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