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 <target/iscsi/iscsi_target_core.h>
  28 #include <target/iscsi/iscsi_target_stat.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_tpg.h"
  35 #include "iscsi_target_util.h"
  36 #include "iscsi_target.h"
  37 #include "iscsi_target_parameters.h"
  38
  39 #include <target/iscsi/iscsi_transport.h>
  40
  41 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  42 {
  43         struct iscsi_login *login;
  44
  45         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  46         if (!login) {
  47                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  48                 return NULL;
  49         }
  50         conn->login = login;
  51         login->conn = conn;
  52         login->first_request = 1;
  53
  54         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  55         if (!login->req_buf) {
  56                 pr_err("Unable to allocate memory for response buffer.\n");
  57                 goto out_login;
  58         }
  59
  60         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  61         if (!login->rsp_buf) {
  62                 pr_err("Unable to allocate memory for request buffer.\n");
  63                 goto out_req_buf;
  64         }
  65
  66         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  67         if (!conn->conn_ops) {
  68                 pr_err("Unable to allocate memory for"
  69                         " struct iscsi_conn_ops.\n");
  70                 goto out_rsp_buf;
  71         }
  72
  73         init_waitqueue_head(&conn->queues_wq);
  74         INIT_LIST_HEAD(&conn->conn_list);
  75         INIT_LIST_HEAD(&conn->conn_cmd_list);
  76         INIT_LIST_HEAD(&conn->immed_queue_list);
  77         INIT_LIST_HEAD(&conn->response_queue_list);
  78         init_completion(&conn->conn_post_wait_comp);
  79         init_completion(&conn->conn_wait_comp);
  80         init_completion(&conn->conn_wait_rcfr_comp);
  81         init_completion(&conn->conn_waiting_on_uc_comp);
  82         init_completion(&conn->conn_logout_comp);
  83         init_completion(&conn->rx_half_close_comp);
  84         init_completion(&conn->tx_half_close_comp);
  85         init_completion(&conn->rx_login_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                         atomic_set(&sess_p->session_fall_back_to_erl0, 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                 goto free_sess;
 327         }
 328
 329         sess->creation_time = get_jiffies_64();
 330         /*
 331          * The FFP CmdSN window values will be allocated from the TPG's
 332          * Initiator Node's ACL once the login has been successfully completed.
 333          */
 334         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 335
 336         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 337         if (!sess->sess_ops) {
 338                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 339                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 340                 pr_err("Unable to allocate memory for"
 341                                 " struct iscsi_sess_ops.\n");
 342                 goto remove_idr;
 343         }
 344
 345         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 346         if (IS_ERR(sess->se_sess)) {
 347                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 348                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 349                 goto free_ops;
 350         }
 351
 352         return 0;
 353
 354 free_ops:
 355         kfree(sess->sess_ops);
 356 remove_idr:
 357         spin_lock_bh(&sess_idr_lock);
 358         idr_remove(&sess_idr, sess->session_index);
 359         spin_unlock_bh(&sess_idr_lock);
 360 free_sess:
 361         kfree(sess);
 362         conn->sess = NULL;
 363         return -ENOMEM;
 364 }
 365
 366 static int iscsi_login_zero_tsih_s2(
 367         struct iscsi_conn *conn)
 368 {
 369         struct iscsi_node_attrib *na;
 370         struct iscsi_session *sess = conn->sess;
 371         bool iser = false;
 372
 373         sess->tpg = conn->tpg;
 374
 375         /*
 376          * Assign a new TPG Session Handle.  Note this is protected with
 377          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 378          */
 379         sess->tsih = ++sess->tpg->ntsih;
 380         if (!sess->tsih)
 381                 sess->tsih = ++sess->tpg->ntsih;
 382
 383         /*
 384          * Create the default params from user defined values..
 385          */
 386         if (iscsi_copy_param_list(&conn->param_list,
 387                                 conn->tpg->param_list, 1) < 0) {
 388                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 389                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 390                 return -1;
 391         }
 392
 393         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 394                 iser = true;
 395
 396         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 397
 398         if (sess->sess_ops->SessionType)
 399                 return iscsi_set_keys_irrelevant_for_discovery(
 400                                 conn->param_list);
 401
 402         na = iscsit_tpg_get_node_attrib(sess);
 403
 404         /*
 405          * Need to send TargetPortalGroupTag back in first login response
 406          * on any iSCSI connection where the Initiator provides TargetName.
 407          * See 5.3.1.  Login Phase Start
 408          *
 409          * In our case, we have already located the struct iscsi_tiqn at this point.
 410          */
 411         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 412                 return -1;
 413
 414         /*
 415          * Workaround for Initiators that have broken connection recovery logic.
 416          *
 417          * "We would really like to get rid of this." Linux-iSCSI.org team
 418          */
 419         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 420                 return -1;
 421
 422         /*
 423          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 424          */
 425         if (iser) {
 426                 struct iscsi_param *param;
 427                 unsigned long mrdsl, off;
 428                 int rc;
 429
 430                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 431                         return -1;
 432
 433                 /*
 434                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 435                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 436                  */
 437                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 438                                                   conn->param_list);
 439                 if (!param) {
 440                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 441                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 442                         return -1;
 443                 }
 444                 rc = kstrtoul(param->value, 0, &mrdsl);
 445                 if (rc < 0) {
 446                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 447                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 448                         return -1;
 449                 }
 450                 off = mrdsl % PAGE_SIZE;
 451                 if (!off)
 452                         goto check_prot;
 453
 454                 if (mrdsl < PAGE_SIZE)
 455                         mrdsl = PAGE_SIZE;
 456                 else
 457                         mrdsl -= off;
 458
 459                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 460                         " to PAGE_SIZE\n", mrdsl);
 461
 462                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 463                         return -1;
 464                 /*
 465                  * ISER currently requires that ImmediateData + Unsolicited
 466                  * Data be disabled when protection / signature MRs are enabled.
 467                  */
 468 check_prot:
 469                 if (sess->se_sess->sup_prot_ops &
 470                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 471                     TARGET_PROT_DOUT_INSERT)) {
 472
 473                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 474                                 return -1;
 475
 476                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 477                                 return -1;
 478
 479                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 480                                  " T10-PI enabled ISER session\n");
 481                 }
 482         }
 483
 484         return 0;
 485 }
 486
 487 static int iscsi_login_non_zero_tsih_s1(
 488         struct iscsi_conn *conn,
 489         unsigned char *buf)
 490 {
 491         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 492
 493         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 494         return 0;
 495 }
 496
 497 /*
 498  *      Add a new connection to an existing session.
 499  */
 500 static int iscsi_login_non_zero_tsih_s2(
 501         struct iscsi_conn *conn,
 502         unsigned char *buf)
 503 {
 504         struct iscsi_portal_group *tpg = conn->tpg;
 505         struct iscsi_session *sess = NULL, *sess_p = NULL;
 506         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 507         struct se_session *se_sess, *se_sess_tmp;
 508         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 509         bool iser = false;
 510
 511         spin_lock_bh(&se_tpg->session_lock);
 512         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 513                         sess_list) {
 514
 515                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 516                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 517                     atomic_read(&sess_p->session_logout) ||
 518                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 519                         continue;
 520                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 521                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 522                         iscsit_inc_session_usage_count(sess_p);
 523                         iscsit_stop_time2retain_timer(sess_p);
 524                         sess = sess_p;
 525                         break;
 526                 }
 527         }
 528         spin_unlock_bh(&se_tpg->session_lock);
 529
 530         /*
 531          * If the Time2Retain handler has expired, the session is already gone.
 532          */
 533         if (!sess) {
 534                 pr_err("Initiator attempting to add a connection to"
 535                         " a non-existent session, rejecting iSCSI Login.\n");
 536                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 537                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 538                 return -1;
 539         }
 540
 541         /*
 542          * Stop the Time2Retain timer if this is a failed session, we restart
 543          * the timer if the login is not successful.
 544          */
 545         spin_lock_bh(&sess->conn_lock);
 546         if (sess->session_state == TARG_SESS_STATE_FAILED)
 547                 atomic_set(&sess->session_continuation, 1);
 548         spin_unlock_bh(&sess->conn_lock);
 549
 550         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 551
 552         if (iscsi_copy_param_list(&conn->param_list,
 553                         conn->tpg->param_list, 0) < 0) {
 554                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 555                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 556                 return -1;
 557         }
 558
 559         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 560                 iser = true;
 561
 562         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 563         /*
 564          * Need to send TargetPortalGroupTag back in first login response
 565          * on any iSCSI connection where the Initiator provides TargetName.
 566          * See 5.3.1.  Login Phase Start
 567          *
 568          * In our case, we have already located the struct iscsi_tiqn at this point.
 569          */
 570         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 571                 return -1;
 572
 573         return 0;
 574 }
 575
 576 int iscsi_login_post_auth_non_zero_tsih(
 577         struct iscsi_conn *conn,
 578         u16 cid,
 579         u32 exp_statsn)
 580 {
 581         struct iscsi_conn *conn_ptr = NULL;
 582         struct iscsi_conn_recovery *cr = NULL;
 583         struct iscsi_session *sess = conn->sess;
 584
 585         /*
 586          * By following item 5 in the login table,  if we have found
 587          * an existing ISID and a valid/existing TSIH and an existing
 588          * CID we do connection reinstatement.  Currently we dont not
 589          * support it so we send back an non-zero status class to the
 590          * initiator and release the new connection.
 591          */
 592         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 593         if (conn_ptr) {
 594                 pr_err("Connection exists with CID %hu for %s,"
 595                         " performing connection reinstatement.\n",
 596                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 597
 598                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 599                 iscsit_dec_conn_usage_count(conn_ptr);
 600         }
 601
 602         /*
 603          * Check for any connection recovery entires containing CID.
 604          * We use the original ExpStatSN sent in the first login request
 605          * to acknowledge commands for the failed connection.
 606          *
 607          * Also note that an explict logout may have already been sent,
 608          * but the response may not be sent due to additional connection
 609          * loss.
 610          */
 611         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 612                 cr = iscsit_get_inactive_connection_recovery_entry(
 613                                 sess, cid);
 614                 if (cr) {
 615                         pr_debug("Performing implicit logout"
 616                                 " for connection recovery on CID: %hu\n",
 617                                         conn->cid);
 618                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 619                 }
 620         }
 621
 622         /*
 623          * Else we follow item 4 from the login table in that we have
 624          * found an existing ISID and a valid/existing TSIH and a new
 625          * CID we go ahead and continue to add a new connection to the
 626          * session.
 627          */
 628         pr_debug("Adding CID %hu to existing session for %s.\n",
 629                         cid, sess->sess_ops->InitiatorName);
 630
 631         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 632                 pr_err("Adding additional connection to this session"
 633                         " would exceed MaxConnections %d, login failed.\n",
 634                                 sess->sess_ops->MaxConnections);
 635                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 636                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 637                 return -1;
 638         }
 639
 640         return 0;
 641 }
 642
 643 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 644 {
 645         struct iscsi_session *sess = conn->sess;
 646         /*
 647          * FIXME: Unsolicitied NopIN support for ISER
 648          */
 649         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 650                 return;
 651
 652         if (!sess->sess_ops->SessionType)
 653                 iscsit_start_nopin_timer(conn);
 654 }
 655
 656 int iscsit_start_kthreads(struct iscsi_conn *conn)
 657 {
 658         int ret = 0;
 659
 660         spin_lock(&iscsit_global->ts_bitmap_lock);
 661         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 662                                         ISCSIT_BITMAP_BITS, get_order(1));
 663         spin_unlock(&iscsit_global->ts_bitmap_lock);
 664
 665         if (conn->bitmap_id < 0) {
 666                 pr_err("bitmap_find_free_region() failed for"
 667                        " iscsit_start_kthreads()\n");
 668                 return -ENOMEM;
 669         }
 670
 671         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 672                                       "%s", ISCSI_TX_THREAD_NAME);
 673         if (IS_ERR(conn->tx_thread)) {
 674                 pr_err("Unable to start iscsi_target_tx_thread\n");
 675                 ret = PTR_ERR(conn->tx_thread);
 676                 goto out_bitmap;
 677         }
 678         conn->tx_thread_active = true;
 679
 680         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 681                                       "%s", ISCSI_RX_THREAD_NAME);
 682         if (IS_ERR(conn->rx_thread)) {
 683                 pr_err("Unable to start iscsi_target_rx_thread\n");
 684                 ret = PTR_ERR(conn->rx_thread);
 685                 goto out_tx;
 686         }
 687         conn->rx_thread_active = true;
 688
 689         return 0;
 690 out_tx:
 691         send_sig(SIGINT, conn->tx_thread, 1);
 692         kthread_stop(conn->tx_thread);
 693         conn->tx_thread_active = false;
 694 out_bitmap:
 695         spin_lock(&iscsit_global->ts_bitmap_lock);
 696         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 697                               get_order(1));
 698         spin_unlock(&iscsit_global->ts_bitmap_lock);
 699         return ret;
 700 }
 701
 702 void iscsi_post_login_handler(
 703         struct iscsi_np *np,
 704         struct iscsi_conn *conn,
 705         u8 zero_tsih)
 706 {
 707         int stop_timer = 0;
 708         struct iscsi_session *sess = conn->sess;
 709         struct se_session *se_sess = sess->se_sess;
 710         struct iscsi_portal_group *tpg = sess->tpg;
 711         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 712
 713         iscsit_inc_conn_usage_count(conn);
 714
 715         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 716                         ISCSI_LOGIN_STATUS_ACCEPT);
 717
 718         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 719         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 720
 721         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 722         /*
 723          * SCSI Initiator -> SCSI Target Port Mapping
 724          */
 725         if (!zero_tsih) {
 726                 iscsi_set_session_parameters(sess->sess_ops,
 727                                 conn->param_list, 0);
 728                 iscsi_release_param_list(conn->param_list);
 729                 conn->param_list = NULL;
 730
 731                 spin_lock_bh(&sess->conn_lock);
 732                 atomic_set(&sess->session_continuation, 0);
 733                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 734                         pr_debug("Moving to"
 735                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 736                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 737                         stop_timer = 1;
 738                 }
 739
 740                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 741                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 742                         &conn->local_sockaddr, tpg->tpgt);
 743
 744                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 745                 atomic_inc(&sess->nconn);
 746                 pr_debug("Incremented iSCSI Connection count to %hu"
 747                         " from node: %s\n", atomic_read(&sess->nconn),
 748                         sess->sess_ops->InitiatorName);
 749                 spin_unlock_bh(&sess->conn_lock);
 750
 751                 iscsi_post_login_start_timers(conn);
 752                 /*
 753                  * Determine CPU mask to ensure connection's RX and TX kthreads
 754                  * are scheduled on the same CPU.
 755                  */
 756                 iscsit_thread_get_cpumask(conn);
 757                 conn->conn_rx_reset_cpumask = 1;
 758                 conn->conn_tx_reset_cpumask = 1;
 759                 /*
 760                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 761                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 762                  */
 763                 complete(&conn->rx_login_comp);
 764                 iscsit_dec_conn_usage_count(conn);
 765
 766                 if (stop_timer) {
 767                         spin_lock_bh(&se_tpg->session_lock);
 768                         iscsit_stop_time2retain_timer(sess);
 769                         spin_unlock_bh(&se_tpg->session_lock);
 770                 }
 771                 iscsit_dec_session_usage_count(sess);
 772                 return;
 773         }
 774
 775         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 776         iscsi_release_param_list(conn->param_list);
 777         conn->param_list = NULL;
 778
 779         iscsit_determine_maxcmdsn(sess);
 780
 781         spin_lock_bh(&se_tpg->session_lock);
 782         __transport_register_session(&sess->tpg->tpg_se_tpg,
 783                         se_sess->se_node_acl, se_sess, sess);
 784         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 785         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 786
 787         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 788                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 789                 tpg->tpgt);
 790
 791         spin_lock_bh(&sess->conn_lock);
 792         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 793         atomic_inc(&sess->nconn);
 794         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 795                 " %s\n", atomic_read(&sess->nconn),
 796                 sess->sess_ops->InitiatorName);
 797         spin_unlock_bh(&sess->conn_lock);
 798
 799         sess->sid = tpg->sid++;
 800         if (!sess->sid)
 801                 sess->sid = tpg->sid++;
 802         pr_debug("Established iSCSI session from node: %s\n",
 803                         sess->sess_ops->InitiatorName);
 804
 805         tpg->nsessions++;
 806         if (tpg->tpg_tiqn)
 807                 tpg->tpg_tiqn->tiqn_nsessions++;
 808
 809         pr_debug("Incremented number of active iSCSI sessions to %u on"
 810                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 811         spin_unlock_bh(&se_tpg->session_lock);
 812
 813         iscsi_post_login_start_timers(conn);
 814         /*
 815          * Determine CPU mask to ensure connection's RX and TX kthreads
 816          * are scheduled on the same CPU.
 817          */
 818         iscsit_thread_get_cpumask(conn);
 819         conn->conn_rx_reset_cpumask = 1;
 820         conn->conn_tx_reset_cpumask = 1;
 821         /*
 822          * Wakeup the sleeping iscsi_target_rx_thread() now that
 823          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 824          */
 825         complete(&conn->rx_login_comp);
 826         iscsit_dec_conn_usage_count(conn);
 827 }
 828
 829 static void iscsi_handle_login_thread_timeout(unsigned long data)
 830 {
 831         struct iscsi_np *np = (struct iscsi_np *) data;
 832
 833         spin_lock_bh(&np->np_thread_lock);
 834         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 835                         &np->np_sockaddr);
 836
 837         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 838                 spin_unlock_bh(&np->np_thread_lock);
 839                 return;
 840         }
 841
 842         if (np->np_thread)
 843                 send_sig(SIGINT, np->np_thread, 1);
 844
 845         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 846         spin_unlock_bh(&np->np_thread_lock);
 847 }
 848
 849 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 850 {
 851         /*
 852          * This used the TA_LOGIN_TIMEOUT constant because at this
 853          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 854          */
 855         spin_lock_bh(&np->np_thread_lock);
 856         init_timer(&np->np_login_timer);
 857         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 858         np->np_login_timer.data = (unsigned long)np;
 859         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 860         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 861         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 862         add_timer(&np->np_login_timer);
 863
 864         pr_debug("Added timeout timer to iSCSI login request for"
 865                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 866         spin_unlock_bh(&np->np_thread_lock);
 867 }
 868
 869 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 870 {
 871         spin_lock_bh(&np->np_thread_lock);
 872         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 873                 spin_unlock_bh(&np->np_thread_lock);
 874                 return;
 875         }
 876         np->np_login_timer_flags |= ISCSI_TF_STOP;
 877         spin_unlock_bh(&np->np_thread_lock);
 878
 879         del_timer_sync(&np->np_login_timer);
 880
 881         spin_lock_bh(&np->np_thread_lock);
 882         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 883         spin_unlock_bh(&np->np_thread_lock);
 884 }
 885
 886 int iscsit_setup_np(
 887         struct iscsi_np *np,
 888         struct sockaddr_storage *sockaddr)
 889 {
 890         struct socket *sock = NULL;
 891         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 892
 893         switch (np->np_network_transport) {
 894         case ISCSI_TCP:
 895                 np->np_ip_proto = IPPROTO_TCP;
 896                 np->np_sock_type = SOCK_STREAM;
 897                 break;
 898         case ISCSI_SCTP_TCP:
 899                 np->np_ip_proto = IPPROTO_SCTP;
 900                 np->np_sock_type = SOCK_STREAM;
 901                 break;
 902         case ISCSI_SCTP_UDP:
 903                 np->np_ip_proto = IPPROTO_SCTP;
 904                 np->np_sock_type = SOCK_SEQPACKET;
 905                 break;
 906         default:
 907                 pr_err("Unsupported network_transport: %d\n",
 908                                 np->np_network_transport);
 909                 return -EINVAL;
 910         }
 911
 912         np->np_ip_proto = IPPROTO_TCP;
 913         np->np_sock_type = SOCK_STREAM;
 914
 915         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 916                         np->np_ip_proto, &sock);
 917         if (ret < 0) {
 918                 pr_err("sock_create() failed.\n");
 919                 return ret;
 920         }
 921         np->np_socket = sock;
 922         /*
 923          * Setup the np->np_sockaddr from the passed sockaddr setup
 924          * in iscsi_target_configfs.c code..
 925          */
 926         memcpy(&np->np_sockaddr, sockaddr,
 927                         sizeof(struct sockaddr_storage));
 928
 929         if (sockaddr->ss_family == AF_INET6)
 930                 len = sizeof(struct sockaddr_in6);
 931         else
 932                 len = sizeof(struct sockaddr_in);
 933         /*
 934          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 935          */
 936         /* FIXME: Someone please explain why this is endian-safe */
 937         opt = 1;
 938         if (np->np_network_transport == ISCSI_TCP) {
 939                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 940                                 (char *)&opt, sizeof(opt));
 941                 if (ret < 0) {
 942                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 943                                 " failed: %d\n", ret);
 944                         goto fail;
 945                 }
 946         }
 947
 948         /* FIXME: Someone please explain why this is endian-safe */
 949         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 950                         (char *)&opt, sizeof(opt));
 951         if (ret < 0) {
 952                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 953                         " failed\n");
 954                 goto fail;
 955         }
 956
 957         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 958                         (char *)&opt, sizeof(opt));
 959         if (ret < 0) {
 960                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 961                         " failed\n");
 962                 goto fail;
 963         }
 964
 965         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 966         if (ret < 0) {
 967                 pr_err("kernel_bind() failed: %d\n", ret);
 968                 goto fail;
 969         }
 970
 971         ret = kernel_listen(sock, backlog);
 972         if (ret != 0) {
 973                 pr_err("kernel_listen() failed: %d\n", ret);
 974                 goto fail;
 975         }
 976
 977         return 0;
 978 fail:
 979         np->np_socket = NULL;
 980         sock_release(sock);
 981         return ret;
 982 }
 983
 984 int iscsi_target_setup_login_socket(
 985         struct iscsi_np *np,
 986         struct sockaddr_storage *sockaddr)
 987 {
 988         struct iscsit_transport *t;
 989         int rc;
 990
 991         t = iscsit_get_transport(np->np_network_transport);
 992         if (!t)
 993                 return -EINVAL;
 994
 995         rc = t->iscsit_setup_np(np, sockaddr);
 996         if (rc < 0) {
 997                 iscsit_put_transport(t);
 998                 return rc;
 999         }
1000
1001         np->np_transport = t;
1002         np->enabled = true;
1003         return 0;
1004 }
1005
1006 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1007 {
1008         struct socket *new_sock, *sock = np->np_socket;
1009         struct sockaddr_in sock_in;
1010         struct sockaddr_in6 sock_in6;
1011         int rc, err;
1012
1013         rc = kernel_accept(sock, &new_sock, 0);
1014         if (rc < 0)
1015                 return rc;
1016
1017         conn->sock = new_sock;
1018         conn->login_family = np->np_sockaddr.ss_family;
1019
1020         if (np->np_sockaddr.ss_family == AF_INET6) {
1021                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1022
1023                 rc = conn->sock->ops->getname(conn->sock,
1024                                 (struct sockaddr *)&sock_in6, &err, 1);
1025                 if (!rc) {
1026                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1027                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1028                         } else {
1029                                 /* Pretend to be an ipv4 socket */
1030                                 sock_in.sin_family = AF_INET;
1031                                 sock_in.sin_port = sock_in6.sin6_port;
1032                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1033                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1034                         }
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                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1042                         } else {
1043                                 /* Pretend to be an ipv4 socket */
1044                                 sock_in.sin_family = AF_INET;
1045                                 sock_in.sin_port = sock_in6.sin6_port;
1046                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1047                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1048                         }
1049                 }
1050         } else {
1051                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1052
1053                 rc = conn->sock->ops->getname(conn->sock,
1054                                 (struct sockaddr *)&sock_in, &err, 1);
1055                 if (!rc)
1056                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1057
1058                 rc = conn->sock->ops->getname(conn->sock,
1059                                 (struct sockaddr *)&sock_in, &err, 0);
1060                 if (!rc)
1061                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1062         }
1063
1064         return 0;
1065 }
1066
1067 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1068 {
1069         struct iscsi_login_req *login_req;
1070         u32 padding = 0, payload_length;
1071
1072         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1073                 return -1;
1074
1075         login_req = (struct iscsi_login_req *)login->req;
1076         payload_length  = ntoh24(login_req->dlength);
1077         padding = ((-payload_length) & 3);
1078
1079         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1080                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1081                 login_req->flags, login_req->itt, login_req->cmdsn,
1082                 login_req->exp_statsn, login_req->cid, payload_length);
1083         /*
1084          * Setup the initial iscsi_login values from the leading
1085          * login request PDU.
1086          */
1087         if (login->first_request) {
1088                 login_req = (struct iscsi_login_req *)login->req;
1089                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1090                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1091                 login->version_min      = login_req->min_version;
1092                 login->version_max      = login_req->max_version;
1093                 memcpy(login->isid, login_req->isid, 6);
1094                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1095                 login->init_task_tag    = login_req->itt;
1096                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1097                 login->cid              = be16_to_cpu(login_req->cid);
1098                 login->tsih             = be16_to_cpu(login_req->tsih);
1099         }
1100
1101         if (iscsi_target_check_login_request(conn, login) < 0)
1102                 return -1;
1103
1104         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1105         if (iscsi_login_rx_data(conn, login->req_buf,
1106                                 payload_length + padding) < 0)
1107                 return -1;
1108
1109         return 0;
1110 }
1111
1112 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1113                         u32 length)
1114 {
1115         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1116                 return -1;
1117
1118         return 0;
1119 }
1120
1121 static int
1122 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1123 {
1124         int rc;
1125
1126         if (!t->owner) {
1127                 conn->conn_transport = t;
1128                 return 0;
1129         }
1130
1131         rc = try_module_get(t->owner);
1132         if (!rc) {
1133                 pr_err("try_module_get() failed for %s\n", t->name);
1134                 return -EINVAL;
1135         }
1136
1137         conn->conn_transport = t;
1138         return 0;
1139 }
1140
1141 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1142                                  bool zero_tsih, bool new_sess)
1143 {
1144         if (!new_sess)
1145                 goto old_sess_out;
1146
1147         pr_err("iSCSI Login negotiation failed.\n");
1148         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1149                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1150         if (!zero_tsih || !conn->sess)
1151                 goto old_sess_out;
1152
1153         transport_free_session(conn->sess->se_sess);
1154
1155         spin_lock_bh(&sess_idr_lock);
1156         idr_remove(&sess_idr, conn->sess->session_index);
1157         spin_unlock_bh(&sess_idr_lock);
1158
1159         kfree(conn->sess->sess_ops);
1160         kfree(conn->sess);
1161         conn->sess = NULL;
1162
1163 old_sess_out:
1164         /*
1165          * If login negotiation fails check if the Time2Retain timer
1166          * needs to be restarted.
1167          */
1168         if (!zero_tsih && conn->sess) {
1169                 spin_lock_bh(&conn->sess->conn_lock);
1170                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1171                         struct se_portal_group *se_tpg =
1172                                         &conn->tpg->tpg_se_tpg;
1173
1174                         atomic_set(&conn->sess->session_continuation, 0);
1175                         spin_unlock_bh(&conn->sess->conn_lock);
1176                         spin_lock_bh(&se_tpg->session_lock);
1177                         iscsit_start_time2retain_handler(conn->sess);
1178                         spin_unlock_bh(&se_tpg->session_lock);
1179                 } else
1180                         spin_unlock_bh(&conn->sess->conn_lock);
1181                 iscsit_dec_session_usage_count(conn->sess);
1182         }
1183
1184         if (!IS_ERR(conn->conn_rx_hash.tfm))
1185                 crypto_free_hash(conn->conn_rx_hash.tfm);
1186         if (!IS_ERR(conn->conn_tx_hash.tfm))
1187                 crypto_free_hash(conn->conn_tx_hash.tfm);
1188
1189         free_cpumask_var(conn->conn_cpumask);
1190
1191         kfree(conn->conn_ops);
1192
1193         if (conn->param_list) {
1194                 iscsi_release_param_list(conn->param_list);
1195                 conn->param_list = NULL;
1196         }
1197         iscsi_target_nego_release(conn);
1198
1199         if (conn->sock) {
1200                 sock_release(conn->sock);
1201                 conn->sock = NULL;
1202         }
1203
1204         if (conn->conn_transport->iscsit_wait_conn)
1205                 conn->conn_transport->iscsit_wait_conn(conn);
1206
1207         if (conn->conn_transport->iscsit_free_conn)
1208                 conn->conn_transport->iscsit_free_conn(conn);
1209
1210         iscsit_put_transport(conn->conn_transport);
1211         kfree(conn);
1212 }
1213
1214 static int __iscsi_target_login_thread(struct iscsi_np *np)
1215 {
1216         u8 *buffer, zero_tsih = 0;
1217         int ret = 0, rc;
1218         struct iscsi_conn *conn = NULL;
1219         struct iscsi_login *login;
1220         struct iscsi_portal_group *tpg = NULL;
1221         struct iscsi_login_req *pdu;
1222         struct iscsi_tpg_np *tpg_np;
1223         bool new_sess = false;
1224
1225         flush_signals(current);
1226
1227         spin_lock_bh(&np->np_thread_lock);
1228         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1229                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1230                 spin_unlock_bh(&np->np_thread_lock);
1231                 complete(&np->np_restart_comp);
1232                 return 1;
1233         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1234                 spin_unlock_bh(&np->np_thread_lock);
1235                 goto exit;
1236         } else {
1237                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1238         }
1239         spin_unlock_bh(&np->np_thread_lock);
1240
1241         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1242         if (!conn) {
1243                 pr_err("Could not allocate memory for"
1244                         " new connection\n");
1245                 /* Get another socket */
1246                 return 1;
1247         }
1248         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1249         conn->conn_state = TARG_CONN_STATE_FREE;
1250
1251         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1252                 kfree(conn);
1253                 return 1;
1254         }
1255
1256         rc = np->np_transport->iscsit_accept_np(np, conn);
1257         if (rc == -ENOSYS) {
1258                 complete(&np->np_restart_comp);
1259                 iscsit_put_transport(conn->conn_transport);
1260                 kfree(conn);
1261                 conn = NULL;
1262                 goto exit;
1263         } else if (rc < 0) {
1264                 spin_lock_bh(&np->np_thread_lock);
1265                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1266                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1267                         spin_unlock_bh(&np->np_thread_lock);
1268                         complete(&np->np_restart_comp);
1269                         iscsit_put_transport(conn->conn_transport);
1270                         kfree(conn);
1271                         conn = NULL;
1272                         /* Get another socket */
1273                         return 1;
1274                 }
1275                 spin_unlock_bh(&np->np_thread_lock);
1276                 iscsit_put_transport(conn->conn_transport);
1277                 kfree(conn);
1278                 conn = NULL;
1279                 goto out;
1280         }
1281         /*
1282          * Perform the remaining iSCSI connection initialization items..
1283          */
1284         login = iscsi_login_init_conn(conn);
1285         if (!login) {
1286                 goto new_sess_out;
1287         }
1288
1289         iscsi_start_login_thread_timer(np);
1290
1291         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1292         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1293         /*
1294          * This will process the first login request + payload..
1295          */
1296         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1297         if (rc == 1)
1298                 return 1;
1299         else if (rc < 0)
1300                 goto new_sess_out;
1301
1302         buffer = &login->req[0];
1303         pdu = (struct iscsi_login_req *)buffer;
1304         /*
1305          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1306          * when Status-Class != 0.
1307         */
1308         conn->login_itt = pdu->itt;
1309
1310         spin_lock_bh(&np->np_thread_lock);
1311         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1312                 spin_unlock_bh(&np->np_thread_lock);
1313                 pr_err("iSCSI Network Portal on %pISpc currently not"
1314                         " active.\n", &np->np_sockaddr);
1315                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1316                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1317                 goto new_sess_out;
1318         }
1319         spin_unlock_bh(&np->np_thread_lock);
1320
1321         conn->network_transport = np->np_network_transport;
1322
1323         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1324                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1325                 &conn->local_sockaddr);
1326
1327         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1328         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1329
1330         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1331                         pdu->min_version) < 0)
1332                 goto new_sess_out;
1333
1334         zero_tsih = (pdu->tsih == 0x0000);
1335         if (zero_tsih) {
1336                 /*
1337                  * This is the leading connection of a new session.
1338                  * We wait until after authentication to check for
1339                  * session reinstatement.
1340                  */
1341                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1342                         goto new_sess_out;
1343         } else {
1344                 /*
1345                  * Add a new connection to an existing session.
1346                  * We check for a non-existant session in
1347                  * iscsi_login_non_zero_tsih_s2() below based
1348                  * on ISID/TSIH, but wait until after authentication
1349                  * to check for connection reinstatement, etc.
1350                  */
1351                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1352                         goto new_sess_out;
1353         }
1354         /*
1355          * SessionType: Discovery
1356          *
1357          *      Locates Default Portal
1358          *
1359          * SessionType: Normal
1360          *
1361          *      Locates Target Portal from NP -> Target IQN
1362          */
1363         rc = iscsi_target_locate_portal(np, conn, login);
1364         if (rc < 0) {
1365                 tpg = conn->tpg;
1366                 goto new_sess_out;
1367         }
1368         login->zero_tsih = zero_tsih;
1369
1370         if (conn->sess)
1371                 conn->sess->se_sess->sup_prot_ops =
1372                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1373
1374         tpg = conn->tpg;
1375         if (!tpg) {
1376                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1377                 goto new_sess_out;
1378         }
1379
1380         if (zero_tsih) {
1381                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1382                         goto new_sess_out;
1383         } else {
1384                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1385                         goto old_sess_out;
1386         }
1387
1388         ret = iscsi_target_start_negotiation(login, conn);
1389         if (ret < 0)
1390                 goto new_sess_out;
1391
1392         iscsi_stop_login_thread_timer(np);
1393
1394         if (ret == 1) {
1395                 tpg_np = conn->tpg_np;
1396
1397                 iscsi_post_login_handler(np, conn, zero_tsih);
1398                 iscsit_deaccess_np(np, tpg, tpg_np);
1399         }
1400
1401         tpg = NULL;
1402         tpg_np = NULL;
1403         /* Get another socket */
1404         return 1;
1405
1406 new_sess_out:
1407         new_sess = true;
1408 old_sess_out:
1409         iscsi_stop_login_thread_timer(np);
1410         tpg_np = conn->tpg_np;
1411         iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1412         new_sess = false;
1413
1414         if (tpg) {
1415                 iscsit_deaccess_np(np, tpg, tpg_np);
1416                 tpg = NULL;
1417                 tpg_np = NULL;
1418         }
1419
1420 out:
1421         return 1;
1422
1423 exit:
1424         iscsi_stop_login_thread_timer(np);
1425         spin_lock_bh(&np->np_thread_lock);
1426         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1427         spin_unlock_bh(&np->np_thread_lock);
1428
1429         return 0;
1430 }
1431
1432 int iscsi_target_login_thread(void *arg)
1433 {
1434         struct iscsi_np *np = arg;
1435         int ret;
1436
1437         allow_signal(SIGINT);
1438
1439         while (1) {
1440                 ret = __iscsi_target_login_thread(np);
1441                 /*
1442                  * We break and exit here unless another sock_accept() call
1443                  * is expected.
1444                  */
1445                 if (ret != 1)
1446                         break;
1447         }
1448
1449         while (!kthread_should_stop()) {
1450                 msleep(100);
1451         }
1452
1453         return 0;
1454 }