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 FALSE\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 rc = iscsi_target_do_login(conn, login); 629 if (rc < 0) { 630 goto err; 631 } else if (!rc) { 632 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE)) 633 goto err; 634 } else if (rc == 1) { 635 iscsi_target_nego_release(conn); 636 iscsi_post_login_handler(np, conn, zero_tsih); 637 iscsit_deaccess_np(np, tpg, tpg_np); 638 } 639 return; 640 641 err: 642 iscsi_target_restore_sock_callbacks(conn); 643 iscsi_target_login_drop(conn, login); 644 iscsit_deaccess_np(np, tpg, tpg_np); 645 } 646 647 static void iscsi_target_sk_state_change(struct sock *sk) 648 { 649 struct iscsi_conn *conn; 650 void (*orig_state_change)(struct sock *); 651 bool state; 652 653 pr_debug("Entering iscsi_target_sk_state_change\n"); 654 655 write_lock_bh(&sk->sk_callback_lock); 656 conn = sk->sk_user_data; 657 if (!conn) { 658 write_unlock_bh(&sk->sk_callback_lock); 659 return; 660 } 661 orig_state_change = conn->orig_state_change; 662 663 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 664 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 665 conn); 666 write_unlock_bh(&sk->sk_callback_lock); 667 orig_state_change(sk); 668 return; 669 } 670 state = __iscsi_target_sk_check_close(sk); 671 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 672 673 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 674 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 675 " conn: %p\n", conn); 676 if (state) 677 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 678 write_unlock_bh(&sk->sk_callback_lock); 679 orig_state_change(sk); 680 return; 681 } 682 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 683 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 684 conn); 685 write_unlock_bh(&sk->sk_callback_lock); 686 orig_state_change(sk); 687 return; 688 } 689 /* 690 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 691 * but only queue conn->login_work -> iscsi_target_do_login_rx() 692 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 693 * 694 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 695 * will detect the dropped TCP connection from delayed workqueue context. 696 * 697 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 698 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 699 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 700 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 701 * dropped TCP connection in iscsi_np process context, and cleaning up 702 * the remaining iscsi connection resources. 703 */ 704 if (state) { 705 pr_debug("iscsi_target_sk_state_change got failed state\n"); 706 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 707 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 708 write_unlock_bh(&sk->sk_callback_lock); 709 710 orig_state_change(sk); 711 712 if (!state) 713 schedule_delayed_work(&conn->login_work, 0); 714 return; 715 } 716 write_unlock_bh(&sk->sk_callback_lock); 717 718 orig_state_change(sk); 719 } 720 721 /* 722 * NOTE: We check for existing sessions or connections AFTER the initiator 723 * has been successfully authenticated in order to protect against faked 724 * ISID/TSIH combinations. 725 */ 726 static int iscsi_target_check_for_existing_instances( 727 struct iscsi_conn *conn, 728 struct iscsi_login *login) 729 { 730 if (login->checked_for_existing) 731 return 0; 732 733 login->checked_for_existing = 1; 734 735 if (!login->tsih) 736 return iscsi_check_for_session_reinstatement(conn); 737 else 738 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 739 login->initial_exp_statsn); 740 } 741 742 static int iscsi_target_do_authentication( 743 struct iscsi_conn *conn, 744 struct iscsi_login *login) 745 { 746 int authret; 747 u32 payload_length; 748 struct iscsi_param *param; 749 struct iscsi_login_req *login_req; 750 struct iscsi_login_rsp *login_rsp; 751 752 login_req = (struct iscsi_login_req *) login->req; 753 login_rsp = (struct iscsi_login_rsp *) login->rsp; 754 payload_length = ntoh24(login_req->dlength); 755 756 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 757 if (!param) 758 return -1; 759 760 authret = iscsi_handle_authentication( 761 conn, 762 login->req_buf, 763 login->rsp_buf, 764 payload_length, 765 &login->rsp_length, 766 param->value); 767 switch (authret) { 768 case 0: 769 pr_debug("Received OK response" 770 " from LIO Authentication, continuing.\n"); 771 break; 772 case 1: 773 pr_debug("iSCSI security negotiation" 774 " completed successfully.\n"); 775 login->auth_complete = 1; 776 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 777 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 778 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 779 ISCSI_FLAG_LOGIN_TRANSIT); 780 login->current_stage = 1; 781 } 782 return iscsi_target_check_for_existing_instances( 783 conn, login); 784 case 2: 785 pr_err("Security negotiation" 786 " failed.\n"); 787 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 788 ISCSI_LOGIN_STATUS_AUTH_FAILED); 789 return -1; 790 default: 791 pr_err("Received unknown error %d from LIO" 792 " Authentication\n", authret); 793 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 794 ISCSI_LOGIN_STATUS_TARGET_ERROR); 795 return -1; 796 } 797 798 return 0; 799 } 800 801 static int iscsi_target_handle_csg_zero( 802 struct iscsi_conn *conn, 803 struct iscsi_login *login) 804 { 805 int ret; 806 u32 payload_length; 807 struct iscsi_param *param; 808 struct iscsi_login_req *login_req; 809 struct iscsi_login_rsp *login_rsp; 810 811 login_req = (struct iscsi_login_req *) login->req; 812 login_rsp = (struct iscsi_login_rsp *) login->rsp; 813 payload_length = ntoh24(login_req->dlength); 814 815 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 816 if (!param) 817 return -1; 818 819 ret = iscsi_decode_text_input( 820 PHASE_SECURITY|PHASE_DECLARATIVE, 821 SENDER_INITIATOR|SENDER_RECEIVER, 822 login->req_buf, 823 payload_length, 824 conn); 825 if (ret < 0) 826 return -1; 827 828 if (ret > 0) { 829 if (login->auth_complete) { 830 pr_err("Initiator has already been" 831 " successfully authenticated, but is still" 832 " sending %s keys.\n", param->value); 833 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 834 ISCSI_LOGIN_STATUS_INIT_ERR); 835 return -1; 836 } 837 838 goto do_auth; 839 } else if (!payload_length) { 840 pr_err("Initiator sent zero length security payload," 841 " login failed\n"); 842 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 843 ISCSI_LOGIN_STATUS_AUTH_FAILED); 844 return -1; 845 } 846 847 if (login->first_request) 848 if (iscsi_target_check_first_request(conn, login) < 0) 849 return -1; 850 851 ret = iscsi_encode_text_output( 852 PHASE_SECURITY|PHASE_DECLARATIVE, 853 SENDER_TARGET, 854 login->rsp_buf, 855 &login->rsp_length, 856 conn->param_list, 857 conn->tpg->tpg_attrib.login_keys_workaround); 858 if (ret < 0) 859 return -1; 860 861 if (!iscsi_check_negotiated_keys(conn->param_list)) { 862 if (conn->tpg->tpg_attrib.authentication && 863 !strncmp(param->value, NONE, 4)) { 864 pr_err("Initiator sent AuthMethod=None but" 865 " Target is enforcing iSCSI Authentication," 866 " login failed.\n"); 867 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 868 ISCSI_LOGIN_STATUS_AUTH_FAILED); 869 return -1; 870 } 871 872 if (conn->tpg->tpg_attrib.authentication && 873 !login->auth_complete) 874 return 0; 875 876 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 877 return 0; 878 879 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 880 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 881 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 882 ISCSI_FLAG_LOGIN_TRANSIT; 883 login->current_stage = 1; 884 } 885 } 886 887 return 0; 888 do_auth: 889 return iscsi_target_do_authentication(conn, login); 890 } 891 892 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 893 { 894 int ret; 895 u32 payload_length; 896 struct iscsi_login_req *login_req; 897 struct iscsi_login_rsp *login_rsp; 898 899 login_req = (struct iscsi_login_req *) login->req; 900 login_rsp = (struct iscsi_login_rsp *) login->rsp; 901 payload_length = ntoh24(login_req->dlength); 902 903 ret = iscsi_decode_text_input( 904 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 905 SENDER_INITIATOR|SENDER_RECEIVER, 906 login->req_buf, 907 payload_length, 908 conn); 909 if (ret < 0) { 910 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 911 ISCSI_LOGIN_STATUS_INIT_ERR); 912 return -1; 913 } 914 915 if (login->first_request) 916 if (iscsi_target_check_first_request(conn, login) < 0) 917 return -1; 918 919 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 920 return -1; 921 922 ret = iscsi_encode_text_output( 923 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 924 SENDER_TARGET, 925 login->rsp_buf, 926 &login->rsp_length, 927 conn->param_list, 928 conn->tpg->tpg_attrib.login_keys_workaround); 929 if (ret < 0) { 930 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 931 ISCSI_LOGIN_STATUS_INIT_ERR); 932 return -1; 933 } 934 935 if (!login->auth_complete && 936 conn->tpg->tpg_attrib.authentication) { 937 pr_err("Initiator is requesting CSG: 1, has not been" 938 " successfully authenticated, and the Target is" 939 " enforcing iSCSI Authentication, login failed.\n"); 940 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 941 ISCSI_LOGIN_STATUS_AUTH_FAILED); 942 return -1; 943 } 944 945 if (!iscsi_check_negotiated_keys(conn->param_list)) 946 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 947 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 948 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 949 ISCSI_FLAG_LOGIN_TRANSIT; 950 951 return 0; 952 } 953 954 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 955 { 956 int pdu_count = 0; 957 struct iscsi_login_req *login_req; 958 struct iscsi_login_rsp *login_rsp; 959 960 login_req = (struct iscsi_login_req *) login->req; 961 login_rsp = (struct iscsi_login_rsp *) login->rsp; 962 963 while (1) { 964 if (++pdu_count > MAX_LOGIN_PDUS) { 965 pr_err("MAX_LOGIN_PDUS count reached.\n"); 966 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 967 ISCSI_LOGIN_STATUS_TARGET_ERROR); 968 return -1; 969 } 970 971 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 972 case 0: 973 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 974 if (iscsi_target_handle_csg_zero(conn, login) < 0) 975 return -1; 976 break; 977 case 1: 978 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 979 if (iscsi_target_handle_csg_one(conn, login) < 0) 980 return -1; 981 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 982 /* 983 * Check to make sure the TCP connection has not 984 * dropped asynchronously while session reinstatement 985 * was occuring in this kthread context, before 986 * transitioning to full feature phase operation. 987 */ 988 if (iscsi_target_sk_check_close(conn)) 989 return -1; 990 991 login->tsih = conn->sess->tsih; 992 login->login_complete = 1; 993 iscsi_target_restore_sock_callbacks(conn); 994 if (iscsi_target_do_tx_login_io(conn, 995 login) < 0) 996 return -1; 997 return 1; 998 } 999 break; 1000 default: 1001 pr_err("Illegal CSG: %d received from" 1002 " Initiator, protocol error.\n", 1003 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1004 break; 1005 } 1006 1007 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1008 return -1; 1009 1010 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1011 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1012 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1013 } 1014 break; 1015 } 1016 1017 return 0; 1018 } 1019 1020 static void iscsi_initiatorname_tolower( 1021 char *param_buf) 1022 { 1023 char *c; 1024 u32 iqn_size = strlen(param_buf), i; 1025 1026 for (i = 0; i < iqn_size; i++) { 1027 c = ¶m_buf[i]; 1028 if (!isupper(*c)) 1029 continue; 1030 1031 *c = tolower(*c); 1032 } 1033 } 1034 1035 /* 1036 * Processes the first Login Request.. 1037 */ 1038 int iscsi_target_locate_portal( 1039 struct iscsi_np *np, 1040 struct iscsi_conn *conn, 1041 struct iscsi_login *login) 1042 { 1043 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1044 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1045 struct iscsi_session *sess = conn->sess; 1046 struct iscsi_tiqn *tiqn; 1047 struct iscsi_tpg_np *tpg_np = NULL; 1048 struct iscsi_login_req *login_req; 1049 struct se_node_acl *se_nacl; 1050 u32 payload_length, queue_depth = 0; 1051 int sessiontype = 0, ret = 0, tag_num, tag_size; 1052 1053 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1054 iscsi_target_set_sock_callbacks(conn); 1055 1056 login->np = np; 1057 1058 login_req = (struct iscsi_login_req *) login->req; 1059 payload_length = ntoh24(login_req->dlength); 1060 1061 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1062 if (!tmpbuf) { 1063 pr_err("Unable to allocate memory for tmpbuf.\n"); 1064 return -1; 1065 } 1066 1067 memcpy(tmpbuf, login->req_buf, payload_length); 1068 tmpbuf[payload_length] = '\0'; 1069 start = tmpbuf; 1070 end = (start + payload_length); 1071 1072 /* 1073 * Locate the initial keys expected from the Initiator node in 1074 * the first login request in order to progress with the login phase. 1075 */ 1076 while (start < end) { 1077 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1078 ret = -1; 1079 goto out; 1080 } 1081 1082 if (!strncmp(key, "InitiatorName", 13)) 1083 i_buf = value; 1084 else if (!strncmp(key, "SessionType", 11)) 1085 s_buf = value; 1086 else if (!strncmp(key, "TargetName", 10)) 1087 t_buf = value; 1088 1089 start += strlen(key) + strlen(value) + 2; 1090 } 1091 /* 1092 * See 5.3. Login Phase. 1093 */ 1094 if (!i_buf) { 1095 pr_err("InitiatorName key not received" 1096 " in first login request.\n"); 1097 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1098 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1099 ret = -1; 1100 goto out; 1101 } 1102 /* 1103 * Convert the incoming InitiatorName to lowercase following 1104 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1105 * are NOT case sensitive. 1106 */ 1107 iscsi_initiatorname_tolower(i_buf); 1108 1109 if (!s_buf) { 1110 if (!login->leading_connection) 1111 goto get_target; 1112 1113 pr_err("SessionType key not received" 1114 " in first login request.\n"); 1115 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1116 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1117 ret = -1; 1118 goto out; 1119 } 1120 1121 /* 1122 * Use default portal group for discovery sessions. 1123 */ 1124 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1125 if (!sessiontype) { 1126 conn->tpg = iscsit_global->discovery_tpg; 1127 if (!login->leading_connection) 1128 goto get_target; 1129 1130 sess->sess_ops->SessionType = 1; 1131 /* 1132 * Setup crc32c modules from libcrypto 1133 */ 1134 if (iscsi_login_setup_crypto(conn) < 0) { 1135 pr_err("iscsi_login_setup_crypto() failed\n"); 1136 ret = -1; 1137 goto out; 1138 } 1139 /* 1140 * Serialize access across the discovery struct iscsi_portal_group to 1141 * process login attempt. 1142 */ 1143 if (iscsit_access_np(np, conn->tpg) < 0) { 1144 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1145 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1146 ret = -1; 1147 goto out; 1148 } 1149 ret = 0; 1150 goto alloc_tags; 1151 } 1152 1153 get_target: 1154 if (!t_buf) { 1155 pr_err("TargetName key not received" 1156 " in first login request while" 1157 " SessionType=Normal.\n"); 1158 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1159 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1160 ret = -1; 1161 goto out; 1162 } 1163 1164 /* 1165 * Locate Target IQN from Storage Node. 1166 */ 1167 tiqn = iscsit_get_tiqn_for_login(t_buf); 1168 if (!tiqn) { 1169 pr_err("Unable to locate Target IQN: %s in" 1170 " Storage Node\n", t_buf); 1171 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1172 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1173 ret = -1; 1174 goto out; 1175 } 1176 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1177 1178 /* 1179 * Locate Target Portal Group from Storage Node. 1180 */ 1181 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1182 if (!conn->tpg) { 1183 pr_err("Unable to locate Target Portal Group" 1184 " on %s\n", tiqn->tiqn); 1185 iscsit_put_tiqn_for_login(tiqn); 1186 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1187 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1188 ret = -1; 1189 goto out; 1190 } 1191 conn->tpg_np = tpg_np; 1192 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 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 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1199 iscsit_put_tiqn_for_login(tiqn); 1200 conn->tpg = NULL; 1201 ret = -1; 1202 goto out; 1203 } 1204 /* 1205 * Serialize access across the struct iscsi_portal_group to 1206 * process login attempt. 1207 */ 1208 if (iscsit_access_np(np, conn->tpg) < 0) { 1209 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1210 iscsit_put_tiqn_for_login(tiqn); 1211 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1212 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1213 conn->tpg = NULL; 1214 ret = -1; 1215 goto out; 1216 } 1217 1218 /* 1219 * conn->sess->node_acl will be set when the referenced 1220 * struct iscsi_session is located from received ISID+TSIH in 1221 * iscsi_login_non_zero_tsih_s2(). 1222 */ 1223 if (!login->leading_connection) { 1224 ret = 0; 1225 goto out; 1226 } 1227 1228 /* 1229 * This value is required in iscsi_login_zero_tsih_s2() 1230 */ 1231 sess->sess_ops->SessionType = 0; 1232 1233 /* 1234 * Locate incoming Initiator IQN reference from Storage Node. 1235 */ 1236 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1237 &conn->tpg->tpg_se_tpg, i_buf); 1238 if (!sess->se_sess->se_node_acl) { 1239 pr_err("iSCSI Initiator Node: %s is not authorized to" 1240 " access iSCSI target portal group: %hu.\n", 1241 i_buf, conn->tpg->tpgt); 1242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1243 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1244 ret = -1; 1245 goto out; 1246 } 1247 se_nacl = sess->se_sess->se_node_acl; 1248 queue_depth = se_nacl->queue_depth; 1249 /* 1250 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1251 * depth for non immediate commands, plus extra tags for immediate 1252 * commands. 1253 * 1254 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1255 * in per-cpu-ida tag allocation logic + small queue_depth. 1256 */ 1257 alloc_tags: 1258 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1259 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1260 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1261 1262 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1263 if (ret < 0) { 1264 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1265 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1266 ret = -1; 1267 } 1268 out: 1269 kfree(tmpbuf); 1270 return ret; 1271 } 1272 1273 int iscsi_target_start_negotiation( 1274 struct iscsi_login *login, 1275 struct iscsi_conn *conn) 1276 { 1277 int ret; 1278 1279 if (conn->sock) { 1280 struct sock *sk = conn->sock->sk; 1281 1282 write_lock_bh(&sk->sk_callback_lock); 1283 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1284 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1285 write_unlock_bh(&sk->sk_callback_lock); 1286 } 1287 /* 1288 * If iscsi_target_do_login returns zero to signal more PDU 1289 * exchanges are required to complete the login, go ahead and 1290 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1291 * is still active. 1292 * 1293 * Otherwise if TCP connection dropped asynchronously, go ahead 1294 * and perform connection cleanup now. 1295 */ 1296 ret = iscsi_target_do_login(conn, login); 1297 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1298 ret = -1; 1299 1300 if (ret < 0) { 1301 cancel_delayed_work_sync(&conn->login_work); 1302 iscsi_target_restore_sock_callbacks(conn); 1303 iscsi_remove_failed_auth_entry(conn); 1304 } 1305 if (ret != 0) 1306 iscsi_target_nego_release(conn); 1307 1308 return ret; 1309 } 1310 1311 void iscsi_target_nego_release(struct iscsi_conn *conn) 1312 { 1313 struct iscsi_login *login = conn->conn_login; 1314 1315 if (!login) 1316 return; 1317 1318 kfree(login->req_buf); 1319 kfree(login->rsp_buf); 1320 kfree(login); 1321 1322 conn->conn_login = NULL; 1323 } 1324