih_s2(
 547         struct iscsi_conn *conn,
 548         unsigned char *buf)
 549 {
 550         struct iscsi_portal_group *tpg = conn->tpg;
 551         struct iscsi_session *sess = NULL, *sess_p = NULL;
 552         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 553         struct se_session *se_sess, *se_sess_tmp;
 554         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 555         bool iser = false;
 556
 557         spin_lock_bh(&se_tpg->session_lock);
 558         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 559                         sess_list) {
 560
 561                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 562                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 563                     atomic_read(&sess_p->session_logout) ||
 564                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 565                         continue;
 566                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 567                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 568                         iscsit_inc_session_usage_count(sess_p);
 569                         iscsit_stop_time2retain_timer(sess_p);
 570                         sess = sess_p;
 571                         break;
 572                 }
 573         }
 574         spin_unlock_bh(&se_tpg->session_lock);
 575
 576         /*
 577          * If the Time2Retain handler has expired, the session is already gone.
 578          */
 579         if (!sess) {
 580                 pr_err("Initiator attempting to add a connection to"
 581                         " a non-existent session, rejecting iSCSI Login.\n");
 582                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 583                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 584                 return -1;
 585         }
 586
 587         /*
 588          * Stop the Time2Retain timer if this is a failed session, we restart
 589          * the timer if the login is not successful.
 590          */
 591         spin_lock_bh(&sess->conn_lock);
 592         if (sess->session_state == TARG_SESS_STATE_FAILED)
 593                 atomic_set(&sess->session_continuation, 1);
 594         spin_unlock_bh(&sess->conn_lock);
 595
 596         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 597
 598         if (iscsi_copy_param_list(&conn->param_list,
 599                         conn->tpg->param_list, 0) < 0) {
 600                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 601                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 602                 return -1;
 603         }
 604
 605         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 606                 iser = true;
 607
 608         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 609         /*
 610          * Need to send TargetPortalGroupTag back in first login response
 611          * on any iSCSI connection where the Initiator provides TargetName.
 612          * See 5.3.1.  Login Phase Start
 613          *
 614          * In our case, we have already located the struct iscsi_tiqn at this point.
 615          */
 616         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 617                 return -1;
 618
 619         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 620 }
 621
 622 int iscsi_login_post_auth_non_zero_tsih(
 623         struct iscsi_conn *conn,
 624         u16 cid,
 625         u32 exp_statsn)
 626 {
 627         struct iscsi_conn *conn_ptr = NULL;
 628         struct iscsi_conn_recovery *cr = NULL;
 629         struct iscsi_session *sess = conn->sess;
 630
 631         /*
 632          * By following item 5 in the login table,  if we have found
 633          * an existing ISID and a valid/existing TSIH and an existing
 634          * CID we do connection reinstatement.  Currently we dont not
 635          * support it so we send back an non-zero status class to the
 636          * initiator and release the new connection.
 637          */
 638         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 639         if (conn_ptr) {
 640                 pr_err("Connection exists with CID %hu for %s,"
 641                         " performing connection reinstatement.\n",
 642                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 643
 644                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 645                 iscsit_dec_conn_usage_count(conn_ptr);
 646         }
 647
 648         /*
 649          * Check for any connection recovery entires containing CID.
 650          * We use the original ExpStatSN sent in the first login request
 651          * to acknowledge commands for the failed connection.
 652          *
 653          * Also note that an explict logout may have already been sent,
 654          * but the response may not be sent due to additional connection
 655          * loss.
 656          */
 657         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 658                 cr = iscsit_get_inactive_connection_recovery_entry(
 659                                 sess, cid);
 660                 if (cr) {
 661                         pr_debug("Performing implicit logout"
 662                                 " for connection recovery on CID: %hu\n",
 663                                         conn->cid);
 664                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 665                 }
 666         }
 667
 668         /*
 669          * Else we follow item 4 from the login table in that we have
 670          * found an existing ISID and a valid/existing TSIH and a new
 671          * CID we go ahead and continue to add a new connection to the
 672          * session.
 673          */
 674         pr_debug("Adding CID %hu to existing session for %s.\n",
 675                         cid, sess->sess_ops->InitiatorName);
 676
 677         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 678                 pr_err("Adding additional connection to this session"
 679                         " would exceed MaxConnections %d, login failed.\n",
 680                                 sess->sess_ops->MaxConnections);
 681                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 682                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 683                 return -1;
 684         }
 685
 686         return 0;
 687 }
 688
 689 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 690 {
 691         struct iscsi_session *sess = conn->sess;
 692         /*
 693          * FIXME: Unsolicitied NopIN support for ISER
 694          */
 695         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 696                 return;
 697
 698         if (!sess->sess_ops->SessionType)
 699                 iscsit_start_nopin_timer(conn);
 700 }
 701
 702 int iscsi_post_login_handler(
 703         struct iscsi_np *np,
 704         struct iscsi_conn *conn,
 705         u8 zero_tsih)
 706 {
 707         int stop_timer = 0;
 708         struct iscsi_session *sess = conn->sess;
 709         struct se_session *se_sess = sess->se_sess;
 710         struct iscsi_portal_group *tpg = sess->tpg;
 711         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 712         struct iscsi_thread_set *ts;
 713
 714         iscsit_inc_conn_usage_count(conn);
 715
 716         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 717                         ISCSI_LOGIN_STATUS_ACCEPT);
 718
 719         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 720         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 721
 722         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 723         iscsit_set_sync_and_steering_values(conn);
 724         /*
 725          * SCSI Initiator -> SCSI Target Port Mapping
 726          */
 727         ts = iscsi_get_thread_set();
 728         if (!zero_tsih) {
 729                 iscsi_set_session_parameters(sess->sess_ops,
 730                                 conn->param_list, 0);
 731                 iscsi_release_param_list(conn->param_list);
 732                 conn->param_list = NULL;
 733
 734                 spin_lock_bh(&sess->conn_lock);
 735                 atomic_set(&sess->session_continuation, 0);
 736                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 737                         pr_debug("Moving to"
 738                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 739                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 740                         stop_timer = 1;
 741                 }
 742
 743                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 744                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 745                         conn->local_ip, conn->local_port, tpg->tpgt);
 746
 747                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 748                 atomic_inc(&sess->nconn);
 749                 pr_debug("Incremented iSCSI Connection count to %hu"
 750                         " from node: %s\n", atomic_read(&sess->nconn),
 751                         sess->sess_ops->InitiatorName);
 752                 spin_unlock_bh(&sess->conn_lock);
 753
 754                 iscsi_post_login_start_timers(conn);
 755
 756                 iscsi_activate_thread_set(conn, ts);
 757                 /*
 758                  * Determine CPU mask to ensure connection's RX and TX kthreads
 759                  * are scheduled on the same CPU.
 760                  */
 761                 iscsit_thread_get_cpumask(conn);
 762                 conn->conn_rx_reset_cpumask = 1;
 763                 conn->conn_tx_reset_cpumask = 1;
 764
 765                 iscsit_dec_conn_usage_count(conn);
 766                 if (stop_timer) {
 767                         spin_lock_bh(&se_tpg->session_lock);
 768                         iscsit_stop_time2retain_timer(sess);
 769                         spin_unlock_bh(&se_tpg->session_lock);
 770                 }
 771                 iscsit_dec_session_usage_count(sess);
 772                 return 0;
 773         }
 774
 775         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 776         iscsi_release_param_list(conn->param_list);
 777         conn->param_list = NULL;
 778
 779         iscsit_determine_maxcmdsn(sess);
 780
 781         spin_lock_bh(&se_tpg->session_lock);
 782         __transport_register_session(&sess->tpg->tpg_se_tpg,
 783                         se_sess->se_node_acl, se_sess, sess);
 784         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 785         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 786
 787         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 788                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 789                 tpg->tpgt);
 790
 791         spin_lock_bh(&sess->conn_lock);
 792         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 793         atomic_inc(&sess->nconn);
 794         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 795                 " %s\n", atomic_read(&sess->nconn),
 796                 sess->sess_ops->InitiatorName);
 797         spin_unlock_bh(&sess->conn_lock);
 798
 799         sess->sid = tpg->sid++;
 800         if (!sess->sid)
 801                 sess->sid = tpg->sid++;
 802         pr_debug("Established iSCSI session from node: %s\n",
 803                         sess->sess_ops->InitiatorName);
 804
 805         tpg->nsessions++;
 806         if (tpg->tpg_tiqn)
 807                 tpg->tpg_tiqn->tiqn_nsessions++;
 808
 809         pr_debug("Incremented number of active iSCSI sessions to %u on"
 810                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 811         spin_unlock_bh(&se_tpg->session_lock);
 812
 813         iscsi_post_login_start_timers(conn);
 814         iscsi_activate_thread_set(conn, ts);
 815         /*
 816          * Determine CPU mask to ensure connection's RX and TX kthreads
 817          * are scheduled on the same CPU.
 818          */
 819         iscsit_thread_get_cpumask(conn);
 820         conn->conn_rx_reset_cpumask = 1;
 821         conn->conn_tx_reset_cpumask = 1;
 822
 823         iscsit_dec_conn_usage_count(conn);
 824
 825         return 0;
 826 }
 827
 828 static void iscsi_handle_login_thread_timeout(unsigned long data)
 829 {
 830         struct iscsi_np *np = (struct iscsi_np *) data;
 831
 832         spin_lock_bh(&np->np_thread_lock);
 833         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 834                         np->np_ip, np->np_port);
 835
 836         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 837                 spin_unlock_bh(&np->np_thread_lock);
 838                 return;
 839         }
 840
 841         if (np->np_thread)
 842                 send_sig(SIGINT, np->np_thread, 1);
 843
 844         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 845         spin_unlock_bh(&np->np_thread_lock);
 846 }
 847
 848 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 849 {
 850         /*
 851          * This used the TA_LOGIN_TIMEOUT constant because at this
 852          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 853          */
 854         spin_lock_bh(&np->np_thread_lock);
 855         init_timer(&np->np_login_timer);
 856         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 857         np->np_login_timer.data = (unsigned long)np;
 858         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 859         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 860         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 861         add_timer(&np->np_login_timer);
 862
 863         pr_debug("Added timeout timer to iSCSI login request for"
 864                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 865         spin_unlock_bh(&np->np_thread_lock);
 866 }
 867
 868 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 869 {
 870         spin_lock_bh(&np->np_thread_lock);
 871         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 872                 spin_unlock_bh(&np->np_thread_lock);
 873                 return;
 874         }
 875         np->np_login_timer_flags |= ISCSI_TF_STOP;
 876         spin_unlock_bh(&np->np_thread_lock);
 877
 878         del_timer_sync(&np->np_login_timer);
 879
 880         spin_lock_bh(&np->np_thread_lock);
 881         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 882         spin_unlock_bh(&np->np_thread_lock);
 883 }
 884
 885 int iscsit_setup_np(
 886         struct iscsi_np *np,
 887         struct __kernel_sockaddr_storage *sockaddr)
 888 {
 889         struct socket *sock = NULL;
 890         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 891
 892         switch (np->np_network_transport) {
 893         case ISCSI_TCP:
 894                 np->np_ip_proto = IPPROTO_TCP;
 895                 np->np_sock_type = SOCK_STREAM;
 896                 break;
 897         case ISCSI_SCTP_TCP:
 898                 np->np_ip_proto = IPPROTO_SCTP;
 899                 np->np_sock_type = SOCK_STREAM;
 900                 break;
 901         case ISCSI_SCTP_UDP:
 902                 np->np_ip_proto = IPPROTO_SCTP;
 903                 np->np_sock_type = SOCK_SEQPACKET;
 904                 break;
 905         default:
 906                 pr_err("Unsupported network_transport: %d\n",
 907                                 np->np_network_transport);
 908                 return -EINVAL;
 909         }
 910
 911         np->np_ip_proto = IPPROTO_TCP;
 912         np->np_sock_type = SOCK_STREAM;
 913
 914         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 915                         np->np_ip_proto, &sock);
 916         if (ret < 0) {
 917                 pr_err("sock_create() failed.\n");
 918                 return ret;
 919         }
 920         np->np_socket = sock;
 921         /*
 922          * Setup the np->np_sockaddr from the passed sockaddr setup
 923          * in iscsi_target_configfs.c code..
 924          */
 925         memcpy(&np->np_sockaddr, sockaddr,
 926                         sizeof(struct __kernel_sockaddr_storage));
 927
 928         if (sockaddr->ss_family == AF_INET6)
 929                 len = sizeof(struct sockaddr_in6);
 930         else
 931                 len = sizeof(struct sockaddr_in);
 932         /*
 933          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 934          */
 935         /* FIXME: Someone please explain why this is endian-safe */
 936         opt = 1;
 937         if (np->np_network_transport == ISCSI_TCP) {
 938                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 939                                 (char *)&opt, sizeof(opt));
 940                 if (ret < 0) {
 941                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 942                                 " failed: %d\n", ret);
 943                         goto fail;
 944                 }
 945         }
 946
 947         /* FIXME: Someone please explain why this is endian-safe */
 948         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 949                         (char *)&opt, sizeof(opt));
 950         if (ret < 0) {
 951                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 952                         " failed\n");
 953                 goto fail;
 954         }
 955
 956         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 957                         (char *)&opt, sizeof(opt));
 958         if (ret < 0) {
 959                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 960                         " failed\n");
 961                 goto fail;
 962         }
 963
 964         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 965         if (ret < 0) {
 966                 pr_err("kernel_bind() failed: %d\n", ret);
 967                 goto fail;
 968         }
 969
 970         ret = kernel_listen(sock, backlog);
 971         if (ret != 0) {
 972                 pr_err("kernel_listen() failed: %d\n", ret);
 973                 goto fail;
 974         }
 975
 976         return 0;
 977 fail:
 978         np->np_socket = NULL;
 979         sock_release(sock);
 980         return ret;
 981 }
 982
 983 int iscsi_target_setup_login_socket(
 984         struct iscsi_np *np,
 985         struct __kernel_sockaddr_storage *sockaddr)
 986 {
 987         struct iscsit_transport *t;
 988         int rc;
 989
 990         t = iscsit_get_transport(np->np_network_transport);
 991         if (!t)
 992                 return -EINVAL;
 993
 994         rc = t->iscsit_setup_np(np, sockaddr);
 995         if (rc < 0) {
 996                 iscsit_put_transport(t);
 997                 return rc;
 998         }
 999
1000         np->np_transport = t;
1001         np->enabled = true;
1002         return 0;
1003 }
1004
1005 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1006 {
1007         struct socket *new_sock, *sock = np->np_socket;
1008         struct sockaddr_in sock_in;
1009         struct sockaddr_in6 sock_in6;
1010         int rc, err;
1011
1012         rc = kernel_accept(sock, &new_sock, 0);
1013         if (rc < 0)
1014                 return rc;
1015
1016         conn->sock = new_sock;
1017         conn->login_family = np->np_sockaddr.ss_family;
1018
1019         if (np->np_sockaddr.ss_family == AF_INET6) {
1020                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1021
1022                 rc = conn->sock->ops->getname(conn->sock,
1023                                 (struct sockaddr *)&sock_in6, &err, 1);
1024                 if (!rc) {
1025                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1026                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1027                                         &sock_in6.sin6_addr.in6_u);
1028                         else
1029                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1030                                         &sock_in6.sin6_addr.s6_addr32[3]);
1031                         conn->login_port = ntohs(sock_in6.sin6_port);
1032                 }
1033
1034                 rc = conn->sock->ops->getname(conn->sock,
1035                                 (struct sockaddr *)&sock_in6, &err, 0);
1036                 if (!rc) {
1037                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1038                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1039                                         &sock_in6.sin6_addr.in6_u);
1040                         else
1041                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1042                                         &sock_in6.sin6_addr.s6_addr32[3]);
1043                         conn->local_port = ntohs(sock_in6.sin6_port);
1044                 }
1045         } else {
1046                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1047
1048                 rc = conn->sock->ops->getname(conn->sock,
1049                                 (struct sockaddr *)&sock_in, &err, 1);
1050                 if (!rc) {
1051                         sprintf(conn->login_ip, "%pI4",
1052                                         &sock_in.sin_addr.s_addr);
1053                         conn->login_port = ntohs(sock_in.sin_port);
1054                 }
1055
1056                 rc = conn->sock->ops->getname(conn->sock,
1057                                 (struct sockaddr *)&sock_in, &err, 0);
1058                 if (!rc) {
1059                         sprintf(conn->local_ip, "%pI4",
1060                                         &sock_in.sin_addr.s_addr);
1061                         conn->local_port = ntohs(sock_in.sin_port);
1062                 }
1063         }
1064
1065         return 0;
1066 }
1067
1068 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1069 {
1070         struct iscsi_login_req *login_req;
1071         u32 padding = 0, payload_length;
1072
1073         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1074                 return -1;
1075
1076         login_req = (struct iscsi_login_req *)login->req;
1077         payload_length  = ntoh24(login_req->dlength);
1078         padding = ((-payload_length) & 3);
1079
1080         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1081                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1082                 login_req->flags, login_req->itt, login_req->cmdsn,
1083                 login_req->exp_statsn, login_req->cid, payload_length);
1084         /*
1085          * Setup the initial iscsi_login values from the leading
1086          * login request PDU.
1087          */
1088         if (login->first_request) {
1089                 login_req = (struct iscsi_login_req *)login->req;
1090                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1091                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1092                 login->version_min      = login_req->min_version;
1093                 login->version_max      = login_req->max_version;
1094                 memcpy(login->isid, login_req->isid, 6);
1095                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1096                 login->init_task_tag    = login_req->itt;
1097                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1098                 login->cid              = be16_to_cpu(login_req->cid);
1099                 login->tsih             = be16_to_cpu(login_req->tsih);
1100         }
1101
1102         if (iscsi_target_check_login_request(conn, login) < 0)
1103                 return -1;
1104
1105         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1106         if (iscsi_login_rx_data(conn, login->req_buf,
1107                                 payload_length + padding) < 0)
1108                 return -1;
1109
1110         return 0;
1111 }
1112
1113 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1114                         u32 length)
1115 {
1116         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1117                 return -1;
1118
1119         return 0;
1120 }
1121
1122 static int
1123 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1124 {
1125         int rc;
1126
1127         if (!t->owner) {
1128                 conn->conn_transport = t;
1129                 return 0;
1130         }
1131
1132         rc = try_module_get(t->owner);
1133         if (!rc) {
1134                 pr_err("try_module_get() failed for %s\n", t->name);
1135                 return -EINVAL;
1136         }
1137
1138         conn->conn_transport = t;
1139         return 0;
1140 }
1141
1142 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1143                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1144 {
1145         if (!new_sess)
1146                 goto old_sess_out;
1147
1148         pr_err("iSCSI Login negotiation failed.\n");
1149         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1150                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1151         if (!zero_tsih || !conn->sess)
1152                 goto old_sess_out;
1153         if (conn->sess->se_sess)
1154                 transport_free_session(conn->sess->se_sess);
1155         if (conn->sess->session_index != 0) {
1156                 spin_lock_bh(&sess_idr_lock);
1157                 idr_remove(&sess_idr, conn->sess->session_index);
1158                 spin_unlock_bh(&sess_idr_lock);
1159         }
1160         kfree(conn->sess->sess_ops);
1161         kfree(conn->sess);
1162
1163 old_sess_out:
1164         iscsi_stop_login_thread_timer(np);
1165         /*
1166          * If login negotiation fails check if the Time2Retain timer
1167          * needs to be restarted.
1168          */
1169         if (!zero_tsih && conn->sess) {
1170                 spin_lock_bh(&conn->sess->conn_lock);
1171                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1172                         struct se_portal_group *se_tpg =
1173                                         &conn->tpg->tpg_se_tpg;
1174
1175                         atomic_set(&conn->sess->session_continuation, 0);
1176                         spin_unlock_bh(&conn->sess->conn_lock);
1177                         spin_lock_bh(&se_tpg->session_lock);
1178                         iscsit_start_time2retain_handler(conn->sess);
1179                         spin_unlock_bh(&se_tpg->session_lock);
1180                 } else
1181                         spin_unlock_bh(&conn->sess->conn_lock);
1182                 iscsit_dec_session_usage_count(conn->sess);
1183         }
1184
1185         if (!IS_ERR(conn->conn_rx_hash.tfm))
1186                 crypto_free_hash(conn->conn_rx_hash.tfm);
1187         if (!IS_ERR(conn->conn_tx_hash.tfm))
1188                 crypto_free_hash(conn->conn_tx_hash.tfm);
1189
1190         free_cpumask_var(conn->conn_cpumask);
1191
1192         kfree(conn->conn_ops);
1193
1194         if (conn->param_list) {
1195                 iscsi_release_param_list(conn->param_list);
1196                 conn->param_list = NULL;
1197         }
1198         iscsi_target_nego_release(conn);
1199
1200         if (conn->sock) {
1201                 sock_release(conn->sock);
1202                 conn->sock = NULL;
1203         }
1204
1205         if (conn->conn_transport->iscsit_wait_conn)
1206                 conn->conn_transport->iscsit_wait_conn(conn);
1207
1208         if (conn->conn_transport->iscsit_free_conn)
1209                 conn->conn_transport->iscsit_free_conn(conn);
1210
1211         iscsit_put_transport(conn->conn_transport);
1212         kfree(conn);
1213 }
1214
1215 static int __iscsi_target_login_thread(struct iscsi_np *np)
1216 {
1217         u8 *buffer, zero_tsih = 0;
1218         int ret = 0, rc;
1219         struct iscsi_conn *conn = NULL;
1220         struct iscsi_login *login;
1221         struct iscsi_portal_group *tpg = NULL;
1222         struct iscsi_login_req *pdu;
1223         struct iscsi_tpg_np *tpg_np;
1224         bool new_sess = false;
1225
1226         flush_signals(current);
1227
1228         spin_lock_bh(&np->np_thread_lock);
1229         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1230                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1231                 complete(&np->np_restart_comp);
1232         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1233                 spin_unlock_bh(&np->np_thread_lock);
1234                 goto exit;
1235         } else {
1236                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1237         }
1238         spin_unlock_bh(&np->np_thread_lock);
1239
1240         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1241         if (!conn) {
1242                 pr_err("Could not allocate memory for"
1243                         " new connection\n");
1244                 /* Get another socket */
1245                 return 1;
1246         }
1247         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1248         conn->conn_state = TARG_CONN_STATE_FREE;
1249
1250         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1251                 kfree(conn);
1252                 return 1;
1253         }
1254
1255         rc = np->np_transport->iscsit_accept_np(np, conn);
1256         if (rc == -ENOSYS) {
1257                 complete(&np->np_restart_comp);
1258                 iscsit_put_transport(conn->conn_transport);
1259                 kfree(conn);
1260                 conn = NULL;
1261                 goto exit;
1262         } else if (rc < 0) {
1263                 spin_lock_bh(&np->np_thread_lock);
1264                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1265                         spin_unlock_bh(&np->np_thread_lock);
1266                         complete(&np->np_restart_comp);
1267                         iscsit_put_transport(conn->conn_transport);
1268                         kfree(conn);
1269                         conn = NULL;
1270                         /* Get another socket */
1271                         return 1;
1272                 }
1273                 spin_unlock_bh(&np->np_thread_lock);
1274                 iscsit_put_transport(conn->conn_transport);
1275                 kfree(conn);
1276                 conn = NULL;
1277                 goto out;
1278         }
1279         /*
1280          * Perform the remaining iSCSI connection initialization items..
1281          */
1282         login = iscsi_login_init_conn(conn);
1283         if (!login) {
1284                 goto new_sess_out;
1285         }
1286
1287         iscsi_start_login_thread_timer(np);
1288
1289         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1290         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1291         /*
1292          * This will process the first login request + payload..
1293          */
1294         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1295         if (rc == 1)
1296                 return 1;
1297         else if (rc < 0)
1298                 goto new_sess_out;
1299
1300         buffer = &login->req[0];
1301         pdu = (struct iscsi_login_req *)buffer;
1302         /*
1303          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1304          * when Status-Class != 0.
1305         */
1306         conn->login_itt = pdu->itt;
1307
1308         spin_lock_bh(&np->np_thread_lock);
1309         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1310                 spin_unlock_bh(&np->np_thread_lock);
1311                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1312                         " active.\n", np->np_ip, np->np_port);
1313                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1314                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1315                 goto new_sess_out;
1316         }
1317         spin_unlock_bh(&np->np_thread_lock);
1318
1319         conn->network_transport = np->np_network_transport;
1320
1321         pr_debug("Received iSCSI login request from %s on %s Network"
1322                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1323                 conn->local_ip, conn->local_port);
1324
1325         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1326         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1327
1328         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1329                         pdu->min_version) < 0)
1330                 goto new_sess_out;
1331
1332         zero_tsih = (pdu->tsih == 0x0000);
1333         if (zero_tsih) {
1334                 /*
1335                  * This is the leading connection of a new session.
1336                  * We wait until after authentication to check for
1337                  * session reinstatement.
1338                  */
1339                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1340                         goto new_sess_out;
1341         } else {
1342                 /*
1343                  * Add a new connection to an existing session.
1344                  * We check for a non-existant session in
1345                  * iscsi_login_non_zero_tsih_s2() below based
1346                  * on ISID/TSIH, but wait until after authentication
1347                  * to check for connection reinstatement, etc.
1348                  */
1349                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1350                         goto new_sess_out;
1351         }
1352         /*
1353          * SessionType: Discovery
1354          *
1355          *      Locates Default Portal
1356          *
1357          * SessionType: Normal
1358          *
1359          *      Locates Target Portal from NP -> Target IQN
1360          */
1361         rc = iscsi_target_locate_portal(np, conn, login);
1362         if (rc < 0) {
1363                 tpg = conn->tpg;
1364                 goto new_sess_out;
1365         }
1366         login->zero_tsih = zero_tsih;
1367
1368         conn->sess->se_sess->sup_prot_ops =
1369                 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1370
1371         tpg = conn->tpg;
1372         if (!tpg) {
1373                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1374                 goto new_sess_out;
1375         }
1376
1377         if (zero_tsih) {
1378                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1379                         goto new_sess_out;
1380         } else {
1381                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1382                         goto old_sess_out;
1383         }
1384
1385         ret = iscsi_target_start_negotiation(login, conn);
1386         if (ret < 0)
1387                 goto new_sess_out;
1388
1389         if (!conn->sess) {
1390                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1391                 goto new_sess_out;
1392         }
1393
1394         iscsi_stop_login_thread_timer(np);
1395
1396         if (signal_pending(current))
1397                 goto new_sess_out;
1398
1399         if (ret == 1) {
1400                 tpg_np = conn->tpg_np;
1401
1402                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1403                 if (ret < 0)
1404                         goto new_sess_out;
1405
1406                 iscsit_deaccess_np(np, tpg, tpg_np);
1407         }
1408
1409         tpg = NULL;
1410         tpg_np = NULL;
1411         /* Get another socket */
1412         return 1;
1413
1414 new_sess_out:
1415         new_sess = true;
1416 old_sess_out:
1417         tpg_np = conn->tpg_np;
1418         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1419         new_sess = false;
1420
1421         if (tpg) {
1422                 iscsit_deaccess_np(np, tpg, tpg_np);
1423                 tpg = NULL;
1424                 tpg_np = NULL;
1425         }
1426
1427 out:
1428         return 1;
1429
1430 exit:
1431         iscsi_stop_login_thread_timer(np);
1432         spin_lock_bh(&np->np_thread_lock);
1433         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1434         spin_unlock_bh(&np->np_thread_lock);
1435
1436         return 0;
1437 }
1438
1439 int iscsi_target_login_thread(void *arg)
1440 {
1441         struct iscsi_np *np = arg;
1442         int ret;
1443
1444         allow_signal(SIGINT);
1445
1446         while (1) {
1447                 ret = __iscsi_target_login_thread(np);
1448                 /*
1449                  * We break and exit here unless another sock_accept() call
1450                  * is expected.
1451                  */
1452                 if (ret != 1)
1453                         break;
1454         }
1455
1456         return 0;
1457 }