1// SPDX-License-Identifier: GPL-2.0-or-later 2/******************************************************************************* 3 * This file contains main functions related to iSCSI Parameter negotiation. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 6 * 7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ******************************************************************************/ 10 11#include <linux/ctype.h> 12#include <linux/kthread.h> 13#include <linux/slab.h> 14#include <linux/sched/signal.h> 15#include <net/sock.h> 16#include <scsi/iscsi_proto.h> 17#include <target/target_core_base.h> 18#include <target/target_core_fabric.h> 19#include <target/iscsi/iscsi_transport.h> 20 21#include <target/iscsi/iscsi_target_core.h> 22#include "iscsi_target_parameters.h" 23#include "iscsi_target_login.h" 24#include "iscsi_target_nego.h" 25#include "iscsi_target_tpg.h" 26#include "iscsi_target_util.h" 27#include "iscsi_target.h" 28#include "iscsi_target_auth.h" 29 30#define MAX_LOGIN_PDUS 7 31#define TEXT_LEN 4096 32 33void convert_null_to_semi(char *buf, int len) 34{ 35 int i; 36 37 for (i = 0; i < len; i++) 38 if (buf[i] == '\0') 39 buf[i] = ';'; 40} 41 42static int strlen_semi(char *buf) 43{ 44 int i = 0; 45 46 while (buf[i] != '\0') { 47 if (buf[i] == ';') 48 return i; 49 i++; 50 } 51 52 return -1; 53} 54 55int extract_param( 56 const char *in_buf, 57 const char *pattern, 58 unsigned int max_length, 59 char *out_buf, 60 unsigned char *type) 61{ 62 char *ptr; 63 int len; 64 65 if (!in_buf || !pattern || !out_buf || !type) 66 return -1; 67 68 ptr = strstr(in_buf, pattern); 69 if (!ptr) 70 return -1; 71 72 ptr = strstr(ptr, "="); 73 if (!ptr) 74 return -1; 75 76 ptr += 1; 77 if (*ptr == '0' && (*(ptr+1) == 'x' || *(ptr+1) == 'X')) { 78 ptr += 2; /* skip 0x */ 79 *type = HEX; 80 } else 81 *type = DECIMAL; 82 83 len = strlen_semi(ptr); 84 if (len < 0) 85 return -1; 86 87 if (len >= max_length) { 88 pr_err("Length of input: %d exceeds max_length:" 89 " %d\n", len, max_length); 90 return -1; 91 } 92 memcpy(out_buf, ptr, len); 93 out_buf[len] = '\0'; 94 95 return 0; 96} 97 98static u32 iscsi_handle_authentication( 99 struct iscsi_conn *conn, 100 char *in_buf, 101 char *out_buf, 102 int in_length, 103 int *out_length, 104 unsigned char *authtype) 105{ 106 struct iscsi_session *sess = conn->sess; 107 struct iscsi_node_auth *auth; 108 struct iscsi_node_acl *iscsi_nacl; 109 struct iscsi_portal_group *iscsi_tpg; 110 struct se_node_acl *se_nacl; 111 112 if (!sess->sess_ops->SessionType) { 113 /* 114 * For SessionType=Normal 115 */ 116 se_nacl = conn->sess->se_sess->se_node_acl; 117 if (!se_nacl) { 118 pr_err("Unable to locate struct se_node_acl for" 119 " CHAP auth\n"); 120 return -1; 121 } 122 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 123 se_node_acl); 124 if (!iscsi_nacl) { 125 pr_err("Unable to locate struct iscsi_node_acl for" 126 " CHAP auth\n"); 127 return -1; 128 } 129 130 if (se_nacl->dynamic_node_acl) { 131 iscsi_tpg = container_of(se_nacl->se_tpg, 132 struct iscsi_portal_group, tpg_se_tpg); 133 134 auth = &iscsi_tpg->tpg_demo_auth; 135 } else { 136 iscsi_nacl = container_of(se_nacl, struct iscsi_node_acl, 137 se_node_acl); 138 139 auth = &iscsi_nacl->node_auth; 140 } 141 } else { 142 /* 143 * For SessionType=Discovery 144 */ 145 auth = &iscsit_global->discovery_acl.node_auth; 146 } 147 148 if (strstr("CHAP", authtype)) 149 strcpy(conn->sess->auth_type, "CHAP"); 150 else 151 strcpy(conn->sess->auth_type, NONE); 152 153 if (strstr("None", authtype)) 154 return 1; 155 else if (strstr("CHAP", authtype)) 156 return chap_main_loop(conn, auth, in_buf, out_buf, 157 &in_length, out_length); 158 /* SRP, SPKM1, SPKM2 and KRB5 are unsupported */ 159 return 2; 160} 161 162static void iscsi_remove_failed_auth_entry(struct iscsi_conn *conn) 163{ 164 kfree(conn->auth_protocol); 165} 166 167int iscsi_target_check_login_request( 168 struct iscsi_conn *conn, 169 struct iscsi_login *login) 170{ 171 int req_csg, req_nsg; 172 u32 payload_length; 173 struct iscsi_login_req *login_req; 174 175 login_req = (struct iscsi_login_req *) login->req; 176 payload_length = ntoh24(login_req->dlength); 177 178 switch (login_req->opcode & ISCSI_OPCODE_MASK) { 179 case ISCSI_OP_LOGIN: 180 break; 181 default: 182 pr_err("Received unknown opcode 0x%02x.\n", 183 login_req->opcode & ISCSI_OPCODE_MASK); 184 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 185 ISCSI_LOGIN_STATUS_INIT_ERR); 186 return -1; 187 } 188 189 if ((login_req->flags & ISCSI_FLAG_LOGIN_CONTINUE) && 190 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 191 pr_err("Login request has both ISCSI_FLAG_LOGIN_CONTINUE" 192 " and ISCSI_FLAG_LOGIN_TRANSIT set, protocol error.\n"); 193 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 194 ISCSI_LOGIN_STATUS_INIT_ERR); 195 return -1; 196 } 197 198 req_csg = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 199 req_nsg = ISCSI_LOGIN_NEXT_STAGE(login_req->flags); 200 201 if (req_csg != login->current_stage) { 202 pr_err("Initiator unexpectedly changed login stage" 203 " from %d to %d, login failed.\n", login->current_stage, 204 req_csg); 205 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 206 ISCSI_LOGIN_STATUS_INIT_ERR); 207 return -1; 208 } 209 210 if ((req_nsg == 2) || (req_csg >= 2) || 211 ((login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT) && 212 (req_nsg <= req_csg))) { 213 pr_err("Illegal login_req->flags Combination, CSG: %d," 214 " NSG: %d, ISCSI_FLAG_LOGIN_TRANSIT: %d.\n", req_csg, 215 req_nsg, (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)); 216 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 217 ISCSI_LOGIN_STATUS_INIT_ERR); 218 return -1; 219 } 220 221 if ((login_req->max_version != login->version_max) || 222 (login_req->min_version != login->version_min)) { 223 pr_err("Login request changed Version Max/Nin" 224 " unexpectedly to 0x%02x/0x%02x, protocol error\n", 225 login_req->max_version, login_req->min_version); 226 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 227 ISCSI_LOGIN_STATUS_INIT_ERR); 228 return -1; 229 } 230 231 if (memcmp(login_req->isid, login->isid, 6) != 0) { 232 pr_err("Login request changed ISID unexpectedly," 233 " protocol error.\n"); 234 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 235 ISCSI_LOGIN_STATUS_INIT_ERR); 236 return -1; 237 } 238 239 if (login_req->itt != login->init_task_tag) { 240 pr_err("Login request changed ITT unexpectedly to" 241 " 0x%08x, protocol error.\n", login_req->itt); 242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 243 ISCSI_LOGIN_STATUS_INIT_ERR); 244 return -1; 245 } 246 247 if (payload_length > MAX_KEY_VALUE_PAIRS) { 248 pr_err("Login request payload exceeds default" 249 " MaxRecvDataSegmentLength: %u, protocol error.\n", 250 MAX_KEY_VALUE_PAIRS); 251 return -1; 252 } 253 254 return 0; 255} 256EXPORT_SYMBOL(iscsi_target_check_login_request); 257 258static int iscsi_target_check_first_request( 259 struct iscsi_conn *conn, 260 struct iscsi_login *login) 261{ 262 struct iscsi_param *param = NULL; 263 struct se_node_acl *se_nacl; 264 265 login->first_request = 0; 266 267 list_for_each_entry(param, &conn->param_list->param_list, p_list) { 268 if (!strncmp(param->name, SESSIONTYPE, 11)) { 269 if (!IS_PSTATE_ACCEPTOR(param)) { 270 pr_err("SessionType key not received" 271 " in first login request.\n"); 272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 273 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 274 return -1; 275 } 276 if (!strncmp(param->value, DISCOVERY, 9)) 277 return 0; 278 } 279 280 if (!strncmp(param->name, INITIATORNAME, 13)) { 281 if (!IS_PSTATE_ACCEPTOR(param)) { 282 if (!login->leading_connection) 283 continue; 284 285 pr_err("InitiatorName 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 } 291 292 /* 293 * For non-leading connections, double check that the 294 * received InitiatorName matches the existing session's 295 * struct iscsi_node_acl. 296 */ 297 if (!login->leading_connection) { 298 se_nacl = conn->sess->se_sess->se_node_acl; 299 if (!se_nacl) { 300 pr_err("Unable to locate" 301 " struct se_node_acl\n"); 302 iscsit_tx_login_rsp(conn, 303 ISCSI_STATUS_CLS_INITIATOR_ERR, 304 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 305 return -1; 306 } 307 308 if (strcmp(param->value, 309 se_nacl->initiatorname)) { 310 pr_err("Incorrect" 311 " InitiatorName: %s for this" 312 " iSCSI Initiator Node.\n", 313 param->value); 314 iscsit_tx_login_rsp(conn, 315 ISCSI_STATUS_CLS_INITIATOR_ERR, 316 ISCSI_LOGIN_STATUS_TGT_NOT_FOUND); 317 return -1; 318 } 319 } 320 } 321 } 322 323 return 0; 324} 325 326static int iscsi_target_do_tx_login_io(struct iscsi_conn *conn, struct iscsi_login *login) 327{ 328 u32 padding = 0; 329 struct iscsi_login_rsp *login_rsp; 330 331 login_rsp = (struct iscsi_login_rsp *) login->rsp; 332 333 login_rsp->opcode = ISCSI_OP_LOGIN_RSP; 334 hton24(login_rsp->dlength, login->rsp_length); 335 memcpy(login_rsp->isid, login->isid, 6); 336 login_rsp->tsih = cpu_to_be16(login->tsih); 337 login_rsp->itt = login->init_task_tag; 338 login_rsp->statsn = cpu_to_be32(conn->stat_sn++); 339 login_rsp->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 340 login_rsp->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 341 342 pr_debug("Sending Login Response, Flags: 0x%02x, ITT: 0x%08x," 343 " ExpCmdSN; 0x%08x, MaxCmdSN: 0x%08x, StatSN: 0x%08x, Length:" 344 " %u\n", login_rsp->flags, (__force u32)login_rsp->itt, 345 ntohl(login_rsp->exp_cmdsn), ntohl(login_rsp->max_cmdsn), 346 ntohl(login_rsp->statsn), login->rsp_length); 347 348 padding = ((-login->rsp_length) & 3); 349 /* 350 * Before sending the last login response containing the transition 351 * bit for full-feature-phase, go ahead and start up TX/RX threads 352 * now to avoid potential resource allocation failures after the 353 * final login response has been sent. 354 */ 355 if (login->login_complete) { 356 int rc = iscsit_start_kthreads(conn); 357 if (rc) { 358 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 359 ISCSI_LOGIN_STATUS_NO_RESOURCES); 360 return -1; 361 } 362 } 363 364 if (conn->conn_transport->iscsit_put_login_tx(conn, login, 365 login->rsp_length + padding) < 0) 366 goto err; 367 368 login->rsp_length = 0; 369 370 return 0; 371 372err: 373 if (login->login_complete) { 374 if (conn->rx_thread && conn->rx_thread_active) { 375 send_sig(SIGINT, conn->rx_thread, 1); 376 complete(&conn->rx_login_comp); 377 kthread_stop(conn->rx_thread); 378 } 379 if (conn->tx_thread && conn->tx_thread_active) { 380 send_sig(SIGINT, conn->tx_thread, 1); 381 kthread_stop(conn->tx_thread); 382 } 383 spin_lock(&iscsit_global->ts_bitmap_lock); 384 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 385 get_order(1)); 386 spin_unlock(&iscsit_global->ts_bitmap_lock); 387 } 388 return -1; 389} 390 391static void iscsi_target_sk_data_ready(struct sock *sk) 392{ 393 struct iscsi_conn *conn = sk->sk_user_data; 394 bool rc; 395 396 pr_debug("Entering iscsi_target_sk_data_ready: conn: %p\n", conn); 397 398 write_lock_bh(&sk->sk_callback_lock); 399 if (!sk->sk_user_data) { 400 write_unlock_bh(&sk->sk_callback_lock); 401 return; 402 } 403 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 404 write_unlock_bh(&sk->sk_callback_lock); 405 pr_debug("Got LOGIN_FLAGS_READY=0, conn: %p >>>>\n", conn); 406 return; 407 } 408 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 409 write_unlock_bh(&sk->sk_callback_lock); 410 pr_debug("Got LOGIN_FLAGS_CLOSED=1, conn: %p >>>>\n", conn); 411 return; 412 } 413 if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) { 414 write_unlock_bh(&sk->sk_callback_lock); 415 pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn); 416 if (iscsi_target_sk_data_ready == conn->orig_data_ready) 417 return; 418 conn->orig_data_ready(sk); 419 return; 420 } 421 422 rc = schedule_delayed_work(&conn->login_work, 0); 423 if (!rc) { 424 pr_debug("iscsi_target_sk_data_ready, schedule_delayed_work" 425 " got false\n"); 426 } 427 write_unlock_bh(&sk->sk_callback_lock); 428} 429 430static void iscsi_target_sk_state_change(struct sock *); 431 432static void iscsi_target_set_sock_callbacks(struct iscsi_conn *conn) 433{ 434 struct sock *sk; 435 436 if (!conn->sock) 437 return; 438 439 sk = conn->sock->sk; 440 pr_debug("Entering iscsi_target_set_sock_callbacks: conn: %p\n", conn); 441 442 write_lock_bh(&sk->sk_callback_lock); 443 sk->sk_user_data = conn; 444 conn->orig_data_ready = sk->sk_data_ready; 445 conn->orig_state_change = sk->sk_state_change; 446 sk->sk_data_ready = iscsi_target_sk_data_ready; 447 sk->sk_state_change = iscsi_target_sk_state_change; 448 write_unlock_bh(&sk->sk_callback_lock); 449 450 sk->sk_sndtimeo = TA_LOGIN_TIMEOUT * HZ; 451 sk->sk_rcvtimeo = TA_LOGIN_TIMEOUT * HZ; 452} 453 454static void iscsi_target_restore_sock_callbacks(struct iscsi_conn *conn) 455{ 456 struct sock *sk; 457 458 if (!conn->sock) 459 return; 460 461 sk = conn->sock->sk; 462 pr_debug("Entering iscsi_target_restore_sock_callbacks: conn: %p\n", conn); 463 464 write_lock_bh(&sk->sk_callback_lock); 465 if (!sk->sk_user_data) { 466 write_unlock_bh(&sk->sk_callback_lock); 467 return; 468 } 469 sk->sk_user_data = NULL; 470 sk->sk_data_ready = conn->orig_data_ready; 471 sk->sk_state_change = conn->orig_state_change; 472 write_unlock_bh(&sk->sk_callback_lock); 473 474 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 475 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 476} 477 478static int iscsi_target_do_login(struct iscsi_conn *, struct iscsi_login *); 479 480static bool __iscsi_target_sk_check_close(struct sock *sk) 481{ 482 if (sk->sk_state == TCP_CLOSE_WAIT || sk->sk_state == TCP_CLOSE) { 483 pr_debug("__iscsi_target_sk_check_close: TCP_CLOSE_WAIT|TCP_CLOSE," 484 "returning TRUE\n"); 485 return true; 486 } 487 return false; 488} 489 490static bool iscsi_target_sk_check_close(struct iscsi_conn *conn) 491{ 492 bool state = false; 493 494 if (conn->sock) { 495 struct sock *sk = conn->sock->sk; 496 497 read_lock_bh(&sk->sk_callback_lock); 498 state = (__iscsi_target_sk_check_close(sk) || 499 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 500 read_unlock_bh(&sk->sk_callback_lock); 501 } 502 return state; 503} 504 505static bool iscsi_target_sk_check_flag(struct iscsi_conn *conn, unsigned int flag) 506{ 507 bool state = false; 508 509 if (conn->sock) { 510 struct sock *sk = conn->sock->sk; 511 512 read_lock_bh(&sk->sk_callback_lock); 513 state = test_bit(flag, &conn->login_flags); 514 read_unlock_bh(&sk->sk_callback_lock); 515 } 516 return state; 517} 518 519static bool iscsi_target_sk_check_and_clear(struct iscsi_conn *conn, unsigned int flag) 520{ 521 bool state = false; 522 523 if (conn->sock) { 524 struct sock *sk = conn->sock->sk; 525 526 write_lock_bh(&sk->sk_callback_lock); 527 state = (__iscsi_target_sk_check_close(sk) || 528 test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)); 529 if (!state) 530 clear_bit(flag, &conn->login_flags); 531 write_unlock_bh(&sk->sk_callback_lock); 532 } 533 return state; 534} 535 536static void iscsi_target_login_drop(struct iscsi_conn *conn, struct iscsi_login *login) 537{ 538 bool zero_tsih = login->zero_tsih; 539 540 iscsi_remove_failed_auth_entry(conn); 541 iscsi_target_nego_release(conn); 542 iscsi_target_login_sess_out(conn, zero_tsih, true); 543} 544 545struct conn_timeout { 546 struct timer_list timer; 547 struct iscsi_conn *conn; 548}; 549 550static void iscsi_target_login_timeout(struct timer_list *t) 551{ 552 struct conn_timeout *timeout = from_timer(timeout, t, timer); 553 struct iscsi_conn *conn = timeout->conn; 554 555 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 556 557 if (conn->login_kworker) { 558 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 559 conn->login_kworker->comm, conn->login_kworker->pid); 560 send_sig(SIGINT, conn->login_kworker, 1); 561 } 562} 563 564static void iscsi_target_do_login_rx(struct work_struct *work) 565{ 566 struct iscsi_conn *conn = container_of(work, 567 struct iscsi_conn, login_work.work); 568 struct iscsi_login *login = conn->login; 569 struct iscsi_np *np = login->np; 570 struct iscsi_portal_group *tpg = conn->tpg; 571 struct iscsi_tpg_np *tpg_np = conn->tpg_np; 572 struct conn_timeout timeout; 573 int rc, zero_tsih = login->zero_tsih; 574 bool state; 575 576 pr_debug("entering iscsi_target_do_login_rx, conn: %p, %s:%d\n", 577 conn, current->comm, current->pid); 578 /* 579 * If iscsi_target_do_login_rx() has been invoked by ->sk_data_ready() 580 * before initial PDU processing in iscsi_target_start_negotiation() 581 * has completed, go ahead and retry until it's cleared. 582 * 583 * Otherwise if the TCP connection drops while this is occuring, 584 * iscsi_target_start_negotiation() will detect the failure, call 585 * cancel_delayed_work_sync(&conn->login_work), and cleanup the 586 * remaining iscsi connection resources from iscsi_np process context. 587 */ 588 if (iscsi_target_sk_check_flag(conn, LOGIN_FLAGS_INITIAL_PDU)) { 589 schedule_delayed_work(&conn->login_work, msecs_to_jiffies(10)); 590 return; 591 } 592 593 spin_lock(&tpg->tpg_state_lock); 594 state = (tpg->tpg_state == TPG_STATE_ACTIVE); 595 spin_unlock(&tpg->tpg_state_lock); 596 597 if (!state) { 598 pr_debug("iscsi_target_do_login_rx: tpg_state != TPG_STATE_ACTIVE\n"); 599 goto err; 600 } 601 602 if (iscsi_target_sk_check_close(conn)) { 603 pr_debug("iscsi_target_do_login_rx, TCP state CLOSE\n"); 604 goto err; 605 } 606 607 conn->login_kworker = current; 608 allow_signal(SIGINT); 609 610 timeout.conn = conn; 611 timer_setup_on_stack(&timeout.timer, iscsi_target_login_timeout, 0); 612 mod_timer(&timeout.timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 613 pr_debug("Starting login timer for %s/%d\n", current->comm, current->pid); 614 615 rc = conn->conn_transport->iscsit_get_login_rx(conn, login); 616 del_timer_sync(&timeout.timer); 617 destroy_timer_on_stack(&timeout.timer); 618 flush_signals(current); 619 conn->login_kworker = NULL; 620 621 if (rc < 0) 622 goto err; 623 624 pr_debug("iscsi_target_do_login_rx after rx_login_io, %p, %s:%d\n", 625 conn, current->comm, current->pid); 626 627 /* 628 * LOGIN_FLAGS_READ_ACTIVE is cleared so that sk_data_ready 629 * could be triggered again after this. 630 * 631 * LOGIN_FLAGS_WRITE_ACTIVE is cleared after we successfully 632 * process a login PDU, so that sk_state_chage can do login 633 * cleanup as needed if the socket is closed. If a delayed work is 634 * ongoing (LOGIN_FLAGS_WRITE_ACTIVE or LOGIN_FLAGS_READ_ACTIVE), 635 * sk_state_change will leave the cleanup to the delayed work or 636 * it will schedule a delayed work to do cleanup. 637 */ 638 if (conn->sock) { 639 struct sock *sk = conn->sock->sk; 640 641 write_lock_bh(&sk->sk_callback_lock); 642 if (!test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags)) { 643 clear_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags); 644 set_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags); 645 } 646 write_unlock_bh(&sk->sk_callback_lock); 647 } 648 649 rc = iscsi_target_do_login(conn, login); 650 if (rc < 0) { 651 goto err; 652 } else if (!rc) { 653 if (iscsi_target_sk_check_and_clear(conn, 654 LOGIN_FLAGS_WRITE_ACTIVE)) 655 goto err; 656 } else if (rc == 1) { 657 cancel_delayed_work(&conn->login_work); 658 iscsi_target_nego_release(conn); 659 iscsi_post_login_handler(np, conn, zero_tsih); 660 iscsit_deaccess_np(np, tpg, tpg_np); 661 } 662 return; 663 664err: 665 iscsi_target_restore_sock_callbacks(conn); 666 cancel_delayed_work(&conn->login_work); 667 iscsi_target_login_drop(conn, login); 668 iscsit_deaccess_np(np, tpg, tpg_np); 669} 670 671static void iscsi_target_sk_state_change(struct sock *sk) 672{ 673 struct iscsi_conn *conn; 674 void (*orig_state_change)(struct sock *); 675 bool state; 676 677 pr_debug("Entering iscsi_target_sk_state_change\n"); 678 679 write_lock_bh(&sk->sk_callback_lock); 680 conn = sk->sk_user_data; 681 if (!conn) { 682 write_unlock_bh(&sk->sk_callback_lock); 683 return; 684 } 685 orig_state_change = conn->orig_state_change; 686 687 if (!test_bit(LOGIN_FLAGS_READY, &conn->login_flags)) { 688 pr_debug("Got LOGIN_FLAGS_READY=0 sk_state_change conn: %p\n", 689 conn); 690 write_unlock_bh(&sk->sk_callback_lock); 691 orig_state_change(sk); 692 return; 693 } 694 state = __iscsi_target_sk_check_close(sk); 695 pr_debug("__iscsi_target_sk_close_change: state: %d\n", state); 696 697 if (test_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags) || 698 test_bit(LOGIN_FLAGS_WRITE_ACTIVE, &conn->login_flags)) { 699 pr_debug("Got LOGIN_FLAGS_{READ|WRITE}_ACTIVE=1" 700 " sk_state_change conn: %p\n", conn); 701 if (state) 702 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 703 write_unlock_bh(&sk->sk_callback_lock); 704 orig_state_change(sk); 705 return; 706 } 707 if (test_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags)) { 708 pr_debug("Got LOGIN_FLAGS_CLOSED=1 sk_state_change conn: %p\n", 709 conn); 710 write_unlock_bh(&sk->sk_callback_lock); 711 orig_state_change(sk); 712 return; 713 } 714 /* 715 * If the TCP connection has dropped, go ahead and set LOGIN_FLAGS_CLOSED, 716 * but only queue conn->login_work -> iscsi_target_do_login_rx() 717 * processing if LOGIN_FLAGS_INITIAL_PDU has already been cleared. 718 * 719 * When iscsi_target_do_login_rx() runs, iscsi_target_sk_check_close() 720 * will detect the dropped TCP connection from delayed workqueue context. 721 * 722 * If LOGIN_FLAGS_INITIAL_PDU is still set, which means the initial 723 * iscsi_target_start_negotiation() is running, iscsi_target_do_login() 724 * via iscsi_target_sk_check_close() or iscsi_target_start_negotiation() 725 * via iscsi_target_sk_check_and_clear() is responsible for detecting the 726 * dropped TCP connection in iscsi_np process context, and cleaning up 727 * the remaining iscsi connection resources. 728 */ 729 if (state) { 730 pr_debug("iscsi_target_sk_state_change got failed state\n"); 731 set_bit(LOGIN_FLAGS_CLOSED, &conn->login_flags); 732 state = test_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 733 write_unlock_bh(&sk->sk_callback_lock); 734 735 orig_state_change(sk); 736 737 if (!state) 738 schedule_delayed_work(&conn->login_work, 0); 739 return; 740 } 741 write_unlock_bh(&sk->sk_callback_lock); 742 743 orig_state_change(sk); 744} 745 746/* 747 * NOTE: We check for existing sessions or connections AFTER the initiator 748 * has been successfully authenticated in order to protect against faked 749 * ISID/TSIH combinations. 750 */ 751static int iscsi_target_check_for_existing_instances( 752 struct iscsi_conn *conn, 753 struct iscsi_login *login) 754{ 755 if (login->checked_for_existing) 756 return 0; 757 758 login->checked_for_existing = 1; 759 760 if (!login->tsih) 761 return iscsi_check_for_session_reinstatement(conn); 762 else 763 return iscsi_login_post_auth_non_zero_tsih(conn, login->cid, 764 login->initial_exp_statsn); 765} 766 767static int iscsi_target_do_authentication( 768 struct iscsi_conn *conn, 769 struct iscsi_login *login) 770{ 771 int authret; 772 u32 payload_length; 773 struct iscsi_param *param; 774 struct iscsi_login_req *login_req; 775 struct iscsi_login_rsp *login_rsp; 776 777 login_req = (struct iscsi_login_req *) login->req; 778 login_rsp = (struct iscsi_login_rsp *) login->rsp; 779 payload_length = ntoh24(login_req->dlength); 780 781 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 782 if (!param) 783 return -1; 784 785 authret = iscsi_handle_authentication( 786 conn, 787 login->req_buf, 788 login->rsp_buf, 789 payload_length, 790 &login->rsp_length, 791 param->value); 792 switch (authret) { 793 case 0: 794 pr_debug("Received OK response" 795 " from LIO Authentication, continuing.\n"); 796 break; 797 case 1: 798 pr_debug("iSCSI security negotiation" 799 " completed successfully.\n"); 800 login->auth_complete = 1; 801 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 802 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 803 login_rsp->flags |= (ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 804 ISCSI_FLAG_LOGIN_TRANSIT); 805 login->current_stage = 1; 806 } 807 return iscsi_target_check_for_existing_instances( 808 conn, login); 809 case 2: 810 pr_err("Security negotiation" 811 " failed.\n"); 812 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 813 ISCSI_LOGIN_STATUS_AUTH_FAILED); 814 return -1; 815 default: 816 pr_err("Received unknown error %d from LIO" 817 " Authentication\n", authret); 818 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 819 ISCSI_LOGIN_STATUS_TARGET_ERROR); 820 return -1; 821 } 822 823 return 0; 824} 825 826static int iscsi_target_handle_csg_zero( 827 struct iscsi_conn *conn, 828 struct iscsi_login *login) 829{ 830 int ret; 831 u32 payload_length; 832 struct iscsi_param *param; 833 struct iscsi_login_req *login_req; 834 struct iscsi_login_rsp *login_rsp; 835 836 login_req = (struct iscsi_login_req *) login->req; 837 login_rsp = (struct iscsi_login_rsp *) login->rsp; 838 payload_length = ntoh24(login_req->dlength); 839 840 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list); 841 if (!param) 842 return -1; 843 844 ret = iscsi_decode_text_input( 845 PHASE_SECURITY|PHASE_DECLARATIVE, 846 SENDER_INITIATOR|SENDER_RECEIVER, 847 login->req_buf, 848 payload_length, 849 conn); 850 if (ret < 0) 851 return -1; 852 853 if (ret > 0) { 854 if (login->auth_complete) { 855 pr_err("Initiator has already been" 856 " successfully authenticated, but is still" 857 " sending %s keys.\n", param->value); 858 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 859 ISCSI_LOGIN_STATUS_INIT_ERR); 860 return -1; 861 } 862 863 goto do_auth; 864 } else if (!payload_length) { 865 pr_err("Initiator sent zero length security payload," 866 " login failed\n"); 867 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 868 ISCSI_LOGIN_STATUS_AUTH_FAILED); 869 return -1; 870 } 871 872 if (login->first_request) 873 if (iscsi_target_check_first_request(conn, login) < 0) 874 return -1; 875 876 ret = iscsi_encode_text_output( 877 PHASE_SECURITY|PHASE_DECLARATIVE, 878 SENDER_TARGET, 879 login->rsp_buf, 880 &login->rsp_length, 881 conn->param_list, 882 conn->tpg->tpg_attrib.login_keys_workaround); 883 if (ret < 0) 884 return -1; 885 886 if (!iscsi_check_negotiated_keys(conn->param_list)) { 887 if (conn->tpg->tpg_attrib.authentication && 888 !strncmp(param->value, NONE, 4)) { 889 pr_err("Initiator sent AuthMethod=None but" 890 " Target is enforcing iSCSI Authentication," 891 " login failed.\n"); 892 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 893 ISCSI_LOGIN_STATUS_AUTH_FAILED); 894 return -1; 895 } 896 897 if (conn->tpg->tpg_attrib.authentication && 898 !login->auth_complete) 899 return 0; 900 901 if (strncmp(param->value, NONE, 4) && !login->auth_complete) 902 return 0; 903 904 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE1) && 905 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) { 906 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE1 | 907 ISCSI_FLAG_LOGIN_TRANSIT; 908 login->current_stage = 1; 909 } 910 } 911 912 return 0; 913do_auth: 914 return iscsi_target_do_authentication(conn, login); 915} 916 917static int iscsi_target_handle_csg_one(struct iscsi_conn *conn, struct iscsi_login *login) 918{ 919 int ret; 920 u32 payload_length; 921 struct iscsi_login_req *login_req; 922 struct iscsi_login_rsp *login_rsp; 923 924 login_req = (struct iscsi_login_req *) login->req; 925 login_rsp = (struct iscsi_login_rsp *) login->rsp; 926 payload_length = ntoh24(login_req->dlength); 927 928 ret = iscsi_decode_text_input( 929 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 930 SENDER_INITIATOR|SENDER_RECEIVER, 931 login->req_buf, 932 payload_length, 933 conn); 934 if (ret < 0) { 935 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 936 ISCSI_LOGIN_STATUS_INIT_ERR); 937 return -1; 938 } 939 940 if (login->first_request) 941 if (iscsi_target_check_first_request(conn, login) < 0) 942 return -1; 943 944 if (iscsi_target_check_for_existing_instances(conn, login) < 0) 945 return -1; 946 947 ret = iscsi_encode_text_output( 948 PHASE_OPERATIONAL|PHASE_DECLARATIVE, 949 SENDER_TARGET, 950 login->rsp_buf, 951 &login->rsp_length, 952 conn->param_list, 953 conn->tpg->tpg_attrib.login_keys_workaround); 954 if (ret < 0) { 955 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 956 ISCSI_LOGIN_STATUS_INIT_ERR); 957 return -1; 958 } 959 960 if (!login->auth_complete && 961 conn->tpg->tpg_attrib.authentication) { 962 pr_err("Initiator is requesting CSG: 1, has not been" 963 " successfully authenticated, and the Target is" 964 " enforcing iSCSI Authentication, login failed.\n"); 965 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 966 ISCSI_LOGIN_STATUS_AUTH_FAILED); 967 return -1; 968 } 969 970 if (!iscsi_check_negotiated_keys(conn->param_list)) 971 if ((login_req->flags & ISCSI_FLAG_LOGIN_NEXT_STAGE3) && 972 (login_req->flags & ISCSI_FLAG_LOGIN_TRANSIT)) 973 login_rsp->flags |= ISCSI_FLAG_LOGIN_NEXT_STAGE3 | 974 ISCSI_FLAG_LOGIN_TRANSIT; 975 976 return 0; 977} 978 979static int iscsi_target_do_login(struct iscsi_conn *conn, struct iscsi_login *login) 980{ 981 int pdu_count = 0; 982 struct iscsi_login_req *login_req; 983 struct iscsi_login_rsp *login_rsp; 984 985 login_req = (struct iscsi_login_req *) login->req; 986 login_rsp = (struct iscsi_login_rsp *) login->rsp; 987 988 while (1) { 989 if (++pdu_count > MAX_LOGIN_PDUS) { 990 pr_err("MAX_LOGIN_PDUS count reached.\n"); 991 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 992 ISCSI_LOGIN_STATUS_TARGET_ERROR); 993 return -1; 994 } 995 996 switch (ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)) { 997 case 0: 998 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK; 999 if (iscsi_target_handle_csg_zero(conn, login) < 0) 1000 return -1; 1001 break; 1002 case 1: 1003 login_rsp->flags |= ISCSI_FLAG_LOGIN_CURRENT_STAGE1; 1004 if (iscsi_target_handle_csg_one(conn, login) < 0) 1005 return -1; 1006 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1007 /* 1008 * Check to make sure the TCP connection has not 1009 * dropped asynchronously while session reinstatement 1010 * was occuring in this kthread context, before 1011 * transitioning to full feature phase operation. 1012 */ 1013 if (iscsi_target_sk_check_close(conn)) 1014 return -1; 1015 1016 login->tsih = conn->sess->tsih; 1017 login->login_complete = 1; 1018 iscsi_target_restore_sock_callbacks(conn); 1019 if (iscsi_target_do_tx_login_io(conn, 1020 login) < 0) 1021 return -1; 1022 return 1; 1023 } 1024 break; 1025 default: 1026 pr_err("Illegal CSG: %d received from" 1027 " Initiator, protocol error.\n", 1028 ISCSI_LOGIN_CURRENT_STAGE(login_req->flags)); 1029 break; 1030 } 1031 1032 if (iscsi_target_do_tx_login_io(conn, login) < 0) 1033 return -1; 1034 1035 if (login_rsp->flags & ISCSI_FLAG_LOGIN_TRANSIT) { 1036 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_TRANSIT; 1037 login_rsp->flags &= ~ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK; 1038 } 1039 break; 1040 } 1041 1042 return 0; 1043} 1044 1045static void iscsi_initiatorname_tolower( 1046 char *param_buf) 1047{ 1048 char *c; 1049 u32 iqn_size = strlen(param_buf), i; 1050 1051 for (i = 0; i < iqn_size; i++) { 1052 c = ¶m_buf[i]; 1053 if (!isupper(*c)) 1054 continue; 1055 1056 *c = tolower(*c); 1057 } 1058} 1059 1060/* 1061 * Processes the first Login Request.. 1062 */ 1063int iscsi_target_locate_portal( 1064 struct iscsi_np *np, 1065 struct iscsi_conn *conn, 1066 struct iscsi_login *login) 1067{ 1068 char *i_buf = NULL, *s_buf = NULL, *t_buf = NULL; 1069 char *tmpbuf, *start = NULL, *end = NULL, *key, *value; 1070 struct iscsi_session *sess = conn->sess; 1071 struct iscsi_tiqn *tiqn; 1072 struct iscsi_tpg_np *tpg_np = NULL; 1073 struct iscsi_login_req *login_req; 1074 struct se_node_acl *se_nacl; 1075 u32 payload_length, queue_depth = 0; 1076 int sessiontype = 0, ret = 0, tag_num, tag_size; 1077 1078 INIT_DELAYED_WORK(&conn->login_work, iscsi_target_do_login_rx); 1079 iscsi_target_set_sock_callbacks(conn); 1080 1081 login->np = np; 1082 conn->tpg = NULL; 1083 1084 login_req = (struct iscsi_login_req *) login->req; 1085 payload_length = ntoh24(login_req->dlength); 1086 1087 tmpbuf = kzalloc(payload_length + 1, GFP_KERNEL); 1088 if (!tmpbuf) { 1089 pr_err("Unable to allocate memory for tmpbuf.\n"); 1090 return -1; 1091 } 1092 1093 memcpy(tmpbuf, login->req_buf, payload_length); 1094 tmpbuf[payload_length] = '\0'; 1095 start = tmpbuf; 1096 end = (start + payload_length); 1097 1098 /* 1099 * Locate the initial keys expected from the Initiator node in 1100 * the first login request in order to progress with the login phase. 1101 */ 1102 while (start < end) { 1103 if (iscsi_extract_key_value(start, &key, &value) < 0) { 1104 ret = -1; 1105 goto out; 1106 } 1107 1108 if (!strncmp(key, "InitiatorName", 13)) 1109 i_buf = value; 1110 else if (!strncmp(key, "SessionType", 11)) 1111 s_buf = value; 1112 else if (!strncmp(key, "TargetName", 10)) 1113 t_buf = value; 1114 1115 start += strlen(key) + strlen(value) + 2; 1116 } 1117 /* 1118 * See 5.3. Login Phase. 1119 */ 1120 if (!i_buf) { 1121 pr_err("InitiatorName key not received" 1122 " in first login request.\n"); 1123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1124 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1125 ret = -1; 1126 goto out; 1127 } 1128 /* 1129 * Convert the incoming InitiatorName to lowercase following 1130 * RFC-3720 3.2.6.1. section c) that says that iSCSI IQNs 1131 * are NOT case sensitive. 1132 */ 1133 iscsi_initiatorname_tolower(i_buf); 1134 1135 if (!s_buf) { 1136 if (!login->leading_connection) 1137 goto get_target; 1138 1139 pr_err("SessionType key not received" 1140 " in first login request.\n"); 1141 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1142 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1143 ret = -1; 1144 goto out; 1145 } 1146 1147 /* 1148 * Use default portal group for discovery sessions. 1149 */ 1150 sessiontype = strncmp(s_buf, DISCOVERY, 9); 1151 if (!sessiontype) { 1152 if (!login->leading_connection) 1153 goto get_target; 1154 1155 sess->sess_ops->SessionType = 1; 1156 /* 1157 * Setup crc32c modules from libcrypto 1158 */ 1159 if (iscsi_login_setup_crypto(conn) < 0) { 1160 pr_err("iscsi_login_setup_crypto() failed\n"); 1161 ret = -1; 1162 goto out; 1163 } 1164 /* 1165 * Serialize access across the discovery struct iscsi_portal_group to 1166 * process login attempt. 1167 */ 1168 conn->tpg = iscsit_global->discovery_tpg; 1169 if (iscsit_access_np(np, conn->tpg) < 0) { 1170 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1171 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1172 conn->tpg = NULL; 1173 ret = -1; 1174 goto out; 1175 } 1176 ret = 0; 1177 goto alloc_tags; 1178 } 1179 1180get_target: 1181 if (!t_buf) { 1182 pr_err("TargetName key not received" 1183 " in first login request while" 1184 " SessionType=Normal.\n"); 1185 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1186 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 1187 ret = -1; 1188 goto out; 1189 } 1190 1191 /* 1192 * Locate Target IQN from Storage Node. 1193 */ 1194 tiqn = iscsit_get_tiqn_for_login(t_buf); 1195 if (!tiqn) { 1196 pr_err("Unable to locate Target IQN: %s in" 1197 " Storage Node\n", t_buf); 1198 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1199 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1200 ret = -1; 1201 goto out; 1202 } 1203 pr_debug("Located Storage Object: %s\n", tiqn->tiqn); 1204 1205 /* 1206 * Locate Target Portal Group from Storage Node. 1207 */ 1208 conn->tpg = iscsit_get_tpg_from_np(tiqn, np, &tpg_np); 1209 if (!conn->tpg) { 1210 pr_err("Unable to locate Target Portal Group" 1211 " on %s\n", tiqn->tiqn); 1212 iscsit_put_tiqn_for_login(tiqn); 1213 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1214 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1215 ret = -1; 1216 goto out; 1217 } 1218 conn->tpg_np = tpg_np; 1219 pr_debug("Located Portal Group Object: %hu\n", conn->tpg->tpgt); 1220 /* 1221 * Setup crc32c modules from libcrypto 1222 */ 1223 if (iscsi_login_setup_crypto(conn) < 0) { 1224 pr_err("iscsi_login_setup_crypto() failed\n"); 1225 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1226 iscsit_put_tiqn_for_login(tiqn); 1227 conn->tpg = NULL; 1228 ret = -1; 1229 goto out; 1230 } 1231 /* 1232 * Serialize access across the struct iscsi_portal_group to 1233 * process login attempt. 1234 */ 1235 if (iscsit_access_np(np, conn->tpg) < 0) { 1236 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 1237 iscsit_put_tiqn_for_login(tiqn); 1238 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1239 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1240 conn->tpg = NULL; 1241 ret = -1; 1242 goto out; 1243 } 1244 1245 /* 1246 * conn->sess->node_acl will be set when the referenced 1247 * struct iscsi_session is located from received ISID+TSIH in 1248 * iscsi_login_non_zero_tsih_s2(). 1249 */ 1250 if (!login->leading_connection) { 1251 ret = 0; 1252 goto out; 1253 } 1254 1255 /* 1256 * This value is required in iscsi_login_zero_tsih_s2() 1257 */ 1258 sess->sess_ops->SessionType = 0; 1259 1260 /* 1261 * Locate incoming Initiator IQN reference from Storage Node. 1262 */ 1263 sess->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1264 &conn->tpg->tpg_se_tpg, i_buf); 1265 if (!sess->se_sess->se_node_acl) { 1266 pr_err("iSCSI Initiator Node: %s is not authorized to" 1267 " access iSCSI target portal group: %hu.\n", 1268 i_buf, conn->tpg->tpgt); 1269 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1270 ISCSI_LOGIN_STATUS_TGT_FORBIDDEN); 1271 ret = -1; 1272 goto out; 1273 } 1274 se_nacl = sess->se_sess->se_node_acl; 1275 queue_depth = se_nacl->queue_depth; 1276 /* 1277 * Setup pre-allocated tags based upon allowed per NodeACL CmdSN 1278 * depth for non immediate commands, plus extra tags for immediate 1279 * commands. 1280 * 1281 * Also enforce a ISCSIT_MIN_TAGS to prevent unnecessary contention 1282 * in per-cpu-ida tag allocation logic + small queue_depth. 1283 */ 1284alloc_tags: 1285 tag_num = max_t(u32, ISCSIT_MIN_TAGS, queue_depth); 1286 tag_num = (tag_num * 2) + ISCSIT_EXTRA_TAGS; 1287 tag_size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 1288 1289 ret = transport_alloc_session_tags(sess->se_sess, tag_num, tag_size); 1290 if (ret < 0) { 1291 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1292 ISCSI_LOGIN_STATUS_NO_RESOURCES); 1293 ret = -1; 1294 } 1295out: 1296 kfree(tmpbuf); 1297 return ret; 1298} 1299 1300int iscsi_target_start_negotiation( 1301 struct iscsi_login *login, 1302 struct iscsi_conn *conn) 1303{ 1304 int ret; 1305 1306 if (conn->sock) { 1307 struct sock *sk = conn->sock->sk; 1308 1309 write_lock_bh(&sk->sk_callback_lock); 1310 set_bit(LOGIN_FLAGS_READY, &conn->login_flags); 1311 set_bit(LOGIN_FLAGS_INITIAL_PDU, &conn->login_flags); 1312 write_unlock_bh(&sk->sk_callback_lock); 1313 } 1314 /* 1315 * If iscsi_target_do_login returns zero to signal more PDU 1316 * exchanges are required to complete the login, go ahead and 1317 * clear LOGIN_FLAGS_INITIAL_PDU but only if the TCP connection 1318 * is still active. 1319 * 1320 * Otherwise if TCP connection dropped asynchronously, go ahead 1321 * and perform connection cleanup now. 1322 */ 1323 ret = iscsi_target_do_login(conn, login); 1324 if (!ret && iscsi_target_sk_check_and_clear(conn, LOGIN_FLAGS_INITIAL_PDU)) 1325 ret = -1; 1326 1327 if (ret < 0) { 1328 cancel_delayed_work_sync(&conn->login_work); 1329 iscsi_target_restore_sock_callbacks(conn); 1330 iscsi_remove_failed_auth_entry(conn); 1331 } 1332 if (ret != 0) 1333 iscsi_target_nego_release(conn); 1334 1335 return ret; 1336} 1337 1338void iscsi_target_nego_release(struct iscsi_conn *conn) 1339{ 1340 struct iscsi_login *login = conn->conn_login; 1341 1342 if (!login) 1343 return; 1344 1345 kfree(login->req_buf); 1346 kfree(login->rsp_buf); 1347 kfree(login); 1348 1349 conn->conn_login = NULL; 1350} 1351