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         idr_preload(GFP_KERNEL);
 337         spin_lock_bh(&sess_idr_lock);
 338         ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
 339         if (ret >= 0)
 340                 sess->session_index = ret;
 341         spin_unlock_bh(&sess_idr_lock);
 342         idr_preload_end();
 343
 344         if (ret < 0) {
 345                 pr_err("idr_alloc() for sess_idr failed\n");
 346                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 347                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 348                 kfree(sess);
 349                 return -ENOMEM;
 350         }
 351
 352         sess->creation_time = get_jiffies_64();
 353         /*
 354          * The FFP CmdSN window values will be allocated from the TPG's
 355          * Initiator Node's ACL once the login has been successfully completed.
 356          */
 357         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 358
 359         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 360         if (!sess->sess_ops) {
 361                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 362                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 363                 pr_err("Unable to allocate memory for"
 364                                 " struct iscsi_sess_ops.\n");
 365                 kfree(sess);
 366                 return -ENOMEM;
 367         }
 368
 369         sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
 370         if (IS_ERR(sess->se_sess)) {
 371                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 372                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 373                 kfree(sess->sess_ops);
 374                 kfree(sess);
 375                 return -ENOMEM;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static int iscsi_login_zero_tsih_s2(
 382         struct iscsi_conn *conn)
 383 {
 384         struct iscsi_node_attrib *na;
 385         struct iscsi_session *sess = conn->sess;
 386         bool iser = false;
 387
 388         sess->tpg = conn->tpg;
 389
 390         /*
 391          * Assign a new TPG Session Handle.  Note this is protected with
 392          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 393          */
 394         sess->tsih = ++sess->tpg->ntsih;
 395         if (!sess->tsih)
 396                 sess->tsih = ++sess->tpg->ntsih;
 397
 398         /*
 399          * Create the default params from user defined values..
 400          */
 401         if (iscsi_copy_param_list(&conn->param_list,
 402                                 conn->tpg->param_list, 1) < 0) {
 403                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 404                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 405                 return -1;
 406         }
 407
 408         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 409                 iser = true;
 410
 411         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 412
 413         if (sess->sess_ops->SessionType)
 414                 return iscsi_set_keys_irrelevant_for_discovery(
 415                                 conn->param_list);
 416
 417         na = iscsit_tpg_get_node_attrib(sess);
 418
 419         /*
 420          * Need to send TargetPortalGroupTag back in first login response
 421          * on any iSCSI connection where the Initiator provides TargetName.
 422          * See 5.3.1.  Login Phase Start
 423          *
 424          * In our case, we have already located the struct iscsi_tiqn at this point.
 425          */
 426         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 427                 return -1;
 428
 429         /*
 430          * Workaround for Initiators that have broken connection recovery logic.
 431          *
 432          * "We would really like to get rid of this." Linux-iSCSI.org team
 433          */
 434         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 435                 return -1;
 436
 437         /*
 438          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 439          */
 440         if (iser) {
 441                 struct iscsi_param *param;
 442                 unsigned long mrdsl, off;
 443                 int rc;
 444
 445                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 446                         return -1;
 447
 448                 /*
 449                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 450                  * Immediate Data + Unsolicited Data-OUT if necessary..
 451                  */
 452                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 453                                                   conn->param_list);
 454                 if (!param) {
 455                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 456                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 457                         return -1;
 458                 }
 459                 rc = kstrtoul(param->value, 0, &mrdsl);
 460                 if (rc < 0) {
 461                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 462                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 463                         return -1;
 464                 }
 465                 off = mrdsl % PAGE_SIZE;
 466                 if (!off)
 467                         goto check_prot;
 468
 469                 if (mrdsl < PAGE_SIZE)
 470                         mrdsl = PAGE_SIZE;
 471                 else
 472                         mrdsl -= off;
 473
 474                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 475                         " to PAGE_SIZE\n", mrdsl);
 476
 477                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 478                         return -1;
 479                 /*
 480                  * ISER currently requires that ImmediateData + Unsolicited
 481                  * Data be disabled when protection / signature MRs are enabled.
 482                  */
 483 check_prot:
 484                 if (sess->se_sess->sup_prot_ops &
 485                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 486                     TARGET_PROT_DOUT_INSERT)) {
 487
 488                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 489                                 return -1;
 490
 491                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 492                                 return -1;
 493
 494                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 495                                  " T10-PI enabled ISER session\n");
 496                 }
 497         }
 498
 499         return 0;
 500 }
 501
 502 static int iscsi_login_non_zero_tsih_s1(
 503         struct iscsi_conn *conn,
 504         unsigned char *buf)
 505 {
 506         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 507
 508         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 509 }
 510
 511 /*
 512  *      Add a new connection to an existing session.
 513  */
 514 static int iscsi_login_non_zero_tsih_s2(
 515         struct iscsi_conn *conn,
 516         unsigned char *buf)
 517 {
 518         struct iscsi_portal_group *tpg = conn->tpg;
 519         struct iscsi_session *sess = NULL, *sess_p = NULL;
 520         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 521         struct se_session *se_sess, *se_sess_tmp;
 522         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 523         bool iser = false;
 524
 525         spin_lock_bh(&se_tpg->session_lock);
 526         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 527                         sess_list) {
 528
 529                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 530                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 531                     atomic_read(&sess_p->session_logout) ||
 532                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 533                         continue;
 534                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 535                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 536                         iscsit_inc_session_usage_count(sess_p);
 537                         iscsit_stop_time2retain_timer(sess_p);
 538                         sess = sess_p;
 539                         break;
 540                 }
 541         }
 542         spin_unlock_bh(&se_tpg->session_lock);
 543
 544         /*
 545          * If the Time2Retain handler has expired, the session is already gone.
 546          */
 547         if (!sess) {
 548                 pr_err("Initiator attempting to add a connection to"
 549                         " a non-existent session, rejecting iSCSI Login.\n");
 550                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 551                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 552                 return -1;
 553         }
 554
 555         /*
 556          * Stop the Time2Retain timer if this is a failed session, we restart
 557          * the timer if the login is not successful.
 558          */
 559         spin_lock_bh(&sess->conn_lock);
 560         if (sess->session_state == TARG_SESS_STATE_FAILED)
 561                 atomic_set(&sess->session_continuation, 1);
 562         spin_unlock_bh(&sess->conn_lock);
 563
 564         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 565             iscsi_copy_param_list(&conn->param_list,
 566                         conn->tpg->param_list, 0) < 0) {
 567                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 568                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 569                 return -1;
 570         }
 571
 572         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 573                 iser = true;
 574
 575         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 576         /*
 577          * Need to send TargetPortalGroupTag back in first login response
 578          * on any iSCSI connection where the Initiator provides TargetName.
 579          * See 5.3.1.  Login Phase Start
 580          *
 581          * In our case, we have already located the struct iscsi_tiqn at this point.
 582          */
 583         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 584                 return -1;
 585
 586         return 0;
 587 }
 588
 589 int iscsi_login_post_auth_non_zero_tsih(
 590         struct iscsi_conn *conn,
 591         u16 cid,
 592         u32 exp_statsn)
 593 {
 594         struct iscsi_conn *conn_ptr = NULL;
 595         struct iscsi_conn_recovery *cr = NULL;
 596         struct iscsi_session *sess = conn->sess;
 597
 598         /*
 599          * By following item 5 in the login table,  if we have found
 600          * an existing ISID and a valid/existing TSIH and an existing
 601          * CID we do connection reinstatement.  Currently we dont not
 602          * support it so we send back an non-zero status class to the
 603          * initiator and release the new connection.
 604          */
 605         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 606         if (conn_ptr) {
 607                 pr_err("Connection exists with CID %hu for %s,"
 608                         " performing connection reinstatement.\n",
 609                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 610
 611                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 612                 iscsit_dec_conn_usage_count(conn_ptr);
 613         }
 614
 615         /*
 616          * Check for any connection recovery entires containing CID.
 617          * We use the original ExpStatSN sent in the first login request
 618          * to acknowledge commands for the failed connection.
 619          *
 620          * Also note that an explict logout may have already been sent,
 621          * but the response may not be sent due to additional connection
 622          * loss.
 623          */
 624         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 625                 cr = iscsit_get_inactive_connection_recovery_entry(
 626                                 sess, cid);
 627                 if (cr) {
 628                         pr_debug("Performing implicit logout"
 629                                 " for connection recovery on CID: %hu\n",
 630                                         conn->cid);
 631                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 632                 }
 633         }
 634
 635         /*
 636          * Else we follow item 4 from the login table in that we have
 637          * found an existing ISID and a valid/existing TSIH and a new
 638          * CID we go ahead and continue to add a new connection to the
 639          * session.
 640          */
 641         pr_debug("Adding CID %hu to existing session for %s.\n",
 642                         cid, sess->sess_ops->InitiatorName);
 643
 644         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 645                 pr_err("Adding additional connection to this session"
 646                         " would exceed MaxConnections %d, login failed.\n",
 647                                 sess->sess_ops->MaxConnections);
 648                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 649                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 650                 return -1;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 657 {
 658         struct iscsi_session *sess = conn->sess;
 659         /*
 660          * FIXME: Unsolicited NopIN support for ISER
 661          */
 662         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 663                 return;
 664
 665         if (!sess->sess_ops->SessionType)
 666                 iscsit_start_nopin_timer(conn);
 667 }
 668
 669 int iscsit_start_kthreads(struct iscsi_conn *conn)
 670 {
 671         int ret = 0;
 672
 673         spin_lock(&iscsit_global->ts_bitmap_lock);
 674         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 675                                         ISCSIT_BITMAP_BITS, get_order(1));
 676         spin_unlock(&iscsit_global->ts_bitmap_lock);
 677
 678         if (conn->bitmap_id < 0) {
 679                 pr_err("bitmap_find_free_region() failed for"
 680                        " iscsit_start_kthreads()\n");
 681                 return -ENOMEM;
 682         }
 683
 684         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 685                                       "%s", ISCSI_TX_THREAD_NAME);
 686         if (IS_ERR(conn->tx_thread)) {
 687                 pr_err("Unable to start iscsi_target_tx_thread\n");
 688                 ret = PTR_ERR(conn->tx_thread);
 689                 goto out_bitmap;
 690         }
 691         conn->tx_thread_active = true;
 692
 693         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 694                                       "%s", ISCSI_RX_THREAD_NAME);
 695         if (IS_ERR(conn->rx_thread)) {
 696                 pr_err("Unable to start iscsi_target_rx_thread\n");
 697                 ret = PTR_ERR(conn->rx_thread);
 698                 goto out_tx;
 699         }
 700         conn->rx_thread_active = true;
 701
 702         return 0;
 703 out_tx:
 704         send_sig(SIGINT, conn->tx_thread, 1);
 705         kthread_stop(conn->tx_thread);
 706         conn->tx_thread_active = false;
 707 out_bitmap:
 708         spin_lock(&iscsit_global->ts_bitmap_lock);
 709         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 710                               get_order(1));
 711         spin_unlock(&iscsit_global->ts_bitmap_lock);
 712         return ret;
 713 }
 714
 715 void iscsi_post_login_handler(
 716         struct iscsi_np *np,
 717         struct iscsi_conn *conn,
 718         u8 zero_tsih)
 719 {
 720         int stop_timer = 0;
 721         struct iscsi_session *sess = conn->sess;
 722         struct se_session *se_sess = sess->se_sess;
 723         struct iscsi_portal_group *tpg = sess->tpg;
 724         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 725
 726         iscsit_inc_conn_usage_count(conn);
 727
 728         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 729                         ISCSI_LOGIN_STATUS_ACCEPT);
 730
 731         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 732         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 733
 734         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 735         /*
 736          * SCSI Initiator -> SCSI Target Port Mapping
 737          */
 738         if (!zero_tsih) {
 739                 iscsi_set_session_parameters(sess->sess_ops,
 740                                 conn->param_list, 0);
 741                 iscsi_release_param_list(conn->param_list);
 742                 conn->param_list = NULL;
 743
 744                 spin_lock_bh(&sess->conn_lock);
 745                 atomic_set(&sess->session_continuation, 0);
 746                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 747                         pr_debug("Moving to"
 748                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 749                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 750                         stop_timer = 1;
 751                 }
 752
 753                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 754                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 755                         &conn->local_sockaddr, tpg->tpgt);
 756
 757                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 758                 atomic_inc(&sess->nconn);
 759                 pr_debug("Incremented iSCSI Connection count to %hu"
 760                         " from node: %s\n", atomic_read(&sess->nconn),
 761                         sess->sess_ops->InitiatorName);
 762                 spin_unlock_bh(&sess->conn_lock);
 763
 764                 iscsi_post_login_start_timers(conn);
 765                 /*
 766                  * Determine CPU mask to ensure connection's RX and TX kthreads
 767                  * are scheduled on the same CPU.
 768                  */
 769                 iscsit_thread_get_cpumask(conn);
 770                 conn->conn_rx_reset_cpumask = 1;
 771                 conn->conn_tx_reset_cpumask = 1;
 772                 /*
 773                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 774                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 775                  */
 776                 complete(&conn->rx_login_comp);
 777                 iscsit_dec_conn_usage_count(conn);
 778
 779                 if (stop_timer) {
 780                         spin_lock_bh(&se_tpg->session_lock);
 781                         iscsit_stop_time2retain_timer(sess);
 782                         spin_unlock_bh(&se_tpg->session_lock);
 783                 }
 784                 iscsit_dec_session_usage_count(sess);
 785                 return;
 786         }
 787
 788         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 789         iscsi_release_param_list(conn->param_list);
 790         conn->param_list = NULL;
 791
 792         iscsit_determine_maxcmdsn(sess);
 793
 794         spin_lock_bh(&se_tpg->session_lock);
 795         __transport_register_session(&sess->tpg->tpg_se_tpg,
 796                         se_sess->se_node_acl, se_sess, sess);
 797         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 798         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 799
 800         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 801                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 802                 tpg->tpgt);
 803
 804         spin_lock_bh(&sess->conn_lock);
 805         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 806         atomic_inc(&sess->nconn);
 807         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 808                 " %s\n", atomic_read(&sess->nconn),
 809                 sess->sess_ops->InitiatorName);
 810         spin_unlock_bh(&sess->conn_lock);
 811
 812         sess->sid = tpg->sid++;
 813         if (!sess->sid)
 814                 sess->sid = tpg->sid++;
 815         pr_debug("Established iSCSI session from node: %s\n",
 816                         sess->sess_ops->InitiatorName);
 817
 818         tpg->nsessions++;
 819         if (tpg->tpg_tiqn)
 820                 tpg->tpg_tiqn->tiqn_nsessions++;
 821
 822         pr_debug("Incremented number of active iSCSI sessions to %u on"
 823                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 824         spin_unlock_bh(&se_tpg->session_lock);
 825
 826         iscsi_post_login_start_timers(conn);
 827         /*
 828          * Determine CPU mask to ensure connection's RX and TX kthreads
 829          * are scheduled on the same CPU.
 830          */
 831         iscsit_thread_get_cpumask(conn);
 832         conn->conn_rx_reset_cpumask = 1;
 833         conn->conn_tx_reset_cpumask = 1;
 834         /*
 835          * Wakeup the sleeping iscsi_target_rx_thread() now that
 836          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 837          */
 838         complete(&conn->rx_login_comp);
 839         iscsit_dec_conn_usage_count(conn);
 840 }
 841
 842 static void iscsi_handle_login_thread_timeout(unsigned long data)
 843 {
 844         struct iscsi_np *np = (struct iscsi_np *) data;
 845
 846         spin_lock_bh(&np->np_thread_lock);
 847         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 848                         &np->np_sockaddr);
 849
 850         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 851                 spin_unlock_bh(&np->np_thread_lock);
 852                 return;
 853         }
 854
 855         if (np->np_thread)
 856                 send_sig(SIGINT, np->np_thread, 1);
 857
 858         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 859         spin_unlock_bh(&np->np_thread_lock);
 860 }
 861
 862 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 863 {
 864         /*
 865          * This used the TA_LOGIN_TIMEOUT constant because at this
 866          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 867          */
 868         spin_lock_bh(&np->np_thread_lock);
 869         init_timer(&np->np_login_timer);
 870         np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 871         np->np_login_timer.data = (unsigned long)np;
 872         np->np_login_timer.function = iscsi_handle_login_thread_timeout;
 873         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 874         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 875         add_timer(&np->np_login_timer);
 876
 877         pr_debug("Added timeout timer to iSCSI login request for"
 878                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 879         spin_unlock_bh(&np->np_thread_lock);
 880 }
 881
 882 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 883 {
 884         spin_lock_bh(&np->np_thread_lock);
 885         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 886                 spin_unlock_bh(&np->np_thread_lock);
 887                 return;
 888         }
 889         np->np_login_timer_flags |= ISCSI_TF_STOP;
 890         spin_unlock_bh(&np->np_thread_lock);
 891
 892         del_timer_sync(&np->np_login_timer);
 893
 894         spin_lock_bh(&np->np_thread_lock);
 895         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 896         spin_unlock_bh(&np->np_thread_lock);
 897 }
 898
 899 int iscsit_setup_np(
 900         struct iscsi_np *np,
 901         struct sockaddr_storage *sockaddr)
 902 {
 903         struct socket *sock = NULL;
 904         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 905
 906         switch (np->np_network_transport) {
 907         case ISCSI_TCP:
 908                 np->np_ip_proto = IPPROTO_TCP;
 909                 np->np_sock_type = SOCK_STREAM;
 910                 break;
 911         case ISCSI_SCTP_TCP:
 912                 np->np_ip_proto = IPPROTO_SCTP;
 913                 np->np_sock_type = SOCK_STREAM;
 914                 break;
 915         case ISCSI_SCTP_UDP:
 916                 np->np_ip_proto = IPPROTO_SCTP;
 917                 np->np_sock_type = SOCK_SEQPACKET;
 918                 break;
 919         default:
 920                 pr_err("Unsupported network_transport: %d\n",
 921                                 np->np_network_transport);
 922                 return -EINVAL;
 923         }
 924
 925         np->np_ip_proto = IPPROTO_TCP;
 926         np->np_sock_type = SOCK_STREAM;
 927
 928         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 929                         np->np_ip_proto, &sock);
 930         if (ret < 0) {
 931                 pr_err("sock_create() failed.\n");
 932                 return ret;
 933         }
 934         np->np_socket = sock;
 935         /*
 936          * Setup the np->np_sockaddr from the passed sockaddr setup
 937          * in iscsi_target_configfs.c code..
 938          */
 939         memcpy(&np->np_sockaddr, sockaddr,
 940                         sizeof(struct sockaddr_storage));
 941
 942         if (sockaddr->ss_family == AF_INET6)
 943                 len = sizeof(struct sockaddr_in6);
 944         else
 945                 len = sizeof(struct sockaddr_in);
 946         /*
 947          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 948          */
 949         /* FIXME: Someone please explain why this is endian-safe */
 950         opt = 1;
 951         if (np->np_network_transport == ISCSI_TCP) {
 952                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 953                                 (char *)&opt, sizeof(opt));
 954                 if (ret < 0) {
 955                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 956                                 " failed: %d\n", ret);
 957                         goto fail;
 958                 }
 959         }
 960
 961         /* FIXME: Someone please explain why this is endian-safe */
 962         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 963                         (char *)&opt, sizeof(opt));
 964         if (ret < 0) {
 965                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 966                         " failed\n");
 967                 goto fail;
 968         }
 969
 970         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 971                         (char *)&opt, sizeof(opt));
 972         if (ret < 0) {
 973                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 974                         " failed\n");
 975                 goto fail;
 976         }
 977
 978         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 979         if (ret < 0) {
 980                 pr_err("kernel_bind() failed: %d\n", ret);
 981                 goto fail;
 982         }
 983
 984         ret = kernel_listen(sock, backlog);
 985         if (ret != 0) {
 986                 pr_err("kernel_listen() failed: %d\n", ret);
 987                 goto fail;
 988         }
 989
 990         return 0;
 991 fail:
 992         np->np_socket = NULL;
 993         sock_release(sock);
 994         return ret;
 995 }
 996
 997 int iscsi_target_setup_login_socket(
 998         struct iscsi_np *np,
 999         struct sockaddr_storage *sockaddr)
1000 {
1001         struct iscsit_transport *t;
1002         int rc;
1003
1004         t = iscsit_get_transport(np->np_network_transport);
1005         if (!t)
1006                 return -EINVAL;
1007
1008         rc = t->iscsit_setup_np(np, sockaddr);
1009         if (rc < 0) {
1010                 iscsit_put_transport(t);
1011                 return rc;
1012         }
1013
1014         np->np_transport = t;
1015         np->enabled = true;
1016         return 0;
1017 }
1018
1019 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1020 {
1021         struct socket *new_sock, *sock = np->np_socket;
1022         struct sockaddr_in sock_in;
1023         struct sockaddr_in6 sock_in6;
1024         int rc, err;
1025
1026         rc = kernel_accept(sock, &new_sock, 0);
1027         if (rc < 0)
1028                 return rc;
1029
1030         conn->sock = new_sock;
1031         conn->login_family = np->np_sockaddr.ss_family;
1032
1033         if (np->np_sockaddr.ss_family == AF_INET6) {
1034                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1035
1036                 rc = conn->sock->ops->getname(conn->sock,
1037                                 (struct sockaddr *)&sock_in6, &err, 1);
1038                 if (!rc) {
1039                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1040                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1041                         } else {
1042                                 /* Pretend to be an ipv4 socket */
1043                                 sock_in.sin_family = AF_INET;
1044                                 sock_in.sin_port = sock_in6.sin6_port;
1045                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1046                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1047                         }
1048                 }
1049
1050                 rc = conn->sock->ops->getname(conn->sock,
1051                                 (struct sockaddr *)&sock_in6, &err, 0);
1052                 if (!rc) {
1053                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1054                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1055                         } else {
1056                                 /* Pretend to be an ipv4 socket */
1057                                 sock_in.sin_family = AF_INET;
1058                                 sock_in.sin_port = sock_in6.sin6_port;
1059                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1060                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1061                         }
1062                 }
1063         } else {
1064                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1065
1066                 rc = conn->sock->ops->getname(conn->sock,
1067                                 (struct sockaddr *)&sock_in, &err, 1);
1068                 if (!rc)
1069                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1070
1071                 rc = conn->sock->ops->getname(conn->sock,
1072                                 (struct sockaddr *)&sock_in, &err, 0);
1073                 if (!rc)
1074                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1075         }
1076
1077         return 0;
1078 }
1079
1080 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1081 {
1082         struct iscsi_login_req *login_req;
1083         u32 padding = 0, payload_length;
1084
1085         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1086                 return -1;
1087
1088         login_req = (struct iscsi_login_req *)login->req;
1089         payload_length  = ntoh24(login_req->dlength);
1090         padding = ((-payload_length) & 3);
1091
1092         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1093                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1094                 login_req->flags, login_req->itt, login_req->cmdsn,
1095                 login_req->exp_statsn, login_req->cid, payload_length);
1096         /*
1097          * Setup the initial iscsi_login values from the leading
1098          * login request PDU.
1099          */
1100         if (login->first_request) {
1101                 login_req = (struct iscsi_login_req *)login->req;
1102                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1103                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1104                 login->version_min      = login_req->min_version;
1105                 login->version_max      = login_req->max_version;
1106                 memcpy(login->isid, login_req->isid, 6);
1107                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1108                 login->init_task_tag    = login_req->itt;
1109                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1110                 login->cid              = be16_to_cpu(login_req->cid);
1111                 login->tsih             = be16_to_cpu(login_req->tsih);
1112         }
1113
1114         if (iscsi_target_check_login_request(conn, login) < 0)
1115                 return -1;
1116
1117         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1118         if (iscsi_login_rx_data(conn, login->req_buf,
1119                                 payload_length + padding) < 0)
1120                 return -1;
1121
1122         return 0;
1123 }
1124
1125 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1126                         u32 length)
1127 {
1128         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1129                 return -1;
1130
1131         return 0;
1132 }
1133
1134 static int
1135 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1136 {
1137         int rc;
1138
1139         if (!t->owner) {
1140                 conn->conn_transport = t;
1141                 return 0;
1142         }
1143
1144         rc = try_module_get(t->owner);
1145         if (!rc) {
1146                 pr_err("try_module_get() failed for %s\n", t->name);
1147                 return -EINVAL;
1148         }
1149
1150         conn->conn_transport = t;
1151         return 0;
1152 }
1153
1154 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1155                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1156 {
1157         if (!new_sess)
1158                 goto old_sess_out;
1159
1160         pr_err("iSCSI Login negotiation failed.\n");
1161         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1162                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1163         if (!zero_tsih || !conn->sess)
1164                 goto old_sess_out;
1165         if (conn->sess->se_sess)
1166                 transport_free_session(conn->sess->se_sess);
1167         if (conn->sess->session_index != 0) {
1168                 spin_lock_bh(&sess_idr_lock);
1169                 idr_remove(&sess_idr, conn->sess->session_index);
1170                 spin_unlock_bh(&sess_idr_lock);
1171         }
1172         kfree(conn->sess->sess_ops);
1173         kfree(conn->sess);
1174         conn->sess = NULL;
1175
1176 old_sess_out:
1177         iscsi_stop_login_thread_timer(np);
1178         /*
1179          * If login negotiation fails check if the Time2Retain timer
1180          * needs to be restarted.
1181          */
1182         if (!zero_tsih && conn->sess) {
1183                 spin_lock_bh(&conn->sess->conn_lock);
1184                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1185                         struct se_portal_group *se_tpg =
1186                                         &conn->tpg->tpg_se_tpg;
1187
1188                         atomic_set(&conn->sess->session_continuation, 0);
1189                         spin_unlock_bh(&conn->sess->conn_lock);
1190                         spin_lock_bh(&se_tpg->session_lock);
1191                         iscsit_start_time2retain_handler(conn->sess);
1192                         spin_unlock_bh(&se_tpg->session_lock);
1193                 } else
1194                         spin_unlock_bh(&conn->sess->conn_lock);
1195                 iscsit_dec_session_usage_count(conn->sess);
1196         }
1197
1198         ahash_request_free(conn->conn_tx_hash);
1199         if (conn->conn_rx_hash) {
1200                 struct crypto_ahash *tfm;
1201
1202                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1203                 ahash_request_free(conn->conn_rx_hash);
1204                 crypto_free_ahash(tfm);
1205         }
1206
1207         free_cpumask_var(conn->conn_cpumask);
1208
1209         kfree(conn->conn_ops);
1210
1211         if (conn->param_list) {
1212                 iscsi_release_param_list(conn->param_list);
1213                 conn->param_list = NULL;
1214         }
1215         iscsi_target_nego_release(conn);
1216
1217         if (conn->sock) {
1218                 sock_release(conn->sock);
1219                 conn->sock = NULL;
1220         }
1221
1222         if (conn->conn_transport->iscsit_wait_conn)
1223                 conn->conn_transport->iscsit_wait_conn(conn);
1224
1225         if (conn->conn_transport->iscsit_free_conn)
1226                 conn->conn_transport->iscsit_free_conn(conn);
1227
1228         iscsit_put_transport(conn->conn_transport);
1229         kfree(conn);
1230 }
1231
1232 static int __iscsi_target_login_thread(struct iscsi_np *np)
1233 {
1234         u8 *buffer, zero_tsih = 0;
1235         int ret = 0, rc;
1236         struct iscsi_conn *conn = NULL;
1237         struct iscsi_login *login;
1238         struct iscsi_portal_group *tpg = NULL;
1239         struct iscsi_login_req *pdu;
1240         struct iscsi_tpg_np *tpg_np;
1241         bool new_sess = false;
1242
1243         flush_signals(current);
1244
1245         spin_lock_bh(&np->np_thread_lock);
1246         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1247                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1248                 spin_unlock_bh(&np->np_thread_lock);
1249                 complete(&np->np_restart_comp);
1250                 return 1;
1251         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1252                 spin_unlock_bh(&np->np_thread_lock);
1253                 goto exit;
1254         } else {
1255                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1256         }
1257         spin_unlock_bh(&np->np_thread_lock);
1258
1259         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1260         if (!conn) {
1261                 pr_err("Could not allocate memory for"
1262                         " new connection\n");
1263                 /* Get another socket */
1264                 return 1;
1265         }
1266         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1267         conn->conn_state = TARG_CONN_STATE_FREE;
1268
1269         if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1270                 kfree(conn);
1271                 return 1;
1272         }
1273
1274         rc = np->np_transport->iscsit_accept_np(np, conn);
1275         if (rc == -ENOSYS) {
1276                 complete(&np->np_restart_comp);
1277                 iscsit_put_transport(conn->conn_transport);
1278                 kfree(conn);
1279                 conn = NULL;
1280                 goto exit;
1281         } else if (rc < 0) {
1282                 spin_lock_bh(&np->np_thread_lock);
1283                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1284                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1285                         spin_unlock_bh(&np->np_thread_lock);
1286                         complete(&np->np_restart_comp);
1287                         iscsit_put_transport(conn->conn_transport);
1288                         kfree(conn);
1289                         conn = NULL;
1290                         /* Get another socket */
1291                         return 1;
1292                 }
1293                 spin_unlock_bh(&np->np_thread_lock);
1294                 iscsit_put_transport(conn->conn_transport);
1295                 kfree(conn);
1296                 conn = NULL;
1297                 goto out;
1298         }
1299         /*
1300          * Perform the remaining iSCSI connection initialization items..
1301          */
1302         login = iscsi_login_init_conn(conn);
1303         if (!login) {
1304                 goto new_sess_out;
1305         }
1306
1307         iscsi_start_login_thread_timer(np);
1308
1309         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1310         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1311         /*
1312          * This will process the first login request + payload..
1313          */
1314         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1315         if (rc == 1)
1316                 return 1;
1317         else if (rc < 0)
1318                 goto new_sess_out;
1319
1320         buffer = &login->req[0];
1321         pdu = (struct iscsi_login_req *)buffer;
1322         /*
1323          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1324          * when Status-Class != 0.
1325         */
1326         conn->login_itt = pdu->itt;
1327
1328         spin_lock_bh(&np->np_thread_lock);
1329         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1330                 spin_unlock_bh(&np->np_thread_lock);
1331                 pr_err("iSCSI Network Portal on %pISpc currently not"
1332                         " active.\n", &np->np_sockaddr);
1333                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1334                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1335                 goto new_sess_out;
1336         }
1337         spin_unlock_bh(&np->np_thread_lock);
1338
1339         conn->network_transport = np->np_network_transport;
1340
1341         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1342                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1343                 &conn->local_sockaddr);
1344
1345         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1346         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1347
1348         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1349                         pdu->min_version) < 0)
1350                 goto new_sess_out;
1351
1352         zero_tsih = (pdu->tsih == 0x0000);
1353         if (zero_tsih) {
1354                 /*
1355                  * This is the leading connection of a new session.
1356                  * We wait until after authentication to check for
1357                  * session reinstatement.
1358                  */
1359                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1360                         goto new_sess_out;
1361         } else {
1362                 /*
1363                  * Add a new connection to an existing session.
1364                  * We check for a non-existant session in
1365                  * iscsi_login_non_zero_tsih_s2() below based
1366                  * on ISID/TSIH, but wait until after authentication
1367                  * to check for connection reinstatement, etc.
1368                  */
1369                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1370                         goto new_sess_out;
1371         }
1372         /*
1373          * SessionType: Discovery
1374          *
1375          *      Locates Default Portal
1376          *
1377          * SessionType: Normal
1378          *
1379          *      Locates Target Portal from NP -> Target IQN
1380          */
1381         rc = iscsi_target_locate_portal(np, conn, login);
1382         if (rc < 0) {
1383                 tpg = conn->tpg;
1384                 goto new_sess_out;
1385         }
1386         login->zero_tsih = zero_tsih;
1387
1388         if (conn->sess)
1389                 conn->sess->se_sess->sup_prot_ops =
1390                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1391
1392         tpg = conn->tpg;
1393         if (!tpg) {
1394                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1395                 goto new_sess_out;
1396         }
1397
1398         if (zero_tsih) {
1399                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1400                         goto new_sess_out;
1401         } else {
1402                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1403                         goto old_sess_out;
1404         }
1405
1406         if (conn->conn_transport->iscsit_validate_params) {
1407                 ret = conn->conn_transport->iscsit_validate_params(conn);
1408                 if (ret < 0) {
1409                         if (zero_tsih)
1410                                 goto new_sess_out;
1411                         else
1412                                 goto old_sess_out;
1413                 }
1414         }
1415
1416         ret = iscsi_target_start_negotiation(login, conn);
1417         if (ret < 0)
1418                 goto new_sess_out;
1419
1420         iscsi_stop_login_thread_timer(np);
1421
1422         if (ret == 1) {
1423                 tpg_np = conn->tpg_np;
1424
1425                 iscsi_post_login_handler(np, conn, zero_tsih);
1426                 iscsit_deaccess_np(np, tpg, tpg_np);
1427         }
1428
1429         tpg = NULL;
1430         tpg_np = NULL;
1431         /* Get another socket */
1432         return 1;
1433
1434 new_sess_out:
1435         new_sess = true;
1436 old_sess_out:
1437         tpg_np = conn->tpg_np;
1438         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1439         new_sess = false;
1440
1441         if (tpg) {
1442                 iscsit_deaccess_np(np, tpg, tpg_np);
1443                 tpg = NULL;
1444                 tpg_np = NULL;
1445         }
1446
1447 out:
1448         return 1;
1449
1450 exit:
1451         iscsi_stop_login_thread_timer(np);
1452         spin_lock_bh(&np->np_thread_lock);
1453         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1454         spin_unlock_bh(&np->np_thread_lock);
1455
1456         return 0;
1457 }
1458
1459 int iscsi_target_login_thread(void *arg)
1460 {
1461         struct iscsi_np *np = arg;
1462         int ret;
1463
1464         allow_signal(SIGINT);
1465
1466         while (1) {
1467                 ret = __iscsi_target_login_thread(np);
1468                 /*
1469                  * We break and exit here unless another sock_accept() call
1470                  * is expected.
1471                  */
1472                 if (ret != 1)
1473                         break;
1474         }
1475
1476         while (!kthread_should_stop()) {
1477                 msleep(100);
1478         }
1479
1480         return 0;
1481 }