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 <target/iscsi/iscsi_target_core.h> 34 #include "iscsi_target_parameters.h" 35 #include "iscsi_target_seq_pdu_list.h" 36 #include "iscsi_target_datain_values.h" 37 #include "iscsi_target_erl0.h" 38 #include "iscsi_target_erl1.h" 39 #include "iscsi_target_erl2.h" 40 #include "iscsi_target_login.h" 41 #include "iscsi_target_tmr.h" 42 #include "iscsi_target_tpg.h" 43 #include "iscsi_target_util.h" 44 #include "iscsi_target.h" 45 #include "iscsi_target_device.h" 46 #include <target/iscsi/iscsi_target_stat.h> 47 48 #include <target/iscsi/iscsi_transport.h> 49 50 static LIST_HEAD(g_tiqn_list); 51 static LIST_HEAD(g_np_list); 52 static DEFINE_SPINLOCK(tiqn_lock); 53 static DEFINE_MUTEX(np_lock); 54 55 static struct idr tiqn_idr; 56 struct idr sess_idr; 57 struct mutex auth_id_lock; 58 spinlock_t sess_idr_lock; 59 60 struct iscsit_global *iscsit_global; 61 62 struct kmem_cache *lio_qr_cache; 63 struct kmem_cache *lio_dr_cache; 64 struct kmem_cache *lio_ooo_cache; 65 struct kmem_cache *lio_r2t_cache; 66 67 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 68 struct iscsi_scsi_req *, u32); 69 70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 71 { 72 struct iscsi_tiqn *tiqn = NULL; 73 74 spin_lock(&tiqn_lock); 75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 76 if (!strcmp(tiqn->tiqn, buf)) { 77 78 spin_lock(&tiqn->tiqn_state_lock); 79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 80 tiqn->tiqn_access_count++; 81 spin_unlock(&tiqn->tiqn_state_lock); 82 spin_unlock(&tiqn_lock); 83 return tiqn; 84 } 85 spin_unlock(&tiqn->tiqn_state_lock); 86 } 87 } 88 spin_unlock(&tiqn_lock); 89 90 return NULL; 91 } 92 93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 94 { 95 spin_lock(&tiqn->tiqn_state_lock); 96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 98 spin_unlock(&tiqn->tiqn_state_lock); 99 return 0; 100 } 101 spin_unlock(&tiqn->tiqn_state_lock); 102 103 return -1; 104 } 105 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 107 { 108 spin_lock(&tiqn->tiqn_state_lock); 109 tiqn->tiqn_access_count--; 110 spin_unlock(&tiqn->tiqn_state_lock); 111 } 112 113 /* 114 * Note that IQN formatting is expected to be done in userspace, and 115 * no explict IQN format checks are done here. 116 */ 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 118 { 119 struct iscsi_tiqn *tiqn = NULL; 120 int ret; 121 122 if (strlen(buf) >= ISCSI_IQN_LEN) { 123 pr_err("Target IQN exceeds %d bytes\n", 124 ISCSI_IQN_LEN); 125 return ERR_PTR(-EINVAL); 126 } 127 128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 129 if (!tiqn) { 130 pr_err("Unable to allocate struct iscsi_tiqn\n"); 131 return ERR_PTR(-ENOMEM); 132 } 133 134 sprintf(tiqn->tiqn, "%s", buf); 135 INIT_LIST_HEAD(&tiqn->tiqn_list); 136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 137 spin_lock_init(&tiqn->tiqn_state_lock); 138 spin_lock_init(&tiqn->tiqn_tpg_lock); 139 spin_lock_init(&tiqn->sess_err_stats.lock); 140 spin_lock_init(&tiqn->login_stats.lock); 141 spin_lock_init(&tiqn->logout_stats.lock); 142 143 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 144 145 idr_preload(GFP_KERNEL); 146 spin_lock(&tiqn_lock); 147 148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 149 if (ret < 0) { 150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 151 spin_unlock(&tiqn_lock); 152 idr_preload_end(); 153 kfree(tiqn); 154 return ERR_PTR(ret); 155 } 156 tiqn->tiqn_index = ret; 157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 158 159 spin_unlock(&tiqn_lock); 160 idr_preload_end(); 161 162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 163 164 return tiqn; 165 166 } 167 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 169 { 170 /* 171 * Wait for accesses to said struct iscsi_tiqn to end. 172 */ 173 spin_lock(&tiqn->tiqn_state_lock); 174 while (tiqn->tiqn_access_count != 0) { 175 spin_unlock(&tiqn->tiqn_state_lock); 176 msleep(10); 177 spin_lock(&tiqn->tiqn_state_lock); 178 } 179 spin_unlock(&tiqn->tiqn_state_lock); 180 } 181 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 183 { 184 /* 185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 186 * while holding tiqn->tiqn_state_lock. This means that all subsequent 187 * attempts to access this struct iscsi_tiqn will fail from both transport 188 * fabric and control code paths. 189 */ 190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 191 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 192 return; 193 } 194 195 iscsit_wait_for_tiqn(tiqn); 196 197 spin_lock(&tiqn_lock); 198 list_del(&tiqn->tiqn_list); 199 idr_remove(&tiqn_idr, tiqn->tiqn_index); 200 spin_unlock(&tiqn_lock); 201 202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 203 tiqn->tiqn); 204 kfree(tiqn); 205 } 206 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 208 { 209 int ret; 210 /* 211 * Determine if the network portal is accepting storage traffic. 212 */ 213 spin_lock_bh(&np->np_thread_lock); 214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 215 spin_unlock_bh(&np->np_thread_lock); 216 return -1; 217 } 218 spin_unlock_bh(&np->np_thread_lock); 219 /* 220 * Determine if the portal group is accepting storage traffic. 221 */ 222 spin_lock_bh(&tpg->tpg_state_lock); 223 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 224 spin_unlock_bh(&tpg->tpg_state_lock); 225 return -1; 226 } 227 spin_unlock_bh(&tpg->tpg_state_lock); 228 229 /* 230 * Here we serialize access across the TIQN+TPG Tuple. 231 */ 232 ret = down_interruptible(&tpg->np_login_sem); 233 if ((ret != 0) || signal_pending(current)) 234 return -1; 235 236 spin_lock_bh(&tpg->tpg_state_lock); 237 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 238 spin_unlock_bh(&tpg->tpg_state_lock); 239 up(&tpg->np_login_sem); 240 return -1; 241 } 242 spin_unlock_bh(&tpg->tpg_state_lock); 243 244 return 0; 245 } 246 247 void iscsit_login_kref_put(struct kref *kref) 248 { 249 struct iscsi_tpg_np *tpg_np = container_of(kref, 250 struct iscsi_tpg_np, tpg_np_kref); 251 252 complete(&tpg_np->tpg_np_comp); 253 } 254 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 256 struct iscsi_tpg_np *tpg_np) 257 { 258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 259 260 up(&tpg->np_login_sem); 261 262 if (tpg_np) 263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 264 265 if (tiqn) 266 iscsit_put_tiqn_for_login(tiqn); 267 268 return 0; 269 } 270 271 bool iscsit_check_np_match( 272 struct __kernel_sockaddr_storage *sockaddr, 273 struct iscsi_np *np, 274 int network_transport) 275 { 276 struct sockaddr_in *sock_in, *sock_in_e; 277 struct sockaddr_in6 *sock_in6, *sock_in6_e; 278 bool ip_match = false; 279 u16 port; 280 281 if (sockaddr->ss_family == AF_INET6) { 282 sock_in6 = (struct sockaddr_in6 *)sockaddr; 283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 284 285 if (!memcmp(&sock_in6->sin6_addr.in6_u, 286 &sock_in6_e->sin6_addr.in6_u, 287 sizeof(struct in6_addr))) 288 ip_match = true; 289 290 port = ntohs(sock_in6->sin6_port); 291 } else { 292 sock_in = (struct sockaddr_in *)sockaddr; 293 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 294 295 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 296 ip_match = true; 297 298 port = ntohs(sock_in->sin_port); 299 } 300 301 if (ip_match && (np->np_port == port) && 302 (np->np_network_transport == network_transport)) 303 return true; 304 305 return false; 306 } 307 308 /* 309 * Called with mutex np_lock held 310 */ 311 static struct iscsi_np *iscsit_get_np( 312 struct __kernel_sockaddr_storage *sockaddr, 313 int network_transport) 314 { 315 struct iscsi_np *np; 316 bool match; 317 318 list_for_each_entry(np, &g_np_list, np_list) { 319 spin_lock_bh(&np->np_thread_lock); 320 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 321 spin_unlock_bh(&np->np_thread_lock); 322 continue; 323 } 324 325 match = iscsit_check_np_match(sockaddr, np, network_transport); 326 if (match) { 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_bh(&np->np_thread_lock); 334 return np; 335 } 336 spin_unlock_bh(&np->np_thread_lock); 337 } 338 339 return NULL; 340 } 341 342 struct iscsi_np *iscsit_add_np( 343 struct __kernel_sockaddr_storage *sockaddr, 344 char *ip_str, 345 int network_transport) 346 { 347 struct sockaddr_in *sock_in; 348 struct sockaddr_in6 *sock_in6; 349 struct iscsi_np *np; 350 int ret; 351 352 mutex_lock(&np_lock); 353 354 /* 355 * Locate the existing struct iscsi_np if already active.. 356 */ 357 np = iscsit_get_np(sockaddr, network_transport); 358 if (np) { 359 mutex_unlock(&np_lock); 360 return np; 361 } 362 363 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 364 if (!np) { 365 pr_err("Unable to allocate memory for struct iscsi_np\n"); 366 mutex_unlock(&np_lock); 367 return ERR_PTR(-ENOMEM); 368 } 369 370 np->np_flags |= NPF_IP_NETWORK; 371 if (sockaddr->ss_family == AF_INET6) { 372 sock_in6 = (struct sockaddr_in6 *)sockaddr; 373 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 374 np->np_port = ntohs(sock_in6->sin6_port); 375 } else { 376 sock_in = (struct sockaddr_in *)sockaddr; 377 sprintf(np->np_ip, "%s", ip_str); 378 np->np_port = ntohs(sock_in->sin_port); 379 } 380 381 np->np_network_transport = network_transport; 382 spin_lock_init(&np->np_thread_lock); 383 init_completion(&np->np_restart_comp); 384 INIT_LIST_HEAD(&np->np_list); 385 386 ret = iscsi_target_setup_login_socket(np, sockaddr); 387 if (ret != 0) { 388 kfree(np); 389 mutex_unlock(&np_lock); 390 return ERR_PTR(ret); 391 } 392 393 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 394 if (IS_ERR(np->np_thread)) { 395 pr_err("Unable to create kthread: iscsi_np\n"); 396 ret = PTR_ERR(np->np_thread); 397 kfree(np); 398 mutex_unlock(&np_lock); 399 return ERR_PTR(ret); 400 } 401 /* 402 * Increment the np_exports reference count now to prevent 403 * iscsit_del_np() below from being run while a new call to 404 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 405 * active. We don't need to hold np->np_thread_lock at this 406 * point because iscsi_np has not been added to g_np_list yet. 407 */ 408 np->np_exports = 1; 409 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 410 411 list_add_tail(&np->np_list, &g_np_list); 412 mutex_unlock(&np_lock); 413 414 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 415 np->np_ip, np->np_port, np->np_transport->name); 416 417 return np; 418 } 419 420 int iscsit_reset_np_thread( 421 struct iscsi_np *np, 422 struct iscsi_tpg_np *tpg_np, 423 struct iscsi_portal_group *tpg, 424 bool shutdown) 425 { 426 spin_lock_bh(&np->np_thread_lock); 427 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 428 spin_unlock_bh(&np->np_thread_lock); 429 return 0; 430 } 431 np->np_thread_state = ISCSI_NP_THREAD_RESET; 432 433 if (np->np_thread) { 434 spin_unlock_bh(&np->np_thread_lock); 435 send_sig(SIGINT, np->np_thread, 1); 436 wait_for_completion(&np->np_restart_comp); 437 spin_lock_bh(&np->np_thread_lock); 438 } 439 spin_unlock_bh(&np->np_thread_lock); 440 441 if (tpg_np && shutdown) { 442 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 443 444 wait_for_completion(&tpg_np->tpg_np_comp); 445 } 446 447 return 0; 448 } 449 450 static void iscsit_free_np(struct iscsi_np *np) 451 { 452 if (np->np_socket) 453 sock_release(np->np_socket); 454 } 455 456 int iscsit_del_np(struct iscsi_np *np) 457 { 458 spin_lock_bh(&np->np_thread_lock); 459 np->np_exports--; 460 if (np->np_exports) { 461 np->enabled = true; 462 spin_unlock_bh(&np->np_thread_lock); 463 return 0; 464 } 465 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 466 spin_unlock_bh(&np->np_thread_lock); 467 468 if (np->np_thread) { 469 /* 470 * We need to send the signal to wakeup Linux/Net 471 * which may be sleeping in sock_accept().. 472 */ 473 send_sig(SIGINT, np->np_thread, 1); 474 kthread_stop(np->np_thread); 475 np->np_thread = NULL; 476 } 477 478 np->np_transport->iscsit_free_np(np); 479 480 mutex_lock(&np_lock); 481 list_del(&np->np_list); 482 mutex_unlock(&np_lock); 483 484 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 485 np->np_ip, np->np_port, np->np_transport->name); 486 487 iscsit_put_transport(np->np_transport); 488 kfree(np); 489 return 0; 490 } 491 492 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 493 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 494 495 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 496 { 497 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 498 return 0; 499 } 500 501 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 502 { 503 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD); 504 505 spin_lock_bh(&conn->cmd_lock); 506 if (!list_empty(&cmd->i_conn_node)) 507 list_del_init(&cmd->i_conn_node); 508 spin_unlock_bh(&conn->cmd_lock); 509 510 __iscsit_free_cmd(cmd, scsi_cmd, true); 511 } 512 513 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 514 { 515 return TARGET_PROT_NORMAL; 516 } 517 518 static struct iscsit_transport iscsi_target_transport = { 519 .name = "iSCSI/TCP", 520 .transport_type = ISCSI_TCP, 521 .owner = NULL, 522 .iscsit_setup_np = iscsit_setup_np, 523 .iscsit_accept_np = iscsit_accept_np, 524 .iscsit_free_np = iscsit_free_np, 525 .iscsit_get_login_rx = iscsit_get_login_rx, 526 .iscsit_put_login_tx = iscsit_put_login_tx, 527 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 528 .iscsit_immediate_queue = iscsit_immediate_queue, 529 .iscsit_response_queue = iscsit_response_queue, 530 .iscsit_queue_data_in = iscsit_queue_rsp, 531 .iscsit_queue_status = iscsit_queue_rsp, 532 .iscsit_aborted_task = iscsit_aborted_task, 533 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 534 }; 535 536 static int __init iscsi_target_init_module(void) 537 { 538 int ret = 0, size; 539 540 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 541 542 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 543 if (!iscsit_global) { 544 pr_err("Unable to allocate memory for iscsit_global\n"); 545 return -1; 546 } 547 spin_lock_init(&iscsit_global->ts_bitmap_lock); 548 mutex_init(&auth_id_lock); 549 spin_lock_init(&sess_idr_lock); 550 idr_init(&tiqn_idr); 551 idr_init(&sess_idr); 552 553 ret = target_register_template(&iscsi_ops); 554 if (ret) 555 goto out; 556 557 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 558 iscsit_global->ts_bitmap = vzalloc(size); 559 if (!iscsit_global->ts_bitmap) { 560 pr_err("Unable to allocate iscsit_global->ts_bitmap\n"); 561 goto configfs_out; 562 } 563 564 lio_qr_cache = kmem_cache_create("lio_qr_cache", 565 sizeof(struct iscsi_queue_req), 566 __alignof__(struct iscsi_queue_req), 0, NULL); 567 if (!lio_qr_cache) { 568 pr_err("nable to kmem_cache_create() for" 569 " lio_qr_cache\n"); 570 goto bitmap_out; 571 } 572 573 lio_dr_cache = kmem_cache_create("lio_dr_cache", 574 sizeof(struct iscsi_datain_req), 575 __alignof__(struct iscsi_datain_req), 0, NULL); 576 if (!lio_dr_cache) { 577 pr_err("Unable to kmem_cache_create() for" 578 " lio_dr_cache\n"); 579 goto qr_out; 580 } 581 582 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 583 sizeof(struct iscsi_ooo_cmdsn), 584 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 585 if (!lio_ooo_cache) { 586 pr_err("Unable to kmem_cache_create() for" 587 " lio_ooo_cache\n"); 588 goto dr_out; 589 } 590 591 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 592 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 593 0, NULL); 594 if (!lio_r2t_cache) { 595 pr_err("Unable to kmem_cache_create() for" 596 " lio_r2t_cache\n"); 597 goto ooo_out; 598 } 599 600 iscsit_register_transport(&iscsi_target_transport); 601 602 if (iscsit_load_discovery_tpg() < 0) 603 goto r2t_out; 604 605 return ret; 606 r2t_out: 607 iscsit_unregister_transport(&iscsi_target_transport); 608 kmem_cache_destroy(lio_r2t_cache); 609 ooo_out: 610 kmem_cache_destroy(lio_ooo_cache); 611 dr_out: 612 kmem_cache_destroy(lio_dr_cache); 613 qr_out: 614 kmem_cache_destroy(lio_qr_cache); 615 bitmap_out: 616 vfree(iscsit_global->ts_bitmap); 617 configfs_out: 618 /* XXX: this probably wants it to be it's own unwind step.. */ 619 if (iscsit_global->discovery_tpg) 620 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 621 target_unregister_template(&iscsi_ops); 622 out: 623 kfree(iscsit_global); 624 return -ENOMEM; 625 } 626 627 static void __exit iscsi_target_cleanup_module(void) 628 { 629 iscsit_release_discovery_tpg(); 630 iscsit_unregister_transport(&iscsi_target_transport); 631 kmem_cache_destroy(lio_qr_cache); 632 kmem_cache_destroy(lio_dr_cache); 633 kmem_cache_destroy(lio_ooo_cache); 634 kmem_cache_destroy(lio_r2t_cache); 635 636 /* 637 * Shutdown discovery sessions and disable discovery TPG 638 */ 639 if (iscsit_global->discovery_tpg) 640 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 641 642 target_unregister_template(&iscsi_ops); 643 644 vfree(iscsit_global->ts_bitmap); 645 kfree(iscsit_global); 646 } 647 648 static int iscsit_add_reject( 649 struct iscsi_conn *conn, 650 u8 reason, 651 unsigned char *buf) 652 { 653 struct iscsi_cmd *cmd; 654 655 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 656 if (!cmd) 657 return -1; 658 659 cmd->iscsi_opcode = ISCSI_OP_REJECT; 660 cmd->reject_reason = reason; 661 662 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 663 if (!cmd->buf_ptr) { 664 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 665 iscsit_free_cmd(cmd, false); 666 return -1; 667 } 668 669 spin_lock_bh(&conn->cmd_lock); 670 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 671 spin_unlock_bh(&conn->cmd_lock); 672 673 cmd->i_state = ISTATE_SEND_REJECT; 674 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 675 676 return -1; 677 } 678 679 static int iscsit_add_reject_from_cmd( 680 struct iscsi_cmd *cmd, 681 u8 reason, 682 bool add_to_conn, 683 unsigned char *buf) 684 { 685 struct iscsi_conn *conn; 686 687 if (!cmd->conn) { 688 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 689 cmd->init_task_tag); 690 return -1; 691 } 692 conn = cmd->conn; 693 694 cmd->iscsi_opcode = ISCSI_OP_REJECT; 695 cmd->reject_reason = reason; 696 697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 698 if (!cmd->buf_ptr) { 699 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 700 iscsit_free_cmd(cmd, false); 701 return -1; 702 } 703 704 if (add_to_conn) { 705 spin_lock_bh(&conn->cmd_lock); 706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 707 spin_unlock_bh(&conn->cmd_lock); 708 } 709 710 cmd->i_state = ISTATE_SEND_REJECT; 711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 712 /* 713 * Perform the kref_put now if se_cmd has already been setup by 714 * scsit_setup_scsi_cmd() 715 */ 716 if (cmd->se_cmd.se_tfo != NULL) { 717 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 718 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 719 } 720 return -1; 721 } 722 723 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 724 unsigned char *buf) 725 { 726 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 727 } 728 729 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 730 { 731 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 732 } 733 734 /* 735 * Map some portion of the allocated scatterlist to an iovec, suitable for 736 * kernel sockets to copy data in/out. 737 */ 738 static int iscsit_map_iovec( 739 struct iscsi_cmd *cmd, 740 struct kvec *iov, 741 u32 data_offset, 742 u32 data_length) 743 { 744 u32 i = 0; 745 struct scatterlist *sg; 746 unsigned int page_off; 747 748 /* 749 * We know each entry in t_data_sg contains a page. 750 */ 751 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 752 page_off = (data_offset % PAGE_SIZE); 753 754 cmd->first_data_sg = sg; 755 cmd->first_data_sg_off = page_off; 756 757 while (data_length) { 758 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 759 760 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 761 iov[i].iov_len = cur_len; 762 763 data_length -= cur_len; 764 page_off = 0; 765 sg = sg_next(sg); 766 i++; 767 } 768 769 cmd->kmapped_nents = i; 770 771 return i; 772 } 773 774 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 775 { 776 u32 i; 777 struct scatterlist *sg; 778 779 sg = cmd->first_data_sg; 780 781 for (i = 0; i < cmd->kmapped_nents; i++) 782 kunmap(sg_page(&sg[i])); 783 } 784 785 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 786 { 787 LIST_HEAD(ack_list); 788 struct iscsi_cmd *cmd, *cmd_p; 789 790 conn->exp_statsn = exp_statsn; 791 792 if (conn->sess->sess_ops->RDMAExtensions) 793 return; 794 795 spin_lock_bh(&conn->cmd_lock); 796 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 797 spin_lock(&cmd->istate_lock); 798 if ((cmd->i_state == ISTATE_SENT_STATUS) && 799 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 800 cmd->i_state = ISTATE_REMOVE; 801 spin_unlock(&cmd->istate_lock); 802 list_move_tail(&cmd->i_conn_node, &ack_list); 803 continue; 804 } 805 spin_unlock(&cmd->istate_lock); 806 } 807 spin_unlock_bh(&conn->cmd_lock); 808 809 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 810 list_del_init(&cmd->i_conn_node); 811 iscsit_free_cmd(cmd, false); 812 } 813 } 814 815 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 816 { 817 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 818 819 iov_count += ISCSI_IOV_DATA_BUFFER; 820 821 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 822 if (!cmd->iov_data) { 823 pr_err("Unable to allocate cmd->iov_data\n"); 824 return -ENOMEM; 825 } 826 827 cmd->orig_iov_data_count = iov_count; 828 return 0; 829 } 830 831 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 832 unsigned char *buf) 833 { 834 int data_direction, payload_length; 835 struct iscsi_scsi_req *hdr; 836 int iscsi_task_attr; 837 int sam_task_attr; 838 839 atomic_long_inc(&conn->sess->cmd_pdus); 840 841 hdr = (struct iscsi_scsi_req *) buf; 842 payload_length = ntoh24(hdr->dlength); 843 844 /* FIXME; Add checks for AdditionalHeaderSegment */ 845 846 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 847 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 848 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 849 " not set. Bad iSCSI Initiator.\n"); 850 return iscsit_add_reject_cmd(cmd, 851 ISCSI_REASON_BOOKMARK_INVALID, buf); 852 } 853 854 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 855 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 856 /* 857 * From RFC-3720 Section 10.3.1: 858 * 859 * "Either or both of R and W MAY be 1 when either the 860 * Expected Data Transfer Length and/or Bidirectional Read 861 * Expected Data Transfer Length are 0" 862 * 863 * For this case, go ahead and clear the unnecssary bits 864 * to avoid any confusion with ->data_direction. 865 */ 866 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 867 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 868 869 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 870 " set when Expected Data Transfer Length is 0 for" 871 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 872 } 873 874 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 875 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 876 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 877 " MUST be set if Expected Data Transfer Length is not 0." 878 " Bad iSCSI Initiator\n"); 879 return iscsit_add_reject_cmd(cmd, 880 ISCSI_REASON_BOOKMARK_INVALID, buf); 881 } 882 883 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 884 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 885 pr_err("Bidirectional operations not supported!\n"); 886 return iscsit_add_reject_cmd(cmd, 887 ISCSI_REASON_BOOKMARK_INVALID, buf); 888 } 889 890 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 891 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 892 " Scsi Command PDU.\n"); 893 return iscsit_add_reject_cmd(cmd, 894 ISCSI_REASON_BOOKMARK_INVALID, buf); 895 } 896 897 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 898 pr_err("ImmediateData=No but DataSegmentLength=%u," 899 " protocol error.\n", payload_length); 900 return iscsit_add_reject_cmd(cmd, 901 ISCSI_REASON_PROTOCOL_ERROR, buf); 902 } 903 904 if ((be32_to_cpu(hdr->data_length) == payload_length) && 905 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 906 pr_err("Expected Data Transfer Length and Length of" 907 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 908 " bit is not set protocol error\n"); 909 return iscsit_add_reject_cmd(cmd, 910 ISCSI_REASON_PROTOCOL_ERROR, buf); 911 } 912 913 if (payload_length > be32_to_cpu(hdr->data_length)) { 914 pr_err("DataSegmentLength: %u is greater than" 915 " EDTL: %u, protocol error.\n", payload_length, 916 hdr->data_length); 917 return iscsit_add_reject_cmd(cmd, 918 ISCSI_REASON_PROTOCOL_ERROR, buf); 919 } 920 921 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 922 pr_err("DataSegmentLength: %u is greater than" 923 " MaxXmitDataSegmentLength: %u, protocol error.\n", 924 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 925 return iscsit_add_reject_cmd(cmd, 926 ISCSI_REASON_PROTOCOL_ERROR, buf); 927 } 928 929 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 930 pr_err("DataSegmentLength: %u is greater than" 931 " FirstBurstLength: %u, protocol error.\n", 932 payload_length, conn->sess->sess_ops->FirstBurstLength); 933 return iscsit_add_reject_cmd(cmd, 934 ISCSI_REASON_BOOKMARK_INVALID, buf); 935 } 936 937 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 938 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 939 DMA_NONE; 940 941 cmd->data_direction = data_direction; 942 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 943 /* 944 * Figure out the SAM Task Attribute for the incoming SCSI CDB 945 */ 946 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 947 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 948 sam_task_attr = TCM_SIMPLE_TAG; 949 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 950 sam_task_attr = TCM_ORDERED_TAG; 951 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 952 sam_task_attr = TCM_HEAD_TAG; 953 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 954 sam_task_attr = TCM_ACA_TAG; 955 else { 956 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 957 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 958 sam_task_attr = TCM_SIMPLE_TAG; 959 } 960 961 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 962 cmd->i_state = ISTATE_NEW_CMD; 963 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 964 cmd->immediate_data = (payload_length) ? 1 : 0; 965 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 966 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 967 if (cmd->unsolicited_data) 968 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 969 970 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 971 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 972 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 973 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 974 cmd->targ_xfer_tag = 0xFFFFFFFF; 975 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 976 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 977 cmd->first_burst_len = payload_length; 978 979 if (!conn->sess->sess_ops->RDMAExtensions && 980 cmd->data_direction == DMA_FROM_DEVICE) { 981 struct iscsi_datain_req *dr; 982 983 dr = iscsit_allocate_datain_req(); 984 if (!dr) 985 return iscsit_add_reject_cmd(cmd, 986 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 987 988 iscsit_attach_datain_req(cmd, dr); 989 } 990 991 /* 992 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 993 */ 994 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 995 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 996 cmd->data_direction, sam_task_attr, 997 cmd->sense_buffer + 2); 998 999 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1000 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1001 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1002 conn->cid); 1003 1004 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1005 1006 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1007 scsilun_to_int(&hdr->lun)); 1008 if (cmd->sense_reason) 1009 goto attach_cmd; 1010 1011 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1012 if (cmd->sense_reason) { 1013 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1014 return iscsit_add_reject_cmd(cmd, 1015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1016 } 1017 1018 goto attach_cmd; 1019 } 1020 1021 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1022 return iscsit_add_reject_cmd(cmd, 1023 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1024 } 1025 1026 attach_cmd: 1027 spin_lock_bh(&conn->cmd_lock); 1028 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1029 spin_unlock_bh(&conn->cmd_lock); 1030 /* 1031 * Check if we need to delay processing because of ALUA 1032 * Active/NonOptimized primary access state.. 1033 */ 1034 core_alua_check_nonop_delay(&cmd->se_cmd); 1035 1036 return 0; 1037 } 1038 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1039 1040 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1041 { 1042 iscsit_set_dataout_sequence_values(cmd); 1043 1044 spin_lock_bh(&cmd->dataout_timeout_lock); 1045 iscsit_start_dataout_timer(cmd, cmd->conn); 1046 spin_unlock_bh(&cmd->dataout_timeout_lock); 1047 } 1048 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1049 1050 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1051 struct iscsi_scsi_req *hdr) 1052 { 1053 int cmdsn_ret = 0; 1054 /* 1055 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1056 * the Immediate Bit is not set, and no Immediate 1057 * Data is attached. 1058 * 1059 * A PDU/CmdSN carrying Immediate Data can only 1060 * be processed after the DataCRC has passed. 1061 * If the DataCRC fails, the CmdSN MUST NOT 1062 * be acknowledged. (See below) 1063 */ 1064 if (!cmd->immediate_data) { 1065 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1066 (unsigned char *)hdr, hdr->cmdsn); 1067 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1068 return -1; 1069 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1070 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1071 return 0; 1072 } 1073 } 1074 1075 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1076 1077 /* 1078 * If no Immediate Data is attached, it's OK to return now. 1079 */ 1080 if (!cmd->immediate_data) { 1081 if (!cmd->sense_reason && cmd->unsolicited_data) 1082 iscsit_set_unsoliticed_dataout(cmd); 1083 if (!cmd->sense_reason) 1084 return 0; 1085 1086 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1087 return 0; 1088 } 1089 1090 /* 1091 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1092 * execution. These exceptions are processed in CmdSN order using 1093 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1094 */ 1095 if (cmd->sense_reason) { 1096 if (cmd->reject_reason) 1097 return 0; 1098 1099 return 1; 1100 } 1101 /* 1102 * Call directly into transport_generic_new_cmd() to perform 1103 * the backend memory allocation. 1104 */ 1105 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1106 if (cmd->sense_reason) 1107 return 1; 1108 1109 return 0; 1110 } 1111 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1112 1113 static int 1114 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1115 bool dump_payload) 1116 { 1117 struct iscsi_conn *conn = cmd->conn; 1118 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1119 /* 1120 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1121 */ 1122 if (dump_payload) 1123 goto after_immediate_data; 1124 1125 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1126 cmd->first_burst_len); 1127 after_immediate_data: 1128 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1129 /* 1130 * A PDU/CmdSN carrying Immediate Data passed 1131 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1132 * Immediate Bit is not set. 1133 */ 1134 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1135 (unsigned char *)hdr, hdr->cmdsn); 1136 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1137 return -1; 1138 1139 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1140 int rc; 1141 1142 rc = iscsit_dump_data_payload(cmd->conn, 1143 cmd->first_burst_len, 1); 1144 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1145 return rc; 1146 } else if (cmd->unsolicited_data) 1147 iscsit_set_unsoliticed_dataout(cmd); 1148 1149 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1150 /* 1151 * Immediate Data failed DataCRC and ERL>=1, 1152 * silently drop this PDU and let the initiator 1153 * plug the CmdSN gap. 1154 * 1155 * FIXME: Send Unsolicited NOPIN with reserved 1156 * TTT here to help the initiator figure out 1157 * the missing CmdSN, although they should be 1158 * intelligent enough to determine the missing 1159 * CmdSN and issue a retry to plug the sequence. 1160 */ 1161 cmd->i_state = ISTATE_REMOVE; 1162 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1163 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1164 return -1; 1165 1166 return 0; 1167 } 1168 1169 static int 1170 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1171 unsigned char *buf) 1172 { 1173 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1174 int rc, immed_data; 1175 bool dump_payload = false; 1176 1177 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1178 if (rc < 0) 1179 return 0; 1180 /* 1181 * Allocation iovecs needed for struct socket operations for 1182 * traditional iSCSI block I/O. 1183 */ 1184 if (iscsit_allocate_iovecs(cmd) < 0) { 1185 return iscsit_reject_cmd(cmd, 1186 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1187 } 1188 immed_data = cmd->immediate_data; 1189 1190 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1191 if (rc < 0) 1192 return rc; 1193 else if (rc > 0) 1194 dump_payload = true; 1195 1196 if (!immed_data) 1197 return 0; 1198 1199 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1200 } 1201 1202 static u32 iscsit_do_crypto_hash_sg( 1203 struct hash_desc *hash, 1204 struct iscsi_cmd *cmd, 1205 u32 data_offset, 1206 u32 data_length, 1207 u32 padding, 1208 u8 *pad_bytes) 1209 { 1210 u32 data_crc; 1211 u32 i; 1212 struct scatterlist *sg; 1213 unsigned int page_off; 1214 1215 crypto_hash_init(hash); 1216 1217 sg = cmd->first_data_sg; 1218 page_off = cmd->first_data_sg_off; 1219 1220 i = 0; 1221 while (data_length) { 1222 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1223 1224 crypto_hash_update(hash, &sg[i], cur_len); 1225 1226 data_length -= cur_len; 1227 page_off = 0; 1228 i++; 1229 } 1230 1231 if (padding) { 1232 struct scatterlist pad_sg; 1233 1234 sg_init_one(&pad_sg, pad_bytes, padding); 1235 crypto_hash_update(hash, &pad_sg, padding); 1236 } 1237 crypto_hash_final(hash, (u8 *) &data_crc); 1238 1239 return data_crc; 1240 } 1241 1242 static void iscsit_do_crypto_hash_buf( 1243 struct hash_desc *hash, 1244 const void *buf, 1245 u32 payload_length, 1246 u32 padding, 1247 u8 *pad_bytes, 1248 u8 *data_crc) 1249 { 1250 struct scatterlist sg; 1251 1252 crypto_hash_init(hash); 1253 1254 sg_init_one(&sg, buf, payload_length); 1255 crypto_hash_update(hash, &sg, payload_length); 1256 1257 if (padding) { 1258 sg_init_one(&sg, pad_bytes, padding); 1259 crypto_hash_update(hash, &sg, padding); 1260 } 1261 crypto_hash_final(hash, data_crc); 1262 } 1263 1264 int 1265 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1266 struct iscsi_cmd **out_cmd) 1267 { 1268 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1269 struct iscsi_cmd *cmd = NULL; 1270 struct se_cmd *se_cmd; 1271 u32 payload_length = ntoh24(hdr->dlength); 1272 int rc; 1273 1274 if (!payload_length) { 1275 pr_warn("DataOUT payload is ZERO, ignoring.\n"); 1276 return 0; 1277 } 1278 1279 /* iSCSI write */ 1280 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1281 1282 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1283 pr_err("DataSegmentLength: %u is greater than" 1284 " MaxXmitDataSegmentLength: %u\n", payload_length, 1285 conn->conn_ops->MaxXmitDataSegmentLength); 1286 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1287 buf); 1288 } 1289 1290 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1291 payload_length); 1292 if (!cmd) 1293 return 0; 1294 1295 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1296 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1297 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1298 payload_length, conn->cid); 1299 1300 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1301 pr_err("Command ITT: 0x%08x received DataOUT after" 1302 " last DataOUT received, dumping payload\n", 1303 cmd->init_task_tag); 1304 return iscsit_dump_data_payload(conn, payload_length, 1); 1305 } 1306 1307 if (cmd->data_direction != DMA_TO_DEVICE) { 1308 pr_err("Command ITT: 0x%08x received DataOUT for a" 1309 " NON-WRITE command.\n", cmd->init_task_tag); 1310 return iscsit_dump_data_payload(conn, payload_length, 1); 1311 } 1312 se_cmd = &cmd->se_cmd; 1313 iscsit_mod_dataout_timer(cmd); 1314 1315 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1316 pr_err("DataOut Offset: %u, Length %u greater than" 1317 " iSCSI Command EDTL %u, protocol error.\n", 1318 hdr->offset, payload_length, cmd->se_cmd.data_length); 1319 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1320 } 1321 1322 if (cmd->unsolicited_data) { 1323 int dump_unsolicited_data = 0; 1324 1325 if (conn->sess->sess_ops->InitialR2T) { 1326 pr_err("Received unexpected unsolicited data" 1327 " while InitialR2T=Yes, protocol error.\n"); 1328 transport_send_check_condition_and_sense(&cmd->se_cmd, 1329 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1330 return -1; 1331 } 1332 /* 1333 * Special case for dealing with Unsolicited DataOUT 1334 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1335 * failures; 1336 */ 1337 1338 /* Something's amiss if we're not in WRITE_PENDING state... */ 1339 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1340 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1341 dump_unsolicited_data = 1; 1342 1343 if (dump_unsolicited_data) { 1344 /* 1345 * Check if a delayed TASK_ABORTED status needs to 1346 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1347 * received with the unsolicitied data out. 1348 */ 1349 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1350 iscsit_stop_dataout_timer(cmd); 1351 1352 transport_check_aborted_status(se_cmd, 1353 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1354 return iscsit_dump_data_payload(conn, payload_length, 1); 1355 } 1356 } else { 1357 /* 1358 * For the normal solicited data path: 1359 * 1360 * Check for a delayed TASK_ABORTED status and dump any 1361 * incoming data out payload if one exists. Also, when the 1362 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1363 * data out sequence, we decrement outstanding_r2ts. Once 1364 * outstanding_r2ts reaches zero, go ahead and send the delayed 1365 * TASK_ABORTED status. 1366 */ 1367 if (se_cmd->transport_state & CMD_T_ABORTED) { 1368 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1369 if (--cmd->outstanding_r2ts < 1) { 1370 iscsit_stop_dataout_timer(cmd); 1371 transport_check_aborted_status( 1372 se_cmd, 1); 1373 } 1374 1375 return iscsit_dump_data_payload(conn, payload_length, 1); 1376 } 1377 } 1378 /* 1379 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1380 * within-command recovery checks before receiving the payload. 1381 */ 1382 rc = iscsit_check_pre_dataout(cmd, buf); 1383 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1384 return 0; 1385 else if (rc == DATAOUT_CANNOT_RECOVER) 1386 return -1; 1387 1388 *out_cmd = cmd; 1389 return 0; 1390 } 1391 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1392 1393 static int 1394 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1395 struct iscsi_data *hdr) 1396 { 1397 struct kvec *iov; 1398 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1399 u32 payload_length = ntoh24(hdr->dlength); 1400 int iov_ret, data_crc_failed = 0; 1401 1402 rx_size += payload_length; 1403 iov = &cmd->iov_data[0]; 1404 1405 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1406 payload_length); 1407 if (iov_ret < 0) 1408 return -1; 1409 1410 iov_count += iov_ret; 1411 1412 padding = ((-payload_length) & 3); 1413 if (padding != 0) { 1414 iov[iov_count].iov_base = cmd->pad_bytes; 1415 iov[iov_count++].iov_len = padding; 1416 rx_size += padding; 1417 pr_debug("Receiving %u padding bytes.\n", padding); 1418 } 1419 1420 if (conn->conn_ops->DataDigest) { 1421 iov[iov_count].iov_base = &checksum; 1422 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1423 rx_size += ISCSI_CRC_LEN; 1424 } 1425 1426 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1427 1428 iscsit_unmap_iovec(cmd); 1429 1430 if (rx_got != rx_size) 1431 return -1; 1432 1433 if (conn->conn_ops->DataDigest) { 1434 u32 data_crc; 1435 1436 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1437 be32_to_cpu(hdr->offset), 1438 payload_length, padding, 1439 cmd->pad_bytes); 1440 1441 if (checksum != data_crc) { 1442 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1443 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1444 " does not match computed 0x%08x\n", 1445 hdr->itt, hdr->offset, payload_length, 1446 hdr->datasn, checksum, data_crc); 1447 data_crc_failed = 1; 1448 } else { 1449 pr_debug("Got CRC32C DataDigest 0x%08x for" 1450 " %u bytes of Data Out\n", checksum, 1451 payload_length); 1452 } 1453 } 1454 1455 return data_crc_failed; 1456 } 1457 1458 int 1459 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1460 bool data_crc_failed) 1461 { 1462 struct iscsi_conn *conn = cmd->conn; 1463 int rc, ooo_cmdsn; 1464 /* 1465 * Increment post receive data and CRC values or perform 1466 * within-command recovery. 1467 */ 1468 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1469 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1470 return 0; 1471 else if (rc == DATAOUT_SEND_R2T) { 1472 iscsit_set_dataout_sequence_values(cmd); 1473 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1474 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1475 /* 1476 * Handle extra special case for out of order 1477 * Unsolicited Data Out. 1478 */ 1479 spin_lock_bh(&cmd->istate_lock); 1480 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1481 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1482 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1483 spin_unlock_bh(&cmd->istate_lock); 1484 1485 iscsit_stop_dataout_timer(cmd); 1486 if (ooo_cmdsn) 1487 return 0; 1488 target_execute_cmd(&cmd->se_cmd); 1489 return 0; 1490 } else /* DATAOUT_CANNOT_RECOVER */ 1491 return -1; 1492 1493 return 0; 1494 } 1495 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1496 1497 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1498 { 1499 struct iscsi_cmd *cmd = NULL; 1500 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1501 int rc; 1502 bool data_crc_failed = false; 1503 1504 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1505 if (rc < 0) 1506 return 0; 1507 else if (!cmd) 1508 return 0; 1509 1510 rc = iscsit_get_dataout(conn, cmd, hdr); 1511 if (rc < 0) 1512 return rc; 1513 else if (rc > 0) 1514 data_crc_failed = true; 1515 1516 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1517 } 1518 1519 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1520 struct iscsi_nopout *hdr) 1521 { 1522 u32 payload_length = ntoh24(hdr->dlength); 1523 1524 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1525 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1526 if (!cmd) 1527 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1528 (unsigned char *)hdr); 1529 1530 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1531 (unsigned char *)hdr); 1532 } 1533 1534 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1535 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1536 " not set, protocol error.\n"); 1537 if (!cmd) 1538 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1539 (unsigned char *)hdr); 1540 1541 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1542 (unsigned char *)hdr); 1543 } 1544 1545 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1546 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1547 " greater than MaxXmitDataSegmentLength: %u, protocol" 1548 " error.\n", payload_length, 1549 conn->conn_ops->MaxXmitDataSegmentLength); 1550 if (!cmd) 1551 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1552 (unsigned char *)hdr); 1553 1554 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1555 (unsigned char *)hdr); 1556 } 1557 1558 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1559 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1560 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1561 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1562 payload_length); 1563 /* 1564 * This is not a response to a Unsolicited NopIN, which means 1565 * it can either be a NOPOUT ping request (with a valid ITT), 1566 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1567 * Either way, make sure we allocate an struct iscsi_cmd, as both 1568 * can contain ping data. 1569 */ 1570 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1571 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1572 cmd->i_state = ISTATE_SEND_NOPIN; 1573 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1574 1 : 0); 1575 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1576 cmd->targ_xfer_tag = 0xFFFFFFFF; 1577 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1578 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1579 cmd->data_direction = DMA_NONE; 1580 } 1581 1582 return 0; 1583 } 1584 EXPORT_SYMBOL(iscsit_setup_nop_out); 1585 1586 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1587 struct iscsi_nopout *hdr) 1588 { 1589 struct iscsi_cmd *cmd_p = NULL; 1590 int cmdsn_ret = 0; 1591 /* 1592 * Initiator is expecting a NopIN ping reply.. 1593 */ 1594 if (hdr->itt != RESERVED_ITT) { 1595 if (!cmd) 1596 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1597 (unsigned char *)hdr); 1598 1599 spin_lock_bh(&conn->cmd_lock); 1600 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1601 spin_unlock_bh(&conn->cmd_lock); 1602 1603 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1604 1605 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1606 iscsit_add_cmd_to_response_queue(cmd, conn, 1607 cmd->i_state); 1608 return 0; 1609 } 1610 1611 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1612 (unsigned char *)hdr, hdr->cmdsn); 1613 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1614 return 0; 1615 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1616 return -1; 1617 1618 return 0; 1619 } 1620 /* 1621 * This was a response to a unsolicited NOPIN ping. 1622 */ 1623 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1624 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1625 if (!cmd_p) 1626 return -EINVAL; 1627 1628 iscsit_stop_nopin_response_timer(conn); 1629 1630 cmd_p->i_state = ISTATE_REMOVE; 1631 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1632 1633 iscsit_start_nopin_timer(conn); 1634 return 0; 1635 } 1636 /* 1637 * Otherwise, initiator is not expecting a NOPIN is response. 1638 * Just ignore for now. 1639 */ 1640 return 0; 1641 } 1642 EXPORT_SYMBOL(iscsit_process_nop_out); 1643 1644 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1645 unsigned char *buf) 1646 { 1647 unsigned char *ping_data = NULL; 1648 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1649 struct kvec *iov = NULL; 1650 u32 payload_length = ntoh24(hdr->dlength); 1651 int ret; 1652 1653 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1654 if (ret < 0) 1655 return 0; 1656 /* 1657 * Handle NOP-OUT payload for traditional iSCSI sockets 1658 */ 1659 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1660 u32 checksum, data_crc, padding = 0; 1661 int niov = 0, rx_got, rx_size = payload_length; 1662 1663 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1664 if (!ping_data) { 1665 pr_err("Unable to allocate memory for" 1666 " NOPOUT ping data.\n"); 1667 ret = -1; 1668 goto out; 1669 } 1670 1671 iov = &cmd->iov_misc[0]; 1672 iov[niov].iov_base = ping_data; 1673 iov[niov++].iov_len = payload_length; 1674 1675 padding = ((-payload_length) & 3); 1676 if (padding != 0) { 1677 pr_debug("Receiving %u additional bytes" 1678 " for padding.\n", padding); 1679 iov[niov].iov_base = &cmd->pad_bytes; 1680 iov[niov++].iov_len = padding; 1681 rx_size += padding; 1682 } 1683 if (conn->conn_ops->DataDigest) { 1684 iov[niov].iov_base = &checksum; 1685 iov[niov++].iov_len = ISCSI_CRC_LEN; 1686 rx_size += ISCSI_CRC_LEN; 1687 } 1688 1689 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1690 if (rx_got != rx_size) { 1691 ret = -1; 1692 goto out; 1693 } 1694 1695 if (conn->conn_ops->DataDigest) { 1696 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1697 ping_data, payload_length, 1698 padding, cmd->pad_bytes, 1699 (u8 *)&data_crc); 1700 1701 if (checksum != data_crc) { 1702 pr_err("Ping data CRC32C DataDigest" 1703 " 0x%08x does not match computed 0x%08x\n", 1704 checksum, data_crc); 1705 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1706 pr_err("Unable to recover from" 1707 " NOPOUT Ping DataCRC failure while in" 1708 " ERL=0.\n"); 1709 ret = -1; 1710 goto out; 1711 } else { 1712 /* 1713 * Silently drop this PDU and let the 1714 * initiator plug the CmdSN gap. 1715 */ 1716 pr_debug("Dropping NOPOUT" 1717 " Command CmdSN: 0x%08x due to" 1718 " DataCRC error.\n", hdr->cmdsn); 1719 ret = 0; 1720 goto out; 1721 } 1722 } else { 1723 pr_debug("Got CRC32C DataDigest" 1724 " 0x%08x for %u bytes of ping data.\n", 1725 checksum, payload_length); 1726 } 1727 } 1728 1729 ping_data[payload_length] = '\0'; 1730 /* 1731 * Attach ping data to struct iscsi_cmd->buf_ptr. 1732 */ 1733 cmd->buf_ptr = ping_data; 1734 cmd->buf_ptr_size = payload_length; 1735 1736 pr_debug("Got %u bytes of NOPOUT ping" 1737 " data.\n", payload_length); 1738 pr_debug("Ping Data: \"%s\"\n", ping_data); 1739 } 1740 1741 return iscsit_process_nop_out(conn, cmd, hdr); 1742 out: 1743 if (cmd) 1744 iscsit_free_cmd(cmd, false); 1745 1746 kfree(ping_data); 1747 return ret; 1748 } 1749 1750 int 1751 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1752 unsigned char *buf) 1753 { 1754 struct se_tmr_req *se_tmr; 1755 struct iscsi_tmr_req *tmr_req; 1756 struct iscsi_tm *hdr; 1757 int out_of_order_cmdsn = 0, ret; 1758 bool sess_ref = false; 1759 u8 function; 1760 1761 hdr = (struct iscsi_tm *) buf; 1762 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1763 function = hdr->flags; 1764 1765 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1766 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1767 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1768 hdr->rtt, hdr->refcmdsn, conn->cid); 1769 1770 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1771 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1772 hdr->rtt != RESERVED_ITT)) { 1773 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1774 hdr->rtt = RESERVED_ITT; 1775 } 1776 1777 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1778 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1779 pr_err("Task Management Request TASK_REASSIGN not" 1780 " issued as immediate command, bad iSCSI Initiator" 1781 "implementation\n"); 1782 return iscsit_add_reject_cmd(cmd, 1783 ISCSI_REASON_PROTOCOL_ERROR, buf); 1784 } 1785 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1786 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1787 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1788 1789 cmd->data_direction = DMA_NONE; 1790 1791 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1792 if (!cmd->tmr_req) { 1793 pr_err("Unable to allocate memory for" 1794 " Task Management command!\n"); 1795 return iscsit_add_reject_cmd(cmd, 1796 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1797 buf); 1798 } 1799 1800 /* 1801 * TASK_REASSIGN for ERL=2 / connection stays inside of 1802 * LIO-Target $FABRIC_MOD 1803 */ 1804 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1805 1806 u8 tcm_function; 1807 int ret; 1808 1809 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1810 conn->sess->se_sess, 0, DMA_NONE, 1811 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 1812 1813 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1814 sess_ref = true; 1815 1816 switch (function) { 1817 case ISCSI_TM_FUNC_ABORT_TASK: 1818 tcm_function = TMR_ABORT_TASK; 1819 break; 1820 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1821 tcm_function = TMR_ABORT_TASK_SET; 1822 break; 1823 case ISCSI_TM_FUNC_CLEAR_ACA: 1824 tcm_function = TMR_CLEAR_ACA; 1825 break; 1826 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1827 tcm_function = TMR_CLEAR_TASK_SET; 1828 break; 1829 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1830 tcm_function = TMR_LUN_RESET; 1831 break; 1832 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1833 tcm_function = TMR_TARGET_WARM_RESET; 1834 break; 1835 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1836 tcm_function = TMR_TARGET_COLD_RESET; 1837 break; 1838 default: 1839 pr_err("Unknown iSCSI TMR Function:" 1840 " 0x%02x\n", function); 1841 return iscsit_add_reject_cmd(cmd, 1842 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1843 } 1844 1845 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1846 tcm_function, GFP_KERNEL); 1847 if (ret < 0) 1848 return iscsit_add_reject_cmd(cmd, 1849 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1850 1851 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1852 } 1853 1854 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1855 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1856 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1857 cmd->init_task_tag = hdr->itt; 1858 cmd->targ_xfer_tag = 0xFFFFFFFF; 1859 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1860 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1861 se_tmr = cmd->se_cmd.se_tmr_req; 1862 tmr_req = cmd->tmr_req; 1863 /* 1864 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1865 */ 1866 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1867 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1868 scsilun_to_int(&hdr->lun)); 1869 if (ret < 0) { 1870 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1871 goto attach; 1872 } 1873 } 1874 1875 switch (function) { 1876 case ISCSI_TM_FUNC_ABORT_TASK: 1877 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1878 if (se_tmr->response) 1879 goto attach; 1880 break; 1881 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1882 case ISCSI_TM_FUNC_CLEAR_ACA: 1883 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1884 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1885 break; 1886 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1887 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1888 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1889 goto attach; 1890 } 1891 break; 1892 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1893 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1894 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1895 goto attach; 1896 } 1897 break; 1898 case ISCSI_TM_FUNC_TASK_REASSIGN: 1899 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1900 /* 1901 * Perform sanity checks on the ExpDataSN only if the 1902 * TASK_REASSIGN was successful. 1903 */ 1904 if (se_tmr->response) 1905 break; 1906 1907 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1908 return iscsit_add_reject_cmd(cmd, 1909 ISCSI_REASON_BOOKMARK_INVALID, buf); 1910 break; 1911 default: 1912 pr_err("Unknown TMR function: 0x%02x, protocol" 1913 " error.\n", function); 1914 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1915 goto attach; 1916 } 1917 1918 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1919 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1920 se_tmr->call_transport = 1; 1921 attach: 1922 spin_lock_bh(&conn->cmd_lock); 1923 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1924 spin_unlock_bh(&conn->cmd_lock); 1925 1926 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1927 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1928 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1929 out_of_order_cmdsn = 1; 1930 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1931 return 0; 1932 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1933 return -1; 1934 } 1935 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1936 1937 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1938 return 0; 1939 /* 1940 * Found the referenced task, send to transport for processing. 1941 */ 1942 if (se_tmr->call_transport) 1943 return transport_generic_handle_tmr(&cmd->se_cmd); 1944 1945 /* 1946 * Could not find the referenced LUN, task, or Task Management 1947 * command not authorized or supported. Change state and 1948 * let the tx_thread send the response. 1949 * 1950 * For connection recovery, this is also the default action for 1951 * TMR TASK_REASSIGN. 1952 */ 1953 if (sess_ref) { 1954 pr_debug("Handle TMR, using sess_ref=true check\n"); 1955 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1956 } 1957 1958 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1959 return 0; 1960 } 1961 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1962 1963 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1964 int 1965 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1966 struct iscsi_text *hdr) 1967 { 1968 u32 payload_length = ntoh24(hdr->dlength); 1969 1970 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1971 pr_err("Unable to accept text parameter length: %u" 1972 "greater than MaxXmitDataSegmentLength %u.\n", 1973 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1974 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1975 (unsigned char *)hdr); 1976 } 1977 1978 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 1979 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 1980 pr_err("Multi sequence text commands currently not supported\n"); 1981 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 1982 (unsigned char *)hdr); 1983 } 1984 1985 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1986 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1987 hdr->exp_statsn, payload_length); 1988 1989 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1990 cmd->i_state = ISTATE_SEND_TEXTRSP; 1991 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1992 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1993 cmd->targ_xfer_tag = 0xFFFFFFFF; 1994 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1995 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1996 cmd->data_direction = DMA_NONE; 1997 cmd->text_in_ptr = NULL; 1998 1999 return 0; 2000 } 2001 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2002 2003 int 2004 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2005 struct iscsi_text *hdr) 2006 { 2007 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2008 int cmdsn_ret; 2009 2010 if (!text_in) { 2011 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2012 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2013 pr_err("Unable to locate text_in buffer for sendtargets" 2014 " discovery\n"); 2015 goto reject; 2016 } 2017 goto empty_sendtargets; 2018 } 2019 if (strncmp("SendTargets", text_in, 11) != 0) { 2020 pr_err("Received Text Data that is not" 2021 " SendTargets, cannot continue.\n"); 2022 goto reject; 2023 } 2024 text_ptr = strchr(text_in, '='); 2025 if (!text_ptr) { 2026 pr_err("No \"=\" separator found in Text Data," 2027 " cannot continue.\n"); 2028 goto reject; 2029 } 2030 if (!strncmp("=All", text_ptr, 4)) { 2031 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2032 } else if (!strncmp("=iqn.", text_ptr, 5) || 2033 !strncmp("=eui.", text_ptr, 5)) { 2034 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2035 } else { 2036 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2037 goto reject; 2038 } 2039 2040 spin_lock_bh(&conn->cmd_lock); 2041 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2042 spin_unlock_bh(&conn->cmd_lock); 2043 2044 empty_sendtargets: 2045 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2046 2047 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2048 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2049 (unsigned char *)hdr, hdr->cmdsn); 2050 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2051 return -1; 2052 2053 return 0; 2054 } 2055 2056 return iscsit_execute_cmd(cmd, 0); 2057 2058 reject: 2059 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2060 (unsigned char *)hdr); 2061 } 2062 EXPORT_SYMBOL(iscsit_process_text_cmd); 2063 2064 static int 2065 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2066 unsigned char *buf) 2067 { 2068 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2069 char *text_in = NULL; 2070 u32 payload_length = ntoh24(hdr->dlength); 2071 int rx_size, rc; 2072 2073 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2074 if (rc < 0) 2075 return 0; 2076 2077 rx_size = payload_length; 2078 if (payload_length) { 2079 u32 checksum = 0, data_crc = 0; 2080 u32 padding = 0, pad_bytes = 0; 2081 int niov = 0, rx_got; 2082 struct kvec iov[3]; 2083 2084 text_in = kzalloc(payload_length, GFP_KERNEL); 2085 if (!text_in) { 2086 pr_err("Unable to allocate memory for" 2087 " incoming text parameters\n"); 2088 goto reject; 2089 } 2090 cmd->text_in_ptr = text_in; 2091 2092 memset(iov, 0, 3 * sizeof(struct kvec)); 2093 iov[niov].iov_base = text_in; 2094 iov[niov++].iov_len = payload_length; 2095 2096 padding = ((-payload_length) & 3); 2097 if (padding != 0) { 2098 iov[niov].iov_base = &pad_bytes; 2099 iov[niov++].iov_len = padding; 2100 rx_size += padding; 2101 pr_debug("Receiving %u additional bytes" 2102 " for padding.\n", padding); 2103 } 2104 if (conn->conn_ops->DataDigest) { 2105 iov[niov].iov_base = &checksum; 2106 iov[niov++].iov_len = ISCSI_CRC_LEN; 2107 rx_size += ISCSI_CRC_LEN; 2108 } 2109 2110 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2111 if (rx_got != rx_size) 2112 goto reject; 2113 2114 if (conn->conn_ops->DataDigest) { 2115 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2116 text_in, payload_length, 2117 padding, (u8 *)&pad_bytes, 2118 (u8 *)&data_crc); 2119 2120 if (checksum != data_crc) { 2121 pr_err("Text data CRC32C DataDigest" 2122 " 0x%08x does not match computed" 2123 " 0x%08x\n", checksum, data_crc); 2124 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2125 pr_err("Unable to recover from" 2126 " Text Data digest failure while in" 2127 " ERL=0.\n"); 2128 goto reject; 2129 } else { 2130 /* 2131 * Silently drop this PDU and let the 2132 * initiator plug the CmdSN gap. 2133 */ 2134 pr_debug("Dropping Text" 2135 " Command CmdSN: 0x%08x due to" 2136 " DataCRC error.\n", hdr->cmdsn); 2137 kfree(text_in); 2138 return 0; 2139 } 2140 } else { 2141 pr_debug("Got CRC32C DataDigest" 2142 " 0x%08x for %u bytes of text data.\n", 2143 checksum, payload_length); 2144 } 2145 } 2146 text_in[payload_length - 1] = '\0'; 2147 pr_debug("Successfully read %d bytes of text" 2148 " data.\n", payload_length); 2149 } 2150 2151 return iscsit_process_text_cmd(conn, cmd, hdr); 2152 2153 reject: 2154 kfree(cmd->text_in_ptr); 2155 cmd->text_in_ptr = NULL; 2156 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2157 } 2158 2159 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2160 { 2161 struct iscsi_conn *conn_p; 2162 struct iscsi_session *sess = conn->sess; 2163 2164 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2165 " for SID: %u.\n", conn->cid, conn->sess->sid); 2166 2167 atomic_set(&sess->session_logout, 1); 2168 atomic_set(&conn->conn_logout_remove, 1); 2169 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2170 2171 iscsit_inc_conn_usage_count(conn); 2172 iscsit_inc_session_usage_count(sess); 2173 2174 spin_lock_bh(&sess->conn_lock); 2175 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2176 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2177 continue; 2178 2179 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2180 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2181 } 2182 spin_unlock_bh(&sess->conn_lock); 2183 2184 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2185 2186 return 0; 2187 } 2188 2189 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2190 { 2191 struct iscsi_conn *l_conn; 2192 struct iscsi_session *sess = conn->sess; 2193 2194 pr_debug("Received logout request CLOSECONNECTION for CID:" 2195 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2196 2197 /* 2198 * A Logout Request with a CLOSECONNECTION reason code for a CID 2199 * can arrive on a connection with a differing CID. 2200 */ 2201 if (conn->cid == cmd->logout_cid) { 2202 spin_lock_bh(&conn->state_lock); 2203 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2204 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2205 2206 atomic_set(&conn->conn_logout_remove, 1); 2207 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2208 iscsit_inc_conn_usage_count(conn); 2209 2210 spin_unlock_bh(&conn->state_lock); 2211 } else { 2212 /* 2213 * Handle all different cid CLOSECONNECTION requests in 2214 * iscsit_logout_post_handler_diffcid() as to give enough 2215 * time for any non immediate command's CmdSN to be 2216 * acknowledged on the connection in question. 2217 * 2218 * Here we simply make sure the CID is still around. 2219 */ 2220 l_conn = iscsit_get_conn_from_cid(sess, 2221 cmd->logout_cid); 2222 if (!l_conn) { 2223 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2224 iscsit_add_cmd_to_response_queue(cmd, conn, 2225 cmd->i_state); 2226 return 0; 2227 } 2228 2229 iscsit_dec_conn_usage_count(l_conn); 2230 } 2231 2232 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2233 2234 return 0; 2235 } 2236 2237 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2238 { 2239 struct iscsi_session *sess = conn->sess; 2240 2241 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2242 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2243 2244 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2245 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2246 " while ERL!=2.\n"); 2247 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2248 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2249 return 0; 2250 } 2251 2252 if (conn->cid == cmd->logout_cid) { 2253 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2254 " with CID: %hu on CID: %hu, implementation error.\n", 2255 cmd->logout_cid, conn->cid); 2256 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2257 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2258 return 0; 2259 } 2260 2261 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2262 2263 return 0; 2264 } 2265 2266 int 2267 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2268 unsigned char *buf) 2269 { 2270 int cmdsn_ret, logout_remove = 0; 2271 u8 reason_code = 0; 2272 struct iscsi_logout *hdr; 2273 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2274 2275 hdr = (struct iscsi_logout *) buf; 2276 reason_code = (hdr->flags & 0x7f); 2277 2278 if (tiqn) { 2279 spin_lock(&tiqn->logout_stats.lock); 2280 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2281 tiqn->logout_stats.normal_logouts++; 2282 else 2283 tiqn->logout_stats.abnormal_logouts++; 2284 spin_unlock(&tiqn->logout_stats.lock); 2285 } 2286 2287 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2288 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2289 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2290 hdr->cid, conn->cid); 2291 2292 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2293 pr_err("Received logout request on connection that" 2294 " is not in logged in state, ignoring request.\n"); 2295 iscsit_free_cmd(cmd, false); 2296 return 0; 2297 } 2298 2299 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2300 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2301 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2302 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2303 cmd->targ_xfer_tag = 0xFFFFFFFF; 2304 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2305 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2306 cmd->logout_cid = be16_to_cpu(hdr->cid); 2307 cmd->logout_reason = reason_code; 2308 cmd->data_direction = DMA_NONE; 2309 2310 /* 2311 * We need to sleep in these cases (by returning 1) until the Logout 2312 * Response gets sent in the tx thread. 2313 */ 2314 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2315 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2316 be16_to_cpu(hdr->cid) == conn->cid)) 2317 logout_remove = 1; 2318 2319 spin_lock_bh(&conn->cmd_lock); 2320 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2321 spin_unlock_bh(&conn->cmd_lock); 2322 2323 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2324 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2325 2326 /* 2327 * Immediate commands are executed, well, immediately. 2328 * Non-Immediate Logout Commands are executed in CmdSN order. 2329 */ 2330 if (cmd->immediate_cmd) { 2331 int ret = iscsit_execute_cmd(cmd, 0); 2332 2333 if (ret < 0) 2334 return ret; 2335 } else { 2336 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2337 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2338 logout_remove = 0; 2339 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2340 return -1; 2341 } 2342 2343 return logout_remove; 2344 } 2345 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2346 2347 static int iscsit_handle_snack( 2348 struct iscsi_conn *conn, 2349 unsigned char *buf) 2350 { 2351 struct iscsi_snack *hdr; 2352 2353 hdr = (struct iscsi_snack *) buf; 2354 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2355 2356 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2357 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2358 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2359 hdr->begrun, hdr->runlength, conn->cid); 2360 2361 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2362 pr_err("Initiator sent SNACK request while in" 2363 " ErrorRecoveryLevel=0.\n"); 2364 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2365 buf); 2366 } 2367 /* 2368 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2369 * call from inside iscsi_send_recovery_datain_or_r2t(). 2370 */ 2371 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2372 case 0: 2373 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2374 hdr->itt, 2375 be32_to_cpu(hdr->ttt), 2376 be32_to_cpu(hdr->begrun), 2377 be32_to_cpu(hdr->runlength)); 2378 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2379 return iscsit_handle_status_snack(conn, hdr->itt, 2380 be32_to_cpu(hdr->ttt), 2381 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2382 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2383 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2384 be32_to_cpu(hdr->begrun), 2385 be32_to_cpu(hdr->runlength)); 2386 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2387 /* FIXME: Support R-Data SNACK */ 2388 pr_err("R-Data SNACK Not Supported.\n"); 2389 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2390 buf); 2391 default: 2392 pr_err("Unknown SNACK type 0x%02x, protocol" 2393 " error.\n", hdr->flags & 0x0f); 2394 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2395 buf); 2396 } 2397 2398 return 0; 2399 } 2400 2401 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2402 { 2403 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2404 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2405 wait_for_completion_interruptible_timeout( 2406 &conn->rx_half_close_comp, 2407 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2408 } 2409 } 2410 2411 static int iscsit_handle_immediate_data( 2412 struct iscsi_cmd *cmd, 2413 struct iscsi_scsi_req *hdr, 2414 u32 length) 2415 { 2416 int iov_ret, rx_got = 0, rx_size = 0; 2417 u32 checksum, iov_count = 0, padding = 0; 2418 struct iscsi_conn *conn = cmd->conn; 2419 struct kvec *iov; 2420 2421 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2422 if (iov_ret < 0) 2423 return IMMEDIATE_DATA_CANNOT_RECOVER; 2424 2425 rx_size = length; 2426 iov_count = iov_ret; 2427 iov = &cmd->iov_data[0]; 2428 2429 padding = ((-length) & 3); 2430 if (padding != 0) { 2431 iov[iov_count].iov_base = cmd->pad_bytes; 2432 iov[iov_count++].iov_len = padding; 2433 rx_size += padding; 2434 } 2435 2436 if (conn->conn_ops->DataDigest) { 2437 iov[iov_count].iov_base = &checksum; 2438 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2439 rx_size += ISCSI_CRC_LEN; 2440 } 2441 2442 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2443 2444 iscsit_unmap_iovec(cmd); 2445 2446 if (rx_got != rx_size) { 2447 iscsit_rx_thread_wait_for_tcp(conn); 2448 return IMMEDIATE_DATA_CANNOT_RECOVER; 2449 } 2450 2451 if (conn->conn_ops->DataDigest) { 2452 u32 data_crc; 2453 2454 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2455 cmd->write_data_done, length, padding, 2456 cmd->pad_bytes); 2457 2458 if (checksum != data_crc) { 2459 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2460 " does not match computed 0x%08x\n", checksum, 2461 data_crc); 2462 2463 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2464 pr_err("Unable to recover from" 2465 " Immediate Data digest failure while" 2466 " in ERL=0.\n"); 2467 iscsit_reject_cmd(cmd, 2468 ISCSI_REASON_DATA_DIGEST_ERROR, 2469 (unsigned char *)hdr); 2470 return IMMEDIATE_DATA_CANNOT_RECOVER; 2471 } else { 2472 iscsit_reject_cmd(cmd, 2473 ISCSI_REASON_DATA_DIGEST_ERROR, 2474 (unsigned char *)hdr); 2475 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2476 } 2477 } else { 2478 pr_debug("Got CRC32C DataDigest 0x%08x for" 2479 " %u bytes of Immediate Data\n", checksum, 2480 length); 2481 } 2482 } 2483 2484 cmd->write_data_done += length; 2485 2486 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2487 spin_lock_bh(&cmd->istate_lock); 2488 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2489 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2490 spin_unlock_bh(&cmd->istate_lock); 2491 } 2492 2493 return IMMEDIATE_DATA_NORMAL_OPERATION; 2494 } 2495 2496 /* 2497 * Called with sess->conn_lock held. 2498 */ 2499 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2500 with active network interface */ 2501 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2502 { 2503 struct iscsi_cmd *cmd; 2504 struct iscsi_conn *conn_p; 2505 bool found = false; 2506 2507 /* 2508 * Only send a Asynchronous Message on connections whos network 2509 * interface is still functional. 2510 */ 2511 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2512 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2513 iscsit_inc_conn_usage_count(conn_p); 2514 found = true; 2515 break; 2516 } 2517 } 2518 2519 if (!found) 2520 return; 2521 2522 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2523 if (!cmd) { 2524 iscsit_dec_conn_usage_count(conn_p); 2525 return; 2526 } 2527 2528 cmd->logout_cid = conn->cid; 2529 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2530 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2531 2532 spin_lock_bh(&conn_p->cmd_lock); 2533 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2534 spin_unlock_bh(&conn_p->cmd_lock); 2535 2536 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2537 iscsit_dec_conn_usage_count(conn_p); 2538 } 2539 2540 static int iscsit_send_conn_drop_async_message( 2541 struct iscsi_cmd *cmd, 2542 struct iscsi_conn *conn) 2543 { 2544 struct iscsi_async *hdr; 2545 2546 cmd->tx_size = ISCSI_HDR_LEN; 2547 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2548 2549 hdr = (struct iscsi_async *) cmd->pdu; 2550 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2551 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2552 cmd->init_task_tag = RESERVED_ITT; 2553 cmd->targ_xfer_tag = 0xFFFFFFFF; 2554 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2555 cmd->stat_sn = conn->stat_sn++; 2556 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2558 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2559 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2560 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2561 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2562 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2563 2564 if (conn->conn_ops->HeaderDigest) { 2565 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2566 2567 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2568 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2569 2570 cmd->tx_size += ISCSI_CRC_LEN; 2571 pr_debug("Attaching CRC32C HeaderDigest to" 2572 " Async Message 0x%08x\n", *header_digest); 2573 } 2574 2575 cmd->iov_misc[0].iov_base = cmd->pdu; 2576 cmd->iov_misc[0].iov_len = cmd->tx_size; 2577 cmd->iov_misc_count = 1; 2578 2579 pr_debug("Sending Connection Dropped Async Message StatSN:" 2580 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2581 cmd->logout_cid, conn->cid); 2582 return 0; 2583 } 2584 2585 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2586 { 2587 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2588 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2589 wait_for_completion_interruptible_timeout( 2590 &conn->tx_half_close_comp, 2591 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2592 } 2593 } 2594 2595 static void 2596 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2597 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2598 bool set_statsn) 2599 { 2600 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2601 hdr->flags = datain->flags; 2602 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2603 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2604 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2605 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2606 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2607 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2608 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2609 } 2610 } 2611 hton24(hdr->dlength, datain->length); 2612 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2613 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2614 (struct scsi_lun *)&hdr->lun); 2615 else 2616 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2617 2618 hdr->itt = cmd->init_task_tag; 2619 2620 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2621 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2622 else 2623 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2624 if (set_statsn) 2625 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2626 else 2627 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2628 2629 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2630 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2631 hdr->datasn = cpu_to_be32(datain->data_sn); 2632 hdr->offset = cpu_to_be32(datain->offset); 2633 2634 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2635 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2636 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2637 ntohl(hdr->offset), datain->length, conn->cid); 2638 } 2639 2640 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2641 { 2642 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2643 struct iscsi_datain datain; 2644 struct iscsi_datain_req *dr; 2645 struct kvec *iov; 2646 u32 iov_count = 0, tx_size = 0; 2647 int eodr = 0, ret, iov_ret; 2648 bool set_statsn = false; 2649 2650 memset(&datain, 0, sizeof(struct iscsi_datain)); 2651 dr = iscsit_get_datain_values(cmd, &datain); 2652 if (!dr) { 2653 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2654 cmd->init_task_tag); 2655 return -1; 2656 } 2657 /* 2658 * Be paranoid and double check the logic for now. 2659 */ 2660 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2661 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2662 " datain.length: %u exceeds cmd->data_length: %u\n", 2663 cmd->init_task_tag, datain.offset, datain.length, 2664 cmd->se_cmd.data_length); 2665 return -1; 2666 } 2667 2668 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2669 /* 2670 * Special case for successfully execution w/ both DATAIN 2671 * and Sense Data. 2672 */ 2673 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2674 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2675 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2676 else { 2677 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2678 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2679 iscsit_increment_maxcmdsn(cmd, conn->sess); 2680 cmd->stat_sn = conn->stat_sn++; 2681 set_statsn = true; 2682 } else if (dr->dr_complete == 2683 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2684 set_statsn = true; 2685 } 2686 2687 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2688 2689 iov = &cmd->iov_data[0]; 2690 iov[iov_count].iov_base = cmd->pdu; 2691 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2692 tx_size += ISCSI_HDR_LEN; 2693 2694 if (conn->conn_ops->HeaderDigest) { 2695 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2696 2697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2698 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2699 2700 iov[0].iov_len += ISCSI_CRC_LEN; 2701 tx_size += ISCSI_CRC_LEN; 2702 2703 pr_debug("Attaching CRC32 HeaderDigest" 2704 " for DataIN PDU 0x%08x\n", *header_digest); 2705 } 2706 2707 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2708 datain.offset, datain.length); 2709 if (iov_ret < 0) 2710 return -1; 2711 2712 iov_count += iov_ret; 2713 tx_size += datain.length; 2714 2715 cmd->padding = ((-datain.length) & 3); 2716 if (cmd->padding) { 2717 iov[iov_count].iov_base = cmd->pad_bytes; 2718 iov[iov_count++].iov_len = cmd->padding; 2719 tx_size += cmd->padding; 2720 2721 pr_debug("Attaching %u padding bytes\n", 2722 cmd->padding); 2723 } 2724 if (conn->conn_ops->DataDigest) { 2725 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2726 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2727 2728 iov[iov_count].iov_base = &cmd->data_crc; 2729 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2730 tx_size += ISCSI_CRC_LEN; 2731 2732 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2733 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2734 } 2735 2736 cmd->iov_data_count = iov_count; 2737 cmd->tx_size = tx_size; 2738 2739 /* sendpage is preferred but can't insert markers */ 2740 if (!conn->conn_ops->IFMarker) 2741 ret = iscsit_fe_sendpage_sg(cmd, conn); 2742 else 2743 ret = iscsit_send_tx_data(cmd, conn, 0); 2744 2745 iscsit_unmap_iovec(cmd); 2746 2747 if (ret < 0) { 2748 iscsit_tx_thread_wait_for_tcp(conn); 2749 return ret; 2750 } 2751 2752 if (dr->dr_complete) { 2753 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2754 2 : 1; 2755 iscsit_free_datain_req(cmd, dr); 2756 } 2757 2758 return eodr; 2759 } 2760 2761 int 2762 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2763 struct iscsi_logout_rsp *hdr) 2764 { 2765 struct iscsi_conn *logout_conn = NULL; 2766 struct iscsi_conn_recovery *cr = NULL; 2767 struct iscsi_session *sess = conn->sess; 2768 /* 2769 * The actual shutting down of Sessions and/or Connections 2770 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2771 * is done in scsi_logout_post_handler(). 2772 */ 2773 switch (cmd->logout_reason) { 2774 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2775 pr_debug("iSCSI session logout successful, setting" 2776 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2777 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2778 break; 2779 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2780 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2781 break; 2782 /* 2783 * For CLOSECONNECTION logout requests carrying 2784 * a matching logout CID -> local CID, the reference 2785 * for the local CID will have been incremented in 2786 * iscsi_logout_closeconnection(). 2787 * 2788 * For CLOSECONNECTION logout requests carrying 2789 * a different CID than the connection it arrived 2790 * on, the connection responding to cmd->logout_cid 2791 * is stopped in iscsit_logout_post_handler_diffcid(). 2792 */ 2793 2794 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2795 " successful.\n", cmd->logout_cid, conn->cid); 2796 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2797 break; 2798 case ISCSI_LOGOUT_REASON_RECOVERY: 2799 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2800 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2801 break; 2802 /* 2803 * If the connection is still active from our point of view 2804 * force connection recovery to occur. 2805 */ 2806 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2807 cmd->logout_cid); 2808 if (logout_conn) { 2809 iscsit_connection_reinstatement_rcfr(logout_conn); 2810 iscsit_dec_conn_usage_count(logout_conn); 2811 } 2812 2813 cr = iscsit_get_inactive_connection_recovery_entry( 2814 conn->sess, cmd->logout_cid); 2815 if (!cr) { 2816 pr_err("Unable to locate CID: %hu for" 2817 " REMOVECONNFORRECOVERY Logout Request.\n", 2818 cmd->logout_cid); 2819 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2820 break; 2821 } 2822 2823 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2824 2825 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2826 " for recovery for CID: %hu on CID: %hu successful.\n", 2827 cmd->logout_cid, conn->cid); 2828 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2829 break; 2830 default: 2831 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2832 cmd->logout_reason); 2833 return -1; 2834 } 2835 2836 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2837 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2838 hdr->response = cmd->logout_response; 2839 hdr->itt = cmd->init_task_tag; 2840 cmd->stat_sn = conn->stat_sn++; 2841 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2842 2843 iscsit_increment_maxcmdsn(cmd, conn->sess); 2844 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2845 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2846 2847 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2848 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2849 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2850 cmd->logout_cid, conn->cid); 2851 2852 return 0; 2853 } 2854 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2855 2856 static int 2857 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2858 { 2859 struct kvec *iov; 2860 int niov = 0, tx_size, rc; 2861 2862 rc = iscsit_build_logout_rsp(cmd, conn, 2863 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2864 if (rc < 0) 2865 return rc; 2866 2867 tx_size = ISCSI_HDR_LEN; 2868 iov = &cmd->iov_misc[0]; 2869 iov[niov].iov_base = cmd->pdu; 2870 iov[niov++].iov_len = ISCSI_HDR_LEN; 2871 2872 if (conn->conn_ops->HeaderDigest) { 2873 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2874 2875 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2876 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2877 2878 iov[0].iov_len += ISCSI_CRC_LEN; 2879 tx_size += ISCSI_CRC_LEN; 2880 pr_debug("Attaching CRC32C HeaderDigest to" 2881 " Logout Response 0x%08x\n", *header_digest); 2882 } 2883 cmd->iov_misc_count = niov; 2884 cmd->tx_size = tx_size; 2885 2886 return 0; 2887 } 2888 2889 void 2890 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2891 struct iscsi_nopin *hdr, bool nopout_response) 2892 { 2893 hdr->opcode = ISCSI_OP_NOOP_IN; 2894 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2895 hton24(hdr->dlength, cmd->buf_ptr_size); 2896 if (nopout_response) 2897 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2898 hdr->itt = cmd->init_task_tag; 2899 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2900 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2901 conn->stat_sn; 2902 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2903 2904 if (nopout_response) 2905 iscsit_increment_maxcmdsn(cmd, conn->sess); 2906 2907 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2908 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2909 2910 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2911 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2912 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2913 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2914 } 2915 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2916 2917 /* 2918 * Unsolicited NOPIN, either requesting a response or not. 2919 */ 2920 static int iscsit_send_unsolicited_nopin( 2921 struct iscsi_cmd *cmd, 2922 struct iscsi_conn *conn, 2923 int want_response) 2924 { 2925 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2926 int tx_size = ISCSI_HDR_LEN, ret; 2927 2928 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2929 2930 if (conn->conn_ops->HeaderDigest) { 2931 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2932 2933 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2934 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2935 2936 tx_size += ISCSI_CRC_LEN; 2937 pr_debug("Attaching CRC32C HeaderDigest to" 2938 " NopIN 0x%08x\n", *header_digest); 2939 } 2940 2941 cmd->iov_misc[0].iov_base = cmd->pdu; 2942 cmd->iov_misc[0].iov_len = tx_size; 2943 cmd->iov_misc_count = 1; 2944 cmd->tx_size = tx_size; 2945 2946 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2947 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2948 2949 ret = iscsit_send_tx_data(cmd, conn, 1); 2950 if (ret < 0) { 2951 iscsit_tx_thread_wait_for_tcp(conn); 2952 return ret; 2953 } 2954 2955 spin_lock_bh(&cmd->istate_lock); 2956 cmd->i_state = want_response ? 2957 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2958 spin_unlock_bh(&cmd->istate_lock); 2959 2960 return 0; 2961 } 2962 2963 static int 2964 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2965 { 2966 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2967 struct kvec *iov; 2968 u32 padding = 0; 2969 int niov = 0, tx_size; 2970 2971 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2972 2973 tx_size = ISCSI_HDR_LEN; 2974 iov = &cmd->iov_misc[0]; 2975 iov[niov].iov_base = cmd->pdu; 2976 iov[niov++].iov_len = ISCSI_HDR_LEN; 2977 2978 if (conn->conn_ops->HeaderDigest) { 2979 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2980 2981 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2982 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2983 2984 iov[0].iov_len += ISCSI_CRC_LEN; 2985 tx_size += ISCSI_CRC_LEN; 2986 pr_debug("Attaching CRC32C HeaderDigest" 2987 " to NopIn 0x%08x\n", *header_digest); 2988 } 2989 2990 /* 2991 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2992 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2993 */ 2994 if (cmd->buf_ptr_size) { 2995 iov[niov].iov_base = cmd->buf_ptr; 2996 iov[niov++].iov_len = cmd->buf_ptr_size; 2997 tx_size += cmd->buf_ptr_size; 2998 2999 pr_debug("Echoing back %u bytes of ping" 3000 " data.\n", cmd->buf_ptr_size); 3001 3002 padding = ((-cmd->buf_ptr_size) & 3); 3003 if (padding != 0) { 3004 iov[niov].iov_base = &cmd->pad_bytes; 3005 iov[niov++].iov_len = padding; 3006 tx_size += padding; 3007 pr_debug("Attaching %u additional" 3008 " padding bytes.\n", padding); 3009 } 3010 if (conn->conn_ops->DataDigest) { 3011 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3012 cmd->buf_ptr, cmd->buf_ptr_size, 3013 padding, (u8 *)&cmd->pad_bytes, 3014 (u8 *)&cmd->data_crc); 3015 3016 iov[niov].iov_base = &cmd->data_crc; 3017 iov[niov++].iov_len = ISCSI_CRC_LEN; 3018 tx_size += ISCSI_CRC_LEN; 3019 pr_debug("Attached DataDigest for %u" 3020 " bytes of ping data, CRC 0x%08x\n", 3021 cmd->buf_ptr_size, cmd->data_crc); 3022 } 3023 } 3024 3025 cmd->iov_misc_count = niov; 3026 cmd->tx_size = tx_size; 3027 3028 return 0; 3029 } 3030 3031 static int iscsit_send_r2t( 3032 struct iscsi_cmd *cmd, 3033 struct iscsi_conn *conn) 3034 { 3035 int tx_size = 0; 3036 struct iscsi_r2t *r2t; 3037 struct iscsi_r2t_rsp *hdr; 3038 int ret; 3039 3040 r2t = iscsit_get_r2t_from_list(cmd); 3041 if (!r2t) 3042 return -1; 3043 3044 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3045 memset(hdr, 0, ISCSI_HDR_LEN); 3046 hdr->opcode = ISCSI_OP_R2T; 3047 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3048 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3049 (struct scsi_lun *)&hdr->lun); 3050 hdr->itt = cmd->init_task_tag; 3051 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3052 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3053 hdr->statsn = cpu_to_be32(conn->stat_sn); 3054 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3055 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3056 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3057 hdr->data_offset = cpu_to_be32(r2t->offset); 3058 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3059 3060 cmd->iov_misc[0].iov_base = cmd->pdu; 3061 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3062 tx_size += ISCSI_HDR_LEN; 3063 3064 if (conn->conn_ops->HeaderDigest) { 3065 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3066 3067 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3068 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3069 3070 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3071 tx_size += ISCSI_CRC_LEN; 3072 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3073 " PDU 0x%08x\n", *header_digest); 3074 } 3075 3076 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3077 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3078 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3079 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3080 r2t->offset, r2t->xfer_len, conn->cid); 3081 3082 cmd->iov_misc_count = 1; 3083 cmd->tx_size = tx_size; 3084 3085 spin_lock_bh(&cmd->r2t_lock); 3086 r2t->sent_r2t = 1; 3087 spin_unlock_bh(&cmd->r2t_lock); 3088 3089 ret = iscsit_send_tx_data(cmd, conn, 1); 3090 if (ret < 0) { 3091 iscsit_tx_thread_wait_for_tcp(conn); 3092 return ret; 3093 } 3094 3095 spin_lock_bh(&cmd->dataout_timeout_lock); 3096 iscsit_start_dataout_timer(cmd, conn); 3097 spin_unlock_bh(&cmd->dataout_timeout_lock); 3098 3099 return 0; 3100 } 3101 3102 /* 3103 * @recovery: If called from iscsi_task_reassign_complete_write() for 3104 * connection recovery. 3105 */ 3106 int iscsit_build_r2ts_for_cmd( 3107 struct iscsi_conn *conn, 3108 struct iscsi_cmd *cmd, 3109 bool recovery) 3110 { 3111 int first_r2t = 1; 3112 u32 offset = 0, xfer_len = 0; 3113 3114 spin_lock_bh(&cmd->r2t_lock); 3115 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3116 spin_unlock_bh(&cmd->r2t_lock); 3117 return 0; 3118 } 3119 3120 if (conn->sess->sess_ops->DataSequenceInOrder && 3121 !recovery) 3122 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3123 3124 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3125 if (conn->sess->sess_ops->DataSequenceInOrder) { 3126 offset = cmd->r2t_offset; 3127 3128 if (first_r2t && recovery) { 3129 int new_data_end = offset + 3130 conn->sess->sess_ops->MaxBurstLength - 3131 cmd->next_burst_len; 3132 3133 if (new_data_end > cmd->se_cmd.data_length) 3134 xfer_len = cmd->se_cmd.data_length - offset; 3135 else 3136 xfer_len = 3137 conn->sess->sess_ops->MaxBurstLength - 3138 cmd->next_burst_len; 3139 } else { 3140 int new_data_end = offset + 3141 conn->sess->sess_ops->MaxBurstLength; 3142 3143 if (new_data_end > cmd->se_cmd.data_length) 3144 xfer_len = cmd->se_cmd.data_length - offset; 3145 else 3146 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3147 } 3148 cmd->r2t_offset += xfer_len; 3149 3150 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3151 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3152 } else { 3153 struct iscsi_seq *seq; 3154 3155 seq = iscsit_get_seq_holder_for_r2t(cmd); 3156 if (!seq) { 3157 spin_unlock_bh(&cmd->r2t_lock); 3158 return -1; 3159 } 3160 3161 offset = seq->offset; 3162 xfer_len = seq->xfer_len; 3163 3164 if (cmd->seq_send_order == cmd->seq_count) 3165 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3166 } 3167 cmd->outstanding_r2ts++; 3168 first_r2t = 0; 3169 3170 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3171 spin_unlock_bh(&cmd->r2t_lock); 3172 return -1; 3173 } 3174 3175 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3176 break; 3177 } 3178 spin_unlock_bh(&cmd->r2t_lock); 3179 3180 return 0; 3181 } 3182 3183 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3184 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3185 { 3186 if (inc_stat_sn) 3187 cmd->stat_sn = conn->stat_sn++; 3188 3189 atomic_long_inc(&conn->sess->rsp_pdus); 3190 3191 memset(hdr, 0, ISCSI_HDR_LEN); 3192 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3193 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3194 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3195 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3196 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3197 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3198 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3199 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3200 } 3201 hdr->response = cmd->iscsi_response; 3202 hdr->cmd_status = cmd->se_cmd.scsi_status; 3203 hdr->itt = cmd->init_task_tag; 3204 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3205 3206 iscsit_increment_maxcmdsn(cmd, conn->sess); 3207 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3208 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3209 3210 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3211 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3212 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3213 cmd->se_cmd.scsi_status, conn->cid); 3214 } 3215 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3216 3217 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3218 { 3219 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3220 struct kvec *iov; 3221 u32 padding = 0, tx_size = 0; 3222 int iov_count = 0; 3223 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3224 3225 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3226 3227 iov = &cmd->iov_misc[0]; 3228 iov[iov_count].iov_base = cmd->pdu; 3229 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3230 tx_size += ISCSI_HDR_LEN; 3231 3232 /* 3233 * Attach SENSE DATA payload to iSCSI Response PDU 3234 */ 3235 if (cmd->se_cmd.sense_buffer && 3236 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3237 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3238 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3239 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3240 3241 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3242 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3243 iov[iov_count].iov_base = cmd->sense_buffer; 3244 iov[iov_count++].iov_len = 3245 (cmd->se_cmd.scsi_sense_length + padding); 3246 tx_size += cmd->se_cmd.scsi_sense_length; 3247 3248 if (padding) { 3249 memset(cmd->sense_buffer + 3250 cmd->se_cmd.scsi_sense_length, 0, padding); 3251 tx_size += padding; 3252 pr_debug("Adding %u bytes of padding to" 3253 " SENSE.\n", padding); 3254 } 3255 3256 if (conn->conn_ops->DataDigest) { 3257 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3258 cmd->sense_buffer, 3259 (cmd->se_cmd.scsi_sense_length + padding), 3260 0, NULL, (u8 *)&cmd->data_crc); 3261 3262 iov[iov_count].iov_base = &cmd->data_crc; 3263 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3264 tx_size += ISCSI_CRC_LEN; 3265 3266 pr_debug("Attaching CRC32 DataDigest for" 3267 " SENSE, %u bytes CRC 0x%08x\n", 3268 (cmd->se_cmd.scsi_sense_length + padding), 3269 cmd->data_crc); 3270 } 3271 3272 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3273 " Response PDU\n", 3274 cmd->se_cmd.scsi_sense_length); 3275 } 3276 3277 if (conn->conn_ops->HeaderDigest) { 3278 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3279 3280 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3281 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3282 3283 iov[0].iov_len += ISCSI_CRC_LEN; 3284 tx_size += ISCSI_CRC_LEN; 3285 pr_debug("Attaching CRC32 HeaderDigest for Response" 3286 " PDU 0x%08x\n", *header_digest); 3287 } 3288 3289 cmd->iov_misc_count = iov_count; 3290 cmd->tx_size = tx_size; 3291 3292 return 0; 3293 } 3294 3295 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3296 { 3297 switch (se_tmr->response) { 3298 case TMR_FUNCTION_COMPLETE: 3299 return ISCSI_TMF_RSP_COMPLETE; 3300 case TMR_TASK_DOES_NOT_EXIST: 3301 return ISCSI_TMF_RSP_NO_TASK; 3302 case TMR_LUN_DOES_NOT_EXIST: 3303 return ISCSI_TMF_RSP_NO_LUN; 3304 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3305 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3306 case TMR_FUNCTION_REJECTED: 3307 default: 3308 return ISCSI_TMF_RSP_REJECTED; 3309 } 3310 } 3311 3312 void 3313 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3314 struct iscsi_tm_rsp *hdr) 3315 { 3316 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3317 3318 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3319 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3320 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3321 hdr->itt = cmd->init_task_tag; 3322 cmd->stat_sn = conn->stat_sn++; 3323 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3324 3325 iscsit_increment_maxcmdsn(cmd, conn->sess); 3326 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3327 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3328 3329 pr_debug("Built Task Management Response ITT: 0x%08x," 3330 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3331 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3332 } 3333 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3334 3335 static int 3336 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3337 { 3338 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3339 u32 tx_size = 0; 3340 3341 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3342 3343 cmd->iov_misc[0].iov_base = cmd->pdu; 3344 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3345 tx_size += ISCSI_HDR_LEN; 3346 3347 if (conn->conn_ops->HeaderDigest) { 3348 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3349 3350 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3351 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3352 3353 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3354 tx_size += ISCSI_CRC_LEN; 3355 pr_debug("Attaching CRC32 HeaderDigest for Task" 3356 " Mgmt Response PDU 0x%08x\n", *header_digest); 3357 } 3358 3359 cmd->iov_misc_count = 1; 3360 cmd->tx_size = tx_size; 3361 3362 return 0; 3363 } 3364 3365 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3366 { 3367 bool ret = false; 3368 3369 if (np->np_sockaddr.ss_family == AF_INET6) { 3370 const struct sockaddr_in6 sin6 = { 3371 .sin6_addr = IN6ADDR_ANY_INIT }; 3372 struct sockaddr_in6 *sock_in6 = 3373 (struct sockaddr_in6 *)&np->np_sockaddr; 3374 3375 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3376 sin6.sin6_addr.s6_addr, 16)) 3377 ret = true; 3378 } else { 3379 struct sockaddr_in * sock_in = 3380 (struct sockaddr_in *)&np->np_sockaddr; 3381 3382 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3383 ret = true; 3384 } 3385 3386 return ret; 3387 } 3388 3389 #define SENDTARGETS_BUF_LIMIT 32768U 3390 3391 static int 3392 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3393 enum iscsit_transport_type network_transport, 3394 int skip_bytes, bool *completed) 3395 { 3396 char *payload = NULL; 3397 struct iscsi_conn *conn = cmd->conn; 3398 struct iscsi_portal_group *tpg; 3399 struct iscsi_tiqn *tiqn; 3400 struct iscsi_tpg_np *tpg_np; 3401 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3402 int target_name_printed; 3403 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3404 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3405 3406 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3407 SENDTARGETS_BUF_LIMIT); 3408 3409 payload = kzalloc(buffer_len, GFP_KERNEL); 3410 if (!payload) { 3411 pr_err("Unable to allocate memory for sendtargets" 3412 " response.\n"); 3413 return -ENOMEM; 3414 } 3415 /* 3416 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3417 * explicit case.. 3418 */ 3419 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3420 text_ptr = strchr(text_in, '='); 3421 if (!text_ptr) { 3422 pr_err("Unable to locate '=' string in text_in:" 3423 " %s\n", text_in); 3424 kfree(payload); 3425 return -EINVAL; 3426 } 3427 /* 3428 * Skip over '=' character.. 3429 */ 3430 text_ptr += 1; 3431 } 3432 3433 spin_lock(&tiqn_lock); 3434 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3435 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3436 strcmp(tiqn->tiqn, text_ptr)) { 3437 continue; 3438 } 3439 3440 target_name_printed = 0; 3441 3442 spin_lock(&tiqn->tiqn_tpg_lock); 3443 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3444 3445 /* If demo_mode_discovery=0 and generate_node_acls=0 3446 * (demo mode dislabed) do not return 3447 * TargetName+TargetAddress unless a NodeACL exists. 3448 */ 3449 3450 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3451 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3452 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg, 3453 cmd->conn->sess->sess_ops->InitiatorName))) { 3454 continue; 3455 } 3456 3457 spin_lock(&tpg->tpg_state_lock); 3458 if ((tpg->tpg_state == TPG_STATE_FREE) || 3459 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3460 spin_unlock(&tpg->tpg_state_lock); 3461 continue; 3462 } 3463 spin_unlock(&tpg->tpg_state_lock); 3464 3465 spin_lock(&tpg->tpg_np_lock); 3466 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3467 tpg_np_list) { 3468 struct iscsi_np *np = tpg_np->tpg_np; 3469 bool inaddr_any = iscsit_check_inaddr_any(np); 3470 char *fmt_str; 3471 3472 if (np->np_network_transport != network_transport) 3473 continue; 3474 3475 if (!target_name_printed) { 3476 len = sprintf(buf, "TargetName=%s", 3477 tiqn->tiqn); 3478 len += 1; 3479 3480 if ((len + payload_len) > buffer_len) { 3481 spin_unlock(&tpg->tpg_np_lock); 3482 spin_unlock(&tiqn->tiqn_tpg_lock); 3483 end_of_buf = 1; 3484 goto eob; 3485 } 3486 3487 if (skip_bytes && len <= skip_bytes) { 3488 skip_bytes -= len; 3489 } else { 3490 memcpy(payload + payload_len, buf, len); 3491 payload_len += len; 3492 target_name_printed = 1; 3493 if (len > skip_bytes) 3494 skip_bytes = 0; 3495 } 3496 } 3497 3498 if (np->np_sockaddr.ss_family == AF_INET6) 3499 fmt_str = "TargetAddress=[%s]:%hu,%hu"; 3500 else 3501 fmt_str = "TargetAddress=%s:%hu,%hu"; 3502 3503 len = sprintf(buf, fmt_str, 3504 inaddr_any ? conn->local_ip : np->np_ip, 3505 np->np_port, 3506 tpg->tpgt); 3507 len += 1; 3508 3509 if ((len + payload_len) > buffer_len) { 3510 spin_unlock(&tpg->tpg_np_lock); 3511 spin_unlock(&tiqn->tiqn_tpg_lock); 3512 end_of_buf = 1; 3513 goto eob; 3514 } 3515 3516 if (skip_bytes && len <= skip_bytes) { 3517 skip_bytes -= len; 3518 } else { 3519 memcpy(payload + payload_len, buf, len); 3520 payload_len += len; 3521 if (len > skip_bytes) 3522 skip_bytes = 0; 3523 } 3524 } 3525 spin_unlock(&tpg->tpg_np_lock); 3526 } 3527 spin_unlock(&tiqn->tiqn_tpg_lock); 3528 eob: 3529 if (end_of_buf) { 3530 *completed = false; 3531 break; 3532 } 3533 3534 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3535 break; 3536 } 3537 spin_unlock(&tiqn_lock); 3538 3539 cmd->buf_ptr = payload; 3540 3541 return payload_len; 3542 } 3543 3544 int 3545 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3546 struct iscsi_text_rsp *hdr, 3547 enum iscsit_transport_type network_transport) 3548 { 3549 int text_length, padding; 3550 bool completed = true; 3551 3552 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3553 cmd->read_data_done, 3554 &completed); 3555 if (text_length < 0) 3556 return text_length; 3557 3558 if (completed) { 3559 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3560 } else { 3561 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3562 cmd->read_data_done += text_length; 3563 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3564 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3565 } 3566 hdr->opcode = ISCSI_OP_TEXT_RSP; 3567 padding = ((-text_length) & 3); 3568 hton24(hdr->dlength, text_length); 3569 hdr->itt = cmd->init_task_tag; 3570 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3571 cmd->stat_sn = conn->stat_sn++; 3572 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3573 3574 iscsit_increment_maxcmdsn(cmd, conn->sess); 3575 /* 3576 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3577 * correctly increment MaxCmdSN for each response answering a 3578 * non immediate text request with a valid CmdSN. 3579 */ 3580 cmd->maxcmdsn_inc = 0; 3581 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3582 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3583 3584 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3585 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3586 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3587 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3588 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3589 3590 return text_length + padding; 3591 } 3592 EXPORT_SYMBOL(iscsit_build_text_rsp); 3593 3594 static int iscsit_send_text_rsp( 3595 struct iscsi_cmd *cmd, 3596 struct iscsi_conn *conn) 3597 { 3598 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3599 struct kvec *iov; 3600 u32 tx_size = 0; 3601 int text_length, iov_count = 0, rc; 3602 3603 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP); 3604 if (rc < 0) 3605 return rc; 3606 3607 text_length = rc; 3608 iov = &cmd->iov_misc[0]; 3609 iov[iov_count].iov_base = cmd->pdu; 3610 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3611 iov[iov_count].iov_base = cmd->buf_ptr; 3612 iov[iov_count++].iov_len = text_length; 3613 3614 tx_size += (ISCSI_HDR_LEN + text_length); 3615 3616 if (conn->conn_ops->HeaderDigest) { 3617 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3618 3619 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3620 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3621 3622 iov[0].iov_len += ISCSI_CRC_LEN; 3623 tx_size += ISCSI_CRC_LEN; 3624 pr_debug("Attaching CRC32 HeaderDigest for" 3625 " Text Response PDU 0x%08x\n", *header_digest); 3626 } 3627 3628 if (conn->conn_ops->DataDigest) { 3629 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3630 cmd->buf_ptr, text_length, 3631 0, NULL, (u8 *)&cmd->data_crc); 3632 3633 iov[iov_count].iov_base = &cmd->data_crc; 3634 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3635 tx_size += ISCSI_CRC_LEN; 3636 3637 pr_debug("Attaching DataDigest for %u bytes of text" 3638 " data, CRC 0x%08x\n", text_length, 3639 cmd->data_crc); 3640 } 3641 3642 cmd->iov_misc_count = iov_count; 3643 cmd->tx_size = tx_size; 3644 3645 return 0; 3646 } 3647 3648 void 3649 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3650 struct iscsi_reject *hdr) 3651 { 3652 hdr->opcode = ISCSI_OP_REJECT; 3653 hdr->reason = cmd->reject_reason; 3654 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3655 hton24(hdr->dlength, ISCSI_HDR_LEN); 3656 hdr->ffffffff = cpu_to_be32(0xffffffff); 3657 cmd->stat_sn = conn->stat_sn++; 3658 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3659 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3660 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3661 3662 } 3663 EXPORT_SYMBOL(iscsit_build_reject); 3664 3665 static int iscsit_send_reject( 3666 struct iscsi_cmd *cmd, 3667 struct iscsi_conn *conn) 3668 { 3669 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3670 struct kvec *iov; 3671 u32 iov_count = 0, tx_size; 3672 3673 iscsit_build_reject(cmd, conn, hdr); 3674 3675 iov = &cmd->iov_misc[0]; 3676 iov[iov_count].iov_base = cmd->pdu; 3677 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3678 iov[iov_count].iov_base = cmd->buf_ptr; 3679 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3680 3681 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3682 3683 if (conn->conn_ops->HeaderDigest) { 3684 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3685 3686 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3687 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3688 3689 iov[0].iov_len += ISCSI_CRC_LEN; 3690 tx_size += ISCSI_CRC_LEN; 3691 pr_debug("Attaching CRC32 HeaderDigest for" 3692 " REJECT PDU 0x%08x\n", *header_digest); 3693 } 3694 3695 if (conn->conn_ops->DataDigest) { 3696 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3697 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3698 3699 iov[iov_count].iov_base = &cmd->data_crc; 3700 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3701 tx_size += ISCSI_CRC_LEN; 3702 pr_debug("Attaching CRC32 DataDigest for REJECT" 3703 " PDU 0x%08x\n", cmd->data_crc); 3704 } 3705 3706 cmd->iov_misc_count = iov_count; 3707 cmd->tx_size = tx_size; 3708 3709 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3710 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3711 3712 return 0; 3713 } 3714 3715 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3716 { 3717 int ord, cpu; 3718 /* 3719 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3720 * within iscsit_start_kthreads() 3721 * 3722 * Here we use bitmap_id to determine which CPU that this 3723 * iSCSI connection's RX/TX threads will be scheduled to 3724 * execute upon. 3725 */ 3726 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3727 for_each_online_cpu(cpu) { 3728 if (ord-- == 0) { 3729 cpumask_set_cpu(cpu, conn->conn_cpumask); 3730 return; 3731 } 3732 } 3733 /* 3734 * This should never be reached.. 3735 */ 3736 dump_stack(); 3737 cpumask_setall(conn->conn_cpumask); 3738 } 3739 3740 static inline void iscsit_thread_check_cpumask( 3741 struct iscsi_conn *conn, 3742 struct task_struct *p, 3743 int mode) 3744 { 3745 /* 3746 * mode == 1 signals iscsi_target_tx_thread() usage. 3747 * mode == 0 signals iscsi_target_rx_thread() usage. 3748 */ 3749 if (mode == 1) { 3750 if (!conn->conn_tx_reset_cpumask) 3751 return; 3752 conn->conn_tx_reset_cpumask = 0; 3753 } else { 3754 if (!conn->conn_rx_reset_cpumask) 3755 return; 3756 conn->conn_rx_reset_cpumask = 0; 3757 } 3758 /* 3759 * Update the CPU mask for this single kthread so that 3760 * both TX and RX kthreads are scheduled to run on the 3761 * same CPU. 3762 */ 3763 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3764 } 3765 3766 static int 3767 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3768 { 3769 int ret; 3770 3771 switch (state) { 3772 case ISTATE_SEND_R2T: 3773 ret = iscsit_send_r2t(cmd, conn); 3774 if (ret < 0) 3775 goto err; 3776 break; 3777 case ISTATE_REMOVE: 3778 spin_lock_bh(&conn->cmd_lock); 3779 list_del_init(&cmd->i_conn_node); 3780 spin_unlock_bh(&conn->cmd_lock); 3781 3782 iscsit_free_cmd(cmd, false); 3783 break; 3784 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3785 iscsit_mod_nopin_response_timer(conn); 3786 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3787 if (ret < 0) 3788 goto err; 3789 break; 3790 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3791 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3792 if (ret < 0) 3793 goto err; 3794 break; 3795 default: 3796 pr_err("Unknown Opcode: 0x%02x ITT:" 3797 " 0x%08x, i_state: %d on CID: %hu\n", 3798 cmd->iscsi_opcode, cmd->init_task_tag, state, 3799 conn->cid); 3800 goto err; 3801 } 3802 3803 return 0; 3804 3805 err: 3806 return -1; 3807 } 3808 3809 static int 3810 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3811 { 3812 struct iscsit_transport *t = conn->conn_transport; 3813 struct iscsi_queue_req *qr; 3814 struct iscsi_cmd *cmd; 3815 u8 state; 3816 int ret; 3817 3818 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3819 atomic_set(&conn->check_immediate_queue, 0); 3820 cmd = qr->cmd; 3821 state = qr->state; 3822 kmem_cache_free(lio_qr_cache, qr); 3823 3824 ret = t->iscsit_immediate_queue(conn, cmd, state); 3825 if (ret < 0) 3826 return ret; 3827 } 3828 3829 return 0; 3830 } 3831 3832 static int 3833 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3834 { 3835 int ret; 3836 3837 check_rsp_state: 3838 switch (state) { 3839 case ISTATE_SEND_DATAIN: 3840 ret = iscsit_send_datain(cmd, conn); 3841 if (ret < 0) 3842 goto err; 3843 else if (!ret) 3844 /* more drs */ 3845 goto check_rsp_state; 3846 else if (ret == 1) { 3847 /* all done */ 3848 spin_lock_bh(&cmd->istate_lock); 3849 cmd->i_state = ISTATE_SENT_STATUS; 3850 spin_unlock_bh(&cmd->istate_lock); 3851 3852 if (atomic_read(&conn->check_immediate_queue)) 3853 return 1; 3854 3855 return 0; 3856 } else if (ret == 2) { 3857 /* Still must send status, 3858 SCF_TRANSPORT_TASK_SENSE was set */ 3859 spin_lock_bh(&cmd->istate_lock); 3860 cmd->i_state = ISTATE_SEND_STATUS; 3861 spin_unlock_bh(&cmd->istate_lock); 3862 state = ISTATE_SEND_STATUS; 3863 goto check_rsp_state; 3864 } 3865 3866 break; 3867 case ISTATE_SEND_STATUS: 3868 case ISTATE_SEND_STATUS_RECOVERY: 3869 ret = iscsit_send_response(cmd, conn); 3870 break; 3871 case ISTATE_SEND_LOGOUTRSP: 3872 ret = iscsit_send_logout(cmd, conn); 3873 break; 3874 case ISTATE_SEND_ASYNCMSG: 3875 ret = iscsit_send_conn_drop_async_message( 3876 cmd, conn); 3877 break; 3878 case ISTATE_SEND_NOPIN: 3879 ret = iscsit_send_nopin(cmd, conn); 3880 break; 3881 case ISTATE_SEND_REJECT: 3882 ret = iscsit_send_reject(cmd, conn); 3883 break; 3884 case ISTATE_SEND_TASKMGTRSP: 3885 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3886 if (ret != 0) 3887 break; 3888 ret = iscsit_tmr_post_handler(cmd, conn); 3889 if (ret != 0) 3890 iscsit_fall_back_to_erl0(conn->sess); 3891 break; 3892 case ISTATE_SEND_TEXTRSP: 3893 ret = iscsit_send_text_rsp(cmd, conn); 3894 break; 3895 default: 3896 pr_err("Unknown Opcode: 0x%02x ITT:" 3897 " 0x%08x, i_state: %d on CID: %hu\n", 3898 cmd->iscsi_opcode, cmd->init_task_tag, 3899 state, conn->cid); 3900 goto err; 3901 } 3902 if (ret < 0) 3903 goto err; 3904 3905 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3906 iscsit_tx_thread_wait_for_tcp(conn); 3907 iscsit_unmap_iovec(cmd); 3908 goto err; 3909 } 3910 iscsit_unmap_iovec(cmd); 3911 3912 switch (state) { 3913 case ISTATE_SEND_LOGOUTRSP: 3914 if (!iscsit_logout_post_handler(cmd, conn)) 3915 return -ECONNRESET; 3916 /* fall through */ 3917 case ISTATE_SEND_STATUS: 3918 case ISTATE_SEND_ASYNCMSG: 3919 case ISTATE_SEND_NOPIN: 3920 case ISTATE_SEND_STATUS_RECOVERY: 3921 case ISTATE_SEND_TEXTRSP: 3922 case ISTATE_SEND_TASKMGTRSP: 3923 case ISTATE_SEND_REJECT: 3924 spin_lock_bh(&cmd->istate_lock); 3925 cmd->i_state = ISTATE_SENT_STATUS; 3926 spin_unlock_bh(&cmd->istate_lock); 3927 break; 3928 default: 3929 pr_err("Unknown Opcode: 0x%02x ITT:" 3930 " 0x%08x, i_state: %d on CID: %hu\n", 3931 cmd->iscsi_opcode, cmd->init_task_tag, 3932 cmd->i_state, conn->cid); 3933 goto err; 3934 } 3935 3936 if (atomic_read(&conn->check_immediate_queue)) 3937 return 1; 3938 3939 return 0; 3940 3941 err: 3942 return -1; 3943 } 3944 3945 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3946 { 3947 struct iscsit_transport *t = conn->conn_transport; 3948 struct iscsi_queue_req *qr; 3949 struct iscsi_cmd *cmd; 3950 u8 state; 3951 int ret; 3952 3953 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3954 cmd = qr->cmd; 3955 state = qr->state; 3956 kmem_cache_free(lio_qr_cache, qr); 3957 3958 ret = t->iscsit_response_queue(conn, cmd, state); 3959 if (ret == 1 || ret < 0) 3960 return ret; 3961 } 3962 3963 return 0; 3964 } 3965 3966 int iscsi_target_tx_thread(void *arg) 3967 { 3968 int ret = 0; 3969 struct iscsi_conn *conn = arg; 3970 /* 3971 * Allow ourselves to be interrupted by SIGINT so that a 3972 * connection recovery / failure event can be triggered externally. 3973 */ 3974 allow_signal(SIGINT); 3975 3976 while (!kthread_should_stop()) { 3977 /* 3978 * Ensure that both TX and RX per connection kthreads 3979 * are scheduled to run on the same CPU. 3980 */ 3981 iscsit_thread_check_cpumask(conn, current, 1); 3982 3983 wait_event_interruptible(conn->queues_wq, 3984 !iscsit_conn_all_queues_empty(conn)); 3985 3986 if (signal_pending(current)) 3987 goto transport_err; 3988 3989 get_immediate: 3990 ret = iscsit_handle_immediate_queue(conn); 3991 if (ret < 0) 3992 goto transport_err; 3993 3994 ret = iscsit_handle_response_queue(conn); 3995 if (ret == 1) 3996 goto get_immediate; 3997 else if (ret == -ECONNRESET) 3998 goto out; 3999 else if (ret < 0) 4000 goto transport_err; 4001 } 4002 4003 transport_err: 4004 iscsit_take_action_for_connection_exit(conn); 4005 out: 4006 return 0; 4007 } 4008 4009 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 4010 { 4011 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 4012 struct iscsi_cmd *cmd; 4013 int ret = 0; 4014 4015 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 4016 case ISCSI_OP_SCSI_CMD: 4017 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4018 if (!cmd) 4019 goto reject; 4020 4021 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 4022 break; 4023 case ISCSI_OP_SCSI_DATA_OUT: 4024 ret = iscsit_handle_data_out(conn, buf); 4025 break; 4026 case ISCSI_OP_NOOP_OUT: 4027 cmd = NULL; 4028 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 4029 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4030 if (!cmd) 4031 goto reject; 4032 } 4033 ret = iscsit_handle_nop_out(conn, cmd, buf); 4034 break; 4035 case ISCSI_OP_SCSI_TMFUNC: 4036 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4037 if (!cmd) 4038 goto reject; 4039 4040 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 4041 break; 4042 case ISCSI_OP_TEXT: 4043 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 4044 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 4045 if (!cmd) 4046 goto reject; 4047 } else { 4048 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4049 if (!cmd) 4050 goto reject; 4051 } 4052 4053 ret = iscsit_handle_text_cmd(conn, cmd, buf); 4054 break; 4055 case ISCSI_OP_LOGOUT: 4056 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4057 if (!cmd) 4058 goto reject; 4059 4060 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4061 if (ret > 0) 4062 wait_for_completion_timeout(&conn->conn_logout_comp, 4063 SECONDS_FOR_LOGOUT_COMP * HZ); 4064 break; 4065 case ISCSI_OP_SNACK: 4066 ret = iscsit_handle_snack(conn, buf); 4067 break; 4068 default: 4069 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4070 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4071 pr_err("Cannot recover from unknown" 4072 " opcode while ERL=0, closing iSCSI connection.\n"); 4073 return -1; 4074 } 4075 if (!conn->conn_ops->OFMarker) { 4076 pr_err("Unable to recover from unknown" 4077 " opcode while OFMarker=No, closing iSCSI" 4078 " connection.\n"); 4079 return -1; 4080 } 4081 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 4082 pr_err("Unable to recover from unknown" 4083 " opcode, closing iSCSI connection.\n"); 4084 return -1; 4085 } 4086 break; 4087 } 4088 4089 return ret; 4090 reject: 4091 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4092 } 4093 4094 int iscsi_target_rx_thread(void *arg) 4095 { 4096 int ret; 4097 u8 buffer[ISCSI_HDR_LEN], opcode; 4098 u32 checksum = 0, digest = 0; 4099 struct iscsi_conn *conn = arg; 4100 struct kvec iov; 4101 /* 4102 * Allow ourselves to be interrupted by SIGINT so that a 4103 * connection recovery / failure event can be triggered externally. 4104 */ 4105 allow_signal(SIGINT); 4106 4107 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4108 struct completion comp; 4109 int rc; 4110 4111 init_completion(&comp); 4112 rc = wait_for_completion_interruptible(&comp); 4113 if (rc < 0) 4114 goto transport_err; 4115 4116 goto transport_err; 4117 } 4118 4119 while (!kthread_should_stop()) { 4120 /* 4121 * Ensure that both TX and RX per connection kthreads 4122 * are scheduled to run on the same CPU. 4123 */ 4124 iscsit_thread_check_cpumask(conn, current, 0); 4125 4126 memset(buffer, 0, ISCSI_HDR_LEN); 4127 memset(&iov, 0, sizeof(struct kvec)); 4128 4129 iov.iov_base = buffer; 4130 iov.iov_len = ISCSI_HDR_LEN; 4131 4132 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4133 if (ret != ISCSI_HDR_LEN) { 4134 iscsit_rx_thread_wait_for_tcp(conn); 4135 goto transport_err; 4136 } 4137 4138 if (conn->conn_ops->HeaderDigest) { 4139 iov.iov_base = &digest; 4140 iov.iov_len = ISCSI_CRC_LEN; 4141 4142 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4143 if (ret != ISCSI_CRC_LEN) { 4144 iscsit_rx_thread_wait_for_tcp(conn); 4145 goto transport_err; 4146 } 4147 4148 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4149 buffer, ISCSI_HDR_LEN, 4150 0, NULL, (u8 *)&checksum); 4151 4152 if (digest != checksum) { 4153 pr_err("HeaderDigest CRC32C failed," 4154 " received 0x%08x, computed 0x%08x\n", 4155 digest, checksum); 4156 /* 4157 * Set the PDU to 0xff so it will intentionally 4158 * hit default in the switch below. 4159 */ 4160 memset(buffer, 0xff, ISCSI_HDR_LEN); 4161 atomic_long_inc(&conn->sess->conn_digest_errors); 4162 } else { 4163 pr_debug("Got HeaderDigest CRC32C" 4164 " 0x%08x\n", checksum); 4165 } 4166 } 4167 4168 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4169 goto transport_err; 4170 4171 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4172 4173 if (conn->sess->sess_ops->SessionType && 4174 ((!(opcode & ISCSI_OP_TEXT)) || 4175 (!(opcode & ISCSI_OP_LOGOUT)))) { 4176 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4177 " while in Discovery Session, rejecting.\n", opcode); 4178 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4179 buffer); 4180 goto transport_err; 4181 } 4182 4183 ret = iscsi_target_rx_opcode(conn, buffer); 4184 if (ret < 0) 4185 goto transport_err; 4186 } 4187 4188 transport_err: 4189 if (!signal_pending(current)) 4190 atomic_set(&conn->transport_failed, 1); 4191 iscsit_take_action_for_connection_exit(conn); 4192 return 0; 4193 } 4194 4195 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4196 { 4197 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4198 struct iscsi_session *sess = conn->sess; 4199 /* 4200 * We expect this function to only ever be called from either RX or TX 4201 * thread context via iscsit_close_connection() once the other context 4202 * has been reset -> returned sleeping pre-handler state. 4203 */ 4204 spin_lock_bh(&conn->cmd_lock); 4205 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4206 4207 list_del_init(&cmd->i_conn_node); 4208 spin_unlock_bh(&conn->cmd_lock); 4209 4210 iscsit_increment_maxcmdsn(cmd, sess); 4211 4212 iscsit_free_cmd(cmd, true); 4213 4214 spin_lock_bh(&conn->cmd_lock); 4215 } 4216 spin_unlock_bh(&conn->cmd_lock); 4217 } 4218 4219 static void iscsit_stop_timers_for_cmds( 4220 struct iscsi_conn *conn) 4221 { 4222 struct iscsi_cmd *cmd; 4223 4224 spin_lock_bh(&conn->cmd_lock); 4225 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4226 if (cmd->data_direction == DMA_TO_DEVICE) 4227 iscsit_stop_dataout_timer(cmd); 4228 } 4229 spin_unlock_bh(&conn->cmd_lock); 4230 } 4231 4232 int iscsit_close_connection( 4233 struct iscsi_conn *conn) 4234 { 4235 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4236 struct iscsi_session *sess = conn->sess; 4237 4238 pr_debug("Closing iSCSI connection CID %hu on SID:" 4239 " %u\n", conn->cid, sess->sid); 4240 /* 4241 * Always up conn_logout_comp for the traditional TCP case just in case 4242 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout 4243 * response never got sent because the connection failed. 4244 * 4245 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4246 * to signal logout response TX interrupt completion. Go ahead and skip 4247 * this for iser since isert_rx_opcode() does not wait on logout failure, 4248 * and to avoid iscsi_conn pointer dereference in iser-target code. 4249 */ 4250 if (conn->conn_transport->transport_type == ISCSI_TCP) 4251 complete(&conn->conn_logout_comp); 4252 4253 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4254 if (conn->tx_thread && 4255 cmpxchg(&conn->tx_thread_active, true, false)) { 4256 send_sig(SIGINT, conn->tx_thread, 1); 4257 kthread_stop(conn->tx_thread); 4258 } 4259 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4260 if (conn->rx_thread && 4261 cmpxchg(&conn->rx_thread_active, true, false)) { 4262 send_sig(SIGINT, conn->rx_thread, 1); 4263 kthread_stop(conn->rx_thread); 4264 } 4265 } 4266 4267 spin_lock(&iscsit_global->ts_bitmap_lock); 4268 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4269 get_order(1)); 4270 spin_unlock(&iscsit_global->ts_bitmap_lock); 4271 4272 iscsit_stop_timers_for_cmds(conn); 4273 iscsit_stop_nopin_response_timer(conn); 4274 iscsit_stop_nopin_timer(conn); 4275 4276 if (conn->conn_transport->iscsit_wait_conn) 4277 conn->conn_transport->iscsit_wait_conn(conn); 4278 4279 /* 4280 * During Connection recovery drop unacknowledged out of order 4281 * commands for this connection, and prepare the other commands 4282 * for realligence. 4283 * 4284 * During normal operation clear the out of order commands (but 4285 * do not free the struct iscsi_ooo_cmdsn's) and release all 4286 * struct iscsi_cmds. 4287 */ 4288 if (atomic_read(&conn->connection_recovery)) { 4289 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4290 iscsit_prepare_cmds_for_realligance(conn); 4291 } else { 4292 iscsit_clear_ooo_cmdsns_for_conn(conn); 4293 iscsit_release_commands_from_conn(conn); 4294 } 4295 iscsit_free_queue_reqs_for_conn(conn); 4296 4297 /* 4298 * Handle decrementing session or connection usage count if 4299 * a logout response was not able to be sent because the 4300 * connection failed. Fall back to Session Recovery here. 4301 */ 4302 if (atomic_read(&conn->conn_logout_remove)) { 4303 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4304 iscsit_dec_conn_usage_count(conn); 4305 iscsit_dec_session_usage_count(sess); 4306 } 4307 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4308 iscsit_dec_conn_usage_count(conn); 4309 4310 atomic_set(&conn->conn_logout_remove, 0); 4311 atomic_set(&sess->session_reinstatement, 0); 4312 atomic_set(&sess->session_fall_back_to_erl0, 1); 4313 } 4314 4315 spin_lock_bh(&sess->conn_lock); 4316 list_del(&conn->conn_list); 4317 4318 /* 4319 * Attempt to let the Initiator know this connection failed by 4320 * sending an Connection Dropped Async Message on another 4321 * active connection. 4322 */ 4323 if (atomic_read(&conn->connection_recovery)) 4324 iscsit_build_conn_drop_async_message(conn); 4325 4326 spin_unlock_bh(&sess->conn_lock); 4327 4328 /* 4329 * If connection reinstatement is being performed on this connection, 4330 * up the connection reinstatement semaphore that is being blocked on 4331 * in iscsit_cause_connection_reinstatement(). 4332 */ 4333 spin_lock_bh(&conn->state_lock); 4334 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4335 spin_unlock_bh(&conn->state_lock); 4336 complete(&conn->conn_wait_comp); 4337 wait_for_completion(&conn->conn_post_wait_comp); 4338 spin_lock_bh(&conn->state_lock); 4339 } 4340 4341 /* 4342 * If connection reinstatement is being performed on this connection 4343 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4344 * connection wait rcfr semaphore that is being blocked on 4345 * an iscsit_connection_reinstatement_rcfr(). 4346 */ 4347 if (atomic_read(&conn->connection_wait_rcfr)) { 4348 spin_unlock_bh(&conn->state_lock); 4349 complete(&conn->conn_wait_rcfr_comp); 4350 wait_for_completion(&conn->conn_post_wait_comp); 4351 spin_lock_bh(&conn->state_lock); 4352 } 4353 atomic_set(&conn->connection_reinstatement, 1); 4354 spin_unlock_bh(&conn->state_lock); 4355 4356 /* 4357 * If any other processes are accessing this connection pointer we 4358 * must wait until they have completed. 4359 */ 4360 iscsit_check_conn_usage_count(conn); 4361 4362 if (conn->conn_rx_hash.tfm) 4363 crypto_free_hash(conn->conn_rx_hash.tfm); 4364 if (conn->conn_tx_hash.tfm) 4365 crypto_free_hash(conn->conn_tx_hash.tfm); 4366 4367 free_cpumask_var(conn->conn_cpumask); 4368 4369 kfree(conn->conn_ops); 4370 conn->conn_ops = NULL; 4371 4372 if (conn->sock) 4373 sock_release(conn->sock); 4374 4375 if (conn->conn_transport->iscsit_free_conn) 4376 conn->conn_transport->iscsit_free_conn(conn); 4377 4378 iscsit_put_transport(conn->conn_transport); 4379 4380 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4381 conn->conn_state = TARG_CONN_STATE_FREE; 4382 kfree(conn); 4383 4384 spin_lock_bh(&sess->conn_lock); 4385 atomic_dec(&sess->nconn); 4386 pr_debug("Decremented iSCSI connection count to %hu from node:" 4387 " %s\n", atomic_read(&sess->nconn), 4388 sess->sess_ops->InitiatorName); 4389 /* 4390 * Make sure that if one connection fails in an non ERL=2 iSCSI 4391 * Session that they all fail. 4392 */ 4393 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4394 !atomic_read(&sess->session_logout)) 4395 atomic_set(&sess->session_fall_back_to_erl0, 1); 4396 4397 /* 4398 * If this was not the last connection in the session, and we are 4399 * performing session reinstatement or falling back to ERL=0, call 4400 * iscsit_stop_session() without sleeping to shutdown the other 4401 * active connections. 4402 */ 4403 if (atomic_read(&sess->nconn)) { 4404 if (!atomic_read(&sess->session_reinstatement) && 4405 !atomic_read(&sess->session_fall_back_to_erl0)) { 4406 spin_unlock_bh(&sess->conn_lock); 4407 return 0; 4408 } 4409 if (!atomic_read(&sess->session_stop_active)) { 4410 atomic_set(&sess->session_stop_active, 1); 4411 spin_unlock_bh(&sess->conn_lock); 4412 iscsit_stop_session(sess, 0, 0); 4413 return 0; 4414 } 4415 spin_unlock_bh(&sess->conn_lock); 4416 return 0; 4417 } 4418 4419 /* 4420 * If this was the last connection in the session and one of the 4421 * following is occurring: 4422 * 4423 * Session Reinstatement is not being performed, and are falling back 4424 * to ERL=0 call iscsit_close_session(). 4425 * 4426 * Session Logout was requested. iscsit_close_session() will be called 4427 * elsewhere. 4428 * 4429 * Session Continuation is not being performed, start the Time2Retain 4430 * handler and check if sleep_on_sess_wait_sem is active. 4431 */ 4432 if (!atomic_read(&sess->session_reinstatement) && 4433 atomic_read(&sess->session_fall_back_to_erl0)) { 4434 spin_unlock_bh(&sess->conn_lock); 4435 target_put_session(sess->se_sess); 4436 4437 return 0; 4438 } else if (atomic_read(&sess->session_logout)) { 4439 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4440 sess->session_state = TARG_SESS_STATE_FREE; 4441 spin_unlock_bh(&sess->conn_lock); 4442 4443 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4444 complete(&sess->session_wait_comp); 4445 4446 return 0; 4447 } else { 4448 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4449 sess->session_state = TARG_SESS_STATE_FAILED; 4450 4451 if (!atomic_read(&sess->session_continuation)) { 4452 spin_unlock_bh(&sess->conn_lock); 4453 iscsit_start_time2retain_handler(sess); 4454 } else 4455 spin_unlock_bh(&sess->conn_lock); 4456 4457 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4458 complete(&sess->session_wait_comp); 4459 4460 return 0; 4461 } 4462 spin_unlock_bh(&sess->conn_lock); 4463 4464 return 0; 4465 } 4466 4467 int iscsit_close_session(struct iscsi_session *sess) 4468 { 4469 struct iscsi_portal_group *tpg = sess->tpg; 4470 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4471 4472 if (atomic_read(&sess->nconn)) { 4473 pr_err("%d connection(s) still exist for iSCSI session" 4474 " to %s\n", atomic_read(&sess->nconn), 4475 sess->sess_ops->InitiatorName); 4476 BUG(); 4477 } 4478 4479 spin_lock_bh(&se_tpg->session_lock); 4480 atomic_set(&sess->session_logout, 1); 4481 atomic_set(&sess->session_reinstatement, 1); 4482 iscsit_stop_time2retain_timer(sess); 4483 spin_unlock_bh(&se_tpg->session_lock); 4484 4485 /* 4486 * transport_deregister_session_configfs() will clear the 4487 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4488 * can be setting it again with __transport_register_session() in 4489 * iscsi_post_login_handler() again after the iscsit_stop_session() 4490 * completes in iscsi_np context. 4491 */ 4492 transport_deregister_session_configfs(sess->se_sess); 4493 4494 /* 4495 * If any other processes are accessing this session pointer we must 4496 * wait until they have completed. If we are in an interrupt (the 4497 * time2retain handler) and contain and active session usage count we 4498 * restart the timer and exit. 4499 */ 4500 if (!in_interrupt()) { 4501 if (iscsit_check_session_usage_count(sess) == 1) 4502 iscsit_stop_session(sess, 1, 1); 4503 } else { 4504 if (iscsit_check_session_usage_count(sess) == 2) { 4505 atomic_set(&sess->session_logout, 0); 4506 iscsit_start_time2retain_handler(sess); 4507 return 0; 4508 } 4509 } 4510 4511 transport_deregister_session(sess->se_sess); 4512 4513 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4514 iscsit_free_connection_recovery_entires(sess); 4515 4516 iscsit_free_all_ooo_cmdsns(sess); 4517 4518 spin_lock_bh(&se_tpg->session_lock); 4519 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4520 sess->session_state = TARG_SESS_STATE_FREE; 4521 pr_debug("Released iSCSI session from node: %s\n", 4522 sess->sess_ops->InitiatorName); 4523 tpg->nsessions--; 4524 if (tpg->tpg_tiqn) 4525 tpg->tpg_tiqn->tiqn_nsessions--; 4526 4527 pr_debug("Decremented number of active iSCSI Sessions on" 4528 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4529 4530 spin_lock(&sess_idr_lock); 4531 idr_remove(&sess_idr, sess->session_index); 4532 spin_unlock(&sess_idr_lock); 4533 4534 kfree(sess->sess_ops); 4535 sess->sess_ops = NULL; 4536 spin_unlock_bh(&se_tpg->session_lock); 4537 4538 kfree(sess); 4539 return 0; 4540 } 4541 4542 static void iscsit_logout_post_handler_closesession( 4543 struct iscsi_conn *conn) 4544 { 4545 struct iscsi_session *sess = conn->sess; 4546 int sleep = cmpxchg(&conn->tx_thread_active, true, false); 4547 4548 atomic_set(&conn->conn_logout_remove, 0); 4549 complete(&conn->conn_logout_comp); 4550 4551 iscsit_dec_conn_usage_count(conn); 4552 iscsit_stop_session(sess, sleep, sleep); 4553 iscsit_dec_session_usage_count(sess); 4554 target_put_session(sess->se_sess); 4555 } 4556 4557 static void iscsit_logout_post_handler_samecid( 4558 struct iscsi_conn *conn) 4559 { 4560 int sleep = cmpxchg(&conn->tx_thread_active, true, false); 4561 4562 atomic_set(&conn->conn_logout_remove, 0); 4563 complete(&conn->conn_logout_comp); 4564 4565 iscsit_cause_connection_reinstatement(conn, sleep); 4566 iscsit_dec_conn_usage_count(conn); 4567 } 4568 4569 static void iscsit_logout_post_handler_diffcid( 4570 struct iscsi_conn *conn, 4571 u16 cid) 4572 { 4573 struct iscsi_conn *l_conn; 4574 struct iscsi_session *sess = conn->sess; 4575 bool conn_found = false; 4576 4577 if (!sess) 4578 return; 4579 4580 spin_lock_bh(&sess->conn_lock); 4581 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4582 if (l_conn->cid == cid) { 4583 iscsit_inc_conn_usage_count(l_conn); 4584 conn_found = true; 4585 break; 4586 } 4587 } 4588 spin_unlock_bh(&sess->conn_lock); 4589 4590 if (!conn_found) 4591 return; 4592 4593 if (l_conn->sock) 4594 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4595 4596 spin_lock_bh(&l_conn->state_lock); 4597 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4598 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4599 spin_unlock_bh(&l_conn->state_lock); 4600 4601 iscsit_cause_connection_reinstatement(l_conn, 1); 4602 iscsit_dec_conn_usage_count(l_conn); 4603 } 4604 4605 /* 4606 * Return of 0 causes the TX thread to restart. 4607 */ 4608 int iscsit_logout_post_handler( 4609 struct iscsi_cmd *cmd, 4610 struct iscsi_conn *conn) 4611 { 4612 int ret = 0; 4613 4614 switch (cmd->logout_reason) { 4615 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4616 switch (cmd->logout_response) { 4617 case ISCSI_LOGOUT_SUCCESS: 4618 case ISCSI_LOGOUT_CLEANUP_FAILED: 4619 default: 4620 iscsit_logout_post_handler_closesession(conn); 4621 break; 4622 } 4623 ret = 0; 4624 break; 4625 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4626 if (conn->cid == cmd->logout_cid) { 4627 switch (cmd->logout_response) { 4628 case ISCSI_LOGOUT_SUCCESS: 4629 case ISCSI_LOGOUT_CLEANUP_FAILED: 4630 default: 4631 iscsit_logout_post_handler_samecid(conn); 4632 break; 4633 } 4634 ret = 0; 4635 } else { 4636 switch (cmd->logout_response) { 4637 case ISCSI_LOGOUT_SUCCESS: 4638 iscsit_logout_post_handler_diffcid(conn, 4639 cmd->logout_cid); 4640 break; 4641 case ISCSI_LOGOUT_CID_NOT_FOUND: 4642 case ISCSI_LOGOUT_CLEANUP_FAILED: 4643 default: 4644 break; 4645 } 4646 ret = 1; 4647 } 4648 break; 4649 case ISCSI_LOGOUT_REASON_RECOVERY: 4650 switch (cmd->logout_response) { 4651 case ISCSI_LOGOUT_SUCCESS: 4652 case ISCSI_LOGOUT_CID_NOT_FOUND: 4653 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4654 case ISCSI_LOGOUT_CLEANUP_FAILED: 4655 default: 4656 break; 4657 } 4658 ret = 1; 4659 break; 4660 default: 4661 break; 4662 4663 } 4664 return ret; 4665 } 4666 EXPORT_SYMBOL(iscsit_logout_post_handler); 4667 4668 void iscsit_fail_session(struct iscsi_session *sess) 4669 { 4670 struct iscsi_conn *conn; 4671 4672 spin_lock_bh(&sess->conn_lock); 4673 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4674 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4675 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4676 } 4677 spin_unlock_bh(&sess->conn_lock); 4678 4679 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4680 sess->session_state = TARG_SESS_STATE_FAILED; 4681 } 4682 4683 int iscsit_free_session(struct iscsi_session *sess) 4684 { 4685 u16 conn_count = atomic_read(&sess->nconn); 4686 struct iscsi_conn *conn, *conn_tmp = NULL; 4687 int is_last; 4688 4689 spin_lock_bh(&sess->conn_lock); 4690 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4691 4692 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4693 conn_list) { 4694 if (conn_count == 0) 4695 break; 4696 4697 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4698 is_last = 1; 4699 } else { 4700 iscsit_inc_conn_usage_count(conn_tmp); 4701 is_last = 0; 4702 } 4703 iscsit_inc_conn_usage_count(conn); 4704 4705 spin_unlock_bh(&sess->conn_lock); 4706 iscsit_cause_connection_reinstatement(conn, 1); 4707 spin_lock_bh(&sess->conn_lock); 4708 4709 iscsit_dec_conn_usage_count(conn); 4710 if (is_last == 0) 4711 iscsit_dec_conn_usage_count(conn_tmp); 4712 4713 conn_count--; 4714 } 4715 4716 if (atomic_read(&sess->nconn)) { 4717 spin_unlock_bh(&sess->conn_lock); 4718 wait_for_completion(&sess->session_wait_comp); 4719 } else 4720 spin_unlock_bh(&sess->conn_lock); 4721 4722 target_put_session(sess->se_sess); 4723 return 0; 4724 } 4725 4726 void iscsit_stop_session( 4727 struct iscsi_session *sess, 4728 int session_sleep, 4729 int connection_sleep) 4730 { 4731 u16 conn_count = atomic_read(&sess->nconn); 4732 struct iscsi_conn *conn, *conn_tmp = NULL; 4733 int is_last; 4734 4735 spin_lock_bh(&sess->conn_lock); 4736 if (session_sleep) 4737 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4738 4739 if (connection_sleep) { 4740 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4741 conn_list) { 4742 if (conn_count == 0) 4743 break; 4744 4745 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4746 is_last = 1; 4747 } else { 4748 iscsit_inc_conn_usage_count(conn_tmp); 4749 is_last = 0; 4750 } 4751 iscsit_inc_conn_usage_count(conn); 4752 4753 spin_unlock_bh(&sess->conn_lock); 4754 iscsit_cause_connection_reinstatement(conn, 1); 4755 spin_lock_bh(&sess->conn_lock); 4756 4757 iscsit_dec_conn_usage_count(conn); 4758 if (is_last == 0) 4759 iscsit_dec_conn_usage_count(conn_tmp); 4760 conn_count--; 4761 } 4762 } else { 4763 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4764 iscsit_cause_connection_reinstatement(conn, 0); 4765 } 4766 4767 if (session_sleep && atomic_read(&sess->nconn)) { 4768 spin_unlock_bh(&sess->conn_lock); 4769 wait_for_completion(&sess->session_wait_comp); 4770 } else 4771 spin_unlock_bh(&sess->conn_lock); 4772 } 4773 4774 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4775 { 4776 struct iscsi_session *sess; 4777 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4778 struct se_session *se_sess, *se_sess_tmp; 4779 int session_count = 0; 4780 4781 spin_lock_bh(&se_tpg->session_lock); 4782 if (tpg->nsessions && !force) { 4783 spin_unlock_bh(&se_tpg->session_lock); 4784 return -1; 4785 } 4786 4787 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4788 sess_list) { 4789 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4790 4791 spin_lock(&sess->conn_lock); 4792 if (atomic_read(&sess->session_fall_back_to_erl0) || 4793 atomic_read(&sess->session_logout) || 4794 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4795 spin_unlock(&sess->conn_lock); 4796 continue; 4797 } 4798 atomic_set(&sess->session_reinstatement, 1); 4799 spin_unlock(&sess->conn_lock); 4800 spin_unlock_bh(&se_tpg->session_lock); 4801 4802 iscsit_free_session(sess); 4803 spin_lock_bh(&se_tpg->session_lock); 4804 4805 session_count++; 4806 } 4807 spin_unlock_bh(&se_tpg->session_lock); 4808 4809 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4810 " Group: %hu\n", session_count, tpg->tpgt); 4811 return 0; 4812 } 4813 4814 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4815 MODULE_VERSION("4.1.x"); 4816 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4817 MODULE_LICENSE("GPL"); 4818 4819 module_init(iscsi_target_init_module); 4820 module_exit(iscsi_target_cleanup_module); 4821