drivers/target/iscsi/iscsi_target_login.c

   1 /*******************************************************************************
   2  * This file contains the login functions used by the iSCSI Target driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/idr.h>
  23 #include <scsi/iscsi_proto.h>
  24 #include <target/target_core_base.h>
  25 #include <target/target_core_fabric.h>
  26
  27 #include "iscsi_target_core.h"
  28 #include "iscsi_target_tq.h"
  29 #include "iscsi_target_device.h"
  30 #include "iscsi_target_nego.h"
  31 #include "iscsi_target_erl0.h"
  32 #include "iscsi_target_erl2.h"
  33 #include "iscsi_target_login.h"
  34 #include "iscsi_target_stat.h"
  35 #include "iscsi_target_tpg.h"
  36 #include "iscsi_target_util.h"
  37 #include "iscsi_target.h"
  38 #include "iscsi_target_parameters.h"
  39
  40 #include <target/iscsi/iscsi_transport.h>
  41
  42 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  43 {
  44         struct iscsi_login *login;
  45
  46         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  47         if (!login) {
  48                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  49                 return NULL;
  50         }
  51         conn->login = login;
  52         login->conn = conn;
  53         login->first_request = 1;
  54
  55         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  56         if (!login->req_buf) {
  57                 pr_err("Unable to allocate memory for response buffer.\n");
  58                 goto out_login;
  59         }
  60
  61         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  62         if (!login->rsp_buf) {
  63                 pr_err("Unable to allocate memory for request buffer.\n");
  64                 goto out_req_buf;
  65         }
  66
  67         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  68         if (!conn->conn_ops) {
  69                 pr_err("Unable to allocate memory for"
  70                         " struct iscsi_conn_ops.\n");
  71                 goto out_rsp_buf;
  72         }
  73
  74         init_waitqueue_head(&conn->queues_wq);
  75         INIT_LIST_HEAD(&conn->conn_list);
  76         INIT_LIST_HEAD(&conn->conn_cmd_list);
  77         INIT_LIST_HEAD(&conn->immed_queue_list);
  78         INIT_LIST_HEAD(&conn->response_queue_list);
  79         init_completion(&conn->conn_post_wait_comp);
  80         init_completion(&conn->conn_wait_comp);
  81         init_completion(&conn->conn_wait_rcfr_comp);
  82         init_completion(&conn->conn_waiting_on_uc_comp);
  83         init_completion(&conn->conn_logout_comp);
  84         init_completion(&conn->rx_half_close_comp);
  85         init_completion(&conn->tx_half_close_comp);
  86         spin_lock_init(&conn->cmd_lock);
  87         spin_lock_init(&conn->conn_usage_lock);
  88         spin_lock_init(&conn->immed_queue_lock);
  89         spin_lock_init(&conn->nopin_timer_lock);
  90         spin_lock_init(&conn->response_queue_lock);
  91         spin_lock_init(&conn->state_lock);
  92
  93         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  94                 pr_err("Unable to allocate conn->conn_cpumask\n");
  95                 goto out_conn_ops;
  96         }
  97         conn->conn_login = login;
  98
  99         return login;
 100
 101 out_conn_ops:
 102         kfree(conn->conn_ops);
 103 out_rsp_buf:
 104         kfree(login->rsp_buf);
 105 out_req_buf:
 106         kfree(login->req_buf);
 107 out_login:
 108         kfree(login);
 109         return NULL;
 110 }
 111
 112 /*
 113  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 114  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 115  */
 116 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 117 {
 118         /*
 119          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 120          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 121          * to software 1x8 byte slicing from crc32c.ko
 122          */
 123         conn->conn_rx_hash.flags = 0;
 124         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 125                                                 CRYPTO_ALG_ASYNC);
 126         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 127                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 128                 return -ENOMEM;
 129         }
 130
 131         conn->conn_tx_hash.flags = 0;
 132         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 133                                                 CRYPTO_ALG_ASYNC);
 134         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 135                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 136                 crypto_free_hash(conn->conn_rx_hash.tfm);
 137                 return -ENOMEM;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int iscsi_login_check_initiator_version(
 144         struct iscsi_conn *conn,
 145         u8 version_max,
 146         u8 version_min)
 147 {
 148         if ((version_max != 0x00) || (version_min != 0x00)) {
 149                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 150                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 151                         version_min, version_max);
 152                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 153                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 154                 return -1;
 155         }
 156
 157         return 0;
 158 }
 159
 160 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 161 {
 162         int sessiontype;
 163         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 164         struct iscsi_portal_group *tpg = conn->tpg;
 165         struct iscsi_session *sess = NULL, *sess_p = NULL;
 166         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 167         struct se_session *se_sess, *se_sess_tmp;
 168
 169         initiatorname_param = iscsi_find_param_from_key(
 170                         INITIATORNAME, conn->param_list);
 171         sessiontype_param = iscsi_find_param_from_key(
 172                         SESSIONTYPE, conn->param_list);
 173         if (!initiatorname_param || !sessiontype_param) {
 174                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 175                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 176                 return -1;
 177         }
 178
 179         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 180
 181         spin_lock_bh(&se_tpg->session_lock);
 182         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 183                         sess_list) {
 184
 185                 sess_p = se_sess->fabric_sess_ptr;
 186                 spin_lock(&sess_p->conn_lock);
 187                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 188                     atomic_read(&sess_p->session_logout) ||
 189                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 190                         spin_unlock(&sess_p->conn_lock);
 191                         continue;
 192                 }
 193                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 194                    (!strcmp(sess_p->sess_ops->InitiatorName,
 195                             initiatorname_param->value) &&
 196                    (sess_p->sess_ops->SessionType == sessiontype))) {
 197                         atomic_set(&sess_p->session_reinstatement, 1);
 198                         spin_unlock(&sess_p->conn_lock);
 199                         iscsit_inc_session_usage_count(sess_p);
 200                         iscsit_stop_time2retain_timer(sess_p);
 201                         sess = sess_p;
 202                         break;
 203                 }
 204                 spin_unlock(&sess_p->conn_lock);
 205         }
 206         spin_unlock_bh(&se_tpg->session_lock);
 207         /*
 208          * If the Time2Retain handler has expired, the session is already gone.
 209          */
 210         if (!sess)
 211                 return 0;
 212
 213         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 214                 " preforming session reinstatement.\n", (sessiontype) ?
 215                 "Discovery" : "Normal", sess->sid,
 216                 sess->sess_ops->InitiatorName);
 217
 218         spin_lock_bh(&sess->conn_lock);
 219         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 220                 spin_unlock_bh(&sess->conn_lock);
 221                 iscsit_dec_session_usage_count(sess);
 222                 target_put_session(sess->se_sess);
 223                 return 0;
 224         }
 225         spin_unlock_bh(&sess->conn_lock);
 226
 227         iscsit_stop_session(sess, 1, 1);
 228         iscsit_dec_session_usage_count(sess);
 229
 230         target_put_session(sess->se_sess);
 231         return 0;
 232 }
 233
 234 static void iscsi_login_set_conn_values(
 235         struct iscsi_session *sess,
 236         struct iscsi_conn *conn,
 237         __be16 cid)
 238 {
 239         conn->sess              = sess;
 240         conn->cid               = be16_to_cpu(cid);
 241         /*
 242          * Generate a random Status sequence number (statsn) for the new
 243          * iSCSI connection.
 244          */
 245         get_random_bytes(&conn->stat_sn, sizeof(u32));
 246
 247         mutex_lock(&auth_id_lock);
 248         conn->auth_id           = iscsit_global->auth_id++;
 249         mutex_unlock(&auth_id_lock);
 250 }
 251
 252 /*
 253  *      This is the leading connection of a new session,
 254  *      or session reinstatement.
 255  */
 256 static int iscsi_login_zero_tsih_s1(
 257         struct iscsi_conn *conn,
 258         unsigned char *buf)
 259 {
 260         struct iscsi_session *sess = NULL;
 261         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 262         int ret;
 263
 264         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 265         if (!sess) {
 266                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 267                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 268                 pr_err("Could not allocate memory for session\n");
 269                 return -ENOMEM;
 270         }
 271
 272         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 273         sess->init_task_tag     = pdu->itt;
 274         memcpy(&sess->isid, pdu->isid, 6);
 275         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 276         INIT_LIST_HEAD(&sess->sess_conn_list);
 277         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 278         INIT_LIST_HEAD(&sess->cr_active_list);
 279         INIT_LIST_HEAD(&sess->cr_inactive_list);
 280         init_completion(&sess->async_msg_comp);
 281         init_completion(&sess->reinstatement_comp);
 282         init_completion(&sess->session_wait_comp);
 283         init_completion(&sess->session_waiting_on_uc_comp);
 284         mutex_init(&sess->cmdsn_mutex);
 285         spin_lock_init(&sess->conn_lock);
 286         spin_lock_init(&sess->cr_a_lock);
 287         spin_lock_init(&sess->cr_i_lock);
 288         spin_lock_init(&sess->session_usage_lock);
 289         spin_lock_init(&sess->ttt_lock);
 290
 291         idr_preload(GFP_KERNEL);
 292         spin_lock_bh(&sess_idr_lock);
 293         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 294         if (ret >= 0)
 295                 sess->session_index = ret;
 296         spin_unlock_bh(&sess_idr_lock);
 297         idr_preload_end();
 298
 299         if (ret < 0) {
 300                 pr_err("idr_alloc() for sess_idr failed\n");
 301                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 302                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 303                 kfree(sess);
 304                 return -ENOMEM;
 305         }
 306
 307         sess->creation_time = get_jiffies_64();
 308         /*
 309          * The FFP CmdSN window values will be allocated from the TPG's
 310          * Initiator Node's ACL once the login has been successfully completed.
 311          */
 312         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 313
 314         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 315         if (!sess->sess_ops) {
 316                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 317                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 318                 pr_err("Unable to allocate memory for"
 319                                 " struct iscsi_sess_ops.\n");
 320                 kfree(sess);
 321                 return -ENOMEM;
 322         }
 323
 324         sess->se_sess = transport_init_session();
 325         if (IS_ERR(sess->se_sess)) {
 326                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 327                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 328                 kfree(sess);
 329                 return -ENOMEM;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static int iscsi_login_zero_tsih_s2(
 336         struct iscsi_conn *conn)
 337 {
 338         struct iscsi_node_attrib *na;
 339         struct iscsi_session *sess = conn->sess;
 340         unsigned char buf[32];
 341         bool iser = false;
 342
 343         sess->tpg = conn->tpg;
 344
 345         /*
 346          * Assign a new TPG Session Handle.  Note this is protected with
 347          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 348          */
 349         sess->tsih = ++sess->tpg->ntsih;
 350         if (!sess->tsih)
 351                 sess->tsih = ++sess->tpg->ntsih;
 352
 353         /*
 354          * Create the default params from user defined values..
 355          */
 356         if (iscsi_copy_param_list(&conn->param_list,
 357                                 conn->tpg->param_list, 1) < 0) {
 358                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 359                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 360                 return -1;
 361         }
 362
 363         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 364                 iser = true;
 365
 366         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 367
 368         if (sess->sess_ops->SessionType)
 369                 return iscsi_set_keys_irrelevant_for_discovery(
 370                                 conn->param_list);
 371
 372         na = iscsit_tpg_get_node_attrib(sess);
 373
 374         /*
 375          * Need to send TargetPortalGroupTag back in first login response
 376          * on any iSCSI connection where the Initiator provides TargetName.
 377          * See 5.3.1.  Login Phase Start
 378          *
 379          * In our case, we have already located the struct iscsi_tiqn at this point.
 380          */
 381         memset(buf, 0, 32);
 382         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 383         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 384                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 385                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 386                 return -1;
 387         }
 388
 389         /*
 390          * Workaround for Initiators that have broken connection recovery logic.
 391          *
 392          * "We would really like to get rid of this." Linux-iSCSI.org team
 393          */
 394         memset(buf, 0, 32);
 395         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 396         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 397                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 398                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 399                 return -1;
 400         }
 401
 402         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 403                 return -1;
 404         /*
 405          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 406          */
 407         if (iser) {
 408                 struct iscsi_param *param;
 409                 unsigned long mrdsl, off;
 410                 int rc;
 411
 412                 sprintf(buf, "RDMAExtensions=Yes");
 413                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 414                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 415                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 416                         return -1;
 417                 }
 418                 /*
 419                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 420                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 421                  */
 422                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 423                                                   conn->param_list);
 424                 if (!param) {
 425                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 426                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 427                         return -1;
 428                 }
 429                 rc = kstrtoul(param->value, 0, &mrdsl);
 430                 if (rc < 0) {
 431                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 432                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 433                         return -1;
 434                 }
 435                 off = mrdsl % PAGE_SIZE;
 436                 if (!off)
 437                         return 0;
 438
 439                 if (mrdsl < PAGE_SIZE)
 440                         mrdsl = PAGE_SIZE;
 441                 else
 442                         mrdsl -= off;
 443
 444                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 445                         " to PAGE_SIZE\n", mrdsl);
 446
 447                 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
 448                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 449                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 450                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 451                         return -1;
 452                 }
 453         }
 454
 455         return 0;
 456 }
 457
 458 /*
 459  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 460  * The Initiator node will be able to enable FIM by proposing them itself.
 461  */
 462 int iscsi_login_disable_FIM_keys(
 463         struct iscsi_param_list *param_list,
 464         struct iscsi_conn *conn)
 465 {
 466         struct iscsi_param *param;
 467
 468         param = iscsi_find_param_from_key("OFMarker", param_list);
 469         if (!param) {
 470                 pr_err("iscsi_find_param_from_key() for"
 471                                 " OFMarker failed\n");
 472                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 473                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 474                 return -1;
 475         }
 476         param->state &= ~PSTATE_NEGOTIATE;
 477
 478         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 479         if (!param) {
 480                 pr_err("iscsi_find_param_from_key() for"
 481                                 " IFMarker failed\n");
 482                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 483                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 484                 return -1;
 485         }
 486         param->state &= ~PSTATE_NEGOTIATE;
 487
 488         param = iscsi_find_param_from_key("IFMarker", param_list);
 489         if (!param) {
 490                 pr_err("iscsi_find_param_from_key() for"
 491                                 " IFMarker failed\n");
 492                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 493                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 494                 return -1;
 495         }
 496         param->state &= ~PSTATE_NEGOTIATE;
 497
 498         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 499         if (!param) {
 500                 pr_err("iscsi_find_param_from_key() for"
 501                                 " IFMarker failed\n");
 502                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 503                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 504                 return -1;
 505         }
 506         param->state &= ~PSTATE_NEGOTIATE;
 507
 508         return 0;
 509 }
 510
 511 static int iscsi_login_non_zero_tsih_s1(
 512         struct iscsi_conn *conn,
 513         unsigned char *buf)
 514 {
 515         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 516
 517         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 518         return 0;
 519 }
 520
 521 /*
 522  *      Add a new connection to an existing session.
 523  */
 524 static int iscsi_login_non_zero_tsih_s2(
 525         struct iscsi_conn *conn,
 526         unsigned char *buf)
 527 {
 528         struct iscsi_portal_group *tpg = conn->tpg;
 529         struct iscsi_session *sess = NULL, *sess_p = NULL;
 530         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 531         struct se_session *se_sess, *se_sess_tmp;
 532         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 533         bool iser = false;
 534
 535         spin_lock_bh(&se_tpg->session_lock);
 536         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 537                         sess_list) {
 538
 539                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 540                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 541                     atomic_read(&sess_p->session_logout) ||
 542                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 543                         continue;
 544                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 545                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 546                         iscsit_inc_session_usage_count(sess_p);
 547                         iscsit_stop_time2retain_timer(sess_p);
 548                         sess = sess_p;
 549                         break;
 550                 }
 551         }
 552         spin_unlock_bh(&se_tpg->session_lock);
 553
 554         /*
 555          * If the Time2Retain handler has expired, the session is already gone.
 556          */
 557         if (!sess) {
 558                 pr_err("Initiator attempting to add a connection to"
 559                         " a non-existent session, rejecting iSCSI Login.\n");
 560                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 561                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 562                 return -1;
 563         }
 564
 565         /*
 566          * Stop the Time2Retain timer if this is a failed session, we restart
 567          * the timer if the login is not successful.
 568          */
 569         spin_lock_bh(&sess->conn_lock);
 570         if (sess->session_state == TARG_SESS_STATE_FAILED)
 571                 atomic_set(&sess->session_continuation, 1);
 572         spin_unlock_bh(&sess->conn_lock);
 573
 574         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 575
 576         if (iscsi_copy_param_list(&conn->param_list,
 577                         conn->tpg->param_list, 0) < 0) {
 578                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 579                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 580                 return -1;
 581         }
 582
 583         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 584                 iser = true;
 585
 586         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 587         /*
 588          * Need to send TargetPortalGroupTag back in first login response
 589          * on any iSCSI connection where the Initiator provides TargetName.
 590          * See 5.3.1.  Login Phase Start
 591          *
 592          * In our case, we have already located the struct iscsi_tiqn at this point.
 593          */
 594         memset(buf, 0, 32);
 595         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 596         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 597                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 598                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 599                 return -1;
 600         }
 601
 602         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 603 }
 604
 605 int iscsi_login_post_auth_non_zero_tsih(
 606         struct iscsi_conn *conn,
 607         u16 cid,
 608         u32 exp_statsn)
 609 {
 610         struct iscsi_conn *conn_ptr = NULL;
 611         struct iscsi_conn_recovery *cr = NULL;
 612         struct iscsi_session *sess = conn->sess;
 613
 614         /*
 615          * By following item 5 in the login table,  if we have found
 616          * an existing ISID and a valid/existing TSIH and an existing
 617          * CID we do connection reinstatement.  Currently we dont not
 618          * support it so we send back an non-zero status class to the
 619          * initiator and release the new connection.
 620          */
 621         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 622         if (conn_ptr) {
 623                 pr_err("Connection exists with CID %hu for %s,"
 624                         " performing connection reinstatement.\n",
 625                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 626
 627                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 628                 iscsit_dec_conn_usage_count(conn_ptr);
 629         }
 630
 631         /*
 632          * Check for any connection recovery entires containing CID.
 633          * We use the original ExpStatSN sent in the first login request
 634          * to acknowledge commands for the failed connection.
 635          *
 636          * Also note that an explict logout may have already been sent,
 637          * but the response may not be sent due to additional connection
 638          * loss.
 639          */
 640         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 641                 cr = iscsit_get_inactive_connection_recovery_entry(
 642                                 sess, cid);
 643                 if (cr) {
 644                         pr_debug("Performing implicit logout"
 645                                 " for connection recovery on CID: %hu\n",
 646                                         conn->cid);
 647                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 648                 }
 649         }
 650
 651         /*
 652          * Else we follow item 4 from the login table in that we have
 653          * found an existing ISID and a valid/existing TSIH and a new
 654          * CID we go ahead and continue to add a new connection to the
 655          * session.
 656          */
 657         pr_debug("Adding CID %hu to existing session for %s.\n",
 658                         cid, sess->sess_ops->InitiatorName);
 659
 660         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 661                 pr_err("Adding additional connection to this session"
 662                         " would exceed MaxConnections %d, login failed.\n",
 663                                 sess->sess_ops->MaxConnections);
 664                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 665                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 666                 return -1;
 667         }
 668
 669         return 0;
 670 }
 671
 672 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 673 {
 674         struct iscsi_session *sess = conn->sess;
 675         /*
 676          * FIXME: Unsolicitied NopIN support for ISER
 677          */
 678         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 679                 return;
 680
 681         if (!sess->sess_ops->SessionType)
 682                 iscsit_start_nopin_timer(conn);
 683 }
 684
 685 int iscsi_post_login_handler(
 686         struct iscsi_np *np,
 687         struct iscsi_conn *conn,
 688         u8 zero_tsih)
 689 {
 690         int stop_timer = 0;
 691         struct iscsi_session *sess = conn->sess;
 692         struct se_session *se_sess = sess->se_sess;
 693         struct iscsi_portal_group *tpg = sess->tpg;
 694         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 695         struct iscsi_thread_set *ts;
 696
 697         iscsit_inc_conn_usage_count(conn);
 698
 699         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 700                         ISCSI_LOGIN_STATUS_ACCEPT);
 701
 702         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 703         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 704
 705         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 706         iscsit_set_sync_and_steering_values(conn);
 707         /*
 708          * SCSI Initiator -> SCSI Target Port Mapping
 709          */
 710         ts = iscsi_get_thread_set();
 711         if (!zero_tsih) {
 712                 iscsi_set_session_parameters(sess->sess_ops,
 713                                 conn->param_list, 0);
 714                 iscsi_release_param_list(conn->param_list);
 715                 conn->param_list = NULL;
 716
 717                 spin_lock_bh(&sess->conn_lock);
 718                 atomic_set(&sess->session_continuation, 0);
 719                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 720                         pr_debug("Moving to"
 721                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 722                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 723                         stop_timer = 1;
 724                 }
 725
 726                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 727                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 728                         conn->local_ip, conn->local_port, tpg->tpgt);
 729
 730                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 731                 atomic_inc(&sess->nconn);
 732                 pr_debug("Incremented iSCSI Connection count to %hu"
 733                         " from node: %s\n", atomic_read(&sess->nconn),
 734                         sess->sess_ops->InitiatorName);
 735                 spin_unlock_bh(&sess->conn_lock);
 736
 737                 iscsi_post_login_start_timers(conn);
 738
 739                 iscsi_activate_thread_set(conn, ts);
 740                 /*
 741                  * Determine CPU mask to ensure connection's RX and TX kthreads
 742                  * are scheduled on the same CPU.
 743                  */
 744                 iscsit_thread_get_cpumask(conn);
 745                 conn->conn_rx_reset_cpumask = 1;
 746                 conn->conn_tx_reset_cpumask = 1;
 747
 748                 iscsit_dec_conn_usage_count(conn);
 749                 if (stop_timer) {
 750                         spin_lock_bh(&se_tpg->session_lock);
 751                         iscsit_stop_time2retain_timer(sess);
 752                         spin_unlock_bh(&se_tpg->session_lock);
 753                 }
 754                 iscsit_dec_session_usage_count(sess);
 755                 return 0;
 756         }
 757
 758         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 759         iscsi_release_param_list(conn->param_list);
 760         conn->param_list = NULL;
 761
 762         iscsit_determine_maxcmdsn(sess);
 763
 764         spin_lock_bh(&se_tpg->session_lock);
 765         __transport_register_session(&sess->tpg->tpg_se_tpg,
 766                         se_sess->se_node_acl, se_sess, sess);
 767         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 768         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 769
 770         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 771                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 772                 tpg->tpgt);
 773
 774         spin_lock_bh(&sess->conn_lock);
 775         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 776         atomic_inc(&sess->nconn);
 777         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 778                 " %s\n", atomic_read(&sess->nconn),
 779                 sess->sess_ops->InitiatorName);
 780         spin_unlock_bh(&sess->conn_lock);
 781
 782         sess->sid = tpg->sid++;
 783         if (!sess->sid)
 784                 sess->sid = tpg->sid++;
 785         pr_debug("Established iSCSI session from node: %s\n",
 786                         sess->sess_ops->InitiatorName);
 787
 788         tpg->nsessions++;
 789         if (tpg->tpg_tiqn)
 790                 tpg->tpg_tiqn->tiqn_nsessions++;
 791
 792         pr_debug("Incremented number of active iSCSI sessions to %u on"
 793                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 794         spin_unlock_bh(&se_tpg->session_lock);
 795
 796         iscsi_post_login_start_timers(conn);
 797         iscsi_activate_thread_set(conn, ts);
 798         /*
 799          * Determine CPU mask to ensure connection's RX and TX kthreads
 800          * are scheduled on the same CPU.
 801          */
 802         iscsit_thread_get_cpumask(conn);
 803         conn->conn_rx_reset_cpumask = 1;
 804         conn->conn_tx_reset_cpumask = 1;
 805
 806         iscsit_dec_conn_usage_count(conn);
 807
 808         return 0;
 809 }
 810
 811 static void iscsi_handle_login_thread_timeout(unsigned long data)
 812 {
 813         struct iscsi_np *np = (struct iscsi_np *) data;
 814
 815         spin_lock_bh(&np->np_thread_lock);
 816         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 817                         np->np_ip, np->np_port);
 818
 819         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 820                 spin_unlock_bh(&np->np_thread_lock);
 821                 return;
 822         }
 823
 824         if (np->np_thread)
 825                 send_sig(SIGINT, np->np_thread, 1);
 826
 827         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 828         spin_unlock_bh(&np->np_thread_lock);
 829 }
 830
 831 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 832 {
 833         /*
 834          * This used the TA_LOGIN_TIMEOUT constant because at this
 835          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 836          */
 837         spin_lock_bh(&np->np_thread_lock);
 838         init_timer(&np->np_login_timer);
 839         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 840         np->np_login_timer.data = (unsigned long)np;
 841         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 842         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 843         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 844         add_timer(&np->np_login_timer);
 845
 846         pr_debug("Added timeout timer to iSCSI login request for"
 847                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 848         spin_unlock_bh(&np->np_thread_lock);
 849 }
 850
 851 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 852 {
 853         spin_lock_bh(&np->np_thread_lock);
 854         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 855                 spin_unlock_bh(&np->np_thread_lock);
 856                 return;
 857         }
 858         np->np_login_timer_flags |= ISCSI_TF_STOP;
 859         spin_unlock_bh(&np->np_thread_lock);
 860
 861         del_timer_sync(&np->np_login_timer);
 862
 863         spin_lock_bh(&np->np_thread_lock);
 864         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 865         spin_unlock_bh(&np->np_thread_lock);
 866 }
 867
 868 int iscsit_setup_np(
 869         struct iscsi_np *np,
 870         struct __kernel_sockaddr_storage *sockaddr)
 871 {
 872         struct socket *sock = NULL;
 873         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 874
 875         switch (np->np_network_transport) {
 876         case ISCSI_TCP:
 877                 np->np_ip_proto = IPPROTO_TCP;
 878                 np->np_sock_type = SOCK_STREAM;
 879                 break;
 880         case ISCSI_SCTP_TCP:
 881                 np->np_ip_proto = IPPROTO_SCTP;
 882                 np->np_sock_type = SOCK_STREAM;
 883                 break;
 884         case ISCSI_SCTP_UDP:
 885                 np->np_ip_proto = IPPROTO_SCTP;
 886                 np->np_sock_type = SOCK_SEQPACKET;
 887                 break;
 888         default:
 889                 pr_err("Unsupported network_transport: %d\n",
 890                                 np->np_network_transport);
 891                 return -EINVAL;
 892         }
 893
 894         np->np_ip_proto = IPPROTO_TCP;
 895         np->np_sock_type = SOCK_STREAM;
 896
 897         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 898                         np->np_ip_proto, &sock);
 899         if (ret < 0) {
 900                 pr_err("sock_create() failed.\n");
 901                 return ret;
 902         }
 903         np->np_socket = sock;
 904         /*
 905          * Setup the np->np_sockaddr from the passed sockaddr setup
 906          * in iscsi_target_configfs.c code..
 907          */
 908         memcpy(&np->np_sockaddr, sockaddr,
 909                         sizeof(struct __kernel_sockaddr_storage));
 910
 911         if (sockaddr->ss_family == AF_INET6)
 912                 len = sizeof(struct sockaddr_in6);
 913         else
 914                 len = sizeof(struct sockaddr_in);
 915         /*
 916          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 917          */
 918         /* FIXME: Someone please explain why this is endian-safe */
 919         opt = 1;
 920         if (np->np_network_transport == ISCSI_TCP) {
 921                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 922                                 (char *)&opt, sizeof(opt));
 923                 if (ret < 0) {
 924                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 925                                 " failed: %d\n", ret);
 926                         goto fail;
 927                 }
 928         }
 929
 930         /* FIXME: Someone please explain why this is endian-safe */
 931         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 932                         (char *)&opt, sizeof(opt));
 933         if (ret < 0) {
 934                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 935                         " failed\n");
 936                 goto fail;
 937         }
 938
 939         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 940                         (char *)&opt, sizeof(opt));
 941         if (ret < 0) {
 942                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 943                         " failed\n");
 944                 goto fail;
 945         }
 946
 947         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 948         if (ret < 0) {
 949                 pr_err("kernel_bind() failed: %d\n", ret);
 950                 goto fail;
 951         }
 952
 953         ret = kernel_listen(sock, backlog);
 954         if (ret != 0) {
 955                 pr_err("kernel_listen() failed: %d\n", ret);
 956                 goto fail;
 957         }
 958
 959         return 0;
 960 fail:
 961         np->np_socket = NULL;
 962         if (sock)
 963                 sock_release(sock);
 964         return ret;
 965 }
 966
 967 int iscsi_target_setup_login_socket(
 968         struct iscsi_np *np,
 969         struct __kernel_sockaddr_storage *sockaddr)
 970 {
 971         struct iscsit_transport *t;
 972         int rc;
 973
 974         t = iscsit_get_transport(np->np_network_transport);
 975         if (!t)
 976                 return -EINVAL;
 977
 978         rc = t->iscsit_setup_np(np, sockaddr);
 979         if (rc < 0) {
 980                 iscsit_put_transport(t);
 981                 return rc;
 982         }
 983
 984         np->np_transport = t;
 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, stop;
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 {
1214                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1215         }
1216         spin_unlock_bh(&np->np_thread_lock);
1217
1218         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1219         if (!conn) {
1220                 pr_err("Could not allocate memory for"
1221                         " new connection\n");
1222                 /* Get another socket */
1223                 return 1;
1224         }
1225         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1226         conn->conn_state = TARG_CONN_STATE_FREE;
1227
1228         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1229                 kfree(conn);
1230                 return 1;
1231         }
1232
1233         rc = np->np_transport->iscsit_accept_np(np, conn);
1234         if (rc == -ENOSYS) {
1235                 complete(&np->np_restart_comp);
1236                 iscsit_put_transport(conn->conn_transport);
1237                 kfree(conn);
1238                 conn = NULL;
1239                 goto exit;
1240         } else if (rc < 0) {
1241                 spin_lock_bh(&np->np_thread_lock);
1242                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1243                         spin_unlock_bh(&np->np_thread_lock);
1244                         complete(&np->np_restart_comp);
1245                         iscsit_put_transport(conn->conn_transport);
1246                         kfree(conn);
1247                         conn = NULL;
1248                         if (ret == -ENODEV)
1249                                 goto out;
1250                         /* Get another socket */
1251                         return 1;
1252                 }
1253                 spin_unlock_bh(&np->np_thread_lock);
1254                 iscsit_put_transport(conn->conn_transport);
1255                 kfree(conn);
1256                 conn = NULL;
1257                 goto out;
1258         }
1259         /*
1260          * Perform the remaining iSCSI connection initialization items..
1261          */
1262         login = iscsi_login_init_conn(conn);
1263         if (!login) {
1264                 goto new_sess_out;
1265         }
1266
1267         iscsi_start_login_thread_timer(np);
1268
1269         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1270         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1271         /*
1272          * This will process the first login request + payload..
1273          */
1274         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1275         if (rc == 1)
1276                 return 1;
1277         else if (rc < 0)
1278                 goto new_sess_out;
1279
1280         buffer = &login->req[0];
1281         pdu = (struct iscsi_login_req *)buffer;
1282         /*
1283          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1284          * when Status-Class != 0.
1285         */
1286         conn->login_itt = pdu->itt;
1287
1288         spin_lock_bh(&np->np_thread_lock);
1289         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1290                 spin_unlock_bh(&np->np_thread_lock);
1291                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1292                         " active.\n", np->np_ip, np->np_port);
1293                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1294                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1295                 goto new_sess_out;
1296         }
1297         spin_unlock_bh(&np->np_thread_lock);
1298
1299         conn->network_transport = np->np_network_transport;
1300
1301         pr_debug("Received iSCSI login request from %s on %s Network"
1302                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1303                 conn->local_ip, conn->local_port);
1304
1305         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1306         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1307
1308         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1309                         pdu->min_version) < 0)
1310                 goto new_sess_out;
1311
1312         zero_tsih = (pdu->tsih == 0x0000);
1313         if (zero_tsih) {
1314                 /*
1315                  * This is the leading connection of a new session.
1316                  * We wait until after authentication to check for
1317                  * session reinstatement.
1318                  */
1319                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1320                         goto new_sess_out;
1321         } else {
1322                 /*
1323                  * Add a new connection to an existing session.
1324                  * We check for a non-existant session in
1325                  * iscsi_login_non_zero_tsih_s2() below based
1326                  * on ISID/TSIH, but wait until after authentication
1327                  * to check for connection reinstatement, etc.
1328                  */
1329                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1330                         goto new_sess_out;
1331         }
1332         /*
1333          * SessionType: Discovery
1334          *
1335          *      Locates Default Portal
1336          *
1337          * SessionType: Normal
1338          *
1339          *      Locates Target Portal from NP -> Target IQN
1340          */
1341         rc = iscsi_target_locate_portal(np, conn, login);
1342         if (rc < 0) {
1343                 tpg = conn->tpg;
1344                 goto new_sess_out;
1345         }
1346         login->zero_tsih = zero_tsih;
1347
1348         tpg = conn->tpg;
1349         if (!tpg) {
1350                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1351                 goto new_sess_out;
1352         }
1353
1354         if (zero_tsih) {
1355                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1356                         goto new_sess_out;
1357         } else {
1358                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1359                         goto old_sess_out;
1360         }
1361
1362         ret = iscsi_target_start_negotiation(login, conn);
1363         if (ret < 0)
1364                 goto new_sess_out;
1365
1366         if (!conn->sess) {
1367                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1368                 goto new_sess_out;
1369         }
1370
1371         iscsi_stop_login_thread_timer(np);
1372
1373         if (signal_pending(current))
1374                 goto new_sess_out;
1375
1376         if (ret == 1) {
1377                 tpg_np = conn->tpg_np;
1378
1379                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1380                 if (ret < 0)
1381                         goto new_sess_out;
1382
1383                 iscsit_deaccess_np(np, tpg, tpg_np);
1384         }
1385
1386         tpg = NULL;
1387         tpg_np = NULL;
1388         /* Get another socket */
1389         return 1;
1390
1391 new_sess_out:
1392         new_sess = true;
1393 old_sess_out:
1394         tpg_np = conn->tpg_np;
1395         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1396         new_sess = false;
1397
1398         if (tpg) {
1399                 iscsit_deaccess_np(np, tpg, tpg_np);
1400                 tpg = NULL;
1401                 tpg_np = NULL;
1402         }
1403
1404 out:
1405         stop = kthread_should_stop();
1406         if (!stop && signal_pending(current)) {
1407                 spin_lock_bh(&np->np_thread_lock);
1408                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1409                 spin_unlock_bh(&np->np_thread_lock);
1410         }
1411         /* Wait for another socket.. */
1412         if (!stop)
1413                 return 1;
1414 exit:
1415         iscsi_stop_login_thread_timer(np);
1416         spin_lock_bh(&np->np_thread_lock);
1417         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1418         np->np_thread = NULL;
1419         spin_unlock_bh(&np->np_thread_lock);
1420
1421         return 0;
1422 }
1423
1424 int iscsi_target_login_thread(void *arg)
1425 {
1426         struct iscsi_np *np = arg;
1427         int ret;
1428
1429         allow_signal(SIGINT);
1430
1431         while (!kthread_should_stop()) {
1432                 ret = __iscsi_target_login_thread(np);
1433                 /*
1434                  * We break and exit here unless another sock_accept() call
1435                  * is expected.
1436                  */
1437                 if (ret != 1)
1438                         break;
1439         }
1440
1441         return 0;
1442 }