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 <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         spin_lock_init(&conn->cmd_lock);
  86         spin_lock_init(&conn->conn_usage_lock);
  87         spin_lock_init(&conn->immed_queue_lock);
  88         spin_lock_init(&conn->nopin_timer_lock);
  89         spin_lock_init(&conn->response_queue_lock);
  90         spin_lock_init(&conn->state_lock);
  91
  92         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  93                 pr_err("Unable to allocate conn->conn_cpumask\n");
  94                 goto out_conn_ops;
  95         }
  96         conn->conn_login = login;
  97
  98         return login;
  99
 100 out_conn_ops:
 101         kfree(conn->conn_ops);
 102 out_rsp_buf:
 103         kfree(login->rsp_buf);
 104 out_req_buf:
 105         kfree(login->req_buf);
 106 out_login:
 107         kfree(login);
 108         return NULL;
 109 }
 110
 111 /*
 112  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 113  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 114  */
 115 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 116 {
 117         /*
 118          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 119          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 120          * to software 1x8 byte slicing from crc32c.ko
 121          */
 122         conn->conn_rx_hash.flags = 0;
 123         conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 124                                                 CRYPTO_ALG_ASYNC);
 125         if (IS_ERR(conn->conn_rx_hash.tfm)) {
 126                 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
 127                 return -ENOMEM;
 128         }
 129
 130         conn->conn_tx_hash.flags = 0;
 131         conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
 132                                                 CRYPTO_ALG_ASYNC);
 133         if (IS_ERR(conn->conn_tx_hash.tfm)) {
 134                 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
 135                 crypto_free_hash(conn->conn_rx_hash.tfm);
 136                 return -ENOMEM;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int iscsi_login_check_initiator_version(
 143         struct iscsi_conn *conn,
 144         u8 version_max,
 145         u8 version_min)
 146 {
 147         if ((version_max != 0x00) || (version_min != 0x00)) {
 148                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 149                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 150                         version_min, version_max);
 151                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 152                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 153                 return -1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 160 {
 161         int sessiontype;
 162         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 163         struct iscsi_portal_group *tpg = conn->tpg;
 164         struct iscsi_session *sess = NULL, *sess_p = NULL;
 165         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 166         struct se_session *se_sess, *se_sess_tmp;
 167
 168         initiatorname_param = iscsi_find_param_from_key(
 169                         INITIATORNAME, conn->param_list);
 170         sessiontype_param = iscsi_find_param_from_key(
 171                         SESSIONTYPE, conn->param_list);
 172         if (!initiatorname_param || !sessiontype_param) {
 173                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 174                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 175                 return -1;
 176         }
 177
 178         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 179
 180         spin_lock_bh(&se_tpg->session_lock);
 181         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 182                         sess_list) {
 183
 184                 sess_p = se_sess->fabric_sess_ptr;
 185                 spin_lock(&sess_p->conn_lock);
 186                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 187                     atomic_read(&sess_p->session_logout) ||
 188                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 189                         spin_unlock(&sess_p->conn_lock);
 190                         continue;
 191                 }
 192                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 193                    (!strcmp(sess_p->sess_ops->InitiatorName,
 194                             initiatorname_param->value) &&
 195                    (sess_p->sess_ops->SessionType == sessiontype))) {
 196                         atomic_set(&sess_p->session_reinstatement, 1);
 197                         spin_unlock(&sess_p->conn_lock);
 198                         iscsit_inc_session_usage_count(sess_p);
 199                         iscsit_stop_time2retain_timer(sess_p);
 200                         sess = sess_p;
 201                         break;
 202                 }
 203                 spin_unlock(&sess_p->conn_lock);
 204         }
 205         spin_unlock_bh(&se_tpg->session_lock);
 206         /*
 207          * If the Time2Retain handler has expired, the session is already gone.
 208          */
 209         if (!sess)
 210                 return 0;
 211
 212         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 213                 " preforming session reinstatement.\n", (sessiontype) ?
 214                 "Discovery" : "Normal", sess->sid,
 215                 sess->sess_ops->InitiatorName);
 216
 217         spin_lock_bh(&sess->conn_lock);
 218         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 219                 spin_unlock_bh(&sess->conn_lock);
 220                 iscsit_dec_session_usage_count(sess);
 221                 target_put_session(sess->se_sess);
 222                 return 0;
 223         }
 224         spin_unlock_bh(&sess->conn_lock);
 225
 226         iscsit_stop_session(sess, 1, 1);
 227         iscsit_dec_session_usage_count(sess);
 228
 229         target_put_session(sess->se_sess);
 230         return 0;
 231 }
 232
 233 static void iscsi_login_set_conn_values(
 234         struct iscsi_session *sess,
 235         struct iscsi_conn *conn,
 236         __be16 cid)
 237 {
 238         conn->sess              = sess;
 239         conn->cid               = be16_to_cpu(cid);
 240         /*
 241          * Generate a random Status sequence number (statsn) for the new
 242          * iSCSI connection.
 243          */
 244         get_random_bytes(&conn->stat_sn, sizeof(u32));
 245
 246         mutex_lock(&auth_id_lock);
 247         conn->auth_id           = iscsit_global->auth_id++;
 248         mutex_unlock(&auth_id_lock);
 249 }
 250
 251 static __printf(2, 3) int iscsi_change_param_sprintf(
 252         struct iscsi_conn *conn,
 253         const char *fmt, ...)
 254 {
 255         va_list args;
 256         unsigned char buf[64];
 257
 258         memset(buf, 0, sizeof buf);
 259
 260         va_start(args, fmt);
 261         vsnprintf(buf, sizeof buf, fmt, args);
 262         va_end(args);
 263
 264         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 265                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 266                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 267                 return -1;
 268         }
 269
 270         return 0;
 271 }
 272
 273 /*
 274  *      This is the leading connection of a new session,
 275  *      or session reinstatement.
 276  */
 277 static int iscsi_login_zero_tsih_s1(
 278         struct iscsi_conn *conn,
 279         unsigned char *buf)
 280 {
 281         struct iscsi_session *sess = NULL;
 282         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 283         int ret;
 284
 285         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 286         if (!sess) {
 287                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 288                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 289                 pr_err("Could not allocate memory for session\n");
 290                 return -ENOMEM;
 291         }
 292
 293         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 294         sess->init_task_tag     = pdu->itt;
 295         memcpy(&sess->isid, pdu->isid, 6);
 296         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 297         INIT_LIST_HEAD(&sess->sess_conn_list);
 298         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 299         INIT_LIST_HEAD(&sess->cr_active_list);
 300         INIT_LIST_HEAD(&sess->cr_inactive_list);
 301         init_completion(&sess->async_msg_comp);
 302         init_completion(&sess->reinstatement_comp);
 303         init_completion(&sess->session_wait_comp);
 304         init_completion(&sess->session_waiting_on_uc_comp);
 305         mutex_init(&sess->cmdsn_mutex);
 306         spin_lock_init(&sess->conn_lock);
 307         spin_lock_init(&sess->cr_a_lock);
 308         spin_lock_init(&sess->cr_i_lock);
 309         spin_lock_init(&sess->session_usage_lock);
 310         spin_lock_init(&sess->ttt_lock);
 311
 312         idr_preload(GFP_KERNEL);
 313         spin_lock_bh(&sess_idr_lock);
 314         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 315         if (ret >= 0)
 316                 sess->session_index = ret;
 317         spin_unlock_bh(&sess_idr_lock);
 318         idr_preload_end();
 319
 320         if (ret < 0) {
 321                 pr_err("idr_alloc() for sess_idr failed\n");
 322                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 323                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 324                 kfree(sess);
 325                 return -ENOMEM;
 326         }
 327
 328         sess->creation_time = get_jiffies_64();
 329         /*
 330          * The FFP CmdSN window values will be allocated from the TPG's
 331          * Initiator Node's ACL once the login has been successfully completed.
 332          */
 333         sess->max_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 334
 335         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 336         if (!sess->sess_ops) {
 337                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 338                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 339                 pr_err("Unable to allocate memory for"
 340                                 " struct iscsi_sess_ops.\n");
 341                 kfree(sess);
 342                 return -ENOMEM;
 343         }
 344
 345         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 346         if (IS_ERR(sess->se_sess)) {
 347                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 348                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 349                 kfree(sess);
 350                 return -ENOMEM;
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int iscsi_login_zero_tsih_s2(
 357         struct iscsi_conn *conn)
 358 {
 359         struct iscsi_node_attrib *na;
 360         struct iscsi_session *sess = conn->sess;
 361         bool iser = false;
 362
 363         sess->tpg = conn->tpg;
 364
 365         /*
 366          * Assign a new TPG Session Handle.  Note this is protected with
 367          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 368          */
 369         sess->tsih = ++sess->tpg->ntsih;
 370         if (!sess->tsih)
 371                 sess->tsih = ++sess->tpg->ntsih;
 372
 373         /*
 374          * Create the default params from user defined values..
 375          */
 376         if (iscsi_copy_param_list(&conn->param_list,
 377                                 conn->tpg->param_list, 1) < 0) {
 378                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 379                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 380                 return -1;
 381         }
 382
 383         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 384                 iser = true;
 385
 386         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 387
 388         if (sess->sess_ops->SessionType)
 389                 return iscsi_set_keys_irrelevant_for_discovery(
 390                                 conn->param_list);
 391
 392         na = iscsit_tpg_get_node_attrib(sess);
 393
 394         /*
 395          * Need to send TargetPortalGroupTag back in first login response
 396          * on any iSCSI connection where the Initiator provides TargetName.
 397          * See 5.3.1.  Login Phase Start
 398          *
 399          * In our case, we have already located the struct iscsi_tiqn at this point.
 400          */
 401         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 402                 return -1;
 403
 404         /*
 405          * Workaround for Initiators that have broken connection recovery logic.
 406          *
 407          * "We would really like to get rid of this." Linux-iSCSI.org team
 408          */
 409         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 410                 return -1;
 411
 412         if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
 413                 return -1;
 414         /*
 415          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 416          */
 417         if (iser) {
 418                 struct iscsi_param *param;
 419                 unsigned long mrdsl, off;
 420                 int rc;
 421
 422                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 423                         return -1;
 424
 425                 /*
 426                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 427                  * Immediate Data + Unsolicitied Data-OUT if necessary..
 428                  */
 429                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 430                                                   conn->param_list);
 431                 if (!param) {
 432                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 433                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 434                         return -1;
 435                 }
 436                 rc = kstrtoul(param->value, 0, &mrdsl);
 437                 if (rc < 0) {
 438                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 439                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 440                         return -1;
 441                 }
 442                 off = mrdsl % PAGE_SIZE;
 443                 if (!off)
 444                         goto check_prot;
 445
 446                 if (mrdsl < PAGE_SIZE)
 447                         mrdsl = PAGE_SIZE;
 448                 else
 449                         mrdsl -= off;
 450
 451                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 452                         " to PAGE_SIZE\n", mrdsl);
 453
 454                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 455                         return -1;
 456                 /*
 457                  * ISER currently requires that ImmediateData + Unsolicited
 458                  * Data be disabled when protection / signature MRs are enabled.
 459                  */
 460 check_prot:
 461                 if (sess->se_sess->sup_prot_ops &
 462                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 463                     TARGET_PROT_DOUT_INSERT)) {
 464
 465                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 466                                 return -1;
 467
 468                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 469                                 return -1;
 470
 471                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 472                                  " T10-PI enabled ISER session\n");
 473                 }
 474         }
 475
 476         return 0;
 477 }
 478
 479 /*
 480  * Remove PSTATE_NEGOTIATE for the four FIM related keys.
 481  * The Initiator node will be able to enable FIM by proposing them itself.
 482  */
 483 int iscsi_login_disable_FIM_keys(
 484         struct iscsi_param_list *param_list,
 485         struct iscsi_conn *conn)
 486 {
 487         struct iscsi_param *param;
 488
 489         param = iscsi_find_param_from_key("OFMarker", param_list);
 490         if (!param) {
 491                 pr_err("iscsi_find_param_from_key() for"
 492                                 " OFMarker failed\n");
 493                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 494                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 495                 return -1;
 496         }
 497         param->state &= ~PSTATE_NEGOTIATE;
 498
 499         param = iscsi_find_param_from_key("OFMarkInt", param_list);
 500         if (!param) {
 501                 pr_err("iscsi_find_param_from_key() for"
 502                                 " IFMarker failed\n");
 503                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 504                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 505                 return -1;
 506         }
 507         param->state &= ~PSTATE_NEGOTIATE;
 508
 509         param = iscsi_find_param_from_key("IFMarker", param_list);
 510         if (!param) {
 511                 pr_err("iscsi_find_param_from_key() for"
 512                                 " IFMarker failed\n");
 513                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 514                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 515                 return -1;
 516         }
 517         param->state &= ~PSTATE_NEGOTIATE;
 518
 519         param = iscsi_find_param_from_key("IFMarkInt", param_list);
 520         if (!param) {
 521                 pr_err("iscsi_find_param_from_key() for"
 522                                 " IFMarker failed\n");
 523                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 524                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 525                 return -1;
 526         }
 527         param->state &= ~PSTATE_NEGOTIATE;
 528
 529         return 0;
 530 }
 531
 532 static int iscsi_login_non_zero_tsih_s1(
 533         struct iscsi_conn *conn,
 534         unsigned char *buf)
 535 {
 536         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 537
 538         iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 539         return 0;
 540 }
 541
 542 /*
 543  *      Add a new connection to an existing session.
 544  */
 545 static int iscsi_login_non_zero_tsih_s2(
 546         struct iscsi_conn *conn,
 547         unsigned char *buf)
 548 {
 549         struct iscsi_portal_group *tpg = conn->tpg;
 550         struct iscsi_session *sess = NULL, *sess_p = NULL;
 551         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 552         struct se_session *se_sess, *se_sess_tmp;
 553         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 554         bool iser = false;
 555
 556         spin_lock_bh(&se_tpg->session_lock);
 557         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 558                         sess_list) {
 559
 560                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 561                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 562                     atomic_read(&sess_p->session_logout) ||
 563                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 564                         continue;
 565                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 566                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 567                         iscsit_inc_session_usage_count(sess_p);
 568                         iscsit_stop_time2retain_timer(sess_p);
 569                         sess = sess_p;
 570                         break;
 571                 }
 572         }
 573         spin_unlock_bh(&se_tpg->session_lock);
 574
 575         /*
 576          * If the Time2Retain handler has expired, the session is already gone.
 577          */
 578         if (!sess) {
 579                 pr_err("Initiator attempting to add a connection to"
 580                         " a non-existent session, rejecting iSCSI Login.\n");
 581                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 582                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 583                 return -1;
 584         }
 585
 586         /*
 587          * Stop the Time2Retain timer if this is a failed session, we restart
 588          * the timer if the login is not successful.
 589          */
 590         spin_lock_bh(&sess->conn_lock);
 591         if (sess->session_state == TARG_SESS_STATE_FAILED)
 592                 atomic_set(&sess->session_continuation, 1);
 593         spin_unlock_bh(&sess->conn_lock);
 594
 595         iscsi_login_set_conn_values(sess, conn, pdu->cid);
 596
 597         if (iscsi_copy_param_list(&conn->param_list,
 598                         conn->tpg->param_list, 0) < 0) {
 599                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 600                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 601                 return -1;
 602         }
 603
 604         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 605                 iser = true;
 606
 607         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 608         /*
 609          * Need to send TargetPortalGroupTag back in first login response
 610          * on any iSCSI connection where the Initiator provides TargetName.
 611          * See 5.3.1.  Login Phase Start
 612          *
 613          * In our case, we have already located the struct iscsi_tiqn at this point.
 614          */
 615         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 616                 return -1;
 617
 618         return iscsi_login_disable_FIM_keys(conn->param_list, conn);
 619 }
 620
 621 int iscsi_login_post_auth_non_zero_tsih(
 622         struct iscsi_conn *conn,
 623         u16 cid,
 624         u32 exp_statsn)
 625 {
 626         struct iscsi_conn *conn_ptr = NULL;
 627         struct iscsi_conn_recovery *cr = NULL;
 628         struct iscsi_session *sess = conn->sess;
 629
 630         /*
 631          * By following item 5 in the login table,  if we have found
 632          * an existing ISID and a valid/existing TSIH and an existing
 633          * CID we do connection reinstatement.  Currently we dont not
 634          * support it so we send back an non-zero status class to the
 635          * initiator and release the new connection.
 636          */
 637         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 638         if (conn_ptr) {
 639                 pr_err("Connection exists with CID %hu for %s,"
 640                         " performing connection reinstatement.\n",
 641                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 642
 643                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 644                 iscsit_dec_conn_usage_count(conn_ptr);
 645         }
 646
 647         /*
 648          * Check for any connection recovery entires containing CID.
 649          * We use the original ExpStatSN sent in the first login request
 650          * to acknowledge commands for the failed connection.
 651          *
 652          * Also note that an explict logout may have already been sent,
 653          * but the response may not be sent due to additional connection
 654          * loss.
 655          */
 656         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 657                 cr = iscsit_get_inactive_connection_recovery_entry(
 658                                 sess, cid);
 659                 if (cr) {
 660                         pr_debug("Performing implicit logout"
 661                                 " for connection recovery on CID: %hu\n",
 662                                         conn->cid);
 663                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 664                 }
 665         }
 666
 667         /*
 668          * Else we follow item 4 from the login table in that we have
 669          * found an existing ISID and a valid/existing TSIH and a new
 670          * CID we go ahead and continue to add a new connection to the
 671          * session.
 672          */
 673         pr_debug("Adding CID %hu to existing session for %s.\n",
 674                         cid, sess->sess_ops->InitiatorName);
 675
 676         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 677                 pr_err("Adding additional connection to this session"
 678                         " would exceed MaxConnections %d, login failed.\n",
 679                                 sess->sess_ops->MaxConnections);
 680                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 681                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 682                 return -1;
 683         }
 684
 685         return 0;
 686 }
 687
 688 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 689 {
 690         struct iscsi_session *sess = conn->sess;
 691         /*
 692          * FIXME: Unsolicitied NopIN support for ISER
 693          */
 694         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 695                 return;
 696
 697         if (!sess->sess_ops->SessionType)
 698                 iscsit_start_nopin_timer(conn);
 699 }
 700
 701 static int iscsit_start_kthreads(struct iscsi_conn *conn)
 702 {
 703         int ret = 0;
 704
 705         spin_lock(&iscsit_global->ts_bitmap_lock);
 706         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 707                                         ISCSIT_BITMAP_BITS, get_order(1));
 708         spin_unlock(&iscsit_global->ts_bitmap_lock);
 709
 710         if (conn->bitmap_id < 0) {
 711                 pr_err("bitmap_find_free_region() failed for"
 712                        " iscsit_start_kthreads()\n");
 713                 return -ENOMEM;
 714         }
 715
 716         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 717                                       "%s", ISCSI_TX_THREAD_NAME);
 718         if (IS_ERR(conn->tx_thread)) {
 719                 pr_err("Unable to start iscsi_target_tx_thread\n");
 720                 ret = PTR_ERR(conn->tx_thread);
 721                 goto out_bitmap;
 722         }
 723         conn->tx_thread_active = true;
 724
 725         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 726                                       "%s", ISCSI_RX_THREAD_NAME);
 727         if (IS_ERR(conn->rx_thread)) {
 728                 pr_err("Unable to start iscsi_target_rx_thread\n");
 729                 ret = PTR_ERR(conn->rx_thread);
 730                 goto out_tx;
 731         }
 732         conn->rx_thread_active = true;
 733
 734         return 0;
 735 out_tx:
 736         kthread_stop(conn->tx_thread);
 737         conn->tx_thread_active = false;
 738 out_bitmap:
 739         spin_lock(&iscsit_global->ts_bitmap_lock);
 740         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 741                               get_order(1));
 742         spin_unlock(&iscsit_global->ts_bitmap_lock);
 743         return ret;
 744 }
 745
 746 int iscsi_post_login_handler(
 747         struct iscsi_np *np,
 748         struct iscsi_conn *conn,
 749         u8 zero_tsih)
 750 {
 751         int stop_timer = 0;
 752         struct iscsi_session *sess = conn->sess;
 753         struct se_session *se_sess = sess->se_sess;
 754         struct iscsi_portal_group *tpg = sess->tpg;
 755         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 756         int rc;
 757
 758         iscsit_inc_conn_usage_count(conn);
 759
 760         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 761                         ISCSI_LOGIN_STATUS_ACCEPT);
 762
 763         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 764         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 765
 766         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 767         iscsit_set_sync_and_steering_values(conn);
 768         /*
 769          * SCSI Initiator -> SCSI Target Port Mapping
 770          */
 771         if (!zero_tsih) {
 772                 iscsi_set_session_parameters(sess->sess_ops,
 773                                 conn->param_list, 0);
 774                 iscsi_release_param_list(conn->param_list);
 775                 conn->param_list = NULL;
 776
 777                 spin_lock_bh(&sess->conn_lock);
 778                 atomic_set(&sess->session_continuation, 0);
 779                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 780                         pr_debug("Moving to"
 781                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 782                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 783                         stop_timer = 1;
 784                 }
 785
 786                 pr_debug("iSCSI Login successful on CID: %hu from %s to"
 787                         " %s:%hu,%hu\n", conn->cid, conn->login_ip,
 788                         conn->local_ip, conn->local_port, tpg->tpgt);
 789
 790                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 791                 atomic_inc(&sess->nconn);
 792                 pr_debug("Incremented iSCSI Connection count to %hu"
 793                         " from node: %s\n", atomic_read(&sess->nconn),
 794                         sess->sess_ops->InitiatorName);
 795                 spin_unlock_bh(&sess->conn_lock);
 796
 797                 rc = iscsit_start_kthreads(conn);
 798                 if (rc)
 799                         return rc;
 800
 801                 iscsi_post_login_start_timers(conn);
 802                 /*
 803                  * Determine CPU mask to ensure connection's RX and TX kthreads
 804                  * are scheduled on the same CPU.
 805                  */
 806                 iscsit_thread_get_cpumask(conn);
 807                 conn->conn_rx_reset_cpumask = 1;
 808                 conn->conn_tx_reset_cpumask = 1;
 809
 810                 iscsit_dec_conn_usage_count(conn);
 811                 if (stop_timer) {
 812                         spin_lock_bh(&se_tpg->session_lock);
 813                         iscsit_stop_time2retain_timer(sess);
 814                         spin_unlock_bh(&se_tpg->session_lock);
 815                 }
 816                 iscsit_dec_session_usage_count(sess);
 817                 return 0;
 818         }
 819
 820         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 821         iscsi_release_param_list(conn->param_list);
 822         conn->param_list = NULL;
 823
 824         iscsit_determine_maxcmdsn(sess);
 825
 826         spin_lock_bh(&se_tpg->session_lock);
 827         __transport_register_session(&sess->tpg->tpg_se_tpg,
 828                         se_sess->se_node_acl, se_sess, sess);
 829         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 830         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 831
 832         pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
 833                 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
 834                 tpg->tpgt);
 835
 836         spin_lock_bh(&sess->conn_lock);
 837         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 838         atomic_inc(&sess->nconn);
 839         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 840                 " %s\n", atomic_read(&sess->nconn),
 841                 sess->sess_ops->InitiatorName);
 842         spin_unlock_bh(&sess->conn_lock);
 843
 844         sess->sid = tpg->sid++;
 845         if (!sess->sid)
 846                 sess->sid = tpg->sid++;
 847         pr_debug("Established iSCSI session from node: %s\n",
 848                         sess->sess_ops->InitiatorName);
 849
 850         tpg->nsessions++;
 851         if (tpg->tpg_tiqn)
 852                 tpg->tpg_tiqn->tiqn_nsessions++;
 853
 854         pr_debug("Incremented number of active iSCSI sessions to %u on"
 855                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 856         spin_unlock_bh(&se_tpg->session_lock);
 857
 858         rc = iscsit_start_kthreads(conn);
 859         if (rc)
 860                 return rc;
 861
 862         iscsi_post_login_start_timers(conn);
 863         /*
 864          * Determine CPU mask to ensure connection's RX and TX kthreads
 865          * are scheduled on the same CPU.
 866          */
 867         iscsit_thread_get_cpumask(conn);
 868         conn->conn_rx_reset_cpumask = 1;
 869         conn->conn_tx_reset_cpumask = 1;
 870
 871         iscsit_dec_conn_usage_count(conn);
 872
 873         return 0;
 874 }
 875
 876 static void iscsi_handle_login_thread_timeout(unsigned long data)
 877 {
 878         struct iscsi_np *np = (struct iscsi_np *) data;
 879
 880         spin_lock_bh(&np->np_thread_lock);
 881         pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
 882                         np->np_ip, np->np_port);
 883
 884         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 885                 spin_unlock_bh(&np->np_thread_lock);
 886                 return;
 887         }
 888
 889         if (np->np_thread)
 890                 send_sig(SIGINT, np->np_thread, 1);
 891
 892         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 893         spin_unlock_bh(&np->np_thread_lock);
 894 }
 895
 896 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 897 {
 898         /*
 899          * This used the TA_LOGIN_TIMEOUT constant because at this
 900          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 901          */
 902         spin_lock_bh(&np->np_thread_lock);
 903         init_timer(&np->np_login_timer);
 904         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 905         np->np_login_timer.data = (unsigned long)np;
 906         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 907         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 908         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 909         add_timer(&np->np_login_timer);
 910
 911         pr_debug("Added timeout timer to iSCSI login request for"
 912                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 913         spin_unlock_bh(&np->np_thread_lock);
 914 }
 915
 916 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 917 {
 918         spin_lock_bh(&np->np_thread_lock);
 919         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 920                 spin_unlock_bh(&np->np_thread_lock);
 921                 return;
 922         }
 923         np->np_login_timer_flags |= ISCSI_TF_STOP;
 924         spin_unlock_bh(&np->np_thread_lock);
 925
 926         del_timer_sync(&np->np_login_timer);
 927
 928         spin_lock_bh(&np->np_thread_lock);
 929         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 930         spin_unlock_bh(&np->np_thread_lock);
 931 }
 932
 933 int iscsit_setup_np(
 934         struct iscsi_np *np,
 935         struct __kernel_sockaddr_storage *sockaddr)
 936 {
 937         struct socket *sock = NULL;
 938         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 939
 940         switch (np->np_network_transport) {
 941         case ISCSI_TCP:
 942                 np->np_ip_proto = IPPROTO_TCP;
 943                 np->np_sock_type = SOCK_STREAM;
 944                 break;
 945         case ISCSI_SCTP_TCP:
 946                 np->np_ip_proto = IPPROTO_SCTP;
 947                 np->np_sock_type = SOCK_STREAM;
 948                 break;
 949         case ISCSI_SCTP_UDP:
 950                 np->np_ip_proto = IPPROTO_SCTP;
 951                 np->np_sock_type = SOCK_SEQPACKET;
 952                 break;
 953         default:
 954                 pr_err("Unsupported network_transport: %d\n",
 955                                 np->np_network_transport);
 956                 return -EINVAL;
 957         }
 958
 959         np->np_ip_proto = IPPROTO_TCP;
 960         np->np_sock_type = SOCK_STREAM;
 961
 962         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 963                         np->np_ip_proto, &sock);
 964         if (ret < 0) {
 965                 pr_err("sock_create() failed.\n");
 966                 return ret;
 967         }
 968         np->np_socket = sock;
 969         /*
 970          * Setup the np->np_sockaddr from the passed sockaddr setup
 971          * in iscsi_target_configfs.c code..
 972          */
 973         memcpy(&np->np_sockaddr, sockaddr,
 974                         sizeof(struct __kernel_sockaddr_storage));
 975
 976         if (sockaddr->ss_family == AF_INET6)
 977                 len = sizeof(struct sockaddr_in6);
 978         else
 979                 len = sizeof(struct sockaddr_in);
 980         /*
 981          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 982          */
 983         /* FIXME: Someone please explain why this is endian-safe */
 984         opt = 1;
 985         if (np->np_network_transport == ISCSI_TCP) {
 986                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 987                                 (char *)&opt, sizeof(opt));
 988                 if (ret < 0) {
 989                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 990                                 " failed: %d\n", ret);
 991                         goto fail;
 992                 }
 993         }
 994
 995         /* FIXME: Someone please explain why this is endian-safe */
 996         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 997                         (char *)&opt, sizeof(opt));
 998         if (ret < 0) {
 999                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
1000                         " failed\n");
1001                 goto fail;
1002         }
1003
1004         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
1005                         (char *)&opt, sizeof(opt));
1006         if (ret < 0) {
1007                 pr_err("kernel_setsockopt() for IP_FREEBIND"
1008                         " failed\n");
1009                 goto fail;
1010         }
1011
1012         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
1013         if (ret < 0) {
1014                 pr_err("kernel_bind() failed: %d\n", ret);
1015                 goto fail;
1016         }
1017
1018         ret = kernel_listen(sock, backlog);
1019         if (ret != 0) {
1020                 pr_err("kernel_listen() failed: %d\n", ret);
1021                 goto fail;
1022         }
1023
1024         return 0;
1025 fail:
1026         np->np_socket = NULL;
1027         sock_release(sock);
1028         return ret;
1029 }
1030
1031 int iscsi_target_setup_login_socket(
1032         struct iscsi_np *np,
1033         struct __kernel_sockaddr_storage *sockaddr)
1034 {
1035         struct iscsit_transport *t;
1036         int rc;
1037
1038         t = iscsit_get_transport(np->np_network_transport);
1039         if (!t)
1040                 return -EINVAL;
1041
1042         rc = t->iscsit_setup_np(np, sockaddr);
1043         if (rc < 0) {
1044                 iscsit_put_transport(t);
1045                 return rc;
1046         }
1047
1048         np->np_transport = t;
1049         np->enabled = true;
1050         return 0;
1051 }
1052
1053 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1054 {
1055         struct socket *new_sock, *sock = np->np_socket;
1056         struct sockaddr_in sock_in;
1057         struct sockaddr_in6 sock_in6;
1058         int rc, err;
1059
1060         rc = kernel_accept(sock, &new_sock, 0);
1061         if (rc < 0)
1062                 return rc;
1063
1064         conn->sock = new_sock;
1065         conn->login_family = np->np_sockaddr.ss_family;
1066
1067         if (np->np_sockaddr.ss_family == AF_INET6) {
1068                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1069
1070                 rc = conn->sock->ops->getname(conn->sock,
1071                                 (struct sockaddr *)&sock_in6, &err, 1);
1072                 if (!rc) {
1073                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1074                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1075                                         &sock_in6.sin6_addr.in6_u);
1076                         else
1077                                 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1078                                         &sock_in6.sin6_addr.s6_addr32[3]);
1079                         conn->login_port = ntohs(sock_in6.sin6_port);
1080                 }
1081
1082                 rc = conn->sock->ops->getname(conn->sock,
1083                                 (struct sockaddr *)&sock_in6, &err, 0);
1084                 if (!rc) {
1085                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1086                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1087                                         &sock_in6.sin6_addr.in6_u);
1088                         else
1089                                 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1090                                         &sock_in6.sin6_addr.s6_addr32[3]);
1091                         conn->local_port = ntohs(sock_in6.sin6_port);
1092                 }
1093         } else {
1094                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1095
1096                 rc = conn->sock->ops->getname(conn->sock,
1097                                 (struct sockaddr *)&sock_in, &err, 1);
1098                 if (!rc) {
1099                         sprintf(conn->login_ip, "%pI4",
1100                                         &sock_in.sin_addr.s_addr);
1101                         conn->login_port = ntohs(sock_in.sin_port);
1102                 }
1103
1104                 rc = conn->sock->ops->getname(conn->sock,
1105                                 (struct sockaddr *)&sock_in, &err, 0);
1106                 if (!rc) {
1107                         sprintf(conn->local_ip, "%pI4",
1108                                         &sock_in.sin_addr.s_addr);
1109                         conn->local_port = ntohs(sock_in.sin_port);
1110                 }
1111         }
1112
1113         return 0;
1114 }
1115
1116 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1117 {
1118         struct iscsi_login_req *login_req;
1119         u32 padding = 0, payload_length;
1120
1121         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1122                 return -1;
1123
1124         login_req = (struct iscsi_login_req *)login->req;
1125         payload_length  = ntoh24(login_req->dlength);
1126         padding = ((-payload_length) & 3);
1127
1128         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1129                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1130                 login_req->flags, login_req->itt, login_req->cmdsn,
1131                 login_req->exp_statsn, login_req->cid, payload_length);
1132         /*
1133          * Setup the initial iscsi_login values from the leading
1134          * login request PDU.
1135          */
1136         if (login->first_request) {
1137                 login_req = (struct iscsi_login_req *)login->req;
1138                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1139                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1140                 login->version_min      = login_req->min_version;
1141                 login->version_max      = login_req->max_version;
1142                 memcpy(login->isid, login_req->isid, 6);
1143                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1144                 login->init_task_tag    = login_req->itt;
1145                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1146                 login->cid              = be16_to_cpu(login_req->cid);
1147                 login->tsih             = be16_to_cpu(login_req->tsih);
1148         }
1149
1150         if (iscsi_target_check_login_request(conn, login) < 0)
1151                 return -1;
1152
1153         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1154         if (iscsi_login_rx_data(conn, login->req_buf,
1155                                 payload_length + padding) < 0)
1156                 return -1;
1157
1158         return 0;
1159 }
1160
1161 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1162                         u32 length)
1163 {
1164         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1165                 return -1;
1166
1167         return 0;
1168 }
1169
1170 static int
1171 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1172 {
1173         int rc;
1174
1175         if (!t->owner) {
1176                 conn->conn_transport = t;
1177                 return 0;
1178         }
1179
1180         rc = try_module_get(t->owner);
1181         if (!rc) {
1182                 pr_err("try_module_get() failed for %s\n", t->name);
1183                 return -EINVAL;
1184         }
1185
1186         conn->conn_transport = t;
1187         return 0;
1188 }
1189
1190 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1191                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1192 {
1193         if (!new_sess)
1194                 goto old_sess_out;
1195
1196         pr_err("iSCSI Login negotiation failed.\n");
1197         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1198                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1199         if (!zero_tsih || !conn->sess)
1200                 goto old_sess_out;
1201         if (conn->sess->se_sess)
1202                 transport_free_session(conn->sess->se_sess);
1203         if (conn->sess->session_index != 0) {
1204                 spin_lock_bh(&sess_idr_lock);
1205                 idr_remove(&sess_idr, conn->sess->session_index);
1206                 spin_unlock_bh(&sess_idr_lock);
1207         }
1208         kfree(conn->sess->sess_ops);
1209         kfree(conn->sess);
1210         conn->sess = NULL;
1211
1212 old_sess_out:
1213         iscsi_stop_login_thread_timer(np);
1214         /*
1215          * If login negotiation fails check if the Time2Retain timer
1216          * needs to be restarted.
1217          */
1218         if (!zero_tsih && conn->sess) {
1219                 spin_lock_bh(&conn->sess->conn_lock);
1220                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1221                         struct se_portal_group *se_tpg =
1222                                         &conn->tpg->tpg_se_tpg;
1223
1224                         atomic_set(&conn->sess->session_continuation, 0);
1225                         spin_unlock_bh(&conn->sess->conn_lock);
1226                         spin_lock_bh(&se_tpg->session_lock);
1227                         iscsit_start_time2retain_handler(conn->sess);
1228                         spin_unlock_bh(&se_tpg->session_lock);
1229                 } else
1230                         spin_unlock_bh(&conn->sess->conn_lock);
1231                 iscsit_dec_session_usage_count(conn->sess);
1232         }
1233
1234         if (!IS_ERR(conn->conn_rx_hash.tfm))
1235                 crypto_free_hash(conn->conn_rx_hash.tfm);
1236         if (!IS_ERR(conn->conn_tx_hash.tfm))
1237                 crypto_free_hash(conn->conn_tx_hash.tfm);
1238
1239         free_cpumask_var(conn->conn_cpumask);
1240
1241         kfree(conn->conn_ops);
1242
1243         if (conn->param_list) {
1244                 iscsi_release_param_list(conn->param_list);
1245                 conn->param_list = NULL;
1246         }
1247         iscsi_target_nego_release(conn);
1248
1249         if (conn->sock) {
1250                 sock_release(conn->sock);
1251                 conn->sock = NULL;
1252         }
1253
1254         if (conn->conn_transport->iscsit_wait_conn)
1255                 conn->conn_transport->iscsit_wait_conn(conn);
1256
1257         if (conn->conn_transport->iscsit_free_conn)
1258                 conn->conn_transport->iscsit_free_conn(conn);
1259
1260         iscsit_put_transport(conn->conn_transport);
1261         kfree(conn);
1262 }
1263
1264 static int __iscsi_target_login_thread(struct iscsi_np *np)
1265 {
1266         u8 *buffer, zero_tsih = 0;
1267         int ret = 0, rc;
1268         struct iscsi_conn *conn = NULL;
1269         struct iscsi_login *login;
1270         struct iscsi_portal_group *tpg = NULL;
1271         struct iscsi_login_req *pdu;
1272         struct iscsi_tpg_np *tpg_np;
1273         bool new_sess = false;
1274
1275         flush_signals(current);
1276
1277         spin_lock_bh(&np->np_thread_lock);
1278         if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1279                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1280                 complete(&np->np_restart_comp);
1281         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1282                 spin_unlock_bh(&np->np_thread_lock);
1283                 goto exit;
1284         } else {
1285                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1286         }
1287         spin_unlock_bh(&np->np_thread_lock);
1288
1289         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1290         if (!conn) {
1291                 pr_err("Could not allocate memory for"
1292                         " new connection\n");
1293                 /* Get another socket */
1294                 return 1;
1295         }
1296         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1297         conn->conn_state = TARG_CONN_STATE_FREE;
1298
1299         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1300                 kfree(conn);
1301                 return 1;
1302         }
1303
1304         rc = np->np_transport->iscsit_accept_np(np, conn);
1305         if (rc == -ENOSYS) {
1306                 complete(&np->np_restart_comp);
1307                 iscsit_put_transport(conn->conn_transport);
1308                 kfree(conn);
1309                 conn = NULL;
1310                 goto exit;
1311         } else if (rc < 0) {
1312                 spin_lock_bh(&np->np_thread_lock);
1313                 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1314                         spin_unlock_bh(&np->np_thread_lock);
1315                         complete(&np->np_restart_comp);
1316                         iscsit_put_transport(conn->conn_transport);
1317                         kfree(conn);
1318                         conn = NULL;
1319                         /* Get another socket */
1320                         return 1;
1321                 }
1322                 spin_unlock_bh(&np->np_thread_lock);
1323                 iscsit_put_transport(conn->conn_transport);
1324                 kfree(conn);
1325                 conn = NULL;
1326                 goto out;
1327         }
1328         /*
1329          * Perform the remaining iSCSI connection initialization items..
1330          */
1331         login = iscsi_login_init_conn(conn);
1332         if (!login) {
1333                 goto new_sess_out;
1334         }
1335
1336         iscsi_start_login_thread_timer(np);
1337
1338         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1339         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1340         /*
1341          * This will process the first login request + payload..
1342          */
1343         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1344         if (rc == 1)
1345                 return 1;
1346         else if (rc < 0)
1347                 goto new_sess_out;
1348
1349         buffer = &login->req[0];
1350         pdu = (struct iscsi_login_req *)buffer;
1351         /*
1352          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1353          * when Status-Class != 0.
1354         */
1355         conn->login_itt = pdu->itt;
1356
1357         spin_lock_bh(&np->np_thread_lock);
1358         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1359                 spin_unlock_bh(&np->np_thread_lock);
1360                 pr_err("iSCSI Network Portal on %s:%hu currently not"
1361                         " active.\n", np->np_ip, np->np_port);
1362                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1363                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1364                 goto new_sess_out;
1365         }
1366         spin_unlock_bh(&np->np_thread_lock);
1367
1368         conn->network_transport = np->np_network_transport;
1369
1370         pr_debug("Received iSCSI login request from %s on %s Network"
1371                 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1372                 conn->local_ip, conn->local_port);
1373
1374         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1375         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1376
1377         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1378                         pdu->min_version) < 0)
1379                 goto new_sess_out;
1380
1381         zero_tsih = (pdu->tsih == 0x0000);
1382         if (zero_tsih) {
1383                 /*
1384                  * This is the leading connection of a new session.
1385                  * We wait until after authentication to check for
1386                  * session reinstatement.
1387                  */
1388                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1389                         goto new_sess_out;
1390         } else {
1391                 /*
1392                  * Add a new connection to an existing session.
1393                  * We check for a non-existant session in
1394                  * iscsi_login_non_zero_tsih_s2() below based
1395                  * on ISID/TSIH, but wait until after authentication
1396                  * to check for connection reinstatement, etc.
1397                  */
1398                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1399                         goto new_sess_out;
1400         }
1401         /*
1402          * SessionType: Discovery
1403          *
1404          *      Locates Default Portal
1405          *
1406          * SessionType: Normal
1407          *
1408          *      Locates Target Portal from NP -> Target IQN
1409          */
1410         rc = iscsi_target_locate_portal(np, conn, login);
1411         if (rc < 0) {
1412                 tpg = conn->tpg;
1413                 goto new_sess_out;
1414         }
1415         login->zero_tsih = zero_tsih;
1416
1417         conn->sess->se_sess->sup_prot_ops =
1418                 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1419
1420         tpg = conn->tpg;
1421         if (!tpg) {
1422                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1423                 goto new_sess_out;
1424         }
1425
1426         if (zero_tsih) {
1427                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1428                         goto new_sess_out;
1429         } else {
1430                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1431                         goto old_sess_out;
1432         }
1433
1434         ret = iscsi_target_start_negotiation(login, conn);
1435         if (ret < 0)
1436                 goto new_sess_out;
1437
1438         if (!conn->sess) {
1439                 pr_err("struct iscsi_conn session pointer is NULL!\n");
1440                 goto new_sess_out;
1441         }
1442
1443         iscsi_stop_login_thread_timer(np);
1444
1445         if (signal_pending(current))
1446                 goto new_sess_out;
1447
1448         if (ret == 1) {
1449                 tpg_np = conn->tpg_np;
1450
1451                 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1452                 if (ret < 0)
1453                         goto new_sess_out;
1454
1455                 iscsit_deaccess_np(np, tpg, tpg_np);
1456         }
1457
1458         tpg = NULL;
1459         tpg_np = NULL;
1460         /* Get another socket */
1461         return 1;
1462
1463 new_sess_out:
1464         new_sess = true;
1465 old_sess_out:
1466         tpg_np = conn->tpg_np;
1467         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1468         new_sess = false;
1469
1470         if (tpg) {
1471                 iscsit_deaccess_np(np, tpg, tpg_np);
1472                 tpg = NULL;
1473                 tpg_np = NULL;
1474         }
1475
1476 out:
1477         return 1;
1478
1479 exit:
1480         iscsi_stop_login_thread_timer(np);
1481         spin_lock_bh(&np->np_thread_lock);
1482         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1483         spin_unlock_bh(&np->np_thread_lock);
1484
1485         return 0;
1486 }
1487
1488 int iscsi_target_login_thread(void *arg)
1489 {
1490         struct iscsi_np *np = arg;
1491         int ret;
1492
1493         allow_signal(SIGINT);
1494
1495         while (1) {
1496                 ret = __iscsi_target_login_thread(np);
1497                 /*
1498                  * We break and exit here unless another sock_accept() call
1499                  * is expected.
1500                  */
1501                 if (ret != 1)
1502                         break;
1503         }
1504
1505         return 0;
1506 }