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 #include <target/iscsi/iscsi_transport.h> 53 54 static LIST_HEAD(g_tiqn_list); 55 static LIST_HEAD(g_np_list); 56 static DEFINE_SPINLOCK(tiqn_lock); 57 static DEFINE_SPINLOCK(np_lock); 58 59 static struct idr tiqn_idr; 60 struct idr sess_idr; 61 struct mutex auth_id_lock; 62 spinlock_t sess_idr_lock; 63 64 struct iscsit_global *iscsit_global; 65 66 struct kmem_cache *lio_cmd_cache; 67 struct kmem_cache *lio_qr_cache; 68 struct kmem_cache *lio_dr_cache; 69 struct kmem_cache *lio_ooo_cache; 70 struct kmem_cache *lio_r2t_cache; 71 72 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 73 struct iscsi_scsi_req *, u32); 74 75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 76 { 77 struct iscsi_tiqn *tiqn = NULL; 78 79 spin_lock(&tiqn_lock); 80 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 81 if (!strcmp(tiqn->tiqn, buf)) { 82 83 spin_lock(&tiqn->tiqn_state_lock); 84 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 85 tiqn->tiqn_access_count++; 86 spin_unlock(&tiqn->tiqn_state_lock); 87 spin_unlock(&tiqn_lock); 88 return tiqn; 89 } 90 spin_unlock(&tiqn->tiqn_state_lock); 91 } 92 } 93 spin_unlock(&tiqn_lock); 94 95 return NULL; 96 } 97 98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 99 { 100 spin_lock(&tiqn->tiqn_state_lock); 101 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 102 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 103 spin_unlock(&tiqn->tiqn_state_lock); 104 return 0; 105 } 106 spin_unlock(&tiqn->tiqn_state_lock); 107 108 return -1; 109 } 110 111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 112 { 113 spin_lock(&tiqn->tiqn_state_lock); 114 tiqn->tiqn_access_count--; 115 spin_unlock(&tiqn->tiqn_state_lock); 116 } 117 118 /* 119 * Note that IQN formatting is expected to be done in userspace, and 120 * no explict IQN format checks are done here. 121 */ 122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 123 { 124 struct iscsi_tiqn *tiqn = NULL; 125 int ret; 126 127 if (strlen(buf) >= ISCSI_IQN_LEN) { 128 pr_err("Target IQN exceeds %d bytes\n", 129 ISCSI_IQN_LEN); 130 return ERR_PTR(-EINVAL); 131 } 132 133 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 134 if (!tiqn) { 135 pr_err("Unable to allocate struct iscsi_tiqn\n"); 136 return ERR_PTR(-ENOMEM); 137 } 138 139 sprintf(tiqn->tiqn, "%s", buf); 140 INIT_LIST_HEAD(&tiqn->tiqn_list); 141 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 142 spin_lock_init(&tiqn->tiqn_state_lock); 143 spin_lock_init(&tiqn->tiqn_tpg_lock); 144 spin_lock_init(&tiqn->sess_err_stats.lock); 145 spin_lock_init(&tiqn->login_stats.lock); 146 spin_lock_init(&tiqn->logout_stats.lock); 147 148 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 149 150 idr_preload(GFP_KERNEL); 151 spin_lock(&tiqn_lock); 152 153 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 154 if (ret < 0) { 155 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 156 spin_unlock(&tiqn_lock); 157 idr_preload_end(); 158 kfree(tiqn); 159 return ERR_PTR(ret); 160 } 161 tiqn->tiqn_index = ret; 162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 163 164 spin_unlock(&tiqn_lock); 165 idr_preload_end(); 166 167 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 168 169 return tiqn; 170 171 } 172 173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 174 { 175 /* 176 * Wait for accesses to said struct iscsi_tiqn to end. 177 */ 178 spin_lock(&tiqn->tiqn_state_lock); 179 while (tiqn->tiqn_access_count != 0) { 180 spin_unlock(&tiqn->tiqn_state_lock); 181 msleep(10); 182 spin_lock(&tiqn->tiqn_state_lock); 183 } 184 spin_unlock(&tiqn->tiqn_state_lock); 185 } 186 187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 188 { 189 /* 190 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 191 * while holding tiqn->tiqn_state_lock. This means that all subsequent 192 * attempts to access this struct iscsi_tiqn will fail from both transport 193 * fabric and control code paths. 194 */ 195 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 196 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 197 return; 198 } 199 200 iscsit_wait_for_tiqn(tiqn); 201 202 spin_lock(&tiqn_lock); 203 list_del(&tiqn->tiqn_list); 204 idr_remove(&tiqn_idr, tiqn->tiqn_index); 205 spin_unlock(&tiqn_lock); 206 207 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 208 tiqn->tiqn); 209 kfree(tiqn); 210 } 211 212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 213 { 214 int ret; 215 /* 216 * Determine if the network portal is accepting storage traffic. 217 */ 218 spin_lock_bh(&np->np_thread_lock); 219 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 220 spin_unlock_bh(&np->np_thread_lock); 221 return -1; 222 } 223 if (np->np_login_tpg) { 224 pr_err("np->np_login_tpg() is not NULL!\n"); 225 spin_unlock_bh(&np->np_thread_lock); 226 return -1; 227 } 228 spin_unlock_bh(&np->np_thread_lock); 229 /* 230 * Determine if the portal group is accepting storage traffic. 231 */ 232 spin_lock_bh(&tpg->tpg_state_lock); 233 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 234 spin_unlock_bh(&tpg->tpg_state_lock); 235 return -1; 236 } 237 spin_unlock_bh(&tpg->tpg_state_lock); 238 239 /* 240 * Here we serialize access across the TIQN+TPG Tuple. 241 */ 242 ret = mutex_lock_interruptible(&tpg->np_login_lock); 243 if ((ret != 0) || signal_pending(current)) 244 return -1; 245 246 spin_lock_bh(&np->np_thread_lock); 247 np->np_login_tpg = tpg; 248 spin_unlock_bh(&np->np_thread_lock); 249 250 return 0; 251 } 252 253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 254 { 255 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 256 257 spin_lock_bh(&np->np_thread_lock); 258 np->np_login_tpg = NULL; 259 spin_unlock_bh(&np->np_thread_lock); 260 261 mutex_unlock(&tpg->np_login_lock); 262 263 if (tiqn) 264 iscsit_put_tiqn_for_login(tiqn); 265 266 return 0; 267 } 268 269 bool iscsit_check_np_match( 270 struct __kernel_sockaddr_storage *sockaddr, 271 struct iscsi_np *np, 272 int network_transport) 273 { 274 struct sockaddr_in *sock_in, *sock_in_e; 275 struct sockaddr_in6 *sock_in6, *sock_in6_e; 276 bool ip_match = false; 277 u16 port; 278 279 if (sockaddr->ss_family == AF_INET6) { 280 sock_in6 = (struct sockaddr_in6 *)sockaddr; 281 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 282 283 if (!memcmp(&sock_in6->sin6_addr.in6_u, 284 &sock_in6_e->sin6_addr.in6_u, 285 sizeof(struct in6_addr))) 286 ip_match = true; 287 288 port = ntohs(sock_in6->sin6_port); 289 } else { 290 sock_in = (struct sockaddr_in *)sockaddr; 291 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 292 293 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 294 ip_match = true; 295 296 port = ntohs(sock_in->sin_port); 297 } 298 299 if ((ip_match == true) && (np->np_port == port) && 300 (np->np_network_transport == network_transport)) 301 return true; 302 303 return false; 304 } 305 306 static struct iscsi_np *iscsit_get_np( 307 struct __kernel_sockaddr_storage *sockaddr, 308 int network_transport) 309 { 310 struct iscsi_np *np; 311 bool match; 312 313 spin_lock_bh(&np_lock); 314 list_for_each_entry(np, &g_np_list, np_list) { 315 spin_lock(&np->np_thread_lock); 316 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 317 spin_unlock(&np->np_thread_lock); 318 continue; 319 } 320 321 match = iscsit_check_np_match(sockaddr, np, network_transport); 322 if (match == true) { 323 /* 324 * Increment the np_exports reference count now to 325 * prevent iscsit_del_np() below from being called 326 * while iscsi_tpg_add_network_portal() is called. 327 */ 328 np->np_exports++; 329 spin_unlock(&np->np_thread_lock); 330 spin_unlock_bh(&np_lock); 331 return np; 332 } 333 spin_unlock(&np->np_thread_lock); 334 } 335 spin_unlock_bh(&np_lock); 336 337 return NULL; 338 } 339 340 struct iscsi_np *iscsit_add_np( 341 struct __kernel_sockaddr_storage *sockaddr, 342 char *ip_str, 343 int network_transport) 344 { 345 struct sockaddr_in *sock_in; 346 struct sockaddr_in6 *sock_in6; 347 struct iscsi_np *np; 348 int ret; 349 /* 350 * Locate the existing struct iscsi_np if already active.. 351 */ 352 np = iscsit_get_np(sockaddr, network_transport); 353 if (np) 354 return np; 355 356 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 357 if (!np) { 358 pr_err("Unable to allocate memory for struct iscsi_np\n"); 359 return ERR_PTR(-ENOMEM); 360 } 361 362 np->np_flags |= NPF_IP_NETWORK; 363 if (sockaddr->ss_family == AF_INET6) { 364 sock_in6 = (struct sockaddr_in6 *)sockaddr; 365 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 366 np->np_port = ntohs(sock_in6->sin6_port); 367 } else { 368 sock_in = (struct sockaddr_in *)sockaddr; 369 sprintf(np->np_ip, "%s", ip_str); 370 np->np_port = ntohs(sock_in->sin_port); 371 } 372 373 np->np_network_transport = network_transport; 374 spin_lock_init(&np->np_thread_lock); 375 init_completion(&np->np_restart_comp); 376 INIT_LIST_HEAD(&np->np_list); 377 378 ret = iscsi_target_setup_login_socket(np, sockaddr); 379 if (ret != 0) { 380 kfree(np); 381 return ERR_PTR(ret); 382 } 383 384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 385 if (IS_ERR(np->np_thread)) { 386 pr_err("Unable to create kthread: iscsi_np\n"); 387 ret = PTR_ERR(np->np_thread); 388 kfree(np); 389 return ERR_PTR(ret); 390 } 391 /* 392 * Increment the np_exports reference count now to prevent 393 * iscsit_del_np() below from being run while a new call to 394 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 395 * active. We don't need to hold np->np_thread_lock at this 396 * point because iscsi_np has not been added to g_np_list yet. 397 */ 398 np->np_exports = 1; 399 400 spin_lock_bh(&np_lock); 401 list_add_tail(&np->np_list, &g_np_list); 402 spin_unlock_bh(&np_lock); 403 404 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 405 np->np_ip, np->np_port, np->np_transport->name); 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 void iscsit_free_np(struct iscsi_np *np) 445 { 446 if (np->np_socket) 447 sock_release(np->np_socket); 448 } 449 450 int iscsit_del_np(struct iscsi_np *np) 451 { 452 spin_lock_bh(&np->np_thread_lock); 453 np->np_exports--; 454 if (np->np_exports) { 455 spin_unlock_bh(&np->np_thread_lock); 456 return 0; 457 } 458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 459 spin_unlock_bh(&np->np_thread_lock); 460 461 if (np->np_thread) { 462 /* 463 * We need to send the signal to wakeup Linux/Net 464 * which may be sleeping in sock_accept().. 465 */ 466 send_sig(SIGINT, np->np_thread, 1); 467 kthread_stop(np->np_thread); 468 } 469 470 np->np_transport->iscsit_free_np(np); 471 472 spin_lock_bh(&np_lock); 473 list_del(&np->np_list); 474 spin_unlock_bh(&np_lock); 475 476 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 477 np->np_ip, np->np_port, np->np_transport->name); 478 479 iscsit_put_transport(np->np_transport); 480 kfree(np); 481 return 0; 482 } 483 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int); 486 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 488 { 489 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 490 return 0; 491 } 492 493 static struct iscsit_transport iscsi_target_transport = { 494 .name = "iSCSI/TCP", 495 .transport_type = ISCSI_TCP, 496 .owner = NULL, 497 .iscsit_setup_np = iscsit_setup_np, 498 .iscsit_accept_np = iscsit_accept_np, 499 .iscsit_free_np = iscsit_free_np, 500 .iscsit_alloc_cmd = iscsit_alloc_cmd, 501 .iscsit_get_login_rx = iscsit_get_login_rx, 502 .iscsit_put_login_tx = iscsit_put_login_tx, 503 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 504 .iscsit_immediate_queue = iscsit_immediate_queue, 505 .iscsit_response_queue = iscsit_response_queue, 506 .iscsit_queue_data_in = iscsit_queue_rsp, 507 .iscsit_queue_status = iscsit_queue_rsp, 508 }; 509 510 static int __init iscsi_target_init_module(void) 511 { 512 int ret = 0; 513 514 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 515 516 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 517 if (!iscsit_global) { 518 pr_err("Unable to allocate memory for iscsit_global\n"); 519 return -1; 520 } 521 mutex_init(&auth_id_lock); 522 spin_lock_init(&sess_idr_lock); 523 idr_init(&tiqn_idr); 524 idr_init(&sess_idr); 525 526 ret = iscsi_target_register_configfs(); 527 if (ret < 0) 528 goto out; 529 530 ret = iscsi_thread_set_init(); 531 if (ret < 0) 532 goto configfs_out; 533 534 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 535 TARGET_THREAD_SET_COUNT) { 536 pr_err("iscsi_allocate_thread_sets() returned" 537 " unexpected value!\n"); 538 goto ts_out1; 539 } 540 541 lio_cmd_cache = kmem_cache_create("lio_cmd_cache", 542 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd), 543 0, NULL); 544 if (!lio_cmd_cache) { 545 pr_err("Unable to kmem_cache_create() for" 546 " lio_cmd_cache\n"); 547 goto ts_out2; 548 } 549 550 lio_qr_cache = kmem_cache_create("lio_qr_cache", 551 sizeof(struct iscsi_queue_req), 552 __alignof__(struct iscsi_queue_req), 0, NULL); 553 if (!lio_qr_cache) { 554 pr_err("nable to kmem_cache_create() for" 555 " lio_qr_cache\n"); 556 goto cmd_out; 557 } 558 559 lio_dr_cache = kmem_cache_create("lio_dr_cache", 560 sizeof(struct iscsi_datain_req), 561 __alignof__(struct iscsi_datain_req), 0, NULL); 562 if (!lio_dr_cache) { 563 pr_err("Unable to kmem_cache_create() for" 564 " lio_dr_cache\n"); 565 goto qr_out; 566 } 567 568 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 569 sizeof(struct iscsi_ooo_cmdsn), 570 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 571 if (!lio_ooo_cache) { 572 pr_err("Unable to kmem_cache_create() for" 573 " lio_ooo_cache\n"); 574 goto dr_out; 575 } 576 577 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 578 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 579 0, NULL); 580 if (!lio_r2t_cache) { 581 pr_err("Unable to kmem_cache_create() for" 582 " lio_r2t_cache\n"); 583 goto ooo_out; 584 } 585 586 iscsit_register_transport(&iscsi_target_transport); 587 588 if (iscsit_load_discovery_tpg() < 0) 589 goto r2t_out; 590 591 return ret; 592 r2t_out: 593 kmem_cache_destroy(lio_r2t_cache); 594 ooo_out: 595 kmem_cache_destroy(lio_ooo_cache); 596 dr_out: 597 kmem_cache_destroy(lio_dr_cache); 598 qr_out: 599 kmem_cache_destroy(lio_qr_cache); 600 cmd_out: 601 kmem_cache_destroy(lio_cmd_cache); 602 ts_out2: 603 iscsi_deallocate_thread_sets(); 604 ts_out1: 605 iscsi_thread_set_free(); 606 configfs_out: 607 iscsi_target_deregister_configfs(); 608 out: 609 kfree(iscsit_global); 610 return -ENOMEM; 611 } 612 613 static void __exit iscsi_target_cleanup_module(void) 614 { 615 iscsi_deallocate_thread_sets(); 616 iscsi_thread_set_free(); 617 iscsit_release_discovery_tpg(); 618 iscsit_unregister_transport(&iscsi_target_transport); 619 kmem_cache_destroy(lio_cmd_cache); 620 kmem_cache_destroy(lio_qr_cache); 621 kmem_cache_destroy(lio_dr_cache); 622 kmem_cache_destroy(lio_ooo_cache); 623 kmem_cache_destroy(lio_r2t_cache); 624 625 iscsi_target_deregister_configfs(); 626 627 kfree(iscsit_global); 628 } 629 630 static int iscsit_add_reject( 631 u8 reason, 632 int fail_conn, 633 unsigned char *buf, 634 struct iscsi_conn *conn) 635 { 636 struct iscsi_cmd *cmd; 637 struct iscsi_reject *hdr; 638 int ret; 639 640 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 641 if (!cmd) 642 return -1; 643 644 cmd->iscsi_opcode = ISCSI_OP_REJECT; 645 if (fail_conn) 646 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 647 648 hdr = (struct iscsi_reject *) cmd->pdu; 649 hdr->reason = reason; 650 651 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 652 if (!cmd->buf_ptr) { 653 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 654 iscsit_free_cmd(cmd, false); 655 return -1; 656 } 657 658 spin_lock_bh(&conn->cmd_lock); 659 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 660 spin_unlock_bh(&conn->cmd_lock); 661 662 cmd->i_state = ISTATE_SEND_REJECT; 663 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 664 665 ret = wait_for_completion_interruptible(&cmd->reject_comp); 666 if (ret != 0) 667 return -1; 668 669 return (!fail_conn) ? 0 : -1; 670 } 671 672 int iscsit_add_reject_from_cmd( 673 u8 reason, 674 int fail_conn, 675 int add_to_conn, 676 unsigned char *buf, 677 struct iscsi_cmd *cmd) 678 { 679 struct iscsi_conn *conn; 680 struct iscsi_reject *hdr; 681 int ret; 682 683 if (!cmd->conn) { 684 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 685 cmd->init_task_tag); 686 return -1; 687 } 688 conn = cmd->conn; 689 690 cmd->iscsi_opcode = ISCSI_OP_REJECT; 691 if (fail_conn) 692 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 693 694 hdr = (struct iscsi_reject *) cmd->pdu; 695 hdr->reason = reason; 696 697 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 698 if (!cmd->buf_ptr) { 699 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 700 iscsit_free_cmd(cmd, false); 701 return -1; 702 } 703 704 if (add_to_conn) { 705 spin_lock_bh(&conn->cmd_lock); 706 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 707 spin_unlock_bh(&conn->cmd_lock); 708 } 709 710 cmd->i_state = ISTATE_SEND_REJECT; 711 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 712 713 ret = wait_for_completion_interruptible(&cmd->reject_comp); 714 /* 715 * Perform the kref_put now if se_cmd has already been setup by 716 * scsit_setup_scsi_cmd() 717 */ 718 if (cmd->se_cmd.se_tfo != NULL) { 719 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 720 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 721 } 722 if (ret != 0) 723 return -1; 724 725 return (!fail_conn) ? 0 : -1; 726 } 727 EXPORT_SYMBOL(iscsit_add_reject_from_cmd); 728 729 /* 730 * Map some portion of the allocated scatterlist to an iovec, suitable for 731 * kernel sockets to copy data in/out. 732 */ 733 static int iscsit_map_iovec( 734 struct iscsi_cmd *cmd, 735 struct kvec *iov, 736 u32 data_offset, 737 u32 data_length) 738 { 739 u32 i = 0; 740 struct scatterlist *sg; 741 unsigned int page_off; 742 743 /* 744 * We know each entry in t_data_sg contains a page. 745 */ 746 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 747 page_off = (data_offset % PAGE_SIZE); 748 749 cmd->first_data_sg = sg; 750 cmd->first_data_sg_off = page_off; 751 752 while (data_length) { 753 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 754 755 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 756 iov[i].iov_len = cur_len; 757 758 data_length -= cur_len; 759 page_off = 0; 760 sg = sg_next(sg); 761 i++; 762 } 763 764 cmd->kmapped_nents = i; 765 766 return i; 767 } 768 769 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 770 { 771 u32 i; 772 struct scatterlist *sg; 773 774 sg = cmd->first_data_sg; 775 776 for (i = 0; i < cmd->kmapped_nents; i++) 777 kunmap(sg_page(&sg[i])); 778 } 779 780 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 781 { 782 struct iscsi_cmd *cmd; 783 784 conn->exp_statsn = exp_statsn; 785 786 if (conn->sess->sess_ops->RDMAExtensions) 787 return; 788 789 spin_lock_bh(&conn->cmd_lock); 790 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 791 spin_lock(&cmd->istate_lock); 792 if ((cmd->i_state == ISTATE_SENT_STATUS) && 793 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 794 cmd->i_state = ISTATE_REMOVE; 795 spin_unlock(&cmd->istate_lock); 796 iscsit_add_cmd_to_immediate_queue(cmd, conn, 797 cmd->i_state); 798 continue; 799 } 800 spin_unlock(&cmd->istate_lock); 801 } 802 spin_unlock_bh(&conn->cmd_lock); 803 } 804 805 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 806 { 807 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 808 809 iov_count += ISCSI_IOV_DATA_BUFFER; 810 811 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 812 if (!cmd->iov_data) { 813 pr_err("Unable to allocate cmd->iov_data\n"); 814 return -ENOMEM; 815 } 816 817 cmd->orig_iov_data_count = iov_count; 818 return 0; 819 } 820 821 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 822 unsigned char *buf) 823 { 824 int data_direction, payload_length; 825 struct iscsi_scsi_req *hdr; 826 int iscsi_task_attr; 827 int sam_task_attr; 828 829 spin_lock_bh(&conn->sess->session_stats_lock); 830 conn->sess->cmd_pdus++; 831 if (conn->sess->se_sess->se_node_acl) { 832 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 833 conn->sess->se_sess->se_node_acl->num_cmds++; 834 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 835 } 836 spin_unlock_bh(&conn->sess->session_stats_lock); 837 838 hdr = (struct iscsi_scsi_req *) buf; 839 payload_length = ntoh24(hdr->dlength); 840 841 /* FIXME; Add checks for AdditionalHeaderSegment */ 842 843 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 844 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 845 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 846 " not set. Bad iSCSI Initiator.\n"); 847 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 848 1, 1, buf, cmd); 849 } 850 851 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 852 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 853 /* 854 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) 855 * that adds support for RESERVE/RELEASE. There is a bug 856 * add with this new functionality that sets R/W bits when 857 * neither CDB carries any READ or WRITE datapayloads. 858 */ 859 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { 860 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 861 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 862 goto done; 863 } 864 865 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 866 " set when Expected Data Transfer Length is 0 for" 867 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); 868 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 869 1, 1, buf, cmd); 870 } 871 done: 872 873 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 874 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 875 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 876 " MUST be set if Expected Data Transfer Length is not 0." 877 " Bad iSCSI Initiator\n"); 878 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 879 1, 1, buf, cmd); 880 } 881 882 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 883 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 884 pr_err("Bidirectional operations not supported!\n"); 885 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 886 1, 1, buf, cmd); 887 } 888 889 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 890 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 891 " Scsi Command PDU.\n"); 892 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 893 1, 1, buf, cmd); 894 } 895 896 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 897 pr_err("ImmediateData=No but DataSegmentLength=%u," 898 " protocol error.\n", payload_length); 899 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 900 1, 1, buf, cmd); 901 } 902 903 if ((be32_to_cpu(hdr->data_length )== payload_length) && 904 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 905 pr_err("Expected Data Transfer Length and Length of" 906 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 907 " bit is not set protocol error\n"); 908 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 909 1, 1, buf, cmd); 910 } 911 912 if (payload_length > be32_to_cpu(hdr->data_length)) { 913 pr_err("DataSegmentLength: %u is greater than" 914 " EDTL: %u, protocol error.\n", payload_length, 915 hdr->data_length); 916 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 917 1, 1, buf, cmd); 918 } 919 920 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 921 pr_err("DataSegmentLength: %u is greater than" 922 " MaxXmitDataSegmentLength: %u, protocol error.\n", 923 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 924 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 925 1, 1, buf, cmd); 926 } 927 928 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 929 pr_err("DataSegmentLength: %u is greater than" 930 " FirstBurstLength: %u, protocol error.\n", 931 payload_length, conn->sess->sess_ops->FirstBurstLength); 932 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 933 1, 1, buf, cmd); 934 } 935 936 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 937 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 938 DMA_NONE; 939 940 cmd->data_direction = data_direction; 941 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 942 /* 943 * Figure out the SAM Task Attribute for the incoming SCSI CDB 944 */ 945 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 946 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 947 sam_task_attr = MSG_SIMPLE_TAG; 948 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 949 sam_task_attr = MSG_ORDERED_TAG; 950 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 951 sam_task_attr = MSG_HEAD_TAG; 952 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 953 sam_task_attr = MSG_ACA_TAG; 954 else { 955 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 956 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 957 sam_task_attr = MSG_SIMPLE_TAG; 958 } 959 960 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 961 cmd->i_state = ISTATE_NEW_CMD; 962 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 963 cmd->immediate_data = (payload_length) ? 1 : 0; 964 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 965 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 966 if (cmd->unsolicited_data) 967 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 968 969 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 970 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 971 spin_lock_bh(&conn->sess->ttt_lock); 972 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 973 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 974 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 975 spin_unlock_bh(&conn->sess->ttt_lock); 976 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 977 cmd->targ_xfer_tag = 0xFFFFFFFF; 978 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 979 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 980 cmd->first_burst_len = payload_length; 981 982 if (!conn->sess->sess_ops->RDMAExtensions && 983 cmd->data_direction == DMA_FROM_DEVICE) { 984 struct iscsi_datain_req *dr; 985 986 dr = iscsit_allocate_datain_req(); 987 if (!dr) 988 return iscsit_add_reject_from_cmd( 989 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 990 1, 1, buf, cmd); 991 992 iscsit_attach_datain_req(cmd, dr); 993 } 994 995 /* 996 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 997 */ 998 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 999 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1000 cmd->data_direction, sam_task_attr, 1001 cmd->sense_buffer + 2); 1002 1003 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1004 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1005 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1006 conn->cid); 1007 1008 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true); 1009 1010 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1011 scsilun_to_int(&hdr->lun)); 1012 if (cmd->sense_reason) 1013 goto attach_cmd; 1014 1015 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1016 if (cmd->sense_reason) { 1017 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1018 return iscsit_add_reject_from_cmd( 1019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1020 1, 1, buf, cmd); 1021 } 1022 1023 goto attach_cmd; 1024 } 1025 1026 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1027 return iscsit_add_reject_from_cmd( 1028 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1029 1, 1, buf, cmd); 1030 } 1031 1032 attach_cmd: 1033 spin_lock_bh(&conn->cmd_lock); 1034 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1035 spin_unlock_bh(&conn->cmd_lock); 1036 /* 1037 * Check if we need to delay processing because of ALUA 1038 * Active/NonOptimized primary access state.. 1039 */ 1040 core_alua_check_nonop_delay(&cmd->se_cmd); 1041 1042 return 0; 1043 } 1044 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1045 1046 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1047 { 1048 iscsit_set_dataout_sequence_values(cmd); 1049 1050 spin_lock_bh(&cmd->dataout_timeout_lock); 1051 iscsit_start_dataout_timer(cmd, cmd->conn); 1052 spin_unlock_bh(&cmd->dataout_timeout_lock); 1053 } 1054 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1055 1056 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1057 struct iscsi_scsi_req *hdr) 1058 { 1059 int cmdsn_ret = 0; 1060 /* 1061 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1062 * the Immediate Bit is not set, and no Immediate 1063 * Data is attached. 1064 * 1065 * A PDU/CmdSN carrying Immediate Data can only 1066 * be processed after the DataCRC has passed. 1067 * If the DataCRC fails, the CmdSN MUST NOT 1068 * be acknowledged. (See below) 1069 */ 1070 if (!cmd->immediate_data) { 1071 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1072 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1073 if (!cmd->sense_reason) 1074 return 0; 1075 1076 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1077 return 0; 1078 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 1079 return iscsit_add_reject_from_cmd( 1080 ISCSI_REASON_PROTOCOL_ERROR, 1081 1, 0, (unsigned char *)hdr, cmd); 1082 } 1083 } 1084 1085 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1086 1087 /* 1088 * If no Immediate Data is attached, it's OK to return now. 1089 */ 1090 if (!cmd->immediate_data) { 1091 if (!cmd->sense_reason && cmd->unsolicited_data) 1092 iscsit_set_unsoliticed_dataout(cmd); 1093 if (!cmd->sense_reason) 1094 return 0; 1095 1096 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1097 return 0; 1098 } 1099 1100 /* 1101 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1102 * execution. These exceptions are processed in CmdSN order using 1103 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1104 */ 1105 if (cmd->sense_reason) { 1106 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1107 return 1; 1108 } 1109 /* 1110 * Call directly into transport_generic_new_cmd() to perform 1111 * the backend memory allocation. 1112 */ 1113 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1114 if (cmd->sense_reason) { 1115 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd); 1116 return 1; 1117 } 1118 1119 return 0; 1120 } 1121 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1122 1123 static int 1124 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1125 bool dump_payload) 1126 { 1127 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1128 /* 1129 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1130 */ 1131 if (dump_payload == true) 1132 goto after_immediate_data; 1133 1134 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1135 cmd->first_burst_len); 1136 after_immediate_data: 1137 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1138 /* 1139 * A PDU/CmdSN carrying Immediate Data passed 1140 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1141 * Immediate Bit is not set. 1142 */ 1143 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn); 1144 1145 if (cmd->sense_reason) { 1146 if (iscsit_dump_data_payload(cmd->conn, 1147 cmd->first_burst_len, 1) < 0) 1148 return -1; 1149 } else if (cmd->unsolicited_data) 1150 iscsit_set_unsoliticed_dataout(cmd); 1151 1152 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1153 return iscsit_add_reject_from_cmd( 1154 ISCSI_REASON_PROTOCOL_ERROR, 1155 1, 0, (unsigned char *)hdr, cmd); 1156 1157 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1158 /* 1159 * Immediate Data failed DataCRC and ERL>=1, 1160 * silently drop this PDU and let the initiator 1161 * plug the CmdSN gap. 1162 * 1163 * FIXME: Send Unsolicited NOPIN with reserved 1164 * TTT here to help the initiator figure out 1165 * the missing CmdSN, although they should be 1166 * intelligent enough to determine the missing 1167 * CmdSN and issue a retry to plug the sequence. 1168 */ 1169 cmd->i_state = ISTATE_REMOVE; 1170 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1171 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1172 return -1; 1173 1174 return 0; 1175 } 1176 1177 static int 1178 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1179 unsigned char *buf) 1180 { 1181 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1182 int rc, immed_data; 1183 bool dump_payload = false; 1184 1185 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1186 if (rc < 0) 1187 return rc; 1188 /* 1189 * Allocation iovecs needed for struct socket operations for 1190 * traditional iSCSI block I/O. 1191 */ 1192 if (iscsit_allocate_iovecs(cmd) < 0) { 1193 return iscsit_add_reject_from_cmd( 1194 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1195 1, 0, buf, cmd); 1196 } 1197 immed_data = cmd->immediate_data; 1198 1199 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1200 if (rc < 0) 1201 return rc; 1202 else if (rc > 0) 1203 dump_payload = true; 1204 1205 if (!immed_data) 1206 return 0; 1207 1208 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1209 } 1210 1211 static u32 iscsit_do_crypto_hash_sg( 1212 struct hash_desc *hash, 1213 struct iscsi_cmd *cmd, 1214 u32 data_offset, 1215 u32 data_length, 1216 u32 padding, 1217 u8 *pad_bytes) 1218 { 1219 u32 data_crc; 1220 u32 i; 1221 struct scatterlist *sg; 1222 unsigned int page_off; 1223 1224 crypto_hash_init(hash); 1225 1226 sg = cmd->first_data_sg; 1227 page_off = cmd->first_data_sg_off; 1228 1229 i = 0; 1230 while (data_length) { 1231 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1232 1233 crypto_hash_update(hash, &sg[i], cur_len); 1234 1235 data_length -= cur_len; 1236 page_off = 0; 1237 i++; 1238 } 1239 1240 if (padding) { 1241 struct scatterlist pad_sg; 1242 1243 sg_init_one(&pad_sg, pad_bytes, padding); 1244 crypto_hash_update(hash, &pad_sg, padding); 1245 } 1246 crypto_hash_final(hash, (u8 *) &data_crc); 1247 1248 return data_crc; 1249 } 1250 1251 static void iscsit_do_crypto_hash_buf( 1252 struct hash_desc *hash, 1253 const void *buf, 1254 u32 payload_length, 1255 u32 padding, 1256 u8 *pad_bytes, 1257 u8 *data_crc) 1258 { 1259 struct scatterlist sg; 1260 1261 crypto_hash_init(hash); 1262 1263 sg_init_one(&sg, buf, payload_length); 1264 crypto_hash_update(hash, &sg, payload_length); 1265 1266 if (padding) { 1267 sg_init_one(&sg, pad_bytes, padding); 1268 crypto_hash_update(hash, &sg, padding); 1269 } 1270 crypto_hash_final(hash, data_crc); 1271 } 1272 1273 int 1274 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1275 struct iscsi_cmd **out_cmd) 1276 { 1277 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1278 struct iscsi_cmd *cmd = NULL; 1279 struct se_cmd *se_cmd; 1280 unsigned long flags; 1281 u32 payload_length = ntoh24(hdr->dlength); 1282 int rc; 1283 1284 if (!payload_length) { 1285 pr_err("DataOUT payload is ZERO, protocol error.\n"); 1286 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1287 buf, conn); 1288 } 1289 1290 /* iSCSI write */ 1291 spin_lock_bh(&conn->sess->session_stats_lock); 1292 conn->sess->rx_data_octets += payload_length; 1293 if (conn->sess->se_sess->se_node_acl) { 1294 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 1295 conn->sess->se_sess->se_node_acl->write_bytes += payload_length; 1296 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 1297 } 1298 spin_unlock_bh(&conn->sess->session_stats_lock); 1299 1300 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1301 pr_err("DataSegmentLength: %u is greater than" 1302 " MaxXmitDataSegmentLength: %u\n", payload_length, 1303 conn->conn_ops->MaxXmitDataSegmentLength); 1304 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1305 buf, conn); 1306 } 1307 1308 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1309 payload_length); 1310 if (!cmd) 1311 return 0; 1312 1313 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1314 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1315 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1316 payload_length, conn->cid); 1317 1318 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1319 pr_err("Command ITT: 0x%08x received DataOUT after" 1320 " last DataOUT received, dumping payload\n", 1321 cmd->init_task_tag); 1322 return iscsit_dump_data_payload(conn, payload_length, 1); 1323 } 1324 1325 if (cmd->data_direction != DMA_TO_DEVICE) { 1326 pr_err("Command ITT: 0x%08x received DataOUT for a" 1327 " NON-WRITE command.\n", cmd->init_task_tag); 1328 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 1329 1, 0, buf, cmd); 1330 } 1331 se_cmd = &cmd->se_cmd; 1332 iscsit_mod_dataout_timer(cmd); 1333 1334 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1335 pr_err("DataOut Offset: %u, Length %u greater than" 1336 " iSCSI Command EDTL %u, protocol error.\n", 1337 hdr->offset, payload_length, cmd->se_cmd.data_length); 1338 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 1339 1, 0, buf, cmd); 1340 } 1341 1342 if (cmd->unsolicited_data) { 1343 int dump_unsolicited_data = 0; 1344 1345 if (conn->sess->sess_ops->InitialR2T) { 1346 pr_err("Received unexpected unsolicited data" 1347 " while InitialR2T=Yes, protocol error.\n"); 1348 transport_send_check_condition_and_sense(&cmd->se_cmd, 1349 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1350 return -1; 1351 } 1352 /* 1353 * Special case for dealing with Unsolicited DataOUT 1354 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1355 * failures; 1356 */ 1357 1358 /* Something's amiss if we're not in WRITE_PENDING state... */ 1359 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1360 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1361 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1362 1363 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1364 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1365 dump_unsolicited_data = 1; 1366 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1367 1368 if (dump_unsolicited_data) { 1369 /* 1370 * Check if a delayed TASK_ABORTED status needs to 1371 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1372 * received with the unsolicitied data out. 1373 */ 1374 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1375 iscsit_stop_dataout_timer(cmd); 1376 1377 transport_check_aborted_status(se_cmd, 1378 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1379 return iscsit_dump_data_payload(conn, payload_length, 1); 1380 } 1381 } else { 1382 /* 1383 * For the normal solicited data path: 1384 * 1385 * Check for a delayed TASK_ABORTED status and dump any 1386 * incoming data out payload if one exists. Also, when the 1387 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1388 * data out sequence, we decrement outstanding_r2ts. Once 1389 * outstanding_r2ts reaches zero, go ahead and send the delayed 1390 * TASK_ABORTED status. 1391 */ 1392 if (se_cmd->transport_state & CMD_T_ABORTED) { 1393 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1394 if (--cmd->outstanding_r2ts < 1) { 1395 iscsit_stop_dataout_timer(cmd); 1396 transport_check_aborted_status( 1397 se_cmd, 1); 1398 } 1399 1400 return iscsit_dump_data_payload(conn, payload_length, 1); 1401 } 1402 } 1403 /* 1404 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1405 * within-command recovery checks before receiving the payload. 1406 */ 1407 rc = iscsit_check_pre_dataout(cmd, buf); 1408 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1409 return 0; 1410 else if (rc == DATAOUT_CANNOT_RECOVER) 1411 return -1; 1412 1413 *out_cmd = cmd; 1414 return 0; 1415 } 1416 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1417 1418 static int 1419 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1420 struct iscsi_data *hdr) 1421 { 1422 struct kvec *iov; 1423 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1424 u32 payload_length = ntoh24(hdr->dlength); 1425 int iov_ret, data_crc_failed = 0; 1426 1427 rx_size += payload_length; 1428 iov = &cmd->iov_data[0]; 1429 1430 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1431 payload_length); 1432 if (iov_ret < 0) 1433 return -1; 1434 1435 iov_count += iov_ret; 1436 1437 padding = ((-payload_length) & 3); 1438 if (padding != 0) { 1439 iov[iov_count].iov_base = cmd->pad_bytes; 1440 iov[iov_count++].iov_len = padding; 1441 rx_size += padding; 1442 pr_debug("Receiving %u padding bytes.\n", padding); 1443 } 1444 1445 if (conn->conn_ops->DataDigest) { 1446 iov[iov_count].iov_base = &checksum; 1447 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1448 rx_size += ISCSI_CRC_LEN; 1449 } 1450 1451 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1452 1453 iscsit_unmap_iovec(cmd); 1454 1455 if (rx_got != rx_size) 1456 return -1; 1457 1458 if (conn->conn_ops->DataDigest) { 1459 u32 data_crc; 1460 1461 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1462 be32_to_cpu(hdr->offset), 1463 payload_length, padding, 1464 cmd->pad_bytes); 1465 1466 if (checksum != data_crc) { 1467 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1468 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1469 " does not match computed 0x%08x\n", 1470 hdr->itt, hdr->offset, payload_length, 1471 hdr->datasn, checksum, data_crc); 1472 data_crc_failed = 1; 1473 } else { 1474 pr_debug("Got CRC32C DataDigest 0x%08x for" 1475 " %u bytes of Data Out\n", checksum, 1476 payload_length); 1477 } 1478 } 1479 1480 return data_crc_failed; 1481 } 1482 1483 int 1484 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1485 bool data_crc_failed) 1486 { 1487 struct iscsi_conn *conn = cmd->conn; 1488 int rc, ooo_cmdsn; 1489 /* 1490 * Increment post receive data and CRC values or perform 1491 * within-command recovery. 1492 */ 1493 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1494 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1495 return 0; 1496 else if (rc == DATAOUT_SEND_R2T) { 1497 iscsit_set_dataout_sequence_values(cmd); 1498 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1499 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1500 /* 1501 * Handle extra special case for out of order 1502 * Unsolicited Data Out. 1503 */ 1504 spin_lock_bh(&cmd->istate_lock); 1505 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1506 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1507 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1508 spin_unlock_bh(&cmd->istate_lock); 1509 1510 iscsit_stop_dataout_timer(cmd); 1511 if (ooo_cmdsn) 1512 return 0; 1513 target_execute_cmd(&cmd->se_cmd); 1514 return 0; 1515 } else /* DATAOUT_CANNOT_RECOVER */ 1516 return -1; 1517 1518 return 0; 1519 } 1520 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1521 1522 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1523 { 1524 struct iscsi_cmd *cmd; 1525 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1526 int rc; 1527 bool data_crc_failed = false; 1528 1529 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1530 if (rc < 0) 1531 return rc; 1532 else if (!cmd) 1533 return 0; 1534 1535 rc = iscsit_get_dataout(conn, cmd, hdr); 1536 if (rc < 0) 1537 return rc; 1538 else if (rc > 0) 1539 data_crc_failed = true; 1540 1541 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1542 } 1543 1544 int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1545 unsigned char *buf) 1546 { 1547 unsigned char *ping_data = NULL; 1548 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size; 1549 u32 checksum, data_crc, padding = 0, payload_length; 1550 struct iscsi_cmd *cmd_p = NULL; 1551 struct kvec *iov = NULL; 1552 struct iscsi_nopout *hdr; 1553 1554 hdr = (struct iscsi_nopout *) buf; 1555 payload_length = ntoh24(hdr->dlength); 1556 1557 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1558 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1559 " not set, protocol error.\n"); 1560 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1561 buf, conn); 1562 } 1563 1564 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1565 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1566 " greater than MaxXmitDataSegmentLength: %u, protocol" 1567 " error.\n", payload_length, 1568 conn->conn_ops->MaxXmitDataSegmentLength); 1569 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1570 buf, conn); 1571 } 1572 1573 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1574 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1575 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1576 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1577 payload_length); 1578 /* 1579 * This is not a response to a Unsolicited NopIN, which means 1580 * it can either be a NOPOUT ping request (with a valid ITT), 1581 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1582 * Either way, make sure we allocate an struct iscsi_cmd, as both 1583 * can contain ping data. 1584 */ 1585 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1586 if (!cmd) 1587 return iscsit_add_reject( 1588 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1589 1, buf, conn); 1590 1591 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1592 cmd->i_state = ISTATE_SEND_NOPIN; 1593 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1594 1 : 0); 1595 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1596 cmd->targ_xfer_tag = 0xFFFFFFFF; 1597 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1598 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1599 cmd->data_direction = DMA_NONE; 1600 } 1601 1602 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1603 rx_size = payload_length; 1604 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1605 if (!ping_data) { 1606 pr_err("Unable to allocate memory for" 1607 " NOPOUT ping data.\n"); 1608 ret = -1; 1609 goto out; 1610 } 1611 1612 iov = &cmd->iov_misc[0]; 1613 iov[niov].iov_base = ping_data; 1614 iov[niov++].iov_len = payload_length; 1615 1616 padding = ((-payload_length) & 3); 1617 if (padding != 0) { 1618 pr_debug("Receiving %u additional bytes" 1619 " for padding.\n", padding); 1620 iov[niov].iov_base = &cmd->pad_bytes; 1621 iov[niov++].iov_len = padding; 1622 rx_size += padding; 1623 } 1624 if (conn->conn_ops->DataDigest) { 1625 iov[niov].iov_base = &checksum; 1626 iov[niov++].iov_len = ISCSI_CRC_LEN; 1627 rx_size += ISCSI_CRC_LEN; 1628 } 1629 1630 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1631 if (rx_got != rx_size) { 1632 ret = -1; 1633 goto out; 1634 } 1635 1636 if (conn->conn_ops->DataDigest) { 1637 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1638 ping_data, payload_length, 1639 padding, cmd->pad_bytes, 1640 (u8 *)&data_crc); 1641 1642 if (checksum != data_crc) { 1643 pr_err("Ping data CRC32C DataDigest" 1644 " 0x%08x does not match computed 0x%08x\n", 1645 checksum, data_crc); 1646 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1647 pr_err("Unable to recover from" 1648 " NOPOUT Ping DataCRC failure while in" 1649 " ERL=0.\n"); 1650 ret = -1; 1651 goto out; 1652 } else { 1653 /* 1654 * Silently drop this PDU and let the 1655 * initiator plug the CmdSN gap. 1656 */ 1657 pr_debug("Dropping NOPOUT" 1658 " Command CmdSN: 0x%08x due to" 1659 " DataCRC error.\n", hdr->cmdsn); 1660 ret = 0; 1661 goto out; 1662 } 1663 } else { 1664 pr_debug("Got CRC32C DataDigest" 1665 " 0x%08x for %u bytes of ping data.\n", 1666 checksum, payload_length); 1667 } 1668 } 1669 1670 ping_data[payload_length] = '\0'; 1671 /* 1672 * Attach ping data to struct iscsi_cmd->buf_ptr. 1673 */ 1674 cmd->buf_ptr = ping_data; 1675 cmd->buf_ptr_size = payload_length; 1676 1677 pr_debug("Got %u bytes of NOPOUT ping" 1678 " data.\n", payload_length); 1679 pr_debug("Ping Data: \"%s\"\n", ping_data); 1680 } 1681 1682 if (hdr->itt != RESERVED_ITT) { 1683 if (!cmd) { 1684 pr_err("Checking CmdSN for NOPOUT," 1685 " but cmd is NULL!\n"); 1686 return -1; 1687 } 1688 /* 1689 * Initiator is expecting a NopIN ping reply, 1690 */ 1691 spin_lock_bh(&conn->cmd_lock); 1692 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1693 spin_unlock_bh(&conn->cmd_lock); 1694 1695 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1696 1697 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1698 iscsit_add_cmd_to_response_queue(cmd, conn, 1699 cmd->i_state); 1700 return 0; 1701 } 1702 1703 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1704 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1705 ret = 0; 1706 goto ping_out; 1707 } 1708 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1709 return iscsit_add_reject_from_cmd( 1710 ISCSI_REASON_PROTOCOL_ERROR, 1711 1, 0, buf, cmd); 1712 1713 return 0; 1714 } 1715 1716 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1717 /* 1718 * This was a response to a unsolicited NOPIN ping. 1719 */ 1720 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1721 if (!cmd_p) 1722 return -1; 1723 1724 iscsit_stop_nopin_response_timer(conn); 1725 1726 cmd_p->i_state = ISTATE_REMOVE; 1727 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1728 iscsit_start_nopin_timer(conn); 1729 } else { 1730 /* 1731 * Initiator is not expecting a NOPIN is response. 1732 * Just ignore for now. 1733 * 1734 * iSCSI v19-91 10.18 1735 * "A NOP-OUT may also be used to confirm a changed 1736 * ExpStatSN if another PDU will not be available 1737 * for a long time." 1738 */ 1739 ret = 0; 1740 goto out; 1741 } 1742 1743 return 0; 1744 out: 1745 if (cmd) 1746 iscsit_free_cmd(cmd, false); 1747 ping_out: 1748 kfree(ping_data); 1749 return ret; 1750 } 1751 EXPORT_SYMBOL(iscsit_handle_nop_out); 1752 1753 int 1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1755 unsigned char *buf) 1756 { 1757 struct se_tmr_req *se_tmr; 1758 struct iscsi_tmr_req *tmr_req; 1759 struct iscsi_tm *hdr; 1760 int out_of_order_cmdsn = 0; 1761 int ret; 1762 u8 function; 1763 1764 hdr = (struct iscsi_tm *) buf; 1765 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1766 function = hdr->flags; 1767 1768 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1769 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1770 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1771 hdr->rtt, hdr->refcmdsn, conn->cid); 1772 1773 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1774 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1775 hdr->rtt != RESERVED_ITT)) { 1776 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1777 hdr->rtt = RESERVED_ITT; 1778 } 1779 1780 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1781 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1782 pr_err("Task Management Request TASK_REASSIGN not" 1783 " issued as immediate command, bad iSCSI Initiator" 1784 "implementation\n"); 1785 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 1786 1, 1, buf, cmd); 1787 } 1788 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1789 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1790 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1791 1792 cmd->data_direction = DMA_NONE; 1793 1794 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1795 if (!cmd->tmr_req) { 1796 pr_err("Unable to allocate memory for" 1797 " Task Management command!\n"); 1798 return iscsit_add_reject_from_cmd( 1799 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1800 1, 1, buf, cmd); 1801 } 1802 1803 /* 1804 * TASK_REASSIGN for ERL=2 / connection stays inside of 1805 * LIO-Target $FABRIC_MOD 1806 */ 1807 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1808 1809 u8 tcm_function; 1810 int ret; 1811 1812 transport_init_se_cmd(&cmd->se_cmd, 1813 &lio_target_fabric_configfs->tf_ops, 1814 conn->sess->se_sess, 0, DMA_NONE, 1815 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1816 1817 switch (function) { 1818 case ISCSI_TM_FUNC_ABORT_TASK: 1819 tcm_function = TMR_ABORT_TASK; 1820 break; 1821 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1822 tcm_function = TMR_ABORT_TASK_SET; 1823 break; 1824 case ISCSI_TM_FUNC_CLEAR_ACA: 1825 tcm_function = TMR_CLEAR_ACA; 1826 break; 1827 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1828 tcm_function = TMR_CLEAR_TASK_SET; 1829 break; 1830 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1831 tcm_function = TMR_LUN_RESET; 1832 break; 1833 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1834 tcm_function = TMR_TARGET_WARM_RESET; 1835 break; 1836 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1837 tcm_function = TMR_TARGET_COLD_RESET; 1838 break; 1839 default: 1840 pr_err("Unknown iSCSI TMR Function:" 1841 " 0x%02x\n", function); 1842 return iscsit_add_reject_from_cmd( 1843 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1844 1, 1, buf, cmd); 1845 } 1846 1847 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1848 tcm_function, GFP_KERNEL); 1849 if (ret < 0) 1850 return iscsit_add_reject_from_cmd( 1851 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1852 1, 1, buf, cmd); 1853 1854 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1855 } 1856 1857 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1858 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1859 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1860 cmd->init_task_tag = hdr->itt; 1861 cmd->targ_xfer_tag = 0xFFFFFFFF; 1862 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1863 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1864 se_tmr = cmd->se_cmd.se_tmr_req; 1865 tmr_req = cmd->tmr_req; 1866 /* 1867 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1868 */ 1869 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1870 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1871 scsilun_to_int(&hdr->lun)); 1872 if (ret < 0) { 1873 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1874 goto attach; 1875 } 1876 } 1877 1878 switch (function) { 1879 case ISCSI_TM_FUNC_ABORT_TASK: 1880 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1881 if (se_tmr->response) 1882 goto attach; 1883 break; 1884 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1885 case ISCSI_TM_FUNC_CLEAR_ACA: 1886 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1887 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1888 break; 1889 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1890 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1891 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1892 goto attach; 1893 } 1894 break; 1895 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1896 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1897 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1898 goto attach; 1899 } 1900 break; 1901 case ISCSI_TM_FUNC_TASK_REASSIGN: 1902 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1903 /* 1904 * Perform sanity checks on the ExpDataSN only if the 1905 * TASK_REASSIGN was successful. 1906 */ 1907 if (se_tmr->response) 1908 break; 1909 1910 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1911 return iscsit_add_reject_from_cmd( 1912 ISCSI_REASON_BOOKMARK_INVALID, 1, 1, 1913 buf, cmd); 1914 break; 1915 default: 1916 pr_err("Unknown TMR function: 0x%02x, protocol" 1917 " error.\n", function); 1918 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1919 goto attach; 1920 } 1921 1922 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1923 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1924 se_tmr->call_transport = 1; 1925 attach: 1926 spin_lock_bh(&conn->cmd_lock); 1927 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1928 spin_unlock_bh(&conn->cmd_lock); 1929 1930 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1931 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1932 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1933 out_of_order_cmdsn = 1; 1934 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1935 return 0; 1936 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1937 return iscsit_add_reject_from_cmd( 1938 ISCSI_REASON_PROTOCOL_ERROR, 1939 1, 0, buf, cmd); 1940 } 1941 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1942 1943 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1944 return 0; 1945 /* 1946 * Found the referenced task, send to transport for processing. 1947 */ 1948 if (se_tmr->call_transport) 1949 return transport_generic_handle_tmr(&cmd->se_cmd); 1950 1951 /* 1952 * Could not find the referenced LUN, task, or Task Management 1953 * command not authorized or supported. Change state and 1954 * let the tx_thread send the response. 1955 * 1956 * For connection recovery, this is also the default action for 1957 * TMR TASK_REASSIGN. 1958 */ 1959 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1960 return 0; 1961 } 1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 1963 1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1965 static int iscsit_handle_text_cmd( 1966 struct iscsi_conn *conn, 1967 unsigned char *buf) 1968 { 1969 char *text_ptr, *text_in; 1970 int cmdsn_ret, niov = 0, rx_got, rx_size; 1971 u32 checksum = 0, data_crc = 0, payload_length; 1972 u32 padding = 0, pad_bytes = 0, text_length = 0; 1973 struct iscsi_cmd *cmd; 1974 struct kvec iov[3]; 1975 struct iscsi_text *hdr; 1976 1977 hdr = (struct iscsi_text *) buf; 1978 payload_length = ntoh24(hdr->dlength); 1979 1980 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1981 pr_err("Unable to accept text parameter length: %u" 1982 "greater than MaxXmitDataSegmentLength %u.\n", 1983 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1984 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1985 buf, conn); 1986 } 1987 1988 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1989 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1990 hdr->exp_statsn, payload_length); 1991 1992 rx_size = text_length = payload_length; 1993 if (text_length) { 1994 text_in = kzalloc(text_length, GFP_KERNEL); 1995 if (!text_in) { 1996 pr_err("Unable to allocate memory for" 1997 " incoming text parameters\n"); 1998 return -1; 1999 } 2000 2001 memset(iov, 0, 3 * sizeof(struct kvec)); 2002 iov[niov].iov_base = text_in; 2003 iov[niov++].iov_len = text_length; 2004 2005 padding = ((-payload_length) & 3); 2006 if (padding != 0) { 2007 iov[niov].iov_base = &pad_bytes; 2008 iov[niov++].iov_len = padding; 2009 rx_size += padding; 2010 pr_debug("Receiving %u additional bytes" 2011 " for padding.\n", padding); 2012 } 2013 if (conn->conn_ops->DataDigest) { 2014 iov[niov].iov_base = &checksum; 2015 iov[niov++].iov_len = ISCSI_CRC_LEN; 2016 rx_size += ISCSI_CRC_LEN; 2017 } 2018 2019 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2020 if (rx_got != rx_size) { 2021 kfree(text_in); 2022 return -1; 2023 } 2024 2025 if (conn->conn_ops->DataDigest) { 2026 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 2027 text_in, text_length, 2028 padding, (u8 *)&pad_bytes, 2029 (u8 *)&data_crc); 2030 2031 if (checksum != data_crc) { 2032 pr_err("Text data CRC32C DataDigest" 2033 " 0x%08x does not match computed" 2034 " 0x%08x\n", checksum, data_crc); 2035 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2036 pr_err("Unable to recover from" 2037 " Text Data digest failure while in" 2038 " ERL=0.\n"); 2039 kfree(text_in); 2040 return -1; 2041 } else { 2042 /* 2043 * Silently drop this PDU and let the 2044 * initiator plug the CmdSN gap. 2045 */ 2046 pr_debug("Dropping Text" 2047 " Command CmdSN: 0x%08x due to" 2048 " DataCRC error.\n", hdr->cmdsn); 2049 kfree(text_in); 2050 return 0; 2051 } 2052 } else { 2053 pr_debug("Got CRC32C DataDigest" 2054 " 0x%08x for %u bytes of text data.\n", 2055 checksum, text_length); 2056 } 2057 } 2058 text_in[text_length - 1] = '\0'; 2059 pr_debug("Successfully read %d bytes of text" 2060 " data.\n", text_length); 2061 2062 if (strncmp("SendTargets", text_in, 11) != 0) { 2063 pr_err("Received Text Data that is not" 2064 " SendTargets, cannot continue.\n"); 2065 kfree(text_in); 2066 return -1; 2067 } 2068 text_ptr = strchr(text_in, '='); 2069 if (!text_ptr) { 2070 pr_err("No \"=\" separator found in Text Data," 2071 " cannot continue.\n"); 2072 kfree(text_in); 2073 return -1; 2074 } 2075 if (strncmp("=All", text_ptr, 4) != 0) { 2076 pr_err("Unable to locate All value for" 2077 " SendTargets key, cannot continue.\n"); 2078 kfree(text_in); 2079 return -1; 2080 } 2081 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */ 2082 kfree(text_in); 2083 } 2084 2085 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 2086 if (!cmd) 2087 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2088 1, buf, conn); 2089 2090 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2091 cmd->i_state = ISTATE_SEND_TEXTRSP; 2092 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2093 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2094 cmd->targ_xfer_tag = 0xFFFFFFFF; 2095 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2096 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2097 cmd->data_direction = DMA_NONE; 2098 2099 spin_lock_bh(&conn->cmd_lock); 2100 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2101 spin_unlock_bh(&conn->cmd_lock); 2102 2103 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2104 2105 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2106 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 2107 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2108 return iscsit_add_reject_from_cmd( 2109 ISCSI_REASON_PROTOCOL_ERROR, 2110 1, 0, buf, cmd); 2111 2112 return 0; 2113 } 2114 2115 return iscsit_execute_cmd(cmd, 0); 2116 } 2117 2118 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2119 { 2120 struct iscsi_conn *conn_p; 2121 struct iscsi_session *sess = conn->sess; 2122 2123 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2124 " for SID: %u.\n", conn->cid, conn->sess->sid); 2125 2126 atomic_set(&sess->session_logout, 1); 2127 atomic_set(&conn->conn_logout_remove, 1); 2128 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2129 2130 iscsit_inc_conn_usage_count(conn); 2131 iscsit_inc_session_usage_count(sess); 2132 2133 spin_lock_bh(&sess->conn_lock); 2134 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2135 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2136 continue; 2137 2138 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2139 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2140 } 2141 spin_unlock_bh(&sess->conn_lock); 2142 2143 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2144 2145 return 0; 2146 } 2147 2148 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2149 { 2150 struct iscsi_conn *l_conn; 2151 struct iscsi_session *sess = conn->sess; 2152 2153 pr_debug("Received logout request CLOSECONNECTION for CID:" 2154 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2155 2156 /* 2157 * A Logout Request with a CLOSECONNECTION reason code for a CID 2158 * can arrive on a connection with a differing CID. 2159 */ 2160 if (conn->cid == cmd->logout_cid) { 2161 spin_lock_bh(&conn->state_lock); 2162 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2163 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2164 2165 atomic_set(&conn->conn_logout_remove, 1); 2166 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2167 iscsit_inc_conn_usage_count(conn); 2168 2169 spin_unlock_bh(&conn->state_lock); 2170 } else { 2171 /* 2172 * Handle all different cid CLOSECONNECTION requests in 2173 * iscsit_logout_post_handler_diffcid() as to give enough 2174 * time for any non immediate command's CmdSN to be 2175 * acknowledged on the connection in question. 2176 * 2177 * Here we simply make sure the CID is still around. 2178 */ 2179 l_conn = iscsit_get_conn_from_cid(sess, 2180 cmd->logout_cid); 2181 if (!l_conn) { 2182 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2183 iscsit_add_cmd_to_response_queue(cmd, conn, 2184 cmd->i_state); 2185 return 0; 2186 } 2187 2188 iscsit_dec_conn_usage_count(l_conn); 2189 } 2190 2191 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2192 2193 return 0; 2194 } 2195 2196 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2197 { 2198 struct iscsi_session *sess = conn->sess; 2199 2200 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2201 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2202 2203 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2204 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2205 " while ERL!=2.\n"); 2206 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2207 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2208 return 0; 2209 } 2210 2211 if (conn->cid == cmd->logout_cid) { 2212 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2213 " with CID: %hu on CID: %hu, implementation error.\n", 2214 cmd->logout_cid, conn->cid); 2215 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2216 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2217 return 0; 2218 } 2219 2220 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2221 2222 return 0; 2223 } 2224 2225 int 2226 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2227 unsigned char *buf) 2228 { 2229 int cmdsn_ret, logout_remove = 0; 2230 u8 reason_code = 0; 2231 struct iscsi_logout *hdr; 2232 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2233 2234 hdr = (struct iscsi_logout *) buf; 2235 reason_code = (hdr->flags & 0x7f); 2236 2237 if (tiqn) { 2238 spin_lock(&tiqn->logout_stats.lock); 2239 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2240 tiqn->logout_stats.normal_logouts++; 2241 else 2242 tiqn->logout_stats.abnormal_logouts++; 2243 spin_unlock(&tiqn->logout_stats.lock); 2244 } 2245 2246 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2247 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2248 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2249 hdr->cid, conn->cid); 2250 2251 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2252 pr_err("Received logout request on connection that" 2253 " is not in logged in state, ignoring request.\n"); 2254 iscsit_free_cmd(cmd, false); 2255 return 0; 2256 } 2257 2258 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2259 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2260 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2261 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2262 cmd->targ_xfer_tag = 0xFFFFFFFF; 2263 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2264 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2265 cmd->logout_cid = be16_to_cpu(hdr->cid); 2266 cmd->logout_reason = reason_code; 2267 cmd->data_direction = DMA_NONE; 2268 2269 /* 2270 * We need to sleep in these cases (by returning 1) until the Logout 2271 * Response gets sent in the tx thread. 2272 */ 2273 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2274 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2275 be16_to_cpu(hdr->cid) == conn->cid)) 2276 logout_remove = 1; 2277 2278 spin_lock_bh(&conn->cmd_lock); 2279 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2280 spin_unlock_bh(&conn->cmd_lock); 2281 2282 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2283 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2284 2285 /* 2286 * Immediate commands are executed, well, immediately. 2287 * Non-Immediate Logout Commands are executed in CmdSN order. 2288 */ 2289 if (cmd->immediate_cmd) { 2290 int ret = iscsit_execute_cmd(cmd, 0); 2291 2292 if (ret < 0) 2293 return ret; 2294 } else { 2295 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 2296 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2297 logout_remove = 0; 2298 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2299 return iscsit_add_reject_from_cmd( 2300 ISCSI_REASON_PROTOCOL_ERROR, 2301 1, 0, buf, cmd); 2302 } 2303 } 2304 2305 return logout_remove; 2306 } 2307 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2308 2309 static int iscsit_handle_snack( 2310 struct iscsi_conn *conn, 2311 unsigned char *buf) 2312 { 2313 struct iscsi_snack *hdr; 2314 2315 hdr = (struct iscsi_snack *) buf; 2316 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2317 2318 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2319 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2320 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2321 hdr->begrun, hdr->runlength, conn->cid); 2322 2323 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2324 pr_err("Initiator sent SNACK request while in" 2325 " ErrorRecoveryLevel=0.\n"); 2326 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2327 buf, conn); 2328 } 2329 /* 2330 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2331 * call from inside iscsi_send_recovery_datain_or_r2t(). 2332 */ 2333 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2334 case 0: 2335 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2336 hdr->itt, 2337 be32_to_cpu(hdr->ttt), 2338 be32_to_cpu(hdr->begrun), 2339 be32_to_cpu(hdr->runlength)); 2340 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2341 return iscsit_handle_status_snack(conn, hdr->itt, 2342 be32_to_cpu(hdr->ttt), 2343 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2344 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2345 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2346 be32_to_cpu(hdr->begrun), 2347 be32_to_cpu(hdr->runlength)); 2348 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2349 /* FIXME: Support R-Data SNACK */ 2350 pr_err("R-Data SNACK Not Supported.\n"); 2351 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2352 buf, conn); 2353 default: 2354 pr_err("Unknown SNACK type 0x%02x, protocol" 2355 " error.\n", hdr->flags & 0x0f); 2356 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2357 buf, conn); 2358 } 2359 2360 return 0; 2361 } 2362 2363 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2364 { 2365 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2366 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2367 wait_for_completion_interruptible_timeout( 2368 &conn->rx_half_close_comp, 2369 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2370 } 2371 } 2372 2373 static int iscsit_handle_immediate_data( 2374 struct iscsi_cmd *cmd, 2375 struct iscsi_scsi_req *hdr, 2376 u32 length) 2377 { 2378 int iov_ret, rx_got = 0, rx_size = 0; 2379 u32 checksum, iov_count = 0, padding = 0; 2380 struct iscsi_conn *conn = cmd->conn; 2381 struct kvec *iov; 2382 2383 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2384 if (iov_ret < 0) 2385 return IMMEDIATE_DATA_CANNOT_RECOVER; 2386 2387 rx_size = length; 2388 iov_count = iov_ret; 2389 iov = &cmd->iov_data[0]; 2390 2391 padding = ((-length) & 3); 2392 if (padding != 0) { 2393 iov[iov_count].iov_base = cmd->pad_bytes; 2394 iov[iov_count++].iov_len = padding; 2395 rx_size += padding; 2396 } 2397 2398 if (conn->conn_ops->DataDigest) { 2399 iov[iov_count].iov_base = &checksum; 2400 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2401 rx_size += ISCSI_CRC_LEN; 2402 } 2403 2404 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2405 2406 iscsit_unmap_iovec(cmd); 2407 2408 if (rx_got != rx_size) { 2409 iscsit_rx_thread_wait_for_tcp(conn); 2410 return IMMEDIATE_DATA_CANNOT_RECOVER; 2411 } 2412 2413 if (conn->conn_ops->DataDigest) { 2414 u32 data_crc; 2415 2416 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2417 cmd->write_data_done, length, padding, 2418 cmd->pad_bytes); 2419 2420 if (checksum != data_crc) { 2421 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2422 " does not match computed 0x%08x\n", checksum, 2423 data_crc); 2424 2425 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2426 pr_err("Unable to recover from" 2427 " Immediate Data digest failure while" 2428 " in ERL=0.\n"); 2429 iscsit_add_reject_from_cmd( 2430 ISCSI_REASON_DATA_DIGEST_ERROR, 2431 1, 0, (unsigned char *)hdr, cmd); 2432 return IMMEDIATE_DATA_CANNOT_RECOVER; 2433 } else { 2434 iscsit_add_reject_from_cmd( 2435 ISCSI_REASON_DATA_DIGEST_ERROR, 2436 0, 0, (unsigned char *)hdr, cmd); 2437 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2438 } 2439 } else { 2440 pr_debug("Got CRC32C DataDigest 0x%08x for" 2441 " %u bytes of Immediate Data\n", checksum, 2442 length); 2443 } 2444 } 2445 2446 cmd->write_data_done += length; 2447 2448 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2449 spin_lock_bh(&cmd->istate_lock); 2450 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2451 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2452 spin_unlock_bh(&cmd->istate_lock); 2453 } 2454 2455 return IMMEDIATE_DATA_NORMAL_OPERATION; 2456 } 2457 2458 /* 2459 * Called with sess->conn_lock held. 2460 */ 2461 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2462 with active network interface */ 2463 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2464 { 2465 struct iscsi_cmd *cmd; 2466 struct iscsi_conn *conn_p; 2467 2468 /* 2469 * Only send a Asynchronous Message on connections whos network 2470 * interface is still functional. 2471 */ 2472 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2473 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2474 iscsit_inc_conn_usage_count(conn_p); 2475 break; 2476 } 2477 } 2478 2479 if (!conn_p) 2480 return; 2481 2482 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC); 2483 if (!cmd) { 2484 iscsit_dec_conn_usage_count(conn_p); 2485 return; 2486 } 2487 2488 cmd->logout_cid = conn->cid; 2489 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2490 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2491 2492 spin_lock_bh(&conn_p->cmd_lock); 2493 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2494 spin_unlock_bh(&conn_p->cmd_lock); 2495 2496 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2497 iscsit_dec_conn_usage_count(conn_p); 2498 } 2499 2500 static int iscsit_send_conn_drop_async_message( 2501 struct iscsi_cmd *cmd, 2502 struct iscsi_conn *conn) 2503 { 2504 struct iscsi_async *hdr; 2505 2506 cmd->tx_size = ISCSI_HDR_LEN; 2507 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2508 2509 hdr = (struct iscsi_async *) cmd->pdu; 2510 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2511 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2512 cmd->init_task_tag = RESERVED_ITT; 2513 cmd->targ_xfer_tag = 0xFFFFFFFF; 2514 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2515 cmd->stat_sn = conn->stat_sn++; 2516 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2517 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2518 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2519 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2520 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2521 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2522 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2523 2524 if (conn->conn_ops->HeaderDigest) { 2525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2526 2527 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2528 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2529 2530 cmd->tx_size += ISCSI_CRC_LEN; 2531 pr_debug("Attaching CRC32C HeaderDigest to" 2532 " Async Message 0x%08x\n", *header_digest); 2533 } 2534 2535 cmd->iov_misc[0].iov_base = cmd->pdu; 2536 cmd->iov_misc[0].iov_len = cmd->tx_size; 2537 cmd->iov_misc_count = 1; 2538 2539 pr_debug("Sending Connection Dropped Async Message StatSN:" 2540 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2541 cmd->logout_cid, conn->cid); 2542 return 0; 2543 } 2544 2545 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2546 { 2547 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2548 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2549 wait_for_completion_interruptible_timeout( 2550 &conn->tx_half_close_comp, 2551 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2552 } 2553 } 2554 2555 static void 2556 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2557 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2558 bool set_statsn) 2559 { 2560 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2561 hdr->flags = datain->flags; 2562 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2563 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2564 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2565 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2566 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2567 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2568 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2569 } 2570 } 2571 hton24(hdr->dlength, datain->length); 2572 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2573 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2574 (struct scsi_lun *)&hdr->lun); 2575 else 2576 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2577 2578 hdr->itt = cmd->init_task_tag; 2579 2580 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2581 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2582 else 2583 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2584 if (set_statsn) 2585 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2586 else 2587 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2588 2589 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2590 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2591 hdr->datasn = cpu_to_be32(datain->data_sn); 2592 hdr->offset = cpu_to_be32(datain->offset); 2593 2594 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2595 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2596 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2597 ntohl(hdr->offset), datain->length, conn->cid); 2598 } 2599 2600 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2601 { 2602 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2603 struct iscsi_datain datain; 2604 struct iscsi_datain_req *dr; 2605 struct kvec *iov; 2606 u32 iov_count = 0, tx_size = 0; 2607 int eodr = 0, ret, iov_ret; 2608 bool set_statsn = false; 2609 2610 memset(&datain, 0, sizeof(struct iscsi_datain)); 2611 dr = iscsit_get_datain_values(cmd, &datain); 2612 if (!dr) { 2613 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2614 cmd->init_task_tag); 2615 return -1; 2616 } 2617 /* 2618 * Be paranoid and double check the logic for now. 2619 */ 2620 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2621 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2622 " datain.length: %u exceeds cmd->data_length: %u\n", 2623 cmd->init_task_tag, datain.offset, datain.length, 2624 cmd->se_cmd.data_length); 2625 return -1; 2626 } 2627 2628 spin_lock_bh(&conn->sess->session_stats_lock); 2629 conn->sess->tx_data_octets += datain.length; 2630 if (conn->sess->se_sess->se_node_acl) { 2631 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 2632 conn->sess->se_sess->se_node_acl->read_bytes += datain.length; 2633 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 2634 } 2635 spin_unlock_bh(&conn->sess->session_stats_lock); 2636 /* 2637 * Special case for successfully execution w/ both DATAIN 2638 * and Sense Data. 2639 */ 2640 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2641 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2642 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2643 else { 2644 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2645 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2646 iscsit_increment_maxcmdsn(cmd, conn->sess); 2647 cmd->stat_sn = conn->stat_sn++; 2648 set_statsn = true; 2649 } else if (dr->dr_complete == 2650 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2651 set_statsn = true; 2652 } 2653 2654 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2655 2656 iov = &cmd->iov_data[0]; 2657 iov[iov_count].iov_base = cmd->pdu; 2658 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2659 tx_size += ISCSI_HDR_LEN; 2660 2661 if (conn->conn_ops->HeaderDigest) { 2662 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2663 2664 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 2665 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2666 2667 iov[0].iov_len += ISCSI_CRC_LEN; 2668 tx_size += ISCSI_CRC_LEN; 2669 2670 pr_debug("Attaching CRC32 HeaderDigest" 2671 " for DataIN PDU 0x%08x\n", *header_digest); 2672 } 2673 2674 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 2675 datain.offset, datain.length); 2676 if (iov_ret < 0) 2677 return -1; 2678 2679 iov_count += iov_ret; 2680 tx_size += datain.length; 2681 2682 cmd->padding = ((-datain.length) & 3); 2683 if (cmd->padding) { 2684 iov[iov_count].iov_base = cmd->pad_bytes; 2685 iov[iov_count++].iov_len = cmd->padding; 2686 tx_size += cmd->padding; 2687 2688 pr_debug("Attaching %u padding bytes\n", 2689 cmd->padding); 2690 } 2691 if (conn->conn_ops->DataDigest) { 2692 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2693 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2694 2695 iov[iov_count].iov_base = &cmd->data_crc; 2696 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2697 tx_size += ISCSI_CRC_LEN; 2698 2699 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2700 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2701 } 2702 2703 cmd->iov_data_count = iov_count; 2704 cmd->tx_size = tx_size; 2705 2706 /* sendpage is preferred but can't insert markers */ 2707 if (!conn->conn_ops->IFMarker) 2708 ret = iscsit_fe_sendpage_sg(cmd, conn); 2709 else 2710 ret = iscsit_send_tx_data(cmd, conn, 0); 2711 2712 iscsit_unmap_iovec(cmd); 2713 2714 if (ret < 0) { 2715 iscsit_tx_thread_wait_for_tcp(conn); 2716 return ret; 2717 } 2718 2719 if (dr->dr_complete) { 2720 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2721 2 : 1; 2722 iscsit_free_datain_req(cmd, dr); 2723 } 2724 2725 return eodr; 2726 } 2727 2728 int 2729 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2730 struct iscsi_logout_rsp *hdr) 2731 { 2732 struct iscsi_conn *logout_conn = NULL; 2733 struct iscsi_conn_recovery *cr = NULL; 2734 struct iscsi_session *sess = conn->sess; 2735 /* 2736 * The actual shutting down of Sessions and/or Connections 2737 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2738 * is done in scsi_logout_post_handler(). 2739 */ 2740 switch (cmd->logout_reason) { 2741 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2742 pr_debug("iSCSI session logout successful, setting" 2743 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2744 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2745 break; 2746 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2747 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2748 break; 2749 /* 2750 * For CLOSECONNECTION logout requests carrying 2751 * a matching logout CID -> local CID, the reference 2752 * for the local CID will have been incremented in 2753 * iscsi_logout_closeconnection(). 2754 * 2755 * For CLOSECONNECTION logout requests carrying 2756 * a different CID than the connection it arrived 2757 * on, the connection responding to cmd->logout_cid 2758 * is stopped in iscsit_logout_post_handler_diffcid(). 2759 */ 2760 2761 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2762 " successful.\n", cmd->logout_cid, conn->cid); 2763 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2764 break; 2765 case ISCSI_LOGOUT_REASON_RECOVERY: 2766 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2767 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2768 break; 2769 /* 2770 * If the connection is still active from our point of view 2771 * force connection recovery to occur. 2772 */ 2773 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2774 cmd->logout_cid); 2775 if (logout_conn) { 2776 iscsit_connection_reinstatement_rcfr(logout_conn); 2777 iscsit_dec_conn_usage_count(logout_conn); 2778 } 2779 2780 cr = iscsit_get_inactive_connection_recovery_entry( 2781 conn->sess, cmd->logout_cid); 2782 if (!cr) { 2783 pr_err("Unable to locate CID: %hu for" 2784 " REMOVECONNFORRECOVERY Logout Request.\n", 2785 cmd->logout_cid); 2786 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2787 break; 2788 } 2789 2790 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2791 2792 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2793 " for recovery for CID: %hu on CID: %hu successful.\n", 2794 cmd->logout_cid, conn->cid); 2795 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2796 break; 2797 default: 2798 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2799 cmd->logout_reason); 2800 return -1; 2801 } 2802 2803 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2804 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2805 hdr->response = cmd->logout_response; 2806 hdr->itt = cmd->init_task_tag; 2807 cmd->stat_sn = conn->stat_sn++; 2808 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2809 2810 iscsit_increment_maxcmdsn(cmd, conn->sess); 2811 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2812 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2813 2814 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2815 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2816 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2817 cmd->logout_cid, conn->cid); 2818 2819 return 0; 2820 } 2821 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2822 2823 static int 2824 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2825 { 2826 struct kvec *iov; 2827 int niov = 0, tx_size, rc; 2828 2829 rc = iscsit_build_logout_rsp(cmd, conn, 2830 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2831 if (rc < 0) 2832 return rc; 2833 2834 tx_size = ISCSI_HDR_LEN; 2835 iov = &cmd->iov_misc[0]; 2836 iov[niov].iov_base = cmd->pdu; 2837 iov[niov++].iov_len = ISCSI_HDR_LEN; 2838 2839 if (conn->conn_ops->HeaderDigest) { 2840 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2841 2842 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0], 2843 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2844 2845 iov[0].iov_len += ISCSI_CRC_LEN; 2846 tx_size += ISCSI_CRC_LEN; 2847 pr_debug("Attaching CRC32C HeaderDigest to" 2848 " Logout Response 0x%08x\n", *header_digest); 2849 } 2850 cmd->iov_misc_count = niov; 2851 cmd->tx_size = tx_size; 2852 2853 return 0; 2854 } 2855 2856 void 2857 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2858 struct iscsi_nopin *hdr, bool nopout_response) 2859 { 2860 hdr->opcode = ISCSI_OP_NOOP_IN; 2861 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2862 hton24(hdr->dlength, cmd->buf_ptr_size); 2863 if (nopout_response) 2864 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2865 hdr->itt = cmd->init_task_tag; 2866 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2867 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2868 conn->stat_sn; 2869 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2870 2871 if (nopout_response) 2872 iscsit_increment_maxcmdsn(cmd, conn->sess); 2873 2874 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2875 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2876 2877 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2878 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2879 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2880 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2881 } 2882 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2883 2884 /* 2885 * Unsolicited NOPIN, either requesting a response or not. 2886 */ 2887 static int iscsit_send_unsolicited_nopin( 2888 struct iscsi_cmd *cmd, 2889 struct iscsi_conn *conn, 2890 int want_response) 2891 { 2892 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2893 int tx_size = ISCSI_HDR_LEN, ret; 2894 2895 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 2896 2897 if (conn->conn_ops->HeaderDigest) { 2898 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2899 2900 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2901 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2902 2903 tx_size += ISCSI_CRC_LEN; 2904 pr_debug("Attaching CRC32C HeaderDigest to" 2905 " NopIN 0x%08x\n", *header_digest); 2906 } 2907 2908 cmd->iov_misc[0].iov_base = cmd->pdu; 2909 cmd->iov_misc[0].iov_len = tx_size; 2910 cmd->iov_misc_count = 1; 2911 cmd->tx_size = tx_size; 2912 2913 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2914 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2915 2916 ret = iscsit_send_tx_data(cmd, conn, 1); 2917 if (ret < 0) { 2918 iscsit_tx_thread_wait_for_tcp(conn); 2919 return ret; 2920 } 2921 2922 spin_lock_bh(&cmd->istate_lock); 2923 cmd->i_state = want_response ? 2924 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2925 spin_unlock_bh(&cmd->istate_lock); 2926 2927 return 0; 2928 } 2929 2930 static int 2931 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2932 { 2933 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2934 struct kvec *iov; 2935 u32 padding = 0; 2936 int niov = 0, tx_size; 2937 2938 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 2939 2940 tx_size = ISCSI_HDR_LEN; 2941 iov = &cmd->iov_misc[0]; 2942 iov[niov].iov_base = cmd->pdu; 2943 iov[niov++].iov_len = ISCSI_HDR_LEN; 2944 2945 if (conn->conn_ops->HeaderDigest) { 2946 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2947 2948 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 2949 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 2950 2951 iov[0].iov_len += ISCSI_CRC_LEN; 2952 tx_size += ISCSI_CRC_LEN; 2953 pr_debug("Attaching CRC32C HeaderDigest" 2954 " to NopIn 0x%08x\n", *header_digest); 2955 } 2956 2957 /* 2958 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2959 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2960 */ 2961 if (cmd->buf_ptr_size) { 2962 iov[niov].iov_base = cmd->buf_ptr; 2963 iov[niov++].iov_len = cmd->buf_ptr_size; 2964 tx_size += cmd->buf_ptr_size; 2965 2966 pr_debug("Echoing back %u bytes of ping" 2967 " data.\n", cmd->buf_ptr_size); 2968 2969 padding = ((-cmd->buf_ptr_size) & 3); 2970 if (padding != 0) { 2971 iov[niov].iov_base = &cmd->pad_bytes; 2972 iov[niov++].iov_len = padding; 2973 tx_size += padding; 2974 pr_debug("Attaching %u additional" 2975 " padding bytes.\n", padding); 2976 } 2977 if (conn->conn_ops->DataDigest) { 2978 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2979 cmd->buf_ptr, cmd->buf_ptr_size, 2980 padding, (u8 *)&cmd->pad_bytes, 2981 (u8 *)&cmd->data_crc); 2982 2983 iov[niov].iov_base = &cmd->data_crc; 2984 iov[niov++].iov_len = ISCSI_CRC_LEN; 2985 tx_size += ISCSI_CRC_LEN; 2986 pr_debug("Attached DataDigest for %u" 2987 " bytes of ping data, CRC 0x%08x\n", 2988 cmd->buf_ptr_size, cmd->data_crc); 2989 } 2990 } 2991 2992 cmd->iov_misc_count = niov; 2993 cmd->tx_size = tx_size; 2994 2995 return 0; 2996 } 2997 2998 static int iscsit_send_r2t( 2999 struct iscsi_cmd *cmd, 3000 struct iscsi_conn *conn) 3001 { 3002 int tx_size = 0; 3003 struct iscsi_r2t *r2t; 3004 struct iscsi_r2t_rsp *hdr; 3005 int ret; 3006 3007 r2t = iscsit_get_r2t_from_list(cmd); 3008 if (!r2t) 3009 return -1; 3010 3011 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3012 memset(hdr, 0, ISCSI_HDR_LEN); 3013 hdr->opcode = ISCSI_OP_R2T; 3014 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3015 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3016 (struct scsi_lun *)&hdr->lun); 3017 hdr->itt = cmd->init_task_tag; 3018 spin_lock_bh(&conn->sess->ttt_lock); 3019 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3020 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 3021 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 3022 spin_unlock_bh(&conn->sess->ttt_lock); 3023 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3024 hdr->statsn = cpu_to_be32(conn->stat_sn); 3025 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3026 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3027 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3028 hdr->data_offset = cpu_to_be32(r2t->offset); 3029 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3030 3031 cmd->iov_misc[0].iov_base = cmd->pdu; 3032 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3033 tx_size += ISCSI_HDR_LEN; 3034 3035 if (conn->conn_ops->HeaderDigest) { 3036 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3037 3038 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3039 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3040 3041 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3042 tx_size += ISCSI_CRC_LEN; 3043 pr_debug("Attaching CRC32 HeaderDigest for R2T" 3044 " PDU 0x%08x\n", *header_digest); 3045 } 3046 3047 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3048 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3049 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3050 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3051 r2t->offset, r2t->xfer_len, conn->cid); 3052 3053 cmd->iov_misc_count = 1; 3054 cmd->tx_size = tx_size; 3055 3056 spin_lock_bh(&cmd->r2t_lock); 3057 r2t->sent_r2t = 1; 3058 spin_unlock_bh(&cmd->r2t_lock); 3059 3060 ret = iscsit_send_tx_data(cmd, conn, 1); 3061 if (ret < 0) { 3062 iscsit_tx_thread_wait_for_tcp(conn); 3063 return ret; 3064 } 3065 3066 spin_lock_bh(&cmd->dataout_timeout_lock); 3067 iscsit_start_dataout_timer(cmd, conn); 3068 spin_unlock_bh(&cmd->dataout_timeout_lock); 3069 3070 return 0; 3071 } 3072 3073 /* 3074 * @recovery: If called from iscsi_task_reassign_complete_write() for 3075 * connection recovery. 3076 */ 3077 int iscsit_build_r2ts_for_cmd( 3078 struct iscsi_conn *conn, 3079 struct iscsi_cmd *cmd, 3080 bool recovery) 3081 { 3082 int first_r2t = 1; 3083 u32 offset = 0, xfer_len = 0; 3084 3085 spin_lock_bh(&cmd->r2t_lock); 3086 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3087 spin_unlock_bh(&cmd->r2t_lock); 3088 return 0; 3089 } 3090 3091 if (conn->sess->sess_ops->DataSequenceInOrder && 3092 !recovery) 3093 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3094 3095 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3096 if (conn->sess->sess_ops->DataSequenceInOrder) { 3097 offset = cmd->r2t_offset; 3098 3099 if (first_r2t && recovery) { 3100 int new_data_end = offset + 3101 conn->sess->sess_ops->MaxBurstLength - 3102 cmd->next_burst_len; 3103 3104 if (new_data_end > cmd->se_cmd.data_length) 3105 xfer_len = cmd->se_cmd.data_length - offset; 3106 else 3107 xfer_len = 3108 conn->sess->sess_ops->MaxBurstLength - 3109 cmd->next_burst_len; 3110 } else { 3111 int new_data_end = offset + 3112 conn->sess->sess_ops->MaxBurstLength; 3113 3114 if (new_data_end > cmd->se_cmd.data_length) 3115 xfer_len = cmd->se_cmd.data_length - offset; 3116 else 3117 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3118 } 3119 cmd->r2t_offset += xfer_len; 3120 3121 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3122 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3123 } else { 3124 struct iscsi_seq *seq; 3125 3126 seq = iscsit_get_seq_holder_for_r2t(cmd); 3127 if (!seq) { 3128 spin_unlock_bh(&cmd->r2t_lock); 3129 return -1; 3130 } 3131 3132 offset = seq->offset; 3133 xfer_len = seq->xfer_len; 3134 3135 if (cmd->seq_send_order == cmd->seq_count) 3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3137 } 3138 cmd->outstanding_r2ts++; 3139 first_r2t = 0; 3140 3141 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3142 spin_unlock_bh(&cmd->r2t_lock); 3143 return -1; 3144 } 3145 3146 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3147 break; 3148 } 3149 spin_unlock_bh(&cmd->r2t_lock); 3150 3151 return 0; 3152 } 3153 3154 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3155 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3156 { 3157 if (inc_stat_sn) 3158 cmd->stat_sn = conn->stat_sn++; 3159 3160 spin_lock_bh(&conn->sess->session_stats_lock); 3161 conn->sess->rsp_pdus++; 3162 spin_unlock_bh(&conn->sess->session_stats_lock); 3163 3164 memset(hdr, 0, ISCSI_HDR_LEN); 3165 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3166 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3167 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3168 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3169 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3170 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3171 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3172 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3173 } 3174 hdr->response = cmd->iscsi_response; 3175 hdr->cmd_status = cmd->se_cmd.scsi_status; 3176 hdr->itt = cmd->init_task_tag; 3177 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3178 3179 iscsit_increment_maxcmdsn(cmd, conn->sess); 3180 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3181 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3182 3183 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3184 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3185 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3186 cmd->se_cmd.scsi_status, conn->cid); 3187 } 3188 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3189 3190 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3191 { 3192 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3193 struct kvec *iov; 3194 u32 padding = 0, tx_size = 0; 3195 int iov_count = 0; 3196 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3197 3198 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3199 3200 iov = &cmd->iov_misc[0]; 3201 iov[iov_count].iov_base = cmd->pdu; 3202 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3203 tx_size += ISCSI_HDR_LEN; 3204 3205 /* 3206 * Attach SENSE DATA payload to iSCSI Response PDU 3207 */ 3208 if (cmd->se_cmd.sense_buffer && 3209 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3210 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3211 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3212 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3213 3214 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3215 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3216 iov[iov_count].iov_base = cmd->sense_buffer; 3217 iov[iov_count++].iov_len = 3218 (cmd->se_cmd.scsi_sense_length + padding); 3219 tx_size += cmd->se_cmd.scsi_sense_length; 3220 3221 if (padding) { 3222 memset(cmd->sense_buffer + 3223 cmd->se_cmd.scsi_sense_length, 0, padding); 3224 tx_size += padding; 3225 pr_debug("Adding %u bytes of padding to" 3226 " SENSE.\n", padding); 3227 } 3228 3229 if (conn->conn_ops->DataDigest) { 3230 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3231 cmd->sense_buffer, 3232 (cmd->se_cmd.scsi_sense_length + padding), 3233 0, NULL, (u8 *)&cmd->data_crc); 3234 3235 iov[iov_count].iov_base = &cmd->data_crc; 3236 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3237 tx_size += ISCSI_CRC_LEN; 3238 3239 pr_debug("Attaching CRC32 DataDigest for" 3240 " SENSE, %u bytes CRC 0x%08x\n", 3241 (cmd->se_cmd.scsi_sense_length + padding), 3242 cmd->data_crc); 3243 } 3244 3245 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3246 " Response PDU\n", 3247 cmd->se_cmd.scsi_sense_length); 3248 } 3249 3250 if (conn->conn_ops->HeaderDigest) { 3251 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3252 3253 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu, 3254 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3255 3256 iov[0].iov_len += ISCSI_CRC_LEN; 3257 tx_size += ISCSI_CRC_LEN; 3258 pr_debug("Attaching CRC32 HeaderDigest for Response" 3259 " PDU 0x%08x\n", *header_digest); 3260 } 3261 3262 cmd->iov_misc_count = iov_count; 3263 cmd->tx_size = tx_size; 3264 3265 return 0; 3266 } 3267 3268 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3269 { 3270 switch (se_tmr->response) { 3271 case TMR_FUNCTION_COMPLETE: 3272 return ISCSI_TMF_RSP_COMPLETE; 3273 case TMR_TASK_DOES_NOT_EXIST: 3274 return ISCSI_TMF_RSP_NO_TASK; 3275 case TMR_LUN_DOES_NOT_EXIST: 3276 return ISCSI_TMF_RSP_NO_LUN; 3277 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3278 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3279 case TMR_FUNCTION_AUTHORIZATION_FAILED: 3280 return ISCSI_TMF_RSP_AUTH_FAILED; 3281 case TMR_FUNCTION_REJECTED: 3282 default: 3283 return ISCSI_TMF_RSP_REJECTED; 3284 } 3285 } 3286 3287 void 3288 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3289 struct iscsi_tm_rsp *hdr) 3290 { 3291 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3292 3293 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3294 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3295 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3296 hdr->itt = cmd->init_task_tag; 3297 cmd->stat_sn = conn->stat_sn++; 3298 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3299 3300 iscsit_increment_maxcmdsn(cmd, conn->sess); 3301 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3302 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3303 3304 pr_debug("Built Task Management Response ITT: 0x%08x," 3305 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3306 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3307 } 3308 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3309 3310 static int 3311 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3312 { 3313 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3314 u32 tx_size = 0; 3315 3316 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3317 3318 cmd->iov_misc[0].iov_base = cmd->pdu; 3319 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3320 tx_size += ISCSI_HDR_LEN; 3321 3322 if (conn->conn_ops->HeaderDigest) { 3323 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3324 3325 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3326 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3327 3328 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3329 tx_size += ISCSI_CRC_LEN; 3330 pr_debug("Attaching CRC32 HeaderDigest for Task" 3331 " Mgmt Response PDU 0x%08x\n", *header_digest); 3332 } 3333 3334 cmd->iov_misc_count = 1; 3335 cmd->tx_size = tx_size; 3336 3337 return 0; 3338 } 3339 3340 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3341 { 3342 bool ret = false; 3343 3344 if (np->np_sockaddr.ss_family == AF_INET6) { 3345 const struct sockaddr_in6 sin6 = { 3346 .sin6_addr = IN6ADDR_ANY_INIT }; 3347 struct sockaddr_in6 *sock_in6 = 3348 (struct sockaddr_in6 *)&np->np_sockaddr; 3349 3350 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3351 sin6.sin6_addr.s6_addr, 16)) 3352 ret = true; 3353 } else { 3354 struct sockaddr_in * sock_in = 3355 (struct sockaddr_in *)&np->np_sockaddr; 3356 3357 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3358 ret = true; 3359 } 3360 3361 return ret; 3362 } 3363 3364 #define SENDTARGETS_BUF_LIMIT 32768U 3365 3366 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) 3367 { 3368 char *payload = NULL; 3369 struct iscsi_conn *conn = cmd->conn; 3370 struct iscsi_portal_group *tpg; 3371 struct iscsi_tiqn *tiqn; 3372 struct iscsi_tpg_np *tpg_np; 3373 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3374 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3375 3376 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3377 SENDTARGETS_BUF_LIMIT); 3378 3379 payload = kzalloc(buffer_len, GFP_KERNEL); 3380 if (!payload) { 3381 pr_err("Unable to allocate memory for sendtargets" 3382 " response.\n"); 3383 return -ENOMEM; 3384 } 3385 3386 spin_lock(&tiqn_lock); 3387 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3388 len = sprintf(buf, "TargetName=%s", tiqn->tiqn); 3389 len += 1; 3390 3391 if ((len + payload_len) > buffer_len) { 3392 end_of_buf = 1; 3393 goto eob; 3394 } 3395 memcpy(payload + payload_len, buf, len); 3396 payload_len += len; 3397 3398 spin_lock(&tiqn->tiqn_tpg_lock); 3399 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3400 3401 spin_lock(&tpg->tpg_state_lock); 3402 if ((tpg->tpg_state == TPG_STATE_FREE) || 3403 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3404 spin_unlock(&tpg->tpg_state_lock); 3405 continue; 3406 } 3407 spin_unlock(&tpg->tpg_state_lock); 3408 3409 spin_lock(&tpg->tpg_np_lock); 3410 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3411 tpg_np_list) { 3412 struct iscsi_np *np = tpg_np->tpg_np; 3413 bool inaddr_any = iscsit_check_inaddr_any(np); 3414 3415 len = sprintf(buf, "TargetAddress=" 3416 "%s%s%s:%hu,%hu", 3417 (np->np_sockaddr.ss_family == AF_INET6) ? 3418 "[" : "", (inaddr_any == false) ? 3419 np->np_ip : conn->local_ip, 3420 (np->np_sockaddr.ss_family == AF_INET6) ? 3421 "]" : "", (inaddr_any == false) ? 3422 np->np_port : conn->local_port, 3423 tpg->tpgt); 3424 len += 1; 3425 3426 if ((len + payload_len) > buffer_len) { 3427 spin_unlock(&tpg->tpg_np_lock); 3428 spin_unlock(&tiqn->tiqn_tpg_lock); 3429 end_of_buf = 1; 3430 goto eob; 3431 } 3432 memcpy(payload + payload_len, buf, len); 3433 payload_len += len; 3434 } 3435 spin_unlock(&tpg->tpg_np_lock); 3436 } 3437 spin_unlock(&tiqn->tiqn_tpg_lock); 3438 eob: 3439 if (end_of_buf) 3440 break; 3441 } 3442 spin_unlock(&tiqn_lock); 3443 3444 cmd->buf_ptr = payload; 3445 3446 return payload_len; 3447 } 3448 3449 /* 3450 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3451 * MaxRecvDataSegmentLength. 3452 */ 3453 static int iscsit_send_text_rsp( 3454 struct iscsi_cmd *cmd, 3455 struct iscsi_conn *conn) 3456 { 3457 struct iscsi_text_rsp *hdr; 3458 struct kvec *iov; 3459 u32 padding = 0, tx_size = 0; 3460 int text_length, iov_count = 0; 3461 3462 text_length = iscsit_build_sendtargets_response(cmd); 3463 if (text_length < 0) 3464 return text_length; 3465 3466 padding = ((-text_length) & 3); 3467 if (padding != 0) { 3468 memset(cmd->buf_ptr + text_length, 0, padding); 3469 pr_debug("Attaching %u additional bytes for" 3470 " padding.\n", padding); 3471 } 3472 3473 hdr = (struct iscsi_text_rsp *) cmd->pdu; 3474 memset(hdr, 0, ISCSI_HDR_LEN); 3475 hdr->opcode = ISCSI_OP_TEXT_RSP; 3476 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3477 hton24(hdr->dlength, text_length); 3478 hdr->itt = cmd->init_task_tag; 3479 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3480 cmd->stat_sn = conn->stat_sn++; 3481 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3482 3483 iscsit_increment_maxcmdsn(cmd, conn->sess); 3484 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3485 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3486 3487 iov = &cmd->iov_misc[0]; 3488 3489 iov[iov_count].iov_base = cmd->pdu; 3490 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3491 iov[iov_count].iov_base = cmd->buf_ptr; 3492 iov[iov_count++].iov_len = text_length + padding; 3493 3494 tx_size += (ISCSI_HDR_LEN + text_length + padding); 3495 3496 if (conn->conn_ops->HeaderDigest) { 3497 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3498 3499 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3500 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3501 3502 iov[0].iov_len += ISCSI_CRC_LEN; 3503 tx_size += ISCSI_CRC_LEN; 3504 pr_debug("Attaching CRC32 HeaderDigest for" 3505 " Text Response PDU 0x%08x\n", *header_digest); 3506 } 3507 3508 if (conn->conn_ops->DataDigest) { 3509 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3510 cmd->buf_ptr, (text_length + padding), 3511 0, NULL, (u8 *)&cmd->data_crc); 3512 3513 iov[iov_count].iov_base = &cmd->data_crc; 3514 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3515 tx_size += ISCSI_CRC_LEN; 3516 3517 pr_debug("Attaching DataDigest for %u bytes of text" 3518 " data, CRC 0x%08x\n", (text_length + padding), 3519 cmd->data_crc); 3520 } 3521 3522 cmd->iov_misc_count = iov_count; 3523 cmd->tx_size = tx_size; 3524 3525 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3526 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3527 text_length, conn->cid); 3528 return 0; 3529 } 3530 3531 void 3532 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3533 struct iscsi_reject *hdr) 3534 { 3535 hdr->opcode = ISCSI_OP_REJECT; 3536 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3537 hton24(hdr->dlength, ISCSI_HDR_LEN); 3538 hdr->ffffffff = cpu_to_be32(0xffffffff); 3539 cmd->stat_sn = conn->stat_sn++; 3540 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3541 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3542 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3543 3544 } 3545 EXPORT_SYMBOL(iscsit_build_reject); 3546 3547 static int iscsit_send_reject( 3548 struct iscsi_cmd *cmd, 3549 struct iscsi_conn *conn) 3550 { 3551 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3552 struct kvec *iov; 3553 u32 iov_count = 0, tx_size; 3554 3555 iscsit_build_reject(cmd, conn, hdr); 3556 3557 iov = &cmd->iov_misc[0]; 3558 iov[iov_count].iov_base = cmd->pdu; 3559 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3560 iov[iov_count].iov_base = cmd->buf_ptr; 3561 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3562 3563 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3564 3565 if (conn->conn_ops->HeaderDigest) { 3566 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3567 3568 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr, 3569 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest); 3570 3571 iov[0].iov_len += ISCSI_CRC_LEN; 3572 tx_size += ISCSI_CRC_LEN; 3573 pr_debug("Attaching CRC32 HeaderDigest for" 3574 " REJECT PDU 0x%08x\n", *header_digest); 3575 } 3576 3577 if (conn->conn_ops->DataDigest) { 3578 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr, 3579 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc); 3580 3581 iov[iov_count].iov_base = &cmd->data_crc; 3582 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3583 tx_size += ISCSI_CRC_LEN; 3584 pr_debug("Attaching CRC32 DataDigest for REJECT" 3585 " PDU 0x%08x\n", cmd->data_crc); 3586 } 3587 3588 cmd->iov_misc_count = iov_count; 3589 cmd->tx_size = tx_size; 3590 3591 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3592 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3593 3594 return 0; 3595 } 3596 3597 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3598 { 3599 struct iscsi_thread_set *ts = conn->thread_set; 3600 int ord, cpu; 3601 /* 3602 * thread_id is assigned from iscsit_global->ts_bitmap from 3603 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3604 * 3605 * Here we use thread_id to determine which CPU that this 3606 * iSCSI connection's iscsi_thread_set will be scheduled to 3607 * execute upon. 3608 */ 3609 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3610 for_each_online_cpu(cpu) { 3611 if (ord-- == 0) { 3612 cpumask_set_cpu(cpu, conn->conn_cpumask); 3613 return; 3614 } 3615 } 3616 /* 3617 * This should never be reached.. 3618 */ 3619 dump_stack(); 3620 cpumask_setall(conn->conn_cpumask); 3621 } 3622 3623 static inline void iscsit_thread_check_cpumask( 3624 struct iscsi_conn *conn, 3625 struct task_struct *p, 3626 int mode) 3627 { 3628 char buf[128]; 3629 /* 3630 * mode == 1 signals iscsi_target_tx_thread() usage. 3631 * mode == 0 signals iscsi_target_rx_thread() usage. 3632 */ 3633 if (mode == 1) { 3634 if (!conn->conn_tx_reset_cpumask) 3635 return; 3636 conn->conn_tx_reset_cpumask = 0; 3637 } else { 3638 if (!conn->conn_rx_reset_cpumask) 3639 return; 3640 conn->conn_rx_reset_cpumask = 0; 3641 } 3642 /* 3643 * Update the CPU mask for this single kthread so that 3644 * both TX and RX kthreads are scheduled to run on the 3645 * same CPU. 3646 */ 3647 memset(buf, 0, 128); 3648 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3649 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3650 } 3651 3652 static int 3653 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3654 { 3655 int ret; 3656 3657 switch (state) { 3658 case ISTATE_SEND_R2T: 3659 ret = iscsit_send_r2t(cmd, conn); 3660 if (ret < 0) 3661 goto err; 3662 break; 3663 case ISTATE_REMOVE: 3664 spin_lock_bh(&conn->cmd_lock); 3665 list_del(&cmd->i_conn_node); 3666 spin_unlock_bh(&conn->cmd_lock); 3667 3668 iscsit_free_cmd(cmd, false); 3669 break; 3670 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3671 iscsit_mod_nopin_response_timer(conn); 3672 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3673 if (ret < 0) 3674 goto err; 3675 break; 3676 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3677 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3678 if (ret < 0) 3679 goto err; 3680 break; 3681 default: 3682 pr_err("Unknown Opcode: 0x%02x ITT:" 3683 " 0x%08x, i_state: %d on CID: %hu\n", 3684 cmd->iscsi_opcode, cmd->init_task_tag, state, 3685 conn->cid); 3686 goto err; 3687 } 3688 3689 return 0; 3690 3691 err: 3692 return -1; 3693 } 3694 3695 static int 3696 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3697 { 3698 struct iscsit_transport *t = conn->conn_transport; 3699 struct iscsi_queue_req *qr; 3700 struct iscsi_cmd *cmd; 3701 u8 state; 3702 int ret; 3703 3704 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3705 atomic_set(&conn->check_immediate_queue, 0); 3706 cmd = qr->cmd; 3707 state = qr->state; 3708 kmem_cache_free(lio_qr_cache, qr); 3709 3710 ret = t->iscsit_immediate_queue(conn, cmd, state); 3711 if (ret < 0) 3712 return ret; 3713 } 3714 3715 return 0; 3716 } 3717 3718 static int 3719 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3720 { 3721 int ret; 3722 3723 check_rsp_state: 3724 switch (state) { 3725 case ISTATE_SEND_DATAIN: 3726 ret = iscsit_send_datain(cmd, conn); 3727 if (ret < 0) 3728 goto err; 3729 else if (!ret) 3730 /* more drs */ 3731 goto check_rsp_state; 3732 else if (ret == 1) { 3733 /* all done */ 3734 spin_lock_bh(&cmd->istate_lock); 3735 cmd->i_state = ISTATE_SENT_STATUS; 3736 spin_unlock_bh(&cmd->istate_lock); 3737 3738 if (atomic_read(&conn->check_immediate_queue)) 3739 return 1; 3740 3741 return 0; 3742 } else if (ret == 2) { 3743 /* Still must send status, 3744 SCF_TRANSPORT_TASK_SENSE was set */ 3745 spin_lock_bh(&cmd->istate_lock); 3746 cmd->i_state = ISTATE_SEND_STATUS; 3747 spin_unlock_bh(&cmd->istate_lock); 3748 state = ISTATE_SEND_STATUS; 3749 goto check_rsp_state; 3750 } 3751 3752 break; 3753 case ISTATE_SEND_STATUS: 3754 case ISTATE_SEND_STATUS_RECOVERY: 3755 ret = iscsit_send_response(cmd, conn); 3756 break; 3757 case ISTATE_SEND_LOGOUTRSP: 3758 ret = iscsit_send_logout(cmd, conn); 3759 break; 3760 case ISTATE_SEND_ASYNCMSG: 3761 ret = iscsit_send_conn_drop_async_message( 3762 cmd, conn); 3763 break; 3764 case ISTATE_SEND_NOPIN: 3765 ret = iscsit_send_nopin(cmd, conn); 3766 break; 3767 case ISTATE_SEND_REJECT: 3768 ret = iscsit_send_reject(cmd, conn); 3769 break; 3770 case ISTATE_SEND_TASKMGTRSP: 3771 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3772 if (ret != 0) 3773 break; 3774 ret = iscsit_tmr_post_handler(cmd, conn); 3775 if (ret != 0) 3776 iscsit_fall_back_to_erl0(conn->sess); 3777 break; 3778 case ISTATE_SEND_TEXTRSP: 3779 ret = iscsit_send_text_rsp(cmd, conn); 3780 break; 3781 default: 3782 pr_err("Unknown Opcode: 0x%02x ITT:" 3783 " 0x%08x, i_state: %d on CID: %hu\n", 3784 cmd->iscsi_opcode, cmd->init_task_tag, 3785 state, conn->cid); 3786 goto err; 3787 } 3788 if (ret < 0) 3789 goto err; 3790 3791 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3792 iscsit_tx_thread_wait_for_tcp(conn); 3793 iscsit_unmap_iovec(cmd); 3794 goto err; 3795 } 3796 iscsit_unmap_iovec(cmd); 3797 3798 switch (state) { 3799 case ISTATE_SEND_LOGOUTRSP: 3800 if (!iscsit_logout_post_handler(cmd, conn)) 3801 goto restart; 3802 /* fall through */ 3803 case ISTATE_SEND_STATUS: 3804 case ISTATE_SEND_ASYNCMSG: 3805 case ISTATE_SEND_NOPIN: 3806 case ISTATE_SEND_STATUS_RECOVERY: 3807 case ISTATE_SEND_TEXTRSP: 3808 case ISTATE_SEND_TASKMGTRSP: 3809 spin_lock_bh(&cmd->istate_lock); 3810 cmd->i_state = ISTATE_SENT_STATUS; 3811 spin_unlock_bh(&cmd->istate_lock); 3812 break; 3813 case ISTATE_SEND_REJECT: 3814 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) { 3815 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN; 3816 complete(&cmd->reject_comp); 3817 goto err; 3818 } 3819 complete(&cmd->reject_comp); 3820 break; 3821 default: 3822 pr_err("Unknown Opcode: 0x%02x ITT:" 3823 " 0x%08x, i_state: %d on CID: %hu\n", 3824 cmd->iscsi_opcode, cmd->init_task_tag, 3825 cmd->i_state, conn->cid); 3826 goto err; 3827 } 3828 3829 if (atomic_read(&conn->check_immediate_queue)) 3830 return 1; 3831 3832 return 0; 3833 3834 err: 3835 return -1; 3836 restart: 3837 return -EAGAIN; 3838 } 3839 3840 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3841 { 3842 struct iscsit_transport *t = conn->conn_transport; 3843 struct iscsi_queue_req *qr; 3844 struct iscsi_cmd *cmd; 3845 u8 state; 3846 int ret; 3847 3848 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3849 cmd = qr->cmd; 3850 state = qr->state; 3851 kmem_cache_free(lio_qr_cache, qr); 3852 3853 ret = t->iscsit_response_queue(conn, cmd, state); 3854 if (ret == 1 || ret < 0) 3855 return ret; 3856 } 3857 3858 return 0; 3859 } 3860 3861 int iscsi_target_tx_thread(void *arg) 3862 { 3863 int ret = 0; 3864 struct iscsi_conn *conn; 3865 struct iscsi_thread_set *ts = arg; 3866 /* 3867 * Allow ourselves to be interrupted by SIGINT so that a 3868 * connection recovery / failure event can be triggered externally. 3869 */ 3870 allow_signal(SIGINT); 3871 3872 restart: 3873 conn = iscsi_tx_thread_pre_handler(ts); 3874 if (!conn) 3875 goto out; 3876 3877 ret = 0; 3878 3879 while (!kthread_should_stop()) { 3880 /* 3881 * Ensure that both TX and RX per connection kthreads 3882 * are scheduled to run on the same CPU. 3883 */ 3884 iscsit_thread_check_cpumask(conn, current, 1); 3885 3886 wait_event_interruptible(conn->queues_wq, 3887 !iscsit_conn_all_queues_empty(conn) || 3888 ts->status == ISCSI_THREAD_SET_RESET); 3889 3890 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3891 signal_pending(current)) 3892 goto transport_err; 3893 3894 get_immediate: 3895 ret = iscsit_handle_immediate_queue(conn); 3896 if (ret < 0) 3897 goto transport_err; 3898 3899 ret = iscsit_handle_response_queue(conn); 3900 if (ret == 1) 3901 goto get_immediate; 3902 else if (ret == -EAGAIN) 3903 goto restart; 3904 else if (ret < 0) 3905 goto transport_err; 3906 } 3907 3908 transport_err: 3909 iscsit_take_action_for_connection_exit(conn); 3910 goto restart; 3911 out: 3912 return 0; 3913 } 3914 3915 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3916 { 3917 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3918 struct iscsi_cmd *cmd; 3919 int ret = 0; 3920 3921 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3922 case ISCSI_OP_SCSI_CMD: 3923 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3924 if (!cmd) 3925 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 3926 1, buf, conn); 3927 3928 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3929 break; 3930 case ISCSI_OP_SCSI_DATA_OUT: 3931 ret = iscsit_handle_data_out(conn, buf); 3932 break; 3933 case ISCSI_OP_NOOP_OUT: 3934 cmd = NULL; 3935 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3936 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3937 if (!cmd) 3938 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 3939 1, buf, conn); 3940 } 3941 ret = iscsit_handle_nop_out(conn, cmd, buf); 3942 break; 3943 case ISCSI_OP_SCSI_TMFUNC: 3944 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3945 if (!cmd) 3946 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 3947 1, buf, conn); 3948 3949 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3950 break; 3951 case ISCSI_OP_TEXT: 3952 ret = iscsit_handle_text_cmd(conn, buf); 3953 break; 3954 case ISCSI_OP_LOGOUT: 3955 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 3956 if (!cmd) 3957 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 3958 1, buf, conn); 3959 3960 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3961 if (ret > 0) 3962 wait_for_completion_timeout(&conn->conn_logout_comp, 3963 SECONDS_FOR_LOGOUT_COMP * HZ); 3964 break; 3965 case ISCSI_OP_SNACK: 3966 ret = iscsit_handle_snack(conn, buf); 3967 break; 3968 default: 3969 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3970 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3971 pr_err("Cannot recover from unknown" 3972 " opcode while ERL=0, closing iSCSI connection.\n"); 3973 return -1; 3974 } 3975 if (!conn->conn_ops->OFMarker) { 3976 pr_err("Unable to recover from unknown" 3977 " opcode while OFMarker=No, closing iSCSI" 3978 " connection.\n"); 3979 return -1; 3980 } 3981 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 3982 pr_err("Unable to recover from unknown" 3983 " opcode, closing iSCSI connection.\n"); 3984 return -1; 3985 } 3986 break; 3987 } 3988 3989 return ret; 3990 } 3991 3992 int iscsi_target_rx_thread(void *arg) 3993 { 3994 int ret; 3995 u8 buffer[ISCSI_HDR_LEN], opcode; 3996 u32 checksum = 0, digest = 0; 3997 struct iscsi_conn *conn = NULL; 3998 struct iscsi_thread_set *ts = arg; 3999 struct kvec iov; 4000 /* 4001 * Allow ourselves to be interrupted by SIGINT so that a 4002 * connection recovery / failure event can be triggered externally. 4003 */ 4004 allow_signal(SIGINT); 4005 4006 restart: 4007 conn = iscsi_rx_thread_pre_handler(ts); 4008 if (!conn) 4009 goto out; 4010 4011 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) { 4012 struct completion comp; 4013 int rc; 4014 4015 init_completion(&comp); 4016 rc = wait_for_completion_interruptible(&comp); 4017 if (rc < 0) 4018 goto transport_err; 4019 4020 goto out; 4021 } 4022 4023 while (!kthread_should_stop()) { 4024 /* 4025 * Ensure that both TX and RX per connection kthreads 4026 * are scheduled to run on the same CPU. 4027 */ 4028 iscsit_thread_check_cpumask(conn, current, 0); 4029 4030 memset(buffer, 0, ISCSI_HDR_LEN); 4031 memset(&iov, 0, sizeof(struct kvec)); 4032 4033 iov.iov_base = buffer; 4034 iov.iov_len = ISCSI_HDR_LEN; 4035 4036 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4037 if (ret != ISCSI_HDR_LEN) { 4038 iscsit_rx_thread_wait_for_tcp(conn); 4039 goto transport_err; 4040 } 4041 4042 /* 4043 * Set conn->bad_hdr for use with REJECT PDUs. 4044 */ 4045 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN); 4046 4047 if (conn->conn_ops->HeaderDigest) { 4048 iov.iov_base = &digest; 4049 iov.iov_len = ISCSI_CRC_LEN; 4050 4051 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4052 if (ret != ISCSI_CRC_LEN) { 4053 iscsit_rx_thread_wait_for_tcp(conn); 4054 goto transport_err; 4055 } 4056 4057 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 4058 buffer, ISCSI_HDR_LEN, 4059 0, NULL, (u8 *)&checksum); 4060 4061 if (digest != checksum) { 4062 pr_err("HeaderDigest CRC32C failed," 4063 " received 0x%08x, computed 0x%08x\n", 4064 digest, checksum); 4065 /* 4066 * Set the PDU to 0xff so it will intentionally 4067 * hit default in the switch below. 4068 */ 4069 memset(buffer, 0xff, ISCSI_HDR_LEN); 4070 spin_lock_bh(&conn->sess->session_stats_lock); 4071 conn->sess->conn_digest_errors++; 4072 spin_unlock_bh(&conn->sess->session_stats_lock); 4073 } else { 4074 pr_debug("Got HeaderDigest CRC32C" 4075 " 0x%08x\n", checksum); 4076 } 4077 } 4078 4079 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4080 goto transport_err; 4081 4082 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4083 4084 if (conn->sess->sess_ops->SessionType && 4085 ((!(opcode & ISCSI_OP_TEXT)) || 4086 (!(opcode & ISCSI_OP_LOGOUT)))) { 4087 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4088 " while in Discovery Session, rejecting.\n", opcode); 4089 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 4090 buffer, conn); 4091 goto transport_err; 4092 } 4093 4094 ret = iscsi_target_rx_opcode(conn, buffer); 4095 if (ret < 0) 4096 goto transport_err; 4097 } 4098 4099 transport_err: 4100 if (!signal_pending(current)) 4101 atomic_set(&conn->transport_failed, 1); 4102 iscsit_take_action_for_connection_exit(conn); 4103 goto restart; 4104 out: 4105 return 0; 4106 } 4107 4108 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4109 { 4110 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4111 struct iscsi_session *sess = conn->sess; 4112 /* 4113 * We expect this function to only ever be called from either RX or TX 4114 * thread context via iscsit_close_connection() once the other context 4115 * has been reset -> returned sleeping pre-handler state. 4116 */ 4117 spin_lock_bh(&conn->cmd_lock); 4118 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 4119 4120 list_del(&cmd->i_conn_node); 4121 spin_unlock_bh(&conn->cmd_lock); 4122 4123 iscsit_increment_maxcmdsn(cmd, sess); 4124 4125 iscsit_free_cmd(cmd, true); 4126 4127 spin_lock_bh(&conn->cmd_lock); 4128 } 4129 spin_unlock_bh(&conn->cmd_lock); 4130 } 4131 4132 static void iscsit_stop_timers_for_cmds( 4133 struct iscsi_conn *conn) 4134 { 4135 struct iscsi_cmd *cmd; 4136 4137 spin_lock_bh(&conn->cmd_lock); 4138 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4139 if (cmd->data_direction == DMA_TO_DEVICE) 4140 iscsit_stop_dataout_timer(cmd); 4141 } 4142 spin_unlock_bh(&conn->cmd_lock); 4143 } 4144 4145 int iscsit_close_connection( 4146 struct iscsi_conn *conn) 4147 { 4148 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4149 struct iscsi_session *sess = conn->sess; 4150 4151 pr_debug("Closing iSCSI connection CID %hu on SID:" 4152 " %u\n", conn->cid, sess->sid); 4153 /* 4154 * Always up conn_logout_comp just in case the RX Thread is sleeping 4155 * and the logout response never got sent because the connection 4156 * failed. 4157 */ 4158 complete(&conn->conn_logout_comp); 4159 4160 iscsi_release_thread_set(conn); 4161 4162 iscsit_stop_timers_for_cmds(conn); 4163 iscsit_stop_nopin_response_timer(conn); 4164 iscsit_stop_nopin_timer(conn); 4165 iscsit_free_queue_reqs_for_conn(conn); 4166 4167 /* 4168 * During Connection recovery drop unacknowledged out of order 4169 * commands for this connection, and prepare the other commands 4170 * for realligence. 4171 * 4172 * During normal operation clear the out of order commands (but 4173 * do not free the struct iscsi_ooo_cmdsn's) and release all 4174 * struct iscsi_cmds. 4175 */ 4176 if (atomic_read(&conn->connection_recovery)) { 4177 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4178 iscsit_prepare_cmds_for_realligance(conn); 4179 } else { 4180 iscsit_clear_ooo_cmdsns_for_conn(conn); 4181 iscsit_release_commands_from_conn(conn); 4182 } 4183 4184 /* 4185 * Handle decrementing session or connection usage count if 4186 * a logout response was not able to be sent because the 4187 * connection failed. Fall back to Session Recovery here. 4188 */ 4189 if (atomic_read(&conn->conn_logout_remove)) { 4190 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4191 iscsit_dec_conn_usage_count(conn); 4192 iscsit_dec_session_usage_count(sess); 4193 } 4194 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4195 iscsit_dec_conn_usage_count(conn); 4196 4197 atomic_set(&conn->conn_logout_remove, 0); 4198 atomic_set(&sess->session_reinstatement, 0); 4199 atomic_set(&sess->session_fall_back_to_erl0, 1); 4200 } 4201 4202 spin_lock_bh(&sess->conn_lock); 4203 list_del(&conn->conn_list); 4204 4205 /* 4206 * Attempt to let the Initiator know this connection failed by 4207 * sending an Connection Dropped Async Message on another 4208 * active connection. 4209 */ 4210 if (atomic_read(&conn->connection_recovery)) 4211 iscsit_build_conn_drop_async_message(conn); 4212 4213 spin_unlock_bh(&sess->conn_lock); 4214 4215 /* 4216 * If connection reinstatement is being performed on this connection, 4217 * up the connection reinstatement semaphore that is being blocked on 4218 * in iscsit_cause_connection_reinstatement(). 4219 */ 4220 spin_lock_bh(&conn->state_lock); 4221 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4222 spin_unlock_bh(&conn->state_lock); 4223 complete(&conn->conn_wait_comp); 4224 wait_for_completion(&conn->conn_post_wait_comp); 4225 spin_lock_bh(&conn->state_lock); 4226 } 4227 4228 /* 4229 * If connection reinstatement is being performed on this connection 4230 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4231 * connection wait rcfr semaphore that is being blocked on 4232 * an iscsit_connection_reinstatement_rcfr(). 4233 */ 4234 if (atomic_read(&conn->connection_wait_rcfr)) { 4235 spin_unlock_bh(&conn->state_lock); 4236 complete(&conn->conn_wait_rcfr_comp); 4237 wait_for_completion(&conn->conn_post_wait_comp); 4238 spin_lock_bh(&conn->state_lock); 4239 } 4240 atomic_set(&conn->connection_reinstatement, 1); 4241 spin_unlock_bh(&conn->state_lock); 4242 4243 /* 4244 * If any other processes are accessing this connection pointer we 4245 * must wait until they have completed. 4246 */ 4247 iscsit_check_conn_usage_count(conn); 4248 4249 if (conn->conn_rx_hash.tfm) 4250 crypto_free_hash(conn->conn_rx_hash.tfm); 4251 if (conn->conn_tx_hash.tfm) 4252 crypto_free_hash(conn->conn_tx_hash.tfm); 4253 4254 if (conn->conn_cpumask) 4255 free_cpumask_var(conn->conn_cpumask); 4256 4257 kfree(conn->conn_ops); 4258 conn->conn_ops = NULL; 4259 4260 if (conn->sock) 4261 sock_release(conn->sock); 4262 4263 if (conn->conn_transport->iscsit_free_conn) 4264 conn->conn_transport->iscsit_free_conn(conn); 4265 4266 iscsit_put_transport(conn->conn_transport); 4267 4268 conn->thread_set = NULL; 4269 4270 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4271 conn->conn_state = TARG_CONN_STATE_FREE; 4272 kfree(conn); 4273 4274 spin_lock_bh(&sess->conn_lock); 4275 atomic_dec(&sess->nconn); 4276 pr_debug("Decremented iSCSI connection count to %hu from node:" 4277 " %s\n", atomic_read(&sess->nconn), 4278 sess->sess_ops->InitiatorName); 4279 /* 4280 * Make sure that if one connection fails in an non ERL=2 iSCSI 4281 * Session that they all fail. 4282 */ 4283 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4284 !atomic_read(&sess->session_logout)) 4285 atomic_set(&sess->session_fall_back_to_erl0, 1); 4286 4287 /* 4288 * If this was not the last connection in the session, and we are 4289 * performing session reinstatement or falling back to ERL=0, call 4290 * iscsit_stop_session() without sleeping to shutdown the other 4291 * active connections. 4292 */ 4293 if (atomic_read(&sess->nconn)) { 4294 if (!atomic_read(&sess->session_reinstatement) && 4295 !atomic_read(&sess->session_fall_back_to_erl0)) { 4296 spin_unlock_bh(&sess->conn_lock); 4297 return 0; 4298 } 4299 if (!atomic_read(&sess->session_stop_active)) { 4300 atomic_set(&sess->session_stop_active, 1); 4301 spin_unlock_bh(&sess->conn_lock); 4302 iscsit_stop_session(sess, 0, 0); 4303 return 0; 4304 } 4305 spin_unlock_bh(&sess->conn_lock); 4306 return 0; 4307 } 4308 4309 /* 4310 * If this was the last connection in the session and one of the 4311 * following is occurring: 4312 * 4313 * Session Reinstatement is not being performed, and are falling back 4314 * to ERL=0 call iscsit_close_session(). 4315 * 4316 * Session Logout was requested. iscsit_close_session() will be called 4317 * elsewhere. 4318 * 4319 * Session Continuation is not being performed, start the Time2Retain 4320 * handler and check if sleep_on_sess_wait_sem is active. 4321 */ 4322 if (!atomic_read(&sess->session_reinstatement) && 4323 atomic_read(&sess->session_fall_back_to_erl0)) { 4324 spin_unlock_bh(&sess->conn_lock); 4325 target_put_session(sess->se_sess); 4326 4327 return 0; 4328 } else if (atomic_read(&sess->session_logout)) { 4329 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4330 sess->session_state = TARG_SESS_STATE_FREE; 4331 spin_unlock_bh(&sess->conn_lock); 4332 4333 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4334 complete(&sess->session_wait_comp); 4335 4336 return 0; 4337 } else { 4338 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4339 sess->session_state = TARG_SESS_STATE_FAILED; 4340 4341 if (!atomic_read(&sess->session_continuation)) { 4342 spin_unlock_bh(&sess->conn_lock); 4343 iscsit_start_time2retain_handler(sess); 4344 } else 4345 spin_unlock_bh(&sess->conn_lock); 4346 4347 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4348 complete(&sess->session_wait_comp); 4349 4350 return 0; 4351 } 4352 spin_unlock_bh(&sess->conn_lock); 4353 4354 return 0; 4355 } 4356 4357 int iscsit_close_session(struct iscsi_session *sess) 4358 { 4359 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); 4360 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4361 4362 if (atomic_read(&sess->nconn)) { 4363 pr_err("%d connection(s) still exist for iSCSI session" 4364 " to %s\n", atomic_read(&sess->nconn), 4365 sess->sess_ops->InitiatorName); 4366 BUG(); 4367 } 4368 4369 spin_lock_bh(&se_tpg->session_lock); 4370 atomic_set(&sess->session_logout, 1); 4371 atomic_set(&sess->session_reinstatement, 1); 4372 iscsit_stop_time2retain_timer(sess); 4373 spin_unlock_bh(&se_tpg->session_lock); 4374 4375 /* 4376 * transport_deregister_session_configfs() will clear the 4377 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4378 * can be setting it again with __transport_register_session() in 4379 * iscsi_post_login_handler() again after the iscsit_stop_session() 4380 * completes in iscsi_np context. 4381 */ 4382 transport_deregister_session_configfs(sess->se_sess); 4383 4384 /* 4385 * If any other processes are accessing this session pointer we must 4386 * wait until they have completed. If we are in an interrupt (the 4387 * time2retain handler) and contain and active session usage count we 4388 * restart the timer and exit. 4389 */ 4390 if (!in_interrupt()) { 4391 if (iscsit_check_session_usage_count(sess) == 1) 4392 iscsit_stop_session(sess, 1, 1); 4393 } else { 4394 if (iscsit_check_session_usage_count(sess) == 2) { 4395 atomic_set(&sess->session_logout, 0); 4396 iscsit_start_time2retain_handler(sess); 4397 return 0; 4398 } 4399 } 4400 4401 transport_deregister_session(sess->se_sess); 4402 4403 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4404 iscsit_free_connection_recovery_entires(sess); 4405 4406 iscsit_free_all_ooo_cmdsns(sess); 4407 4408 spin_lock_bh(&se_tpg->session_lock); 4409 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4410 sess->session_state = TARG_SESS_STATE_FREE; 4411 pr_debug("Released iSCSI session from node: %s\n", 4412 sess->sess_ops->InitiatorName); 4413 tpg->nsessions--; 4414 if (tpg->tpg_tiqn) 4415 tpg->tpg_tiqn->tiqn_nsessions--; 4416 4417 pr_debug("Decremented number of active iSCSI Sessions on" 4418 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4419 4420 spin_lock(&sess_idr_lock); 4421 idr_remove(&sess_idr, sess->session_index); 4422 spin_unlock(&sess_idr_lock); 4423 4424 kfree(sess->sess_ops); 4425 sess->sess_ops = NULL; 4426 spin_unlock_bh(&se_tpg->session_lock); 4427 4428 kfree(sess); 4429 return 0; 4430 } 4431 4432 static void iscsit_logout_post_handler_closesession( 4433 struct iscsi_conn *conn) 4434 { 4435 struct iscsi_session *sess = conn->sess; 4436 4437 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4438 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4439 4440 atomic_set(&conn->conn_logout_remove, 0); 4441 complete(&conn->conn_logout_comp); 4442 4443 iscsit_dec_conn_usage_count(conn); 4444 iscsit_stop_session(sess, 1, 1); 4445 iscsit_dec_session_usage_count(sess); 4446 target_put_session(sess->se_sess); 4447 } 4448 4449 static void iscsit_logout_post_handler_samecid( 4450 struct iscsi_conn *conn) 4451 { 4452 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4453 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4454 4455 atomic_set(&conn->conn_logout_remove, 0); 4456 complete(&conn->conn_logout_comp); 4457 4458 iscsit_cause_connection_reinstatement(conn, 1); 4459 iscsit_dec_conn_usage_count(conn); 4460 } 4461 4462 static void iscsit_logout_post_handler_diffcid( 4463 struct iscsi_conn *conn, 4464 u16 cid) 4465 { 4466 struct iscsi_conn *l_conn; 4467 struct iscsi_session *sess = conn->sess; 4468 4469 if (!sess) 4470 return; 4471 4472 spin_lock_bh(&sess->conn_lock); 4473 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4474 if (l_conn->cid == cid) { 4475 iscsit_inc_conn_usage_count(l_conn); 4476 break; 4477 } 4478 } 4479 spin_unlock_bh(&sess->conn_lock); 4480 4481 if (!l_conn) 4482 return; 4483 4484 if (l_conn->sock) 4485 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4486 4487 spin_lock_bh(&l_conn->state_lock); 4488 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4489 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4490 spin_unlock_bh(&l_conn->state_lock); 4491 4492 iscsit_cause_connection_reinstatement(l_conn, 1); 4493 iscsit_dec_conn_usage_count(l_conn); 4494 } 4495 4496 /* 4497 * Return of 0 causes the TX thread to restart. 4498 */ 4499 int iscsit_logout_post_handler( 4500 struct iscsi_cmd *cmd, 4501 struct iscsi_conn *conn) 4502 { 4503 int ret = 0; 4504 4505 switch (cmd->logout_reason) { 4506 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4507 switch (cmd->logout_response) { 4508 case ISCSI_LOGOUT_SUCCESS: 4509 case ISCSI_LOGOUT_CLEANUP_FAILED: 4510 default: 4511 iscsit_logout_post_handler_closesession(conn); 4512 break; 4513 } 4514 ret = 0; 4515 break; 4516 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4517 if (conn->cid == cmd->logout_cid) { 4518 switch (cmd->logout_response) { 4519 case ISCSI_LOGOUT_SUCCESS: 4520 case ISCSI_LOGOUT_CLEANUP_FAILED: 4521 default: 4522 iscsit_logout_post_handler_samecid(conn); 4523 break; 4524 } 4525 ret = 0; 4526 } else { 4527 switch (cmd->logout_response) { 4528 case ISCSI_LOGOUT_SUCCESS: 4529 iscsit_logout_post_handler_diffcid(conn, 4530 cmd->logout_cid); 4531 break; 4532 case ISCSI_LOGOUT_CID_NOT_FOUND: 4533 case ISCSI_LOGOUT_CLEANUP_FAILED: 4534 default: 4535 break; 4536 } 4537 ret = 1; 4538 } 4539 break; 4540 case ISCSI_LOGOUT_REASON_RECOVERY: 4541 switch (cmd->logout_response) { 4542 case ISCSI_LOGOUT_SUCCESS: 4543 case ISCSI_LOGOUT_CID_NOT_FOUND: 4544 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4545 case ISCSI_LOGOUT_CLEANUP_FAILED: 4546 default: 4547 break; 4548 } 4549 ret = 1; 4550 break; 4551 default: 4552 break; 4553 4554 } 4555 return ret; 4556 } 4557 EXPORT_SYMBOL(iscsit_logout_post_handler); 4558 4559 void iscsit_fail_session(struct iscsi_session *sess) 4560 { 4561 struct iscsi_conn *conn; 4562 4563 spin_lock_bh(&sess->conn_lock); 4564 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4565 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4566 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4567 } 4568 spin_unlock_bh(&sess->conn_lock); 4569 4570 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4571 sess->session_state = TARG_SESS_STATE_FAILED; 4572 } 4573 4574 int iscsit_free_session(struct iscsi_session *sess) 4575 { 4576 u16 conn_count = atomic_read(&sess->nconn); 4577 struct iscsi_conn *conn, *conn_tmp = NULL; 4578 int is_last; 4579 4580 spin_lock_bh(&sess->conn_lock); 4581 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4582 4583 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4584 conn_list) { 4585 if (conn_count == 0) 4586 break; 4587 4588 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4589 is_last = 1; 4590 } else { 4591 iscsit_inc_conn_usage_count(conn_tmp); 4592 is_last = 0; 4593 } 4594 iscsit_inc_conn_usage_count(conn); 4595 4596 spin_unlock_bh(&sess->conn_lock); 4597 iscsit_cause_connection_reinstatement(conn, 1); 4598 spin_lock_bh(&sess->conn_lock); 4599 4600 iscsit_dec_conn_usage_count(conn); 4601 if (is_last == 0) 4602 iscsit_dec_conn_usage_count(conn_tmp); 4603 4604 conn_count--; 4605 } 4606 4607 if (atomic_read(&sess->nconn)) { 4608 spin_unlock_bh(&sess->conn_lock); 4609 wait_for_completion(&sess->session_wait_comp); 4610 } else 4611 spin_unlock_bh(&sess->conn_lock); 4612 4613 target_put_session(sess->se_sess); 4614 return 0; 4615 } 4616 4617 void iscsit_stop_session( 4618 struct iscsi_session *sess, 4619 int session_sleep, 4620 int connection_sleep) 4621 { 4622 u16 conn_count = atomic_read(&sess->nconn); 4623 struct iscsi_conn *conn, *conn_tmp = NULL; 4624 int is_last; 4625 4626 spin_lock_bh(&sess->conn_lock); 4627 if (session_sleep) 4628 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4629 4630 if (connection_sleep) { 4631 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4632 conn_list) { 4633 if (conn_count == 0) 4634 break; 4635 4636 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4637 is_last = 1; 4638 } else { 4639 iscsit_inc_conn_usage_count(conn_tmp); 4640 is_last = 0; 4641 } 4642 iscsit_inc_conn_usage_count(conn); 4643 4644 spin_unlock_bh(&sess->conn_lock); 4645 iscsit_cause_connection_reinstatement(conn, 1); 4646 spin_lock_bh(&sess->conn_lock); 4647 4648 iscsit_dec_conn_usage_count(conn); 4649 if (is_last == 0) 4650 iscsit_dec_conn_usage_count(conn_tmp); 4651 conn_count--; 4652 } 4653 } else { 4654 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4655 iscsit_cause_connection_reinstatement(conn, 0); 4656 } 4657 4658 if (session_sleep && atomic_read(&sess->nconn)) { 4659 spin_unlock_bh(&sess->conn_lock); 4660 wait_for_completion(&sess->session_wait_comp); 4661 } else 4662 spin_unlock_bh(&sess->conn_lock); 4663 } 4664 4665 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4666 { 4667 struct iscsi_session *sess; 4668 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4669 struct se_session *se_sess, *se_sess_tmp; 4670 int session_count = 0; 4671 4672 spin_lock_bh(&se_tpg->session_lock); 4673 if (tpg->nsessions && !force) { 4674 spin_unlock_bh(&se_tpg->session_lock); 4675 return -1; 4676 } 4677 4678 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4679 sess_list) { 4680 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4681 4682 spin_lock(&sess->conn_lock); 4683 if (atomic_read(&sess->session_fall_back_to_erl0) || 4684 atomic_read(&sess->session_logout) || 4685 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4686 spin_unlock(&sess->conn_lock); 4687 continue; 4688 } 4689 atomic_set(&sess->session_reinstatement, 1); 4690 spin_unlock(&sess->conn_lock); 4691 spin_unlock_bh(&se_tpg->session_lock); 4692 4693 iscsit_free_session(sess); 4694 spin_lock_bh(&se_tpg->session_lock); 4695 4696 session_count++; 4697 } 4698 spin_unlock_bh(&se_tpg->session_lock); 4699 4700 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4701 " Group: %hu\n", session_count, tpg->tpgt); 4702 return 0; 4703 } 4704 4705 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4706 MODULE_VERSION("4.1.x"); 4707 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4708 MODULE_LICENSE("GPL"); 4709 4710 module_init(iscsi_target_init_module); 4711 module_exit(iscsi_target_cleanup_module); 4712