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 if (iscsi_target_sk_data_ready == conn->orig_data_ready) 436 return; 437 conn->orig_data_ready(sk); 438 return; 439 } 440 441 rc = schedule_delayed_work(&conn->login_work, 0); 442 if (!rc) { 443 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 444 " got false\n"); 445 } 446 write_unlock_bh(&sk->sk_callback_lock); 447 } 448 449 static void iscsi_target_sk_state_change(struct sock *); 450 451 static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn) 452 { 453 struct sock *sk; 454 455 if (!conn->sock) 456 return; 457 458 sk = conn->sock->sk; 459 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 460 461 write_lock_bh(&sk->sk_callback_lock); 462 sk->sk_user_data = conn; 463 conn->orig_data_ready = sk->sk_data_ready; 464 conn->orig_state_change = sk->sk_state_change; 465 sk->sk_data_ready = iscsi_target_sk_data_ready; 466 sk->sk_state_change = iscsi_target_sk_state_change; 467 write_unlock_bh(&sk->sk_callback_lock); 468 469 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 470 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 471 } 472 473 static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn) 474 { 475 struct sock *sk; 476 477 if (!conn->sock) 478 return; 479 480 sk = conn->sock->sk; 481 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 482 483 write_lock_bh(&sk->sk_callback_lock); 484 if (!sk->sk_user_data) { 485 write_unlock_bh(&sk->sk_callback_lock); 486 return; 487 } 488 sk->sk_user_data = NULL; 489 sk->sk_data_ready = conn->orig_data_ready; 490 sk->sk_state_change = conn->orig_state_change; 491 write_unlock_bh(&sk->sk_callback_lock); 492 493 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 494 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 495 } 496 497 static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *); 498 499 static bool __iscsi_target_sk_check_close(struct sock *sk) 500 { 501 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 502 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE," 503 "returning FALSE\n"); 504 return true; 505 } 506 return false; 507 } 508 509 static bool iscsi_target_sk_check_close(struct iscsi_conn *conn) 510 { 511 bool state = false; 512 513 if (conn->sock) { 514 struct sock *sk = conn->sock->sk; 515 516 read_lock_bh(&sk->sk_callback_lock); 517 state = (__iscsi_target_sk_check_close(sk) || 518 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 519 read_unlock_bh(&sk->sk_callback_lock); 520 } 521 return state; 522 } 523 524 static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag) 525 { 526 bool state = false; 527 528 if (conn->sock) { 529 struct sock *sk = conn->sock->sk; 530 531 read_lock_bh(&sk->sk_callback_lock); 532 state = test_bit(flag, &conn->login_flags); 533 read_unlock_bh(&sk->sk_callback_lock); 534 } 535 return state; 536 } 537 538 static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag) 539 { 540 bool state = false; 541 542 if (conn->sock) { 543 struct sock *sk = conn->sock->sk; 544 545 write_lock_bh(&sk->sk_callback_lock); 546 state = (__iscsi_target_sk_check_close(sk) || 547 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 548 if (!state) 549 clear_bit(flag, &conn->login_flags); 550 write_unlock_bh(&sk->sk_callback_lock); 551 } 552 return state; 553 } 554 555 static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login) 556 { 557 struct iscsi_np *np = login->np; 558 bool zero_tsih = login->zero_tsih; 559 560 iscsi_remove_failed_auth_entry(conn); 561 iscsi_target_nego_release(conn); 562 iscsi_target_login_sess_out(conn, np, zero_tsih, true); 563 } 564 565 struct conn_timeout { 566 struct timer_list timer; 567 struct iscsi_conn *conn; 568 }; 569 570 static void iscsi_target_login_timeout(struct timer_list *t) 571 { 572 struct conn_timeout *timeout = from_timer(timeout, t, timer); 573 struct iscsi_conn *conn = timeout->conn; 574 575 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 576 577 if (conn->login_kworker) { 578 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 579 conn->login_kworker->comm, conn->login_kworker->pid); 580 send_sig(SIGINT, conn->login_kworker, 1); 581 } 582 } 583 584 static void iscsi_target_do_login_rx(struct work_struct *work) 585 { 586 struct iscsi_conn *conn = container_of(work, 587 struct iscsi_conn, login_work.work); 588 struct iscsi_login *login = conn->login; 589 struct iscsi_np *np = login->np; 590 struct iscsi_portal_group *tpg = conn->tpg; 591 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 592 struct conn_timeout timeout; 593 int rc, zero_tsih = login->zero_tsih; 594 bool state; 595 596 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 597 conn, current->comm, current->pid); 598 /* 599 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 600 * before initial PDU processing in iscsi_target_start_negotiation() 601 * has completed, go ahead and retry until it's cleared. 602 * 603 * Otherwise if the TCP connection drops while this is occuring, 604 * iscsi_target_start_negotiation() will detect the failure, call 605 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 606 * remaining iscsi connection resources from iscsi_np process context. 607 */ 608 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 609 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 610 return; 611 } 612 613 spin_lock(&tpg->tpg_state_lock); 614 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 615 spin_unlock(&tpg->tpg_state_lock); 616 617 if (!state) { 618 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 619 goto err; 620 } 621 622 if (iscsi_target_sk_check_close(conn)) { 623 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 624 goto err; 625 } 626 627 conn->login_kworker = current; 628 allow_signal(SIGINT); 629 630 timeout.conn = conn; 631 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0); 632 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 633 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid); 634 635 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 636 del_timer_sync(&timeout.timer); 637 destroy_timer_on_stack(&timeout.timer); 638 flush_signals(current); 639 conn->login_kworker = NULL; 640 641 if (rc < 0) 642 goto err; 643 644 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 645 conn, current->comm, current->pid); 646 647 rc = iscsi_target_do_login(conn, login); 648 if (rc < 0) { 649 goto err; 650 } else if (!rc) { 651 if (iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_READ_ACTIVE)) 652 goto err; 653 } else if (rc == 1) { 654 iscsi_target_nego_release(conn); 655 iscsi_post_login_handler(np, conn, zero_tsih); 656 iscsit_deaccess_np(np, tpg, tpg_np); 657 } 658 return; 659 660 err: 661 iscsi_target_restore_sock_callbacks(conn); 662 iscsi_target_login_drop(conn, login); 663 iscsit_deaccess_np(np, tpg, tpg_np); 664 } 665 666 static void iscsi_target_sk_state_change(struct sock *sk) 667 { 668 struct iscsi_conn *conn; 669 void (*orig_state_change)(struct sock *); 670 bool state; 671 672 pr_debug("Entering iscsi_target_sk_state_change\n"); 673 674 write_lock_bh(&sk->sk_callback_lock); 675 conn = sk->sk_user_data; 676 if (!conn) { 677 write_unlock_bh(&sk->sk_callback_lock); 678 return; 679 } 680 orig_state_change = conn->orig_state_change; 681 682 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 683 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 684 conn); 685 write_unlock_bh(&sk->sk_callback_lock); 686 orig_state_change(sk); 687 return; 688 } 689 state = __iscsi_target_sk_check_close(sk); 690 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 691 692 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 693 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1 sk_state_change" 694 " conn: %p\n", conn); 695 if (state) 696 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 697 write_unlock_bh(&sk->sk_callback_lock); 698 orig_state_change(sk); 699 return; 700 } 701 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 702 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 703 conn); 704 write_unlock_bh(&sk->sk_callback_lock); 705 orig_state_change(sk); 706 return; 707 } 708 /* 709 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 710 * but only queue conn->login_work -> iscsi_target_do_login_rx() 711 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 712 * 713 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 714 * will detect the dropped TCP connection from delayed workqueue context. 715 * 716 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 717 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 718 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 719 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 720 * dropped TCP connection in iscsi_np process context, and cleaning up 721 * the remaining iscsi connection resources. 722 */ 723 if (state) { 724 pr_debug("iscsi_target_sk_state_change got failed state\n"); 725 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 726 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 727 write_unlock_bh(&sk->sk_callback_lock); 728 729 orig_state_change(sk); 730 731 if (!state) 732 schedule_delayed_work(&conn->login_work, 0); 733 return; 734 } 735 write_unlock_bh(&sk->sk_callback_lock); 736 737 orig_state_change(sk); 738 } 739 740 /* 741 * NOTE: We check for existing sessions or connections AFTER the initiator 742 * has been successfully authenticated in order to protect against faked 743 * ISID/TSIH combinations. 744 */ 745 static int iscsi_target_check_for_existing_instances( 746 struct iscsi_conn *conn, 747 struct iscsi_login *login) 748 { 749 if (login->checked_for_existing) 750 return 0; 751 752 login->checked_for_existing = 1; 753 754 if (!login->tsih) 755 return iscsi_check_for_session_reinstatement(conn); 756 else 757 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 758 login->initial_exp_statsn); 759 } 760 761 static int iscsi_target_do_authentication( 762 struct iscsi_conn *conn, 763 struct iscsi_login *login) 764 { 765 int authret; 766 u32 payload_length; 767 struct iscsi_param *param; 768 struct iscsi_login_req *login_req; 769 struct iscsi_login_rsp *login_rsp; 770 771 login_req = (struct iscsi_login_req *) login->req; 772 login_rsp = (struct iscsi_login_rsp *) login->rsp; 773 payload_length = ntoh24(login_req->dlength); 774 775 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 776 if (!param) 777 return -1; 778 779 authret = iscsi_handle_authentication( 780 conn, 781 login->req_buf, 782 login->rsp_buf, 783 payload_length, 784 &login->rsp_length, 785 param->value); 786 switch (authret) { 787 case 0: 788 pr_debug("Received OK response" 789 " from LIO Authentication, continuing.\n"); 790 break; 791 case 1: 792 pr_debug("iSCSI security negotiation" 793 " completed successfully.\n"); 794 login->auth_complete = 1; 795 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 796 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 797 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 798 ISCSI_FLAG_LOGIN_TRANSIT); 799 login->current_stage = 1; 800 } 801 return iscsi_target_check_for_existing_instances( 802 conn, login); 803 case 2: 804 pr_err("Security negotiation" 805 " failed.\n"); 806 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 807 ISCSI_LOGIN_STATUS_AUTH_FAILED); 808 return -1; 809 default: 810 pr_err("Received unknown error %d from LIO" 811 " Authentication\n", authret); 812 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 813 ISCSI_LOGIN_STATUS_TARGET_ERROR); 814 return -1; 815 } 816 817 return 0; 818 } 819 820 static int iscsi_target_handle_csg_zero( 821 struct iscsi_conn *conn, 822 struct iscsi_login *login) 823 { 824 int ret; 825 u32 payload_length; 826 struct iscsi_param *param; 827 struct iscsi_login_req *login_req; 828 struct iscsi_login_rsp *login_rsp; 829 830 login_req = (struct iscsi_login_req *) login->req; 831 login_rsp = (struct iscsi_login_rsp *) login->rsp; 832 payload_length = ntoh24(login_req->dlength); 833 834 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 835 if (!param) 836 return -1; 837 838 ret = iscsi_decode_text_input( 839 PHASE_SECURITY|PHASE_DECLARATIVE, 840 SENDER_INITIATOR|SENDER_RECEIVER, 841 login->req_buf, 842 payload_length, 843 conn); 844 if (ret < 0) 845 return -1; 846 847 if (ret > 0) { 848 if (login->auth_complete) { 849 pr_err("Initiator has already been" 850 " successfully authenticated, but is still" 851 " sending %s keys.\n", param->value); 852 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 853 ISCSI_LOGIN_STATUS_INIT_ERR); 854 return -1; 855 } 856 857 goto do_auth; 858 } else if (!payload_length) { 859 pr_err("Initiator sent zero length security payload," 860 " login failed\n"); 861 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 862 ISCSI_LOGIN_STATUS_AUTH_FAILED); 863 return -1; 864 } 865 866 if (login->first_request) 867 if (iscsi_target_check_first_request(conn, login) < 0) 868 return -1; 869 870 ret = iscsi_encode_text_output( 871 PHASE_SECURITY|PHASE_DECLARATIVE, 872 SENDER_TARGET, 873 login->rsp_buf, 874 &login->rsp_length, 875 conn->param_list, 876 conn->tpg->tpg_attrib.login_keys_workaround); 877 if (ret < 0) 878 return -1; 879 880 if (!iscsi_check_negotiated_keys(conn->param_list)) { 881 if (conn->tpg->tpg_attrib.authentication && 882 !strncmp(param->value, NONE, 4)) { 883 pr_err("Initiator sent AuthMethod=None but" 884 " Target is enforcing iSCSI Authentication," 885 " login failed.\n"); 886 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 887 ISCSI_LOGIN_STATUS_AUTH_FAILED); 888 return -1; 889 } 890 891 if (conn->tpg->tpg_attrib.authentication && 892 !login->auth_complete) 893 return 0; 894 895 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 896 return 0; 897 898 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 899 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 900 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 901 ISCSI_FLAG_LOGIN_TRANSIT; 902 login->current_stage = 1; 903 } 904 } 905 906 return 0; 907 do_auth: 908 return iscsi_target_do_authentication(conn, login); 909 } 910 911 static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 912 { 913 int ret; 914 u32 payload_length; 915 struct iscsi_login_req *login_req; 916 struct iscsi_login_rsp *login_rsp; 917 918 login_req = (struct iscsi_login_req *) login->req; 919 login_rsp = (struct iscsi_login_rsp *) login->rsp; 920 payload_length = ntoh24(login_req->dlength); 921 922 ret = iscsi_decode_text_input( 923 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 924 SENDER_INITIATOR|SENDER_RECEIVER, 925 login->req_buf, 926 payload_length, 927 conn); 928 if (ret < 0) { 929 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 930 ISCSI_LOGIN_STATUS_INIT_ERR); 931 return -1; 932 } 933 934 if (login->first_request) 935 if (iscsi_target_check_first_request(conn, login) < 0) 936 return -1; 937 938 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 939 return -1; 940 941 ret = iscsi_encode_text_output( 942 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 943 SENDER_TARGET, 944 login->rsp_buf, 945 &login->rsp_length, 946 conn->param_list, 947 conn->tpg->tpg_attrib.login_keys_workaround); 948 if (ret < 0) { 949 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 950 ISCSI_LOGIN_STATUS_INIT_ERR); 951 return -1; 952 } 953 954 if (!login->auth_complete && 955 conn->tpg->tpg_attrib.authentication) { 956 pr_err("Initiator is requesting CSG: 1, has not been" 957 " successfully authenticated, and the Target is" 958 " enforcing iSCSI Authentication, login failed.\n"); 959 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 960 ISCSI_LOGIN_STATUS_AUTH_FAILED); 961 return -1; 962 } 963 964 if (!iscsi_check_negotiated_keys(conn->param_list)) 965 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 966 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 967 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 968 ISCSI_FLAG_LOGIN_TRANSIT; 969 970 return 0; 971 } 972 973 static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 974 { 975 int pdu_count = 0; 976 struct iscsi_login_req *login_req; 977 struct iscsi_login_rsp *login_rsp; 978 979 login_req = (struct iscsi_login_req *) login->req; 980 login_rsp = (struct iscsi_login_rsp *) login->rsp; 981 982 while (1) { 983 if (++pdu_count > MAX_LOGIN_PDUS) { 984 pr_err("MAX_LOGIN_PDUS count reached.\n"); 985 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 986 ISCSI_LOGIN_STATUS_TARGET_ERROR); 987 return -1; 988 } 989 990 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 991 case 0: 992 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 993 if (iscsi_target_handle_csg_zero(conn, login) < 0) 994 return -1; 995 break; 996 case 1: 997 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 998 if (iscsi_target_handle_csg_one(conn, login) < 0) 999 return -1; 1000 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1001 /* 1002 * Check to make sure the TCP connection has not 1003 * dropped asynchronously while session reinstatement 1004 * was occuring in this kthread context, before 1005 * transitioning to full feature phase operation. 1006 */ 1007 if (iscsi_target_sk_check_close(conn)) 1008 return -1; 1009 1010 login->tsih = conn->sess->tsih; 1011 login->login_complete = 1; 1012 iscsi_target_restore_sock_callbacks(conn); 1013 if (iscsi_target_do_tx_login_io(conn, 1014 login) < 0) 1015 return -1; 1016 return 1; 1017 } 1018 break; 1019 default: 1020 pr_err("Illegal CSG: %d received from" 1021 " Initiator, protocol error.\n", 1022 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1023 break; 1024 } 1025 1026 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1027 return -1; 1028 1029 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1030 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1031 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1032 } 1033 break; 1034 } 1035 1036 return 0; 1037 } 1038 1039 static void iscsi_initiatorname_tolower( 1040 char *param_buf) 1041 { 1042 char *c; 1043 u32 iqn_size = strlen(param_buf), i; 1044 1045 for (i = 0; i < iqn_size; i++) { 1046 c = ¶m_buf[i]; 1047 if (!isupper(*c)) 1048 continue; 1049 1050 *c = tolower(*c); 1051 } 1052 } 1053 1054 /* 1055 * Processes the first Login Request.. 1056 */ 1057 int iscsi_target_locate_portal( 1058 struct iscsi_np *np, 1059 struct iscsi_conn *conn, 1060 struct iscsi_login *login) 1061 { 1062 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1063 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1064 struct iscsi_session *sess = conn->sess; 1065 struct iscsi_tiqn *tiqn; 1066 struct iscsi_tpg_np *tpg_np = NULL; 1067 struct iscsi_login_req *login_req; 1068 struct se_node_acl *se_nacl; 1069 u32 payload_length, queue_depth = 0; 1070 int sessiontype = 0, ret = 0, tag_num, tag_size; 1071 1072 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1073 iscsi_target_set_sock_callbacks(conn); 1074 1075 login->np = np; 1076 1077 login_req = (struct iscsi_login_req *) login->req; 1078 payload_length = ntoh24(login_req->dlength); 1079 1080 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1081 if (!tmpbuf) { 1082 pr_err("Unable to allocate memory for tmpbuf.\n"); 1083 return -1; 1084 } 1085 1086 memcpy(tmpbuf, login->req_buf, payload_length); 1087 tmpbuf[payload_length] = '\0'; 1088 start = tmpbuf; 1089 end = (start + payload_length); 1090 1091 /* 1092 * Locate the initial keys expected from the Initiator node in 1093 * the first login request in order to progress with the login phase. 1094 */ 1095 while (start < end) { 1096 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1097 ret = -1; 1098 goto out; 1099 } 1100 1101 if (!strncmp(key, "InitiatorName", 13)) 1102 i_buf = value; 1103 else if (!strncmp(key, "SessionType", 11)) 1104 s_buf = value; 1105 else if (!strncmp(key, "TargetName", 10)) 1106 t_buf = value; 1107 1108 start += strlen(key) + strlen(value) + 2; 1109 } 1110 /* 1111 * See 5.3. Login Phase. 1112 */ 1113 if (!i_buf) { 1114 pr_err("InitiatorName key not received" 1115 " in first login request.\n"); 1116 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1117 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1118 ret = -1; 1119 goto out; 1120 } 1121 /* 1122 * Convert the incoming InitiatorName to lowercase following 1123 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1124 * are NOT case sensitive. 1125 */ 1126 iscsi_initiatorname_tolower(i_buf); 1127 1128 if (!s_buf) { 1129 if (!login->leading_connection) 1130 goto get_target; 1131 1132 pr_err("SessionType key not received" 1133 " in first login request.\n"); 1134 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1135 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1136 ret = -1; 1137 goto out; 1138 } 1139 1140 /* 1141 * Use default portal group for discovery sessions. 1142 */ 1143 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1144 if (!sessiontype) { 1145 conn->tpg = iscsit_global->discovery_tpg; 1146 if (!login->leading_connection) 1147 goto get_target; 1148 1149 sess->sess_ops->SessionType = 1; 1150 /* 1151 * Setup crc32c modules from libcrypto 1152 */ 1153 if (iscsi_login_setup_crypto(conn) < 0) { 1154 pr_err("iscsi_login_setup_crypto() failed\n"); 1155 ret = -1; 1156 goto out; 1157 } 1158 /* 1159 * Serialize access across the discovery struct iscsi_portal_group to 1160 * process login attempt. 1161 */ 1162 if (iscsit_access_np(np, conn->tpg) < 0) { 1163 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1164 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1165 ret = -1; 1166 goto out; 1167 } 1168 ret = 0; 1169 goto alloc_tags; 1170 } 1171 1172 get_target: 1173 if (!t_buf) { 1174 pr_err("TargetName key not received" 1175 " in first login request while" 1176 " SessionType=Normal.\n"); 1177 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1178 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1179 ret = -1; 1180 goto out; 1181 } 1182 1183 /* 1184 * Locate Target IQN from Storage Node. 1185 */ 1186 tiqn = iscsit_get_tiqn_for_login(t_buf); 1187 if (!tiqn) { 1188 pr_err("Unable to locate Target IQN: %s in" 1189 " Storage Node\n", t_buf); 1190 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1191 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1192 ret = -1; 1193 goto out; 1194 } 1195 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1196 1197 /* 1198 * Locate Target Portal Group from Storage Node. 1199 */ 1200 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1201 if (!conn->tpg) { 1202 pr_err("Unable to locate Target Portal Group" 1203 " on %s\n", tiqn->tiqn); 1204 iscsit_put_tiqn_for_login(tiqn); 1205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1206 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1207 ret = -1; 1208 goto out; 1209 } 1210 conn->tpg_np = tpg_np; 1211 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1212 /* 1213 * Setup crc32c modules from libcrypto 1214 */ 1215 if (iscsi_login_setup_crypto(conn) < 0) { 1216 pr_err("iscsi_login_setup_crypto() failed\n"); 1217 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1218 iscsit_put_tiqn_for_login(tiqn); 1219 conn->tpg = NULL; 1220 ret = -1; 1221 goto out; 1222 } 1223 /* 1224 * Serialize access across the struct iscsi_portal_group to 1225 * process login attempt. 1226 */ 1227 if (iscsit_access_np(np, conn->tpg) < 0) { 1228 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1229 iscsit_put_tiqn_for_login(tiqn); 1230 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1231 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1232 conn->tpg = NULL; 1233 ret = -1; 1234 goto out; 1235 } 1236 1237 /* 1238 * conn->sess->node_acl will be set when the referenced 1239 * struct iscsi_session is located from received ISID+TSIH in 1240 * iscsi_login_non_zero_tsih_s2(). 1241 */ 1242 if (!login->leading_connection) { 1243 ret = 0; 1244 goto out; 1245 } 1246 1247 /* 1248 * This value is required in iscsi_login_zero_tsih_s2() 1249 */ 1250 sess->sess_ops->SessionType = 0; 1251 1252 /* 1253 * Locate incoming Initiator IQN reference from Storage Node. 1254 */ 1255 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1256 &conn->tpg->tpg_se_tpg, i_buf); 1257 if (!sess->se_sess->se_node_acl) { 1258 pr_err("iSCSI Initiator Node: %s is not authorized to" 1259 " access iSCSI target portal group: %hu.\n", 1260 i_buf, conn->tpg->tpgt); 1261 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1262 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1263 ret = -1; 1264 goto out; 1265 } 1266 se_nacl = sess->se_sess->se_node_acl; 1267 queue_depth = se_nacl->queue_depth; 1268 /* 1269 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1270 * depth for non immediate commands, plus extra tags for immediate 1271 * commands. 1272 * 1273 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1274 * in per-cpu-ida tag allocation logic + small queue_depth. 1275 */ 1276 alloc_tags: 1277 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1278 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1279 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1280 1281 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1282 if (ret < 0) { 1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1284 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1285 ret = -1; 1286 } 1287 out: 1288 kfree(tmpbuf); 1289 return ret; 1290 } 1291 1292 int iscsi_target_start_negotiation( 1293 struct iscsi_login *login, 1294 struct iscsi_conn *conn) 1295 { 1296 int ret; 1297 1298 if (conn->sock) { 1299 struct sock *sk = conn->sock->sk; 1300 1301 write_lock_bh(&sk->sk_callback_lock); 1302 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1303 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1304 write_unlock_bh(&sk->sk_callback_lock); 1305 } 1306 /* 1307 * If iscsi_target_do_login returns zero to signal more PDU 1308 * exchanges are required to complete the login, go ahead and 1309 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1310 * is still active. 1311 * 1312 * Otherwise if TCP connection dropped asynchronously, go ahead 1313 * and perform connection cleanup now. 1314 */ 1315 ret = iscsi_target_do_login(conn, login); 1316 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1317 ret = -1; 1318 1319 if (ret < 0) { 1320 cancel_delayed_work_sync(&conn->login_work); 1321 iscsi_target_restore_sock_callbacks(conn); 1322 iscsi_remove_failed_auth_entry(conn); 1323 } 1324 if (ret != 0) 1325 iscsi_target_nego_release(conn); 1326 1327 return ret; 1328 } 1329 1330 void iscsi_target_nego_release(struct iscsi_conn *conn) 1331 { 1332 struct iscsi_login *login = conn->conn_login; 1333 1334 if (!login) 1335 return; 1336 1337 kfree(login->req_buf); 1338 kfree(login->rsp_buf); 1339 kfree(login); 1340 1341 conn->conn_login = NULL; 1342 } 1343