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