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_login = login;
  71
  72         return login;
  73
  74 out_req_buf:
  75         kfree(login->req_buf);
  76 out_login:
  77         kfree(login);
  78         return NULL;
  79 }
  80
  81 /*
  82  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  83  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  84  */
  85 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  86 {
  87         struct crypto_ahash *tfm;
  88
  89         /*
  90          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  91          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  92          * to software 1x8 byte slicing from crc32c.ko
  93          */
  94         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
  95         if (IS_ERR(tfm)) {
  96                 pr_err("crypto_alloc_ahash() failed\n");
  97                 return -ENOMEM;
  98         }
  99
 100         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 101         if (!conn->conn_rx_hash) {
 102                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
 103                 crypto_free_ahash(tfm);
 104                 return -ENOMEM;
 105         }
 106         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
 107
 108         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 109         if (!conn->conn_tx_hash) {
 110                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 111                 ahash_request_free(conn->conn_rx_hash);
 112                 conn->conn_rx_hash = NULL;
 113                 crypto_free_ahash(tfm);
 114                 return -ENOMEM;
 115         }
 116         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 117
 118         return 0;
 119 }
 120
 121 static int iscsi_login_check_initiator_version(
 122         struct iscsi_conn *conn,
 123         u8 version_max,
 124         u8 version_min)
 125 {
 126         if ((version_max != 0x00) || (version_min != 0x00)) {
 127                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 128                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 129                         version_min, version_max);
 130                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 131                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 132                 return -1;
 133         }
 134
 135         return 0;
 136 }
 137
 138 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 139 {
 140         int sessiontype;
 141         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 142         struct iscsi_portal_group *tpg = conn->tpg;
 143         struct iscsi_session *sess = NULL, *sess_p = NULL;
 144         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 145         struct se_session *se_sess, *se_sess_tmp;
 146
 147         initiatorname_param = iscsi_find_param_from_key(
 148                         INITIATORNAME, conn->param_list);
 149         sessiontype_param = iscsi_find_param_from_key(
 150                         SESSIONTYPE, conn->param_list);
 151         if (!initiatorname_param || !sessiontype_param) {
 152                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 153                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 154                 return -1;
 155         }
 156
 157         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 158
 159         spin_lock_bh(&se_tpg->session_lock);
 160         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 161                         sess_list) {
 162
 163                 sess_p = se_sess->fabric_sess_ptr;
 164                 spin_lock(&sess_p->conn_lock);
 165                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 166                     atomic_read(&sess_p->session_logout) ||
 167                     atomic_read(&sess_p->session_close) ||
 168                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 169                         spin_unlock(&sess_p->conn_lock);
 170                         continue;
 171                 }
 172                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 173                    (!strcmp(sess_p->sess_ops->InitiatorName,
 174                             initiatorname_param->value) &&
 175                    (sess_p->sess_ops->SessionType == sessiontype))) {
 176                         atomic_set(&sess_p->session_reinstatement, 1);
 177                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 178                         atomic_set(&sess_p->session_close, 1);
 179                         spin_unlock(&sess_p->conn_lock);
 180                         iscsit_inc_session_usage_count(sess_p);
 181                         iscsit_stop_time2retain_timer(sess_p);
 182                         sess = sess_p;
 183                         break;
 184                 }
 185                 spin_unlock(&sess_p->conn_lock);
 186         }
 187         spin_unlock_bh(&se_tpg->session_lock);
 188         /*
 189          * If the Time2Retain handler has expired, the session is already gone.
 190          */
 191         if (!sess)
 192                 return 0;
 193
 194         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 195                 " performing session reinstatement.\n", (sessiontype) ?
 196                 "Discovery" : "Normal", sess->sid,
 197                 sess->sess_ops->InitiatorName);
 198
 199         spin_lock_bh(&sess->conn_lock);
 200         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 201                 spin_unlock_bh(&sess->conn_lock);
 202                 iscsit_dec_session_usage_count(sess);
 203                 return 0;
 204         }
 205         spin_unlock_bh(&sess->conn_lock);
 206
 207         iscsit_stop_session(sess, 1, 1);
 208         iscsit_dec_session_usage_count(sess);
 209
 210         return 0;
 211 }
 212
 213 static int iscsi_login_set_conn_values(
 214         struct iscsi_session *sess,
 215         struct iscsi_conn *conn,
 216         __be16 cid)
 217 {
 218         int ret;
 219         conn->sess              = sess;
 220         conn->cid               = be16_to_cpu(cid);
 221         /*
 222          * Generate a random Status sequence number (statsn) for the new
 223          * iSCSI connection.
 224          */
 225         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 226         if (unlikely(ret))
 227                 return ret;
 228
 229         mutex_lock(&auth_id_lock);
 230         conn->auth_id           = iscsit_global->auth_id++;
 231         mutex_unlock(&auth_id_lock);
 232         return 0;
 233 }
 234
 235 __printf(2, 3) int iscsi_change_param_sprintf(
 236         struct iscsi_conn *conn,
 237         const char *fmt, ...)
 238 {
 239         va_list args;
 240         unsigned char buf[64];
 241
 242         memset(buf, 0, sizeof buf);
 243
 244         va_start(args, fmt);
 245         vsnprintf(buf, sizeof buf, fmt, args);
 246         va_end(args);
 247
 248         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 249                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 250                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 251                 return -1;
 252         }
 253
 254         return 0;
 255 }
 256 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 257
 258 /*
 259  *      This is the leading connection of a new session,
 260  *      or session reinstatement.
 261  */
 262 static int iscsi_login_zero_tsih_s1(
 263         struct iscsi_conn *conn,
 264         unsigned char *buf)
 265 {
 266         struct iscsi_session *sess = NULL;
 267         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 268         int ret;
 269
 270         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 271         if (!sess) {
 272                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 273                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 274                 pr_err("Could not allocate memory for session\n");
 275                 return -ENOMEM;
 276         }
 277
 278         if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
 279                 goto free_sess;
 280
 281         sess->init_task_tag     = pdu->itt;
 282         memcpy(&sess->isid, pdu->isid, 6);
 283         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 284         INIT_LIST_HEAD(&sess->sess_conn_list);
 285         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 286         INIT_LIST_HEAD(&sess->cr_active_list);
 287         INIT_LIST_HEAD(&sess->cr_inactive_list);
 288         init_completion(&sess->async_msg_comp);
 289         init_completion(&sess->reinstatement_comp);
 290         init_completion(&sess->session_wait_comp);
 291         init_completion(&sess->session_waiting_on_uc_comp);
 292         mutex_init(&sess->cmdsn_mutex);
 293         spin_lock_init(&sess->conn_lock);
 294         spin_lock_init(&sess->cr_a_lock);
 295         spin_lock_init(&sess->cr_i_lock);
 296         spin_lock_init(&sess->session_usage_lock);
 297         spin_lock_init(&sess->ttt_lock);
 298
 299         timer_setup(&sess->time2retain_timer,
 300                     iscsit_handle_time2retain_timeout, 0);
 301
 302         ret = ida_alloc(&sess_ida, GFP_KERNEL);
 303         if (ret < 0) {
 304                 pr_err("Session ID allocation failed %d\n", ret);
 305                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 306                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 307                 goto free_sess;
 308         }
 309
 310         sess->session_index = ret;
 311         sess->creation_time = get_jiffies_64();
 312         /*
 313          * The FFP CmdSN window values will be allocated from the TPG's
 314          * Initiator Node's ACL once the login has been successfully completed.
 315          */
 316         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 317
 318         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 319         if (!sess->sess_ops) {
 320                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 321                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 322                 pr_err("Unable to allocate memory for"
 323                                 " struct iscsi_sess_ops.\n");
 324                 goto free_id;
 325         }
 326
 327         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 328         if (IS_ERR(sess->se_sess)) {
 329                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 330                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 331                 goto free_ops;
 332         }
 333
 334         return 0;
 335
 336 free_ops:
 337         kfree(sess->sess_ops);
 338 free_id:
 339         ida_free(&sess_ida, sess->session_index);
 340 free_sess:
 341         kfree(sess);
 342         conn->sess = NULL;
 343         return -ENOMEM;
 344 }
 345
 346 static int iscsi_login_zero_tsih_s2(
 347         struct iscsi_conn *conn)
 348 {
 349         struct iscsi_node_attrib *na;
 350         struct iscsi_session *sess = conn->sess;
 351         bool iser = false;
 352
 353         sess->tpg = conn->tpg;
 354
 355         /*
 356          * Assign a new TPG Session Handle.  Note this is protected with
 357          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 358          */
 359         sess->tsih = ++sess->tpg->ntsih;
 360         if (!sess->tsih)
 361                 sess->tsih = ++sess->tpg->ntsih;
 362
 363         /*
 364          * Create the default params from user defined values..
 365          */
 366         if (iscsi_copy_param_list(&conn->param_list,
 367                                 conn->tpg->param_list, 1) < 0) {
 368                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 369                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 370                 return -1;
 371         }
 372
 373         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 374                 iser = true;
 375
 376         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 377
 378         if (sess->sess_ops->SessionType)
 379                 return iscsi_set_keys_irrelevant_for_discovery(
 380                                 conn->param_list);
 381
 382         na = iscsit_tpg_get_node_attrib(sess);
 383
 384         /*
 385          * Need to send TargetPortalGroupTag back in first login response
 386          * on any iSCSI connection where the Initiator provides TargetName.
 387          * See 5.3.1.  Login Phase Start
 388          *
 389          * In our case, we have already located the struct iscsi_tiqn at this point.
 390          */
 391         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 392                 return -1;
 393
 394         /*
 395          * Workaround for Initiators that have broken connection recovery logic.
 396          *
 397          * "We would really like to get rid of this." Linux-iSCSI.org team
 398          */
 399         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 400                 return -1;
 401
 402         /*
 403          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 404          */
 405         if (iser) {
 406                 struct iscsi_param *param;
 407                 unsigned long mrdsl, off;
 408                 int rc;
 409
 410                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 411                         return -1;
 412
 413                 /*
 414                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 415                  * Immediate Data + Unsolicited Data-OUT if necessary..
 416                  */
 417                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 418                                                   conn->param_list);
 419                 if (!param) {
 420                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 421                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 422                         return -1;
 423                 }
 424                 rc = kstrtoul(param->value, 0, &mrdsl);
 425                 if (rc < 0) {
 426                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 427                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 428                         return -1;
 429                 }
 430                 off = mrdsl % PAGE_SIZE;
 431                 if (!off)
 432                         goto check_prot;
 433
 434                 if (mrdsl < PAGE_SIZE)
 435                         mrdsl = PAGE_SIZE;
 436                 else
 437                         mrdsl -= off;
 438
 439                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 440                         " to PAGE_SIZE\n", mrdsl);
 441
 442                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 443                         return -1;
 444                 /*
 445                  * ISER currently requires that ImmediateData + Unsolicited
 446                  * Data be disabled when protection / signature MRs are enabled.
 447                  */
 448 check_prot:
 449                 if (sess->se_sess->sup_prot_ops &
 450                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 451                     TARGET_PROT_DOUT_INSERT)) {
 452
 453                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 454                                 return -1;
 455
 456                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 457                                 return -1;
 458
 459                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 460                                  " T10-PI enabled ISER session\n");
 461                 }
 462         }
 463
 464         return 0;
 465 }
 466
 467 static int iscsi_login_non_zero_tsih_s1(
 468         struct iscsi_conn *conn,
 469         unsigned char *buf)
 470 {
 471         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 472
 473         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 474 }
 475
 476 /*
 477  *      Add a new connection to an existing session.
 478  */
 479 static int iscsi_login_non_zero_tsih_s2(
 480         struct iscsi_conn *conn,
 481         unsigned char *buf)
 482 {
 483         struct iscsi_portal_group *tpg = conn->tpg;
 484         struct iscsi_session *sess = NULL, *sess_p = NULL;
 485         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 486         struct se_session *se_sess, *se_sess_tmp;
 487         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 488         bool iser = false;
 489
 490         spin_lock_bh(&se_tpg->session_lock);
 491         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 492                         sess_list) {
 493
 494                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 495                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 496                     atomic_read(&sess_p->session_logout) ||
 497                     atomic_read(&sess_p->session_close) ||
 498                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 499                         continue;
 500                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 501                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 502                         iscsit_inc_session_usage_count(sess_p);
 503                         iscsit_stop_time2retain_timer(sess_p);
 504                         sess = sess_p;
 505                         break;
 506                 }
 507         }
 508         spin_unlock_bh(&se_tpg->session_lock);
 509
 510         /*
 511          * If the Time2Retain handler has expired, the session is already gone.
 512          */
 513         if (!sess) {
 514                 pr_err("Initiator attempting to add a connection to"
 515                         " a non-existent session, rejecting iSCSI Login.\n");
 516                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 517                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 518                 return -1;
 519         }
 520
 521         /*
 522          * Stop the Time2Retain timer if this is a failed session, we restart
 523          * the timer if the login is not successful.
 524          */
 525         spin_lock_bh(&sess->conn_lock);
 526         if (sess->session_state == TARG_SESS_STATE_FAILED)
 527                 atomic_set(&sess->session_continuation, 1);
 528         spin_unlock_bh(&sess->conn_lock);
 529
 530         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 531             iscsi_copy_param_list(&conn->param_list,
 532                         conn->tpg->param_list, 0) < 0) {
 533                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 534                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 535                 return -1;
 536         }
 537
 538         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 539                 iser = true;
 540
 541         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 542         /*
 543          * Need to send TargetPortalGroupTag back in first login response
 544          * on any iSCSI connection where the Initiator provides TargetName.
 545          * See 5.3.1.  Login Phase Start
 546          *
 547          * In our case, we have already located the struct iscsi_tiqn at this point.
 548          */
 549         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 550                 return -1;
 551
 552         return 0;
 553 }
 554
 555 int iscsi_login_post_auth_non_zero_tsih(
 556         struct iscsi_conn *conn,
 557         u16 cid,
 558         u32 exp_statsn)
 559 {
 560         struct iscsi_conn *conn_ptr = NULL;
 561         struct iscsi_conn_recovery *cr = NULL;
 562         struct iscsi_session *sess = conn->sess;
 563
 564         /*
 565          * By following item 5 in the login table,  if we have found
 566          * an existing ISID and a valid/existing TSIH and an existing
 567          * CID we do connection reinstatement.  Currently we dont not
 568          * support it so we send back an non-zero status class to the
 569          * initiator and release the new connection.
 570          */
 571         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 572         if (conn_ptr) {
 573                 pr_err("Connection exists with CID %hu for %s,"
 574                         " performing connection reinstatement.\n",
 575                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 576
 577                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 578                 iscsit_dec_conn_usage_count(conn_ptr);
 579         }
 580
 581         /*
 582          * Check for any connection recovery entires containing CID.
 583          * We use the original ExpStatSN sent in the first login request
 584          * to acknowledge commands for the failed connection.
 585          *
 586          * Also note that an explict logout may have already been sent,
 587          * but the response may not be sent due to additional connection
 588          * loss.
 589          */
 590         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 591                 cr = iscsit_get_inactive_connection_recovery_entry(
 592                                 sess, cid);
 593                 if (cr) {
 594                         pr_debug("Performing implicit logout"
 595                                 " for connection recovery on CID: %hu\n",
 596                                         conn->cid);
 597                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 598                 }
 599         }
 600
 601         /*
 602          * Else we follow item 4 from the login table in that we have
 603          * found an existing ISID and a valid/existing TSIH and a new
 604          * CID we go ahead and continue to add a new connection to the
 605          * session.
 606          */
 607         pr_debug("Adding CID %hu to existing session for %s.\n",
 608                         cid, sess->sess_ops->InitiatorName);
 609
 610         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 611                 pr_err("Adding additional connection to this session"
 612                         " would exceed MaxConnections %d, login failed.\n",
 613                                 sess->sess_ops->MaxConnections);
 614                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 615                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 616                 return -1;
 617         }
 618
 619         return 0;
 620 }
 621
 622 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 623 {
 624         struct iscsi_session *sess = conn->sess;
 625         /*
 626          * FIXME: Unsolicited NopIN support for ISER
 627          */
 628         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 629                 return;
 630
 631         if (!sess->sess_ops->SessionType)
 632                 iscsit_start_nopin_timer(conn);
 633 }
 634
 635 int iscsit_start_kthreads(struct iscsi_conn *conn)
 636 {
 637         int ret = 0;
 638
 639         spin_lock(&iscsit_global->ts_bitmap_lock);
 640         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 641                                         ISCSIT_BITMAP_BITS, get_order(1));
 642         spin_unlock(&iscsit_global->ts_bitmap_lock);
 643
 644         if (conn->bitmap_id < 0) {
 645                 pr_err("bitmap_find_free_region() failed for"
 646                        " iscsit_start_kthreads()\n");
 647                 return -ENOMEM;
 648         }
 649
 650         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 651                                       "%s", ISCSI_TX_THREAD_NAME);
 652         if (IS_ERR(conn->tx_thread)) {
 653                 pr_err("Unable to start iscsi_target_tx_thread\n");
 654                 ret = PTR_ERR(conn->tx_thread);
 655                 goto out_bitmap;
 656         }
 657         conn->tx_thread_active = true;
 658
 659         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 660                                       "%s", ISCSI_RX_THREAD_NAME);
 661         if (IS_ERR(conn->rx_thread)) {
 662                 pr_err("Unable to start iscsi_target_rx_thread\n");
 663                 ret = PTR_ERR(conn->rx_thread);
 664                 goto out_tx;
 665         }
 666         conn->rx_thread_active = true;
 667
 668         return 0;
 669 out_tx:
 670         send_sig(SIGINT, conn->tx_thread, 1);
 671         kthread_stop(conn->tx_thread);
 672         conn->tx_thread_active = false;
 673 out_bitmap:
 674         spin_lock(&iscsit_global->ts_bitmap_lock);
 675         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 676                               get_order(1));
 677         spin_unlock(&iscsit_global->ts_bitmap_lock);
 678         return ret;
 679 }
 680
 681 void iscsi_post_login_handler(
 682         struct iscsi_np *np,
 683         struct iscsi_conn *conn,
 684         u8 zero_tsih)
 685 {
 686         int stop_timer = 0;
 687         struct iscsi_session *sess = conn->sess;
 688         struct se_session *se_sess = sess->se_sess;
 689         struct iscsi_portal_group *tpg = sess->tpg;
 690         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 691
 692         iscsit_inc_conn_usage_count(conn);
 693
 694         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 695                         ISCSI_LOGIN_STATUS_ACCEPT);
 696
 697         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 698         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 699
 700         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 701         /*
 702          * SCSI Initiator -> SCSI Target Port Mapping
 703          */
 704         if (!zero_tsih) {
 705                 iscsi_set_session_parameters(sess->sess_ops,
 706                                 conn->param_list, 0);
 707                 iscsi_release_param_list(conn->param_list);
 708                 conn->param_list = NULL;
 709
 710                 spin_lock_bh(&sess->conn_lock);
 711                 atomic_set(&sess->session_continuation, 0);
 712                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 713                         pr_debug("Moving to"
 714                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 715                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 716                         stop_timer = 1;
 717                 }
 718
 719                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 720                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 721                         &conn->local_sockaddr, tpg->tpgt);
 722
 723                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 724                 atomic_inc(&sess->nconn);
 725                 pr_debug("Incremented iSCSI Connection count to %hu"
 726                         " from node: %s\n", atomic_read(&sess->nconn),
 727                         sess->sess_ops->InitiatorName);
 728                 spin_unlock_bh(&sess->conn_lock);
 729
 730                 iscsi_post_login_start_timers(conn);
 731                 /*
 732                  * Determine CPU mask to ensure connection's RX and TX kthreads
 733                  * are scheduled on the same CPU.
 734                  */
 735                 iscsit_thread_get_cpumask(conn);
 736                 conn->conn_rx_reset_cpumask = 1;
 737                 conn->conn_tx_reset_cpumask = 1;
 738                 /*
 739                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 740                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 741                  */
 742                 complete(&conn->rx_login_comp);
 743                 iscsit_dec_conn_usage_count(conn);
 744
 745                 if (stop_timer) {
 746                         spin_lock_bh(&se_tpg->session_lock);
 747                         iscsit_stop_time2retain_timer(sess);
 748                         spin_unlock_bh(&se_tpg->session_lock);
 749                 }
 750                 iscsit_dec_session_usage_count(sess);
 751                 return;
 752         }
 753
 754         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 755         iscsi_release_param_list(conn->param_list);
 756         conn->param_list = NULL;
 757
 758         iscsit_determine_maxcmdsn(sess);
 759
 760         spin_lock_bh(&se_tpg->session_lock);
 761         __transport_register_session(&sess->tpg->tpg_se_tpg,
 762                         se_sess->se_node_acl, se_sess, sess);
 763         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 764         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 765
 766         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 767                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 768                 tpg->tpgt);
 769
 770         spin_lock_bh(&sess->conn_lock);
 771         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 772         atomic_inc(&sess->nconn);
 773         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 774                 " %s\n", atomic_read(&sess->nconn),
 775                 sess->sess_ops->InitiatorName);
 776         spin_unlock_bh(&sess->conn_lock);
 777
 778         sess->sid = tpg->sid++;
 779         if (!sess->sid)
 780                 sess->sid = tpg->sid++;
 781         pr_debug("Established iSCSI session from node: %s\n",
 782                         sess->sess_ops->InitiatorName);
 783
 784         tpg->nsessions++;
 785         if (tpg->tpg_tiqn)
 786                 tpg->tpg_tiqn->tiqn_nsessions++;
 787
 788         pr_debug("Incremented number of active iSCSI sessions to %u on"
 789                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 790         spin_unlock_bh(&se_tpg->session_lock);
 791
 792         iscsi_post_login_start_timers(conn);
 793         /*
 794          * Determine CPU mask to ensure connection's RX and TX kthreads
 795          * are scheduled on the same CPU.
 796          */
 797         iscsit_thread_get_cpumask(conn);
 798         conn->conn_rx_reset_cpumask = 1;
 799         conn->conn_tx_reset_cpumask = 1;
 800         /*
 801          * Wakeup the sleeping iscsi_target_rx_thread() now that
 802          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 803          */
 804         complete(&conn->rx_login_comp);
 805         iscsit_dec_conn_usage_count(conn);
 806 }
 807
 808 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 809 {
 810         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 811
 812         spin_lock_bh(&np->np_thread_lock);
 813         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 814                         &np->np_sockaddr);
 815
 816         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 817                 spin_unlock_bh(&np->np_thread_lock);
 818                 return;
 819         }
 820
 821         if (np->np_thread)
 822                 send_sig(SIGINT, np->np_thread, 1);
 823
 824         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 825         spin_unlock_bh(&np->np_thread_lock);
 826 }
 827
 828 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 829 {
 830         /*
 831          * This used the TA_LOGIN_TIMEOUT constant because at this
 832          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 833          */
 834         spin_lock_bh(&np->np_thread_lock);
 835         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 836         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 837         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 838
 839         pr_debug("Added timeout timer to iSCSI login request for"
 840                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 841         spin_unlock_bh(&np->np_thread_lock);
 842 }
 843
 844 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 845 {
 846         spin_lock_bh(&np->np_thread_lock);
 847         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 848                 spin_unlock_bh(&np->np_thread_lock);
 849                 return;
 850         }
 851         np->np_login_timer_flags |= ISCSI_TF_STOP;
 852         spin_unlock_bh(&np->np_thread_lock);
 853
 854         del_timer_sync(&np->np_login_timer);
 855
 856         spin_lock_bh(&np->np_thread_lock);
 857         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 858         spin_unlock_bh(&np->np_thread_lock);
 859 }
 860
 861 int iscsit_setup_np(
 862         struct iscsi_np *np,
 863         struct sockaddr_storage *sockaddr)
 864 {
 865         struct socket *sock = NULL;
 866         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 867
 868         switch (np->np_network_transport) {
 869         case ISCSI_TCP:
 870                 np->np_ip_proto = IPPROTO_TCP;
 871                 np->np_sock_type = SOCK_STREAM;
 872                 break;
 873         case ISCSI_SCTP_TCP:
 874                 np->np_ip_proto = IPPROTO_SCTP;
 875                 np->np_sock_type = SOCK_STREAM;
 876                 break;
 877         case ISCSI_SCTP_UDP:
 878                 np->np_ip_proto = IPPROTO_SCTP;
 879                 np->np_sock_type = SOCK_SEQPACKET;
 880                 break;
 881         default:
 882                 pr_err("Unsupported network_transport: %d\n",
 883                                 np->np_network_transport);
 884                 return -EINVAL;
 885         }
 886
 887         np->np_ip_proto = IPPROTO_TCP;
 888         np->np_sock_type = SOCK_STREAM;
 889
 890         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 891                         np->np_ip_proto, &sock);
 892         if (ret < 0) {
 893                 pr_err("sock_create() failed.\n");
 894                 return ret;
 895         }
 896         np->np_socket = sock;
 897         /*
 898          * Setup the np->np_sockaddr from the passed sockaddr setup
 899          * in iscsi_target_configfs.c code..
 900          */
 901         memcpy(&np->np_sockaddr, sockaddr,
 902                         sizeof(struct sockaddr_storage));
 903
 904         if (sockaddr->ss_family == AF_INET6)
 905                 len = sizeof(struct sockaddr_in6);
 906         else
 907                 len = sizeof(struct sockaddr_in);
 908         /*
 909          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 910          */
 911         /* FIXME: Someone please explain why this is endian-safe */
 912         opt = 1;
 913         if (np->np_network_transport == ISCSI_TCP) {
 914                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 915                                 (char *)&opt, sizeof(opt));
 916                 if (ret < 0) {
 917                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 918                                 " failed: %d\n", ret);
 919                         goto fail;
 920                 }
 921         }
 922
 923         /* FIXME: Someone please explain why this is endian-safe */
 924         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 925                         (char *)&opt, sizeof(opt));
 926         if (ret < 0) {
 927                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 928                         " failed\n");
 929                 goto fail;
 930         }
 931
 932         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 933                         (char *)&opt, sizeof(opt));
 934         if (ret < 0) {
 935                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 936                         " failed\n");
 937                 goto fail;
 938         }
 939
 940         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 941         if (ret < 0) {
 942                 pr_err("kernel_bind() failed: %d\n", ret);
 943                 goto fail;
 944         }
 945
 946         ret = kernel_listen(sock, backlog);
 947         if (ret != 0) {
 948                 pr_err("kernel_listen() failed: %d\n", ret);
 949                 goto fail;
 950         }
 951
 952         return 0;
 953 fail:
 954         np->np_socket = NULL;
 955         sock_release(sock);
 956         return ret;
 957 }
 958
 959 int iscsi_target_setup_login_socket(
 960         struct iscsi_np *np,
 961         struct sockaddr_storage *sockaddr)
 962 {
 963         struct iscsit_transport *t;
 964         int rc;
 965
 966         t = iscsit_get_transport(np->np_network_transport);
 967         if (!t)
 968                 return -EINVAL;
 969
 970         rc = t->iscsit_setup_np(np, sockaddr);
 971         if (rc < 0) {
 972                 iscsit_put_transport(t);
 973                 return rc;
 974         }
 975
 976         np->np_transport = t;
 977         np->enabled = true;
 978         return 0;
 979 }
 980
 981 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 982 {
 983         struct socket *new_sock, *sock = np->np_socket;
 984         struct sockaddr_in sock_in;
 985         struct sockaddr_in6 sock_in6;
 986         int rc;
 987
 988         rc = kernel_accept(sock, &new_sock, 0);
 989         if (rc < 0)
 990                 return rc;
 991
 992         conn->sock = new_sock;
 993         conn->login_family = np->np_sockaddr.ss_family;
 994
 995         if (np->np_sockaddr.ss_family == AF_INET6) {
 996                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 997
 998                 rc = conn->sock->ops->getname(conn->sock,
 999                                 (struct sockaddr *)&sock_in6, 1);
1000                 if (rc >= 0) {
1001                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1002                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1003                         } else {
1004                                 /* Pretend to be an ipv4 socket */
1005                                 sock_in.sin_family = AF_INET;
1006                                 sock_in.sin_port = sock_in6.sin6_port;
1007                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1008                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1009                         }
1010                 }
1011
1012                 rc = conn->sock->ops->getname(conn->sock,
1013                                 (struct sockaddr *)&sock_in6, 0);
1014                 if (rc >= 0) {
1015                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1016                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1017                         } else {
1018                                 /* Pretend to be an ipv4 socket */
1019                                 sock_in.sin_family = AF_INET;
1020                                 sock_in.sin_port = sock_in6.sin6_port;
1021                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1022                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1023                         }
1024                 }
1025         } else {
1026                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1027
1028                 rc = conn->sock->ops->getname(conn->sock,
1029                                 (struct sockaddr *)&sock_in, 1);
1030                 if (rc >= 0)
1031                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1032
1033                 rc = conn->sock->ops->getname(conn->sock,
1034                                 (struct sockaddr *)&sock_in, 0);
1035                 if (rc >= 0)
1036                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1037         }
1038
1039         return 0;
1040 }
1041
1042 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1043 {
1044         struct iscsi_login_req *login_req;
1045         u32 padding = 0, payload_length;
1046
1047         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1048                 return -1;
1049
1050         login_req = (struct iscsi_login_req *)login->req;
1051         payload_length  = ntoh24(login_req->dlength);
1052         padding = ((-payload_length) & 3);
1053
1054         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1055                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1056                 login_req->flags, login_req->itt, login_req->cmdsn,
1057                 login_req->exp_statsn, login_req->cid, payload_length);
1058         /*
1059          * Setup the initial iscsi_login values from the leading
1060          * login request PDU.
1061          */
1062         if (login->first_request) {
1063                 login_req = (struct iscsi_login_req *)login->req;
1064                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1065                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1066                 login->version_min      = login_req->min_version;
1067                 login->version_max      = login_req->max_version;
1068                 memcpy(login->isid, login_req->isid, 6);
1069                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1070                 login->init_task_tag    = login_req->itt;
1071                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1072                 login->cid              = be16_to_cpu(login_req->cid);
1073                 login->tsih             = be16_to_cpu(login_req->tsih);
1074         }
1075
1076         if (iscsi_target_check_login_request(conn, login) < 0)
1077                 return -1;
1078
1079         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1080         if (iscsi_login_rx_data(conn, login->req_buf,
1081                                 payload_length + padding) < 0)
1082                 return -1;
1083
1084         return 0;
1085 }
1086
1087 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1088                         u32 length)
1089 {
1090         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1091                 return -1;
1092
1093         return 0;
1094 }
1095
1096 static int
1097 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1098 {
1099         int rc;
1100
1101         if (!t->owner) {
1102                 conn->conn_transport = t;
1103                 return 0;
1104         }
1105
1106         rc = try_module_get(t->owner);
1107         if (!rc) {
1108                 pr_err("try_module_get() failed for %s\n", t->name);
1109                 return -EINVAL;
1110         }
1111
1112         conn->conn_transport = t;
1113         return 0;
1114 }
1115
1116 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1117 {
1118         struct iscsi_conn *conn;
1119
1120         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1121         if (!conn) {
1122                 pr_err("Could not allocate memory for new connection\n");
1123                 return NULL;
1124         }
1125         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1126         conn->conn_state = TARG_CONN_STATE_FREE;
1127
1128         init_waitqueue_head(&conn->queues_wq);
1129         INIT_LIST_HEAD(&conn->conn_list);
1130         INIT_LIST_HEAD(&conn->conn_cmd_list);
1131         INIT_LIST_HEAD(&conn->immed_queue_list);
1132         INIT_LIST_HEAD(&conn->response_queue_list);
1133         init_completion(&conn->conn_post_wait_comp);
1134         init_completion(&conn->conn_wait_comp);
1135         init_completion(&conn->conn_wait_rcfr_comp);
1136         init_completion(&conn->conn_waiting_on_uc_comp);
1137         init_completion(&conn->conn_logout_comp);
1138         init_completion(&conn->rx_half_close_comp);
1139         init_completion(&conn->tx_half_close_comp);
1140         init_completion(&conn->rx_login_comp);
1141         spin_lock_init(&conn->cmd_lock);
1142         spin_lock_init(&conn->conn_usage_lock);
1143         spin_lock_init(&conn->immed_queue_lock);
1144         spin_lock_init(&conn->nopin_timer_lock);
1145         spin_lock_init(&conn->response_queue_lock);
1146         spin_lock_init(&conn->state_lock);
1147
1148         timer_setup(&conn->nopin_response_timer,
1149                     iscsit_handle_nopin_response_timeout, 0);
1150         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1151
1152         if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1153                 goto free_conn;
1154
1155         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1156         if (!conn->conn_ops) {
1157                 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1158                 goto put_transport;
1159         }
1160
1161         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1162                 pr_err("Unable to allocate conn->conn_cpumask\n");
1163                 goto free_mask;
1164         }
1165
1166         return conn;
1167
1168 free_mask:
1169         free_cpumask_var(conn->conn_cpumask);
1170 put_transport:
1171         iscsit_put_transport(conn->conn_transport);
1172 free_conn:
1173         kfree(conn);
1174         return NULL;
1175 }
1176
1177 void iscsit_free_conn(struct iscsi_conn *conn)
1178 {
1179         free_cpumask_var(conn->conn_cpumask);
1180         kfree(conn->conn_ops);
1181         iscsit_put_transport(conn->conn_transport);
1182         kfree(conn);
1183 }
1184
1185 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1186                                  bool zero_tsih, bool new_sess)
1187 {
1188         if (!new_sess)
1189                 goto old_sess_out;
1190
1191         pr_err("iSCSI Login negotiation failed.\n");
1192         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1193                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1194         if (!zero_tsih || !conn->sess)
1195                 goto old_sess_out;
1196
1197         transport_free_session(conn->sess->se_sess);
1198         ida_free(&sess_ida, conn->sess->session_index);
1199         kfree(conn->sess->sess_ops);
1200         kfree(conn->sess);
1201         conn->sess = NULL;
1202
1203 old_sess_out:
1204         /*
1205          * If login negotiation fails check if the Time2Retain timer
1206          * needs to be restarted.
1207          */
1208         if (!zero_tsih && conn->sess) {
1209                 spin_lock_bh(&conn->sess->conn_lock);
1210                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1211                         struct se_portal_group *se_tpg =
1212                                         &conn->tpg->tpg_se_tpg;
1213
1214                         atomic_set(&conn->sess->session_continuation, 0);
1215                         spin_unlock_bh(&conn->sess->conn_lock);
1216                         spin_lock_bh(&se_tpg->session_lock);
1217                         iscsit_start_time2retain_handler(conn->sess);
1218                         spin_unlock_bh(&se_tpg->session_lock);
1219                 } else
1220                         spin_unlock_bh(&conn->sess->conn_lock);
1221                 iscsit_dec_session_usage_count(conn->sess);
1222         }
1223
1224         ahash_request_free(conn->conn_tx_hash);
1225         if (conn->conn_rx_hash) {
1226                 struct crypto_ahash *tfm;
1227
1228                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1229                 ahash_request_free(conn->conn_rx_hash);
1230                 crypto_free_ahash(tfm);
1231         }
1232
1233         if (conn->param_list) {
1234                 iscsi_release_param_list(conn->param_list);
1235                 conn->param_list = NULL;
1236         }
1237         iscsi_target_nego_release(conn);
1238
1239         if (conn->sock) {
1240                 sock_release(conn->sock);
1241                 conn->sock = NULL;
1242         }
1243
1244         if (conn->conn_transport->iscsit_wait_conn)
1245                 conn->conn_transport->iscsit_wait_conn(conn);
1246
1247         if (conn->conn_transport->iscsit_free_conn)
1248                 conn->conn_transport->iscsit_free_conn(conn);
1249
1250         iscsit_free_conn(conn);
1251 }
1252
1253 static int __iscsi_target_login_thread(struct iscsi_np *np)
1254 {
1255         u8 *buffer, zero_tsih = 0;
1256         int ret = 0, rc;
1257         struct iscsi_conn *conn = NULL;
1258         struct iscsi_login *login;
1259         struct iscsi_portal_group *tpg = NULL;
1260         struct iscsi_login_req *pdu;
1261         struct iscsi_tpg_np *tpg_np;
1262         bool new_sess = false;
1263
1264         flush_signals(current);
1265
1266         spin_lock_bh(&np->np_thread_lock);
1267         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1268                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1269                 spin_unlock_bh(&np->np_thread_lock);
1270                 complete(&np->np_restart_comp);
1271                 return 1;
1272         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1273                 spin_unlock_bh(&np->np_thread_lock);
1274                 goto exit;
1275         } else {
1276                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1277         }
1278         spin_unlock_bh(&np->np_thread_lock);
1279
1280         conn = iscsit_alloc_conn(np);
1281         if (!conn) {
1282                 /* Get another socket */
1283                 return 1;
1284         }
1285
1286         rc = np->np_transport->iscsit_accept_np(np, conn);
1287         if (rc == -ENOSYS) {
1288                 complete(&np->np_restart_comp);
1289                 iscsit_free_conn(conn);
1290                 goto exit;
1291         } else if (rc < 0) {
1292                 spin_lock_bh(&np->np_thread_lock);
1293                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1294                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1295                         spin_unlock_bh(&np->np_thread_lock);
1296                         complete(&np->np_restart_comp);
1297                         iscsit_free_conn(conn);
1298                         /* Get another socket */
1299                         return 1;
1300                 }
1301                 spin_unlock_bh(&np->np_thread_lock);
1302                 iscsit_free_conn(conn);
1303                 return 1;
1304         }
1305         /*
1306          * Perform the remaining iSCSI connection initialization items..
1307          */
1308         login = iscsi_login_init_conn(conn);
1309         if (!login) {
1310                 goto new_sess_out;
1311         }
1312
1313         iscsi_start_login_thread_timer(np);
1314
1315         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1316         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1317         /*
1318          * This will process the first login request + payload..
1319          */
1320         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1321         if (rc == 1)
1322                 return 1;
1323         else if (rc < 0)
1324                 goto new_sess_out;
1325
1326         buffer = &login->req[0];
1327         pdu = (struct iscsi_login_req *)buffer;
1328         /*
1329          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1330          * when Status-Class != 0.
1331         */
1332         conn->login_itt = pdu->itt;
1333
1334         spin_lock_bh(&np->np_thread_lock);
1335         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1336                 spin_unlock_bh(&np->np_thread_lock);
1337                 pr_err("iSCSI Network Portal on %pISpc currently not"
1338                         " active.\n", &np->np_sockaddr);
1339                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1340                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1341                 goto new_sess_out;
1342         }
1343         spin_unlock_bh(&np->np_thread_lock);
1344
1345         conn->network_transport = np->np_network_transport;
1346
1347         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1348                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1349                 &conn->local_sockaddr);
1350
1351         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1352         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1353
1354         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1355                         pdu->min_version) < 0)
1356                 goto new_sess_out;
1357
1358         zero_tsih = (pdu->tsih == 0x0000);
1359         if (zero_tsih) {
1360                 /*
1361                  * This is the leading connection of a new session.
1362                  * We wait until after authentication to check for
1363                  * session reinstatement.
1364                  */
1365                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1366                         goto new_sess_out;
1367         } else {
1368                 /*
1369                  * Add a new connection to an existing session.
1370                  * We check for a non-existant session in
1371                  * iscsi_login_non_zero_tsih_s2() below based
1372                  * on ISID/TSIH, but wait until after authentication
1373                  * to check for connection reinstatement, etc.
1374                  */
1375                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1376                         goto new_sess_out;
1377         }
1378         /*
1379          * SessionType: Discovery
1380          *
1381          *      Locates Default Portal
1382          *
1383          * SessionType: Normal
1384          *
1385          *      Locates Target Portal from NP -> Target IQN
1386          */
1387         rc = iscsi_target_locate_portal(np, conn, login);
1388         if (rc < 0) {
1389                 tpg = conn->tpg;
1390                 goto new_sess_out;
1391         }
1392         login->zero_tsih = zero_tsih;
1393
1394         if (conn->sess)
1395                 conn->sess->se_sess->sup_prot_ops =
1396                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1397
1398         tpg = conn->tpg;
1399         if (!tpg) {
1400                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1401                 goto new_sess_out;
1402         }
1403
1404         if (zero_tsih) {
1405                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1406                         goto new_sess_out;
1407         } else {
1408                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1409                         goto old_sess_out;
1410         }
1411
1412         if (conn->conn_transport->iscsit_validate_params) {
1413                 ret = conn->conn_transport->iscsit_validate_params(conn);
1414                 if (ret < 0) {
1415                         if (zero_tsih)
1416                                 goto new_sess_out;
1417                         else
1418                                 goto old_sess_out;
1419                 }
1420         }
1421
1422         ret = iscsi_target_start_negotiation(login, conn);
1423         if (ret < 0)
1424                 goto new_sess_out;
1425
1426         iscsi_stop_login_thread_timer(np);
1427
1428         if (ret == 1) {
1429                 tpg_np = conn->tpg_np;
1430
1431                 iscsi_post_login_handler(np, conn, zero_tsih);
1432                 iscsit_deaccess_np(np, tpg, tpg_np);
1433         }
1434
1435         tpg = NULL;
1436         tpg_np = NULL;
1437         /* Get another socket */
1438         return 1;
1439
1440 new_sess_out:
1441         new_sess = true;
1442 old_sess_out:
1443         iscsi_stop_login_thread_timer(np);
1444         tpg_np = conn->tpg_np;
1445         iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1446         new_sess = false;
1447
1448         if (tpg) {
1449                 iscsit_deaccess_np(np, tpg, tpg_np);
1450                 tpg = NULL;
1451                 tpg_np = NULL;
1452         }
1453
1454         return 1;
1455
1456 exit:
1457         iscsi_stop_login_thread_timer(np);
1458         spin_lock_bh(&np->np_thread_lock);
1459         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1460         spin_unlock_bh(&np->np_thread_lock);
1461
1462         return 0;
1463 }
1464
1465 int iscsi_target_login_thread(void *arg)
1466 {
1467         struct iscsi_np *np = arg;
1468         int ret;
1469
1470         allow_signal(SIGINT);
1471
1472         while (1) {
1473                 ret = __iscsi_target_login_thread(np);
1474                 /*
1475                  * We break and exit here unless another sock_accept() call
1476                  * is expected.
1477                  */
1478                 if (ret != 1)
1479                         break;
1480         }
1481
1482         while (!kthread_should_stop()) {
1483                 msleep(100);
1484         }
1485
1486         return 0;
1487 }