1 /******************************************************************************* 2 * This file contains main functions related to the iSCSI Target Core Driver. 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/string.h> 20 #include <linux/kthread.h> 21 #include <linux/crypto.h> 22 #include <linux/completion.h> 23 #include <linux/module.h> 24 #include <linux/idr.h> 25 #include <asm/unaligned.h> 26 #include <scsi/scsi_device.h> 27 #include <scsi/iscsi_proto.h> 28 #include <scsi/scsi_tcq.h> 29 #include <target/target_core_base.h> 30 #include <target/target_core_fabric.h> 31 #include <target/target_core_configfs.h> 32 33 #include "iscsi_target_core.h" 34 #include "iscsi_target_parameters.h" 35 #include "iscsi_target_seq_pdu_list.h" 36 #include "iscsi_target_tq.h" 37 #include "iscsi_target_configfs.h" 38 #include "iscsi_target_datain_values.h" 39 #include "iscsi_target_erl0.h" 40 #include "iscsi_target_erl1.h" 41 #include "iscsi_target_erl2.h" 42 #include "iscsi_target_login.h" 43 #include "iscsi_target_tmr.h" 44 #include "iscsi_target_tpg.h" 45 #include "iscsi_target_util.h" 46 #include "iscsi_target.h" 47 #include "iscsi_target_device.h" 48 #include "iscsi_target_stat.h" 49 50 #include <target/iscsi/iscsi_transport.h> 51 52 static LIST_HEAD(g_tiqn_list); 53 static LIST_HEAD(g_np_list); 54 static DEFINE_SPINLOCK(tiqn_lock); 55 static DEFINE_MUTEX(np_lock); 56 57 static struct idr tiqn_idr; 58 struct idr sess_idr; 59 struct mutex auth_id_lock; 60 spinlock_t sess_idr_lock; 61 62 struct iscsit_global *iscsit_global; 63 64 struct kmem_cache *lio_qr_cache; 65 struct kmem_cache *lio_dr_cache; 66 struct kmem_cache *lio_ooo_cache; 67 struct kmem_cache *lio_r2t_cache; 68 69 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 70 struct iscsi_scsi_req *, u32); 71 72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 73 { 74 struct iscsi_tiqn *tiqn = NULL; 75 76 spin_lock(&tiqn_lock); 77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 78 if (!strcmp(tiqn->tiqn, buf)) { 79 80 spin_lock(&tiqn->tiqn_state_lock); 81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 82 tiqn->tiqn_access_count++; 83 spin_unlock(&tiqn->tiqn_state_lock); 84 spin_unlock(&tiqn_lock); 85 return tiqn; 86 } 87 spin_unlock(&tiqn->tiqn_state_lock); 88 } 89 } 90 spin_unlock(&tiqn_lock); 91 92 return NULL; 93 } 94 95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 96 { 97 spin_lock(&tiqn->tiqn_state_lock); 98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 100 spin_unlock(&tiqn->tiqn_state_lock); 101 return 0; 102 } 103 spin_unlock(&tiqn->tiqn_state_lock); 104 105 return -1; 106 } 107 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 109 { 110 spin_lock(&tiqn->tiqn_state_lock); 111 tiqn->tiqn_access_count--; 112 spin_unlock(&tiqn->tiqn_state_lock); 113 } 114 115 /* 116 * Note that IQN formatting is expected to be done in userspace, and 117 * no explict IQN format checks are done here. 118 */ 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 120 { 121 struct iscsi_tiqn *tiqn = NULL; 122 int ret; 123 124 if (strlen(buf) >= ISCSI_IQN_LEN) { 125 pr_err("Target IQN exceeds %d bytes\n", 126 ISCSI_IQN_LEN); 127 return ERR_PTR(-EINVAL); 128 } 129 130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 131 if (!tiqn) { 132 pr_err("Unable to allocate struct iscsi_tiqn\n"); 133 return ERR_PTR(-ENOMEM); 134 } 135 136 sprintf(tiqn->tiqn, "%s", buf); 137 INIT_LIST_HEAD(&tiqn->tiqn_list); 138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 139 spin_lock_init(&tiqn->tiqn_state_lock); 140 spin_lock_init(&tiqn->tiqn_tpg_lock); 141 spin_lock_init(&tiqn->sess_err_stats.lock); 142 spin_lock_init(&tiqn->login_stats.lock); 143 spin_lock_init(&tiqn->logout_stats.lock); 144 145 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 146 147 idr_preload(GFP_KERNEL); 148 spin_lock(&tiqn_lock); 149 150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 151 if (ret < 0) { 152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 153 spin_unlock(&tiqn_lock); 154 idr_preload_end(); 155 kfree(tiqn); 156 return ERR_PTR(ret); 157 } 158 tiqn->tiqn_index = ret; 159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 160 161 spin_unlock(&tiqn_lock); 162 idr_preload_end(); 163 164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 165 166 return tiqn; 167 168 } 169 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 171 { 172 /* 173 * Wait for accesses to said struct iscsi_tiqn to end. 174 */ 175 spin_lock(&tiqn->tiqn_state_lock); 176 while (tiqn->tiqn_access_count != 0) { 177 spin_unlock(&tiqn->tiqn_state_lock); 178 msleep(10); 179 spin_lock(&tiqn->tiqn_state_lock); 180 } 181 spin_unlock(&tiqn->tiqn_state_lock); 182 } 183 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 185 { 186 /* 187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 188 * while holding tiqn->tiqn_state_lock. This means that all subsequent 189 * attempts to access this struct iscsi_tiqn will fail from both transport 190 * fabric and control code paths. 191 */ 192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 193 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 194 return; 195 } 196 197 iscsit_wait_for_tiqn(tiqn); 198 199 spin_lock(&tiqn_lock); 200 list_del(&tiqn->tiqn_list); 201 idr_remove(&tiqn_idr, tiqn->tiqn_index); 202 spin_unlock(&tiqn_lock); 203 204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 205 tiqn->tiqn); 206 kfree(tiqn); 207 } 208 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 210 { 211 int ret; 212 /* 213 * Determine if the network portal is accepting storage traffic. 214 */ 215 spin_lock_bh(&np->np_thread_lock); 216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 217 spin_unlock_bh(&np->np_thread_lock); 218 return -1; 219 } 220 spin_unlock_bh(&np->np_thread_lock); 221 /* 222 * Determine if the portal group is accepting storage traffic. 223 */ 224 spin_lock_bh(&tpg->tpg_state_lock); 225 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 226 spin_unlock_bh(&tpg->tpg_state_lock); 227 return -1; 228 } 229 spin_unlock_bh(&tpg->tpg_state_lock); 230 231 /* 232 * Here we serialize access across the TIQN+TPG Tuple. 233 */ 234 ret = down_interruptible(&tpg->np_login_sem); 235 if ((ret != 0) || signal_pending(current)) 236 return -1; 237 238 spin_lock_bh(&tpg->tpg_state_lock); 239 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 240 spin_unlock_bh(&tpg->tpg_state_lock); 241 up(&tpg->np_login_sem); 242 return -1; 243 } 244 spin_unlock_bh(&tpg->tpg_state_lock); 245 246 return 0; 247 } 248 249 void iscsit_login_kref_put(struct kref *kref) 250 { 251 struct iscsi_tpg_np *tpg_np = container_of(kref, 252 struct iscsi_tpg_np, tpg_np_kref); 253 254 complete(&tpg_np->tpg_np_comp); 255 } 256 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 258 struct iscsi_tpg_np *tpg_np) 259 { 260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 261 262 up(&tpg->np_login_sem); 263 264 if (tpg_np) 265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 266 267 if (tiqn) 268 iscsit_put_tiqn_for_login(tiqn); 269 270 return 0; 271 } 272 273 bool iscsit_check_np_match( 274 struct __kernel_sockaddr_storage *sockaddr, 275 struct iscsi_np *np, 276 int network_transport) 277 { 278 struct sockaddr_in *sock_in, *sock_in_e; 279 struct sockaddr_in6 *sock_in6, *sock_in6_e; 280 bool ip_match = false; 281 u16 port; 282 283 if (sockaddr->ss_family == AF_INET6) { 284 sock_in6 = (struct sockaddr_in6 *)sockaddr; 285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 286 287 if (!memcmp(&sock_in6->sin6_addr.in6_u, 288 &sock_in6_e->sin6_addr.in6_u, 289 sizeof(struct in6_addr))) 290 ip_match = true; 291 292 port = ntohs(sock_in6->sin6_port); 293 } else { 294 sock_in = (struct sockaddr_in *)sockaddr; 295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 296 297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 298 ip_match = true; 299 300 port = ntohs(sock_in->sin_port); 301 } 302 303 if ((ip_match == true) && (np->np_port == port) && 304 (np->np_network_transport == network_transport)) 305 return true; 306 307 return false; 308 } 309 310 /* 311 * Called with mutex np_lock held 312 */ 313 static struct iscsi_np *iscsit_get_np( 314 struct __kernel_sockaddr_storage *sockaddr, 315 int network_transport) 316 { 317 struct iscsi_np *np; 318 bool match; 319 320 list_for_each_entry(np, &g_np_list, np_list) { 321 spin_lock_bh(&np->np_thread_lock); 322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 323 spin_unlock_bh(&np->np_thread_lock); 324 continue; 325 } 326 327 match = iscsit_check_np_match(sockaddr, np, network_transport); 328 if (match == true) { 329 /* 330 * Increment the np_exports reference count now to 331 * prevent iscsit_del_np() below from being called 332 * while iscsi_tpg_add_network_portal() is called. 333 */ 334 np->np_exports++; 335 spin_unlock_bh(&np->np_thread_lock); 336 return np; 337 } 338 spin_unlock_bh(&np->np_thread_lock); 339 } 340 341 return NULL; 342 } 343 344 struct iscsi_np *iscsit_add_np( 345 struct __kernel_sockaddr_storage *sockaddr, 346 char *ip_str, 347 int network_transport) 348 { 349 struct sockaddr_in *sock_in; 350 struct sockaddr_in6 *sock_in6; 351 struct iscsi_np *np; 352 int ret; 353 354 mutex_lock(&np_lock); 355 356 /* 357 * Locate the existing struct iscsi_np if already active.. 358 */ 359 np = iscsit_get_np(sockaddr, network_transport); 360 if (np) { 361 mutex_unlock(&np_lock); 362 return np; 363 } 364 365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 366 if (!np) { 367 pr_err("Unable to allocate memory for struct iscsi_np\n"); 368 mutex_unlock(&np_lock); 369 return ERR_PTR(-ENOMEM); 370 } 371 372 np->np_flags |= NPF_IP_NETWORK; 373 if (sockaddr->ss_family == AF_INET6) { 374 sock_in6 = (struct sockaddr_in6 *)sockaddr; 375 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 376 np->np_port = ntohs(sock_in6->sin6_port); 377 } else { 378 sock_in = (struct sockaddr_in *)sockaddr; 379 sprintf(np->np_ip, "%s", ip_str); 380 np->np_port = ntohs(sock_in->sin_port); 381 } 382 383 np->np_network_transport = network_transport; 384 spin_lock_init(&np->np_thread_lock); 385 init_completion(&np->np_restart_comp); 386 INIT_LIST_HEAD(&np->np_list); 387 388 ret = iscsi_target_setup_login_socket(np, sockaddr); 389 if (ret != 0) { 390 kfree(np); 391 mutex_unlock(&np_lock); 392 return ERR_PTR(ret); 393 } 394 395 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 396 if (IS_ERR(np->np_thread)) { 397 pr_err("Unable to create kthread: iscsi_np\n"); 398 ret = PTR_ERR(np->np_thread); 399 kfree(np); 400 mutex_unlock(&np_lock); 401 return ERR_PTR(ret); 402 } 403 /* 404 * Increment the np_exports reference count now to prevent 405 * iscsit_del_np() below from being run while a new call to 406 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 407 * active. We don't need to hold np->np_thread_lock at this 408 * point because iscsi_np has not been added to g_np_list yet. 409 */ 410 np->np_exports = 1; 411 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 412 413 list_add_tail(&np->np_list, &g_np_list); 414 mutex_unlock(&np_lock); 415 416 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 417 np->np_ip, np->np_port, np->np_transport->name); 418 419 return np; 420 } 421 422 int iscsit_reset_np_thread( 423 struct iscsi_np *np, 424 struct iscsi_tpg_np *tpg_np, 425 struct iscsi_portal_group *tpg, 426 bool shutdown) 427 { 428 spin_lock_bh(&np->np_thread_lock); 429 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 430 spin_unlock_bh(&np->np_thread_lock); 431 return 0; 432 } 433 np->np_thread_state = ISCSI_NP_THREAD_RESET; 434 435 if (np->np_thread) { 436 spin_unlock_bh(&np->np_thread_lock); 437 send_sig(SIGINT, np->np_thread, 1); 438 wait_for_completion(&np->np_restart_comp); 439 spin_lock_bh(&np->np_thread_lock); 440 } 441 spin_unlock_bh(&np->np_thread_lock); 442 443 if (tpg_np && shutdown) { 444 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 445 446 wait_for_completion(&tpg_np->tpg_np_comp); 447 } 448 449 return 0; 450 } 451 452 static void iscsit_free_np(struct iscsi_np *np) 453 { 454 if (np->np_socket) 455 sock_release(np->np_socket); 456 } 457 458 int iscsit_del_np(struct iscsi_np *np) 459 { 460 spin_lock_bh(&np->np_thread_lock); 461 np->np_exports--; 462 if (np->np_exports) { 463 spin_unlock_bh(&np->np_thread_lock); 464 return 0; 465 } 466 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 467 spin_unlock_bh(&np->np_thread_lock); 468 469 if (np->np_thread) { 470 /* 471 * We need to send the signal to wakeup Linux/Net 472 * which may be sleeping in sock_accept().. 473 */ 474 send_sig(SIGINT, np->np_thread, 1); 475 kthread_stop(np->np_thread); 476 np->np_thread = NULL; 477 } 478 479 np->np_transport->iscsit_free_np(np); 480 481 mutex_lock(&np_lock); 482 list_del(&np->np_list); 483 mutex_unlock(&np_lock); 484 485 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 486 np->np_ip, np->np_port, np->np_transport->name); 487 488 iscsit_put_transport(np->np_transport); 489 kfree(np); 490 return 0; 491 } 492 493 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 494 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 495 496 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 497 { 498 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 499 return 0; 500 } 501 502 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 503 { 504 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD); 505 506 spin_lock_bh(&conn->cmd_lock); 507 if (!list_empty(&cmd->i_conn_node)) 508 list_del_init(&cmd->i_conn_node); 509 spin_unlock_bh(&conn->cmd_lock); 510 511 __iscsit_free_cmd(cmd, scsi_cmd, true); 512 } 513 514 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 515 { 516 return TARGET_PROT_NORMAL; 517 } 518 519 static struct iscsit_transport iscsi_target_transport = { 520 .name = "iSCSI/TCP", 521 .transport_type = ISCSI_TCP, 522 .owner = NULL, 523 .iscsit_setup_np = iscsit_setup_np, 524 .iscsit_accept_np = iscsit_accept_np, 525 .iscsit_free_np = iscsit_free_np, 526 .iscsit_get_login_rx = iscsit_get_login_rx, 527 .iscsit_put_login_tx = iscsit_put_login_tx, 528 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 529 .iscsit_immediate_queue = iscsit_immediate_queue, 530 .iscsit_response_queue = iscsit_response_queue, 531 .iscsit_queue_data_in = iscsit_queue_rsp, 532 .iscsit_queue_status = iscsit_queue_rsp, 533 .iscsit_aborted_task = iscsit_aborted_task, 534 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 535 }; 536 537 static int __init iscsi_target_init_module(void) 538 { 539 int ret = 0; 540 541 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 542 543 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 544 if (!iscsit_global) { 545 pr_err("Unable to allocate memory for iscsit_global\n"); 546 return -1; 547 } 548 mutex_init(&auth_id_lock); 549 spin_lock_init(&sess_idr_lock); 550 idr_init(&tiqn_idr); 551 idr_init(&sess_idr); 552 553 ret = iscsi_target_register_configfs(); 554 if (ret < 0) 555 goto out; 556 557 ret = iscsi_thread_set_init(); 558 if (ret < 0) 559 goto configfs_out; 560 561 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 562 TARGET_THREAD_SET_COUNT) { 563 pr_err("iscsi_allocate_thread_sets() returned" 564 " unexpected value!\n"); 565 goto ts_out1; 566 } 567 568 lio_qr_cache = kmem_cache_create("lio_qr_cache", 569 sizeof(struct iscsi_queue_req), 570 __alignof__(struct iscsi_queue_req), 0, NULL); 571 if (!lio_qr_cache) { 572 pr_err("nable to kmem_cache_create() for" 573 " lio_qr_cache\n"); 574 goto ts_out2; 575 } 576 577 lio_dr_cache = kmem_cache_create("lio_dr_cache", 578 sizeof(struct iscsi_datain_req), 579 __alignof__(struct iscsi_datain_req), 0, NULL); 580 if (!lio_dr_cache) { 581 pr_err("Unable to kmem_cache_create() for" 582 " lio_dr_cache\n"); 583 goto qr_out; 584 } 585 586 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 587 sizeof(struct iscsi_ooo_cmdsn), 588 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 589 if (!lio_ooo_cache) { 590 pr_err("Unable to kmem_cache_create() for" 591 " lio_ooo_cache\n"); 592 goto dr_out; 593 } 594 595 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 596 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 597 0, NULL); 598 if (!lio_r2t_cache) { 599 pr_err("Unable to kmem_cache_create() for" 600 " lio_r2t_cache\n"); 601 goto ooo_out; 602 } 603 604 iscsit_register_transport(&iscsi_target_transport); 605 606 if (iscsit_load_discovery_tpg() < 0) 607 goto r2t_out; 608 609 return ret; 610 r2t_out: 611 kmem_cache_destroy(lio_r2t_cache); 612 ooo_out: 613 kmem_cache_destroy(lio_ooo_cache); 614 dr_out: 615 kmem_cache_destroy(lio_dr_cache); 616 qr_out: 617 kmem_cache_destroy(lio_qr_cache); 618 ts_out2: 619 iscsi_deallocate_thread_sets(); 620 ts_out1: 621 iscsi_thread_set_free(); 622 configfs_out: 623 iscsi_target_deregister_configfs(); 624 out: 625 kfree(iscsit_global); 626 return -ENOMEM; 627 } 628 629 static void __exit iscsi_target_cleanup_module(void) 630 { 631 iscsi_deallocate_thread_sets(); 632 iscsi_thread_set_free(); 633 iscsit_release_discovery_tpg(); 634 iscsit_unregister_transport(&iscsi_target_transport); 635 kmem_cache_destroy(lio_qr_cache); 636 kmem_cache_destroy(lio_dr_cache); 637 kmem_cache_destroy(lio_ooo_cache); 638 kmem_cache_destroy(lio_r2t_cache); 639 640 iscsi_target_deregister_configfs(); 641 642 kfree(iscsit_global); 643 } 644 645 static int iscsit_add_reject( 646 struct iscsi_conn *conn, 647 u8 reason, 648 unsigned char *buf) 649 { 650 struct iscsi_cmd *cmd; 651 652 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 653 if (!cmd) 654 return -1; 655 656 cmd->iscsi_opcode = ISCSI_OP_REJECT; 657 cmd->reject_reason = reason; 658 659 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 660 if (!cmd->buf_ptr) { 661 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 662 iscsit_free_cmd(cmd, false); 663 return -1; 664 } 665 666 spin_lock_bh(&conn->cmd_lock); 667 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 668 spin_unlock_bh(&conn->cmd_lock); 669 670 cmd->i_state = ISTATE_SEND_REJECT; 671 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 672 673 return -1; 674 } 675 676 static int iscsit_add_reject_from_cmd( 677 struct iscsi_cmd *cmd, 678 u8 reason, 679 bool add_to_conn, 680 unsigned char *buf) 681 { 682 struct iscsi_conn *conn; 683 684 if (!cmd->conn) { 685 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 686 cmd->init_task_tag); 687 return -1; 688 } 689 conn = cmd->conn; 690 691 cmd->iscsi_opcode = ISCSI_OP_REJECT; 692 cmd->reject_reason = reason; 693 694 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 695 if (!cmd->buf_ptr) { 696 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 697 iscsit_free_cmd(cmd, false); 698 return -1; 699 } 700 701 if (add_to_conn) { 702 spin_lock_bh(&conn->cmd_lock); 703 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 704 spin_unlock_bh(&conn->cmd_lock); 705 } 706 707 cmd->i_state = ISTATE_SEND_REJECT; 708 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 709 /* 710 * Perform the kref_put now if se_cmd has already been setup by 711 * scsit_setup_scsi_cmd() 712 */ 713 if (cmd->se_cmd.se_tfo != NULL) { 714 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 715 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 716 } 717 return -1; 718 } 719 720 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 721 unsigned char *buf) 722 { 723 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 724 } 725 726 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 727 { 728 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 729 } 730 731 /* 732 * Map some portion of the allocated scatterlist to an iovec, suitable for 733 * kernel sockets to copy data in/out. 734 */ 735 static int iscsit_map_iovec( 736 struct iscsi_cmd *cmd, 737 struct kvec *iov, 738 u32 data_offset, 739 u32 data_length) 740 { 741 u32 i = 0; 742 struct scatterlist *sg; 743 unsigned int page_off; 744 745 /* 746 * We know each entry in t_data_sg contains a page. 747 */ 748 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 749 page_off = (data_offset % PAGE_SIZE); 750 751 cmd->first_data_sg = sg; 752 cmd->first_data_sg_off = page_off; 753 754 while (data_length) { 755 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 756 757 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 758 iov[i].iov_len = cur_len; 759 760 data_length -= cur_len; 761 page_off = 0; 762 sg = sg_next(sg); 763 i++; 764 } 765 766 cmd->kmapped_nents = i; 767 768 return i; 769 } 770 771 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 772 { 773 u32 i; 774 struct scatterlist *sg; 775 776 sg = cmd->first_data_sg; 777 778 for (i = 0; i < cmd->kmapped_nents; i++) 779 kunmap(sg_page(&sg[i])); 780 } 781 782 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 783 { 784 LIST_HEAD(ack_list); 785 struct iscsi_cmd *cmd, *cmd_p; 786 787 conn->exp_statsn = exp_statsn; 788 789 if (conn->sess->sess_ops->RDMAExtensions) 790 return; 791 792 spin_lock_bh(&conn->cmd_lock); 793 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 794 spin_lock(&cmd->istate_lock); 795 if ((cmd->i_state == ISTATE_SENT_STATUS) && 796 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 797 cmd->i_state = ISTATE_REMOVE; 798 spin_unlock(&cmd->istate_lock); 799 list_move_tail(&cmd->i_conn_node, &ack_list); 800 continue; 801 } 802 spin_unlock(&cmd->istate_lock); 803 } 804 spin_unlock_bh(&conn->cmd_lock); 805 806 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 807 list_del_init(&cmd->i_conn_node); 808 iscsit_free_cmd(cmd, false); 809 } 810 } 811 812 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 813 { 814 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 815 816 iov_count += ISCSI_IOV_DATA_BUFFER; 817 818 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 819 if (!cmd->iov_data) { 820 pr_err("Unable to allocate cmd->iov_data\n"); 821 return -ENOMEM; 822 } 823 824 cmd->orig_iov_data_count = iov_count; 825 return 0; 826 } 827 828 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 829 unsigned char *buf) 830 { 831 int data_direction, payload_length; 832 struct iscsi_scsi_req *hdr; 833 int iscsi_task_attr; 834 int sam_task_attr; 835 836 atomic_long_inc(&conn->sess->cmd_pdus); 837 838 hdr = (struct iscsi_scsi_req *) buf; 839 payload_length = ntoh24(hdr->dlength); 840 841 /* FIXME; Add checks for AdditionalHeaderSegment */ 842 843 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 844 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 845 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 846 " not set. Bad iSCSI Initiator.\n"); 847 return iscsit_add_reject_cmd(cmd, 848 ISCSI_REASON_BOOKMARK_INVALID, buf); 849 } 850 851 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 852 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 853 /* 854 * From RFC-3720 Section 10.3.1: 855 * 856 * "Either or both of R and W MAY be 1 when either the 857 * Expected Data Transfer Length and/or Bidirectional Read 858 * Expected Data Transfer Length are 0" 859 * 860 * For this case, go ahead and clear the unnecssary bits 861 * to avoid any confusion with ->data_direction. 862 */ 863 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 864 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 865 866 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 867 " set when Expected Data Transfer Length is 0 for" 868 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 869 } 870 871 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 872 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 873 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 874 " MUST be set if Expected Data Transfer Length is not 0." 875 " Bad iSCSI Initiator\n"); 876 return iscsit_add_reject_cmd(cmd, 877 ISCSI_REASON_BOOKMARK_INVALID, buf); 878 } 879 880 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 881 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 882 pr_err("Bidirectional operations not supported!\n"); 883 return iscsit_add_reject_cmd(cmd, 884 ISCSI_REASON_BOOKMARK_INVALID, buf); 885 } 886 887 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 888 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 889 " Scsi Command PDU.\n"); 890 return iscsit_add_reject_cmd(cmd, 891 ISCSI_REASON_BOOKMARK_INVALID, buf); 892 } 893 894 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 895 pr_err("ImmediateData=No but DataSegmentLength=%u," 896 " protocol error.\n", payload_length); 897 return iscsit_add_reject_cmd(cmd, 898 ISCSI_REASON_PROTOCOL_ERROR, buf); 899 } 900 901 if ((be32_to_cpu(hdr->data_length) == payload_length) && 902 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 903 pr_err("Expected Data Transfer Length and Length of" 904 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 905 " bit is not set protocol error\n"); 906 return iscsit_add_reject_cmd(cmd, 907 ISCSI_REASON_PROTOCOL_ERROR, buf); 908 } 909 910 if (payload_length > be32_to_cpu(hdr->data_length)) { 911 pr_err("DataSegmentLength: %u is greater than" 912 " EDTL: %u, protocol error.\n", payload_length, 913 hdr->data_length); 914 return iscsit_add_reject_cmd(cmd, 915 ISCSI_REASON_PROTOCOL_ERROR, buf); 916 } 917 918 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 919 pr_err("DataSegmentLength: %u is greater than" 920 " MaxXmitDataSegmentLength: %u, protocol error.\n", 921 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 922 return iscsit_add_reject_cmd(cmd, 923 ISCSI_REASON_PROTOCOL_ERROR, buf); 924 } 925 926 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 927 pr_err("DataSegmentLength: %u is greater than" 928 " FirstBurstLength: %u, protocol error.\n", 929 payload_length, conn->sess->sess_ops->FirstBurstLength); 930 return iscsit_add_reject_cmd(cmd, 931 ISCSI_REASON_BOOKMARK_INVALID, buf); 932 } 933 934 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 935 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 936 DMA_NONE; 937 938 cmd->data_direction = data_direction; 939 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 940 /* 941 * Figure out the SAM Task Attribute for the incoming SCSI CDB 942 */ 943 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 944 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 945 sam_task_attr = MSG_SIMPLE_TAG; 946 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 947 sam_task_attr = MSG_ORDERED_TAG; 948 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 949 sam_task_attr = MSG_HEAD_TAG; 950 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 951 sam_task_attr = MSG_ACA_TAG; 952 else { 953 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 954 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 955 sam_task_attr = MSG_SIMPLE_TAG; 956 } 957 958 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 959 cmd->i_state = ISTATE_NEW_CMD; 960 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 961 cmd->immediate_data = (payload_length) ? 1 : 0; 962 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 963 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 964 if (cmd->unsolicited_data) 965 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 966 967 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 968 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 969 spin_lock_bh(&conn->sess->ttt_lock); 970 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 971 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 973 spin_unlock_bh(&conn->sess->ttt_lock); 974 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 975 cmd->targ_xfer_tag = 0xFFFFFFFF; 976 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 977 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 978 cmd->first_burst_len = payload_length; 979 980 if (!conn->sess->sess_ops->RDMAExtensions && 981 cmd->data_direction == DMA_FROM_DEVICE) { 982 struct iscsi_datain_req *dr; 983 984 dr = iscsit_allocate_datain_req(); 985 if (!dr) 986 return iscsit_add_reject_cmd(cmd, 987 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 988 989 iscsit_attach_datain_req(cmd, dr); 990 } 991 992 /* 993 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 994 */ 995 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 996 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 997 cmd->data_direction, sam_task_attr, 998 cmd->sense_buffer + 2); 999 1000 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1001 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1002 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1003 conn->cid); 1004 1005 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1006 1007 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1008 scsilun_to_int(&hdr->lun)); 1009 if (cmd->sense_reason) 1010 goto attach_cmd; 1011 1012 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1013 if (cmd->sense_reason) { 1014 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1015 return iscsit_add_reject_cmd(cmd, 1016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1017 } 1018 1019 goto attach_cmd; 1020 } 1021 1022 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1023 return iscsit_add_reject_cmd(cmd, 1024 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1025 } 1026 1027 attach_cmd: 1028 spin_lock_bh(&conn->cmd_lock); 1029 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1030 spin_unlock_bh(&conn->cmd_lock); 1031 /* 1032 * Check if we need to delay processing because of ALUA 1033 * Active/NonOptimized primary access state.. 1034 */ 1035 core_alua_check_nonop_delay(&cmd->se_cmd); 1036 1037 return 0; 1038 } 1039 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1040 1041 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1042 { 1043 iscsit_set_dataout_sequence_values(cmd); 1044 1045 spin_lock_bh(&cmd->dataout_timeout_lock); 1046 iscsit_start_dataout_timer(cmd, cmd->conn); 1047 spin_unlock_bh(&cmd->dataout_timeout_lock); 1048 } 1049 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1050 1051 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1052 struct iscsi_scsi_req *hdr) 1053 { 1054 int cmdsn_ret = 0; 1055 /* 1056 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1057 * the Immediate Bit is not set, and no Immediate 1058 * Data is attached. 1059 * 1060 * A PDU/CmdSN carrying Immediate Data can only 1061 * be processed after the DataCRC has passed. 1062 * If the DataCRC fails, the CmdSN MUST NOT 1063 * be acknowledged. (See below) 1064 */ 1065 if (!cmd->immediate_data) { 1066 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1067 (unsigned char *)hdr, hdr->cmdsn); 1068 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1069 return -1; 1070 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1071 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1072 return 0; 1073 } 1074 } 1075 1076 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1077 1078 /* 1079 * If no Immediate Data is attached, it's OK to return now. 1080 */ 1081 if (!cmd->immediate_data) { 1082 if (!cmd->sense_reason && cmd->unsolicited_data) 1083 iscsit_set_unsoliticed_dataout(cmd); 1084 if (!cmd->sense_reason) 1085 return 0; 1086 1087 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1088 return 0; 1089 } 1090 1091 /* 1092 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1093 * execution. These exceptions are processed in CmdSN order using 1094 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1095 */ 1096 if (cmd->sense_reason) { 1097 if (cmd->reject_reason) 1098 return 0; 1099 1100 return 1; 1101 } 1102 /* 1103 * Call directly into transport_generic_new_cmd() to perform 1104 * the backend memory allocation. 1105 */ 1106 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1107 if (cmd->sense_reason) 1108 return 1; 1109 1110 return 0; 1111 } 1112 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1113 1114 static int 1115 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1116 bool dump_payload) 1117 { 1118 struct iscsi_conn *conn = cmd->conn; 1119 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1120 /* 1121 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1122 */ 1123 if (dump_payload == true) 1124 goto after_immediate_data; 1125 1126 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1127 cmd->first_burst_len); 1128 after_immediate_data: 1129 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1130 /* 1131 * A PDU/CmdSN carrying Immediate Data passed 1132 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1133 * Immediate Bit is not set. 1134 */ 1135 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1136 (unsigned char *)hdr, hdr->cmdsn); 1137 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1138 return -1; 1139 1140 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1141 int rc; 1142 1143 rc = iscsit_dump_data_payload(cmd->conn, 1144 cmd->first_burst_len, 1); 1145 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1146 return rc; 1147 } else if (cmd->unsolicited_data) 1148 iscsit_set_unsoliticed_dataout(cmd); 1149 1150 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1151 /* 1152 * Immediate Data failed DataCRC and ERL>=1, 1153 * silently drop this PDU and let the initiator 1154 * plug the CmdSN gap. 1155 * 1156 * FIXME: Send Unsolicited NOPIN with reserved 1157 * TTT here to help the initiator figure out 1158 * the missing CmdSN, although they should be 1159 * intelligent enough to determine the missing 1160 * CmdSN and issue a retry to plug the sequence. 1161 */ 1162 cmd->i_state = ISTATE_REMOVE; 1163 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1164 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1165 return -1; 1166 1167 return 0; 1168 } 1169 1170 static int 1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1172 unsigned char *buf) 1173 { 1174 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1175 int rc, immed_data; 1176 bool dump_payload = false; 1177 1178 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1179 if (rc < 0) 1180 return 0; 1181 /* 1182 * Allocation iovecs needed for struct socket operations for 1183 * traditional iSCSI block I/O. 1184 */ 1185 if (iscsit_allocate_iovecs(cmd) < 0) { 1186 return iscsit_add_reject_cmd(cmd, 1187 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1188 } 1189 immed_data = cmd->immediate_data; 1190 1191 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1192 if (rc < 0) 1193 return rc; 1194 else if (rc > 0) 1195 dump_payload = true; 1196 1197 if (!immed_data) 1198 return 0; 1199 1200 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1201 } 1202 1203 static u32 iscsit_do_crypto_hash_sg( 1204 struct hash_desc *hash, 1205 struct iscsi_cmd *cmd, 1206 u32 data_offset, 1207 u32 data_length, 1208 u32 padding, 1209 u8 *pad_bytes) 1210 { 1211 u32 data_crc; 1212 u32 i; 1213 struct scatterlist *sg; 1214 unsigned int page_off; 1215 1216 crypto_hash_init(hash); 1217 1218 sg = cmd->first_data_sg; 1219 page_off = cmd->first_data_sg_off; 1220 1221 i = 0; 1222 while (data_length) { 1223 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1224 1225 crypto_hash_update(hash, &sg[i], cur_len); 1226 1227 data_length -= cur_len; 1228 page_off = 0; 1229 i++; 1230 } 1231 1232 if (padding) { 1233 struct scatterlist pad_sg; 1234 1235 sg_init_one(&pad_sg, pad_bytes, padding); 1236 crypto_hash_update(hash, &pad_sg, padding); 1237 } 1238 crypto_hash_final(hash, (u8 *) &data_crc); 1239 1240 return data_crc; 1241 } 1242 1243 static void iscsit_do_crypto_hash_buf( 1244 struct hash_desc *hash, 1245 const void *buf, 1246 u32 payload_length, 1247 u32 padding, 1248 u8 *pad_bytes, 1249 u8 *data_crc) 1250 { 1251 struct scatterlist sg; 1252 1253 crypto_hash_init(hash); 1254 1255 sg_init_one(&sg, buf, payload_length); 1256 crypto_hash_update(hash, &sg, payload_length); 1257 1258 if (padding) { 1259 sg_init_one(&sg, pad_bytes, padding); 1260 crypto_hash_update(hash, &sg, padding); 1261 } 1262 crypto_hash_final(hash, data_crc); 1263 } 1264 1265 int 1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1267 struct iscsi_cmd **out_cmd) 1268 { 1269 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1270 struct iscsi_cmd *cmd = NULL; 1271 struct se_cmd *se_cmd; 1272 u32 payload_length = ntoh24(hdr->dlength); 1273 int rc; 1274 1275 if (!payload_length) { 1276 pr_warn("DataOUT payload is ZERO, ignoring.\n"); 1277 return 0; 1278 } 1279 1280 /* iSCSI write */ 1281 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1282 1283 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1284 pr_err("DataSegmentLength: %u is greater than" 1285 " MaxXmitDataSegmentLength: %u\n", payload_length, 1286 conn->conn_ops->MaxXmitDataSegmentLength); 1287 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1288 buf); 1289 } 1290 1291 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1292 payload_length); 1293 if (!cmd) 1294 return 0; 1295 1296 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1297 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1298 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1299 payload_length, conn->cid); 1300 1301 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1302 pr_err("Command ITT: 0x%08x received DataOUT after" 1303 " last DataOUT received, dumping payload\n", 1304 cmd->init_task_tag); 1305 return iscsit_dump_data_payload(conn, payload_length, 1); 1306 } 1307 1308 if (cmd->data_direction != DMA_TO_DEVICE) { 1309 pr_err("Command ITT: 0x%08x received DataOUT for a" 1310 " NON-WRITE command.\n", cmd->init_task_tag); 1311 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 1312 } 1313 se_cmd = &cmd->se_cmd; 1314 iscsit_mod_dataout_timer(cmd); 1315 1316 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1317 pr_err("DataOut Offset: %u, Length %u greater than" 1318 " iSCSI Command EDTL %u, protocol error.\n", 1319 hdr->offset, payload_length, cmd->se_cmd.data_length); 1320 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1321 } 1322 1323 if (cmd->unsolicited_data) { 1324 int dump_unsolicited_data = 0; 1325 1326 if (conn->sess->sess_ops->InitialR2T) { 1327 pr_err("Received unexpected unsolicited data" 1328 " while InitialR2T=Yes, protocol error.\n"); 1329 transport_send_check_condition_and_sense(&cmd->se_cmd, 1330 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1331 return -1; 1332 } 1333 /* 1334 * Special case for dealing with Unsolicited DataOUT 1335 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1336 * failures; 1337 */ 1338 1339 /* Something's amiss if we're not in WRITE_PENDING state... */ 1340 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1341 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1342 dump_unsolicited_data = 1; 1343 1344 if (dump_unsolicited_data) { 1345 /* 1346 * Check if a delayed TASK_ABORTED status needs to 1347 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1348 * received with the unsolicitied data out. 1349 */ 1350 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1351 iscsit_stop_dataout_timer(cmd); 1352 1353 transport_check_aborted_status(se_cmd, 1354 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1355 return iscsit_dump_data_payload(conn, payload_length, 1); 1356 } 1357 } else { 1358 /* 1359 * For the normal solicited data path: 1360 * 1361 * Check for a delayed TASK_ABORTED status and dump any 1362 * incoming data out payload if one exists. Also, when the 1363 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1364 * data out sequence, we decrement outstanding_r2ts. Once 1365 * outstanding_r2ts reaches zero, go ahead and send the delayed 1366 * TASK_ABORTED status. 1367 */ 1368 if (se_cmd->transport_state & CMD_T_ABORTED) { 1369 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1370 if (--cmd->outstanding_r2ts < 1) { 1371 iscsit_stop_dataout_timer(cmd); 1372 transport_check_aborted_status( 1373 se_cmd, 1); 1374 } 1375 1376 return iscsit_dump_data_payload(conn, payload_length, 1); 1377 } 1378 } 1379 /* 1380 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1381 * within-command recovery checks before receiving the payload. 1382 */ 1383 rc = iscsit_check_pre_dataout(cmd, buf); 1384 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1385 return 0; 1386 else if (rc == DATAOUT_CANNOT_RECOVER) 1387 return -1; 1388 1389 *out_cmd = cmd; 1390 return 0; 1391 } 1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1393 1394 static int 1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1396 struct iscsi_data *hdr) 1397 { 1398 struct kvec *iov; 1399 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1400 u32 payload_length = ntoh24(hdr->dlength); 1401 int iov_ret, data_crc_failed = 0; 1402 1403 rx_size += payload_length; 1404 iov = &cmd->iov_data[0]; 1405 1406 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1407 payload_length); 1408 if (iov_ret < 0) 1409 return -1; 1410 1411 iov_count += iov_ret; 1412 1413 padding = ((-payload_length) & 3); 1414 if (padding != 0) { 1415 iov[iov_count].iov_base = cmd->pad_bytes; 1416 iov[iov_count++].iov_len = padding; 1417 rx_size += padding; 1418 pr_debug("Receiving %u padding bytes.\n", padding); 1419 } 1420 1421 if (conn->conn_ops->DataDigest) { 1422 iov[iov_count].iov_base = &checksum; 1423 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1424 rx_size += ISCSI_CRC_LEN; 1425 } 1426 1427 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1428 1429 iscsit_unmap_iovec(cmd); 1430 1431 if (rx_got != rx_size) 1432 return -1; 1433 1434 if (conn->conn_ops->DataDigest) { 1435 u32 data_crc; 1436 1437 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1438 be32_to_cpu(hdr->offset), 1439 payload_length, padding, 1440 cmd->pad_bytes); 1441 1442 if (checksum != data_crc) { 1443 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1444 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1445 " does not match computed 0x%08x\n", 1446 hdr->itt, hdr->offset, payload_length, 1447 hdr->datasn, checksum, data_crc); 1448 data_crc_failed = 1; 1449 } else { 1450 pr_debug("Got CRC32C DataDigest 0x%08x for" 1451 " %u bytes of Data Out\n", checksum, 1452 payload_length); 1453 } 1454 } 1455 1456 return data_crc_failed; 1457 } 1458 1459 int 1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1461 bool data_crc_failed) 1462 { 1463 struct iscsi_conn *conn = cmd->conn; 1464 int rc, ooo_cmdsn; 1465 /* 1466 * Increment post receive data and CRC values or perform 1467 * within-command recovery. 1468 */ 1469 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1470 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1471 return 0; 1472 else if (rc == DATAOUT_SEND_R2T) { 1473 iscsit_set_dataout_sequence_values(cmd); 1474 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1475 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1476 /* 1477 * Handle extra special case for out of order 1478 * Unsolicited Data Out. 1479 */ 1480 spin_lock_bh(&cmd->istate_lock); 1481 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1482 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1483 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1484 spin_unlock_bh(&cmd->istate_lock); 1485 1486 iscsit_stop_dataout_timer(cmd); 1487 if (ooo_cmdsn) 1488 return 0; 1489 target_execute_cmd(&cmd->se_cmd); 1490 return 0; 1491 } else /* DATAOUT_CANNOT_RECOVER */ 1492 return -1; 1493 1494 return 0; 1495 } 1496 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1497 1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1499 { 1500 struct iscsi_cmd *cmd = NULL; 1501 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1502 int rc; 1503 bool data_crc_failed = false; 1504 1505 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1506 if (rc < 0) 1507 return 0; 1508 else if (!cmd) 1509 return 0; 1510 1511 rc = iscsit_get_dataout(conn, cmd, hdr); 1512 if (rc < 0) 1513 return rc; 1514 else if (rc > 0) 1515 data_crc_failed = true; 1516 1517 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1518 } 1519 1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1521 struct iscsi_nopout *hdr) 1522 { 1523 u32 payload_length = ntoh24(hdr->dlength); 1524 1525 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1526 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1527 if (!cmd) 1528 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1529 (unsigned char *)hdr); 1530 1531 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1532 (unsigned char *)hdr); 1533 } 1534 1535 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1536 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1537 " not set, protocol error.\n"); 1538 if (!cmd) 1539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1540 (unsigned char *)hdr); 1541 1542 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1543 (unsigned char *)hdr); 1544 } 1545 1546 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1547 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1548 " greater than MaxXmitDataSegmentLength: %u, protocol" 1549 " error.\n", payload_length, 1550 conn->conn_ops->MaxXmitDataSegmentLength); 1551 if (!cmd) 1552 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1553 (unsigned char *)hdr); 1554 1555 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1556 (unsigned char *)hdr); 1557 } 1558 1559 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1560 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1561 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1562 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1563 payload_length); 1564 /* 1565 * This is not a response to a Unsolicited NopIN, which means 1566 * it can either be a NOPOUT ping request (with a valid ITT), 1567 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1568 * Either way, make sure we allocate an struct iscsi_cmd, as both 1569 * can contain ping data. 1570 */ 1571 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1572 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1573 cmd->i_state = ISTATE_SEND_NOPIN; 1574 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1575 1 : 0); 1576 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1577 cmd->targ_xfer_tag = 0xFFFFFFFF; 1578 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1579 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1580 cmd->data_direction = DMA_NONE; 1581 } 1582 1583 return 0; 1584 } 1585 EXPORT_SYMBOL(iscsit_setup_nop_out); 1586 1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1588 struct iscsi_nopout *hdr) 1589 { 1590 struct iscsi_cmd *cmd_p = NULL; 1591 int cmdsn_ret = 0; 1592 /* 1593 * Initiator is expecting a NopIN ping reply.. 1594 */ 1595 if (hdr->itt != RESERVED_ITT) { 1596 if (!cmd) 1597 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1598 (unsigned char *)hdr); 1599 1600 spin_lock_bh(&conn->cmd_lock); 1601 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1602 spin_unlock_bh(&conn->cmd_lock); 1603 1604 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1605 1606 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1607 iscsit_add_cmd_to_response_queue(cmd, conn, 1608 cmd->i_state); 1609 return 0; 1610 } 1611 1612 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1613 (unsigned char *)hdr, hdr->cmdsn); 1614 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1615 return 0; 1616 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1617 return -1; 1618 1619 return 0; 1620 } 1621 /* 1622 * This was a response to a unsolicited NOPIN ping. 1623 */ 1624 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1625 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1626 if (!cmd_p) 1627 return -EINVAL; 1628 1629 iscsit_stop_nopin_response_timer(conn); 1630 1631 cmd_p->i_state = ISTATE_REMOVE; 1632 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1633 1634 iscsit_start_nopin_timer(conn); 1635 return 0; 1636 } 1637 /* 1638 * Otherwise, initiator is not expecting a NOPIN is response. 1639 * Just ignore for now. 1640 */ 1641 return 0; 1642 } 1643 EXPORT_SYMBOL(iscsit_process_nop_out); 1644 1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1646 unsigned char *buf) 1647 { 1648 unsigned char *ping_data = NULL; 1649 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1650 struct kvec *iov = NULL; 1651 u32 payload_length = ntoh24(hdr->dlength); 1652 int ret; 1653 1654 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1655 if (ret < 0) 1656 return 0; 1657 /* 1658 * Handle NOP-OUT payload for traditional iSCSI sockets 1659 */ 1660 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1661 u32 checksum, data_crc, padding = 0; 1662 int niov = 0, rx_got, rx_size = payload_length; 1663 1664 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1665 if (!ping_data) { 1666 pr_err("Unable to allocate memory for" 1667 " NOPOUT ping data.\n"); 1668 ret = -1; 1669 goto out; 1670 } 1671 1672 iov = &cmd->iov_misc[0]; 1673 iov[niov].iov_base = ping_data; 1674 iov[niov++].iov_len = payload_length; 1675 1676 padding = ((-payload_length) & 3); 1677 if (padding != 0) { 1678 pr_debug("Receiving %u additional bytes" 1679 " for padding.\n", padding); 1680 iov[niov].iov_base = &cmd->pad_bytes; 1681 iov[niov++].iov_len = padding; 1682 rx_size += padding; 1683 } 1684 if (conn->conn_ops->DataDigest) { 1685 iov[niov].iov_base = &checksum; 1686 iov[niov++].iov_len = ISCSI_CRC_LEN; 1687 rx_size += ISCSI_CRC_LEN; 1688 } 1689 1690 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1691 if (rx_got != rx_size) { 1692 ret = -1; 1693 goto out; 1694 } 1695 1696 if (conn->conn_ops->DataDigest) { 1697 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1698 ping_data, payload_length, 1699 padding, cmd->pad_bytes, 1700 (u8 *)&data_crc); 1701 1702 if (checksum != data_crc) { 1703 pr_err("Ping data CRC32C DataDigest" 1704 " 0x%08x does not match computed 0x%08x\n", 1705 checksum, data_crc); 1706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1707 pr_err("Unable to recover from" 1708 " NOPOUT Ping DataCRC failure while in" 1709 " ERL=0.\n"); 1710 ret = -1; 1711 goto out; 1712 } else { 1713 /* 1714 * Silently drop this PDU and let the 1715 * initiator plug the CmdSN gap. 1716 */ 1717 pr_debug("Dropping NOPOUT" 1718 " Command CmdSN: 0x%08x due to" 1719 " DataCRC error.\n", hdr->cmdsn); 1720 ret = 0; 1721 goto out; 1722 } 1723 } else { 1724 pr_debug("Got CRC32C DataDigest" 1725 " 0x%08x for %u bytes of ping data.\n", 1726 checksum, payload_length); 1727 } 1728 } 1729 1730 ping_data[payload_length] = '\0'; 1731 /* 1732 * Attach ping data to struct iscsi_cmd->buf_ptr. 1733 */ 1734 cmd->buf_ptr = ping_data; 1735 cmd->buf_ptr_size = payload_length; 1736 1737 pr_debug("Got %u bytes of NOPOUT ping" 1738 " data.\n", payload_length); 1739 pr_debug("Ping Data: \"%s\"\n", ping_data); 1740 } 1741 1742 return iscsit_process_nop_out(conn, cmd, hdr); 1743 out: 1744 if (cmd) 1745 iscsit_free_cmd(cmd, false); 1746 1747 kfree(ping_data); 1748 return ret; 1749 } 1750 1751 int 1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1753 unsigned char *buf) 1754 { 1755 struct se_tmr_req *se_tmr; 1756 struct iscsi_tmr_req *tmr_req; 1757 struct iscsi_tm *hdr; 1758 int out_of_order_cmdsn = 0, ret; 1759 bool sess_ref = false; 1760 u8 function; 1761 1762 hdr = (struct iscsi_tm *) buf; 1763 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1764 function = hdr->flags; 1765 1766 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1767 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1768 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1769 hdr->rtt, hdr->refcmdsn, conn->cid); 1770 1771 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1772 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1773 hdr->rtt != RESERVED_ITT)) { 1774 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1775 hdr->rtt = RESERVED_ITT; 1776 } 1777 1778 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1779 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1780 pr_err("Task Management Request TASK_REASSIGN not" 1781 " issued as immediate command, bad iSCSI Initiator" 1782 "implementation\n"); 1783 return iscsit_add_reject_cmd(cmd, 1784 ISCSI_REASON_PROTOCOL_ERROR, buf); 1785 } 1786 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1787 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1788 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1789 1790 cmd->data_direction = DMA_NONE; 1791 1792 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1793 if (!cmd->tmr_req) { 1794 pr_err("Unable to allocate memory for" 1795 " Task Management command!\n"); 1796 return iscsit_add_reject_cmd(cmd, 1797 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1798 buf); 1799 } 1800 1801 /* 1802 * TASK_REASSIGN for ERL=2 / connection stays inside of 1803 * LIO-Target $FABRIC_MOD 1804 */ 1805 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1806 1807 u8 tcm_function; 1808 int ret; 1809 1810 transport_init_se_cmd(&cmd->se_cmd, 1811 &lio_target_fabric_configfs->tf_ops, 1812 conn->sess->se_sess, 0, DMA_NONE, 1813 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1814 1815 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1816 sess_ref = true; 1817 1818 switch (function) { 1819 case ISCSI_TM_FUNC_ABORT_TASK: 1820 tcm_function = TMR_ABORT_TASK; 1821 break; 1822 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1823 tcm_function = TMR_ABORT_TASK_SET; 1824 break; 1825 case ISCSI_TM_FUNC_CLEAR_ACA: 1826 tcm_function = TMR_CLEAR_ACA; 1827 break; 1828 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1829 tcm_function = TMR_CLEAR_TASK_SET; 1830 break; 1831 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1832 tcm_function = TMR_LUN_RESET; 1833 break; 1834 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1835 tcm_function = TMR_TARGET_WARM_RESET; 1836 break; 1837 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1838 tcm_function = TMR_TARGET_COLD_RESET; 1839 break; 1840 default: 1841 pr_err("Unknown iSCSI TMR Function:" 1842 " 0x%02x\n", function); 1843 return iscsit_add_reject_cmd(cmd, 1844 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1845 } 1846 1847 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1848 tcm_function, GFP_KERNEL); 1849 if (ret < 0) 1850 return iscsit_add_reject_cmd(cmd, 1851 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1852 1853 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1854 } 1855 1856 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1857 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1858 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1859 cmd->init_task_tag = hdr->itt; 1860 cmd->targ_xfer_tag = 0xFFFFFFFF; 1861 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1862 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1863 se_tmr = cmd->se_cmd.se_tmr_req; 1864 tmr_req = cmd->tmr_req; 1865 /* 1866 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1867 */ 1868 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1869 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1870 scsilun_to_int(&hdr->lun)); 1871 if (ret < 0) { 1872 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1873 goto attach; 1874 } 1875 } 1876 1877 switch (function) { 1878 case ISCSI_TM_FUNC_ABORT_TASK: 1879 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1880 if (se_tmr->response) 1881 goto attach; 1882 break; 1883 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1884 case ISCSI_TM_FUNC_CLEAR_ACA: 1885 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1886 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1887 break; 1888 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1889 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1890 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1891 goto attach; 1892 } 1893 break; 1894 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1895 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1896 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1897 goto attach; 1898 } 1899 break; 1900 case ISCSI_TM_FUNC_TASK_REASSIGN: 1901 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1902 /* 1903 * Perform sanity checks on the ExpDataSN only if the 1904 * TASK_REASSIGN was successful. 1905 */ 1906 if (se_tmr->response) 1907 break; 1908 1909 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1910 return iscsit_add_reject_cmd(cmd, 1911 ISCSI_REASON_BOOKMARK_INVALID, buf); 1912 break; 1913 default: 1914 pr_err("Unknown TMR function: 0x%02x, protocol" 1915 " error.\n", function); 1916 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1917 goto attach; 1918 } 1919 1920 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1921 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1922 se_tmr->call_transport = 1; 1923 attach: 1924 spin_lock_bh(&conn->cmd_lock); 1925 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1926 spin_unlock_bh(&conn->cmd_lock); 1927 1928 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1929 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1930 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1931 out_of_order_cmdsn = 1; 1932 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1933 return 0; 1934 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1935 return -1; 1936 } 1937 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1938 1939 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1940 return 0; 1941 /* 1942 * Found the referenced task, send to transport for processing. 1943 */ 1944 if (se_tmr->call_transport) 1945 return transport_generic_handle_tmr(&cmd->se_cmd); 1946 1947 /* 1948 * Could not find the referenced LUN, task, or Task Management 1949 * command not authorized or supported. Change state and 1950 * let the tx_thread send the response. 1951 * 1952 * For connection recovery, this is also the default action for 1953 * TMR TASK_REASSIGN. 1954 */ 1955 if (sess_ref) { 1956 pr_debug("Handle TMR, using sess_ref=true check\n"); 1957 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1958 } 1959 1960 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1961 return 0; 1962 } 1963 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1964 1965 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1966 int 1967 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1968 struct iscsi_text *hdr) 1969 { 1970 u32 payload_length = ntoh24(hdr->dlength); 1971 1972 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1973 pr_err("Unable to accept text parameter length: %u" 1974 "greater than MaxXmitDataSegmentLength %u.\n", 1975 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1976 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1977 (unsigned char *)hdr); 1978 } 1979 1980 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 1981 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 1982 pr_err("Multi sequence text commands currently not supported\n"); 1983 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 1984 (unsigned char *)hdr); 1985 } 1986 1987 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1988 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1989 hdr->exp_statsn, payload_length); 1990 1991 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1992 cmd->i_state = ISTATE_SEND_TEXTRSP; 1993 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1994 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1995 cmd->targ_xfer_tag = 0xFFFFFFFF; 1996 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1997 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1998 cmd->data_direction = DMA_NONE; 1999 2000 return 0; 2001 } 2002 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2003 2004 int 2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2006 struct iscsi_text *hdr) 2007 { 2008 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2009 int cmdsn_ret; 2010 2011 if (!text_in) { 2012 pr_err("Unable to locate text_in buffer for sendtargets" 2013 " discovery\n"); 2014 goto reject; 2015 } 2016 if (strncmp("SendTargets", text_in, 11) != 0) { 2017 pr_err("Received Text Data that is not" 2018 " SendTargets, cannot continue.\n"); 2019 goto reject; 2020 } 2021 text_ptr = strchr(text_in, '='); 2022 if (!text_ptr) { 2023 pr_err("No \"=\" separator found in Text Data," 2024 " cannot continue.\n"); 2025 goto reject; 2026 } 2027 if (!strncmp("=All", text_ptr, 4)) { 2028 cmd->cmd_flags |= IFC_SENDTARGETS_ALL; 2029 } else if (!strncmp("=iqn.", text_ptr, 5) || 2030 !strncmp("=eui.", text_ptr, 5)) { 2031 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE; 2032 } else { 2033 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2034 goto reject; 2035 } 2036 2037 spin_lock_bh(&conn->cmd_lock); 2038 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2039 spin_unlock_bh(&conn->cmd_lock); 2040 2041 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2042 2043 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2044 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2045 (unsigned char *)hdr, hdr->cmdsn); 2046 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2047 return -1; 2048 2049 return 0; 2050 } 2051 2052 return iscsit_execute_cmd(cmd, 0); 2053 2054 reject: 2055 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2056 (unsigned char *)hdr); 2057 } 2058 EXPORT_SYMBOL(iscsit_process_text_cmd); 2059 2060 static int 2061 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2062 unsigned char *buf) 2063 { 2064 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2065 char *text_in = NULL; 2066 u32 payload_length = ntoh24(hdr->dlength); 2067 int rx_size, rc; 2068 2069 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2070 if (rc < 0) 2071 return 0; 2072 2073 rx_size = payload_length; 2074 if (payload_length) { 2075 u32 checksum = 0, data_crc = 0; 2076 u32 padding = 0, pad_bytes = 0; 2077 int niov = 0, rx_got; 2078 struct kvec iov[3]; 2079 2080 text_in = kzalloc(payload_length, GFP_KERNEL); 2081 if (!text_in) { 2082 pr_err("Unable to allocate memory for" 2083 " incoming text parameters\n"); 2084 goto reject; 2085 } 2086 cmd->text_in_ptr = text_in; 2087 2088 memset(iov, 0, 3 * sizeof(struct kvec)); 2089 iov[niov].iov_base = text_in; 2090 iov[niov++].iov_len = payload_length; 2091 2092 padding = ((-payload_length) & 3); 2093 if (padding != 0) { 2094 iov[niov].iov_base = &pad_bytes; 2095 iov[niov++].iov_len = padding; 2096 rx_size += padding; 2097 pr_debug("Receiving %u additional bytes" 2098 " for padding.\n", padding); 2099 } 2100 if (conn->conn_ops->DataDigest) { 2101 iov[niov].iov_base = &checksum; 2102 iov[niov++].iov_len = ISCSI_CRC_LEN; 2103 rx_size += ISCSI_CRC_LEN; 2104 } 2105 2106 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2107 if (rx_got != rx_size) 2108 goto reject; 2109 2110 if (conn->conn_ops->DataDigest) { 2111 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2112 text_in, payload_length, 2113 padding, (u8 *)&pad_bytes, 2114 (u8 *)&data_crc); 2115 2116 if (checksum != data_crc) { 2117 pr_err("Text data CRC32C DataDigest" 2118 " 0x%08x does not match computed" 2119 " 0x%08x\n", checksum, data_crc); 2120 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2121 pr_err("Unable to recover from" 2122 " Text Data digest failure while in" 2123 " ERL=0.\n"); 2124 goto reject; 2125 } else { 2126 /* 2127 * Silently drop this PDU and let the 2128 * initiator plug the CmdSN gap. 2129 */ 2130 pr_debug("Dropping Text" 2131 " Command CmdSN: 0x%08x due to" 2132 " DataCRC error.\n", hdr->cmdsn); 2133 kfree(text_in); 2134 return 0; 2135 } 2136 } else { 2137 pr_debug("Got CRC32C DataDigest" 2138 " 0x%08x for %u bytes of text data.\n", 2139 checksum, payload_length); 2140 } 2141 } 2142 text_in[payload_length - 1] = '\0'; 2143 pr_debug("Successfully read %d bytes of text" 2144 " data.\n", payload_length); 2145 } 2146 2147 return iscsit_process_text_cmd(conn, cmd, hdr); 2148 2149 reject: 2150 kfree(cmd->text_in_ptr); 2151 cmd->text_in_ptr = NULL; 2152 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2153 } 2154 EXPORT_SYMBOL(iscsit_handle_text_cmd); 2155 2156 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2157 { 2158 struct iscsi_conn *conn_p; 2159 struct iscsi_session *sess = conn->sess; 2160 2161 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2162 " for SID: %u.\n", conn->cid, conn->sess->sid); 2163 2164 atomic_set(&sess->session_logout, 1); 2165 atomic_set(&conn->conn_logout_remove, 1); 2166 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2167 2168 iscsit_inc_conn_usage_count(conn); 2169 iscsit_inc_session_usage_count(sess); 2170 2171 spin_lock_bh(&sess->conn_lock); 2172 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2173 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2174 continue; 2175 2176 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2177 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2178 } 2179 spin_unlock_bh(&sess->conn_lock); 2180 2181 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2182 2183 return 0; 2184 } 2185 2186 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2187 { 2188 struct iscsi_conn *l_conn; 2189 struct iscsi_session *sess = conn->sess; 2190 2191 pr_debug("Received logout request CLOSECONNECTION for CID:" 2192 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2193 2194 /* 2195 * A Logout Request with a CLOSECONNECTION reason code for a CID 2196 * can arrive on a connection with a differing CID. 2197 */ 2198 if (conn->cid == cmd->logout_cid) { 2199 spin_lock_bh(&conn->state_lock); 2200 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2201 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2202 2203 atomic_set(&conn->conn_logout_remove, 1); 2204 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2205 iscsit_inc_conn_usage_count(conn); 2206 2207 spin_unlock_bh(&conn->state_lock); 2208 } else { 2209 /* 2210 * Handle all different cid CLOSECONNECTION requests in 2211 * iscsit_logout_post_handler_diffcid() as to give enough 2212 * time for any non immediate command's CmdSN to be 2213 * acknowledged on the connection in question. 2214 * 2215 * Here we simply make sure the CID is still around. 2216 */ 2217 l_conn = iscsit_get_conn_from_cid(sess, 2218 cmd->logout_cid); 2219 if (!l_conn) { 2220 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2221 iscsit_add_cmd_to_response_queue(cmd, conn, 2222 cmd->i_state); 2223 return 0; 2224 } 2225 2226 iscsit_dec_conn_usage_count(l_conn); 2227 } 2228 2229 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2230 2231 return 0; 2232 } 2233 2234 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2235 { 2236 struct iscsi_session *sess = conn->sess; 2237 2238 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2239 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2240 2241 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2242 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2243 " while ERL!=2.\n"); 2244 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2245 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2246 return 0; 2247 } 2248 2249 if (conn->cid == cmd->logout_cid) { 2250 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2251 " with CID: %hu on CID: %hu, implementation error.\n", 2252 cmd->logout_cid, conn->cid); 2253 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2254 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2255 return 0; 2256 } 2257 2258 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2259 2260 return 0; 2261 } 2262 2263 int 2264 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2265 unsigned char *buf) 2266 { 2267 int cmdsn_ret, logout_remove = 0; 2268 u8 reason_code = 0; 2269 struct iscsi_logout *hdr; 2270 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2271 2272 hdr = (struct iscsi_logout *) buf; 2273 reason_code = (hdr->flags & 0x7f); 2274 2275 if (tiqn) { 2276 spin_lock(&tiqn->logout_stats.lock); 2277 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2278 tiqn->logout_stats.normal_logouts++; 2279 else 2280 tiqn->logout_stats.abnormal_logouts++; 2281 spin_unlock(&tiqn->logout_stats.lock); 2282 } 2283 2284 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2285 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2286 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2287 hdr->cid, conn->cid); 2288 2289 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2290 pr_err("Received logout request on connection that" 2291 " is not in logged in state, ignoring request.\n"); 2292 iscsit_free_cmd(cmd, false); 2293 return 0; 2294 } 2295 2296 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2297 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2298 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2299 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2300 cmd->targ_xfer_tag = 0xFFFFFFFF; 2301 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2302 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2303 cmd->logout_cid = be16_to_cpu(hdr->cid); 2304 cmd->logout_reason = reason_code; 2305 cmd->data_direction = DMA_NONE; 2306 2307 /* 2308 * We need to sleep in these cases (by returning 1) until the Logout 2309 * Response gets sent in the tx thread. 2310 */ 2311 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2312 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2313 be16_to_cpu(hdr->cid) == conn->cid)) 2314 logout_remove = 1; 2315 2316 spin_lock_bh(&conn->cmd_lock); 2317 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2318 spin_unlock_bh(&conn->cmd_lock); 2319 2320 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2321 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2322 2323 /* 2324 * Immediate commands are executed, well, immediately. 2325 * Non-Immediate Logout Commands are executed in CmdSN order. 2326 */ 2327 if (cmd->immediate_cmd) { 2328 int ret = iscsit_execute_cmd(cmd, 0); 2329 2330 if (ret < 0) 2331 return ret; 2332 } else { 2333 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2334 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2335 logout_remove = 0; 2336 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2337 return -1; 2338 } 2339 2340 return logout_remove; 2341 } 2342 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2343 2344 static int iscsit_handle_snack( 2345 struct iscsi_conn *conn, 2346 unsigned char *buf) 2347 { 2348 struct iscsi_snack *hdr; 2349 2350 hdr = (struct iscsi_snack *) buf; 2351 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2352 2353 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2354 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2355 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2356 hdr->begrun, hdr->runlength, conn->cid); 2357 2358 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2359 pr_err("Initiator sent SNACK request while in" 2360 " ErrorRecoveryLevel=0.\n"); 2361 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2362 buf); 2363 } 2364 /* 2365 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2366 * call from inside iscsi_send_recovery_datain_or_r2t(). 2367 */ 2368 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2369 case 0: 2370 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2371 hdr->itt, 2372 be32_to_cpu(hdr->ttt), 2373 be32_to_cpu(hdr->begrun), 2374 be32_to_cpu(hdr->runlength)); 2375 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2376 return iscsit_handle_status_snack(conn, hdr->itt, 2377 be32_to_cpu(hdr->ttt), 2378 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2379 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2380 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2381 be32_to_cpu(hdr->begrun), 2382 be32_to_cpu(hdr->runlength)); 2383 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2384 /* FIXME: Support R-Data SNACK */ 2385 pr_err("R-Data SNACK Not Supported.\n"); 2386 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2387 buf); 2388 default: 2389 pr_err("Unknown SNACK type 0x%02x, protocol" 2390 " error.\n", hdr->flags & 0x0f); 2391 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2392 buf); 2393 } 2394 2395 return 0; 2396 } 2397 2398 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2399 { 2400 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2401 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2402 wait_for_completion_interruptible_timeout( 2403 &conn->rx_half_close_comp, 2404 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2405 } 2406 } 2407 2408 static int iscsit_handle_immediate_data( 2409 struct iscsi_cmd *cmd, 2410 struct iscsi_scsi_req *hdr, 2411 u32 length) 2412 { 2413 int iov_ret, rx_got = 0, rx_size = 0; 2414 u32 checksum, iov_count = 0, padding = 0; 2415 struct iscsi_conn *conn = cmd->conn; 2416 struct kvec *iov; 2417 2418 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2419 if (iov_ret < 0) 2420 return IMMEDIATE_DATA_CANNOT_RECOVER; 2421 2422 rx_size = length; 2423 iov_count = iov_ret; 2424 iov = &cmd->iov_data[0]; 2425 2426 padding = ((-length) & 3); 2427 if (padding != 0) { 2428 iov[iov_count].iov_base = cmd->pad_bytes; 2429 iov[iov_count++].iov_len = padding; 2430 rx_size += padding; 2431 } 2432 2433 if (conn->conn_ops->DataDigest) { 2434 iov[iov_count].iov_base = &checksum; 2435 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2436 rx_size += ISCSI_CRC_LEN; 2437 } 2438 2439 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2440 2441 iscsit_unmap_iovec(cmd); 2442 2443 if (rx_got != rx_size) { 2444 iscsit_rx_thread_wait_for_tcp(conn); 2445 return IMMEDIATE_DATA_CANNOT_RECOVER; 2446 } 2447 2448 if (conn->conn_ops->DataDigest) { 2449 u32 data_crc; 2450 2451 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2452 cmd->write_data_done, length, padding, 2453 cmd->pad_bytes); 2454 2455 if (checksum != data_crc) { 2456 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2457 " does not match computed 0x%08x\n", checksum, 2458 data_crc); 2459 2460 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2461 pr_err("Unable to recover from" 2462 " Immediate Data digest failure while" 2463 " in ERL=0.\n"); 2464 iscsit_reject_cmd(cmd, 2465 ISCSI_REASON_DATA_DIGEST_ERROR, 2466 (unsigned char *)hdr); 2467 return IMMEDIATE_DATA_CANNOT_RECOVER; 2468 } else { 2469 iscsit_reject_cmd(cmd, 2470 ISCSI_REASON_DATA_DIGEST_ERROR, 2471 (unsigned char *)hdr); 2472 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2473 } 2474 } else { 2475 pr_debug("Got CRC32C DataDigest 0x%08x for" 2476 " %u bytes of Immediate Data\n", checksum, 2477 length); 2478 } 2479 } 2480 2481 cmd->write_data_done += length; 2482 2483 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2484 spin_lock_bh(&cmd->istate_lock); 2485 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2486 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2487 spin_unlock_bh(&cmd->istate_lock); 2488 } 2489 2490 return IMMEDIATE_DATA_NORMAL_OPERATION; 2491 } 2492 2493 /* 2494 * Called with sess->conn_lock held. 2495 */ 2496 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2497 with active network interface */ 2498 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2499 { 2500 struct iscsi_cmd *cmd; 2501 struct iscsi_conn *conn_p; 2502 bool found = false; 2503 2504 /* 2505 * Only send a Asynchronous Message on connections whos network 2506 * interface is still functional. 2507 */ 2508 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2509 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2510 iscsit_inc_conn_usage_count(conn_p); 2511 found = true; 2512 break; 2513 } 2514 } 2515 2516 if (!found) 2517 return; 2518 2519 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2520 if (!cmd) { 2521 iscsit_dec_conn_usage_count(conn_p); 2522 return; 2523 } 2524 2525 cmd->logout_cid = conn->cid; 2526 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2527 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2528 2529 spin_lock_bh(&conn_p->cmd_lock); 2530 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2531 spin_unlock_bh(&conn_p->cmd_lock); 2532 2533 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2534 iscsit_dec_conn_usage_count(conn_p); 2535 } 2536 2537 static int iscsit_send_conn_drop_async_message( 2538 struct iscsi_cmd *cmd, 2539 struct iscsi_conn *conn) 2540 { 2541 struct iscsi_async *hdr; 2542 2543 cmd->tx_size = ISCSI_HDR_LEN; 2544 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2545 2546 hdr = (struct iscsi_async *) cmd->pdu; 2547 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2548 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2549 cmd->init_task_tag = RESERVED_ITT; 2550 cmd->targ_xfer_tag = 0xFFFFFFFF; 2551 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2552 cmd->stat_sn = conn->stat_sn++; 2553 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2554 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2555 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2556 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2557 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2558 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2559 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2560 2561 if (conn->conn_ops->HeaderDigest) { 2562 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2563 2564 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2565 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2566 2567 cmd->tx_size += ISCSI_CRC_LEN; 2568 pr_debug("Attaching CRC32C HeaderDigest to" 2569 " Async Message 0x%08x\n", *header_digest); 2570 } 2571 2572 cmd->iov_misc[0].iov_base = cmd->pdu; 2573 cmd->iov_misc[0].iov_len = cmd->tx_size; 2574 cmd->iov_misc_count = 1; 2575 2576 pr_debug("Sending Connection Dropped Async Message StatSN:" 2577 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2578 cmd->logout_cid, conn->cid); 2579 return 0; 2580 } 2581 2582 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2583 { 2584 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2585 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2586 wait_for_completion_interruptible_timeout( 2587 &conn->tx_half_close_comp, 2588 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2589 } 2590 } 2591 2592 static void 2593 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2594 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2595 bool set_statsn) 2596 { 2597 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2598 hdr->flags = datain->flags; 2599 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2600 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2601 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2602 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2603 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2604 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2605 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2606 } 2607 } 2608 hton24(hdr->dlength, datain->length); 2609 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2610 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2611 (struct scsi_lun *)&hdr->lun); 2612 else 2613 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2614 2615 hdr->itt = cmd->init_task_tag; 2616 2617 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2618 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2619 else 2620 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2621 if (set_statsn) 2622 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2623 else 2624 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2625 2626 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2627 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2628 hdr->datasn = cpu_to_be32(datain->data_sn); 2629 hdr->offset = cpu_to_be32(datain->offset); 2630 2631 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2632 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2633 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2634 ntohl(hdr->offset), datain->length, conn->cid); 2635 } 2636 2637 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2638 { 2639 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2640 struct iscsi_datain datain; 2641 struct iscsi_datain_req *dr; 2642 struct kvec *iov; 2643 u32 iov_count = 0, tx_size = 0; 2644 int eodr = 0, ret, iov_ret; 2645 bool set_statsn = false; 2646 2647 memset(&datain, 0, sizeof(struct iscsi_datain)); 2648 dr = iscsit_get_datain_values(cmd, &datain); 2649 if (!dr) { 2650 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2651 cmd->init_task_tag); 2652 return -1; 2653 } 2654 /* 2655 * Be paranoid and double check the logic for now. 2656 */ 2657 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2658 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2659 " datain.length: %u exceeds cmd->data_length: %u\n", 2660 cmd->init_task_tag, datain.offset, datain.length, 2661 cmd->se_cmd.data_length); 2662 return -1; 2663 } 2664 2665 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2666 /* 2667 * Special case for successfully execution w/ both DATAIN 2668 * and Sense Data. 2669 */ 2670 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2671 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2672 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2673 else { 2674 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2675 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2676 iscsit_increment_maxcmdsn(cmd, conn->sess); 2677 cmd->stat_sn = conn->stat_sn++; 2678 set_statsn = true; 2679 } else if (dr->dr_complete == 2680 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2681 set_statsn = true; 2682 } 2683 2684 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2685 2686 iov = &cmd->iov_data[0]; 2687 iov[iov_count].iov_base = cmd->pdu; 2688 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2689 tx_size += ISCSI_HDR_LEN; 2690 2691 if (conn->conn_ops->HeaderDigest) { 2692 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2693 2694 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2695 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2696 2697 iov[0].iov_len += ISCSI_CRC_LEN; 2698 tx_size += ISCSI_CRC_LEN; 2699 2700 pr_debug("Attaching CRC32 HeaderDigest" 2701 " for DataIN PDU 0x%08x\n", *header_digest); 2702 } 2703 2704 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2705 datain.offset, datain.length); 2706 if (iov_ret < 0) 2707 return -1; 2708 2709 iov_count += iov_ret; 2710 tx_size += datain.length; 2711 2712 cmd->padding = ((-datain.length) & 3); 2713 if (cmd->padding) { 2714 iov[iov_count].iov_base = cmd->pad_bytes; 2715 iov[iov_count++].iov_len = cmd->padding; 2716 tx_size += cmd->padding; 2717 2718 pr_debug("Attaching %u padding bytes\n", 2719 cmd->padding); 2720 } 2721 if (conn->conn_ops->DataDigest) { 2722 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2723 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2724 2725 iov[iov_count].iov_base = &cmd->data_crc; 2726 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2727 tx_size += ISCSI_CRC_LEN; 2728 2729 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2730 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2731 } 2732 2733 cmd->iov_data_count = iov_count; 2734 cmd->tx_size = tx_size; 2735 2736 /* sendpage is preferred but can't insert markers */ 2737 if (!conn->conn_ops->IFMarker) 2738 ret = iscsit_fe_sendpage_sg(cmd, conn); 2739 else 2740 ret = iscsit_send_tx_data(cmd, conn, 0); 2741 2742 iscsit_unmap_iovec(cmd); 2743 2744 if (ret < 0) { 2745 iscsit_tx_thread_wait_for_tcp(conn); 2746 return ret; 2747 } 2748 2749 if (dr->dr_complete) { 2750 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2751 2 : 1; 2752 iscsit_free_datain_req(cmd, dr); 2753 } 2754 2755 return eodr; 2756 } 2757 2758 int 2759 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2760 struct iscsi_logout_rsp *hdr) 2761 { 2762 struct iscsi_conn *logout_conn = NULL; 2763 struct iscsi_conn_recovery *cr = NULL; 2764 struct iscsi_session *sess = conn->sess; 2765 /* 2766 * The actual shutting down of Sessions and/or Connections 2767 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2768 * is done in scsi_logout_post_handler(). 2769 */ 2770 switch (cmd->logout_reason) { 2771 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2772 pr_debug("iSCSI session logout successful, setting" 2773 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2774 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2775 break; 2776 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2777 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2778 break; 2779 /* 2780 * For CLOSECONNECTION logout requests carrying 2781 * a matching logout CID -> local CID, the reference 2782 * for the local CID will have been incremented in 2783 * iscsi_logout_closeconnection(). 2784 * 2785 * For CLOSECONNECTION logout requests carrying 2786 * a different CID than the connection it arrived 2787 * on, the connection responding to cmd->logout_cid 2788 * is stopped in iscsit_logout_post_handler_diffcid(). 2789 */ 2790 2791 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2792 " successful.\n", cmd->logout_cid, conn->cid); 2793 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2794 break; 2795 case ISCSI_LOGOUT_REASON_RECOVERY: 2796 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2797 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2798 break; 2799 /* 2800 * If the connection is still active from our point of view 2801 * force connection recovery to occur. 2802 */ 2803 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2804 cmd->logout_cid); 2805 if (logout_conn) { 2806 iscsit_connection_reinstatement_rcfr(logout_conn); 2807 iscsit_dec_conn_usage_count(logout_conn); 2808 } 2809 2810 cr = iscsit_get_inactive_connection_recovery_entry( 2811 conn->sess, cmd->logout_cid); 2812 if (!cr) { 2813 pr_err("Unable to locate CID: %hu for" 2814 " REMOVECONNFORRECOVERY Logout Request.\n", 2815 cmd->logout_cid); 2816 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2817 break; 2818 } 2819 2820 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2821 2822 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2823 " for recovery for CID: %hu on CID: %hu successful.\n", 2824 cmd->logout_cid, conn->cid); 2825 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2826 break; 2827 default: 2828 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2829 cmd->logout_reason); 2830 return -1; 2831 } 2832 2833 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2834 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2835 hdr->response = cmd->logout_response; 2836 hdr->itt = cmd->init_task_tag; 2837 cmd->stat_sn = conn->stat_sn++; 2838 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2839 2840 iscsit_increment_maxcmdsn(cmd, conn->sess); 2841 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2842 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2843 2844 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2845 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2846 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2847 cmd->logout_cid, conn->cid); 2848 2849 return 0; 2850 } 2851 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2852 2853 static int 2854 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2855 { 2856 struct kvec *iov; 2857 int niov = 0, tx_size, rc; 2858 2859 rc = iscsit_build_logout_rsp(cmd, conn, 2860 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2861 if (rc < 0) 2862 return rc; 2863 2864 tx_size = ISCSI_HDR_LEN; 2865 iov = &cmd->iov_misc[0]; 2866 iov[niov].iov_base = cmd->pdu; 2867 iov[niov++].iov_len = ISCSI_HDR_LEN; 2868 2869 if (conn->conn_ops->HeaderDigest) { 2870 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2871 2872 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2873 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2874 2875 iov[0].iov_len += ISCSI_CRC_LEN; 2876 tx_size += ISCSI_CRC_LEN; 2877 pr_debug("Attaching CRC32C HeaderDigest to" 2878 " Logout Response 0x%08x\n", *header_digest); 2879 } 2880 cmd->iov_misc_count = niov; 2881 cmd->tx_size = tx_size; 2882 2883 return 0; 2884 } 2885 2886 void 2887 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2888 struct iscsi_nopin *hdr, bool nopout_response) 2889 { 2890 hdr->opcode = ISCSI_OP_NOOP_IN; 2891 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2892 hton24(hdr->dlength, cmd->buf_ptr_size); 2893 if (nopout_response) 2894 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2895 hdr->itt = cmd->init_task_tag; 2896 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2897 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2898 conn->stat_sn; 2899 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2900 2901 if (nopout_response) 2902 iscsit_increment_maxcmdsn(cmd, conn->sess); 2903 2904 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2905 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2906 2907 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2908 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2909 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2910 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2911 } 2912 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2913 2914 /* 2915 * Unsolicited NOPIN, either requesting a response or not. 2916 */ 2917 static int iscsit_send_unsolicited_nopin( 2918 struct iscsi_cmd *cmd, 2919 struct iscsi_conn *conn, 2920 int want_response) 2921 { 2922 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2923 int tx_size = ISCSI_HDR_LEN, ret; 2924 2925 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2926 2927 if (conn->conn_ops->HeaderDigest) { 2928 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2929 2930 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2931 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2932 2933 tx_size += ISCSI_CRC_LEN; 2934 pr_debug("Attaching CRC32C HeaderDigest to" 2935 " NopIN 0x%08x\n", *header_digest); 2936 } 2937 2938 cmd->iov_misc[0].iov_base = cmd->pdu; 2939 cmd->iov_misc[0].iov_len = tx_size; 2940 cmd->iov_misc_count = 1; 2941 cmd->tx_size = tx_size; 2942 2943 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2944 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2945 2946 ret = iscsit_send_tx_data(cmd, conn, 1); 2947 if (ret < 0) { 2948 iscsit_tx_thread_wait_for_tcp(conn); 2949 return ret; 2950 } 2951 2952 spin_lock_bh(&cmd->istate_lock); 2953 cmd->i_state = want_response ? 2954 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2955 spin_unlock_bh(&cmd->istate_lock); 2956 2957 return 0; 2958 } 2959 2960 static int 2961 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2962 { 2963 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2964 struct kvec *iov; 2965 u32 padding = 0; 2966 int niov = 0, tx_size; 2967 2968 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2969 2970 tx_size = ISCSI_HDR_LEN; 2971 iov = &cmd->iov_misc[0]; 2972 iov[niov].iov_base = cmd->pdu; 2973 iov[niov++].iov_len = ISCSI_HDR_LEN; 2974 2975 if (conn->conn_ops->HeaderDigest) { 2976 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2977 2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2979 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2980 2981 iov[0].iov_len += ISCSI_CRC_LEN; 2982 tx_size += ISCSI_CRC_LEN; 2983 pr_debug("Attaching CRC32C HeaderDigest" 2984 " to NopIn 0x%08x\n", *header_digest); 2985 } 2986 2987 /* 2988 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2989 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2990 */ 2991 if (cmd->buf_ptr_size) { 2992 iov[niov].iov_base = cmd->buf_ptr; 2993 iov[niov++].iov_len = cmd->buf_ptr_size; 2994 tx_size += cmd->buf_ptr_size; 2995 2996 pr_debug("Echoing back %u bytes of ping" 2997 " data.\n", cmd->buf_ptr_size); 2998 2999 padding = ((-cmd->buf_ptr_size) & 3); 3000 if (padding != 0) { 3001 iov[niov].iov_base = &cmd->pad_bytes; 3002 iov[niov++].iov_len = padding; 3003 tx_size += padding; 3004 pr_debug("Attaching %u additional" 3005 " padding bytes.\n", padding); 3006 } 3007 if (conn->conn_ops->DataDigest) { 3008 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3009 cmd->buf_ptr, cmd->buf_ptr_size, 3010 padding, (u8 *)&cmd->pad_bytes, 3011 (u8 *)&cmd->data_crc); 3012 3013 iov[niov].iov_base = &cmd->data_crc; 3014 iov[niov++].iov_len = ISCSI_CRC_LEN; 3015 tx_size += ISCSI_CRC_LEN; 3016 pr_debug("Attached DataDigest for %u" 3017 " bytes of ping data, CRC 0x%08x\n", 3018 cmd->buf_ptr_size, cmd->data_crc); 3019 } 3020 } 3021 3022 cmd->iov_misc_count = niov; 3023 cmd->tx_size = tx_size; 3024 3025 return 0; 3026 } 3027 3028 static int iscsit_send_r2t( 3029 struct iscsi_cmd *cmd, 3030 struct iscsi_conn *conn) 3031 { 3032 int tx_size = 0; 3033 struct iscsi_r2t *r2t; 3034 struct iscsi_r2t_rsp *hdr; 3035 int ret; 3036 3037 r2t = iscsit_get_r2t_from_list(cmd); 3038 if (!r2t) 3039 return -1; 3040 3041 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3042 memset(hdr, 0, ISCSI_HDR_LEN); 3043 hdr->opcode = ISCSI_OP_R2T; 3044 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3045 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3046 (struct scsi_lun *)&hdr->lun); 3047 hdr->itt = cmd->init_task_tag; 3048 spin_lock_bh(&conn->sess->ttt_lock); 3049 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3050 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 3051 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3052 spin_unlock_bh(&conn->sess->ttt_lock); 3053 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3054 hdr->statsn = cpu_to_be32(conn->stat_sn); 3055 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3056 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3057 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3058 hdr->data_offset = cpu_to_be32(r2t->offset); 3059 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3060 3061 cmd->iov_misc[0].iov_base = cmd->pdu; 3062 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3063 tx_size += ISCSI_HDR_LEN; 3064 3065 if (conn->conn_ops->HeaderDigest) { 3066 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3067 3068 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3069 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3070 3071 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3072 tx_size += ISCSI_CRC_LEN; 3073 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3074 " PDU 0x%08x\n", *header_digest); 3075 } 3076 3077 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3078 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3079 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3080 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3081 r2t->offset, r2t->xfer_len, conn->cid); 3082 3083 cmd->iov_misc_count = 1; 3084 cmd->tx_size = tx_size; 3085 3086 spin_lock_bh(&cmd->r2t_lock); 3087 r2t->sent_r2t = 1; 3088 spin_unlock_bh(&cmd->r2t_lock); 3089 3090 ret = iscsit_send_tx_data(cmd, conn, 1); 3091 if (ret < 0) { 3092 iscsit_tx_thread_wait_for_tcp(conn); 3093 return ret; 3094 } 3095 3096 spin_lock_bh(&cmd->dataout_timeout_lock); 3097 iscsit_start_dataout_timer(cmd, conn); 3098 spin_unlock_bh(&cmd->dataout_timeout_lock); 3099 3100 return 0; 3101 } 3102 3103 /* 3104 * @recovery: If called from iscsi_task_reassign_complete_write() for 3105 * connection recovery. 3106 */ 3107 int iscsit_build_r2ts_for_cmd( 3108 struct iscsi_conn *conn, 3109 struct iscsi_cmd *cmd, 3110 bool recovery) 3111 { 3112 int first_r2t = 1; 3113 u32 offset = 0, xfer_len = 0; 3114 3115 spin_lock_bh(&cmd->r2t_lock); 3116 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3117 spin_unlock_bh(&cmd->r2t_lock); 3118 return 0; 3119 } 3120 3121 if (conn->sess->sess_ops->DataSequenceInOrder && 3122 !recovery) 3123 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3124 3125 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3126 if (conn->sess->sess_ops->DataSequenceInOrder) { 3127 offset = cmd->r2t_offset; 3128 3129 if (first_r2t && recovery) { 3130 int new_data_end = offset + 3131 conn->sess->sess_ops->MaxBurstLength - 3132 cmd->next_burst_len; 3133 3134 if (new_data_end > cmd->se_cmd.data_length) 3135 xfer_len = cmd->se_cmd.data_length - offset; 3136 else 3137 xfer_len = 3138 conn->sess->sess_ops->MaxBurstLength - 3139 cmd->next_burst_len; 3140 } else { 3141 int new_data_end = offset + 3142 conn->sess->sess_ops->MaxBurstLength; 3143 3144 if (new_data_end > cmd->se_cmd.data_length) 3145 xfer_len = cmd->se_cmd.data_length - offset; 3146 else 3147 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3148 } 3149 cmd->r2t_offset += xfer_len; 3150 3151 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3153 } else { 3154 struct iscsi_seq *seq; 3155 3156 seq = iscsit_get_seq_holder_for_r2t(cmd); 3157 if (!seq) { 3158 spin_unlock_bh(&cmd->r2t_lock); 3159 return -1; 3160 } 3161 3162 offset = seq->offset; 3163 xfer_len = seq->xfer_len; 3164 3165 if (cmd->seq_send_order == cmd->seq_count) 3166 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3167 } 3168 cmd->outstanding_r2ts++; 3169 first_r2t = 0; 3170 3171 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3172 spin_unlock_bh(&cmd->r2t_lock); 3173 return -1; 3174 } 3175 3176 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3177 break; 3178 } 3179 spin_unlock_bh(&cmd->r2t_lock); 3180 3181 return 0; 3182 } 3183 3184 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3185 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3186 { 3187 if (inc_stat_sn) 3188 cmd->stat_sn = conn->stat_sn++; 3189 3190 atomic_long_inc(&conn->sess->rsp_pdus); 3191 3192 memset(hdr, 0, ISCSI_HDR_LEN); 3193 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3194 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3195 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3196 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3197 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3198 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3199 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3200 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3201 } 3202 hdr->response = cmd->iscsi_response; 3203 hdr->cmd_status = cmd->se_cmd.scsi_status; 3204 hdr->itt = cmd->init_task_tag; 3205 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3206 3207 iscsit_increment_maxcmdsn(cmd, conn->sess); 3208 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3209 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3210 3211 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3212 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3213 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3214 cmd->se_cmd.scsi_status, conn->cid); 3215 } 3216 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3217 3218 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3219 { 3220 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3221 struct kvec *iov; 3222 u32 padding = 0, tx_size = 0; 3223 int iov_count = 0; 3224 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3225 3226 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3227 3228 iov = &cmd->iov_misc[0]; 3229 iov[iov_count].iov_base = cmd->pdu; 3230 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3231 tx_size += ISCSI_HDR_LEN; 3232 3233 /* 3234 * Attach SENSE DATA payload to iSCSI Response PDU 3235 */ 3236 if (cmd->se_cmd.sense_buffer && 3237 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3238 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3239 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3240 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3241 3242 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3243 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3244 iov[iov_count].iov_base = cmd->sense_buffer; 3245 iov[iov_count++].iov_len = 3246 (cmd->se_cmd.scsi_sense_length + padding); 3247 tx_size += cmd->se_cmd.scsi_sense_length; 3248 3249 if (padding) { 3250 memset(cmd->sense_buffer + 3251 cmd->se_cmd.scsi_sense_length, 0, padding); 3252 tx_size += padding; 3253 pr_debug("Adding %u bytes of padding to" 3254 " SENSE.\n", padding); 3255 } 3256 3257 if (conn->conn_ops->DataDigest) { 3258 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3259 cmd->sense_buffer, 3260 (cmd->se_cmd.scsi_sense_length + padding), 3261 0, NULL, (u8 *)&cmd->data_crc); 3262 3263 iov[iov_count].iov_base = &cmd->data_crc; 3264 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3265 tx_size += ISCSI_CRC_LEN; 3266 3267 pr_debug("Attaching CRC32 DataDigest for" 3268 " SENSE, %u bytes CRC 0x%08x\n", 3269 (cmd->se_cmd.scsi_sense_length + padding), 3270 cmd->data_crc); 3271 } 3272 3273 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3274 " Response PDU\n", 3275 cmd->se_cmd.scsi_sense_length); 3276 } 3277 3278 if (conn->conn_ops->HeaderDigest) { 3279 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3280 3281 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3282 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3283 3284 iov[0].iov_len += ISCSI_CRC_LEN; 3285 tx_size += ISCSI_CRC_LEN; 3286 pr_debug("Attaching CRC32 HeaderDigest for Response" 3287 " PDU 0x%08x\n", *header_digest); 3288 } 3289 3290 cmd->iov_misc_count = iov_count; 3291 cmd->tx_size = tx_size; 3292 3293 return 0; 3294 } 3295 3296 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3297 { 3298 switch (se_tmr->response) { 3299 case TMR_FUNCTION_COMPLETE: 3300 return ISCSI_TMF_RSP_COMPLETE; 3301 case TMR_TASK_DOES_NOT_EXIST: 3302 return ISCSI_TMF_RSP_NO_TASK; 3303 case TMR_LUN_DOES_NOT_EXIST: 3304 return ISCSI_TMF_RSP_NO_LUN; 3305 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3306 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3307 case TMR_FUNCTION_REJECTED: 3308 default: 3309 return ISCSI_TMF_RSP_REJECTED; 3310 } 3311 } 3312 3313 void 3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3315 struct iscsi_tm_rsp *hdr) 3316 { 3317 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3318 3319 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3320 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3321 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3322 hdr->itt = cmd->init_task_tag; 3323 cmd->stat_sn = conn->stat_sn++; 3324 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3325 3326 iscsit_increment_maxcmdsn(cmd, conn->sess); 3327 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3328 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3329 3330 pr_debug("Built Task Management Response ITT: 0x%08x," 3331 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3332 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3333 } 3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3335 3336 static int 3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3338 { 3339 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3340 u32 tx_size = 0; 3341 3342 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3343 3344 cmd->iov_misc[0].iov_base = cmd->pdu; 3345 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3346 tx_size += ISCSI_HDR_LEN; 3347 3348 if (conn->conn_ops->HeaderDigest) { 3349 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3350 3351 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3352 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3353 3354 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3355 tx_size += ISCSI_CRC_LEN; 3356 pr_debug("Attaching CRC32 HeaderDigest for Task" 3357 " Mgmt Response PDU 0x%08x\n", *header_digest); 3358 } 3359 3360 cmd->iov_misc_count = 1; 3361 cmd->tx_size = tx_size; 3362 3363 return 0; 3364 } 3365 3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3367 { 3368 bool ret = false; 3369 3370 if (np->np_sockaddr.ss_family == AF_INET6) { 3371 const struct sockaddr_in6 sin6 = { 3372 .sin6_addr = IN6ADDR_ANY_INIT }; 3373 struct sockaddr_in6 *sock_in6 = 3374 (struct sockaddr_in6 *)&np->np_sockaddr; 3375 3376 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3377 sin6.sin6_addr.s6_addr, 16)) 3378 ret = true; 3379 } else { 3380 struct sockaddr_in * sock_in = 3381 (struct sockaddr_in *)&np->np_sockaddr; 3382 3383 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3384 ret = true; 3385 } 3386 3387 return ret; 3388 } 3389 3390 #define SENDTARGETS_BUF_LIMIT 32768U 3391 3392 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) 3393 { 3394 char *payload = NULL; 3395 struct iscsi_conn *conn = cmd->conn; 3396 struct iscsi_portal_group *tpg; 3397 struct iscsi_tiqn *tiqn; 3398 struct iscsi_tpg_np *tpg_np; 3399 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3400 int target_name_printed; 3401 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3402 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3403 3404 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3405 SENDTARGETS_BUF_LIMIT); 3406 3407 payload = kzalloc(buffer_len, GFP_KERNEL); 3408 if (!payload) { 3409 pr_err("Unable to allocate memory for sendtargets" 3410 " response.\n"); 3411 return -ENOMEM; 3412 } 3413 /* 3414 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE 3415 * explicit case.. 3416 */ 3417 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) { 3418 text_ptr = strchr(text_in, '='); 3419 if (!text_ptr) { 3420 pr_err("Unable to locate '=' string in text_in:" 3421 " %s\n", text_in); 3422 kfree(payload); 3423 return -EINVAL; 3424 } 3425 /* 3426 * Skip over '=' character.. 3427 */ 3428 text_ptr += 1; 3429 } 3430 3431 spin_lock(&tiqn_lock); 3432 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3433 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) && 3434 strcmp(tiqn->tiqn, text_ptr)) { 3435 continue; 3436 } 3437 3438 target_name_printed = 0; 3439 3440 spin_lock(&tiqn->tiqn_tpg_lock); 3441 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3442 3443 /* If demo_mode_discovery=0 and generate_node_acls=0 3444 * (demo mode dislabed) do not return 3445 * TargetName+TargetAddress unless a NodeACL exists. 3446 */ 3447 3448 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3449 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3450 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg, 3451 cmd->conn->sess->sess_ops->InitiatorName))) { 3452 continue; 3453 } 3454 3455 spin_lock(&tpg->tpg_state_lock); 3456 if ((tpg->tpg_state == TPG_STATE_FREE) || 3457 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3458 spin_unlock(&tpg->tpg_state_lock); 3459 continue; 3460 } 3461 spin_unlock(&tpg->tpg_state_lock); 3462 3463 spin_lock(&tpg->tpg_np_lock); 3464 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3465 tpg_np_list) { 3466 struct iscsi_np *np = tpg_np->tpg_np; 3467 bool inaddr_any = iscsit_check_inaddr_any(np); 3468 3469 if (!target_name_printed) { 3470 len = sprintf(buf, "TargetName=%s", 3471 tiqn->tiqn); 3472 len += 1; 3473 3474 if ((len + payload_len) > buffer_len) { 3475 spin_unlock(&tpg->tpg_np_lock); 3476 spin_unlock(&tiqn->tiqn_tpg_lock); 3477 end_of_buf = 1; 3478 goto eob; 3479 } 3480 memcpy(payload + payload_len, buf, len); 3481 payload_len += len; 3482 target_name_printed = 1; 3483 } 3484 3485 len = sprintf(buf, "TargetAddress=" 3486 "%s:%hu,%hu", 3487 (inaddr_any == false) ? 3488 np->np_ip : conn->local_ip, 3489 (inaddr_any == false) ? 3490 np->np_port : conn->local_port, 3491 tpg->tpgt); 3492 len += 1; 3493 3494 if ((len + payload_len) > buffer_len) { 3495 spin_unlock(&tpg->tpg_np_lock); 3496 spin_unlock(&tiqn->tiqn_tpg_lock); 3497 end_of_buf = 1; 3498 goto eob; 3499 } 3500 memcpy(payload + payload_len, buf, len); 3501 payload_len += len; 3502 } 3503 spin_unlock(&tpg->tpg_np_lock); 3504 } 3505 spin_unlock(&tiqn->tiqn_tpg_lock); 3506 eob: 3507 if (end_of_buf) 3508 break; 3509 3510 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) 3511 break; 3512 } 3513 spin_unlock(&tiqn_lock); 3514 3515 cmd->buf_ptr = payload; 3516 3517 return payload_len; 3518 } 3519 3520 int 3521 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3522 struct iscsi_text_rsp *hdr) 3523 { 3524 int text_length, padding; 3525 3526 text_length = iscsit_build_sendtargets_response(cmd); 3527 if (text_length < 0) 3528 return text_length; 3529 3530 hdr->opcode = ISCSI_OP_TEXT_RSP; 3531 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3532 padding = ((-text_length) & 3); 3533 hton24(hdr->dlength, text_length); 3534 hdr->itt = cmd->init_task_tag; 3535 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3536 cmd->stat_sn = conn->stat_sn++; 3537 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3538 3539 iscsit_increment_maxcmdsn(cmd, conn->sess); 3540 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3541 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3542 3543 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3544 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3545 text_length, conn->cid); 3546 3547 return text_length + padding; 3548 } 3549 EXPORT_SYMBOL(iscsit_build_text_rsp); 3550 3551 /* 3552 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3553 * MaxRecvDataSegmentLength. 3554 */ 3555 static int iscsit_send_text_rsp( 3556 struct iscsi_cmd *cmd, 3557 struct iscsi_conn *conn) 3558 { 3559 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3560 struct kvec *iov; 3561 u32 tx_size = 0; 3562 int text_length, iov_count = 0, rc; 3563 3564 rc = iscsit_build_text_rsp(cmd, conn, hdr); 3565 if (rc < 0) 3566 return rc; 3567 3568 text_length = rc; 3569 iov = &cmd->iov_misc[0]; 3570 iov[iov_count].iov_base = cmd->pdu; 3571 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3572 iov[iov_count].iov_base = cmd->buf_ptr; 3573 iov[iov_count++].iov_len = text_length; 3574 3575 tx_size += (ISCSI_HDR_LEN + text_length); 3576 3577 if (conn->conn_ops->HeaderDigest) { 3578 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3579 3580 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3581 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3582 3583 iov[0].iov_len += ISCSI_CRC_LEN; 3584 tx_size += ISCSI_CRC_LEN; 3585 pr_debug("Attaching CRC32 HeaderDigest for" 3586 " Text Response PDU 0x%08x\n", *header_digest); 3587 } 3588 3589 if (conn->conn_ops->DataDigest) { 3590 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3591 cmd->buf_ptr, text_length, 3592 0, NULL, (u8 *)&cmd->data_crc); 3593 3594 iov[iov_count].iov_base = &cmd->data_crc; 3595 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3596 tx_size += ISCSI_CRC_LEN; 3597 3598 pr_debug("Attaching DataDigest for %u bytes of text" 3599 " data, CRC 0x%08x\n", text_length, 3600 cmd->data_crc); 3601 } 3602 3603 cmd->iov_misc_count = iov_count; 3604 cmd->tx_size = tx_size; 3605 3606 return 0; 3607 } 3608 3609 void 3610 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3611 struct iscsi_reject *hdr) 3612 { 3613 hdr->opcode = ISCSI_OP_REJECT; 3614 hdr->reason = cmd->reject_reason; 3615 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3616 hton24(hdr->dlength, ISCSI_HDR_LEN); 3617 hdr->ffffffff = cpu_to_be32(0xffffffff); 3618 cmd->stat_sn = conn->stat_sn++; 3619 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3620 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3621 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3622 3623 } 3624 EXPORT_SYMBOL(iscsit_build_reject); 3625 3626 static int iscsit_send_reject( 3627 struct iscsi_cmd *cmd, 3628 struct iscsi_conn *conn) 3629 { 3630 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3631 struct kvec *iov; 3632 u32 iov_count = 0, tx_size; 3633 3634 iscsit_build_reject(cmd, conn, hdr); 3635 3636 iov = &cmd->iov_misc[0]; 3637 iov[iov_count].iov_base = cmd->pdu; 3638 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3639 iov[iov_count].iov_base = cmd->buf_ptr; 3640 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3641 3642 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3643 3644 if (conn->conn_ops->HeaderDigest) { 3645 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3646 3647 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3648 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3649 3650 iov[0].iov_len += ISCSI_CRC_LEN; 3651 tx_size += ISCSI_CRC_LEN; 3652 pr_debug("Attaching CRC32 HeaderDigest for" 3653 " REJECT PDU 0x%08x\n", *header_digest); 3654 } 3655 3656 if (conn->conn_ops->DataDigest) { 3657 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3658 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3659 3660 iov[iov_count].iov_base = &cmd->data_crc; 3661 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3662 tx_size += ISCSI_CRC_LEN; 3663 pr_debug("Attaching CRC32 DataDigest for REJECT" 3664 " PDU 0x%08x\n", cmd->data_crc); 3665 } 3666 3667 cmd->iov_misc_count = iov_count; 3668 cmd->tx_size = tx_size; 3669 3670 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3671 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3672 3673 return 0; 3674 } 3675 3676 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3677 { 3678 struct iscsi_thread_set *ts = conn->thread_set; 3679 int ord, cpu; 3680 /* 3681 * thread_id is assigned from iscsit_global->ts_bitmap from 3682 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3683 * 3684 * Here we use thread_id to determine which CPU that this 3685 * iSCSI connection's iscsi_thread_set will be scheduled to 3686 * execute upon. 3687 */ 3688 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3689 for_each_online_cpu(cpu) { 3690 if (ord-- == 0) { 3691 cpumask_set_cpu(cpu, conn->conn_cpumask); 3692 return; 3693 } 3694 } 3695 /* 3696 * This should never be reached.. 3697 */ 3698 dump_stack(); 3699 cpumask_setall(conn->conn_cpumask); 3700 } 3701 3702 static inline void iscsit_thread_check_cpumask( 3703 struct iscsi_conn *conn, 3704 struct task_struct *p, 3705 int mode) 3706 { 3707 char buf[128]; 3708 /* 3709 * mode == 1 signals iscsi_target_tx_thread() usage. 3710 * mode == 0 signals iscsi_target_rx_thread() usage. 3711 */ 3712 if (mode == 1) { 3713 if (!conn->conn_tx_reset_cpumask) 3714 return; 3715 conn->conn_tx_reset_cpumask = 0; 3716 } else { 3717 if (!conn->conn_rx_reset_cpumask) 3718 return; 3719 conn->conn_rx_reset_cpumask = 0; 3720 } 3721 /* 3722 * Update the CPU mask for this single kthread so that 3723 * both TX and RX kthreads are scheduled to run on the 3724 * same CPU. 3725 */ 3726 memset(buf, 0, 128); 3727 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3728 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3729 } 3730 3731 static int 3732 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3733 { 3734 int ret; 3735 3736 switch (state) { 3737 case ISTATE_SEND_R2T: 3738 ret = iscsit_send_r2t(cmd, conn); 3739 if (ret < 0) 3740 goto err; 3741 break; 3742 case ISTATE_REMOVE: 3743 spin_lock_bh(&conn->cmd_lock); 3744 list_del_init(&cmd->i_conn_node); 3745 spin_unlock_bh(&conn->cmd_lock); 3746 3747 iscsit_free_cmd(cmd, false); 3748 break; 3749 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3750 iscsit_mod_nopin_response_timer(conn); 3751 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3752 if (ret < 0) 3753 goto err; 3754 break; 3755 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3756 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3757 if (ret < 0) 3758 goto err; 3759 break; 3760 default: 3761 pr_err("Unknown Opcode: 0x%02x ITT:" 3762 " 0x%08x, i_state: %d on CID: %hu\n", 3763 cmd->iscsi_opcode, cmd->init_task_tag, state, 3764 conn->cid); 3765 goto err; 3766 } 3767 3768 return 0; 3769 3770 err: 3771 return -1; 3772 } 3773 3774 static int 3775 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3776 { 3777 struct iscsit_transport *t = conn->conn_transport; 3778 struct iscsi_queue_req *qr; 3779 struct iscsi_cmd *cmd; 3780 u8 state; 3781 int ret; 3782 3783 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3784 atomic_set(&conn->check_immediate_queue, 0); 3785 cmd = qr->cmd; 3786 state = qr->state; 3787 kmem_cache_free(lio_qr_cache, qr); 3788 3789 ret = t->iscsit_immediate_queue(conn, cmd, state); 3790 if (ret < 0) 3791 return ret; 3792 } 3793 3794 return 0; 3795 } 3796 3797 static int 3798 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3799 { 3800 int ret; 3801 3802 check_rsp_state: 3803 switch (state) { 3804 case ISTATE_SEND_DATAIN: 3805 ret = iscsit_send_datain(cmd, conn); 3806 if (ret < 0) 3807 goto err; 3808 else if (!ret) 3809 /* more drs */ 3810 goto check_rsp_state; 3811 else if (ret == 1) { 3812 /* all done */ 3813 spin_lock_bh(&cmd->istate_lock); 3814 cmd->i_state = ISTATE_SENT_STATUS; 3815 spin_unlock_bh(&cmd->istate_lock); 3816 3817 if (atomic_read(&conn->check_immediate_queue)) 3818 return 1; 3819 3820 return 0; 3821 } else if (ret == 2) { 3822 /* Still must send status, 3823 SCF_TRANSPORT_TASK_SENSE was set */ 3824 spin_lock_bh(&cmd->istate_lock); 3825 cmd->i_state = ISTATE_SEND_STATUS; 3826 spin_unlock_bh(&cmd->istate_lock); 3827 state = ISTATE_SEND_STATUS; 3828 goto check_rsp_state; 3829 } 3830 3831 break; 3832 case ISTATE_SEND_STATUS: 3833 case ISTATE_SEND_STATUS_RECOVERY: 3834 ret = iscsit_send_response(cmd, conn); 3835 break; 3836 case ISTATE_SEND_LOGOUTRSP: 3837 ret = iscsit_send_logout(cmd, conn); 3838 break; 3839 case ISTATE_SEND_ASYNCMSG: 3840 ret = iscsit_send_conn_drop_async_message( 3841 cmd, conn); 3842 break; 3843 case ISTATE_SEND_NOPIN: 3844 ret = iscsit_send_nopin(cmd, conn); 3845 break; 3846 case ISTATE_SEND_REJECT: 3847 ret = iscsit_send_reject(cmd, conn); 3848 break; 3849 case ISTATE_SEND_TASKMGTRSP: 3850 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3851 if (ret != 0) 3852 break; 3853 ret = iscsit_tmr_post_handler(cmd, conn); 3854 if (ret != 0) 3855 iscsit_fall_back_to_erl0(conn->sess); 3856 break; 3857 case ISTATE_SEND_TEXTRSP: 3858 ret = iscsit_send_text_rsp(cmd, conn); 3859 break; 3860 default: 3861 pr_err("Unknown Opcode: 0x%02x ITT:" 3862 " 0x%08x, i_state: %d on CID: %hu\n", 3863 cmd->iscsi_opcode, cmd->init_task_tag, 3864 state, conn->cid); 3865 goto err; 3866 } 3867 if (ret < 0) 3868 goto err; 3869 3870 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3871 iscsit_tx_thread_wait_for_tcp(conn); 3872 iscsit_unmap_iovec(cmd); 3873 goto err; 3874 } 3875 iscsit_unmap_iovec(cmd); 3876 3877 switch (state) { 3878 case ISTATE_SEND_LOGOUTRSP: 3879 if (!iscsit_logout_post_handler(cmd, conn)) 3880 goto restart; 3881 /* fall through */ 3882 case ISTATE_SEND_STATUS: 3883 case ISTATE_SEND_ASYNCMSG: 3884 case ISTATE_SEND_NOPIN: 3885 case ISTATE_SEND_STATUS_RECOVERY: 3886 case ISTATE_SEND_TEXTRSP: 3887 case ISTATE_SEND_TASKMGTRSP: 3888 case ISTATE_SEND_REJECT: 3889 spin_lock_bh(&cmd->istate_lock); 3890 cmd->i_state = ISTATE_SENT_STATUS; 3891 spin_unlock_bh(&cmd->istate_lock); 3892 break; 3893 default: 3894 pr_err("Unknown Opcode: 0x%02x ITT:" 3895 " 0x%08x, i_state: %d on CID: %hu\n", 3896 cmd->iscsi_opcode, cmd->init_task_tag, 3897 cmd->i_state, conn->cid); 3898 goto err; 3899 } 3900 3901 if (atomic_read(&conn->check_immediate_queue)) 3902 return 1; 3903 3904 return 0; 3905 3906 err: 3907 return -1; 3908 restart: 3909 return -EAGAIN; 3910 } 3911 3912 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3913 { 3914 struct iscsit_transport *t = conn->conn_transport; 3915 struct iscsi_queue_req *qr; 3916 struct iscsi_cmd *cmd; 3917 u8 state; 3918 int ret; 3919 3920 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3921 cmd = qr->cmd; 3922 state = qr->state; 3923 kmem_cache_free(lio_qr_cache, qr); 3924 3925 ret = t->iscsit_response_queue(conn, cmd, state); 3926 if (ret == 1 || ret < 0) 3927 return ret; 3928 } 3929 3930 return 0; 3931 } 3932 3933 int iscsi_target_tx_thread(void *arg) 3934 { 3935 int ret = 0; 3936 struct iscsi_conn *conn; 3937 struct iscsi_thread_set *ts = arg; 3938 /* 3939 * Allow ourselves to be interrupted by SIGINT so that a 3940 * connection recovery / failure event can be triggered externally. 3941 */ 3942 allow_signal(SIGINT); 3943 3944 restart: 3945 conn = iscsi_tx_thread_pre_handler(ts); 3946 if (!conn) 3947 goto out; 3948 3949 ret = 0; 3950 3951 while (!kthread_should_stop()) { 3952 /* 3953 * Ensure that both TX and RX per connection kthreads 3954 * are scheduled to run on the same CPU. 3955 */ 3956 iscsit_thread_check_cpumask(conn, current, 1); 3957 3958 wait_event_interruptible(conn->queues_wq, 3959 !iscsit_conn_all_queues_empty(conn) || 3960 ts->status == ISCSI_THREAD_SET_RESET); 3961 3962 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3963 signal_pending(current)) 3964 goto transport_err; 3965 3966 get_immediate: 3967 ret = iscsit_handle_immediate_queue(conn); 3968 if (ret < 0) 3969 goto transport_err; 3970 3971 ret = iscsit_handle_response_queue(conn); 3972 if (ret == 1) 3973 goto get_immediate; 3974 else if (ret == -EAGAIN) 3975 goto restart; 3976 else if (ret < 0) 3977 goto transport_err; 3978 } 3979 3980 transport_err: 3981 iscsit_take_action_for_connection_exit(conn); 3982 goto restart; 3983 out: 3984 return 0; 3985 } 3986 3987 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3988 { 3989 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3990 struct iscsi_cmd *cmd; 3991 int ret = 0; 3992 3993 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3994 case ISCSI_OP_SCSI_CMD: 3995 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3996 if (!cmd) 3997 goto reject; 3998 3999 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 4000 break; 4001 case ISCSI_OP_SCSI_DATA_OUT: 4002 ret = iscsit_handle_data_out(conn, buf); 4003 break; 4004 case ISCSI_OP_NOOP_OUT: 4005 cmd = NULL; 4006 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 4007 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4008 if (!cmd) 4009 goto reject; 4010 } 4011 ret = iscsit_handle_nop_out(conn, cmd, buf); 4012 break; 4013 case ISCSI_OP_SCSI_TMFUNC: 4014 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4015 if (!cmd) 4016 goto reject; 4017 4018 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 4019 break; 4020 case ISCSI_OP_TEXT: 4021 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4022 if (!cmd) 4023 goto reject; 4024 4025 ret = iscsit_handle_text_cmd(conn, cmd, buf); 4026 break; 4027 case ISCSI_OP_LOGOUT: 4028 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4029 if (!cmd) 4030 goto reject; 4031 4032 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4033 if (ret > 0) 4034 wait_for_completion_timeout(&conn->conn_logout_comp, 4035 SECONDS_FOR_LOGOUT_COMP * HZ); 4036 break; 4037 case ISCSI_OP_SNACK: 4038 ret = iscsit_handle_snack(conn, buf); 4039 break; 4040 default: 4041 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4042 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4043 pr_err("Cannot recover from unknown" 4044 " opcode while ERL=0, closing iSCSI connection.\n"); 4045 return -1; 4046 } 4047 if (!conn->conn_ops->OFMarker) { 4048 pr_err("Unable to recover from unknown" 4049 " opcode while OFMarker=No, closing iSCSI" 4050 " connection.\n"); 4051 return -1; 4052 } 4053 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 4054 pr_err("Unable to recover from unknown" 4055 " opcode, closing iSCSI connection.\n"); 4056 return -1; 4057 } 4058 break; 4059 } 4060 4061 return ret; 4062 reject: 4063 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4064 } 4065 4066 int iscsi_target_rx_thread(void *arg) 4067 { 4068 int ret; 4069 u8 buffer[ISCSI_HDR_LEN], opcode; 4070 u32 checksum = 0, digest = 0; 4071 struct iscsi_conn *conn = NULL; 4072 struct iscsi_thread_set *ts = arg; 4073 struct kvec iov; 4074 /* 4075 * Allow ourselves to be interrupted by SIGINT so that a 4076 * connection recovery / failure event can be triggered externally. 4077 */ 4078 allow_signal(SIGINT); 4079 4080 restart: 4081 conn = iscsi_rx_thread_pre_handler(ts); 4082 if (!conn) 4083 goto out; 4084 4085 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4086 struct completion comp; 4087 int rc; 4088 4089 init_completion(&comp); 4090 rc = wait_for_completion_interruptible(&comp); 4091 if (rc < 0) 4092 goto transport_err; 4093 4094 goto out; 4095 } 4096 4097 while (!kthread_should_stop()) { 4098 /* 4099 * Ensure that both TX and RX per connection kthreads 4100 * are scheduled to run on the same CPU. 4101 */ 4102 iscsit_thread_check_cpumask(conn, current, 0); 4103 4104 memset(buffer, 0, ISCSI_HDR_LEN); 4105 memset(&iov, 0, sizeof(struct kvec)); 4106 4107 iov.iov_base = buffer; 4108 iov.iov_len = ISCSI_HDR_LEN; 4109 4110 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4111 if (ret != ISCSI_HDR_LEN) { 4112 iscsit_rx_thread_wait_for_tcp(conn); 4113 goto transport_err; 4114 } 4115 4116 if (conn->conn_ops->HeaderDigest) { 4117 iov.iov_base = &digest; 4118 iov.iov_len = ISCSI_CRC_LEN; 4119 4120 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4121 if (ret != ISCSI_CRC_LEN) { 4122 iscsit_rx_thread_wait_for_tcp(conn); 4123 goto transport_err; 4124 } 4125 4126 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4127 buffer, ISCSI_HDR_LEN, 4128 0, NULL, (u8 *)&checksum); 4129 4130 if (digest != checksum) { 4131 pr_err("HeaderDigest CRC32C failed," 4132 " received 0x%08x, computed 0x%08x\n", 4133 digest, checksum); 4134 /* 4135 * Set the PDU to 0xff so it will intentionally 4136 * hit default in the switch below. 4137 */ 4138 memset(buffer, 0xff, ISCSI_HDR_LEN); 4139 atomic_long_inc(&conn->sess->conn_digest_errors); 4140 } else { 4141 pr_debug("Got HeaderDigest CRC32C" 4142 " 0x%08x\n", checksum); 4143 } 4144 } 4145 4146 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4147 goto transport_err; 4148 4149 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4150 4151 if (conn->sess->sess_ops->SessionType && 4152 ((!(opcode & ISCSI_OP_TEXT)) || 4153 (!(opcode & ISCSI_OP_LOGOUT)))) { 4154 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4155 " while in Discovery Session, rejecting.\n", opcode); 4156 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4157 buffer); 4158 goto transport_err; 4159 } 4160 4161 ret = iscsi_target_rx_opcode(conn, buffer); 4162 if (ret < 0) 4163 goto transport_err; 4164 } 4165 4166 transport_err: 4167 if (!signal_pending(current)) 4168 atomic_set(&conn->transport_failed, 1); 4169 iscsit_take_action_for_connection_exit(conn); 4170 goto restart; 4171 out: 4172 return 0; 4173 } 4174 4175 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4176 { 4177 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4178 struct iscsi_session *sess = conn->sess; 4179 /* 4180 * We expect this function to only ever be called from either RX or TX 4181 * thread context via iscsit_close_connection() once the other context 4182 * has been reset -> returned sleeping pre-handler state. 4183 */ 4184 spin_lock_bh(&conn->cmd_lock); 4185 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4186 4187 list_del_init(&cmd->i_conn_node); 4188 spin_unlock_bh(&conn->cmd_lock); 4189 4190 iscsit_increment_maxcmdsn(cmd, sess); 4191 4192 iscsit_free_cmd(cmd, true); 4193 4194 spin_lock_bh(&conn->cmd_lock); 4195 } 4196 spin_unlock_bh(&conn->cmd_lock); 4197 } 4198 4199 static void iscsit_stop_timers_for_cmds( 4200 struct iscsi_conn *conn) 4201 { 4202 struct iscsi_cmd *cmd; 4203 4204 spin_lock_bh(&conn->cmd_lock); 4205 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4206 if (cmd->data_direction == DMA_TO_DEVICE) 4207 iscsit_stop_dataout_timer(cmd); 4208 } 4209 spin_unlock_bh(&conn->cmd_lock); 4210 } 4211 4212 int iscsit_close_connection( 4213 struct iscsi_conn *conn) 4214 { 4215 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4216 struct iscsi_session *sess = conn->sess; 4217 4218 pr_debug("Closing iSCSI connection CID %hu on SID:" 4219 " %u\n", conn->cid, sess->sid); 4220 /* 4221 * Always up conn_logout_comp just in case the RX Thread is sleeping 4222 * and the logout response never got sent because the connection 4223 * failed. 4224 */ 4225 complete(&conn->conn_logout_comp); 4226 4227 iscsi_release_thread_set(conn); 4228 4229 iscsit_stop_timers_for_cmds(conn); 4230 iscsit_stop_nopin_response_timer(conn); 4231 iscsit_stop_nopin_timer(conn); 4232 4233 if (conn->conn_transport->iscsit_wait_conn) 4234 conn->conn_transport->iscsit_wait_conn(conn); 4235 4236 iscsit_free_queue_reqs_for_conn(conn); 4237 4238 /* 4239 * During Connection recovery drop unacknowledged out of order 4240 * commands for this connection, and prepare the other commands 4241 * for realligence. 4242 * 4243 * During normal operation clear the out of order commands (but 4244 * do not free the struct iscsi_ooo_cmdsn's) and release all 4245 * struct iscsi_cmds. 4246 */ 4247 if (atomic_read(&conn->connection_recovery)) { 4248 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4249 iscsit_prepare_cmds_for_realligance(conn); 4250 } else { 4251 iscsit_clear_ooo_cmdsns_for_conn(conn); 4252 iscsit_release_commands_from_conn(conn); 4253 } 4254 4255 /* 4256 * Handle decrementing session or connection usage count if 4257 * a logout response was not able to be sent because the 4258 * connection failed. Fall back to Session Recovery here. 4259 */ 4260 if (atomic_read(&conn->conn_logout_remove)) { 4261 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4262 iscsit_dec_conn_usage_count(conn); 4263 iscsit_dec_session_usage_count(sess); 4264 } 4265 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4266 iscsit_dec_conn_usage_count(conn); 4267 4268 atomic_set(&conn->conn_logout_remove, 0); 4269 atomic_set(&sess->session_reinstatement, 0); 4270 atomic_set(&sess->session_fall_back_to_erl0, 1); 4271 } 4272 4273 spin_lock_bh(&sess->conn_lock); 4274 list_del(&conn->conn_list); 4275 4276 /* 4277 * Attempt to let the Initiator know this connection failed by 4278 * sending an Connection Dropped Async Message on another 4279 * active connection. 4280 */ 4281 if (atomic_read(&conn->connection_recovery)) 4282 iscsit_build_conn_drop_async_message(conn); 4283 4284 spin_unlock_bh(&sess->conn_lock); 4285 4286 /* 4287 * If connection reinstatement is being performed on this connection, 4288 * up the connection reinstatement semaphore that is being blocked on 4289 * in iscsit_cause_connection_reinstatement(). 4290 */ 4291 spin_lock_bh(&conn->state_lock); 4292 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4293 spin_unlock_bh(&conn->state_lock); 4294 complete(&conn->conn_wait_comp); 4295 wait_for_completion(&conn->conn_post_wait_comp); 4296 spin_lock_bh(&conn->state_lock); 4297 } 4298 4299 /* 4300 * If connection reinstatement is being performed on this connection 4301 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4302 * connection wait rcfr semaphore that is being blocked on 4303 * an iscsit_connection_reinstatement_rcfr(). 4304 */ 4305 if (atomic_read(&conn->connection_wait_rcfr)) { 4306 spin_unlock_bh(&conn->state_lock); 4307 complete(&conn->conn_wait_rcfr_comp); 4308 wait_for_completion(&conn->conn_post_wait_comp); 4309 spin_lock_bh(&conn->state_lock); 4310 } 4311 atomic_set(&conn->connection_reinstatement, 1); 4312 spin_unlock_bh(&conn->state_lock); 4313 4314 /* 4315 * If any other processes are accessing this connection pointer we 4316 * must wait until they have completed. 4317 */ 4318 iscsit_check_conn_usage_count(conn); 4319 4320 if (conn->conn_rx_hash.tfm) 4321 crypto_free_hash(conn->conn_rx_hash.tfm); 4322 if (conn->conn_tx_hash.tfm) 4323 crypto_free_hash(conn->conn_tx_hash.tfm); 4324 4325 if (conn->conn_cpumask) 4326 free_cpumask_var(conn->conn_cpumask); 4327 4328 kfree(conn->conn_ops); 4329 conn->conn_ops = NULL; 4330 4331 if (conn->sock) 4332 sock_release(conn->sock); 4333 4334 if (conn->conn_transport->iscsit_free_conn) 4335 conn->conn_transport->iscsit_free_conn(conn); 4336 4337 iscsit_put_transport(conn->conn_transport); 4338 4339 conn->thread_set = NULL; 4340 4341 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4342 conn->conn_state = TARG_CONN_STATE_FREE; 4343 kfree(conn); 4344 4345 spin_lock_bh(&sess->conn_lock); 4346 atomic_dec(&sess->nconn); 4347 pr_debug("Decremented iSCSI connection count to %hu from node:" 4348 " %s\n", atomic_read(&sess->nconn), 4349 sess->sess_ops->InitiatorName); 4350 /* 4351 * Make sure that if one connection fails in an non ERL=2 iSCSI 4352 * Session that they all fail. 4353 */ 4354 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4355 !atomic_read(&sess->session_logout)) 4356 atomic_set(&sess->session_fall_back_to_erl0, 1); 4357 4358 /* 4359 * If this was not the last connection in the session, and we are 4360 * performing session reinstatement or falling back to ERL=0, call 4361 * iscsit_stop_session() without sleeping to shutdown the other 4362 * active connections. 4363 */ 4364 if (atomic_read(&sess->nconn)) { 4365 if (!atomic_read(&sess->session_reinstatement) && 4366 !atomic_read(&sess->session_fall_back_to_erl0)) { 4367 spin_unlock_bh(&sess->conn_lock); 4368 return 0; 4369 } 4370 if (!atomic_read(&sess->session_stop_active)) { 4371 atomic_set(&sess->session_stop_active, 1); 4372 spin_unlock_bh(&sess->conn_lock); 4373 iscsit_stop_session(sess, 0, 0); 4374 return 0; 4375 } 4376 spin_unlock_bh(&sess->conn_lock); 4377 return 0; 4378 } 4379 4380 /* 4381 * If this was the last connection in the session and one of the 4382 * following is occurring: 4383 * 4384 * Session Reinstatement is not being performed, and are falling back 4385 * to ERL=0 call iscsit_close_session(). 4386 * 4387 * Session Logout was requested. iscsit_close_session() will be called 4388 * elsewhere. 4389 * 4390 * Session Continuation is not being performed, start the Time2Retain 4391 * handler and check if sleep_on_sess_wait_sem is active. 4392 */ 4393 if (!atomic_read(&sess->session_reinstatement) && 4394 atomic_read(&sess->session_fall_back_to_erl0)) { 4395 spin_unlock_bh(&sess->conn_lock); 4396 target_put_session(sess->se_sess); 4397 4398 return 0; 4399 } else if (atomic_read(&sess->session_logout)) { 4400 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4401 sess->session_state = TARG_SESS_STATE_FREE; 4402 spin_unlock_bh(&sess->conn_lock); 4403 4404 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4405 complete(&sess->session_wait_comp); 4406 4407 return 0; 4408 } else { 4409 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4410 sess->session_state = TARG_SESS_STATE_FAILED; 4411 4412 if (!atomic_read(&sess->session_continuation)) { 4413 spin_unlock_bh(&sess->conn_lock); 4414 iscsit_start_time2retain_handler(sess); 4415 } else 4416 spin_unlock_bh(&sess->conn_lock); 4417 4418 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4419 complete(&sess->session_wait_comp); 4420 4421 return 0; 4422 } 4423 spin_unlock_bh(&sess->conn_lock); 4424 4425 return 0; 4426 } 4427 4428 int iscsit_close_session(struct iscsi_session *sess) 4429 { 4430 struct iscsi_portal_group *tpg = sess->tpg; 4431 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4432 4433 if (atomic_read(&sess->nconn)) { 4434 pr_err("%d connection(s) still exist for iSCSI session" 4435 " to %s\n", atomic_read(&sess->nconn), 4436 sess->sess_ops->InitiatorName); 4437 BUG(); 4438 } 4439 4440 spin_lock_bh(&se_tpg->session_lock); 4441 atomic_set(&sess->session_logout, 1); 4442 atomic_set(&sess->session_reinstatement, 1); 4443 iscsit_stop_time2retain_timer(sess); 4444 spin_unlock_bh(&se_tpg->session_lock); 4445 4446 /* 4447 * transport_deregister_session_configfs() will clear the 4448 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4449 * can be setting it again with __transport_register_session() in 4450 * iscsi_post_login_handler() again after the iscsit_stop_session() 4451 * completes in iscsi_np context. 4452 */ 4453 transport_deregister_session_configfs(sess->se_sess); 4454 4455 /* 4456 * If any other processes are accessing this session pointer we must 4457 * wait until they have completed. If we are in an interrupt (the 4458 * time2retain handler) and contain and active session usage count we 4459 * restart the timer and exit. 4460 */ 4461 if (!in_interrupt()) { 4462 if (iscsit_check_session_usage_count(sess) == 1) 4463 iscsit_stop_session(sess, 1, 1); 4464 } else { 4465 if (iscsit_check_session_usage_count(sess) == 2) { 4466 atomic_set(&sess->session_logout, 0); 4467 iscsit_start_time2retain_handler(sess); 4468 return 0; 4469 } 4470 } 4471 4472 transport_deregister_session(sess->se_sess); 4473 4474 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4475 iscsit_free_connection_recovery_entires(sess); 4476 4477 iscsit_free_all_ooo_cmdsns(sess); 4478 4479 spin_lock_bh(&se_tpg->session_lock); 4480 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4481 sess->session_state = TARG_SESS_STATE_FREE; 4482 pr_debug("Released iSCSI session from node: %s\n", 4483 sess->sess_ops->InitiatorName); 4484 tpg->nsessions--; 4485 if (tpg->tpg_tiqn) 4486 tpg->tpg_tiqn->tiqn_nsessions--; 4487 4488 pr_debug("Decremented number of active iSCSI Sessions on" 4489 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4490 4491 spin_lock(&sess_idr_lock); 4492 idr_remove(&sess_idr, sess->session_index); 4493 spin_unlock(&sess_idr_lock); 4494 4495 kfree(sess->sess_ops); 4496 sess->sess_ops = NULL; 4497 spin_unlock_bh(&se_tpg->session_lock); 4498 4499 kfree(sess); 4500 return 0; 4501 } 4502 4503 static void iscsit_logout_post_handler_closesession( 4504 struct iscsi_conn *conn) 4505 { 4506 struct iscsi_session *sess = conn->sess; 4507 4508 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4509 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4510 4511 atomic_set(&conn->conn_logout_remove, 0); 4512 complete(&conn->conn_logout_comp); 4513 4514 iscsit_dec_conn_usage_count(conn); 4515 iscsit_stop_session(sess, 1, 1); 4516 iscsit_dec_session_usage_count(sess); 4517 target_put_session(sess->se_sess); 4518 } 4519 4520 static void iscsit_logout_post_handler_samecid( 4521 struct iscsi_conn *conn) 4522 { 4523 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4524 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4525 4526 atomic_set(&conn->conn_logout_remove, 0); 4527 complete(&conn->conn_logout_comp); 4528 4529 iscsit_cause_connection_reinstatement(conn, 1); 4530 iscsit_dec_conn_usage_count(conn); 4531 } 4532 4533 static void iscsit_logout_post_handler_diffcid( 4534 struct iscsi_conn *conn, 4535 u16 cid) 4536 { 4537 struct iscsi_conn *l_conn; 4538 struct iscsi_session *sess = conn->sess; 4539 4540 if (!sess) 4541 return; 4542 4543 spin_lock_bh(&sess->conn_lock); 4544 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4545 if (l_conn->cid == cid) { 4546 iscsit_inc_conn_usage_count(l_conn); 4547 break; 4548 } 4549 } 4550 spin_unlock_bh(&sess->conn_lock); 4551 4552 if (!l_conn) 4553 return; 4554 4555 if (l_conn->sock) 4556 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4557 4558 spin_lock_bh(&l_conn->state_lock); 4559 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4560 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4561 spin_unlock_bh(&l_conn->state_lock); 4562 4563 iscsit_cause_connection_reinstatement(l_conn, 1); 4564 iscsit_dec_conn_usage_count(l_conn); 4565 } 4566 4567 /* 4568 * Return of 0 causes the TX thread to restart. 4569 */ 4570 int iscsit_logout_post_handler( 4571 struct iscsi_cmd *cmd, 4572 struct iscsi_conn *conn) 4573 { 4574 int ret = 0; 4575 4576 switch (cmd->logout_reason) { 4577 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4578 switch (cmd->logout_response) { 4579 case ISCSI_LOGOUT_SUCCESS: 4580 case ISCSI_LOGOUT_CLEANUP_FAILED: 4581 default: 4582 iscsit_logout_post_handler_closesession(conn); 4583 break; 4584 } 4585 ret = 0; 4586 break; 4587 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4588 if (conn->cid == cmd->logout_cid) { 4589 switch (cmd->logout_response) { 4590 case ISCSI_LOGOUT_SUCCESS: 4591 case ISCSI_LOGOUT_CLEANUP_FAILED: 4592 default: 4593 iscsit_logout_post_handler_samecid(conn); 4594 break; 4595 } 4596 ret = 0; 4597 } else { 4598 switch (cmd->logout_response) { 4599 case ISCSI_LOGOUT_SUCCESS: 4600 iscsit_logout_post_handler_diffcid(conn, 4601 cmd->logout_cid); 4602 break; 4603 case ISCSI_LOGOUT_CID_NOT_FOUND: 4604 case ISCSI_LOGOUT_CLEANUP_FAILED: 4605 default: 4606 break; 4607 } 4608 ret = 1; 4609 } 4610 break; 4611 case ISCSI_LOGOUT_REASON_RECOVERY: 4612 switch (cmd->logout_response) { 4613 case ISCSI_LOGOUT_SUCCESS: 4614 case ISCSI_LOGOUT_CID_NOT_FOUND: 4615 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4616 case ISCSI_LOGOUT_CLEANUP_FAILED: 4617 default: 4618 break; 4619 } 4620 ret = 1; 4621 break; 4622 default: 4623 break; 4624 4625 } 4626 return ret; 4627 } 4628 EXPORT_SYMBOL(iscsit_logout_post_handler); 4629 4630 void iscsit_fail_session(struct iscsi_session *sess) 4631 { 4632 struct iscsi_conn *conn; 4633 4634 spin_lock_bh(&sess->conn_lock); 4635 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4636 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4637 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4638 } 4639 spin_unlock_bh(&sess->conn_lock); 4640 4641 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4642 sess->session_state = TARG_SESS_STATE_FAILED; 4643 } 4644 4645 int iscsit_free_session(struct iscsi_session *sess) 4646 { 4647 u16 conn_count = atomic_read(&sess->nconn); 4648 struct iscsi_conn *conn, *conn_tmp = NULL; 4649 int is_last; 4650 4651 spin_lock_bh(&sess->conn_lock); 4652 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4653 4654 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4655 conn_list) { 4656 if (conn_count == 0) 4657 break; 4658 4659 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4660 is_last = 1; 4661 } else { 4662 iscsit_inc_conn_usage_count(conn_tmp); 4663 is_last = 0; 4664 } 4665 iscsit_inc_conn_usage_count(conn); 4666 4667 spin_unlock_bh(&sess->conn_lock); 4668 iscsit_cause_connection_reinstatement(conn, 1); 4669 spin_lock_bh(&sess->conn_lock); 4670 4671 iscsit_dec_conn_usage_count(conn); 4672 if (is_last == 0) 4673 iscsit_dec_conn_usage_count(conn_tmp); 4674 4675 conn_count--; 4676 } 4677 4678 if (atomic_read(&sess->nconn)) { 4679 spin_unlock_bh(&sess->conn_lock); 4680 wait_for_completion(&sess->session_wait_comp); 4681 } else 4682 spin_unlock_bh(&sess->conn_lock); 4683 4684 target_put_session(sess->se_sess); 4685 return 0; 4686 } 4687 4688 void iscsit_stop_session( 4689 struct iscsi_session *sess, 4690 int session_sleep, 4691 int connection_sleep) 4692 { 4693 u16 conn_count = atomic_read(&sess->nconn); 4694 struct iscsi_conn *conn, *conn_tmp = NULL; 4695 int is_last; 4696 4697 spin_lock_bh(&sess->conn_lock); 4698 if (session_sleep) 4699 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4700 4701 if (connection_sleep) { 4702 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4703 conn_list) { 4704 if (conn_count == 0) 4705 break; 4706 4707 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4708 is_last = 1; 4709 } else { 4710 iscsit_inc_conn_usage_count(conn_tmp); 4711 is_last = 0; 4712 } 4713 iscsit_inc_conn_usage_count(conn); 4714 4715 spin_unlock_bh(&sess->conn_lock); 4716 iscsit_cause_connection_reinstatement(conn, 1); 4717 spin_lock_bh(&sess->conn_lock); 4718 4719 iscsit_dec_conn_usage_count(conn); 4720 if (is_last == 0) 4721 iscsit_dec_conn_usage_count(conn_tmp); 4722 conn_count--; 4723 } 4724 } else { 4725 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4726 iscsit_cause_connection_reinstatement(conn, 0); 4727 } 4728 4729 if (session_sleep && atomic_read(&sess->nconn)) { 4730 spin_unlock_bh(&sess->conn_lock); 4731 wait_for_completion(&sess->session_wait_comp); 4732 } else 4733 spin_unlock_bh(&sess->conn_lock); 4734 } 4735 4736 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4737 { 4738 struct iscsi_session *sess; 4739 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4740 struct se_session *se_sess, *se_sess_tmp; 4741 int session_count = 0; 4742 4743 spin_lock_bh(&se_tpg->session_lock); 4744 if (tpg->nsessions && !force) { 4745 spin_unlock_bh(&se_tpg->session_lock); 4746 return -1; 4747 } 4748 4749 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4750 sess_list) { 4751 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4752 4753 spin_lock(&sess->conn_lock); 4754 if (atomic_read(&sess->session_fall_back_to_erl0) || 4755 atomic_read(&sess->session_logout) || 4756 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4757 spin_unlock(&sess->conn_lock); 4758 continue; 4759 } 4760 atomic_set(&sess->session_reinstatement, 1); 4761 spin_unlock(&sess->conn_lock); 4762 spin_unlock_bh(&se_tpg->session_lock); 4763 4764 iscsit_free_session(sess); 4765 spin_lock_bh(&se_tpg->session_lock); 4766 4767 session_count++; 4768 } 4769 spin_unlock_bh(&se_tpg->session_lock); 4770 4771 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4772 " Group: %hu\n", session_count, tpg->tpgt); 4773 return 0; 4774 } 4775 4776 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4777 MODULE_VERSION("4.1.x"); 4778 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4779 MODULE_LICENSE("GPL"); 4780 4781 module_init(iscsi_target_init_module); 4782 module_exit(iscsi_target_cleanup_module); 4783