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                     atomic_read(&sess_p->session_close) ||
 203                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 204                         spin_unlock(&sess_p->conn_lock);
 205                         continue;
 206                 }
 207                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 208                    (!strcmp(sess_p->sess_ops->InitiatorName,
 209                             initiatorname_param->value) &&
 210                    (sess_p->sess_ops->SessionType == sessiontype))) {
 211                         atomic_set(&sess_p->session_reinstatement, 1);
 212                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 213                         atomic_set(&sess_p->session_close, 1);
 214                         spin_unlock(&sess_p->conn_lock);
 215                         iscsit_inc_session_usage_count(sess_p);
 216                         iscsit_stop_time2retain_timer(sess_p);
 217                         sess = sess_p;
 218                         break;
 219                 }
 220                 spin_unlock(&sess_p->conn_lock);
 221         }
 222         spin_unlock_bh(&se_tpg->session_lock);
 223         /*
 224          * If the Time2Retain handler has expired, the session is already gone.
 225          */
 226         if (!sess)
 227                 return 0;
 228
 229         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 230                 " performing session reinstatement.\n", (sessiontype) ?
 231                 "Discovery" : "Normal", sess->sid,
 232                 sess->sess_ops->InitiatorName);
 233
 234         spin_lock_bh(&sess->conn_lock);
 235         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 236                 spin_unlock_bh(&sess->conn_lock);
 237                 iscsit_dec_session_usage_count(sess);
 238                 return 0;
 239         }
 240         spin_unlock_bh(&sess->conn_lock);
 241
 242         iscsit_stop_session(sess, 1, 1);
 243         iscsit_dec_session_usage_count(sess);
 244
 245         return 0;
 246 }
 247
 248 static int iscsi_login_set_conn_values(
 249         struct iscsi_session *sess,
 250         struct iscsi_conn *conn,
 251         __be16 cid)
 252 {
 253         int ret;
 254         conn->sess              = sess;
 255         conn->cid               = be16_to_cpu(cid);
 256         /*
 257          * Generate a random Status sequence number (statsn) for the new
 258          * iSCSI connection.
 259          */
 260         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 261         if (unlikely(ret))
 262                 return ret;
 263
 264         mutex_lock(&auth_id_lock);
 265         conn->auth_id           = iscsit_global->auth_id++;
 266         mutex_unlock(&auth_id_lock);
 267         return 0;
 268 }
 269
 270 __printf(2, 3) int iscsi_change_param_sprintf(
 271         struct iscsi_conn *conn,
 272         const char *fmt, ...)
 273 {
 274         va_list args;
 275         unsigned char buf[64];
 276
 277         memset(buf, 0, sizeof buf);
 278
 279         va_start(args, fmt);
 280         vsnprintf(buf, sizeof buf, fmt, args);
 281         va_end(args);
 282
 283         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 284                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 285                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 286                 return -1;
 287         }
 288
 289         return 0;
 290 }
 291 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 292
 293 /*
 294  *      This is the leading connection of a new session,
 295  *      or session reinstatement.
 296  */
 297 static int iscsi_login_zero_tsih_s1(
 298         struct iscsi_conn *conn,
 299         unsigned char *buf)
 300 {
 301         struct iscsi_session *sess = NULL;
 302         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 303         int ret;
 304
 305         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 306         if (!sess) {
 307                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 308                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 309                 pr_err("Could not allocate memory for session\n");
 310                 return -ENOMEM;
 311         }
 312
 313         if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
 314                 goto free_sess;
 315
 316         sess->init_task_tag     = pdu->itt;
 317         memcpy(&sess->isid, pdu->isid, 6);
 318         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 319         INIT_LIST_HEAD(&sess->sess_conn_list);
 320         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 321         INIT_LIST_HEAD(&sess->cr_active_list);
 322         INIT_LIST_HEAD(&sess->cr_inactive_list);
 323         init_completion(&sess->async_msg_comp);
 324         init_completion(&sess->reinstatement_comp);
 325         init_completion(&sess->session_wait_comp);
 326         init_completion(&sess->session_waiting_on_uc_comp);
 327         mutex_init(&sess->cmdsn_mutex);
 328         spin_lock_init(&sess->conn_lock);
 329         spin_lock_init(&sess->cr_a_lock);
 330         spin_lock_init(&sess->cr_i_lock);
 331         spin_lock_init(&sess->session_usage_lock);
 332         spin_lock_init(&sess->ttt_lock);
 333
 334         idr_preload(GFP_KERNEL);
 335         spin_lock_bh(&sess_idr_lock);
 336         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 337         if (ret >= 0)
 338                 sess->session_index = ret;
 339         spin_unlock_bh(&sess_idr_lock);
 340         idr_preload_end();
 341
 342         if (ret < 0) {
 343                 pr_err("idr_alloc() for sess_idr failed\n");
 344                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 345                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 346                 goto free_sess;
 347         }
 348
 349         sess->creation_time = get_jiffies_64();
 350         /*
 351          * The FFP CmdSN window values will be allocated from the TPG's
 352          * Initiator Node's ACL once the login has been successfully completed.
 353          */
 354         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 355
 356         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 357         if (!sess->sess_ops) {
 358                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 359                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 360                 pr_err("Unable to allocate memory for"
 361                                 " struct iscsi_sess_ops.\n");
 362                 goto remove_idr;
 363         }
 364
 365         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 366         if (IS_ERR(sess->se_sess)) {
 367                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 368                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 369                 goto free_ops;
 370         }
 371
 372         return 0;
 373
 374 free_ops:
 375         kfree(sess->sess_ops);
 376 remove_idr:
 377         spin_lock_bh(&sess_idr_lock);
 378         idr_remove(&sess_idr, sess->session_index);
 379         spin_unlock_bh(&sess_idr_lock);
 380 free_sess:
 381         kfree(sess);
 382         conn->sess = NULL;
 383         return -ENOMEM;
 384 }
 385
 386 static int iscsi_login_zero_tsih_s2(
 387         struct iscsi_conn *conn)
 388 {
 389         struct iscsi_node_attrib *na;
 390         struct iscsi_session *sess = conn->sess;
 391         bool iser = false;
 392
 393         sess->tpg = conn->tpg;
 394
 395         /*
 396          * Assign a new TPG Session Handle.  Note this is protected with
 397          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 398          */
 399         sess->tsih = ++sess->tpg->ntsih;
 400         if (!sess->tsih)
 401                 sess->tsih = ++sess->tpg->ntsih;
 402
 403         /*
 404          * Create the default params from user defined values..
 405          */
 406         if (iscsi_copy_param_list(&conn->param_list,
 407                                 conn->tpg->param_list, 1) < 0) {
 408                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 409                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 410                 return -1;
 411         }
 412
 413         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 414                 iser = true;
 415
 416         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 417
 418         if (sess->sess_ops->SessionType)
 419                 return iscsi_set_keys_irrelevant_for_discovery(
 420                                 conn->param_list);
 421
 422         na = iscsit_tpg_get_node_attrib(sess);
 423
 424         /*
 425          * Need to send TargetPortalGroupTag back in first login response
 426          * on any iSCSI connection where the Initiator provides TargetName.
 427          * See 5.3.1.  Login Phase Start
 428          *
 429          * In our case, we have already located the struct iscsi_tiqn at this point.
 430          */
 431         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 432                 return -1;
 433
 434         /*
 435          * Workaround for Initiators that have broken connection recovery logic.
 436          *
 437          * "We would really like to get rid of this." Linux-iSCSI.org team
 438          */
 439         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 440                 return -1;
 441
 442         /*
 443          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 444          */
 445         if (iser) {
 446                 struct iscsi_param *param;
 447                 unsigned long mrdsl, off;
 448                 int rc;
 449
 450                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 451                         return -1;
 452
 453                 /*
 454                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 455                  * Immediate Data + Unsolicited Data-OUT if necessary..
 456                  */
 457                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 458                                                   conn->param_list);
 459                 if (!param) {
 460                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 461                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 462                         return -1;
 463                 }
 464                 rc = kstrtoul(param->value, 0, &mrdsl);
 465                 if (rc < 0) {
 466                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 467                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 468                         return -1;
 469                 }
 470                 off = mrdsl % PAGE_SIZE;
 471                 if (!off)
 472                         goto check_prot;
 473
 474                 if (mrdsl < PAGE_SIZE)
 475                         mrdsl = PAGE_SIZE;
 476                 else
 477                         mrdsl -= off;
 478
 479                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 480                         " to PAGE_SIZE\n", mrdsl);
 481
 482                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 483                         return -1;
 484                 /*
 485                  * ISER currently requires that ImmediateData + Unsolicited
 486                  * Data be disabled when protection / signature MRs are enabled.
 487                  */
 488 check_prot:
 489                 if (sess->se_sess->sup_prot_ops &
 490                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 491                     TARGET_PROT_DOUT_INSERT)) {
 492
 493                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 494                                 return -1;
 495
 496                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 497                                 return -1;
 498
 499                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 500                                  " T10-PI enabled ISER session\n");
 501                 }
 502         }
 503
 504         return 0;
 505 }
 506
 507 static int iscsi_login_non_zero_tsih_s1(
 508         struct iscsi_conn *conn,
 509         unsigned char *buf)
 510 {
 511         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 512
 513         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 514 }
 515
 516 /*
 517  *      Add a new connection to an existing session.
 518  */
 519 static int iscsi_login_non_zero_tsih_s2(
 520         struct iscsi_conn *conn,
 521         unsigned char *buf)
 522 {
 523         struct iscsi_portal_group *tpg = conn->tpg;
 524         struct iscsi_session *sess = NULL, *sess_p = NULL;
 525         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 526         struct se_session *se_sess, *se_sess_tmp;
 527         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 528         bool iser = false;
 529
 530         spin_lock_bh(&se_tpg->session_lock);
 531         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 532                         sess_list) {
 533
 534                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 535                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 536                     atomic_read(&sess_p->session_logout) ||
 537                     atomic_read(&sess_p->session_close) ||
 538                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 539                         continue;
 540                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 541                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 542                         iscsit_inc_session_usage_count(sess_p);
 543                         iscsit_stop_time2retain_timer(sess_p);
 544                         sess = sess_p;
 545                         break;
 546                 }
 547         }
 548         spin_unlock_bh(&se_tpg->session_lock);
 549
 550         /*
 551          * If the Time2Retain handler has expired, the session is already gone.
 552          */
 553         if (!sess) {
 554                 pr_err("Initiator attempting to add a connection to"
 555                         " a non-existent session, rejecting iSCSI Login.\n");
 556                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 557                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 558                 return -1;
 559         }
 560
 561         /*
 562          * Stop the Time2Retain timer if this is a failed session, we restart
 563          * the timer if the login is not successful.
 564          */
 565         spin_lock_bh(&sess->conn_lock);
 566         if (sess->session_state == TARG_SESS_STATE_FAILED)
 567                 atomic_set(&sess->session_continuation, 1);
 568         spin_unlock_bh(&sess->conn_lock);
 569
 570         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 571             iscsi_copy_param_list(&conn->param_list,
 572                         conn->tpg->param_list, 0) < 0) {
 573                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 574                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 575                 return -1;
 576         }
 577
 578         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 579                 iser = true;
 580
 581         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 582         /*
 583          * Need to send TargetPortalGroupTag back in first login response
 584          * on any iSCSI connection where the Initiator provides TargetName.
 585          * See 5.3.1.  Login Phase Start
 586          *
 587          * In our case, we have already located the struct iscsi_tiqn at this point.
 588          */
 589         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 590                 return -1;
 591
 592         return 0;
 593 }
 594
 595 int iscsi_login_post_auth_non_zero_tsih(
 596         struct iscsi_conn *conn,
 597         u16 cid,
 598         u32 exp_statsn)
 599 {
 600         struct iscsi_conn *conn_ptr = NULL;
 601         struct iscsi_conn_recovery *cr = NULL;
 602         struct iscsi_session *sess = conn->sess;
 603
 604         /*
 605          * By following item 5 in the login table,  if we have found
 606          * an existing ISID and a valid/existing TSIH and an existing
 607          * CID we do connection reinstatement.  Currently we dont not
 608          * support it so we send back an non-zero status class to the
 609          * initiator and release the new connection.
 610          */
 611         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 612         if (conn_ptr) {
 613                 pr_err("Connection exists with CID %hu for %s,"
 614                         " performing connection reinstatement.\n",
 615                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 616
 617                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 618                 iscsit_dec_conn_usage_count(conn_ptr);
 619         }
 620
 621         /*
 622          * Check for any connection recovery entires containing CID.
 623          * We use the original ExpStatSN sent in the first login request
 624          * to acknowledge commands for the failed connection.
 625          *
 626          * Also note that an explict logout may have already been sent,
 627          * but the response may not be sent due to additional connection
 628          * loss.
 629          */
 630         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 631                 cr = iscsit_get_inactive_connection_recovery_entry(
 632                                 sess, cid);
 633                 if (cr) {
 634                         pr_debug("Performing implicit logout"
 635                                 " for connection recovery on CID: %hu\n",
 636                                         conn->cid);
 637                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 638                 }
 639         }
 640
 641         /*
 642          * Else we follow item 4 from the login table in that we have
 643          * found an existing ISID and a valid/existing TSIH and a new
 644          * CID we go ahead and continue to add a new connection to the
 645          * session.
 646          */
 647         pr_debug("Adding CID %hu to existing session for %s.\n",
 648                         cid, sess->sess_ops->InitiatorName);
 649
 650         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 651                 pr_err("Adding additional connection to this session"
 652                         " would exceed MaxConnections %d, login failed.\n",
 653                                 sess->sess_ops->MaxConnections);
 654                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 655                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 656                 return -1;
 657         }
 658
 659         return 0;
 660 }
 661
 662 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 663 {
 664         struct iscsi_session *sess = conn->sess;
 665         /*
 666          * FIXME: Unsolicited NopIN support for ISER
 667          */
 668         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 669                 return;
 670
 671         if (!sess->sess_ops->SessionType)
 672                 iscsit_start_nopin_timer(conn);
 673 }
 674
 675 int iscsit_start_kthreads(struct iscsi_conn *conn)
 676 {
 677         int ret = 0;
 678
 679         spin_lock(&iscsit_global->ts_bitmap_lock);
 680         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 681                                         ISCSIT_BITMAP_BITS, get_order(1));
 682         spin_unlock(&iscsit_global->ts_bitmap_lock);
 683
 684         if (conn->bitmap_id < 0) {
 685                 pr_err("bitmap_find_free_region() failed for"
 686                        " iscsit_start_kthreads()\n");
 687                 return -ENOMEM;
 688         }
 689
 690         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 691                                       "%s", ISCSI_TX_THREAD_NAME);
 692         if (IS_ERR(conn->tx_thread)) {
 693                 pr_err("Unable to start iscsi_target_tx_thread\n");
 694                 ret = PTR_ERR(conn->tx_thread);
 695                 goto out_bitmap;
 696         }
 697         conn->tx_thread_active = true;
 698
 699         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 700                                       "%s", ISCSI_RX_THREAD_NAME);
 701         if (IS_ERR(conn->rx_thread)) {
 702                 pr_err("Unable to start iscsi_target_rx_thread\n");
 703                 ret = PTR_ERR(conn->rx_thread);
 704                 goto out_tx;
 705         }
 706         conn->rx_thread_active = true;
 707
 708         return 0;
 709 out_tx:
 710         send_sig(SIGINT, conn->tx_thread, 1);
 711         kthread_stop(conn->tx_thread);
 712         conn->tx_thread_active = false;
 713 out_bitmap:
 714         spin_lock(&iscsit_global->ts_bitmap_lock);
 715         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 716                               get_order(1));
 717         spin_unlock(&iscsit_global->ts_bitmap_lock);
 718         return ret;
 719 }
 720
 721 void iscsi_post_login_handler(
 722         struct iscsi_np *np,
 723         struct iscsi_conn *conn,
 724         u8 zero_tsih)
 725 {
 726         int stop_timer = 0;
 727         struct iscsi_session *sess = conn->sess;
 728         struct se_session *se_sess = sess->se_sess;
 729         struct iscsi_portal_group *tpg = sess->tpg;
 730         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 731
 732         iscsit_inc_conn_usage_count(conn);
 733
 734         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 735                         ISCSI_LOGIN_STATUS_ACCEPT);
 736
 737         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 738         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 739
 740         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 741         /*
 742          * SCSI Initiator -> SCSI Target Port Mapping
 743          */
 744         if (!zero_tsih) {
 745                 iscsi_set_session_parameters(sess->sess_ops,
 746                                 conn->param_list, 0);
 747                 iscsi_release_param_list(conn->param_list);
 748                 conn->param_list = NULL;
 749
 750                 spin_lock_bh(&sess->conn_lock);
 751                 atomic_set(&sess->session_continuation, 0);
 752                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 753                         pr_debug("Moving to"
 754                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 755                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 756                         stop_timer = 1;
 757                 }
 758
 759                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 760                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 761                         &conn->local_sockaddr, tpg->tpgt);
 762
 763                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 764                 atomic_inc(&sess->nconn);
 765                 pr_debug("Incremented iSCSI Connection count to %hu"
 766                         " from node: %s\n", atomic_read(&sess->nconn),
 767                         sess->sess_ops->InitiatorName);
 768                 spin_unlock_bh(&sess->conn_lock);
 769
 770                 iscsi_post_login_start_timers(conn);
 771                 /*
 772                  * Determine CPU mask to ensure connection's RX and TX kthreads
 773                  * are scheduled on the same CPU.
 774                  */
 775                 iscsit_thread_get_cpumask(conn);
 776                 conn->conn_rx_reset_cpumask = 1;
 777                 conn->conn_tx_reset_cpumask = 1;
 778                 /*
 779                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 780                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 781                  */
 782                 complete(&conn->rx_login_comp);
 783                 iscsit_dec_conn_usage_count(conn);
 784
 785                 if (stop_timer) {
 786                         spin_lock_bh(&se_tpg->session_lock);
 787                         iscsit_stop_time2retain_timer(sess);
 788                         spin_unlock_bh(&se_tpg->session_lock);
 789                 }
 790                 iscsit_dec_session_usage_count(sess);
 791                 return;
 792         }
 793
 794         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 795         iscsi_release_param_list(conn->param_list);
 796         conn->param_list = NULL;
 797
 798         iscsit_determine_maxcmdsn(sess);
 799
 800         spin_lock_bh(&se_tpg->session_lock);
 801         __transport_register_session(&sess->tpg->tpg_se_tpg,
 802                         se_sess->se_node_acl, se_sess, sess);
 803         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 804         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 805
 806         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 807                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 808                 tpg->tpgt);
 809
 810         spin_lock_bh(&sess->conn_lock);
 811         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 812         atomic_inc(&sess->nconn);
 813         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 814                 " %s\n", atomic_read(&sess->nconn),
 815                 sess->sess_ops->InitiatorName);
 816         spin_unlock_bh(&sess->conn_lock);
 817
 818         sess->sid = tpg->sid++;
 819         if (!sess->sid)
 820                 sess->sid = tpg->sid++;
 821         pr_debug("Established iSCSI session from node: %s\n",
 822                         sess->sess_ops->InitiatorName);
 823
 824         tpg->nsessions++;
 825         if (tpg->tpg_tiqn)
 826                 tpg->tpg_tiqn->tiqn_nsessions++;
 827
 828         pr_debug("Incremented number of active iSCSI sessions to %u on"
 829                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 830         spin_unlock_bh(&se_tpg->session_lock);
 831
 832         iscsi_post_login_start_timers(conn);
 833         /*
 834          * Determine CPU mask to ensure connection's RX and TX kthreads
 835          * are scheduled on the same CPU.
 836          */
 837         iscsit_thread_get_cpumask(conn);
 838         conn->conn_rx_reset_cpumask = 1;
 839         conn->conn_tx_reset_cpumask = 1;
 840         /*
 841          * Wakeup the sleeping iscsi_target_rx_thread() now that
 842          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 843          */
 844         complete(&conn->rx_login_comp);
 845         iscsit_dec_conn_usage_count(conn);
 846 }
 847
 848 static void iscsi_handle_login_thread_timeout(unsigned long data)
 849 {
 850         struct iscsi_np *np = (struct iscsi_np *) data;
 851
 852         spin_lock_bh(&np->np_thread_lock);
 853         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 854                         &np->np_sockaddr);
 855
 856         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 857                 spin_unlock_bh(&np->np_thread_lock);
 858                 return;
 859         }
 860
 861         if (np->np_thread)
 862                 send_sig(SIGINT, np->np_thread, 1);
 863
 864         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 865         spin_unlock_bh(&np->np_thread_lock);
 866 }
 867
 868 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 869 {
 870         /*
 871          * This used the TA_LOGIN_TIMEOUT constant because at this
 872          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 873          */
 874         spin_lock_bh(&np->np_thread_lock);
 875         init_timer(&np->np_login_timer);
 876         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 877         np->np_login_timer.data = (unsigned long)np;
 878         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 879         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 880         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 881         add_timer(&np->np_login_timer);
 882
 883         pr_debug("Added timeout timer to iSCSI login request for"
 884                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 885         spin_unlock_bh(&np->np_thread_lock);
 886 }
 887
 888 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 889 {
 890         spin_lock_bh(&np->np_thread_lock);
 891         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 892                 spin_unlock_bh(&np->np_thread_lock);
 893                 return;
 894         }
 895         np->np_login_timer_flags |= ISCSI_TF_STOP;
 896         spin_unlock_bh(&np->np_thread_lock);
 897
 898         del_timer_sync(&np->np_login_timer);
 899
 900         spin_lock_bh(&np->np_thread_lock);
 901         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 902         spin_unlock_bh(&np->np_thread_lock);
 903 }
 904
 905 int iscsit_setup_np(
 906         struct iscsi_np *np,
 907         struct sockaddr_storage *sockaddr)
 908 {
 909         struct socket *sock = NULL;
 910         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 911
 912         switch (np->np_network_transport) {
 913         case ISCSI_TCP:
 914                 np->np_ip_proto = IPPROTO_TCP;
 915                 np->np_sock_type = SOCK_STREAM;
 916                 break;
 917         case ISCSI_SCTP_TCP:
 918                 np->np_ip_proto = IPPROTO_SCTP;
 919                 np->np_sock_type = SOCK_STREAM;
 920                 break;
 921         case ISCSI_SCTP_UDP:
 922                 np->np_ip_proto = IPPROTO_SCTP;
 923                 np->np_sock_type = SOCK_SEQPACKET;
 924                 break;
 925         default:
 926                 pr_err("Unsupported network_transport: %d\n",
 927                                 np->np_network_transport);
 928                 return -EINVAL;
 929         }
 930
 931         np->np_ip_proto = IPPROTO_TCP;
 932         np->np_sock_type = SOCK_STREAM;
 933
 934         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 935                         np->np_ip_proto, &sock);
 936         if (ret < 0) {
 937                 pr_err("sock_create() failed.\n");
 938                 return ret;
 939         }
 940         np->np_socket = sock;
 941         /*
 942          * Setup the np->np_sockaddr from the passed sockaddr setup
 943          * in iscsi_target_configfs.c code..
 944          */
 945         memcpy(&np->np_sockaddr, sockaddr,
 946                         sizeof(struct sockaddr_storage));
 947
 948         if (sockaddr->ss_family == AF_INET6)
 949                 len = sizeof(struct sockaddr_in6);
 950         else
 951                 len = sizeof(struct sockaddr_in);
 952         /*
 953          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 954          */
 955         /* FIXME: Someone please explain why this is endian-safe */
 956         opt = 1;
 957         if (np->np_network_transport == ISCSI_TCP) {
 958                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 959                                 (char *)&opt, sizeof(opt));
 960                 if (ret < 0) {
 961                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 962                                 " failed: %d\n", ret);
 963                         goto fail;
 964                 }
 965         }
 966
 967         /* FIXME: Someone please explain why this is endian-safe */
 968         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 969                         (char *)&opt, sizeof(opt));
 970         if (ret < 0) {
 971                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 972                         " failed\n");
 973                 goto fail;
 974         }
 975
 976         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 977                         (char *)&opt, sizeof(opt));
 978         if (ret < 0) {
 979                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 980                         " failed\n");
 981                 goto fail;
 982         }
 983
 984         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 985         if (ret < 0) {
 986                 pr_err("kernel_bind() failed: %d\n", ret);
 987                 goto fail;
 988         }
 989
 990         ret = kernel_listen(sock, backlog);
 991         if (ret != 0) {
 992                 pr_err("kernel_listen() failed: %d\n", ret);
 993                 goto fail;
 994         }
 995
 996         return 0;
 997 fail:
 998         np->np_socket = NULL;
 999         sock_release(sock);
1000         return ret;
1001 }
1002
1003 int iscsi_target_setup_login_socket(
1004         struct iscsi_np *np,
1005         struct sockaddr_storage *sockaddr)
1006 {
1007         struct iscsit_transport *t;
1008         int rc;
1009
1010         t = iscsit_get_transport(np->np_network_transport);
1011         if (!t)
1012                 return -EINVAL;
1013
1014         rc = t->iscsit_setup_np(np, sockaddr);
1015         if (rc < 0) {
1016                 iscsit_put_transport(t);
1017                 return rc;
1018         }
1019
1020         np->np_transport = t;
1021         np->enabled = true;
1022         return 0;
1023 }
1024
1025 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1026 {
1027         struct socket *new_sock, *sock = np->np_socket;
1028         struct sockaddr_in sock_in;
1029         struct sockaddr_in6 sock_in6;
1030         int rc, err;
1031
1032         rc = kernel_accept(sock, &new_sock, 0);
1033         if (rc < 0)
1034                 return rc;
1035
1036         conn->sock = new_sock;
1037         conn->login_family = np->np_sockaddr.ss_family;
1038
1039         if (np->np_sockaddr.ss_family == AF_INET6) {
1040                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1041
1042                 rc = conn->sock->ops->getname(conn->sock,
1043                                 (struct sockaddr *)&sock_in6, &err, 1);
1044                 if (!rc) {
1045                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1046                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1047                         } else {
1048                                 /* Pretend to be an ipv4 socket */
1049                                 sock_in.sin_family = AF_INET;
1050                                 sock_in.sin_port = sock_in6.sin6_port;
1051                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1052                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1053                         }
1054                 }
1055
1056                 rc = conn->sock->ops->getname(conn->sock,
1057                                 (struct sockaddr *)&sock_in6, &err, 0);
1058                 if (!rc) {
1059                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1060                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1061                         } else {
1062                                 /* Pretend to be an ipv4 socket */
1063                                 sock_in.sin_family = AF_INET;
1064                                 sock_in.sin_port = sock_in6.sin6_port;
1065                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1066                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1067                         }
1068                 }
1069         } else {
1070                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1071
1072                 rc = conn->sock->ops->getname(conn->sock,
1073                                 (struct sockaddr *)&sock_in, &err, 1);
1074                 if (!rc)
1075                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1076
1077                 rc = conn->sock->ops->getname(conn->sock,
1078                                 (struct sockaddr *)&sock_in, &err, 0);
1079                 if (!rc)
1080                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1081         }
1082
1083         return 0;
1084 }
1085
1086 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1087 {
1088         struct iscsi_login_req *login_req;
1089         u32 padding = 0, payload_length;
1090
1091         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1092                 return -1;
1093
1094         login_req = (struct iscsi_login_req *)login->req;
1095         payload_length  = ntoh24(login_req->dlength);
1096         padding = ((-payload_length) & 3);
1097
1098         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1099                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1100                 login_req->flags, login_req->itt, login_req->cmdsn,
1101                 login_req->exp_statsn, login_req->cid, payload_length);
1102         /*
1103          * Setup the initial iscsi_login values from the leading
1104          * login request PDU.
1105          */
1106         if (login->first_request) {
1107                 login_req = (struct iscsi_login_req *)login->req;
1108                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1109                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1110                 login->version_min      = login_req->min_version;
1111                 login->version_max      = login_req->max_version;
1112                 memcpy(login->isid, login_req->isid, 6);
1113                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1114                 login->init_task_tag    = login_req->itt;
1115                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1116                 login->cid              = be16_to_cpu(login_req->cid);
1117                 login->tsih             = be16_to_cpu(login_req->tsih);
1118         }
1119
1120         if (iscsi_target_check_login_request(conn, login) < 0)
1121                 return -1;
1122
1123         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1124         if (iscsi_login_rx_data(conn, login->req_buf,
1125                                 payload_length + padding) < 0)
1126                 return -1;
1127
1128         return 0;
1129 }
1130
1131 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1132                         u32 length)
1133 {
1134         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1135                 return -1;
1136
1137         return 0;
1138 }
1139
1140 static int
1141 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1142 {
1143         int rc;
1144
1145         if (!t->owner) {
1146                 conn->conn_transport = t;
1147                 return 0;
1148         }
1149
1150         rc = try_module_get(t->owner);
1151         if (!rc) {
1152                 pr_err("try_module_get() failed for %s\n", t->name);
1153                 return -EINVAL;
1154         }
1155
1156         conn->conn_transport = t;
1157         return 0;
1158 }
1159
1160 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1161                                  bool zero_tsih, bool new_sess)
1162 {
1163         if (!new_sess)
1164                 goto old_sess_out;
1165
1166         pr_err("iSCSI Login negotiation failed.\n");
1167         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1168                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1169         if (!zero_tsih || !conn->sess)
1170                 goto old_sess_out;
1171
1172         transport_free_session(conn->sess->se_sess);
1173
1174         spin_lock_bh(&sess_idr_lock);
1175         idr_remove(&sess_idr, conn->sess->session_index);
1176         spin_unlock_bh(&sess_idr_lock);
1177
1178         kfree(conn->sess->sess_ops);
1179         kfree(conn->sess);
1180         conn->sess = NULL;
1181
1182 old_sess_out:
1183         /*
1184          * If login negotiation fails check if the Time2Retain timer
1185          * needs to be restarted.
1186          */
1187         if (!zero_tsih && conn->sess) {
1188                 spin_lock_bh(&conn->sess->conn_lock);
1189                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1190                         struct se_portal_group *se_tpg =
1191                                         &conn->tpg->tpg_se_tpg;
1192
1193                         atomic_set(&conn->sess->session_continuation, 0);
1194                         spin_unlock_bh(&conn->sess->conn_lock);
1195                         spin_lock_bh(&se_tpg->session_lock);
1196                         iscsit_start_time2retain_handler(conn->sess);
1197                         spin_unlock_bh(&se_tpg->session_lock);
1198                 } else
1199                         spin_unlock_bh(&conn->sess->conn_lock);
1200                 iscsit_dec_session_usage_count(conn->sess);
1201         }
1202
1203         ahash_request_free(conn->conn_tx_hash);
1204         if (conn->conn_rx_hash) {
1205                 struct crypto_ahash *tfm;
1206
1207                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1208                 ahash_request_free(conn->conn_rx_hash);
1209                 crypto_free_ahash(tfm);
1210         }
1211
1212         free_cpumask_var(conn->conn_cpumask);
1213
1214         kfree(conn->conn_ops);
1215
1216         if (conn->param_list) {
1217                 iscsi_release_param_list(conn->param_list);
1218                 conn->param_list = NULL;
1219         }
1220         iscsi_target_nego_release(conn);
1221
1222         if (conn->sock) {
1223                 sock_release(conn->sock);
1224                 conn->sock = NULL;
1225         }
1226
1227         if (conn->conn_transport->iscsit_wait_conn)
1228                 conn->conn_transport->iscsit_wait_conn(conn);
1229
1230         if (conn->conn_transport->iscsit_free_conn)
1231                 conn->conn_transport->iscsit_free_conn(conn);
1232
1233         iscsit_put_transport(conn->conn_transport);
1234         kfree(conn);
1235 }
1236
1237 static int __iscsi_target_login_thread(struct iscsi_np *np)
1238 {
1239         u8 *buffer, zero_tsih = 0;
1240         int ret = 0, rc;
1241         struct iscsi_conn *conn = NULL;
1242         struct iscsi_login *login;
1243         struct iscsi_portal_group *tpg = NULL;
1244         struct iscsi_login_req *pdu;
1245         struct iscsi_tpg_np *tpg_np;
1246         bool new_sess = false;
1247
1248         flush_signals(current);
1249
1250         spin_lock_bh(&np->np_thread_lock);
1251         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1252                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1253                 spin_unlock_bh(&np->np_thread_lock);
1254                 complete(&np->np_restart_comp);
1255                 return 1;
1256         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1257                 spin_unlock_bh(&np->np_thread_lock);
1258                 goto exit;
1259         } else {
1260                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1261         }
1262         spin_unlock_bh(&np->np_thread_lock);
1263
1264         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1265         if (!conn) {
1266                 pr_err("Could not allocate memory for"
1267                         " new connection\n");
1268                 /* Get another socket */
1269                 return 1;
1270         }
1271         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1272         conn->conn_state = TARG_CONN_STATE_FREE;
1273
1274         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1275                 kfree(conn);
1276                 return 1;
1277         }
1278
1279         rc = np->np_transport->iscsit_accept_np(np, conn);
1280         if (rc == -ENOSYS) {
1281                 complete(&np->np_restart_comp);
1282                 iscsit_put_transport(conn->conn_transport);
1283                 kfree(conn);
1284                 conn = NULL;
1285                 goto exit;
1286         } else if (rc < 0) {
1287                 spin_lock_bh(&np->np_thread_lock);
1288                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1289                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1290                         spin_unlock_bh(&np->np_thread_lock);
1291                         complete(&np->np_restart_comp);
1292                         iscsit_put_transport(conn->conn_transport);
1293                         kfree(conn);
1294                         conn = NULL;
1295                         /* Get another socket */
1296                         return 1;
1297                 }
1298                 spin_unlock_bh(&np->np_thread_lock);
1299                 iscsit_put_transport(conn->conn_transport);
1300                 kfree(conn);
1301                 conn = NULL;
1302                 goto out;
1303         }
1304         /*
1305          * Perform the remaining iSCSI connection initialization items..
1306          */
1307         login = iscsi_login_init_conn(conn);
1308         if (!login) {
1309                 goto new_sess_out;
1310         }
1311
1312         iscsi_start_login_thread_timer(np);
1313
1314         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1315         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1316         /*
1317          * This will process the first login request + payload..
1318          */
1319         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1320         if (rc == 1)
1321                 return 1;
1322         else if (rc < 0)
1323                 goto new_sess_out;
1324
1325         buffer = &login->req[0];
1326         pdu = (struct iscsi_login_req *)buffer;
1327         /*
1328          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1329          * when Status-Class != 0.
1330         */
1331         conn->login_itt = pdu->itt;
1332
1333         spin_lock_bh(&np->np_thread_lock);
1334         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1335                 spin_unlock_bh(&np->np_thread_lock);
1336                 pr_err("iSCSI Network Portal on %pISpc currently not"
1337                         " active.\n", &np->np_sockaddr);
1338                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1339                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1340                 goto new_sess_out;
1341         }
1342         spin_unlock_bh(&np->np_thread_lock);
1343
1344         conn->network_transport = np->np_network_transport;
1345
1346         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1347                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1348                 &conn->local_sockaddr);
1349
1350         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1351         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1352
1353         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1354                         pdu->min_version) < 0)
1355                 goto new_sess_out;
1356
1357         zero_tsih = (pdu->tsih == 0x0000);
1358         if (zero_tsih) {
1359                 /*
1360                  * This is the leading connection of a new session.
1361                  * We wait until after authentication to check for
1362                  * session reinstatement.
1363                  */
1364                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1365                         goto new_sess_out;
1366         } else {
1367                 /*
1368                  * Add a new connection to an existing session.
1369                  * We check for a non-existant session in
1370                  * iscsi_login_non_zero_tsih_s2() below based
1371                  * on ISID/TSIH, but wait until after authentication
1372                  * to check for connection reinstatement, etc.
1373                  */
1374                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1375                         goto new_sess_out;
1376         }
1377         /*
1378          * SessionType: Discovery
1379          *
1380          *      Locates Default Portal
1381          *
1382          * SessionType: Normal
1383          *
1384          *      Locates Target Portal from NP -> Target IQN
1385          */
1386         rc = iscsi_target_locate_portal(np, conn, login);
1387         if (rc < 0) {
1388                 tpg = conn->tpg;
1389                 goto new_sess_out;
1390         }
1391         login->zero_tsih = zero_tsih;
1392
1393         if (conn->sess)
1394                 conn->sess->se_sess->sup_prot_ops =
1395                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1396
1397         tpg = conn->tpg;
1398         if (!tpg) {
1399                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1400                 goto new_sess_out;
1401         }
1402
1403         if (zero_tsih) {
1404                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1405                         goto new_sess_out;
1406         } else {
1407                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1408                         goto old_sess_out;
1409         }
1410
1411         if (conn->conn_transport->iscsit_validate_params) {
1412                 ret = conn->conn_transport->iscsit_validate_params(conn);
1413                 if (ret < 0) {
1414                         if (zero_tsih)
1415                                 goto new_sess_out;
1416                         else
1417                                 goto old_sess_out;
1418                 }
1419         }
1420
1421         ret = iscsi_target_start_negotiation(login, conn);
1422         if (ret < 0)
1423                 goto new_sess_out;
1424
1425         iscsi_stop_login_thread_timer(np);
1426
1427         if (ret == 1) {
1428                 tpg_np = conn->tpg_np;
1429
1430                 iscsi_post_login_handler(np, conn, zero_tsih);
1431                 iscsit_deaccess_np(np, tpg, tpg_np);
1432         }
1433
1434         tpg = NULL;
1435         tpg_np = NULL;
1436         /* Get another socket */
1437         return 1;
1438
1439 new_sess_out:
1440         new_sess = true;
1441 old_sess_out:
1442         iscsi_stop_login_thread_timer(np);
1443         tpg_np = conn->tpg_np;
1444         iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1445         new_sess = false;
1446
1447         if (tpg) {
1448                 iscsit_deaccess_np(np, tpg, tpg_np);
1449                 tpg = NULL;
1450                 tpg_np = NULL;
1451         }
1452
1453 out:
1454         return 1;
1455
1456 exit:
1457         iscsi_stop_login_thread_timer(np);
1458         spin_lock_bh(&np->np_thread_lock);
1459         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1460         spin_unlock_bh(&np->np_thread_lock);
1461
1462         return 0;
1463 }
1464
1465 int iscsi_target_login_thread(void *arg)
1466 {
1467         struct iscsi_np *np = arg;
1468         int ret;
1469
1470         allow_signal(SIGINT);
1471
1472         while (1) {
1473                 ret = __iscsi_target_login_thread(np);
1474                 /*
1475                  * We break and exit here unless another sock_accept() call
1476                  * is expected.
1477                  */
1478                 if (ret != 1)
1479                         break;
1480         }
1481
1482         while (!kthread_should_stop()) {
1483                 msleep(100);
1484         }
1485
1486         return 0;
1487 }