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