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/module.h>
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/sched/signal.h>
  24 #include <linux/idr.h>
  25 #include <linux/tcp.h>        /* TCP_NODELAY */
  26 #include <net/ipv6.h>         /* ipv6_addr_v4mapped() */
  27 #include <scsi/iscsi_proto.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30
  31 #include <target/iscsi/iscsi_target_core.h>
  32 #include <target/iscsi/iscsi_target_stat.h>
  33 #include "iscsi_target_device.h"
  34 #include "iscsi_target_nego.h"
  35 #include "iscsi_target_erl0.h"
  36 #include "iscsi_target_erl2.h"
  37 #include "iscsi_target_login.h"
  38 #include "iscsi_target_tpg.h"
  39 #include "iscsi_target_util.h"
  40 #include "iscsi_target.h"
  41 #include "iscsi_target_parameters.h"
  42
  43 #include <target/iscsi/iscsi_transport.h>
  44
  45 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  46 {
  47         struct iscsi_login *login;
  48
  49         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  50         if (!login) {
  51                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  52                 return NULL;
  53         }
  54         conn->login = login;
  55         login->conn = conn;
  56         login->first_request = 1;
  57
  58         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  59         if (!login->req_buf) {
  60                 pr_err("Unable to allocate memory for response buffer.\n");
  61                 goto out_login;
  62         }
  63
  64         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  65         if (!login->rsp_buf) {
  66                 pr_err("Unable to allocate memory for request buffer.\n");
  67                 goto out_req_buf;
  68         }
  69
  70         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  71         if (!conn->conn_ops) {
  72                 pr_err("Unable to allocate memory for"
  73                         " struct iscsi_conn_ops.\n");
  74                 goto out_rsp_buf;
  75         }
  76
  77         init_waitqueue_head(&conn->queues_wq);
  78         INIT_LIST_HEAD(&conn->conn_list);
  79         INIT_LIST_HEAD(&conn->conn_cmd_list);
  80         INIT_LIST_HEAD(&conn->immed_queue_list);
  81         INIT_LIST_HEAD(&conn->response_queue_list);
  82         init_completion(&conn->conn_post_wait_comp);
  83         init_completion(&conn->conn_wait_comp);
  84         init_completion(&conn->conn_wait_rcfr_comp);
  85         init_completion(&conn->conn_waiting_on_uc_comp);
  86         init_completion(&conn->conn_logout_comp);
  87         init_completion(&conn->rx_half_close_comp);
  88         init_completion(&conn->tx_half_close_comp);
  89         init_completion(&conn->rx_login_comp);
  90         spin_lock_init(&conn->cmd_lock);
  91         spin_lock_init(&conn->conn_usage_lock);
  92         spin_lock_init(&conn->immed_queue_lock);
  93         spin_lock_init(&conn->nopin_timer_lock);
  94         spin_lock_init(&conn->response_queue_lock);
  95         spin_lock_init(&conn->state_lock);
  96
  97         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  98                 pr_err("Unable to allocate conn->conn_cpumask\n");
  99                 goto out_conn_ops;
 100         }
 101         conn->conn_login = login;
 102
 103         return login;
 104
 105 out_conn_ops:
 106         kfree(conn->conn_ops);
 107 out_rsp_buf:
 108         kfree(login->rsp_buf);
 109 out_req_buf:
 110         kfree(login->req_buf);
 111 out_login:
 112         kfree(login);
 113         return NULL;
 114 }
 115
 116 /*
 117  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 118  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 119  */
 120 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 121 {
 122         struct crypto_ahash *tfm;
 123
 124         /*
 125          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 126          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 127          * to software 1x8 byte slicing from crc32c.ko
 128          */
 129         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
 130         if (IS_ERR(tfm)) {
 131                 pr_err("crypto_alloc_ahash() failed\n");
 132                 return -ENOMEM;
 133         }
 134
 135         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 136         if (!conn->conn_rx_hash) {
 137                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
 138                 crypto_free_ahash(tfm);
 139                 return -ENOMEM;
 140         }
 141         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
 142
 143         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 144         if (!conn->conn_tx_hash) {
 145                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 146                 ahash_request_free(conn->conn_rx_hash);
 147                 conn->conn_rx_hash = NULL;
 148                 crypto_free_ahash(tfm);
 149                 return -ENOMEM;
 150         }
 151         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 152
 153         return 0;
 154 }
 155
 156 static int iscsi_login_check_initiator_version(
 157         struct iscsi_conn *conn,
 158         u8 version_max,
 159         u8 version_min)
 160 {
 161         if ((version_max != 0x00) || (version_min != 0x00)) {
 162                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 163                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 164                         version_min, version_max);
 165                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 166                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 167                 return -1;
 168         }
 169
 170         return 0;
 171 }
 172
 173 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 174 {
 175         int sessiontype;
 176         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 177         struct iscsi_portal_group *tpg = conn->tpg;
 178         struct iscsi_session *sess = NULL, *sess_p = NULL;
 179         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 180         struct se_session *se_sess, *se_sess_tmp;
 181
 182         initiatorname_param = iscsi_find_param_from_key(
 183                         INITIATORNAME, conn->param_list);
 184         sessiontype_param = iscsi_find_param_from_key(
 185                         SESSIONTYPE, conn->param_list);
 186         if (!initiatorname_param || !sessiontype_param) {
 187                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 188                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 189                 return -1;
 190         }
 191
 192         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 193
 194         spin_lock_bh(&se_tpg->session_lock);
 195         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 196                         sess_list) {
 197
 198                 sess_p = se_sess->fabric_sess_ptr;
 199                 spin_lock(&sess_p->conn_lock);
 200                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 201                     atomic_read(&sess_p->session_logout) ||
 202                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 203                         spin_unlock(&sess_p->conn_lock);
 204                         continue;
 205                 }
 206                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 207                    (!strcmp(sess_p->sess_ops->InitiatorName,
 208                             initiatorname_param->value) &&
 209                    (sess_p->sess_ops->SessionType == sessiontype))) {
 210                         atomic_set(&sess_p->session_reinstatement, 1);
 211                         spin_unlock(&sess_p->conn_lock);
 212                         iscsit_inc_session_usage_count(sess_p);
 213                         iscsit_stop_time2retain_timer(sess_p);
 214                         sess = sess_p;
 215                         break;
 216                 }
 217                 spin_unlock(&sess_p->conn_lock);
 218         }
 219         spin_unlock_bh(&se_tpg->session_lock);
 220         /*
 221          * If the Time2Retain handler has expired, the session is already gone.
 222          */
 223         if (!sess)
 224                 return 0;
 225
 226         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 227                 " performing session reinstatement.\n", (sessiontype) ?
 228                 "Discovery" : "Normal", sess->sid,
 229                 sess->sess_ops->InitiatorName);
 230
 231         spin_lock_bh(&sess->conn_lock);
 232         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 233                 spin_unlock_bh(&sess->conn_lock);
 234                 iscsit_dec_session_usage_count(sess);
 235                 iscsit_close_session(sess);
 236                 return 0;
 237         }
 238         spin_unlock_bh(&sess->conn_lock);
 239
 240         iscsit_stop_session(sess, 1, 1);
 241         iscsit_dec_session_usage_count(sess);
 242
 243         iscsit_close_session(sess);
 244         return 0;
 245 }
 246
 247 static void iscsi_login_set_conn_values(
 248         struct iscsi_session *sess,
 249         struct iscsi_conn *conn,
 250         __be16 cid)
 251 {
 252         conn->sess              = sess;
 253         conn->cid               = be16_to_cpu(cid);
 254         /*
 255          * Generate a random Status sequence number (statsn) for the new
 256          * iSCSI connection.
 257          */
 258         get_random_bytes(&conn->stat_sn, sizeof(u32));
 259
 260         mutex_lock(&auth_id_lock);
 261         conn->auth_id           = iscsit_global->auth_id++;
 262         mutex_unlock(&auth_id_lock);
 263 }
 264
 265 __printf(2, 3) int iscsi_change_param_sprintf(
 266         struct iscsi_conn *conn,
 267         const char *fmt, ...)
 268 {
 269         va_list args;
 270         unsigned char buf[64];
 271
 272         memset(buf, 0, sizeof buf);
 273
 274         va_start(args, fmt);
 275         vsnprintf(buf, sizeof buf, fmt, args);
 276         va_end(args);
 277
 278         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 279                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 280                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 281                 return -1;
 282         }
 283
 284         return 0;
 285 }
 286 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 287
 288 /*
 289  *      This is the leading connection of a new session,
 290  *      or session reinstatement.
 291  */
 292 static int iscsi_login_zero_tsih_s1(
 293         struct iscsi_conn *conn,
 294         unsigned char *buf)
 295 {
 296         struct iscsi_session *sess = NULL;
 297         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 298         int ret;
 299
 300         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 301         if (!sess) {
 302                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 303                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 304                 pr_err("Could not allocate memory for session\n");
 305                 return -ENOMEM;
 306         }
 307
 308         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 309         sess->init_task_tag     = pdu->itt;
 310         memcpy(&sess->isid, pdu->isid, 6);
 311         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 312         INIT_LIST_HEAD(&sess->sess_conn_list);
 313         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 314         INIT_LIST_HEAD(&sess->cr_active_list);
 315         INIT_LIST_HEAD(&sess->cr_inactive_list);
 316         init_completion(&sess->async_msg_comp);
 317         init_completion(&sess->reinstatement_comp);
 318         init_completion(&sess->session_wait_comp);
 319         init_completion(&sess->session_waiting_on_uc_comp);
 320         mutex_init(&sess->cmdsn_mutex);
 321         spin_lock_init(&sess->conn_lock);
 322         spin_lock_init(&sess->cr_a_lock);
 323         spin_lock_init(&sess->cr_i_lock);
 324         spin_lock_init(&sess->session_usage_lock);
 325         spin_lock_init(&sess->ttt_lock);
 326
 327         idr_preload(GFP_KERNEL);
 328         spin_lock_bh(&sess_idr_lock);
 329         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 330         if (ret >= 0)
 331                 sess->session_index = ret;
 332         spin_unlock_bh(&sess_idr_lock);
 333         idr_preload_end();
 334
 335         if (ret < 0) {
 336                 pr_err("idr_alloc() for sess_idr failed\n");
 337                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 338                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 339                 kfree(sess);
 340                 return -ENOMEM;
 341         }
 342
 343         sess->creation_time = get_jiffies_64();
 344         /*
 345          * The FFP CmdSN window values will be allocated from the TPG's
 346          * Initiator Node's ACL once the login has been successfully completed.
 347          */
 348         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 349
 350         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 351         if (!sess->sess_ops) {
 352                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 353                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 354                 pr_err("Unable to allocate memory for"
 355                                 " struct iscsi_sess_ops.\n");
 356                 kfree(sess);
 357                 return -ENOMEM;
 358         }
 359
 360         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 361         if (IS_ERR(sess->se_sess)) {
 362                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 363                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 364                 kfree(sess->sess_ops);
 365                 kfree(sess);
 366                 return -ENOMEM;
 367         }
 368
 369         return 0;
 370 }
 371
 372 static int iscsi_login_zero_tsih_s2(
 373         struct iscsi_conn *conn)
 374 {
 375         struct iscsi_node_attrib *na;
 376         struct iscsi_session *sess = conn->sess;
 377         bool iser = false;
 378
 379         sess->tpg = conn->tpg;
 380
 381         /*
 382          * Assign a new TPG Session Handle.  Note this is protected with
 383          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 384          */
 385         sess->tsih = ++sess->tpg->ntsih;
 386         if (!sess->tsih)
 387                 sess->tsih = ++sess->tpg->ntsih;
 388
 389         /*
 390          * Create the default params from user defined values..
 391          */
 392         if (iscsi_copy_param_list(&conn->param_list,
 393                                 conn->tpg->param_list, 1) < 0) {
 394                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 395                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 396                 return -1;
 397         }
 398
 399         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 400                 iser = true;
 401
 402         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 403
 404         if (sess->sess_ops->SessionType)
 405                 return iscsi_set_keys_irrelevant_for_discovery(
 406                                 conn->param_list);
 407
 408         na = iscsit_tpg_get_node_attrib(sess);
 409
 410         /*
 411          * Need to send TargetPortalGroupTag back in first login response
 412          * on any iSCSI connection where the Initiator provides TargetName.
 413          * See 5.3.1.  Login Phase Start
 414          *
 415          * In our case, we have already located the struct iscsi_tiqn at this point.
 416          */
 417         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 418                 return -1;
 419
 420         /*
 421          * Workaround for Initiators that have broken connection recovery logic.
 422          *
 423          * "We would really like to get rid of this." Linux-iSCSI.org team
 424          */
 425         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 426                 return -1;
 427
 428         /*
 429          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 430          */
 431         if (iser) {
 432                 struct iscsi_param *param;
 433                 unsigned long mrdsl, off;
 434                 int rc;
 435
 436                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 437                         return -1;
 438
 439                 /*
 440                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 441                  * Immediate Data + Unsolicited Data-OUT if necessary..
 442                  */
 443                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 444                                                   conn->param_list);
 445                 if (!param) {
 446                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 447                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 448                         return -1;
 449                 }
 450                 rc = kstrtoul(param->value, 0, &mrdsl);
 451                 if (rc < 0) {
 452                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 453                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 454                         return -1;
 455                 }
 456                 off = mrdsl % PAGE_SIZE;
 457                 if (!off)
 458                         goto check_prot;
 459
 460                 if (mrdsl < PAGE_SIZE)
 461                         mrdsl = PAGE_SIZE;
 462                 else
 463                         mrdsl -= off;
 464
 465                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 466                         " to PAGE_SIZE\n", mrdsl);
 467
 468                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 469                         return -1;
 470                 /*
 471                  * ISER currently requires that ImmediateData + Unsolicited
 472                  * Data be disabled when protection / signature MRs are enabled.
 473                  */
 474 check_prot:
 475                 if (sess->se_sess->sup_prot_ops &
 476                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 477                     TARGET_PROT_DOUT_INSERT)) {
 478
 479                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 480                                 return -1;
 481
 482                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 483                                 return -1;
 484
 485                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 486                                  " T10-PI enabled ISER session\n");
 487                 }
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int iscsi_login_non_zero_tsih_s1(
 494         struct iscsi_conn *conn,
 495         unsigned char *buf)
 496 {
 497         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 498
 499         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 500         return 0;
 501 }
 502
 503 /*
 504  *      Add a new connection to an existing session.
 505  */
 506 static int iscsi_login_non_zero_tsih_s2(
 507         struct iscsi_conn *conn,
 508         unsigned char *buf)
 509 {
 510         struct iscsi_portal_group *tpg = conn->tpg;
 511         struct iscsi_session *sess = NULL, *sess_p = NULL;
 512         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 513         struct se_session *se_sess, *se_sess_tmp;
 514         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 515         bool iser = false;
 516
 517         spin_lock_bh(&se_tpg->session_lock);
 518         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 519                         sess_list) {
 520
 521                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 522                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 523                     atomic_read(&sess_p->session_logout) ||
 524                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 525                         continue;
 526                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 527                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 528                         iscsit_inc_session_usage_count(sess_p);
 529                         iscsit_stop_time2retain_timer(sess_p);
 530                         sess = sess_p;
 531                         break;
 532                 }
 533         }
 534         spin_unlock_bh(&se_tpg->session_lock);
 535
 536         /*
 537          * If the Time2Retain handler has expired, the session is already gone.
 538          */
 539         if (!sess) {
 540                 pr_err("Initiator attempting to add a connection to"
 541                         " a non-existent session, rejecting iSCSI Login.\n");
 542                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 543                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 544                 return -1;
 545         }
 546
 547         /*
 548          * Stop the Time2Retain timer if this is a failed session, we restart
 549          * the timer if the login is not successful.
 550          */
 551         spin_lock_bh(&sess->conn_lock);
 552         if (sess->session_state == TARG_SESS_STATE_FAILED)
 553                 atomic_set(&sess->session_continuation, 1);
 554         spin_unlock_bh(&sess->conn_lock);
 555
 556         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 557
 558         if (iscsi_copy_param_list(&conn->param_list,
 559                         conn->tpg->param_list, 0) < 0) {
 560                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 561                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 562                 return -1;
 563         }
 564
 565         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 566                 iser = true;
 567
 568         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 569         /*
 570          * Need to send TargetPortalGroupTag back in first login response
 571          * on any iSCSI connection where the Initiator provides TargetName.
 572          * See 5.3.1.  Login Phase Start
 573          *
 574          * In our case, we have already located the struct iscsi_tiqn at this point.
 575          */
 576         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 577                 return -1;
 578
 579         return 0;
 580 }
 581
 582 int iscsi_login_post_auth_non_zero_tsih(
 583         struct iscsi_conn *conn,
 584         u16 cid,
 585         u32 exp_statsn)
 586 {
 587         struct iscsi_conn *conn_ptr = NULL;
 588         struct iscsi_conn_recovery *cr = NULL;
 589         struct iscsi_session *sess = conn->sess;
 590
 591         /*
 592          * By following item 5 in the login table,  if we have found
 593          * an existing ISID and a valid/existing TSIH and an existing
 594          * CID we do connection reinstatement.  Currently we dont not
 595          * support it so we send back an non-zero status class to the
 596          * initiator and release the new connection.
 597          */
 598         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 599         if (conn_ptr) {
 600                 pr_err("Connection exists with CID %hu for %s,"
 601                         " performing connection reinstatement.\n",
 602                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 603
 604                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 605                 iscsit_dec_conn_usage_count(conn_ptr);
 606         }
 607
 608         /*
 609          * Check for any connection recovery entires containing CID.
 610          * We use the original ExpStatSN sent in the first login request
 611          * to acknowledge commands for the failed connection.
 612          *
 613          * Also note that an explict logout may have already been sent,
 614          * but the response may not be sent due to additional connection
 615          * loss.
 616          */
 617         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 618                 cr = iscsit_get_inactive_connection_recovery_entry(
 619                                 sess, cid);
 620                 if (cr) {
 621                         pr_debug("Performing implicit logout"
 622                                 " for connection recovery on CID: %hu\n",
 623                                         conn->cid);
 624                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 625                 }
 626         }
 627
 628         /*
 629          * Else we follow item 4 from the login table in that we have
 630          * found an existing ISID and a valid/existing TSIH and a new
 631          * CID we go ahead and continue to add a new connection to the
 632          * session.
 633          */
 634         pr_debug("Adding CID %hu to existing session for %s.\n",
 635                         cid, sess->sess_ops->InitiatorName);
 636
 637         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 638                 pr_err("Adding additional connection to this session"
 639                         " would exceed MaxConnections %d, login failed.\n",
 640                                 sess->sess_ops->MaxConnections);
 641                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 642                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 643                 return -1;
 644         }
 645
 646         return 0;
 647 }
 648
 649 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 650 {
 651         struct iscsi_session *sess = conn->sess;
 652         /*
 653          * FIXME: Unsolicited NopIN support for ISER
 654          */
 655         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 656                 return;
 657
 658         if (!sess->sess_ops->SessionType)
 659                 iscsit_start_nopin_timer(conn);
 660 }
 661
 662 int iscsit_start_kthreads(struct iscsi_conn *conn)
 663 {
 664         int ret = 0;
 665
 666         spin_lock(&iscsit_global->ts_bitmap_lock);
 667         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 668                                         ISCSIT_BITMAP_BITS, get_order(1));
 669         spin_unlock(&iscsit_global->ts_bitmap_lock);
 670
 671         if (conn->bitmap_id < 0) {
 672                 pr_err("bitmap_find_free_region() failed for"
 673                        " iscsit_start_kthreads()\n");
 674                 return -ENOMEM;
 675         }
 676
 677         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 678                                       "%s", ISCSI_TX_THREAD_NAME);
 679         if (IS_ERR(conn->tx_thread)) {
 680                 pr_err("Unable to start iscsi_target_tx_thread\n");
 681                 ret = PTR_ERR(conn->tx_thread);
 682                 goto out_bitmap;
 683         }
 684         conn->tx_thread_active = true;
 685
 686         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 687                                       "%s", ISCSI_RX_THREAD_NAME);
 688         if (IS_ERR(conn->rx_thread)) {
 689                 pr_err("Unable to start iscsi_target_rx_thread\n");
 690                 ret = PTR_ERR(conn->rx_thread);
 691                 goto out_tx;
 692         }
 693         conn->rx_thread_active = true;
 694
 695         return 0;
 696 out_tx:
 697         send_sig(SIGINT, conn->tx_thread, 1);
 698         kthread_stop(conn->tx_thread);
 699         conn->tx_thread_active = false;
 700 out_bitmap:
 701         spin_lock(&iscsit_global->ts_bitmap_lock);
 702         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 703                               get_order(1));
 704         spin_unlock(&iscsit_global->ts_bitmap_lock);
 705         return ret;
 706 }
 707
 708 void iscsi_post_login_handler(
 709         struct iscsi_np *np,
 710         struct iscsi_conn *conn,
 711         u8 zero_tsih)
 712 {
 713         int stop_timer = 0;
 714         struct iscsi_session *sess = conn->sess;
 715         struct se_session *se_sess = sess->se_sess;
 716         struct iscsi_portal_group *tpg = sess->tpg;
 717         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 718
 719         iscsit_inc_conn_usage_count(conn);
 720
 721         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 722                         ISCSI_LOGIN_STATUS_ACCEPT);
 723
 724         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 725         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 726
 727         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 728         /*
 729          * SCSI Initiator -> SCSI Target Port Mapping
 730          */
 731         if (!zero_tsih) {
 732                 iscsi_set_session_parameters(sess->sess_ops,
 733                                 conn->param_list, 0);
 734                 iscsi_release_param_list(conn->param_list);
 735                 conn->param_list = NULL;
 736
 737                 spin_lock_bh(&sess->conn_lock);
 738                 atomic_set(&sess->session_continuation, 0);
 739                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 740                         pr_debug("Moving to"
 741                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 742                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 743                         stop_timer = 1;
 744                 }
 745
 746                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 747                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 748                         &conn->local_sockaddr, tpg->tpgt);
 749
 750                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 751                 atomic_inc(&sess->nconn);
 752                 pr_debug("Incremented iSCSI Connection count to %hu"
 753                         " from node: %s\n", atomic_read(&sess->nconn),
 754                         sess->sess_ops->InitiatorName);
 755                 spin_unlock_bh(&sess->conn_lock);
 756
 757                 iscsi_post_login_start_timers(conn);
 758                 /*
 759                  * Determine CPU mask to ensure connection's RX and TX kthreads
 760                  * are scheduled on the same CPU.
 761                  */
 762                 iscsit_thread_get_cpumask(conn);
 763                 conn->conn_rx_reset_cpumask = 1;
 764                 conn->conn_tx_reset_cpumask = 1;
 765                 /*
 766                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 767                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 768                  */
 769                 complete(&conn->rx_login_comp);
 770                 iscsit_dec_conn_usage_count(conn);
 771
 772                 if (stop_timer) {
 773                         spin_lock_bh(&se_tpg->session_lock);
 774                         iscsit_stop_time2retain_timer(sess);
 775                         spin_unlock_bh(&se_tpg->session_lock);
 776                 }
 777                 iscsit_dec_session_usage_count(sess);
 778                 return;
 779         }
 780
 781         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 782         iscsi_release_param_list(conn->param_list);
 783         conn->param_list = NULL;
 784
 785         iscsit_determine_maxcmdsn(sess);
 786
 787         spin_lock_bh(&se_tpg->session_lock);
 788         __transport_register_session(&sess->tpg->tpg_se_tpg,
 789                         se_sess->se_node_acl, se_sess, sess);
 790         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 791         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 792
 793         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 794                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 795                 tpg->tpgt);
 796
 797         spin_lock_bh(&sess->conn_lock);
 798         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 799         atomic_inc(&sess->nconn);
 800         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 801                 " %s\n", atomic_read(&sess->nconn),
 802                 sess->sess_ops->InitiatorName);
 803         spin_unlock_bh(&sess->conn_lock);
 804
 805         sess->sid = tpg->sid++;
 806         if (!sess->sid)
 807                 sess->sid = tpg->sid++;
 808         pr_debug("Established iSCSI session from node: %s\n",
 809                         sess->sess_ops->InitiatorName);
 810
 811         tpg->nsessions++;
 812         if (tpg->tpg_tiqn)
 813                 tpg->tpg_tiqn->tiqn_nsessions++;
 814
 815         pr_debug("Incremented number of active iSCSI sessions to %u on"
 816                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 817         spin_unlock_bh(&se_tpg->session_lock);
 818
 819         iscsi_post_login_start_timers(conn);
 820         /*
 821          * Determine CPU mask to ensure connection's RX and TX kthreads
 822          * are scheduled on the same CPU.
 823          */
 824         iscsit_thread_get_cpumask(conn);
 825         conn->conn_rx_reset_cpumask = 1;
 826         conn->conn_tx_reset_cpumask = 1;
 827         /*
 828          * Wakeup the sleeping iscsi_target_rx_thread() now that
 829          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 830          */
 831         complete(&conn->rx_login_comp);
 832         iscsit_dec_conn_usage_count(conn);
 833 }
 834
 835 static void iscsi_handle_login_thread_timeout(unsigned long data)
 836 {
 837         struct iscsi_np *np = (struct iscsi_np *) data;
 838
 839         spin_lock_bh(&np->np_thread_lock);
 840         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 841                         &np->np_sockaddr);
 842
 843         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 844                 spin_unlock_bh(&np->np_thread_lock);
 845                 return;
 846         }
 847
 848         if (np->np_thread)
 849                 send_sig(SIGINT, np->np_thread, 1);
 850
 851         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 852         spin_unlock_bh(&np->np_thread_lock);
 853 }
 854
 855 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 856 {
 857         /*
 858          * This used the TA_LOGIN_TIMEOUT constant because at this
 859          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 860          */
 861         spin_lock_bh(&np->np_thread_lock);
 862         init_timer(&np->np_login_timer);
 863         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 864         np->np_login_timer.data = (unsigned long)np;
 865         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 866         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 867         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 868         add_timer(&np->np_login_timer);
 869
 870         pr_debug("Added timeout timer to iSCSI login request for"
 871                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 872         spin_unlock_bh(&np->np_thread_lock);
 873 }
 874
 875 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 876 {
 877         spin_lock_bh(&np->np_thread_lock);
 878         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 879                 spin_unlock_bh(&np->np_thread_lock);
 880                 return;
 881         }
 882         np->np_login_timer_flags |= ISCSI_TF_STOP;
 883         spin_unlock_bh(&np->np_thread_lock);
 884
 885         del_timer_sync(&np->np_login_timer);
 886
 887         spin_lock_bh(&np->np_thread_lock);
 888         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 889         spin_unlock_bh(&np->np_thread_lock);
 890 }
 891
 892 int iscsit_setup_np(
 893         struct iscsi_np *np,
 894         struct sockaddr_storage *sockaddr)
 895 {
 896         struct socket *sock = NULL;
 897         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 898
 899         switch (np->np_network_transport) {
 900         case ISCSI_TCP:
 901                 np->np_ip_proto = IPPROTO_TCP;
 902                 np->np_sock_type = SOCK_STREAM;
 903                 break;
 904         case ISCSI_SCTP_TCP:
 905                 np->np_ip_proto = IPPROTO_SCTP;
 906                 np->np_sock_type = SOCK_STREAM;
 907                 break;
 908         case ISCSI_SCTP_UDP:
 909                 np->np_ip_proto = IPPROTO_SCTP;
 910                 np->np_sock_type = SOCK_SEQPACKET;
 911                 break;
 912         default:
 913                 pr_err("Unsupported network_transport: %d\n",
 914                                 np->np_network_transport);
 915                 return -EINVAL;
 916         }
 917
 918         np->np_ip_proto = IPPROTO_TCP;
 919         np->np_sock_type = SOCK_STREAM;
 920
 921         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 922                         np->np_ip_proto, &sock);
 923         if (ret < 0) {
 924                 pr_err("sock_create() failed.\n");
 925                 return ret;
 926         }
 927         np->np_socket = sock;
 928         /*
 929          * Setup the np->np_sockaddr from the passed sockaddr setup
 930          * in iscsi_target_configfs.c code..
 931          */
 932         memcpy(&np->np_sockaddr, sockaddr,
 933                         sizeof(struct sockaddr_storage));
 934
 935         if (sockaddr->ss_family == AF_INET6)
 936                 len = sizeof(struct sockaddr_in6);
 937         else
 938                 len = sizeof(struct sockaddr_in);
 939         /*
 940          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 941          */
 942         /* FIXME: Someone please explain why this is endian-safe */
 943         opt = 1;
 944         if (np->np_network_transport == ISCSI_TCP) {
 945                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 946                                 (char *)&opt, sizeof(opt));
 947                 if (ret < 0) {
 948                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 949                                 " failed: %d\n", ret);
 950                         goto fail;
 951                 }
 952         }
 953
 954         /* FIXME: Someone please explain why this is endian-safe */
 955         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 956                         (char *)&opt, sizeof(opt));
 957         if (ret < 0) {
 958                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 959                         " failed\n");
 960                 goto fail;
 961         }
 962
 963         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 964                         (char *)&opt, sizeof(opt));
 965         if (ret < 0) {
 966                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 967                         " failed\n");
 968                 goto fail;
 969         }
 970
 971         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 972         if (ret < 0) {
 973                 pr_err("kernel_bind() failed: %d\n", ret);
 974                 goto fail;
 975         }
 976
 977         ret = kernel_listen(sock, backlog);
 978         if (ret != 0) {
 979                 pr_err("kernel_listen() failed: %d\n", ret);
 980                 goto fail;
 981         }
 982
 983         return 0;
 984 fail:
 985         np->np_socket = NULL;
 986         sock_release(sock);
 987         return ret;
 988 }
 989
 990 int iscsi_target_setup_login_socket(
 991         struct iscsi_np *np,
 992         struct sockaddr_storage *sockaddr)
 993 {
 994         struct iscsit_transport *t;
 995         int rc;
 996
 997         t = iscsit_get_transport(np->np_network_transport);
 998         if (!t)
 999                 return -EINVAL;
1000
1001         rc = t->iscsit_setup_np(np, sockaddr);
1002         if (rc < 0) {
1003                 iscsit_put_transport(t);
1004                 return rc;
1005         }
1006
1007         np->np_transport = t;
1008         np->enabled = true;
1009         return 0;
1010 }
1011
1012 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1013 {
1014         struct socket *new_sock, *sock = np->np_socket;
1015         struct sockaddr_in sock_in;
1016         struct sockaddr_in6 sock_in6;
1017         int rc, err;
1018
1019         rc = kernel_accept(sock, &new_sock, 0);
1020         if (rc < 0)
1021                 return rc;
1022
1023         conn->sock = new_sock;
1024         conn->login_family = np->np_sockaddr.ss_family;
1025
1026         if (np->np_sockaddr.ss_family == AF_INET6) {
1027                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1028
1029                 rc = conn->sock->ops->getname(conn->sock,
1030                                 (struct sockaddr *)&sock_in6, &err, 1);
1031                 if (!rc) {
1032                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1033                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1034                         } else {
1035                                 /* Pretend to be an ipv4 socket */
1036                                 sock_in.sin_family = AF_INET;
1037                                 sock_in.sin_port = sock_in6.sin6_port;
1038                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1039                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1040                         }
1041                 }
1042
1043                 rc = conn->sock->ops->getname(conn->sock,
1044                                 (struct sockaddr *)&sock_in6, &err, 0);
1045                 if (!rc) {
1046                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1047                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1048                         } else {
1049                                 /* Pretend to be an ipv4 socket */
1050                                 sock_in.sin_family = AF_INET;
1051                                 sock_in.sin_port = sock_in6.sin6_port;
1052                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1053                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1054                         }
1055                 }
1056         } else {
1057                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1058
1059                 rc = conn->sock->ops->getname(conn->sock,
1060                                 (struct sockaddr *)&sock_in, &err, 1);
1061                 if (!rc)
1062                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1063
1064                 rc = conn->sock->ops->getname(conn->sock,
1065                                 (struct sockaddr *)&sock_in, &err, 0);
1066                 if (!rc)
1067                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1068         }
1069
1070         return 0;
1071 }
1072
1073 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1074 {
1075         struct iscsi_login_req *login_req;
1076         u32 padding = 0, payload_length;
1077
1078         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1079                 return -1;
1080
1081         login_req = (struct iscsi_login_req *)login->req;
1082         payload_length  = ntoh24(login_req->dlength);
1083         padding = ((-payload_length) & 3);
1084
1085         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1086                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1087                 login_req->flags, login_req->itt, login_req->cmdsn,
1088                 login_req->exp_statsn, login_req->cid, payload_length);
1089         /*
1090          * Setup the initial iscsi_login values from the leading
1091          * login request PDU.
1092          */
1093         if (login->first_request) {
1094                 login_req = (struct iscsi_login_req *)login->req;
1095                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1096                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1097                 login->version_min      = login_req->min_version;
1098                 login->version_max      = login_req->max_version;
1099                 memcpy(login->isid, login_req->isid, 6);
1100                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1101                 login->init_task_tag    = login_req->itt;
1102                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1103                 login->cid              = be16_to_cpu(login_req->cid);
1104                 login->tsih             = be16_to_cpu(login_req->tsih);
1105         }
1106
1107         if (iscsi_target_check_login_request(conn, login) < 0)
1108                 return -1;
1109
1110         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1111         if (iscsi_login_rx_data(conn, login->req_buf,
1112                                 payload_length + padding) < 0)
1113                 return -1;
1114
1115         return 0;
1116 }
1117
1118 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1119                         u32 length)
1120 {
1121         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1122                 return -1;
1123
1124         return 0;
1125 }
1126
1127 static int
1128 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1129 {
1130         int rc;
1131
1132         if (!t->owner) {
1133                 conn->conn_transport = t;
1134                 return 0;
1135         }
1136
1137         rc = try_module_get(t->owner);
1138         if (!rc) {
1139                 pr_err("try_module_get() failed for %s\n", t->name);
1140                 return -EINVAL;
1141         }
1142
1143         conn->conn_transport = t;
1144         return 0;
1145 }
1146
1147 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1148                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1149 {
1150         if (!new_sess)
1151                 goto old_sess_out;
1152
1153         pr_err("iSCSI Login negotiation failed.\n");
1154         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1155                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1156         if (!zero_tsih || !conn->sess)
1157                 goto old_sess_out;
1158         if (conn->sess->se_sess)
1159                 transport_free_session(conn->sess->se_sess);
1160         if (conn->sess->session_index != 0) {
1161                 spin_lock_bh(&sess_idr_lock);
1162                 idr_remove(&sess_idr, conn->sess->session_index);
1163                 spin_unlock_bh(&sess_idr_lock);
1164         }
1165         kfree(conn->sess->sess_ops);
1166         kfree(conn->sess);
1167         conn->sess = NULL;
1168
1169 old_sess_out:
1170         iscsi_stop_login_thread_timer(np);
1171         /*
1172          * If login negotiation fails check if the Time2Retain timer
1173          * needs to be restarted.
1174          */
1175         if (!zero_tsih && conn->sess) {
1176                 spin_lock_bh(&conn->sess->conn_lock);
1177                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1178                         struct se_portal_group *se_tpg =
1179                                         &conn->tpg->tpg_se_tpg;
1180
1181                         atomic_set(&conn->sess->session_continuation, 0);
1182                         spin_unlock_bh(&conn->sess->conn_lock);
1183                         spin_lock_bh(&se_tpg->session_lock);
1184                         iscsit_start_time2retain_handler(conn->sess);
1185                         spin_unlock_bh(&se_tpg->session_lock);
1186                 } else
1187                         spin_unlock_bh(&conn->sess->conn_lock);
1188                 iscsit_dec_session_usage_count(conn->sess);
1189         }
1190
1191         ahash_request_free(conn->conn_tx_hash);
1192         if (conn->conn_rx_hash) {
1193                 struct crypto_ahash *tfm;
1194
1195                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1196                 ahash_request_free(conn->conn_rx_hash);
1197                 crypto_free_ahash(tfm);
1198         }
1199
1200         free_cpumask_var(conn->conn_cpumask);
1201
1202         kfree(conn->conn_ops);
1203
1204         if (conn->param_list) {
1205                 iscsi_release_param_list(conn->param_list);
1206                 conn->param_list = NULL;
1207         }
1208         iscsi_target_nego_release(conn);
1209
1210         if (conn->sock) {
1211                 sock_release(conn->sock);
1212                 conn->sock = NULL;
1213         }
1214
1215         if (conn->conn_transport->iscsit_wait_conn)
1216                 conn->conn_transport->iscsit_wait_conn(conn);
1217
1218         if (conn->conn_transport->iscsit_free_conn)
1219                 conn->conn_transport->iscsit_free_conn(conn);
1220
1221         iscsit_put_transport(conn->conn_transport);
1222         kfree(conn);
1223 }
1224
1225 static int __iscsi_target_login_thread(struct iscsi_np *np)
1226 {
1227         u8 *buffer, zero_tsih = 0;
1228         int ret = 0, rc;
1229         struct iscsi_conn *conn = NULL;
1230         struct iscsi_login *login;
1231         struct iscsi_portal_group *tpg = NULL;
1232         struct iscsi_login_req *pdu;
1233         struct iscsi_tpg_np *tpg_np;
1234         bool new_sess = false;
1235
1236         flush_signals(current);
1237
1238         spin_lock_bh(&np->np_thread_lock);
1239         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1240                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1241                 complete(&np->np_restart_comp);
1242         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1243                 spin_unlock_bh(&np->np_thread_lock);
1244                 goto exit;
1245         } else {
1246                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1247         }
1248         spin_unlock_bh(&np->np_thread_lock);
1249
1250         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1251         if (!conn) {
1252                 pr_err("Could not allocate memory for"
1253                         " new connection\n");
1254                 /* Get another socket */
1255                 return 1;
1256         }
1257         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1258         conn->conn_state = TARG_CONN_STATE_FREE;
1259
1260         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1261                 kfree(conn);
1262                 return 1;
1263         }
1264
1265         rc = np->np_transport->iscsit_accept_np(np, conn);
1266         if (rc == -ENOSYS) {
1267                 complete(&np->np_restart_comp);
1268                 iscsit_put_transport(conn->conn_transport);
1269                 kfree(conn);
1270                 conn = NULL;
1271                 goto exit;
1272         } else if (rc < 0) {
1273                 spin_lock_bh(&np->np_thread_lock);
1274                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1275                         spin_unlock_bh(&np->np_thread_lock);
1276                         complete(&np->np_restart_comp);
1277                         iscsit_put_transport(conn->conn_transport);
1278                         kfree(conn);
1279                         conn = NULL;
1280                         /* Get another socket */
1281                         return 1;
1282                 }
1283                 spin_unlock_bh(&np->np_thread_lock);
1284                 iscsit_put_transport(conn->conn_transport);
1285                 kfree(conn);
1286                 conn = NULL;
1287                 goto out;
1288         }
1289         /*
1290          * Perform the remaining iSCSI connection initialization items..
1291          */
1292         login = iscsi_login_init_conn(conn);
1293         if (!login) {
1294                 goto new_sess_out;
1295         }
1296
1297         iscsi_start_login_thread_timer(np);
1298
1299         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1300         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1301         /*
1302          * This will process the first login request + payload..
1303          */
1304         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1305         if (rc == 1)
1306                 return 1;
1307         else if (rc < 0)
1308                 goto new_sess_out;
1309
1310         buffer = &login->req[0];
1311         pdu = (struct iscsi_login_req *)buffer;
1312         /*
1313          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1314          * when Status-Class != 0.
1315         */
1316         conn->login_itt = pdu->itt;
1317
1318         spin_lock_bh(&np->np_thread_lock);
1319         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1320                 spin_unlock_bh(&np->np_thread_lock);
1321                 pr_err("iSCSI Network Portal on %pISpc currently not"
1322                         " active.\n", &np->np_sockaddr);
1323                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1324                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1325                 goto new_sess_out;
1326         }
1327         spin_unlock_bh(&np->np_thread_lock);
1328
1329         conn->network_transport = np->np_network_transport;
1330
1331         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1332                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1333                 &conn->local_sockaddr);
1334
1335         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1336         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1337
1338         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1339                         pdu->min_version) < 0)
1340                 goto new_sess_out;
1341
1342         zero_tsih = (pdu->tsih == 0x0000);
1343         if (zero_tsih) {
1344                 /*
1345                  * This is the leading connection of a new session.
1346                  * We wait until after authentication to check for
1347                  * session reinstatement.
1348                  */
1349                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1350                         goto new_sess_out;
1351         } else {
1352                 /*
1353                  * Add a new connection to an existing session.
1354                  * We check for a non-existant session in
1355                  * iscsi_login_non_zero_tsih_s2() below based
1356                  * on ISID/TSIH, but wait until after authentication
1357                  * to check for connection reinstatement, etc.
1358                  */
1359                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1360                         goto new_sess_out;
1361         }
1362         /*
1363          * SessionType: Discovery
1364          *
1365          *      Locates Default Portal
1366          *
1367          * SessionType: Normal
1368          *
1369          *      Locates Target Portal from NP -> Target IQN
1370          */
1371         rc = iscsi_target_locate_portal(np, conn, login);
1372         if (rc < 0) {
1373                 tpg = conn->tpg;
1374                 goto new_sess_out;
1375         }
1376         login->zero_tsih = zero_tsih;
1377
1378         if (conn->sess)
1379                 conn->sess->se_sess->sup_prot_ops =
1380                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1381
1382         tpg = conn->tpg;
1383         if (!tpg) {
1384                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1385                 goto new_sess_out;
1386         }
1387
1388         if (zero_tsih) {
1389                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1390                         goto new_sess_out;
1391         } else {
1392                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1393                         goto old_sess_out;
1394         }
1395
1396         if (conn->conn_transport->iscsit_validate_params) {
1397                 ret = conn->conn_transport->iscsit_validate_params(conn);
1398                 if (ret < 0) {
1399                         if (zero_tsih)
1400                                 goto new_sess_out;
1401                         else
1402                                 goto old_sess_out;
1403                 }
1404         }
1405
1406         ret = iscsi_target_start_negotiation(login, conn);
1407         if (ret < 0)
1408                 goto new_sess_out;
1409
1410         iscsi_stop_login_thread_timer(np);
1411
1412         if (ret == 1) {
1413                 tpg_np = conn->tpg_np;
1414
1415                 iscsi_post_login_handler(np, conn, zero_tsih);
1416                 iscsit_deaccess_np(np, tpg, tpg_np);
1417         }
1418
1419         tpg = NULL;
1420         tpg_np = NULL;
1421         /* Get another socket */
1422         return 1;
1423
1424 new_sess_out:
1425         new_sess = true;
1426 old_sess_out:
1427         tpg_np = conn->tpg_np;
1428         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1429         new_sess = false;
1430
1431         if (tpg) {
1432                 iscsit_deaccess_np(np, tpg, tpg_np);
1433                 tpg = NULL;
1434                 tpg_np = NULL;
1435         }
1436
1437 out:
1438         return 1;
1439
1440 exit:
1441         iscsi_stop_login_thread_timer(np);
1442         spin_lock_bh(&np->np_thread_lock);
1443         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1444         spin_unlock_bh(&np->np_thread_lock);
1445
1446         return 0;
1447 }
1448
1449 int iscsi_target_login_thread(void *arg)
1450 {
1451         struct iscsi_np *np = arg;
1452         int ret;
1453
1454         allow_signal(SIGINT);
1455
1456         while (1) {
1457                 ret = __iscsi_target_login_thread(np);
1458                 /*
1459                  * We break and exit here unless another sock_accept() call
1460                  * is expected.
1461                  */
1462                 if (ret != 1)
1463                         break;
1464         }
1465
1466         return 0;
1467 }