1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * This file contains main functions related to iSCSI Parameter negotiation. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 6 * 7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ******************************************************************************/ 10 11 #include <linux/ctype.h> 12 #include <linux/kthread.h> 13 #include <linux/slab.h> 14 #include <linux/sched/signal.h> 15 #include <net/sock.h> 16 #include <scsi/iscsi_proto.h> 17 #include <target/target_core_base.h> 18 #include <target/target_core_fabric.h> 19 #include <target/iscsi/iscsi_transport.h> 20 21 #include <target/iscsi/iscsi_target_core.h> 22 #include "iscsi_target_parameters.h" 23 #include "iscsi_target_login.h" 24 #include "iscsi_target_nego.h" 25 #include "iscsi_target_tpg.h" 26 #include "iscsi_target_util.h" 27 #include "iscsi_target.h" 28 #include "iscsi_target_auth.h" 29 30 #define MAX_LOGIN_PDUS 7 31 32 void convert_null_to_semi(char *buf, int len) 33 { 34 int i; 35 36 for (i = 0; i < len; i++) 37 if (buf[i] == '\0') 38 buf[i] = ';'; 39 } 40 41 static int strlen_semi(char *buf) 42 { 43 int i = 0; 44 45 while (buf[i] != '\0') { 46 if (buf[i] == ';') 47 return i; 48 i++; 49 } 50 51 return -1; 52 } 53 54 int extract_param( 55 const char *in_buf, 56 const char *pattern, 57 unsigned int max_length, 58 char *out_buf, 59 unsigned char *type) 60 { 61 char *ptr; 62 int len; 63 64 if (!in_buf || !pattern || !out_buf || !type) 65 return -EINVAL; 66 67 ptr = strstr(in_buf, pattern); 68 if (!ptr) 69 return -ENOENT; 70 71 ptr = strstr(ptr, "="); 72 if (!ptr) 73 return -EINVAL; 74 75 ptr += 1; 76 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 77 ptr += 2; /* skip 0x */ 78 *type = HEX; 79 } else if (*ptr == '0' && (*(ptr+1) == 'b' || *(ptr+1) == 'B')) { 80 ptr += 2; /* skip 0b */ 81 *type = BASE64; 82 } else 83 *type = DECIMAL; 84 85 len = strlen_semi(ptr); 86 if (len < 0) 87 return -EINVAL; 88 89 if (len >= max_length) { 90 pr_err("Length of input: %d exceeds max_length:" 91 " %d\n", len, max_length); 92 return -EINVAL; 93 } 94 memcpy(out_buf, ptr, len); 95 out_buf[len] = '\0'; 96 97 return 0; 98 } 99 100 static struct iscsi_node_auth *iscsi_get_node_auth(struct iscsit_conn *conn) 101 { 102 struct iscsi_portal_group *tpg; 103 struct iscsi_node_acl *nacl; 104 struct se_node_acl *se_nacl; 105 106 if (conn->sess->sess_ops->SessionType) 107 return &iscsit_global->discovery_acl.node_auth; 108 109 se_nacl = conn->sess->se_sess->se_node_acl; 110 if (!se_nacl) { 111 pr_err("Unable to locate struct se_node_acl for CHAP auth\n"); 112 return NULL; 113 } 114 115 if (se_nacl->dynamic_node_acl) { 116 tpg = to_iscsi_tpg(se_nacl->se_tpg); 117 return &tpg->tpg_demo_auth; 118 } 119 120 nacl = to_iscsi_nacl(se_nacl); 121 122 return &nacl->node_auth; 123 } 124 125 static u32 iscsi_handle_authentication( 126 struct iscsit_conn *conn, 127 char *in_buf, 128 char *out_buf, 129 int in_length, 130 int *out_length, 131 unsigned char *authtype) 132 { 133 struct iscsi_node_auth *auth; 134 135 auth = iscsi_get_node_auth(conn); 136 if (!auth) 137 return -1; 138 139 if (strstr("CHAP", authtype)) 140 strcpy(conn->sess->auth_type, "CHAP"); 141 else 142 strcpy(conn->sess->auth_type, NONE); 143 144 if (strstr("None", authtype)) 145 return 1; 146 else if (strstr("CHAP", authtype)) 147 return chap_main_loop(conn, auth, in_buf, out_buf, 148 &in_length, out_length); 149 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */ 150 return 2; 151 } 152 153 static void iscsi_remove_failed_auth_entry(struct iscsit_conn *conn) 154 { 155 kfree(conn->auth_protocol); 156 } 157 158 int iscsi_target_check_login_request( 159 struct iscsit_conn *conn, 160 struct iscsi_login *login) 161 { 162 int req_csg, req_nsg; 163 u32 payload_length; 164 struct iscsi_login_req *login_req; 165 166 login_req = (struct iscsi_login_req *) login->req; 167 payload_length = ntoh24(login_req->dlength); 168 169 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 170 case ISCSI_OP_LOGIN: 171 break; 172 default: 173 pr_err("Received unknown opcode 0x%02x.\n", 174 login_req->opcode & ISCSI_OPCODE_MASK); 175 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 176 ISCSI_LOGIN_STATUS_INIT_ERR); 177 return -1; 178 } 179 180 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 181 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 182 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 183 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 185 ISCSI_LOGIN_STATUS_INIT_ERR); 186 return -1; 187 } 188 189 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 190 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags); 191 192 if (req_csg != login->current_stage) { 193 pr_err("Initiator unexpectedly changed login stage" 194 " from %d to %d, login failed.\n", login->current_stage, 195 req_csg); 196 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 197 ISCSI_LOGIN_STATUS_INIT_ERR); 198 return -1; 199 } 200 201 if ((req_nsg == 2) || (req_csg >= 2) || 202 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 203 (req_nsg <= req_csg))) { 204 pr_err("Illegal login_req->flags Combination, CSG: %d," 205 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 206 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 207 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 208 ISCSI_LOGIN_STATUS_INIT_ERR); 209 return -1; 210 } 211 212 if ((login_req->max_version != login->version_max) || 213 (login_req->min_version != login->version_min)) { 214 pr_err("Login request changed Version Max/Nin" 215 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 216 login_req->max_version, login_req->min_version); 217 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 218 ISCSI_LOGIN_STATUS_INIT_ERR); 219 return -1; 220 } 221 222 if (memcmp(login_req->isid, login->isid, 6) != 0) { 223 pr_err("Login request changed ISID unexpectedly," 224 " protocol error.\n"); 225 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 226 ISCSI_LOGIN_STATUS_INIT_ERR); 227 return -1; 228 } 229 230 if (login_req->itt != login->init_task_tag) { 231 pr_err("Login request changed ITT unexpectedly to" 232 " 0x%08x, protocol error.\n", login_req->itt); 233 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 234 ISCSI_LOGIN_STATUS_INIT_ERR); 235 return -1; 236 } 237 238 if (payload_length > MAX_KEY_VALUE_PAIRS) { 239 pr_err("Login request payload exceeds default" 240 " MaxRecvDataSegmentLength: %u, protocol error.\n", 241 MAX_KEY_VALUE_PAIRS); 242 return -1; 243 } 244 245 return 0; 246 } 247 EXPORT_SYMBOL(iscsi_target_check_login_request); 248 249 static int iscsi_target_check_first_request( 250 struct iscsit_conn *conn, 251 struct iscsi_login *login) 252 { 253 struct iscsi_param *param = NULL; 254 struct se_node_acl *se_nacl; 255 256 login->first_request = 0; 257 258 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 259 if (!strncmp(param->name, SESSIONTYPE, 11)) { 260 if (!IS_PSTATE_ACCEPTOR(param)) { 261 pr_err("SessionType key not received" 262 " in first login request.\n"); 263 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 264 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 265 return -1; 266 } 267 if (!strncmp(param->value, DISCOVERY, 9)) 268 return 0; 269 } 270 271 if (!strncmp(param->name, INITIATORNAME, 13)) { 272 if (!IS_PSTATE_ACCEPTOR(param)) { 273 if (!login->leading_connection) 274 continue; 275 276 pr_err("InitiatorName key not received" 277 " in first login request.\n"); 278 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 279 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 280 return -1; 281 } 282 283 /* 284 * For non-leading connections, double check that the 285 * received InitiatorName matches the existing session's 286 * struct iscsi_node_acl. 287 */ 288 if (!login->leading_connection) { 289 se_nacl = conn->sess->se_sess->se_node_acl; 290 if (!se_nacl) { 291 pr_err("Unable to locate" 292 " struct se_node_acl\n"); 293 iscsit_tx_login_rsp(conn, 294 ISCSI_STATUS_CLS_INITIATOR_ERR, 295 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 296 return -1; 297 } 298 299 if (strcmp(param->value, 300 se_nacl->initiatorname)) { 301 pr_err("Incorrect" 302 " InitiatorName: %s for this" 303 " iSCSI Initiator Node.\n", 304 param->value); 305 iscsit_tx_login_rsp(conn, 306 ISCSI_STATUS_CLS_INITIATOR_ERR, 307 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 308 return -1; 309 } 310 } 311 } 312 } 313 314 return 0; 315 } 316 317 static int iscsi_target_do_tx_login_io(struct iscsit_conn *conn, struct iscsi_login *login) 318 { 319 u32 padding = 0; 320 struct iscsi_login_rsp *login_rsp; 321 322 login_rsp = (struct iscsi_login_rsp *) login->rsp; 323 324 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 325 hton24(login_rsp->dlength, login->rsp_length); 326 memcpy(login_rsp->isid, login->isid, 6); 327 login_rsp->tsih = cpu_to_be16(login->tsih); 328 login_rsp->itt = login->init_task_tag; 329 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 330 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 331 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 332 333 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 334 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 335 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt, 336 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 337 ntohl(login_rsp->statsn), login->rsp_length); 338 339 padding = ((-login->rsp_length) & 3); 340 /* 341 * Before sending the last login response containing the transition 342 * bit for full-feature-phase, go ahead and start up TX/RX threads 343 * now to avoid potential resource allocation failures after the 344 * final login response has been sent. 345 */ 346 if (login->login_complete) { 347 int rc = iscsit_start_kthreads(conn); 348 if (rc) { 349 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 350 ISCSI_LOGIN_STATUS_NO_RESOURCES); 351 return -1; 352 } 353 } 354 355 if (conn->conn_transport->iscsit_put_login_tx(conn, login, 356 login->rsp_length + padding) < 0) 357 goto err; 358 359 login->rsp_length = 0; 360 361 return 0; 362 363 err: 364 if (login->login_complete) { 365 if (conn->rx_thread && conn->rx_thread_active) { 366 send_sig(SIGINT, conn->rx_thread, 1); 367 complete(&conn->rx_login_comp); 368 kthread_stop(conn->rx_thread); 369 } 370 if (conn->tx_thread && conn->tx_thread_active) { 371 send_sig(SIGINT, conn->tx_thread, 1); 372 kthread_stop(conn->tx_thread); 373 } 374 spin_lock(&iscsit_global->ts_bitmap_lock); 375 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 376 get_order(1)); 377 spin_unlock(&iscsit_global->ts_bitmap_lock); 378 } 379 return -1; 380 } 381 382 static void iscsi_target_sk_data_ready(struct sock *sk) 383 { 384 struct iscsit_conn *conn = sk->sk_user_data; 385 bool rc; 386 387 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn); 388 389 write_lock_bh(&sk->sk_callback_lock); 390 if (!sk->sk_user_data) { 391 write_unlock_bh(&sk->sk_callback_lock); 392 return; 393 } 394 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 395 write_unlock_bh(&sk->sk_callback_lock); 396 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn); 397 return; 398 } 399 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 400 write_unlock_bh(&sk->sk_callback_lock); 401 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn); 402 return; 403 } 404 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 405 write_unlock_bh(&sk->sk_callback_lock); 406 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn); 407 if (iscsi_target_sk_data_ready == conn->orig_data_ready) 408 return; 409 conn->orig_data_ready(sk); 410 return; 411 } 412 413 rc = schedule_delayed_work(&conn->login_work, 0); 414 if (!rc) { 415 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 416 " got false\n"); 417 } 418 write_unlock_bh(&sk->sk_callback_lock); 419 } 420 421 static void iscsi_target_sk_state_change(struct sock *); 422 423 static void iscsi_target_set_sock_callbacks(struct iscsit_conn *conn) 424 { 425 struct sock *sk; 426 427 if (!conn->sock) 428 return; 429 430 sk = conn->sock->sk; 431 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 432 433 write_lock_bh(&sk->sk_callback_lock); 434 sk->sk_user_data = conn; 435 conn->orig_data_ready = sk->sk_data_ready; 436 conn->orig_state_change = sk->sk_state_change; 437 sk->sk_data_ready = iscsi_target_sk_data_ready; 438 sk->sk_state_change = iscsi_target_sk_state_change; 439 write_unlock_bh(&sk->sk_callback_lock); 440 441 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 442 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 443 } 444 445 static void iscsi_target_restore_sock_callbacks(struct iscsit_conn *conn) 446 { 447 struct sock *sk; 448 449 if (!conn->sock) 450 return; 451 452 sk = conn->sock->sk; 453 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 454 455 write_lock_bh(&sk->sk_callback_lock); 456 if (!sk->sk_user_data) { 457 write_unlock_bh(&sk->sk_callback_lock); 458 return; 459 } 460 sk->sk_user_data = NULL; 461 sk->sk_data_ready = conn->orig_data_ready; 462 sk->sk_state_change = conn->orig_state_change; 463 write_unlock_bh(&sk->sk_callback_lock); 464 465 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 466 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 467 } 468 469 static int iscsi_target_do_login(struct iscsit_conn *, struct iscsi_login *); 470 471 static bool __iscsi_target_sk_check_close(struct sock *sk) 472 { 473 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 474 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE," 475 "returning TRUE\n"); 476 return true; 477 } 478 return false; 479 } 480 481 static bool iscsi_target_sk_check_close(struct iscsit_conn *conn) 482 { 483 bool state = false; 484 485 if (conn->sock) { 486 struct sock *sk = conn->sock->sk; 487 488 read_lock_bh(&sk->sk_callback_lock); 489 state = (__iscsi_target_sk_check_close(sk) || 490 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 491 read_unlock_bh(&sk->sk_callback_lock); 492 } 493 return state; 494 } 495 496 static bool iscsi_target_sk_check_flag(struct iscsit_conn *conn, unsigned int flag) 497 { 498 bool state = false; 499 500 if (conn->sock) { 501 struct sock *sk = conn->sock->sk; 502 503 read_lock_bh(&sk->sk_callback_lock); 504 state = test_bit(flag, &conn->login_flags); 505 read_unlock_bh(&sk->sk_callback_lock); 506 } 507 return state; 508 } 509 510 static bool iscsi_target_sk_check_and_clear(struct iscsit_conn *conn, unsigned int flag) 511 { 512 bool state = false; 513 514 if (conn->sock) { 515 struct sock *sk = conn->sock->sk; 516 517 write_lock_bh(&sk->sk_callback_lock); 518 state = (__iscsi_target_sk_check_close(sk) || 519 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 520 if (!state) 521 clear_bit(flag, &conn->login_flags); 522 write_unlock_bh(&sk->sk_callback_lock); 523 } 524 return state; 525 } 526 527 static void iscsi_target_login_drop(struct iscsit_conn *conn, struct iscsi_login *login) 528 { 529 bool zero_tsih = login->zero_tsih; 530 531 iscsi_remove_failed_auth_entry(conn); 532 iscsi_target_nego_release(conn); 533 iscsi_target_login_sess_out(conn, zero_tsih, true); 534 } 535 536 struct conn_timeout { 537 struct timer_list timer; 538 struct iscsit_conn *conn; 539 }; 540 541 static void iscsi_target_login_timeout(struct timer_list *t) 542 { 543 struct conn_timeout *timeout = from_timer(timeout, t, timer); 544 struct iscsit_conn *conn = timeout->conn; 545 546 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 547 548 if (conn->login_kworker) { 549 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 550 conn->login_kworker->comm, conn->login_kworker->pid); 551 send_sig(SIGINT, conn->login_kworker, 1); 552 } 553 } 554 555 static void iscsi_target_do_login_rx(struct work_struct *work) 556 { 557 struct iscsit_conn *conn = container_of(work, 558 struct iscsit_conn, login_work.work); 559 struct iscsi_login *login = conn->login; 560 struct iscsi_np *np = login->np; 561 struct iscsi_portal_group *tpg = conn->tpg; 562 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 563 struct conn_timeout timeout; 564 int rc, zero_tsih = login->zero_tsih; 565 bool state; 566 567 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 568 conn, current->comm, current->pid); 569 /* 570 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 571 * before initial PDU processing in iscsi_target_start_negotiation() 572 * has completed, go ahead and retry until it's cleared. 573 * 574 * Otherwise if the TCP connection drops while this is occuring, 575 * iscsi_target_start_negotiation() will detect the failure, call 576 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 577 * remaining iscsi connection resources from iscsi_np process context. 578 */ 579 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 580 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 581 return; 582 } 583 584 spin_lock(&tpg->tpg_state_lock); 585 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 586 spin_unlock(&tpg->tpg_state_lock); 587 588 if (!state) { 589 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 590 goto err; 591 } 592 593 if (iscsi_target_sk_check_close(conn)) { 594 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 595 goto err; 596 } 597 598 conn->login_kworker = current; 599 allow_signal(SIGINT); 600 601 timeout.conn = conn; 602 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0); 603 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 604 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid); 605 606 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 607 del_timer_sync(&timeout.timer); 608 destroy_timer_on_stack(&timeout.timer); 609 flush_signals(current); 610 conn->login_kworker = NULL; 611 612 if (rc < 0) 613 goto err; 614 615 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 616 conn, current->comm, current->pid); 617 618 /* 619 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready 620 * could be triggered again after this. 621 * 622 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully 623 * process a login PDU, so that sk_state_chage can do login 624 * cleanup as needed if the socket is closed. If a delayed work is 625 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE), 626 * sk_state_change will leave the cleanup to the delayed work or 627 * it will schedule a delayed work to do cleanup. 628 */ 629 if (conn->sock) { 630 struct sock *sk = conn->sock->sk; 631 632 write_lock_bh(&sk->sk_callback_lock); 633 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) { 634 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags); 635 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags); 636 } 637 write_unlock_bh(&sk->sk_callback_lock); 638 } 639 640 rc = iscsi_target_do_login(conn, login); 641 if (rc < 0) { 642 goto err; 643 } else if (!rc) { 644 if (iscsi_target_sk_check_and_clear(conn, 645 LOGIN_FLAGS_WRITE_ACTIVE)) 646 goto err; 647 } else if (rc == 1) { 648 cancel_delayed_work(&conn->login_work); 649 iscsi_target_nego_release(conn); 650 iscsi_post_login_handler(np, conn, zero_tsih); 651 iscsit_deaccess_np(np, tpg, tpg_np); 652 } 653 return; 654 655 err: 656 iscsi_target_restore_sock_callbacks(conn); 657 cancel_delayed_work(&conn->login_work); 658 iscsi_target_login_drop(conn, login); 659 iscsit_deaccess_np(np, tpg, tpg_np); 660 } 661 662 static void iscsi_target_sk_state_change(struct sock *sk) 663 { 664 struct iscsit_conn *conn; 665 void (*orig_state_change)(struct sock *); 666 bool state; 667 668 pr_debug("Entering iscsi_target_sk_state_change\n"); 669 670 write_lock_bh(&sk->sk_callback_lock); 671 conn = sk->sk_user_data; 672 if (!conn) { 673 write_unlock_bh(&sk->sk_callback_lock); 674 return; 675 } 676 orig_state_change = conn->orig_state_change; 677 678 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 679 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 680 conn); 681 write_unlock_bh(&sk->sk_callback_lock); 682 orig_state_change(sk); 683 return; 684 } 685 state = __iscsi_target_sk_check_close(sk); 686 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 687 688 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) || 689 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) { 690 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1" 691 " sk_state_change conn: %p\n", conn); 692 if (state) 693 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 694 write_unlock_bh(&sk->sk_callback_lock); 695 orig_state_change(sk); 696 return; 697 } 698 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 699 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 700 conn); 701 write_unlock_bh(&sk->sk_callback_lock); 702 orig_state_change(sk); 703 return; 704 } 705 /* 706 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 707 * but only queue conn->login_work -> iscsi_target_do_login_rx() 708 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 709 * 710 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 711 * will detect the dropped TCP connection from delayed workqueue context. 712 * 713 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 714 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 715 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 716 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 717 * dropped TCP connection in iscsi_np process context, and cleaning up 718 * the remaining iscsi connection resources. 719 */ 720 if (state) { 721 pr_debug("iscsi_target_sk_state_change got failed state\n"); 722 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 723 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 724 write_unlock_bh(&sk->sk_callback_lock); 725 726 orig_state_change(sk); 727 728 if (!state) 729 schedule_delayed_work(&conn->login_work, 0); 730 return; 731 } 732 write_unlock_bh(&sk->sk_callback_lock); 733 734 orig_state_change(sk); 735 } 736 737 /* 738 * NOTE: We check for existing sessions or connections AFTER the initiator 739 * has been successfully authenticated in order to protect against faked 740 * ISID/TSIH combinations. 741 */ 742 static int iscsi_target_check_for_existing_instances( 743 struct iscsit_conn *conn, 744 struct iscsi_login *login) 745 { 746 if (login->checked_for_existing) 747 return 0; 748 749 login->checked_for_existing = 1; 750 751 if (!login->tsih) 752 return iscsi_check_for_session_reinstatement(conn); 753 else 754 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 755 login->initial_exp_statsn); 756 } 757 758 static int iscsi_target_do_authentication( 759 struct iscsit_conn *conn, 760 struct iscsi_login *login) 761 { 762 int authret; 763 u32 payload_length; 764 struct iscsi_param *param; 765 struct iscsi_login_req *login_req; 766 struct iscsi_login_rsp *login_rsp; 767 768 login_req = (struct iscsi_login_req *) login->req; 769 login_rsp = (struct iscsi_login_rsp *) login->rsp; 770 payload_length = ntoh24(login_req->dlength); 771 772 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 773 if (!param) 774 return -1; 775 776 authret = iscsi_handle_authentication( 777 conn, 778 login->req_buf, 779 login->rsp_buf, 780 payload_length, 781 &login->rsp_length, 782 param->value); 783 switch (authret) { 784 case 0: 785 pr_debug("Received OK response" 786 " from LIO Authentication, continuing.\n"); 787 break; 788 case 1: 789 pr_debug("iSCSI security negotiation" 790 " completed successfully.\n"); 791 login->auth_complete = 1; 792 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 793 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 794 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 795 ISCSI_FLAG_LOGIN_TRANSIT); 796 login->current_stage = 1; 797 } 798 return iscsi_target_check_for_existing_instances( 799 conn, login); 800 case 2: 801 pr_err("Security negotiation" 802 " failed.\n"); 803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 804 ISCSI_LOGIN_STATUS_AUTH_FAILED); 805 return -1; 806 default: 807 pr_err("Received unknown error %d from LIO" 808 " Authentication\n", authret); 809 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 810 ISCSI_LOGIN_STATUS_TARGET_ERROR); 811 return -1; 812 } 813 814 return 0; 815 } 816 817 bool iscsi_conn_auth_required(struct iscsit_conn *conn) 818 { 819 struct iscsi_node_acl *nacl; 820 struct se_node_acl *se_nacl; 821 822 if (conn->sess->sess_ops->SessionType) { 823 /* 824 * For SessionType=Discovery 825 */ 826 return conn->tpg->tpg_attrib.authentication; 827 } 828 /* 829 * For SessionType=Normal 830 */ 831 se_nacl = conn->sess->se_sess->se_node_acl; 832 if (!se_nacl) { 833 pr_debug("Unknown ACL is trying to connect\n"); 834 return true; 835 } 836 837 if (se_nacl->dynamic_node_acl) { 838 pr_debug("Dynamic ACL %s is trying to connect\n", 839 se_nacl->initiatorname); 840 return conn->tpg->tpg_attrib.authentication; 841 } 842 843 pr_debug("Known ACL %s is trying to connect\n", 844 se_nacl->initiatorname); 845 846 nacl = to_iscsi_nacl(se_nacl); 847 if (nacl->node_attrib.authentication == NA_AUTHENTICATION_INHERITED) 848 return conn->tpg->tpg_attrib.authentication; 849 850 return nacl->node_attrib.authentication; 851 } 852 853 static int iscsi_target_handle_csg_zero( 854 struct iscsit_conn *conn, 855 struct iscsi_login *login) 856 { 857 int ret; 858 u32 payload_length; 859 struct iscsi_param *param; 860 struct iscsi_login_req *login_req; 861 struct iscsi_login_rsp *login_rsp; 862 863 login_req = (struct iscsi_login_req *) login->req; 864 login_rsp = (struct iscsi_login_rsp *) login->rsp; 865 payload_length = ntoh24(login_req->dlength); 866 867 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 868 if (!param) 869 return -1; 870 871 ret = iscsi_decode_text_input( 872 PHASE_SECURITY|PHASE_DECLARATIVE, 873 SENDER_INITIATOR|SENDER_RECEIVER, 874 login->req_buf, 875 payload_length, 876 conn); 877 if (ret < 0) 878 return -1; 879 880 if (ret > 0) { 881 if (login->auth_complete) { 882 pr_err("Initiator has already been" 883 " successfully authenticated, but is still" 884 " sending %s keys.\n", param->value); 885 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 886 ISCSI_LOGIN_STATUS_INIT_ERR); 887 return -1; 888 } 889 890 goto do_auth; 891 } else if (!payload_length) { 892 pr_err("Initiator sent zero length security payload," 893 " login failed\n"); 894 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 895 ISCSI_LOGIN_STATUS_AUTH_FAILED); 896 return -1; 897 } 898 899 if (login->first_request) 900 if (iscsi_target_check_first_request(conn, login) < 0) 901 return -1; 902 903 ret = iscsi_encode_text_output( 904 PHASE_SECURITY|PHASE_DECLARATIVE, 905 SENDER_TARGET, 906 login->rsp_buf, 907 &login->rsp_length, 908 conn->param_list, 909 conn->tpg->tpg_attrib.login_keys_workaround); 910 if (ret < 0) 911 return -1; 912 913 if (!iscsi_check_negotiated_keys(conn->param_list)) { 914 bool auth_required = iscsi_conn_auth_required(conn); 915 916 if (auth_required) { 917 if (!strncmp(param->value, NONE, 4)) { 918 pr_err("Initiator sent AuthMethod=None but" 919 " Target is enforcing iSCSI Authentication," 920 " login failed.\n"); 921 iscsit_tx_login_rsp(conn, 922 ISCSI_STATUS_CLS_INITIATOR_ERR, 923 ISCSI_LOGIN_STATUS_AUTH_FAILED); 924 return -1; 925 } 926 927 if (!login->auth_complete) 928 return 0; 929 930 if (strncmp(param->value, NONE, 4) && 931 !login->auth_complete) 932 return 0; 933 } 934 935 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 936 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 937 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 938 ISCSI_FLAG_LOGIN_TRANSIT; 939 login->current_stage = 1; 940 } 941 } 942 943 return 0; 944 do_auth: 945 return iscsi_target_do_authentication(conn, login); 946 } 947 948 static bool iscsi_conn_authenticated(struct iscsit_conn *conn, 949 struct iscsi_login *login) 950 { 951 if (!iscsi_conn_auth_required(conn)) 952 return true; 953 954 if (login->auth_complete) 955 return true; 956 957 return false; 958 } 959 960 static int iscsi_target_handle_csg_one(struct iscsit_conn *conn, struct iscsi_login *login) 961 { 962 int ret; 963 u32 payload_length; 964 struct iscsi_login_req *login_req; 965 struct iscsi_login_rsp *login_rsp; 966 967 login_req = (struct iscsi_login_req *) login->req; 968 login_rsp = (struct iscsi_login_rsp *) login->rsp; 969 payload_length = ntoh24(login_req->dlength); 970 971 ret = iscsi_decode_text_input( 972 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 973 SENDER_INITIATOR|SENDER_RECEIVER, 974 login->req_buf, 975 payload_length, 976 conn); 977 if (ret < 0) { 978 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 979 ISCSI_LOGIN_STATUS_INIT_ERR); 980 return -1; 981 } 982 983 if (login->first_request) 984 if (iscsi_target_check_first_request(conn, login) < 0) 985 return -1; 986 987 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 988 return -1; 989 990 ret = iscsi_encode_text_output( 991 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 992 SENDER_TARGET, 993 login->rsp_buf, 994 &login->rsp_length, 995 conn->param_list, 996 conn->tpg->tpg_attrib.login_keys_workaround); 997 if (ret < 0) { 998 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 999 ISCSI_LOGIN_STATUS_INIT_ERR); 1000 return -1; 1001 } 1002 1003 if (!iscsi_conn_authenticated(conn, login)) { 1004 pr_err("Initiator is requesting CSG: 1, has not been" 1005 " successfully authenticated, and the Target is" 1006 " enforcing iSCSI Authentication, login failed.\n"); 1007 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1008 ISCSI_LOGIN_STATUS_AUTH_FAILED); 1009 return -1; 1010 } 1011 1012 if (!iscsi_check_negotiated_keys(conn->param_list)) 1013 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 1014 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 1015 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 1016 ISCSI_FLAG_LOGIN_TRANSIT; 1017 1018 return 0; 1019 } 1020 1021 /* 1022 * RETURN VALUE: 1023 * 1024 * 1 = Login successful 1025 * -1 = Login failed 1026 * 0 = More PDU exchanges required 1027 */ 1028 static int iscsi_target_do_login(struct iscsit_conn *conn, struct iscsi_login *login) 1029 { 1030 int pdu_count = 0; 1031 struct iscsi_login_req *login_req; 1032 struct iscsi_login_rsp *login_rsp; 1033 1034 login_req = (struct iscsi_login_req *) login->req; 1035 login_rsp = (struct iscsi_login_rsp *) login->rsp; 1036 1037 while (1) { 1038 if (++pdu_count > MAX_LOGIN_PDUS) { 1039 pr_err("MAX_LOGIN_PDUS count reached.\n"); 1040 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1041 ISCSI_LOGIN_STATUS_TARGET_ERROR); 1042 return -1; 1043 } 1044 1045 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 1046 case 0: 1047 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 1048 if (iscsi_target_handle_csg_zero(conn, login) < 0) 1049 return -1; 1050 break; 1051 case 1: 1052 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 1053 if (iscsi_target_handle_csg_one(conn, login) < 0) 1054 return -1; 1055 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1056 /* 1057 * Check to make sure the TCP connection has not 1058 * dropped asynchronously while session reinstatement 1059 * was occuring in this kthread context, before 1060 * transitioning to full feature phase operation. 1061 */ 1062 if (iscsi_target_sk_check_close(conn)) 1063 return -1; 1064 1065 login->tsih = conn->sess->tsih; 1066 login->login_complete = 1; 1067 iscsi_target_restore_sock_callbacks(conn); 1068 if (iscsi_target_do_tx_login_io(conn, 1069 login) < 0) 1070 return -1; 1071 return 1; 1072 } 1073 break; 1074 default: 1075 pr_err("Illegal CSG: %d received from" 1076 " Initiator, protocol error.\n", 1077 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1078 break; 1079 } 1080 1081 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1082 return -1; 1083 1084 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1085 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1086 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1087 } 1088 break; 1089 } 1090 1091 return 0; 1092 } 1093 1094 static void iscsi_initiatorname_tolower( 1095 char *param_buf) 1096 { 1097 char *c; 1098 u32 iqn_size = strlen(param_buf), i; 1099 1100 for (i = 0; i < iqn_size; i++) { 1101 c = ¶m_buf[i]; 1102 if (!isupper(*c)) 1103 continue; 1104 1105 *c = tolower(*c); 1106 } 1107 } 1108 1109 /* 1110 * Processes the first Login Request.. 1111 */ 1112 int iscsi_target_locate_portal( 1113 struct iscsi_np *np, 1114 struct iscsit_conn *conn, 1115 struct iscsi_login *login) 1116 { 1117 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1118 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1119 struct iscsit_session *sess = conn->sess; 1120 struct iscsi_tiqn *tiqn; 1121 struct iscsi_tpg_np *tpg_np = NULL; 1122 struct iscsi_login_req *login_req; 1123 struct se_node_acl *se_nacl; 1124 u32 payload_length, queue_depth = 0; 1125 int sessiontype = 0, ret = 0, tag_num, tag_size; 1126 1127 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1128 iscsi_target_set_sock_callbacks(conn); 1129 1130 login->np = np; 1131 1132 login_req = (struct iscsi_login_req *) login->req; 1133 payload_length = ntoh24(login_req->dlength); 1134 1135 tmpbuf = kmemdup_nul(login->req_buf, payload_length, GFP_KERNEL); 1136 if (!tmpbuf) { 1137 pr_err("Unable to allocate memory for tmpbuf.\n"); 1138 return -1; 1139 } 1140 1141 start = tmpbuf; 1142 end = (start + payload_length); 1143 1144 /* 1145 * Locate the initial keys expected from the Initiator node in 1146 * the first login request in order to progress with the login phase. 1147 */ 1148 while (start < end) { 1149 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1150 ret = -1; 1151 goto out; 1152 } 1153 1154 if (!strncmp(key, "InitiatorName", 13)) 1155 i_buf = value; 1156 else if (!strncmp(key, "SessionType", 11)) 1157 s_buf = value; 1158 else if (!strncmp(key, "TargetName", 10)) 1159 t_buf = value; 1160 1161 start += strlen(key) + strlen(value) + 2; 1162 } 1163 /* 1164 * See 5.3. Login Phase. 1165 */ 1166 if (!i_buf) { 1167 pr_err("InitiatorName key not received" 1168 " in first login request.\n"); 1169 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1170 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1171 ret = -1; 1172 goto out; 1173 } 1174 /* 1175 * Convert the incoming InitiatorName to lowercase following 1176 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1177 * are NOT case sensitive. 1178 */ 1179 iscsi_initiatorname_tolower(i_buf); 1180 1181 if (!s_buf) { 1182 if (!login->leading_connection) 1183 goto get_target; 1184 1185 pr_err("SessionType key not received" 1186 " in first login request.\n"); 1187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1188 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1189 ret = -1; 1190 goto out; 1191 } 1192 1193 /* 1194 * Use default portal group for discovery sessions. 1195 */ 1196 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1197 if (!sessiontype) { 1198 conn->tpg = iscsit_global->discovery_tpg; 1199 if (!login->leading_connection) 1200 goto get_target; 1201 1202 sess->sess_ops->SessionType = 1; 1203 /* 1204 * Setup crc32c modules from libcrypto 1205 */ 1206 if (iscsi_login_setup_crypto(conn) < 0) { 1207 pr_err("iscsi_login_setup_crypto() failed\n"); 1208 ret = -1; 1209 goto out; 1210 } 1211 /* 1212 * Serialize access across the discovery struct iscsi_portal_group to 1213 * process login attempt. 1214 */ 1215 if (iscsit_access_np(np, conn->tpg) < 0) { 1216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1217 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1218 ret = -1; 1219 goto out; 1220 } 1221 ret = 0; 1222 goto alloc_tags; 1223 } 1224 1225 get_target: 1226 if (!t_buf) { 1227 pr_err("TargetName key not received" 1228 " in first login request while" 1229 " SessionType=Normal.\n"); 1230 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1231 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1232 ret = -1; 1233 goto out; 1234 } 1235 1236 /* 1237 * Locate Target IQN from Storage Node. 1238 */ 1239 tiqn = iscsit_get_tiqn_for_login(t_buf); 1240 if (!tiqn) { 1241 pr_err("Unable to locate Target IQN: %s in" 1242 " Storage Node\n", t_buf); 1243 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1244 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1245 ret = -1; 1246 goto out; 1247 } 1248 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1249 1250 /* 1251 * Locate Target Portal Group from Storage Node. 1252 */ 1253 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1254 if (!conn->tpg) { 1255 pr_err("Unable to locate Target Portal Group" 1256 " on %s\n", tiqn->tiqn); 1257 iscsit_put_tiqn_for_login(tiqn); 1258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1259 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1260 ret = -1; 1261 goto out; 1262 } 1263 conn->tpg_np = tpg_np; 1264 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1265 /* 1266 * Setup crc32c modules from libcrypto 1267 */ 1268 if (iscsi_login_setup_crypto(conn) < 0) { 1269 pr_err("iscsi_login_setup_crypto() failed\n"); 1270 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1271 iscsit_put_tiqn_for_login(tiqn); 1272 conn->tpg = NULL; 1273 ret = -1; 1274 goto out; 1275 } 1276 /* 1277 * Serialize access across the struct iscsi_portal_group to 1278 * process login attempt. 1279 */ 1280 if (iscsit_access_np(np, conn->tpg) < 0) { 1281 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1282 iscsit_put_tiqn_for_login(tiqn); 1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1284 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1285 conn->tpg = NULL; 1286 ret = -1; 1287 goto out; 1288 } 1289 1290 /* 1291 * conn->sess->node_acl will be set when the referenced 1292 * struct iscsit_session is located from received ISID+TSIH in 1293 * iscsi_login_non_zero_tsih_s2(). 1294 */ 1295 if (!login->leading_connection) { 1296 ret = 0; 1297 goto out; 1298 } 1299 1300 /* 1301 * This value is required in iscsi_login_zero_tsih_s2() 1302 */ 1303 sess->sess_ops->SessionType = 0; 1304 1305 /* 1306 * Locate incoming Initiator IQN reference from Storage Node. 1307 */ 1308 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1309 &conn->tpg->tpg_se_tpg, i_buf); 1310 if (!sess->se_sess->se_node_acl) { 1311 pr_err("iSCSI Initiator Node: %s is not authorized to" 1312 " access iSCSI target portal group: %hu.\n", 1313 i_buf, conn->tpg->tpgt); 1314 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1315 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1316 ret = -1; 1317 goto out; 1318 } 1319 se_nacl = sess->se_sess->se_node_acl; 1320 queue_depth = se_nacl->queue_depth; 1321 /* 1322 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1323 * depth for non immediate commands, plus extra tags for immediate 1324 * commands. 1325 * 1326 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1327 * in per-cpu-ida tag allocation logic + small queue_depth. 1328 */ 1329 alloc_tags: 1330 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1331 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1332 tag_size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size; 1333 1334 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1335 if (ret < 0) { 1336 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1337 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1338 ret = -1; 1339 } 1340 out: 1341 kfree(tmpbuf); 1342 return ret; 1343 } 1344 1345 int iscsi_target_start_negotiation( 1346 struct iscsi_login *login, 1347 struct iscsit_conn *conn) 1348 { 1349 int ret; 1350 1351 if (conn->sock) { 1352 struct sock *sk = conn->sock->sk; 1353 1354 write_lock_bh(&sk->sk_callback_lock); 1355 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1356 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1357 write_unlock_bh(&sk->sk_callback_lock); 1358 } 1359 /* 1360 * If iscsi_target_do_login returns zero to signal more PDU 1361 * exchanges are required to complete the login, go ahead and 1362 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1363 * is still active. 1364 * 1365 * Otherwise if TCP connection dropped asynchronously, go ahead 1366 * and perform connection cleanup now. 1367 */ 1368 ret = iscsi_target_do_login(conn, login); 1369 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1370 ret = -1; 1371 1372 if (ret < 0) { 1373 iscsi_target_restore_sock_callbacks(conn); 1374 iscsi_remove_failed_auth_entry(conn); 1375 } 1376 if (ret != 0) { 1377 cancel_delayed_work_sync(&conn->login_work); 1378 iscsi_target_nego_release(conn); 1379 } 1380 1381 return ret; 1382 } 1383 1384 void iscsi_target_nego_release(struct iscsit_conn *conn) 1385 { 1386 struct iscsi_login *login = conn->conn_login; 1387 1388 if (!login) 1389 return; 1390 1391 kfree(login->req_buf); 1392 kfree(login->rsp_buf); 1393 kfree(login); 1394 1395 conn->conn_login = NULL; 1396 } 1397