drivers/target/iscsi/iscsi_target_nego.c

   1 /*******************************************************************************
   2  * This file contains main functions related to iSCSI Parameter negotiation.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/ctype.h>
  20 #include <linux/kthread.h>
  21 #include <linux/slab.h>
  22 #include <linux/sched/signal.h>
  23 #include <net/sock.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <target/target_core_base.h>
  26 #include <target/target_core_fabric.h>
  27 #include <target/iscsi/iscsi_transport.h>
  28
  29 #include <target/iscsi/iscsi_target_core.h>
  30 #include "iscsi_target_parameters.h"
  31 #include "iscsi_target_login.h"
  32 #include "iscsi_target_nego.h"
  33 #include "iscsi_target_tpg.h"
  34 #include "iscsi_target_util.h"
  35 #include "iscsi_target.h"
  36 #include "iscsi_target_auth.h"
  37
  38 #define MAX_LOGIN_PDUS  7
  39 #define TEXT_LEN        4096
  40
  41 void convert_null_to_semi(char *buf, int len)
  42 {
  43         int i;
  44
  45         for (i = 0; i < len; i++)
  46                 if (buf[i] == '\0')
  47                         buf[i] = ';';
  48 }
  49
  50 static int strlen_semi(char *buf)
  51 {
  52         int i = 0;
  53
  54         while (buf[i] != '\0') {
  55                 if (buf[i] == ';')
  56                         return i;
  57                 i++;
  58         }
  59
  60         return -1;
  61 }
  62
  63 int extract_param(
  64         const char *in_buf,
  65         const char *pattern,
  66         unsigned int max_length,
  67         char *out_buf,
  68         unsigned char *type)
  69 {
  70         char *ptr;
  71         int len;
  72
  73         if (!in_buf || !pattern || !out_buf || !type)
  74                 return -1;
  75
  76         ptr = strstr(in_buf, pattern);
  77         if (!ptr)
  78                 return -1;
  79
  80         ptr = strstr(ptr, "=");
  81         if (!ptr)
  82                 return -1;
  83
  84         ptr += 1;
  85         if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
  86                 ptr += 2; /* skip 0x */
  87                 *type = HEX;
  88         } else
  89                 *type = DECIMAL;
  90
  91         len = strlen_semi(ptr);
  92         if (len < 0)
  93                 return -1;
  94
  95         if (len >= max_length) {
  96                 pr_err("Length of input: %d exceeds max_length:"
  97                         " %d\n", len, max_length);
  98                 return -1;
  99         }
 100         memcpy(out_buf, ptr, len);
 101         out_buf[len] = '\0';
 102
 103         return 0;
 104 }
 105
 106 static u32 iscsi_handle_authentication(
 107         struct iscsi_conn *conn,
 108         char *in_buf,
 109         char *out_buf,
 110         int in_length,
 111         int *out_length,
 112         unsigned char *authtype)
 113 {
 114         struct iscsi_session *sess = conn->sess;
 115         struct iscsi_node_auth *auth;
 116         struct iscsi_node_acl *iscsi_nacl;
 117         struct iscsi_portal_group *iscsi_tpg;
 118         struct se_node_acl *se_nacl;
 119
 120         if (!sess->sess_ops->SessionType) {
 121                 /*
 122                  * For SessionType=Normal
 123                  */
 124                 se_nacl = conn->sess->se_sess->se_node_acl;
 125                 if (!se_nacl) {
 126                         pr_err("Unable to locate struct se_node_acl for"
 127                                         " CHAP auth\n");
 128                         return -1;
 129                 }
 130                 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 131                                 se_node_acl);
 132                 if (!iscsi_nacl) {
 133                         pr_err("Unable to locate struct iscsi_node_acl for"
 134                                         " CHAP auth\n");
 135                         return -1;
 136                 }
 137
 138                 if (se_nacl->dynamic_node_acl) {
 139                         iscsi_tpg = container_of(se_nacl->se_tpg,
 140                                         struct iscsi_portal_group, tpg_se_tpg);
 141
 142                         auth = &iscsi_tpg->tpg_demo_auth;
 143                 } else {
 144                         iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 145                                                   se_node_acl);
 146
 147                         auth = &iscsi_nacl->node_auth;
 148                 }
 149         } else {
 150                 /*
 151                  * For SessionType=Discovery
 152                  */
 153                 auth = &iscsit_global->discovery_acl.node_auth;
 154         }
 155
 156         if (strstr("CHAP", authtype))
 157                 strcpy(conn->sess->auth_type, "CHAP");
 158         else
 159                 strcpy(conn->sess->auth_type, NONE);
 160
 161         if (strstr("None", authtype))
 162                 return 1;
 163 #ifdef CANSRP
 164         else if (strstr("SRP", authtype))
 165                 return srp_main_loop(conn, auth, in_buf, out_buf,
 166                                 &in_length, out_length);
 167 #endif
 168         else if (strstr("CHAP", authtype))
 169                 return chap_main_loop(conn, auth, in_buf, out_buf,
 170                                 &in_length, out_length);
 171         else if (strstr("SPKM1", authtype))
 172                 return 2;
 173         else if (strstr("SPKM2", authtype))
 174                 return 2;
 175         else if (strstr("KRB5", authtype))
 176                 return 2;
 177         else
 178                 return 2;
 179 }
 180
 181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
 182 {
 183         kfree(conn->auth_protocol);
 184 }
 185
 186 int iscsi_target_check_login_request(
 187         struct iscsi_conn *conn,
 188         struct iscsi_login *login)
 189 {
 190         int req_csg, req_nsg;
 191         u32 payload_length;
 192         struct iscsi_login_req *login_req;
 193
 194         login_req = (struct iscsi_login_req *) login->req;
 195         payload_length = ntoh24(login_req->dlength);
 196
 197         switch (login_req->opcode & ISCSI_OPCODE_MASK) {
 198         case ISCSI_OP_LOGIN:
 199                 break;
 200         default:
 201                 pr_err("Received unknown opcode 0x%02x.\n",
 202                                 login_req->opcode & ISCSI_OPCODE_MASK);
 203                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 204                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 205                 return -1;
 206         }
 207
 208         if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
 209             (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 210                 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
 211                         " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
 212                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 213                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 214                 return -1;
 215         }
 216
 217         req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
 218         req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 219
 220         if (req_csg != login->current_stage) {
 221                 pr_err("Initiator unexpectedly changed login stage"
 222                         " from %d to %d, login failed.\n", login->current_stage,
 223                         req_csg);
 224                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 225                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 226                 return -1;
 227         }
 228
 229         if ((req_nsg == 2) || (req_csg >= 2) ||
 230            ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
 231             (req_nsg <= req_csg))) {
 232                 pr_err("Illegal login_req->flags Combination, CSG: %d,"
 233                         " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
 234                         req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
 235                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 236                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 237                 return -1;
 238         }
 239
 240         if ((login_req->max_version != login->version_max) ||
 241             (login_req->min_version != login->version_min)) {
 242                 pr_err("Login request changed Version Max/Nin"
 243                         " unexpectedly to 0x%02x/0x%02x, protocol error\n",
 244                         login_req->max_version, login_req->min_version);
 245                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 246                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 247                 return -1;
 248         }
 249
 250         if (memcmp(login_req->isid, login->isid, 6) != 0) {
 251                 pr_err("Login request changed ISID unexpectedly,"
 252                                 " protocol error.\n");
 253                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 254                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 255                 return -1;
 256         }
 257
 258         if (login_req->itt != login->init_task_tag) {
 259                 pr_err("Login request changed ITT unexpectedly to"
 260                         " 0x%08x, protocol error.\n", login_req->itt);
 261                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 262                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 263                 return -1;
 264         }
 265
 266         if (payload_length > MAX_KEY_VALUE_PAIRS) {
 267                 pr_err("Login request payload exceeds default"
 268                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 269                                 MAX_KEY_VALUE_PAIRS);
 270                 return -1;
 271         }
 272
 273         return 0;
 274 }
 275 EXPORT_SYMBOL(iscsi_target_check_login_request);
 276
 277 static int iscsi_target_check_first_request(
 278         struct iscsi_conn *conn,
 279         struct iscsi_login *login)
 280 {
 281         struct iscsi_param *param = NULL;
 282         struct se_node_acl *se_nacl;
 283
 284         login->first_request = 0;
 285
 286         list_for_each_entry(param, &conn->param_list->param_list, p_list) {
 287                 if (!strncmp(param->name, SESSIONTYPE, 11)) {
 288                         if (!IS_PSTATE_ACCEPTOR(param)) {
 289                                 pr_err("SessionType key not received"
 290                                         " in first login request.\n");
 291                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 292                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 293                                 return -1;
 294                         }
 295                         if (!strncmp(param->value, DISCOVERY, 9))
 296                                 return 0;
 297                 }
 298
 299                 if (!strncmp(param->name, INITIATORNAME, 13)) {
 300                         if (!IS_PSTATE_ACCEPTOR(param)) {
 301                                 if (!login->leading_connection)
 302                                         continue;
 303
 304                                 pr_err("InitiatorName key not received"
 305                                         " in first login request.\n");
 306                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 307                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 308                                 return -1;
 309                         }
 310
 311                         /*
 312                          * For non-leading connections, double check that the
 313                          * received InitiatorName matches the existing session's
 314                          * struct iscsi_node_acl.
 315                          */
 316                         if (!login->leading_connection) {
 317                                 se_nacl = conn->sess->se_sess->se_node_acl;
 318                                 if (!se_nacl) {
 319                                         pr_err("Unable to locate"
 320                                                 " struct se_node_acl\n");
 321                                         iscsit_tx_login_rsp(conn,
 322                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 323                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 324                                         return -1;
 325                                 }
 326
 327                                 if (strcmp(param->value,
 328                                                 se_nacl->initiatorname)) {
 329                                         pr_err("Incorrect"
 330                                                 " InitiatorName: %s for this"
 331                                                 " iSCSI Initiator Node.\n",
 332                                                 param->value);
 333                                         iscsit_tx_login_rsp(conn,
 334                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 335                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 336                                         return -1;
 337                                 }
 338                         }
 339                 }
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 346 {
 347         u32 padding = 0;
 348         struct iscsi_login_rsp *login_rsp;
 349
 350         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 351
 352         login_rsp->opcode               = ISCSI_OP_LOGIN_RSP;
 353         hton24(login_rsp->dlength, login->rsp_length);
 354         memcpy(login_rsp->isid, login->isid, 6);
 355         login_rsp->tsih                 = cpu_to_be16(login->tsih);
 356         login_rsp->itt                  = login->init_task_tag;
 357         login_rsp->statsn               = cpu_to_be32(conn->stat_sn++);
 358         login_rsp->exp_cmdsn            = cpu_to_be32(conn->sess->exp_cmd_sn);
 359         login_rsp->max_cmdsn            = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
 360
 361         pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
 362                 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
 363                 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
 364                 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
 365                 ntohl(login_rsp->statsn), login->rsp_length);
 366
 367         padding = ((-login->rsp_length) & 3);
 368         /*
 369          * Before sending the last login response containing the transition
 370          * bit for full-feature-phase, go ahead and start up TX/RX threads
 371          * now to avoid potential resource allocation failures after the
 372          * final login response has been sent.
 373          */
 374         if (login->login_complete) {
 375                 int rc = iscsit_start_kthreads(conn);
 376                 if (rc) {
 377                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 378                                             ISCSI_LOGIN_STATUS_NO_RESOURCES);
 379                         return -1;
 380                 }
 381         }
 382
 383         if (conn->conn_transport->iscsit_put_login_tx(conn, login,
 384                                         login->rsp_length + padding) < 0)
 385                 goto err;
 386
 387         login->rsp_length               = 0;
 388
 389         return 0;
 390
 391 err:
 392         if (login->login_complete) {
 393                 if (conn->rx_thread && conn->rx_thread_active) {
 394                         send_sig(SIGINT, conn->rx_thread, 1);
 395                         complete(&conn->rx_login_comp);
 396                         kthread_stop(conn->rx_thread);
 397                 }
 398                 if (conn->tx_thread && conn->tx_thread_active) {
 399                         send_sig(SIGINT, conn->tx_thread, 1);
 400                         kthread_stop(conn->tx_thread);
 401                 }
 402                 spin_lock(&iscsit_global->ts_bitmap_lock);
 403                 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 404                                       get_order(1));
 405                 spin_unlock(&iscsit_global->ts_bitmap_lock);
 406         }
 407         return -1;
 408 }
 409
 410 static void iscsi_target_sk_data_ready(struct sock *sk)
 411 {
 412         struct iscsi_conn *conn = sk->sk_user_data;
 413         bool rc;
 414
 415         pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 416
 417         write_lock_bh(&sk->sk_callback_lock);
 418         if (!sk->sk_user_data) {
 419                 write_unlock_bh(&sk->sk_callback_lock);
 420                 return;
 421         }
 422         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 423                 write_unlock_bh(&sk->sk_callback_lock);
 424                 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
 425                 return;
 426         }
 427         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 428                 write_unlock_bh(&sk->sk_callback_lock);
 429                 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
 430                 return;
 431         }
 432         if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 433                 write_unlock_bh(&sk->sk_callback_lock);
 434                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
 435                 if (iscsi_target_sk_data_ready == conn->orig_data_ready)
 436                         return;
 437                 conn->orig_data_ready(sk);
 438                 return;
 439         }
 440
 441         rc = schedule_delayed_work(&conn->login_work, 0);
 442         if (!rc) {
 443                 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
 444                          " got false\n");
 445         }
 446         write_unlock_bh(&sk->sk_callback_lock);
 447 }
 448
 449 static void iscsi_target_sk_state_change(struct sock *);
 450
 451 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
 452 {
 453         struct sock *sk;
 454
 455         if (!conn->sock)
 456                 return;
 457
 458         sk = conn->sock->sk;
 459         pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
 460
 461         write_lock_bh(&sk->sk_callback_lock);
 462         sk->sk_user_data = conn;
 463         conn->orig_data_ready = sk->sk_data_ready;
 464         conn->orig_state_change = sk->sk_state_change;
 465         sk->sk_data_ready = iscsi_target_sk_data_ready;
 466         sk->sk_state_change = iscsi_target_sk_state_change;
 467         write_unlock_bh(&sk->sk_callback_lock);
 468
 469         sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
 470         sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
 471 }
 472
 473 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
 474 {
 475         struct sock *sk;
 476
 477         if (!conn->sock)
 478                 return;
 479
 480         sk = conn->sock->sk;
 481         pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
 482
 483         write_lock_bh(&sk->sk_callback_lock);
 484         if (!sk->sk_user_data) {
 485                 write_unlock_bh(&sk->sk_callback_lock);
 486                 return;
 487         }
 488         sk->sk_user_data = NULL;
 489         sk->sk_data_ready = conn->orig_data_ready;
 490         sk->sk_state_change = conn->orig_state_change;
 491         write_unlock_bh(&sk->sk_callback_lock);
 492
 493         sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
 494         sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
 495 }
 496
 497 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
 498
 499 static bool __iscsi_target_sk_check_close(struct sock *sk)
 500 {
 501         if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
 502                 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
 503                         "returning FALSE\n");
 504                 return true;
 505         }
 506         return false;
 507 }
 508
 509 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
 510 {
 511         bool state = false;
 512
 513         if (conn->sock) {
 514                 struct sock *sk = conn->sock->sk;
 515
 516                 read_lock_bh(&sk->sk_callback_lock);
 517                 state = (__iscsi_target_sk_check_close(sk) ||
 518                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 519                 read_unlock_bh(&sk->sk_callback_lock);
 520         }
 521         return state;
 522 }
 523
 524 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
 525 {
 526         bool state = false;
 527
 528         if (conn->sock) {
 529                 struct sock *sk = conn->sock->sk;
 530
 531                 read_lock_bh(&sk->sk_callback_lock);
 532                 state = test_bit(flag, &conn->login_flags);
 533                 read_unlock_bh(&sk->sk_callback_lock);
 534         }
 535         return state;
 536 }
 537
 538 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
 539 {
 540         bool state = false;
 541
 542         if (conn->sock) {
 543                 struct sock *sk = conn->sock->sk;
 544
 545                 write_lock_bh(&sk->sk_callback_lock);
 546                 state = (__iscsi_target_sk_check_close(sk) ||
 547                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 548                 if (!state)
 549                         clear_bit(flag, &conn->login_flags);
 550                 write_unlock_bh(&sk->sk_callback_lock);
 551         }
 552         return state;
 553 }
 554
 555 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
 556 {
 557         bool zero_tsih = login->zero_tsih;
 558
 559         iscsi_remove_failed_auth_entry(conn);
 560         iscsi_target_nego_release(conn);
 561         iscsi_target_login_sess_out(conn, zero_tsih, true);
 562 }
 563
 564 static void iscsi_target_login_timeout(unsigned long data)
 565 {
 566         struct iscsi_conn *conn = (struct iscsi_conn *)data;
 567
 568         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 569
 570         if (conn->login_kworker) {
 571                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 572                          conn->login_kworker->comm, conn->login_kworker->pid);
 573                 send_sig(SIGINT, conn->login_kworker, 1);
 574         }
 575 }
 576
 577 static void iscsi_target_do_login_rx(struct work_struct *work)
 578 {
 579         struct iscsi_conn *conn = container_of(work,
 580                                 struct iscsi_conn, login_work.work);
 581         struct iscsi_login *login = conn->login;
 582         struct iscsi_np *np = login->np;
 583         struct iscsi_portal_group *tpg = conn->tpg;
 584         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 585         struct timer_list login_timer;
 586         int rc, zero_tsih = login->zero_tsih;
 587         bool state;
 588
 589         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 590                         conn, current->comm, current->pid);
 591         /*
 592          * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
 593          * before initial PDU processing in iscsi_target_start_negotiation()
 594          * has completed, go ahead and retry until it's cleared.
 595          *
 596          * Otherwise if the TCP connection drops while this is occuring,
 597          * iscsi_target_start_negotiation() will detect the failure, call
 598          * cancel_delayed_work_sync(&conn->login_work), and cleanup the
 599          * remaining iscsi connection resources from iscsi_np process context.
 600          */
 601         if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
 602                 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
 603                 return;
 604         }
 605
 606         spin_lock(&tpg->tpg_state_lock);
 607         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 608         spin_unlock(&tpg->tpg_state_lock);
 609
 610         if (!state) {
 611                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 612                 goto err;
 613         }
 614
 615         if (iscsi_target_sk_check_close(conn)) {
 616                 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 617                 goto err;
 618         }
 619
 620         conn->login_kworker = current;
 621         allow_signal(SIGINT);
 622
 623         init_timer(&login_timer);
 624         login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 625         login_timer.data = (unsigned long)conn;
 626         login_timer.function = iscsi_target_login_timeout;
 627         add_timer(&login_timer);
 628         pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
 629
 630         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 631         del_timer_sync(&login_timer);
 632         flush_signals(current);
 633         conn->login_kworker = NULL;
 634
 635         if (rc < 0)
 636                 goto err;
 637
 638         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 639                         conn, current->comm, current->pid);
 640
 641         rc = iscsi_target_do_login(conn, login);
 642         if (rc < 0) {
 643                 goto err;
 644         } else if (!rc) {
 645                 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
 646                         goto err;
 647         } else if (rc == 1) {
 648                 iscsi_target_nego_release(conn);
 649                 iscsi_post_login_handler(np, conn, zero_tsih);
 650                 iscsit_deaccess_np(np, tpg, tpg_np);
 651         }
 652         return;
 653
 654 err:
 655         iscsi_target_restore_sock_callbacks(conn);
 656         iscsi_target_login_drop(conn, login);
 657         iscsit_deaccess_np(np, tpg, tpg_np);
 658 }
 659
 660 static void iscsi_target_sk_state_change(struct sock *sk)
 661 {
 662         struct iscsi_conn *conn;
 663         void (*orig_state_change)(struct sock *);
 664         bool state;
 665
 666         pr_debug("Entering iscsi_target_sk_state_change\n");
 667
 668         write_lock_bh(&sk->sk_callback_lock);
 669         conn = sk->sk_user_data;
 670         if (!conn) {
 671                 write_unlock_bh(&sk->sk_callback_lock);
 672                 return;
 673         }
 674         orig_state_change = conn->orig_state_change;
 675
 676         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 677                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 678                          conn);
 679                 write_unlock_bh(&sk->sk_callback_lock);
 680                 orig_state_change(sk);
 681                 return;
 682         }
 683         state = __iscsi_target_sk_check_close(sk);
 684         pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
 685
 686         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 687                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 688                          " conn: %p\n", conn);
 689                 if (state)
 690                         set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 691                 write_unlock_bh(&sk->sk_callback_lock);
 692                 orig_state_change(sk);
 693                 return;
 694         }
 695         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 696                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 697                          conn);
 698                 write_unlock_bh(&sk->sk_callback_lock);
 699                 orig_state_change(sk);
 700                 return;
 701         }
 702         /*
 703          * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
 704          * but only queue conn->login_work -> iscsi_target_do_login_rx()
 705          * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
 706          *
 707          * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
 708          * will detect the dropped TCP connection from delayed workqueue context.
 709          *
 710          * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
 711          * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
 712          * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
 713          * via iscsi_target_sk_check_and_clear() is responsible for detecting the
 714          * dropped TCP connection in iscsi_np process context, and cleaning up
 715          * the remaining iscsi connection resources.
 716          */
 717         if (state) {
 718                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 719                 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 720                 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
 721                 write_unlock_bh(&sk->sk_callback_lock);
 722
 723                 orig_state_change(sk);
 724
 725                 if (!state)
 726                         schedule_delayed_work(&conn->login_work, 0);
 727                 return;
 728         }
 729         write_unlock_bh(&sk->sk_callback_lock);
 730
 731         orig_state_change(sk);
 732 }
 733
 734 /*
 735  *      NOTE: We check for existing sessions or connections AFTER the initiator
 736  *      has been successfully authenticated in order to protect against faked
 737  *      ISID/TSIH combinations.
 738  */
 739 static int iscsi_target_check_for_existing_instances(
 740         struct iscsi_conn *conn,
 741         struct iscsi_login *login)
 742 {
 743         if (login->checked_for_existing)
 744                 return 0;
 745
 746         login->checked_for_existing = 1;
 747
 748         if (!login->tsih)
 749                 return iscsi_check_for_session_reinstatement(conn);
 750         else
 751                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 752                                 login->initial_exp_statsn);
 753 }
 754
 755 static int iscsi_target_do_authentication(
 756         struct iscsi_conn *conn,
 757         struct iscsi_login *login)
 758 {
 759         int authret;
 760         u32 payload_length;
 761         struct iscsi_param *param;
 762         struct iscsi_login_req *login_req;
 763         struct iscsi_login_rsp *login_rsp;
 764
 765         login_req = (struct iscsi_login_req *) login->req;
 766         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 767         payload_length = ntoh24(login_req->dlength);
 768
 769         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 770         if (!param)
 771                 return -1;
 772
 773         authret = iscsi_handle_authentication(
 774                         conn,
 775                         login->req_buf,
 776                         login->rsp_buf,
 777                         payload_length,
 778                         &login->rsp_length,
 779                         param->value);
 780         switch (authret) {
 781         case 0:
 782                 pr_debug("Received OK response"
 783                 " from LIO Authentication, continuing.\n");
 784                 break;
 785         case 1:
 786                 pr_debug("iSCSI security negotiation"
 787                         " completed successfully.\n");
 788                 login->auth_complete = 1;
 789                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 790                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 791                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 792                                              ISCSI_FLAG_LOGIN_TRANSIT);
 793                         login->current_stage = 1;
 794                 }
 795                 return iscsi_target_check_for_existing_instances(
 796                                 conn, login);
 797         case 2:
 798                 pr_err("Security negotiation"
 799                         " failed.\n");
 800                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 801                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 802                 return -1;
 803         default:
 804                 pr_err("Received unknown error %d from LIO"
 805                                 " Authentication\n", authret);
 806                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 807                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 808                 return -1;
 809         }
 810
 811         return 0;
 812 }
 813
 814 static int iscsi_target_handle_csg_zero(
 815         struct iscsi_conn *conn,
 816         struct iscsi_login *login)
 817 {
 818         int ret;
 819         u32 payload_length;
 820         struct iscsi_param *param;
 821         struct iscsi_login_req *login_req;
 822         struct iscsi_login_rsp *login_rsp;
 823
 824         login_req = (struct iscsi_login_req *) login->req;
 825         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 826         payload_length = ntoh24(login_req->dlength);
 827
 828         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 829         if (!param)
 830                 return -1;
 831
 832         ret = iscsi_decode_text_input(
 833                         PHASE_SECURITY|PHASE_DECLARATIVE,
 834                         SENDER_INITIATOR|SENDER_RECEIVER,
 835                         login->req_buf,
 836                         payload_length,
 837                         conn);
 838         if (ret < 0)
 839                 return -1;
 840
 841         if (ret > 0) {
 842                 if (login->auth_complete) {
 843                         pr_err("Initiator has already been"
 844                                 " successfully authenticated, but is still"
 845                                 " sending %s keys.\n", param->value);
 846                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 847                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 848                         return -1;
 849                 }
 850
 851                 goto do_auth;
 852         } else if (!payload_length) {
 853                 pr_err("Initiator sent zero length security payload,"
 854                        " login failed\n");
 855                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 856                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 857                 return -1;
 858         }
 859
 860         if (login->first_request)
 861                 if (iscsi_target_check_first_request(conn, login) < 0)
 862                         return -1;
 863
 864         ret = iscsi_encode_text_output(
 865                         PHASE_SECURITY|PHASE_DECLARATIVE,
 866                         SENDER_TARGET,
 867                         login->rsp_buf,
 868                         &login->rsp_length,
 869                         conn->param_list,
 870                         conn->tpg->tpg_attrib.login_keys_workaround);
 871         if (ret < 0)
 872                 return -1;
 873
 874         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 875                 if (conn->tpg->tpg_attrib.authentication &&
 876                     !strncmp(param->value, NONE, 4)) {
 877                         pr_err("Initiator sent AuthMethod=None but"
 878                                 " Target is enforcing iSCSI Authentication,"
 879                                         " login failed.\n");
 880                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 881                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 882                         return -1;
 883                 }
 884
 885                 if (conn->tpg->tpg_attrib.authentication &&
 886                     !login->auth_complete)
 887                         return 0;
 888
 889                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 890                         return 0;
 891
 892                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 893                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 894                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 895                                             ISCSI_FLAG_LOGIN_TRANSIT;
 896                         login->current_stage = 1;
 897                 }
 898         }
 899
 900         return 0;
 901 do_auth:
 902         return iscsi_target_do_authentication(conn, login);
 903 }
 904
 905 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 906 {
 907         int ret;
 908         u32 payload_length;
 909         struct iscsi_login_req *login_req;
 910         struct iscsi_login_rsp *login_rsp;
 911
 912         login_req = (struct iscsi_login_req *) login->req;
 913         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 914         payload_length = ntoh24(login_req->dlength);
 915
 916         ret = iscsi_decode_text_input(
 917                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 918                         SENDER_INITIATOR|SENDER_RECEIVER,
 919                         login->req_buf,
 920                         payload_length,
 921                         conn);
 922         if (ret < 0) {
 923                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 924                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 925                 return -1;
 926         }
 927
 928         if (login->first_request)
 929                 if (iscsi_target_check_first_request(conn, login) < 0)
 930                         return -1;
 931
 932         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 933                 return -1;
 934
 935         ret = iscsi_encode_text_output(
 936                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 937                         SENDER_TARGET,
 938                         login->rsp_buf,
 939                         &login->rsp_length,
 940                         conn->param_list,
 941                         conn->tpg->tpg_attrib.login_keys_workaround);
 942         if (ret < 0) {
 943                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 944                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 945                 return -1;
 946         }
 947
 948         if (!login->auth_complete &&
 949              conn->tpg->tpg_attrib.authentication) {
 950                 pr_err("Initiator is requesting CSG: 1, has not been"
 951                          " successfully authenticated, and the Target is"
 952                         " enforcing iSCSI Authentication, login failed.\n");
 953                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 954                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 955                 return -1;
 956         }
 957
 958         if (!iscsi_check_negotiated_keys(conn->param_list))
 959                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 960                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 961                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 962                                             ISCSI_FLAG_LOGIN_TRANSIT;
 963
 964         return 0;
 965 }
 966
 967 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 968 {
 969         int pdu_count = 0;
 970         struct iscsi_login_req *login_req;
 971         struct iscsi_login_rsp *login_rsp;
 972
 973         login_req = (struct iscsi_login_req *) login->req;
 974         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 975
 976         while (1) {
 977                 if (++pdu_count > MAX_LOGIN_PDUS) {
 978                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 979                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 980                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 981                         return -1;
 982                 }
 983
 984                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 985                 case 0:
 986                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 987                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 988                                 return -1;
 989                         break;
 990                 case 1:
 991                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 992                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 993                                 return -1;
 994                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 995                                 /*
 996                                  * Check to make sure the TCP connection has not
 997                                  * dropped asynchronously while session reinstatement
 998                                  * was occuring in this kthread context, before
 999                                  * transitioning to full feature phase operation.
1000                                  */
1001                                 if (iscsi_target_sk_check_close(conn))
1002                                         return -1;
1003
1004                                 login->tsih = conn->sess->tsih;
1005                                 login->login_complete = 1;
1006                                 iscsi_target_restore_sock_callbacks(conn);
1007                                 if (iscsi_target_do_tx_login_io(conn,
1008                                                 login) < 0)
1009                                         return -1;
1010                                 return 1;
1011                         }
1012                         break;
1013                 default:
1014                         pr_err("Illegal CSG: %d received from"
1015                                 " Initiator, protocol error.\n",
1016                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1017                         break;
1018                 }
1019
1020                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1021                         return -1;
1022
1023                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1024                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1025                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1026                 }
1027                 break;
1028         }
1029
1030         return 0;
1031 }
1032
1033 static void iscsi_initiatorname_tolower(
1034         char *param_buf)
1035 {
1036         char *c;
1037         u32 iqn_size = strlen(param_buf), i;
1038
1039         for (i = 0; i < iqn_size; i++) {
1040                 c = &param_buf[i];
1041                 if (!isupper(*c))
1042                         continue;
1043
1044                 *c = tolower(*c);
1045         }
1046 }
1047
1048 /*
1049  * Processes the first Login Request..
1050  */
1051 int iscsi_target_locate_portal(
1052         struct iscsi_np *np,
1053         struct iscsi_conn *conn,
1054         struct iscsi_login *login)
1055 {
1056         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1057         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1058         struct iscsi_session *sess = conn->sess;
1059         struct iscsi_tiqn *tiqn;
1060         struct iscsi_tpg_np *tpg_np = NULL;
1061         struct iscsi_login_req *login_req;
1062         struct se_node_acl *se_nacl;
1063         u32 payload_length, queue_depth = 0;
1064         int sessiontype = 0, ret = 0, tag_num, tag_size;
1065
1066         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1067         iscsi_target_set_sock_callbacks(conn);
1068
1069         login->np = np;
1070
1071         login_req = (struct iscsi_login_req *) login->req;
1072         payload_length = ntoh24(login_req->dlength);
1073
1074         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1075         if (!tmpbuf) {
1076                 pr_err("Unable to allocate memory for tmpbuf.\n");
1077                 return -1;
1078         }
1079
1080         memcpy(tmpbuf, login->req_buf, payload_length);
1081         tmpbuf[payload_length] = '\0';
1082         start = tmpbuf;
1083         end = (start + payload_length);
1084
1085         /*
1086          * Locate the initial keys expected from the Initiator node in
1087          * the first login request in order to progress with the login phase.
1088          */
1089         while (start < end) {
1090                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1091                         ret = -1;
1092                         goto out;
1093                 }
1094
1095                 if (!strncmp(key, "InitiatorName", 13))
1096                         i_buf = value;
1097                 else if (!strncmp(key, "SessionType", 11))
1098                         s_buf = value;
1099                 else if (!strncmp(key, "TargetName", 10))
1100                         t_buf = value;
1101
1102                 start += strlen(key) + strlen(value) + 2;
1103         }
1104         /*
1105          * See 5.3.  Login Phase.
1106          */
1107         if (!i_buf) {
1108                 pr_err("InitiatorName key not received"
1109                         " in first login request.\n");
1110                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1111                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1112                 ret = -1;
1113                 goto out;
1114         }
1115         /*
1116          * Convert the incoming InitiatorName to lowercase following
1117          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1118          * are NOT case sensitive.
1119          */
1120         iscsi_initiatorname_tolower(i_buf);
1121
1122         if (!s_buf) {
1123                 if (!login->leading_connection)
1124                         goto get_target;
1125
1126                 pr_err("SessionType key not received"
1127                         " in first login request.\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          * Use default portal group for discovery sessions.
1136          */
1137         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1138         if (!sessiontype) {
1139                 conn->tpg = iscsit_global->discovery_tpg;
1140                 if (!login->leading_connection)
1141                         goto get_target;
1142
1143                 sess->sess_ops->SessionType = 1;
1144                 /*
1145                  * Setup crc32c modules from libcrypto
1146                  */
1147                 if (iscsi_login_setup_crypto(conn) < 0) {
1148                         pr_err("iscsi_login_setup_crypto() failed\n");
1149                         ret = -1;
1150                         goto out;
1151                 }
1152                 /*
1153                  * Serialize access across the discovery struct iscsi_portal_group to
1154                  * process login attempt.
1155                  */
1156                 if (iscsit_access_np(np, conn->tpg) < 0) {
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                 ret = 0;
1163                 goto alloc_tags;
1164         }
1165
1166 get_target:
1167         if (!t_buf) {
1168                 pr_err("TargetName key not received"
1169                         " in first login request while"
1170                         " SessionType=Normal.\n");
1171                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1172                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1173                 ret = -1;
1174                 goto out;
1175         }
1176
1177         /*
1178          * Locate Target IQN from Storage Node.
1179          */
1180         tiqn = iscsit_get_tiqn_for_login(t_buf);
1181         if (!tiqn) {
1182                 pr_err("Unable to locate Target IQN: %s in"
1183                         " Storage Node\n", t_buf);
1184                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1185                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1186                 ret = -1;
1187                 goto out;
1188         }
1189         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1190
1191         /*
1192          * Locate Target Portal Group from Storage Node.
1193          */
1194         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1195         if (!conn->tpg) {
1196                 pr_err("Unable to locate Target Portal Group"
1197                                 " on %s\n", tiqn->tiqn);
1198                 iscsit_put_tiqn_for_login(tiqn);
1199                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1200                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1201                 ret = -1;
1202                 goto out;
1203         }
1204         conn->tpg_np = tpg_np;
1205         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1206         /*
1207          * Setup crc32c modules from libcrypto
1208          */
1209         if (iscsi_login_setup_crypto(conn) < 0) {
1210                 pr_err("iscsi_login_setup_crypto() failed\n");
1211                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1212                 iscsit_put_tiqn_for_login(tiqn);
1213                 conn->tpg = NULL;
1214                 ret = -1;
1215                 goto out;
1216         }
1217         /*
1218          * Serialize access across the struct iscsi_portal_group to
1219          * process login attempt.
1220          */
1221         if (iscsit_access_np(np, conn->tpg) < 0) {
1222                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1223                 iscsit_put_tiqn_for_login(tiqn);
1224                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1225                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1226                 conn->tpg = NULL;
1227                 ret = -1;
1228                 goto out;
1229         }
1230
1231         /*
1232          * conn->sess->node_acl will be set when the referenced
1233          * struct iscsi_session is located from received ISID+TSIH in
1234          * iscsi_login_non_zero_tsih_s2().
1235          */
1236         if (!login->leading_connection) {
1237                 ret = 0;
1238                 goto out;
1239         }
1240
1241         /*
1242          * This value is required in iscsi_login_zero_tsih_s2()
1243          */
1244         sess->sess_ops->SessionType = 0;
1245
1246         /*
1247          * Locate incoming Initiator IQN reference from Storage Node.
1248          */
1249         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1250                         &conn->tpg->tpg_se_tpg, i_buf);
1251         if (!sess->se_sess->se_node_acl) {
1252                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1253                         " access iSCSI target portal group: %hu.\n",
1254                                 i_buf, conn->tpg->tpgt);
1255                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1256                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1257                 ret = -1;
1258                 goto out;
1259         }
1260         se_nacl = sess->se_sess->se_node_acl;
1261         queue_depth = se_nacl->queue_depth;
1262         /*
1263          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1264          * depth for non immediate commands, plus extra tags for immediate
1265          * commands.
1266          *
1267          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1268          * in per-cpu-ida tag allocation logic + small queue_depth.
1269          */
1270 alloc_tags:
1271         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1272         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1273         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1274
1275         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1276         if (ret < 0) {
1277                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1278                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1279                 ret = -1;
1280         }
1281 out:
1282         kfree(tmpbuf);
1283         return ret;
1284 }
1285
1286 int iscsi_target_start_negotiation(
1287         struct iscsi_login *login,
1288         struct iscsi_conn *conn)
1289 {
1290         int ret;
1291
1292         if (conn->sock) {
1293                 struct sock *sk = conn->sock->sk;
1294
1295                 write_lock_bh(&sk->sk_callback_lock);
1296                 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1297                 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1298                 write_unlock_bh(&sk->sk_callback_lock);
1299         }
1300         /*
1301          * If iscsi_target_do_login returns zero to signal more PDU
1302          * exchanges are required to complete the login, go ahead and
1303          * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1304          * is still active.
1305          *
1306          * Otherwise if TCP connection dropped asynchronously, go ahead
1307          * and perform connection cleanup now.
1308          */
1309         ret = iscsi_target_do_login(conn, login);
1310         if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1311                 ret = -1;
1312
1313         if (ret < 0) {
1314                 cancel_delayed_work_sync(&conn->login_work);
1315                 iscsi_target_restore_sock_callbacks(conn);
1316                 iscsi_remove_failed_auth_entry(conn);
1317         }
1318         if (ret != 0)
1319                 iscsi_target_nego_release(conn);
1320
1321         return ret;
1322 }
1323
1324 void iscsi_target_nego_release(struct iscsi_conn *conn)
1325 {
1326         struct iscsi_login *login = conn->conn_login;
1327
1328         if (!login)
1329                 return;
1330
1331         kfree(login->req_buf);
1332         kfree(login->rsp_buf);
1333         kfree(login);
1334
1335         conn->conn_login = NULL;
1336 }