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                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 168                         spin_unlock(&sess_p->conn_lock);
 169                         continue;
 170                 }
 171                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 172                    (!strcmp(sess_p->sess_ops->InitiatorName,
 173                             initiatorname_param->value) &&
 174                    (sess_p->sess_ops->SessionType == sessiontype))) {
 175                         atomic_set(&sess_p->session_reinstatement, 1);
 176                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 177                         spin_unlock(&sess_p->conn_lock);
 178                         iscsit_inc_session_usage_count(sess_p);
 179                         iscsit_stop_time2retain_timer(sess_p);
 180                         sess = sess_p;
 181                         break;
 182                 }
 183                 spin_unlock(&sess_p->conn_lock);
 184         }
 185         spin_unlock_bh(&se_tpg->session_lock);
 186         /*
 187          * If the Time2Retain handler has expired, the session is already gone.
 188          */
 189         if (!sess)
 190                 return 0;
 191
 192         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 193                 " performing session reinstatement.\n", (sessiontype) ?
 194                 "Discovery" : "Normal", sess->sid,
 195                 sess->sess_ops->InitiatorName);
 196
 197         spin_lock_bh(&sess->conn_lock);
 198         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 199                 spin_unlock_bh(&sess->conn_lock);
 200                 iscsit_dec_session_usage_count(sess);
 201                 iscsit_close_session(sess);
 202                 return 0;
 203         }
 204         spin_unlock_bh(&sess->conn_lock);
 205
 206         iscsit_stop_session(sess, 1, 1);
 207         iscsit_dec_session_usage_count(sess);
 208
 209         iscsit_close_session(sess);
 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                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 498                         continue;
 499                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 500                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 501                         iscsit_inc_session_usage_count(sess_p);
 502                         iscsit_stop_time2retain_timer(sess_p);
 503                         sess = sess_p;
 504                         break;
 505                 }
 506         }
 507         spin_unlock_bh(&se_tpg->session_lock);
 508
 509         /*
 510          * If the Time2Retain handler has expired, the session is already gone.
 511          */
 512         if (!sess) {
 513                 pr_err("Initiator attempting to add a connection to"
 514                         " a non-existent session, rejecting iSCSI Login.\n");
 515                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 516                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 517                 return -1;
 518         }
 519
 520         /*
 521          * Stop the Time2Retain timer if this is a failed session, we restart
 522          * the timer if the login is not successful.
 523          */
 524         spin_lock_bh(&sess->conn_lock);
 525         if (sess->session_state == TARG_SESS_STATE_FAILED)
 526                 atomic_set(&sess->session_continuation, 1);
 527         spin_unlock_bh(&sess->conn_lock);
 528
 529         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 530             iscsi_copy_param_list(&conn->param_list,
 531                         conn->tpg->param_list, 0) < 0) {
 532                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 533                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 534                 return -1;
 535         }
 536
 537         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 538                 iser = true;
 539
 540         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 541         /*
 542          * Need to send TargetPortalGroupTag back in first login response
 543          * on any iSCSI connection where the Initiator provides TargetName.
 544          * See 5.3.1.  Login Phase Start
 545          *
 546          * In our case, we have already located the struct iscsi_tiqn at this point.
 547          */
 548         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 549                 return -1;
 550
 551         return 0;
 552 }
 553
 554 int iscsi_login_post_auth_non_zero_tsih(
 555         struct iscsi_conn *conn,
 556         u16 cid,
 557         u32 exp_statsn)
 558 {
 559         struct iscsi_conn *conn_ptr = NULL;
 560         struct iscsi_conn_recovery *cr = NULL;
 561         struct iscsi_session *sess = conn->sess;
 562
 563         /*
 564          * By following item 5 in the login table,  if we have found
 565          * an existing ISID and a valid/existing TSIH and an existing
 566          * CID we do connection reinstatement.  Currently we dont not
 567          * support it so we send back an non-zero status class to the
 568          * initiator and release the new connection.
 569          */
 570         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 571         if (conn_ptr) {
 572                 pr_err("Connection exists with CID %hu for %s,"
 573                         " performing connection reinstatement.\n",
 574                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 575
 576                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 577                 iscsit_dec_conn_usage_count(conn_ptr);
 578         }
 579
 580         /*
 581          * Check for any connection recovery entires containing CID.
 582          * We use the original ExpStatSN sent in the first login request
 583          * to acknowledge commands for the failed connection.
 584          *
 585          * Also note that an explict logout may have already been sent,
 586          * but the response may not be sent due to additional connection
 587          * loss.
 588          */
 589         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 590                 cr = iscsit_get_inactive_connection_recovery_entry(
 591                                 sess, cid);
 592                 if (cr) {
 593                         pr_debug("Performing implicit logout"
 594                                 " for connection recovery on CID: %hu\n",
 595                                         conn->cid);
 596                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 597                 }
 598         }
 599
 600         /*
 601          * Else we follow item 4 from the login table in that we have
 602          * found an existing ISID and a valid/existing TSIH and a new
 603          * CID we go ahead and continue to add a new connection to the
 604          * session.
 605          */
 606         pr_debug("Adding CID %hu to existing session for %s.\n",
 607                         cid, sess->sess_ops->InitiatorName);
 608
 609         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 610                 pr_err("Adding additional connection to this session"
 611                         " would exceed MaxConnections %d, login failed.\n",
 612                                 sess->sess_ops->MaxConnections);
 613                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 614                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 615                 return -1;
 616         }
 617
 618         return 0;
 619 }
 620
 621 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 622 {
 623         struct iscsi_session *sess = conn->sess;
 624         /*
 625          * FIXME: Unsolicited NopIN support for ISER
 626          */
 627         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 628                 return;
 629
 630         if (!sess->sess_ops->SessionType)
 631                 iscsit_start_nopin_timer(conn);
 632 }
 633
 634 int iscsit_start_kthreads(struct iscsi_conn *conn)
 635 {
 636         int ret = 0;
 637
 638         spin_lock(&iscsit_global->ts_bitmap_lock);
 639         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 640                                         ISCSIT_BITMAP_BITS, get_order(1));
 641         spin_unlock(&iscsit_global->ts_bitmap_lock);
 642
 643         if (conn->bitmap_id < 0) {
 644                 pr_err("bitmap_find_free_region() failed for"
 645                        " iscsit_start_kthreads()\n");
 646                 return -ENOMEM;
 647         }
 648
 649         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 650                                       "%s", ISCSI_TX_THREAD_NAME);
 651         if (IS_ERR(conn->tx_thread)) {
 652                 pr_err("Unable to start iscsi_target_tx_thread\n");
 653                 ret = PTR_ERR(conn->tx_thread);
 654                 goto out_bitmap;
 655         }
 656         conn->tx_thread_active = true;
 657
 658         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 659                                       "%s", ISCSI_RX_THREAD_NAME);
 660         if (IS_ERR(conn->rx_thread)) {
 661                 pr_err("Unable to start iscsi_target_rx_thread\n");
 662                 ret = PTR_ERR(conn->rx_thread);
 663                 goto out_tx;
 664         }
 665         conn->rx_thread_active = true;
 666
 667         return 0;
 668 out_tx:
 669         send_sig(SIGINT, conn->tx_thread, 1);
 670         kthread_stop(conn->tx_thread);
 671         conn->tx_thread_active = false;
 672 out_bitmap:
 673         spin_lock(&iscsit_global->ts_bitmap_lock);
 674         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 675                               get_order(1));
 676         spin_unlock(&iscsit_global->ts_bitmap_lock);
 677         return ret;
 678 }
 679
 680 void iscsi_post_login_handler(
 681         struct iscsi_np *np,
 682         struct iscsi_conn *conn,
 683         u8 zero_tsih)
 684 {
 685         int stop_timer = 0;
 686         struct iscsi_session *sess = conn->sess;
 687         struct se_session *se_sess = sess->se_sess;
 688         struct iscsi_portal_group *tpg = sess->tpg;
 689         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 690
 691         iscsit_inc_conn_usage_count(conn);
 692
 693         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 694                         ISCSI_LOGIN_STATUS_ACCEPT);
 695
 696         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 697         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 698
 699         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 700         /*
 701          * SCSI Initiator -> SCSI Target Port Mapping
 702          */
 703         if (!zero_tsih) {
 704                 iscsi_set_session_parameters(sess->sess_ops,
 705                                 conn->param_list, 0);
 706                 iscsi_release_param_list(conn->param_list);
 707                 conn->param_list = NULL;
 708
 709                 spin_lock_bh(&sess->conn_lock);
 710                 atomic_set(&sess->session_continuation, 0);
 711                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 712                         pr_debug("Moving to"
 713                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 714                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 715                         stop_timer = 1;
 716                 }
 717
 718                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 719                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 720                         &conn->local_sockaddr, tpg->tpgt);
 721
 722                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 723                 atomic_inc(&sess->nconn);
 724                 pr_debug("Incremented iSCSI Connection count to %hu"
 725                         " from node: %s\n", atomic_read(&sess->nconn),
 726                         sess->sess_ops->InitiatorName);
 727                 spin_unlock_bh(&sess->conn_lock);
 728
 729                 iscsi_post_login_start_timers(conn);
 730                 /*
 731                  * Determine CPU mask to ensure connection's RX and TX kthreads
 732                  * are scheduled on the same CPU.
 733                  */
 734                 iscsit_thread_get_cpumask(conn);
 735                 conn->conn_rx_reset_cpumask = 1;
 736                 conn->conn_tx_reset_cpumask = 1;
 737                 /*
 738                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 739                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 740                  */
 741                 complete(&conn->rx_login_comp);
 742                 iscsit_dec_conn_usage_count(conn);
 743
 744                 if (stop_timer) {
 745                         spin_lock_bh(&se_tpg->session_lock);
 746                         iscsit_stop_time2retain_timer(sess);
 747                         spin_unlock_bh(&se_tpg->session_lock);
 748                 }
 749                 iscsit_dec_session_usage_count(sess);
 750                 return;
 751         }
 752
 753         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 754         iscsi_release_param_list(conn->param_list);
 755         conn->param_list = NULL;
 756
 757         iscsit_determine_maxcmdsn(sess);
 758
 759         spin_lock_bh(&se_tpg->session_lock);
 760         __transport_register_session(&sess->tpg->tpg_se_tpg,
 761                         se_sess->se_node_acl, se_sess, sess);
 762         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 763         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 764
 765         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 766                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 767                 tpg->tpgt);
 768
 769         spin_lock_bh(&sess->conn_lock);
 770         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 771         atomic_inc(&sess->nconn);
 772         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 773                 " %s\n", atomic_read(&sess->nconn),
 774                 sess->sess_ops->InitiatorName);
 775         spin_unlock_bh(&sess->conn_lock);
 776
 777         sess->sid = tpg->sid++;
 778         if (!sess->sid)
 779                 sess->sid = tpg->sid++;
 780         pr_debug("Established iSCSI session from node: %s\n",
 781                         sess->sess_ops->InitiatorName);
 782
 783         tpg->nsessions++;
 784         if (tpg->tpg_tiqn)
 785                 tpg->tpg_tiqn->tiqn_nsessions++;
 786
 787         pr_debug("Incremented number of active iSCSI sessions to %u on"
 788                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 789         spin_unlock_bh(&se_tpg->session_lock);
 790
 791         iscsi_post_login_start_timers(conn);
 792         /*
 793          * Determine CPU mask to ensure connection's RX and TX kthreads
 794          * are scheduled on the same CPU.
 795          */
 796         iscsit_thread_get_cpumask(conn);
 797         conn->conn_rx_reset_cpumask = 1;
 798         conn->conn_tx_reset_cpumask = 1;
 799         /*
 800          * Wakeup the sleeping iscsi_target_rx_thread() now that
 801          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 802          */
 803         complete(&conn->rx_login_comp);
 804         iscsit_dec_conn_usage_count(conn);
 805 }
 806
 807 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 808 {
 809         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 810
 811         spin_lock_bh(&np->np_thread_lock);
 812         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 813                         &np->np_sockaddr);
 814
 815         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 816                 spin_unlock_bh(&np->np_thread_lock);
 817                 return;
 818         }
 819
 820         if (np->np_thread)
 821                 send_sig(SIGINT, np->np_thread, 1);
 822
 823         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 824         spin_unlock_bh(&np->np_thread_lock);
 825 }
 826
 827 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 828 {
 829         /*
 830          * This used the TA_LOGIN_TIMEOUT constant because at this
 831          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 832          */
 833         spin_lock_bh(&np->np_thread_lock);
 834         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 835         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 836         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 837
 838         pr_debug("Added timeout timer to iSCSI login request for"
 839                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 840         spin_unlock_bh(&np->np_thread_lock);
 841 }
 842
 843 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 844 {
 845         spin_lock_bh(&np->np_thread_lock);
 846         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 847                 spin_unlock_bh(&np->np_thread_lock);
 848                 return;
 849         }
 850         np->np_login_timer_flags |= ISCSI_TF_STOP;
 851         spin_unlock_bh(&np->np_thread_lock);
 852
 853         del_timer_sync(&np->np_login_timer);
 854
 855         spin_lock_bh(&np->np_thread_lock);
 856         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 857         spin_unlock_bh(&np->np_thread_lock);
 858 }
 859
 860 int iscsit_setup_np(
 861         struct iscsi_np *np,
 862         struct sockaddr_storage *sockaddr)
 863 {
 864         struct socket *sock = NULL;
 865         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 866
 867         switch (np->np_network_transport) {
 868         case ISCSI_TCP:
 869                 np->np_ip_proto = IPPROTO_TCP;
 870                 np->np_sock_type = SOCK_STREAM;
 871                 break;
 872         case ISCSI_SCTP_TCP:
 873                 np->np_ip_proto = IPPROTO_SCTP;
 874                 np->np_sock_type = SOCK_STREAM;
 875                 break;
 876         case ISCSI_SCTP_UDP:
 877                 np->np_ip_proto = IPPROTO_SCTP;
 878                 np->np_sock_type = SOCK_SEQPACKET;
 879                 break;
 880         default:
 881                 pr_err("Unsupported network_transport: %d\n",
 882                                 np->np_network_transport);
 883                 return -EINVAL;
 884         }
 885
 886         np->np_ip_proto = IPPROTO_TCP;
 887         np->np_sock_type = SOCK_STREAM;
 888
 889         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 890                         np->np_ip_proto, &sock);
 891         if (ret < 0) {
 892                 pr_err("sock_create() failed.\n");
 893                 return ret;
 894         }
 895         np->np_socket = sock;
 896         /*
 897          * Setup the np->np_sockaddr from the passed sockaddr setup
 898          * in iscsi_target_configfs.c code..
 899          */
 900         memcpy(&np->np_sockaddr, sockaddr,
 901                         sizeof(struct sockaddr_storage));
 902
 903         if (sockaddr->ss_family == AF_INET6)
 904                 len = sizeof(struct sockaddr_in6);
 905         else
 906                 len = sizeof(struct sockaddr_in);
 907         /*
 908          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 909          */
 910         /* FIXME: Someone please explain why this is endian-safe */
 911         opt = 1;
 912         if (np->np_network_transport == ISCSI_TCP) {
 913                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 914                                 (char *)&opt, sizeof(opt));
 915                 if (ret < 0) {
 916                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 917                                 " failed: %d\n", ret);
 918                         goto fail;
 919                 }
 920         }
 921
 922         /* FIXME: Someone please explain why this is endian-safe */
 923         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 924                         (char *)&opt, sizeof(opt));
 925         if (ret < 0) {
 926                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 927                         " failed\n");
 928                 goto fail;
 929         }
 930
 931         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 932                         (char *)&opt, sizeof(opt));
 933         if (ret < 0) {
 934                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 935                         " failed\n");
 936                 goto fail;
 937         }
 938
 939         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 940         if (ret < 0) {
 941                 pr_err("kernel_bind() failed: %d\n", ret);
 942                 goto fail;
 943         }
 944
 945         ret = kernel_listen(sock, backlog);
 946         if (ret != 0) {
 947                 pr_err("kernel_listen() failed: %d\n", ret);
 948                 goto fail;
 949         }
 950
 951         return 0;
 952 fail:
 953         np->np_socket = NULL;
 954         sock_release(sock);
 955         return ret;
 956 }
 957
 958 int iscsi_target_setup_login_socket(
 959         struct iscsi_np *np,
 960         struct sockaddr_storage *sockaddr)
 961 {
 962         struct iscsit_transport *t;
 963         int rc;
 964
 965         t = iscsit_get_transport(np->np_network_transport);
 966         if (!t)
 967                 return -EINVAL;
 968
 969         rc = t->iscsit_setup_np(np, sockaddr);
 970         if (rc < 0) {
 971                 iscsit_put_transport(t);
 972                 return rc;
 973         }
 974
 975         np->np_transport = t;
 976         np->enabled = true;
 977         return 0;
 978 }
 979
 980 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 981 {
 982         struct socket *new_sock, *sock = np->np_socket;
 983         struct sockaddr_in sock_in;
 984         struct sockaddr_in6 sock_in6;
 985         int rc;
 986
 987         rc = kernel_accept(sock, &new_sock, 0);
 988         if (rc < 0)
 989                 return rc;
 990
 991         conn->sock = new_sock;
 992         conn->login_family = np->np_sockaddr.ss_family;
 993
 994         if (np->np_sockaddr.ss_family == AF_INET6) {
 995                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 996
 997                 rc = conn->sock->ops->getname(conn->sock,
 998                                 (struct sockaddr *)&sock_in6, 1);
 999                 if (rc >= 0) {
1000                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1001                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1002                         } else {
1003                                 /* Pretend to be an ipv4 socket */
1004                                 sock_in.sin_family = AF_INET;
1005                                 sock_in.sin_port = sock_in6.sin6_port;
1006                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1007                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1008                         }
1009                 }
1010
1011                 rc = conn->sock->ops->getname(conn->sock,
1012                                 (struct sockaddr *)&sock_in6, 0);
1013                 if (rc >= 0) {
1014                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1015                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1016                         } else {
1017                                 /* Pretend to be an ipv4 socket */
1018                                 sock_in.sin_family = AF_INET;
1019                                 sock_in.sin_port = sock_in6.sin6_port;
1020                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1021                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1022                         }
1023                 }
1024         } else {
1025                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1026
1027                 rc = conn->sock->ops->getname(conn->sock,
1028                                 (struct sockaddr *)&sock_in, 1);
1029                 if (rc >= 0)
1030                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1031
1032                 rc = conn->sock->ops->getname(conn->sock,
1033                                 (struct sockaddr *)&sock_in, 0);
1034                 if (rc >= 0)
1035                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1036         }
1037
1038         return 0;
1039 }
1040
1041 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1042 {
1043         struct iscsi_login_req *login_req;
1044         u32 padding = 0, payload_length;
1045
1046         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1047                 return -1;
1048
1049         login_req = (struct iscsi_login_req *)login->req;
1050         payload_length  = ntoh24(login_req->dlength);
1051         padding = ((-payload_length) & 3);
1052
1053         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1054                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1055                 login_req->flags, login_req->itt, login_req->cmdsn,
1056                 login_req->exp_statsn, login_req->cid, payload_length);
1057         /*
1058          * Setup the initial iscsi_login values from the leading
1059          * login request PDU.
1060          */
1061         if (login->first_request) {
1062                 login_req = (struct iscsi_login_req *)login->req;
1063                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1064                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1065                 login->version_min      = login_req->min_version;
1066                 login->version_max      = login_req->max_version;
1067                 memcpy(login->isid, login_req->isid, 6);
1068                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1069                 login->init_task_tag    = login_req->itt;
1070                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1071                 login->cid              = be16_to_cpu(login_req->cid);
1072                 login->tsih             = be16_to_cpu(login_req->tsih);
1073         }
1074
1075         if (iscsi_target_check_login_request(conn, login) < 0)
1076                 return -1;
1077
1078         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1079         if (iscsi_login_rx_data(conn, login->req_buf,
1080                                 payload_length + padding) < 0)
1081                 return -1;
1082
1083         return 0;
1084 }
1085
1086 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1087                         u32 length)
1088 {
1089         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1090                 return -1;
1091
1092         return 0;
1093 }
1094
1095 static int
1096 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1097 {
1098         int rc;
1099
1100         if (!t->owner) {
1101                 conn->conn_transport = t;
1102                 return 0;
1103         }
1104
1105         rc = try_module_get(t->owner);
1106         if (!rc) {
1107                 pr_err("try_module_get() failed for %s\n", t->name);
1108                 return -EINVAL;
1109         }
1110
1111         conn->conn_transport = t;
1112         return 0;
1113 }
1114
1115 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1116 {
1117         struct iscsi_conn *conn;
1118
1119         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1120         if (!conn) {
1121                 pr_err("Could not allocate memory for new connection\n");
1122                 return NULL;
1123         }
1124         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1125         conn->conn_state = TARG_CONN_STATE_FREE;
1126
1127         init_waitqueue_head(&conn->queues_wq);
1128         INIT_LIST_HEAD(&conn->conn_list);
1129         INIT_LIST_HEAD(&conn->conn_cmd_list);
1130         INIT_LIST_HEAD(&conn->immed_queue_list);
1131         INIT_LIST_HEAD(&conn->response_queue_list);
1132         init_completion(&conn->conn_post_wait_comp);
1133         init_completion(&conn->conn_wait_comp);
1134         init_completion(&conn->conn_wait_rcfr_comp);
1135         init_completion(&conn->conn_waiting_on_uc_comp);
1136         init_completion(&conn->conn_logout_comp);
1137         init_completion(&conn->rx_half_close_comp);
1138         init_completion(&conn->tx_half_close_comp);
1139         init_completion(&conn->rx_login_comp);
1140         spin_lock_init(&conn->cmd_lock);
1141         spin_lock_init(&conn->conn_usage_lock);
1142         spin_lock_init(&conn->immed_queue_lock);
1143         spin_lock_init(&conn->nopin_timer_lock);
1144         spin_lock_init(&conn->response_queue_lock);
1145         spin_lock_init(&conn->state_lock);
1146
1147         timer_setup(&conn->nopin_response_timer,
1148                     iscsit_handle_nopin_response_timeout, 0);
1149         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1150
1151         if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1152                 goto free_conn;
1153
1154         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1155         if (!conn->conn_ops) {
1156                 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1157                 goto put_transport;
1158         }
1159
1160         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1161                 pr_err("Unable to allocate conn->conn_cpumask\n");
1162                 goto free_mask;
1163         }
1164
1165         return conn;
1166
1167 free_mask:
1168         free_cpumask_var(conn->conn_cpumask);
1169 put_transport:
1170         iscsit_put_transport(conn->conn_transport);
1171 free_conn:
1172         kfree(conn);
1173         return NULL;
1174 }
1175
1176 void iscsit_free_conn(struct iscsi_conn *conn)
1177 {
1178         free_cpumask_var(conn->conn_cpumask);
1179         kfree(conn->conn_ops);
1180         iscsit_put_transport(conn->conn_transport);
1181         kfree(conn);
1182 }
1183
1184 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1185                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1186 {
1187         if (!new_sess)
1188                 goto old_sess_out;
1189
1190         pr_err("iSCSI Login negotiation failed.\n");
1191         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1192                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1193         if (!zero_tsih || !conn->sess)
1194                 goto old_sess_out;
1195
1196         transport_free_session(conn->sess->se_sess);
1197         ida_free(&sess_ida, conn->sess->session_index);
1198         kfree(conn->sess->sess_ops);
1199         kfree(conn->sess);
1200         conn->sess = NULL;
1201
1202 old_sess_out:
1203         iscsi_stop_login_thread_timer(np);
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         tpg_np = conn->tpg_np;
1444         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1445         new_sess = false;
1446
1447         if (tpg) {
1448                 iscsit_deaccess_np(np, tpg, tpg_np);
1449                 tpg = NULL;
1450                 tpg_np = NULL;
1451         }
1452
1453         return 1;
1454
1455 exit:
1456         iscsi_stop_login_thread_timer(np);
1457         spin_lock_bh(&np->np_thread_lock);
1458         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1459         spin_unlock_bh(&np->np_thread_lock);
1460
1461         return 0;
1462 }
1463
1464 int iscsi_target_login_thread(void *arg)
1465 {
1466         struct iscsi_np *np = arg;
1467         int ret;
1468
1469         allow_signal(SIGINT);
1470
1471         while (1) {
1472                 ret = __iscsi_target_login_thread(np);
1473                 /*
1474                  * We break and exit here unless another sock_accept() call
1475                  * is expected.
1476                  */
1477                 if (ret != 1)
1478                         break;
1479         }
1480
1481         while (!kthread_should_stop()) {
1482                 msleep(100);
1483         }
1484
1485         return 0;
1486 }