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 <crypto/hash.h>
  20 #include <linux/string.h>
  21 #include <linux/kthread.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         struct crypto_ahash *tfm;
 119
 120         /*
 121          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 122          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 123          * to software 1x8 byte slicing from crc32c.ko
 124          */
 125         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
 126         if (IS_ERR(tfm)) {
 127                 pr_err("crypto_alloc_ahash() failed\n");
 128                 return -ENOMEM;
 129         }
 130
 131         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 132         if (!conn->conn_rx_hash) {
 133                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
 134                 crypto_free_ahash(tfm);
 135                 return -ENOMEM;
 136         }
 137         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
 138
 139         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 140         if (!conn->conn_tx_hash) {
 141                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 142                 ahash_request_free(conn->conn_rx_hash);
 143                 conn->conn_rx_hash = NULL;
 144                 crypto_free_ahash(tfm);
 145                 return -ENOMEM;
 146         }
 147         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 148
 149         return 0;
 150 }
 151
 152 static int iscsi_login_check_initiator_version(
 153         struct iscsi_conn *conn,
 154         u8 version_max,
 155         u8 version_min)
 156 {
 157         if ((version_max != 0x00) || (version_min != 0x00)) {
 158                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 159                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 160                         version_min, version_max);
 161                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 162                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 163                 return -1;
 164         }
 165
 166         return 0;
 167 }
 168
 169 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 170 {
 171         int sessiontype;
 172         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 173         struct iscsi_portal_group *tpg = conn->tpg;
 174         struct iscsi_session *sess = NULL, *sess_p = NULL;
 175         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 176         struct se_session *se_sess, *se_sess_tmp;
 177
 178         initiatorname_param = iscsi_find_param_from_key(
 179                         INITIATORNAME, conn->param_list);
 180         sessiontype_param = iscsi_find_param_from_key(
 181                         SESSIONTYPE, conn->param_list);
 182         if (!initiatorname_param || !sessiontype_param) {
 183                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 184                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 185                 return -1;
 186         }
 187
 188         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 189
 190         spin_lock_bh(&se_tpg->session_lock);
 191         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 192                         sess_list) {
 193
 194                 sess_p = se_sess->fabric_sess_ptr;
 195                 spin_lock(&sess_p->conn_lock);
 196                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 197                     atomic_read(&sess_p->session_logout) ||
 198                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 199                         spin_unlock(&sess_p->conn_lock);
 200                         continue;
 201                 }
 202                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 203                    (!strcmp(sess_p->sess_ops->InitiatorName,
 204                             initiatorname_param->value) &&
 205                    (sess_p->sess_ops->SessionType == sessiontype))) {
 206                         atomic_set(&sess_p->session_reinstatement, 1);
 207                         spin_unlock(&sess_p->conn_lock);
 208                         iscsit_inc_session_usage_count(sess_p);
 209                         iscsit_stop_time2retain_timer(sess_p);
 210                         sess = sess_p;
 211                         break;
 212                 }
 213                 spin_unlock(&sess_p->conn_lock);
 214         }
 215         spin_unlock_bh(&se_tpg->session_lock);
 216         /*
 217          * If the Time2Retain handler has expired, the session is already gone.
 218          */
 219         if (!sess)
 220                 return 0;
 221
 222         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 223                 " preforming session reinstatement.\n", (sessiontype) ?
 224                 "Discovery" : "Normal", sess->sid,
 225                 sess->sess_ops->InitiatorName);
 226
 227         spin_lock_bh(&sess->conn_lock);
 228         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 229                 spin_unlock_bh(&sess->conn_lock);
 230                 iscsit_dec_session_usage_count(sess);
 231                 target_put_session(sess->se_sess);
 232                 return 0;
 233         }
 234         spin_unlock_bh(&sess->conn_lock);
 235
 236         iscsit_stop_session(sess, 1, 1);
 237         iscsit_dec_session_usage_count(sess);
 238
 239         target_put_session(sess->se_sess);
 240         return 0;
 241 }
 242
 243 static void iscsi_login_set_conn_values(
 244         struct iscsi_session *sess,
 245         struct iscsi_conn *conn,
 246         __be16 cid)
 247 {
 248         conn->sess              = sess;
 249         conn->cid               = be16_to_cpu(cid);
 250         /*
 251          * Generate a random Status sequence number (statsn) for the new
 252          * iSCSI connection.
 253          */
 254         get_random_bytes(&conn->stat_sn, sizeof(u32));
 255
 256         mutex_lock(&auth_id_lock);
 257         conn->auth_id           = iscsit_global->auth_id++;
 258         mutex_unlock(&auth_id_lock);
 259 }
 260
 261 static __printf(2, 3) int iscsi_change_param_sprintf(
 262         struct iscsi_conn *conn,
 263         const char *fmt, ...)
 264 {
 265         va_list args;
 266         unsigned char buf[64];
 267
 268         memset(buf, 0, sizeof buf);
 269
 270         va_start(args, fmt);
 271         vsnprintf(buf, sizeof buf, fmt, args);
 272         va_end(args);
 273
 274         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 275                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 276                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 277                 return -1;
 278         }
 279
 280         return 0;
 281 }
 282
 283 /*
 284  *      This is the leading connection of a new session,
 285  *      or session reinstatement.
 286  */
 287 static int iscsi_login_zero_tsih_s1(
 288         struct iscsi_conn *conn,
 289         unsigned char *buf)
 290 {
 291         struct iscsi_session *sess = NULL;
 292         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 293         int ret;
 294
 295         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 296         if (!sess) {
 297                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 298                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 299                 pr_err("Could not allocate memory for session\n");
 300                 return -ENOMEM;
 301         }
 302
 303         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 304         sess->init_task_tag     = pdu->itt;
 305         memcpy(&sess->isid, pdu->isid, 6);
 306         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 307         INIT_LIST_HEAD(&sess->sess_conn_list);
 308         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 309         INIT_LIST_HEAD(&sess->cr_active_list);
 310         INIT_LIST_HEAD(&sess->cr_inactive_list);
 311         init_completion(&sess->async_msg_comp);
 312         init_completion(&sess->reinstatement_comp);
 313         init_completion(&sess->session_wait_comp);
 314         init_completion(&sess->session_waiting_on_uc_comp);
 315         mutex_init(&sess->cmdsn_mutex);
 316         spin_lock_init(&sess->conn_lock);
 317         spin_lock_init(&sess->cr_a_lock);
 318         spin_lock_init(&sess->cr_i_lock);
 319         spin_lock_init(&sess->session_usage_lock);
 320         spin_lock_init(&sess->ttt_lock);
 321
 322         idr_preload(GFP_KERNEL);
 323         spin_lock_bh(&sess_idr_lock);
 324         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 325         if (ret >= 0)
 326                 sess->session_index = ret;
 327         spin_unlock_bh(&sess_idr_lock);
 328         idr_preload_end();
 329
 330         if (ret < 0) {
 331                 pr_err("idr_alloc() for sess_idr failed\n");
 332                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 333                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 334                 kfree(sess);
 335                 return -ENOMEM;
 336         }
 337
 338         sess->creation_time = get_jiffies_64();
 339         /*
 340          * The FFP CmdSN window values will be allocated from the TPG's
 341          * Initiator Node's ACL once the login has been successfully completed.
 342          */
 343         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 344
 345         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 346         if (!sess->sess_ops) {
 347                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 348                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 349                 pr_err("Unable to allocate memory for"
 350                                 " struct iscsi_sess_ops.\n");
 351                 kfree(sess);
 352                 return -ENOMEM;
 353         }
 354
 355         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 356         if (IS_ERR(sess->se_sess)) {
 357                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 358                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 359                 kfree(sess->sess_ops);
 360                 kfree(sess);
 361                 return -ENOMEM;
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int iscsi_login_zero_tsih_s2(
 368         struct iscsi_conn *conn)
 369 {
 370         struct iscsi_node_attrib *na;
 371         struct iscsi_session *sess = conn->sess;
 372         bool iser = false;
 373
 374         sess->tpg = conn->tpg;
 375
 376         /*
 377          * Assign a new TPG Session Handle.  Note this is protected with
 378          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 379          */
 380         sess->tsih = ++sess->tpg->ntsih;
 381         if (!sess->tsih)
 382                 sess->tsih = ++sess->tpg->ntsih;
 383
 384         /*
 385          * Create the default params from user defined values..
 386          */
 387         if (iscsi_copy_param_list(&conn->param_list,
 388                                 conn->tpg->param_list, 1) < 0) {
 389                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 390                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 391                 return -1;
 392         }
 393
 394         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 395                 iser = true;
 396
 397         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 398
 399         if (sess->sess_ops->SessionType)
 400                 return iscsi_set_keys_irrelevant_for_discovery(
 401                                 conn->param_list);
 402
 403         na = iscsit_tpg_get_node_attrib(sess);
 404
 405         /*
 406          * Need to send TargetPortalGroupTag back in first login response
 407          * on any iSCSI connection where the Initiator provides TargetName.
 408          * See 5.3.1.  Login Phase Start
 409          *
 410          * In our case, we have already located the struct iscsi_tiqn at this point.
 411          */
 412         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 413                 return -1;
 414
 415         /*
 416          * Workaround for Initiators that have broken connection recovery logic.
 417          *
 418          * "We would really like to get rid of this." Linux-iSCSI.org team
 419          */
 420         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 421                 return -1;
 422
 423         /*
 424          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 425          */
 426         if (iser) {
 427                 struct iscsi_param *param;
 428                 unsigned long mrdsl, off;
 429                 int rc;
 430
 431                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 432                         return -1;
 433
 434                 /*
 435                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 436                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 437                  */
 438                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 439                                                   conn->param_list);
 440                 if (!param) {
 441                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 442                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 443                         return -1;
 444                 }
 445                 rc = kstrtoul(param->value, 0, &mrdsl);
 446                 if (rc < 0) {
 447                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 448                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 449                         return -1;
 450                 }
 451                 off = mrdsl % PAGE_SIZE;
 452                 if (!off)
 453                         goto check_prot;
 454
 455                 if (mrdsl < PAGE_SIZE)
 456                         mrdsl = PAGE_SIZE;
 457                 else
 458                         mrdsl -= off;
 459
 460                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 461                         " to PAGE_SIZE\n", mrdsl);
 462
 463                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 464                         return -1;
 465                 /*
 466                  * ISER currently requires that ImmediateData + Unsolicited
 467                  * Data be disabled when protection / signature MRs are enabled.
 468                  */
 469 check_prot:
 470                 if (sess->se_sess->sup_prot_ops &
 471                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 472                     TARGET_PROT_DOUT_INSERT)) {
 473
 474                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 475                                 return -1;
 476
 477                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 478                                 return -1;
 479
 480                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 481                                  " T10-PI enabled ISER session\n");
 482                 }
 483         }
 484
 485         return 0;
 486 }
 487
 488 static int iscsi_login_non_zero_tsih_s1(
 489         struct iscsi_conn *conn,
 490         unsigned char *buf)
 491 {
 492         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 493
 494         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 495         return 0;
 496 }
 497
 498 /*
 499  *      Add a new connection to an existing session.
 500  */
 501 static int iscsi_login_non_zero_tsih_s2(
 502         struct iscsi_conn *conn,
 503         unsigned char *buf)
 504 {
 505         struct iscsi_portal_group *tpg = conn->tpg;
 506         struct iscsi_session *sess = NULL, *sess_p = NULL;
 507         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 508         struct se_session *se_sess, *se_sess_tmp;
 509         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 510         bool iser = false;
 511
 512         spin_lock_bh(&se_tpg->session_lock);
 513         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 514                         sess_list) {
 515
 516                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 517                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 518                     atomic_read(&sess_p->session_logout) ||
 519                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 520                         continue;
 521                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 522                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 523                         iscsit_inc_session_usage_count(sess_p);
 524                         iscsit_stop_time2retain_timer(sess_p);
 525                         sess = sess_p;
 526                         break;
 527                 }
 528         }
 529         spin_unlock_bh(&se_tpg->session_lock);
 530
 531         /*
 532          * If the Time2Retain handler has expired, the session is already gone.
 533          */
 534         if (!sess) {
 535                 pr_err("Initiator attempting to add a connection to"
 536                         " a non-existent session, rejecting iSCSI Login.\n");
 537                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 538                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 539                 return -1;
 540         }
 541
 542         /*
 543          * Stop the Time2Retain timer if this is a failed session, we restart
 544          * the timer if the login is not successful.
 545          */
 546         spin_lock_bh(&sess->conn_lock);
 547         if (sess->session_state == TARG_SESS_STATE_FAILED)
 548                 atomic_set(&sess->session_continuation, 1);
 549         spin_unlock_bh(&sess->conn_lock);
 550
 551         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 552
 553         if (iscsi_copy_param_list(&conn->param_list,
 554                         conn->tpg->param_list, 0) < 0) {
 555                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 556                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 557                 return -1;
 558         }
 559
 560         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 561                 iser = true;
 562
 563         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 564         /*
 565          * Need to send TargetPortalGroupTag back in first login response
 566          * on any iSCSI connection where the Initiator provides TargetName.
 567          * See 5.3.1.  Login Phase Start
 568          *
 569          * In our case, we have already located the struct iscsi_tiqn at this point.
 570          */
 571         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 572                 return -1;
 573
 574         return 0;
 575 }
 576
 577 int iscsi_login_post_auth_non_zero_tsih(
 578         struct iscsi_conn *conn,
 579         u16 cid,
 580         u32 exp_statsn)
 581 {
 582         struct iscsi_conn *conn_ptr = NULL;
 583         struct iscsi_conn_recovery *cr = NULL;
 584         struct iscsi_session *sess = conn->sess;
 585
 586         /*
 587          * By following item 5 in the login table,  if we have found
 588          * an existing ISID and a valid/existing TSIH and an existing
 589          * CID we do connection reinstatement.  Currently we dont not
 590          * support it so we send back an non-zero status class to the
 591          * initiator and release the new connection.
 592          */
 593         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 594         if (conn_ptr) {
 595                 pr_err("Connection exists with CID %hu for %s,"
 596                         " performing connection reinstatement.\n",
 597                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 598
 599                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 600                 iscsit_dec_conn_usage_count(conn_ptr);
 601         }
 602
 603         /*
 604          * Check for any connection recovery entires containing CID.
 605          * We use the original ExpStatSN sent in the first login request
 606          * to acknowledge commands for the failed connection.
 607          *
 608          * Also note that an explict logout may have already been sent,
 609          * but the response may not be sent due to additional connection
 610          * loss.
 611          */
 612         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 613                 cr = iscsit_get_inactive_connection_recovery_entry(
 614                                 sess, cid);
 615                 if (cr) {
 616                         pr_debug("Performing implicit logout"
 617                                 " for connection recovery on CID: %hu\n",
 618                                         conn->cid);
 619                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 620                 }
 621         }
 622
 623         /*
 624          * Else we follow item 4 from the login table in that we have
 625          * found an existing ISID and a valid/existing TSIH and a new
 626          * CID we go ahead and continue to add a new connection to the
 627          * session.
 628          */
 629         pr_debug("Adding CID %hu to existing session for %s.\n",
 630                         cid, sess->sess_ops->InitiatorName);
 631
 632         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 633                 pr_err("Adding additional connection to this session"
 634                         " would exceed MaxConnections %d, login failed.\n",
 635                                 sess->sess_ops->MaxConnections);
 636                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 637                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 638                 return -1;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 645 {
 646         struct iscsi_session *sess = conn->sess;
 647         /*
 648          * FIXME: Unsolicitied NopIN support for ISER
 649          */
 650         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 651                 return;
 652
 653         if (!sess->sess_ops->SessionType)
 654                 iscsit_start_nopin_timer(conn);
 655 }
 656
 657 int iscsit_start_kthreads(struct iscsi_conn *conn)
 658 {
 659         int ret = 0;
 660
 661         spin_lock(&iscsit_global->ts_bitmap_lock);
 662         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 663                                         ISCSIT_BITMAP_BITS, get_order(1));
 664         spin_unlock(&iscsit_global->ts_bitmap_lock);
 665
 666         if (conn->bitmap_id < 0) {
 667                 pr_err("bitmap_find_free_region() failed for"
 668                        " iscsit_start_kthreads()\n");
 669                 return -ENOMEM;
 670         }
 671
 672         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 673                                       "%s", ISCSI_TX_THREAD_NAME);
 674         if (IS_ERR(conn->tx_thread)) {
 675                 pr_err("Unable to start iscsi_target_tx_thread\n");
 676                 ret = PTR_ERR(conn->tx_thread);
 677                 goto out_bitmap;
 678         }
 679         conn->tx_thread_active = true;
 680
 681         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 682                                       "%s", ISCSI_RX_THREAD_NAME);
 683         if (IS_ERR(conn->rx_thread)) {
 684                 pr_err("Unable to start iscsi_target_rx_thread\n");
 685                 ret = PTR_ERR(conn->rx_thread);
 686                 goto out_tx;
 687         }
 688         conn->rx_thread_active = true;
 689
 690         return 0;
 691 out_tx:
 692         send_sig(SIGINT, conn->tx_thread, 1);
 693         kthread_stop(conn->tx_thread);
 694         conn->tx_thread_active = false;
 695 out_bitmap:
 696         spin_lock(&iscsit_global->ts_bitmap_lock);
 697         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 698                               get_order(1));
 699         spin_unlock(&iscsit_global->ts_bitmap_lock);
 700         return ret;
 701 }
 702
 703 void iscsi_post_login_handler(
 704         struct iscsi_np *np,
 705         struct iscsi_conn *conn,
 706         u8 zero_tsih)
 707 {
 708         int stop_timer = 0;
 709         struct iscsi_session *sess = conn->sess;
 710         struct se_session *se_sess = sess->se_sess;
 711         struct iscsi_portal_group *tpg = sess->tpg;
 712         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 713
 714         iscsit_inc_conn_usage_count(conn);
 715
 716         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 717                         ISCSI_LOGIN_STATUS_ACCEPT);
 718
 719         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 720         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 721
 722         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 723         /*
 724          * SCSI Initiator -> SCSI Target Port Mapping
 725          */
 726         if (!zero_tsih) {
 727                 iscsi_set_session_parameters(sess->sess_ops,
 728                                 conn->param_list, 0);
 729                 iscsi_release_param_list(conn->param_list);
 730                 conn->param_list = NULL;
 731
 732                 spin_lock_bh(&sess->conn_lock);
 733                 atomic_set(&sess->session_continuation, 0);
 734                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 735                         pr_debug("Moving to"
 736                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 737                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 738                         stop_timer = 1;
 739                 }
 740
 741                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 742                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 743                         &conn->local_sockaddr, tpg->tpgt);
 744
 745                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 746                 atomic_inc(&sess->nconn);
 747                 pr_debug("Incremented iSCSI Connection count to %hu"
 748                         " from node: %s\n", atomic_read(&sess->nconn),
 749                         sess->sess_ops->InitiatorName);
 750                 spin_unlock_bh(&sess->conn_lock);
 751
 752                 iscsi_post_login_start_timers(conn);
 753                 /*
 754                  * Determine CPU mask to ensure connection's RX and TX kthreads
 755                  * are scheduled on the same CPU.
 756                  */
 757                 iscsit_thread_get_cpumask(conn);
 758                 conn->conn_rx_reset_cpumask = 1;
 759                 conn->conn_tx_reset_cpumask = 1;
 760                 /*
 761                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 762                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 763                  */
 764                 complete(&conn->rx_login_comp);
 765                 iscsit_dec_conn_usage_count(conn);
 766
 767                 if (stop_timer) {
 768                         spin_lock_bh(&se_tpg->session_lock);
 769                         iscsit_stop_time2retain_timer(sess);
 770                         spin_unlock_bh(&se_tpg->session_lock);
 771                 }
 772                 iscsit_dec_session_usage_count(sess);
 773                 return;
 774         }
 775
 776         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 777         iscsi_release_param_list(conn->param_list);
 778         conn->param_list = NULL;
 779
 780         iscsit_determine_maxcmdsn(sess);
 781
 782         spin_lock_bh(&se_tpg->session_lock);
 783         __transport_register_session(&sess->tpg->tpg_se_tpg,
 784                         se_sess->se_node_acl, se_sess, sess);
 785         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 786         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 787
 788         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 789                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 790                 tpg->tpgt);
 791
 792         spin_lock_bh(&sess->conn_lock);
 793         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 794         atomic_inc(&sess->nconn);
 795         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 796                 " %s\n", atomic_read(&sess->nconn),
 797                 sess->sess_ops->InitiatorName);
 798         spin_unlock_bh(&sess->conn_lock);
 799
 800         sess->sid = tpg->sid++;
 801         if (!sess->sid)
 802                 sess->sid = tpg->sid++;
 803         pr_debug("Established iSCSI session from node: %s\n",
 804                         sess->sess_ops->InitiatorName);
 805
 806         tpg->nsessions++;
 807         if (tpg->tpg_tiqn)
 808                 tpg->tpg_tiqn->tiqn_nsessions++;
 809
 810         pr_debug("Incremented number of active iSCSI sessions to %u on"
 811                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 812         spin_unlock_bh(&se_tpg->session_lock);
 813
 814         iscsi_post_login_start_timers(conn);
 815         /*
 816          * Determine CPU mask to ensure connection's RX and TX kthreads
 817          * are scheduled on the same CPU.
 818          */
 819         iscsit_thread_get_cpumask(conn);
 820         conn->conn_rx_reset_cpumask = 1;
 821         conn->conn_tx_reset_cpumask = 1;
 822         /*
 823          * Wakeup the sleeping iscsi_target_rx_thread() now that
 824          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 825          */
 826         complete(&conn->rx_login_comp);
 827         iscsit_dec_conn_usage_count(conn);
 828 }
 829
 830 static void iscsi_handle_login_thread_timeout(unsigned long data)
 831 {
 832         struct iscsi_np *np = (struct iscsi_np *) data;
 833
 834         spin_lock_bh(&np->np_thread_lock);
 835         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 836                         &np->np_sockaddr);
 837
 838         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 839                 spin_unlock_bh(&np->np_thread_lock);
 840                 return;
 841         }
 842
 843         if (np->np_thread)
 844                 send_sig(SIGINT, np->np_thread, 1);
 845
 846         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 847         spin_unlock_bh(&np->np_thread_lock);
 848 }
 849
 850 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 851 {
 852         /*
 853          * This used the TA_LOGIN_TIMEOUT constant because at this
 854          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 855          */
 856         spin_lock_bh(&np->np_thread_lock);
 857         init_timer(&np->np_login_timer);
 858         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 859         np->np_login_timer.data = (unsigned long)np;
 860         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 861         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 862         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 863         add_timer(&np->np_login_timer);
 864
 865         pr_debug("Added timeout timer to iSCSI login request for"
 866                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 867         spin_unlock_bh(&np->np_thread_lock);
 868 }
 869
 870 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 871 {
 872         spin_lock_bh(&np->np_thread_lock);
 873         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 874                 spin_unlock_bh(&np->np_thread_lock);
 875                 return;
 876         }
 877         np->np_login_timer_flags |= ISCSI_TF_STOP;
 878         spin_unlock_bh(&np->np_thread_lock);
 879
 880         del_timer_sync(&np->np_login_timer);
 881
 882         spin_lock_bh(&np->np_thread_lock);
 883         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 884         spin_unlock_bh(&np->np_thread_lock);
 885 }
 886
 887 int iscsit_setup_np(
 888         struct iscsi_np *np,
 889         struct sockaddr_storage *sockaddr)
 890 {
 891         struct socket *sock = NULL;
 892         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 893
 894         switch (np->np_network_transport) {
 895         case ISCSI_TCP:
 896                 np->np_ip_proto = IPPROTO_TCP;
 897                 np->np_sock_type = SOCK_STREAM;
 898                 break;
 899         case ISCSI_SCTP_TCP:
 900                 np->np_ip_proto = IPPROTO_SCTP;
 901                 np->np_sock_type = SOCK_STREAM;
 902                 break;
 903         case ISCSI_SCTP_UDP:
 904                 np->np_ip_proto = IPPROTO_SCTP;
 905                 np->np_sock_type = SOCK_SEQPACKET;
 906                 break;
 907         default:
 908                 pr_err("Unsupported network_transport: %d\n",
 909                                 np->np_network_transport);
 910                 return -EINVAL;
 911         }
 912
 913         np->np_ip_proto = IPPROTO_TCP;
 914         np->np_sock_type = SOCK_STREAM;
 915
 916         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 917                         np->np_ip_proto, &sock);
 918         if (ret < 0) {
 919                 pr_err("sock_create() failed.\n");
 920                 return ret;
 921         }
 922         np->np_socket = sock;
 923         /*
 924          * Setup the np->np_sockaddr from the passed sockaddr setup
 925          * in iscsi_target_configfs.c code..
 926          */
 927         memcpy(&np->np_sockaddr, sockaddr,
 928                         sizeof(struct sockaddr_storage));
 929
 930         if (sockaddr->ss_family == AF_INET6)
 931                 len = sizeof(struct sockaddr_in6);
 932         else
 933                 len = sizeof(struct sockaddr_in);
 934         /*
 935          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 936          */
 937         /* FIXME: Someone please explain why this is endian-safe */
 938         opt = 1;
 939         if (np->np_network_transport == ISCSI_TCP) {
 940                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 941                                 (char *)&opt, sizeof(opt));
 942                 if (ret < 0) {
 943                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 944                                 " failed: %d\n", ret);
 945                         goto fail;
 946                 }
 947         }
 948
 949         /* FIXME: Someone please explain why this is endian-safe */
 950         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 951                         (char *)&opt, sizeof(opt));
 952         if (ret < 0) {
 953                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 954                         " failed\n");
 955                 goto fail;
 956         }
 957
 958         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 959                         (char *)&opt, sizeof(opt));
 960         if (ret < 0) {
 961                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 962                         " failed\n");
 963                 goto fail;
 964         }
 965
 966         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 967         if (ret < 0) {
 968                 pr_err("kernel_bind() failed: %d\n", ret);
 969                 goto fail;
 970         }
 971
 972         ret = kernel_listen(sock, backlog);
 973         if (ret != 0) {
 974                 pr_err("kernel_listen() failed: %d\n", ret);
 975                 goto fail;
 976         }
 977
 978         return 0;
 979 fail:
 980         np->np_socket = NULL;
 981         sock_release(sock);
 982         return ret;
 983 }
 984
 985 int iscsi_target_setup_login_socket(
 986         struct iscsi_np *np,
 987         struct sockaddr_storage *sockaddr)
 988 {
 989         struct iscsit_transport *t;
 990         int rc;
 991
 992         t = iscsit_get_transport(np->np_network_transport);
 993         if (!t)
 994                 return -EINVAL;
 995
 996         rc = t->iscsit_setup_np(np, sockaddr);
 997         if (rc < 0) {
 998                 iscsit_put_transport(t);
 999                 return rc;
1000         }
1001
1002         np->np_transport = t;
1003         np->enabled = true;
1004         return 0;
1005 }
1006
1007 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1008 {
1009         struct socket *new_sock, *sock = np->np_socket;
1010         struct sockaddr_in sock_in;
1011         struct sockaddr_in6 sock_in6;
1012         int rc, err;
1013
1014         rc = kernel_accept(sock, &new_sock, 0);
1015         if (rc < 0)
1016                 return rc;
1017
1018         conn->sock = new_sock;
1019         conn->login_family = np->np_sockaddr.ss_family;
1020
1021         if (np->np_sockaddr.ss_family == AF_INET6) {
1022                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1023
1024                 rc = conn->sock->ops->getname(conn->sock,
1025                                 (struct sockaddr *)&sock_in6, &err, 1);
1026                 if (!rc) {
1027                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1028                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1029                         } else {
1030                                 /* Pretend to be an ipv4 socket */
1031                                 sock_in.sin_family = AF_INET;
1032                                 sock_in.sin_port = sock_in6.sin6_port;
1033                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1034                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1035                         }
1036                 }
1037
1038                 rc = conn->sock->ops->getname(conn->sock,
1039                                 (struct sockaddr *)&sock_in6, &err, 0);
1040                 if (!rc) {
1041                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1042                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1043                         } else {
1044                                 /* Pretend to be an ipv4 socket */
1045                                 sock_in.sin_family = AF_INET;
1046                                 sock_in.sin_port = sock_in6.sin6_port;
1047                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1048                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1049                         }
1050                 }
1051         } else {
1052                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1053
1054                 rc = conn->sock->ops->getname(conn->sock,
1055                                 (struct sockaddr *)&sock_in, &err, 1);
1056                 if (!rc)
1057                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1058
1059                 rc = conn->sock->ops->getname(conn->sock,
1060                                 (struct sockaddr *)&sock_in, &err, 0);
1061                 if (!rc)
1062                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1063         }
1064
1065         return 0;
1066 }
1067
1068 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1069 {
1070         struct iscsi_login_req *login_req;
1071         u32 padding = 0, payload_length;
1072
1073         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1074                 return -1;
1075
1076         login_req = (struct iscsi_login_req *)login->req;
1077         payload_length  = ntoh24(login_req->dlength);
1078         padding = ((-payload_length) & 3);
1079
1080         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1081                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1082                 login_req->flags, login_req->itt, login_req->cmdsn,
1083                 login_req->exp_statsn, login_req->cid, payload_length);
1084         /*
1085          * Setup the initial iscsi_login values from the leading
1086          * login request PDU.
1087          */
1088         if (login->first_request) {
1089                 login_req = (struct iscsi_login_req *)login->req;
1090                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1091                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1092                 login->version_min      = login_req->min_version;
1093                 login->version_max      = login_req->max_version;
1094                 memcpy(login->isid, login_req->isid, 6);
1095                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1096                 login->init_task_tag    = login_req->itt;
1097                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1098                 login->cid              = be16_to_cpu(login_req->cid);
1099                 login->tsih             = be16_to_cpu(login_req->tsih);
1100         }
1101
1102         if (iscsi_target_check_login_request(conn, login) < 0)
1103                 return -1;
1104
1105         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1106         if (iscsi_login_rx_data(conn, login->req_buf,
1107                                 payload_length + padding) < 0)
1108                 return -1;
1109
1110         return 0;
1111 }
1112
1113 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1114                         u32 length)
1115 {
1116         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1117                 return -1;
1118
1119         return 0;
1120 }
1121
1122 static int
1123 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1124 {
1125         int rc;
1126
1127         if (!t->owner) {
1128                 conn->conn_transport = t;
1129                 return 0;
1130         }
1131
1132         rc = try_module_get(t->owner);
1133         if (!rc) {
1134                 pr_err("try_module_get() failed for %s\n", t->name);
1135                 return -EINVAL;
1136         }
1137
1138         conn->conn_transport = t;
1139         return 0;
1140 }
1141
1142 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1143                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1144 {
1145         if (!new_sess)
1146                 goto old_sess_out;
1147
1148         pr_err("iSCSI Login negotiation failed.\n");
1149         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1150                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1151         if (!zero_tsih || !conn->sess)
1152                 goto old_sess_out;
1153         if (conn->sess->se_sess)
1154                 transport_free_session(conn->sess->se_sess);
1155         if (conn->sess->session_index != 0) {
1156                 spin_lock_bh(&sess_idr_lock);
1157                 idr_remove(&sess_idr, conn->sess->session_index);
1158                 spin_unlock_bh(&sess_idr_lock);
1159         }
1160         kfree(conn->sess->sess_ops);
1161         kfree(conn->sess);
1162         conn->sess = NULL;
1163
1164 old_sess_out:
1165         iscsi_stop_login_thread_timer(np);
1166         /*
1167          * If login negotiation fails check if the Time2Retain timer
1168          * needs to be restarted.
1169          */
1170         if (!zero_tsih && conn->sess) {
1171                 spin_lock_bh(&conn->sess->conn_lock);
1172                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1173                         struct se_portal_group *se_tpg =
1174                                         &conn->tpg->tpg_se_tpg;
1175
1176                         atomic_set(&conn->sess->session_continuation, 0);
1177                         spin_unlock_bh(&conn->sess->conn_lock);
1178                         spin_lock_bh(&se_tpg->session_lock);
1179                         iscsit_start_time2retain_handler(conn->sess);
1180                         spin_unlock_bh(&se_tpg->session_lock);
1181                 } else
1182                         spin_unlock_bh(&conn->sess->conn_lock);
1183                 iscsit_dec_session_usage_count(conn->sess);
1184         }
1185
1186         ahash_request_free(conn->conn_tx_hash);
1187         if (conn->conn_rx_hash) {
1188                 struct crypto_ahash *tfm;
1189
1190                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1191                 ahash_request_free(conn->conn_rx_hash);
1192                 crypto_free_ahash(tfm);
1193         }
1194
1195         free_cpumask_var(conn->conn_cpumask);
1196
1197         kfree(conn->conn_ops);
1198
1199         if (conn->param_list) {
1200                 iscsi_release_param_list(conn->param_list);
1201                 conn->param_list = NULL;
1202         }
1203         iscsi_target_nego_release(conn);
1204
1205         if (conn->sock) {
1206                 sock_release(conn->sock);
1207                 conn->sock = NULL;
1208         }
1209
1210         if (conn->conn_transport->iscsit_wait_conn)
1211                 conn->conn_transport->iscsit_wait_conn(conn);
1212
1213         if (conn->conn_transport->iscsit_free_conn)
1214                 conn->conn_transport->iscsit_free_conn(conn);
1215
1216         iscsit_put_transport(conn->conn_transport);
1217         kfree(conn);
1218 }
1219
1220 static int __iscsi_target_login_thread(struct iscsi_np *np)
1221 {
1222         u8 *buffer, zero_tsih = 0;
1223         int ret = 0, rc;
1224         struct iscsi_conn *conn = NULL;
1225         struct iscsi_login *login;
1226         struct iscsi_portal_group *tpg = NULL;
1227         struct iscsi_login_req *pdu;
1228         struct iscsi_tpg_np *tpg_np;
1229         bool new_sess = false;
1230
1231         flush_signals(current);
1232
1233         spin_lock_bh(&np->np_thread_lock);
1234         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1235                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1236                 complete(&np->np_restart_comp);
1237         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1238                 spin_unlock_bh(&np->np_thread_lock);
1239                 goto exit;
1240         } else {
1241                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1242         }
1243         spin_unlock_bh(&np->np_thread_lock);
1244
1245         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1246         if (!conn) {
1247                 pr_err("Could not allocate memory for"
1248                         " new connection\n");
1249                 /* Get another socket */
1250                 return 1;
1251         }
1252         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1253         conn->conn_state = TARG_CONN_STATE_FREE;
1254
1255         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1256                 kfree(conn);
1257                 return 1;
1258         }
1259
1260         rc = np->np_transport->iscsit_accept_np(np, conn);
1261         if (rc == -ENOSYS) {
1262                 complete(&np->np_restart_comp);
1263                 iscsit_put_transport(conn->conn_transport);
1264                 kfree(conn);
1265                 conn = NULL;
1266                 goto exit;
1267         } else if (rc < 0) {
1268                 spin_lock_bh(&np->np_thread_lock);
1269                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1270                         spin_unlock_bh(&np->np_thread_lock);
1271                         complete(&np->np_restart_comp);
1272                         iscsit_put_transport(conn->conn_transport);
1273                         kfree(conn);
1274                         conn = NULL;
1275                         /* Get another socket */
1276                         return 1;
1277                 }
1278                 spin_unlock_bh(&np->np_thread_lock);
1279                 iscsit_put_transport(conn->conn_transport);
1280                 kfree(conn);
1281                 conn = NULL;
1282                 goto out;
1283         }
1284         /*
1285          * Perform the remaining iSCSI connection initialization items..
1286          */
1287         login = iscsi_login_init_conn(conn);
1288         if (!login) {
1289                 goto new_sess_out;
1290         }
1291
1292         iscsi_start_login_thread_timer(np);
1293
1294         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1295         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1296         /*
1297          * This will process the first login request + payload..
1298          */
1299         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1300         if (rc == 1)
1301                 return 1;
1302         else if (rc < 0)
1303                 goto new_sess_out;
1304
1305         buffer = &login->req[0];
1306         pdu = (struct iscsi_login_req *)buffer;
1307         /*
1308          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1309          * when Status-Class != 0.
1310         */
1311         conn->login_itt = pdu->itt;
1312
1313         spin_lock_bh(&np->np_thread_lock);
1314         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1315                 spin_unlock_bh(&np->np_thread_lock);
1316                 pr_err("iSCSI Network Portal on %pISpc currently not"
1317                         " active.\n", &np->np_sockaddr);
1318                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1319                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1320                 goto new_sess_out;
1321         }
1322         spin_unlock_bh(&np->np_thread_lock);
1323
1324         conn->network_transport = np->np_network_transport;
1325
1326         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1327                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1328                 &conn->local_sockaddr);
1329
1330         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1331         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1332
1333         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1334                         pdu->min_version) < 0)
1335                 goto new_sess_out;
1336
1337         zero_tsih = (pdu->tsih == 0x0000);
1338         if (zero_tsih) {
1339                 /*
1340                  * This is the leading connection of a new session.
1341                  * We wait until after authentication to check for
1342                  * session reinstatement.
1343                  */
1344                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1345                         goto new_sess_out;
1346         } else {
1347                 /*
1348                  * Add a new connection to an existing session.
1349                  * We check for a non-existant session in
1350                  * iscsi_login_non_zero_tsih_s2() below based
1351                  * on ISID/TSIH, but wait until after authentication
1352                  * to check for connection reinstatement, etc.
1353                  */
1354                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1355                         goto new_sess_out;
1356         }
1357         /*
1358          * SessionType: Discovery
1359          *
1360          *      Locates Default Portal
1361          *
1362          * SessionType: Normal
1363          *
1364          *      Locates Target Portal from NP -> Target IQN
1365          */
1366         rc = iscsi_target_locate_portal(np, conn, login);
1367         if (rc < 0) {
1368                 tpg = conn->tpg;
1369                 goto new_sess_out;
1370         }
1371         login->zero_tsih = zero_tsih;
1372
1373         conn->sess->se_sess->sup_prot_ops =
1374                 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1375
1376         tpg = conn->tpg;
1377         if (!tpg) {
1378                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1379                 goto new_sess_out;
1380         }
1381
1382         if (zero_tsih) {
1383                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1384                         goto new_sess_out;
1385         } else {
1386                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1387                         goto old_sess_out;
1388         }
1389
1390         ret = iscsi_target_start_negotiation(login, conn);
1391         if (ret < 0)
1392                 goto new_sess_out;
1393
1394         iscsi_stop_login_thread_timer(np);
1395
1396         if (ret == 1) {
1397                 tpg_np = conn->tpg_np;
1398
1399                 iscsi_post_login_handler(np, conn, zero_tsih);
1400                 iscsit_deaccess_np(np, tpg, tpg_np);
1401         }
1402
1403         tpg = NULL;
1404         tpg_np = NULL;
1405         /* Get another socket */
1406         return 1;
1407
1408 new_sess_out:
1409         new_sess = true;
1410 old_sess_out:
1411         tpg_np = conn->tpg_np;
1412         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1413         new_sess = false;
1414
1415         if (tpg) {
1416                 iscsit_deaccess_np(np, tpg, tpg_np);
1417                 tpg = NULL;
1418                 tpg_np = NULL;
1419         }
1420
1421 out:
1422         return 1;
1423
1424 exit:
1425         iscsi_stop_login_thread_timer(np);
1426         spin_lock_bh(&np->np_thread_lock);
1427         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1428         spin_unlock_bh(&np->np_thread_lock);
1429
1430         return 0;
1431 }
1432
1433 int iscsi_target_login_thread(void *arg)
1434 {
1435         struct iscsi_np *np = arg;
1436         int ret;
1437
1438         allow_signal(SIGINT);
1439
1440         while (1) {
1441                 ret = __iscsi_target_login_thread(np);
1442                 /*
1443                  * We break and exit here unless another sock_accept() call
1444                  * is expected.
1445                  */
1446                 if (ret != 1)
1447                         break;
1448         }
1449
1450         return 0;
1451 }