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