drivers/target/iscsi/iscsi_target_nego.c

   1 /*******************************************************************************
   2  * This file contains main functions related to iSCSI Parameter negotiation.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/ctype.h>
  20 #include <linux/kthread.h>
  21 #include <scsi/iscsi_proto.h>
  22 #include <target/target_core_base.h>
  23 #include <target/target_core_fabric.h>
  24 #include <target/iscsi/iscsi_transport.h>
  25
  26 #include <target/iscsi/iscsi_target_core.h>
  27 #include "iscsi_target_parameters.h"
  28 #include "iscsi_target_login.h"
  29 #include "iscsi_target_nego.h"
  30 #include "iscsi_target_tpg.h"
  31 #include "iscsi_target_util.h"
  32 #include "iscsi_target.h"
  33 #include "iscsi_target_auth.h"
  34
  35 #define MAX_LOGIN_PDUS  7
  36 #define TEXT_LEN        4096
  37
  38 void convert_null_to_semi(char *buf, int len)
  39 {
  40         int i;
  41
  42         for (i = 0; i < len; i++)
  43                 if (buf[i] == '\0')
  44                         buf[i] = ';';
  45 }
  46
  47 static int strlen_semi(char *buf)
  48 {
  49         int i = 0;
  50
  51         while (buf[i] != '\0') {
  52                 if (buf[i] == ';')
  53                         return i;
  54                 i++;
  55         }
  56
  57         return -1;
  58 }
  59
  60 int extract_param(
  61         const char *in_buf,
  62         const char *pattern,
  63         unsigned int max_length,
  64         char *out_buf,
  65         unsigned char *type)
  66 {
  67         char *ptr;
  68         int len;
  69
  70         if (!in_buf || !pattern || !out_buf || !type)
  71                 return -1;
  72
  73         ptr = strstr(in_buf, pattern);
  74         if (!ptr)
  75                 return -1;
  76
  77         ptr = strstr(ptr, "=");
  78         if (!ptr)
  79                 return -1;
  80
  81         ptr += 1;
  82         if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) {
  83                 ptr += 2; /* skip 0x */
  84                 *type = HEX;
  85         } else
  86                 *type = DECIMAL;
  87
  88         len = strlen_semi(ptr);
  89         if (len < 0)
  90                 return -1;
  91
  92         if (len >= max_length) {
  93                 pr_err("Length of input: %d exceeds max_length:"
  94                         " %d\n", len, max_length);
  95                 return -1;
  96         }
  97         memcpy(out_buf, ptr, len);
  98         out_buf[len] = '\0';
  99
 100         return 0;
 101 }
 102
 103 static u32 iscsi_handle_authentication(
 104         struct iscsi_conn *conn,
 105         char *in_buf,
 106         char *out_buf,
 107         int in_length,
 108         int *out_length,
 109         unsigned char *authtype)
 110 {
 111         struct iscsi_session *sess = conn->sess;
 112         struct iscsi_node_auth *auth;
 113         struct iscsi_node_acl *iscsi_nacl;
 114         struct iscsi_portal_group *iscsi_tpg;
 115         struct se_node_acl *se_nacl;
 116
 117         if (!sess->sess_ops->SessionType) {
 118                 /*
 119                  * For SessionType=Normal
 120                  */
 121                 se_nacl = conn->sess->se_sess->se_node_acl;
 122                 if (!se_nacl) {
 123                         pr_err("Unable to locate struct se_node_acl for"
 124                                         " CHAP auth\n");
 125                         return -1;
 126                 }
 127                 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 128                                 se_node_acl);
 129                 if (!iscsi_nacl) {
 130                         pr_err("Unable to locate struct iscsi_node_acl for"
 131                                         " CHAP auth\n");
 132                         return -1;
 133                 }
 134
 135                 if (se_nacl->dynamic_node_acl) {
 136                         iscsi_tpg = container_of(se_nacl->se_tpg,
 137                                         struct iscsi_portal_group, tpg_se_tpg);
 138
 139                         auth = &iscsi_tpg->tpg_demo_auth;
 140                 } else {
 141                         iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl,
 142                                                   se_node_acl);
 143
 144                         auth = &iscsi_nacl->node_auth;
 145                 }
 146         } else {
 147                 /*
 148                  * For SessionType=Discovery
 149                  */
 150                 auth = &iscsit_global->discovery_acl.node_auth;
 151         }
 152
 153         if (strstr("CHAP", authtype))
 154                 strcpy(conn->sess->auth_type, "CHAP");
 155         else
 156                 strcpy(conn->sess->auth_type, NONE);
 157
 158         if (strstr("None", authtype))
 159                 return 1;
 160 #ifdef CANSRP
 161         else if (strstr("SRP", authtype))
 162                 return srp_main_loop(conn, auth, in_buf, out_buf,
 163                                 &in_length, out_length);
 164 #endif
 165         else if (strstr("CHAP", authtype))
 166                 return chap_main_loop(conn, auth, in_buf, out_buf,
 167                                 &in_length, out_length);
 168         else if (strstr("SPKM1", authtype))
 169                 return 2;
 170         else if (strstr("SPKM2", authtype))
 171                 return 2;
 172         else if (strstr("KRB5", authtype))
 173                 return 2;
 174         else
 175                 return 2;
 176 }
 177
 178 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn)
 179 {
 180         kfree(conn->auth_protocol);
 181 }
 182
 183 int iscsi_target_check_login_request(
 184         struct iscsi_conn *conn,
 185         struct iscsi_login *login)
 186 {
 187         int req_csg, req_nsg;
 188         u32 payload_length;
 189         struct iscsi_login_req *login_req;
 190
 191         login_req = (struct iscsi_login_req *) login->req;
 192         payload_length = ntoh24(login_req->dlength);
 193
 194         switch (login_req->opcode & ISCSI_OPCODE_MASK) {
 195         case ISCSI_OP_LOGIN:
 196                 break;
 197         default:
 198                 pr_err("Received unknown opcode 0x%02x.\n",
 199                                 login_req->opcode & ISCSI_OPCODE_MASK);
 200                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 201                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 202                 return -1;
 203         }
 204
 205         if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) &&
 206             (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 207                 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE"
 208                         " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n");
 209                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 210                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 211                 return -1;
 212         }
 213
 214         req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
 215         req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags);
 216
 217         if (req_csg != login->current_stage) {
 218                 pr_err("Initiator unexpectedly changed login stage"
 219                         " from %d to %d, login failed.\n", login->current_stage,
 220                         req_csg);
 221                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 222                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 223                 return -1;
 224         }
 225
 226         if ((req_nsg == 2) || (req_csg >= 2) ||
 227            ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) &&
 228             (req_nsg <= req_csg))) {
 229                 pr_err("Illegal login_req->flags Combination, CSG: %d,"
 230                         " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg,
 231                         req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT));
 232                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 233                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 234                 return -1;
 235         }
 236
 237         if ((login_req->max_version != login->version_max) ||
 238             (login_req->min_version != login->version_min)) {
 239                 pr_err("Login request changed Version Max/Nin"
 240                         " unexpectedly to 0x%02x/0x%02x, protocol error\n",
 241                         login_req->max_version, login_req->min_version);
 242                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 243                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 244                 return -1;
 245         }
 246
 247         if (memcmp(login_req->isid, login->isid, 6) != 0) {
 248                 pr_err("Login request changed ISID unexpectedly,"
 249                                 " protocol error.\n");
 250                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 251                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 252                 return -1;
 253         }
 254
 255         if (login_req->itt != login->init_task_tag) {
 256                 pr_err("Login request changed ITT unexpectedly to"
 257                         " 0x%08x, protocol error.\n", login_req->itt);
 258                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 259                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 260                 return -1;
 261         }
 262
 263         if (payload_length > MAX_KEY_VALUE_PAIRS) {
 264                 pr_err("Login request payload exceeds default"
 265                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 266                                 MAX_KEY_VALUE_PAIRS);
 267                 return -1;
 268         }
 269
 270         return 0;
 271 }
 272 EXPORT_SYMBOL(iscsi_target_check_login_request);
 273
 274 static int iscsi_target_check_first_request(
 275         struct iscsi_conn *conn,
 276         struct iscsi_login *login)
 277 {
 278         struct iscsi_param *param = NULL;
 279         struct se_node_acl *se_nacl;
 280
 281         login->first_request = 0;
 282
 283         list_for_each_entry(param, &conn->param_list->param_list, p_list) {
 284                 if (!strncmp(param->name, SESSIONTYPE, 11)) {
 285                         if (!IS_PSTATE_ACCEPTOR(param)) {
 286                                 pr_err("SessionType key not received"
 287                                         " in first login request.\n");
 288                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 289                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 290                                 return -1;
 291                         }
 292                         if (!strncmp(param->value, DISCOVERY, 9))
 293                                 return 0;
 294                 }
 295
 296                 if (!strncmp(param->name, INITIATORNAME, 13)) {
 297                         if (!IS_PSTATE_ACCEPTOR(param)) {
 298                                 if (!login->leading_connection)
 299                                         continue;
 300
 301                                 pr_err("InitiatorName key not received"
 302                                         " in first login request.\n");
 303                                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 304                                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
 305                                 return -1;
 306                         }
 307
 308                         /*
 309                          * For non-leading connections, double check that the
 310                          * received InitiatorName matches the existing session's
 311                          * struct iscsi_node_acl.
 312                          */
 313                         if (!login->leading_connection) {
 314                                 se_nacl = conn->sess->se_sess->se_node_acl;
 315                                 if (!se_nacl) {
 316                                         pr_err("Unable to locate"
 317                                                 " struct se_node_acl\n");
 318                                         iscsit_tx_login_rsp(conn,
 319                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 320                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 321                                         return -1;
 322                                 }
 323
 324                                 if (strcmp(param->value,
 325                                                 se_nacl->initiatorname)) {
 326                                         pr_err("Incorrect"
 327                                                 " InitiatorName: %s for this"
 328                                                 " iSCSI Initiator Node.\n",
 329                                                 param->value);
 330                                         iscsit_tx_login_rsp(conn,
 331                                                         ISCSI_STATUS_CLS_INITIATOR_ERR,
 332                                                         ISCSI_LOGIN_STATUS_TGT_NOT_FOUND);
 333                                         return -1;
 334                                 }
 335                         }
 336                 }
 337         }
 338
 339         return 0;
 340 }
 341
 342 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login)
 343 {
 344         u32 padding = 0;
 345         struct iscsi_login_rsp *login_rsp;
 346
 347         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 348
 349         login_rsp->opcode               = ISCSI_OP_LOGIN_RSP;
 350         hton24(login_rsp->dlength, login->rsp_length);
 351         memcpy(login_rsp->isid, login->isid, 6);
 352         login_rsp->tsih                 = cpu_to_be16(login->tsih);
 353         login_rsp->itt                  = login->init_task_tag;
 354         login_rsp->statsn               = cpu_to_be32(conn->stat_sn++);
 355         login_rsp->exp_cmdsn            = cpu_to_be32(conn->sess->exp_cmd_sn);
 356         login_rsp->max_cmdsn            = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
 357
 358         pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
 359                 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
 360                 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
 361                 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
 362                 ntohl(login_rsp->statsn), login->rsp_length);
 363
 364         padding = ((-login->rsp_length) & 3);
 365         /*
 366          * Before sending the last login response containing the transition
 367          * bit for full-feature-phase, go ahead and start up TX/RX threads
 368          * now to avoid potential resource allocation failures after the
 369          * final login response has been sent.
 370          */
 371         if (login->login_complete) {
 372                 int rc = iscsit_start_kthreads(conn);
 373                 if (rc) {
 374                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 375                                             ISCSI_LOGIN_STATUS_NO_RESOURCES);
 376                         return -1;
 377                 }
 378         }
 379
 380         if (conn->conn_transport->iscsit_put_login_tx(conn, login,
 381                                         login->rsp_length + padding) < 0)
 382                 goto err;
 383
 384         login->rsp_length               = 0;
 385
 386         return 0;
 387
 388 err:
 389         if (login->login_complete) {
 390                 if (conn->rx_thread && conn->rx_thread_active) {
 391                         send_sig(SIGINT, conn->rx_thread, 1);
 392                         complete(&conn->rx_login_comp);
 393                         kthread_stop(conn->rx_thread);
 394                 }
 395                 if (conn->tx_thread && conn->tx_thread_active) {
 396                         send_sig(SIGINT, conn->tx_thread, 1);
 397                         kthread_stop(conn->tx_thread);
 398                 }
 399                 spin_lock(&iscsit_global->ts_bitmap_lock);
 400                 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
 401                                       get_order(1));
 402                 spin_unlock(&iscsit_global->ts_bitmap_lock);
 403         }
 404         return -1;
 405 }
 406
 407 static void iscsi_target_sk_data_ready(struct sock *sk)
 408 {
 409         struct iscsi_conn *conn = sk->sk_user_data;
 410         bool rc;
 411
 412         pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 413
 414         write_lock_bh(&sk->sk_callback_lock);
 415         if (!sk->sk_user_data) {
 416                 write_unlock_bh(&sk->sk_callback_lock);
 417                 return;
 418         }
 419         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 420                 write_unlock_bh(&sk->sk_callback_lock);
 421                 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
 422                 return;
 423         }
 424         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 425                 write_unlock_bh(&sk->sk_callback_lock);
 426                 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
 427                 return;
 428         }
 429         if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 430                 write_unlock_bh(&sk->sk_callback_lock);
 431                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
 432                 return;
 433         }
 434
 435         rc = schedule_delayed_work(&conn->login_work, 0);
 436         if (!rc) {
 437                 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
 438                          " got false\n");
 439         }
 440         write_unlock_bh(&sk->sk_callback_lock);
 441 }
 442
 443 static void iscsi_target_sk_state_change(struct sock *);
 444
 445 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
 446 {
 447         struct sock *sk;
 448
 449         if (!conn->sock)
 450                 return;
 451
 452         sk = conn->sock->sk;
 453         pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
 454
 455         write_lock_bh(&sk->sk_callback_lock);
 456         sk->sk_user_data = conn;
 457         conn->orig_data_ready = sk->sk_data_ready;
 458         conn->orig_state_change = sk->sk_state_change;
 459         sk->sk_data_ready = iscsi_target_sk_data_ready;
 460         sk->sk_state_change = iscsi_target_sk_state_change;
 461         write_unlock_bh(&sk->sk_callback_lock);
 462
 463         sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
 464         sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
 465 }
 466
 467 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
 468 {
 469         struct sock *sk;
 470
 471         if (!conn->sock)
 472                 return;
 473
 474         sk = conn->sock->sk;
 475         pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
 476
 477         write_lock_bh(&sk->sk_callback_lock);
 478         if (!sk->sk_user_data) {
 479                 write_unlock_bh(&sk->sk_callback_lock);
 480                 return;
 481         }
 482         sk->sk_user_data = NULL;
 483         sk->sk_data_ready = conn->orig_data_ready;
 484         sk->sk_state_change = conn->orig_state_change;
 485         write_unlock_bh(&sk->sk_callback_lock);
 486
 487         sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
 488         sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
 489 }
 490
 491 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
 492
 493 static bool __iscsi_target_sk_check_close(struct sock *sk)
 494 {
 495         if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
 496                 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE,"
 497                         "returning FALSE\n");
 498                 return true;
 499         }
 500         return false;
 501 }
 502
 503 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn)
 504 {
 505         bool state = false;
 506
 507         if (conn->sock) {
 508                 struct sock *sk = conn->sock->sk;
 509
 510                 read_lock_bh(&sk->sk_callback_lock);
 511                 state = (__iscsi_target_sk_check_close(sk) ||
 512                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 513                 read_unlock_bh(&sk->sk_callback_lock);
 514         }
 515         return state;
 516 }
 517
 518 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag)
 519 {
 520         bool state = false;
 521
 522         if (conn->sock) {
 523                 struct sock *sk = conn->sock->sk;
 524
 525                 read_lock_bh(&sk->sk_callback_lock);
 526                 state = test_bit(flag, &conn->login_flags);
 527                 read_unlock_bh(&sk->sk_callback_lock);
 528         }
 529         return state;
 530 }
 531
 532 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag)
 533 {
 534         bool state = false;
 535
 536         if (conn->sock) {
 537                 struct sock *sk = conn->sock->sk;
 538
 539                 write_lock_bh(&sk->sk_callback_lock);
 540                 state = (__iscsi_target_sk_check_close(sk) ||
 541                          test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags));
 542                 if (!state)
 543                         clear_bit(flag, &conn->login_flags);
 544                 write_unlock_bh(&sk->sk_callback_lock);
 545         }
 546         return state;
 547 }
 548
 549 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
 550 {
 551         bool zero_tsih = login->zero_tsih;
 552
 553         iscsi_remove_failed_auth_entry(conn);
 554         iscsi_target_nego_release(conn);
 555         iscsi_target_login_sess_out(conn, zero_tsih, true);
 556 }
 557
 558 static void iscsi_target_login_timeout(unsigned long data)
 559 {
 560         struct iscsi_conn *conn = (struct iscsi_conn *)data;
 561
 562         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 563
 564         if (conn->login_kworker) {
 565                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 566                          conn->login_kworker->comm, conn->login_kworker->pid);
 567                 send_sig(SIGINT, conn->login_kworker, 1);
 568         }
 569 }
 570
 571 static void iscsi_target_do_login_rx(struct work_struct *work)
 572 {
 573         struct iscsi_conn *conn = container_of(work,
 574                                 struct iscsi_conn, login_work.work);
 575         struct iscsi_login *login = conn->login;
 576         struct iscsi_np *np = login->np;
 577         struct iscsi_portal_group *tpg = conn->tpg;
 578         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 579         struct timer_list login_timer;
 580         int rc, zero_tsih = login->zero_tsih;
 581         bool state;
 582
 583         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 584                         conn, current->comm, current->pid);
 585         /*
 586          * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready()
 587          * before initial PDU processing in iscsi_target_start_negotiation()
 588          * has completed, go ahead and retry until it's cleared.
 589          *
 590          * Otherwise if the TCP connection drops while this is occuring,
 591          * iscsi_target_start_negotiation() will detect the failure, call
 592          * cancel_delayed_work_sync(&conn->login_work), and cleanup the
 593          * remaining iscsi connection resources from iscsi_np process context.
 594          */
 595         if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) {
 596                 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10));
 597                 return;
 598         }
 599
 600         spin_lock(&tpg->tpg_state_lock);
 601         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 602         spin_unlock(&tpg->tpg_state_lock);
 603
 604         if (!state) {
 605                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 606                 goto err;
 607         }
 608
 609         if (iscsi_target_sk_check_close(conn)) {
 610                 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 611                 goto err;
 612         }
 613
 614         conn->login_kworker = current;
 615         allow_signal(SIGINT);
 616
 617         init_timer(&login_timer);
 618         login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 619         login_timer.data = (unsigned long)conn;
 620         login_timer.function = iscsi_target_login_timeout;
 621         add_timer(&login_timer);
 622         pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
 623
 624         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 625         del_timer_sync(&login_timer);
 626         flush_signals(current);
 627         conn->login_kworker = NULL;
 628
 629         if (rc < 0)
 630                 goto err;
 631
 632         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 633                         conn, current->comm, current->pid);
 634
 635         rc = iscsi_target_do_login(conn, login);
 636         if (rc < 0) {
 637                 goto err;
 638         } else if (!rc) {
 639                 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE))
 640                         goto err;
 641         } else if (rc == 1) {
 642                 iscsi_target_nego_release(conn);
 643                 iscsi_post_login_handler(np, conn, zero_tsih);
 644                 iscsit_deaccess_np(np, tpg, tpg_np);
 645         }
 646         return;
 647
 648 err:
 649         iscsi_target_restore_sock_callbacks(conn);
 650         iscsi_target_login_drop(conn, login);
 651         iscsit_deaccess_np(np, tpg, tpg_np);
 652 }
 653
 654 static void iscsi_target_do_cleanup(struct work_struct *work)
 655 {
 656         struct iscsi_conn *conn = container_of(work,
 657                                 struct iscsi_conn, login_cleanup_work.work);
 658         struct sock *sk = conn->sock->sk;
 659         struct iscsi_login *login = conn->login;
 660         struct iscsi_np *np = login->np;
 661         struct iscsi_portal_group *tpg = conn->tpg;
 662         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 663
 664         pr_debug("Entering iscsi_target_do_cleanup\n");
 665
 666         cancel_delayed_work_sync(&conn->login_work);
 667         conn->orig_state_change(sk);
 668
 669         iscsi_target_restore_sock_callbacks(conn);
 670         iscsi_target_login_drop(conn, login);
 671         iscsit_deaccess_np(np, tpg, tpg_np);
 672
 673         pr_debug("iscsi_target_do_cleanup done()\n");
 674 }
 675
 676 static void iscsi_target_sk_state_change(struct sock *sk)
 677 {
 678         struct iscsi_conn *conn;
 679         void (*orig_state_change)(struct sock *);
 680         bool state;
 681
 682         pr_debug("Entering iscsi_target_sk_state_change\n");
 683
 684         write_lock_bh(&sk->sk_callback_lock);
 685         conn = sk->sk_user_data;
 686         if (!conn) {
 687                 write_unlock_bh(&sk->sk_callback_lock);
 688                 return;
 689         }
 690         orig_state_change = conn->orig_state_change;
 691
 692         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 693                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 694                          conn);
 695                 write_unlock_bh(&sk->sk_callback_lock);
 696                 orig_state_change(sk);
 697                 return;
 698         }
 699         state = __iscsi_target_sk_check_close(sk);
 700         pr_debug("__iscsi_target_sk_close_change: state: %d\n", state);
 701
 702         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 703                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 704                          " conn: %p\n", conn);
 705                 if (state)
 706                         set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 707                 write_unlock_bh(&sk->sk_callback_lock);
 708                 orig_state_change(sk);
 709                 return;
 710         }
 711         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 712                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 713                          conn);
 714                 write_unlock_bh(&sk->sk_callback_lock);
 715                 orig_state_change(sk);
 716                 return;
 717         }
 718         /*
 719          * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED,
 720          * but only queue conn->login_work -> iscsi_target_do_login_rx()
 721          * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared.
 722          *
 723          * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close()
 724          * will detect the dropped TCP connection from delayed workqueue context.
 725          *
 726          * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial
 727          * iscsi_target_start_negotiation() is running, iscsi_target_do_login()
 728          * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation()
 729          * via iscsi_target_sk_check_and_clear() is responsible for detecting the
 730          * dropped TCP connection in iscsi_np process context, and cleaning up
 731          * the remaining iscsi connection resources.
 732          */
 733         if (state) {
 734                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 735                 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags);
 736                 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
 737                 write_unlock_bh(&sk->sk_callback_lock);
 738
 739                 orig_state_change(sk);
 740
 741                 if (!state)
 742                         schedule_delayed_work(&conn->login_work, 0);
 743                 return;
 744         }
 745         write_unlock_bh(&sk->sk_callback_lock);
 746
 747         orig_state_change(sk);
 748 }
 749
 750 /*
 751  *      NOTE: We check for existing sessions or connections AFTER the initiator
 752  *      has been successfully authenticated in order to protect against faked
 753  *      ISID/TSIH combinations.
 754  */
 755 static int iscsi_target_check_for_existing_instances(
 756         struct iscsi_conn *conn,
 757         struct iscsi_login *login)
 758 {
 759         if (login->checked_for_existing)
 760                 return 0;
 761
 762         login->checked_for_existing = 1;
 763
 764         if (!login->tsih)
 765                 return iscsi_check_for_session_reinstatement(conn);
 766         else
 767                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 768                                 login->initial_exp_statsn);
 769 }
 770
 771 static int iscsi_target_do_authentication(
 772         struct iscsi_conn *conn,
 773         struct iscsi_login *login)
 774 {
 775         int authret;
 776         u32 payload_length;
 777         struct iscsi_param *param;
 778         struct iscsi_login_req *login_req;
 779         struct iscsi_login_rsp *login_rsp;
 780
 781         login_req = (struct iscsi_login_req *) login->req;
 782         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 783         payload_length = ntoh24(login_req->dlength);
 784
 785         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 786         if (!param)
 787                 return -1;
 788
 789         authret = iscsi_handle_authentication(
 790                         conn,
 791                         login->req_buf,
 792                         login->rsp_buf,
 793                         payload_length,
 794                         &login->rsp_length,
 795                         param->value);
 796         switch (authret) {
 797         case 0:
 798                 pr_debug("Received OK response"
 799                 " from LIO Authentication, continuing.\n");
 800                 break;
 801         case 1:
 802                 pr_debug("iSCSI security negotiation"
 803                         " completed successfully.\n");
 804                 login->auth_complete = 1;
 805                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 806                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 807                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 808                                              ISCSI_FLAG_LOGIN_TRANSIT);
 809                         login->current_stage = 1;
 810                 }
 811                 return iscsi_target_check_for_existing_instances(
 812                                 conn, login);
 813         case 2:
 814                 pr_err("Security negotiation"
 815                         " failed.\n");
 816                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 817                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 818                 return -1;
 819         default:
 820                 pr_err("Received unknown error %d from LIO"
 821                                 " Authentication\n", authret);
 822                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 823                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 824                 return -1;
 825         }
 826
 827         return 0;
 828 }
 829
 830 static int iscsi_target_handle_csg_zero(
 831         struct iscsi_conn *conn,
 832         struct iscsi_login *login)
 833 {
 834         int ret;
 835         u32 payload_length;
 836         struct iscsi_param *param;
 837         struct iscsi_login_req *login_req;
 838         struct iscsi_login_rsp *login_rsp;
 839
 840         login_req = (struct iscsi_login_req *) login->req;
 841         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 842         payload_length = ntoh24(login_req->dlength);
 843
 844         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 845         if (!param)
 846                 return -1;
 847
 848         ret = iscsi_decode_text_input(
 849                         PHASE_SECURITY|PHASE_DECLARATIVE,
 850                         SENDER_INITIATOR|SENDER_RECEIVER,
 851                         login->req_buf,
 852                         payload_length,
 853                         conn);
 854         if (ret < 0)
 855                 return -1;
 856
 857         if (ret > 0) {
 858                 if (login->auth_complete) {
 859                         pr_err("Initiator has already been"
 860                                 " successfully authenticated, but is still"
 861                                 " sending %s keys.\n", param->value);
 862                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 863                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 864                         return -1;
 865                 }
 866
 867                 goto do_auth;
 868         } else if (!payload_length) {
 869                 pr_err("Initiator sent zero length security payload,"
 870                        " login failed\n");
 871                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 872                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 873                 return -1;
 874         }
 875
 876         if (login->first_request)
 877                 if (iscsi_target_check_first_request(conn, login) < 0)
 878                         return -1;
 879
 880         ret = iscsi_encode_text_output(
 881                         PHASE_SECURITY|PHASE_DECLARATIVE,
 882                         SENDER_TARGET,
 883                         login->rsp_buf,
 884                         &login->rsp_length,
 885                         conn->param_list,
 886                         conn->tpg->tpg_attrib.login_keys_workaround);
 887         if (ret < 0)
 888                 return -1;
 889
 890         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 891                 if (conn->tpg->tpg_attrib.authentication &&
 892                     !strncmp(param->value, NONE, 4)) {
 893                         pr_err("Initiator sent AuthMethod=None but"
 894                                 " Target is enforcing iSCSI Authentication,"
 895                                         " login failed.\n");
 896                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 897                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 898                         return -1;
 899                 }
 900
 901                 if (conn->tpg->tpg_attrib.authentication &&
 902                     !login->auth_complete)
 903                         return 0;
 904
 905                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 906                         return 0;
 907
 908                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 909                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 910                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 911                                             ISCSI_FLAG_LOGIN_TRANSIT;
 912                         login->current_stage = 1;
 913                 }
 914         }
 915
 916         return 0;
 917 do_auth:
 918         return iscsi_target_do_authentication(conn, login);
 919 }
 920
 921 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 922 {
 923         int ret;
 924         u32 payload_length;
 925         struct iscsi_login_req *login_req;
 926         struct iscsi_login_rsp *login_rsp;
 927
 928         login_req = (struct iscsi_login_req *) login->req;
 929         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 930         payload_length = ntoh24(login_req->dlength);
 931
 932         ret = iscsi_decode_text_input(
 933                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 934                         SENDER_INITIATOR|SENDER_RECEIVER,
 935                         login->req_buf,
 936                         payload_length,
 937                         conn);
 938         if (ret < 0) {
 939                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 940                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 941                 return -1;
 942         }
 943
 944         if (login->first_request)
 945                 if (iscsi_target_check_first_request(conn, login) < 0)
 946                         return -1;
 947
 948         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 949                 return -1;
 950
 951         ret = iscsi_encode_text_output(
 952                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 953                         SENDER_TARGET,
 954                         login->rsp_buf,
 955                         &login->rsp_length,
 956                         conn->param_list,
 957                         conn->tpg->tpg_attrib.login_keys_workaround);
 958         if (ret < 0) {
 959                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 960                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 961                 return -1;
 962         }
 963
 964         if (!login->auth_complete &&
 965              conn->tpg->tpg_attrib.authentication) {
 966                 pr_err("Initiator is requesting CSG: 1, has not been"
 967                          " successfully authenticated, and the Target is"
 968                         " enforcing iSCSI Authentication, login failed.\n");
 969                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 970                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 971                 return -1;
 972         }
 973
 974         if (!iscsi_check_negotiated_keys(conn->param_list))
 975                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 976                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 977                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 978                                             ISCSI_FLAG_LOGIN_TRANSIT;
 979
 980         return 0;
 981 }
 982
 983 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 984 {
 985         int pdu_count = 0;
 986         struct iscsi_login_req *login_req;
 987         struct iscsi_login_rsp *login_rsp;
 988
 989         login_req = (struct iscsi_login_req *) login->req;
 990         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 991
 992         while (1) {
 993                 if (++pdu_count > MAX_LOGIN_PDUS) {
 994                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 995                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 996                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 997                         return -1;
 998                 }
 999
1000                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
1001                 case 0:
1002                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
1003                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
1004                                 return -1;
1005                         break;
1006                 case 1:
1007                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
1008                         if (iscsi_target_handle_csg_one(conn, login) < 0)
1009                                 return -1;
1010                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1011                                 /*
1012                                  * Check to make sure the TCP connection has not
1013                                  * dropped asynchronously while session reinstatement
1014                                  * was occuring in this kthread context, before
1015                                  * transitioning to full feature phase operation.
1016                                  */
1017                                 if (iscsi_target_sk_check_close(conn))
1018                                         return -1;
1019
1020                                 login->tsih = conn->sess->tsih;
1021                                 login->login_complete = 1;
1022                                 iscsi_target_restore_sock_callbacks(conn);
1023                                 if (iscsi_target_do_tx_login_io(conn,
1024                                                 login) < 0)
1025                                         return -1;
1026                                 return 1;
1027                         }
1028                         break;
1029                 default:
1030                         pr_err("Illegal CSG: %d received from"
1031                                 " Initiator, protocol error.\n",
1032                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
1033                         break;
1034                 }
1035
1036                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
1037                         return -1;
1038
1039                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
1040                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
1041                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
1042                 }
1043                 break;
1044         }
1045
1046         return 0;
1047 }
1048
1049 static void iscsi_initiatorname_tolower(
1050         char *param_buf)
1051 {
1052         char *c;
1053         u32 iqn_size = strlen(param_buf), i;
1054
1055         for (i = 0; i < iqn_size; i++) {
1056                 c = &param_buf[i];
1057                 if (!isupper(*c))
1058                         continue;
1059
1060                 *c = tolower(*c);
1061         }
1062 }
1063
1064 /*
1065  * Processes the first Login Request..
1066  */
1067 int iscsi_target_locate_portal(
1068         struct iscsi_np *np,
1069         struct iscsi_conn *conn,
1070         struct iscsi_login *login)
1071 {
1072         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
1073         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
1074         struct iscsi_session *sess = conn->sess;
1075         struct iscsi_tiqn *tiqn;
1076         struct iscsi_tpg_np *tpg_np = NULL;
1077         struct iscsi_login_req *login_req;
1078         struct se_node_acl *se_nacl;
1079         u32 payload_length, queue_depth = 0;
1080         int sessiontype = 0, ret = 0, tag_num, tag_size;
1081
1082         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
1083         INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
1084         iscsi_target_set_sock_callbacks(conn);
1085
1086         login->np = np;
1087
1088         login_req = (struct iscsi_login_req *) login->req;
1089         payload_length = ntoh24(login_req->dlength);
1090
1091         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
1092         if (!tmpbuf) {
1093                 pr_err("Unable to allocate memory for tmpbuf.\n");
1094                 return -1;
1095         }
1096
1097         memcpy(tmpbuf, login->req_buf, payload_length);
1098         tmpbuf[payload_length] = '\0';
1099         start = tmpbuf;
1100         end = (start + payload_length);
1101
1102         /*
1103          * Locate the initial keys expected from the Initiator node in
1104          * the first login request in order to progress with the login phase.
1105          */
1106         while (start < end) {
1107                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1108                         ret = -1;
1109                         goto out;
1110                 }
1111
1112                 if (!strncmp(key, "InitiatorName", 13))
1113                         i_buf = value;
1114                 else if (!strncmp(key, "SessionType", 11))
1115                         s_buf = value;
1116                 else if (!strncmp(key, "TargetName", 10))
1117                         t_buf = value;
1118
1119                 start += strlen(key) + strlen(value) + 2;
1120         }
1121         /*
1122          * See 5.3.  Login Phase.
1123          */
1124         if (!i_buf) {
1125                 pr_err("InitiatorName key not received"
1126                         " in first login request.\n");
1127                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1128                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1129                 ret = -1;
1130                 goto out;
1131         }
1132         /*
1133          * Convert the incoming InitiatorName to lowercase following
1134          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1135          * are NOT case sensitive.
1136          */
1137         iscsi_initiatorname_tolower(i_buf);
1138
1139         if (!s_buf) {
1140                 if (!login->leading_connection)
1141                         goto get_target;
1142
1143                 pr_err("SessionType key not received"
1144                         " in first login request.\n");
1145                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1146                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1147                 ret = -1;
1148                 goto out;
1149         }
1150
1151         /*
1152          * Use default portal group for discovery sessions.
1153          */
1154         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1155         if (!sessiontype) {
1156                 conn->tpg = iscsit_global->discovery_tpg;
1157                 if (!login->leading_connection)
1158                         goto get_target;
1159
1160                 sess->sess_ops->SessionType = 1;
1161                 /*
1162                  * Setup crc32c modules from libcrypto
1163                  */
1164                 if (iscsi_login_setup_crypto(conn) < 0) {
1165                         pr_err("iscsi_login_setup_crypto() failed\n");
1166                         ret = -1;
1167                         goto out;
1168                 }
1169                 /*
1170                  * Serialize access across the discovery struct iscsi_portal_group to
1171                  * process login attempt.
1172                  */
1173                 if (iscsit_access_np(np, conn->tpg) < 0) {
1174                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1175                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1176                         ret = -1;
1177                         goto out;
1178                 }
1179                 ret = 0;
1180                 goto alloc_tags;
1181         }
1182
1183 get_target:
1184         if (!t_buf) {
1185                 pr_err("TargetName key not received"
1186                         " in first login request while"
1187                         " SessionType=Normal.\n");
1188                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1189                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1190                 ret = -1;
1191                 goto out;
1192         }
1193
1194         /*
1195          * Locate Target IQN from Storage Node.
1196          */
1197         tiqn = iscsit_get_tiqn_for_login(t_buf);
1198         if (!tiqn) {
1199                 pr_err("Unable to locate Target IQN: %s in"
1200                         " Storage Node\n", t_buf);
1201                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1202                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1203                 ret = -1;
1204                 goto out;
1205         }
1206         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1207
1208         /*
1209          * Locate Target Portal Group from Storage Node.
1210          */
1211         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1212         if (!conn->tpg) {
1213                 pr_err("Unable to locate Target Portal Group"
1214                                 " on %s\n", tiqn->tiqn);
1215                 iscsit_put_tiqn_for_login(tiqn);
1216                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1217                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1218                 ret = -1;
1219                 goto out;
1220         }
1221         conn->tpg_np = tpg_np;
1222         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1223         /*
1224          * Setup crc32c modules from libcrypto
1225          */
1226         if (iscsi_login_setup_crypto(conn) < 0) {
1227                 pr_err("iscsi_login_setup_crypto() failed\n");
1228                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1229                 iscsit_put_tiqn_for_login(tiqn);
1230                 conn->tpg = NULL;
1231                 ret = -1;
1232                 goto out;
1233         }
1234         /*
1235          * Serialize access across the struct iscsi_portal_group to
1236          * process login attempt.
1237          */
1238         if (iscsit_access_np(np, conn->tpg) < 0) {
1239                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1240                 iscsit_put_tiqn_for_login(tiqn);
1241                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1242                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1243                 conn->tpg = NULL;
1244                 ret = -1;
1245                 goto out;
1246         }
1247
1248         /*
1249          * conn->sess->node_acl will be set when the referenced
1250          * struct iscsi_session is located from received ISID+TSIH in
1251          * iscsi_login_non_zero_tsih_s2().
1252          */
1253         if (!login->leading_connection) {
1254                 ret = 0;
1255                 goto out;
1256         }
1257
1258         /*
1259          * This value is required in iscsi_login_zero_tsih_s2()
1260          */
1261         sess->sess_ops->SessionType = 0;
1262
1263         /*
1264          * Locate incoming Initiator IQN reference from Storage Node.
1265          */
1266         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1267                         &conn->tpg->tpg_se_tpg, i_buf);
1268         if (!sess->se_sess->se_node_acl) {
1269                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1270                         " access iSCSI target portal group: %hu.\n",
1271                                 i_buf, conn->tpg->tpgt);
1272                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1273                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1274                 ret = -1;
1275                 goto out;
1276         }
1277         se_nacl = sess->se_sess->se_node_acl;
1278         queue_depth = se_nacl->queue_depth;
1279         /*
1280          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1281          * depth for non immediate commands, plus extra tags for immediate
1282          * commands.
1283          *
1284          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1285          * in per-cpu-ida tag allocation logic + small queue_depth.
1286          */
1287 alloc_tags:
1288         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1289         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1290         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1291
1292         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1293         if (ret < 0) {
1294                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1295                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1296                 ret = -1;
1297         }
1298 out:
1299         kfree(tmpbuf);
1300         return ret;
1301 }
1302
1303 int iscsi_target_start_negotiation(
1304         struct iscsi_login *login,
1305         struct iscsi_conn *conn)
1306 {
1307         int ret;
1308
1309        if (conn->sock) {
1310                struct sock *sk = conn->sock->sk;
1311
1312                 write_lock_bh(&sk->sk_callback_lock);
1313                 set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1314                 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags);
1315                 write_unlock_bh(&sk->sk_callback_lock);
1316         }
1317         /*
1318          * If iscsi_target_do_login returns zero to signal more PDU
1319          * exchanges are required to complete the login, go ahead and
1320          * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection
1321          * is still active.
1322          *
1323          * Otherwise if TCP connection dropped asynchronously, go ahead
1324          * and perform connection cleanup now.
1325          */
1326         ret = iscsi_target_do_login(conn, login);
1327         if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU))
1328                 ret = -1;
1329
1330         if (ret < 0) {
1331                 cancel_delayed_work_sync(&conn->login_work);
1332                 cancel_delayed_work_sync(&conn->login_cleanup_work);
1333                 iscsi_target_restore_sock_callbacks(conn);
1334                 iscsi_remove_failed_auth_entry(conn);
1335         }
1336         if (ret != 0)
1337                 iscsi_target_nego_release(conn);
1338
1339         return ret;
1340 }
1341
1342 void iscsi_target_nego_release(struct iscsi_conn *conn)
1343 {
1344         struct iscsi_login *login = conn->conn_login;
1345
1346         if (!login)
1347                 return;
1348
1349         kfree(login->req_buf);
1350         kfree(login->rsp_buf);
1351         kfree(login);
1352
1353         conn->conn_login = NULL;
1354 }