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, rx_size, 0, NULL); 2299 if (checksum != data_crc) { 2300 pr_err("Text data CRC32C DataDigest" 2301 " 0x%08x does not match computed" 2302 " 0x%08x\n", checksum, data_crc); 2303 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2304 pr_err("Unable to recover from" 2305 " Text Data digest failure while in" 2306 " ERL=0.\n"); 2307 goto reject; 2308 } else { 2309 /* 2310 * Silently drop this PDU and let the 2311 * initiator plug the CmdSN gap. 2312 */ 2313 pr_debug("Dropping Text" 2314 " Command CmdSN: 0x%08x due to" 2315 " DataCRC error.\n", hdr->cmdsn); 2316 kfree(text_in); 2317 return 0; 2318 } 2319 } else { 2320 pr_debug("Got CRC32C DataDigest" 2321 " 0x%08x for %u bytes of text data.\n", 2322 checksum, payload_length); 2323 } 2324 } 2325 text_in[payload_length - 1] = '\0'; 2326 pr_debug("Successfully read %d bytes of text" 2327 " data.\n", payload_length); 2328 } 2329 2330 return iscsit_process_text_cmd(conn, cmd, hdr); 2331 2332 reject: 2333 kfree(cmd->text_in_ptr); 2334 cmd->text_in_ptr = NULL; 2335 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2336 } 2337 2338 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2339 { 2340 struct iscsit_conn *conn_p; 2341 struct iscsit_session *sess = conn->sess; 2342 2343 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2344 " for SID: %u.\n", conn->cid, conn->sess->sid); 2345 2346 atomic_set(&sess->session_logout, 1); 2347 atomic_set(&conn->conn_logout_remove, 1); 2348 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2349 2350 iscsit_inc_conn_usage_count(conn); 2351 iscsit_inc_session_usage_count(sess); 2352 2353 spin_lock_bh(&sess->conn_lock); 2354 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2355 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2356 continue; 2357 2358 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2359 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2360 } 2361 spin_unlock_bh(&sess->conn_lock); 2362 2363 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2364 2365 return 0; 2366 } 2367 2368 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2369 { 2370 struct iscsit_conn *l_conn; 2371 struct iscsit_session *sess = conn->sess; 2372 2373 pr_debug("Received logout request CLOSECONNECTION for CID:" 2374 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2375 2376 /* 2377 * A Logout Request with a CLOSECONNECTION reason code for a CID 2378 * can arrive on a connection with a differing CID. 2379 */ 2380 if (conn->cid == cmd->logout_cid) { 2381 spin_lock_bh(&conn->state_lock); 2382 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2383 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2384 2385 atomic_set(&conn->conn_logout_remove, 1); 2386 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2387 iscsit_inc_conn_usage_count(conn); 2388 2389 spin_unlock_bh(&conn->state_lock); 2390 } else { 2391 /* 2392 * Handle all different cid CLOSECONNECTION requests in 2393 * iscsit_logout_post_handler_diffcid() as to give enough 2394 * time for any non immediate command's CmdSN to be 2395 * acknowledged on the connection in question. 2396 * 2397 * Here we simply make sure the CID is still around. 2398 */ 2399 l_conn = iscsit_get_conn_from_cid(sess, 2400 cmd->logout_cid); 2401 if (!l_conn) { 2402 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2403 iscsit_add_cmd_to_response_queue(cmd, conn, 2404 cmd->i_state); 2405 return 0; 2406 } 2407 2408 iscsit_dec_conn_usage_count(l_conn); 2409 } 2410 2411 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2412 2413 return 0; 2414 } 2415 2416 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2417 { 2418 struct iscsit_session *sess = conn->sess; 2419 2420 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2421 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2422 2423 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2425 " while ERL!=2.\n"); 2426 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2428 return 0; 2429 } 2430 2431 if (conn->cid == cmd->logout_cid) { 2432 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2433 " with CID: %hu on CID: %hu, implementation error.\n", 2434 cmd->logout_cid, conn->cid); 2435 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2436 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2437 return 0; 2438 } 2439 2440 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2441 2442 return 0; 2443 } 2444 2445 int 2446 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2447 unsigned char *buf) 2448 { 2449 int cmdsn_ret, logout_remove = 0; 2450 u8 reason_code = 0; 2451 struct iscsi_logout *hdr; 2452 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2453 2454 hdr = (struct iscsi_logout *) buf; 2455 reason_code = (hdr->flags & 0x7f); 2456 2457 if (tiqn) { 2458 spin_lock(&tiqn->logout_stats.lock); 2459 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2460 tiqn->logout_stats.normal_logouts++; 2461 else 2462 tiqn->logout_stats.abnormal_logouts++; 2463 spin_unlock(&tiqn->logout_stats.lock); 2464 } 2465 2466 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2467 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2468 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2469 hdr->cid, conn->cid); 2470 2471 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2472 pr_err("Received logout request on connection that" 2473 " is not in logged in state, ignoring request.\n"); 2474 iscsit_free_cmd(cmd, false); 2475 return 0; 2476 } 2477 2478 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2479 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2480 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2481 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2482 cmd->targ_xfer_tag = 0xFFFFFFFF; 2483 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2484 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2485 cmd->logout_cid = be16_to_cpu(hdr->cid); 2486 cmd->logout_reason = reason_code; 2487 cmd->data_direction = DMA_NONE; 2488 2489 /* 2490 * We need to sleep in these cases (by returning 1) until the Logout 2491 * Response gets sent in the tx thread. 2492 */ 2493 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2494 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2495 be16_to_cpu(hdr->cid) == conn->cid)) 2496 logout_remove = 1; 2497 2498 spin_lock_bh(&conn->cmd_lock); 2499 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2500 spin_unlock_bh(&conn->cmd_lock); 2501 2502 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2503 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2504 2505 /* 2506 * Immediate commands are executed, well, immediately. 2507 * Non-Immediate Logout Commands are executed in CmdSN order. 2508 */ 2509 if (cmd->immediate_cmd) { 2510 int ret = iscsit_execute_cmd(cmd, 0); 2511 2512 if (ret < 0) 2513 return ret; 2514 } else { 2515 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2516 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2517 logout_remove = 0; 2518 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2519 return -1; 2520 } 2521 2522 return logout_remove; 2523 } 2524 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2525 2526 int iscsit_handle_snack( 2527 struct iscsit_conn *conn, 2528 unsigned char *buf) 2529 { 2530 struct iscsi_snack *hdr; 2531 2532 hdr = (struct iscsi_snack *) buf; 2533 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2534 2535 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2536 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2537 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2538 hdr->begrun, hdr->runlength, conn->cid); 2539 2540 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2541 pr_err("Initiator sent SNACK request while in" 2542 " ErrorRecoveryLevel=0.\n"); 2543 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2544 buf); 2545 } 2546 /* 2547 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2548 * call from inside iscsi_send_recovery_datain_or_r2t(). 2549 */ 2550 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2551 case 0: 2552 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2553 hdr->itt, 2554 be32_to_cpu(hdr->ttt), 2555 be32_to_cpu(hdr->begrun), 2556 be32_to_cpu(hdr->runlength)); 2557 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2558 return iscsit_handle_status_snack(conn, hdr->itt, 2559 be32_to_cpu(hdr->ttt), 2560 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2561 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2562 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2563 be32_to_cpu(hdr->begrun), 2564 be32_to_cpu(hdr->runlength)); 2565 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2566 /* FIXME: Support R-Data SNACK */ 2567 pr_err("R-Data SNACK Not Supported.\n"); 2568 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2569 buf); 2570 default: 2571 pr_err("Unknown SNACK type 0x%02x, protocol" 2572 " error.\n", hdr->flags & 0x0f); 2573 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2574 buf); 2575 } 2576 2577 return 0; 2578 } 2579 EXPORT_SYMBOL(iscsit_handle_snack); 2580 2581 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn) 2582 { 2583 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2584 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2585 wait_for_completion_interruptible_timeout( 2586 &conn->rx_half_close_comp, 2587 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2588 } 2589 } 2590 2591 static int iscsit_handle_immediate_data( 2592 struct iscsit_cmd *cmd, 2593 struct iscsi_scsi_req *hdr, 2594 u32 length) 2595 { 2596 int iov_ret, rx_got = 0, rx_size = 0; 2597 u32 checksum, iov_count = 0, padding = 0; 2598 struct iscsit_conn *conn = cmd->conn; 2599 struct kvec *iov; 2600 void *overflow_buf = NULL; 2601 2602 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2603 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2604 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2605 cmd->orig_iov_data_count - 2, 2606 cmd->write_data_done, rx_size); 2607 if (iov_ret < 0) 2608 return IMMEDIATE_DATA_CANNOT_RECOVER; 2609 2610 iov_count = iov_ret; 2611 iov = &cmd->iov_data[0]; 2612 if (rx_size < length) { 2613 /* 2614 * Special case: length of immediate data exceeds the data 2615 * buffer size derived from the CDB. 2616 */ 2617 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2618 if (!overflow_buf) { 2619 iscsit_unmap_iovec(cmd); 2620 return IMMEDIATE_DATA_CANNOT_RECOVER; 2621 } 2622 cmd->overflow_buf = overflow_buf; 2623 iov[iov_count].iov_base = overflow_buf; 2624 iov[iov_count].iov_len = length - rx_size; 2625 iov_count++; 2626 rx_size = length; 2627 } 2628 2629 padding = ((-length) & 3); 2630 if (padding != 0) { 2631 iov[iov_count].iov_base = cmd->pad_bytes; 2632 iov[iov_count++].iov_len = padding; 2633 rx_size += padding; 2634 } 2635 2636 if (conn->conn_ops->DataDigest) { 2637 iov[iov_count].iov_base = &checksum; 2638 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2639 rx_size += ISCSI_CRC_LEN; 2640 } 2641 2642 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2643 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2644 2645 iscsit_unmap_iovec(cmd); 2646 2647 if (rx_got != rx_size) { 2648 iscsit_rx_thread_wait_for_tcp(conn); 2649 return IMMEDIATE_DATA_CANNOT_RECOVER; 2650 } 2651 2652 if (conn->conn_ops->DataDigest) { 2653 u32 data_crc; 2654 2655 data_crc = iscsit_crc_sglist(cmd, length, padding, 2656 cmd->pad_bytes); 2657 if (checksum != data_crc) { 2658 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2659 " does not match computed 0x%08x\n", checksum, 2660 data_crc); 2661 2662 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2663 pr_err("Unable to recover from" 2664 " Immediate Data digest failure while" 2665 " in ERL=0.\n"); 2666 iscsit_reject_cmd(cmd, 2667 ISCSI_REASON_DATA_DIGEST_ERROR, 2668 (unsigned char *)hdr); 2669 return IMMEDIATE_DATA_CANNOT_RECOVER; 2670 } else { 2671 iscsit_reject_cmd(cmd, 2672 ISCSI_REASON_DATA_DIGEST_ERROR, 2673 (unsigned char *)hdr); 2674 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2675 } 2676 } else { 2677 pr_debug("Got CRC32C DataDigest 0x%08x for" 2678 " %u bytes of Immediate Data\n", checksum, 2679 length); 2680 } 2681 } 2682 2683 cmd->write_data_done += length; 2684 2685 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2686 spin_lock_bh(&cmd->istate_lock); 2687 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2688 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2689 spin_unlock_bh(&cmd->istate_lock); 2690 } 2691 2692 return IMMEDIATE_DATA_NORMAL_OPERATION; 2693 } 2694 2695 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2696 with active network interface */ 2697 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn) 2698 { 2699 struct iscsit_cmd *cmd; 2700 struct iscsit_conn *conn_p; 2701 bool found = false; 2702 2703 lockdep_assert_held(&conn->sess->conn_lock); 2704 2705 /* 2706 * Only send a Asynchronous Message on connections whos network 2707 * interface is still functional. 2708 */ 2709 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2710 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2711 iscsit_inc_conn_usage_count(conn_p); 2712 found = true; 2713 break; 2714 } 2715 } 2716 2717 if (!found) 2718 return; 2719 2720 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2721 if (!cmd) { 2722 iscsit_dec_conn_usage_count(conn_p); 2723 return; 2724 } 2725 2726 cmd->logout_cid = conn->cid; 2727 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2728 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2729 2730 spin_lock_bh(&conn_p->cmd_lock); 2731 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2732 spin_unlock_bh(&conn_p->cmd_lock); 2733 2734 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2735 iscsit_dec_conn_usage_count(conn_p); 2736 } 2737 2738 static int iscsit_send_conn_drop_async_message( 2739 struct iscsit_cmd *cmd, 2740 struct iscsit_conn *conn) 2741 { 2742 struct iscsi_async *hdr; 2743 2744 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2745 2746 hdr = (struct iscsi_async *) cmd->pdu; 2747 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2748 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2749 cmd->init_task_tag = RESERVED_ITT; 2750 cmd->targ_xfer_tag = 0xFFFFFFFF; 2751 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2752 cmd->stat_sn = conn->stat_sn++; 2753 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2754 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2755 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2756 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2757 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2758 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2759 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2760 2761 pr_debug("Sending Connection Dropped Async Message StatSN:" 2762 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2763 cmd->logout_cid, conn->cid); 2764 2765 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2766 } 2767 2768 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn) 2769 { 2770 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2771 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2772 wait_for_completion_interruptible_timeout( 2773 &conn->tx_half_close_comp, 2774 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2775 } 2776 } 2777 2778 void 2779 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2780 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2781 bool set_statsn) 2782 { 2783 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2784 hdr->flags = datain->flags; 2785 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2786 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2787 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2788 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2789 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2790 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2791 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2792 } 2793 } 2794 hton24(hdr->dlength, datain->length); 2795 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2796 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2797 (struct scsi_lun *)&hdr->lun); 2798 else 2799 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2800 2801 hdr->itt = cmd->init_task_tag; 2802 2803 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2804 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2805 else 2806 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2807 if (set_statsn) 2808 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2809 else 2810 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2811 2812 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2813 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2814 hdr->datasn = cpu_to_be32(datain->data_sn); 2815 hdr->offset = cpu_to_be32(datain->offset); 2816 2817 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2818 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2819 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2820 ntohl(hdr->offset), datain->length, conn->cid); 2821 } 2822 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2823 2824 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2825 { 2826 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2827 struct iscsi_datain datain; 2828 struct iscsi_datain_req *dr; 2829 int eodr = 0, ret; 2830 bool set_statsn = false; 2831 2832 memset(&datain, 0, sizeof(struct iscsi_datain)); 2833 dr = iscsit_get_datain_values(cmd, &datain); 2834 if (!dr) { 2835 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2836 cmd->init_task_tag); 2837 return -1; 2838 } 2839 /* 2840 * Be paranoid and double check the logic for now. 2841 */ 2842 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2843 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2844 " datain.length: %u exceeds cmd->data_length: %u\n", 2845 cmd->init_task_tag, datain.offset, datain.length, 2846 cmd->se_cmd.data_length); 2847 return -1; 2848 } 2849 2850 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2851 /* 2852 * Special case for successfully execution w/ both DATAIN 2853 * and Sense Data. 2854 */ 2855 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2856 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2857 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2858 else { 2859 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2860 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2861 iscsit_increment_maxcmdsn(cmd, conn->sess); 2862 cmd->stat_sn = conn->stat_sn++; 2863 set_statsn = true; 2864 } else if (dr->dr_complete == 2865 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2866 set_statsn = true; 2867 } 2868 2869 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2870 2871 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2872 if (ret < 0) 2873 return ret; 2874 2875 if (dr->dr_complete) { 2876 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2877 2 : 1; 2878 iscsit_free_datain_req(cmd, dr); 2879 } 2880 2881 return eodr; 2882 } 2883 2884 int 2885 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2886 struct iscsi_logout_rsp *hdr) 2887 { 2888 struct iscsit_conn *logout_conn = NULL; 2889 struct iscsi_conn_recovery *cr = NULL; 2890 struct iscsit_session *sess = conn->sess; 2891 /* 2892 * The actual shutting down of Sessions and/or Connections 2893 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2894 * is done in scsi_logout_post_handler(). 2895 */ 2896 switch (cmd->logout_reason) { 2897 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2898 pr_debug("iSCSI session logout successful, setting" 2899 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2900 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2901 break; 2902 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2903 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2904 break; 2905 /* 2906 * For CLOSECONNECTION logout requests carrying 2907 * a matching logout CID -> local CID, the reference 2908 * for the local CID will have been incremented in 2909 * iscsi_logout_closeconnection(). 2910 * 2911 * For CLOSECONNECTION logout requests carrying 2912 * a different CID than the connection it arrived 2913 * on, the connection responding to cmd->logout_cid 2914 * is stopped in iscsit_logout_post_handler_diffcid(). 2915 */ 2916 2917 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2918 " successful.\n", cmd->logout_cid, conn->cid); 2919 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2920 break; 2921 case ISCSI_LOGOUT_REASON_RECOVERY: 2922 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2923 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2924 break; 2925 /* 2926 * If the connection is still active from our point of view 2927 * force connection recovery to occur. 2928 */ 2929 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2930 cmd->logout_cid); 2931 if (logout_conn) { 2932 iscsit_connection_reinstatement_rcfr(logout_conn); 2933 iscsit_dec_conn_usage_count(logout_conn); 2934 } 2935 2936 cr = iscsit_get_inactive_connection_recovery_entry( 2937 conn->sess, cmd->logout_cid); 2938 if (!cr) { 2939 pr_err("Unable to locate CID: %hu for" 2940 " REMOVECONNFORRECOVERY Logout Request.\n", 2941 cmd->logout_cid); 2942 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2943 break; 2944 } 2945 2946 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2947 2948 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2949 " for recovery for CID: %hu on CID: %hu successful.\n", 2950 cmd->logout_cid, conn->cid); 2951 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2952 break; 2953 default: 2954 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2955 cmd->logout_reason); 2956 return -1; 2957 } 2958 2959 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2960 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2961 hdr->response = cmd->logout_response; 2962 hdr->itt = cmd->init_task_tag; 2963 cmd->stat_sn = conn->stat_sn++; 2964 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2965 2966 iscsit_increment_maxcmdsn(cmd, conn->sess); 2967 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2968 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2969 2970 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2971 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2972 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2973 cmd->logout_cid, conn->cid); 2974 2975 return 0; 2976 } 2977 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2978 2979 static int 2980 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2981 { 2982 int rc; 2983 2984 rc = iscsit_build_logout_rsp(cmd, conn, 2985 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2986 if (rc < 0) 2987 return rc; 2988 2989 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2990 } 2991 2992 void 2993 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2994 struct iscsi_nopin *hdr, bool nopout_response) 2995 { 2996 hdr->opcode = ISCSI_OP_NOOP_IN; 2997 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2998 hton24(hdr->dlength, cmd->buf_ptr_size); 2999 if (nopout_response) 3000 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 3001 hdr->itt = cmd->init_task_tag; 3002 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3003 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 3004 conn->stat_sn; 3005 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3006 3007 if (nopout_response) 3008 iscsit_increment_maxcmdsn(cmd, conn->sess); 3009 3010 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3011 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3012 3013 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3014 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3015 "Solicited" : "Unsolicited", cmd->init_task_tag, 3016 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3017 } 3018 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3019 3020 /* 3021 * Unsolicited NOPIN, either requesting a response or not. 3022 */ 3023 static int iscsit_send_unsolicited_nopin( 3024 struct iscsit_cmd *cmd, 3025 struct iscsit_conn *conn, 3026 int want_response) 3027 { 3028 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3029 int ret; 3030 3031 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3032 3033 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3034 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3035 3036 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3037 if (ret < 0) 3038 return ret; 3039 3040 spin_lock_bh(&cmd->istate_lock); 3041 cmd->i_state = want_response ? 3042 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3043 spin_unlock_bh(&cmd->istate_lock); 3044 3045 return 0; 3046 } 3047 3048 static int 3049 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3050 { 3051 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3052 3053 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3054 3055 /* 3056 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr. 3057 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size. 3058 */ 3059 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3060 3061 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3062 cmd->buf_ptr, 3063 cmd->buf_ptr_size); 3064 } 3065 3066 static int iscsit_send_r2t( 3067 struct iscsit_cmd *cmd, 3068 struct iscsit_conn *conn) 3069 { 3070 struct iscsi_r2t *r2t; 3071 struct iscsi_r2t_rsp *hdr; 3072 int ret; 3073 3074 r2t = iscsit_get_r2t_from_list(cmd); 3075 if (!r2t) 3076 return -1; 3077 3078 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3079 memset(hdr, 0, ISCSI_HDR_LEN); 3080 hdr->opcode = ISCSI_OP_R2T; 3081 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3082 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3083 (struct scsi_lun *)&hdr->lun); 3084 hdr->itt = cmd->init_task_tag; 3085 if (conn->conn_transport->iscsit_get_r2t_ttt) 3086 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3087 else 3088 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3089 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3090 hdr->statsn = cpu_to_be32(conn->stat_sn); 3091 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3092 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3093 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3094 hdr->data_offset = cpu_to_be32(r2t->offset); 3095 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3096 3097 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3098 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3099 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3100 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3101 r2t->offset, r2t->xfer_len, conn->cid); 3102 3103 spin_lock_bh(&cmd->r2t_lock); 3104 r2t->sent_r2t = 1; 3105 spin_unlock_bh(&cmd->r2t_lock); 3106 3107 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3108 if (ret < 0) { 3109 return ret; 3110 } 3111 3112 spin_lock_bh(&cmd->dataout_timeout_lock); 3113 iscsit_start_dataout_timer(cmd, conn); 3114 spin_unlock_bh(&cmd->dataout_timeout_lock); 3115 3116 return 0; 3117 } 3118 3119 /* 3120 * @recovery: If called from iscsi_task_reassign_complete_write() for 3121 * connection recovery. 3122 */ 3123 int iscsit_build_r2ts_for_cmd( 3124 struct iscsit_conn *conn, 3125 struct iscsit_cmd *cmd, 3126 bool recovery) 3127 { 3128 int first_r2t = 1; 3129 u32 offset = 0, xfer_len = 0; 3130 3131 spin_lock_bh(&cmd->r2t_lock); 3132 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3133 spin_unlock_bh(&cmd->r2t_lock); 3134 return 0; 3135 } 3136 3137 if (conn->sess->sess_ops->DataSequenceInOrder && 3138 !recovery) 3139 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3140 3141 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3142 if (conn->sess->sess_ops->DataSequenceInOrder) { 3143 offset = cmd->r2t_offset; 3144 3145 if (first_r2t && recovery) { 3146 int new_data_end = offset + 3147 conn->sess->sess_ops->MaxBurstLength - 3148 cmd->next_burst_len; 3149 3150 if (new_data_end > cmd->se_cmd.data_length) 3151 xfer_len = cmd->se_cmd.data_length - offset; 3152 else 3153 xfer_len = 3154 conn->sess->sess_ops->MaxBurstLength - 3155 cmd->next_burst_len; 3156 } else { 3157 int new_data_end = offset + 3158 conn->sess->sess_ops->MaxBurstLength; 3159 3160 if (new_data_end > cmd->se_cmd.data_length) 3161 xfer_len = cmd->se_cmd.data_length - offset; 3162 else 3163 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3164 } 3165 3166 if ((s32)xfer_len < 0) { 3167 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3168 break; 3169 } 3170 3171 cmd->r2t_offset += xfer_len; 3172 3173 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3174 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3175 } else { 3176 struct iscsi_seq *seq; 3177 3178 seq = iscsit_get_seq_holder_for_r2t(cmd); 3179 if (!seq) { 3180 spin_unlock_bh(&cmd->r2t_lock); 3181 return -1; 3182 } 3183 3184 offset = seq->offset; 3185 xfer_len = seq->xfer_len; 3186 3187 if (cmd->seq_send_order == cmd->seq_count) 3188 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3189 } 3190 cmd->outstanding_r2ts++; 3191 first_r2t = 0; 3192 3193 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3194 spin_unlock_bh(&cmd->r2t_lock); 3195 return -1; 3196 } 3197 3198 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3199 break; 3200 } 3201 spin_unlock_bh(&cmd->r2t_lock); 3202 3203 return 0; 3204 } 3205 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3206 3207 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3208 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3209 { 3210 if (inc_stat_sn) 3211 cmd->stat_sn = conn->stat_sn++; 3212 3213 atomic_long_inc(&conn->sess->rsp_pdus); 3214 3215 memset(hdr, 0, ISCSI_HDR_LEN); 3216 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3217 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3218 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3219 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3220 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3221 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3222 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3223 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3224 } 3225 hdr->response = cmd->iscsi_response; 3226 hdr->cmd_status = cmd->se_cmd.scsi_status; 3227 hdr->itt = cmd->init_task_tag; 3228 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3229 3230 iscsit_increment_maxcmdsn(cmd, conn->sess); 3231 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3232 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3233 3234 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3235 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3236 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3237 cmd->se_cmd.scsi_status, conn->cid); 3238 } 3239 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3240 3241 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3242 { 3243 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3244 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3245 void *data_buf = NULL; 3246 u32 padding = 0, data_buf_len = 0; 3247 3248 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3249 3250 /* 3251 * Attach SENSE DATA payload to iSCSI Response PDU 3252 */ 3253 if (cmd->se_cmd.sense_buffer && 3254 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3255 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3256 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3257 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3258 3259 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3260 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3261 data_buf = cmd->sense_buffer; 3262 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3263 3264 if (padding) { 3265 memset(cmd->sense_buffer + 3266 cmd->se_cmd.scsi_sense_length, 0, padding); 3267 pr_debug("Adding %u bytes of padding to" 3268 " SENSE.\n", padding); 3269 } 3270 3271 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3272 " Response PDU\n", 3273 cmd->se_cmd.scsi_sense_length); 3274 } 3275 3276 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3277 data_buf_len); 3278 } 3279 3280 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3281 { 3282 switch (se_tmr->response) { 3283 case TMR_FUNCTION_COMPLETE: 3284 return ISCSI_TMF_RSP_COMPLETE; 3285 case TMR_TASK_DOES_NOT_EXIST: 3286 return ISCSI_TMF_RSP_NO_TASK; 3287 case TMR_LUN_DOES_NOT_EXIST: 3288 return ISCSI_TMF_RSP_NO_LUN; 3289 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3290 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3291 case TMR_FUNCTION_REJECTED: 3292 default: 3293 return ISCSI_TMF_RSP_REJECTED; 3294 } 3295 } 3296 3297 void 3298 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3299 struct iscsi_tm_rsp *hdr) 3300 { 3301 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3302 3303 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3304 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3305 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3306 hdr->itt = cmd->init_task_tag; 3307 cmd->stat_sn = conn->stat_sn++; 3308 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3309 3310 iscsit_increment_maxcmdsn(cmd, conn->sess); 3311 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3312 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3313 3314 pr_debug("Built Task Management Response ITT: 0x%08x," 3315 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3316 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3317 } 3318 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3319 3320 static int 3321 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3322 { 3323 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3324 3325 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3326 3327 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3328 } 3329 3330 #define SENDTARGETS_BUF_LIMIT 32768U 3331 3332 static int 3333 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd, 3334 enum iscsit_transport_type network_transport, 3335 int skip_bytes, bool *completed) 3336 { 3337 char *payload = NULL; 3338 struct iscsit_conn *conn = cmd->conn; 3339 struct iscsi_portal_group *tpg; 3340 struct iscsi_tiqn *tiqn; 3341 struct iscsi_tpg_np *tpg_np; 3342 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3343 int target_name_printed; 3344 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3345 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3346 bool active; 3347 3348 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3349 SENDTARGETS_BUF_LIMIT); 3350 3351 payload = kzalloc(buffer_len, GFP_KERNEL); 3352 if (!payload) 3353 return -ENOMEM; 3354 3355 /* 3356 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3357 * explicit case.. 3358 */ 3359 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3360 text_ptr = strchr(text_in, '='); 3361 if (!text_ptr) { 3362 pr_err("Unable to locate '=' string in text_in:" 3363 " %s\n", text_in); 3364 kfree(payload); 3365 return -EINVAL; 3366 } 3367 /* 3368 * Skip over '=' character.. 3369 */ 3370 text_ptr += 1; 3371 } 3372 3373 spin_lock(&tiqn_lock); 3374 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3375 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3376 strcmp(tiqn->tiqn, text_ptr)) { 3377 continue; 3378 } 3379 3380 target_name_printed = 0; 3381 3382 spin_lock(&tiqn->tiqn_tpg_lock); 3383 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3384 3385 /* If demo_mode_discovery=0 and generate_node_acls=0 3386 * (demo mode dislabed) do not return 3387 * TargetName+TargetAddress unless a NodeACL exists. 3388 */ 3389 3390 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3391 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3392 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3393 cmd->conn->sess->sess_ops->InitiatorName))) { 3394 continue; 3395 } 3396 3397 spin_lock(&tpg->tpg_state_lock); 3398 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3399 spin_unlock(&tpg->tpg_state_lock); 3400 3401 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3402 continue; 3403 3404 spin_lock(&tpg->tpg_np_lock); 3405 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3406 tpg_np_list) { 3407 struct iscsi_np *np = tpg_np->tpg_np; 3408 struct sockaddr_storage *sockaddr; 3409 3410 if (np->np_network_transport != network_transport) 3411 continue; 3412 3413 if (!target_name_printed) { 3414 len = sprintf(buf, "TargetName=%s", 3415 tiqn->tiqn); 3416 len += 1; 3417 3418 if ((len + payload_len) > buffer_len) { 3419 spin_unlock(&tpg->tpg_np_lock); 3420 spin_unlock(&tiqn->tiqn_tpg_lock); 3421 end_of_buf = 1; 3422 goto eob; 3423 } 3424 3425 if (skip_bytes && len <= skip_bytes) { 3426 skip_bytes -= len; 3427 } else { 3428 memcpy(payload + payload_len, buf, len); 3429 payload_len += len; 3430 target_name_printed = 1; 3431 if (len > skip_bytes) 3432 skip_bytes = 0; 3433 } 3434 } 3435 3436 if (inet_addr_is_any(&np->np_sockaddr)) 3437 sockaddr = &conn->local_sockaddr; 3438 else 3439 sockaddr = &np->np_sockaddr; 3440 3441 len = sprintf(buf, "TargetAddress=" 3442 "%pISpc,%hu", 3443 sockaddr, 3444 tpg->tpgt); 3445 len += 1; 3446 3447 if ((len + payload_len) > buffer_len) { 3448 spin_unlock(&tpg->tpg_np_lock); 3449 spin_unlock(&tiqn->tiqn_tpg_lock); 3450 end_of_buf = 1; 3451 goto eob; 3452 } 3453 3454 if (skip_bytes && len <= skip_bytes) { 3455 skip_bytes -= len; 3456 } else { 3457 memcpy(payload + payload_len, buf, len); 3458 payload_len += len; 3459 if (len > skip_bytes) 3460 skip_bytes = 0; 3461 } 3462 } 3463 spin_unlock(&tpg->tpg_np_lock); 3464 } 3465 spin_unlock(&tiqn->tiqn_tpg_lock); 3466 eob: 3467 if (end_of_buf) { 3468 *completed = false; 3469 break; 3470 } 3471 3472 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3473 break; 3474 } 3475 spin_unlock(&tiqn_lock); 3476 3477 cmd->buf_ptr = payload; 3478 3479 return payload_len; 3480 } 3481 3482 int 3483 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3484 struct iscsi_text_rsp *hdr, 3485 enum iscsit_transport_type network_transport) 3486 { 3487 int text_length, padding; 3488 bool completed = true; 3489 3490 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3491 cmd->read_data_done, 3492 &completed); 3493 if (text_length < 0) 3494 return text_length; 3495 3496 if (completed) { 3497 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3498 } else { 3499 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3500 cmd->read_data_done += text_length; 3501 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3502 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3503 } 3504 hdr->opcode = ISCSI_OP_TEXT_RSP; 3505 padding = ((-text_length) & 3); 3506 hton24(hdr->dlength, text_length); 3507 hdr->itt = cmd->init_task_tag; 3508 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3509 cmd->stat_sn = conn->stat_sn++; 3510 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3511 3512 iscsit_increment_maxcmdsn(cmd, conn->sess); 3513 /* 3514 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3515 * correctly increment MaxCmdSN for each response answering a 3516 * non immediate text request with a valid CmdSN. 3517 */ 3518 cmd->maxcmdsn_inc = 0; 3519 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3520 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3521 3522 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3523 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3524 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3525 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3526 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3527 3528 return text_length + padding; 3529 } 3530 EXPORT_SYMBOL(iscsit_build_text_rsp); 3531 3532 static int iscsit_send_text_rsp( 3533 struct iscsit_cmd *cmd, 3534 struct iscsit_conn *conn) 3535 { 3536 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3537 int text_length; 3538 3539 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3540 conn->conn_transport->transport_type); 3541 if (text_length < 0) 3542 return text_length; 3543 3544 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3545 cmd->buf_ptr, 3546 text_length); 3547 } 3548 3549 void 3550 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3551 struct iscsi_reject *hdr) 3552 { 3553 hdr->opcode = ISCSI_OP_REJECT; 3554 hdr->reason = cmd->reject_reason; 3555 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3556 hton24(hdr->dlength, ISCSI_HDR_LEN); 3557 hdr->ffffffff = cpu_to_be32(0xffffffff); 3558 cmd->stat_sn = conn->stat_sn++; 3559 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3560 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3561 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3562 3563 } 3564 EXPORT_SYMBOL(iscsit_build_reject); 3565 3566 static int iscsit_send_reject( 3567 struct iscsit_cmd *cmd, 3568 struct iscsit_conn *conn) 3569 { 3570 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3571 3572 iscsit_build_reject(cmd, conn, hdr); 3573 3574 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3575 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3576 3577 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3578 cmd->buf_ptr, 3579 ISCSI_HDR_LEN); 3580 } 3581 3582 void iscsit_thread_get_cpumask(struct iscsit_conn *conn) 3583 { 3584 int ord, cpu; 3585 cpumask_var_t conn_allowed_cpumask; 3586 3587 /* 3588 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3589 * within iscsit_start_kthreads() 3590 * 3591 * Here we use bitmap_id to determine which CPU that this 3592 * iSCSI connection's RX/TX threads will be scheduled to 3593 * execute upon. 3594 */ 3595 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) { 3596 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3597 for_each_online_cpu(cpu) { 3598 if (ord-- == 0) { 3599 cpumask_set_cpu(cpu, conn->conn_cpumask); 3600 return; 3601 } 3602 } 3603 } else { 3604 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask, 3605 cpu_online_mask); 3606 3607 cpumask_clear(conn->conn_cpumask); 3608 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask); 3609 for_each_cpu(cpu, conn_allowed_cpumask) { 3610 if (ord-- == 0) { 3611 cpumask_set_cpu(cpu, conn->conn_cpumask); 3612 free_cpumask_var(conn_allowed_cpumask); 3613 return; 3614 } 3615 } 3616 free_cpumask_var(conn_allowed_cpumask); 3617 } 3618 /* 3619 * This should never be reached.. 3620 */ 3621 dump_stack(); 3622 cpumask_setall(conn->conn_cpumask); 3623 } 3624 3625 static void iscsit_thread_reschedule(struct iscsit_conn *conn) 3626 { 3627 /* 3628 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI 3629 * connection's RX/TX threads update conn->allowed_cpumask. 3630 */ 3631 if (!cpumask_equal(iscsit_global->allowed_cpumask, 3632 conn->allowed_cpumask)) { 3633 iscsit_thread_get_cpumask(conn); 3634 conn->conn_tx_reset_cpumask = 1; 3635 conn->conn_rx_reset_cpumask = 1; 3636 cpumask_copy(conn->allowed_cpumask, 3637 iscsit_global->allowed_cpumask); 3638 } 3639 } 3640 3641 void iscsit_thread_check_cpumask( 3642 struct iscsit_conn *conn, 3643 struct task_struct *p, 3644 int mode) 3645 { 3646 /* 3647 * The TX and RX threads maybe call iscsit_thread_check_cpumask() 3648 * at the same time. The RX thread might be faster and return from 3649 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0. 3650 * Then the TX thread sets it back to 1. 3651 * The next time the RX thread loops, it sees conn_rx_reset_cpumask 3652 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0. 3653 */ 3654 iscsit_thread_reschedule(conn); 3655 3656 /* 3657 * mode == 1 signals iscsi_target_tx_thread() usage. 3658 * mode == 0 signals iscsi_target_rx_thread() usage. 3659 */ 3660 if (mode == 1) { 3661 if (!conn->conn_tx_reset_cpumask) 3662 return; 3663 } else { 3664 if (!conn->conn_rx_reset_cpumask) 3665 return; 3666 } 3667 3668 /* 3669 * Update the CPU mask for this single kthread so that 3670 * both TX and RX kthreads are scheduled to run on the 3671 * same CPU. 3672 */ 3673 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3674 if (mode == 1) 3675 conn->conn_tx_reset_cpumask = 0; 3676 else 3677 conn->conn_rx_reset_cpumask = 0; 3678 } 3679 EXPORT_SYMBOL(iscsit_thread_check_cpumask); 3680 3681 int 3682 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3683 { 3684 int ret; 3685 3686 switch (state) { 3687 case ISTATE_SEND_R2T: 3688 ret = iscsit_send_r2t(cmd, conn); 3689 if (ret < 0) 3690 goto err; 3691 break; 3692 case ISTATE_REMOVE: 3693 spin_lock_bh(&conn->cmd_lock); 3694 list_del_init(&cmd->i_conn_node); 3695 spin_unlock_bh(&conn->cmd_lock); 3696 3697 iscsit_free_cmd(cmd, false); 3698 break; 3699 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3700 iscsit_mod_nopin_response_timer(conn); 3701 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3702 if (ret < 0) 3703 goto err; 3704 break; 3705 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3706 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3707 if (ret < 0) 3708 goto err; 3709 break; 3710 default: 3711 pr_err("Unknown Opcode: 0x%02x ITT:" 3712 " 0x%08x, i_state: %d on CID: %hu\n", 3713 cmd->iscsi_opcode, cmd->init_task_tag, state, 3714 conn->cid); 3715 goto err; 3716 } 3717 3718 return 0; 3719 3720 err: 3721 return -1; 3722 } 3723 EXPORT_SYMBOL(iscsit_immediate_queue); 3724 3725 static int 3726 iscsit_handle_immediate_queue(struct iscsit_conn *conn) 3727 { 3728 struct iscsit_transport *t = conn->conn_transport; 3729 struct iscsi_queue_req *qr; 3730 struct iscsit_cmd *cmd; 3731 u8 state; 3732 int ret; 3733 3734 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3735 atomic_set(&conn->check_immediate_queue, 0); 3736 cmd = qr->cmd; 3737 state = qr->state; 3738 kmem_cache_free(lio_qr_cache, qr); 3739 3740 ret = t->iscsit_immediate_queue(conn, cmd, state); 3741 if (ret < 0) 3742 return ret; 3743 } 3744 3745 return 0; 3746 } 3747 3748 int 3749 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3750 { 3751 int ret; 3752 3753 check_rsp_state: 3754 switch (state) { 3755 case ISTATE_SEND_DATAIN: 3756 ret = iscsit_send_datain(cmd, conn); 3757 if (ret < 0) 3758 goto err; 3759 else if (!ret) 3760 /* more drs */ 3761 goto check_rsp_state; 3762 else if (ret == 1) { 3763 /* all done */ 3764 spin_lock_bh(&cmd->istate_lock); 3765 cmd->i_state = ISTATE_SENT_STATUS; 3766 spin_unlock_bh(&cmd->istate_lock); 3767 3768 if (atomic_read(&conn->check_immediate_queue)) 3769 return 1; 3770 3771 return 0; 3772 } else if (ret == 2) { 3773 /* Still must send status, 3774 SCF_TRANSPORT_TASK_SENSE was set */ 3775 spin_lock_bh(&cmd->istate_lock); 3776 cmd->i_state = ISTATE_SEND_STATUS; 3777 spin_unlock_bh(&cmd->istate_lock); 3778 state = ISTATE_SEND_STATUS; 3779 goto check_rsp_state; 3780 } 3781 3782 break; 3783 case ISTATE_SEND_STATUS: 3784 case ISTATE_SEND_STATUS_RECOVERY: 3785 ret = iscsit_send_response(cmd, conn); 3786 break; 3787 case ISTATE_SEND_LOGOUTRSP: 3788 ret = iscsit_send_logout(cmd, conn); 3789 break; 3790 case ISTATE_SEND_ASYNCMSG: 3791 ret = iscsit_send_conn_drop_async_message( 3792 cmd, conn); 3793 break; 3794 case ISTATE_SEND_NOPIN: 3795 ret = iscsit_send_nopin(cmd, conn); 3796 break; 3797 case ISTATE_SEND_REJECT: 3798 ret = iscsit_send_reject(cmd, conn); 3799 break; 3800 case ISTATE_SEND_TASKMGTRSP: 3801 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3802 if (ret != 0) 3803 break; 3804 ret = iscsit_tmr_post_handler(cmd, conn); 3805 if (ret != 0) 3806 iscsit_fall_back_to_erl0(conn->sess); 3807 break; 3808 case ISTATE_SEND_TEXTRSP: 3809 ret = iscsit_send_text_rsp(cmd, conn); 3810 break; 3811 default: 3812 pr_err("Unknown Opcode: 0x%02x ITT:" 3813 " 0x%08x, i_state: %d on CID: %hu\n", 3814 cmd->iscsi_opcode, cmd->init_task_tag, 3815 state, conn->cid); 3816 goto err; 3817 } 3818 if (ret < 0) 3819 goto err; 3820 3821 switch (state) { 3822 case ISTATE_SEND_LOGOUTRSP: 3823 if (!iscsit_logout_post_handler(cmd, conn)) 3824 return -ECONNRESET; 3825 fallthrough; 3826 case ISTATE_SEND_STATUS: 3827 case ISTATE_SEND_ASYNCMSG: 3828 case ISTATE_SEND_NOPIN: 3829 case ISTATE_SEND_STATUS_RECOVERY: 3830 case ISTATE_SEND_TEXTRSP: 3831 case ISTATE_SEND_TASKMGTRSP: 3832 case ISTATE_SEND_REJECT: 3833 spin_lock_bh(&cmd->istate_lock); 3834 cmd->i_state = ISTATE_SENT_STATUS; 3835 spin_unlock_bh(&cmd->istate_lock); 3836 break; 3837 default: 3838 pr_err("Unknown Opcode: 0x%02x ITT:" 3839 " 0x%08x, i_state: %d on CID: %hu\n", 3840 cmd->iscsi_opcode, cmd->init_task_tag, 3841 cmd->i_state, conn->cid); 3842 goto err; 3843 } 3844 3845 if (atomic_read(&conn->check_immediate_queue)) 3846 return 1; 3847 3848 return 0; 3849 3850 err: 3851 return -1; 3852 } 3853 EXPORT_SYMBOL(iscsit_response_queue); 3854 3855 static int iscsit_handle_response_queue(struct iscsit_conn *conn) 3856 { 3857 struct iscsit_transport *t = conn->conn_transport; 3858 struct iscsi_queue_req *qr; 3859 struct iscsit_cmd *cmd; 3860 u8 state; 3861 int ret; 3862 3863 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3864 cmd = qr->cmd; 3865 state = qr->state; 3866 kmem_cache_free(lio_qr_cache, qr); 3867 3868 ret = t->iscsit_response_queue(conn, cmd, state); 3869 if (ret == 1 || ret < 0) 3870 return ret; 3871 } 3872 3873 return 0; 3874 } 3875 3876 int iscsi_target_tx_thread(void *arg) 3877 { 3878 int ret = 0; 3879 struct iscsit_conn *conn = arg; 3880 bool conn_freed = false; 3881 3882 /* 3883 * Allow ourselves to be interrupted by SIGINT so that a 3884 * connection recovery / failure event can be triggered externally. 3885 */ 3886 allow_signal(SIGINT); 3887 3888 while (!kthread_should_stop()) { 3889 /* 3890 * Ensure that both TX and RX per connection kthreads 3891 * are scheduled to run on the same CPU. 3892 */ 3893 iscsit_thread_check_cpumask(conn, current, 1); 3894 3895 wait_event_interruptible(conn->queues_wq, 3896 !iscsit_conn_all_queues_empty(conn)); 3897 3898 if (signal_pending(current)) 3899 goto transport_err; 3900 3901 get_immediate: 3902 ret = iscsit_handle_immediate_queue(conn); 3903 if (ret < 0) 3904 goto transport_err; 3905 3906 ret = iscsit_handle_response_queue(conn); 3907 if (ret == 1) { 3908 goto get_immediate; 3909 } else if (ret == -ECONNRESET) { 3910 conn_freed = true; 3911 goto out; 3912 } else if (ret < 0) { 3913 goto transport_err; 3914 } 3915 } 3916 3917 transport_err: 3918 /* 3919 * Avoid the normal connection failure code-path if this connection 3920 * is still within LOGIN mode, and iscsi_np process context is 3921 * responsible for cleaning up the early connection failure. 3922 */ 3923 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3924 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3925 out: 3926 if (!conn_freed) { 3927 while (!kthread_should_stop()) { 3928 msleep(100); 3929 } 3930 } 3931 return 0; 3932 } 3933 3934 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf) 3935 { 3936 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3937 struct iscsit_cmd *cmd; 3938 int ret = 0; 3939 3940 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3941 case ISCSI_OP_SCSI_CMD: 3942 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3943 if (!cmd) 3944 goto reject; 3945 3946 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3947 break; 3948 case ISCSI_OP_SCSI_DATA_OUT: 3949 ret = iscsit_handle_data_out(conn, buf); 3950 break; 3951 case ISCSI_OP_NOOP_OUT: 3952 cmd = NULL; 3953 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3954 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3955 if (!cmd) 3956 goto reject; 3957 } 3958 ret = iscsit_handle_nop_out(conn, cmd, buf); 3959 break; 3960 case ISCSI_OP_SCSI_TMFUNC: 3961 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3962 if (!cmd) 3963 goto reject; 3964 3965 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3966 break; 3967 case ISCSI_OP_TEXT: 3968 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3969 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3970 if (!cmd) 3971 goto reject; 3972 } else { 3973 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3974 if (!cmd) 3975 goto reject; 3976 } 3977 3978 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3979 break; 3980 case ISCSI_OP_LOGOUT: 3981 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3982 if (!cmd) 3983 goto reject; 3984 3985 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3986 if (ret > 0) 3987 wait_for_completion_timeout(&conn->conn_logout_comp, 3988 SECONDS_FOR_LOGOUT_COMP * HZ); 3989 break; 3990 case ISCSI_OP_SNACK: 3991 ret = iscsit_handle_snack(conn, buf); 3992 break; 3993 default: 3994 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3995 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3996 pr_err("Cannot recover from unknown" 3997 " opcode while ERL=0, closing iSCSI connection.\n"); 3998 return -1; 3999 } 4000 pr_err("Unable to recover from unknown opcode while OFMarker=No," 4001 " closing iSCSI connection.\n"); 4002 ret = -1; 4003 break; 4004 } 4005 4006 return ret; 4007 reject: 4008 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4009 } 4010 4011 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn) 4012 { 4013 bool ret; 4014 4015 spin_lock_bh(&conn->state_lock); 4016 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 4017 spin_unlock_bh(&conn->state_lock); 4018 4019 return ret; 4020 } 4021 4022 static void iscsit_get_rx_pdu(struct iscsit_conn *conn) 4023 { 4024 int ret; 4025 u8 *buffer, *tmp_buf, opcode; 4026 u32 checksum = 0, digest = 0; 4027 struct iscsi_hdr *hdr; 4028 struct kvec iov; 4029 4030 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 4031 if (!buffer) 4032 return; 4033 4034 while (!kthread_should_stop()) { 4035 /* 4036 * Ensure that both TX and RX per connection kthreads 4037 * are scheduled to run on the same CPU. 4038 */ 4039 iscsit_thread_check_cpumask(conn, current, 0); 4040 4041 memset(&iov, 0, sizeof(struct kvec)); 4042 4043 iov.iov_base = buffer; 4044 iov.iov_len = ISCSI_HDR_LEN; 4045 4046 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4047 if (ret != ISCSI_HDR_LEN) { 4048 iscsit_rx_thread_wait_for_tcp(conn); 4049 break; 4050 } 4051 4052 hdr = (struct iscsi_hdr *) buffer; 4053 if (hdr->hlength) { 4054 iov.iov_len = hdr->hlength * 4; 4055 tmp_buf = krealloc(buffer, 4056 ISCSI_HDR_LEN + iov.iov_len, 4057 GFP_KERNEL); 4058 if (!tmp_buf) 4059 break; 4060 4061 buffer = tmp_buf; 4062 iov.iov_base = &buffer[ISCSI_HDR_LEN]; 4063 4064 ret = rx_data(conn, &iov, 1, iov.iov_len); 4065 if (ret != iov.iov_len) { 4066 iscsit_rx_thread_wait_for_tcp(conn); 4067 break; 4068 } 4069 } 4070 4071 if (conn->conn_ops->HeaderDigest) { 4072 iov.iov_base = &digest; 4073 iov.iov_len = ISCSI_CRC_LEN; 4074 4075 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4076 if (ret != ISCSI_CRC_LEN) { 4077 iscsit_rx_thread_wait_for_tcp(conn); 4078 break; 4079 } 4080 4081 checksum = iscsit_crc_buf(buffer, ISCSI_HDR_LEN, 0, 4082 NULL); 4083 if (digest != checksum) { 4084 pr_err("HeaderDigest CRC32C failed," 4085 " received 0x%08x, computed 0x%08x\n", 4086 digest, checksum); 4087 /* 4088 * Set the PDU to 0xff so it will intentionally 4089 * hit default in the switch below. 4090 */ 4091 memset(buffer, 0xff, ISCSI_HDR_LEN); 4092 atomic_long_inc(&conn->sess->conn_digest_errors); 4093 } else { 4094 pr_debug("Got HeaderDigest CRC32C" 4095 " 0x%08x\n", checksum); 4096 } 4097 } 4098 4099 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4100 break; 4101 4102 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4103 4104 if (conn->sess->sess_ops->SessionType && 4105 ((!(opcode & ISCSI_OP_TEXT)) || 4106 (!(opcode & ISCSI_OP_LOGOUT)))) { 4107 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4108 " while in Discovery Session, rejecting.\n", opcode); 4109 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4110 buffer); 4111 break; 4112 } 4113 4114 ret = iscsi_target_rx_opcode(conn, buffer); 4115 if (ret < 0) 4116 break; 4117 } 4118 4119 kfree(buffer); 4120 } 4121 4122 int iscsi_target_rx_thread(void *arg) 4123 { 4124 int rc; 4125 struct iscsit_conn *conn = arg; 4126 bool conn_freed = false; 4127 4128 /* 4129 * Allow ourselves to be interrupted by SIGINT so that a 4130 * connection recovery / failure event can be triggered externally. 4131 */ 4132 allow_signal(SIGINT); 4133 /* 4134 * Wait for iscsi_post_login_handler() to complete before allowing 4135 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4136 */ 4137 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4138 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4139 goto out; 4140 4141 if (!conn->conn_transport->iscsit_get_rx_pdu) 4142 return 0; 4143 4144 conn->conn_transport->iscsit_get_rx_pdu(conn); 4145 4146 if (!signal_pending(current)) 4147 atomic_set(&conn->transport_failed, 1); 4148 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4149 4150 out: 4151 if (!conn_freed) { 4152 while (!kthread_should_stop()) { 4153 msleep(100); 4154 } 4155 } 4156 4157 return 0; 4158 } 4159 4160 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn) 4161 { 4162 LIST_HEAD(tmp_list); 4163 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL; 4164 struct iscsit_session *sess = conn->sess; 4165 /* 4166 * We expect this function to only ever be called from either RX or TX 4167 * thread context via iscsit_close_connection() once the other context 4168 * has been reset -> returned sleeping pre-handler state. 4169 */ 4170 spin_lock_bh(&conn->cmd_lock); 4171 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4172 4173 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4174 struct se_cmd *se_cmd = &cmd->se_cmd; 4175 4176 if (!se_cmd->se_tfo) 4177 continue; 4178 4179 spin_lock_irq(&se_cmd->t_state_lock); 4180 if (se_cmd->transport_state & CMD_T_ABORTED) { 4181 if (!(se_cmd->transport_state & CMD_T_TAS)) 4182 /* 4183 * LIO's abort path owns the cleanup for this, 4184 * so put it back on the list and let 4185 * aborted_task handle it. 4186 */ 4187 list_move_tail(&cmd->i_conn_node, 4188 &conn->conn_cmd_list); 4189 } else { 4190 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4191 } 4192 4193 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 4194 /* 4195 * We never submitted the cmd to LIO core, so we have 4196 * to tell LIO to perform the completion process. 4197 */ 4198 spin_unlock_irq(&se_cmd->t_state_lock); 4199 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED); 4200 continue; 4201 } 4202 spin_unlock_irq(&se_cmd->t_state_lock); 4203 } 4204 spin_unlock_bh(&conn->cmd_lock); 4205 4206 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4207 list_del_init(&cmd->i_conn_node); 4208 4209 iscsit_increment_maxcmdsn(cmd, sess); 4210 iscsit_free_cmd(cmd, true); 4211 4212 } 4213 4214 /* 4215 * Wait on commands that were cleaned up via the aborted_task path. 4216 * LLDs that implement iscsit_wait_conn will already have waited for 4217 * commands. 4218 */ 4219 if (!conn->conn_transport->iscsit_wait_conn) { 4220 target_stop_cmd_counter(conn->cmd_cnt); 4221 target_wait_for_cmds(conn->cmd_cnt); 4222 } 4223 } 4224 4225 static void iscsit_stop_timers_for_cmds( 4226 struct iscsit_conn *conn) 4227 { 4228 struct iscsit_cmd *cmd; 4229 4230 spin_lock_bh(&conn->cmd_lock); 4231 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4232 if (cmd->data_direction == DMA_TO_DEVICE) 4233 iscsit_stop_dataout_timer(cmd); 4234 } 4235 spin_unlock_bh(&conn->cmd_lock); 4236 } 4237 4238 int iscsit_close_connection( 4239 struct iscsit_conn *conn) 4240 { 4241 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4242 struct iscsit_session *sess = conn->sess; 4243 4244 pr_debug("Closing iSCSI connection CID %hu on SID:" 4245 " %u\n", conn->cid, sess->sid); 4246 /* 4247 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4248 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4249 * sleeping and the logout response never got sent because the 4250 * connection failed. 4251 * 4252 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4253 * to signal logout response TX interrupt completion. Go ahead and skip 4254 * this for iser since isert_rx_opcode() does not wait on logout failure, 4255 * and to avoid iscsit_conn pointer dereference in iser-target code. 4256 */ 4257 if (!conn->conn_transport->rdma_shutdown) 4258 complete(&conn->conn_logout_comp); 4259 4260 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4261 if (conn->tx_thread && 4262 cmpxchg(&conn->tx_thread_active, true, false)) { 4263 send_sig(SIGINT, conn->tx_thread, 1); 4264 kthread_stop(conn->tx_thread); 4265 } 4266 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4267 if (conn->rx_thread && 4268 cmpxchg(&conn->rx_thread_active, true, false)) { 4269 send_sig(SIGINT, conn->rx_thread, 1); 4270 kthread_stop(conn->rx_thread); 4271 } 4272 } 4273 4274 spin_lock(&iscsit_global->ts_bitmap_lock); 4275 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4276 get_order(1)); 4277 spin_unlock(&iscsit_global->ts_bitmap_lock); 4278 4279 iscsit_stop_timers_for_cmds(conn); 4280 iscsit_stop_nopin_timer(conn); 4281 iscsit_stop_nopin_response_timer(conn); 4282 4283 if (conn->conn_transport->iscsit_wait_conn) 4284 conn->conn_transport->iscsit_wait_conn(conn); 4285 4286 /* 4287 * During Connection recovery drop unacknowledged out of order 4288 * commands for this connection, and prepare the other commands 4289 * for reallegiance. 4290 * 4291 * During normal operation clear the out of order commands (but 4292 * do not free the struct iscsi_ooo_cmdsn's) and release all 4293 * struct iscsit_cmds. 4294 */ 4295 if (atomic_read(&conn->connection_recovery)) { 4296 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4297 iscsit_prepare_cmds_for_reallegiance(conn); 4298 } else { 4299 iscsit_clear_ooo_cmdsns_for_conn(conn); 4300 iscsit_release_commands_from_conn(conn); 4301 } 4302 iscsit_free_queue_reqs_for_conn(conn); 4303 4304 /* 4305 * Handle decrementing session or connection usage count if 4306 * a logout response was not able to be sent because the 4307 * connection failed. Fall back to Session Recovery here. 4308 */ 4309 if (atomic_read(&conn->conn_logout_remove)) { 4310 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4311 iscsit_dec_conn_usage_count(conn); 4312 iscsit_dec_session_usage_count(sess); 4313 } 4314 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4315 iscsit_dec_conn_usage_count(conn); 4316 4317 atomic_set(&conn->conn_logout_remove, 0); 4318 atomic_set(&sess->session_reinstatement, 0); 4319 atomic_set(&sess->session_fall_back_to_erl0, 1); 4320 } 4321 4322 spin_lock_bh(&sess->conn_lock); 4323 list_del(&conn->conn_list); 4324 4325 /* 4326 * Attempt to let the Initiator know this connection failed by 4327 * sending an Connection Dropped Async Message on another 4328 * active connection. 4329 */ 4330 if (atomic_read(&conn->connection_recovery)) 4331 iscsit_build_conn_drop_async_message(conn); 4332 4333 spin_unlock_bh(&sess->conn_lock); 4334 4335 /* 4336 * If connection reinstatement is being performed on this connection, 4337 * up the connection reinstatement semaphore that is being blocked on 4338 * in iscsit_cause_connection_reinstatement(). 4339 */ 4340 spin_lock_bh(&conn->state_lock); 4341 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4342 spin_unlock_bh(&conn->state_lock); 4343 complete(&conn->conn_wait_comp); 4344 wait_for_completion(&conn->conn_post_wait_comp); 4345 spin_lock_bh(&conn->state_lock); 4346 } 4347 4348 /* 4349 * If connection reinstatement is being performed on this connection 4350 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4351 * connection wait rcfr semaphore that is being blocked on 4352 * an iscsit_connection_reinstatement_rcfr(). 4353 */ 4354 if (atomic_read(&conn->connection_wait_rcfr)) { 4355 spin_unlock_bh(&conn->state_lock); 4356 complete(&conn->conn_wait_rcfr_comp); 4357 wait_for_completion(&conn->conn_post_wait_comp); 4358 spin_lock_bh(&conn->state_lock); 4359 } 4360 atomic_set(&conn->connection_reinstatement, 1); 4361 spin_unlock_bh(&conn->state_lock); 4362 4363 /* 4364 * If any other processes are accessing this connection pointer we 4365 * must wait until they have completed. 4366 */ 4367 iscsit_check_conn_usage_count(conn); 4368 4369 if (conn->sock) 4370 sock_release(conn->sock); 4371 4372 if (conn->conn_transport->iscsit_free_conn) 4373 conn->conn_transport->iscsit_free_conn(conn); 4374 4375 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4376 conn->conn_state = TARG_CONN_STATE_FREE; 4377 iscsit_free_conn(conn); 4378 4379 spin_lock_bh(&sess->conn_lock); 4380 atomic_dec(&sess->nconn); 4381 pr_debug("Decremented iSCSI connection count to %d from node:" 4382 " %s\n", atomic_read(&sess->nconn), 4383 sess->sess_ops->InitiatorName); 4384 /* 4385 * Make sure that if one connection fails in an non ERL=2 iSCSI 4386 * Session that they all fail. 4387 */ 4388 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4389 !atomic_read(&sess->session_logout)) 4390 atomic_set(&sess->session_fall_back_to_erl0, 1); 4391 4392 /* 4393 * If this was not the last connection in the session, and we are 4394 * performing session reinstatement or falling back to ERL=0, call 4395 * iscsit_stop_session() without sleeping to shutdown the other 4396 * active connections. 4397 */ 4398 if (atomic_read(&sess->nconn)) { 4399 if (!atomic_read(&sess->session_reinstatement) && 4400 !atomic_read(&sess->session_fall_back_to_erl0)) { 4401 spin_unlock_bh(&sess->conn_lock); 4402 return 0; 4403 } 4404 if (!atomic_read(&sess->session_stop_active)) { 4405 atomic_set(&sess->session_stop_active, 1); 4406 spin_unlock_bh(&sess->conn_lock); 4407 iscsit_stop_session(sess, 0, 0); 4408 return 0; 4409 } 4410 spin_unlock_bh(&sess->conn_lock); 4411 return 0; 4412 } 4413 4414 /* 4415 * If this was the last connection in the session and one of the 4416 * following is occurring: 4417 * 4418 * Session Reinstatement is not being performed, and are falling back 4419 * to ERL=0 call iscsit_close_session(). 4420 * 4421 * Session Logout was requested. iscsit_close_session() will be called 4422 * elsewhere. 4423 * 4424 * Session Continuation is not being performed, start the Time2Retain 4425 * handler and check if sleep_on_sess_wait_sem is active. 4426 */ 4427 if (!atomic_read(&sess->session_reinstatement) && 4428 atomic_read(&sess->session_fall_back_to_erl0)) { 4429 spin_unlock_bh(&sess->conn_lock); 4430 complete_all(&sess->session_wait_comp); 4431 iscsit_close_session(sess, true); 4432 4433 return 0; 4434 } else if (atomic_read(&sess->session_logout)) { 4435 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4436 sess->session_state = TARG_SESS_STATE_FREE; 4437 4438 if (atomic_read(&sess->session_close)) { 4439 spin_unlock_bh(&sess->conn_lock); 4440 complete_all(&sess->session_wait_comp); 4441 iscsit_close_session(sess, true); 4442 } else { 4443 spin_unlock_bh(&sess->conn_lock); 4444 } 4445 4446 return 0; 4447 } else { 4448 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4449 sess->session_state = TARG_SESS_STATE_FAILED; 4450 4451 if (!atomic_read(&sess->session_continuation)) 4452 iscsit_start_time2retain_handler(sess); 4453 4454 if (atomic_read(&sess->session_close)) { 4455 spin_unlock_bh(&sess->conn_lock); 4456 complete_all(&sess->session_wait_comp); 4457 iscsit_close_session(sess, true); 4458 } else { 4459 spin_unlock_bh(&sess->conn_lock); 4460 } 4461 4462 return 0; 4463 } 4464 } 4465 4466 /* 4467 * If the iSCSI Session for the iSCSI Initiator Node exists, 4468 * forcefully shutdown the iSCSI NEXUS. 4469 */ 4470 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) 4471 { 4472 struct iscsi_portal_group *tpg = sess->tpg; 4473 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4474 4475 if (atomic_read(&sess->nconn)) { 4476 pr_err("%d connection(s) still exist for iSCSI session" 4477 " to %s\n", atomic_read(&sess->nconn), 4478 sess->sess_ops->InitiatorName); 4479 BUG(); 4480 } 4481 4482 spin_lock_bh(&se_tpg->session_lock); 4483 atomic_set(&sess->session_logout, 1); 4484 atomic_set(&sess->session_reinstatement, 1); 4485 iscsit_stop_time2retain_timer(sess); 4486 spin_unlock_bh(&se_tpg->session_lock); 4487 4488 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4489 iscsit_free_connection_recovery_entries(sess); 4490 4491 /* 4492 * transport_deregister_session_configfs() will clear the 4493 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4494 * can be setting it again with __transport_register_session() in 4495 * iscsi_post_login_handler() again after the iscsit_stop_session() 4496 * completes in iscsi_np context. 4497 */ 4498 transport_deregister_session_configfs(sess->se_sess); 4499 4500 /* 4501 * If any other processes are accessing this session pointer we must 4502 * wait until they have completed. If we are in an interrupt (the 4503 * time2retain handler) and contain and active session usage count we 4504 * restart the timer and exit. 4505 */ 4506 if (iscsit_check_session_usage_count(sess, can_sleep)) { 4507 atomic_set(&sess->session_logout, 0); 4508 iscsit_start_time2retain_handler(sess); 4509 return 0; 4510 } 4511 4512 transport_deregister_session(sess->se_sess); 4513 4514 iscsit_free_all_ooo_cmdsns(sess); 4515 4516 spin_lock_bh(&se_tpg->session_lock); 4517 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4518 sess->session_state = TARG_SESS_STATE_FREE; 4519 pr_debug("Released iSCSI session from node: %s\n", 4520 sess->sess_ops->InitiatorName); 4521 tpg->nsessions--; 4522 if (tpg->tpg_tiqn) 4523 tpg->tpg_tiqn->tiqn_nsessions--; 4524 4525 pr_debug("Decremented number of active iSCSI Sessions on" 4526 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4527 4528 ida_free(&sess_ida, sess->session_index); 4529 kfree(sess->sess_ops); 4530 sess->sess_ops = NULL; 4531 spin_unlock_bh(&se_tpg->session_lock); 4532 4533 kfree(sess); 4534 return 0; 4535 } 4536 4537 static void iscsit_logout_post_handler_closesession( 4538 struct iscsit_conn *conn) 4539 { 4540 struct iscsit_session *sess = conn->sess; 4541 int sleep = 1; 4542 /* 4543 * Traditional iscsi/tcp will invoke this logic from TX thread 4544 * context during session logout, so clear tx_thread_active and 4545 * sleep if iscsit_close_connection() has not already occured. 4546 * 4547 * Since iser-target invokes this logic from it's own workqueue, 4548 * always sleep waiting for RX/TX thread shutdown to complete 4549 * within iscsit_close_connection(). 4550 */ 4551 if (!conn->conn_transport->rdma_shutdown) { 4552 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4553 if (!sleep) 4554 return; 4555 } 4556 4557 atomic_set(&conn->conn_logout_remove, 0); 4558 complete(&conn->conn_logout_comp); 4559 4560 iscsit_dec_conn_usage_count(conn); 4561 atomic_set(&sess->session_close, 1); 4562 iscsit_stop_session(sess, sleep, sleep); 4563 iscsit_dec_session_usage_count(sess); 4564 } 4565 4566 static void iscsit_logout_post_handler_samecid( 4567 struct iscsit_conn *conn) 4568 { 4569 int sleep = 1; 4570 4571 if (!conn->conn_transport->rdma_shutdown) { 4572 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4573 if (!sleep) 4574 return; 4575 } 4576 4577 atomic_set(&conn->conn_logout_remove, 0); 4578 complete(&conn->conn_logout_comp); 4579 4580 iscsit_cause_connection_reinstatement(conn, sleep); 4581 iscsit_dec_conn_usage_count(conn); 4582 } 4583 4584 static void iscsit_logout_post_handler_diffcid( 4585 struct iscsit_conn *conn, 4586 u16 cid) 4587 { 4588 struct iscsit_conn *l_conn; 4589 struct iscsit_session *sess = conn->sess; 4590 bool conn_found = false; 4591 4592 if (!sess) 4593 return; 4594 4595 spin_lock_bh(&sess->conn_lock); 4596 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4597 if (l_conn->cid == cid) { 4598 iscsit_inc_conn_usage_count(l_conn); 4599 conn_found = true; 4600 break; 4601 } 4602 } 4603 spin_unlock_bh(&sess->conn_lock); 4604 4605 if (!conn_found) 4606 return; 4607 4608 if (l_conn->sock) 4609 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4610 4611 spin_lock_bh(&l_conn->state_lock); 4612 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4613 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4614 spin_unlock_bh(&l_conn->state_lock); 4615 4616 iscsit_cause_connection_reinstatement(l_conn, 1); 4617 iscsit_dec_conn_usage_count(l_conn); 4618 } 4619 4620 /* 4621 * Return of 0 causes the TX thread to restart. 4622 */ 4623 int iscsit_logout_post_handler( 4624 struct iscsit_cmd *cmd, 4625 struct iscsit_conn *conn) 4626 { 4627 int ret = 0; 4628 4629 switch (cmd->logout_reason) { 4630 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4631 switch (cmd->logout_response) { 4632 case ISCSI_LOGOUT_SUCCESS: 4633 case ISCSI_LOGOUT_CLEANUP_FAILED: 4634 default: 4635 iscsit_logout_post_handler_closesession(conn); 4636 break; 4637 } 4638 break; 4639 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4640 if (conn->cid == cmd->logout_cid) { 4641 switch (cmd->logout_response) { 4642 case ISCSI_LOGOUT_SUCCESS: 4643 case ISCSI_LOGOUT_CLEANUP_FAILED: 4644 default: 4645 iscsit_logout_post_handler_samecid(conn); 4646 break; 4647 } 4648 } else { 4649 switch (cmd->logout_response) { 4650 case ISCSI_LOGOUT_SUCCESS: 4651 iscsit_logout_post_handler_diffcid(conn, 4652 cmd->logout_cid); 4653 break; 4654 case ISCSI_LOGOUT_CID_NOT_FOUND: 4655 case ISCSI_LOGOUT_CLEANUP_FAILED: 4656 default: 4657 break; 4658 } 4659 ret = 1; 4660 } 4661 break; 4662 case ISCSI_LOGOUT_REASON_RECOVERY: 4663 switch (cmd->logout_response) { 4664 case ISCSI_LOGOUT_SUCCESS: 4665 case ISCSI_LOGOUT_CID_NOT_FOUND: 4666 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4667 case ISCSI_LOGOUT_CLEANUP_FAILED: 4668 default: 4669 break; 4670 } 4671 ret = 1; 4672 break; 4673 default: 4674 break; 4675 4676 } 4677 return ret; 4678 } 4679 EXPORT_SYMBOL(iscsit_logout_post_handler); 4680 4681 void iscsit_stop_session( 4682 struct iscsit_session *sess, 4683 int session_sleep, 4684 int connection_sleep) 4685 { 4686 u16 conn_count = atomic_read(&sess->nconn); 4687 struct iscsit_conn *conn, *conn_tmp = NULL; 4688 int is_last; 4689 4690 spin_lock_bh(&sess->conn_lock); 4691 4692 if (connection_sleep) { 4693 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4694 conn_list) { 4695 if (conn_count == 0) 4696 break; 4697 4698 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4699 is_last = 1; 4700 } else { 4701 iscsit_inc_conn_usage_count(conn_tmp); 4702 is_last = 0; 4703 } 4704 iscsit_inc_conn_usage_count(conn); 4705 4706 spin_unlock_bh(&sess->conn_lock); 4707 iscsit_cause_connection_reinstatement(conn, 1); 4708 spin_lock_bh(&sess->conn_lock); 4709 4710 iscsit_dec_conn_usage_count(conn); 4711 if (is_last == 0) 4712 iscsit_dec_conn_usage_count(conn_tmp); 4713 conn_count--; 4714 } 4715 } else { 4716 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4717 iscsit_cause_connection_reinstatement(conn, 0); 4718 } 4719 4720 if (session_sleep && atomic_read(&sess->nconn)) { 4721 spin_unlock_bh(&sess->conn_lock); 4722 wait_for_completion(&sess->session_wait_comp); 4723 } else 4724 spin_unlock_bh(&sess->conn_lock); 4725 } 4726 4727 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4728 { 4729 struct iscsit_session *sess; 4730 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4731 struct se_session *se_sess, *se_sess_tmp; 4732 LIST_HEAD(free_list); 4733 int session_count = 0; 4734 4735 spin_lock_bh(&se_tpg->session_lock); 4736 if (tpg->nsessions && !force) { 4737 spin_unlock_bh(&se_tpg->session_lock); 4738 return -1; 4739 } 4740 4741 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4742 sess_list) { 4743 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4744 4745 spin_lock(&sess->conn_lock); 4746 if (atomic_read(&sess->session_fall_back_to_erl0) || 4747 atomic_read(&sess->session_logout) || 4748 atomic_read(&sess->session_close) || 4749 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4750 spin_unlock(&sess->conn_lock); 4751 continue; 4752 } 4753 iscsit_inc_session_usage_count(sess); 4754 atomic_set(&sess->session_reinstatement, 1); 4755 atomic_set(&sess->session_fall_back_to_erl0, 1); 4756 atomic_set(&sess->session_close, 1); 4757 spin_unlock(&sess->conn_lock); 4758 4759 list_move_tail(&se_sess->sess_list, &free_list); 4760 } 4761 spin_unlock_bh(&se_tpg->session_lock); 4762 4763 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4764 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4765 4766 list_del_init(&se_sess->sess_list); 4767 iscsit_stop_session(sess, 1, 1); 4768 iscsit_dec_session_usage_count(sess); 4769 session_count++; 4770 } 4771 4772 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4773 " Group: %hu\n", session_count, tpg->tpgt); 4774 return 0; 4775 } 4776 4777 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4778 MODULE_VERSION("4.1.x"); 4779 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4780 MODULE_LICENSE("GPL"); 4781 4782 module_init(iscsi_target_init_module); 4783 module_exit(iscsi_target_cleanup_module); 4784