1 /******************************************************************************* 2 * This file contains main functions related to iSCSI Parameter negotiation. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19 #include <linux/ctype.h> 20 #include <linux/kthread.h> 21 #include <linux/slab.h> 22 #include <linux/sched/signal.h> 23 #include <net/sock.h> 24 #include <scsi/iscsi_proto.h> 25 #include <target/target_core_base.h> 26 #include <target/target_core_fabric.h> 27 #include <target/iscsi/iscsi_transport.h> 28 29 #include <target/iscsi/iscsi_target_core.h> 30 #include "iscsi_target_parameters.h" 31 #include "iscsi_target_login.h" 32 #include "iscsi_target_nego.h" 33 #include "iscsi_target_tpg.h" 34 #include "iscsi_target_util.h" 35 #include "iscsi_target.h" 36 #include "iscsi_target_auth.h" 37 38 #define MAX_LOGIN_PDUS 7 39 #define TEXT_LEN 4096 40 41 void convert_null_to_semi(char *buf, int len) 42 { 43 int i; 44 45 for (i = 0; i < len; i++) 46 if (buf[i] == '\0') 47 buf[i] = ';'; 48 } 49 50 static int strlen_semi(char *buf) 51 { 52 int i = 0; 53 54 while (buf[i] != '\0') { 55 if (buf[i] == ';') 56 return i; 57 i++; 58 } 59 60 return -1; 61 } 62 63 int extract_param( 64 const char *in_buf, 65 const char *pattern, 66 unsigned int max_length, 67 char *out_buf, 68 unsigned char *type) 69 { 70 char *ptr; 71 int len; 72 73 if (!in_buf || !pattern || !out_buf || !type) 74 return -1; 75 76 ptr = strstr(in_buf, pattern); 77 if (!ptr) 78 return -1; 79 80 ptr = strstr(ptr, "="); 81 if (!ptr) 82 return -1; 83 84 ptr += 1; 85 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 86 ptr += 2; /* skip 0x */ 87 *type = HEX; 88 } else 89 *type = DECIMAL; 90 91 len = strlen_semi(ptr); 92 if (len < 0) 93 return -1; 94 95 if (len >= max_length) { 96 pr_err("Length of input: %d exceeds max_length:" 97 " %d\n", len, max_length); 98 return -1; 99 } 100 memcpy(out_buf, ptr, len); 101 out_buf[len] = '\0'; 102 103 return 0; 104 } 105 106 static u32 iscsi_handle_authentication( 107 struct iscsi_conn *conn, 108 char *in_buf, 109 char *out_buf, 110 int in_length, 111 int *out_length, 112 unsigned char *authtype) 113 { 114 struct iscsi_session *sess = conn->sess; 115 struct iscsi_node_auth *auth; 116 struct iscsi_node_acl *iscsi_nacl; 117 struct iscsi_portal_group *iscsi_tpg; 118 struct se_node_acl *se_nacl; 119 120 if (!sess->sess_ops->SessionType) { 121 /* 122 * For SessionType=Normal 123 */ 124 se_nacl = conn->sess->se_sess->se_node_acl; 125 if (!se_nacl) { 126 pr_err("Unable to locate struct se_node_acl for" 127 " CHAP auth\n"); 128 return -1; 129 } 130 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 131 se_node_acl); 132 if (!iscsi_nacl) { 133 pr_err("Unable to locate struct iscsi_node_acl for" 134 " CHAP auth\n"); 135 return -1; 136 } 137 138 if (se_nacl->dynamic_node_acl) { 139 iscsi_tpg = container_of(se_nacl->se_tpg, 140 struct iscsi_portal_group, tpg_se_tpg); 141 142 auth = &iscsi_tpg->tpg_demo_auth; 143 } else { 144 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 145 se_node_acl); 146 147 auth = &iscsi_nacl->node_auth; 148 } 149 } else { 150 /* 151 * For SessionType=Discovery 152 */ 153 auth = &iscsit_global->discovery_acl.node_auth; 154 } 155 156 if (strstr("CHAP", authtype)) 157 strcpy(conn->sess->auth_type, "CHAP"); 158 else 159 strcpy(conn->sess->auth_type, NONE); 160 161 if (strstr("None", authtype)) 162 return 1; 163 #ifdef CANSRP 164 else if (strstr("SRP", authtype)) 165 return srp_main_loop(conn, auth, in_buf, out_buf, 166 &in_length, out_length); 167 #endif 168 else if (strstr("CHAP", authtype)) 169 return chap_main_loop(conn, auth, in_buf, out_buf, 170 &in_length, out_length); 171 else if (strstr("SPKM1", authtype)) 172 return 2; 173 else if (strstr("SPKM2", authtype)) 174 return 2; 175 else if (strstr("KRB5", authtype)) 176 return 2; 177 else 178 return 2; 179 } 180 181 static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 182 { 183 kfree(conn->auth_protocol); 184 } 185 186 int iscsi_target_check_login_request( 187 struct iscsi_conn *conn, 188 struct iscsi_login *login) 189 { 190 int req_csg, req_nsg; 191 u32 payload_length; 192 struct iscsi_login_req *login_req; 193 194 login_req = (struct iscsi_login_req *) login->req; 195 payload_length = ntoh24(login_req->dlength); 196 197 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 198 case ISCSI_OP_LOGIN: 199 break; 200 default: 201 pr_err("Received unknown opcode 0x%02x.\n", 202 login_req->opcode & ISCSI_OPCODE_MASK); 203 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 204 ISCSI_LOGIN_STATUS_INIT_ERR); 205 return -1; 206 } 207 208 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 209 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 210 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 211 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 212 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 213 ISCSI_LOGIN_STATUS_INIT_ERR); 214 return -1; 215 } 216 217 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 218 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags); 219 220 if (req_csg != login->current_stage) { 221 pr_err("Initiator unexpectedly changed login stage" 222 " from %d to %d, login failed.\n", login->current_stage, 223 req_csg); 224 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 225 ISCSI_LOGIN_STATUS_INIT_ERR); 226 return -1; 227 } 228 229 if ((req_nsg == 2) || (req_csg >= 2) || 230 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 231 (req_nsg <= req_csg))) { 232 pr_err("Illegal login_req->flags Combination, CSG: %d," 233 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 234 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 235 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 236 ISCSI_LOGIN_STATUS_INIT_ERR); 237 return -1; 238 } 239 240 if ((login_req->max_version != login->version_max) || 241 (login_req->min_version != login->version_min)) { 242 pr_err("Login request changed Version Max/Nin" 243 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 244 login_req->max_version, login_req->min_version); 245 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 246 ISCSI_LOGIN_STATUS_INIT_ERR); 247 return -1; 248 } 249 250 if (memcmp(login_req->isid, login->isid, 6) != 0) { 251 pr_err("Login request changed ISID unexpectedly," 252 " protocol error.\n"); 253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 254 ISCSI_LOGIN_STATUS_INIT_ERR); 255 return -1; 256 } 257 258 if (login_req->itt != login->init_task_tag) { 259 pr_err("Login request changed ITT unexpectedly to" 260 " 0x%08x, protocol error.\n", login_req->itt); 261 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 262 ISCSI_LOGIN_STATUS_INIT_ERR); 263 return -1; 264 } 265 266 if (payload_length > MAX_KEY_VALUE_PAIRS) { 267 pr_err("Login request payload exceeds default" 268 " MaxRecvDataSegmentLength: %u, protocol error.\n", 269 MAX_KEY_VALUE_PAIRS); 270 return -1; 271 } 272 273 return 0; 274 } 275 EXPORT_SYMBOL(iscsi_target_check_login_request); 276 277 static int iscsi_target_check_first_request( 278 struct iscsi_conn *conn, 279 struct iscsi_login *login) 280 { 281 struct iscsi_param *param = NULL; 282 struct se_node_acl *se_nacl; 283 284 login->first_request = 0; 285 286 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 287 if (!strncmp(param->name, SESSIONTYPE, 11)) { 288 if (!IS_PSTATE_ACCEPTOR(param)) { 289 pr_err("SessionType key not received" 290 " in first login request.\n"); 291 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 292 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 293 return -1; 294 } 295 if (!strncmp(param->value, DISCOVERY, 9)) 296 return 0; 297 } 298 299 if (!strncmp(param->name, INITIATORNAME, 13)) { 300 if (!IS_PSTATE_ACCEPTOR(param)) { 301 if (!login->leading_connection) 302 continue; 303 304 pr_err("InitiatorName key not received" 305 " in first login request.\n"); 306 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 307 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 308 return -1; 309 } 310 311 /* 312 * For non-leading connections, double check that the 313 * received InitiatorName matches the existing session's 314 * struct iscsi_node_acl. 315 */ 316 if (!login->leading_connection) { 317 se_nacl = conn->sess->se_sess->se_node_acl; 318 if (!se_nacl) { 319 pr_err("Unable to locate" 320 " struct se_node_acl\n"); 321 iscsit_tx_login_rsp(conn, 322 ISCSI_STATUS_CLS_INITIATOR_ERR, 323 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 324 return -1; 325 } 326 327 if (strcmp(param->value, 328 se_nacl->initiatorname)) { 329 pr_err("Incorrect" 330 " InitiatorName: %s for this" 331 " iSCSI Initiator Node.\n", 332 param->value); 333 iscsit_tx_login_rsp(conn, 334 ISCSI_STATUS_CLS_INITIATOR_ERR, 335 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 336 return -1; 337 } 338 } 339 } 340 } 341 342 return 0; 343 } 344 345 static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 346 { 347 u32 padding = 0; 348 struct iscsi_login_rsp *login_rsp; 349 350 login_rsp = (struct iscsi_login_rsp *) login->rsp; 351 352 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 353 hton24(login_rsp->dlength, login->rsp_length); 354 memcpy(login_rsp->isid, login->isid, 6); 355 login_rsp->tsih = cpu_to_be16(login->tsih); 356 login_rsp->itt = login->init_task_tag; 357 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 358 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 359 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 360 361 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 362 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 363 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt, 364 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 365 ntohl(login_rsp->statsn), login->rsp_length); 366 367 padding = ((-login->rsp_length) & 3); 368 /* 369 * Before sending the last login response containing the transition 370 * bit for full-feature-phase, go ahead and start up TX/RX threads 371 * now to avoid potential resource allocation failures after the 372 * final login response has been sent. 373 */ 374 if (login->login_complete) { 375 int rc = iscsit_start_kthreads(conn); 376 if (rc) { 377 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 378 ISCSI_LOGIN_STATUS_NO_RESOURCES); 379 return -1; 380 } 381 } 382 383 if (conn->conn_transport->iscsit_put_login_tx(conn, login, 384 login->rsp_length + padding) < 0) 385 goto err; 386 387 login->rsp_length = 0; 388 389 return 0; 390 391 err: 392 if (login->login_complete) { 393 if (conn->rx_thread && conn->rx_thread_active) { 394 send_sig(SIGINT, conn->rx_thread, 1); 395 complete(&conn->rx_login_comp); 396 kthread_stop(conn->rx_thread); 397 } 398 if (conn->tx_thread && conn->tx_thread_active) { 399 send_sig(SIGINT, conn->tx_thread, 1); 400 kthread_stop(conn->tx_thread); 401 } 402 spin_lock(&iscsit_global->ts_bitmap_lock); 403 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 404 get_order(1)); 405 spin_unlock(&iscsit_global->ts_bitmap_lock); 406 } 407 return -1; 408 } 409 410 static void iscsi_target_sk_data_ready(struct sock *sk) 411 { 412 struct iscsi_conn *conn = sk->sk_user_data; 413 bool rc; 414 415 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn); 416 417 write_lock_bh(&sk->sk_callback_lock); 418 if (!sk->sk_user_data) { 419 write_unlock_bh(&sk->sk_callback_lock); 420 return; 421 } 422 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 423 write_unlock_bh(&sk->sk_callback_lock); 424 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn); 425 return; 426 } 427 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 428 write_unlock_bh(&sk->sk_callback_lock); 429 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn); 430 return; 431 } 432 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 433 write_unlock_bh(&sk->sk_callback_lock); 434 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn); 435 return; 436 } 437 438 rc = schedule_delayed_work(&conn->login_work, 0); 439 if (!rc) { 440 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 441 " got false\n"); 442 } 443 write_unlock_bh(&sk->sk_callback_lock); 444 } 445 446 static void iscsi_target_sk_state_change(struct sock *); 447 448 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn) 449 { 450 struct sock *sk; 451 452 if (!conn->sock) 453 return; 454 455 sk = conn->sock->sk; 456 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 457 458 write_lock_bh(&sk->sk_callback_lock); 459 sk->sk_user_data = conn; 460 conn->orig_data_ready = sk->sk_data_ready; 461 conn->orig_state_change = sk->sk_state_change; 462 sk->sk_data_ready = iscsi_target_sk_data_ready; 463 sk->sk_state_change = iscsi_target_sk_state_change; 464 write_unlock_bh(&sk->sk_callback_lock); 465 466 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 467 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 468 } 469 470 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn) 471 { 472 struct sock *sk; 473 474 if (!conn->sock) 475 return; 476 477 sk = conn->sock->sk; 478 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 479 480 write_lock_bh(&sk->sk_callback_lock); 481 if (!sk->sk_user_data) { 482 write_unlock_bh(&sk->sk_callback_lock); 483 return; 484 } 485 sk->sk_user_data = NULL; 486 sk->sk_data_ready = conn->orig_data_ready; 487 sk->sk_state_change = conn->orig_state_change; 488 write_unlock_bh(&sk->sk_callback_lock); 489 490 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 491 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 492 } 493 494 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *); 495 496 static bool __iscsi_target_sk_check_close(struct sock *sk) 497 { 498 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 499 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE," 500 "returning FALSE\n"); 501 return true; 502 } 503 return false; 504 } 505 506 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn) 507 { 508 bool state = false; 509 510 if (conn->sock) { 511 struct sock *sk = conn->sock->sk; 512 513 read_lock_bh(&sk->sk_callback_lock); 514 state = (__iscsi_target_sk_check_close(sk) || 515 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 516 read_unlock_bh(&sk->sk_callback_lock); 517 } 518 return state; 519 } 520 521 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag) 522 { 523 bool state = false; 524 525 if (conn->sock) { 526 struct sock *sk = conn->sock->sk; 527 528 read_lock_bh(&sk->sk_callback_lock); 529 state = test_bit(flag, &conn->login_flags); 530 read_unlock_bh(&sk->sk_callback_lock); 531 } 532 return state; 533 } 534 535 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag) 536 { 537 bool state = false; 538 539 if (conn->sock) { 540 struct sock *sk = conn->sock->sk; 541 542 write_lock_bh(&sk->sk_callback_lock); 543 state = (__iscsi_target_sk_check_close(sk) || 544 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 545 if (!state) 546 clear_bit(flag, &conn->login_flags); 547 write_unlock_bh(&sk->sk_callback_lock); 548 } 549 return state; 550 } 551 552 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login) 553 { 554 struct iscsi_np *np = login->np; 555 bool zero_tsih = login->zero_tsih; 556 557 iscsi_remove_failed_auth_entry(conn); 558 iscsi_target_nego_release(conn); 559 iscsi_target_login_sess_out(conn, np, zero_tsih, true); 560 } 561 562 static void iscsi_target_login_timeout(unsigned long data) 563 { 564 struct iscsi_conn *conn = (struct iscsi_conn *)data; 565 566 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 567 568 if (conn->login_kworker) { 569 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 570 conn->login_kworker->comm, conn->login_kworker->pid); 571 send_sig(SIGINT, conn->login_kworker, 1); 572 } 573 } 574 575 static void iscsi_target_do_login_rx(struct work_struct *work) 576 { 577 struct iscsi_conn *conn = container_of(work, 578 struct iscsi_conn, login_work.work); 579 struct iscsi_login *login = conn->login; 580 struct iscsi_np *np = login->np; 581 struct iscsi_portal_group *tpg = conn->tpg; 582 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 583 struct timer_list login_timer; 584 int rc, zero_tsih = login->zero_tsih; 585 bool state; 586 587 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 588 conn, current->comm, current->pid); 589 /* 590 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 591 * before initial PDU processing in iscsi_target_start_negotiation() 592 * has completed, go ahead and retry until it's cleared. 593 * 594 * Otherwise if the TCP connection drops while this is occuring, 595 * iscsi_target_start_negotiation() will detect the failure, call 596 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 597 * remaining iscsi connection resources from iscsi_np process context. 598 */ 599 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 600 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 601 return; 602 } 603 604 spin_lock(&tpg->tpg_state_lock); 605 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 606 spin_unlock(&tpg->tpg_state_lock); 607 608 if (!state) { 609 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 610 goto err; 611 } 612 613 if (iscsi_target_sk_check_close(conn)) { 614 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 615 goto err; 616 } 617 618 conn->login_kworker = current; 619 allow_signal(SIGINT); 620 621 init_timer(&login_timer); 622 login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ); 623 login_timer.data = (unsigned long)conn; 624 login_timer.function = iscsi_target_login_timeout; 625 add_timer(&login_timer); 626 pr_debug("Starting login_timer for %s/%d\n", current->comm, current->pid); 627 628 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 629 del_timer_sync(&login_timer); 630 flush_signals(current); 631 conn->login_kworker = NULL; 632 633 if (rc < 0) 634 goto err; 635 636 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 637 conn, current->comm, current->pid); 638 639 rc = iscsi_target_do_login(conn, login); 640 if (rc < 0) { 641 goto err; 642 } else if (!rc) { 643 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE)) 644 goto err; 645 } else if (rc == 1) { 646 iscsi_target_nego_release(conn); 647 iscsi_post_login_handler(np, conn, zero_tsih); 648 iscsit_deaccess_np(np, tpg, tpg_np); 649 } 650 return; 651 652 err: 653 iscsi_target_restore_sock_callbacks(conn); 654 iscsi_target_login_drop(conn, login); 655 iscsit_deaccess_np(np, tpg, tpg_np); 656 } 657 658 static void iscsi_target_do_cleanup(struct work_struct *work) 659 { 660 struct iscsi_conn *conn = container_of(work, 661 struct iscsi_conn, login_cleanup_work.work); 662 struct sock *sk = conn->sock->sk; 663 struct iscsi_login *login = conn->login; 664 struct iscsi_np *np = login->np; 665 struct iscsi_portal_group *tpg = conn->tpg; 666 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 667 668 pr_debug("Entering iscsi_target_do_cleanup\n"); 669 670 cancel_delayed_work_sync(&conn->login_work); 671 conn->orig_state_change(sk); 672 673 iscsi_target_restore_sock_callbacks(conn); 674 iscsi_target_login_drop(conn, login); 675 iscsit_deaccess_np(np, tpg, tpg_np); 676 677 pr_debug("iscsi_target_do_cleanup done()\n"); 678 } 679 680 static void iscsi_target_sk_state_change(struct sock *sk) 681 { 682 struct iscsi_conn *conn; 683 void (*orig_state_change)(struct sock *); 684 bool state; 685 686 pr_debug("Entering iscsi_target_sk_state_change\n"); 687 688 write_lock_bh(&sk->sk_callback_lock); 689 conn = sk->sk_user_data; 690 if (!conn) { 691 write_unlock_bh(&sk->sk_callback_lock); 692 return; 693 } 694 orig_state_change = conn->orig_state_change; 695 696 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 697 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 698 conn); 699 write_unlock_bh(&sk->sk_callback_lock); 700 orig_state_change(sk); 701 return; 702 } 703 state = __iscsi_target_sk_check_close(sk); 704 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 705 706 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 707 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 708 " conn: %p\n", conn); 709 if (state) 710 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 711 write_unlock_bh(&sk->sk_callback_lock); 712 orig_state_change(sk); 713 return; 714 } 715 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 716 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 717 conn); 718 write_unlock_bh(&sk->sk_callback_lock); 719 orig_state_change(sk); 720 return; 721 } 722 /* 723 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 724 * but only queue conn->login_work -> iscsi_target_do_login_rx() 725 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 726 * 727 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 728 * will detect the dropped TCP connection from delayed workqueue context. 729 * 730 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 731 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 732 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 733 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 734 * dropped TCP connection in iscsi_np process context, and cleaning up 735 * the remaining iscsi connection resources. 736 */ 737 if (state) { 738 pr_debug("iscsi_target_sk_state_change got failed state\n"); 739 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 740 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 741 write_unlock_bh(&sk->sk_callback_lock); 742 743 orig_state_change(sk); 744 745 if (!state) 746 schedule_delayed_work(&conn->login_work, 0); 747 return; 748 } 749 write_unlock_bh(&sk->sk_callback_lock); 750 751 orig_state_change(sk); 752 } 753 754 /* 755 * NOTE: We check for existing sessions or connections AFTER the initiator 756 * has been successfully authenticated in order to protect against faked 757 * ISID/TSIH combinations. 758 */ 759 static int iscsi_target_check_for_existing_instances( 760 struct iscsi_conn *conn, 761 struct iscsi_login *login) 762 { 763 if (login->checked_for_existing) 764 return 0; 765 766 login->checked_for_existing = 1; 767 768 if (!login->tsih) 769 return iscsi_check_for_session_reinstatement(conn); 770 else 771 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 772 login->initial_exp_statsn); 773 } 774 775 static int iscsi_target_do_authentication( 776 struct iscsi_conn *conn, 777 struct iscsi_login *login) 778 { 779 int authret; 780 u32 payload_length; 781 struct iscsi_param *param; 782 struct iscsi_login_req *login_req; 783 struct iscsi_login_rsp *login_rsp; 784 785 login_req = (struct iscsi_login_req *) login->req; 786 login_rsp = (struct iscsi_login_rsp *) login->rsp; 787 payload_length = ntoh24(login_req->dlength); 788 789 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 790 if (!param) 791 return -1; 792 793 authret = iscsi_handle_authentication( 794 conn, 795 login->req_buf, 796 login->rsp_buf, 797 payload_length, 798 &login->rsp_length, 799 param->value); 800 switch (authret) { 801 case 0: 802 pr_debug("Received OK response" 803 " from LIO Authentication, continuing.\n"); 804 break; 805 case 1: 806 pr_debug("iSCSI security negotiation" 807 " completed successfully.\n"); 808 login->auth_complete = 1; 809 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 810 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 811 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 812 ISCSI_FLAG_LOGIN_TRANSIT); 813 login->current_stage = 1; 814 } 815 return iscsi_target_check_for_existing_instances( 816 conn, login); 817 case 2: 818 pr_err("Security negotiation" 819 " failed.\n"); 820 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 821 ISCSI_LOGIN_STATUS_AUTH_FAILED); 822 return -1; 823 default: 824 pr_err("Received unknown error %d from LIO" 825 " Authentication\n", authret); 826 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 827 ISCSI_LOGIN_STATUS_TARGET_ERROR); 828 return -1; 829 } 830 831 return 0; 832 } 833 834 static int iscsi_target_handle_csg_zero( 835 struct iscsi_conn *conn, 836 struct iscsi_login *login) 837 { 838 int ret; 839 u32 payload_length; 840 struct iscsi_param *param; 841 struct iscsi_login_req *login_req; 842 struct iscsi_login_rsp *login_rsp; 843 844 login_req = (struct iscsi_login_req *) login->req; 845 login_rsp = (struct iscsi_login_rsp *) login->rsp; 846 payload_length = ntoh24(login_req->dlength); 847 848 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 849 if (!param) 850 return -1; 851 852 ret = iscsi_decode_text_input( 853 PHASE_SECURITY|PHASE_DECLARATIVE, 854 SENDER_INITIATOR|SENDER_RECEIVER, 855 login->req_buf, 856 payload_length, 857 conn); 858 if (ret < 0) 859 return -1; 860 861 if (ret > 0) { 862 if (login->auth_complete) { 863 pr_err("Initiator has already been" 864 " successfully authenticated, but is still" 865 " sending %s keys.\n", param->value); 866 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 867 ISCSI_LOGIN_STATUS_INIT_ERR); 868 return -1; 869 } 870 871 goto do_auth; 872 } else if (!payload_length) { 873 pr_err("Initiator sent zero length security payload," 874 " login failed\n"); 875 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 876 ISCSI_LOGIN_STATUS_AUTH_FAILED); 877 return -1; 878 } 879 880 if (login->first_request) 881 if (iscsi_target_check_first_request(conn, login) < 0) 882 return -1; 883 884 ret = iscsi_encode_text_output( 885 PHASE_SECURITY|PHASE_DECLARATIVE, 886 SENDER_TARGET, 887 login->rsp_buf, 888 &login->rsp_length, 889 conn->param_list); 890 if (ret < 0) 891 return -1; 892 893 if (!iscsi_check_negotiated_keys(conn->param_list)) { 894 if (conn->tpg->tpg_attrib.authentication && 895 !strncmp(param->value, NONE, 4)) { 896 pr_err("Initiator sent AuthMethod=None but" 897 " Target is enforcing iSCSI Authentication," 898 " login failed.\n"); 899 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 900 ISCSI_LOGIN_STATUS_AUTH_FAILED); 901 return -1; 902 } 903 904 if (conn->tpg->tpg_attrib.authentication && 905 !login->auth_complete) 906 return 0; 907 908 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 909 return 0; 910 911 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 912 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 913 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 914 ISCSI_FLAG_LOGIN_TRANSIT; 915 login->current_stage = 1; 916 } 917 } 918 919 return 0; 920 do_auth: 921 return iscsi_target_do_authentication(conn, login); 922 } 923 924 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 925 { 926 int ret; 927 u32 payload_length; 928 struct iscsi_login_req *login_req; 929 struct iscsi_login_rsp *login_rsp; 930 931 login_req = (struct iscsi_login_req *) login->req; 932 login_rsp = (struct iscsi_login_rsp *) login->rsp; 933 payload_length = ntoh24(login_req->dlength); 934 935 ret = iscsi_decode_text_input( 936 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 937 SENDER_INITIATOR|SENDER_RECEIVER, 938 login->req_buf, 939 payload_length, 940 conn); 941 if (ret < 0) { 942 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 943 ISCSI_LOGIN_STATUS_INIT_ERR); 944 return -1; 945 } 946 947 if (login->first_request) 948 if (iscsi_target_check_first_request(conn, login) < 0) 949 return -1; 950 951 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 952 return -1; 953 954 ret = iscsi_encode_text_output( 955 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 956 SENDER_TARGET, 957 login->rsp_buf, 958 &login->rsp_length, 959 conn->param_list); 960 if (ret < 0) { 961 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 962 ISCSI_LOGIN_STATUS_INIT_ERR); 963 return -1; 964 } 965 966 if (!login->auth_complete && 967 conn->tpg->tpg_attrib.authentication) { 968 pr_err("Initiator is requesting CSG: 1, has not been" 969 " successfully authenticated, and the Target is" 970 " enforcing iSCSI Authentication, login failed.\n"); 971 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 972 ISCSI_LOGIN_STATUS_AUTH_FAILED); 973 return -1; 974 } 975 976 if (!iscsi_check_negotiated_keys(conn->param_list)) 977 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 978 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 979 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 980 ISCSI_FLAG_LOGIN_TRANSIT; 981 982 return 0; 983 } 984 985 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 986 { 987 int pdu_count = 0; 988 struct iscsi_login_req *login_req; 989 struct iscsi_login_rsp *login_rsp; 990 991 login_req = (struct iscsi_login_req *) login->req; 992 login_rsp = (struct iscsi_login_rsp *) login->rsp; 993 994 while (1) { 995 if (++pdu_count > MAX_LOGIN_PDUS) { 996 pr_err("MAX_LOGIN_PDUS count reached.\n"); 997 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 998 ISCSI_LOGIN_STATUS_TARGET_ERROR); 999 return -1; 1000 } 1001 1002 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 1003 case 0: 1004 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 1005 if (iscsi_target_handle_csg_zero(conn, login) < 0) 1006 return -1; 1007 break; 1008 case 1: 1009 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 1010 if (iscsi_target_handle_csg_one(conn, login) < 0) 1011 return -1; 1012 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1013 /* 1014 * Check to make sure the TCP connection has not 1015 * dropped asynchronously while session reinstatement 1016 * was occuring in this kthread context, before 1017 * transitioning to full feature phase operation. 1018 */ 1019 if (iscsi_target_sk_check_close(conn)) 1020 return -1; 1021 1022 login->tsih = conn->sess->tsih; 1023 login->login_complete = 1; 1024 iscsi_target_restore_sock_callbacks(conn); 1025 if (iscsi_target_do_tx_login_io(conn, 1026 login) < 0) 1027 return -1; 1028 return 1; 1029 } 1030 break; 1031 default: 1032 pr_err("Illegal CSG: %d received from" 1033 " Initiator, protocol error.\n", 1034 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1035 break; 1036 } 1037 1038 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1039 return -1; 1040 1041 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1042 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1043 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1044 } 1045 break; 1046 } 1047 1048 return 0; 1049 } 1050 1051 static void iscsi_initiatorname_tolower( 1052 char *param_buf) 1053 { 1054 char *c; 1055 u32 iqn_size = strlen(param_buf), i; 1056 1057 for (i = 0; i < iqn_size; i++) { 1058 c = ¶m_buf[i]; 1059 if (!isupper(*c)) 1060 continue; 1061 1062 *c = tolower(*c); 1063 } 1064 } 1065 1066 /* 1067 * Processes the first Login Request.. 1068 */ 1069 int iscsi_target_locate_portal( 1070 struct iscsi_np *np, 1071 struct iscsi_conn *conn, 1072 struct iscsi_login *login) 1073 { 1074 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1075 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1076 struct iscsi_session *sess = conn->sess; 1077 struct iscsi_tiqn *tiqn; 1078 struct iscsi_tpg_np *tpg_np = NULL; 1079 struct iscsi_login_req *login_req; 1080 struct se_node_acl *se_nacl; 1081 u32 payload_length, queue_depth = 0; 1082 int sessiontype = 0, ret = 0, tag_num, tag_size; 1083 1084 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1085 INIT_DELAYED_WORK(&conn->login_cleanup_work, iscsi_target_do_cleanup); 1086 iscsi_target_set_sock_callbacks(conn); 1087 1088 login->np = np; 1089 1090 login_req = (struct iscsi_login_req *) login->req; 1091 payload_length = ntoh24(login_req->dlength); 1092 1093 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1094 if (!tmpbuf) { 1095 pr_err("Unable to allocate memory for tmpbuf.\n"); 1096 return -1; 1097 } 1098 1099 memcpy(tmpbuf, login->req_buf, payload_length); 1100 tmpbuf[payload_length] = '\0'; 1101 start = tmpbuf; 1102 end = (start + payload_length); 1103 1104 /* 1105 * Locate the initial keys expected from the Initiator node in 1106 * the first login request in order to progress with the login phase. 1107 */ 1108 while (start < end) { 1109 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1110 ret = -1; 1111 goto out; 1112 } 1113 1114 if (!strncmp(key, "InitiatorName", 13)) 1115 i_buf = value; 1116 else if (!strncmp(key, "SessionType", 11)) 1117 s_buf = value; 1118 else if (!strncmp(key, "TargetName", 10)) 1119 t_buf = value; 1120 1121 start += strlen(key) + strlen(value) + 2; 1122 } 1123 /* 1124 * See 5.3. Login Phase. 1125 */ 1126 if (!i_buf) { 1127 pr_err("InitiatorName key not received" 1128 " in first login request.\n"); 1129 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1130 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1131 ret = -1; 1132 goto out; 1133 } 1134 /* 1135 * Convert the incoming InitiatorName to lowercase following 1136 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1137 * are NOT case sensitive. 1138 */ 1139 iscsi_initiatorname_tolower(i_buf); 1140 1141 if (!s_buf) { 1142 if (!login->leading_connection) 1143 goto get_target; 1144 1145 pr_err("SessionType key not received" 1146 " in first login request.\n"); 1147 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1148 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1149 ret = -1; 1150 goto out; 1151 } 1152 1153 /* 1154 * Use default portal group for discovery sessions. 1155 */ 1156 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1157 if (!sessiontype) { 1158 conn->tpg = iscsit_global->discovery_tpg; 1159 if (!login->leading_connection) 1160 goto get_target; 1161 1162 sess->sess_ops->SessionType = 1; 1163 /* 1164 * Setup crc32c modules from libcrypto 1165 */ 1166 if (iscsi_login_setup_crypto(conn) < 0) { 1167 pr_err("iscsi_login_setup_crypto() failed\n"); 1168 ret = -1; 1169 goto out; 1170 } 1171 /* 1172 * Serialize access across the discovery struct iscsi_portal_group to 1173 * process login attempt. 1174 */ 1175 if (iscsit_access_np(np, conn->tpg) < 0) { 1176 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1177 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1178 ret = -1; 1179 goto out; 1180 } 1181 ret = 0; 1182 goto alloc_tags; 1183 } 1184 1185 get_target: 1186 if (!t_buf) { 1187 pr_err("TargetName key not received" 1188 " in first login request while" 1189 " SessionType=Normal.\n"); 1190 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1191 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1192 ret = -1; 1193 goto out; 1194 } 1195 1196 /* 1197 * Locate Target IQN from Storage Node. 1198 */ 1199 tiqn = iscsit_get_tiqn_for_login(t_buf); 1200 if (!tiqn) { 1201 pr_err("Unable to locate Target IQN: %s in" 1202 " Storage Node\n", t_buf); 1203 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1204 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1205 ret = -1; 1206 goto out; 1207 } 1208 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1209 1210 /* 1211 * Locate Target Portal Group from Storage Node. 1212 */ 1213 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1214 if (!conn->tpg) { 1215 pr_err("Unable to locate Target Portal Group" 1216 " on %s\n", tiqn->tiqn); 1217 iscsit_put_tiqn_for_login(tiqn); 1218 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1219 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1220 ret = -1; 1221 goto out; 1222 } 1223 conn->tpg_np = tpg_np; 1224 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1225 /* 1226 * Setup crc32c modules from libcrypto 1227 */ 1228 if (iscsi_login_setup_crypto(conn) < 0) { 1229 pr_err("iscsi_login_setup_crypto() failed\n"); 1230 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1231 iscsit_put_tiqn_for_login(tiqn); 1232 conn->tpg = NULL; 1233 ret = -1; 1234 goto out; 1235 } 1236 /* 1237 * Serialize access across the struct iscsi_portal_group to 1238 * process login attempt. 1239 */ 1240 if (iscsit_access_np(np, conn->tpg) < 0) { 1241 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1242 iscsit_put_tiqn_for_login(tiqn); 1243 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1244 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1245 conn->tpg = NULL; 1246 ret = -1; 1247 goto out; 1248 } 1249 1250 /* 1251 * conn->sess->node_acl will be set when the referenced 1252 * struct iscsi_session is located from received ISID+TSIH in 1253 * iscsi_login_non_zero_tsih_s2(). 1254 */ 1255 if (!login->leading_connection) { 1256 ret = 0; 1257 goto out; 1258 } 1259 1260 /* 1261 * This value is required in iscsi_login_zero_tsih_s2() 1262 */ 1263 sess->sess_ops->SessionType = 0; 1264 1265 /* 1266 * Locate incoming Initiator IQN reference from Storage Node. 1267 */ 1268 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1269 &conn->tpg->tpg_se_tpg, i_buf); 1270 if (!sess->se_sess->se_node_acl) { 1271 pr_err("iSCSI Initiator Node: %s is not authorized to" 1272 " access iSCSI target portal group: %hu.\n", 1273 i_buf, conn->tpg->tpgt); 1274 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1275 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1276 ret = -1; 1277 goto out; 1278 } 1279 se_nacl = sess->se_sess->se_node_acl; 1280 queue_depth = se_nacl->queue_depth; 1281 /* 1282 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1283 * depth for non immediate commands, plus extra tags for immediate 1284 * commands. 1285 * 1286 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1287 * in per-cpu-ida tag allocation logic + small queue_depth. 1288 */ 1289 alloc_tags: 1290 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1291 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1292 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1293 1294 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1295 if (ret < 0) { 1296 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1297 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1298 ret = -1; 1299 } 1300 out: 1301 kfree(tmpbuf); 1302 return ret; 1303 } 1304 1305 int iscsi_target_start_negotiation( 1306 struct iscsi_login *login, 1307 struct iscsi_conn *conn) 1308 { 1309 int ret; 1310 1311 if (conn->sock) { 1312 struct sock *sk = conn->sock->sk; 1313 1314 write_lock_bh(&sk->sk_callback_lock); 1315 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1316 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1317 write_unlock_bh(&sk->sk_callback_lock); 1318 } 1319 /* 1320 * If iscsi_target_do_login returns zero to signal more PDU 1321 * exchanges are required to complete the login, go ahead and 1322 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1323 * is still active. 1324 * 1325 * Otherwise if TCP connection dropped asynchronously, go ahead 1326 * and perform connection cleanup now. 1327 */ 1328 ret = iscsi_target_do_login(conn, login); 1329 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1330 ret = -1; 1331 1332 if (ret < 0) { 1333 cancel_delayed_work_sync(&conn->login_work); 1334 cancel_delayed_work_sync(&conn->login_cleanup_work); 1335 iscsi_target_restore_sock_callbacks(conn); 1336 iscsi_remove_failed_auth_entry(conn); 1337 } 1338 if (ret != 0) 1339 iscsi_target_nego_release(conn); 1340 1341 return ret; 1342 } 1343 1344 void iscsi_target_nego_release(struct iscsi_conn *conn) 1345 { 1346 struct iscsi_login *login = conn->conn_login; 1347 1348 if (!login) 1349 return; 1350 1351 kfree(login->req_buf); 1352 kfree(login->rsp_buf); 1353 kfree(login); 1354 1355 conn->conn_login = NULL; 1356 } 1357