drivers/target/iscsi/iscsi_target_nego.c

   1 /*******************************************************************************
   2  * This file contains main functions related to iSCSI Parameter negotiation.
   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 <linux/ctype.h>
  20 #include <linux/kthread.h>
  21 #include <linux/slab.h>
  22 #include <linux/sched/signal.h>
  23 #include <net/sock.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <target/target_core_base.h>
  26 #include <target/target_core_fabric.h>
  27 #include <target/iscsi/iscsi_transport.h>
  28
  29 #include <target/iscsi/iscsi_target_core.h>
  30 #include "iscsi_target_parameters.h"
  31 #include "iscsi_target_login.h"
  32 #include "iscsi_target_nego.h"
  33 #include "iscsi_target_tpg.h"
  34 #include "iscsi_target_util.h"
  35 #include "iscsi_target.h"
  36 #include "iscsi_target_auth.h"
  37
  38 #define MAX_LOGIN_PDUS  7
  39 #define TEXT_LEN        4096
  40
  41 void convert_null_to_semi(char *buf, int len)
  42 {
  43         int i;
  44
  45         for (i = 0; i < len; i++)
  46                 if (buf[i] == '\0')
  47                         buf[i] = ';';
  48 }
  49
  50 static int strlen_semi(char *buf)
  51 {
  52         int i = 0;
  53
  54         while (buf[i] != '\0') {
  55                 if (buf[i] == ';')
  56                         return i;
  57                 i++;
  58         }
  59
  60         return -1;
  61 }
  62
  63 int extract_param(
  64         const char *in_buf,
  65         const char *pattern,
  66         unsigned int max_length,
  67         char *out_buf,
  68         unsigned char *type)
  69 {
  70         char *ptr;
  71         int len;
  72
  73         if (!in_buf || !pattern || !out_buf || !type)
  74                 return -1;
  75
  76         ptr = strstr(in_buf, pattern);
  77         if (!ptr)
  78                 return -1;
  79
  80         ptr = strstr(ptr, "=");
  81         if (!ptr)
  82                 return -1;
  83
  84         ptr += 1;
  85         if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
  86                 ptr += 2; /* skip 0x */
  87                 *type = HEX;
  88         } else
  89                 *type = DECIMAL;
  90
  91         len = strlen_semi(ptr);
  92         if (len < 0)
  93                 return -1;
  94
  95         if (len >= max_length) {
  96                 pr_err("Length of input: %d exceeds max_length:"
  97                         " %d\n", len, max_length);
  98                 return -1;
  99         }
 100         memcpy(out_buf, ptr, len);
 101         out_buf[len] = '\0';
 102
 103         return 0;
 104 }
 105
 106 static u32 iscsi_handle_authentication(
 107         struct iscsi_conn *conn,
 108         char *in_buf,
 109         char *out_buf,
 110         int in_length,
 111         int *out_length,
 112         unsigned char *authtype)
 113 {
 114         struct iscsi_session *sess = conn->sess;
 115         struct iscsi_node_auth *auth;
 116         struct iscsi_node_acl *iscsi_nacl;
 117         struct iscsi_portal_group *iscsi_tpg;
 118         struct se_node_acl *se_nacl;
 119
 120         if (!sess->sess_ops->SessionType) {
 121                 /*
 122                  * For SessionType=Normal
 123                  */
 124                 se_nacl = conn->sess->se_sess->se_node_acl;
 125                 if (!se_nacl) {
 126                         pr_err("Unable to locate struct se_node_acl for"
 127                                         " CHAP auth\n");
 128                         return -1;
 129                 }
 130                 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 131                                 se_node_acl);
 132                 if (!iscsi_nacl) {
 133                         pr_err("Unable to locate struct iscsi_node_acl for"
 134                                         " CHAP auth\n");
 135                         return -1;
 136                 }
 137
 138                 if (se_nacl->dynamic_node_acl) {
 139                         iscsi_tpg = container_of(se_nacl->se_tpg,
 140                                         struct iscsi_portal_group, tpg_se_tpg);
 141
 142                         auth = &iscsi_tpg->tpg_demo_auth;
 143                 } else {
 144                         iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 145                                                   se_node_acl);
 146
 147                         auth = &iscsi_nacl->node_auth;
 148                 }
 149         } else {
 150                 /*
 151                  * For SessionType=Discovery
 152                  */
 153                 auth = &iscsit_global->discovery_acl.node_auth;
 154         }
 155
 156         if (strstr("CHAP", authtype))
 157                 strcpy(conn->sess->auth_type, "CHAP");
 158         else
 159                 strcpy(conn->sess->auth_type, NONE);
 160
 161         if (strstr("None", authtype))
 162                 return 1;
 163 #ifdef CANSRP
 164         else if (strstr("SRP", authtype))
 165                 return srp_main_loop(conn, auth, in_buf, out_buf,
 166                                 &in_length, out_length);
 167 #endif
 168         else if (strstr("CHAP", authtype))
 169                 return chap_main_loop(conn, auth, in_buf, out_buf,
 170                                 &in_length, out_length);
 171         else if (strstr("SPKM1", authtype))
 172                 return 2;
 173         else if (strstr("SPKM2", authtype))
 174                 return 2;
 175         else if (strstr("KRB5", authtype))
 176                 return 2;
 177         else
 178                 return 2;
 179 }
 180
 181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
 182 {
 183         kfree(conn->auth_protocol);
 184 }
 185
 186 int iscsi_target_check_login_request(
 187         struct iscsi_conn *conn,
 188         struct iscsi_login *login)
 189 {
 190         int req_csg, req_nsg;
 191         u32 payload_length;
 192         struct iscsi_login_req *login_req;
 193
 194         login_req = (struct iscsi_login_req *) login->req;
 195         payload_length = ntoh24(login_req->dlength);
 196
 197         switch (login_req->opcode & ISCSI_OPCODE_MASK) {
 198         case ISCSI_OP_LOGIN:
 199                 break;
 200         default:
 201                 pr_err("Received unknown opcode 0x%02x.\n",
 202                                 login_req->opcode & ISCSI_OPCODE_MASK);
 203                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 204                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 205                 return -1;
 206         }
 207
 208         if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
 209             (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 210                 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
 211                         " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
 212                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 213                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 214                 return -1;
 215         }
 216
 217         req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
 218         req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 219
 220         if (req_csg != login->current_stage) {
 221                 pr_err("Initiator unexpectedly changed login stage"
 222                         " from %d to %d, login failed.\n", login->current_stage,
 223                         req_csg);
 224                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 225                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 226                 return -1;
 227         }
 228
 229         if ((req_nsg == 2) || (req_csg >= 2) ||
 230            ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
 231             (req_nsg <= req_csg))) {
 232                 pr_err("Illegal login_req->flags Combination, CSG: %d,"
 233                         " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
 234                         req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
 235                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 236                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 237                 return -1;
 238         }
 239
 240         if ((login_req->max_version != login->version_max) ||
 241             (login_req->min_version != login->version_min)) {
 242                 pr_err("Login request changed Version Max/Nin"
 243                         " unexpectedly to 0x%02x/0x%02x, protocol error\n",
 244                         login_req->max_version, login_req->min_version);
 245                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 246                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 247                 return -1;
 248         }
 249
 250         if (memcmp(login_req->isid, login->isid, 6) != 0) {
 251                 pr_err("Login request changed ISID unexpectedly,"
 252                                 " protocol error.\n");
 253                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 254                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 255                 return -1;
 256         }
 257
 258         if (login_req->itt != login->init_task_tag) {
 259                 pr_err("Login request changed ITT unexpectedly to"
 260                         " 0x%08x, protocol error.\n", login_req->itt);
 261                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 262                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 263                 return -1;
 264         }
 265
 266         if (payload_length > MAX_KEY_VALUE_PAIRS) {
 267                 pr_err("Login request payload exceeds default"
 268                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 269                                 MAX_KEY_VALUE_PAIRS);
 270                 return -1;
 271         }
 272
 273         return 0;
 274 }
 275 EXPORT_SYMBOL(iscsi_target_check_login_request);
 276
 277 static int iscsi_target_check_first_request(
 278         struct iscsi_conn *conn,
 279         struct iscsi_login *login)
 280 {
 281         struct iscsi_param *param = NULL;
 282         struct se_node_acl *se_nacl;
 283
 284         login->first_request = 0;
 285
 286         list_for_each_entry(param, &conn->param_list->param_list, p_list) {
 287                 if (!strncmp(param->name, SESSIONTYPE, 11)) {
 288                         if (!IS_PSTATE_ACCEPTOR(param)) {
 289                                 pr_err("SessionType key not received"
 290                                         " in first login request.\n");
 291                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 292                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 293                                 return -1;
 294                         }
 295                         if (!strncmp(param->value, DISCOVERY, 9))
 296                                 return 0;
 297                 }
 298
 299                 if (!strncmp(param->name, INITIATORNAME, 13)) {
 300                         if (!IS_PSTATE_ACCEPTOR(param)) {
 301                                 if (!login->leading_connection)
 302                                         continue;
 303
 304                                 pr_err("InitiatorName key not received"
 305                                         " in first login request.\n");
 306                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 307                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 308                                 return -1;
 309                         }
 310
 311                         /*
 312                          * For non-leading connections, double check that the
 313                          * received InitiatorName matches the existing session's
 314                          * struct iscsi_node_acl.
 315                          */
 316                         if (!login->leading_connection) {
 317                                 se_nacl = conn->sess->se_sess->se_node_acl;
 318                                 if (!se_nacl) {
 319                                         pr_err("Unable to locate"
 320                                                 " struct se_node_acl\n");
 321                                         iscsit_tx_login_rsp(conn,
 322                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 323                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 324                                         return -1;
 325                                 }
 326
 327                                 if (strcmp(param->value,
 328                                                 se_nacl->initiatorname)) {
 329                                         pr_err("Incorrect"
 330                                                 " InitiatorName: %s for this"
 331                                                 " iSCSI Initiator Node.\n",
 332                                                 param->value);
 333                                         iscsit_tx_login_rsp(conn,
 334                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 335                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 336                                         return -1;
 337                                 }
 338                         }
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 346 {
 347         u32 padding = 0;
 348         struct iscsi_login_rsp *login_rsp;
 349
 350         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 351
 352         login_rsp->opcode               = ISCSI_OP_LOGIN_RSP;
 353         hton24(login_rsp->dlength, login->rsp_length);
 354         memcpy(login_rsp->isid, login->isid, 6);
 355         login_rsp->tsih                 = cpu_to_be16(login->tsih);
 356         login_rsp->itt                  = login->init_task_tag;
 357         login_rsp->statsn               = cpu_to_be32(conn->stat_sn++);
 358         login_rsp->exp_cmdsn            = cpu_to_be32(conn->sess->exp_cmd_sn);
 359         login_rsp->max_cmdsn            = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
 360
 361         pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
 362                 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
 363                 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
 364                 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
 365                 ntohl(login_rsp->statsn), login->rsp_length);
 366
 367         padding = ((-login->rsp_length) & 3);
 368         /*
 369          * Before sending the last login response containing the transition
 370          * bit for full-feature-phase, go ahead and start up TX/RX threads
 371          * now to avoid potential resource allocation failures after the
 372          * final login response has been sent.
 373          */
 374         if (login->login_complete) {
 375                 int rc = iscsit_start_kthreads(conn);
 376                 if (rc) {
 377                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 378                                             ISCSI_LOGIN_STATUS_NO_RESOURCES);
 379                         return -1;
 380                 }
 381         }
 382
 383         if (conn->conn_transport->iscsit_put_login_tx(conn, login,
 384                                         login->rsp_length + padding) < 0)
 385                 goto err;
 386
 387         login->rsp_length               = 0;
 388
 389         return 0;
 390
 391 err:
 392         if (login->login_complete) {
 393                 if (conn->rx_thread && conn->rx_thread_active) {
 394                         send_sig(SIGINT, conn->rx_thread, 1);
 395                         complete(&conn->rx_login_comp);
 396                         kthread_stop(conn->rx_thread);
 397                 }
 398                 if (conn->tx_thread && conn->tx_thread_active) {
 399                         send_sig(SIGINT, conn->tx_thread, 1);
 400                         kthread_stop(conn->tx_thread);
 401                 }
 402                 spin_lock(&iscsit_global->ts_bitmap_lock);
 403                 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 404                                       get_order(1));
 405                 spin_unlock(&iscsit_global->ts_bitmap_lock);
 406         }
 407         return -1;
 408 }
 409
 410 static void iscsi_target_sk_data_ready(struct sock *sk)
 411 {
 412         struct iscsi_conn *conn = sk->sk_user_data;
 413         bool rc;
 414
 415         pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 416
 417         write_lock_bh(&sk->sk_callback_lock);
 418         if (!sk->sk_user_data) {
 419                 write_unlock_bh(&sk->sk_callback_lock);
 420                 return;
 421         }
 422         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 423                 write_unlock_bh(&sk->sk_callback_lock);
 424                 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
 425                 return;
 426         }
 427         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 428                 write_unlock_bh(&sk->sk_callback_lock);
 429                 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
 430                 return;
 431         }
 432         if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 433                 write_unlock_bh(&sk->sk_callback_lock);
 434                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
 435                 return;
 436         }
 437
 438         rc = schedule_delayed_work(&conn->login_work, 0);
 439         if (!rc) {
 440                 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
 441                          " got false\n");
 442         }
 443         write_unlock_bh(&sk->sk_callback_lock);
 444 }
 445
 446 static void iscsi_target_sk_state_change(struct sock *);
 447
 448 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
 449 {
 450         struct sock *sk;
 451
 452         if (!conn->sock)
 453                 return;
 454
 455         sk = conn->sock->sk;
 456         pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
 457
 458         write_lock_bh(&sk->sk_callback_lock);
 459         sk->sk_user_data = conn;
 460         conn->orig_data_ready = sk->sk_data_ready;
 461         conn->orig_state_change = sk->sk_state_change;
 462         sk->sk_data_ready = iscsi_target_sk_data_ready;
 463         sk->sk_state_change = iscsi_target_sk_state_change;
 464         write_unlock_bh(&sk->sk_callback_lock);
 465
 466         sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
 467         sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
 468 }
 469
 470 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
 471 {
 472         struct sock *sk;
 473
 474         if (!conn->sock)
 475                 return;
 476
 477         sk = conn->sock->sk;
 478         pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
 479
 480         write_lock_bh(&sk->sk_callback_lock);
 481         if (!sk->sk_user_data) {
 482                 write_unlock_bh(&sk->sk_callback_lock);
 483                 return;
 484         }
 485         sk->sk_user_data = NULL;
 486         sk->sk_data_ready = conn->orig_data_ready;
 487         sk->sk_state_change = conn->orig_state_change;
 488         write_unlock_bh(&sk->sk_callback_lock);
 489
 490         sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
 491         sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
 492 }
 493
 494 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
 495
 496 static bool iscsi_target_sk_state_check(struct sock *sk)
 497 {
 498         if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
 499                 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
 500                         "returning FALSE\n");
 501                 return false;
 502         }
 503         return true;
 504 }
 505
 506 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
 507 {
 508         struct iscsi_np *np = login->np;
 509         bool zero_tsih = login->zero_tsih;
 510
 511         iscsi_remove_failed_auth_entry(conn);
 512         iscsi_target_nego_release(conn);
 513         iscsi_target_login_sess_out(conn, np, zero_tsih, true);
 514 }
 515
 516 static void iscsi_target_login_timeout(unsigned long data)
 517 {
 518         struct iscsi_conn *conn = (struct iscsi_conn *)data;
 519
 520         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 521
 522         if (conn->login_kworker) {
 523                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 524                          conn->login_kworker->comm, conn->login_kworker->pid);
 525                 send_sig(SIGINT, conn->login_kworker, 1);
 526         }
 527 }
 528
 529 static void iscsi_target_do_login_rx(struct work_struct *work)
 530 {
 531         struct iscsi_conn *conn = container_of(work,
 532                                 struct iscsi_conn, login_work.work);
 533         struct iscsi_login *login = conn->login;
 534         struct iscsi_np *np = login->np;
 535         struct iscsi_portal_group *tpg = conn->tpg;
 536         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 537         struct timer_list login_timer;
 538         int rc, zero_tsih = login->zero_tsih;
 539         bool state;
 540
 541         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 542                         conn, current->comm, current->pid);
 543
 544         spin_lock(&tpg->tpg_state_lock);
 545         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 546         spin_unlock(&tpg->tpg_state_lock);
 547
 548         if (!state) {
 549                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 550                 iscsi_target_restore_sock_callbacks(conn);
 551                 iscsi_target_login_drop(conn, login);
 552                 iscsit_deaccess_np(np, tpg, tpg_np);
 553                 return;
 554         }
 555
 556         if (conn->sock) {
 557                 struct sock *sk = conn->sock->sk;
 558
 559                 read_lock_bh(&sk->sk_callback_lock);
 560                 state = iscsi_target_sk_state_check(sk);
 561                 read_unlock_bh(&sk->sk_callback_lock);
 562
 563                 if (!state) {
 564                         pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 565                         iscsi_target_restore_sock_callbacks(conn);
 566                         iscsi_target_login_drop(conn, login);
 567                         iscsit_deaccess_np(np, tpg, tpg_np);
 568                         return;
 569                 }
 570         }
 571
 572         conn->login_kworker = current;
 573         allow_signal(SIGINT);
 574
 575         init_timer(&login_timer);
 576         login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 577         login_timer.data = (unsigned long)conn;
 578         login_timer.function = iscsi_target_login_timeout;
 579         add_timer(&login_timer);
 580         pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
 581
 582         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 583         del_timer_sync(&login_timer);
 584         flush_signals(current);
 585         conn->login_kworker = NULL;
 586
 587         if (rc < 0) {
 588                 iscsi_target_restore_sock_callbacks(conn);
 589                 iscsi_target_login_drop(conn, login);
 590                 iscsit_deaccess_np(np, tpg, tpg_np);
 591                 return;
 592         }
 593
 594         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 595                         conn, current->comm, current->pid);
 596
 597         rc = iscsi_target_do_login(conn, login);
 598         if (rc < 0) {
 599                 iscsi_target_restore_sock_callbacks(conn);
 600                 iscsi_target_login_drop(conn, login);
 601                 iscsit_deaccess_np(np, tpg, tpg_np);
 602         } else if (!rc) {
 603                 if (conn->sock) {
 604                         struct sock *sk = conn->sock->sk;
 605
 606                         write_lock_bh(&sk->sk_callback_lock);
 607                         clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
 608                         write_unlock_bh(&sk->sk_callback_lock);
 609                 }
 610         } else if (rc == 1) {
 611                 iscsi_target_nego_release(conn);
 612                 iscsi_post_login_handler(np, conn, zero_tsih);
 613                 iscsit_deaccess_np(np, tpg, tpg_np);
 614         }
 615 }
 616
 617 static void iscsi_target_do_cleanup(struct work_struct *work)
 618 {
 619         struct iscsi_conn *conn = container_of(work,
 620                                 struct iscsi_conn, login_cleanup_work.work);
 621         struct sock *sk = conn->sock->sk;
 622         struct iscsi_login *login = conn->login;
 623         struct iscsi_np *np = login->np;
 624         struct iscsi_portal_group *tpg = conn->tpg;
 625         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 626
 627         pr_debug("Entering iscsi_target_do_cleanup\n");
 628
 629         cancel_delayed_work_sync(&conn->login_work);
 630         conn->orig_state_change(sk);
 631
 632         iscsi_target_restore_sock_callbacks(conn);
 633         iscsi_target_login_drop(conn, login);
 634         iscsit_deaccess_np(np, tpg, tpg_np);
 635
 636         pr_debug("iscsi_target_do_cleanup done()\n");
 637 }
 638
 639 static void iscsi_target_sk_state_change(struct sock *sk)
 640 {
 641         struct iscsi_conn *conn;
 642         void (*orig_state_change)(struct sock *);
 643         bool state;
 644
 645         pr_debug("Entering iscsi_target_sk_state_change\n");
 646
 647         write_lock_bh(&sk->sk_callback_lock);
 648         conn = sk->sk_user_data;
 649         if (!conn) {
 650                 write_unlock_bh(&sk->sk_callback_lock);
 651                 return;
 652         }
 653         orig_state_change = conn->orig_state_change;
 654
 655         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 656                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 657                          conn);
 658                 write_unlock_bh(&sk->sk_callback_lock);
 659                 orig_state_change(sk);
 660                 return;
 661         }
 662         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 663                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 664                          " conn: %p\n", conn);
 665                 write_unlock_bh(&sk->sk_callback_lock);
 666                 orig_state_change(sk);
 667                 return;
 668         }
 669         if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 670                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 671                          conn);
 672                 write_unlock_bh(&sk->sk_callback_lock);
 673                 orig_state_change(sk);
 674                 return;
 675         }
 676
 677         state = iscsi_target_sk_state_check(sk);
 678         write_unlock_bh(&sk->sk_callback_lock);
 679
 680         pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
 681
 682         if (!state) {
 683                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 684                 schedule_delayed_work(&conn->login_cleanup_work, 0);
 685                 return;
 686         }
 687         orig_state_change(sk);
 688 }
 689
 690 /*
 691  *      NOTE: We check for existing sessions or connections AFTER the initiator
 692  *      has been successfully authenticated in order to protect against faked
 693  *      ISID/TSIH combinations.
 694  */
 695 static int iscsi_target_check_for_existing_instances(
 696         struct iscsi_conn *conn,
 697         struct iscsi_login *login)
 698 {
 699         if (login->checked_for_existing)
 700                 return 0;
 701
 702         login->checked_for_existing = 1;
 703
 704         if (!login->tsih)
 705                 return iscsi_check_for_session_reinstatement(conn);
 706         else
 707                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 708                                 login->initial_exp_statsn);
 709 }
 710
 711 static int iscsi_target_do_authentication(
 712         struct iscsi_conn *conn,
 713         struct iscsi_login *login)
 714 {
 715         int authret;
 716         u32 payload_length;
 717         struct iscsi_param *param;
 718         struct iscsi_login_req *login_req;
 719         struct iscsi_login_rsp *login_rsp;
 720
 721         login_req = (struct iscsi_login_req *) login->req;
 722         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 723         payload_length = ntoh24(login_req->dlength);
 724
 725         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 726         if (!param)
 727                 return -1;
 728
 729         authret = iscsi_handle_authentication(
 730                         conn,
 731                         login->req_buf,
 732                         login->rsp_buf,
 733                         payload_length,
 734                         &login->rsp_length,
 735                         param->value);
 736         switch (authret) {
 737         case 0:
 738                 pr_debug("Received OK response"
 739                 " from LIO Authentication, continuing.\n");
 740                 break;
 741         case 1:
 742                 pr_debug("iSCSI security negotiation"
 743                         " completed successfully.\n");
 744                 login->auth_complete = 1;
 745                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 746                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 747                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 748                                              ISCSI_FLAG_LOGIN_TRANSIT);
 749                         login->current_stage = 1;
 750                 }
 751                 return iscsi_target_check_for_existing_instances(
 752                                 conn, login);
 753         case 2:
 754                 pr_err("Security negotiation"
 755                         " failed.\n");
 756                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 757                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 758                 return -1;
 759         default:
 760                 pr_err("Received unknown error %d from LIO"
 761                                 " Authentication\n", authret);
 762                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 763                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 764                 return -1;
 765         }
 766
 767         return 0;
 768 }
 769
 770 static int iscsi_target_handle_csg_zero(
 771         struct iscsi_conn *conn,
 772         struct iscsi_login *login)
 773 {
 774         int ret;
 775         u32 payload_length;
 776         struct iscsi_param *param;
 777         struct iscsi_login_req *login_req;
 778         struct iscsi_login_rsp *login_rsp;
 779
 780         login_req = (struct iscsi_login_req *) login->req;
 781         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 782         payload_length = ntoh24(login_req->dlength);
 783
 784         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 785         if (!param)
 786                 return -1;
 787
 788         ret = iscsi_decode_text_input(
 789                         PHASE_SECURITY|PHASE_DECLARATIVE,
 790                         SENDER_INITIATOR|SENDER_RECEIVER,
 791                         login->req_buf,
 792                         payload_length,
 793                         conn);
 794         if (ret < 0)
 795                 return -1;
 796
 797         if (ret > 0) {
 798                 if (login->auth_complete) {
 799                         pr_err("Initiator has already been"
 800                                 " successfully authenticated, but is still"
 801                                 " sending %s keys.\n", param->value);
 802                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 803                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 804                         return -1;
 805                 }
 806
 807                 goto do_auth;
 808         } else if (!payload_length) {
 809                 pr_err("Initiator sent zero length security payload,"
 810                        " login failed\n");
 811                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 812                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 813                 return -1;
 814         }
 815
 816         if (login->first_request)
 817                 if (iscsi_target_check_first_request(conn, login) < 0)
 818                         return -1;
 819
 820         ret = iscsi_encode_text_output(
 821                         PHASE_SECURITY|PHASE_DECLARATIVE,
 822                         SENDER_TARGET,
 823                         login->rsp_buf,
 824                         &login->rsp_length,
 825                         conn->param_list);
 826         if (ret < 0)
 827                 return -1;
 828
 829         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 830                 if (conn->tpg->tpg_attrib.authentication &&
 831                     !strncmp(param->value, NONE, 4)) {
 832                         pr_err("Initiator sent AuthMethod=None but"
 833                                 " Target is enforcing iSCSI Authentication,"
 834                                         " login failed.\n");
 835                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 836                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 837                         return -1;
 838                 }
 839
 840                 if (conn->tpg->tpg_attrib.authentication &&
 841                     !login->auth_complete)
 842                         return 0;
 843
 844                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 845                         return 0;
 846
 847                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 848                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 849                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 850                                             ISCSI_FLAG_LOGIN_TRANSIT;
 851                         login->current_stage = 1;
 852                 }
 853         }
 854
 855         return 0;
 856 do_auth:
 857         return iscsi_target_do_authentication(conn, login);
 858 }
 859
 860 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 861 {
 862         int ret;
 863         u32 payload_length;
 864         struct iscsi_login_req *login_req;
 865         struct iscsi_login_rsp *login_rsp;
 866
 867         login_req = (struct iscsi_login_req *) login->req;
 868         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 869         payload_length = ntoh24(login_req->dlength);
 870
 871         ret = iscsi_decode_text_input(
 872                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 873                         SENDER_INITIATOR|SENDER_RECEIVER,
 874                         login->req_buf,
 875                         payload_length,
 876                         conn);
 877         if (ret < 0) {
 878                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 879                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 880                 return -1;
 881         }
 882
 883         if (login->first_request)
 884                 if (iscsi_target_check_first_request(conn, login) < 0)
 885                         return -1;
 886
 887         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 888                 return -1;
 889
 890         ret = iscsi_encode_text_output(
 891                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 892                         SENDER_TARGET,
 893                         login->rsp_buf,
 894                         &login->rsp_length,
 895                         conn->param_list);
 896         if (ret < 0) {
 897                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 898                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 899                 return -1;
 900         }
 901
 902         if (!login->auth_complete &&
 903              conn->tpg->tpg_attrib.authentication) {
 904                 pr_err("Initiator is requesting CSG: 1, has not been"
 905                          " successfully authenticated, and the Target is"
 906                         " enforcing iSCSI Authentication, login failed.\n");
 907                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 908                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 909                 return -1;
 910         }
 911
 912         if (!iscsi_check_negotiated_keys(conn->param_list))
 913                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 914                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 915                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 916                                             ISCSI_FLAG_LOGIN_TRANSIT;
 917
 918         return 0;
 919 }
 920
 921 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 922 {
 923         int pdu_count = 0;
 924         struct iscsi_login_req *login_req;
 925         struct iscsi_login_rsp *login_rsp;
 926
 927         login_req = (struct iscsi_login_req *) login->req;
 928         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 929
 930         while (1) {
 931                 if (++pdu_count > MAX_LOGIN_PDUS) {
 932                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 933                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 934                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 935                         return -1;
 936                 }
 937
 938                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 939                 case 0:
 940                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 941                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 942                                 return -1;
 943                         break;
 944                 case 1:
 945                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 946                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 947                                 return -1;
 948                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 949                                 login->tsih = conn->sess->tsih;
 950                                 login->login_complete = 1;
 951                                 iscsi_target_restore_sock_callbacks(conn);
 952                                 if (iscsi_target_do_tx_login_io(conn,
 953                                                 login) < 0)
 954                                         return -1;
 955                                 return 1;
 956                         }
 957                         break;
 958                 default:
 959                         pr_err("Illegal CSG: %d received from"
 960                                 " Initiator, protocol error.\n",
 961                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
 962                         break;
 963                 }
 964
 965                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
 966                         return -1;
 967
 968                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 969                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
 970                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
 971                 }
 972                 break;
 973         }
 974
 975         if (conn->sock) {
 976                 struct sock *sk = conn->sock->sk;
 977                 bool state;
 978
 979                 read_lock_bh(&sk->sk_callback_lock);
 980                 state = iscsi_target_sk_state_check(sk);
 981                 read_unlock_bh(&sk->sk_callback_lock);
 982
 983                 if (!state) {
 984                         pr_debug("iscsi_target_do_login() failed state for"
 985                                  " conn: %p\n", conn);
 986                         return -1;
 987                 }
 988         }
 989
 990         return 0;
 991 }
 992
 993 static void iscsi_initiatorname_tolower(
 994         char *param_buf)
 995 {
 996         char *c;
 997         u32 iqn_size = strlen(param_buf), i;
 998
 999         for (i = 0; i < iqn_size; i++) {
1000                 c = &param_buf[i];
1001                 if (!isupper(*c))
1002                         continue;
1003
1004                 *c = tolower(*c);
1005         }
1006 }
1007
1008 /*
1009  * Processes the first Login Request..
1010  */
1011 int iscsi_target_locate_portal(
1012         struct iscsi_np *np,
1013         struct iscsi_conn *conn,
1014         struct iscsi_login *login)
1015 {
1016         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1017         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1018         struct iscsi_session *sess = conn->sess;
1019         struct iscsi_tiqn *tiqn;
1020         struct iscsi_tpg_np *tpg_np = NULL;
1021         struct iscsi_login_req *login_req;
1022         struct se_node_acl *se_nacl;
1023         u32 payload_length, queue_depth = 0;
1024         int sessiontype = 0, ret = 0, tag_num, tag_size;
1025
1026         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1027         INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1028         iscsi_target_set_sock_callbacks(conn);
1029
1030         login->np = np;
1031
1032         login_req = (struct iscsi_login_req *) login->req;
1033         payload_length = ntoh24(login_req->dlength);
1034
1035         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1036         if (!tmpbuf) {
1037                 pr_err("Unable to allocate memory for tmpbuf.\n");
1038                 return -1;
1039         }
1040
1041         memcpy(tmpbuf, login->req_buf, payload_length);
1042         tmpbuf[payload_length] = '\0';
1043         start = tmpbuf;
1044         end = (start + payload_length);
1045
1046         /*
1047          * Locate the initial keys expected from the Initiator node in
1048          * the first login request in order to progress with the login phase.
1049          */
1050         while (start < end) {
1051                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1052                         ret = -1;
1053                         goto out;
1054                 }
1055
1056                 if (!strncmp(key, "InitiatorName", 13))
1057                         i_buf = value;
1058                 else if (!strncmp(key, "SessionType", 11))
1059                         s_buf = value;
1060                 else if (!strncmp(key, "TargetName", 10))
1061                         t_buf = value;
1062
1063                 start += strlen(key) + strlen(value) + 2;
1064         }
1065         /*
1066          * See 5.3.  Login Phase.
1067          */
1068         if (!i_buf) {
1069                 pr_err("InitiatorName key not received"
1070                         " in first login request.\n");
1071                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1072                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1073                 ret = -1;
1074                 goto out;
1075         }
1076         /*
1077          * Convert the incoming InitiatorName to lowercase following
1078          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1079          * are NOT case sensitive.
1080          */
1081         iscsi_initiatorname_tolower(i_buf);
1082
1083         if (!s_buf) {
1084                 if (!login->leading_connection)
1085                         goto get_target;
1086
1087                 pr_err("SessionType key not received"
1088                         " in first login request.\n");
1089                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1090                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1091                 ret = -1;
1092                 goto out;
1093         }
1094
1095         /*
1096          * Use default portal group for discovery sessions.
1097          */
1098         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1099         if (!sessiontype) {
1100                 conn->tpg = iscsit_global->discovery_tpg;
1101                 if (!login->leading_connection)
1102                         goto get_target;
1103
1104                 sess->sess_ops->SessionType = 1;
1105                 /*
1106                  * Setup crc32c modules from libcrypto
1107                  */
1108                 if (iscsi_login_setup_crypto(conn) < 0) {
1109                         pr_err("iscsi_login_setup_crypto() failed\n");
1110                         ret = -1;
1111                         goto out;
1112                 }
1113                 /*
1114                  * Serialize access across the discovery struct iscsi_portal_group to
1115                  * process login attempt.
1116                  */
1117                 if (iscsit_access_np(np, conn->tpg) < 0) {
1118                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1119                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1120                         ret = -1;
1121                         goto out;
1122                 }
1123                 ret = 0;
1124                 goto alloc_tags;
1125         }
1126
1127 get_target:
1128         if (!t_buf) {
1129                 pr_err("TargetName key not received"
1130                         " in first login request while"
1131                         " SessionType=Normal.\n");
1132                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1133                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1134                 ret = -1;
1135                 goto out;
1136         }
1137
1138         /*
1139          * Locate Target IQN from Storage Node.
1140          */
1141         tiqn = iscsit_get_tiqn_for_login(t_buf);
1142         if (!tiqn) {
1143                 pr_err("Unable to locate Target IQN: %s in"
1144                         " Storage Node\n", t_buf);
1145                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1146                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1147                 ret = -1;
1148                 goto out;
1149         }
1150         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1151
1152         /*
1153          * Locate Target Portal Group from Storage Node.
1154          */
1155         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1156         if (!conn->tpg) {
1157                 pr_err("Unable to locate Target Portal Group"
1158                                 " on %s\n", tiqn->tiqn);
1159                 iscsit_put_tiqn_for_login(tiqn);
1160                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1161                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1162                 ret = -1;
1163                 goto out;
1164         }
1165         conn->tpg_np = tpg_np;
1166         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1167         /*
1168          * Setup crc32c modules from libcrypto
1169          */
1170         if (iscsi_login_setup_crypto(conn) < 0) {
1171                 pr_err("iscsi_login_setup_crypto() failed\n");
1172                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1173                 iscsit_put_tiqn_for_login(tiqn);
1174                 conn->tpg = NULL;
1175                 ret = -1;
1176                 goto out;
1177         }
1178         /*
1179          * Serialize access across the struct iscsi_portal_group to
1180          * process login attempt.
1181          */
1182         if (iscsit_access_np(np, conn->tpg) < 0) {
1183                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1184                 iscsit_put_tiqn_for_login(tiqn);
1185                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1186                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1187                 conn->tpg = NULL;
1188                 ret = -1;
1189                 goto out;
1190         }
1191
1192         /*
1193          * conn->sess->node_acl will be set when the referenced
1194          * struct iscsi_session is located from received ISID+TSIH in
1195          * iscsi_login_non_zero_tsih_s2().
1196          */
1197         if (!login->leading_connection) {
1198                 ret = 0;
1199                 goto out;
1200         }
1201
1202         /*
1203          * This value is required in iscsi_login_zero_tsih_s2()
1204          */
1205         sess->sess_ops->SessionType = 0;
1206
1207         /*
1208          * Locate incoming Initiator IQN reference from Storage Node.
1209          */
1210         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1211                         &conn->tpg->tpg_se_tpg, i_buf);
1212         if (!sess->se_sess->se_node_acl) {
1213                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1214                         " access iSCSI target portal group: %hu.\n",
1215                                 i_buf, conn->tpg->tpgt);
1216                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1217                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1218                 ret = -1;
1219                 goto out;
1220         }
1221         se_nacl = sess->se_sess->se_node_acl;
1222         queue_depth = se_nacl->queue_depth;
1223         /*
1224          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1225          * depth for non immediate commands, plus extra tags for immediate
1226          * commands.
1227          *
1228          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1229          * in per-cpu-ida tag allocation logic + small queue_depth.
1230          */
1231 alloc_tags:
1232         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1233         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1234         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1235
1236         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1237         if (ret < 0) {
1238                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1239                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1240                 ret = -1;
1241         }
1242 out:
1243         kfree(tmpbuf);
1244         return ret;
1245 }
1246
1247 int iscsi_target_start_negotiation(
1248         struct iscsi_login *login,
1249         struct iscsi_conn *conn)
1250 {
1251         int ret;
1252
1253         if (conn->sock) {
1254                 struct sock *sk = conn->sock->sk;
1255
1256                 write_lock_bh(&sk->sk_callback_lock);
1257                 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1258                 write_unlock_bh(&sk->sk_callback_lock);
1259         }
1260
1261         ret = iscsi_target_do_login(conn, login);
1262         if (ret < 0) {
1263                 cancel_delayed_work_sync(&conn->login_work);
1264                 cancel_delayed_work_sync(&conn->login_cleanup_work);
1265                 iscsi_target_restore_sock_callbacks(conn);
1266                 iscsi_remove_failed_auth_entry(conn);
1267         }
1268         if (ret != 0)
1269                 iscsi_target_nego_release(conn);
1270
1271         return ret;
1272 }
1273
1274 void iscsi_target_nego_release(struct iscsi_conn *conn)
1275 {
1276         struct iscsi_login *login = conn->conn_login;
1277
1278         if (!login)
1279                 return;
1280
1281         kfree(login->req_buf);
1282         kfree(login->rsp_buf);
1283         kfree(login);
1284
1285         conn->conn_login = NULL;
1286 }