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