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                         spin_unlock(&sess_p->conn_lock);
 199                         iscsit_inc_session_usage_count(sess_p);
 200                         iscsit_stop_time2retain_timer(sess_p);
 201                         sess = sess_p;
 202                         break;
 203                 }
 204                 spin_unlock(&sess_p->conn_lock);
 205         }
 206         spin_unlock_bh(&se_tpg->session_lock);
 207         /*
 208          * If the Time2Retain handler has expired, the session is already gone.
 209          */
 210         if (!sess)
 211                 return 0;
 212
 213         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 214                 " preforming session reinstatement.\n", (sessiontype) ?
 215                 "Discovery" : "Normal", sess->sid,
 216                 sess->sess_ops->InitiatorName);
 217
 218         spin_lock_bh(&sess->conn_lock);
 219         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 220                 spin_unlock_bh(&sess->conn_lock);
 221                 iscsit_dec_session_usage_count(sess);
 222                 target_put_session(sess->se_sess);
 223                 return 0;
 224         }
 225         spin_unlock_bh(&sess->conn_lock);
 226
 227         iscsit_stop_session(sess, 1, 1);
 228         iscsit_dec_session_usage_count(sess);
 229
 230         target_put_session(sess->se_sess);
 231         return 0;
 232 }
 233
 234 static void iscsi_login_set_conn_values(
 235         struct iscsi_session *sess,
 236         struct iscsi_conn *conn,
 237         __be16 cid)
 238 {
 239         conn->sess              = sess;
 240         conn->cid               = be16_to_cpu(cid);
 241         /*
 242          * Generate a random Status sequence number (statsn) for the new
 243          * iSCSI connection.
 244          */
 245         get_random_bytes(&conn->stat_sn, sizeof(u32));
 246
 247         mutex_lock(&auth_id_lock);
 248         conn->auth_id           = iscsit_global->auth_id++;
 249         mutex_unlock(&auth_id_lock);
 250 }
 251
 252 static __printf(2, 3) int iscsi_change_param_sprintf(
 253         struct iscsi_conn *conn,
 254         const char *fmt, ...)
 255 {
 256         va_list args;
 257         unsigned char buf[64];
 258
 259         memset(buf, 0, sizeof buf);
 260
 261         va_start(args, fmt);
 262         vsnprintf(buf, sizeof buf, fmt, args);
 263         va_end(args);
 264
 265         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 266                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 267                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 268                 return -1;
 269         }
 270
 271         return 0;
 272 }
 273
 274 /*
 275  *      This is the leading connection of a new session,
 276  *      or session reinstatement.
 277  */
 278 static int iscsi_login_zero_tsih_s1(
 279         struct iscsi_conn *conn,
 280         unsigned char *buf)
 281 {
 282         struct iscsi_session *sess = NULL;
 283         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 284         int ret;
 285
 286         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 287         if (!sess) {
 288                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 289                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 290                 pr_err("Could not allocate memory for session\n");
 291                 return -ENOMEM;
 292         }
 293
 294         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 295         sess->init_task_tag     = pdu->itt;
 296         memcpy(&sess->isid, pdu->isid, 6);
 297         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 298         INIT_LIST_HEAD(&sess->sess_conn_list);
 299         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 300         INIT_LIST_HEAD(&sess->cr_active_list);
 301         INIT_LIST_HEAD(&sess->cr_inactive_list);
 302         init_completion(&sess->async_msg_comp);
 303         init_completion(&sess->reinstatement_comp);
 304         init_completion(&sess->session_wait_comp);
 305         init_completion(&sess->session_waiting_on_uc_comp);
 306         mutex_init(&sess->cmdsn_mutex);
 307         spin_lock_init(&sess->conn_lock);
 308         spin_lock_init(&sess->cr_a_lock);
 309         spin_lock_init(&sess->cr_i_lock);
 310         spin_lock_init(&sess->session_usage_lock);
 311         spin_lock_init(&sess->ttt_lock);
 312
 313         idr_preload(GFP_KERNEL);
 314         spin_lock_bh(&sess_idr_lock);
 315         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 316         if (ret >= 0)
 317                 sess->session_index = ret;
 318         spin_unlock_bh(&sess_idr_lock);
 319         idr_preload_end();
 320
 321         if (ret < 0) {
 322                 pr_err("idr_alloc() for sess_idr failed\n");
 323                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 324                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 325                 kfree(sess);
 326                 return -ENOMEM;
 327         }
 328
 329         sess->creation_time = get_jiffies_64();
 330         /*
 331          * The FFP CmdSN window values will be allocated from the TPG's
 332          * Initiator Node's ACL once the login has been successfully completed.
 333          */
 334         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                 kfree(sess);
 343                 return -ENOMEM;
 344         }
 345
 346         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 347         if (IS_ERR(sess->se_sess)) {
 348                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 349                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 350                 kfree(sess->sess_ops);
 351                 kfree(sess);
 352                 return -ENOMEM;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int iscsi_login_zero_tsih_s2(
 359         struct iscsi_conn *conn)
 360 {
 361         struct iscsi_node_attrib *na;
 362         struct iscsi_session *sess = conn->sess;
 363         bool iser = false;
 364
 365         sess->tpg = conn->tpg;
 366
 367         /*
 368          * Assign a new TPG Session Handle.  Note this is protected with
 369          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 370          */
 371         sess->tsih = ++sess->tpg->ntsih;
 372         if (!sess->tsih)
 373                 sess->tsih = ++sess->tpg->ntsih;
 374
 375         /*
 376          * Create the default params from user defined values..
 377          */
 378         if (iscsi_copy_param_list(&conn->param_list,
 379                                 conn->tpg->param_list, 1) < 0) {
 380                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 381                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 382                 return -1;
 383         }
 384
 385         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 386                 iser = true;
 387
 388         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 389
 390         if (sess->sess_ops->SessionType)
 391                 return iscsi_set_keys_irrelevant_for_discovery(
 392                                 conn->param_list);
 393
 394         na = iscsit_tpg_get_node_attrib(sess);
 395
 396         /*
 397          * Need to send TargetPortalGroupTag back in first login response
 398          * on any iSCSI connection where the Initiator provides TargetName.
 399          * See 5.3.1.  Login Phase Start
 400          *
 401          * In our case, we have already located the struct iscsi_tiqn at this point.
 402          */
 403         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 404                 return -1;
 405
 406         /*
 407          * Workaround for Initiators that have broken connection recovery logic.
 408          *
 409          * "We would really like to get rid of this." Linux-iSCSI.org team
 410          */
 411         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 412                 return -1;
 413
 414         /*
 415          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 416          */
 417         if (iser) {
 418                 struct iscsi_param *param;
 419                 unsigned long mrdsl, off;
 420                 int rc;
 421
 422                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 423                         return -1;
 424
 425                 /*
 426                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 427                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 428                  */
 429                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 430                                                   conn->param_list);
 431                 if (!param) {
 432                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 433                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 434                         return -1;
 435                 }
 436                 rc = kstrtoul(param->value, 0, &mrdsl);
 437                 if (rc < 0) {
 438                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 439                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 440                         return -1;
 441                 }
 442                 off = mrdsl % PAGE_SIZE;
 443                 if (!off)
 444                         goto check_prot;
 445
 446                 if (mrdsl < PAGE_SIZE)
 447                         mrdsl = PAGE_SIZE;
 448                 else
 449                         mrdsl -= off;
 450
 451                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 452                         " to PAGE_SIZE\n", mrdsl);
 453
 454                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 455                         return -1;
 456                 /*
 457                  * ISER currently requires that ImmediateData + Unsolicited
 458                  * Data be disabled when protection / signature MRs are enabled.
 459                  */
 460 check_prot:
 461                 if (sess->se_sess->sup_prot_ops &
 462                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 463                     TARGET_PROT_DOUT_INSERT)) {
 464
 465                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 466                                 return -1;
 467
 468                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 469                                 return -1;
 470
 471                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 472                                  " T10-PI enabled ISER session\n");
 473                 }
 474         }
 475
 476         return 0;
 477 }
 478
 479 static int iscsi_login_non_zero_tsih_s1(
 480         struct iscsi_conn *conn,
 481         unsigned char *buf)
 482 {
 483         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 484
 485         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 486         return 0;
 487 }
 488
 489 /*
 490  *      Add a new connection to an existing session.
 491  */
 492 static int iscsi_login_non_zero_tsih_s2(
 493         struct iscsi_conn *conn,
 494         unsigned char *buf)
 495 {
 496         struct iscsi_portal_group *tpg = conn->tpg;
 497         struct iscsi_session *sess = NULL, *sess_p = NULL;
 498         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 499         struct se_session *se_sess, *se_sess_tmp;
 500         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 501         bool iser = false;
 502
 503         spin_lock_bh(&se_tpg->session_lock);
 504         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 505                         sess_list) {
 506
 507                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 508                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 509                     atomic_read(&sess_p->session_logout) ||
 510                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 511                         continue;
 512                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 513                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 514                         iscsit_inc_session_usage_count(sess_p);
 515                         iscsit_stop_time2retain_timer(sess_p);
 516                         sess = sess_p;
 517                         break;
 518                 }
 519         }
 520         spin_unlock_bh(&se_tpg->session_lock);
 521
 522         /*
 523          * If the Time2Retain handler has expired, the session is already gone.
 524          */
 525         if (!sess) {
 526                 pr_err("Initiator attempting to add a connection to"
 527                         " a non-existent session, rejecting iSCSI Login.\n");
 528                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 529                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 530                 return -1;
 531         }
 532
 533         /*
 534          * Stop the Time2Retain timer if this is a failed session, we restart
 535          * the timer if the login is not successful.
 536          */
 537         spin_lock_bh(&sess->conn_lock);
 538         if (sess->session_state == TARG_SESS_STATE_FAILED)
 539                 atomic_set(&sess->session_continuation, 1);
 540         spin_unlock_bh(&sess->conn_lock);
 541
 542         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 543
 544         if (iscsi_copy_param_list(&conn->param_list,
 545                         conn->tpg->param_list, 0) < 0) {
 546                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 547                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 548                 return -1;
 549         }
 550
 551         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 552                 iser = true;
 553
 554         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 555         /*
 556          * Need to send TargetPortalGroupTag back in first login response
 557          * on any iSCSI connection where the Initiator provides TargetName.
 558          * See 5.3.1.  Login Phase Start
 559          *
 560          * In our case, we have already located the struct iscsi_tiqn at this point.
 561          */
 562         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 563                 return -1;
 564
 565         return 0;
 566 }
 567
 568 int iscsi_login_post_auth_non_zero_tsih(
 569         struct iscsi_conn *conn,
 570         u16 cid,
 571         u32 exp_statsn)
 572 {
 573         struct iscsi_conn *conn_ptr = NULL;
 574         struct iscsi_conn_recovery *cr = NULL;
 575         struct iscsi_session *sess = conn->sess;
 576
 577         /*
 578          * By following item 5 in the login table,  if we have found
 579          * an existing ISID and a valid/existing TSIH and an existing
 580          * CID we do connection reinstatement.  Currently we dont not
 581          * support it so we send back an non-zero status class to the
 582          * initiator and release the new connection.
 583          */
 584         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 585         if (conn_ptr) {
 586                 pr_err("Connection exists with CID %hu for %s,"
 587                         " performing connection reinstatement.\n",
 588                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 589
 590                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 591                 iscsit_dec_conn_usage_count(conn_ptr);
 592         }
 593
 594         /*
 595          * Check for any connection recovery entires containing CID.
 596          * We use the original ExpStatSN sent in the first login request
 597          * to acknowledge commands for the failed connection.
 598          *
 599          * Also note that an explict logout may have already been sent,
 600          * but the response may not be sent due to additional connection
 601          * loss.
 602          */
 603         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 604                 cr = iscsit_get_inactive_connection_recovery_entry(
 605                                 sess, cid);
 606                 if (cr) {
 607                         pr_debug("Performing implicit logout"
 608                                 " for connection recovery on CID: %hu\n",
 609                                         conn->cid);
 610                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 611                 }
 612         }
 613
 614         /*
 615          * Else we follow item 4 from the login table in that we have
 616          * found an existing ISID and a valid/existing TSIH and a new
 617          * CID we go ahead and continue to add a new connection to the
 618          * session.
 619          */
 620         pr_debug("Adding CID %hu to existing session for %s.\n",
 621                         cid, sess->sess_ops->InitiatorName);
 622
 623         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 624                 pr_err("Adding additional connection to this session"
 625                         " would exceed MaxConnections %d, login failed.\n",
 626                                 sess->sess_ops->MaxConnections);
 627                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 628                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 636 {
 637         struct iscsi_session *sess = conn->sess;
 638         /*
 639          * FIXME: Unsolicitied NopIN support for ISER
 640          */
 641         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 642                 return;
 643
 644         if (!sess->sess_ops->SessionType)
 645                 iscsit_start_nopin_timer(conn);
 646 }
 647
 648 int iscsit_start_kthreads(struct iscsi_conn *conn)
 649 {
 650         int ret = 0;
 651
 652         spin_lock(&iscsit_global->ts_bitmap_lock);
 653         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 654                                         ISCSIT_BITMAP_BITS, get_order(1));
 655         spin_unlock(&iscsit_global->ts_bitmap_lock);
 656
 657         if (conn->bitmap_id < 0) {
 658                 pr_err("bitmap_find_free_region() failed for"
 659                        " iscsit_start_kthreads()\n");
 660                 return -ENOMEM;
 661         }
 662
 663         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 664                                       "%s", ISCSI_TX_THREAD_NAME);
 665         if (IS_ERR(conn->tx_thread)) {
 666                 pr_err("Unable to start iscsi_target_tx_thread\n");
 667                 ret = PTR_ERR(conn->tx_thread);
 668                 goto out_bitmap;
 669         }
 670         conn->tx_thread_active = true;
 671
 672         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 673                                       "%s", ISCSI_RX_THREAD_NAME);
 674         if (IS_ERR(conn->rx_thread)) {
 675                 pr_err("Unable to start iscsi_target_rx_thread\n");
 676                 ret = PTR_ERR(conn->rx_thread);
 677                 goto out_tx;
 678         }
 679         conn->rx_thread_active = true;
 680
 681         return 0;
 682 out_tx:
 683         send_sig(SIGINT, conn->tx_thread, 1);
 684         kthread_stop(conn->tx_thread);
 685         conn->tx_thread_active = false;
 686 out_bitmap:
 687         spin_lock(&iscsit_global->ts_bitmap_lock);
 688         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 689                               get_order(1));
 690         spin_unlock(&iscsit_global->ts_bitmap_lock);
 691         return ret;
 692 }
 693
 694 void iscsi_post_login_handler(
 695         struct iscsi_np *np,
 696         struct iscsi_conn *conn,
 697         u8 zero_tsih)
 698 {
 699         int stop_timer = 0;
 700         struct iscsi_session *sess = conn->sess;
 701         struct se_session *se_sess = sess->se_sess;
 702         struct iscsi_portal_group *tpg = sess->tpg;
 703         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 704
 705         iscsit_inc_conn_usage_count(conn);
 706
 707         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 708                         ISCSI_LOGIN_STATUS_ACCEPT);
 709
 710         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 711         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 712
 713         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 714         /*
 715          * SCSI Initiator -> SCSI Target Port Mapping
 716          */
 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 %pISpc to"
 733                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 734                         &conn->local_sockaddr, 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                  * Determine CPU mask to ensure connection's RX and TX kthreads
 746                  * are scheduled on the same CPU.
 747                  */
 748                 iscsit_thread_get_cpumask(conn);
 749                 conn->conn_rx_reset_cpumask = 1;
 750                 conn->conn_tx_reset_cpumask = 1;
 751                 /*
 752                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 753                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 754                  */
 755                 complete(&conn->rx_login_comp);
 756                 iscsit_dec_conn_usage_count(conn);
 757
 758                 if (stop_timer) {
 759                         spin_lock_bh(&se_tpg->session_lock);
 760                         iscsit_stop_time2retain_timer(sess);
 761                         spin_unlock_bh(&se_tpg->session_lock);
 762                 }
 763                 iscsit_dec_session_usage_count(sess);
 764                 return;
 765         }
 766
 767         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 768         iscsi_release_param_list(conn->param_list);
 769         conn->param_list = NULL;
 770
 771         iscsit_determine_maxcmdsn(sess);
 772
 773         spin_lock_bh(&se_tpg->session_lock);
 774         __transport_register_session(&sess->tpg->tpg_se_tpg,
 775                         se_sess->se_node_acl, se_sess, sess);
 776         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 777         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 778
 779         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 780                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 781                 tpg->tpgt);
 782
 783         spin_lock_bh(&sess->conn_lock);
 784         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 785         atomic_inc(&sess->nconn);
 786         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 787                 " %s\n", atomic_read(&sess->nconn),
 788                 sess->sess_ops->InitiatorName);
 789         spin_unlock_bh(&sess->conn_lock);
 790
 791         sess->sid = tpg->sid++;
 792         if (!sess->sid)
 793                 sess->sid = tpg->sid++;
 794         pr_debug("Established iSCSI session from node: %s\n",
 795                         sess->sess_ops->InitiatorName);
 796
 797         tpg->nsessions++;
 798         if (tpg->tpg_tiqn)
 799                 tpg->tpg_tiqn->tiqn_nsessions++;
 800
 801         pr_debug("Incremented number of active iSCSI sessions to %u on"
 802                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 803         spin_unlock_bh(&se_tpg->session_lock);
 804
 805         iscsi_post_login_start_timers(conn);
 806         /*
 807          * Determine CPU mask to ensure connection's RX and TX kthreads
 808          * are scheduled on the same CPU.
 809          */
 810         iscsit_thread_get_cpumask(conn);
 811         conn->conn_rx_reset_cpumask = 1;
 812         conn->conn_tx_reset_cpumask = 1;
 813         /*
 814          * Wakeup the sleeping iscsi_target_rx_thread() now that
 815          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 816          */
 817         complete(&conn->rx_login_comp);
 818         iscsit_dec_conn_usage_count(conn);
 819 }
 820
 821 static void iscsi_handle_login_thread_timeout(unsigned long data)
 822 {
 823         struct iscsi_np *np = (struct iscsi_np *) data;
 824
 825         spin_lock_bh(&np->np_thread_lock);
 826         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 827                         &np->np_sockaddr);
 828
 829         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 830                 spin_unlock_bh(&np->np_thread_lock);
 831                 return;
 832         }
 833
 834         if (np->np_thread)
 835                 send_sig(SIGINT, np->np_thread, 1);
 836
 837         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 838         spin_unlock_bh(&np->np_thread_lock);
 839 }
 840
 841 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 842 {
 843         /*
 844          * This used the TA_LOGIN_TIMEOUT constant because at this
 845          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 846          */
 847         spin_lock_bh(&np->np_thread_lock);
 848         init_timer(&np->np_login_timer);
 849         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 850         np->np_login_timer.data = (unsigned long)np;
 851         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 852         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 853         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 854         add_timer(&np->np_login_timer);
 855
 856         pr_debug("Added timeout timer to iSCSI login request for"
 857                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 858         spin_unlock_bh(&np->np_thread_lock);
 859 }
 860
 861 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 862 {
 863         spin_lock_bh(&np->np_thread_lock);
 864         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 865                 spin_unlock_bh(&np->np_thread_lock);
 866                 return;
 867         }
 868         np->np_login_timer_flags |= ISCSI_TF_STOP;
 869         spin_unlock_bh(&np->np_thread_lock);
 870
 871         del_timer_sync(&np->np_login_timer);
 872
 873         spin_lock_bh(&np->np_thread_lock);
 874         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 875         spin_unlock_bh(&np->np_thread_lock);
 876 }
 877
 878 int iscsit_setup_np(
 879         struct iscsi_np *np,
 880         struct sockaddr_storage *sockaddr)
 881 {
 882         struct socket *sock = NULL;
 883         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 884
 885         switch (np->np_network_transport) {
 886         case ISCSI_TCP:
 887                 np->np_ip_proto = IPPROTO_TCP;
 888                 np->np_sock_type = SOCK_STREAM;
 889                 break;
 890         case ISCSI_SCTP_TCP:
 891                 np->np_ip_proto = IPPROTO_SCTP;
 892                 np->np_sock_type = SOCK_STREAM;
 893                 break;
 894         case ISCSI_SCTP_UDP:
 895                 np->np_ip_proto = IPPROTO_SCTP;
 896                 np->np_sock_type = SOCK_SEQPACKET;
 897                 break;
 898         default:
 899                 pr_err("Unsupported network_transport: %d\n",
 900                                 np->np_network_transport);
 901                 return -EINVAL;
 902         }
 903
 904         np->np_ip_proto = IPPROTO_TCP;
 905         np->np_sock_type = SOCK_STREAM;
 906
 907         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 908                         np->np_ip_proto, &sock);
 909         if (ret < 0) {
 910                 pr_err("sock_create() failed.\n");
 911                 return ret;
 912         }
 913         np->np_socket = sock;
 914         /*
 915          * Setup the np->np_sockaddr from the passed sockaddr setup
 916          * in iscsi_target_configfs.c code..
 917          */
 918         memcpy(&np->np_sockaddr, sockaddr,
 919                         sizeof(struct sockaddr_storage));
 920
 921         if (sockaddr->ss_family == AF_INET6)
 922                 len = sizeof(struct sockaddr_in6);
 923         else
 924                 len = sizeof(struct sockaddr_in);
 925         /*
 926          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 927          */
 928         /* FIXME: Someone please explain why this is endian-safe */
 929         opt = 1;
 930         if (np->np_network_transport == ISCSI_TCP) {
 931                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 932                                 (char *)&opt, sizeof(opt));
 933                 if (ret < 0) {
 934                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 935                                 " failed: %d\n", ret);
 936                         goto fail;
 937                 }
 938         }
 939
 940         /* FIXME: Someone please explain why this is endian-safe */
 941         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 942                         (char *)&opt, sizeof(opt));
 943         if (ret < 0) {
 944                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 945                         " failed\n");
 946                 goto fail;
 947         }
 948
 949         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 950                         (char *)&opt, sizeof(opt));
 951         if (ret < 0) {
 952                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 953                         " failed\n");
 954                 goto fail;
 955         }
 956
 957         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 958         if (ret < 0) {
 959                 pr_err("kernel_bind() failed: %d\n", ret);
 960                 goto fail;
 961         }
 962
 963         ret = kernel_listen(sock, backlog);
 964         if (ret != 0) {
 965                 pr_err("kernel_listen() failed: %d\n", ret);
 966                 goto fail;
 967         }
 968
 969         return 0;
 970 fail:
 971         np->np_socket = NULL;
 972         sock_release(sock);
 973         return ret;
 974 }
 975
 976 int iscsi_target_setup_login_socket(
 977         struct iscsi_np *np,
 978         struct sockaddr_storage *sockaddr)
 979 {
 980         struct iscsit_transport *t;
 981         int rc;
 982
 983         t = iscsit_get_transport(np->np_network_transport);
 984         if (!t)
 985                 return -EINVAL;
 986
 987         rc = t->iscsit_setup_np(np, sockaddr);
 988         if (rc < 0) {
 989                 iscsit_put_transport(t);
 990                 return rc;
 991         }
 992
 993         np->np_transport = t;
 994         np->enabled = true;
 995         return 0;
 996 }
 997
 998 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 999 {
1000         struct socket *new_sock, *sock = np->np_socket;
1001         struct sockaddr_in sock_in;
1002         struct sockaddr_in6 sock_in6;
1003         int rc, err;
1004
1005         rc = kernel_accept(sock, &new_sock, 0);
1006         if (rc < 0)
1007                 return rc;
1008
1009         conn->sock = new_sock;
1010         conn->login_family = np->np_sockaddr.ss_family;
1011
1012         if (np->np_sockaddr.ss_family == AF_INET6) {
1013                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1014
1015                 rc = conn->sock->ops->getname(conn->sock,
1016                                 (struct sockaddr *)&sock_in6, &err, 1);
1017                 if (!rc) {
1018                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1019                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1020                         } else {
1021                                 /* Pretend to be an ipv4 socket */
1022                                 sock_in.sin_family = AF_INET;
1023                                 sock_in.sin_port = sock_in6.sin6_port;
1024                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1025                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1026                         }
1027                 }
1028
1029                 rc = conn->sock->ops->getname(conn->sock,
1030                                 (struct sockaddr *)&sock_in6, &err, 0);
1031                 if (!rc) {
1032                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1033                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1034                         } else {
1035                                 /* Pretend to be an ipv4 socket */
1036                                 sock_in.sin_family = AF_INET;
1037                                 sock_in.sin_port = sock_in6.sin6_port;
1038                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1039                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1040                         }
1041                 }
1042         } else {
1043                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1044
1045                 rc = conn->sock->ops->getname(conn->sock,
1046                                 (struct sockaddr *)&sock_in, &err, 1);
1047                 if (!rc)
1048                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1049
1050                 rc = conn->sock->ops->getname(conn->sock,
1051                                 (struct sockaddr *)&sock_in, &err, 0);
1052                 if (!rc)
1053                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1054         }
1055
1056         return 0;
1057 }
1058
1059 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1060 {
1061         struct iscsi_login_req *login_req;
1062         u32 padding = 0, payload_length;
1063
1064         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1065                 return -1;
1066
1067         login_req = (struct iscsi_login_req *)login->req;
1068         payload_length  = ntoh24(login_req->dlength);
1069         padding = ((-payload_length) & 3);
1070
1071         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1072                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1073                 login_req->flags, login_req->itt, login_req->cmdsn,
1074                 login_req->exp_statsn, login_req->cid, payload_length);
1075         /*
1076          * Setup the initial iscsi_login values from the leading
1077          * login request PDU.
1078          */
1079         if (login->first_request) {
1080                 login_req = (struct iscsi_login_req *)login->req;
1081                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1082                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1083                 login->version_min      = login_req->min_version;
1084                 login->version_max      = login_req->max_version;
1085                 memcpy(login->isid, login_req->isid, 6);
1086                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1087                 login->init_task_tag    = login_req->itt;
1088                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1089                 login->cid              = be16_to_cpu(login_req->cid);
1090                 login->tsih             = be16_to_cpu(login_req->tsih);
1091         }
1092
1093         if (iscsi_target_check_login_request(conn, login) < 0)
1094                 return -1;
1095
1096         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1097         if (iscsi_login_rx_data(conn, login->req_buf,
1098                                 payload_length + padding) < 0)
1099                 return -1;
1100
1101         return 0;
1102 }
1103
1104 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1105                         u32 length)
1106 {
1107         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1108                 return -1;
1109
1110         return 0;
1111 }
1112
1113 static int
1114 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1115 {
1116         int rc;
1117
1118         if (!t->owner) {
1119                 conn->conn_transport = t;
1120                 return 0;
1121         }
1122
1123         rc = try_module_get(t->owner);
1124         if (!rc) {
1125                 pr_err("try_module_get() failed for %s\n", t->name);
1126                 return -EINVAL;
1127         }
1128
1129         conn->conn_transport = t;
1130         return 0;
1131 }
1132
1133 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1134                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1135 {
1136         if (!new_sess)
1137                 goto old_sess_out;
1138
1139         pr_err("iSCSI Login negotiation failed.\n");
1140         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1141                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1142         if (!zero_tsih || !conn->sess)
1143                 goto old_sess_out;
1144         if (conn->sess->se_sess)
1145                 transport_free_session(conn->sess->se_sess);
1146         if (conn->sess->session_index != 0) {
1147                 spin_lock_bh(&sess_idr_lock);
1148                 idr_remove(&sess_idr, conn->sess->session_index);
1149                 spin_unlock_bh(&sess_idr_lock);
1150         }
1151         kfree(conn->sess->sess_ops);
1152         kfree(conn->sess);
1153         conn->sess = NULL;
1154
1155 old_sess_out:
1156         iscsi_stop_login_thread_timer(np);
1157         /*
1158          * If login negotiation fails check if the Time2Retain timer
1159          * needs to be restarted.
1160          */
1161         if (!zero_tsih && conn->sess) {
1162                 spin_lock_bh(&conn->sess->conn_lock);
1163                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1164                         struct se_portal_group *se_tpg =
1165                                         &conn->tpg->tpg_se_tpg;
1166
1167                         atomic_set(&conn->sess->session_continuation, 0);
1168                         spin_unlock_bh(&conn->sess->conn_lock);
1169                         spin_lock_bh(&se_tpg->session_lock);
1170                         iscsit_start_time2retain_handler(conn->sess);
1171                         spin_unlock_bh(&se_tpg->session_lock);
1172                 } else
1173                         spin_unlock_bh(&conn->sess->conn_lock);
1174                 iscsit_dec_session_usage_count(conn->sess);
1175         }
1176
1177         if (!IS_ERR(conn->conn_rx_hash.tfm))
1178                 crypto_free_hash(conn->conn_rx_hash.tfm);
1179         if (!IS_ERR(conn->conn_tx_hash.tfm))
1180                 crypto_free_hash(conn->conn_tx_hash.tfm);
1181
1182         free_cpumask_var(conn->conn_cpumask);
1183
1184         kfree(conn->conn_ops);
1185
1186         if (conn->param_list) {
1187                 iscsi_release_param_list(conn->param_list);
1188                 conn->param_list = NULL;
1189         }
1190         iscsi_target_nego_release(conn);
1191
1192         if (conn->sock) {
1193                 sock_release(conn->sock);
1194                 conn->sock = NULL;
1195         }
1196
1197         if (conn->conn_transport->iscsit_wait_conn)
1198                 conn->conn_transport->iscsit_wait_conn(conn);
1199
1200         if (conn->conn_transport->iscsit_free_conn)
1201                 conn->conn_transport->iscsit_free_conn(conn);
1202
1203         iscsit_put_transport(conn->conn_transport);
1204         kfree(conn);
1205 }
1206
1207 static int __iscsi_target_login_thread(struct iscsi_np *np)
1208 {
1209         u8 *buffer, zero_tsih = 0;
1210         int ret = 0, rc;
1211         struct iscsi_conn *conn = NULL;
1212         struct iscsi_login *login;
1213         struct iscsi_portal_group *tpg = NULL;
1214         struct iscsi_login_req *pdu;
1215         struct iscsi_tpg_np *tpg_np;
1216         bool new_sess = false;
1217
1218         flush_signals(current);
1219
1220         spin_lock_bh(&np->np_thread_lock);
1221         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1222                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1223                 complete(&np->np_restart_comp);
1224         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1225                 spin_unlock_bh(&np->np_thread_lock);
1226                 goto exit;
1227         } else {
1228                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1229         }
1230         spin_unlock_bh(&np->np_thread_lock);
1231
1232         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1233         if (!conn) {
1234                 pr_err("Could not allocate memory for"
1235                         " new connection\n");
1236                 /* Get another socket */
1237                 return 1;
1238         }
1239         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1240         conn->conn_state = TARG_CONN_STATE_FREE;
1241
1242         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1243                 kfree(conn);
1244                 return 1;
1245         }
1246
1247         rc = np->np_transport->iscsit_accept_np(np, conn);
1248         if (rc == -ENOSYS) {
1249                 complete(&np->np_restart_comp);
1250                 iscsit_put_transport(conn->conn_transport);
1251                 kfree(conn);
1252                 conn = NULL;
1253                 goto exit;
1254         } else if (rc < 0) {
1255                 spin_lock_bh(&np->np_thread_lock);
1256                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1257                         spin_unlock_bh(&np->np_thread_lock);
1258                         complete(&np->np_restart_comp);
1259                         iscsit_put_transport(conn->conn_transport);
1260                         kfree(conn);
1261                         conn = NULL;
1262                         /* Get another socket */
1263                         return 1;
1264                 }
1265                 spin_unlock_bh(&np->np_thread_lock);
1266                 iscsit_put_transport(conn->conn_transport);
1267                 kfree(conn);
1268                 conn = NULL;
1269                 goto out;
1270         }
1271         /*
1272          * Perform the remaining iSCSI connection initialization items..
1273          */
1274         login = iscsi_login_init_conn(conn);
1275         if (!login) {
1276                 goto new_sess_out;
1277         }
1278
1279         iscsi_start_login_thread_timer(np);
1280
1281         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1282         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1283         /*
1284          * This will process the first login request + payload..
1285          */
1286         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1287         if (rc == 1)
1288                 return 1;
1289         else if (rc < 0)
1290                 goto new_sess_out;
1291
1292         buffer = &login->req[0];
1293         pdu = (struct iscsi_login_req *)buffer;
1294         /*
1295          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1296          * when Status-Class != 0.
1297         */
1298         conn->login_itt = pdu->itt;
1299
1300         spin_lock_bh(&np->np_thread_lock);
1301         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1302                 spin_unlock_bh(&np->np_thread_lock);
1303                 pr_err("iSCSI Network Portal on %pISpc currently not"
1304                         " active.\n", &np->np_sockaddr);
1305                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1306                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1307                 goto new_sess_out;
1308         }
1309         spin_unlock_bh(&np->np_thread_lock);
1310
1311         conn->network_transport = np->np_network_transport;
1312
1313         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1314                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1315                 &conn->local_sockaddr);
1316
1317         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1318         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1319
1320         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1321                         pdu->min_version) < 0)
1322                 goto new_sess_out;
1323
1324         zero_tsih = (pdu->tsih == 0x0000);
1325         if (zero_tsih) {
1326                 /*
1327                  * This is the leading connection of a new session.
1328                  * We wait until after authentication to check for
1329                  * session reinstatement.
1330                  */
1331                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1332                         goto new_sess_out;
1333         } else {
1334                 /*
1335                  * Add a new connection to an existing session.
1336                  * We check for a non-existant session in
1337                  * iscsi_login_non_zero_tsih_s2() below based
1338                  * on ISID/TSIH, but wait until after authentication
1339                  * to check for connection reinstatement, etc.
1340                  */
1341                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1342                         goto new_sess_out;
1343         }
1344         /*
1345          * SessionType: Discovery
1346          *
1347          *      Locates Default Portal
1348          *
1349          * SessionType: Normal
1350          *
1351          *      Locates Target Portal from NP -> Target IQN
1352          */
1353         rc = iscsi_target_locate_portal(np, conn, login);
1354         if (rc < 0) {
1355                 tpg = conn->tpg;
1356                 goto new_sess_out;
1357         }
1358         login->zero_tsih = zero_tsih;
1359
1360         conn->sess->se_sess->sup_prot_ops =
1361                 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1362
1363         tpg = conn->tpg;
1364         if (!tpg) {
1365                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1366                 goto new_sess_out;
1367         }
1368
1369         if (zero_tsih) {
1370                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1371                         goto new_sess_out;
1372         } else {
1373                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1374                         goto old_sess_out;
1375         }
1376
1377         ret = iscsi_target_start_negotiation(login, conn);
1378         if (ret < 0)
1379                 goto new_sess_out;
1380
1381         iscsi_stop_login_thread_timer(np);
1382
1383         if (ret == 1) {
1384                 tpg_np = conn->tpg_np;
1385
1386                 iscsi_post_login_handler(np, conn, zero_tsih);
1387                 iscsit_deaccess_np(np, tpg, tpg_np);
1388         }
1389
1390         tpg = NULL;
1391         tpg_np = NULL;
1392         /* Get another socket */
1393         return 1;
1394
1395 new_sess_out:
1396         new_sess = true;
1397 old_sess_out:
1398         tpg_np = conn->tpg_np;
1399         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1400         new_sess = false;
1401
1402         if (tpg) {
1403                 iscsit_deaccess_np(np, tpg, tpg_np);
1404                 tpg = NULL;
1405                 tpg_np = NULL;
1406         }
1407
1408 out:
1409         return 1;
1410
1411 exit:
1412         iscsi_stop_login_thread_timer(np);
1413         spin_lock_bh(&np->np_thread_lock);
1414         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1415         spin_unlock_bh(&np->np_thread_lock);
1416
1417         return 0;
1418 }
1419
1420 int iscsi_target_login_thread(void *arg)
1421 {
1422         struct iscsi_np *np = arg;
1423         int ret;
1424
1425         allow_signal(SIGINT);
1426
1427         while (1) {
1428                 ret = __iscsi_target_login_thread(np);
1429                 /*
1430                  * We break and exit here unless another sock_accept() call
1431                  * is expected.
1432                  */
1433                 if (ret != 1)
1434                         break;
1435         }
1436
1437         return 0;
1438 }