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         enum target_prot_op sup_pro_ops;
 285         int ret;
 286
 287         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 288         if (!sess) {
 289                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 290                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 291                 pr_err("Could not allocate memory for session\n");
 292                 return -ENOMEM;
 293         }
 294
 295         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 296         sess->init_task_tag     = pdu->itt;
 297         memcpy(&sess->isid, pdu->isid, 6);
 298         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 299         INIT_LIST_HEAD(&sess->sess_conn_list);
 300         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 301         INIT_LIST_HEAD(&sess->cr_active_list);
 302         INIT_LIST_HEAD(&sess->cr_inactive_list);
 303         init_completion(&sess->async_msg_comp);
 304         init_completion(&sess->reinstatement_comp);
 305         init_completion(&sess->session_wait_comp);
 306         init_completion(&sess->session_waiting_on_uc_comp);
 307         mutex_init(&sess->cmdsn_mutex);
 308         spin_lock_init(&sess->conn_lock);
 309         spin_lock_init(&sess->cr_a_lock);
 310         spin_lock_init(&sess->cr_i_lock);
 311         spin_lock_init(&sess->session_usage_lock);
 312         spin_lock_init(&sess->ttt_lock);
 313
 314         idr_preload(GFP_KERNEL);
 315         spin_lock_bh(&sess_idr_lock);
 316         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 317         if (ret >= 0)
 318                 sess->session_index = ret;
 319         spin_unlock_bh(&sess_idr_lock);
 320         idr_preload_end();
 321
 322         if (ret < 0) {
 323                 pr_err("idr_alloc() for sess_idr failed\n");
 324                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 325                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 326                 kfree(sess);
 327                 return -ENOMEM;
 328         }
 329
 330         sess->creation_time = get_jiffies_64();
 331         /*
 332          * The FFP CmdSN window values will be allocated from the TPG's
 333          * Initiator Node's ACL once the login has been successfully completed.
 334          */
 335         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 336
 337         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 338         if (!sess->sess_ops) {
 339                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 340                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 341                 pr_err("Unable to allocate memory for"
 342                                 " struct iscsi_sess_ops.\n");
 343                 kfree(sess);
 344                 return -ENOMEM;
 345         }
 346         sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
 347
 348         sess->se_sess = transport_init_session(sup_pro_ops);
 349         if (IS_ERR(sess->se_sess)) {
 350                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 351                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 352                 kfree(sess);
 353                 return -ENOMEM;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int iscsi_login_zero_tsih_s2(
 360         struct iscsi_conn *conn)
 361 {
 362         struct iscsi_node_attrib *na;
 363         struct iscsi_session *sess = conn->sess;
 364         bool iser = false;
 365
 366         sess->tpg = conn->tpg;
 367
 368         /*
 369          * Assign a new TPG Session Handle.  Note this is protected with
 370          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 371          */
 372         sess->tsih = ++sess->tpg->ntsih;
 373         if (!sess->tsih)
 374                 sess->tsih = ++sess->tpg->ntsih;
 375
 376         /*
 377          * Create the default params from user defined values..
 378          */
 379         if (iscsi_copy_param_list(&conn->param_list,
 380                                 conn->tpg->param_list, 1) < 0) {
 381                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 382                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 383                 return -1;
 384         }
 385
 386         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 387                 iser = true;
 388
 389         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 390
 391         if (sess->sess_ops->SessionType)
 392                 return iscsi_set_keys_irrelevant_for_discovery(
 393                                 conn->param_list);
 394
 395         na = iscsit_tpg_get_node_attrib(sess);
 396
 397         /*
 398          * Need to send TargetPortalGroupTag back in first login response
 399          * on any iSCSI connection where the Initiator provides TargetName.
 400          * See 5.3.1.  Login Phase Start
 401          *
 402          * In our case, we have already located the struct iscsi_tiqn at this point.
 403          */
 404         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 405                 return -1;
 406
 407         /*
 408          * Workaround for Initiators that have broken connection recovery logic.
 409          *
 410          * "We would really like to get rid of this." Linux-iSCSI.org team
 411          */
 412         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 413                 return -1;
 414
 415         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 416                 return -1;
 417         /*
 418          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 419          */
 420         if (iser) {
 421                 struct iscsi_param *param;
 422                 unsigned long mrdsl, off;
 423                 int rc;
 424
 425                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 426                         return -1;
 427
 428                 /*
 429                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 430                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 431                  */
 432                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 433                                                   conn->param_list);
 434                 if (!param) {
 435                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 436                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 437                         return -1;
 438                 }
 439                 rc = kstrtoul(param->value, 0, &mrdsl);
 440                 if (rc < 0) {
 441                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 442                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 443                         return -1;
 444                 }
 445                 off = mrdsl % PAGE_SIZE;
 446                 if (!off)
 447                         goto check_prot;
 448
 449                 if (mrdsl < PAGE_SIZE)
 450                         mrdsl = PAGE_SIZE;
 451                 else
 452                         mrdsl -= off;
 453
 454                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 455                         " to PAGE_SIZE\n", mrdsl);
 456
 457                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 458                         return -1;
 459                 /*
 460                  * ISER currently requires that ImmediateData + Unsolicited
 461                  * Data be disabled when protection / signature MRs are enabled.
 462                  */
 463 check_prot:
 464                 if (sess->se_sess->sup_prot_ops &
 465                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 466                     TARGET_PROT_DOUT_INSERT)) {
 467
 468                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 469                                 return -1;
 470
 471                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 472                                 return -1;
 473
 474                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 475                                  " T10-PI enabled ISER session\n");
 476                 }
 477         }
 478
 479         return 0;
 480 }
 481
 482 /*
 483  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 484  * The Initiator node will be able to enable FIM by proposing them itself.
 485  */
 486 int iscsi_login_disable_FIM_keys(
 487         struct iscsi_param_list *param_list,
 488         struct iscsi_conn *conn)
 489 {
 490         struct iscsi_param *param;
 491
 492         param = iscsi_find_param_from_key("OFMarker", param_list);
 493         if (!param) {
 494                 pr_err("iscsi_find_param_from_key() for"
 495                                 " OFMarker failed\n");
 496                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 497                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 498                 return -1;
 499         }
 500         param->state &= ~PSTATE_NEGOTIATE;
 501
 502         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 503         if (!param) {
 504                 pr_err("iscsi_find_param_from_key() for"
 505                                 " IFMarker failed\n");
 506                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 507                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 508                 return -1;
 509         }
 510         param->state &= ~PSTATE_NEGOTIATE;
 511
 512         param = iscsi_find_param_from_key("IFMarker", param_list);
 513         if (!param) {
 514                 pr_err("iscsi_find_param_from_key() for"
 515                                 " IFMarker failed\n");
 516                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 517                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 518                 return -1;
 519         }
 520         param->state &= ~PSTATE_NEGOTIATE;
 521
 522         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 523         if (!param) {
 524                 pr_err("iscsi_find_param_from_key() for"
 525                                 " IFMarker failed\n");
 526                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 527                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 528                 return -1;
 529         }
 530         param->state &= ~PSTATE_NEGOTIATE;
 531
 532         return 0;
 533 }
 534
 535 static int iscsi_login_non_zero_tsih_s1(
 536         struct iscsi_conn *conn,
 537         unsigned char *buf)
 538 {
 539         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 540
 541         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 542         return 0;
 543 }
 544
 545 /*
 546  *      Add a new connection to an existing session.
 547  */
 548 static int iscsi_login_non_zero_tsih_s2(
 549         struct iscsi_conn *conn,
 550         unsigned char *buf)
 551 {
 552         struct iscsi_portal_group *tpg = conn->tpg;
 553         struct iscsi_session *sess = NULL, *sess_p = NULL;
 554         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 555         struct se_session *se_sess, *se_sess_tmp;
 556         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 557         bool iser = false;
 558
 559         spin_lock_bh(&se_tpg->session_lock);
 560         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 561                         sess_list) {
 562
 563                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 564                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 565                     atomic_read(&sess_p->session_logout) ||
 566                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 567                         continue;
 568                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 569                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 570                         iscsit_inc_session_usage_count(sess_p);
 571                         iscsit_stop_time2retain_timer(sess_p);
 572                         sess = sess_p;
 573                         break;
 574                 }
 575         }
 576         spin_unlock_bh(&se_tpg->session_lock);
 577
 578         /*
 579          * If the Time2Retain handler has expired, the session is already gone.
 580          */
 581         if (!sess) {
 582                 pr_err("Initiator attempting to add a connection to"
 583                         " a non-existent session, rejecting iSCSI Login.\n");
 584                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 585                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 586                 return -1;
 587         }
 588
 589         /*
 590          * Stop the Time2Retain timer if this is a failed session, we restart
 591          * the timer if the login is not successful.
 592          */
 593         spin_lock_bh(&sess->conn_lock);
 594         if (sess->session_state == TARG_SESS_STATE_FAILED)
 595                 atomic_set(&sess->session_continuation, 1);
 596         spin_unlock_bh(&sess->conn_lock);
 597
 598         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 599
 600         if (iscsi_copy_param_list(&conn->param_list,
 601                         conn->tpg->param_list, 0) < 0) {
 602                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 603                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 604                 return -1;
 605         }
 606
 607         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 608                 iser = true;
 609
 610         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 611         /*
 612          * Need to send TargetPortalGroupTag back in first login response
 613          * on any iSCSI connection where the Initiator provides TargetName.
 614          * See 5.3.1.  Login Phase Start
 615          *
 616          * In our case, we have already located the struct iscsi_tiqn at this point.
 617          */
 618         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 619                 return -1;
 620
 621         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 622 }
 623
 624 int iscsi_login_post_auth_non_zero_tsih(
 625         struct iscsi_conn *conn,
 626         u16 cid,
 627         u32 exp_statsn)
 628 {
 629         struct iscsi_conn *conn_ptr = NULL;
 630         struct iscsi_conn_recovery *cr = NULL;
 631         struct iscsi_session *sess = conn->sess;
 632
 633         /*
 634          * By following item 5 in the login table,  if we have found
 635          * an existing ISID and a valid/existing TSIH and an existing
 636          * CID we do connection reinstatement.  Currently we dont not
 637          * support it so we send back an non-zero status class to the
 638          * initiator and release the new connection.
 639          */
 640         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 641         if (conn_ptr) {
 642                 pr_err("Connection exists with CID %hu for %s,"
 643                         " performing connection reinstatement.\n",
 644                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 645
 646                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 647                 iscsit_dec_conn_usage_count(conn_ptr);
 648         }
 649
 650         /*
 651          * Check for any connection recovery entires containing CID.
 652          * We use the original ExpStatSN sent in the first login request
 653          * to acknowledge commands for the failed connection.
 654          *
 655          * Also note that an explict logout may have already been sent,
 656          * but the response may not be sent due to additional connection
 657          * loss.
 658          */
 659         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 660                 cr = iscsit_get_inactive_connection_recovery_entry(
 661                                 sess, cid);
 662                 if (cr) {
 663                         pr_debug("Performing implicit logout"
 664                                 " for connection recovery on CID: %hu\n",
 665                                         conn->cid);
 666                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 667                 }
 668         }
 669
 670         /*
 671          * Else we follow item 4 from the login table in that we have
 672          * found an existing ISID and a valid/existing TSIH and a new
 673          * CID we go ahead and continue to add a new connection to the
 674          * session.
 675          */
 676         pr_debug("Adding CID %hu to existing session for %s.\n",
 677                         cid, sess->sess_ops->InitiatorName);
 678
 679         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 680                 pr_err("Adding additional connection to this session"
 681                         " would exceed MaxConnections %d, login failed.\n",
 682                                 sess->sess_ops->MaxConnections);
 683                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 684                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 685                 return -1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 692 {
 693         struct iscsi_session *sess = conn->sess;
 694         /*
 695          * FIXME: Unsolicitied NopIN support for ISER
 696          */
 697         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 698                 return;
 699
 700         if (!sess->sess_ops->SessionType)
 701                 iscsit_start_nopin_timer(conn);
 702 }
 703
 704 int iscsi_post_login_handler(
 705         struct iscsi_np *np,
 706         struct iscsi_conn *conn,
 707         u8 zero_tsih)
 708 {
 709         int stop_timer = 0;
 710         struct iscsi_session *sess = conn->sess;
 711         struct se_session *se_sess = sess->se_sess;
 712         struct iscsi_portal_group *tpg = sess->tpg;
 713         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 714         struct iscsi_thread_set *ts;
 715
 716         iscsit_inc_conn_usage_count(conn);
 717
 718         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 719                         ISCSI_LOGIN_STATUS_ACCEPT);
 720
 721         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 722         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 723
 724         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 725         iscsit_set_sync_and_steering_values(conn);
 726         /*
 727          * SCSI Initiator -> SCSI Target Port Mapping
 728          */
 729         ts = iscsi_get_thread_set();
 730         if (!zero_tsih) {
 731                 iscsi_set_session_parameters(sess->sess_ops,
 732                                 conn->param_list, 0);
 733                 iscsi_release_param_list(conn->param_list);
 734                 conn->param_list = NULL;
 735
 736                 spin_lock_bh(&sess->conn_lock);
 737                 atomic_set(&sess->session_continuation, 0);
 738                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 739                         pr_debug("Moving to"
 740                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 741                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 742                         stop_timer = 1;
 743                 }
 744
 745                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 746                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 747                         conn->local_ip, conn->local_port, tpg->tpgt);
 748
 749                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 750                 atomic_inc(&sess->nconn);
 751                 pr_debug("Incremented iSCSI Connection count to %hu"
 752                         " from node: %s\n", atomic_read(&sess->nconn),
 753                         sess->sess_ops->InitiatorName);
 754                 spin_unlock_bh(&sess->conn_lock);
 755
 756                 iscsi_post_login_start_timers(conn);
 757
 758                 iscsi_activate_thread_set(conn, ts);
 759                 /*
 760                  * Determine CPU mask to ensure connection's RX and TX kthreads
 761                  * are scheduled on the same CPU.
 762                  */
 763                 iscsit_thread_get_cpumask(conn);
 764                 conn->conn_rx_reset_cpumask = 1;
 765                 conn->conn_tx_reset_cpumask = 1;
 766
 767                 iscsit_dec_conn_usage_count(conn);
 768                 if (stop_timer) {
 769                         spin_lock_bh(&se_tpg->session_lock);
 770                         iscsit_stop_time2retain_timer(sess);
 771                         spin_unlock_bh(&se_tpg->session_lock);
 772                 }
 773                 iscsit_dec_session_usage_count(sess);
 774                 return 0;
 775         }
 776
 777         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 778         iscsi_release_param_list(conn->param_list);
 779         conn->param_list = NULL;
 780
 781         iscsit_determine_maxcmdsn(sess);
 782
 783         spin_lock_bh(&se_tpg->session_lock);
 784         __transport_register_session(&sess->tpg->tpg_se_tpg,
 785                         se_sess->se_node_acl, se_sess, sess);
 786         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 787         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 788
 789         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 790                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 791                 tpg->tpgt);
 792
 793         spin_lock_bh(&sess->conn_lock);
 794         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 795         atomic_inc(&sess->nconn);
 796         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 797                 " %s\n", atomic_read(&sess->nconn),
 798                 sess->sess_ops->InitiatorName);
 799         spin_unlock_bh(&sess->conn_lock);
 800
 801         sess->sid = tpg->sid++;
 802         if (!sess->sid)
 803                 sess->sid = tpg->sid++;
 804         pr_debug("Established iSCSI session from node: %s\n",
 805                         sess->sess_ops->InitiatorName);
 806
 807         tpg->nsessions++;
 808         if (tpg->tpg_tiqn)
 809                 tpg->tpg_tiqn->tiqn_nsessions++;
 810
 811         pr_debug("Incremented number of active iSCSI sessions to %u on"
 812                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 813         spin_unlock_bh(&se_tpg->session_lock);
 814
 815         iscsi_post_login_start_timers(conn);
 816         iscsi_activate_thread_set(conn, ts);
 817         /*
 818          * Determine CPU mask to ensure connection's RX and TX kthreads
 819          * are scheduled on the same CPU.
 820          */
 821         iscsit_thread_get_cpumask(conn);
 822         conn->conn_rx_reset_cpumask = 1;
 823         conn->conn_tx_reset_cpumask = 1;
 824
 825         iscsit_dec_conn_usage_count(conn);
 826
 827         return 0;
 828 }
 829
 830 static void iscsi_handle_login_thread_timeout(unsigned long data)
 831 {
 832         struct iscsi_np *np = (struct iscsi_np *) data;
 833
 834         spin_lock_bh(&np->np_thread_lock);
 835         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 836                         np->np_ip, np->np_port);
 837
 838         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 839                 spin_unlock_bh(&np->np_thread_lock);
 840                 return;
 841         }
 842
 843         if (np->np_thread)
 844                 send_sig(SIGINT, np->np_thread, 1);
 845
 846         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 847         spin_unlock_bh(&np->np_thread_lock);
 848 }
 849
 850 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 851 {
 852         /*
 853          * This used the TA_LOGIN_TIMEOUT constant because at this
 854          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 855          */
 856         spin_lock_bh(&np->np_thread_lock);
 857         init_timer(&np->np_login_timer);
 858         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 859         np->np_login_timer.data = (unsigned long)np;
 860         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 861         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 862         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 863         add_timer(&np->np_login_timer);
 864
 865         pr_debug("Added timeout timer to iSCSI login request for"
 866                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 867         spin_unlock_bh(&np->np_thread_lock);
 868 }
 869
 870 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 871 {
 872         spin_lock_bh(&np->np_thread_lock);
 873         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 874                 spin_unlock_bh(&np->np_thread_lock);
 875                 return;
 876         }
 877         np->np_login_timer_flags |= ISCSI_TF_STOP;
 878         spin_unlock_bh(&np->np_thread_lock);
 879
 880         del_timer_sync(&np->np_login_timer);
 881
 882         spin_lock_bh(&np->np_thread_lock);
 883         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 884         spin_unlock_bh(&np->np_thread_lock);
 885 }
 886
 887 int iscsit_setup_np(
 888         struct iscsi_np *np,
 889         struct __kernel_sockaddr_storage *sockaddr)
 890 {
 891         struct socket *sock = NULL;
 892         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 893
 894         switch (np->np_network_transport) {
 895         case ISCSI_TCP:
 896                 np->np_ip_proto = IPPROTO_TCP;
 897                 np->np_sock_type = SOCK_STREAM;
 898                 break;
 899         case ISCSI_SCTP_TCP:
 900                 np->np_ip_proto = IPPROTO_SCTP;
 901                 np->np_sock_type = SOCK_STREAM;
 902                 break;
 903         case ISCSI_SCTP_UDP:
 904                 np->np_ip_proto = IPPROTO_SCTP;
 905                 np->np_sock_type = SOCK_SEQPACKET;
 906                 break;
 907         default:
 908                 pr_err("Unsupported network_transport: %d\n",
 909                                 np->np_network_transport);
 910                 return -EINVAL;
 911         }
 912
 913         np->np_ip_proto = IPPROTO_TCP;
 914         np->np_sock_type = SOCK_STREAM;
 915
 916         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 917                         np->np_ip_proto, &sock);
 918         if (ret < 0) {
 919                 pr_err("sock_create() failed.\n");
 920                 return ret;
 921         }
 922         np->np_socket = sock;
 923         /*
 924          * Setup the np->np_sockaddr from the passed sockaddr setup
 925          * in iscsi_target_configfs.c code..
 926          */
 927         memcpy(&np->np_sockaddr, sockaddr,
 928                         sizeof(struct __kernel_sockaddr_storage));
 929
 930         if (sockaddr->ss_family == AF_INET6)
 931                 len = sizeof(struct sockaddr_in6);
 932         else
 933                 len = sizeof(struct sockaddr_in);
 934         /*
 935          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 936          */
 937         /* FIXME: Someone please explain why this is endian-safe */
 938         opt = 1;
 939         if (np->np_network_transport == ISCSI_TCP) {
 940                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 941                                 (char *)&opt, sizeof(opt));
 942                 if (ret < 0) {
 943                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 944                                 " failed: %d\n", ret);
 945                         goto fail;
 946                 }
 947         }
 948
 949         /* FIXME: Someone please explain why this is endian-safe */
 950         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 951                         (char *)&opt, sizeof(opt));
 952         if (ret < 0) {
 953                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 954                         " failed\n");
 955                 goto fail;
 956         }
 957
 958         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 959                         (char *)&opt, sizeof(opt));
 960         if (ret < 0) {
 961                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 962                         " failed\n");
 963                 goto fail;
 964         }
 965
 966         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 967         if (ret < 0) {
 968                 pr_err("kernel_bind() failed: %d\n", ret);
 969                 goto fail;
 970         }
 971
 972         ret = kernel_listen(sock, backlog);
 973         if (ret != 0) {
 974                 pr_err("kernel_listen() failed: %d\n", ret);
 975                 goto fail;
 976         }
 977
 978         return 0;
 979 fail:
 980         np->np_socket = NULL;
 981         if (sock)
 982                 sock_release(sock);
 983         return ret;
 984 }
 985
 986 int iscsi_target_setup_login_socket(
 987         struct iscsi_np *np,
 988         struct __kernel_sockaddr_storage *sockaddr)
 989 {
 990         struct iscsit_transport *t;
 991         int rc;
 992
 993         t = iscsit_get_transport(np->np_network_transport);
 994         if (!t)
 995                 return -EINVAL;
 996
 997         rc = t->iscsit_setup_np(np, sockaddr);
 998         if (rc < 0) {
 999                 iscsit_put_transport(t);
1000                 return rc;
1001         }
1002
1003         np->np_transport = t;
1004         np->enabled = true;
1005         return 0;
1006 }
1007
1008 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1009 {
1010         struct socket *new_sock, *sock = np->np_socket;
1011         struct sockaddr_in sock_in;
1012         struct sockaddr_in6 sock_in6;
1013         int rc, err;
1014
1015         rc = kernel_accept(sock, &new_sock, 0);
1016         if (rc < 0)
1017                 return rc;
1018
1019         conn->sock = new_sock;
1020         conn->login_family = np->np_sockaddr.ss_family;
1021
1022         if (np->np_sockaddr.ss_family == AF_INET6) {
1023                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1024
1025                 rc = conn->sock->ops->getname(conn->sock,
1026                                 (struct sockaddr *)&sock_in6, &err, 1);
1027                 if (!rc) {
1028                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1029                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1030                                         &sock_in6.sin6_addr.in6_u);
1031                         else
1032                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1033                                         &sock_in6.sin6_addr.s6_addr32[3]);
1034                         conn->login_port = ntohs(sock_in6.sin6_port);
1035                 }
1036
1037                 rc = conn->sock->ops->getname(conn->sock,
1038                                 (struct sockaddr *)&sock_in6, &err, 0);
1039                 if (!rc) {
1040                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1041                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1042                                         &sock_in6.sin6_addr.in6_u);
1043                         else
1044                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1045                                         &sock_in6.sin6_addr.s6_addr32[3]);
1046                         conn->local_port = ntohs(sock_in6.sin6_port);
1047                 }
1048         } else {
1049                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1050
1051                 rc = conn->sock->ops->getname(conn->sock,
1052                                 (struct sockaddr *)&sock_in, &err, 1);
1053                 if (!rc) {
1054                         sprintf(conn->login_ip, "%pI4",
1055                                         &sock_in.sin_addr.s_addr);
1056                         conn->login_port = ntohs(sock_in.sin_port);
1057                 }
1058
1059                 rc = conn->sock->ops->getname(conn->sock,
1060                                 (struct sockaddr *)&sock_in, &err, 0);
1061                 if (!rc) {
1062                         sprintf(conn->local_ip, "%pI4",
1063                                         &sock_in.sin_addr.s_addr);
1064                         conn->local_port = ntohs(sock_in.sin_port);
1065                 }
1066         }
1067
1068         return 0;
1069 }
1070
1071 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1072 {
1073         struct iscsi_login_req *login_req;
1074         u32 padding = 0, payload_length;
1075
1076         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1077                 return -1;
1078
1079         login_req = (struct iscsi_login_req *)login->req;
1080         payload_length  = ntoh24(login_req->dlength);
1081         padding = ((-payload_length) & 3);
1082
1083         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1084                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1085                 login_req->flags, login_req->itt, login_req->cmdsn,
1086                 login_req->exp_statsn, login_req->cid, payload_length);
1087         /*
1088          * Setup the initial iscsi_login values from the leading
1089          * login request PDU.
1090          */
1091         if (login->first_request) {
1092                 login_req = (struct iscsi_login_req *)login->req;
1093                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1094                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1095                 login->version_min      = login_req->min_version;
1096                 login->version_max      = login_req->max_version;
1097                 memcpy(login->isid, login_req->isid, 6);
1098                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1099                 login->init_task_tag    = login_req->itt;
1100                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1101                 login->cid              = be16_to_cpu(login_req->cid);
1102                 login->tsih             = be16_to_cpu(login_req->tsih);
1103         }
1104
1105         if (iscsi_target_check_login_request(conn, login) < 0)
1106                 return -1;
1107
1108         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1109         if (iscsi_login_rx_data(conn, login->req_buf,
1110                                 payload_length + padding) < 0)
1111                 return -1;
1112
1113         return 0;
1114 }
1115
1116 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1117                         u32 length)
1118 {
1119         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1120                 return -1;
1121
1122         return 0;
1123 }
1124
1125 static int
1126 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1127 {
1128         int rc;
1129
1130         if (!t->owner) {
1131                 conn->conn_transport = t;
1132                 return 0;
1133         }
1134
1135         rc = try_module_get(t->owner);
1136         if (!rc) {
1137                 pr_err("try_module_get() failed for %s\n", t->name);
1138                 return -EINVAL;
1139         }
1140
1141         conn->conn_transport = t;
1142         return 0;
1143 }
1144
1145 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1146                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1147 {
1148         if (new_sess == false)
1149                 goto old_sess_out;
1150
1151         pr_err("iSCSI Login negotiation failed.\n");
1152         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1153                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1154         if (!zero_tsih || !conn->sess)
1155                 goto old_sess_out;
1156         if (conn->sess->se_sess)
1157                 transport_free_session(conn->sess->se_sess);
1158         if (conn->sess->session_index != 0) {
1159                 spin_lock_bh(&sess_idr_lock);
1160                 idr_remove(&sess_idr, conn->sess->session_index);
1161                 spin_unlock_bh(&sess_idr_lock);
1162         }
1163         kfree(conn->sess->sess_ops);
1164         kfree(conn->sess);
1165
1166 old_sess_out:
1167         iscsi_stop_login_thread_timer(np);
1168         /*
1169          * If login negotiation fails check if the Time2Retain timer
1170          * needs to be restarted.
1171          */
1172         if (!zero_tsih && conn->sess) {
1173                 spin_lock_bh(&conn->sess->conn_lock);
1174                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1175                         struct se_portal_group *se_tpg =
1176                                         &conn->tpg->tpg_se_tpg;
1177
1178                         atomic_set(&conn->sess->session_continuation, 0);
1179                         spin_unlock_bh(&conn->sess->conn_lock);
1180                         spin_lock_bh(&se_tpg->session_lock);
1181                         iscsit_start_time2retain_handler(conn->sess);
1182                         spin_unlock_bh(&se_tpg->session_lock);
1183                 } else
1184                         spin_unlock_bh(&conn->sess->conn_lock);
1185                 iscsit_dec_session_usage_count(conn->sess);
1186         }
1187
1188         if (!IS_ERR(conn->conn_rx_hash.tfm))
1189                 crypto_free_hash(conn->conn_rx_hash.tfm);
1190         if (!IS_ERR(conn->conn_tx_hash.tfm))
1191                 crypto_free_hash(conn->conn_tx_hash.tfm);
1192
1193         if (conn->conn_cpumask)
1194                 free_cpumask_var(conn->conn_cpumask);
1195
1196         kfree(conn->conn_ops);
1197
1198         if (conn->param_list) {
1199                 iscsi_release_param_list(conn->param_list);
1200                 conn->param_list = NULL;
1201         }
1202         iscsi_target_nego_release(conn);
1203
1204         if (conn->sock) {
1205                 sock_release(conn->sock);
1206                 conn->sock = NULL;
1207         }
1208
1209         if (conn->conn_transport->iscsit_free_conn)
1210                 conn->conn_transport->iscsit_free_conn(conn);
1211
1212         iscsit_put_transport(conn->conn_transport);
1213         kfree(conn);
1214 }
1215
1216 static int __iscsi_target_login_thread(struct iscsi_np *np)
1217 {
1218         u8 *buffer, zero_tsih = 0;
1219         int ret = 0, rc, stop;
1220         struct iscsi_conn *conn = NULL;
1221         struct iscsi_login *login;
1222         struct iscsi_portal_group *tpg = NULL;
1223         struct iscsi_login_req *pdu;
1224         struct iscsi_tpg_np *tpg_np;
1225         bool new_sess = false;
1226
1227         flush_signals(current);
1228
1229         spin_lock_bh(&np->np_thread_lock);
1230         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1231                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1232                 complete(&np->np_restart_comp);
1233         } else {
1234                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1235         }
1236         spin_unlock_bh(&np->np_thread_lock);
1237
1238         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1239         if (!conn) {
1240                 pr_err("Could not allocate memory for"
1241                         " new connection\n");
1242                 /* Get another socket */
1243                 return 1;
1244         }
1245         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1246         conn->conn_state = TARG_CONN_STATE_FREE;
1247
1248         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1249                 kfree(conn);
1250                 return 1;
1251         }
1252
1253         rc = np->np_transport->iscsit_accept_np(np, conn);
1254         if (rc == -ENOSYS) {
1255                 complete(&np->np_restart_comp);
1256                 iscsit_put_transport(conn->conn_transport);
1257                 kfree(conn);
1258                 conn = NULL;
1259                 goto exit;
1260         } else if (rc < 0) {
1261                 spin_lock_bh(&np->np_thread_lock);
1262                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1263                         spin_unlock_bh(&np->np_thread_lock);
1264                         complete(&np->np_restart_comp);
1265                         iscsit_put_transport(conn->conn_transport);
1266                         kfree(conn);
1267                         conn = NULL;
1268                         if (ret == -ENODEV)
1269                                 goto out;
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         tpg = conn->tpg;
1369         if (!tpg) {
1370                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1371                 goto new_sess_out;
1372         }
1373
1374         if (zero_tsih) {
1375                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1376                         goto new_sess_out;
1377         } else {
1378                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1379                         goto old_sess_out;
1380         }
1381
1382         ret = iscsi_target_start_negotiation(login, conn);
1383         if (ret < 0)
1384                 goto new_sess_out;
1385
1386         if (!conn->sess) {
1387                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1388                 goto new_sess_out;
1389         }
1390
1391         iscsi_stop_login_thread_timer(np);
1392
1393         if (signal_pending(current))
1394                 goto new_sess_out;
1395
1396         if (ret == 1) {
1397                 tpg_np = conn->tpg_np;
1398
1399                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1400                 if (ret < 0)
1401                         goto new_sess_out;
1402
1403                 iscsit_deaccess_np(np, tpg, tpg_np);
1404         }
1405
1406         tpg = NULL;
1407         tpg_np = NULL;
1408         /* Get another socket */
1409         return 1;
1410
1411 new_sess_out:
1412         new_sess = true;
1413 old_sess_out:
1414         tpg_np = conn->tpg_np;
1415         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1416         new_sess = false;
1417
1418         if (tpg) {
1419                 iscsit_deaccess_np(np, tpg, tpg_np);
1420                 tpg = NULL;
1421                 tpg_np = NULL;
1422         }
1423
1424 out:
1425         stop = kthread_should_stop();
1426         /* Wait for another socket.. */
1427         if (!stop)
1428                 return 1;
1429 exit:
1430         iscsi_stop_login_thread_timer(np);
1431         spin_lock_bh(&np->np_thread_lock);
1432         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1433         spin_unlock_bh(&np->np_thread_lock);
1434
1435         return 0;
1436 }
1437
1438 int iscsi_target_login_thread(void *arg)
1439 {
1440         struct iscsi_np *np = arg;
1441         int ret;
1442
1443         allow_signal(SIGINT);
1444
1445         while (!kthread_should_stop()) {
1446                 ret = __iscsi_target_login_thread(np);
1447                 /*
1448                  * We break and exit here unless another sock_accept() call
1449                  * is expected.
1450                  */
1451                 if (ret != 1)
1452                         break;
1453         }
1454
1455         return 0;
1456 }