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