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