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