drivers/target/iscsi/iscsi_target

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This source file includes following definitions.
iscsi_login_init_conn
iscsi_login_setup_crypto
iscsi_login_check_initiator_version
iscsi_check_for_session_reinstatement
iscsi_login_set_conn_values
__printf
iscsi_login_zero_tsih_s1
iscsi_login_zero_tsih_s2
iscsi_login_non_zero_tsih_s1
iscsi_login_non_zero_tsih_s2
iscsi_login_post_auth_non_zero_tsih
iscsi_post_login_start_timers
iscsit_start_kthreads
iscsi_post_login_handler
iscsi_handle_login_thread_timeout
iscsi_start_login_thread_timer
iscsi_stop_login_thread_timer
iscsit_setup_np
iscsi_target_setup_login_socket
iscsit_accept_np
iscsit_get_login_rx
iscsit_put_login_tx
iscsit_conn_set_transport
iscsit_alloc_conn
iscsit_free_conn
iscsi_target_login_sess_out
__iscsi_target_login_thread
iscsi_target_login_thread
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains the login functions used by the iSCSI Target driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10 
  11 #include <crypto/hash.h>
  12 #include <linux/module.h>
  13 #include <linux/string.h>
  14 #include <linux/kthread.h>
  15 #include <linux/sched/signal.h>
  16 #include <linux/idr.h>
  17 #include <linux/tcp.h>        /* TCP_NODELAY */
  18 #include <net/ipv6.h>         /* ipv6_addr_v4mapped() */
  19 #include <scsi/iscsi_proto.h>
  20 #include <target/target_core_base.h>
  21 #include <target/target_core_fabric.h>
  22 
  23 #include <target/iscsi/iscsi_target_core.h>
  24 #include <target/iscsi/iscsi_target_stat.h>
  25 #include "iscsi_target_device.h"
  26 #include "iscsi_target_nego.h"
  27 #include "iscsi_target_erl0.h"
  28 #include "iscsi_target_erl2.h"
  29 #include "iscsi_target_login.h"
  30 #include "iscsi_target_tpg.h"
  31 #include "iscsi_target_util.h"
  32 #include "iscsi_target.h"
  33 #include "iscsi_target_parameters.h"
  34 
  35 #include <target/iscsi/iscsi_transport.h>
  36 
  37 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
  38 {
  39         struct iscsi_login *login;
  40 
  41         login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
  42         if (!login) {
  43                 pr_err("Unable to allocate memory for struct iscsi_login.\n");
  44                 return NULL;
  45         }
  46         conn->login = login;
  47         login->conn = conn;
  48         login->first_request = 1;
  49 
  50         login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  51         if (!login->req_buf) {
  52                 pr_err("Unable to allocate memory for response buffer.\n");
  53                 goto out_login;
  54         }
  55 
  56         login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
  57         if (!login->rsp_buf) {
  58                 pr_err("Unable to allocate memory for request buffer.\n");
  59                 goto out_req_buf;
  60         }
  61 
  62         conn->conn_login = login;
  63 
  64         return login;
  65 
  66 out_req_buf:
  67         kfree(login->req_buf);
  68 out_login:
  69         kfree(login);
  70         return NULL;
  71 }
  72 
  73 /*
  74  * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
  75  * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
  76  */
  77 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
  78 {
  79         struct crypto_ahash *tfm;
  80 
  81         /*
  82          * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
  83          * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
  84          * to software 1x8 byte slicing from crc32c.ko
  85          */
  86         tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
  87         if (IS_ERR(tfm)) {
  88                 pr_err("crypto_alloc_ahash() failed\n");
  89                 return -ENOMEM;
  90         }
  91 
  92         conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
  93         if (!conn->conn_rx_hash) {
  94                 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
  95                 crypto_free_ahash(tfm);
  96                 return -ENOMEM;
  97         }
  98         ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
  99 
 100         conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
 101         if (!conn->conn_tx_hash) {
 102                 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
 103                 ahash_request_free(conn->conn_rx_hash);
 104                 conn->conn_rx_hash = NULL;
 105                 crypto_free_ahash(tfm);
 106                 return -ENOMEM;
 107         }
 108         ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
 109 
 110         return 0;
 111 }
 112 
 113 static int iscsi_login_check_initiator_version(
 114         struct iscsi_conn *conn,
 115         u8 version_max,
 116         u8 version_min)
 117 {
 118         if ((version_max != 0x00) || (version_min != 0x00)) {
 119                 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
 120                         " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
 121                         version_min, version_max);
 122                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 123                                 ISCSI_LOGIN_STATUS_NO_VERSION);
 124                 return -1;
 125         }
 126 
 127         return 0;
 128 }
 129 
 130 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
 131 {
 132         int sessiontype;
 133         struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
 134         struct iscsi_portal_group *tpg = conn->tpg;
 135         struct iscsi_session *sess = NULL, *sess_p = NULL;
 136         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 137         struct se_session *se_sess, *se_sess_tmp;
 138 
 139         initiatorname_param = iscsi_find_param_from_key(
 140                         INITIATORNAME, conn->param_list);
 141         sessiontype_param = iscsi_find_param_from_key(
 142                         SESSIONTYPE, conn->param_list);
 143         if (!initiatorname_param || !sessiontype_param) {
 144                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 145                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 146                 return -1;
 147         }
 148 
 149         sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
 150 
 151         spin_lock_bh(&se_tpg->session_lock);
 152         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 153                         sess_list) {
 154 
 155                 sess_p = se_sess->fabric_sess_ptr;
 156                 spin_lock(&sess_p->conn_lock);
 157                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 158                     atomic_read(&sess_p->session_logout) ||
 159                     atomic_read(&sess_p->session_close) ||
 160                     (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
 161                         spin_unlock(&sess_p->conn_lock);
 162                         continue;
 163                 }
 164                 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
 165                    (!strcmp(sess_p->sess_ops->InitiatorName,
 166                             initiatorname_param->value) &&
 167                    (sess_p->sess_ops->SessionType == sessiontype))) {
 168                         atomic_set(&sess_p->session_reinstatement, 1);
 169                         atomic_set(&sess_p->session_fall_back_to_erl0, 1);
 170                         atomic_set(&sess_p->session_close, 1);
 171                         spin_unlock(&sess_p->conn_lock);
 172                         iscsit_inc_session_usage_count(sess_p);
 173                         iscsit_stop_time2retain_timer(sess_p);
 174                         sess = sess_p;
 175                         break;
 176                 }
 177                 spin_unlock(&sess_p->conn_lock);
 178         }
 179         spin_unlock_bh(&se_tpg->session_lock);
 180         /*
 181          * If the Time2Retain handler has expired, the session is already gone.
 182          */
 183         if (!sess)
 184                 return 0;
 185 
 186         pr_debug("%s iSCSI Session SID %u is still active for %s,"
 187                 " performing session reinstatement.\n", (sessiontype) ?
 188                 "Discovery" : "Normal", sess->sid,
 189                 sess->sess_ops->InitiatorName);
 190 
 191         spin_lock_bh(&sess->conn_lock);
 192         if (sess->session_state == TARG_SESS_STATE_FAILED) {
 193                 spin_unlock_bh(&sess->conn_lock);
 194                 iscsit_dec_session_usage_count(sess);
 195                 return 0;
 196         }
 197         spin_unlock_bh(&sess->conn_lock);
 198 
 199         iscsit_stop_session(sess, 1, 1);
 200         iscsit_dec_session_usage_count(sess);
 201 
 202         return 0;
 203 }
 204 
 205 static int iscsi_login_set_conn_values(
 206         struct iscsi_session *sess,
 207         struct iscsi_conn *conn,
 208         __be16 cid)
 209 {
 210         int ret;
 211         conn->sess              = sess;
 212         conn->cid               = be16_to_cpu(cid);
 213         /*
 214          * Generate a random Status sequence number (statsn) for the new
 215          * iSCSI connection.
 216          */
 217         ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
 218         if (unlikely(ret))
 219                 return ret;
 220 
 221         mutex_lock(&auth_id_lock);
 222         conn->auth_id           = iscsit_global->auth_id++;
 223         mutex_unlock(&auth_id_lock);
 224         return 0;
 225 }
 226 
 227 __printf(2, 3) int iscsi_change_param_sprintf(
 228         struct iscsi_conn *conn,
 229         const char *fmt, ...)
 230 {
 231         va_list args;
 232         unsigned char buf[64];
 233 
 234         memset(buf, 0, sizeof buf);
 235 
 236         va_start(args, fmt);
 237         vsnprintf(buf, sizeof buf, fmt, args);
 238         va_end(args);
 239 
 240         if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
 241                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 242                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 243                 return -1;
 244         }
 245 
 246         return 0;
 247 }
 248 EXPORT_SYMBOL(iscsi_change_param_sprintf);
 249 
 250 /*
 251  *      This is the leading connection of a new session,
 252  *      or session reinstatement.
 253  */
 254 static int iscsi_login_zero_tsih_s1(
 255         struct iscsi_conn *conn,
 256         unsigned char *buf)
 257 {
 258         struct iscsi_session *sess = NULL;
 259         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 260         int ret;
 261 
 262         sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
 263         if (!sess) {
 264                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 265                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 266                 pr_err("Could not allocate memory for session\n");
 267                 return -ENOMEM;
 268         }
 269 
 270         if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
 271                 goto free_sess;
 272 
 273         sess->init_task_tag     = pdu->itt;
 274         memcpy(&sess->isid, pdu->isid, 6);
 275         sess->exp_cmd_sn        = be32_to_cpu(pdu->cmdsn);
 276         INIT_LIST_HEAD(&sess->sess_conn_list);
 277         INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
 278         INIT_LIST_HEAD(&sess->cr_active_list);
 279         INIT_LIST_HEAD(&sess->cr_inactive_list);
 280         init_completion(&sess->async_msg_comp);
 281         init_completion(&sess->reinstatement_comp);
 282         init_completion(&sess->session_wait_comp);
 283         init_completion(&sess->session_waiting_on_uc_comp);
 284         mutex_init(&sess->cmdsn_mutex);
 285         spin_lock_init(&sess->conn_lock);
 286         spin_lock_init(&sess->cr_a_lock);
 287         spin_lock_init(&sess->cr_i_lock);
 288         spin_lock_init(&sess->session_usage_lock);
 289         spin_lock_init(&sess->ttt_lock);
 290 
 291         timer_setup(&sess->time2retain_timer,
 292                     iscsit_handle_time2retain_timeout, 0);
 293 
 294         ret = ida_alloc(&sess_ida, GFP_KERNEL);
 295         if (ret < 0) {
 296                 pr_err("Session ID allocation failed %d\n", ret);
 297                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 298                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 299                 goto free_sess;
 300         }
 301 
 302         sess->session_index = ret;
 303         sess->creation_time = get_jiffies_64();
 304         /*
 305          * The FFP CmdSN window values will be allocated from the TPG's
 306          * Initiator Node's ACL once the login has been successfully completed.
 307          */
 308         atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
 309 
 310         sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
 311         if (!sess->sess_ops) {
 312                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 313                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 314                 pr_err("Unable to allocate memory for"
 315                                 " struct iscsi_sess_ops.\n");
 316                 goto free_id;
 317         }
 318 
 319         sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
 320         if (IS_ERR(sess->se_sess)) {
 321                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 322                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 323                 goto free_ops;
 324         }
 325 
 326         return 0;
 327 
 328 free_ops:
 329         kfree(sess->sess_ops);
 330 free_id:
 331         ida_free(&sess_ida, sess->session_index);
 332 free_sess:
 333         kfree(sess);
 334         conn->sess = NULL;
 335         return -ENOMEM;
 336 }
 337 
 338 static int iscsi_login_zero_tsih_s2(
 339         struct iscsi_conn *conn)
 340 {
 341         struct iscsi_node_attrib *na;
 342         struct iscsi_session *sess = conn->sess;
 343         bool iser = false;
 344 
 345         sess->tpg = conn->tpg;
 346 
 347         /*
 348          * Assign a new TPG Session Handle.  Note this is protected with
 349          * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
 350          */
 351         sess->tsih = ++sess->tpg->ntsih;
 352         if (!sess->tsih)
 353                 sess->tsih = ++sess->tpg->ntsih;
 354 
 355         /*
 356          * Create the default params from user defined values..
 357          */
 358         if (iscsi_copy_param_list(&conn->param_list,
 359                                 conn->tpg->param_list, 1) < 0) {
 360                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 361                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 362                 return -1;
 363         }
 364 
 365         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 366                 iser = true;
 367 
 368         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 369 
 370         if (sess->sess_ops->SessionType)
 371                 return iscsi_set_keys_irrelevant_for_discovery(
 372                                 conn->param_list);
 373 
 374         na = iscsit_tpg_get_node_attrib(sess);
 375 
 376         /*
 377          * Need to send TargetPortalGroupTag back in first login response
 378          * on any iSCSI connection where the Initiator provides TargetName.
 379          * See 5.3.1.  Login Phase Start
 380          *
 381          * In our case, we have already located the struct iscsi_tiqn at this point.
 382          */
 383         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 384                 return -1;
 385 
 386         /*
 387          * Workaround for Initiators that have broken connection recovery logic.
 388          *
 389          * "We would really like to get rid of this." Linux-iSCSI.org team
 390          */
 391         if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
 392                 return -1;
 393 
 394         /*
 395          * Set RDMAExtensions=Yes by default for iSER enabled network portals
 396          */
 397         if (iser) {
 398                 struct iscsi_param *param;
 399                 unsigned long mrdsl, off;
 400                 int rc;
 401 
 402                 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
 403                         return -1;
 404 
 405                 /*
 406                  * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
 407                  * Immediate Data + Unsolicited Data-OUT if necessary..
 408                  */
 409                 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
 410                                                   conn->param_list);
 411                 if (!param) {
 412                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 413                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 414                         return -1;
 415                 }
 416                 rc = kstrtoul(param->value, 0, &mrdsl);
 417                 if (rc < 0) {
 418                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 419                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 420                         return -1;
 421                 }
 422                 off = mrdsl % PAGE_SIZE;
 423                 if (!off)
 424                         goto check_prot;
 425 
 426                 if (mrdsl < PAGE_SIZE)
 427                         mrdsl = PAGE_SIZE;
 428                 else
 429                         mrdsl -= off;
 430 
 431                 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
 432                         " to PAGE_SIZE\n", mrdsl);
 433 
 434                 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
 435                         return -1;
 436                 /*
 437                  * ISER currently requires that ImmediateData + Unsolicited
 438                  * Data be disabled when protection / signature MRs are enabled.
 439                  */
 440 check_prot:
 441                 if (sess->se_sess->sup_prot_ops &
 442                    (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
 443                     TARGET_PROT_DOUT_INSERT)) {
 444 
 445                         if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
 446                                 return -1;
 447 
 448                         if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
 449                                 return -1;
 450 
 451                         pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
 452                                  " T10-PI enabled ISER session\n");
 453                 }
 454         }
 455 
 456         return 0;
 457 }
 458 
 459 static int iscsi_login_non_zero_tsih_s1(
 460         struct iscsi_conn *conn,
 461         unsigned char *buf)
 462 {
 463         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 464 
 465         return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
 466 }
 467 
 468 /*
 469  *      Add a new connection to an existing session.
 470  */
 471 static int iscsi_login_non_zero_tsih_s2(
 472         struct iscsi_conn *conn,
 473         unsigned char *buf)
 474 {
 475         struct iscsi_portal_group *tpg = conn->tpg;
 476         struct iscsi_session *sess = NULL, *sess_p = NULL;
 477         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 478         struct se_session *se_sess, *se_sess_tmp;
 479         struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
 480         bool iser = false;
 481 
 482         spin_lock_bh(&se_tpg->session_lock);
 483         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
 484                         sess_list) {
 485 
 486                 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
 487                 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
 488                     atomic_read(&sess_p->session_logout) ||
 489                     atomic_read(&sess_p->session_close) ||
 490                    (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
 491                         continue;
 492                 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
 493                      (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
 494                         iscsit_inc_session_usage_count(sess_p);
 495                         iscsit_stop_time2retain_timer(sess_p);
 496                         sess = sess_p;
 497                         break;
 498                 }
 499         }
 500         spin_unlock_bh(&se_tpg->session_lock);
 501 
 502         /*
 503          * If the Time2Retain handler has expired, the session is already gone.
 504          */
 505         if (!sess) {
 506                 pr_err("Initiator attempting to add a connection to"
 507                         " a non-existent session, rejecting iSCSI Login.\n");
 508                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 509                                 ISCSI_LOGIN_STATUS_NO_SESSION);
 510                 return -1;
 511         }
 512 
 513         /*
 514          * Stop the Time2Retain timer if this is a failed session, we restart
 515          * the timer if the login is not successful.
 516          */
 517         spin_lock_bh(&sess->conn_lock);
 518         if (sess->session_state == TARG_SESS_STATE_FAILED)
 519                 atomic_set(&sess->session_continuation, 1);
 520         spin_unlock_bh(&sess->conn_lock);
 521 
 522         if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
 523             iscsi_copy_param_list(&conn->param_list,
 524                         conn->tpg->param_list, 0) < 0) {
 525                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 526                                 ISCSI_LOGIN_STATUS_NO_RESOURCES);
 527                 return -1;
 528         }
 529 
 530         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 531                 iser = true;
 532 
 533         iscsi_set_keys_to_negotiate(conn->param_list, iser);
 534         /*
 535          * Need to send TargetPortalGroupTag back in first login response
 536          * on any iSCSI connection where the Initiator provides TargetName.
 537          * See 5.3.1.  Login Phase Start
 538          *
 539          * In our case, we have already located the struct iscsi_tiqn at this point.
 540          */
 541         if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
 542                 return -1;
 543 
 544         return 0;
 545 }
 546 
 547 int iscsi_login_post_auth_non_zero_tsih(
 548         struct iscsi_conn *conn,
 549         u16 cid,
 550         u32 exp_statsn)
 551 {
 552         struct iscsi_conn *conn_ptr = NULL;
 553         struct iscsi_conn_recovery *cr = NULL;
 554         struct iscsi_session *sess = conn->sess;
 555 
 556         /*
 557          * By following item 5 in the login table,  if we have found
 558          * an existing ISID and a valid/existing TSIH and an existing
 559          * CID we do connection reinstatement.  Currently we dont not
 560          * support it so we send back an non-zero status class to the
 561          * initiator and release the new connection.
 562          */
 563         conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
 564         if (conn_ptr) {
 565                 pr_err("Connection exists with CID %hu for %s,"
 566                         " performing connection reinstatement.\n",
 567                         conn_ptr->cid, sess->sess_ops->InitiatorName);
 568 
 569                 iscsit_connection_reinstatement_rcfr(conn_ptr);
 570                 iscsit_dec_conn_usage_count(conn_ptr);
 571         }
 572 
 573         /*
 574          * Check for any connection recovery entries containing CID.
 575          * We use the original ExpStatSN sent in the first login request
 576          * to acknowledge commands for the failed connection.
 577          *
 578          * Also note that an explict logout may have already been sent,
 579          * but the response may not be sent due to additional connection
 580          * loss.
 581          */
 582         if (sess->sess_ops->ErrorRecoveryLevel == 2) {
 583                 cr = iscsit_get_inactive_connection_recovery_entry(
 584                                 sess, cid);
 585                 if (cr) {
 586                         pr_debug("Performing implicit logout"
 587                                 " for connection recovery on CID: %hu\n",
 588                                         conn->cid);
 589                         iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
 590                 }
 591         }
 592 
 593         /*
 594          * Else we follow item 4 from the login table in that we have
 595          * found an existing ISID and a valid/existing TSIH and a new
 596          * CID we go ahead and continue to add a new connection to the
 597          * session.
 598          */
 599         pr_debug("Adding CID %hu to existing session for %s.\n",
 600                         cid, sess->sess_ops->InitiatorName);
 601 
 602         if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
 603                 pr_err("Adding additional connection to this session"
 604                         " would exceed MaxConnections %d, login failed.\n",
 605                                 sess->sess_ops->MaxConnections);
 606                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 607                                 ISCSI_LOGIN_STATUS_ISID_ERROR);
 608                 return -1;
 609         }
 610 
 611         return 0;
 612 }
 613 
 614 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
 615 {
 616         struct iscsi_session *sess = conn->sess;
 617         /*
 618          * FIXME: Unsolicited NopIN support for ISER
 619          */
 620         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
 621                 return;
 622 
 623         if (!sess->sess_ops->SessionType)
 624                 iscsit_start_nopin_timer(conn);
 625 }
 626 
 627 int iscsit_start_kthreads(struct iscsi_conn *conn)
 628 {
 629         int ret = 0;
 630 
 631         spin_lock(&iscsit_global->ts_bitmap_lock);
 632         conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
 633                                         ISCSIT_BITMAP_BITS, get_order(1));
 634         spin_unlock(&iscsit_global->ts_bitmap_lock);
 635 
 636         if (conn->bitmap_id < 0) {
 637                 pr_err("bitmap_find_free_region() failed for"
 638                        " iscsit_start_kthreads()\n");
 639                 return -ENOMEM;
 640         }
 641 
 642         conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
 643                                       "%s", ISCSI_TX_THREAD_NAME);
 644         if (IS_ERR(conn->tx_thread)) {
 645                 pr_err("Unable to start iscsi_target_tx_thread\n");
 646                 ret = PTR_ERR(conn->tx_thread);
 647                 goto out_bitmap;
 648         }
 649         conn->tx_thread_active = true;
 650 
 651         conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
 652                                       "%s", ISCSI_RX_THREAD_NAME);
 653         if (IS_ERR(conn->rx_thread)) {
 654                 pr_err("Unable to start iscsi_target_rx_thread\n");
 655                 ret = PTR_ERR(conn->rx_thread);
 656                 goto out_tx;
 657         }
 658         conn->rx_thread_active = true;
 659 
 660         return 0;
 661 out_tx:
 662         send_sig(SIGINT, conn->tx_thread, 1);
 663         kthread_stop(conn->tx_thread);
 664         conn->tx_thread_active = false;
 665 out_bitmap:
 666         spin_lock(&iscsit_global->ts_bitmap_lock);
 667         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 668                               get_order(1));
 669         spin_unlock(&iscsit_global->ts_bitmap_lock);
 670         return ret;
 671 }
 672 
 673 void iscsi_post_login_handler(
 674         struct iscsi_np *np,
 675         struct iscsi_conn *conn,
 676         u8 zero_tsih)
 677 {
 678         int stop_timer = 0;
 679         struct iscsi_session *sess = conn->sess;
 680         struct se_session *se_sess = sess->se_sess;
 681         struct iscsi_portal_group *tpg = sess->tpg;
 682         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
 683 
 684         iscsit_inc_conn_usage_count(conn);
 685 
 686         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
 687                         ISCSI_LOGIN_STATUS_ACCEPT);
 688 
 689         pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
 690         conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
 691 
 692         iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
 693         /*
 694          * SCSI Initiator -> SCSI Target Port Mapping
 695          */
 696         if (!zero_tsih) {
 697                 iscsi_set_session_parameters(sess->sess_ops,
 698                                 conn->param_list, 0);
 699                 iscsi_release_param_list(conn->param_list);
 700                 conn->param_list = NULL;
 701 
 702                 spin_lock_bh(&sess->conn_lock);
 703                 atomic_set(&sess->session_continuation, 0);
 704                 if (sess->session_state == TARG_SESS_STATE_FAILED) {
 705                         pr_debug("Moving to"
 706                                         " TARG_SESS_STATE_LOGGED_IN.\n");
 707                         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 708                         stop_timer = 1;
 709                 }
 710 
 711                 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
 712                         " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
 713                         &conn->local_sockaddr, tpg->tpgt);
 714 
 715                 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 716                 atomic_inc(&sess->nconn);
 717                 pr_debug("Incremented iSCSI Connection count to %hu"
 718                         " from node: %s\n", atomic_read(&sess->nconn),
 719                         sess->sess_ops->InitiatorName);
 720                 spin_unlock_bh(&sess->conn_lock);
 721 
 722                 iscsi_post_login_start_timers(conn);
 723                 /*
 724                  * Determine CPU mask to ensure connection's RX and TX kthreads
 725                  * are scheduled on the same CPU.
 726                  */
 727                 iscsit_thread_get_cpumask(conn);
 728                 conn->conn_rx_reset_cpumask = 1;
 729                 conn->conn_tx_reset_cpumask = 1;
 730                 /*
 731                  * Wakeup the sleeping iscsi_target_rx_thread() now that
 732                  * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 733                  */
 734                 complete(&conn->rx_login_comp);
 735                 iscsit_dec_conn_usage_count(conn);
 736 
 737                 if (stop_timer) {
 738                         spin_lock_bh(&se_tpg->session_lock);
 739                         iscsit_stop_time2retain_timer(sess);
 740                         spin_unlock_bh(&se_tpg->session_lock);
 741                 }
 742                 iscsit_dec_session_usage_count(sess);
 743                 return;
 744         }
 745 
 746         iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
 747         iscsi_release_param_list(conn->param_list);
 748         conn->param_list = NULL;
 749 
 750         iscsit_determine_maxcmdsn(sess);
 751 
 752         spin_lock_bh(&se_tpg->session_lock);
 753         __transport_register_session(&sess->tpg->tpg_se_tpg,
 754                         se_sess->se_node_acl, se_sess, sess);
 755         pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
 756         sess->session_state = TARG_SESS_STATE_LOGGED_IN;
 757 
 758         pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
 759                 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
 760                 tpg->tpgt);
 761 
 762         spin_lock_bh(&sess->conn_lock);
 763         list_add_tail(&conn->conn_list, &sess->sess_conn_list);
 764         atomic_inc(&sess->nconn);
 765         pr_debug("Incremented iSCSI Connection count to %hu from node:"
 766                 " %s\n", atomic_read(&sess->nconn),
 767                 sess->sess_ops->InitiatorName);
 768         spin_unlock_bh(&sess->conn_lock);
 769 
 770         sess->sid = tpg->sid++;
 771         if (!sess->sid)
 772                 sess->sid = tpg->sid++;
 773         pr_debug("Established iSCSI session from node: %s\n",
 774                         sess->sess_ops->InitiatorName);
 775 
 776         tpg->nsessions++;
 777         if (tpg->tpg_tiqn)
 778                 tpg->tpg_tiqn->tiqn_nsessions++;
 779 
 780         pr_debug("Incremented number of active iSCSI sessions to %u on"
 781                 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
 782         spin_unlock_bh(&se_tpg->session_lock);
 783 
 784         iscsi_post_login_start_timers(conn);
 785         /*
 786          * Determine CPU mask to ensure connection's RX and TX kthreads
 787          * are scheduled on the same CPU.
 788          */
 789         iscsit_thread_get_cpumask(conn);
 790         conn->conn_rx_reset_cpumask = 1;
 791         conn->conn_tx_reset_cpumask = 1;
 792         /*
 793          * Wakeup the sleeping iscsi_target_rx_thread() now that
 794          * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
 795          */
 796         complete(&conn->rx_login_comp);
 797         iscsit_dec_conn_usage_count(conn);
 798 }
 799 
 800 void iscsi_handle_login_thread_timeout(struct timer_list *t)
 801 {
 802         struct iscsi_np *np = from_timer(np, t, np_login_timer);
 803 
 804         spin_lock_bh(&np->np_thread_lock);
 805         pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
 806                         &np->np_sockaddr);
 807 
 808         if (np->np_login_timer_flags & ISCSI_TF_STOP) {
 809                 spin_unlock_bh(&np->np_thread_lock);
 810                 return;
 811         }
 812 
 813         if (np->np_thread)
 814                 send_sig(SIGINT, np->np_thread, 1);
 815 
 816         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 817         spin_unlock_bh(&np->np_thread_lock);
 818 }
 819 
 820 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
 821 {
 822         /*
 823          * This used the TA_LOGIN_TIMEOUT constant because at this
 824          * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
 825          */
 826         spin_lock_bh(&np->np_thread_lock);
 827         np->np_login_timer_flags &= ~ISCSI_TF_STOP;
 828         np->np_login_timer_flags |= ISCSI_TF_RUNNING;
 829         mod_timer(&np->np_login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 830 
 831         pr_debug("Added timeout timer to iSCSI login request for"
 832                         " %u seconds.\n", TA_LOGIN_TIMEOUT);
 833         spin_unlock_bh(&np->np_thread_lock);
 834 }
 835 
 836 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
 837 {
 838         spin_lock_bh(&np->np_thread_lock);
 839         if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
 840                 spin_unlock_bh(&np->np_thread_lock);
 841                 return;
 842         }
 843         np->np_login_timer_flags |= ISCSI_TF_STOP;
 844         spin_unlock_bh(&np->np_thread_lock);
 845 
 846         del_timer_sync(&np->np_login_timer);
 847 
 848         spin_lock_bh(&np->np_thread_lock);
 849         np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
 850         spin_unlock_bh(&np->np_thread_lock);
 851 }
 852 
 853 int iscsit_setup_np(
 854         struct iscsi_np *np,
 855         struct sockaddr_storage *sockaddr)
 856 {
 857         struct socket *sock = NULL;
 858         int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
 859 
 860         switch (np->np_network_transport) {
 861         case ISCSI_TCP:
 862                 np->np_ip_proto = IPPROTO_TCP;
 863                 np->np_sock_type = SOCK_STREAM;
 864                 break;
 865         case ISCSI_SCTP_TCP:
 866                 np->np_ip_proto = IPPROTO_SCTP;
 867                 np->np_sock_type = SOCK_STREAM;
 868                 break;
 869         case ISCSI_SCTP_UDP:
 870                 np->np_ip_proto = IPPROTO_SCTP;
 871                 np->np_sock_type = SOCK_SEQPACKET;
 872                 break;
 873         default:
 874                 pr_err("Unsupported network_transport: %d\n",
 875                                 np->np_network_transport);
 876                 return -EINVAL;
 877         }
 878 
 879         ret = sock_create(sockaddr->ss_family, np->np_sock_type,
 880                         np->np_ip_proto, &sock);
 881         if (ret < 0) {
 882                 pr_err("sock_create() failed.\n");
 883                 return ret;
 884         }
 885         np->np_socket = sock;
 886         /*
 887          * Setup the np->np_sockaddr from the passed sockaddr setup
 888          * in iscsi_target_configfs.c code..
 889          */
 890         memcpy(&np->np_sockaddr, sockaddr,
 891                         sizeof(struct sockaddr_storage));
 892 
 893         if (sockaddr->ss_family == AF_INET6)
 894                 len = sizeof(struct sockaddr_in6);
 895         else
 896                 len = sizeof(struct sockaddr_in);
 897         /*
 898          * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
 899          */
 900         /* FIXME: Someone please explain why this is endian-safe */
 901         opt = 1;
 902         if (np->np_network_transport == ISCSI_TCP) {
 903                 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
 904                                 (char *)&opt, sizeof(opt));
 905                 if (ret < 0) {
 906                         pr_err("kernel_setsockopt() for TCP_NODELAY"
 907                                 " failed: %d\n", ret);
 908                         goto fail;
 909                 }
 910         }
 911 
 912         /* FIXME: Someone please explain why this is endian-safe */
 913         ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
 914                         (char *)&opt, sizeof(opt));
 915         if (ret < 0) {
 916                 pr_err("kernel_setsockopt() for SO_REUSEADDR"
 917                         " failed\n");
 918                 goto fail;
 919         }
 920 
 921         ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
 922                         (char *)&opt, sizeof(opt));
 923         if (ret < 0) {
 924                 pr_err("kernel_setsockopt() for IP_FREEBIND"
 925                         " failed\n");
 926                 goto fail;
 927         }
 928 
 929         ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
 930         if (ret < 0) {
 931                 pr_err("kernel_bind() failed: %d\n", ret);
 932                 goto fail;
 933         }
 934 
 935         ret = kernel_listen(sock, backlog);
 936         if (ret != 0) {
 937                 pr_err("kernel_listen() failed: %d\n", ret);
 938                 goto fail;
 939         }
 940 
 941         return 0;
 942 fail:
 943         np->np_socket = NULL;
 944         sock_release(sock);
 945         return ret;
 946 }
 947 
 948 int iscsi_target_setup_login_socket(
 949         struct iscsi_np *np,
 950         struct sockaddr_storage *sockaddr)
 951 {
 952         struct iscsit_transport *t;
 953         int rc;
 954 
 955         t = iscsit_get_transport(np->np_network_transport);
 956         if (!t)
 957                 return -EINVAL;
 958 
 959         rc = t->iscsit_setup_np(np, sockaddr);
 960         if (rc < 0) {
 961                 iscsit_put_transport(t);
 962                 return rc;
 963         }
 964 
 965         np->np_transport = t;
 966         np->enabled = true;
 967         return 0;
 968 }
 969 
 970 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
 971 {
 972         struct socket *new_sock, *sock = np->np_socket;
 973         struct sockaddr_in sock_in;
 974         struct sockaddr_in6 sock_in6;
 975         int rc;
 976 
 977         rc = kernel_accept(sock, &new_sock, 0);
 978         if (rc < 0)
 979                 return rc;
 980 
 981         conn->sock = new_sock;
 982         conn->login_family = np->np_sockaddr.ss_family;
 983 
 984         if (np->np_sockaddr.ss_family == AF_INET6) {
 985                 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
 986 
 987                 rc = conn->sock->ops->getname(conn->sock,
 988                                 (struct sockaddr *)&sock_in6, 1);
 989                 if (rc >= 0) {
 990                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
 991                                 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
 992                         } else {
 993                                 /* Pretend to be an ipv4 socket */
 994                                 sock_in.sin_family = AF_INET;
 995                                 sock_in.sin_port = sock_in6.sin6_port;
 996                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
 997                                 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
 998                         }
 999                 }
1000 
1001                 rc = conn->sock->ops->getname(conn->sock,
1002                                 (struct sockaddr *)&sock_in6, 0);
1003                 if (rc >= 0) {
1004                         if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1005                                 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1006                         } else {
1007                                 /* Pretend to be an ipv4 socket */
1008                                 sock_in.sin_family = AF_INET;
1009                                 sock_in.sin_port = sock_in6.sin6_port;
1010                                 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1011                                 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1012                         }
1013                 }
1014         } else {
1015                 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1016 
1017                 rc = conn->sock->ops->getname(conn->sock,
1018                                 (struct sockaddr *)&sock_in, 1);
1019                 if (rc >= 0)
1020                         memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1021 
1022                 rc = conn->sock->ops->getname(conn->sock,
1023                                 (struct sockaddr *)&sock_in, 0);
1024                 if (rc >= 0)
1025                         memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1026         }
1027 
1028         return 0;
1029 }
1030 
1031 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1032 {
1033         struct iscsi_login_req *login_req;
1034         u32 padding = 0, payload_length;
1035 
1036         if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1037                 return -1;
1038 
1039         login_req = (struct iscsi_login_req *)login->req;
1040         payload_length  = ntoh24(login_req->dlength);
1041         padding = ((-payload_length) & 3);
1042 
1043         pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1044                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1045                 login_req->flags, login_req->itt, login_req->cmdsn,
1046                 login_req->exp_statsn, login_req->cid, payload_length);
1047         /*
1048          * Setup the initial iscsi_login values from the leading
1049          * login request PDU.
1050          */
1051         if (login->first_request) {
1052                 login_req = (struct iscsi_login_req *)login->req;
1053                 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1054                 login->current_stage    = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1055                 login->version_min      = login_req->min_version;
1056                 login->version_max      = login_req->max_version;
1057                 memcpy(login->isid, login_req->isid, 6);
1058                 login->cmd_sn           = be32_to_cpu(login_req->cmdsn);
1059                 login->init_task_tag    = login_req->itt;
1060                 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1061                 login->cid              = be16_to_cpu(login_req->cid);
1062                 login->tsih             = be16_to_cpu(login_req->tsih);
1063         }
1064 
1065         if (iscsi_target_check_login_request(conn, login) < 0)
1066                 return -1;
1067 
1068         memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1069         if (iscsi_login_rx_data(conn, login->req_buf,
1070                                 payload_length + padding) < 0)
1071                 return -1;
1072 
1073         return 0;
1074 }
1075 
1076 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1077                         u32 length)
1078 {
1079         if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1080                 return -1;
1081 
1082         return 0;
1083 }
1084 
1085 static int
1086 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1087 {
1088         int rc;
1089 
1090         if (!t->owner) {
1091                 conn->conn_transport = t;
1092                 return 0;
1093         }
1094 
1095         rc = try_module_get(t->owner);
1096         if (!rc) {
1097                 pr_err("try_module_get() failed for %s\n", t->name);
1098                 return -EINVAL;
1099         }
1100 
1101         conn->conn_transport = t;
1102         return 0;
1103 }
1104 
1105 static struct iscsi_conn *iscsit_alloc_conn(struct iscsi_np *np)
1106 {
1107         struct iscsi_conn *conn;
1108 
1109         conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1110         if (!conn) {
1111                 pr_err("Could not allocate memory for new connection\n");
1112                 return NULL;
1113         }
1114         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1115         conn->conn_state = TARG_CONN_STATE_FREE;
1116 
1117         init_waitqueue_head(&conn->queues_wq);
1118         INIT_LIST_HEAD(&conn->conn_list);
1119         INIT_LIST_HEAD(&conn->conn_cmd_list);
1120         INIT_LIST_HEAD(&conn->immed_queue_list);
1121         INIT_LIST_HEAD(&conn->response_queue_list);
1122         init_completion(&conn->conn_post_wait_comp);
1123         init_completion(&conn->conn_wait_comp);
1124         init_completion(&conn->conn_wait_rcfr_comp);
1125         init_completion(&conn->conn_waiting_on_uc_comp);
1126         init_completion(&conn->conn_logout_comp);
1127         init_completion(&conn->rx_half_close_comp);
1128         init_completion(&conn->tx_half_close_comp);
1129         init_completion(&conn->rx_login_comp);
1130         spin_lock_init(&conn->cmd_lock);
1131         spin_lock_init(&conn->conn_usage_lock);
1132         spin_lock_init(&conn->immed_queue_lock);
1133         spin_lock_init(&conn->nopin_timer_lock);
1134         spin_lock_init(&conn->response_queue_lock);
1135         spin_lock_init(&conn->state_lock);
1136 
1137         timer_setup(&conn->nopin_response_timer,
1138                     iscsit_handle_nopin_response_timeout, 0);
1139         timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1140 
1141         if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1142                 goto free_conn;
1143 
1144         conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1145         if (!conn->conn_ops) {
1146                 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1147                 goto put_transport;
1148         }
1149 
1150         if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1151                 pr_err("Unable to allocate conn->conn_cpumask\n");
1152                 goto free_conn_ops;
1153         }
1154 
1155         return conn;
1156 
1157 free_conn_ops:
1158         kfree(conn->conn_ops);
1159 put_transport:
1160         iscsit_put_transport(conn->conn_transport);
1161 free_conn:
1162         kfree(conn);
1163         return NULL;
1164 }
1165 
1166 void iscsit_free_conn(struct iscsi_conn *conn)
1167 {
1168         free_cpumask_var(conn->conn_cpumask);
1169         kfree(conn->conn_ops);
1170         iscsit_put_transport(conn->conn_transport);
1171         kfree(conn);
1172 }
1173 
1174 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1175                 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1176 {
1177         if (!new_sess)
1178                 goto old_sess_out;
1179 
1180         pr_err("iSCSI Login negotiation failed.\n");
1181         iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1182                                    ISCSI_LOGIN_STATUS_INIT_ERR);
1183         if (!zero_tsih || !conn->sess)
1184                 goto old_sess_out;
1185 
1186         transport_free_session(conn->sess->se_sess);
1187         ida_free(&sess_ida, conn->sess->session_index);
1188         kfree(conn->sess->sess_ops);
1189         kfree(conn->sess);
1190         conn->sess = NULL;
1191 
1192 old_sess_out:
1193         iscsi_stop_login_thread_timer(np);
1194         /*
1195          * If login negotiation fails check if the Time2Retain timer
1196          * needs to be restarted.
1197          */
1198         if (!zero_tsih && conn->sess) {
1199                 spin_lock_bh(&conn->sess->conn_lock);
1200                 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1201                         struct se_portal_group *se_tpg =
1202                                         &conn->tpg->tpg_se_tpg;
1203 
1204                         atomic_set(&conn->sess->session_continuation, 0);
1205                         spin_unlock_bh(&conn->sess->conn_lock);
1206                         spin_lock_bh(&se_tpg->session_lock);
1207                         iscsit_start_time2retain_handler(conn->sess);
1208                         spin_unlock_bh(&se_tpg->session_lock);
1209                 } else
1210                         spin_unlock_bh(&conn->sess->conn_lock);
1211                 iscsit_dec_session_usage_count(conn->sess);
1212         }
1213 
1214         ahash_request_free(conn->conn_tx_hash);
1215         if (conn->conn_rx_hash) {
1216                 struct crypto_ahash *tfm;
1217 
1218                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1219                 ahash_request_free(conn->conn_rx_hash);
1220                 crypto_free_ahash(tfm);
1221         }
1222 
1223         if (conn->param_list) {
1224                 iscsi_release_param_list(conn->param_list);
1225                 conn->param_list = NULL;
1226         }
1227         iscsi_target_nego_release(conn);
1228 
1229         if (conn->sock) {
1230                 sock_release(conn->sock);
1231                 conn->sock = NULL;
1232         }
1233 
1234         if (conn->conn_transport->iscsit_wait_conn)
1235                 conn->conn_transport->iscsit_wait_conn(conn);
1236 
1237         if (conn->conn_transport->iscsit_free_conn)
1238                 conn->conn_transport->iscsit_free_conn(conn);
1239 
1240         iscsit_free_conn(conn);
1241 }
1242 
1243 static int __iscsi_target_login_thread(struct iscsi_np *np)
1244 {
1245         u8 *buffer, zero_tsih = 0;
1246         int ret = 0, rc;
1247         struct iscsi_conn *conn = NULL;
1248         struct iscsi_login *login;
1249         struct iscsi_portal_group *tpg = NULL;
1250         struct iscsi_login_req *pdu;
1251         struct iscsi_tpg_np *tpg_np;
1252         bool new_sess = false;
1253 
1254         flush_signals(current);
1255 
1256         spin_lock_bh(&np->np_thread_lock);
1257         if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1258                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1259                 spin_unlock_bh(&np->np_thread_lock);
1260                 complete(&np->np_restart_comp);
1261                 return 1;
1262         } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1263                 spin_unlock_bh(&np->np_thread_lock);
1264                 goto exit;
1265         } else {
1266                 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1267         }
1268         spin_unlock_bh(&np->np_thread_lock);
1269 
1270         conn = iscsit_alloc_conn(np);
1271         if (!conn) {
1272                 /* Get another socket */
1273                 return 1;
1274         }
1275 
1276         rc = np->np_transport->iscsit_accept_np(np, conn);
1277         if (rc == -ENOSYS) {
1278                 complete(&np->np_restart_comp);
1279                 iscsit_free_conn(conn);
1280                 goto exit;
1281         } else if (rc < 0) {
1282                 spin_lock_bh(&np->np_thread_lock);
1283                 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1284                         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1285                         spin_unlock_bh(&np->np_thread_lock);
1286                         complete(&np->np_restart_comp);
1287                         iscsit_free_conn(conn);
1288                         /* Get another socket */
1289                         return 1;
1290                 }
1291                 spin_unlock_bh(&np->np_thread_lock);
1292                 iscsit_free_conn(conn);
1293                 return 1;
1294         }
1295         /*
1296          * Perform the remaining iSCSI connection initialization items..
1297          */
1298         login = iscsi_login_init_conn(conn);
1299         if (!login) {
1300                 goto new_sess_out;
1301         }
1302 
1303         iscsi_start_login_thread_timer(np);
1304 
1305         pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1306         conn->conn_state = TARG_CONN_STATE_XPT_UP;
1307         /*
1308          * This will process the first login request + payload..
1309          */
1310         rc = np->np_transport->iscsit_get_login_rx(conn, login);
1311         if (rc == 1)
1312                 return 1;
1313         else if (rc < 0)
1314                 goto new_sess_out;
1315 
1316         buffer = &login->req[0];
1317         pdu = (struct iscsi_login_req *)buffer;
1318         /*
1319          * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1320          * when Status-Class != 0.
1321         */
1322         conn->login_itt = pdu->itt;
1323 
1324         spin_lock_bh(&np->np_thread_lock);
1325         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1326                 spin_unlock_bh(&np->np_thread_lock);
1327                 pr_err("iSCSI Network Portal on %pISpc currently not"
1328                         " active.\n", &np->np_sockaddr);
1329                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1330                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1331                 goto new_sess_out;
1332         }
1333         spin_unlock_bh(&np->np_thread_lock);
1334 
1335         conn->network_transport = np->np_network_transport;
1336 
1337         pr_debug("Received iSCSI login request from %pISpc on %s Network"
1338                 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1339                 &conn->local_sockaddr);
1340 
1341         pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1342         conn->conn_state        = TARG_CONN_STATE_IN_LOGIN;
1343 
1344         if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1345                         pdu->min_version) < 0)
1346                 goto new_sess_out;
1347 
1348         zero_tsih = (pdu->tsih == 0x0000);
1349         if (zero_tsih) {
1350                 /*
1351                  * This is the leading connection of a new session.
1352                  * We wait until after authentication to check for
1353                  * session reinstatement.
1354                  */
1355                 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1356                         goto new_sess_out;
1357         } else {
1358                 /*
1359                  * Add a new connection to an existing session.
1360                  * We check for a non-existant session in
1361                  * iscsi_login_non_zero_tsih_s2() below based
1362                  * on ISID/TSIH, but wait until after authentication
1363                  * to check for connection reinstatement, etc.
1364                  */
1365                 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1366                         goto new_sess_out;
1367         }
1368         /*
1369          * SessionType: Discovery
1370          *
1371          *      Locates Default Portal
1372          *
1373          * SessionType: Normal
1374          *
1375          *      Locates Target Portal from NP -> Target IQN
1376          */
1377         rc = iscsi_target_locate_portal(np, conn, login);
1378         if (rc < 0) {
1379                 tpg = conn->tpg;
1380                 goto new_sess_out;
1381         }
1382         login->zero_tsih = zero_tsih;
1383 
1384         if (conn->sess)
1385                 conn->sess->se_sess->sup_prot_ops =
1386                         conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1387 
1388         tpg = conn->tpg;
1389         if (!tpg) {
1390                 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1391                 goto new_sess_out;
1392         }
1393 
1394         if (zero_tsih) {
1395                 if (iscsi_login_zero_tsih_s2(conn) < 0)
1396                         goto new_sess_out;
1397         } else {
1398                 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1399                         goto old_sess_out;
1400         }
1401 
1402         if (conn->conn_transport->iscsit_validate_params) {
1403                 ret = conn->conn_transport->iscsit_validate_params(conn);
1404                 if (ret < 0) {
1405                         if (zero_tsih)
1406                                 goto new_sess_out;
1407                         else
1408                                 goto old_sess_out;
1409                 }
1410         }
1411 
1412         ret = iscsi_target_start_negotiation(login, conn);
1413         if (ret < 0)
1414                 goto new_sess_out;
1415 
1416         iscsi_stop_login_thread_timer(np);
1417 
1418         if (ret == 1) {
1419                 tpg_np = conn->tpg_np;
1420 
1421                 iscsi_post_login_handler(np, conn, zero_tsih);
1422                 iscsit_deaccess_np(np, tpg, tpg_np);
1423         }
1424 
1425         tpg = NULL;
1426         tpg_np = NULL;
1427         /* Get another socket */
1428         return 1;
1429 
1430 new_sess_out:
1431         new_sess = true;
1432 old_sess_out:
1433         tpg_np = conn->tpg_np;
1434         iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1435         new_sess = false;
1436 
1437         if (tpg) {
1438                 iscsit_deaccess_np(np, tpg, tpg_np);
1439                 tpg = NULL;
1440                 tpg_np = NULL;
1441         }
1442 
1443         return 1;
1444 
1445 exit:
1446         iscsi_stop_login_thread_timer(np);
1447         spin_lock_bh(&np->np_thread_lock);
1448         np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1449         spin_unlock_bh(&np->np_thread_lock);
1450 
1451         return 0;
1452 }
1453 
1454 int iscsi_target_login_thread(void *arg)
1455 {
1456         struct iscsi_np *np = arg;
1457         int ret;
1458 
1459         allow_signal(SIGINT);
1460 
1461         while (1) {
1462                 ret = __iscsi_target_login_thread(np);
1463                 /*
1464                  * We break and exit here unless another sock_accept() call
1465                  * is expected.
1466                  */
1467                 if (ret != 1)
1468                         break;
1469         }
1470 
1471         while (!kthread_should_stop()) {
1472                 msleep(100);
1473         }
1474 
1475         return 0;
1476 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/target/iscsi/iscsi_target_login.c

DEFINITIONS
