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/vmalloc.h> 25 #include <linux/idr.h> 26 #include <asm/unaligned.h> 27 #include <scsi/scsi_proto.h> 28 #include <scsi/iscsi_proto.h> 29 #include <scsi/scsi_tcq.h> 30 #include <target/target_core_base.h> 31 #include <target/target_core_fabric.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) 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(&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(&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 /* only used for printks or comparing with ->ref_task_tag */ 1012 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1013 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1014 if (cmd->sense_reason) { 1015 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1016 return iscsit_add_reject_cmd(cmd, 1017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1018 } 1019 1020 goto attach_cmd; 1021 } 1022 1023 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1024 return iscsit_add_reject_cmd(cmd, 1025 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1026 } 1027 1028 attach_cmd: 1029 spin_lock_bh(&conn->cmd_lock); 1030 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1031 spin_unlock_bh(&conn->cmd_lock); 1032 /* 1033 * Check if we need to delay processing because of ALUA 1034 * Active/NonOptimized primary access state.. 1035 */ 1036 core_alua_check_nonop_delay(&cmd->se_cmd); 1037 1038 return 0; 1039 } 1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1041 1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1043 { 1044 iscsit_set_dataout_sequence_values(cmd); 1045 1046 spin_lock_bh(&cmd->dataout_timeout_lock); 1047 iscsit_start_dataout_timer(cmd, cmd->conn); 1048 spin_unlock_bh(&cmd->dataout_timeout_lock); 1049 } 1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1051 1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1053 struct iscsi_scsi_req *hdr) 1054 { 1055 int cmdsn_ret = 0; 1056 /* 1057 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1058 * the Immediate Bit is not set, and no Immediate 1059 * Data is attached. 1060 * 1061 * A PDU/CmdSN carrying Immediate Data can only 1062 * be processed after the DataCRC has passed. 1063 * If the DataCRC fails, the CmdSN MUST NOT 1064 * be acknowledged. (See below) 1065 */ 1066 if (!cmd->immediate_data) { 1067 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1068 (unsigned char *)hdr, hdr->cmdsn); 1069 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1070 return -1; 1071 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1072 target_put_sess_cmd(&cmd->se_cmd); 1073 return 0; 1074 } 1075 } 1076 1077 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1078 1079 /* 1080 * If no Immediate Data is attached, it's OK to return now. 1081 */ 1082 if (!cmd->immediate_data) { 1083 if (!cmd->sense_reason && cmd->unsolicited_data) 1084 iscsit_set_unsoliticed_dataout(cmd); 1085 if (!cmd->sense_reason) 1086 return 0; 1087 1088 target_put_sess_cmd(&cmd->se_cmd); 1089 return 0; 1090 } 1091 1092 /* 1093 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1094 * execution. These exceptions are processed in CmdSN order using 1095 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1096 */ 1097 if (cmd->sense_reason) { 1098 if (cmd->reject_reason) 1099 return 0; 1100 1101 return 1; 1102 } 1103 /* 1104 * Call directly into transport_generic_new_cmd() to perform 1105 * the backend memory allocation. 1106 */ 1107 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1108 if (cmd->sense_reason) 1109 return 1; 1110 1111 return 0; 1112 } 1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1114 1115 static int 1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1117 bool dump_payload) 1118 { 1119 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1120 /* 1121 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1122 */ 1123 if (dump_payload) 1124 goto after_immediate_data; 1125 1126 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1127 cmd->first_burst_len); 1128 after_immediate_data: 1129 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1130 /* 1131 * A PDU/CmdSN carrying Immediate Data passed 1132 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1133 * Immediate Bit is not set. 1134 */ 1135 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1136 (unsigned char *)hdr, hdr->cmdsn); 1137 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1138 return -1; 1139 1140 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1141 int rc; 1142 1143 rc = iscsit_dump_data_payload(cmd->conn, 1144 cmd->first_burst_len, 1); 1145 target_put_sess_cmd(&cmd->se_cmd); 1146 return rc; 1147 } else if (cmd->unsolicited_data) 1148 iscsit_set_unsoliticed_dataout(cmd); 1149 1150 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1151 /* 1152 * Immediate Data failed DataCRC and ERL>=1, 1153 * silently drop this PDU and let the initiator 1154 * plug the CmdSN gap. 1155 * 1156 * FIXME: Send Unsolicited NOPIN with reserved 1157 * TTT here to help the initiator figure out 1158 * the missing CmdSN, although they should be 1159 * intelligent enough to determine the missing 1160 * CmdSN and issue a retry to plug the sequence. 1161 */ 1162 cmd->i_state = ISTATE_REMOVE; 1163 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1164 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1165 return -1; 1166 1167 return 0; 1168 } 1169 1170 static int 1171 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1172 unsigned char *buf) 1173 { 1174 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1175 int rc, immed_data; 1176 bool dump_payload = false; 1177 1178 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1179 if (rc < 0) 1180 return 0; 1181 /* 1182 * Allocation iovecs needed for struct socket operations for 1183 * traditional iSCSI block I/O. 1184 */ 1185 if (iscsit_allocate_iovecs(cmd) < 0) { 1186 return iscsit_reject_cmd(cmd, 1187 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1188 } 1189 immed_data = cmd->immediate_data; 1190 1191 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1192 if (rc < 0) 1193 return rc; 1194 else if (rc > 0) 1195 dump_payload = true; 1196 1197 if (!immed_data) 1198 return 0; 1199 1200 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1201 } 1202 1203 static u32 iscsit_do_crypto_hash_sg( 1204 struct hash_desc *hash, 1205 struct iscsi_cmd *cmd, 1206 u32 data_offset, 1207 u32 data_length, 1208 u32 padding, 1209 u8 *pad_bytes) 1210 { 1211 u32 data_crc; 1212 u32 i; 1213 struct scatterlist *sg; 1214 unsigned int page_off; 1215 1216 crypto_hash_init(hash); 1217 1218 sg = cmd->first_data_sg; 1219 page_off = cmd->first_data_sg_off; 1220 1221 i = 0; 1222 while (data_length) { 1223 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1224 1225 crypto_hash_update(hash, &sg[i], cur_len); 1226 1227 data_length -= cur_len; 1228 page_off = 0; 1229 i++; 1230 } 1231 1232 if (padding) { 1233 struct scatterlist pad_sg; 1234 1235 sg_init_one(&pad_sg, pad_bytes, padding); 1236 crypto_hash_update(hash, &pad_sg, padding); 1237 } 1238 crypto_hash_final(hash, (u8 *) &data_crc); 1239 1240 return data_crc; 1241 } 1242 1243 static void iscsit_do_crypto_hash_buf( 1244 struct hash_desc *hash, 1245 const void *buf, 1246 u32 payload_length, 1247 u32 padding, 1248 u8 *pad_bytes, 1249 u8 *data_crc) 1250 { 1251 struct scatterlist sg; 1252 1253 crypto_hash_init(hash); 1254 1255 sg_init_one(&sg, buf, payload_length); 1256 crypto_hash_update(hash, &sg, payload_length); 1257 1258 if (padding) { 1259 sg_init_one(&sg, pad_bytes, padding); 1260 crypto_hash_update(hash, &sg, padding); 1261 } 1262 crypto_hash_final(hash, data_crc); 1263 } 1264 1265 int 1266 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1267 struct iscsi_cmd **out_cmd) 1268 { 1269 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1270 struct iscsi_cmd *cmd = NULL; 1271 struct se_cmd *se_cmd; 1272 u32 payload_length = ntoh24(hdr->dlength); 1273 int rc; 1274 1275 if (!payload_length) { 1276 pr_warn("DataOUT payload is ZERO, ignoring.\n"); 1277 return 0; 1278 } 1279 1280 /* iSCSI write */ 1281 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1282 1283 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1284 pr_err("DataSegmentLength: %u is greater than" 1285 " MaxXmitDataSegmentLength: %u\n", payload_length, 1286 conn->conn_ops->MaxXmitDataSegmentLength); 1287 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1288 buf); 1289 } 1290 1291 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1292 payload_length); 1293 if (!cmd) 1294 return 0; 1295 1296 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1297 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1298 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1299 payload_length, conn->cid); 1300 1301 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1302 pr_err("Command ITT: 0x%08x received DataOUT after" 1303 " last DataOUT received, dumping payload\n", 1304 cmd->init_task_tag); 1305 return iscsit_dump_data_payload(conn, payload_length, 1); 1306 } 1307 1308 if (cmd->data_direction != DMA_TO_DEVICE) { 1309 pr_err("Command ITT: 0x%08x received DataOUT for a" 1310 " NON-WRITE command.\n", cmd->init_task_tag); 1311 return iscsit_dump_data_payload(conn, payload_length, 1); 1312 } 1313 se_cmd = &cmd->se_cmd; 1314 iscsit_mod_dataout_timer(cmd); 1315 1316 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1317 pr_err("DataOut Offset: %u, Length %u greater than" 1318 " iSCSI Command EDTL %u, protocol error.\n", 1319 hdr->offset, payload_length, cmd->se_cmd.data_length); 1320 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1321 } 1322 1323 if (cmd->unsolicited_data) { 1324 int dump_unsolicited_data = 0; 1325 1326 if (conn->sess->sess_ops->InitialR2T) { 1327 pr_err("Received unexpected unsolicited data" 1328 " while InitialR2T=Yes, protocol error.\n"); 1329 transport_send_check_condition_and_sense(&cmd->se_cmd, 1330 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1331 return -1; 1332 } 1333 /* 1334 * Special case for dealing with Unsolicited DataOUT 1335 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1336 * failures; 1337 */ 1338 1339 /* Something's amiss if we're not in WRITE_PENDING state... */ 1340 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1341 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1342 dump_unsolicited_data = 1; 1343 1344 if (dump_unsolicited_data) { 1345 /* 1346 * Check if a delayed TASK_ABORTED status needs to 1347 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1348 * received with the unsolicitied data out. 1349 */ 1350 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1351 iscsit_stop_dataout_timer(cmd); 1352 1353 transport_check_aborted_status(se_cmd, 1354 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1355 return iscsit_dump_data_payload(conn, payload_length, 1); 1356 } 1357 } else { 1358 /* 1359 * For the normal solicited data path: 1360 * 1361 * Check for a delayed TASK_ABORTED status and dump any 1362 * incoming data out payload if one exists. Also, when the 1363 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1364 * data out sequence, we decrement outstanding_r2ts. Once 1365 * outstanding_r2ts reaches zero, go ahead and send the delayed 1366 * TASK_ABORTED status. 1367 */ 1368 if (se_cmd->transport_state & CMD_T_ABORTED) { 1369 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1370 if (--cmd->outstanding_r2ts < 1) { 1371 iscsit_stop_dataout_timer(cmd); 1372 transport_check_aborted_status( 1373 se_cmd, 1); 1374 } 1375 1376 return iscsit_dump_data_payload(conn, payload_length, 1); 1377 } 1378 } 1379 /* 1380 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1381 * within-command recovery checks before receiving the payload. 1382 */ 1383 rc = iscsit_check_pre_dataout(cmd, buf); 1384 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1385 return 0; 1386 else if (rc == DATAOUT_CANNOT_RECOVER) 1387 return -1; 1388 1389 *out_cmd = cmd; 1390 return 0; 1391 } 1392 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1393 1394 static int 1395 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1396 struct iscsi_data *hdr) 1397 { 1398 struct kvec *iov; 1399 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1400 u32 payload_length = ntoh24(hdr->dlength); 1401 int iov_ret, data_crc_failed = 0; 1402 1403 rx_size += payload_length; 1404 iov = &cmd->iov_data[0]; 1405 1406 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1407 payload_length); 1408 if (iov_ret < 0) 1409 return -1; 1410 1411 iov_count += iov_ret; 1412 1413 padding = ((-payload_length) & 3); 1414 if (padding != 0) { 1415 iov[iov_count].iov_base = cmd->pad_bytes; 1416 iov[iov_count++].iov_len = padding; 1417 rx_size += padding; 1418 pr_debug("Receiving %u padding bytes.\n", padding); 1419 } 1420 1421 if (conn->conn_ops->DataDigest) { 1422 iov[iov_count].iov_base = &checksum; 1423 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1424 rx_size += ISCSI_CRC_LEN; 1425 } 1426 1427 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1428 1429 iscsit_unmap_iovec(cmd); 1430 1431 if (rx_got != rx_size) 1432 return -1; 1433 1434 if (conn->conn_ops->DataDigest) { 1435 u32 data_crc; 1436 1437 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1438 be32_to_cpu(hdr->offset), 1439 payload_length, padding, 1440 cmd->pad_bytes); 1441 1442 if (checksum != data_crc) { 1443 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1444 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1445 " does not match computed 0x%08x\n", 1446 hdr->itt, hdr->offset, payload_length, 1447 hdr->datasn, checksum, data_crc); 1448 data_crc_failed = 1; 1449 } else { 1450 pr_debug("Got CRC32C DataDigest 0x%08x for" 1451 " %u bytes of Data Out\n", checksum, 1452 payload_length); 1453 } 1454 } 1455 1456 return data_crc_failed; 1457 } 1458 1459 int 1460 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1461 bool data_crc_failed) 1462 { 1463 struct iscsi_conn *conn = cmd->conn; 1464 int rc, ooo_cmdsn; 1465 /* 1466 * Increment post receive data and CRC values or perform 1467 * within-command recovery. 1468 */ 1469 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1470 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1471 return 0; 1472 else if (rc == DATAOUT_SEND_R2T) { 1473 iscsit_set_dataout_sequence_values(cmd); 1474 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1475 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1476 /* 1477 * Handle extra special case for out of order 1478 * Unsolicited Data Out. 1479 */ 1480 spin_lock_bh(&cmd->istate_lock); 1481 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1482 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1483 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1484 spin_unlock_bh(&cmd->istate_lock); 1485 1486 iscsit_stop_dataout_timer(cmd); 1487 if (ooo_cmdsn) 1488 return 0; 1489 target_execute_cmd(&cmd->se_cmd); 1490 return 0; 1491 } else /* DATAOUT_CANNOT_RECOVER */ 1492 return -1; 1493 1494 return 0; 1495 } 1496 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1497 1498 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1499 { 1500 struct iscsi_cmd *cmd = NULL; 1501 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1502 int rc; 1503 bool data_crc_failed = false; 1504 1505 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1506 if (rc < 0) 1507 return 0; 1508 else if (!cmd) 1509 return 0; 1510 1511 rc = iscsit_get_dataout(conn, cmd, hdr); 1512 if (rc < 0) 1513 return rc; 1514 else if (rc > 0) 1515 data_crc_failed = true; 1516 1517 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1518 } 1519 1520 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1521 struct iscsi_nopout *hdr) 1522 { 1523 u32 payload_length = ntoh24(hdr->dlength); 1524 1525 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1526 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1527 if (!cmd) 1528 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1529 (unsigned char *)hdr); 1530 1531 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1532 (unsigned char *)hdr); 1533 } 1534 1535 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1536 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1537 " not set, protocol error.\n"); 1538 if (!cmd) 1539 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1540 (unsigned char *)hdr); 1541 1542 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1543 (unsigned char *)hdr); 1544 } 1545 1546 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1547 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1548 " greater than MaxXmitDataSegmentLength: %u, protocol" 1549 " error.\n", payload_length, 1550 conn->conn_ops->MaxXmitDataSegmentLength); 1551 if (!cmd) 1552 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1553 (unsigned char *)hdr); 1554 1555 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1556 (unsigned char *)hdr); 1557 } 1558 1559 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1560 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1561 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1562 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1563 payload_length); 1564 /* 1565 * This is not a response to a Unsolicited NopIN, which means 1566 * it can either be a NOPOUT ping request (with a valid ITT), 1567 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1568 * Either way, make sure we allocate an struct iscsi_cmd, as both 1569 * can contain ping data. 1570 */ 1571 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1572 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1573 cmd->i_state = ISTATE_SEND_NOPIN; 1574 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1575 1 : 0); 1576 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1577 cmd->targ_xfer_tag = 0xFFFFFFFF; 1578 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1579 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1580 cmd->data_direction = DMA_NONE; 1581 } 1582 1583 return 0; 1584 } 1585 EXPORT_SYMBOL(iscsit_setup_nop_out); 1586 1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1588 struct iscsi_nopout *hdr) 1589 { 1590 struct iscsi_cmd *cmd_p = NULL; 1591 int cmdsn_ret = 0; 1592 /* 1593 * Initiator is expecting a NopIN ping reply.. 1594 */ 1595 if (hdr->itt != RESERVED_ITT) { 1596 if (!cmd) 1597 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1598 (unsigned char *)hdr); 1599 1600 spin_lock_bh(&conn->cmd_lock); 1601 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1602 spin_unlock_bh(&conn->cmd_lock); 1603 1604 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1605 1606 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1607 iscsit_add_cmd_to_response_queue(cmd, conn, 1608 cmd->i_state); 1609 return 0; 1610 } 1611 1612 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1613 (unsigned char *)hdr, hdr->cmdsn); 1614 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1615 return 0; 1616 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1617 return -1; 1618 1619 return 0; 1620 } 1621 /* 1622 * This was a response to a unsolicited NOPIN ping. 1623 */ 1624 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1625 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1626 if (!cmd_p) 1627 return -EINVAL; 1628 1629 iscsit_stop_nopin_response_timer(conn); 1630 1631 cmd_p->i_state = ISTATE_REMOVE; 1632 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1633 1634 iscsit_start_nopin_timer(conn); 1635 return 0; 1636 } 1637 /* 1638 * Otherwise, initiator is not expecting a NOPIN is response. 1639 * Just ignore for now. 1640 */ 1641 return 0; 1642 } 1643 EXPORT_SYMBOL(iscsit_process_nop_out); 1644 1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1646 unsigned char *buf) 1647 { 1648 unsigned char *ping_data = NULL; 1649 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1650 struct kvec *iov = NULL; 1651 u32 payload_length = ntoh24(hdr->dlength); 1652 int ret; 1653 1654 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1655 if (ret < 0) 1656 return 0; 1657 /* 1658 * Handle NOP-OUT payload for traditional iSCSI sockets 1659 */ 1660 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1661 u32 checksum, data_crc, padding = 0; 1662 int niov = 0, rx_got, rx_size = payload_length; 1663 1664 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1665 if (!ping_data) { 1666 pr_err("Unable to allocate memory for" 1667 " NOPOUT ping data.\n"); 1668 ret = -1; 1669 goto out; 1670 } 1671 1672 iov = &cmd->iov_misc[0]; 1673 iov[niov].iov_base = ping_data; 1674 iov[niov++].iov_len = payload_length; 1675 1676 padding = ((-payload_length) & 3); 1677 if (padding != 0) { 1678 pr_debug("Receiving %u additional bytes" 1679 " for padding.\n", padding); 1680 iov[niov].iov_base = &cmd->pad_bytes; 1681 iov[niov++].iov_len = padding; 1682 rx_size += padding; 1683 } 1684 if (conn->conn_ops->DataDigest) { 1685 iov[niov].iov_base = &checksum; 1686 iov[niov++].iov_len = ISCSI_CRC_LEN; 1687 rx_size += ISCSI_CRC_LEN; 1688 } 1689 1690 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1691 if (rx_got != rx_size) { 1692 ret = -1; 1693 goto out; 1694 } 1695 1696 if (conn->conn_ops->DataDigest) { 1697 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1698 ping_data, payload_length, 1699 padding, cmd->pad_bytes, 1700 (u8 *)&data_crc); 1701 1702 if (checksum != data_crc) { 1703 pr_err("Ping data CRC32C DataDigest" 1704 " 0x%08x does not match computed 0x%08x\n", 1705 checksum, data_crc); 1706 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1707 pr_err("Unable to recover from" 1708 " NOPOUT Ping DataCRC failure while in" 1709 " ERL=0.\n"); 1710 ret = -1; 1711 goto out; 1712 } else { 1713 /* 1714 * Silently drop this PDU and let the 1715 * initiator plug the CmdSN gap. 1716 */ 1717 pr_debug("Dropping NOPOUT" 1718 " Command CmdSN: 0x%08x due to" 1719 " DataCRC error.\n", hdr->cmdsn); 1720 ret = 0; 1721 goto out; 1722 } 1723 } else { 1724 pr_debug("Got CRC32C DataDigest" 1725 " 0x%08x for %u bytes of ping data.\n", 1726 checksum, payload_length); 1727 } 1728 } 1729 1730 ping_data[payload_length] = '\0'; 1731 /* 1732 * Attach ping data to struct iscsi_cmd->buf_ptr. 1733 */ 1734 cmd->buf_ptr = ping_data; 1735 cmd->buf_ptr_size = payload_length; 1736 1737 pr_debug("Got %u bytes of NOPOUT ping" 1738 " data.\n", payload_length); 1739 pr_debug("Ping Data: \"%s\"\n", ping_data); 1740 } 1741 1742 return iscsit_process_nop_out(conn, cmd, hdr); 1743 out: 1744 if (cmd) 1745 iscsit_free_cmd(cmd, false); 1746 1747 kfree(ping_data); 1748 return ret; 1749 } 1750 1751 int 1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1753 unsigned char *buf) 1754 { 1755 struct se_tmr_req *se_tmr; 1756 struct iscsi_tmr_req *tmr_req; 1757 struct iscsi_tm *hdr; 1758 int out_of_order_cmdsn = 0, ret; 1759 bool sess_ref = false; 1760 u8 function; 1761 1762 hdr = (struct iscsi_tm *) buf; 1763 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1764 function = hdr->flags; 1765 1766 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1767 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1768 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1769 hdr->rtt, hdr->refcmdsn, conn->cid); 1770 1771 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1772 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1773 hdr->rtt != RESERVED_ITT)) { 1774 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1775 hdr->rtt = RESERVED_ITT; 1776 } 1777 1778 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1779 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1780 pr_err("Task Management Request TASK_REASSIGN not" 1781 " issued as immediate command, bad iSCSI Initiator" 1782 "implementation\n"); 1783 return iscsit_add_reject_cmd(cmd, 1784 ISCSI_REASON_PROTOCOL_ERROR, buf); 1785 } 1786 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1787 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1788 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1789 1790 cmd->data_direction = DMA_NONE; 1791 1792 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1793 if (!cmd->tmr_req) { 1794 pr_err("Unable to allocate memory for" 1795 " Task Management command!\n"); 1796 return iscsit_add_reject_cmd(cmd, 1797 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1798 buf); 1799 } 1800 1801 /* 1802 * TASK_REASSIGN for ERL=2 / connection stays inside of 1803 * LIO-Target $FABRIC_MOD 1804 */ 1805 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1806 1807 u8 tcm_function; 1808 int ret; 1809 1810 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1811 conn->sess->se_sess, 0, DMA_NONE, 1812 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 1813 1814 target_get_sess_cmd(&cmd->se_cmd, true); 1815 sess_ref = true; 1816 1817 switch (function) { 1818 case ISCSI_TM_FUNC_ABORT_TASK: 1819 tcm_function = TMR_ABORT_TASK; 1820 break; 1821 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1822 tcm_function = TMR_ABORT_TASK_SET; 1823 break; 1824 case ISCSI_TM_FUNC_CLEAR_ACA: 1825 tcm_function = TMR_CLEAR_ACA; 1826 break; 1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1828 tcm_function = TMR_CLEAR_TASK_SET; 1829 break; 1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1831 tcm_function = TMR_LUN_RESET; 1832 break; 1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1834 tcm_function = TMR_TARGET_WARM_RESET; 1835 break; 1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1837 tcm_function = TMR_TARGET_COLD_RESET; 1838 break; 1839 default: 1840 pr_err("Unknown iSCSI TMR Function:" 1841 " 0x%02x\n", function); 1842 return iscsit_add_reject_cmd(cmd, 1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1844 } 1845 1846 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1847 tcm_function, GFP_KERNEL); 1848 if (ret < 0) 1849 return iscsit_add_reject_cmd(cmd, 1850 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1851 1852 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1853 } 1854 1855 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1856 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1857 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1858 cmd->init_task_tag = hdr->itt; 1859 cmd->targ_xfer_tag = 0xFFFFFFFF; 1860 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1861 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1862 se_tmr = cmd->se_cmd.se_tmr_req; 1863 tmr_req = cmd->tmr_req; 1864 /* 1865 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1866 */ 1867 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1868 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1869 scsilun_to_int(&hdr->lun)); 1870 if (ret < 0) { 1871 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1872 goto attach; 1873 } 1874 } 1875 1876 switch (function) { 1877 case ISCSI_TM_FUNC_ABORT_TASK: 1878 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1879 if (se_tmr->response) 1880 goto attach; 1881 break; 1882 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1883 case ISCSI_TM_FUNC_CLEAR_ACA: 1884 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1885 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1886 break; 1887 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1888 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1889 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1890 goto attach; 1891 } 1892 break; 1893 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1894 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1895 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1896 goto attach; 1897 } 1898 break; 1899 case ISCSI_TM_FUNC_TASK_REASSIGN: 1900 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1901 /* 1902 * Perform sanity checks on the ExpDataSN only if the 1903 * TASK_REASSIGN was successful. 1904 */ 1905 if (se_tmr->response) 1906 break; 1907 1908 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1909 return iscsit_add_reject_cmd(cmd, 1910 ISCSI_REASON_BOOKMARK_INVALID, buf); 1911 break; 1912 default: 1913 pr_err("Unknown TMR function: 0x%02x, protocol" 1914 " error.\n", function); 1915 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1916 goto attach; 1917 } 1918 1919 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1920 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1921 se_tmr->call_transport = 1; 1922 attach: 1923 spin_lock_bh(&conn->cmd_lock); 1924 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1925 spin_unlock_bh(&conn->cmd_lock); 1926 1927 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1928 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 1929 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1930 out_of_order_cmdsn = 1; 1931 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1932 return 0; 1933 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1934 return -1; 1935 } 1936 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1937 1938 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1939 return 0; 1940 /* 1941 * Found the referenced task, send to transport for processing. 1942 */ 1943 if (se_tmr->call_transport) 1944 return transport_generic_handle_tmr(&cmd->se_cmd); 1945 1946 /* 1947 * Could not find the referenced LUN, task, or Task Management 1948 * command not authorized or supported. Change state and 1949 * let the tx_thread send the response. 1950 * 1951 * For connection recovery, this is also the default action for 1952 * TMR TASK_REASSIGN. 1953 */ 1954 if (sess_ref) { 1955 pr_debug("Handle TMR, using sess_ref=true check\n"); 1956 target_put_sess_cmd(&cmd->se_cmd); 1957 } 1958 1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1960 return 0; 1961 } 1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1963 1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1965 int 1966 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1967 struct iscsi_text *hdr) 1968 { 1969 u32 payload_length = ntoh24(hdr->dlength); 1970 1971 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1972 pr_err("Unable to accept text parameter length: %u" 1973 "greater than MaxXmitDataSegmentLength %u.\n", 1974 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1975 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1976 (unsigned char *)hdr); 1977 } 1978 1979 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 1980 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 1981 pr_err("Multi sequence text commands currently not supported\n"); 1982 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 1983 (unsigned char *)hdr); 1984 } 1985 1986 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1987 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1988 hdr->exp_statsn, payload_length); 1989 1990 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1991 cmd->i_state = ISTATE_SEND_TEXTRSP; 1992 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1993 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1994 cmd->targ_xfer_tag = 0xFFFFFFFF; 1995 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1996 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1997 cmd->data_direction = DMA_NONE; 1998 cmd->text_in_ptr = NULL; 1999 2000 return 0; 2001 } 2002 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2003 2004 int 2005 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2006 struct iscsi_text *hdr) 2007 { 2008 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2009 int cmdsn_ret; 2010 2011 if (!text_in) { 2012 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2013 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2014 pr_err("Unable to locate text_in buffer for sendtargets" 2015 " discovery\n"); 2016 goto reject; 2017 } 2018 goto empty_sendtargets; 2019 } 2020 if (strncmp("SendTargets", text_in, 11) != 0) { 2021 pr_err("Received Text Data that is not" 2022 " SendTargets, cannot continue.\n"); 2023 goto reject; 2024 } 2025 text_ptr = strchr(text_in, '='); 2026 if (!text_ptr) { 2027 pr_err("No \"=\" separator found in Text Data," 2028 " cannot continue.\n"); 2029 goto reject; 2030 } 2031 if (!strncmp("=All", text_ptr, 4)) { 2032 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2033 } else if (!strncmp("=iqn.", text_ptr, 5) || 2034 !strncmp("=eui.", text_ptr, 5)) { 2035 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2036 } else { 2037 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2038 goto reject; 2039 } 2040 2041 spin_lock_bh(&conn->cmd_lock); 2042 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2043 spin_unlock_bh(&conn->cmd_lock); 2044 2045 empty_sendtargets: 2046 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2047 2048 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2049 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2050 (unsigned char *)hdr, hdr->cmdsn); 2051 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2052 return -1; 2053 2054 return 0; 2055 } 2056 2057 return iscsit_execute_cmd(cmd, 0); 2058 2059 reject: 2060 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2061 (unsigned char *)hdr); 2062 } 2063 EXPORT_SYMBOL(iscsit_process_text_cmd); 2064 2065 static int 2066 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2067 unsigned char *buf) 2068 { 2069 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2070 char *text_in = NULL; 2071 u32 payload_length = ntoh24(hdr->dlength); 2072 int rx_size, rc; 2073 2074 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2075 if (rc < 0) 2076 return 0; 2077 2078 rx_size = payload_length; 2079 if (payload_length) { 2080 u32 checksum = 0, data_crc = 0; 2081 u32 padding = 0, pad_bytes = 0; 2082 int niov = 0, rx_got; 2083 struct kvec iov[3]; 2084 2085 text_in = kzalloc(payload_length, GFP_KERNEL); 2086 if (!text_in) { 2087 pr_err("Unable to allocate memory for" 2088 " incoming text parameters\n"); 2089 goto reject; 2090 } 2091 cmd->text_in_ptr = text_in; 2092 2093 memset(iov, 0, 3 * sizeof(struct kvec)); 2094 iov[niov].iov_base = text_in; 2095 iov[niov++].iov_len = payload_length; 2096 2097 padding = ((-payload_length) & 3); 2098 if (padding != 0) { 2099 iov[niov].iov_base = &pad_bytes; 2100 iov[niov++].iov_len = padding; 2101 rx_size += padding; 2102 pr_debug("Receiving %u additional bytes" 2103 " for padding.\n", padding); 2104 } 2105 if (conn->conn_ops->DataDigest) { 2106 iov[niov].iov_base = &checksum; 2107 iov[niov++].iov_len = ISCSI_CRC_LEN; 2108 rx_size += ISCSI_CRC_LEN; 2109 } 2110 2111 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2112 if (rx_got != rx_size) 2113 goto reject; 2114 2115 if (conn->conn_ops->DataDigest) { 2116 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2117 text_in, payload_length, 2118 padding, (u8 *)&pad_bytes, 2119 (u8 *)&data_crc); 2120 2121 if (checksum != data_crc) { 2122 pr_err("Text data CRC32C DataDigest" 2123 " 0x%08x does not match computed" 2124 " 0x%08x\n", checksum, data_crc); 2125 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2126 pr_err("Unable to recover from" 2127 " Text Data digest failure while in" 2128 " ERL=0.\n"); 2129 goto reject; 2130 } else { 2131 /* 2132 * Silently drop this PDU and let the 2133 * initiator plug the CmdSN gap. 2134 */ 2135 pr_debug("Dropping Text" 2136 " Command CmdSN: 0x%08x due to" 2137 " DataCRC error.\n", hdr->cmdsn); 2138 kfree(text_in); 2139 return 0; 2140 } 2141 } else { 2142 pr_debug("Got CRC32C DataDigest" 2143 " 0x%08x for %u bytes of text data.\n", 2144 checksum, payload_length); 2145 } 2146 } 2147 text_in[payload_length - 1] = '\0'; 2148 pr_debug("Successfully read %d bytes of text" 2149 " data.\n", payload_length); 2150 } 2151 2152 return iscsit_process_text_cmd(conn, cmd, hdr); 2153 2154 reject: 2155 kfree(cmd->text_in_ptr); 2156 cmd->text_in_ptr = NULL; 2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2158 } 2159 2160 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2161 { 2162 struct iscsi_conn *conn_p; 2163 struct iscsi_session *sess = conn->sess; 2164 2165 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2166 " for SID: %u.\n", conn->cid, conn->sess->sid); 2167 2168 atomic_set(&sess->session_logout, 1); 2169 atomic_set(&conn->conn_logout_remove, 1); 2170 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2171 2172 iscsit_inc_conn_usage_count(conn); 2173 iscsit_inc_session_usage_count(sess); 2174 2175 spin_lock_bh(&sess->conn_lock); 2176 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2177 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2178 continue; 2179 2180 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2181 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2182 } 2183 spin_unlock_bh(&sess->conn_lock); 2184 2185 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2186 2187 return 0; 2188 } 2189 2190 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2191 { 2192 struct iscsi_conn *l_conn; 2193 struct iscsi_session *sess = conn->sess; 2194 2195 pr_debug("Received logout request CLOSECONNECTION for CID:" 2196 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2197 2198 /* 2199 * A Logout Request with a CLOSECONNECTION reason code for a CID 2200 * can arrive on a connection with a differing CID. 2201 */ 2202 if (conn->cid == cmd->logout_cid) { 2203 spin_lock_bh(&conn->state_lock); 2204 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2205 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2206 2207 atomic_set(&conn->conn_logout_remove, 1); 2208 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2209 iscsit_inc_conn_usage_count(conn); 2210 2211 spin_unlock_bh(&conn->state_lock); 2212 } else { 2213 /* 2214 * Handle all different cid CLOSECONNECTION requests in 2215 * iscsit_logout_post_handler_diffcid() as to give enough 2216 * time for any non immediate command's CmdSN to be 2217 * acknowledged on the connection in question. 2218 * 2219 * Here we simply make sure the CID is still around. 2220 */ 2221 l_conn = iscsit_get_conn_from_cid(sess, 2222 cmd->logout_cid); 2223 if (!l_conn) { 2224 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2225 iscsit_add_cmd_to_response_queue(cmd, conn, 2226 cmd->i_state); 2227 return 0; 2228 } 2229 2230 iscsit_dec_conn_usage_count(l_conn); 2231 } 2232 2233 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2234 2235 return 0; 2236 } 2237 2238 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2239 { 2240 struct iscsi_session *sess = conn->sess; 2241 2242 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2243 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2244 2245 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2246 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2247 " while ERL!=2.\n"); 2248 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2249 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2250 return 0; 2251 } 2252 2253 if (conn->cid == cmd->logout_cid) { 2254 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2255 " with CID: %hu on CID: %hu, implementation error.\n", 2256 cmd->logout_cid, conn->cid); 2257 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2258 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2259 return 0; 2260 } 2261 2262 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2263 2264 return 0; 2265 } 2266 2267 int 2268 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2269 unsigned char *buf) 2270 { 2271 int cmdsn_ret, logout_remove = 0; 2272 u8 reason_code = 0; 2273 struct iscsi_logout *hdr; 2274 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2275 2276 hdr = (struct iscsi_logout *) buf; 2277 reason_code = (hdr->flags & 0x7f); 2278 2279 if (tiqn) { 2280 spin_lock(&tiqn->logout_stats.lock); 2281 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2282 tiqn->logout_stats.normal_logouts++; 2283 else 2284 tiqn->logout_stats.abnormal_logouts++; 2285 spin_unlock(&tiqn->logout_stats.lock); 2286 } 2287 2288 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2289 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2290 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2291 hdr->cid, conn->cid); 2292 2293 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2294 pr_err("Received logout request on connection that" 2295 " is not in logged in state, ignoring request.\n"); 2296 iscsit_free_cmd(cmd, false); 2297 return 0; 2298 } 2299 2300 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2301 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2302 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2303 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2304 cmd->targ_xfer_tag = 0xFFFFFFFF; 2305 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2306 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2307 cmd->logout_cid = be16_to_cpu(hdr->cid); 2308 cmd->logout_reason = reason_code; 2309 cmd->data_direction = DMA_NONE; 2310 2311 /* 2312 * We need to sleep in these cases (by returning 1) until the Logout 2313 * Response gets sent in the tx thread. 2314 */ 2315 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2316 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2317 be16_to_cpu(hdr->cid) == conn->cid)) 2318 logout_remove = 1; 2319 2320 spin_lock_bh(&conn->cmd_lock); 2321 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2322 spin_unlock_bh(&conn->cmd_lock); 2323 2324 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2325 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2326 2327 /* 2328 * Immediate commands are executed, well, immediately. 2329 * Non-Immediate Logout Commands are executed in CmdSN order. 2330 */ 2331 if (cmd->immediate_cmd) { 2332 int ret = iscsit_execute_cmd(cmd, 0); 2333 2334 if (ret < 0) 2335 return ret; 2336 } else { 2337 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2338 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2339 logout_remove = 0; 2340 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2341 return -1; 2342 } 2343 2344 return logout_remove; 2345 } 2346 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2347 2348 static int iscsit_handle_snack( 2349 struct iscsi_conn *conn, 2350 unsigned char *buf) 2351 { 2352 struct iscsi_snack *hdr; 2353 2354 hdr = (struct iscsi_snack *) buf; 2355 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2356 2357 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2358 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2359 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2360 hdr->begrun, hdr->runlength, conn->cid); 2361 2362 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2363 pr_err("Initiator sent SNACK request while in" 2364 " ErrorRecoveryLevel=0.\n"); 2365 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2366 buf); 2367 } 2368 /* 2369 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2370 * call from inside iscsi_send_recovery_datain_or_r2t(). 2371 */ 2372 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2373 case 0: 2374 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2375 hdr->itt, 2376 be32_to_cpu(hdr->ttt), 2377 be32_to_cpu(hdr->begrun), 2378 be32_to_cpu(hdr->runlength)); 2379 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2380 return iscsit_handle_status_snack(conn, hdr->itt, 2381 be32_to_cpu(hdr->ttt), 2382 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2383 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2384 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2385 be32_to_cpu(hdr->begrun), 2386 be32_to_cpu(hdr->runlength)); 2387 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2388 /* FIXME: Support R-Data SNACK */ 2389 pr_err("R-Data SNACK Not Supported.\n"); 2390 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2391 buf); 2392 default: 2393 pr_err("Unknown SNACK type 0x%02x, protocol" 2394 " error.\n", hdr->flags & 0x0f); 2395 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2396 buf); 2397 } 2398 2399 return 0; 2400 } 2401 2402 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2403 { 2404 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2405 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2406 wait_for_completion_interruptible_timeout( 2407 &conn->rx_half_close_comp, 2408 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2409 } 2410 } 2411 2412 static int iscsit_handle_immediate_data( 2413 struct iscsi_cmd *cmd, 2414 struct iscsi_scsi_req *hdr, 2415 u32 length) 2416 { 2417 int iov_ret, rx_got = 0, rx_size = 0; 2418 u32 checksum, iov_count = 0, padding = 0; 2419 struct iscsi_conn *conn = cmd->conn; 2420 struct kvec *iov; 2421 2422 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2423 if (iov_ret < 0) 2424 return IMMEDIATE_DATA_CANNOT_RECOVER; 2425 2426 rx_size = length; 2427 iov_count = iov_ret; 2428 iov = &cmd->iov_data[0]; 2429 2430 padding = ((-length) & 3); 2431 if (padding != 0) { 2432 iov[iov_count].iov_base = cmd->pad_bytes; 2433 iov[iov_count++].iov_len = padding; 2434 rx_size += padding; 2435 } 2436 2437 if (conn->conn_ops->DataDigest) { 2438 iov[iov_count].iov_base = &checksum; 2439 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2440 rx_size += ISCSI_CRC_LEN; 2441 } 2442 2443 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2444 2445 iscsit_unmap_iovec(cmd); 2446 2447 if (rx_got != rx_size) { 2448 iscsit_rx_thread_wait_for_tcp(conn); 2449 return IMMEDIATE_DATA_CANNOT_RECOVER; 2450 } 2451 2452 if (conn->conn_ops->DataDigest) { 2453 u32 data_crc; 2454 2455 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2456 cmd->write_data_done, length, padding, 2457 cmd->pad_bytes); 2458 2459 if (checksum != data_crc) { 2460 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2461 " does not match computed 0x%08x\n", checksum, 2462 data_crc); 2463 2464 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2465 pr_err("Unable to recover from" 2466 " Immediate Data digest failure while" 2467 " in ERL=0.\n"); 2468 iscsit_reject_cmd(cmd, 2469 ISCSI_REASON_DATA_DIGEST_ERROR, 2470 (unsigned char *)hdr); 2471 return IMMEDIATE_DATA_CANNOT_RECOVER; 2472 } else { 2473 iscsit_reject_cmd(cmd, 2474 ISCSI_REASON_DATA_DIGEST_ERROR, 2475 (unsigned char *)hdr); 2476 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2477 } 2478 } else { 2479 pr_debug("Got CRC32C DataDigest 0x%08x for" 2480 " %u bytes of Immediate Data\n", checksum, 2481 length); 2482 } 2483 } 2484 2485 cmd->write_data_done += length; 2486 2487 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2488 spin_lock_bh(&cmd->istate_lock); 2489 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2490 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2491 spin_unlock_bh(&cmd->istate_lock); 2492 } 2493 2494 return IMMEDIATE_DATA_NORMAL_OPERATION; 2495 } 2496 2497 /* 2498 * Called with sess->conn_lock held. 2499 */ 2500 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2501 with active network interface */ 2502 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2503 { 2504 struct iscsi_cmd *cmd; 2505 struct iscsi_conn *conn_p; 2506 bool found = false; 2507 2508 /* 2509 * Only send a Asynchronous Message on connections whos network 2510 * interface is still functional. 2511 */ 2512 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2513 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2514 iscsit_inc_conn_usage_count(conn_p); 2515 found = true; 2516 break; 2517 } 2518 } 2519 2520 if (!found) 2521 return; 2522 2523 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2524 if (!cmd) { 2525 iscsit_dec_conn_usage_count(conn_p); 2526 return; 2527 } 2528 2529 cmd->logout_cid = conn->cid; 2530 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2531 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2532 2533 spin_lock_bh(&conn_p->cmd_lock); 2534 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2535 spin_unlock_bh(&conn_p->cmd_lock); 2536 2537 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2538 iscsit_dec_conn_usage_count(conn_p); 2539 } 2540 2541 static int iscsit_send_conn_drop_async_message( 2542 struct iscsi_cmd *cmd, 2543 struct iscsi_conn *conn) 2544 { 2545 struct iscsi_async *hdr; 2546 2547 cmd->tx_size = ISCSI_HDR_LEN; 2548 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2549 2550 hdr = (struct iscsi_async *) cmd->pdu; 2551 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2552 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2553 cmd->init_task_tag = RESERVED_ITT; 2554 cmd->targ_xfer_tag = 0xFFFFFFFF; 2555 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2556 cmd->stat_sn = conn->stat_sn++; 2557 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2558 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2559 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2560 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2561 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2562 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2563 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2564 2565 if (conn->conn_ops->HeaderDigest) { 2566 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2567 2568 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2569 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2570 2571 cmd->tx_size += ISCSI_CRC_LEN; 2572 pr_debug("Attaching CRC32C HeaderDigest to" 2573 " Async Message 0x%08x\n", *header_digest); 2574 } 2575 2576 cmd->iov_misc[0].iov_base = cmd->pdu; 2577 cmd->iov_misc[0].iov_len = cmd->tx_size; 2578 cmd->iov_misc_count = 1; 2579 2580 pr_debug("Sending Connection Dropped Async Message StatSN:" 2581 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2582 cmd->logout_cid, conn->cid); 2583 return 0; 2584 } 2585 2586 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2587 { 2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2590 wait_for_completion_interruptible_timeout( 2591 &conn->tx_half_close_comp, 2592 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2593 } 2594 } 2595 2596 static void 2597 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2598 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2599 bool set_statsn) 2600 { 2601 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2602 hdr->flags = datain->flags; 2603 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2604 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2605 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2606 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2607 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2608 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2609 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2610 } 2611 } 2612 hton24(hdr->dlength, datain->length); 2613 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2614 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2615 (struct scsi_lun *)&hdr->lun); 2616 else 2617 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2618 2619 hdr->itt = cmd->init_task_tag; 2620 2621 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2622 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2623 else 2624 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2625 if (set_statsn) 2626 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2627 else 2628 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2629 2630 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2631 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2632 hdr->datasn = cpu_to_be32(datain->data_sn); 2633 hdr->offset = cpu_to_be32(datain->offset); 2634 2635 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2636 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2637 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2638 ntohl(hdr->offset), datain->length, conn->cid); 2639 } 2640 2641 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2642 { 2643 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2644 struct iscsi_datain datain; 2645 struct iscsi_datain_req *dr; 2646 struct kvec *iov; 2647 u32 iov_count = 0, tx_size = 0; 2648 int eodr = 0, ret, iov_ret; 2649 bool set_statsn = false; 2650 2651 memset(&datain, 0, sizeof(struct iscsi_datain)); 2652 dr = iscsit_get_datain_values(cmd, &datain); 2653 if (!dr) { 2654 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2655 cmd->init_task_tag); 2656 return -1; 2657 } 2658 /* 2659 * Be paranoid and double check the logic for now. 2660 */ 2661 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2662 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2663 " datain.length: %u exceeds cmd->data_length: %u\n", 2664 cmd->init_task_tag, datain.offset, datain.length, 2665 cmd->se_cmd.data_length); 2666 return -1; 2667 } 2668 2669 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2670 /* 2671 * Special case for successfully execution w/ both DATAIN 2672 * and Sense Data. 2673 */ 2674 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2675 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2676 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2677 else { 2678 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2679 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2680 iscsit_increment_maxcmdsn(cmd, conn->sess); 2681 cmd->stat_sn = conn->stat_sn++; 2682 set_statsn = true; 2683 } else if (dr->dr_complete == 2684 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2685 set_statsn = true; 2686 } 2687 2688 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2689 2690 iov = &cmd->iov_data[0]; 2691 iov[iov_count].iov_base = cmd->pdu; 2692 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2693 tx_size += ISCSI_HDR_LEN; 2694 2695 if (conn->conn_ops->HeaderDigest) { 2696 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2697 2698 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2699 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2700 2701 iov[0].iov_len += ISCSI_CRC_LEN; 2702 tx_size += ISCSI_CRC_LEN; 2703 2704 pr_debug("Attaching CRC32 HeaderDigest" 2705 " for DataIN PDU 0x%08x\n", *header_digest); 2706 } 2707 2708 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2709 datain.offset, datain.length); 2710 if (iov_ret < 0) 2711 return -1; 2712 2713 iov_count += iov_ret; 2714 tx_size += datain.length; 2715 2716 cmd->padding = ((-datain.length) & 3); 2717 if (cmd->padding) { 2718 iov[iov_count].iov_base = cmd->pad_bytes; 2719 iov[iov_count++].iov_len = cmd->padding; 2720 tx_size += cmd->padding; 2721 2722 pr_debug("Attaching %u padding bytes\n", 2723 cmd->padding); 2724 } 2725 if (conn->conn_ops->DataDigest) { 2726 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2727 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2728 2729 iov[iov_count].iov_base = &cmd->data_crc; 2730 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2731 tx_size += ISCSI_CRC_LEN; 2732 2733 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2734 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2735 } 2736 2737 cmd->iov_data_count = iov_count; 2738 cmd->tx_size = tx_size; 2739 2740 ret = iscsit_fe_sendpage_sg(cmd, conn); 2741 2742 iscsit_unmap_iovec(cmd); 2743 2744 if (ret < 0) { 2745 iscsit_tx_thread_wait_for_tcp(conn); 2746 return ret; 2747 } 2748 2749 if (dr->dr_complete) { 2750 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2751 2 : 1; 2752 iscsit_free_datain_req(cmd, dr); 2753 } 2754 2755 return eodr; 2756 } 2757 2758 int 2759 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2760 struct iscsi_logout_rsp *hdr) 2761 { 2762 struct iscsi_conn *logout_conn = NULL; 2763 struct iscsi_conn_recovery *cr = NULL; 2764 struct iscsi_session *sess = conn->sess; 2765 /* 2766 * The actual shutting down of Sessions and/or Connections 2767 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2768 * is done in scsi_logout_post_handler(). 2769 */ 2770 switch (cmd->logout_reason) { 2771 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2772 pr_debug("iSCSI session logout successful, setting" 2773 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2774 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2775 break; 2776 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2777 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2778 break; 2779 /* 2780 * For CLOSECONNECTION logout requests carrying 2781 * a matching logout CID -> local CID, the reference 2782 * for the local CID will have been incremented in 2783 * iscsi_logout_closeconnection(). 2784 * 2785 * For CLOSECONNECTION logout requests carrying 2786 * a different CID than the connection it arrived 2787 * on, the connection responding to cmd->logout_cid 2788 * is stopped in iscsit_logout_post_handler_diffcid(). 2789 */ 2790 2791 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2792 " successful.\n", cmd->logout_cid, conn->cid); 2793 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2794 break; 2795 case ISCSI_LOGOUT_REASON_RECOVERY: 2796 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2797 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2798 break; 2799 /* 2800 * If the connection is still active from our point of view 2801 * force connection recovery to occur. 2802 */ 2803 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2804 cmd->logout_cid); 2805 if (logout_conn) { 2806 iscsit_connection_reinstatement_rcfr(logout_conn); 2807 iscsit_dec_conn_usage_count(logout_conn); 2808 } 2809 2810 cr = iscsit_get_inactive_connection_recovery_entry( 2811 conn->sess, cmd->logout_cid); 2812 if (!cr) { 2813 pr_err("Unable to locate CID: %hu for" 2814 " REMOVECONNFORRECOVERY Logout Request.\n", 2815 cmd->logout_cid); 2816 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2817 break; 2818 } 2819 2820 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2821 2822 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2823 " for recovery for CID: %hu on CID: %hu successful.\n", 2824 cmd->logout_cid, conn->cid); 2825 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2826 break; 2827 default: 2828 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2829 cmd->logout_reason); 2830 return -1; 2831 } 2832 2833 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2834 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2835 hdr->response = cmd->logout_response; 2836 hdr->itt = cmd->init_task_tag; 2837 cmd->stat_sn = conn->stat_sn++; 2838 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2839 2840 iscsit_increment_maxcmdsn(cmd, conn->sess); 2841 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2842 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2843 2844 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2845 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2846 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2847 cmd->logout_cid, conn->cid); 2848 2849 return 0; 2850 } 2851 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2852 2853 static int 2854 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2855 { 2856 struct kvec *iov; 2857 int niov = 0, tx_size, rc; 2858 2859 rc = iscsit_build_logout_rsp(cmd, conn, 2860 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2861 if (rc < 0) 2862 return rc; 2863 2864 tx_size = ISCSI_HDR_LEN; 2865 iov = &cmd->iov_misc[0]; 2866 iov[niov].iov_base = cmd->pdu; 2867 iov[niov++].iov_len = ISCSI_HDR_LEN; 2868 2869 if (conn->conn_ops->HeaderDigest) { 2870 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2871 2872 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2873 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2874 2875 iov[0].iov_len += ISCSI_CRC_LEN; 2876 tx_size += ISCSI_CRC_LEN; 2877 pr_debug("Attaching CRC32C HeaderDigest to" 2878 " Logout Response 0x%08x\n", *header_digest); 2879 } 2880 cmd->iov_misc_count = niov; 2881 cmd->tx_size = tx_size; 2882 2883 return 0; 2884 } 2885 2886 void 2887 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2888 struct iscsi_nopin *hdr, bool nopout_response) 2889 { 2890 hdr->opcode = ISCSI_OP_NOOP_IN; 2891 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2892 hton24(hdr->dlength, cmd->buf_ptr_size); 2893 if (nopout_response) 2894 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2895 hdr->itt = cmd->init_task_tag; 2896 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2897 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2898 conn->stat_sn; 2899 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2900 2901 if (nopout_response) 2902 iscsit_increment_maxcmdsn(cmd, conn->sess); 2903 2904 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2905 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2906 2907 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2908 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2909 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2910 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2911 } 2912 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2913 2914 /* 2915 * Unsolicited NOPIN, either requesting a response or not. 2916 */ 2917 static int iscsit_send_unsolicited_nopin( 2918 struct iscsi_cmd *cmd, 2919 struct iscsi_conn *conn, 2920 int want_response) 2921 { 2922 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2923 int tx_size = ISCSI_HDR_LEN, ret; 2924 2925 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2926 2927 if (conn->conn_ops->HeaderDigest) { 2928 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2929 2930 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2931 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2932 2933 tx_size += ISCSI_CRC_LEN; 2934 pr_debug("Attaching CRC32C HeaderDigest to" 2935 " NopIN 0x%08x\n", *header_digest); 2936 } 2937 2938 cmd->iov_misc[0].iov_base = cmd->pdu; 2939 cmd->iov_misc[0].iov_len = tx_size; 2940 cmd->iov_misc_count = 1; 2941 cmd->tx_size = tx_size; 2942 2943 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2944 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2945 2946 ret = iscsit_send_tx_data(cmd, conn, 1); 2947 if (ret < 0) { 2948 iscsit_tx_thread_wait_for_tcp(conn); 2949 return ret; 2950 } 2951 2952 spin_lock_bh(&cmd->istate_lock); 2953 cmd->i_state = want_response ? 2954 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2955 spin_unlock_bh(&cmd->istate_lock); 2956 2957 return 0; 2958 } 2959 2960 static int 2961 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2962 { 2963 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2964 struct kvec *iov; 2965 u32 padding = 0; 2966 int niov = 0, tx_size; 2967 2968 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2969 2970 tx_size = ISCSI_HDR_LEN; 2971 iov = &cmd->iov_misc[0]; 2972 iov[niov].iov_base = cmd->pdu; 2973 iov[niov++].iov_len = ISCSI_HDR_LEN; 2974 2975 if (conn->conn_ops->HeaderDigest) { 2976 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2977 2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2979 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2980 2981 iov[0].iov_len += ISCSI_CRC_LEN; 2982 tx_size += ISCSI_CRC_LEN; 2983 pr_debug("Attaching CRC32C HeaderDigest" 2984 " to NopIn 0x%08x\n", *header_digest); 2985 } 2986 2987 /* 2988 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2989 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2990 */ 2991 if (cmd->buf_ptr_size) { 2992 iov[niov].iov_base = cmd->buf_ptr; 2993 iov[niov++].iov_len = cmd->buf_ptr_size; 2994 tx_size += cmd->buf_ptr_size; 2995 2996 pr_debug("Echoing back %u bytes of ping" 2997 " data.\n", cmd->buf_ptr_size); 2998 2999 padding = ((-cmd->buf_ptr_size) & 3); 3000 if (padding != 0) { 3001 iov[niov].iov_base = &cmd->pad_bytes; 3002 iov[niov++].iov_len = padding; 3003 tx_size += padding; 3004 pr_debug("Attaching %u additional" 3005 " padding bytes.\n", padding); 3006 } 3007 if (conn->conn_ops->DataDigest) { 3008 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3009 cmd->buf_ptr, cmd->buf_ptr_size, 3010 padding, (u8 *)&cmd->pad_bytes, 3011 (u8 *)&cmd->data_crc); 3012 3013 iov[niov].iov_base = &cmd->data_crc; 3014 iov[niov++].iov_len = ISCSI_CRC_LEN; 3015 tx_size += ISCSI_CRC_LEN; 3016 pr_debug("Attached DataDigest for %u" 3017 " bytes of ping data, CRC 0x%08x\n", 3018 cmd->buf_ptr_size, cmd->data_crc); 3019 } 3020 } 3021 3022 cmd->iov_misc_count = niov; 3023 cmd->tx_size = tx_size; 3024 3025 return 0; 3026 } 3027 3028 static int iscsit_send_r2t( 3029 struct iscsi_cmd *cmd, 3030 struct iscsi_conn *conn) 3031 { 3032 int tx_size = 0; 3033 struct iscsi_r2t *r2t; 3034 struct iscsi_r2t_rsp *hdr; 3035 int ret; 3036 3037 r2t = iscsit_get_r2t_from_list(cmd); 3038 if (!r2t) 3039 return -1; 3040 3041 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3042 memset(hdr, 0, ISCSI_HDR_LEN); 3043 hdr->opcode = ISCSI_OP_R2T; 3044 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3045 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3046 (struct scsi_lun *)&hdr->lun); 3047 hdr->itt = cmd->init_task_tag; 3048 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3049 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3050 hdr->statsn = cpu_to_be32(conn->stat_sn); 3051 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3052 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3053 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3054 hdr->data_offset = cpu_to_be32(r2t->offset); 3055 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3056 3057 cmd->iov_misc[0].iov_base = cmd->pdu; 3058 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3059 tx_size += ISCSI_HDR_LEN; 3060 3061 if (conn->conn_ops->HeaderDigest) { 3062 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3063 3064 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3065 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3066 3067 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3068 tx_size += ISCSI_CRC_LEN; 3069 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3070 " PDU 0x%08x\n", *header_digest); 3071 } 3072 3073 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3074 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3075 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3076 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3077 r2t->offset, r2t->xfer_len, conn->cid); 3078 3079 cmd->iov_misc_count = 1; 3080 cmd->tx_size = tx_size; 3081 3082 spin_lock_bh(&cmd->r2t_lock); 3083 r2t->sent_r2t = 1; 3084 spin_unlock_bh(&cmd->r2t_lock); 3085 3086 ret = iscsit_send_tx_data(cmd, conn, 1); 3087 if (ret < 0) { 3088 iscsit_tx_thread_wait_for_tcp(conn); 3089 return ret; 3090 } 3091 3092 spin_lock_bh(&cmd->dataout_timeout_lock); 3093 iscsit_start_dataout_timer(cmd, conn); 3094 spin_unlock_bh(&cmd->dataout_timeout_lock); 3095 3096 return 0; 3097 } 3098 3099 /* 3100 * @recovery: If called from iscsi_task_reassign_complete_write() for 3101 * connection recovery. 3102 */ 3103 int iscsit_build_r2ts_for_cmd( 3104 struct iscsi_conn *conn, 3105 struct iscsi_cmd *cmd, 3106 bool recovery) 3107 { 3108 int first_r2t = 1; 3109 u32 offset = 0, xfer_len = 0; 3110 3111 spin_lock_bh(&cmd->r2t_lock); 3112 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3113 spin_unlock_bh(&cmd->r2t_lock); 3114 return 0; 3115 } 3116 3117 if (conn->sess->sess_ops->DataSequenceInOrder && 3118 !recovery) 3119 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3120 3121 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3122 if (conn->sess->sess_ops->DataSequenceInOrder) { 3123 offset = cmd->r2t_offset; 3124 3125 if (first_r2t && recovery) { 3126 int new_data_end = offset + 3127 conn->sess->sess_ops->MaxBurstLength - 3128 cmd->next_burst_len; 3129 3130 if (new_data_end > cmd->se_cmd.data_length) 3131 xfer_len = cmd->se_cmd.data_length - offset; 3132 else 3133 xfer_len = 3134 conn->sess->sess_ops->MaxBurstLength - 3135 cmd->next_burst_len; 3136 } else { 3137 int new_data_end = offset + 3138 conn->sess->sess_ops->MaxBurstLength; 3139 3140 if (new_data_end > cmd->se_cmd.data_length) 3141 xfer_len = cmd->se_cmd.data_length - offset; 3142 else 3143 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3144 } 3145 cmd->r2t_offset += xfer_len; 3146 3147 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3148 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3149 } else { 3150 struct iscsi_seq *seq; 3151 3152 seq = iscsit_get_seq_holder_for_r2t(cmd); 3153 if (!seq) { 3154 spin_unlock_bh(&cmd->r2t_lock); 3155 return -1; 3156 } 3157 3158 offset = seq->offset; 3159 xfer_len = seq->xfer_len; 3160 3161 if (cmd->seq_send_order == cmd->seq_count) 3162 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3163 } 3164 cmd->outstanding_r2ts++; 3165 first_r2t = 0; 3166 3167 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3168 spin_unlock_bh(&cmd->r2t_lock); 3169 return -1; 3170 } 3171 3172 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3173 break; 3174 } 3175 spin_unlock_bh(&cmd->r2t_lock); 3176 3177 return 0; 3178 } 3179 3180 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3181 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3182 { 3183 if (inc_stat_sn) 3184 cmd->stat_sn = conn->stat_sn++; 3185 3186 atomic_long_inc(&conn->sess->rsp_pdus); 3187 3188 memset(hdr, 0, ISCSI_HDR_LEN); 3189 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3190 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3191 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3192 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3193 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3194 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3195 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3196 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3197 } 3198 hdr->response = cmd->iscsi_response; 3199 hdr->cmd_status = cmd->se_cmd.scsi_status; 3200 hdr->itt = cmd->init_task_tag; 3201 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3202 3203 iscsit_increment_maxcmdsn(cmd, conn->sess); 3204 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3205 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3206 3207 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3208 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3209 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3210 cmd->se_cmd.scsi_status, conn->cid); 3211 } 3212 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3213 3214 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3215 { 3216 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3217 struct kvec *iov; 3218 u32 padding = 0, tx_size = 0; 3219 int iov_count = 0; 3220 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3221 3222 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3223 3224 iov = &cmd->iov_misc[0]; 3225 iov[iov_count].iov_base = cmd->pdu; 3226 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3227 tx_size += ISCSI_HDR_LEN; 3228 3229 /* 3230 * Attach SENSE DATA payload to iSCSI Response PDU 3231 */ 3232 if (cmd->se_cmd.sense_buffer && 3233 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3234 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3235 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3236 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3237 3238 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3239 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3240 iov[iov_count].iov_base = cmd->sense_buffer; 3241 iov[iov_count++].iov_len = 3242 (cmd->se_cmd.scsi_sense_length + padding); 3243 tx_size += cmd->se_cmd.scsi_sense_length; 3244 3245 if (padding) { 3246 memset(cmd->sense_buffer + 3247 cmd->se_cmd.scsi_sense_length, 0, padding); 3248 tx_size += padding; 3249 pr_debug("Adding %u bytes of padding to" 3250 " SENSE.\n", padding); 3251 } 3252 3253 if (conn->conn_ops->DataDigest) { 3254 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3255 cmd->sense_buffer, 3256 (cmd->se_cmd.scsi_sense_length + padding), 3257 0, NULL, (u8 *)&cmd->data_crc); 3258 3259 iov[iov_count].iov_base = &cmd->data_crc; 3260 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3261 tx_size += ISCSI_CRC_LEN; 3262 3263 pr_debug("Attaching CRC32 DataDigest for" 3264 " SENSE, %u bytes CRC 0x%08x\n", 3265 (cmd->se_cmd.scsi_sense_length + padding), 3266 cmd->data_crc); 3267 } 3268 3269 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3270 " Response PDU\n", 3271 cmd->se_cmd.scsi_sense_length); 3272 } 3273 3274 if (conn->conn_ops->HeaderDigest) { 3275 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3276 3277 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3278 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3279 3280 iov[0].iov_len += ISCSI_CRC_LEN; 3281 tx_size += ISCSI_CRC_LEN; 3282 pr_debug("Attaching CRC32 HeaderDigest for Response" 3283 " PDU 0x%08x\n", *header_digest); 3284 } 3285 3286 cmd->iov_misc_count = iov_count; 3287 cmd->tx_size = tx_size; 3288 3289 return 0; 3290 } 3291 3292 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3293 { 3294 switch (se_tmr->response) { 3295 case TMR_FUNCTION_COMPLETE: 3296 return ISCSI_TMF_RSP_COMPLETE; 3297 case TMR_TASK_DOES_NOT_EXIST: 3298 return ISCSI_TMF_RSP_NO_TASK; 3299 case TMR_LUN_DOES_NOT_EXIST: 3300 return ISCSI_TMF_RSP_NO_LUN; 3301 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3302 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3303 case TMR_FUNCTION_REJECTED: 3304 default: 3305 return ISCSI_TMF_RSP_REJECTED; 3306 } 3307 } 3308 3309 void 3310 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3311 struct iscsi_tm_rsp *hdr) 3312 { 3313 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3314 3315 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3316 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3317 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3318 hdr->itt = cmd->init_task_tag; 3319 cmd->stat_sn = conn->stat_sn++; 3320 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3321 3322 iscsit_increment_maxcmdsn(cmd, conn->sess); 3323 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3324 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3325 3326 pr_debug("Built Task Management Response ITT: 0x%08x," 3327 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3328 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3329 } 3330 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3331 3332 static int 3333 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3334 { 3335 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3336 u32 tx_size = 0; 3337 3338 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3339 3340 cmd->iov_misc[0].iov_base = cmd->pdu; 3341 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3342 tx_size += ISCSI_HDR_LEN; 3343 3344 if (conn->conn_ops->HeaderDigest) { 3345 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3346 3347 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3348 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3349 3350 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3351 tx_size += ISCSI_CRC_LEN; 3352 pr_debug("Attaching CRC32 HeaderDigest for Task" 3353 " Mgmt Response PDU 0x%08x\n", *header_digest); 3354 } 3355 3356 cmd->iov_misc_count = 1; 3357 cmd->tx_size = tx_size; 3358 3359 return 0; 3360 } 3361 3362 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3363 { 3364 bool ret = false; 3365 3366 if (np->np_sockaddr.ss_family == AF_INET6) { 3367 const struct sockaddr_in6 sin6 = { 3368 .sin6_addr = IN6ADDR_ANY_INIT }; 3369 struct sockaddr_in6 *sock_in6 = 3370 (struct sockaddr_in6 *)&np->np_sockaddr; 3371 3372 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3373 sin6.sin6_addr.s6_addr, 16)) 3374 ret = true; 3375 } else { 3376 struct sockaddr_in * sock_in = 3377 (struct sockaddr_in *)&np->np_sockaddr; 3378 3379 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3380 ret = true; 3381 } 3382 3383 return ret; 3384 } 3385 3386 #define SENDTARGETS_BUF_LIMIT 32768U 3387 3388 static int 3389 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3390 enum iscsit_transport_type network_transport, 3391 int skip_bytes, bool *completed) 3392 { 3393 char *payload = NULL; 3394 struct iscsi_conn *conn = cmd->conn; 3395 struct iscsi_portal_group *tpg; 3396 struct iscsi_tiqn *tiqn; 3397 struct iscsi_tpg_np *tpg_np; 3398 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3399 int target_name_printed; 3400 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3401 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3402 3403 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3404 SENDTARGETS_BUF_LIMIT); 3405 3406 payload = kzalloc(buffer_len, GFP_KERNEL); 3407 if (!payload) { 3408 pr_err("Unable to allocate memory for sendtargets" 3409 " response.\n"); 3410 return -ENOMEM; 3411 } 3412 /* 3413 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3414 * explicit case.. 3415 */ 3416 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3417 text_ptr = strchr(text_in, '='); 3418 if (!text_ptr) { 3419 pr_err("Unable to locate '=' string in text_in:" 3420 " %s\n", text_in); 3421 kfree(payload); 3422 return -EINVAL; 3423 } 3424 /* 3425 * Skip over '=' character.. 3426 */ 3427 text_ptr += 1; 3428 } 3429 3430 spin_lock(&tiqn_lock); 3431 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3432 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3433 strcmp(tiqn->tiqn, text_ptr)) { 3434 continue; 3435 } 3436 3437 target_name_printed = 0; 3438 3439 spin_lock(&tiqn->tiqn_tpg_lock); 3440 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3441 3442 /* If demo_mode_discovery=0 and generate_node_acls=0 3443 * (demo mode dislabed) do not return 3444 * TargetName+TargetAddress unless a NodeACL exists. 3445 */ 3446 3447 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3448 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3449 (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg, 3450 cmd->conn->sess->sess_ops->InitiatorName))) { 3451 continue; 3452 } 3453 3454 spin_lock(&tpg->tpg_state_lock); 3455 if ((tpg->tpg_state == TPG_STATE_FREE) || 3456 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3457 spin_unlock(&tpg->tpg_state_lock); 3458 continue; 3459 } 3460 spin_unlock(&tpg->tpg_state_lock); 3461 3462 spin_lock(&tpg->tpg_np_lock); 3463 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3464 tpg_np_list) { 3465 struct iscsi_np *np = tpg_np->tpg_np; 3466 bool inaddr_any = iscsit_check_inaddr_any(np); 3467 char *fmt_str; 3468 3469 if (np->np_network_transport != network_transport) 3470 continue; 3471 3472 if (!target_name_printed) { 3473 len = sprintf(buf, "TargetName=%s", 3474 tiqn->tiqn); 3475 len += 1; 3476 3477 if ((len + payload_len) > buffer_len) { 3478 spin_unlock(&tpg->tpg_np_lock); 3479 spin_unlock(&tiqn->tiqn_tpg_lock); 3480 end_of_buf = 1; 3481 goto eob; 3482 } 3483 3484 if (skip_bytes && len <= skip_bytes) { 3485 skip_bytes -= len; 3486 } else { 3487 memcpy(payload + payload_len, buf, len); 3488 payload_len += len; 3489 target_name_printed = 1; 3490 if (len > skip_bytes) 3491 skip_bytes = 0; 3492 } 3493 } 3494 3495 if (np->np_sockaddr.ss_family == AF_INET6) 3496 fmt_str = "TargetAddress=[%s]:%hu,%hu"; 3497 else 3498 fmt_str = "TargetAddress=%s:%hu,%hu"; 3499 3500 len = sprintf(buf, fmt_str, 3501 inaddr_any ? conn->local_ip : np->np_ip, 3502 np->np_port, 3503 tpg->tpgt); 3504 len += 1; 3505 3506 if ((len + payload_len) > buffer_len) { 3507 spin_unlock(&tpg->tpg_np_lock); 3508 spin_unlock(&tiqn->tiqn_tpg_lock); 3509 end_of_buf = 1; 3510 goto eob; 3511 } 3512 3513 if (skip_bytes && len <= skip_bytes) { 3514 skip_bytes -= len; 3515 } else { 3516 memcpy(payload + payload_len, buf, len); 3517 payload_len += len; 3518 if (len > skip_bytes) 3519 skip_bytes = 0; 3520 } 3521 } 3522 spin_unlock(&tpg->tpg_np_lock); 3523 } 3524 spin_unlock(&tiqn->tiqn_tpg_lock); 3525 eob: 3526 if (end_of_buf) { 3527 *completed = false; 3528 break; 3529 } 3530 3531 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3532 break; 3533 } 3534 spin_unlock(&tiqn_lock); 3535 3536 cmd->buf_ptr = payload; 3537 3538 return payload_len; 3539 } 3540 3541 int 3542 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3543 struct iscsi_text_rsp *hdr, 3544 enum iscsit_transport_type network_transport) 3545 { 3546 int text_length, padding; 3547 bool completed = true; 3548 3549 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3550 cmd->read_data_done, 3551 &completed); 3552 if (text_length < 0) 3553 return text_length; 3554 3555 if (completed) { 3556 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3557 } else { 3558 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3559 cmd->read_data_done += text_length; 3560 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3561 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3562 } 3563 hdr->opcode = ISCSI_OP_TEXT_RSP; 3564 padding = ((-text_length) & 3); 3565 hton24(hdr->dlength, text_length); 3566 hdr->itt = cmd->init_task_tag; 3567 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3568 cmd->stat_sn = conn->stat_sn++; 3569 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3570 3571 iscsit_increment_maxcmdsn(cmd, conn->sess); 3572 /* 3573 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3574 * correctly increment MaxCmdSN for each response answering a 3575 * non immediate text request with a valid CmdSN. 3576 */ 3577 cmd->maxcmdsn_inc = 0; 3578 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3579 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3580 3581 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3582 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3583 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3584 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3585 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3586 3587 return text_length + padding; 3588 } 3589 EXPORT_SYMBOL(iscsit_build_text_rsp); 3590 3591 static int iscsit_send_text_rsp( 3592 struct iscsi_cmd *cmd, 3593 struct iscsi_conn *conn) 3594 { 3595 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3596 struct kvec *iov; 3597 u32 tx_size = 0; 3598 int text_length, iov_count = 0, rc; 3599 3600 rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP); 3601 if (rc < 0) 3602 return rc; 3603 3604 text_length = rc; 3605 iov = &cmd->iov_misc[0]; 3606 iov[iov_count].iov_base = cmd->pdu; 3607 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3608 iov[iov_count].iov_base = cmd->buf_ptr; 3609 iov[iov_count++].iov_len = text_length; 3610 3611 tx_size += (ISCSI_HDR_LEN + text_length); 3612 3613 if (conn->conn_ops->HeaderDigest) { 3614 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3615 3616 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3617 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3618 3619 iov[0].iov_len += ISCSI_CRC_LEN; 3620 tx_size += ISCSI_CRC_LEN; 3621 pr_debug("Attaching CRC32 HeaderDigest for" 3622 " Text Response PDU 0x%08x\n", *header_digest); 3623 } 3624 3625 if (conn->conn_ops->DataDigest) { 3626 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3627 cmd->buf_ptr, text_length, 3628 0, NULL, (u8 *)&cmd->data_crc); 3629 3630 iov[iov_count].iov_base = &cmd->data_crc; 3631 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3632 tx_size += ISCSI_CRC_LEN; 3633 3634 pr_debug("Attaching DataDigest for %u bytes of text" 3635 " data, CRC 0x%08x\n", text_length, 3636 cmd->data_crc); 3637 } 3638 3639 cmd->iov_misc_count = iov_count; 3640 cmd->tx_size = tx_size; 3641 3642 return 0; 3643 } 3644 3645 void 3646 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3647 struct iscsi_reject *hdr) 3648 { 3649 hdr->opcode = ISCSI_OP_REJECT; 3650 hdr->reason = cmd->reject_reason; 3651 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3652 hton24(hdr->dlength, ISCSI_HDR_LEN); 3653 hdr->ffffffff = cpu_to_be32(0xffffffff); 3654 cmd->stat_sn = conn->stat_sn++; 3655 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3656 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3657 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3658 3659 } 3660 EXPORT_SYMBOL(iscsit_build_reject); 3661 3662 static int iscsit_send_reject( 3663 struct iscsi_cmd *cmd, 3664 struct iscsi_conn *conn) 3665 { 3666 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3667 struct kvec *iov; 3668 u32 iov_count = 0, tx_size; 3669 3670 iscsit_build_reject(cmd, conn, hdr); 3671 3672 iov = &cmd->iov_misc[0]; 3673 iov[iov_count].iov_base = cmd->pdu; 3674 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3675 iov[iov_count].iov_base = cmd->buf_ptr; 3676 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3677 3678 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3679 3680 if (conn->conn_ops->HeaderDigest) { 3681 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3682 3683 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3684 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3685 3686 iov[0].iov_len += ISCSI_CRC_LEN; 3687 tx_size += ISCSI_CRC_LEN; 3688 pr_debug("Attaching CRC32 HeaderDigest for" 3689 " REJECT PDU 0x%08x\n", *header_digest); 3690 } 3691 3692 if (conn->conn_ops->DataDigest) { 3693 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3694 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3695 3696 iov[iov_count].iov_base = &cmd->data_crc; 3697 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3698 tx_size += ISCSI_CRC_LEN; 3699 pr_debug("Attaching CRC32 DataDigest for REJECT" 3700 " PDU 0x%08x\n", cmd->data_crc); 3701 } 3702 3703 cmd->iov_misc_count = iov_count; 3704 cmd->tx_size = tx_size; 3705 3706 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3707 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3708 3709 return 0; 3710 } 3711 3712 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3713 { 3714 int ord, cpu; 3715 /* 3716 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3717 * within iscsit_start_kthreads() 3718 * 3719 * Here we use bitmap_id to determine which CPU that this 3720 * iSCSI connection's RX/TX threads will be scheduled to 3721 * execute upon. 3722 */ 3723 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3724 for_each_online_cpu(cpu) { 3725 if (ord-- == 0) { 3726 cpumask_set_cpu(cpu, conn->conn_cpumask); 3727 return; 3728 } 3729 } 3730 /* 3731 * This should never be reached.. 3732 */ 3733 dump_stack(); 3734 cpumask_setall(conn->conn_cpumask); 3735 } 3736 3737 static inline void iscsit_thread_check_cpumask( 3738 struct iscsi_conn *conn, 3739 struct task_struct *p, 3740 int mode) 3741 { 3742 /* 3743 * mode == 1 signals iscsi_target_tx_thread() usage. 3744 * mode == 0 signals iscsi_target_rx_thread() usage. 3745 */ 3746 if (mode == 1) { 3747 if (!conn->conn_tx_reset_cpumask) 3748 return; 3749 conn->conn_tx_reset_cpumask = 0; 3750 } else { 3751 if (!conn->conn_rx_reset_cpumask) 3752 return; 3753 conn->conn_rx_reset_cpumask = 0; 3754 } 3755 /* 3756 * Update the CPU mask for this single kthread so that 3757 * both TX and RX kthreads are scheduled to run on the 3758 * same CPU. 3759 */ 3760 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3761 } 3762 3763 static int 3764 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3765 { 3766 int ret; 3767 3768 switch (state) { 3769 case ISTATE_SEND_R2T: 3770 ret = iscsit_send_r2t(cmd, conn); 3771 if (ret < 0) 3772 goto err; 3773 break; 3774 case ISTATE_REMOVE: 3775 spin_lock_bh(&conn->cmd_lock); 3776 list_del_init(&cmd->i_conn_node); 3777 spin_unlock_bh(&conn->cmd_lock); 3778 3779 iscsit_free_cmd(cmd, false); 3780 break; 3781 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3782 iscsit_mod_nopin_response_timer(conn); 3783 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3784 if (ret < 0) 3785 goto err; 3786 break; 3787 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3788 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3789 if (ret < 0) 3790 goto err; 3791 break; 3792 default: 3793 pr_err("Unknown Opcode: 0x%02x ITT:" 3794 " 0x%08x, i_state: %d on CID: %hu\n", 3795 cmd->iscsi_opcode, cmd->init_task_tag, state, 3796 conn->cid); 3797 goto err; 3798 } 3799 3800 return 0; 3801 3802 err: 3803 return -1; 3804 } 3805 3806 static int 3807 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3808 { 3809 struct iscsit_transport *t = conn->conn_transport; 3810 struct iscsi_queue_req *qr; 3811 struct iscsi_cmd *cmd; 3812 u8 state; 3813 int ret; 3814 3815 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3816 atomic_set(&conn->check_immediate_queue, 0); 3817 cmd = qr->cmd; 3818 state = qr->state; 3819 kmem_cache_free(lio_qr_cache, qr); 3820 3821 ret = t->iscsit_immediate_queue(conn, cmd, state); 3822 if (ret < 0) 3823 return ret; 3824 } 3825 3826 return 0; 3827 } 3828 3829 static int 3830 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3831 { 3832 int ret; 3833 3834 check_rsp_state: 3835 switch (state) { 3836 case ISTATE_SEND_DATAIN: 3837 ret = iscsit_send_datain(cmd, conn); 3838 if (ret < 0) 3839 goto err; 3840 else if (!ret) 3841 /* more drs */ 3842 goto check_rsp_state; 3843 else if (ret == 1) { 3844 /* all done */ 3845 spin_lock_bh(&cmd->istate_lock); 3846 cmd->i_state = ISTATE_SENT_STATUS; 3847 spin_unlock_bh(&cmd->istate_lock); 3848 3849 if (atomic_read(&conn->check_immediate_queue)) 3850 return 1; 3851 3852 return 0; 3853 } else if (ret == 2) { 3854 /* Still must send status, 3855 SCF_TRANSPORT_TASK_SENSE was set */ 3856 spin_lock_bh(&cmd->istate_lock); 3857 cmd->i_state = ISTATE_SEND_STATUS; 3858 spin_unlock_bh(&cmd->istate_lock); 3859 state = ISTATE_SEND_STATUS; 3860 goto check_rsp_state; 3861 } 3862 3863 break; 3864 case ISTATE_SEND_STATUS: 3865 case ISTATE_SEND_STATUS_RECOVERY: 3866 ret = iscsit_send_response(cmd, conn); 3867 break; 3868 case ISTATE_SEND_LOGOUTRSP: 3869 ret = iscsit_send_logout(cmd, conn); 3870 break; 3871 case ISTATE_SEND_ASYNCMSG: 3872 ret = iscsit_send_conn_drop_async_message( 3873 cmd, conn); 3874 break; 3875 case ISTATE_SEND_NOPIN: 3876 ret = iscsit_send_nopin(cmd, conn); 3877 break; 3878 case ISTATE_SEND_REJECT: 3879 ret = iscsit_send_reject(cmd, conn); 3880 break; 3881 case ISTATE_SEND_TASKMGTRSP: 3882 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3883 if (ret != 0) 3884 break; 3885 ret = iscsit_tmr_post_handler(cmd, conn); 3886 if (ret != 0) 3887 iscsit_fall_back_to_erl0(conn->sess); 3888 break; 3889 case ISTATE_SEND_TEXTRSP: 3890 ret = iscsit_send_text_rsp(cmd, conn); 3891 break; 3892 default: 3893 pr_err("Unknown Opcode: 0x%02x ITT:" 3894 " 0x%08x, i_state: %d on CID: %hu\n", 3895 cmd->iscsi_opcode, cmd->init_task_tag, 3896 state, conn->cid); 3897 goto err; 3898 } 3899 if (ret < 0) 3900 goto err; 3901 3902 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3903 iscsit_tx_thread_wait_for_tcp(conn); 3904 iscsit_unmap_iovec(cmd); 3905 goto err; 3906 } 3907 iscsit_unmap_iovec(cmd); 3908 3909 switch (state) { 3910 case ISTATE_SEND_LOGOUTRSP: 3911 if (!iscsit_logout_post_handler(cmd, conn)) 3912 return -ECONNRESET; 3913 /* fall through */ 3914 case ISTATE_SEND_STATUS: 3915 case ISTATE_SEND_ASYNCMSG: 3916 case ISTATE_SEND_NOPIN: 3917 case ISTATE_SEND_STATUS_RECOVERY: 3918 case ISTATE_SEND_TEXTRSP: 3919 case ISTATE_SEND_TASKMGTRSP: 3920 case ISTATE_SEND_REJECT: 3921 spin_lock_bh(&cmd->istate_lock); 3922 cmd->i_state = ISTATE_SENT_STATUS; 3923 spin_unlock_bh(&cmd->istate_lock); 3924 break; 3925 default: 3926 pr_err("Unknown Opcode: 0x%02x ITT:" 3927 " 0x%08x, i_state: %d on CID: %hu\n", 3928 cmd->iscsi_opcode, cmd->init_task_tag, 3929 cmd->i_state, conn->cid); 3930 goto err; 3931 } 3932 3933 if (atomic_read(&conn->check_immediate_queue)) 3934 return 1; 3935 3936 return 0; 3937 3938 err: 3939 return -1; 3940 } 3941 3942 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3943 { 3944 struct iscsit_transport *t = conn->conn_transport; 3945 struct iscsi_queue_req *qr; 3946 struct iscsi_cmd *cmd; 3947 u8 state; 3948 int ret; 3949 3950 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3951 cmd = qr->cmd; 3952 state = qr->state; 3953 kmem_cache_free(lio_qr_cache, qr); 3954 3955 ret = t->iscsit_response_queue(conn, cmd, state); 3956 if (ret == 1 || ret < 0) 3957 return ret; 3958 } 3959 3960 return 0; 3961 } 3962 3963 int iscsi_target_tx_thread(void *arg) 3964 { 3965 int ret = 0; 3966 struct iscsi_conn *conn = arg; 3967 /* 3968 * Allow ourselves to be interrupted by SIGINT so that a 3969 * connection recovery / failure event can be triggered externally. 3970 */ 3971 allow_signal(SIGINT); 3972 3973 while (!kthread_should_stop()) { 3974 /* 3975 * Ensure that both TX and RX per connection kthreads 3976 * are scheduled to run on the same CPU. 3977 */ 3978 iscsit_thread_check_cpumask(conn, current, 1); 3979 3980 wait_event_interruptible(conn->queues_wq, 3981 !iscsit_conn_all_queues_empty(conn)); 3982 3983 if (signal_pending(current)) 3984 goto transport_err; 3985 3986 get_immediate: 3987 ret = iscsit_handle_immediate_queue(conn); 3988 if (ret < 0) 3989 goto transport_err; 3990 3991 ret = iscsit_handle_response_queue(conn); 3992 if (ret == 1) 3993 goto get_immediate; 3994 else if (ret == -ECONNRESET) 3995 goto out; 3996 else if (ret < 0) 3997 goto transport_err; 3998 } 3999 4000 transport_err: 4001 iscsit_take_action_for_connection_exit(conn); 4002 out: 4003 return 0; 4004 } 4005 4006 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 4007 { 4008 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 4009 struct iscsi_cmd *cmd; 4010 int ret = 0; 4011 4012 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 4013 case ISCSI_OP_SCSI_CMD: 4014 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4015 if (!cmd) 4016 goto reject; 4017 4018 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 4019 break; 4020 case ISCSI_OP_SCSI_DATA_OUT: 4021 ret = iscsit_handle_data_out(conn, buf); 4022 break; 4023 case ISCSI_OP_NOOP_OUT: 4024 cmd = NULL; 4025 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 4026 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4027 if (!cmd) 4028 goto reject; 4029 } 4030 ret = iscsit_handle_nop_out(conn, cmd, buf); 4031 break; 4032 case ISCSI_OP_SCSI_TMFUNC: 4033 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4034 if (!cmd) 4035 goto reject; 4036 4037 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 4038 break; 4039 case ISCSI_OP_TEXT: 4040 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 4041 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 4042 if (!cmd) 4043 goto reject; 4044 } else { 4045 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4046 if (!cmd) 4047 goto reject; 4048 } 4049 4050 ret = iscsit_handle_text_cmd(conn, cmd, buf); 4051 break; 4052 case ISCSI_OP_LOGOUT: 4053 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4054 if (!cmd) 4055 goto reject; 4056 4057 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4058 if (ret > 0) 4059 wait_for_completion_timeout(&conn->conn_logout_comp, 4060 SECONDS_FOR_LOGOUT_COMP * HZ); 4061 break; 4062 case ISCSI_OP_SNACK: 4063 ret = iscsit_handle_snack(conn, buf); 4064 break; 4065 default: 4066 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4067 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4068 pr_err("Cannot recover from unknown" 4069 " opcode while ERL=0, closing iSCSI connection.\n"); 4070 return -1; 4071 } 4072 pr_err("Unable to recover from unknown opcode while OFMarker=No," 4073 " closing iSCSI connection.\n"); 4074 ret = -1; 4075 break; 4076 } 4077 4078 return ret; 4079 reject: 4080 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4081 } 4082 4083 int iscsi_target_rx_thread(void *arg) 4084 { 4085 int ret; 4086 u8 buffer[ISCSI_HDR_LEN], opcode; 4087 u32 checksum = 0, digest = 0; 4088 struct iscsi_conn *conn = arg; 4089 struct kvec iov; 4090 /* 4091 * Allow ourselves to be interrupted by SIGINT so that a 4092 * connection recovery / failure event can be triggered externally. 4093 */ 4094 allow_signal(SIGINT); 4095 4096 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4097 struct completion comp; 4098 int rc; 4099 4100 init_completion(&comp); 4101 rc = wait_for_completion_interruptible(&comp); 4102 if (rc < 0) 4103 goto transport_err; 4104 4105 goto transport_err; 4106 } 4107 4108 while (!kthread_should_stop()) { 4109 /* 4110 * Ensure that both TX and RX per connection kthreads 4111 * are scheduled to run on the same CPU. 4112 */ 4113 iscsit_thread_check_cpumask(conn, current, 0); 4114 4115 memset(buffer, 0, ISCSI_HDR_LEN); 4116 memset(&iov, 0, sizeof(struct kvec)); 4117 4118 iov.iov_base = buffer; 4119 iov.iov_len = ISCSI_HDR_LEN; 4120 4121 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4122 if (ret != ISCSI_HDR_LEN) { 4123 iscsit_rx_thread_wait_for_tcp(conn); 4124 goto transport_err; 4125 } 4126 4127 if (conn->conn_ops->HeaderDigest) { 4128 iov.iov_base = &digest; 4129 iov.iov_len = ISCSI_CRC_LEN; 4130 4131 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4132 if (ret != ISCSI_CRC_LEN) { 4133 iscsit_rx_thread_wait_for_tcp(conn); 4134 goto transport_err; 4135 } 4136 4137 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4138 buffer, ISCSI_HDR_LEN, 4139 0, NULL, (u8 *)&checksum); 4140 4141 if (digest != checksum) { 4142 pr_err("HeaderDigest CRC32C failed," 4143 " received 0x%08x, computed 0x%08x\n", 4144 digest, checksum); 4145 /* 4146 * Set the PDU to 0xff so it will intentionally 4147 * hit default in the switch below. 4148 */ 4149 memset(buffer, 0xff, ISCSI_HDR_LEN); 4150 atomic_long_inc(&conn->sess->conn_digest_errors); 4151 } else { 4152 pr_debug("Got HeaderDigest CRC32C" 4153 " 0x%08x\n", checksum); 4154 } 4155 } 4156 4157 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4158 goto transport_err; 4159 4160 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4161 4162 if (conn->sess->sess_ops->SessionType && 4163 ((!(opcode & ISCSI_OP_TEXT)) || 4164 (!(opcode & ISCSI_OP_LOGOUT)))) { 4165 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4166 " while in Discovery Session, rejecting.\n", opcode); 4167 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4168 buffer); 4169 goto transport_err; 4170 } 4171 4172 ret = iscsi_target_rx_opcode(conn, buffer); 4173 if (ret < 0) 4174 goto transport_err; 4175 } 4176 4177 transport_err: 4178 if (!signal_pending(current)) 4179 atomic_set(&conn->transport_failed, 1); 4180 iscsit_take_action_for_connection_exit(conn); 4181 return 0; 4182 } 4183 4184 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4185 { 4186 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4187 struct iscsi_session *sess = conn->sess; 4188 /* 4189 * We expect this function to only ever be called from either RX or TX 4190 * thread context via iscsit_close_connection() once the other context 4191 * has been reset -> returned sleeping pre-handler state. 4192 */ 4193 spin_lock_bh(&conn->cmd_lock); 4194 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4195 4196 list_del_init(&cmd->i_conn_node); 4197 spin_unlock_bh(&conn->cmd_lock); 4198 4199 iscsit_increment_maxcmdsn(cmd, sess); 4200 4201 iscsit_free_cmd(cmd, true); 4202 4203 spin_lock_bh(&conn->cmd_lock); 4204 } 4205 spin_unlock_bh(&conn->cmd_lock); 4206 } 4207 4208 static void iscsit_stop_timers_for_cmds( 4209 struct iscsi_conn *conn) 4210 { 4211 struct iscsi_cmd *cmd; 4212 4213 spin_lock_bh(&conn->cmd_lock); 4214 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4215 if (cmd->data_direction == DMA_TO_DEVICE) 4216 iscsit_stop_dataout_timer(cmd); 4217 } 4218 spin_unlock_bh(&conn->cmd_lock); 4219 } 4220 4221 int iscsit_close_connection( 4222 struct iscsi_conn *conn) 4223 { 4224 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4225 struct iscsi_session *sess = conn->sess; 4226 4227 pr_debug("Closing iSCSI connection CID %hu on SID:" 4228 " %u\n", conn->cid, sess->sid); 4229 /* 4230 * Always up conn_logout_comp for the traditional TCP case just in case 4231 * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout 4232 * response never got sent because the connection failed. 4233 * 4234 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4235 * to signal logout response TX interrupt completion. Go ahead and skip 4236 * this for iser since isert_rx_opcode() does not wait on logout failure, 4237 * and to avoid iscsi_conn pointer dereference in iser-target code. 4238 */ 4239 if (conn->conn_transport->transport_type == ISCSI_TCP) 4240 complete(&conn->conn_logout_comp); 4241 4242 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4243 if (conn->tx_thread && 4244 cmpxchg(&conn->tx_thread_active, true, false)) { 4245 send_sig(SIGINT, conn->tx_thread, 1); 4246 kthread_stop(conn->tx_thread); 4247 } 4248 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4249 if (conn->rx_thread && 4250 cmpxchg(&conn->rx_thread_active, true, false)) { 4251 send_sig(SIGINT, conn->rx_thread, 1); 4252 kthread_stop(conn->rx_thread); 4253 } 4254 } 4255 4256 spin_lock(&iscsit_global->ts_bitmap_lock); 4257 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4258 get_order(1)); 4259 spin_unlock(&iscsit_global->ts_bitmap_lock); 4260 4261 iscsit_stop_timers_for_cmds(conn); 4262 iscsit_stop_nopin_response_timer(conn); 4263 iscsit_stop_nopin_timer(conn); 4264 4265 if (conn->conn_transport->iscsit_wait_conn) 4266 conn->conn_transport->iscsit_wait_conn(conn); 4267 4268 /* 4269 * During Connection recovery drop unacknowledged out of order 4270 * commands for this connection, and prepare the other commands 4271 * for realligence. 4272 * 4273 * During normal operation clear the out of order commands (but 4274 * do not free the struct iscsi_ooo_cmdsn's) and release all 4275 * struct iscsi_cmds. 4276 */ 4277 if (atomic_read(&conn->connection_recovery)) { 4278 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4279 iscsit_prepare_cmds_for_realligance(conn); 4280 } else { 4281 iscsit_clear_ooo_cmdsns_for_conn(conn); 4282 iscsit_release_commands_from_conn(conn); 4283 } 4284 iscsit_free_queue_reqs_for_conn(conn); 4285 4286 /* 4287 * Handle decrementing session or connection usage count if 4288 * a logout response was not able to be sent because the 4289 * connection failed. Fall back to Session Recovery here. 4290 */ 4291 if (atomic_read(&conn->conn_logout_remove)) { 4292 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4293 iscsit_dec_conn_usage_count(conn); 4294 iscsit_dec_session_usage_count(sess); 4295 } 4296 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4297 iscsit_dec_conn_usage_count(conn); 4298 4299 atomic_set(&conn->conn_logout_remove, 0); 4300 atomic_set(&sess->session_reinstatement, 0); 4301 atomic_set(&sess->session_fall_back_to_erl0, 1); 4302 } 4303 4304 spin_lock_bh(&sess->conn_lock); 4305 list_del(&conn->conn_list); 4306 4307 /* 4308 * Attempt to let the Initiator know this connection failed by 4309 * sending an Connection Dropped Async Message on another 4310 * active connection. 4311 */ 4312 if (atomic_read(&conn->connection_recovery)) 4313 iscsit_build_conn_drop_async_message(conn); 4314 4315 spin_unlock_bh(&sess->conn_lock); 4316 4317 /* 4318 * If connection reinstatement is being performed on this connection, 4319 * up the connection reinstatement semaphore that is being blocked on 4320 * in iscsit_cause_connection_reinstatement(). 4321 */ 4322 spin_lock_bh(&conn->state_lock); 4323 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4324 spin_unlock_bh(&conn->state_lock); 4325 complete(&conn->conn_wait_comp); 4326 wait_for_completion(&conn->conn_post_wait_comp); 4327 spin_lock_bh(&conn->state_lock); 4328 } 4329 4330 /* 4331 * If connection reinstatement is being performed on this connection 4332 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4333 * connection wait rcfr semaphore that is being blocked on 4334 * an iscsit_connection_reinstatement_rcfr(). 4335 */ 4336 if (atomic_read(&conn->connection_wait_rcfr)) { 4337 spin_unlock_bh(&conn->state_lock); 4338 complete(&conn->conn_wait_rcfr_comp); 4339 wait_for_completion(&conn->conn_post_wait_comp); 4340 spin_lock_bh(&conn->state_lock); 4341 } 4342 atomic_set(&conn->connection_reinstatement, 1); 4343 spin_unlock_bh(&conn->state_lock); 4344 4345 /* 4346 * If any other processes are accessing this connection pointer we 4347 * must wait until they have completed. 4348 */ 4349 iscsit_check_conn_usage_count(conn); 4350 4351 if (conn->conn_rx_hash.tfm) 4352 crypto_free_hash(conn->conn_rx_hash.tfm); 4353 if (conn->conn_tx_hash.tfm) 4354 crypto_free_hash(conn->conn_tx_hash.tfm); 4355 4356 free_cpumask_var(conn->conn_cpumask); 4357 4358 kfree(conn->conn_ops); 4359 conn->conn_ops = NULL; 4360 4361 if (conn->sock) 4362 sock_release(conn->sock); 4363 4364 if (conn->conn_transport->iscsit_free_conn) 4365 conn->conn_transport->iscsit_free_conn(conn); 4366 4367 iscsit_put_transport(conn->conn_transport); 4368 4369 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4370 conn->conn_state = TARG_CONN_STATE_FREE; 4371 kfree(conn); 4372 4373 spin_lock_bh(&sess->conn_lock); 4374 atomic_dec(&sess->nconn); 4375 pr_debug("Decremented iSCSI connection count to %hu from node:" 4376 " %s\n", atomic_read(&sess->nconn), 4377 sess->sess_ops->InitiatorName); 4378 /* 4379 * Make sure that if one connection fails in an non ERL=2 iSCSI 4380 * Session that they all fail. 4381 */ 4382 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4383 !atomic_read(&sess->session_logout)) 4384 atomic_set(&sess->session_fall_back_to_erl0, 1); 4385 4386 /* 4387 * If this was not the last connection in the session, and we are 4388 * performing session reinstatement or falling back to ERL=0, call 4389 * iscsit_stop_session() without sleeping to shutdown the other 4390 * active connections. 4391 */ 4392 if (atomic_read(&sess->nconn)) { 4393 if (!atomic_read(&sess->session_reinstatement) && 4394 !atomic_read(&sess->session_fall_back_to_erl0)) { 4395 spin_unlock_bh(&sess->conn_lock); 4396 return 0; 4397 } 4398 if (!atomic_read(&sess->session_stop_active)) { 4399 atomic_set(&sess->session_stop_active, 1); 4400 spin_unlock_bh(&sess->conn_lock); 4401 iscsit_stop_session(sess, 0, 0); 4402 return 0; 4403 } 4404 spin_unlock_bh(&sess->conn_lock); 4405 return 0; 4406 } 4407 4408 /* 4409 * If this was the last connection in the session and one of the 4410 * following is occurring: 4411 * 4412 * Session Reinstatement is not being performed, and are falling back 4413 * to ERL=0 call iscsit_close_session(). 4414 * 4415 * Session Logout was requested. iscsit_close_session() will be called 4416 * elsewhere. 4417 * 4418 * Session Continuation is not being performed, start the Time2Retain 4419 * handler and check if sleep_on_sess_wait_sem is active. 4420 */ 4421 if (!atomic_read(&sess->session_reinstatement) && 4422 atomic_read(&sess->session_fall_back_to_erl0)) { 4423 spin_unlock_bh(&sess->conn_lock); 4424 target_put_session(sess->se_sess); 4425 4426 return 0; 4427 } else if (atomic_read(&sess->session_logout)) { 4428 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4429 sess->session_state = TARG_SESS_STATE_FREE; 4430 spin_unlock_bh(&sess->conn_lock); 4431 4432 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4433 complete(&sess->session_wait_comp); 4434 4435 return 0; 4436 } else { 4437 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4438 sess->session_state = TARG_SESS_STATE_FAILED; 4439 4440 if (!atomic_read(&sess->session_continuation)) { 4441 spin_unlock_bh(&sess->conn_lock); 4442 iscsit_start_time2retain_handler(sess); 4443 } else 4444 spin_unlock_bh(&sess->conn_lock); 4445 4446 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4447 complete(&sess->session_wait_comp); 4448 4449 return 0; 4450 } 4451 spin_unlock_bh(&sess->conn_lock); 4452 4453 return 0; 4454 } 4455 4456 int iscsit_close_session(struct iscsi_session *sess) 4457 { 4458 struct iscsi_portal_group *tpg = sess->tpg; 4459 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4460 4461 if (atomic_read(&sess->nconn)) { 4462 pr_err("%d connection(s) still exist for iSCSI session" 4463 " to %s\n", atomic_read(&sess->nconn), 4464 sess->sess_ops->InitiatorName); 4465 BUG(); 4466 } 4467 4468 spin_lock_bh(&se_tpg->session_lock); 4469 atomic_set(&sess->session_logout, 1); 4470 atomic_set(&sess->session_reinstatement, 1); 4471 iscsit_stop_time2retain_timer(sess); 4472 spin_unlock_bh(&se_tpg->session_lock); 4473 4474 /* 4475 * transport_deregister_session_configfs() will clear the 4476 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4477 * can be setting it again with __transport_register_session() in 4478 * iscsi_post_login_handler() again after the iscsit_stop_session() 4479 * completes in iscsi_np context. 4480 */ 4481 transport_deregister_session_configfs(sess->se_sess); 4482 4483 /* 4484 * If any other processes are accessing this session pointer we must 4485 * wait until they have completed. If we are in an interrupt (the 4486 * time2retain handler) and contain and active session usage count we 4487 * restart the timer and exit. 4488 */ 4489 if (!in_interrupt()) { 4490 if (iscsit_check_session_usage_count(sess) == 1) 4491 iscsit_stop_session(sess, 1, 1); 4492 } else { 4493 if (iscsit_check_session_usage_count(sess) == 2) { 4494 atomic_set(&sess->session_logout, 0); 4495 iscsit_start_time2retain_handler(sess); 4496 return 0; 4497 } 4498 } 4499 4500 transport_deregister_session(sess->se_sess); 4501 4502 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4503 iscsit_free_connection_recovery_entires(sess); 4504 4505 iscsit_free_all_ooo_cmdsns(sess); 4506 4507 spin_lock_bh(&se_tpg->session_lock); 4508 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4509 sess->session_state = TARG_SESS_STATE_FREE; 4510 pr_debug("Released iSCSI session from node: %s\n", 4511 sess->sess_ops->InitiatorName); 4512 tpg->nsessions--; 4513 if (tpg->tpg_tiqn) 4514 tpg->tpg_tiqn->tiqn_nsessions--; 4515 4516 pr_debug("Decremented number of active iSCSI Sessions on" 4517 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4518 4519 spin_lock(&sess_idr_lock); 4520 idr_remove(&sess_idr, sess->session_index); 4521 spin_unlock(&sess_idr_lock); 4522 4523 kfree(sess->sess_ops); 4524 sess->sess_ops = NULL; 4525 spin_unlock_bh(&se_tpg->session_lock); 4526 4527 kfree(sess); 4528 return 0; 4529 } 4530 4531 static void iscsit_logout_post_handler_closesession( 4532 struct iscsi_conn *conn) 4533 { 4534 struct iscsi_session *sess = conn->sess; 4535 int sleep = cmpxchg(&conn->tx_thread_active, true, false); 4536 4537 atomic_set(&conn->conn_logout_remove, 0); 4538 complete(&conn->conn_logout_comp); 4539 4540 iscsit_dec_conn_usage_count(conn); 4541 iscsit_stop_session(sess, sleep, sleep); 4542 iscsit_dec_session_usage_count(sess); 4543 target_put_session(sess->se_sess); 4544 } 4545 4546 static void iscsit_logout_post_handler_samecid( 4547 struct iscsi_conn *conn) 4548 { 4549 int sleep = cmpxchg(&conn->tx_thread_active, true, false); 4550 4551 atomic_set(&conn->conn_logout_remove, 0); 4552 complete(&conn->conn_logout_comp); 4553 4554 iscsit_cause_connection_reinstatement(conn, sleep); 4555 iscsit_dec_conn_usage_count(conn); 4556 } 4557 4558 static void iscsit_logout_post_handler_diffcid( 4559 struct iscsi_conn *conn, 4560 u16 cid) 4561 { 4562 struct iscsi_conn *l_conn; 4563 struct iscsi_session *sess = conn->sess; 4564 bool conn_found = false; 4565 4566 if (!sess) 4567 return; 4568 4569 spin_lock_bh(&sess->conn_lock); 4570 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4571 if (l_conn->cid == cid) { 4572 iscsit_inc_conn_usage_count(l_conn); 4573 conn_found = true; 4574 break; 4575 } 4576 } 4577 spin_unlock_bh(&sess->conn_lock); 4578 4579 if (!conn_found) 4580 return; 4581 4582 if (l_conn->sock) 4583 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4584 4585 spin_lock_bh(&l_conn->state_lock); 4586 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4587 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4588 spin_unlock_bh(&l_conn->state_lock); 4589 4590 iscsit_cause_connection_reinstatement(l_conn, 1); 4591 iscsit_dec_conn_usage_count(l_conn); 4592 } 4593 4594 /* 4595 * Return of 0 causes the TX thread to restart. 4596 */ 4597 int iscsit_logout_post_handler( 4598 struct iscsi_cmd *cmd, 4599 struct iscsi_conn *conn) 4600 { 4601 int ret = 0; 4602 4603 switch (cmd->logout_reason) { 4604 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4605 switch (cmd->logout_response) { 4606 case ISCSI_LOGOUT_SUCCESS: 4607 case ISCSI_LOGOUT_CLEANUP_FAILED: 4608 default: 4609 iscsit_logout_post_handler_closesession(conn); 4610 break; 4611 } 4612 ret = 0; 4613 break; 4614 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4615 if (conn->cid == cmd->logout_cid) { 4616 switch (cmd->logout_response) { 4617 case ISCSI_LOGOUT_SUCCESS: 4618 case ISCSI_LOGOUT_CLEANUP_FAILED: 4619 default: 4620 iscsit_logout_post_handler_samecid(conn); 4621 break; 4622 } 4623 ret = 0; 4624 } else { 4625 switch (cmd->logout_response) { 4626 case ISCSI_LOGOUT_SUCCESS: 4627 iscsit_logout_post_handler_diffcid(conn, 4628 cmd->logout_cid); 4629 break; 4630 case ISCSI_LOGOUT_CID_NOT_FOUND: 4631 case ISCSI_LOGOUT_CLEANUP_FAILED: 4632 default: 4633 break; 4634 } 4635 ret = 1; 4636 } 4637 break; 4638 case ISCSI_LOGOUT_REASON_RECOVERY: 4639 switch (cmd->logout_response) { 4640 case ISCSI_LOGOUT_SUCCESS: 4641 case ISCSI_LOGOUT_CID_NOT_FOUND: 4642 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4643 case ISCSI_LOGOUT_CLEANUP_FAILED: 4644 default: 4645 break; 4646 } 4647 ret = 1; 4648 break; 4649 default: 4650 break; 4651 4652 } 4653 return ret; 4654 } 4655 EXPORT_SYMBOL(iscsit_logout_post_handler); 4656 4657 void iscsit_fail_session(struct iscsi_session *sess) 4658 { 4659 struct iscsi_conn *conn; 4660 4661 spin_lock_bh(&sess->conn_lock); 4662 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4663 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4664 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4665 } 4666 spin_unlock_bh(&sess->conn_lock); 4667 4668 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4669 sess->session_state = TARG_SESS_STATE_FAILED; 4670 } 4671 4672 int iscsit_free_session(struct iscsi_session *sess) 4673 { 4674 u16 conn_count = atomic_read(&sess->nconn); 4675 struct iscsi_conn *conn, *conn_tmp = NULL; 4676 int is_last; 4677 4678 spin_lock_bh(&sess->conn_lock); 4679 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4680 4681 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4682 conn_list) { 4683 if (conn_count == 0) 4684 break; 4685 4686 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4687 is_last = 1; 4688 } else { 4689 iscsit_inc_conn_usage_count(conn_tmp); 4690 is_last = 0; 4691 } 4692 iscsit_inc_conn_usage_count(conn); 4693 4694 spin_unlock_bh(&sess->conn_lock); 4695 iscsit_cause_connection_reinstatement(conn, 1); 4696 spin_lock_bh(&sess->conn_lock); 4697 4698 iscsit_dec_conn_usage_count(conn); 4699 if (is_last == 0) 4700 iscsit_dec_conn_usage_count(conn_tmp); 4701 4702 conn_count--; 4703 } 4704 4705 if (atomic_read(&sess->nconn)) { 4706 spin_unlock_bh(&sess->conn_lock); 4707 wait_for_completion(&sess->session_wait_comp); 4708 } else 4709 spin_unlock_bh(&sess->conn_lock); 4710 4711 target_put_session(sess->se_sess); 4712 return 0; 4713 } 4714 4715 void iscsit_stop_session( 4716 struct iscsi_session *sess, 4717 int session_sleep, 4718 int connection_sleep) 4719 { 4720 u16 conn_count = atomic_read(&sess->nconn); 4721 struct iscsi_conn *conn, *conn_tmp = NULL; 4722 int is_last; 4723 4724 spin_lock_bh(&sess->conn_lock); 4725 if (session_sleep) 4726 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4727 4728 if (connection_sleep) { 4729 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4730 conn_list) { 4731 if (conn_count == 0) 4732 break; 4733 4734 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4735 is_last = 1; 4736 } else { 4737 iscsit_inc_conn_usage_count(conn_tmp); 4738 is_last = 0; 4739 } 4740 iscsit_inc_conn_usage_count(conn); 4741 4742 spin_unlock_bh(&sess->conn_lock); 4743 iscsit_cause_connection_reinstatement(conn, 1); 4744 spin_lock_bh(&sess->conn_lock); 4745 4746 iscsit_dec_conn_usage_count(conn); 4747 if (is_last == 0) 4748 iscsit_dec_conn_usage_count(conn_tmp); 4749 conn_count--; 4750 } 4751 } else { 4752 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4753 iscsit_cause_connection_reinstatement(conn, 0); 4754 } 4755 4756 if (session_sleep && atomic_read(&sess->nconn)) { 4757 spin_unlock_bh(&sess->conn_lock); 4758 wait_for_completion(&sess->session_wait_comp); 4759 } else 4760 spin_unlock_bh(&sess->conn_lock); 4761 } 4762 4763 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4764 { 4765 struct iscsi_session *sess; 4766 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4767 struct se_session *se_sess, *se_sess_tmp; 4768 int session_count = 0; 4769 4770 spin_lock_bh(&se_tpg->session_lock); 4771 if (tpg->nsessions && !force) { 4772 spin_unlock_bh(&se_tpg->session_lock); 4773 return -1; 4774 } 4775 4776 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4777 sess_list) { 4778 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4779 4780 spin_lock(&sess->conn_lock); 4781 if (atomic_read(&sess->session_fall_back_to_erl0) || 4782 atomic_read(&sess->session_logout) || 4783 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4784 spin_unlock(&sess->conn_lock); 4785 continue; 4786 } 4787 atomic_set(&sess->session_reinstatement, 1); 4788 spin_unlock(&sess->conn_lock); 4789 spin_unlock_bh(&se_tpg->session_lock); 4790 4791 iscsit_free_session(sess); 4792 spin_lock_bh(&se_tpg->session_lock); 4793 4794 session_count++; 4795 } 4796 spin_unlock_bh(&se_tpg->session_lock); 4797 4798 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4799 " Group: %hu\n", session_count, tpg->tpgt); 4800 return 0; 4801 } 4802 4803 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4804 MODULE_VERSION("4.1.x"); 4805 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4806 MODULE_LICENSE("GPL"); 4807 4808 module_init(iscsi_target_init_module); 4809 module_exit(iscsi_target_cleanup_module); 4810