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 #define TEXT_LEN 4096 32 33 void convert_null_to_semi(char *buf, int len) 34 { 35 int i; 36 37 for (i = 0; i < len; i++) 38 if (buf[i] == '\0') 39 buf[i] = ';'; 40 } 41 42 static int strlen_semi(char *buf) 43 { 44 int i = 0; 45 46 while (buf[i] != '\0') { 47 if (buf[i] == ';') 48 return i; 49 i++; 50 } 51 52 return -1; 53 } 54 55 int extract_param( 56 const char *in_buf, 57 const char *pattern, 58 unsigned int max_length, 59 char *out_buf, 60 unsigned char *type) 61 { 62 char *ptr; 63 int len; 64 65 if (!in_buf || !pattern || !out_buf || !type) 66 return -1; 67 68 ptr = strstr(in_buf, pattern); 69 if (!ptr) 70 return -1; 71 72 ptr = strstr(ptr, "="); 73 if (!ptr) 74 return -1; 75 76 ptr += 1; 77 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 78 ptr += 2; /* skip 0x */ 79 *type = HEX; 80 } else 81 *type = DECIMAL; 82 83 len = strlen_semi(ptr); 84 if (len < 0) 85 return -1; 86 87 if (len >= max_length) { 88 pr_err("Length of input: %d exceeds max_length:" 89 " %d\n", len, max_length); 90 return -1; 91 } 92 memcpy(out_buf, ptr, len); 93 out_buf[len] = '\0'; 94 95 return 0; 96 } 97 98 static u32 iscsi_handle_authentication( 99 struct iscsi_conn *conn, 100 char *in_buf, 101 char *out_buf, 102 int in_length, 103 int *out_length, 104 unsigned char *authtype) 105 { 106 struct iscsi_session *sess = conn->sess; 107 struct iscsi_node_auth *auth; 108 struct iscsi_node_acl *iscsi_nacl; 109 struct iscsi_portal_group *iscsi_tpg; 110 struct se_node_acl *se_nacl; 111 112 if (!sess->sess_ops->SessionType) { 113 /* 114 * For SessionType=Normal 115 */ 116 se_nacl = conn->sess->se_sess->se_node_acl; 117 if (!se_nacl) { 118 pr_err("Unable to locate struct se_node_acl for" 119 " CHAP auth\n"); 120 return -1; 121 } 122 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 123 se_node_acl); 124 if (!iscsi_nacl) { 125 pr_err("Unable to locate struct iscsi_node_acl for" 126 " CHAP auth\n"); 127 return -1; 128 } 129 130 if (se_nacl->dynamic_node_acl) { 131 iscsi_tpg = container_of(se_nacl->se_tpg, 132 struct iscsi_portal_group, tpg_se_tpg); 133 134 auth = &iscsi_tpg->tpg_demo_auth; 135 } else { 136 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 137 se_node_acl); 138 139 auth = &iscsi_nacl->node_auth; 140 } 141 } else { 142 /* 143 * For SessionType=Discovery 144 */ 145 auth = &iscsit_global->discovery_acl.node_auth; 146 } 147 148 if (strstr("CHAP", authtype)) 149 strcpy(conn->sess->auth_type, "CHAP"); 150 else 151 strcpy(conn->sess->auth_type, NONE); 152 153 if (strstr("None", authtype)) 154 return 1; 155 else if (strstr("CHAP", authtype)) 156 return chap_main_loop(conn, auth, in_buf, out_buf, 157 &in_length, out_length); 158 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */ 159 return 2; 160 } 161 162 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 163 { 164 kfree(conn->auth_protocol); 165 } 166 167 int iscsi_target_check_login_request( 168 struct iscsi_conn *conn, 169 struct iscsi_login *login) 170 { 171 int req_csg, req_nsg; 172 u32 payload_length; 173 struct iscsi_login_req *login_req; 174 175 login_req = (struct iscsi_login_req *) login->req; 176 payload_length = ntoh24(login_req->dlength); 177 178 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 179 case ISCSI_OP_LOGIN: 180 break; 181 default: 182 pr_err("Received unknown opcode 0x%02x.\n", 183 login_req->opcode & ISCSI_OPCODE_MASK); 184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 185 ISCSI_LOGIN_STATUS_INIT_ERR); 186 return -1; 187 } 188 189 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 190 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 191 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 192 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 193 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 194 ISCSI_LOGIN_STATUS_INIT_ERR); 195 return -1; 196 } 197 198 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 199 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags); 200 201 if (req_csg != login->current_stage) { 202 pr_err("Initiator unexpectedly changed login stage" 203 " from %d to %d, login failed.\n", login->current_stage, 204 req_csg); 205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 206 ISCSI_LOGIN_STATUS_INIT_ERR); 207 return -1; 208 } 209 210 if ((req_nsg == 2) || (req_csg >= 2) || 211 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 212 (req_nsg <= req_csg))) { 213 pr_err("Illegal login_req->flags Combination, CSG: %d," 214 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 215 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 217 ISCSI_LOGIN_STATUS_INIT_ERR); 218 return -1; 219 } 220 221 if ((login_req->max_version != login->version_max) || 222 (login_req->min_version != login->version_min)) { 223 pr_err("Login request changed Version Max/Nin" 224 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 225 login_req->max_version, login_req->min_version); 226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 227 ISCSI_LOGIN_STATUS_INIT_ERR); 228 return -1; 229 } 230 231 if (memcmp(login_req->isid, login->isid, 6) != 0) { 232 pr_err("Login request changed ISID unexpectedly," 233 " protocol error.\n"); 234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 235 ISCSI_LOGIN_STATUS_INIT_ERR); 236 return -1; 237 } 238 239 if (login_req->itt != login->init_task_tag) { 240 pr_err("Login request changed ITT unexpectedly to" 241 " 0x%08x, protocol error.\n", login_req->itt); 242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 243 ISCSI_LOGIN_STATUS_INIT_ERR); 244 return -1; 245 } 246 247 if (payload_length > MAX_KEY_VALUE_PAIRS) { 248 pr_err("Login request payload exceeds default" 249 " MaxRecvDataSegmentLength: %u, protocol error.\n", 250 MAX_KEY_VALUE_PAIRS); 251 return -1; 252 } 253 254 return 0; 255 } 256 EXPORT_SYMBOL(iscsi_target_check_login_request); 257 258 static int iscsi_target_check_first_request( 259 struct iscsi_conn *conn, 260 struct iscsi_login *login) 261 { 262 struct iscsi_param *param = NULL; 263 struct se_node_acl *se_nacl; 264 265 login->first_request = 0; 266 267 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 268 if (!strncmp(param->name, SESSIONTYPE, 11)) { 269 if (!IS_PSTATE_ACCEPTOR(param)) { 270 pr_err("SessionType key not received" 271 " in first login request.\n"); 272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 273 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 274 return -1; 275 } 276 if (!strncmp(param->value, DISCOVERY, 9)) 277 return 0; 278 } 279 280 if (!strncmp(param->name, INITIATORNAME, 13)) { 281 if (!IS_PSTATE_ACCEPTOR(param)) { 282 if (!login->leading_connection) 283 continue; 284 285 pr_err("InitiatorName key not received" 286 " in first login request.\n"); 287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 288 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 289 return -1; 290 } 291 292 /* 293 * For non-leading connections, double check that the 294 * received InitiatorName matches the existing session's 295 * struct iscsi_node_acl. 296 */ 297 if (!login->leading_connection) { 298 se_nacl = conn->sess->se_sess->se_node_acl; 299 if (!se_nacl) { 300 pr_err("Unable to locate" 301 " struct se_node_acl\n"); 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 if (strcmp(param->value, 309 se_nacl->initiatorname)) { 310 pr_err("Incorrect" 311 " InitiatorName: %s for this" 312 " iSCSI Initiator Node.\n", 313 param->value); 314 iscsit_tx_login_rsp(conn, 315 ISCSI_STATUS_CLS_INITIATOR_ERR, 316 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 317 return -1; 318 } 319 } 320 } 321 } 322 323 return 0; 324 } 325 326 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 327 { 328 u32 padding = 0; 329 struct iscsi_login_rsp *login_rsp; 330 331 login_rsp = (struct iscsi_login_rsp *) login->rsp; 332 333 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 334 hton24(login_rsp->dlength, login->rsp_length); 335 memcpy(login_rsp->isid, login->isid, 6); 336 login_rsp->tsih = cpu_to_be16(login->tsih); 337 login_rsp->itt = login->init_task_tag; 338 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 339 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 340 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 341 342 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 343 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 344 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt, 345 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 346 ntohl(login_rsp->statsn), login->rsp_length); 347 348 padding = ((-login->rsp_length) & 3); 349 /* 350 * Before sending the last login response containing the transition 351 * bit for full-feature-phase, go ahead and start up TX/RX threads 352 * now to avoid potential resource allocation failures after the 353 * final login response has been sent. 354 */ 355 if (login->login_complete) { 356 int rc = iscsit_start_kthreads(conn); 357 if (rc) { 358 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 359 ISCSI_LOGIN_STATUS_NO_RESOURCES); 360 return -1; 361 } 362 } 363 364 if (conn->conn_transport->iscsit_put_login_tx(conn, login, 365 login->rsp_length + padding) < 0) 366 goto err; 367 368 login->rsp_length = 0; 369 370 return 0; 371 372 err: 373 if (login->login_complete) { 374 if (conn->rx_thread && conn->rx_thread_active) { 375 send_sig(SIGINT, conn->rx_thread, 1); 376 complete(&conn->rx_login_comp); 377 kthread_stop(conn->rx_thread); 378 } 379 if (conn->tx_thread && conn->tx_thread_active) { 380 send_sig(SIGINT, conn->tx_thread, 1); 381 kthread_stop(conn->tx_thread); 382 } 383 spin_lock(&iscsit_global->ts_bitmap_lock); 384 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 385 get_order(1)); 386 spin_unlock(&iscsit_global->ts_bitmap_lock); 387 } 388 return -1; 389 } 390 391 static void iscsi_target_sk_data_ready(struct sock *sk) 392 { 393 struct iscsi_conn *conn = sk->sk_user_data; 394 bool rc; 395 396 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn); 397 398 write_lock_bh(&sk->sk_callback_lock); 399 if (!sk->sk_user_data) { 400 write_unlock_bh(&sk->sk_callback_lock); 401 return; 402 } 403 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 404 write_unlock_bh(&sk->sk_callback_lock); 405 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn); 406 return; 407 } 408 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 409 write_unlock_bh(&sk->sk_callback_lock); 410 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn); 411 return; 412 } 413 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 414 write_unlock_bh(&sk->sk_callback_lock); 415 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn); 416 if (iscsi_target_sk_data_ready == conn->orig_data_ready) 417 return; 418 conn->orig_data_ready(sk); 419 return; 420 } 421 422 rc = schedule_delayed_work(&conn->login_work, 0); 423 if (!rc) { 424 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 425 " got false\n"); 426 } 427 write_unlock_bh(&sk->sk_callback_lock); 428 } 429 430 static void iscsi_target_sk_state_change(struct sock *); 431 432 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn) 433 { 434 struct sock *sk; 435 436 if (!conn->sock) 437 return; 438 439 sk = conn->sock->sk; 440 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 441 442 write_lock_bh(&sk->sk_callback_lock); 443 sk->sk_user_data = conn; 444 conn->orig_data_ready = sk->sk_data_ready; 445 conn->orig_state_change = sk->sk_state_change; 446 sk->sk_data_ready = iscsi_target_sk_data_ready; 447 sk->sk_state_change = iscsi_target_sk_state_change; 448 write_unlock_bh(&sk->sk_callback_lock); 449 450 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 451 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 452 } 453 454 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn) 455 { 456 struct sock *sk; 457 458 if (!conn->sock) 459 return; 460 461 sk = conn->sock->sk; 462 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 463 464 write_lock_bh(&sk->sk_callback_lock); 465 if (!sk->sk_user_data) { 466 write_unlock_bh(&sk->sk_callback_lock); 467 return; 468 } 469 sk->sk_user_data = NULL; 470 sk->sk_data_ready = conn->orig_data_ready; 471 sk->sk_state_change = conn->orig_state_change; 472 write_unlock_bh(&sk->sk_callback_lock); 473 474 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 475 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 476 } 477 478 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *); 479 480 static bool __iscsi_target_sk_check_close(struct sock *sk) 481 { 482 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 483 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE," 484 "returning TRUE\n"); 485 return true; 486 } 487 return false; 488 } 489 490 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn) 491 { 492 bool state = false; 493 494 if (conn->sock) { 495 struct sock *sk = conn->sock->sk; 496 497 read_lock_bh(&sk->sk_callback_lock); 498 state = (__iscsi_target_sk_check_close(sk) || 499 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 500 read_unlock_bh(&sk->sk_callback_lock); 501 } 502 return state; 503 } 504 505 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag) 506 { 507 bool state = false; 508 509 if (conn->sock) { 510 struct sock *sk = conn->sock->sk; 511 512 read_lock_bh(&sk->sk_callback_lock); 513 state = test_bit(flag, &conn->login_flags); 514 read_unlock_bh(&sk->sk_callback_lock); 515 } 516 return state; 517 } 518 519 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag) 520 { 521 bool state = false; 522 523 if (conn->sock) { 524 struct sock *sk = conn->sock->sk; 525 526 write_lock_bh(&sk->sk_callback_lock); 527 state = (__iscsi_target_sk_check_close(sk) || 528 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 529 if (!state) 530 clear_bit(flag, &conn->login_flags); 531 write_unlock_bh(&sk->sk_callback_lock); 532 } 533 return state; 534 } 535 536 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login) 537 { 538 struct iscsi_np *np = login->np; 539 bool zero_tsih = login->zero_tsih; 540 541 iscsi_remove_failed_auth_entry(conn); 542 iscsi_target_nego_release(conn); 543 iscsi_target_login_sess_out(conn, np, zero_tsih, true); 544 } 545 546 struct conn_timeout { 547 struct timer_list timer; 548 struct iscsi_conn *conn; 549 }; 550 551 static void iscsi_target_login_timeout(struct timer_list *t) 552 { 553 struct conn_timeout *timeout = from_timer(timeout, t, timer); 554 struct iscsi_conn *conn = timeout->conn; 555 556 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 557 558 if (conn->login_kworker) { 559 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 560 conn->login_kworker->comm, conn->login_kworker->pid); 561 send_sig(SIGINT, conn->login_kworker, 1); 562 } 563 } 564 565 static void iscsi_target_do_login_rx(struct work_struct *work) 566 { 567 struct iscsi_conn *conn = container_of(work, 568 struct iscsi_conn, login_work.work); 569 struct iscsi_login *login = conn->login; 570 struct iscsi_np *np = login->np; 571 struct iscsi_portal_group *tpg = conn->tpg; 572 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 573 struct conn_timeout timeout; 574 int rc, zero_tsih = login->zero_tsih; 575 bool state; 576 577 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 578 conn, current->comm, current->pid); 579 /* 580 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 581 * before initial PDU processing in iscsi_target_start_negotiation() 582 * has completed, go ahead and retry until it's cleared. 583 * 584 * Otherwise if the TCP connection drops while this is occuring, 585 * iscsi_target_start_negotiation() will detect the failure, call 586 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 587 * remaining iscsi connection resources from iscsi_np process context. 588 */ 589 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 590 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 591 return; 592 } 593 594 spin_lock(&tpg->tpg_state_lock); 595 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 596 spin_unlock(&tpg->tpg_state_lock); 597 598 if (!state) { 599 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 600 goto err; 601 } 602 603 if (iscsi_target_sk_check_close(conn)) { 604 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 605 goto err; 606 } 607 608 conn->login_kworker = current; 609 allow_signal(SIGINT); 610 611 timeout.conn = conn; 612 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0); 613 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 614 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid); 615 616 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 617 del_timer_sync(&timeout.timer); 618 destroy_timer_on_stack(&timeout.timer); 619 flush_signals(current); 620 conn->login_kworker = NULL; 621 622 if (rc < 0) 623 goto err; 624 625 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 626 conn, current->comm, current->pid); 627 628 /* 629 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready 630 * could be triggered again after this. 631 * 632 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully 633 * process a login PDU, so that sk_state_chage can do login 634 * cleanup as needed if the socket is closed. If a delayed work is 635 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE), 636 * sk_state_change will leave the cleanup to the delayed work or 637 * it will schedule a delayed work to do cleanup. 638 */ 639 if (conn->sock) { 640 struct sock *sk = conn->sock->sk; 641 642 write_lock_bh(&sk->sk_callback_lock); 643 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) { 644 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags); 645 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags); 646 } 647 write_unlock_bh(&sk->sk_callback_lock); 648 } 649 650 rc = iscsi_target_do_login(conn, login); 651 if (rc < 0) { 652 goto err; 653 } else if (!rc) { 654 if (iscsi_target_sk_check_and_clear(conn, 655 LOGIN_FLAGS_WRITE_ACTIVE)) 656 goto err; 657 } else if (rc == 1) { 658 cancel_delayed_work(&conn->login_work); 659 iscsi_target_nego_release(conn); 660 iscsi_post_login_handler(np, conn, zero_tsih); 661 iscsit_deaccess_np(np, tpg, tpg_np); 662 } 663 return; 664 665 err: 666 iscsi_target_restore_sock_callbacks(conn); 667 cancel_delayed_work(&conn->login_work); 668 iscsi_target_login_drop(conn, login); 669 iscsit_deaccess_np(np, tpg, tpg_np); 670 } 671 672 static void iscsi_target_sk_state_change(struct sock *sk) 673 { 674 struct iscsi_conn *conn; 675 void (*orig_state_change)(struct sock *); 676 bool state; 677 678 pr_debug("Entering iscsi_target_sk_state_change\n"); 679 680 write_lock_bh(&sk->sk_callback_lock); 681 conn = sk->sk_user_data; 682 if (!conn) { 683 write_unlock_bh(&sk->sk_callback_lock); 684 return; 685 } 686 orig_state_change = conn->orig_state_change; 687 688 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 689 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 690 conn); 691 write_unlock_bh(&sk->sk_callback_lock); 692 orig_state_change(sk); 693 return; 694 } 695 state = __iscsi_target_sk_check_close(sk); 696 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 697 698 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) || 699 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) { 700 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1" 701 " sk_state_change conn: %p\n", conn); 702 if (state) 703 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 704 write_unlock_bh(&sk->sk_callback_lock); 705 orig_state_change(sk); 706 return; 707 } 708 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 709 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 710 conn); 711 write_unlock_bh(&sk->sk_callback_lock); 712 orig_state_change(sk); 713 return; 714 } 715 /* 716 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 717 * but only queue conn->login_work -> iscsi_target_do_login_rx() 718 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 719 * 720 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 721 * will detect the dropped TCP connection from delayed workqueue context. 722 * 723 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 724 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 725 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 726 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 727 * dropped TCP connection in iscsi_np process context, and cleaning up 728 * the remaining iscsi connection resources. 729 */ 730 if (state) { 731 pr_debug("iscsi_target_sk_state_change got failed state\n"); 732 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 733 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 734 write_unlock_bh(&sk->sk_callback_lock); 735 736 orig_state_change(sk); 737 738 if (!state) 739 schedule_delayed_work(&conn->login_work, 0); 740 return; 741 } 742 write_unlock_bh(&sk->sk_callback_lock); 743 744 orig_state_change(sk); 745 } 746 747 /* 748 * NOTE: We check for existing sessions or connections AFTER the initiator 749 * has been successfully authenticated in order to protect against faked 750 * ISID/TSIH combinations. 751 */ 752 static int iscsi_target_check_for_existing_instances( 753 struct iscsi_conn *conn, 754 struct iscsi_login *login) 755 { 756 if (login->checked_for_existing) 757 return 0; 758 759 login->checked_for_existing = 1; 760 761 if (!login->tsih) 762 return iscsi_check_for_session_reinstatement(conn); 763 else 764 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 765 login->initial_exp_statsn); 766 } 767 768 static int iscsi_target_do_authentication( 769 struct iscsi_conn *conn, 770 struct iscsi_login *login) 771 { 772 int authret; 773 u32 payload_length; 774 struct iscsi_param *param; 775 struct iscsi_login_req *login_req; 776 struct iscsi_login_rsp *login_rsp; 777 778 login_req = (struct iscsi_login_req *) login->req; 779 login_rsp = (struct iscsi_login_rsp *) login->rsp; 780 payload_length = ntoh24(login_req->dlength); 781 782 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 783 if (!param) 784 return -1; 785 786 authret = iscsi_handle_authentication( 787 conn, 788 login->req_buf, 789 login->rsp_buf, 790 payload_length, 791 &login->rsp_length, 792 param->value); 793 switch (authret) { 794 case 0: 795 pr_debug("Received OK response" 796 " from LIO Authentication, continuing.\n"); 797 break; 798 case 1: 799 pr_debug("iSCSI security negotiation" 800 " completed successfully.\n"); 801 login->auth_complete = 1; 802 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 803 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 804 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 805 ISCSI_FLAG_LOGIN_TRANSIT); 806 login->current_stage = 1; 807 } 808 return iscsi_target_check_for_existing_instances( 809 conn, login); 810 case 2: 811 pr_err("Security negotiation" 812 " failed.\n"); 813 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 814 ISCSI_LOGIN_STATUS_AUTH_FAILED); 815 return -1; 816 default: 817 pr_err("Received unknown error %d from LIO" 818 " Authentication\n", authret); 819 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 820 ISCSI_LOGIN_STATUS_TARGET_ERROR); 821 return -1; 822 } 823 824 return 0; 825 } 826 827 static int iscsi_target_handle_csg_zero( 828 struct iscsi_conn *conn, 829 struct iscsi_login *login) 830 { 831 int ret; 832 u32 payload_length; 833 struct iscsi_param *param; 834 struct iscsi_login_req *login_req; 835 struct iscsi_login_rsp *login_rsp; 836 837 login_req = (struct iscsi_login_req *) login->req; 838 login_rsp = (struct iscsi_login_rsp *) login->rsp; 839 payload_length = ntoh24(login_req->dlength); 840 841 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 842 if (!param) 843 return -1; 844 845 ret = iscsi_decode_text_input( 846 PHASE_SECURITY|PHASE_DECLARATIVE, 847 SENDER_INITIATOR|SENDER_RECEIVER, 848 login->req_buf, 849 payload_length, 850 conn); 851 if (ret < 0) 852 return -1; 853 854 if (ret > 0) { 855 if (login->auth_complete) { 856 pr_err("Initiator has already been" 857 " successfully authenticated, but is still" 858 " sending %s keys.\n", param->value); 859 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 860 ISCSI_LOGIN_STATUS_INIT_ERR); 861 return -1; 862 } 863 864 goto do_auth; 865 } else if (!payload_length) { 866 pr_err("Initiator sent zero length security payload," 867 " login failed\n"); 868 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 869 ISCSI_LOGIN_STATUS_AUTH_FAILED); 870 return -1; 871 } 872 873 if (login->first_request) 874 if (iscsi_target_check_first_request(conn, login) < 0) 875 return -1; 876 877 ret = iscsi_encode_text_output( 878 PHASE_SECURITY|PHASE_DECLARATIVE, 879 SENDER_TARGET, 880 login->rsp_buf, 881 &login->rsp_length, 882 conn->param_list, 883 conn->tpg->tpg_attrib.login_keys_workaround); 884 if (ret < 0) 885 return -1; 886 887 if (!iscsi_check_negotiated_keys(conn->param_list)) { 888 if (conn->tpg->tpg_attrib.authentication && 889 !strncmp(param->value, NONE, 4)) { 890 pr_err("Initiator sent AuthMethod=None but" 891 " Target is enforcing iSCSI Authentication," 892 " login failed.\n"); 893 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 894 ISCSI_LOGIN_STATUS_AUTH_FAILED); 895 return -1; 896 } 897 898 if (conn->tpg->tpg_attrib.authentication && 899 !login->auth_complete) 900 return 0; 901 902 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 903 return 0; 904 905 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 906 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 907 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 908 ISCSI_FLAG_LOGIN_TRANSIT; 909 login->current_stage = 1; 910 } 911 } 912 913 return 0; 914 do_auth: 915 return iscsi_target_do_authentication(conn, login); 916 } 917 918 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 919 { 920 int ret; 921 u32 payload_length; 922 struct iscsi_login_req *login_req; 923 struct iscsi_login_rsp *login_rsp; 924 925 login_req = (struct iscsi_login_req *) login->req; 926 login_rsp = (struct iscsi_login_rsp *) login->rsp; 927 payload_length = ntoh24(login_req->dlength); 928 929 ret = iscsi_decode_text_input( 930 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 931 SENDER_INITIATOR|SENDER_RECEIVER, 932 login->req_buf, 933 payload_length, 934 conn); 935 if (ret < 0) { 936 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 937 ISCSI_LOGIN_STATUS_INIT_ERR); 938 return -1; 939 } 940 941 if (login->first_request) 942 if (iscsi_target_check_first_request(conn, login) < 0) 943 return -1; 944 945 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 946 return -1; 947 948 ret = iscsi_encode_text_output( 949 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 950 SENDER_TARGET, 951 login->rsp_buf, 952 &login->rsp_length, 953 conn->param_list, 954 conn->tpg->tpg_attrib.login_keys_workaround); 955 if (ret < 0) { 956 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 957 ISCSI_LOGIN_STATUS_INIT_ERR); 958 return -1; 959 } 960 961 if (!login->auth_complete && 962 conn->tpg->tpg_attrib.authentication) { 963 pr_err("Initiator is requesting CSG: 1, has not been" 964 " successfully authenticated, and the Target is" 965 " enforcing iSCSI Authentication, login failed.\n"); 966 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 967 ISCSI_LOGIN_STATUS_AUTH_FAILED); 968 return -1; 969 } 970 971 if (!iscsi_check_negotiated_keys(conn->param_list)) 972 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 973 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 974 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 975 ISCSI_FLAG_LOGIN_TRANSIT; 976 977 return 0; 978 } 979 980 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 981 { 982 int pdu_count = 0; 983 struct iscsi_login_req *login_req; 984 struct iscsi_login_rsp *login_rsp; 985 986 login_req = (struct iscsi_login_req *) login->req; 987 login_rsp = (struct iscsi_login_rsp *) login->rsp; 988 989 while (1) { 990 if (++pdu_count > MAX_LOGIN_PDUS) { 991 pr_err("MAX_LOGIN_PDUS count reached.\n"); 992 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 993 ISCSI_LOGIN_STATUS_TARGET_ERROR); 994 return -1; 995 } 996 997 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 998 case 0: 999 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 1000 if (iscsi_target_handle_csg_zero(conn, login) < 0) 1001 return -1; 1002 break; 1003 case 1: 1004 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 1005 if (iscsi_target_handle_csg_one(conn, login) < 0) 1006 return -1; 1007 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1008 /* 1009 * Check to make sure the TCP connection has not 1010 * dropped asynchronously while session reinstatement 1011 * was occuring in this kthread context, before 1012 * transitioning to full feature phase operation. 1013 */ 1014 if (iscsi_target_sk_check_close(conn)) 1015 return -1; 1016 1017 login->tsih = conn->sess->tsih; 1018 login->login_complete = 1; 1019 iscsi_target_restore_sock_callbacks(conn); 1020 if (iscsi_target_do_tx_login_io(conn, 1021 login) < 0) 1022 return -1; 1023 return 1; 1024 } 1025 break; 1026 default: 1027 pr_err("Illegal CSG: %d received from" 1028 " Initiator, protocol error.\n", 1029 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1030 break; 1031 } 1032 1033 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1034 return -1; 1035 1036 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1037 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1038 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1039 } 1040 break; 1041 } 1042 1043 return 0; 1044 } 1045 1046 static void iscsi_initiatorname_tolower( 1047 char *param_buf) 1048 { 1049 char *c; 1050 u32 iqn_size = strlen(param_buf), i; 1051 1052 for (i = 0; i < iqn_size; i++) { 1053 c = ¶m_buf[i]; 1054 if (!isupper(*c)) 1055 continue; 1056 1057 *c = tolower(*c); 1058 } 1059 } 1060 1061 /* 1062 * Processes the first Login Request.. 1063 */ 1064 int iscsi_target_locate_portal( 1065 struct iscsi_np *np, 1066 struct iscsi_conn *conn, 1067 struct iscsi_login *login) 1068 { 1069 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1070 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1071 struct iscsi_session *sess = conn->sess; 1072 struct iscsi_tiqn *tiqn; 1073 struct iscsi_tpg_np *tpg_np = NULL; 1074 struct iscsi_login_req *login_req; 1075 struct se_node_acl *se_nacl; 1076 u32 payload_length, queue_depth = 0; 1077 int sessiontype = 0, ret = 0, tag_num, tag_size; 1078 1079 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1080 iscsi_target_set_sock_callbacks(conn); 1081 1082 login->np = np; 1083 1084 login_req = (struct iscsi_login_req *) login->req; 1085 payload_length = ntoh24(login_req->dlength); 1086 1087 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1088 if (!tmpbuf) { 1089 pr_err("Unable to allocate memory for tmpbuf.\n"); 1090 return -1; 1091 } 1092 1093 memcpy(tmpbuf, login->req_buf, payload_length); 1094 tmpbuf[payload_length] = '\0'; 1095 start = tmpbuf; 1096 end = (start + payload_length); 1097 1098 /* 1099 * Locate the initial keys expected from the Initiator node in 1100 * the first login request in order to progress with the login phase. 1101 */ 1102 while (start < end) { 1103 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1104 ret = -1; 1105 goto out; 1106 } 1107 1108 if (!strncmp(key, "InitiatorName", 13)) 1109 i_buf = value; 1110 else if (!strncmp(key, "SessionType", 11)) 1111 s_buf = value; 1112 else if (!strncmp(key, "TargetName", 10)) 1113 t_buf = value; 1114 1115 start += strlen(key) + strlen(value) + 2; 1116 } 1117 /* 1118 * See 5.3. Login Phase. 1119 */ 1120 if (!i_buf) { 1121 pr_err("InitiatorName key not received" 1122 " in first login request.\n"); 1123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1124 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1125 ret = -1; 1126 goto out; 1127 } 1128 /* 1129 * Convert the incoming InitiatorName to lowercase following 1130 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1131 * are NOT case sensitive. 1132 */ 1133 iscsi_initiatorname_tolower(i_buf); 1134 1135 if (!s_buf) { 1136 if (!login->leading_connection) 1137 goto get_target; 1138 1139 pr_err("SessionType key not received" 1140 " in first login request.\n"); 1141 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1142 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1143 ret = -1; 1144 goto out; 1145 } 1146 1147 /* 1148 * Use default portal group for discovery sessions. 1149 */ 1150 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1151 if (!sessiontype) { 1152 conn->tpg = iscsit_global->discovery_tpg; 1153 if (!login->leading_connection) 1154 goto get_target; 1155 1156 sess->sess_ops->SessionType = 1; 1157 /* 1158 * Setup crc32c modules from libcrypto 1159 */ 1160 if (iscsi_login_setup_crypto(conn) < 0) { 1161 pr_err("iscsi_login_setup_crypto() failed\n"); 1162 ret = -1; 1163 goto out; 1164 } 1165 /* 1166 * Serialize access across the discovery struct iscsi_portal_group to 1167 * process login attempt. 1168 */ 1169 if (iscsit_access_np(np, conn->tpg) < 0) { 1170 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1171 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1172 ret = -1; 1173 goto out; 1174 } 1175 ret = 0; 1176 goto alloc_tags; 1177 } 1178 1179 get_target: 1180 if (!t_buf) { 1181 pr_err("TargetName key not received" 1182 " in first login request while" 1183 " SessionType=Normal.\n"); 1184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1185 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1186 ret = -1; 1187 goto out; 1188 } 1189 1190 /* 1191 * Locate Target IQN from Storage Node. 1192 */ 1193 tiqn = iscsit_get_tiqn_for_login(t_buf); 1194 if (!tiqn) { 1195 pr_err("Unable to locate Target IQN: %s in" 1196 " Storage Node\n", t_buf); 1197 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1198 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1199 ret = -1; 1200 goto out; 1201 } 1202 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1203 1204 /* 1205 * Locate Target Portal Group from Storage Node. 1206 */ 1207 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1208 if (!conn->tpg) { 1209 pr_err("Unable to locate Target Portal Group" 1210 " on %s\n", tiqn->tiqn); 1211 iscsit_put_tiqn_for_login(tiqn); 1212 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1213 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1214 ret = -1; 1215 goto out; 1216 } 1217 conn->tpg_np = tpg_np; 1218 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1219 /* 1220 * Setup crc32c modules from libcrypto 1221 */ 1222 if (iscsi_login_setup_crypto(conn) < 0) { 1223 pr_err("iscsi_login_setup_crypto() failed\n"); 1224 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1225 iscsit_put_tiqn_for_login(tiqn); 1226 conn->tpg = NULL; 1227 ret = -1; 1228 goto out; 1229 } 1230 /* 1231 * Serialize access across the struct iscsi_portal_group to 1232 * process login attempt. 1233 */ 1234 if (iscsit_access_np(np, conn->tpg) < 0) { 1235 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1236 iscsit_put_tiqn_for_login(tiqn); 1237 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1238 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1239 conn->tpg = NULL; 1240 ret = -1; 1241 goto out; 1242 } 1243 1244 /* 1245 * conn->sess->node_acl will be set when the referenced 1246 * struct iscsi_session is located from received ISID+TSIH in 1247 * iscsi_login_non_zero_tsih_s2(). 1248 */ 1249 if (!login->leading_connection) { 1250 ret = 0; 1251 goto out; 1252 } 1253 1254 /* 1255 * This value is required in iscsi_login_zero_tsih_s2() 1256 */ 1257 sess->sess_ops->SessionType = 0; 1258 1259 /* 1260 * Locate incoming Initiator IQN reference from Storage Node. 1261 */ 1262 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1263 &conn->tpg->tpg_se_tpg, i_buf); 1264 if (!sess->se_sess->se_node_acl) { 1265 pr_err("iSCSI Initiator Node: %s is not authorized to" 1266 " access iSCSI target portal group: %hu.\n", 1267 i_buf, conn->tpg->tpgt); 1268 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1269 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1270 ret = -1; 1271 goto out; 1272 } 1273 se_nacl = sess->se_sess->se_node_acl; 1274 queue_depth = se_nacl->queue_depth; 1275 /* 1276 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1277 * depth for non immediate commands, plus extra tags for immediate 1278 * commands. 1279 * 1280 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1281 * in per-cpu-ida tag allocation logic + small queue_depth. 1282 */ 1283 alloc_tags: 1284 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1285 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1286 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1287 1288 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1289 if (ret < 0) { 1290 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1291 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1292 ret = -1; 1293 } 1294 out: 1295 kfree(tmpbuf); 1296 return ret; 1297 } 1298 1299 int iscsi_target_start_negotiation( 1300 struct iscsi_login *login, 1301 struct iscsi_conn *conn) 1302 { 1303 int ret; 1304 1305 if (conn->sock) { 1306 struct sock *sk = conn->sock->sk; 1307 1308 write_lock_bh(&sk->sk_callback_lock); 1309 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1310 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1311 write_unlock_bh(&sk->sk_callback_lock); 1312 } 1313 /* 1314 * If iscsi_target_do_login returns zero to signal more PDU 1315 * exchanges are required to complete the login, go ahead and 1316 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1317 * is still active. 1318 * 1319 * Otherwise if TCP connection dropped asynchronously, go ahead 1320 * and perform connection cleanup now. 1321 */ 1322 ret = iscsi_target_do_login(conn, login); 1323 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1324 ret = -1; 1325 1326 if (ret < 0) { 1327 cancel_delayed_work_sync(&conn->login_work); 1328 iscsi_target_restore_sock_callbacks(conn); 1329 iscsi_remove_failed_auth_entry(conn); 1330 } 1331 if (ret != 0) 1332 iscsi_target_nego_release(conn); 1333 1334 return ret; 1335 } 1336 1337 void iscsi_target_nego_release(struct iscsi_conn *conn) 1338 { 1339 struct iscsi_login *login = conn->conn_login; 1340 1341 if (!login) 1342 return; 1343 1344 kfree(login->req_buf); 1345 kfree(login->rsp_buf); 1346 kfree(login); 1347 1348 conn->conn_login = NULL; 1349 } 1350