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