drivers/target/iscsi/iscsi_target_login.c

   1 /*******************************************************************************
   2  * This file contains the login functions used by the iSCSI Target driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/idr.h>
  25 #include <scsi/iscsi_proto.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include "iscsi_target_core.h"
  30 #include "iscsi_target_tq.h"
  31 #include "iscsi_target_device.h"
  32 #include "iscsi_target_nego.h"
  33 #include "iscsi_target_erl0.h"
  34 #include "iscsi_target_erl2.h"
  35 #include "iscsi_target_login.h"
  36 #include "iscsi_target_stat.h"
  37 #include "iscsi_target_tpg.h"
  38 #include "iscsi_target_util.h"
  39 #include "iscsi_target.h"
  40 #include "iscsi_target_parameters.h"
  41
  42 #include <target/iscsi/iscsi_transport.h>
  43
  44 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  45 {
  46         struct iscsi_login *login;
  47
  48         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  49         if (!login) {
  50                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  51                 return NULL;
  52         }
  53         login->conn = conn;
  54         login->first_request = 1;
  55
  56         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  57         if (!login->req_buf) {
  58                 pr_err("Unable to allocate memory for response buffer.\n");
  59                 goto out_login;
  60         }
  61
  62         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  63         if (!login->rsp_buf) {
  64                 pr_err("Unable to allocate memory for request buffer.\n");
  65                 goto out_req_buf;
  66         }
  67
  68         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  69         if (!conn->conn_ops) {
  70                 pr_err("Unable to allocate memory for"
  71                         " struct iscsi_conn_ops.\n");
  72                 goto out_rsp_buf;
  73         }
  74
  75         init_waitqueue_head(&conn->queues_wq);
  76         INIT_LIST_HEAD(&conn->conn_list);
  77         INIT_LIST_HEAD(&conn->conn_cmd_list);
  78         INIT_LIST_HEAD(&conn->immed_queue_list);
  79         INIT_LIST_HEAD(&conn->response_queue_list);
  80         init_completion(&conn->conn_post_wait_comp);
  81         init_completion(&conn->conn_wait_comp);
  82         init_completion(&conn->conn_wait_rcfr_comp);
  83         init_completion(&conn->conn_waiting_on_uc_comp);
  84         init_completion(&conn->conn_logout_comp);
  85         init_completion(&conn->rx_half_close_comp);
  86         init_completion(&conn->tx_half_close_comp);
  87         spin_lock_init(&conn->cmd_lock);
  88         spin_lock_init(&conn->conn_usage_lock);
  89         spin_lock_init(&conn->immed_queue_lock);
  90         spin_lock_init(&conn->nopin_timer_lock);
  91         spin_lock_init(&conn->response_queue_lock);
  92         spin_lock_init(&conn->state_lock);
  93
  94         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  95                 pr_err("Unable to allocate conn->conn_cpumask\n");
  96                 goto out_conn_ops;
  97         }
  98         conn->conn_login = login;
  99
 100         return login;
 101
 102 out_conn_ops:
 103         kfree(conn->conn_ops);
 104 out_rsp_buf:
 105         kfree(login->rsp_buf);
 106 out_req_buf:
 107         kfree(login->req_buf);
 108 out_login:
 109         kfree(login);
 110         return NULL;
 111 }
 112
 113 /*
 114  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 115  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 116  */
 117 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 118 {
 119         /*
 120          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 121          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 122          * to software 1x8 byte slicing from crc32c.ko
 123          */
 124         conn->conn_rx_hash.flags = 0;
 125         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 126                                                 CRYPTO_ALG_ASYNC);
 127         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 128                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 129                 return -ENOMEM;
 130         }
 131
 132         conn->conn_tx_hash.flags = 0;
 133         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 134                                                 CRYPTO_ALG_ASYNC);
 135         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 136                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 137                 crypto_free_hash(conn->conn_rx_hash.tfm);
 138                 return -ENOMEM;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int iscsi_login_check_initiator_version(
 145         struct iscsi_conn *conn,
 146         u8 version_max,
 147         u8 version_min)
 148 {
 149         if ((version_max != 0x00) || (version_min != 0x00)) {
 150                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 151                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 152                         version_min, version_max);
 153                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 154                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 155                 return -1;
 156         }
 157
 158         return 0;
 159 }
 160
 161 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 162 {
 163         int sessiontype;
 164         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 165         struct iscsi_portal_group *tpg = conn->tpg;
 166         struct iscsi_session *sess = NULL, *sess_p = NULL;
 167         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 168         struct se_session *se_sess, *se_sess_tmp;
 169
 170         initiatorname_param = iscsi_find_param_from_key(
 171                         INITIATORNAME, conn->param_list);
 172         sessiontype_param = iscsi_find_param_from_key(
 173                         SESSIONTYPE, conn->param_list);
 174         if (!initiatorname_param || !sessiontype_param) {
 175                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 176                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 177                 return -1;
 178         }
 179
 180         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 181
 182         spin_lock_bh(&se_tpg->session_lock);
 183         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 184                         sess_list) {
 185
 186                 sess_p = se_sess->fabric_sess_ptr;
 187                 spin_lock(&sess_p->conn_lock);
 188                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 189                     atomic_read(&sess_p->session_logout) ||
 190                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 191                         spin_unlock(&sess_p->conn_lock);
 192                         continue;
 193                 }
 194                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 195                    (!strcmp(sess_p->sess_ops->InitiatorName,
 196                             initiatorname_param->value) &&
 197                    (sess_p->sess_ops->SessionType == sessiontype))) {
 198                         atomic_set(&sess_p->session_reinstatement, 1);
 199                         spin_unlock(&sess_p->conn_lock);
 200                         iscsit_inc_session_usage_count(sess_p);
 201                         iscsit_stop_time2retain_timer(sess_p);
 202                         sess = sess_p;
 203                         break;
 204                 }
 205                 spin_unlock(&sess_p->conn_lock);
 206         }
 207         spin_unlock_bh(&se_tpg->session_lock);
 208         /*
 209          * If the Time2Retain handler has expired, the session is already gone.
 210          */
 211         if (!sess)
 212                 return 0;
 213
 214         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 215                 " preforming session reinstatement.\n", (sessiontype) ?
 216                 "Discovery" : "Normal", sess->sid,
 217                 sess->sess_ops->InitiatorName);
 218
 219         spin_lock_bh(&sess->conn_lock);
 220         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 221                 spin_unlock_bh(&sess->conn_lock);
 222                 iscsit_dec_session_usage_count(sess);
 223                 target_put_session(sess->se_sess);
 224                 return 0;
 225         }
 226         spin_unlock_bh(&sess->conn_lock);
 227
 228         iscsit_stop_session(sess, 1, 1);
 229         iscsit_dec_session_usage_count(sess);
 230
 231         target_put_session(sess->se_sess);
 232         return 0;
 233 }
 234
 235 static void iscsi_login_set_conn_values(
 236         struct iscsi_session *sess,
 237         struct iscsi_conn *conn,
 238         __be16 cid)
 239 {
 240         conn->sess              = sess;
 241         conn->cid               = be16_to_cpu(cid);
 242         /*
 243          * Generate a random Status sequence number (statsn) for the new
 244          * iSCSI connection.
 245          */
 246         get_random_bytes(&conn->stat_sn, sizeof(u32));
 247
 248         mutex_lock(&auth_id_lock);
 249         conn->auth_id           = iscsit_global->auth_id++;
 250         mutex_unlock(&auth_id_lock);
 251 }
 252
 253 static __printf(2, 3) int iscsi_change_param_sprintf(
 254         struct iscsi_conn *conn,
 255         const char *fmt, ...)
 256 {
 257         va_list args;
 258         unsigned char buf[64];
 259
 260         memset(buf, 0, sizeof buf);
 261
 262         va_start(args, fmt);
 263         vsnprintf(buf, sizeof buf, fmt, args);
 264         va_end(args);
 265
 266         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 267                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 268                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 269                 return -1;
 270         }
 271
 272         return 0;
 273 }
 274
 275 /*
 276  *      This is the leading connection of a new session,
 277  *      or session reinstatement.
 278  */
 279 static int iscsi_login_zero_tsih_s1(
 280         struct iscsi_conn *conn,
 281         unsigned char *buf)
 282 {
 283         struct iscsi_session *sess = NULL;
 284         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 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         spin_lock_init(&sess->session_stats_lock);
 332         /*
 333          * The FFP CmdSN window values will be allocated from the TPG's
 334          * Initiator Node's ACL once the login has been successfully completed.
 335          */
 336         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 337
 338         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 339         if (!sess->sess_ops) {
 340                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 341                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 342                 pr_err("Unable to allocate memory for"
 343                                 " struct iscsi_sess_ops.\n");
 344                 kfree(sess);
 345                 return -ENOMEM;
 346         }
 347
 348         sess->se_sess = transport_init_session();
 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 = ++ISCSI_TPG_S(sess)->ntsih;
 373         if (!sess->tsih)
 374                 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
 375
 376         /*
 377          * Create the default params from user defined values..
 378          */
 379         if (iscsi_copy_param_list(&conn->param_list,
 380                                 ISCSI_TPG_C(conn)->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 = strict_strtoul(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                         return 0;
 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
 461         return 0;
 462 }
 463
 464 /*
 465  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 466  * The Initiator node will be able to enable FIM by proposing them itself.
 467  */
 468 int iscsi_login_disable_FIM_keys(
 469         struct iscsi_param_list *param_list,
 470         struct iscsi_conn *conn)
 471 {
 472         struct iscsi_param *param;
 473
 474         param = iscsi_find_param_from_key("OFMarker", param_list);
 475         if (!param) {
 476                 pr_err("iscsi_find_param_from_key() for"
 477                                 " OFMarker failed\n");
 478                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 479                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 480                 return -1;
 481         }
 482         param->state &= ~PSTATE_NEGOTIATE;
 483
 484         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 485         if (!param) {
 486                 pr_err("iscsi_find_param_from_key() for"
 487                                 " IFMarker failed\n");
 488                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 489                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 490                 return -1;
 491         }
 492         param->state &= ~PSTATE_NEGOTIATE;
 493
 494         param = iscsi_find_param_from_key("IFMarker", param_list);
 495         if (!param) {
 496                 pr_err("iscsi_find_param_from_key() for"
 497                                 " IFMarker failed\n");
 498                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 499                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 500                 return -1;
 501         }
 502         param->state &= ~PSTATE_NEGOTIATE;
 503
 504         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 505         if (!param) {
 506                 pr_err("iscsi_find_param_from_key() for"
 507                                 " IFMarker failed\n");
 508                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 509                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 510                 return -1;
 511         }
 512         param->state &= ~PSTATE_NEGOTIATE;
 513
 514         return 0;
 515 }
 516
 517 static int iscsi_login_non_zero_tsih_s1(
 518         struct iscsi_conn *conn,
 519         unsigned char *buf)
 520 {
 521         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 522
 523         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 524         return 0;
 525 }
 526
 527 /*
 528  *      Add a new connection to an existing session.
 529  */
 530 static int iscsi_login_non_zero_tsih_s2(
 531         struct iscsi_conn *conn,
 532         unsigned char *buf)
 533 {
 534         struct iscsi_portal_group *tpg = conn->tpg;
 535         struct iscsi_session *sess = NULL, *sess_p = NULL;
 536         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 537         struct se_session *se_sess, *se_sess_tmp;
 538         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 539         bool iser = false;
 540
 541         spin_lock_bh(&se_tpg->session_lock);
 542         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 543                         sess_list) {
 544
 545                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 546                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 547                     atomic_read(&sess_p->session_logout) ||
 548                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 549                         continue;
 550                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 551                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 552                         iscsit_inc_session_usage_count(sess_p);
 553                         iscsit_stop_time2retain_timer(sess_p);
 554                         sess = sess_p;
 555                         break;
 556                 }
 557         }
 558         spin_unlock_bh(&se_tpg->session_lock);
 559
 560         /*
 561          * If the Time2Retain handler has expired, the session is already gone.
 562          */
 563         if (!sess) {
 564                 pr_err("Initiator attempting to add a connection to"
 565                         " a non-existent session, rejecting iSCSI Login.\n");
 566                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 567                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 568                 return -1;
 569         }
 570
 571         /*
 572          * Stop the Time2Retain timer if this is a failed session, we restart
 573          * the timer if the login is not successful.
 574          */
 575         spin_lock_bh(&sess->conn_lock);
 576         if (sess->session_state == TARG_SESS_STATE_FAILED)
 577                 atomic_set(&sess->session_continuation, 1);
 578         spin_unlock_bh(&sess->conn_lock);
 579
 580         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 581
 582         if (iscsi_copy_param_list(&conn->param_list,
 583                         ISCSI_TPG_C(conn)->param_list, 0) < 0) {
 584                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 585                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 586                 return -1;
 587         }
 588
 589         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 590                 iser = true;
 591
 592         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 593         /*
 594          * Need to send TargetPortalGroupTag back in first login response
 595          * on any iSCSI connection where the Initiator provides TargetName.
 596          * See 5.3.1.  Login Phase Start
 597          *
 598          * In our case, we have already located the struct iscsi_tiqn at this point.
 599          */
 600         memset(buf, 0, 32);
 601         sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
 602         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 603                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 604                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 605                 return -1;
 606         }
 607
 608         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 609 }
 610
 611 int iscsi_login_post_auth_non_zero_tsih(
 612         struct iscsi_conn *conn,
 613         u16 cid,
 614         u32 exp_statsn)
 615 {
 616         struct iscsi_conn *conn_ptr = NULL;
 617         struct iscsi_conn_recovery *cr = NULL;
 618         struct iscsi_session *sess = conn->sess;
 619
 620         /*
 621          * By following item 5 in the login table,  if we have found
 622          * an existing ISID and a valid/existing TSIH and an existing
 623          * CID we do connection reinstatement.  Currently we dont not
 624          * support it so we send back an non-zero status class to the
 625          * initiator and release the new connection.
 626          */
 627         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 628         if (conn_ptr) {
 629                 pr_err("Connection exists with CID %hu for %s,"
 630                         " performing connection reinstatement.\n",
 631                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 632
 633                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 634                 iscsit_dec_conn_usage_count(conn_ptr);
 635         }
 636
 637         /*
 638          * Check for any connection recovery entires containing CID.
 639          * We use the original ExpStatSN sent in the first login request
 640          * to acknowledge commands for the failed connection.
 641          *
 642          * Also note that an explict logout may have already been sent,
 643          * but the response may not be sent due to additional connection
 644          * loss.
 645          */
 646         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 647                 cr = iscsit_get_inactive_connection_recovery_entry(
 648                                 sess, cid);
 649                 if (cr) {
 650                         pr_debug("Performing implicit logout"
 651                                 " for connection recovery on CID: %hu\n",
 652                                         conn->cid);
 653                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 654                 }
 655         }
 656
 657         /*
 658          * Else we follow item 4 from the login table in that we have
 659          * found an existing ISID and a valid/existing TSIH and a new
 660          * CID we go ahead and continue to add a new connection to the
 661          * session.
 662          */
 663         pr_debug("Adding CID %hu to existing session for %s.\n",
 664                         cid, sess->sess_ops->InitiatorName);
 665
 666         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 667                 pr_err("Adding additional connection to this session"
 668                         " would exceed MaxConnections %d, login failed.\n",
 669                                 sess->sess_ops->MaxConnections);
 670                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 671                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 672                 return -1;
 673         }
 674
 675         return 0;
 676 }
 677
 678 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 679 {
 680         struct iscsi_session *sess = conn->sess;
 681         /*
 682          * FIXME: Unsolicitied NopIN support for ISER
 683          */
 684         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 685                 return;
 686
 687         if (!sess->sess_ops->SessionType)
 688                 iscsit_start_nopin_timer(conn);
 689 }
 690
 691 static int iscsi_post_login_handler(
 692         struct iscsi_np *np,
 693         struct iscsi_conn *conn,
 694         u8 zero_tsih)
 695 {
 696         int stop_timer = 0;
 697         struct iscsi_session *sess = conn->sess;
 698         struct se_session *se_sess = sess->se_sess;
 699         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
 700         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 701         struct iscsi_thread_set *ts;
 702
 703         iscsit_inc_conn_usage_count(conn);
 704
 705         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 706                         ISCSI_LOGIN_STATUS_ACCEPT);
 707
 708         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 709         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 710
 711         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 712         iscsit_set_sync_and_steering_values(conn);
 713         /*
 714          * SCSI Initiator -> SCSI Target Port Mapping
 715          */
 716         ts = iscsi_get_thread_set();
 717         if (!zero_tsih) {
 718                 iscsi_set_session_parameters(sess->sess_ops,
 719                                 conn->param_list, 0);
 720                 iscsi_release_param_list(conn->param_list);
 721                 conn->param_list = NULL;
 722
 723                 spin_lock_bh(&sess->conn_lock);
 724                 atomic_set(&sess->session_continuation, 0);
 725                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 726                         pr_debug("Moving to"
 727                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 728                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 729                         stop_timer = 1;
 730                 }
 731
 732                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 733                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 734                         conn->local_ip, conn->local_port, tpg->tpgt);
 735
 736                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 737                 atomic_inc(&sess->nconn);
 738                 pr_debug("Incremented iSCSI Connection count to %hu"
 739                         " from node: %s\n", atomic_read(&sess->nconn),
 740                         sess->sess_ops->InitiatorName);
 741                 spin_unlock_bh(&sess->conn_lock);
 742
 743                 iscsi_post_login_start_timers(conn);
 744
 745                 iscsi_activate_thread_set(conn, ts);
 746                 /*
 747                  * Determine CPU mask to ensure connection's RX and TX kthreads
 748                  * are scheduled on the same CPU.
 749                  */
 750                 iscsit_thread_get_cpumask(conn);
 751                 conn->conn_rx_reset_cpumask = 1;
 752                 conn->conn_tx_reset_cpumask = 1;
 753
 754                 iscsit_dec_conn_usage_count(conn);
 755                 if (stop_timer) {
 756                         spin_lock_bh(&se_tpg->session_lock);
 757                         iscsit_stop_time2retain_timer(sess);
 758                         spin_unlock_bh(&se_tpg->session_lock);
 759                 }
 760                 iscsit_dec_session_usage_count(sess);
 761                 return 0;
 762         }
 763
 764         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 765         iscsi_release_param_list(conn->param_list);
 766         conn->param_list = NULL;
 767
 768         iscsit_determine_maxcmdsn(sess);
 769
 770         spin_lock_bh(&se_tpg->session_lock);
 771         __transport_register_session(&sess->tpg->tpg_se_tpg,
 772                         se_sess->se_node_acl, se_sess, sess);
 773         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 774         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 775
 776         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 777                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 778                 tpg->tpgt);
 779
 780         spin_lock_bh(&sess->conn_lock);
 781         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 782         atomic_inc(&sess->nconn);
 783         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 784                 " %s\n", atomic_read(&sess->nconn),
 785                 sess->sess_ops->InitiatorName);
 786         spin_unlock_bh(&sess->conn_lock);
 787
 788         sess->sid = tpg->sid++;
 789         if (!sess->sid)
 790                 sess->sid = tpg->sid++;
 791         pr_debug("Established iSCSI session from node: %s\n",
 792                         sess->sess_ops->InitiatorName);
 793
 794         tpg->nsessions++;
 795         if (tpg->tpg_tiqn)
 796                 tpg->tpg_tiqn->tiqn_nsessions++;
 797
 798         pr_debug("Incremented number of active iSCSI sessions to %u on"
 799                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 800         spin_unlock_bh(&se_tpg->session_lock);
 801
 802         iscsi_post_login_start_timers(conn);
 803         iscsi_activate_thread_set(conn, ts);
 804         /*
 805          * Determine CPU mask to ensure connection's RX and TX kthreads
 806          * are scheduled on the same CPU.
 807          */
 808         iscsit_thread_get_cpumask(conn);
 809         conn->conn_rx_reset_cpumask = 1;
 810         conn->conn_tx_reset_cpumask = 1;
 811
 812         iscsit_dec_conn_usage_count(conn);
 813
 814         return 0;
 815 }
 816
 817 static void iscsi_handle_login_thread_timeout(unsigned long data)
 818 {
 819         struct iscsi_np *np = (struct iscsi_np *) data;
 820
 821         spin_lock_bh(&np->np_thread_lock);
 822         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 823                         np->np_ip, np->np_port);
 824
 825         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 826                 spin_unlock_bh(&np->np_thread_lock);
 827                 return;
 828         }
 829
 830         if (np->np_thread)
 831                 send_sig(SIGINT, np->np_thread, 1);
 832
 833         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 834         spin_unlock_bh(&np->np_thread_lock);
 835 }
 836
 837 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 838 {
 839         /*
 840          * This used the TA_LOGIN_TIMEOUT constant because at this
 841          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 842          */
 843         spin_lock_bh(&np->np_thread_lock);
 844         init_timer(&np->np_login_timer);
 845         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 846         np->np_login_timer.data = (unsigned long)np;
 847         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 848         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 849         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 850         add_timer(&np->np_login_timer);
 851
 852         pr_debug("Added timeout timer to iSCSI login request for"
 853                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 854         spin_unlock_bh(&np->np_thread_lock);
 855 }
 856
 857 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 858 {
 859         spin_lock_bh(&np->np_thread_lock);
 860         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 861                 spin_unlock_bh(&np->np_thread_lock);
 862                 return;
 863         }
 864         np->np_login_timer_flags |= ISCSI_TF_STOP;
 865         spin_unlock_bh(&np->np_thread_lock);
 866
 867         del_timer_sync(&np->np_login_timer);
 868
 869         spin_lock_bh(&np->np_thread_lock);
 870         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 871         spin_unlock_bh(&np->np_thread_lock);
 872 }
 873
 874 int iscsit_setup_np(
 875         struct iscsi_np *np,
 876         struct __kernel_sockaddr_storage *sockaddr)
 877 {
 878         struct socket *sock = NULL;
 879         int backlog = 5, ret, opt = 0, len;
 880
 881         switch (np->np_network_transport) {
 882         case ISCSI_TCP:
 883                 np->np_ip_proto = IPPROTO_TCP;
 884                 np->np_sock_type = SOCK_STREAM;
 885                 break;
 886         case ISCSI_SCTP_TCP:
 887                 np->np_ip_proto = IPPROTO_SCTP;
 888                 np->np_sock_type = SOCK_STREAM;
 889                 break;
 890         case ISCSI_SCTP_UDP:
 891                 np->np_ip_proto = IPPROTO_SCTP;
 892                 np->np_sock_type = SOCK_SEQPACKET;
 893                 break;
 894         default:
 895                 pr_err("Unsupported network_transport: %d\n",
 896                                 np->np_network_transport);
 897                 return -EINVAL;
 898         }
 899
 900         np->np_ip_proto = IPPROTO_TCP;
 901         np->np_sock_type = SOCK_STREAM;
 902
 903         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 904                         np->np_ip_proto, &sock);
 905         if (ret < 0) {
 906                 pr_err("sock_create() failed.\n");
 907                 return ret;
 908         }
 909         np->np_socket = sock;
 910         /*
 911          * Setup the np->np_sockaddr from the passed sockaddr setup
 912          * in iscsi_target_configfs.c code..
 913          */
 914         memcpy(&np->np_sockaddr, sockaddr,
 915                         sizeof(struct __kernel_sockaddr_storage));
 916
 917         if (sockaddr->ss_family == AF_INET6)
 918                 len = sizeof(struct sockaddr_in6);
 919         else
 920                 len = sizeof(struct sockaddr_in);
 921         /*
 922          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 923          */
 924         /* FIXME: Someone please explain why this is endian-safe */
 925         opt = 1;
 926         if (np->np_network_transport == ISCSI_TCP) {
 927                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 928                                 (char *)&opt, sizeof(opt));
 929                 if (ret < 0) {
 930                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 931                                 " failed: %d\n", ret);
 932                         goto fail;
 933                 }
 934         }
 935
 936         /* FIXME: Someone please explain why this is endian-safe */
 937         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 938                         (char *)&opt, sizeof(opt));
 939         if (ret < 0) {
 940                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 941                         " failed\n");
 942                 goto fail;
 943         }
 944
 945         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 946                         (char *)&opt, sizeof(opt));
 947         if (ret < 0) {
 948                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 949                         " failed\n");
 950                 goto fail;
 951         }
 952
 953         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 954         if (ret < 0) {
 955                 pr_err("kernel_bind() failed: %d\n", ret);
 956                 goto fail;
 957         }
 958
 959         ret = kernel_listen(sock, backlog);
 960         if (ret != 0) {
 961                 pr_err("kernel_listen() failed: %d\n", ret);
 962                 goto fail;
 963         }
 964
 965         return 0;
 966 fail:
 967         np->np_socket = NULL;
 968         if (sock)
 969                 sock_release(sock);
 970         return ret;
 971 }
 972
 973 int iscsi_target_setup_login_socket(
 974         struct iscsi_np *np,
 975         struct __kernel_sockaddr_storage *sockaddr)
 976 {
 977         struct iscsit_transport *t;
 978         int rc;
 979
 980         t = iscsit_get_transport(np->np_network_transport);
 981         if (!t)
 982                 return -EINVAL;
 983
 984         rc = t->iscsit_setup_np(np, sockaddr);
 985         if (rc < 0) {
 986                 iscsit_put_transport(t);
 987                 return rc;
 988         }
 989
 990         np->np_transport = t;
 991         np->enabled = true;
 992         return 0;
 993 }
 994
 995 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 996 {
 997         struct socket *new_sock, *sock = np->np_socket;
 998         struct sockaddr_in sock_in;
 999         struct sockaddr_in6 sock_in6;
1000         int rc, err;
1001
1002         rc = kernel_accept(sock, &new_sock, 0);
1003         if (rc < 0)
1004                 return rc;
1005
1006         conn->sock = new_sock;
1007         conn->login_family = np->np_sockaddr.ss_family;
1008
1009         if (np->np_sockaddr.ss_family == AF_INET6) {
1010                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1011
1012                 rc = conn->sock->ops->getname(conn->sock,
1013                                 (struct sockaddr *)&sock_in6, &err, 1);
1014                 if (!rc) {
1015                         snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1016                                 &sock_in6.sin6_addr.in6_u);
1017                         conn->login_port = ntohs(sock_in6.sin6_port);
1018                 }
1019
1020                 rc = conn->sock->ops->getname(conn->sock,
1021                                 (struct sockaddr *)&sock_in6, &err, 0);
1022                 if (!rc) {
1023                         snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c",
1024                                 &sock_in6.sin6_addr.in6_u);
1025                         conn->local_port = ntohs(sock_in6.sin6_port);
1026                 }
1027         } else {
1028                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1029
1030                 rc = conn->sock->ops->getname(conn->sock,
1031                                 (struct sockaddr *)&sock_in, &err, 1);
1032                 if (!rc) {
1033                         sprintf(conn->login_ip, "%pI4",
1034                                         &sock_in.sin_addr.s_addr);
1035                         conn->login_port = ntohs(sock_in.sin_port);
1036                 }
1037
1038                 rc = conn->sock->ops->getname(conn->sock,
1039                                 (struct sockaddr *)&sock_in, &err, 0);
1040                 if (!rc) {
1041                         sprintf(conn->local_ip, "%pI4",
1042                                         &sock_in.sin_addr.s_addr);
1043                         conn->local_port = ntohs(sock_in.sin_port);
1044                 }
1045         }
1046
1047         return 0;
1048 }
1049
1050 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1051 {
1052         struct iscsi_login_req *login_req;
1053         u32 padding = 0, payload_length;
1054
1055         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1056                 return -1;
1057
1058         login_req = (struct iscsi_login_req *)login->req;
1059         payload_length  = ntoh24(login_req->dlength);
1060         padding = ((-payload_length) & 3);
1061
1062         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1063                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1064                 login_req->flags, login_req->itt, login_req->cmdsn,
1065                 login_req->exp_statsn, login_req->cid, payload_length);
1066         /*
1067          * Setup the initial iscsi_login values from the leading
1068          * login request PDU.
1069          */
1070         if (login->first_request) {
1071                 login_req = (struct iscsi_login_req *)login->req;
1072                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1073                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1074                 login->version_min      = login_req->min_version;
1075                 login->version_max      = login_req->max_version;
1076                 memcpy(login->isid, login_req->isid, 6);
1077                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1078                 login->init_task_tag    = login_req->itt;
1079                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1080                 login->cid              = be16_to_cpu(login_req->cid);
1081                 login->tsih             = be16_to_cpu(login_req->tsih);
1082         }
1083
1084         if (iscsi_target_check_login_request(conn, login) < 0)
1085                 return -1;
1086
1087         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1088         if (iscsi_login_rx_data(conn, login->req_buf,
1089                                 payload_length + padding) < 0)
1090                 return -1;
1091
1092         return 0;
1093 }
1094
1095 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1096                         u32 length)
1097 {
1098         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1099                 return -1;
1100
1101         return 0;
1102 }
1103
1104 static int
1105 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1106 {
1107         int rc;
1108
1109         if (!t->owner) {
1110                 conn->conn_transport = t;
1111                 return 0;
1112         }
1113
1114         rc = try_module_get(t->owner);
1115         if (!rc) {
1116                 pr_err("try_module_get() failed for %s\n", t->name);
1117                 return -EINVAL;
1118         }
1119
1120         conn->conn_transport = t;
1121         return 0;
1122 }
1123
1124 static int __iscsi_target_login_thread(struct iscsi_np *np)
1125 {
1126         u8 *buffer, zero_tsih = 0;
1127         int ret = 0, rc, stop;
1128         struct iscsi_conn *conn = NULL;
1129         struct iscsi_login *login;
1130         struct iscsi_portal_group *tpg = NULL;
1131         struct iscsi_login_req *pdu;
1132
1133         flush_signals(current);
1134
1135         spin_lock_bh(&np->np_thread_lock);
1136         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1137                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1138                 complete(&np->np_restart_comp);
1139         } else {
1140                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1141         }
1142         spin_unlock_bh(&np->np_thread_lock);
1143
1144         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1145         if (!conn) {
1146                 pr_err("Could not allocate memory for"
1147                         " new connection\n");
1148                 /* Get another socket */
1149                 return 1;
1150         }
1151         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1152         conn->conn_state = TARG_CONN_STATE_FREE;
1153
1154         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1155                 kfree(conn);
1156                 return 1;
1157         }
1158
1159         rc = np->np_transport->iscsit_accept_np(np, conn);
1160         if (rc == -ENOSYS) {
1161                 complete(&np->np_restart_comp);
1162                 iscsit_put_transport(conn->conn_transport);
1163                 kfree(conn);
1164                 conn = NULL;
1165                 goto exit;
1166         } else if (rc < 0) {
1167                 spin_lock_bh(&np->np_thread_lock);
1168                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1169                         spin_unlock_bh(&np->np_thread_lock);
1170                         complete(&np->np_restart_comp);
1171                         iscsit_put_transport(conn->conn_transport);
1172                         kfree(conn);
1173                         conn = NULL;
1174                         if (ret == -ENODEV)
1175                                 goto out;
1176                         /* Get another socket */
1177                         return 1;
1178                 }
1179                 spin_unlock_bh(&np->np_thread_lock);
1180                 iscsit_put_transport(conn->conn_transport);
1181                 kfree(conn);
1182                 conn = NULL;
1183                 goto out;
1184         }
1185         /*
1186          * Perform the remaining iSCSI connection initialization items..
1187          */
1188         login = iscsi_login_init_conn(conn);
1189         if (!login) {
1190                 goto new_sess_out;
1191         }
1192
1193         iscsi_start_login_thread_timer(np);
1194
1195         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1196         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1197         /*
1198          * This will process the first login request + payload..
1199          */
1200         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1201         if (rc == 1)
1202                 return 1;
1203         else if (rc < 0)
1204                 goto new_sess_out;
1205
1206         buffer = &login->req[0];
1207         pdu = (struct iscsi_login_req *)buffer;
1208         /*
1209          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1210          * when Status-Class != 0.
1211         */
1212         conn->login_itt = pdu->itt;
1213
1214         spin_lock_bh(&np->np_thread_lock);
1215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1216                 spin_unlock_bh(&np->np_thread_lock);
1217                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1218                         " active.\n", np->np_ip, np->np_port);
1219                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1220                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1221                 goto new_sess_out;
1222         }
1223         spin_unlock_bh(&np->np_thread_lock);
1224
1225         conn->network_transport = np->np_network_transport;
1226
1227         pr_debug("Received iSCSI login request from %s on %s Network"
1228                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1229                 conn->local_ip, conn->local_port);
1230
1231         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1232         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1233
1234         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1235                         pdu->min_version) < 0)
1236                 goto new_sess_out;
1237
1238         zero_tsih = (pdu->tsih == 0x0000);
1239         if (zero_tsih) {
1240                 /*
1241                  * This is the leading connection of a new session.
1242                  * We wait until after authentication to check for
1243                  * session reinstatement.
1244                  */
1245                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1246                         goto new_sess_out;
1247         } else {
1248                 /*
1249                  * Add a new connection to an existing session.
1250                  * We check for a non-existant session in
1251                  * iscsi_login_non_zero_tsih_s2() below based
1252                  * on ISID/TSIH, but wait until after authentication
1253                  * to check for connection reinstatement, etc.
1254                  */
1255                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1256                         goto new_sess_out;
1257         }
1258         /*
1259          * SessionType: Discovery
1260          *
1261          *      Locates Default Portal
1262          *
1263          * SessionType: Normal
1264          *
1265          *      Locates Target Portal from NP -> Target IQN
1266          */
1267         rc = iscsi_target_locate_portal(np, conn, login);
1268         if (rc < 0) {
1269                 tpg = conn->tpg;
1270                 goto new_sess_out;
1271         }
1272
1273         tpg = conn->tpg;
1274         if (!tpg) {
1275                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1276                 goto new_sess_out;
1277         }
1278
1279         if (zero_tsih) {
1280                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1281                         goto new_sess_out;
1282         } else {
1283                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1284                         goto old_sess_out;
1285         }
1286
1287         if (iscsi_target_start_negotiation(login, conn) < 0)
1288                 goto new_sess_out;
1289
1290         if (!conn->sess) {
1291                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1292                 goto new_sess_out;
1293         }
1294
1295         iscsi_stop_login_thread_timer(np);
1296
1297         if (signal_pending(current))
1298                 goto new_sess_out;
1299
1300         ret = iscsi_post_login_handler(np, conn, zero_tsih);
1301
1302         if (ret < 0)
1303                 goto new_sess_out;
1304
1305         iscsit_deaccess_np(np, tpg);
1306         tpg = NULL;
1307         /* Get another socket */
1308         return 1;
1309
1310 new_sess_out:
1311         pr_err("iSCSI Login negotiation failed.\n");
1312         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1313                                   ISCSI_LOGIN_STATUS_INIT_ERR);
1314         if (!zero_tsih || !conn->sess)
1315                 goto old_sess_out;
1316         if (conn->sess->se_sess)
1317                 transport_free_session(conn->sess->se_sess);
1318         if (conn->sess->session_index != 0) {
1319                 spin_lock_bh(&sess_idr_lock);
1320                 idr_remove(&sess_idr, conn->sess->session_index);
1321                 spin_unlock_bh(&sess_idr_lock);
1322         }
1323         kfree(conn->sess->sess_ops);
1324         kfree(conn->sess);
1325 old_sess_out:
1326         iscsi_stop_login_thread_timer(np);
1327         /*
1328          * If login negotiation fails check if the Time2Retain timer
1329          * needs to be restarted.
1330          */
1331         if (!zero_tsih && conn->sess) {
1332                 spin_lock_bh(&conn->sess->conn_lock);
1333                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1334                         struct se_portal_group *se_tpg =
1335                                         &ISCSI_TPG_C(conn)->tpg_se_tpg;
1336
1337                         atomic_set(&conn->sess->session_continuation, 0);
1338                         spin_unlock_bh(&conn->sess->conn_lock);
1339                         spin_lock_bh(&se_tpg->session_lock);
1340                         iscsit_start_time2retain_handler(conn->sess);
1341                         spin_unlock_bh(&se_tpg->session_lock);
1342                 } else
1343                         spin_unlock_bh(&conn->sess->conn_lock);
1344                 iscsit_dec_session_usage_count(conn->sess);
1345         }
1346
1347         if (!IS_ERR(conn->conn_rx_hash.tfm))
1348                 crypto_free_hash(conn->conn_rx_hash.tfm);
1349         if (!IS_ERR(conn->conn_tx_hash.tfm))
1350                 crypto_free_hash(conn->conn_tx_hash.tfm);
1351
1352         if (conn->conn_cpumask)
1353                 free_cpumask_var(conn->conn_cpumask);
1354
1355         kfree(conn->conn_ops);
1356
1357         if (conn->param_list) {
1358                 iscsi_release_param_list(conn->param_list);
1359                 conn->param_list = NULL;
1360         }
1361         iscsi_target_nego_release(conn);
1362
1363         if (conn->sock) {
1364                 sock_release(conn->sock);
1365                 conn->sock = NULL;
1366         }
1367
1368         if (conn->conn_transport->iscsit_free_conn)
1369                 conn->conn_transport->iscsit_free_conn(conn);
1370
1371         iscsit_put_transport(conn->conn_transport);
1372
1373         kfree(conn);
1374
1375         if (tpg) {
1376                 iscsit_deaccess_np(np, tpg);
1377                 tpg = NULL;
1378         }
1379
1380 out:
1381         stop = kthread_should_stop();
1382         if (!stop && signal_pending(current)) {
1383                 spin_lock_bh(&np->np_thread_lock);
1384                 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1385                 spin_unlock_bh(&np->np_thread_lock);
1386         }
1387         /* Wait for another socket.. */
1388         if (!stop)
1389                 return 1;
1390 exit:
1391         iscsi_stop_login_thread_timer(np);
1392         spin_lock_bh(&np->np_thread_lock);
1393         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1394         np->np_thread = NULL;
1395         spin_unlock_bh(&np->np_thread_lock);
1396
1397         return 0;
1398 }
1399
1400 int iscsi_target_login_thread(void *arg)
1401 {
1402         struct iscsi_np *np = arg;
1403         int ret;
1404
1405         allow_signal(SIGINT);
1406
1407         while (!kthread_should_stop()) {
1408                 ret = __iscsi_target_login_thread(np);
1409                 /*
1410                  * We break and exit here unless another sock_accept() call
1411                  * is expected.
1412                  */
1413                 if (ret != 1)
1414                         break;
1415         }
1416
1417         return 0;
1418 }