drivers/target/iscsi/iscsi_target_login.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains the login functions used by the iSCSI Target driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14 #include <linux/kthread.h>
  15 #include <linux/sched/signal.h>
  16 #include <linux/idr.h>
  17 #include <linux/tcp.h>        /* TCP_NODELAY */
  18 #include <net/ip.h>
  19 #include <net/ipv6.h>         /* ipv6_addr_v4mapped() */
  20 #include <scsi/iscsi_proto.h>
  21 #include <target/target_core_base.h>
  22 #include <target/target_core_fabric.h>
  23
  24 #include <target/iscsi/iscsi_target_core.h>
  25 #include <target/iscsi/iscsi_target_stat.h>
  26 #include "iscsi_target_device.h"
  27 #include "iscsi_target_nego.h"
  28 #include "iscsi_target_erl0.h"
  29 #include "iscsi_target_erl2.h"
  30 #include "iscsi_target_login.h"
  31 #include "iscsi_target_tpg.h"
  32 #include "iscsi_target_util.h"
  33 #include "iscsi_target.h"
  34 #include "iscsi_target_parameters.h"
  35
  36 #include <target/iscsi/iscsi_transport.h>
  37
  38 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  39 {
  40         struct iscsi_login *login;
  41
  42         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  43         if (!login) {
  44                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  45                 return NULL;
  46         }
  47         conn->login = login;
  48         login->conn = conn;
  49         login->first_request = 1;
  50
  51         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  52         if (!login->req_buf) {
  53                 pr_err("Unable to allocate memory for response buffer.\n");
  54                 goto out_login;
  55         }
  56
  57         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  58         if (!login->rsp_buf) {
  59                 pr_err("Unable to allocate memory for request buffer.\n");
  60                 goto out_req_buf;
  61         }
  62
  63         conn->conn_login = login;
  64
  65         return login;
  66
  67 out_req_buf:
  68         kfree(login->req_buf);
  69 out_login:
  70         kfree(login);
  71         return NULL;
  72 }
  73
  74 /*
  75  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  76  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  77  */
  78 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  79 {
  80         struct crypto_ahash *tfm;
  81
  82         /*
  83          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  84          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  85          * to software 1x8 byte slicing from crc32c.ko
  86          */
  87         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
  88         if (IS_ERR(tfm)) {
  89                 pr_err("crypto_alloc_ahash() failed\n");
  90                 return -ENOMEM;
  91         }
  92
  93         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
  94         if (!conn->conn_rx_hash) {
  95                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
  96                 crypto_free_ahash(tfm);
  97                 return -ENOMEM;
  98         }
  99         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
 100
 101         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 102         if (!conn->conn_tx_hash) {
 103                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 104                 ahash_request_free(conn->conn_rx_hash);
 105                 conn->conn_rx_hash = NULL;
 106                 crypto_free_ahash(tfm);
 107                 return -ENOMEM;
 108         }
 109         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 110
 111         return 0;
 112 }
 113
 114 static int iscsi_login_check_initiator_version(
 115         struct iscsi_conn *conn,
 116         u8 version_max,
 117         u8 version_min)
 118 {
 119         if ((version_max != 0x00) || (version_min != 0x00)) {
 120                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 121                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 122                         version_min, version_max);
 123                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 124                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 125                 return -1;
 126         }
 127
 128         return 0;
 129 }
 130
 131 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 132 {
 133         int sessiontype;
 134         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 135         struct iscsi_portal_group *tpg = conn->tpg;
 136         struct iscsi_session *sess = NULL, *sess_p = NULL;
 137         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 138         struct se_session *se_sess, *se_sess_tmp;
 139
 140         initiatorname_param = iscsi_find_param_from_key(
 141                         INITIATORNAME, conn->param_list);
 142         sessiontype_param = iscsi_find_param_from_key(
 143                         SESSIONTYPE, conn->param_list);
 144         if (!initiatorname_param || !sessiontype_param) {
 145                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 146                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 147                 return -1;
 148         }
 149
 150         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 151
 152         spin_lock_bh(&se_tpg->session_lock);
 153         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 154                         sess_list) {
 155
 156                 sess_p = se_sess->fabric_sess_ptr;
 157                 spin_lock(&sess_p->conn_lock);
 158                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 159                     atomic_read(&sess_p->session_logout) ||
 160                     atomic_read(&sess_p->session_close) ||
 161                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 162                         spin_unlock(&sess_p->conn_lock);
 163                         continue;
 164                 }
 165                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 166                    (!strcmp(sess_p->sess_ops->InitiatorName,
 167                             initiatorname_param->value) &&
 168                    (sess_p->sess_ops->SessionType == sessiontype))) {
 169                         atomic_set(&sess_p->session_reinstatement, 1);
 170                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 171                         atomic_set(&sess_p->session_close, 1);
 172                         spin_unlock(&sess_p->conn_lock);
 173                         iscsit_inc_session_usage_count(sess_p);
 174                         iscsit_stop_time2retain_timer(sess_p);
 175                         sess = sess_p;
 176                         break;
 177                 }
 178                 spin_unlock(&sess_p->conn_lock);
 179         }
 180         spin_unlock_bh(&se_tpg->session_lock);
 181         /*
 182          * If the Time2Retain handler has expired, the session is already gone.
 183          */
 184         if (!sess)
 185                 return 0;
 186
 187         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 188                 " performing session reinstatement.\n", (sessiontype) ?
 189                 "Discovery" : "Normal", sess->sid,
 190                 sess->sess_ops->InitiatorName);
 191
 192         spin_lock_bh(&sess->conn_lock);
 193         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 194                 spin_unlock_bh(&sess->conn_lock);
 195                 iscsit_dec_session_usage_count(sess);
 196                 return 0;
 197         }
 198         spin_unlock_bh(&sess->conn_lock);
 199
 200         iscsit_stop_session(sess, 1, 1);
 201         iscsit_dec_session_usage_count(sess);
 202
 203         return 0;
 204 }
 205
 206 static int iscsi_login_set_conn_values(
 207         struct iscsi_session *sess,
 208         struct iscsi_conn *conn,
 209         __be16 cid)
 210 {
 211         int ret;
 212         conn->sess              = sess;
 213         conn->cid               = be16_to_cpu(cid);
 214         /*
 215          * Generate a random Status sequence number (statsn) for the new
 216          * iSCSI connection.
 217          */
 218         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 219         if (unlikely(ret))
 220                 return ret;
 221
 222         mutex_lock(&auth_id_lock);
 223         conn->auth_id           = iscsit_global->auth_id++;
 224         mutex_unlock(&auth_id_lock);
 225         return 0;
 226 }
 227
 228 __printf(2, 3) int iscsi_change_param_sprintf(
 229         struct iscsi_conn *conn,
 230         const char *fmt, ...)
 231 {
 232         va_list args;
 233         unsigned char buf[64];
 234
 235         memset(buf, 0, sizeof buf);
 236
 237         va_start(args, fmt);
 238         vsnprintf(buf, sizeof buf, fmt, args);
 239         va_end(args);
 240
 241         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 242                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 243                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 244                 return -1;
 245         }
 246
 247         return 0;
 248 }
 249 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 250
 251 /*
 252  *      This is the leading connection of a new session,
 253  *      or session reinstatement.
 254  */
 255 static int iscsi_login_zero_tsih_s1(
 256         struct iscsi_conn *conn,
 257         unsigned char *buf)
 258 {
 259         struct iscsi_session *sess = NULL;
 260         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 261         int ret;
 262
 263         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 264         if (!sess) {
 265                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 266                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 267                 pr_err("Could not allocate memory for session\n");
 268                 return -ENOMEM;
 269         }
 270
 271         if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
 272                 goto free_sess;
 273
 274         sess->init_task_tag     = pdu->itt;
 275         memcpy(&sess->isid, pdu->isid, 6);
 276         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 277         INIT_LIST_HEAD(&sess->sess_conn_list);
 278         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 279         INIT_LIST_HEAD(&sess->cr_active_list);
 280         INIT_LIST_HEAD(&sess->cr_inactive_list);
 281         init_completion(&sess->async_msg_comp);
 282         init_completion(&sess->reinstatement_comp);
 283         init_completion(&sess->session_wait_comp);
 284         init_completion(&sess->session_waiting_on_uc_comp);
 285         mutex_init(&sess->cmdsn_mutex);
 286         spin_lock_init(&sess->conn_lock);
 287         spin_lock_init(&sess->cr_a_lock);
 288         spin_lock_init(&sess->cr_i_lock);
 289         spin_lock_init(&sess->session_usage_lock);
 290         spin_lock_init(&sess->ttt_lock);
 291
 292         timer_setup(&sess->time2retain_timer,
 293                     iscsit_handle_time2retain_timeout, 0);
 294
 295         ret = ida_alloc(&sess_ida, GFP_KERNEL);
 296         if (ret < 0) {
 297                 pr_err("Session ID allocation failed %d\n", ret);
 298                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 299                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 300                 goto free_sess;
 301         }
 302
 303         sess->session_index = ret;
 304         sess->creation_time = get_jiffies_64();
 305         /*
 306          * The FFP CmdSN window values will be allocated from the TPG's
 307          * Initiator Node's ACL once the login has been successfully completed.
 308          */
 309         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 310
 311         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 312         if (!sess->sess_ops) {
 313                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 314                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 315                 pr_err("Unable to allocate memory for"
 316                                 " struct iscsi_sess_ops.\n");
 317                 goto free_id;
 318         }
 319
 320         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 321         if (IS_ERR(sess->se_sess)) {
 322                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 323                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 324                 goto free_ops;
 325         }
 326
 327         return 0;
 328
 329 free_ops:
 330         kfree(sess->sess_ops);
 331 free_id:
 332         ida_free(&sess_ida, sess->session_index);
 333 free_sess:
 334         kfree(sess);
 335         conn->sess = NULL;
 336         return -ENOMEM;
 337 }
 338
 339 static int iscsi_login_zero_tsih_s2(
 340         struct iscsi_conn *conn)
 341 {
 342         struct iscsi_node_attrib *na;
 343         struct iscsi_session *sess = conn->sess;
 344         bool iser = false;
 345
 346         sess->tpg = conn->tpg;
 347
 348         /*
 349          * Assign a new TPG Session Handle.  Note this is protected with
 350          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 351          */
 352         sess->tsih = ++sess->tpg->ntsih;
 353         if (!sess->tsih)
 354                 sess->tsih = ++sess->tpg->ntsih;
 355
 356         /*
 357          * Create the default params from user defined values..
 358          */
 359         if (iscsi_copy_param_list(&conn->param_list,
 360                                 conn->tpg->param_list, 1) < 0) {
 361                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 362                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 363                 return -1;
 364         }
 365
 366         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 367                 iser = true;
 368
 369         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 370
 371         if (sess->sess_ops->SessionType)
 372                 return iscsi_set_keys_irrelevant_for_discovery(
 373                                 conn->param_list);
 374
 375         na = iscsit_tpg_get_node_attrib(sess);
 376
 377         /*
 378          * Need to send TargetPortalGroupTag back in first login response
 379          * on any iSCSI connection where the Initiator provides TargetName.
 380          * See 5.3.1.  Login Phase Start
 381          *
 382          * In our case, we have already located the struct iscsi_tiqn at this point.
 383          */
 384         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 385                 return -1;
 386
 387         /*
 388          * Workaround for Initiators that have broken connection recovery logic.
 389          *
 390          * "We would really like to get rid of this." Linux-iSCSI.org team
 391          */
 392         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 393                 return -1;
 394
 395         /*
 396          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 397          */
 398         if (iser) {
 399                 struct iscsi_param *param;
 400                 unsigned long mrdsl, off;
 401                 int rc;
 402
 403                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 404                         return -1;
 405
 406                 /*
 407                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 408                  * Immediate Data + Unsolicited Data-OUT if necessary..
 409                  */
 410                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 411                                                   conn->param_list);
 412                 if (!param) {
 413                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 414                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 415                         return -1;
 416                 }
 417                 rc = kstrtoul(param->value, 0, &mrdsl);
 418                 if (rc < 0) {
 419                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 420                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 421                         return -1;
 422                 }
 423                 off = mrdsl % PAGE_SIZE;
 424                 if (!off)
 425                         goto check_prot;
 426
 427                 if (mrdsl < PAGE_SIZE)
 428                         mrdsl = PAGE_SIZE;
 429                 else
 430                         mrdsl -= off;
 431
 432                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 433                         " to PAGE_SIZE\n", mrdsl);
 434
 435                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 436                         return -1;
 437                 /*
 438                  * ISER currently requires that ImmediateData + Unsolicited
 439                  * Data be disabled when protection / signature MRs are enabled.
 440                  */
 441 check_prot:
 442                 if (sess->se_sess->sup_prot_ops &
 443                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 444                     TARGET_PROT_DOUT_INSERT)) {
 445
 446                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 447                                 return -1;
 448
 449                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 450                                 return -1;
 451
 452                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 453                                  " T10-PI enabled ISER session\n");
 454                 }
 455         }
 456
 457         return 0;
 458 }
 459
 460 static int iscsi_login_non_zero_tsih_s1(
 461         struct iscsi_conn *conn,
 462         unsigned char *buf)
 463 {
 464         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 465
 466         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 467 }
 468
 469 /*
 470  *      Add a new connection to an existing session.
 471  */
 472 static int iscsi_login_non_zero_tsih_s2(
 473         struct iscsi_conn *conn,
 474         unsigned char *buf)
 475 {
 476         struct iscsi_portal_group *tpg = conn->tpg;
 477         struct iscsi_session *sess = NULL, *sess_p = NULL;
 478         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 479         struct se_session *se_sess, *se_sess_tmp;
 480         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 481         bool iser = false;
 482
 483         spin_lock_bh(&se_tpg->session_lock);
 484         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 485                         sess_list) {
 486
 487                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 488                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 489                     atomic_read(&sess_p->session_logout) ||
 490                     atomic_read(&sess_p->session_close) ||
 491                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 492                         continue;
 493                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 494                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 495                         iscsit_inc_session_usage_count(sess_p);
 496                         iscsit_stop_time2retain_timer(sess_p);
 497                         sess = sess_p;
 498                         break;
 499                 }
 500         }
 501         spin_unlock_bh(&se_tpg->session_lock);
 502
 503         /*
 504          * If the Time2Retain handler has expired, the session is already gone.
 505          */
 506         if (!sess) {
 507                 pr_err("Initiator attempting to add a connection to"
 508                         " a non-existent session, rejecting iSCSI Login.\n");
 509                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 510                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 511                 return -1;
 512         }
 513
 514         /*
 515          * Stop the Time2Retain timer if this is a failed session, we restart
 516          * the timer if the login is not successful.
 517          */
 518         spin_lock_bh(&sess->conn_lock);
 519         if (sess->session_state == TARG_SESS_STATE_FAILED)
 520                 atomic_set(&sess->session_continuation, 1);
 521         spin_unlock_bh(&sess->conn_lock);
 522
 523         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 524             iscsi_copy_param_list(&conn->param_list,
 525                         conn->tpg->param_list, 0) < 0) {
 526                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 527                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 528                 return -1;
 529         }
 530
 531         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 532                 iser = true;
 533
 534         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 535         /*
 536          * Need to send TargetPortalGroupTag back in first login response
 537          * on any iSCSI connection where the Initiator provides TargetName.
 538          * See 5.3.1.  Login Phase Start
 539          *
 540          * In our case, we have already located the struct iscsi_tiqn at this point.
 541          */
 542         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 543                 return -1;
 544
 545         return 0;
 546 }
 547
 548 int iscsi_login_post_auth_non_zero_tsih(
 549         struct iscsi_conn *conn,
 550         u16 cid,
 551         u32 exp_statsn)
 552 {
 553         struct iscsi_conn *conn_ptr = NULL;
 554         struct iscsi_conn_recovery *cr = NULL;
 555         struct iscsi_session *sess = conn->sess;
 556
 557         /*
 558          * By following item 5 in the login table,  if we have found
 559          * an existing ISID and a valid/existing TSIH and an existing
 560          * CID we do connection reinstatement.  Currently we dont not
 561          * support it so we send back an non-zero status class to the
 562          * initiator and release the new connection.
 563          */
 564         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 565         if (conn_ptr) {
 566                 pr_err("Connection exists with CID %hu for %s,"
 567                         " performing connection reinstatement.\n",
 568                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 569
 570                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 571                 iscsit_dec_conn_usage_count(conn_ptr);
 572         }
 573
 574         /*
 575          * Check for any connection recovery entries containing CID.
 576          * We use the original ExpStatSN sent in the first login request
 577          * to acknowledge commands for the failed connection.
 578          *
 579          * Also note that an explict logout may have already been sent,
 580          * but the response may not be sent due to additional connection
 581          * loss.
 582          */
 583         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 584                 cr = iscsit_get_inactive_connection_recovery_entry(
 585                                 sess, cid);
 586                 if (cr) {
 587                         pr_debug("Performing implicit logout"
 588                                 " for connection recovery on CID: %hu\n",
 589                                         conn->cid);
 590                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 591                 }
 592         }
 593
 594         /*
 595          * Else we follow item 4 from the login table in that we have
 596          * found an existing ISID and a valid/existing TSIH and a new
 597          * CID we go ahead and continue to add a new connection to the
 598          * session.
 599          */
 600         pr_debug("Adding CID %hu to existing session for %s.\n",
 601                         cid, sess->sess_ops->InitiatorName);
 602
 603         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 604                 pr_err("Adding additional connection to this session"
 605                         " would exceed MaxConnections %d, login failed.\n",
 606                                 sess->sess_ops->MaxConnections);
 607                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 608                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 609                 return -1;
 610         }
 611
 612         return 0;
 613 }
 614
 615 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 616 {
 617         struct iscsi_session *sess = conn->sess;
 618         /*
 619          * FIXME: Unsolicited NopIN support for ISER
 620          */
 621         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 622                 return;
 623
 624         if (!sess->sess_ops->SessionType)
 625                 iscsit_start_nopin_timer(conn);
 626 }
 627
 628 int iscsit_start_kthreads(struct iscsi_conn *conn)
 629 {
 630         int ret = 0;
 631
 632         spin_lock(&iscsit_global->ts_bitmap_lock);
 633         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 634                                         ISCSIT_BITMAP_BITS, get_order(1));
 635         spin_unlock(&iscsit_global->ts_bitmap_lock);
 636
 637         if (conn->bitmap_id < 0) {
 638                 pr_err("bitmap_find_free_region() failed for"
 639                        " iscsit_start_kthreads()\n");
 640                 return -ENOMEM;
 641         }
 642
 643         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 644                                       "%s", ISCSI_TX_THREAD_NAME);
 645         if (IS_ERR(conn->tx_thread)) {
 646                 pr_err("Unable to start iscsi_target_tx_thread\n");
 647                 ret = PTR_ERR(conn->tx_thread);
 648                 goto out_bitmap;
 649         }
 650         conn->tx_thread_active = true;
 651
 652         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 653                                       "%s", ISCSI_RX_THREAD_NAME);
 654         if (IS_ERR(conn->rx_thread)) {
 655                 pr_err("Unable to start iscsi_target_rx_thread\n");
 656                 ret = PTR_ERR(conn->rx_thread);
 657                 goto out_tx;
 658         }
 659         conn->rx_thread_active = true;
 660
 661         return 0;
 662 out_tx:
 663         send_sig(SIGINT, conn->tx_thread, 1);
 664         kthread_stop(conn->tx_thread);
 665         conn->tx_thread_active = false;
 666 out_bitmap:
 667         spin_lock(&iscsit_global->ts_bitmap_lock);
 668         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 669                               get_order(1));
 670         spin_unlock(&iscsit_global->ts_bitmap_lock);
 671         return ret;
 672 }
 673
 674 void iscsi_post_login_handler(
 675         struct iscsi_np *np,
 676         struct iscsi_conn *conn,
 677         u8 zero_tsih)
 678 {
 679         int stop_timer = 0;
 680         struct iscsi_session *sess = conn->sess;
 681         struct se_session *se_sess = sess->se_sess;
 682         struct iscsi_portal_group *tpg = sess->tpg;
 683         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 684
 685         iscsit_inc_conn_usage_count(conn);
 686
 687         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 688                         ISCSI_LOGIN_STATUS_ACCEPT);
 689
 690         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 691         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 692
 693         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 694         /*
 695          * SCSI Initiator -> SCSI Target Port Mapping
 696          */
 697         if (!zero_tsih) {
 698                 iscsi_set_session_parameters(sess->sess_ops,
 699                                 conn->param_list, 0);
 700                 iscsi_release_param_list(conn->param_list);
 701                 conn->param_list = NULL;
 702
 703                 spin_lock_bh(&sess->conn_lock);
 704                 atomic_set(&sess->session_continuation, 0);
 705                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 706                         pr_debug("Moving to"
 707                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 708                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 709                         stop_timer = 1;
 710                 }
 711
 712                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 713                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 714                         &conn->local_sockaddr, tpg->tpgt);
 715
 716                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 717                 atomic_inc(&sess->nconn);
 718                 pr_debug("Incremented iSCSI Connection count to %hu"
 719                         " from node: %s\n", atomic_read(&sess->nconn),
 720                         sess->sess_ops->InitiatorName);
 721                 spin_unlock_bh(&sess->conn_lock);
 722
 723                 iscsi_post_login_start_timers(conn);
 724                 /*
 725                  * Determine CPU mask to ensure connection's RX and TX kthreads
 726                  * are scheduled on the same CPU.
 727                  */
 728                 iscsit_thread_get_cpumask(conn);
 729                 conn->conn_rx_reset_cpumask = 1;
 730                 conn->conn_tx_reset_cpumask = 1;
 731                 /*
 732                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 733                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 734                  */
 735                 complete(&conn->rx_login_comp);
 736                 iscsit_dec_conn_usage_count(conn);
 737
 738                 if (stop_timer) {
 739                         spin_lock_bh(&se_tpg->session_lock);
 740                         iscsit_stop_time2retain_timer(sess);
 741                         spin_unlock_bh(&se_tpg->session_lock);
 742                 }
 743                 iscsit_dec_session_usage_count(sess);
 744                 return;
 745         }
 746
 747         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 748         iscsi_release_param_list(conn->param_list);
 749         conn->param_list = NULL;
 750
 751         iscsit_determine_maxcmdsn(sess);
 752
 753         spin_lock_bh(&se_tpg->session_lock);
 754         __transport_register_session(&sess->tpg->tpg_se_tpg,
 755                         se_sess->se_node_acl, se_sess, sess);
 756         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 757         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 758
 759         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 760                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 761                 tpg->tpgt);
 762
 763         spin_lock_bh(&sess->conn_lock);
 764         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 765         atomic_inc(&sess->nconn);
 766         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 767                 " %s\n", atomic_read(&sess->nconn),
 768                 sess->sess_ops->InitiatorName);
 769         spin_unlock_bh(&sess->conn_lock);
 770
 771         sess->sid = tpg->sid++;
 772         if (!sess->sid)
 773                 sess->sid = tpg->sid++;
 774         pr_debug("Established iSCSI session from node: %s\n",
 775                         sess->sess_ops->InitiatorName);
 776
 777         tpg->nsessions++;
 778         if (tpg->tpg_tiqn)
 779                 tpg->tpg_tiqn->tiqn_nsessions++;
 780
 781         pr_debug("Incremented number of active iSCSI sessions to %u on"
 782                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 783         spin_unlock_bh(&se_tpg->session_lock);
 784
 785         iscsi_post_login_start_timers(conn);
 786         /*
 787          * Determine CPU mask to ensure connection's RX and TX kthreads
 788          * are scheduled on the same CPU.
 789          */
 790         iscsit_thread_get_cpumask(conn);
 791         conn->conn_rx_reset_cpumask = 1;
 792         conn->conn_tx_reset_cpumask = 1;
 793         /*
 794          * Wakeup the sleeping iscsi_target_rx_thread() now that
 795          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 796          */
 797         complete(&conn->rx_login_comp);
 798         iscsit_dec_conn_usage_count(conn);
 799 }
 800
 801 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 802 {
 803         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 804
 805         spin_lock_bh(&np->np_thread_lock);
 806         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 807                         &np->np_sockaddr);
 808
 809         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 810                 spin_unlock_bh(&np->np_thread_lock);
 811                 return;
 812         }
 813
 814         if (np->np_thread)
 815                 send_sig(SIGINT, np->np_thread, 1);
 816
 817         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 818         spin_unlock_bh(&np->np_thread_lock);
 819 }
 820
 821 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 822 {
 823         /*
 824          * This used the TA_LOGIN_TIMEOUT constant because at this
 825          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 826          */
 827         spin_lock_bh(&np->np_thread_lock);
 828         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 829         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 830         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 831
 832         pr_debug("Added timeout timer to iSCSI login request for"
 833                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 834         spin_unlock_bh(&np->np_thread_lock);
 835 }
 836
 837 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 838 {
 839         spin_lock_bh(&np->np_thread_lock);
 840         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 841                 spin_unlock_bh(&np->np_thread_lock);
 842                 return;
 843         }
 844         np->np_login_timer_flags |= ISCSI_TF_STOP;
 845         spin_unlock_bh(&np->np_thread_lock);
 846
 847         del_timer_sync(&np->np_login_timer);
 848
 849         spin_lock_bh(&np->np_thread_lock);
 850         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 851         spin_unlock_bh(&np->np_thread_lock);
 852 }
 853
 854 int iscsit_setup_np(
 855         struct iscsi_np *np,
 856         struct sockaddr_storage *sockaddr)
 857 {
 858         struct socket *sock = NULL;
 859         int backlog = ISCSIT_TCP_BACKLOG, ret, len;
 860
 861         switch (np->np_network_transport) {
 862         case ISCSI_TCP:
 863                 np->np_ip_proto = IPPROTO_TCP;
 864                 np->np_sock_type = SOCK_STREAM;
 865                 break;
 866         case ISCSI_SCTP_TCP:
 867                 np->np_ip_proto = IPPROTO_SCTP;
 868                 np->np_sock_type = SOCK_STREAM;
 869                 break;
 870         case ISCSI_SCTP_UDP:
 871                 np->np_ip_proto = IPPROTO_SCTP;
 872                 np->np_sock_type = SOCK_SEQPACKET;
 873                 break;
 874         default:
 875                 pr_err("Unsupported network_transport: %d\n",
 876                                 np->np_network_transport);
 877                 return -EINVAL;
 878         }
 879
 880         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 881                         np->np_ip_proto, &sock);
 882         if (ret < 0) {
 883                 pr_err("sock_create() failed.\n");
 884                 return ret;
 885         }
 886         np->np_socket = sock;
 887         /*
 888          * Setup the np->np_sockaddr from the passed sockaddr setup
 889          * in iscsi_target_configfs.c code..
 890          */
 891         memcpy(&np->np_sockaddr, sockaddr,
 892                         sizeof(struct sockaddr_storage));
 893
 894         if (sockaddr->ss_family == AF_INET6)
 895                 len = sizeof(struct sockaddr_in6);
 896         else
 897                 len = sizeof(struct sockaddr_in);
 898         /*
 899          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 900          */
 901         if (np->np_network_transport == ISCSI_TCP)
 902                 tcp_sock_set_nodelay(sock->sk);
 903         sock_set_reuseaddr(sock->sk);
 904         ip_sock_set_freebind(sock->sk);
 905
 906         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 907         if (ret < 0) {
 908                 pr_err("kernel_bind() failed: %d\n", ret);
 909                 goto fail;
 910         }
 911
 912         ret = kernel_listen(sock, backlog);
 913         if (ret != 0) {
 914                 pr_err("kernel_listen() failed: %d\n", ret);
 915                 goto fail;
 916         }
 917
 918         return 0;
 919 fail:
 920         np->np_socket = NULL;
 921         sock_release(sock);
 922         return ret;
 923 }
 924
 925 int iscsi_target_setup_login_socket(
 926         struct iscsi_np *np,
 927         struct sockaddr_storage *sockaddr)
 928 {
 929         struct iscsit_transport *t;
 930         int rc;
 931
 932         t = iscsit_get_transport(np->np_network_transport);
 933         if (!t)
 934                 return -EINVAL;
 935
 936         rc = t->iscsit_setup_np(np, sockaddr);
 937         if (rc < 0) {
 938                 iscsit_put_transport(t);
 939                 return rc;
 940         }
 941
 942         np->np_transport = t;
 943         np->enabled = true;
 944         return 0;
 945 }
 946
 947 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 948 {
 949         struct socket *new_sock, *sock = np->np_socket;
 950         struct sockaddr_in sock_in;
 951         struct sockaddr_in6 sock_in6;
 952         int rc;
 953
 954         rc = kernel_accept(sock, &new_sock, 0);
 955         if (rc < 0)
 956                 return rc;
 957
 958         conn->sock = new_sock;
 959         conn->login_family = np->np_sockaddr.ss_family;
 960
 961         if (np->np_sockaddr.ss_family == AF_INET6) {
 962                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 963
 964                 rc = conn->sock->ops->getname(conn->sock,
 965                                 (struct sockaddr *)&sock_in6, 1);
 966                 if (rc >= 0) {
 967                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 968                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
 969                         } else {
 970                                 /* Pretend to be an ipv4 socket */
 971                                 sock_in.sin_family = AF_INET;
 972                                 sock_in.sin_port = sock_in6.sin6_port;
 973                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
 974                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
 975                         }
 976                 }
 977
 978                 rc = conn->sock->ops->getname(conn->sock,
 979                                 (struct sockaddr *)&sock_in6, 0);
 980                 if (rc >= 0) {
 981                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 982                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
 983                         } else {
 984                                 /* Pretend to be an ipv4 socket */
 985                                 sock_in.sin_family = AF_INET;
 986                                 sock_in.sin_port = sock_in6.sin6_port;
 987                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
 988                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
 989                         }
 990                 }
 991         } else {
 992                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
 993
 994                 rc = conn->sock->ops->getname(conn->sock,
 995                                 (struct sockaddr *)&sock_in, 1);
 996                 if (rc >= 0)
 997                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
 998
 999                 rc = conn->sock->ops->getname(conn->sock,
1000                                 (struct sockaddr *)&sock_in, 0);
1001                 if (rc >= 0)
1002                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1003         }
1004
1005         return 0;
1006 }
1007
1008 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1009 {
1010         struct iscsi_login_req *login_req;
1011         u32 padding = 0, payload_length;
1012
1013         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1014                 return -1;
1015
1016         login_req = (struct iscsi_login_req *)login->req;
1017         payload_length  = ntoh24(login_req->dlength);
1018         padding = ((-payload_length) & 3);
1019
1020         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1021                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1022                 login_req->flags, login_req->itt, login_req->cmdsn,
1023                 login_req->exp_statsn, login_req->cid, payload_length);
1024         /*
1025          * Setup the initial iscsi_login values from the leading
1026          * login request PDU.
1027          */
1028         if (login->first_request) {
1029                 login_req = (struct iscsi_login_req *)login->req;
1030                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1031                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1032                 login->version_min      = login_req->min_version;
1033                 login->version_max      = login_req->max_version;
1034                 memcpy(login->isid, login_req->isid, 6);
1035                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1036                 login->init_task_tag    = login_req->itt;
1037                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1038                 login->cid              = be16_to_cpu(login_req->cid);
1039                 login->tsih             = be16_to_cpu(login_req->tsih);
1040         }
1041
1042         if (iscsi_target_check_login_request(conn, login) < 0)
1043                 return -1;
1044
1045         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1046         if (iscsi_login_rx_data(conn, login->req_buf,
1047                                 payload_length + padding) < 0)
1048                 return -1;
1049
1050         return 0;
1051 }
1052
1053 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1054                         u32 length)
1055 {
1056         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1057                 return -1;
1058
1059         return 0;
1060 }
1061
1062 static int
1063 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1064 {
1065         int rc;
1066
1067         if (!t->owner) {
1068                 conn->conn_transport = t;
1069                 return 0;
1070         }
1071
1072         rc = try_module_get(t->owner);
1073         if (!rc) {
1074                 pr_err("try_module_get() failed for %s\n", t->name);
1075                 return -EINVAL;
1076         }
1077
1078         conn->conn_transport = t;
1079         return 0;
1080 }
1081
1082 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1083 {
1084         struct iscsi_conn *conn;
1085
1086         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1087         if (!conn) {
1088                 pr_err("Could not allocate memory for new connection\n");
1089                 return NULL;
1090         }
1091         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1092         conn->conn_state = TARG_CONN_STATE_FREE;
1093
1094         init_waitqueue_head(&conn->queues_wq);
1095         INIT_LIST_HEAD(&conn->conn_list);
1096         INIT_LIST_HEAD(&conn->conn_cmd_list);
1097         INIT_LIST_HEAD(&conn->immed_queue_list);
1098         INIT_LIST_HEAD(&conn->response_queue_list);
1099         init_completion(&conn->conn_post_wait_comp);
1100         init_completion(&conn->conn_wait_comp);
1101         init_completion(&conn->conn_wait_rcfr_comp);
1102         init_completion(&conn->conn_waiting_on_uc_comp);
1103         init_completion(&conn->conn_logout_comp);
1104         init_completion(&conn->rx_half_close_comp);
1105         init_completion(&conn->tx_half_close_comp);
1106         init_completion(&conn->rx_login_comp);
1107         spin_lock_init(&conn->cmd_lock);
1108         spin_lock_init(&conn->conn_usage_lock);
1109         spin_lock_init(&conn->immed_queue_lock);
1110         spin_lock_init(&conn->nopin_timer_lock);
1111         spin_lock_init(&conn->response_queue_lock);
1112         spin_lock_init(&conn->state_lock);
1113
1114         timer_setup(&conn->nopin_response_timer,
1115                     iscsit_handle_nopin_response_timeout, 0);
1116         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1117
1118         if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1119                 goto free_conn;
1120
1121         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1122         if (!conn->conn_ops) {
1123                 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1124                 goto put_transport;
1125         }
1126
1127         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1128                 pr_err("Unable to allocate conn->conn_cpumask\n");
1129                 goto free_conn_ops;
1130         }
1131
1132         return conn;
1133
1134 free_conn_ops:
1135         kfree(conn->conn_ops);
1136 put_transport:
1137         iscsit_put_transport(conn->conn_transport);
1138 free_conn:
1139         kfree(conn);
1140         return NULL;
1141 }
1142
1143 void iscsit_free_conn(struct iscsi_conn *conn)
1144 {
1145         free_cpumask_var(conn->conn_cpumask);
1146         kfree(conn->conn_ops);
1147         iscsit_put_transport(conn->conn_transport);
1148         kfree(conn);
1149 }
1150
1151 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1152                                  bool zero_tsih, bool new_sess)
1153 {
1154         if (!new_sess)
1155                 goto old_sess_out;
1156
1157         pr_err("iSCSI Login negotiation failed.\n");
1158         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1159                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1160         if (!zero_tsih || !conn->sess)
1161                 goto old_sess_out;
1162
1163         transport_free_session(conn->sess->se_sess);
1164         ida_free(&sess_ida, conn->sess->session_index);
1165         kfree(conn->sess->sess_ops);
1166         kfree(conn->sess);
1167         conn->sess = NULL;
1168
1169 old_sess_out:
1170         /*
1171          * If login negotiation fails check if the Time2Retain timer
1172          * needs to be restarted.
1173          */
1174         if (!zero_tsih && conn->sess) {
1175                 spin_lock_bh(&conn->sess->conn_lock);
1176                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1177                         struct se_portal_group *se_tpg =
1178                                         &conn->tpg->tpg_se_tpg;
1179
1180                         atomic_set(&conn->sess->session_continuation, 0);
1181                         spin_unlock_bh(&conn->sess->conn_lock);
1182                         spin_lock_bh(&se_tpg->session_lock);
1183                         iscsit_start_time2retain_handler(conn->sess);
1184                         spin_unlock_bh(&se_tpg->session_lock);
1185                 } else
1186                         spin_unlock_bh(&conn->sess->conn_lock);
1187                 iscsit_dec_session_usage_count(conn->sess);
1188         }
1189
1190         ahash_request_free(conn->conn_tx_hash);
1191         if (conn->conn_rx_hash) {
1192                 struct crypto_ahash *tfm;
1193
1194                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1195                 ahash_request_free(conn->conn_rx_hash);
1196                 crypto_free_ahash(tfm);
1197         }
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_free_conn(conn);
1217 }
1218
1219 static int __iscsi_target_login_thread(struct iscsi_np *np)
1220 {
1221         u8 *buffer, zero_tsih = 0;
1222         int ret = 0, rc;
1223         struct iscsi_conn *conn = NULL;
1224         struct iscsi_login *login;
1225         struct iscsi_portal_group *tpg = NULL;
1226         struct iscsi_login_req *pdu;
1227         struct iscsi_tpg_np *tpg_np;
1228         bool new_sess = false;
1229
1230         flush_signals(current);
1231
1232         spin_lock_bh(&np->np_thread_lock);
1233         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1234                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1235                 spin_unlock_bh(&np->np_thread_lock);
1236                 complete(&np->np_restart_comp);
1237                 return 1;
1238         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1239                 spin_unlock_bh(&np->np_thread_lock);
1240                 goto exit;
1241         } else {
1242                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1243         }
1244         spin_unlock_bh(&np->np_thread_lock);
1245
1246         conn = iscsit_alloc_conn(np);
1247         if (!conn) {
1248                 /* Get another socket */
1249                 return 1;
1250         }
1251
1252         rc = np->np_transport->iscsit_accept_np(np, conn);
1253         if (rc == -ENOSYS) {
1254                 complete(&np->np_restart_comp);
1255                 iscsit_free_conn(conn);
1256                 goto exit;
1257         } else if (rc < 0) {
1258                 spin_lock_bh(&np->np_thread_lock);
1259                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1260                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1261                         spin_unlock_bh(&np->np_thread_lock);
1262                         complete(&np->np_restart_comp);
1263                         iscsit_free_conn(conn);
1264                         /* Get another socket */
1265                         return 1;
1266                 }
1267                 spin_unlock_bh(&np->np_thread_lock);
1268                 iscsit_free_conn(conn);
1269                 return 1;
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         if (conn->sess)
1361                 conn->sess->se_sess->sup_prot_ops =
1362                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1363
1364         tpg = conn->tpg;
1365         if (!tpg) {
1366                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1367                 goto new_sess_out;
1368         }
1369
1370         if (zero_tsih) {
1371                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1372                         goto new_sess_out;
1373         } else {
1374                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1375                         goto old_sess_out;
1376         }
1377
1378         if (conn->conn_transport->iscsit_validate_params) {
1379                 ret = conn->conn_transport->iscsit_validate_params(conn);
1380                 if (ret < 0) {
1381                         if (zero_tsih)
1382                                 goto new_sess_out;
1383                         else
1384                                 goto old_sess_out;
1385                 }
1386         }
1387
1388         ret = iscsi_target_start_negotiation(login, conn);
1389         if (ret < 0)
1390                 goto new_sess_out;
1391
1392         iscsi_stop_login_thread_timer(np);
1393
1394         if (ret == 1) {
1395                 tpg_np = conn->tpg_np;
1396
1397                 iscsi_post_login_handler(np, conn, zero_tsih);
1398                 iscsit_deaccess_np(np, tpg, tpg_np);
1399         }
1400
1401         tpg = NULL;
1402         tpg_np = NULL;
1403         /* Get another socket */
1404         return 1;
1405
1406 new_sess_out:
1407         new_sess = true;
1408 old_sess_out:
1409         iscsi_stop_login_thread_timer(np);
1410         tpg_np = conn->tpg_np;
1411         iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1412         new_sess = false;
1413
1414         if (tpg) {
1415                 iscsit_deaccess_np(np, tpg, tpg_np);
1416                 tpg = NULL;
1417                 tpg_np = NULL;
1418         }
1419
1420         return 1;
1421
1422 exit:
1423         iscsi_stop_login_thread_timer(np);
1424         spin_lock_bh(&np->np_thread_lock);
1425         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1426         spin_unlock_bh(&np->np_thread_lock);
1427
1428         return 0;
1429 }
1430
1431 int iscsi_target_login_thread(void *arg)
1432 {
1433         struct iscsi_np *np = arg;
1434         int ret;
1435
1436         allow_signal(SIGINT);
1437
1438         while (1) {
1439                 ret = __iscsi_target_login_thread(np);
1440                 /*
1441                  * We break and exit here unless another sock_accept() call
1442                  * is expected.
1443                  */
1444                 if (ret != 1)
1445                         break;
1446         }
1447
1448         while (!kthread_should_stop()) {
1449                 msleep(100);
1450         }
1451
1452         return 0;
1453 }