drivers/target/iscsi/iscsi_target_login.c

   1 /*******************************************************************************
   2  * This file contains the login functions used by the iSCSI Target driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <crypto/hash.h>
  20 #include <linux/module.h>
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/sched/signal.h>
  24 #include <linux/idr.h>
  25 #include <linux/tcp.h>        /* TCP_NODELAY */
  26 #include <net/ipv6.h>         /* ipv6_addr_v4mapped() */
  27 #include <scsi/iscsi_proto.h>
  28 #include <target/target_core_base.h>
  29 #include <target/target_core_fabric.h>
  30
  31 #include <target/iscsi/iscsi_target_core.h>
  32 #include <target/iscsi/iscsi_target_stat.h>
  33 #include "iscsi_target_device.h"
  34 #include "iscsi_target_nego.h"
  35 #include "iscsi_target_erl0.h"
  36 #include "iscsi_target_erl2.h"
  37 #include "iscsi_target_login.h"
  38 #include "iscsi_target_tpg.h"
  39 #include "iscsi_target_util.h"
  40 #include "iscsi_target.h"
  41 #include "iscsi_target_parameters.h"
  42
  43 #include <target/iscsi/iscsi_transport.h>
  44
  45 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  46 {
  47         struct iscsi_login *login;
  48
  49         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  50         if (!login) {
  51                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  52                 return NULL;
  53         }
  54         conn->login = login;
  55         login->conn = conn;
  56         login->first_request = 1;
  57
  58         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  59         if (!login->req_buf) {
  60                 pr_err("Unable to allocate memory for response buffer.\n");
  61                 goto out_login;
  62         }
  63
  64         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  65         if (!login->rsp_buf) {
  66                 pr_err("Unable to allocate memory for request buffer.\n");
  67                 goto out_req_buf;
  68         }
  69
  70         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
  71         if (!conn->conn_ops) {
  72                 pr_err("Unable to allocate memory for"
  73                         " struct iscsi_conn_ops.\n");
  74                 goto out_rsp_buf;
  75         }
  76
  77         init_waitqueue_head(&conn->queues_wq);
  78         INIT_LIST_HEAD(&conn->conn_list);
  79         INIT_LIST_HEAD(&conn->conn_cmd_list);
  80         INIT_LIST_HEAD(&conn->immed_queue_list);
  81         INIT_LIST_HEAD(&conn->response_queue_list);
  82         init_completion(&conn->conn_post_wait_comp);
  83         init_completion(&conn->conn_wait_comp);
  84         init_completion(&conn->conn_wait_rcfr_comp);
  85         init_completion(&conn->conn_waiting_on_uc_comp);
  86         init_completion(&conn->conn_logout_comp);
  87         init_completion(&conn->rx_half_close_comp);
  88         init_completion(&conn->tx_half_close_comp);
  89         init_completion(&conn->rx_login_comp);
  90         spin_lock_init(&conn->cmd_lock);
  91         spin_lock_init(&conn->conn_usage_lock);
  92         spin_lock_init(&conn->immed_queue_lock);
  93         spin_lock_init(&conn->nopin_timer_lock);
  94         spin_lock_init(&conn->response_queue_lock);
  95         spin_lock_init(&conn->state_lock);
  96
  97         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
  98                 pr_err("Unable to allocate conn->conn_cpumask\n");
  99                 goto out_conn_ops;
 100         }
 101         conn->conn_login = login;
 102
 103         return login;
 104
 105 out_conn_ops:
 106         kfree(conn->conn_ops);
 107 out_rsp_buf:
 108         kfree(login->rsp_buf);
 109 out_req_buf:
 110         kfree(login->req_buf);
 111 out_login:
 112         kfree(login);
 113         return NULL;
 114 }
 115
 116 /*
 117  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
 118  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
 119  */
 120 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
 121 {
 122         struct crypto_ahash *tfm;
 123
 124         /*
 125          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
 126          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
 127          * to software 1x8 byte slicing from crc32c.ko
 128          */
 129         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
 130         if (IS_ERR(tfm)) {
 131                 pr_err("crypto_alloc_ahash() failed\n");
 132                 return -ENOMEM;
 133         }
 134
 135         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 136         if (!conn->conn_rx_hash) {
 137                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
 138                 crypto_free_ahash(tfm);
 139                 return -ENOMEM;
 140         }
 141         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
 142
 143         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 144         if (!conn->conn_tx_hash) {
 145                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 146                 ahash_request_free(conn->conn_rx_hash);
 147                 conn->conn_rx_hash = NULL;
 148                 crypto_free_ahash(tfm);
 149                 return -ENOMEM;
 150         }
 151         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 152
 153         return 0;
 154 }
 155
 156 static int iscsi_login_check_initiator_version(
 157         struct iscsi_conn *conn,
 158         u8 version_max,
 159         u8 version_min)
 160 {
 161         if ((version_max != 0x00) || (version_min != 0x00)) {
 162                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 163                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 164                         version_min, version_max);
 165                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 166                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 167                 return -1;
 168         }
 169
 170         return 0;
 171 }
 172
 173 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 174 {
 175         int sessiontype;
 176         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 177         struct iscsi_portal_group *tpg = conn->tpg;
 178         struct iscsi_session *sess = NULL, *sess_p = NULL;
 179         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 180         struct se_session *se_sess, *se_sess_tmp;
 181
 182         initiatorname_param = iscsi_find_param_from_key(
 183                         INITIATORNAME, conn->param_list);
 184         sessiontype_param = iscsi_find_param_from_key(
 185                         SESSIONTYPE, conn->param_list);
 186         if (!initiatorname_param || !sessiontype_param) {
 187                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 188                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 189                 return -1;
 190         }
 191
 192         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 193
 194         spin_lock_bh(&se_tpg->session_lock);
 195         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 196                         sess_list) {
 197
 198                 sess_p = se_sess->fabric_sess_ptr;
 199                 spin_lock(&sess_p->conn_lock);
 200                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 201                     atomic_read(&sess_p->session_logout) ||
 202                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 203                         spin_unlock(&sess_p->conn_lock);
 204                         continue;
 205                 }
 206                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 207                    (!strcmp(sess_p->sess_ops->InitiatorName,
 208                             initiatorname_param->value) &&
 209                    (sess_p->sess_ops->SessionType == sessiontype))) {
 210                         atomic_set(&sess_p->session_reinstatement, 1);
 211                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 212                         spin_unlock(&sess_p->conn_lock);
 213                         iscsit_inc_session_usage_count(sess_p);
 214                         iscsit_stop_time2retain_timer(sess_p);
 215                         sess = sess_p;
 216                         break;
 217                 }
 218                 spin_unlock(&sess_p->conn_lock);
 219         }
 220         spin_unlock_bh(&se_tpg->session_lock);
 221         /*
 222          * If the Time2Retain handler has expired, the session is already gone.
 223          */
 224         if (!sess)
 225                 return 0;
 226
 227         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 228                 " performing session reinstatement.\n", (sessiontype) ?
 229                 "Discovery" : "Normal", sess->sid,
 230                 sess->sess_ops->InitiatorName);
 231
 232         spin_lock_bh(&sess->conn_lock);
 233         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 234                 spin_unlock_bh(&sess->conn_lock);
 235                 iscsit_dec_session_usage_count(sess);
 236                 iscsit_close_session(sess);
 237                 return 0;
 238         }
 239         spin_unlock_bh(&sess->conn_lock);
 240
 241         iscsit_stop_session(sess, 1, 1);
 242         iscsit_dec_session_usage_count(sess);
 243
 244         iscsit_close_session(sess);
 245         return 0;
 246 }
 247
 248 static int iscsi_login_set_conn_values(
 249         struct iscsi_session *sess,
 250         struct iscsi_conn *conn,
 251         __be16 cid)
 252 {
 253         int ret;
 254         conn->sess              = sess;
 255         conn->cid               = be16_to_cpu(cid);
 256         /*
 257          * Generate a random Status sequence number (statsn) for the new
 258          * iSCSI connection.
 259          */
 260         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 261         if (unlikely(ret))
 262                 return ret;
 263
 264         mutex_lock(&auth_id_lock);
 265         conn->auth_id           = iscsit_global->auth_id++;
 266         mutex_unlock(&auth_id_lock);
 267         return 0;
 268 }
 269
 270 __printf(2, 3) int iscsi_change_param_sprintf(
 271         struct iscsi_conn *conn,
 272         const char *fmt, ...)
 273 {
 274         va_list args;
 275         unsigned char buf[64];
 276
 277         memset(buf, 0, sizeof buf);
 278
 279         va_start(args, fmt);
 280         vsnprintf(buf, sizeof buf, fmt, args);
 281         va_end(args);
 282
 283         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 284                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 285                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 286                 return -1;
 287         }
 288
 289         return 0;
 290 }
 291 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 292
 293 /*
 294  *      This is the leading connection of a new session,
 295  *      or session reinstatement.
 296  */
 297 static int iscsi_login_zero_tsih_s1(
 298         struct iscsi_conn *conn,
 299         unsigned char *buf)
 300 {
 301         struct iscsi_session *sess = NULL;
 302         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 303         int ret;
 304
 305         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 306         if (!sess) {
 307                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 308                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 309                 pr_err("Could not allocate memory for session\n");
 310                 return -ENOMEM;
 311         }
 312
 313         ret = iscsi_login_set_conn_values(sess, conn, pdu->cid);
 314         if (unlikely(ret)) {
 315                 kfree(sess);
 316                 return ret;
 317         }
 318         sess->init_task_tag     = pdu->itt;
 319         memcpy(&sess->isid, pdu->isid, 6);
 320         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 321         INIT_LIST_HEAD(&sess->sess_conn_list);
 322         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 323         INIT_LIST_HEAD(&sess->cr_active_list);
 324         INIT_LIST_HEAD(&sess->cr_inactive_list);
 325         init_completion(&sess->async_msg_comp);
 326         init_completion(&sess->reinstatement_comp);
 327         init_completion(&sess->session_wait_comp);
 328         init_completion(&sess->session_waiting_on_uc_comp);
 329         mutex_init(&sess->cmdsn_mutex);
 330         spin_lock_init(&sess->conn_lock);
 331         spin_lock_init(&sess->cr_a_lock);
 332         spin_lock_init(&sess->cr_i_lock);
 333         spin_lock_init(&sess->session_usage_lock);
 334         spin_lock_init(&sess->ttt_lock);
 335
 336         timer_setup(&sess->time2retain_timer,
 337                     iscsit_handle_time2retain_timeout, 0);
 338
 339         ret = ida_alloc(&sess_ida, GFP_KERNEL);
 340         if (ret < 0) {
 341                 pr_err("Session ID allocation failed %d\n", ret);
 342                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 343                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 344                 goto free_sess;
 345         }
 346
 347         sess->session_index = ret;
 348         sess->creation_time = get_jiffies_64();
 349         /*
 350          * The FFP CmdSN window values will be allocated from the TPG's
 351          * Initiator Node's ACL once the login has been successfully completed.
 352          */
 353         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 354
 355         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 356         if (!sess->sess_ops) {
 357                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 358                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 359                 pr_err("Unable to allocate memory for"
 360                                 " struct iscsi_sess_ops.\n");
 361                 goto free_id;
 362         }
 363
 364         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 365         if (IS_ERR(sess->se_sess)) {
 366                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 367                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 368                 goto free_ops;
 369         }
 370
 371         return 0;
 372
 373 free_ops:
 374         kfree(sess->sess_ops);
 375 free_id:
 376         ida_free(&sess_ida, sess->session_index);
 377 free_sess:
 378         kfree(sess);
 379         conn->sess = NULL;
 380         return -ENOMEM;
 381 }
 382
 383 static int iscsi_login_zero_tsih_s2(
 384         struct iscsi_conn *conn)
 385 {
 386         struct iscsi_node_attrib *na;
 387         struct iscsi_session *sess = conn->sess;
 388         bool iser = false;
 389
 390         sess->tpg = conn->tpg;
 391
 392         /*
 393          * Assign a new TPG Session Handle.  Note this is protected with
 394          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 395          */
 396         sess->tsih = ++sess->tpg->ntsih;
 397         if (!sess->tsih)
 398                 sess->tsih = ++sess->tpg->ntsih;
 399
 400         /*
 401          * Create the default params from user defined values..
 402          */
 403         if (iscsi_copy_param_list(&conn->param_list,
 404                                 conn->tpg->param_list, 1) < 0) {
 405                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 406                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 407                 return -1;
 408         }
 409
 410         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 411                 iser = true;
 412
 413         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 414
 415         if (sess->sess_ops->SessionType)
 416                 return iscsi_set_keys_irrelevant_for_discovery(
 417                                 conn->param_list);
 418
 419         na = iscsit_tpg_get_node_attrib(sess);
 420
 421         /*
 422          * Need to send TargetPortalGroupTag back in first login response
 423          * on any iSCSI connection where the Initiator provides TargetName.
 424          * See 5.3.1.  Login Phase Start
 425          *
 426          * In our case, we have already located the struct iscsi_tiqn at this point.
 427          */
 428         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 429                 return -1;
 430
 431         /*
 432          * Workaround for Initiators that have broken connection recovery logic.
 433          *
 434          * "We would really like to get rid of this." Linux-iSCSI.org team
 435          */
 436         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 437                 return -1;
 438
 439         /*
 440          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 441          */
 442         if (iser) {
 443                 struct iscsi_param *param;
 444                 unsigned long mrdsl, off;
 445                 int rc;
 446
 447                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 448                         return -1;
 449
 450                 /*
 451                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 452                  * Immediate Data + Unsolicited Data-OUT if necessary..
 453                  */
 454                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 455                                                   conn->param_list);
 456                 if (!param) {
 457                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 458                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 459                         return -1;
 460                 }
 461                 rc = kstrtoul(param->value, 0, &mrdsl);
 462                 if (rc < 0) {
 463                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 464                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 465                         return -1;
 466                 }
 467                 off = mrdsl % PAGE_SIZE;
 468                 if (!off)
 469                         goto check_prot;
 470
 471                 if (mrdsl < PAGE_SIZE)
 472                         mrdsl = PAGE_SIZE;
 473                 else
 474                         mrdsl -= off;
 475
 476                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 477                         " to PAGE_SIZE\n", mrdsl);
 478
 479                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 480                         return -1;
 481                 /*
 482                  * ISER currently requires that ImmediateData + Unsolicited
 483                  * Data be disabled when protection / signature MRs are enabled.
 484                  */
 485 check_prot:
 486                 if (sess->se_sess->sup_prot_ops &
 487                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 488                     TARGET_PROT_DOUT_INSERT)) {
 489
 490                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 491                                 return -1;
 492
 493                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 494                                 return -1;
 495
 496                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 497                                  " T10-PI enabled ISER session\n");
 498                 }
 499         }
 500
 501         return 0;
 502 }
 503
 504 static int iscsi_login_non_zero_tsih_s1(
 505         struct iscsi_conn *conn,
 506         unsigned char *buf)
 507 {
 508         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 509
 510         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 511 }
 512
 513 /*
 514  *      Add a new connection to an existing session.
 515  */
 516 static int iscsi_login_non_zero_tsih_s2(
 517         struct iscsi_conn *conn,
 518         unsigned char *buf)
 519 {
 520         struct iscsi_portal_group *tpg = conn->tpg;
 521         struct iscsi_session *sess = NULL, *sess_p = NULL;
 522         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 523         struct se_session *se_sess, *se_sess_tmp;
 524         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 525         bool iser = false;
 526
 527         spin_lock_bh(&se_tpg->session_lock);
 528         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 529                         sess_list) {
 530
 531                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 532                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 533                     atomic_read(&sess_p->session_logout) ||
 534                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 535                         continue;
 536                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 537                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 538                         iscsit_inc_session_usage_count(sess_p);
 539                         iscsit_stop_time2retain_timer(sess_p);
 540                         sess = sess_p;
 541                         break;
 542                 }
 543         }
 544         spin_unlock_bh(&se_tpg->session_lock);
 545
 546         /*
 547          * If the Time2Retain handler has expired, the session is already gone.
 548          */
 549         if (!sess) {
 550                 pr_err("Initiator attempting to add a connection to"
 551                         " a non-existent session, rejecting iSCSI Login.\n");
 552                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 553                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 554                 return -1;
 555         }
 556
 557         /*
 558          * Stop the Time2Retain timer if this is a failed session, we restart
 559          * the timer if the login is not successful.
 560          */
 561         spin_lock_bh(&sess->conn_lock);
 562         if (sess->session_state == TARG_SESS_STATE_FAILED)
 563                 atomic_set(&sess->session_continuation, 1);
 564         spin_unlock_bh(&sess->conn_lock);
 565
 566         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 567             iscsi_copy_param_list(&conn->param_list,
 568                         conn->tpg->param_list, 0) < 0) {
 569                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 570                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 571                 return -1;
 572         }
 573
 574         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 575                 iser = true;
 576
 577         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 578         /*
 579          * Need to send TargetPortalGroupTag back in first login response
 580          * on any iSCSI connection where the Initiator provides TargetName.
 581          * See 5.3.1.  Login Phase Start
 582          *
 583          * In our case, we have already located the struct iscsi_tiqn at this point.
 584          */
 585         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 586                 return -1;
 587
 588         return 0;
 589 }
 590
 591 int iscsi_login_post_auth_non_zero_tsih(
 592         struct iscsi_conn *conn,
 593         u16 cid,
 594         u32 exp_statsn)
 595 {
 596         struct iscsi_conn *conn_ptr = NULL;
 597         struct iscsi_conn_recovery *cr = NULL;
 598         struct iscsi_session *sess = conn->sess;
 599
 600         /*
 601          * By following item 5 in the login table,  if we have found
 602          * an existing ISID and a valid/existing TSIH and an existing
 603          * CID we do connection reinstatement.  Currently we dont not
 604          * support it so we send back an non-zero status class to the
 605          * initiator and release the new connection.
 606          */
 607         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 608         if (conn_ptr) {
 609                 pr_err("Connection exists with CID %hu for %s,"
 610                         " performing connection reinstatement.\n",
 611                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 612
 613                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 614                 iscsit_dec_conn_usage_count(conn_ptr);
 615         }
 616
 617         /*
 618          * Check for any connection recovery entires containing CID.
 619          * We use the original ExpStatSN sent in the first login request
 620          * to acknowledge commands for the failed connection.
 621          *
 622          * Also note that an explict logout may have already been sent,
 623          * but the response may not be sent due to additional connection
 624          * loss.
 625          */
 626         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 627                 cr = iscsit_get_inactive_connection_recovery_entry(
 628                                 sess, cid);
 629                 if (cr) {
 630                         pr_debug("Performing implicit logout"
 631                                 " for connection recovery on CID: %hu\n",
 632                                         conn->cid);
 633                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 634                 }
 635         }
 636
 637         /*
 638          * Else we follow item 4 from the login table in that we have
 639          * found an existing ISID and a valid/existing TSIH and a new
 640          * CID we go ahead and continue to add a new connection to the
 641          * session.
 642          */
 643         pr_debug("Adding CID %hu to existing session for %s.\n",
 644                         cid, sess->sess_ops->InitiatorName);
 645
 646         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 647                 pr_err("Adding additional connection to this session"
 648                         " would exceed MaxConnections %d, login failed.\n",
 649                                 sess->sess_ops->MaxConnections);
 650                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 651                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 652                 return -1;
 653         }
 654
 655         return 0;
 656 }
 657
 658 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 659 {
 660         struct iscsi_session *sess = conn->sess;
 661         /*
 662          * FIXME: Unsolicited NopIN support for ISER
 663          */
 664         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 665                 return;
 666
 667         if (!sess->sess_ops->SessionType)
 668                 iscsit_start_nopin_timer(conn);
 669 }
 670
 671 int iscsit_start_kthreads(struct iscsi_conn *conn)
 672 {
 673         int ret = 0;
 674
 675         spin_lock(&iscsit_global->ts_bitmap_lock);
 676         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 677                                         ISCSIT_BITMAP_BITS, get_order(1));
 678         spin_unlock(&iscsit_global->ts_bitmap_lock);
 679
 680         if (conn->bitmap_id < 0) {
 681                 pr_err("bitmap_find_free_region() failed for"
 682                        " iscsit_start_kthreads()\n");
 683                 return -ENOMEM;
 684         }
 685
 686         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 687                                       "%s", ISCSI_TX_THREAD_NAME);
 688         if (IS_ERR(conn->tx_thread)) {
 689                 pr_err("Unable to start iscsi_target_tx_thread\n");
 690                 ret = PTR_ERR(conn->tx_thread);
 691                 goto out_bitmap;
 692         }
 693         conn->tx_thread_active = true;
 694
 695         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 696                                       "%s", ISCSI_RX_THREAD_NAME);
 697         if (IS_ERR(conn->rx_thread)) {
 698                 pr_err("Unable to start iscsi_target_rx_thread\n");
 699                 ret = PTR_ERR(conn->rx_thread);
 700                 goto out_tx;
 701         }
 702         conn->rx_thread_active = true;
 703
 704         return 0;
 705 out_tx:
 706         send_sig(SIGINT, conn->tx_thread, 1);
 707         kthread_stop(conn->tx_thread);
 708         conn->tx_thread_active = false;
 709 out_bitmap:
 710         spin_lock(&iscsit_global->ts_bitmap_lock);
 711         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 712                               get_order(1));
 713         spin_unlock(&iscsit_global->ts_bitmap_lock);
 714         return ret;
 715 }
 716
 717 void iscsi_post_login_handler(
 718         struct iscsi_np *np,
 719         struct iscsi_conn *conn,
 720         u8 zero_tsih)
 721 {
 722         int stop_timer = 0;
 723         struct iscsi_session *sess = conn->sess;
 724         struct se_session *se_sess = sess->se_sess;
 725         struct iscsi_portal_group *tpg = sess->tpg;
 726         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 727
 728         iscsit_inc_conn_usage_count(conn);
 729
 730         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 731                         ISCSI_LOGIN_STATUS_ACCEPT);
 732
 733         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 734         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 735
 736         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 737         /*
 738          * SCSI Initiator -> SCSI Target Port Mapping
 739          */
 740         if (!zero_tsih) {
 741                 iscsi_set_session_parameters(sess->sess_ops,
 742                                 conn->param_list, 0);
 743                 iscsi_release_param_list(conn->param_list);
 744                 conn->param_list = NULL;
 745
 746                 spin_lock_bh(&sess->conn_lock);
 747                 atomic_set(&sess->session_continuation, 0);
 748                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 749                         pr_debug("Moving to"
 750                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 751                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 752                         stop_timer = 1;
 753                 }
 754
 755                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 756                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 757                         &conn->local_sockaddr, tpg->tpgt);
 758
 759                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 760                 atomic_inc(&sess->nconn);
 761                 pr_debug("Incremented iSCSI Connection count to %hu"
 762                         " from node: %s\n", atomic_read(&sess->nconn),
 763                         sess->sess_ops->InitiatorName);
 764                 spin_unlock_bh(&sess->conn_lock);
 765
 766                 iscsi_post_login_start_timers(conn);
 767                 /*
 768                  * Determine CPU mask to ensure connection's RX and TX kthreads
 769                  * are scheduled on the same CPU.
 770                  */
 771                 iscsit_thread_get_cpumask(conn);
 772                 conn->conn_rx_reset_cpumask = 1;
 773                 conn->conn_tx_reset_cpumask = 1;
 774                 /*
 775                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 776                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 777                  */
 778                 complete(&conn->rx_login_comp);
 779                 iscsit_dec_conn_usage_count(conn);
 780
 781                 if (stop_timer) {
 782                         spin_lock_bh(&se_tpg->session_lock);
 783                         iscsit_stop_time2retain_timer(sess);
 784                         spin_unlock_bh(&se_tpg->session_lock);
 785                 }
 786                 iscsit_dec_session_usage_count(sess);
 787                 return;
 788         }
 789
 790         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 791         iscsi_release_param_list(conn->param_list);
 792         conn->param_list = NULL;
 793
 794         iscsit_determine_maxcmdsn(sess);
 795
 796         spin_lock_bh(&se_tpg->session_lock);
 797         __transport_register_session(&sess->tpg->tpg_se_tpg,
 798                         se_sess->se_node_acl, se_sess, sess);
 799         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 800         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 801
 802         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 803                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 804                 tpg->tpgt);
 805
 806         spin_lock_bh(&sess->conn_lock);
 807         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 808         atomic_inc(&sess->nconn);
 809         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 810                 " %s\n", atomic_read(&sess->nconn),
 811                 sess->sess_ops->InitiatorName);
 812         spin_unlock_bh(&sess->conn_lock);
 813
 814         sess->sid = tpg->sid++;
 815         if (!sess->sid)
 816                 sess->sid = tpg->sid++;
 817         pr_debug("Established iSCSI session from node: %s\n",
 818                         sess->sess_ops->InitiatorName);
 819
 820         tpg->nsessions++;
 821         if (tpg->tpg_tiqn)
 822                 tpg->tpg_tiqn->tiqn_nsessions++;
 823
 824         pr_debug("Incremented number of active iSCSI sessions to %u on"
 825                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 826         spin_unlock_bh(&se_tpg->session_lock);
 827
 828         iscsi_post_login_start_timers(conn);
 829         /*
 830          * Determine CPU mask to ensure connection's RX and TX kthreads
 831          * are scheduled on the same CPU.
 832          */
 833         iscsit_thread_get_cpumask(conn);
 834         conn->conn_rx_reset_cpumask = 1;
 835         conn->conn_tx_reset_cpumask = 1;
 836         /*
 837          * Wakeup the sleeping iscsi_target_rx_thread() now that
 838          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 839          */
 840         complete(&conn->rx_login_comp);
 841         iscsit_dec_conn_usage_count(conn);
 842 }
 843
 844 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 845 {
 846         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 847
 848         spin_lock_bh(&np->np_thread_lock);
 849         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 850                         &np->np_sockaddr);
 851
 852         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 853                 spin_unlock_bh(&np->np_thread_lock);
 854                 return;
 855         }
 856
 857         if (np->np_thread)
 858                 send_sig(SIGINT, np->np_thread, 1);
 859
 860         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 861         spin_unlock_bh(&np->np_thread_lock);
 862 }
 863
 864 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 865 {
 866         /*
 867          * This used the TA_LOGIN_TIMEOUT constant because at this
 868          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 869          */
 870         spin_lock_bh(&np->np_thread_lock);
 871         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 872         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 873         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 874
 875         pr_debug("Added timeout timer to iSCSI login request for"
 876                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 877         spin_unlock_bh(&np->np_thread_lock);
 878 }
 879
 880 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 881 {
 882         spin_lock_bh(&np->np_thread_lock);
 883         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 884                 spin_unlock_bh(&np->np_thread_lock);
 885                 return;
 886         }
 887         np->np_login_timer_flags |= ISCSI_TF_STOP;
 888         spin_unlock_bh(&np->np_thread_lock);
 889
 890         del_timer_sync(&np->np_login_timer);
 891
 892         spin_lock_bh(&np->np_thread_lock);
 893         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 894         spin_unlock_bh(&np->np_thread_lock);
 895 }
 896
 897 int iscsit_setup_np(
 898         struct iscsi_np *np,
 899         struct sockaddr_storage *sockaddr)
 900 {
 901         struct socket *sock = NULL;
 902         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 903
 904         switch (np->np_network_transport) {
 905         case ISCSI_TCP:
 906                 np->np_ip_proto = IPPROTO_TCP;
 907                 np->np_sock_type = SOCK_STREAM;
 908                 break;
 909         case ISCSI_SCTP_TCP:
 910                 np->np_ip_proto = IPPROTO_SCTP;
 911                 np->np_sock_type = SOCK_STREAM;
 912                 break;
 913         case ISCSI_SCTP_UDP:
 914                 np->np_ip_proto = IPPROTO_SCTP;
 915                 np->np_sock_type = SOCK_SEQPACKET;
 916                 break;
 917         default:
 918                 pr_err("Unsupported network_transport: %d\n",
 919                                 np->np_network_transport);
 920                 return -EINVAL;
 921         }
 922
 923         np->np_ip_proto = IPPROTO_TCP;
 924         np->np_sock_type = SOCK_STREAM;
 925
 926         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 927                         np->np_ip_proto, &sock);
 928         if (ret < 0) {
 929                 pr_err("sock_create() failed.\n");
 930                 return ret;
 931         }
 932         np->np_socket = sock;
 933         /*
 934          * Setup the np->np_sockaddr from the passed sockaddr setup
 935          * in iscsi_target_configfs.c code..
 936          */
 937         memcpy(&np->np_sockaddr, sockaddr,
 938                         sizeof(struct sockaddr_storage));
 939
 940         if (sockaddr->ss_family == AF_INET6)
 941                 len = sizeof(struct sockaddr_in6);
 942         else
 943                 len = sizeof(struct sockaddr_in);
 944         /*
 945          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 946          */
 947         /* FIXME: Someone please explain why this is endian-safe */
 948         opt = 1;
 949         if (np->np_network_transport == ISCSI_TCP) {
 950                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 951                                 (char *)&opt, sizeof(opt));
 952                 if (ret < 0) {
 953                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 954                                 " failed: %d\n", ret);
 955                         goto fail;
 956                 }
 957         }
 958
 959         /* FIXME: Someone please explain why this is endian-safe */
 960         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 961                         (char *)&opt, sizeof(opt));
 962         if (ret < 0) {
 963                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 964                         " failed\n");
 965                 goto fail;
 966         }
 967
 968         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 969                         (char *)&opt, sizeof(opt));
 970         if (ret < 0) {
 971                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 972                         " failed\n");
 973                 goto fail;
 974         }
 975
 976         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 977         if (ret < 0) {
 978                 pr_err("kernel_bind() failed: %d\n", ret);
 979                 goto fail;
 980         }
 981
 982         ret = kernel_listen(sock, backlog);
 983         if (ret != 0) {
 984                 pr_err("kernel_listen() failed: %d\n", ret);
 985                 goto fail;
 986         }
 987
 988         return 0;
 989 fail:
 990         np->np_socket = NULL;
 991         sock_release(sock);
 992         return ret;
 993 }
 994
 995 int iscsi_target_setup_login_socket(
 996         struct iscsi_np *np,
 997         struct sockaddr_storage *sockaddr)
 998 {
 999         struct iscsit_transport *t;
1000         int rc;
1001
1002         t = iscsit_get_transport(np->np_network_transport);
1003         if (!t)
1004                 return -EINVAL;
1005
1006         rc = t->iscsit_setup_np(np, sockaddr);
1007         if (rc < 0) {
1008                 iscsit_put_transport(t);
1009                 return rc;
1010         }
1011
1012         np->np_transport = t;
1013         np->enabled = true;
1014         return 0;
1015 }
1016
1017 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1018 {
1019         struct socket *new_sock, *sock = np->np_socket;
1020         struct sockaddr_in sock_in;
1021         struct sockaddr_in6 sock_in6;
1022         int rc;
1023
1024         rc = kernel_accept(sock, &new_sock, 0);
1025         if (rc < 0)
1026                 return rc;
1027
1028         conn->sock = new_sock;
1029         conn->login_family = np->np_sockaddr.ss_family;
1030
1031         if (np->np_sockaddr.ss_family == AF_INET6) {
1032                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1033
1034                 rc = conn->sock->ops->getname(conn->sock,
1035                                 (struct sockaddr *)&sock_in6, 1);
1036                 if (rc >= 0) {
1037                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1038                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1039                         } else {
1040                                 /* Pretend to be an ipv4 socket */
1041                                 sock_in.sin_family = AF_INET;
1042                                 sock_in.sin_port = sock_in6.sin6_port;
1043                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1044                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1045                         }
1046                 }
1047
1048                 rc = conn->sock->ops->getname(conn->sock,
1049                                 (struct sockaddr *)&sock_in6, 0);
1050                 if (rc >= 0) {
1051                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1052                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1053                         } else {
1054                                 /* Pretend to be an ipv4 socket */
1055                                 sock_in.sin_family = AF_INET;
1056                                 sock_in.sin_port = sock_in6.sin6_port;
1057                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1058                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1059                         }
1060                 }
1061         } else {
1062                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1063
1064                 rc = conn->sock->ops->getname(conn->sock,
1065                                 (struct sockaddr *)&sock_in, 1);
1066                 if (rc >= 0)
1067                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1068
1069                 rc = conn->sock->ops->getname(conn->sock,
1070                                 (struct sockaddr *)&sock_in, 0);
1071                 if (rc >= 0)
1072                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1073         }
1074
1075         return 0;
1076 }
1077
1078 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1079 {
1080         struct iscsi_login_req *login_req;
1081         u32 padding = 0, payload_length;
1082
1083         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1084                 return -1;
1085
1086         login_req = (struct iscsi_login_req *)login->req;
1087         payload_length  = ntoh24(login_req->dlength);
1088         padding = ((-payload_length) & 3);
1089
1090         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1091                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1092                 login_req->flags, login_req->itt, login_req->cmdsn,
1093                 login_req->exp_statsn, login_req->cid, payload_length);
1094         /*
1095          * Setup the initial iscsi_login values from the leading
1096          * login request PDU.
1097          */
1098         if (login->first_request) {
1099                 login_req = (struct iscsi_login_req *)login->req;
1100                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1101                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1102                 login->version_min      = login_req->min_version;
1103                 login->version_max      = login_req->max_version;
1104                 memcpy(login->isid, login_req->isid, 6);
1105                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1106                 login->init_task_tag    = login_req->itt;
1107                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1108                 login->cid              = be16_to_cpu(login_req->cid);
1109                 login->tsih             = be16_to_cpu(login_req->tsih);
1110         }
1111
1112         if (iscsi_target_check_login_request(conn, login) < 0)
1113                 return -1;
1114
1115         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1116         if (iscsi_login_rx_data(conn, login->req_buf,
1117                                 payload_length + padding) < 0)
1118                 return -1;
1119
1120         return 0;
1121 }
1122
1123 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1124                         u32 length)
1125 {
1126         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1127                 return -1;
1128
1129         return 0;
1130 }
1131
1132 static int
1133 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1134 {
1135         int rc;
1136
1137         if (!t->owner) {
1138                 conn->conn_transport = t;
1139                 return 0;
1140         }
1141
1142         rc = try_module_get(t->owner);
1143         if (!rc) {
1144                 pr_err("try_module_get() failed for %s\n", t->name);
1145                 return -EINVAL;
1146         }
1147
1148         conn->conn_transport = t;
1149         return 0;
1150 }
1151
1152 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1153                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1154 {
1155         if (!new_sess)
1156                 goto old_sess_out;
1157
1158         pr_err("iSCSI Login negotiation failed.\n");
1159         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1160                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1161         if (!zero_tsih || !conn->sess)
1162                 goto old_sess_out;
1163
1164         transport_free_session(conn->sess->se_sess);
1165         ida_free(&sess_ida, conn->sess->session_index);
1166         kfree(conn->sess->sess_ops);
1167         kfree(conn->sess);
1168         conn->sess = NULL;
1169
1170 old_sess_out:
1171         iscsi_stop_login_thread_timer(np);
1172         /*
1173          * If login negotiation fails check if the Time2Retain timer
1174          * needs to be restarted.
1175          */
1176         if (!zero_tsih && conn->sess) {
1177                 spin_lock_bh(&conn->sess->conn_lock);
1178                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1179                         struct se_portal_group *se_tpg =
1180                                         &conn->tpg->tpg_se_tpg;
1181
1182                         atomic_set(&conn->sess->session_continuation, 0);
1183                         spin_unlock_bh(&conn->sess->conn_lock);
1184                         spin_lock_bh(&se_tpg->session_lock);
1185                         iscsit_start_time2retain_handler(conn->sess);
1186                         spin_unlock_bh(&se_tpg->session_lock);
1187                 } else
1188                         spin_unlock_bh(&conn->sess->conn_lock);
1189                 iscsit_dec_session_usage_count(conn->sess);
1190         }
1191
1192         ahash_request_free(conn->conn_tx_hash);
1193         if (conn->conn_rx_hash) {
1194                 struct crypto_ahash *tfm;
1195
1196                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1197                 ahash_request_free(conn->conn_rx_hash);
1198                 crypto_free_ahash(tfm);
1199         }
1200
1201         free_cpumask_var(conn->conn_cpumask);
1202
1203         kfree(conn->conn_ops);
1204
1205         if (conn->param_list) {
1206                 iscsi_release_param_list(conn->param_list);
1207                 conn->param_list = NULL;
1208         }
1209         iscsi_target_nego_release(conn);
1210
1211         if (conn->sock) {
1212                 sock_release(conn->sock);
1213                 conn->sock = NULL;
1214         }
1215
1216         if (conn->conn_transport->iscsit_wait_conn)
1217                 conn->conn_transport->iscsit_wait_conn(conn);
1218
1219         if (conn->conn_transport->iscsit_free_conn)
1220                 conn->conn_transport->iscsit_free_conn(conn);
1221
1222         iscsit_put_transport(conn->conn_transport);
1223         kfree(conn);
1224 }
1225
1226 static int __iscsi_target_login_thread(struct iscsi_np *np)
1227 {
1228         u8 *buffer, zero_tsih = 0;
1229         int ret = 0, rc;
1230         struct iscsi_conn *conn = NULL;
1231         struct iscsi_login *login;
1232         struct iscsi_portal_group *tpg = NULL;
1233         struct iscsi_login_req *pdu;
1234         struct iscsi_tpg_np *tpg_np;
1235         bool new_sess = false;
1236
1237         flush_signals(current);
1238
1239         spin_lock_bh(&np->np_thread_lock);
1240         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1241                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1242                 spin_unlock_bh(&np->np_thread_lock);
1243                 complete(&np->np_restart_comp);
1244                 return 1;
1245         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1246                 spin_unlock_bh(&np->np_thread_lock);
1247                 goto exit;
1248         } else {
1249                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1250         }
1251         spin_unlock_bh(&np->np_thread_lock);
1252
1253         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1254         if (!conn) {
1255                 pr_err("Could not allocate memory for"
1256                         " new connection\n");
1257                 /* Get another socket */
1258                 return 1;
1259         }
1260         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1261         conn->conn_state = TARG_CONN_STATE_FREE;
1262
1263         timer_setup(&conn->nopin_response_timer,
1264                     iscsit_handle_nopin_response_timeout, 0);
1265         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1266
1267         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1268                 kfree(conn);
1269                 return 1;
1270         }
1271
1272         rc = np->np_transport->iscsit_accept_np(np, conn);
1273         if (rc == -ENOSYS) {
1274                 complete(&np->np_restart_comp);
1275                 iscsit_put_transport(conn->conn_transport);
1276                 kfree(conn);
1277                 conn = NULL;
1278                 goto exit;
1279         } else if (rc < 0) {
1280                 spin_lock_bh(&np->np_thread_lock);
1281                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1282                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1283                         spin_unlock_bh(&np->np_thread_lock);
1284                         complete(&np->np_restart_comp);
1285                         iscsit_put_transport(conn->conn_transport);
1286                         kfree(conn);
1287                         conn = NULL;
1288                         /* Get another socket */
1289                         return 1;
1290                 }
1291                 spin_unlock_bh(&np->np_thread_lock);
1292                 iscsit_put_transport(conn->conn_transport);
1293                 kfree(conn);
1294                 conn = NULL;
1295                 goto out;
1296         }
1297         /*
1298          * Perform the remaining iSCSI connection initialization items..
1299          */
1300         login = iscsi_login_init_conn(conn);
1301         if (!login) {
1302                 goto new_sess_out;
1303         }
1304
1305         iscsi_start_login_thread_timer(np);
1306
1307         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1308         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1309         /*
1310          * This will process the first login request + payload..
1311          */
1312         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1313         if (rc == 1)
1314                 return 1;
1315         else if (rc < 0)
1316                 goto new_sess_out;
1317
1318         buffer = &login->req[0];
1319         pdu = (struct iscsi_login_req *)buffer;
1320         /*
1321          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1322          * when Status-Class != 0.
1323         */
1324         conn->login_itt = pdu->itt;
1325
1326         spin_lock_bh(&np->np_thread_lock);
1327         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1328                 spin_unlock_bh(&np->np_thread_lock);
1329                 pr_err("iSCSI Network Portal on %pISpc currently not"
1330                         " active.\n", &np->np_sockaddr);
1331                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1332                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1333                 goto new_sess_out;
1334         }
1335         spin_unlock_bh(&np->np_thread_lock);
1336
1337         conn->network_transport = np->np_network_transport;
1338
1339         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1340                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1341                 &conn->local_sockaddr);
1342
1343         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1344         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1345
1346         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1347                         pdu->min_version) < 0)
1348                 goto new_sess_out;
1349
1350         zero_tsih = (pdu->tsih == 0x0000);
1351         if (zero_tsih) {
1352                 /*
1353                  * This is the leading connection of a new session.
1354                  * We wait until after authentication to check for
1355                  * session reinstatement.
1356                  */
1357                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1358                         goto new_sess_out;
1359         } else {
1360                 /*
1361                  * Add a new connection to an existing session.
1362                  * We check for a non-existant session in
1363                  * iscsi_login_non_zero_tsih_s2() below based
1364                  * on ISID/TSIH, but wait until after authentication
1365                  * to check for connection reinstatement, etc.
1366                  */
1367                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1368                         goto new_sess_out;
1369         }
1370         /*
1371          * SessionType: Discovery
1372          *
1373          *      Locates Default Portal
1374          *
1375          * SessionType: Normal
1376          *
1377          *      Locates Target Portal from NP -> Target IQN
1378          */
1379         rc = iscsi_target_locate_portal(np, conn, login);
1380         if (rc < 0) {
1381                 tpg = conn->tpg;
1382                 goto new_sess_out;
1383         }
1384         login->zero_tsih = zero_tsih;
1385
1386         if (conn->sess)
1387                 conn->sess->se_sess->sup_prot_ops =
1388                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1389
1390         tpg = conn->tpg;
1391         if (!tpg) {
1392                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1393                 goto new_sess_out;
1394         }
1395
1396         if (zero_tsih) {
1397                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1398                         goto new_sess_out;
1399         } else {
1400                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1401                         goto old_sess_out;
1402         }
1403
1404         if (conn->conn_transport->iscsit_validate_params) {
1405                 ret = conn->conn_transport->iscsit_validate_params(conn);
1406                 if (ret < 0) {
1407                         if (zero_tsih)
1408                                 goto new_sess_out;
1409                         else
1410                                 goto old_sess_out;
1411                 }
1412         }
1413
1414         ret = iscsi_target_start_negotiation(login, conn);
1415         if (ret < 0)
1416                 goto new_sess_out;
1417
1418         iscsi_stop_login_thread_timer(np);
1419
1420         if (ret == 1) {
1421                 tpg_np = conn->tpg_np;
1422
1423                 iscsi_post_login_handler(np, conn, zero_tsih);
1424                 iscsit_deaccess_np(np, tpg, tpg_np);
1425         }
1426
1427         tpg = NULL;
1428         tpg_np = NULL;
1429         /* Get another socket */
1430         return 1;
1431
1432 new_sess_out:
1433         new_sess = true;
1434 old_sess_out:
1435         tpg_np = conn->tpg_np;
1436         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1437         new_sess = false;
1438
1439         if (tpg) {
1440                 iscsit_deaccess_np(np, tpg, tpg_np);
1441                 tpg = NULL;
1442                 tpg_np = NULL;
1443         }
1444
1445 out:
1446         return 1;
1447
1448 exit:
1449         iscsi_stop_login_thread_timer(np);
1450         spin_lock_bh(&np->np_thread_lock);
1451         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1452         spin_unlock_bh(&np->np_thread_lock);
1453
1454         return 0;
1455 }
1456
1457 int iscsi_target_login_thread(void *arg)
1458 {
1459         struct iscsi_np *np = arg;
1460         int ret;
1461
1462         allow_signal(SIGINT);
1463
1464         while (1) {
1465                 ret = __iscsi_target_login_thread(np);
1466                 /*
1467                  * We break and exit here unless another sock_accept() call
1468                  * is expected.
1469                  */
1470                 if (ret != 1)
1471                         break;
1472         }
1473
1474         while (!kthread_should_stop()) {
1475                 msleep(100);
1476         }
1477
1478         return 0;
1479 }