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 struct conn_timeout {
 565         struct timer_list timer;
 566         struct iscsi_conn *conn;
 567 };
 568
 569 static void iscsi_target_login_timeout(struct timer_list *t)
 570 {
 571         struct conn_timeout *timeout = from_timer(timeout, t, timer);
 572         struct iscsi_conn *conn = timeout->conn;
 573
 574         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 575
 576         if (conn->login_kworker) {
 577                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 578                          conn->login_kworker->comm, conn->login_kworker->pid);
 579                 send_sig(SIGINT, conn->login_kworker, 1);
 580         }
 581 }
 582
 583 static void iscsi_target_do_login_rx(struct work_struct *work)
 584 {
 585         struct iscsi_conn *conn = container_of(work,
 586                                 struct iscsi_conn, login_work.work);
 587         struct iscsi_login *login = conn->login;
 588         struct iscsi_np *np = login->np;
 589         struct iscsi_portal_group *tpg = conn->tpg;
 590         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 591         struct conn_timeout timeout;
 592         int rc, zero_tsih = login->zero_tsih;
 593         bool state;
 594
 595         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 596                         conn, current->comm, current->pid);
 597         /*
 598          * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
 599          * before initial PDU processing in iscsi_target_start_negotiation()
 600          * has completed, go ahead and retry until it's cleared.
 601          *
 602          * Otherwise if the TCP connection drops while this is occuring,
 603          * iscsi_target_start_negotiation() will detect the failure, call
 604          * cancel_delayed_work_sync(&conn->login_work), and cleanup the
 605          * remaining iscsi connection resources from iscsi_np process context.
 606          */
 607         if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
 608                 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
 609                 return;
 610         }
 611
 612         spin_lock(&tpg->tpg_state_lock);
 613         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 614         spin_unlock(&tpg->tpg_state_lock);
 615
 616         if (!state) {
 617                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 618                 goto err;
 619         }
 620
 621         if (iscsi_target_sk_check_close(conn)) {
 622                 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 623                 goto err;
 624         }
 625
 626         conn->login_kworker = current;
 627         allow_signal(SIGINT);
 628
 629         timeout.conn = conn;
 630         timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0);
 631         mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
 632         pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid);
 633
 634         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 635         del_timer_sync(&timeout.timer);
 636         destroy_timer_on_stack(&timeout.timer);
 637         flush_signals(current);
 638         conn->login_kworker = NULL;
 639
 640         if (rc < 0)
 641                 goto err;
 642
 643         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 644                         conn, current->comm, current->pid);
 645
 646         rc = iscsi_target_do_login(conn, login);
 647         if (rc < 0) {
 648                 goto err;
 649         } else if (!rc) {
 650                 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
 651                         goto err;
 652         } else if (rc == 1) {
 653                 iscsi_target_nego_release(conn);
 654                 iscsi_post_login_handler(np, conn, zero_tsih);
 655                 iscsit_deaccess_np(np, tpg, tpg_np);
 656         }
 657         return;
 658
 659 err:
 660         iscsi_target_restore_sock_callbacks(conn);
 661         iscsi_target_login_drop(conn, login);
 662         iscsit_deaccess_np(np, tpg, tpg_np);
 663 }
 664
 665 static void iscsi_target_sk_state_change(struct sock *sk)
 666 {
 667         struct iscsi_conn *conn;
 668         void (*orig_state_change)(struct sock *);
 669         bool state;
 670
 671         pr_debug("Entering iscsi_target_sk_state_change\n");
 672
 673         write_lock_bh(&sk->sk_callback_lock);
 674         conn = sk->sk_user_data;
 675         if (!conn) {
 676                 write_unlock_bh(&sk->sk_callback_lock);
 677                 return;
 678         }
 679         orig_state_change = conn->orig_state_change;
 680
 681         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 682                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 683                          conn);
 684                 write_unlock_bh(&sk->sk_callback_lock);
 685                 orig_state_change(sk);
 686                 return;
 687         }
 688         state = __iscsi_target_sk_check_close(sk);
 689         pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
 690
 691         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 692                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 693                          " conn: %p\n", conn);
 694                 if (state)
 695                         set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 696                 write_unlock_bh(&sk->sk_callback_lock);
 697                 orig_state_change(sk);
 698                 return;
 699         }
 700         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 701                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 702                          conn);
 703                 write_unlock_bh(&sk->sk_callback_lock);
 704                 orig_state_change(sk);
 705                 return;
 706         }
 707         /*
 708          * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
 709          * but only queue conn->login_work -> iscsi_target_do_login_rx()
 710          * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
 711          *
 712          * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
 713          * will detect the dropped TCP connection from delayed workqueue context.
 714          *
 715          * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
 716          * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
 717          * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
 718          * via iscsi_target_sk_check_and_clear() is responsible for detecting the
 719          * dropped TCP connection in iscsi_np process context, and cleaning up
 720          * the remaining iscsi connection resources.
 721          */
 722         if (state) {
 723                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 724                 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 725                 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
 726                 write_unlock_bh(&sk->sk_callback_lock);
 727
 728                 orig_state_change(sk);
 729
 730                 if (!state)
 731                         schedule_delayed_work(&conn->login_work, 0);
 732                 return;
 733         }
 734         write_unlock_bh(&sk->sk_callback_lock);
 735
 736         orig_state_change(sk);
 737 }
 738
 739 /*
 740  *      NOTE: We check for existing sessions or connections AFTER the initiator
 741  *      has been successfully authenticated in order to protect against faked
 742  *      ISID/TSIH combinations.
 743  */
 744 static int iscsi_target_check_for_existing_instances(
 745         struct iscsi_conn *conn,
 746         struct iscsi_login *login)
 747 {
 748         if (login->checked_for_existing)
 749                 return 0;
 750
 751         login->checked_for_existing = 1;
 752
 753         if (!login->tsih)
 754                 return iscsi_check_for_session_reinstatement(conn);
 755         else
 756                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 757                                 login->initial_exp_statsn);
 758 }
 759
 760 static int iscsi_target_do_authentication(
 761         struct iscsi_conn *conn,
 762         struct iscsi_login *login)
 763 {
 764         int authret;
 765         u32 payload_length;
 766         struct iscsi_param *param;
 767         struct iscsi_login_req *login_req;
 768         struct iscsi_login_rsp *login_rsp;
 769
 770         login_req = (struct iscsi_login_req *) login->req;
 771         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 772         payload_length = ntoh24(login_req->dlength);
 773
 774         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 775         if (!param)
 776                 return -1;
 777
 778         authret = iscsi_handle_authentication(
 779                         conn,
 780                         login->req_buf,
 781                         login->rsp_buf,
 782                         payload_length,
 783                         &login->rsp_length,
 784                         param->value);
 785         switch (authret) {
 786         case 0:
 787                 pr_debug("Received OK response"
 788                 " from LIO Authentication, continuing.\n");
 789                 break;
 790         case 1:
 791                 pr_debug("iSCSI security negotiation"
 792                         " completed successfully.\n");
 793                 login->auth_complete = 1;
 794                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 795                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 796                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 797                                              ISCSI_FLAG_LOGIN_TRANSIT);
 798                         login->current_stage = 1;
 799                 }
 800                 return iscsi_target_check_for_existing_instances(
 801                                 conn, login);
 802         case 2:
 803                 pr_err("Security negotiation"
 804                         " failed.\n");
 805                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 806                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 807                 return -1;
 808         default:
 809                 pr_err("Received unknown error %d from LIO"
 810                                 " Authentication\n", authret);
 811                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 812                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 813                 return -1;
 814         }
 815
 816         return 0;
 817 }
 818
 819 static int iscsi_target_handle_csg_zero(
 820         struct iscsi_conn *conn,
 821         struct iscsi_login *login)
 822 {
 823         int ret;
 824         u32 payload_length;
 825         struct iscsi_param *param;
 826         struct iscsi_login_req *login_req;
 827         struct iscsi_login_rsp *login_rsp;
 828
 829         login_req = (struct iscsi_login_req *) login->req;
 830         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 831         payload_length = ntoh24(login_req->dlength);
 832
 833         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 834         if (!param)
 835                 return -1;
 836
 837         ret = iscsi_decode_text_input(
 838                         PHASE_SECURITY|PHASE_DECLARATIVE,
 839                         SENDER_INITIATOR|SENDER_RECEIVER,
 840                         login->req_buf,
 841                         payload_length,
 842                         conn);
 843         if (ret < 0)
 844                 return -1;
 845
 846         if (ret > 0) {
 847                 if (login->auth_complete) {
 848                         pr_err("Initiator has already been"
 849                                 " successfully authenticated, but is still"
 850                                 " sending %s keys.\n", param->value);
 851                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 852                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 853                         return -1;
 854                 }
 855
 856                 goto do_auth;
 857         } else if (!payload_length) {
 858                 pr_err("Initiator sent zero length security payload,"
 859                        " login failed\n");
 860                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 861                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 862                 return -1;
 863         }
 864
 865         if (login->first_request)
 866                 if (iscsi_target_check_first_request(conn, login) < 0)
 867                         return -1;
 868
 869         ret = iscsi_encode_text_output(
 870                         PHASE_SECURITY|PHASE_DECLARATIVE,
 871                         SENDER_TARGET,
 872                         login->rsp_buf,
 873                         &login->rsp_length,
 874                         conn->param_list,
 875                         conn->tpg->tpg_attrib.login_keys_workaround);
 876         if (ret < 0)
 877                 return -1;
 878
 879         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 880                 if (conn->tpg->tpg_attrib.authentication &&
 881                     !strncmp(param->value, NONE, 4)) {
 882                         pr_err("Initiator sent AuthMethod=None but"
 883                                 " Target is enforcing iSCSI Authentication,"
 884                                         " login failed.\n");
 885                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 886                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 887                         return -1;
 888                 }
 889
 890                 if (conn->tpg->tpg_attrib.authentication &&
 891                     !login->auth_complete)
 892                         return 0;
 893
 894                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 895                         return 0;
 896
 897                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 898                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 899                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 900                                             ISCSI_FLAG_LOGIN_TRANSIT;
 901                         login->current_stage = 1;
 902                 }
 903         }
 904
 905         return 0;
 906 do_auth:
 907         return iscsi_target_do_authentication(conn, login);
 908 }
 909
 910 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 911 {
 912         int ret;
 913         u32 payload_length;
 914         struct iscsi_login_req *login_req;
 915         struct iscsi_login_rsp *login_rsp;
 916
 917         login_req = (struct iscsi_login_req *) login->req;
 918         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 919         payload_length = ntoh24(login_req->dlength);
 920
 921         ret = iscsi_decode_text_input(
 922                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 923                         SENDER_INITIATOR|SENDER_RECEIVER,
 924                         login->req_buf,
 925                         payload_length,
 926                         conn);
 927         if (ret < 0) {
 928                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 929                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 930                 return -1;
 931         }
 932
 933         if (login->first_request)
 934                 if (iscsi_target_check_first_request(conn, login) < 0)
 935                         return -1;
 936
 937         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 938                 return -1;
 939
 940         ret = iscsi_encode_text_output(
 941                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 942                         SENDER_TARGET,
 943                         login->rsp_buf,
 944                         &login->rsp_length,
 945                         conn->param_list,
 946                         conn->tpg->tpg_attrib.login_keys_workaround);
 947         if (ret < 0) {
 948                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 949                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 950                 return -1;
 951         }
 952
 953         if (!login->auth_complete &&
 954              conn->tpg->tpg_attrib.authentication) {
 955                 pr_err("Initiator is requesting CSG: 1, has not been"
 956                          " successfully authenticated, and the Target is"
 957                         " enforcing iSCSI Authentication, login failed.\n");
 958                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 959                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 960                 return -1;
 961         }
 962
 963         if (!iscsi_check_negotiated_keys(conn->param_list))
 964                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 965                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 966                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 967                                             ISCSI_FLAG_LOGIN_TRANSIT;
 968
 969         return 0;
 970 }
 971
 972 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 973 {
 974         int pdu_count = 0;
 975         struct iscsi_login_req *login_req;
 976         struct iscsi_login_rsp *login_rsp;
 977
 978         login_req = (struct iscsi_login_req *) login->req;
 979         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 980
 981         while (1) {
 982                 if (++pdu_count > MAX_LOGIN_PDUS) {
 983                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 984                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 985                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 986                         return -1;
 987                 }
 988
 989                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 990                 case 0:
 991                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 992                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 993                                 return -1;
 994                         break;
 995                 case 1:
 996                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 997                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 998                                 return -1;
 999                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1000                                 /*
1001                                  * Check to make sure the TCP connection has not
1002                                  * dropped asynchronously while session reinstatement
1003                                  * was occuring in this kthread context, before
1004                                  * transitioning to full feature phase operation.
1005                                  */
1006                                 if (iscsi_target_sk_check_close(conn))
1007                                         return -1;
1008
1009                                 login->tsih = conn->sess->tsih;
1010                                 login->login_complete = 1;
1011                                 iscsi_target_restore_sock_callbacks(conn);
1012                                 if (iscsi_target_do_tx_login_io(conn,
1013                                                 login) < 0)
1014                                         return -1;
1015                                 return 1;
1016                         }
1017                         break;
1018                 default:
1019                         pr_err("Illegal CSG: %d received from"
1020                                 " Initiator, protocol error.\n",
1021                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1022                         break;
1023                 }
1024
1025                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1026                         return -1;
1027
1028                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1029                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1030                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1031                 }
1032                 break;
1033         }
1034
1035         return 0;
1036 }
1037
1038 static void iscsi_initiatorname_tolower(
1039         char *param_buf)
1040 {
1041         char *c;
1042         u32 iqn_size = strlen(param_buf), i;
1043
1044         for (i = 0; i < iqn_size; i++) {
1045                 c = &param_buf[i];
1046                 if (!isupper(*c))
1047                         continue;
1048
1049                 *c = tolower(*c);
1050         }
1051 }
1052
1053 /*
1054  * Processes the first Login Request..
1055  */
1056 int iscsi_target_locate_portal(
1057         struct iscsi_np *np,
1058         struct iscsi_conn *conn,
1059         struct iscsi_login *login)
1060 {
1061         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1062         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1063         struct iscsi_session *sess = conn->sess;
1064         struct iscsi_tiqn *tiqn;
1065         struct iscsi_tpg_np *tpg_np = NULL;
1066         struct iscsi_login_req *login_req;
1067         struct se_node_acl *se_nacl;
1068         u32 payload_length, queue_depth = 0;
1069         int sessiontype = 0, ret = 0, tag_num, tag_size;
1070
1071         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1072         iscsi_target_set_sock_callbacks(conn);
1073
1074         login->np = np;
1075
1076         login_req = (struct iscsi_login_req *) login->req;
1077         payload_length = ntoh24(login_req->dlength);
1078
1079         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1080         if (!tmpbuf) {
1081                 pr_err("Unable to allocate memory for tmpbuf.\n");
1082                 return -1;
1083         }
1084
1085         memcpy(tmpbuf, login->req_buf, payload_length);
1086         tmpbuf[payload_length] = '\0';
1087         start = tmpbuf;
1088         end = (start + payload_length);
1089
1090         /*
1091          * Locate the initial keys expected from the Initiator node in
1092          * the first login request in order to progress with the login phase.
1093          */
1094         while (start < end) {
1095                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1096                         ret = -1;
1097                         goto out;
1098                 }
1099
1100                 if (!strncmp(key, "InitiatorName", 13))
1101                         i_buf = value;
1102                 else if (!strncmp(key, "SessionType", 11))
1103                         s_buf = value;
1104                 else if (!strncmp(key, "TargetName", 10))
1105                         t_buf = value;
1106
1107                 start += strlen(key) + strlen(value) + 2;
1108         }
1109         /*
1110          * See 5.3.  Login Phase.
1111          */
1112         if (!i_buf) {
1113                 pr_err("InitiatorName key not received"
1114                         " in first login request.\n");
1115                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1116                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1117                 ret = -1;
1118                 goto out;
1119         }
1120         /*
1121          * Convert the incoming InitiatorName to lowercase following
1122          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1123          * are NOT case sensitive.
1124          */
1125         iscsi_initiatorname_tolower(i_buf);
1126
1127         if (!s_buf) {
1128                 if (!login->leading_connection)
1129                         goto get_target;
1130
1131                 pr_err("SessionType key not received"
1132                         " in first login request.\n");
1133                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1134                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1135                 ret = -1;
1136                 goto out;
1137         }
1138
1139         /*
1140          * Use default portal group for discovery sessions.
1141          */
1142         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1143         if (!sessiontype) {
1144                 conn->tpg = iscsit_global->discovery_tpg;
1145                 if (!login->leading_connection)
1146                         goto get_target;
1147
1148                 sess->sess_ops->SessionType = 1;
1149                 /*
1150                  * Setup crc32c modules from libcrypto
1151                  */
1152                 if (iscsi_login_setup_crypto(conn) < 0) {
1153                         pr_err("iscsi_login_setup_crypto() failed\n");
1154                         ret = -1;
1155                         goto out;
1156                 }
1157                 /*
1158                  * Serialize access across the discovery struct iscsi_portal_group to
1159                  * process login attempt.
1160                  */
1161                 if (iscsit_access_np(np, conn->tpg) < 0) {
1162                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1163                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1164                         ret = -1;
1165                         goto out;
1166                 }
1167                 ret = 0;
1168                 goto alloc_tags;
1169         }
1170
1171 get_target:
1172         if (!t_buf) {
1173                 pr_err("TargetName key not received"
1174                         " in first login request while"
1175                         " SessionType=Normal.\n");
1176                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1177                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1178                 ret = -1;
1179                 goto out;
1180         }
1181
1182         /*
1183          * Locate Target IQN from Storage Node.
1184          */
1185         tiqn = iscsit_get_tiqn_for_login(t_buf);
1186         if (!tiqn) {
1187                 pr_err("Unable to locate Target IQN: %s in"
1188                         " Storage Node\n", t_buf);
1189                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1190                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1191                 ret = -1;
1192                 goto out;
1193         }
1194         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1195
1196         /*
1197          * Locate Target Portal Group from Storage Node.
1198          */
1199         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1200         if (!conn->tpg) {
1201                 pr_err("Unable to locate Target Portal Group"
1202                                 " on %s\n", tiqn->tiqn);
1203                 iscsit_put_tiqn_for_login(tiqn);
1204                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1205                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1206                 ret = -1;
1207                 goto out;
1208         }
1209         conn->tpg_np = tpg_np;
1210         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1211         /*
1212          * Setup crc32c modules from libcrypto
1213          */
1214         if (iscsi_login_setup_crypto(conn) < 0) {
1215                 pr_err("iscsi_login_setup_crypto() failed\n");
1216                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1217                 iscsit_put_tiqn_for_login(tiqn);
1218                 conn->tpg = NULL;
1219                 ret = -1;
1220                 goto out;
1221         }
1222         /*
1223          * Serialize access across the struct iscsi_portal_group to
1224          * process login attempt.
1225          */
1226         if (iscsit_access_np(np, conn->tpg) < 0) {
1227                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1228                 iscsit_put_tiqn_for_login(tiqn);
1229                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1230                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1231                 conn->tpg = NULL;
1232                 ret = -1;
1233                 goto out;
1234         }
1235
1236         /*
1237          * conn->sess->node_acl will be set when the referenced
1238          * struct iscsi_session is located from received ISID+TSIH in
1239          * iscsi_login_non_zero_tsih_s2().
1240          */
1241         if (!login->leading_connection) {
1242                 ret = 0;
1243                 goto out;
1244         }
1245
1246         /*
1247          * This value is required in iscsi_login_zero_tsih_s2()
1248          */
1249         sess->sess_ops->SessionType = 0;
1250
1251         /*
1252          * Locate incoming Initiator IQN reference from Storage Node.
1253          */
1254         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1255                         &conn->tpg->tpg_se_tpg, i_buf);
1256         if (!sess->se_sess->se_node_acl) {
1257                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1258                         " access iSCSI target portal group: %hu.\n",
1259                                 i_buf, conn->tpg->tpgt);
1260                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1261                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1262                 ret = -1;
1263                 goto out;
1264         }
1265         se_nacl = sess->se_sess->se_node_acl;
1266         queue_depth = se_nacl->queue_depth;
1267         /*
1268          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1269          * depth for non immediate commands, plus extra tags for immediate
1270          * commands.
1271          *
1272          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1273          * in per-cpu-ida tag allocation logic + small queue_depth.
1274          */
1275 alloc_tags:
1276         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1277         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1278         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1279
1280         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1281         if (ret < 0) {
1282                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1283                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1284                 ret = -1;
1285         }
1286 out:
1287         kfree(tmpbuf);
1288         return ret;
1289 }
1290
1291 int iscsi_target_start_negotiation(
1292         struct iscsi_login *login,
1293         struct iscsi_conn *conn)
1294 {
1295         int ret;
1296
1297         if (conn->sock) {
1298                 struct sock *sk = conn->sock->sk;
1299
1300                 write_lock_bh(&sk->sk_callback_lock);
1301                 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1302                 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1303                 write_unlock_bh(&sk->sk_callback_lock);
1304         }
1305         /*
1306          * If iscsi_target_do_login returns zero to signal more PDU
1307          * exchanges are required to complete the login, go ahead and
1308          * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1309          * is still active.
1310          *
1311          * Otherwise if TCP connection dropped asynchronously, go ahead
1312          * and perform connection cleanup now.
1313          */
1314         ret = iscsi_target_do_login(conn, login);
1315         if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1316                 ret = -1;
1317
1318         if (ret < 0) {
1319                 cancel_delayed_work_sync(&conn->login_work);
1320                 iscsi_target_restore_sock_callbacks(conn);
1321                 iscsi_remove_failed_auth_entry(conn);
1322         }
1323         if (ret != 0)
1324                 iscsi_target_nego_release(conn);
1325
1326         return ret;
1327 }
1328
1329 void iscsi_target_nego_release(struct iscsi_conn *conn)
1330 {
1331         struct iscsi_login *login = conn->conn_login;
1332
1333         if (!login)
1334                 return;
1335
1336         kfree(login->req_buf);
1337         kfree(login->rsp_buf);
1338         kfree(login);
1339
1340         conn->conn_login = NULL;
1341 }