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 && (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) { 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 np->enabled = true; 464 spin_unlock_bh(&np->np_thread_lock); 465 return 0; 466 } 467 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 468 spin_unlock_bh(&np->np_thread_lock); 469 470 if (np->np_thread) { 471 /* 472 * We need to send the signal to wakeup Linux/Net 473 * which may be sleeping in sock_accept().. 474 */ 475 send_sig(SIGINT, np->np_thread, 1); 476 kthread_stop(np->np_thread); 477 np->np_thread = NULL; 478 } 479 480 np->np_transport->iscsit_free_np(np); 481 482 mutex_lock(&np_lock); 483 list_del(&np->np_list); 484 mutex_unlock(&np_lock); 485 486 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 487 np->np_ip, np->np_port, np->np_transport->name); 488 489 iscsit_put_transport(np->np_transport); 490 kfree(np); 491 return 0; 492 } 493 494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 496 497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 498 { 499 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 500 return 0; 501 } 502 503 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 504 { 505 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD); 506 507 spin_lock_bh(&conn->cmd_lock); 508 if (!list_empty(&cmd->i_conn_node)) 509 list_del_init(&cmd->i_conn_node); 510 spin_unlock_bh(&conn->cmd_lock); 511 512 __iscsit_free_cmd(cmd, scsi_cmd, true); 513 } 514 515 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 516 { 517 return TARGET_PROT_NORMAL; 518 } 519 520 static struct iscsit_transport iscsi_target_transport = { 521 .name = "iSCSI/TCP", 522 .transport_type = ISCSI_TCP, 523 .owner = NULL, 524 .iscsit_setup_np = iscsit_setup_np, 525 .iscsit_accept_np = iscsit_accept_np, 526 .iscsit_free_np = iscsit_free_np, 527 .iscsit_get_login_rx = iscsit_get_login_rx, 528 .iscsit_put_login_tx = iscsit_put_login_tx, 529 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 530 .iscsit_immediate_queue = iscsit_immediate_queue, 531 .iscsit_response_queue = iscsit_response_queue, 532 .iscsit_queue_data_in = iscsit_queue_rsp, 533 .iscsit_queue_status = iscsit_queue_rsp, 534 .iscsit_aborted_task = iscsit_aborted_task, 535 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 536 }; 537 538 static int __init iscsi_target_init_module(void) 539 { 540 int ret = 0; 541 542 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 543 544 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 545 if (!iscsit_global) { 546 pr_err("Unable to allocate memory for iscsit_global\n"); 547 return -1; 548 } 549 mutex_init(&auth_id_lock); 550 spin_lock_init(&sess_idr_lock); 551 idr_init(&tiqn_idr); 552 idr_init(&sess_idr); 553 554 ret = iscsi_target_register_configfs(); 555 if (ret < 0) 556 goto out; 557 558 ret = iscsi_thread_set_init(); 559 if (ret < 0) 560 goto configfs_out; 561 562 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 563 TARGET_THREAD_SET_COUNT) { 564 pr_err("iscsi_allocate_thread_sets() returned" 565 " unexpected value!\n"); 566 goto ts_out1; 567 } 568 569 lio_qr_cache = kmem_cache_create("lio_qr_cache", 570 sizeof(struct iscsi_queue_req), 571 __alignof__(struct iscsi_queue_req), 0, NULL); 572 if (!lio_qr_cache) { 573 pr_err("nable to kmem_cache_create() for" 574 " lio_qr_cache\n"); 575 goto ts_out2; 576 } 577 578 lio_dr_cache = kmem_cache_create("lio_dr_cache", 579 sizeof(struct iscsi_datain_req), 580 __alignof__(struct iscsi_datain_req), 0, NULL); 581 if (!lio_dr_cache) { 582 pr_err("Unable to kmem_cache_create() for" 583 " lio_dr_cache\n"); 584 goto qr_out; 585 } 586 587 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 588 sizeof(struct iscsi_ooo_cmdsn), 589 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 590 if (!lio_ooo_cache) { 591 pr_err("Unable to kmem_cache_create() for" 592 " lio_ooo_cache\n"); 593 goto dr_out; 594 } 595 596 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 597 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 598 0, NULL); 599 if (!lio_r2t_cache) { 600 pr_err("Unable to kmem_cache_create() for" 601 " lio_r2t_cache\n"); 602 goto ooo_out; 603 } 604 605 iscsit_register_transport(&iscsi_target_transport); 606 607 if (iscsit_load_discovery_tpg() < 0) 608 goto r2t_out; 609 610 return ret; 611 r2t_out: 612 kmem_cache_destroy(lio_r2t_cache); 613 ooo_out: 614 kmem_cache_destroy(lio_ooo_cache); 615 dr_out: 616 kmem_cache_destroy(lio_dr_cache); 617 qr_out: 618 kmem_cache_destroy(lio_qr_cache); 619 ts_out2: 620 iscsi_deallocate_thread_sets(); 621 ts_out1: 622 iscsi_thread_set_free(); 623 configfs_out: 624 iscsi_target_deregister_configfs(); 625 out: 626 kfree(iscsit_global); 627 return -ENOMEM; 628 } 629 630 static void __exit iscsi_target_cleanup_module(void) 631 { 632 iscsi_deallocate_thread_sets(); 633 iscsi_thread_set_free(); 634 iscsit_release_discovery_tpg(); 635 iscsit_unregister_transport(&iscsi_target_transport); 636 kmem_cache_destroy(lio_qr_cache); 637 kmem_cache_destroy(lio_dr_cache); 638 kmem_cache_destroy(lio_ooo_cache); 639 kmem_cache_destroy(lio_r2t_cache); 640 641 iscsi_target_deregister_configfs(); 642 643 kfree(iscsit_global); 644 } 645 646 static int iscsit_add_reject( 647 struct iscsi_conn *conn, 648 u8 reason, 649 unsigned char *buf) 650 { 651 struct iscsi_cmd *cmd; 652 653 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 654 if (!cmd) 655 return -1; 656 657 cmd->iscsi_opcode = ISCSI_OP_REJECT; 658 cmd->reject_reason = reason; 659 660 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 661 if (!cmd->buf_ptr) { 662 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 663 iscsit_free_cmd(cmd, false); 664 return -1; 665 } 666 667 spin_lock_bh(&conn->cmd_lock); 668 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 669 spin_unlock_bh(&conn->cmd_lock); 670 671 cmd->i_state = ISTATE_SEND_REJECT; 672 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 673 674 return -1; 675 } 676 677 static int iscsit_add_reject_from_cmd( 678 struct iscsi_cmd *cmd, 679 u8 reason, 680 bool add_to_conn, 681 unsigned char *buf) 682 { 683 struct iscsi_conn *conn; 684 685 if (!cmd->conn) { 686 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 687 cmd->init_task_tag); 688 return -1; 689 } 690 conn = cmd->conn; 691 692 cmd->iscsi_opcode = ISCSI_OP_REJECT; 693 cmd->reject_reason = reason; 694 695 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 696 if (!cmd->buf_ptr) { 697 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 698 iscsit_free_cmd(cmd, false); 699 return -1; 700 } 701 702 if (add_to_conn) { 703 spin_lock_bh(&conn->cmd_lock); 704 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 705 spin_unlock_bh(&conn->cmd_lock); 706 } 707 708 cmd->i_state = ISTATE_SEND_REJECT; 709 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 710 /* 711 * Perform the kref_put now if se_cmd has already been setup by 712 * scsit_setup_scsi_cmd() 713 */ 714 if (cmd->se_cmd.se_tfo != NULL) { 715 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 716 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 717 } 718 return -1; 719 } 720 721 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 722 unsigned char *buf) 723 { 724 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 725 } 726 727 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 728 { 729 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 730 } 731 732 /* 733 * Map some portion of the allocated scatterlist to an iovec, suitable for 734 * kernel sockets to copy data in/out. 735 */ 736 static int iscsit_map_iovec( 737 struct iscsi_cmd *cmd, 738 struct kvec *iov, 739 u32 data_offset, 740 u32 data_length) 741 { 742 u32 i = 0; 743 struct scatterlist *sg; 744 unsigned int page_off; 745 746 /* 747 * We know each entry in t_data_sg contains a page. 748 */ 749 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 750 page_off = (data_offset % PAGE_SIZE); 751 752 cmd->first_data_sg = sg; 753 cmd->first_data_sg_off = page_off; 754 755 while (data_length) { 756 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 757 758 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 759 iov[i].iov_len = cur_len; 760 761 data_length -= cur_len; 762 page_off = 0; 763 sg = sg_next(sg); 764 i++; 765 } 766 767 cmd->kmapped_nents = i; 768 769 return i; 770 } 771 772 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 773 { 774 u32 i; 775 struct scatterlist *sg; 776 777 sg = cmd->first_data_sg; 778 779 for (i = 0; i < cmd->kmapped_nents; i++) 780 kunmap(sg_page(&sg[i])); 781 } 782 783 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 784 { 785 LIST_HEAD(ack_list); 786 struct iscsi_cmd *cmd, *cmd_p; 787 788 conn->exp_statsn = exp_statsn; 789 790 if (conn->sess->sess_ops->RDMAExtensions) 791 return; 792 793 spin_lock_bh(&conn->cmd_lock); 794 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 795 spin_lock(&cmd->istate_lock); 796 if ((cmd->i_state == ISTATE_SENT_STATUS) && 797 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 798 cmd->i_state = ISTATE_REMOVE; 799 spin_unlock(&cmd->istate_lock); 800 list_move_tail(&cmd->i_conn_node, &ack_list); 801 continue; 802 } 803 spin_unlock(&cmd->istate_lock); 804 } 805 spin_unlock_bh(&conn->cmd_lock); 806 807 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 808 list_del_init(&cmd->i_conn_node); 809 iscsit_free_cmd(cmd, false); 810 } 811 } 812 813 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 814 { 815 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 816 817 iov_count += ISCSI_IOV_DATA_BUFFER; 818 819 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 820 if (!cmd->iov_data) { 821 pr_err("Unable to allocate cmd->iov_data\n"); 822 return -ENOMEM; 823 } 824 825 cmd->orig_iov_data_count = iov_count; 826 return 0; 827 } 828 829 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 830 unsigned char *buf) 831 { 832 int data_direction, payload_length; 833 struct iscsi_scsi_req *hdr; 834 int iscsi_task_attr; 835 int sam_task_attr; 836 837 atomic_long_inc(&conn->sess->cmd_pdus); 838 839 hdr = (struct iscsi_scsi_req *) buf; 840 payload_length = ntoh24(hdr->dlength); 841 842 /* FIXME; Add checks for AdditionalHeaderSegment */ 843 844 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 845 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 846 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 847 " not set. Bad iSCSI Initiator.\n"); 848 return iscsit_add_reject_cmd(cmd, 849 ISCSI_REASON_BOOKMARK_INVALID, buf); 850 } 851 852 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 853 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 854 /* 855 * From RFC-3720 Section 10.3.1: 856 * 857 * "Either or both of R and W MAY be 1 when either the 858 * Expected Data Transfer Length and/or Bidirectional Read 859 * Expected Data Transfer Length are 0" 860 * 861 * For this case, go ahead and clear the unnecssary bits 862 * to avoid any confusion with ->data_direction. 863 */ 864 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 865 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 866 867 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 868 " set when Expected Data Transfer Length is 0 for" 869 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 870 } 871 872 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 873 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 874 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 875 " MUST be set if Expected Data Transfer Length is not 0." 876 " Bad iSCSI Initiator\n"); 877 return iscsit_add_reject_cmd(cmd, 878 ISCSI_REASON_BOOKMARK_INVALID, buf); 879 } 880 881 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 882 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 883 pr_err("Bidirectional operations not supported!\n"); 884 return iscsit_add_reject_cmd(cmd, 885 ISCSI_REASON_BOOKMARK_INVALID, buf); 886 } 887 888 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 889 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 890 " Scsi Command PDU.\n"); 891 return iscsit_add_reject_cmd(cmd, 892 ISCSI_REASON_BOOKMARK_INVALID, buf); 893 } 894 895 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 896 pr_err("ImmediateData=No but DataSegmentLength=%u," 897 " protocol error.\n", payload_length); 898 return iscsit_add_reject_cmd(cmd, 899 ISCSI_REASON_PROTOCOL_ERROR, buf); 900 } 901 902 if ((be32_to_cpu(hdr->data_length) == payload_length) && 903 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 904 pr_err("Expected Data Transfer Length and Length of" 905 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 906 " bit is not set protocol error\n"); 907 return iscsit_add_reject_cmd(cmd, 908 ISCSI_REASON_PROTOCOL_ERROR, buf); 909 } 910 911 if (payload_length > be32_to_cpu(hdr->data_length)) { 912 pr_err("DataSegmentLength: %u is greater than" 913 " EDTL: %u, protocol error.\n", payload_length, 914 hdr->data_length); 915 return iscsit_add_reject_cmd(cmd, 916 ISCSI_REASON_PROTOCOL_ERROR, buf); 917 } 918 919 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 920 pr_err("DataSegmentLength: %u is greater than" 921 " MaxXmitDataSegmentLength: %u, protocol error.\n", 922 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 923 return iscsit_add_reject_cmd(cmd, 924 ISCSI_REASON_PROTOCOL_ERROR, buf); 925 } 926 927 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 928 pr_err("DataSegmentLength: %u is greater than" 929 " FirstBurstLength: %u, protocol error.\n", 930 payload_length, conn->sess->sess_ops->FirstBurstLength); 931 return iscsit_add_reject_cmd(cmd, 932 ISCSI_REASON_BOOKMARK_INVALID, buf); 933 } 934 935 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 936 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 937 DMA_NONE; 938 939 cmd->data_direction = data_direction; 940 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 941 /* 942 * Figure out the SAM Task Attribute for the incoming SCSI CDB 943 */ 944 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 945 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 946 sam_task_attr = MSG_SIMPLE_TAG; 947 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 948 sam_task_attr = MSG_ORDERED_TAG; 949 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 950 sam_task_attr = MSG_HEAD_TAG; 951 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 952 sam_task_attr = MSG_ACA_TAG; 953 else { 954 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 955 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 956 sam_task_attr = MSG_SIMPLE_TAG; 957 } 958 959 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 960 cmd->i_state = ISTATE_NEW_CMD; 961 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 962 cmd->immediate_data = (payload_length) ? 1 : 0; 963 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 964 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 965 if (cmd->unsolicited_data) 966 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 967 968 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 969 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 970 spin_lock_bh(&conn->sess->ttt_lock); 971 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 972 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 973 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 974 spin_unlock_bh(&conn->sess->ttt_lock); 975 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 976 cmd->targ_xfer_tag = 0xFFFFFFFF; 977 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 978 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 979 cmd->first_burst_len = payload_length; 980 981 if (!conn->sess->sess_ops->RDMAExtensions && 982 cmd->data_direction == DMA_FROM_DEVICE) { 983 struct iscsi_datain_req *dr; 984 985 dr = iscsit_allocate_datain_req(); 986 if (!dr) 987 return iscsit_add_reject_cmd(cmd, 988 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 989 990 iscsit_attach_datain_req(cmd, dr); 991 } 992 993 /* 994 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 995 */ 996 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 997 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 998 cmd->data_direction, sam_task_attr, 999 cmd->sense_buffer + 2); 1000 1001 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1002 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1003 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1004 conn->cid); 1005 1006 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1007 1008 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1009 scsilun_to_int(&hdr->lun)); 1010 if (cmd->sense_reason) 1011 goto attach_cmd; 1012 1013 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1014 if (cmd->sense_reason) { 1015 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1016 return iscsit_add_reject_cmd(cmd, 1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1018 } 1019 1020 goto attach_cmd; 1021 } 1022 1023 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1024 return iscsit_add_reject_cmd(cmd, 1025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1026 } 1027 1028 attach_cmd: 1029 spin_lock_bh(&conn->cmd_lock); 1030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1031 spin_unlock_bh(&conn->cmd_lock); 1032 /* 1033 * Check if we need to delay processing because of ALUA 1034 * Active/NonOptimized primary access state.. 1035 */ 1036 core_alua_check_nonop_delay(&cmd->se_cmd); 1037 1038 return 0; 1039 } 1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1041 1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1043 { 1044 iscsit_set_dataout_sequence_values(cmd); 1045 1046 spin_lock_bh(&cmd->dataout_timeout_lock); 1047 iscsit_start_dataout_timer(cmd, cmd->conn); 1048 spin_unlock_bh(&cmd->dataout_timeout_lock); 1049 } 1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1051 1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1053 struct iscsi_scsi_req *hdr) 1054 { 1055 int cmdsn_ret = 0; 1056 /* 1057 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1058 * the Immediate Bit is not set, and no Immediate 1059 * Data is attached. 1060 * 1061 * A PDU/CmdSN carrying Immediate Data can only 1062 * be processed after the DataCRC has passed. 1063 * If the DataCRC fails, the CmdSN MUST NOT 1064 * be acknowledged. (See below) 1065 */ 1066 if (!cmd->immediate_data) { 1067 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1068 (unsigned char *)hdr, hdr->cmdsn); 1069 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1070 return -1; 1071 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1072 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1073 return 0; 1074 } 1075 } 1076 1077 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1078 1079 /* 1080 * If no Immediate Data is attached, it's OK to return now. 1081 */ 1082 if (!cmd->immediate_data) { 1083 if (!cmd->sense_reason && cmd->unsolicited_data) 1084 iscsit_set_unsoliticed_dataout(cmd); 1085 if (!cmd->sense_reason) 1086 return 0; 1087 1088 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1089 return 0; 1090 } 1091 1092 /* 1093 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1094 * execution. These exceptions are processed in CmdSN order using 1095 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1096 */ 1097 if (cmd->sense_reason) { 1098 if (cmd->reject_reason) 1099 return 0; 1100 1101 return 1; 1102 } 1103 /* 1104 * Call directly into transport_generic_new_cmd() to perform 1105 * the backend memory allocation. 1106 */ 1107 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1108 if (cmd->sense_reason) 1109 return 1; 1110 1111 return 0; 1112 } 1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1114 1115 static int 1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1117 bool dump_payload) 1118 { 1119 struct iscsi_conn *conn = cmd->conn; 1120 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1121 /* 1122 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1123 */ 1124 if (dump_payload) 1125 goto after_immediate_data; 1126 1127 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1128 cmd->first_burst_len); 1129 after_immediate_data: 1130 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1131 /* 1132 * A PDU/CmdSN carrying Immediate Data passed 1133 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1134 * Immediate Bit is not set. 1135 */ 1136 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1137 (unsigned char *)hdr, hdr->cmdsn); 1138 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1139 return -1; 1140 1141 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1142 int rc; 1143 1144 rc = iscsit_dump_data_payload(cmd->conn, 1145 cmd->first_burst_len, 1); 1146 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1147 return rc; 1148 } else if (cmd->unsolicited_data) 1149 iscsit_set_unsoliticed_dataout(cmd); 1150 1151 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1152 /* 1153 * Immediate Data failed DataCRC and ERL>=1, 1154 * silently drop this PDU and let the initiator 1155 * plug the CmdSN gap. 1156 * 1157 * FIXME: Send Unsolicited NOPIN with reserved 1158 * TTT here to help the initiator figure out 1159 * the missing CmdSN, although they should be 1160 * intelligent enough to determine the missing 1161 * CmdSN and issue a retry to plug the sequence. 1162 */ 1163 cmd->i_state = ISTATE_REMOVE; 1164 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1165 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1166 return -1; 1167 1168 return 0; 1169 } 1170 1171 static int 1172 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1173 unsigned char *buf) 1174 { 1175 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1176 int rc, immed_data; 1177 bool dump_payload = false; 1178 1179 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1180 if (rc < 0) 1181 return 0; 1182 /* 1183 * Allocation iovecs needed for struct socket operations for 1184 * traditional iSCSI block I/O. 1185 */ 1186 if (iscsit_allocate_iovecs(cmd) < 0) { 1187 return iscsit_add_reject_cmd(cmd, 1188 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1189 } 1190 immed_data = cmd->immediate_data; 1191 1192 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1193 if (rc < 0) 1194 return rc; 1195 else if (rc > 0) 1196 dump_payload = true; 1197 1198 if (!immed_data) 1199 return 0; 1200 1201 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1202 } 1203 1204 static u32 iscsit_do_crypto_hash_sg( 1205 struct hash_desc *hash, 1206 struct iscsi_cmd *cmd, 1207 u32 data_offset, 1208 u32 data_length, 1209 u32 padding, 1210 u8 *pad_bytes) 1211 { 1212 u32 data_crc; 1213 u32 i; 1214 struct scatterlist *sg; 1215 unsigned int page_off; 1216 1217 crypto_hash_init(hash); 1218 1219 sg = cmd->first_data_sg; 1220 page_off = cmd->first_data_sg_off; 1221 1222 i = 0; 1223 while (data_length) { 1224 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1225 1226 crypto_hash_update(hash, &sg[i], cur_len); 1227 1228 data_length -= cur_len; 1229 page_off = 0; 1230 i++; 1231 } 1232 1233 if (padding) { 1234 struct scatterlist pad_sg; 1235 1236 sg_init_one(&pad_sg, pad_bytes, padding); 1237 crypto_hash_update(hash, &pad_sg, padding); 1238 } 1239 crypto_hash_final(hash, (u8 *) &data_crc); 1240 1241 return data_crc; 1242 } 1243 1244 static void iscsit_do_crypto_hash_buf( 1245 struct hash_desc *hash, 1246 const void *buf, 1247 u32 payload_length, 1248 u32 padding, 1249 u8 *pad_bytes, 1250 u8 *data_crc) 1251 { 1252 struct scatterlist sg; 1253 1254 crypto_hash_init(hash); 1255 1256 sg_init_one(&sg, buf, payload_length); 1257 crypto_hash_update(hash, &sg, payload_length); 1258 1259 if (padding) { 1260 sg_init_one(&sg, pad_bytes, padding); 1261 crypto_hash_update(hash, &sg, padding); 1262 } 1263 crypto_hash_final(hash, data_crc); 1264 } 1265 1266 int 1267 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1268 struct iscsi_cmd **out_cmd) 1269 { 1270 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1271 struct iscsi_cmd *cmd = NULL; 1272 struct se_cmd *se_cmd; 1273 u32 payload_length = ntoh24(hdr->dlength); 1274 int rc; 1275 1276 if (!payload_length) { 1277 pr_warn("DataOUT payload is ZERO, ignoring.\n"); 1278 return 0; 1279 } 1280 1281 /* iSCSI write */ 1282 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1283 1284 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1285 pr_err("DataSegmentLength: %u is greater than" 1286 " MaxXmitDataSegmentLength: %u\n", payload_length, 1287 conn->conn_ops->MaxXmitDataSegmentLength); 1288 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1289 buf); 1290 } 1291 1292 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1293 payload_length); 1294 if (!cmd) 1295 return 0; 1296 1297 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1298 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1299 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1300 payload_length, conn->cid); 1301 1302 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1303 pr_err("Command ITT: 0x%08x received DataOUT after" 1304 " last DataOUT received, dumping payload\n", 1305 cmd->init_task_tag); 1306 return iscsit_dump_data_payload(conn, payload_length, 1); 1307 } 1308 1309 if (cmd->data_direction != DMA_TO_DEVICE) { 1310 pr_err("Command ITT: 0x%08x received DataOUT for a" 1311 " NON-WRITE command.\n", cmd->init_task_tag); 1312 return iscsit_dump_data_payload(conn, payload_length, 1); 1313 } 1314 se_cmd = &cmd->se_cmd; 1315 iscsit_mod_dataout_timer(cmd); 1316 1317 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1318 pr_err("DataOut Offset: %u, Length %u greater than" 1319 " iSCSI Command EDTL %u, protocol error.\n", 1320 hdr->offset, payload_length, cmd->se_cmd.data_length); 1321 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1322 } 1323 1324 if (cmd->unsolicited_data) { 1325 int dump_unsolicited_data = 0; 1326 1327 if (conn->sess->sess_ops->InitialR2T) { 1328 pr_err("Received unexpected unsolicited data" 1329 " while InitialR2T=Yes, protocol error.\n"); 1330 transport_send_check_condition_and_sense(&cmd->se_cmd, 1331 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1332 return -1; 1333 } 1334 /* 1335 * Special case for dealing with Unsolicited DataOUT 1336 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1337 * failures; 1338 */ 1339 1340 /* Something's amiss if we're not in WRITE_PENDING state... */ 1341 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1342 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1343 dump_unsolicited_data = 1; 1344 1345 if (dump_unsolicited_data) { 1346 /* 1347 * Check if a delayed TASK_ABORTED status needs to 1348 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1349 * received with the unsolicitied data out. 1350 */ 1351 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1352 iscsit_stop_dataout_timer(cmd); 1353 1354 transport_check_aborted_status(se_cmd, 1355 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1356 return iscsit_dump_data_payload(conn, payload_length, 1); 1357 } 1358 } else { 1359 /* 1360 * For the normal solicited data path: 1361 * 1362 * Check for a delayed TASK_ABORTED status and dump any 1363 * incoming data out payload if one exists. Also, when the 1364 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1365 * data out sequence, we decrement outstanding_r2ts. Once 1366 * outstanding_r2ts reaches zero, go ahead and send the delayed 1367 * TASK_ABORTED status. 1368 */ 1369 if (se_cmd->transport_state & CMD_T_ABORTED) { 1370 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1371 if (--cmd->outstanding_r2ts < 1) { 1372 iscsit_stop_dataout_timer(cmd); 1373 transport_check_aborted_status( 1374 se_cmd, 1); 1375 } 1376 1377 return iscsit_dump_data_payload(conn, payload_length, 1); 1378 } 1379 } 1380 /* 1381 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1382 * within-command recovery checks before receiving the payload. 1383 */ 1384 rc = iscsit_check_pre_dataout(cmd, buf); 1385 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1386 return 0; 1387 else if (rc == DATAOUT_CANNOT_RECOVER) 1388 return -1; 1389 1390 *out_cmd = cmd; 1391 return 0; 1392 } 1393 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1394 1395 static int 1396 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1397 struct iscsi_data *hdr) 1398 { 1399 struct kvec *iov; 1400 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1401 u32 payload_length = ntoh24(hdr->dlength); 1402 int iov_ret, data_crc_failed = 0; 1403 1404 rx_size += payload_length; 1405 iov = &cmd->iov_data[0]; 1406 1407 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1408 payload_length); 1409 if (iov_ret < 0) 1410 return -1; 1411 1412 iov_count += iov_ret; 1413 1414 padding = ((-payload_length) & 3); 1415 if (padding != 0) { 1416 iov[iov_count].iov_base = cmd->pad_bytes; 1417 iov[iov_count++].iov_len = padding; 1418 rx_size += padding; 1419 pr_debug("Receiving %u padding bytes.\n", padding); 1420 } 1421 1422 if (conn->conn_ops->DataDigest) { 1423 iov[iov_count].iov_base = &checksum; 1424 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1425 rx_size += ISCSI_CRC_LEN; 1426 } 1427 1428 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1429 1430 iscsit_unmap_iovec(cmd); 1431 1432 if (rx_got != rx_size) 1433 return -1; 1434 1435 if (conn->conn_ops->DataDigest) { 1436 u32 data_crc; 1437 1438 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1439 be32_to_cpu(hdr->offset), 1440 payload_length, padding, 1441 cmd->pad_bytes); 1442 1443 if (checksum != data_crc) { 1444 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1445 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1446 " does not match computed 0x%08x\n", 1447 hdr->itt, hdr->offset, payload_length, 1448 hdr->datasn, checksum, data_crc); 1449 data_crc_failed = 1; 1450 } else { 1451 pr_debug("Got CRC32C DataDigest 0x%08x for" 1452 " %u bytes of Data Out\n", checksum, 1453 payload_length); 1454 } 1455 } 1456 1457 return data_crc_failed; 1458 } 1459 1460 int 1461 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1462 bool data_crc_failed) 1463 { 1464 struct iscsi_conn *conn = cmd->conn; 1465 int rc, ooo_cmdsn; 1466 /* 1467 * Increment post receive data and CRC values or perform 1468 * within-command recovery. 1469 */ 1470 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1471 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1472 return 0; 1473 else if (rc == DATAOUT_SEND_R2T) { 1474 iscsit_set_dataout_sequence_values(cmd); 1475 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1476 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1477 /* 1478 * Handle extra special case for out of order 1479 * Unsolicited Data Out. 1480 */ 1481 spin_lock_bh(&cmd->istate_lock); 1482 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1483 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1484 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1485 spin_unlock_bh(&cmd->istate_lock); 1486 1487 iscsit_stop_dataout_timer(cmd); 1488 if (ooo_cmdsn) 1489 return 0; 1490 target_execute_cmd(&cmd->se_cmd); 1491 return 0; 1492 } else /* DATAOUT_CANNOT_RECOVER */ 1493 return -1; 1494 1495 return 0; 1496 } 1497 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1498 1499 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1500 { 1501 struct iscsi_cmd *cmd = NULL; 1502 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1503 int rc; 1504 bool data_crc_failed = false; 1505 1506 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1507 if (rc < 0) 1508 return 0; 1509 else if (!cmd) 1510 return 0; 1511 1512 rc = iscsit_get_dataout(conn, cmd, hdr); 1513 if (rc < 0) 1514 return rc; 1515 else if (rc > 0) 1516 data_crc_failed = true; 1517 1518 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1519 } 1520 1521 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1522 struct iscsi_nopout *hdr) 1523 { 1524 u32 payload_length = ntoh24(hdr->dlength); 1525 1526 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1527 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1528 if (!cmd) 1529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1530 (unsigned char *)hdr); 1531 1532 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1533 (unsigned char *)hdr); 1534 } 1535 1536 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1537 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1538 " not set, protocol error.\n"); 1539 if (!cmd) 1540 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1541 (unsigned char *)hdr); 1542 1543 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1544 (unsigned char *)hdr); 1545 } 1546 1547 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1548 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1549 " greater than MaxXmitDataSegmentLength: %u, protocol" 1550 " error.\n", payload_length, 1551 conn->conn_ops->MaxXmitDataSegmentLength); 1552 if (!cmd) 1553 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1554 (unsigned char *)hdr); 1555 1556 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1557 (unsigned char *)hdr); 1558 } 1559 1560 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1561 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1562 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1563 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1564 payload_length); 1565 /* 1566 * This is not a response to a Unsolicited NopIN, which means 1567 * it can either be a NOPOUT ping request (with a valid ITT), 1568 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1569 * Either way, make sure we allocate an struct iscsi_cmd, as both 1570 * can contain ping data. 1571 */ 1572 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1573 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1574 cmd->i_state = ISTATE_SEND_NOPIN; 1575 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1576 1 : 0); 1577 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1578 cmd->targ_xfer_tag = 0xFFFFFFFF; 1579 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1580 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1581 cmd->data_direction = DMA_NONE; 1582 } 1583 1584 return 0; 1585 } 1586 EXPORT_SYMBOL(iscsit_setup_nop_out); 1587 1588 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1589 struct iscsi_nopout *hdr) 1590 { 1591 struct iscsi_cmd *cmd_p = NULL; 1592 int cmdsn_ret = 0; 1593 /* 1594 * Initiator is expecting a NopIN ping reply.. 1595 */ 1596 if (hdr->itt != RESERVED_ITT) { 1597 if (!cmd) 1598 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1599 (unsigned char *)hdr); 1600 1601 spin_lock_bh(&conn->cmd_lock); 1602 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1603 spin_unlock_bh(&conn->cmd_lock); 1604 1605 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1606 1607 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1608 iscsit_add_cmd_to_response_queue(cmd, conn, 1609 cmd->i_state); 1610 return 0; 1611 } 1612 1613 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1614 (unsigned char *)hdr, hdr->cmdsn); 1615 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1616 return 0; 1617 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1618 return -1; 1619 1620 return 0; 1621 } 1622 /* 1623 * This was a response to a unsolicited NOPIN ping. 1624 */ 1625 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1626 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1627 if (!cmd_p) 1628 return -EINVAL; 1629 1630 iscsit_stop_nopin_response_timer(conn); 1631 1632 cmd_p->i_state = ISTATE_REMOVE; 1633 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1634 1635 iscsit_start_nopin_timer(conn); 1636 return 0; 1637 } 1638 /* 1639 * Otherwise, initiator is not expecting a NOPIN is response. 1640 * Just ignore for now. 1641 */ 1642 return 0; 1643 } 1644 EXPORT_SYMBOL(iscsit_process_nop_out); 1645 1646 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1647 unsigned char *buf) 1648 { 1649 unsigned char *ping_data = NULL; 1650 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1651 struct kvec *iov = NULL; 1652 u32 payload_length = ntoh24(hdr->dlength); 1653 int ret; 1654 1655 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1656 if (ret < 0) 1657 return 0; 1658 /* 1659 * Handle NOP-OUT payload for traditional iSCSI sockets 1660 */ 1661 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1662 u32 checksum, data_crc, padding = 0; 1663 int niov = 0, rx_got, rx_size = payload_length; 1664 1665 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1666 if (!ping_data) { 1667 pr_err("Unable to allocate memory for" 1668 " NOPOUT ping data.\n"); 1669 ret = -1; 1670 goto out; 1671 } 1672 1673 iov = &cmd->iov_misc[0]; 1674 iov[niov].iov_base = ping_data; 1675 iov[niov++].iov_len = payload_length; 1676 1677 padding = ((-payload_length) & 3); 1678 if (padding != 0) { 1679 pr_debug("Receiving %u additional bytes" 1680 " for padding.\n", padding); 1681 iov[niov].iov_base = &cmd->pad_bytes; 1682 iov[niov++].iov_len = padding; 1683 rx_size += padding; 1684 } 1685 if (conn->conn_ops->DataDigest) { 1686 iov[niov].iov_base = &checksum; 1687 iov[niov++].iov_len = ISCSI_CRC_LEN; 1688 rx_size += ISCSI_CRC_LEN; 1689 } 1690 1691 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1692 if (rx_got != rx_size) { 1693 ret = -1; 1694 goto out; 1695 } 1696 1697 if (conn->conn_ops->DataDigest) { 1698 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1699 ping_data, payload_length, 1700 padding, cmd->pad_bytes, 1701 (u8 *)&data_crc); 1702 1703 if (checksum != data_crc) { 1704 pr_err("Ping data CRC32C DataDigest" 1705 " 0x%08x does not match computed 0x%08x\n", 1706 checksum, data_crc); 1707 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1708 pr_err("Unable to recover from" 1709 " NOPOUT Ping DataCRC failure while in" 1710 " ERL=0.\n"); 1711 ret = -1; 1712 goto out; 1713 } else { 1714 /* 1715 * Silently drop this PDU and let the 1716 * initiator plug the CmdSN gap. 1717 */ 1718 pr_debug("Dropping NOPOUT" 1719 " Command CmdSN: 0x%08x due to" 1720 " DataCRC error.\n", hdr->cmdsn); 1721 ret = 0; 1722 goto out; 1723 } 1724 } else { 1725 pr_debug("Got CRC32C DataDigest" 1726 " 0x%08x for %u bytes of ping data.\n", 1727 checksum, payload_length); 1728 } 1729 } 1730 1731 ping_data[payload_length] = '\0'; 1732 /* 1733 * Attach ping data to struct iscsi_cmd->buf_ptr. 1734 */ 1735 cmd->buf_ptr = ping_data; 1736 cmd->buf_ptr_size = payload_length; 1737 1738 pr_debug("Got %u bytes of NOPOUT ping" 1739 " data.\n", payload_length); 1740 pr_debug("Ping Data: \"%s\"\n", ping_data); 1741 } 1742 1743 return iscsit_process_nop_out(conn, cmd, hdr); 1744 out: 1745 if (cmd) 1746 iscsit_free_cmd(cmd, false); 1747 1748 kfree(ping_data); 1749 return ret; 1750 } 1751 1752 int 1753 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1754 unsigned char *buf) 1755 { 1756 struct se_tmr_req *se_tmr; 1757 struct iscsi_tmr_req *tmr_req; 1758 struct iscsi_tm *hdr; 1759 int out_of_order_cmdsn = 0, ret; 1760 bool sess_ref = false; 1761 u8 function; 1762 1763 hdr = (struct iscsi_tm *) buf; 1764 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1765 function = hdr->flags; 1766 1767 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1768 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1769 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1770 hdr->rtt, hdr->refcmdsn, conn->cid); 1771 1772 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1773 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1774 hdr->rtt != RESERVED_ITT)) { 1775 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1776 hdr->rtt = RESERVED_ITT; 1777 } 1778 1779 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1781 pr_err("Task Management Request TASK_REASSIGN not" 1782 " issued as immediate command, bad iSCSI Initiator" 1783 "implementation\n"); 1784 return iscsit_add_reject_cmd(cmd, 1785 ISCSI_REASON_PROTOCOL_ERROR, buf); 1786 } 1787 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1788 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1789 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1790 1791 cmd->data_direction = DMA_NONE; 1792 1793 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1794 if (!cmd->tmr_req) { 1795 pr_err("Unable to allocate memory for" 1796 " Task Management command!\n"); 1797 return iscsit_add_reject_cmd(cmd, 1798 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1799 buf); 1800 } 1801 1802 /* 1803 * TASK_REASSIGN for ERL=2 / connection stays inside of 1804 * LIO-Target $FABRIC_MOD 1805 */ 1806 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1807 1808 u8 tcm_function; 1809 int ret; 1810 1811 transport_init_se_cmd(&cmd->se_cmd, 1812 &lio_target_fabric_configfs->tf_ops, 1813 conn->sess->se_sess, 0, DMA_NONE, 1814 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1815 1816 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1817 sess_ref = true; 1818 1819 switch (function) { 1820 case ISCSI_TM_FUNC_ABORT_TASK: 1821 tcm_function = TMR_ABORT_TASK; 1822 break; 1823 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1824 tcm_function = TMR_ABORT_TASK_SET; 1825 break; 1826 case ISCSI_TM_FUNC_CLEAR_ACA: 1827 tcm_function = TMR_CLEAR_ACA; 1828 break; 1829 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1830 tcm_function = TMR_CLEAR_TASK_SET; 1831 break; 1832 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1833 tcm_function = TMR_LUN_RESET; 1834 break; 1835 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1836 tcm_function = TMR_TARGET_WARM_RESET; 1837 break; 1838 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1839 tcm_function = TMR_TARGET_COLD_RESET; 1840 break; 1841 default: 1842 pr_err("Unknown iSCSI TMR Function:" 1843 " 0x%02x\n", function); 1844 return iscsit_add_reject_cmd(cmd, 1845 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1846 } 1847 1848 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1849 tcm_function, GFP_KERNEL); 1850 if (ret < 0) 1851 return iscsit_add_reject_cmd(cmd, 1852 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1853 1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1855 } 1856 1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1860 cmd->init_task_tag = hdr->itt; 1861 cmd->targ_xfer_tag = 0xFFFFFFFF; 1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1864 se_tmr = cmd->se_cmd.se_tmr_req; 1865 tmr_req = cmd->tmr_req; 1866 /* 1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1868 */ 1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1871 scsilun_to_int(&hdr->lun)); 1872 if (ret < 0) { 1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1874 goto attach; 1875 } 1876 } 1877 1878 switch (function) { 1879 case ISCSI_TM_FUNC_ABORT_TASK: 1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1881 if (se_tmr->response) 1882 goto attach; 1883 break; 1884 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1885 case ISCSI_TM_FUNC_CLEAR_ACA: 1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1888 break; 1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1892 goto attach; 1893 } 1894 break; 1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1898 goto attach; 1899 } 1900 break; 1901 case ISCSI_TM_FUNC_TASK_REASSIGN: 1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1903 /* 1904 * Perform sanity checks on the ExpDataSN only if the 1905 * TASK_REASSIGN was successful. 1906 */ 1907 if (se_tmr->response) 1908 break; 1909 1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1911 return iscsit_add_reject_cmd(cmd, 1912 ISCSI_REASON_BOOKMARK_INVALID, buf); 1913 break; 1914 default: 1915 pr_err("Unknown TMR function: 0x%02x, protocol" 1916 " error.\n", function); 1917 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1918 goto attach; 1919 } 1920 1921 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1922 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1923 se_tmr->call_transport = 1; 1924 attach: 1925 spin_lock_bh(&conn->cmd_lock); 1926 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1927 spin_unlock_bh(&conn->cmd_lock); 1928 1929 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1930 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1931 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1932 out_of_order_cmdsn = 1; 1933 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1934 return 0; 1935 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1936 return -1; 1937 } 1938 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1939 1940 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1941 return 0; 1942 /* 1943 * Found the referenced task, send to transport for processing. 1944 */ 1945 if (se_tmr->call_transport) 1946 return transport_generic_handle_tmr(&cmd->se_cmd); 1947 1948 /* 1949 * Could not find the referenced LUN, task, or Task Management 1950 * command not authorized or supported. Change state and 1951 * let the tx_thread send the response. 1952 * 1953 * For connection recovery, this is also the default action for 1954 * TMR TASK_REASSIGN. 1955 */ 1956 if (sess_ref) { 1957 pr_debug("Handle TMR, using sess_ref=true check\n"); 1958 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1959 } 1960 1961 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1962 return 0; 1963 } 1964 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1965 1966 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1967 int 1968 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1969 struct iscsi_text *hdr) 1970 { 1971 u32 payload_length = ntoh24(hdr->dlength); 1972 1973 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1974 pr_err("Unable to accept text parameter length: %u" 1975 "greater than MaxXmitDataSegmentLength %u.\n", 1976 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1977 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1978 (unsigned char *)hdr); 1979 } 1980 1981 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 1982 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 1983 pr_err("Multi sequence text commands currently not supported\n"); 1984 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 1985 (unsigned char *)hdr); 1986 } 1987 1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1990 hdr->exp_statsn, payload_length); 1991 1992 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1993 cmd->i_state = ISTATE_SEND_TEXTRSP; 1994 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1995 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1996 cmd->targ_xfer_tag = 0xFFFFFFFF; 1997 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1998 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1999 cmd->data_direction = DMA_NONE; 2000 2001 return 0; 2002 } 2003 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2004 2005 int 2006 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2007 struct iscsi_text *hdr) 2008 { 2009 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2010 int cmdsn_ret; 2011 2012 if (!text_in) { 2013 pr_err("Unable to locate text_in buffer for sendtargets" 2014 " discovery\n"); 2015 goto reject; 2016 } 2017 if (strncmp("SendTargets", text_in, 11) != 0) { 2018 pr_err("Received Text Data that is not" 2019 " SendTargets, cannot continue.\n"); 2020 goto reject; 2021 } 2022 text_ptr = strchr(text_in, '='); 2023 if (!text_ptr) { 2024 pr_err("No \"=\" separator found in Text Data," 2025 " cannot continue.\n"); 2026 goto reject; 2027 } 2028 if (!strncmp("=All", text_ptr, 4)) { 2029 cmd->cmd_flags |= IFC_SENDTARGETS_ALL; 2030 } else if (!strncmp("=iqn.", text_ptr, 5) || 2031 !strncmp("=eui.", text_ptr, 5)) { 2032 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE; 2033 } else { 2034 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2035 goto reject; 2036 } 2037 2038 spin_lock_bh(&conn->cmd_lock); 2039 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2040 spin_unlock_bh(&conn->cmd_lock); 2041 2042 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2043 2044 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2045 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2046 (unsigned char *)hdr, hdr->cmdsn); 2047 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2048 return -1; 2049 2050 return 0; 2051 } 2052 2053 return iscsit_execute_cmd(cmd, 0); 2054 2055 reject: 2056 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2057 (unsigned char *)hdr); 2058 } 2059 EXPORT_SYMBOL(iscsit_process_text_cmd); 2060 2061 static int 2062 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2063 unsigned char *buf) 2064 { 2065 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2066 char *text_in = NULL; 2067 u32 payload_length = ntoh24(hdr->dlength); 2068 int rx_size, rc; 2069 2070 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2071 if (rc < 0) 2072 return 0; 2073 2074 rx_size = payload_length; 2075 if (payload_length) { 2076 u32 checksum = 0, data_crc = 0; 2077 u32 padding = 0, pad_bytes = 0; 2078 int niov = 0, rx_got; 2079 struct kvec iov[3]; 2080 2081 text_in = kzalloc(payload_length, GFP_KERNEL); 2082 if (!text_in) { 2083 pr_err("Unable to allocate memory for" 2084 " incoming text parameters\n"); 2085 goto reject; 2086 } 2087 cmd->text_in_ptr = text_in; 2088 2089 memset(iov, 0, 3 * sizeof(struct kvec)); 2090 iov[niov].iov_base = text_in; 2091 iov[niov++].iov_len = payload_length; 2092 2093 padding = ((-payload_length) & 3); 2094 if (padding != 0) { 2095 iov[niov].iov_base = &pad_bytes; 2096 iov[niov++].iov_len = padding; 2097 rx_size += padding; 2098 pr_debug("Receiving %u additional bytes" 2099 " for padding.\n", padding); 2100 } 2101 if (conn->conn_ops->DataDigest) { 2102 iov[niov].iov_base = &checksum; 2103 iov[niov++].iov_len = ISCSI_CRC_LEN; 2104 rx_size += ISCSI_CRC_LEN; 2105 } 2106 2107 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2108 if (rx_got != rx_size) 2109 goto reject; 2110 2111 if (conn->conn_ops->DataDigest) { 2112 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2113 text_in, payload_length, 2114 padding, (u8 *)&pad_bytes, 2115 (u8 *)&data_crc); 2116 2117 if (checksum != data_crc) { 2118 pr_err("Text data CRC32C DataDigest" 2119 " 0x%08x does not match computed" 2120 " 0x%08x\n", checksum, data_crc); 2121 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2122 pr_err("Unable to recover from" 2123 " Text Data digest failure while in" 2124 " ERL=0.\n"); 2125 goto reject; 2126 } else { 2127 /* 2128 * Silently drop this PDU and let the 2129 * initiator plug the CmdSN gap. 2130 */ 2131 pr_debug("Dropping Text" 2132 " Command CmdSN: 0x%08x due to" 2133 " DataCRC error.\n", hdr->cmdsn); 2134 kfree(text_in); 2135 return 0; 2136 } 2137 } else { 2138 pr_debug("Got CRC32C DataDigest" 2139 " 0x%08x for %u bytes of text data.\n", 2140 checksum, payload_length); 2141 } 2142 } 2143 text_in[payload_length - 1] = '\0'; 2144 pr_debug("Successfully read %d bytes of text" 2145 " data.\n", payload_length); 2146 } 2147 2148 return iscsit_process_text_cmd(conn, cmd, hdr); 2149 2150 reject: 2151 kfree(cmd->text_in_ptr); 2152 cmd->text_in_ptr = NULL; 2153 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2154 } 2155 EXPORT_SYMBOL(iscsit_handle_text_cmd); 2156 2157 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2158 { 2159 struct iscsi_conn *conn_p; 2160 struct iscsi_session *sess = conn->sess; 2161 2162 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2163 " for SID: %u.\n", conn->cid, conn->sess->sid); 2164 2165 atomic_set(&sess->session_logout, 1); 2166 atomic_set(&conn->conn_logout_remove, 1); 2167 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2168 2169 iscsit_inc_conn_usage_count(conn); 2170 iscsit_inc_session_usage_count(sess); 2171 2172 spin_lock_bh(&sess->conn_lock); 2173 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2174 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2175 continue; 2176 2177 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2178 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2179 } 2180 spin_unlock_bh(&sess->conn_lock); 2181 2182 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2183 2184 return 0; 2185 } 2186 2187 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2188 { 2189 struct iscsi_conn *l_conn; 2190 struct iscsi_session *sess = conn->sess; 2191 2192 pr_debug("Received logout request CLOSECONNECTION for CID:" 2193 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2194 2195 /* 2196 * A Logout Request with a CLOSECONNECTION reason code for a CID 2197 * can arrive on a connection with a differing CID. 2198 */ 2199 if (conn->cid == cmd->logout_cid) { 2200 spin_lock_bh(&conn->state_lock); 2201 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2202 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2203 2204 atomic_set(&conn->conn_logout_remove, 1); 2205 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2206 iscsit_inc_conn_usage_count(conn); 2207 2208 spin_unlock_bh(&conn->state_lock); 2209 } else { 2210 /* 2211 * Handle all different cid CLOSECONNECTION requests in 2212 * iscsit_logout_post_handler_diffcid() as to give enough 2213 * time for any non immediate command's CmdSN to be 2214 * acknowledged on the connection in question. 2215 * 2216 * Here we simply make sure the CID is still around. 2217 */ 2218 l_conn = iscsit_get_conn_from_cid(sess, 2219 cmd->logout_cid); 2220 if (!l_conn) { 2221 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2222 iscsit_add_cmd_to_response_queue(cmd, conn, 2223 cmd->i_state); 2224 return 0; 2225 } 2226 2227 iscsit_dec_conn_usage_count(l_conn); 2228 } 2229 2230 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2231 2232 return 0; 2233 } 2234 2235 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2236 { 2237 struct iscsi_session *sess = conn->sess; 2238 2239 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2240 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2241 2242 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2243 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2244 " while ERL!=2.\n"); 2245 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2246 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2247 return 0; 2248 } 2249 2250 if (conn->cid == cmd->logout_cid) { 2251 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2252 " with CID: %hu on CID: %hu, implementation error.\n", 2253 cmd->logout_cid, conn->cid); 2254 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2255 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2256 return 0; 2257 } 2258 2259 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2260 2261 return 0; 2262 } 2263 2264 int 2265 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2266 unsigned char *buf) 2267 { 2268 int cmdsn_ret, logout_remove = 0; 2269 u8 reason_code = 0; 2270 struct iscsi_logout *hdr; 2271 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2272 2273 hdr = (struct iscsi_logout *) buf; 2274 reason_code = (hdr->flags & 0x7f); 2275 2276 if (tiqn) { 2277 spin_lock(&tiqn->logout_stats.lock); 2278 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2279 tiqn->logout_stats.normal_logouts++; 2280 else 2281 tiqn->logout_stats.abnormal_logouts++; 2282 spin_unlock(&tiqn->logout_stats.lock); 2283 } 2284 2285 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2286 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2287 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2288 hdr->cid, conn->cid); 2289 2290 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2291 pr_err("Received logout request on connection that" 2292 " is not in logged in state, ignoring request.\n"); 2293 iscsit_free_cmd(cmd, false); 2294 return 0; 2295 } 2296 2297 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2298 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2299 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2300 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2301 cmd->targ_xfer_tag = 0xFFFFFFFF; 2302 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2303 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2304 cmd->logout_cid = be16_to_cpu(hdr->cid); 2305 cmd->logout_reason = reason_code; 2306 cmd->data_direction = DMA_NONE; 2307 2308 /* 2309 * We need to sleep in these cases (by returning 1) until the Logout 2310 * Response gets sent in the tx thread. 2311 */ 2312 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2313 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2314 be16_to_cpu(hdr->cid) == conn->cid)) 2315 logout_remove = 1; 2316 2317 spin_lock_bh(&conn->cmd_lock); 2318 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2319 spin_unlock_bh(&conn->cmd_lock); 2320 2321 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2322 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2323 2324 /* 2325 * Immediate commands are executed, well, immediately. 2326 * Non-Immediate Logout Commands are executed in CmdSN order. 2327 */ 2328 if (cmd->immediate_cmd) { 2329 int ret = iscsit_execute_cmd(cmd, 0); 2330 2331 if (ret < 0) 2332 return ret; 2333 } else { 2334 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2335 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2336 logout_remove = 0; 2337 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2338 return -1; 2339 } 2340 2341 return logout_remove; 2342 } 2343 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2344 2345 static int iscsit_handle_snack( 2346 struct iscsi_conn *conn, 2347 unsigned char *buf) 2348 { 2349 struct iscsi_snack *hdr; 2350 2351 hdr = (struct iscsi_snack *) buf; 2352 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2353 2354 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2355 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2356 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2357 hdr->begrun, hdr->runlength, conn->cid); 2358 2359 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2360 pr_err("Initiator sent SNACK request while in" 2361 " ErrorRecoveryLevel=0.\n"); 2362 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2363 buf); 2364 } 2365 /* 2366 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2367 * call from inside iscsi_send_recovery_datain_or_r2t(). 2368 */ 2369 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2370 case 0: 2371 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2372 hdr->itt, 2373 be32_to_cpu(hdr->ttt), 2374 be32_to_cpu(hdr->begrun), 2375 be32_to_cpu(hdr->runlength)); 2376 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2377 return iscsit_handle_status_snack(conn, hdr->itt, 2378 be32_to_cpu(hdr->ttt), 2379 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2380 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2381 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2382 be32_to_cpu(hdr->begrun), 2383 be32_to_cpu(hdr->runlength)); 2384 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2385 /* FIXME: Support R-Data SNACK */ 2386 pr_err("R-Data SNACK Not Supported.\n"); 2387 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2388 buf); 2389 default: 2390 pr_err("Unknown SNACK type 0x%02x, protocol" 2391 " error.\n", hdr->flags & 0x0f); 2392 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2393 buf); 2394 } 2395 2396 return 0; 2397 } 2398 2399 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2400 { 2401 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2402 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2403 wait_for_completion_interruptible_timeout( 2404 &conn->rx_half_close_comp, 2405 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2406 } 2407 } 2408 2409 static int iscsit_handle_immediate_data( 2410 struct iscsi_cmd *cmd, 2411 struct iscsi_scsi_req *hdr, 2412 u32 length) 2413 { 2414 int iov_ret, rx_got = 0, rx_size = 0; 2415 u32 checksum, iov_count = 0, padding = 0; 2416 struct iscsi_conn *conn = cmd->conn; 2417 struct kvec *iov; 2418 2419 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2420 if (iov_ret < 0) 2421 return IMMEDIATE_DATA_CANNOT_RECOVER; 2422 2423 rx_size = length; 2424 iov_count = iov_ret; 2425 iov = &cmd->iov_data[0]; 2426 2427 padding = ((-length) & 3); 2428 if (padding != 0) { 2429 iov[iov_count].iov_base = cmd->pad_bytes; 2430 iov[iov_count++].iov_len = padding; 2431 rx_size += padding; 2432 } 2433 2434 if (conn->conn_ops->DataDigest) { 2435 iov[iov_count].iov_base = &checksum; 2436 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2437 rx_size += ISCSI_CRC_LEN; 2438 } 2439 2440 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2441 2442 iscsit_unmap_iovec(cmd); 2443 2444 if (rx_got != rx_size) { 2445 iscsit_rx_thread_wait_for_tcp(conn); 2446 return IMMEDIATE_DATA_CANNOT_RECOVER; 2447 } 2448 2449 if (conn->conn_ops->DataDigest) { 2450 u32 data_crc; 2451 2452 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2453 cmd->write_data_done, length, padding, 2454 cmd->pad_bytes); 2455 2456 if (checksum != data_crc) { 2457 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2458 " does not match computed 0x%08x\n", checksum, 2459 data_crc); 2460 2461 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2462 pr_err("Unable to recover from" 2463 " Immediate Data digest failure while" 2464 " in ERL=0.\n"); 2465 iscsit_reject_cmd(cmd, 2466 ISCSI_REASON_DATA_DIGEST_ERROR, 2467 (unsigned char *)hdr); 2468 return IMMEDIATE_DATA_CANNOT_RECOVER; 2469 } else { 2470 iscsit_reject_cmd(cmd, 2471 ISCSI_REASON_DATA_DIGEST_ERROR, 2472 (unsigned char *)hdr); 2473 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2474 } 2475 } else { 2476 pr_debug("Got CRC32C DataDigest 0x%08x for" 2477 " %u bytes of Immediate Data\n", checksum, 2478 length); 2479 } 2480 } 2481 2482 cmd->write_data_done += length; 2483 2484 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2485 spin_lock_bh(&cmd->istate_lock); 2486 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2487 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2488 spin_unlock_bh(&cmd->istate_lock); 2489 } 2490 2491 return IMMEDIATE_DATA_NORMAL_OPERATION; 2492 } 2493 2494 /* 2495 * Called with sess->conn_lock held. 2496 */ 2497 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2498 with active network interface */ 2499 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2500 { 2501 struct iscsi_cmd *cmd; 2502 struct iscsi_conn *conn_p; 2503 bool found = false; 2504 2505 /* 2506 * Only send a Asynchronous Message on connections whos network 2507 * interface is still functional. 2508 */ 2509 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2510 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2511 iscsit_inc_conn_usage_count(conn_p); 2512 found = true; 2513 break; 2514 } 2515 } 2516 2517 if (!found) 2518 return; 2519 2520 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2521 if (!cmd) { 2522 iscsit_dec_conn_usage_count(conn_p); 2523 return; 2524 } 2525 2526 cmd->logout_cid = conn->cid; 2527 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2528 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2529 2530 spin_lock_bh(&conn_p->cmd_lock); 2531 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2532 spin_unlock_bh(&conn_p->cmd_lock); 2533 2534 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2535 iscsit_dec_conn_usage_count(conn_p); 2536 } 2537 2538 static int iscsit_send_conn_drop_async_message( 2539 struct iscsi_cmd *cmd, 2540 struct iscsi_conn *conn) 2541 { 2542 struct iscsi_async *hdr; 2543 2544 cmd->tx_size = ISCSI_HDR_LEN; 2545 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2546 2547 hdr = (struct iscsi_async *) cmd->pdu; 2548 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2549 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2550 cmd->init_task_tag = RESERVED_ITT; 2551 cmd->targ_xfer_tag = 0xFFFFFFFF; 2552 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2553 cmd->stat_sn = conn->stat_sn++; 2554 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2556 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2557 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2558 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2559 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2560 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2561 2562 if (conn->conn_ops->HeaderDigest) { 2563 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2564 2565 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2566 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2567 2568 cmd->tx_size += ISCSI_CRC_LEN; 2569 pr_debug("Attaching CRC32C HeaderDigest to" 2570 " Async Message 0x%08x\n", *header_digest); 2571 } 2572 2573 cmd->iov_misc[0].iov_base = cmd->pdu; 2574 cmd->iov_misc[0].iov_len = cmd->tx_size; 2575 cmd->iov_misc_count = 1; 2576 2577 pr_debug("Sending Connection Dropped Async Message StatSN:" 2578 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2579 cmd->logout_cid, conn->cid); 2580 return 0; 2581 } 2582 2583 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2584 { 2585 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2586 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2587 wait_for_completion_interruptible_timeout( 2588 &conn->tx_half_close_comp, 2589 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2590 } 2591 } 2592 2593 static void 2594 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2595 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2596 bool set_statsn) 2597 { 2598 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2599 hdr->flags = datain->flags; 2600 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2601 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2602 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2603 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2604 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2605 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2607 } 2608 } 2609 hton24(hdr->dlength, datain->length); 2610 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2611 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2612 (struct scsi_lun *)&hdr->lun); 2613 else 2614 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2615 2616 hdr->itt = cmd->init_task_tag; 2617 2618 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2619 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2620 else 2621 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2622 if (set_statsn) 2623 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2624 else 2625 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2626 2627 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2628 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2629 hdr->datasn = cpu_to_be32(datain->data_sn); 2630 hdr->offset = cpu_to_be32(datain->offset); 2631 2632 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2633 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2634 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2635 ntohl(hdr->offset), datain->length, conn->cid); 2636 } 2637 2638 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2639 { 2640 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2641 struct iscsi_datain datain; 2642 struct iscsi_datain_req *dr; 2643 struct kvec *iov; 2644 u32 iov_count = 0, tx_size = 0; 2645 int eodr = 0, ret, iov_ret; 2646 bool set_statsn = false; 2647 2648 memset(&datain, 0, sizeof(struct iscsi_datain)); 2649 dr = iscsit_get_datain_values(cmd, &datain); 2650 if (!dr) { 2651 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2652 cmd->init_task_tag); 2653 return -1; 2654 } 2655 /* 2656 * Be paranoid and double check the logic for now. 2657 */ 2658 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2659 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2660 " datain.length: %u exceeds cmd->data_length: %u\n", 2661 cmd->init_task_tag, datain.offset, datain.length, 2662 cmd->se_cmd.data_length); 2663 return -1; 2664 } 2665 2666 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2667 /* 2668 * Special case for successfully execution w/ both DATAIN 2669 * and Sense Data. 2670 */ 2671 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2672 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2673 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2674 else { 2675 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2676 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2677 iscsit_increment_maxcmdsn(cmd, conn->sess); 2678 cmd->stat_sn = conn->stat_sn++; 2679 set_statsn = true; 2680 } else if (dr->dr_complete == 2681 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2682 set_statsn = true; 2683 } 2684 2685 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2686 2687 iov = &cmd->iov_data[0]; 2688 iov[iov_count].iov_base = cmd->pdu; 2689 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2690 tx_size += ISCSI_HDR_LEN; 2691 2692 if (conn->conn_ops->HeaderDigest) { 2693 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2694 2695 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2696 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2697 2698 iov[0].iov_len += ISCSI_CRC_LEN; 2699 tx_size += ISCSI_CRC_LEN; 2700 2701 pr_debug("Attaching CRC32 HeaderDigest" 2702 " for DataIN PDU 0x%08x\n", *header_digest); 2703 } 2704 2705 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2706 datain.offset, datain.length); 2707 if (iov_ret < 0) 2708 return -1; 2709 2710 iov_count += iov_ret; 2711 tx_size += datain.length; 2712 2713 cmd->padding = ((-datain.length) & 3); 2714 if (cmd->padding) { 2715 iov[iov_count].iov_base = cmd->pad_bytes; 2716 iov[iov_count++].iov_len = cmd->padding; 2717 tx_size += cmd->padding; 2718 2719 pr_debug("Attaching %u padding bytes\n", 2720 cmd->padding); 2721 } 2722 if (conn->conn_ops->DataDigest) { 2723 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2724 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2725 2726 iov[iov_count].iov_base = &cmd->data_crc; 2727 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2728 tx_size += ISCSI_CRC_LEN; 2729 2730 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2731 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2732 } 2733 2734 cmd->iov_data_count = iov_count; 2735 cmd->tx_size = tx_size; 2736 2737 /* sendpage is preferred but can't insert markers */ 2738 if (!conn->conn_ops->IFMarker) 2739 ret = iscsit_fe_sendpage_sg(cmd, conn); 2740 else 2741 ret = iscsit_send_tx_data(cmd, conn, 0); 2742 2743 iscsit_unmap_iovec(cmd); 2744 2745 if (ret < 0) { 2746 iscsit_tx_thread_wait_for_tcp(conn); 2747 return ret; 2748 } 2749 2750 if (dr->dr_complete) { 2751 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2752 2 : 1; 2753 iscsit_free_datain_req(cmd, dr); 2754 } 2755 2756 return eodr; 2757 } 2758 2759 int 2760 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2761 struct iscsi_logout_rsp *hdr) 2762 { 2763 struct iscsi_conn *logout_conn = NULL; 2764 struct iscsi_conn_recovery *cr = NULL; 2765 struct iscsi_session *sess = conn->sess; 2766 /* 2767 * The actual shutting down of Sessions and/or Connections 2768 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2769 * is done in scsi_logout_post_handler(). 2770 */ 2771 switch (cmd->logout_reason) { 2772 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2773 pr_debug("iSCSI session logout successful, setting" 2774 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2775 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2776 break; 2777 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2778 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2779 break; 2780 /* 2781 * For CLOSECONNECTION logout requests carrying 2782 * a matching logout CID -> local CID, the reference 2783 * for the local CID will have been incremented in 2784 * iscsi_logout_closeconnection(). 2785 * 2786 * For CLOSECONNECTION logout requests carrying 2787 * a different CID than the connection it arrived 2788 * on, the connection responding to cmd->logout_cid 2789 * is stopped in iscsit_logout_post_handler_diffcid(). 2790 */ 2791 2792 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2793 " successful.\n", cmd->logout_cid, conn->cid); 2794 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2795 break; 2796 case ISCSI_LOGOUT_REASON_RECOVERY: 2797 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2798 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2799 break; 2800 /* 2801 * If the connection is still active from our point of view 2802 * force connection recovery to occur. 2803 */ 2804 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2805 cmd->logout_cid); 2806 if (logout_conn) { 2807 iscsit_connection_reinstatement_rcfr(logout_conn); 2808 iscsit_dec_conn_usage_count(logout_conn); 2809 } 2810 2811 cr = iscsit_get_inactive_connection_recovery_entry( 2812 conn->sess, cmd->logout_cid); 2813 if (!cr) { 2814 pr_err("Unable to locate CID: %hu for" 2815 " REMOVECONNFORRECOVERY Logout Request.\n", 2816 cmd->logout_cid); 2817 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2818 break; 2819 } 2820 2821 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2822 2823 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2824 " for recovery for CID: %hu on CID: %hu successful.\n", 2825 cmd->logout_cid, conn->cid); 2826 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2827 break; 2828 default: 2829 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2830 cmd->logout_reason); 2831 return -1; 2832 } 2833 2834 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2835 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2836 hdr->response = cmd->logout_response; 2837 hdr->itt = cmd->init_task_tag; 2838 cmd->stat_sn = conn->stat_sn++; 2839 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2840 2841 iscsit_increment_maxcmdsn(cmd, conn->sess); 2842 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2843 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2844 2845 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2846 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2847 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2848 cmd->logout_cid, conn->cid); 2849 2850 return 0; 2851 } 2852 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2853 2854 static int 2855 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2856 { 2857 struct kvec *iov; 2858 int niov = 0, tx_size, rc; 2859 2860 rc = iscsit_build_logout_rsp(cmd, conn, 2861 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2862 if (rc < 0) 2863 return rc; 2864 2865 tx_size = ISCSI_HDR_LEN; 2866 iov = &cmd->iov_misc[0]; 2867 iov[niov].iov_base = cmd->pdu; 2868 iov[niov++].iov_len = ISCSI_HDR_LEN; 2869 2870 if (conn->conn_ops->HeaderDigest) { 2871 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2872 2873 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2874 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2875 2876 iov[0].iov_len += ISCSI_CRC_LEN; 2877 tx_size += ISCSI_CRC_LEN; 2878 pr_debug("Attaching CRC32C HeaderDigest to" 2879 " Logout Response 0x%08x\n", *header_digest); 2880 } 2881 cmd->iov_misc_count = niov; 2882 cmd->tx_size = tx_size; 2883 2884 return 0; 2885 } 2886 2887 void 2888 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2889 struct iscsi_nopin *hdr, bool nopout_response) 2890 { 2891 hdr->opcode = ISCSI_OP_NOOP_IN; 2892 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2893 hton24(hdr->dlength, cmd->buf_ptr_size); 2894 if (nopout_response) 2895 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2896 hdr->itt = cmd->init_task_tag; 2897 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2898 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2899 conn->stat_sn; 2900 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2901 2902 if (nopout_response) 2903 iscsit_increment_maxcmdsn(cmd, conn->sess); 2904 2905 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2906 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2907 2908 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2909 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2910 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2911 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2912 } 2913 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2914 2915 /* 2916 * Unsolicited NOPIN, either requesting a response or not. 2917 */ 2918 static int iscsit_send_unsolicited_nopin( 2919 struct iscsi_cmd *cmd, 2920 struct iscsi_conn *conn, 2921 int want_response) 2922 { 2923 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2924 int tx_size = ISCSI_HDR_LEN, ret; 2925 2926 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2927 2928 if (conn->conn_ops->HeaderDigest) { 2929 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2930 2931 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2932 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2933 2934 tx_size += ISCSI_CRC_LEN; 2935 pr_debug("Attaching CRC32C HeaderDigest to" 2936 " NopIN 0x%08x\n", *header_digest); 2937 } 2938 2939 cmd->iov_misc[0].iov_base = cmd->pdu; 2940 cmd->iov_misc[0].iov_len = tx_size; 2941 cmd->iov_misc_count = 1; 2942 cmd->tx_size = tx_size; 2943 2944 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2945 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2946 2947 ret = iscsit_send_tx_data(cmd, conn, 1); 2948 if (ret < 0) { 2949 iscsit_tx_thread_wait_for_tcp(conn); 2950 return ret; 2951 } 2952 2953 spin_lock_bh(&cmd->istate_lock); 2954 cmd->i_state = want_response ? 2955 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2956 spin_unlock_bh(&cmd->istate_lock); 2957 2958 return 0; 2959 } 2960 2961 static int 2962 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2963 { 2964 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2965 struct kvec *iov; 2966 u32 padding = 0; 2967 int niov = 0, tx_size; 2968 2969 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2970 2971 tx_size = ISCSI_HDR_LEN; 2972 iov = &cmd->iov_misc[0]; 2973 iov[niov].iov_base = cmd->pdu; 2974 iov[niov++].iov_len = ISCSI_HDR_LEN; 2975 2976 if (conn->conn_ops->HeaderDigest) { 2977 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2978 2979 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2980 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2981 2982 iov[0].iov_len += ISCSI_CRC_LEN; 2983 tx_size += ISCSI_CRC_LEN; 2984 pr_debug("Attaching CRC32C HeaderDigest" 2985 " to NopIn 0x%08x\n", *header_digest); 2986 } 2987 2988 /* 2989 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2990 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2991 */ 2992 if (cmd->buf_ptr_size) { 2993 iov[niov].iov_base = cmd->buf_ptr; 2994 iov[niov++].iov_len = cmd->buf_ptr_size; 2995 tx_size += cmd->buf_ptr_size; 2996 2997 pr_debug("Echoing back %u bytes of ping" 2998 " data.\n", cmd->buf_ptr_size); 2999 3000 padding = ((-cmd->buf_ptr_size) & 3); 3001 if (padding != 0) { 3002 iov[niov].iov_base = &cmd->pad_bytes; 3003 iov[niov++].iov_len = padding; 3004 tx_size += padding; 3005 pr_debug("Attaching %u additional" 3006 " padding bytes.\n", padding); 3007 } 3008 if (conn->conn_ops->DataDigest) { 3009 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3010 cmd->buf_ptr, cmd->buf_ptr_size, 3011 padding, (u8 *)&cmd->pad_bytes, 3012 (u8 *)&cmd->data_crc); 3013 3014 iov[niov].iov_base = &cmd->data_crc; 3015 iov[niov++].iov_len = ISCSI_CRC_LEN; 3016 tx_size += ISCSI_CRC_LEN; 3017 pr_debug("Attached DataDigest for %u" 3018 " bytes of ping data, CRC 0x%08x\n", 3019 cmd->buf_ptr_size, cmd->data_crc); 3020 } 3021 } 3022 3023 cmd->iov_misc_count = niov; 3024 cmd->tx_size = tx_size; 3025 3026 return 0; 3027 } 3028 3029 static int iscsit_send_r2t( 3030 struct iscsi_cmd *cmd, 3031 struct iscsi_conn *conn) 3032 { 3033 int tx_size = 0; 3034 struct iscsi_r2t *r2t; 3035 struct iscsi_r2t_rsp *hdr; 3036 int ret; 3037 3038 r2t = iscsit_get_r2t_from_list(cmd); 3039 if (!r2t) 3040 return -1; 3041 3042 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3043 memset(hdr, 0, ISCSI_HDR_LEN); 3044 hdr->opcode = ISCSI_OP_R2T; 3045 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3046 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3047 (struct scsi_lun *)&hdr->lun); 3048 hdr->itt = cmd->init_task_tag; 3049 spin_lock_bh(&conn->sess->ttt_lock); 3050 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3051 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 3052 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3053 spin_unlock_bh(&conn->sess->ttt_lock); 3054 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3055 hdr->statsn = cpu_to_be32(conn->stat_sn); 3056 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3057 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3058 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3059 hdr->data_offset = cpu_to_be32(r2t->offset); 3060 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3061 3062 cmd->iov_misc[0].iov_base = cmd->pdu; 3063 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3064 tx_size += ISCSI_HDR_LEN; 3065 3066 if (conn->conn_ops->HeaderDigest) { 3067 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3068 3069 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3070 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3071 3072 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3073 tx_size += ISCSI_CRC_LEN; 3074 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3075 " PDU 0x%08x\n", *header_digest); 3076 } 3077 3078 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3079 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3080 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3081 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3082 r2t->offset, r2t->xfer_len, conn->cid); 3083 3084 cmd->iov_misc_count = 1; 3085 cmd->tx_size = tx_size; 3086 3087 spin_lock_bh(&cmd->r2t_lock); 3088 r2t->sent_r2t = 1; 3089 spin_unlock_bh(&cmd->r2t_lock); 3090 3091 ret = iscsit_send_tx_data(cmd, conn, 1); 3092 if (ret < 0) { 3093 iscsit_tx_thread_wait_for_tcp(conn); 3094 return ret; 3095 } 3096 3097 spin_lock_bh(&cmd->dataout_timeout_lock); 3098 iscsit_start_dataout_timer(cmd, conn); 3099 spin_unlock_bh(&cmd->dataout_timeout_lock); 3100 3101 return 0; 3102 } 3103 3104 /* 3105 * @recovery: If called from iscsi_task_reassign_complete_write() for 3106 * connection recovery. 3107 */ 3108 int iscsit_build_r2ts_for_cmd( 3109 struct iscsi_conn *conn, 3110 struct iscsi_cmd *cmd, 3111 bool recovery) 3112 { 3113 int first_r2t = 1; 3114 u32 offset = 0, xfer_len = 0; 3115 3116 spin_lock_bh(&cmd->r2t_lock); 3117 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3118 spin_unlock_bh(&cmd->r2t_lock); 3119 return 0; 3120 } 3121 3122 if (conn->sess->sess_ops->DataSequenceInOrder && 3123 !recovery) 3124 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3125 3126 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3127 if (conn->sess->sess_ops->DataSequenceInOrder) { 3128 offset = cmd->r2t_offset; 3129 3130 if (first_r2t && recovery) { 3131 int new_data_end = offset + 3132 conn->sess->sess_ops->MaxBurstLength - 3133 cmd->next_burst_len; 3134 3135 if (new_data_end > cmd->se_cmd.data_length) 3136 xfer_len = cmd->se_cmd.data_length - offset; 3137 else 3138 xfer_len = 3139 conn->sess->sess_ops->MaxBurstLength - 3140 cmd->next_burst_len; 3141 } else { 3142 int new_data_end = offset + 3143 conn->sess->sess_ops->MaxBurstLength; 3144 3145 if (new_data_end > cmd->se_cmd.data_length) 3146 xfer_len = cmd->se_cmd.data_length - offset; 3147 else 3148 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3149 } 3150 cmd->r2t_offset += xfer_len; 3151 3152 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3154 } else { 3155 struct iscsi_seq *seq; 3156 3157 seq = iscsit_get_seq_holder_for_r2t(cmd); 3158 if (!seq) { 3159 spin_unlock_bh(&cmd->r2t_lock); 3160 return -1; 3161 } 3162 3163 offset = seq->offset; 3164 xfer_len = seq->xfer_len; 3165 3166 if (cmd->seq_send_order == cmd->seq_count) 3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3168 } 3169 cmd->outstanding_r2ts++; 3170 first_r2t = 0; 3171 3172 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3173 spin_unlock_bh(&cmd->r2t_lock); 3174 return -1; 3175 } 3176 3177 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3178 break; 3179 } 3180 spin_unlock_bh(&cmd->r2t_lock); 3181 3182 return 0; 3183 } 3184 3185 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3186 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3187 { 3188 if (inc_stat_sn) 3189 cmd->stat_sn = conn->stat_sn++; 3190 3191 atomic_long_inc(&conn->sess->rsp_pdus); 3192 3193 memset(hdr, 0, ISCSI_HDR_LEN); 3194 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3195 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3196 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3197 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3198 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3199 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3200 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3202 } 3203 hdr->response = cmd->iscsi_response; 3204 hdr->cmd_status = cmd->se_cmd.scsi_status; 3205 hdr->itt = cmd->init_task_tag; 3206 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3207 3208 iscsit_increment_maxcmdsn(cmd, conn->sess); 3209 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3210 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3211 3212 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3213 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3214 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3215 cmd->se_cmd.scsi_status, conn->cid); 3216 } 3217 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3218 3219 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3220 { 3221 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3222 struct kvec *iov; 3223 u32 padding = 0, tx_size = 0; 3224 int iov_count = 0; 3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3226 3227 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3228 3229 iov = &cmd->iov_misc[0]; 3230 iov[iov_count].iov_base = cmd->pdu; 3231 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3232 tx_size += ISCSI_HDR_LEN; 3233 3234 /* 3235 * Attach SENSE DATA payload to iSCSI Response PDU 3236 */ 3237 if (cmd->se_cmd.sense_buffer && 3238 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3239 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3240 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3241 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3242 3243 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3244 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3245 iov[iov_count].iov_base = cmd->sense_buffer; 3246 iov[iov_count++].iov_len = 3247 (cmd->se_cmd.scsi_sense_length + padding); 3248 tx_size += cmd->se_cmd.scsi_sense_length; 3249 3250 if (padding) { 3251 memset(cmd->sense_buffer + 3252 cmd->se_cmd.scsi_sense_length, 0, padding); 3253 tx_size += padding; 3254 pr_debug("Adding %u bytes of padding to" 3255 " SENSE.\n", padding); 3256 } 3257 3258 if (conn->conn_ops->DataDigest) { 3259 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3260 cmd->sense_buffer, 3261 (cmd->se_cmd.scsi_sense_length + padding), 3262 0, NULL, (u8 *)&cmd->data_crc); 3263 3264 iov[iov_count].iov_base = &cmd->data_crc; 3265 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3266 tx_size += ISCSI_CRC_LEN; 3267 3268 pr_debug("Attaching CRC32 DataDigest for" 3269 " SENSE, %u bytes CRC 0x%08x\n", 3270 (cmd->se_cmd.scsi_sense_length + padding), 3271 cmd->data_crc); 3272 } 3273 3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3275 " Response PDU\n", 3276 cmd->se_cmd.scsi_sense_length); 3277 } 3278 3279 if (conn->conn_ops->HeaderDigest) { 3280 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3281 3282 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3283 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3284 3285 iov[0].iov_len += ISCSI_CRC_LEN; 3286 tx_size += ISCSI_CRC_LEN; 3287 pr_debug("Attaching CRC32 HeaderDigest for Response" 3288 " PDU 0x%08x\n", *header_digest); 3289 } 3290 3291 cmd->iov_misc_count = iov_count; 3292 cmd->tx_size = tx_size; 3293 3294 return 0; 3295 } 3296 3297 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3298 { 3299 switch (se_tmr->response) { 3300 case TMR_FUNCTION_COMPLETE: 3301 return ISCSI_TMF_RSP_COMPLETE; 3302 case TMR_TASK_DOES_NOT_EXIST: 3303 return ISCSI_TMF_RSP_NO_TASK; 3304 case TMR_LUN_DOES_NOT_EXIST: 3305 return ISCSI_TMF_RSP_NO_LUN; 3306 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3307 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3308 case TMR_FUNCTION_REJECTED: 3309 default: 3310 return ISCSI_TMF_RSP_REJECTED; 3311 } 3312 } 3313 3314 void 3315 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3316 struct iscsi_tm_rsp *hdr) 3317 { 3318 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3319 3320 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3321 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3322 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3323 hdr->itt = cmd->init_task_tag; 3324 cmd->stat_sn = conn->stat_sn++; 3325 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3326 3327 iscsit_increment_maxcmdsn(cmd, conn->sess); 3328 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3329 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3330 3331 pr_debug("Built Task Management Response ITT: 0x%08x," 3332 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3333 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3334 } 3335 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3336 3337 static int 3338 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3339 { 3340 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3341 u32 tx_size = 0; 3342 3343 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3344 3345 cmd->iov_misc[0].iov_base = cmd->pdu; 3346 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3347 tx_size += ISCSI_HDR_LEN; 3348 3349 if (conn->conn_ops->HeaderDigest) { 3350 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3351 3352 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3353 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3354 3355 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3356 tx_size += ISCSI_CRC_LEN; 3357 pr_debug("Attaching CRC32 HeaderDigest for Task" 3358 " Mgmt Response PDU 0x%08x\n", *header_digest); 3359 } 3360 3361 cmd->iov_misc_count = 1; 3362 cmd->tx_size = tx_size; 3363 3364 return 0; 3365 } 3366 3367 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3368 { 3369 bool ret = false; 3370 3371 if (np->np_sockaddr.ss_family == AF_INET6) { 3372 const struct sockaddr_in6 sin6 = { 3373 .sin6_addr = IN6ADDR_ANY_INIT }; 3374 struct sockaddr_in6 *sock_in6 = 3375 (struct sockaddr_in6 *)&np->np_sockaddr; 3376 3377 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3378 sin6.sin6_addr.s6_addr, 16)) 3379 ret = true; 3380 } else { 3381 struct sockaddr_in * sock_in = 3382 (struct sockaddr_in *)&np->np_sockaddr; 3383 3384 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3385 ret = true; 3386 } 3387 3388 return ret; 3389 } 3390 3391 #define SENDTARGETS_BUF_LIMIT 32768U 3392 3393 static int 3394 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3395 enum iscsit_transport_type network_transport) 3396 { 3397 char *payload = NULL; 3398 struct iscsi_conn *conn = cmd->conn; 3399 struct iscsi_portal_group *tpg; 3400 struct iscsi_tiqn *tiqn; 3401 struct iscsi_tpg_np *tpg_np; 3402 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3403 int target_name_printed; 3404 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3405 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3406 3407 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3408 SENDTARGETS_BUF_LIMIT); 3409 3410 payload = kzalloc(buffer_len, GFP_KERNEL); 3411 if (!payload) { 3412 pr_err("Unable to allocate memory for sendtargets" 3413 " response.\n"); 3414 return -ENOMEM; 3415 } 3416 /* 3417 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE 3418 * explicit case.. 3419 */ 3420 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) { 3421 text_ptr = strchr(text_in, '='); 3422 if (!text_ptr) { 3423 pr_err("Unable to locate '=' string in text_in:" 3424 " %s\n", text_in); 3425 kfree(payload); 3426 return -EINVAL; 3427 } 3428 /* 3429 * Skip over '=' character.. 3430 */ 3431 text_ptr += 1; 3432 } 3433 3434 spin_lock(&tiqn_lock); 3435 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3436 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) && 3437 strcmp(tiqn->tiqn, text_ptr)) { 3438 continue; 3439 } 3440 3441 target_name_printed = 0; 3442 3443 spin_lock(&tiqn->tiqn_tpg_lock); 3444 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3445 3446 /* If demo_mode_discovery=0 and generate_node_acls=0 3447 * (demo mode dislabed) do not return 3448 * TargetName+TargetAddress unless a NodeACL exists. 3449 */ 3450 3451 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3452 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3453 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg, 3454 cmd->conn->sess->sess_ops->InitiatorName))) { 3455 continue; 3456 } 3457 3458 spin_lock(&tpg->tpg_state_lock); 3459 if ((tpg->tpg_state == TPG_STATE_FREE) || 3460 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3461 spin_unlock(&tpg->tpg_state_lock); 3462 continue; 3463 } 3464 spin_unlock(&tpg->tpg_state_lock); 3465 3466 spin_lock(&tpg->tpg_np_lock); 3467 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3468 tpg_np_list) { 3469 struct iscsi_np *np = tpg_np->tpg_np; 3470 bool inaddr_any = iscsit_check_inaddr_any(np); 3471 3472 if (np->np_network_transport != network_transport) 3473 continue; 3474 3475 if (!target_name_printed) { 3476 len = sprintf(buf, "TargetName=%s", 3477 tiqn->tiqn); 3478 len += 1; 3479 3480 if ((len + payload_len) > buffer_len) { 3481 spin_unlock(&tpg->tpg_np_lock); 3482 spin_unlock(&tiqn->tiqn_tpg_lock); 3483 end_of_buf = 1; 3484 goto eob; 3485 } 3486 memcpy(payload + payload_len, buf, len); 3487 payload_len += len; 3488 target_name_printed = 1; 3489 } 3490 3491 len = sprintf(buf, "TargetAddress=" 3492 "%s:%hu,%hu", 3493 inaddr_any ? conn->local_ip : np->np_ip, 3494 inaddr_any ? conn->local_port : np->np_port, 3495 tpg->tpgt); 3496 len += 1; 3497 3498 if ((len + payload_len) > buffer_len) { 3499 spin_unlock(&tpg->tpg_np_lock); 3500 spin_unlock(&tiqn->tiqn_tpg_lock); 3501 end_of_buf = 1; 3502 goto eob; 3503 } 3504 memcpy(payload + payload_len, buf, len); 3505 payload_len += len; 3506 } 3507 spin_unlock(&tpg->tpg_np_lock); 3508 } 3509 spin_unlock(&tiqn->tiqn_tpg_lock); 3510 eob: 3511 if (end_of_buf) 3512 break; 3513 3514 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) 3515 break; 3516 } 3517 spin_unlock(&tiqn_lock); 3518 3519 cmd->buf_ptr = payload; 3520 3521 return payload_len; 3522 } 3523 3524 int 3525 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3526 struct iscsi_text_rsp *hdr, 3527 enum iscsit_transport_type network_transport) 3528 { 3529 int text_length, padding; 3530 3531 text_length = iscsit_build_sendtargets_response(cmd, network_transport); 3532 if (text_length < 0) 3533 return text_length; 3534 3535 hdr->opcode = ISCSI_OP_TEXT_RSP; 3536 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3537 padding = ((-text_length) & 3); 3538 hton24(hdr->dlength, text_length); 3539 hdr->itt = cmd->init_task_tag; 3540 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3541 cmd->stat_sn = conn->stat_sn++; 3542 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3543 3544 iscsit_increment_maxcmdsn(cmd, conn->sess); 3545 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3546 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3547 3548 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3549 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3550 text_length, conn->cid); 3551 3552 return text_length + padding; 3553 } 3554 EXPORT_SYMBOL(iscsit_build_text_rsp); 3555 3556 /* 3557 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3558 * MaxRecvDataSegmentLength. 3559 */ 3560 static int iscsit_send_text_rsp( 3561 struct iscsi_cmd *cmd, 3562 struct iscsi_conn *conn) 3563 { 3564 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3565 struct kvec *iov; 3566 u32 tx_size = 0; 3567 int text_length, iov_count = 0, rc; 3568 3569 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP); 3570 if (rc < 0) 3571 return rc; 3572 3573 text_length = rc; 3574 iov = &cmd->iov_misc[0]; 3575 iov[iov_count].iov_base = cmd->pdu; 3576 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3577 iov[iov_count].iov_base = cmd->buf_ptr; 3578 iov[iov_count++].iov_len = text_length; 3579 3580 tx_size += (ISCSI_HDR_LEN + text_length); 3581 3582 if (conn->conn_ops->HeaderDigest) { 3583 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3584 3585 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3586 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3587 3588 iov[0].iov_len += ISCSI_CRC_LEN; 3589 tx_size += ISCSI_CRC_LEN; 3590 pr_debug("Attaching CRC32 HeaderDigest for" 3591 " Text Response PDU 0x%08x\n", *header_digest); 3592 } 3593 3594 if (conn->conn_ops->DataDigest) { 3595 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3596 cmd->buf_ptr, text_length, 3597 0, NULL, (u8 *)&cmd->data_crc); 3598 3599 iov[iov_count].iov_base = &cmd->data_crc; 3600 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3601 tx_size += ISCSI_CRC_LEN; 3602 3603 pr_debug("Attaching DataDigest for %u bytes of text" 3604 " data, CRC 0x%08x\n", text_length, 3605 cmd->data_crc); 3606 } 3607 3608 cmd->iov_misc_count = iov_count; 3609 cmd->tx_size = tx_size; 3610 3611 return 0; 3612 } 3613 3614 void 3615 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3616 struct iscsi_reject *hdr) 3617 { 3618 hdr->opcode = ISCSI_OP_REJECT; 3619 hdr->reason = cmd->reject_reason; 3620 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3621 hton24(hdr->dlength, ISCSI_HDR_LEN); 3622 hdr->ffffffff = cpu_to_be32(0xffffffff); 3623 cmd->stat_sn = conn->stat_sn++; 3624 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3625 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3626 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3627 3628 } 3629 EXPORT_SYMBOL(iscsit_build_reject); 3630 3631 static int iscsit_send_reject( 3632 struct iscsi_cmd *cmd, 3633 struct iscsi_conn *conn) 3634 { 3635 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3636 struct kvec *iov; 3637 u32 iov_count = 0, tx_size; 3638 3639 iscsit_build_reject(cmd, conn, hdr); 3640 3641 iov = &cmd->iov_misc[0]; 3642 iov[iov_count].iov_base = cmd->pdu; 3643 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3644 iov[iov_count].iov_base = cmd->buf_ptr; 3645 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3646 3647 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3648 3649 if (conn->conn_ops->HeaderDigest) { 3650 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3651 3652 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3653 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3654 3655 iov[0].iov_len += ISCSI_CRC_LEN; 3656 tx_size += ISCSI_CRC_LEN; 3657 pr_debug("Attaching CRC32 HeaderDigest for" 3658 " REJECT PDU 0x%08x\n", *header_digest); 3659 } 3660 3661 if (conn->conn_ops->DataDigest) { 3662 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3663 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3664 3665 iov[iov_count].iov_base = &cmd->data_crc; 3666 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3667 tx_size += ISCSI_CRC_LEN; 3668 pr_debug("Attaching CRC32 DataDigest for REJECT" 3669 " PDU 0x%08x\n", cmd->data_crc); 3670 } 3671 3672 cmd->iov_misc_count = iov_count; 3673 cmd->tx_size = tx_size; 3674 3675 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3676 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3677 3678 return 0; 3679 } 3680 3681 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3682 { 3683 struct iscsi_thread_set *ts = conn->thread_set; 3684 int ord, cpu; 3685 /* 3686 * thread_id is assigned from iscsit_global->ts_bitmap from 3687 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3688 * 3689 * Here we use thread_id to determine which CPU that this 3690 * iSCSI connection's iscsi_thread_set will be scheduled to 3691 * execute upon. 3692 */ 3693 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3694 for_each_online_cpu(cpu) { 3695 if (ord-- == 0) { 3696 cpumask_set_cpu(cpu, conn->conn_cpumask); 3697 return; 3698 } 3699 } 3700 /* 3701 * This should never be reached.. 3702 */ 3703 dump_stack(); 3704 cpumask_setall(conn->conn_cpumask); 3705 } 3706 3707 static inline void iscsit_thread_check_cpumask( 3708 struct iscsi_conn *conn, 3709 struct task_struct *p, 3710 int mode) 3711 { 3712 char buf[128]; 3713 /* 3714 * mode == 1 signals iscsi_target_tx_thread() usage. 3715 * mode == 0 signals iscsi_target_rx_thread() usage. 3716 */ 3717 if (mode == 1) { 3718 if (!conn->conn_tx_reset_cpumask) 3719 return; 3720 conn->conn_tx_reset_cpumask = 0; 3721 } else { 3722 if (!conn->conn_rx_reset_cpumask) 3723 return; 3724 conn->conn_rx_reset_cpumask = 0; 3725 } 3726 /* 3727 * Update the CPU mask for this single kthread so that 3728 * both TX and RX kthreads are scheduled to run on the 3729 * same CPU. 3730 */ 3731 memset(buf, 0, 128); 3732 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3733 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3734 } 3735 3736 static int 3737 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3738 { 3739 int ret; 3740 3741 switch (state) { 3742 case ISTATE_SEND_R2T: 3743 ret = iscsit_send_r2t(cmd, conn); 3744 if (ret < 0) 3745 goto err; 3746 break; 3747 case ISTATE_REMOVE: 3748 spin_lock_bh(&conn->cmd_lock); 3749 list_del_init(&cmd->i_conn_node); 3750 spin_unlock_bh(&conn->cmd_lock); 3751 3752 iscsit_free_cmd(cmd, false); 3753 break; 3754 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3755 iscsit_mod_nopin_response_timer(conn); 3756 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3757 if (ret < 0) 3758 goto err; 3759 break; 3760 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3761 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3762 if (ret < 0) 3763 goto err; 3764 break; 3765 default: 3766 pr_err("Unknown Opcode: 0x%02x ITT:" 3767 " 0x%08x, i_state: %d on CID: %hu\n", 3768 cmd->iscsi_opcode, cmd->init_task_tag, state, 3769 conn->cid); 3770 goto err; 3771 } 3772 3773 return 0; 3774 3775 err: 3776 return -1; 3777 } 3778 3779 static int 3780 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3781 { 3782 struct iscsit_transport *t = conn->conn_transport; 3783 struct iscsi_queue_req *qr; 3784 struct iscsi_cmd *cmd; 3785 u8 state; 3786 int ret; 3787 3788 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3789 atomic_set(&conn->check_immediate_queue, 0); 3790 cmd = qr->cmd; 3791 state = qr->state; 3792 kmem_cache_free(lio_qr_cache, qr); 3793 3794 ret = t->iscsit_immediate_queue(conn, cmd, state); 3795 if (ret < 0) 3796 return ret; 3797 } 3798 3799 return 0; 3800 } 3801 3802 static int 3803 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3804 { 3805 int ret; 3806 3807 check_rsp_state: 3808 switch (state) { 3809 case ISTATE_SEND_DATAIN: 3810 ret = iscsit_send_datain(cmd, conn); 3811 if (ret < 0) 3812 goto err; 3813 else if (!ret) 3814 /* more drs */ 3815 goto check_rsp_state; 3816 else if (ret == 1) { 3817 /* all done */ 3818 spin_lock_bh(&cmd->istate_lock); 3819 cmd->i_state = ISTATE_SENT_STATUS; 3820 spin_unlock_bh(&cmd->istate_lock); 3821 3822 if (atomic_read(&conn->check_immediate_queue)) 3823 return 1; 3824 3825 return 0; 3826 } else if (ret == 2) { 3827 /* Still must send status, 3828 SCF_TRANSPORT_TASK_SENSE was set */ 3829 spin_lock_bh(&cmd->istate_lock); 3830 cmd->i_state = ISTATE_SEND_STATUS; 3831 spin_unlock_bh(&cmd->istate_lock); 3832 state = ISTATE_SEND_STATUS; 3833 goto check_rsp_state; 3834 } 3835 3836 break; 3837 case ISTATE_SEND_STATUS: 3838 case ISTATE_SEND_STATUS_RECOVERY: 3839 ret = iscsit_send_response(cmd, conn); 3840 break; 3841 case ISTATE_SEND_LOGOUTRSP: 3842 ret = iscsit_send_logout(cmd, conn); 3843 break; 3844 case ISTATE_SEND_ASYNCMSG: 3845 ret = iscsit_send_conn_drop_async_message( 3846 cmd, conn); 3847 break; 3848 case ISTATE_SEND_NOPIN: 3849 ret = iscsit_send_nopin(cmd, conn); 3850 break; 3851 case ISTATE_SEND_REJECT: 3852 ret = iscsit_send_reject(cmd, conn); 3853 break; 3854 case ISTATE_SEND_TASKMGTRSP: 3855 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3856 if (ret != 0) 3857 break; 3858 ret = iscsit_tmr_post_handler(cmd, conn); 3859 if (ret != 0) 3860 iscsit_fall_back_to_erl0(conn->sess); 3861 break; 3862 case ISTATE_SEND_TEXTRSP: 3863 ret = iscsit_send_text_rsp(cmd, conn); 3864 break; 3865 default: 3866 pr_err("Unknown Opcode: 0x%02x ITT:" 3867 " 0x%08x, i_state: %d on CID: %hu\n", 3868 cmd->iscsi_opcode, cmd->init_task_tag, 3869 state, conn->cid); 3870 goto err; 3871 } 3872 if (ret < 0) 3873 goto err; 3874 3875 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3876 iscsit_tx_thread_wait_for_tcp(conn); 3877 iscsit_unmap_iovec(cmd); 3878 goto err; 3879 } 3880 iscsit_unmap_iovec(cmd); 3881 3882 switch (state) { 3883 case ISTATE_SEND_LOGOUTRSP: 3884 if (!iscsit_logout_post_handler(cmd, conn)) 3885 goto restart; 3886 /* fall through */ 3887 case ISTATE_SEND_STATUS: 3888 case ISTATE_SEND_ASYNCMSG: 3889 case ISTATE_SEND_NOPIN: 3890 case ISTATE_SEND_STATUS_RECOVERY: 3891 case ISTATE_SEND_TEXTRSP: 3892 case ISTATE_SEND_TASKMGTRSP: 3893 case ISTATE_SEND_REJECT: 3894 spin_lock_bh(&cmd->istate_lock); 3895 cmd->i_state = ISTATE_SENT_STATUS; 3896 spin_unlock_bh(&cmd->istate_lock); 3897 break; 3898 default: 3899 pr_err("Unknown Opcode: 0x%02x ITT:" 3900 " 0x%08x, i_state: %d on CID: %hu\n", 3901 cmd->iscsi_opcode, cmd->init_task_tag, 3902 cmd->i_state, conn->cid); 3903 goto err; 3904 } 3905 3906 if (atomic_read(&conn->check_immediate_queue)) 3907 return 1; 3908 3909 return 0; 3910 3911 err: 3912 return -1; 3913 restart: 3914 return -EAGAIN; 3915 } 3916 3917 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3918 { 3919 struct iscsit_transport *t = conn->conn_transport; 3920 struct iscsi_queue_req *qr; 3921 struct iscsi_cmd *cmd; 3922 u8 state; 3923 int ret; 3924 3925 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3926 cmd = qr->cmd; 3927 state = qr->state; 3928 kmem_cache_free(lio_qr_cache, qr); 3929 3930 ret = t->iscsit_response_queue(conn, cmd, state); 3931 if (ret == 1 || ret < 0) 3932 return ret; 3933 } 3934 3935 return 0; 3936 } 3937 3938 int iscsi_target_tx_thread(void *arg) 3939 { 3940 int ret = 0; 3941 struct iscsi_conn *conn; 3942 struct iscsi_thread_set *ts = arg; 3943 /* 3944 * Allow ourselves to be interrupted by SIGINT so that a 3945 * connection recovery / failure event can be triggered externally. 3946 */ 3947 allow_signal(SIGINT); 3948 3949 restart: 3950 conn = iscsi_tx_thread_pre_handler(ts); 3951 if (!conn) 3952 goto out; 3953 3954 ret = 0; 3955 3956 while (!kthread_should_stop()) { 3957 /* 3958 * Ensure that both TX and RX per connection kthreads 3959 * are scheduled to run on the same CPU. 3960 */ 3961 iscsit_thread_check_cpumask(conn, current, 1); 3962 3963 wait_event_interruptible(conn->queues_wq, 3964 !iscsit_conn_all_queues_empty(conn) || 3965 ts->status == ISCSI_THREAD_SET_RESET); 3966 3967 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3968 signal_pending(current)) 3969 goto transport_err; 3970 3971 get_immediate: 3972 ret = iscsit_handle_immediate_queue(conn); 3973 if (ret < 0) 3974 goto transport_err; 3975 3976 ret = iscsit_handle_response_queue(conn); 3977 if (ret == 1) 3978 goto get_immediate; 3979 else if (ret == -EAGAIN) 3980 goto restart; 3981 else if (ret < 0) 3982 goto transport_err; 3983 } 3984 3985 transport_err: 3986 iscsit_take_action_for_connection_exit(conn); 3987 goto restart; 3988 out: 3989 return 0; 3990 } 3991 3992 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3993 { 3994 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3995 struct iscsi_cmd *cmd; 3996 int ret = 0; 3997 3998 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3999 case ISCSI_OP_SCSI_CMD: 4000 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4001 if (!cmd) 4002 goto reject; 4003 4004 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 4005 break; 4006 case ISCSI_OP_SCSI_DATA_OUT: 4007 ret = iscsit_handle_data_out(conn, buf); 4008 break; 4009 case ISCSI_OP_NOOP_OUT: 4010 cmd = NULL; 4011 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 4012 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4013 if (!cmd) 4014 goto reject; 4015 } 4016 ret = iscsit_handle_nop_out(conn, cmd, buf); 4017 break; 4018 case ISCSI_OP_SCSI_TMFUNC: 4019 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4020 if (!cmd) 4021 goto reject; 4022 4023 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 4024 break; 4025 case ISCSI_OP_TEXT: 4026 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4027 if (!cmd) 4028 goto reject; 4029 4030 ret = iscsit_handle_text_cmd(conn, cmd, buf); 4031 break; 4032 case ISCSI_OP_LOGOUT: 4033 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4034 if (!cmd) 4035 goto reject; 4036 4037 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4038 if (ret > 0) 4039 wait_for_completion_timeout(&conn->conn_logout_comp, 4040 SECONDS_FOR_LOGOUT_COMP * HZ); 4041 break; 4042 case ISCSI_OP_SNACK: 4043 ret = iscsit_handle_snack(conn, buf); 4044 break; 4045 default: 4046 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4047 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4048 pr_err("Cannot recover from unknown" 4049 " opcode while ERL=0, closing iSCSI connection.\n"); 4050 return -1; 4051 } 4052 if (!conn->conn_ops->OFMarker) { 4053 pr_err("Unable to recover from unknown" 4054 " opcode while OFMarker=No, closing iSCSI" 4055 " connection.\n"); 4056 return -1; 4057 } 4058 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 4059 pr_err("Unable to recover from unknown" 4060 " opcode, closing iSCSI connection.\n"); 4061 return -1; 4062 } 4063 break; 4064 } 4065 4066 return ret; 4067 reject: 4068 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4069 } 4070 4071 int iscsi_target_rx_thread(void *arg) 4072 { 4073 int ret; 4074 u8 buffer[ISCSI_HDR_LEN], opcode; 4075 u32 checksum = 0, digest = 0; 4076 struct iscsi_conn *conn = NULL; 4077 struct iscsi_thread_set *ts = arg; 4078 struct kvec iov; 4079 /* 4080 * Allow ourselves to be interrupted by SIGINT so that a 4081 * connection recovery / failure event can be triggered externally. 4082 */ 4083 allow_signal(SIGINT); 4084 4085 restart: 4086 conn = iscsi_rx_thread_pre_handler(ts); 4087 if (!conn) 4088 goto out; 4089 4090 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4091 struct completion comp; 4092 int rc; 4093 4094 init_completion(&comp); 4095 rc = wait_for_completion_interruptible(&comp); 4096 if (rc < 0) 4097 goto transport_err; 4098 4099 goto out; 4100 } 4101 4102 while (!kthread_should_stop()) { 4103 /* 4104 * Ensure that both TX and RX per connection kthreads 4105 * are scheduled to run on the same CPU. 4106 */ 4107 iscsit_thread_check_cpumask(conn, current, 0); 4108 4109 memset(buffer, 0, ISCSI_HDR_LEN); 4110 memset(&iov, 0, sizeof(struct kvec)); 4111 4112 iov.iov_base = buffer; 4113 iov.iov_len = ISCSI_HDR_LEN; 4114 4115 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4116 if (ret != ISCSI_HDR_LEN) { 4117 iscsit_rx_thread_wait_for_tcp(conn); 4118 goto transport_err; 4119 } 4120 4121 if (conn->conn_ops->HeaderDigest) { 4122 iov.iov_base = &digest; 4123 iov.iov_len = ISCSI_CRC_LEN; 4124 4125 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4126 if (ret != ISCSI_CRC_LEN) { 4127 iscsit_rx_thread_wait_for_tcp(conn); 4128 goto transport_err; 4129 } 4130 4131 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4132 buffer, ISCSI_HDR_LEN, 4133 0, NULL, (u8 *)&checksum); 4134 4135 if (digest != checksum) { 4136 pr_err("HeaderDigest CRC32C failed," 4137 " received 0x%08x, computed 0x%08x\n", 4138 digest, checksum); 4139 /* 4140 * Set the PDU to 0xff so it will intentionally 4141 * hit default in the switch below. 4142 */ 4143 memset(buffer, 0xff, ISCSI_HDR_LEN); 4144 atomic_long_inc(&conn->sess->conn_digest_errors); 4145 } else { 4146 pr_debug("Got HeaderDigest CRC32C" 4147 " 0x%08x\n", checksum); 4148 } 4149 } 4150 4151 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4152 goto transport_err; 4153 4154 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4155 4156 if (conn->sess->sess_ops->SessionType && 4157 ((!(opcode & ISCSI_OP_TEXT)) || 4158 (!(opcode & ISCSI_OP_LOGOUT)))) { 4159 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4160 " while in Discovery Session, rejecting.\n", opcode); 4161 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4162 buffer); 4163 goto transport_err; 4164 } 4165 4166 ret = iscsi_target_rx_opcode(conn, buffer); 4167 if (ret < 0) 4168 goto transport_err; 4169 } 4170 4171 transport_err: 4172 if (!signal_pending(current)) 4173 atomic_set(&conn->transport_failed, 1); 4174 iscsit_take_action_for_connection_exit(conn); 4175 goto restart; 4176 out: 4177 return 0; 4178 } 4179 4180 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4181 { 4182 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4183 struct iscsi_session *sess = conn->sess; 4184 /* 4185 * We expect this function to only ever be called from either RX or TX 4186 * thread context via iscsit_close_connection() once the other context 4187 * has been reset -> returned sleeping pre-handler state. 4188 */ 4189 spin_lock_bh(&conn->cmd_lock); 4190 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4191 4192 list_del_init(&cmd->i_conn_node); 4193 spin_unlock_bh(&conn->cmd_lock); 4194 4195 iscsit_increment_maxcmdsn(cmd, sess); 4196 4197 iscsit_free_cmd(cmd, true); 4198 4199 spin_lock_bh(&conn->cmd_lock); 4200 } 4201 spin_unlock_bh(&conn->cmd_lock); 4202 } 4203 4204 static void iscsit_stop_timers_for_cmds( 4205 struct iscsi_conn *conn) 4206 { 4207 struct iscsi_cmd *cmd; 4208 4209 spin_lock_bh(&conn->cmd_lock); 4210 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4211 if (cmd->data_direction == DMA_TO_DEVICE) 4212 iscsit_stop_dataout_timer(cmd); 4213 } 4214 spin_unlock_bh(&conn->cmd_lock); 4215 } 4216 4217 int iscsit_close_connection( 4218 struct iscsi_conn *conn) 4219 { 4220 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4221 struct iscsi_session *sess = conn->sess; 4222 4223 pr_debug("Closing iSCSI connection CID %hu on SID:" 4224 " %u\n", conn->cid, sess->sid); 4225 /* 4226 * Always up conn_logout_comp just in case the RX Thread is sleeping 4227 * and the logout response never got sent because the connection 4228 * failed. 4229 */ 4230 complete(&conn->conn_logout_comp); 4231 4232 iscsi_release_thread_set(conn); 4233 4234 iscsit_stop_timers_for_cmds(conn); 4235 iscsit_stop_nopin_response_timer(conn); 4236 iscsit_stop_nopin_timer(conn); 4237 4238 if (conn->conn_transport->iscsit_wait_conn) 4239 conn->conn_transport->iscsit_wait_conn(conn); 4240 4241 /* 4242 * During Connection recovery drop unacknowledged out of order 4243 * commands for this connection, and prepare the other commands 4244 * for realligence. 4245 * 4246 * During normal operation clear the out of order commands (but 4247 * do not free the struct iscsi_ooo_cmdsn's) and release all 4248 * struct iscsi_cmds. 4249 */ 4250 if (atomic_read(&conn->connection_recovery)) { 4251 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4252 iscsit_prepare_cmds_for_realligance(conn); 4253 } else { 4254 iscsit_clear_ooo_cmdsns_for_conn(conn); 4255 iscsit_release_commands_from_conn(conn); 4256 } 4257 iscsit_free_queue_reqs_for_conn(conn); 4258 4259 /* 4260 * Handle decrementing session or connection usage count if 4261 * a logout response was not able to be sent because the 4262 * connection failed. Fall back to Session Recovery here. 4263 */ 4264 if (atomic_read(&conn->conn_logout_remove)) { 4265 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4266 iscsit_dec_conn_usage_count(conn); 4267 iscsit_dec_session_usage_count(sess); 4268 } 4269 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4270 iscsit_dec_conn_usage_count(conn); 4271 4272 atomic_set(&conn->conn_logout_remove, 0); 4273 atomic_set(&sess->session_reinstatement, 0); 4274 atomic_set(&sess->session_fall_back_to_erl0, 1); 4275 } 4276 4277 spin_lock_bh(&sess->conn_lock); 4278 list_del(&conn->conn_list); 4279 4280 /* 4281 * Attempt to let the Initiator know this connection failed by 4282 * sending an Connection Dropped Async Message on another 4283 * active connection. 4284 */ 4285 if (atomic_read(&conn->connection_recovery)) 4286 iscsit_build_conn_drop_async_message(conn); 4287 4288 spin_unlock_bh(&sess->conn_lock); 4289 4290 /* 4291 * If connection reinstatement is being performed on this connection, 4292 * up the connection reinstatement semaphore that is being blocked on 4293 * in iscsit_cause_connection_reinstatement(). 4294 */ 4295 spin_lock_bh(&conn->state_lock); 4296 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4297 spin_unlock_bh(&conn->state_lock); 4298 complete(&conn->conn_wait_comp); 4299 wait_for_completion(&conn->conn_post_wait_comp); 4300 spin_lock_bh(&conn->state_lock); 4301 } 4302 4303 /* 4304 * If connection reinstatement is being performed on this connection 4305 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4306 * connection wait rcfr semaphore that is being blocked on 4307 * an iscsit_connection_reinstatement_rcfr(). 4308 */ 4309 if (atomic_read(&conn->connection_wait_rcfr)) { 4310 spin_unlock_bh(&conn->state_lock); 4311 complete(&conn->conn_wait_rcfr_comp); 4312 wait_for_completion(&conn->conn_post_wait_comp); 4313 spin_lock_bh(&conn->state_lock); 4314 } 4315 atomic_set(&conn->connection_reinstatement, 1); 4316 spin_unlock_bh(&conn->state_lock); 4317 4318 /* 4319 * If any other processes are accessing this connection pointer we 4320 * must wait until they have completed. 4321 */ 4322 iscsit_check_conn_usage_count(conn); 4323 4324 if (conn->conn_rx_hash.tfm) 4325 crypto_free_hash(conn->conn_rx_hash.tfm); 4326 if (conn->conn_tx_hash.tfm) 4327 crypto_free_hash(conn->conn_tx_hash.tfm); 4328 4329 if (conn->conn_cpumask) 4330 free_cpumask_var(conn->conn_cpumask); 4331 4332 kfree(conn->conn_ops); 4333 conn->conn_ops = NULL; 4334 4335 if (conn->sock) 4336 sock_release(conn->sock); 4337 4338 if (conn->conn_transport->iscsit_free_conn) 4339 conn->conn_transport->iscsit_free_conn(conn); 4340 4341 iscsit_put_transport(conn->conn_transport); 4342 4343 conn->thread_set = NULL; 4344 4345 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4346 conn->conn_state = TARG_CONN_STATE_FREE; 4347 kfree(conn); 4348 4349 spin_lock_bh(&sess->conn_lock); 4350 atomic_dec(&sess->nconn); 4351 pr_debug("Decremented iSCSI connection count to %hu from node:" 4352 " %s\n", atomic_read(&sess->nconn), 4353 sess->sess_ops->InitiatorName); 4354 /* 4355 * Make sure that if one connection fails in an non ERL=2 iSCSI 4356 * Session that they all fail. 4357 */ 4358 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4359 !atomic_read(&sess->session_logout)) 4360 atomic_set(&sess->session_fall_back_to_erl0, 1); 4361 4362 /* 4363 * If this was not the last connection in the session, and we are 4364 * performing session reinstatement or falling back to ERL=0, call 4365 * iscsit_stop_session() without sleeping to shutdown the other 4366 * active connections. 4367 */ 4368 if (atomic_read(&sess->nconn)) { 4369 if (!atomic_read(&sess->session_reinstatement) && 4370 !atomic_read(&sess->session_fall_back_to_erl0)) { 4371 spin_unlock_bh(&sess->conn_lock); 4372 return 0; 4373 } 4374 if (!atomic_read(&sess->session_stop_active)) { 4375 atomic_set(&sess->session_stop_active, 1); 4376 spin_unlock_bh(&sess->conn_lock); 4377 iscsit_stop_session(sess, 0, 0); 4378 return 0; 4379 } 4380 spin_unlock_bh(&sess->conn_lock); 4381 return 0; 4382 } 4383 4384 /* 4385 * If this was the last connection in the session and one of the 4386 * following is occurring: 4387 * 4388 * Session Reinstatement is not being performed, and are falling back 4389 * to ERL=0 call iscsit_close_session(). 4390 * 4391 * Session Logout was requested. iscsit_close_session() will be called 4392 * elsewhere. 4393 * 4394 * Session Continuation is not being performed, start the Time2Retain 4395 * handler and check if sleep_on_sess_wait_sem is active. 4396 */ 4397 if (!atomic_read(&sess->session_reinstatement) && 4398 atomic_read(&sess->session_fall_back_to_erl0)) { 4399 spin_unlock_bh(&sess->conn_lock); 4400 target_put_session(sess->se_sess); 4401 4402 return 0; 4403 } else if (atomic_read(&sess->session_logout)) { 4404 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4405 sess->session_state = TARG_SESS_STATE_FREE; 4406 spin_unlock_bh(&sess->conn_lock); 4407 4408 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4409 complete(&sess->session_wait_comp); 4410 4411 return 0; 4412 } else { 4413 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4414 sess->session_state = TARG_SESS_STATE_FAILED; 4415 4416 if (!atomic_read(&sess->session_continuation)) { 4417 spin_unlock_bh(&sess->conn_lock); 4418 iscsit_start_time2retain_handler(sess); 4419 } else 4420 spin_unlock_bh(&sess->conn_lock); 4421 4422 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4423 complete(&sess->session_wait_comp); 4424 4425 return 0; 4426 } 4427 spin_unlock_bh(&sess->conn_lock); 4428 4429 return 0; 4430 } 4431 4432 int iscsit_close_session(struct iscsi_session *sess) 4433 { 4434 struct iscsi_portal_group *tpg = sess->tpg; 4435 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4436 4437 if (atomic_read(&sess->nconn)) { 4438 pr_err("%d connection(s) still exist for iSCSI session" 4439 " to %s\n", atomic_read(&sess->nconn), 4440 sess->sess_ops->InitiatorName); 4441 BUG(); 4442 } 4443 4444 spin_lock_bh(&se_tpg->session_lock); 4445 atomic_set(&sess->session_logout, 1); 4446 atomic_set(&sess->session_reinstatement, 1); 4447 iscsit_stop_time2retain_timer(sess); 4448 spin_unlock_bh(&se_tpg->session_lock); 4449 4450 /* 4451 * transport_deregister_session_configfs() will clear the 4452 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4453 * can be setting it again with __transport_register_session() in 4454 * iscsi_post_login_handler() again after the iscsit_stop_session() 4455 * completes in iscsi_np context. 4456 */ 4457 transport_deregister_session_configfs(sess->se_sess); 4458 4459 /* 4460 * If any other processes are accessing this session pointer we must 4461 * wait until they have completed. If we are in an interrupt (the 4462 * time2retain handler) and contain and active session usage count we 4463 * restart the timer and exit. 4464 */ 4465 if (!in_interrupt()) { 4466 if (iscsit_check_session_usage_count(sess) == 1) 4467 iscsit_stop_session(sess, 1, 1); 4468 } else { 4469 if (iscsit_check_session_usage_count(sess) == 2) { 4470 atomic_set(&sess->session_logout, 0); 4471 iscsit_start_time2retain_handler(sess); 4472 return 0; 4473 } 4474 } 4475 4476 transport_deregister_session(sess->se_sess); 4477 4478 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4479 iscsit_free_connection_recovery_entires(sess); 4480 4481 iscsit_free_all_ooo_cmdsns(sess); 4482 4483 spin_lock_bh(&se_tpg->session_lock); 4484 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4485 sess->session_state = TARG_SESS_STATE_FREE; 4486 pr_debug("Released iSCSI session from node: %s\n", 4487 sess->sess_ops->InitiatorName); 4488 tpg->nsessions--; 4489 if (tpg->tpg_tiqn) 4490 tpg->tpg_tiqn->tiqn_nsessions--; 4491 4492 pr_debug("Decremented number of active iSCSI Sessions on" 4493 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4494 4495 spin_lock(&sess_idr_lock); 4496 idr_remove(&sess_idr, sess->session_index); 4497 spin_unlock(&sess_idr_lock); 4498 4499 kfree(sess->sess_ops); 4500 sess->sess_ops = NULL; 4501 spin_unlock_bh(&se_tpg->session_lock); 4502 4503 kfree(sess); 4504 return 0; 4505 } 4506 4507 static void iscsit_logout_post_handler_closesession( 4508 struct iscsi_conn *conn) 4509 { 4510 struct iscsi_session *sess = conn->sess; 4511 4512 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4513 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4514 4515 atomic_set(&conn->conn_logout_remove, 0); 4516 complete(&conn->conn_logout_comp); 4517 4518 iscsit_dec_conn_usage_count(conn); 4519 iscsit_stop_session(sess, 1, 1); 4520 iscsit_dec_session_usage_count(sess); 4521 target_put_session(sess->se_sess); 4522 } 4523 4524 static void iscsit_logout_post_handler_samecid( 4525 struct iscsi_conn *conn) 4526 { 4527 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4528 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4529 4530 atomic_set(&conn->conn_logout_remove, 0); 4531 complete(&conn->conn_logout_comp); 4532 4533 iscsit_cause_connection_reinstatement(conn, 1); 4534 iscsit_dec_conn_usage_count(conn); 4535 } 4536 4537 static void iscsit_logout_post_handler_diffcid( 4538 struct iscsi_conn *conn, 4539 u16 cid) 4540 { 4541 struct iscsi_conn *l_conn; 4542 struct iscsi_session *sess = conn->sess; 4543 4544 if (!sess) 4545 return; 4546 4547 spin_lock_bh(&sess->conn_lock); 4548 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4549 if (l_conn->cid == cid) { 4550 iscsit_inc_conn_usage_count(l_conn); 4551 break; 4552 } 4553 } 4554 spin_unlock_bh(&sess->conn_lock); 4555 4556 if (!l_conn) 4557 return; 4558 4559 if (l_conn->sock) 4560 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4561 4562 spin_lock_bh(&l_conn->state_lock); 4563 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4564 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4565 spin_unlock_bh(&l_conn->state_lock); 4566 4567 iscsit_cause_connection_reinstatement(l_conn, 1); 4568 iscsit_dec_conn_usage_count(l_conn); 4569 } 4570 4571 /* 4572 * Return of 0 causes the TX thread to restart. 4573 */ 4574 int iscsit_logout_post_handler( 4575 struct iscsi_cmd *cmd, 4576 struct iscsi_conn *conn) 4577 { 4578 int ret = 0; 4579 4580 switch (cmd->logout_reason) { 4581 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4582 switch (cmd->logout_response) { 4583 case ISCSI_LOGOUT_SUCCESS: 4584 case ISCSI_LOGOUT_CLEANUP_FAILED: 4585 default: 4586 iscsit_logout_post_handler_closesession(conn); 4587 break; 4588 } 4589 ret = 0; 4590 break; 4591 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4592 if (conn->cid == cmd->logout_cid) { 4593 switch (cmd->logout_response) { 4594 case ISCSI_LOGOUT_SUCCESS: 4595 case ISCSI_LOGOUT_CLEANUP_FAILED: 4596 default: 4597 iscsit_logout_post_handler_samecid(conn); 4598 break; 4599 } 4600 ret = 0; 4601 } else { 4602 switch (cmd->logout_response) { 4603 case ISCSI_LOGOUT_SUCCESS: 4604 iscsit_logout_post_handler_diffcid(conn, 4605 cmd->logout_cid); 4606 break; 4607 case ISCSI_LOGOUT_CID_NOT_FOUND: 4608 case ISCSI_LOGOUT_CLEANUP_FAILED: 4609 default: 4610 break; 4611 } 4612 ret = 1; 4613 } 4614 break; 4615 case ISCSI_LOGOUT_REASON_RECOVERY: 4616 switch (cmd->logout_response) { 4617 case ISCSI_LOGOUT_SUCCESS: 4618 case ISCSI_LOGOUT_CID_NOT_FOUND: 4619 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4620 case ISCSI_LOGOUT_CLEANUP_FAILED: 4621 default: 4622 break; 4623 } 4624 ret = 1; 4625 break; 4626 default: 4627 break; 4628 4629 } 4630 return ret; 4631 } 4632 EXPORT_SYMBOL(iscsit_logout_post_handler); 4633 4634 void iscsit_fail_session(struct iscsi_session *sess) 4635 { 4636 struct iscsi_conn *conn; 4637 4638 spin_lock_bh(&sess->conn_lock); 4639 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4640 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4641 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4642 } 4643 spin_unlock_bh(&sess->conn_lock); 4644 4645 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4646 sess->session_state = TARG_SESS_STATE_FAILED; 4647 } 4648 4649 int iscsit_free_session(struct iscsi_session *sess) 4650 { 4651 u16 conn_count = atomic_read(&sess->nconn); 4652 struct iscsi_conn *conn, *conn_tmp = NULL; 4653 int is_last; 4654 4655 spin_lock_bh(&sess->conn_lock); 4656 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4657 4658 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4659 conn_list) { 4660 if (conn_count == 0) 4661 break; 4662 4663 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4664 is_last = 1; 4665 } else { 4666 iscsit_inc_conn_usage_count(conn_tmp); 4667 is_last = 0; 4668 } 4669 iscsit_inc_conn_usage_count(conn); 4670 4671 spin_unlock_bh(&sess->conn_lock); 4672 iscsit_cause_connection_reinstatement(conn, 1); 4673 spin_lock_bh(&sess->conn_lock); 4674 4675 iscsit_dec_conn_usage_count(conn); 4676 if (is_last == 0) 4677 iscsit_dec_conn_usage_count(conn_tmp); 4678 4679 conn_count--; 4680 } 4681 4682 if (atomic_read(&sess->nconn)) { 4683 spin_unlock_bh(&sess->conn_lock); 4684 wait_for_completion(&sess->session_wait_comp); 4685 } else 4686 spin_unlock_bh(&sess->conn_lock); 4687 4688 target_put_session(sess->se_sess); 4689 return 0; 4690 } 4691 4692 void iscsit_stop_session( 4693 struct iscsi_session *sess, 4694 int session_sleep, 4695 int connection_sleep) 4696 { 4697 u16 conn_count = atomic_read(&sess->nconn); 4698 struct iscsi_conn *conn, *conn_tmp = NULL; 4699 int is_last; 4700 4701 spin_lock_bh(&sess->conn_lock); 4702 if (session_sleep) 4703 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4704 4705 if (connection_sleep) { 4706 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4707 conn_list) { 4708 if (conn_count == 0) 4709 break; 4710 4711 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4712 is_last = 1; 4713 } else { 4714 iscsit_inc_conn_usage_count(conn_tmp); 4715 is_last = 0; 4716 } 4717 iscsit_inc_conn_usage_count(conn); 4718 4719 spin_unlock_bh(&sess->conn_lock); 4720 iscsit_cause_connection_reinstatement(conn, 1); 4721 spin_lock_bh(&sess->conn_lock); 4722 4723 iscsit_dec_conn_usage_count(conn); 4724 if (is_last == 0) 4725 iscsit_dec_conn_usage_count(conn_tmp); 4726 conn_count--; 4727 } 4728 } else { 4729 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4730 iscsit_cause_connection_reinstatement(conn, 0); 4731 } 4732 4733 if (session_sleep && atomic_read(&sess->nconn)) { 4734 spin_unlock_bh(&sess->conn_lock); 4735 wait_for_completion(&sess->session_wait_comp); 4736 } else 4737 spin_unlock_bh(&sess->conn_lock); 4738 } 4739 4740 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4741 { 4742 struct iscsi_session *sess; 4743 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4744 struct se_session *se_sess, *se_sess_tmp; 4745 int session_count = 0; 4746 4747 spin_lock_bh(&se_tpg->session_lock); 4748 if (tpg->nsessions && !force) { 4749 spin_unlock_bh(&se_tpg->session_lock); 4750 return -1; 4751 } 4752 4753 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4754 sess_list) { 4755 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4756 4757 spin_lock(&sess->conn_lock); 4758 if (atomic_read(&sess->session_fall_back_to_erl0) || 4759 atomic_read(&sess->session_logout) || 4760 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4761 spin_unlock(&sess->conn_lock); 4762 continue; 4763 } 4764 atomic_set(&sess->session_reinstatement, 1); 4765 spin_unlock(&sess->conn_lock); 4766 spin_unlock_bh(&se_tpg->session_lock); 4767 4768 iscsit_free_session(sess); 4769 spin_lock_bh(&se_tpg->session_lock); 4770 4771 session_count++; 4772 } 4773 spin_unlock_bh(&se_tpg->session_lock); 4774 4775 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4776 " Group: %hu\n", session_count, tpg->tpgt); 4777 return 0; 4778 } 4779 4780 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4781 MODULE_VERSION("4.1.x"); 4782 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4783 MODULE_LICENSE("GPL"); 4784 4785 module_init(iscsi_target_init_module); 4786 module_exit(iscsi_target_cleanup_module); 4787