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 <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.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 "iscsi_target_core.h"
  28 #include "iscsi_target_tq.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_stat.h"
  35 #include "iscsi_target_tpg.h"
  36 #include "iscsi_target_util.h"
  37 #include "iscsi_target.h"
  38 #include "iscsi_target_parameters.h"
  39
  40 #include <target/iscsi/iscsi_transport.h>
  41
  42 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  43 {
  44         struct iscsi_login *login;
  45
  46         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  47         if (!login) {
  48                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  49                 return NULL;
  50         }
  51         conn->login = login;
  52         login->conn = conn;
  53         login->first_request = 1;
  54
  55         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  56         if (!login->req_buf) {
  57                 pr_err("Unable to allocate memory for response buffer.\n");
  58                 goto out_login;
  59         }
  60
  61         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  62         if (!login->rsp_buf) {
  63                 pr_err("Unable to allocate memory for request buffer.\n");
  64                 goto out_req_buf;
  65         }
  66
  67         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  68         if (!conn->conn_ops) {
  69                 pr_err("Unable to allocate memory for"
  70                         " struct iscsi_conn_ops.\n");
  71                 goto out_rsp_buf;
  72         }
  73
  74         init_waitqueue_head(&conn->queues_wq);
  75         INIT_LIST_HEAD(&conn->conn_list);
  76         INIT_LIST_HEAD(&conn->conn_cmd_list);
  77         INIT_LIST_HEAD(&conn->immed_queue_list);
  78         INIT_LIST_HEAD(&conn->response_queue_list);
  79         init_completion(&conn->conn_post_wait_comp);
  80         init_completion(&conn->conn_wait_comp);
  81         init_completion(&conn->conn_wait_rcfr_comp);
  82         init_completion(&conn->conn_waiting_on_uc_comp);
  83         init_completion(&conn->conn_logout_comp);
  84         init_completion(&conn->rx_half_close_comp);
  85         init_completion(&conn->tx_half_close_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         /*
 119          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 120          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 121          * to software 1x8 byte slicing from crc32c.ko
 122          */
 123         conn->conn_rx_hash.flags = 0;
 124         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 125                                                 CRYPTO_ALG_ASYNC);
 126         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 127                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 128                 return -ENOMEM;
 129         }
 130
 131         conn->conn_tx_hash.flags = 0;
 132         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 133                                                 CRYPTO_ALG_ASYNC);
 134         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 135                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 136                 crypto_free_hash(conn->conn_rx_hash.tfm);
 137                 return -ENOMEM;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int iscsi_login_check_initiator_version(
 144         struct iscsi_conn *conn,
 145         u8 version_max,
 146         u8 version_min)
 147 {
 148         if ((version_max != 0x00) || (version_min != 0x00)) {
 149                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 150                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 151                         version_min, version_max);
 152                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 153                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 154                 return -1;
 155         }
 156
 157         return 0;
 158 }
 159
 160 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 161 {
 162         int sessiontype;
 163         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 164         struct iscsi_portal_group *tpg = conn->tpg;
 165         struct iscsi_session *sess = NULL, *sess_p = NULL;
 166         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 167         struct se_session *se_sess, *se_sess_tmp;
 168
 169         initiatorname_param = iscsi_find_param_from_key(
 170                         INITIATORNAME, conn->param_list);
 171         sessiontype_param = iscsi_find_param_from_key(
 172                         SESSIONTYPE, conn->param_list);
 173         if (!initiatorname_param || !sessiontype_param) {
 174                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 175                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 176                 return -1;
 177         }
 178
 179         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 180
 181         spin_lock_bh(&se_tpg->session_lock);
 182         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 183                         sess_list) {
 184
 185                 sess_p = se_sess->fabric_sess_ptr;
 186                 spin_lock(&sess_p->conn_lock);
 187                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 188                     atomic_read(&sess_p->session_logout) ||
 189                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 190                         spin_unlock(&sess_p->conn_lock);
 191                         continue;
 192                 }
 193                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 194                    (!strcmp(sess_p->sess_ops->InitiatorName,
 195                             initiatorname_param->value) &&
 196                    (sess_p->sess_ops->SessionType == sessiontype))) {
 197                         atomic_set(&sess_p->session_reinstatement, 1);
 198                         spin_unlock(&sess_p->conn_lock);
 199                         iscsit_inc_session_usage_count(sess_p);
 200                         iscsit_stop_time2retain_timer(sess_p);
 201                         sess = sess_p;
 202                         break;
 203                 }
 204                 spin_unlock(&sess_p->conn_lock);
 205         }
 206         spin_unlock_bh(&se_tpg->session_lock);
 207         /*
 208          * If the Time2Retain handler has expired, the session is already gone.
 209          */
 210         if (!sess)
 211                 return 0;
 212
 213         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 214                 " preforming session reinstatement.\n", (sessiontype) ?
 215                 "Discovery" : "Normal", sess->sid,
 216                 sess->sess_ops->InitiatorName);
 217
 218         spin_lock_bh(&sess->conn_lock);
 219         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 220                 spin_unlock_bh(&sess->conn_lock);
 221                 iscsit_dec_session_usage_count(sess);
 222                 target_put_session(sess->se_sess);
 223                 return 0;
 224         }
 225         spin_unlock_bh(&sess->conn_lock);
 226
 227         iscsit_stop_session(sess, 1, 1);
 228         iscsit_dec_session_usage_count(sess);
 229
 230         target_put_session(sess->se_sess);
 231         return 0;
 232 }
 233
 234 static void iscsi_login_set_conn_values(
 235         struct iscsi_session *sess,
 236         struct iscsi_conn *conn,
 237         __be16 cid)
 238 {
 239         conn->sess              = sess;
 240         conn->cid               = be16_to_cpu(cid);
 241         /*
 242          * Generate a random Status sequence number (statsn) for the new
 243          * iSCSI connection.
 244          */
 245         get_random_bytes(&conn->stat_sn, sizeof(u32));
 246
 247         mutex_lock(&auth_id_lock);
 248         conn->auth_id           = iscsit_global->auth_id++;
 249         mutex_unlock(&auth_id_lock);
 250 }
 251
 252 /*
 253  *      This is the leading connection of a new session,
 254  *      or session reinstatement.
 255  */
 256 static int iscsi_login_zero_tsih_s1(
 257         struct iscsi_conn *conn,
 258         unsigned char *buf)
 259 {
 260         struct iscsi_session *sess = NULL;
 261         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 262         enum target_prot_op sup_pro_ops;
 263         int ret;
 264
 265         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 266         if (!sess) {
 267                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 268                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 269                 pr_err("Could not allocate memory for session\n");
 270                 return -ENOMEM;
 271         }
 272
 273         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 274         sess->init_task_tag     = pdu->itt;
 275         memcpy(&sess->isid, pdu->isid, 6);
 276         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 277         INIT_LIST_HEAD(&sess->sess_conn_list);
 278         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 279         INIT_LIST_HEAD(&sess->cr_active_list);
 280         INIT_LIST_HEAD(&sess->cr_inactive_list);
 281         init_completion(&sess->async_msg_comp);
 282         init_completion(&sess->reinstatement_comp);
 283         init_completion(&sess->session_wait_comp);
 284         init_completion(&sess->session_waiting_on_uc_comp);
 285         mutex_init(&sess->cmdsn_mutex);
 286         spin_lock_init(&sess->conn_lock);
 287         spin_lock_init(&sess->cr_a_lock);
 288         spin_lock_init(&sess->cr_i_lock);
 289         spin_lock_init(&sess->session_usage_lock);
 290         spin_lock_init(&sess->ttt_lock);
 291
 292         idr_preload(GFP_KERNEL);
 293         spin_lock_bh(&sess_idr_lock);
 294         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 295         if (ret >= 0)
 296                 sess->session_index = ret;
 297         spin_unlock_bh(&sess_idr_lock);
 298         idr_preload_end();
 299
 300         if (ret < 0) {
 301                 pr_err("idr_alloc() for sess_idr failed\n");
 302                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 303                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 304                 kfree(sess);
 305                 return -ENOMEM;
 306         }
 307
 308         sess->creation_time = get_jiffies_64();
 309         /*
 310          * The FFP CmdSN window values will be allocated from the TPG's
 311          * Initiator Node's ACL once the login has been successfully completed.
 312          */
 313         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 314
 315         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 316         if (!sess->sess_ops) {
 317                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 318                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 319                 pr_err("Unable to allocate memory for"
 320                                 " struct iscsi_sess_ops.\n");
 321                 kfree(sess);
 322                 return -ENOMEM;
 323         }
 324         sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
 325
 326         sess->se_sess = transport_init_session(sup_pro_ops);
 327         if (IS_ERR(sess->se_sess)) {
 328                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 329                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 330                 kfree(sess);
 331                 return -ENOMEM;
 332         }
 333
 334         return 0;
 335 }
 336
 337 static int iscsi_login_zero_tsih_s2(
 338         struct iscsi_conn *conn)
 339 {
 340         struct iscsi_node_attrib *na;
 341         struct iscsi_session *sess = conn->sess;
 342         unsigned char buf[32];
 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         memset(buf, 0, 32);
 384         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 385         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 386                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 387                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 388                 return -1;
 389         }
 390
 391         /*
 392          * Workaround for Initiators that have broken connection recovery logic.
 393          *
 394          * "We would really like to get rid of this." Linux-iSCSI.org team
 395          */
 396         memset(buf, 0, 32);
 397         sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
 398         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 399                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 400                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 401                 return -1;
 402         }
 403
 404         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 405                 return -1;
 406         /*
 407          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 408          */
 409         if (iser) {
 410                 struct iscsi_param *param;
 411                 unsigned long mrdsl, off;
 412                 int rc;
 413
 414                 sprintf(buf, "RDMAExtensions=Yes");
 415                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 416                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 417                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 418                         return -1;
 419                 }
 420                 /*
 421                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 422                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 423                  */
 424                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 425                                                   conn->param_list);
 426                 if (!param) {
 427                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 428                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 429                         return -1;
 430                 }
 431                 rc = kstrtoul(param->value, 0, &mrdsl);
 432                 if (rc < 0) {
 433                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 434                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 435                         return -1;
 436                 }
 437                 off = mrdsl % PAGE_SIZE;
 438                 if (!off)
 439                         goto check_prot;
 440
 441                 if (mrdsl < PAGE_SIZE)
 442                         mrdsl = PAGE_SIZE;
 443                 else
 444                         mrdsl -= off;
 445
 446                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 447                         " to PAGE_SIZE\n", mrdsl);
 448
 449                 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
 450                 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 451                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 452                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 453                         return -1;
 454                 }
 455                 /*
 456                  * ISER currently requires that ImmediateData + Unsolicited
 457                  * Data be disabled when protection / signature MRs are enabled.
 458                  */
 459 check_prot:
 460                 if (sess->se_sess->sup_prot_ops &
 461                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 462                     TARGET_PROT_DOUT_INSERT)) {
 463
 464                         sprintf(buf, "ImmediateData=No");
 465                         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 466                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 467                                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
 468                                 return -1;
 469                         }
 470
 471                         sprintf(buf, "InitialR2T=Yes");
 472                         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 473                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 474                                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
 475                                 return -1;
 476                         }
 477                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 478                                  " T10-PI enabled ISER session\n");
 479                 }
 480         }
 481
 482         return 0;
 483 }
 484
 485 /*
 486  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 487  * The Initiator node will be able to enable FIM by proposing them itself.
 488  */
 489 int iscsi_login_disable_FIM_keys(
 490         struct iscsi_param_list *param_list,
 491         struct iscsi_conn *conn)
 492 {
 493         struct iscsi_param *param;
 494
 495         param = iscsi_find_param_from_key("OFMarker", param_list);
 496         if (!param) {
 497                 pr_err("iscsi_find_param_from_key() for"
 498                                 " OFMarker failed\n");
 499                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 500                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 501                 return -1;
 502         }
 503         param->state &= ~PSTATE_NEGOTIATE;
 504
 505         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 506         if (!param) {
 507                 pr_err("iscsi_find_param_from_key() for"
 508                                 " IFMarker failed\n");
 509                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 510                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 511                 return -1;
 512         }
 513         param->state &= ~PSTATE_NEGOTIATE;
 514
 515         param = iscsi_find_param_from_key("IFMarker", param_list);
 516         if (!param) {
 517                 pr_err("iscsi_find_param_from_key() for"
 518                                 " IFMarker failed\n");
 519                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 520                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 521                 return -1;
 522         }
 523         param->state &= ~PSTATE_NEGOTIATE;
 524
 525         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 526         if (!param) {
 527                 pr_err("iscsi_find_param_from_key() for"
 528                                 " IFMarker failed\n");
 529                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 530                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 531                 return -1;
 532         }
 533         param->state &= ~PSTATE_NEGOTIATE;
 534
 535         return 0;
 536 }
 537
 538 static int iscsi_login_non_zero_tsih_s1(
 539         struct iscsi_conn *conn,
 540         unsigned char *buf)
 541 {
 542         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 543
 544         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 545         return 0;
 546 }
 547
 548 /*
 549  *      Add a new connection to an existing session.
 550  */
 551 static int iscsi_login_non_zero_tsih_s2(
 552         struct iscsi_conn *conn,
 553         unsigned char *buf)
 554 {
 555         struct iscsi_portal_group *tpg = conn->tpg;
 556         struct iscsi_session *sess = NULL, *sess_p = NULL;
 557         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 558         struct se_session *se_sess, *se_sess_tmp;
 559         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 560         bool iser = false;
 561
 562         spin_lock_bh(&se_tpg->session_lock);
 563         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 564                         sess_list) {
 565
 566                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 567                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 568                     atomic_read(&sess_p->session_logout) ||
 569                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 570                         continue;
 571                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 572                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 573                         iscsit_inc_session_usage_count(sess_p);
 574                         iscsit_stop_time2retain_timer(sess_p);
 575                         sess = sess_p;
 576                         break;
 577                 }
 578         }
 579         spin_unlock_bh(&se_tpg->session_lock);
 580
 581         /*
 582          * If the Time2Retain handler has expired, the session is already gone.
 583          */
 584         if (!sess) {
 585                 pr_err("Initiator attempting to add a connection to"
 586                         " a non-existent session, rejecting iSCSI Login.\n");
 587                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 588                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 589                 return -1;
 590         }
 591
 592         /*
 593          * Stop the Time2Retain timer if this is a failed session, we restart
 594          * the timer if the login is not successful.
 595          */
 596         spin_lock_bh(&sess->conn_lock);
 597         if (sess->session_state == TARG_SESS_STATE_FAILED)
 598                 atomic_set(&sess->session_continuation, 1);
 599         spin_unlock_bh(&sess->conn_lock);
 600
 601         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 602
 603         if (iscsi_copy_param_list(&conn->param_list,
 604                         conn->tpg->param_list, 0) < 0) {
 605                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 606                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 607                 return -1;
 608         }
 609
 610         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 611                 iser = true;
 612
 613         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 614         /*
 615          * Need to send TargetPortalGroupTag back in first login response
 616          * on any iSCSI connection where the Initiator provides TargetName.
 617          * See 5.3.1.  Login Phase Start
 618          *
 619          * In our case, we have already located the struct iscsi_tiqn at this point.
 620          */
 621         memset(buf, 0, 32);
 622         sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
 623         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 624                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 625                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 626                 return -1;
 627         }
 628
 629         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 630 }
 631
 632 int iscsi_login_post_auth_non_zero_tsih(
 633         struct iscsi_conn *conn,
 634         u16 cid,
 635         u32 exp_statsn)
 636 {
 637         struct iscsi_conn *conn_ptr = NULL;
 638         struct iscsi_conn_recovery *cr = NULL;
 639         struct iscsi_session *sess = conn->sess;
 640
 641         /*
 642          * By following item 5 in the login table,  if we have found
 643          * an existing ISID and a valid/existing TSIH and an existing
 644          * CID we do connection reinstatement.  Currently we dont not
 645          * support it so we send back an non-zero status class to the
 646          * initiator and release the new connection.
 647          */
 648         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 649         if (conn_ptr) {
 650                 pr_err("Connection exists with CID %hu for %s,"
 651                         " performing connection reinstatement.\n",
 652                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 653
 654                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 655                 iscsit_dec_conn_usage_count(conn_ptr);
 656         }
 657
 658         /*
 659          * Check for any connection recovery entires containing CID.
 660          * We use the original ExpStatSN sent in the first login request
 661          * to acknowledge commands for the failed connection.
 662          *
 663          * Also note that an explict logout may have already been sent,
 664          * but the response may not be sent due to additional connection
 665          * loss.
 666          */
 667         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 668                 cr = iscsit_get_inactive_connection_recovery_entry(
 669                                 sess, cid);
 670                 if (cr) {
 671                         pr_debug("Performing implicit logout"
 672                                 " for connection recovery on CID: %hu\n",
 673                                         conn->cid);
 674                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 675                 }
 676         }
 677
 678         /*
 679          * Else we follow item 4 from the login table in that we have
 680          * found an existing ISID and a valid/existing TSIH and a new
 681          * CID we go ahead and continue to add a new connection to the
 682          * session.
 683          */
 684         pr_debug("Adding CID %hu to existing session for %s.\n",
 685                         cid, sess->sess_ops->InitiatorName);
 686
 687         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 688                 pr_err("Adding additional connection to this session"
 689                         " would exceed MaxConnections %d, login failed.\n",
 690                                 sess->sess_ops->MaxConnections);
 691                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 692                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 693                 return -1;
 694         }
 695
 696         return 0;
 697 }
 698
 699 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 700 {
 701         struct iscsi_session *sess = conn->sess;
 702         /*
 703          * FIXME: Unsolicitied NopIN support for ISER
 704          */
 705         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 706                 return;
 707
 708         if (!sess->sess_ops->SessionType)
 709                 iscsit_start_nopin_timer(conn);
 710 }
 711
 712 int iscsi_post_login_handler(
 713         struct iscsi_np *np,
 714         struct iscsi_conn *conn,
 715         u8 zero_tsih)
 716 {
 717         int stop_timer = 0;
 718         struct iscsi_session *sess = conn->sess;
 719         struct se_session *se_sess = sess->se_sess;
 720         struct iscsi_portal_group *tpg = sess->tpg;
 721         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 722         struct iscsi_thread_set *ts;
 723
 724         iscsit_inc_conn_usage_count(conn);
 725
 726         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 727                         ISCSI_LOGIN_STATUS_ACCEPT);
 728
 729         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 730         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 731
 732         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 733         iscsit_set_sync_and_steering_values(conn);
 734         /*
 735          * SCSI Initiator -> SCSI Target Port Mapping
 736          */
 737         ts = iscsi_get_thread_set();
 738         if (!zero_tsih) {
 739                 iscsi_set_session_parameters(sess->sess_ops,
 740                                 conn->param_list, 0);
 741                 iscsi_release_param_list(conn->param_list);
 742                 conn->param_list = NULL;
 743
 744                 spin_lock_bh(&sess->conn_lock);
 745                 atomic_set(&sess->session_continuation, 0);
 746                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 747                         pr_debug("Moving to"
 748                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 749                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 750                         stop_timer = 1;
 751                 }
 752
 753                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 754                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 755                         conn->local_ip, conn->local_port, tpg->tpgt);
 756
 757                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 758                 atomic_inc(&sess->nconn);
 759                 pr_debug("Incremented iSCSI Connection count to %hu"
 760                         " from node: %s\n", atomic_read(&sess->nconn),
 761                         sess->sess_ops->InitiatorName);
 762                 spin_unlock_bh(&sess->conn_lock);
 763
 764                 iscsi_post_login_start_timers(conn);
 765
 766                 iscsi_activate_thread_set(conn, ts);
 767                 /*
 768                  * Determine CPU mask to ensure connection's RX and TX kthreads
 769                  * are scheduled on the same CPU.
 770                  */
 771                 iscsit_thread_get_cpumask(conn);
 772                 conn->conn_rx_reset_cpumask = 1;
 773                 conn->conn_tx_reset_cpumask = 1;
 774
 775                 iscsit_dec_conn_usage_count(conn);
 776                 if (stop_timer) {
 777                         spin_lock_bh(&se_tpg->session_lock);
 778                         iscsit_stop_time2retain_timer(sess);
 779                         spin_unlock_bh(&se_tpg->session_lock);
 780                 }
 781                 iscsit_dec_session_usage_count(sess);
 782                 return 0;
 783         }
 784
 785         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 786         iscsi_release_param_list(conn->param_list);
 787         conn->param_list = NULL;
 788
 789         iscsit_determine_maxcmdsn(sess);
 790
 791         spin_lock_bh(&se_tpg->session_lock);
 792         __transport_register_session(&sess->tpg->tpg_se_tpg,
 793                         se_sess->se_node_acl, se_sess, sess);
 794         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 795         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 796
 797         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 798                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 799                 tpg->tpgt);
 800
 801         spin_lock_bh(&sess->conn_lock);
 802         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 803         atomic_inc(&sess->nconn);
 804         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 805                 " %s\n", atomic_read(&sess->nconn),
 806                 sess->sess_ops->InitiatorName);
 807         spin_unlock_bh(&sess->conn_lock);
 808
 809         sess->sid = tpg->sid++;
 810         if (!sess->sid)
 811                 sess->sid = tpg->sid++;
 812         pr_debug("Established iSCSI session from node: %s\n",
 813                         sess->sess_ops->InitiatorName);
 814
 815         tpg->nsessions++;
 816         if (tpg->tpg_tiqn)
 817                 tpg->tpg_tiqn->tiqn_nsessions++;
 818
 819         pr_debug("Incremented number of active iSCSI sessions to %u on"
 820                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 821         spin_unlock_bh(&se_tpg->session_lock);
 822
 823         iscsi_post_login_start_timers(conn);
 824         iscsi_activate_thread_set(conn, ts);
 825         /*
 826          * Determine CPU mask to ensure connection's RX and TX kthreads
 827          * are scheduled on the same CPU.
 828          */
 829         iscsit_thread_get_cpumask(conn);
 830         conn->conn_rx_reset_cpumask = 1;
 831         conn->conn_tx_reset_cpumask = 1;
 832
 833         iscsit_dec_conn_usage_count(conn);
 834
 835         return 0;
 836 }
 837
 838 static void iscsi_handle_login_thread_timeout(unsigned long data)
 839 {
 840         struct iscsi_np *np = (struct iscsi_np *) data;
 841
 842         spin_lock_bh(&np->np_thread_lock);
 843         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 844                         np->np_ip, np->np_port);
 845
 846         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 847                 spin_unlock_bh(&np->np_thread_lock);
 848                 return;
 849         }
 850
 851         if (np->np_thread)
 852                 send_sig(SIGINT, np->np_thread, 1);
 853
 854         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 855         spin_unlock_bh(&np->np_thread_lock);
 856 }
 857
 858 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 859 {
 860         /*
 861          * This used the TA_LOGIN_TIMEOUT constant because at this
 862          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 863          */
 864         spin_lock_bh(&np->np_thread_lock);
 865         init_timer(&np->np_login_timer);
 866         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 867         np->np_login_timer.data = (unsigned long)np;
 868         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 869         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 870         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 871         add_timer(&np->np_login_timer);
 872
 873         pr_debug("Added timeout timer to iSCSI login request for"
 874                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 875         spin_unlock_bh(&np->np_thread_lock);
 876 }
 877
 878 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 879 {
 880         spin_lock_bh(&np->np_thread_lock);
 881         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 882                 spin_unlock_bh(&np->np_thread_lock);
 883                 return;
 884         }
 885         np->np_login_timer_flags |= ISCSI_TF_STOP;
 886         spin_unlock_bh(&np->np_thread_lock);
 887
 888         del_timer_sync(&np->np_login_timer);
 889
 890         spin_lock_bh(&np->np_thread_lock);
 891         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 892         spin_unlock_bh(&np->np_thread_lock);
 893 }
 894
 895 int iscsit_setup_np(
 896         struct iscsi_np *np,
 897         struct __kernel_sockaddr_storage *sockaddr)
 898 {
 899         struct socket *sock = NULL;
 900         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 901
 902         switch (np->np_network_transport) {
 903         case ISCSI_TCP:
 904                 np->np_ip_proto = IPPROTO_TCP;
 905                 np->np_sock_type = SOCK_STREAM;
 906                 break;
 907         case ISCSI_SCTP_TCP:
 908                 np->np_ip_proto = IPPROTO_SCTP;
 909                 np->np_sock_type = SOCK_STREAM;
 910                 break;
 911         case ISCSI_SCTP_UDP:
 912                 np->np_ip_proto = IPPROTO_SCTP;
 913                 np->np_sock_type = SOCK_SEQPACKET;
 914                 break;
 915         default:
 916                 pr_err("Unsupported network_transport: %d\n",
 917                                 np->np_network_transport);
 918                 return -EINVAL;
 919         }
 920
 921         np->np_ip_proto = IPPROTO_TCP;
 922         np->np_sock_type = SOCK_STREAM;
 923
 924         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 925                         np->np_ip_proto, &sock);
 926         if (ret < 0) {
 927                 pr_err("sock_create() failed.\n");
 928                 return ret;
 929         }
 930         np->np_socket = sock;
 931         /*
 932          * Setup the np->np_sockaddr from the passed sockaddr setup
 933          * in iscsi_target_configfs.c code..
 934          */
 935         memcpy(&np->np_sockaddr, sockaddr,
 936                         sizeof(struct __kernel_sockaddr_storage));
 937
 938         if (sockaddr->ss_family == AF_INET6)
 939                 len = sizeof(struct sockaddr_in6);
 940         else
 941                 len = sizeof(struct sockaddr_in);
 942         /*
 943          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 944          */
 945         /* FIXME: Someone please explain why this is endian-safe */
 946         opt = 1;
 947         if (np->np_network_transport == ISCSI_TCP) {
 948                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 949                                 (char *)&opt, sizeof(opt));
 950                 if (ret < 0) {
 951                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 952                                 " failed: %d\n", ret);
 953                         goto fail;
 954                 }
 955         }
 956
 957         /* FIXME: Someone please explain why this is endian-safe */
 958         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 959                         (char *)&opt, sizeof(opt));
 960         if (ret < 0) {
 961                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 962                         " failed\n");
 963                 goto fail;
 964         }
 965
 966         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 967                         (char *)&opt, sizeof(opt));
 968         if (ret < 0) {
 969                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 970                         " failed\n");
 971                 goto fail;
 972         }
 973
 974         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 975         if (ret < 0) {
 976                 pr_err("kernel_bind() failed: %d\n", ret);
 977                 goto fail;
 978         }
 979
 980         ret = kernel_listen(sock, backlog);
 981         if (ret != 0) {
 982                 pr_err("kernel_listen() failed: %d\n", ret);
 983                 goto fail;
 984         }
 985
 986         return 0;
 987 fail:
 988         np->np_socket = NULL;
 989         if (sock)
 990                 sock_release(sock);
 991         return ret;
 992 }
 993
 994 int iscsi_target_setup_login_socket(
 995         struct iscsi_np *np,
 996         struct __kernel_sockaddr_storage *sockaddr)
 997 {
 998         struct iscsit_transport *t;
 999         int rc;
1000
1001         t = iscsit_get_transport(np->np_network_transport);
1002         if (!t)
1003                 return -EINVAL;
1004
1005         rc = t->iscsit_setup_np(np, sockaddr);
1006         if (rc < 0) {
1007                 iscsit_put_transport(t);
1008                 return rc;
1009         }
1010
1011         np->np_transport = t;
1012         np->enabled = true;
1013         return 0;
1014 }
1015
1016 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1017 {
1018         struct socket *new_sock, *sock = np->np_socket;
1019         struct sockaddr_in sock_in;
1020         struct sockaddr_in6 sock_in6;
1021         int rc, err;
1022
1023         rc = kernel_accept(sock, &new_sock, 0);
1024         if (rc < 0)
1025                 return rc;
1026
1027         conn->sock = new_sock;
1028         conn->login_family = np->np_sockaddr.ss_family;
1029
1030         if (np->np_sockaddr.ss_family == AF_INET6) {
1031                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1032
1033                 rc = conn->sock->ops->getname(conn->sock,
1034                                 (struct sockaddr *)&sock_in6, &err, 1);
1035                 if (!rc) {
1036                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1037                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1038                                         &sock_in6.sin6_addr.in6_u);
1039                         else
1040                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1041                                         &sock_in6.sin6_addr.s6_addr32[3]);
1042                         conn->login_port = ntohs(sock_in6.sin6_port);
1043                 }
1044
1045                 rc = conn->sock->ops->getname(conn->sock,
1046                                 (struct sockaddr *)&sock_in6, &err, 0);
1047                 if (!rc) {
1048                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1049                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1050                                         &sock_in6.sin6_addr.in6_u);
1051                         else
1052                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1053                                         &sock_in6.sin6_addr.s6_addr32[3]);
1054                         conn->local_port = ntohs(sock_in6.sin6_port);
1055                 }
1056         } else {
1057                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1058
1059                 rc = conn->sock->ops->getname(conn->sock,
1060                                 (struct sockaddr *)&sock_in, &err, 1);
1061                 if (!rc) {
1062                         sprintf(conn->login_ip, "%pI4",
1063                                         &sock_in.sin_addr.s_addr);
1064                         conn->login_port = ntohs(sock_in.sin_port);
1065                 }
1066
1067                 rc = conn->sock->ops->getname(conn->sock,
1068                                 (struct sockaddr *)&sock_in, &err, 0);
1069                 if (!rc) {
1070                         sprintf(conn->local_ip, "%pI4",
1071                                         &sock_in.sin_addr.s_addr);
1072                         conn->local_port = ntohs(sock_in.sin_port);
1073                 }
1074         }
1075
1076         return 0;
1077 }
1078
1079 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1080 {
1081         struct iscsi_login_req *login_req;
1082         u32 padding = 0, payload_length;
1083
1084         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1085                 return -1;
1086
1087         login_req = (struct iscsi_login_req *)login->req;
1088         payload_length  = ntoh24(login_req->dlength);
1089         padding = ((-payload_length) & 3);
1090
1091         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1092                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1093                 login_req->flags, login_req->itt, login_req->cmdsn,
1094                 login_req->exp_statsn, login_req->cid, payload_length);
1095         /*
1096          * Setup the initial iscsi_login values from the leading
1097          * login request PDU.
1098          */
1099         if (login->first_request) {
1100                 login_req = (struct iscsi_login_req *)login->req;
1101                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1102                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1103                 login->version_min      = login_req->min_version;
1104                 login->version_max      = login_req->max_version;
1105                 memcpy(login->isid, login_req->isid, 6);
1106                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1107                 login->init_task_tag    = login_req->itt;
1108                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1109                 login->cid              = be16_to_cpu(login_req->cid);
1110                 login->tsih             = be16_to_cpu(login_req->tsih);
1111         }
1112
1113         if (iscsi_target_check_login_request(conn, login) < 0)
1114                 return -1;
1115
1116         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1117         if (iscsi_login_rx_data(conn, login->req_buf,
1118                                 payload_length + padding) < 0)
1119                 return -1;
1120
1121         return 0;
1122 }
1123
1124 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1125                         u32 length)
1126 {
1127         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1128                 return -1;
1129
1130         return 0;
1131 }
1132
1133 static int
1134 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1135 {
1136         int rc;
1137
1138         if (!t->owner) {
1139                 conn->conn_transport = t;
1140                 return 0;
1141         }
1142
1143         rc = try_module_get(t->owner);
1144         if (!rc) {
1145                 pr_err("try_module_get() failed for %s\n", t->name);
1146                 return -EINVAL;
1147         }
1148
1149         conn->conn_transport = t;
1150         return 0;
1151 }
1152
1153 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1154                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1155 {
1156         if (new_sess == false)
1157                 goto old_sess_out;
1158
1159         pr_err("iSCSI Login negotiation failed.\n");
1160         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1161                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1162         if (!zero_tsih || !conn->sess)
1163                 goto old_sess_out;
1164         if (conn->sess->se_sess)
1165                 transport_free_session(conn->sess->se_sess);
1166         if (conn->sess->session_index != 0) {
1167                 spin_lock_bh(&sess_idr_lock);
1168                 idr_remove(&sess_idr, conn->sess->session_index);
1169                 spin_unlock_bh(&sess_idr_lock);
1170         }
1171         kfree(conn->sess->sess_ops);
1172         kfree(conn->sess);
1173
1174 old_sess_out:
1175         iscsi_stop_login_thread_timer(np);
1176         /*
1177          * If login negotiation fails check if the Time2Retain timer
1178          * needs to be restarted.
1179          */
1180         if (!zero_tsih && conn->sess) {
1181                 spin_lock_bh(&conn->sess->conn_lock);
1182                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1183                         struct se_portal_group *se_tpg =
1184                                         &conn->tpg->tpg_se_tpg;
1185
1186                         atomic_set(&conn->sess->session_continuation, 0);
1187                         spin_unlock_bh(&conn->sess->conn_lock);
1188                         spin_lock_bh(&se_tpg->session_lock);
1189                         iscsit_start_time2retain_handler(conn->sess);
1190                         spin_unlock_bh(&se_tpg->session_lock);
1191                 } else
1192                         spin_unlock_bh(&conn->sess->conn_lock);
1193                 iscsit_dec_session_usage_count(conn->sess);
1194         }
1195
1196         if (!IS_ERR(conn->conn_rx_hash.tfm))
1197                 crypto_free_hash(conn->conn_rx_hash.tfm);
1198         if (!IS_ERR(conn->conn_tx_hash.tfm))
1199                 crypto_free_hash(conn->conn_tx_hash.tfm);
1200
1201         if (conn->conn_cpumask)
1202                 free_cpumask_var(conn->conn_cpumask);
1203
1204         kfree(conn->conn_ops);
1205
1206         if (conn->param_list) {
1207                 iscsi_release_param_list(conn->param_list);
1208                 conn->param_list = NULL;
1209         }
1210         iscsi_target_nego_release(conn);
1211
1212         if (conn->sock) {
1213                 sock_release(conn->sock);
1214                 conn->sock = NULL;
1215         }
1216
1217         if (conn->conn_transport->iscsit_free_conn)
1218                 conn->conn_transport->iscsit_free_conn(conn);
1219
1220         iscsit_put_transport(conn->conn_transport);
1221         kfree(conn);
1222 }
1223
1224 static int __iscsi_target_login_thread(struct iscsi_np *np)
1225 {
1226         u8 *buffer, zero_tsih = 0;
1227         int ret = 0, rc, stop;
1228         struct iscsi_conn *conn = NULL;
1229         struct iscsi_login *login;
1230         struct iscsi_portal_group *tpg = NULL;
1231         struct iscsi_login_req *pdu;
1232         struct iscsi_tpg_np *tpg_np;
1233         bool new_sess = false;
1234
1235         flush_signals(current);
1236
1237         spin_lock_bh(&np->np_thread_lock);
1238         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1239                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1240                 complete(&np->np_restart_comp);
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                         if (ret == -ENODEV)
1277                                 goto out;
1278                         /* Get another socket */
1279                         return 1;
1280                 }
1281                 spin_unlock_bh(&np->np_thread_lock);
1282                 iscsit_put_transport(conn->conn_transport);
1283                 kfree(conn);
1284                 conn = NULL;
1285                 goto out;
1286         }
1287         /*
1288          * Perform the remaining iSCSI connection initialization items..
1289          */
1290         login = iscsi_login_init_conn(conn);
1291         if (!login) {
1292                 goto new_sess_out;
1293         }
1294
1295         iscsi_start_login_thread_timer(np);
1296
1297         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1298         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1299         /*
1300          * This will process the first login request + payload..
1301          */
1302         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1303         if (rc == 1)
1304                 return 1;
1305         else if (rc < 0)
1306                 goto new_sess_out;
1307
1308         buffer = &login->req[0];
1309         pdu = (struct iscsi_login_req *)buffer;
1310         /*
1311          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1312          * when Status-Class != 0.
1313         */
1314         conn->login_itt = pdu->itt;
1315
1316         spin_lock_bh(&np->np_thread_lock);
1317         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1318                 spin_unlock_bh(&np->np_thread_lock);
1319                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1320                         " active.\n", np->np_ip, np->np_port);
1321                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1322                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1323                 goto new_sess_out;
1324         }
1325         spin_unlock_bh(&np->np_thread_lock);
1326
1327         conn->network_transport = np->np_network_transport;
1328
1329         pr_debug("Received iSCSI login request from %s on %s Network"
1330                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1331                 conn->local_ip, conn->local_port);
1332
1333         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1334         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1335
1336         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1337                         pdu->min_version) < 0)
1338                 goto new_sess_out;
1339
1340         zero_tsih = (pdu->tsih == 0x0000);
1341         if (zero_tsih) {
1342                 /*
1343                  * This is the leading connection of a new session.
1344                  * We wait until after authentication to check for
1345                  * session reinstatement.
1346                  */
1347                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1348                         goto new_sess_out;
1349         } else {
1350                 /*
1351                  * Add a new connection to an existing session.
1352                  * We check for a non-existant session in
1353                  * iscsi_login_non_zero_tsih_s2() below based
1354                  * on ISID/TSIH, but wait until after authentication
1355                  * to check for connection reinstatement, etc.
1356                  */
1357                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1358                         goto new_sess_out;
1359         }
1360         /*
1361          * SessionType: Discovery
1362          *
1363          *      Locates Default Portal
1364          *
1365          * SessionType: Normal
1366          *
1367          *      Locates Target Portal from NP -> Target IQN
1368          */
1369         rc = iscsi_target_locate_portal(np, conn, login);
1370         if (rc < 0) {
1371                 tpg = conn->tpg;
1372                 goto new_sess_out;
1373         }
1374         login->zero_tsih = zero_tsih;
1375
1376         tpg = conn->tpg;
1377         if (!tpg) {
1378                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1379                 goto new_sess_out;
1380         }
1381
1382         if (zero_tsih) {
1383                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1384                         goto new_sess_out;
1385         } else {
1386                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1387                         goto old_sess_out;
1388         }
1389
1390         ret = iscsi_target_start_negotiation(login, conn);
1391         if (ret < 0)
1392                 goto new_sess_out;
1393
1394         if (!conn->sess) {
1395                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1396                 goto new_sess_out;
1397         }
1398
1399         iscsi_stop_login_thread_timer(np);
1400
1401         if (signal_pending(current))
1402                 goto new_sess_out;
1403
1404         if (ret == 1) {
1405                 tpg_np = conn->tpg_np;
1406
1407                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1408                 if (ret < 0)
1409                         goto new_sess_out;
1410
1411                 iscsit_deaccess_np(np, tpg, tpg_np);
1412         }
1413
1414         tpg = NULL;
1415         tpg_np = NULL;
1416         /* Get another socket */
1417         return 1;
1418
1419 new_sess_out:
1420         new_sess = true;
1421 old_sess_out:
1422         tpg_np = conn->tpg_np;
1423         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1424         new_sess = false;
1425
1426         if (tpg) {
1427                 iscsit_deaccess_np(np, tpg, tpg_np);
1428                 tpg = NULL;
1429                 tpg_np = NULL;
1430         }
1431
1432 out:
1433         stop = kthread_should_stop();
1434         /* Wait for another socket.. */
1435         if (!stop)
1436                 return 1;
1437 exit:
1438         iscsi_stop_login_thread_timer(np);
1439         spin_lock_bh(&np->np_thread_lock);
1440         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1441         spin_unlock_bh(&np->np_thread_lock);
1442
1443         return 0;
1444 }
1445
1446 int iscsi_target_login_thread(void *arg)
1447 {
1448         struct iscsi_np *np = arg;
1449         int ret;
1450
1451         allow_signal(SIGINT);
1452
1453         while (!kthread_should_stop()) {
1454                 ret = __iscsi_target_login_thread(np);
1455                 /*
1456                  * We break and exit here unless another sock_accept() call
1457                  * is expected.
1458                  */
1459                 if (ret != 1)
1460                         break;
1461         }
1462
1463         return 0;
1464 }