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