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_SPINLOCK(np_lock); 56 57 static struct idr tiqn_idr; 58 struct idr sess_idr; 59 struct mutex auth_id_lock; 60 spinlock_t sess_idr_lock; 61 62 struct iscsit_global *iscsit_global; 63 64 struct kmem_cache *lio_qr_cache; 65 struct kmem_cache *lio_dr_cache; 66 struct kmem_cache *lio_ooo_cache; 67 struct kmem_cache *lio_r2t_cache; 68 69 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 70 struct iscsi_scsi_req *, u32); 71 72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 73 { 74 struct iscsi_tiqn *tiqn = NULL; 75 76 spin_lock(&tiqn_lock); 77 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 78 if (!strcmp(tiqn->tiqn, buf)) { 79 80 spin_lock(&tiqn->tiqn_state_lock); 81 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 82 tiqn->tiqn_access_count++; 83 spin_unlock(&tiqn->tiqn_state_lock); 84 spin_unlock(&tiqn_lock); 85 return tiqn; 86 } 87 spin_unlock(&tiqn->tiqn_state_lock); 88 } 89 } 90 spin_unlock(&tiqn_lock); 91 92 return NULL; 93 } 94 95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 96 { 97 spin_lock(&tiqn->tiqn_state_lock); 98 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 99 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 100 spin_unlock(&tiqn->tiqn_state_lock); 101 return 0; 102 } 103 spin_unlock(&tiqn->tiqn_state_lock); 104 105 return -1; 106 } 107 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 109 { 110 spin_lock(&tiqn->tiqn_state_lock); 111 tiqn->tiqn_access_count--; 112 spin_unlock(&tiqn->tiqn_state_lock); 113 } 114 115 /* 116 * Note that IQN formatting is expected to be done in userspace, and 117 * no explict IQN format checks are done here. 118 */ 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 120 { 121 struct iscsi_tiqn *tiqn = NULL; 122 int ret; 123 124 if (strlen(buf) >= ISCSI_IQN_LEN) { 125 pr_err("Target IQN exceeds %d bytes\n", 126 ISCSI_IQN_LEN); 127 return ERR_PTR(-EINVAL); 128 } 129 130 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 131 if (!tiqn) { 132 pr_err("Unable to allocate struct iscsi_tiqn\n"); 133 return ERR_PTR(-ENOMEM); 134 } 135 136 sprintf(tiqn->tiqn, "%s", buf); 137 INIT_LIST_HEAD(&tiqn->tiqn_list); 138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 139 spin_lock_init(&tiqn->tiqn_state_lock); 140 spin_lock_init(&tiqn->tiqn_tpg_lock); 141 spin_lock_init(&tiqn->sess_err_stats.lock); 142 spin_lock_init(&tiqn->login_stats.lock); 143 spin_lock_init(&tiqn->logout_stats.lock); 144 145 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 146 147 idr_preload(GFP_KERNEL); 148 spin_lock(&tiqn_lock); 149 150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 151 if (ret < 0) { 152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 153 spin_unlock(&tiqn_lock); 154 idr_preload_end(); 155 kfree(tiqn); 156 return ERR_PTR(ret); 157 } 158 tiqn->tiqn_index = ret; 159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 160 161 spin_unlock(&tiqn_lock); 162 idr_preload_end(); 163 164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 165 166 return tiqn; 167 168 } 169 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 171 { 172 /* 173 * Wait for accesses to said struct iscsi_tiqn to end. 174 */ 175 spin_lock(&tiqn->tiqn_state_lock); 176 while (tiqn->tiqn_access_count != 0) { 177 spin_unlock(&tiqn->tiqn_state_lock); 178 msleep(10); 179 spin_lock(&tiqn->tiqn_state_lock); 180 } 181 spin_unlock(&tiqn->tiqn_state_lock); 182 } 183 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 185 { 186 /* 187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 188 * while holding tiqn->tiqn_state_lock. This means that all subsequent 189 * attempts to access this struct iscsi_tiqn will fail from both transport 190 * fabric and control code paths. 191 */ 192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 193 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 194 return; 195 } 196 197 iscsit_wait_for_tiqn(tiqn); 198 199 spin_lock(&tiqn_lock); 200 list_del(&tiqn->tiqn_list); 201 idr_remove(&tiqn_idr, tiqn->tiqn_index); 202 spin_unlock(&tiqn_lock); 203 204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 205 tiqn->tiqn); 206 kfree(tiqn); 207 } 208 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 210 { 211 int ret; 212 /* 213 * Determine if the network portal is accepting storage traffic. 214 */ 215 spin_lock_bh(&np->np_thread_lock); 216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 217 spin_unlock_bh(&np->np_thread_lock); 218 return -1; 219 } 220 spin_unlock_bh(&np->np_thread_lock); 221 /* 222 * Determine if the portal group is accepting storage traffic. 223 */ 224 spin_lock_bh(&tpg->tpg_state_lock); 225 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 226 spin_unlock_bh(&tpg->tpg_state_lock); 227 return -1; 228 } 229 spin_unlock_bh(&tpg->tpg_state_lock); 230 231 /* 232 * Here we serialize access across the TIQN+TPG Tuple. 233 */ 234 ret = down_interruptible(&tpg->np_login_sem); 235 if ((ret != 0) || signal_pending(current)) 236 return -1; 237 238 spin_lock_bh(&tpg->tpg_state_lock); 239 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 240 spin_unlock_bh(&tpg->tpg_state_lock); 241 up(&tpg->np_login_sem); 242 return -1; 243 } 244 spin_unlock_bh(&tpg->tpg_state_lock); 245 246 return 0; 247 } 248 249 void iscsit_login_kref_put(struct kref *kref) 250 { 251 struct iscsi_tpg_np *tpg_np = container_of(kref, 252 struct iscsi_tpg_np, tpg_np_kref); 253 254 complete(&tpg_np->tpg_np_comp); 255 } 256 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 258 struct iscsi_tpg_np *tpg_np) 259 { 260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 261 262 up(&tpg->np_login_sem); 263 264 if (tpg_np) 265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 266 267 if (tiqn) 268 iscsit_put_tiqn_for_login(tiqn); 269 270 return 0; 271 } 272 273 bool iscsit_check_np_match( 274 struct __kernel_sockaddr_storage *sockaddr, 275 struct iscsi_np *np, 276 int network_transport) 277 { 278 struct sockaddr_in *sock_in, *sock_in_e; 279 struct sockaddr_in6 *sock_in6, *sock_in6_e; 280 bool ip_match = false; 281 u16 port; 282 283 if (sockaddr->ss_family == AF_INET6) { 284 sock_in6 = (struct sockaddr_in6 *)sockaddr; 285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 286 287 if (!memcmp(&sock_in6->sin6_addr.in6_u, 288 &sock_in6_e->sin6_addr.in6_u, 289 sizeof(struct in6_addr))) 290 ip_match = true; 291 292 port = ntohs(sock_in6->sin6_port); 293 } else { 294 sock_in = (struct sockaddr_in *)sockaddr; 295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 296 297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 298 ip_match = true; 299 300 port = ntohs(sock_in->sin_port); 301 } 302 303 if ((ip_match == true) && (np->np_port == port) && 304 (np->np_network_transport == network_transport)) 305 return true; 306 307 return false; 308 } 309 310 static struct iscsi_np *iscsit_get_np( 311 struct __kernel_sockaddr_storage *sockaddr, 312 int network_transport) 313 { 314 struct iscsi_np *np; 315 bool match; 316 317 spin_lock_bh(&np_lock); 318 list_for_each_entry(np, &g_np_list, np_list) { 319 spin_lock(&np->np_thread_lock); 320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 321 spin_unlock(&np->np_thread_lock); 322 continue; 323 } 324 325 match = iscsit_check_np_match(sockaddr, np, network_transport); 326 if (match == true) { 327 /* 328 * Increment the np_exports reference count now to 329 * prevent iscsit_del_np() below from being called 330 * while iscsi_tpg_add_network_portal() is called. 331 */ 332 np->np_exports++; 333 spin_unlock(&np->np_thread_lock); 334 spin_unlock_bh(&np_lock); 335 return np; 336 } 337 spin_unlock(&np->np_thread_lock); 338 } 339 spin_unlock_bh(&np_lock); 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 * Locate the existing struct iscsi_np if already active.. 355 */ 356 np = iscsit_get_np(sockaddr, network_transport); 357 if (np) 358 return np; 359 360 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 361 if (!np) { 362 pr_err("Unable to allocate memory for struct iscsi_np\n"); 363 return ERR_PTR(-ENOMEM); 364 } 365 366 np->np_flags |= NPF_IP_NETWORK; 367 if (sockaddr->ss_family == AF_INET6) { 368 sock_in6 = (struct sockaddr_in6 *)sockaddr; 369 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 370 np->np_port = ntohs(sock_in6->sin6_port); 371 } else { 372 sock_in = (struct sockaddr_in *)sockaddr; 373 sprintf(np->np_ip, "%s", ip_str); 374 np->np_port = ntohs(sock_in->sin_port); 375 } 376 377 np->np_network_transport = network_transport; 378 spin_lock_init(&np->np_thread_lock); 379 init_completion(&np->np_restart_comp); 380 INIT_LIST_HEAD(&np->np_list); 381 382 ret = iscsi_target_setup_login_socket(np, sockaddr); 383 if (ret != 0) { 384 kfree(np); 385 return ERR_PTR(ret); 386 } 387 388 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 389 if (IS_ERR(np->np_thread)) { 390 pr_err("Unable to create kthread: iscsi_np\n"); 391 ret = PTR_ERR(np->np_thread); 392 kfree(np); 393 return ERR_PTR(ret); 394 } 395 /* 396 * Increment the np_exports reference count now to prevent 397 * iscsit_del_np() below from being run while a new call to 398 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 399 * active. We don't need to hold np->np_thread_lock at this 400 * point because iscsi_np has not been added to g_np_list yet. 401 */ 402 np->np_exports = 1; 403 404 spin_lock_bh(&np_lock); 405 list_add_tail(&np->np_list, &g_np_list); 406 spin_unlock_bh(&np_lock); 407 408 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 409 np->np_ip, np->np_port, np->np_transport->name); 410 411 return np; 412 } 413 414 int iscsit_reset_np_thread( 415 struct iscsi_np *np, 416 struct iscsi_tpg_np *tpg_np, 417 struct iscsi_portal_group *tpg, 418 bool shutdown) 419 { 420 spin_lock_bh(&np->np_thread_lock); 421 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 422 spin_unlock_bh(&np->np_thread_lock); 423 return 0; 424 } 425 np->np_thread_state = ISCSI_NP_THREAD_RESET; 426 427 if (np->np_thread) { 428 spin_unlock_bh(&np->np_thread_lock); 429 send_sig(SIGINT, np->np_thread, 1); 430 wait_for_completion(&np->np_restart_comp); 431 spin_lock_bh(&np->np_thread_lock); 432 } 433 spin_unlock_bh(&np->np_thread_lock); 434 435 if (tpg_np && shutdown) { 436 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 437 438 wait_for_completion(&tpg_np->tpg_np_comp); 439 } 440 441 return 0; 442 } 443 444 static void iscsit_free_np(struct iscsi_np *np) 445 { 446 if (np->np_socket) 447 sock_release(np->np_socket); 448 } 449 450 int iscsit_del_np(struct iscsi_np *np) 451 { 452 spin_lock_bh(&np->np_thread_lock); 453 np->np_exports--; 454 if (np->np_exports) { 455 spin_unlock_bh(&np->np_thread_lock); 456 return 0; 457 } 458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 459 spin_unlock_bh(&np->np_thread_lock); 460 461 if (np->np_thread) { 462 /* 463 * We need to send the signal to wakeup Linux/Net 464 * which may be sleeping in sock_accept().. 465 */ 466 send_sig(SIGINT, np->np_thread, 1); 467 kthread_stop(np->np_thread); 468 } 469 470 np->np_transport->iscsit_free_np(np); 471 472 spin_lock_bh(&np_lock); 473 list_del(&np->np_list); 474 spin_unlock_bh(&np_lock); 475 476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 477 np->np_ip, np->np_port, np->np_transport->name); 478 479 iscsit_put_transport(np->np_transport); 480 kfree(np); 481 return 0; 482 } 483 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 486 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 488 { 489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 490 return 0; 491 } 492 493 static struct iscsit_transport iscsi_target_transport = { 494 .name = "iSCSI/TCP", 495 .transport_type = ISCSI_TCP, 496 .owner = NULL, 497 .iscsit_setup_np = iscsit_setup_np, 498 .iscsit_accept_np = iscsit_accept_np, 499 .iscsit_free_np = iscsit_free_np, 500 .iscsit_get_login_rx = iscsit_get_login_rx, 501 .iscsit_put_login_tx = iscsit_put_login_tx, 502 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 503 .iscsit_immediate_queue = iscsit_immediate_queue, 504 .iscsit_response_queue = iscsit_response_queue, 505 .iscsit_queue_data_in = iscsit_queue_rsp, 506 .iscsit_queue_status = iscsit_queue_rsp, 507 }; 508 509 static int __init iscsi_target_init_module(void) 510 { 511 int ret = 0; 512 513 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 514 515 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 516 if (!iscsit_global) { 517 pr_err("Unable to allocate memory for iscsit_global\n"); 518 return -1; 519 } 520 mutex_init(&auth_id_lock); 521 spin_lock_init(&sess_idr_lock); 522 idr_init(&tiqn_idr); 523 idr_init(&sess_idr); 524 525 ret = iscsi_target_register_configfs(); 526 if (ret < 0) 527 goto out; 528 529 ret = iscsi_thread_set_init(); 530 if (ret < 0) 531 goto configfs_out; 532 533 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 534 TARGET_THREAD_SET_COUNT) { 535 pr_err("iscsi_allocate_thread_sets() returned" 536 " unexpected value!\n"); 537 goto ts_out1; 538 } 539 540 lio_qr_cache = kmem_cache_create("lio_qr_cache", 541 sizeof(struct iscsi_queue_req), 542 __alignof__(struct iscsi_queue_req), 0, NULL); 543 if (!lio_qr_cache) { 544 pr_err("nable to kmem_cache_create() for" 545 " lio_qr_cache\n"); 546 goto ts_out2; 547 } 548 549 lio_dr_cache = kmem_cache_create("lio_dr_cache", 550 sizeof(struct iscsi_datain_req), 551 __alignof__(struct iscsi_datain_req), 0, NULL); 552 if (!lio_dr_cache) { 553 pr_err("Unable to kmem_cache_create() for" 554 " lio_dr_cache\n"); 555 goto qr_out; 556 } 557 558 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 559 sizeof(struct iscsi_ooo_cmdsn), 560 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 561 if (!lio_ooo_cache) { 562 pr_err("Unable to kmem_cache_create() for" 563 " lio_ooo_cache\n"); 564 goto dr_out; 565 } 566 567 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 568 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 569 0, NULL); 570 if (!lio_r2t_cache) { 571 pr_err("Unable to kmem_cache_create() for" 572 " lio_r2t_cache\n"); 573 goto ooo_out; 574 } 575 576 iscsit_register_transport(&iscsi_target_transport); 577 578 if (iscsit_load_discovery_tpg() < 0) 579 goto r2t_out; 580 581 return ret; 582 r2t_out: 583 kmem_cache_destroy(lio_r2t_cache); 584 ooo_out: 585 kmem_cache_destroy(lio_ooo_cache); 586 dr_out: 587 kmem_cache_destroy(lio_dr_cache); 588 qr_out: 589 kmem_cache_destroy(lio_qr_cache); 590 ts_out2: 591 iscsi_deallocate_thread_sets(); 592 ts_out1: 593 iscsi_thread_set_free(); 594 configfs_out: 595 iscsi_target_deregister_configfs(); 596 out: 597 kfree(iscsit_global); 598 return -ENOMEM; 599 } 600 601 static void __exit iscsi_target_cleanup_module(void) 602 { 603 iscsi_deallocate_thread_sets(); 604 iscsi_thread_set_free(); 605 iscsit_release_discovery_tpg(); 606 iscsit_unregister_transport(&iscsi_target_transport); 607 kmem_cache_destroy(lio_qr_cache); 608 kmem_cache_destroy(lio_dr_cache); 609 kmem_cache_destroy(lio_ooo_cache); 610 kmem_cache_destroy(lio_r2t_cache); 611 612 iscsi_target_deregister_configfs(); 613 614 kfree(iscsit_global); 615 } 616 617 static int iscsit_add_reject( 618 struct iscsi_conn *conn, 619 u8 reason, 620 unsigned char *buf) 621 { 622 struct iscsi_cmd *cmd; 623 624 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 625 if (!cmd) 626 return -1; 627 628 cmd->iscsi_opcode = ISCSI_OP_REJECT; 629 cmd->reject_reason = reason; 630 631 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 632 if (!cmd->buf_ptr) { 633 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 634 iscsit_free_cmd(cmd, false); 635 return -1; 636 } 637 638 spin_lock_bh(&conn->cmd_lock); 639 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 640 spin_unlock_bh(&conn->cmd_lock); 641 642 cmd->i_state = ISTATE_SEND_REJECT; 643 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 644 645 return -1; 646 } 647 648 static int iscsit_add_reject_from_cmd( 649 struct iscsi_cmd *cmd, 650 u8 reason, 651 bool add_to_conn, 652 unsigned char *buf) 653 { 654 struct iscsi_conn *conn; 655 656 if (!cmd->conn) { 657 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 658 cmd->init_task_tag); 659 return -1; 660 } 661 conn = cmd->conn; 662 663 cmd->iscsi_opcode = ISCSI_OP_REJECT; 664 cmd->reject_reason = reason; 665 666 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 667 if (!cmd->buf_ptr) { 668 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 669 iscsit_free_cmd(cmd, false); 670 return -1; 671 } 672 673 if (add_to_conn) { 674 spin_lock_bh(&conn->cmd_lock); 675 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 676 spin_unlock_bh(&conn->cmd_lock); 677 } 678 679 cmd->i_state = ISTATE_SEND_REJECT; 680 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 681 /* 682 * Perform the kref_put now if se_cmd has already been setup by 683 * scsit_setup_scsi_cmd() 684 */ 685 if (cmd->se_cmd.se_tfo != NULL) { 686 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 687 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 688 } 689 return -1; 690 } 691 692 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 693 unsigned char *buf) 694 { 695 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 696 } 697 698 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 699 { 700 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 701 } 702 703 /* 704 * Map some portion of the allocated scatterlist to an iovec, suitable for 705 * kernel sockets to copy data in/out. 706 */ 707 static int iscsit_map_iovec( 708 struct iscsi_cmd *cmd, 709 struct kvec *iov, 710 u32 data_offset, 711 u32 data_length) 712 { 713 u32 i = 0; 714 struct scatterlist *sg; 715 unsigned int page_off; 716 717 /* 718 * We know each entry in t_data_sg contains a page. 719 */ 720 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 721 page_off = (data_offset % PAGE_SIZE); 722 723 cmd->first_data_sg = sg; 724 cmd->first_data_sg_off = page_off; 725 726 while (data_length) { 727 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 728 729 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 730 iov[i].iov_len = cur_len; 731 732 data_length -= cur_len; 733 page_off = 0; 734 sg = sg_next(sg); 735 i++; 736 } 737 738 cmd->kmapped_nents = i; 739 740 return i; 741 } 742 743 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 744 { 745 u32 i; 746 struct scatterlist *sg; 747 748 sg = cmd->first_data_sg; 749 750 for (i = 0; i < cmd->kmapped_nents; i++) 751 kunmap(sg_page(&sg[i])); 752 } 753 754 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 755 { 756 struct iscsi_cmd *cmd; 757 758 conn->exp_statsn = exp_statsn; 759 760 if (conn->sess->sess_ops->RDMAExtensions) 761 return; 762 763 spin_lock_bh(&conn->cmd_lock); 764 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 765 spin_lock(&cmd->istate_lock); 766 if ((cmd->i_state == ISTATE_SENT_STATUS) && 767 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 768 cmd->i_state = ISTATE_REMOVE; 769 spin_unlock(&cmd->istate_lock); 770 iscsit_add_cmd_to_immediate_queue(cmd, conn, 771 cmd->i_state); 772 continue; 773 } 774 spin_unlock(&cmd->istate_lock); 775 } 776 spin_unlock_bh(&conn->cmd_lock); 777 } 778 779 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 780 { 781 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 782 783 iov_count += ISCSI_IOV_DATA_BUFFER; 784 785 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 786 if (!cmd->iov_data) { 787 pr_err("Unable to allocate cmd->iov_data\n"); 788 return -ENOMEM; 789 } 790 791 cmd->orig_iov_data_count = iov_count; 792 return 0; 793 } 794 795 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 796 unsigned char *buf) 797 { 798 int data_direction, payload_length; 799 struct iscsi_scsi_req *hdr; 800 int iscsi_task_attr; 801 int sam_task_attr; 802 803 spin_lock_bh(&conn->sess->session_stats_lock); 804 conn->sess->cmd_pdus++; 805 if (conn->sess->se_sess->se_node_acl) { 806 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 807 conn->sess->se_sess->se_node_acl->num_cmds++; 808 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 809 } 810 spin_unlock_bh(&conn->sess->session_stats_lock); 811 812 hdr = (struct iscsi_scsi_req *) buf; 813 payload_length = ntoh24(hdr->dlength); 814 815 /* FIXME; Add checks for AdditionalHeaderSegment */ 816 817 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 818 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 819 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 820 " not set. Bad iSCSI Initiator.\n"); 821 return iscsit_add_reject_cmd(cmd, 822 ISCSI_REASON_BOOKMARK_INVALID, buf); 823 } 824 825 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 826 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 827 /* 828 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) 829 * that adds support for RESERVE/RELEASE. There is a bug 830 * add with this new functionality that sets R/W bits when 831 * neither CDB carries any READ or WRITE datapayloads. 832 */ 833 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { 834 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 835 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 836 goto done; 837 } 838 839 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 840 " set when Expected Data Transfer Length is 0 for" 841 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); 842 return iscsit_add_reject_cmd(cmd, 843 ISCSI_REASON_BOOKMARK_INVALID, buf); 844 } 845 done: 846 847 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 848 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 849 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 850 " MUST be set if Expected Data Transfer Length is not 0." 851 " Bad iSCSI Initiator\n"); 852 return iscsit_add_reject_cmd(cmd, 853 ISCSI_REASON_BOOKMARK_INVALID, buf); 854 } 855 856 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 857 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 858 pr_err("Bidirectional operations not supported!\n"); 859 return iscsit_add_reject_cmd(cmd, 860 ISCSI_REASON_BOOKMARK_INVALID, buf); 861 } 862 863 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 864 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 865 " Scsi Command PDU.\n"); 866 return iscsit_add_reject_cmd(cmd, 867 ISCSI_REASON_BOOKMARK_INVALID, buf); 868 } 869 870 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 871 pr_err("ImmediateData=No but DataSegmentLength=%u," 872 " protocol error.\n", payload_length); 873 return iscsit_add_reject_cmd(cmd, 874 ISCSI_REASON_PROTOCOL_ERROR, buf); 875 } 876 877 if ((be32_to_cpu(hdr->data_length) == payload_length) && 878 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 879 pr_err("Expected Data Transfer Length and Length of" 880 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 881 " bit is not set protocol error\n"); 882 return iscsit_add_reject_cmd(cmd, 883 ISCSI_REASON_PROTOCOL_ERROR, buf); 884 } 885 886 if (payload_length > be32_to_cpu(hdr->data_length)) { 887 pr_err("DataSegmentLength: %u is greater than" 888 " EDTL: %u, protocol error.\n", payload_length, 889 hdr->data_length); 890 return iscsit_add_reject_cmd(cmd, 891 ISCSI_REASON_PROTOCOL_ERROR, buf); 892 } 893 894 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 895 pr_err("DataSegmentLength: %u is greater than" 896 " MaxXmitDataSegmentLength: %u, protocol error.\n", 897 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 898 return iscsit_add_reject_cmd(cmd, 899 ISCSI_REASON_PROTOCOL_ERROR, buf); 900 } 901 902 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 903 pr_err("DataSegmentLength: %u is greater than" 904 " FirstBurstLength: %u, protocol error.\n", 905 payload_length, conn->sess->sess_ops->FirstBurstLength); 906 return iscsit_add_reject_cmd(cmd, 907 ISCSI_REASON_BOOKMARK_INVALID, buf); 908 } 909 910 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 911 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 912 DMA_NONE; 913 914 cmd->data_direction = data_direction; 915 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 916 /* 917 * Figure out the SAM Task Attribute for the incoming SCSI CDB 918 */ 919 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 920 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 921 sam_task_attr = MSG_SIMPLE_TAG; 922 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 923 sam_task_attr = MSG_ORDERED_TAG; 924 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 925 sam_task_attr = MSG_HEAD_TAG; 926 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 927 sam_task_attr = MSG_ACA_TAG; 928 else { 929 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 930 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 931 sam_task_attr = MSG_SIMPLE_TAG; 932 } 933 934 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 935 cmd->i_state = ISTATE_NEW_CMD; 936 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 937 cmd->immediate_data = (payload_length) ? 1 : 0; 938 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 939 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 940 if (cmd->unsolicited_data) 941 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 942 943 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 944 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 945 spin_lock_bh(&conn->sess->ttt_lock); 946 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 947 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 948 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 949 spin_unlock_bh(&conn->sess->ttt_lock); 950 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 951 cmd->targ_xfer_tag = 0xFFFFFFFF; 952 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 953 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 954 cmd->first_burst_len = payload_length; 955 956 if (!conn->sess->sess_ops->RDMAExtensions && 957 cmd->data_direction == DMA_FROM_DEVICE) { 958 struct iscsi_datain_req *dr; 959 960 dr = iscsit_allocate_datain_req(); 961 if (!dr) 962 return iscsit_add_reject_cmd(cmd, 963 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 964 965 iscsit_attach_datain_req(cmd, dr); 966 } 967 968 /* 969 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 970 */ 971 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 972 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 973 cmd->data_direction, sam_task_attr, 974 cmd->sense_buffer + 2); 975 976 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 977 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 978 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 979 conn->cid); 980 981 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 982 983 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 984 scsilun_to_int(&hdr->lun)); 985 if (cmd->sense_reason) 986 goto attach_cmd; 987 988 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 989 if (cmd->sense_reason) { 990 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 991 return iscsit_add_reject_cmd(cmd, 992 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 993 } 994 995 goto attach_cmd; 996 } 997 998 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 999 return iscsit_add_reject_cmd(cmd, 1000 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1001 } 1002 1003 attach_cmd: 1004 spin_lock_bh(&conn->cmd_lock); 1005 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1006 spin_unlock_bh(&conn->cmd_lock); 1007 /* 1008 * Check if we need to delay processing because of ALUA 1009 * Active/NonOptimized primary access state.. 1010 */ 1011 core_alua_check_nonop_delay(&cmd->se_cmd); 1012 1013 return 0; 1014 } 1015 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1016 1017 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1018 { 1019 iscsit_set_dataout_sequence_values(cmd); 1020 1021 spin_lock_bh(&cmd->dataout_timeout_lock); 1022 iscsit_start_dataout_timer(cmd, cmd->conn); 1023 spin_unlock_bh(&cmd->dataout_timeout_lock); 1024 } 1025 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1026 1027 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1028 struct iscsi_scsi_req *hdr) 1029 { 1030 int cmdsn_ret = 0; 1031 /* 1032 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1033 * the Immediate Bit is not set, and no Immediate 1034 * Data is attached. 1035 * 1036 * A PDU/CmdSN carrying Immediate Data can only 1037 * be processed after the DataCRC has passed. 1038 * If the DataCRC fails, the CmdSN MUST NOT 1039 * be acknowledged. (See below) 1040 */ 1041 if (!cmd->immediate_data) { 1042 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1043 (unsigned char *)hdr, hdr->cmdsn); 1044 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1045 return -1; 1046 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1047 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1048 return 0; 1049 } 1050 } 1051 1052 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1053 1054 /* 1055 * If no Immediate Data is attached, it's OK to return now. 1056 */ 1057 if (!cmd->immediate_data) { 1058 if (!cmd->sense_reason && cmd->unsolicited_data) 1059 iscsit_set_unsoliticed_dataout(cmd); 1060 if (!cmd->sense_reason) 1061 return 0; 1062 1063 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1064 return 0; 1065 } 1066 1067 /* 1068 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1069 * execution. These exceptions are processed in CmdSN order using 1070 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1071 */ 1072 if (cmd->sense_reason) { 1073 if (cmd->reject_reason) 1074 return 0; 1075 1076 return 1; 1077 } 1078 /* 1079 * Call directly into transport_generic_new_cmd() to perform 1080 * the backend memory allocation. 1081 */ 1082 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1083 if (cmd->sense_reason) 1084 return 1; 1085 1086 return 0; 1087 } 1088 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1089 1090 static int 1091 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1092 bool dump_payload) 1093 { 1094 struct iscsi_conn *conn = cmd->conn; 1095 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1096 /* 1097 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1098 */ 1099 if (dump_payload == true) 1100 goto after_immediate_data; 1101 1102 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1103 cmd->first_burst_len); 1104 after_immediate_data: 1105 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1106 /* 1107 * A PDU/CmdSN carrying Immediate Data passed 1108 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1109 * Immediate Bit is not set. 1110 */ 1111 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1112 (unsigned char *)hdr, hdr->cmdsn); 1113 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1114 return -1; 1115 1116 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1117 int rc; 1118 1119 rc = iscsit_dump_data_payload(cmd->conn, 1120 cmd->first_burst_len, 1); 1121 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1122 return rc; 1123 } else if (cmd->unsolicited_data) 1124 iscsit_set_unsoliticed_dataout(cmd); 1125 1126 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1127 /* 1128 * Immediate Data failed DataCRC and ERL>=1, 1129 * silently drop this PDU and let the initiator 1130 * plug the CmdSN gap. 1131 * 1132 * FIXME: Send Unsolicited NOPIN with reserved 1133 * TTT here to help the initiator figure out 1134 * the missing CmdSN, although they should be 1135 * intelligent enough to determine the missing 1136 * CmdSN and issue a retry to plug the sequence. 1137 */ 1138 cmd->i_state = ISTATE_REMOVE; 1139 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1140 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1141 return -1; 1142 1143 return 0; 1144 } 1145 1146 static int 1147 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1148 unsigned char *buf) 1149 { 1150 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1151 int rc, immed_data; 1152 bool dump_payload = false; 1153 1154 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1155 if (rc < 0) 1156 return 0; 1157 /* 1158 * Allocation iovecs needed for struct socket operations for 1159 * traditional iSCSI block I/O. 1160 */ 1161 if (iscsit_allocate_iovecs(cmd) < 0) { 1162 return iscsit_add_reject_cmd(cmd, 1163 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1164 } 1165 immed_data = cmd->immediate_data; 1166 1167 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1168 if (rc < 0) 1169 return rc; 1170 else if (rc > 0) 1171 dump_payload = true; 1172 1173 if (!immed_data) 1174 return 0; 1175 1176 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1177 } 1178 1179 static u32 iscsit_do_crypto_hash_sg( 1180 struct hash_desc *hash, 1181 struct iscsi_cmd *cmd, 1182 u32 data_offset, 1183 u32 data_length, 1184 u32 padding, 1185 u8 *pad_bytes) 1186 { 1187 u32 data_crc; 1188 u32 i; 1189 struct scatterlist *sg; 1190 unsigned int page_off; 1191 1192 crypto_hash_init(hash); 1193 1194 sg = cmd->first_data_sg; 1195 page_off = cmd->first_data_sg_off; 1196 1197 i = 0; 1198 while (data_length) { 1199 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1200 1201 crypto_hash_update(hash, &sg[i], cur_len); 1202 1203 data_length -= cur_len; 1204 page_off = 0; 1205 i++; 1206 } 1207 1208 if (padding) { 1209 struct scatterlist pad_sg; 1210 1211 sg_init_one(&pad_sg, pad_bytes, padding); 1212 crypto_hash_update(hash, &pad_sg, padding); 1213 } 1214 crypto_hash_final(hash, (u8 *) &data_crc); 1215 1216 return data_crc; 1217 } 1218 1219 static void iscsit_do_crypto_hash_buf( 1220 struct hash_desc *hash, 1221 const void *buf, 1222 u32 payload_length, 1223 u32 padding, 1224 u8 *pad_bytes, 1225 u8 *data_crc) 1226 { 1227 struct scatterlist sg; 1228 1229 crypto_hash_init(hash); 1230 1231 sg_init_one(&sg, buf, payload_length); 1232 crypto_hash_update(hash, &sg, payload_length); 1233 1234 if (padding) { 1235 sg_init_one(&sg, pad_bytes, padding); 1236 crypto_hash_update(hash, &sg, padding); 1237 } 1238 crypto_hash_final(hash, data_crc); 1239 } 1240 1241 int 1242 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1243 struct iscsi_cmd **out_cmd) 1244 { 1245 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1246 struct iscsi_cmd *cmd = NULL; 1247 struct se_cmd *se_cmd; 1248 u32 payload_length = ntoh24(hdr->dlength); 1249 int rc; 1250 1251 if (!payload_length) { 1252 pr_err("DataOUT payload is ZERO, protocol error.\n"); 1253 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1254 buf); 1255 } 1256 1257 /* iSCSI write */ 1258 spin_lock_bh(&conn->sess->session_stats_lock); 1259 conn->sess->rx_data_octets += payload_length; 1260 if (conn->sess->se_sess->se_node_acl) { 1261 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 1262 conn->sess->se_sess->se_node_acl->write_bytes += payload_length; 1263 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 1264 } 1265 spin_unlock_bh(&conn->sess->session_stats_lock); 1266 1267 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1268 pr_err("DataSegmentLength: %u is greater than" 1269 " MaxXmitDataSegmentLength: %u\n", payload_length, 1270 conn->conn_ops->MaxXmitDataSegmentLength); 1271 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1272 buf); 1273 } 1274 1275 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1276 payload_length); 1277 if (!cmd) 1278 return 0; 1279 1280 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1281 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1282 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1283 payload_length, conn->cid); 1284 1285 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1286 pr_err("Command ITT: 0x%08x received DataOUT after" 1287 " last DataOUT received, dumping payload\n", 1288 cmd->init_task_tag); 1289 return iscsit_dump_data_payload(conn, payload_length, 1); 1290 } 1291 1292 if (cmd->data_direction != DMA_TO_DEVICE) { 1293 pr_err("Command ITT: 0x%08x received DataOUT for a" 1294 " NON-WRITE command.\n", cmd->init_task_tag); 1295 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 1296 } 1297 se_cmd = &cmd->se_cmd; 1298 iscsit_mod_dataout_timer(cmd); 1299 1300 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1301 pr_err("DataOut Offset: %u, Length %u greater than" 1302 " iSCSI Command EDTL %u, protocol error.\n", 1303 hdr->offset, payload_length, cmd->se_cmd.data_length); 1304 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1305 } 1306 1307 if (cmd->unsolicited_data) { 1308 int dump_unsolicited_data = 0; 1309 1310 if (conn->sess->sess_ops->InitialR2T) { 1311 pr_err("Received unexpected unsolicited data" 1312 " while InitialR2T=Yes, protocol error.\n"); 1313 transport_send_check_condition_and_sense(&cmd->se_cmd, 1314 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1315 return -1; 1316 } 1317 /* 1318 * Special case for dealing with Unsolicited DataOUT 1319 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1320 * failures; 1321 */ 1322 1323 /* Something's amiss if we're not in WRITE_PENDING state... */ 1324 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1325 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1326 dump_unsolicited_data = 1; 1327 1328 if (dump_unsolicited_data) { 1329 /* 1330 * Check if a delayed TASK_ABORTED status needs to 1331 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1332 * received with the unsolicitied data out. 1333 */ 1334 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1335 iscsit_stop_dataout_timer(cmd); 1336 1337 transport_check_aborted_status(se_cmd, 1338 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1339 return iscsit_dump_data_payload(conn, payload_length, 1); 1340 } 1341 } else { 1342 /* 1343 * For the normal solicited data path: 1344 * 1345 * Check for a delayed TASK_ABORTED status and dump any 1346 * incoming data out payload if one exists. Also, when the 1347 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1348 * data out sequence, we decrement outstanding_r2ts. Once 1349 * outstanding_r2ts reaches zero, go ahead and send the delayed 1350 * TASK_ABORTED status. 1351 */ 1352 if (se_cmd->transport_state & CMD_T_ABORTED) { 1353 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1354 if (--cmd->outstanding_r2ts < 1) { 1355 iscsit_stop_dataout_timer(cmd); 1356 transport_check_aborted_status( 1357 se_cmd, 1); 1358 } 1359 1360 return iscsit_dump_data_payload(conn, payload_length, 1); 1361 } 1362 } 1363 /* 1364 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1365 * within-command recovery checks before receiving the payload. 1366 */ 1367 rc = iscsit_check_pre_dataout(cmd, buf); 1368 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1369 return 0; 1370 else if (rc == DATAOUT_CANNOT_RECOVER) 1371 return -1; 1372 1373 *out_cmd = cmd; 1374 return 0; 1375 } 1376 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1377 1378 static int 1379 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1380 struct iscsi_data *hdr) 1381 { 1382 struct kvec *iov; 1383 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1384 u32 payload_length = ntoh24(hdr->dlength); 1385 int iov_ret, data_crc_failed = 0; 1386 1387 rx_size += payload_length; 1388 iov = &cmd->iov_data[0]; 1389 1390 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1391 payload_length); 1392 if (iov_ret < 0) 1393 return -1; 1394 1395 iov_count += iov_ret; 1396 1397 padding = ((-payload_length) & 3); 1398 if (padding != 0) { 1399 iov[iov_count].iov_base = cmd->pad_bytes; 1400 iov[iov_count++].iov_len = padding; 1401 rx_size += padding; 1402 pr_debug("Receiving %u padding bytes.\n", padding); 1403 } 1404 1405 if (conn->conn_ops->DataDigest) { 1406 iov[iov_count].iov_base = &checksum; 1407 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1408 rx_size += ISCSI_CRC_LEN; 1409 } 1410 1411 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1412 1413 iscsit_unmap_iovec(cmd); 1414 1415 if (rx_got != rx_size) 1416 return -1; 1417 1418 if (conn->conn_ops->DataDigest) { 1419 u32 data_crc; 1420 1421 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1422 be32_to_cpu(hdr->offset), 1423 payload_length, padding, 1424 cmd->pad_bytes); 1425 1426 if (checksum != data_crc) { 1427 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1428 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1429 " does not match computed 0x%08x\n", 1430 hdr->itt, hdr->offset, payload_length, 1431 hdr->datasn, checksum, data_crc); 1432 data_crc_failed = 1; 1433 } else { 1434 pr_debug("Got CRC32C DataDigest 0x%08x for" 1435 " %u bytes of Data Out\n", checksum, 1436 payload_length); 1437 } 1438 } 1439 1440 return data_crc_failed; 1441 } 1442 1443 int 1444 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1445 bool data_crc_failed) 1446 { 1447 struct iscsi_conn *conn = cmd->conn; 1448 int rc, ooo_cmdsn; 1449 /* 1450 * Increment post receive data and CRC values or perform 1451 * within-command recovery. 1452 */ 1453 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1454 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1455 return 0; 1456 else if (rc == DATAOUT_SEND_R2T) { 1457 iscsit_set_dataout_sequence_values(cmd); 1458 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1459 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1460 /* 1461 * Handle extra special case for out of order 1462 * Unsolicited Data Out. 1463 */ 1464 spin_lock_bh(&cmd->istate_lock); 1465 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1466 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1467 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1468 spin_unlock_bh(&cmd->istate_lock); 1469 1470 iscsit_stop_dataout_timer(cmd); 1471 if (ooo_cmdsn) 1472 return 0; 1473 target_execute_cmd(&cmd->se_cmd); 1474 return 0; 1475 } else /* DATAOUT_CANNOT_RECOVER */ 1476 return -1; 1477 1478 return 0; 1479 } 1480 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1481 1482 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1483 { 1484 struct iscsi_cmd *cmd; 1485 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1486 int rc; 1487 bool data_crc_failed = false; 1488 1489 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1490 if (rc < 0) 1491 return 0; 1492 else if (!cmd) 1493 return 0; 1494 1495 rc = iscsit_get_dataout(conn, cmd, hdr); 1496 if (rc < 0) 1497 return rc; 1498 else if (rc > 0) 1499 data_crc_failed = true; 1500 1501 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1502 } 1503 1504 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1505 struct iscsi_nopout *hdr) 1506 { 1507 u32 payload_length = ntoh24(hdr->dlength); 1508 1509 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1510 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1511 " not set, protocol error.\n"); 1512 if (!cmd) 1513 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1514 (unsigned char *)hdr); 1515 1516 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1517 (unsigned char *)hdr); 1518 } 1519 1520 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1521 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1522 " greater than MaxXmitDataSegmentLength: %u, protocol" 1523 " error.\n", payload_length, 1524 conn->conn_ops->MaxXmitDataSegmentLength); 1525 if (!cmd) 1526 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1527 (unsigned char *)hdr); 1528 1529 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1530 (unsigned char *)hdr); 1531 } 1532 1533 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1534 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1535 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1536 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1537 payload_length); 1538 /* 1539 * This is not a response to a Unsolicited NopIN, which means 1540 * it can either be a NOPOUT ping request (with a valid ITT), 1541 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1542 * Either way, make sure we allocate an struct iscsi_cmd, as both 1543 * can contain ping data. 1544 */ 1545 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1546 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1547 cmd->i_state = ISTATE_SEND_NOPIN; 1548 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1549 1 : 0); 1550 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1551 cmd->targ_xfer_tag = 0xFFFFFFFF; 1552 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1553 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1554 cmd->data_direction = DMA_NONE; 1555 } 1556 1557 return 0; 1558 } 1559 EXPORT_SYMBOL(iscsit_setup_nop_out); 1560 1561 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1562 struct iscsi_nopout *hdr) 1563 { 1564 struct iscsi_cmd *cmd_p = NULL; 1565 int cmdsn_ret = 0; 1566 /* 1567 * Initiator is expecting a NopIN ping reply.. 1568 */ 1569 if (hdr->itt != RESERVED_ITT) { 1570 BUG_ON(!cmd); 1571 1572 spin_lock_bh(&conn->cmd_lock); 1573 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1574 spin_unlock_bh(&conn->cmd_lock); 1575 1576 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1577 1578 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1579 iscsit_add_cmd_to_response_queue(cmd, conn, 1580 cmd->i_state); 1581 return 0; 1582 } 1583 1584 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1585 (unsigned char *)hdr, hdr->cmdsn); 1586 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1587 return 0; 1588 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1589 return -1; 1590 1591 return 0; 1592 } 1593 /* 1594 * This was a response to a unsolicited NOPIN ping. 1595 */ 1596 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1597 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1598 if (!cmd_p) 1599 return -EINVAL; 1600 1601 iscsit_stop_nopin_response_timer(conn); 1602 1603 cmd_p->i_state = ISTATE_REMOVE; 1604 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1605 1606 iscsit_start_nopin_timer(conn); 1607 return 0; 1608 } 1609 /* 1610 * Otherwise, initiator is not expecting a NOPIN is response. 1611 * Just ignore for now. 1612 */ 1613 return 0; 1614 } 1615 EXPORT_SYMBOL(iscsit_process_nop_out); 1616 1617 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1618 unsigned char *buf) 1619 { 1620 unsigned char *ping_data = NULL; 1621 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1622 struct kvec *iov = NULL; 1623 u32 payload_length = ntoh24(hdr->dlength); 1624 int ret; 1625 1626 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1627 if (ret < 0) 1628 return 0; 1629 /* 1630 * Handle NOP-OUT payload for traditional iSCSI sockets 1631 */ 1632 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1633 u32 checksum, data_crc, padding = 0; 1634 int niov = 0, rx_got, rx_size = payload_length; 1635 1636 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1637 if (!ping_data) { 1638 pr_err("Unable to allocate memory for" 1639 " NOPOUT ping data.\n"); 1640 ret = -1; 1641 goto out; 1642 } 1643 1644 iov = &cmd->iov_misc[0]; 1645 iov[niov].iov_base = ping_data; 1646 iov[niov++].iov_len = payload_length; 1647 1648 padding = ((-payload_length) & 3); 1649 if (padding != 0) { 1650 pr_debug("Receiving %u additional bytes" 1651 " for padding.\n", padding); 1652 iov[niov].iov_base = &cmd->pad_bytes; 1653 iov[niov++].iov_len = padding; 1654 rx_size += padding; 1655 } 1656 if (conn->conn_ops->DataDigest) { 1657 iov[niov].iov_base = &checksum; 1658 iov[niov++].iov_len = ISCSI_CRC_LEN; 1659 rx_size += ISCSI_CRC_LEN; 1660 } 1661 1662 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1663 if (rx_got != rx_size) { 1664 ret = -1; 1665 goto out; 1666 } 1667 1668 if (conn->conn_ops->DataDigest) { 1669 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1670 ping_data, payload_length, 1671 padding, cmd->pad_bytes, 1672 (u8 *)&data_crc); 1673 1674 if (checksum != data_crc) { 1675 pr_err("Ping data CRC32C DataDigest" 1676 " 0x%08x does not match computed 0x%08x\n", 1677 checksum, data_crc); 1678 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1679 pr_err("Unable to recover from" 1680 " NOPOUT Ping DataCRC failure while in" 1681 " ERL=0.\n"); 1682 ret = -1; 1683 goto out; 1684 } else { 1685 /* 1686 * Silently drop this PDU and let the 1687 * initiator plug the CmdSN gap. 1688 */ 1689 pr_debug("Dropping NOPOUT" 1690 " Command CmdSN: 0x%08x due to" 1691 " DataCRC error.\n", hdr->cmdsn); 1692 ret = 0; 1693 goto out; 1694 } 1695 } else { 1696 pr_debug("Got CRC32C DataDigest" 1697 " 0x%08x for %u bytes of ping data.\n", 1698 checksum, payload_length); 1699 } 1700 } 1701 1702 ping_data[payload_length] = '\0'; 1703 /* 1704 * Attach ping data to struct iscsi_cmd->buf_ptr. 1705 */ 1706 cmd->buf_ptr = ping_data; 1707 cmd->buf_ptr_size = payload_length; 1708 1709 pr_debug("Got %u bytes of NOPOUT ping" 1710 " data.\n", payload_length); 1711 pr_debug("Ping Data: \"%s\"\n", ping_data); 1712 } 1713 1714 return iscsit_process_nop_out(conn, cmd, hdr); 1715 out: 1716 if (cmd) 1717 iscsit_free_cmd(cmd, false); 1718 1719 kfree(ping_data); 1720 return ret; 1721 } 1722 1723 int 1724 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1725 unsigned char *buf) 1726 { 1727 struct se_tmr_req *se_tmr; 1728 struct iscsi_tmr_req *tmr_req; 1729 struct iscsi_tm *hdr; 1730 int out_of_order_cmdsn = 0, ret; 1731 bool sess_ref = false; 1732 u8 function; 1733 1734 hdr = (struct iscsi_tm *) buf; 1735 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1736 function = hdr->flags; 1737 1738 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1739 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1740 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1741 hdr->rtt, hdr->refcmdsn, conn->cid); 1742 1743 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1744 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1745 hdr->rtt != RESERVED_ITT)) { 1746 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1747 hdr->rtt = RESERVED_ITT; 1748 } 1749 1750 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1751 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1752 pr_err("Task Management Request TASK_REASSIGN not" 1753 " issued as immediate command, bad iSCSI Initiator" 1754 "implementation\n"); 1755 return iscsit_add_reject_cmd(cmd, 1756 ISCSI_REASON_PROTOCOL_ERROR, buf); 1757 } 1758 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1759 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1760 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1761 1762 cmd->data_direction = DMA_NONE; 1763 1764 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1765 if (!cmd->tmr_req) { 1766 pr_err("Unable to allocate memory for" 1767 " Task Management command!\n"); 1768 return iscsit_add_reject_cmd(cmd, 1769 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1770 buf); 1771 } 1772 1773 /* 1774 * TASK_REASSIGN for ERL=2 / connection stays inside of 1775 * LIO-Target $FABRIC_MOD 1776 */ 1777 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1778 1779 u8 tcm_function; 1780 int ret; 1781 1782 transport_init_se_cmd(&cmd->se_cmd, 1783 &lio_target_fabric_configfs->tf_ops, 1784 conn->sess->se_sess, 0, DMA_NONE, 1785 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1786 1787 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1788 sess_ref = true; 1789 1790 switch (function) { 1791 case ISCSI_TM_FUNC_ABORT_TASK: 1792 tcm_function = TMR_ABORT_TASK; 1793 break; 1794 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1795 tcm_function = TMR_ABORT_TASK_SET; 1796 break; 1797 case ISCSI_TM_FUNC_CLEAR_ACA: 1798 tcm_function = TMR_CLEAR_ACA; 1799 break; 1800 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1801 tcm_function = TMR_CLEAR_TASK_SET; 1802 break; 1803 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1804 tcm_function = TMR_LUN_RESET; 1805 break; 1806 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1807 tcm_function = TMR_TARGET_WARM_RESET; 1808 break; 1809 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1810 tcm_function = TMR_TARGET_COLD_RESET; 1811 break; 1812 default: 1813 pr_err("Unknown iSCSI TMR Function:" 1814 " 0x%02x\n", function); 1815 return iscsit_add_reject_cmd(cmd, 1816 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1817 } 1818 1819 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1820 tcm_function, GFP_KERNEL); 1821 if (ret < 0) 1822 return iscsit_add_reject_cmd(cmd, 1823 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1824 1825 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1826 } 1827 1828 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1829 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1830 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1831 cmd->init_task_tag = hdr->itt; 1832 cmd->targ_xfer_tag = 0xFFFFFFFF; 1833 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1834 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1835 se_tmr = cmd->se_cmd.se_tmr_req; 1836 tmr_req = cmd->tmr_req; 1837 /* 1838 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1839 */ 1840 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1841 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1842 scsilun_to_int(&hdr->lun)); 1843 if (ret < 0) { 1844 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1845 goto attach; 1846 } 1847 } 1848 1849 switch (function) { 1850 case ISCSI_TM_FUNC_ABORT_TASK: 1851 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1852 if (se_tmr->response) 1853 goto attach; 1854 break; 1855 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1856 case ISCSI_TM_FUNC_CLEAR_ACA: 1857 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1858 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1859 break; 1860 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1861 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1862 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1863 goto attach; 1864 } 1865 break; 1866 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1867 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1868 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1869 goto attach; 1870 } 1871 break; 1872 case ISCSI_TM_FUNC_TASK_REASSIGN: 1873 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1874 /* 1875 * Perform sanity checks on the ExpDataSN only if the 1876 * TASK_REASSIGN was successful. 1877 */ 1878 if (se_tmr->response) 1879 break; 1880 1881 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1882 return iscsit_add_reject_cmd(cmd, 1883 ISCSI_REASON_BOOKMARK_INVALID, buf); 1884 break; 1885 default: 1886 pr_err("Unknown TMR function: 0x%02x, protocol" 1887 " error.\n", function); 1888 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1889 goto attach; 1890 } 1891 1892 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1893 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1894 se_tmr->call_transport = 1; 1895 attach: 1896 spin_lock_bh(&conn->cmd_lock); 1897 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1898 spin_unlock_bh(&conn->cmd_lock); 1899 1900 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1901 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1902 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1903 out_of_order_cmdsn = 1; 1904 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1905 return 0; 1906 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1907 return -1; 1908 } 1909 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1910 1911 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1912 return 0; 1913 /* 1914 * Found the referenced task, send to transport for processing. 1915 */ 1916 if (se_tmr->call_transport) 1917 return transport_generic_handle_tmr(&cmd->se_cmd); 1918 1919 /* 1920 * Could not find the referenced LUN, task, or Task Management 1921 * command not authorized or supported. Change state and 1922 * let the tx_thread send the response. 1923 * 1924 * For connection recovery, this is also the default action for 1925 * TMR TASK_REASSIGN. 1926 */ 1927 if (sess_ref) { 1928 pr_debug("Handle TMR, using sess_ref=true check\n"); 1929 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1930 } 1931 1932 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1933 return 0; 1934 } 1935 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1936 1937 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1938 int 1939 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1940 struct iscsi_text *hdr) 1941 { 1942 u32 payload_length = ntoh24(hdr->dlength); 1943 1944 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1945 pr_err("Unable to accept text parameter length: %u" 1946 "greater than MaxXmitDataSegmentLength %u.\n", 1947 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1948 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1949 (unsigned char *)hdr); 1950 } 1951 1952 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1953 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1954 hdr->exp_statsn, payload_length); 1955 1956 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1957 cmd->i_state = ISTATE_SEND_TEXTRSP; 1958 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1959 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1960 cmd->targ_xfer_tag = 0xFFFFFFFF; 1961 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1962 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1963 cmd->data_direction = DMA_NONE; 1964 1965 return 0; 1966 } 1967 EXPORT_SYMBOL(iscsit_setup_text_cmd); 1968 1969 int 1970 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1971 struct iscsi_text *hdr) 1972 { 1973 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 1974 int cmdsn_ret; 1975 1976 if (!text_in) { 1977 pr_err("Unable to locate text_in buffer for sendtargets" 1978 " discovery\n"); 1979 goto reject; 1980 } 1981 if (strncmp("SendTargets", text_in, 11) != 0) { 1982 pr_err("Received Text Data that is not" 1983 " SendTargets, cannot continue.\n"); 1984 goto reject; 1985 } 1986 text_ptr = strchr(text_in, '='); 1987 if (!text_ptr) { 1988 pr_err("No \"=\" separator found in Text Data," 1989 " cannot continue.\n"); 1990 goto reject; 1991 } 1992 if (!strncmp("=All", text_ptr, 4)) { 1993 cmd->cmd_flags |= IFC_SENDTARGETS_ALL; 1994 } else if (!strncmp("=iqn.", text_ptr, 5) || 1995 !strncmp("=eui.", text_ptr, 5)) { 1996 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE; 1997 } else { 1998 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 1999 goto reject; 2000 } 2001 2002 spin_lock_bh(&conn->cmd_lock); 2003 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2004 spin_unlock_bh(&conn->cmd_lock); 2005 2006 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2007 2008 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2009 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2010 (unsigned char *)hdr, hdr->cmdsn); 2011 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2012 return -1; 2013 2014 return 0; 2015 } 2016 2017 return iscsit_execute_cmd(cmd, 0); 2018 2019 reject: 2020 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2021 (unsigned char *)hdr); 2022 } 2023 EXPORT_SYMBOL(iscsit_process_text_cmd); 2024 2025 static int 2026 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2027 unsigned char *buf) 2028 { 2029 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2030 char *text_in = NULL; 2031 u32 payload_length = ntoh24(hdr->dlength); 2032 int rx_size, rc; 2033 2034 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2035 if (rc < 0) 2036 return 0; 2037 2038 rx_size = payload_length; 2039 if (payload_length) { 2040 u32 checksum = 0, data_crc = 0; 2041 u32 padding = 0, pad_bytes = 0; 2042 int niov = 0, rx_got; 2043 struct kvec iov[3]; 2044 2045 text_in = kzalloc(payload_length, GFP_KERNEL); 2046 if (!text_in) { 2047 pr_err("Unable to allocate memory for" 2048 " incoming text parameters\n"); 2049 goto reject; 2050 } 2051 cmd->text_in_ptr = text_in; 2052 2053 memset(iov, 0, 3 * sizeof(struct kvec)); 2054 iov[niov].iov_base = text_in; 2055 iov[niov++].iov_len = payload_length; 2056 2057 padding = ((-payload_length) & 3); 2058 if (padding != 0) { 2059 iov[niov].iov_base = &pad_bytes; 2060 iov[niov++].iov_len = padding; 2061 rx_size += padding; 2062 pr_debug("Receiving %u additional bytes" 2063 " for padding.\n", padding); 2064 } 2065 if (conn->conn_ops->DataDigest) { 2066 iov[niov].iov_base = &checksum; 2067 iov[niov++].iov_len = ISCSI_CRC_LEN; 2068 rx_size += ISCSI_CRC_LEN; 2069 } 2070 2071 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2072 if (rx_got != rx_size) 2073 goto reject; 2074 2075 if (conn->conn_ops->DataDigest) { 2076 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2077 text_in, payload_length, 2078 padding, (u8 *)&pad_bytes, 2079 (u8 *)&data_crc); 2080 2081 if (checksum != data_crc) { 2082 pr_err("Text data CRC32C DataDigest" 2083 " 0x%08x does not match computed" 2084 " 0x%08x\n", checksum, data_crc); 2085 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2086 pr_err("Unable to recover from" 2087 " Text Data digest failure while in" 2088 " ERL=0.\n"); 2089 goto reject; 2090 } else { 2091 /* 2092 * Silently drop this PDU and let the 2093 * initiator plug the CmdSN gap. 2094 */ 2095 pr_debug("Dropping Text" 2096 " Command CmdSN: 0x%08x due to" 2097 " DataCRC error.\n", hdr->cmdsn); 2098 kfree(text_in); 2099 return 0; 2100 } 2101 } else { 2102 pr_debug("Got CRC32C DataDigest" 2103 " 0x%08x for %u bytes of text data.\n", 2104 checksum, payload_length); 2105 } 2106 } 2107 text_in[payload_length - 1] = '\0'; 2108 pr_debug("Successfully read %d bytes of text" 2109 " data.\n", payload_length); 2110 } 2111 2112 return iscsit_process_text_cmd(conn, cmd, hdr); 2113 2114 reject: 2115 kfree(cmd->text_in_ptr); 2116 cmd->text_in_ptr = NULL; 2117 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2118 } 2119 EXPORT_SYMBOL(iscsit_handle_text_cmd); 2120 2121 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2122 { 2123 struct iscsi_conn *conn_p; 2124 struct iscsi_session *sess = conn->sess; 2125 2126 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2127 " for SID: %u.\n", conn->cid, conn->sess->sid); 2128 2129 atomic_set(&sess->session_logout, 1); 2130 atomic_set(&conn->conn_logout_remove, 1); 2131 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2132 2133 iscsit_inc_conn_usage_count(conn); 2134 iscsit_inc_session_usage_count(sess); 2135 2136 spin_lock_bh(&sess->conn_lock); 2137 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2138 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2139 continue; 2140 2141 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2142 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2143 } 2144 spin_unlock_bh(&sess->conn_lock); 2145 2146 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2147 2148 return 0; 2149 } 2150 2151 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2152 { 2153 struct iscsi_conn *l_conn; 2154 struct iscsi_session *sess = conn->sess; 2155 2156 pr_debug("Received logout request CLOSECONNECTION for CID:" 2157 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2158 2159 /* 2160 * A Logout Request with a CLOSECONNECTION reason code for a CID 2161 * can arrive on a connection with a differing CID. 2162 */ 2163 if (conn->cid == cmd->logout_cid) { 2164 spin_lock_bh(&conn->state_lock); 2165 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2166 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2167 2168 atomic_set(&conn->conn_logout_remove, 1); 2169 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2170 iscsit_inc_conn_usage_count(conn); 2171 2172 spin_unlock_bh(&conn->state_lock); 2173 } else { 2174 /* 2175 * Handle all different cid CLOSECONNECTION requests in 2176 * iscsit_logout_post_handler_diffcid() as to give enough 2177 * time for any non immediate command's CmdSN to be 2178 * acknowledged on the connection in question. 2179 * 2180 * Here we simply make sure the CID is still around. 2181 */ 2182 l_conn = iscsit_get_conn_from_cid(sess, 2183 cmd->logout_cid); 2184 if (!l_conn) { 2185 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2186 iscsit_add_cmd_to_response_queue(cmd, conn, 2187 cmd->i_state); 2188 return 0; 2189 } 2190 2191 iscsit_dec_conn_usage_count(l_conn); 2192 } 2193 2194 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2195 2196 return 0; 2197 } 2198 2199 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2200 { 2201 struct iscsi_session *sess = conn->sess; 2202 2203 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2204 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2205 2206 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2207 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2208 " while ERL!=2.\n"); 2209 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2210 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2211 return 0; 2212 } 2213 2214 if (conn->cid == cmd->logout_cid) { 2215 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2216 " with CID: %hu on CID: %hu, implementation error.\n", 2217 cmd->logout_cid, conn->cid); 2218 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2219 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2220 return 0; 2221 } 2222 2223 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2224 2225 return 0; 2226 } 2227 2228 int 2229 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2230 unsigned char *buf) 2231 { 2232 int cmdsn_ret, logout_remove = 0; 2233 u8 reason_code = 0; 2234 struct iscsi_logout *hdr; 2235 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2236 2237 hdr = (struct iscsi_logout *) buf; 2238 reason_code = (hdr->flags & 0x7f); 2239 2240 if (tiqn) { 2241 spin_lock(&tiqn->logout_stats.lock); 2242 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2243 tiqn->logout_stats.normal_logouts++; 2244 else 2245 tiqn->logout_stats.abnormal_logouts++; 2246 spin_unlock(&tiqn->logout_stats.lock); 2247 } 2248 2249 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2250 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2251 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2252 hdr->cid, conn->cid); 2253 2254 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2255 pr_err("Received logout request on connection that" 2256 " is not in logged in state, ignoring request.\n"); 2257 iscsit_free_cmd(cmd, false); 2258 return 0; 2259 } 2260 2261 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2262 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2263 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2264 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2265 cmd->targ_xfer_tag = 0xFFFFFFFF; 2266 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2267 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2268 cmd->logout_cid = be16_to_cpu(hdr->cid); 2269 cmd->logout_reason = reason_code; 2270 cmd->data_direction = DMA_NONE; 2271 2272 /* 2273 * We need to sleep in these cases (by returning 1) until the Logout 2274 * Response gets sent in the tx thread. 2275 */ 2276 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2277 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2278 be16_to_cpu(hdr->cid) == conn->cid)) 2279 logout_remove = 1; 2280 2281 spin_lock_bh(&conn->cmd_lock); 2282 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2283 spin_unlock_bh(&conn->cmd_lock); 2284 2285 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2286 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2287 2288 /* 2289 * Immediate commands are executed, well, immediately. 2290 * Non-Immediate Logout Commands are executed in CmdSN order. 2291 */ 2292 if (cmd->immediate_cmd) { 2293 int ret = iscsit_execute_cmd(cmd, 0); 2294 2295 if (ret < 0) 2296 return ret; 2297 } else { 2298 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2299 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2300 logout_remove = 0; 2301 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2302 return -1; 2303 } 2304 2305 return logout_remove; 2306 } 2307 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2308 2309 static int iscsit_handle_snack( 2310 struct iscsi_conn *conn, 2311 unsigned char *buf) 2312 { 2313 struct iscsi_snack *hdr; 2314 2315 hdr = (struct iscsi_snack *) buf; 2316 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2317 2318 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2319 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2320 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2321 hdr->begrun, hdr->runlength, conn->cid); 2322 2323 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2324 pr_err("Initiator sent SNACK request while in" 2325 " ErrorRecoveryLevel=0.\n"); 2326 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2327 buf); 2328 } 2329 /* 2330 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2331 * call from inside iscsi_send_recovery_datain_or_r2t(). 2332 */ 2333 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2334 case 0: 2335 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2336 hdr->itt, 2337 be32_to_cpu(hdr->ttt), 2338 be32_to_cpu(hdr->begrun), 2339 be32_to_cpu(hdr->runlength)); 2340 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2341 return iscsit_handle_status_snack(conn, hdr->itt, 2342 be32_to_cpu(hdr->ttt), 2343 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2344 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2345 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2346 be32_to_cpu(hdr->begrun), 2347 be32_to_cpu(hdr->runlength)); 2348 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2349 /* FIXME: Support R-Data SNACK */ 2350 pr_err("R-Data SNACK Not Supported.\n"); 2351 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2352 buf); 2353 default: 2354 pr_err("Unknown SNACK type 0x%02x, protocol" 2355 " error.\n", hdr->flags & 0x0f); 2356 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2357 buf); 2358 } 2359 2360 return 0; 2361 } 2362 2363 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2364 { 2365 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2366 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2367 wait_for_completion_interruptible_timeout( 2368 &conn->rx_half_close_comp, 2369 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2370 } 2371 } 2372 2373 static int iscsit_handle_immediate_data( 2374 struct iscsi_cmd *cmd, 2375 struct iscsi_scsi_req *hdr, 2376 u32 length) 2377 { 2378 int iov_ret, rx_got = 0, rx_size = 0; 2379 u32 checksum, iov_count = 0, padding = 0; 2380 struct iscsi_conn *conn = cmd->conn; 2381 struct kvec *iov; 2382 2383 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2384 if (iov_ret < 0) 2385 return IMMEDIATE_DATA_CANNOT_RECOVER; 2386 2387 rx_size = length; 2388 iov_count = iov_ret; 2389 iov = &cmd->iov_data[0]; 2390 2391 padding = ((-length) & 3); 2392 if (padding != 0) { 2393 iov[iov_count].iov_base = cmd->pad_bytes; 2394 iov[iov_count++].iov_len = padding; 2395 rx_size += padding; 2396 } 2397 2398 if (conn->conn_ops->DataDigest) { 2399 iov[iov_count].iov_base = &checksum; 2400 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2401 rx_size += ISCSI_CRC_LEN; 2402 } 2403 2404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2405 2406 iscsit_unmap_iovec(cmd); 2407 2408 if (rx_got != rx_size) { 2409 iscsit_rx_thread_wait_for_tcp(conn); 2410 return IMMEDIATE_DATA_CANNOT_RECOVER; 2411 } 2412 2413 if (conn->conn_ops->DataDigest) { 2414 u32 data_crc; 2415 2416 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2417 cmd->write_data_done, length, padding, 2418 cmd->pad_bytes); 2419 2420 if (checksum != data_crc) { 2421 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2422 " does not match computed 0x%08x\n", checksum, 2423 data_crc); 2424 2425 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2426 pr_err("Unable to recover from" 2427 " Immediate Data digest failure while" 2428 " in ERL=0.\n"); 2429 iscsit_reject_cmd(cmd, 2430 ISCSI_REASON_DATA_DIGEST_ERROR, 2431 (unsigned char *)hdr); 2432 return IMMEDIATE_DATA_CANNOT_RECOVER; 2433 } else { 2434 iscsit_reject_cmd(cmd, 2435 ISCSI_REASON_DATA_DIGEST_ERROR, 2436 (unsigned char *)hdr); 2437 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2438 } 2439 } else { 2440 pr_debug("Got CRC32C DataDigest 0x%08x for" 2441 " %u bytes of Immediate Data\n", checksum, 2442 length); 2443 } 2444 } 2445 2446 cmd->write_data_done += length; 2447 2448 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2449 spin_lock_bh(&cmd->istate_lock); 2450 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2451 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2452 spin_unlock_bh(&cmd->istate_lock); 2453 } 2454 2455 return IMMEDIATE_DATA_NORMAL_OPERATION; 2456 } 2457 2458 /* 2459 * Called with sess->conn_lock held. 2460 */ 2461 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2462 with active network interface */ 2463 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2464 { 2465 struct iscsi_cmd *cmd; 2466 struct iscsi_conn *conn_p; 2467 2468 /* 2469 * Only send a Asynchronous Message on connections whos network 2470 * interface is still functional. 2471 */ 2472 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2473 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2474 iscsit_inc_conn_usage_count(conn_p); 2475 break; 2476 } 2477 } 2478 2479 if (!conn_p) 2480 return; 2481 2482 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC); 2483 if (!cmd) { 2484 iscsit_dec_conn_usage_count(conn_p); 2485 return; 2486 } 2487 2488 cmd->logout_cid = conn->cid; 2489 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2490 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2491 2492 spin_lock_bh(&conn_p->cmd_lock); 2493 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2494 spin_unlock_bh(&conn_p->cmd_lock); 2495 2496 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2497 iscsit_dec_conn_usage_count(conn_p); 2498 } 2499 2500 static int iscsit_send_conn_drop_async_message( 2501 struct iscsi_cmd *cmd, 2502 struct iscsi_conn *conn) 2503 { 2504 struct iscsi_async *hdr; 2505 2506 cmd->tx_size = ISCSI_HDR_LEN; 2507 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2508 2509 hdr = (struct iscsi_async *) cmd->pdu; 2510 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2511 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2512 cmd->init_task_tag = RESERVED_ITT; 2513 cmd->targ_xfer_tag = 0xFFFFFFFF; 2514 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2515 cmd->stat_sn = conn->stat_sn++; 2516 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2519 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2520 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2521 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2522 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2523 2524 if (conn->conn_ops->HeaderDigest) { 2525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2526 2527 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2528 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2529 2530 cmd->tx_size += ISCSI_CRC_LEN; 2531 pr_debug("Attaching CRC32C HeaderDigest to" 2532 " Async Message 0x%08x\n", *header_digest); 2533 } 2534 2535 cmd->iov_misc[0].iov_base = cmd->pdu; 2536 cmd->iov_misc[0].iov_len = cmd->tx_size; 2537 cmd->iov_misc_count = 1; 2538 2539 pr_debug("Sending Connection Dropped Async Message StatSN:" 2540 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2541 cmd->logout_cid, conn->cid); 2542 return 0; 2543 } 2544 2545 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2546 { 2547 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2548 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2549 wait_for_completion_interruptible_timeout( 2550 &conn->tx_half_close_comp, 2551 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2552 } 2553 } 2554 2555 static void 2556 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2557 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2558 bool set_statsn) 2559 { 2560 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2561 hdr->flags = datain->flags; 2562 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2563 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2564 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2565 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2566 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2567 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2568 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2569 } 2570 } 2571 hton24(hdr->dlength, datain->length); 2572 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2573 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2574 (struct scsi_lun *)&hdr->lun); 2575 else 2576 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2577 2578 hdr->itt = cmd->init_task_tag; 2579 2580 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2581 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2582 else 2583 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2584 if (set_statsn) 2585 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2586 else 2587 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2588 2589 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2590 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2591 hdr->datasn = cpu_to_be32(datain->data_sn); 2592 hdr->offset = cpu_to_be32(datain->offset); 2593 2594 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2595 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2596 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2597 ntohl(hdr->offset), datain->length, conn->cid); 2598 } 2599 2600 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2601 { 2602 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2603 struct iscsi_datain datain; 2604 struct iscsi_datain_req *dr; 2605 struct kvec *iov; 2606 u32 iov_count = 0, tx_size = 0; 2607 int eodr = 0, ret, iov_ret; 2608 bool set_statsn = false; 2609 2610 memset(&datain, 0, sizeof(struct iscsi_datain)); 2611 dr = iscsit_get_datain_values(cmd, &datain); 2612 if (!dr) { 2613 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2614 cmd->init_task_tag); 2615 return -1; 2616 } 2617 /* 2618 * Be paranoid and double check the logic for now. 2619 */ 2620 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2621 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2622 " datain.length: %u exceeds cmd->data_length: %u\n", 2623 cmd->init_task_tag, datain.offset, datain.length, 2624 cmd->se_cmd.data_length); 2625 return -1; 2626 } 2627 2628 spin_lock_bh(&conn->sess->session_stats_lock); 2629 conn->sess->tx_data_octets += datain.length; 2630 if (conn->sess->se_sess->se_node_acl) { 2631 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 2632 conn->sess->se_sess->se_node_acl->read_bytes += datain.length; 2633 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 2634 } 2635 spin_unlock_bh(&conn->sess->session_stats_lock); 2636 /* 2637 * Special case for successfully execution w/ both DATAIN 2638 * and Sense Data. 2639 */ 2640 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2641 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2642 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2643 else { 2644 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2645 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2646 iscsit_increment_maxcmdsn(cmd, conn->sess); 2647 cmd->stat_sn = conn->stat_sn++; 2648 set_statsn = true; 2649 } else if (dr->dr_complete == 2650 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2651 set_statsn = true; 2652 } 2653 2654 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2655 2656 iov = &cmd->iov_data[0]; 2657 iov[iov_count].iov_base = cmd->pdu; 2658 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2659 tx_size += ISCSI_HDR_LEN; 2660 2661 if (conn->conn_ops->HeaderDigest) { 2662 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2663 2664 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2665 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2666 2667 iov[0].iov_len += ISCSI_CRC_LEN; 2668 tx_size += ISCSI_CRC_LEN; 2669 2670 pr_debug("Attaching CRC32 HeaderDigest" 2671 " for DataIN PDU 0x%08x\n", *header_digest); 2672 } 2673 2674 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2675 datain.offset, datain.length); 2676 if (iov_ret < 0) 2677 return -1; 2678 2679 iov_count += iov_ret; 2680 tx_size += datain.length; 2681 2682 cmd->padding = ((-datain.length) & 3); 2683 if (cmd->padding) { 2684 iov[iov_count].iov_base = cmd->pad_bytes; 2685 iov[iov_count++].iov_len = cmd->padding; 2686 tx_size += cmd->padding; 2687 2688 pr_debug("Attaching %u padding bytes\n", 2689 cmd->padding); 2690 } 2691 if (conn->conn_ops->DataDigest) { 2692 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2693 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2694 2695 iov[iov_count].iov_base = &cmd->data_crc; 2696 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2697 tx_size += ISCSI_CRC_LEN; 2698 2699 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2700 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2701 } 2702 2703 cmd->iov_data_count = iov_count; 2704 cmd->tx_size = tx_size; 2705 2706 /* sendpage is preferred but can't insert markers */ 2707 if (!conn->conn_ops->IFMarker) 2708 ret = iscsit_fe_sendpage_sg(cmd, conn); 2709 else 2710 ret = iscsit_send_tx_data(cmd, conn, 0); 2711 2712 iscsit_unmap_iovec(cmd); 2713 2714 if (ret < 0) { 2715 iscsit_tx_thread_wait_for_tcp(conn); 2716 return ret; 2717 } 2718 2719 if (dr->dr_complete) { 2720 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2721 2 : 1; 2722 iscsit_free_datain_req(cmd, dr); 2723 } 2724 2725 return eodr; 2726 } 2727 2728 int 2729 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2730 struct iscsi_logout_rsp *hdr) 2731 { 2732 struct iscsi_conn *logout_conn = NULL; 2733 struct iscsi_conn_recovery *cr = NULL; 2734 struct iscsi_session *sess = conn->sess; 2735 /* 2736 * The actual shutting down of Sessions and/or Connections 2737 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2738 * is done in scsi_logout_post_handler(). 2739 */ 2740 switch (cmd->logout_reason) { 2741 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2742 pr_debug("iSCSI session logout successful, setting" 2743 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2744 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2745 break; 2746 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2747 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2748 break; 2749 /* 2750 * For CLOSECONNECTION logout requests carrying 2751 * a matching logout CID -> local CID, the reference 2752 * for the local CID will have been incremented in 2753 * iscsi_logout_closeconnection(). 2754 * 2755 * For CLOSECONNECTION logout requests carrying 2756 * a different CID than the connection it arrived 2757 * on, the connection responding to cmd->logout_cid 2758 * is stopped in iscsit_logout_post_handler_diffcid(). 2759 */ 2760 2761 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2762 " successful.\n", cmd->logout_cid, conn->cid); 2763 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2764 break; 2765 case ISCSI_LOGOUT_REASON_RECOVERY: 2766 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2767 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2768 break; 2769 /* 2770 * If the connection is still active from our point of view 2771 * force connection recovery to occur. 2772 */ 2773 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2774 cmd->logout_cid); 2775 if (logout_conn) { 2776 iscsit_connection_reinstatement_rcfr(logout_conn); 2777 iscsit_dec_conn_usage_count(logout_conn); 2778 } 2779 2780 cr = iscsit_get_inactive_connection_recovery_entry( 2781 conn->sess, cmd->logout_cid); 2782 if (!cr) { 2783 pr_err("Unable to locate CID: %hu for" 2784 " REMOVECONNFORRECOVERY Logout Request.\n", 2785 cmd->logout_cid); 2786 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2787 break; 2788 } 2789 2790 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2791 2792 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2793 " for recovery for CID: %hu on CID: %hu successful.\n", 2794 cmd->logout_cid, conn->cid); 2795 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2796 break; 2797 default: 2798 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2799 cmd->logout_reason); 2800 return -1; 2801 } 2802 2803 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2804 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2805 hdr->response = cmd->logout_response; 2806 hdr->itt = cmd->init_task_tag; 2807 cmd->stat_sn = conn->stat_sn++; 2808 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2809 2810 iscsit_increment_maxcmdsn(cmd, conn->sess); 2811 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2812 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2813 2814 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2815 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2816 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2817 cmd->logout_cid, conn->cid); 2818 2819 return 0; 2820 } 2821 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2822 2823 static int 2824 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2825 { 2826 struct kvec *iov; 2827 int niov = 0, tx_size, rc; 2828 2829 rc = iscsit_build_logout_rsp(cmd, conn, 2830 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2831 if (rc < 0) 2832 return rc; 2833 2834 tx_size = ISCSI_HDR_LEN; 2835 iov = &cmd->iov_misc[0]; 2836 iov[niov].iov_base = cmd->pdu; 2837 iov[niov++].iov_len = ISCSI_HDR_LEN; 2838 2839 if (conn->conn_ops->HeaderDigest) { 2840 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2841 2842 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2843 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2844 2845 iov[0].iov_len += ISCSI_CRC_LEN; 2846 tx_size += ISCSI_CRC_LEN; 2847 pr_debug("Attaching CRC32C HeaderDigest to" 2848 " Logout Response 0x%08x\n", *header_digest); 2849 } 2850 cmd->iov_misc_count = niov; 2851 cmd->tx_size = tx_size; 2852 2853 return 0; 2854 } 2855 2856 void 2857 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2858 struct iscsi_nopin *hdr, bool nopout_response) 2859 { 2860 hdr->opcode = ISCSI_OP_NOOP_IN; 2861 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2862 hton24(hdr->dlength, cmd->buf_ptr_size); 2863 if (nopout_response) 2864 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2865 hdr->itt = cmd->init_task_tag; 2866 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2867 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2868 conn->stat_sn; 2869 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2870 2871 if (nopout_response) 2872 iscsit_increment_maxcmdsn(cmd, conn->sess); 2873 2874 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2875 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2876 2877 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2878 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2879 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2880 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2881 } 2882 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2883 2884 /* 2885 * Unsolicited NOPIN, either requesting a response or not. 2886 */ 2887 static int iscsit_send_unsolicited_nopin( 2888 struct iscsi_cmd *cmd, 2889 struct iscsi_conn *conn, 2890 int want_response) 2891 { 2892 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2893 int tx_size = ISCSI_HDR_LEN, ret; 2894 2895 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2896 2897 if (conn->conn_ops->HeaderDigest) { 2898 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2899 2900 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2901 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2902 2903 tx_size += ISCSI_CRC_LEN; 2904 pr_debug("Attaching CRC32C HeaderDigest to" 2905 " NopIN 0x%08x\n", *header_digest); 2906 } 2907 2908 cmd->iov_misc[0].iov_base = cmd->pdu; 2909 cmd->iov_misc[0].iov_len = tx_size; 2910 cmd->iov_misc_count = 1; 2911 cmd->tx_size = tx_size; 2912 2913 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2914 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2915 2916 ret = iscsit_send_tx_data(cmd, conn, 1); 2917 if (ret < 0) { 2918 iscsit_tx_thread_wait_for_tcp(conn); 2919 return ret; 2920 } 2921 2922 spin_lock_bh(&cmd->istate_lock); 2923 cmd->i_state = want_response ? 2924 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2925 spin_unlock_bh(&cmd->istate_lock); 2926 2927 return 0; 2928 } 2929 2930 static int 2931 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2932 { 2933 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2934 struct kvec *iov; 2935 u32 padding = 0; 2936 int niov = 0, tx_size; 2937 2938 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2939 2940 tx_size = ISCSI_HDR_LEN; 2941 iov = &cmd->iov_misc[0]; 2942 iov[niov].iov_base = cmd->pdu; 2943 iov[niov++].iov_len = ISCSI_HDR_LEN; 2944 2945 if (conn->conn_ops->HeaderDigest) { 2946 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2947 2948 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2949 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2950 2951 iov[0].iov_len += ISCSI_CRC_LEN; 2952 tx_size += ISCSI_CRC_LEN; 2953 pr_debug("Attaching CRC32C HeaderDigest" 2954 " to NopIn 0x%08x\n", *header_digest); 2955 } 2956 2957 /* 2958 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2959 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2960 */ 2961 if (cmd->buf_ptr_size) { 2962 iov[niov].iov_base = cmd->buf_ptr; 2963 iov[niov++].iov_len = cmd->buf_ptr_size; 2964 tx_size += cmd->buf_ptr_size; 2965 2966 pr_debug("Echoing back %u bytes of ping" 2967 " data.\n", cmd->buf_ptr_size); 2968 2969 padding = ((-cmd->buf_ptr_size) & 3); 2970 if (padding != 0) { 2971 iov[niov].iov_base = &cmd->pad_bytes; 2972 iov[niov++].iov_len = padding; 2973 tx_size += padding; 2974 pr_debug("Attaching %u additional" 2975 " padding bytes.\n", padding); 2976 } 2977 if (conn->conn_ops->DataDigest) { 2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2979 cmd->buf_ptr, cmd->buf_ptr_size, 2980 padding, (u8 *)&cmd->pad_bytes, 2981 (u8 *)&cmd->data_crc); 2982 2983 iov[niov].iov_base = &cmd->data_crc; 2984 iov[niov++].iov_len = ISCSI_CRC_LEN; 2985 tx_size += ISCSI_CRC_LEN; 2986 pr_debug("Attached DataDigest for %u" 2987 " bytes of ping data, CRC 0x%08x\n", 2988 cmd->buf_ptr_size, cmd->data_crc); 2989 } 2990 } 2991 2992 cmd->iov_misc_count = niov; 2993 cmd->tx_size = tx_size; 2994 2995 return 0; 2996 } 2997 2998 static int iscsit_send_r2t( 2999 struct iscsi_cmd *cmd, 3000 struct iscsi_conn *conn) 3001 { 3002 int tx_size = 0; 3003 struct iscsi_r2t *r2t; 3004 struct iscsi_r2t_rsp *hdr; 3005 int ret; 3006 3007 r2t = iscsit_get_r2t_from_list(cmd); 3008 if (!r2t) 3009 return -1; 3010 3011 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3012 memset(hdr, 0, ISCSI_HDR_LEN); 3013 hdr->opcode = ISCSI_OP_R2T; 3014 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3015 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3016 (struct scsi_lun *)&hdr->lun); 3017 hdr->itt = cmd->init_task_tag; 3018 spin_lock_bh(&conn->sess->ttt_lock); 3019 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3020 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 3021 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3022 spin_unlock_bh(&conn->sess->ttt_lock); 3023 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3024 hdr->statsn = cpu_to_be32(conn->stat_sn); 3025 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3026 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3027 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3028 hdr->data_offset = cpu_to_be32(r2t->offset); 3029 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3030 3031 cmd->iov_misc[0].iov_base = cmd->pdu; 3032 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3033 tx_size += ISCSI_HDR_LEN; 3034 3035 if (conn->conn_ops->HeaderDigest) { 3036 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3037 3038 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3039 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3040 3041 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3042 tx_size += ISCSI_CRC_LEN; 3043 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3044 " PDU 0x%08x\n", *header_digest); 3045 } 3046 3047 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3048 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3049 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3050 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3051 r2t->offset, r2t->xfer_len, conn->cid); 3052 3053 cmd->iov_misc_count = 1; 3054 cmd->tx_size = tx_size; 3055 3056 spin_lock_bh(&cmd->r2t_lock); 3057 r2t->sent_r2t = 1; 3058 spin_unlock_bh(&cmd->r2t_lock); 3059 3060 ret = iscsit_send_tx_data(cmd, conn, 1); 3061 if (ret < 0) { 3062 iscsit_tx_thread_wait_for_tcp(conn); 3063 return ret; 3064 } 3065 3066 spin_lock_bh(&cmd->dataout_timeout_lock); 3067 iscsit_start_dataout_timer(cmd, conn); 3068 spin_unlock_bh(&cmd->dataout_timeout_lock); 3069 3070 return 0; 3071 } 3072 3073 /* 3074 * @recovery: If called from iscsi_task_reassign_complete_write() for 3075 * connection recovery. 3076 */ 3077 int iscsit_build_r2ts_for_cmd( 3078 struct iscsi_conn *conn, 3079 struct iscsi_cmd *cmd, 3080 bool recovery) 3081 { 3082 int first_r2t = 1; 3083 u32 offset = 0, xfer_len = 0; 3084 3085 spin_lock_bh(&cmd->r2t_lock); 3086 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3087 spin_unlock_bh(&cmd->r2t_lock); 3088 return 0; 3089 } 3090 3091 if (conn->sess->sess_ops->DataSequenceInOrder && 3092 !recovery) 3093 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3094 3095 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3096 if (conn->sess->sess_ops->DataSequenceInOrder) { 3097 offset = cmd->r2t_offset; 3098 3099 if (first_r2t && recovery) { 3100 int new_data_end = offset + 3101 conn->sess->sess_ops->MaxBurstLength - 3102 cmd->next_burst_len; 3103 3104 if (new_data_end > cmd->se_cmd.data_length) 3105 xfer_len = cmd->se_cmd.data_length - offset; 3106 else 3107 xfer_len = 3108 conn->sess->sess_ops->MaxBurstLength - 3109 cmd->next_burst_len; 3110 } else { 3111 int new_data_end = offset + 3112 conn->sess->sess_ops->MaxBurstLength; 3113 3114 if (new_data_end > cmd->se_cmd.data_length) 3115 xfer_len = cmd->se_cmd.data_length - offset; 3116 else 3117 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3118 } 3119 cmd->r2t_offset += xfer_len; 3120 3121 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3122 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3123 } else { 3124 struct iscsi_seq *seq; 3125 3126 seq = iscsit_get_seq_holder_for_r2t(cmd); 3127 if (!seq) { 3128 spin_unlock_bh(&cmd->r2t_lock); 3129 return -1; 3130 } 3131 3132 offset = seq->offset; 3133 xfer_len = seq->xfer_len; 3134 3135 if (cmd->seq_send_order == cmd->seq_count) 3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3137 } 3138 cmd->outstanding_r2ts++; 3139 first_r2t = 0; 3140 3141 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3142 spin_unlock_bh(&cmd->r2t_lock); 3143 return -1; 3144 } 3145 3146 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3147 break; 3148 } 3149 spin_unlock_bh(&cmd->r2t_lock); 3150 3151 return 0; 3152 } 3153 3154 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3155 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3156 { 3157 if (inc_stat_sn) 3158 cmd->stat_sn = conn->stat_sn++; 3159 3160 spin_lock_bh(&conn->sess->session_stats_lock); 3161 conn->sess->rsp_pdus++; 3162 spin_unlock_bh(&conn->sess->session_stats_lock); 3163 3164 memset(hdr, 0, ISCSI_HDR_LEN); 3165 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3166 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3167 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3168 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3169 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3170 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3171 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3172 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3173 } 3174 hdr->response = cmd->iscsi_response; 3175 hdr->cmd_status = cmd->se_cmd.scsi_status; 3176 hdr->itt = cmd->init_task_tag; 3177 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3178 3179 iscsit_increment_maxcmdsn(cmd, conn->sess); 3180 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3181 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3182 3183 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3184 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3185 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3186 cmd->se_cmd.scsi_status, conn->cid); 3187 } 3188 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3189 3190 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3191 { 3192 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3193 struct kvec *iov; 3194 u32 padding = 0, tx_size = 0; 3195 int iov_count = 0; 3196 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3197 3198 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3199 3200 iov = &cmd->iov_misc[0]; 3201 iov[iov_count].iov_base = cmd->pdu; 3202 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3203 tx_size += ISCSI_HDR_LEN; 3204 3205 /* 3206 * Attach SENSE DATA payload to iSCSI Response PDU 3207 */ 3208 if (cmd->se_cmd.sense_buffer && 3209 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3210 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3211 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3212 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3213 3214 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3215 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3216 iov[iov_count].iov_base = cmd->sense_buffer; 3217 iov[iov_count++].iov_len = 3218 (cmd->se_cmd.scsi_sense_length + padding); 3219 tx_size += cmd->se_cmd.scsi_sense_length; 3220 3221 if (padding) { 3222 memset(cmd->sense_buffer + 3223 cmd->se_cmd.scsi_sense_length, 0, padding); 3224 tx_size += padding; 3225 pr_debug("Adding %u bytes of padding to" 3226 " SENSE.\n", padding); 3227 } 3228 3229 if (conn->conn_ops->DataDigest) { 3230 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3231 cmd->sense_buffer, 3232 (cmd->se_cmd.scsi_sense_length + padding), 3233 0, NULL, (u8 *)&cmd->data_crc); 3234 3235 iov[iov_count].iov_base = &cmd->data_crc; 3236 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3237 tx_size += ISCSI_CRC_LEN; 3238 3239 pr_debug("Attaching CRC32 DataDigest for" 3240 " SENSE, %u bytes CRC 0x%08x\n", 3241 (cmd->se_cmd.scsi_sense_length + padding), 3242 cmd->data_crc); 3243 } 3244 3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3246 " Response PDU\n", 3247 cmd->se_cmd.scsi_sense_length); 3248 } 3249 3250 if (conn->conn_ops->HeaderDigest) { 3251 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3252 3253 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3254 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3255 3256 iov[0].iov_len += ISCSI_CRC_LEN; 3257 tx_size += ISCSI_CRC_LEN; 3258 pr_debug("Attaching CRC32 HeaderDigest for Response" 3259 " PDU 0x%08x\n", *header_digest); 3260 } 3261 3262 cmd->iov_misc_count = iov_count; 3263 cmd->tx_size = tx_size; 3264 3265 return 0; 3266 } 3267 3268 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3269 { 3270 switch (se_tmr->response) { 3271 case TMR_FUNCTION_COMPLETE: 3272 return ISCSI_TMF_RSP_COMPLETE; 3273 case TMR_TASK_DOES_NOT_EXIST: 3274 return ISCSI_TMF_RSP_NO_TASK; 3275 case TMR_LUN_DOES_NOT_EXIST: 3276 return ISCSI_TMF_RSP_NO_LUN; 3277 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3278 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3279 case TMR_FUNCTION_REJECTED: 3280 default: 3281 return ISCSI_TMF_RSP_REJECTED; 3282 } 3283 } 3284 3285 void 3286 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3287 struct iscsi_tm_rsp *hdr) 3288 { 3289 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3290 3291 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3292 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3293 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3294 hdr->itt = cmd->init_task_tag; 3295 cmd->stat_sn = conn->stat_sn++; 3296 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3297 3298 iscsit_increment_maxcmdsn(cmd, conn->sess); 3299 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3300 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3301 3302 pr_debug("Built Task Management Response ITT: 0x%08x," 3303 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3304 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3305 } 3306 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3307 3308 static int 3309 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3310 { 3311 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3312 u32 tx_size = 0; 3313 3314 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3315 3316 cmd->iov_misc[0].iov_base = cmd->pdu; 3317 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3318 tx_size += ISCSI_HDR_LEN; 3319 3320 if (conn->conn_ops->HeaderDigest) { 3321 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3322 3323 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3324 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3325 3326 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3327 tx_size += ISCSI_CRC_LEN; 3328 pr_debug("Attaching CRC32 HeaderDigest for Task" 3329 " Mgmt Response PDU 0x%08x\n", *header_digest); 3330 } 3331 3332 cmd->iov_misc_count = 1; 3333 cmd->tx_size = tx_size; 3334 3335 return 0; 3336 } 3337 3338 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3339 { 3340 bool ret = false; 3341 3342 if (np->np_sockaddr.ss_family == AF_INET6) { 3343 const struct sockaddr_in6 sin6 = { 3344 .sin6_addr = IN6ADDR_ANY_INIT }; 3345 struct sockaddr_in6 *sock_in6 = 3346 (struct sockaddr_in6 *)&np->np_sockaddr; 3347 3348 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3349 sin6.sin6_addr.s6_addr, 16)) 3350 ret = true; 3351 } else { 3352 struct sockaddr_in * sock_in = 3353 (struct sockaddr_in *)&np->np_sockaddr; 3354 3355 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3356 ret = true; 3357 } 3358 3359 return ret; 3360 } 3361 3362 #define SENDTARGETS_BUF_LIMIT 32768U 3363 3364 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) 3365 { 3366 char *payload = NULL; 3367 struct iscsi_conn *conn = cmd->conn; 3368 struct iscsi_portal_group *tpg; 3369 struct iscsi_tiqn *tiqn; 3370 struct iscsi_tpg_np *tpg_np; 3371 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3372 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3373 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3374 3375 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3376 SENDTARGETS_BUF_LIMIT); 3377 3378 payload = kzalloc(buffer_len, GFP_KERNEL); 3379 if (!payload) { 3380 pr_err("Unable to allocate memory for sendtargets" 3381 " response.\n"); 3382 return -ENOMEM; 3383 } 3384 /* 3385 * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE 3386 * explicit case.. 3387 */ 3388 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) { 3389 text_ptr = strchr(text_in, '='); 3390 if (!text_ptr) { 3391 pr_err("Unable to locate '=' string in text_in:" 3392 " %s\n", text_in); 3393 kfree(payload); 3394 return -EINVAL; 3395 } 3396 /* 3397 * Skip over '=' character.. 3398 */ 3399 text_ptr += 1; 3400 } 3401 3402 spin_lock(&tiqn_lock); 3403 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3404 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) && 3405 strcmp(tiqn->tiqn, text_ptr)) { 3406 continue; 3407 } 3408 3409 len = sprintf(buf, "TargetName=%s", tiqn->tiqn); 3410 len += 1; 3411 3412 if ((len + payload_len) > buffer_len) { 3413 end_of_buf = 1; 3414 goto eob; 3415 } 3416 memcpy(payload + payload_len, buf, len); 3417 payload_len += len; 3418 3419 spin_lock(&tiqn->tiqn_tpg_lock); 3420 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3421 3422 spin_lock(&tpg->tpg_state_lock); 3423 if ((tpg->tpg_state == TPG_STATE_FREE) || 3424 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3425 spin_unlock(&tpg->tpg_state_lock); 3426 continue; 3427 } 3428 spin_unlock(&tpg->tpg_state_lock); 3429 3430 spin_lock(&tpg->tpg_np_lock); 3431 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3432 tpg_np_list) { 3433 struct iscsi_np *np = tpg_np->tpg_np; 3434 bool inaddr_any = iscsit_check_inaddr_any(np); 3435 3436 len = sprintf(buf, "TargetAddress=" 3437 "%s:%hu,%hu", 3438 (inaddr_any == false) ? 3439 np->np_ip : conn->local_ip, 3440 (inaddr_any == false) ? 3441 np->np_port : conn->local_port, 3442 tpg->tpgt); 3443 len += 1; 3444 3445 if ((len + payload_len) > buffer_len) { 3446 spin_unlock(&tpg->tpg_np_lock); 3447 spin_unlock(&tiqn->tiqn_tpg_lock); 3448 end_of_buf = 1; 3449 goto eob; 3450 } 3451 memcpy(payload + payload_len, buf, len); 3452 payload_len += len; 3453 } 3454 spin_unlock(&tpg->tpg_np_lock); 3455 } 3456 spin_unlock(&tiqn->tiqn_tpg_lock); 3457 eob: 3458 if (end_of_buf) 3459 break; 3460 3461 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) 3462 break; 3463 } 3464 spin_unlock(&tiqn_lock); 3465 3466 cmd->buf_ptr = payload; 3467 3468 return payload_len; 3469 } 3470 3471 int 3472 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3473 struct iscsi_text_rsp *hdr) 3474 { 3475 int text_length, padding; 3476 3477 text_length = iscsit_build_sendtargets_response(cmd); 3478 if (text_length < 0) 3479 return text_length; 3480 3481 hdr->opcode = ISCSI_OP_TEXT_RSP; 3482 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3483 padding = ((-text_length) & 3); 3484 hton24(hdr->dlength, text_length); 3485 hdr->itt = cmd->init_task_tag; 3486 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3487 cmd->stat_sn = conn->stat_sn++; 3488 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3489 3490 iscsit_increment_maxcmdsn(cmd, conn->sess); 3491 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3492 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3493 3494 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3495 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3496 text_length, conn->cid); 3497 3498 return text_length + padding; 3499 } 3500 EXPORT_SYMBOL(iscsit_build_text_rsp); 3501 3502 /* 3503 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3504 * MaxRecvDataSegmentLength. 3505 */ 3506 static int iscsit_send_text_rsp( 3507 struct iscsi_cmd *cmd, 3508 struct iscsi_conn *conn) 3509 { 3510 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3511 struct kvec *iov; 3512 u32 tx_size = 0; 3513 int text_length, iov_count = 0, rc; 3514 3515 rc = iscsit_build_text_rsp(cmd, conn, hdr); 3516 if (rc < 0) 3517 return rc; 3518 3519 text_length = rc; 3520 iov = &cmd->iov_misc[0]; 3521 iov[iov_count].iov_base = cmd->pdu; 3522 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3523 iov[iov_count].iov_base = cmd->buf_ptr; 3524 iov[iov_count++].iov_len = text_length; 3525 3526 tx_size += (ISCSI_HDR_LEN + text_length); 3527 3528 if (conn->conn_ops->HeaderDigest) { 3529 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3530 3531 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3532 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3533 3534 iov[0].iov_len += ISCSI_CRC_LEN; 3535 tx_size += ISCSI_CRC_LEN; 3536 pr_debug("Attaching CRC32 HeaderDigest for" 3537 " Text Response PDU 0x%08x\n", *header_digest); 3538 } 3539 3540 if (conn->conn_ops->DataDigest) { 3541 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3542 cmd->buf_ptr, text_length, 3543 0, NULL, (u8 *)&cmd->data_crc); 3544 3545 iov[iov_count].iov_base = &cmd->data_crc; 3546 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3547 tx_size += ISCSI_CRC_LEN; 3548 3549 pr_debug("Attaching DataDigest for %u bytes of text" 3550 " data, CRC 0x%08x\n", text_length, 3551 cmd->data_crc); 3552 } 3553 3554 cmd->iov_misc_count = iov_count; 3555 cmd->tx_size = tx_size; 3556 3557 return 0; 3558 } 3559 3560 void 3561 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3562 struct iscsi_reject *hdr) 3563 { 3564 hdr->opcode = ISCSI_OP_REJECT; 3565 hdr->reason = cmd->reject_reason; 3566 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3567 hton24(hdr->dlength, ISCSI_HDR_LEN); 3568 hdr->ffffffff = cpu_to_be32(0xffffffff); 3569 cmd->stat_sn = conn->stat_sn++; 3570 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3571 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3572 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3573 3574 } 3575 EXPORT_SYMBOL(iscsit_build_reject); 3576 3577 static int iscsit_send_reject( 3578 struct iscsi_cmd *cmd, 3579 struct iscsi_conn *conn) 3580 { 3581 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3582 struct kvec *iov; 3583 u32 iov_count = 0, tx_size; 3584 3585 iscsit_build_reject(cmd, conn, hdr); 3586 3587 iov = &cmd->iov_misc[0]; 3588 iov[iov_count].iov_base = cmd->pdu; 3589 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3590 iov[iov_count].iov_base = cmd->buf_ptr; 3591 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3592 3593 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3594 3595 if (conn->conn_ops->HeaderDigest) { 3596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3597 3598 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3599 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3600 3601 iov[0].iov_len += ISCSI_CRC_LEN; 3602 tx_size += ISCSI_CRC_LEN; 3603 pr_debug("Attaching CRC32 HeaderDigest for" 3604 " REJECT PDU 0x%08x\n", *header_digest); 3605 } 3606 3607 if (conn->conn_ops->DataDigest) { 3608 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3609 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3610 3611 iov[iov_count].iov_base = &cmd->data_crc; 3612 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3613 tx_size += ISCSI_CRC_LEN; 3614 pr_debug("Attaching CRC32 DataDigest for REJECT" 3615 " PDU 0x%08x\n", cmd->data_crc); 3616 } 3617 3618 cmd->iov_misc_count = iov_count; 3619 cmd->tx_size = tx_size; 3620 3621 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3622 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3623 3624 return 0; 3625 } 3626 3627 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3628 { 3629 struct iscsi_thread_set *ts = conn->thread_set; 3630 int ord, cpu; 3631 /* 3632 * thread_id is assigned from iscsit_global->ts_bitmap from 3633 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3634 * 3635 * Here we use thread_id to determine which CPU that this 3636 * iSCSI connection's iscsi_thread_set will be scheduled to 3637 * execute upon. 3638 */ 3639 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3640 for_each_online_cpu(cpu) { 3641 if (ord-- == 0) { 3642 cpumask_set_cpu(cpu, conn->conn_cpumask); 3643 return; 3644 } 3645 } 3646 /* 3647 * This should never be reached.. 3648 */ 3649 dump_stack(); 3650 cpumask_setall(conn->conn_cpumask); 3651 } 3652 3653 static inline void iscsit_thread_check_cpumask( 3654 struct iscsi_conn *conn, 3655 struct task_struct *p, 3656 int mode) 3657 { 3658 char buf[128]; 3659 /* 3660 * mode == 1 signals iscsi_target_tx_thread() usage. 3661 * mode == 0 signals iscsi_target_rx_thread() usage. 3662 */ 3663 if (mode == 1) { 3664 if (!conn->conn_tx_reset_cpumask) 3665 return; 3666 conn->conn_tx_reset_cpumask = 0; 3667 } else { 3668 if (!conn->conn_rx_reset_cpumask) 3669 return; 3670 conn->conn_rx_reset_cpumask = 0; 3671 } 3672 /* 3673 * Update the CPU mask for this single kthread so that 3674 * both TX and RX kthreads are scheduled to run on the 3675 * same CPU. 3676 */ 3677 memset(buf, 0, 128); 3678 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3679 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3680 } 3681 3682 static int 3683 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3684 { 3685 int ret; 3686 3687 switch (state) { 3688 case ISTATE_SEND_R2T: 3689 ret = iscsit_send_r2t(cmd, conn); 3690 if (ret < 0) 3691 goto err; 3692 break; 3693 case ISTATE_REMOVE: 3694 spin_lock_bh(&conn->cmd_lock); 3695 list_del(&cmd->i_conn_node); 3696 spin_unlock_bh(&conn->cmd_lock); 3697 3698 iscsit_free_cmd(cmd, false); 3699 break; 3700 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3701 iscsit_mod_nopin_response_timer(conn); 3702 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3703 if (ret < 0) 3704 goto err; 3705 break; 3706 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3707 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3708 if (ret < 0) 3709 goto err; 3710 break; 3711 default: 3712 pr_err("Unknown Opcode: 0x%02x ITT:" 3713 " 0x%08x, i_state: %d on CID: %hu\n", 3714 cmd->iscsi_opcode, cmd->init_task_tag, state, 3715 conn->cid); 3716 goto err; 3717 } 3718 3719 return 0; 3720 3721 err: 3722 return -1; 3723 } 3724 3725 static int 3726 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3727 { 3728 struct iscsit_transport *t = conn->conn_transport; 3729 struct iscsi_queue_req *qr; 3730 struct iscsi_cmd *cmd; 3731 u8 state; 3732 int ret; 3733 3734 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3735 atomic_set(&conn->check_immediate_queue, 0); 3736 cmd = qr->cmd; 3737 state = qr->state; 3738 kmem_cache_free(lio_qr_cache, qr); 3739 3740 ret = t->iscsit_immediate_queue(conn, cmd, state); 3741 if (ret < 0) 3742 return ret; 3743 } 3744 3745 return 0; 3746 } 3747 3748 static int 3749 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3750 { 3751 int ret; 3752 3753 check_rsp_state: 3754 switch (state) { 3755 case ISTATE_SEND_DATAIN: 3756 ret = iscsit_send_datain(cmd, conn); 3757 if (ret < 0) 3758 goto err; 3759 else if (!ret) 3760 /* more drs */ 3761 goto check_rsp_state; 3762 else if (ret == 1) { 3763 /* all done */ 3764 spin_lock_bh(&cmd->istate_lock); 3765 cmd->i_state = ISTATE_SENT_STATUS; 3766 spin_unlock_bh(&cmd->istate_lock); 3767 3768 if (atomic_read(&conn->check_immediate_queue)) 3769 return 1; 3770 3771 return 0; 3772 } else if (ret == 2) { 3773 /* Still must send status, 3774 SCF_TRANSPORT_TASK_SENSE was set */ 3775 spin_lock_bh(&cmd->istate_lock); 3776 cmd->i_state = ISTATE_SEND_STATUS; 3777 spin_unlock_bh(&cmd->istate_lock); 3778 state = ISTATE_SEND_STATUS; 3779 goto check_rsp_state; 3780 } 3781 3782 break; 3783 case ISTATE_SEND_STATUS: 3784 case ISTATE_SEND_STATUS_RECOVERY: 3785 ret = iscsit_send_response(cmd, conn); 3786 break; 3787 case ISTATE_SEND_LOGOUTRSP: 3788 ret = iscsit_send_logout(cmd, conn); 3789 break; 3790 case ISTATE_SEND_ASYNCMSG: 3791 ret = iscsit_send_conn_drop_async_message( 3792 cmd, conn); 3793 break; 3794 case ISTATE_SEND_NOPIN: 3795 ret = iscsit_send_nopin(cmd, conn); 3796 break; 3797 case ISTATE_SEND_REJECT: 3798 ret = iscsit_send_reject(cmd, conn); 3799 break; 3800 case ISTATE_SEND_TASKMGTRSP: 3801 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3802 if (ret != 0) 3803 break; 3804 ret = iscsit_tmr_post_handler(cmd, conn); 3805 if (ret != 0) 3806 iscsit_fall_back_to_erl0(conn->sess); 3807 break; 3808 case ISTATE_SEND_TEXTRSP: 3809 ret = iscsit_send_text_rsp(cmd, conn); 3810 break; 3811 default: 3812 pr_err("Unknown Opcode: 0x%02x ITT:" 3813 " 0x%08x, i_state: %d on CID: %hu\n", 3814 cmd->iscsi_opcode, cmd->init_task_tag, 3815 state, conn->cid); 3816 goto err; 3817 } 3818 if (ret < 0) 3819 goto err; 3820 3821 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3822 iscsit_tx_thread_wait_for_tcp(conn); 3823 iscsit_unmap_iovec(cmd); 3824 goto err; 3825 } 3826 iscsit_unmap_iovec(cmd); 3827 3828 switch (state) { 3829 case ISTATE_SEND_LOGOUTRSP: 3830 if (!iscsit_logout_post_handler(cmd, conn)) 3831 goto restart; 3832 /* fall through */ 3833 case ISTATE_SEND_STATUS: 3834 case ISTATE_SEND_ASYNCMSG: 3835 case ISTATE_SEND_NOPIN: 3836 case ISTATE_SEND_STATUS_RECOVERY: 3837 case ISTATE_SEND_TEXTRSP: 3838 case ISTATE_SEND_TASKMGTRSP: 3839 case ISTATE_SEND_REJECT: 3840 spin_lock_bh(&cmd->istate_lock); 3841 cmd->i_state = ISTATE_SENT_STATUS; 3842 spin_unlock_bh(&cmd->istate_lock); 3843 break; 3844 default: 3845 pr_err("Unknown Opcode: 0x%02x ITT:" 3846 " 0x%08x, i_state: %d on CID: %hu\n", 3847 cmd->iscsi_opcode, cmd->init_task_tag, 3848 cmd->i_state, conn->cid); 3849 goto err; 3850 } 3851 3852 if (atomic_read(&conn->check_immediate_queue)) 3853 return 1; 3854 3855 return 0; 3856 3857 err: 3858 return -1; 3859 restart: 3860 return -EAGAIN; 3861 } 3862 3863 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3864 { 3865 struct iscsit_transport *t = conn->conn_transport; 3866 struct iscsi_queue_req *qr; 3867 struct iscsi_cmd *cmd; 3868 u8 state; 3869 int ret; 3870 3871 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3872 cmd = qr->cmd; 3873 state = qr->state; 3874 kmem_cache_free(lio_qr_cache, qr); 3875 3876 ret = t->iscsit_response_queue(conn, cmd, state); 3877 if (ret == 1 || ret < 0) 3878 return ret; 3879 } 3880 3881 return 0; 3882 } 3883 3884 int iscsi_target_tx_thread(void *arg) 3885 { 3886 int ret = 0; 3887 struct iscsi_conn *conn; 3888 struct iscsi_thread_set *ts = arg; 3889 /* 3890 * Allow ourselves to be interrupted by SIGINT so that a 3891 * connection recovery / failure event can be triggered externally. 3892 */ 3893 allow_signal(SIGINT); 3894 3895 restart: 3896 conn = iscsi_tx_thread_pre_handler(ts); 3897 if (!conn) 3898 goto out; 3899 3900 ret = 0; 3901 3902 while (!kthread_should_stop()) { 3903 /* 3904 * Ensure that both TX and RX per connection kthreads 3905 * are scheduled to run on the same CPU. 3906 */ 3907 iscsit_thread_check_cpumask(conn, current, 1); 3908 3909 wait_event_interruptible(conn->queues_wq, 3910 !iscsit_conn_all_queues_empty(conn) || 3911 ts->status == ISCSI_THREAD_SET_RESET); 3912 3913 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3914 signal_pending(current)) 3915 goto transport_err; 3916 3917 get_immediate: 3918 ret = iscsit_handle_immediate_queue(conn); 3919 if (ret < 0) 3920 goto transport_err; 3921 3922 ret = iscsit_handle_response_queue(conn); 3923 if (ret == 1) 3924 goto get_immediate; 3925 else if (ret == -EAGAIN) 3926 goto restart; 3927 else if (ret < 0) 3928 goto transport_err; 3929 } 3930 3931 transport_err: 3932 iscsit_take_action_for_connection_exit(conn); 3933 goto restart; 3934 out: 3935 return 0; 3936 } 3937 3938 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3939 { 3940 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3941 struct iscsi_cmd *cmd; 3942 int ret = 0; 3943 3944 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3945 case ISCSI_OP_SCSI_CMD: 3946 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3947 if (!cmd) 3948 goto reject; 3949 3950 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3951 break; 3952 case ISCSI_OP_SCSI_DATA_OUT: 3953 ret = iscsit_handle_data_out(conn, buf); 3954 break; 3955 case ISCSI_OP_NOOP_OUT: 3956 cmd = NULL; 3957 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3958 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3959 if (!cmd) 3960 goto reject; 3961 } 3962 ret = iscsit_handle_nop_out(conn, cmd, buf); 3963 break; 3964 case ISCSI_OP_SCSI_TMFUNC: 3965 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3966 if (!cmd) 3967 goto reject; 3968 3969 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3970 break; 3971 case ISCSI_OP_TEXT: 3972 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3973 if (!cmd) 3974 goto reject; 3975 3976 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3977 break; 3978 case ISCSI_OP_LOGOUT: 3979 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3980 if (!cmd) 3981 goto reject; 3982 3983 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3984 if (ret > 0) 3985 wait_for_completion_timeout(&conn->conn_logout_comp, 3986 SECONDS_FOR_LOGOUT_COMP * HZ); 3987 break; 3988 case ISCSI_OP_SNACK: 3989 ret = iscsit_handle_snack(conn, buf); 3990 break; 3991 default: 3992 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3993 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3994 pr_err("Cannot recover from unknown" 3995 " opcode while ERL=0, closing iSCSI connection.\n"); 3996 return -1; 3997 } 3998 if (!conn->conn_ops->OFMarker) { 3999 pr_err("Unable to recover from unknown" 4000 " opcode while OFMarker=No, closing iSCSI" 4001 " connection.\n"); 4002 return -1; 4003 } 4004 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 4005 pr_err("Unable to recover from unknown" 4006 " opcode, closing iSCSI connection.\n"); 4007 return -1; 4008 } 4009 break; 4010 } 4011 4012 return ret; 4013 reject: 4014 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4015 } 4016 4017 int iscsi_target_rx_thread(void *arg) 4018 { 4019 int ret; 4020 u8 buffer[ISCSI_HDR_LEN], opcode; 4021 u32 checksum = 0, digest = 0; 4022 struct iscsi_conn *conn = NULL; 4023 struct iscsi_thread_set *ts = arg; 4024 struct kvec iov; 4025 /* 4026 * Allow ourselves to be interrupted by SIGINT so that a 4027 * connection recovery / failure event can be triggered externally. 4028 */ 4029 allow_signal(SIGINT); 4030 4031 restart: 4032 conn = iscsi_rx_thread_pre_handler(ts); 4033 if (!conn) 4034 goto out; 4035 4036 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4037 struct completion comp; 4038 int rc; 4039 4040 init_completion(&comp); 4041 rc = wait_for_completion_interruptible(&comp); 4042 if (rc < 0) 4043 goto transport_err; 4044 4045 goto out; 4046 } 4047 4048 while (!kthread_should_stop()) { 4049 /* 4050 * Ensure that both TX and RX per connection kthreads 4051 * are scheduled to run on the same CPU. 4052 */ 4053 iscsit_thread_check_cpumask(conn, current, 0); 4054 4055 memset(buffer, 0, ISCSI_HDR_LEN); 4056 memset(&iov, 0, sizeof(struct kvec)); 4057 4058 iov.iov_base = buffer; 4059 iov.iov_len = ISCSI_HDR_LEN; 4060 4061 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4062 if (ret != ISCSI_HDR_LEN) { 4063 iscsit_rx_thread_wait_for_tcp(conn); 4064 goto transport_err; 4065 } 4066 4067 if (conn->conn_ops->HeaderDigest) { 4068 iov.iov_base = &digest; 4069 iov.iov_len = ISCSI_CRC_LEN; 4070 4071 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4072 if (ret != ISCSI_CRC_LEN) { 4073 iscsit_rx_thread_wait_for_tcp(conn); 4074 goto transport_err; 4075 } 4076 4077 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4078 buffer, ISCSI_HDR_LEN, 4079 0, NULL, (u8 *)&checksum); 4080 4081 if (digest != checksum) { 4082 pr_err("HeaderDigest CRC32C failed," 4083 " received 0x%08x, computed 0x%08x\n", 4084 digest, checksum); 4085 /* 4086 * Set the PDU to 0xff so it will intentionally 4087 * hit default in the switch below. 4088 */ 4089 memset(buffer, 0xff, ISCSI_HDR_LEN); 4090 spin_lock_bh(&conn->sess->session_stats_lock); 4091 conn->sess->conn_digest_errors++; 4092 spin_unlock_bh(&conn->sess->session_stats_lock); 4093 } else { 4094 pr_debug("Got HeaderDigest CRC32C" 4095 " 0x%08x\n", checksum); 4096 } 4097 } 4098 4099 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4100 goto transport_err; 4101 4102 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4103 4104 if (conn->sess->sess_ops->SessionType && 4105 ((!(opcode & ISCSI_OP_TEXT)) || 4106 (!(opcode & ISCSI_OP_LOGOUT)))) { 4107 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4108 " while in Discovery Session, rejecting.\n", opcode); 4109 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4110 buffer); 4111 goto transport_err; 4112 } 4113 4114 ret = iscsi_target_rx_opcode(conn, buffer); 4115 if (ret < 0) 4116 goto transport_err; 4117 } 4118 4119 transport_err: 4120 if (!signal_pending(current)) 4121 atomic_set(&conn->transport_failed, 1); 4122 iscsit_take_action_for_connection_exit(conn); 4123 goto restart; 4124 out: 4125 return 0; 4126 } 4127 4128 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4129 { 4130 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4131 struct iscsi_session *sess = conn->sess; 4132 /* 4133 * We expect this function to only ever be called from either RX or TX 4134 * thread context via iscsit_close_connection() once the other context 4135 * has been reset -> returned sleeping pre-handler state. 4136 */ 4137 spin_lock_bh(&conn->cmd_lock); 4138 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4139 4140 list_del(&cmd->i_conn_node); 4141 spin_unlock_bh(&conn->cmd_lock); 4142 4143 iscsit_increment_maxcmdsn(cmd, sess); 4144 4145 iscsit_free_cmd(cmd, true); 4146 4147 spin_lock_bh(&conn->cmd_lock); 4148 } 4149 spin_unlock_bh(&conn->cmd_lock); 4150 } 4151 4152 static void iscsit_stop_timers_for_cmds( 4153 struct iscsi_conn *conn) 4154 { 4155 struct iscsi_cmd *cmd; 4156 4157 spin_lock_bh(&conn->cmd_lock); 4158 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4159 if (cmd->data_direction == DMA_TO_DEVICE) 4160 iscsit_stop_dataout_timer(cmd); 4161 } 4162 spin_unlock_bh(&conn->cmd_lock); 4163 } 4164 4165 int iscsit_close_connection( 4166 struct iscsi_conn *conn) 4167 { 4168 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4169 struct iscsi_session *sess = conn->sess; 4170 4171 pr_debug("Closing iSCSI connection CID %hu on SID:" 4172 " %u\n", conn->cid, sess->sid); 4173 /* 4174 * Always up conn_logout_comp just in case the RX Thread is sleeping 4175 * and the logout response never got sent because the connection 4176 * failed. 4177 */ 4178 complete(&conn->conn_logout_comp); 4179 4180 iscsi_release_thread_set(conn); 4181 4182 iscsit_stop_timers_for_cmds(conn); 4183 iscsit_stop_nopin_response_timer(conn); 4184 iscsit_stop_nopin_timer(conn); 4185 iscsit_free_queue_reqs_for_conn(conn); 4186 4187 /* 4188 * During Connection recovery drop unacknowledged out of order 4189 * commands for this connection, and prepare the other commands 4190 * for realligence. 4191 * 4192 * During normal operation clear the out of order commands (but 4193 * do not free the struct iscsi_ooo_cmdsn's) and release all 4194 * struct iscsi_cmds. 4195 */ 4196 if (atomic_read(&conn->connection_recovery)) { 4197 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4198 iscsit_prepare_cmds_for_realligance(conn); 4199 } else { 4200 iscsit_clear_ooo_cmdsns_for_conn(conn); 4201 iscsit_release_commands_from_conn(conn); 4202 } 4203 4204 /* 4205 * Handle decrementing session or connection usage count if 4206 * a logout response was not able to be sent because the 4207 * connection failed. Fall back to Session Recovery here. 4208 */ 4209 if (atomic_read(&conn->conn_logout_remove)) { 4210 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4211 iscsit_dec_conn_usage_count(conn); 4212 iscsit_dec_session_usage_count(sess); 4213 } 4214 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4215 iscsit_dec_conn_usage_count(conn); 4216 4217 atomic_set(&conn->conn_logout_remove, 0); 4218 atomic_set(&sess->session_reinstatement, 0); 4219 atomic_set(&sess->session_fall_back_to_erl0, 1); 4220 } 4221 4222 spin_lock_bh(&sess->conn_lock); 4223 list_del(&conn->conn_list); 4224 4225 /* 4226 * Attempt to let the Initiator know this connection failed by 4227 * sending an Connection Dropped Async Message on another 4228 * active connection. 4229 */ 4230 if (atomic_read(&conn->connection_recovery)) 4231 iscsit_build_conn_drop_async_message(conn); 4232 4233 spin_unlock_bh(&sess->conn_lock); 4234 4235 /* 4236 * If connection reinstatement is being performed on this connection, 4237 * up the connection reinstatement semaphore that is being blocked on 4238 * in iscsit_cause_connection_reinstatement(). 4239 */ 4240 spin_lock_bh(&conn->state_lock); 4241 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4242 spin_unlock_bh(&conn->state_lock); 4243 complete(&conn->conn_wait_comp); 4244 wait_for_completion(&conn->conn_post_wait_comp); 4245 spin_lock_bh(&conn->state_lock); 4246 } 4247 4248 /* 4249 * If connection reinstatement is being performed on this connection 4250 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4251 * connection wait rcfr semaphore that is being blocked on 4252 * an iscsit_connection_reinstatement_rcfr(). 4253 */ 4254 if (atomic_read(&conn->connection_wait_rcfr)) { 4255 spin_unlock_bh(&conn->state_lock); 4256 complete(&conn->conn_wait_rcfr_comp); 4257 wait_for_completion(&conn->conn_post_wait_comp); 4258 spin_lock_bh(&conn->state_lock); 4259 } 4260 atomic_set(&conn->connection_reinstatement, 1); 4261 spin_unlock_bh(&conn->state_lock); 4262 4263 /* 4264 * If any other processes are accessing this connection pointer we 4265 * must wait until they have completed. 4266 */ 4267 iscsit_check_conn_usage_count(conn); 4268 4269 if (conn->conn_rx_hash.tfm) 4270 crypto_free_hash(conn->conn_rx_hash.tfm); 4271 if (conn->conn_tx_hash.tfm) 4272 crypto_free_hash(conn->conn_tx_hash.tfm); 4273 4274 if (conn->conn_cpumask) 4275 free_cpumask_var(conn->conn_cpumask); 4276 4277 kfree(conn->conn_ops); 4278 conn->conn_ops = NULL; 4279 4280 if (conn->sock) 4281 sock_release(conn->sock); 4282 4283 if (conn->conn_transport->iscsit_free_conn) 4284 conn->conn_transport->iscsit_free_conn(conn); 4285 4286 iscsit_put_transport(conn->conn_transport); 4287 4288 conn->thread_set = NULL; 4289 4290 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4291 conn->conn_state = TARG_CONN_STATE_FREE; 4292 kfree(conn); 4293 4294 spin_lock_bh(&sess->conn_lock); 4295 atomic_dec(&sess->nconn); 4296 pr_debug("Decremented iSCSI connection count to %hu from node:" 4297 " %s\n", atomic_read(&sess->nconn), 4298 sess->sess_ops->InitiatorName); 4299 /* 4300 * Make sure that if one connection fails in an non ERL=2 iSCSI 4301 * Session that they all fail. 4302 */ 4303 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4304 !atomic_read(&sess->session_logout)) 4305 atomic_set(&sess->session_fall_back_to_erl0, 1); 4306 4307 /* 4308 * If this was not the last connection in the session, and we are 4309 * performing session reinstatement or falling back to ERL=0, call 4310 * iscsit_stop_session() without sleeping to shutdown the other 4311 * active connections. 4312 */ 4313 if (atomic_read(&sess->nconn)) { 4314 if (!atomic_read(&sess->session_reinstatement) && 4315 !atomic_read(&sess->session_fall_back_to_erl0)) { 4316 spin_unlock_bh(&sess->conn_lock); 4317 return 0; 4318 } 4319 if (!atomic_read(&sess->session_stop_active)) { 4320 atomic_set(&sess->session_stop_active, 1); 4321 spin_unlock_bh(&sess->conn_lock); 4322 iscsit_stop_session(sess, 0, 0); 4323 return 0; 4324 } 4325 spin_unlock_bh(&sess->conn_lock); 4326 return 0; 4327 } 4328 4329 /* 4330 * If this was the last connection in the session and one of the 4331 * following is occurring: 4332 * 4333 * Session Reinstatement is not being performed, and are falling back 4334 * to ERL=0 call iscsit_close_session(). 4335 * 4336 * Session Logout was requested. iscsit_close_session() will be called 4337 * elsewhere. 4338 * 4339 * Session Continuation is not being performed, start the Time2Retain 4340 * handler and check if sleep_on_sess_wait_sem is active. 4341 */ 4342 if (!atomic_read(&sess->session_reinstatement) && 4343 atomic_read(&sess->session_fall_back_to_erl0)) { 4344 spin_unlock_bh(&sess->conn_lock); 4345 target_put_session(sess->se_sess); 4346 4347 return 0; 4348 } else if (atomic_read(&sess->session_logout)) { 4349 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4350 sess->session_state = TARG_SESS_STATE_FREE; 4351 spin_unlock_bh(&sess->conn_lock); 4352 4353 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4354 complete(&sess->session_wait_comp); 4355 4356 return 0; 4357 } else { 4358 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4359 sess->session_state = TARG_SESS_STATE_FAILED; 4360 4361 if (!atomic_read(&sess->session_continuation)) { 4362 spin_unlock_bh(&sess->conn_lock); 4363 iscsit_start_time2retain_handler(sess); 4364 } else 4365 spin_unlock_bh(&sess->conn_lock); 4366 4367 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4368 complete(&sess->session_wait_comp); 4369 4370 return 0; 4371 } 4372 spin_unlock_bh(&sess->conn_lock); 4373 4374 return 0; 4375 } 4376 4377 int iscsit_close_session(struct iscsi_session *sess) 4378 { 4379 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); 4380 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4381 4382 if (atomic_read(&sess->nconn)) { 4383 pr_err("%d connection(s) still exist for iSCSI session" 4384 " to %s\n", atomic_read(&sess->nconn), 4385 sess->sess_ops->InitiatorName); 4386 BUG(); 4387 } 4388 4389 spin_lock_bh(&se_tpg->session_lock); 4390 atomic_set(&sess->session_logout, 1); 4391 atomic_set(&sess->session_reinstatement, 1); 4392 iscsit_stop_time2retain_timer(sess); 4393 spin_unlock_bh(&se_tpg->session_lock); 4394 4395 /* 4396 * transport_deregister_session_configfs() will clear the 4397 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4398 * can be setting it again with __transport_register_session() in 4399 * iscsi_post_login_handler() again after the iscsit_stop_session() 4400 * completes in iscsi_np context. 4401 */ 4402 transport_deregister_session_configfs(sess->se_sess); 4403 4404 /* 4405 * If any other processes are accessing this session pointer we must 4406 * wait until they have completed. If we are in an interrupt (the 4407 * time2retain handler) and contain and active session usage count we 4408 * restart the timer and exit. 4409 */ 4410 if (!in_interrupt()) { 4411 if (iscsit_check_session_usage_count(sess) == 1) 4412 iscsit_stop_session(sess, 1, 1); 4413 } else { 4414 if (iscsit_check_session_usage_count(sess) == 2) { 4415 atomic_set(&sess->session_logout, 0); 4416 iscsit_start_time2retain_handler(sess); 4417 return 0; 4418 } 4419 } 4420 4421 transport_deregister_session(sess->se_sess); 4422 4423 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4424 iscsit_free_connection_recovery_entires(sess); 4425 4426 iscsit_free_all_ooo_cmdsns(sess); 4427 4428 spin_lock_bh(&se_tpg->session_lock); 4429 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4430 sess->session_state = TARG_SESS_STATE_FREE; 4431 pr_debug("Released iSCSI session from node: %s\n", 4432 sess->sess_ops->InitiatorName); 4433 tpg->nsessions--; 4434 if (tpg->tpg_tiqn) 4435 tpg->tpg_tiqn->tiqn_nsessions--; 4436 4437 pr_debug("Decremented number of active iSCSI Sessions on" 4438 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4439 4440 spin_lock(&sess_idr_lock); 4441 idr_remove(&sess_idr, sess->session_index); 4442 spin_unlock(&sess_idr_lock); 4443 4444 kfree(sess->sess_ops); 4445 sess->sess_ops = NULL; 4446 spin_unlock_bh(&se_tpg->session_lock); 4447 4448 kfree(sess); 4449 return 0; 4450 } 4451 4452 static void iscsit_logout_post_handler_closesession( 4453 struct iscsi_conn *conn) 4454 { 4455 struct iscsi_session *sess = conn->sess; 4456 4457 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4458 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4459 4460 atomic_set(&conn->conn_logout_remove, 0); 4461 complete(&conn->conn_logout_comp); 4462 4463 iscsit_dec_conn_usage_count(conn); 4464 iscsit_stop_session(sess, 1, 1); 4465 iscsit_dec_session_usage_count(sess); 4466 target_put_session(sess->se_sess); 4467 } 4468 4469 static void iscsit_logout_post_handler_samecid( 4470 struct iscsi_conn *conn) 4471 { 4472 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4473 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4474 4475 atomic_set(&conn->conn_logout_remove, 0); 4476 complete(&conn->conn_logout_comp); 4477 4478 iscsit_cause_connection_reinstatement(conn, 1); 4479 iscsit_dec_conn_usage_count(conn); 4480 } 4481 4482 static void iscsit_logout_post_handler_diffcid( 4483 struct iscsi_conn *conn, 4484 u16 cid) 4485 { 4486 struct iscsi_conn *l_conn; 4487 struct iscsi_session *sess = conn->sess; 4488 4489 if (!sess) 4490 return; 4491 4492 spin_lock_bh(&sess->conn_lock); 4493 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4494 if (l_conn->cid == cid) { 4495 iscsit_inc_conn_usage_count(l_conn); 4496 break; 4497 } 4498 } 4499 spin_unlock_bh(&sess->conn_lock); 4500 4501 if (!l_conn) 4502 return; 4503 4504 if (l_conn->sock) 4505 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4506 4507 spin_lock_bh(&l_conn->state_lock); 4508 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4509 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4510 spin_unlock_bh(&l_conn->state_lock); 4511 4512 iscsit_cause_connection_reinstatement(l_conn, 1); 4513 iscsit_dec_conn_usage_count(l_conn); 4514 } 4515 4516 /* 4517 * Return of 0 causes the TX thread to restart. 4518 */ 4519 int iscsit_logout_post_handler( 4520 struct iscsi_cmd *cmd, 4521 struct iscsi_conn *conn) 4522 { 4523 int ret = 0; 4524 4525 switch (cmd->logout_reason) { 4526 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4527 switch (cmd->logout_response) { 4528 case ISCSI_LOGOUT_SUCCESS: 4529 case ISCSI_LOGOUT_CLEANUP_FAILED: 4530 default: 4531 iscsit_logout_post_handler_closesession(conn); 4532 break; 4533 } 4534 ret = 0; 4535 break; 4536 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4537 if (conn->cid == cmd->logout_cid) { 4538 switch (cmd->logout_response) { 4539 case ISCSI_LOGOUT_SUCCESS: 4540 case ISCSI_LOGOUT_CLEANUP_FAILED: 4541 default: 4542 iscsit_logout_post_handler_samecid(conn); 4543 break; 4544 } 4545 ret = 0; 4546 } else { 4547 switch (cmd->logout_response) { 4548 case ISCSI_LOGOUT_SUCCESS: 4549 iscsit_logout_post_handler_diffcid(conn, 4550 cmd->logout_cid); 4551 break; 4552 case ISCSI_LOGOUT_CID_NOT_FOUND: 4553 case ISCSI_LOGOUT_CLEANUP_FAILED: 4554 default: 4555 break; 4556 } 4557 ret = 1; 4558 } 4559 break; 4560 case ISCSI_LOGOUT_REASON_RECOVERY: 4561 switch (cmd->logout_response) { 4562 case ISCSI_LOGOUT_SUCCESS: 4563 case ISCSI_LOGOUT_CID_NOT_FOUND: 4564 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4565 case ISCSI_LOGOUT_CLEANUP_FAILED: 4566 default: 4567 break; 4568 } 4569 ret = 1; 4570 break; 4571 default: 4572 break; 4573 4574 } 4575 return ret; 4576 } 4577 EXPORT_SYMBOL(iscsit_logout_post_handler); 4578 4579 void iscsit_fail_session(struct iscsi_session *sess) 4580 { 4581 struct iscsi_conn *conn; 4582 4583 spin_lock_bh(&sess->conn_lock); 4584 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4585 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4586 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4587 } 4588 spin_unlock_bh(&sess->conn_lock); 4589 4590 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4591 sess->session_state = TARG_SESS_STATE_FAILED; 4592 } 4593 4594 int iscsit_free_session(struct iscsi_session *sess) 4595 { 4596 u16 conn_count = atomic_read(&sess->nconn); 4597 struct iscsi_conn *conn, *conn_tmp = NULL; 4598 int is_last; 4599 4600 spin_lock_bh(&sess->conn_lock); 4601 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4602 4603 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4604 conn_list) { 4605 if (conn_count == 0) 4606 break; 4607 4608 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4609 is_last = 1; 4610 } else { 4611 iscsit_inc_conn_usage_count(conn_tmp); 4612 is_last = 0; 4613 } 4614 iscsit_inc_conn_usage_count(conn); 4615 4616 spin_unlock_bh(&sess->conn_lock); 4617 iscsit_cause_connection_reinstatement(conn, 1); 4618 spin_lock_bh(&sess->conn_lock); 4619 4620 iscsit_dec_conn_usage_count(conn); 4621 if (is_last == 0) 4622 iscsit_dec_conn_usage_count(conn_tmp); 4623 4624 conn_count--; 4625 } 4626 4627 if (atomic_read(&sess->nconn)) { 4628 spin_unlock_bh(&sess->conn_lock); 4629 wait_for_completion(&sess->session_wait_comp); 4630 } else 4631 spin_unlock_bh(&sess->conn_lock); 4632 4633 target_put_session(sess->se_sess); 4634 return 0; 4635 } 4636 4637 void iscsit_stop_session( 4638 struct iscsi_session *sess, 4639 int session_sleep, 4640 int connection_sleep) 4641 { 4642 u16 conn_count = atomic_read(&sess->nconn); 4643 struct iscsi_conn *conn, *conn_tmp = NULL; 4644 int is_last; 4645 4646 spin_lock_bh(&sess->conn_lock); 4647 if (session_sleep) 4648 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4649 4650 if (connection_sleep) { 4651 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4652 conn_list) { 4653 if (conn_count == 0) 4654 break; 4655 4656 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4657 is_last = 1; 4658 } else { 4659 iscsit_inc_conn_usage_count(conn_tmp); 4660 is_last = 0; 4661 } 4662 iscsit_inc_conn_usage_count(conn); 4663 4664 spin_unlock_bh(&sess->conn_lock); 4665 iscsit_cause_connection_reinstatement(conn, 1); 4666 spin_lock_bh(&sess->conn_lock); 4667 4668 iscsit_dec_conn_usage_count(conn); 4669 if (is_last == 0) 4670 iscsit_dec_conn_usage_count(conn_tmp); 4671 conn_count--; 4672 } 4673 } else { 4674 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4675 iscsit_cause_connection_reinstatement(conn, 0); 4676 } 4677 4678 if (session_sleep && atomic_read(&sess->nconn)) { 4679 spin_unlock_bh(&sess->conn_lock); 4680 wait_for_completion(&sess->session_wait_comp); 4681 } else 4682 spin_unlock_bh(&sess->conn_lock); 4683 } 4684 4685 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4686 { 4687 struct iscsi_session *sess; 4688 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4689 struct se_session *se_sess, *se_sess_tmp; 4690 int session_count = 0; 4691 4692 spin_lock_bh(&se_tpg->session_lock); 4693 if (tpg->nsessions && !force) { 4694 spin_unlock_bh(&se_tpg->session_lock); 4695 return -1; 4696 } 4697 4698 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4699 sess_list) { 4700 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4701 4702 spin_lock(&sess->conn_lock); 4703 if (atomic_read(&sess->session_fall_back_to_erl0) || 4704 atomic_read(&sess->session_logout) || 4705 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4706 spin_unlock(&sess->conn_lock); 4707 continue; 4708 } 4709 atomic_set(&sess->session_reinstatement, 1); 4710 spin_unlock(&sess->conn_lock); 4711 spin_unlock_bh(&se_tpg->session_lock); 4712 4713 iscsit_free_session(sess); 4714 spin_lock_bh(&se_tpg->session_lock); 4715 4716 session_count++; 4717 } 4718 spin_unlock_bh(&se_tpg->session_lock); 4719 4720 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4721 " Group: %hu\n", session_count, tpg->tpgt); 4722 return 0; 4723 } 4724 4725 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4726 MODULE_VERSION("4.1.x"); 4727 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4728 MODULE_LICENSE("GPL"); 4729 4730 module_init(iscsi_target_init_module); 4731 module_exit(iscsi_target_cleanup_module); 4732