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                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 212                         spin_unlock(&sess_p->conn_lock);
 213                         iscsit_inc_session_usage_count(sess_p);
 214                         iscsit_stop_time2retain_timer(sess_p);
 215                         sess = sess_p;
 216                         break;
 217                 }
 218                 spin_unlock(&sess_p->conn_lock);
 219         }
 220         spin_unlock_bh(&se_tpg->session_lock);
 221         /*
 222          * If the Time2Retain handler has expired, the session is already gone.
 223          */
 224         if (!sess)
 225                 return 0;
 226
 227         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 228                 " performing session reinstatement.\n", (sessiontype) ?
 229                 "Discovery" : "Normal", sess->sid,
 230                 sess->sess_ops->InitiatorName);
 231
 232         spin_lock_bh(&sess->conn_lock);
 233         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 234                 spin_unlock_bh(&sess->conn_lock);
 235                 iscsit_dec_session_usage_count(sess);
 236                 iscsit_close_session(sess);
 237                 return 0;
 238         }
 239         spin_unlock_bh(&sess->conn_lock);
 240
 241         iscsit_stop_session(sess, 1, 1);
 242         iscsit_dec_session_usage_count(sess);
 243
 244         iscsit_close_session(sess);
 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         ret = iscsi_login_set_conn_values(sess, conn, pdu->cid);
 314         if (unlikely(ret)) {
 315                 kfree(sess);
 316                 return ret;
 317         }
 318         sess->init_task_tag     = pdu->itt;
 319         memcpy(&sess->isid, pdu->isid, 6);
 320         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 321         INIT_LIST_HEAD(&sess->sess_conn_list);
 322         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 323         INIT_LIST_HEAD(&sess->cr_active_list);
 324         INIT_LIST_HEAD(&sess->cr_inactive_list);
 325         init_completion(&sess->async_msg_comp);
 326         init_completion(&sess->reinstatement_comp);
 327         init_completion(&sess->session_wait_comp);
 328         init_completion(&sess->session_waiting_on_uc_comp);
 329         mutex_init(&sess->cmdsn_mutex);
 330         spin_lock_init(&sess->conn_lock);
 331         spin_lock_init(&sess->cr_a_lock);
 332         spin_lock_init(&sess->cr_i_lock);
 333         spin_lock_init(&sess->session_usage_lock);
 334         spin_lock_init(&sess->ttt_lock);
 335
 336         timer_setup(&sess->time2retain_timer,
 337                     iscsit_handle_time2retain_timeout, 0);
 338
 339         idr_preload(GFP_KERNEL);
 340         spin_lock_bh(&sess_idr_lock);
 341         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 342         if (ret >= 0)
 343                 sess->session_index = ret;
 344         spin_unlock_bh(&sess_idr_lock);
 345         idr_preload_end();
 346
 347         if (ret < 0) {
 348                 pr_err("idr_alloc() for sess_idr failed\n");
 349                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 350                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 351                 kfree(sess);
 352                 return -ENOMEM;
 353         }
 354
 355         sess->creation_time = get_jiffies_64();
 356         /*
 357          * The FFP CmdSN window values will be allocated from the TPG's
 358          * Initiator Node's ACL once the login has been successfully completed.
 359          */
 360         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 361
 362         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 363         if (!sess->sess_ops) {
 364                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 365                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 366                 pr_err("Unable to allocate memory for"
 367                                 " struct iscsi_sess_ops.\n");
 368                 kfree(sess);
 369                 return -ENOMEM;
 370         }
 371
 372         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 373         if (IS_ERR(sess->se_sess)) {
 374                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 375                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 376                 kfree(sess->sess_ops);
 377                 kfree(sess);
 378                 return -ENOMEM;
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int iscsi_login_zero_tsih_s2(
 385         struct iscsi_conn *conn)
 386 {
 387         struct iscsi_node_attrib *na;
 388         struct iscsi_session *sess = conn->sess;
 389         bool iser = false;
 390
 391         sess->tpg = conn->tpg;
 392
 393         /*
 394          * Assign a new TPG Session Handle.  Note this is protected with
 395          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 396          */
 397         sess->tsih = ++sess->tpg->ntsih;
 398         if (!sess->tsih)
 399                 sess->tsih = ++sess->tpg->ntsih;
 400
 401         /*
 402          * Create the default params from user defined values..
 403          */
 404         if (iscsi_copy_param_list(&conn->param_list,
 405                                 conn->tpg->param_list, 1) < 0) {
 406                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 407                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 408                 return -1;
 409         }
 410
 411         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 412                 iser = true;
 413
 414         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 415
 416         if (sess->sess_ops->SessionType)
 417                 return iscsi_set_keys_irrelevant_for_discovery(
 418                                 conn->param_list);
 419
 420         na = iscsit_tpg_get_node_attrib(sess);
 421
 422         /*
 423          * Need to send TargetPortalGroupTag back in first login response
 424          * on any iSCSI connection where the Initiator provides TargetName.
 425          * See 5.3.1.  Login Phase Start
 426          *
 427          * In our case, we have already located the struct iscsi_tiqn at this point.
 428          */
 429         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 430                 return -1;
 431
 432         /*
 433          * Workaround for Initiators that have broken connection recovery logic.
 434          *
 435          * "We would really like to get rid of this." Linux-iSCSI.org team
 436          */
 437         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 438                 return -1;
 439
 440         /*
 441          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 442          */
 443         if (iser) {
 444                 struct iscsi_param *param;
 445                 unsigned long mrdsl, off;
 446                 int rc;
 447
 448                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 449                         return -1;
 450
 451                 /*
 452                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 453                  * Immediate Data + Unsolicited Data-OUT if necessary..
 454                  */
 455                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 456                                                   conn->param_list);
 457                 if (!param) {
 458                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 459                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 460                         return -1;
 461                 }
 462                 rc = kstrtoul(param->value, 0, &mrdsl);
 463                 if (rc < 0) {
 464                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 465                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 466                         return -1;
 467                 }
 468                 off = mrdsl % PAGE_SIZE;
 469                 if (!off)
 470                         goto check_prot;
 471
 472                 if (mrdsl < PAGE_SIZE)
 473                         mrdsl = PAGE_SIZE;
 474                 else
 475                         mrdsl -= off;
 476
 477                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 478                         " to PAGE_SIZE\n", mrdsl);
 479
 480                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 481                         return -1;
 482                 /*
 483                  * ISER currently requires that ImmediateData + Unsolicited
 484                  * Data be disabled when protection / signature MRs are enabled.
 485                  */
 486 check_prot:
 487                 if (sess->se_sess->sup_prot_ops &
 488                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 489                     TARGET_PROT_DOUT_INSERT)) {
 490
 491                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 492                                 return -1;
 493
 494                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 495                                 return -1;
 496
 497                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 498                                  " T10-PI enabled ISER session\n");
 499                 }
 500         }
 501
 502         return 0;
 503 }
 504
 505 static int iscsi_login_non_zero_tsih_s1(
 506         struct iscsi_conn *conn,
 507         unsigned char *buf)
 508 {
 509         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 510
 511         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 512 }
 513
 514 /*
 515  *      Add a new connection to an existing session.
 516  */
 517 static int iscsi_login_non_zero_tsih_s2(
 518         struct iscsi_conn *conn,
 519         unsigned char *buf)
 520 {
 521         struct iscsi_portal_group *tpg = conn->tpg;
 522         struct iscsi_session *sess = NULL, *sess_p = NULL;
 523         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 524         struct se_session *se_sess, *se_sess_tmp;
 525         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 526         bool iser = false;
 527
 528         spin_lock_bh(&se_tpg->session_lock);
 529         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 530                         sess_list) {
 531
 532                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 533                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 534                     atomic_read(&sess_p->session_logout) ||
 535                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 536                         continue;
 537                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 538                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 539                         iscsit_inc_session_usage_count(sess_p);
 540                         iscsit_stop_time2retain_timer(sess_p);
 541                         sess = sess_p;
 542                         break;
 543                 }
 544         }
 545         spin_unlock_bh(&se_tpg->session_lock);
 546
 547         /*
 548          * If the Time2Retain handler has expired, the session is already gone.
 549          */
 550         if (!sess) {
 551                 pr_err("Initiator attempting to add a connection to"
 552                         " a non-existent session, rejecting iSCSI Login.\n");
 553                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 554                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 555                 return -1;
 556         }
 557
 558         /*
 559          * Stop the Time2Retain timer if this is a failed session, we restart
 560          * the timer if the login is not successful.
 561          */
 562         spin_lock_bh(&sess->conn_lock);
 563         if (sess->session_state == TARG_SESS_STATE_FAILED)
 564                 atomic_set(&sess->session_continuation, 1);
 565         spin_unlock_bh(&sess->conn_lock);
 566
 567         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 568             iscsi_copy_param_list(&conn->param_list,
 569                         conn->tpg->param_list, 0) < 0) {
 570                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 571                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 572                 return -1;
 573         }
 574
 575         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 576                 iser = true;
 577
 578         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 579         /*
 580          * Need to send TargetPortalGroupTag back in first login response
 581          * on any iSCSI connection where the Initiator provides TargetName.
 582          * See 5.3.1.  Login Phase Start
 583          *
 584          * In our case, we have already located the struct iscsi_tiqn at this point.
 585          */
 586         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 587                 return -1;
 588
 589         return 0;
 590 }
 591
 592 int iscsi_login_post_auth_non_zero_tsih(
 593         struct iscsi_conn *conn,
 594         u16 cid,
 595         u32 exp_statsn)
 596 {
 597         struct iscsi_conn *conn_ptr = NULL;
 598         struct iscsi_conn_recovery *cr = NULL;
 599         struct iscsi_session *sess = conn->sess;
 600
 601         /*
 602          * By following item 5 in the login table,  if we have found
 603          * an existing ISID and a valid/existing TSIH and an existing
 604          * CID we do connection reinstatement.  Currently we dont not
 605          * support it so we send back an non-zero status class to the
 606          * initiator and release the new connection.
 607          */
 608         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 609         if (conn_ptr) {
 610                 pr_err("Connection exists with CID %hu for %s,"
 611                         " performing connection reinstatement.\n",
 612                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 613
 614                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 615                 iscsit_dec_conn_usage_count(conn_ptr);
 616         }
 617
 618         /*
 619          * Check for any connection recovery entires containing CID.
 620          * We use the original ExpStatSN sent in the first login request
 621          * to acknowledge commands for the failed connection.
 622          *
 623          * Also note that an explict logout may have already been sent,
 624          * but the response may not be sent due to additional connection
 625          * loss.
 626          */
 627         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 628                 cr = iscsit_get_inactive_connection_recovery_entry(
 629                                 sess, cid);
 630                 if (cr) {
 631                         pr_debug("Performing implicit logout"
 632                                 " for connection recovery on CID: %hu\n",
 633                                         conn->cid);
 634                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 635                 }
 636         }
 637
 638         /*
 639          * Else we follow item 4 from the login table in that we have
 640          * found an existing ISID and a valid/existing TSIH and a new
 641          * CID we go ahead and continue to add a new connection to the
 642          * session.
 643          */
 644         pr_debug("Adding CID %hu to existing session for %s.\n",
 645                         cid, sess->sess_ops->InitiatorName);
 646
 647         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 648                 pr_err("Adding additional connection to this session"
 649                         " would exceed MaxConnections %d, login failed.\n",
 650                                 sess->sess_ops->MaxConnections);
 651                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 652                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 660 {
 661         struct iscsi_session *sess = conn->sess;
 662         /*
 663          * FIXME: Unsolicited NopIN support for ISER
 664          */
 665         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 666                 return;
 667
 668         if (!sess->sess_ops->SessionType)
 669                 iscsit_start_nopin_timer(conn);
 670 }
 671
 672 int iscsit_start_kthreads(struct iscsi_conn *conn)
 673 {
 674         int ret = 0;
 675
 676         spin_lock(&iscsit_global->ts_bitmap_lock);
 677         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 678                                         ISCSIT_BITMAP_BITS, get_order(1));
 679         spin_unlock(&iscsit_global->ts_bitmap_lock);
 680
 681         if (conn->bitmap_id < 0) {
 682                 pr_err("bitmap_find_free_region() failed for"
 683                        " iscsit_start_kthreads()\n");
 684                 return -ENOMEM;
 685         }
 686
 687         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 688                                       "%s", ISCSI_TX_THREAD_NAME);
 689         if (IS_ERR(conn->tx_thread)) {
 690                 pr_err("Unable to start iscsi_target_tx_thread\n");
 691                 ret = PTR_ERR(conn->tx_thread);
 692                 goto out_bitmap;
 693         }
 694         conn->tx_thread_active = true;
 695
 696         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 697                                       "%s", ISCSI_RX_THREAD_NAME);
 698         if (IS_ERR(conn->rx_thread)) {
 699                 pr_err("Unable to start iscsi_target_rx_thread\n");
 700                 ret = PTR_ERR(conn->rx_thread);
 701                 goto out_tx;
 702         }
 703         conn->rx_thread_active = true;
 704
 705         return 0;
 706 out_tx:
 707         send_sig(SIGINT, conn->tx_thread, 1);
 708         kthread_stop(conn->tx_thread);
 709         conn->tx_thread_active = false;
 710 out_bitmap:
 711         spin_lock(&iscsit_global->ts_bitmap_lock);
 712         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 713                               get_order(1));
 714         spin_unlock(&iscsit_global->ts_bitmap_lock);
 715         return ret;
 716 }
 717
 718 void iscsi_post_login_handler(
 719         struct iscsi_np *np,
 720         struct iscsi_conn *conn,
 721         u8 zero_tsih)
 722 {
 723         int stop_timer = 0;
 724         struct iscsi_session *sess = conn->sess;
 725         struct se_session *se_sess = sess->se_sess;
 726         struct iscsi_portal_group *tpg = sess->tpg;
 727         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 728
 729         iscsit_inc_conn_usage_count(conn);
 730
 731         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 732                         ISCSI_LOGIN_STATUS_ACCEPT);
 733
 734         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 735         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 736
 737         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 738         /*
 739          * SCSI Initiator -> SCSI Target Port Mapping
 740          */
 741         if (!zero_tsih) {
 742                 iscsi_set_session_parameters(sess->sess_ops,
 743                                 conn->param_list, 0);
 744                 iscsi_release_param_list(conn->param_list);
 745                 conn->param_list = NULL;
 746
 747                 spin_lock_bh(&sess->conn_lock);
 748                 atomic_set(&sess->session_continuation, 0);
 749                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 750                         pr_debug("Moving to"
 751                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 752                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 753                         stop_timer = 1;
 754                 }
 755
 756                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 757                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 758                         &conn->local_sockaddr, tpg->tpgt);
 759
 760                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 761                 atomic_inc(&sess->nconn);
 762                 pr_debug("Incremented iSCSI Connection count to %hu"
 763                         " from node: %s\n", atomic_read(&sess->nconn),
 764                         sess->sess_ops->InitiatorName);
 765                 spin_unlock_bh(&sess->conn_lock);
 766
 767                 iscsi_post_login_start_timers(conn);
 768                 /*
 769                  * Determine CPU mask to ensure connection's RX and TX kthreads
 770                  * are scheduled on the same CPU.
 771                  */
 772                 iscsit_thread_get_cpumask(conn);
 773                 conn->conn_rx_reset_cpumask = 1;
 774                 conn->conn_tx_reset_cpumask = 1;
 775                 /*
 776                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 777                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 778                  */
 779                 complete(&conn->rx_login_comp);
 780                 iscsit_dec_conn_usage_count(conn);
 781
 782                 if (stop_timer) {
 783                         spin_lock_bh(&se_tpg->session_lock);
 784                         iscsit_stop_time2retain_timer(sess);
 785                         spin_unlock_bh(&se_tpg->session_lock);
 786                 }
 787                 iscsit_dec_session_usage_count(sess);
 788                 return;
 789         }
 790
 791         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 792         iscsi_release_param_list(conn->param_list);
 793         conn->param_list = NULL;
 794
 795         iscsit_determine_maxcmdsn(sess);
 796
 797         spin_lock_bh(&se_tpg->session_lock);
 798         __transport_register_session(&sess->tpg->tpg_se_tpg,
 799                         se_sess->se_node_acl, se_sess, sess);
 800         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 801         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 802
 803         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 804                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 805                 tpg->tpgt);
 806
 807         spin_lock_bh(&sess->conn_lock);
 808         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 809         atomic_inc(&sess->nconn);
 810         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 811                 " %s\n", atomic_read(&sess->nconn),
 812                 sess->sess_ops->InitiatorName);
 813         spin_unlock_bh(&sess->conn_lock);
 814
 815         sess->sid = tpg->sid++;
 816         if (!sess->sid)
 817                 sess->sid = tpg->sid++;
 818         pr_debug("Established iSCSI session from node: %s\n",
 819                         sess->sess_ops->InitiatorName);
 820
 821         tpg->nsessions++;
 822         if (tpg->tpg_tiqn)
 823                 tpg->tpg_tiqn->tiqn_nsessions++;
 824
 825         pr_debug("Incremented number of active iSCSI sessions to %u on"
 826                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 827         spin_unlock_bh(&se_tpg->session_lock);
 828
 829         iscsi_post_login_start_timers(conn);
 830         /*
 831          * Determine CPU mask to ensure connection's RX and TX kthreads
 832          * are scheduled on the same CPU.
 833          */
 834         iscsit_thread_get_cpumask(conn);
 835         conn->conn_rx_reset_cpumask = 1;
 836         conn->conn_tx_reset_cpumask = 1;
 837         /*
 838          * Wakeup the sleeping iscsi_target_rx_thread() now that
 839          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 840          */
 841         complete(&conn->rx_login_comp);
 842         iscsit_dec_conn_usage_count(conn);
 843 }
 844
 845 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 846 {
 847         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 848
 849         spin_lock_bh(&np->np_thread_lock);
 850         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 851                         &np->np_sockaddr);
 852
 853         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 854                 spin_unlock_bh(&np->np_thread_lock);
 855                 return;
 856         }
 857
 858         if (np->np_thread)
 859                 send_sig(SIGINT, np->np_thread, 1);
 860
 861         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 862         spin_unlock_bh(&np->np_thread_lock);
 863 }
 864
 865 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 866 {
 867         /*
 868          * This used the TA_LOGIN_TIMEOUT constant because at this
 869          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 870          */
 871         spin_lock_bh(&np->np_thread_lock);
 872         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 873         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 874         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 875
 876         pr_debug("Added timeout timer to iSCSI login request for"
 877                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 878         spin_unlock_bh(&np->np_thread_lock);
 879 }
 880
 881 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 882 {
 883         spin_lock_bh(&np->np_thread_lock);
 884         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 885                 spin_unlock_bh(&np->np_thread_lock);
 886                 return;
 887         }
 888         np->np_login_timer_flags |= ISCSI_TF_STOP;
 889         spin_unlock_bh(&np->np_thread_lock);
 890
 891         del_timer_sync(&np->np_login_timer);
 892
 893         spin_lock_bh(&np->np_thread_lock);
 894         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 895         spin_unlock_bh(&np->np_thread_lock);
 896 }
 897
 898 int iscsit_setup_np(
 899         struct iscsi_np *np,
 900         struct sockaddr_storage *sockaddr)
 901 {
 902         struct socket *sock = NULL;
 903         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 904
 905         switch (np->np_network_transport) {
 906         case ISCSI_TCP:
 907                 np->np_ip_proto = IPPROTO_TCP;
 908                 np->np_sock_type = SOCK_STREAM;
 909                 break;
 910         case ISCSI_SCTP_TCP:
 911                 np->np_ip_proto = IPPROTO_SCTP;
 912                 np->np_sock_type = SOCK_STREAM;
 913                 break;
 914         case ISCSI_SCTP_UDP:
 915                 np->np_ip_proto = IPPROTO_SCTP;
 916                 np->np_sock_type = SOCK_SEQPACKET;
 917                 break;
 918         default:
 919                 pr_err("Unsupported network_transport: %d\n",
 920                                 np->np_network_transport);
 921                 return -EINVAL;
 922         }
 923
 924         np->np_ip_proto = IPPROTO_TCP;
 925         np->np_sock_type = SOCK_STREAM;
 926
 927         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 928                         np->np_ip_proto, &sock);
 929         if (ret < 0) {
 930                 pr_err("sock_create() failed.\n");
 931                 return ret;
 932         }
 933         np->np_socket = sock;
 934         /*
 935          * Setup the np->np_sockaddr from the passed sockaddr setup
 936          * in iscsi_target_configfs.c code..
 937          */
 938         memcpy(&np->np_sockaddr, sockaddr,
 939                         sizeof(struct sockaddr_storage));
 940
 941         if (sockaddr->ss_family == AF_INET6)
 942                 len = sizeof(struct sockaddr_in6);
 943         else
 944                 len = sizeof(struct sockaddr_in);
 945         /*
 946          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 947          */
 948         /* FIXME: Someone please explain why this is endian-safe */
 949         opt = 1;
 950         if (np->np_network_transport == ISCSI_TCP) {
 951                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 952                                 (char *)&opt, sizeof(opt));
 953                 if (ret < 0) {
 954                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 955                                 " failed: %d\n", ret);
 956                         goto fail;
 957                 }
 958         }
 959
 960         /* FIXME: Someone please explain why this is endian-safe */
 961         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 962                         (char *)&opt, sizeof(opt));
 963         if (ret < 0) {
 964                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 965                         " failed\n");
 966                 goto fail;
 967         }
 968
 969         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 970                         (char *)&opt, sizeof(opt));
 971         if (ret < 0) {
 972                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 973                         " failed\n");
 974                 goto fail;
 975         }
 976
 977         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 978         if (ret < 0) {
 979                 pr_err("kernel_bind() failed: %d\n", ret);
 980                 goto fail;
 981         }
 982
 983         ret = kernel_listen(sock, backlog);
 984         if (ret != 0) {
 985                 pr_err("kernel_listen() failed: %d\n", ret);
 986                 goto fail;
 987         }
 988
 989         return 0;
 990 fail:
 991         np->np_socket = NULL;
 992         sock_release(sock);
 993         return ret;
 994 }
 995
 996 int iscsi_target_setup_login_socket(
 997         struct iscsi_np *np,
 998         struct sockaddr_storage *sockaddr)
 999 {
1000         struct iscsit_transport *t;
1001         int rc;
1002
1003         t = iscsit_get_transport(np->np_network_transport);
1004         if (!t)
1005                 return -EINVAL;
1006
1007         rc = t->iscsit_setup_np(np, sockaddr);
1008         if (rc < 0) {
1009                 iscsit_put_transport(t);
1010                 return rc;
1011         }
1012
1013         np->np_transport = t;
1014         np->enabled = true;
1015         return 0;
1016 }
1017
1018 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1019 {
1020         struct socket *new_sock, *sock = np->np_socket;
1021         struct sockaddr_in sock_in;
1022         struct sockaddr_in6 sock_in6;
1023         int rc;
1024
1025         rc = kernel_accept(sock, &new_sock, 0);
1026         if (rc < 0)
1027                 return rc;
1028
1029         conn->sock = new_sock;
1030         conn->login_family = np->np_sockaddr.ss_family;
1031
1032         if (np->np_sockaddr.ss_family == AF_INET6) {
1033                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1034
1035                 rc = conn->sock->ops->getname(conn->sock,
1036                                 (struct sockaddr *)&sock_in6, 1);
1037                 if (rc >= 0) {
1038                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1039                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1040                         } else {
1041                                 /* Pretend to be an ipv4 socket */
1042                                 sock_in.sin_family = AF_INET;
1043                                 sock_in.sin_port = sock_in6.sin6_port;
1044                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1045                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1046                         }
1047                 }
1048
1049                 rc = conn->sock->ops->getname(conn->sock,
1050                                 (struct sockaddr *)&sock_in6, 0);
1051                 if (rc >= 0) {
1052                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1053                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1054                         } else {
1055                                 /* Pretend to be an ipv4 socket */
1056                                 sock_in.sin_family = AF_INET;
1057                                 sock_in.sin_port = sock_in6.sin6_port;
1058                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1059                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1060                         }
1061                 }
1062         } else {
1063                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1064
1065                 rc = conn->sock->ops->getname(conn->sock,
1066                                 (struct sockaddr *)&sock_in, 1);
1067                 if (rc >= 0)
1068                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1069
1070                 rc = conn->sock->ops->getname(conn->sock,
1071                                 (struct sockaddr *)&sock_in, 0);
1072                 if (rc >= 0)
1073                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1074         }
1075
1076         return 0;
1077 }
1078
1079 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1080 {
1081         struct iscsi_login_req *login_req;
1082         u32 padding = 0, payload_length;
1083
1084         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1085                 return -1;
1086
1087         login_req = (struct iscsi_login_req *)login->req;
1088         payload_length  = ntoh24(login_req->dlength);
1089         padding = ((-payload_length) & 3);
1090
1091         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1092                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1093                 login_req->flags, login_req->itt, login_req->cmdsn,
1094                 login_req->exp_statsn, login_req->cid, payload_length);
1095         /*
1096          * Setup the initial iscsi_login values from the leading
1097          * login request PDU.
1098          */
1099         if (login->first_request) {
1100                 login_req = (struct iscsi_login_req *)login->req;
1101                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1102                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1103                 login->version_min      = login_req->min_version;
1104                 login->version_max      = login_req->max_version;
1105                 memcpy(login->isid, login_req->isid, 6);
1106                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1107                 login->init_task_tag    = login_req->itt;
1108                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1109                 login->cid              = be16_to_cpu(login_req->cid);
1110                 login->tsih             = be16_to_cpu(login_req->tsih);
1111         }
1112
1113         if (iscsi_target_check_login_request(conn, login) < 0)
1114                 return -1;
1115
1116         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1117         if (iscsi_login_rx_data(conn, login->req_buf,
1118                                 payload_length + padding) < 0)
1119                 return -1;
1120
1121         return 0;
1122 }
1123
1124 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1125                         u32 length)
1126 {
1127         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1128                 return -1;
1129
1130         return 0;
1131 }
1132
1133 static int
1134 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1135 {
1136         int rc;
1137
1138         if (!t->owner) {
1139                 conn->conn_transport = t;
1140                 return 0;
1141         }
1142
1143         rc = try_module_get(t->owner);
1144         if (!rc) {
1145                 pr_err("try_module_get() failed for %s\n", t->name);
1146                 return -EINVAL;
1147         }
1148
1149         conn->conn_transport = t;
1150         return 0;
1151 }
1152
1153 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1154                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1155 {
1156         if (!new_sess)
1157                 goto old_sess_out;
1158
1159         pr_err("iSCSI Login negotiation failed.\n");
1160         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1161                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1162         if (!zero_tsih || !conn->sess)
1163                 goto old_sess_out;
1164         if (conn->sess->se_sess)
1165                 transport_free_session(conn->sess->se_sess);
1166         if (conn->sess->session_index != 0) {
1167                 spin_lock_bh(&sess_idr_lock);
1168                 idr_remove(&sess_idr, conn->sess->session_index);
1169                 spin_unlock_bh(&sess_idr_lock);
1170         }
1171         kfree(conn->sess->sess_ops);
1172         kfree(conn->sess);
1173         conn->sess = NULL;
1174
1175 old_sess_out:
1176         iscsi_stop_login_thread_timer(np);
1177         /*
1178          * If login negotiation fails check if the Time2Retain timer
1179          * needs to be restarted.
1180          */
1181         if (!zero_tsih && conn->sess) {
1182                 spin_lock_bh(&conn->sess->conn_lock);
1183                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1184                         struct se_portal_group *se_tpg =
1185                                         &conn->tpg->tpg_se_tpg;
1186
1187                         atomic_set(&conn->sess->session_continuation, 0);
1188                         spin_unlock_bh(&conn->sess->conn_lock);
1189                         spin_lock_bh(&se_tpg->session_lock);
1190                         iscsit_start_time2retain_handler(conn->sess);
1191                         spin_unlock_bh(&se_tpg->session_lock);
1192                 } else
1193                         spin_unlock_bh(&conn->sess->conn_lock);
1194                 iscsit_dec_session_usage_count(conn->sess);
1195         }
1196
1197         ahash_request_free(conn->conn_tx_hash);
1198         if (conn->conn_rx_hash) {
1199                 struct crypto_ahash *tfm;
1200
1201                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1202                 ahash_request_free(conn->conn_rx_hash);
1203                 crypto_free_ahash(tfm);
1204         }
1205
1206         free_cpumask_var(conn->conn_cpumask);
1207
1208         kfree(conn->conn_ops);
1209
1210         if (conn->param_list) {
1211                 iscsi_release_param_list(conn->param_list);
1212                 conn->param_list = NULL;
1213         }
1214         iscsi_target_nego_release(conn);
1215
1216         if (conn->sock) {
1217                 sock_release(conn->sock);
1218                 conn->sock = NULL;
1219         }
1220
1221         if (conn->conn_transport->iscsit_wait_conn)
1222                 conn->conn_transport->iscsit_wait_conn(conn);
1223
1224         if (conn->conn_transport->iscsit_free_conn)
1225                 conn->conn_transport->iscsit_free_conn(conn);
1226
1227         iscsit_put_transport(conn->conn_transport);
1228         kfree(conn);
1229 }
1230
1231 static int __iscsi_target_login_thread(struct iscsi_np *np)
1232 {
1233         u8 *buffer, zero_tsih = 0;
1234         int ret = 0, rc;
1235         struct iscsi_conn *conn = NULL;
1236         struct iscsi_login *login;
1237         struct iscsi_portal_group *tpg = NULL;
1238         struct iscsi_login_req *pdu;
1239         struct iscsi_tpg_np *tpg_np;
1240         bool new_sess = false;
1241
1242         flush_signals(current);
1243
1244         spin_lock_bh(&np->np_thread_lock);
1245         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1246                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1247                 spin_unlock_bh(&np->np_thread_lock);
1248                 complete(&np->np_restart_comp);
1249                 return 1;
1250         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1251                 spin_unlock_bh(&np->np_thread_lock);
1252                 goto exit;
1253         } else {
1254                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1255         }
1256         spin_unlock_bh(&np->np_thread_lock);
1257
1258         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1259         if (!conn) {
1260                 pr_err("Could not allocate memory for"
1261                         " new connection\n");
1262                 /* Get another socket */
1263                 return 1;
1264         }
1265         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1266         conn->conn_state = TARG_CONN_STATE_FREE;
1267
1268         timer_setup(&conn->nopin_response_timer,
1269                     iscsit_handle_nopin_response_timeout, 0);
1270         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1271
1272         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1273                 kfree(conn);
1274                 return 1;
1275         }
1276
1277         rc = np->np_transport->iscsit_accept_np(np, conn);
1278         if (rc == -ENOSYS) {
1279                 complete(&np->np_restart_comp);
1280                 iscsit_put_transport(conn->conn_transport);
1281                 kfree(conn);
1282                 conn = NULL;
1283                 goto exit;
1284         } else if (rc < 0) {
1285                 spin_lock_bh(&np->np_thread_lock);
1286                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1287                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1288                         spin_unlock_bh(&np->np_thread_lock);
1289                         complete(&np->np_restart_comp);
1290                         iscsit_put_transport(conn->conn_transport);
1291                         kfree(conn);
1292                         conn = NULL;
1293                         /* Get another socket */
1294                         return 1;
1295                 }
1296                 spin_unlock_bh(&np->np_thread_lock);
1297                 iscsit_put_transport(conn->conn_transport);
1298                 kfree(conn);
1299                 conn = NULL;
1300                 goto out;
1301         }
1302         /*
1303          * Perform the remaining iSCSI connection initialization items..
1304          */
1305         login = iscsi_login_init_conn(conn);
1306         if (!login) {
1307                 goto new_sess_out;
1308         }
1309
1310         iscsi_start_login_thread_timer(np);
1311
1312         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1313         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1314         /*
1315          * This will process the first login request + payload..
1316          */
1317         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1318         if (rc == 1)
1319                 return 1;
1320         else if (rc < 0)
1321                 goto new_sess_out;
1322
1323         buffer = &login->req[0];
1324         pdu = (struct iscsi_login_req *)buffer;
1325         /*
1326          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1327          * when Status-Class != 0.
1328         */
1329         conn->login_itt = pdu->itt;
1330
1331         spin_lock_bh(&np->np_thread_lock);
1332         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1333                 spin_unlock_bh(&np->np_thread_lock);
1334                 pr_err("iSCSI Network Portal on %pISpc currently not"
1335                         " active.\n", &np->np_sockaddr);
1336                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1337                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1338                 goto new_sess_out;
1339         }
1340         spin_unlock_bh(&np->np_thread_lock);
1341
1342         conn->network_transport = np->np_network_transport;
1343
1344         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1345                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1346                 &conn->local_sockaddr);
1347
1348         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1349         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1350
1351         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1352                         pdu->min_version) < 0)
1353                 goto new_sess_out;
1354
1355         zero_tsih = (pdu->tsih == 0x0000);
1356         if (zero_tsih) {
1357                 /*
1358                  * This is the leading connection of a new session.
1359                  * We wait until after authentication to check for
1360                  * session reinstatement.
1361                  */
1362                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1363                         goto new_sess_out;
1364         } else {
1365                 /*
1366                  * Add a new connection to an existing session.
1367                  * We check for a non-existant session in
1368                  * iscsi_login_non_zero_tsih_s2() below based
1369                  * on ISID/TSIH, but wait until after authentication
1370                  * to check for connection reinstatement, etc.
1371                  */
1372                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1373                         goto new_sess_out;
1374         }
1375         /*
1376          * SessionType: Discovery
1377          *
1378          *      Locates Default Portal
1379          *
1380          * SessionType: Normal
1381          *
1382          *      Locates Target Portal from NP -> Target IQN
1383          */
1384         rc = iscsi_target_locate_portal(np, conn, login);
1385         if (rc < 0) {
1386                 tpg = conn->tpg;
1387                 goto new_sess_out;
1388         }
1389         login->zero_tsih = zero_tsih;
1390
1391         if (conn->sess)
1392                 conn->sess->se_sess->sup_prot_ops =
1393                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1394
1395         tpg = conn->tpg;
1396         if (!tpg) {
1397                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1398                 goto new_sess_out;
1399         }
1400
1401         if (zero_tsih) {
1402                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1403                         goto new_sess_out;
1404         } else {
1405                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1406                         goto old_sess_out;
1407         }
1408
1409         if (conn->conn_transport->iscsit_validate_params) {
1410                 ret = conn->conn_transport->iscsit_validate_params(conn);
1411                 if (ret < 0) {
1412                         if (zero_tsih)
1413                                 goto new_sess_out;
1414                         else
1415                                 goto old_sess_out;
1416                 }
1417         }
1418
1419         ret = iscsi_target_start_negotiation(login, conn);
1420         if (ret < 0)
1421                 goto new_sess_out;
1422
1423         iscsi_stop_login_thread_timer(np);
1424
1425         if (ret == 1) {
1426                 tpg_np = conn->tpg_np;
1427
1428                 iscsi_post_login_handler(np, conn, zero_tsih);
1429                 iscsit_deaccess_np(np, tpg, tpg_np);
1430         }
1431
1432         tpg = NULL;
1433         tpg_np = NULL;
1434         /* Get another socket */
1435         return 1;
1436
1437 new_sess_out:
1438         new_sess = true;
1439 old_sess_out:
1440         tpg_np = conn->tpg_np;
1441         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1442         new_sess = false;
1443
1444         if (tpg) {
1445                 iscsit_deaccess_np(np, tpg, tpg_np);
1446                 tpg = NULL;
1447                 tpg_np = NULL;
1448         }
1449
1450 out:
1451         return 1;
1452
1453 exit:
1454         iscsi_stop_login_thread_timer(np);
1455         spin_lock_bh(&np->np_thread_lock);
1456         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1457         spin_unlock_bh(&np->np_thread_lock);
1458
1459         return 0;
1460 }
1461
1462 int iscsi_target_login_thread(void *arg)
1463 {
1464         struct iscsi_np *np = arg;
1465         int ret;
1466
1467         allow_signal(SIGINT);
1468
1469         while (1) {
1470                 ret = __iscsi_target_login_thread(np);
1471                 /*
1472                  * We break and exit here unless another sock_accept() call
1473                  * is expected.
1474                  */
1475                 if (ret != 1)
1476                         break;
1477         }
1478
1479         while (!kthread_should_stop()) {
1480                 msleep(100);
1481         }
1482
1483         return 0;
1484 }