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 sg_set_buf(sg + 1, pad_bytes, padding); 1420 1421 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1422 1423 crypto_ahash_digest(hash); 1424 } 1425 1426 int 1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1428 struct iscsi_cmd *cmd, u32 payload_length, 1429 bool *success) 1430 { 1431 struct iscsi_data *hdr = buf; 1432 struct se_cmd *se_cmd; 1433 int rc; 1434 1435 /* iSCSI write */ 1436 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1437 1438 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1439 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1440 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1441 payload_length, conn->cid); 1442 1443 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1444 pr_err("Command ITT: 0x%08x received DataOUT after" 1445 " last DataOUT received, dumping payload\n", 1446 cmd->init_task_tag); 1447 return iscsit_dump_data_payload(conn, payload_length, 1); 1448 } 1449 1450 if (cmd->data_direction != DMA_TO_DEVICE) { 1451 pr_err("Command ITT: 0x%08x received DataOUT for a" 1452 " NON-WRITE command.\n", cmd->init_task_tag); 1453 return iscsit_dump_data_payload(conn, payload_length, 1); 1454 } 1455 se_cmd = &cmd->se_cmd; 1456 iscsit_mod_dataout_timer(cmd); 1457 1458 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1459 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1460 be32_to_cpu(hdr->offset), payload_length, 1461 cmd->se_cmd.data_length); 1462 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1463 } 1464 1465 if (cmd->unsolicited_data) { 1466 int dump_unsolicited_data = 0; 1467 1468 if (conn->sess->sess_ops->InitialR2T) { 1469 pr_err("Received unexpected unsolicited data" 1470 " while InitialR2T=Yes, protocol error.\n"); 1471 transport_send_check_condition_and_sense(&cmd->se_cmd, 1472 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1473 return -1; 1474 } 1475 /* 1476 * Special case for dealing with Unsolicited DataOUT 1477 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1478 * failures; 1479 */ 1480 1481 /* Something's amiss if we're not in WRITE_PENDING state... */ 1482 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1483 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1484 dump_unsolicited_data = 1; 1485 1486 if (dump_unsolicited_data) { 1487 /* 1488 * Check if a delayed TASK_ABORTED status needs to 1489 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1490 * received with the unsolicited data out. 1491 */ 1492 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1493 iscsit_stop_dataout_timer(cmd); 1494 1495 transport_check_aborted_status(se_cmd, 1496 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1497 return iscsit_dump_data_payload(conn, payload_length, 1); 1498 } 1499 } else { 1500 /* 1501 * For the normal solicited data path: 1502 * 1503 * Check for a delayed TASK_ABORTED status and dump any 1504 * incoming data out payload if one exists. Also, when the 1505 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1506 * data out sequence, we decrement outstanding_r2ts. Once 1507 * outstanding_r2ts reaches zero, go ahead and send the delayed 1508 * TASK_ABORTED status. 1509 */ 1510 if (se_cmd->transport_state & CMD_T_ABORTED) { 1511 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1512 if (--cmd->outstanding_r2ts < 1) { 1513 iscsit_stop_dataout_timer(cmd); 1514 transport_check_aborted_status( 1515 se_cmd, 1); 1516 } 1517 1518 return iscsit_dump_data_payload(conn, payload_length, 1); 1519 } 1520 } 1521 /* 1522 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1523 * within-command recovery checks before receiving the payload. 1524 */ 1525 rc = iscsit_check_pre_dataout(cmd, buf); 1526 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1527 return 0; 1528 else if (rc == DATAOUT_CANNOT_RECOVER) 1529 return -1; 1530 *success = true; 1531 return 0; 1532 } 1533 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1534 1535 int 1536 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1537 struct iscsi_cmd **out_cmd) 1538 { 1539 struct iscsi_data *hdr = buf; 1540 struct iscsi_cmd *cmd; 1541 u32 payload_length = ntoh24(hdr->dlength); 1542 int rc; 1543 bool success = false; 1544 1545 if (!payload_length) { 1546 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1547 return 0; 1548 } 1549 1550 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1551 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1552 " MaxXmitDataSegmentLength: %u\n", payload_length, 1553 conn->conn_ops->MaxXmitDataSegmentLength); 1554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1555 } 1556 1557 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1558 if (!cmd) 1559 return 0; 1560 1561 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1562 1563 if (success) 1564 *out_cmd = cmd; 1565 1566 return rc; 1567 } 1568 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1569 1570 static int 1571 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1572 struct iscsi_data *hdr) 1573 { 1574 struct kvec *iov; 1575 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1576 u32 payload_length = ntoh24(hdr->dlength); 1577 int iov_ret, data_crc_failed = 0; 1578 1579 rx_size += payload_length; 1580 iov = &cmd->iov_data[0]; 1581 1582 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1583 payload_length); 1584 if (iov_ret < 0) 1585 return -1; 1586 1587 iov_count += iov_ret; 1588 1589 padding = ((-payload_length) & 3); 1590 if (padding != 0) { 1591 iov[iov_count].iov_base = cmd->pad_bytes; 1592 iov[iov_count++].iov_len = padding; 1593 rx_size += padding; 1594 pr_debug("Receiving %u padding bytes.\n", padding); 1595 } 1596 1597 if (conn->conn_ops->DataDigest) { 1598 iov[iov_count].iov_base = &checksum; 1599 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1600 rx_size += ISCSI_CRC_LEN; 1601 } 1602 1603 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1604 1605 iscsit_unmap_iovec(cmd); 1606 1607 if (rx_got != rx_size) 1608 return -1; 1609 1610 if (conn->conn_ops->DataDigest) { 1611 u32 data_crc; 1612 1613 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1614 be32_to_cpu(hdr->offset), 1615 payload_length, padding, 1616 cmd->pad_bytes); 1617 1618 if (checksum != data_crc) { 1619 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1620 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1621 " does not match computed 0x%08x\n", 1622 hdr->itt, hdr->offset, payload_length, 1623 hdr->datasn, checksum, data_crc); 1624 data_crc_failed = 1; 1625 } else { 1626 pr_debug("Got CRC32C DataDigest 0x%08x for" 1627 " %u bytes of Data Out\n", checksum, 1628 payload_length); 1629 } 1630 } 1631 1632 return data_crc_failed; 1633 } 1634 1635 int 1636 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1637 bool data_crc_failed) 1638 { 1639 struct iscsi_conn *conn = cmd->conn; 1640 int rc, ooo_cmdsn; 1641 /* 1642 * Increment post receive data and CRC values or perform 1643 * within-command recovery. 1644 */ 1645 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1646 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1647 return 0; 1648 else if (rc == DATAOUT_SEND_R2T) { 1649 iscsit_set_dataout_sequence_values(cmd); 1650 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1651 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1652 /* 1653 * Handle extra special case for out of order 1654 * Unsolicited Data Out. 1655 */ 1656 spin_lock_bh(&cmd->istate_lock); 1657 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1658 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1659 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1660 spin_unlock_bh(&cmd->istate_lock); 1661 1662 iscsit_stop_dataout_timer(cmd); 1663 if (ooo_cmdsn) 1664 return 0; 1665 target_execute_cmd(&cmd->se_cmd); 1666 return 0; 1667 } else /* DATAOUT_CANNOT_RECOVER */ 1668 return -1; 1669 1670 return 0; 1671 } 1672 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1673 1674 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1675 { 1676 struct iscsi_cmd *cmd = NULL; 1677 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1678 int rc; 1679 bool data_crc_failed = false; 1680 1681 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1682 if (rc < 0) 1683 return 0; 1684 else if (!cmd) 1685 return 0; 1686 1687 rc = iscsit_get_dataout(conn, cmd, hdr); 1688 if (rc < 0) 1689 return rc; 1690 else if (rc > 0) 1691 data_crc_failed = true; 1692 1693 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1694 } 1695 1696 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1697 struct iscsi_nopout *hdr) 1698 { 1699 u32 payload_length = ntoh24(hdr->dlength); 1700 1701 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1702 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1703 if (!cmd) 1704 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1705 (unsigned char *)hdr); 1706 1707 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1708 (unsigned char *)hdr); 1709 } 1710 1711 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1712 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1713 " not set, protocol error.\n"); 1714 if (!cmd) 1715 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1716 (unsigned char *)hdr); 1717 1718 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1719 (unsigned char *)hdr); 1720 } 1721 1722 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1723 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1724 " greater than MaxXmitDataSegmentLength: %u, protocol" 1725 " error.\n", payload_length, 1726 conn->conn_ops->MaxXmitDataSegmentLength); 1727 if (!cmd) 1728 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1729 (unsigned char *)hdr); 1730 1731 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1732 (unsigned char *)hdr); 1733 } 1734 1735 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1736 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1737 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1738 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1739 payload_length); 1740 /* 1741 * This is not a response to a Unsolicited NopIN, which means 1742 * it can either be a NOPOUT ping request (with a valid ITT), 1743 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1744 * Either way, make sure we allocate an struct iscsi_cmd, as both 1745 * can contain ping data. 1746 */ 1747 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1748 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1749 cmd->i_state = ISTATE_SEND_NOPIN; 1750 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1751 1 : 0); 1752 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1753 cmd->targ_xfer_tag = 0xFFFFFFFF; 1754 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1755 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1756 cmd->data_direction = DMA_NONE; 1757 } 1758 1759 return 0; 1760 } 1761 EXPORT_SYMBOL(iscsit_setup_nop_out); 1762 1763 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1764 struct iscsi_nopout *hdr) 1765 { 1766 struct iscsi_cmd *cmd_p = NULL; 1767 int cmdsn_ret = 0; 1768 /* 1769 * Initiator is expecting a NopIN ping reply.. 1770 */ 1771 if (hdr->itt != RESERVED_ITT) { 1772 if (!cmd) 1773 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1774 (unsigned char *)hdr); 1775 1776 spin_lock_bh(&conn->cmd_lock); 1777 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1778 spin_unlock_bh(&conn->cmd_lock); 1779 1780 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1781 1782 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1783 iscsit_add_cmd_to_response_queue(cmd, conn, 1784 cmd->i_state); 1785 return 0; 1786 } 1787 1788 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1789 (unsigned char *)hdr, hdr->cmdsn); 1790 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1791 return 0; 1792 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1793 return -1; 1794 1795 return 0; 1796 } 1797 /* 1798 * This was a response to a unsolicited NOPIN ping. 1799 */ 1800 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1801 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1802 if (!cmd_p) 1803 return -EINVAL; 1804 1805 iscsit_stop_nopin_response_timer(conn); 1806 1807 cmd_p->i_state = ISTATE_REMOVE; 1808 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1809 1810 iscsit_start_nopin_timer(conn); 1811 return 0; 1812 } 1813 /* 1814 * Otherwise, initiator is not expecting a NOPIN is response. 1815 * Just ignore for now. 1816 */ 1817 1818 if (cmd) 1819 iscsit_free_cmd(cmd, false); 1820 1821 return 0; 1822 } 1823 EXPORT_SYMBOL(iscsit_process_nop_out); 1824 1825 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1826 unsigned char *buf) 1827 { 1828 unsigned char *ping_data = NULL; 1829 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1830 struct kvec *iov = NULL; 1831 u32 payload_length = ntoh24(hdr->dlength); 1832 int ret; 1833 1834 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1835 if (ret < 0) 1836 return 0; 1837 /* 1838 * Handle NOP-OUT payload for traditional iSCSI sockets 1839 */ 1840 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1841 u32 checksum, data_crc, padding = 0; 1842 int niov = 0, rx_got, rx_size = payload_length; 1843 1844 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1845 if (!ping_data) { 1846 ret = -1; 1847 goto out; 1848 } 1849 1850 iov = &cmd->iov_misc[0]; 1851 iov[niov].iov_base = ping_data; 1852 iov[niov++].iov_len = payload_length; 1853 1854 padding = ((-payload_length) & 3); 1855 if (padding != 0) { 1856 pr_debug("Receiving %u additional bytes" 1857 " for padding.\n", padding); 1858 iov[niov].iov_base = &cmd->pad_bytes; 1859 iov[niov++].iov_len = padding; 1860 rx_size += padding; 1861 } 1862 if (conn->conn_ops->DataDigest) { 1863 iov[niov].iov_base = &checksum; 1864 iov[niov++].iov_len = ISCSI_CRC_LEN; 1865 rx_size += ISCSI_CRC_LEN; 1866 } 1867 1868 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1869 if (rx_got != rx_size) { 1870 ret = -1; 1871 goto out; 1872 } 1873 1874 if (conn->conn_ops->DataDigest) { 1875 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1876 payload_length, padding, 1877 cmd->pad_bytes, &data_crc); 1878 1879 if (checksum != data_crc) { 1880 pr_err("Ping data CRC32C DataDigest" 1881 " 0x%08x does not match computed 0x%08x\n", 1882 checksum, data_crc); 1883 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1884 pr_err("Unable to recover from" 1885 " NOPOUT Ping DataCRC failure while in" 1886 " ERL=0.\n"); 1887 ret = -1; 1888 goto out; 1889 } else { 1890 /* 1891 * Silently drop this PDU and let the 1892 * initiator plug the CmdSN gap. 1893 */ 1894 pr_debug("Dropping NOPOUT" 1895 " Command CmdSN: 0x%08x due to" 1896 " DataCRC error.\n", hdr->cmdsn); 1897 ret = 0; 1898 goto out; 1899 } 1900 } else { 1901 pr_debug("Got CRC32C DataDigest" 1902 " 0x%08x for %u bytes of ping data.\n", 1903 checksum, payload_length); 1904 } 1905 } 1906 1907 ping_data[payload_length] = '\0'; 1908 /* 1909 * Attach ping data to struct iscsi_cmd->buf_ptr. 1910 */ 1911 cmd->buf_ptr = ping_data; 1912 cmd->buf_ptr_size = payload_length; 1913 1914 pr_debug("Got %u bytes of NOPOUT ping" 1915 " data.\n", payload_length); 1916 pr_debug("Ping Data: \"%s\"\n", ping_data); 1917 } 1918 1919 return iscsit_process_nop_out(conn, cmd, hdr); 1920 out: 1921 if (cmd) 1922 iscsit_free_cmd(cmd, false); 1923 1924 kfree(ping_data); 1925 return ret; 1926 } 1927 1928 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1929 { 1930 switch (iscsi_tmf) { 1931 case ISCSI_TM_FUNC_ABORT_TASK: 1932 return TMR_ABORT_TASK; 1933 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1934 return TMR_ABORT_TASK_SET; 1935 case ISCSI_TM_FUNC_CLEAR_ACA: 1936 return TMR_CLEAR_ACA; 1937 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1938 return TMR_CLEAR_TASK_SET; 1939 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1940 return TMR_LUN_RESET; 1941 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1942 return TMR_TARGET_WARM_RESET; 1943 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1944 return TMR_TARGET_COLD_RESET; 1945 default: 1946 return TMR_UNKNOWN; 1947 } 1948 } 1949 1950 int 1951 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1952 unsigned char *buf) 1953 { 1954 struct se_tmr_req *se_tmr; 1955 struct iscsi_tmr_req *tmr_req; 1956 struct iscsi_tm *hdr; 1957 int out_of_order_cmdsn = 0, ret; 1958 u8 function, tcm_function = TMR_UNKNOWN; 1959 1960 hdr = (struct iscsi_tm *) buf; 1961 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1962 function = hdr->flags; 1963 1964 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1965 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1966 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1967 hdr->rtt, hdr->refcmdsn, conn->cid); 1968 1969 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1970 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1971 hdr->rtt != RESERVED_ITT)) { 1972 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1973 hdr->rtt = RESERVED_ITT; 1974 } 1975 1976 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1977 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1978 pr_err("Task Management Request TASK_REASSIGN not" 1979 " issued as immediate command, bad iSCSI Initiator" 1980 "implementation\n"); 1981 return iscsit_add_reject_cmd(cmd, 1982 ISCSI_REASON_PROTOCOL_ERROR, buf); 1983 } 1984 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1985 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1986 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1987 1988 cmd->data_direction = DMA_NONE; 1989 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1990 if (!cmd->tmr_req) { 1991 return iscsit_add_reject_cmd(cmd, 1992 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1993 buf); 1994 } 1995 1996 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1997 conn->sess->se_sess, 0, DMA_NONE, 1998 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 1999 2000 target_get_sess_cmd(&cmd->se_cmd, true); 2001 2002 /* 2003 * TASK_REASSIGN for ERL=2 / connection stays inside of 2004 * LIO-Target $FABRIC_MOD 2005 */ 2006 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2007 tcm_function = iscsit_convert_tmf(function); 2008 if (tcm_function == TMR_UNKNOWN) { 2009 pr_err("Unknown iSCSI TMR Function:" 2010 " 0x%02x\n", function); 2011 return iscsit_add_reject_cmd(cmd, 2012 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2013 } 2014 } 2015 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2016 GFP_KERNEL); 2017 if (ret < 0) 2018 return iscsit_add_reject_cmd(cmd, 2019 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2020 2021 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2022 2023 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2024 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2025 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2026 cmd->init_task_tag = hdr->itt; 2027 cmd->targ_xfer_tag = 0xFFFFFFFF; 2028 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2029 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2030 se_tmr = cmd->se_cmd.se_tmr_req; 2031 tmr_req = cmd->tmr_req; 2032 /* 2033 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2034 */ 2035 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2036 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2037 scsilun_to_int(&hdr->lun)); 2038 if (ret < 0) { 2039 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2040 goto attach; 2041 } 2042 } 2043 2044 switch (function) { 2045 case ISCSI_TM_FUNC_ABORT_TASK: 2046 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2047 if (se_tmr->response) 2048 goto attach; 2049 break; 2050 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2051 case ISCSI_TM_FUNC_CLEAR_ACA: 2052 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2053 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2054 break; 2055 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2056 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2057 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2058 goto attach; 2059 } 2060 break; 2061 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2062 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2063 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2064 goto attach; 2065 } 2066 break; 2067 case ISCSI_TM_FUNC_TASK_REASSIGN: 2068 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2069 /* 2070 * Perform sanity checks on the ExpDataSN only if the 2071 * TASK_REASSIGN was successful. 2072 */ 2073 if (se_tmr->response) 2074 break; 2075 2076 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2077 return iscsit_add_reject_cmd(cmd, 2078 ISCSI_REASON_BOOKMARK_INVALID, buf); 2079 break; 2080 default: 2081 pr_err("Unknown TMR function: 0x%02x, protocol" 2082 " error.\n", function); 2083 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2084 goto attach; 2085 } 2086 2087 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2088 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2089 se_tmr->call_transport = 1; 2090 attach: 2091 spin_lock_bh(&conn->cmd_lock); 2092 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2093 spin_unlock_bh(&conn->cmd_lock); 2094 2095 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2096 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2097 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2098 out_of_order_cmdsn = 1; 2099 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2100 target_put_sess_cmd(&cmd->se_cmd); 2101 return 0; 2102 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2103 return -1; 2104 } 2105 } 2106 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2107 2108 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2109 return 0; 2110 /* 2111 * Found the referenced task, send to transport for processing. 2112 */ 2113 if (se_tmr->call_transport) 2114 return transport_generic_handle_tmr(&cmd->se_cmd); 2115 2116 /* 2117 * Could not find the referenced LUN, task, or Task Management 2118 * command not authorized or supported. Change state and 2119 * let the tx_thread send the response. 2120 * 2121 * For connection recovery, this is also the default action for 2122 * TMR TASK_REASSIGN. 2123 */ 2124 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2125 target_put_sess_cmd(&cmd->se_cmd); 2126 return 0; 2127 } 2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2129 2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2131 int 2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2133 struct iscsi_text *hdr) 2134 { 2135 u32 payload_length = ntoh24(hdr->dlength); 2136 2137 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2138 pr_err("Unable to accept text parameter length: %u" 2139 "greater than MaxXmitDataSegmentLength %u.\n", 2140 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2141 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2142 (unsigned char *)hdr); 2143 } 2144 2145 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2146 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2147 pr_err("Multi sequence text commands currently not supported\n"); 2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2149 (unsigned char *)hdr); 2150 } 2151 2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2154 hdr->exp_statsn, payload_length); 2155 2156 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2157 cmd->i_state = ISTATE_SEND_TEXTRSP; 2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2160 cmd->targ_xfer_tag = 0xFFFFFFFF; 2161 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2162 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2163 cmd->data_direction = DMA_NONE; 2164 kfree(cmd->text_in_ptr); 2165 cmd->text_in_ptr = NULL; 2166 2167 return 0; 2168 } 2169 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2170 2171 int 2172 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2173 struct iscsi_text *hdr) 2174 { 2175 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2176 int cmdsn_ret; 2177 2178 if (!text_in) { 2179 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2180 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2181 pr_err("Unable to locate text_in buffer for sendtargets" 2182 " discovery\n"); 2183 goto reject; 2184 } 2185 goto empty_sendtargets; 2186 } 2187 if (strncmp("SendTargets", text_in, 11) != 0) { 2188 pr_err("Received Text Data that is not" 2189 " SendTargets, cannot continue.\n"); 2190 goto reject; 2191 } 2192 text_ptr = strchr(text_in, '='); 2193 if (!text_ptr) { 2194 pr_err("No \"=\" separator found in Text Data," 2195 " cannot continue.\n"); 2196 goto reject; 2197 } 2198 if (!strncmp("=All", text_ptr, 4)) { 2199 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2200 } else if (!strncmp("=iqn.", text_ptr, 5) || 2201 !strncmp("=eui.", text_ptr, 5)) { 2202 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2203 } else { 2204 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2205 goto reject; 2206 } 2207 2208 spin_lock_bh(&conn->cmd_lock); 2209 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2210 spin_unlock_bh(&conn->cmd_lock); 2211 2212 empty_sendtargets: 2213 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2214 2215 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2216 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2217 (unsigned char *)hdr, hdr->cmdsn); 2218 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2219 return -1; 2220 2221 return 0; 2222 } 2223 2224 return iscsit_execute_cmd(cmd, 0); 2225 2226 reject: 2227 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2228 (unsigned char *)hdr); 2229 } 2230 EXPORT_SYMBOL(iscsit_process_text_cmd); 2231 2232 static int 2233 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2234 unsigned char *buf) 2235 { 2236 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2237 char *text_in = NULL; 2238 u32 payload_length = ntoh24(hdr->dlength); 2239 int rx_size, rc; 2240 2241 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2242 if (rc < 0) 2243 return 0; 2244 2245 rx_size = payload_length; 2246 if (payload_length) { 2247 u32 checksum = 0, data_crc = 0; 2248 u32 padding = 0, pad_bytes = 0; 2249 int niov = 0, rx_got; 2250 struct kvec iov[3]; 2251 2252 text_in = kzalloc(payload_length, GFP_KERNEL); 2253 if (!text_in) 2254 goto reject; 2255 2256 cmd->text_in_ptr = text_in; 2257 2258 memset(iov, 0, 3 * sizeof(struct kvec)); 2259 iov[niov].iov_base = text_in; 2260 iov[niov++].iov_len = payload_length; 2261 2262 padding = ((-payload_length) & 3); 2263 if (padding != 0) { 2264 iov[niov].iov_base = &pad_bytes; 2265 iov[niov++].iov_len = padding; 2266 rx_size += padding; 2267 pr_debug("Receiving %u additional bytes" 2268 " for padding.\n", padding); 2269 } 2270 if (conn->conn_ops->DataDigest) { 2271 iov[niov].iov_base = &checksum; 2272 iov[niov++].iov_len = ISCSI_CRC_LEN; 2273 rx_size += ISCSI_CRC_LEN; 2274 } 2275 2276 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2277 if (rx_got != rx_size) 2278 goto reject; 2279 2280 if (conn->conn_ops->DataDigest) { 2281 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in, 2282 payload_length, padding, 2283 &pad_bytes, &data_crc); 2284 2285 if (checksum != data_crc) { 2286 pr_err("Text data CRC32C DataDigest" 2287 " 0x%08x does not match computed" 2288 " 0x%08x\n", checksum, data_crc); 2289 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2290 pr_err("Unable to recover from" 2291 " Text Data digest failure while in" 2292 " ERL=0.\n"); 2293 goto reject; 2294 } else { 2295 /* 2296 * Silently drop this PDU and let the 2297 * initiator plug the CmdSN gap. 2298 */ 2299 pr_debug("Dropping Text" 2300 " Command CmdSN: 0x%08x due to" 2301 " DataCRC error.\n", hdr->cmdsn); 2302 kfree(text_in); 2303 return 0; 2304 } 2305 } else { 2306 pr_debug("Got CRC32C DataDigest" 2307 " 0x%08x for %u bytes of text data.\n", 2308 checksum, payload_length); 2309 } 2310 } 2311 text_in[payload_length - 1] = '\0'; 2312 pr_debug("Successfully read %d bytes of text" 2313 " data.\n", payload_length); 2314 } 2315 2316 return iscsit_process_text_cmd(conn, cmd, hdr); 2317 2318 reject: 2319 kfree(cmd->text_in_ptr); 2320 cmd->text_in_ptr = NULL; 2321 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2322 } 2323 2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2325 { 2326 struct iscsi_conn *conn_p; 2327 struct iscsi_session *sess = conn->sess; 2328 2329 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2330 " for SID: %u.\n", conn->cid, conn->sess->sid); 2331 2332 atomic_set(&sess->session_logout, 1); 2333 atomic_set(&conn->conn_logout_remove, 1); 2334 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2335 2336 iscsit_inc_conn_usage_count(conn); 2337 iscsit_inc_session_usage_count(sess); 2338 2339 spin_lock_bh(&sess->conn_lock); 2340 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2341 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2342 continue; 2343 2344 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2345 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2346 } 2347 spin_unlock_bh(&sess->conn_lock); 2348 2349 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2350 2351 return 0; 2352 } 2353 2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2355 { 2356 struct iscsi_conn *l_conn; 2357 struct iscsi_session *sess = conn->sess; 2358 2359 pr_debug("Received logout request CLOSECONNECTION for CID:" 2360 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2361 2362 /* 2363 * A Logout Request with a CLOSECONNECTION reason code for a CID 2364 * can arrive on a connection with a differing CID. 2365 */ 2366 if (conn->cid == cmd->logout_cid) { 2367 spin_lock_bh(&conn->state_lock); 2368 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2369 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2370 2371 atomic_set(&conn->conn_logout_remove, 1); 2372 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2373 iscsit_inc_conn_usage_count(conn); 2374 2375 spin_unlock_bh(&conn->state_lock); 2376 } else { 2377 /* 2378 * Handle all different cid CLOSECONNECTION requests in 2379 * iscsit_logout_post_handler_diffcid() as to give enough 2380 * time for any non immediate command's CmdSN to be 2381 * acknowledged on the connection in question. 2382 * 2383 * Here we simply make sure the CID is still around. 2384 */ 2385 l_conn = iscsit_get_conn_from_cid(sess, 2386 cmd->logout_cid); 2387 if (!l_conn) { 2388 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2389 iscsit_add_cmd_to_response_queue(cmd, conn, 2390 cmd->i_state); 2391 return 0; 2392 } 2393 2394 iscsit_dec_conn_usage_count(l_conn); 2395 } 2396 2397 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2398 2399 return 0; 2400 } 2401 2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2403 { 2404 struct iscsi_session *sess = conn->sess; 2405 2406 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2407 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2408 2409 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2410 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2411 " while ERL!=2.\n"); 2412 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2413 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2414 return 0; 2415 } 2416 2417 if (conn->cid == cmd->logout_cid) { 2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2419 " with CID: %hu on CID: %hu, implementation error.\n", 2420 cmd->logout_cid, conn->cid); 2421 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2422 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2423 return 0; 2424 } 2425 2426 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2427 2428 return 0; 2429 } 2430 2431 int 2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2433 unsigned char *buf) 2434 { 2435 int cmdsn_ret, logout_remove = 0; 2436 u8 reason_code = 0; 2437 struct iscsi_logout *hdr; 2438 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2439 2440 hdr = (struct iscsi_logout *) buf; 2441 reason_code = (hdr->flags & 0x7f); 2442 2443 if (tiqn) { 2444 spin_lock(&tiqn->logout_stats.lock); 2445 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2446 tiqn->logout_stats.normal_logouts++; 2447 else 2448 tiqn->logout_stats.abnormal_logouts++; 2449 spin_unlock(&tiqn->logout_stats.lock); 2450 } 2451 2452 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2453 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2454 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2455 hdr->cid, conn->cid); 2456 2457 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2458 pr_err("Received logout request on connection that" 2459 " is not in logged in state, ignoring request.\n"); 2460 iscsit_free_cmd(cmd, false); 2461 return 0; 2462 } 2463 2464 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2465 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2466 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2467 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2468 cmd->targ_xfer_tag = 0xFFFFFFFF; 2469 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2470 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2471 cmd->logout_cid = be16_to_cpu(hdr->cid); 2472 cmd->logout_reason = reason_code; 2473 cmd->data_direction = DMA_NONE; 2474 2475 /* 2476 * We need to sleep in these cases (by returning 1) until the Logout 2477 * Response gets sent in the tx thread. 2478 */ 2479 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2480 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2481 be16_to_cpu(hdr->cid) == conn->cid)) 2482 logout_remove = 1; 2483 2484 spin_lock_bh(&conn->cmd_lock); 2485 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2486 spin_unlock_bh(&conn->cmd_lock); 2487 2488 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2489 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2490 2491 /* 2492 * Immediate commands are executed, well, immediately. 2493 * Non-Immediate Logout Commands are executed in CmdSN order. 2494 */ 2495 if (cmd->immediate_cmd) { 2496 int ret = iscsit_execute_cmd(cmd, 0); 2497 2498 if (ret < 0) 2499 return ret; 2500 } else { 2501 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2502 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2503 logout_remove = 0; 2504 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2505 return -1; 2506 } 2507 2508 return logout_remove; 2509 } 2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2511 2512 int iscsit_handle_snack( 2513 struct iscsi_conn *conn, 2514 unsigned char *buf) 2515 { 2516 struct iscsi_snack *hdr; 2517 2518 hdr = (struct iscsi_snack *) buf; 2519 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2520 2521 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2522 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2523 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2524 hdr->begrun, hdr->runlength, conn->cid); 2525 2526 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2527 pr_err("Initiator sent SNACK request while in" 2528 " ErrorRecoveryLevel=0.\n"); 2529 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2530 buf); 2531 } 2532 /* 2533 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2534 * call from inside iscsi_send_recovery_datain_or_r2t(). 2535 */ 2536 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2537 case 0: 2538 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2539 hdr->itt, 2540 be32_to_cpu(hdr->ttt), 2541 be32_to_cpu(hdr->begrun), 2542 be32_to_cpu(hdr->runlength)); 2543 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2544 return iscsit_handle_status_snack(conn, hdr->itt, 2545 be32_to_cpu(hdr->ttt), 2546 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2547 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2548 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2549 be32_to_cpu(hdr->begrun), 2550 be32_to_cpu(hdr->runlength)); 2551 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2552 /* FIXME: Support R-Data SNACK */ 2553 pr_err("R-Data SNACK Not Supported.\n"); 2554 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2555 buf); 2556 default: 2557 pr_err("Unknown SNACK type 0x%02x, protocol" 2558 " error.\n", hdr->flags & 0x0f); 2559 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2560 buf); 2561 } 2562 2563 return 0; 2564 } 2565 EXPORT_SYMBOL(iscsit_handle_snack); 2566 2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2568 { 2569 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2570 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2571 wait_for_completion_interruptible_timeout( 2572 &conn->rx_half_close_comp, 2573 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2574 } 2575 } 2576 2577 static int iscsit_handle_immediate_data( 2578 struct iscsi_cmd *cmd, 2579 struct iscsi_scsi_req *hdr, 2580 u32 length) 2581 { 2582 int iov_ret, rx_got = 0, rx_size = 0; 2583 u32 checksum, iov_count = 0, padding = 0; 2584 struct iscsi_conn *conn = cmd->conn; 2585 struct kvec *iov; 2586 2587 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2588 if (iov_ret < 0) 2589 return IMMEDIATE_DATA_CANNOT_RECOVER; 2590 2591 rx_size = length; 2592 iov_count = iov_ret; 2593 iov = &cmd->iov_data[0]; 2594 2595 padding = ((-length) & 3); 2596 if (padding != 0) { 2597 iov[iov_count].iov_base = cmd->pad_bytes; 2598 iov[iov_count++].iov_len = padding; 2599 rx_size += padding; 2600 } 2601 2602 if (conn->conn_ops->DataDigest) { 2603 iov[iov_count].iov_base = &checksum; 2604 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2605 rx_size += ISCSI_CRC_LEN; 2606 } 2607 2608 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2609 2610 iscsit_unmap_iovec(cmd); 2611 2612 if (rx_got != rx_size) { 2613 iscsit_rx_thread_wait_for_tcp(conn); 2614 return IMMEDIATE_DATA_CANNOT_RECOVER; 2615 } 2616 2617 if (conn->conn_ops->DataDigest) { 2618 u32 data_crc; 2619 2620 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2621 cmd->write_data_done, length, padding, 2622 cmd->pad_bytes); 2623 2624 if (checksum != data_crc) { 2625 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2626 " does not match computed 0x%08x\n", checksum, 2627 data_crc); 2628 2629 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2630 pr_err("Unable to recover from" 2631 " Immediate Data digest failure while" 2632 " in ERL=0.\n"); 2633 iscsit_reject_cmd(cmd, 2634 ISCSI_REASON_DATA_DIGEST_ERROR, 2635 (unsigned char *)hdr); 2636 return IMMEDIATE_DATA_CANNOT_RECOVER; 2637 } else { 2638 iscsit_reject_cmd(cmd, 2639 ISCSI_REASON_DATA_DIGEST_ERROR, 2640 (unsigned char *)hdr); 2641 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2642 } 2643 } else { 2644 pr_debug("Got CRC32C DataDigest 0x%08x for" 2645 " %u bytes of Immediate Data\n", checksum, 2646 length); 2647 } 2648 } 2649 2650 cmd->write_data_done += length; 2651 2652 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2653 spin_lock_bh(&cmd->istate_lock); 2654 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2655 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2656 spin_unlock_bh(&cmd->istate_lock); 2657 } 2658 2659 return IMMEDIATE_DATA_NORMAL_OPERATION; 2660 } 2661 2662 /* 2663 * Called with sess->conn_lock held. 2664 */ 2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2666 with active network interface */ 2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2668 { 2669 struct iscsi_cmd *cmd; 2670 struct iscsi_conn *conn_p; 2671 bool found = false; 2672 2673 /* 2674 * Only send a Asynchronous Message on connections whos network 2675 * interface is still functional. 2676 */ 2677 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2678 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2679 iscsit_inc_conn_usage_count(conn_p); 2680 found = true; 2681 break; 2682 } 2683 } 2684 2685 if (!found) 2686 return; 2687 2688 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2689 if (!cmd) { 2690 iscsit_dec_conn_usage_count(conn_p); 2691 return; 2692 } 2693 2694 cmd->logout_cid = conn->cid; 2695 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2696 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2697 2698 spin_lock_bh(&conn_p->cmd_lock); 2699 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2700 spin_unlock_bh(&conn_p->cmd_lock); 2701 2702 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2703 iscsit_dec_conn_usage_count(conn_p); 2704 } 2705 2706 static int iscsit_send_conn_drop_async_message( 2707 struct iscsi_cmd *cmd, 2708 struct iscsi_conn *conn) 2709 { 2710 struct iscsi_async *hdr; 2711 2712 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2713 2714 hdr = (struct iscsi_async *) cmd->pdu; 2715 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2716 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2717 cmd->init_task_tag = RESERVED_ITT; 2718 cmd->targ_xfer_tag = 0xFFFFFFFF; 2719 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2720 cmd->stat_sn = conn->stat_sn++; 2721 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2722 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2723 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2724 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2725 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2726 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2727 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2728 2729 pr_debug("Sending Connection Dropped Async Message StatSN:" 2730 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2731 cmd->logout_cid, conn->cid); 2732 2733 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2734 } 2735 2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2737 { 2738 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2739 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2740 wait_for_completion_interruptible_timeout( 2741 &conn->tx_half_close_comp, 2742 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2743 } 2744 } 2745 2746 void 2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2748 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2749 bool set_statsn) 2750 { 2751 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2752 hdr->flags = datain->flags; 2753 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2754 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2755 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2756 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2757 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2758 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2759 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2760 } 2761 } 2762 hton24(hdr->dlength, datain->length); 2763 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2764 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2765 (struct scsi_lun *)&hdr->lun); 2766 else 2767 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2768 2769 hdr->itt = cmd->init_task_tag; 2770 2771 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2772 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2773 else 2774 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2775 if (set_statsn) 2776 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2777 else 2778 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2779 2780 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2781 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2782 hdr->datasn = cpu_to_be32(datain->data_sn); 2783 hdr->offset = cpu_to_be32(datain->offset); 2784 2785 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2786 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2787 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2788 ntohl(hdr->offset), datain->length, conn->cid); 2789 } 2790 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2791 2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2793 { 2794 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2795 struct iscsi_datain datain; 2796 struct iscsi_datain_req *dr; 2797 int eodr = 0, ret; 2798 bool set_statsn = false; 2799 2800 memset(&datain, 0, sizeof(struct iscsi_datain)); 2801 dr = iscsit_get_datain_values(cmd, &datain); 2802 if (!dr) { 2803 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2804 cmd->init_task_tag); 2805 return -1; 2806 } 2807 /* 2808 * Be paranoid and double check the logic for now. 2809 */ 2810 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2811 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2812 " datain.length: %u exceeds cmd->data_length: %u\n", 2813 cmd->init_task_tag, datain.offset, datain.length, 2814 cmd->se_cmd.data_length); 2815 return -1; 2816 } 2817 2818 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2819 /* 2820 * Special case for successfully execution w/ both DATAIN 2821 * and Sense Data. 2822 */ 2823 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2824 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2825 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2826 else { 2827 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2828 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2829 iscsit_increment_maxcmdsn(cmd, conn->sess); 2830 cmd->stat_sn = conn->stat_sn++; 2831 set_statsn = true; 2832 } else if (dr->dr_complete == 2833 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2834 set_statsn = true; 2835 } 2836 2837 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2838 2839 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2840 if (ret < 0) 2841 return ret; 2842 2843 if (dr->dr_complete) { 2844 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2845 2 : 1; 2846 iscsit_free_datain_req(cmd, dr); 2847 } 2848 2849 return eodr; 2850 } 2851 2852 int 2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2854 struct iscsi_logout_rsp *hdr) 2855 { 2856 struct iscsi_conn *logout_conn = NULL; 2857 struct iscsi_conn_recovery *cr = NULL; 2858 struct iscsi_session *sess = conn->sess; 2859 /* 2860 * The actual shutting down of Sessions and/or Connections 2861 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2862 * is done in scsi_logout_post_handler(). 2863 */ 2864 switch (cmd->logout_reason) { 2865 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2866 pr_debug("iSCSI session logout successful, setting" 2867 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2868 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2869 break; 2870 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2871 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2872 break; 2873 /* 2874 * For CLOSECONNECTION logout requests carrying 2875 * a matching logout CID -> local CID, the reference 2876 * for the local CID will have been incremented in 2877 * iscsi_logout_closeconnection(). 2878 * 2879 * For CLOSECONNECTION logout requests carrying 2880 * a different CID than the connection it arrived 2881 * on, the connection responding to cmd->logout_cid 2882 * is stopped in iscsit_logout_post_handler_diffcid(). 2883 */ 2884 2885 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2886 " successful.\n", cmd->logout_cid, conn->cid); 2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2888 break; 2889 case ISCSI_LOGOUT_REASON_RECOVERY: 2890 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2891 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2892 break; 2893 /* 2894 * If the connection is still active from our point of view 2895 * force connection recovery to occur. 2896 */ 2897 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2898 cmd->logout_cid); 2899 if (logout_conn) { 2900 iscsit_connection_reinstatement_rcfr(logout_conn); 2901 iscsit_dec_conn_usage_count(logout_conn); 2902 } 2903 2904 cr = iscsit_get_inactive_connection_recovery_entry( 2905 conn->sess, cmd->logout_cid); 2906 if (!cr) { 2907 pr_err("Unable to locate CID: %hu for" 2908 " REMOVECONNFORRECOVERY Logout Request.\n", 2909 cmd->logout_cid); 2910 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2911 break; 2912 } 2913 2914 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2915 2916 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2917 " for recovery for CID: %hu on CID: %hu successful.\n", 2918 cmd->logout_cid, conn->cid); 2919 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2920 break; 2921 default: 2922 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2923 cmd->logout_reason); 2924 return -1; 2925 } 2926 2927 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2928 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2929 hdr->response = cmd->logout_response; 2930 hdr->itt = cmd->init_task_tag; 2931 cmd->stat_sn = conn->stat_sn++; 2932 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2933 2934 iscsit_increment_maxcmdsn(cmd, conn->sess); 2935 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2936 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2937 2938 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2939 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2940 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2941 cmd->logout_cid, conn->cid); 2942 2943 return 0; 2944 } 2945 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2946 2947 static int 2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2949 { 2950 int rc; 2951 2952 rc = iscsit_build_logout_rsp(cmd, conn, 2953 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2954 if (rc < 0) 2955 return rc; 2956 2957 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2958 } 2959 2960 void 2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2962 struct iscsi_nopin *hdr, bool nopout_response) 2963 { 2964 hdr->opcode = ISCSI_OP_NOOP_IN; 2965 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2966 hton24(hdr->dlength, cmd->buf_ptr_size); 2967 if (nopout_response) 2968 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2969 hdr->itt = cmd->init_task_tag; 2970 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2971 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2972 conn->stat_sn; 2973 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2974 2975 if (nopout_response) 2976 iscsit_increment_maxcmdsn(cmd, conn->sess); 2977 2978 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2979 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2980 2981 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2982 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2983 "Solicited" : "Unsolicited", cmd->init_task_tag, 2984 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2985 } 2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2987 2988 /* 2989 * Unsolicited NOPIN, either requesting a response or not. 2990 */ 2991 static int iscsit_send_unsolicited_nopin( 2992 struct iscsi_cmd *cmd, 2993 struct iscsi_conn *conn, 2994 int want_response) 2995 { 2996 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2997 int ret; 2998 2999 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3000 3001 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3002 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3003 3004 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3005 if (ret < 0) 3006 return ret; 3007 3008 spin_lock_bh(&cmd->istate_lock); 3009 cmd->i_state = want_response ? 3010 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3011 spin_unlock_bh(&cmd->istate_lock); 3012 3013 return 0; 3014 } 3015 3016 static int 3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3018 { 3019 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3020 3021 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3022 3023 /* 3024 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3025 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3026 */ 3027 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3028 3029 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3030 cmd->buf_ptr, 3031 cmd->buf_ptr_size); 3032 } 3033 3034 static int iscsit_send_r2t( 3035 struct iscsi_cmd *cmd, 3036 struct iscsi_conn *conn) 3037 { 3038 struct iscsi_r2t *r2t; 3039 struct iscsi_r2t_rsp *hdr; 3040 int ret; 3041 3042 r2t = iscsit_get_r2t_from_list(cmd); 3043 if (!r2t) 3044 return -1; 3045 3046 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3047 memset(hdr, 0, ISCSI_HDR_LEN); 3048 hdr->opcode = ISCSI_OP_R2T; 3049 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3050 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3051 (struct scsi_lun *)&hdr->lun); 3052 hdr->itt = cmd->init_task_tag; 3053 if (conn->conn_transport->iscsit_get_r2t_ttt) 3054 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3055 else 3056 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3057 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3058 hdr->statsn = cpu_to_be32(conn->stat_sn); 3059 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3060 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3061 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3062 hdr->data_offset = cpu_to_be32(r2t->offset); 3063 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3064 3065 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3066 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3067 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3068 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3069 r2t->offset, r2t->xfer_len, conn->cid); 3070 3071 spin_lock_bh(&cmd->r2t_lock); 3072 r2t->sent_r2t = 1; 3073 spin_unlock_bh(&cmd->r2t_lock); 3074 3075 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3076 if (ret < 0) { 3077 return ret; 3078 } 3079 3080 spin_lock_bh(&cmd->dataout_timeout_lock); 3081 iscsit_start_dataout_timer(cmd, conn); 3082 spin_unlock_bh(&cmd->dataout_timeout_lock); 3083 3084 return 0; 3085 } 3086 3087 /* 3088 * @recovery: If called from iscsi_task_reassign_complete_write() for 3089 * connection recovery. 3090 */ 3091 int iscsit_build_r2ts_for_cmd( 3092 struct iscsi_conn *conn, 3093 struct iscsi_cmd *cmd, 3094 bool recovery) 3095 { 3096 int first_r2t = 1; 3097 u32 offset = 0, xfer_len = 0; 3098 3099 spin_lock_bh(&cmd->r2t_lock); 3100 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3101 spin_unlock_bh(&cmd->r2t_lock); 3102 return 0; 3103 } 3104 3105 if (conn->sess->sess_ops->DataSequenceInOrder && 3106 !recovery) 3107 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3108 3109 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3110 if (conn->sess->sess_ops->DataSequenceInOrder) { 3111 offset = cmd->r2t_offset; 3112 3113 if (first_r2t && recovery) { 3114 int new_data_end = offset + 3115 conn->sess->sess_ops->MaxBurstLength - 3116 cmd->next_burst_len; 3117 3118 if (new_data_end > cmd->se_cmd.data_length) 3119 xfer_len = cmd->se_cmd.data_length - offset; 3120 else 3121 xfer_len = 3122 conn->sess->sess_ops->MaxBurstLength - 3123 cmd->next_burst_len; 3124 } else { 3125 int new_data_end = offset + 3126 conn->sess->sess_ops->MaxBurstLength; 3127 3128 if (new_data_end > cmd->se_cmd.data_length) 3129 xfer_len = cmd->se_cmd.data_length - offset; 3130 else 3131 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3132 } 3133 cmd->r2t_offset += xfer_len; 3134 3135 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3136 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3137 } else { 3138 struct iscsi_seq *seq; 3139 3140 seq = iscsit_get_seq_holder_for_r2t(cmd); 3141 if (!seq) { 3142 spin_unlock_bh(&cmd->r2t_lock); 3143 return -1; 3144 } 3145 3146 offset = seq->offset; 3147 xfer_len = seq->xfer_len; 3148 3149 if (cmd->seq_send_order == cmd->seq_count) 3150 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3151 } 3152 cmd->outstanding_r2ts++; 3153 first_r2t = 0; 3154 3155 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3156 spin_unlock_bh(&cmd->r2t_lock); 3157 return -1; 3158 } 3159 3160 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3161 break; 3162 } 3163 spin_unlock_bh(&cmd->r2t_lock); 3164 3165 return 0; 3166 } 3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3168 3169 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3170 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3171 { 3172 if (inc_stat_sn) 3173 cmd->stat_sn = conn->stat_sn++; 3174 3175 atomic_long_inc(&conn->sess->rsp_pdus); 3176 3177 memset(hdr, 0, ISCSI_HDR_LEN); 3178 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3179 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3180 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3181 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3182 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3183 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3184 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3185 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3186 } 3187 hdr->response = cmd->iscsi_response; 3188 hdr->cmd_status = cmd->se_cmd.scsi_status; 3189 hdr->itt = cmd->init_task_tag; 3190 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3191 3192 iscsit_increment_maxcmdsn(cmd, conn->sess); 3193 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3194 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3195 3196 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3197 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3198 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3199 cmd->se_cmd.scsi_status, conn->cid); 3200 } 3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3202 3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3204 { 3205 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3206 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3207 void *data_buf = NULL; 3208 u32 padding = 0, data_buf_len = 0; 3209 3210 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3211 3212 /* 3213 * Attach SENSE DATA payload to iSCSI Response PDU 3214 */ 3215 if (cmd->se_cmd.sense_buffer && 3216 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3217 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3218 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3219 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3220 3221 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3222 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3223 data_buf = cmd->sense_buffer; 3224 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3225 3226 if (padding) { 3227 memset(cmd->sense_buffer + 3228 cmd->se_cmd.scsi_sense_length, 0, padding); 3229 pr_debug("Adding %u bytes of padding to" 3230 " SENSE.\n", padding); 3231 } 3232 3233 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3234 " Response PDU\n", 3235 cmd->se_cmd.scsi_sense_length); 3236 } 3237 3238 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3239 data_buf_len); 3240 } 3241 3242 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3243 { 3244 switch (se_tmr->response) { 3245 case TMR_FUNCTION_COMPLETE: 3246 return ISCSI_TMF_RSP_COMPLETE; 3247 case TMR_TASK_DOES_NOT_EXIST: 3248 return ISCSI_TMF_RSP_NO_TASK; 3249 case TMR_LUN_DOES_NOT_EXIST: 3250 return ISCSI_TMF_RSP_NO_LUN; 3251 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3252 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3253 case TMR_FUNCTION_REJECTED: 3254 default: 3255 return ISCSI_TMF_RSP_REJECTED; 3256 } 3257 } 3258 3259 void 3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3261 struct iscsi_tm_rsp *hdr) 3262 { 3263 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3264 3265 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3266 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3267 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3268 hdr->itt = cmd->init_task_tag; 3269 cmd->stat_sn = conn->stat_sn++; 3270 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3271 3272 iscsit_increment_maxcmdsn(cmd, conn->sess); 3273 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3274 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3275 3276 pr_debug("Built Task Management Response ITT: 0x%08x," 3277 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3278 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3279 } 3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3281 3282 static int 3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3284 { 3285 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3286 3287 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3288 3289 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3290 } 3291 3292 #define SENDTARGETS_BUF_LIMIT 32768U 3293 3294 static int 3295 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3296 enum iscsit_transport_type network_transport, 3297 int skip_bytes, bool *completed) 3298 { 3299 char *payload = NULL; 3300 struct iscsi_conn *conn = cmd->conn; 3301 struct iscsi_portal_group *tpg; 3302 struct iscsi_tiqn *tiqn; 3303 struct iscsi_tpg_np *tpg_np; 3304 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3305 int target_name_printed; 3306 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3307 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3308 bool active; 3309 3310 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3311 SENDTARGETS_BUF_LIMIT); 3312 3313 payload = kzalloc(buffer_len, GFP_KERNEL); 3314 if (!payload) 3315 return -ENOMEM; 3316 3317 /* 3318 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3319 * explicit case.. 3320 */ 3321 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3322 text_ptr = strchr(text_in, '='); 3323 if (!text_ptr) { 3324 pr_err("Unable to locate '=' string in text_in:" 3325 " %s\n", text_in); 3326 kfree(payload); 3327 return -EINVAL; 3328 } 3329 /* 3330 * Skip over '=' character.. 3331 */ 3332 text_ptr += 1; 3333 } 3334 3335 spin_lock(&tiqn_lock); 3336 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3337 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3338 strcmp(tiqn->tiqn, text_ptr)) { 3339 continue; 3340 } 3341 3342 target_name_printed = 0; 3343 3344 spin_lock(&tiqn->tiqn_tpg_lock); 3345 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3346 3347 /* If demo_mode_discovery=0 and generate_node_acls=0 3348 * (demo mode dislabed) do not return 3349 * TargetName+TargetAddress unless a NodeACL exists. 3350 */ 3351 3352 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3353 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3354 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3355 cmd->conn->sess->sess_ops->InitiatorName))) { 3356 continue; 3357 } 3358 3359 spin_lock(&tpg->tpg_state_lock); 3360 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3361 spin_unlock(&tpg->tpg_state_lock); 3362 3363 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3364 continue; 3365 3366 spin_lock(&tpg->tpg_np_lock); 3367 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3368 tpg_np_list) { 3369 struct iscsi_np *np = tpg_np->tpg_np; 3370 struct sockaddr_storage *sockaddr; 3371 3372 if (np->np_network_transport != network_transport) 3373 continue; 3374 3375 if (!target_name_printed) { 3376 len = sprintf(buf, "TargetName=%s", 3377 tiqn->tiqn); 3378 len += 1; 3379 3380 if ((len + payload_len) > buffer_len) { 3381 spin_unlock(&tpg->tpg_np_lock); 3382 spin_unlock(&tiqn->tiqn_tpg_lock); 3383 end_of_buf = 1; 3384 goto eob; 3385 } 3386 3387 if (skip_bytes && len <= skip_bytes) { 3388 skip_bytes -= len; 3389 } else { 3390 memcpy(payload + payload_len, buf, len); 3391 payload_len += len; 3392 target_name_printed = 1; 3393 if (len > skip_bytes) 3394 skip_bytes = 0; 3395 } 3396 } 3397 3398 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3399 sockaddr = &conn->local_sockaddr; 3400 else 3401 sockaddr = &np->np_sockaddr; 3402 3403 len = sprintf(buf, "TargetAddress=" 3404 "%pISpc,%hu", 3405 sockaddr, 3406 tpg->tpgt); 3407 len += 1; 3408 3409 if ((len + payload_len) > buffer_len) { 3410 spin_unlock(&tpg->tpg_np_lock); 3411 spin_unlock(&tiqn->tiqn_tpg_lock); 3412 end_of_buf = 1; 3413 goto eob; 3414 } 3415 3416 if (skip_bytes && len <= skip_bytes) { 3417 skip_bytes -= len; 3418 } else { 3419 memcpy(payload + payload_len, buf, len); 3420 payload_len += len; 3421 if (len > skip_bytes) 3422 skip_bytes = 0; 3423 } 3424 } 3425 spin_unlock(&tpg->tpg_np_lock); 3426 } 3427 spin_unlock(&tiqn->tiqn_tpg_lock); 3428 eob: 3429 if (end_of_buf) { 3430 *completed = false; 3431 break; 3432 } 3433 3434 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3435 break; 3436 } 3437 spin_unlock(&tiqn_lock); 3438 3439 cmd->buf_ptr = payload; 3440 3441 return payload_len; 3442 } 3443 3444 int 3445 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3446 struct iscsi_text_rsp *hdr, 3447 enum iscsit_transport_type network_transport) 3448 { 3449 int text_length, padding; 3450 bool completed = true; 3451 3452 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3453 cmd->read_data_done, 3454 &completed); 3455 if (text_length < 0) 3456 return text_length; 3457 3458 if (completed) { 3459 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3460 } else { 3461 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3462 cmd->read_data_done += text_length; 3463 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3464 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3465 } 3466 hdr->opcode = ISCSI_OP_TEXT_RSP; 3467 padding = ((-text_length) & 3); 3468 hton24(hdr->dlength, text_length); 3469 hdr->itt = cmd->init_task_tag; 3470 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3471 cmd->stat_sn = conn->stat_sn++; 3472 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3473 3474 iscsit_increment_maxcmdsn(cmd, conn->sess); 3475 /* 3476 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3477 * correctly increment MaxCmdSN for each response answering a 3478 * non immediate text request with a valid CmdSN. 3479 */ 3480 cmd->maxcmdsn_inc = 0; 3481 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3482 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3483 3484 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3485 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3486 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3487 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3488 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3489 3490 return text_length + padding; 3491 } 3492 EXPORT_SYMBOL(iscsit_build_text_rsp); 3493 3494 static int iscsit_send_text_rsp( 3495 struct iscsi_cmd *cmd, 3496 struct iscsi_conn *conn) 3497 { 3498 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3499 int text_length; 3500 3501 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3502 conn->conn_transport->transport_type); 3503 if (text_length < 0) 3504 return text_length; 3505 3506 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3507 cmd->buf_ptr, 3508 text_length); 3509 } 3510 3511 void 3512 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3513 struct iscsi_reject *hdr) 3514 { 3515 hdr->opcode = ISCSI_OP_REJECT; 3516 hdr->reason = cmd->reject_reason; 3517 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3518 hton24(hdr->dlength, ISCSI_HDR_LEN); 3519 hdr->ffffffff = cpu_to_be32(0xffffffff); 3520 cmd->stat_sn = conn->stat_sn++; 3521 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3523 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3524 3525 } 3526 EXPORT_SYMBOL(iscsit_build_reject); 3527 3528 static int iscsit_send_reject( 3529 struct iscsi_cmd *cmd, 3530 struct iscsi_conn *conn) 3531 { 3532 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3533 3534 iscsit_build_reject(cmd, conn, hdr); 3535 3536 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3537 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3538 3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3540 cmd->buf_ptr, 3541 ISCSI_HDR_LEN); 3542 } 3543 3544 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3545 { 3546 int ord, cpu; 3547 /* 3548 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3549 * within iscsit_start_kthreads() 3550 * 3551 * Here we use bitmap_id to determine which CPU that this 3552 * iSCSI connection's RX/TX threads will be scheduled to 3553 * execute upon. 3554 */ 3555 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3556 for_each_online_cpu(cpu) { 3557 if (ord-- == 0) { 3558 cpumask_set_cpu(cpu, conn->conn_cpumask); 3559 return; 3560 } 3561 } 3562 /* 3563 * This should never be reached.. 3564 */ 3565 dump_stack(); 3566 cpumask_setall(conn->conn_cpumask); 3567 } 3568 3569 int 3570 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3571 { 3572 int ret; 3573 3574 switch (state) { 3575 case ISTATE_SEND_R2T: 3576 ret = iscsit_send_r2t(cmd, conn); 3577 if (ret < 0) 3578 goto err; 3579 break; 3580 case ISTATE_REMOVE: 3581 spin_lock_bh(&conn->cmd_lock); 3582 list_del_init(&cmd->i_conn_node); 3583 spin_unlock_bh(&conn->cmd_lock); 3584 3585 iscsit_free_cmd(cmd, false); 3586 break; 3587 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3588 iscsit_mod_nopin_response_timer(conn); 3589 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3590 if (ret < 0) 3591 goto err; 3592 break; 3593 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3594 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3595 if (ret < 0) 3596 goto err; 3597 break; 3598 default: 3599 pr_err("Unknown Opcode: 0x%02x ITT:" 3600 " 0x%08x, i_state: %d on CID: %hu\n", 3601 cmd->iscsi_opcode, cmd->init_task_tag, state, 3602 conn->cid); 3603 goto err; 3604 } 3605 3606 return 0; 3607 3608 err: 3609 return -1; 3610 } 3611 EXPORT_SYMBOL(iscsit_immediate_queue); 3612 3613 static int 3614 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3615 { 3616 struct iscsit_transport *t = conn->conn_transport; 3617 struct iscsi_queue_req *qr; 3618 struct iscsi_cmd *cmd; 3619 u8 state; 3620 int ret; 3621 3622 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3623 atomic_set(&conn->check_immediate_queue, 0); 3624 cmd = qr->cmd; 3625 state = qr->state; 3626 kmem_cache_free(lio_qr_cache, qr); 3627 3628 ret = t->iscsit_immediate_queue(conn, cmd, state); 3629 if (ret < 0) 3630 return ret; 3631 } 3632 3633 return 0; 3634 } 3635 3636 int 3637 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3638 { 3639 int ret; 3640 3641 check_rsp_state: 3642 switch (state) { 3643 case ISTATE_SEND_DATAIN: 3644 ret = iscsit_send_datain(cmd, conn); 3645 if (ret < 0) 3646 goto err; 3647 else if (!ret) 3648 /* more drs */ 3649 goto check_rsp_state; 3650 else if (ret == 1) { 3651 /* all done */ 3652 spin_lock_bh(&cmd->istate_lock); 3653 cmd->i_state = ISTATE_SENT_STATUS; 3654 spin_unlock_bh(&cmd->istate_lock); 3655 3656 if (atomic_read(&conn->check_immediate_queue)) 3657 return 1; 3658 3659 return 0; 3660 } else if (ret == 2) { 3661 /* Still must send status, 3662 SCF_TRANSPORT_TASK_SENSE was set */ 3663 spin_lock_bh(&cmd->istate_lock); 3664 cmd->i_state = ISTATE_SEND_STATUS; 3665 spin_unlock_bh(&cmd->istate_lock); 3666 state = ISTATE_SEND_STATUS; 3667 goto check_rsp_state; 3668 } 3669 3670 break; 3671 case ISTATE_SEND_STATUS: 3672 case ISTATE_SEND_STATUS_RECOVERY: 3673 ret = iscsit_send_response(cmd, conn); 3674 break; 3675 case ISTATE_SEND_LOGOUTRSP: 3676 ret = iscsit_send_logout(cmd, conn); 3677 break; 3678 case ISTATE_SEND_ASYNCMSG: 3679 ret = iscsit_send_conn_drop_async_message( 3680 cmd, conn); 3681 break; 3682 case ISTATE_SEND_NOPIN: 3683 ret = iscsit_send_nopin(cmd, conn); 3684 break; 3685 case ISTATE_SEND_REJECT: 3686 ret = iscsit_send_reject(cmd, conn); 3687 break; 3688 case ISTATE_SEND_TASKMGTRSP: 3689 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3690 if (ret != 0) 3691 break; 3692 ret = iscsit_tmr_post_handler(cmd, conn); 3693 if (ret != 0) 3694 iscsit_fall_back_to_erl0(conn->sess); 3695 break; 3696 case ISTATE_SEND_TEXTRSP: 3697 ret = iscsit_send_text_rsp(cmd, conn); 3698 break; 3699 default: 3700 pr_err("Unknown Opcode: 0x%02x ITT:" 3701 " 0x%08x, i_state: %d on CID: %hu\n", 3702 cmd->iscsi_opcode, cmd->init_task_tag, 3703 state, conn->cid); 3704 goto err; 3705 } 3706 if (ret < 0) 3707 goto err; 3708 3709 switch (state) { 3710 case ISTATE_SEND_LOGOUTRSP: 3711 if (!iscsit_logout_post_handler(cmd, conn)) 3712 return -ECONNRESET; 3713 /* fall through */ 3714 case ISTATE_SEND_STATUS: 3715 case ISTATE_SEND_ASYNCMSG: 3716 case ISTATE_SEND_NOPIN: 3717 case ISTATE_SEND_STATUS_RECOVERY: 3718 case ISTATE_SEND_TEXTRSP: 3719 case ISTATE_SEND_TASKMGTRSP: 3720 case ISTATE_SEND_REJECT: 3721 spin_lock_bh(&cmd->istate_lock); 3722 cmd->i_state = ISTATE_SENT_STATUS; 3723 spin_unlock_bh(&cmd->istate_lock); 3724 break; 3725 default: 3726 pr_err("Unknown Opcode: 0x%02x ITT:" 3727 " 0x%08x, i_state: %d on CID: %hu\n", 3728 cmd->iscsi_opcode, cmd->init_task_tag, 3729 cmd->i_state, conn->cid); 3730 goto err; 3731 } 3732 3733 if (atomic_read(&conn->check_immediate_queue)) 3734 return 1; 3735 3736 return 0; 3737 3738 err: 3739 return -1; 3740 } 3741 EXPORT_SYMBOL(iscsit_response_queue); 3742 3743 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3744 { 3745 struct iscsit_transport *t = conn->conn_transport; 3746 struct iscsi_queue_req *qr; 3747 struct iscsi_cmd *cmd; 3748 u8 state; 3749 int ret; 3750 3751 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3752 cmd = qr->cmd; 3753 state = qr->state; 3754 kmem_cache_free(lio_qr_cache, qr); 3755 3756 ret = t->iscsit_response_queue(conn, cmd, state); 3757 if (ret == 1 || ret < 0) 3758 return ret; 3759 } 3760 3761 return 0; 3762 } 3763 3764 int iscsi_target_tx_thread(void *arg) 3765 { 3766 int ret = 0; 3767 struct iscsi_conn *conn = arg; 3768 bool conn_freed = false; 3769 3770 /* 3771 * Allow ourselves to be interrupted by SIGINT so that a 3772 * connection recovery / failure event can be triggered externally. 3773 */ 3774 allow_signal(SIGINT); 3775 3776 while (!kthread_should_stop()) { 3777 /* 3778 * Ensure that both TX and RX per connection kthreads 3779 * are scheduled to run on the same CPU. 3780 */ 3781 iscsit_thread_check_cpumask(conn, current, 1); 3782 3783 wait_event_interruptible(conn->queues_wq, 3784 !iscsit_conn_all_queues_empty(conn)); 3785 3786 if (signal_pending(current)) 3787 goto transport_err; 3788 3789 get_immediate: 3790 ret = iscsit_handle_immediate_queue(conn); 3791 if (ret < 0) 3792 goto transport_err; 3793 3794 ret = iscsit_handle_response_queue(conn); 3795 if (ret == 1) { 3796 goto get_immediate; 3797 } else if (ret == -ECONNRESET) { 3798 conn_freed = true; 3799 goto out; 3800 } else if (ret < 0) { 3801 goto transport_err; 3802 } 3803 } 3804 3805 transport_err: 3806 /* 3807 * Avoid the normal connection failure code-path if this connection 3808 * is still within LOGIN mode, and iscsi_np process context is 3809 * responsible for cleaning up the early connection failure. 3810 */ 3811 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3812 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3813 out: 3814 if (!conn_freed) { 3815 while (!kthread_should_stop()) { 3816 msleep(100); 3817 } 3818 } 3819 return 0; 3820 } 3821 3822 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3823 { 3824 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3825 struct iscsi_cmd *cmd; 3826 int ret = 0; 3827 3828 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3829 case ISCSI_OP_SCSI_CMD: 3830 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3831 if (!cmd) 3832 goto reject; 3833 3834 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3835 break; 3836 case ISCSI_OP_SCSI_DATA_OUT: 3837 ret = iscsit_handle_data_out(conn, buf); 3838 break; 3839 case ISCSI_OP_NOOP_OUT: 3840 cmd = NULL; 3841 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3842 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3843 if (!cmd) 3844 goto reject; 3845 } 3846 ret = iscsit_handle_nop_out(conn, cmd, buf); 3847 break; 3848 case ISCSI_OP_SCSI_TMFUNC: 3849 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3850 if (!cmd) 3851 goto reject; 3852 3853 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3854 break; 3855 case ISCSI_OP_TEXT: 3856 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3857 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3858 if (!cmd) 3859 goto reject; 3860 } else { 3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3862 if (!cmd) 3863 goto reject; 3864 } 3865 3866 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3867 break; 3868 case ISCSI_OP_LOGOUT: 3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3870 if (!cmd) 3871 goto reject; 3872 3873 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3874 if (ret > 0) 3875 wait_for_completion_timeout(&conn->conn_logout_comp, 3876 SECONDS_FOR_LOGOUT_COMP * HZ); 3877 break; 3878 case ISCSI_OP_SNACK: 3879 ret = iscsit_handle_snack(conn, buf); 3880 break; 3881 default: 3882 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3883 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3884 pr_err("Cannot recover from unknown" 3885 " opcode while ERL=0, closing iSCSI connection.\n"); 3886 return -1; 3887 } 3888 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3889 " closing iSCSI connection.\n"); 3890 ret = -1; 3891 break; 3892 } 3893 3894 return ret; 3895 reject: 3896 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3897 } 3898 3899 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3900 { 3901 bool ret; 3902 3903 spin_lock_bh(&conn->state_lock); 3904 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3905 spin_unlock_bh(&conn->state_lock); 3906 3907 return ret; 3908 } 3909 3910 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3911 { 3912 int ret; 3913 u8 buffer[ISCSI_HDR_LEN], opcode; 3914 u32 checksum = 0, digest = 0; 3915 struct kvec iov; 3916 3917 while (!kthread_should_stop()) { 3918 /* 3919 * Ensure that both TX and RX per connection kthreads 3920 * are scheduled to run on the same CPU. 3921 */ 3922 iscsit_thread_check_cpumask(conn, current, 0); 3923 3924 memset(buffer, 0, ISCSI_HDR_LEN); 3925 memset(&iov, 0, sizeof(struct kvec)); 3926 3927 iov.iov_base = buffer; 3928 iov.iov_len = ISCSI_HDR_LEN; 3929 3930 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3931 if (ret != ISCSI_HDR_LEN) { 3932 iscsit_rx_thread_wait_for_tcp(conn); 3933 return; 3934 } 3935 3936 if (conn->conn_ops->HeaderDigest) { 3937 iov.iov_base = &digest; 3938 iov.iov_len = ISCSI_CRC_LEN; 3939 3940 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3941 if (ret != ISCSI_CRC_LEN) { 3942 iscsit_rx_thread_wait_for_tcp(conn); 3943 return; 3944 } 3945 3946 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3947 ISCSI_HDR_LEN, 0, NULL, 3948 &checksum); 3949 3950 if (digest != checksum) { 3951 pr_err("HeaderDigest CRC32C failed," 3952 " received 0x%08x, computed 0x%08x\n", 3953 digest, checksum); 3954 /* 3955 * Set the PDU to 0xff so it will intentionally 3956 * hit default in the switch below. 3957 */ 3958 memset(buffer, 0xff, ISCSI_HDR_LEN); 3959 atomic_long_inc(&conn->sess->conn_digest_errors); 3960 } else { 3961 pr_debug("Got HeaderDigest CRC32C" 3962 " 0x%08x\n", checksum); 3963 } 3964 } 3965 3966 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3967 return; 3968 3969 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3970 3971 if (conn->sess->sess_ops->SessionType && 3972 ((!(opcode & ISCSI_OP_TEXT)) || 3973 (!(opcode & ISCSI_OP_LOGOUT)))) { 3974 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3975 " while in Discovery Session, rejecting.\n", opcode); 3976 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 3977 buffer); 3978 return; 3979 } 3980 3981 ret = iscsi_target_rx_opcode(conn, buffer); 3982 if (ret < 0) 3983 return; 3984 } 3985 } 3986 3987 int iscsi_target_rx_thread(void *arg) 3988 { 3989 int rc; 3990 struct iscsi_conn *conn = arg; 3991 bool conn_freed = false; 3992 3993 /* 3994 * Allow ourselves to be interrupted by SIGINT so that a 3995 * connection recovery / failure event can be triggered externally. 3996 */ 3997 allow_signal(SIGINT); 3998 /* 3999 * Wait for iscsi_post_login_handler() to complete before allowing 4000 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4001 */ 4002 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4003 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4004 goto out; 4005 4006 if (!conn->conn_transport->iscsit_get_rx_pdu) 4007 return 0; 4008 4009 conn->conn_transport->iscsit_get_rx_pdu(conn); 4010 4011 if (!signal_pending(current)) 4012 atomic_set(&conn->transport_failed, 1); 4013 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4014 4015 out: 4016 if (!conn_freed) { 4017 while (!kthread_should_stop()) { 4018 msleep(100); 4019 } 4020 } 4021 4022 return 0; 4023 } 4024 4025 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4026 { 4027 LIST_HEAD(tmp_list); 4028 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4029 struct iscsi_session *sess = conn->sess; 4030 /* 4031 * We expect this function to only ever be called from either RX or TX 4032 * thread context via iscsit_close_connection() once the other context 4033 * has been reset -> returned sleeping pre-handler state. 4034 */ 4035 spin_lock_bh(&conn->cmd_lock); 4036 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4037 4038 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4039 struct se_cmd *se_cmd = &cmd->se_cmd; 4040 4041 if (se_cmd->se_tfo != NULL) { 4042 spin_lock(&se_cmd->t_state_lock); 4043 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4044 spin_unlock(&se_cmd->t_state_lock); 4045 } 4046 } 4047 spin_unlock_bh(&conn->cmd_lock); 4048 4049 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4050 list_del_init(&cmd->i_conn_node); 4051 4052 iscsit_increment_maxcmdsn(cmd, sess); 4053 iscsit_free_cmd(cmd, true); 4054 4055 } 4056 } 4057 4058 static void iscsit_stop_timers_for_cmds( 4059 struct iscsi_conn *conn) 4060 { 4061 struct iscsi_cmd *cmd; 4062 4063 spin_lock_bh(&conn->cmd_lock); 4064 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4065 if (cmd->data_direction == DMA_TO_DEVICE) 4066 iscsit_stop_dataout_timer(cmd); 4067 } 4068 spin_unlock_bh(&conn->cmd_lock); 4069 } 4070 4071 int iscsit_close_connection( 4072 struct iscsi_conn *conn) 4073 { 4074 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4075 struct iscsi_session *sess = conn->sess; 4076 4077 pr_debug("Closing iSCSI connection CID %hu on SID:" 4078 " %u\n", conn->cid, sess->sid); 4079 /* 4080 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4081 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4082 * sleeping and the logout response never got sent because the 4083 * connection failed. 4084 * 4085 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4086 * to signal logout response TX interrupt completion. Go ahead and skip 4087 * this for iser since isert_rx_opcode() does not wait on logout failure, 4088 * and to avoid iscsi_conn pointer dereference in iser-target code. 4089 */ 4090 if (!conn->conn_transport->rdma_shutdown) 4091 complete(&conn->conn_logout_comp); 4092 4093 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4094 if (conn->tx_thread && 4095 cmpxchg(&conn->tx_thread_active, true, false)) { 4096 send_sig(SIGINT, conn->tx_thread, 1); 4097 kthread_stop(conn->tx_thread); 4098 } 4099 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4100 if (conn->rx_thread && 4101 cmpxchg(&conn->rx_thread_active, true, false)) { 4102 send_sig(SIGINT, conn->rx_thread, 1); 4103 kthread_stop(conn->rx_thread); 4104 } 4105 } 4106 4107 spin_lock(&iscsit_global->ts_bitmap_lock); 4108 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4109 get_order(1)); 4110 spin_unlock(&iscsit_global->ts_bitmap_lock); 4111 4112 iscsit_stop_timers_for_cmds(conn); 4113 iscsit_stop_nopin_response_timer(conn); 4114 iscsit_stop_nopin_timer(conn); 4115 4116 if (conn->conn_transport->iscsit_wait_conn) 4117 conn->conn_transport->iscsit_wait_conn(conn); 4118 4119 /* 4120 * During Connection recovery drop unacknowledged out of order 4121 * commands for this connection, and prepare the other commands 4122 * for reallegiance. 4123 * 4124 * During normal operation clear the out of order commands (but 4125 * do not free the struct iscsi_ooo_cmdsn's) and release all 4126 * struct iscsi_cmds. 4127 */ 4128 if (atomic_read(&conn->connection_recovery)) { 4129 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4130 iscsit_prepare_cmds_for_reallegiance(conn); 4131 } else { 4132 iscsit_clear_ooo_cmdsns_for_conn(conn); 4133 iscsit_release_commands_from_conn(conn); 4134 } 4135 iscsit_free_queue_reqs_for_conn(conn); 4136 4137 /* 4138 * Handle decrementing session or connection usage count if 4139 * a logout response was not able to be sent because the 4140 * connection failed. Fall back to Session Recovery here. 4141 */ 4142 if (atomic_read(&conn->conn_logout_remove)) { 4143 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4144 iscsit_dec_conn_usage_count(conn); 4145 iscsit_dec_session_usage_count(sess); 4146 } 4147 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4148 iscsit_dec_conn_usage_count(conn); 4149 4150 atomic_set(&conn->conn_logout_remove, 0); 4151 atomic_set(&sess->session_reinstatement, 0); 4152 atomic_set(&sess->session_fall_back_to_erl0, 1); 4153 } 4154 4155 spin_lock_bh(&sess->conn_lock); 4156 list_del(&conn->conn_list); 4157 4158 /* 4159 * Attempt to let the Initiator know this connection failed by 4160 * sending an Connection Dropped Async Message on another 4161 * active connection. 4162 */ 4163 if (atomic_read(&conn->connection_recovery)) 4164 iscsit_build_conn_drop_async_message(conn); 4165 4166 spin_unlock_bh(&sess->conn_lock); 4167 4168 /* 4169 * If connection reinstatement is being performed on this connection, 4170 * up the connection reinstatement semaphore that is being blocked on 4171 * in iscsit_cause_connection_reinstatement(). 4172 */ 4173 spin_lock_bh(&conn->state_lock); 4174 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4175 spin_unlock_bh(&conn->state_lock); 4176 complete(&conn->conn_wait_comp); 4177 wait_for_completion(&conn->conn_post_wait_comp); 4178 spin_lock_bh(&conn->state_lock); 4179 } 4180 4181 /* 4182 * If connection reinstatement is being performed on this connection 4183 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4184 * connection wait rcfr semaphore that is being blocked on 4185 * an iscsit_connection_reinstatement_rcfr(). 4186 */ 4187 if (atomic_read(&conn->connection_wait_rcfr)) { 4188 spin_unlock_bh(&conn->state_lock); 4189 complete(&conn->conn_wait_rcfr_comp); 4190 wait_for_completion(&conn->conn_post_wait_comp); 4191 spin_lock_bh(&conn->state_lock); 4192 } 4193 atomic_set(&conn->connection_reinstatement, 1); 4194 spin_unlock_bh(&conn->state_lock); 4195 4196 /* 4197 * If any other processes are accessing this connection pointer we 4198 * must wait until they have completed. 4199 */ 4200 iscsit_check_conn_usage_count(conn); 4201 4202 ahash_request_free(conn->conn_tx_hash); 4203 if (conn->conn_rx_hash) { 4204 struct crypto_ahash *tfm; 4205 4206 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4207 ahash_request_free(conn->conn_rx_hash); 4208 crypto_free_ahash(tfm); 4209 } 4210 4211 free_cpumask_var(conn->conn_cpumask); 4212 4213 kfree(conn->conn_ops); 4214 conn->conn_ops = NULL; 4215 4216 if (conn->sock) 4217 sock_release(conn->sock); 4218 4219 if (conn->conn_transport->iscsit_free_conn) 4220 conn->conn_transport->iscsit_free_conn(conn); 4221 4222 iscsit_put_transport(conn->conn_transport); 4223 4224 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4225 conn->conn_state = TARG_CONN_STATE_FREE; 4226 kfree(conn); 4227 4228 spin_lock_bh(&sess->conn_lock); 4229 atomic_dec(&sess->nconn); 4230 pr_debug("Decremented iSCSI connection count to %hu from node:" 4231 " %s\n", atomic_read(&sess->nconn), 4232 sess->sess_ops->InitiatorName); 4233 /* 4234 * Make sure that if one connection fails in an non ERL=2 iSCSI 4235 * Session that they all fail. 4236 */ 4237 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4238 !atomic_read(&sess->session_logout)) 4239 atomic_set(&sess->session_fall_back_to_erl0, 1); 4240 4241 /* 4242 * If this was not the last connection in the session, and we are 4243 * performing session reinstatement or falling back to ERL=0, call 4244 * iscsit_stop_session() without sleeping to shutdown the other 4245 * active connections. 4246 */ 4247 if (atomic_read(&sess->nconn)) { 4248 if (!atomic_read(&sess->session_reinstatement) && 4249 !atomic_read(&sess->session_fall_back_to_erl0)) { 4250 spin_unlock_bh(&sess->conn_lock); 4251 return 0; 4252 } 4253 if (!atomic_read(&sess->session_stop_active)) { 4254 atomic_set(&sess->session_stop_active, 1); 4255 spin_unlock_bh(&sess->conn_lock); 4256 iscsit_stop_session(sess, 0, 0); 4257 return 0; 4258 } 4259 spin_unlock_bh(&sess->conn_lock); 4260 return 0; 4261 } 4262 4263 /* 4264 * If this was the last connection in the session and one of the 4265 * following is occurring: 4266 * 4267 * Session Reinstatement is not being performed, and are falling back 4268 * to ERL=0 call iscsit_close_session(). 4269 * 4270 * Session Logout was requested. iscsit_close_session() will be called 4271 * elsewhere. 4272 * 4273 * Session Continuation is not being performed, start the Time2Retain 4274 * handler and check if sleep_on_sess_wait_sem is active. 4275 */ 4276 if (!atomic_read(&sess->session_reinstatement) && 4277 atomic_read(&sess->session_fall_back_to_erl0)) { 4278 spin_unlock_bh(&sess->conn_lock); 4279 iscsit_close_session(sess); 4280 4281 return 0; 4282 } else if (atomic_read(&sess->session_logout)) { 4283 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4284 sess->session_state = TARG_SESS_STATE_FREE; 4285 spin_unlock_bh(&sess->conn_lock); 4286 4287 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4288 complete(&sess->session_wait_comp); 4289 4290 return 0; 4291 } else { 4292 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4293 sess->session_state = TARG_SESS_STATE_FAILED; 4294 4295 if (!atomic_read(&sess->session_continuation)) { 4296 spin_unlock_bh(&sess->conn_lock); 4297 iscsit_start_time2retain_handler(sess); 4298 } else 4299 spin_unlock_bh(&sess->conn_lock); 4300 4301 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4302 complete(&sess->session_wait_comp); 4303 4304 return 0; 4305 } 4306 } 4307 4308 /* 4309 * If the iSCSI Session for the iSCSI Initiator Node exists, 4310 * forcefully shutdown the iSCSI NEXUS. 4311 */ 4312 int iscsit_close_session(struct iscsi_session *sess) 4313 { 4314 struct iscsi_portal_group *tpg = sess->tpg; 4315 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4316 4317 if (atomic_read(&sess->nconn)) { 4318 pr_err("%d connection(s) still exist for iSCSI session" 4319 " to %s\n", atomic_read(&sess->nconn), 4320 sess->sess_ops->InitiatorName); 4321 BUG(); 4322 } 4323 4324 spin_lock_bh(&se_tpg->session_lock); 4325 atomic_set(&sess->session_logout, 1); 4326 atomic_set(&sess->session_reinstatement, 1); 4327 iscsit_stop_time2retain_timer(sess); 4328 spin_unlock_bh(&se_tpg->session_lock); 4329 4330 /* 4331 * transport_deregister_session_configfs() will clear the 4332 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4333 * can be setting it again with __transport_register_session() in 4334 * iscsi_post_login_handler() again after the iscsit_stop_session() 4335 * completes in iscsi_np context. 4336 */ 4337 transport_deregister_session_configfs(sess->se_sess); 4338 4339 /* 4340 * If any other processes are accessing this session pointer we must 4341 * wait until they have completed. If we are in an interrupt (the 4342 * time2retain handler) and contain and active session usage count we 4343 * restart the timer and exit. 4344 */ 4345 if (!in_interrupt()) { 4346 if (iscsit_check_session_usage_count(sess) == 1) 4347 iscsit_stop_session(sess, 1, 1); 4348 } else { 4349 if (iscsit_check_session_usage_count(sess) == 2) { 4350 atomic_set(&sess->session_logout, 0); 4351 iscsit_start_time2retain_handler(sess); 4352 return 0; 4353 } 4354 } 4355 4356 transport_deregister_session(sess->se_sess); 4357 4358 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4359 iscsit_free_connection_recovery_entires(sess); 4360 4361 iscsit_free_all_ooo_cmdsns(sess); 4362 4363 spin_lock_bh(&se_tpg->session_lock); 4364 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4365 sess->session_state = TARG_SESS_STATE_FREE; 4366 pr_debug("Released iSCSI session from node: %s\n", 4367 sess->sess_ops->InitiatorName); 4368 tpg->nsessions--; 4369 if (tpg->tpg_tiqn) 4370 tpg->tpg_tiqn->tiqn_nsessions--; 4371 4372 pr_debug("Decremented number of active iSCSI Sessions on" 4373 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4374 4375 ida_free(&sess_ida, sess->session_index); 4376 kfree(sess->sess_ops); 4377 sess->sess_ops = NULL; 4378 spin_unlock_bh(&se_tpg->session_lock); 4379 4380 kfree(sess); 4381 return 0; 4382 } 4383 4384 static void iscsit_logout_post_handler_closesession( 4385 struct iscsi_conn *conn) 4386 { 4387 struct iscsi_session *sess = conn->sess; 4388 int sleep = 1; 4389 /* 4390 * Traditional iscsi/tcp will invoke this logic from TX thread 4391 * context during session logout, so clear tx_thread_active and 4392 * sleep if iscsit_close_connection() has not already occured. 4393 * 4394 * Since iser-target invokes this logic from it's own workqueue, 4395 * always sleep waiting for RX/TX thread shutdown to complete 4396 * within iscsit_close_connection(). 4397 */ 4398 if (!conn->conn_transport->rdma_shutdown) { 4399 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4400 if (!sleep) 4401 return; 4402 } 4403 4404 atomic_set(&conn->conn_logout_remove, 0); 4405 complete(&conn->conn_logout_comp); 4406 4407 iscsit_dec_conn_usage_count(conn); 4408 iscsit_stop_session(sess, sleep, sleep); 4409 iscsit_dec_session_usage_count(sess); 4410 iscsit_close_session(sess); 4411 } 4412 4413 static void iscsit_logout_post_handler_samecid( 4414 struct iscsi_conn *conn) 4415 { 4416 int sleep = 1; 4417 4418 if (!conn->conn_transport->rdma_shutdown) { 4419 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4420 if (!sleep) 4421 return; 4422 } 4423 4424 atomic_set(&conn->conn_logout_remove, 0); 4425 complete(&conn->conn_logout_comp); 4426 4427 iscsit_cause_connection_reinstatement(conn, sleep); 4428 iscsit_dec_conn_usage_count(conn); 4429 } 4430 4431 static void iscsit_logout_post_handler_diffcid( 4432 struct iscsi_conn *conn, 4433 u16 cid) 4434 { 4435 struct iscsi_conn *l_conn; 4436 struct iscsi_session *sess = conn->sess; 4437 bool conn_found = false; 4438 4439 if (!sess) 4440 return; 4441 4442 spin_lock_bh(&sess->conn_lock); 4443 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4444 if (l_conn->cid == cid) { 4445 iscsit_inc_conn_usage_count(l_conn); 4446 conn_found = true; 4447 break; 4448 } 4449 } 4450 spin_unlock_bh(&sess->conn_lock); 4451 4452 if (!conn_found) 4453 return; 4454 4455 if (l_conn->sock) 4456 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4457 4458 spin_lock_bh(&l_conn->state_lock); 4459 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4460 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4461 spin_unlock_bh(&l_conn->state_lock); 4462 4463 iscsit_cause_connection_reinstatement(l_conn, 1); 4464 iscsit_dec_conn_usage_count(l_conn); 4465 } 4466 4467 /* 4468 * Return of 0 causes the TX thread to restart. 4469 */ 4470 int iscsit_logout_post_handler( 4471 struct iscsi_cmd *cmd, 4472 struct iscsi_conn *conn) 4473 { 4474 int ret = 0; 4475 4476 switch (cmd->logout_reason) { 4477 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4478 switch (cmd->logout_response) { 4479 case ISCSI_LOGOUT_SUCCESS: 4480 case ISCSI_LOGOUT_CLEANUP_FAILED: 4481 default: 4482 iscsit_logout_post_handler_closesession(conn); 4483 break; 4484 } 4485 ret = 0; 4486 break; 4487 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4488 if (conn->cid == cmd->logout_cid) { 4489 switch (cmd->logout_response) { 4490 case ISCSI_LOGOUT_SUCCESS: 4491 case ISCSI_LOGOUT_CLEANUP_FAILED: 4492 default: 4493 iscsit_logout_post_handler_samecid(conn); 4494 break; 4495 } 4496 ret = 0; 4497 } else { 4498 switch (cmd->logout_response) { 4499 case ISCSI_LOGOUT_SUCCESS: 4500 iscsit_logout_post_handler_diffcid(conn, 4501 cmd->logout_cid); 4502 break; 4503 case ISCSI_LOGOUT_CID_NOT_FOUND: 4504 case ISCSI_LOGOUT_CLEANUP_FAILED: 4505 default: 4506 break; 4507 } 4508 ret = 1; 4509 } 4510 break; 4511 case ISCSI_LOGOUT_REASON_RECOVERY: 4512 switch (cmd->logout_response) { 4513 case ISCSI_LOGOUT_SUCCESS: 4514 case ISCSI_LOGOUT_CID_NOT_FOUND: 4515 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4516 case ISCSI_LOGOUT_CLEANUP_FAILED: 4517 default: 4518 break; 4519 } 4520 ret = 1; 4521 break; 4522 default: 4523 break; 4524 4525 } 4526 return ret; 4527 } 4528 EXPORT_SYMBOL(iscsit_logout_post_handler); 4529 4530 void iscsit_fail_session(struct iscsi_session *sess) 4531 { 4532 struct iscsi_conn *conn; 4533 4534 spin_lock_bh(&sess->conn_lock); 4535 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4536 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4537 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4538 } 4539 spin_unlock_bh(&sess->conn_lock); 4540 4541 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4542 sess->session_state = TARG_SESS_STATE_FAILED; 4543 } 4544 4545 int iscsit_free_session(struct iscsi_session *sess) 4546 { 4547 u16 conn_count = atomic_read(&sess->nconn); 4548 struct iscsi_conn *conn, *conn_tmp = NULL; 4549 int is_last; 4550 4551 spin_lock_bh(&sess->conn_lock); 4552 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4553 4554 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4555 conn_list) { 4556 if (conn_count == 0) 4557 break; 4558 4559 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4560 is_last = 1; 4561 } else { 4562 iscsit_inc_conn_usage_count(conn_tmp); 4563 is_last = 0; 4564 } 4565 iscsit_inc_conn_usage_count(conn); 4566 4567 spin_unlock_bh(&sess->conn_lock); 4568 iscsit_cause_connection_reinstatement(conn, 1); 4569 spin_lock_bh(&sess->conn_lock); 4570 4571 iscsit_dec_conn_usage_count(conn); 4572 if (is_last == 0) 4573 iscsit_dec_conn_usage_count(conn_tmp); 4574 4575 conn_count--; 4576 } 4577 4578 if (atomic_read(&sess->nconn)) { 4579 spin_unlock_bh(&sess->conn_lock); 4580 wait_for_completion(&sess->session_wait_comp); 4581 } else 4582 spin_unlock_bh(&sess->conn_lock); 4583 4584 iscsit_close_session(sess); 4585 return 0; 4586 } 4587 4588 void iscsit_stop_session( 4589 struct iscsi_session *sess, 4590 int session_sleep, 4591 int connection_sleep) 4592 { 4593 u16 conn_count = atomic_read(&sess->nconn); 4594 struct iscsi_conn *conn, *conn_tmp = NULL; 4595 int is_last; 4596 4597 spin_lock_bh(&sess->conn_lock); 4598 if (session_sleep) 4599 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4600 4601 if (connection_sleep) { 4602 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4603 conn_list) { 4604 if (conn_count == 0) 4605 break; 4606 4607 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4608 is_last = 1; 4609 } else { 4610 iscsit_inc_conn_usage_count(conn_tmp); 4611 is_last = 0; 4612 } 4613 iscsit_inc_conn_usage_count(conn); 4614 4615 spin_unlock_bh(&sess->conn_lock); 4616 iscsit_cause_connection_reinstatement(conn, 1); 4617 spin_lock_bh(&sess->conn_lock); 4618 4619 iscsit_dec_conn_usage_count(conn); 4620 if (is_last == 0) 4621 iscsit_dec_conn_usage_count(conn_tmp); 4622 conn_count--; 4623 } 4624 } else { 4625 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4626 iscsit_cause_connection_reinstatement(conn, 0); 4627 } 4628 4629 if (session_sleep && atomic_read(&sess->nconn)) { 4630 spin_unlock_bh(&sess->conn_lock); 4631 wait_for_completion(&sess->session_wait_comp); 4632 } else 4633 spin_unlock_bh(&sess->conn_lock); 4634 } 4635 4636 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4637 { 4638 struct iscsi_session *sess; 4639 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4640 struct se_session *se_sess, *se_sess_tmp; 4641 LIST_HEAD(free_list); 4642 int session_count = 0; 4643 4644 spin_lock_bh(&se_tpg->session_lock); 4645 if (tpg->nsessions && !force) { 4646 spin_unlock_bh(&se_tpg->session_lock); 4647 return -1; 4648 } 4649 4650 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4651 sess_list) { 4652 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4653 4654 spin_lock(&sess->conn_lock); 4655 if (atomic_read(&sess->session_fall_back_to_erl0) || 4656 atomic_read(&sess->session_logout) || 4657 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4658 spin_unlock(&sess->conn_lock); 4659 continue; 4660 } 4661 atomic_set(&sess->session_reinstatement, 1); 4662 atomic_set(&sess->session_fall_back_to_erl0, 1); 4663 spin_unlock(&sess->conn_lock); 4664 4665 list_move_tail(&se_sess->sess_list, &free_list); 4666 } 4667 spin_unlock_bh(&se_tpg->session_lock); 4668 4669 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4670 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4671 4672 iscsit_free_session(sess); 4673 session_count++; 4674 } 4675 4676 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4677 " Group: %hu\n", session_count, tpg->tpgt); 4678 return 0; 4679 } 4680 4681 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4682 MODULE_VERSION("4.1.x"); 4683 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4684 MODULE_LICENSE("GPL"); 4685 4686 module_init(iscsi_target_init_module); 4687 module_exit(iscsi_target_cleanup_module); 4688