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 struct conn_timeout { 563 struct timer_list timer; 564 struct iscsi_conn *conn; 565 }; 566 567 static void iscsi_target_login_timeout(struct timer_list *t) 568 { 569 struct conn_timeout *timeout = from_timer(timeout, t, timer); 570 struct iscsi_conn *conn = timeout->conn; 571 572 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 573 574 if (conn->login_kworker) { 575 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 576 conn->login_kworker->comm, conn->login_kworker->pid); 577 send_sig(SIGINT, conn->login_kworker, 1); 578 } 579 } 580 581 static void iscsi_target_do_login_rx(struct work_struct *work) 582 { 583 struct iscsi_conn *conn = container_of(work, 584 struct iscsi_conn, login_work.work); 585 struct iscsi_login *login = conn->login; 586 struct iscsi_np *np = login->np; 587 struct iscsi_portal_group *tpg = conn->tpg; 588 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 589 struct conn_timeout timeout; 590 int rc, zero_tsih = login->zero_tsih; 591 bool state; 592 593 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 594 conn, current->comm, current->pid); 595 /* 596 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 597 * before initial PDU processing in iscsi_target_start_negotiation() 598 * has completed, go ahead and retry until it's cleared. 599 * 600 * Otherwise if the TCP connection drops while this is occuring, 601 * iscsi_target_start_negotiation() will detect the failure, call 602 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 603 * remaining iscsi connection resources from iscsi_np process context. 604 */ 605 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 606 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 607 return; 608 } 609 610 spin_lock(&tpg->tpg_state_lock); 611 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 612 spin_unlock(&tpg->tpg_state_lock); 613 614 if (!state) { 615 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 616 goto err; 617 } 618 619 if (iscsi_target_sk_check_close(conn)) { 620 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 621 goto err; 622 } 623 624 conn->login_kworker = current; 625 allow_signal(SIGINT); 626 627 timeout.conn = conn; 628 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0); 629 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 630 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid); 631 632 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 633 del_timer_sync(&timeout.timer); 634 destroy_timer_on_stack(&timeout.timer); 635 flush_signals(current); 636 conn->login_kworker = NULL; 637 638 if (rc < 0) 639 goto err; 640 641 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 642 conn, current->comm, current->pid); 643 644 rc = iscsi_target_do_login(conn, login); 645 if (rc < 0) { 646 goto err; 647 } else if (!rc) { 648 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE)) 649 goto err; 650 } else if (rc == 1) { 651 iscsi_target_nego_release(conn); 652 iscsi_post_login_handler(np, conn, zero_tsih); 653 iscsit_deaccess_np(np, tpg, tpg_np); 654 } 655 return; 656 657 err: 658 iscsi_target_restore_sock_callbacks(conn); 659 iscsi_target_login_drop(conn, login); 660 iscsit_deaccess_np(np, tpg, tpg_np); 661 } 662 663 static void iscsi_target_sk_state_change(struct sock *sk) 664 { 665 struct iscsi_conn *conn; 666 void (*orig_state_change)(struct sock *); 667 bool state; 668 669 pr_debug("Entering iscsi_target_sk_state_change\n"); 670 671 write_lock_bh(&sk->sk_callback_lock); 672 conn = sk->sk_user_data; 673 if (!conn) { 674 write_unlock_bh(&sk->sk_callback_lock); 675 return; 676 } 677 orig_state_change = conn->orig_state_change; 678 679 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 680 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 681 conn); 682 write_unlock_bh(&sk->sk_callback_lock); 683 orig_state_change(sk); 684 return; 685 } 686 state = __iscsi_target_sk_check_close(sk); 687 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 688 689 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 690 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 691 " conn: %p\n", conn); 692 if (state) 693 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 694 write_unlock_bh(&sk->sk_callback_lock); 695 orig_state_change(sk); 696 return; 697 } 698 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 699 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 700 conn); 701 write_unlock_bh(&sk->sk_callback_lock); 702 orig_state_change(sk); 703 return; 704 } 705 /* 706 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 707 * but only queue conn->login_work -> iscsi_target_do_login_rx() 708 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 709 * 710 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 711 * will detect the dropped TCP connection from delayed workqueue context. 712 * 713 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 714 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 715 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 716 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 717 * dropped TCP connection in iscsi_np process context, and cleaning up 718 * the remaining iscsi connection resources. 719 */ 720 if (state) { 721 pr_debug("iscsi_target_sk_state_change got failed state\n"); 722 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 723 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 724 write_unlock_bh(&sk->sk_callback_lock); 725 726 orig_state_change(sk); 727 728 if (!state) 729 schedule_delayed_work(&conn->login_work, 0); 730 return; 731 } 732 write_unlock_bh(&sk->sk_callback_lock); 733 734 orig_state_change(sk); 735 } 736 737 /* 738 * NOTE: We check for existing sessions or connections AFTER the initiator 739 * has been successfully authenticated in order to protect against faked 740 * ISID/TSIH combinations. 741 */ 742 static int iscsi_target_check_for_existing_instances( 743 struct iscsi_conn *conn, 744 struct iscsi_login *login) 745 { 746 if (login->checked_for_existing) 747 return 0; 748 749 login->checked_for_existing = 1; 750 751 if (!login->tsih) 752 return iscsi_check_for_session_reinstatement(conn); 753 else 754 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 755 login->initial_exp_statsn); 756 } 757 758 static int iscsi_target_do_authentication( 759 struct iscsi_conn *conn, 760 struct iscsi_login *login) 761 { 762 int authret; 763 u32 payload_length; 764 struct iscsi_param *param; 765 struct iscsi_login_req *login_req; 766 struct iscsi_login_rsp *login_rsp; 767 768 login_req = (struct iscsi_login_req *) login->req; 769 login_rsp = (struct iscsi_login_rsp *) login->rsp; 770 payload_length = ntoh24(login_req->dlength); 771 772 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 773 if (!param) 774 return -1; 775 776 authret = iscsi_handle_authentication( 777 conn, 778 login->req_buf, 779 login->rsp_buf, 780 payload_length, 781 &login->rsp_length, 782 param->value); 783 switch (authret) { 784 case 0: 785 pr_debug("Received OK response" 786 " from LIO Authentication, continuing.\n"); 787 break; 788 case 1: 789 pr_debug("iSCSI security negotiation" 790 " completed successfully.\n"); 791 login->auth_complete = 1; 792 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 793 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 794 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 795 ISCSI_FLAG_LOGIN_TRANSIT); 796 login->current_stage = 1; 797 } 798 return iscsi_target_check_for_existing_instances( 799 conn, login); 800 case 2: 801 pr_err("Security negotiation" 802 " failed.\n"); 803 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 804 ISCSI_LOGIN_STATUS_AUTH_FAILED); 805 return -1; 806 default: 807 pr_err("Received unknown error %d from LIO" 808 " Authentication\n", authret); 809 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 810 ISCSI_LOGIN_STATUS_TARGET_ERROR); 811 return -1; 812 } 813 814 return 0; 815 } 816 817 static int iscsi_target_handle_csg_zero( 818 struct iscsi_conn *conn, 819 struct iscsi_login *login) 820 { 821 int ret; 822 u32 payload_length; 823 struct iscsi_param *param; 824 struct iscsi_login_req *login_req; 825 struct iscsi_login_rsp *login_rsp; 826 827 login_req = (struct iscsi_login_req *) login->req; 828 login_rsp = (struct iscsi_login_rsp *) login->rsp; 829 payload_length = ntoh24(login_req->dlength); 830 831 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 832 if (!param) 833 return -1; 834 835 ret = iscsi_decode_text_input( 836 PHASE_SECURITY|PHASE_DECLARATIVE, 837 SENDER_INITIATOR|SENDER_RECEIVER, 838 login->req_buf, 839 payload_length, 840 conn); 841 if (ret < 0) 842 return -1; 843 844 if (ret > 0) { 845 if (login->auth_complete) { 846 pr_err("Initiator has already been" 847 " successfully authenticated, but is still" 848 " sending %s keys.\n", param->value); 849 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 850 ISCSI_LOGIN_STATUS_INIT_ERR); 851 return -1; 852 } 853 854 goto do_auth; 855 } else if (!payload_length) { 856 pr_err("Initiator sent zero length security payload," 857 " login failed\n"); 858 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 859 ISCSI_LOGIN_STATUS_AUTH_FAILED); 860 return -1; 861 } 862 863 if (login->first_request) 864 if (iscsi_target_check_first_request(conn, login) < 0) 865 return -1; 866 867 ret = iscsi_encode_text_output( 868 PHASE_SECURITY|PHASE_DECLARATIVE, 869 SENDER_TARGET, 870 login->rsp_buf, 871 &login->rsp_length, 872 conn->param_list, 873 conn->tpg->tpg_attrib.login_keys_workaround); 874 if (ret < 0) 875 return -1; 876 877 if (!iscsi_check_negotiated_keys(conn->param_list)) { 878 if (conn->tpg->tpg_attrib.authentication && 879 !strncmp(param->value, NONE, 4)) { 880 pr_err("Initiator sent AuthMethod=None but" 881 " Target is enforcing iSCSI Authentication," 882 " login failed.\n"); 883 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 884 ISCSI_LOGIN_STATUS_AUTH_FAILED); 885 return -1; 886 } 887 888 if (conn->tpg->tpg_attrib.authentication && 889 !login->auth_complete) 890 return 0; 891 892 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 893 return 0; 894 895 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 896 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 897 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 898 ISCSI_FLAG_LOGIN_TRANSIT; 899 login->current_stage = 1; 900 } 901 } 902 903 return 0; 904 do_auth: 905 return iscsi_target_do_authentication(conn, login); 906 } 907 908 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 909 { 910 int ret; 911 u32 payload_length; 912 struct iscsi_login_req *login_req; 913 struct iscsi_login_rsp *login_rsp; 914 915 login_req = (struct iscsi_login_req *) login->req; 916 login_rsp = (struct iscsi_login_rsp *) login->rsp; 917 payload_length = ntoh24(login_req->dlength); 918 919 ret = iscsi_decode_text_input( 920 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 921 SENDER_INITIATOR|SENDER_RECEIVER, 922 login->req_buf, 923 payload_length, 924 conn); 925 if (ret < 0) { 926 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 927 ISCSI_LOGIN_STATUS_INIT_ERR); 928 return -1; 929 } 930 931 if (login->first_request) 932 if (iscsi_target_check_first_request(conn, login) < 0) 933 return -1; 934 935 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 936 return -1; 937 938 ret = iscsi_encode_text_output( 939 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 940 SENDER_TARGET, 941 login->rsp_buf, 942 &login->rsp_length, 943 conn->param_list, 944 conn->tpg->tpg_attrib.login_keys_workaround); 945 if (ret < 0) { 946 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 947 ISCSI_LOGIN_STATUS_INIT_ERR); 948 return -1; 949 } 950 951 if (!login->auth_complete && 952 conn->tpg->tpg_attrib.authentication) { 953 pr_err("Initiator is requesting CSG: 1, has not been" 954 " successfully authenticated, and the Target is" 955 " enforcing iSCSI Authentication, login failed.\n"); 956 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 957 ISCSI_LOGIN_STATUS_AUTH_FAILED); 958 return -1; 959 } 960 961 if (!iscsi_check_negotiated_keys(conn->param_list)) 962 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 963 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 964 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 965 ISCSI_FLAG_LOGIN_TRANSIT; 966 967 return 0; 968 } 969 970 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 971 { 972 int pdu_count = 0; 973 struct iscsi_login_req *login_req; 974 struct iscsi_login_rsp *login_rsp; 975 976 login_req = (struct iscsi_login_req *) login->req; 977 login_rsp = (struct iscsi_login_rsp *) login->rsp; 978 979 while (1) { 980 if (++pdu_count > MAX_LOGIN_PDUS) { 981 pr_err("MAX_LOGIN_PDUS count reached.\n"); 982 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 983 ISCSI_LOGIN_STATUS_TARGET_ERROR); 984 return -1; 985 } 986 987 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 988 case 0: 989 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 990 if (iscsi_target_handle_csg_zero(conn, login) < 0) 991 return -1; 992 break; 993 case 1: 994 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 995 if (iscsi_target_handle_csg_one(conn, login) < 0) 996 return -1; 997 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 998 /* 999 * Check to make sure the TCP connection has not 1000 * dropped asynchronously while session reinstatement 1001 * was occuring in this kthread context, before 1002 * transitioning to full feature phase operation. 1003 */ 1004 if (iscsi_target_sk_check_close(conn)) 1005 return -1; 1006 1007 login->tsih = conn->sess->tsih; 1008 login->login_complete = 1; 1009 iscsi_target_restore_sock_callbacks(conn); 1010 if (iscsi_target_do_tx_login_io(conn, 1011 login) < 0) 1012 return -1; 1013 return 1; 1014 } 1015 break; 1016 default: 1017 pr_err("Illegal CSG: %d received from" 1018 " Initiator, protocol error.\n", 1019 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1020 break; 1021 } 1022 1023 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1024 return -1; 1025 1026 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1027 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1028 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1029 } 1030 break; 1031 } 1032 1033 return 0; 1034 } 1035 1036 static void iscsi_initiatorname_tolower( 1037 char *param_buf) 1038 { 1039 char *c; 1040 u32 iqn_size = strlen(param_buf), i; 1041 1042 for (i = 0; i < iqn_size; i++) { 1043 c = ¶m_buf[i]; 1044 if (!isupper(*c)) 1045 continue; 1046 1047 *c = tolower(*c); 1048 } 1049 } 1050 1051 /* 1052 * Processes the first Login Request.. 1053 */ 1054 int iscsi_target_locate_portal( 1055 struct iscsi_np *np, 1056 struct iscsi_conn *conn, 1057 struct iscsi_login *login) 1058 { 1059 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1060 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1061 struct iscsi_session *sess = conn->sess; 1062 struct iscsi_tiqn *tiqn; 1063 struct iscsi_tpg_np *tpg_np = NULL; 1064 struct iscsi_login_req *login_req; 1065 struct se_node_acl *se_nacl; 1066 u32 payload_length, queue_depth = 0; 1067 int sessiontype = 0, ret = 0, tag_num, tag_size; 1068 1069 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1070 iscsi_target_set_sock_callbacks(conn); 1071 1072 login->np = np; 1073 1074 login_req = (struct iscsi_login_req *) login->req; 1075 payload_length = ntoh24(login_req->dlength); 1076 1077 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1078 if (!tmpbuf) { 1079 pr_err("Unable to allocate memory for tmpbuf.\n"); 1080 return -1; 1081 } 1082 1083 memcpy(tmpbuf, login->req_buf, payload_length); 1084 tmpbuf[payload_length] = '\0'; 1085 start = tmpbuf; 1086 end = (start + payload_length); 1087 1088 /* 1089 * Locate the initial keys expected from the Initiator node in 1090 * the first login request in order to progress with the login phase. 1091 */ 1092 while (start < end) { 1093 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1094 ret = -1; 1095 goto out; 1096 } 1097 1098 if (!strncmp(key, "InitiatorName", 13)) 1099 i_buf = value; 1100 else if (!strncmp(key, "SessionType", 11)) 1101 s_buf = value; 1102 else if (!strncmp(key, "TargetName", 10)) 1103 t_buf = value; 1104 1105 start += strlen(key) + strlen(value) + 2; 1106 } 1107 /* 1108 * See 5.3. Login Phase. 1109 */ 1110 if (!i_buf) { 1111 pr_err("InitiatorName key not received" 1112 " in first login request.\n"); 1113 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1114 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1115 ret = -1; 1116 goto out; 1117 } 1118 /* 1119 * Convert the incoming InitiatorName to lowercase following 1120 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1121 * are NOT case sensitive. 1122 */ 1123 iscsi_initiatorname_tolower(i_buf); 1124 1125 if (!s_buf) { 1126 if (!login->leading_connection) 1127 goto get_target; 1128 1129 pr_err("SessionType key not received" 1130 " in first login request.\n"); 1131 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1132 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1133 ret = -1; 1134 goto out; 1135 } 1136 1137 /* 1138 * Use default portal group for discovery sessions. 1139 */ 1140 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1141 if (!sessiontype) { 1142 conn->tpg = iscsit_global->discovery_tpg; 1143 if (!login->leading_connection) 1144 goto get_target; 1145 1146 sess->sess_ops->SessionType = 1; 1147 /* 1148 * Setup crc32c modules from libcrypto 1149 */ 1150 if (iscsi_login_setup_crypto(conn) < 0) { 1151 pr_err("iscsi_login_setup_crypto() failed\n"); 1152 ret = -1; 1153 goto out; 1154 } 1155 /* 1156 * Serialize access across the discovery struct iscsi_portal_group to 1157 * process login attempt. 1158 */ 1159 if (iscsit_access_np(np, conn->tpg) < 0) { 1160 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1161 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1162 ret = -1; 1163 goto out; 1164 } 1165 ret = 0; 1166 goto alloc_tags; 1167 } 1168 1169 get_target: 1170 if (!t_buf) { 1171 pr_err("TargetName key not received" 1172 " in first login request while" 1173 " SessionType=Normal.\n"); 1174 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1175 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1176 ret = -1; 1177 goto out; 1178 } 1179 1180 /* 1181 * Locate Target IQN from Storage Node. 1182 */ 1183 tiqn = iscsit_get_tiqn_for_login(t_buf); 1184 if (!tiqn) { 1185 pr_err("Unable to locate Target IQN: %s in" 1186 " Storage Node\n", t_buf); 1187 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1188 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1189 ret = -1; 1190 goto out; 1191 } 1192 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1193 1194 /* 1195 * Locate Target Portal Group from Storage Node. 1196 */ 1197 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1198 if (!conn->tpg) { 1199 pr_err("Unable to locate Target Portal Group" 1200 " on %s\n", tiqn->tiqn); 1201 iscsit_put_tiqn_for_login(tiqn); 1202 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1203 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1204 ret = -1; 1205 goto out; 1206 } 1207 conn->tpg_np = tpg_np; 1208 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1209 /* 1210 * Setup crc32c modules from libcrypto 1211 */ 1212 if (iscsi_login_setup_crypto(conn) < 0) { 1213 pr_err("iscsi_login_setup_crypto() failed\n"); 1214 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1215 iscsit_put_tiqn_for_login(tiqn); 1216 conn->tpg = NULL; 1217 ret = -1; 1218 goto out; 1219 } 1220 /* 1221 * Serialize access across the struct iscsi_portal_group to 1222 * process login attempt. 1223 */ 1224 if (iscsit_access_np(np, conn->tpg) < 0) { 1225 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1226 iscsit_put_tiqn_for_login(tiqn); 1227 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1228 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1229 conn->tpg = NULL; 1230 ret = -1; 1231 goto out; 1232 } 1233 1234 /* 1235 * conn->sess->node_acl will be set when the referenced 1236 * struct iscsi_session is located from received ISID+TSIH in 1237 * iscsi_login_non_zero_tsih_s2(). 1238 */ 1239 if (!login->leading_connection) { 1240 ret = 0; 1241 goto out; 1242 } 1243 1244 /* 1245 * This value is required in iscsi_login_zero_tsih_s2() 1246 */ 1247 sess->sess_ops->SessionType = 0; 1248 1249 /* 1250 * Locate incoming Initiator IQN reference from Storage Node. 1251 */ 1252 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1253 &conn->tpg->tpg_se_tpg, i_buf); 1254 if (!sess->se_sess->se_node_acl) { 1255 pr_err("iSCSI Initiator Node: %s is not authorized to" 1256 " access iSCSI target portal group: %hu.\n", 1257 i_buf, conn->tpg->tpgt); 1258 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1259 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1260 ret = -1; 1261 goto out; 1262 } 1263 se_nacl = sess->se_sess->se_node_acl; 1264 queue_depth = se_nacl->queue_depth; 1265 /* 1266 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1267 * depth for non immediate commands, plus extra tags for immediate 1268 * commands. 1269 * 1270 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1271 * in per-cpu-ida tag allocation logic + small queue_depth. 1272 */ 1273 alloc_tags: 1274 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1275 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1276 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1277 1278 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1279 if (ret < 0) { 1280 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1281 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1282 ret = -1; 1283 } 1284 out: 1285 kfree(tmpbuf); 1286 return ret; 1287 } 1288 1289 int iscsi_target_start_negotiation( 1290 struct iscsi_login *login, 1291 struct iscsi_conn *conn) 1292 { 1293 int ret; 1294 1295 if (conn->sock) { 1296 struct sock *sk = conn->sock->sk; 1297 1298 write_lock_bh(&sk->sk_callback_lock); 1299 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1300 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1301 write_unlock_bh(&sk->sk_callback_lock); 1302 } 1303 /* 1304 * If iscsi_target_do_login returns zero to signal more PDU 1305 * exchanges are required to complete the login, go ahead and 1306 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1307 * is still active. 1308 * 1309 * Otherwise if TCP connection dropped asynchronously, go ahead 1310 * and perform connection cleanup now. 1311 */ 1312 ret = iscsi_target_do_login(conn, login); 1313 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1314 ret = -1; 1315 1316 if (ret < 0) { 1317 cancel_delayed_work_sync(&conn->login_work); 1318 iscsi_target_restore_sock_callbacks(conn); 1319 iscsi_remove_failed_auth_entry(conn); 1320 } 1321 if (ret != 0) 1322 iscsi_target_nego_release(conn); 1323 1324 return ret; 1325 } 1326 1327 void iscsi_target_nego_release(struct iscsi_conn *conn) 1328 { 1329 struct iscsi_login *login = conn->conn_login; 1330 1331 if (!login) 1332 return; 1333 1334 kfree(login->req_buf); 1335 kfree(login->rsp_buf); 1336 kfree(login); 1337 1338 conn->conn_login = NULL; 1339 } 1340