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 <linux/crc32c.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 <linux/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/target_core_backend.h> 30 #include <target/iscsi/iscsi_target_core.h> 31 #include "iscsi_target_parameters.h" 32 #include "iscsi_target_seq_pdu_list.h" 33 #include "iscsi_target_datain_values.h" 34 #include "iscsi_target_erl0.h" 35 #include "iscsi_target_erl1.h" 36 #include "iscsi_target_erl2.h" 37 #include "iscsi_target_login.h" 38 #include "iscsi_target_tmr.h" 39 #include "iscsi_target_tpg.h" 40 #include "iscsi_target_util.h" 41 #include "iscsi_target.h" 42 #include "iscsi_target_device.h" 43 #include <target/iscsi/iscsi_target_stat.h> 44 45 #include <target/iscsi/iscsi_transport.h> 46 47 static LIST_HEAD(g_tiqn_list); 48 static LIST_HEAD(g_np_list); 49 static DEFINE_SPINLOCK(tiqn_lock); 50 static DEFINE_MUTEX(np_lock); 51 52 static struct idr tiqn_idr; 53 DEFINE_IDA(sess_ida); 54 struct mutex auth_id_lock; 55 56 struct iscsit_global *iscsit_global; 57 58 struct kmem_cache *lio_qr_cache; 59 struct kmem_cache *lio_dr_cache; 60 struct kmem_cache *lio_ooo_cache; 61 struct kmem_cache *lio_r2t_cache; 62 63 static int iscsit_handle_immediate_data(struct iscsit_cmd *, 64 struct iscsi_scsi_req *, u32); 65 66 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 67 { 68 struct iscsi_tiqn *tiqn = NULL; 69 70 spin_lock(&tiqn_lock); 71 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 72 if (!strcmp(tiqn->tiqn, buf)) { 73 74 spin_lock(&tiqn->tiqn_state_lock); 75 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 76 tiqn->tiqn_access_count++; 77 spin_unlock(&tiqn->tiqn_state_lock); 78 spin_unlock(&tiqn_lock); 79 return tiqn; 80 } 81 spin_unlock(&tiqn->tiqn_state_lock); 82 } 83 } 84 spin_unlock(&tiqn_lock); 85 86 return NULL; 87 } 88 89 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 90 { 91 spin_lock(&tiqn->tiqn_state_lock); 92 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 93 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 94 spin_unlock(&tiqn->tiqn_state_lock); 95 return 0; 96 } 97 spin_unlock(&tiqn->tiqn_state_lock); 98 99 return -1; 100 } 101 102 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 103 { 104 spin_lock(&tiqn->tiqn_state_lock); 105 tiqn->tiqn_access_count--; 106 spin_unlock(&tiqn->tiqn_state_lock); 107 } 108 109 /* 110 * Note that IQN formatting is expected to be done in userspace, and 111 * no explict IQN format checks are done here. 112 */ 113 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 114 { 115 struct iscsi_tiqn *tiqn = NULL; 116 int ret; 117 118 if (strlen(buf) >= ISCSI_IQN_LEN) { 119 pr_err("Target IQN exceeds %d bytes\n", 120 ISCSI_IQN_LEN); 121 return ERR_PTR(-EINVAL); 122 } 123 124 tiqn = kzalloc_obj(*tiqn); 125 if (!tiqn) 126 return ERR_PTR(-ENOMEM); 127 128 sprintf(tiqn->tiqn, "%s", buf); 129 INIT_LIST_HEAD(&tiqn->tiqn_list); 130 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 131 spin_lock_init(&tiqn->tiqn_state_lock); 132 spin_lock_init(&tiqn->tiqn_tpg_lock); 133 spin_lock_init(&tiqn->sess_err_stats.lock); 134 spin_lock_init(&tiqn->login_stats.lock); 135 spin_lock_init(&tiqn->logout_stats.lock); 136 137 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 138 139 idr_preload(GFP_KERNEL); 140 spin_lock(&tiqn_lock); 141 142 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 143 if (ret < 0) { 144 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 145 spin_unlock(&tiqn_lock); 146 idr_preload_end(); 147 kfree(tiqn); 148 return ERR_PTR(ret); 149 } 150 tiqn->tiqn_index = ret; 151 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 152 153 spin_unlock(&tiqn_lock); 154 idr_preload_end(); 155 156 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 157 158 return tiqn; 159 160 } 161 162 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 163 { 164 /* 165 * Wait for accesses to said struct iscsi_tiqn to end. 166 */ 167 spin_lock(&tiqn->tiqn_state_lock); 168 while (tiqn->tiqn_access_count != 0) { 169 spin_unlock(&tiqn->tiqn_state_lock); 170 msleep(10); 171 spin_lock(&tiqn->tiqn_state_lock); 172 } 173 spin_unlock(&tiqn->tiqn_state_lock); 174 } 175 176 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 177 { 178 /* 179 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 180 * while holding tiqn->tiqn_state_lock. This means that all subsequent 181 * attempts to access this struct iscsi_tiqn will fail from both transport 182 * fabric and control code paths. 183 */ 184 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 185 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 186 return; 187 } 188 189 iscsit_wait_for_tiqn(tiqn); 190 191 spin_lock(&tiqn_lock); 192 list_del(&tiqn->tiqn_list); 193 idr_remove(&tiqn_idr, tiqn->tiqn_index); 194 spin_unlock(&tiqn_lock); 195 196 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 197 tiqn->tiqn); 198 kfree(tiqn); 199 } 200 201 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 202 { 203 int ret; 204 /* 205 * Determine if the network portal is accepting storage traffic. 206 */ 207 spin_lock_bh(&np->np_thread_lock); 208 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 209 spin_unlock_bh(&np->np_thread_lock); 210 return -1; 211 } 212 spin_unlock_bh(&np->np_thread_lock); 213 /* 214 * Determine if the portal group is accepting storage traffic. 215 */ 216 spin_lock_bh(&tpg->tpg_state_lock); 217 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 218 spin_unlock_bh(&tpg->tpg_state_lock); 219 return -1; 220 } 221 spin_unlock_bh(&tpg->tpg_state_lock); 222 223 /* 224 * Here we serialize access across the TIQN+TPG Tuple. 225 */ 226 ret = down_interruptible(&tpg->np_login_sem); 227 if (ret != 0) 228 return -1; 229 230 spin_lock_bh(&tpg->tpg_state_lock); 231 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 232 spin_unlock_bh(&tpg->tpg_state_lock); 233 up(&tpg->np_login_sem); 234 return -1; 235 } 236 spin_unlock_bh(&tpg->tpg_state_lock); 237 238 return 0; 239 } 240 241 void iscsit_login_kref_put(struct kref *kref) 242 { 243 struct iscsi_tpg_np *tpg_np = container_of(kref, 244 struct iscsi_tpg_np, tpg_np_kref); 245 246 complete(&tpg_np->tpg_np_comp); 247 } 248 249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 250 struct iscsi_tpg_np *tpg_np) 251 { 252 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 253 254 up(&tpg->np_login_sem); 255 256 if (tpg_np) 257 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 258 259 if (tiqn) 260 iscsit_put_tiqn_for_login(tiqn); 261 262 return 0; 263 } 264 265 bool iscsit_check_np_match( 266 struct sockaddr_storage *sockaddr, 267 struct iscsi_np *np, 268 int network_transport) 269 { 270 struct sockaddr_in *sock_in, *sock_in_e; 271 struct sockaddr_in6 *sock_in6, *sock_in6_e; 272 bool ip_match = false; 273 u16 port, port_e; 274 275 if (sockaddr->ss_family == AF_INET6) { 276 sock_in6 = (struct sockaddr_in6 *)sockaddr; 277 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 278 279 if (!memcmp(&sock_in6->sin6_addr.in6_u, 280 &sock_in6_e->sin6_addr.in6_u, 281 sizeof(struct in6_addr))) 282 ip_match = true; 283 284 port = ntohs(sock_in6->sin6_port); 285 port_e = ntohs(sock_in6_e->sin6_port); 286 } else { 287 sock_in = (struct sockaddr_in *)sockaddr; 288 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 289 290 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 291 ip_match = true; 292 293 port = ntohs(sock_in->sin_port); 294 port_e = ntohs(sock_in_e->sin_port); 295 } 296 297 if (ip_match && (port_e == port) && 298 (np->np_network_transport == network_transport)) 299 return true; 300 301 return false; 302 } 303 304 static struct iscsi_np *iscsit_get_np( 305 struct sockaddr_storage *sockaddr, 306 int network_transport) 307 { 308 struct iscsi_np *np; 309 bool match; 310 311 lockdep_assert_held(&np_lock); 312 313 list_for_each_entry(np, &g_np_list, np_list) { 314 spin_lock_bh(&np->np_thread_lock); 315 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 316 spin_unlock_bh(&np->np_thread_lock); 317 continue; 318 } 319 320 match = iscsit_check_np_match(sockaddr, np, network_transport); 321 if (match) { 322 /* 323 * Increment the np_exports reference count now to 324 * prevent iscsit_del_np() below from being called 325 * while iscsi_tpg_add_network_portal() is called. 326 */ 327 np->np_exports++; 328 spin_unlock_bh(&np->np_thread_lock); 329 return np; 330 } 331 spin_unlock_bh(&np->np_thread_lock); 332 } 333 334 return NULL; 335 } 336 337 struct iscsi_np *iscsit_add_np( 338 struct sockaddr_storage *sockaddr, 339 int network_transport) 340 { 341 struct iscsi_np *np; 342 int ret; 343 344 mutex_lock(&np_lock); 345 346 /* 347 * Locate the existing struct iscsi_np if already active.. 348 */ 349 np = iscsit_get_np(sockaddr, network_transport); 350 if (np) { 351 mutex_unlock(&np_lock); 352 return np; 353 } 354 355 np = kzalloc_obj(*np); 356 if (!np) { 357 mutex_unlock(&np_lock); 358 return ERR_PTR(-ENOMEM); 359 } 360 361 np->np_flags |= NPF_IP_NETWORK; 362 np->np_network_transport = network_transport; 363 spin_lock_init(&np->np_thread_lock); 364 init_completion(&np->np_restart_comp); 365 INIT_LIST_HEAD(&np->np_list); 366 367 ret = iscsi_target_setup_login_socket(np, sockaddr); 368 if (ret != 0) { 369 kfree(np); 370 mutex_unlock(&np_lock); 371 return ERR_PTR(ret); 372 } 373 374 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 375 if (IS_ERR(np->np_thread)) { 376 pr_err("Unable to create kthread: iscsi_np\n"); 377 ret = PTR_ERR(np->np_thread); 378 kfree(np); 379 mutex_unlock(&np_lock); 380 return ERR_PTR(ret); 381 } 382 /* 383 * Increment the np_exports reference count now to prevent 384 * iscsit_del_np() below from being run while a new call to 385 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 386 * active. We don't need to hold np->np_thread_lock at this 387 * point because iscsi_np has not been added to g_np_list yet. 388 */ 389 np->np_exports = 1; 390 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 391 392 list_add_tail(&np->np_list, &g_np_list); 393 mutex_unlock(&np_lock); 394 395 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 396 &np->np_sockaddr, np->np_transport->name); 397 398 return np; 399 } 400 401 int iscsit_reset_np_thread( 402 struct iscsi_np *np, 403 struct iscsi_tpg_np *tpg_np, 404 struct iscsi_portal_group *tpg, 405 bool shutdown) 406 { 407 spin_lock_bh(&np->np_thread_lock); 408 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 409 spin_unlock_bh(&np->np_thread_lock); 410 return 0; 411 } 412 np->np_thread_state = ISCSI_NP_THREAD_RESET; 413 atomic_inc(&np->np_reset_count); 414 415 if (np->np_thread) { 416 spin_unlock_bh(&np->np_thread_lock); 417 send_sig(SIGINT, np->np_thread, 1); 418 wait_for_completion(&np->np_restart_comp); 419 spin_lock_bh(&np->np_thread_lock); 420 } 421 spin_unlock_bh(&np->np_thread_lock); 422 423 if (tpg_np && shutdown) { 424 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 425 426 wait_for_completion(&tpg_np->tpg_np_comp); 427 } 428 429 return 0; 430 } 431 432 static void iscsit_free_np(struct iscsi_np *np) 433 { 434 if (np->np_socket) 435 sock_release(np->np_socket); 436 } 437 438 int iscsit_del_np(struct iscsi_np *np) 439 { 440 spin_lock_bh(&np->np_thread_lock); 441 np->np_exports--; 442 if (np->np_exports) { 443 np->enabled = true; 444 spin_unlock_bh(&np->np_thread_lock); 445 return 0; 446 } 447 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 448 spin_unlock_bh(&np->np_thread_lock); 449 450 if (np->np_thread) { 451 /* 452 * We need to send the signal to wakeup Linux/Net 453 * which may be sleeping in sock_accept().. 454 */ 455 send_sig(SIGINT, np->np_thread, 1); 456 kthread_stop(np->np_thread); 457 np->np_thread = NULL; 458 } 459 460 np->np_transport->iscsit_free_np(np); 461 462 mutex_lock(&np_lock); 463 list_del(&np->np_list); 464 mutex_unlock(&np_lock); 465 466 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 467 &np->np_sockaddr, np->np_transport->name); 468 469 iscsit_put_transport(np->np_transport); 470 kfree(np); 471 return 0; 472 } 473 474 static void iscsit_get_rx_pdu(struct iscsit_conn *); 475 476 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 477 { 478 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 479 } 480 EXPORT_SYMBOL(iscsit_queue_rsp); 481 482 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 483 { 484 spin_lock_bh(&conn->cmd_lock); 485 if (!list_empty(&cmd->i_conn_node)) 486 list_del_init(&cmd->i_conn_node); 487 spin_unlock_bh(&conn->cmd_lock); 488 489 __iscsit_free_cmd(cmd, true); 490 } 491 EXPORT_SYMBOL(iscsit_aborted_task); 492 493 static u32 iscsit_crc_buf(const void *buf, u32 payload_length, 494 u32 padding, const void *pad_bytes); 495 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *); 496 497 static int 498 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 499 const void *data_buf, u32 data_buf_len) 500 { 501 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 502 struct kvec *iov; 503 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 504 int ret; 505 506 iov = &cmd->iov_misc[0]; 507 iov[niov].iov_base = cmd->pdu; 508 iov[niov++].iov_len = ISCSI_HDR_LEN; 509 510 if (conn->conn_ops->HeaderDigest) { 511 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 512 513 *header_digest = iscsit_crc_buf(hdr, ISCSI_HDR_LEN, 0, NULL); 514 515 iov[0].iov_len += ISCSI_CRC_LEN; 516 tx_size += ISCSI_CRC_LEN; 517 pr_debug("Attaching CRC32C HeaderDigest" 518 " to opcode 0x%x 0x%08x\n", 519 hdr->opcode, *header_digest); 520 } 521 522 if (data_buf_len) { 523 u32 padding = ((-data_buf_len) & 3); 524 525 iov[niov].iov_base = (void *)data_buf; 526 iov[niov++].iov_len = data_buf_len; 527 tx_size += data_buf_len; 528 529 if (padding != 0) { 530 iov[niov].iov_base = &cmd->pad_bytes; 531 iov[niov++].iov_len = padding; 532 tx_size += padding; 533 pr_debug("Attaching %u additional" 534 " padding bytes.\n", padding); 535 } 536 537 if (conn->conn_ops->DataDigest) { 538 cmd->data_crc = iscsit_crc_buf(data_buf, data_buf_len, 539 padding, 540 &cmd->pad_bytes); 541 iov[niov].iov_base = &cmd->data_crc; 542 iov[niov++].iov_len = ISCSI_CRC_LEN; 543 tx_size += ISCSI_CRC_LEN; 544 pr_debug("Attached DataDigest for %u" 545 " bytes opcode 0x%x, CRC 0x%08x\n", 546 data_buf_len, hdr->opcode, cmd->data_crc); 547 } 548 } 549 550 cmd->iov_misc_count = niov; 551 cmd->tx_size = tx_size; 552 553 ret = iscsit_send_tx_data(cmd, conn, 1); 554 if (ret < 0) { 555 iscsit_tx_thread_wait_for_tcp(conn); 556 return ret; 557 } 558 559 return 0; 560 } 561 562 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 563 u32 data_offset, u32 data_length); 564 static void iscsit_unmap_iovec(struct iscsit_cmd *); 565 static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length, 566 u32 padding, const u8 *pad_bytes); 567 static int 568 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 569 const struct iscsi_datain *datain) 570 { 571 struct kvec *iov; 572 u32 iov_count = 0, tx_size = 0; 573 int ret, iov_ret; 574 575 iov = &cmd->iov_data[0]; 576 iov[iov_count].iov_base = cmd->pdu; 577 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 578 tx_size += ISCSI_HDR_LEN; 579 580 if (conn->conn_ops->HeaderDigest) { 581 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 582 583 *header_digest = iscsit_crc_buf(cmd->pdu, ISCSI_HDR_LEN, 0, 584 NULL); 585 iov[0].iov_len += ISCSI_CRC_LEN; 586 tx_size += ISCSI_CRC_LEN; 587 588 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 589 *header_digest); 590 } 591 592 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count], 593 cmd->orig_iov_data_count - (iov_count + 2), 594 datain->offset, datain->length); 595 if (iov_ret < 0) 596 return -1; 597 598 iov_count += iov_ret; 599 tx_size += datain->length; 600 601 cmd->padding = ((-datain->length) & 3); 602 if (cmd->padding) { 603 iov[iov_count].iov_base = cmd->pad_bytes; 604 iov[iov_count++].iov_len = cmd->padding; 605 tx_size += cmd->padding; 606 607 pr_debug("Attaching %u padding bytes\n", cmd->padding); 608 } 609 610 if (conn->conn_ops->DataDigest) { 611 cmd->data_crc = iscsit_crc_sglist(cmd, datain->length, 612 cmd->padding, cmd->pad_bytes); 613 iov[iov_count].iov_base = &cmd->data_crc; 614 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 615 tx_size += ISCSI_CRC_LEN; 616 617 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 618 datain->length + cmd->padding, cmd->data_crc); 619 } 620 621 cmd->iov_data_count = iov_count; 622 cmd->tx_size = tx_size; 623 624 ret = iscsit_fe_sendpage_sg(cmd, conn); 625 626 iscsit_unmap_iovec(cmd); 627 628 if (ret < 0) { 629 iscsit_tx_thread_wait_for_tcp(conn); 630 return ret; 631 } 632 633 return 0; 634 } 635 636 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 637 struct iscsi_datain_req *dr, const void *buf, 638 u32 buf_len) 639 { 640 if (dr) 641 return iscsit_xmit_datain_pdu(conn, cmd, buf); 642 else 643 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 644 } 645 646 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn) 647 { 648 return TARGET_PROT_NORMAL; 649 } 650 651 static struct iscsit_transport iscsi_target_transport = { 652 .name = "iSCSI/TCP", 653 .transport_type = ISCSI_TCP, 654 .rdma_shutdown = false, 655 .owner = NULL, 656 .iscsit_setup_np = iscsit_setup_np, 657 .iscsit_accept_np = iscsit_accept_np, 658 .iscsit_free_np = iscsit_free_np, 659 .iscsit_get_login_rx = iscsit_get_login_rx, 660 .iscsit_put_login_tx = iscsit_put_login_tx, 661 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 662 .iscsit_immediate_queue = iscsit_immediate_queue, 663 .iscsit_response_queue = iscsit_response_queue, 664 .iscsit_queue_data_in = iscsit_queue_rsp, 665 .iscsit_queue_status = iscsit_queue_rsp, 666 .iscsit_aborted_task = iscsit_aborted_task, 667 .iscsit_xmit_pdu = iscsit_xmit_pdu, 668 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 669 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 670 }; 671 672 static int __init iscsi_target_init_module(void) 673 { 674 int ret = 0, size; 675 676 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 677 iscsit_global = kzalloc_obj(*iscsit_global); 678 if (!iscsit_global) 679 return -1; 680 681 spin_lock_init(&iscsit_global->ts_bitmap_lock); 682 mutex_init(&auth_id_lock); 683 idr_init(&tiqn_idr); 684 685 ret = target_register_template(&iscsi_ops); 686 if (ret) 687 goto out; 688 689 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 690 iscsit_global->ts_bitmap = vzalloc(size); 691 if (!iscsit_global->ts_bitmap) 692 goto configfs_out; 693 694 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) { 695 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n"); 696 goto bitmap_out; 697 } 698 cpumask_setall(iscsit_global->allowed_cpumask); 699 700 lio_qr_cache = kmem_cache_create("lio_qr_cache", 701 sizeof(struct iscsi_queue_req), 702 __alignof__(struct iscsi_queue_req), 0, NULL); 703 if (!lio_qr_cache) { 704 pr_err("Unable to kmem_cache_create() for" 705 " lio_qr_cache\n"); 706 goto cpumask_out; 707 } 708 709 lio_dr_cache = kmem_cache_create("lio_dr_cache", 710 sizeof(struct iscsi_datain_req), 711 __alignof__(struct iscsi_datain_req), 0, NULL); 712 if (!lio_dr_cache) { 713 pr_err("Unable to kmem_cache_create() for" 714 " lio_dr_cache\n"); 715 goto qr_out; 716 } 717 718 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 719 sizeof(struct iscsi_ooo_cmdsn), 720 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 721 if (!lio_ooo_cache) { 722 pr_err("Unable to kmem_cache_create() for" 723 " lio_ooo_cache\n"); 724 goto dr_out; 725 } 726 727 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 728 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 729 0, NULL); 730 if (!lio_r2t_cache) { 731 pr_err("Unable to kmem_cache_create() for" 732 " lio_r2t_cache\n"); 733 goto ooo_out; 734 } 735 736 iscsit_register_transport(&iscsi_target_transport); 737 738 if (iscsit_load_discovery_tpg() < 0) 739 goto r2t_out; 740 741 return ret; 742 r2t_out: 743 iscsit_unregister_transport(&iscsi_target_transport); 744 kmem_cache_destroy(lio_r2t_cache); 745 ooo_out: 746 kmem_cache_destroy(lio_ooo_cache); 747 dr_out: 748 kmem_cache_destroy(lio_dr_cache); 749 qr_out: 750 kmem_cache_destroy(lio_qr_cache); 751 cpumask_out: 752 free_cpumask_var(iscsit_global->allowed_cpumask); 753 bitmap_out: 754 vfree(iscsit_global->ts_bitmap); 755 configfs_out: 756 /* XXX: this probably wants it to be it's own unwind step.. */ 757 if (iscsit_global->discovery_tpg) 758 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 759 target_unregister_template(&iscsi_ops); 760 out: 761 kfree(iscsit_global); 762 return -ENOMEM; 763 } 764 765 static void __exit iscsi_target_cleanup_module(void) 766 { 767 iscsit_release_discovery_tpg(); 768 iscsit_unregister_transport(&iscsi_target_transport); 769 kmem_cache_destroy(lio_qr_cache); 770 kmem_cache_destroy(lio_dr_cache); 771 kmem_cache_destroy(lio_ooo_cache); 772 kmem_cache_destroy(lio_r2t_cache); 773 774 /* 775 * Shutdown discovery sessions and disable discovery TPG 776 */ 777 if (iscsit_global->discovery_tpg) 778 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 779 780 target_unregister_template(&iscsi_ops); 781 782 free_cpumask_var(iscsit_global->allowed_cpumask); 783 vfree(iscsit_global->ts_bitmap); 784 kfree(iscsit_global); 785 } 786 787 int iscsit_add_reject( 788 struct iscsit_conn *conn, 789 u8 reason, 790 unsigned char *buf) 791 { 792 struct iscsit_cmd *cmd; 793 794 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 795 if (!cmd) 796 return -1; 797 798 cmd->iscsi_opcode = ISCSI_OP_REJECT; 799 cmd->reject_reason = reason; 800 801 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 802 if (!cmd->buf_ptr) { 803 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 804 iscsit_free_cmd(cmd, false); 805 return -1; 806 } 807 808 spin_lock_bh(&conn->cmd_lock); 809 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 810 spin_unlock_bh(&conn->cmd_lock); 811 812 cmd->i_state = ISTATE_SEND_REJECT; 813 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 814 815 return -1; 816 } 817 EXPORT_SYMBOL(iscsit_add_reject); 818 819 static int iscsit_add_reject_from_cmd( 820 struct iscsit_cmd *cmd, 821 u8 reason, 822 bool add_to_conn, 823 unsigned char *buf) 824 { 825 struct iscsit_conn *conn; 826 const bool do_put = cmd->se_cmd.se_tfo != NULL; 827 828 if (!cmd->conn) { 829 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 830 cmd->init_task_tag); 831 return -1; 832 } 833 conn = cmd->conn; 834 835 cmd->iscsi_opcode = ISCSI_OP_REJECT; 836 cmd->reject_reason = reason; 837 838 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 839 if (!cmd->buf_ptr) { 840 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 841 iscsit_free_cmd(cmd, false); 842 return -1; 843 } 844 845 if (add_to_conn) { 846 spin_lock_bh(&conn->cmd_lock); 847 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 848 spin_unlock_bh(&conn->cmd_lock); 849 } 850 851 cmd->i_state = ISTATE_SEND_REJECT; 852 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 853 /* 854 * Perform the kref_put now if se_cmd has already been setup by 855 * scsit_setup_scsi_cmd() 856 */ 857 if (do_put) { 858 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 859 target_put_sess_cmd(&cmd->se_cmd); 860 } 861 return -1; 862 } 863 864 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason, 865 unsigned char *buf) 866 { 867 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 868 } 869 870 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf) 871 { 872 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 873 } 874 EXPORT_SYMBOL(iscsit_reject_cmd); 875 876 /* 877 * Map some portion of the allocated scatterlist to an iovec, suitable for 878 * kernel sockets to copy data in/out. 879 */ 880 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 881 u32 data_offset, u32 data_length) 882 { 883 u32 i = 0, orig_data_length = data_length; 884 struct scatterlist *sg; 885 unsigned int page_off; 886 887 /* 888 * We know each entry in t_data_sg contains a page. 889 */ 890 u32 ent = data_offset / PAGE_SIZE; 891 892 if (!data_length) 893 return 0; 894 895 if (ent >= cmd->se_cmd.t_data_nents) { 896 pr_err("Initial page entry out-of-bounds\n"); 897 goto overflow; 898 } 899 900 sg = &cmd->se_cmd.t_data_sg[ent]; 901 page_off = (data_offset % PAGE_SIZE); 902 903 cmd->first_data_sg = sg; 904 cmd->first_data_sg_off = page_off; 905 906 while (data_length) { 907 u32 cur_len; 908 909 if (WARN_ON_ONCE(!sg || i >= nvec)) 910 goto overflow; 911 912 cur_len = min_t(u32, data_length, sg->length - page_off); 913 914 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 915 iov[i].iov_len = cur_len; 916 917 data_length -= cur_len; 918 page_off = 0; 919 sg = sg_next(sg); 920 i++; 921 } 922 923 cmd->kmapped_nents = i; 924 925 return i; 926 927 overflow: 928 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n", 929 data_offset, orig_data_length, i, nvec); 930 for_each_sg(cmd->se_cmd.t_data_sg, sg, 931 cmd->se_cmd.t_data_nents, i) { 932 pr_err("[%d] off %d len %d\n", 933 i, sg->offset, sg->length); 934 } 935 return -1; 936 } 937 938 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd) 939 { 940 u32 i; 941 struct scatterlist *sg; 942 943 sg = cmd->first_data_sg; 944 945 for (i = 0; i < cmd->kmapped_nents; i++) 946 kunmap(sg_page(&sg[i])); 947 } 948 949 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn) 950 { 951 LIST_HEAD(ack_list); 952 struct iscsit_cmd *cmd, *cmd_p; 953 954 conn->exp_statsn = exp_statsn; 955 956 if (conn->sess->sess_ops->RDMAExtensions) 957 return; 958 959 spin_lock_bh(&conn->cmd_lock); 960 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 961 spin_lock(&cmd->istate_lock); 962 if ((cmd->i_state == ISTATE_SENT_STATUS) && 963 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 964 cmd->i_state = ISTATE_REMOVE; 965 spin_unlock(&cmd->istate_lock); 966 list_move_tail(&cmd->i_conn_node, &ack_list); 967 continue; 968 } 969 spin_unlock(&cmd->istate_lock); 970 } 971 spin_unlock_bh(&conn->cmd_lock); 972 973 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 974 list_del_init(&cmd->i_conn_node); 975 iscsit_free_cmd(cmd, false); 976 } 977 } 978 979 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd) 980 { 981 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 982 983 iov_count += ISCSI_IOV_DATA_BUFFER; 984 cmd->iov_data = kzalloc_objs(*cmd->iov_data, iov_count); 985 if (!cmd->iov_data) 986 return -ENOMEM; 987 988 cmd->orig_iov_data_count = iov_count; 989 return 0; 990 } 991 992 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 993 unsigned char *buf) 994 { 995 int data_direction, payload_length; 996 struct iscsi_ecdb_ahdr *ecdb_ahdr; 997 struct iscsi_scsi_req *hdr; 998 u16 ahslength, cdb_length; 999 int iscsi_task_attr; 1000 unsigned char *cdb; 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 cdb = hdr->cdb; 1102 1103 if (hdr->hlength) { 1104 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1); 1105 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) { 1106 pr_err("Additional Header Segment type %d not supported!\n", 1107 ecdb_ahdr->ahstype); 1108 return iscsit_add_reject_cmd(cmd, 1109 ISCSI_REASON_CMD_NOT_SUPPORTED, buf); 1110 } 1111 1112 ahslength = be16_to_cpu(ecdb_ahdr->ahslength); 1113 if (!ahslength) { 1114 pr_err("Extended CDB AHS with zero length, protocol error.\n"); 1115 return iscsit_add_reject_cmd(cmd, 1116 ISCSI_REASON_PROTOCOL_ERROR, buf); 1117 } 1118 if (ahslength > (hdr->hlength * 4) - 3) { 1119 pr_err("Extended CDB AHS length %u exceeds available PDU buffer.\n", 1120 ahslength); 1121 return iscsit_add_reject_cmd(cmd, 1122 ISCSI_REASON_PROTOCOL_ERROR, buf); 1123 } 1124 1125 cdb_length = ahslength - 1 + ISCSI_CDB_SIZE; 1126 1127 cdb = kmalloc(cdb_length, GFP_KERNEL); 1128 if (cdb == NULL) 1129 return iscsit_add_reject_cmd(cmd, 1130 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1131 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE); 1132 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb, cdb_length - ISCSI_CDB_SIZE); 1133 } 1134 1135 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1136 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1137 DMA_NONE; 1138 1139 cmd->data_direction = data_direction; 1140 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1141 /* 1142 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1143 */ 1144 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1145 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1146 sam_task_attr = TCM_SIMPLE_TAG; 1147 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1148 sam_task_attr = TCM_ORDERED_TAG; 1149 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1150 sam_task_attr = TCM_HEAD_TAG; 1151 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1152 sam_task_attr = TCM_ACA_TAG; 1153 else { 1154 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1155 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1156 sam_task_attr = TCM_SIMPLE_TAG; 1157 } 1158 1159 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1160 cmd->i_state = ISTATE_NEW_CMD; 1161 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1162 cmd->immediate_data = (payload_length) ? 1 : 0; 1163 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1164 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1165 if (cmd->unsolicited_data) 1166 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1167 1168 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1169 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1170 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1171 else 1172 cmd->targ_xfer_tag = 0xFFFFFFFF; 1173 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1174 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1175 cmd->first_burst_len = payload_length; 1176 1177 if (!conn->sess->sess_ops->RDMAExtensions && 1178 cmd->data_direction == DMA_FROM_DEVICE) { 1179 struct iscsi_datain_req *dr; 1180 1181 dr = iscsit_allocate_datain_req(); 1182 if (!dr) { 1183 if (cdb != hdr->cdb) 1184 kfree(cdb); 1185 return iscsit_add_reject_cmd(cmd, 1186 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1187 } 1188 1189 iscsit_attach_datain_req(cmd, dr); 1190 } 1191 1192 /* 1193 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1194 */ 1195 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 1196 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1197 cmd->data_direction, sam_task_attr, 1198 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun), 1199 conn->cmd_cnt); 1200 1201 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1202 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1203 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1204 conn->cid); 1205 1206 target_get_sess_cmd(&cmd->se_cmd, true); 1207 1208 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1209 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb, 1210 GFP_KERNEL); 1211 1212 if (cdb != hdr->cdb) 1213 kfree(cdb); 1214 1215 if (cmd->sense_reason) { 1216 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1217 return iscsit_add_reject_cmd(cmd, 1218 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1219 } 1220 1221 goto attach_cmd; 1222 } 1223 1224 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd); 1225 if (cmd->sense_reason) 1226 goto attach_cmd; 1227 1228 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd); 1229 if (cmd->sense_reason) 1230 goto attach_cmd; 1231 1232 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1233 return iscsit_add_reject_cmd(cmd, 1234 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1235 } 1236 1237 attach_cmd: 1238 spin_lock_bh(&conn->cmd_lock); 1239 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1240 spin_unlock_bh(&conn->cmd_lock); 1241 return 0; 1242 } 1243 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1244 1245 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd) 1246 { 1247 iscsit_set_dataout_sequence_values(cmd); 1248 1249 spin_lock_bh(&cmd->dataout_timeout_lock); 1250 iscsit_start_dataout_timer(cmd, cmd->conn); 1251 spin_unlock_bh(&cmd->dataout_timeout_lock); 1252 } 1253 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); 1254 1255 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1256 struct iscsi_scsi_req *hdr) 1257 { 1258 int cmdsn_ret = 0; 1259 /* 1260 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1261 * the Immediate Bit is not set, and no Immediate 1262 * Data is attached. 1263 * 1264 * A PDU/CmdSN carrying Immediate Data can only 1265 * be processed after the DataCRC has passed. 1266 * If the DataCRC fails, the CmdSN MUST NOT 1267 * be acknowledged. (See below) 1268 */ 1269 if (!cmd->immediate_data) { 1270 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1271 (unsigned char *)hdr, hdr->cmdsn); 1272 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1273 return -1; 1274 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1275 target_put_sess_cmd(&cmd->se_cmd); 1276 return 0; 1277 } 1278 } 1279 1280 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1281 1282 /* 1283 * If no Immediate Data is attached, it's OK to return now. 1284 */ 1285 if (!cmd->immediate_data) { 1286 if (!cmd->sense_reason && cmd->unsolicited_data) 1287 iscsit_set_unsolicited_dataout(cmd); 1288 if (!cmd->sense_reason) 1289 return 0; 1290 1291 target_put_sess_cmd(&cmd->se_cmd); 1292 return 0; 1293 } 1294 1295 /* 1296 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1297 * execution. These exceptions are processed in CmdSN order using 1298 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1299 */ 1300 if (cmd->sense_reason) 1301 return 1; 1302 /* 1303 * Call directly into transport_generic_new_cmd() to perform 1304 * the backend memory allocation. 1305 */ 1306 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1307 if (cmd->sense_reason) 1308 return 1; 1309 1310 return 0; 1311 } 1312 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1313 1314 static int 1315 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr, 1316 bool dump_payload) 1317 { 1318 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1319 int rc; 1320 1321 /* 1322 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1323 */ 1324 if (dump_payload) { 1325 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, 1326 cmd->first_burst_len); 1327 1328 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", 1329 cmd->se_cmd.data_length, cmd->write_data_done, 1330 cmd->first_burst_len, length); 1331 rc = iscsit_dump_data_payload(cmd->conn, length, 1); 1332 pr_debug("Finished dumping immediate data\n"); 1333 if (rc < 0) 1334 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; 1335 } else { 1336 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1337 cmd->first_burst_len); 1338 } 1339 1340 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1341 /* 1342 * A PDU/CmdSN carrying Immediate Data passed 1343 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1344 * Immediate Bit is not set. 1345 */ 1346 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1347 (unsigned char *)hdr, hdr->cmdsn); 1348 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1349 return -1; 1350 1351 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1352 target_put_sess_cmd(&cmd->se_cmd); 1353 1354 return 0; 1355 } else if (cmd->unsolicited_data) 1356 iscsit_set_unsolicited_dataout(cmd); 1357 1358 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1359 /* 1360 * Immediate Data failed DataCRC and ERL>=1, 1361 * silently drop this PDU and let the initiator 1362 * plug the CmdSN gap. 1363 * 1364 * FIXME: Send Unsolicited NOPIN with reserved 1365 * TTT here to help the initiator figure out 1366 * the missing CmdSN, although they should be 1367 * intelligent enough to determine the missing 1368 * CmdSN and issue a retry to plug the sequence. 1369 */ 1370 cmd->i_state = ISTATE_REMOVE; 1371 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1372 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1373 return -1; 1374 1375 return 0; 1376 } 1377 1378 static int 1379 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1380 unsigned char *buf) 1381 { 1382 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1383 int rc, immed_data; 1384 bool dump_payload = false; 1385 1386 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1387 if (rc < 0) 1388 return 0; 1389 /* 1390 * Allocation iovecs needed for struct socket operations for 1391 * traditional iSCSI block I/O. 1392 */ 1393 if (iscsit_allocate_iovecs(cmd) < 0) { 1394 return iscsit_reject_cmd(cmd, 1395 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1396 } 1397 immed_data = cmd->immediate_data; 1398 1399 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1400 if (rc < 0) 1401 return rc; 1402 else if (rc > 0) 1403 dump_payload = true; 1404 1405 if (!immed_data) 1406 return 0; 1407 1408 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1409 } 1410 1411 static u32 iscsit_crc_sglist(const struct iscsit_cmd *cmd, u32 data_length, 1412 u32 padding, const u8 *pad_bytes) 1413 { 1414 struct scatterlist *sg = cmd->first_data_sg; 1415 unsigned int page_off = cmd->first_data_sg_off; 1416 u32 crc = ~0; 1417 1418 while (data_length) { 1419 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 1420 const void *virt; 1421 1422 virt = kmap_local_page(sg_page(sg)) + sg->offset + page_off; 1423 crc = crc32c(crc, virt, cur_len); 1424 kunmap_local(virt); 1425 1426 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1427 sg = sg_next(sg); 1428 1429 page_off = 0; 1430 data_length -= cur_len; 1431 } 1432 1433 if (padding) 1434 crc = crc32c(crc, pad_bytes, padding); 1435 1436 return ~crc; 1437 } 1438 1439 static u32 iscsit_crc_buf(const void *buf, u32 payload_length, 1440 u32 padding, const void *pad_bytes) 1441 { 1442 u32 crc = ~0; 1443 1444 crc = crc32c(crc, buf, payload_length); 1445 1446 if (padding) 1447 crc = crc32c(crc, pad_bytes, padding); 1448 1449 return ~crc; 1450 } 1451 1452 int 1453 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1454 struct iscsit_cmd *cmd, u32 payload_length, 1455 bool *success) 1456 { 1457 struct iscsi_data *hdr = buf; 1458 struct se_cmd *se_cmd; 1459 int rc; 1460 1461 /* iSCSI write */ 1462 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1463 1464 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1465 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1466 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1467 payload_length, conn->cid); 1468 1469 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1470 pr_err("Command ITT: 0x%08x received DataOUT after" 1471 " last DataOUT received, dumping payload\n", 1472 cmd->init_task_tag); 1473 return iscsit_dump_data_payload(conn, payload_length, 1); 1474 } 1475 1476 if (cmd->data_direction != DMA_TO_DEVICE) { 1477 pr_err("Command ITT: 0x%08x received DataOUT for a" 1478 " NON-WRITE command.\n", cmd->init_task_tag); 1479 return iscsit_dump_data_payload(conn, payload_length, 1); 1480 } 1481 se_cmd = &cmd->se_cmd; 1482 iscsit_mod_dataout_timer(cmd); 1483 1484 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1485 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1486 be32_to_cpu(hdr->offset), payload_length, 1487 cmd->se_cmd.data_length); 1488 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1489 } 1490 1491 if (cmd->unsolicited_data) { 1492 int dump_unsolicited_data = 0; 1493 1494 if (conn->sess->sess_ops->InitialR2T) { 1495 pr_err("Received unexpected unsolicited data" 1496 " while InitialR2T=Yes, protocol error.\n"); 1497 transport_send_check_condition_and_sense(&cmd->se_cmd, 1498 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1499 return -1; 1500 } 1501 /* 1502 * Special case for dealing with Unsolicited DataOUT 1503 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1504 * failures; 1505 */ 1506 1507 /* Something's amiss if we're not in WRITE_PENDING state... */ 1508 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1509 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1510 dump_unsolicited_data = 1; 1511 1512 if (dump_unsolicited_data) { 1513 /* 1514 * Check if a delayed TASK_ABORTED status needs to 1515 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1516 * received with the unsolicited data out. 1517 */ 1518 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1519 iscsit_stop_dataout_timer(cmd); 1520 1521 return iscsit_dump_data_payload(conn, payload_length, 1); 1522 } 1523 } else { 1524 /* 1525 * For the normal solicited data path: 1526 * 1527 * Check for a delayed TASK_ABORTED status and dump any 1528 * incoming data out payload if one exists. Also, when the 1529 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1530 * data out sequence, we decrement outstanding_r2ts. Once 1531 * outstanding_r2ts reaches zero, go ahead and send the delayed 1532 * TASK_ABORTED status. 1533 */ 1534 if (se_cmd->transport_state & CMD_T_ABORTED) { 1535 if (hdr->flags & ISCSI_FLAG_CMD_FINAL && 1536 --cmd->outstanding_r2ts < 1) 1537 iscsit_stop_dataout_timer(cmd); 1538 1539 return iscsit_dump_data_payload(conn, payload_length, 1); 1540 } 1541 } 1542 /* 1543 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1544 * within-command recovery checks before receiving the payload. 1545 */ 1546 rc = iscsit_check_pre_dataout(cmd, buf); 1547 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1548 return 0; 1549 else if (rc == DATAOUT_CANNOT_RECOVER) 1550 return -1; 1551 *success = true; 1552 return 0; 1553 } 1554 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1555 1556 int 1557 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1558 struct iscsit_cmd **out_cmd) 1559 { 1560 struct iscsi_data *hdr = buf; 1561 struct iscsit_cmd *cmd; 1562 u32 payload_length = ntoh24(hdr->dlength); 1563 int rc; 1564 bool success = false; 1565 1566 if (!payload_length) { 1567 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1568 return 0; 1569 } 1570 1571 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1572 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1573 " MaxXmitDataSegmentLength: %u\n", payload_length, 1574 conn->conn_ops->MaxXmitDataSegmentLength); 1575 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1576 } 1577 1578 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1579 if (!cmd) 1580 return 0; 1581 1582 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1583 1584 if (success) 1585 *out_cmd = cmd; 1586 1587 return rc; 1588 } 1589 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1590 1591 static int 1592 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1593 struct iscsi_data *hdr) 1594 { 1595 struct kvec *iov; 1596 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1597 u32 payload_length; 1598 int iov_ret, data_crc_failed = 0; 1599 1600 payload_length = min_t(u32, cmd->se_cmd.data_length, 1601 ntoh24(hdr->dlength)); 1602 rx_size += payload_length; 1603 iov = &cmd->iov_data[0]; 1604 1605 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, 1606 be32_to_cpu(hdr->offset), payload_length); 1607 if (iov_ret < 0) 1608 return -1; 1609 1610 iov_count += iov_ret; 1611 1612 padding = ((-payload_length) & 3); 1613 if (padding != 0) { 1614 iov[iov_count].iov_base = cmd->pad_bytes; 1615 iov[iov_count++].iov_len = padding; 1616 rx_size += padding; 1617 pr_debug("Receiving %u padding bytes.\n", padding); 1618 } 1619 1620 if (conn->conn_ops->DataDigest) { 1621 iov[iov_count].iov_base = &checksum; 1622 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1623 rx_size += ISCSI_CRC_LEN; 1624 } 1625 1626 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 1627 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1628 1629 iscsit_unmap_iovec(cmd); 1630 1631 if (rx_got != rx_size) 1632 return -1; 1633 1634 if (conn->conn_ops->DataDigest) { 1635 u32 data_crc; 1636 1637 data_crc = iscsit_crc_sglist(cmd, payload_length, padding, 1638 cmd->pad_bytes); 1639 if (checksum != data_crc) { 1640 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1641 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1642 " does not match computed 0x%08x\n", 1643 hdr->itt, hdr->offset, payload_length, 1644 hdr->datasn, checksum, data_crc); 1645 data_crc_failed = 1; 1646 } else { 1647 pr_debug("Got CRC32C DataDigest 0x%08x for" 1648 " %u bytes of Data Out\n", checksum, 1649 payload_length); 1650 } 1651 } 1652 1653 return data_crc_failed; 1654 } 1655 1656 int 1657 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr, 1658 bool data_crc_failed) 1659 { 1660 struct iscsit_conn *conn = cmd->conn; 1661 int rc, ooo_cmdsn; 1662 /* 1663 * Increment post receive data and CRC values or perform 1664 * within-command recovery. 1665 */ 1666 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1667 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1668 return 0; 1669 else if (rc == DATAOUT_SEND_R2T) { 1670 iscsit_set_dataout_sequence_values(cmd); 1671 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1672 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1673 /* 1674 * Handle extra special case for out of order 1675 * Unsolicited Data Out. 1676 */ 1677 spin_lock_bh(&cmd->istate_lock); 1678 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1679 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1680 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1681 spin_unlock_bh(&cmd->istate_lock); 1682 1683 iscsit_stop_dataout_timer(cmd); 1684 if (ooo_cmdsn) 1685 return 0; 1686 target_execute_cmd(&cmd->se_cmd); 1687 return 0; 1688 } else /* DATAOUT_CANNOT_RECOVER */ 1689 return -1; 1690 1691 return 0; 1692 } 1693 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1694 1695 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf) 1696 { 1697 struct iscsit_cmd *cmd = NULL; 1698 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1699 int rc; 1700 bool data_crc_failed = false; 1701 1702 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1703 if (rc < 0) 1704 return 0; 1705 else if (!cmd) 1706 return 0; 1707 1708 rc = iscsit_get_dataout(conn, cmd, hdr); 1709 if (rc < 0) 1710 return rc; 1711 else if (rc > 0) 1712 data_crc_failed = true; 1713 1714 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1715 } 1716 1717 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1718 struct iscsi_nopout *hdr) 1719 { 1720 u32 payload_length = ntoh24(hdr->dlength); 1721 1722 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1723 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1724 if (!cmd) 1725 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1726 (unsigned char *)hdr); 1727 1728 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1729 (unsigned char *)hdr); 1730 } 1731 1732 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1733 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1734 " not set, protocol error.\n"); 1735 if (!cmd) 1736 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1737 (unsigned char *)hdr); 1738 1739 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1740 (unsigned char *)hdr); 1741 } 1742 1743 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1744 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1745 " greater than MaxXmitDataSegmentLength: %u, protocol" 1746 " error.\n", payload_length, 1747 conn->conn_ops->MaxXmitDataSegmentLength); 1748 if (!cmd) 1749 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1750 (unsigned char *)hdr); 1751 1752 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1753 (unsigned char *)hdr); 1754 } 1755 1756 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1757 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1758 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1759 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1760 payload_length); 1761 /* 1762 * This is not a response to a Unsolicited NopIN, which means 1763 * it can either be a NOPOUT ping request (with a valid ITT), 1764 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1765 * Either way, make sure we allocate an struct iscsit_cmd, as both 1766 * can contain ping data. 1767 */ 1768 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1769 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1770 cmd->i_state = ISTATE_SEND_NOPIN; 1771 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1772 1 : 0); 1773 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1774 cmd->targ_xfer_tag = 0xFFFFFFFF; 1775 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1776 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1777 cmd->data_direction = DMA_NONE; 1778 } 1779 1780 return 0; 1781 } 1782 EXPORT_SYMBOL(iscsit_setup_nop_out); 1783 1784 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1785 struct iscsi_nopout *hdr) 1786 { 1787 struct iscsit_cmd *cmd_p = NULL; 1788 int cmdsn_ret = 0; 1789 /* 1790 * Initiator is expecting a NopIN ping reply.. 1791 */ 1792 if (hdr->itt != RESERVED_ITT) { 1793 if (!cmd) 1794 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1795 (unsigned char *)hdr); 1796 1797 spin_lock_bh(&conn->cmd_lock); 1798 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1799 spin_unlock_bh(&conn->cmd_lock); 1800 1801 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1802 1803 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1804 iscsit_add_cmd_to_response_queue(cmd, conn, 1805 cmd->i_state); 1806 return 0; 1807 } 1808 1809 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1810 (unsigned char *)hdr, hdr->cmdsn); 1811 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1812 return 0; 1813 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1814 return -1; 1815 1816 return 0; 1817 } 1818 /* 1819 * This was a response to a unsolicited NOPIN ping. 1820 */ 1821 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1822 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1823 if (!cmd_p) 1824 return -EINVAL; 1825 1826 iscsit_stop_nopin_response_timer(conn); 1827 1828 cmd_p->i_state = ISTATE_REMOVE; 1829 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1830 1831 iscsit_start_nopin_timer(conn); 1832 return 0; 1833 } 1834 /* 1835 * Otherwise, initiator is not expecting a NOPIN is response. 1836 * Just ignore for now. 1837 */ 1838 1839 if (cmd) 1840 iscsit_free_cmd(cmd, false); 1841 1842 return 0; 1843 } 1844 EXPORT_SYMBOL(iscsit_process_nop_out); 1845 1846 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1847 unsigned char *buf) 1848 { 1849 unsigned char *ping_data = NULL; 1850 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1851 struct kvec *iov = NULL; 1852 u32 payload_length = ntoh24(hdr->dlength); 1853 int ret; 1854 1855 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1856 if (ret < 0) 1857 return 0; 1858 /* 1859 * Handle NOP-OUT payload for traditional iSCSI sockets 1860 */ 1861 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1862 u32 checksum, data_crc, padding = 0; 1863 int niov = 0, rx_got, rx_size = payload_length; 1864 1865 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1866 if (!ping_data) { 1867 ret = -1; 1868 goto out; 1869 } 1870 1871 iov = &cmd->iov_misc[0]; 1872 iov[niov].iov_base = ping_data; 1873 iov[niov++].iov_len = payload_length; 1874 1875 padding = ((-payload_length) & 3); 1876 if (padding != 0) { 1877 pr_debug("Receiving %u additional bytes" 1878 " for padding.\n", padding); 1879 iov[niov].iov_base = &cmd->pad_bytes; 1880 iov[niov++].iov_len = padding; 1881 rx_size += padding; 1882 } 1883 if (conn->conn_ops->DataDigest) { 1884 iov[niov].iov_base = &checksum; 1885 iov[niov++].iov_len = ISCSI_CRC_LEN; 1886 rx_size += ISCSI_CRC_LEN; 1887 } 1888 1889 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); 1890 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1891 if (rx_got != rx_size) { 1892 ret = -1; 1893 goto out; 1894 } 1895 1896 if (conn->conn_ops->DataDigest) { 1897 data_crc = iscsit_crc_buf(ping_data, payload_length, 1898 padding, cmd->pad_bytes); 1899 if (checksum != data_crc) { 1900 pr_err("Ping data CRC32C DataDigest" 1901 " 0x%08x does not match computed 0x%08x\n", 1902 checksum, data_crc); 1903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1904 pr_err("Unable to recover from" 1905 " NOPOUT Ping DataCRC failure while in" 1906 " ERL=0.\n"); 1907 ret = -1; 1908 goto out; 1909 } else { 1910 /* 1911 * Silently drop this PDU and let the 1912 * initiator plug the CmdSN gap. 1913 */ 1914 pr_debug("Dropping NOPOUT" 1915 " Command CmdSN: 0x%08x due to" 1916 " DataCRC error.\n", hdr->cmdsn); 1917 ret = 0; 1918 goto out; 1919 } 1920 } else { 1921 pr_debug("Got CRC32C DataDigest" 1922 " 0x%08x for %u bytes of ping data.\n", 1923 checksum, payload_length); 1924 } 1925 } 1926 1927 ping_data[payload_length] = '\0'; 1928 /* 1929 * Attach ping data to struct iscsit_cmd->buf_ptr. 1930 */ 1931 cmd->buf_ptr = ping_data; 1932 cmd->buf_ptr_size = payload_length; 1933 1934 pr_debug("Got %u bytes of NOPOUT ping" 1935 " data.\n", payload_length); 1936 pr_debug("Ping Data: \"%s\"\n", ping_data); 1937 } 1938 1939 return iscsit_process_nop_out(conn, cmd, hdr); 1940 out: 1941 if (cmd) 1942 iscsit_free_cmd(cmd, false); 1943 1944 kfree(ping_data); 1945 return ret; 1946 } 1947 1948 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1949 { 1950 switch (iscsi_tmf) { 1951 case ISCSI_TM_FUNC_ABORT_TASK: 1952 return TMR_ABORT_TASK; 1953 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1954 return TMR_ABORT_TASK_SET; 1955 case ISCSI_TM_FUNC_CLEAR_ACA: 1956 return TMR_CLEAR_ACA; 1957 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1958 return TMR_CLEAR_TASK_SET; 1959 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1960 return TMR_LUN_RESET; 1961 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1962 return TMR_TARGET_WARM_RESET; 1963 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1964 return TMR_TARGET_COLD_RESET; 1965 default: 1966 return TMR_UNKNOWN; 1967 } 1968 } 1969 1970 int 1971 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1972 unsigned char *buf) 1973 { 1974 struct se_tmr_req *se_tmr; 1975 struct iscsi_tmr_req *tmr_req; 1976 struct iscsi_tm *hdr; 1977 int out_of_order_cmdsn = 0, ret; 1978 u8 function, tcm_function = TMR_UNKNOWN; 1979 1980 hdr = (struct iscsi_tm *) buf; 1981 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1982 function = hdr->flags; 1983 1984 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1985 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1986 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1987 hdr->rtt, hdr->refcmdsn, conn->cid); 1988 1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1990 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1991 hdr->rtt != RESERVED_ITT)) { 1992 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1993 hdr->rtt = RESERVED_ITT; 1994 } 1995 1996 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1997 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1998 pr_err("Task Management Request TASK_REASSIGN not" 1999 " issued as immediate command, bad iSCSI Initiator" 2000 "implementation\n"); 2001 return iscsit_add_reject_cmd(cmd, 2002 ISCSI_REASON_PROTOCOL_ERROR, buf); 2003 } 2004 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2005 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 2006 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 2007 2008 cmd->data_direction = DMA_NONE; 2009 cmd->tmr_req = kzalloc_obj(*cmd->tmr_req); 2010 if (!cmd->tmr_req) { 2011 return iscsit_add_reject_cmd(cmd, 2012 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2013 buf); 2014 } 2015 2016 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 2017 conn->sess->se_sess, 0, DMA_NONE, 2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2, 2019 scsilun_to_int(&hdr->lun), 2020 conn->cmd_cnt); 2021 2022 target_get_sess_cmd(&cmd->se_cmd, true); 2023 2024 /* 2025 * TASK_REASSIGN for ERL=2 / connection stays inside of 2026 * LIO-Target $FABRIC_MOD 2027 */ 2028 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2029 tcm_function = iscsit_convert_tmf(function); 2030 if (tcm_function == TMR_UNKNOWN) { 2031 pr_err("Unknown iSCSI TMR Function:" 2032 " 0x%02x\n", function); 2033 return iscsit_add_reject_cmd(cmd, 2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2035 } 2036 } 2037 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2038 GFP_KERNEL); 2039 if (ret < 0) 2040 return iscsit_add_reject_cmd(cmd, 2041 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2042 2043 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2044 2045 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2046 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2047 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2048 cmd->init_task_tag = hdr->itt; 2049 cmd->targ_xfer_tag = 0xFFFFFFFF; 2050 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2051 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2052 se_tmr = cmd->se_cmd.se_tmr_req; 2053 tmr_req = cmd->tmr_req; 2054 /* 2055 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2056 */ 2057 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2058 ret = transport_lookup_tmr_lun(&cmd->se_cmd); 2059 if (ret < 0) { 2060 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2061 goto attach; 2062 } 2063 } 2064 2065 switch (function) { 2066 case ISCSI_TM_FUNC_ABORT_TASK: 2067 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2068 if (se_tmr->response) 2069 goto attach; 2070 break; 2071 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2072 case ISCSI_TM_FUNC_CLEAR_ACA: 2073 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2074 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2075 break; 2076 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2077 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2079 goto attach; 2080 } 2081 break; 2082 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2083 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2084 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2085 goto attach; 2086 } 2087 break; 2088 case ISCSI_TM_FUNC_TASK_REASSIGN: 2089 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2090 /* 2091 * Perform sanity checks on the ExpDataSN only if the 2092 * TASK_REASSIGN was successful. 2093 */ 2094 if (se_tmr->response) 2095 break; 2096 2097 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2098 return iscsit_add_reject_cmd(cmd, 2099 ISCSI_REASON_BOOKMARK_INVALID, buf); 2100 break; 2101 default: 2102 pr_err("Unknown TMR function: 0x%02x, protocol" 2103 " error.\n", function); 2104 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2105 goto attach; 2106 } 2107 2108 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2109 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2110 se_tmr->call_transport = 1; 2111 attach: 2112 spin_lock_bh(&conn->cmd_lock); 2113 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2114 spin_unlock_bh(&conn->cmd_lock); 2115 2116 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2117 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2118 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2119 out_of_order_cmdsn = 1; 2120 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2121 target_put_sess_cmd(&cmd->se_cmd); 2122 return 0; 2123 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2124 return -1; 2125 } 2126 } 2127 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2128 2129 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2130 return 0; 2131 /* 2132 * Found the referenced task, send to transport for processing. 2133 */ 2134 if (se_tmr->call_transport) 2135 return transport_generic_handle_tmr(&cmd->se_cmd); 2136 2137 /* 2138 * Could not find the referenced LUN, task, or Task Management 2139 * command not authorized or supported. Change state and 2140 * let the tx_thread send the response. 2141 * 2142 * For connection recovery, this is also the default action for 2143 * TMR TASK_REASSIGN. 2144 */ 2145 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2146 target_put_sess_cmd(&cmd->se_cmd); 2147 return 0; 2148 } 2149 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2150 2151 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2152 int 2153 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2154 struct iscsi_text *hdr) 2155 { 2156 u32 payload_length = ntoh24(hdr->dlength); 2157 2158 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2159 pr_err("Unable to accept text parameter length: %u" 2160 "greater than MaxXmitDataSegmentLength %u.\n", 2161 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2162 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2163 (unsigned char *)hdr); 2164 } 2165 2166 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2167 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2168 pr_err("Multi sequence text commands currently not supported\n"); 2169 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2170 (unsigned char *)hdr); 2171 } 2172 2173 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2174 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2175 hdr->exp_statsn, payload_length); 2176 2177 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2178 cmd->i_state = ISTATE_SEND_TEXTRSP; 2179 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2180 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2181 cmd->targ_xfer_tag = 0xFFFFFFFF; 2182 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2183 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2184 cmd->data_direction = DMA_NONE; 2185 kfree(cmd->text_in_ptr); 2186 cmd->text_in_ptr = NULL; 2187 2188 return 0; 2189 } 2190 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2191 2192 int 2193 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2194 struct iscsi_text *hdr) 2195 { 2196 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2197 int cmdsn_ret; 2198 2199 if (!text_in) { 2200 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2201 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2202 pr_err("Unable to locate text_in buffer for sendtargets" 2203 " discovery\n"); 2204 goto reject; 2205 } 2206 goto empty_sendtargets; 2207 } 2208 if (strncmp("SendTargets=", text_in, 12) != 0) { 2209 pr_err("Received Text Data that is not" 2210 " SendTargets, cannot continue.\n"); 2211 goto reject; 2212 } 2213 /* '=' confirmed in strncmp */ 2214 text_ptr = strchr(text_in, '='); 2215 BUG_ON(!text_ptr); 2216 if (!strncmp("=All", text_ptr, 5)) { 2217 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2218 } else if (!strncmp("=iqn.", text_ptr, 5) || 2219 !strncmp("=eui.", text_ptr, 5)) { 2220 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2221 } else { 2222 pr_err("Unable to locate valid SendTargets%s value\n", 2223 text_ptr); 2224 goto reject; 2225 } 2226 2227 spin_lock_bh(&conn->cmd_lock); 2228 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2229 spin_unlock_bh(&conn->cmd_lock); 2230 2231 empty_sendtargets: 2232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2233 2234 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2236 (unsigned char *)hdr, hdr->cmdsn); 2237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2238 return -1; 2239 2240 return 0; 2241 } 2242 2243 return iscsit_execute_cmd(cmd, 0); 2244 2245 reject: 2246 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2247 (unsigned char *)hdr); 2248 } 2249 EXPORT_SYMBOL(iscsit_process_text_cmd); 2250 2251 static int 2252 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2253 unsigned char *buf) 2254 { 2255 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2256 char *text_in = NULL; 2257 u32 payload_length = ntoh24(hdr->dlength); 2258 int rx_size, rc; 2259 2260 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2261 if (rc < 0) 2262 return 0; 2263 2264 rx_size = payload_length; 2265 if (payload_length) { 2266 u32 checksum = 0, data_crc = 0; 2267 u32 padding = 0; 2268 int niov = 0, rx_got; 2269 struct kvec iov[2]; 2270 2271 rx_size = ALIGN(payload_length, 4); 2272 text_in = kzalloc(rx_size, GFP_KERNEL); 2273 if (!text_in) 2274 goto reject; 2275 2276 cmd->text_in_ptr = text_in; 2277 2278 memset(iov, 0, sizeof(iov)); 2279 iov[niov].iov_base = text_in; 2280 iov[niov++].iov_len = rx_size; 2281 2282 padding = rx_size - payload_length; 2283 if (padding) 2284 pr_debug("Receiving %u additional bytes" 2285 " for padding.\n", padding); 2286 if (conn->conn_ops->DataDigest) { 2287 iov[niov].iov_base = &checksum; 2288 iov[niov++].iov_len = ISCSI_CRC_LEN; 2289 rx_size += ISCSI_CRC_LEN; 2290 } 2291 2292 WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); 2293 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2294 if (rx_got != rx_size) 2295 goto reject; 2296 2297 if (conn->conn_ops->DataDigest) { 2298 data_crc = iscsit_crc_buf(text_in, 2299 ALIGN(payload_length, 4), 2300 0, NULL); 2301 if (checksum != data_crc) { 2302 pr_err("Text data CRC32C DataDigest" 2303 " 0x%08x does not match computed" 2304 " 0x%08x\n", checksum, data_crc); 2305 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2306 pr_err("Unable to recover from" 2307 " Text Data digest failure while in" 2308 " ERL=0.\n"); 2309 goto reject; 2310 } else { 2311 /* 2312 * Silently drop this PDU and let the 2313 * initiator plug the CmdSN gap. 2314 */ 2315 pr_debug("Dropping Text" 2316 " Command CmdSN: 0x%08x due to" 2317 " DataCRC error.\n", hdr->cmdsn); 2318 kfree(text_in); 2319 cmd->text_in_ptr = NULL; 2320 return 0; 2321 } 2322 } else { 2323 pr_debug("Got CRC32C DataDigest" 2324 " 0x%08x for %u bytes of text data.\n", 2325 checksum, payload_length); 2326 } 2327 } 2328 text_in[payload_length - 1] = '\0'; 2329 pr_debug("Successfully read %d bytes of text" 2330 " data.\n", payload_length); 2331 } 2332 2333 return iscsit_process_text_cmd(conn, cmd, hdr); 2334 2335 reject: 2336 kfree(cmd->text_in_ptr); 2337 cmd->text_in_ptr = NULL; 2338 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2339 } 2340 2341 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2342 { 2343 struct iscsit_conn *conn_p; 2344 struct iscsit_session *sess = conn->sess; 2345 2346 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2347 " for SID: %u.\n", conn->cid, conn->sess->sid); 2348 2349 atomic_set(&sess->session_logout, 1); 2350 atomic_set(&conn->conn_logout_remove, 1); 2351 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2352 2353 iscsit_inc_conn_usage_count(conn); 2354 iscsit_inc_session_usage_count(sess); 2355 2356 spin_lock_bh(&sess->conn_lock); 2357 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2358 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2359 continue; 2360 2361 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2362 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2363 } 2364 spin_unlock_bh(&sess->conn_lock); 2365 2366 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2367 2368 return 0; 2369 } 2370 2371 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2372 { 2373 struct iscsit_conn *l_conn; 2374 struct iscsit_session *sess = conn->sess; 2375 2376 pr_debug("Received logout request CLOSECONNECTION for CID:" 2377 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2378 2379 /* 2380 * A Logout Request with a CLOSECONNECTION reason code for a CID 2381 * can arrive on a connection with a differing CID. 2382 */ 2383 if (conn->cid == cmd->logout_cid) { 2384 spin_lock_bh(&conn->state_lock); 2385 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2386 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2387 2388 atomic_set(&conn->conn_logout_remove, 1); 2389 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2390 iscsit_inc_conn_usage_count(conn); 2391 2392 spin_unlock_bh(&conn->state_lock); 2393 } else { 2394 /* 2395 * Handle all different cid CLOSECONNECTION requests in 2396 * iscsit_logout_post_handler_diffcid() as to give enough 2397 * time for any non immediate command's CmdSN to be 2398 * acknowledged on the connection in question. 2399 * 2400 * Here we simply make sure the CID is still around. 2401 */ 2402 l_conn = iscsit_get_conn_from_cid(sess, 2403 cmd->logout_cid); 2404 if (!l_conn) { 2405 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2406 iscsit_add_cmd_to_response_queue(cmd, conn, 2407 cmd->i_state); 2408 return 0; 2409 } 2410 2411 iscsit_dec_conn_usage_count(l_conn); 2412 } 2413 2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2415 2416 return 0; 2417 } 2418 2419 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2420 { 2421 struct iscsit_session *sess = conn->sess; 2422 2423 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2424 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2425 2426 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2427 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2428 " while ERL!=2.\n"); 2429 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2431 return 0; 2432 } 2433 2434 if (conn->cid == cmd->logout_cid) { 2435 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2436 " with CID: %hu on CID: %hu, implementation error.\n", 2437 cmd->logout_cid, conn->cid); 2438 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2439 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2440 return 0; 2441 } 2442 2443 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2444 2445 return 0; 2446 } 2447 2448 int 2449 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2450 unsigned char *buf) 2451 { 2452 int cmdsn_ret, logout_remove = 0; 2453 u8 reason_code = 0; 2454 struct iscsi_logout *hdr; 2455 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2456 2457 hdr = (struct iscsi_logout *) buf; 2458 reason_code = (hdr->flags & 0x7f); 2459 2460 if (tiqn) { 2461 spin_lock(&tiqn->logout_stats.lock); 2462 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2463 tiqn->logout_stats.normal_logouts++; 2464 else 2465 tiqn->logout_stats.abnormal_logouts++; 2466 spin_unlock(&tiqn->logout_stats.lock); 2467 } 2468 2469 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2470 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2471 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2472 hdr->cid, conn->cid); 2473 2474 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2475 pr_err("Received logout request on connection that" 2476 " is not in logged in state, ignoring request.\n"); 2477 iscsit_free_cmd(cmd, false); 2478 return 0; 2479 } 2480 2481 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2482 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2483 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2484 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2485 cmd->targ_xfer_tag = 0xFFFFFFFF; 2486 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2487 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2488 cmd->logout_cid = be16_to_cpu(hdr->cid); 2489 cmd->logout_reason = reason_code; 2490 cmd->data_direction = DMA_NONE; 2491 2492 /* 2493 * We need to sleep in these cases (by returning 1) until the Logout 2494 * Response gets sent in the tx thread. 2495 */ 2496 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2497 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2498 be16_to_cpu(hdr->cid) == conn->cid)) 2499 logout_remove = 1; 2500 2501 spin_lock_bh(&conn->cmd_lock); 2502 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2503 spin_unlock_bh(&conn->cmd_lock); 2504 2505 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2506 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2507 2508 /* 2509 * Immediate commands are executed, well, immediately. 2510 * Non-Immediate Logout Commands are executed in CmdSN order. 2511 */ 2512 if (cmd->immediate_cmd) { 2513 int ret = iscsit_execute_cmd(cmd, 0); 2514 2515 if (ret < 0) 2516 return ret; 2517 } else { 2518 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2519 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2520 logout_remove = 0; 2521 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2522 return -1; 2523 } 2524 2525 return logout_remove; 2526 } 2527 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2528 2529 int iscsit_handle_snack( 2530 struct iscsit_conn *conn, 2531 unsigned char *buf) 2532 { 2533 struct iscsi_snack *hdr; 2534 2535 hdr = (struct iscsi_snack *) buf; 2536 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2537 2538 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2539 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2540 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2541 hdr->begrun, hdr->runlength, conn->cid); 2542 2543 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2544 pr_err("Initiator sent SNACK request while in" 2545 " ErrorRecoveryLevel=0.\n"); 2546 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2547 buf); 2548 } 2549 /* 2550 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2551 * call from inside iscsi_send_recovery_datain_or_r2t(). 2552 */ 2553 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2554 case 0: 2555 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2556 hdr->itt, 2557 be32_to_cpu(hdr->ttt), 2558 be32_to_cpu(hdr->begrun), 2559 be32_to_cpu(hdr->runlength)); 2560 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2561 return iscsit_handle_status_snack(conn, hdr->itt, 2562 be32_to_cpu(hdr->ttt), 2563 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2564 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2565 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2566 be32_to_cpu(hdr->begrun), 2567 be32_to_cpu(hdr->runlength)); 2568 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2569 /* FIXME: Support R-Data SNACK */ 2570 pr_err("R-Data SNACK Not Supported.\n"); 2571 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2572 buf); 2573 default: 2574 pr_err("Unknown SNACK type 0x%02x, protocol" 2575 " error.\n", hdr->flags & 0x0f); 2576 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2577 buf); 2578 } 2579 2580 return 0; 2581 } 2582 EXPORT_SYMBOL(iscsit_handle_snack); 2583 2584 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn) 2585 { 2586 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2587 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2588 wait_for_completion_interruptible_timeout( 2589 &conn->rx_half_close_comp, 2590 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2591 } 2592 } 2593 2594 static int iscsit_handle_immediate_data( 2595 struct iscsit_cmd *cmd, 2596 struct iscsi_scsi_req *hdr, 2597 u32 length) 2598 { 2599 int iov_ret, rx_got = 0, rx_size = 0; 2600 u32 checksum, iov_count = 0, padding = 0; 2601 struct iscsit_conn *conn = cmd->conn; 2602 struct kvec *iov; 2603 void *overflow_buf = NULL; 2604 2605 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2606 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2607 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2608 cmd->orig_iov_data_count - 2, 2609 cmd->write_data_done, rx_size); 2610 if (iov_ret < 0) 2611 return IMMEDIATE_DATA_CANNOT_RECOVER; 2612 2613 iov_count = iov_ret; 2614 iov = &cmd->iov_data[0]; 2615 if (rx_size < length) { 2616 /* 2617 * Special case: length of immediate data exceeds the data 2618 * buffer size derived from the CDB. 2619 */ 2620 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2621 if (!overflow_buf) { 2622 iscsit_unmap_iovec(cmd); 2623 return IMMEDIATE_DATA_CANNOT_RECOVER; 2624 } 2625 cmd->overflow_buf = overflow_buf; 2626 iov[iov_count].iov_base = overflow_buf; 2627 iov[iov_count].iov_len = length - rx_size; 2628 iov_count++; 2629 rx_size = length; 2630 } 2631 2632 padding = ((-length) & 3); 2633 if (padding != 0) { 2634 iov[iov_count].iov_base = cmd->pad_bytes; 2635 iov[iov_count++].iov_len = padding; 2636 rx_size += padding; 2637 } 2638 2639 if (conn->conn_ops->DataDigest) { 2640 iov[iov_count].iov_base = &checksum; 2641 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2642 rx_size += ISCSI_CRC_LEN; 2643 } 2644 2645 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2646 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2647 2648 iscsit_unmap_iovec(cmd); 2649 2650 if (rx_got != rx_size) { 2651 iscsit_rx_thread_wait_for_tcp(conn); 2652 return IMMEDIATE_DATA_CANNOT_RECOVER; 2653 } 2654 2655 if (conn->conn_ops->DataDigest) { 2656 u32 data_crc; 2657 2658 data_crc = iscsit_crc_sglist(cmd, length, padding, 2659 cmd->pad_bytes); 2660 if (checksum != data_crc) { 2661 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2662 " does not match computed 0x%08x\n", checksum, 2663 data_crc); 2664 2665 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2666 pr_err("Unable to recover from" 2667 " Immediate Data digest failure while" 2668 " in ERL=0.\n"); 2669 iscsit_reject_cmd(cmd, 2670 ISCSI_REASON_DATA_DIGEST_ERROR, 2671 (unsigned char *)hdr); 2672 return IMMEDIATE_DATA_CANNOT_RECOVER; 2673 } else { 2674 iscsit_reject_cmd(cmd, 2675 ISCSI_REASON_DATA_DIGEST_ERROR, 2676 (unsigned char *)hdr); 2677 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2678 } 2679 } else { 2680 pr_debug("Got CRC32C DataDigest 0x%08x for" 2681 " %u bytes of Immediate Data\n", checksum, 2682 length); 2683 } 2684 } 2685 2686 cmd->write_data_done += length; 2687 2688 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2689 spin_lock_bh(&cmd->istate_lock); 2690 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2691 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2692 spin_unlock_bh(&cmd->istate_lock); 2693 } 2694 2695 return IMMEDIATE_DATA_NORMAL_OPERATION; 2696 } 2697 2698 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2699 with active network interface */ 2700 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn) 2701 { 2702 struct iscsit_cmd *cmd; 2703 struct iscsit_conn *conn_p; 2704 bool found = false; 2705 2706 lockdep_assert_held(&conn->sess->conn_lock); 2707 2708 /* 2709 * Only send a Asynchronous Message on connections whos network 2710 * interface is still functional. 2711 */ 2712 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2713 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2714 iscsit_inc_conn_usage_count(conn_p); 2715 found = true; 2716 break; 2717 } 2718 } 2719 2720 if (!found) 2721 return; 2722 2723 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2724 if (!cmd) { 2725 iscsit_dec_conn_usage_count(conn_p); 2726 return; 2727 } 2728 2729 cmd->logout_cid = conn->cid; 2730 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2731 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2732 2733 spin_lock_bh(&conn_p->cmd_lock); 2734 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2735 spin_unlock_bh(&conn_p->cmd_lock); 2736 2737 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2738 iscsit_dec_conn_usage_count(conn_p); 2739 } 2740 2741 static int iscsit_send_conn_drop_async_message( 2742 struct iscsit_cmd *cmd, 2743 struct iscsit_conn *conn) 2744 { 2745 struct iscsi_async *hdr; 2746 2747 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2748 2749 hdr = (struct iscsi_async *) cmd->pdu; 2750 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2751 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2752 cmd->init_task_tag = RESERVED_ITT; 2753 cmd->targ_xfer_tag = 0xFFFFFFFF; 2754 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2755 cmd->stat_sn = conn->stat_sn++; 2756 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2757 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2758 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2759 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2760 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2761 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2762 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2763 2764 pr_debug("Sending Connection Dropped Async Message StatSN:" 2765 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2766 cmd->logout_cid, conn->cid); 2767 2768 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2769 } 2770 2771 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn) 2772 { 2773 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2774 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2775 wait_for_completion_interruptible_timeout( 2776 &conn->tx_half_close_comp, 2777 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2778 } 2779 } 2780 2781 void 2782 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2783 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2784 bool set_statsn) 2785 { 2786 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2787 hdr->flags = datain->flags; 2788 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2789 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2790 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2791 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2792 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2793 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2794 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2795 } 2796 } 2797 hton24(hdr->dlength, datain->length); 2798 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2799 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2800 (struct scsi_lun *)&hdr->lun); 2801 else 2802 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2803 2804 hdr->itt = cmd->init_task_tag; 2805 2806 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2807 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2808 else 2809 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2810 if (set_statsn) 2811 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2812 else 2813 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2814 2815 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2816 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2817 hdr->datasn = cpu_to_be32(datain->data_sn); 2818 hdr->offset = cpu_to_be32(datain->offset); 2819 2820 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2821 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2822 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2823 ntohl(hdr->offset), datain->length, conn->cid); 2824 } 2825 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2826 2827 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2828 { 2829 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2830 struct iscsi_datain datain; 2831 struct iscsi_datain_req *dr; 2832 int eodr = 0, ret; 2833 bool set_statsn = false; 2834 2835 memset(&datain, 0, sizeof(struct iscsi_datain)); 2836 dr = iscsit_get_datain_values(cmd, &datain); 2837 if (!dr) { 2838 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2839 cmd->init_task_tag); 2840 return -1; 2841 } 2842 /* 2843 * Be paranoid and double check the logic for now. 2844 */ 2845 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2846 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2847 " datain.length: %u exceeds cmd->data_length: %u\n", 2848 cmd->init_task_tag, datain.offset, datain.length, 2849 cmd->se_cmd.data_length); 2850 return -1; 2851 } 2852 2853 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2854 /* 2855 * Special case for successfully execution w/ both DATAIN 2856 * and Sense Data. 2857 */ 2858 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2859 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2860 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2861 else { 2862 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2863 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2864 iscsit_increment_maxcmdsn(cmd, conn->sess); 2865 cmd->stat_sn = conn->stat_sn++; 2866 set_statsn = true; 2867 } else if (dr->dr_complete == 2868 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2869 set_statsn = true; 2870 } 2871 2872 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2873 2874 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2875 if (ret < 0) 2876 return ret; 2877 2878 if (dr->dr_complete) { 2879 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2880 2 : 1; 2881 iscsit_free_datain_req(cmd, dr); 2882 } 2883 2884 return eodr; 2885 } 2886 2887 int 2888 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2889 struct iscsi_logout_rsp *hdr) 2890 { 2891 struct iscsit_conn *logout_conn = NULL; 2892 struct iscsi_conn_recovery *cr = NULL; 2893 struct iscsit_session *sess = conn->sess; 2894 /* 2895 * The actual shutting down of Sessions and/or Connections 2896 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2897 * is done in scsi_logout_post_handler(). 2898 */ 2899 switch (cmd->logout_reason) { 2900 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2901 pr_debug("iSCSI session logout successful, setting" 2902 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2903 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2904 break; 2905 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2906 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2907 break; 2908 /* 2909 * For CLOSECONNECTION logout requests carrying 2910 * a matching logout CID -> local CID, the reference 2911 * for the local CID will have been incremented in 2912 * iscsi_logout_closeconnection(). 2913 * 2914 * For CLOSECONNECTION logout requests carrying 2915 * a different CID than the connection it arrived 2916 * on, the connection responding to cmd->logout_cid 2917 * is stopped in iscsit_logout_post_handler_diffcid(). 2918 */ 2919 2920 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2921 " successful.\n", cmd->logout_cid, conn->cid); 2922 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2923 break; 2924 case ISCSI_LOGOUT_REASON_RECOVERY: 2925 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2926 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2927 break; 2928 /* 2929 * If the connection is still active from our point of view 2930 * force connection recovery to occur. 2931 */ 2932 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2933 cmd->logout_cid); 2934 if (logout_conn) { 2935 iscsit_connection_reinstatement_rcfr(logout_conn); 2936 iscsit_dec_conn_usage_count(logout_conn); 2937 } 2938 2939 cr = iscsit_get_inactive_connection_recovery_entry( 2940 conn->sess, cmd->logout_cid); 2941 if (!cr) { 2942 pr_err("Unable to locate CID: %hu for" 2943 " REMOVECONNFORRECOVERY Logout Request.\n", 2944 cmd->logout_cid); 2945 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2946 break; 2947 } 2948 2949 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2950 2951 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2952 " for recovery for CID: %hu on CID: %hu successful.\n", 2953 cmd->logout_cid, conn->cid); 2954 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2955 break; 2956 default: 2957 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2958 cmd->logout_reason); 2959 return -1; 2960 } 2961 2962 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2963 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2964 hdr->response = cmd->logout_response; 2965 hdr->itt = cmd->init_task_tag; 2966 cmd->stat_sn = conn->stat_sn++; 2967 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2968 2969 iscsit_increment_maxcmdsn(cmd, conn->sess); 2970 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2971 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2972 2973 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2974 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2975 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2976 cmd->logout_cid, conn->cid); 2977 2978 return 0; 2979 } 2980 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2981 2982 static int 2983 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2984 { 2985 int rc; 2986 2987 rc = iscsit_build_logout_rsp(cmd, conn, 2988 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2989 if (rc < 0) 2990 return rc; 2991 2992 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2993 } 2994 2995 void 2996 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2997 struct iscsi_nopin *hdr, bool nopout_response) 2998 { 2999 hdr->opcode = ISCSI_OP_NOOP_IN; 3000 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3001 hton24(hdr->dlength, cmd->buf_ptr_size); 3002 if (nopout_response) 3003 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 3004 hdr->itt = cmd->init_task_tag; 3005 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3006 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 3007 conn->stat_sn; 3008 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3009 3010 if (nopout_response) 3011 iscsit_increment_maxcmdsn(cmd, conn->sess); 3012 3013 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3014 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3015 3016 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3017 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3018 "Solicited" : "Unsolicited", cmd->init_task_tag, 3019 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3020 } 3021 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3022 3023 /* 3024 * Unsolicited NOPIN, either requesting a response or not. 3025 */ 3026 static int iscsit_send_unsolicited_nopin( 3027 struct iscsit_cmd *cmd, 3028 struct iscsit_conn *conn, 3029 int want_response) 3030 { 3031 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3032 int ret; 3033 3034 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3035 3036 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3037 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3038 3039 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3040 if (ret < 0) 3041 return ret; 3042 3043 spin_lock_bh(&cmd->istate_lock); 3044 cmd->i_state = want_response ? 3045 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3046 spin_unlock_bh(&cmd->istate_lock); 3047 3048 return 0; 3049 } 3050 3051 static int 3052 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3053 { 3054 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3055 3056 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3057 3058 /* 3059 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr. 3060 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size. 3061 */ 3062 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3063 3064 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3065 cmd->buf_ptr, 3066 cmd->buf_ptr_size); 3067 } 3068 3069 static int iscsit_send_r2t( 3070 struct iscsit_cmd *cmd, 3071 struct iscsit_conn *conn) 3072 { 3073 struct iscsi_r2t *r2t; 3074 struct iscsi_r2t_rsp *hdr; 3075 int ret; 3076 3077 r2t = iscsit_get_r2t_from_list(cmd); 3078 if (!r2t) 3079 return -1; 3080 3081 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3082 memset(hdr, 0, ISCSI_HDR_LEN); 3083 hdr->opcode = ISCSI_OP_R2T; 3084 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3085 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3086 (struct scsi_lun *)&hdr->lun); 3087 hdr->itt = cmd->init_task_tag; 3088 if (conn->conn_transport->iscsit_get_r2t_ttt) 3089 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3090 else 3091 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3092 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3093 hdr->statsn = cpu_to_be32(conn->stat_sn); 3094 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3095 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3096 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3097 hdr->data_offset = cpu_to_be32(r2t->offset); 3098 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3099 3100 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3101 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3102 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3103 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3104 r2t->offset, r2t->xfer_len, conn->cid); 3105 3106 spin_lock_bh(&cmd->r2t_lock); 3107 r2t->sent_r2t = 1; 3108 spin_unlock_bh(&cmd->r2t_lock); 3109 3110 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3111 if (ret < 0) { 3112 return ret; 3113 } 3114 3115 spin_lock_bh(&cmd->dataout_timeout_lock); 3116 iscsit_start_dataout_timer(cmd, conn); 3117 spin_unlock_bh(&cmd->dataout_timeout_lock); 3118 3119 return 0; 3120 } 3121 3122 /* 3123 * @recovery: If called from iscsi_task_reassign_complete_write() for 3124 * connection recovery. 3125 */ 3126 int iscsit_build_r2ts_for_cmd( 3127 struct iscsit_conn *conn, 3128 struct iscsit_cmd *cmd, 3129 bool recovery) 3130 { 3131 int first_r2t = 1; 3132 u32 offset = 0, xfer_len = 0; 3133 3134 spin_lock_bh(&cmd->r2t_lock); 3135 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3136 spin_unlock_bh(&cmd->r2t_lock); 3137 return 0; 3138 } 3139 3140 if (conn->sess->sess_ops->DataSequenceInOrder && 3141 !recovery) 3142 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3143 3144 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3145 if (conn->sess->sess_ops->DataSequenceInOrder) { 3146 offset = cmd->r2t_offset; 3147 3148 if (first_r2t && recovery) { 3149 int new_data_end = offset + 3150 conn->sess->sess_ops->MaxBurstLength - 3151 cmd->next_burst_len; 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 = 3157 conn->sess->sess_ops->MaxBurstLength - 3158 cmd->next_burst_len; 3159 } else { 3160 int new_data_end = offset + 3161 conn->sess->sess_ops->MaxBurstLength; 3162 3163 if (new_data_end > cmd->se_cmd.data_length) 3164 xfer_len = cmd->se_cmd.data_length - offset; 3165 else 3166 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3167 } 3168 3169 if ((s32)xfer_len < 0) { 3170 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3171 break; 3172 } 3173 3174 cmd->r2t_offset += xfer_len; 3175 3176 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3177 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3178 } else { 3179 struct iscsi_seq *seq; 3180 3181 seq = iscsit_get_seq_holder_for_r2t(cmd); 3182 if (!seq) { 3183 spin_unlock_bh(&cmd->r2t_lock); 3184 return -1; 3185 } 3186 3187 offset = seq->offset; 3188 xfer_len = seq->xfer_len; 3189 3190 if (cmd->seq_send_order == cmd->seq_count) 3191 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3192 } 3193 cmd->outstanding_r2ts++; 3194 first_r2t = 0; 3195 3196 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3197 spin_unlock_bh(&cmd->r2t_lock); 3198 return -1; 3199 } 3200 3201 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3202 break; 3203 } 3204 spin_unlock_bh(&cmd->r2t_lock); 3205 3206 return 0; 3207 } 3208 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3209 3210 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3211 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3212 { 3213 if (inc_stat_sn) 3214 cmd->stat_sn = conn->stat_sn++; 3215 3216 atomic_long_inc(&conn->sess->rsp_pdus); 3217 3218 memset(hdr, 0, ISCSI_HDR_LEN); 3219 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3220 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3221 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3222 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3223 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3224 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3225 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3226 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3227 } 3228 hdr->response = cmd->iscsi_response; 3229 hdr->cmd_status = cmd->se_cmd.scsi_status; 3230 hdr->itt = cmd->init_task_tag; 3231 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3232 3233 iscsit_increment_maxcmdsn(cmd, conn->sess); 3234 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3235 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3236 3237 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3238 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3239 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3240 cmd->se_cmd.scsi_status, conn->cid); 3241 } 3242 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3243 3244 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3245 { 3246 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3247 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3248 void *data_buf = NULL; 3249 u32 padding = 0, data_buf_len = 0; 3250 3251 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3252 3253 /* 3254 * Attach SENSE DATA payload to iSCSI Response PDU 3255 */ 3256 if (cmd->se_cmd.sense_buffer && 3257 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3258 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3259 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3260 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3261 3262 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3263 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3264 data_buf = cmd->sense_buffer; 3265 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3266 3267 if (padding) { 3268 memset(cmd->sense_buffer + 3269 cmd->se_cmd.scsi_sense_length, 0, padding); 3270 pr_debug("Adding %u bytes of padding to" 3271 " SENSE.\n", padding); 3272 } 3273 3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3275 " Response PDU\n", 3276 cmd->se_cmd.scsi_sense_length); 3277 } 3278 3279 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3280 data_buf_len); 3281 } 3282 3283 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3284 { 3285 switch (se_tmr->response) { 3286 case TMR_FUNCTION_COMPLETE: 3287 return ISCSI_TMF_RSP_COMPLETE; 3288 case TMR_TASK_DOES_NOT_EXIST: 3289 return ISCSI_TMF_RSP_NO_TASK; 3290 case TMR_LUN_DOES_NOT_EXIST: 3291 return ISCSI_TMF_RSP_NO_LUN; 3292 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3293 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3294 case TMR_FUNCTION_REJECTED: 3295 default: 3296 return ISCSI_TMF_RSP_REJECTED; 3297 } 3298 } 3299 3300 void 3301 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3302 struct iscsi_tm_rsp *hdr) 3303 { 3304 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3305 3306 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3307 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3308 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3309 hdr->itt = cmd->init_task_tag; 3310 cmd->stat_sn = conn->stat_sn++; 3311 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3312 3313 iscsit_increment_maxcmdsn(cmd, conn->sess); 3314 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3315 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3316 3317 pr_debug("Built Task Management Response ITT: 0x%08x," 3318 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3319 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3320 } 3321 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3322 3323 static int 3324 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3325 { 3326 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3327 3328 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3329 3330 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3331 } 3332 3333 #define SENDTARGETS_BUF_LIMIT 32768U 3334 3335 static int 3336 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd, 3337 enum iscsit_transport_type network_transport, 3338 int skip_bytes, bool *completed) 3339 { 3340 char *payload = NULL; 3341 struct iscsit_conn *conn = cmd->conn; 3342 struct iscsi_portal_group *tpg; 3343 struct iscsi_tiqn *tiqn; 3344 struct iscsi_tpg_np *tpg_np; 3345 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3346 int target_name_printed; 3347 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3348 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3349 bool active; 3350 3351 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3352 SENDTARGETS_BUF_LIMIT); 3353 3354 payload = kzalloc(buffer_len, GFP_KERNEL); 3355 if (!payload) 3356 return -ENOMEM; 3357 3358 /* 3359 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3360 * explicit case.. 3361 */ 3362 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3363 text_ptr = strchr(text_in, '='); 3364 if (!text_ptr) { 3365 pr_err("Unable to locate '=' string in text_in:" 3366 " %s\n", text_in); 3367 kfree(payload); 3368 return -EINVAL; 3369 } 3370 /* 3371 * Skip over '=' character.. 3372 */ 3373 text_ptr += 1; 3374 } 3375 3376 spin_lock(&tiqn_lock); 3377 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3378 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3379 strcmp(tiqn->tiqn, text_ptr)) { 3380 continue; 3381 } 3382 3383 target_name_printed = 0; 3384 3385 spin_lock(&tiqn->tiqn_tpg_lock); 3386 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3387 3388 /* If demo_mode_discovery=0 and generate_node_acls=0 3389 * (demo mode dislabed) do not return 3390 * TargetName+TargetAddress unless a NodeACL exists. 3391 */ 3392 3393 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3394 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3395 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3396 cmd->conn->sess->sess_ops->InitiatorName))) { 3397 continue; 3398 } 3399 3400 spin_lock(&tpg->tpg_state_lock); 3401 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3402 spin_unlock(&tpg->tpg_state_lock); 3403 3404 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3405 continue; 3406 3407 spin_lock(&tpg->tpg_np_lock); 3408 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3409 tpg_np_list) { 3410 struct iscsi_np *np = tpg_np->tpg_np; 3411 struct sockaddr_storage *sockaddr; 3412 3413 if (np->np_network_transport != network_transport) 3414 continue; 3415 3416 if (!target_name_printed) { 3417 len = sprintf(buf, "TargetName=%s", 3418 tiqn->tiqn); 3419 len += 1; 3420 3421 if ((len + payload_len) > buffer_len) { 3422 spin_unlock(&tpg->tpg_np_lock); 3423 spin_unlock(&tiqn->tiqn_tpg_lock); 3424 end_of_buf = 1; 3425 goto eob; 3426 } 3427 3428 if (skip_bytes && len <= skip_bytes) { 3429 skip_bytes -= len; 3430 } else { 3431 memcpy(payload + payload_len, buf, len); 3432 payload_len += len; 3433 target_name_printed = 1; 3434 if (len > skip_bytes) 3435 skip_bytes = 0; 3436 } 3437 } 3438 3439 if (inet_addr_is_any(&np->np_sockaddr)) 3440 sockaddr = &conn->local_sockaddr; 3441 else 3442 sockaddr = &np->np_sockaddr; 3443 3444 len = sprintf(buf, "TargetAddress=" 3445 "%pISpc,%hu", 3446 sockaddr, 3447 tpg->tpgt); 3448 len += 1; 3449 3450 if ((len + payload_len) > buffer_len) { 3451 spin_unlock(&tpg->tpg_np_lock); 3452 spin_unlock(&tiqn->tiqn_tpg_lock); 3453 end_of_buf = 1; 3454 goto eob; 3455 } 3456 3457 if (skip_bytes && len <= skip_bytes) { 3458 skip_bytes -= len; 3459 } else { 3460 memcpy(payload + payload_len, buf, len); 3461 payload_len += len; 3462 if (len > skip_bytes) 3463 skip_bytes = 0; 3464 } 3465 } 3466 spin_unlock(&tpg->tpg_np_lock); 3467 } 3468 spin_unlock(&tiqn->tiqn_tpg_lock); 3469 eob: 3470 if (end_of_buf) { 3471 *completed = false; 3472 break; 3473 } 3474 3475 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3476 break; 3477 } 3478 spin_unlock(&tiqn_lock); 3479 3480 cmd->buf_ptr = payload; 3481 3482 return payload_len; 3483 } 3484 3485 int 3486 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3487 struct iscsi_text_rsp *hdr, 3488 enum iscsit_transport_type network_transport) 3489 { 3490 int text_length, padding; 3491 bool completed = true; 3492 3493 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3494 cmd->read_data_done, 3495 &completed); 3496 if (text_length < 0) 3497 return text_length; 3498 3499 if (completed) { 3500 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3501 } else { 3502 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3503 cmd->read_data_done += text_length; 3504 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3505 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3506 } 3507 hdr->opcode = ISCSI_OP_TEXT_RSP; 3508 padding = ((-text_length) & 3); 3509 hton24(hdr->dlength, text_length); 3510 hdr->itt = cmd->init_task_tag; 3511 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3512 cmd->stat_sn = conn->stat_sn++; 3513 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3514 3515 iscsit_increment_maxcmdsn(cmd, conn->sess); 3516 /* 3517 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3518 * correctly increment MaxCmdSN for each response answering a 3519 * non immediate text request with a valid CmdSN. 3520 */ 3521 cmd->maxcmdsn_inc = 0; 3522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3523 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3524 3525 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3526 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3527 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3528 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3529 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3530 3531 return text_length + padding; 3532 } 3533 EXPORT_SYMBOL(iscsit_build_text_rsp); 3534 3535 static int iscsit_send_text_rsp( 3536 struct iscsit_cmd *cmd, 3537 struct iscsit_conn *conn) 3538 { 3539 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3540 int text_length; 3541 3542 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3543 conn->conn_transport->transport_type); 3544 if (text_length < 0) 3545 return text_length; 3546 3547 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3548 cmd->buf_ptr, 3549 text_length); 3550 } 3551 3552 void 3553 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3554 struct iscsi_reject *hdr) 3555 { 3556 hdr->opcode = ISCSI_OP_REJECT; 3557 hdr->reason = cmd->reject_reason; 3558 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3559 hton24(hdr->dlength, ISCSI_HDR_LEN); 3560 hdr->ffffffff = cpu_to_be32(0xffffffff); 3561 cmd->stat_sn = conn->stat_sn++; 3562 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3563 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3564 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3565 3566 } 3567 EXPORT_SYMBOL(iscsit_build_reject); 3568 3569 static int iscsit_send_reject( 3570 struct iscsit_cmd *cmd, 3571 struct iscsit_conn *conn) 3572 { 3573 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3574 3575 iscsit_build_reject(cmd, conn, hdr); 3576 3577 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3578 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3579 3580 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3581 cmd->buf_ptr, 3582 ISCSI_HDR_LEN); 3583 } 3584 3585 void iscsit_thread_get_cpumask(struct iscsit_conn *conn) 3586 { 3587 int ord, cpu; 3588 cpumask_var_t conn_allowed_cpumask; 3589 3590 /* 3591 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3592 * within iscsit_start_kthreads() 3593 * 3594 * Here we use bitmap_id to determine which CPU that this 3595 * iSCSI connection's RX/TX threads will be scheduled to 3596 * execute upon. 3597 */ 3598 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) { 3599 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3600 for_each_online_cpu(cpu) { 3601 if (ord-- == 0) { 3602 cpumask_set_cpu(cpu, conn->conn_cpumask); 3603 return; 3604 } 3605 } 3606 } else { 3607 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask, 3608 cpu_online_mask); 3609 3610 cpumask_clear(conn->conn_cpumask); 3611 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask); 3612 for_each_cpu(cpu, conn_allowed_cpumask) { 3613 if (ord-- == 0) { 3614 cpumask_set_cpu(cpu, conn->conn_cpumask); 3615 free_cpumask_var(conn_allowed_cpumask); 3616 return; 3617 } 3618 } 3619 free_cpumask_var(conn_allowed_cpumask); 3620 } 3621 /* 3622 * This should never be reached.. 3623 */ 3624 dump_stack(); 3625 cpumask_setall(conn->conn_cpumask); 3626 } 3627 3628 static void iscsit_thread_reschedule(struct iscsit_conn *conn) 3629 { 3630 /* 3631 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI 3632 * connection's RX/TX threads update conn->allowed_cpumask. 3633 */ 3634 if (!cpumask_equal(iscsit_global->allowed_cpumask, 3635 conn->allowed_cpumask)) { 3636 iscsit_thread_get_cpumask(conn); 3637 conn->conn_tx_reset_cpumask = 1; 3638 conn->conn_rx_reset_cpumask = 1; 3639 cpumask_copy(conn->allowed_cpumask, 3640 iscsit_global->allowed_cpumask); 3641 } 3642 } 3643 3644 void iscsit_thread_check_cpumask( 3645 struct iscsit_conn *conn, 3646 struct task_struct *p, 3647 int mode) 3648 { 3649 /* 3650 * The TX and RX threads maybe call iscsit_thread_check_cpumask() 3651 * at the same time. The RX thread might be faster and return from 3652 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0. 3653 * Then the TX thread sets it back to 1. 3654 * The next time the RX thread loops, it sees conn_rx_reset_cpumask 3655 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0. 3656 */ 3657 iscsit_thread_reschedule(conn); 3658 3659 /* 3660 * mode == 1 signals iscsi_target_tx_thread() usage. 3661 * mode == 0 signals iscsi_target_rx_thread() usage. 3662 */ 3663 if (mode == 1) { 3664 if (!conn->conn_tx_reset_cpumask) 3665 return; 3666 } else { 3667 if (!conn->conn_rx_reset_cpumask) 3668 return; 3669 } 3670 3671 /* 3672 * Update the CPU mask for this single kthread so that 3673 * both TX and RX kthreads are scheduled to run on the 3674 * same CPU. 3675 */ 3676 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3677 if (mode == 1) 3678 conn->conn_tx_reset_cpumask = 0; 3679 else 3680 conn->conn_rx_reset_cpumask = 0; 3681 } 3682 EXPORT_SYMBOL(iscsit_thread_check_cpumask); 3683 3684 int 3685 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3686 { 3687 int ret; 3688 3689 switch (state) { 3690 case ISTATE_SEND_R2T: 3691 ret = iscsit_send_r2t(cmd, conn); 3692 if (ret < 0) 3693 goto err; 3694 break; 3695 case ISTATE_REMOVE: 3696 spin_lock_bh(&conn->cmd_lock); 3697 list_del_init(&cmd->i_conn_node); 3698 spin_unlock_bh(&conn->cmd_lock); 3699 3700 iscsit_free_cmd(cmd, false); 3701 break; 3702 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3703 iscsit_mod_nopin_response_timer(conn); 3704 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3705 if (ret < 0) 3706 goto err; 3707 break; 3708 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3709 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3710 if (ret < 0) 3711 goto err; 3712 break; 3713 default: 3714 pr_err("Unknown Opcode: 0x%02x ITT:" 3715 " 0x%08x, i_state: %d on CID: %hu\n", 3716 cmd->iscsi_opcode, cmd->init_task_tag, state, 3717 conn->cid); 3718 goto err; 3719 } 3720 3721 return 0; 3722 3723 err: 3724 return -1; 3725 } 3726 EXPORT_SYMBOL(iscsit_immediate_queue); 3727 3728 static int 3729 iscsit_handle_immediate_queue(struct iscsit_conn *conn) 3730 { 3731 struct iscsit_transport *t = conn->conn_transport; 3732 struct iscsi_queue_req *qr; 3733 struct iscsit_cmd *cmd; 3734 u8 state; 3735 int ret; 3736 3737 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3738 atomic_set(&conn->check_immediate_queue, 0); 3739 cmd = qr->cmd; 3740 state = qr->state; 3741 kmem_cache_free(lio_qr_cache, qr); 3742 3743 ret = t->iscsit_immediate_queue(conn, cmd, state); 3744 if (ret < 0) 3745 return ret; 3746 } 3747 3748 return 0; 3749 } 3750 3751 int 3752 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3753 { 3754 int ret; 3755 3756 check_rsp_state: 3757 switch (state) { 3758 case ISTATE_SEND_DATAIN: 3759 ret = iscsit_send_datain(cmd, conn); 3760 if (ret < 0) 3761 goto err; 3762 else if (!ret) 3763 /* more drs */ 3764 goto check_rsp_state; 3765 else if (ret == 1) { 3766 /* all done */ 3767 spin_lock_bh(&cmd->istate_lock); 3768 cmd->i_state = ISTATE_SENT_STATUS; 3769 spin_unlock_bh(&cmd->istate_lock); 3770 3771 if (atomic_read(&conn->check_immediate_queue)) 3772 return 1; 3773 3774 return 0; 3775 } else if (ret == 2) { 3776 /* Still must send status, 3777 SCF_TRANSPORT_TASK_SENSE was set */ 3778 spin_lock_bh(&cmd->istate_lock); 3779 cmd->i_state = ISTATE_SEND_STATUS; 3780 spin_unlock_bh(&cmd->istate_lock); 3781 state = ISTATE_SEND_STATUS; 3782 goto check_rsp_state; 3783 } 3784 3785 break; 3786 case ISTATE_SEND_STATUS: 3787 case ISTATE_SEND_STATUS_RECOVERY: 3788 ret = iscsit_send_response(cmd, conn); 3789 break; 3790 case ISTATE_SEND_LOGOUTRSP: 3791 ret = iscsit_send_logout(cmd, conn); 3792 break; 3793 case ISTATE_SEND_ASYNCMSG: 3794 ret = iscsit_send_conn_drop_async_message( 3795 cmd, conn); 3796 break; 3797 case ISTATE_SEND_NOPIN: 3798 ret = iscsit_send_nopin(cmd, conn); 3799 break; 3800 case ISTATE_SEND_REJECT: 3801 ret = iscsit_send_reject(cmd, conn); 3802 break; 3803 case ISTATE_SEND_TASKMGTRSP: 3804 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3805 if (ret != 0) 3806 break; 3807 ret = iscsit_tmr_post_handler(cmd, conn); 3808 if (ret != 0) 3809 iscsit_fall_back_to_erl0(conn->sess); 3810 break; 3811 case ISTATE_SEND_TEXTRSP: 3812 ret = iscsit_send_text_rsp(cmd, conn); 3813 break; 3814 default: 3815 pr_err("Unknown Opcode: 0x%02x ITT:" 3816 " 0x%08x, i_state: %d on CID: %hu\n", 3817 cmd->iscsi_opcode, cmd->init_task_tag, 3818 state, conn->cid); 3819 goto err; 3820 } 3821 if (ret < 0) 3822 goto err; 3823 3824 switch (state) { 3825 case ISTATE_SEND_LOGOUTRSP: 3826 if (!iscsit_logout_post_handler(cmd, conn)) 3827 return -ECONNRESET; 3828 fallthrough; 3829 case ISTATE_SEND_STATUS: 3830 case ISTATE_SEND_ASYNCMSG: 3831 case ISTATE_SEND_NOPIN: 3832 case ISTATE_SEND_STATUS_RECOVERY: 3833 case ISTATE_SEND_TEXTRSP: 3834 case ISTATE_SEND_TASKMGTRSP: 3835 case ISTATE_SEND_REJECT: 3836 spin_lock_bh(&cmd->istate_lock); 3837 cmd->i_state = ISTATE_SENT_STATUS; 3838 spin_unlock_bh(&cmd->istate_lock); 3839 break; 3840 default: 3841 pr_err("Unknown Opcode: 0x%02x ITT:" 3842 " 0x%08x, i_state: %d on CID: %hu\n", 3843 cmd->iscsi_opcode, cmd->init_task_tag, 3844 cmd->i_state, conn->cid); 3845 goto err; 3846 } 3847 3848 if (atomic_read(&conn->check_immediate_queue)) 3849 return 1; 3850 3851 return 0; 3852 3853 err: 3854 return -1; 3855 } 3856 EXPORT_SYMBOL(iscsit_response_queue); 3857 3858 static int iscsit_handle_response_queue(struct iscsit_conn *conn) 3859 { 3860 struct iscsit_transport *t = conn->conn_transport; 3861 struct iscsi_queue_req *qr; 3862 struct iscsit_cmd *cmd; 3863 u8 state; 3864 int ret; 3865 3866 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3867 cmd = qr->cmd; 3868 state = qr->state; 3869 kmem_cache_free(lio_qr_cache, qr); 3870 3871 ret = t->iscsit_response_queue(conn, cmd, state); 3872 if (ret == 1 || ret < 0) 3873 return ret; 3874 } 3875 3876 return 0; 3877 } 3878 3879 int iscsi_target_tx_thread(void *arg) 3880 { 3881 int ret = 0; 3882 struct iscsit_conn *conn = arg; 3883 bool conn_freed = false; 3884 3885 /* 3886 * Allow ourselves to be interrupted by SIGINT so that a 3887 * connection recovery / failure event can be triggered externally. 3888 */ 3889 allow_signal(SIGINT); 3890 3891 while (!kthread_should_stop()) { 3892 /* 3893 * Ensure that both TX and RX per connection kthreads 3894 * are scheduled to run on the same CPU. 3895 */ 3896 iscsit_thread_check_cpumask(conn, current, 1); 3897 3898 wait_event_interruptible(conn->queues_wq, 3899 !iscsit_conn_all_queues_empty(conn)); 3900 3901 if (signal_pending(current)) 3902 goto transport_err; 3903 3904 get_immediate: 3905 ret = iscsit_handle_immediate_queue(conn); 3906 if (ret < 0) 3907 goto transport_err; 3908 3909 ret = iscsit_handle_response_queue(conn); 3910 if (ret == 1) { 3911 goto get_immediate; 3912 } else if (ret == -ECONNRESET) { 3913 conn_freed = true; 3914 goto out; 3915 } else if (ret < 0) { 3916 goto transport_err; 3917 } 3918 } 3919 3920 transport_err: 3921 /* 3922 * Avoid the normal connection failure code-path if this connection 3923 * is still within LOGIN mode, and iscsi_np process context is 3924 * responsible for cleaning up the early connection failure. 3925 */ 3926 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3927 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3928 out: 3929 if (!conn_freed) { 3930 while (!kthread_should_stop()) { 3931 msleep(100); 3932 } 3933 } 3934 return 0; 3935 } 3936 3937 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf) 3938 { 3939 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3940 struct iscsit_cmd *cmd; 3941 int ret = 0; 3942 3943 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3944 case ISCSI_OP_SCSI_CMD: 3945 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3946 if (!cmd) 3947 goto reject; 3948 3949 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3950 break; 3951 case ISCSI_OP_SCSI_DATA_OUT: 3952 ret = iscsit_handle_data_out(conn, buf); 3953 break; 3954 case ISCSI_OP_NOOP_OUT: 3955 cmd = NULL; 3956 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3957 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3958 if (!cmd) 3959 goto reject; 3960 } 3961 ret = iscsit_handle_nop_out(conn, cmd, buf); 3962 break; 3963 case ISCSI_OP_SCSI_TMFUNC: 3964 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3965 if (!cmd) 3966 goto reject; 3967 3968 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3969 break; 3970 case ISCSI_OP_TEXT: 3971 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3972 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3973 if (!cmd) 3974 goto reject; 3975 } else { 3976 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3977 if (!cmd) 3978 goto reject; 3979 } 3980 3981 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3982 break; 3983 case ISCSI_OP_LOGOUT: 3984 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3985 if (!cmd) 3986 goto reject; 3987 3988 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3989 if (ret > 0) 3990 wait_for_completion_timeout(&conn->conn_logout_comp, 3991 SECONDS_FOR_LOGOUT_COMP * HZ); 3992 break; 3993 case ISCSI_OP_SNACK: 3994 ret = iscsit_handle_snack(conn, buf); 3995 break; 3996 default: 3997 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3998 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3999 pr_err("Cannot recover from unknown" 4000 " opcode while ERL=0, closing iSCSI connection.\n"); 4001 return -1; 4002 } 4003 pr_err("Unable to recover from unknown opcode while OFMarker=No," 4004 " closing iSCSI connection.\n"); 4005 ret = -1; 4006 break; 4007 } 4008 4009 return ret; 4010 reject: 4011 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4012 } 4013 4014 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn) 4015 { 4016 bool ret; 4017 4018 spin_lock_bh(&conn->state_lock); 4019 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 4020 spin_unlock_bh(&conn->state_lock); 4021 4022 return ret; 4023 } 4024 4025 static void iscsit_get_rx_pdu(struct iscsit_conn *conn) 4026 { 4027 int ret; 4028 u8 *buffer, *tmp_buf, opcode; 4029 u32 checksum = 0, digest = 0; 4030 struct iscsi_hdr *hdr; 4031 struct kvec iov; 4032 4033 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 4034 if (!buffer) 4035 return; 4036 4037 while (!kthread_should_stop()) { 4038 /* 4039 * Ensure that both TX and RX per connection kthreads 4040 * are scheduled to run on the same CPU. 4041 */ 4042 iscsit_thread_check_cpumask(conn, current, 0); 4043 4044 memset(&iov, 0, sizeof(struct kvec)); 4045 4046 iov.iov_base = buffer; 4047 iov.iov_len = ISCSI_HDR_LEN; 4048 4049 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4050 if (ret != ISCSI_HDR_LEN) { 4051 iscsit_rx_thread_wait_for_tcp(conn); 4052 break; 4053 } 4054 4055 hdr = (struct iscsi_hdr *) buffer; 4056 if (hdr->hlength) { 4057 iov.iov_len = hdr->hlength * 4; 4058 tmp_buf = krealloc(buffer, 4059 ISCSI_HDR_LEN + iov.iov_len, 4060 GFP_KERNEL); 4061 if (!tmp_buf) 4062 break; 4063 4064 buffer = tmp_buf; 4065 iov.iov_base = &buffer[ISCSI_HDR_LEN]; 4066 4067 ret = rx_data(conn, &iov, 1, iov.iov_len); 4068 if (ret != iov.iov_len) { 4069 iscsit_rx_thread_wait_for_tcp(conn); 4070 break; 4071 } 4072 } 4073 4074 if (conn->conn_ops->HeaderDigest) { 4075 iov.iov_base = &digest; 4076 iov.iov_len = ISCSI_CRC_LEN; 4077 4078 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4079 if (ret != ISCSI_CRC_LEN) { 4080 iscsit_rx_thread_wait_for_tcp(conn); 4081 break; 4082 } 4083 4084 checksum = iscsit_crc_buf(buffer, ISCSI_HDR_LEN, 0, 4085 NULL); 4086 if (digest != checksum) { 4087 pr_err("HeaderDigest CRC32C failed," 4088 " received 0x%08x, computed 0x%08x\n", 4089 digest, checksum); 4090 /* 4091 * Set the PDU to 0xff so it will intentionally 4092 * hit default in the switch below. 4093 */ 4094 memset(buffer, 0xff, ISCSI_HDR_LEN); 4095 atomic_long_inc(&conn->sess->conn_digest_errors); 4096 } else { 4097 pr_debug("Got HeaderDigest CRC32C" 4098 " 0x%08x\n", checksum); 4099 } 4100 } 4101 4102 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4103 break; 4104 4105 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4106 4107 if (conn->sess->sess_ops->SessionType && 4108 ((!(opcode & ISCSI_OP_TEXT)) || 4109 (!(opcode & ISCSI_OP_LOGOUT)))) { 4110 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4111 " while in Discovery Session, rejecting.\n", opcode); 4112 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4113 buffer); 4114 break; 4115 } 4116 4117 ret = iscsi_target_rx_opcode(conn, buffer); 4118 if (ret < 0) 4119 break; 4120 } 4121 4122 kfree(buffer); 4123 } 4124 4125 int iscsi_target_rx_thread(void *arg) 4126 { 4127 int rc; 4128 struct iscsit_conn *conn = arg; 4129 bool conn_freed = false; 4130 4131 /* 4132 * Allow ourselves to be interrupted by SIGINT so that a 4133 * connection recovery / failure event can be triggered externally. 4134 */ 4135 allow_signal(SIGINT); 4136 /* 4137 * Wait for iscsi_post_login_handler() to complete before allowing 4138 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4139 */ 4140 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4141 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4142 goto out; 4143 4144 if (!conn->conn_transport->iscsit_get_rx_pdu) 4145 return 0; 4146 4147 conn->conn_transport->iscsit_get_rx_pdu(conn); 4148 4149 if (!signal_pending(current)) 4150 atomic_set(&conn->transport_failed, 1); 4151 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4152 4153 out: 4154 if (!conn_freed) { 4155 while (!kthread_should_stop()) { 4156 msleep(100); 4157 } 4158 } 4159 4160 return 0; 4161 } 4162 4163 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn) 4164 { 4165 LIST_HEAD(tmp_list); 4166 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL; 4167 struct iscsit_session *sess = conn->sess; 4168 /* 4169 * We expect this function to only ever be called from either RX or TX 4170 * thread context via iscsit_close_connection() once the other context 4171 * has been reset -> returned sleeping pre-handler state. 4172 */ 4173 spin_lock_bh(&conn->cmd_lock); 4174 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4175 4176 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4177 struct se_cmd *se_cmd = &cmd->se_cmd; 4178 4179 if (!se_cmd->se_tfo) 4180 continue; 4181 4182 spin_lock_irq(&se_cmd->t_state_lock); 4183 if (se_cmd->transport_state & CMD_T_ABORTED) { 4184 if (!(se_cmd->transport_state & CMD_T_TAS)) 4185 /* 4186 * LIO's abort path owns the cleanup for this, 4187 * so put it back on the list and let 4188 * aborted_task handle it. 4189 */ 4190 list_move_tail(&cmd->i_conn_node, 4191 &conn->conn_cmd_list); 4192 } else { 4193 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4194 } 4195 4196 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 4197 /* 4198 * We never submitted the cmd to LIO core, so we have 4199 * to tell LIO to perform the completion process. 4200 */ 4201 spin_unlock_irq(&se_cmd->t_state_lock); 4202 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED); 4203 continue; 4204 } 4205 spin_unlock_irq(&se_cmd->t_state_lock); 4206 } 4207 spin_unlock_bh(&conn->cmd_lock); 4208 4209 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4210 list_del_init(&cmd->i_conn_node); 4211 4212 iscsit_increment_maxcmdsn(cmd, sess); 4213 iscsit_free_cmd(cmd, true); 4214 4215 } 4216 4217 /* 4218 * Wait on commands that were cleaned up via the aborted_task path. 4219 * LLDs that implement iscsit_wait_conn will already have waited for 4220 * commands. 4221 */ 4222 if (!conn->conn_transport->iscsit_wait_conn) { 4223 target_stop_cmd_counter(conn->cmd_cnt); 4224 target_wait_for_cmds(conn->cmd_cnt); 4225 } 4226 } 4227 4228 static void iscsit_stop_timers_for_cmds( 4229 struct iscsit_conn *conn) 4230 { 4231 struct iscsit_cmd *cmd; 4232 4233 spin_lock_bh(&conn->cmd_lock); 4234 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4235 if (cmd->data_direction == DMA_TO_DEVICE) 4236 iscsit_stop_dataout_timer(cmd); 4237 } 4238 spin_unlock_bh(&conn->cmd_lock); 4239 } 4240 4241 int iscsit_close_connection( 4242 struct iscsit_conn *conn) 4243 { 4244 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4245 struct iscsit_session *sess = conn->sess; 4246 4247 pr_debug("Closing iSCSI connection CID %hu on SID:" 4248 " %u\n", conn->cid, sess->sid); 4249 /* 4250 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4251 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4252 * sleeping and the logout response never got sent because the 4253 * connection failed. 4254 * 4255 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4256 * to signal logout response TX interrupt completion. Go ahead and skip 4257 * this for iser since isert_rx_opcode() does not wait on logout failure, 4258 * and to avoid iscsit_conn pointer dereference in iser-target code. 4259 */ 4260 if (!conn->conn_transport->rdma_shutdown) 4261 complete(&conn->conn_logout_comp); 4262 4263 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4264 if (conn->tx_thread && 4265 cmpxchg(&conn->tx_thread_active, true, false)) { 4266 send_sig(SIGINT, conn->tx_thread, 1); 4267 kthread_stop(conn->tx_thread); 4268 } 4269 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4270 if (conn->rx_thread && 4271 cmpxchg(&conn->rx_thread_active, true, false)) { 4272 send_sig(SIGINT, conn->rx_thread, 1); 4273 kthread_stop(conn->rx_thread); 4274 } 4275 } 4276 4277 spin_lock(&iscsit_global->ts_bitmap_lock); 4278 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4279 get_order(1)); 4280 spin_unlock(&iscsit_global->ts_bitmap_lock); 4281 4282 iscsit_stop_timers_for_cmds(conn); 4283 iscsit_stop_nopin_timer(conn); 4284 iscsit_stop_nopin_response_timer(conn); 4285 4286 if (conn->conn_transport->iscsit_wait_conn) 4287 conn->conn_transport->iscsit_wait_conn(conn); 4288 4289 /* 4290 * During Connection recovery drop unacknowledged out of order 4291 * commands for this connection, and prepare the other commands 4292 * for reallegiance. 4293 * 4294 * During normal operation clear the out of order commands (but 4295 * do not free the struct iscsi_ooo_cmdsn's) and release all 4296 * struct iscsit_cmds. 4297 */ 4298 if (atomic_read(&conn->connection_recovery)) { 4299 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4300 iscsit_prepare_cmds_for_reallegiance(conn); 4301 } else { 4302 iscsit_clear_ooo_cmdsns_for_conn(conn); 4303 iscsit_release_commands_from_conn(conn); 4304 } 4305 iscsit_free_queue_reqs_for_conn(conn); 4306 4307 /* 4308 * Handle decrementing session or connection usage count if 4309 * a logout response was not able to be sent because the 4310 * connection failed. Fall back to Session Recovery here. 4311 */ 4312 if (atomic_read(&conn->conn_logout_remove)) { 4313 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4314 iscsit_dec_conn_usage_count(conn); 4315 iscsit_dec_session_usage_count(sess); 4316 } 4317 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4318 iscsit_dec_conn_usage_count(conn); 4319 4320 atomic_set(&conn->conn_logout_remove, 0); 4321 atomic_set(&sess->session_reinstatement, 0); 4322 atomic_set(&sess->session_fall_back_to_erl0, 1); 4323 } 4324 4325 spin_lock_bh(&sess->conn_lock); 4326 list_del(&conn->conn_list); 4327 4328 /* 4329 * Attempt to let the Initiator know this connection failed by 4330 * sending an Connection Dropped Async Message on another 4331 * active connection. 4332 */ 4333 if (atomic_read(&conn->connection_recovery)) 4334 iscsit_build_conn_drop_async_message(conn); 4335 4336 spin_unlock_bh(&sess->conn_lock); 4337 4338 /* 4339 * If connection reinstatement is being performed on this connection, 4340 * up the connection reinstatement semaphore that is being blocked on 4341 * in iscsit_cause_connection_reinstatement(). 4342 */ 4343 spin_lock_bh(&conn->state_lock); 4344 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4345 spin_unlock_bh(&conn->state_lock); 4346 complete(&conn->conn_wait_comp); 4347 wait_for_completion(&conn->conn_post_wait_comp); 4348 spin_lock_bh(&conn->state_lock); 4349 } 4350 4351 /* 4352 * If connection reinstatement is being performed on this connection 4353 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4354 * connection wait rcfr semaphore that is being blocked on 4355 * an iscsit_connection_reinstatement_rcfr(). 4356 */ 4357 if (atomic_read(&conn->connection_wait_rcfr)) { 4358 spin_unlock_bh(&conn->state_lock); 4359 complete(&conn->conn_wait_rcfr_comp); 4360 wait_for_completion(&conn->conn_post_wait_comp); 4361 spin_lock_bh(&conn->state_lock); 4362 } 4363 atomic_set(&conn->connection_reinstatement, 1); 4364 spin_unlock_bh(&conn->state_lock); 4365 4366 /* 4367 * If any other processes are accessing this connection pointer we 4368 * must wait until they have completed. 4369 */ 4370 iscsit_check_conn_usage_count(conn); 4371 4372 if (conn->sock) 4373 sock_release(conn->sock); 4374 4375 if (conn->conn_transport->iscsit_free_conn) 4376 conn->conn_transport->iscsit_free_conn(conn); 4377 4378 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4379 conn->conn_state = TARG_CONN_STATE_FREE; 4380 iscsit_free_conn(conn); 4381 4382 spin_lock_bh(&sess->conn_lock); 4383 atomic_dec(&sess->nconn); 4384 pr_debug("Decremented iSCSI connection count to %d from node:" 4385 " %s\n", atomic_read(&sess->nconn), 4386 sess->sess_ops->InitiatorName); 4387 /* 4388 * Make sure that if one connection fails in an non ERL=2 iSCSI 4389 * Session that they all fail. 4390 */ 4391 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4392 !atomic_read(&sess->session_logout)) 4393 atomic_set(&sess->session_fall_back_to_erl0, 1); 4394 4395 /* 4396 * If this was not the last connection in the session, and we are 4397 * performing session reinstatement or falling back to ERL=0, call 4398 * iscsit_stop_session() without sleeping to shutdown the other 4399 * active connections. 4400 */ 4401 if (atomic_read(&sess->nconn)) { 4402 if (!atomic_read(&sess->session_reinstatement) && 4403 !atomic_read(&sess->session_fall_back_to_erl0)) { 4404 spin_unlock_bh(&sess->conn_lock); 4405 return 0; 4406 } 4407 if (!atomic_read(&sess->session_stop_active)) { 4408 atomic_set(&sess->session_stop_active, 1); 4409 spin_unlock_bh(&sess->conn_lock); 4410 iscsit_stop_session(sess, 0, 0); 4411 return 0; 4412 } 4413 spin_unlock_bh(&sess->conn_lock); 4414 return 0; 4415 } 4416 4417 /* 4418 * If this was the last connection in the session and one of the 4419 * following is occurring: 4420 * 4421 * Session Reinstatement is not being performed, and are falling back 4422 * to ERL=0 call iscsit_close_session(). 4423 * 4424 * Session Logout was requested. iscsit_close_session() will be called 4425 * elsewhere. 4426 * 4427 * Session Continuation is not being performed, start the Time2Retain 4428 * handler and check if sleep_on_sess_wait_sem is active. 4429 */ 4430 if (!atomic_read(&sess->session_reinstatement) && 4431 atomic_read(&sess->session_fall_back_to_erl0)) { 4432 spin_unlock_bh(&sess->conn_lock); 4433 complete_all(&sess->session_wait_comp); 4434 iscsit_close_session(sess, true); 4435 4436 return 0; 4437 } else if (atomic_read(&sess->session_logout)) { 4438 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4439 sess->session_state = TARG_SESS_STATE_FREE; 4440 4441 if (atomic_read(&sess->session_close)) { 4442 spin_unlock_bh(&sess->conn_lock); 4443 complete_all(&sess->session_wait_comp); 4444 iscsit_close_session(sess, true); 4445 } else { 4446 spin_unlock_bh(&sess->conn_lock); 4447 } 4448 4449 return 0; 4450 } else { 4451 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4452 sess->session_state = TARG_SESS_STATE_FAILED; 4453 4454 if (!atomic_read(&sess->session_continuation)) 4455 iscsit_start_time2retain_handler(sess); 4456 4457 if (atomic_read(&sess->session_close)) { 4458 spin_unlock_bh(&sess->conn_lock); 4459 complete_all(&sess->session_wait_comp); 4460 iscsit_close_session(sess, true); 4461 } else { 4462 spin_unlock_bh(&sess->conn_lock); 4463 } 4464 4465 return 0; 4466 } 4467 } 4468 4469 /* 4470 * If the iSCSI Session for the iSCSI Initiator Node exists, 4471 * forcefully shutdown the iSCSI NEXUS. 4472 */ 4473 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) 4474 { 4475 struct iscsi_portal_group *tpg = sess->tpg; 4476 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4477 4478 if (atomic_read(&sess->nconn)) { 4479 pr_err("%d connection(s) still exist for iSCSI session" 4480 " to %s\n", atomic_read(&sess->nconn), 4481 sess->sess_ops->InitiatorName); 4482 BUG(); 4483 } 4484 4485 spin_lock_bh(&se_tpg->session_lock); 4486 atomic_set(&sess->session_logout, 1); 4487 atomic_set(&sess->session_reinstatement, 1); 4488 iscsit_stop_time2retain_timer(sess); 4489 spin_unlock_bh(&se_tpg->session_lock); 4490 4491 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4492 iscsit_free_connection_recovery_entries(sess); 4493 4494 /* 4495 * transport_deregister_session_configfs() will clear the 4496 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4497 * can be setting it again with __transport_register_session() in 4498 * iscsi_post_login_handler() again after the iscsit_stop_session() 4499 * completes in iscsi_np context. 4500 */ 4501 transport_deregister_session_configfs(sess->se_sess); 4502 4503 /* 4504 * If any other processes are accessing this session pointer we must 4505 * wait until they have completed. If we are in an interrupt (the 4506 * time2retain handler) and contain and active session usage count we 4507 * restart the timer and exit. 4508 */ 4509 if (iscsit_check_session_usage_count(sess, can_sleep)) { 4510 atomic_set(&sess->session_logout, 0); 4511 iscsit_start_time2retain_handler(sess); 4512 return 0; 4513 } 4514 4515 transport_deregister_session(sess->se_sess); 4516 4517 iscsit_free_all_ooo_cmdsns(sess); 4518 4519 spin_lock_bh(&se_tpg->session_lock); 4520 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4521 sess->session_state = TARG_SESS_STATE_FREE; 4522 pr_debug("Released iSCSI session from node: %s\n", 4523 sess->sess_ops->InitiatorName); 4524 tpg->nsessions--; 4525 if (tpg->tpg_tiqn) 4526 tpg->tpg_tiqn->tiqn_nsessions--; 4527 4528 pr_debug("Decremented number of active iSCSI Sessions on" 4529 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4530 4531 ida_free(&sess_ida, sess->session_index); 4532 kfree(sess->sess_ops); 4533 sess->sess_ops = NULL; 4534 spin_unlock_bh(&se_tpg->session_lock); 4535 4536 kfree(sess); 4537 return 0; 4538 } 4539 4540 static void iscsit_logout_post_handler_closesession( 4541 struct iscsit_conn *conn) 4542 { 4543 struct iscsit_session *sess = conn->sess; 4544 int sleep = 1; 4545 /* 4546 * Traditional iscsi/tcp will invoke this logic from TX thread 4547 * context during session logout, so clear tx_thread_active and 4548 * sleep if iscsit_close_connection() has not already occured. 4549 * 4550 * Since iser-target invokes this logic from it's own workqueue, 4551 * always sleep waiting for RX/TX thread shutdown to complete 4552 * within iscsit_close_connection(). 4553 */ 4554 if (!conn->conn_transport->rdma_shutdown) { 4555 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4556 if (!sleep) 4557 return; 4558 } 4559 4560 atomic_set(&conn->conn_logout_remove, 0); 4561 complete(&conn->conn_logout_comp); 4562 4563 iscsit_dec_conn_usage_count(conn); 4564 atomic_set(&sess->session_close, 1); 4565 iscsit_stop_session(sess, sleep, sleep); 4566 iscsit_dec_session_usage_count(sess); 4567 } 4568 4569 static void iscsit_logout_post_handler_samecid( 4570 struct iscsit_conn *conn) 4571 { 4572 int sleep = 1; 4573 4574 if (!conn->conn_transport->rdma_shutdown) { 4575 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4576 if (!sleep) 4577 return; 4578 } 4579 4580 atomic_set(&conn->conn_logout_remove, 0); 4581 complete(&conn->conn_logout_comp); 4582 4583 iscsit_cause_connection_reinstatement(conn, sleep); 4584 iscsit_dec_conn_usage_count(conn); 4585 } 4586 4587 static void iscsit_logout_post_handler_diffcid( 4588 struct iscsit_conn *conn, 4589 u16 cid) 4590 { 4591 struct iscsit_conn *l_conn; 4592 struct iscsit_session *sess = conn->sess; 4593 bool conn_found = false; 4594 4595 if (!sess) 4596 return; 4597 4598 spin_lock_bh(&sess->conn_lock); 4599 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4600 if (l_conn->cid == cid) { 4601 iscsit_inc_conn_usage_count(l_conn); 4602 conn_found = true; 4603 break; 4604 } 4605 } 4606 spin_unlock_bh(&sess->conn_lock); 4607 4608 if (!conn_found) 4609 return; 4610 4611 if (l_conn->sock) 4612 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4613 4614 spin_lock_bh(&l_conn->state_lock); 4615 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4616 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4617 spin_unlock_bh(&l_conn->state_lock); 4618 4619 iscsit_cause_connection_reinstatement(l_conn, 1); 4620 iscsit_dec_conn_usage_count(l_conn); 4621 } 4622 4623 /* 4624 * Return of 0 causes the TX thread to restart. 4625 */ 4626 int iscsit_logout_post_handler( 4627 struct iscsit_cmd *cmd, 4628 struct iscsit_conn *conn) 4629 { 4630 int ret = 0; 4631 4632 switch (cmd->logout_reason) { 4633 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4634 switch (cmd->logout_response) { 4635 case ISCSI_LOGOUT_SUCCESS: 4636 case ISCSI_LOGOUT_CLEANUP_FAILED: 4637 default: 4638 iscsit_logout_post_handler_closesession(conn); 4639 break; 4640 } 4641 break; 4642 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4643 if (conn->cid == cmd->logout_cid) { 4644 switch (cmd->logout_response) { 4645 case ISCSI_LOGOUT_SUCCESS: 4646 case ISCSI_LOGOUT_CLEANUP_FAILED: 4647 default: 4648 iscsit_logout_post_handler_samecid(conn); 4649 break; 4650 } 4651 } else { 4652 switch (cmd->logout_response) { 4653 case ISCSI_LOGOUT_SUCCESS: 4654 iscsit_logout_post_handler_diffcid(conn, 4655 cmd->logout_cid); 4656 break; 4657 case ISCSI_LOGOUT_CID_NOT_FOUND: 4658 case ISCSI_LOGOUT_CLEANUP_FAILED: 4659 default: 4660 break; 4661 } 4662 ret = 1; 4663 } 4664 break; 4665 case ISCSI_LOGOUT_REASON_RECOVERY: 4666 switch (cmd->logout_response) { 4667 case ISCSI_LOGOUT_SUCCESS: 4668 case ISCSI_LOGOUT_CID_NOT_FOUND: 4669 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4670 case ISCSI_LOGOUT_CLEANUP_FAILED: 4671 default: 4672 break; 4673 } 4674 ret = 1; 4675 break; 4676 default: 4677 break; 4678 4679 } 4680 return ret; 4681 } 4682 EXPORT_SYMBOL(iscsit_logout_post_handler); 4683 4684 void iscsit_stop_session( 4685 struct iscsit_session *sess, 4686 int session_sleep, 4687 int connection_sleep) 4688 { 4689 u16 conn_count = atomic_read(&sess->nconn); 4690 struct iscsit_conn *conn, *conn_tmp = NULL; 4691 int is_last; 4692 4693 spin_lock_bh(&sess->conn_lock); 4694 4695 if (connection_sleep) { 4696 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4697 conn_list) { 4698 if (conn_count == 0) 4699 break; 4700 4701 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4702 is_last = 1; 4703 } else { 4704 iscsit_inc_conn_usage_count(conn_tmp); 4705 is_last = 0; 4706 } 4707 iscsit_inc_conn_usage_count(conn); 4708 4709 spin_unlock_bh(&sess->conn_lock); 4710 iscsit_cause_connection_reinstatement(conn, 1); 4711 spin_lock_bh(&sess->conn_lock); 4712 4713 iscsit_dec_conn_usage_count(conn); 4714 if (is_last == 0) 4715 iscsit_dec_conn_usage_count(conn_tmp); 4716 conn_count--; 4717 } 4718 } else { 4719 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4720 iscsit_cause_connection_reinstatement(conn, 0); 4721 } 4722 4723 if (session_sleep && atomic_read(&sess->nconn)) { 4724 spin_unlock_bh(&sess->conn_lock); 4725 wait_for_completion(&sess->session_wait_comp); 4726 } else 4727 spin_unlock_bh(&sess->conn_lock); 4728 } 4729 4730 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4731 { 4732 struct iscsit_session *sess; 4733 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4734 struct se_session *se_sess, *se_sess_tmp; 4735 LIST_HEAD(free_list); 4736 int session_count = 0; 4737 4738 spin_lock_bh(&se_tpg->session_lock); 4739 if (tpg->nsessions && !force) { 4740 spin_unlock_bh(&se_tpg->session_lock); 4741 return -1; 4742 } 4743 4744 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4745 sess_list) { 4746 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4747 4748 spin_lock(&sess->conn_lock); 4749 if (atomic_read(&sess->session_fall_back_to_erl0) || 4750 atomic_read(&sess->session_logout) || 4751 atomic_read(&sess->session_close) || 4752 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4753 spin_unlock(&sess->conn_lock); 4754 continue; 4755 } 4756 iscsit_inc_session_usage_count(sess); 4757 atomic_set(&sess->session_reinstatement, 1); 4758 atomic_set(&sess->session_fall_back_to_erl0, 1); 4759 atomic_set(&sess->session_close, 1); 4760 spin_unlock(&sess->conn_lock); 4761 4762 list_move_tail(&se_sess->sess_list, &free_list); 4763 } 4764 spin_unlock_bh(&se_tpg->session_lock); 4765 4766 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4767 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4768 4769 list_del_init(&se_sess->sess_list); 4770 iscsit_stop_session(sess, 1, 1); 4771 iscsit_dec_session_usage_count(sess); 4772 session_count++; 4773 } 4774 4775 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4776 " Group: %hu\n", session_count, tpg->tpgt); 4777 return 0; 4778 } 4779 4780 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4781 MODULE_VERSION("4.1.x"); 4782 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4783 MODULE_LICENSE("GPL"); 4784 4785 module_init(iscsi_target_init_module); 4786 module_exit(iscsi_target_cleanup_module); 4787