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