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); 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 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0) 1169 return iscsit_add_reject_cmd(cmd, 1170 ISCSI_REASON_WAITING_FOR_LOGOUT, buf); 1171 1172 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1173 scsilun_to_int(&hdr->lun)); 1174 if (cmd->sense_reason) 1175 goto attach_cmd; 1176 1177 /* only used for printks or comparing with ->ref_task_tag */ 1178 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1179 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1180 if (cmd->sense_reason) { 1181 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1182 return iscsit_add_reject_cmd(cmd, 1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1184 } 1185 1186 goto attach_cmd; 1187 } 1188 1189 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1190 return iscsit_add_reject_cmd(cmd, 1191 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1192 } 1193 1194 attach_cmd: 1195 spin_lock_bh(&conn->cmd_lock); 1196 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1197 spin_unlock_bh(&conn->cmd_lock); 1198 /* 1199 * Check if we need to delay processing because of ALUA 1200 * Active/NonOptimized primary access state.. 1201 */ 1202 core_alua_check_nonop_delay(&cmd->se_cmd); 1203 1204 return 0; 1205 } 1206 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1207 1208 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd) 1209 { 1210 iscsit_set_dataout_sequence_values(cmd); 1211 1212 spin_lock_bh(&cmd->dataout_timeout_lock); 1213 iscsit_start_dataout_timer(cmd, cmd->conn); 1214 spin_unlock_bh(&cmd->dataout_timeout_lock); 1215 } 1216 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); 1217 1218 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1219 struct iscsi_scsi_req *hdr) 1220 { 1221 int cmdsn_ret = 0; 1222 /* 1223 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1224 * the Immediate Bit is not set, and no Immediate 1225 * Data is attached. 1226 * 1227 * A PDU/CmdSN carrying Immediate Data can only 1228 * be processed after the DataCRC has passed. 1229 * If the DataCRC fails, the CmdSN MUST NOT 1230 * be acknowledged. (See below) 1231 */ 1232 if (!cmd->immediate_data) { 1233 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1234 (unsigned char *)hdr, hdr->cmdsn); 1235 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1236 return -1; 1237 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1238 target_put_sess_cmd(&cmd->se_cmd); 1239 return 0; 1240 } 1241 } 1242 1243 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1244 1245 /* 1246 * If no Immediate Data is attached, it's OK to return now. 1247 */ 1248 if (!cmd->immediate_data) { 1249 if (!cmd->sense_reason && cmd->unsolicited_data) 1250 iscsit_set_unsolicited_dataout(cmd); 1251 if (!cmd->sense_reason) 1252 return 0; 1253 1254 target_put_sess_cmd(&cmd->se_cmd); 1255 return 0; 1256 } 1257 1258 /* 1259 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1260 * execution. These exceptions are processed in CmdSN order using 1261 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1262 */ 1263 if (cmd->sense_reason) 1264 return 1; 1265 /* 1266 * Call directly into transport_generic_new_cmd() to perform 1267 * the backend memory allocation. 1268 */ 1269 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1270 if (cmd->sense_reason) 1271 return 1; 1272 1273 return 0; 1274 } 1275 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1276 1277 static int 1278 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1279 bool dump_payload) 1280 { 1281 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1282 int rc; 1283 1284 /* 1285 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1286 */ 1287 if (dump_payload) { 1288 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, 1289 cmd->first_burst_len); 1290 1291 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", 1292 cmd->se_cmd.data_length, cmd->write_data_done, 1293 cmd->first_burst_len, length); 1294 rc = iscsit_dump_data_payload(cmd->conn, length, 1); 1295 pr_debug("Finished dumping immediate data\n"); 1296 if (rc < 0) 1297 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; 1298 } else { 1299 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1300 cmd->first_burst_len); 1301 } 1302 1303 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1304 /* 1305 * A PDU/CmdSN carrying Immediate Data passed 1306 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1307 * Immediate Bit is not set. 1308 */ 1309 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1310 (unsigned char *)hdr, hdr->cmdsn); 1311 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1312 return -1; 1313 1314 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1315 target_put_sess_cmd(&cmd->se_cmd); 1316 1317 return 0; 1318 } else if (cmd->unsolicited_data) 1319 iscsit_set_unsolicited_dataout(cmd); 1320 1321 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1322 /* 1323 * Immediate Data failed DataCRC and ERL>=1, 1324 * silently drop this PDU and let the initiator 1325 * plug the CmdSN gap. 1326 * 1327 * FIXME: Send Unsolicited NOPIN with reserved 1328 * TTT here to help the initiator figure out 1329 * the missing CmdSN, although they should be 1330 * intelligent enough to determine the missing 1331 * CmdSN and issue a retry to plug the sequence. 1332 */ 1333 cmd->i_state = ISTATE_REMOVE; 1334 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1335 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1336 return -1; 1337 1338 return 0; 1339 } 1340 1341 static int 1342 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1343 unsigned char *buf) 1344 { 1345 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1346 int rc, immed_data; 1347 bool dump_payload = false; 1348 1349 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1350 if (rc < 0) 1351 return 0; 1352 /* 1353 * Allocation iovecs needed for struct socket operations for 1354 * traditional iSCSI block I/O. 1355 */ 1356 if (iscsit_allocate_iovecs(cmd) < 0) { 1357 return iscsit_reject_cmd(cmd, 1358 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1359 } 1360 immed_data = cmd->immediate_data; 1361 1362 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1363 if (rc < 0) 1364 return rc; 1365 else if (rc > 0) 1366 dump_payload = true; 1367 1368 if (!immed_data) 1369 return 0; 1370 1371 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1372 } 1373 1374 static u32 iscsit_do_crypto_hash_sg( 1375 struct ahash_request *hash, 1376 struct iscsi_cmd *cmd, 1377 u32 data_offset, 1378 u32 data_length, 1379 u32 padding, 1380 u8 *pad_bytes) 1381 { 1382 u32 data_crc; 1383 struct scatterlist *sg; 1384 unsigned int page_off; 1385 1386 crypto_ahash_init(hash); 1387 1388 sg = cmd->first_data_sg; 1389 page_off = cmd->first_data_sg_off; 1390 1391 while (data_length) { 1392 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1393 1394 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1395 crypto_ahash_update(hash); 1396 1397 data_length -= cur_len; 1398 page_off = 0; 1399 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1400 sg = sg_next(sg); 1401 } 1402 1403 if (padding) { 1404 struct scatterlist pad_sg; 1405 1406 sg_init_one(&pad_sg, pad_bytes, padding); 1407 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1408 padding); 1409 crypto_ahash_finup(hash); 1410 } else { 1411 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1412 crypto_ahash_final(hash); 1413 } 1414 1415 return data_crc; 1416 } 1417 1418 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1419 const void *buf, u32 payload_length, u32 padding, 1420 const void *pad_bytes, void *data_crc) 1421 { 1422 struct scatterlist sg[2]; 1423 1424 sg_init_table(sg, ARRAY_SIZE(sg)); 1425 sg_set_buf(sg, buf, payload_length); 1426 if (padding) 1427 sg_set_buf(sg + 1, pad_bytes, padding); 1428 1429 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1430 1431 crypto_ahash_digest(hash); 1432 } 1433 1434 int 1435 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1436 struct iscsi_cmd *cmd, u32 payload_length, 1437 bool *success) 1438 { 1439 struct iscsi_data *hdr = buf; 1440 struct se_cmd *se_cmd; 1441 int rc; 1442 1443 /* iSCSI write */ 1444 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1445 1446 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1447 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1448 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1449 payload_length, conn->cid); 1450 1451 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1452 pr_err("Command ITT: 0x%08x received DataOUT after" 1453 " last DataOUT received, dumping payload\n", 1454 cmd->init_task_tag); 1455 return iscsit_dump_data_payload(conn, payload_length, 1); 1456 } 1457 1458 if (cmd->data_direction != DMA_TO_DEVICE) { 1459 pr_err("Command ITT: 0x%08x received DataOUT for a" 1460 " NON-WRITE command.\n", cmd->init_task_tag); 1461 return iscsit_dump_data_payload(conn, payload_length, 1); 1462 } 1463 se_cmd = &cmd->se_cmd; 1464 iscsit_mod_dataout_timer(cmd); 1465 1466 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1467 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1468 be32_to_cpu(hdr->offset), payload_length, 1469 cmd->se_cmd.data_length); 1470 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1471 } 1472 1473 if (cmd->unsolicited_data) { 1474 int dump_unsolicited_data = 0; 1475 1476 if (conn->sess->sess_ops->InitialR2T) { 1477 pr_err("Received unexpected unsolicited data" 1478 " while InitialR2T=Yes, protocol error.\n"); 1479 transport_send_check_condition_and_sense(&cmd->se_cmd, 1480 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1481 return -1; 1482 } 1483 /* 1484 * Special case for dealing with Unsolicited DataOUT 1485 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1486 * failures; 1487 */ 1488 1489 /* Something's amiss if we're not in WRITE_PENDING state... */ 1490 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1491 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1492 dump_unsolicited_data = 1; 1493 1494 if (dump_unsolicited_data) { 1495 /* 1496 * Check if a delayed TASK_ABORTED status needs to 1497 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1498 * received with the unsolicited data out. 1499 */ 1500 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1501 iscsit_stop_dataout_timer(cmd); 1502 1503 return iscsit_dump_data_payload(conn, payload_length, 1); 1504 } 1505 } else { 1506 /* 1507 * For the normal solicited data path: 1508 * 1509 * Check for a delayed TASK_ABORTED status and dump any 1510 * incoming data out payload if one exists. Also, when the 1511 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1512 * data out sequence, we decrement outstanding_r2ts. Once 1513 * outstanding_r2ts reaches zero, go ahead and send the delayed 1514 * TASK_ABORTED status. 1515 */ 1516 if (se_cmd->transport_state & CMD_T_ABORTED) { 1517 if (hdr->flags & ISCSI_FLAG_CMD_FINAL && 1518 --cmd->outstanding_r2ts < 1) 1519 iscsit_stop_dataout_timer(cmd); 1520 1521 return iscsit_dump_data_payload(conn, payload_length, 1); 1522 } 1523 } 1524 /* 1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1526 * within-command recovery checks before receiving the payload. 1527 */ 1528 rc = iscsit_check_pre_dataout(cmd, buf); 1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1530 return 0; 1531 else if (rc == DATAOUT_CANNOT_RECOVER) 1532 return -1; 1533 *success = true; 1534 return 0; 1535 } 1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1537 1538 int 1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1540 struct iscsi_cmd **out_cmd) 1541 { 1542 struct iscsi_data *hdr = buf; 1543 struct iscsi_cmd *cmd; 1544 u32 payload_length = ntoh24(hdr->dlength); 1545 int rc; 1546 bool success = false; 1547 1548 if (!payload_length) { 1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1550 return 0; 1551 } 1552 1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1554 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1555 " MaxXmitDataSegmentLength: %u\n", payload_length, 1556 conn->conn_ops->MaxXmitDataSegmentLength); 1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1558 } 1559 1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1561 if (!cmd) 1562 return 0; 1563 1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1565 1566 if (success) 1567 *out_cmd = cmd; 1568 1569 return rc; 1570 } 1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1572 1573 static int 1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1575 struct iscsi_data *hdr) 1576 { 1577 struct kvec *iov; 1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1579 u32 payload_length; 1580 int iov_ret, data_crc_failed = 0; 1581 1582 payload_length = min_t(u32, cmd->se_cmd.data_length, 1583 ntoh24(hdr->dlength)); 1584 rx_size += payload_length; 1585 iov = &cmd->iov_data[0]; 1586 1587 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, 1588 be32_to_cpu(hdr->offset), payload_length); 1589 if (iov_ret < 0) 1590 return -1; 1591 1592 iov_count += iov_ret; 1593 1594 padding = ((-payload_length) & 3); 1595 if (padding != 0) { 1596 iov[iov_count].iov_base = cmd->pad_bytes; 1597 iov[iov_count++].iov_len = padding; 1598 rx_size += padding; 1599 pr_debug("Receiving %u padding bytes.\n", padding); 1600 } 1601 1602 if (conn->conn_ops->DataDigest) { 1603 iov[iov_count].iov_base = &checksum; 1604 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1605 rx_size += ISCSI_CRC_LEN; 1606 } 1607 1608 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 1609 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1610 1611 iscsit_unmap_iovec(cmd); 1612 1613 if (rx_got != rx_size) 1614 return -1; 1615 1616 if (conn->conn_ops->DataDigest) { 1617 u32 data_crc; 1618 1619 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1620 be32_to_cpu(hdr->offset), 1621 payload_length, padding, 1622 cmd->pad_bytes); 1623 1624 if (checksum != data_crc) { 1625 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1626 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1627 " does not match computed 0x%08x\n", 1628 hdr->itt, hdr->offset, payload_length, 1629 hdr->datasn, checksum, data_crc); 1630 data_crc_failed = 1; 1631 } else { 1632 pr_debug("Got CRC32C DataDigest 0x%08x for" 1633 " %u bytes of Data Out\n", checksum, 1634 payload_length); 1635 } 1636 } 1637 1638 return data_crc_failed; 1639 } 1640 1641 int 1642 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1643 bool data_crc_failed) 1644 { 1645 struct iscsi_conn *conn = cmd->conn; 1646 int rc, ooo_cmdsn; 1647 /* 1648 * Increment post receive data and CRC values or perform 1649 * within-command recovery. 1650 */ 1651 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1652 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1653 return 0; 1654 else if (rc == DATAOUT_SEND_R2T) { 1655 iscsit_set_dataout_sequence_values(cmd); 1656 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1657 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1658 /* 1659 * Handle extra special case for out of order 1660 * Unsolicited Data Out. 1661 */ 1662 spin_lock_bh(&cmd->istate_lock); 1663 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1664 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1665 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1666 spin_unlock_bh(&cmd->istate_lock); 1667 1668 iscsit_stop_dataout_timer(cmd); 1669 if (ooo_cmdsn) 1670 return 0; 1671 target_execute_cmd(&cmd->se_cmd); 1672 return 0; 1673 } else /* DATAOUT_CANNOT_RECOVER */ 1674 return -1; 1675 1676 return 0; 1677 } 1678 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1679 1680 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1681 { 1682 struct iscsi_cmd *cmd = NULL; 1683 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1684 int rc; 1685 bool data_crc_failed = false; 1686 1687 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1688 if (rc < 0) 1689 return 0; 1690 else if (!cmd) 1691 return 0; 1692 1693 rc = iscsit_get_dataout(conn, cmd, hdr); 1694 if (rc < 0) 1695 return rc; 1696 else if (rc > 0) 1697 data_crc_failed = true; 1698 1699 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1700 } 1701 1702 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1703 struct iscsi_nopout *hdr) 1704 { 1705 u32 payload_length = ntoh24(hdr->dlength); 1706 1707 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1708 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1709 if (!cmd) 1710 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1711 (unsigned char *)hdr); 1712 1713 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1714 (unsigned char *)hdr); 1715 } 1716 1717 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1718 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1719 " not set, protocol error.\n"); 1720 if (!cmd) 1721 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1722 (unsigned char *)hdr); 1723 1724 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1725 (unsigned char *)hdr); 1726 } 1727 1728 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1729 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1730 " greater than MaxXmitDataSegmentLength: %u, protocol" 1731 " error.\n", payload_length, 1732 conn->conn_ops->MaxXmitDataSegmentLength); 1733 if (!cmd) 1734 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1735 (unsigned char *)hdr); 1736 1737 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1738 (unsigned char *)hdr); 1739 } 1740 1741 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1742 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1743 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1744 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1745 payload_length); 1746 /* 1747 * This is not a response to a Unsolicited NopIN, which means 1748 * it can either be a NOPOUT ping request (with a valid ITT), 1749 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1750 * Either way, make sure we allocate an struct iscsi_cmd, as both 1751 * can contain ping data. 1752 */ 1753 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1754 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1755 cmd->i_state = ISTATE_SEND_NOPIN; 1756 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1757 1 : 0); 1758 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1759 cmd->targ_xfer_tag = 0xFFFFFFFF; 1760 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1761 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1762 cmd->data_direction = DMA_NONE; 1763 } 1764 1765 return 0; 1766 } 1767 EXPORT_SYMBOL(iscsit_setup_nop_out); 1768 1769 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1770 struct iscsi_nopout *hdr) 1771 { 1772 struct iscsi_cmd *cmd_p = NULL; 1773 int cmdsn_ret = 0; 1774 /* 1775 * Initiator is expecting a NopIN ping reply.. 1776 */ 1777 if (hdr->itt != RESERVED_ITT) { 1778 if (!cmd) 1779 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1780 (unsigned char *)hdr); 1781 1782 spin_lock_bh(&conn->cmd_lock); 1783 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1784 spin_unlock_bh(&conn->cmd_lock); 1785 1786 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1787 1788 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1789 iscsit_add_cmd_to_response_queue(cmd, conn, 1790 cmd->i_state); 1791 return 0; 1792 } 1793 1794 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1795 (unsigned char *)hdr, hdr->cmdsn); 1796 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1797 return 0; 1798 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1799 return -1; 1800 1801 return 0; 1802 } 1803 /* 1804 * This was a response to a unsolicited NOPIN ping. 1805 */ 1806 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1807 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1808 if (!cmd_p) 1809 return -EINVAL; 1810 1811 iscsit_stop_nopin_response_timer(conn); 1812 1813 cmd_p->i_state = ISTATE_REMOVE; 1814 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1815 1816 iscsit_start_nopin_timer(conn); 1817 return 0; 1818 } 1819 /* 1820 * Otherwise, initiator is not expecting a NOPIN is response. 1821 * Just ignore for now. 1822 */ 1823 1824 if (cmd) 1825 iscsit_free_cmd(cmd, false); 1826 1827 return 0; 1828 } 1829 EXPORT_SYMBOL(iscsit_process_nop_out); 1830 1831 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1832 unsigned char *buf) 1833 { 1834 unsigned char *ping_data = NULL; 1835 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1836 struct kvec *iov = NULL; 1837 u32 payload_length = ntoh24(hdr->dlength); 1838 int ret; 1839 1840 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1841 if (ret < 0) 1842 return 0; 1843 /* 1844 * Handle NOP-OUT payload for traditional iSCSI sockets 1845 */ 1846 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1847 u32 checksum, data_crc, padding = 0; 1848 int niov = 0, rx_got, rx_size = payload_length; 1849 1850 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1851 if (!ping_data) { 1852 ret = -1; 1853 goto out; 1854 } 1855 1856 iov = &cmd->iov_misc[0]; 1857 iov[niov].iov_base = ping_data; 1858 iov[niov++].iov_len = payload_length; 1859 1860 padding = ((-payload_length) & 3); 1861 if (padding != 0) { 1862 pr_debug("Receiving %u additional bytes" 1863 " for padding.\n", padding); 1864 iov[niov].iov_base = &cmd->pad_bytes; 1865 iov[niov++].iov_len = padding; 1866 rx_size += padding; 1867 } 1868 if (conn->conn_ops->DataDigest) { 1869 iov[niov].iov_base = &checksum; 1870 iov[niov++].iov_len = ISCSI_CRC_LEN; 1871 rx_size += ISCSI_CRC_LEN; 1872 } 1873 1874 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); 1875 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1876 if (rx_got != rx_size) { 1877 ret = -1; 1878 goto out; 1879 } 1880 1881 if (conn->conn_ops->DataDigest) { 1882 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1883 payload_length, padding, 1884 cmd->pad_bytes, &data_crc); 1885 1886 if (checksum != data_crc) { 1887 pr_err("Ping data CRC32C DataDigest" 1888 " 0x%08x does not match computed 0x%08x\n", 1889 checksum, data_crc); 1890 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1891 pr_err("Unable to recover from" 1892 " NOPOUT Ping DataCRC failure while in" 1893 " ERL=0.\n"); 1894 ret = -1; 1895 goto out; 1896 } else { 1897 /* 1898 * Silently drop this PDU and let the 1899 * initiator plug the CmdSN gap. 1900 */ 1901 pr_debug("Dropping NOPOUT" 1902 " Command CmdSN: 0x%08x due to" 1903 " DataCRC error.\n", hdr->cmdsn); 1904 ret = 0; 1905 goto out; 1906 } 1907 } else { 1908 pr_debug("Got CRC32C DataDigest" 1909 " 0x%08x for %u bytes of ping data.\n", 1910 checksum, payload_length); 1911 } 1912 } 1913 1914 ping_data[payload_length] = '\0'; 1915 /* 1916 * Attach ping data to struct iscsi_cmd->buf_ptr. 1917 */ 1918 cmd->buf_ptr = ping_data; 1919 cmd->buf_ptr_size = payload_length; 1920 1921 pr_debug("Got %u bytes of NOPOUT ping" 1922 " data.\n", payload_length); 1923 pr_debug("Ping Data: \"%s\"\n", ping_data); 1924 } 1925 1926 return iscsit_process_nop_out(conn, cmd, hdr); 1927 out: 1928 if (cmd) 1929 iscsit_free_cmd(cmd, false); 1930 1931 kfree(ping_data); 1932 return ret; 1933 } 1934 1935 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1936 { 1937 switch (iscsi_tmf) { 1938 case ISCSI_TM_FUNC_ABORT_TASK: 1939 return TMR_ABORT_TASK; 1940 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1941 return TMR_ABORT_TASK_SET; 1942 case ISCSI_TM_FUNC_CLEAR_ACA: 1943 return TMR_CLEAR_ACA; 1944 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1945 return TMR_CLEAR_TASK_SET; 1946 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1947 return TMR_LUN_RESET; 1948 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1949 return TMR_TARGET_WARM_RESET; 1950 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1951 return TMR_TARGET_COLD_RESET; 1952 default: 1953 return TMR_UNKNOWN; 1954 } 1955 } 1956 1957 int 1958 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1959 unsigned char *buf) 1960 { 1961 struct se_tmr_req *se_tmr; 1962 struct iscsi_tmr_req *tmr_req; 1963 struct iscsi_tm *hdr; 1964 int out_of_order_cmdsn = 0, ret; 1965 u8 function, tcm_function = TMR_UNKNOWN; 1966 1967 hdr = (struct iscsi_tm *) buf; 1968 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1969 function = hdr->flags; 1970 1971 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1972 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1973 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1974 hdr->rtt, hdr->refcmdsn, conn->cid); 1975 1976 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1977 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1978 hdr->rtt != RESERVED_ITT)) { 1979 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1980 hdr->rtt = RESERVED_ITT; 1981 } 1982 1983 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1984 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1985 pr_err("Task Management Request TASK_REASSIGN not" 1986 " issued as immediate command, bad iSCSI Initiator" 1987 "implementation\n"); 1988 return iscsit_add_reject_cmd(cmd, 1989 ISCSI_REASON_PROTOCOL_ERROR, buf); 1990 } 1991 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1992 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1993 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1994 1995 cmd->data_direction = DMA_NONE; 1996 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1997 if (!cmd->tmr_req) { 1998 return iscsit_add_reject_cmd(cmd, 1999 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2000 buf); 2001 } 2002 2003 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 2004 conn->sess->se_sess, 0, DMA_NONE, 2005 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2006 2007 if (target_get_sess_cmd(&cmd->se_cmd, true) < 0) 2008 return iscsit_add_reject_cmd(cmd, 2009 ISCSI_REASON_WAITING_FOR_LOGOUT, buf); 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 scsilun_to_int(&hdr->lun)); 2047 if (ret < 0) { 2048 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2049 goto attach; 2050 } 2051 } 2052 2053 switch (function) { 2054 case ISCSI_TM_FUNC_ABORT_TASK: 2055 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2056 if (se_tmr->response) 2057 goto attach; 2058 break; 2059 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2060 case ISCSI_TM_FUNC_CLEAR_ACA: 2061 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2062 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2063 break; 2064 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2065 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2066 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2067 goto attach; 2068 } 2069 break; 2070 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2071 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2073 goto attach; 2074 } 2075 break; 2076 case ISCSI_TM_FUNC_TASK_REASSIGN: 2077 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2078 /* 2079 * Perform sanity checks on the ExpDataSN only if the 2080 * TASK_REASSIGN was successful. 2081 */ 2082 if (se_tmr->response) 2083 break; 2084 2085 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2086 return iscsit_add_reject_cmd(cmd, 2087 ISCSI_REASON_BOOKMARK_INVALID, buf); 2088 break; 2089 default: 2090 pr_err("Unknown TMR function: 0x%02x, protocol" 2091 " error.\n", function); 2092 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2093 goto attach; 2094 } 2095 2096 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2097 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2098 se_tmr->call_transport = 1; 2099 attach: 2100 spin_lock_bh(&conn->cmd_lock); 2101 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2102 spin_unlock_bh(&conn->cmd_lock); 2103 2104 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2105 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2106 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2107 out_of_order_cmdsn = 1; 2108 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2109 target_put_sess_cmd(&cmd->se_cmd); 2110 return 0; 2111 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2112 return -1; 2113 } 2114 } 2115 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2116 2117 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2118 return 0; 2119 /* 2120 * Found the referenced task, send to transport for processing. 2121 */ 2122 if (se_tmr->call_transport) 2123 return transport_generic_handle_tmr(&cmd->se_cmd); 2124 2125 /* 2126 * Could not find the referenced LUN, task, or Task Management 2127 * command not authorized or supported. Change state and 2128 * let the tx_thread send the response. 2129 * 2130 * For connection recovery, this is also the default action for 2131 * TMR TASK_REASSIGN. 2132 */ 2133 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2134 target_put_sess_cmd(&cmd->se_cmd); 2135 return 0; 2136 } 2137 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2138 2139 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2140 int 2141 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2142 struct iscsi_text *hdr) 2143 { 2144 u32 payload_length = ntoh24(hdr->dlength); 2145 2146 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2147 pr_err("Unable to accept text parameter length: %u" 2148 "greater than MaxXmitDataSegmentLength %u.\n", 2149 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2151 (unsigned char *)hdr); 2152 } 2153 2154 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2155 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2156 pr_err("Multi sequence text commands currently not supported\n"); 2157 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2158 (unsigned char *)hdr); 2159 } 2160 2161 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2162 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2163 hdr->exp_statsn, payload_length); 2164 2165 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2166 cmd->i_state = ISTATE_SEND_TEXTRSP; 2167 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2169 cmd->targ_xfer_tag = 0xFFFFFFFF; 2170 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2171 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2172 cmd->data_direction = DMA_NONE; 2173 kfree(cmd->text_in_ptr); 2174 cmd->text_in_ptr = NULL; 2175 2176 return 0; 2177 } 2178 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2179 2180 int 2181 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2182 struct iscsi_text *hdr) 2183 { 2184 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2185 int cmdsn_ret; 2186 2187 if (!text_in) { 2188 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2189 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2190 pr_err("Unable to locate text_in buffer for sendtargets" 2191 " discovery\n"); 2192 goto reject; 2193 } 2194 goto empty_sendtargets; 2195 } 2196 if (strncmp("SendTargets=", text_in, 12) != 0) { 2197 pr_err("Received Text Data that is not" 2198 " SendTargets, cannot continue.\n"); 2199 goto reject; 2200 } 2201 /* '=' confirmed in strncmp */ 2202 text_ptr = strchr(text_in, '='); 2203 BUG_ON(!text_ptr); 2204 if (!strncmp("=All", text_ptr, 5)) { 2205 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2206 } else if (!strncmp("=iqn.", text_ptr, 5) || 2207 !strncmp("=eui.", text_ptr, 5)) { 2208 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2209 } else { 2210 pr_err("Unable to locate valid SendTargets%s value\n", 2211 text_ptr); 2212 goto reject; 2213 } 2214 2215 spin_lock_bh(&conn->cmd_lock); 2216 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2217 spin_unlock_bh(&conn->cmd_lock); 2218 2219 empty_sendtargets: 2220 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2221 2222 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2224 (unsigned char *)hdr, hdr->cmdsn); 2225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2226 return -1; 2227 2228 return 0; 2229 } 2230 2231 return iscsit_execute_cmd(cmd, 0); 2232 2233 reject: 2234 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2235 (unsigned char *)hdr); 2236 } 2237 EXPORT_SYMBOL(iscsit_process_text_cmd); 2238 2239 static int 2240 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2241 unsigned char *buf) 2242 { 2243 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2244 char *text_in = NULL; 2245 u32 payload_length = ntoh24(hdr->dlength); 2246 int rx_size, rc; 2247 2248 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2249 if (rc < 0) 2250 return 0; 2251 2252 rx_size = payload_length; 2253 if (payload_length) { 2254 u32 checksum = 0, data_crc = 0; 2255 u32 padding = 0; 2256 int niov = 0, rx_got; 2257 struct kvec iov[2]; 2258 2259 rx_size = ALIGN(payload_length, 4); 2260 text_in = kzalloc(rx_size, GFP_KERNEL); 2261 if (!text_in) 2262 goto reject; 2263 2264 cmd->text_in_ptr = text_in; 2265 2266 memset(iov, 0, sizeof(iov)); 2267 iov[niov].iov_base = text_in; 2268 iov[niov++].iov_len = rx_size; 2269 2270 padding = rx_size - payload_length; 2271 if (padding) 2272 pr_debug("Receiving %u additional bytes" 2273 " for padding.\n", padding); 2274 if (conn->conn_ops->DataDigest) { 2275 iov[niov].iov_base = &checksum; 2276 iov[niov++].iov_len = ISCSI_CRC_LEN; 2277 rx_size += ISCSI_CRC_LEN; 2278 } 2279 2280 WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); 2281 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2282 if (rx_got != rx_size) 2283 goto reject; 2284 2285 if (conn->conn_ops->DataDigest) { 2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2287 text_in, rx_size, 0, NULL, 2288 &data_crc); 2289 2290 if (checksum != data_crc) { 2291 pr_err("Text data CRC32C DataDigest" 2292 " 0x%08x does not match computed" 2293 " 0x%08x\n", checksum, data_crc); 2294 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2295 pr_err("Unable to recover from" 2296 " Text Data digest failure while in" 2297 " ERL=0.\n"); 2298 goto reject; 2299 } else { 2300 /* 2301 * Silently drop this PDU and let the 2302 * initiator plug the CmdSN gap. 2303 */ 2304 pr_debug("Dropping Text" 2305 " Command CmdSN: 0x%08x due to" 2306 " DataCRC error.\n", hdr->cmdsn); 2307 kfree(text_in); 2308 return 0; 2309 } 2310 } else { 2311 pr_debug("Got CRC32C DataDigest" 2312 " 0x%08x for %u bytes of text data.\n", 2313 checksum, payload_length); 2314 } 2315 } 2316 text_in[payload_length - 1] = '\0'; 2317 pr_debug("Successfully read %d bytes of text" 2318 " data.\n", payload_length); 2319 } 2320 2321 return iscsit_process_text_cmd(conn, cmd, hdr); 2322 2323 reject: 2324 kfree(cmd->text_in_ptr); 2325 cmd->text_in_ptr = NULL; 2326 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2327 } 2328 2329 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2330 { 2331 struct iscsi_conn *conn_p; 2332 struct iscsi_session *sess = conn->sess; 2333 2334 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2335 " for SID: %u.\n", conn->cid, conn->sess->sid); 2336 2337 atomic_set(&sess->session_logout, 1); 2338 atomic_set(&conn->conn_logout_remove, 1); 2339 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2340 2341 iscsit_inc_conn_usage_count(conn); 2342 iscsit_inc_session_usage_count(sess); 2343 2344 spin_lock_bh(&sess->conn_lock); 2345 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2346 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2347 continue; 2348 2349 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2350 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2351 } 2352 spin_unlock_bh(&sess->conn_lock); 2353 2354 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2355 2356 return 0; 2357 } 2358 2359 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2360 { 2361 struct iscsi_conn *l_conn; 2362 struct iscsi_session *sess = conn->sess; 2363 2364 pr_debug("Received logout request CLOSECONNECTION for CID:" 2365 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2366 2367 /* 2368 * A Logout Request with a CLOSECONNECTION reason code for a CID 2369 * can arrive on a connection with a differing CID. 2370 */ 2371 if (conn->cid == cmd->logout_cid) { 2372 spin_lock_bh(&conn->state_lock); 2373 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2374 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2375 2376 atomic_set(&conn->conn_logout_remove, 1); 2377 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2378 iscsit_inc_conn_usage_count(conn); 2379 2380 spin_unlock_bh(&conn->state_lock); 2381 } else { 2382 /* 2383 * Handle all different cid CLOSECONNECTION requests in 2384 * iscsit_logout_post_handler_diffcid() as to give enough 2385 * time for any non immediate command's CmdSN to be 2386 * acknowledged on the connection in question. 2387 * 2388 * Here we simply make sure the CID is still around. 2389 */ 2390 l_conn = iscsit_get_conn_from_cid(sess, 2391 cmd->logout_cid); 2392 if (!l_conn) { 2393 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2394 iscsit_add_cmd_to_response_queue(cmd, conn, 2395 cmd->i_state); 2396 return 0; 2397 } 2398 2399 iscsit_dec_conn_usage_count(l_conn); 2400 } 2401 2402 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2403 2404 return 0; 2405 } 2406 2407 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2408 { 2409 struct iscsi_session *sess = conn->sess; 2410 2411 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2412 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2413 2414 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2415 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2416 " while ERL!=2.\n"); 2417 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2418 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2419 return 0; 2420 } 2421 2422 if (conn->cid == cmd->logout_cid) { 2423 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2424 " with CID: %hu on CID: %hu, implementation error.\n", 2425 cmd->logout_cid, conn->cid); 2426 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2428 return 0; 2429 } 2430 2431 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2432 2433 return 0; 2434 } 2435 2436 int 2437 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2438 unsigned char *buf) 2439 { 2440 int cmdsn_ret, logout_remove = 0; 2441 u8 reason_code = 0; 2442 struct iscsi_logout *hdr; 2443 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2444 2445 hdr = (struct iscsi_logout *) buf; 2446 reason_code = (hdr->flags & 0x7f); 2447 2448 if (tiqn) { 2449 spin_lock(&tiqn->logout_stats.lock); 2450 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2451 tiqn->logout_stats.normal_logouts++; 2452 else 2453 tiqn->logout_stats.abnormal_logouts++; 2454 spin_unlock(&tiqn->logout_stats.lock); 2455 } 2456 2457 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2458 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2459 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2460 hdr->cid, conn->cid); 2461 2462 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2463 pr_err("Received logout request on connection that" 2464 " is not in logged in state, ignoring request.\n"); 2465 iscsit_free_cmd(cmd, false); 2466 return 0; 2467 } 2468 2469 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2470 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2471 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2472 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2473 cmd->targ_xfer_tag = 0xFFFFFFFF; 2474 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2475 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2476 cmd->logout_cid = be16_to_cpu(hdr->cid); 2477 cmd->logout_reason = reason_code; 2478 cmd->data_direction = DMA_NONE; 2479 2480 /* 2481 * We need to sleep in these cases (by returning 1) until the Logout 2482 * Response gets sent in the tx thread. 2483 */ 2484 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2485 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2486 be16_to_cpu(hdr->cid) == conn->cid)) 2487 logout_remove = 1; 2488 2489 spin_lock_bh(&conn->cmd_lock); 2490 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2491 spin_unlock_bh(&conn->cmd_lock); 2492 2493 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2494 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2495 2496 /* 2497 * Immediate commands are executed, well, immediately. 2498 * Non-Immediate Logout Commands are executed in CmdSN order. 2499 */ 2500 if (cmd->immediate_cmd) { 2501 int ret = iscsit_execute_cmd(cmd, 0); 2502 2503 if (ret < 0) 2504 return ret; 2505 } else { 2506 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2507 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2508 logout_remove = 0; 2509 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2510 return -1; 2511 } 2512 2513 return logout_remove; 2514 } 2515 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2516 2517 int iscsit_handle_snack( 2518 struct iscsi_conn *conn, 2519 unsigned char *buf) 2520 { 2521 struct iscsi_snack *hdr; 2522 2523 hdr = (struct iscsi_snack *) buf; 2524 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2525 2526 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2527 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2528 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2529 hdr->begrun, hdr->runlength, conn->cid); 2530 2531 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2532 pr_err("Initiator sent SNACK request while in" 2533 " ErrorRecoveryLevel=0.\n"); 2534 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2535 buf); 2536 } 2537 /* 2538 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2539 * call from inside iscsi_send_recovery_datain_or_r2t(). 2540 */ 2541 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2542 case 0: 2543 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2544 hdr->itt, 2545 be32_to_cpu(hdr->ttt), 2546 be32_to_cpu(hdr->begrun), 2547 be32_to_cpu(hdr->runlength)); 2548 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2549 return iscsit_handle_status_snack(conn, hdr->itt, 2550 be32_to_cpu(hdr->ttt), 2551 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2552 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2553 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2554 be32_to_cpu(hdr->begrun), 2555 be32_to_cpu(hdr->runlength)); 2556 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2557 /* FIXME: Support R-Data SNACK */ 2558 pr_err("R-Data SNACK Not Supported.\n"); 2559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2560 buf); 2561 default: 2562 pr_err("Unknown SNACK type 0x%02x, protocol" 2563 " error.\n", hdr->flags & 0x0f); 2564 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2565 buf); 2566 } 2567 2568 return 0; 2569 } 2570 EXPORT_SYMBOL(iscsit_handle_snack); 2571 2572 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2573 { 2574 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2575 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2576 wait_for_completion_interruptible_timeout( 2577 &conn->rx_half_close_comp, 2578 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2579 } 2580 } 2581 2582 static int iscsit_handle_immediate_data( 2583 struct iscsi_cmd *cmd, 2584 struct iscsi_scsi_req *hdr, 2585 u32 length) 2586 { 2587 int iov_ret, rx_got = 0, rx_size = 0; 2588 u32 checksum, iov_count = 0, padding = 0; 2589 struct iscsi_conn *conn = cmd->conn; 2590 struct kvec *iov; 2591 void *overflow_buf = NULL; 2592 2593 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2594 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2595 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2596 cmd->orig_iov_data_count - 2, 2597 cmd->write_data_done, rx_size); 2598 if (iov_ret < 0) 2599 return IMMEDIATE_DATA_CANNOT_RECOVER; 2600 2601 iov_count = iov_ret; 2602 iov = &cmd->iov_data[0]; 2603 if (rx_size < length) { 2604 /* 2605 * Special case: length of immediate data exceeds the data 2606 * buffer size derived from the CDB. 2607 */ 2608 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2609 if (!overflow_buf) { 2610 iscsit_unmap_iovec(cmd); 2611 return IMMEDIATE_DATA_CANNOT_RECOVER; 2612 } 2613 cmd->overflow_buf = overflow_buf; 2614 iov[iov_count].iov_base = overflow_buf; 2615 iov[iov_count].iov_len = length - rx_size; 2616 iov_count++; 2617 rx_size = length; 2618 } 2619 2620 padding = ((-length) & 3); 2621 if (padding != 0) { 2622 iov[iov_count].iov_base = cmd->pad_bytes; 2623 iov[iov_count++].iov_len = padding; 2624 rx_size += padding; 2625 } 2626 2627 if (conn->conn_ops->DataDigest) { 2628 iov[iov_count].iov_base = &checksum; 2629 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2630 rx_size += ISCSI_CRC_LEN; 2631 } 2632 2633 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2634 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2635 2636 iscsit_unmap_iovec(cmd); 2637 2638 if (rx_got != rx_size) { 2639 iscsit_rx_thread_wait_for_tcp(conn); 2640 return IMMEDIATE_DATA_CANNOT_RECOVER; 2641 } 2642 2643 if (conn->conn_ops->DataDigest) { 2644 u32 data_crc; 2645 2646 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2647 cmd->write_data_done, length, padding, 2648 cmd->pad_bytes); 2649 2650 if (checksum != data_crc) { 2651 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2652 " does not match computed 0x%08x\n", checksum, 2653 data_crc); 2654 2655 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2656 pr_err("Unable to recover from" 2657 " Immediate Data digest failure while" 2658 " in ERL=0.\n"); 2659 iscsit_reject_cmd(cmd, 2660 ISCSI_REASON_DATA_DIGEST_ERROR, 2661 (unsigned char *)hdr); 2662 return IMMEDIATE_DATA_CANNOT_RECOVER; 2663 } else { 2664 iscsit_reject_cmd(cmd, 2665 ISCSI_REASON_DATA_DIGEST_ERROR, 2666 (unsigned char *)hdr); 2667 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2668 } 2669 } else { 2670 pr_debug("Got CRC32C DataDigest 0x%08x for" 2671 " %u bytes of Immediate Data\n", checksum, 2672 length); 2673 } 2674 } 2675 2676 cmd->write_data_done += length; 2677 2678 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2679 spin_lock_bh(&cmd->istate_lock); 2680 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2681 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2682 spin_unlock_bh(&cmd->istate_lock); 2683 } 2684 2685 return IMMEDIATE_DATA_NORMAL_OPERATION; 2686 } 2687 2688 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2689 with active network interface */ 2690 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2691 { 2692 struct iscsi_cmd *cmd; 2693 struct iscsi_conn *conn_p; 2694 bool found = false; 2695 2696 lockdep_assert_held(&conn->sess->conn_lock); 2697 2698 /* 2699 * Only send a Asynchronous Message on connections whos network 2700 * interface is still functional. 2701 */ 2702 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2703 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2704 iscsit_inc_conn_usage_count(conn_p); 2705 found = true; 2706 break; 2707 } 2708 } 2709 2710 if (!found) 2711 return; 2712 2713 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2714 if (!cmd) { 2715 iscsit_dec_conn_usage_count(conn_p); 2716 return; 2717 } 2718 2719 cmd->logout_cid = conn->cid; 2720 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2721 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2722 2723 spin_lock_bh(&conn_p->cmd_lock); 2724 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2725 spin_unlock_bh(&conn_p->cmd_lock); 2726 2727 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2728 iscsit_dec_conn_usage_count(conn_p); 2729 } 2730 2731 static int iscsit_send_conn_drop_async_message( 2732 struct iscsi_cmd *cmd, 2733 struct iscsi_conn *conn) 2734 { 2735 struct iscsi_async *hdr; 2736 2737 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2738 2739 hdr = (struct iscsi_async *) cmd->pdu; 2740 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2741 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2742 cmd->init_task_tag = RESERVED_ITT; 2743 cmd->targ_xfer_tag = 0xFFFFFFFF; 2744 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2745 cmd->stat_sn = conn->stat_sn++; 2746 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2747 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2748 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2749 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2750 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2751 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2752 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2753 2754 pr_debug("Sending Connection Dropped Async Message StatSN:" 2755 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2756 cmd->logout_cid, conn->cid); 2757 2758 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2759 } 2760 2761 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2762 { 2763 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2764 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2765 wait_for_completion_interruptible_timeout( 2766 &conn->tx_half_close_comp, 2767 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2768 } 2769 } 2770 2771 void 2772 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2773 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2774 bool set_statsn) 2775 { 2776 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2777 hdr->flags = datain->flags; 2778 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2779 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2780 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2781 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2782 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2783 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2784 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2785 } 2786 } 2787 hton24(hdr->dlength, datain->length); 2788 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2789 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2790 (struct scsi_lun *)&hdr->lun); 2791 else 2792 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2793 2794 hdr->itt = cmd->init_task_tag; 2795 2796 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2797 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2798 else 2799 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2800 if (set_statsn) 2801 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2802 else 2803 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2804 2805 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2806 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2807 hdr->datasn = cpu_to_be32(datain->data_sn); 2808 hdr->offset = cpu_to_be32(datain->offset); 2809 2810 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2811 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2812 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2813 ntohl(hdr->offset), datain->length, conn->cid); 2814 } 2815 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2816 2817 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2818 { 2819 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2820 struct iscsi_datain datain; 2821 struct iscsi_datain_req *dr; 2822 int eodr = 0, ret; 2823 bool set_statsn = false; 2824 2825 memset(&datain, 0, sizeof(struct iscsi_datain)); 2826 dr = iscsit_get_datain_values(cmd, &datain); 2827 if (!dr) { 2828 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2829 cmd->init_task_tag); 2830 return -1; 2831 } 2832 /* 2833 * Be paranoid and double check the logic for now. 2834 */ 2835 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2836 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2837 " datain.length: %u exceeds cmd->data_length: %u\n", 2838 cmd->init_task_tag, datain.offset, datain.length, 2839 cmd->se_cmd.data_length); 2840 return -1; 2841 } 2842 2843 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2844 /* 2845 * Special case for successfully execution w/ both DATAIN 2846 * and Sense Data. 2847 */ 2848 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2849 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2850 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2851 else { 2852 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2853 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2854 iscsit_increment_maxcmdsn(cmd, conn->sess); 2855 cmd->stat_sn = conn->stat_sn++; 2856 set_statsn = true; 2857 } else if (dr->dr_complete == 2858 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2859 set_statsn = true; 2860 } 2861 2862 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2863 2864 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2865 if (ret < 0) 2866 return ret; 2867 2868 if (dr->dr_complete) { 2869 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2870 2 : 1; 2871 iscsit_free_datain_req(cmd, dr); 2872 } 2873 2874 return eodr; 2875 } 2876 2877 int 2878 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2879 struct iscsi_logout_rsp *hdr) 2880 { 2881 struct iscsi_conn *logout_conn = NULL; 2882 struct iscsi_conn_recovery *cr = NULL; 2883 struct iscsi_session *sess = conn->sess; 2884 /* 2885 * The actual shutting down of Sessions and/or Connections 2886 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2887 * is done in scsi_logout_post_handler(). 2888 */ 2889 switch (cmd->logout_reason) { 2890 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2891 pr_debug("iSCSI session logout successful, setting" 2892 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2894 break; 2895 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2896 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2897 break; 2898 /* 2899 * For CLOSECONNECTION logout requests carrying 2900 * a matching logout CID -> local CID, the reference 2901 * for the local CID will have been incremented in 2902 * iscsi_logout_closeconnection(). 2903 * 2904 * For CLOSECONNECTION logout requests carrying 2905 * a different CID than the connection it arrived 2906 * on, the connection responding to cmd->logout_cid 2907 * is stopped in iscsit_logout_post_handler_diffcid(). 2908 */ 2909 2910 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2911 " successful.\n", cmd->logout_cid, conn->cid); 2912 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2913 break; 2914 case ISCSI_LOGOUT_REASON_RECOVERY: 2915 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2916 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2917 break; 2918 /* 2919 * If the connection is still active from our point of view 2920 * force connection recovery to occur. 2921 */ 2922 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2923 cmd->logout_cid); 2924 if (logout_conn) { 2925 iscsit_connection_reinstatement_rcfr(logout_conn); 2926 iscsit_dec_conn_usage_count(logout_conn); 2927 } 2928 2929 cr = iscsit_get_inactive_connection_recovery_entry( 2930 conn->sess, cmd->logout_cid); 2931 if (!cr) { 2932 pr_err("Unable to locate CID: %hu for" 2933 " REMOVECONNFORRECOVERY Logout Request.\n", 2934 cmd->logout_cid); 2935 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2936 break; 2937 } 2938 2939 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2940 2941 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2942 " for recovery for CID: %hu on CID: %hu successful.\n", 2943 cmd->logout_cid, conn->cid); 2944 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2945 break; 2946 default: 2947 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2948 cmd->logout_reason); 2949 return -1; 2950 } 2951 2952 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2953 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2954 hdr->response = cmd->logout_response; 2955 hdr->itt = cmd->init_task_tag; 2956 cmd->stat_sn = conn->stat_sn++; 2957 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2958 2959 iscsit_increment_maxcmdsn(cmd, conn->sess); 2960 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2961 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2962 2963 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2964 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2965 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2966 cmd->logout_cid, conn->cid); 2967 2968 return 0; 2969 } 2970 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2971 2972 static int 2973 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2974 { 2975 int rc; 2976 2977 rc = iscsit_build_logout_rsp(cmd, conn, 2978 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2979 if (rc < 0) 2980 return rc; 2981 2982 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2983 } 2984 2985 void 2986 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2987 struct iscsi_nopin *hdr, bool nopout_response) 2988 { 2989 hdr->opcode = ISCSI_OP_NOOP_IN; 2990 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2991 hton24(hdr->dlength, cmd->buf_ptr_size); 2992 if (nopout_response) 2993 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2994 hdr->itt = cmd->init_task_tag; 2995 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2996 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2997 conn->stat_sn; 2998 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2999 3000 if (nopout_response) 3001 iscsit_increment_maxcmdsn(cmd, conn->sess); 3002 3003 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3004 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3005 3006 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3007 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3008 "Solicited" : "Unsolicited", cmd->init_task_tag, 3009 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3010 } 3011 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3012 3013 /* 3014 * Unsolicited NOPIN, either requesting a response or not. 3015 */ 3016 static int iscsit_send_unsolicited_nopin( 3017 struct iscsi_cmd *cmd, 3018 struct iscsi_conn *conn, 3019 int want_response) 3020 { 3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3022 int ret; 3023 3024 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3025 3026 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3027 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3028 3029 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3030 if (ret < 0) 3031 return ret; 3032 3033 spin_lock_bh(&cmd->istate_lock); 3034 cmd->i_state = want_response ? 3035 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3036 spin_unlock_bh(&cmd->istate_lock); 3037 3038 return 0; 3039 } 3040 3041 static int 3042 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3043 { 3044 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3045 3046 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3047 3048 /* 3049 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3050 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3051 */ 3052 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3053 3054 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3055 cmd->buf_ptr, 3056 cmd->buf_ptr_size); 3057 } 3058 3059 static int iscsit_send_r2t( 3060 struct iscsi_cmd *cmd, 3061 struct iscsi_conn *conn) 3062 { 3063 struct iscsi_r2t *r2t; 3064 struct iscsi_r2t_rsp *hdr; 3065 int ret; 3066 3067 r2t = iscsit_get_r2t_from_list(cmd); 3068 if (!r2t) 3069 return -1; 3070 3071 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3072 memset(hdr, 0, ISCSI_HDR_LEN); 3073 hdr->opcode = ISCSI_OP_R2T; 3074 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3075 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3076 (struct scsi_lun *)&hdr->lun); 3077 hdr->itt = cmd->init_task_tag; 3078 if (conn->conn_transport->iscsit_get_r2t_ttt) 3079 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3080 else 3081 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3082 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3083 hdr->statsn = cpu_to_be32(conn->stat_sn); 3084 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3085 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3086 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3087 hdr->data_offset = cpu_to_be32(r2t->offset); 3088 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3089 3090 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3091 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3092 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3093 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3094 r2t->offset, r2t->xfer_len, conn->cid); 3095 3096 spin_lock_bh(&cmd->r2t_lock); 3097 r2t->sent_r2t = 1; 3098 spin_unlock_bh(&cmd->r2t_lock); 3099 3100 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3101 if (ret < 0) { 3102 return ret; 3103 } 3104 3105 spin_lock_bh(&cmd->dataout_timeout_lock); 3106 iscsit_start_dataout_timer(cmd, conn); 3107 spin_unlock_bh(&cmd->dataout_timeout_lock); 3108 3109 return 0; 3110 } 3111 3112 /* 3113 * @recovery: If called from iscsi_task_reassign_complete_write() for 3114 * connection recovery. 3115 */ 3116 int iscsit_build_r2ts_for_cmd( 3117 struct iscsi_conn *conn, 3118 struct iscsi_cmd *cmd, 3119 bool recovery) 3120 { 3121 int first_r2t = 1; 3122 u32 offset = 0, xfer_len = 0; 3123 3124 spin_lock_bh(&cmd->r2t_lock); 3125 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3126 spin_unlock_bh(&cmd->r2t_lock); 3127 return 0; 3128 } 3129 3130 if (conn->sess->sess_ops->DataSequenceInOrder && 3131 !recovery) 3132 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3133 3134 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3135 if (conn->sess->sess_ops->DataSequenceInOrder) { 3136 offset = cmd->r2t_offset; 3137 3138 if (first_r2t && recovery) { 3139 int new_data_end = offset + 3140 conn->sess->sess_ops->MaxBurstLength - 3141 cmd->next_burst_len; 3142 3143 if (new_data_end > cmd->se_cmd.data_length) 3144 xfer_len = cmd->se_cmd.data_length - offset; 3145 else 3146 xfer_len = 3147 conn->sess->sess_ops->MaxBurstLength - 3148 cmd->next_burst_len; 3149 } else { 3150 int new_data_end = offset + 3151 conn->sess->sess_ops->MaxBurstLength; 3152 3153 if (new_data_end > cmd->se_cmd.data_length) 3154 xfer_len = cmd->se_cmd.data_length - offset; 3155 else 3156 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3157 } 3158 3159 if ((s32)xfer_len < 0) { 3160 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3161 break; 3162 } 3163 3164 cmd->r2t_offset += xfer_len; 3165 3166 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3168 } else { 3169 struct iscsi_seq *seq; 3170 3171 seq = iscsit_get_seq_holder_for_r2t(cmd); 3172 if (!seq) { 3173 spin_unlock_bh(&cmd->r2t_lock); 3174 return -1; 3175 } 3176 3177 offset = seq->offset; 3178 xfer_len = seq->xfer_len; 3179 3180 if (cmd->seq_send_order == cmd->seq_count) 3181 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3182 } 3183 cmd->outstanding_r2ts++; 3184 first_r2t = 0; 3185 3186 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3187 spin_unlock_bh(&cmd->r2t_lock); 3188 return -1; 3189 } 3190 3191 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3192 break; 3193 } 3194 spin_unlock_bh(&cmd->r2t_lock); 3195 3196 return 0; 3197 } 3198 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3199 3200 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3201 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3202 { 3203 if (inc_stat_sn) 3204 cmd->stat_sn = conn->stat_sn++; 3205 3206 atomic_long_inc(&conn->sess->rsp_pdus); 3207 3208 memset(hdr, 0, ISCSI_HDR_LEN); 3209 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3210 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3211 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3212 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3213 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3214 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3215 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3216 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3217 } 3218 hdr->response = cmd->iscsi_response; 3219 hdr->cmd_status = cmd->se_cmd.scsi_status; 3220 hdr->itt = cmd->init_task_tag; 3221 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3222 3223 iscsit_increment_maxcmdsn(cmd, conn->sess); 3224 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3225 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3226 3227 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3228 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3229 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3230 cmd->se_cmd.scsi_status, conn->cid); 3231 } 3232 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3233 3234 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3235 { 3236 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3237 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3238 void *data_buf = NULL; 3239 u32 padding = 0, data_buf_len = 0; 3240 3241 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3242 3243 /* 3244 * Attach SENSE DATA payload to iSCSI Response PDU 3245 */ 3246 if (cmd->se_cmd.sense_buffer && 3247 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3248 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3249 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3250 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3251 3252 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3253 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3254 data_buf = cmd->sense_buffer; 3255 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3256 3257 if (padding) { 3258 memset(cmd->sense_buffer + 3259 cmd->se_cmd.scsi_sense_length, 0, padding); 3260 pr_debug("Adding %u bytes of padding to" 3261 " SENSE.\n", padding); 3262 } 3263 3264 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3265 " Response PDU\n", 3266 cmd->se_cmd.scsi_sense_length); 3267 } 3268 3269 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3270 data_buf_len); 3271 } 3272 3273 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3274 { 3275 switch (se_tmr->response) { 3276 case TMR_FUNCTION_COMPLETE: 3277 return ISCSI_TMF_RSP_COMPLETE; 3278 case TMR_TASK_DOES_NOT_EXIST: 3279 return ISCSI_TMF_RSP_NO_TASK; 3280 case TMR_LUN_DOES_NOT_EXIST: 3281 return ISCSI_TMF_RSP_NO_LUN; 3282 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3283 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3284 case TMR_FUNCTION_REJECTED: 3285 default: 3286 return ISCSI_TMF_RSP_REJECTED; 3287 } 3288 } 3289 3290 void 3291 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3292 struct iscsi_tm_rsp *hdr) 3293 { 3294 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3295 3296 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3297 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3298 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3299 hdr->itt = cmd->init_task_tag; 3300 cmd->stat_sn = conn->stat_sn++; 3301 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3302 3303 iscsit_increment_maxcmdsn(cmd, conn->sess); 3304 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3305 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3306 3307 pr_debug("Built Task Management Response ITT: 0x%08x," 3308 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3309 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3310 } 3311 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3312 3313 static int 3314 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3315 { 3316 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3317 3318 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3319 3320 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3321 } 3322 3323 #define SENDTARGETS_BUF_LIMIT 32768U 3324 3325 static int 3326 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3327 enum iscsit_transport_type network_transport, 3328 int skip_bytes, bool *completed) 3329 { 3330 char *payload = NULL; 3331 struct iscsi_conn *conn = cmd->conn; 3332 struct iscsi_portal_group *tpg; 3333 struct iscsi_tiqn *tiqn; 3334 struct iscsi_tpg_np *tpg_np; 3335 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3336 int target_name_printed; 3337 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3338 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3339 bool active; 3340 3341 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3342 SENDTARGETS_BUF_LIMIT); 3343 3344 payload = kzalloc(buffer_len, GFP_KERNEL); 3345 if (!payload) 3346 return -ENOMEM; 3347 3348 /* 3349 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3350 * explicit case.. 3351 */ 3352 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3353 text_ptr = strchr(text_in, '='); 3354 if (!text_ptr) { 3355 pr_err("Unable to locate '=' string in text_in:" 3356 " %s\n", text_in); 3357 kfree(payload); 3358 return -EINVAL; 3359 } 3360 /* 3361 * Skip over '=' character.. 3362 */ 3363 text_ptr += 1; 3364 } 3365 3366 spin_lock(&tiqn_lock); 3367 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3368 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3369 strcmp(tiqn->tiqn, text_ptr)) { 3370 continue; 3371 } 3372 3373 target_name_printed = 0; 3374 3375 spin_lock(&tiqn->tiqn_tpg_lock); 3376 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3377 3378 /* If demo_mode_discovery=0 and generate_node_acls=0 3379 * (demo mode dislabed) do not return 3380 * TargetName+TargetAddress unless a NodeACL exists. 3381 */ 3382 3383 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3384 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3385 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3386 cmd->conn->sess->sess_ops->InitiatorName))) { 3387 continue; 3388 } 3389 3390 spin_lock(&tpg->tpg_state_lock); 3391 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3392 spin_unlock(&tpg->tpg_state_lock); 3393 3394 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3395 continue; 3396 3397 spin_lock(&tpg->tpg_np_lock); 3398 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3399 tpg_np_list) { 3400 struct iscsi_np *np = tpg_np->tpg_np; 3401 struct sockaddr_storage *sockaddr; 3402 3403 if (np->np_network_transport != network_transport) 3404 continue; 3405 3406 if (!target_name_printed) { 3407 len = sprintf(buf, "TargetName=%s", 3408 tiqn->tiqn); 3409 len += 1; 3410 3411 if ((len + payload_len) > buffer_len) { 3412 spin_unlock(&tpg->tpg_np_lock); 3413 spin_unlock(&tiqn->tiqn_tpg_lock); 3414 end_of_buf = 1; 3415 goto eob; 3416 } 3417 3418 if (skip_bytes && len <= skip_bytes) { 3419 skip_bytes -= len; 3420 } else { 3421 memcpy(payload + payload_len, buf, len); 3422 payload_len += len; 3423 target_name_printed = 1; 3424 if (len > skip_bytes) 3425 skip_bytes = 0; 3426 } 3427 } 3428 3429 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3430 sockaddr = &conn->local_sockaddr; 3431 else 3432 sockaddr = &np->np_sockaddr; 3433 3434 len = sprintf(buf, "TargetAddress=" 3435 "%pISpc,%hu", 3436 sockaddr, 3437 tpg->tpgt); 3438 len += 1; 3439 3440 if ((len + payload_len) > buffer_len) { 3441 spin_unlock(&tpg->tpg_np_lock); 3442 spin_unlock(&tiqn->tiqn_tpg_lock); 3443 end_of_buf = 1; 3444 goto eob; 3445 } 3446 3447 if (skip_bytes && len <= skip_bytes) { 3448 skip_bytes -= len; 3449 } else { 3450 memcpy(payload + payload_len, buf, len); 3451 payload_len += len; 3452 if (len > skip_bytes) 3453 skip_bytes = 0; 3454 } 3455 } 3456 spin_unlock(&tpg->tpg_np_lock); 3457 } 3458 spin_unlock(&tiqn->tiqn_tpg_lock); 3459 eob: 3460 if (end_of_buf) { 3461 *completed = false; 3462 break; 3463 } 3464 3465 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3466 break; 3467 } 3468 spin_unlock(&tiqn_lock); 3469 3470 cmd->buf_ptr = payload; 3471 3472 return payload_len; 3473 } 3474 3475 int 3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3477 struct iscsi_text_rsp *hdr, 3478 enum iscsit_transport_type network_transport) 3479 { 3480 int text_length, padding; 3481 bool completed = true; 3482 3483 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3484 cmd->read_data_done, 3485 &completed); 3486 if (text_length < 0) 3487 return text_length; 3488 3489 if (completed) { 3490 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3491 } else { 3492 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3493 cmd->read_data_done += text_length; 3494 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3495 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3496 } 3497 hdr->opcode = ISCSI_OP_TEXT_RSP; 3498 padding = ((-text_length) & 3); 3499 hton24(hdr->dlength, text_length); 3500 hdr->itt = cmd->init_task_tag; 3501 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3502 cmd->stat_sn = conn->stat_sn++; 3503 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3504 3505 iscsit_increment_maxcmdsn(cmd, conn->sess); 3506 /* 3507 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3508 * correctly increment MaxCmdSN for each response answering a 3509 * non immediate text request with a valid CmdSN. 3510 */ 3511 cmd->maxcmdsn_inc = 0; 3512 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3513 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3514 3515 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3516 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3517 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3518 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3519 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3520 3521 return text_length + padding; 3522 } 3523 EXPORT_SYMBOL(iscsit_build_text_rsp); 3524 3525 static int iscsit_send_text_rsp( 3526 struct iscsi_cmd *cmd, 3527 struct iscsi_conn *conn) 3528 { 3529 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3530 int text_length; 3531 3532 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3533 conn->conn_transport->transport_type); 3534 if (text_length < 0) 3535 return text_length; 3536 3537 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3538 cmd->buf_ptr, 3539 text_length); 3540 } 3541 3542 void 3543 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3544 struct iscsi_reject *hdr) 3545 { 3546 hdr->opcode = ISCSI_OP_REJECT; 3547 hdr->reason = cmd->reject_reason; 3548 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3549 hton24(hdr->dlength, ISCSI_HDR_LEN); 3550 hdr->ffffffff = cpu_to_be32(0xffffffff); 3551 cmd->stat_sn = conn->stat_sn++; 3552 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3553 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3554 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3555 3556 } 3557 EXPORT_SYMBOL(iscsit_build_reject); 3558 3559 static int iscsit_send_reject( 3560 struct iscsi_cmd *cmd, 3561 struct iscsi_conn *conn) 3562 { 3563 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3564 3565 iscsit_build_reject(cmd, conn, hdr); 3566 3567 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3568 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3569 3570 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3571 cmd->buf_ptr, 3572 ISCSI_HDR_LEN); 3573 } 3574 3575 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3576 { 3577 int ord, cpu; 3578 /* 3579 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3580 * within iscsit_start_kthreads() 3581 * 3582 * Here we use bitmap_id to determine which CPU that this 3583 * iSCSI connection's RX/TX threads will be scheduled to 3584 * execute upon. 3585 */ 3586 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3587 for_each_online_cpu(cpu) { 3588 if (ord-- == 0) { 3589 cpumask_set_cpu(cpu, conn->conn_cpumask); 3590 return; 3591 } 3592 } 3593 /* 3594 * This should never be reached.. 3595 */ 3596 dump_stack(); 3597 cpumask_setall(conn->conn_cpumask); 3598 } 3599 3600 int 3601 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3602 { 3603 int ret; 3604 3605 switch (state) { 3606 case ISTATE_SEND_R2T: 3607 ret = iscsit_send_r2t(cmd, conn); 3608 if (ret < 0) 3609 goto err; 3610 break; 3611 case ISTATE_REMOVE: 3612 spin_lock_bh(&conn->cmd_lock); 3613 list_del_init(&cmd->i_conn_node); 3614 spin_unlock_bh(&conn->cmd_lock); 3615 3616 iscsit_free_cmd(cmd, false); 3617 break; 3618 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3619 iscsit_mod_nopin_response_timer(conn); 3620 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3621 if (ret < 0) 3622 goto err; 3623 break; 3624 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3625 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3626 if (ret < 0) 3627 goto err; 3628 break; 3629 default: 3630 pr_err("Unknown Opcode: 0x%02x ITT:" 3631 " 0x%08x, i_state: %d on CID: %hu\n", 3632 cmd->iscsi_opcode, cmd->init_task_tag, state, 3633 conn->cid); 3634 goto err; 3635 } 3636 3637 return 0; 3638 3639 err: 3640 return -1; 3641 } 3642 EXPORT_SYMBOL(iscsit_immediate_queue); 3643 3644 static int 3645 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3646 { 3647 struct iscsit_transport *t = conn->conn_transport; 3648 struct iscsi_queue_req *qr; 3649 struct iscsi_cmd *cmd; 3650 u8 state; 3651 int ret; 3652 3653 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3654 atomic_set(&conn->check_immediate_queue, 0); 3655 cmd = qr->cmd; 3656 state = qr->state; 3657 kmem_cache_free(lio_qr_cache, qr); 3658 3659 ret = t->iscsit_immediate_queue(conn, cmd, state); 3660 if (ret < 0) 3661 return ret; 3662 } 3663 3664 return 0; 3665 } 3666 3667 int 3668 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3669 { 3670 int ret; 3671 3672 check_rsp_state: 3673 switch (state) { 3674 case ISTATE_SEND_DATAIN: 3675 ret = iscsit_send_datain(cmd, conn); 3676 if (ret < 0) 3677 goto err; 3678 else if (!ret) 3679 /* more drs */ 3680 goto check_rsp_state; 3681 else if (ret == 1) { 3682 /* all done */ 3683 spin_lock_bh(&cmd->istate_lock); 3684 cmd->i_state = ISTATE_SENT_STATUS; 3685 spin_unlock_bh(&cmd->istate_lock); 3686 3687 if (atomic_read(&conn->check_immediate_queue)) 3688 return 1; 3689 3690 return 0; 3691 } else if (ret == 2) { 3692 /* Still must send status, 3693 SCF_TRANSPORT_TASK_SENSE was set */ 3694 spin_lock_bh(&cmd->istate_lock); 3695 cmd->i_state = ISTATE_SEND_STATUS; 3696 spin_unlock_bh(&cmd->istate_lock); 3697 state = ISTATE_SEND_STATUS; 3698 goto check_rsp_state; 3699 } 3700 3701 break; 3702 case ISTATE_SEND_STATUS: 3703 case ISTATE_SEND_STATUS_RECOVERY: 3704 ret = iscsit_send_response(cmd, conn); 3705 break; 3706 case ISTATE_SEND_LOGOUTRSP: 3707 ret = iscsit_send_logout(cmd, conn); 3708 break; 3709 case ISTATE_SEND_ASYNCMSG: 3710 ret = iscsit_send_conn_drop_async_message( 3711 cmd, conn); 3712 break; 3713 case ISTATE_SEND_NOPIN: 3714 ret = iscsit_send_nopin(cmd, conn); 3715 break; 3716 case ISTATE_SEND_REJECT: 3717 ret = iscsit_send_reject(cmd, conn); 3718 break; 3719 case ISTATE_SEND_TASKMGTRSP: 3720 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3721 if (ret != 0) 3722 break; 3723 ret = iscsit_tmr_post_handler(cmd, conn); 3724 if (ret != 0) 3725 iscsit_fall_back_to_erl0(conn->sess); 3726 break; 3727 case ISTATE_SEND_TEXTRSP: 3728 ret = iscsit_send_text_rsp(cmd, conn); 3729 break; 3730 default: 3731 pr_err("Unknown Opcode: 0x%02x ITT:" 3732 " 0x%08x, i_state: %d on CID: %hu\n", 3733 cmd->iscsi_opcode, cmd->init_task_tag, 3734 state, conn->cid); 3735 goto err; 3736 } 3737 if (ret < 0) 3738 goto err; 3739 3740 switch (state) { 3741 case ISTATE_SEND_LOGOUTRSP: 3742 if (!iscsit_logout_post_handler(cmd, conn)) 3743 return -ECONNRESET; 3744 /* fall through */ 3745 case ISTATE_SEND_STATUS: 3746 case ISTATE_SEND_ASYNCMSG: 3747 case ISTATE_SEND_NOPIN: 3748 case ISTATE_SEND_STATUS_RECOVERY: 3749 case ISTATE_SEND_TEXTRSP: 3750 case ISTATE_SEND_TASKMGTRSP: 3751 case ISTATE_SEND_REJECT: 3752 spin_lock_bh(&cmd->istate_lock); 3753 cmd->i_state = ISTATE_SENT_STATUS; 3754 spin_unlock_bh(&cmd->istate_lock); 3755 break; 3756 default: 3757 pr_err("Unknown Opcode: 0x%02x ITT:" 3758 " 0x%08x, i_state: %d on CID: %hu\n", 3759 cmd->iscsi_opcode, cmd->init_task_tag, 3760 cmd->i_state, conn->cid); 3761 goto err; 3762 } 3763 3764 if (atomic_read(&conn->check_immediate_queue)) 3765 return 1; 3766 3767 return 0; 3768 3769 err: 3770 return -1; 3771 } 3772 EXPORT_SYMBOL(iscsit_response_queue); 3773 3774 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3775 { 3776 struct iscsit_transport *t = conn->conn_transport; 3777 struct iscsi_queue_req *qr; 3778 struct iscsi_cmd *cmd; 3779 u8 state; 3780 int ret; 3781 3782 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3783 cmd = qr->cmd; 3784 state = qr->state; 3785 kmem_cache_free(lio_qr_cache, qr); 3786 3787 ret = t->iscsit_response_queue(conn, cmd, state); 3788 if (ret == 1 || ret < 0) 3789 return ret; 3790 } 3791 3792 return 0; 3793 } 3794 3795 int iscsi_target_tx_thread(void *arg) 3796 { 3797 int ret = 0; 3798 struct iscsi_conn *conn = arg; 3799 bool conn_freed = false; 3800 3801 /* 3802 * Allow ourselves to be interrupted by SIGINT so that a 3803 * connection recovery / failure event can be triggered externally. 3804 */ 3805 allow_signal(SIGINT); 3806 3807 while (!kthread_should_stop()) { 3808 /* 3809 * Ensure that both TX and RX per connection kthreads 3810 * are scheduled to run on the same CPU. 3811 */ 3812 iscsit_thread_check_cpumask(conn, current, 1); 3813 3814 wait_event_interruptible(conn->queues_wq, 3815 !iscsit_conn_all_queues_empty(conn)); 3816 3817 if (signal_pending(current)) 3818 goto transport_err; 3819 3820 get_immediate: 3821 ret = iscsit_handle_immediate_queue(conn); 3822 if (ret < 0) 3823 goto transport_err; 3824 3825 ret = iscsit_handle_response_queue(conn); 3826 if (ret == 1) { 3827 goto get_immediate; 3828 } else if (ret == -ECONNRESET) { 3829 conn_freed = true; 3830 goto out; 3831 } else if (ret < 0) { 3832 goto transport_err; 3833 } 3834 } 3835 3836 transport_err: 3837 /* 3838 * Avoid the normal connection failure code-path if this connection 3839 * is still within LOGIN mode, and iscsi_np process context is 3840 * responsible for cleaning up the early connection failure. 3841 */ 3842 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3843 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3844 out: 3845 if (!conn_freed) { 3846 while (!kthread_should_stop()) { 3847 msleep(100); 3848 } 3849 } 3850 return 0; 3851 } 3852 3853 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3854 { 3855 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3856 struct iscsi_cmd *cmd; 3857 int ret = 0; 3858 3859 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3860 case ISCSI_OP_SCSI_CMD: 3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3862 if (!cmd) 3863 goto reject; 3864 3865 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3866 break; 3867 case ISCSI_OP_SCSI_DATA_OUT: 3868 ret = iscsit_handle_data_out(conn, buf); 3869 break; 3870 case ISCSI_OP_NOOP_OUT: 3871 cmd = NULL; 3872 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3874 if (!cmd) 3875 goto reject; 3876 } 3877 ret = iscsit_handle_nop_out(conn, cmd, buf); 3878 break; 3879 case ISCSI_OP_SCSI_TMFUNC: 3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3881 if (!cmd) 3882 goto reject; 3883 3884 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3885 break; 3886 case ISCSI_OP_TEXT: 3887 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3888 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3889 if (!cmd) 3890 goto reject; 3891 } else { 3892 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3893 if (!cmd) 3894 goto reject; 3895 } 3896 3897 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3898 break; 3899 case ISCSI_OP_LOGOUT: 3900 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3901 if (!cmd) 3902 goto reject; 3903 3904 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3905 if (ret > 0) 3906 wait_for_completion_timeout(&conn->conn_logout_comp, 3907 SECONDS_FOR_LOGOUT_COMP * HZ); 3908 break; 3909 case ISCSI_OP_SNACK: 3910 ret = iscsit_handle_snack(conn, buf); 3911 break; 3912 default: 3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3914 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3915 pr_err("Cannot recover from unknown" 3916 " opcode while ERL=0, closing iSCSI connection.\n"); 3917 return -1; 3918 } 3919 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3920 " closing iSCSI connection.\n"); 3921 ret = -1; 3922 break; 3923 } 3924 3925 return ret; 3926 reject: 3927 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3928 } 3929 3930 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3931 { 3932 bool ret; 3933 3934 spin_lock_bh(&conn->state_lock); 3935 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3936 spin_unlock_bh(&conn->state_lock); 3937 3938 return ret; 3939 } 3940 3941 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3942 { 3943 int ret; 3944 u8 *buffer, opcode; 3945 u32 checksum = 0, digest = 0; 3946 struct kvec iov; 3947 3948 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 3949 if (!buffer) 3950 return; 3951 3952 while (!kthread_should_stop()) { 3953 /* 3954 * Ensure that both TX and RX per connection kthreads 3955 * are scheduled to run on the same CPU. 3956 */ 3957 iscsit_thread_check_cpumask(conn, current, 0); 3958 3959 memset(&iov, 0, sizeof(struct kvec)); 3960 3961 iov.iov_base = buffer; 3962 iov.iov_len = ISCSI_HDR_LEN; 3963 3964 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3965 if (ret != ISCSI_HDR_LEN) { 3966 iscsit_rx_thread_wait_for_tcp(conn); 3967 break; 3968 } 3969 3970 if (conn->conn_ops->HeaderDigest) { 3971 iov.iov_base = &digest; 3972 iov.iov_len = ISCSI_CRC_LEN; 3973 3974 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3975 if (ret != ISCSI_CRC_LEN) { 3976 iscsit_rx_thread_wait_for_tcp(conn); 3977 break; 3978 } 3979 3980 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3981 ISCSI_HDR_LEN, 0, NULL, 3982 &checksum); 3983 3984 if (digest != checksum) { 3985 pr_err("HeaderDigest CRC32C failed," 3986 " received 0x%08x, computed 0x%08x\n", 3987 digest, checksum); 3988 /* 3989 * Set the PDU to 0xff so it will intentionally 3990 * hit default in the switch below. 3991 */ 3992 memset(buffer, 0xff, ISCSI_HDR_LEN); 3993 atomic_long_inc(&conn->sess->conn_digest_errors); 3994 } else { 3995 pr_debug("Got HeaderDigest CRC32C" 3996 " 0x%08x\n", checksum); 3997 } 3998 } 3999 4000 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4001 break; 4002 4003 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4004 4005 if (conn->sess->sess_ops->SessionType && 4006 ((!(opcode & ISCSI_OP_TEXT)) || 4007 (!(opcode & ISCSI_OP_LOGOUT)))) { 4008 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4009 " while in Discovery Session, rejecting.\n", opcode); 4010 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4011 buffer); 4012 break; 4013 } 4014 4015 ret = iscsi_target_rx_opcode(conn, buffer); 4016 if (ret < 0) 4017 break; 4018 } 4019 4020 kfree(buffer); 4021 } 4022 4023 int iscsi_target_rx_thread(void *arg) 4024 { 4025 int rc; 4026 struct iscsi_conn *conn = arg; 4027 bool conn_freed = false; 4028 4029 /* 4030 * Allow ourselves to be interrupted by SIGINT so that a 4031 * connection recovery / failure event can be triggered externally. 4032 */ 4033 allow_signal(SIGINT); 4034 /* 4035 * Wait for iscsi_post_login_handler() to complete before allowing 4036 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4037 */ 4038 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4039 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4040 goto out; 4041 4042 if (!conn->conn_transport->iscsit_get_rx_pdu) 4043 return 0; 4044 4045 conn->conn_transport->iscsit_get_rx_pdu(conn); 4046 4047 if (!signal_pending(current)) 4048 atomic_set(&conn->transport_failed, 1); 4049 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4050 4051 out: 4052 if (!conn_freed) { 4053 while (!kthread_should_stop()) { 4054 msleep(100); 4055 } 4056 } 4057 4058 return 0; 4059 } 4060 4061 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4062 { 4063 LIST_HEAD(tmp_list); 4064 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4065 struct iscsi_session *sess = conn->sess; 4066 /* 4067 * We expect this function to only ever be called from either RX or TX 4068 * thread context via iscsit_close_connection() once the other context 4069 * has been reset -> returned sleeping pre-handler state. 4070 */ 4071 spin_lock_bh(&conn->cmd_lock); 4072 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4073 4074 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4075 struct se_cmd *se_cmd = &cmd->se_cmd; 4076 4077 if (se_cmd->se_tfo != NULL) { 4078 spin_lock_irq(&se_cmd->t_state_lock); 4079 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4080 spin_unlock_irq(&se_cmd->t_state_lock); 4081 } 4082 } 4083 spin_unlock_bh(&conn->cmd_lock); 4084 4085 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4086 list_del_init(&cmd->i_conn_node); 4087 4088 iscsit_increment_maxcmdsn(cmd, sess); 4089 iscsit_free_cmd(cmd, true); 4090 4091 } 4092 } 4093 4094 static void iscsit_stop_timers_for_cmds( 4095 struct iscsi_conn *conn) 4096 { 4097 struct iscsi_cmd *cmd; 4098 4099 spin_lock_bh(&conn->cmd_lock); 4100 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4101 if (cmd->data_direction == DMA_TO_DEVICE) 4102 iscsit_stop_dataout_timer(cmd); 4103 } 4104 spin_unlock_bh(&conn->cmd_lock); 4105 } 4106 4107 int iscsit_close_connection( 4108 struct iscsi_conn *conn) 4109 { 4110 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4111 struct iscsi_session *sess = conn->sess; 4112 4113 pr_debug("Closing iSCSI connection CID %hu on SID:" 4114 " %u\n", conn->cid, sess->sid); 4115 /* 4116 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4117 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4118 * sleeping and the logout response never got sent because the 4119 * connection failed. 4120 * 4121 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4122 * to signal logout response TX interrupt completion. Go ahead and skip 4123 * this for iser since isert_rx_opcode() does not wait on logout failure, 4124 * and to avoid iscsi_conn pointer dereference in iser-target code. 4125 */ 4126 if (!conn->conn_transport->rdma_shutdown) 4127 complete(&conn->conn_logout_comp); 4128 4129 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4130 if (conn->tx_thread && 4131 cmpxchg(&conn->tx_thread_active, true, false)) { 4132 send_sig(SIGINT, conn->tx_thread, 1); 4133 kthread_stop(conn->tx_thread); 4134 } 4135 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4136 if (conn->rx_thread && 4137 cmpxchg(&conn->rx_thread_active, true, false)) { 4138 send_sig(SIGINT, conn->rx_thread, 1); 4139 kthread_stop(conn->rx_thread); 4140 } 4141 } 4142 4143 spin_lock(&iscsit_global->ts_bitmap_lock); 4144 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4145 get_order(1)); 4146 spin_unlock(&iscsit_global->ts_bitmap_lock); 4147 4148 iscsit_stop_timers_for_cmds(conn); 4149 iscsit_stop_nopin_response_timer(conn); 4150 iscsit_stop_nopin_timer(conn); 4151 4152 if (conn->conn_transport->iscsit_wait_conn) 4153 conn->conn_transport->iscsit_wait_conn(conn); 4154 4155 /* 4156 * During Connection recovery drop unacknowledged out of order 4157 * commands for this connection, and prepare the other commands 4158 * for reallegiance. 4159 * 4160 * During normal operation clear the out of order commands (but 4161 * do not free the struct iscsi_ooo_cmdsn's) and release all 4162 * struct iscsi_cmds. 4163 */ 4164 if (atomic_read(&conn->connection_recovery)) { 4165 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4166 iscsit_prepare_cmds_for_reallegiance(conn); 4167 } else { 4168 iscsit_clear_ooo_cmdsns_for_conn(conn); 4169 iscsit_release_commands_from_conn(conn); 4170 } 4171 iscsit_free_queue_reqs_for_conn(conn); 4172 4173 /* 4174 * Handle decrementing session or connection usage count if 4175 * a logout response was not able to be sent because the 4176 * connection failed. Fall back to Session Recovery here. 4177 */ 4178 if (atomic_read(&conn->conn_logout_remove)) { 4179 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4180 iscsit_dec_conn_usage_count(conn); 4181 iscsit_dec_session_usage_count(sess); 4182 } 4183 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4184 iscsit_dec_conn_usage_count(conn); 4185 4186 atomic_set(&conn->conn_logout_remove, 0); 4187 atomic_set(&sess->session_reinstatement, 0); 4188 atomic_set(&sess->session_fall_back_to_erl0, 1); 4189 } 4190 4191 spin_lock_bh(&sess->conn_lock); 4192 list_del(&conn->conn_list); 4193 4194 /* 4195 * Attempt to let the Initiator know this connection failed by 4196 * sending an Connection Dropped Async Message on another 4197 * active connection. 4198 */ 4199 if (atomic_read(&conn->connection_recovery)) 4200 iscsit_build_conn_drop_async_message(conn); 4201 4202 spin_unlock_bh(&sess->conn_lock); 4203 4204 /* 4205 * If connection reinstatement is being performed on this connection, 4206 * up the connection reinstatement semaphore that is being blocked on 4207 * in iscsit_cause_connection_reinstatement(). 4208 */ 4209 spin_lock_bh(&conn->state_lock); 4210 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4211 spin_unlock_bh(&conn->state_lock); 4212 complete(&conn->conn_wait_comp); 4213 wait_for_completion(&conn->conn_post_wait_comp); 4214 spin_lock_bh(&conn->state_lock); 4215 } 4216 4217 /* 4218 * If connection reinstatement is being performed on this connection 4219 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4220 * connection wait rcfr semaphore that is being blocked on 4221 * an iscsit_connection_reinstatement_rcfr(). 4222 */ 4223 if (atomic_read(&conn->connection_wait_rcfr)) { 4224 spin_unlock_bh(&conn->state_lock); 4225 complete(&conn->conn_wait_rcfr_comp); 4226 wait_for_completion(&conn->conn_post_wait_comp); 4227 spin_lock_bh(&conn->state_lock); 4228 } 4229 atomic_set(&conn->connection_reinstatement, 1); 4230 spin_unlock_bh(&conn->state_lock); 4231 4232 /* 4233 * If any other processes are accessing this connection pointer we 4234 * must wait until they have completed. 4235 */ 4236 iscsit_check_conn_usage_count(conn); 4237 target_sess_cmd_list_set_waiting(sess->se_sess); 4238 target_wait_for_sess_cmds(sess->se_sess); 4239 4240 ahash_request_free(conn->conn_tx_hash); 4241 if (conn->conn_rx_hash) { 4242 struct crypto_ahash *tfm; 4243 4244 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4245 ahash_request_free(conn->conn_rx_hash); 4246 crypto_free_ahash(tfm); 4247 } 4248 4249 if (conn->sock) 4250 sock_release(conn->sock); 4251 4252 if (conn->conn_transport->iscsit_free_conn) 4253 conn->conn_transport->iscsit_free_conn(conn); 4254 4255 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4256 conn->conn_state = TARG_CONN_STATE_FREE; 4257 iscsit_free_conn(conn); 4258 4259 spin_lock_bh(&sess->conn_lock); 4260 atomic_dec(&sess->nconn); 4261 pr_debug("Decremented iSCSI connection count to %hu from node:" 4262 " %s\n", atomic_read(&sess->nconn), 4263 sess->sess_ops->InitiatorName); 4264 /* 4265 * Make sure that if one connection fails in an non ERL=2 iSCSI 4266 * Session that they all fail. 4267 */ 4268 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4269 !atomic_read(&sess->session_logout)) 4270 atomic_set(&sess->session_fall_back_to_erl0, 1); 4271 4272 /* 4273 * If this was not the last connection in the session, and we are 4274 * performing session reinstatement or falling back to ERL=0, call 4275 * iscsit_stop_session() without sleeping to shutdown the other 4276 * active connections. 4277 */ 4278 if (atomic_read(&sess->nconn)) { 4279 if (!atomic_read(&sess->session_reinstatement) && 4280 !atomic_read(&sess->session_fall_back_to_erl0)) { 4281 spin_unlock_bh(&sess->conn_lock); 4282 return 0; 4283 } 4284 if (!atomic_read(&sess->session_stop_active)) { 4285 atomic_set(&sess->session_stop_active, 1); 4286 spin_unlock_bh(&sess->conn_lock); 4287 iscsit_stop_session(sess, 0, 0); 4288 return 0; 4289 } 4290 spin_unlock_bh(&sess->conn_lock); 4291 return 0; 4292 } 4293 4294 /* 4295 * If this was the last connection in the session and one of the 4296 * following is occurring: 4297 * 4298 * Session Reinstatement is not being performed, and are falling back 4299 * to ERL=0 call iscsit_close_session(). 4300 * 4301 * Session Logout was requested. iscsit_close_session() will be called 4302 * elsewhere. 4303 * 4304 * Session Continuation is not being performed, start the Time2Retain 4305 * handler and check if sleep_on_sess_wait_sem is active. 4306 */ 4307 if (!atomic_read(&sess->session_reinstatement) && 4308 atomic_read(&sess->session_fall_back_to_erl0)) { 4309 spin_unlock_bh(&sess->conn_lock); 4310 iscsit_close_session(sess); 4311 4312 return 0; 4313 } else if (atomic_read(&sess->session_logout)) { 4314 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4315 sess->session_state = TARG_SESS_STATE_FREE; 4316 spin_unlock_bh(&sess->conn_lock); 4317 4318 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4319 complete(&sess->session_wait_comp); 4320 4321 return 0; 4322 } else { 4323 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4324 sess->session_state = TARG_SESS_STATE_FAILED; 4325 4326 if (!atomic_read(&sess->session_continuation)) { 4327 spin_unlock_bh(&sess->conn_lock); 4328 iscsit_start_time2retain_handler(sess); 4329 } else 4330 spin_unlock_bh(&sess->conn_lock); 4331 4332 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4333 complete(&sess->session_wait_comp); 4334 4335 return 0; 4336 } 4337 } 4338 4339 /* 4340 * If the iSCSI Session for the iSCSI Initiator Node exists, 4341 * forcefully shutdown the iSCSI NEXUS. 4342 */ 4343 int iscsit_close_session(struct iscsi_session *sess) 4344 { 4345 struct iscsi_portal_group *tpg = sess->tpg; 4346 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4347 4348 if (atomic_read(&sess->nconn)) { 4349 pr_err("%d connection(s) still exist for iSCSI session" 4350 " to %s\n", atomic_read(&sess->nconn), 4351 sess->sess_ops->InitiatorName); 4352 BUG(); 4353 } 4354 4355 spin_lock_bh(&se_tpg->session_lock); 4356 atomic_set(&sess->session_logout, 1); 4357 atomic_set(&sess->session_reinstatement, 1); 4358 iscsit_stop_time2retain_timer(sess); 4359 spin_unlock_bh(&se_tpg->session_lock); 4360 4361 /* 4362 * transport_deregister_session_configfs() will clear the 4363 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4364 * can be setting it again with __transport_register_session() in 4365 * iscsi_post_login_handler() again after the iscsit_stop_session() 4366 * completes in iscsi_np context. 4367 */ 4368 transport_deregister_session_configfs(sess->se_sess); 4369 4370 /* 4371 * If any other processes are accessing this session pointer we must 4372 * wait until they have completed. If we are in an interrupt (the 4373 * time2retain handler) and contain and active session usage count we 4374 * restart the timer and exit. 4375 */ 4376 if (!in_interrupt()) { 4377 if (iscsit_check_session_usage_count(sess) == 1) 4378 iscsit_stop_session(sess, 1, 1); 4379 } else { 4380 if (iscsit_check_session_usage_count(sess) == 2) { 4381 atomic_set(&sess->session_logout, 0); 4382 iscsit_start_time2retain_handler(sess); 4383 return 0; 4384 } 4385 } 4386 4387 transport_deregister_session(sess->se_sess); 4388 4389 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4390 iscsit_free_connection_recovery_entries(sess); 4391 4392 iscsit_free_all_ooo_cmdsns(sess); 4393 4394 spin_lock_bh(&se_tpg->session_lock); 4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4396 sess->session_state = TARG_SESS_STATE_FREE; 4397 pr_debug("Released iSCSI session from node: %s\n", 4398 sess->sess_ops->InitiatorName); 4399 tpg->nsessions--; 4400 if (tpg->tpg_tiqn) 4401 tpg->tpg_tiqn->tiqn_nsessions--; 4402 4403 pr_debug("Decremented number of active iSCSI Sessions on" 4404 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4405 4406 ida_free(&sess_ida, sess->session_index); 4407 kfree(sess->sess_ops); 4408 sess->sess_ops = NULL; 4409 spin_unlock_bh(&se_tpg->session_lock); 4410 4411 kfree(sess); 4412 return 0; 4413 } 4414 4415 static void iscsit_logout_post_handler_closesession( 4416 struct iscsi_conn *conn) 4417 { 4418 struct iscsi_session *sess = conn->sess; 4419 int sleep = 1; 4420 /* 4421 * Traditional iscsi/tcp will invoke this logic from TX thread 4422 * context during session logout, so clear tx_thread_active and 4423 * sleep if iscsit_close_connection() has not already occured. 4424 * 4425 * Since iser-target invokes this logic from it's own workqueue, 4426 * always sleep waiting for RX/TX thread shutdown to complete 4427 * within iscsit_close_connection(). 4428 */ 4429 if (!conn->conn_transport->rdma_shutdown) { 4430 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4431 if (!sleep) 4432 return; 4433 } 4434 4435 atomic_set(&conn->conn_logout_remove, 0); 4436 complete(&conn->conn_logout_comp); 4437 4438 iscsit_dec_conn_usage_count(conn); 4439 iscsit_stop_session(sess, sleep, sleep); 4440 iscsit_dec_session_usage_count(sess); 4441 iscsit_close_session(sess); 4442 } 4443 4444 static void iscsit_logout_post_handler_samecid( 4445 struct iscsi_conn *conn) 4446 { 4447 int sleep = 1; 4448 4449 if (!conn->conn_transport->rdma_shutdown) { 4450 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4451 if (!sleep) 4452 return; 4453 } 4454 4455 atomic_set(&conn->conn_logout_remove, 0); 4456 complete(&conn->conn_logout_comp); 4457 4458 iscsit_cause_connection_reinstatement(conn, sleep); 4459 iscsit_dec_conn_usage_count(conn); 4460 } 4461 4462 static void iscsit_logout_post_handler_diffcid( 4463 struct iscsi_conn *conn, 4464 u16 cid) 4465 { 4466 struct iscsi_conn *l_conn; 4467 struct iscsi_session *sess = conn->sess; 4468 bool conn_found = false; 4469 4470 if (!sess) 4471 return; 4472 4473 spin_lock_bh(&sess->conn_lock); 4474 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4475 if (l_conn->cid == cid) { 4476 iscsit_inc_conn_usage_count(l_conn); 4477 conn_found = true; 4478 break; 4479 } 4480 } 4481 spin_unlock_bh(&sess->conn_lock); 4482 4483 if (!conn_found) 4484 return; 4485 4486 if (l_conn->sock) 4487 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4488 4489 spin_lock_bh(&l_conn->state_lock); 4490 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4491 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4492 spin_unlock_bh(&l_conn->state_lock); 4493 4494 iscsit_cause_connection_reinstatement(l_conn, 1); 4495 iscsit_dec_conn_usage_count(l_conn); 4496 } 4497 4498 /* 4499 * Return of 0 causes the TX thread to restart. 4500 */ 4501 int iscsit_logout_post_handler( 4502 struct iscsi_cmd *cmd, 4503 struct iscsi_conn *conn) 4504 { 4505 int ret = 0; 4506 4507 switch (cmd->logout_reason) { 4508 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4509 switch (cmd->logout_response) { 4510 case ISCSI_LOGOUT_SUCCESS: 4511 case ISCSI_LOGOUT_CLEANUP_FAILED: 4512 default: 4513 iscsit_logout_post_handler_closesession(conn); 4514 break; 4515 } 4516 ret = 0; 4517 break; 4518 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4519 if (conn->cid == cmd->logout_cid) { 4520 switch (cmd->logout_response) { 4521 case ISCSI_LOGOUT_SUCCESS: 4522 case ISCSI_LOGOUT_CLEANUP_FAILED: 4523 default: 4524 iscsit_logout_post_handler_samecid(conn); 4525 break; 4526 } 4527 ret = 0; 4528 } else { 4529 switch (cmd->logout_response) { 4530 case ISCSI_LOGOUT_SUCCESS: 4531 iscsit_logout_post_handler_diffcid(conn, 4532 cmd->logout_cid); 4533 break; 4534 case ISCSI_LOGOUT_CID_NOT_FOUND: 4535 case ISCSI_LOGOUT_CLEANUP_FAILED: 4536 default: 4537 break; 4538 } 4539 ret = 1; 4540 } 4541 break; 4542 case ISCSI_LOGOUT_REASON_RECOVERY: 4543 switch (cmd->logout_response) { 4544 case ISCSI_LOGOUT_SUCCESS: 4545 case ISCSI_LOGOUT_CID_NOT_FOUND: 4546 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4547 case ISCSI_LOGOUT_CLEANUP_FAILED: 4548 default: 4549 break; 4550 } 4551 ret = 1; 4552 break; 4553 default: 4554 break; 4555 4556 } 4557 return ret; 4558 } 4559 EXPORT_SYMBOL(iscsit_logout_post_handler); 4560 4561 void iscsit_fail_session(struct iscsi_session *sess) 4562 { 4563 struct iscsi_conn *conn; 4564 4565 spin_lock_bh(&sess->conn_lock); 4566 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4567 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4568 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4569 } 4570 spin_unlock_bh(&sess->conn_lock); 4571 4572 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4573 sess->session_state = TARG_SESS_STATE_FAILED; 4574 } 4575 4576 int iscsit_free_session(struct iscsi_session *sess) 4577 { 4578 u16 conn_count = atomic_read(&sess->nconn); 4579 struct iscsi_conn *conn, *conn_tmp = NULL; 4580 int is_last; 4581 4582 spin_lock_bh(&sess->conn_lock); 4583 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4584 4585 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4586 conn_list) { 4587 if (conn_count == 0) 4588 break; 4589 4590 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4591 is_last = 1; 4592 } else { 4593 iscsit_inc_conn_usage_count(conn_tmp); 4594 is_last = 0; 4595 } 4596 iscsit_inc_conn_usage_count(conn); 4597 4598 spin_unlock_bh(&sess->conn_lock); 4599 iscsit_cause_connection_reinstatement(conn, 1); 4600 spin_lock_bh(&sess->conn_lock); 4601 4602 iscsit_dec_conn_usage_count(conn); 4603 if (is_last == 0) 4604 iscsit_dec_conn_usage_count(conn_tmp); 4605 4606 conn_count--; 4607 } 4608 4609 if (atomic_read(&sess->nconn)) { 4610 spin_unlock_bh(&sess->conn_lock); 4611 wait_for_completion(&sess->session_wait_comp); 4612 } else 4613 spin_unlock_bh(&sess->conn_lock); 4614 4615 iscsit_close_session(sess); 4616 return 0; 4617 } 4618 4619 void iscsit_stop_session( 4620 struct iscsi_session *sess, 4621 int session_sleep, 4622 int connection_sleep) 4623 { 4624 u16 conn_count = atomic_read(&sess->nconn); 4625 struct iscsi_conn *conn, *conn_tmp = NULL; 4626 int is_last; 4627 4628 spin_lock_bh(&sess->conn_lock); 4629 if (session_sleep) 4630 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4631 4632 if (connection_sleep) { 4633 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4634 conn_list) { 4635 if (conn_count == 0) 4636 break; 4637 4638 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4639 is_last = 1; 4640 } else { 4641 iscsit_inc_conn_usage_count(conn_tmp); 4642 is_last = 0; 4643 } 4644 iscsit_inc_conn_usage_count(conn); 4645 4646 spin_unlock_bh(&sess->conn_lock); 4647 iscsit_cause_connection_reinstatement(conn, 1); 4648 spin_lock_bh(&sess->conn_lock); 4649 4650 iscsit_dec_conn_usage_count(conn); 4651 if (is_last == 0) 4652 iscsit_dec_conn_usage_count(conn_tmp); 4653 conn_count--; 4654 } 4655 } else { 4656 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4657 iscsit_cause_connection_reinstatement(conn, 0); 4658 } 4659 4660 if (session_sleep && atomic_read(&sess->nconn)) { 4661 spin_unlock_bh(&sess->conn_lock); 4662 wait_for_completion(&sess->session_wait_comp); 4663 } else 4664 spin_unlock_bh(&sess->conn_lock); 4665 } 4666 4667 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4668 { 4669 struct iscsi_session *sess; 4670 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4671 struct se_session *se_sess, *se_sess_tmp; 4672 LIST_HEAD(free_list); 4673 int session_count = 0; 4674 4675 spin_lock_bh(&se_tpg->session_lock); 4676 if (tpg->nsessions && !force) { 4677 spin_unlock_bh(&se_tpg->session_lock); 4678 return -1; 4679 } 4680 4681 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4682 sess_list) { 4683 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4684 4685 spin_lock(&sess->conn_lock); 4686 if (atomic_read(&sess->session_fall_back_to_erl0) || 4687 atomic_read(&sess->session_logout) || 4688 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4689 spin_unlock(&sess->conn_lock); 4690 continue; 4691 } 4692 atomic_set(&sess->session_reinstatement, 1); 4693 atomic_set(&sess->session_fall_back_to_erl0, 1); 4694 spin_unlock(&sess->conn_lock); 4695 4696 list_move_tail(&se_sess->sess_list, &free_list); 4697 } 4698 spin_unlock_bh(&se_tpg->session_lock); 4699 4700 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4701 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4702 4703 iscsit_free_session(sess); 4704 session_count++; 4705 } 4706 4707 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4708 " Group: %hu\n", session_count, tpg->tpgt); 4709 return 0; 4710 } 4711 4712 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4713 MODULE_VERSION("4.1.x"); 4714 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4715 MODULE_LICENSE("GPL"); 4716 4717 module_init(iscsi_target_init_module); 4718 module_exit(iscsi_target_cleanup_module); 4719