1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * This file contains main functions related to the iSCSI Target Core Driver. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 6 * 7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ******************************************************************************/ 10 11 #include <crypto/hash.h> 12 #include <linux/string.h> 13 #include <linux/kthread.h> 14 #include <linux/completion.h> 15 #include <linux/module.h> 16 #include <linux/vmalloc.h> 17 #include <linux/idr.h> 18 #include <linux/delay.h> 19 #include <linux/sched/signal.h> 20 #include <asm/unaligned.h> 21 #include <linux/inet.h> 22 #include <net/ipv6.h> 23 #include <scsi/scsi_proto.h> 24 #include <scsi/iscsi_proto.h> 25 #include <scsi/scsi_tcq.h> 26 #include <target/target_core_base.h> 27 #include <target/target_core_fabric.h> 28 29 #include <target/iscsi/iscsi_target_core.h> 30 #include "iscsi_target_parameters.h" 31 #include "iscsi_target_seq_pdu_list.h" 32 #include "iscsi_target_datain_values.h" 33 #include "iscsi_target_erl0.h" 34 #include "iscsi_target_erl1.h" 35 #include "iscsi_target_erl2.h" 36 #include "iscsi_target_login.h" 37 #include "iscsi_target_tmr.h" 38 #include "iscsi_target_tpg.h" 39 #include "iscsi_target_util.h" 40 #include "iscsi_target.h" 41 #include "iscsi_target_device.h" 42 #include <target/iscsi/iscsi_target_stat.h> 43 44 #include <target/iscsi/iscsi_transport.h> 45 46 static LIST_HEAD(g_tiqn_list); 47 static LIST_HEAD(g_np_list); 48 static DEFINE_SPINLOCK(tiqn_lock); 49 static DEFINE_MUTEX(np_lock); 50 51 static struct idr tiqn_idr; 52 DEFINE_IDA(sess_ida); 53 struct mutex auth_id_lock; 54 55 struct iscsit_global *iscsit_global; 56 57 struct kmem_cache *lio_qr_cache; 58 struct kmem_cache *lio_dr_cache; 59 struct kmem_cache *lio_ooo_cache; 60 struct kmem_cache *lio_r2t_cache; 61 62 static int iscsit_handle_immediate_data(struct iscsit_cmd *, 63 struct iscsi_scsi_req *, u32); 64 65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 66 { 67 struct iscsi_tiqn *tiqn = NULL; 68 69 spin_lock(&tiqn_lock); 70 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 71 if (!strcmp(tiqn->tiqn, buf)) { 72 73 spin_lock(&tiqn->tiqn_state_lock); 74 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 75 tiqn->tiqn_access_count++; 76 spin_unlock(&tiqn->tiqn_state_lock); 77 spin_unlock(&tiqn_lock); 78 return tiqn; 79 } 80 spin_unlock(&tiqn->tiqn_state_lock); 81 } 82 } 83 spin_unlock(&tiqn_lock); 84 85 return NULL; 86 } 87 88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 89 { 90 spin_lock(&tiqn->tiqn_state_lock); 91 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 92 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 93 spin_unlock(&tiqn->tiqn_state_lock); 94 return 0; 95 } 96 spin_unlock(&tiqn->tiqn_state_lock); 97 98 return -1; 99 } 100 101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 102 { 103 spin_lock(&tiqn->tiqn_state_lock); 104 tiqn->tiqn_access_count--; 105 spin_unlock(&tiqn->tiqn_state_lock); 106 } 107 108 /* 109 * Note that IQN formatting is expected to be done in userspace, and 110 * no explict IQN format checks are done here. 111 */ 112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 113 { 114 struct iscsi_tiqn *tiqn = NULL; 115 int ret; 116 117 if (strlen(buf) >= ISCSI_IQN_LEN) { 118 pr_err("Target IQN exceeds %d bytes\n", 119 ISCSI_IQN_LEN); 120 return ERR_PTR(-EINVAL); 121 } 122 123 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); 124 if (!tiqn) 125 return ERR_PTR(-ENOMEM); 126 127 sprintf(tiqn->tiqn, "%s", buf); 128 INIT_LIST_HEAD(&tiqn->tiqn_list); 129 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 130 spin_lock_init(&tiqn->tiqn_state_lock); 131 spin_lock_init(&tiqn->tiqn_tpg_lock); 132 spin_lock_init(&tiqn->sess_err_stats.lock); 133 spin_lock_init(&tiqn->login_stats.lock); 134 spin_lock_init(&tiqn->logout_stats.lock); 135 136 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 137 138 idr_preload(GFP_KERNEL); 139 spin_lock(&tiqn_lock); 140 141 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 142 if (ret < 0) { 143 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 144 spin_unlock(&tiqn_lock); 145 idr_preload_end(); 146 kfree(tiqn); 147 return ERR_PTR(ret); 148 } 149 tiqn->tiqn_index = ret; 150 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 151 152 spin_unlock(&tiqn_lock); 153 idr_preload_end(); 154 155 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 156 157 return tiqn; 158 159 } 160 161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 162 { 163 /* 164 * Wait for accesses to said struct iscsi_tiqn to end. 165 */ 166 spin_lock(&tiqn->tiqn_state_lock); 167 while (tiqn->tiqn_access_count != 0) { 168 spin_unlock(&tiqn->tiqn_state_lock); 169 msleep(10); 170 spin_lock(&tiqn->tiqn_state_lock); 171 } 172 spin_unlock(&tiqn->tiqn_state_lock); 173 } 174 175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 176 { 177 /* 178 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 179 * while holding tiqn->tiqn_state_lock. This means that all subsequent 180 * attempts to access this struct iscsi_tiqn will fail from both transport 181 * fabric and control code paths. 182 */ 183 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 184 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 185 return; 186 } 187 188 iscsit_wait_for_tiqn(tiqn); 189 190 spin_lock(&tiqn_lock); 191 list_del(&tiqn->tiqn_list); 192 idr_remove(&tiqn_idr, tiqn->tiqn_index); 193 spin_unlock(&tiqn_lock); 194 195 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 196 tiqn->tiqn); 197 kfree(tiqn); 198 } 199 200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 201 { 202 int ret; 203 /* 204 * Determine if the network portal is accepting storage traffic. 205 */ 206 spin_lock_bh(&np->np_thread_lock); 207 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 208 spin_unlock_bh(&np->np_thread_lock); 209 return -1; 210 } 211 spin_unlock_bh(&np->np_thread_lock); 212 /* 213 * Determine if the portal group is accepting storage traffic. 214 */ 215 spin_lock_bh(&tpg->tpg_state_lock); 216 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 217 spin_unlock_bh(&tpg->tpg_state_lock); 218 return -1; 219 } 220 spin_unlock_bh(&tpg->tpg_state_lock); 221 222 /* 223 * Here we serialize access across the TIQN+TPG Tuple. 224 */ 225 ret = down_interruptible(&tpg->np_login_sem); 226 if (ret != 0) 227 return -1; 228 229 spin_lock_bh(&tpg->tpg_state_lock); 230 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 231 spin_unlock_bh(&tpg->tpg_state_lock); 232 up(&tpg->np_login_sem); 233 return -1; 234 } 235 spin_unlock_bh(&tpg->tpg_state_lock); 236 237 return 0; 238 } 239 240 void iscsit_login_kref_put(struct kref *kref) 241 { 242 struct iscsi_tpg_np *tpg_np = container_of(kref, 243 struct iscsi_tpg_np, tpg_np_kref); 244 245 complete(&tpg_np->tpg_np_comp); 246 } 247 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 249 struct iscsi_tpg_np *tpg_np) 250 { 251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 252 253 up(&tpg->np_login_sem); 254 255 if (tpg_np) 256 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 257 258 if (tiqn) 259 iscsit_put_tiqn_for_login(tiqn); 260 261 return 0; 262 } 263 264 bool iscsit_check_np_match( 265 struct sockaddr_storage *sockaddr, 266 struct iscsi_np *np, 267 int network_transport) 268 { 269 struct sockaddr_in *sock_in, *sock_in_e; 270 struct sockaddr_in6 *sock_in6, *sock_in6_e; 271 bool ip_match = false; 272 u16 port, port_e; 273 274 if (sockaddr->ss_family == AF_INET6) { 275 sock_in6 = (struct sockaddr_in6 *)sockaddr; 276 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 277 278 if (!memcmp(&sock_in6->sin6_addr.in6_u, 279 &sock_in6_e->sin6_addr.in6_u, 280 sizeof(struct in6_addr))) 281 ip_match = true; 282 283 port = ntohs(sock_in6->sin6_port); 284 port_e = ntohs(sock_in6_e->sin6_port); 285 } else { 286 sock_in = (struct sockaddr_in *)sockaddr; 287 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 288 289 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 290 ip_match = true; 291 292 port = ntohs(sock_in->sin_port); 293 port_e = ntohs(sock_in_e->sin_port); 294 } 295 296 if (ip_match && (port_e == port) && 297 (np->np_network_transport == network_transport)) 298 return true; 299 300 return false; 301 } 302 303 static struct iscsi_np *iscsit_get_np( 304 struct sockaddr_storage *sockaddr, 305 int network_transport) 306 { 307 struct iscsi_np *np; 308 bool match; 309 310 lockdep_assert_held(&np_lock); 311 312 list_for_each_entry(np, &g_np_list, np_list) { 313 spin_lock_bh(&np->np_thread_lock); 314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 315 spin_unlock_bh(&np->np_thread_lock); 316 continue; 317 } 318 319 match = iscsit_check_np_match(sockaddr, np, network_transport); 320 if (match) { 321 /* 322 * Increment the np_exports reference count now to 323 * prevent iscsit_del_np() below from being called 324 * while iscsi_tpg_add_network_portal() is called. 325 */ 326 np->np_exports++; 327 spin_unlock_bh(&np->np_thread_lock); 328 return np; 329 } 330 spin_unlock_bh(&np->np_thread_lock); 331 } 332 333 return NULL; 334 } 335 336 struct iscsi_np *iscsit_add_np( 337 struct sockaddr_storage *sockaddr, 338 int network_transport) 339 { 340 struct iscsi_np *np; 341 int ret; 342 343 mutex_lock(&np_lock); 344 345 /* 346 * Locate the existing struct iscsi_np if already active.. 347 */ 348 np = iscsit_get_np(sockaddr, network_transport); 349 if (np) { 350 mutex_unlock(&np_lock); 351 return np; 352 } 353 354 np = kzalloc(sizeof(*np), GFP_KERNEL); 355 if (!np) { 356 mutex_unlock(&np_lock); 357 return ERR_PTR(-ENOMEM); 358 } 359 360 np->np_flags |= NPF_IP_NETWORK; 361 np->np_network_transport = network_transport; 362 spin_lock_init(&np->np_thread_lock); 363 init_completion(&np->np_restart_comp); 364 INIT_LIST_HEAD(&np->np_list); 365 366 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0); 367 368 ret = iscsi_target_setup_login_socket(np, sockaddr); 369 if (ret != 0) { 370 kfree(np); 371 mutex_unlock(&np_lock); 372 return ERR_PTR(ret); 373 } 374 375 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 376 if (IS_ERR(np->np_thread)) { 377 pr_err("Unable to create kthread: iscsi_np\n"); 378 ret = PTR_ERR(np->np_thread); 379 kfree(np); 380 mutex_unlock(&np_lock); 381 return ERR_PTR(ret); 382 } 383 /* 384 * Increment the np_exports reference count now to prevent 385 * iscsit_del_np() below from being run while a new call to 386 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 387 * active. We don't need to hold np->np_thread_lock at this 388 * point because iscsi_np has not been added to g_np_list yet. 389 */ 390 np->np_exports = 1; 391 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 392 393 list_add_tail(&np->np_list, &g_np_list); 394 mutex_unlock(&np_lock); 395 396 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 397 &np->np_sockaddr, np->np_transport->name); 398 399 return np; 400 } 401 402 int iscsit_reset_np_thread( 403 struct iscsi_np *np, 404 struct iscsi_tpg_np *tpg_np, 405 struct iscsi_portal_group *tpg, 406 bool shutdown) 407 { 408 spin_lock_bh(&np->np_thread_lock); 409 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 410 spin_unlock_bh(&np->np_thread_lock); 411 return 0; 412 } 413 np->np_thread_state = ISCSI_NP_THREAD_RESET; 414 atomic_inc(&np->np_reset_count); 415 416 if (np->np_thread) { 417 spin_unlock_bh(&np->np_thread_lock); 418 send_sig(SIGINT, np->np_thread, 1); 419 wait_for_completion(&np->np_restart_comp); 420 spin_lock_bh(&np->np_thread_lock); 421 } 422 spin_unlock_bh(&np->np_thread_lock); 423 424 if (tpg_np && shutdown) { 425 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 426 427 wait_for_completion(&tpg_np->tpg_np_comp); 428 } 429 430 return 0; 431 } 432 433 static void iscsit_free_np(struct iscsi_np *np) 434 { 435 if (np->np_socket) 436 sock_release(np->np_socket); 437 } 438 439 int iscsit_del_np(struct iscsi_np *np) 440 { 441 spin_lock_bh(&np->np_thread_lock); 442 np->np_exports--; 443 if (np->np_exports) { 444 np->enabled = true; 445 spin_unlock_bh(&np->np_thread_lock); 446 return 0; 447 } 448 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 449 spin_unlock_bh(&np->np_thread_lock); 450 451 if (np->np_thread) { 452 /* 453 * We need to send the signal to wakeup Linux/Net 454 * which may be sleeping in sock_accept().. 455 */ 456 send_sig(SIGINT, np->np_thread, 1); 457 kthread_stop(np->np_thread); 458 np->np_thread = NULL; 459 } 460 461 np->np_transport->iscsit_free_np(np); 462 463 mutex_lock(&np_lock); 464 list_del(&np->np_list); 465 mutex_unlock(&np_lock); 466 467 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 468 &np->np_sockaddr, np->np_transport->name); 469 470 iscsit_put_transport(np->np_transport); 471 kfree(np); 472 return 0; 473 } 474 475 static void iscsit_get_rx_pdu(struct iscsit_conn *); 476 477 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 478 { 479 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 480 } 481 EXPORT_SYMBOL(iscsit_queue_rsp); 482 483 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 484 { 485 spin_lock_bh(&conn->cmd_lock); 486 if (!list_empty(&cmd->i_conn_node)) 487 list_del_init(&cmd->i_conn_node); 488 spin_unlock_bh(&conn->cmd_lock); 489 490 __iscsit_free_cmd(cmd, true); 491 } 492 EXPORT_SYMBOL(iscsit_aborted_task); 493 494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 495 u32, u32, const void *, void *); 496 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *); 497 498 static int 499 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 500 const void *data_buf, u32 data_buf_len) 501 { 502 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 503 struct kvec *iov; 504 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 505 int ret; 506 507 iov = &cmd->iov_misc[0]; 508 iov[niov].iov_base = cmd->pdu; 509 iov[niov++].iov_len = ISCSI_HDR_LEN; 510 511 if (conn->conn_ops->HeaderDigest) { 512 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 513 514 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 515 ISCSI_HDR_LEN, 0, NULL, 516 header_digest); 517 518 iov[0].iov_len += ISCSI_CRC_LEN; 519 tx_size += ISCSI_CRC_LEN; 520 pr_debug("Attaching CRC32C HeaderDigest" 521 " to opcode 0x%x 0x%08x\n", 522 hdr->opcode, *header_digest); 523 } 524 525 if (data_buf_len) { 526 u32 padding = ((-data_buf_len) & 3); 527 528 iov[niov].iov_base = (void *)data_buf; 529 iov[niov++].iov_len = data_buf_len; 530 tx_size += data_buf_len; 531 532 if (padding != 0) { 533 iov[niov].iov_base = &cmd->pad_bytes; 534 iov[niov++].iov_len = padding; 535 tx_size += padding; 536 pr_debug("Attaching %u additional" 537 " padding bytes.\n", padding); 538 } 539 540 if (conn->conn_ops->DataDigest) { 541 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 542 data_buf, data_buf_len, 543 padding, &cmd->pad_bytes, 544 &cmd->data_crc); 545 546 iov[niov].iov_base = &cmd->data_crc; 547 iov[niov++].iov_len = ISCSI_CRC_LEN; 548 tx_size += ISCSI_CRC_LEN; 549 pr_debug("Attached DataDigest for %u" 550 " bytes opcode 0x%x, CRC 0x%08x\n", 551 data_buf_len, hdr->opcode, cmd->data_crc); 552 } 553 } 554 555 cmd->iov_misc_count = niov; 556 cmd->tx_size = tx_size; 557 558 ret = iscsit_send_tx_data(cmd, conn, 1); 559 if (ret < 0) { 560 iscsit_tx_thread_wait_for_tcp(conn); 561 return ret; 562 } 563 564 return 0; 565 } 566 567 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 568 u32 data_offset, u32 data_length); 569 static void iscsit_unmap_iovec(struct iscsit_cmd *); 570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *, 571 u32, u32, u32, u8 *); 572 static int 573 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 574 const struct iscsi_datain *datain) 575 { 576 struct kvec *iov; 577 u32 iov_count = 0, tx_size = 0; 578 int ret, iov_ret; 579 580 iov = &cmd->iov_data[0]; 581 iov[iov_count].iov_base = cmd->pdu; 582 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 583 tx_size += ISCSI_HDR_LEN; 584 585 if (conn->conn_ops->HeaderDigest) { 586 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 587 588 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 589 ISCSI_HDR_LEN, 0, NULL, 590 header_digest); 591 592 iov[0].iov_len += ISCSI_CRC_LEN; 593 tx_size += ISCSI_CRC_LEN; 594 595 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 596 *header_digest); 597 } 598 599 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count], 600 cmd->orig_iov_data_count - (iov_count + 2), 601 datain->offset, datain->length); 602 if (iov_ret < 0) 603 return -1; 604 605 iov_count += iov_ret; 606 tx_size += datain->length; 607 608 cmd->padding = ((-datain->length) & 3); 609 if (cmd->padding) { 610 iov[iov_count].iov_base = cmd->pad_bytes; 611 iov[iov_count++].iov_len = cmd->padding; 612 tx_size += cmd->padding; 613 614 pr_debug("Attaching %u padding bytes\n", cmd->padding); 615 } 616 617 if (conn->conn_ops->DataDigest) { 618 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 619 cmd, datain->offset, 620 datain->length, 621 cmd->padding, 622 cmd->pad_bytes); 623 624 iov[iov_count].iov_base = &cmd->data_crc; 625 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 626 tx_size += ISCSI_CRC_LEN; 627 628 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 629 datain->length + cmd->padding, cmd->data_crc); 630 } 631 632 cmd->iov_data_count = iov_count; 633 cmd->tx_size = tx_size; 634 635 ret = iscsit_fe_sendpage_sg(cmd, conn); 636 637 iscsit_unmap_iovec(cmd); 638 639 if (ret < 0) { 640 iscsit_tx_thread_wait_for_tcp(conn); 641 return ret; 642 } 643 644 return 0; 645 } 646 647 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 648 struct iscsi_datain_req *dr, const void *buf, 649 u32 buf_len) 650 { 651 if (dr) 652 return iscsit_xmit_datain_pdu(conn, cmd, buf); 653 else 654 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 655 } 656 657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn) 658 { 659 return TARGET_PROT_NORMAL; 660 } 661 662 static struct iscsit_transport iscsi_target_transport = { 663 .name = "iSCSI/TCP", 664 .transport_type = ISCSI_TCP, 665 .rdma_shutdown = false, 666 .owner = NULL, 667 .iscsit_setup_np = iscsit_setup_np, 668 .iscsit_accept_np = iscsit_accept_np, 669 .iscsit_free_np = iscsit_free_np, 670 .iscsit_get_login_rx = iscsit_get_login_rx, 671 .iscsit_put_login_tx = iscsit_put_login_tx, 672 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 673 .iscsit_immediate_queue = iscsit_immediate_queue, 674 .iscsit_response_queue = iscsit_response_queue, 675 .iscsit_queue_data_in = iscsit_queue_rsp, 676 .iscsit_queue_status = iscsit_queue_rsp, 677 .iscsit_aborted_task = iscsit_aborted_task, 678 .iscsit_xmit_pdu = iscsit_xmit_pdu, 679 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 680 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 681 }; 682 683 static int __init iscsi_target_init_module(void) 684 { 685 int ret = 0, size; 686 687 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 688 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 689 if (!iscsit_global) 690 return -1; 691 692 spin_lock_init(&iscsit_global->ts_bitmap_lock); 693 mutex_init(&auth_id_lock); 694 idr_init(&tiqn_idr); 695 696 ret = target_register_template(&iscsi_ops); 697 if (ret) 698 goto out; 699 700 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 701 iscsit_global->ts_bitmap = vzalloc(size); 702 if (!iscsit_global->ts_bitmap) 703 goto configfs_out; 704 705 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) { 706 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n"); 707 goto bitmap_out; 708 } 709 cpumask_setall(iscsit_global->allowed_cpumask); 710 711 lio_qr_cache = kmem_cache_create("lio_qr_cache", 712 sizeof(struct iscsi_queue_req), 713 __alignof__(struct iscsi_queue_req), 0, NULL); 714 if (!lio_qr_cache) { 715 pr_err("Unable to kmem_cache_create() for" 716 " lio_qr_cache\n"); 717 goto cpumask_out; 718 } 719 720 lio_dr_cache = kmem_cache_create("lio_dr_cache", 721 sizeof(struct iscsi_datain_req), 722 __alignof__(struct iscsi_datain_req), 0, NULL); 723 if (!lio_dr_cache) { 724 pr_err("Unable to kmem_cache_create() for" 725 " lio_dr_cache\n"); 726 goto qr_out; 727 } 728 729 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 730 sizeof(struct iscsi_ooo_cmdsn), 731 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 732 if (!lio_ooo_cache) { 733 pr_err("Unable to kmem_cache_create() for" 734 " lio_ooo_cache\n"); 735 goto dr_out; 736 } 737 738 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 739 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 740 0, NULL); 741 if (!lio_r2t_cache) { 742 pr_err("Unable to kmem_cache_create() for" 743 " lio_r2t_cache\n"); 744 goto ooo_out; 745 } 746 747 iscsit_register_transport(&iscsi_target_transport); 748 749 if (iscsit_load_discovery_tpg() < 0) 750 goto r2t_out; 751 752 return ret; 753 r2t_out: 754 iscsit_unregister_transport(&iscsi_target_transport); 755 kmem_cache_destroy(lio_r2t_cache); 756 ooo_out: 757 kmem_cache_destroy(lio_ooo_cache); 758 dr_out: 759 kmem_cache_destroy(lio_dr_cache); 760 qr_out: 761 kmem_cache_destroy(lio_qr_cache); 762 cpumask_out: 763 free_cpumask_var(iscsit_global->allowed_cpumask); 764 bitmap_out: 765 vfree(iscsit_global->ts_bitmap); 766 configfs_out: 767 /* XXX: this probably wants it to be it's own unwind step.. */ 768 if (iscsit_global->discovery_tpg) 769 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 770 target_unregister_template(&iscsi_ops); 771 out: 772 kfree(iscsit_global); 773 return -ENOMEM; 774 } 775 776 static void __exit iscsi_target_cleanup_module(void) 777 { 778 iscsit_release_discovery_tpg(); 779 iscsit_unregister_transport(&iscsi_target_transport); 780 kmem_cache_destroy(lio_qr_cache); 781 kmem_cache_destroy(lio_dr_cache); 782 kmem_cache_destroy(lio_ooo_cache); 783 kmem_cache_destroy(lio_r2t_cache); 784 785 /* 786 * Shutdown discovery sessions and disable discovery TPG 787 */ 788 if (iscsit_global->discovery_tpg) 789 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 790 791 target_unregister_template(&iscsi_ops); 792 793 free_cpumask_var(iscsit_global->allowed_cpumask); 794 vfree(iscsit_global->ts_bitmap); 795 kfree(iscsit_global); 796 } 797 798 int iscsit_add_reject( 799 struct iscsit_conn *conn, 800 u8 reason, 801 unsigned char *buf) 802 { 803 struct iscsit_cmd *cmd; 804 805 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 806 if (!cmd) 807 return -1; 808 809 cmd->iscsi_opcode = ISCSI_OP_REJECT; 810 cmd->reject_reason = reason; 811 812 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 813 if (!cmd->buf_ptr) { 814 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 815 iscsit_free_cmd(cmd, false); 816 return -1; 817 } 818 819 spin_lock_bh(&conn->cmd_lock); 820 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 821 spin_unlock_bh(&conn->cmd_lock); 822 823 cmd->i_state = ISTATE_SEND_REJECT; 824 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 825 826 return -1; 827 } 828 EXPORT_SYMBOL(iscsit_add_reject); 829 830 static int iscsit_add_reject_from_cmd( 831 struct iscsit_cmd *cmd, 832 u8 reason, 833 bool add_to_conn, 834 unsigned char *buf) 835 { 836 struct iscsit_conn *conn; 837 const bool do_put = cmd->se_cmd.se_tfo != NULL; 838 839 if (!cmd->conn) { 840 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 841 cmd->init_task_tag); 842 return -1; 843 } 844 conn = cmd->conn; 845 846 cmd->iscsi_opcode = ISCSI_OP_REJECT; 847 cmd->reject_reason = reason; 848 849 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 850 if (!cmd->buf_ptr) { 851 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 852 iscsit_free_cmd(cmd, false); 853 return -1; 854 } 855 856 if (add_to_conn) { 857 spin_lock_bh(&conn->cmd_lock); 858 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 859 spin_unlock_bh(&conn->cmd_lock); 860 } 861 862 cmd->i_state = ISTATE_SEND_REJECT; 863 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 864 /* 865 * Perform the kref_put now if se_cmd has already been setup by 866 * scsit_setup_scsi_cmd() 867 */ 868 if (do_put) { 869 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 870 target_put_sess_cmd(&cmd->se_cmd); 871 } 872 return -1; 873 } 874 875 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason, 876 unsigned char *buf) 877 { 878 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 879 } 880 881 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf) 882 { 883 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 884 } 885 EXPORT_SYMBOL(iscsit_reject_cmd); 886 887 /* 888 * Map some portion of the allocated scatterlist to an iovec, suitable for 889 * kernel sockets to copy data in/out. 890 */ 891 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 892 u32 data_offset, u32 data_length) 893 { 894 u32 i = 0, orig_data_length = data_length; 895 struct scatterlist *sg; 896 unsigned int page_off; 897 898 /* 899 * We know each entry in t_data_sg contains a page. 900 */ 901 u32 ent = data_offset / PAGE_SIZE; 902 903 if (!data_length) 904 return 0; 905 906 if (ent >= cmd->se_cmd.t_data_nents) { 907 pr_err("Initial page entry out-of-bounds\n"); 908 goto overflow; 909 } 910 911 sg = &cmd->se_cmd.t_data_sg[ent]; 912 page_off = (data_offset % PAGE_SIZE); 913 914 cmd->first_data_sg = sg; 915 cmd->first_data_sg_off = page_off; 916 917 while (data_length) { 918 u32 cur_len; 919 920 if (WARN_ON_ONCE(!sg || i >= nvec)) 921 goto overflow; 922 923 cur_len = min_t(u32, data_length, sg->length - page_off); 924 925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 926 iov[i].iov_len = cur_len; 927 928 data_length -= cur_len; 929 page_off = 0; 930 sg = sg_next(sg); 931 i++; 932 } 933 934 cmd->kmapped_nents = i; 935 936 return i; 937 938 overflow: 939 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n", 940 data_offset, orig_data_length, i, nvec); 941 for_each_sg(cmd->se_cmd.t_data_sg, sg, 942 cmd->se_cmd.t_data_nents, i) { 943 pr_err("[%d] off %d len %d\n", 944 i, sg->offset, sg->length); 945 } 946 return -1; 947 } 948 949 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd) 950 { 951 u32 i; 952 struct scatterlist *sg; 953 954 sg = cmd->first_data_sg; 955 956 for (i = 0; i < cmd->kmapped_nents; i++) 957 kunmap(sg_page(&sg[i])); 958 } 959 960 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn) 961 { 962 LIST_HEAD(ack_list); 963 struct iscsit_cmd *cmd, *cmd_p; 964 965 conn->exp_statsn = exp_statsn; 966 967 if (conn->sess->sess_ops->RDMAExtensions) 968 return; 969 970 spin_lock_bh(&conn->cmd_lock); 971 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 972 spin_lock(&cmd->istate_lock); 973 if ((cmd->i_state == ISTATE_SENT_STATUS) && 974 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 975 cmd->i_state = ISTATE_REMOVE; 976 spin_unlock(&cmd->istate_lock); 977 list_move_tail(&cmd->i_conn_node, &ack_list); 978 continue; 979 } 980 spin_unlock(&cmd->istate_lock); 981 } 982 spin_unlock_bh(&conn->cmd_lock); 983 984 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 985 list_del_init(&cmd->i_conn_node); 986 iscsit_free_cmd(cmd, false); 987 } 988 } 989 990 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd) 991 { 992 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 993 994 iov_count += ISCSI_IOV_DATA_BUFFER; 995 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 996 if (!cmd->iov_data) 997 return -ENOMEM; 998 999 cmd->orig_iov_data_count = iov_count; 1000 return 0; 1001 } 1002 1003 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1004 unsigned char *buf) 1005 { 1006 int data_direction, payload_length; 1007 struct iscsi_scsi_req *hdr; 1008 int iscsi_task_attr; 1009 int sam_task_attr; 1010 1011 atomic_long_inc(&conn->sess->cmd_pdus); 1012 1013 hdr = (struct iscsi_scsi_req *) buf; 1014 payload_length = ntoh24(hdr->dlength); 1015 1016 /* FIXME; Add checks for AdditionalHeaderSegment */ 1017 1018 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1019 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1020 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1021 " not set. Bad iSCSI Initiator.\n"); 1022 return iscsit_add_reject_cmd(cmd, 1023 ISCSI_REASON_BOOKMARK_INVALID, buf); 1024 } 1025 1026 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1027 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1028 /* 1029 * From RFC-3720 Section 10.3.1: 1030 * 1031 * "Either or both of R and W MAY be 1 when either the 1032 * Expected Data Transfer Length and/or Bidirectional Read 1033 * Expected Data Transfer Length are 0" 1034 * 1035 * For this case, go ahead and clear the unnecssary bits 1036 * to avoid any confusion with ->data_direction. 1037 */ 1038 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1039 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1040 1041 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1042 " set when Expected Data Transfer Length is 0 for" 1043 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1044 } 1045 1046 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1047 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1048 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1049 " MUST be set if Expected Data Transfer Length is not 0." 1050 " Bad iSCSI Initiator\n"); 1051 return iscsit_add_reject_cmd(cmd, 1052 ISCSI_REASON_BOOKMARK_INVALID, buf); 1053 } 1054 1055 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1056 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1057 pr_err("Bidirectional operations not supported!\n"); 1058 return iscsit_add_reject_cmd(cmd, 1059 ISCSI_REASON_BOOKMARK_INVALID, buf); 1060 } 1061 1062 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1063 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1064 " Scsi Command PDU.\n"); 1065 return iscsit_add_reject_cmd(cmd, 1066 ISCSI_REASON_BOOKMARK_INVALID, buf); 1067 } 1068 1069 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1070 pr_err("ImmediateData=No but DataSegmentLength=%u," 1071 " protocol error.\n", payload_length); 1072 return iscsit_add_reject_cmd(cmd, 1073 ISCSI_REASON_PROTOCOL_ERROR, buf); 1074 } 1075 1076 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1077 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1078 pr_err("Expected Data Transfer Length and Length of" 1079 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1080 " bit is not set protocol error\n"); 1081 return iscsit_add_reject_cmd(cmd, 1082 ISCSI_REASON_PROTOCOL_ERROR, buf); 1083 } 1084 1085 if (payload_length > be32_to_cpu(hdr->data_length)) { 1086 pr_err("DataSegmentLength: %u is greater than" 1087 " EDTL: %u, protocol error.\n", payload_length, 1088 hdr->data_length); 1089 return iscsit_add_reject_cmd(cmd, 1090 ISCSI_REASON_PROTOCOL_ERROR, buf); 1091 } 1092 1093 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1094 pr_err("DataSegmentLength: %u is greater than" 1095 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1096 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1097 return iscsit_add_reject_cmd(cmd, 1098 ISCSI_REASON_PROTOCOL_ERROR, buf); 1099 } 1100 1101 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1102 pr_err("DataSegmentLength: %u is greater than" 1103 " FirstBurstLength: %u, protocol error.\n", 1104 payload_length, conn->sess->sess_ops->FirstBurstLength); 1105 return iscsit_add_reject_cmd(cmd, 1106 ISCSI_REASON_BOOKMARK_INVALID, buf); 1107 } 1108 1109 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1110 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1111 DMA_NONE; 1112 1113 cmd->data_direction = data_direction; 1114 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1115 /* 1116 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1117 */ 1118 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1119 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1120 sam_task_attr = TCM_SIMPLE_TAG; 1121 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1122 sam_task_attr = TCM_ORDERED_TAG; 1123 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1124 sam_task_attr = TCM_HEAD_TAG; 1125 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1126 sam_task_attr = TCM_ACA_TAG; 1127 else { 1128 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1129 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1130 sam_task_attr = TCM_SIMPLE_TAG; 1131 } 1132 1133 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1134 cmd->i_state = ISTATE_NEW_CMD; 1135 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1136 cmd->immediate_data = (payload_length) ? 1 : 0; 1137 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1138 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1139 if (cmd->unsolicited_data) 1140 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1141 1142 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1143 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1144 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1145 else 1146 cmd->targ_xfer_tag = 0xFFFFFFFF; 1147 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1148 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1149 cmd->first_burst_len = payload_length; 1150 1151 if (!conn->sess->sess_ops->RDMAExtensions && 1152 cmd->data_direction == DMA_FROM_DEVICE) { 1153 struct iscsi_datain_req *dr; 1154 1155 dr = iscsit_allocate_datain_req(); 1156 if (!dr) 1157 return iscsit_add_reject_cmd(cmd, 1158 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1159 1160 iscsit_attach_datain_req(cmd, dr); 1161 } 1162 1163 /* 1164 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1165 */ 1166 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 1167 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1168 cmd->data_direction, sam_task_attr, 1169 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun)); 1170 1171 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1172 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1173 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1174 conn->cid); 1175 1176 target_get_sess_cmd(&cmd->se_cmd, true); 1177 1178 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1179 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb, 1180 GFP_KERNEL); 1181 1182 if (cmd->sense_reason) { 1183 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1184 return iscsit_add_reject_cmd(cmd, 1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1186 } 1187 1188 goto attach_cmd; 1189 } 1190 1191 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd); 1192 if (cmd->sense_reason) 1193 goto attach_cmd; 1194 1195 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd); 1196 if (cmd->sense_reason) 1197 goto attach_cmd; 1198 1199 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1200 return iscsit_add_reject_cmd(cmd, 1201 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1202 } 1203 1204 attach_cmd: 1205 spin_lock_bh(&conn->cmd_lock); 1206 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1207 spin_unlock_bh(&conn->cmd_lock); 1208 /* 1209 * Check if we need to delay processing because of ALUA 1210 * Active/NonOptimized primary access state.. 1211 */ 1212 core_alua_check_nonop_delay(&cmd->se_cmd); 1213 1214 return 0; 1215 } 1216 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1217 1218 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd) 1219 { 1220 iscsit_set_dataout_sequence_values(cmd); 1221 1222 spin_lock_bh(&cmd->dataout_timeout_lock); 1223 iscsit_start_dataout_timer(cmd, cmd->conn); 1224 spin_unlock_bh(&cmd->dataout_timeout_lock); 1225 } 1226 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); 1227 1228 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1229 struct iscsi_scsi_req *hdr) 1230 { 1231 int cmdsn_ret = 0; 1232 /* 1233 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1234 * the Immediate Bit is not set, and no Immediate 1235 * Data is attached. 1236 * 1237 * A PDU/CmdSN carrying Immediate Data can only 1238 * be processed after the DataCRC has passed. 1239 * If the DataCRC fails, the CmdSN MUST NOT 1240 * be acknowledged. (See below) 1241 */ 1242 if (!cmd->immediate_data) { 1243 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1244 (unsigned char *)hdr, hdr->cmdsn); 1245 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1246 return -1; 1247 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1248 target_put_sess_cmd(&cmd->se_cmd); 1249 return 0; 1250 } 1251 } 1252 1253 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1254 1255 /* 1256 * If no Immediate Data is attached, it's OK to return now. 1257 */ 1258 if (!cmd->immediate_data) { 1259 if (!cmd->sense_reason && cmd->unsolicited_data) 1260 iscsit_set_unsolicited_dataout(cmd); 1261 if (!cmd->sense_reason) 1262 return 0; 1263 1264 target_put_sess_cmd(&cmd->se_cmd); 1265 return 0; 1266 } 1267 1268 /* 1269 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1270 * execution. These exceptions are processed in CmdSN order using 1271 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1272 */ 1273 if (cmd->sense_reason) 1274 return 1; 1275 /* 1276 * Call directly into transport_generic_new_cmd() to perform 1277 * the backend memory allocation. 1278 */ 1279 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1280 if (cmd->sense_reason) 1281 return 1; 1282 1283 return 0; 1284 } 1285 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1286 1287 static int 1288 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr, 1289 bool dump_payload) 1290 { 1291 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1292 int rc; 1293 1294 /* 1295 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1296 */ 1297 if (dump_payload) { 1298 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, 1299 cmd->first_burst_len); 1300 1301 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", 1302 cmd->se_cmd.data_length, cmd->write_data_done, 1303 cmd->first_burst_len, length); 1304 rc = iscsit_dump_data_payload(cmd->conn, length, 1); 1305 pr_debug("Finished dumping immediate data\n"); 1306 if (rc < 0) 1307 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; 1308 } else { 1309 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1310 cmd->first_burst_len); 1311 } 1312 1313 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1314 /* 1315 * A PDU/CmdSN carrying Immediate Data passed 1316 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1317 * Immediate Bit is not set. 1318 */ 1319 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1320 (unsigned char *)hdr, hdr->cmdsn); 1321 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1322 return -1; 1323 1324 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1325 target_put_sess_cmd(&cmd->se_cmd); 1326 1327 return 0; 1328 } else if (cmd->unsolicited_data) 1329 iscsit_set_unsolicited_dataout(cmd); 1330 1331 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1332 /* 1333 * Immediate Data failed DataCRC and ERL>=1, 1334 * silently drop this PDU and let the initiator 1335 * plug the CmdSN gap. 1336 * 1337 * FIXME: Send Unsolicited NOPIN with reserved 1338 * TTT here to help the initiator figure out 1339 * the missing CmdSN, although they should be 1340 * intelligent enough to determine the missing 1341 * CmdSN and issue a retry to plug the sequence. 1342 */ 1343 cmd->i_state = ISTATE_REMOVE; 1344 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1345 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1346 return -1; 1347 1348 return 0; 1349 } 1350 1351 static int 1352 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1353 unsigned char *buf) 1354 { 1355 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1356 int rc, immed_data; 1357 bool dump_payload = false; 1358 1359 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1360 if (rc < 0) 1361 return 0; 1362 /* 1363 * Allocation iovecs needed for struct socket operations for 1364 * traditional iSCSI block I/O. 1365 */ 1366 if (iscsit_allocate_iovecs(cmd) < 0) { 1367 return iscsit_reject_cmd(cmd, 1368 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1369 } 1370 immed_data = cmd->immediate_data; 1371 1372 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1373 if (rc < 0) 1374 return rc; 1375 else if (rc > 0) 1376 dump_payload = true; 1377 1378 if (!immed_data) 1379 return 0; 1380 1381 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1382 } 1383 1384 static u32 iscsit_do_crypto_hash_sg( 1385 struct ahash_request *hash, 1386 struct iscsit_cmd *cmd, 1387 u32 data_offset, 1388 u32 data_length, 1389 u32 padding, 1390 u8 *pad_bytes) 1391 { 1392 u32 data_crc; 1393 struct scatterlist *sg; 1394 unsigned int page_off; 1395 1396 crypto_ahash_init(hash); 1397 1398 sg = cmd->first_data_sg; 1399 page_off = cmd->first_data_sg_off; 1400 1401 if (data_length && page_off) { 1402 struct scatterlist first_sg; 1403 u32 len = min_t(u32, data_length, sg->length - page_off); 1404 1405 sg_init_table(&first_sg, 1); 1406 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off); 1407 1408 ahash_request_set_crypt(hash, &first_sg, NULL, len); 1409 crypto_ahash_update(hash); 1410 1411 data_length -= len; 1412 sg = sg_next(sg); 1413 } 1414 1415 while (data_length) { 1416 u32 cur_len = min_t(u32, data_length, sg->length); 1417 1418 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1419 crypto_ahash_update(hash); 1420 1421 data_length -= cur_len; 1422 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1423 sg = sg_next(sg); 1424 } 1425 1426 if (padding) { 1427 struct scatterlist pad_sg; 1428 1429 sg_init_one(&pad_sg, pad_bytes, padding); 1430 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1431 padding); 1432 crypto_ahash_finup(hash); 1433 } else { 1434 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1435 crypto_ahash_final(hash); 1436 } 1437 1438 return data_crc; 1439 } 1440 1441 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1442 const void *buf, u32 payload_length, u32 padding, 1443 const void *pad_bytes, void *data_crc) 1444 { 1445 struct scatterlist sg[2]; 1446 1447 sg_init_table(sg, ARRAY_SIZE(sg)); 1448 sg_set_buf(sg, buf, payload_length); 1449 if (padding) 1450 sg_set_buf(sg + 1, pad_bytes, padding); 1451 1452 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1453 1454 crypto_ahash_digest(hash); 1455 } 1456 1457 int 1458 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1459 struct iscsit_cmd *cmd, u32 payload_length, 1460 bool *success) 1461 { 1462 struct iscsi_data *hdr = buf; 1463 struct se_cmd *se_cmd; 1464 int rc; 1465 1466 /* iSCSI write */ 1467 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1468 1469 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1470 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1471 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1472 payload_length, conn->cid); 1473 1474 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1475 pr_err("Command ITT: 0x%08x received DataOUT after" 1476 " last DataOUT received, dumping payload\n", 1477 cmd->init_task_tag); 1478 return iscsit_dump_data_payload(conn, payload_length, 1); 1479 } 1480 1481 if (cmd->data_direction != DMA_TO_DEVICE) { 1482 pr_err("Command ITT: 0x%08x received DataOUT for a" 1483 " NON-WRITE command.\n", cmd->init_task_tag); 1484 return iscsit_dump_data_payload(conn, payload_length, 1); 1485 } 1486 se_cmd = &cmd->se_cmd; 1487 iscsit_mod_dataout_timer(cmd); 1488 1489 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1490 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1491 be32_to_cpu(hdr->offset), payload_length, 1492 cmd->se_cmd.data_length); 1493 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1494 } 1495 1496 if (cmd->unsolicited_data) { 1497 int dump_unsolicited_data = 0; 1498 1499 if (conn->sess->sess_ops->InitialR2T) { 1500 pr_err("Received unexpected unsolicited data" 1501 " while InitialR2T=Yes, protocol error.\n"); 1502 transport_send_check_condition_and_sense(&cmd->se_cmd, 1503 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1504 return -1; 1505 } 1506 /* 1507 * Special case for dealing with Unsolicited DataOUT 1508 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1509 * failures; 1510 */ 1511 1512 /* Something's amiss if we're not in WRITE_PENDING state... */ 1513 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1514 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1515 dump_unsolicited_data = 1; 1516 1517 if (dump_unsolicited_data) { 1518 /* 1519 * Check if a delayed TASK_ABORTED status needs to 1520 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1521 * received with the unsolicited data out. 1522 */ 1523 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1524 iscsit_stop_dataout_timer(cmd); 1525 1526 return iscsit_dump_data_payload(conn, payload_length, 1); 1527 } 1528 } else { 1529 /* 1530 * For the normal solicited data path: 1531 * 1532 * Check for a delayed TASK_ABORTED status and dump any 1533 * incoming data out payload if one exists. Also, when the 1534 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1535 * data out sequence, we decrement outstanding_r2ts. Once 1536 * outstanding_r2ts reaches zero, go ahead and send the delayed 1537 * TASK_ABORTED status. 1538 */ 1539 if (se_cmd->transport_state & CMD_T_ABORTED) { 1540 if (hdr->flags & ISCSI_FLAG_CMD_FINAL && 1541 --cmd->outstanding_r2ts < 1) 1542 iscsit_stop_dataout_timer(cmd); 1543 1544 return iscsit_dump_data_payload(conn, payload_length, 1); 1545 } 1546 } 1547 /* 1548 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1549 * within-command recovery checks before receiving the payload. 1550 */ 1551 rc = iscsit_check_pre_dataout(cmd, buf); 1552 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1553 return 0; 1554 else if (rc == DATAOUT_CANNOT_RECOVER) 1555 return -1; 1556 *success = true; 1557 return 0; 1558 } 1559 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1560 1561 int 1562 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1563 struct iscsit_cmd **out_cmd) 1564 { 1565 struct iscsi_data *hdr = buf; 1566 struct iscsit_cmd *cmd; 1567 u32 payload_length = ntoh24(hdr->dlength); 1568 int rc; 1569 bool success = false; 1570 1571 if (!payload_length) { 1572 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1573 return 0; 1574 } 1575 1576 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1577 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1578 " MaxXmitDataSegmentLength: %u\n", payload_length, 1579 conn->conn_ops->MaxXmitDataSegmentLength); 1580 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1581 } 1582 1583 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1584 if (!cmd) 1585 return 0; 1586 1587 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1588 1589 if (success) 1590 *out_cmd = cmd; 1591 1592 return rc; 1593 } 1594 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1595 1596 static int 1597 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1598 struct iscsi_data *hdr) 1599 { 1600 struct kvec *iov; 1601 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1602 u32 payload_length; 1603 int iov_ret, data_crc_failed = 0; 1604 1605 payload_length = min_t(u32, cmd->se_cmd.data_length, 1606 ntoh24(hdr->dlength)); 1607 rx_size += payload_length; 1608 iov = &cmd->iov_data[0]; 1609 1610 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, 1611 be32_to_cpu(hdr->offset), payload_length); 1612 if (iov_ret < 0) 1613 return -1; 1614 1615 iov_count += iov_ret; 1616 1617 padding = ((-payload_length) & 3); 1618 if (padding != 0) { 1619 iov[iov_count].iov_base = cmd->pad_bytes; 1620 iov[iov_count++].iov_len = padding; 1621 rx_size += padding; 1622 pr_debug("Receiving %u padding bytes.\n", padding); 1623 } 1624 1625 if (conn->conn_ops->DataDigest) { 1626 iov[iov_count].iov_base = &checksum; 1627 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1628 rx_size += ISCSI_CRC_LEN; 1629 } 1630 1631 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 1632 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1633 1634 iscsit_unmap_iovec(cmd); 1635 1636 if (rx_got != rx_size) 1637 return -1; 1638 1639 if (conn->conn_ops->DataDigest) { 1640 u32 data_crc; 1641 1642 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1643 be32_to_cpu(hdr->offset), 1644 payload_length, padding, 1645 cmd->pad_bytes); 1646 1647 if (checksum != data_crc) { 1648 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1649 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1650 " does not match computed 0x%08x\n", 1651 hdr->itt, hdr->offset, payload_length, 1652 hdr->datasn, checksum, data_crc); 1653 data_crc_failed = 1; 1654 } else { 1655 pr_debug("Got CRC32C DataDigest 0x%08x for" 1656 " %u bytes of Data Out\n", checksum, 1657 payload_length); 1658 } 1659 } 1660 1661 return data_crc_failed; 1662 } 1663 1664 int 1665 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr, 1666 bool data_crc_failed) 1667 { 1668 struct iscsit_conn *conn = cmd->conn; 1669 int rc, ooo_cmdsn; 1670 /* 1671 * Increment post receive data and CRC values or perform 1672 * within-command recovery. 1673 */ 1674 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1675 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1676 return 0; 1677 else if (rc == DATAOUT_SEND_R2T) { 1678 iscsit_set_dataout_sequence_values(cmd); 1679 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1680 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1681 /* 1682 * Handle extra special case for out of order 1683 * Unsolicited Data Out. 1684 */ 1685 spin_lock_bh(&cmd->istate_lock); 1686 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1687 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1688 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1689 spin_unlock_bh(&cmd->istate_lock); 1690 1691 iscsit_stop_dataout_timer(cmd); 1692 if (ooo_cmdsn) 1693 return 0; 1694 target_execute_cmd(&cmd->se_cmd); 1695 return 0; 1696 } else /* DATAOUT_CANNOT_RECOVER */ 1697 return -1; 1698 1699 return 0; 1700 } 1701 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1702 1703 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf) 1704 { 1705 struct iscsit_cmd *cmd = NULL; 1706 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1707 int rc; 1708 bool data_crc_failed = false; 1709 1710 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1711 if (rc < 0) 1712 return 0; 1713 else if (!cmd) 1714 return 0; 1715 1716 rc = iscsit_get_dataout(conn, cmd, hdr); 1717 if (rc < 0) 1718 return rc; 1719 else if (rc > 0) 1720 data_crc_failed = true; 1721 1722 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1723 } 1724 1725 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1726 struct iscsi_nopout *hdr) 1727 { 1728 u32 payload_length = ntoh24(hdr->dlength); 1729 1730 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1731 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1732 if (!cmd) 1733 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1734 (unsigned char *)hdr); 1735 1736 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1737 (unsigned char *)hdr); 1738 } 1739 1740 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1741 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1742 " not set, protocol error.\n"); 1743 if (!cmd) 1744 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1745 (unsigned char *)hdr); 1746 1747 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1748 (unsigned char *)hdr); 1749 } 1750 1751 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1752 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1753 " greater than MaxXmitDataSegmentLength: %u, protocol" 1754 " error.\n", payload_length, 1755 conn->conn_ops->MaxXmitDataSegmentLength); 1756 if (!cmd) 1757 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1758 (unsigned char *)hdr); 1759 1760 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1761 (unsigned char *)hdr); 1762 } 1763 1764 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1765 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1766 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1767 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1768 payload_length); 1769 /* 1770 * This is not a response to a Unsolicited NopIN, which means 1771 * it can either be a NOPOUT ping request (with a valid ITT), 1772 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1773 * Either way, make sure we allocate an struct iscsit_cmd, as both 1774 * can contain ping data. 1775 */ 1776 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1777 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1778 cmd->i_state = ISTATE_SEND_NOPIN; 1779 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1780 1 : 0); 1781 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1782 cmd->targ_xfer_tag = 0xFFFFFFFF; 1783 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1784 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1785 cmd->data_direction = DMA_NONE; 1786 } 1787 1788 return 0; 1789 } 1790 EXPORT_SYMBOL(iscsit_setup_nop_out); 1791 1792 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1793 struct iscsi_nopout *hdr) 1794 { 1795 struct iscsit_cmd *cmd_p = NULL; 1796 int cmdsn_ret = 0; 1797 /* 1798 * Initiator is expecting a NopIN ping reply.. 1799 */ 1800 if (hdr->itt != RESERVED_ITT) { 1801 if (!cmd) 1802 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1803 (unsigned char *)hdr); 1804 1805 spin_lock_bh(&conn->cmd_lock); 1806 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1807 spin_unlock_bh(&conn->cmd_lock); 1808 1809 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1810 1811 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1812 iscsit_add_cmd_to_response_queue(cmd, conn, 1813 cmd->i_state); 1814 return 0; 1815 } 1816 1817 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1818 (unsigned char *)hdr, hdr->cmdsn); 1819 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1820 return 0; 1821 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1822 return -1; 1823 1824 return 0; 1825 } 1826 /* 1827 * This was a response to a unsolicited NOPIN ping. 1828 */ 1829 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1830 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1831 if (!cmd_p) 1832 return -EINVAL; 1833 1834 iscsit_stop_nopin_response_timer(conn); 1835 1836 cmd_p->i_state = ISTATE_REMOVE; 1837 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1838 1839 iscsit_start_nopin_timer(conn); 1840 return 0; 1841 } 1842 /* 1843 * Otherwise, initiator is not expecting a NOPIN is response. 1844 * Just ignore for now. 1845 */ 1846 1847 if (cmd) 1848 iscsit_free_cmd(cmd, false); 1849 1850 return 0; 1851 } 1852 EXPORT_SYMBOL(iscsit_process_nop_out); 1853 1854 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1855 unsigned char *buf) 1856 { 1857 unsigned char *ping_data = NULL; 1858 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1859 struct kvec *iov = NULL; 1860 u32 payload_length = ntoh24(hdr->dlength); 1861 int ret; 1862 1863 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1864 if (ret < 0) 1865 return 0; 1866 /* 1867 * Handle NOP-OUT payload for traditional iSCSI sockets 1868 */ 1869 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1870 u32 checksum, data_crc, padding = 0; 1871 int niov = 0, rx_got, rx_size = payload_length; 1872 1873 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1874 if (!ping_data) { 1875 ret = -1; 1876 goto out; 1877 } 1878 1879 iov = &cmd->iov_misc[0]; 1880 iov[niov].iov_base = ping_data; 1881 iov[niov++].iov_len = payload_length; 1882 1883 padding = ((-payload_length) & 3); 1884 if (padding != 0) { 1885 pr_debug("Receiving %u additional bytes" 1886 " for padding.\n", padding); 1887 iov[niov].iov_base = &cmd->pad_bytes; 1888 iov[niov++].iov_len = padding; 1889 rx_size += padding; 1890 } 1891 if (conn->conn_ops->DataDigest) { 1892 iov[niov].iov_base = &checksum; 1893 iov[niov++].iov_len = ISCSI_CRC_LEN; 1894 rx_size += ISCSI_CRC_LEN; 1895 } 1896 1897 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); 1898 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1899 if (rx_got != rx_size) { 1900 ret = -1; 1901 goto out; 1902 } 1903 1904 if (conn->conn_ops->DataDigest) { 1905 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1906 payload_length, padding, 1907 cmd->pad_bytes, &data_crc); 1908 1909 if (checksum != data_crc) { 1910 pr_err("Ping data CRC32C DataDigest" 1911 " 0x%08x does not match computed 0x%08x\n", 1912 checksum, data_crc); 1913 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1914 pr_err("Unable to recover from" 1915 " NOPOUT Ping DataCRC failure while in" 1916 " ERL=0.\n"); 1917 ret = -1; 1918 goto out; 1919 } else { 1920 /* 1921 * Silently drop this PDU and let the 1922 * initiator plug the CmdSN gap. 1923 */ 1924 pr_debug("Dropping NOPOUT" 1925 " Command CmdSN: 0x%08x due to" 1926 " DataCRC error.\n", hdr->cmdsn); 1927 ret = 0; 1928 goto out; 1929 } 1930 } else { 1931 pr_debug("Got CRC32C DataDigest" 1932 " 0x%08x for %u bytes of ping data.\n", 1933 checksum, payload_length); 1934 } 1935 } 1936 1937 ping_data[payload_length] = '\0'; 1938 /* 1939 * Attach ping data to struct iscsit_cmd->buf_ptr. 1940 */ 1941 cmd->buf_ptr = ping_data; 1942 cmd->buf_ptr_size = payload_length; 1943 1944 pr_debug("Got %u bytes of NOPOUT ping" 1945 " data.\n", payload_length); 1946 pr_debug("Ping Data: \"%s\"\n", ping_data); 1947 } 1948 1949 return iscsit_process_nop_out(conn, cmd, hdr); 1950 out: 1951 if (cmd) 1952 iscsit_free_cmd(cmd, false); 1953 1954 kfree(ping_data); 1955 return ret; 1956 } 1957 1958 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1959 { 1960 switch (iscsi_tmf) { 1961 case ISCSI_TM_FUNC_ABORT_TASK: 1962 return TMR_ABORT_TASK; 1963 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1964 return TMR_ABORT_TASK_SET; 1965 case ISCSI_TM_FUNC_CLEAR_ACA: 1966 return TMR_CLEAR_ACA; 1967 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1968 return TMR_CLEAR_TASK_SET; 1969 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1970 return TMR_LUN_RESET; 1971 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1972 return TMR_TARGET_WARM_RESET; 1973 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1974 return TMR_TARGET_COLD_RESET; 1975 default: 1976 return TMR_UNKNOWN; 1977 } 1978 } 1979 1980 int 1981 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1982 unsigned char *buf) 1983 { 1984 struct se_tmr_req *se_tmr; 1985 struct iscsi_tmr_req *tmr_req; 1986 struct iscsi_tm *hdr; 1987 int out_of_order_cmdsn = 0, ret; 1988 u8 function, tcm_function = TMR_UNKNOWN; 1989 1990 hdr = (struct iscsi_tm *) buf; 1991 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1992 function = hdr->flags; 1993 1994 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1995 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1996 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1997 hdr->rtt, hdr->refcmdsn, conn->cid); 1998 1999 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2000 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2001 hdr->rtt != RESERVED_ITT)) { 2002 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 2003 hdr->rtt = RESERVED_ITT; 2004 } 2005 2006 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 2007 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2008 pr_err("Task Management Request TASK_REASSIGN not" 2009 " issued as immediate command, bad iSCSI Initiator" 2010 "implementation\n"); 2011 return iscsit_add_reject_cmd(cmd, 2012 ISCSI_REASON_PROTOCOL_ERROR, buf); 2013 } 2014 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2015 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 2016 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 2017 2018 cmd->data_direction = DMA_NONE; 2019 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 2020 if (!cmd->tmr_req) { 2021 return iscsit_add_reject_cmd(cmd, 2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2023 buf); 2024 } 2025 2026 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 2027 conn->sess->se_sess, 0, DMA_NONE, 2028 TCM_SIMPLE_TAG, cmd->sense_buffer + 2, 2029 scsilun_to_int(&hdr->lun)); 2030 2031 target_get_sess_cmd(&cmd->se_cmd, true); 2032 2033 /* 2034 * TASK_REASSIGN for ERL=2 / connection stays inside of 2035 * LIO-Target $FABRIC_MOD 2036 */ 2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2038 tcm_function = iscsit_convert_tmf(function); 2039 if (tcm_function == TMR_UNKNOWN) { 2040 pr_err("Unknown iSCSI TMR Function:" 2041 " 0x%02x\n", function); 2042 return iscsit_add_reject_cmd(cmd, 2043 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2044 } 2045 } 2046 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2047 GFP_KERNEL); 2048 if (ret < 0) 2049 return iscsit_add_reject_cmd(cmd, 2050 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2051 2052 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2053 2054 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2055 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2056 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2057 cmd->init_task_tag = hdr->itt; 2058 cmd->targ_xfer_tag = 0xFFFFFFFF; 2059 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2060 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2061 se_tmr = cmd->se_cmd.se_tmr_req; 2062 tmr_req = cmd->tmr_req; 2063 /* 2064 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2065 */ 2066 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2067 ret = transport_lookup_tmr_lun(&cmd->se_cmd); 2068 if (ret < 0) { 2069 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2070 goto attach; 2071 } 2072 } 2073 2074 switch (function) { 2075 case ISCSI_TM_FUNC_ABORT_TASK: 2076 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2077 if (se_tmr->response) 2078 goto attach; 2079 break; 2080 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2081 case ISCSI_TM_FUNC_CLEAR_ACA: 2082 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2083 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2084 break; 2085 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2086 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2087 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2088 goto attach; 2089 } 2090 break; 2091 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2092 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2093 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2094 goto attach; 2095 } 2096 break; 2097 case ISCSI_TM_FUNC_TASK_REASSIGN: 2098 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2099 /* 2100 * Perform sanity checks on the ExpDataSN only if the 2101 * TASK_REASSIGN was successful. 2102 */ 2103 if (se_tmr->response) 2104 break; 2105 2106 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2107 return iscsit_add_reject_cmd(cmd, 2108 ISCSI_REASON_BOOKMARK_INVALID, buf); 2109 break; 2110 default: 2111 pr_err("Unknown TMR function: 0x%02x, protocol" 2112 " error.\n", function); 2113 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2114 goto attach; 2115 } 2116 2117 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2118 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2119 se_tmr->call_transport = 1; 2120 attach: 2121 spin_lock_bh(&conn->cmd_lock); 2122 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2123 spin_unlock_bh(&conn->cmd_lock); 2124 2125 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2126 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2127 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2128 out_of_order_cmdsn = 1; 2129 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2130 target_put_sess_cmd(&cmd->se_cmd); 2131 return 0; 2132 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2133 return -1; 2134 } 2135 } 2136 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2137 2138 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2139 return 0; 2140 /* 2141 * Found the referenced task, send to transport for processing. 2142 */ 2143 if (se_tmr->call_transport) 2144 return transport_generic_handle_tmr(&cmd->se_cmd); 2145 2146 /* 2147 * Could not find the referenced LUN, task, or Task Management 2148 * command not authorized or supported. Change state and 2149 * let the tx_thread send the response. 2150 * 2151 * For connection recovery, this is also the default action for 2152 * TMR TASK_REASSIGN. 2153 */ 2154 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2155 target_put_sess_cmd(&cmd->se_cmd); 2156 return 0; 2157 } 2158 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2159 2160 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2161 int 2162 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2163 struct iscsi_text *hdr) 2164 { 2165 u32 payload_length = ntoh24(hdr->dlength); 2166 2167 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2168 pr_err("Unable to accept text parameter length: %u" 2169 "greater than MaxXmitDataSegmentLength %u.\n", 2170 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2171 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2172 (unsigned char *)hdr); 2173 } 2174 2175 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2176 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2177 pr_err("Multi sequence text commands currently not supported\n"); 2178 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2179 (unsigned char *)hdr); 2180 } 2181 2182 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2183 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2184 hdr->exp_statsn, payload_length); 2185 2186 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2187 cmd->i_state = ISTATE_SEND_TEXTRSP; 2188 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2189 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2190 cmd->targ_xfer_tag = 0xFFFFFFFF; 2191 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2192 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2193 cmd->data_direction = DMA_NONE; 2194 kfree(cmd->text_in_ptr); 2195 cmd->text_in_ptr = NULL; 2196 2197 return 0; 2198 } 2199 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2200 2201 int 2202 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2203 struct iscsi_text *hdr) 2204 { 2205 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2206 int cmdsn_ret; 2207 2208 if (!text_in) { 2209 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2210 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2211 pr_err("Unable to locate text_in buffer for sendtargets" 2212 " discovery\n"); 2213 goto reject; 2214 } 2215 goto empty_sendtargets; 2216 } 2217 if (strncmp("SendTargets=", text_in, 12) != 0) { 2218 pr_err("Received Text Data that is not" 2219 " SendTargets, cannot continue.\n"); 2220 goto reject; 2221 } 2222 /* '=' confirmed in strncmp */ 2223 text_ptr = strchr(text_in, '='); 2224 BUG_ON(!text_ptr); 2225 if (!strncmp("=All", text_ptr, 5)) { 2226 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2227 } else if (!strncmp("=iqn.", text_ptr, 5) || 2228 !strncmp("=eui.", text_ptr, 5)) { 2229 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2230 } else { 2231 pr_err("Unable to locate valid SendTargets%s value\n", 2232 text_ptr); 2233 goto reject; 2234 } 2235 2236 spin_lock_bh(&conn->cmd_lock); 2237 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2238 spin_unlock_bh(&conn->cmd_lock); 2239 2240 empty_sendtargets: 2241 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2242 2243 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2244 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2245 (unsigned char *)hdr, hdr->cmdsn); 2246 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2247 return -1; 2248 2249 return 0; 2250 } 2251 2252 return iscsit_execute_cmd(cmd, 0); 2253 2254 reject: 2255 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2256 (unsigned char *)hdr); 2257 } 2258 EXPORT_SYMBOL(iscsit_process_text_cmd); 2259 2260 static int 2261 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2262 unsigned char *buf) 2263 { 2264 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2265 char *text_in = NULL; 2266 u32 payload_length = ntoh24(hdr->dlength); 2267 int rx_size, rc; 2268 2269 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2270 if (rc < 0) 2271 return 0; 2272 2273 rx_size = payload_length; 2274 if (payload_length) { 2275 u32 checksum = 0, data_crc = 0; 2276 u32 padding = 0; 2277 int niov = 0, rx_got; 2278 struct kvec iov[2]; 2279 2280 rx_size = ALIGN(payload_length, 4); 2281 text_in = kzalloc(rx_size, GFP_KERNEL); 2282 if (!text_in) 2283 goto reject; 2284 2285 cmd->text_in_ptr = text_in; 2286 2287 memset(iov, 0, sizeof(iov)); 2288 iov[niov].iov_base = text_in; 2289 iov[niov++].iov_len = rx_size; 2290 2291 padding = rx_size - payload_length; 2292 if (padding) 2293 pr_debug("Receiving %u additional bytes" 2294 " for padding.\n", padding); 2295 if (conn->conn_ops->DataDigest) { 2296 iov[niov].iov_base = &checksum; 2297 iov[niov++].iov_len = ISCSI_CRC_LEN; 2298 rx_size += ISCSI_CRC_LEN; 2299 } 2300 2301 WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); 2302 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2303 if (rx_got != rx_size) 2304 goto reject; 2305 2306 if (conn->conn_ops->DataDigest) { 2307 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2308 text_in, rx_size, 0, NULL, 2309 &data_crc); 2310 2311 if (checksum != data_crc) { 2312 pr_err("Text data CRC32C DataDigest" 2313 " 0x%08x does not match computed" 2314 " 0x%08x\n", checksum, data_crc); 2315 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2316 pr_err("Unable to recover from" 2317 " Text Data digest failure while in" 2318 " ERL=0.\n"); 2319 goto reject; 2320 } else { 2321 /* 2322 * Silently drop this PDU and let the 2323 * initiator plug the CmdSN gap. 2324 */ 2325 pr_debug("Dropping Text" 2326 " Command CmdSN: 0x%08x due to" 2327 " DataCRC error.\n", hdr->cmdsn); 2328 kfree(text_in); 2329 return 0; 2330 } 2331 } else { 2332 pr_debug("Got CRC32C DataDigest" 2333 " 0x%08x for %u bytes of text data.\n", 2334 checksum, payload_length); 2335 } 2336 } 2337 text_in[payload_length - 1] = '\0'; 2338 pr_debug("Successfully read %d bytes of text" 2339 " data.\n", payload_length); 2340 } 2341 2342 return iscsit_process_text_cmd(conn, cmd, hdr); 2343 2344 reject: 2345 kfree(cmd->text_in_ptr); 2346 cmd->text_in_ptr = NULL; 2347 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2348 } 2349 2350 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2351 { 2352 struct iscsit_conn *conn_p; 2353 struct iscsit_session *sess = conn->sess; 2354 2355 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2356 " for SID: %u.\n", conn->cid, conn->sess->sid); 2357 2358 atomic_set(&sess->session_logout, 1); 2359 atomic_set(&conn->conn_logout_remove, 1); 2360 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2361 2362 iscsit_inc_conn_usage_count(conn); 2363 iscsit_inc_session_usage_count(sess); 2364 2365 spin_lock_bh(&sess->conn_lock); 2366 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2367 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2368 continue; 2369 2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2371 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2372 } 2373 spin_unlock_bh(&sess->conn_lock); 2374 2375 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2376 2377 return 0; 2378 } 2379 2380 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2381 { 2382 struct iscsit_conn *l_conn; 2383 struct iscsit_session *sess = conn->sess; 2384 2385 pr_debug("Received logout request CLOSECONNECTION for CID:" 2386 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2387 2388 /* 2389 * A Logout Request with a CLOSECONNECTION reason code for a CID 2390 * can arrive on a connection with a differing CID. 2391 */ 2392 if (conn->cid == cmd->logout_cid) { 2393 spin_lock_bh(&conn->state_lock); 2394 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2395 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2396 2397 atomic_set(&conn->conn_logout_remove, 1); 2398 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2399 iscsit_inc_conn_usage_count(conn); 2400 2401 spin_unlock_bh(&conn->state_lock); 2402 } else { 2403 /* 2404 * Handle all different cid CLOSECONNECTION requests in 2405 * iscsit_logout_post_handler_diffcid() as to give enough 2406 * time for any non immediate command's CmdSN to be 2407 * acknowledged on the connection in question. 2408 * 2409 * Here we simply make sure the CID is still around. 2410 */ 2411 l_conn = iscsit_get_conn_from_cid(sess, 2412 cmd->logout_cid); 2413 if (!l_conn) { 2414 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2415 iscsit_add_cmd_to_response_queue(cmd, conn, 2416 cmd->i_state); 2417 return 0; 2418 } 2419 2420 iscsit_dec_conn_usage_count(l_conn); 2421 } 2422 2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2424 2425 return 0; 2426 } 2427 2428 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2429 { 2430 struct iscsit_session *sess = conn->sess; 2431 2432 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2433 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2434 2435 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2436 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2437 " while ERL!=2.\n"); 2438 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2440 return 0; 2441 } 2442 2443 if (conn->cid == cmd->logout_cid) { 2444 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2445 " with CID: %hu on CID: %hu, implementation error.\n", 2446 cmd->logout_cid, conn->cid); 2447 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2448 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2449 return 0; 2450 } 2451 2452 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2453 2454 return 0; 2455 } 2456 2457 int 2458 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2459 unsigned char *buf) 2460 { 2461 int cmdsn_ret, logout_remove = 0; 2462 u8 reason_code = 0; 2463 struct iscsi_logout *hdr; 2464 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2465 2466 hdr = (struct iscsi_logout *) buf; 2467 reason_code = (hdr->flags & 0x7f); 2468 2469 if (tiqn) { 2470 spin_lock(&tiqn->logout_stats.lock); 2471 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2472 tiqn->logout_stats.normal_logouts++; 2473 else 2474 tiqn->logout_stats.abnormal_logouts++; 2475 spin_unlock(&tiqn->logout_stats.lock); 2476 } 2477 2478 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2479 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2480 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2481 hdr->cid, conn->cid); 2482 2483 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2484 pr_err("Received logout request on connection that" 2485 " is not in logged in state, ignoring request.\n"); 2486 iscsit_free_cmd(cmd, false); 2487 return 0; 2488 } 2489 2490 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2491 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2492 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2493 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2494 cmd->targ_xfer_tag = 0xFFFFFFFF; 2495 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2496 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2497 cmd->logout_cid = be16_to_cpu(hdr->cid); 2498 cmd->logout_reason = reason_code; 2499 cmd->data_direction = DMA_NONE; 2500 2501 /* 2502 * We need to sleep in these cases (by returning 1) until the Logout 2503 * Response gets sent in the tx thread. 2504 */ 2505 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2506 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2507 be16_to_cpu(hdr->cid) == conn->cid)) 2508 logout_remove = 1; 2509 2510 spin_lock_bh(&conn->cmd_lock); 2511 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2512 spin_unlock_bh(&conn->cmd_lock); 2513 2514 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2515 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2516 2517 /* 2518 * Immediate commands are executed, well, immediately. 2519 * Non-Immediate Logout Commands are executed in CmdSN order. 2520 */ 2521 if (cmd->immediate_cmd) { 2522 int ret = iscsit_execute_cmd(cmd, 0); 2523 2524 if (ret < 0) 2525 return ret; 2526 } else { 2527 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2528 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2529 logout_remove = 0; 2530 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2531 return -1; 2532 } 2533 2534 return logout_remove; 2535 } 2536 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2537 2538 int iscsit_handle_snack( 2539 struct iscsit_conn *conn, 2540 unsigned char *buf) 2541 { 2542 struct iscsi_snack *hdr; 2543 2544 hdr = (struct iscsi_snack *) buf; 2545 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2546 2547 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2548 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2549 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2550 hdr->begrun, hdr->runlength, conn->cid); 2551 2552 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2553 pr_err("Initiator sent SNACK request while in" 2554 " ErrorRecoveryLevel=0.\n"); 2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2556 buf); 2557 } 2558 /* 2559 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2560 * call from inside iscsi_send_recovery_datain_or_r2t(). 2561 */ 2562 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2563 case 0: 2564 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2565 hdr->itt, 2566 be32_to_cpu(hdr->ttt), 2567 be32_to_cpu(hdr->begrun), 2568 be32_to_cpu(hdr->runlength)); 2569 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2570 return iscsit_handle_status_snack(conn, hdr->itt, 2571 be32_to_cpu(hdr->ttt), 2572 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2573 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2574 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2575 be32_to_cpu(hdr->begrun), 2576 be32_to_cpu(hdr->runlength)); 2577 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2578 /* FIXME: Support R-Data SNACK */ 2579 pr_err("R-Data SNACK Not Supported.\n"); 2580 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2581 buf); 2582 default: 2583 pr_err("Unknown SNACK type 0x%02x, protocol" 2584 " error.\n", hdr->flags & 0x0f); 2585 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2586 buf); 2587 } 2588 2589 return 0; 2590 } 2591 EXPORT_SYMBOL(iscsit_handle_snack); 2592 2593 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn) 2594 { 2595 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2596 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2597 wait_for_completion_interruptible_timeout( 2598 &conn->rx_half_close_comp, 2599 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2600 } 2601 } 2602 2603 static int iscsit_handle_immediate_data( 2604 struct iscsit_cmd *cmd, 2605 struct iscsi_scsi_req *hdr, 2606 u32 length) 2607 { 2608 int iov_ret, rx_got = 0, rx_size = 0; 2609 u32 checksum, iov_count = 0, padding = 0; 2610 struct iscsit_conn *conn = cmd->conn; 2611 struct kvec *iov; 2612 void *overflow_buf = NULL; 2613 2614 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2615 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2616 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2617 cmd->orig_iov_data_count - 2, 2618 cmd->write_data_done, rx_size); 2619 if (iov_ret < 0) 2620 return IMMEDIATE_DATA_CANNOT_RECOVER; 2621 2622 iov_count = iov_ret; 2623 iov = &cmd->iov_data[0]; 2624 if (rx_size < length) { 2625 /* 2626 * Special case: length of immediate data exceeds the data 2627 * buffer size derived from the CDB. 2628 */ 2629 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2630 if (!overflow_buf) { 2631 iscsit_unmap_iovec(cmd); 2632 return IMMEDIATE_DATA_CANNOT_RECOVER; 2633 } 2634 cmd->overflow_buf = overflow_buf; 2635 iov[iov_count].iov_base = overflow_buf; 2636 iov[iov_count].iov_len = length - rx_size; 2637 iov_count++; 2638 rx_size = length; 2639 } 2640 2641 padding = ((-length) & 3); 2642 if (padding != 0) { 2643 iov[iov_count].iov_base = cmd->pad_bytes; 2644 iov[iov_count++].iov_len = padding; 2645 rx_size += padding; 2646 } 2647 2648 if (conn->conn_ops->DataDigest) { 2649 iov[iov_count].iov_base = &checksum; 2650 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2651 rx_size += ISCSI_CRC_LEN; 2652 } 2653 2654 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2655 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2656 2657 iscsit_unmap_iovec(cmd); 2658 2659 if (rx_got != rx_size) { 2660 iscsit_rx_thread_wait_for_tcp(conn); 2661 return IMMEDIATE_DATA_CANNOT_RECOVER; 2662 } 2663 2664 if (conn->conn_ops->DataDigest) { 2665 u32 data_crc; 2666 2667 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2668 cmd->write_data_done, length, padding, 2669 cmd->pad_bytes); 2670 2671 if (checksum != data_crc) { 2672 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2673 " does not match computed 0x%08x\n", checksum, 2674 data_crc); 2675 2676 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2677 pr_err("Unable to recover from" 2678 " Immediate Data digest failure while" 2679 " in ERL=0.\n"); 2680 iscsit_reject_cmd(cmd, 2681 ISCSI_REASON_DATA_DIGEST_ERROR, 2682 (unsigned char *)hdr); 2683 return IMMEDIATE_DATA_CANNOT_RECOVER; 2684 } else { 2685 iscsit_reject_cmd(cmd, 2686 ISCSI_REASON_DATA_DIGEST_ERROR, 2687 (unsigned char *)hdr); 2688 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2689 } 2690 } else { 2691 pr_debug("Got CRC32C DataDigest 0x%08x for" 2692 " %u bytes of Immediate Data\n", checksum, 2693 length); 2694 } 2695 } 2696 2697 cmd->write_data_done += length; 2698 2699 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2700 spin_lock_bh(&cmd->istate_lock); 2701 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2702 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2703 spin_unlock_bh(&cmd->istate_lock); 2704 } 2705 2706 return IMMEDIATE_DATA_NORMAL_OPERATION; 2707 } 2708 2709 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2710 with active network interface */ 2711 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn) 2712 { 2713 struct iscsit_cmd *cmd; 2714 struct iscsit_conn *conn_p; 2715 bool found = false; 2716 2717 lockdep_assert_held(&conn->sess->conn_lock); 2718 2719 /* 2720 * Only send a Asynchronous Message on connections whos network 2721 * interface is still functional. 2722 */ 2723 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2724 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2725 iscsit_inc_conn_usage_count(conn_p); 2726 found = true; 2727 break; 2728 } 2729 } 2730 2731 if (!found) 2732 return; 2733 2734 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2735 if (!cmd) { 2736 iscsit_dec_conn_usage_count(conn_p); 2737 return; 2738 } 2739 2740 cmd->logout_cid = conn->cid; 2741 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2742 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2743 2744 spin_lock_bh(&conn_p->cmd_lock); 2745 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2746 spin_unlock_bh(&conn_p->cmd_lock); 2747 2748 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2749 iscsit_dec_conn_usage_count(conn_p); 2750 } 2751 2752 static int iscsit_send_conn_drop_async_message( 2753 struct iscsit_cmd *cmd, 2754 struct iscsit_conn *conn) 2755 { 2756 struct iscsi_async *hdr; 2757 2758 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2759 2760 hdr = (struct iscsi_async *) cmd->pdu; 2761 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2762 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2763 cmd->init_task_tag = RESERVED_ITT; 2764 cmd->targ_xfer_tag = 0xFFFFFFFF; 2765 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2766 cmd->stat_sn = conn->stat_sn++; 2767 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2768 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2769 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2770 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2771 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2772 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2773 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2774 2775 pr_debug("Sending Connection Dropped Async Message StatSN:" 2776 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2777 cmd->logout_cid, conn->cid); 2778 2779 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2780 } 2781 2782 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn) 2783 { 2784 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2785 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2786 wait_for_completion_interruptible_timeout( 2787 &conn->tx_half_close_comp, 2788 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2789 } 2790 } 2791 2792 void 2793 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2794 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2795 bool set_statsn) 2796 { 2797 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2798 hdr->flags = datain->flags; 2799 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2800 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2801 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2802 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2803 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2804 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2805 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2806 } 2807 } 2808 hton24(hdr->dlength, datain->length); 2809 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2810 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2811 (struct scsi_lun *)&hdr->lun); 2812 else 2813 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2814 2815 hdr->itt = cmd->init_task_tag; 2816 2817 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2818 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2819 else 2820 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2821 if (set_statsn) 2822 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2823 else 2824 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2825 2826 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2827 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2828 hdr->datasn = cpu_to_be32(datain->data_sn); 2829 hdr->offset = cpu_to_be32(datain->offset); 2830 2831 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2832 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2833 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2834 ntohl(hdr->offset), datain->length, conn->cid); 2835 } 2836 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2837 2838 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2839 { 2840 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2841 struct iscsi_datain datain; 2842 struct iscsi_datain_req *dr; 2843 int eodr = 0, ret; 2844 bool set_statsn = false; 2845 2846 memset(&datain, 0, sizeof(struct iscsi_datain)); 2847 dr = iscsit_get_datain_values(cmd, &datain); 2848 if (!dr) { 2849 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2850 cmd->init_task_tag); 2851 return -1; 2852 } 2853 /* 2854 * Be paranoid and double check the logic for now. 2855 */ 2856 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2857 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2858 " datain.length: %u exceeds cmd->data_length: %u\n", 2859 cmd->init_task_tag, datain.offset, datain.length, 2860 cmd->se_cmd.data_length); 2861 return -1; 2862 } 2863 2864 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2865 /* 2866 * Special case for successfully execution w/ both DATAIN 2867 * and Sense Data. 2868 */ 2869 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2870 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2871 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2872 else { 2873 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2874 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2875 iscsit_increment_maxcmdsn(cmd, conn->sess); 2876 cmd->stat_sn = conn->stat_sn++; 2877 set_statsn = true; 2878 } else if (dr->dr_complete == 2879 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2880 set_statsn = true; 2881 } 2882 2883 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2884 2885 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2886 if (ret < 0) 2887 return ret; 2888 2889 if (dr->dr_complete) { 2890 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2891 2 : 1; 2892 iscsit_free_datain_req(cmd, dr); 2893 } 2894 2895 return eodr; 2896 } 2897 2898 int 2899 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2900 struct iscsi_logout_rsp *hdr) 2901 { 2902 struct iscsit_conn *logout_conn = NULL; 2903 struct iscsi_conn_recovery *cr = NULL; 2904 struct iscsit_session *sess = conn->sess; 2905 /* 2906 * The actual shutting down of Sessions and/or Connections 2907 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2908 * is done in scsi_logout_post_handler(). 2909 */ 2910 switch (cmd->logout_reason) { 2911 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2912 pr_debug("iSCSI session logout successful, setting" 2913 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2914 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2915 break; 2916 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2917 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2918 break; 2919 /* 2920 * For CLOSECONNECTION logout requests carrying 2921 * a matching logout CID -> local CID, the reference 2922 * for the local CID will have been incremented in 2923 * iscsi_logout_closeconnection(). 2924 * 2925 * For CLOSECONNECTION logout requests carrying 2926 * a different CID than the connection it arrived 2927 * on, the connection responding to cmd->logout_cid 2928 * is stopped in iscsit_logout_post_handler_diffcid(). 2929 */ 2930 2931 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2932 " successful.\n", cmd->logout_cid, conn->cid); 2933 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2934 break; 2935 case ISCSI_LOGOUT_REASON_RECOVERY: 2936 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2937 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2938 break; 2939 /* 2940 * If the connection is still active from our point of view 2941 * force connection recovery to occur. 2942 */ 2943 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2944 cmd->logout_cid); 2945 if (logout_conn) { 2946 iscsit_connection_reinstatement_rcfr(logout_conn); 2947 iscsit_dec_conn_usage_count(logout_conn); 2948 } 2949 2950 cr = iscsit_get_inactive_connection_recovery_entry( 2951 conn->sess, cmd->logout_cid); 2952 if (!cr) { 2953 pr_err("Unable to locate CID: %hu for" 2954 " REMOVECONNFORRECOVERY Logout Request.\n", 2955 cmd->logout_cid); 2956 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2957 break; 2958 } 2959 2960 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2961 2962 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2963 " for recovery for CID: %hu on CID: %hu successful.\n", 2964 cmd->logout_cid, conn->cid); 2965 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2966 break; 2967 default: 2968 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2969 cmd->logout_reason); 2970 return -1; 2971 } 2972 2973 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2974 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2975 hdr->response = cmd->logout_response; 2976 hdr->itt = cmd->init_task_tag; 2977 cmd->stat_sn = conn->stat_sn++; 2978 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2979 2980 iscsit_increment_maxcmdsn(cmd, conn->sess); 2981 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2982 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2983 2984 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2985 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2986 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2987 cmd->logout_cid, conn->cid); 2988 2989 return 0; 2990 } 2991 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2992 2993 static int 2994 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2995 { 2996 int rc; 2997 2998 rc = iscsit_build_logout_rsp(cmd, conn, 2999 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 3000 if (rc < 0) 3001 return rc; 3002 3003 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3004 } 3005 3006 void 3007 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3008 struct iscsi_nopin *hdr, bool nopout_response) 3009 { 3010 hdr->opcode = ISCSI_OP_NOOP_IN; 3011 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3012 hton24(hdr->dlength, cmd->buf_ptr_size); 3013 if (nopout_response) 3014 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 3015 hdr->itt = cmd->init_task_tag; 3016 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3017 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 3018 conn->stat_sn; 3019 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3020 3021 if (nopout_response) 3022 iscsit_increment_maxcmdsn(cmd, conn->sess); 3023 3024 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3025 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3026 3027 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3028 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3029 "Solicited" : "Unsolicited", cmd->init_task_tag, 3030 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3031 } 3032 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3033 3034 /* 3035 * Unsolicited NOPIN, either requesting a response or not. 3036 */ 3037 static int iscsit_send_unsolicited_nopin( 3038 struct iscsit_cmd *cmd, 3039 struct iscsit_conn *conn, 3040 int want_response) 3041 { 3042 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3043 int ret; 3044 3045 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3046 3047 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3048 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3049 3050 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3051 if (ret < 0) 3052 return ret; 3053 3054 spin_lock_bh(&cmd->istate_lock); 3055 cmd->i_state = want_response ? 3056 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3057 spin_unlock_bh(&cmd->istate_lock); 3058 3059 return 0; 3060 } 3061 3062 static int 3063 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3064 { 3065 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3066 3067 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3068 3069 /* 3070 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr. 3071 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size. 3072 */ 3073 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3074 3075 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3076 cmd->buf_ptr, 3077 cmd->buf_ptr_size); 3078 } 3079 3080 static int iscsit_send_r2t( 3081 struct iscsit_cmd *cmd, 3082 struct iscsit_conn *conn) 3083 { 3084 struct iscsi_r2t *r2t; 3085 struct iscsi_r2t_rsp *hdr; 3086 int ret; 3087 3088 r2t = iscsit_get_r2t_from_list(cmd); 3089 if (!r2t) 3090 return -1; 3091 3092 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3093 memset(hdr, 0, ISCSI_HDR_LEN); 3094 hdr->opcode = ISCSI_OP_R2T; 3095 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3096 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3097 (struct scsi_lun *)&hdr->lun); 3098 hdr->itt = cmd->init_task_tag; 3099 if (conn->conn_transport->iscsit_get_r2t_ttt) 3100 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3101 else 3102 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3103 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3104 hdr->statsn = cpu_to_be32(conn->stat_sn); 3105 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3106 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3107 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3108 hdr->data_offset = cpu_to_be32(r2t->offset); 3109 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3110 3111 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3112 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3113 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3114 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3115 r2t->offset, r2t->xfer_len, conn->cid); 3116 3117 spin_lock_bh(&cmd->r2t_lock); 3118 r2t->sent_r2t = 1; 3119 spin_unlock_bh(&cmd->r2t_lock); 3120 3121 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3122 if (ret < 0) { 3123 return ret; 3124 } 3125 3126 spin_lock_bh(&cmd->dataout_timeout_lock); 3127 iscsit_start_dataout_timer(cmd, conn); 3128 spin_unlock_bh(&cmd->dataout_timeout_lock); 3129 3130 return 0; 3131 } 3132 3133 /* 3134 * @recovery: If called from iscsi_task_reassign_complete_write() for 3135 * connection recovery. 3136 */ 3137 int iscsit_build_r2ts_for_cmd( 3138 struct iscsit_conn *conn, 3139 struct iscsit_cmd *cmd, 3140 bool recovery) 3141 { 3142 int first_r2t = 1; 3143 u32 offset = 0, xfer_len = 0; 3144 3145 spin_lock_bh(&cmd->r2t_lock); 3146 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3147 spin_unlock_bh(&cmd->r2t_lock); 3148 return 0; 3149 } 3150 3151 if (conn->sess->sess_ops->DataSequenceInOrder && 3152 !recovery) 3153 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3154 3155 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3156 if (conn->sess->sess_ops->DataSequenceInOrder) { 3157 offset = cmd->r2t_offset; 3158 3159 if (first_r2t && recovery) { 3160 int new_data_end = offset + 3161 conn->sess->sess_ops->MaxBurstLength - 3162 cmd->next_burst_len; 3163 3164 if (new_data_end > cmd->se_cmd.data_length) 3165 xfer_len = cmd->se_cmd.data_length - offset; 3166 else 3167 xfer_len = 3168 conn->sess->sess_ops->MaxBurstLength - 3169 cmd->next_burst_len; 3170 } else { 3171 int new_data_end = offset + 3172 conn->sess->sess_ops->MaxBurstLength; 3173 3174 if (new_data_end > cmd->se_cmd.data_length) 3175 xfer_len = cmd->se_cmd.data_length - offset; 3176 else 3177 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3178 } 3179 3180 if ((s32)xfer_len < 0) { 3181 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3182 break; 3183 } 3184 3185 cmd->r2t_offset += xfer_len; 3186 3187 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3188 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3189 } else { 3190 struct iscsi_seq *seq; 3191 3192 seq = iscsit_get_seq_holder_for_r2t(cmd); 3193 if (!seq) { 3194 spin_unlock_bh(&cmd->r2t_lock); 3195 return -1; 3196 } 3197 3198 offset = seq->offset; 3199 xfer_len = seq->xfer_len; 3200 3201 if (cmd->seq_send_order == cmd->seq_count) 3202 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3203 } 3204 cmd->outstanding_r2ts++; 3205 first_r2t = 0; 3206 3207 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3208 spin_unlock_bh(&cmd->r2t_lock); 3209 return -1; 3210 } 3211 3212 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3213 break; 3214 } 3215 spin_unlock_bh(&cmd->r2t_lock); 3216 3217 return 0; 3218 } 3219 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3220 3221 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3222 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3223 { 3224 if (inc_stat_sn) 3225 cmd->stat_sn = conn->stat_sn++; 3226 3227 atomic_long_inc(&conn->sess->rsp_pdus); 3228 3229 memset(hdr, 0, ISCSI_HDR_LEN); 3230 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3231 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3232 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3233 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3234 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3235 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3236 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3237 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3238 } 3239 hdr->response = cmd->iscsi_response; 3240 hdr->cmd_status = cmd->se_cmd.scsi_status; 3241 hdr->itt = cmd->init_task_tag; 3242 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3243 3244 iscsit_increment_maxcmdsn(cmd, conn->sess); 3245 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3246 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3247 3248 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3249 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3250 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3251 cmd->se_cmd.scsi_status, conn->cid); 3252 } 3253 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3254 3255 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3256 { 3257 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3258 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3259 void *data_buf = NULL; 3260 u32 padding = 0, data_buf_len = 0; 3261 3262 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3263 3264 /* 3265 * Attach SENSE DATA payload to iSCSI Response PDU 3266 */ 3267 if (cmd->se_cmd.sense_buffer && 3268 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3269 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3270 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3271 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3272 3273 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3274 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3275 data_buf = cmd->sense_buffer; 3276 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3277 3278 if (padding) { 3279 memset(cmd->sense_buffer + 3280 cmd->se_cmd.scsi_sense_length, 0, padding); 3281 pr_debug("Adding %u bytes of padding to" 3282 " SENSE.\n", padding); 3283 } 3284 3285 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3286 " Response PDU\n", 3287 cmd->se_cmd.scsi_sense_length); 3288 } 3289 3290 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3291 data_buf_len); 3292 } 3293 3294 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3295 { 3296 switch (se_tmr->response) { 3297 case TMR_FUNCTION_COMPLETE: 3298 return ISCSI_TMF_RSP_COMPLETE; 3299 case TMR_TASK_DOES_NOT_EXIST: 3300 return ISCSI_TMF_RSP_NO_TASK; 3301 case TMR_LUN_DOES_NOT_EXIST: 3302 return ISCSI_TMF_RSP_NO_LUN; 3303 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3304 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3305 case TMR_FUNCTION_REJECTED: 3306 default: 3307 return ISCSI_TMF_RSP_REJECTED; 3308 } 3309 } 3310 3311 void 3312 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3313 struct iscsi_tm_rsp *hdr) 3314 { 3315 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3316 3317 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3318 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3319 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3320 hdr->itt = cmd->init_task_tag; 3321 cmd->stat_sn = conn->stat_sn++; 3322 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3323 3324 iscsit_increment_maxcmdsn(cmd, conn->sess); 3325 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3326 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3327 3328 pr_debug("Built Task Management Response ITT: 0x%08x," 3329 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3330 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3331 } 3332 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3333 3334 static int 3335 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3336 { 3337 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3338 3339 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3340 3341 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3342 } 3343 3344 #define SENDTARGETS_BUF_LIMIT 32768U 3345 3346 static int 3347 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd, 3348 enum iscsit_transport_type network_transport, 3349 int skip_bytes, bool *completed) 3350 { 3351 char *payload = NULL; 3352 struct iscsit_conn *conn = cmd->conn; 3353 struct iscsi_portal_group *tpg; 3354 struct iscsi_tiqn *tiqn; 3355 struct iscsi_tpg_np *tpg_np; 3356 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3357 int target_name_printed; 3358 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3359 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3360 bool active; 3361 3362 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3363 SENDTARGETS_BUF_LIMIT); 3364 3365 payload = kzalloc(buffer_len, GFP_KERNEL); 3366 if (!payload) 3367 return -ENOMEM; 3368 3369 /* 3370 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3371 * explicit case.. 3372 */ 3373 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3374 text_ptr = strchr(text_in, '='); 3375 if (!text_ptr) { 3376 pr_err("Unable to locate '=' string in text_in:" 3377 " %s\n", text_in); 3378 kfree(payload); 3379 return -EINVAL; 3380 } 3381 /* 3382 * Skip over '=' character.. 3383 */ 3384 text_ptr += 1; 3385 } 3386 3387 spin_lock(&tiqn_lock); 3388 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3389 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3390 strcmp(tiqn->tiqn, text_ptr)) { 3391 continue; 3392 } 3393 3394 target_name_printed = 0; 3395 3396 spin_lock(&tiqn->tiqn_tpg_lock); 3397 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3398 3399 /* If demo_mode_discovery=0 and generate_node_acls=0 3400 * (demo mode dislabed) do not return 3401 * TargetName+TargetAddress unless a NodeACL exists. 3402 */ 3403 3404 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3405 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3406 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3407 cmd->conn->sess->sess_ops->InitiatorName))) { 3408 continue; 3409 } 3410 3411 spin_lock(&tpg->tpg_state_lock); 3412 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3413 spin_unlock(&tpg->tpg_state_lock); 3414 3415 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3416 continue; 3417 3418 spin_lock(&tpg->tpg_np_lock); 3419 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3420 tpg_np_list) { 3421 struct iscsi_np *np = tpg_np->tpg_np; 3422 struct sockaddr_storage *sockaddr; 3423 3424 if (np->np_network_transport != network_transport) 3425 continue; 3426 3427 if (!target_name_printed) { 3428 len = sprintf(buf, "TargetName=%s", 3429 tiqn->tiqn); 3430 len += 1; 3431 3432 if ((len + payload_len) > buffer_len) { 3433 spin_unlock(&tpg->tpg_np_lock); 3434 spin_unlock(&tiqn->tiqn_tpg_lock); 3435 end_of_buf = 1; 3436 goto eob; 3437 } 3438 3439 if (skip_bytes && len <= skip_bytes) { 3440 skip_bytes -= len; 3441 } else { 3442 memcpy(payload + payload_len, buf, len); 3443 payload_len += len; 3444 target_name_printed = 1; 3445 if (len > skip_bytes) 3446 skip_bytes = 0; 3447 } 3448 } 3449 3450 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3451 sockaddr = &conn->local_sockaddr; 3452 else 3453 sockaddr = &np->np_sockaddr; 3454 3455 len = sprintf(buf, "TargetAddress=" 3456 "%pISpc,%hu", 3457 sockaddr, 3458 tpg->tpgt); 3459 len += 1; 3460 3461 if ((len + payload_len) > buffer_len) { 3462 spin_unlock(&tpg->tpg_np_lock); 3463 spin_unlock(&tiqn->tiqn_tpg_lock); 3464 end_of_buf = 1; 3465 goto eob; 3466 } 3467 3468 if (skip_bytes && len <= skip_bytes) { 3469 skip_bytes -= len; 3470 } else { 3471 memcpy(payload + payload_len, buf, len); 3472 payload_len += len; 3473 if (len > skip_bytes) 3474 skip_bytes = 0; 3475 } 3476 } 3477 spin_unlock(&tpg->tpg_np_lock); 3478 } 3479 spin_unlock(&tiqn->tiqn_tpg_lock); 3480 eob: 3481 if (end_of_buf) { 3482 *completed = false; 3483 break; 3484 } 3485 3486 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3487 break; 3488 } 3489 spin_unlock(&tiqn_lock); 3490 3491 cmd->buf_ptr = payload; 3492 3493 return payload_len; 3494 } 3495 3496 int 3497 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3498 struct iscsi_text_rsp *hdr, 3499 enum iscsit_transport_type network_transport) 3500 { 3501 int text_length, padding; 3502 bool completed = true; 3503 3504 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3505 cmd->read_data_done, 3506 &completed); 3507 if (text_length < 0) 3508 return text_length; 3509 3510 if (completed) { 3511 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3512 } else { 3513 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3514 cmd->read_data_done += text_length; 3515 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3516 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3517 } 3518 hdr->opcode = ISCSI_OP_TEXT_RSP; 3519 padding = ((-text_length) & 3); 3520 hton24(hdr->dlength, text_length); 3521 hdr->itt = cmd->init_task_tag; 3522 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3523 cmd->stat_sn = conn->stat_sn++; 3524 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3525 3526 iscsit_increment_maxcmdsn(cmd, conn->sess); 3527 /* 3528 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3529 * correctly increment MaxCmdSN for each response answering a 3530 * non immediate text request with a valid CmdSN. 3531 */ 3532 cmd->maxcmdsn_inc = 0; 3533 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3534 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3535 3536 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3537 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3538 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3539 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3540 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3541 3542 return text_length + padding; 3543 } 3544 EXPORT_SYMBOL(iscsit_build_text_rsp); 3545 3546 static int iscsit_send_text_rsp( 3547 struct iscsit_cmd *cmd, 3548 struct iscsit_conn *conn) 3549 { 3550 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3551 int text_length; 3552 3553 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3554 conn->conn_transport->transport_type); 3555 if (text_length < 0) 3556 return text_length; 3557 3558 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3559 cmd->buf_ptr, 3560 text_length); 3561 } 3562 3563 void 3564 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3565 struct iscsi_reject *hdr) 3566 { 3567 hdr->opcode = ISCSI_OP_REJECT; 3568 hdr->reason = cmd->reject_reason; 3569 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3570 hton24(hdr->dlength, ISCSI_HDR_LEN); 3571 hdr->ffffffff = cpu_to_be32(0xffffffff); 3572 cmd->stat_sn = conn->stat_sn++; 3573 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3574 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3575 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3576 3577 } 3578 EXPORT_SYMBOL(iscsit_build_reject); 3579 3580 static int iscsit_send_reject( 3581 struct iscsit_cmd *cmd, 3582 struct iscsit_conn *conn) 3583 { 3584 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3585 3586 iscsit_build_reject(cmd, conn, hdr); 3587 3588 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3589 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3590 3591 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3592 cmd->buf_ptr, 3593 ISCSI_HDR_LEN); 3594 } 3595 3596 void iscsit_thread_get_cpumask(struct iscsit_conn *conn) 3597 { 3598 int ord, cpu; 3599 cpumask_var_t conn_allowed_cpumask; 3600 3601 /* 3602 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3603 * within iscsit_start_kthreads() 3604 * 3605 * Here we use bitmap_id to determine which CPU that this 3606 * iSCSI connection's RX/TX threads will be scheduled to 3607 * execute upon. 3608 */ 3609 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) { 3610 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3611 for_each_online_cpu(cpu) { 3612 if (ord-- == 0) { 3613 cpumask_set_cpu(cpu, conn->conn_cpumask); 3614 return; 3615 } 3616 } 3617 } else { 3618 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask, 3619 cpu_online_mask); 3620 3621 cpumask_clear(conn->conn_cpumask); 3622 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask); 3623 for_each_cpu(cpu, conn_allowed_cpumask) { 3624 if (ord-- == 0) { 3625 cpumask_set_cpu(cpu, conn->conn_cpumask); 3626 free_cpumask_var(conn_allowed_cpumask); 3627 return; 3628 } 3629 } 3630 free_cpumask_var(conn_allowed_cpumask); 3631 } 3632 /* 3633 * This should never be reached.. 3634 */ 3635 dump_stack(); 3636 cpumask_setall(conn->conn_cpumask); 3637 } 3638 3639 static void iscsit_thread_reschedule(struct iscsit_conn *conn) 3640 { 3641 /* 3642 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI 3643 * connection's RX/TX threads update conn->allowed_cpumask. 3644 */ 3645 if (!cpumask_equal(iscsit_global->allowed_cpumask, 3646 conn->allowed_cpumask)) { 3647 iscsit_thread_get_cpumask(conn); 3648 conn->conn_tx_reset_cpumask = 1; 3649 conn->conn_rx_reset_cpumask = 1; 3650 cpumask_copy(conn->allowed_cpumask, 3651 iscsit_global->allowed_cpumask); 3652 } 3653 } 3654 3655 void iscsit_thread_check_cpumask( 3656 struct iscsit_conn *conn, 3657 struct task_struct *p, 3658 int mode) 3659 { 3660 /* 3661 * The TX and RX threads maybe call iscsit_thread_check_cpumask() 3662 * at the same time. The RX thread might be faster and return from 3663 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0. 3664 * Then the TX thread sets it back to 1. 3665 * The next time the RX thread loops, it sees conn_rx_reset_cpumask 3666 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0. 3667 */ 3668 iscsit_thread_reschedule(conn); 3669 3670 /* 3671 * mode == 1 signals iscsi_target_tx_thread() usage. 3672 * mode == 0 signals iscsi_target_rx_thread() usage. 3673 */ 3674 if (mode == 1) { 3675 if (!conn->conn_tx_reset_cpumask) 3676 return; 3677 } else { 3678 if (!conn->conn_rx_reset_cpumask) 3679 return; 3680 } 3681 3682 /* 3683 * Update the CPU mask for this single kthread so that 3684 * both TX and RX kthreads are scheduled to run on the 3685 * same CPU. 3686 */ 3687 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3688 if (mode == 1) 3689 conn->conn_tx_reset_cpumask = 0; 3690 else 3691 conn->conn_rx_reset_cpumask = 0; 3692 } 3693 EXPORT_SYMBOL(iscsit_thread_check_cpumask); 3694 3695 int 3696 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3697 { 3698 int ret; 3699 3700 switch (state) { 3701 case ISTATE_SEND_R2T: 3702 ret = iscsit_send_r2t(cmd, conn); 3703 if (ret < 0) 3704 goto err; 3705 break; 3706 case ISTATE_REMOVE: 3707 spin_lock_bh(&conn->cmd_lock); 3708 list_del_init(&cmd->i_conn_node); 3709 spin_unlock_bh(&conn->cmd_lock); 3710 3711 iscsit_free_cmd(cmd, false); 3712 break; 3713 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3714 iscsit_mod_nopin_response_timer(conn); 3715 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3716 if (ret < 0) 3717 goto err; 3718 break; 3719 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3720 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3721 if (ret < 0) 3722 goto err; 3723 break; 3724 default: 3725 pr_err("Unknown Opcode: 0x%02x ITT:" 3726 " 0x%08x, i_state: %d on CID: %hu\n", 3727 cmd->iscsi_opcode, cmd->init_task_tag, state, 3728 conn->cid); 3729 goto err; 3730 } 3731 3732 return 0; 3733 3734 err: 3735 return -1; 3736 } 3737 EXPORT_SYMBOL(iscsit_immediate_queue); 3738 3739 static int 3740 iscsit_handle_immediate_queue(struct iscsit_conn *conn) 3741 { 3742 struct iscsit_transport *t = conn->conn_transport; 3743 struct iscsi_queue_req *qr; 3744 struct iscsit_cmd *cmd; 3745 u8 state; 3746 int ret; 3747 3748 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3749 atomic_set(&conn->check_immediate_queue, 0); 3750 cmd = qr->cmd; 3751 state = qr->state; 3752 kmem_cache_free(lio_qr_cache, qr); 3753 3754 ret = t->iscsit_immediate_queue(conn, cmd, state); 3755 if (ret < 0) 3756 return ret; 3757 } 3758 3759 return 0; 3760 } 3761 3762 int 3763 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3764 { 3765 int ret; 3766 3767 check_rsp_state: 3768 switch (state) { 3769 case ISTATE_SEND_DATAIN: 3770 ret = iscsit_send_datain(cmd, conn); 3771 if (ret < 0) 3772 goto err; 3773 else if (!ret) 3774 /* more drs */ 3775 goto check_rsp_state; 3776 else if (ret == 1) { 3777 /* all done */ 3778 spin_lock_bh(&cmd->istate_lock); 3779 cmd->i_state = ISTATE_SENT_STATUS; 3780 spin_unlock_bh(&cmd->istate_lock); 3781 3782 if (atomic_read(&conn->check_immediate_queue)) 3783 return 1; 3784 3785 return 0; 3786 } else if (ret == 2) { 3787 /* Still must send status, 3788 SCF_TRANSPORT_TASK_SENSE was set */ 3789 spin_lock_bh(&cmd->istate_lock); 3790 cmd->i_state = ISTATE_SEND_STATUS; 3791 spin_unlock_bh(&cmd->istate_lock); 3792 state = ISTATE_SEND_STATUS; 3793 goto check_rsp_state; 3794 } 3795 3796 break; 3797 case ISTATE_SEND_STATUS: 3798 case ISTATE_SEND_STATUS_RECOVERY: 3799 ret = iscsit_send_response(cmd, conn); 3800 break; 3801 case ISTATE_SEND_LOGOUTRSP: 3802 ret = iscsit_send_logout(cmd, conn); 3803 break; 3804 case ISTATE_SEND_ASYNCMSG: 3805 ret = iscsit_send_conn_drop_async_message( 3806 cmd, conn); 3807 break; 3808 case ISTATE_SEND_NOPIN: 3809 ret = iscsit_send_nopin(cmd, conn); 3810 break; 3811 case ISTATE_SEND_REJECT: 3812 ret = iscsit_send_reject(cmd, conn); 3813 break; 3814 case ISTATE_SEND_TASKMGTRSP: 3815 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3816 if (ret != 0) 3817 break; 3818 ret = iscsit_tmr_post_handler(cmd, conn); 3819 if (ret != 0) 3820 iscsit_fall_back_to_erl0(conn->sess); 3821 break; 3822 case ISTATE_SEND_TEXTRSP: 3823 ret = iscsit_send_text_rsp(cmd, conn); 3824 break; 3825 default: 3826 pr_err("Unknown Opcode: 0x%02x ITT:" 3827 " 0x%08x, i_state: %d on CID: %hu\n", 3828 cmd->iscsi_opcode, cmd->init_task_tag, 3829 state, conn->cid); 3830 goto err; 3831 } 3832 if (ret < 0) 3833 goto err; 3834 3835 switch (state) { 3836 case ISTATE_SEND_LOGOUTRSP: 3837 if (!iscsit_logout_post_handler(cmd, conn)) 3838 return -ECONNRESET; 3839 fallthrough; 3840 case ISTATE_SEND_STATUS: 3841 case ISTATE_SEND_ASYNCMSG: 3842 case ISTATE_SEND_NOPIN: 3843 case ISTATE_SEND_STATUS_RECOVERY: 3844 case ISTATE_SEND_TEXTRSP: 3845 case ISTATE_SEND_TASKMGTRSP: 3846 case ISTATE_SEND_REJECT: 3847 spin_lock_bh(&cmd->istate_lock); 3848 cmd->i_state = ISTATE_SENT_STATUS; 3849 spin_unlock_bh(&cmd->istate_lock); 3850 break; 3851 default: 3852 pr_err("Unknown Opcode: 0x%02x ITT:" 3853 " 0x%08x, i_state: %d on CID: %hu\n", 3854 cmd->iscsi_opcode, cmd->init_task_tag, 3855 cmd->i_state, conn->cid); 3856 goto err; 3857 } 3858 3859 if (atomic_read(&conn->check_immediate_queue)) 3860 return 1; 3861 3862 return 0; 3863 3864 err: 3865 return -1; 3866 } 3867 EXPORT_SYMBOL(iscsit_response_queue); 3868 3869 static int iscsit_handle_response_queue(struct iscsit_conn *conn) 3870 { 3871 struct iscsit_transport *t = conn->conn_transport; 3872 struct iscsi_queue_req *qr; 3873 struct iscsit_cmd *cmd; 3874 u8 state; 3875 int ret; 3876 3877 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3878 cmd = qr->cmd; 3879 state = qr->state; 3880 kmem_cache_free(lio_qr_cache, qr); 3881 3882 ret = t->iscsit_response_queue(conn, cmd, state); 3883 if (ret == 1 || ret < 0) 3884 return ret; 3885 } 3886 3887 return 0; 3888 } 3889 3890 int iscsi_target_tx_thread(void *arg) 3891 { 3892 int ret = 0; 3893 struct iscsit_conn *conn = arg; 3894 bool conn_freed = false; 3895 3896 /* 3897 * Allow ourselves to be interrupted by SIGINT so that a 3898 * connection recovery / failure event can be triggered externally. 3899 */ 3900 allow_signal(SIGINT); 3901 3902 while (!kthread_should_stop()) { 3903 /* 3904 * Ensure that both TX and RX per connection kthreads 3905 * are scheduled to run on the same CPU. 3906 */ 3907 iscsit_thread_check_cpumask(conn, current, 1); 3908 3909 wait_event_interruptible(conn->queues_wq, 3910 !iscsit_conn_all_queues_empty(conn)); 3911 3912 if (signal_pending(current)) 3913 goto transport_err; 3914 3915 get_immediate: 3916 ret = iscsit_handle_immediate_queue(conn); 3917 if (ret < 0) 3918 goto transport_err; 3919 3920 ret = iscsit_handle_response_queue(conn); 3921 if (ret == 1) { 3922 goto get_immediate; 3923 } else if (ret == -ECONNRESET) { 3924 conn_freed = true; 3925 goto out; 3926 } else if (ret < 0) { 3927 goto transport_err; 3928 } 3929 } 3930 3931 transport_err: 3932 /* 3933 * Avoid the normal connection failure code-path if this connection 3934 * is still within LOGIN mode, and iscsi_np process context is 3935 * responsible for cleaning up the early connection failure. 3936 */ 3937 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3938 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3939 out: 3940 if (!conn_freed) { 3941 while (!kthread_should_stop()) { 3942 msleep(100); 3943 } 3944 } 3945 return 0; 3946 } 3947 3948 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf) 3949 { 3950 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3951 struct iscsit_cmd *cmd; 3952 int ret = 0; 3953 3954 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3955 case ISCSI_OP_SCSI_CMD: 3956 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3957 if (!cmd) 3958 goto reject; 3959 3960 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3961 break; 3962 case ISCSI_OP_SCSI_DATA_OUT: 3963 ret = iscsit_handle_data_out(conn, buf); 3964 break; 3965 case ISCSI_OP_NOOP_OUT: 3966 cmd = NULL; 3967 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3968 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3969 if (!cmd) 3970 goto reject; 3971 } 3972 ret = iscsit_handle_nop_out(conn, cmd, buf); 3973 break; 3974 case ISCSI_OP_SCSI_TMFUNC: 3975 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3976 if (!cmd) 3977 goto reject; 3978 3979 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3980 break; 3981 case ISCSI_OP_TEXT: 3982 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3983 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3984 if (!cmd) 3985 goto reject; 3986 } else { 3987 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3988 if (!cmd) 3989 goto reject; 3990 } 3991 3992 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3993 break; 3994 case ISCSI_OP_LOGOUT: 3995 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3996 if (!cmd) 3997 goto reject; 3998 3999 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4000 if (ret > 0) 4001 wait_for_completion_timeout(&conn->conn_logout_comp, 4002 SECONDS_FOR_LOGOUT_COMP * HZ); 4003 break; 4004 case ISCSI_OP_SNACK: 4005 ret = iscsit_handle_snack(conn, buf); 4006 break; 4007 default: 4008 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4009 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4010 pr_err("Cannot recover from unknown" 4011 " opcode while ERL=0, closing iSCSI connection.\n"); 4012 return -1; 4013 } 4014 pr_err("Unable to recover from unknown opcode while OFMarker=No," 4015 " closing iSCSI connection.\n"); 4016 ret = -1; 4017 break; 4018 } 4019 4020 return ret; 4021 reject: 4022 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4023 } 4024 4025 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn) 4026 { 4027 bool ret; 4028 4029 spin_lock_bh(&conn->state_lock); 4030 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 4031 spin_unlock_bh(&conn->state_lock); 4032 4033 return ret; 4034 } 4035 4036 static void iscsit_get_rx_pdu(struct iscsit_conn *conn) 4037 { 4038 int ret; 4039 u8 *buffer, opcode; 4040 u32 checksum = 0, digest = 0; 4041 struct kvec iov; 4042 4043 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 4044 if (!buffer) 4045 return; 4046 4047 while (!kthread_should_stop()) { 4048 /* 4049 * Ensure that both TX and RX per connection kthreads 4050 * are scheduled to run on the same CPU. 4051 */ 4052 iscsit_thread_check_cpumask(conn, current, 0); 4053 4054 memset(&iov, 0, sizeof(struct kvec)); 4055 4056 iov.iov_base = buffer; 4057 iov.iov_len = ISCSI_HDR_LEN; 4058 4059 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4060 if (ret != ISCSI_HDR_LEN) { 4061 iscsit_rx_thread_wait_for_tcp(conn); 4062 break; 4063 } 4064 4065 if (conn->conn_ops->HeaderDigest) { 4066 iov.iov_base = &digest; 4067 iov.iov_len = ISCSI_CRC_LEN; 4068 4069 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4070 if (ret != ISCSI_CRC_LEN) { 4071 iscsit_rx_thread_wait_for_tcp(conn); 4072 break; 4073 } 4074 4075 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 4076 ISCSI_HDR_LEN, 0, NULL, 4077 &checksum); 4078 4079 if (digest != checksum) { 4080 pr_err("HeaderDigest CRC32C failed," 4081 " received 0x%08x, computed 0x%08x\n", 4082 digest, checksum); 4083 /* 4084 * Set the PDU to 0xff so it will intentionally 4085 * hit default in the switch below. 4086 */ 4087 memset(buffer, 0xff, ISCSI_HDR_LEN); 4088 atomic_long_inc(&conn->sess->conn_digest_errors); 4089 } else { 4090 pr_debug("Got HeaderDigest CRC32C" 4091 " 0x%08x\n", checksum); 4092 } 4093 } 4094 4095 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4096 break; 4097 4098 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4099 4100 if (conn->sess->sess_ops->SessionType && 4101 ((!(opcode & ISCSI_OP_TEXT)) || 4102 (!(opcode & ISCSI_OP_LOGOUT)))) { 4103 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4104 " while in Discovery Session, rejecting.\n", opcode); 4105 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4106 buffer); 4107 break; 4108 } 4109 4110 ret = iscsi_target_rx_opcode(conn, buffer); 4111 if (ret < 0) 4112 break; 4113 } 4114 4115 kfree(buffer); 4116 } 4117 4118 int iscsi_target_rx_thread(void *arg) 4119 { 4120 int rc; 4121 struct iscsit_conn *conn = arg; 4122 bool conn_freed = false; 4123 4124 /* 4125 * Allow ourselves to be interrupted by SIGINT so that a 4126 * connection recovery / failure event can be triggered externally. 4127 */ 4128 allow_signal(SIGINT); 4129 /* 4130 * Wait for iscsi_post_login_handler() to complete before allowing 4131 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4132 */ 4133 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4134 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4135 goto out; 4136 4137 if (!conn->conn_transport->iscsit_get_rx_pdu) 4138 return 0; 4139 4140 conn->conn_transport->iscsit_get_rx_pdu(conn); 4141 4142 if (!signal_pending(current)) 4143 atomic_set(&conn->transport_failed, 1); 4144 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4145 4146 out: 4147 if (!conn_freed) { 4148 while (!kthread_should_stop()) { 4149 msleep(100); 4150 } 4151 } 4152 4153 return 0; 4154 } 4155 4156 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn) 4157 { 4158 LIST_HEAD(tmp_list); 4159 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL; 4160 struct iscsit_session *sess = conn->sess; 4161 /* 4162 * We expect this function to only ever be called from either RX or TX 4163 * thread context via iscsit_close_connection() once the other context 4164 * has been reset -> returned sleeping pre-handler state. 4165 */ 4166 spin_lock_bh(&conn->cmd_lock); 4167 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4168 4169 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4170 struct se_cmd *se_cmd = &cmd->se_cmd; 4171 4172 if (se_cmd->se_tfo != NULL) { 4173 spin_lock_irq(&se_cmd->t_state_lock); 4174 if (se_cmd->transport_state & CMD_T_ABORTED) { 4175 /* 4176 * LIO's abort path owns the cleanup for this, 4177 * so put it back on the list and let 4178 * aborted_task handle it. 4179 */ 4180 list_move_tail(&cmd->i_conn_node, 4181 &conn->conn_cmd_list); 4182 } else { 4183 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4184 } 4185 spin_unlock_irq(&se_cmd->t_state_lock); 4186 } 4187 } 4188 spin_unlock_bh(&conn->cmd_lock); 4189 4190 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4191 list_del_init(&cmd->i_conn_node); 4192 4193 iscsit_increment_maxcmdsn(cmd, sess); 4194 iscsit_free_cmd(cmd, true); 4195 4196 } 4197 } 4198 4199 static void iscsit_stop_timers_for_cmds( 4200 struct iscsit_conn *conn) 4201 { 4202 struct iscsit_cmd *cmd; 4203 4204 spin_lock_bh(&conn->cmd_lock); 4205 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4206 if (cmd->data_direction == DMA_TO_DEVICE) 4207 iscsit_stop_dataout_timer(cmd); 4208 } 4209 spin_unlock_bh(&conn->cmd_lock); 4210 } 4211 4212 int iscsit_close_connection( 4213 struct iscsit_conn *conn) 4214 { 4215 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4216 struct iscsit_session *sess = conn->sess; 4217 4218 pr_debug("Closing iSCSI connection CID %hu on SID:" 4219 " %u\n", conn->cid, sess->sid); 4220 /* 4221 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4222 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4223 * sleeping and the logout response never got sent because the 4224 * connection failed. 4225 * 4226 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4227 * to signal logout response TX interrupt completion. Go ahead and skip 4228 * this for iser since isert_rx_opcode() does not wait on logout failure, 4229 * and to avoid iscsit_conn pointer dereference in iser-target code. 4230 */ 4231 if (!conn->conn_transport->rdma_shutdown) 4232 complete(&conn->conn_logout_comp); 4233 4234 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4235 if (conn->tx_thread && 4236 cmpxchg(&conn->tx_thread_active, true, false)) { 4237 send_sig(SIGINT, conn->tx_thread, 1); 4238 kthread_stop(conn->tx_thread); 4239 } 4240 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4241 if (conn->rx_thread && 4242 cmpxchg(&conn->rx_thread_active, true, false)) { 4243 send_sig(SIGINT, conn->rx_thread, 1); 4244 kthread_stop(conn->rx_thread); 4245 } 4246 } 4247 4248 spin_lock(&iscsit_global->ts_bitmap_lock); 4249 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4250 get_order(1)); 4251 spin_unlock(&iscsit_global->ts_bitmap_lock); 4252 4253 iscsit_stop_timers_for_cmds(conn); 4254 iscsit_stop_nopin_response_timer(conn); 4255 iscsit_stop_nopin_timer(conn); 4256 4257 if (conn->conn_transport->iscsit_wait_conn) 4258 conn->conn_transport->iscsit_wait_conn(conn); 4259 4260 /* 4261 * During Connection recovery drop unacknowledged out of order 4262 * commands for this connection, and prepare the other commands 4263 * for reallegiance. 4264 * 4265 * During normal operation clear the out of order commands (but 4266 * do not free the struct iscsi_ooo_cmdsn's) and release all 4267 * struct iscsit_cmds. 4268 */ 4269 if (atomic_read(&conn->connection_recovery)) { 4270 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4271 iscsit_prepare_cmds_for_reallegiance(conn); 4272 } else { 4273 iscsit_clear_ooo_cmdsns_for_conn(conn); 4274 iscsit_release_commands_from_conn(conn); 4275 } 4276 iscsit_free_queue_reqs_for_conn(conn); 4277 4278 /* 4279 * Handle decrementing session or connection usage count if 4280 * a logout response was not able to be sent because the 4281 * connection failed. Fall back to Session Recovery here. 4282 */ 4283 if (atomic_read(&conn->conn_logout_remove)) { 4284 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4285 iscsit_dec_conn_usage_count(conn); 4286 iscsit_dec_session_usage_count(sess); 4287 } 4288 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4289 iscsit_dec_conn_usage_count(conn); 4290 4291 atomic_set(&conn->conn_logout_remove, 0); 4292 atomic_set(&sess->session_reinstatement, 0); 4293 atomic_set(&sess->session_fall_back_to_erl0, 1); 4294 } 4295 4296 spin_lock_bh(&sess->conn_lock); 4297 list_del(&conn->conn_list); 4298 4299 /* 4300 * Attempt to let the Initiator know this connection failed by 4301 * sending an Connection Dropped Async Message on another 4302 * active connection. 4303 */ 4304 if (atomic_read(&conn->connection_recovery)) 4305 iscsit_build_conn_drop_async_message(conn); 4306 4307 spin_unlock_bh(&sess->conn_lock); 4308 4309 /* 4310 * If connection reinstatement is being performed on this connection, 4311 * up the connection reinstatement semaphore that is being blocked on 4312 * in iscsit_cause_connection_reinstatement(). 4313 */ 4314 spin_lock_bh(&conn->state_lock); 4315 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4316 spin_unlock_bh(&conn->state_lock); 4317 complete(&conn->conn_wait_comp); 4318 wait_for_completion(&conn->conn_post_wait_comp); 4319 spin_lock_bh(&conn->state_lock); 4320 } 4321 4322 /* 4323 * If connection reinstatement is being performed on this connection 4324 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4325 * connection wait rcfr semaphore that is being blocked on 4326 * an iscsit_connection_reinstatement_rcfr(). 4327 */ 4328 if (atomic_read(&conn->connection_wait_rcfr)) { 4329 spin_unlock_bh(&conn->state_lock); 4330 complete(&conn->conn_wait_rcfr_comp); 4331 wait_for_completion(&conn->conn_post_wait_comp); 4332 spin_lock_bh(&conn->state_lock); 4333 } 4334 atomic_set(&conn->connection_reinstatement, 1); 4335 spin_unlock_bh(&conn->state_lock); 4336 4337 /* 4338 * If any other processes are accessing this connection pointer we 4339 * must wait until they have completed. 4340 */ 4341 iscsit_check_conn_usage_count(conn); 4342 4343 ahash_request_free(conn->conn_tx_hash); 4344 if (conn->conn_rx_hash) { 4345 struct crypto_ahash *tfm; 4346 4347 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4348 ahash_request_free(conn->conn_rx_hash); 4349 crypto_free_ahash(tfm); 4350 } 4351 4352 if (conn->sock) 4353 sock_release(conn->sock); 4354 4355 if (conn->conn_transport->iscsit_free_conn) 4356 conn->conn_transport->iscsit_free_conn(conn); 4357 4358 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4359 conn->conn_state = TARG_CONN_STATE_FREE; 4360 iscsit_free_conn(conn); 4361 4362 spin_lock_bh(&sess->conn_lock); 4363 atomic_dec(&sess->nconn); 4364 pr_debug("Decremented iSCSI connection count to %hu from node:" 4365 " %s\n", atomic_read(&sess->nconn), 4366 sess->sess_ops->InitiatorName); 4367 /* 4368 * Make sure that if one connection fails in an non ERL=2 iSCSI 4369 * Session that they all fail. 4370 */ 4371 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4372 !atomic_read(&sess->session_logout)) 4373 atomic_set(&sess->session_fall_back_to_erl0, 1); 4374 4375 /* 4376 * If this was not the last connection in the session, and we are 4377 * performing session reinstatement or falling back to ERL=0, call 4378 * iscsit_stop_session() without sleeping to shutdown the other 4379 * active connections. 4380 */ 4381 if (atomic_read(&sess->nconn)) { 4382 if (!atomic_read(&sess->session_reinstatement) && 4383 !atomic_read(&sess->session_fall_back_to_erl0)) { 4384 spin_unlock_bh(&sess->conn_lock); 4385 return 0; 4386 } 4387 if (!atomic_read(&sess->session_stop_active)) { 4388 atomic_set(&sess->session_stop_active, 1); 4389 spin_unlock_bh(&sess->conn_lock); 4390 iscsit_stop_session(sess, 0, 0); 4391 return 0; 4392 } 4393 spin_unlock_bh(&sess->conn_lock); 4394 return 0; 4395 } 4396 4397 /* 4398 * If this was the last connection in the session and one of the 4399 * following is occurring: 4400 * 4401 * Session Reinstatement is not being performed, and are falling back 4402 * to ERL=0 call iscsit_close_session(). 4403 * 4404 * Session Logout was requested. iscsit_close_session() will be called 4405 * elsewhere. 4406 * 4407 * Session Continuation is not being performed, start the Time2Retain 4408 * handler and check if sleep_on_sess_wait_sem is active. 4409 */ 4410 if (!atomic_read(&sess->session_reinstatement) && 4411 atomic_read(&sess->session_fall_back_to_erl0)) { 4412 spin_unlock_bh(&sess->conn_lock); 4413 complete_all(&sess->session_wait_comp); 4414 iscsit_close_session(sess, true); 4415 4416 return 0; 4417 } else if (atomic_read(&sess->session_logout)) { 4418 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4419 sess->session_state = TARG_SESS_STATE_FREE; 4420 4421 if (atomic_read(&sess->session_close)) { 4422 spin_unlock_bh(&sess->conn_lock); 4423 complete_all(&sess->session_wait_comp); 4424 iscsit_close_session(sess, true); 4425 } else { 4426 spin_unlock_bh(&sess->conn_lock); 4427 } 4428 4429 return 0; 4430 } else { 4431 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4432 sess->session_state = TARG_SESS_STATE_FAILED; 4433 4434 if (!atomic_read(&sess->session_continuation)) 4435 iscsit_start_time2retain_handler(sess); 4436 4437 if (atomic_read(&sess->session_close)) { 4438 spin_unlock_bh(&sess->conn_lock); 4439 complete_all(&sess->session_wait_comp); 4440 iscsit_close_session(sess, true); 4441 } else { 4442 spin_unlock_bh(&sess->conn_lock); 4443 } 4444 4445 return 0; 4446 } 4447 } 4448 4449 /* 4450 * If the iSCSI Session for the iSCSI Initiator Node exists, 4451 * forcefully shutdown the iSCSI NEXUS. 4452 */ 4453 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) 4454 { 4455 struct iscsi_portal_group *tpg = sess->tpg; 4456 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4457 4458 if (atomic_read(&sess->nconn)) { 4459 pr_err("%d connection(s) still exist for iSCSI session" 4460 " to %s\n", atomic_read(&sess->nconn), 4461 sess->sess_ops->InitiatorName); 4462 BUG(); 4463 } 4464 4465 spin_lock_bh(&se_tpg->session_lock); 4466 atomic_set(&sess->session_logout, 1); 4467 atomic_set(&sess->session_reinstatement, 1); 4468 iscsit_stop_time2retain_timer(sess); 4469 spin_unlock_bh(&se_tpg->session_lock); 4470 4471 /* 4472 * transport_deregister_session_configfs() will clear the 4473 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4474 * can be setting it again with __transport_register_session() in 4475 * iscsi_post_login_handler() again after the iscsit_stop_session() 4476 * completes in iscsi_np context. 4477 */ 4478 transport_deregister_session_configfs(sess->se_sess); 4479 4480 /* 4481 * If any other processes are accessing this session pointer we must 4482 * wait until they have completed. If we are in an interrupt (the 4483 * time2retain handler) and contain and active session usage count we 4484 * restart the timer and exit. 4485 */ 4486 if (iscsit_check_session_usage_count(sess, can_sleep)) { 4487 atomic_set(&sess->session_logout, 0); 4488 iscsit_start_time2retain_handler(sess); 4489 return 0; 4490 } 4491 4492 transport_deregister_session(sess->se_sess); 4493 4494 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4495 iscsit_free_connection_recovery_entries(sess); 4496 4497 iscsit_free_all_ooo_cmdsns(sess); 4498 4499 spin_lock_bh(&se_tpg->session_lock); 4500 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4501 sess->session_state = TARG_SESS_STATE_FREE; 4502 pr_debug("Released iSCSI session from node: %s\n", 4503 sess->sess_ops->InitiatorName); 4504 tpg->nsessions--; 4505 if (tpg->tpg_tiqn) 4506 tpg->tpg_tiqn->tiqn_nsessions--; 4507 4508 pr_debug("Decremented number of active iSCSI Sessions on" 4509 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4510 4511 ida_free(&sess_ida, sess->session_index); 4512 kfree(sess->sess_ops); 4513 sess->sess_ops = NULL; 4514 spin_unlock_bh(&se_tpg->session_lock); 4515 4516 kfree(sess); 4517 return 0; 4518 } 4519 4520 static void iscsit_logout_post_handler_closesession( 4521 struct iscsit_conn *conn) 4522 { 4523 struct iscsit_session *sess = conn->sess; 4524 int sleep = 1; 4525 /* 4526 * Traditional iscsi/tcp will invoke this logic from TX thread 4527 * context during session logout, so clear tx_thread_active and 4528 * sleep if iscsit_close_connection() has not already occured. 4529 * 4530 * Since iser-target invokes this logic from it's own workqueue, 4531 * always sleep waiting for RX/TX thread shutdown to complete 4532 * within iscsit_close_connection(). 4533 */ 4534 if (!conn->conn_transport->rdma_shutdown) { 4535 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4536 if (!sleep) 4537 return; 4538 } 4539 4540 atomic_set(&conn->conn_logout_remove, 0); 4541 complete(&conn->conn_logout_comp); 4542 4543 iscsit_dec_conn_usage_count(conn); 4544 atomic_set(&sess->session_close, 1); 4545 iscsit_stop_session(sess, sleep, sleep); 4546 iscsit_dec_session_usage_count(sess); 4547 } 4548 4549 static void iscsit_logout_post_handler_samecid( 4550 struct iscsit_conn *conn) 4551 { 4552 int sleep = 1; 4553 4554 if (!conn->conn_transport->rdma_shutdown) { 4555 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4556 if (!sleep) 4557 return; 4558 } 4559 4560 atomic_set(&conn->conn_logout_remove, 0); 4561 complete(&conn->conn_logout_comp); 4562 4563 iscsit_cause_connection_reinstatement(conn, sleep); 4564 iscsit_dec_conn_usage_count(conn); 4565 } 4566 4567 static void iscsit_logout_post_handler_diffcid( 4568 struct iscsit_conn *conn, 4569 u16 cid) 4570 { 4571 struct iscsit_conn *l_conn; 4572 struct iscsit_session *sess = conn->sess; 4573 bool conn_found = false; 4574 4575 if (!sess) 4576 return; 4577 4578 spin_lock_bh(&sess->conn_lock); 4579 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4580 if (l_conn->cid == cid) { 4581 iscsit_inc_conn_usage_count(l_conn); 4582 conn_found = true; 4583 break; 4584 } 4585 } 4586 spin_unlock_bh(&sess->conn_lock); 4587 4588 if (!conn_found) 4589 return; 4590 4591 if (l_conn->sock) 4592 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4593 4594 spin_lock_bh(&l_conn->state_lock); 4595 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4596 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4597 spin_unlock_bh(&l_conn->state_lock); 4598 4599 iscsit_cause_connection_reinstatement(l_conn, 1); 4600 iscsit_dec_conn_usage_count(l_conn); 4601 } 4602 4603 /* 4604 * Return of 0 causes the TX thread to restart. 4605 */ 4606 int iscsit_logout_post_handler( 4607 struct iscsit_cmd *cmd, 4608 struct iscsit_conn *conn) 4609 { 4610 int ret = 0; 4611 4612 switch (cmd->logout_reason) { 4613 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4614 switch (cmd->logout_response) { 4615 case ISCSI_LOGOUT_SUCCESS: 4616 case ISCSI_LOGOUT_CLEANUP_FAILED: 4617 default: 4618 iscsit_logout_post_handler_closesession(conn); 4619 break; 4620 } 4621 break; 4622 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4623 if (conn->cid == cmd->logout_cid) { 4624 switch (cmd->logout_response) { 4625 case ISCSI_LOGOUT_SUCCESS: 4626 case ISCSI_LOGOUT_CLEANUP_FAILED: 4627 default: 4628 iscsit_logout_post_handler_samecid(conn); 4629 break; 4630 } 4631 } else { 4632 switch (cmd->logout_response) { 4633 case ISCSI_LOGOUT_SUCCESS: 4634 iscsit_logout_post_handler_diffcid(conn, 4635 cmd->logout_cid); 4636 break; 4637 case ISCSI_LOGOUT_CID_NOT_FOUND: 4638 case ISCSI_LOGOUT_CLEANUP_FAILED: 4639 default: 4640 break; 4641 } 4642 ret = 1; 4643 } 4644 break; 4645 case ISCSI_LOGOUT_REASON_RECOVERY: 4646 switch (cmd->logout_response) { 4647 case ISCSI_LOGOUT_SUCCESS: 4648 case ISCSI_LOGOUT_CID_NOT_FOUND: 4649 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4650 case ISCSI_LOGOUT_CLEANUP_FAILED: 4651 default: 4652 break; 4653 } 4654 ret = 1; 4655 break; 4656 default: 4657 break; 4658 4659 } 4660 return ret; 4661 } 4662 EXPORT_SYMBOL(iscsit_logout_post_handler); 4663 4664 void iscsit_fail_session(struct iscsit_session *sess) 4665 { 4666 struct iscsit_conn *conn; 4667 4668 spin_lock_bh(&sess->conn_lock); 4669 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4670 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4671 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4672 } 4673 spin_unlock_bh(&sess->conn_lock); 4674 4675 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4676 sess->session_state = TARG_SESS_STATE_FAILED; 4677 } 4678 4679 void iscsit_stop_session( 4680 struct iscsit_session *sess, 4681 int session_sleep, 4682 int connection_sleep) 4683 { 4684 u16 conn_count = atomic_read(&sess->nconn); 4685 struct iscsit_conn *conn, *conn_tmp = NULL; 4686 int is_last; 4687 4688 spin_lock_bh(&sess->conn_lock); 4689 4690 if (connection_sleep) { 4691 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4692 conn_list) { 4693 if (conn_count == 0) 4694 break; 4695 4696 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4697 is_last = 1; 4698 } else { 4699 iscsit_inc_conn_usage_count(conn_tmp); 4700 is_last = 0; 4701 } 4702 iscsit_inc_conn_usage_count(conn); 4703 4704 spin_unlock_bh(&sess->conn_lock); 4705 iscsit_cause_connection_reinstatement(conn, 1); 4706 spin_lock_bh(&sess->conn_lock); 4707 4708 iscsit_dec_conn_usage_count(conn); 4709 if (is_last == 0) 4710 iscsit_dec_conn_usage_count(conn_tmp); 4711 conn_count--; 4712 } 4713 } else { 4714 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4715 iscsit_cause_connection_reinstatement(conn, 0); 4716 } 4717 4718 if (session_sleep && atomic_read(&sess->nconn)) { 4719 spin_unlock_bh(&sess->conn_lock); 4720 wait_for_completion(&sess->session_wait_comp); 4721 } else 4722 spin_unlock_bh(&sess->conn_lock); 4723 } 4724 4725 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4726 { 4727 struct iscsit_session *sess; 4728 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4729 struct se_session *se_sess, *se_sess_tmp; 4730 LIST_HEAD(free_list); 4731 int session_count = 0; 4732 4733 spin_lock_bh(&se_tpg->session_lock); 4734 if (tpg->nsessions && !force) { 4735 spin_unlock_bh(&se_tpg->session_lock); 4736 return -1; 4737 } 4738 4739 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4740 sess_list) { 4741 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4742 4743 spin_lock(&sess->conn_lock); 4744 if (atomic_read(&sess->session_fall_back_to_erl0) || 4745 atomic_read(&sess->session_logout) || 4746 atomic_read(&sess->session_close) || 4747 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4748 spin_unlock(&sess->conn_lock); 4749 continue; 4750 } 4751 iscsit_inc_session_usage_count(sess); 4752 atomic_set(&sess->session_reinstatement, 1); 4753 atomic_set(&sess->session_fall_back_to_erl0, 1); 4754 atomic_set(&sess->session_close, 1); 4755 spin_unlock(&sess->conn_lock); 4756 4757 list_move_tail(&se_sess->sess_list, &free_list); 4758 } 4759 spin_unlock_bh(&se_tpg->session_lock); 4760 4761 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4762 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4763 4764 list_del_init(&se_sess->sess_list); 4765 iscsit_stop_session(sess, 1, 1); 4766 iscsit_dec_session_usage_count(sess); 4767 session_count++; 4768 } 4769 4770 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4771 " Group: %hu\n", session_count, tpg->tpgt); 4772 return 0; 4773 } 4774 4775 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4776 MODULE_VERSION("4.1.x"); 4777 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4778 MODULE_LICENSE("GPL"); 4779 4780 module_init(iscsi_target_init_module); 4781 module_exit(iscsi_target_cleanup_module); 4782