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 transport_check_aborted_status(se_cmd, 1497 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1498 return iscsit_dump_data_payload(conn, payload_length, 1); 1499 } 1500 } else { 1501 /* 1502 * For the normal solicited data path: 1503 * 1504 * Check for a delayed TASK_ABORTED status and dump any 1505 * incoming data out payload if one exists. Also, when the 1506 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1507 * data out sequence, we decrement outstanding_r2ts. Once 1508 * outstanding_r2ts reaches zero, go ahead and send the delayed 1509 * TASK_ABORTED status. 1510 */ 1511 if (se_cmd->transport_state & CMD_T_ABORTED) { 1512 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1513 if (--cmd->outstanding_r2ts < 1) { 1514 iscsit_stop_dataout_timer(cmd); 1515 transport_check_aborted_status( 1516 se_cmd, 1); 1517 } 1518 1519 return iscsit_dump_data_payload(conn, payload_length, 1); 1520 } 1521 } 1522 /* 1523 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1524 * within-command recovery checks before receiving the payload. 1525 */ 1526 rc = iscsit_check_pre_dataout(cmd, buf); 1527 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1528 return 0; 1529 else if (rc == DATAOUT_CANNOT_RECOVER) 1530 return -1; 1531 *success = true; 1532 return 0; 1533 } 1534 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1535 1536 int 1537 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1538 struct iscsi_cmd **out_cmd) 1539 { 1540 struct iscsi_data *hdr = buf; 1541 struct iscsi_cmd *cmd; 1542 u32 payload_length = ntoh24(hdr->dlength); 1543 int rc; 1544 bool success = false; 1545 1546 if (!payload_length) { 1547 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1548 return 0; 1549 } 1550 1551 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1552 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1553 " MaxXmitDataSegmentLength: %u\n", payload_length, 1554 conn->conn_ops->MaxXmitDataSegmentLength); 1555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1556 } 1557 1558 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1559 if (!cmd) 1560 return 0; 1561 1562 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1563 1564 if (success) 1565 *out_cmd = cmd; 1566 1567 return rc; 1568 } 1569 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1570 1571 static int 1572 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1573 struct iscsi_data *hdr) 1574 { 1575 struct kvec *iov; 1576 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1577 u32 payload_length = ntoh24(hdr->dlength); 1578 int iov_ret, data_crc_failed = 0; 1579 1580 rx_size += payload_length; 1581 iov = &cmd->iov_data[0]; 1582 1583 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1584 payload_length); 1585 if (iov_ret < 0) 1586 return -1; 1587 1588 iov_count += iov_ret; 1589 1590 padding = ((-payload_length) & 3); 1591 if (padding != 0) { 1592 iov[iov_count].iov_base = cmd->pad_bytes; 1593 iov[iov_count++].iov_len = padding; 1594 rx_size += padding; 1595 pr_debug("Receiving %u padding bytes.\n", padding); 1596 } 1597 1598 if (conn->conn_ops->DataDigest) { 1599 iov[iov_count].iov_base = &checksum; 1600 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1601 rx_size += ISCSI_CRC_LEN; 1602 } 1603 1604 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1605 1606 iscsit_unmap_iovec(cmd); 1607 1608 if (rx_got != rx_size) 1609 return -1; 1610 1611 if (conn->conn_ops->DataDigest) { 1612 u32 data_crc; 1613 1614 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1615 be32_to_cpu(hdr->offset), 1616 payload_length, padding, 1617 cmd->pad_bytes); 1618 1619 if (checksum != data_crc) { 1620 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1621 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1622 " does not match computed 0x%08x\n", 1623 hdr->itt, hdr->offset, payload_length, 1624 hdr->datasn, checksum, data_crc); 1625 data_crc_failed = 1; 1626 } else { 1627 pr_debug("Got CRC32C DataDigest 0x%08x for" 1628 " %u bytes of Data Out\n", checksum, 1629 payload_length); 1630 } 1631 } 1632 1633 return data_crc_failed; 1634 } 1635 1636 int 1637 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1638 bool data_crc_failed) 1639 { 1640 struct iscsi_conn *conn = cmd->conn; 1641 int rc, ooo_cmdsn; 1642 /* 1643 * Increment post receive data and CRC values or perform 1644 * within-command recovery. 1645 */ 1646 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1647 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1648 return 0; 1649 else if (rc == DATAOUT_SEND_R2T) { 1650 iscsit_set_dataout_sequence_values(cmd); 1651 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1652 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1653 /* 1654 * Handle extra special case for out of order 1655 * Unsolicited Data Out. 1656 */ 1657 spin_lock_bh(&cmd->istate_lock); 1658 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1659 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1660 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1661 spin_unlock_bh(&cmd->istate_lock); 1662 1663 iscsit_stop_dataout_timer(cmd); 1664 if (ooo_cmdsn) 1665 return 0; 1666 target_execute_cmd(&cmd->se_cmd); 1667 return 0; 1668 } else /* DATAOUT_CANNOT_RECOVER */ 1669 return -1; 1670 1671 return 0; 1672 } 1673 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1674 1675 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1676 { 1677 struct iscsi_cmd *cmd = NULL; 1678 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1679 int rc; 1680 bool data_crc_failed = false; 1681 1682 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1683 if (rc < 0) 1684 return 0; 1685 else if (!cmd) 1686 return 0; 1687 1688 rc = iscsit_get_dataout(conn, cmd, hdr); 1689 if (rc < 0) 1690 return rc; 1691 else if (rc > 0) 1692 data_crc_failed = true; 1693 1694 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1695 } 1696 1697 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1698 struct iscsi_nopout *hdr) 1699 { 1700 u32 payload_length = ntoh24(hdr->dlength); 1701 1702 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1703 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1704 if (!cmd) 1705 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1706 (unsigned char *)hdr); 1707 1708 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1709 (unsigned char *)hdr); 1710 } 1711 1712 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1713 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1714 " not set, protocol error.\n"); 1715 if (!cmd) 1716 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1717 (unsigned char *)hdr); 1718 1719 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1720 (unsigned char *)hdr); 1721 } 1722 1723 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1724 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1725 " greater than MaxXmitDataSegmentLength: %u, protocol" 1726 " error.\n", payload_length, 1727 conn->conn_ops->MaxXmitDataSegmentLength); 1728 if (!cmd) 1729 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1730 (unsigned char *)hdr); 1731 1732 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1733 (unsigned char *)hdr); 1734 } 1735 1736 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1737 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1738 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1739 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1740 payload_length); 1741 /* 1742 * This is not a response to a Unsolicited NopIN, which means 1743 * it can either be a NOPOUT ping request (with a valid ITT), 1744 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1745 * Either way, make sure we allocate an struct iscsi_cmd, as both 1746 * can contain ping data. 1747 */ 1748 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1749 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1750 cmd->i_state = ISTATE_SEND_NOPIN; 1751 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1752 1 : 0); 1753 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1754 cmd->targ_xfer_tag = 0xFFFFFFFF; 1755 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1756 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1757 cmd->data_direction = DMA_NONE; 1758 } 1759 1760 return 0; 1761 } 1762 EXPORT_SYMBOL(iscsit_setup_nop_out); 1763 1764 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1765 struct iscsi_nopout *hdr) 1766 { 1767 struct iscsi_cmd *cmd_p = NULL; 1768 int cmdsn_ret = 0; 1769 /* 1770 * Initiator is expecting a NopIN ping reply.. 1771 */ 1772 if (hdr->itt != RESERVED_ITT) { 1773 if (!cmd) 1774 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1775 (unsigned char *)hdr); 1776 1777 spin_lock_bh(&conn->cmd_lock); 1778 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1779 spin_unlock_bh(&conn->cmd_lock); 1780 1781 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1782 1783 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1784 iscsit_add_cmd_to_response_queue(cmd, conn, 1785 cmd->i_state); 1786 return 0; 1787 } 1788 1789 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1790 (unsigned char *)hdr, hdr->cmdsn); 1791 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1792 return 0; 1793 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1794 return -1; 1795 1796 return 0; 1797 } 1798 /* 1799 * This was a response to a unsolicited NOPIN ping. 1800 */ 1801 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1802 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1803 if (!cmd_p) 1804 return -EINVAL; 1805 1806 iscsit_stop_nopin_response_timer(conn); 1807 1808 cmd_p->i_state = ISTATE_REMOVE; 1809 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1810 1811 iscsit_start_nopin_timer(conn); 1812 return 0; 1813 } 1814 /* 1815 * Otherwise, initiator is not expecting a NOPIN is response. 1816 * Just ignore for now. 1817 */ 1818 1819 if (cmd) 1820 iscsit_free_cmd(cmd, false); 1821 1822 return 0; 1823 } 1824 EXPORT_SYMBOL(iscsit_process_nop_out); 1825 1826 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1827 unsigned char *buf) 1828 { 1829 unsigned char *ping_data = NULL; 1830 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1831 struct kvec *iov = NULL; 1832 u32 payload_length = ntoh24(hdr->dlength); 1833 int ret; 1834 1835 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1836 if (ret < 0) 1837 return 0; 1838 /* 1839 * Handle NOP-OUT payload for traditional iSCSI sockets 1840 */ 1841 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1842 u32 checksum, data_crc, padding = 0; 1843 int niov = 0, rx_got, rx_size = payload_length; 1844 1845 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1846 if (!ping_data) { 1847 ret = -1; 1848 goto out; 1849 } 1850 1851 iov = &cmd->iov_misc[0]; 1852 iov[niov].iov_base = ping_data; 1853 iov[niov++].iov_len = payload_length; 1854 1855 padding = ((-payload_length) & 3); 1856 if (padding != 0) { 1857 pr_debug("Receiving %u additional bytes" 1858 " for padding.\n", padding); 1859 iov[niov].iov_base = &cmd->pad_bytes; 1860 iov[niov++].iov_len = padding; 1861 rx_size += padding; 1862 } 1863 if (conn->conn_ops->DataDigest) { 1864 iov[niov].iov_base = &checksum; 1865 iov[niov++].iov_len = ISCSI_CRC_LEN; 1866 rx_size += ISCSI_CRC_LEN; 1867 } 1868 1869 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1870 if (rx_got != rx_size) { 1871 ret = -1; 1872 goto out; 1873 } 1874 1875 if (conn->conn_ops->DataDigest) { 1876 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1877 payload_length, padding, 1878 cmd->pad_bytes, &data_crc); 1879 1880 if (checksum != data_crc) { 1881 pr_err("Ping data CRC32C DataDigest" 1882 " 0x%08x does not match computed 0x%08x\n", 1883 checksum, data_crc); 1884 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1885 pr_err("Unable to recover from" 1886 " NOPOUT Ping DataCRC failure while in" 1887 " ERL=0.\n"); 1888 ret = -1; 1889 goto out; 1890 } else { 1891 /* 1892 * Silently drop this PDU and let the 1893 * initiator plug the CmdSN gap. 1894 */ 1895 pr_debug("Dropping NOPOUT" 1896 " Command CmdSN: 0x%08x due to" 1897 " DataCRC error.\n", hdr->cmdsn); 1898 ret = 0; 1899 goto out; 1900 } 1901 } else { 1902 pr_debug("Got CRC32C DataDigest" 1903 " 0x%08x for %u bytes of ping data.\n", 1904 checksum, payload_length); 1905 } 1906 } 1907 1908 ping_data[payload_length] = '\0'; 1909 /* 1910 * Attach ping data to struct iscsi_cmd->buf_ptr. 1911 */ 1912 cmd->buf_ptr = ping_data; 1913 cmd->buf_ptr_size = payload_length; 1914 1915 pr_debug("Got %u bytes of NOPOUT ping" 1916 " data.\n", payload_length); 1917 pr_debug("Ping Data: \"%s\"\n", ping_data); 1918 } 1919 1920 return iscsit_process_nop_out(conn, cmd, hdr); 1921 out: 1922 if (cmd) 1923 iscsit_free_cmd(cmd, false); 1924 1925 kfree(ping_data); 1926 return ret; 1927 } 1928 1929 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1930 { 1931 switch (iscsi_tmf) { 1932 case ISCSI_TM_FUNC_ABORT_TASK: 1933 return TMR_ABORT_TASK; 1934 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1935 return TMR_ABORT_TASK_SET; 1936 case ISCSI_TM_FUNC_CLEAR_ACA: 1937 return TMR_CLEAR_ACA; 1938 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1939 return TMR_CLEAR_TASK_SET; 1940 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1941 return TMR_LUN_RESET; 1942 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1943 return TMR_TARGET_WARM_RESET; 1944 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1945 return TMR_TARGET_COLD_RESET; 1946 default: 1947 return TMR_UNKNOWN; 1948 } 1949 } 1950 1951 int 1952 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1953 unsigned char *buf) 1954 { 1955 struct se_tmr_req *se_tmr; 1956 struct iscsi_tmr_req *tmr_req; 1957 struct iscsi_tm *hdr; 1958 int out_of_order_cmdsn = 0, ret; 1959 u8 function, tcm_function = TMR_UNKNOWN; 1960 1961 hdr = (struct iscsi_tm *) buf; 1962 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1963 function = hdr->flags; 1964 1965 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1966 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1967 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1968 hdr->rtt, hdr->refcmdsn, conn->cid); 1969 1970 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1971 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1972 hdr->rtt != RESERVED_ITT)) { 1973 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1974 hdr->rtt = RESERVED_ITT; 1975 } 1976 1977 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1978 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1979 pr_err("Task Management Request TASK_REASSIGN not" 1980 " issued as immediate command, bad iSCSI Initiator" 1981 "implementation\n"); 1982 return iscsit_add_reject_cmd(cmd, 1983 ISCSI_REASON_PROTOCOL_ERROR, buf); 1984 } 1985 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1986 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1987 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1988 1989 cmd->data_direction = DMA_NONE; 1990 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1991 if (!cmd->tmr_req) { 1992 return iscsit_add_reject_cmd(cmd, 1993 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1994 buf); 1995 } 1996 1997 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1998 conn->sess->se_sess, 0, DMA_NONE, 1999 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2000 2001 target_get_sess_cmd(&cmd->se_cmd, true); 2002 2003 /* 2004 * TASK_REASSIGN for ERL=2 / connection stays inside of 2005 * LIO-Target $FABRIC_MOD 2006 */ 2007 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2008 tcm_function = iscsit_convert_tmf(function); 2009 if (tcm_function == TMR_UNKNOWN) { 2010 pr_err("Unknown iSCSI TMR Function:" 2011 " 0x%02x\n", function); 2012 return iscsit_add_reject_cmd(cmd, 2013 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2014 } 2015 } 2016 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2017 GFP_KERNEL); 2018 if (ret < 0) 2019 return iscsit_add_reject_cmd(cmd, 2020 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2021 2022 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2023 2024 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2025 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2026 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2027 cmd->init_task_tag = hdr->itt; 2028 cmd->targ_xfer_tag = 0xFFFFFFFF; 2029 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2030 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2031 se_tmr = cmd->se_cmd.se_tmr_req; 2032 tmr_req = cmd->tmr_req; 2033 /* 2034 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2035 */ 2036 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2037 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2038 scsilun_to_int(&hdr->lun)); 2039 if (ret < 0) { 2040 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2041 goto attach; 2042 } 2043 } 2044 2045 switch (function) { 2046 case ISCSI_TM_FUNC_ABORT_TASK: 2047 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2048 if (se_tmr->response) 2049 goto attach; 2050 break; 2051 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2052 case ISCSI_TM_FUNC_CLEAR_ACA: 2053 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2054 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2055 break; 2056 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2057 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2058 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2059 goto attach; 2060 } 2061 break; 2062 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2063 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2064 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2065 goto attach; 2066 } 2067 break; 2068 case ISCSI_TM_FUNC_TASK_REASSIGN: 2069 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2070 /* 2071 * Perform sanity checks on the ExpDataSN only if the 2072 * TASK_REASSIGN was successful. 2073 */ 2074 if (se_tmr->response) 2075 break; 2076 2077 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2078 return iscsit_add_reject_cmd(cmd, 2079 ISCSI_REASON_BOOKMARK_INVALID, buf); 2080 break; 2081 default: 2082 pr_err("Unknown TMR function: 0x%02x, protocol" 2083 " error.\n", function); 2084 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2085 goto attach; 2086 } 2087 2088 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2089 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2090 se_tmr->call_transport = 1; 2091 attach: 2092 spin_lock_bh(&conn->cmd_lock); 2093 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2094 spin_unlock_bh(&conn->cmd_lock); 2095 2096 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2097 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2098 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2099 out_of_order_cmdsn = 1; 2100 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2101 target_put_sess_cmd(&cmd->se_cmd); 2102 return 0; 2103 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2104 return -1; 2105 } 2106 } 2107 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2108 2109 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2110 return 0; 2111 /* 2112 * Found the referenced task, send to transport for processing. 2113 */ 2114 if (se_tmr->call_transport) 2115 return transport_generic_handle_tmr(&cmd->se_cmd); 2116 2117 /* 2118 * Could not find the referenced LUN, task, or Task Management 2119 * command not authorized or supported. Change state and 2120 * let the tx_thread send the response. 2121 * 2122 * For connection recovery, this is also the default action for 2123 * TMR TASK_REASSIGN. 2124 */ 2125 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2126 target_put_sess_cmd(&cmd->se_cmd); 2127 return 0; 2128 } 2129 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2130 2131 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2132 int 2133 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2134 struct iscsi_text *hdr) 2135 { 2136 u32 payload_length = ntoh24(hdr->dlength); 2137 2138 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2139 pr_err("Unable to accept text parameter length: %u" 2140 "greater than MaxXmitDataSegmentLength %u.\n", 2141 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2142 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2143 (unsigned char *)hdr); 2144 } 2145 2146 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2147 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2148 pr_err("Multi sequence text commands currently not supported\n"); 2149 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2150 (unsigned char *)hdr); 2151 } 2152 2153 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2154 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2155 hdr->exp_statsn, payload_length); 2156 2157 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2158 cmd->i_state = ISTATE_SEND_TEXTRSP; 2159 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2160 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2161 cmd->targ_xfer_tag = 0xFFFFFFFF; 2162 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2163 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2164 cmd->data_direction = DMA_NONE; 2165 kfree(cmd->text_in_ptr); 2166 cmd->text_in_ptr = NULL; 2167 2168 return 0; 2169 } 2170 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2171 2172 int 2173 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2174 struct iscsi_text *hdr) 2175 { 2176 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2177 int cmdsn_ret; 2178 2179 if (!text_in) { 2180 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2181 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2182 pr_err("Unable to locate text_in buffer for sendtargets" 2183 " discovery\n"); 2184 goto reject; 2185 } 2186 goto empty_sendtargets; 2187 } 2188 if (strncmp("SendTargets", text_in, 11) != 0) { 2189 pr_err("Received Text Data that is not" 2190 " SendTargets, cannot continue.\n"); 2191 goto reject; 2192 } 2193 text_ptr = strchr(text_in, '='); 2194 if (!text_ptr) { 2195 pr_err("No \"=\" separator found in Text Data," 2196 " cannot continue.\n"); 2197 goto reject; 2198 } 2199 if (!strncmp("=All", text_ptr, 4)) { 2200 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2201 } else if (!strncmp("=iqn.", text_ptr, 5) || 2202 !strncmp("=eui.", text_ptr, 5)) { 2203 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2204 } else { 2205 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2206 goto reject; 2207 } 2208 2209 spin_lock_bh(&conn->cmd_lock); 2210 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2211 spin_unlock_bh(&conn->cmd_lock); 2212 2213 empty_sendtargets: 2214 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2215 2216 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2217 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2218 (unsigned char *)hdr, hdr->cmdsn); 2219 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2220 return -1; 2221 2222 return 0; 2223 } 2224 2225 return iscsit_execute_cmd(cmd, 0); 2226 2227 reject: 2228 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2229 (unsigned char *)hdr); 2230 } 2231 EXPORT_SYMBOL(iscsit_process_text_cmd); 2232 2233 static int 2234 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2235 unsigned char *buf) 2236 { 2237 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2238 char *text_in = NULL; 2239 u32 payload_length = ntoh24(hdr->dlength); 2240 int rx_size, rc; 2241 2242 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2243 if (rc < 0) 2244 return 0; 2245 2246 rx_size = payload_length; 2247 if (payload_length) { 2248 u32 checksum = 0, data_crc = 0; 2249 u32 padding = 0, pad_bytes = 0; 2250 int niov = 0, rx_got; 2251 struct kvec iov[3]; 2252 2253 text_in = kzalloc(payload_length, GFP_KERNEL); 2254 if (!text_in) 2255 goto reject; 2256 2257 cmd->text_in_ptr = text_in; 2258 2259 memset(iov, 0, 3 * sizeof(struct kvec)); 2260 iov[niov].iov_base = text_in; 2261 iov[niov++].iov_len = payload_length; 2262 2263 padding = ((-payload_length) & 3); 2264 if (padding != 0) { 2265 iov[niov].iov_base = &pad_bytes; 2266 iov[niov++].iov_len = padding; 2267 rx_size += padding; 2268 pr_debug("Receiving %u additional bytes" 2269 " for padding.\n", padding); 2270 } 2271 if (conn->conn_ops->DataDigest) { 2272 iov[niov].iov_base = &checksum; 2273 iov[niov++].iov_len = ISCSI_CRC_LEN; 2274 rx_size += ISCSI_CRC_LEN; 2275 } 2276 2277 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2278 if (rx_got != rx_size) 2279 goto reject; 2280 2281 if (conn->conn_ops->DataDigest) { 2282 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in, 2283 payload_length, padding, 2284 &pad_bytes, &data_crc); 2285 2286 if (checksum != data_crc) { 2287 pr_err("Text data CRC32C DataDigest" 2288 " 0x%08x does not match computed" 2289 " 0x%08x\n", checksum, data_crc); 2290 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2291 pr_err("Unable to recover from" 2292 " Text Data digest failure while in" 2293 " ERL=0.\n"); 2294 goto reject; 2295 } else { 2296 /* 2297 * Silently drop this PDU and let the 2298 * initiator plug the CmdSN gap. 2299 */ 2300 pr_debug("Dropping Text" 2301 " Command CmdSN: 0x%08x due to" 2302 " DataCRC error.\n", hdr->cmdsn); 2303 kfree(text_in); 2304 return 0; 2305 } 2306 } else { 2307 pr_debug("Got CRC32C DataDigest" 2308 " 0x%08x for %u bytes of text data.\n", 2309 checksum, payload_length); 2310 } 2311 } 2312 text_in[payload_length - 1] = '\0'; 2313 pr_debug("Successfully read %d bytes of text" 2314 " data.\n", payload_length); 2315 } 2316 2317 return iscsit_process_text_cmd(conn, cmd, hdr); 2318 2319 reject: 2320 kfree(cmd->text_in_ptr); 2321 cmd->text_in_ptr = NULL; 2322 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2323 } 2324 2325 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2326 { 2327 struct iscsi_conn *conn_p; 2328 struct iscsi_session *sess = conn->sess; 2329 2330 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2331 " for SID: %u.\n", conn->cid, conn->sess->sid); 2332 2333 atomic_set(&sess->session_logout, 1); 2334 atomic_set(&conn->conn_logout_remove, 1); 2335 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2336 2337 iscsit_inc_conn_usage_count(conn); 2338 iscsit_inc_session_usage_count(sess); 2339 2340 spin_lock_bh(&sess->conn_lock); 2341 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2342 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2343 continue; 2344 2345 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2346 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2347 } 2348 spin_unlock_bh(&sess->conn_lock); 2349 2350 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2351 2352 return 0; 2353 } 2354 2355 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2356 { 2357 struct iscsi_conn *l_conn; 2358 struct iscsi_session *sess = conn->sess; 2359 2360 pr_debug("Received logout request CLOSECONNECTION for CID:" 2361 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2362 2363 /* 2364 * A Logout Request with a CLOSECONNECTION reason code for a CID 2365 * can arrive on a connection with a differing CID. 2366 */ 2367 if (conn->cid == cmd->logout_cid) { 2368 spin_lock_bh(&conn->state_lock); 2369 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2370 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2371 2372 atomic_set(&conn->conn_logout_remove, 1); 2373 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2374 iscsit_inc_conn_usage_count(conn); 2375 2376 spin_unlock_bh(&conn->state_lock); 2377 } else { 2378 /* 2379 * Handle all different cid CLOSECONNECTION requests in 2380 * iscsit_logout_post_handler_diffcid() as to give enough 2381 * time for any non immediate command's CmdSN to be 2382 * acknowledged on the connection in question. 2383 * 2384 * Here we simply make sure the CID is still around. 2385 */ 2386 l_conn = iscsit_get_conn_from_cid(sess, 2387 cmd->logout_cid); 2388 if (!l_conn) { 2389 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2390 iscsit_add_cmd_to_response_queue(cmd, conn, 2391 cmd->i_state); 2392 return 0; 2393 } 2394 2395 iscsit_dec_conn_usage_count(l_conn); 2396 } 2397 2398 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2399 2400 return 0; 2401 } 2402 2403 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2404 { 2405 struct iscsi_session *sess = conn->sess; 2406 2407 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2408 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2409 2410 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2411 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2412 " while ERL!=2.\n"); 2413 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2414 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2415 return 0; 2416 } 2417 2418 if (conn->cid == cmd->logout_cid) { 2419 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2420 " with CID: %hu on CID: %hu, implementation error.\n", 2421 cmd->logout_cid, conn->cid); 2422 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2423 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2424 return 0; 2425 } 2426 2427 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2428 2429 return 0; 2430 } 2431 2432 int 2433 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2434 unsigned char *buf) 2435 { 2436 int cmdsn_ret, logout_remove = 0; 2437 u8 reason_code = 0; 2438 struct iscsi_logout *hdr; 2439 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2440 2441 hdr = (struct iscsi_logout *) buf; 2442 reason_code = (hdr->flags & 0x7f); 2443 2444 if (tiqn) { 2445 spin_lock(&tiqn->logout_stats.lock); 2446 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2447 tiqn->logout_stats.normal_logouts++; 2448 else 2449 tiqn->logout_stats.abnormal_logouts++; 2450 spin_unlock(&tiqn->logout_stats.lock); 2451 } 2452 2453 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2454 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2455 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2456 hdr->cid, conn->cid); 2457 2458 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2459 pr_err("Received logout request on connection that" 2460 " is not in logged in state, ignoring request.\n"); 2461 iscsit_free_cmd(cmd, false); 2462 return 0; 2463 } 2464 2465 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2466 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2467 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2468 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2469 cmd->targ_xfer_tag = 0xFFFFFFFF; 2470 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2471 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2472 cmd->logout_cid = be16_to_cpu(hdr->cid); 2473 cmd->logout_reason = reason_code; 2474 cmd->data_direction = DMA_NONE; 2475 2476 /* 2477 * We need to sleep in these cases (by returning 1) until the Logout 2478 * Response gets sent in the tx thread. 2479 */ 2480 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2481 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2482 be16_to_cpu(hdr->cid) == conn->cid)) 2483 logout_remove = 1; 2484 2485 spin_lock_bh(&conn->cmd_lock); 2486 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2487 spin_unlock_bh(&conn->cmd_lock); 2488 2489 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2490 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2491 2492 /* 2493 * Immediate commands are executed, well, immediately. 2494 * Non-Immediate Logout Commands are executed in CmdSN order. 2495 */ 2496 if (cmd->immediate_cmd) { 2497 int ret = iscsit_execute_cmd(cmd, 0); 2498 2499 if (ret < 0) 2500 return ret; 2501 } else { 2502 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2503 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2504 logout_remove = 0; 2505 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2506 return -1; 2507 } 2508 2509 return logout_remove; 2510 } 2511 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2512 2513 int iscsit_handle_snack( 2514 struct iscsi_conn *conn, 2515 unsigned char *buf) 2516 { 2517 struct iscsi_snack *hdr; 2518 2519 hdr = (struct iscsi_snack *) buf; 2520 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2521 2522 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2523 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2524 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2525 hdr->begrun, hdr->runlength, conn->cid); 2526 2527 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2528 pr_err("Initiator sent SNACK request while in" 2529 " ErrorRecoveryLevel=0.\n"); 2530 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2531 buf); 2532 } 2533 /* 2534 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2535 * call from inside iscsi_send_recovery_datain_or_r2t(). 2536 */ 2537 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2538 case 0: 2539 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2540 hdr->itt, 2541 be32_to_cpu(hdr->ttt), 2542 be32_to_cpu(hdr->begrun), 2543 be32_to_cpu(hdr->runlength)); 2544 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2545 return iscsit_handle_status_snack(conn, hdr->itt, 2546 be32_to_cpu(hdr->ttt), 2547 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2548 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2549 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2550 be32_to_cpu(hdr->begrun), 2551 be32_to_cpu(hdr->runlength)); 2552 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2553 /* FIXME: Support R-Data SNACK */ 2554 pr_err("R-Data SNACK Not Supported.\n"); 2555 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2556 buf); 2557 default: 2558 pr_err("Unknown SNACK type 0x%02x, protocol" 2559 " error.\n", hdr->flags & 0x0f); 2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2561 buf); 2562 } 2563 2564 return 0; 2565 } 2566 EXPORT_SYMBOL(iscsit_handle_snack); 2567 2568 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2569 { 2570 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2571 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2572 wait_for_completion_interruptible_timeout( 2573 &conn->rx_half_close_comp, 2574 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2575 } 2576 } 2577 2578 static int iscsit_handle_immediate_data( 2579 struct iscsi_cmd *cmd, 2580 struct iscsi_scsi_req *hdr, 2581 u32 length) 2582 { 2583 int iov_ret, rx_got = 0, rx_size = 0; 2584 u32 checksum, iov_count = 0, padding = 0; 2585 struct iscsi_conn *conn = cmd->conn; 2586 struct kvec *iov; 2587 2588 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2589 if (iov_ret < 0) 2590 return IMMEDIATE_DATA_CANNOT_RECOVER; 2591 2592 rx_size = length; 2593 iov_count = iov_ret; 2594 iov = &cmd->iov_data[0]; 2595 2596 padding = ((-length) & 3); 2597 if (padding != 0) { 2598 iov[iov_count].iov_base = cmd->pad_bytes; 2599 iov[iov_count++].iov_len = padding; 2600 rx_size += padding; 2601 } 2602 2603 if (conn->conn_ops->DataDigest) { 2604 iov[iov_count].iov_base = &checksum; 2605 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2606 rx_size += ISCSI_CRC_LEN; 2607 } 2608 2609 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2610 2611 iscsit_unmap_iovec(cmd); 2612 2613 if (rx_got != rx_size) { 2614 iscsit_rx_thread_wait_for_tcp(conn); 2615 return IMMEDIATE_DATA_CANNOT_RECOVER; 2616 } 2617 2618 if (conn->conn_ops->DataDigest) { 2619 u32 data_crc; 2620 2621 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2622 cmd->write_data_done, length, padding, 2623 cmd->pad_bytes); 2624 2625 if (checksum != data_crc) { 2626 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2627 " does not match computed 0x%08x\n", checksum, 2628 data_crc); 2629 2630 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2631 pr_err("Unable to recover from" 2632 " Immediate Data digest failure while" 2633 " in ERL=0.\n"); 2634 iscsit_reject_cmd(cmd, 2635 ISCSI_REASON_DATA_DIGEST_ERROR, 2636 (unsigned char *)hdr); 2637 return IMMEDIATE_DATA_CANNOT_RECOVER; 2638 } else { 2639 iscsit_reject_cmd(cmd, 2640 ISCSI_REASON_DATA_DIGEST_ERROR, 2641 (unsigned char *)hdr); 2642 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2643 } 2644 } else { 2645 pr_debug("Got CRC32C DataDigest 0x%08x for" 2646 " %u bytes of Immediate Data\n", checksum, 2647 length); 2648 } 2649 } 2650 2651 cmd->write_data_done += length; 2652 2653 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2654 spin_lock_bh(&cmd->istate_lock); 2655 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2656 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2657 spin_unlock_bh(&cmd->istate_lock); 2658 } 2659 2660 return IMMEDIATE_DATA_NORMAL_OPERATION; 2661 } 2662 2663 /* 2664 * Called with sess->conn_lock held. 2665 */ 2666 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2667 with active network interface */ 2668 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2669 { 2670 struct iscsi_cmd *cmd; 2671 struct iscsi_conn *conn_p; 2672 bool found = false; 2673 2674 /* 2675 * Only send a Asynchronous Message on connections whos network 2676 * interface is still functional. 2677 */ 2678 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2679 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2680 iscsit_inc_conn_usage_count(conn_p); 2681 found = true; 2682 break; 2683 } 2684 } 2685 2686 if (!found) 2687 return; 2688 2689 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2690 if (!cmd) { 2691 iscsit_dec_conn_usage_count(conn_p); 2692 return; 2693 } 2694 2695 cmd->logout_cid = conn->cid; 2696 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2697 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2698 2699 spin_lock_bh(&conn_p->cmd_lock); 2700 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2701 spin_unlock_bh(&conn_p->cmd_lock); 2702 2703 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2704 iscsit_dec_conn_usage_count(conn_p); 2705 } 2706 2707 static int iscsit_send_conn_drop_async_message( 2708 struct iscsi_cmd *cmd, 2709 struct iscsi_conn *conn) 2710 { 2711 struct iscsi_async *hdr; 2712 2713 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2714 2715 hdr = (struct iscsi_async *) cmd->pdu; 2716 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2717 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2718 cmd->init_task_tag = RESERVED_ITT; 2719 cmd->targ_xfer_tag = 0xFFFFFFFF; 2720 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2721 cmd->stat_sn = conn->stat_sn++; 2722 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2723 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2724 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2725 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2726 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2727 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2728 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2729 2730 pr_debug("Sending Connection Dropped Async Message StatSN:" 2731 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2732 cmd->logout_cid, conn->cid); 2733 2734 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2735 } 2736 2737 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2738 { 2739 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2740 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2741 wait_for_completion_interruptible_timeout( 2742 &conn->tx_half_close_comp, 2743 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2744 } 2745 } 2746 2747 void 2748 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2749 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2750 bool set_statsn) 2751 { 2752 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2753 hdr->flags = datain->flags; 2754 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2755 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2756 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2757 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2758 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2759 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2760 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2761 } 2762 } 2763 hton24(hdr->dlength, datain->length); 2764 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2765 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2766 (struct scsi_lun *)&hdr->lun); 2767 else 2768 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2769 2770 hdr->itt = cmd->init_task_tag; 2771 2772 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2773 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2774 else 2775 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2776 if (set_statsn) 2777 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2778 else 2779 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2780 2781 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2782 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2783 hdr->datasn = cpu_to_be32(datain->data_sn); 2784 hdr->offset = cpu_to_be32(datain->offset); 2785 2786 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2787 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2788 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2789 ntohl(hdr->offset), datain->length, conn->cid); 2790 } 2791 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2792 2793 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2794 { 2795 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2796 struct iscsi_datain datain; 2797 struct iscsi_datain_req *dr; 2798 int eodr = 0, ret; 2799 bool set_statsn = false; 2800 2801 memset(&datain, 0, sizeof(struct iscsi_datain)); 2802 dr = iscsit_get_datain_values(cmd, &datain); 2803 if (!dr) { 2804 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2805 cmd->init_task_tag); 2806 return -1; 2807 } 2808 /* 2809 * Be paranoid and double check the logic for now. 2810 */ 2811 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2812 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2813 " datain.length: %u exceeds cmd->data_length: %u\n", 2814 cmd->init_task_tag, datain.offset, datain.length, 2815 cmd->se_cmd.data_length); 2816 return -1; 2817 } 2818 2819 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2820 /* 2821 * Special case for successfully execution w/ both DATAIN 2822 * and Sense Data. 2823 */ 2824 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2825 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2826 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2827 else { 2828 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2829 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2830 iscsit_increment_maxcmdsn(cmd, conn->sess); 2831 cmd->stat_sn = conn->stat_sn++; 2832 set_statsn = true; 2833 } else if (dr->dr_complete == 2834 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2835 set_statsn = true; 2836 } 2837 2838 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2839 2840 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2841 if (ret < 0) 2842 return ret; 2843 2844 if (dr->dr_complete) { 2845 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2846 2 : 1; 2847 iscsit_free_datain_req(cmd, dr); 2848 } 2849 2850 return eodr; 2851 } 2852 2853 int 2854 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2855 struct iscsi_logout_rsp *hdr) 2856 { 2857 struct iscsi_conn *logout_conn = NULL; 2858 struct iscsi_conn_recovery *cr = NULL; 2859 struct iscsi_session *sess = conn->sess; 2860 /* 2861 * The actual shutting down of Sessions and/or Connections 2862 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2863 * is done in scsi_logout_post_handler(). 2864 */ 2865 switch (cmd->logout_reason) { 2866 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2867 pr_debug("iSCSI session logout successful, setting" 2868 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2869 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2870 break; 2871 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2872 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2873 break; 2874 /* 2875 * For CLOSECONNECTION logout requests carrying 2876 * a matching logout CID -> local CID, the reference 2877 * for the local CID will have been incremented in 2878 * iscsi_logout_closeconnection(). 2879 * 2880 * For CLOSECONNECTION logout requests carrying 2881 * a different CID than the connection it arrived 2882 * on, the connection responding to cmd->logout_cid 2883 * is stopped in iscsit_logout_post_handler_diffcid(). 2884 */ 2885 2886 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2887 " successful.\n", cmd->logout_cid, conn->cid); 2888 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2889 break; 2890 case ISCSI_LOGOUT_REASON_RECOVERY: 2891 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2892 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2893 break; 2894 /* 2895 * If the connection is still active from our point of view 2896 * force connection recovery to occur. 2897 */ 2898 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2899 cmd->logout_cid); 2900 if (logout_conn) { 2901 iscsit_connection_reinstatement_rcfr(logout_conn); 2902 iscsit_dec_conn_usage_count(logout_conn); 2903 } 2904 2905 cr = iscsit_get_inactive_connection_recovery_entry( 2906 conn->sess, cmd->logout_cid); 2907 if (!cr) { 2908 pr_err("Unable to locate CID: %hu for" 2909 " REMOVECONNFORRECOVERY Logout Request.\n", 2910 cmd->logout_cid); 2911 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2912 break; 2913 } 2914 2915 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2916 2917 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2918 " for recovery for CID: %hu on CID: %hu successful.\n", 2919 cmd->logout_cid, conn->cid); 2920 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2921 break; 2922 default: 2923 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2924 cmd->logout_reason); 2925 return -1; 2926 } 2927 2928 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2929 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2930 hdr->response = cmd->logout_response; 2931 hdr->itt = cmd->init_task_tag; 2932 cmd->stat_sn = conn->stat_sn++; 2933 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2934 2935 iscsit_increment_maxcmdsn(cmd, conn->sess); 2936 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2937 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2938 2939 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2940 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2941 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2942 cmd->logout_cid, conn->cid); 2943 2944 return 0; 2945 } 2946 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2947 2948 static int 2949 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2950 { 2951 int rc; 2952 2953 rc = iscsit_build_logout_rsp(cmd, conn, 2954 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2955 if (rc < 0) 2956 return rc; 2957 2958 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2959 } 2960 2961 void 2962 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2963 struct iscsi_nopin *hdr, bool nopout_response) 2964 { 2965 hdr->opcode = ISCSI_OP_NOOP_IN; 2966 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2967 hton24(hdr->dlength, cmd->buf_ptr_size); 2968 if (nopout_response) 2969 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2970 hdr->itt = cmd->init_task_tag; 2971 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2972 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2973 conn->stat_sn; 2974 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2975 2976 if (nopout_response) 2977 iscsit_increment_maxcmdsn(cmd, conn->sess); 2978 2979 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2980 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2981 2982 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2983 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2984 "Solicited" : "Unsolicited", cmd->init_task_tag, 2985 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2986 } 2987 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2988 2989 /* 2990 * Unsolicited NOPIN, either requesting a response or not. 2991 */ 2992 static int iscsit_send_unsolicited_nopin( 2993 struct iscsi_cmd *cmd, 2994 struct iscsi_conn *conn, 2995 int want_response) 2996 { 2997 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2998 int ret; 2999 3000 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3001 3002 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3003 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3004 3005 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3006 if (ret < 0) 3007 return ret; 3008 3009 spin_lock_bh(&cmd->istate_lock); 3010 cmd->i_state = want_response ? 3011 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3012 spin_unlock_bh(&cmd->istate_lock); 3013 3014 return 0; 3015 } 3016 3017 static int 3018 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3019 { 3020 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3021 3022 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3023 3024 /* 3025 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3026 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3027 */ 3028 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3029 3030 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3031 cmd->buf_ptr, 3032 cmd->buf_ptr_size); 3033 } 3034 3035 static int iscsit_send_r2t( 3036 struct iscsi_cmd *cmd, 3037 struct iscsi_conn *conn) 3038 { 3039 struct iscsi_r2t *r2t; 3040 struct iscsi_r2t_rsp *hdr; 3041 int ret; 3042 3043 r2t = iscsit_get_r2t_from_list(cmd); 3044 if (!r2t) 3045 return -1; 3046 3047 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3048 memset(hdr, 0, ISCSI_HDR_LEN); 3049 hdr->opcode = ISCSI_OP_R2T; 3050 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3051 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3052 (struct scsi_lun *)&hdr->lun); 3053 hdr->itt = cmd->init_task_tag; 3054 if (conn->conn_transport->iscsit_get_r2t_ttt) 3055 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3056 else 3057 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3058 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3059 hdr->statsn = cpu_to_be32(conn->stat_sn); 3060 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3061 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3062 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3063 hdr->data_offset = cpu_to_be32(r2t->offset); 3064 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3065 3066 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3067 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3068 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3069 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3070 r2t->offset, r2t->xfer_len, conn->cid); 3071 3072 spin_lock_bh(&cmd->r2t_lock); 3073 r2t->sent_r2t = 1; 3074 spin_unlock_bh(&cmd->r2t_lock); 3075 3076 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3077 if (ret < 0) { 3078 return ret; 3079 } 3080 3081 spin_lock_bh(&cmd->dataout_timeout_lock); 3082 iscsit_start_dataout_timer(cmd, conn); 3083 spin_unlock_bh(&cmd->dataout_timeout_lock); 3084 3085 return 0; 3086 } 3087 3088 /* 3089 * @recovery: If called from iscsi_task_reassign_complete_write() for 3090 * connection recovery. 3091 */ 3092 int iscsit_build_r2ts_for_cmd( 3093 struct iscsi_conn *conn, 3094 struct iscsi_cmd *cmd, 3095 bool recovery) 3096 { 3097 int first_r2t = 1; 3098 u32 offset = 0, xfer_len = 0; 3099 3100 spin_lock_bh(&cmd->r2t_lock); 3101 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3102 spin_unlock_bh(&cmd->r2t_lock); 3103 return 0; 3104 } 3105 3106 if (conn->sess->sess_ops->DataSequenceInOrder && 3107 !recovery) 3108 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3109 3110 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3111 if (conn->sess->sess_ops->DataSequenceInOrder) { 3112 offset = cmd->r2t_offset; 3113 3114 if (first_r2t && recovery) { 3115 int new_data_end = offset + 3116 conn->sess->sess_ops->MaxBurstLength - 3117 cmd->next_burst_len; 3118 3119 if (new_data_end > cmd->se_cmd.data_length) 3120 xfer_len = cmd->se_cmd.data_length - offset; 3121 else 3122 xfer_len = 3123 conn->sess->sess_ops->MaxBurstLength - 3124 cmd->next_burst_len; 3125 } else { 3126 int new_data_end = offset + 3127 conn->sess->sess_ops->MaxBurstLength; 3128 3129 if (new_data_end > cmd->se_cmd.data_length) 3130 xfer_len = cmd->se_cmd.data_length - offset; 3131 else 3132 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3133 } 3134 cmd->r2t_offset += xfer_len; 3135 3136 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3137 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3138 } else { 3139 struct iscsi_seq *seq; 3140 3141 seq = iscsit_get_seq_holder_for_r2t(cmd); 3142 if (!seq) { 3143 spin_unlock_bh(&cmd->r2t_lock); 3144 return -1; 3145 } 3146 3147 offset = seq->offset; 3148 xfer_len = seq->xfer_len; 3149 3150 if (cmd->seq_send_order == cmd->seq_count) 3151 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3152 } 3153 cmd->outstanding_r2ts++; 3154 first_r2t = 0; 3155 3156 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3157 spin_unlock_bh(&cmd->r2t_lock); 3158 return -1; 3159 } 3160 3161 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3162 break; 3163 } 3164 spin_unlock_bh(&cmd->r2t_lock); 3165 3166 return 0; 3167 } 3168 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3169 3170 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3171 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3172 { 3173 if (inc_stat_sn) 3174 cmd->stat_sn = conn->stat_sn++; 3175 3176 atomic_long_inc(&conn->sess->rsp_pdus); 3177 3178 memset(hdr, 0, ISCSI_HDR_LEN); 3179 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3180 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3181 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3182 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3183 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3184 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3185 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3186 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3187 } 3188 hdr->response = cmd->iscsi_response; 3189 hdr->cmd_status = cmd->se_cmd.scsi_status; 3190 hdr->itt = cmd->init_task_tag; 3191 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3192 3193 iscsit_increment_maxcmdsn(cmd, conn->sess); 3194 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3195 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3196 3197 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3198 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3199 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3200 cmd->se_cmd.scsi_status, conn->cid); 3201 } 3202 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3203 3204 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3205 { 3206 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3207 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3208 void *data_buf = NULL; 3209 u32 padding = 0, data_buf_len = 0; 3210 3211 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3212 3213 /* 3214 * Attach SENSE DATA payload to iSCSI Response PDU 3215 */ 3216 if (cmd->se_cmd.sense_buffer && 3217 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3218 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3219 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3220 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3221 3222 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3223 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3224 data_buf = cmd->sense_buffer; 3225 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3226 3227 if (padding) { 3228 memset(cmd->sense_buffer + 3229 cmd->se_cmd.scsi_sense_length, 0, padding); 3230 pr_debug("Adding %u bytes of padding to" 3231 " SENSE.\n", padding); 3232 } 3233 3234 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3235 " Response PDU\n", 3236 cmd->se_cmd.scsi_sense_length); 3237 } 3238 3239 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3240 data_buf_len); 3241 } 3242 3243 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3244 { 3245 switch (se_tmr->response) { 3246 case TMR_FUNCTION_COMPLETE: 3247 return ISCSI_TMF_RSP_COMPLETE; 3248 case TMR_TASK_DOES_NOT_EXIST: 3249 return ISCSI_TMF_RSP_NO_TASK; 3250 case TMR_LUN_DOES_NOT_EXIST: 3251 return ISCSI_TMF_RSP_NO_LUN; 3252 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3253 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3254 case TMR_FUNCTION_REJECTED: 3255 default: 3256 return ISCSI_TMF_RSP_REJECTED; 3257 } 3258 } 3259 3260 void 3261 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3262 struct iscsi_tm_rsp *hdr) 3263 { 3264 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3265 3266 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3267 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3268 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3269 hdr->itt = cmd->init_task_tag; 3270 cmd->stat_sn = conn->stat_sn++; 3271 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3272 3273 iscsit_increment_maxcmdsn(cmd, conn->sess); 3274 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3275 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3276 3277 pr_debug("Built Task Management Response ITT: 0x%08x," 3278 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3279 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3280 } 3281 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3282 3283 static int 3284 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3285 { 3286 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3287 3288 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3289 3290 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3291 } 3292 3293 #define SENDTARGETS_BUF_LIMIT 32768U 3294 3295 static int 3296 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3297 enum iscsit_transport_type network_transport, 3298 int skip_bytes, bool *completed) 3299 { 3300 char *payload = NULL; 3301 struct iscsi_conn *conn = cmd->conn; 3302 struct iscsi_portal_group *tpg; 3303 struct iscsi_tiqn *tiqn; 3304 struct iscsi_tpg_np *tpg_np; 3305 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3306 int target_name_printed; 3307 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3308 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3309 bool active; 3310 3311 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3312 SENDTARGETS_BUF_LIMIT); 3313 3314 payload = kzalloc(buffer_len, GFP_KERNEL); 3315 if (!payload) 3316 return -ENOMEM; 3317 3318 /* 3319 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3320 * explicit case.. 3321 */ 3322 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3323 text_ptr = strchr(text_in, '='); 3324 if (!text_ptr) { 3325 pr_err("Unable to locate '=' string in text_in:" 3326 " %s\n", text_in); 3327 kfree(payload); 3328 return -EINVAL; 3329 } 3330 /* 3331 * Skip over '=' character.. 3332 */ 3333 text_ptr += 1; 3334 } 3335 3336 spin_lock(&tiqn_lock); 3337 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3338 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3339 strcmp(tiqn->tiqn, text_ptr)) { 3340 continue; 3341 } 3342 3343 target_name_printed = 0; 3344 3345 spin_lock(&tiqn->tiqn_tpg_lock); 3346 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3347 3348 /* If demo_mode_discovery=0 and generate_node_acls=0 3349 * (demo mode dislabed) do not return 3350 * TargetName+TargetAddress unless a NodeACL exists. 3351 */ 3352 3353 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3354 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3355 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3356 cmd->conn->sess->sess_ops->InitiatorName))) { 3357 continue; 3358 } 3359 3360 spin_lock(&tpg->tpg_state_lock); 3361 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3362 spin_unlock(&tpg->tpg_state_lock); 3363 3364 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3365 continue; 3366 3367 spin_lock(&tpg->tpg_np_lock); 3368 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3369 tpg_np_list) { 3370 struct iscsi_np *np = tpg_np->tpg_np; 3371 struct sockaddr_storage *sockaddr; 3372 3373 if (np->np_network_transport != network_transport) 3374 continue; 3375 3376 if (!target_name_printed) { 3377 len = sprintf(buf, "TargetName=%s", 3378 tiqn->tiqn); 3379 len += 1; 3380 3381 if ((len + payload_len) > buffer_len) { 3382 spin_unlock(&tpg->tpg_np_lock); 3383 spin_unlock(&tiqn->tiqn_tpg_lock); 3384 end_of_buf = 1; 3385 goto eob; 3386 } 3387 3388 if (skip_bytes && len <= skip_bytes) { 3389 skip_bytes -= len; 3390 } else { 3391 memcpy(payload + payload_len, buf, len); 3392 payload_len += len; 3393 target_name_printed = 1; 3394 if (len > skip_bytes) 3395 skip_bytes = 0; 3396 } 3397 } 3398 3399 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3400 sockaddr = &conn->local_sockaddr; 3401 else 3402 sockaddr = &np->np_sockaddr; 3403 3404 len = sprintf(buf, "TargetAddress=" 3405 "%pISpc,%hu", 3406 sockaddr, 3407 tpg->tpgt); 3408 len += 1; 3409 3410 if ((len + payload_len) > buffer_len) { 3411 spin_unlock(&tpg->tpg_np_lock); 3412 spin_unlock(&tiqn->tiqn_tpg_lock); 3413 end_of_buf = 1; 3414 goto eob; 3415 } 3416 3417 if (skip_bytes && len <= skip_bytes) { 3418 skip_bytes -= len; 3419 } else { 3420 memcpy(payload + payload_len, buf, len); 3421 payload_len += len; 3422 if (len > skip_bytes) 3423 skip_bytes = 0; 3424 } 3425 } 3426 spin_unlock(&tpg->tpg_np_lock); 3427 } 3428 spin_unlock(&tiqn->tiqn_tpg_lock); 3429 eob: 3430 if (end_of_buf) { 3431 *completed = false; 3432 break; 3433 } 3434 3435 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3436 break; 3437 } 3438 spin_unlock(&tiqn_lock); 3439 3440 cmd->buf_ptr = payload; 3441 3442 return payload_len; 3443 } 3444 3445 int 3446 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3447 struct iscsi_text_rsp *hdr, 3448 enum iscsit_transport_type network_transport) 3449 { 3450 int text_length, padding; 3451 bool completed = true; 3452 3453 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3454 cmd->read_data_done, 3455 &completed); 3456 if (text_length < 0) 3457 return text_length; 3458 3459 if (completed) { 3460 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3461 } else { 3462 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3463 cmd->read_data_done += text_length; 3464 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3465 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3466 } 3467 hdr->opcode = ISCSI_OP_TEXT_RSP; 3468 padding = ((-text_length) & 3); 3469 hton24(hdr->dlength, text_length); 3470 hdr->itt = cmd->init_task_tag; 3471 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3472 cmd->stat_sn = conn->stat_sn++; 3473 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3474 3475 iscsit_increment_maxcmdsn(cmd, conn->sess); 3476 /* 3477 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3478 * correctly increment MaxCmdSN for each response answering a 3479 * non immediate text request with a valid CmdSN. 3480 */ 3481 cmd->maxcmdsn_inc = 0; 3482 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3483 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3484 3485 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3486 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3487 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3488 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3489 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3490 3491 return text_length + padding; 3492 } 3493 EXPORT_SYMBOL(iscsit_build_text_rsp); 3494 3495 static int iscsit_send_text_rsp( 3496 struct iscsi_cmd *cmd, 3497 struct iscsi_conn *conn) 3498 { 3499 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3500 int text_length; 3501 3502 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3503 conn->conn_transport->transport_type); 3504 if (text_length < 0) 3505 return text_length; 3506 3507 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3508 cmd->buf_ptr, 3509 text_length); 3510 } 3511 3512 void 3513 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3514 struct iscsi_reject *hdr) 3515 { 3516 hdr->opcode = ISCSI_OP_REJECT; 3517 hdr->reason = cmd->reject_reason; 3518 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3519 hton24(hdr->dlength, ISCSI_HDR_LEN); 3520 hdr->ffffffff = cpu_to_be32(0xffffffff); 3521 cmd->stat_sn = conn->stat_sn++; 3522 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3523 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3524 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3525 3526 } 3527 EXPORT_SYMBOL(iscsit_build_reject); 3528 3529 static int iscsit_send_reject( 3530 struct iscsi_cmd *cmd, 3531 struct iscsi_conn *conn) 3532 { 3533 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3534 3535 iscsit_build_reject(cmd, conn, hdr); 3536 3537 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3538 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3539 3540 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3541 cmd->buf_ptr, 3542 ISCSI_HDR_LEN); 3543 } 3544 3545 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3546 { 3547 int ord, cpu; 3548 /* 3549 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3550 * within iscsit_start_kthreads() 3551 * 3552 * Here we use bitmap_id to determine which CPU that this 3553 * iSCSI connection's RX/TX threads will be scheduled to 3554 * execute upon. 3555 */ 3556 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3557 for_each_online_cpu(cpu) { 3558 if (ord-- == 0) { 3559 cpumask_set_cpu(cpu, conn->conn_cpumask); 3560 return; 3561 } 3562 } 3563 /* 3564 * This should never be reached.. 3565 */ 3566 dump_stack(); 3567 cpumask_setall(conn->conn_cpumask); 3568 } 3569 3570 int 3571 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3572 { 3573 int ret; 3574 3575 switch (state) { 3576 case ISTATE_SEND_R2T: 3577 ret = iscsit_send_r2t(cmd, conn); 3578 if (ret < 0) 3579 goto err; 3580 break; 3581 case ISTATE_REMOVE: 3582 spin_lock_bh(&conn->cmd_lock); 3583 list_del_init(&cmd->i_conn_node); 3584 spin_unlock_bh(&conn->cmd_lock); 3585 3586 iscsit_free_cmd(cmd, false); 3587 break; 3588 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3589 iscsit_mod_nopin_response_timer(conn); 3590 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3591 if (ret < 0) 3592 goto err; 3593 break; 3594 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3595 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3596 if (ret < 0) 3597 goto err; 3598 break; 3599 default: 3600 pr_err("Unknown Opcode: 0x%02x ITT:" 3601 " 0x%08x, i_state: %d on CID: %hu\n", 3602 cmd->iscsi_opcode, cmd->init_task_tag, state, 3603 conn->cid); 3604 goto err; 3605 } 3606 3607 return 0; 3608 3609 err: 3610 return -1; 3611 } 3612 EXPORT_SYMBOL(iscsit_immediate_queue); 3613 3614 static int 3615 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3616 { 3617 struct iscsit_transport *t = conn->conn_transport; 3618 struct iscsi_queue_req *qr; 3619 struct iscsi_cmd *cmd; 3620 u8 state; 3621 int ret; 3622 3623 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3624 atomic_set(&conn->check_immediate_queue, 0); 3625 cmd = qr->cmd; 3626 state = qr->state; 3627 kmem_cache_free(lio_qr_cache, qr); 3628 3629 ret = t->iscsit_immediate_queue(conn, cmd, state); 3630 if (ret < 0) 3631 return ret; 3632 } 3633 3634 return 0; 3635 } 3636 3637 int 3638 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3639 { 3640 int ret; 3641 3642 check_rsp_state: 3643 switch (state) { 3644 case ISTATE_SEND_DATAIN: 3645 ret = iscsit_send_datain(cmd, conn); 3646 if (ret < 0) 3647 goto err; 3648 else if (!ret) 3649 /* more drs */ 3650 goto check_rsp_state; 3651 else if (ret == 1) { 3652 /* all done */ 3653 spin_lock_bh(&cmd->istate_lock); 3654 cmd->i_state = ISTATE_SENT_STATUS; 3655 spin_unlock_bh(&cmd->istate_lock); 3656 3657 if (atomic_read(&conn->check_immediate_queue)) 3658 return 1; 3659 3660 return 0; 3661 } else if (ret == 2) { 3662 /* Still must send status, 3663 SCF_TRANSPORT_TASK_SENSE was set */ 3664 spin_lock_bh(&cmd->istate_lock); 3665 cmd->i_state = ISTATE_SEND_STATUS; 3666 spin_unlock_bh(&cmd->istate_lock); 3667 state = ISTATE_SEND_STATUS; 3668 goto check_rsp_state; 3669 } 3670 3671 break; 3672 case ISTATE_SEND_STATUS: 3673 case ISTATE_SEND_STATUS_RECOVERY: 3674 ret = iscsit_send_response(cmd, conn); 3675 break; 3676 case ISTATE_SEND_LOGOUTRSP: 3677 ret = iscsit_send_logout(cmd, conn); 3678 break; 3679 case ISTATE_SEND_ASYNCMSG: 3680 ret = iscsit_send_conn_drop_async_message( 3681 cmd, conn); 3682 break; 3683 case ISTATE_SEND_NOPIN: 3684 ret = iscsit_send_nopin(cmd, conn); 3685 break; 3686 case ISTATE_SEND_REJECT: 3687 ret = iscsit_send_reject(cmd, conn); 3688 break; 3689 case ISTATE_SEND_TASKMGTRSP: 3690 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3691 if (ret != 0) 3692 break; 3693 ret = iscsit_tmr_post_handler(cmd, conn); 3694 if (ret != 0) 3695 iscsit_fall_back_to_erl0(conn->sess); 3696 break; 3697 case ISTATE_SEND_TEXTRSP: 3698 ret = iscsit_send_text_rsp(cmd, conn); 3699 break; 3700 default: 3701 pr_err("Unknown Opcode: 0x%02x ITT:" 3702 " 0x%08x, i_state: %d on CID: %hu\n", 3703 cmd->iscsi_opcode, cmd->init_task_tag, 3704 state, conn->cid); 3705 goto err; 3706 } 3707 if (ret < 0) 3708 goto err; 3709 3710 switch (state) { 3711 case ISTATE_SEND_LOGOUTRSP: 3712 if (!iscsit_logout_post_handler(cmd, conn)) 3713 return -ECONNRESET; 3714 /* fall through */ 3715 case ISTATE_SEND_STATUS: 3716 case ISTATE_SEND_ASYNCMSG: 3717 case ISTATE_SEND_NOPIN: 3718 case ISTATE_SEND_STATUS_RECOVERY: 3719 case ISTATE_SEND_TEXTRSP: 3720 case ISTATE_SEND_TASKMGTRSP: 3721 case ISTATE_SEND_REJECT: 3722 spin_lock_bh(&cmd->istate_lock); 3723 cmd->i_state = ISTATE_SENT_STATUS; 3724 spin_unlock_bh(&cmd->istate_lock); 3725 break; 3726 default: 3727 pr_err("Unknown Opcode: 0x%02x ITT:" 3728 " 0x%08x, i_state: %d on CID: %hu\n", 3729 cmd->iscsi_opcode, cmd->init_task_tag, 3730 cmd->i_state, conn->cid); 3731 goto err; 3732 } 3733 3734 if (atomic_read(&conn->check_immediate_queue)) 3735 return 1; 3736 3737 return 0; 3738 3739 err: 3740 return -1; 3741 } 3742 EXPORT_SYMBOL(iscsit_response_queue); 3743 3744 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3745 { 3746 struct iscsit_transport *t = conn->conn_transport; 3747 struct iscsi_queue_req *qr; 3748 struct iscsi_cmd *cmd; 3749 u8 state; 3750 int ret; 3751 3752 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3753 cmd = qr->cmd; 3754 state = qr->state; 3755 kmem_cache_free(lio_qr_cache, qr); 3756 3757 ret = t->iscsit_response_queue(conn, cmd, state); 3758 if (ret == 1 || ret < 0) 3759 return ret; 3760 } 3761 3762 return 0; 3763 } 3764 3765 int iscsi_target_tx_thread(void *arg) 3766 { 3767 int ret = 0; 3768 struct iscsi_conn *conn = arg; 3769 bool conn_freed = false; 3770 3771 /* 3772 * Allow ourselves to be interrupted by SIGINT so that a 3773 * connection recovery / failure event can be triggered externally. 3774 */ 3775 allow_signal(SIGINT); 3776 3777 while (!kthread_should_stop()) { 3778 /* 3779 * Ensure that both TX and RX per connection kthreads 3780 * are scheduled to run on the same CPU. 3781 */ 3782 iscsit_thread_check_cpumask(conn, current, 1); 3783 3784 wait_event_interruptible(conn->queues_wq, 3785 !iscsit_conn_all_queues_empty(conn)); 3786 3787 if (signal_pending(current)) 3788 goto transport_err; 3789 3790 get_immediate: 3791 ret = iscsit_handle_immediate_queue(conn); 3792 if (ret < 0) 3793 goto transport_err; 3794 3795 ret = iscsit_handle_response_queue(conn); 3796 if (ret == 1) { 3797 goto get_immediate; 3798 } else if (ret == -ECONNRESET) { 3799 conn_freed = true; 3800 goto out; 3801 } else if (ret < 0) { 3802 goto transport_err; 3803 } 3804 } 3805 3806 transport_err: 3807 /* 3808 * Avoid the normal connection failure code-path if this connection 3809 * is still within LOGIN mode, and iscsi_np process context is 3810 * responsible for cleaning up the early connection failure. 3811 */ 3812 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3813 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3814 out: 3815 if (!conn_freed) { 3816 while (!kthread_should_stop()) { 3817 msleep(100); 3818 } 3819 } 3820 return 0; 3821 } 3822 3823 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3824 { 3825 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3826 struct iscsi_cmd *cmd; 3827 int ret = 0; 3828 3829 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3830 case ISCSI_OP_SCSI_CMD: 3831 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3832 if (!cmd) 3833 goto reject; 3834 3835 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3836 break; 3837 case ISCSI_OP_SCSI_DATA_OUT: 3838 ret = iscsit_handle_data_out(conn, buf); 3839 break; 3840 case ISCSI_OP_NOOP_OUT: 3841 cmd = NULL; 3842 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3843 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3844 if (!cmd) 3845 goto reject; 3846 } 3847 ret = iscsit_handle_nop_out(conn, cmd, buf); 3848 break; 3849 case ISCSI_OP_SCSI_TMFUNC: 3850 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3851 if (!cmd) 3852 goto reject; 3853 3854 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3855 break; 3856 case ISCSI_OP_TEXT: 3857 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3858 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3859 if (!cmd) 3860 goto reject; 3861 } else { 3862 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3863 if (!cmd) 3864 goto reject; 3865 } 3866 3867 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3868 break; 3869 case ISCSI_OP_LOGOUT: 3870 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3871 if (!cmd) 3872 goto reject; 3873 3874 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3875 if (ret > 0) 3876 wait_for_completion_timeout(&conn->conn_logout_comp, 3877 SECONDS_FOR_LOGOUT_COMP * HZ); 3878 break; 3879 case ISCSI_OP_SNACK: 3880 ret = iscsit_handle_snack(conn, buf); 3881 break; 3882 default: 3883 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3884 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3885 pr_err("Cannot recover from unknown" 3886 " opcode while ERL=0, closing iSCSI connection.\n"); 3887 return -1; 3888 } 3889 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3890 " closing iSCSI connection.\n"); 3891 ret = -1; 3892 break; 3893 } 3894 3895 return ret; 3896 reject: 3897 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3898 } 3899 3900 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3901 { 3902 bool ret; 3903 3904 spin_lock_bh(&conn->state_lock); 3905 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3906 spin_unlock_bh(&conn->state_lock); 3907 3908 return ret; 3909 } 3910 3911 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3912 { 3913 int ret; 3914 u8 *buffer, opcode; 3915 u32 checksum = 0, digest = 0; 3916 struct kvec iov; 3917 3918 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 3919 if (!buffer) 3920 return; 3921 3922 while (!kthread_should_stop()) { 3923 /* 3924 * Ensure that both TX and RX per connection kthreads 3925 * are scheduled to run on the same CPU. 3926 */ 3927 iscsit_thread_check_cpumask(conn, current, 0); 3928 3929 memset(&iov, 0, sizeof(struct kvec)); 3930 3931 iov.iov_base = buffer; 3932 iov.iov_len = ISCSI_HDR_LEN; 3933 3934 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3935 if (ret != ISCSI_HDR_LEN) { 3936 iscsit_rx_thread_wait_for_tcp(conn); 3937 break; 3938 } 3939 3940 if (conn->conn_ops->HeaderDigest) { 3941 iov.iov_base = &digest; 3942 iov.iov_len = ISCSI_CRC_LEN; 3943 3944 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3945 if (ret != ISCSI_CRC_LEN) { 3946 iscsit_rx_thread_wait_for_tcp(conn); 3947 break; 3948 } 3949 3950 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3951 ISCSI_HDR_LEN, 0, NULL, 3952 &checksum); 3953 3954 if (digest != checksum) { 3955 pr_err("HeaderDigest CRC32C failed," 3956 " received 0x%08x, computed 0x%08x\n", 3957 digest, checksum); 3958 /* 3959 * Set the PDU to 0xff so it will intentionally 3960 * hit default in the switch below. 3961 */ 3962 memset(buffer, 0xff, ISCSI_HDR_LEN); 3963 atomic_long_inc(&conn->sess->conn_digest_errors); 3964 } else { 3965 pr_debug("Got HeaderDigest CRC32C" 3966 " 0x%08x\n", checksum); 3967 } 3968 } 3969 3970 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3971 break; 3972 3973 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3974 3975 if (conn->sess->sess_ops->SessionType && 3976 ((!(opcode & ISCSI_OP_TEXT)) || 3977 (!(opcode & ISCSI_OP_LOGOUT)))) { 3978 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3979 " while in Discovery Session, rejecting.\n", opcode); 3980 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 3981 buffer); 3982 break; 3983 } 3984 3985 ret = iscsi_target_rx_opcode(conn, buffer); 3986 if (ret < 0) 3987 break; 3988 } 3989 3990 kfree(buffer); 3991 } 3992 3993 int iscsi_target_rx_thread(void *arg) 3994 { 3995 int rc; 3996 struct iscsi_conn *conn = arg; 3997 bool conn_freed = false; 3998 3999 /* 4000 * Allow ourselves to be interrupted by SIGINT so that a 4001 * connection recovery / failure event can be triggered externally. 4002 */ 4003 allow_signal(SIGINT); 4004 /* 4005 * Wait for iscsi_post_login_handler() to complete before allowing 4006 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4007 */ 4008 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4009 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4010 goto out; 4011 4012 if (!conn->conn_transport->iscsit_get_rx_pdu) 4013 return 0; 4014 4015 conn->conn_transport->iscsit_get_rx_pdu(conn); 4016 4017 if (!signal_pending(current)) 4018 atomic_set(&conn->transport_failed, 1); 4019 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4020 4021 out: 4022 if (!conn_freed) { 4023 while (!kthread_should_stop()) { 4024 msleep(100); 4025 } 4026 } 4027 4028 return 0; 4029 } 4030 4031 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4032 { 4033 LIST_HEAD(tmp_list); 4034 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4035 struct iscsi_session *sess = conn->sess; 4036 /* 4037 * We expect this function to only ever be called from either RX or TX 4038 * thread context via iscsit_close_connection() once the other context 4039 * has been reset -> returned sleeping pre-handler state. 4040 */ 4041 spin_lock_bh(&conn->cmd_lock); 4042 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4043 4044 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4045 struct se_cmd *se_cmd = &cmd->se_cmd; 4046 4047 if (se_cmd->se_tfo != NULL) { 4048 spin_lock(&se_cmd->t_state_lock); 4049 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4050 spin_unlock(&se_cmd->t_state_lock); 4051 } 4052 } 4053 spin_unlock_bh(&conn->cmd_lock); 4054 4055 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4056 list_del_init(&cmd->i_conn_node); 4057 4058 iscsit_increment_maxcmdsn(cmd, sess); 4059 iscsit_free_cmd(cmd, true); 4060 4061 } 4062 } 4063 4064 static void iscsit_stop_timers_for_cmds( 4065 struct iscsi_conn *conn) 4066 { 4067 struct iscsi_cmd *cmd; 4068 4069 spin_lock_bh(&conn->cmd_lock); 4070 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4071 if (cmd->data_direction == DMA_TO_DEVICE) 4072 iscsit_stop_dataout_timer(cmd); 4073 } 4074 spin_unlock_bh(&conn->cmd_lock); 4075 } 4076 4077 int iscsit_close_connection( 4078 struct iscsi_conn *conn) 4079 { 4080 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4081 struct iscsi_session *sess = conn->sess; 4082 4083 pr_debug("Closing iSCSI connection CID %hu on SID:" 4084 " %u\n", conn->cid, sess->sid); 4085 /* 4086 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4087 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4088 * sleeping and the logout response never got sent because the 4089 * connection failed. 4090 * 4091 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4092 * to signal logout response TX interrupt completion. Go ahead and skip 4093 * this for iser since isert_rx_opcode() does not wait on logout failure, 4094 * and to avoid iscsi_conn pointer dereference in iser-target code. 4095 */ 4096 if (!conn->conn_transport->rdma_shutdown) 4097 complete(&conn->conn_logout_comp); 4098 4099 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4100 if (conn->tx_thread && 4101 cmpxchg(&conn->tx_thread_active, true, false)) { 4102 send_sig(SIGINT, conn->tx_thread, 1); 4103 kthread_stop(conn->tx_thread); 4104 } 4105 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4106 if (conn->rx_thread && 4107 cmpxchg(&conn->rx_thread_active, true, false)) { 4108 send_sig(SIGINT, conn->rx_thread, 1); 4109 kthread_stop(conn->rx_thread); 4110 } 4111 } 4112 4113 spin_lock(&iscsit_global->ts_bitmap_lock); 4114 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4115 get_order(1)); 4116 spin_unlock(&iscsit_global->ts_bitmap_lock); 4117 4118 iscsit_stop_timers_for_cmds(conn); 4119 iscsit_stop_nopin_response_timer(conn); 4120 iscsit_stop_nopin_timer(conn); 4121 4122 if (conn->conn_transport->iscsit_wait_conn) 4123 conn->conn_transport->iscsit_wait_conn(conn); 4124 4125 /* 4126 * During Connection recovery drop unacknowledged out of order 4127 * commands for this connection, and prepare the other commands 4128 * for reallegiance. 4129 * 4130 * During normal operation clear the out of order commands (but 4131 * do not free the struct iscsi_ooo_cmdsn's) and release all 4132 * struct iscsi_cmds. 4133 */ 4134 if (atomic_read(&conn->connection_recovery)) { 4135 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4136 iscsit_prepare_cmds_for_reallegiance(conn); 4137 } else { 4138 iscsit_clear_ooo_cmdsns_for_conn(conn); 4139 iscsit_release_commands_from_conn(conn); 4140 } 4141 iscsit_free_queue_reqs_for_conn(conn); 4142 4143 /* 4144 * Handle decrementing session or connection usage count if 4145 * a logout response was not able to be sent because the 4146 * connection failed. Fall back to Session Recovery here. 4147 */ 4148 if (atomic_read(&conn->conn_logout_remove)) { 4149 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4150 iscsit_dec_conn_usage_count(conn); 4151 iscsit_dec_session_usage_count(sess); 4152 } 4153 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4154 iscsit_dec_conn_usage_count(conn); 4155 4156 atomic_set(&conn->conn_logout_remove, 0); 4157 atomic_set(&sess->session_reinstatement, 0); 4158 atomic_set(&sess->session_fall_back_to_erl0, 1); 4159 } 4160 4161 spin_lock_bh(&sess->conn_lock); 4162 list_del(&conn->conn_list); 4163 4164 /* 4165 * Attempt to let the Initiator know this connection failed by 4166 * sending an Connection Dropped Async Message on another 4167 * active connection. 4168 */ 4169 if (atomic_read(&conn->connection_recovery)) 4170 iscsit_build_conn_drop_async_message(conn); 4171 4172 spin_unlock_bh(&sess->conn_lock); 4173 4174 /* 4175 * If connection reinstatement is being performed on this connection, 4176 * up the connection reinstatement semaphore that is being blocked on 4177 * in iscsit_cause_connection_reinstatement(). 4178 */ 4179 spin_lock_bh(&conn->state_lock); 4180 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4181 spin_unlock_bh(&conn->state_lock); 4182 complete(&conn->conn_wait_comp); 4183 wait_for_completion(&conn->conn_post_wait_comp); 4184 spin_lock_bh(&conn->state_lock); 4185 } 4186 4187 /* 4188 * If connection reinstatement is being performed on this connection 4189 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4190 * connection wait rcfr semaphore that is being blocked on 4191 * an iscsit_connection_reinstatement_rcfr(). 4192 */ 4193 if (atomic_read(&conn->connection_wait_rcfr)) { 4194 spin_unlock_bh(&conn->state_lock); 4195 complete(&conn->conn_wait_rcfr_comp); 4196 wait_for_completion(&conn->conn_post_wait_comp); 4197 spin_lock_bh(&conn->state_lock); 4198 } 4199 atomic_set(&conn->connection_reinstatement, 1); 4200 spin_unlock_bh(&conn->state_lock); 4201 4202 /* 4203 * If any other processes are accessing this connection pointer we 4204 * must wait until they have completed. 4205 */ 4206 iscsit_check_conn_usage_count(conn); 4207 4208 ahash_request_free(conn->conn_tx_hash); 4209 if (conn->conn_rx_hash) { 4210 struct crypto_ahash *tfm; 4211 4212 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4213 ahash_request_free(conn->conn_rx_hash); 4214 crypto_free_ahash(tfm); 4215 } 4216 4217 if (conn->sock) 4218 sock_release(conn->sock); 4219 4220 if (conn->conn_transport->iscsit_free_conn) 4221 conn->conn_transport->iscsit_free_conn(conn); 4222 4223 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4224 conn->conn_state = TARG_CONN_STATE_FREE; 4225 iscsit_free_conn(conn); 4226 4227 spin_lock_bh(&sess->conn_lock); 4228 atomic_dec(&sess->nconn); 4229 pr_debug("Decremented iSCSI connection count to %hu from node:" 4230 " %s\n", atomic_read(&sess->nconn), 4231 sess->sess_ops->InitiatorName); 4232 /* 4233 * Make sure that if one connection fails in an non ERL=2 iSCSI 4234 * Session that they all fail. 4235 */ 4236 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4237 !atomic_read(&sess->session_logout)) 4238 atomic_set(&sess->session_fall_back_to_erl0, 1); 4239 4240 /* 4241 * If this was not the last connection in the session, and we are 4242 * performing session reinstatement or falling back to ERL=0, call 4243 * iscsit_stop_session() without sleeping to shutdown the other 4244 * active connections. 4245 */ 4246 if (atomic_read(&sess->nconn)) { 4247 if (!atomic_read(&sess->session_reinstatement) && 4248 !atomic_read(&sess->session_fall_back_to_erl0)) { 4249 spin_unlock_bh(&sess->conn_lock); 4250 return 0; 4251 } 4252 if (!atomic_read(&sess->session_stop_active)) { 4253 atomic_set(&sess->session_stop_active, 1); 4254 spin_unlock_bh(&sess->conn_lock); 4255 iscsit_stop_session(sess, 0, 0); 4256 return 0; 4257 } 4258 spin_unlock_bh(&sess->conn_lock); 4259 return 0; 4260 } 4261 4262 /* 4263 * If this was the last connection in the session and one of the 4264 * following is occurring: 4265 * 4266 * Session Reinstatement is not being performed, and are falling back 4267 * to ERL=0 call iscsit_close_session(). 4268 * 4269 * Session Logout was requested. iscsit_close_session() will be called 4270 * elsewhere. 4271 * 4272 * Session Continuation is not being performed, start the Time2Retain 4273 * handler and check if sleep_on_sess_wait_sem is active. 4274 */ 4275 if (!atomic_read(&sess->session_reinstatement) && 4276 atomic_read(&sess->session_fall_back_to_erl0)) { 4277 spin_unlock_bh(&sess->conn_lock); 4278 iscsit_close_session(sess); 4279 4280 return 0; 4281 } else if (atomic_read(&sess->session_logout)) { 4282 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4283 sess->session_state = TARG_SESS_STATE_FREE; 4284 spin_unlock_bh(&sess->conn_lock); 4285 4286 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4287 complete(&sess->session_wait_comp); 4288 4289 return 0; 4290 } else { 4291 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4292 sess->session_state = TARG_SESS_STATE_FAILED; 4293 4294 if (!atomic_read(&sess->session_continuation)) { 4295 spin_unlock_bh(&sess->conn_lock); 4296 iscsit_start_time2retain_handler(sess); 4297 } else 4298 spin_unlock_bh(&sess->conn_lock); 4299 4300 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4301 complete(&sess->session_wait_comp); 4302 4303 return 0; 4304 } 4305 } 4306 4307 /* 4308 * If the iSCSI Session for the iSCSI Initiator Node exists, 4309 * forcefully shutdown the iSCSI NEXUS. 4310 */ 4311 int iscsit_close_session(struct iscsi_session *sess) 4312 { 4313 struct iscsi_portal_group *tpg = sess->tpg; 4314 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4315 4316 if (atomic_read(&sess->nconn)) { 4317 pr_err("%d connection(s) still exist for iSCSI session" 4318 " to %s\n", atomic_read(&sess->nconn), 4319 sess->sess_ops->InitiatorName); 4320 BUG(); 4321 } 4322 4323 spin_lock_bh(&se_tpg->session_lock); 4324 atomic_set(&sess->session_logout, 1); 4325 atomic_set(&sess->session_reinstatement, 1); 4326 iscsit_stop_time2retain_timer(sess); 4327 spin_unlock_bh(&se_tpg->session_lock); 4328 4329 /* 4330 * transport_deregister_session_configfs() will clear the 4331 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4332 * can be setting it again with __transport_register_session() in 4333 * iscsi_post_login_handler() again after the iscsit_stop_session() 4334 * completes in iscsi_np context. 4335 */ 4336 transport_deregister_session_configfs(sess->se_sess); 4337 4338 /* 4339 * If any other processes are accessing this session pointer we must 4340 * wait until they have completed. If we are in an interrupt (the 4341 * time2retain handler) and contain and active session usage count we 4342 * restart the timer and exit. 4343 */ 4344 if (!in_interrupt()) { 4345 if (iscsit_check_session_usage_count(sess) == 1) 4346 iscsit_stop_session(sess, 1, 1); 4347 } else { 4348 if (iscsit_check_session_usage_count(sess) == 2) { 4349 atomic_set(&sess->session_logout, 0); 4350 iscsit_start_time2retain_handler(sess); 4351 return 0; 4352 } 4353 } 4354 4355 transport_deregister_session(sess->se_sess); 4356 4357 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4358 iscsit_free_connection_recovery_entires(sess); 4359 4360 iscsit_free_all_ooo_cmdsns(sess); 4361 4362 spin_lock_bh(&se_tpg->session_lock); 4363 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4364 sess->session_state = TARG_SESS_STATE_FREE; 4365 pr_debug("Released iSCSI session from node: %s\n", 4366 sess->sess_ops->InitiatorName); 4367 tpg->nsessions--; 4368 if (tpg->tpg_tiqn) 4369 tpg->tpg_tiqn->tiqn_nsessions--; 4370 4371 pr_debug("Decremented number of active iSCSI Sessions on" 4372 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4373 4374 ida_free(&sess_ida, sess->session_index); 4375 kfree(sess->sess_ops); 4376 sess->sess_ops = NULL; 4377 spin_unlock_bh(&se_tpg->session_lock); 4378 4379 kfree(sess); 4380 return 0; 4381 } 4382 4383 static void iscsit_logout_post_handler_closesession( 4384 struct iscsi_conn *conn) 4385 { 4386 struct iscsi_session *sess = conn->sess; 4387 int sleep = 1; 4388 /* 4389 * Traditional iscsi/tcp will invoke this logic from TX thread 4390 * context during session logout, so clear tx_thread_active and 4391 * sleep if iscsit_close_connection() has not already occured. 4392 * 4393 * Since iser-target invokes this logic from it's own workqueue, 4394 * always sleep waiting for RX/TX thread shutdown to complete 4395 * within iscsit_close_connection(). 4396 */ 4397 if (!conn->conn_transport->rdma_shutdown) { 4398 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4399 if (!sleep) 4400 return; 4401 } 4402 4403 atomic_set(&conn->conn_logout_remove, 0); 4404 complete(&conn->conn_logout_comp); 4405 4406 iscsit_dec_conn_usage_count(conn); 4407 iscsit_stop_session(sess, sleep, sleep); 4408 iscsit_dec_session_usage_count(sess); 4409 iscsit_close_session(sess); 4410 } 4411 4412 static void iscsit_logout_post_handler_samecid( 4413 struct iscsi_conn *conn) 4414 { 4415 int sleep = 1; 4416 4417 if (!conn->conn_transport->rdma_shutdown) { 4418 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4419 if (!sleep) 4420 return; 4421 } 4422 4423 atomic_set(&conn->conn_logout_remove, 0); 4424 complete(&conn->conn_logout_comp); 4425 4426 iscsit_cause_connection_reinstatement(conn, sleep); 4427 iscsit_dec_conn_usage_count(conn); 4428 } 4429 4430 static void iscsit_logout_post_handler_diffcid( 4431 struct iscsi_conn *conn, 4432 u16 cid) 4433 { 4434 struct iscsi_conn *l_conn; 4435 struct iscsi_session *sess = conn->sess; 4436 bool conn_found = false; 4437 4438 if (!sess) 4439 return; 4440 4441 spin_lock_bh(&sess->conn_lock); 4442 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4443 if (l_conn->cid == cid) { 4444 iscsit_inc_conn_usage_count(l_conn); 4445 conn_found = true; 4446 break; 4447 } 4448 } 4449 spin_unlock_bh(&sess->conn_lock); 4450 4451 if (!conn_found) 4452 return; 4453 4454 if (l_conn->sock) 4455 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4456 4457 spin_lock_bh(&l_conn->state_lock); 4458 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4459 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4460 spin_unlock_bh(&l_conn->state_lock); 4461 4462 iscsit_cause_connection_reinstatement(l_conn, 1); 4463 iscsit_dec_conn_usage_count(l_conn); 4464 } 4465 4466 /* 4467 * Return of 0 causes the TX thread to restart. 4468 */ 4469 int iscsit_logout_post_handler( 4470 struct iscsi_cmd *cmd, 4471 struct iscsi_conn *conn) 4472 { 4473 int ret = 0; 4474 4475 switch (cmd->logout_reason) { 4476 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4477 switch (cmd->logout_response) { 4478 case ISCSI_LOGOUT_SUCCESS: 4479 case ISCSI_LOGOUT_CLEANUP_FAILED: 4480 default: 4481 iscsit_logout_post_handler_closesession(conn); 4482 break; 4483 } 4484 ret = 0; 4485 break; 4486 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4487 if (conn->cid == cmd->logout_cid) { 4488 switch (cmd->logout_response) { 4489 case ISCSI_LOGOUT_SUCCESS: 4490 case ISCSI_LOGOUT_CLEANUP_FAILED: 4491 default: 4492 iscsit_logout_post_handler_samecid(conn); 4493 break; 4494 } 4495 ret = 0; 4496 } else { 4497 switch (cmd->logout_response) { 4498 case ISCSI_LOGOUT_SUCCESS: 4499 iscsit_logout_post_handler_diffcid(conn, 4500 cmd->logout_cid); 4501 break; 4502 case ISCSI_LOGOUT_CID_NOT_FOUND: 4503 case ISCSI_LOGOUT_CLEANUP_FAILED: 4504 default: 4505 break; 4506 } 4507 ret = 1; 4508 } 4509 break; 4510 case ISCSI_LOGOUT_REASON_RECOVERY: 4511 switch (cmd->logout_response) { 4512 case ISCSI_LOGOUT_SUCCESS: 4513 case ISCSI_LOGOUT_CID_NOT_FOUND: 4514 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4515 case ISCSI_LOGOUT_CLEANUP_FAILED: 4516 default: 4517 break; 4518 } 4519 ret = 1; 4520 break; 4521 default: 4522 break; 4523 4524 } 4525 return ret; 4526 } 4527 EXPORT_SYMBOL(iscsit_logout_post_handler); 4528 4529 void iscsit_fail_session(struct iscsi_session *sess) 4530 { 4531 struct iscsi_conn *conn; 4532 4533 spin_lock_bh(&sess->conn_lock); 4534 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4535 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4536 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4537 } 4538 spin_unlock_bh(&sess->conn_lock); 4539 4540 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4541 sess->session_state = TARG_SESS_STATE_FAILED; 4542 } 4543 4544 int iscsit_free_session(struct iscsi_session *sess) 4545 { 4546 u16 conn_count = atomic_read(&sess->nconn); 4547 struct iscsi_conn *conn, *conn_tmp = NULL; 4548 int is_last; 4549 4550 spin_lock_bh(&sess->conn_lock); 4551 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4552 4553 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4554 conn_list) { 4555 if (conn_count == 0) 4556 break; 4557 4558 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4559 is_last = 1; 4560 } else { 4561 iscsit_inc_conn_usage_count(conn_tmp); 4562 is_last = 0; 4563 } 4564 iscsit_inc_conn_usage_count(conn); 4565 4566 spin_unlock_bh(&sess->conn_lock); 4567 iscsit_cause_connection_reinstatement(conn, 1); 4568 spin_lock_bh(&sess->conn_lock); 4569 4570 iscsit_dec_conn_usage_count(conn); 4571 if (is_last == 0) 4572 iscsit_dec_conn_usage_count(conn_tmp); 4573 4574 conn_count--; 4575 } 4576 4577 if (atomic_read(&sess->nconn)) { 4578 spin_unlock_bh(&sess->conn_lock); 4579 wait_for_completion(&sess->session_wait_comp); 4580 } else 4581 spin_unlock_bh(&sess->conn_lock); 4582 4583 iscsit_close_session(sess); 4584 return 0; 4585 } 4586 4587 void iscsit_stop_session( 4588 struct iscsi_session *sess, 4589 int session_sleep, 4590 int connection_sleep) 4591 { 4592 u16 conn_count = atomic_read(&sess->nconn); 4593 struct iscsi_conn *conn, *conn_tmp = NULL; 4594 int is_last; 4595 4596 spin_lock_bh(&sess->conn_lock); 4597 if (session_sleep) 4598 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4599 4600 if (connection_sleep) { 4601 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4602 conn_list) { 4603 if (conn_count == 0) 4604 break; 4605 4606 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4607 is_last = 1; 4608 } else { 4609 iscsit_inc_conn_usage_count(conn_tmp); 4610 is_last = 0; 4611 } 4612 iscsit_inc_conn_usage_count(conn); 4613 4614 spin_unlock_bh(&sess->conn_lock); 4615 iscsit_cause_connection_reinstatement(conn, 1); 4616 spin_lock_bh(&sess->conn_lock); 4617 4618 iscsit_dec_conn_usage_count(conn); 4619 if (is_last == 0) 4620 iscsit_dec_conn_usage_count(conn_tmp); 4621 conn_count--; 4622 } 4623 } else { 4624 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4625 iscsit_cause_connection_reinstatement(conn, 0); 4626 } 4627 4628 if (session_sleep && atomic_read(&sess->nconn)) { 4629 spin_unlock_bh(&sess->conn_lock); 4630 wait_for_completion(&sess->session_wait_comp); 4631 } else 4632 spin_unlock_bh(&sess->conn_lock); 4633 } 4634 4635 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4636 { 4637 struct iscsi_session *sess; 4638 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4639 struct se_session *se_sess, *se_sess_tmp; 4640 LIST_HEAD(free_list); 4641 int session_count = 0; 4642 4643 spin_lock_bh(&se_tpg->session_lock); 4644 if (tpg->nsessions && !force) { 4645 spin_unlock_bh(&se_tpg->session_lock); 4646 return -1; 4647 } 4648 4649 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4650 sess_list) { 4651 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4652 4653 spin_lock(&sess->conn_lock); 4654 if (atomic_read(&sess->session_fall_back_to_erl0) || 4655 atomic_read(&sess->session_logout) || 4656 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4657 spin_unlock(&sess->conn_lock); 4658 continue; 4659 } 4660 atomic_set(&sess->session_reinstatement, 1); 4661 atomic_set(&sess->session_fall_back_to_erl0, 1); 4662 spin_unlock(&sess->conn_lock); 4663 4664 list_move_tail(&se_sess->sess_list, &free_list); 4665 } 4666 spin_unlock_bh(&se_tpg->session_lock); 4667 4668 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4669 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4670 4671 iscsit_free_session(sess); 4672 session_count++; 4673 } 4674 4675 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4676 " Group: %hu\n", session_count, tpg->tpgt); 4677 return 0; 4678 } 4679 4680 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4681 MODULE_VERSION("4.1.x"); 4682 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4683 MODULE_LICENSE("GPL"); 4684 4685 module_init(iscsi_target_init_module); 4686 module_exit(iscsi_target_cleanup_module); 4687