drivers/target/iscsi/iscsi_target_login.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains the login functions used by the iSCSI Target driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14 #include <linux/kthread.h>
  15 #include <linux/sched/signal.h>
  16 #include <linux/idr.h>
  17 #include <linux/tcp.h>        /* TCP_NODELAY */
  18 #include <net/ipv6.h>         /* ipv6_addr_v4mapped() */
  19 #include <scsi/iscsi_proto.h>
  20 #include <target/target_core_base.h>
  21 #include <target/target_core_fabric.h>
  22
  23 #include <target/iscsi/iscsi_target_core.h>
  24 #include <target/iscsi/iscsi_target_stat.h>
  25 #include "iscsi_target_device.h"
  26 #include "iscsi_target_nego.h"
  27 #include "iscsi_target_erl0.h"
  28 #include "iscsi_target_erl2.h"
  29 #include "iscsi_target_login.h"
  30 #include "iscsi_target_tpg.h"
  31 #include "iscsi_target_util.h"
  32 #include "iscsi_target.h"
  33 #include "iscsi_target_parameters.h"
  34
  35 #include <target/iscsi/iscsi_transport.h>
  36
  37 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  38 {
  39         struct iscsi_login *login;
  40
  41         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  42         if (!login) {
  43                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  44                 return NULL;
  45         }
  46         conn->login = login;
  47         login->conn = conn;
  48         login->first_request = 1;
  49
  50         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  51         if (!login->req_buf) {
  52                 pr_err("Unable to allocate memory for response buffer.\n");
  53                 goto out_login;
  54         }
  55
  56         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  57         if (!login->rsp_buf) {
  58                 pr_err("Unable to allocate memory for request buffer.\n");
  59                 goto out_req_buf;
  60         }
  61
  62         conn->conn_login = login;
  63
  64         return login;
  65
  66 out_req_buf:
  67         kfree(login->req_buf);
  68 out_login:
  69         kfree(login);
  70         return NULL;
  71 }
  72
  73 /*
  74  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  75  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  76  */
  77 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  78 {
  79         struct crypto_ahash *tfm;
  80
  81         /*
  82          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  83          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  84          * to software 1x8 byte slicing from crc32c.ko
  85          */
  86         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
  87         if (IS_ERR(tfm)) {
  88                 pr_err("crypto_alloc_ahash() failed\n");
  89                 return -ENOMEM;
  90         }
  91
  92         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
  93         if (!conn->conn_rx_hash) {
  94                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
  95                 crypto_free_ahash(tfm);
  96                 return -ENOMEM;
  97         }
  98         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
  99
 100         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 101         if (!conn->conn_tx_hash) {
 102                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 103                 ahash_request_free(conn->conn_rx_hash);
 104                 conn->conn_rx_hash = NULL;
 105                 crypto_free_ahash(tfm);
 106                 return -ENOMEM;
 107         }
 108         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 109
 110         return 0;
 111 }
 112
 113 static int iscsi_login_check_initiator_version(
 114         struct iscsi_conn *conn,
 115         u8 version_max,
 116         u8 version_min)
 117 {
 118         if ((version_max != 0x00) || (version_min != 0x00)) {
 119                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 120                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 121                         version_min, version_max);
 122                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 123                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 124                 return -1;
 125         }
 126
 127         return 0;
 128 }
 129
 130 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 131 {
 132         int sessiontype;
 133         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 134         struct iscsi_portal_group *tpg = conn->tpg;
 135         struct iscsi_session *sess = NULL, *sess_p = NULL;
 136         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 137         struct se_session *se_sess, *se_sess_tmp;
 138
 139         initiatorname_param = iscsi_find_param_from_key(
 140                         INITIATORNAME, conn->param_list);
 141         sessiontype_param = iscsi_find_param_from_key(
 142                         SESSIONTYPE, conn->param_list);
 143         if (!initiatorname_param || !sessiontype_param) {
 144                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 145                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 146                 return -1;
 147         }
 148
 149         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 150
 151         spin_lock_bh(&se_tpg->session_lock);
 152         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 153                         sess_list) {
 154
 155                 sess_p = se_sess->fabric_sess_ptr;
 156                 spin_lock(&sess_p->conn_lock);
 157                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 158                     atomic_read(&sess_p->session_logout) ||
 159                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 160                         spin_unlock(&sess_p->conn_lock);
 161                         continue;
 162                 }
 163                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 164                    (!strcmp(sess_p->sess_ops->InitiatorName,
 165                             initiatorname_param->value) &&
 166                    (sess_p->sess_ops->SessionType == sessiontype))) {
 167                         atomic_set(&sess_p->session_reinstatement, 1);
 168                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 169                         spin_unlock(&sess_p->conn_lock);
 170                         iscsit_inc_session_usage_count(sess_p);
 171                         iscsit_stop_time2retain_timer(sess_p);
 172                         sess = sess_p;
 173                         break;
 174                 }
 175                 spin_unlock(&sess_p->conn_lock);
 176         }
 177         spin_unlock_bh(&se_tpg->session_lock);
 178         /*
 179          * If the Time2Retain handler has expired, the session is already gone.
 180          */
 181         if (!sess)
 182                 return 0;
 183
 184         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 185                 " performing session reinstatement.\n", (sessiontype) ?
 186                 "Discovery" : "Normal", sess->sid,
 187                 sess->sess_ops->InitiatorName);
 188
 189         spin_lock_bh(&sess->conn_lock);
 190         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 191                 spin_unlock_bh(&sess->conn_lock);
 192                 iscsit_dec_session_usage_count(sess);
 193                 iscsit_close_session(sess);
 194                 return 0;
 195         }
 196         spin_unlock_bh(&sess->conn_lock);
 197
 198         iscsit_stop_session(sess, 1, 1);
 199         iscsit_dec_session_usage_count(sess);
 200
 201         iscsit_close_session(sess);
 202         return 0;
 203 }
 204
 205 static int iscsi_login_set_conn_values(
 206         struct iscsi_session *sess,
 207         struct iscsi_conn *conn,
 208         __be16 cid)
 209 {
 210         int ret;
 211         conn->sess              = sess;
 212         conn->cid               = be16_to_cpu(cid);
 213         /*
 214          * Generate a random Status sequence number (statsn) for the new
 215          * iSCSI connection.
 216          */
 217         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 218         if (unlikely(ret))
 219                 return ret;
 220
 221         mutex_lock(&auth_id_lock);
 222         conn->auth_id           = iscsit_global->auth_id++;
 223         mutex_unlock(&auth_id_lock);
 224         return 0;
 225 }
 226
 227 __printf(2, 3) int iscsi_change_param_sprintf(
 228         struct iscsi_conn *conn,
 229         const char *fmt, ...)
 230 {
 231         va_list args;
 232         unsigned char buf[64];
 233
 234         memset(buf, 0, sizeof buf);
 235
 236         va_start(args, fmt);
 237         vsnprintf(buf, sizeof buf, fmt, args);
 238         va_end(args);
 239
 240         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 241                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 242                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 243                 return -1;
 244         }
 245
 246         return 0;
 247 }
 248 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 249
 250 /*
 251  *      This is the leading connection of a new session,
 252  *      or session reinstatement.
 253  */
 254 static int iscsi_login_zero_tsih_s1(
 255         struct iscsi_conn *conn,
 256         unsigned char *buf)
 257 {
 258         struct iscsi_session *sess = NULL;
 259         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 260         int ret;
 261
 262         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 263         if (!sess) {
 264                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 265                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 266                 pr_err("Could not allocate memory for session\n");
 267                 return -ENOMEM;
 268         }
 269
 270         if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
 271                 goto free_sess;
 272
 273         sess->init_task_tag     = pdu->itt;
 274         memcpy(&sess->isid, pdu->isid, 6);
 275         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 276         INIT_LIST_HEAD(&sess->sess_conn_list);
 277         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 278         INIT_LIST_HEAD(&sess->cr_active_list);
 279         INIT_LIST_HEAD(&sess->cr_inactive_list);
 280         init_completion(&sess->async_msg_comp);
 281         init_completion(&sess->reinstatement_comp);
 282         init_completion(&sess->session_wait_comp);
 283         init_completion(&sess->session_waiting_on_uc_comp);
 284         mutex_init(&sess->cmdsn_mutex);
 285         spin_lock_init(&sess->conn_lock);
 286         spin_lock_init(&sess->cr_a_lock);
 287         spin_lock_init(&sess->cr_i_lock);
 288         spin_lock_init(&sess->session_usage_lock);
 289         spin_lock_init(&sess->ttt_lock);
 290
 291         timer_setup(&sess->time2retain_timer,
 292                     iscsit_handle_time2retain_timeout, 0);
 293
 294         ret = ida_alloc(&sess_ida, GFP_KERNEL);
 295         if (ret < 0) {
 296                 pr_err("Session ID allocation failed %d\n", ret);
 297                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 298                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 299                 goto free_sess;
 300         }
 301
 302         sess->session_index = ret;
 303         sess->creation_time = get_jiffies_64();
 304         /*
 305          * The FFP CmdSN window values will be allocated from the TPG's
 306          * Initiator Node's ACL once the login has been successfully completed.
 307          */
 308         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 309
 310         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 311         if (!sess->sess_ops) {
 312                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 313                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 314                 pr_err("Unable to allocate memory for"
 315                                 " struct iscsi_sess_ops.\n");
 316                 goto free_id;
 317         }
 318
 319         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 320         if (IS_ERR(sess->se_sess)) {
 321                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 322                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 323                 goto free_ops;
 324         }
 325
 326         return 0;
 327
 328 free_ops:
 329         kfree(sess->sess_ops);
 330 free_id:
 331         ida_free(&sess_ida, sess->session_index);
 332 free_sess:
 333         kfree(sess);
 334         conn->sess = NULL;
 335         return -ENOMEM;
 336 }
 337
 338 static int iscsi_login_zero_tsih_s2(
 339         struct iscsi_conn *conn)
 340 {
 341         struct iscsi_node_attrib *na;
 342         struct iscsi_session *sess = conn->sess;
 343         bool iser = false;
 344
 345         sess->tpg = conn->tpg;
 346
 347         /*
 348          * Assign a new TPG Session Handle.  Note this is protected with
 349          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 350          */
 351         sess->tsih = ++sess->tpg->ntsih;
 352         if (!sess->tsih)
 353                 sess->tsih = ++sess->tpg->ntsih;
 354
 355         /*
 356          * Create the default params from user defined values..
 357          */
 358         if (iscsi_copy_param_list(&conn->param_list,
 359                                 conn->tpg->param_list, 1) < 0) {
 360                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 361                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 362                 return -1;
 363         }
 364
 365         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 366                 iser = true;
 367
 368         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 369
 370         if (sess->sess_ops->SessionType)
 371                 return iscsi_set_keys_irrelevant_for_discovery(
 372                                 conn->param_list);
 373
 374         na = iscsit_tpg_get_node_attrib(sess);
 375
 376         /*
 377          * Need to send TargetPortalGroupTag back in first login response
 378          * on any iSCSI connection where the Initiator provides TargetName.
 379          * See 5.3.1.  Login Phase Start
 380          *
 381          * In our case, we have already located the struct iscsi_tiqn at this point.
 382          */
 383         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 384                 return -1;
 385
 386         /*
 387          * Workaround for Initiators that have broken connection recovery logic.
 388          *
 389          * "We would really like to get rid of this." Linux-iSCSI.org team
 390          */
 391         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 392                 return -1;
 393
 394         /*
 395          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 396          */
 397         if (iser) {
 398                 struct iscsi_param *param;
 399                 unsigned long mrdsl, off;
 400                 int rc;
 401
 402                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 403                         return -1;
 404
 405                 /*
 406                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 407                  * Immediate Data + Unsolicited Data-OUT if necessary..
 408                  */
 409                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 410                                                   conn->param_list);
 411                 if (!param) {
 412                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 413                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 414                         return -1;
 415                 }
 416                 rc = kstrtoul(param->value, 0, &mrdsl);
 417                 if (rc < 0) {
 418                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 419                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 420                         return -1;
 421                 }
 422                 off = mrdsl % PAGE_SIZE;
 423                 if (!off)
 424                         goto check_prot;
 425
 426                 if (mrdsl < PAGE_SIZE)
 427                         mrdsl = PAGE_SIZE;
 428                 else
 429                         mrdsl -= off;
 430
 431                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 432                         " to PAGE_SIZE\n", mrdsl);
 433
 434                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 435                         return -1;
 436                 /*
 437                  * ISER currently requires that ImmediateData + Unsolicited
 438                  * Data be disabled when protection / signature MRs are enabled.
 439                  */
 440 check_prot:
 441                 if (sess->se_sess->sup_prot_ops &
 442                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 443                     TARGET_PROT_DOUT_INSERT)) {
 444
 445                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 446                                 return -1;
 447
 448                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 449                                 return -1;
 450
 451                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 452                                  " T10-PI enabled ISER session\n");
 453                 }
 454         }
 455
 456         return 0;
 457 }
 458
 459 static int iscsi_login_non_zero_tsih_s1(
 460         struct iscsi_conn *conn,
 461         unsigned char *buf)
 462 {
 463         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 464
 465         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 466 }
 467
 468 /*
 469  *      Add a new connection to an existing session.
 470  */
 471 static int iscsi_login_non_zero_tsih_s2(
 472         struct iscsi_conn *conn,
 473         unsigned char *buf)
 474 {
 475         struct iscsi_portal_group *tpg = conn->tpg;
 476         struct iscsi_session *sess = NULL, *sess_p = NULL;
 477         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 478         struct se_session *se_sess, *se_sess_tmp;
 479         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 480         bool iser = false;
 481
 482         spin_lock_bh(&se_tpg->session_lock);
 483         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 484                         sess_list) {
 485
 486                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 487                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 488                     atomic_read(&sess_p->session_logout) ||
 489                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 490                         continue;
 491                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 492                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 493                         iscsit_inc_session_usage_count(sess_p);
 494                         iscsit_stop_time2retain_timer(sess_p);
 495                         sess = sess_p;
 496                         break;
 497                 }
 498         }
 499         spin_unlock_bh(&se_tpg->session_lock);
 500
 501         /*
 502          * If the Time2Retain handler has expired, the session is already gone.
 503          */
 504         if (!sess) {
 505                 pr_err("Initiator attempting to add a connection to"
 506                         " a non-existent session, rejecting iSCSI Login.\n");
 507                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 508                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 509                 return -1;
 510         }
 511
 512         /*
 513          * Stop the Time2Retain timer if this is a failed session, we restart
 514          * the timer if the login is not successful.
 515          */
 516         spin_lock_bh(&sess->conn_lock);
 517         if (sess->session_state == TARG_SESS_STATE_FAILED)
 518                 atomic_set(&sess->session_continuation, 1);
 519         spin_unlock_bh(&sess->conn_lock);
 520
 521         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 522             iscsi_copy_param_list(&conn->param_list,
 523                         conn->tpg->param_list, 0) < 0) {
 524                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 525                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 526                 return -1;
 527         }
 528
 529         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 530                 iser = true;
 531
 532         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 533         /*
 534          * Need to send TargetPortalGroupTag back in first login response
 535          * on any iSCSI connection where the Initiator provides TargetName.
 536          * See 5.3.1.  Login Phase Start
 537          *
 538          * In our case, we have already located the struct iscsi_tiqn at this point.
 539          */
 540         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 541                 return -1;
 542
 543         return 0;
 544 }
 545
 546 int iscsi_login_post_auth_non_zero_tsih(
 547         struct iscsi_conn *conn,
 548         u16 cid,
 549         u32 exp_statsn)
 550 {
 551         struct iscsi_conn *conn_ptr = NULL;
 552         struct iscsi_conn_recovery *cr = NULL;
 553         struct iscsi_session *sess = conn->sess;
 554
 555         /*
 556          * By following item 5 in the login table,  if we have found
 557          * an existing ISID and a valid/existing TSIH and an existing
 558          * CID we do connection reinstatement.  Currently we dont not
 559          * support it so we send back an non-zero status class to the
 560          * initiator and release the new connection.
 561          */
 562         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 563         if (conn_ptr) {
 564                 pr_err("Connection exists with CID %hu for %s,"
 565                         " performing connection reinstatement.\n",
 566                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 567
 568                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 569                 iscsit_dec_conn_usage_count(conn_ptr);
 570         }
 571
 572         /*
 573          * Check for any connection recovery entries containing CID.
 574          * We use the original ExpStatSN sent in the first login request
 575          * to acknowledge commands for the failed connection.
 576          *
 577          * Also note that an explict logout may have already been sent,
 578          * but the response may not be sent due to additional connection
 579          * loss.
 580          */
 581         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 582                 cr = iscsit_get_inactive_connection_recovery_entry(
 583                                 sess, cid);
 584                 if (cr) {
 585                         pr_debug("Performing implicit logout"
 586                                 " for connection recovery on CID: %hu\n",
 587                                         conn->cid);
 588                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 589                 }
 590         }
 591
 592         /*
 593          * Else we follow item 4 from the login table in that we have
 594          * found an existing ISID and a valid/existing TSIH and a new
 595          * CID we go ahead and continue to add a new connection to the
 596          * session.
 597          */
 598         pr_debug("Adding CID %hu to existing session for %s.\n",
 599                         cid, sess->sess_ops->InitiatorName);
 600
 601         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 602                 pr_err("Adding additional connection to this session"
 603                         " would exceed MaxConnections %d, login failed.\n",
 604                                 sess->sess_ops->MaxConnections);
 605                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 606                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 607                 return -1;
 608         }
 609
 610         return 0;
 611 }
 612
 613 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 614 {
 615         struct iscsi_session *sess = conn->sess;
 616         /*
 617          * FIXME: Unsolicited NopIN support for ISER
 618          */
 619         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 620                 return;
 621
 622         if (!sess->sess_ops->SessionType)
 623                 iscsit_start_nopin_timer(conn);
 624 }
 625
 626 int iscsit_start_kthreads(struct iscsi_conn *conn)
 627 {
 628         int ret = 0;
 629
 630         spin_lock(&iscsit_global->ts_bitmap_lock);
 631         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 632                                         ISCSIT_BITMAP_BITS, get_order(1));
 633         spin_unlock(&iscsit_global->ts_bitmap_lock);
 634
 635         if (conn->bitmap_id < 0) {
 636                 pr_err("bitmap_find_free_region() failed for"
 637                        " iscsit_start_kthreads()\n");
 638                 return -ENOMEM;
 639         }
 640
 641         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 642                                       "%s", ISCSI_TX_THREAD_NAME);
 643         if (IS_ERR(conn->tx_thread)) {
 644                 pr_err("Unable to start iscsi_target_tx_thread\n");
 645                 ret = PTR_ERR(conn->tx_thread);
 646                 goto out_bitmap;
 647         }
 648         conn->tx_thread_active = true;
 649
 650         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 651                                       "%s", ISCSI_RX_THREAD_NAME);
 652         if (IS_ERR(conn->rx_thread)) {
 653                 pr_err("Unable to start iscsi_target_rx_thread\n");
 654                 ret = PTR_ERR(conn->rx_thread);
 655                 goto out_tx;
 656         }
 657         conn->rx_thread_active = true;
 658
 659         return 0;
 660 out_tx:
 661         send_sig(SIGINT, conn->tx_thread, 1);
 662         kthread_stop(conn->tx_thread);
 663         conn->tx_thread_active = false;
 664 out_bitmap:
 665         spin_lock(&iscsit_global->ts_bitmap_lock);
 666         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 667                               get_order(1));
 668         spin_unlock(&iscsit_global->ts_bitmap_lock);
 669         return ret;
 670 }
 671
 672 void iscsi_post_login_handler(
 673         struct iscsi_np *np,
 674         struct iscsi_conn *conn,
 675         u8 zero_tsih)
 676 {
 677         int stop_timer = 0;
 678         struct iscsi_session *sess = conn->sess;
 679         struct se_session *se_sess = sess->se_sess;
 680         struct iscsi_portal_group *tpg = sess->tpg;
 681         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 682
 683         iscsit_inc_conn_usage_count(conn);
 684
 685         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 686                         ISCSI_LOGIN_STATUS_ACCEPT);
 687
 688         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 689         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 690
 691         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 692         /*
 693          * SCSI Initiator -> SCSI Target Port Mapping
 694          */
 695         if (!zero_tsih) {
 696                 iscsi_set_session_parameters(sess->sess_ops,
 697                                 conn->param_list, 0);
 698                 iscsi_release_param_list(conn->param_list);
 699                 conn->param_list = NULL;
 700
 701                 spin_lock_bh(&sess->conn_lock);
 702                 atomic_set(&sess->session_continuation, 0);
 703                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 704                         pr_debug("Moving to"
 705                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 706                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 707                         stop_timer = 1;
 708                 }
 709
 710                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 711                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 712                         &conn->local_sockaddr, tpg->tpgt);
 713
 714                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 715                 atomic_inc(&sess->nconn);
 716                 pr_debug("Incremented iSCSI Connection count to %hu"
 717                         " from node: %s\n", atomic_read(&sess->nconn),
 718                         sess->sess_ops->InitiatorName);
 719                 spin_unlock_bh(&sess->conn_lock);
 720
 721                 iscsi_post_login_start_timers(conn);
 722                 /*
 723                  * Determine CPU mask to ensure connection's RX and TX kthreads
 724                  * are scheduled on the same CPU.
 725                  */
 726                 iscsit_thread_get_cpumask(conn);
 727                 conn->conn_rx_reset_cpumask = 1;
 728                 conn->conn_tx_reset_cpumask = 1;
 729                 /*
 730                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 731                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 732                  */
 733                 complete(&conn->rx_login_comp);
 734                 iscsit_dec_conn_usage_count(conn);
 735
 736                 if (stop_timer) {
 737                         spin_lock_bh(&se_tpg->session_lock);
 738                         iscsit_stop_time2retain_timer(sess);
 739                         spin_unlock_bh(&se_tpg->session_lock);
 740                 }
 741                 iscsit_dec_session_usage_count(sess);
 742                 return;
 743         }
 744
 745         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 746         iscsi_release_param_list(conn->param_list);
 747         conn->param_list = NULL;
 748
 749         iscsit_determine_maxcmdsn(sess);
 750
 751         spin_lock_bh(&se_tpg->session_lock);
 752         __transport_register_session(&sess->tpg->tpg_se_tpg,
 753                         se_sess->se_node_acl, se_sess, sess);
 754         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 755         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 756
 757         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 758                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 759                 tpg->tpgt);
 760
 761         spin_lock_bh(&sess->conn_lock);
 762         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 763         atomic_inc(&sess->nconn);
 764         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 765                 " %s\n", atomic_read(&sess->nconn),
 766                 sess->sess_ops->InitiatorName);
 767         spin_unlock_bh(&sess->conn_lock);
 768
 769         sess->sid = tpg->sid++;
 770         if (!sess->sid)
 771                 sess->sid = tpg->sid++;
 772         pr_debug("Established iSCSI session from node: %s\n",
 773                         sess->sess_ops->InitiatorName);
 774
 775         tpg->nsessions++;
 776         if (tpg->tpg_tiqn)
 777                 tpg->tpg_tiqn->tiqn_nsessions++;
 778
 779         pr_debug("Incremented number of active iSCSI sessions to %u on"
 780                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 781         spin_unlock_bh(&se_tpg->session_lock);
 782
 783         iscsi_post_login_start_timers(conn);
 784         /*
 785          * Determine CPU mask to ensure connection's RX and TX kthreads
 786          * are scheduled on the same CPU.
 787          */
 788         iscsit_thread_get_cpumask(conn);
 789         conn->conn_rx_reset_cpumask = 1;
 790         conn->conn_tx_reset_cpumask = 1;
 791         /*
 792          * Wakeup the sleeping iscsi_target_rx_thread() now that
 793          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 794          */
 795         complete(&conn->rx_login_comp);
 796         iscsit_dec_conn_usage_count(conn);
 797 }
 798
 799 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 800 {
 801         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 802
 803         spin_lock_bh(&np->np_thread_lock);
 804         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 805                         &np->np_sockaddr);
 806
 807         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 808                 spin_unlock_bh(&np->np_thread_lock);
 809                 return;
 810         }
 811
 812         if (np->np_thread)
 813                 send_sig(SIGINT, np->np_thread, 1);
 814
 815         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 816         spin_unlock_bh(&np->np_thread_lock);
 817 }
 818
 819 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 820 {
 821         /*
 822          * This used the TA_LOGIN_TIMEOUT constant because at this
 823          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 824          */
 825         spin_lock_bh(&np->np_thread_lock);
 826         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 827         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 828         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 829
 830         pr_debug("Added timeout timer to iSCSI login request for"
 831                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 832         spin_unlock_bh(&np->np_thread_lock);
 833 }
 834
 835 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 836 {
 837         spin_lock_bh(&np->np_thread_lock);
 838         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 839                 spin_unlock_bh(&np->np_thread_lock);
 840                 return;
 841         }
 842         np->np_login_timer_flags |= ISCSI_TF_STOP;
 843         spin_unlock_bh(&np->np_thread_lock);
 844
 845         del_timer_sync(&np->np_login_timer);
 846
 847         spin_lock_bh(&np->np_thread_lock);
 848         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 849         spin_unlock_bh(&np->np_thread_lock);
 850 }
 851
 852 int iscsit_setup_np(
 853         struct iscsi_np *np,
 854         struct sockaddr_storage *sockaddr)
 855 {
 856         struct socket *sock = NULL;
 857         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 858
 859         switch (np->np_network_transport) {
 860         case ISCSI_TCP:
 861                 np->np_ip_proto = IPPROTO_TCP;
 862                 np->np_sock_type = SOCK_STREAM;
 863                 break;
 864         case ISCSI_SCTP_TCP:
 865                 np->np_ip_proto = IPPROTO_SCTP;
 866                 np->np_sock_type = SOCK_STREAM;
 867                 break;
 868         case ISCSI_SCTP_UDP:
 869                 np->np_ip_proto = IPPROTO_SCTP;
 870                 np->np_sock_type = SOCK_SEQPACKET;
 871                 break;
 872         default:
 873                 pr_err("Unsupported network_transport: %d\n",
 874                                 np->np_network_transport);
 875                 return -EINVAL;
 876         }
 877
 878         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 879                         np->np_ip_proto, &sock);
 880         if (ret < 0) {
 881                 pr_err("sock_create() failed.\n");
 882                 return ret;
 883         }
 884         np->np_socket = sock;
 885         /*
 886          * Setup the np->np_sockaddr from the passed sockaddr setup
 887          * in iscsi_target_configfs.c code..
 888          */
 889         memcpy(&np->np_sockaddr, sockaddr,
 890                         sizeof(struct sockaddr_storage));
 891
 892         if (sockaddr->ss_family == AF_INET6)
 893                 len = sizeof(struct sockaddr_in6);
 894         else
 895                 len = sizeof(struct sockaddr_in);
 896         /*
 897          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 898          */
 899         /* FIXME: Someone please explain why this is endian-safe */
 900         opt = 1;
 901         if (np->np_network_transport == ISCSI_TCP) {
 902                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 903                                 (char *)&opt, sizeof(opt));
 904                 if (ret < 0) {
 905                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 906                                 " failed: %d\n", ret);
 907                         goto fail;
 908                 }
 909         }
 910
 911         /* FIXME: Someone please explain why this is endian-safe */
 912         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 913                         (char *)&opt, sizeof(opt));
 914         if (ret < 0) {
 915                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 916                         " failed\n");
 917                 goto fail;
 918         }
 919
 920         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 921                         (char *)&opt, sizeof(opt));
 922         if (ret < 0) {
 923                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 924                         " failed\n");
 925                 goto fail;
 926         }
 927
 928         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 929         if (ret < 0) {
 930                 pr_err("kernel_bind() failed: %d\n", ret);
 931                 goto fail;
 932         }
 933
 934         ret = kernel_listen(sock, backlog);
 935         if (ret != 0) {
 936                 pr_err("kernel_listen() failed: %d\n", ret);
 937                 goto fail;
 938         }
 939
 940         return 0;
 941 fail:
 942         np->np_socket = NULL;
 943         sock_release(sock);
 944         return ret;
 945 }
 946
 947 int iscsi_target_setup_login_socket(
 948         struct iscsi_np *np,
 949         struct sockaddr_storage *sockaddr)
 950 {
 951         struct iscsit_transport *t;
 952         int rc;
 953
 954         t = iscsit_get_transport(np->np_network_transport);
 955         if (!t)
 956                 return -EINVAL;
 957
 958         rc = t->iscsit_setup_np(np, sockaddr);
 959         if (rc < 0) {
 960                 iscsit_put_transport(t);
 961                 return rc;
 962         }
 963
 964         np->np_transport = t;
 965         np->enabled = true;
 966         return 0;
 967 }
 968
 969 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 970 {
 971         struct socket *new_sock, *sock = np->np_socket;
 972         struct sockaddr_in sock_in;
 973         struct sockaddr_in6 sock_in6;
 974         int rc;
 975
 976         rc = kernel_accept(sock, &new_sock, 0);
 977         if (rc < 0)
 978                 return rc;
 979
 980         conn->sock = new_sock;
 981         conn->login_family = np->np_sockaddr.ss_family;
 982
 983         if (np->np_sockaddr.ss_family == AF_INET6) {
 984                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 985
 986                 rc = conn->sock->ops->getname(conn->sock,
 987                                 (struct sockaddr *)&sock_in6, 1);
 988                 if (rc >= 0) {
 989                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 990                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
 991                         } else {
 992                                 /* Pretend to be an ipv4 socket */
 993                                 sock_in.sin_family = AF_INET;
 994                                 sock_in.sin_port = sock_in6.sin6_port;
 995                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
 996                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
 997                         }
 998                 }
 999
1000                 rc = conn->sock->ops->getname(conn->sock,
1001                                 (struct sockaddr *)&sock_in6, 0);
1002                 if (rc >= 0) {
1003                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1004                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1005                         } else {
1006                                 /* Pretend to be an ipv4 socket */
1007                                 sock_in.sin_family = AF_INET;
1008                                 sock_in.sin_port = sock_in6.sin6_port;
1009                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1010                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1011                         }
1012                 }
1013         } else {
1014                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1015
1016                 rc = conn->sock->ops->getname(conn->sock,
1017                                 (struct sockaddr *)&sock_in, 1);
1018                 if (rc >= 0)
1019                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1020
1021                 rc = conn->sock->ops->getname(conn->sock,
1022                                 (struct sockaddr *)&sock_in, 0);
1023                 if (rc >= 0)
1024                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1025         }
1026
1027         return 0;
1028 }
1029
1030 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1031 {
1032         struct iscsi_login_req *login_req;
1033         u32 padding = 0, payload_length;
1034
1035         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1036                 return -1;
1037
1038         login_req = (struct iscsi_login_req *)login->req;
1039         payload_length  = ntoh24(login_req->dlength);
1040         padding = ((-payload_length) & 3);
1041
1042         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1043                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1044                 login_req->flags, login_req->itt, login_req->cmdsn,
1045                 login_req->exp_statsn, login_req->cid, payload_length);
1046         /*
1047          * Setup the initial iscsi_login values from the leading
1048          * login request PDU.
1049          */
1050         if (login->first_request) {
1051                 login_req = (struct iscsi_login_req *)login->req;
1052                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1053                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1054                 login->version_min      = login_req->min_version;
1055                 login->version_max      = login_req->max_version;
1056                 memcpy(login->isid, login_req->isid, 6);
1057                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1058                 login->init_task_tag    = login_req->itt;
1059                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1060                 login->cid              = be16_to_cpu(login_req->cid);
1061                 login->tsih             = be16_to_cpu(login_req->tsih);
1062         }
1063
1064         if (iscsi_target_check_login_request(conn, login) < 0)
1065                 return -1;
1066
1067         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1068         if (iscsi_login_rx_data(conn, login->req_buf,
1069                                 payload_length + padding) < 0)
1070                 return -1;
1071
1072         return 0;
1073 }
1074
1075 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1076                         u32 length)
1077 {
1078         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1079                 return -1;
1080
1081         return 0;
1082 }
1083
1084 static int
1085 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1086 {
1087         int rc;
1088
1089         if (!t->owner) {
1090                 conn->conn_transport = t;
1091                 return 0;
1092         }
1093
1094         rc = try_module_get(t->owner);
1095         if (!rc) {
1096                 pr_err("try_module_get() failed for %s\n", t->name);
1097                 return -EINVAL;
1098         }
1099
1100         conn->conn_transport = t;
1101         return 0;
1102 }
1103
1104 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1105 {
1106         struct iscsi_conn *conn;
1107
1108         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1109         if (!conn) {
1110                 pr_err("Could not allocate memory for new connection\n");
1111                 return NULL;
1112         }
1113         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1114         conn->conn_state = TARG_CONN_STATE_FREE;
1115
1116         init_waitqueue_head(&conn->queues_wq);
1117         INIT_LIST_HEAD(&conn->conn_list);
1118         INIT_LIST_HEAD(&conn->conn_cmd_list);
1119         INIT_LIST_HEAD(&conn->immed_queue_list);
1120         INIT_LIST_HEAD(&conn->response_queue_list);
1121         init_completion(&conn->conn_post_wait_comp);
1122         init_completion(&conn->conn_wait_comp);
1123         init_completion(&conn->conn_wait_rcfr_comp);
1124         init_completion(&conn->conn_waiting_on_uc_comp);
1125         init_completion(&conn->conn_logout_comp);
1126         init_completion(&conn->rx_half_close_comp);
1127         init_completion(&conn->tx_half_close_comp);
1128         init_completion(&conn->rx_login_comp);
1129         spin_lock_init(&conn->cmd_lock);
1130         spin_lock_init(&conn->conn_usage_lock);
1131         spin_lock_init(&conn->immed_queue_lock);
1132         spin_lock_init(&conn->nopin_timer_lock);
1133         spin_lock_init(&conn->response_queue_lock);
1134         spin_lock_init(&conn->state_lock);
1135
1136         timer_setup(&conn->nopin_response_timer,
1137                     iscsit_handle_nopin_response_timeout, 0);
1138         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1139
1140         if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1141                 goto free_conn;
1142
1143         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1144         if (!conn->conn_ops) {
1145                 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1146                 goto put_transport;
1147         }
1148
1149         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1150                 pr_err("Unable to allocate conn->conn_cpumask\n");
1151                 goto free_conn_ops;
1152         }
1153
1154         return conn;
1155
1156 free_conn_ops:
1157         kfree(conn->conn_ops);
1158 put_transport:
1159         iscsit_put_transport(conn->conn_transport);
1160 free_conn:
1161         kfree(conn);
1162         return NULL;
1163 }
1164
1165 void iscsit_free_conn(struct iscsi_conn *conn)
1166 {
1167         free_cpumask_var(conn->conn_cpumask);
1168         kfree(conn->conn_ops);
1169         iscsit_put_transport(conn->conn_transport);
1170         kfree(conn);
1171 }
1172
1173 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1174                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1175 {
1176         if (!new_sess)
1177                 goto old_sess_out;
1178
1179         pr_err("iSCSI Login negotiation failed.\n");
1180         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1181                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1182         if (!zero_tsih || !conn->sess)
1183                 goto old_sess_out;
1184
1185         transport_free_session(conn->sess->se_sess);
1186         ida_free(&sess_ida, conn->sess->session_index);
1187         kfree(conn->sess->sess_ops);
1188         kfree(conn->sess);
1189         conn->sess = NULL;
1190
1191 old_sess_out:
1192         iscsi_stop_login_thread_timer(np);
1193         /*
1194          * If login negotiation fails check if the Time2Retain timer
1195          * needs to be restarted.
1196          */
1197         if (!zero_tsih && conn->sess) {
1198                 spin_lock_bh(&conn->sess->conn_lock);
1199                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1200                         struct se_portal_group *se_tpg =
1201                                         &conn->tpg->tpg_se_tpg;
1202
1203                         atomic_set(&conn->sess->session_continuation, 0);
1204                         spin_unlock_bh(&conn->sess->conn_lock);
1205                         spin_lock_bh(&se_tpg->session_lock);
1206                         iscsit_start_time2retain_handler(conn->sess);
1207                         spin_unlock_bh(&se_tpg->session_lock);
1208                 } else
1209                         spin_unlock_bh(&conn->sess->conn_lock);
1210                 iscsit_dec_session_usage_count(conn->sess);
1211         }
1212
1213         ahash_request_free(conn->conn_tx_hash);
1214         if (conn->conn_rx_hash) {
1215                 struct crypto_ahash *tfm;
1216
1217                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1218                 ahash_request_free(conn->conn_rx_hash);
1219                 crypto_free_ahash(tfm);
1220         }
1221
1222         if (conn->param_list) {
1223                 iscsi_release_param_list(conn->param_list);
1224                 conn->param_list = NULL;
1225         }
1226         iscsi_target_nego_release(conn);
1227
1228         if (conn->sock) {
1229                 sock_release(conn->sock);
1230                 conn->sock = NULL;
1231         }
1232
1233         if (conn->conn_transport->iscsit_wait_conn)
1234                 conn->conn_transport->iscsit_wait_conn(conn);
1235
1236         if (conn->conn_transport->iscsit_free_conn)
1237                 conn->conn_transport->iscsit_free_conn(conn);
1238
1239         iscsit_free_conn(conn);
1240 }
1241
1242 static int __iscsi_target_login_thread(struct iscsi_np *np)
1243 {
1244         u8 *buffer, zero_tsih = 0;
1245         int ret = 0, rc;
1246         struct iscsi_conn *conn = NULL;
1247         struct iscsi_login *login;
1248         struct iscsi_portal_group *tpg = NULL;
1249         struct iscsi_login_req *pdu;
1250         struct iscsi_tpg_np *tpg_np;
1251         bool new_sess = false;
1252
1253         flush_signals(current);
1254
1255         spin_lock_bh(&np->np_thread_lock);
1256         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1257                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1258                 spin_unlock_bh(&np->np_thread_lock);
1259                 complete(&np->np_restart_comp);
1260                 return 1;
1261         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1262                 spin_unlock_bh(&np->np_thread_lock);
1263                 goto exit;
1264         } else {
1265                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1266         }
1267         spin_unlock_bh(&np->np_thread_lock);
1268
1269         conn = iscsit_alloc_conn(np);
1270         if (!conn) {
1271                 /* Get another socket */
1272                 return 1;
1273         }
1274
1275         rc = np->np_transport->iscsit_accept_np(np, conn);
1276         if (rc == -ENOSYS) {
1277                 complete(&np->np_restart_comp);
1278                 iscsit_free_conn(conn);
1279                 goto exit;
1280         } else if (rc < 0) {
1281                 spin_lock_bh(&np->np_thread_lock);
1282                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1283                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1284                         spin_unlock_bh(&np->np_thread_lock);
1285                         complete(&np->np_restart_comp);
1286                         iscsit_free_conn(conn);
1287                         /* Get another socket */
1288                         return 1;
1289                 }
1290                 spin_unlock_bh(&np->np_thread_lock);
1291                 iscsit_free_conn(conn);
1292                 return 1;
1293         }
1294         /*
1295          * Perform the remaining iSCSI connection initialization items..
1296          */
1297         login = iscsi_login_init_conn(conn);
1298         if (!login) {
1299                 goto new_sess_out;
1300         }
1301
1302         iscsi_start_login_thread_timer(np);
1303
1304         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1305         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1306         /*
1307          * This will process the first login request + payload..
1308          */
1309         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1310         if (rc == 1)
1311                 return 1;
1312         else if (rc < 0)
1313                 goto new_sess_out;
1314
1315         buffer = &login->req[0];
1316         pdu = (struct iscsi_login_req *)buffer;
1317         /*
1318          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1319          * when Status-Class != 0.
1320         */
1321         conn->login_itt = pdu->itt;
1322
1323         spin_lock_bh(&np->np_thread_lock);
1324         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1325                 spin_unlock_bh(&np->np_thread_lock);
1326                 pr_err("iSCSI Network Portal on %pISpc currently not"
1327                         " active.\n", &np->np_sockaddr);
1328                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1329                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1330                 goto new_sess_out;
1331         }
1332         spin_unlock_bh(&np->np_thread_lock);
1333
1334         conn->network_transport = np->np_network_transport;
1335
1336         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1337                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1338                 &conn->local_sockaddr);
1339
1340         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1341         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1342
1343         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1344                         pdu->min_version) < 0)
1345                 goto new_sess_out;
1346
1347         zero_tsih = (pdu->tsih == 0x0000);
1348         if (zero_tsih) {
1349                 /*
1350                  * This is the leading connection of a new session.
1351                  * We wait until after authentication to check for
1352                  * session reinstatement.
1353                  */
1354                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1355                         goto new_sess_out;
1356         } else {
1357                 /*
1358                  * Add a new connection to an existing session.
1359                  * We check for a non-existant session in
1360                  * iscsi_login_non_zero_tsih_s2() below based
1361                  * on ISID/TSIH, but wait until after authentication
1362                  * to check for connection reinstatement, etc.
1363                  */
1364                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1365                         goto new_sess_out;
1366         }
1367         /*
1368          * SessionType: Discovery
1369          *
1370          *      Locates Default Portal
1371          *
1372          * SessionType: Normal
1373          *
1374          *      Locates Target Portal from NP -> Target IQN
1375          */
1376         rc = iscsi_target_locate_portal(np, conn, login);
1377         if (rc < 0) {
1378                 tpg = conn->tpg;
1379                 goto new_sess_out;
1380         }
1381         login->zero_tsih = zero_tsih;
1382
1383         if (conn->sess)
1384                 conn->sess->se_sess->sup_prot_ops =
1385                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1386
1387         tpg = conn->tpg;
1388         if (!tpg) {
1389                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1390                 goto new_sess_out;
1391         }
1392
1393         if (zero_tsih) {
1394                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1395                         goto new_sess_out;
1396         } else {
1397                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1398                         goto old_sess_out;
1399         }
1400
1401         if (conn->conn_transport->iscsit_validate_params) {
1402                 ret = conn->conn_transport->iscsit_validate_params(conn);
1403                 if (ret < 0) {
1404                         if (zero_tsih)
1405                                 goto new_sess_out;
1406                         else
1407                                 goto old_sess_out;
1408                 }
1409         }
1410
1411         ret = iscsi_target_start_negotiation(login, conn);
1412         if (ret < 0)
1413                 goto new_sess_out;
1414
1415         iscsi_stop_login_thread_timer(np);
1416
1417         if (ret == 1) {
1418                 tpg_np = conn->tpg_np;
1419
1420                 iscsi_post_login_handler(np, conn, zero_tsih);
1421                 iscsit_deaccess_np(np, tpg, tpg_np);
1422         }
1423
1424         tpg = NULL;
1425         tpg_np = NULL;
1426         /* Get another socket */
1427         return 1;
1428
1429 new_sess_out:
1430         new_sess = true;
1431 old_sess_out:
1432         tpg_np = conn->tpg_np;
1433         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1434         new_sess = false;
1435
1436         if (tpg) {
1437                 iscsit_deaccess_np(np, tpg, tpg_np);
1438                 tpg = NULL;
1439                 tpg_np = NULL;
1440         }
1441
1442         return 1;
1443
1444 exit:
1445         iscsi_stop_login_thread_timer(np);
1446         spin_lock_bh(&np->np_thread_lock);
1447         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1448         spin_unlock_bh(&np->np_thread_lock);
1449
1450         return 0;
1451 }
1452
1453 int iscsi_target_login_thread(void *arg)
1454 {
1455         struct iscsi_np *np = arg;
1456         int ret;
1457
1458         allow_signal(SIGINT);
1459
1460         while (1) {
1461                 ret = __iscsi_target_login_thread(np);
1462                 /*
1463                  * We break and exit here unless another sock_accept() call
1464                  * is expected.
1465                  */
1466                 if (ret != 1)
1467                         break;
1468         }
1469
1470         while (!kthread_should_stop()) {
1471                 msleep(100);
1472         }
1473
1474         return 0;
1475 }