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