drivers/target/iscsi/iscsi_target_nego.c

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