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 <target/iscsi/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_login_rsp *login_rsp;
 344
 345         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 346
 347         login_rsp->opcode               = ISCSI_OP_LOGIN_RSP;
 348         hton24(login_rsp->dlength, login->rsp_length);
 349         memcpy(login_rsp->isid, login->isid, 6);
 350         login_rsp->tsih                 = cpu_to_be16(login->tsih);
 351         login_rsp->itt                  = login->init_task_tag;
 352         login_rsp->statsn               = cpu_to_be32(conn->stat_sn++);
 353         login_rsp->exp_cmdsn            = cpu_to_be32(conn->sess->exp_cmd_sn);
 354         login_rsp->max_cmdsn            = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
 355
 356         pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x,"
 357                 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:"
 358                 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt,
 359                 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn),
 360                 ntohl(login_rsp->statsn), login->rsp_length);
 361
 362         padding = ((-login->rsp_length) & 3);
 363
 364         if (conn->conn_transport->iscsit_put_login_tx(conn, login,
 365                                         login->rsp_length + padding) < 0)
 366                 return -1;
 367
 368         login->rsp_length               = 0;
 369
 370         return 0;
 371 }
 372
 373 static void iscsi_target_sk_data_ready(struct sock *sk)
 374 {
 375         struct iscsi_conn *conn = sk->sk_user_data;
 376         bool rc;
 377
 378         pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn);
 379
 380         write_lock_bh(&sk->sk_callback_lock);
 381         if (!sk->sk_user_data) {
 382                 write_unlock_bh(&sk->sk_callback_lock);
 383                 return;
 384         }
 385         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 386                 write_unlock_bh(&sk->sk_callback_lock);
 387                 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn);
 388                 return;
 389         }
 390         if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 391                 write_unlock_bh(&sk->sk_callback_lock);
 392                 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn);
 393                 return;
 394         }
 395         if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 396                 write_unlock_bh(&sk->sk_callback_lock);
 397                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
 398                 return;
 399         }
 400
 401         rc = schedule_delayed_work(&conn->login_work, 0);
 402         if (!rc) {
 403                 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work"
 404                          " got false\n");
 405         }
 406         write_unlock_bh(&sk->sk_callback_lock);
 407 }
 408
 409 static void iscsi_target_sk_state_change(struct sock *);
 410
 411 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn)
 412 {
 413         struct sock *sk;
 414
 415         if (!conn->sock)
 416                 return;
 417
 418         sk = conn->sock->sk;
 419         pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn);
 420
 421         write_lock_bh(&sk->sk_callback_lock);
 422         sk->sk_user_data = conn;
 423         conn->orig_data_ready = sk->sk_data_ready;
 424         conn->orig_state_change = sk->sk_state_change;
 425         sk->sk_data_ready = iscsi_target_sk_data_ready;
 426         sk->sk_state_change = iscsi_target_sk_state_change;
 427         write_unlock_bh(&sk->sk_callback_lock);
 428
 429         sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ;
 430         sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ;
 431 }
 432
 433 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn)
 434 {
 435         struct sock *sk;
 436
 437         if (!conn->sock)
 438                 return;
 439
 440         sk = conn->sock->sk;
 441         pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn);
 442
 443         write_lock_bh(&sk->sk_callback_lock);
 444         if (!sk->sk_user_data) {
 445                 write_unlock_bh(&sk->sk_callback_lock);
 446                 return;
 447         }
 448         sk->sk_user_data = NULL;
 449         sk->sk_data_ready = conn->orig_data_ready;
 450         sk->sk_state_change = conn->orig_state_change;
 451         write_unlock_bh(&sk->sk_callback_lock);
 452
 453         sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
 454         sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
 455 }
 456
 457 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *);
 458
 459 static bool iscsi_target_sk_state_check(struct sock *sk)
 460 {
 461         if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) {
 462                 pr_debug("iscsi_target_sk_state_check: TCP_CLOSE_WAIT|TCP_CLOSE,"
 463                         "returning FALSE\n");
 464                 return false;
 465         }
 466         return true;
 467 }
 468
 469 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login)
 470 {
 471         struct iscsi_np *np = login->np;
 472         bool zero_tsih = login->zero_tsih;
 473
 474         iscsi_remove_failed_auth_entry(conn);
 475         iscsi_target_nego_release(conn);
 476         iscsi_target_login_sess_out(conn, np, zero_tsih, true);
 477 }
 478
 479 static void iscsi_target_login_timeout(unsigned long data)
 480 {
 481         struct iscsi_conn *conn = (struct iscsi_conn *)data;
 482
 483         pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
 484
 485         if (conn->login_kworker) {
 486                 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
 487                          conn->login_kworker->comm, conn->login_kworker->pid);
 488                 send_sig(SIGINT, conn->login_kworker, 1);
 489         }
 490 }
 491
 492 static void iscsi_target_do_login_rx(struct work_struct *work)
 493 {
 494         struct iscsi_conn *conn = container_of(work,
 495                                 struct iscsi_conn, login_work.work);
 496         struct iscsi_login *login = conn->login;
 497         struct iscsi_np *np = login->np;
 498         struct iscsi_portal_group *tpg = conn->tpg;
 499         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 500         struct timer_list login_timer;
 501         int rc, zero_tsih = login->zero_tsih;
 502         bool state;
 503
 504         pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n",
 505                         conn, current->comm, current->pid);
 506
 507         spin_lock(&tpg->tpg_state_lock);
 508         state = (tpg->tpg_state == TPG_STATE_ACTIVE);
 509         spin_unlock(&tpg->tpg_state_lock);
 510
 511         if (!state) {
 512                 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n");
 513                 iscsi_target_restore_sock_callbacks(conn);
 514                 iscsi_target_login_drop(conn, login);
 515                 iscsit_deaccess_np(np, tpg, tpg_np);
 516                 return;
 517         }
 518
 519         if (conn->sock) {
 520                 struct sock *sk = conn->sock->sk;
 521
 522                 read_lock_bh(&sk->sk_callback_lock);
 523                 state = iscsi_target_sk_state_check(sk);
 524                 read_unlock_bh(&sk->sk_callback_lock);
 525
 526                 if (!state) {
 527                         pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n");
 528                         iscsi_target_restore_sock_callbacks(conn);
 529                         iscsi_target_login_drop(conn, login);
 530                         iscsit_deaccess_np(np, tpg, tpg_np);
 531                         return;
 532                 }
 533         }
 534
 535         conn->login_kworker = current;
 536         allow_signal(SIGINT);
 537
 538         init_timer(&login_timer);
 539         login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
 540         login_timer.data = (unsigned long)conn;
 541         login_timer.function = iscsi_target_login_timeout;
 542         add_timer(&login_timer);
 543         pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid);
 544
 545         rc = conn->conn_transport->iscsit_get_login_rx(conn, login);
 546         del_timer_sync(&login_timer);
 547         flush_signals(current);
 548         conn->login_kworker = NULL;
 549
 550         if (rc < 0) {
 551                 iscsi_target_restore_sock_callbacks(conn);
 552                 iscsi_target_login_drop(conn, login);
 553                 iscsit_deaccess_np(np, tpg, tpg_np);
 554                 return;
 555         }
 556
 557         pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n",
 558                         conn, current->comm, current->pid);
 559
 560         rc = iscsi_target_do_login(conn, login);
 561         if (rc < 0) {
 562                 iscsi_target_restore_sock_callbacks(conn);
 563                 iscsi_target_login_drop(conn, login);
 564                 iscsit_deaccess_np(np, tpg, tpg_np);
 565         } else if (!rc) {
 566                 if (conn->sock) {
 567                         struct sock *sk = conn->sock->sk;
 568
 569                         write_lock_bh(&sk->sk_callback_lock);
 570                         clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags);
 571                         write_unlock_bh(&sk->sk_callback_lock);
 572                 }
 573         } else if (rc == 1) {
 574                 iscsi_target_nego_release(conn);
 575                 iscsi_post_login_handler(np, conn, zero_tsih);
 576                 iscsit_deaccess_np(np, tpg, tpg_np);
 577         }
 578 }
 579
 580 static void iscsi_target_do_cleanup(struct work_struct *work)
 581 {
 582         struct iscsi_conn *conn = container_of(work,
 583                                 struct iscsi_conn, login_cleanup_work.work);
 584         struct sock *sk = conn->sock->sk;
 585         struct iscsi_login *login = conn->login;
 586         struct iscsi_np *np = login->np;
 587         struct iscsi_portal_group *tpg = conn->tpg;
 588         struct iscsi_tpg_np *tpg_np = conn->tpg_np;
 589
 590         pr_debug("Entering iscsi_target_do_cleanup\n");
 591
 592         cancel_delayed_work_sync(&conn->login_work);
 593         conn->orig_state_change(sk);
 594
 595         iscsi_target_restore_sock_callbacks(conn);
 596         iscsi_target_login_drop(conn, login);
 597         iscsit_deaccess_np(np, tpg, tpg_np);
 598
 599         pr_debug("iscsi_target_do_cleanup done()\n");
 600 }
 601
 602 static void iscsi_target_sk_state_change(struct sock *sk)
 603 {
 604         struct iscsi_conn *conn;
 605         void (*orig_state_change)(struct sock *);
 606         bool state;
 607
 608         pr_debug("Entering iscsi_target_sk_state_change\n");
 609
 610         write_lock_bh(&sk->sk_callback_lock);
 611         conn = sk->sk_user_data;
 612         if (!conn) {
 613                 write_unlock_bh(&sk->sk_callback_lock);
 614                 return;
 615         }
 616         orig_state_change = conn->orig_state_change;
 617
 618         if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) {
 619                 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n",
 620                          conn);
 621                 write_unlock_bh(&sk->sk_callback_lock);
 622                 orig_state_change(sk);
 623                 return;
 624         }
 625         if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 626                 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change"
 627                          " conn: %p\n", conn);
 628                 write_unlock_bh(&sk->sk_callback_lock);
 629                 orig_state_change(sk);
 630                 return;
 631         }
 632         if (test_and_set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) {
 633                 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n",
 634                          conn);
 635                 write_unlock_bh(&sk->sk_callback_lock);
 636                 orig_state_change(sk);
 637                 return;
 638         }
 639
 640         state = iscsi_target_sk_state_check(sk);
 641         write_unlock_bh(&sk->sk_callback_lock);
 642
 643         pr_debug("iscsi_target_sk_state_change: state: %d\n", state);
 644
 645         if (!state) {
 646                 pr_debug("iscsi_target_sk_state_change got failed state\n");
 647                 schedule_delayed_work(&conn->login_cleanup_work, 0);
 648                 return;
 649         }
 650         orig_state_change(sk);
 651 }
 652
 653 /*
 654  *      NOTE: We check for existing sessions or connections AFTER the initiator
 655  *      has been successfully authenticated in order to protect against faked
 656  *      ISID/TSIH combinations.
 657  */
 658 static int iscsi_target_check_for_existing_instances(
 659         struct iscsi_conn *conn,
 660         struct iscsi_login *login)
 661 {
 662         if (login->checked_for_existing)
 663                 return 0;
 664
 665         login->checked_for_existing = 1;
 666
 667         if (!login->tsih)
 668                 return iscsi_check_for_session_reinstatement(conn);
 669         else
 670                 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid,
 671                                 login->initial_exp_statsn);
 672 }
 673
 674 static int iscsi_target_do_authentication(
 675         struct iscsi_conn *conn,
 676         struct iscsi_login *login)
 677 {
 678         int authret;
 679         u32 payload_length;
 680         struct iscsi_param *param;
 681         struct iscsi_login_req *login_req;
 682         struct iscsi_login_rsp *login_rsp;
 683
 684         login_req = (struct iscsi_login_req *) login->req;
 685         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 686         payload_length = ntoh24(login_req->dlength);
 687
 688         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 689         if (!param)
 690                 return -1;
 691
 692         authret = iscsi_handle_authentication(
 693                         conn,
 694                         login->req_buf,
 695                         login->rsp_buf,
 696                         payload_length,
 697                         &login->rsp_length,
 698                         param->value);
 699         switch (authret) {
 700         case 0:
 701                 pr_debug("Received OK response"
 702                 " from LIO Authentication, continuing.\n");
 703                 break;
 704         case 1:
 705                 pr_debug("iSCSI security negotiation"
 706                         " completed successfully.\n");
 707                 login->auth_complete = 1;
 708                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 709                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 710                         login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 711                                              ISCSI_FLAG_LOGIN_TRANSIT);
 712                         login->current_stage = 1;
 713                 }
 714                 return iscsi_target_check_for_existing_instances(
 715                                 conn, login);
 716         case 2:
 717                 pr_err("Security negotiation"
 718                         " failed.\n");
 719                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 720                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 721                 return -1;
 722         default:
 723                 pr_err("Received unknown error %d from LIO"
 724                                 " Authentication\n", authret);
 725                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 726                                 ISCSI_LOGIN_STATUS_TARGET_ERROR);
 727                 return -1;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static int iscsi_target_handle_csg_zero(
 734         struct iscsi_conn *conn,
 735         struct iscsi_login *login)
 736 {
 737         int ret;
 738         u32 payload_length;
 739         struct iscsi_param *param;
 740         struct iscsi_login_req *login_req;
 741         struct iscsi_login_rsp *login_rsp;
 742
 743         login_req = (struct iscsi_login_req *) login->req;
 744         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 745         payload_length = ntoh24(login_req->dlength);
 746
 747         param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
 748         if (!param)
 749                 return -1;
 750
 751         ret = iscsi_decode_text_input(
 752                         PHASE_SECURITY|PHASE_DECLARATIVE,
 753                         SENDER_INITIATOR|SENDER_RECEIVER,
 754                         login->req_buf,
 755                         payload_length,
 756                         conn);
 757         if (ret < 0)
 758                 return -1;
 759
 760         if (ret > 0) {
 761                 if (login->auth_complete) {
 762                         pr_err("Initiator has already been"
 763                                 " successfully authenticated, but is still"
 764                                 " sending %s keys.\n", param->value);
 765                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 766                                         ISCSI_LOGIN_STATUS_INIT_ERR);
 767                         return -1;
 768                 }
 769
 770                 goto do_auth;
 771         } else if (!payload_length) {
 772                 pr_err("Initiator sent zero length security payload,"
 773                        " login failed\n");
 774                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 775                                     ISCSI_LOGIN_STATUS_AUTH_FAILED);
 776                 return -1;
 777         }
 778
 779         if (login->first_request)
 780                 if (iscsi_target_check_first_request(conn, login) < 0)
 781                         return -1;
 782
 783         ret = iscsi_encode_text_output(
 784                         PHASE_SECURITY|PHASE_DECLARATIVE,
 785                         SENDER_TARGET,
 786                         login->rsp_buf,
 787                         &login->rsp_length,
 788                         conn->param_list);
 789         if (ret < 0)
 790                 return -1;
 791
 792         if (!iscsi_check_negotiated_keys(conn->param_list)) {
 793                 if (conn->tpg->tpg_attrib.authentication &&
 794                     !strncmp(param->value, NONE, 4)) {
 795                         pr_err("Initiator sent AuthMethod=None but"
 796                                 " Target is enforcing iSCSI Authentication,"
 797                                         " login failed.\n");
 798                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 799                                         ISCSI_LOGIN_STATUS_AUTH_FAILED);
 800                         return -1;
 801                 }
 802
 803                 if (conn->tpg->tpg_attrib.authentication &&
 804                     !login->auth_complete)
 805                         return 0;
 806
 807                 if (strncmp(param->value, NONE, 4) && !login->auth_complete)
 808                         return 0;
 809
 810                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) &&
 811                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) {
 812                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 |
 813                                             ISCSI_FLAG_LOGIN_TRANSIT;
 814                         login->current_stage = 1;
 815                 }
 816         }
 817
 818         return 0;
 819 do_auth:
 820         return iscsi_target_do_authentication(conn, login);
 821 }
 822
 823 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login)
 824 {
 825         int ret;
 826         u32 payload_length;
 827         struct iscsi_login_req *login_req;
 828         struct iscsi_login_rsp *login_rsp;
 829
 830         login_req = (struct iscsi_login_req *) login->req;
 831         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 832         payload_length = ntoh24(login_req->dlength);
 833
 834         ret = iscsi_decode_text_input(
 835                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 836                         SENDER_INITIATOR|SENDER_RECEIVER,
 837                         login->req_buf,
 838                         payload_length,
 839                         conn);
 840         if (ret < 0) {
 841                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 842                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 843                 return -1;
 844         }
 845
 846         if (login->first_request)
 847                 if (iscsi_target_check_first_request(conn, login) < 0)
 848                         return -1;
 849
 850         if (iscsi_target_check_for_existing_instances(conn, login) < 0)
 851                 return -1;
 852
 853         ret = iscsi_encode_text_output(
 854                         PHASE_OPERATIONAL|PHASE_DECLARATIVE,
 855                         SENDER_TARGET,
 856                         login->rsp_buf,
 857                         &login->rsp_length,
 858                         conn->param_list);
 859         if (ret < 0) {
 860                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 861                                 ISCSI_LOGIN_STATUS_INIT_ERR);
 862                 return -1;
 863         }
 864
 865         if (!login->auth_complete &&
 866              conn->tpg->tpg_attrib.authentication) {
 867                 pr_err("Initiator is requesting CSG: 1, has not been"
 868                          " successfully authenticated, and the Target is"
 869                         " enforcing iSCSI Authentication, login failed.\n");
 870                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
 871                                 ISCSI_LOGIN_STATUS_AUTH_FAILED);
 872                 return -1;
 873         }
 874
 875         if (!iscsi_check_negotiated_keys(conn->param_list))
 876                 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) &&
 877                     (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT))
 878                         login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 |
 879                                             ISCSI_FLAG_LOGIN_TRANSIT;
 880
 881         return 0;
 882 }
 883
 884 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login)
 885 {
 886         int pdu_count = 0;
 887         struct iscsi_login_req *login_req;
 888         struct iscsi_login_rsp *login_rsp;
 889
 890         login_req = (struct iscsi_login_req *) login->req;
 891         login_rsp = (struct iscsi_login_rsp *) login->rsp;
 892
 893         while (1) {
 894                 if (++pdu_count > MAX_LOGIN_PDUS) {
 895                         pr_err("MAX_LOGIN_PDUS count reached.\n");
 896                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
 897                                         ISCSI_LOGIN_STATUS_TARGET_ERROR);
 898                         return -1;
 899                 }
 900
 901                 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) {
 902                 case 0:
 903                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK;
 904                         if (iscsi_target_handle_csg_zero(conn, login) < 0)
 905                                 return -1;
 906                         break;
 907                 case 1:
 908                         login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1;
 909                         if (iscsi_target_handle_csg_one(conn, login) < 0)
 910                                 return -1;
 911                         if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 912                                 login->tsih = conn->sess->tsih;
 913                                 login->login_complete = 1;
 914                                 iscsi_target_restore_sock_callbacks(conn);
 915                                 if (iscsi_target_do_tx_login_io(conn,
 916                                                 login) < 0)
 917                                         return -1;
 918                                 return 1;
 919                         }
 920                         break;
 921                 default:
 922                         pr_err("Illegal CSG: %d received from"
 923                                 " Initiator, protocol error.\n",
 924                                 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags));
 925                         break;
 926                 }
 927
 928                 if (iscsi_target_do_tx_login_io(conn, login) < 0)
 929                         return -1;
 930
 931                 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) {
 932                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT;
 933                         login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK;
 934                 }
 935                 break;
 936         }
 937
 938         if (conn->sock) {
 939                 struct sock *sk = conn->sock->sk;
 940                 bool state;
 941
 942                 read_lock_bh(&sk->sk_callback_lock);
 943                 state = iscsi_target_sk_state_check(sk);
 944                 read_unlock_bh(&sk->sk_callback_lock);
 945
 946                 if (!state) {
 947                         pr_debug("iscsi_target_do_login() failed state for"
 948                                  " conn: %p\n", conn);
 949                         return -1;
 950                 }
 951         }
 952
 953         return 0;
 954 }
 955
 956 static void iscsi_initiatorname_tolower(
 957         char *param_buf)
 958 {
 959         char *c;
 960         u32 iqn_size = strlen(param_buf), i;
 961
 962         for (i = 0; i < iqn_size; i++) {
 963                 c = &param_buf[i];
 964                 if (!isupper(*c))
 965                         continue;
 966
 967                 *c = tolower(*c);
 968         }
 969 }
 970
 971 /*
 972  * Processes the first Login Request..
 973  */
 974 int iscsi_target_locate_portal(
 975         struct iscsi_np *np,
 976         struct iscsi_conn *conn,
 977         struct iscsi_login *login)
 978 {
 979         char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL;
 980         char *tmpbuf, *start = NULL, *end = NULL, *key, *value;
 981         struct iscsi_session *sess = conn->sess;
 982         struct iscsi_tiqn *tiqn;
 983         struct iscsi_tpg_np *tpg_np = NULL;
 984         struct iscsi_login_req *login_req;
 985         struct se_node_acl *se_nacl;
 986         u32 payload_length, queue_depth = 0;
 987         int sessiontype = 0, ret = 0, tag_num, tag_size;
 988
 989         INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx);
 990         INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup);
 991         iscsi_target_set_sock_callbacks(conn);
 992
 993         login->np = np;
 994
 995         login_req = (struct iscsi_login_req *) login->req;
 996         payload_length = ntoh24(login_req->dlength);
 997
 998         tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL);
 999         if (!tmpbuf) {
1000                 pr_err("Unable to allocate memory for tmpbuf.\n");
1001                 return -1;
1002         }
1003
1004         memcpy(tmpbuf, login->req_buf, payload_length);
1005         tmpbuf[payload_length] = '\0';
1006         start = tmpbuf;
1007         end = (start + payload_length);
1008
1009         /*
1010          * Locate the initial keys expected from the Initiator node in
1011          * the first login request in order to progress with the login phase.
1012          */
1013         while (start < end) {
1014                 if (iscsi_extract_key_value(start, &key, &value) < 0) {
1015                         ret = -1;
1016                         goto out;
1017                 }
1018
1019                 if (!strncmp(key, "InitiatorName", 13))
1020                         i_buf = value;
1021                 else if (!strncmp(key, "SessionType", 11))
1022                         s_buf = value;
1023                 else if (!strncmp(key, "TargetName", 10))
1024                         t_buf = value;
1025
1026                 start += strlen(key) + strlen(value) + 2;
1027         }
1028         /*
1029          * See 5.3.  Login Phase.
1030          */
1031         if (!i_buf) {
1032                 pr_err("InitiatorName key not received"
1033                         " in first login request.\n");
1034                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1035                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1036                 ret = -1;
1037                 goto out;
1038         }
1039         /*
1040          * Convert the incoming InitiatorName to lowercase following
1041          * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs
1042          * are NOT case sensitive.
1043          */
1044         iscsi_initiatorname_tolower(i_buf);
1045
1046         if (!s_buf) {
1047                 if (!login->leading_connection)
1048                         goto get_target;
1049
1050                 pr_err("SessionType key not received"
1051                         " in first login request.\n");
1052                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1053                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1054                 ret = -1;
1055                 goto out;
1056         }
1057
1058         /*
1059          * Use default portal group for discovery sessions.
1060          */
1061         sessiontype = strncmp(s_buf, DISCOVERY, 9);
1062         if (!sessiontype) {
1063                 conn->tpg = iscsit_global->discovery_tpg;
1064                 if (!login->leading_connection)
1065                         goto get_target;
1066
1067                 sess->sess_ops->SessionType = 1;
1068                 /*
1069                  * Setup crc32c modules from libcrypto
1070                  */
1071                 if (iscsi_login_setup_crypto(conn) < 0) {
1072                         pr_err("iscsi_login_setup_crypto() failed\n");
1073                         ret = -1;
1074                         goto out;
1075                 }
1076                 /*
1077                  * Serialize access across the discovery struct iscsi_portal_group to
1078                  * process login attempt.
1079                  */
1080                 if (iscsit_access_np(np, conn->tpg) < 0) {
1081                         iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1082                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1083                         ret = -1;
1084                         goto out;
1085                 }
1086                 ret = 0;
1087                 goto alloc_tags;
1088         }
1089
1090 get_target:
1091         if (!t_buf) {
1092                 pr_err("TargetName key not received"
1093                         " in first login request while"
1094                         " SessionType=Normal.\n");
1095                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1096                         ISCSI_LOGIN_STATUS_MISSING_FIELDS);
1097                 ret = -1;
1098                 goto out;
1099         }
1100
1101         /*
1102          * Locate Target IQN from Storage Node.
1103          */
1104         tiqn = iscsit_get_tiqn_for_login(t_buf);
1105         if (!tiqn) {
1106                 pr_err("Unable to locate Target IQN: %s in"
1107                         " Storage Node\n", t_buf);
1108                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1109                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1110                 ret = -1;
1111                 goto out;
1112         }
1113         pr_debug("Located Storage Object: %s\n", tiqn->tiqn);
1114
1115         /*
1116          * Locate Target Portal Group from Storage Node.
1117          */
1118         conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np);
1119         if (!conn->tpg) {
1120                 pr_err("Unable to locate Target Portal Group"
1121                                 " on %s\n", tiqn->tiqn);
1122                 iscsit_put_tiqn_for_login(tiqn);
1123                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1124                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1125                 ret = -1;
1126                 goto out;
1127         }
1128         conn->tpg_np = tpg_np;
1129         pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt);
1130         /*
1131          * Setup crc32c modules from libcrypto
1132          */
1133         if (iscsi_login_setup_crypto(conn) < 0) {
1134                 pr_err("iscsi_login_setup_crypto() failed\n");
1135                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1136                 iscsit_put_tiqn_for_login(tiqn);
1137                 conn->tpg = NULL;
1138                 ret = -1;
1139                 goto out;
1140         }
1141         /*
1142          * Serialize access across the struct iscsi_portal_group to
1143          * process login attempt.
1144          */
1145         if (iscsit_access_np(np, conn->tpg) < 0) {
1146                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
1147                 iscsit_put_tiqn_for_login(tiqn);
1148                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1149                                 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1150                 conn->tpg = NULL;
1151                 ret = -1;
1152                 goto out;
1153         }
1154
1155         /*
1156          * conn->sess->node_acl will be set when the referenced
1157          * struct iscsi_session is located from received ISID+TSIH in
1158          * iscsi_login_non_zero_tsih_s2().
1159          */
1160         if (!login->leading_connection) {
1161                 ret = 0;
1162                 goto out;
1163         }
1164
1165         /*
1166          * This value is required in iscsi_login_zero_tsih_s2()
1167          */
1168         sess->sess_ops->SessionType = 0;
1169
1170         /*
1171          * Locate incoming Initiator IQN reference from Storage Node.
1172          */
1173         sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1174                         &conn->tpg->tpg_se_tpg, i_buf);
1175         if (!sess->se_sess->se_node_acl) {
1176                 pr_err("iSCSI Initiator Node: %s is not authorized to"
1177                         " access iSCSI target portal group: %hu.\n",
1178                                 i_buf, conn->tpg->tpgt);
1179                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1180                                 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN);
1181                 ret = -1;
1182                 goto out;
1183         }
1184         se_nacl = sess->se_sess->se_node_acl;
1185         queue_depth = se_nacl->queue_depth;
1186         /*
1187          * Setup pre-allocated tags based upon allowed per NodeACL CmdSN
1188          * depth for non immediate commands, plus extra tags for immediate
1189          * commands.
1190          *
1191          * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention
1192          * in per-cpu-ida tag allocation logic + small queue_depth.
1193          */
1194 alloc_tags:
1195         tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth);
1196         tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS;
1197         tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
1198
1199         ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size);
1200         if (ret < 0) {
1201                 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1202                                     ISCSI_LOGIN_STATUS_NO_RESOURCES);
1203                 ret = -1;
1204         }
1205 out:
1206         kfree(tmpbuf);
1207         return ret;
1208 }
1209
1210 int iscsi_target_start_negotiation(
1211         struct iscsi_login *login,
1212         struct iscsi_conn *conn)
1213 {
1214         int ret;
1215
1216         ret = iscsi_target_do_login(conn, login);
1217         if (!ret) {
1218                 if (conn->sock) {
1219                         struct sock *sk = conn->sock->sk;
1220
1221                         write_lock_bh(&sk->sk_callback_lock);
1222                         set_bit(LOGIN_FLAGS_READY, &conn->login_flags);
1223                         write_unlock_bh(&sk->sk_callback_lock);
1224                 }
1225         } else if (ret < 0) {
1226                 cancel_delayed_work_sync(&conn->login_work);
1227                 cancel_delayed_work_sync(&conn->login_cleanup_work);
1228                 iscsi_target_restore_sock_callbacks(conn);
1229                 iscsi_remove_failed_auth_entry(conn);
1230         }
1231         if (ret != 0)
1232                 iscsi_target_nego_release(conn);
1233
1234         return ret;
1235 }
1236
1237 void iscsi_target_nego_release(struct iscsi_conn *conn)
1238 {
1239         struct iscsi_login *login = conn->conn_login;
1240
1241         if (!login)
1242                 return;
1243
1244         kfree(login->req_buf);
1245         kfree(login->rsp_buf);
1246         kfree(login);
1247
1248         conn->conn_login = NULL;
1249 }