1 /******************************************************************************* 2 * This file contains main functions related to the iSCSI Target Core Driver. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21 #include <linux/string.h> 22 #include <linux/kthread.h> 23 #include <linux/crypto.h> 24 #include <linux/completion.h> 25 #include <linux/module.h> 26 #include <linux/idr.h> 27 #include <asm/unaligned.h> 28 #include <scsi/scsi_device.h> 29 #include <scsi/iscsi_proto.h> 30 #include <scsi/scsi_tcq.h> 31 #include <target/target_core_base.h> 32 #include <target/target_core_fabric.h> 33 #include <target/target_core_configfs.h> 34 35 #include "iscsi_target_core.h" 36 #include "iscsi_target_parameters.h" 37 #include "iscsi_target_seq_pdu_list.h" 38 #include "iscsi_target_tq.h" 39 #include "iscsi_target_configfs.h" 40 #include "iscsi_target_datain_values.h" 41 #include "iscsi_target_erl0.h" 42 #include "iscsi_target_erl1.h" 43 #include "iscsi_target_erl2.h" 44 #include "iscsi_target_login.h" 45 #include "iscsi_target_tmr.h" 46 #include "iscsi_target_tpg.h" 47 #include "iscsi_target_util.h" 48 #include "iscsi_target.h" 49 #include "iscsi_target_device.h" 50 #include "iscsi_target_stat.h" 51 52 static LIST_HEAD(g_tiqn_list); 53 static LIST_HEAD(g_np_list); 54 static DEFINE_SPINLOCK(tiqn_lock); 55 static DEFINE_SPINLOCK(np_lock); 56 57 static struct idr tiqn_idr; 58 struct idr sess_idr; 59 struct mutex auth_id_lock; 60 spinlock_t sess_idr_lock; 61 62 struct iscsit_global *iscsit_global; 63 64 struct kmem_cache *lio_cmd_cache; 65 struct kmem_cache *lio_qr_cache; 66 struct kmem_cache *lio_dr_cache; 67 struct kmem_cache *lio_ooo_cache; 68 struct kmem_cache *lio_r2t_cache; 69 70 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 71 unsigned char *buf, u32); 72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *); 73 74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 75 { 76 struct iscsi_tiqn *tiqn = NULL; 77 78 spin_lock(&tiqn_lock); 79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 80 if (!strcmp(tiqn->tiqn, buf)) { 81 82 spin_lock(&tiqn->tiqn_state_lock); 83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 84 tiqn->tiqn_access_count++; 85 spin_unlock(&tiqn->tiqn_state_lock); 86 spin_unlock(&tiqn_lock); 87 return tiqn; 88 } 89 spin_unlock(&tiqn->tiqn_state_lock); 90 } 91 } 92 spin_unlock(&tiqn_lock); 93 94 return NULL; 95 } 96 97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 98 { 99 spin_lock(&tiqn->tiqn_state_lock); 100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 102 spin_unlock(&tiqn->tiqn_state_lock); 103 return 0; 104 } 105 spin_unlock(&tiqn->tiqn_state_lock); 106 107 return -1; 108 } 109 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 111 { 112 spin_lock(&tiqn->tiqn_state_lock); 113 tiqn->tiqn_access_count--; 114 spin_unlock(&tiqn->tiqn_state_lock); 115 } 116 117 /* 118 * Note that IQN formatting is expected to be done in userspace, and 119 * no explict IQN format checks are done here. 120 */ 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 122 { 123 struct iscsi_tiqn *tiqn = NULL; 124 int ret; 125 126 if (strlen(buf) >= ISCSI_IQN_LEN) { 127 pr_err("Target IQN exceeds %d bytes\n", 128 ISCSI_IQN_LEN); 129 return ERR_PTR(-EINVAL); 130 } 131 132 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 133 if (!tiqn) { 134 pr_err("Unable to allocate struct iscsi_tiqn\n"); 135 return ERR_PTR(-ENOMEM); 136 } 137 138 sprintf(tiqn->tiqn, "%s", buf); 139 INIT_LIST_HEAD(&tiqn->tiqn_list); 140 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 141 spin_lock_init(&tiqn->tiqn_state_lock); 142 spin_lock_init(&tiqn->tiqn_tpg_lock); 143 spin_lock_init(&tiqn->sess_err_stats.lock); 144 spin_lock_init(&tiqn->login_stats.lock); 145 spin_lock_init(&tiqn->logout_stats.lock); 146 147 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 148 149 idr_preload(GFP_KERNEL); 150 spin_lock(&tiqn_lock); 151 152 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 153 if (ret < 0) { 154 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 155 spin_unlock(&tiqn_lock); 156 idr_preload_end(); 157 kfree(tiqn); 158 return ERR_PTR(ret); 159 } 160 tiqn->tiqn_index = ret; 161 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 162 163 spin_unlock(&tiqn_lock); 164 idr_preload_end(); 165 166 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 167 168 return tiqn; 169 170 } 171 172 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 173 { 174 /* 175 * Wait for accesses to said struct iscsi_tiqn to end. 176 */ 177 spin_lock(&tiqn->tiqn_state_lock); 178 while (tiqn->tiqn_access_count != 0) { 179 spin_unlock(&tiqn->tiqn_state_lock); 180 msleep(10); 181 spin_lock(&tiqn->tiqn_state_lock); 182 } 183 spin_unlock(&tiqn->tiqn_state_lock); 184 } 185 186 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 187 { 188 /* 189 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 190 * while holding tiqn->tiqn_state_lock. This means that all subsequent 191 * attempts to access this struct iscsi_tiqn will fail from both transport 192 * fabric and control code paths. 193 */ 194 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 195 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 196 return; 197 } 198 199 iscsit_wait_for_tiqn(tiqn); 200 201 spin_lock(&tiqn_lock); 202 list_del(&tiqn->tiqn_list); 203 idr_remove(&tiqn_idr, tiqn->tiqn_index); 204 spin_unlock(&tiqn_lock); 205 206 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 207 tiqn->tiqn); 208 kfree(tiqn); 209 } 210 211 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 212 { 213 int ret; 214 /* 215 * Determine if the network portal is accepting storage traffic. 216 */ 217 spin_lock_bh(&np->np_thread_lock); 218 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 219 spin_unlock_bh(&np->np_thread_lock); 220 return -1; 221 } 222 if (np->np_login_tpg) { 223 pr_err("np->np_login_tpg() is not NULL!\n"); 224 spin_unlock_bh(&np->np_thread_lock); 225 return -1; 226 } 227 spin_unlock_bh(&np->np_thread_lock); 228 /* 229 * Determine if the portal group is accepting storage traffic. 230 */ 231 spin_lock_bh(&tpg->tpg_state_lock); 232 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 233 spin_unlock_bh(&tpg->tpg_state_lock); 234 return -1; 235 } 236 spin_unlock_bh(&tpg->tpg_state_lock); 237 238 /* 239 * Here we serialize access across the TIQN+TPG Tuple. 240 */ 241 ret = mutex_lock_interruptible(&tpg->np_login_lock); 242 if ((ret != 0) || signal_pending(current)) 243 return -1; 244 245 spin_lock_bh(&np->np_thread_lock); 246 np->np_login_tpg = tpg; 247 spin_unlock_bh(&np->np_thread_lock); 248 249 return 0; 250 } 251 252 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 253 { 254 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 255 256 spin_lock_bh(&np->np_thread_lock); 257 np->np_login_tpg = NULL; 258 spin_unlock_bh(&np->np_thread_lock); 259 260 mutex_unlock(&tpg->np_login_lock); 261 262 if (tiqn) 263 iscsit_put_tiqn_for_login(tiqn); 264 265 return 0; 266 } 267 268 bool iscsit_check_np_match( 269 struct __kernel_sockaddr_storage *sockaddr, 270 struct iscsi_np *np, 271 int network_transport) 272 { 273 struct sockaddr_in *sock_in, *sock_in_e; 274 struct sockaddr_in6 *sock_in6, *sock_in6_e; 275 bool ip_match = false; 276 u16 port; 277 278 if (sockaddr->ss_family == AF_INET6) { 279 sock_in6 = (struct sockaddr_in6 *)sockaddr; 280 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 281 282 if (!memcmp(&sock_in6->sin6_addr.in6_u, 283 &sock_in6_e->sin6_addr.in6_u, 284 sizeof(struct in6_addr))) 285 ip_match = true; 286 287 port = ntohs(sock_in6->sin6_port); 288 } else { 289 sock_in = (struct sockaddr_in *)sockaddr; 290 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 291 292 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 293 ip_match = true; 294 295 port = ntohs(sock_in->sin_port); 296 } 297 298 if ((ip_match == true) && (np->np_port == port) && 299 (np->np_network_transport == network_transport)) 300 return true; 301 302 return false; 303 } 304 305 static struct iscsi_np *iscsit_get_np( 306 struct __kernel_sockaddr_storage *sockaddr, 307 int network_transport) 308 { 309 struct iscsi_np *np; 310 bool match; 311 312 spin_lock_bh(&np_lock); 313 list_for_each_entry(np, &g_np_list, np_list) { 314 spin_lock(&np->np_thread_lock); 315 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 316 spin_unlock(&np->np_thread_lock); 317 continue; 318 } 319 320 match = iscsit_check_np_match(sockaddr, np, network_transport); 321 if (match == true) { 322 /* 323 * Increment the np_exports reference count now to 324 * prevent iscsit_del_np() below from being called 325 * while iscsi_tpg_add_network_portal() is called. 326 */ 327 np->np_exports++; 328 spin_unlock(&np->np_thread_lock); 329 spin_unlock_bh(&np_lock); 330 return np; 331 } 332 spin_unlock(&np->np_thread_lock); 333 } 334 spin_unlock_bh(&np_lock); 335 336 return NULL; 337 } 338 339 struct iscsi_np *iscsit_add_np( 340 struct __kernel_sockaddr_storage *sockaddr, 341 char *ip_str, 342 int network_transport) 343 { 344 struct sockaddr_in *sock_in; 345 struct sockaddr_in6 *sock_in6; 346 struct iscsi_np *np; 347 int ret; 348 /* 349 * Locate the existing struct iscsi_np if already active.. 350 */ 351 np = iscsit_get_np(sockaddr, network_transport); 352 if (np) 353 return np; 354 355 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 356 if (!np) { 357 pr_err("Unable to allocate memory for struct iscsi_np\n"); 358 return ERR_PTR(-ENOMEM); 359 } 360 361 np->np_flags |= NPF_IP_NETWORK; 362 if (sockaddr->ss_family == AF_INET6) { 363 sock_in6 = (struct sockaddr_in6 *)sockaddr; 364 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 365 np->np_port = ntohs(sock_in6->sin6_port); 366 } else { 367 sock_in = (struct sockaddr_in *)sockaddr; 368 sprintf(np->np_ip, "%s", ip_str); 369 np->np_port = ntohs(sock_in->sin_port); 370 } 371 372 np->np_network_transport = network_transport; 373 spin_lock_init(&np->np_thread_lock); 374 init_completion(&np->np_restart_comp); 375 INIT_LIST_HEAD(&np->np_list); 376 377 ret = iscsi_target_setup_login_socket(np, sockaddr); 378 if (ret != 0) { 379 kfree(np); 380 return ERR_PTR(ret); 381 } 382 383 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 384 if (IS_ERR(np->np_thread)) { 385 pr_err("Unable to create kthread: iscsi_np\n"); 386 ret = PTR_ERR(np->np_thread); 387 kfree(np); 388 return ERR_PTR(ret); 389 } 390 /* 391 * Increment the np_exports reference count now to prevent 392 * iscsit_del_np() below from being run while a new call to 393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 394 * active. We don't need to hold np->np_thread_lock at this 395 * point because iscsi_np has not been added to g_np_list yet. 396 */ 397 np->np_exports = 1; 398 399 spin_lock_bh(&np_lock); 400 list_add_tail(&np->np_list, &g_np_list); 401 spin_unlock_bh(&np_lock); 402 403 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 404 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? 405 "TCP" : "SCTP"); 406 407 return np; 408 } 409 410 int iscsit_reset_np_thread( 411 struct iscsi_np *np, 412 struct iscsi_tpg_np *tpg_np, 413 struct iscsi_portal_group *tpg) 414 { 415 spin_lock_bh(&np->np_thread_lock); 416 if (tpg && tpg_np) { 417 /* 418 * The reset operation need only be performed when the 419 * passed struct iscsi_portal_group has a login in progress 420 * to one of the network portals. 421 */ 422 if (tpg_np->tpg_np->np_login_tpg != tpg) { 423 spin_unlock_bh(&np->np_thread_lock); 424 return 0; 425 } 426 } 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 return 0; 442 } 443 444 static int iscsit_del_np_comm(struct iscsi_np *np) 445 { 446 if (np->np_socket) 447 sock_release(np->np_socket); 448 return 0; 449 } 450 451 int iscsit_del_np(struct iscsi_np *np) 452 { 453 spin_lock_bh(&np->np_thread_lock); 454 np->np_exports--; 455 if (np->np_exports) { 456 spin_unlock_bh(&np->np_thread_lock); 457 return 0; 458 } 459 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 460 spin_unlock_bh(&np->np_thread_lock); 461 462 if (np->np_thread) { 463 /* 464 * We need to send the signal to wakeup Linux/Net 465 * which may be sleeping in sock_accept().. 466 */ 467 send_sig(SIGINT, np->np_thread, 1); 468 kthread_stop(np->np_thread); 469 } 470 iscsit_del_np_comm(np); 471 472 spin_lock_bh(&np_lock); 473 list_del(&np->np_list); 474 spin_unlock_bh(&np_lock); 475 476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 477 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? 478 "TCP" : "SCTP"); 479 480 kfree(np); 481 return 0; 482 } 483 484 static int __init iscsi_target_init_module(void) 485 { 486 int ret = 0; 487 488 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 489 490 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 491 if (!iscsit_global) { 492 pr_err("Unable to allocate memory for iscsit_global\n"); 493 return -1; 494 } 495 mutex_init(&auth_id_lock); 496 spin_lock_init(&sess_idr_lock); 497 idr_init(&tiqn_idr); 498 idr_init(&sess_idr); 499 500 ret = iscsi_target_register_configfs(); 501 if (ret < 0) 502 goto out; 503 504 ret = iscsi_thread_set_init(); 505 if (ret < 0) 506 goto configfs_out; 507 508 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 509 TARGET_THREAD_SET_COUNT) { 510 pr_err("iscsi_allocate_thread_sets() returned" 511 " unexpected value!\n"); 512 goto ts_out1; 513 } 514 515 lio_cmd_cache = kmem_cache_create("lio_cmd_cache", 516 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd), 517 0, NULL); 518 if (!lio_cmd_cache) { 519 pr_err("Unable to kmem_cache_create() for" 520 " lio_cmd_cache\n"); 521 goto ts_out2; 522 } 523 524 lio_qr_cache = kmem_cache_create("lio_qr_cache", 525 sizeof(struct iscsi_queue_req), 526 __alignof__(struct iscsi_queue_req), 0, NULL); 527 if (!lio_qr_cache) { 528 pr_err("nable to kmem_cache_create() for" 529 " lio_qr_cache\n"); 530 goto cmd_out; 531 } 532 533 lio_dr_cache = kmem_cache_create("lio_dr_cache", 534 sizeof(struct iscsi_datain_req), 535 __alignof__(struct iscsi_datain_req), 0, NULL); 536 if (!lio_dr_cache) { 537 pr_err("Unable to kmem_cache_create() for" 538 " lio_dr_cache\n"); 539 goto qr_out; 540 } 541 542 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 543 sizeof(struct iscsi_ooo_cmdsn), 544 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 545 if (!lio_ooo_cache) { 546 pr_err("Unable to kmem_cache_create() for" 547 " lio_ooo_cache\n"); 548 goto dr_out; 549 } 550 551 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 552 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 553 0, NULL); 554 if (!lio_r2t_cache) { 555 pr_err("Unable to kmem_cache_create() for" 556 " lio_r2t_cache\n"); 557 goto ooo_out; 558 } 559 560 if (iscsit_load_discovery_tpg() < 0) 561 goto r2t_out; 562 563 return ret; 564 r2t_out: 565 kmem_cache_destroy(lio_r2t_cache); 566 ooo_out: 567 kmem_cache_destroy(lio_ooo_cache); 568 dr_out: 569 kmem_cache_destroy(lio_dr_cache); 570 qr_out: 571 kmem_cache_destroy(lio_qr_cache); 572 cmd_out: 573 kmem_cache_destroy(lio_cmd_cache); 574 ts_out2: 575 iscsi_deallocate_thread_sets(); 576 ts_out1: 577 iscsi_thread_set_free(); 578 configfs_out: 579 iscsi_target_deregister_configfs(); 580 out: 581 kfree(iscsit_global); 582 return -ENOMEM; 583 } 584 585 static void __exit iscsi_target_cleanup_module(void) 586 { 587 iscsi_deallocate_thread_sets(); 588 iscsi_thread_set_free(); 589 iscsit_release_discovery_tpg(); 590 kmem_cache_destroy(lio_cmd_cache); 591 kmem_cache_destroy(lio_qr_cache); 592 kmem_cache_destroy(lio_dr_cache); 593 kmem_cache_destroy(lio_ooo_cache); 594 kmem_cache_destroy(lio_r2t_cache); 595 596 iscsi_target_deregister_configfs(); 597 598 kfree(iscsit_global); 599 } 600 601 static int iscsit_add_reject( 602 u8 reason, 603 int fail_conn, 604 unsigned char *buf, 605 struct iscsi_conn *conn) 606 { 607 struct iscsi_cmd *cmd; 608 struct iscsi_reject *hdr; 609 int ret; 610 611 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 612 if (!cmd) 613 return -1; 614 615 cmd->iscsi_opcode = ISCSI_OP_REJECT; 616 if (fail_conn) 617 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 618 619 hdr = (struct iscsi_reject *) cmd->pdu; 620 hdr->reason = reason; 621 622 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 623 if (!cmd->buf_ptr) { 624 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 625 iscsit_release_cmd(cmd); 626 return -1; 627 } 628 629 spin_lock_bh(&conn->cmd_lock); 630 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 631 spin_unlock_bh(&conn->cmd_lock); 632 633 cmd->i_state = ISTATE_SEND_REJECT; 634 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 635 636 ret = wait_for_completion_interruptible(&cmd->reject_comp); 637 if (ret != 0) 638 return -1; 639 640 return (!fail_conn) ? 0 : -1; 641 } 642 643 int iscsit_add_reject_from_cmd( 644 u8 reason, 645 int fail_conn, 646 int add_to_conn, 647 unsigned char *buf, 648 struct iscsi_cmd *cmd) 649 { 650 struct iscsi_conn *conn; 651 struct iscsi_reject *hdr; 652 int ret; 653 654 if (!cmd->conn) { 655 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 656 cmd->init_task_tag); 657 return -1; 658 } 659 conn = cmd->conn; 660 661 cmd->iscsi_opcode = ISCSI_OP_REJECT; 662 if (fail_conn) 663 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 664 665 hdr = (struct iscsi_reject *) cmd->pdu; 666 hdr->reason = reason; 667 668 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 669 if (!cmd->buf_ptr) { 670 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 671 iscsit_release_cmd(cmd); 672 return -1; 673 } 674 675 if (add_to_conn) { 676 spin_lock_bh(&conn->cmd_lock); 677 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 678 spin_unlock_bh(&conn->cmd_lock); 679 } 680 681 cmd->i_state = ISTATE_SEND_REJECT; 682 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 683 684 ret = wait_for_completion_interruptible(&cmd->reject_comp); 685 if (ret != 0) 686 return -1; 687 688 return (!fail_conn) ? 0 : -1; 689 } 690 691 /* 692 * Map some portion of the allocated scatterlist to an iovec, suitable for 693 * kernel sockets to copy data in/out. 694 */ 695 static int iscsit_map_iovec( 696 struct iscsi_cmd *cmd, 697 struct kvec *iov, 698 u32 data_offset, 699 u32 data_length) 700 { 701 u32 i = 0; 702 struct scatterlist *sg; 703 unsigned int page_off; 704 705 /* 706 * We know each entry in t_data_sg contains a page. 707 */ 708 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 709 page_off = (data_offset % PAGE_SIZE); 710 711 cmd->first_data_sg = sg; 712 cmd->first_data_sg_off = page_off; 713 714 while (data_length) { 715 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 716 717 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 718 iov[i].iov_len = cur_len; 719 720 data_length -= cur_len; 721 page_off = 0; 722 sg = sg_next(sg); 723 i++; 724 } 725 726 cmd->kmapped_nents = i; 727 728 return i; 729 } 730 731 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 732 { 733 u32 i; 734 struct scatterlist *sg; 735 736 sg = cmd->first_data_sg; 737 738 for (i = 0; i < cmd->kmapped_nents; i++) 739 kunmap(sg_page(&sg[i])); 740 } 741 742 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 743 { 744 struct iscsi_cmd *cmd; 745 746 conn->exp_statsn = exp_statsn; 747 748 spin_lock_bh(&conn->cmd_lock); 749 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 750 spin_lock(&cmd->istate_lock); 751 if ((cmd->i_state == ISTATE_SENT_STATUS) && 752 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 753 cmd->i_state = ISTATE_REMOVE; 754 spin_unlock(&cmd->istate_lock); 755 iscsit_add_cmd_to_immediate_queue(cmd, conn, 756 cmd->i_state); 757 continue; 758 } 759 spin_unlock(&cmd->istate_lock); 760 } 761 spin_unlock_bh(&conn->cmd_lock); 762 } 763 764 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 765 { 766 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 767 768 iov_count += ISCSI_IOV_DATA_BUFFER; 769 770 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 771 if (!cmd->iov_data) { 772 pr_err("Unable to allocate cmd->iov_data\n"); 773 return -ENOMEM; 774 } 775 776 cmd->orig_iov_data_count = iov_count; 777 return 0; 778 } 779 780 static int iscsit_handle_scsi_cmd( 781 struct iscsi_conn *conn, 782 unsigned char *buf) 783 { 784 int data_direction, payload_length, cmdsn_ret = 0, immed_ret; 785 struct iscsi_cmd *cmd = NULL; 786 struct iscsi_scsi_req *hdr; 787 int iscsi_task_attr; 788 int sam_task_attr; 789 790 spin_lock_bh(&conn->sess->session_stats_lock); 791 conn->sess->cmd_pdus++; 792 if (conn->sess->se_sess->se_node_acl) { 793 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 794 conn->sess->se_sess->se_node_acl->num_cmds++; 795 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 796 } 797 spin_unlock_bh(&conn->sess->session_stats_lock); 798 799 hdr = (struct iscsi_scsi_req *) buf; 800 payload_length = ntoh24(hdr->dlength); 801 802 /* FIXME; Add checks for AdditionalHeaderSegment */ 803 804 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 805 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 806 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 807 " not set. Bad iSCSI Initiator.\n"); 808 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 809 buf, conn); 810 } 811 812 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 813 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 814 /* 815 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) 816 * that adds support for RESERVE/RELEASE. There is a bug 817 * add with this new functionality that sets R/W bits when 818 * neither CDB carries any READ or WRITE datapayloads. 819 */ 820 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { 821 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 822 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 823 goto done; 824 } 825 826 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 827 " set when Expected Data Transfer Length is 0 for" 828 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); 829 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 830 buf, conn); 831 } 832 done: 833 834 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 835 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 836 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 837 " MUST be set if Expected Data Transfer Length is not 0." 838 " Bad iSCSI Initiator\n"); 839 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 840 buf, conn); 841 } 842 843 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 844 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 845 pr_err("Bidirectional operations not supported!\n"); 846 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 847 buf, conn); 848 } 849 850 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 851 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 852 " Scsi Command PDU.\n"); 853 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 854 buf, conn); 855 } 856 857 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 858 pr_err("ImmediateData=No but DataSegmentLength=%u," 859 " protocol error.\n", payload_length); 860 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 861 buf, conn); 862 } 863 864 if ((be32_to_cpu(hdr->data_length )== payload_length) && 865 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 866 pr_err("Expected Data Transfer Length and Length of" 867 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 868 " bit is not set protocol error\n"); 869 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 870 buf, conn); 871 } 872 873 if (payload_length > be32_to_cpu(hdr->data_length)) { 874 pr_err("DataSegmentLength: %u is greater than" 875 " EDTL: %u, protocol error.\n", payload_length, 876 hdr->data_length); 877 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 878 buf, conn); 879 } 880 881 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 882 pr_err("DataSegmentLength: %u is greater than" 883 " MaxXmitDataSegmentLength: %u, protocol error.\n", 884 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 885 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 886 buf, conn); 887 } 888 889 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 890 pr_err("DataSegmentLength: %u is greater than" 891 " FirstBurstLength: %u, protocol error.\n", 892 payload_length, conn->sess->sess_ops->FirstBurstLength); 893 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 894 buf, conn); 895 } 896 897 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 898 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 899 DMA_NONE; 900 901 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 902 if (!cmd) 903 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, 904 buf, conn); 905 906 cmd->data_direction = data_direction; 907 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 908 /* 909 * Figure out the SAM Task Attribute for the incoming SCSI CDB 910 */ 911 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 912 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 913 sam_task_attr = MSG_SIMPLE_TAG; 914 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 915 sam_task_attr = MSG_ORDERED_TAG; 916 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 917 sam_task_attr = MSG_HEAD_TAG; 918 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 919 sam_task_attr = MSG_ACA_TAG; 920 else { 921 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 922 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 923 sam_task_attr = MSG_SIMPLE_TAG; 924 } 925 926 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 927 cmd->i_state = ISTATE_NEW_CMD; 928 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 929 cmd->immediate_data = (payload_length) ? 1 : 0; 930 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 931 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 932 if (cmd->unsolicited_data) 933 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 934 935 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 936 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 937 spin_lock_bh(&conn->sess->ttt_lock); 938 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 939 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 940 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 941 spin_unlock_bh(&conn->sess->ttt_lock); 942 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 943 cmd->targ_xfer_tag = 0xFFFFFFFF; 944 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 945 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 946 cmd->first_burst_len = payload_length; 947 948 if (cmd->data_direction == DMA_FROM_DEVICE) { 949 struct iscsi_datain_req *dr; 950 951 dr = iscsit_allocate_datain_req(); 952 if (!dr) 953 return iscsit_add_reject_from_cmd( 954 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 955 1, 1, buf, cmd); 956 957 iscsit_attach_datain_req(cmd, dr); 958 } 959 960 /* 961 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 962 */ 963 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 964 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 965 cmd->data_direction, sam_task_attr, 966 cmd->sense_buffer + 2); 967 968 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 969 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 970 hdr->cmdsn, hdr->data_length, payload_length, conn->cid); 971 972 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 973 scsilun_to_int(&hdr->lun)); 974 if (cmd->sense_reason) 975 goto attach_cmd; 976 977 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 978 if (cmd->sense_reason) { 979 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 980 return iscsit_add_reject_from_cmd( 981 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 982 1, 1, buf, cmd); 983 } 984 985 goto attach_cmd; 986 } 987 988 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 989 return iscsit_add_reject_from_cmd( 990 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 991 1, 1, buf, cmd); 992 } 993 994 attach_cmd: 995 spin_lock_bh(&conn->cmd_lock); 996 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 997 spin_unlock_bh(&conn->cmd_lock); 998 /* 999 * Check if we need to delay processing because of ALUA 1000 * Active/NonOptimized primary access state.. 1001 */ 1002 core_alua_check_nonop_delay(&cmd->se_cmd); 1003 1004 if (iscsit_allocate_iovecs(cmd) < 0) { 1005 return iscsit_add_reject_from_cmd( 1006 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1007 1, 0, buf, cmd); 1008 } 1009 1010 /* 1011 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1012 * the Immediate Bit is not set, and no Immediate 1013 * Data is attached. 1014 * 1015 * A PDU/CmdSN carrying Immediate Data can only 1016 * be processed after the DataCRC has passed. 1017 * If the DataCRC fails, the CmdSN MUST NOT 1018 * be acknowledged. (See below) 1019 */ 1020 if (!cmd->immediate_data) { 1021 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1022 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1023 return 0; 1024 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1025 return iscsit_add_reject_from_cmd( 1026 ISCSI_REASON_PROTOCOL_ERROR, 1027 1, 0, buf, cmd); 1028 } 1029 1030 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1031 1032 /* 1033 * If no Immediate Data is attached, it's OK to return now. 1034 */ 1035 if (!cmd->immediate_data) { 1036 if (!cmd->sense_reason && cmd->unsolicited_data) { 1037 iscsit_set_dataout_sequence_values(cmd); 1038 1039 spin_lock_bh(&cmd->dataout_timeout_lock); 1040 iscsit_start_dataout_timer(cmd, cmd->conn); 1041 spin_unlock_bh(&cmd->dataout_timeout_lock); 1042 } 1043 1044 return 0; 1045 } 1046 1047 /* 1048 * Early CHECK_CONDITIONs never make it to the transport processing 1049 * thread. They are processed in CmdSN order by 1050 * iscsit_check_received_cmdsn() below. 1051 */ 1052 if (cmd->sense_reason) { 1053 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1054 goto after_immediate_data; 1055 } 1056 /* 1057 * Call directly into transport_generic_new_cmd() to perform 1058 * the backend memory allocation. 1059 */ 1060 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1061 if (cmd->sense_reason) { 1062 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1063 goto after_immediate_data; 1064 } 1065 1066 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length); 1067 after_immediate_data: 1068 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1069 /* 1070 * A PDU/CmdSN carrying Immediate Data passed 1071 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1072 * Immediate Bit is not set. 1073 */ 1074 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1075 /* 1076 * Special case for Unsupported SAM WRITE Opcodes 1077 * and ImmediateData=Yes. 1078 */ 1079 if (cmd->sense_reason) { 1080 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) 1081 return -1; 1082 } else if (cmd->unsolicited_data) { 1083 iscsit_set_dataout_sequence_values(cmd); 1084 1085 spin_lock_bh(&cmd->dataout_timeout_lock); 1086 iscsit_start_dataout_timer(cmd, cmd->conn); 1087 spin_unlock_bh(&cmd->dataout_timeout_lock); 1088 } 1089 1090 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1091 return iscsit_add_reject_from_cmd( 1092 ISCSI_REASON_PROTOCOL_ERROR, 1093 1, 0, buf, cmd); 1094 1095 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1096 /* 1097 * Immediate Data failed DataCRC and ERL>=1, 1098 * silently drop this PDU and let the initiator 1099 * plug the CmdSN gap. 1100 * 1101 * FIXME: Send Unsolicited NOPIN with reserved 1102 * TTT here to help the initiator figure out 1103 * the missing CmdSN, although they should be 1104 * intelligent enough to determine the missing 1105 * CmdSN and issue a retry to plug the sequence. 1106 */ 1107 cmd->i_state = ISTATE_REMOVE; 1108 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 1109 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1110 return -1; 1111 1112 return 0; 1113 } 1114 1115 static u32 iscsit_do_crypto_hash_sg( 1116 struct hash_desc *hash, 1117 struct iscsi_cmd *cmd, 1118 u32 data_offset, 1119 u32 data_length, 1120 u32 padding, 1121 u8 *pad_bytes) 1122 { 1123 u32 data_crc; 1124 u32 i; 1125 struct scatterlist *sg; 1126 unsigned int page_off; 1127 1128 crypto_hash_init(hash); 1129 1130 sg = cmd->first_data_sg; 1131 page_off = cmd->first_data_sg_off; 1132 1133 i = 0; 1134 while (data_length) { 1135 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1136 1137 crypto_hash_update(hash, &sg[i], cur_len); 1138 1139 data_length -= cur_len; 1140 page_off = 0; 1141 i++; 1142 } 1143 1144 if (padding) { 1145 struct scatterlist pad_sg; 1146 1147 sg_init_one(&pad_sg, pad_bytes, padding); 1148 crypto_hash_update(hash, &pad_sg, padding); 1149 } 1150 crypto_hash_final(hash, (u8 *) &data_crc); 1151 1152 return data_crc; 1153 } 1154 1155 static void iscsit_do_crypto_hash_buf( 1156 struct hash_desc *hash, 1157 unsigned char *buf, 1158 u32 payload_length, 1159 u32 padding, 1160 u8 *pad_bytes, 1161 u8 *data_crc) 1162 { 1163 struct scatterlist sg; 1164 1165 crypto_hash_init(hash); 1166 1167 sg_init_one(&sg, buf, payload_length); 1168 crypto_hash_update(hash, &sg, payload_length); 1169 1170 if (padding) { 1171 sg_init_one(&sg, pad_bytes, padding); 1172 crypto_hash_update(hash, &sg, padding); 1173 } 1174 crypto_hash_final(hash, data_crc); 1175 } 1176 1177 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1178 { 1179 int iov_ret, ooo_cmdsn = 0, ret; 1180 u8 data_crc_failed = 0; 1181 u32 checksum, iov_count = 0, padding = 0, rx_got = 0; 1182 u32 rx_size = 0, payload_length; 1183 struct iscsi_cmd *cmd = NULL; 1184 struct se_cmd *se_cmd; 1185 struct iscsi_data *hdr; 1186 struct kvec *iov; 1187 unsigned long flags; 1188 1189 hdr = (struct iscsi_data *) buf; 1190 payload_length = ntoh24(hdr->dlength); 1191 1192 if (!payload_length) { 1193 pr_err("DataOUT payload is ZERO, protocol error.\n"); 1194 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1195 buf, conn); 1196 } 1197 1198 /* iSCSI write */ 1199 spin_lock_bh(&conn->sess->session_stats_lock); 1200 conn->sess->rx_data_octets += payload_length; 1201 if (conn->sess->se_sess->se_node_acl) { 1202 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 1203 conn->sess->se_sess->se_node_acl->write_bytes += payload_length; 1204 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 1205 } 1206 spin_unlock_bh(&conn->sess->session_stats_lock); 1207 1208 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1209 pr_err("DataSegmentLength: %u is greater than" 1210 " MaxXmitDataSegmentLength: %u\n", payload_length, 1211 conn->conn_ops->MaxXmitDataSegmentLength); 1212 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1213 buf, conn); 1214 } 1215 1216 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1217 payload_length); 1218 if (!cmd) 1219 return 0; 1220 1221 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1222 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1223 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset, 1224 payload_length, conn->cid); 1225 1226 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1227 pr_err("Command ITT: 0x%08x received DataOUT after" 1228 " last DataOUT received, dumping payload\n", 1229 cmd->init_task_tag); 1230 return iscsit_dump_data_payload(conn, payload_length, 1); 1231 } 1232 1233 if (cmd->data_direction != DMA_TO_DEVICE) { 1234 pr_err("Command ITT: 0x%08x received DataOUT for a" 1235 " NON-WRITE command.\n", cmd->init_task_tag); 1236 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 1237 1, 0, buf, cmd); 1238 } 1239 se_cmd = &cmd->se_cmd; 1240 iscsit_mod_dataout_timer(cmd); 1241 1242 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1243 pr_err("DataOut Offset: %u, Length %u greater than" 1244 " iSCSI Command EDTL %u, protocol error.\n", 1245 hdr->offset, payload_length, cmd->se_cmd.data_length); 1246 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 1247 1, 0, buf, cmd); 1248 } 1249 1250 if (cmd->unsolicited_data) { 1251 int dump_unsolicited_data = 0; 1252 1253 if (conn->sess->sess_ops->InitialR2T) { 1254 pr_err("Received unexpected unsolicited data" 1255 " while InitialR2T=Yes, protocol error.\n"); 1256 transport_send_check_condition_and_sense(&cmd->se_cmd, 1257 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1258 return -1; 1259 } 1260 /* 1261 * Special case for dealing with Unsolicited DataOUT 1262 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1263 * failures; 1264 */ 1265 1266 /* Something's amiss if we're not in WRITE_PENDING state... */ 1267 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1268 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1269 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1270 1271 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1272 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1273 dump_unsolicited_data = 1; 1274 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1275 1276 if (dump_unsolicited_data) { 1277 /* 1278 * Check if a delayed TASK_ABORTED status needs to 1279 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1280 * received with the unsolicitied data out. 1281 */ 1282 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1283 iscsit_stop_dataout_timer(cmd); 1284 1285 transport_check_aborted_status(se_cmd, 1286 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1287 return iscsit_dump_data_payload(conn, payload_length, 1); 1288 } 1289 } else { 1290 /* 1291 * For the normal solicited data path: 1292 * 1293 * Check for a delayed TASK_ABORTED status and dump any 1294 * incoming data out payload if one exists. Also, when the 1295 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1296 * data out sequence, we decrement outstanding_r2ts. Once 1297 * outstanding_r2ts reaches zero, go ahead and send the delayed 1298 * TASK_ABORTED status. 1299 */ 1300 if (se_cmd->transport_state & CMD_T_ABORTED) { 1301 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1302 if (--cmd->outstanding_r2ts < 1) { 1303 iscsit_stop_dataout_timer(cmd); 1304 transport_check_aborted_status( 1305 se_cmd, 1); 1306 } 1307 1308 return iscsit_dump_data_payload(conn, payload_length, 1); 1309 } 1310 } 1311 /* 1312 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1313 * within-command recovery checks before receiving the payload. 1314 */ 1315 ret = iscsit_check_pre_dataout(cmd, buf); 1316 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY) 1317 return 0; 1318 else if (ret == DATAOUT_CANNOT_RECOVER) 1319 return -1; 1320 1321 rx_size += payload_length; 1322 iov = &cmd->iov_data[0]; 1323 1324 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1325 payload_length); 1326 if (iov_ret < 0) 1327 return -1; 1328 1329 iov_count += iov_ret; 1330 1331 padding = ((-payload_length) & 3); 1332 if (padding != 0) { 1333 iov[iov_count].iov_base = cmd->pad_bytes; 1334 iov[iov_count++].iov_len = padding; 1335 rx_size += padding; 1336 pr_debug("Receiving %u padding bytes.\n", padding); 1337 } 1338 1339 if (conn->conn_ops->DataDigest) { 1340 iov[iov_count].iov_base = &checksum; 1341 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1342 rx_size += ISCSI_CRC_LEN; 1343 } 1344 1345 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1346 1347 iscsit_unmap_iovec(cmd); 1348 1349 if (rx_got != rx_size) 1350 return -1; 1351 1352 if (conn->conn_ops->DataDigest) { 1353 u32 data_crc; 1354 1355 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1356 be32_to_cpu(hdr->offset), 1357 payload_length, padding, 1358 cmd->pad_bytes); 1359 1360 if (checksum != data_crc) { 1361 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1362 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1363 " does not match computed 0x%08x\n", 1364 hdr->itt, hdr->offset, payload_length, 1365 hdr->datasn, checksum, data_crc); 1366 data_crc_failed = 1; 1367 } else { 1368 pr_debug("Got CRC32C DataDigest 0x%08x for" 1369 " %u bytes of Data Out\n", checksum, 1370 payload_length); 1371 } 1372 } 1373 /* 1374 * Increment post receive data and CRC values or perform 1375 * within-command recovery. 1376 */ 1377 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed); 1378 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1379 return 0; 1380 else if (ret == DATAOUT_SEND_R2T) { 1381 iscsit_set_dataout_sequence_values(cmd); 1382 iscsit_build_r2ts_for_cmd(cmd, conn, false); 1383 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) { 1384 /* 1385 * Handle extra special case for out of order 1386 * Unsolicited Data Out. 1387 */ 1388 spin_lock_bh(&cmd->istate_lock); 1389 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1390 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1391 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1392 spin_unlock_bh(&cmd->istate_lock); 1393 1394 iscsit_stop_dataout_timer(cmd); 1395 if (ooo_cmdsn) 1396 return 0; 1397 target_execute_cmd(&cmd->se_cmd); 1398 return 0; 1399 } else /* DATAOUT_CANNOT_RECOVER */ 1400 return -1; 1401 1402 return 0; 1403 } 1404 1405 static int iscsit_handle_nop_out( 1406 struct iscsi_conn *conn, 1407 unsigned char *buf) 1408 { 1409 unsigned char *ping_data = NULL; 1410 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size; 1411 u32 checksum, data_crc, padding = 0, payload_length; 1412 struct iscsi_cmd *cmd = NULL; 1413 struct kvec *iov = NULL; 1414 struct iscsi_nopout *hdr; 1415 1416 hdr = (struct iscsi_nopout *) buf; 1417 payload_length = ntoh24(hdr->dlength); 1418 1419 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1420 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1421 " not set, protocol error.\n"); 1422 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1423 buf, conn); 1424 } 1425 1426 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1427 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1428 " greater than MaxXmitDataSegmentLength: %u, protocol" 1429 " error.\n", payload_length, 1430 conn->conn_ops->MaxXmitDataSegmentLength); 1431 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1432 buf, conn); 1433 } 1434 1435 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x," 1436 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1437 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1438 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1439 payload_length); 1440 /* 1441 * This is not a response to a Unsolicited NopIN, which means 1442 * it can either be a NOPOUT ping request (with a valid ITT), 1443 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1444 * Either way, make sure we allocate an struct iscsi_cmd, as both 1445 * can contain ping data. 1446 */ 1447 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1448 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1449 if (!cmd) 1450 return iscsit_add_reject( 1451 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1452 1, buf, conn); 1453 1454 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1455 cmd->i_state = ISTATE_SEND_NOPIN; 1456 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1457 1 : 0); 1458 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1459 cmd->targ_xfer_tag = 0xFFFFFFFF; 1460 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1461 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1462 cmd->data_direction = DMA_NONE; 1463 } 1464 1465 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1466 rx_size = payload_length; 1467 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1468 if (!ping_data) { 1469 pr_err("Unable to allocate memory for" 1470 " NOPOUT ping data.\n"); 1471 ret = -1; 1472 goto out; 1473 } 1474 1475 iov = &cmd->iov_misc[0]; 1476 iov[niov].iov_base = ping_data; 1477 iov[niov++].iov_len = payload_length; 1478 1479 padding = ((-payload_length) & 3); 1480 if (padding != 0) { 1481 pr_debug("Receiving %u additional bytes" 1482 " for padding.\n", padding); 1483 iov[niov].iov_base = &cmd->pad_bytes; 1484 iov[niov++].iov_len = padding; 1485 rx_size += padding; 1486 } 1487 if (conn->conn_ops->DataDigest) { 1488 iov[niov].iov_base = &checksum; 1489 iov[niov++].iov_len = ISCSI_CRC_LEN; 1490 rx_size += ISCSI_CRC_LEN; 1491 } 1492 1493 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1494 if (rx_got != rx_size) { 1495 ret = -1; 1496 goto out; 1497 } 1498 1499 if (conn->conn_ops->DataDigest) { 1500 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1501 ping_data, payload_length, 1502 padding, cmd->pad_bytes, 1503 (u8 *)&data_crc); 1504 1505 if (checksum != data_crc) { 1506 pr_err("Ping data CRC32C DataDigest" 1507 " 0x%08x does not match computed 0x%08x\n", 1508 checksum, data_crc); 1509 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1510 pr_err("Unable to recover from" 1511 " NOPOUT Ping DataCRC failure while in" 1512 " ERL=0.\n"); 1513 ret = -1; 1514 goto out; 1515 } else { 1516 /* 1517 * Silently drop this PDU and let the 1518 * initiator plug the CmdSN gap. 1519 */ 1520 pr_debug("Dropping NOPOUT" 1521 " Command CmdSN: 0x%08x due to" 1522 " DataCRC error.\n", hdr->cmdsn); 1523 ret = 0; 1524 goto out; 1525 } 1526 } else { 1527 pr_debug("Got CRC32C DataDigest" 1528 " 0x%08x for %u bytes of ping data.\n", 1529 checksum, payload_length); 1530 } 1531 } 1532 1533 ping_data[payload_length] = '\0'; 1534 /* 1535 * Attach ping data to struct iscsi_cmd->buf_ptr. 1536 */ 1537 cmd->buf_ptr = ping_data; 1538 cmd->buf_ptr_size = payload_length; 1539 1540 pr_debug("Got %u bytes of NOPOUT ping" 1541 " data.\n", payload_length); 1542 pr_debug("Ping Data: \"%s\"\n", ping_data); 1543 } 1544 1545 if (hdr->itt != RESERVED_ITT) { 1546 if (!cmd) { 1547 pr_err("Checking CmdSN for NOPOUT," 1548 " but cmd is NULL!\n"); 1549 return -1; 1550 } 1551 /* 1552 * Initiator is expecting a NopIN ping reply, 1553 */ 1554 spin_lock_bh(&conn->cmd_lock); 1555 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1556 spin_unlock_bh(&conn->cmd_lock); 1557 1558 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1559 1560 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1561 iscsit_add_cmd_to_response_queue(cmd, conn, 1562 cmd->i_state); 1563 return 0; 1564 } 1565 1566 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1567 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1568 ret = 0; 1569 goto ping_out; 1570 } 1571 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1572 return iscsit_add_reject_from_cmd( 1573 ISCSI_REASON_PROTOCOL_ERROR, 1574 1, 0, buf, cmd); 1575 1576 return 0; 1577 } 1578 1579 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1580 /* 1581 * This was a response to a unsolicited NOPIN ping. 1582 */ 1583 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1584 if (!cmd) 1585 return -1; 1586 1587 iscsit_stop_nopin_response_timer(conn); 1588 1589 cmd->i_state = ISTATE_REMOVE; 1590 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 1591 iscsit_start_nopin_timer(conn); 1592 } else { 1593 /* 1594 * Initiator is not expecting a NOPIN is response. 1595 * Just ignore for now. 1596 * 1597 * iSCSI v19-91 10.18 1598 * "A NOP-OUT may also be used to confirm a changed 1599 * ExpStatSN if another PDU will not be available 1600 * for a long time." 1601 */ 1602 ret = 0; 1603 goto out; 1604 } 1605 1606 return 0; 1607 out: 1608 if (cmd) 1609 iscsit_release_cmd(cmd); 1610 ping_out: 1611 kfree(ping_data); 1612 return ret; 1613 } 1614 1615 static int iscsit_handle_task_mgt_cmd( 1616 struct iscsi_conn *conn, 1617 unsigned char *buf) 1618 { 1619 struct iscsi_cmd *cmd; 1620 struct se_tmr_req *se_tmr; 1621 struct iscsi_tmr_req *tmr_req; 1622 struct iscsi_tm *hdr; 1623 int out_of_order_cmdsn = 0; 1624 int ret; 1625 u8 function; 1626 1627 hdr = (struct iscsi_tm *) buf; 1628 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1629 function = hdr->flags; 1630 1631 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1632 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1633 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1634 hdr->rtt, hdr->refcmdsn, conn->cid); 1635 1636 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1637 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1638 hdr->rtt != RESERVED_ITT)) { 1639 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1640 hdr->rtt = RESERVED_ITT; 1641 } 1642 1643 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1644 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1645 pr_err("Task Management Request TASK_REASSIGN not" 1646 " issued as immediate command, bad iSCSI Initiator" 1647 "implementation\n"); 1648 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1649 buf, conn); 1650 } 1651 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1652 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1653 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1654 1655 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1656 if (!cmd) 1657 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1658 1, buf, conn); 1659 1660 cmd->data_direction = DMA_NONE; 1661 1662 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1663 if (!cmd->tmr_req) { 1664 pr_err("Unable to allocate memory for" 1665 " Task Management command!\n"); 1666 return iscsit_add_reject_from_cmd( 1667 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1668 1, 1, buf, cmd); 1669 } 1670 1671 /* 1672 * TASK_REASSIGN for ERL=2 / connection stays inside of 1673 * LIO-Target $FABRIC_MOD 1674 */ 1675 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1676 1677 u8 tcm_function; 1678 int ret; 1679 1680 transport_init_se_cmd(&cmd->se_cmd, 1681 &lio_target_fabric_configfs->tf_ops, 1682 conn->sess->se_sess, 0, DMA_NONE, 1683 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1684 1685 switch (function) { 1686 case ISCSI_TM_FUNC_ABORT_TASK: 1687 tcm_function = TMR_ABORT_TASK; 1688 break; 1689 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1690 tcm_function = TMR_ABORT_TASK_SET; 1691 break; 1692 case ISCSI_TM_FUNC_CLEAR_ACA: 1693 tcm_function = TMR_CLEAR_ACA; 1694 break; 1695 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1696 tcm_function = TMR_CLEAR_TASK_SET; 1697 break; 1698 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1699 tcm_function = TMR_LUN_RESET; 1700 break; 1701 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1702 tcm_function = TMR_TARGET_WARM_RESET; 1703 break; 1704 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1705 tcm_function = TMR_TARGET_COLD_RESET; 1706 break; 1707 default: 1708 pr_err("Unknown iSCSI TMR Function:" 1709 " 0x%02x\n", function); 1710 return iscsit_add_reject_from_cmd( 1711 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1712 1, 1, buf, cmd); 1713 } 1714 1715 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1716 tcm_function, GFP_KERNEL); 1717 if (ret < 0) 1718 return iscsit_add_reject_from_cmd( 1719 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1720 1, 1, buf, cmd); 1721 1722 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1723 } 1724 1725 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1726 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1727 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1728 cmd->init_task_tag = hdr->itt; 1729 cmd->targ_xfer_tag = 0xFFFFFFFF; 1730 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1731 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1732 se_tmr = cmd->se_cmd.se_tmr_req; 1733 tmr_req = cmd->tmr_req; 1734 /* 1735 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1736 */ 1737 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1738 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1739 scsilun_to_int(&hdr->lun)); 1740 if (ret < 0) { 1741 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1742 goto attach; 1743 } 1744 } 1745 1746 switch (function) { 1747 case ISCSI_TM_FUNC_ABORT_TASK: 1748 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1749 if (se_tmr->response) 1750 goto attach; 1751 break; 1752 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1753 case ISCSI_TM_FUNC_CLEAR_ACA: 1754 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1755 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1756 break; 1757 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1758 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1759 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1760 goto attach; 1761 } 1762 break; 1763 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1764 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1765 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1766 goto attach; 1767 } 1768 break; 1769 case ISCSI_TM_FUNC_TASK_REASSIGN: 1770 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1771 /* 1772 * Perform sanity checks on the ExpDataSN only if the 1773 * TASK_REASSIGN was successful. 1774 */ 1775 if (se_tmr->response) 1776 break; 1777 1778 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1779 return iscsit_add_reject_from_cmd( 1780 ISCSI_REASON_BOOKMARK_INVALID, 1, 1, 1781 buf, cmd); 1782 break; 1783 default: 1784 pr_err("Unknown TMR function: 0x%02x, protocol" 1785 " error.\n", function); 1786 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1787 goto attach; 1788 } 1789 1790 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1791 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1792 se_tmr->call_transport = 1; 1793 attach: 1794 spin_lock_bh(&conn->cmd_lock); 1795 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1796 spin_unlock_bh(&conn->cmd_lock); 1797 1798 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1799 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1800 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1801 out_of_order_cmdsn = 1; 1802 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1803 return 0; 1804 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1805 return iscsit_add_reject_from_cmd( 1806 ISCSI_REASON_PROTOCOL_ERROR, 1807 1, 0, buf, cmd); 1808 } 1809 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1810 1811 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1812 return 0; 1813 /* 1814 * Found the referenced task, send to transport for processing. 1815 */ 1816 if (se_tmr->call_transport) 1817 return transport_generic_handle_tmr(&cmd->se_cmd); 1818 1819 /* 1820 * Could not find the referenced LUN, task, or Task Management 1821 * command not authorized or supported. Change state and 1822 * let the tx_thread send the response. 1823 * 1824 * For connection recovery, this is also the default action for 1825 * TMR TASK_REASSIGN. 1826 */ 1827 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1828 return 0; 1829 } 1830 1831 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1832 static int iscsit_handle_text_cmd( 1833 struct iscsi_conn *conn, 1834 unsigned char *buf) 1835 { 1836 char *text_ptr, *text_in; 1837 int cmdsn_ret, niov = 0, rx_got, rx_size; 1838 u32 checksum = 0, data_crc = 0, payload_length; 1839 u32 padding = 0, pad_bytes = 0, text_length = 0; 1840 struct iscsi_cmd *cmd; 1841 struct kvec iov[3]; 1842 struct iscsi_text *hdr; 1843 1844 hdr = (struct iscsi_text *) buf; 1845 payload_length = ntoh24(hdr->dlength); 1846 1847 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1848 pr_err("Unable to accept text parameter length: %u" 1849 "greater than MaxXmitDataSegmentLength %u.\n", 1850 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1851 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1852 buf, conn); 1853 } 1854 1855 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1856 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1857 hdr->exp_statsn, payload_length); 1858 1859 rx_size = text_length = payload_length; 1860 if (text_length) { 1861 text_in = kzalloc(text_length, GFP_KERNEL); 1862 if (!text_in) { 1863 pr_err("Unable to allocate memory for" 1864 " incoming text parameters\n"); 1865 return -1; 1866 } 1867 1868 memset(iov, 0, 3 * sizeof(struct kvec)); 1869 iov[niov].iov_base = text_in; 1870 iov[niov++].iov_len = text_length; 1871 1872 padding = ((-payload_length) & 3); 1873 if (padding != 0) { 1874 iov[niov].iov_base = &pad_bytes; 1875 iov[niov++].iov_len = padding; 1876 rx_size += padding; 1877 pr_debug("Receiving %u additional bytes" 1878 " for padding.\n", padding); 1879 } 1880 if (conn->conn_ops->DataDigest) { 1881 iov[niov].iov_base = &checksum; 1882 iov[niov++].iov_len = ISCSI_CRC_LEN; 1883 rx_size += ISCSI_CRC_LEN; 1884 } 1885 1886 rx_got = rx_data(conn, &iov[0], niov, rx_size); 1887 if (rx_got != rx_size) { 1888 kfree(text_in); 1889 return -1; 1890 } 1891 1892 if (conn->conn_ops->DataDigest) { 1893 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1894 text_in, text_length, 1895 padding, (u8 *)&pad_bytes, 1896 (u8 *)&data_crc); 1897 1898 if (checksum != data_crc) { 1899 pr_err("Text data CRC32C DataDigest" 1900 " 0x%08x does not match computed" 1901 " 0x%08x\n", checksum, data_crc); 1902 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1903 pr_err("Unable to recover from" 1904 " Text Data digest failure while in" 1905 " ERL=0.\n"); 1906 kfree(text_in); 1907 return -1; 1908 } else { 1909 /* 1910 * Silently drop this PDU and let the 1911 * initiator plug the CmdSN gap. 1912 */ 1913 pr_debug("Dropping Text" 1914 " Command CmdSN: 0x%08x due to" 1915 " DataCRC error.\n", hdr->cmdsn); 1916 kfree(text_in); 1917 return 0; 1918 } 1919 } else { 1920 pr_debug("Got CRC32C DataDigest" 1921 " 0x%08x for %u bytes of text data.\n", 1922 checksum, text_length); 1923 } 1924 } 1925 text_in[text_length - 1] = '\0'; 1926 pr_debug("Successfully read %d bytes of text" 1927 " data.\n", text_length); 1928 1929 if (strncmp("SendTargets", text_in, 11) != 0) { 1930 pr_err("Received Text Data that is not" 1931 " SendTargets, cannot continue.\n"); 1932 kfree(text_in); 1933 return -1; 1934 } 1935 text_ptr = strchr(text_in, '='); 1936 if (!text_ptr) { 1937 pr_err("No \"=\" separator found in Text Data," 1938 " cannot continue.\n"); 1939 kfree(text_in); 1940 return -1; 1941 } 1942 if (strncmp("=All", text_ptr, 4) != 0) { 1943 pr_err("Unable to locate All value for" 1944 " SendTargets key, cannot continue.\n"); 1945 kfree(text_in); 1946 return -1; 1947 } 1948 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */ 1949 kfree(text_in); 1950 } 1951 1952 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1953 if (!cmd) 1954 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1955 1, buf, conn); 1956 1957 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1958 cmd->i_state = ISTATE_SEND_TEXTRSP; 1959 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1960 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1961 cmd->targ_xfer_tag = 0xFFFFFFFF; 1962 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1963 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1964 cmd->data_direction = DMA_NONE; 1965 1966 spin_lock_bh(&conn->cmd_lock); 1967 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1968 spin_unlock_bh(&conn->cmd_lock); 1969 1970 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1971 1972 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1973 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1974 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1975 return iscsit_add_reject_from_cmd( 1976 ISCSI_REASON_PROTOCOL_ERROR, 1977 1, 0, buf, cmd); 1978 1979 return 0; 1980 } 1981 1982 return iscsit_execute_cmd(cmd, 0); 1983 } 1984 1985 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1986 { 1987 struct iscsi_conn *conn_p; 1988 struct iscsi_session *sess = conn->sess; 1989 1990 pr_debug("Received logout request CLOSESESSION on CID: %hu" 1991 " for SID: %u.\n", conn->cid, conn->sess->sid); 1992 1993 atomic_set(&sess->session_logout, 1); 1994 atomic_set(&conn->conn_logout_remove, 1); 1995 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 1996 1997 iscsit_inc_conn_usage_count(conn); 1998 iscsit_inc_session_usage_count(sess); 1999 2000 spin_lock_bh(&sess->conn_lock); 2001 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2002 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2003 continue; 2004 2005 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2006 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2007 } 2008 spin_unlock_bh(&sess->conn_lock); 2009 2010 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2011 2012 return 0; 2013 } 2014 2015 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2016 { 2017 struct iscsi_conn *l_conn; 2018 struct iscsi_session *sess = conn->sess; 2019 2020 pr_debug("Received logout request CLOSECONNECTION for CID:" 2021 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2022 2023 /* 2024 * A Logout Request with a CLOSECONNECTION reason code for a CID 2025 * can arrive on a connection with a differing CID. 2026 */ 2027 if (conn->cid == cmd->logout_cid) { 2028 spin_lock_bh(&conn->state_lock); 2029 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2030 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2031 2032 atomic_set(&conn->conn_logout_remove, 1); 2033 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2034 iscsit_inc_conn_usage_count(conn); 2035 2036 spin_unlock_bh(&conn->state_lock); 2037 } else { 2038 /* 2039 * Handle all different cid CLOSECONNECTION requests in 2040 * iscsit_logout_post_handler_diffcid() as to give enough 2041 * time for any non immediate command's CmdSN to be 2042 * acknowledged on the connection in question. 2043 * 2044 * Here we simply make sure the CID is still around. 2045 */ 2046 l_conn = iscsit_get_conn_from_cid(sess, 2047 cmd->logout_cid); 2048 if (!l_conn) { 2049 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2050 iscsit_add_cmd_to_response_queue(cmd, conn, 2051 cmd->i_state); 2052 return 0; 2053 } 2054 2055 iscsit_dec_conn_usage_count(l_conn); 2056 } 2057 2058 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2059 2060 return 0; 2061 } 2062 2063 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2064 { 2065 struct iscsi_session *sess = conn->sess; 2066 2067 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2068 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2069 2070 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2071 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2072 " while ERL!=2.\n"); 2073 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2074 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2075 return 0; 2076 } 2077 2078 if (conn->cid == cmd->logout_cid) { 2079 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2080 " with CID: %hu on CID: %hu, implementation error.\n", 2081 cmd->logout_cid, conn->cid); 2082 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2083 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2084 return 0; 2085 } 2086 2087 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2088 2089 return 0; 2090 } 2091 2092 static int iscsit_handle_logout_cmd( 2093 struct iscsi_conn *conn, 2094 unsigned char *buf) 2095 { 2096 int cmdsn_ret, logout_remove = 0; 2097 u8 reason_code = 0; 2098 struct iscsi_cmd *cmd; 2099 struct iscsi_logout *hdr; 2100 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2101 2102 hdr = (struct iscsi_logout *) buf; 2103 reason_code = (hdr->flags & 0x7f); 2104 2105 if (tiqn) { 2106 spin_lock(&tiqn->logout_stats.lock); 2107 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2108 tiqn->logout_stats.normal_logouts++; 2109 else 2110 tiqn->logout_stats.abnormal_logouts++; 2111 spin_unlock(&tiqn->logout_stats.lock); 2112 } 2113 2114 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2115 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2116 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2117 hdr->cid, conn->cid); 2118 2119 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2120 pr_err("Received logout request on connection that" 2121 " is not in logged in state, ignoring request.\n"); 2122 return 0; 2123 } 2124 2125 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 2126 if (!cmd) 2127 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, 2128 buf, conn); 2129 2130 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2131 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2132 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2133 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2134 cmd->targ_xfer_tag = 0xFFFFFFFF; 2135 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2136 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2137 cmd->logout_cid = be16_to_cpu(hdr->cid); 2138 cmd->logout_reason = reason_code; 2139 cmd->data_direction = DMA_NONE; 2140 2141 /* 2142 * We need to sleep in these cases (by returning 1) until the Logout 2143 * Response gets sent in the tx thread. 2144 */ 2145 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2146 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2147 be16_to_cpu(hdr->cid) == conn->cid)) 2148 logout_remove = 1; 2149 2150 spin_lock_bh(&conn->cmd_lock); 2151 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2152 spin_unlock_bh(&conn->cmd_lock); 2153 2154 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2155 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2156 2157 /* 2158 * Immediate commands are executed, well, immediately. 2159 * Non-Immediate Logout Commands are executed in CmdSN order. 2160 */ 2161 if (cmd->immediate_cmd) { 2162 int ret = iscsit_execute_cmd(cmd, 0); 2163 2164 if (ret < 0) 2165 return ret; 2166 } else { 2167 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 2168 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2169 logout_remove = 0; 2170 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2171 return iscsit_add_reject_from_cmd( 2172 ISCSI_REASON_PROTOCOL_ERROR, 2173 1, 0, buf, cmd); 2174 } 2175 } 2176 2177 return logout_remove; 2178 } 2179 2180 static int iscsit_handle_snack( 2181 struct iscsi_conn *conn, 2182 unsigned char *buf) 2183 { 2184 struct iscsi_snack *hdr; 2185 2186 hdr = (struct iscsi_snack *) buf; 2187 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2188 2189 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2190 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2191 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2192 hdr->begrun, hdr->runlength, conn->cid); 2193 2194 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2195 pr_err("Initiator sent SNACK request while in" 2196 " ErrorRecoveryLevel=0.\n"); 2197 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2198 buf, conn); 2199 } 2200 /* 2201 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2202 * call from inside iscsi_send_recovery_datain_or_r2t(). 2203 */ 2204 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2205 case 0: 2206 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2207 hdr->itt, 2208 be32_to_cpu(hdr->ttt), 2209 be32_to_cpu(hdr->begrun), 2210 be32_to_cpu(hdr->runlength)); 2211 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2212 return iscsit_handle_status_snack(conn, hdr->itt, 2213 be32_to_cpu(hdr->ttt), 2214 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2215 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2216 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2217 be32_to_cpu(hdr->begrun), 2218 be32_to_cpu(hdr->runlength)); 2219 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2220 /* FIXME: Support R-Data SNACK */ 2221 pr_err("R-Data SNACK Not Supported.\n"); 2222 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2223 buf, conn); 2224 default: 2225 pr_err("Unknown SNACK type 0x%02x, protocol" 2226 " error.\n", hdr->flags & 0x0f); 2227 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2228 buf, conn); 2229 } 2230 2231 return 0; 2232 } 2233 2234 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2235 { 2236 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2237 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2238 wait_for_completion_interruptible_timeout( 2239 &conn->rx_half_close_comp, 2240 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2241 } 2242 } 2243 2244 static int iscsit_handle_immediate_data( 2245 struct iscsi_cmd *cmd, 2246 unsigned char *buf, 2247 u32 length) 2248 { 2249 int iov_ret, rx_got = 0, rx_size = 0; 2250 u32 checksum, iov_count = 0, padding = 0; 2251 struct iscsi_conn *conn = cmd->conn; 2252 struct kvec *iov; 2253 2254 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2255 if (iov_ret < 0) 2256 return IMMEDIATE_DATA_CANNOT_RECOVER; 2257 2258 rx_size = length; 2259 iov_count = iov_ret; 2260 iov = &cmd->iov_data[0]; 2261 2262 padding = ((-length) & 3); 2263 if (padding != 0) { 2264 iov[iov_count].iov_base = cmd->pad_bytes; 2265 iov[iov_count++].iov_len = padding; 2266 rx_size += padding; 2267 } 2268 2269 if (conn->conn_ops->DataDigest) { 2270 iov[iov_count].iov_base = &checksum; 2271 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2272 rx_size += ISCSI_CRC_LEN; 2273 } 2274 2275 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2276 2277 iscsit_unmap_iovec(cmd); 2278 2279 if (rx_got != rx_size) { 2280 iscsit_rx_thread_wait_for_tcp(conn); 2281 return IMMEDIATE_DATA_CANNOT_RECOVER; 2282 } 2283 2284 if (conn->conn_ops->DataDigest) { 2285 u32 data_crc; 2286 2287 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2288 cmd->write_data_done, length, padding, 2289 cmd->pad_bytes); 2290 2291 if (checksum != data_crc) { 2292 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2293 " does not match computed 0x%08x\n", checksum, 2294 data_crc); 2295 2296 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2297 pr_err("Unable to recover from" 2298 " Immediate Data digest failure while" 2299 " in ERL=0.\n"); 2300 iscsit_add_reject_from_cmd( 2301 ISCSI_REASON_DATA_DIGEST_ERROR, 2302 1, 0, buf, cmd); 2303 return IMMEDIATE_DATA_CANNOT_RECOVER; 2304 } else { 2305 iscsit_add_reject_from_cmd( 2306 ISCSI_REASON_DATA_DIGEST_ERROR, 2307 0, 0, buf, cmd); 2308 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2309 } 2310 } else { 2311 pr_debug("Got CRC32C DataDigest 0x%08x for" 2312 " %u bytes of Immediate Data\n", checksum, 2313 length); 2314 } 2315 } 2316 2317 cmd->write_data_done += length; 2318 2319 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2320 spin_lock_bh(&cmd->istate_lock); 2321 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2322 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2323 spin_unlock_bh(&cmd->istate_lock); 2324 } 2325 2326 return IMMEDIATE_DATA_NORMAL_OPERATION; 2327 } 2328 2329 /* 2330 * Called with sess->conn_lock held. 2331 */ 2332 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2333 with active network interface */ 2334 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2335 { 2336 struct iscsi_cmd *cmd; 2337 struct iscsi_conn *conn_p; 2338 2339 /* 2340 * Only send a Asynchronous Message on connections whos network 2341 * interface is still functional. 2342 */ 2343 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2344 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2345 iscsit_inc_conn_usage_count(conn_p); 2346 break; 2347 } 2348 } 2349 2350 if (!conn_p) 2351 return; 2352 2353 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC); 2354 if (!cmd) { 2355 iscsit_dec_conn_usage_count(conn_p); 2356 return; 2357 } 2358 2359 cmd->logout_cid = conn->cid; 2360 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2361 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2362 2363 spin_lock_bh(&conn_p->cmd_lock); 2364 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2365 spin_unlock_bh(&conn_p->cmd_lock); 2366 2367 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2368 iscsit_dec_conn_usage_count(conn_p); 2369 } 2370 2371 static int iscsit_send_conn_drop_async_message( 2372 struct iscsi_cmd *cmd, 2373 struct iscsi_conn *conn) 2374 { 2375 struct iscsi_async *hdr; 2376 2377 cmd->tx_size = ISCSI_HDR_LEN; 2378 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2379 2380 hdr = (struct iscsi_async *) cmd->pdu; 2381 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2382 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2383 cmd->init_task_tag = RESERVED_ITT; 2384 cmd->targ_xfer_tag = 0xFFFFFFFF; 2385 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2386 cmd->stat_sn = conn->stat_sn++; 2387 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2388 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2389 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2390 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2391 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2392 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2393 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2394 2395 if (conn->conn_ops->HeaderDigest) { 2396 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2397 2398 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2399 (unsigned char *)hdr, ISCSI_HDR_LEN, 2400 0, NULL, (u8 *)header_digest); 2401 2402 cmd->tx_size += ISCSI_CRC_LEN; 2403 pr_debug("Attaching CRC32C HeaderDigest to" 2404 " Async Message 0x%08x\n", *header_digest); 2405 } 2406 2407 cmd->iov_misc[0].iov_base = cmd->pdu; 2408 cmd->iov_misc[0].iov_len = cmd->tx_size; 2409 cmd->iov_misc_count = 1; 2410 2411 pr_debug("Sending Connection Dropped Async Message StatSN:" 2412 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2413 cmd->logout_cid, conn->cid); 2414 return 0; 2415 } 2416 2417 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2418 { 2419 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2420 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2421 wait_for_completion_interruptible_timeout( 2422 &conn->tx_half_close_comp, 2423 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2424 } 2425 } 2426 2427 static int iscsit_send_data_in( 2428 struct iscsi_cmd *cmd, 2429 struct iscsi_conn *conn) 2430 { 2431 int iov_ret = 0, set_statsn = 0; 2432 u32 iov_count = 0, tx_size = 0; 2433 struct iscsi_datain datain; 2434 struct iscsi_datain_req *dr; 2435 struct iscsi_data_rsp *hdr; 2436 struct kvec *iov; 2437 int eodr = 0; 2438 int ret; 2439 2440 memset(&datain, 0, sizeof(struct iscsi_datain)); 2441 dr = iscsit_get_datain_values(cmd, &datain); 2442 if (!dr) { 2443 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2444 cmd->init_task_tag); 2445 return -1; 2446 } 2447 2448 /* 2449 * Be paranoid and double check the logic for now. 2450 */ 2451 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2452 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2453 " datain.length: %u exceeds cmd->data_length: %u\n", 2454 cmd->init_task_tag, datain.offset, datain.length, 2455 cmd->se_cmd.data_length); 2456 return -1; 2457 } 2458 2459 spin_lock_bh(&conn->sess->session_stats_lock); 2460 conn->sess->tx_data_octets += datain.length; 2461 if (conn->sess->se_sess->se_node_acl) { 2462 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 2463 conn->sess->se_sess->se_node_acl->read_bytes += datain.length; 2464 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 2465 } 2466 spin_unlock_bh(&conn->sess->session_stats_lock); 2467 /* 2468 * Special case for successfully execution w/ both DATAIN 2469 * and Sense Data. 2470 */ 2471 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2472 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2473 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2474 else { 2475 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2476 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2477 iscsit_increment_maxcmdsn(cmd, conn->sess); 2478 cmd->stat_sn = conn->stat_sn++; 2479 set_statsn = 1; 2480 } else if (dr->dr_complete == 2481 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2482 set_statsn = 1; 2483 } 2484 2485 hdr = (struct iscsi_data_rsp *) cmd->pdu; 2486 memset(hdr, 0, ISCSI_HDR_LEN); 2487 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2488 hdr->flags = datain.flags; 2489 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2490 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2491 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2492 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2493 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2494 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2495 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2496 } 2497 } 2498 hton24(hdr->dlength, datain.length); 2499 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2500 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2501 (struct scsi_lun *)&hdr->lun); 2502 else 2503 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2504 2505 hdr->itt = cmd->init_task_tag; 2506 2507 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2508 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2509 else 2510 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2511 if (set_statsn) 2512 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2513 else 2514 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2515 2516 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2517 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2518 hdr->datasn = cpu_to_be32(datain.data_sn); 2519 hdr->offset = cpu_to_be32(datain.offset); 2520 2521 iov = &cmd->iov_data[0]; 2522 iov[iov_count].iov_base = cmd->pdu; 2523 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2524 tx_size += ISCSI_HDR_LEN; 2525 2526 if (conn->conn_ops->HeaderDigest) { 2527 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2528 2529 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2530 (unsigned char *)hdr, ISCSI_HDR_LEN, 2531 0, NULL, (u8 *)header_digest); 2532 2533 iov[0].iov_len += ISCSI_CRC_LEN; 2534 tx_size += ISCSI_CRC_LEN; 2535 2536 pr_debug("Attaching CRC32 HeaderDigest" 2537 " for DataIN PDU 0x%08x\n", *header_digest); 2538 } 2539 2540 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length); 2541 if (iov_ret < 0) 2542 return -1; 2543 2544 iov_count += iov_ret; 2545 tx_size += datain.length; 2546 2547 cmd->padding = ((-datain.length) & 3); 2548 if (cmd->padding) { 2549 iov[iov_count].iov_base = cmd->pad_bytes; 2550 iov[iov_count++].iov_len = cmd->padding; 2551 tx_size += cmd->padding; 2552 2553 pr_debug("Attaching %u padding bytes\n", 2554 cmd->padding); 2555 } 2556 if (conn->conn_ops->DataDigest) { 2557 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2558 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2559 2560 iov[iov_count].iov_base = &cmd->data_crc; 2561 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2562 tx_size += ISCSI_CRC_LEN; 2563 2564 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2565 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2566 } 2567 2568 cmd->iov_data_count = iov_count; 2569 cmd->tx_size = tx_size; 2570 2571 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2572 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2573 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2574 ntohl(hdr->offset), datain.length, conn->cid); 2575 2576 /* sendpage is preferred but can't insert markers */ 2577 if (!conn->conn_ops->IFMarker) 2578 ret = iscsit_fe_sendpage_sg(cmd, conn); 2579 else 2580 ret = iscsit_send_tx_data(cmd, conn, 0); 2581 2582 iscsit_unmap_iovec(cmd); 2583 2584 if (ret < 0) { 2585 iscsit_tx_thread_wait_for_tcp(conn); 2586 return ret; 2587 } 2588 2589 if (dr->dr_complete) { 2590 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2591 2 : 1; 2592 iscsit_free_datain_req(cmd, dr); 2593 } 2594 2595 return eodr; 2596 } 2597 2598 static int iscsit_send_logout_response( 2599 struct iscsi_cmd *cmd, 2600 struct iscsi_conn *conn) 2601 { 2602 int niov = 0, tx_size; 2603 struct iscsi_conn *logout_conn = NULL; 2604 struct iscsi_conn_recovery *cr = NULL; 2605 struct iscsi_session *sess = conn->sess; 2606 struct kvec *iov; 2607 struct iscsi_logout_rsp *hdr; 2608 /* 2609 * The actual shutting down of Sessions and/or Connections 2610 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2611 * is done in scsi_logout_post_handler(). 2612 */ 2613 switch (cmd->logout_reason) { 2614 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2615 pr_debug("iSCSI session logout successful, setting" 2616 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2617 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2618 break; 2619 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2620 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2621 break; 2622 /* 2623 * For CLOSECONNECTION logout requests carrying 2624 * a matching logout CID -> local CID, the reference 2625 * for the local CID will have been incremented in 2626 * iscsi_logout_closeconnection(). 2627 * 2628 * For CLOSECONNECTION logout requests carrying 2629 * a different CID than the connection it arrived 2630 * on, the connection responding to cmd->logout_cid 2631 * is stopped in iscsit_logout_post_handler_diffcid(). 2632 */ 2633 2634 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2635 " successful.\n", cmd->logout_cid, conn->cid); 2636 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2637 break; 2638 case ISCSI_LOGOUT_REASON_RECOVERY: 2639 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2640 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2641 break; 2642 /* 2643 * If the connection is still active from our point of view 2644 * force connection recovery to occur. 2645 */ 2646 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2647 cmd->logout_cid); 2648 if (logout_conn) { 2649 iscsit_connection_reinstatement_rcfr(logout_conn); 2650 iscsit_dec_conn_usage_count(logout_conn); 2651 } 2652 2653 cr = iscsit_get_inactive_connection_recovery_entry( 2654 conn->sess, cmd->logout_cid); 2655 if (!cr) { 2656 pr_err("Unable to locate CID: %hu for" 2657 " REMOVECONNFORRECOVERY Logout Request.\n", 2658 cmd->logout_cid); 2659 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2660 break; 2661 } 2662 2663 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2664 2665 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2666 " for recovery for CID: %hu on CID: %hu successful.\n", 2667 cmd->logout_cid, conn->cid); 2668 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2669 break; 2670 default: 2671 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2672 cmd->logout_reason); 2673 return -1; 2674 } 2675 2676 tx_size = ISCSI_HDR_LEN; 2677 hdr = (struct iscsi_logout_rsp *)cmd->pdu; 2678 memset(hdr, 0, ISCSI_HDR_LEN); 2679 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2680 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2681 hdr->response = cmd->logout_response; 2682 hdr->itt = cmd->init_task_tag; 2683 cmd->stat_sn = conn->stat_sn++; 2684 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2685 2686 iscsit_increment_maxcmdsn(cmd, conn->sess); 2687 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2688 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2689 2690 iov = &cmd->iov_misc[0]; 2691 iov[niov].iov_base = cmd->pdu; 2692 iov[niov++].iov_len = ISCSI_HDR_LEN; 2693 2694 if (conn->conn_ops->HeaderDigest) { 2695 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2696 2697 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2698 (unsigned char *)hdr, ISCSI_HDR_LEN, 2699 0, NULL, (u8 *)header_digest); 2700 2701 iov[0].iov_len += ISCSI_CRC_LEN; 2702 tx_size += ISCSI_CRC_LEN; 2703 pr_debug("Attaching CRC32C HeaderDigest to" 2704 " Logout Response 0x%08x\n", *header_digest); 2705 } 2706 cmd->iov_misc_count = niov; 2707 cmd->tx_size = tx_size; 2708 2709 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:" 2710 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2711 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2712 cmd->logout_cid, conn->cid); 2713 2714 return 0; 2715 } 2716 2717 /* 2718 * Unsolicited NOPIN, either requesting a response or not. 2719 */ 2720 static int iscsit_send_unsolicited_nopin( 2721 struct iscsi_cmd *cmd, 2722 struct iscsi_conn *conn, 2723 int want_response) 2724 { 2725 int tx_size = ISCSI_HDR_LEN; 2726 struct iscsi_nopin *hdr; 2727 int ret; 2728 2729 hdr = (struct iscsi_nopin *) cmd->pdu; 2730 memset(hdr, 0, ISCSI_HDR_LEN); 2731 hdr->opcode = ISCSI_OP_NOOP_IN; 2732 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2733 hdr->itt = cmd->init_task_tag; 2734 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2735 cmd->stat_sn = conn->stat_sn; 2736 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2737 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2738 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2739 2740 if (conn->conn_ops->HeaderDigest) { 2741 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2742 2743 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2744 (unsigned char *)hdr, ISCSI_HDR_LEN, 2745 0, NULL, (u8 *)header_digest); 2746 2747 tx_size += ISCSI_CRC_LEN; 2748 pr_debug("Attaching CRC32C HeaderDigest to" 2749 " NopIN 0x%08x\n", *header_digest); 2750 } 2751 2752 cmd->iov_misc[0].iov_base = cmd->pdu; 2753 cmd->iov_misc[0].iov_len = tx_size; 2754 cmd->iov_misc_count = 1; 2755 cmd->tx_size = tx_size; 2756 2757 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2758 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2759 2760 ret = iscsit_send_tx_data(cmd, conn, 1); 2761 if (ret < 0) { 2762 iscsit_tx_thread_wait_for_tcp(conn); 2763 return ret; 2764 } 2765 2766 spin_lock_bh(&cmd->istate_lock); 2767 cmd->i_state = want_response ? 2768 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2769 spin_unlock_bh(&cmd->istate_lock); 2770 2771 return 0; 2772 } 2773 2774 static int iscsit_send_nopin_response( 2775 struct iscsi_cmd *cmd, 2776 struct iscsi_conn *conn) 2777 { 2778 int niov = 0, tx_size; 2779 u32 padding = 0; 2780 struct kvec *iov; 2781 struct iscsi_nopin *hdr; 2782 2783 tx_size = ISCSI_HDR_LEN; 2784 hdr = (struct iscsi_nopin *) cmd->pdu; 2785 memset(hdr, 0, ISCSI_HDR_LEN); 2786 hdr->opcode = ISCSI_OP_NOOP_IN; 2787 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2788 hton24(hdr->dlength, cmd->buf_ptr_size); 2789 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2790 hdr->itt = cmd->init_task_tag; 2791 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2792 cmd->stat_sn = conn->stat_sn++; 2793 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2794 2795 iscsit_increment_maxcmdsn(cmd, conn->sess); 2796 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2797 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2798 2799 iov = &cmd->iov_misc[0]; 2800 iov[niov].iov_base = cmd->pdu; 2801 iov[niov++].iov_len = ISCSI_HDR_LEN; 2802 2803 if (conn->conn_ops->HeaderDigest) { 2804 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2805 2806 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2807 (unsigned char *)hdr, ISCSI_HDR_LEN, 2808 0, NULL, (u8 *)header_digest); 2809 2810 iov[0].iov_len += ISCSI_CRC_LEN; 2811 tx_size += ISCSI_CRC_LEN; 2812 pr_debug("Attaching CRC32C HeaderDigest" 2813 " to NopIn 0x%08x\n", *header_digest); 2814 } 2815 2816 /* 2817 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2818 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2819 */ 2820 if (cmd->buf_ptr_size) { 2821 iov[niov].iov_base = cmd->buf_ptr; 2822 iov[niov++].iov_len = cmd->buf_ptr_size; 2823 tx_size += cmd->buf_ptr_size; 2824 2825 pr_debug("Echoing back %u bytes of ping" 2826 " data.\n", cmd->buf_ptr_size); 2827 2828 padding = ((-cmd->buf_ptr_size) & 3); 2829 if (padding != 0) { 2830 iov[niov].iov_base = &cmd->pad_bytes; 2831 iov[niov++].iov_len = padding; 2832 tx_size += padding; 2833 pr_debug("Attaching %u additional" 2834 " padding bytes.\n", padding); 2835 } 2836 if (conn->conn_ops->DataDigest) { 2837 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2838 cmd->buf_ptr, cmd->buf_ptr_size, 2839 padding, (u8 *)&cmd->pad_bytes, 2840 (u8 *)&cmd->data_crc); 2841 2842 iov[niov].iov_base = &cmd->data_crc; 2843 iov[niov++].iov_len = ISCSI_CRC_LEN; 2844 tx_size += ISCSI_CRC_LEN; 2845 pr_debug("Attached DataDigest for %u" 2846 " bytes of ping data, CRC 0x%08x\n", 2847 cmd->buf_ptr_size, cmd->data_crc); 2848 } 2849 } 2850 2851 cmd->iov_misc_count = niov; 2852 cmd->tx_size = tx_size; 2853 2854 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:" 2855 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag, 2856 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2857 2858 return 0; 2859 } 2860 2861 static int iscsit_send_r2t( 2862 struct iscsi_cmd *cmd, 2863 struct iscsi_conn *conn) 2864 { 2865 int tx_size = 0; 2866 struct iscsi_r2t *r2t; 2867 struct iscsi_r2t_rsp *hdr; 2868 int ret; 2869 2870 r2t = iscsit_get_r2t_from_list(cmd); 2871 if (!r2t) 2872 return -1; 2873 2874 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 2875 memset(hdr, 0, ISCSI_HDR_LEN); 2876 hdr->opcode = ISCSI_OP_R2T; 2877 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2878 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2879 (struct scsi_lun *)&hdr->lun); 2880 hdr->itt = cmd->init_task_tag; 2881 spin_lock_bh(&conn->sess->ttt_lock); 2882 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 2883 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 2884 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 2885 spin_unlock_bh(&conn->sess->ttt_lock); 2886 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 2887 hdr->statsn = cpu_to_be32(conn->stat_sn); 2888 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2889 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2890 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 2891 hdr->data_offset = cpu_to_be32(r2t->offset); 2892 hdr->data_length = cpu_to_be32(r2t->xfer_len); 2893 2894 cmd->iov_misc[0].iov_base = cmd->pdu; 2895 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 2896 tx_size += ISCSI_HDR_LEN; 2897 2898 if (conn->conn_ops->HeaderDigest) { 2899 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2900 2901 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2902 (unsigned char *)hdr, ISCSI_HDR_LEN, 2903 0, NULL, (u8 *)header_digest); 2904 2905 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 2906 tx_size += ISCSI_CRC_LEN; 2907 pr_debug("Attaching CRC32 HeaderDigest for R2T" 2908 " PDU 0x%08x\n", *header_digest); 2909 } 2910 2911 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 2912 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 2913 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 2914 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 2915 r2t->offset, r2t->xfer_len, conn->cid); 2916 2917 cmd->iov_misc_count = 1; 2918 cmd->tx_size = tx_size; 2919 2920 spin_lock_bh(&cmd->r2t_lock); 2921 r2t->sent_r2t = 1; 2922 spin_unlock_bh(&cmd->r2t_lock); 2923 2924 ret = iscsit_send_tx_data(cmd, conn, 1); 2925 if (ret < 0) { 2926 iscsit_tx_thread_wait_for_tcp(conn); 2927 return ret; 2928 } 2929 2930 spin_lock_bh(&cmd->dataout_timeout_lock); 2931 iscsit_start_dataout_timer(cmd, conn); 2932 spin_unlock_bh(&cmd->dataout_timeout_lock); 2933 2934 return 0; 2935 } 2936 2937 /* 2938 * @recovery: If called from iscsi_task_reassign_complete_write() for 2939 * connection recovery. 2940 */ 2941 int iscsit_build_r2ts_for_cmd( 2942 struct iscsi_cmd *cmd, 2943 struct iscsi_conn *conn, 2944 bool recovery) 2945 { 2946 int first_r2t = 1; 2947 u32 offset = 0, xfer_len = 0; 2948 2949 spin_lock_bh(&cmd->r2t_lock); 2950 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 2951 spin_unlock_bh(&cmd->r2t_lock); 2952 return 0; 2953 } 2954 2955 if (conn->sess->sess_ops->DataSequenceInOrder && 2956 !recovery) 2957 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 2958 2959 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 2960 if (conn->sess->sess_ops->DataSequenceInOrder) { 2961 offset = cmd->r2t_offset; 2962 2963 if (first_r2t && recovery) { 2964 int new_data_end = offset + 2965 conn->sess->sess_ops->MaxBurstLength - 2966 cmd->next_burst_len; 2967 2968 if (new_data_end > cmd->se_cmd.data_length) 2969 xfer_len = cmd->se_cmd.data_length - offset; 2970 else 2971 xfer_len = 2972 conn->sess->sess_ops->MaxBurstLength - 2973 cmd->next_burst_len; 2974 } else { 2975 int new_data_end = offset + 2976 conn->sess->sess_ops->MaxBurstLength; 2977 2978 if (new_data_end > cmd->se_cmd.data_length) 2979 xfer_len = cmd->se_cmd.data_length - offset; 2980 else 2981 xfer_len = conn->sess->sess_ops->MaxBurstLength; 2982 } 2983 cmd->r2t_offset += xfer_len; 2984 2985 if (cmd->r2t_offset == cmd->se_cmd.data_length) 2986 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 2987 } else { 2988 struct iscsi_seq *seq; 2989 2990 seq = iscsit_get_seq_holder_for_r2t(cmd); 2991 if (!seq) { 2992 spin_unlock_bh(&cmd->r2t_lock); 2993 return -1; 2994 } 2995 2996 offset = seq->offset; 2997 xfer_len = seq->xfer_len; 2998 2999 if (cmd->seq_send_order == cmd->seq_count) 3000 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3001 } 3002 cmd->outstanding_r2ts++; 3003 first_r2t = 0; 3004 3005 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3006 spin_unlock_bh(&cmd->r2t_lock); 3007 return -1; 3008 } 3009 3010 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3011 break; 3012 } 3013 spin_unlock_bh(&cmd->r2t_lock); 3014 3015 return 0; 3016 } 3017 3018 static int iscsit_send_status( 3019 struct iscsi_cmd *cmd, 3020 struct iscsi_conn *conn) 3021 { 3022 u8 iov_count = 0, recovery; 3023 u32 padding = 0, tx_size = 0; 3024 struct iscsi_scsi_rsp *hdr; 3025 struct kvec *iov; 3026 3027 recovery = (cmd->i_state != ISTATE_SEND_STATUS); 3028 if (!recovery) 3029 cmd->stat_sn = conn->stat_sn++; 3030 3031 spin_lock_bh(&conn->sess->session_stats_lock); 3032 conn->sess->rsp_pdus++; 3033 spin_unlock_bh(&conn->sess->session_stats_lock); 3034 3035 hdr = (struct iscsi_scsi_rsp *) cmd->pdu; 3036 memset(hdr, 0, ISCSI_HDR_LEN); 3037 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3038 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3039 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3040 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3041 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3042 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3043 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3044 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3045 } 3046 hdr->response = cmd->iscsi_response; 3047 hdr->cmd_status = cmd->se_cmd.scsi_status; 3048 hdr->itt = cmd->init_task_tag; 3049 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3050 3051 iscsit_increment_maxcmdsn(cmd, conn->sess); 3052 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3053 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3054 3055 iov = &cmd->iov_misc[0]; 3056 iov[iov_count].iov_base = cmd->pdu; 3057 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3058 tx_size += ISCSI_HDR_LEN; 3059 3060 /* 3061 * Attach SENSE DATA payload to iSCSI Response PDU 3062 */ 3063 if (cmd->se_cmd.sense_buffer && 3064 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3065 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3066 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3067 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3068 3069 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3070 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3071 iov[iov_count].iov_base = cmd->sense_buffer; 3072 iov[iov_count++].iov_len = 3073 (cmd->se_cmd.scsi_sense_length + padding); 3074 tx_size += cmd->se_cmd.scsi_sense_length; 3075 3076 if (padding) { 3077 memset(cmd->sense_buffer + 3078 cmd->se_cmd.scsi_sense_length, 0, padding); 3079 tx_size += padding; 3080 pr_debug("Adding %u bytes of padding to" 3081 " SENSE.\n", padding); 3082 } 3083 3084 if (conn->conn_ops->DataDigest) { 3085 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3086 cmd->sense_buffer, 3087 (cmd->se_cmd.scsi_sense_length + padding), 3088 0, NULL, (u8 *)&cmd->data_crc); 3089 3090 iov[iov_count].iov_base = &cmd->data_crc; 3091 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3092 tx_size += ISCSI_CRC_LEN; 3093 3094 pr_debug("Attaching CRC32 DataDigest for" 3095 " SENSE, %u bytes CRC 0x%08x\n", 3096 (cmd->se_cmd.scsi_sense_length + padding), 3097 cmd->data_crc); 3098 } 3099 3100 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3101 " Response PDU\n", 3102 cmd->se_cmd.scsi_sense_length); 3103 } 3104 3105 if (conn->conn_ops->HeaderDigest) { 3106 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3107 3108 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3109 (unsigned char *)hdr, ISCSI_HDR_LEN, 3110 0, NULL, (u8 *)header_digest); 3111 3112 iov[0].iov_len += ISCSI_CRC_LEN; 3113 tx_size += ISCSI_CRC_LEN; 3114 pr_debug("Attaching CRC32 HeaderDigest for Response" 3115 " PDU 0x%08x\n", *header_digest); 3116 } 3117 3118 cmd->iov_misc_count = iov_count; 3119 cmd->tx_size = tx_size; 3120 3121 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3122 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3123 (!recovery) ? "" : "Recovery ", cmd->init_task_tag, 3124 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid); 3125 3126 return 0; 3127 } 3128 3129 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3130 { 3131 switch (se_tmr->response) { 3132 case TMR_FUNCTION_COMPLETE: 3133 return ISCSI_TMF_RSP_COMPLETE; 3134 case TMR_TASK_DOES_NOT_EXIST: 3135 return ISCSI_TMF_RSP_NO_TASK; 3136 case TMR_LUN_DOES_NOT_EXIST: 3137 return ISCSI_TMF_RSP_NO_LUN; 3138 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3139 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3140 case TMR_FUNCTION_AUTHORIZATION_FAILED: 3141 return ISCSI_TMF_RSP_AUTH_FAILED; 3142 case TMR_FUNCTION_REJECTED: 3143 default: 3144 return ISCSI_TMF_RSP_REJECTED; 3145 } 3146 } 3147 3148 static int iscsit_send_task_mgt_rsp( 3149 struct iscsi_cmd *cmd, 3150 struct iscsi_conn *conn) 3151 { 3152 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3153 struct iscsi_tm_rsp *hdr; 3154 u32 tx_size = 0; 3155 3156 hdr = (struct iscsi_tm_rsp *) cmd->pdu; 3157 memset(hdr, 0, ISCSI_HDR_LEN); 3158 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3159 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3160 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3161 hdr->itt = cmd->init_task_tag; 3162 cmd->stat_sn = conn->stat_sn++; 3163 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3164 3165 iscsit_increment_maxcmdsn(cmd, conn->sess); 3166 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3167 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3168 3169 cmd->iov_misc[0].iov_base = cmd->pdu; 3170 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3171 tx_size += ISCSI_HDR_LEN; 3172 3173 if (conn->conn_ops->HeaderDigest) { 3174 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3175 3176 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3177 (unsigned char *)hdr, ISCSI_HDR_LEN, 3178 0, NULL, (u8 *)header_digest); 3179 3180 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3181 tx_size += ISCSI_CRC_LEN; 3182 pr_debug("Attaching CRC32 HeaderDigest for Task" 3183 " Mgmt Response PDU 0x%08x\n", *header_digest); 3184 } 3185 3186 cmd->iov_misc_count = 1; 3187 cmd->tx_size = tx_size; 3188 3189 pr_debug("Built Task Management Response ITT: 0x%08x," 3190 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3191 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3192 3193 return 0; 3194 } 3195 3196 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3197 { 3198 bool ret = false; 3199 3200 if (np->np_sockaddr.ss_family == AF_INET6) { 3201 const struct sockaddr_in6 sin6 = { 3202 .sin6_addr = IN6ADDR_ANY_INIT }; 3203 struct sockaddr_in6 *sock_in6 = 3204 (struct sockaddr_in6 *)&np->np_sockaddr; 3205 3206 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3207 sin6.sin6_addr.s6_addr, 16)) 3208 ret = true; 3209 } else { 3210 struct sockaddr_in * sock_in = 3211 (struct sockaddr_in *)&np->np_sockaddr; 3212 3213 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3214 ret = true; 3215 } 3216 3217 return ret; 3218 } 3219 3220 #define SENDTARGETS_BUF_LIMIT 32768U 3221 3222 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) 3223 { 3224 char *payload = NULL; 3225 struct iscsi_conn *conn = cmd->conn; 3226 struct iscsi_portal_group *tpg; 3227 struct iscsi_tiqn *tiqn; 3228 struct iscsi_tpg_np *tpg_np; 3229 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3230 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3231 3232 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3233 SENDTARGETS_BUF_LIMIT); 3234 3235 payload = kzalloc(buffer_len, GFP_KERNEL); 3236 if (!payload) { 3237 pr_err("Unable to allocate memory for sendtargets" 3238 " response.\n"); 3239 return -ENOMEM; 3240 } 3241 3242 spin_lock(&tiqn_lock); 3243 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3244 len = sprintf(buf, "TargetName=%s", tiqn->tiqn); 3245 len += 1; 3246 3247 if ((len + payload_len) > buffer_len) { 3248 end_of_buf = 1; 3249 goto eob; 3250 } 3251 memcpy(payload + payload_len, buf, len); 3252 payload_len += len; 3253 3254 spin_lock(&tiqn->tiqn_tpg_lock); 3255 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3256 3257 spin_lock(&tpg->tpg_state_lock); 3258 if ((tpg->tpg_state == TPG_STATE_FREE) || 3259 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3260 spin_unlock(&tpg->tpg_state_lock); 3261 continue; 3262 } 3263 spin_unlock(&tpg->tpg_state_lock); 3264 3265 spin_lock(&tpg->tpg_np_lock); 3266 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3267 tpg_np_list) { 3268 struct iscsi_np *np = tpg_np->tpg_np; 3269 bool inaddr_any = iscsit_check_inaddr_any(np); 3270 3271 len = sprintf(buf, "TargetAddress=" 3272 "%s%s%s:%hu,%hu", 3273 (np->np_sockaddr.ss_family == AF_INET6) ? 3274 "[" : "", (inaddr_any == false) ? 3275 np->np_ip : conn->local_ip, 3276 (np->np_sockaddr.ss_family == AF_INET6) ? 3277 "]" : "", (inaddr_any == false) ? 3278 np->np_port : conn->local_port, 3279 tpg->tpgt); 3280 len += 1; 3281 3282 if ((len + payload_len) > buffer_len) { 3283 spin_unlock(&tpg->tpg_np_lock); 3284 spin_unlock(&tiqn->tiqn_tpg_lock); 3285 end_of_buf = 1; 3286 goto eob; 3287 } 3288 memcpy(payload + payload_len, buf, len); 3289 payload_len += len; 3290 } 3291 spin_unlock(&tpg->tpg_np_lock); 3292 } 3293 spin_unlock(&tiqn->tiqn_tpg_lock); 3294 eob: 3295 if (end_of_buf) 3296 break; 3297 } 3298 spin_unlock(&tiqn_lock); 3299 3300 cmd->buf_ptr = payload; 3301 3302 return payload_len; 3303 } 3304 3305 /* 3306 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3307 * MaxRecvDataSegmentLength. 3308 */ 3309 static int iscsit_send_text_rsp( 3310 struct iscsi_cmd *cmd, 3311 struct iscsi_conn *conn) 3312 { 3313 struct iscsi_text_rsp *hdr; 3314 struct kvec *iov; 3315 u32 padding = 0, tx_size = 0; 3316 int text_length, iov_count = 0; 3317 3318 text_length = iscsit_build_sendtargets_response(cmd); 3319 if (text_length < 0) 3320 return text_length; 3321 3322 padding = ((-text_length) & 3); 3323 if (padding != 0) { 3324 memset(cmd->buf_ptr + text_length, 0, padding); 3325 pr_debug("Attaching %u additional bytes for" 3326 " padding.\n", padding); 3327 } 3328 3329 hdr = (struct iscsi_text_rsp *) cmd->pdu; 3330 memset(hdr, 0, ISCSI_HDR_LEN); 3331 hdr->opcode = ISCSI_OP_TEXT_RSP; 3332 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3333 hton24(hdr->dlength, text_length); 3334 hdr->itt = cmd->init_task_tag; 3335 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3336 cmd->stat_sn = conn->stat_sn++; 3337 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3338 3339 iscsit_increment_maxcmdsn(cmd, conn->sess); 3340 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3341 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3342 3343 iov = &cmd->iov_misc[0]; 3344 3345 iov[iov_count].iov_base = cmd->pdu; 3346 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3347 iov[iov_count].iov_base = cmd->buf_ptr; 3348 iov[iov_count++].iov_len = text_length + padding; 3349 3350 tx_size += (ISCSI_HDR_LEN + text_length + padding); 3351 3352 if (conn->conn_ops->HeaderDigest) { 3353 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3354 3355 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3356 (unsigned char *)hdr, ISCSI_HDR_LEN, 3357 0, NULL, (u8 *)header_digest); 3358 3359 iov[0].iov_len += ISCSI_CRC_LEN; 3360 tx_size += ISCSI_CRC_LEN; 3361 pr_debug("Attaching CRC32 HeaderDigest for" 3362 " Text Response PDU 0x%08x\n", *header_digest); 3363 } 3364 3365 if (conn->conn_ops->DataDigest) { 3366 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3367 cmd->buf_ptr, (text_length + padding), 3368 0, NULL, (u8 *)&cmd->data_crc); 3369 3370 iov[iov_count].iov_base = &cmd->data_crc; 3371 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3372 tx_size += ISCSI_CRC_LEN; 3373 3374 pr_debug("Attaching DataDigest for %u bytes of text" 3375 " data, CRC 0x%08x\n", (text_length + padding), 3376 cmd->data_crc); 3377 } 3378 3379 cmd->iov_misc_count = iov_count; 3380 cmd->tx_size = tx_size; 3381 3382 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3383 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3384 text_length, conn->cid); 3385 return 0; 3386 } 3387 3388 static int iscsit_send_reject( 3389 struct iscsi_cmd *cmd, 3390 struct iscsi_conn *conn) 3391 { 3392 u32 iov_count = 0, tx_size = 0; 3393 struct iscsi_reject *hdr; 3394 struct kvec *iov; 3395 3396 hdr = (struct iscsi_reject *) cmd->pdu; 3397 hdr->opcode = ISCSI_OP_REJECT; 3398 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3399 hton24(hdr->dlength, ISCSI_HDR_LEN); 3400 hdr->ffffffff = cpu_to_be32(0xffffffff); 3401 cmd->stat_sn = conn->stat_sn++; 3402 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3403 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3404 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3405 3406 iov = &cmd->iov_misc[0]; 3407 3408 iov[iov_count].iov_base = cmd->pdu; 3409 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3410 iov[iov_count].iov_base = cmd->buf_ptr; 3411 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3412 3413 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3414 3415 if (conn->conn_ops->HeaderDigest) { 3416 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3417 3418 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3419 (unsigned char *)hdr, ISCSI_HDR_LEN, 3420 0, NULL, (u8 *)header_digest); 3421 3422 iov[0].iov_len += ISCSI_CRC_LEN; 3423 tx_size += ISCSI_CRC_LEN; 3424 pr_debug("Attaching CRC32 HeaderDigest for" 3425 " REJECT PDU 0x%08x\n", *header_digest); 3426 } 3427 3428 if (conn->conn_ops->DataDigest) { 3429 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3430 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN, 3431 0, NULL, (u8 *)&cmd->data_crc); 3432 3433 iov[iov_count].iov_base = &cmd->data_crc; 3434 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3435 tx_size += ISCSI_CRC_LEN; 3436 pr_debug("Attaching CRC32 DataDigest for REJECT" 3437 " PDU 0x%08x\n", cmd->data_crc); 3438 } 3439 3440 cmd->iov_misc_count = iov_count; 3441 cmd->tx_size = tx_size; 3442 3443 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3444 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3445 3446 return 0; 3447 } 3448 3449 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3450 { 3451 struct iscsi_thread_set *ts = conn->thread_set; 3452 int ord, cpu; 3453 /* 3454 * thread_id is assigned from iscsit_global->ts_bitmap from 3455 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3456 * 3457 * Here we use thread_id to determine which CPU that this 3458 * iSCSI connection's iscsi_thread_set will be scheduled to 3459 * execute upon. 3460 */ 3461 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3462 for_each_online_cpu(cpu) { 3463 if (ord-- == 0) { 3464 cpumask_set_cpu(cpu, conn->conn_cpumask); 3465 return; 3466 } 3467 } 3468 /* 3469 * This should never be reached.. 3470 */ 3471 dump_stack(); 3472 cpumask_setall(conn->conn_cpumask); 3473 } 3474 3475 static inline void iscsit_thread_check_cpumask( 3476 struct iscsi_conn *conn, 3477 struct task_struct *p, 3478 int mode) 3479 { 3480 char buf[128]; 3481 /* 3482 * mode == 1 signals iscsi_target_tx_thread() usage. 3483 * mode == 0 signals iscsi_target_rx_thread() usage. 3484 */ 3485 if (mode == 1) { 3486 if (!conn->conn_tx_reset_cpumask) 3487 return; 3488 conn->conn_tx_reset_cpumask = 0; 3489 } else { 3490 if (!conn->conn_rx_reset_cpumask) 3491 return; 3492 conn->conn_rx_reset_cpumask = 0; 3493 } 3494 /* 3495 * Update the CPU mask for this single kthread so that 3496 * both TX and RX kthreads are scheduled to run on the 3497 * same CPU. 3498 */ 3499 memset(buf, 0, 128); 3500 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3501 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3502 } 3503 3504 static int handle_immediate_queue(struct iscsi_conn *conn) 3505 { 3506 struct iscsi_queue_req *qr; 3507 struct iscsi_cmd *cmd; 3508 u8 state; 3509 int ret; 3510 3511 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3512 atomic_set(&conn->check_immediate_queue, 0); 3513 cmd = qr->cmd; 3514 state = qr->state; 3515 kmem_cache_free(lio_qr_cache, qr); 3516 3517 switch (state) { 3518 case ISTATE_SEND_R2T: 3519 ret = iscsit_send_r2t(cmd, conn); 3520 if (ret < 0) 3521 goto err; 3522 break; 3523 case ISTATE_REMOVE: 3524 if (cmd->data_direction == DMA_TO_DEVICE) 3525 iscsit_stop_dataout_timer(cmd); 3526 3527 spin_lock_bh(&conn->cmd_lock); 3528 list_del(&cmd->i_conn_node); 3529 spin_unlock_bh(&conn->cmd_lock); 3530 3531 iscsit_free_cmd(cmd); 3532 continue; 3533 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3534 iscsit_mod_nopin_response_timer(conn); 3535 ret = iscsit_send_unsolicited_nopin(cmd, 3536 conn, 1); 3537 if (ret < 0) 3538 goto err; 3539 break; 3540 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3541 ret = iscsit_send_unsolicited_nopin(cmd, 3542 conn, 0); 3543 if (ret < 0) 3544 goto err; 3545 break; 3546 default: 3547 pr_err("Unknown Opcode: 0x%02x ITT:" 3548 " 0x%08x, i_state: %d on CID: %hu\n", 3549 cmd->iscsi_opcode, cmd->init_task_tag, state, 3550 conn->cid); 3551 goto err; 3552 } 3553 } 3554 3555 return 0; 3556 3557 err: 3558 return -1; 3559 } 3560 3561 static int handle_response_queue(struct iscsi_conn *conn) 3562 { 3563 struct iscsi_queue_req *qr; 3564 struct iscsi_cmd *cmd; 3565 u8 state; 3566 int ret; 3567 3568 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3569 cmd = qr->cmd; 3570 state = qr->state; 3571 kmem_cache_free(lio_qr_cache, qr); 3572 3573 check_rsp_state: 3574 switch (state) { 3575 case ISTATE_SEND_DATAIN: 3576 ret = iscsit_send_data_in(cmd, conn); 3577 if (ret < 0) 3578 goto err; 3579 else if (!ret) 3580 /* more drs */ 3581 goto check_rsp_state; 3582 else if (ret == 1) { 3583 /* all done */ 3584 spin_lock_bh(&cmd->istate_lock); 3585 cmd->i_state = ISTATE_SENT_STATUS; 3586 spin_unlock_bh(&cmd->istate_lock); 3587 3588 if (atomic_read(&conn->check_immediate_queue)) 3589 return 1; 3590 3591 continue; 3592 } else if (ret == 2) { 3593 /* Still must send status, 3594 SCF_TRANSPORT_TASK_SENSE was set */ 3595 spin_lock_bh(&cmd->istate_lock); 3596 cmd->i_state = ISTATE_SEND_STATUS; 3597 spin_unlock_bh(&cmd->istate_lock); 3598 state = ISTATE_SEND_STATUS; 3599 goto check_rsp_state; 3600 } 3601 3602 break; 3603 case ISTATE_SEND_STATUS: 3604 case ISTATE_SEND_STATUS_RECOVERY: 3605 ret = iscsit_send_status(cmd, conn); 3606 break; 3607 case ISTATE_SEND_LOGOUTRSP: 3608 ret = iscsit_send_logout_response(cmd, conn); 3609 break; 3610 case ISTATE_SEND_ASYNCMSG: 3611 ret = iscsit_send_conn_drop_async_message( 3612 cmd, conn); 3613 break; 3614 case ISTATE_SEND_NOPIN: 3615 ret = iscsit_send_nopin_response(cmd, conn); 3616 break; 3617 case ISTATE_SEND_REJECT: 3618 ret = iscsit_send_reject(cmd, conn); 3619 break; 3620 case ISTATE_SEND_TASKMGTRSP: 3621 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3622 if (ret != 0) 3623 break; 3624 ret = iscsit_tmr_post_handler(cmd, conn); 3625 if (ret != 0) 3626 iscsit_fall_back_to_erl0(conn->sess); 3627 break; 3628 case ISTATE_SEND_TEXTRSP: 3629 ret = iscsit_send_text_rsp(cmd, conn); 3630 break; 3631 default: 3632 pr_err("Unknown Opcode: 0x%02x ITT:" 3633 " 0x%08x, i_state: %d on CID: %hu\n", 3634 cmd->iscsi_opcode, cmd->init_task_tag, 3635 state, conn->cid); 3636 goto err; 3637 } 3638 if (ret < 0) 3639 goto err; 3640 3641 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3642 iscsit_tx_thread_wait_for_tcp(conn); 3643 iscsit_unmap_iovec(cmd); 3644 goto err; 3645 } 3646 iscsit_unmap_iovec(cmd); 3647 3648 switch (state) { 3649 case ISTATE_SEND_LOGOUTRSP: 3650 if (!iscsit_logout_post_handler(cmd, conn)) 3651 goto restart; 3652 /* fall through */ 3653 case ISTATE_SEND_STATUS: 3654 case ISTATE_SEND_ASYNCMSG: 3655 case ISTATE_SEND_NOPIN: 3656 case ISTATE_SEND_STATUS_RECOVERY: 3657 case ISTATE_SEND_TEXTRSP: 3658 case ISTATE_SEND_TASKMGTRSP: 3659 spin_lock_bh(&cmd->istate_lock); 3660 cmd->i_state = ISTATE_SENT_STATUS; 3661 spin_unlock_bh(&cmd->istate_lock); 3662 break; 3663 case ISTATE_SEND_REJECT: 3664 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) { 3665 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN; 3666 complete(&cmd->reject_comp); 3667 goto err; 3668 } 3669 complete(&cmd->reject_comp); 3670 break; 3671 default: 3672 pr_err("Unknown Opcode: 0x%02x ITT:" 3673 " 0x%08x, i_state: %d on CID: %hu\n", 3674 cmd->iscsi_opcode, cmd->init_task_tag, 3675 cmd->i_state, conn->cid); 3676 goto err; 3677 } 3678 3679 if (atomic_read(&conn->check_immediate_queue)) 3680 return 1; 3681 } 3682 3683 return 0; 3684 3685 err: 3686 return -1; 3687 restart: 3688 return -EAGAIN; 3689 } 3690 3691 int iscsi_target_tx_thread(void *arg) 3692 { 3693 int ret = 0; 3694 struct iscsi_conn *conn; 3695 struct iscsi_thread_set *ts = arg; 3696 /* 3697 * Allow ourselves to be interrupted by SIGINT so that a 3698 * connection recovery / failure event can be triggered externally. 3699 */ 3700 allow_signal(SIGINT); 3701 3702 restart: 3703 conn = iscsi_tx_thread_pre_handler(ts); 3704 if (!conn) 3705 goto out; 3706 3707 ret = 0; 3708 3709 while (!kthread_should_stop()) { 3710 /* 3711 * Ensure that both TX and RX per connection kthreads 3712 * are scheduled to run on the same CPU. 3713 */ 3714 iscsit_thread_check_cpumask(conn, current, 1); 3715 3716 wait_event_interruptible(conn->queues_wq, 3717 !iscsit_conn_all_queues_empty(conn) || 3718 ts->status == ISCSI_THREAD_SET_RESET); 3719 3720 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3721 signal_pending(current)) 3722 goto transport_err; 3723 3724 get_immediate: 3725 ret = handle_immediate_queue(conn); 3726 if (ret < 0) 3727 goto transport_err; 3728 3729 ret = handle_response_queue(conn); 3730 if (ret == 1) 3731 goto get_immediate; 3732 else if (ret == -EAGAIN) 3733 goto restart; 3734 else if (ret < 0) 3735 goto transport_err; 3736 } 3737 3738 transport_err: 3739 iscsit_take_action_for_connection_exit(conn); 3740 goto restart; 3741 out: 3742 return 0; 3743 } 3744 3745 int iscsi_target_rx_thread(void *arg) 3746 { 3747 int ret; 3748 u8 buffer[ISCSI_HDR_LEN], opcode; 3749 u32 checksum = 0, digest = 0; 3750 struct iscsi_conn *conn = NULL; 3751 struct iscsi_thread_set *ts = arg; 3752 struct kvec iov; 3753 /* 3754 * Allow ourselves to be interrupted by SIGINT so that a 3755 * connection recovery / failure event can be triggered externally. 3756 */ 3757 allow_signal(SIGINT); 3758 3759 restart: 3760 conn = iscsi_rx_thread_pre_handler(ts); 3761 if (!conn) 3762 goto out; 3763 3764 while (!kthread_should_stop()) { 3765 /* 3766 * Ensure that both TX and RX per connection kthreads 3767 * are scheduled to run on the same CPU. 3768 */ 3769 iscsit_thread_check_cpumask(conn, current, 0); 3770 3771 memset(buffer, 0, ISCSI_HDR_LEN); 3772 memset(&iov, 0, sizeof(struct kvec)); 3773 3774 iov.iov_base = buffer; 3775 iov.iov_len = ISCSI_HDR_LEN; 3776 3777 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3778 if (ret != ISCSI_HDR_LEN) { 3779 iscsit_rx_thread_wait_for_tcp(conn); 3780 goto transport_err; 3781 } 3782 3783 /* 3784 * Set conn->bad_hdr for use with REJECT PDUs. 3785 */ 3786 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN); 3787 3788 if (conn->conn_ops->HeaderDigest) { 3789 iov.iov_base = &digest; 3790 iov.iov_len = ISCSI_CRC_LEN; 3791 3792 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3793 if (ret != ISCSI_CRC_LEN) { 3794 iscsit_rx_thread_wait_for_tcp(conn); 3795 goto transport_err; 3796 } 3797 3798 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 3799 buffer, ISCSI_HDR_LEN, 3800 0, NULL, (u8 *)&checksum); 3801 3802 if (digest != checksum) { 3803 pr_err("HeaderDigest CRC32C failed," 3804 " received 0x%08x, computed 0x%08x\n", 3805 digest, checksum); 3806 /* 3807 * Set the PDU to 0xff so it will intentionally 3808 * hit default in the switch below. 3809 */ 3810 memset(buffer, 0xff, ISCSI_HDR_LEN); 3811 spin_lock_bh(&conn->sess->session_stats_lock); 3812 conn->sess->conn_digest_errors++; 3813 spin_unlock_bh(&conn->sess->session_stats_lock); 3814 } else { 3815 pr_debug("Got HeaderDigest CRC32C" 3816 " 0x%08x\n", checksum); 3817 } 3818 } 3819 3820 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3821 goto transport_err; 3822 3823 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3824 3825 if (conn->sess->sess_ops->SessionType && 3826 ((!(opcode & ISCSI_OP_TEXT)) || 3827 (!(opcode & ISCSI_OP_LOGOUT)))) { 3828 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3829 " while in Discovery Session, rejecting.\n", opcode); 3830 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 3831 buffer, conn); 3832 goto transport_err; 3833 } 3834 3835 switch (opcode) { 3836 case ISCSI_OP_SCSI_CMD: 3837 if (iscsit_handle_scsi_cmd(conn, buffer) < 0) 3838 goto transport_err; 3839 break; 3840 case ISCSI_OP_SCSI_DATA_OUT: 3841 if (iscsit_handle_data_out(conn, buffer) < 0) 3842 goto transport_err; 3843 break; 3844 case ISCSI_OP_NOOP_OUT: 3845 if (iscsit_handle_nop_out(conn, buffer) < 0) 3846 goto transport_err; 3847 break; 3848 case ISCSI_OP_SCSI_TMFUNC: 3849 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0) 3850 goto transport_err; 3851 break; 3852 case ISCSI_OP_TEXT: 3853 if (iscsit_handle_text_cmd(conn, buffer) < 0) 3854 goto transport_err; 3855 break; 3856 case ISCSI_OP_LOGOUT: 3857 ret = iscsit_handle_logout_cmd(conn, buffer); 3858 if (ret > 0) { 3859 wait_for_completion_timeout(&conn->conn_logout_comp, 3860 SECONDS_FOR_LOGOUT_COMP * HZ); 3861 goto transport_err; 3862 } else if (ret < 0) 3863 goto transport_err; 3864 break; 3865 case ISCSI_OP_SNACK: 3866 if (iscsit_handle_snack(conn, buffer) < 0) 3867 goto transport_err; 3868 break; 3869 default: 3870 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", 3871 opcode); 3872 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3873 pr_err("Cannot recover from unknown" 3874 " opcode while ERL=0, closing iSCSI connection" 3875 ".\n"); 3876 goto transport_err; 3877 } 3878 if (!conn->conn_ops->OFMarker) { 3879 pr_err("Unable to recover from unknown" 3880 " opcode while OFMarker=No, closing iSCSI" 3881 " connection.\n"); 3882 goto transport_err; 3883 } 3884 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 3885 pr_err("Unable to recover from unknown" 3886 " opcode, closing iSCSI connection.\n"); 3887 goto transport_err; 3888 } 3889 break; 3890 } 3891 } 3892 3893 transport_err: 3894 if (!signal_pending(current)) 3895 atomic_set(&conn->transport_failed, 1); 3896 iscsit_take_action_for_connection_exit(conn); 3897 goto restart; 3898 out: 3899 return 0; 3900 } 3901 3902 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 3903 { 3904 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 3905 struct iscsi_session *sess = conn->sess; 3906 /* 3907 * We expect this function to only ever be called from either RX or TX 3908 * thread context via iscsit_close_connection() once the other context 3909 * has been reset -> returned sleeping pre-handler state. 3910 */ 3911 spin_lock_bh(&conn->cmd_lock); 3912 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 3913 3914 list_del(&cmd->i_conn_node); 3915 spin_unlock_bh(&conn->cmd_lock); 3916 3917 iscsit_increment_maxcmdsn(cmd, sess); 3918 3919 iscsit_free_cmd(cmd); 3920 3921 spin_lock_bh(&conn->cmd_lock); 3922 } 3923 spin_unlock_bh(&conn->cmd_lock); 3924 } 3925 3926 static void iscsit_stop_timers_for_cmds( 3927 struct iscsi_conn *conn) 3928 { 3929 struct iscsi_cmd *cmd; 3930 3931 spin_lock_bh(&conn->cmd_lock); 3932 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 3933 if (cmd->data_direction == DMA_TO_DEVICE) 3934 iscsit_stop_dataout_timer(cmd); 3935 } 3936 spin_unlock_bh(&conn->cmd_lock); 3937 } 3938 3939 int iscsit_close_connection( 3940 struct iscsi_conn *conn) 3941 { 3942 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 3943 struct iscsi_session *sess = conn->sess; 3944 3945 pr_debug("Closing iSCSI connection CID %hu on SID:" 3946 " %u\n", conn->cid, sess->sid); 3947 /* 3948 * Always up conn_logout_comp just in case the RX Thread is sleeping 3949 * and the logout response never got sent because the connection 3950 * failed. 3951 */ 3952 complete(&conn->conn_logout_comp); 3953 3954 iscsi_release_thread_set(conn); 3955 3956 iscsit_stop_timers_for_cmds(conn); 3957 iscsit_stop_nopin_response_timer(conn); 3958 iscsit_stop_nopin_timer(conn); 3959 iscsit_free_queue_reqs_for_conn(conn); 3960 3961 /* 3962 * During Connection recovery drop unacknowledged out of order 3963 * commands for this connection, and prepare the other commands 3964 * for realligence. 3965 * 3966 * During normal operation clear the out of order commands (but 3967 * do not free the struct iscsi_ooo_cmdsn's) and release all 3968 * struct iscsi_cmds. 3969 */ 3970 if (atomic_read(&conn->connection_recovery)) { 3971 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 3972 iscsit_prepare_cmds_for_realligance(conn); 3973 } else { 3974 iscsit_clear_ooo_cmdsns_for_conn(conn); 3975 iscsit_release_commands_from_conn(conn); 3976 } 3977 3978 /* 3979 * Handle decrementing session or connection usage count if 3980 * a logout response was not able to be sent because the 3981 * connection failed. Fall back to Session Recovery here. 3982 */ 3983 if (atomic_read(&conn->conn_logout_remove)) { 3984 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 3985 iscsit_dec_conn_usage_count(conn); 3986 iscsit_dec_session_usage_count(sess); 3987 } 3988 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 3989 iscsit_dec_conn_usage_count(conn); 3990 3991 atomic_set(&conn->conn_logout_remove, 0); 3992 atomic_set(&sess->session_reinstatement, 0); 3993 atomic_set(&sess->session_fall_back_to_erl0, 1); 3994 } 3995 3996 spin_lock_bh(&sess->conn_lock); 3997 list_del(&conn->conn_list); 3998 3999 /* 4000 * Attempt to let the Initiator know this connection failed by 4001 * sending an Connection Dropped Async Message on another 4002 * active connection. 4003 */ 4004 if (atomic_read(&conn->connection_recovery)) 4005 iscsit_build_conn_drop_async_message(conn); 4006 4007 spin_unlock_bh(&sess->conn_lock); 4008 4009 /* 4010 * If connection reinstatement is being performed on this connection, 4011 * up the connection reinstatement semaphore that is being blocked on 4012 * in iscsit_cause_connection_reinstatement(). 4013 */ 4014 spin_lock_bh(&conn->state_lock); 4015 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4016 spin_unlock_bh(&conn->state_lock); 4017 complete(&conn->conn_wait_comp); 4018 wait_for_completion(&conn->conn_post_wait_comp); 4019 spin_lock_bh(&conn->state_lock); 4020 } 4021 4022 /* 4023 * If connection reinstatement is being performed on this connection 4024 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4025 * connection wait rcfr semaphore that is being blocked on 4026 * an iscsit_connection_reinstatement_rcfr(). 4027 */ 4028 if (atomic_read(&conn->connection_wait_rcfr)) { 4029 spin_unlock_bh(&conn->state_lock); 4030 complete(&conn->conn_wait_rcfr_comp); 4031 wait_for_completion(&conn->conn_post_wait_comp); 4032 spin_lock_bh(&conn->state_lock); 4033 } 4034 atomic_set(&conn->connection_reinstatement, 1); 4035 spin_unlock_bh(&conn->state_lock); 4036 4037 /* 4038 * If any other processes are accessing this connection pointer we 4039 * must wait until they have completed. 4040 */ 4041 iscsit_check_conn_usage_count(conn); 4042 4043 if (conn->conn_rx_hash.tfm) 4044 crypto_free_hash(conn->conn_rx_hash.tfm); 4045 if (conn->conn_tx_hash.tfm) 4046 crypto_free_hash(conn->conn_tx_hash.tfm); 4047 4048 if (conn->conn_cpumask) 4049 free_cpumask_var(conn->conn_cpumask); 4050 4051 kfree(conn->conn_ops); 4052 conn->conn_ops = NULL; 4053 4054 if (conn->sock) 4055 sock_release(conn->sock); 4056 conn->thread_set = NULL; 4057 4058 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4059 conn->conn_state = TARG_CONN_STATE_FREE; 4060 kfree(conn); 4061 4062 spin_lock_bh(&sess->conn_lock); 4063 atomic_dec(&sess->nconn); 4064 pr_debug("Decremented iSCSI connection count to %hu from node:" 4065 " %s\n", atomic_read(&sess->nconn), 4066 sess->sess_ops->InitiatorName); 4067 /* 4068 * Make sure that if one connection fails in an non ERL=2 iSCSI 4069 * Session that they all fail. 4070 */ 4071 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4072 !atomic_read(&sess->session_logout)) 4073 atomic_set(&sess->session_fall_back_to_erl0, 1); 4074 4075 /* 4076 * If this was not the last connection in the session, and we are 4077 * performing session reinstatement or falling back to ERL=0, call 4078 * iscsit_stop_session() without sleeping to shutdown the other 4079 * active connections. 4080 */ 4081 if (atomic_read(&sess->nconn)) { 4082 if (!atomic_read(&sess->session_reinstatement) && 4083 !atomic_read(&sess->session_fall_back_to_erl0)) { 4084 spin_unlock_bh(&sess->conn_lock); 4085 return 0; 4086 } 4087 if (!atomic_read(&sess->session_stop_active)) { 4088 atomic_set(&sess->session_stop_active, 1); 4089 spin_unlock_bh(&sess->conn_lock); 4090 iscsit_stop_session(sess, 0, 0); 4091 return 0; 4092 } 4093 spin_unlock_bh(&sess->conn_lock); 4094 return 0; 4095 } 4096 4097 /* 4098 * If this was the last connection in the session and one of the 4099 * following is occurring: 4100 * 4101 * Session Reinstatement is not being performed, and are falling back 4102 * to ERL=0 call iscsit_close_session(). 4103 * 4104 * Session Logout was requested. iscsit_close_session() will be called 4105 * elsewhere. 4106 * 4107 * Session Continuation is not being performed, start the Time2Retain 4108 * handler and check if sleep_on_sess_wait_sem is active. 4109 */ 4110 if (!atomic_read(&sess->session_reinstatement) && 4111 atomic_read(&sess->session_fall_back_to_erl0)) { 4112 spin_unlock_bh(&sess->conn_lock); 4113 target_put_session(sess->se_sess); 4114 4115 return 0; 4116 } else if (atomic_read(&sess->session_logout)) { 4117 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4118 sess->session_state = TARG_SESS_STATE_FREE; 4119 spin_unlock_bh(&sess->conn_lock); 4120 4121 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4122 complete(&sess->session_wait_comp); 4123 4124 return 0; 4125 } else { 4126 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4127 sess->session_state = TARG_SESS_STATE_FAILED; 4128 4129 if (!atomic_read(&sess->session_continuation)) { 4130 spin_unlock_bh(&sess->conn_lock); 4131 iscsit_start_time2retain_handler(sess); 4132 } else 4133 spin_unlock_bh(&sess->conn_lock); 4134 4135 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4136 complete(&sess->session_wait_comp); 4137 4138 return 0; 4139 } 4140 spin_unlock_bh(&sess->conn_lock); 4141 4142 return 0; 4143 } 4144 4145 int iscsit_close_session(struct iscsi_session *sess) 4146 { 4147 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); 4148 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4149 4150 if (atomic_read(&sess->nconn)) { 4151 pr_err("%d connection(s) still exist for iSCSI session" 4152 " to %s\n", atomic_read(&sess->nconn), 4153 sess->sess_ops->InitiatorName); 4154 BUG(); 4155 } 4156 4157 spin_lock_bh(&se_tpg->session_lock); 4158 atomic_set(&sess->session_logout, 1); 4159 atomic_set(&sess->session_reinstatement, 1); 4160 iscsit_stop_time2retain_timer(sess); 4161 spin_unlock_bh(&se_tpg->session_lock); 4162 4163 /* 4164 * transport_deregister_session_configfs() will clear the 4165 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4166 * can be setting it again with __transport_register_session() in 4167 * iscsi_post_login_handler() again after the iscsit_stop_session() 4168 * completes in iscsi_np context. 4169 */ 4170 transport_deregister_session_configfs(sess->se_sess); 4171 4172 /* 4173 * If any other processes are accessing this session pointer we must 4174 * wait until they have completed. If we are in an interrupt (the 4175 * time2retain handler) and contain and active session usage count we 4176 * restart the timer and exit. 4177 */ 4178 if (!in_interrupt()) { 4179 if (iscsit_check_session_usage_count(sess) == 1) 4180 iscsit_stop_session(sess, 1, 1); 4181 } else { 4182 if (iscsit_check_session_usage_count(sess) == 2) { 4183 atomic_set(&sess->session_logout, 0); 4184 iscsit_start_time2retain_handler(sess); 4185 return 0; 4186 } 4187 } 4188 4189 transport_deregister_session(sess->se_sess); 4190 4191 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4192 iscsit_free_connection_recovery_entires(sess); 4193 4194 iscsit_free_all_ooo_cmdsns(sess); 4195 4196 spin_lock_bh(&se_tpg->session_lock); 4197 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4198 sess->session_state = TARG_SESS_STATE_FREE; 4199 pr_debug("Released iSCSI session from node: %s\n", 4200 sess->sess_ops->InitiatorName); 4201 tpg->nsessions--; 4202 if (tpg->tpg_tiqn) 4203 tpg->tpg_tiqn->tiqn_nsessions--; 4204 4205 pr_debug("Decremented number of active iSCSI Sessions on" 4206 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4207 4208 spin_lock(&sess_idr_lock); 4209 idr_remove(&sess_idr, sess->session_index); 4210 spin_unlock(&sess_idr_lock); 4211 4212 kfree(sess->sess_ops); 4213 sess->sess_ops = NULL; 4214 spin_unlock_bh(&se_tpg->session_lock); 4215 4216 kfree(sess); 4217 return 0; 4218 } 4219 4220 static void iscsit_logout_post_handler_closesession( 4221 struct iscsi_conn *conn) 4222 { 4223 struct iscsi_session *sess = conn->sess; 4224 4225 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4226 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4227 4228 atomic_set(&conn->conn_logout_remove, 0); 4229 complete(&conn->conn_logout_comp); 4230 4231 iscsit_dec_conn_usage_count(conn); 4232 iscsit_stop_session(sess, 1, 1); 4233 iscsit_dec_session_usage_count(sess); 4234 target_put_session(sess->se_sess); 4235 } 4236 4237 static void iscsit_logout_post_handler_samecid( 4238 struct iscsi_conn *conn) 4239 { 4240 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4241 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4242 4243 atomic_set(&conn->conn_logout_remove, 0); 4244 complete(&conn->conn_logout_comp); 4245 4246 iscsit_cause_connection_reinstatement(conn, 1); 4247 iscsit_dec_conn_usage_count(conn); 4248 } 4249 4250 static void iscsit_logout_post_handler_diffcid( 4251 struct iscsi_conn *conn, 4252 u16 cid) 4253 { 4254 struct iscsi_conn *l_conn; 4255 struct iscsi_session *sess = conn->sess; 4256 4257 if (!sess) 4258 return; 4259 4260 spin_lock_bh(&sess->conn_lock); 4261 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4262 if (l_conn->cid == cid) { 4263 iscsit_inc_conn_usage_count(l_conn); 4264 break; 4265 } 4266 } 4267 spin_unlock_bh(&sess->conn_lock); 4268 4269 if (!l_conn) 4270 return; 4271 4272 if (l_conn->sock) 4273 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4274 4275 spin_lock_bh(&l_conn->state_lock); 4276 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4277 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4278 spin_unlock_bh(&l_conn->state_lock); 4279 4280 iscsit_cause_connection_reinstatement(l_conn, 1); 4281 iscsit_dec_conn_usage_count(l_conn); 4282 } 4283 4284 /* 4285 * Return of 0 causes the TX thread to restart. 4286 */ 4287 static int iscsit_logout_post_handler( 4288 struct iscsi_cmd *cmd, 4289 struct iscsi_conn *conn) 4290 { 4291 int ret = 0; 4292 4293 switch (cmd->logout_reason) { 4294 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4295 switch (cmd->logout_response) { 4296 case ISCSI_LOGOUT_SUCCESS: 4297 case ISCSI_LOGOUT_CLEANUP_FAILED: 4298 default: 4299 iscsit_logout_post_handler_closesession(conn); 4300 break; 4301 } 4302 ret = 0; 4303 break; 4304 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4305 if (conn->cid == cmd->logout_cid) { 4306 switch (cmd->logout_response) { 4307 case ISCSI_LOGOUT_SUCCESS: 4308 case ISCSI_LOGOUT_CLEANUP_FAILED: 4309 default: 4310 iscsit_logout_post_handler_samecid(conn); 4311 break; 4312 } 4313 ret = 0; 4314 } else { 4315 switch (cmd->logout_response) { 4316 case ISCSI_LOGOUT_SUCCESS: 4317 iscsit_logout_post_handler_diffcid(conn, 4318 cmd->logout_cid); 4319 break; 4320 case ISCSI_LOGOUT_CID_NOT_FOUND: 4321 case ISCSI_LOGOUT_CLEANUP_FAILED: 4322 default: 4323 break; 4324 } 4325 ret = 1; 4326 } 4327 break; 4328 case ISCSI_LOGOUT_REASON_RECOVERY: 4329 switch (cmd->logout_response) { 4330 case ISCSI_LOGOUT_SUCCESS: 4331 case ISCSI_LOGOUT_CID_NOT_FOUND: 4332 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4333 case ISCSI_LOGOUT_CLEANUP_FAILED: 4334 default: 4335 break; 4336 } 4337 ret = 1; 4338 break; 4339 default: 4340 break; 4341 4342 } 4343 return ret; 4344 } 4345 4346 void iscsit_fail_session(struct iscsi_session *sess) 4347 { 4348 struct iscsi_conn *conn; 4349 4350 spin_lock_bh(&sess->conn_lock); 4351 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4352 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4353 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4354 } 4355 spin_unlock_bh(&sess->conn_lock); 4356 4357 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4358 sess->session_state = TARG_SESS_STATE_FAILED; 4359 } 4360 4361 int iscsit_free_session(struct iscsi_session *sess) 4362 { 4363 u16 conn_count = atomic_read(&sess->nconn); 4364 struct iscsi_conn *conn, *conn_tmp = NULL; 4365 int is_last; 4366 4367 spin_lock_bh(&sess->conn_lock); 4368 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4369 4370 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4371 conn_list) { 4372 if (conn_count == 0) 4373 break; 4374 4375 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4376 is_last = 1; 4377 } else { 4378 iscsit_inc_conn_usage_count(conn_tmp); 4379 is_last = 0; 4380 } 4381 iscsit_inc_conn_usage_count(conn); 4382 4383 spin_unlock_bh(&sess->conn_lock); 4384 iscsit_cause_connection_reinstatement(conn, 1); 4385 spin_lock_bh(&sess->conn_lock); 4386 4387 iscsit_dec_conn_usage_count(conn); 4388 if (is_last == 0) 4389 iscsit_dec_conn_usage_count(conn_tmp); 4390 4391 conn_count--; 4392 } 4393 4394 if (atomic_read(&sess->nconn)) { 4395 spin_unlock_bh(&sess->conn_lock); 4396 wait_for_completion(&sess->session_wait_comp); 4397 } else 4398 spin_unlock_bh(&sess->conn_lock); 4399 4400 target_put_session(sess->se_sess); 4401 return 0; 4402 } 4403 4404 void iscsit_stop_session( 4405 struct iscsi_session *sess, 4406 int session_sleep, 4407 int connection_sleep) 4408 { 4409 u16 conn_count = atomic_read(&sess->nconn); 4410 struct iscsi_conn *conn, *conn_tmp = NULL; 4411 int is_last; 4412 4413 spin_lock_bh(&sess->conn_lock); 4414 if (session_sleep) 4415 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4416 4417 if (connection_sleep) { 4418 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4419 conn_list) { 4420 if (conn_count == 0) 4421 break; 4422 4423 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4424 is_last = 1; 4425 } else { 4426 iscsit_inc_conn_usage_count(conn_tmp); 4427 is_last = 0; 4428 } 4429 iscsit_inc_conn_usage_count(conn); 4430 4431 spin_unlock_bh(&sess->conn_lock); 4432 iscsit_cause_connection_reinstatement(conn, 1); 4433 spin_lock_bh(&sess->conn_lock); 4434 4435 iscsit_dec_conn_usage_count(conn); 4436 if (is_last == 0) 4437 iscsit_dec_conn_usage_count(conn_tmp); 4438 conn_count--; 4439 } 4440 } else { 4441 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4442 iscsit_cause_connection_reinstatement(conn, 0); 4443 } 4444 4445 if (session_sleep && atomic_read(&sess->nconn)) { 4446 spin_unlock_bh(&sess->conn_lock); 4447 wait_for_completion(&sess->session_wait_comp); 4448 } else 4449 spin_unlock_bh(&sess->conn_lock); 4450 } 4451 4452 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4453 { 4454 struct iscsi_session *sess; 4455 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4456 struct se_session *se_sess, *se_sess_tmp; 4457 int session_count = 0; 4458 4459 spin_lock_bh(&se_tpg->session_lock); 4460 if (tpg->nsessions && !force) { 4461 spin_unlock_bh(&se_tpg->session_lock); 4462 return -1; 4463 } 4464 4465 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4466 sess_list) { 4467 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4468 4469 spin_lock(&sess->conn_lock); 4470 if (atomic_read(&sess->session_fall_back_to_erl0) || 4471 atomic_read(&sess->session_logout) || 4472 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4473 spin_unlock(&sess->conn_lock); 4474 continue; 4475 } 4476 atomic_set(&sess->session_reinstatement, 1); 4477 spin_unlock(&sess->conn_lock); 4478 spin_unlock_bh(&se_tpg->session_lock); 4479 4480 iscsit_free_session(sess); 4481 spin_lock_bh(&se_tpg->session_lock); 4482 4483 session_count++; 4484 } 4485 spin_unlock_bh(&se_tpg->session_lock); 4486 4487 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4488 " Group: %hu\n", session_count, tpg->tpgt); 4489 return 0; 4490 } 4491 4492 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4493 MODULE_VERSION("4.1.x"); 4494 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4495 MODULE_LICENSE("GPL"); 4496 4497 module_init(iscsi_target_init_module); 4498 module_exit(iscsi_target_cleanup_module); 4499