1 /******************************************************************************* 2 * This file contains main functions related to the iSCSI Target Core Driver. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21 #include <linux/string.h> 22 #include <linux/kthread.h> 23 #include <linux/crypto.h> 24 #include <linux/completion.h> 25 #include <linux/module.h> 26 #include <linux/idr.h> 27 #include <asm/unaligned.h> 28 #include <scsi/scsi_device.h> 29 #include <scsi/iscsi_proto.h> 30 #include <scsi/scsi_tcq.h> 31 #include <target/target_core_base.h> 32 #include <target/target_core_fabric.h> 33 #include <target/target_core_configfs.h> 34 35 #include "iscsi_target_core.h" 36 #include "iscsi_target_parameters.h" 37 #include "iscsi_target_seq_pdu_list.h" 38 #include "iscsi_target_tq.h" 39 #include "iscsi_target_configfs.h" 40 #include "iscsi_target_datain_values.h" 41 #include "iscsi_target_erl0.h" 42 #include "iscsi_target_erl1.h" 43 #include "iscsi_target_erl2.h" 44 #include "iscsi_target_login.h" 45 #include "iscsi_target_tmr.h" 46 #include "iscsi_target_tpg.h" 47 #include "iscsi_target_util.h" 48 #include "iscsi_target.h" 49 #include "iscsi_target_device.h" 50 #include "iscsi_target_stat.h" 51 52 static LIST_HEAD(g_tiqn_list); 53 static LIST_HEAD(g_np_list); 54 static DEFINE_SPINLOCK(tiqn_lock); 55 static DEFINE_SPINLOCK(np_lock); 56 57 static struct idr tiqn_idr; 58 struct idr sess_idr; 59 struct mutex auth_id_lock; 60 spinlock_t sess_idr_lock; 61 62 struct iscsit_global *iscsit_global; 63 64 struct kmem_cache *lio_cmd_cache; 65 struct kmem_cache *lio_qr_cache; 66 struct kmem_cache *lio_dr_cache; 67 struct kmem_cache *lio_ooo_cache; 68 struct kmem_cache *lio_r2t_cache; 69 70 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 71 unsigned char *buf, u32); 72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *); 73 74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 75 { 76 struct iscsi_tiqn *tiqn = NULL; 77 78 spin_lock(&tiqn_lock); 79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 80 if (!strcmp(tiqn->tiqn, buf)) { 81 82 spin_lock(&tiqn->tiqn_state_lock); 83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 84 tiqn->tiqn_access_count++; 85 spin_unlock(&tiqn->tiqn_state_lock); 86 spin_unlock(&tiqn_lock); 87 return tiqn; 88 } 89 spin_unlock(&tiqn->tiqn_state_lock); 90 } 91 } 92 spin_unlock(&tiqn_lock); 93 94 return NULL; 95 } 96 97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 98 { 99 spin_lock(&tiqn->tiqn_state_lock); 100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 102 spin_unlock(&tiqn->tiqn_state_lock); 103 return 0; 104 } 105 spin_unlock(&tiqn->tiqn_state_lock); 106 107 return -1; 108 } 109 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 111 { 112 spin_lock(&tiqn->tiqn_state_lock); 113 tiqn->tiqn_access_count--; 114 spin_unlock(&tiqn->tiqn_state_lock); 115 } 116 117 /* 118 * Note that IQN formatting is expected to be done in userspace, and 119 * no explict IQN format checks are done here. 120 */ 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 122 { 123 struct iscsi_tiqn *tiqn = NULL; 124 int ret; 125 126 if (strlen(buf) >= ISCSI_IQN_LEN) { 127 pr_err("Target IQN exceeds %d bytes\n", 128 ISCSI_IQN_LEN); 129 return ERR_PTR(-EINVAL); 130 } 131 132 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 133 if (!tiqn) { 134 pr_err("Unable to allocate struct iscsi_tiqn\n"); 135 return ERR_PTR(-ENOMEM); 136 } 137 138 sprintf(tiqn->tiqn, "%s", buf); 139 INIT_LIST_HEAD(&tiqn->tiqn_list); 140 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 141 spin_lock_init(&tiqn->tiqn_state_lock); 142 spin_lock_init(&tiqn->tiqn_tpg_lock); 143 spin_lock_init(&tiqn->sess_err_stats.lock); 144 spin_lock_init(&tiqn->login_stats.lock); 145 spin_lock_init(&tiqn->logout_stats.lock); 146 147 if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) { 148 pr_err("idr_pre_get() for tiqn_idr failed\n"); 149 kfree(tiqn); 150 return ERR_PTR(-ENOMEM); 151 } 152 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 153 154 spin_lock(&tiqn_lock); 155 ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index); 156 if (ret < 0) { 157 pr_err("idr_get_new() failed for tiqn->tiqn_index\n"); 158 spin_unlock(&tiqn_lock); 159 kfree(tiqn); 160 return ERR_PTR(ret); 161 } 162 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 163 spin_unlock(&tiqn_lock); 164 165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 166 167 return tiqn; 168 169 } 170 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 172 { 173 /* 174 * Wait for accesses to said struct iscsi_tiqn to end. 175 */ 176 spin_lock(&tiqn->tiqn_state_lock); 177 while (tiqn->tiqn_access_count != 0) { 178 spin_unlock(&tiqn->tiqn_state_lock); 179 msleep(10); 180 spin_lock(&tiqn->tiqn_state_lock); 181 } 182 spin_unlock(&tiqn->tiqn_state_lock); 183 } 184 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 186 { 187 /* 188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 189 * while holding tiqn->tiqn_state_lock. This means that all subsequent 190 * attempts to access this struct iscsi_tiqn will fail from both transport 191 * fabric and control code paths. 192 */ 193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 194 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 195 return; 196 } 197 198 iscsit_wait_for_tiqn(tiqn); 199 200 spin_lock(&tiqn_lock); 201 list_del(&tiqn->tiqn_list); 202 idr_remove(&tiqn_idr, tiqn->tiqn_index); 203 spin_unlock(&tiqn_lock); 204 205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 206 tiqn->tiqn); 207 kfree(tiqn); 208 } 209 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 211 { 212 int ret; 213 /* 214 * Determine if the network portal is accepting storage traffic. 215 */ 216 spin_lock_bh(&np->np_thread_lock); 217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 218 spin_unlock_bh(&np->np_thread_lock); 219 return -1; 220 } 221 if (np->np_login_tpg) { 222 pr_err("np->np_login_tpg() is not NULL!\n"); 223 spin_unlock_bh(&np->np_thread_lock); 224 return -1; 225 } 226 spin_unlock_bh(&np->np_thread_lock); 227 /* 228 * Determine if the portal group is accepting storage traffic. 229 */ 230 spin_lock_bh(&tpg->tpg_state_lock); 231 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 232 spin_unlock_bh(&tpg->tpg_state_lock); 233 return -1; 234 } 235 spin_unlock_bh(&tpg->tpg_state_lock); 236 237 /* 238 * Here we serialize access across the TIQN+TPG Tuple. 239 */ 240 ret = mutex_lock_interruptible(&tpg->np_login_lock); 241 if ((ret != 0) || signal_pending(current)) 242 return -1; 243 244 spin_lock_bh(&np->np_thread_lock); 245 np->np_login_tpg = tpg; 246 spin_unlock_bh(&np->np_thread_lock); 247 248 return 0; 249 } 250 251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 252 { 253 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 254 255 spin_lock_bh(&np->np_thread_lock); 256 np->np_login_tpg = NULL; 257 spin_unlock_bh(&np->np_thread_lock); 258 259 mutex_unlock(&tpg->np_login_lock); 260 261 if (tiqn) 262 iscsit_put_tiqn_for_login(tiqn); 263 264 return 0; 265 } 266 267 static struct iscsi_np *iscsit_get_np( 268 struct __kernel_sockaddr_storage *sockaddr, 269 int network_transport) 270 { 271 struct sockaddr_in *sock_in, *sock_in_e; 272 struct sockaddr_in6 *sock_in6, *sock_in6_e; 273 struct iscsi_np *np; 274 int ip_match = 0; 275 u16 port; 276 277 spin_lock_bh(&np_lock); 278 list_for_each_entry(np, &g_np_list, np_list) { 279 spin_lock(&np->np_thread_lock); 280 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 281 spin_unlock(&np->np_thread_lock); 282 continue; 283 } 284 285 if (sockaddr->ss_family == AF_INET6) { 286 sock_in6 = (struct sockaddr_in6 *)sockaddr; 287 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 288 289 if (!memcmp(&sock_in6->sin6_addr.in6_u, 290 &sock_in6_e->sin6_addr.in6_u, 291 sizeof(struct in6_addr))) 292 ip_match = 1; 293 294 port = ntohs(sock_in6->sin6_port); 295 } else { 296 sock_in = (struct sockaddr_in *)sockaddr; 297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 298 299 if (sock_in->sin_addr.s_addr == 300 sock_in_e->sin_addr.s_addr) 301 ip_match = 1; 302 303 port = ntohs(sock_in->sin_port); 304 } 305 306 if ((ip_match == 1) && (np->np_port == port) && 307 (np->np_network_transport == network_transport)) { 308 /* 309 * Increment the np_exports reference count now to 310 * prevent iscsit_del_np() below from being called 311 * while iscsi_tpg_add_network_portal() is called. 312 */ 313 np->np_exports++; 314 spin_unlock(&np->np_thread_lock); 315 spin_unlock_bh(&np_lock); 316 return np; 317 } 318 spin_unlock(&np->np_thread_lock); 319 } 320 spin_unlock_bh(&np_lock); 321 322 return NULL; 323 } 324 325 struct iscsi_np *iscsit_add_np( 326 struct __kernel_sockaddr_storage *sockaddr, 327 char *ip_str, 328 int network_transport) 329 { 330 struct sockaddr_in *sock_in; 331 struct sockaddr_in6 *sock_in6; 332 struct iscsi_np *np; 333 int ret; 334 /* 335 * Locate the existing struct iscsi_np if already active.. 336 */ 337 np = iscsit_get_np(sockaddr, network_transport); 338 if (np) 339 return np; 340 341 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 342 if (!np) { 343 pr_err("Unable to allocate memory for struct iscsi_np\n"); 344 return ERR_PTR(-ENOMEM); 345 } 346 347 np->np_flags |= NPF_IP_NETWORK; 348 if (sockaddr->ss_family == AF_INET6) { 349 sock_in6 = (struct sockaddr_in6 *)sockaddr; 350 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str); 351 np->np_port = ntohs(sock_in6->sin6_port); 352 } else { 353 sock_in = (struct sockaddr_in *)sockaddr; 354 sprintf(np->np_ip, "%s", ip_str); 355 np->np_port = ntohs(sock_in->sin_port); 356 } 357 358 np->np_network_transport = network_transport; 359 spin_lock_init(&np->np_thread_lock); 360 init_completion(&np->np_restart_comp); 361 INIT_LIST_HEAD(&np->np_list); 362 363 ret = iscsi_target_setup_login_socket(np, sockaddr); 364 if (ret != 0) { 365 kfree(np); 366 return ERR_PTR(ret); 367 } 368 369 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 370 if (IS_ERR(np->np_thread)) { 371 pr_err("Unable to create kthread: iscsi_np\n"); 372 ret = PTR_ERR(np->np_thread); 373 kfree(np); 374 return ERR_PTR(ret); 375 } 376 /* 377 * Increment the np_exports reference count now to prevent 378 * iscsit_del_np() below from being run while a new call to 379 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 380 * active. We don't need to hold np->np_thread_lock at this 381 * point because iscsi_np has not been added to g_np_list yet. 382 */ 383 np->np_exports = 1; 384 385 spin_lock_bh(&np_lock); 386 list_add_tail(&np->np_list, &g_np_list); 387 spin_unlock_bh(&np_lock); 388 389 pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n", 390 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? 391 "TCP" : "SCTP"); 392 393 return np; 394 } 395 396 int iscsit_reset_np_thread( 397 struct iscsi_np *np, 398 struct iscsi_tpg_np *tpg_np, 399 struct iscsi_portal_group *tpg) 400 { 401 spin_lock_bh(&np->np_thread_lock); 402 if (tpg && tpg_np) { 403 /* 404 * The reset operation need only be performed when the 405 * passed struct iscsi_portal_group has a login in progress 406 * to one of the network portals. 407 */ 408 if (tpg_np->tpg_np->np_login_tpg != tpg) { 409 spin_unlock_bh(&np->np_thread_lock); 410 return 0; 411 } 412 } 413 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 414 spin_unlock_bh(&np->np_thread_lock); 415 return 0; 416 } 417 np->np_thread_state = ISCSI_NP_THREAD_RESET; 418 419 if (np->np_thread) { 420 spin_unlock_bh(&np->np_thread_lock); 421 send_sig(SIGINT, np->np_thread, 1); 422 wait_for_completion(&np->np_restart_comp); 423 spin_lock_bh(&np->np_thread_lock); 424 } 425 spin_unlock_bh(&np->np_thread_lock); 426 427 return 0; 428 } 429 430 static int iscsit_del_np_comm(struct iscsi_np *np) 431 { 432 if (np->np_socket) 433 sock_release(np->np_socket); 434 return 0; 435 } 436 437 int iscsit_del_np(struct iscsi_np *np) 438 { 439 spin_lock_bh(&np->np_thread_lock); 440 np->np_exports--; 441 if (np->np_exports) { 442 spin_unlock_bh(&np->np_thread_lock); 443 return 0; 444 } 445 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 446 spin_unlock_bh(&np->np_thread_lock); 447 448 if (np->np_thread) { 449 /* 450 * We need to send the signal to wakeup Linux/Net 451 * which may be sleeping in sock_accept().. 452 */ 453 send_sig(SIGINT, np->np_thread, 1); 454 kthread_stop(np->np_thread); 455 } 456 iscsit_del_np_comm(np); 457 458 spin_lock_bh(&np_lock); 459 list_del(&np->np_list); 460 spin_unlock_bh(&np_lock); 461 462 pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n", 463 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ? 464 "TCP" : "SCTP"); 465 466 kfree(np); 467 return 0; 468 } 469 470 static int __init iscsi_target_init_module(void) 471 { 472 int ret = 0; 473 474 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 475 476 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 477 if (!iscsit_global) { 478 pr_err("Unable to allocate memory for iscsit_global\n"); 479 return -1; 480 } 481 mutex_init(&auth_id_lock); 482 spin_lock_init(&sess_idr_lock); 483 idr_init(&tiqn_idr); 484 idr_init(&sess_idr); 485 486 ret = iscsi_target_register_configfs(); 487 if (ret < 0) 488 goto out; 489 490 ret = iscsi_thread_set_init(); 491 if (ret < 0) 492 goto configfs_out; 493 494 if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) != 495 TARGET_THREAD_SET_COUNT) { 496 pr_err("iscsi_allocate_thread_sets() returned" 497 " unexpected value!\n"); 498 goto ts_out1; 499 } 500 501 lio_cmd_cache = kmem_cache_create("lio_cmd_cache", 502 sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd), 503 0, NULL); 504 if (!lio_cmd_cache) { 505 pr_err("Unable to kmem_cache_create() for" 506 " lio_cmd_cache\n"); 507 goto ts_out2; 508 } 509 510 lio_qr_cache = kmem_cache_create("lio_qr_cache", 511 sizeof(struct iscsi_queue_req), 512 __alignof__(struct iscsi_queue_req), 0, NULL); 513 if (!lio_qr_cache) { 514 pr_err("nable to kmem_cache_create() for" 515 " lio_qr_cache\n"); 516 goto cmd_out; 517 } 518 519 lio_dr_cache = kmem_cache_create("lio_dr_cache", 520 sizeof(struct iscsi_datain_req), 521 __alignof__(struct iscsi_datain_req), 0, NULL); 522 if (!lio_dr_cache) { 523 pr_err("Unable to kmem_cache_create() for" 524 " lio_dr_cache\n"); 525 goto qr_out; 526 } 527 528 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 529 sizeof(struct iscsi_ooo_cmdsn), 530 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 531 if (!lio_ooo_cache) { 532 pr_err("Unable to kmem_cache_create() for" 533 " lio_ooo_cache\n"); 534 goto dr_out; 535 } 536 537 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 538 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 539 0, NULL); 540 if (!lio_r2t_cache) { 541 pr_err("Unable to kmem_cache_create() for" 542 " lio_r2t_cache\n"); 543 goto ooo_out; 544 } 545 546 if (iscsit_load_discovery_tpg() < 0) 547 goto r2t_out; 548 549 return ret; 550 r2t_out: 551 kmem_cache_destroy(lio_r2t_cache); 552 ooo_out: 553 kmem_cache_destroy(lio_ooo_cache); 554 dr_out: 555 kmem_cache_destroy(lio_dr_cache); 556 qr_out: 557 kmem_cache_destroy(lio_qr_cache); 558 cmd_out: 559 kmem_cache_destroy(lio_cmd_cache); 560 ts_out2: 561 iscsi_deallocate_thread_sets(); 562 ts_out1: 563 iscsi_thread_set_free(); 564 configfs_out: 565 iscsi_target_deregister_configfs(); 566 out: 567 kfree(iscsit_global); 568 return -ENOMEM; 569 } 570 571 static void __exit iscsi_target_cleanup_module(void) 572 { 573 iscsi_deallocate_thread_sets(); 574 iscsi_thread_set_free(); 575 iscsit_release_discovery_tpg(); 576 kmem_cache_destroy(lio_cmd_cache); 577 kmem_cache_destroy(lio_qr_cache); 578 kmem_cache_destroy(lio_dr_cache); 579 kmem_cache_destroy(lio_ooo_cache); 580 kmem_cache_destroy(lio_r2t_cache); 581 582 iscsi_target_deregister_configfs(); 583 584 kfree(iscsit_global); 585 } 586 587 static int iscsit_add_reject( 588 u8 reason, 589 int fail_conn, 590 unsigned char *buf, 591 struct iscsi_conn *conn) 592 { 593 struct iscsi_cmd *cmd; 594 struct iscsi_reject *hdr; 595 int ret; 596 597 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 598 if (!cmd) 599 return -1; 600 601 cmd->iscsi_opcode = ISCSI_OP_REJECT; 602 if (fail_conn) 603 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 604 605 hdr = (struct iscsi_reject *) cmd->pdu; 606 hdr->reason = reason; 607 608 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 609 if (!cmd->buf_ptr) { 610 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 611 iscsit_release_cmd(cmd); 612 return -1; 613 } 614 615 spin_lock_bh(&conn->cmd_lock); 616 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 617 spin_unlock_bh(&conn->cmd_lock); 618 619 cmd->i_state = ISTATE_SEND_REJECT; 620 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 621 622 ret = wait_for_completion_interruptible(&cmd->reject_comp); 623 if (ret != 0) 624 return -1; 625 626 return (!fail_conn) ? 0 : -1; 627 } 628 629 int iscsit_add_reject_from_cmd( 630 u8 reason, 631 int fail_conn, 632 int add_to_conn, 633 unsigned char *buf, 634 struct iscsi_cmd *cmd) 635 { 636 struct iscsi_conn *conn; 637 struct iscsi_reject *hdr; 638 int ret; 639 640 if (!cmd->conn) { 641 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 642 cmd->init_task_tag); 643 return -1; 644 } 645 conn = cmd->conn; 646 647 cmd->iscsi_opcode = ISCSI_OP_REJECT; 648 if (fail_conn) 649 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN; 650 651 hdr = (struct iscsi_reject *) cmd->pdu; 652 hdr->reason = reason; 653 654 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 655 if (!cmd->buf_ptr) { 656 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 657 iscsit_release_cmd(cmd); 658 return -1; 659 } 660 661 if (add_to_conn) { 662 spin_lock_bh(&conn->cmd_lock); 663 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 664 spin_unlock_bh(&conn->cmd_lock); 665 } 666 667 cmd->i_state = ISTATE_SEND_REJECT; 668 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 669 670 ret = wait_for_completion_interruptible(&cmd->reject_comp); 671 if (ret != 0) 672 return -1; 673 674 return (!fail_conn) ? 0 : -1; 675 } 676 677 /* 678 * Map some portion of the allocated scatterlist to an iovec, suitable for 679 * kernel sockets to copy data in/out. 680 */ 681 static int iscsit_map_iovec( 682 struct iscsi_cmd *cmd, 683 struct kvec *iov, 684 u32 data_offset, 685 u32 data_length) 686 { 687 u32 i = 0; 688 struct scatterlist *sg; 689 unsigned int page_off; 690 691 /* 692 * We know each entry in t_data_sg contains a page. 693 */ 694 sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE]; 695 page_off = (data_offset % PAGE_SIZE); 696 697 cmd->first_data_sg = sg; 698 cmd->first_data_sg_off = page_off; 699 700 while (data_length) { 701 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 702 703 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 704 iov[i].iov_len = cur_len; 705 706 data_length -= cur_len; 707 page_off = 0; 708 sg = sg_next(sg); 709 i++; 710 } 711 712 cmd->kmapped_nents = i; 713 714 return i; 715 } 716 717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 718 { 719 u32 i; 720 struct scatterlist *sg; 721 722 sg = cmd->first_data_sg; 723 724 for (i = 0; i < cmd->kmapped_nents; i++) 725 kunmap(sg_page(&sg[i])); 726 } 727 728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 729 { 730 struct iscsi_cmd *cmd; 731 732 conn->exp_statsn = exp_statsn; 733 734 spin_lock_bh(&conn->cmd_lock); 735 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 736 spin_lock(&cmd->istate_lock); 737 if ((cmd->i_state == ISTATE_SENT_STATUS) && 738 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 739 cmd->i_state = ISTATE_REMOVE; 740 spin_unlock(&cmd->istate_lock); 741 iscsit_add_cmd_to_immediate_queue(cmd, conn, 742 cmd->i_state); 743 continue; 744 } 745 spin_unlock(&cmd->istate_lock); 746 } 747 spin_unlock_bh(&conn->cmd_lock); 748 } 749 750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 751 { 752 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 753 754 iov_count += ISCSI_IOV_DATA_BUFFER; 755 756 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 757 if (!cmd->iov_data) { 758 pr_err("Unable to allocate cmd->iov_data\n"); 759 return -ENOMEM; 760 } 761 762 cmd->orig_iov_data_count = iov_count; 763 return 0; 764 } 765 766 static int iscsit_handle_scsi_cmd( 767 struct iscsi_conn *conn, 768 unsigned char *buf) 769 { 770 int data_direction, payload_length, cmdsn_ret = 0, immed_ret; 771 struct iscsi_cmd *cmd = NULL; 772 struct iscsi_scsi_req *hdr; 773 int iscsi_task_attr; 774 int sam_task_attr; 775 776 spin_lock_bh(&conn->sess->session_stats_lock); 777 conn->sess->cmd_pdus++; 778 if (conn->sess->se_sess->se_node_acl) { 779 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 780 conn->sess->se_sess->se_node_acl->num_cmds++; 781 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 782 } 783 spin_unlock_bh(&conn->sess->session_stats_lock); 784 785 hdr = (struct iscsi_scsi_req *) buf; 786 payload_length = ntoh24(hdr->dlength); 787 788 /* FIXME; Add checks for AdditionalHeaderSegment */ 789 790 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 791 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 792 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 793 " not set. Bad iSCSI Initiator.\n"); 794 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 795 buf, conn); 796 } 797 798 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 799 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 800 /* 801 * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2) 802 * that adds support for RESERVE/RELEASE. There is a bug 803 * add with this new functionality that sets R/W bits when 804 * neither CDB carries any READ or WRITE datapayloads. 805 */ 806 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) { 807 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 808 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 809 goto done; 810 } 811 812 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 813 " set when Expected Data Transfer Length is 0 for" 814 " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]); 815 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 816 buf, conn); 817 } 818 done: 819 820 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 821 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 822 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 823 " MUST be set if Expected Data Transfer Length is not 0." 824 " Bad iSCSI Initiator\n"); 825 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 826 buf, conn); 827 } 828 829 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 830 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 831 pr_err("Bidirectional operations not supported!\n"); 832 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 833 buf, conn); 834 } 835 836 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 837 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 838 " Scsi Command PDU.\n"); 839 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 840 buf, conn); 841 } 842 843 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 844 pr_err("ImmediateData=No but DataSegmentLength=%u," 845 " protocol error.\n", payload_length); 846 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 847 buf, conn); 848 } 849 850 if ((be32_to_cpu(hdr->data_length )== payload_length) && 851 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 852 pr_err("Expected Data Transfer Length and Length of" 853 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 854 " bit is not set protocol error\n"); 855 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 856 buf, conn); 857 } 858 859 if (payload_length > be32_to_cpu(hdr->data_length)) { 860 pr_err("DataSegmentLength: %u is greater than" 861 " EDTL: %u, protocol error.\n", payload_length, 862 hdr->data_length); 863 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 864 buf, conn); 865 } 866 867 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 868 pr_err("DataSegmentLength: %u is greater than" 869 " MaxXmitDataSegmentLength: %u, protocol error.\n", 870 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 871 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 872 buf, conn); 873 } 874 875 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 876 pr_err("DataSegmentLength: %u is greater than" 877 " FirstBurstLength: %u, protocol error.\n", 878 payload_length, conn->sess->sess_ops->FirstBurstLength); 879 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1, 880 buf, conn); 881 } 882 883 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 884 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 885 DMA_NONE; 886 887 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 888 if (!cmd) 889 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, 890 buf, conn); 891 892 cmd->data_direction = data_direction; 893 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 894 /* 895 * Figure out the SAM Task Attribute for the incoming SCSI CDB 896 */ 897 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 898 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 899 sam_task_attr = MSG_SIMPLE_TAG; 900 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 901 sam_task_attr = MSG_ORDERED_TAG; 902 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 903 sam_task_attr = MSG_HEAD_TAG; 904 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 905 sam_task_attr = MSG_ACA_TAG; 906 else { 907 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 908 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 909 sam_task_attr = MSG_SIMPLE_TAG; 910 } 911 912 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 913 cmd->i_state = ISTATE_NEW_CMD; 914 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 915 cmd->immediate_data = (payload_length) ? 1 : 0; 916 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 917 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 918 if (cmd->unsolicited_data) 919 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 920 921 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 922 if (hdr->flags & ISCSI_FLAG_CMD_READ) { 923 spin_lock_bh(&conn->sess->ttt_lock); 924 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 925 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 926 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 927 spin_unlock_bh(&conn->sess->ttt_lock); 928 } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE) 929 cmd->targ_xfer_tag = 0xFFFFFFFF; 930 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 931 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 932 cmd->first_burst_len = payload_length; 933 934 if (cmd->data_direction == DMA_FROM_DEVICE) { 935 struct iscsi_datain_req *dr; 936 937 dr = iscsit_allocate_datain_req(); 938 if (!dr) 939 return iscsit_add_reject_from_cmd( 940 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 941 1, 1, buf, cmd); 942 943 iscsit_attach_datain_req(cmd, dr); 944 } 945 946 /* 947 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 948 */ 949 transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, 950 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 951 cmd->data_direction, sam_task_attr, 952 cmd->sense_buffer + 2); 953 954 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 955 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 956 hdr->cmdsn, hdr->data_length, payload_length, conn->cid); 957 958 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 959 scsilun_to_int(&hdr->lun)); 960 if (cmd->sense_reason) 961 goto attach_cmd; 962 963 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 964 if (cmd->sense_reason) { 965 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 966 return iscsit_add_reject_from_cmd( 967 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 968 1, 1, buf, cmd); 969 } 970 971 goto attach_cmd; 972 } 973 974 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 975 return iscsit_add_reject_from_cmd( 976 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 977 1, 1, buf, cmd); 978 } 979 980 attach_cmd: 981 spin_lock_bh(&conn->cmd_lock); 982 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 983 spin_unlock_bh(&conn->cmd_lock); 984 /* 985 * Check if we need to delay processing because of ALUA 986 * Active/NonOptimized primary access state.. 987 */ 988 core_alua_check_nonop_delay(&cmd->se_cmd); 989 990 if (iscsit_allocate_iovecs(cmd) < 0) { 991 return iscsit_add_reject_from_cmd( 992 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 993 1, 0, buf, cmd); 994 } 995 996 /* 997 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 998 * the Immediate Bit is not set, and no Immediate 999 * Data is attached. 1000 * 1001 * A PDU/CmdSN carrying Immediate Data can only 1002 * be processed after the DataCRC has passed. 1003 * If the DataCRC fails, the CmdSN MUST NOT 1004 * be acknowledged. (See below) 1005 */ 1006 if (!cmd->immediate_data) { 1007 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1008 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1009 return 0; 1010 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1011 return iscsit_add_reject_from_cmd( 1012 ISCSI_REASON_PROTOCOL_ERROR, 1013 1, 0, buf, cmd); 1014 } 1015 1016 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1017 1018 /* 1019 * If no Immediate Data is attached, it's OK to return now. 1020 */ 1021 if (!cmd->immediate_data) { 1022 if (!cmd->sense_reason && cmd->unsolicited_data) { 1023 iscsit_set_dataout_sequence_values(cmd); 1024 1025 spin_lock_bh(&cmd->dataout_timeout_lock); 1026 iscsit_start_dataout_timer(cmd, cmd->conn); 1027 spin_unlock_bh(&cmd->dataout_timeout_lock); 1028 } 1029 1030 return 0; 1031 } 1032 1033 /* 1034 * Early CHECK_CONDITIONs never make it to the transport processing 1035 * thread. They are processed in CmdSN order by 1036 * iscsit_check_received_cmdsn() below. 1037 */ 1038 if (cmd->sense_reason) { 1039 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1040 goto after_immediate_data; 1041 } 1042 /* 1043 * Call directly into transport_generic_new_cmd() to perform 1044 * the backend memory allocation. 1045 */ 1046 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1047 if (cmd->sense_reason) { 1048 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1049 goto after_immediate_data; 1050 } 1051 1052 immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length); 1053 after_immediate_data: 1054 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1055 /* 1056 * A PDU/CmdSN carrying Immediate Data passed 1057 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1058 * Immediate Bit is not set. 1059 */ 1060 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1061 /* 1062 * Special case for Unsupported SAM WRITE Opcodes 1063 * and ImmediateData=Yes. 1064 */ 1065 if (cmd->sense_reason) { 1066 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) 1067 return -1; 1068 } else if (cmd->unsolicited_data) { 1069 iscsit_set_dataout_sequence_values(cmd); 1070 1071 spin_lock_bh(&cmd->dataout_timeout_lock); 1072 iscsit_start_dataout_timer(cmd, cmd->conn); 1073 spin_unlock_bh(&cmd->dataout_timeout_lock); 1074 } 1075 1076 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1077 return iscsit_add_reject_from_cmd( 1078 ISCSI_REASON_PROTOCOL_ERROR, 1079 1, 0, buf, cmd); 1080 1081 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1082 /* 1083 * Immediate Data failed DataCRC and ERL>=1, 1084 * silently drop this PDU and let the initiator 1085 * plug the CmdSN gap. 1086 * 1087 * FIXME: Send Unsolicited NOPIN with reserved 1088 * TTT here to help the initiator figure out 1089 * the missing CmdSN, although they should be 1090 * intelligent enough to determine the missing 1091 * CmdSN and issue a retry to plug the sequence. 1092 */ 1093 cmd->i_state = ISTATE_REMOVE; 1094 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 1095 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1096 return -1; 1097 1098 return 0; 1099 } 1100 1101 static u32 iscsit_do_crypto_hash_sg( 1102 struct hash_desc *hash, 1103 struct iscsi_cmd *cmd, 1104 u32 data_offset, 1105 u32 data_length, 1106 u32 padding, 1107 u8 *pad_bytes) 1108 { 1109 u32 data_crc; 1110 u32 i; 1111 struct scatterlist *sg; 1112 unsigned int page_off; 1113 1114 crypto_hash_init(hash); 1115 1116 sg = cmd->first_data_sg; 1117 page_off = cmd->first_data_sg_off; 1118 1119 i = 0; 1120 while (data_length) { 1121 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off)); 1122 1123 crypto_hash_update(hash, &sg[i], cur_len); 1124 1125 data_length -= cur_len; 1126 page_off = 0; 1127 i++; 1128 } 1129 1130 if (padding) { 1131 struct scatterlist pad_sg; 1132 1133 sg_init_one(&pad_sg, pad_bytes, padding); 1134 crypto_hash_update(hash, &pad_sg, padding); 1135 } 1136 crypto_hash_final(hash, (u8 *) &data_crc); 1137 1138 return data_crc; 1139 } 1140 1141 static void iscsit_do_crypto_hash_buf( 1142 struct hash_desc *hash, 1143 unsigned char *buf, 1144 u32 payload_length, 1145 u32 padding, 1146 u8 *pad_bytes, 1147 u8 *data_crc) 1148 { 1149 struct scatterlist sg; 1150 1151 crypto_hash_init(hash); 1152 1153 sg_init_one(&sg, buf, payload_length); 1154 crypto_hash_update(hash, &sg, payload_length); 1155 1156 if (padding) { 1157 sg_init_one(&sg, pad_bytes, padding); 1158 crypto_hash_update(hash, &sg, padding); 1159 } 1160 crypto_hash_final(hash, data_crc); 1161 } 1162 1163 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1164 { 1165 int iov_ret, ooo_cmdsn = 0, ret; 1166 u8 data_crc_failed = 0; 1167 u32 checksum, iov_count = 0, padding = 0, rx_got = 0; 1168 u32 rx_size = 0, payload_length; 1169 struct iscsi_cmd *cmd = NULL; 1170 struct se_cmd *se_cmd; 1171 struct iscsi_data *hdr; 1172 struct kvec *iov; 1173 unsigned long flags; 1174 1175 hdr = (struct iscsi_data *) buf; 1176 payload_length = ntoh24(hdr->dlength); 1177 1178 if (!payload_length) { 1179 pr_err("DataOUT payload is ZERO, protocol error.\n"); 1180 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1181 buf, conn); 1182 } 1183 1184 /* iSCSI write */ 1185 spin_lock_bh(&conn->sess->session_stats_lock); 1186 conn->sess->rx_data_octets += payload_length; 1187 if (conn->sess->se_sess->se_node_acl) { 1188 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 1189 conn->sess->se_sess->se_node_acl->write_bytes += payload_length; 1190 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 1191 } 1192 spin_unlock_bh(&conn->sess->session_stats_lock); 1193 1194 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1195 pr_err("DataSegmentLength: %u is greater than" 1196 " MaxXmitDataSegmentLength: %u\n", payload_length, 1197 conn->conn_ops->MaxXmitDataSegmentLength); 1198 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1199 buf, conn); 1200 } 1201 1202 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1203 payload_length); 1204 if (!cmd) 1205 return 0; 1206 1207 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1208 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1209 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset, 1210 payload_length, conn->cid); 1211 1212 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1213 pr_err("Command ITT: 0x%08x received DataOUT after" 1214 " last DataOUT received, dumping payload\n", 1215 cmd->init_task_tag); 1216 return iscsit_dump_data_payload(conn, payload_length, 1); 1217 } 1218 1219 if (cmd->data_direction != DMA_TO_DEVICE) { 1220 pr_err("Command ITT: 0x%08x received DataOUT for a" 1221 " NON-WRITE command.\n", cmd->init_task_tag); 1222 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, 1223 1, 0, buf, cmd); 1224 } 1225 se_cmd = &cmd->se_cmd; 1226 iscsit_mod_dataout_timer(cmd); 1227 1228 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1229 pr_err("DataOut Offset: %u, Length %u greater than" 1230 " iSCSI Command EDTL %u, protocol error.\n", 1231 hdr->offset, payload_length, cmd->se_cmd.data_length); 1232 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, 1233 1, 0, buf, cmd); 1234 } 1235 1236 if (cmd->unsolicited_data) { 1237 int dump_unsolicited_data = 0; 1238 1239 if (conn->sess->sess_ops->InitialR2T) { 1240 pr_err("Received unexpected unsolicited data" 1241 " while InitialR2T=Yes, protocol error.\n"); 1242 transport_send_check_condition_and_sense(&cmd->se_cmd, 1243 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1244 return -1; 1245 } 1246 /* 1247 * Special case for dealing with Unsolicited DataOUT 1248 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1249 * failures; 1250 */ 1251 1252 /* Something's amiss if we're not in WRITE_PENDING state... */ 1253 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1254 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1255 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1256 1257 spin_lock_irqsave(&se_cmd->t_state_lock, flags); 1258 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1259 dump_unsolicited_data = 1; 1260 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags); 1261 1262 if (dump_unsolicited_data) { 1263 /* 1264 * Check if a delayed TASK_ABORTED status needs to 1265 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1266 * received with the unsolicitied data out. 1267 */ 1268 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1269 iscsit_stop_dataout_timer(cmd); 1270 1271 transport_check_aborted_status(se_cmd, 1272 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1273 return iscsit_dump_data_payload(conn, payload_length, 1); 1274 } 1275 } else { 1276 /* 1277 * For the normal solicited data path: 1278 * 1279 * Check for a delayed TASK_ABORTED status and dump any 1280 * incoming data out payload if one exists. Also, when the 1281 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1282 * data out sequence, we decrement outstanding_r2ts. Once 1283 * outstanding_r2ts reaches zero, go ahead and send the delayed 1284 * TASK_ABORTED status. 1285 */ 1286 if (se_cmd->transport_state & CMD_T_ABORTED) { 1287 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1288 if (--cmd->outstanding_r2ts < 1) { 1289 iscsit_stop_dataout_timer(cmd); 1290 transport_check_aborted_status( 1291 se_cmd, 1); 1292 } 1293 1294 return iscsit_dump_data_payload(conn, payload_length, 1); 1295 } 1296 } 1297 /* 1298 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1299 * within-command recovery checks before receiving the payload. 1300 */ 1301 ret = iscsit_check_pre_dataout(cmd, buf); 1302 if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY) 1303 return 0; 1304 else if (ret == DATAOUT_CANNOT_RECOVER) 1305 return -1; 1306 1307 rx_size += payload_length; 1308 iov = &cmd->iov_data[0]; 1309 1310 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1311 payload_length); 1312 if (iov_ret < 0) 1313 return -1; 1314 1315 iov_count += iov_ret; 1316 1317 padding = ((-payload_length) & 3); 1318 if (padding != 0) { 1319 iov[iov_count].iov_base = cmd->pad_bytes; 1320 iov[iov_count++].iov_len = padding; 1321 rx_size += padding; 1322 pr_debug("Receiving %u padding bytes.\n", padding); 1323 } 1324 1325 if (conn->conn_ops->DataDigest) { 1326 iov[iov_count].iov_base = &checksum; 1327 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1328 rx_size += ISCSI_CRC_LEN; 1329 } 1330 1331 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1332 1333 iscsit_unmap_iovec(cmd); 1334 1335 if (rx_got != rx_size) 1336 return -1; 1337 1338 if (conn->conn_ops->DataDigest) { 1339 u32 data_crc; 1340 1341 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 1342 be32_to_cpu(hdr->offset), 1343 payload_length, padding, 1344 cmd->pad_bytes); 1345 1346 if (checksum != data_crc) { 1347 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1348 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1349 " does not match computed 0x%08x\n", 1350 hdr->itt, hdr->offset, payload_length, 1351 hdr->datasn, checksum, data_crc); 1352 data_crc_failed = 1; 1353 } else { 1354 pr_debug("Got CRC32C DataDigest 0x%08x for" 1355 " %u bytes of Data Out\n", checksum, 1356 payload_length); 1357 } 1358 } 1359 /* 1360 * Increment post receive data and CRC values or perform 1361 * within-command recovery. 1362 */ 1363 ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed); 1364 if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1365 return 0; 1366 else if (ret == DATAOUT_SEND_R2T) { 1367 iscsit_set_dataout_sequence_values(cmd); 1368 iscsit_build_r2ts_for_cmd(cmd, conn, false); 1369 } else if (ret == DATAOUT_SEND_TO_TRANSPORT) { 1370 /* 1371 * Handle extra special case for out of order 1372 * Unsolicited Data Out. 1373 */ 1374 spin_lock_bh(&cmd->istate_lock); 1375 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1376 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1377 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1378 spin_unlock_bh(&cmd->istate_lock); 1379 1380 iscsit_stop_dataout_timer(cmd); 1381 if (ooo_cmdsn) 1382 return 0; 1383 target_execute_cmd(&cmd->se_cmd); 1384 return 0; 1385 } else /* DATAOUT_CANNOT_RECOVER */ 1386 return -1; 1387 1388 return 0; 1389 } 1390 1391 static int iscsit_handle_nop_out( 1392 struct iscsi_conn *conn, 1393 unsigned char *buf) 1394 { 1395 unsigned char *ping_data = NULL; 1396 int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size; 1397 u32 checksum, data_crc, padding = 0, payload_length; 1398 struct iscsi_cmd *cmd = NULL; 1399 struct kvec *iov = NULL; 1400 struct iscsi_nopout *hdr; 1401 1402 hdr = (struct iscsi_nopout *) buf; 1403 payload_length = ntoh24(hdr->dlength); 1404 1405 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1406 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1407 " not set, protocol error.\n"); 1408 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1409 buf, conn); 1410 } 1411 1412 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1413 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1414 " greater than MaxXmitDataSegmentLength: %u, protocol" 1415 " error.\n", payload_length, 1416 conn->conn_ops->MaxXmitDataSegmentLength); 1417 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1418 buf, conn); 1419 } 1420 1421 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x," 1422 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1423 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1424 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1425 payload_length); 1426 /* 1427 * This is not a response to a Unsolicited NopIN, which means 1428 * it can either be a NOPOUT ping request (with a valid ITT), 1429 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1430 * Either way, make sure we allocate an struct iscsi_cmd, as both 1431 * can contain ping data. 1432 */ 1433 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1434 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1435 if (!cmd) 1436 return iscsit_add_reject( 1437 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1438 1, buf, conn); 1439 1440 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1441 cmd->i_state = ISTATE_SEND_NOPIN; 1442 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1443 1 : 0); 1444 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1445 cmd->targ_xfer_tag = 0xFFFFFFFF; 1446 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1447 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1448 cmd->data_direction = DMA_NONE; 1449 } 1450 1451 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1452 rx_size = payload_length; 1453 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1454 if (!ping_data) { 1455 pr_err("Unable to allocate memory for" 1456 " NOPOUT ping data.\n"); 1457 ret = -1; 1458 goto out; 1459 } 1460 1461 iov = &cmd->iov_misc[0]; 1462 iov[niov].iov_base = ping_data; 1463 iov[niov++].iov_len = payload_length; 1464 1465 padding = ((-payload_length) & 3); 1466 if (padding != 0) { 1467 pr_debug("Receiving %u additional bytes" 1468 " for padding.\n", padding); 1469 iov[niov].iov_base = &cmd->pad_bytes; 1470 iov[niov++].iov_len = padding; 1471 rx_size += padding; 1472 } 1473 if (conn->conn_ops->DataDigest) { 1474 iov[niov].iov_base = &checksum; 1475 iov[niov++].iov_len = ISCSI_CRC_LEN; 1476 rx_size += ISCSI_CRC_LEN; 1477 } 1478 1479 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1480 if (rx_got != rx_size) { 1481 ret = -1; 1482 goto out; 1483 } 1484 1485 if (conn->conn_ops->DataDigest) { 1486 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1487 ping_data, payload_length, 1488 padding, cmd->pad_bytes, 1489 (u8 *)&data_crc); 1490 1491 if (checksum != data_crc) { 1492 pr_err("Ping data CRC32C DataDigest" 1493 " 0x%08x does not match computed 0x%08x\n", 1494 checksum, data_crc); 1495 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1496 pr_err("Unable to recover from" 1497 " NOPOUT Ping DataCRC failure while in" 1498 " ERL=0.\n"); 1499 ret = -1; 1500 goto out; 1501 } else { 1502 /* 1503 * Silently drop this PDU and let the 1504 * initiator plug the CmdSN gap. 1505 */ 1506 pr_debug("Dropping NOPOUT" 1507 " Command CmdSN: 0x%08x due to" 1508 " DataCRC error.\n", hdr->cmdsn); 1509 ret = 0; 1510 goto out; 1511 } 1512 } else { 1513 pr_debug("Got CRC32C DataDigest" 1514 " 0x%08x for %u bytes of ping data.\n", 1515 checksum, payload_length); 1516 } 1517 } 1518 1519 ping_data[payload_length] = '\0'; 1520 /* 1521 * Attach ping data to struct iscsi_cmd->buf_ptr. 1522 */ 1523 cmd->buf_ptr = ping_data; 1524 cmd->buf_ptr_size = payload_length; 1525 1526 pr_debug("Got %u bytes of NOPOUT ping" 1527 " data.\n", payload_length); 1528 pr_debug("Ping Data: \"%s\"\n", ping_data); 1529 } 1530 1531 if (hdr->itt != RESERVED_ITT) { 1532 if (!cmd) { 1533 pr_err("Checking CmdSN for NOPOUT," 1534 " but cmd is NULL!\n"); 1535 return -1; 1536 } 1537 /* 1538 * Initiator is expecting a NopIN ping reply, 1539 */ 1540 spin_lock_bh(&conn->cmd_lock); 1541 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1542 spin_unlock_bh(&conn->cmd_lock); 1543 1544 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1545 1546 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1547 iscsit_add_cmd_to_response_queue(cmd, conn, 1548 cmd->i_state); 1549 return 0; 1550 } 1551 1552 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1553 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1554 ret = 0; 1555 goto ping_out; 1556 } 1557 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1558 return iscsit_add_reject_from_cmd( 1559 ISCSI_REASON_PROTOCOL_ERROR, 1560 1, 0, buf, cmd); 1561 1562 return 0; 1563 } 1564 1565 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1566 /* 1567 * This was a response to a unsolicited NOPIN ping. 1568 */ 1569 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1570 if (!cmd) 1571 return -1; 1572 1573 iscsit_stop_nopin_response_timer(conn); 1574 1575 cmd->i_state = ISTATE_REMOVE; 1576 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 1577 iscsit_start_nopin_timer(conn); 1578 } else { 1579 /* 1580 * Initiator is not expecting a NOPIN is response. 1581 * Just ignore for now. 1582 * 1583 * iSCSI v19-91 10.18 1584 * "A NOP-OUT may also be used to confirm a changed 1585 * ExpStatSN if another PDU will not be available 1586 * for a long time." 1587 */ 1588 ret = 0; 1589 goto out; 1590 } 1591 1592 return 0; 1593 out: 1594 if (cmd) 1595 iscsit_release_cmd(cmd); 1596 ping_out: 1597 kfree(ping_data); 1598 return ret; 1599 } 1600 1601 static int iscsit_handle_task_mgt_cmd( 1602 struct iscsi_conn *conn, 1603 unsigned char *buf) 1604 { 1605 struct iscsi_cmd *cmd; 1606 struct se_tmr_req *se_tmr; 1607 struct iscsi_tmr_req *tmr_req; 1608 struct iscsi_tm *hdr; 1609 int out_of_order_cmdsn = 0; 1610 int ret; 1611 u8 function; 1612 1613 hdr = (struct iscsi_tm *) buf; 1614 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1615 function = hdr->flags; 1616 1617 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1618 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1619 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1620 hdr->rtt, hdr->refcmdsn, conn->cid); 1621 1622 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1623 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1624 hdr->rtt != RESERVED_ITT)) { 1625 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1626 hdr->rtt = RESERVED_ITT; 1627 } 1628 1629 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1630 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1631 pr_err("Task Management Request TASK_REASSIGN not" 1632 " issued as immediate command, bad iSCSI Initiator" 1633 "implementation\n"); 1634 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1635 buf, conn); 1636 } 1637 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1638 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1639 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1640 1641 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1642 if (!cmd) 1643 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1644 1, buf, conn); 1645 1646 cmd->data_direction = DMA_NONE; 1647 1648 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1649 if (!cmd->tmr_req) { 1650 pr_err("Unable to allocate memory for" 1651 " Task Management command!\n"); 1652 return iscsit_add_reject_from_cmd( 1653 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1654 1, 1, buf, cmd); 1655 } 1656 1657 /* 1658 * TASK_REASSIGN for ERL=2 / connection stays inside of 1659 * LIO-Target $FABRIC_MOD 1660 */ 1661 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1662 1663 u8 tcm_function; 1664 int ret; 1665 1666 transport_init_se_cmd(&cmd->se_cmd, 1667 &lio_target_fabric_configfs->tf_ops, 1668 conn->sess->se_sess, 0, DMA_NONE, 1669 MSG_SIMPLE_TAG, cmd->sense_buffer + 2); 1670 1671 switch (function) { 1672 case ISCSI_TM_FUNC_ABORT_TASK: 1673 tcm_function = TMR_ABORT_TASK; 1674 break; 1675 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1676 tcm_function = TMR_ABORT_TASK_SET; 1677 break; 1678 case ISCSI_TM_FUNC_CLEAR_ACA: 1679 tcm_function = TMR_CLEAR_ACA; 1680 break; 1681 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1682 tcm_function = TMR_CLEAR_TASK_SET; 1683 break; 1684 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1685 tcm_function = TMR_LUN_RESET; 1686 break; 1687 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1688 tcm_function = TMR_TARGET_WARM_RESET; 1689 break; 1690 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1691 tcm_function = TMR_TARGET_COLD_RESET; 1692 break; 1693 default: 1694 pr_err("Unknown iSCSI TMR Function:" 1695 " 0x%02x\n", function); 1696 return iscsit_add_reject_from_cmd( 1697 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1698 1, 1, buf, cmd); 1699 } 1700 1701 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 1702 tcm_function, GFP_KERNEL); 1703 if (ret < 0) 1704 return iscsit_add_reject_from_cmd( 1705 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1706 1, 1, buf, cmd); 1707 1708 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 1709 } 1710 1711 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 1712 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 1713 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1714 cmd->init_task_tag = hdr->itt; 1715 cmd->targ_xfer_tag = 0xFFFFFFFF; 1716 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1717 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1718 se_tmr = cmd->se_cmd.se_tmr_req; 1719 tmr_req = cmd->tmr_req; 1720 /* 1721 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 1722 */ 1723 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1724 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 1725 scsilun_to_int(&hdr->lun)); 1726 if (ret < 0) { 1727 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 1728 goto attach; 1729 } 1730 } 1731 1732 switch (function) { 1733 case ISCSI_TM_FUNC_ABORT_TASK: 1734 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 1735 if (se_tmr->response) 1736 goto attach; 1737 break; 1738 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1739 case ISCSI_TM_FUNC_CLEAR_ACA: 1740 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1741 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1742 break; 1743 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1744 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 1745 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1746 goto attach; 1747 } 1748 break; 1749 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1750 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 1751 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 1752 goto attach; 1753 } 1754 break; 1755 case ISCSI_TM_FUNC_TASK_REASSIGN: 1756 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 1757 /* 1758 * Perform sanity checks on the ExpDataSN only if the 1759 * TASK_REASSIGN was successful. 1760 */ 1761 if (se_tmr->response) 1762 break; 1763 1764 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 1765 return iscsit_add_reject_from_cmd( 1766 ISCSI_REASON_BOOKMARK_INVALID, 1, 1, 1767 buf, cmd); 1768 break; 1769 default: 1770 pr_err("Unknown TMR function: 0x%02x, protocol" 1771 " error.\n", function); 1772 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 1773 goto attach; 1774 } 1775 1776 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1777 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 1778 se_tmr->call_transport = 1; 1779 attach: 1780 spin_lock_bh(&conn->cmd_lock); 1781 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1782 spin_unlock_bh(&conn->cmd_lock); 1783 1784 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1785 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1786 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 1787 out_of_order_cmdsn = 1; 1788 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1789 return 0; 1790 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1791 return iscsit_add_reject_from_cmd( 1792 ISCSI_REASON_PROTOCOL_ERROR, 1793 1, 0, buf, cmd); 1794 } 1795 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1796 1797 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 1798 return 0; 1799 /* 1800 * Found the referenced task, send to transport for processing. 1801 */ 1802 if (se_tmr->call_transport) 1803 return transport_generic_handle_tmr(&cmd->se_cmd); 1804 1805 /* 1806 * Could not find the referenced LUN, task, or Task Management 1807 * command not authorized or supported. Change state and 1808 * let the tx_thread send the response. 1809 * 1810 * For connection recovery, this is also the default action for 1811 * TMR TASK_REASSIGN. 1812 */ 1813 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1814 return 0; 1815 } 1816 1817 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 1818 static int iscsit_handle_text_cmd( 1819 struct iscsi_conn *conn, 1820 unsigned char *buf) 1821 { 1822 char *text_ptr, *text_in; 1823 int cmdsn_ret, niov = 0, rx_got, rx_size; 1824 u32 checksum = 0, data_crc = 0, payload_length; 1825 u32 padding = 0, pad_bytes = 0, text_length = 0; 1826 struct iscsi_cmd *cmd; 1827 struct kvec iov[3]; 1828 struct iscsi_text *hdr; 1829 1830 hdr = (struct iscsi_text *) buf; 1831 payload_length = ntoh24(hdr->dlength); 1832 1833 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1834 pr_err("Unable to accept text parameter length: %u" 1835 "greater than MaxXmitDataSegmentLength %u.\n", 1836 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1837 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 1838 buf, conn); 1839 } 1840 1841 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 1842 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 1843 hdr->exp_statsn, payload_length); 1844 1845 rx_size = text_length = payload_length; 1846 if (text_length) { 1847 text_in = kzalloc(text_length, GFP_KERNEL); 1848 if (!text_in) { 1849 pr_err("Unable to allocate memory for" 1850 " incoming text parameters\n"); 1851 return -1; 1852 } 1853 1854 memset(iov, 0, 3 * sizeof(struct kvec)); 1855 iov[niov].iov_base = text_in; 1856 iov[niov++].iov_len = text_length; 1857 1858 padding = ((-payload_length) & 3); 1859 if (padding != 0) { 1860 iov[niov].iov_base = &pad_bytes; 1861 iov[niov++].iov_len = padding; 1862 rx_size += padding; 1863 pr_debug("Receiving %u additional bytes" 1864 " for padding.\n", padding); 1865 } 1866 if (conn->conn_ops->DataDigest) { 1867 iov[niov].iov_base = &checksum; 1868 iov[niov++].iov_len = ISCSI_CRC_LEN; 1869 rx_size += ISCSI_CRC_LEN; 1870 } 1871 1872 rx_got = rx_data(conn, &iov[0], niov, rx_size); 1873 if (rx_got != rx_size) { 1874 kfree(text_in); 1875 return -1; 1876 } 1877 1878 if (conn->conn_ops->DataDigest) { 1879 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 1880 text_in, text_length, 1881 padding, (u8 *)&pad_bytes, 1882 (u8 *)&data_crc); 1883 1884 if (checksum != data_crc) { 1885 pr_err("Text data CRC32C DataDigest" 1886 " 0x%08x does not match computed" 1887 " 0x%08x\n", checksum, data_crc); 1888 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1889 pr_err("Unable to recover from" 1890 " Text Data digest failure while in" 1891 " ERL=0.\n"); 1892 kfree(text_in); 1893 return -1; 1894 } else { 1895 /* 1896 * Silently drop this PDU and let the 1897 * initiator plug the CmdSN gap. 1898 */ 1899 pr_debug("Dropping Text" 1900 " Command CmdSN: 0x%08x due to" 1901 " DataCRC error.\n", hdr->cmdsn); 1902 kfree(text_in); 1903 return 0; 1904 } 1905 } else { 1906 pr_debug("Got CRC32C DataDigest" 1907 " 0x%08x for %u bytes of text data.\n", 1908 checksum, text_length); 1909 } 1910 } 1911 text_in[text_length - 1] = '\0'; 1912 pr_debug("Successfully read %d bytes of text" 1913 " data.\n", text_length); 1914 1915 if (strncmp("SendTargets", text_in, 11) != 0) { 1916 pr_err("Received Text Data that is not" 1917 " SendTargets, cannot continue.\n"); 1918 kfree(text_in); 1919 return -1; 1920 } 1921 text_ptr = strchr(text_in, '='); 1922 if (!text_ptr) { 1923 pr_err("No \"=\" separator found in Text Data," 1924 " cannot continue.\n"); 1925 kfree(text_in); 1926 return -1; 1927 } 1928 if (strncmp("=All", text_ptr, 4) != 0) { 1929 pr_err("Unable to locate All value for" 1930 " SendTargets key, cannot continue.\n"); 1931 kfree(text_in); 1932 return -1; 1933 } 1934 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */ 1935 kfree(text_in); 1936 } 1937 1938 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 1939 if (!cmd) 1940 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1941 1, buf, conn); 1942 1943 cmd->iscsi_opcode = ISCSI_OP_TEXT; 1944 cmd->i_state = ISTATE_SEND_TEXTRSP; 1945 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1946 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1947 cmd->targ_xfer_tag = 0xFFFFFFFF; 1948 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1949 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1950 cmd->data_direction = DMA_NONE; 1951 1952 spin_lock_bh(&conn->cmd_lock); 1953 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1954 spin_unlock_bh(&conn->cmd_lock); 1955 1956 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1957 1958 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1959 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 1960 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1961 return iscsit_add_reject_from_cmd( 1962 ISCSI_REASON_PROTOCOL_ERROR, 1963 1, 0, buf, cmd); 1964 1965 return 0; 1966 } 1967 1968 return iscsit_execute_cmd(cmd, 0); 1969 } 1970 1971 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 1972 { 1973 struct iscsi_conn *conn_p; 1974 struct iscsi_session *sess = conn->sess; 1975 1976 pr_debug("Received logout request CLOSESESSION on CID: %hu" 1977 " for SID: %u.\n", conn->cid, conn->sess->sid); 1978 1979 atomic_set(&sess->session_logout, 1); 1980 atomic_set(&conn->conn_logout_remove, 1); 1981 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 1982 1983 iscsit_inc_conn_usage_count(conn); 1984 iscsit_inc_session_usage_count(sess); 1985 1986 spin_lock_bh(&sess->conn_lock); 1987 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 1988 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 1989 continue; 1990 1991 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 1992 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 1993 } 1994 spin_unlock_bh(&sess->conn_lock); 1995 1996 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 1997 1998 return 0; 1999 } 2000 2001 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2002 { 2003 struct iscsi_conn *l_conn; 2004 struct iscsi_session *sess = conn->sess; 2005 2006 pr_debug("Received logout request CLOSECONNECTION for CID:" 2007 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2008 2009 /* 2010 * A Logout Request with a CLOSECONNECTION reason code for a CID 2011 * can arrive on a connection with a differing CID. 2012 */ 2013 if (conn->cid == cmd->logout_cid) { 2014 spin_lock_bh(&conn->state_lock); 2015 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2016 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2017 2018 atomic_set(&conn->conn_logout_remove, 1); 2019 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2020 iscsit_inc_conn_usage_count(conn); 2021 2022 spin_unlock_bh(&conn->state_lock); 2023 } else { 2024 /* 2025 * Handle all different cid CLOSECONNECTION requests in 2026 * iscsit_logout_post_handler_diffcid() as to give enough 2027 * time for any non immediate command's CmdSN to be 2028 * acknowledged on the connection in question. 2029 * 2030 * Here we simply make sure the CID is still around. 2031 */ 2032 l_conn = iscsit_get_conn_from_cid(sess, 2033 cmd->logout_cid); 2034 if (!l_conn) { 2035 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2036 iscsit_add_cmd_to_response_queue(cmd, conn, 2037 cmd->i_state); 2038 return 0; 2039 } 2040 2041 iscsit_dec_conn_usage_count(l_conn); 2042 } 2043 2044 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2045 2046 return 0; 2047 } 2048 2049 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2050 { 2051 struct iscsi_session *sess = conn->sess; 2052 2053 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2054 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2055 2056 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2057 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2058 " while ERL!=2.\n"); 2059 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2060 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2061 return 0; 2062 } 2063 2064 if (conn->cid == cmd->logout_cid) { 2065 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2066 " with CID: %hu on CID: %hu, implementation error.\n", 2067 cmd->logout_cid, conn->cid); 2068 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2069 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2070 return 0; 2071 } 2072 2073 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2074 2075 return 0; 2076 } 2077 2078 static int iscsit_handle_logout_cmd( 2079 struct iscsi_conn *conn, 2080 unsigned char *buf) 2081 { 2082 int cmdsn_ret, logout_remove = 0; 2083 u8 reason_code = 0; 2084 struct iscsi_cmd *cmd; 2085 struct iscsi_logout *hdr; 2086 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2087 2088 hdr = (struct iscsi_logout *) buf; 2089 reason_code = (hdr->flags & 0x7f); 2090 2091 if (tiqn) { 2092 spin_lock(&tiqn->logout_stats.lock); 2093 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2094 tiqn->logout_stats.normal_logouts++; 2095 else 2096 tiqn->logout_stats.abnormal_logouts++; 2097 spin_unlock(&tiqn->logout_stats.lock); 2098 } 2099 2100 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2101 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2102 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2103 hdr->cid, conn->cid); 2104 2105 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2106 pr_err("Received logout request on connection that" 2107 " is not in logged in state, ignoring request.\n"); 2108 return 0; 2109 } 2110 2111 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 2112 if (!cmd) 2113 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1, 2114 buf, conn); 2115 2116 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2117 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2118 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2119 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2120 cmd->targ_xfer_tag = 0xFFFFFFFF; 2121 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2122 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2123 cmd->logout_cid = be16_to_cpu(hdr->cid); 2124 cmd->logout_reason = reason_code; 2125 cmd->data_direction = DMA_NONE; 2126 2127 /* 2128 * We need to sleep in these cases (by returning 1) until the Logout 2129 * Response gets sent in the tx thread. 2130 */ 2131 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2132 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2133 be16_to_cpu(hdr->cid) == conn->cid)) 2134 logout_remove = 1; 2135 2136 spin_lock_bh(&conn->cmd_lock); 2137 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2138 spin_unlock_bh(&conn->cmd_lock); 2139 2140 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2141 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2142 2143 /* 2144 * Immediate commands are executed, well, immediately. 2145 * Non-Immediate Logout Commands are executed in CmdSN order. 2146 */ 2147 if (cmd->immediate_cmd) { 2148 int ret = iscsit_execute_cmd(cmd, 0); 2149 2150 if (ret < 0) 2151 return ret; 2152 } else { 2153 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn); 2154 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2155 logout_remove = 0; 2156 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2157 return iscsit_add_reject_from_cmd( 2158 ISCSI_REASON_PROTOCOL_ERROR, 2159 1, 0, buf, cmd); 2160 } 2161 } 2162 2163 return logout_remove; 2164 } 2165 2166 static int iscsit_handle_snack( 2167 struct iscsi_conn *conn, 2168 unsigned char *buf) 2169 { 2170 struct iscsi_snack *hdr; 2171 2172 hdr = (struct iscsi_snack *) buf; 2173 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2174 2175 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2176 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2177 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2178 hdr->begrun, hdr->runlength, conn->cid); 2179 2180 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2181 pr_err("Initiator sent SNACK request while in" 2182 " ErrorRecoveryLevel=0.\n"); 2183 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2184 buf, conn); 2185 } 2186 /* 2187 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2188 * call from inside iscsi_send_recovery_datain_or_r2t(). 2189 */ 2190 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2191 case 0: 2192 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2193 hdr->itt, 2194 be32_to_cpu(hdr->ttt), 2195 be32_to_cpu(hdr->begrun), 2196 be32_to_cpu(hdr->runlength)); 2197 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2198 return iscsit_handle_status_snack(conn, hdr->itt, 2199 be32_to_cpu(hdr->ttt), 2200 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2201 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2202 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2203 be32_to_cpu(hdr->begrun), 2204 be32_to_cpu(hdr->runlength)); 2205 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2206 /* FIXME: Support R-Data SNACK */ 2207 pr_err("R-Data SNACK Not Supported.\n"); 2208 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2209 buf, conn); 2210 default: 2211 pr_err("Unknown SNACK type 0x%02x, protocol" 2212 " error.\n", hdr->flags & 0x0f); 2213 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 2214 buf, conn); 2215 } 2216 2217 return 0; 2218 } 2219 2220 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2221 { 2222 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2223 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2224 wait_for_completion_interruptible_timeout( 2225 &conn->rx_half_close_comp, 2226 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2227 } 2228 } 2229 2230 static int iscsit_handle_immediate_data( 2231 struct iscsi_cmd *cmd, 2232 unsigned char *buf, 2233 u32 length) 2234 { 2235 int iov_ret, rx_got = 0, rx_size = 0; 2236 u32 checksum, iov_count = 0, padding = 0; 2237 struct iscsi_conn *conn = cmd->conn; 2238 struct kvec *iov; 2239 2240 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2241 if (iov_ret < 0) 2242 return IMMEDIATE_DATA_CANNOT_RECOVER; 2243 2244 rx_size = length; 2245 iov_count = iov_ret; 2246 iov = &cmd->iov_data[0]; 2247 2248 padding = ((-length) & 3); 2249 if (padding != 0) { 2250 iov[iov_count].iov_base = cmd->pad_bytes; 2251 iov[iov_count++].iov_len = padding; 2252 rx_size += padding; 2253 } 2254 2255 if (conn->conn_ops->DataDigest) { 2256 iov[iov_count].iov_base = &checksum; 2257 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2258 rx_size += ISCSI_CRC_LEN; 2259 } 2260 2261 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2262 2263 iscsit_unmap_iovec(cmd); 2264 2265 if (rx_got != rx_size) { 2266 iscsit_rx_thread_wait_for_tcp(conn); 2267 return IMMEDIATE_DATA_CANNOT_RECOVER; 2268 } 2269 2270 if (conn->conn_ops->DataDigest) { 2271 u32 data_crc; 2272 2273 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd, 2274 cmd->write_data_done, length, padding, 2275 cmd->pad_bytes); 2276 2277 if (checksum != data_crc) { 2278 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2279 " does not match computed 0x%08x\n", checksum, 2280 data_crc); 2281 2282 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2283 pr_err("Unable to recover from" 2284 " Immediate Data digest failure while" 2285 " in ERL=0.\n"); 2286 iscsit_add_reject_from_cmd( 2287 ISCSI_REASON_DATA_DIGEST_ERROR, 2288 1, 0, buf, cmd); 2289 return IMMEDIATE_DATA_CANNOT_RECOVER; 2290 } else { 2291 iscsit_add_reject_from_cmd( 2292 ISCSI_REASON_DATA_DIGEST_ERROR, 2293 0, 0, buf, cmd); 2294 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2295 } 2296 } else { 2297 pr_debug("Got CRC32C DataDigest 0x%08x for" 2298 " %u bytes of Immediate Data\n", checksum, 2299 length); 2300 } 2301 } 2302 2303 cmd->write_data_done += length; 2304 2305 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2306 spin_lock_bh(&cmd->istate_lock); 2307 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2308 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2309 spin_unlock_bh(&cmd->istate_lock); 2310 } 2311 2312 return IMMEDIATE_DATA_NORMAL_OPERATION; 2313 } 2314 2315 /* 2316 * Called with sess->conn_lock held. 2317 */ 2318 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2319 with active network interface */ 2320 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2321 { 2322 struct iscsi_cmd *cmd; 2323 struct iscsi_conn *conn_p; 2324 2325 /* 2326 * Only send a Asynchronous Message on connections whos network 2327 * interface is still functional. 2328 */ 2329 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2330 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2331 iscsit_inc_conn_usage_count(conn_p); 2332 break; 2333 } 2334 } 2335 2336 if (!conn_p) 2337 return; 2338 2339 cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC); 2340 if (!cmd) { 2341 iscsit_dec_conn_usage_count(conn_p); 2342 return; 2343 } 2344 2345 cmd->logout_cid = conn->cid; 2346 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2347 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2348 2349 spin_lock_bh(&conn_p->cmd_lock); 2350 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2351 spin_unlock_bh(&conn_p->cmd_lock); 2352 2353 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2354 iscsit_dec_conn_usage_count(conn_p); 2355 } 2356 2357 static int iscsit_send_conn_drop_async_message( 2358 struct iscsi_cmd *cmd, 2359 struct iscsi_conn *conn) 2360 { 2361 struct iscsi_async *hdr; 2362 2363 cmd->tx_size = ISCSI_HDR_LEN; 2364 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2365 2366 hdr = (struct iscsi_async *) cmd->pdu; 2367 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2368 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2369 cmd->init_task_tag = RESERVED_ITT; 2370 cmd->targ_xfer_tag = 0xFFFFFFFF; 2371 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2372 cmd->stat_sn = conn->stat_sn++; 2373 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2374 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2375 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2376 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2377 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2378 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2379 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2380 2381 if (conn->conn_ops->HeaderDigest) { 2382 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2383 2384 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2385 (unsigned char *)hdr, ISCSI_HDR_LEN, 2386 0, NULL, (u8 *)header_digest); 2387 2388 cmd->tx_size += ISCSI_CRC_LEN; 2389 pr_debug("Attaching CRC32C HeaderDigest to" 2390 " Async Message 0x%08x\n", *header_digest); 2391 } 2392 2393 cmd->iov_misc[0].iov_base = cmd->pdu; 2394 cmd->iov_misc[0].iov_len = cmd->tx_size; 2395 cmd->iov_misc_count = 1; 2396 2397 pr_debug("Sending Connection Dropped Async Message StatSN:" 2398 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2399 cmd->logout_cid, conn->cid); 2400 return 0; 2401 } 2402 2403 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2404 { 2405 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2406 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2407 wait_for_completion_interruptible_timeout( 2408 &conn->tx_half_close_comp, 2409 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2410 } 2411 } 2412 2413 static int iscsit_send_data_in( 2414 struct iscsi_cmd *cmd, 2415 struct iscsi_conn *conn) 2416 { 2417 int iov_ret = 0, set_statsn = 0; 2418 u32 iov_count = 0, tx_size = 0; 2419 struct iscsi_datain datain; 2420 struct iscsi_datain_req *dr; 2421 struct iscsi_data_rsp *hdr; 2422 struct kvec *iov; 2423 int eodr = 0; 2424 int ret; 2425 2426 memset(&datain, 0, sizeof(struct iscsi_datain)); 2427 dr = iscsit_get_datain_values(cmd, &datain); 2428 if (!dr) { 2429 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2430 cmd->init_task_tag); 2431 return -1; 2432 } 2433 2434 /* 2435 * Be paranoid and double check the logic for now. 2436 */ 2437 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2438 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2439 " datain.length: %u exceeds cmd->data_length: %u\n", 2440 cmd->init_task_tag, datain.offset, datain.length, 2441 cmd->se_cmd.data_length); 2442 return -1; 2443 } 2444 2445 spin_lock_bh(&conn->sess->session_stats_lock); 2446 conn->sess->tx_data_octets += datain.length; 2447 if (conn->sess->se_sess->se_node_acl) { 2448 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); 2449 conn->sess->se_sess->se_node_acl->read_bytes += datain.length; 2450 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); 2451 } 2452 spin_unlock_bh(&conn->sess->session_stats_lock); 2453 /* 2454 * Special case for successfully execution w/ both DATAIN 2455 * and Sense Data. 2456 */ 2457 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2458 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2459 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2460 else { 2461 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2462 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2463 iscsit_increment_maxcmdsn(cmd, conn->sess); 2464 cmd->stat_sn = conn->stat_sn++; 2465 set_statsn = 1; 2466 } else if (dr->dr_complete == 2467 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2468 set_statsn = 1; 2469 } 2470 2471 hdr = (struct iscsi_data_rsp *) cmd->pdu; 2472 memset(hdr, 0, ISCSI_HDR_LEN); 2473 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2474 hdr->flags = datain.flags; 2475 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2476 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2477 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2478 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2479 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2480 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2481 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2482 } 2483 } 2484 hton24(hdr->dlength, datain.length); 2485 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2486 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2487 (struct scsi_lun *)&hdr->lun); 2488 else 2489 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2490 2491 hdr->itt = cmd->init_task_tag; 2492 2493 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2494 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2495 else 2496 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2497 if (set_statsn) 2498 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2499 else 2500 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2501 2502 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2503 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2504 hdr->datasn = cpu_to_be32(datain.data_sn); 2505 hdr->offset = cpu_to_be32(datain.offset); 2506 2507 iov = &cmd->iov_data[0]; 2508 iov[iov_count].iov_base = cmd->pdu; 2509 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 2510 tx_size += ISCSI_HDR_LEN; 2511 2512 if (conn->conn_ops->HeaderDigest) { 2513 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2514 2515 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2516 (unsigned char *)hdr, ISCSI_HDR_LEN, 2517 0, NULL, (u8 *)header_digest); 2518 2519 iov[0].iov_len += ISCSI_CRC_LEN; 2520 tx_size += ISCSI_CRC_LEN; 2521 2522 pr_debug("Attaching CRC32 HeaderDigest" 2523 " for DataIN PDU 0x%08x\n", *header_digest); 2524 } 2525 2526 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length); 2527 if (iov_ret < 0) 2528 return -1; 2529 2530 iov_count += iov_ret; 2531 tx_size += datain.length; 2532 2533 cmd->padding = ((-datain.length) & 3); 2534 if (cmd->padding) { 2535 iov[iov_count].iov_base = cmd->pad_bytes; 2536 iov[iov_count++].iov_len = cmd->padding; 2537 tx_size += cmd->padding; 2538 2539 pr_debug("Attaching %u padding bytes\n", 2540 cmd->padding); 2541 } 2542 if (conn->conn_ops->DataDigest) { 2543 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd, 2544 datain.offset, datain.length, cmd->padding, cmd->pad_bytes); 2545 2546 iov[iov_count].iov_base = &cmd->data_crc; 2547 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2548 tx_size += ISCSI_CRC_LEN; 2549 2550 pr_debug("Attached CRC32C DataDigest %d bytes, crc" 2551 " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc); 2552 } 2553 2554 cmd->iov_data_count = iov_count; 2555 cmd->tx_size = tx_size; 2556 2557 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2558 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2559 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2560 ntohl(hdr->offset), datain.length, conn->cid); 2561 2562 /* sendpage is preferred but can't insert markers */ 2563 if (!conn->conn_ops->IFMarker) 2564 ret = iscsit_fe_sendpage_sg(cmd, conn); 2565 else 2566 ret = iscsit_send_tx_data(cmd, conn, 0); 2567 2568 iscsit_unmap_iovec(cmd); 2569 2570 if (ret < 0) { 2571 iscsit_tx_thread_wait_for_tcp(conn); 2572 return ret; 2573 } 2574 2575 if (dr->dr_complete) { 2576 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2577 2 : 1; 2578 iscsit_free_datain_req(cmd, dr); 2579 } 2580 2581 return eodr; 2582 } 2583 2584 static int iscsit_send_logout_response( 2585 struct iscsi_cmd *cmd, 2586 struct iscsi_conn *conn) 2587 { 2588 int niov = 0, tx_size; 2589 struct iscsi_conn *logout_conn = NULL; 2590 struct iscsi_conn_recovery *cr = NULL; 2591 struct iscsi_session *sess = conn->sess; 2592 struct kvec *iov; 2593 struct iscsi_logout_rsp *hdr; 2594 /* 2595 * The actual shutting down of Sessions and/or Connections 2596 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2597 * is done in scsi_logout_post_handler(). 2598 */ 2599 switch (cmd->logout_reason) { 2600 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2601 pr_debug("iSCSI session logout successful, setting" 2602 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2603 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2604 break; 2605 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2606 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2607 break; 2608 /* 2609 * For CLOSECONNECTION logout requests carrying 2610 * a matching logout CID -> local CID, the reference 2611 * for the local CID will have been incremented in 2612 * iscsi_logout_closeconnection(). 2613 * 2614 * For CLOSECONNECTION logout requests carrying 2615 * a different CID than the connection it arrived 2616 * on, the connection responding to cmd->logout_cid 2617 * is stopped in iscsit_logout_post_handler_diffcid(). 2618 */ 2619 2620 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2621 " successful.\n", cmd->logout_cid, conn->cid); 2622 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2623 break; 2624 case ISCSI_LOGOUT_REASON_RECOVERY: 2625 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2626 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2627 break; 2628 /* 2629 * If the connection is still active from our point of view 2630 * force connection recovery to occur. 2631 */ 2632 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2633 cmd->logout_cid); 2634 if (logout_conn) { 2635 iscsit_connection_reinstatement_rcfr(logout_conn); 2636 iscsit_dec_conn_usage_count(logout_conn); 2637 } 2638 2639 cr = iscsit_get_inactive_connection_recovery_entry( 2640 conn->sess, cmd->logout_cid); 2641 if (!cr) { 2642 pr_err("Unable to locate CID: %hu for" 2643 " REMOVECONNFORRECOVERY Logout Request.\n", 2644 cmd->logout_cid); 2645 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2646 break; 2647 } 2648 2649 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2650 2651 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2652 " for recovery for CID: %hu on CID: %hu successful.\n", 2653 cmd->logout_cid, conn->cid); 2654 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2655 break; 2656 default: 2657 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2658 cmd->logout_reason); 2659 return -1; 2660 } 2661 2662 tx_size = ISCSI_HDR_LEN; 2663 hdr = (struct iscsi_logout_rsp *)cmd->pdu; 2664 memset(hdr, 0, ISCSI_HDR_LEN); 2665 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2666 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2667 hdr->response = cmd->logout_response; 2668 hdr->itt = cmd->init_task_tag; 2669 cmd->stat_sn = conn->stat_sn++; 2670 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2671 2672 iscsit_increment_maxcmdsn(cmd, conn->sess); 2673 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2674 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2675 2676 iov = &cmd->iov_misc[0]; 2677 iov[niov].iov_base = cmd->pdu; 2678 iov[niov++].iov_len = ISCSI_HDR_LEN; 2679 2680 if (conn->conn_ops->HeaderDigest) { 2681 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2682 2683 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2684 (unsigned char *)hdr, ISCSI_HDR_LEN, 2685 0, NULL, (u8 *)header_digest); 2686 2687 iov[0].iov_len += ISCSI_CRC_LEN; 2688 tx_size += ISCSI_CRC_LEN; 2689 pr_debug("Attaching CRC32C HeaderDigest to" 2690 " Logout Response 0x%08x\n", *header_digest); 2691 } 2692 cmd->iov_misc_count = niov; 2693 cmd->tx_size = tx_size; 2694 2695 pr_debug("Sending Logout Response ITT: 0x%08x StatSN:" 2696 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2697 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2698 cmd->logout_cid, conn->cid); 2699 2700 return 0; 2701 } 2702 2703 /* 2704 * Unsolicited NOPIN, either requesting a response or not. 2705 */ 2706 static int iscsit_send_unsolicited_nopin( 2707 struct iscsi_cmd *cmd, 2708 struct iscsi_conn *conn, 2709 int want_response) 2710 { 2711 int tx_size = ISCSI_HDR_LEN; 2712 struct iscsi_nopin *hdr; 2713 int ret; 2714 2715 hdr = (struct iscsi_nopin *) cmd->pdu; 2716 memset(hdr, 0, ISCSI_HDR_LEN); 2717 hdr->opcode = ISCSI_OP_NOOP_IN; 2718 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2719 hdr->itt = cmd->init_task_tag; 2720 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2721 cmd->stat_sn = conn->stat_sn; 2722 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2723 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2724 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2725 2726 if (conn->conn_ops->HeaderDigest) { 2727 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2728 2729 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2730 (unsigned char *)hdr, ISCSI_HDR_LEN, 2731 0, NULL, (u8 *)header_digest); 2732 2733 tx_size += ISCSI_CRC_LEN; 2734 pr_debug("Attaching CRC32C HeaderDigest to" 2735 " NopIN 0x%08x\n", *header_digest); 2736 } 2737 2738 cmd->iov_misc[0].iov_base = cmd->pdu; 2739 cmd->iov_misc[0].iov_len = tx_size; 2740 cmd->iov_misc_count = 1; 2741 cmd->tx_size = tx_size; 2742 2743 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 2744 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 2745 2746 ret = iscsit_send_tx_data(cmd, conn, 1); 2747 if (ret < 0) { 2748 iscsit_tx_thread_wait_for_tcp(conn); 2749 return ret; 2750 } 2751 2752 spin_lock_bh(&cmd->istate_lock); 2753 cmd->i_state = want_response ? 2754 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 2755 spin_unlock_bh(&cmd->istate_lock); 2756 2757 return 0; 2758 } 2759 2760 static int iscsit_send_nopin_response( 2761 struct iscsi_cmd *cmd, 2762 struct iscsi_conn *conn) 2763 { 2764 int niov = 0, tx_size; 2765 u32 padding = 0; 2766 struct kvec *iov; 2767 struct iscsi_nopin *hdr; 2768 2769 tx_size = ISCSI_HDR_LEN; 2770 hdr = (struct iscsi_nopin *) cmd->pdu; 2771 memset(hdr, 0, ISCSI_HDR_LEN); 2772 hdr->opcode = ISCSI_OP_NOOP_IN; 2773 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2774 hton24(hdr->dlength, cmd->buf_ptr_size); 2775 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2776 hdr->itt = cmd->init_task_tag; 2777 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2778 cmd->stat_sn = conn->stat_sn++; 2779 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2780 2781 iscsit_increment_maxcmdsn(cmd, conn->sess); 2782 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2783 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 2784 2785 iov = &cmd->iov_misc[0]; 2786 iov[niov].iov_base = cmd->pdu; 2787 iov[niov++].iov_len = ISCSI_HDR_LEN; 2788 2789 if (conn->conn_ops->HeaderDigest) { 2790 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2791 2792 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2793 (unsigned char *)hdr, ISCSI_HDR_LEN, 2794 0, NULL, (u8 *)header_digest); 2795 2796 iov[0].iov_len += ISCSI_CRC_LEN; 2797 tx_size += ISCSI_CRC_LEN; 2798 pr_debug("Attaching CRC32C HeaderDigest" 2799 " to NopIn 0x%08x\n", *header_digest); 2800 } 2801 2802 /* 2803 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 2804 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 2805 */ 2806 if (cmd->buf_ptr_size) { 2807 iov[niov].iov_base = cmd->buf_ptr; 2808 iov[niov++].iov_len = cmd->buf_ptr_size; 2809 tx_size += cmd->buf_ptr_size; 2810 2811 pr_debug("Echoing back %u bytes of ping" 2812 " data.\n", cmd->buf_ptr_size); 2813 2814 padding = ((-cmd->buf_ptr_size) & 3); 2815 if (padding != 0) { 2816 iov[niov].iov_base = &cmd->pad_bytes; 2817 iov[niov++].iov_len = padding; 2818 tx_size += padding; 2819 pr_debug("Attaching %u additional" 2820 " padding bytes.\n", padding); 2821 } 2822 if (conn->conn_ops->DataDigest) { 2823 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2824 cmd->buf_ptr, cmd->buf_ptr_size, 2825 padding, (u8 *)&cmd->pad_bytes, 2826 (u8 *)&cmd->data_crc); 2827 2828 iov[niov].iov_base = &cmd->data_crc; 2829 iov[niov++].iov_len = ISCSI_CRC_LEN; 2830 tx_size += ISCSI_CRC_LEN; 2831 pr_debug("Attached DataDigest for %u" 2832 " bytes of ping data, CRC 0x%08x\n", 2833 cmd->buf_ptr_size, cmd->data_crc); 2834 } 2835 } 2836 2837 cmd->iov_misc_count = niov; 2838 cmd->tx_size = tx_size; 2839 2840 pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:" 2841 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag, 2842 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2843 2844 return 0; 2845 } 2846 2847 static int iscsit_send_r2t( 2848 struct iscsi_cmd *cmd, 2849 struct iscsi_conn *conn) 2850 { 2851 int tx_size = 0; 2852 struct iscsi_r2t *r2t; 2853 struct iscsi_r2t_rsp *hdr; 2854 int ret; 2855 2856 r2t = iscsit_get_r2t_from_list(cmd); 2857 if (!r2t) 2858 return -1; 2859 2860 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 2861 memset(hdr, 0, ISCSI_HDR_LEN); 2862 hdr->opcode = ISCSI_OP_R2T; 2863 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2864 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2865 (struct scsi_lun *)&hdr->lun); 2866 hdr->itt = cmd->init_task_tag; 2867 spin_lock_bh(&conn->sess->ttt_lock); 2868 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 2869 if (r2t->targ_xfer_tag == 0xFFFFFFFF) 2870 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++; 2871 spin_unlock_bh(&conn->sess->ttt_lock); 2872 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 2873 hdr->statsn = cpu_to_be32(conn->stat_sn); 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 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 2877 hdr->data_offset = cpu_to_be32(r2t->offset); 2878 hdr->data_length = cpu_to_be32(r2t->xfer_len); 2879 2880 cmd->iov_misc[0].iov_base = cmd->pdu; 2881 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 2882 tx_size += ISCSI_HDR_LEN; 2883 2884 if (conn->conn_ops->HeaderDigest) { 2885 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 2886 2887 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 2888 (unsigned char *)hdr, ISCSI_HDR_LEN, 2889 0, NULL, (u8 *)header_digest); 2890 2891 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 2892 tx_size += ISCSI_CRC_LEN; 2893 pr_debug("Attaching CRC32 HeaderDigest for R2T" 2894 " PDU 0x%08x\n", *header_digest); 2895 } 2896 2897 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 2898 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 2899 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 2900 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 2901 r2t->offset, r2t->xfer_len, conn->cid); 2902 2903 cmd->iov_misc_count = 1; 2904 cmd->tx_size = tx_size; 2905 2906 spin_lock_bh(&cmd->r2t_lock); 2907 r2t->sent_r2t = 1; 2908 spin_unlock_bh(&cmd->r2t_lock); 2909 2910 ret = iscsit_send_tx_data(cmd, conn, 1); 2911 if (ret < 0) { 2912 iscsit_tx_thread_wait_for_tcp(conn); 2913 return ret; 2914 } 2915 2916 spin_lock_bh(&cmd->dataout_timeout_lock); 2917 iscsit_start_dataout_timer(cmd, conn); 2918 spin_unlock_bh(&cmd->dataout_timeout_lock); 2919 2920 return 0; 2921 } 2922 2923 /* 2924 * @recovery: If called from iscsi_task_reassign_complete_write() for 2925 * connection recovery. 2926 */ 2927 int iscsit_build_r2ts_for_cmd( 2928 struct iscsi_cmd *cmd, 2929 struct iscsi_conn *conn, 2930 bool recovery) 2931 { 2932 int first_r2t = 1; 2933 u32 offset = 0, xfer_len = 0; 2934 2935 spin_lock_bh(&cmd->r2t_lock); 2936 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 2937 spin_unlock_bh(&cmd->r2t_lock); 2938 return 0; 2939 } 2940 2941 if (conn->sess->sess_ops->DataSequenceInOrder && 2942 !recovery) 2943 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 2944 2945 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 2946 if (conn->sess->sess_ops->DataSequenceInOrder) { 2947 offset = cmd->r2t_offset; 2948 2949 if (first_r2t && recovery) { 2950 int new_data_end = offset + 2951 conn->sess->sess_ops->MaxBurstLength - 2952 cmd->next_burst_len; 2953 2954 if (new_data_end > cmd->se_cmd.data_length) 2955 xfer_len = cmd->se_cmd.data_length - offset; 2956 else 2957 xfer_len = 2958 conn->sess->sess_ops->MaxBurstLength - 2959 cmd->next_burst_len; 2960 } else { 2961 int new_data_end = offset + 2962 conn->sess->sess_ops->MaxBurstLength; 2963 2964 if (new_data_end > cmd->se_cmd.data_length) 2965 xfer_len = cmd->se_cmd.data_length - offset; 2966 else 2967 xfer_len = conn->sess->sess_ops->MaxBurstLength; 2968 } 2969 cmd->r2t_offset += xfer_len; 2970 2971 if (cmd->r2t_offset == cmd->se_cmd.data_length) 2972 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 2973 } else { 2974 struct iscsi_seq *seq; 2975 2976 seq = iscsit_get_seq_holder_for_r2t(cmd); 2977 if (!seq) { 2978 spin_unlock_bh(&cmd->r2t_lock); 2979 return -1; 2980 } 2981 2982 offset = seq->offset; 2983 xfer_len = seq->xfer_len; 2984 2985 if (cmd->seq_send_order == cmd->seq_count) 2986 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 2987 } 2988 cmd->outstanding_r2ts++; 2989 first_r2t = 0; 2990 2991 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 2992 spin_unlock_bh(&cmd->r2t_lock); 2993 return -1; 2994 } 2995 2996 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 2997 break; 2998 } 2999 spin_unlock_bh(&cmd->r2t_lock); 3000 3001 return 0; 3002 } 3003 3004 static int iscsit_send_status( 3005 struct iscsi_cmd *cmd, 3006 struct iscsi_conn *conn) 3007 { 3008 u8 iov_count = 0, recovery; 3009 u32 padding = 0, tx_size = 0; 3010 struct iscsi_scsi_rsp *hdr; 3011 struct kvec *iov; 3012 3013 recovery = (cmd->i_state != ISTATE_SEND_STATUS); 3014 if (!recovery) 3015 cmd->stat_sn = conn->stat_sn++; 3016 3017 spin_lock_bh(&conn->sess->session_stats_lock); 3018 conn->sess->rsp_pdus++; 3019 spin_unlock_bh(&conn->sess->session_stats_lock); 3020 3021 hdr = (struct iscsi_scsi_rsp *) cmd->pdu; 3022 memset(hdr, 0, ISCSI_HDR_LEN); 3023 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3024 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3025 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3026 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3027 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3028 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3029 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3030 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3031 } 3032 hdr->response = cmd->iscsi_response; 3033 hdr->cmd_status = cmd->se_cmd.scsi_status; 3034 hdr->itt = cmd->init_task_tag; 3035 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3036 3037 iscsit_increment_maxcmdsn(cmd, conn->sess); 3038 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3039 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3040 3041 iov = &cmd->iov_misc[0]; 3042 iov[iov_count].iov_base = cmd->pdu; 3043 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3044 tx_size += ISCSI_HDR_LEN; 3045 3046 /* 3047 * Attach SENSE DATA payload to iSCSI Response PDU 3048 */ 3049 if (cmd->se_cmd.sense_buffer && 3050 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3051 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3052 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3053 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3054 3055 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3056 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3057 iov[iov_count].iov_base = cmd->sense_buffer; 3058 iov[iov_count++].iov_len = 3059 (cmd->se_cmd.scsi_sense_length + padding); 3060 tx_size += cmd->se_cmd.scsi_sense_length; 3061 3062 if (padding) { 3063 memset(cmd->sense_buffer + 3064 cmd->se_cmd.scsi_sense_length, 0, padding); 3065 tx_size += padding; 3066 pr_debug("Adding %u bytes of padding to" 3067 " SENSE.\n", padding); 3068 } 3069 3070 if (conn->conn_ops->DataDigest) { 3071 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3072 cmd->sense_buffer, 3073 (cmd->se_cmd.scsi_sense_length + padding), 3074 0, NULL, (u8 *)&cmd->data_crc); 3075 3076 iov[iov_count].iov_base = &cmd->data_crc; 3077 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3078 tx_size += ISCSI_CRC_LEN; 3079 3080 pr_debug("Attaching CRC32 DataDigest for" 3081 " SENSE, %u bytes CRC 0x%08x\n", 3082 (cmd->se_cmd.scsi_sense_length + padding), 3083 cmd->data_crc); 3084 } 3085 3086 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3087 " Response PDU\n", 3088 cmd->se_cmd.scsi_sense_length); 3089 } 3090 3091 if (conn->conn_ops->HeaderDigest) { 3092 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3093 3094 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3095 (unsigned char *)hdr, ISCSI_HDR_LEN, 3096 0, NULL, (u8 *)header_digest); 3097 3098 iov[0].iov_len += ISCSI_CRC_LEN; 3099 tx_size += ISCSI_CRC_LEN; 3100 pr_debug("Attaching CRC32 HeaderDigest for Response" 3101 " PDU 0x%08x\n", *header_digest); 3102 } 3103 3104 cmd->iov_misc_count = iov_count; 3105 cmd->tx_size = tx_size; 3106 3107 pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3108 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3109 (!recovery) ? "" : "Recovery ", cmd->init_task_tag, 3110 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid); 3111 3112 return 0; 3113 } 3114 3115 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3116 { 3117 switch (se_tmr->response) { 3118 case TMR_FUNCTION_COMPLETE: 3119 return ISCSI_TMF_RSP_COMPLETE; 3120 case TMR_TASK_DOES_NOT_EXIST: 3121 return ISCSI_TMF_RSP_NO_TASK; 3122 case TMR_LUN_DOES_NOT_EXIST: 3123 return ISCSI_TMF_RSP_NO_LUN; 3124 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3125 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3126 case TMR_FUNCTION_AUTHORIZATION_FAILED: 3127 return ISCSI_TMF_RSP_AUTH_FAILED; 3128 case TMR_FUNCTION_REJECTED: 3129 default: 3130 return ISCSI_TMF_RSP_REJECTED; 3131 } 3132 } 3133 3134 static int iscsit_send_task_mgt_rsp( 3135 struct iscsi_cmd *cmd, 3136 struct iscsi_conn *conn) 3137 { 3138 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3139 struct iscsi_tm_rsp *hdr; 3140 u32 tx_size = 0; 3141 3142 hdr = (struct iscsi_tm_rsp *) cmd->pdu; 3143 memset(hdr, 0, ISCSI_HDR_LEN); 3144 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3145 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3146 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3147 hdr->itt = cmd->init_task_tag; 3148 cmd->stat_sn = conn->stat_sn++; 3149 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3150 3151 iscsit_increment_maxcmdsn(cmd, conn->sess); 3152 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3153 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3154 3155 cmd->iov_misc[0].iov_base = cmd->pdu; 3156 cmd->iov_misc[0].iov_len = ISCSI_HDR_LEN; 3157 tx_size += ISCSI_HDR_LEN; 3158 3159 if (conn->conn_ops->HeaderDigest) { 3160 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3161 3162 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3163 (unsigned char *)hdr, ISCSI_HDR_LEN, 3164 0, NULL, (u8 *)header_digest); 3165 3166 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN; 3167 tx_size += ISCSI_CRC_LEN; 3168 pr_debug("Attaching CRC32 HeaderDigest for Task" 3169 " Mgmt Response PDU 0x%08x\n", *header_digest); 3170 } 3171 3172 cmd->iov_misc_count = 1; 3173 cmd->tx_size = tx_size; 3174 3175 pr_debug("Built Task Management Response ITT: 0x%08x," 3176 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3177 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3178 3179 return 0; 3180 } 3181 3182 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3183 { 3184 bool ret = false; 3185 3186 if (np->np_sockaddr.ss_family == AF_INET6) { 3187 const struct sockaddr_in6 sin6 = { 3188 .sin6_addr = IN6ADDR_ANY_INIT }; 3189 struct sockaddr_in6 *sock_in6 = 3190 (struct sockaddr_in6 *)&np->np_sockaddr; 3191 3192 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3193 sin6.sin6_addr.s6_addr, 16)) 3194 ret = true; 3195 } else { 3196 struct sockaddr_in * sock_in = 3197 (struct sockaddr_in *)&np->np_sockaddr; 3198 3199 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3200 ret = true; 3201 } 3202 3203 return ret; 3204 } 3205 3206 #define SENDTARGETS_BUF_LIMIT 32768U 3207 3208 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd) 3209 { 3210 char *payload = NULL; 3211 struct iscsi_conn *conn = cmd->conn; 3212 struct iscsi_portal_group *tpg; 3213 struct iscsi_tiqn *tiqn; 3214 struct iscsi_tpg_np *tpg_np; 3215 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3216 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3217 3218 buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength, 3219 SENDTARGETS_BUF_LIMIT); 3220 3221 payload = kzalloc(buffer_len, GFP_KERNEL); 3222 if (!payload) { 3223 pr_err("Unable to allocate memory for sendtargets" 3224 " response.\n"); 3225 return -ENOMEM; 3226 } 3227 3228 spin_lock(&tiqn_lock); 3229 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3230 len = sprintf(buf, "TargetName=%s", tiqn->tiqn); 3231 len += 1; 3232 3233 if ((len + payload_len) > buffer_len) { 3234 end_of_buf = 1; 3235 goto eob; 3236 } 3237 memcpy(payload + payload_len, buf, len); 3238 payload_len += len; 3239 3240 spin_lock(&tiqn->tiqn_tpg_lock); 3241 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3242 3243 spin_lock(&tpg->tpg_state_lock); 3244 if ((tpg->tpg_state == TPG_STATE_FREE) || 3245 (tpg->tpg_state == TPG_STATE_INACTIVE)) { 3246 spin_unlock(&tpg->tpg_state_lock); 3247 continue; 3248 } 3249 spin_unlock(&tpg->tpg_state_lock); 3250 3251 spin_lock(&tpg->tpg_np_lock); 3252 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3253 tpg_np_list) { 3254 struct iscsi_np *np = tpg_np->tpg_np; 3255 bool inaddr_any = iscsit_check_inaddr_any(np); 3256 3257 len = sprintf(buf, "TargetAddress=" 3258 "%s%s%s:%hu,%hu", 3259 (np->np_sockaddr.ss_family == AF_INET6) ? 3260 "[" : "", (inaddr_any == false) ? 3261 np->np_ip : conn->local_ip, 3262 (np->np_sockaddr.ss_family == AF_INET6) ? 3263 "]" : "", (inaddr_any == false) ? 3264 np->np_port : conn->local_port, 3265 tpg->tpgt); 3266 len += 1; 3267 3268 if ((len + payload_len) > buffer_len) { 3269 spin_unlock(&tpg->tpg_np_lock); 3270 spin_unlock(&tiqn->tiqn_tpg_lock); 3271 end_of_buf = 1; 3272 goto eob; 3273 } 3274 memcpy(payload + payload_len, buf, len); 3275 payload_len += len; 3276 } 3277 spin_unlock(&tpg->tpg_np_lock); 3278 } 3279 spin_unlock(&tiqn->tiqn_tpg_lock); 3280 eob: 3281 if (end_of_buf) 3282 break; 3283 } 3284 spin_unlock(&tiqn_lock); 3285 3286 cmd->buf_ptr = payload; 3287 3288 return payload_len; 3289 } 3290 3291 /* 3292 * FIXME: Add support for F_BIT and C_BIT when the length is longer than 3293 * MaxRecvDataSegmentLength. 3294 */ 3295 static int iscsit_send_text_rsp( 3296 struct iscsi_cmd *cmd, 3297 struct iscsi_conn *conn) 3298 { 3299 struct iscsi_text_rsp *hdr; 3300 struct kvec *iov; 3301 u32 padding = 0, tx_size = 0; 3302 int text_length, iov_count = 0; 3303 3304 text_length = iscsit_build_sendtargets_response(cmd); 3305 if (text_length < 0) 3306 return text_length; 3307 3308 padding = ((-text_length) & 3); 3309 if (padding != 0) { 3310 memset(cmd->buf_ptr + text_length, 0, padding); 3311 pr_debug("Attaching %u additional bytes for" 3312 " padding.\n", padding); 3313 } 3314 3315 hdr = (struct iscsi_text_rsp *) cmd->pdu; 3316 memset(hdr, 0, ISCSI_HDR_LEN); 3317 hdr->opcode = ISCSI_OP_TEXT_RSP; 3318 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3319 hton24(hdr->dlength, text_length); 3320 hdr->itt = cmd->init_task_tag; 3321 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3322 cmd->stat_sn = conn->stat_sn++; 3323 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3324 3325 iscsit_increment_maxcmdsn(cmd, conn->sess); 3326 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3327 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3328 3329 iov = &cmd->iov_misc[0]; 3330 3331 iov[iov_count].iov_base = cmd->pdu; 3332 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3333 iov[iov_count].iov_base = cmd->buf_ptr; 3334 iov[iov_count++].iov_len = text_length + padding; 3335 3336 tx_size += (ISCSI_HDR_LEN + text_length + padding); 3337 3338 if (conn->conn_ops->HeaderDigest) { 3339 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3340 3341 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3342 (unsigned char *)hdr, ISCSI_HDR_LEN, 3343 0, NULL, (u8 *)header_digest); 3344 3345 iov[0].iov_len += ISCSI_CRC_LEN; 3346 tx_size += ISCSI_CRC_LEN; 3347 pr_debug("Attaching CRC32 HeaderDigest for" 3348 " Text Response PDU 0x%08x\n", *header_digest); 3349 } 3350 3351 if (conn->conn_ops->DataDigest) { 3352 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3353 cmd->buf_ptr, (text_length + padding), 3354 0, NULL, (u8 *)&cmd->data_crc); 3355 3356 iov[iov_count].iov_base = &cmd->data_crc; 3357 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3358 tx_size += ISCSI_CRC_LEN; 3359 3360 pr_debug("Attaching DataDigest for %u bytes of text" 3361 " data, CRC 0x%08x\n", (text_length + padding), 3362 cmd->data_crc); 3363 } 3364 3365 cmd->iov_misc_count = iov_count; 3366 cmd->tx_size = tx_size; 3367 3368 pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x," 3369 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn, 3370 text_length, conn->cid); 3371 return 0; 3372 } 3373 3374 static int iscsit_send_reject( 3375 struct iscsi_cmd *cmd, 3376 struct iscsi_conn *conn) 3377 { 3378 u32 iov_count = 0, tx_size = 0; 3379 struct iscsi_reject *hdr; 3380 struct kvec *iov; 3381 3382 hdr = (struct iscsi_reject *) cmd->pdu; 3383 hdr->opcode = ISCSI_OP_REJECT; 3384 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3385 hton24(hdr->dlength, ISCSI_HDR_LEN); 3386 hdr->ffffffff = cpu_to_be32(0xffffffff); 3387 cmd->stat_sn = conn->stat_sn++; 3388 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3389 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3390 hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn); 3391 3392 iov = &cmd->iov_misc[0]; 3393 3394 iov[iov_count].iov_base = cmd->pdu; 3395 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3396 iov[iov_count].iov_base = cmd->buf_ptr; 3397 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 3398 3399 tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN); 3400 3401 if (conn->conn_ops->HeaderDigest) { 3402 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 3403 3404 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3405 (unsigned char *)hdr, ISCSI_HDR_LEN, 3406 0, NULL, (u8 *)header_digest); 3407 3408 iov[0].iov_len += ISCSI_CRC_LEN; 3409 tx_size += ISCSI_CRC_LEN; 3410 pr_debug("Attaching CRC32 HeaderDigest for" 3411 " REJECT PDU 0x%08x\n", *header_digest); 3412 } 3413 3414 if (conn->conn_ops->DataDigest) { 3415 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, 3416 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN, 3417 0, NULL, (u8 *)&cmd->data_crc); 3418 3419 iov[iov_count].iov_base = &cmd->data_crc; 3420 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 3421 tx_size += ISCSI_CRC_LEN; 3422 pr_debug("Attaching CRC32 DataDigest for REJECT" 3423 " PDU 0x%08x\n", cmd->data_crc); 3424 } 3425 3426 cmd->iov_misc_count = iov_count; 3427 cmd->tx_size = tx_size; 3428 3429 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3430 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3431 3432 return 0; 3433 } 3434 3435 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3436 { 3437 struct iscsi_thread_set *ts = conn->thread_set; 3438 int ord, cpu; 3439 /* 3440 * thread_id is assigned from iscsit_global->ts_bitmap from 3441 * within iscsi_thread_set.c:iscsi_allocate_thread_sets() 3442 * 3443 * Here we use thread_id to determine which CPU that this 3444 * iSCSI connection's iscsi_thread_set will be scheduled to 3445 * execute upon. 3446 */ 3447 ord = ts->thread_id % cpumask_weight(cpu_online_mask); 3448 for_each_online_cpu(cpu) { 3449 if (ord-- == 0) { 3450 cpumask_set_cpu(cpu, conn->conn_cpumask); 3451 return; 3452 } 3453 } 3454 /* 3455 * This should never be reached.. 3456 */ 3457 dump_stack(); 3458 cpumask_setall(conn->conn_cpumask); 3459 } 3460 3461 static inline void iscsit_thread_check_cpumask( 3462 struct iscsi_conn *conn, 3463 struct task_struct *p, 3464 int mode) 3465 { 3466 char buf[128]; 3467 /* 3468 * mode == 1 signals iscsi_target_tx_thread() usage. 3469 * mode == 0 signals iscsi_target_rx_thread() usage. 3470 */ 3471 if (mode == 1) { 3472 if (!conn->conn_tx_reset_cpumask) 3473 return; 3474 conn->conn_tx_reset_cpumask = 0; 3475 } else { 3476 if (!conn->conn_rx_reset_cpumask) 3477 return; 3478 conn->conn_rx_reset_cpumask = 0; 3479 } 3480 /* 3481 * Update the CPU mask for this single kthread so that 3482 * both TX and RX kthreads are scheduled to run on the 3483 * same CPU. 3484 */ 3485 memset(buf, 0, 128); 3486 cpumask_scnprintf(buf, 128, conn->conn_cpumask); 3487 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3488 } 3489 3490 static int handle_immediate_queue(struct iscsi_conn *conn) 3491 { 3492 struct iscsi_queue_req *qr; 3493 struct iscsi_cmd *cmd; 3494 u8 state; 3495 int ret; 3496 3497 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3498 atomic_set(&conn->check_immediate_queue, 0); 3499 cmd = qr->cmd; 3500 state = qr->state; 3501 kmem_cache_free(lio_qr_cache, qr); 3502 3503 switch (state) { 3504 case ISTATE_SEND_R2T: 3505 ret = iscsit_send_r2t(cmd, conn); 3506 if (ret < 0) 3507 goto err; 3508 break; 3509 case ISTATE_REMOVE: 3510 if (cmd->data_direction == DMA_TO_DEVICE) 3511 iscsit_stop_dataout_timer(cmd); 3512 3513 spin_lock_bh(&conn->cmd_lock); 3514 list_del(&cmd->i_conn_node); 3515 spin_unlock_bh(&conn->cmd_lock); 3516 3517 iscsit_free_cmd(cmd); 3518 continue; 3519 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3520 iscsit_mod_nopin_response_timer(conn); 3521 ret = iscsit_send_unsolicited_nopin(cmd, 3522 conn, 1); 3523 if (ret < 0) 3524 goto err; 3525 break; 3526 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3527 ret = iscsit_send_unsolicited_nopin(cmd, 3528 conn, 0); 3529 if (ret < 0) 3530 goto err; 3531 break; 3532 default: 3533 pr_err("Unknown Opcode: 0x%02x ITT:" 3534 " 0x%08x, i_state: %d on CID: %hu\n", 3535 cmd->iscsi_opcode, cmd->init_task_tag, state, 3536 conn->cid); 3537 goto err; 3538 } 3539 } 3540 3541 return 0; 3542 3543 err: 3544 return -1; 3545 } 3546 3547 static int handle_response_queue(struct iscsi_conn *conn) 3548 { 3549 struct iscsi_queue_req *qr; 3550 struct iscsi_cmd *cmd; 3551 u8 state; 3552 int ret; 3553 3554 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3555 cmd = qr->cmd; 3556 state = qr->state; 3557 kmem_cache_free(lio_qr_cache, qr); 3558 3559 check_rsp_state: 3560 switch (state) { 3561 case ISTATE_SEND_DATAIN: 3562 ret = iscsit_send_data_in(cmd, conn); 3563 if (ret < 0) 3564 goto err; 3565 else if (!ret) 3566 /* more drs */ 3567 goto check_rsp_state; 3568 else if (ret == 1) { 3569 /* all done */ 3570 spin_lock_bh(&cmd->istate_lock); 3571 cmd->i_state = ISTATE_SENT_STATUS; 3572 spin_unlock_bh(&cmd->istate_lock); 3573 continue; 3574 } else if (ret == 2) { 3575 /* Still must send status, 3576 SCF_TRANSPORT_TASK_SENSE was set */ 3577 spin_lock_bh(&cmd->istate_lock); 3578 cmd->i_state = ISTATE_SEND_STATUS; 3579 spin_unlock_bh(&cmd->istate_lock); 3580 state = ISTATE_SEND_STATUS; 3581 goto check_rsp_state; 3582 } 3583 3584 break; 3585 case ISTATE_SEND_STATUS: 3586 case ISTATE_SEND_STATUS_RECOVERY: 3587 ret = iscsit_send_status(cmd, conn); 3588 break; 3589 case ISTATE_SEND_LOGOUTRSP: 3590 ret = iscsit_send_logout_response(cmd, conn); 3591 break; 3592 case ISTATE_SEND_ASYNCMSG: 3593 ret = iscsit_send_conn_drop_async_message( 3594 cmd, conn); 3595 break; 3596 case ISTATE_SEND_NOPIN: 3597 ret = iscsit_send_nopin_response(cmd, conn); 3598 break; 3599 case ISTATE_SEND_REJECT: 3600 ret = iscsit_send_reject(cmd, conn); 3601 break; 3602 case ISTATE_SEND_TASKMGTRSP: 3603 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3604 if (ret != 0) 3605 break; 3606 ret = iscsit_tmr_post_handler(cmd, conn); 3607 if (ret != 0) 3608 iscsit_fall_back_to_erl0(conn->sess); 3609 break; 3610 case ISTATE_SEND_TEXTRSP: 3611 ret = iscsit_send_text_rsp(cmd, conn); 3612 break; 3613 default: 3614 pr_err("Unknown Opcode: 0x%02x ITT:" 3615 " 0x%08x, i_state: %d on CID: %hu\n", 3616 cmd->iscsi_opcode, cmd->init_task_tag, 3617 state, conn->cid); 3618 goto err; 3619 } 3620 if (ret < 0) 3621 goto err; 3622 3623 if (iscsit_send_tx_data(cmd, conn, 1) < 0) { 3624 iscsit_tx_thread_wait_for_tcp(conn); 3625 iscsit_unmap_iovec(cmd); 3626 goto err; 3627 } 3628 iscsit_unmap_iovec(cmd); 3629 3630 switch (state) { 3631 case ISTATE_SEND_LOGOUTRSP: 3632 if (!iscsit_logout_post_handler(cmd, conn)) 3633 goto restart; 3634 /* fall through */ 3635 case ISTATE_SEND_STATUS: 3636 case ISTATE_SEND_ASYNCMSG: 3637 case ISTATE_SEND_NOPIN: 3638 case ISTATE_SEND_STATUS_RECOVERY: 3639 case ISTATE_SEND_TEXTRSP: 3640 case ISTATE_SEND_TASKMGTRSP: 3641 spin_lock_bh(&cmd->istate_lock); 3642 cmd->i_state = ISTATE_SENT_STATUS; 3643 spin_unlock_bh(&cmd->istate_lock); 3644 break; 3645 case ISTATE_SEND_REJECT: 3646 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) { 3647 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN; 3648 complete(&cmd->reject_comp); 3649 goto err; 3650 } 3651 complete(&cmd->reject_comp); 3652 break; 3653 default: 3654 pr_err("Unknown Opcode: 0x%02x ITT:" 3655 " 0x%08x, i_state: %d on CID: %hu\n", 3656 cmd->iscsi_opcode, cmd->init_task_tag, 3657 cmd->i_state, conn->cid); 3658 goto err; 3659 } 3660 3661 if (atomic_read(&conn->check_immediate_queue)) 3662 break; 3663 } 3664 3665 return 0; 3666 3667 err: 3668 return -1; 3669 restart: 3670 return -EAGAIN; 3671 } 3672 3673 int iscsi_target_tx_thread(void *arg) 3674 { 3675 int ret = 0; 3676 struct iscsi_conn *conn; 3677 struct iscsi_thread_set *ts = arg; 3678 /* 3679 * Allow ourselves to be interrupted by SIGINT so that a 3680 * connection recovery / failure event can be triggered externally. 3681 */ 3682 allow_signal(SIGINT); 3683 3684 restart: 3685 conn = iscsi_tx_thread_pre_handler(ts); 3686 if (!conn) 3687 goto out; 3688 3689 ret = 0; 3690 3691 while (!kthread_should_stop()) { 3692 /* 3693 * Ensure that both TX and RX per connection kthreads 3694 * are scheduled to run on the same CPU. 3695 */ 3696 iscsit_thread_check_cpumask(conn, current, 1); 3697 3698 wait_event_interruptible(conn->queues_wq, 3699 !iscsit_conn_all_queues_empty(conn) || 3700 ts->status == ISCSI_THREAD_SET_RESET); 3701 3702 if ((ts->status == ISCSI_THREAD_SET_RESET) || 3703 signal_pending(current)) 3704 goto transport_err; 3705 3706 ret = handle_immediate_queue(conn); 3707 if (ret < 0) 3708 goto transport_err; 3709 3710 ret = handle_response_queue(conn); 3711 if (ret == -EAGAIN) 3712 goto restart; 3713 else if (ret < 0) 3714 goto transport_err; 3715 } 3716 3717 transport_err: 3718 iscsit_take_action_for_connection_exit(conn); 3719 goto restart; 3720 out: 3721 return 0; 3722 } 3723 3724 int iscsi_target_rx_thread(void *arg) 3725 { 3726 int ret; 3727 u8 buffer[ISCSI_HDR_LEN], opcode; 3728 u32 checksum = 0, digest = 0; 3729 struct iscsi_conn *conn = NULL; 3730 struct iscsi_thread_set *ts = arg; 3731 struct kvec iov; 3732 /* 3733 * Allow ourselves to be interrupted by SIGINT so that a 3734 * connection recovery / failure event can be triggered externally. 3735 */ 3736 allow_signal(SIGINT); 3737 3738 restart: 3739 conn = iscsi_rx_thread_pre_handler(ts); 3740 if (!conn) 3741 goto out; 3742 3743 while (!kthread_should_stop()) { 3744 /* 3745 * Ensure that both TX and RX per connection kthreads 3746 * are scheduled to run on the same CPU. 3747 */ 3748 iscsit_thread_check_cpumask(conn, current, 0); 3749 3750 memset(buffer, 0, ISCSI_HDR_LEN); 3751 memset(&iov, 0, sizeof(struct kvec)); 3752 3753 iov.iov_base = buffer; 3754 iov.iov_len = ISCSI_HDR_LEN; 3755 3756 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3757 if (ret != ISCSI_HDR_LEN) { 3758 iscsit_rx_thread_wait_for_tcp(conn); 3759 goto transport_err; 3760 } 3761 3762 /* 3763 * Set conn->bad_hdr for use with REJECT PDUs. 3764 */ 3765 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN); 3766 3767 if (conn->conn_ops->HeaderDigest) { 3768 iov.iov_base = &digest; 3769 iov.iov_len = ISCSI_CRC_LEN; 3770 3771 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3772 if (ret != ISCSI_CRC_LEN) { 3773 iscsit_rx_thread_wait_for_tcp(conn); 3774 goto transport_err; 3775 } 3776 3777 iscsit_do_crypto_hash_buf(&conn->conn_rx_hash, 3778 buffer, ISCSI_HDR_LEN, 3779 0, NULL, (u8 *)&checksum); 3780 3781 if (digest != checksum) { 3782 pr_err("HeaderDigest CRC32C failed," 3783 " received 0x%08x, computed 0x%08x\n", 3784 digest, checksum); 3785 /* 3786 * Set the PDU to 0xff so it will intentionally 3787 * hit default in the switch below. 3788 */ 3789 memset(buffer, 0xff, ISCSI_HDR_LEN); 3790 spin_lock_bh(&conn->sess->session_stats_lock); 3791 conn->sess->conn_digest_errors++; 3792 spin_unlock_bh(&conn->sess->session_stats_lock); 3793 } else { 3794 pr_debug("Got HeaderDigest CRC32C" 3795 " 0x%08x\n", checksum); 3796 } 3797 } 3798 3799 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3800 goto transport_err; 3801 3802 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3803 3804 if (conn->sess->sess_ops->SessionType && 3805 ((!(opcode & ISCSI_OP_TEXT)) || 3806 (!(opcode & ISCSI_OP_LOGOUT)))) { 3807 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3808 " while in Discovery Session, rejecting.\n", opcode); 3809 iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1, 3810 buffer, conn); 3811 goto transport_err; 3812 } 3813 3814 switch (opcode) { 3815 case ISCSI_OP_SCSI_CMD: 3816 if (iscsit_handle_scsi_cmd(conn, buffer) < 0) 3817 goto transport_err; 3818 break; 3819 case ISCSI_OP_SCSI_DATA_OUT: 3820 if (iscsit_handle_data_out(conn, buffer) < 0) 3821 goto transport_err; 3822 break; 3823 case ISCSI_OP_NOOP_OUT: 3824 if (iscsit_handle_nop_out(conn, buffer) < 0) 3825 goto transport_err; 3826 break; 3827 case ISCSI_OP_SCSI_TMFUNC: 3828 if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0) 3829 goto transport_err; 3830 break; 3831 case ISCSI_OP_TEXT: 3832 if (iscsit_handle_text_cmd(conn, buffer) < 0) 3833 goto transport_err; 3834 break; 3835 case ISCSI_OP_LOGOUT: 3836 ret = iscsit_handle_logout_cmd(conn, buffer); 3837 if (ret > 0) { 3838 wait_for_completion_timeout(&conn->conn_logout_comp, 3839 SECONDS_FOR_LOGOUT_COMP * HZ); 3840 goto transport_err; 3841 } else if (ret < 0) 3842 goto transport_err; 3843 break; 3844 case ISCSI_OP_SNACK: 3845 if (iscsit_handle_snack(conn, buffer) < 0) 3846 goto transport_err; 3847 break; 3848 default: 3849 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", 3850 opcode); 3851 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3852 pr_err("Cannot recover from unknown" 3853 " opcode while ERL=0, closing iSCSI connection" 3854 ".\n"); 3855 goto transport_err; 3856 } 3857 if (!conn->conn_ops->OFMarker) { 3858 pr_err("Unable to recover from unknown" 3859 " opcode while OFMarker=No, closing iSCSI" 3860 " connection.\n"); 3861 goto transport_err; 3862 } 3863 if (iscsit_recover_from_unknown_opcode(conn) < 0) { 3864 pr_err("Unable to recover from unknown" 3865 " opcode, closing iSCSI connection.\n"); 3866 goto transport_err; 3867 } 3868 break; 3869 } 3870 } 3871 3872 transport_err: 3873 if (!signal_pending(current)) 3874 atomic_set(&conn->transport_failed, 1); 3875 iscsit_take_action_for_connection_exit(conn); 3876 goto restart; 3877 out: 3878 return 0; 3879 } 3880 3881 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 3882 { 3883 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 3884 struct iscsi_session *sess = conn->sess; 3885 /* 3886 * We expect this function to only ever be called from either RX or TX 3887 * thread context via iscsit_close_connection() once the other context 3888 * has been reset -> returned sleeping pre-handler state. 3889 */ 3890 spin_lock_bh(&conn->cmd_lock); 3891 list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) { 3892 3893 list_del(&cmd->i_conn_node); 3894 spin_unlock_bh(&conn->cmd_lock); 3895 3896 iscsit_increment_maxcmdsn(cmd, sess); 3897 3898 iscsit_free_cmd(cmd); 3899 3900 spin_lock_bh(&conn->cmd_lock); 3901 } 3902 spin_unlock_bh(&conn->cmd_lock); 3903 } 3904 3905 static void iscsit_stop_timers_for_cmds( 3906 struct iscsi_conn *conn) 3907 { 3908 struct iscsi_cmd *cmd; 3909 3910 spin_lock_bh(&conn->cmd_lock); 3911 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 3912 if (cmd->data_direction == DMA_TO_DEVICE) 3913 iscsit_stop_dataout_timer(cmd); 3914 } 3915 spin_unlock_bh(&conn->cmd_lock); 3916 } 3917 3918 int iscsit_close_connection( 3919 struct iscsi_conn *conn) 3920 { 3921 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 3922 struct iscsi_session *sess = conn->sess; 3923 3924 pr_debug("Closing iSCSI connection CID %hu on SID:" 3925 " %u\n", conn->cid, sess->sid); 3926 /* 3927 * Always up conn_logout_comp just in case the RX Thread is sleeping 3928 * and the logout response never got sent because the connection 3929 * failed. 3930 */ 3931 complete(&conn->conn_logout_comp); 3932 3933 iscsi_release_thread_set(conn); 3934 3935 iscsit_stop_timers_for_cmds(conn); 3936 iscsit_stop_nopin_response_timer(conn); 3937 iscsit_stop_nopin_timer(conn); 3938 iscsit_free_queue_reqs_for_conn(conn); 3939 3940 /* 3941 * During Connection recovery drop unacknowledged out of order 3942 * commands for this connection, and prepare the other commands 3943 * for realligence. 3944 * 3945 * During normal operation clear the out of order commands (but 3946 * do not free the struct iscsi_ooo_cmdsn's) and release all 3947 * struct iscsi_cmds. 3948 */ 3949 if (atomic_read(&conn->connection_recovery)) { 3950 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 3951 iscsit_prepare_cmds_for_realligance(conn); 3952 } else { 3953 iscsit_clear_ooo_cmdsns_for_conn(conn); 3954 iscsit_release_commands_from_conn(conn); 3955 } 3956 3957 /* 3958 * Handle decrementing session or connection usage count if 3959 * a logout response was not able to be sent because the 3960 * connection failed. Fall back to Session Recovery here. 3961 */ 3962 if (atomic_read(&conn->conn_logout_remove)) { 3963 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 3964 iscsit_dec_conn_usage_count(conn); 3965 iscsit_dec_session_usage_count(sess); 3966 } 3967 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 3968 iscsit_dec_conn_usage_count(conn); 3969 3970 atomic_set(&conn->conn_logout_remove, 0); 3971 atomic_set(&sess->session_reinstatement, 0); 3972 atomic_set(&sess->session_fall_back_to_erl0, 1); 3973 } 3974 3975 spin_lock_bh(&sess->conn_lock); 3976 list_del(&conn->conn_list); 3977 3978 /* 3979 * Attempt to let the Initiator know this connection failed by 3980 * sending an Connection Dropped Async Message on another 3981 * active connection. 3982 */ 3983 if (atomic_read(&conn->connection_recovery)) 3984 iscsit_build_conn_drop_async_message(conn); 3985 3986 spin_unlock_bh(&sess->conn_lock); 3987 3988 /* 3989 * If connection reinstatement is being performed on this connection, 3990 * up the connection reinstatement semaphore that is being blocked on 3991 * in iscsit_cause_connection_reinstatement(). 3992 */ 3993 spin_lock_bh(&conn->state_lock); 3994 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 3995 spin_unlock_bh(&conn->state_lock); 3996 complete(&conn->conn_wait_comp); 3997 wait_for_completion(&conn->conn_post_wait_comp); 3998 spin_lock_bh(&conn->state_lock); 3999 } 4000 4001 /* 4002 * If connection reinstatement is being performed on this connection 4003 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4004 * connection wait rcfr semaphore that is being blocked on 4005 * an iscsit_connection_reinstatement_rcfr(). 4006 */ 4007 if (atomic_read(&conn->connection_wait_rcfr)) { 4008 spin_unlock_bh(&conn->state_lock); 4009 complete(&conn->conn_wait_rcfr_comp); 4010 wait_for_completion(&conn->conn_post_wait_comp); 4011 spin_lock_bh(&conn->state_lock); 4012 } 4013 atomic_set(&conn->connection_reinstatement, 1); 4014 spin_unlock_bh(&conn->state_lock); 4015 4016 /* 4017 * If any other processes are accessing this connection pointer we 4018 * must wait until they have completed. 4019 */ 4020 iscsit_check_conn_usage_count(conn); 4021 4022 if (conn->conn_rx_hash.tfm) 4023 crypto_free_hash(conn->conn_rx_hash.tfm); 4024 if (conn->conn_tx_hash.tfm) 4025 crypto_free_hash(conn->conn_tx_hash.tfm); 4026 4027 if (conn->conn_cpumask) 4028 free_cpumask_var(conn->conn_cpumask); 4029 4030 kfree(conn->conn_ops); 4031 conn->conn_ops = NULL; 4032 4033 if (conn->sock) 4034 sock_release(conn->sock); 4035 conn->thread_set = NULL; 4036 4037 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4038 conn->conn_state = TARG_CONN_STATE_FREE; 4039 kfree(conn); 4040 4041 spin_lock_bh(&sess->conn_lock); 4042 atomic_dec(&sess->nconn); 4043 pr_debug("Decremented iSCSI connection count to %hu from node:" 4044 " %s\n", atomic_read(&sess->nconn), 4045 sess->sess_ops->InitiatorName); 4046 /* 4047 * Make sure that if one connection fails in an non ERL=2 iSCSI 4048 * Session that they all fail. 4049 */ 4050 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4051 !atomic_read(&sess->session_logout)) 4052 atomic_set(&sess->session_fall_back_to_erl0, 1); 4053 4054 /* 4055 * If this was not the last connection in the session, and we are 4056 * performing session reinstatement or falling back to ERL=0, call 4057 * iscsit_stop_session() without sleeping to shutdown the other 4058 * active connections. 4059 */ 4060 if (atomic_read(&sess->nconn)) { 4061 if (!atomic_read(&sess->session_reinstatement) && 4062 !atomic_read(&sess->session_fall_back_to_erl0)) { 4063 spin_unlock_bh(&sess->conn_lock); 4064 return 0; 4065 } 4066 if (!atomic_read(&sess->session_stop_active)) { 4067 atomic_set(&sess->session_stop_active, 1); 4068 spin_unlock_bh(&sess->conn_lock); 4069 iscsit_stop_session(sess, 0, 0); 4070 return 0; 4071 } 4072 spin_unlock_bh(&sess->conn_lock); 4073 return 0; 4074 } 4075 4076 /* 4077 * If this was the last connection in the session and one of the 4078 * following is occurring: 4079 * 4080 * Session Reinstatement is not being performed, and are falling back 4081 * to ERL=0 call iscsit_close_session(). 4082 * 4083 * Session Logout was requested. iscsit_close_session() will be called 4084 * elsewhere. 4085 * 4086 * Session Continuation is not being performed, start the Time2Retain 4087 * handler and check if sleep_on_sess_wait_sem is active. 4088 */ 4089 if (!atomic_read(&sess->session_reinstatement) && 4090 atomic_read(&sess->session_fall_back_to_erl0)) { 4091 spin_unlock_bh(&sess->conn_lock); 4092 target_put_session(sess->se_sess); 4093 4094 return 0; 4095 } else if (atomic_read(&sess->session_logout)) { 4096 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4097 sess->session_state = TARG_SESS_STATE_FREE; 4098 spin_unlock_bh(&sess->conn_lock); 4099 4100 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4101 complete(&sess->session_wait_comp); 4102 4103 return 0; 4104 } else { 4105 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4106 sess->session_state = TARG_SESS_STATE_FAILED; 4107 4108 if (!atomic_read(&sess->session_continuation)) { 4109 spin_unlock_bh(&sess->conn_lock); 4110 iscsit_start_time2retain_handler(sess); 4111 } else 4112 spin_unlock_bh(&sess->conn_lock); 4113 4114 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4115 complete(&sess->session_wait_comp); 4116 4117 return 0; 4118 } 4119 spin_unlock_bh(&sess->conn_lock); 4120 4121 return 0; 4122 } 4123 4124 int iscsit_close_session(struct iscsi_session *sess) 4125 { 4126 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); 4127 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4128 4129 if (atomic_read(&sess->nconn)) { 4130 pr_err("%d connection(s) still exist for iSCSI session" 4131 " to %s\n", atomic_read(&sess->nconn), 4132 sess->sess_ops->InitiatorName); 4133 BUG(); 4134 } 4135 4136 spin_lock_bh(&se_tpg->session_lock); 4137 atomic_set(&sess->session_logout, 1); 4138 atomic_set(&sess->session_reinstatement, 1); 4139 iscsit_stop_time2retain_timer(sess); 4140 spin_unlock_bh(&se_tpg->session_lock); 4141 4142 /* 4143 * transport_deregister_session_configfs() will clear the 4144 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4145 * can be setting it again with __transport_register_session() in 4146 * iscsi_post_login_handler() again after the iscsit_stop_session() 4147 * completes in iscsi_np context. 4148 */ 4149 transport_deregister_session_configfs(sess->se_sess); 4150 4151 /* 4152 * If any other processes are accessing this session pointer we must 4153 * wait until they have completed. If we are in an interrupt (the 4154 * time2retain handler) and contain and active session usage count we 4155 * restart the timer and exit. 4156 */ 4157 if (!in_interrupt()) { 4158 if (iscsit_check_session_usage_count(sess) == 1) 4159 iscsit_stop_session(sess, 1, 1); 4160 } else { 4161 if (iscsit_check_session_usage_count(sess) == 2) { 4162 atomic_set(&sess->session_logout, 0); 4163 iscsit_start_time2retain_handler(sess); 4164 return 0; 4165 } 4166 } 4167 4168 transport_deregister_session(sess->se_sess); 4169 4170 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4171 iscsit_free_connection_recovery_entires(sess); 4172 4173 iscsit_free_all_ooo_cmdsns(sess); 4174 4175 spin_lock_bh(&se_tpg->session_lock); 4176 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4177 sess->session_state = TARG_SESS_STATE_FREE; 4178 pr_debug("Released iSCSI session from node: %s\n", 4179 sess->sess_ops->InitiatorName); 4180 tpg->nsessions--; 4181 if (tpg->tpg_tiqn) 4182 tpg->tpg_tiqn->tiqn_nsessions--; 4183 4184 pr_debug("Decremented number of active iSCSI Sessions on" 4185 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4186 4187 spin_lock(&sess_idr_lock); 4188 idr_remove(&sess_idr, sess->session_index); 4189 spin_unlock(&sess_idr_lock); 4190 4191 kfree(sess->sess_ops); 4192 sess->sess_ops = NULL; 4193 spin_unlock_bh(&se_tpg->session_lock); 4194 4195 kfree(sess); 4196 return 0; 4197 } 4198 4199 static void iscsit_logout_post_handler_closesession( 4200 struct iscsi_conn *conn) 4201 { 4202 struct iscsi_session *sess = conn->sess; 4203 4204 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4205 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4206 4207 atomic_set(&conn->conn_logout_remove, 0); 4208 complete(&conn->conn_logout_comp); 4209 4210 iscsit_dec_conn_usage_count(conn); 4211 iscsit_stop_session(sess, 1, 1); 4212 iscsit_dec_session_usage_count(sess); 4213 target_put_session(sess->se_sess); 4214 } 4215 4216 static void iscsit_logout_post_handler_samecid( 4217 struct iscsi_conn *conn) 4218 { 4219 iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD); 4220 iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD); 4221 4222 atomic_set(&conn->conn_logout_remove, 0); 4223 complete(&conn->conn_logout_comp); 4224 4225 iscsit_cause_connection_reinstatement(conn, 1); 4226 iscsit_dec_conn_usage_count(conn); 4227 } 4228 4229 static void iscsit_logout_post_handler_diffcid( 4230 struct iscsi_conn *conn, 4231 u16 cid) 4232 { 4233 struct iscsi_conn *l_conn; 4234 struct iscsi_session *sess = conn->sess; 4235 4236 if (!sess) 4237 return; 4238 4239 spin_lock_bh(&sess->conn_lock); 4240 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4241 if (l_conn->cid == cid) { 4242 iscsit_inc_conn_usage_count(l_conn); 4243 break; 4244 } 4245 } 4246 spin_unlock_bh(&sess->conn_lock); 4247 4248 if (!l_conn) 4249 return; 4250 4251 if (l_conn->sock) 4252 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4253 4254 spin_lock_bh(&l_conn->state_lock); 4255 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4256 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4257 spin_unlock_bh(&l_conn->state_lock); 4258 4259 iscsit_cause_connection_reinstatement(l_conn, 1); 4260 iscsit_dec_conn_usage_count(l_conn); 4261 } 4262 4263 /* 4264 * Return of 0 causes the TX thread to restart. 4265 */ 4266 static int iscsit_logout_post_handler( 4267 struct iscsi_cmd *cmd, 4268 struct iscsi_conn *conn) 4269 { 4270 int ret = 0; 4271 4272 switch (cmd->logout_reason) { 4273 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4274 switch (cmd->logout_response) { 4275 case ISCSI_LOGOUT_SUCCESS: 4276 case ISCSI_LOGOUT_CLEANUP_FAILED: 4277 default: 4278 iscsit_logout_post_handler_closesession(conn); 4279 break; 4280 } 4281 ret = 0; 4282 break; 4283 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4284 if (conn->cid == cmd->logout_cid) { 4285 switch (cmd->logout_response) { 4286 case ISCSI_LOGOUT_SUCCESS: 4287 case ISCSI_LOGOUT_CLEANUP_FAILED: 4288 default: 4289 iscsit_logout_post_handler_samecid(conn); 4290 break; 4291 } 4292 ret = 0; 4293 } else { 4294 switch (cmd->logout_response) { 4295 case ISCSI_LOGOUT_SUCCESS: 4296 iscsit_logout_post_handler_diffcid(conn, 4297 cmd->logout_cid); 4298 break; 4299 case ISCSI_LOGOUT_CID_NOT_FOUND: 4300 case ISCSI_LOGOUT_CLEANUP_FAILED: 4301 default: 4302 break; 4303 } 4304 ret = 1; 4305 } 4306 break; 4307 case ISCSI_LOGOUT_REASON_RECOVERY: 4308 switch (cmd->logout_response) { 4309 case ISCSI_LOGOUT_SUCCESS: 4310 case ISCSI_LOGOUT_CID_NOT_FOUND: 4311 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4312 case ISCSI_LOGOUT_CLEANUP_FAILED: 4313 default: 4314 break; 4315 } 4316 ret = 1; 4317 break; 4318 default: 4319 break; 4320 4321 } 4322 return ret; 4323 } 4324 4325 void iscsit_fail_session(struct iscsi_session *sess) 4326 { 4327 struct iscsi_conn *conn; 4328 4329 spin_lock_bh(&sess->conn_lock); 4330 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4331 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4332 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4333 } 4334 spin_unlock_bh(&sess->conn_lock); 4335 4336 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4337 sess->session_state = TARG_SESS_STATE_FAILED; 4338 } 4339 4340 int iscsit_free_session(struct iscsi_session *sess) 4341 { 4342 u16 conn_count = atomic_read(&sess->nconn); 4343 struct iscsi_conn *conn, *conn_tmp = NULL; 4344 int is_last; 4345 4346 spin_lock_bh(&sess->conn_lock); 4347 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4348 4349 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4350 conn_list) { 4351 if (conn_count == 0) 4352 break; 4353 4354 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4355 is_last = 1; 4356 } else { 4357 iscsit_inc_conn_usage_count(conn_tmp); 4358 is_last = 0; 4359 } 4360 iscsit_inc_conn_usage_count(conn); 4361 4362 spin_unlock_bh(&sess->conn_lock); 4363 iscsit_cause_connection_reinstatement(conn, 1); 4364 spin_lock_bh(&sess->conn_lock); 4365 4366 iscsit_dec_conn_usage_count(conn); 4367 if (is_last == 0) 4368 iscsit_dec_conn_usage_count(conn_tmp); 4369 4370 conn_count--; 4371 } 4372 4373 if (atomic_read(&sess->nconn)) { 4374 spin_unlock_bh(&sess->conn_lock); 4375 wait_for_completion(&sess->session_wait_comp); 4376 } else 4377 spin_unlock_bh(&sess->conn_lock); 4378 4379 target_put_session(sess->se_sess); 4380 return 0; 4381 } 4382 4383 void iscsit_stop_session( 4384 struct iscsi_session *sess, 4385 int session_sleep, 4386 int connection_sleep) 4387 { 4388 u16 conn_count = atomic_read(&sess->nconn); 4389 struct iscsi_conn *conn, *conn_tmp = NULL; 4390 int is_last; 4391 4392 spin_lock_bh(&sess->conn_lock); 4393 if (session_sleep) 4394 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4395 4396 if (connection_sleep) { 4397 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4398 conn_list) { 4399 if (conn_count == 0) 4400 break; 4401 4402 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4403 is_last = 1; 4404 } else { 4405 iscsit_inc_conn_usage_count(conn_tmp); 4406 is_last = 0; 4407 } 4408 iscsit_inc_conn_usage_count(conn); 4409 4410 spin_unlock_bh(&sess->conn_lock); 4411 iscsit_cause_connection_reinstatement(conn, 1); 4412 spin_lock_bh(&sess->conn_lock); 4413 4414 iscsit_dec_conn_usage_count(conn); 4415 if (is_last == 0) 4416 iscsit_dec_conn_usage_count(conn_tmp); 4417 conn_count--; 4418 } 4419 } else { 4420 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4421 iscsit_cause_connection_reinstatement(conn, 0); 4422 } 4423 4424 if (session_sleep && atomic_read(&sess->nconn)) { 4425 spin_unlock_bh(&sess->conn_lock); 4426 wait_for_completion(&sess->session_wait_comp); 4427 } else 4428 spin_unlock_bh(&sess->conn_lock); 4429 } 4430 4431 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4432 { 4433 struct iscsi_session *sess; 4434 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4435 struct se_session *se_sess, *se_sess_tmp; 4436 int session_count = 0; 4437 4438 spin_lock_bh(&se_tpg->session_lock); 4439 if (tpg->nsessions && !force) { 4440 spin_unlock_bh(&se_tpg->session_lock); 4441 return -1; 4442 } 4443 4444 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4445 sess_list) { 4446 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4447 4448 spin_lock(&sess->conn_lock); 4449 if (atomic_read(&sess->session_fall_back_to_erl0) || 4450 atomic_read(&sess->session_logout) || 4451 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4452 spin_unlock(&sess->conn_lock); 4453 continue; 4454 } 4455 atomic_set(&sess->session_reinstatement, 1); 4456 spin_unlock(&sess->conn_lock); 4457 spin_unlock_bh(&se_tpg->session_lock); 4458 4459 iscsit_free_session(sess); 4460 spin_lock_bh(&se_tpg->session_lock); 4461 4462 session_count++; 4463 } 4464 spin_unlock_bh(&se_tpg->session_lock); 4465 4466 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4467 " Group: %hu\n", session_count, tpg->tpgt); 4468 return 0; 4469 } 4470 4471 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4472 MODULE_VERSION("4.1.x"); 4473 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4474 MODULE_LICENSE("GPL"); 4475 4476 module_init(iscsi_target_init_module); 4477 module_exit(iscsi_target_cleanup_module); 4478