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_sk_state_change(struct sock *sk) 659 { 660 struct iscsi_conn *conn; 661 void (*orig_state_change)(struct sock *); 662 bool state; 663 664 pr_debug("Entering iscsi_target_sk_state_change\n"); 665 666 write_lock_bh(&sk->sk_callback_lock); 667 conn = sk->sk_user_data; 668 if (!conn) { 669 write_unlock_bh(&sk->sk_callback_lock); 670 return; 671 } 672 orig_state_change = conn->orig_state_change; 673 674 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 675 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 676 conn); 677 write_unlock_bh(&sk->sk_callback_lock); 678 orig_state_change(sk); 679 return; 680 } 681 state = __iscsi_target_sk_check_close(sk); 682 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 683 684 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 685 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 686 " conn: %p\n", conn); 687 if (state) 688 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 689 write_unlock_bh(&sk->sk_callback_lock); 690 orig_state_change(sk); 691 return; 692 } 693 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 694 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 695 conn); 696 write_unlock_bh(&sk->sk_callback_lock); 697 orig_state_change(sk); 698 return; 699 } 700 /* 701 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 702 * but only queue conn->login_work -> iscsi_target_do_login_rx() 703 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 704 * 705 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 706 * will detect the dropped TCP connection from delayed workqueue context. 707 * 708 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 709 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 710 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 711 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 712 * dropped TCP connection in iscsi_np process context, and cleaning up 713 * the remaining iscsi connection resources. 714 */ 715 if (state) { 716 pr_debug("iscsi_target_sk_state_change got failed state\n"); 717 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 718 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 719 write_unlock_bh(&sk->sk_callback_lock); 720 721 orig_state_change(sk); 722 723 if (!state) 724 schedule_delayed_work(&conn->login_work, 0); 725 return; 726 } 727 write_unlock_bh(&sk->sk_callback_lock); 728 729 orig_state_change(sk); 730 } 731 732 /* 733 * NOTE: We check for existing sessions or connections AFTER the initiator 734 * has been successfully authenticated in order to protect against faked 735 * ISID/TSIH combinations. 736 */ 737 static int iscsi_target_check_for_existing_instances( 738 struct iscsi_conn *conn, 739 struct iscsi_login *login) 740 { 741 if (login->checked_for_existing) 742 return 0; 743 744 login->checked_for_existing = 1; 745 746 if (!login->tsih) 747 return iscsi_check_for_session_reinstatement(conn); 748 else 749 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 750 login->initial_exp_statsn); 751 } 752 753 static int iscsi_target_do_authentication( 754 struct iscsi_conn *conn, 755 struct iscsi_login *login) 756 { 757 int authret; 758 u32 payload_length; 759 struct iscsi_param *param; 760 struct iscsi_login_req *login_req; 761 struct iscsi_login_rsp *login_rsp; 762 763 login_req = (struct iscsi_login_req *) login->req; 764 login_rsp = (struct iscsi_login_rsp *) login->rsp; 765 payload_length = ntoh24(login_req->dlength); 766 767 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 768 if (!param) 769 return -1; 770 771 authret = iscsi_handle_authentication( 772 conn, 773 login->req_buf, 774 login->rsp_buf, 775 payload_length, 776 &login->rsp_length, 777 param->value); 778 switch (authret) { 779 case 0: 780 pr_debug("Received OK response" 781 " from LIO Authentication, continuing.\n"); 782 break; 783 case 1: 784 pr_debug("iSCSI security negotiation" 785 " completed successfully.\n"); 786 login->auth_complete = 1; 787 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 788 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 789 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 790 ISCSI_FLAG_LOGIN_TRANSIT); 791 login->current_stage = 1; 792 } 793 return iscsi_target_check_for_existing_instances( 794 conn, login); 795 case 2: 796 pr_err("Security negotiation" 797 " failed.\n"); 798 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 799 ISCSI_LOGIN_STATUS_AUTH_FAILED); 800 return -1; 801 default: 802 pr_err("Received unknown error %d from LIO" 803 " Authentication\n", authret); 804 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 805 ISCSI_LOGIN_STATUS_TARGET_ERROR); 806 return -1; 807 } 808 809 return 0; 810 } 811 812 static int iscsi_target_handle_csg_zero( 813 struct iscsi_conn *conn, 814 struct iscsi_login *login) 815 { 816 int ret; 817 u32 payload_length; 818 struct iscsi_param *param; 819 struct iscsi_login_req *login_req; 820 struct iscsi_login_rsp *login_rsp; 821 822 login_req = (struct iscsi_login_req *) login->req; 823 login_rsp = (struct iscsi_login_rsp *) login->rsp; 824 payload_length = ntoh24(login_req->dlength); 825 826 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 827 if (!param) 828 return -1; 829 830 ret = iscsi_decode_text_input( 831 PHASE_SECURITY|PHASE_DECLARATIVE, 832 SENDER_INITIATOR|SENDER_RECEIVER, 833 login->req_buf, 834 payload_length, 835 conn); 836 if (ret < 0) 837 return -1; 838 839 if (ret > 0) { 840 if (login->auth_complete) { 841 pr_err("Initiator has already been" 842 " successfully authenticated, but is still" 843 " sending %s keys.\n", param->value); 844 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 845 ISCSI_LOGIN_STATUS_INIT_ERR); 846 return -1; 847 } 848 849 goto do_auth; 850 } else if (!payload_length) { 851 pr_err("Initiator sent zero length security payload," 852 " login failed\n"); 853 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 854 ISCSI_LOGIN_STATUS_AUTH_FAILED); 855 return -1; 856 } 857 858 if (login->first_request) 859 if (iscsi_target_check_first_request(conn, login) < 0) 860 return -1; 861 862 ret = iscsi_encode_text_output( 863 PHASE_SECURITY|PHASE_DECLARATIVE, 864 SENDER_TARGET, 865 login->rsp_buf, 866 &login->rsp_length, 867 conn->param_list, 868 conn->tpg->tpg_attrib.login_keys_workaround); 869 if (ret < 0) 870 return -1; 871 872 if (!iscsi_check_negotiated_keys(conn->param_list)) { 873 if (conn->tpg->tpg_attrib.authentication && 874 !strncmp(param->value, NONE, 4)) { 875 pr_err("Initiator sent AuthMethod=None but" 876 " Target is enforcing iSCSI Authentication," 877 " login failed.\n"); 878 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 879 ISCSI_LOGIN_STATUS_AUTH_FAILED); 880 return -1; 881 } 882 883 if (conn->tpg->tpg_attrib.authentication && 884 !login->auth_complete) 885 return 0; 886 887 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 888 return 0; 889 890 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 891 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 892 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 893 ISCSI_FLAG_LOGIN_TRANSIT; 894 login->current_stage = 1; 895 } 896 } 897 898 return 0; 899 do_auth: 900 return iscsi_target_do_authentication(conn, login); 901 } 902 903 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 904 { 905 int ret; 906 u32 payload_length; 907 struct iscsi_login_req *login_req; 908 struct iscsi_login_rsp *login_rsp; 909 910 login_req = (struct iscsi_login_req *) login->req; 911 login_rsp = (struct iscsi_login_rsp *) login->rsp; 912 payload_length = ntoh24(login_req->dlength); 913 914 ret = iscsi_decode_text_input( 915 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 916 SENDER_INITIATOR|SENDER_RECEIVER, 917 login->req_buf, 918 payload_length, 919 conn); 920 if (ret < 0) { 921 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 922 ISCSI_LOGIN_STATUS_INIT_ERR); 923 return -1; 924 } 925 926 if (login->first_request) 927 if (iscsi_target_check_first_request(conn, login) < 0) 928 return -1; 929 930 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 931 return -1; 932 933 ret = iscsi_encode_text_output( 934 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 935 SENDER_TARGET, 936 login->rsp_buf, 937 &login->rsp_length, 938 conn->param_list, 939 conn->tpg->tpg_attrib.login_keys_workaround); 940 if (ret < 0) { 941 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 942 ISCSI_LOGIN_STATUS_INIT_ERR); 943 return -1; 944 } 945 946 if (!login->auth_complete && 947 conn->tpg->tpg_attrib.authentication) { 948 pr_err("Initiator is requesting CSG: 1, has not been" 949 " successfully authenticated, and the Target is" 950 " enforcing iSCSI Authentication, login failed.\n"); 951 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 952 ISCSI_LOGIN_STATUS_AUTH_FAILED); 953 return -1; 954 } 955 956 if (!iscsi_check_negotiated_keys(conn->param_list)) 957 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 958 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 959 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 960 ISCSI_FLAG_LOGIN_TRANSIT; 961 962 return 0; 963 } 964 965 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 966 { 967 int pdu_count = 0; 968 struct iscsi_login_req *login_req; 969 struct iscsi_login_rsp *login_rsp; 970 971 login_req = (struct iscsi_login_req *) login->req; 972 login_rsp = (struct iscsi_login_rsp *) login->rsp; 973 974 while (1) { 975 if (++pdu_count > MAX_LOGIN_PDUS) { 976 pr_err("MAX_LOGIN_PDUS count reached.\n"); 977 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 978 ISCSI_LOGIN_STATUS_TARGET_ERROR); 979 return -1; 980 } 981 982 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 983 case 0: 984 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 985 if (iscsi_target_handle_csg_zero(conn, login) < 0) 986 return -1; 987 break; 988 case 1: 989 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 990 if (iscsi_target_handle_csg_one(conn, login) < 0) 991 return -1; 992 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 993 /* 994 * Check to make sure the TCP connection has not 995 * dropped asynchronously while session reinstatement 996 * was occuring in this kthread context, before 997 * transitioning to full feature phase operation. 998 */ 999 if (iscsi_target_sk_check_close(conn)) 1000 return -1; 1001 1002 login->tsih = conn->sess->tsih; 1003 login->login_complete = 1; 1004 iscsi_target_restore_sock_callbacks(conn); 1005 if (iscsi_target_do_tx_login_io(conn, 1006 login) < 0) 1007 return -1; 1008 return 1; 1009 } 1010 break; 1011 default: 1012 pr_err("Illegal CSG: %d received from" 1013 " Initiator, protocol error.\n", 1014 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1015 break; 1016 } 1017 1018 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1019 return -1; 1020 1021 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1022 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1023 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1024 } 1025 break; 1026 } 1027 1028 return 0; 1029 } 1030 1031 static void iscsi_initiatorname_tolower( 1032 char *param_buf) 1033 { 1034 char *c; 1035 u32 iqn_size = strlen(param_buf), i; 1036 1037 for (i = 0; i < iqn_size; i++) { 1038 c = ¶m_buf[i]; 1039 if (!isupper(*c)) 1040 continue; 1041 1042 *c = tolower(*c); 1043 } 1044 } 1045 1046 /* 1047 * Processes the first Login Request.. 1048 */ 1049 int iscsi_target_locate_portal( 1050 struct iscsi_np *np, 1051 struct iscsi_conn *conn, 1052 struct iscsi_login *login) 1053 { 1054 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1055 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1056 struct iscsi_session *sess = conn->sess; 1057 struct iscsi_tiqn *tiqn; 1058 struct iscsi_tpg_np *tpg_np = NULL; 1059 struct iscsi_login_req *login_req; 1060 struct se_node_acl *se_nacl; 1061 u32 payload_length, queue_depth = 0; 1062 int sessiontype = 0, ret = 0, tag_num, tag_size; 1063 1064 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1065 iscsi_target_set_sock_callbacks(conn); 1066 1067 login->np = np; 1068 1069 login_req = (struct iscsi_login_req *) login->req; 1070 payload_length = ntoh24(login_req->dlength); 1071 1072 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1073 if (!tmpbuf) { 1074 pr_err("Unable to allocate memory for tmpbuf.\n"); 1075 return -1; 1076 } 1077 1078 memcpy(tmpbuf, login->req_buf, payload_length); 1079 tmpbuf[payload_length] = '\0'; 1080 start = tmpbuf; 1081 end = (start + payload_length); 1082 1083 /* 1084 * Locate the initial keys expected from the Initiator node in 1085 * the first login request in order to progress with the login phase. 1086 */ 1087 while (start < end) { 1088 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1089 ret = -1; 1090 goto out; 1091 } 1092 1093 if (!strncmp(key, "InitiatorName", 13)) 1094 i_buf = value; 1095 else if (!strncmp(key, "SessionType", 11)) 1096 s_buf = value; 1097 else if (!strncmp(key, "TargetName", 10)) 1098 t_buf = value; 1099 1100 start += strlen(key) + strlen(value) + 2; 1101 } 1102 /* 1103 * See 5.3. Login Phase. 1104 */ 1105 if (!i_buf) { 1106 pr_err("InitiatorName key not received" 1107 " in first login request.\n"); 1108 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1109 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1110 ret = -1; 1111 goto out; 1112 } 1113 /* 1114 * Convert the incoming InitiatorName to lowercase following 1115 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1116 * are NOT case sensitive. 1117 */ 1118 iscsi_initiatorname_tolower(i_buf); 1119 1120 if (!s_buf) { 1121 if (!login->leading_connection) 1122 goto get_target; 1123 1124 pr_err("SessionType key not received" 1125 " in first login request.\n"); 1126 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1127 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1128 ret = -1; 1129 goto out; 1130 } 1131 1132 /* 1133 * Use default portal group for discovery sessions. 1134 */ 1135 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1136 if (!sessiontype) { 1137 conn->tpg = iscsit_global->discovery_tpg; 1138 if (!login->leading_connection) 1139 goto get_target; 1140 1141 sess->sess_ops->SessionType = 1; 1142 /* 1143 * Setup crc32c modules from libcrypto 1144 */ 1145 if (iscsi_login_setup_crypto(conn) < 0) { 1146 pr_err("iscsi_login_setup_crypto() failed\n"); 1147 ret = -1; 1148 goto out; 1149 } 1150 /* 1151 * Serialize access across the discovery struct iscsi_portal_group to 1152 * process login attempt. 1153 */ 1154 if (iscsit_access_np(np, conn->tpg) < 0) { 1155 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1156 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1157 ret = -1; 1158 goto out; 1159 } 1160 ret = 0; 1161 goto alloc_tags; 1162 } 1163 1164 get_target: 1165 if (!t_buf) { 1166 pr_err("TargetName key not received" 1167 " in first login request while" 1168 " SessionType=Normal.\n"); 1169 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1170 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1171 ret = -1; 1172 goto out; 1173 } 1174 1175 /* 1176 * Locate Target IQN from Storage Node. 1177 */ 1178 tiqn = iscsit_get_tiqn_for_login(t_buf); 1179 if (!tiqn) { 1180 pr_err("Unable to locate Target IQN: %s in" 1181 " Storage Node\n", t_buf); 1182 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1183 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1184 ret = -1; 1185 goto out; 1186 } 1187 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1188 1189 /* 1190 * Locate Target Portal Group from Storage Node. 1191 */ 1192 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1193 if (!conn->tpg) { 1194 pr_err("Unable to locate Target Portal Group" 1195 " on %s\n", tiqn->tiqn); 1196 iscsit_put_tiqn_for_login(tiqn); 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 conn->tpg_np = tpg_np; 1203 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1204 /* 1205 * Setup crc32c modules from libcrypto 1206 */ 1207 if (iscsi_login_setup_crypto(conn) < 0) { 1208 pr_err("iscsi_login_setup_crypto() failed\n"); 1209 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1210 iscsit_put_tiqn_for_login(tiqn); 1211 conn->tpg = NULL; 1212 ret = -1; 1213 goto out; 1214 } 1215 /* 1216 * Serialize access across the struct iscsi_portal_group to 1217 * process login attempt. 1218 */ 1219 if (iscsit_access_np(np, conn->tpg) < 0) { 1220 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1221 iscsit_put_tiqn_for_login(tiqn); 1222 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1223 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1224 conn->tpg = NULL; 1225 ret = -1; 1226 goto out; 1227 } 1228 1229 /* 1230 * conn->sess->node_acl will be set when the referenced 1231 * struct iscsi_session is located from received ISID+TSIH in 1232 * iscsi_login_non_zero_tsih_s2(). 1233 */ 1234 if (!login->leading_connection) { 1235 ret = 0; 1236 goto out; 1237 } 1238 1239 /* 1240 * This value is required in iscsi_login_zero_tsih_s2() 1241 */ 1242 sess->sess_ops->SessionType = 0; 1243 1244 /* 1245 * Locate incoming Initiator IQN reference from Storage Node. 1246 */ 1247 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1248 &conn->tpg->tpg_se_tpg, i_buf); 1249 if (!sess->se_sess->se_node_acl) { 1250 pr_err("iSCSI Initiator Node: %s is not authorized to" 1251 " access iSCSI target portal group: %hu.\n", 1252 i_buf, conn->tpg->tpgt); 1253 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1254 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1255 ret = -1; 1256 goto out; 1257 } 1258 se_nacl = sess->se_sess->se_node_acl; 1259 queue_depth = se_nacl->queue_depth; 1260 /* 1261 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1262 * depth for non immediate commands, plus extra tags for immediate 1263 * commands. 1264 * 1265 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1266 * in per-cpu-ida tag allocation logic + small queue_depth. 1267 */ 1268 alloc_tags: 1269 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1270 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1271 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1272 1273 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1274 if (ret < 0) { 1275 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1276 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1277 ret = -1; 1278 } 1279 out: 1280 kfree(tmpbuf); 1281 return ret; 1282 } 1283 1284 int iscsi_target_start_negotiation( 1285 struct iscsi_login *login, 1286 struct iscsi_conn *conn) 1287 { 1288 int ret; 1289 1290 if (conn->sock) { 1291 struct sock *sk = conn->sock->sk; 1292 1293 write_lock_bh(&sk->sk_callback_lock); 1294 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1295 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1296 write_unlock_bh(&sk->sk_callback_lock); 1297 } 1298 /* 1299 * If iscsi_target_do_login returns zero to signal more PDU 1300 * exchanges are required to complete the login, go ahead and 1301 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1302 * is still active. 1303 * 1304 * Otherwise if TCP connection dropped asynchronously, go ahead 1305 * and perform connection cleanup now. 1306 */ 1307 ret = iscsi_target_do_login(conn, login); 1308 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1309 ret = -1; 1310 1311 if (ret < 0) { 1312 cancel_delayed_work_sync(&conn->login_work); 1313 iscsi_target_restore_sock_callbacks(conn); 1314 iscsi_remove_failed_auth_entry(conn); 1315 } 1316 if (ret != 0) 1317 iscsi_target_nego_release(conn); 1318 1319 return ret; 1320 } 1321 1322 void iscsi_target_nego_release(struct iscsi_conn *conn) 1323 { 1324 struct iscsi_login *login = conn->conn_login; 1325 1326 if (!login) 1327 return; 1328 1329 kfree(login->req_buf); 1330 kfree(login->rsp_buf); 1331 kfree(login); 1332 1333 conn->conn_login = NULL; 1334 } 1335