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