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 struct idr sess_idr; 61 struct mutex auth_id_lock; 62 spinlock_t sess_idr_lock; 63 64 struct iscsit_global *iscsit_global; 65 66 struct kmem_cache *lio_qr_cache; 67 struct kmem_cache *lio_dr_cache; 68 struct kmem_cache *lio_ooo_cache; 69 struct kmem_cache *lio_r2t_cache; 70 71 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 72 struct iscsi_scsi_req *, u32); 73 74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 75 { 76 struct iscsi_tiqn *tiqn = NULL; 77 78 spin_lock(&tiqn_lock); 79 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 80 if (!strcmp(tiqn->tiqn, buf)) { 81 82 spin_lock(&tiqn->tiqn_state_lock); 83 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 84 tiqn->tiqn_access_count++; 85 spin_unlock(&tiqn->tiqn_state_lock); 86 spin_unlock(&tiqn_lock); 87 return tiqn; 88 } 89 spin_unlock(&tiqn->tiqn_state_lock); 90 } 91 } 92 spin_unlock(&tiqn_lock); 93 94 return NULL; 95 } 96 97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 98 { 99 spin_lock(&tiqn->tiqn_state_lock); 100 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 101 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 102 spin_unlock(&tiqn->tiqn_state_lock); 103 return 0; 104 } 105 spin_unlock(&tiqn->tiqn_state_lock); 106 107 return -1; 108 } 109 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 111 { 112 spin_lock(&tiqn->tiqn_state_lock); 113 tiqn->tiqn_access_count--; 114 spin_unlock(&tiqn->tiqn_state_lock); 115 } 116 117 /* 118 * Note that IQN formatting is expected to be done in userspace, and 119 * no explict IQN format checks are done here. 120 */ 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 122 { 123 struct iscsi_tiqn *tiqn = NULL; 124 int ret; 125 126 if (strlen(buf) >= ISCSI_IQN_LEN) { 127 pr_err("Target IQN exceeds %d bytes\n", 128 ISCSI_IQN_LEN); 129 return ERR_PTR(-EINVAL); 130 } 131 132 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); 133 if (!tiqn) 134 return ERR_PTR(-ENOMEM); 135 136 sprintf(tiqn->tiqn, "%s", buf); 137 INIT_LIST_HEAD(&tiqn->tiqn_list); 138 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 139 spin_lock_init(&tiqn->tiqn_state_lock); 140 spin_lock_init(&tiqn->tiqn_tpg_lock); 141 spin_lock_init(&tiqn->sess_err_stats.lock); 142 spin_lock_init(&tiqn->login_stats.lock); 143 spin_lock_init(&tiqn->logout_stats.lock); 144 145 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 146 147 idr_preload(GFP_KERNEL); 148 spin_lock(&tiqn_lock); 149 150 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 151 if (ret < 0) { 152 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 153 spin_unlock(&tiqn_lock); 154 idr_preload_end(); 155 kfree(tiqn); 156 return ERR_PTR(ret); 157 } 158 tiqn->tiqn_index = ret; 159 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 160 161 spin_unlock(&tiqn_lock); 162 idr_preload_end(); 163 164 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 165 166 return tiqn; 167 168 } 169 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 171 { 172 /* 173 * Wait for accesses to said struct iscsi_tiqn to end. 174 */ 175 spin_lock(&tiqn->tiqn_state_lock); 176 while (tiqn->tiqn_access_count != 0) { 177 spin_unlock(&tiqn->tiqn_state_lock); 178 msleep(10); 179 spin_lock(&tiqn->tiqn_state_lock); 180 } 181 spin_unlock(&tiqn->tiqn_state_lock); 182 } 183 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 185 { 186 /* 187 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 188 * while holding tiqn->tiqn_state_lock. This means that all subsequent 189 * attempts to access this struct iscsi_tiqn will fail from both transport 190 * fabric and control code paths. 191 */ 192 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 193 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 194 return; 195 } 196 197 iscsit_wait_for_tiqn(tiqn); 198 199 spin_lock(&tiqn_lock); 200 list_del(&tiqn->tiqn_list); 201 idr_remove(&tiqn_idr, tiqn->tiqn_index); 202 spin_unlock(&tiqn_lock); 203 204 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 205 tiqn->tiqn); 206 kfree(tiqn); 207 } 208 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 210 { 211 int ret; 212 /* 213 * Determine if the network portal is accepting storage traffic. 214 */ 215 spin_lock_bh(&np->np_thread_lock); 216 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 217 spin_unlock_bh(&np->np_thread_lock); 218 return -1; 219 } 220 spin_unlock_bh(&np->np_thread_lock); 221 /* 222 * Determine if the portal group is accepting storage traffic. 223 */ 224 spin_lock_bh(&tpg->tpg_state_lock); 225 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 226 spin_unlock_bh(&tpg->tpg_state_lock); 227 return -1; 228 } 229 spin_unlock_bh(&tpg->tpg_state_lock); 230 231 /* 232 * Here we serialize access across the TIQN+TPG Tuple. 233 */ 234 ret = down_interruptible(&tpg->np_login_sem); 235 if (ret != 0) 236 return -1; 237 238 spin_lock_bh(&tpg->tpg_state_lock); 239 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 240 spin_unlock_bh(&tpg->tpg_state_lock); 241 up(&tpg->np_login_sem); 242 return -1; 243 } 244 spin_unlock_bh(&tpg->tpg_state_lock); 245 246 return 0; 247 } 248 249 void iscsit_login_kref_put(struct kref *kref) 250 { 251 struct iscsi_tpg_np *tpg_np = container_of(kref, 252 struct iscsi_tpg_np, tpg_np_kref); 253 254 complete(&tpg_np->tpg_np_comp); 255 } 256 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 258 struct iscsi_tpg_np *tpg_np) 259 { 260 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 261 262 up(&tpg->np_login_sem); 263 264 if (tpg_np) 265 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 266 267 if (tiqn) 268 iscsit_put_tiqn_for_login(tiqn); 269 270 return 0; 271 } 272 273 bool iscsit_check_np_match( 274 struct sockaddr_storage *sockaddr, 275 struct iscsi_np *np, 276 int network_transport) 277 { 278 struct sockaddr_in *sock_in, *sock_in_e; 279 struct sockaddr_in6 *sock_in6, *sock_in6_e; 280 bool ip_match = false; 281 u16 port, port_e; 282 283 if (sockaddr->ss_family == AF_INET6) { 284 sock_in6 = (struct sockaddr_in6 *)sockaddr; 285 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 286 287 if (!memcmp(&sock_in6->sin6_addr.in6_u, 288 &sock_in6_e->sin6_addr.in6_u, 289 sizeof(struct in6_addr))) 290 ip_match = true; 291 292 port = ntohs(sock_in6->sin6_port); 293 port_e = ntohs(sock_in6_e->sin6_port); 294 } else { 295 sock_in = (struct sockaddr_in *)sockaddr; 296 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 297 298 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 299 ip_match = true; 300 301 port = ntohs(sock_in->sin_port); 302 port_e = ntohs(sock_in_e->sin_port); 303 } 304 305 if (ip_match && (port_e == port) && 306 (np->np_network_transport == network_transport)) 307 return true; 308 309 return false; 310 } 311 312 /* 313 * Called with mutex np_lock held 314 */ 315 static struct iscsi_np *iscsit_get_np( 316 struct sockaddr_storage *sockaddr, 317 int network_transport) 318 { 319 struct iscsi_np *np; 320 bool match; 321 322 list_for_each_entry(np, &g_np_list, np_list) { 323 spin_lock_bh(&np->np_thread_lock); 324 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 325 spin_unlock_bh(&np->np_thread_lock); 326 continue; 327 } 328 329 match = iscsit_check_np_match(sockaddr, np, network_transport); 330 if (match) { 331 /* 332 * Increment the np_exports reference count now to 333 * prevent iscsit_del_np() below from being called 334 * while iscsi_tpg_add_network_portal() is called. 335 */ 336 np->np_exports++; 337 spin_unlock_bh(&np->np_thread_lock); 338 return np; 339 } 340 spin_unlock_bh(&np->np_thread_lock); 341 } 342 343 return NULL; 344 } 345 346 struct iscsi_np *iscsit_add_np( 347 struct sockaddr_storage *sockaddr, 348 int network_transport) 349 { 350 struct iscsi_np *np; 351 int ret; 352 353 mutex_lock(&np_lock); 354 355 /* 356 * Locate the existing struct iscsi_np if already active.. 357 */ 358 np = iscsit_get_np(sockaddr, network_transport); 359 if (np) { 360 mutex_unlock(&np_lock); 361 return np; 362 } 363 364 np = kzalloc(sizeof(*np), GFP_KERNEL); 365 if (!np) { 366 mutex_unlock(&np_lock); 367 return ERR_PTR(-ENOMEM); 368 } 369 370 np->np_flags |= NPF_IP_NETWORK; 371 np->np_network_transport = network_transport; 372 spin_lock_init(&np->np_thread_lock); 373 init_completion(&np->np_restart_comp); 374 INIT_LIST_HEAD(&np->np_list); 375 376 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0); 377 378 ret = iscsi_target_setup_login_socket(np, sockaddr); 379 if (ret != 0) { 380 kfree(np); 381 mutex_unlock(&np_lock); 382 return ERR_PTR(ret); 383 } 384 385 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 386 if (IS_ERR(np->np_thread)) { 387 pr_err("Unable to create kthread: iscsi_np\n"); 388 ret = PTR_ERR(np->np_thread); 389 kfree(np); 390 mutex_unlock(&np_lock); 391 return ERR_PTR(ret); 392 } 393 /* 394 * Increment the np_exports reference count now to prevent 395 * iscsit_del_np() below from being run while a new call to 396 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 397 * active. We don't need to hold np->np_thread_lock at this 398 * point because iscsi_np has not been added to g_np_list yet. 399 */ 400 np->np_exports = 1; 401 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 402 403 list_add_tail(&np->np_list, &g_np_list); 404 mutex_unlock(&np_lock); 405 406 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 407 &np->np_sockaddr, np->np_transport->name); 408 409 return np; 410 } 411 412 int iscsit_reset_np_thread( 413 struct iscsi_np *np, 414 struct iscsi_tpg_np *tpg_np, 415 struct iscsi_portal_group *tpg, 416 bool shutdown) 417 { 418 spin_lock_bh(&np->np_thread_lock); 419 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 420 spin_unlock_bh(&np->np_thread_lock); 421 return 0; 422 } 423 np->np_thread_state = ISCSI_NP_THREAD_RESET; 424 atomic_inc(&np->np_reset_count); 425 426 if (np->np_thread) { 427 spin_unlock_bh(&np->np_thread_lock); 428 send_sig(SIGINT, np->np_thread, 1); 429 wait_for_completion(&np->np_restart_comp); 430 spin_lock_bh(&np->np_thread_lock); 431 } 432 spin_unlock_bh(&np->np_thread_lock); 433 434 if (tpg_np && shutdown) { 435 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 436 437 wait_for_completion(&tpg_np->tpg_np_comp); 438 } 439 440 return 0; 441 } 442 443 static void iscsit_free_np(struct iscsi_np *np) 444 { 445 if (np->np_socket) 446 sock_release(np->np_socket); 447 } 448 449 int iscsit_del_np(struct iscsi_np *np) 450 { 451 spin_lock_bh(&np->np_thread_lock); 452 np->np_exports--; 453 if (np->np_exports) { 454 np->enabled = true; 455 spin_unlock_bh(&np->np_thread_lock); 456 return 0; 457 } 458 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 459 spin_unlock_bh(&np->np_thread_lock); 460 461 if (np->np_thread) { 462 /* 463 * We need to send the signal to wakeup Linux/Net 464 * which may be sleeping in sock_accept().. 465 */ 466 send_sig(SIGINT, np->np_thread, 1); 467 kthread_stop(np->np_thread); 468 np->np_thread = NULL; 469 } 470 471 np->np_transport->iscsit_free_np(np); 472 473 mutex_lock(&np_lock); 474 list_del(&np->np_list); 475 mutex_unlock(&np_lock); 476 477 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 478 &np->np_sockaddr, np->np_transport->name); 479 480 iscsit_put_transport(np->np_transport); 481 kfree(np); 482 return 0; 483 } 484 485 static void iscsit_get_rx_pdu(struct iscsi_conn *); 486 487 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 488 { 489 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 490 } 491 EXPORT_SYMBOL(iscsit_queue_rsp); 492 493 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 494 { 495 spin_lock_bh(&conn->cmd_lock); 496 if (!list_empty(&cmd->i_conn_node) && 497 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 498 list_del_init(&cmd->i_conn_node); 499 spin_unlock_bh(&conn->cmd_lock); 500 501 __iscsit_free_cmd(cmd, true); 502 } 503 EXPORT_SYMBOL(iscsit_aborted_task); 504 505 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 506 u32, u32, const void *, void *); 507 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 508 509 static int 510 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 511 const void *data_buf, u32 data_buf_len) 512 { 513 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 514 struct kvec *iov; 515 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 516 int ret; 517 518 iov = &cmd->iov_misc[0]; 519 iov[niov].iov_base = cmd->pdu; 520 iov[niov++].iov_len = ISCSI_HDR_LEN; 521 522 if (conn->conn_ops->HeaderDigest) { 523 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 524 525 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 526 ISCSI_HDR_LEN, 0, NULL, 527 header_digest); 528 529 iov[0].iov_len += ISCSI_CRC_LEN; 530 tx_size += ISCSI_CRC_LEN; 531 pr_debug("Attaching CRC32C HeaderDigest" 532 " to opcode 0x%x 0x%08x\n", 533 hdr->opcode, *header_digest); 534 } 535 536 if (data_buf_len) { 537 u32 padding = ((-data_buf_len) & 3); 538 539 iov[niov].iov_base = (void *)data_buf; 540 iov[niov++].iov_len = data_buf_len; 541 tx_size += data_buf_len; 542 543 if (padding != 0) { 544 iov[niov].iov_base = &cmd->pad_bytes; 545 iov[niov++].iov_len = padding; 546 tx_size += padding; 547 pr_debug("Attaching %u additional" 548 " padding bytes.\n", padding); 549 } 550 551 if (conn->conn_ops->DataDigest) { 552 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 553 data_buf, data_buf_len, 554 padding, &cmd->pad_bytes, 555 &cmd->data_crc); 556 557 iov[niov].iov_base = &cmd->data_crc; 558 iov[niov++].iov_len = ISCSI_CRC_LEN; 559 tx_size += ISCSI_CRC_LEN; 560 pr_debug("Attached DataDigest for %u" 561 " bytes opcode 0x%x, CRC 0x%08x\n", 562 data_buf_len, hdr->opcode, cmd->data_crc); 563 } 564 } 565 566 cmd->iov_misc_count = niov; 567 cmd->tx_size = tx_size; 568 569 ret = iscsit_send_tx_data(cmd, conn, 1); 570 if (ret < 0) { 571 iscsit_tx_thread_wait_for_tcp(conn); 572 return ret; 573 } 574 575 return 0; 576 } 577 578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 579 static void iscsit_unmap_iovec(struct iscsi_cmd *); 580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 581 u32, u32, u32, u8 *); 582 static int 583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 584 const struct iscsi_datain *datain) 585 { 586 struct kvec *iov; 587 u32 iov_count = 0, tx_size = 0; 588 int ret, iov_ret; 589 590 iov = &cmd->iov_data[0]; 591 iov[iov_count].iov_base = cmd->pdu; 592 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 593 tx_size += ISCSI_HDR_LEN; 594 595 if (conn->conn_ops->HeaderDigest) { 596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 597 598 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 599 ISCSI_HDR_LEN, 0, NULL, 600 header_digest); 601 602 iov[0].iov_len += ISCSI_CRC_LEN; 603 tx_size += ISCSI_CRC_LEN; 604 605 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 606 *header_digest); 607 } 608 609 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 610 datain->offset, datain->length); 611 if (iov_ret < 0) 612 return -1; 613 614 iov_count += iov_ret; 615 tx_size += datain->length; 616 617 cmd->padding = ((-datain->length) & 3); 618 if (cmd->padding) { 619 iov[iov_count].iov_base = cmd->pad_bytes; 620 iov[iov_count++].iov_len = cmd->padding; 621 tx_size += cmd->padding; 622 623 pr_debug("Attaching %u padding bytes\n", cmd->padding); 624 } 625 626 if (conn->conn_ops->DataDigest) { 627 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 628 cmd, datain->offset, 629 datain->length, 630 cmd->padding, 631 cmd->pad_bytes); 632 633 iov[iov_count].iov_base = &cmd->data_crc; 634 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 635 tx_size += ISCSI_CRC_LEN; 636 637 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 638 datain->length + cmd->padding, cmd->data_crc); 639 } 640 641 cmd->iov_data_count = iov_count; 642 cmd->tx_size = tx_size; 643 644 ret = iscsit_fe_sendpage_sg(cmd, conn); 645 646 iscsit_unmap_iovec(cmd); 647 648 if (ret < 0) { 649 iscsit_tx_thread_wait_for_tcp(conn); 650 return ret; 651 } 652 653 return 0; 654 } 655 656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 657 struct iscsi_datain_req *dr, const void *buf, 658 u32 buf_len) 659 { 660 if (dr) 661 return iscsit_xmit_datain_pdu(conn, cmd, buf); 662 else 663 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 664 } 665 666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 667 { 668 return TARGET_PROT_NORMAL; 669 } 670 671 static struct iscsit_transport iscsi_target_transport = { 672 .name = "iSCSI/TCP", 673 .transport_type = ISCSI_TCP, 674 .rdma_shutdown = false, 675 .owner = NULL, 676 .iscsit_setup_np = iscsit_setup_np, 677 .iscsit_accept_np = iscsit_accept_np, 678 .iscsit_free_np = iscsit_free_np, 679 .iscsit_get_login_rx = iscsit_get_login_rx, 680 .iscsit_put_login_tx = iscsit_put_login_tx, 681 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 682 .iscsit_immediate_queue = iscsit_immediate_queue, 683 .iscsit_response_queue = iscsit_response_queue, 684 .iscsit_queue_data_in = iscsit_queue_rsp, 685 .iscsit_queue_status = iscsit_queue_rsp, 686 .iscsit_aborted_task = iscsit_aborted_task, 687 .iscsit_xmit_pdu = iscsit_xmit_pdu, 688 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 689 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 690 }; 691 692 static int __init iscsi_target_init_module(void) 693 { 694 int ret = 0, size; 695 696 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 697 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 698 if (!iscsit_global) 699 return -1; 700 701 spin_lock_init(&iscsit_global->ts_bitmap_lock); 702 mutex_init(&auth_id_lock); 703 spin_lock_init(&sess_idr_lock); 704 idr_init(&tiqn_idr); 705 idr_init(&sess_idr); 706 707 ret = target_register_template(&iscsi_ops); 708 if (ret) 709 goto out; 710 711 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 712 iscsit_global->ts_bitmap = vzalloc(size); 713 if (!iscsit_global->ts_bitmap) 714 goto configfs_out; 715 716 lio_qr_cache = kmem_cache_create("lio_qr_cache", 717 sizeof(struct iscsi_queue_req), 718 __alignof__(struct iscsi_queue_req), 0, NULL); 719 if (!lio_qr_cache) { 720 pr_err("nable to kmem_cache_create() for" 721 " lio_qr_cache\n"); 722 goto bitmap_out; 723 } 724 725 lio_dr_cache = kmem_cache_create("lio_dr_cache", 726 sizeof(struct iscsi_datain_req), 727 __alignof__(struct iscsi_datain_req), 0, NULL); 728 if (!lio_dr_cache) { 729 pr_err("Unable to kmem_cache_create() for" 730 " lio_dr_cache\n"); 731 goto qr_out; 732 } 733 734 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 735 sizeof(struct iscsi_ooo_cmdsn), 736 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 737 if (!lio_ooo_cache) { 738 pr_err("Unable to kmem_cache_create() for" 739 " lio_ooo_cache\n"); 740 goto dr_out; 741 } 742 743 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 744 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 745 0, NULL); 746 if (!lio_r2t_cache) { 747 pr_err("Unable to kmem_cache_create() for" 748 " lio_r2t_cache\n"); 749 goto ooo_out; 750 } 751 752 iscsit_register_transport(&iscsi_target_transport); 753 754 if (iscsit_load_discovery_tpg() < 0) 755 goto r2t_out; 756 757 return ret; 758 r2t_out: 759 iscsit_unregister_transport(&iscsi_target_transport); 760 kmem_cache_destroy(lio_r2t_cache); 761 ooo_out: 762 kmem_cache_destroy(lio_ooo_cache); 763 dr_out: 764 kmem_cache_destroy(lio_dr_cache); 765 qr_out: 766 kmem_cache_destroy(lio_qr_cache); 767 bitmap_out: 768 vfree(iscsit_global->ts_bitmap); 769 configfs_out: 770 /* XXX: this probably wants it to be it's own unwind step.. */ 771 if (iscsit_global->discovery_tpg) 772 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 773 target_unregister_template(&iscsi_ops); 774 out: 775 kfree(iscsit_global); 776 return -ENOMEM; 777 } 778 779 static void __exit iscsi_target_cleanup_module(void) 780 { 781 iscsit_release_discovery_tpg(); 782 iscsit_unregister_transport(&iscsi_target_transport); 783 kmem_cache_destroy(lio_qr_cache); 784 kmem_cache_destroy(lio_dr_cache); 785 kmem_cache_destroy(lio_ooo_cache); 786 kmem_cache_destroy(lio_r2t_cache); 787 788 /* 789 * Shutdown discovery sessions and disable discovery TPG 790 */ 791 if (iscsit_global->discovery_tpg) 792 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 793 794 target_unregister_template(&iscsi_ops); 795 796 vfree(iscsit_global->ts_bitmap); 797 kfree(iscsit_global); 798 } 799 800 int iscsit_add_reject( 801 struct iscsi_conn *conn, 802 u8 reason, 803 unsigned char *buf) 804 { 805 struct iscsi_cmd *cmd; 806 807 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 808 if (!cmd) 809 return -1; 810 811 cmd->iscsi_opcode = ISCSI_OP_REJECT; 812 cmd->reject_reason = reason; 813 814 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 815 if (!cmd->buf_ptr) { 816 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 817 iscsit_free_cmd(cmd, false); 818 return -1; 819 } 820 821 spin_lock_bh(&conn->cmd_lock); 822 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 823 spin_unlock_bh(&conn->cmd_lock); 824 825 cmd->i_state = ISTATE_SEND_REJECT; 826 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 827 828 return -1; 829 } 830 EXPORT_SYMBOL(iscsit_add_reject); 831 832 static int iscsit_add_reject_from_cmd( 833 struct iscsi_cmd *cmd, 834 u8 reason, 835 bool add_to_conn, 836 unsigned char *buf) 837 { 838 struct iscsi_conn *conn; 839 const bool do_put = cmd->se_cmd.se_tfo != NULL; 840 841 if (!cmd->conn) { 842 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 843 cmd->init_task_tag); 844 return -1; 845 } 846 conn = cmd->conn; 847 848 cmd->iscsi_opcode = ISCSI_OP_REJECT; 849 cmd->reject_reason = reason; 850 851 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 852 if (!cmd->buf_ptr) { 853 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 854 iscsit_free_cmd(cmd, false); 855 return -1; 856 } 857 858 if (add_to_conn) { 859 spin_lock_bh(&conn->cmd_lock); 860 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 861 spin_unlock_bh(&conn->cmd_lock); 862 } 863 864 cmd->i_state = ISTATE_SEND_REJECT; 865 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 866 /* 867 * Perform the kref_put now if se_cmd has already been setup by 868 * scsit_setup_scsi_cmd() 869 */ 870 if (do_put) { 871 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 872 target_put_sess_cmd(&cmd->se_cmd); 873 } 874 return -1; 875 } 876 877 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 878 unsigned char *buf) 879 { 880 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 881 } 882 883 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 884 { 885 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 886 } 887 EXPORT_SYMBOL(iscsit_reject_cmd); 888 889 /* 890 * Map some portion of the allocated scatterlist to an iovec, suitable for 891 * kernel sockets to copy data in/out. 892 */ 893 static int iscsit_map_iovec( 894 struct iscsi_cmd *cmd, 895 struct kvec *iov, 896 u32 data_offset, 897 u32 data_length) 898 { 899 u32 i = 0; 900 struct scatterlist *sg; 901 unsigned int page_off; 902 903 /* 904 * We know each entry in t_data_sg contains a page. 905 */ 906 u32 ent = data_offset / PAGE_SIZE; 907 908 if (ent >= cmd->se_cmd.t_data_nents) { 909 pr_err("Initial page entry out-of-bounds\n"); 910 return -1; 911 } 912 913 sg = &cmd->se_cmd.t_data_sg[ent]; 914 page_off = (data_offset % PAGE_SIZE); 915 916 cmd->first_data_sg = sg; 917 cmd->first_data_sg_off = page_off; 918 919 while (data_length) { 920 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 921 922 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 923 iov[i].iov_len = cur_len; 924 925 data_length -= cur_len; 926 page_off = 0; 927 sg = sg_next(sg); 928 i++; 929 } 930 931 cmd->kmapped_nents = i; 932 933 return i; 934 } 935 936 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 937 { 938 u32 i; 939 struct scatterlist *sg; 940 941 sg = cmd->first_data_sg; 942 943 for (i = 0; i < cmd->kmapped_nents; i++) 944 kunmap(sg_page(&sg[i])); 945 } 946 947 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 948 { 949 LIST_HEAD(ack_list); 950 struct iscsi_cmd *cmd, *cmd_p; 951 952 conn->exp_statsn = exp_statsn; 953 954 if (conn->sess->sess_ops->RDMAExtensions) 955 return; 956 957 spin_lock_bh(&conn->cmd_lock); 958 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 959 spin_lock(&cmd->istate_lock); 960 if ((cmd->i_state == ISTATE_SENT_STATUS) && 961 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 962 cmd->i_state = ISTATE_REMOVE; 963 spin_unlock(&cmd->istate_lock); 964 list_move_tail(&cmd->i_conn_node, &ack_list); 965 continue; 966 } 967 spin_unlock(&cmd->istate_lock); 968 } 969 spin_unlock_bh(&conn->cmd_lock); 970 971 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 972 list_del_init(&cmd->i_conn_node); 973 iscsit_free_cmd(cmd, false); 974 } 975 } 976 977 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 978 { 979 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 980 981 iov_count += ISCSI_IOV_DATA_BUFFER; 982 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 983 if (!cmd->iov_data) 984 return -ENOMEM; 985 986 cmd->orig_iov_data_count = iov_count; 987 return 0; 988 } 989 990 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 991 unsigned char *buf) 992 { 993 int data_direction, payload_length; 994 struct iscsi_scsi_req *hdr; 995 int iscsi_task_attr; 996 int sam_task_attr; 997 998 atomic_long_inc(&conn->sess->cmd_pdus); 999 1000 hdr = (struct iscsi_scsi_req *) buf; 1001 payload_length = ntoh24(hdr->dlength); 1002 1003 /* FIXME; Add checks for AdditionalHeaderSegment */ 1004 1005 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1006 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1007 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1008 " not set. Bad iSCSI Initiator.\n"); 1009 return iscsit_add_reject_cmd(cmd, 1010 ISCSI_REASON_BOOKMARK_INVALID, buf); 1011 } 1012 1013 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1014 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1015 /* 1016 * From RFC-3720 Section 10.3.1: 1017 * 1018 * "Either or both of R and W MAY be 1 when either the 1019 * Expected Data Transfer Length and/or Bidirectional Read 1020 * Expected Data Transfer Length are 0" 1021 * 1022 * For this case, go ahead and clear the unnecssary bits 1023 * to avoid any confusion with ->data_direction. 1024 */ 1025 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1026 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1027 1028 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1029 " set when Expected Data Transfer Length is 0 for" 1030 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1031 } 1032 1033 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1034 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1035 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1036 " MUST be set if Expected Data Transfer Length is not 0." 1037 " Bad iSCSI Initiator\n"); 1038 return iscsit_add_reject_cmd(cmd, 1039 ISCSI_REASON_BOOKMARK_INVALID, buf); 1040 } 1041 1042 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1043 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1044 pr_err("Bidirectional operations not supported!\n"); 1045 return iscsit_add_reject_cmd(cmd, 1046 ISCSI_REASON_BOOKMARK_INVALID, buf); 1047 } 1048 1049 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1050 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1051 " Scsi Command PDU.\n"); 1052 return iscsit_add_reject_cmd(cmd, 1053 ISCSI_REASON_BOOKMARK_INVALID, buf); 1054 } 1055 1056 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1057 pr_err("ImmediateData=No but DataSegmentLength=%u," 1058 " protocol error.\n", payload_length); 1059 return iscsit_add_reject_cmd(cmd, 1060 ISCSI_REASON_PROTOCOL_ERROR, buf); 1061 } 1062 1063 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1064 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1065 pr_err("Expected Data Transfer Length and Length of" 1066 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1067 " bit is not set protocol error\n"); 1068 return iscsit_add_reject_cmd(cmd, 1069 ISCSI_REASON_PROTOCOL_ERROR, buf); 1070 } 1071 1072 if (payload_length > be32_to_cpu(hdr->data_length)) { 1073 pr_err("DataSegmentLength: %u is greater than" 1074 " EDTL: %u, protocol error.\n", payload_length, 1075 hdr->data_length); 1076 return iscsit_add_reject_cmd(cmd, 1077 ISCSI_REASON_PROTOCOL_ERROR, buf); 1078 } 1079 1080 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1081 pr_err("DataSegmentLength: %u is greater than" 1082 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1083 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1084 return iscsit_add_reject_cmd(cmd, 1085 ISCSI_REASON_PROTOCOL_ERROR, buf); 1086 } 1087 1088 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1089 pr_err("DataSegmentLength: %u is greater than" 1090 " FirstBurstLength: %u, protocol error.\n", 1091 payload_length, conn->sess->sess_ops->FirstBurstLength); 1092 return iscsit_add_reject_cmd(cmd, 1093 ISCSI_REASON_BOOKMARK_INVALID, buf); 1094 } 1095 1096 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1097 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1098 DMA_NONE; 1099 1100 cmd->data_direction = data_direction; 1101 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1102 /* 1103 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1104 */ 1105 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1106 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1107 sam_task_attr = TCM_SIMPLE_TAG; 1108 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1109 sam_task_attr = TCM_ORDERED_TAG; 1110 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1111 sam_task_attr = TCM_HEAD_TAG; 1112 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1113 sam_task_attr = TCM_ACA_TAG; 1114 else { 1115 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1116 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1117 sam_task_attr = TCM_SIMPLE_TAG; 1118 } 1119 1120 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1121 cmd->i_state = ISTATE_NEW_CMD; 1122 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1123 cmd->immediate_data = (payload_length) ? 1 : 0; 1124 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1125 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1126 if (cmd->unsolicited_data) 1127 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1128 1129 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1130 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1131 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1132 else 1133 cmd->targ_xfer_tag = 0xFFFFFFFF; 1134 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1135 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1136 cmd->first_burst_len = payload_length; 1137 1138 if (!conn->sess->sess_ops->RDMAExtensions && 1139 cmd->data_direction == DMA_FROM_DEVICE) { 1140 struct iscsi_datain_req *dr; 1141 1142 dr = iscsit_allocate_datain_req(); 1143 if (!dr) 1144 return iscsit_add_reject_cmd(cmd, 1145 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1146 1147 iscsit_attach_datain_req(cmd, dr); 1148 } 1149 1150 /* 1151 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1152 */ 1153 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1154 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1155 cmd->data_direction, sam_task_attr, 1156 cmd->sense_buffer + 2); 1157 1158 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1159 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1160 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1161 conn->cid); 1162 1163 target_get_sess_cmd(&cmd->se_cmd, true); 1164 1165 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1166 scsilun_to_int(&hdr->lun)); 1167 if (cmd->sense_reason) 1168 goto attach_cmd; 1169 1170 /* only used for printks or comparing with ->ref_task_tag */ 1171 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1172 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1173 if (cmd->sense_reason) { 1174 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1175 return iscsit_add_reject_cmd(cmd, 1176 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1177 } 1178 1179 goto attach_cmd; 1180 } 1181 1182 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1183 return iscsit_add_reject_cmd(cmd, 1184 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1185 } 1186 1187 attach_cmd: 1188 spin_lock_bh(&conn->cmd_lock); 1189 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1190 spin_unlock_bh(&conn->cmd_lock); 1191 /* 1192 * Check if we need to delay processing because of ALUA 1193 * Active/NonOptimized primary access state.. 1194 */ 1195 core_alua_check_nonop_delay(&cmd->se_cmd); 1196 1197 return 0; 1198 } 1199 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1200 1201 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1202 { 1203 iscsit_set_dataout_sequence_values(cmd); 1204 1205 spin_lock_bh(&cmd->dataout_timeout_lock); 1206 iscsit_start_dataout_timer(cmd, cmd->conn); 1207 spin_unlock_bh(&cmd->dataout_timeout_lock); 1208 } 1209 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1210 1211 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1212 struct iscsi_scsi_req *hdr) 1213 { 1214 int cmdsn_ret = 0; 1215 /* 1216 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1217 * the Immediate Bit is not set, and no Immediate 1218 * Data is attached. 1219 * 1220 * A PDU/CmdSN carrying Immediate Data can only 1221 * be processed after the DataCRC has passed. 1222 * If the DataCRC fails, the CmdSN MUST NOT 1223 * be acknowledged. (See below) 1224 */ 1225 if (!cmd->immediate_data) { 1226 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1227 (unsigned char *)hdr, hdr->cmdsn); 1228 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1229 return -1; 1230 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1231 target_put_sess_cmd(&cmd->se_cmd); 1232 return 0; 1233 } 1234 } 1235 1236 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1237 1238 /* 1239 * If no Immediate Data is attached, it's OK to return now. 1240 */ 1241 if (!cmd->immediate_data) { 1242 if (!cmd->sense_reason && cmd->unsolicited_data) 1243 iscsit_set_unsoliticed_dataout(cmd); 1244 if (!cmd->sense_reason) 1245 return 0; 1246 1247 target_put_sess_cmd(&cmd->se_cmd); 1248 return 0; 1249 } 1250 1251 /* 1252 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1253 * execution. These exceptions are processed in CmdSN order using 1254 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1255 */ 1256 if (cmd->sense_reason) 1257 return 1; 1258 /* 1259 * Call directly into transport_generic_new_cmd() to perform 1260 * the backend memory allocation. 1261 */ 1262 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1263 if (cmd->sense_reason) 1264 return 1; 1265 1266 return 0; 1267 } 1268 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1269 1270 static int 1271 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1272 bool dump_payload) 1273 { 1274 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1275 /* 1276 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1277 */ 1278 if (dump_payload) 1279 goto after_immediate_data; 1280 /* 1281 * Check for underflow case where both EDTL and immediate data payload 1282 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has 1283 * already been set in target_cmd_size_check() as se_cmd->data_length. 1284 * 1285 * For this special case, fail the command and dump the immediate data 1286 * payload. 1287 */ 1288 if (cmd->first_burst_len > cmd->se_cmd.data_length) { 1289 cmd->sense_reason = TCM_INVALID_CDB_FIELD; 1290 goto after_immediate_data; 1291 } 1292 1293 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1294 cmd->first_burst_len); 1295 after_immediate_data: 1296 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1297 /* 1298 * A PDU/CmdSN carrying Immediate Data passed 1299 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1300 * Immediate Bit is not set. 1301 */ 1302 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1303 (unsigned char *)hdr, hdr->cmdsn); 1304 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1305 return -1; 1306 1307 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1308 int rc; 1309 1310 rc = iscsit_dump_data_payload(cmd->conn, 1311 cmd->first_burst_len, 1); 1312 target_put_sess_cmd(&cmd->se_cmd); 1313 return rc; 1314 } else if (cmd->unsolicited_data) 1315 iscsit_set_unsoliticed_dataout(cmd); 1316 1317 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1318 /* 1319 * Immediate Data failed DataCRC and ERL>=1, 1320 * silently drop this PDU and let the initiator 1321 * plug the CmdSN gap. 1322 * 1323 * FIXME: Send Unsolicited NOPIN with reserved 1324 * TTT here to help the initiator figure out 1325 * the missing CmdSN, although they should be 1326 * intelligent enough to determine the missing 1327 * CmdSN and issue a retry to plug the sequence. 1328 */ 1329 cmd->i_state = ISTATE_REMOVE; 1330 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1331 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1332 return -1; 1333 1334 return 0; 1335 } 1336 1337 static int 1338 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1339 unsigned char *buf) 1340 { 1341 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1342 int rc, immed_data; 1343 bool dump_payload = false; 1344 1345 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1346 if (rc < 0) 1347 return 0; 1348 /* 1349 * Allocation iovecs needed for struct socket operations for 1350 * traditional iSCSI block I/O. 1351 */ 1352 if (iscsit_allocate_iovecs(cmd) < 0) { 1353 return iscsit_reject_cmd(cmd, 1354 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1355 } 1356 immed_data = cmd->immediate_data; 1357 1358 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1359 if (rc < 0) 1360 return rc; 1361 else if (rc > 0) 1362 dump_payload = true; 1363 1364 if (!immed_data) 1365 return 0; 1366 1367 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1368 } 1369 1370 static u32 iscsit_do_crypto_hash_sg( 1371 struct ahash_request *hash, 1372 struct iscsi_cmd *cmd, 1373 u32 data_offset, 1374 u32 data_length, 1375 u32 padding, 1376 u8 *pad_bytes) 1377 { 1378 u32 data_crc; 1379 struct scatterlist *sg; 1380 unsigned int page_off; 1381 1382 crypto_ahash_init(hash); 1383 1384 sg = cmd->first_data_sg; 1385 page_off = cmd->first_data_sg_off; 1386 1387 while (data_length) { 1388 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1389 1390 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1391 crypto_ahash_update(hash); 1392 1393 data_length -= cur_len; 1394 page_off = 0; 1395 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1396 sg = sg_next(sg); 1397 } 1398 1399 if (padding) { 1400 struct scatterlist pad_sg; 1401 1402 sg_init_one(&pad_sg, pad_bytes, padding); 1403 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1404 padding); 1405 crypto_ahash_finup(hash); 1406 } else { 1407 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1408 crypto_ahash_final(hash); 1409 } 1410 1411 return data_crc; 1412 } 1413 1414 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1415 const void *buf, u32 payload_length, u32 padding, 1416 const void *pad_bytes, void *data_crc) 1417 { 1418 struct scatterlist sg[2]; 1419 1420 sg_init_table(sg, ARRAY_SIZE(sg)); 1421 sg_set_buf(sg, buf, payload_length); 1422 sg_set_buf(sg + 1, pad_bytes, padding); 1423 1424 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1425 1426 crypto_ahash_digest(hash); 1427 } 1428 1429 int 1430 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1431 struct iscsi_cmd *cmd, u32 payload_length, 1432 bool *success) 1433 { 1434 struct iscsi_data *hdr = buf; 1435 struct se_cmd *se_cmd; 1436 int rc; 1437 1438 /* iSCSI write */ 1439 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1440 1441 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1442 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1443 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1444 payload_length, conn->cid); 1445 1446 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1447 pr_err("Command ITT: 0x%08x received DataOUT after" 1448 " last DataOUT received, dumping payload\n", 1449 cmd->init_task_tag); 1450 return iscsit_dump_data_payload(conn, payload_length, 1); 1451 } 1452 1453 if (cmd->data_direction != DMA_TO_DEVICE) { 1454 pr_err("Command ITT: 0x%08x received DataOUT for a" 1455 " NON-WRITE command.\n", cmd->init_task_tag); 1456 return iscsit_dump_data_payload(conn, payload_length, 1); 1457 } 1458 se_cmd = &cmd->se_cmd; 1459 iscsit_mod_dataout_timer(cmd); 1460 1461 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1462 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1463 be32_to_cpu(hdr->offset), payload_length, 1464 cmd->se_cmd.data_length); 1465 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1466 } 1467 1468 if (cmd->unsolicited_data) { 1469 int dump_unsolicited_data = 0; 1470 1471 if (conn->sess->sess_ops->InitialR2T) { 1472 pr_err("Received unexpected unsolicited data" 1473 " while InitialR2T=Yes, protocol error.\n"); 1474 transport_send_check_condition_and_sense(&cmd->se_cmd, 1475 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1476 return -1; 1477 } 1478 /* 1479 * Special case for dealing with Unsolicited DataOUT 1480 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1481 * failures; 1482 */ 1483 1484 /* Something's amiss if we're not in WRITE_PENDING state... */ 1485 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1486 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1487 dump_unsolicited_data = 1; 1488 1489 if (dump_unsolicited_data) { 1490 /* 1491 * Check if a delayed TASK_ABORTED status needs to 1492 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1493 * received with the unsolicited data out. 1494 */ 1495 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1496 iscsit_stop_dataout_timer(cmd); 1497 1498 transport_check_aborted_status(se_cmd, 1499 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1500 return iscsit_dump_data_payload(conn, payload_length, 1); 1501 } 1502 } else { 1503 /* 1504 * For the normal solicited data path: 1505 * 1506 * Check for a delayed TASK_ABORTED status and dump any 1507 * incoming data out payload if one exists. Also, when the 1508 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1509 * data out sequence, we decrement outstanding_r2ts. Once 1510 * outstanding_r2ts reaches zero, go ahead and send the delayed 1511 * TASK_ABORTED status. 1512 */ 1513 if (se_cmd->transport_state & CMD_T_ABORTED) { 1514 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1515 if (--cmd->outstanding_r2ts < 1) { 1516 iscsit_stop_dataout_timer(cmd); 1517 transport_check_aborted_status( 1518 se_cmd, 1); 1519 } 1520 1521 return iscsit_dump_data_payload(conn, payload_length, 1); 1522 } 1523 } 1524 /* 1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1526 * within-command recovery checks before receiving the payload. 1527 */ 1528 rc = iscsit_check_pre_dataout(cmd, buf); 1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1530 return 0; 1531 else if (rc == DATAOUT_CANNOT_RECOVER) 1532 return -1; 1533 *success = true; 1534 return 0; 1535 } 1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1537 1538 int 1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1540 struct iscsi_cmd **out_cmd) 1541 { 1542 struct iscsi_data *hdr = buf; 1543 struct iscsi_cmd *cmd; 1544 u32 payload_length = ntoh24(hdr->dlength); 1545 int rc; 1546 bool success = false; 1547 1548 if (!payload_length) { 1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1550 return 0; 1551 } 1552 1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1554 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1555 " MaxXmitDataSegmentLength: %u\n", payload_length, 1556 conn->conn_ops->MaxXmitDataSegmentLength); 1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1558 } 1559 1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1561 if (!cmd) 1562 return 0; 1563 1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1565 1566 if (success) 1567 *out_cmd = cmd; 1568 1569 return rc; 1570 } 1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1572 1573 static int 1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1575 struct iscsi_data *hdr) 1576 { 1577 struct kvec *iov; 1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1579 u32 payload_length = ntoh24(hdr->dlength); 1580 int iov_ret, data_crc_failed = 0; 1581 1582 rx_size += payload_length; 1583 iov = &cmd->iov_data[0]; 1584 1585 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1586 payload_length); 1587 if (iov_ret < 0) 1588 return -1; 1589 1590 iov_count += iov_ret; 1591 1592 padding = ((-payload_length) & 3); 1593 if (padding != 0) { 1594 iov[iov_count].iov_base = cmd->pad_bytes; 1595 iov[iov_count++].iov_len = padding; 1596 rx_size += padding; 1597 pr_debug("Receiving %u padding bytes.\n", padding); 1598 } 1599 1600 if (conn->conn_ops->DataDigest) { 1601 iov[iov_count].iov_base = &checksum; 1602 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1603 rx_size += ISCSI_CRC_LEN; 1604 } 1605 1606 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1607 1608 iscsit_unmap_iovec(cmd); 1609 1610 if (rx_got != rx_size) 1611 return -1; 1612 1613 if (conn->conn_ops->DataDigest) { 1614 u32 data_crc; 1615 1616 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1617 be32_to_cpu(hdr->offset), 1618 payload_length, padding, 1619 cmd->pad_bytes); 1620 1621 if (checksum != data_crc) { 1622 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1623 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1624 " does not match computed 0x%08x\n", 1625 hdr->itt, hdr->offset, payload_length, 1626 hdr->datasn, checksum, data_crc); 1627 data_crc_failed = 1; 1628 } else { 1629 pr_debug("Got CRC32C DataDigest 0x%08x for" 1630 " %u bytes of Data Out\n", checksum, 1631 payload_length); 1632 } 1633 } 1634 1635 return data_crc_failed; 1636 } 1637 1638 int 1639 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1640 bool data_crc_failed) 1641 { 1642 struct iscsi_conn *conn = cmd->conn; 1643 int rc, ooo_cmdsn; 1644 /* 1645 * Increment post receive data and CRC values or perform 1646 * within-command recovery. 1647 */ 1648 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1649 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1650 return 0; 1651 else if (rc == DATAOUT_SEND_R2T) { 1652 iscsit_set_dataout_sequence_values(cmd); 1653 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1654 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1655 /* 1656 * Handle extra special case for out of order 1657 * Unsolicited Data Out. 1658 */ 1659 spin_lock_bh(&cmd->istate_lock); 1660 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1661 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1662 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1663 spin_unlock_bh(&cmd->istate_lock); 1664 1665 iscsit_stop_dataout_timer(cmd); 1666 if (ooo_cmdsn) 1667 return 0; 1668 target_execute_cmd(&cmd->se_cmd); 1669 return 0; 1670 } else /* DATAOUT_CANNOT_RECOVER */ 1671 return -1; 1672 1673 return 0; 1674 } 1675 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1676 1677 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1678 { 1679 struct iscsi_cmd *cmd = NULL; 1680 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1681 int rc; 1682 bool data_crc_failed = false; 1683 1684 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1685 if (rc < 0) 1686 return 0; 1687 else if (!cmd) 1688 return 0; 1689 1690 rc = iscsit_get_dataout(conn, cmd, hdr); 1691 if (rc < 0) 1692 return rc; 1693 else if (rc > 0) 1694 data_crc_failed = true; 1695 1696 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1697 } 1698 1699 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1700 struct iscsi_nopout *hdr) 1701 { 1702 u32 payload_length = ntoh24(hdr->dlength); 1703 1704 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1705 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1706 if (!cmd) 1707 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1708 (unsigned char *)hdr); 1709 1710 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1711 (unsigned char *)hdr); 1712 } 1713 1714 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1715 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1716 " not set, protocol error.\n"); 1717 if (!cmd) 1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1719 (unsigned char *)hdr); 1720 1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1722 (unsigned char *)hdr); 1723 } 1724 1725 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1726 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1727 " greater than MaxXmitDataSegmentLength: %u, protocol" 1728 " error.\n", payload_length, 1729 conn->conn_ops->MaxXmitDataSegmentLength); 1730 if (!cmd) 1731 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1732 (unsigned char *)hdr); 1733 1734 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1735 (unsigned char *)hdr); 1736 } 1737 1738 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1739 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1740 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1741 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1742 payload_length); 1743 /* 1744 * This is not a response to a Unsolicited NopIN, which means 1745 * it can either be a NOPOUT ping request (with a valid ITT), 1746 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1747 * Either way, make sure we allocate an struct iscsi_cmd, as both 1748 * can contain ping data. 1749 */ 1750 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1751 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1752 cmd->i_state = ISTATE_SEND_NOPIN; 1753 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1754 1 : 0); 1755 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1756 cmd->targ_xfer_tag = 0xFFFFFFFF; 1757 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1758 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1759 cmd->data_direction = DMA_NONE; 1760 } 1761 1762 return 0; 1763 } 1764 EXPORT_SYMBOL(iscsit_setup_nop_out); 1765 1766 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1767 struct iscsi_nopout *hdr) 1768 { 1769 struct iscsi_cmd *cmd_p = NULL; 1770 int cmdsn_ret = 0; 1771 /* 1772 * Initiator is expecting a NopIN ping reply.. 1773 */ 1774 if (hdr->itt != RESERVED_ITT) { 1775 if (!cmd) 1776 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1777 (unsigned char *)hdr); 1778 1779 spin_lock_bh(&conn->cmd_lock); 1780 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1781 spin_unlock_bh(&conn->cmd_lock); 1782 1783 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1784 1785 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1786 iscsit_add_cmd_to_response_queue(cmd, conn, 1787 cmd->i_state); 1788 return 0; 1789 } 1790 1791 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1792 (unsigned char *)hdr, hdr->cmdsn); 1793 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1794 return 0; 1795 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1796 return -1; 1797 1798 return 0; 1799 } 1800 /* 1801 * This was a response to a unsolicited NOPIN ping. 1802 */ 1803 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1804 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1805 if (!cmd_p) 1806 return -EINVAL; 1807 1808 iscsit_stop_nopin_response_timer(conn); 1809 1810 cmd_p->i_state = ISTATE_REMOVE; 1811 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1812 1813 iscsit_start_nopin_timer(conn); 1814 return 0; 1815 } 1816 /* 1817 * Otherwise, initiator is not expecting a NOPIN is response. 1818 * Just ignore for now. 1819 */ 1820 1821 if (cmd) 1822 iscsit_free_cmd(cmd, false); 1823 1824 return 0; 1825 } 1826 EXPORT_SYMBOL(iscsit_process_nop_out); 1827 1828 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1829 unsigned char *buf) 1830 { 1831 unsigned char *ping_data = NULL; 1832 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1833 struct kvec *iov = NULL; 1834 u32 payload_length = ntoh24(hdr->dlength); 1835 int ret; 1836 1837 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1838 if (ret < 0) 1839 return 0; 1840 /* 1841 * Handle NOP-OUT payload for traditional iSCSI sockets 1842 */ 1843 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1844 u32 checksum, data_crc, padding = 0; 1845 int niov = 0, rx_got, rx_size = payload_length; 1846 1847 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1848 if (!ping_data) { 1849 ret = -1; 1850 goto out; 1851 } 1852 1853 iov = &cmd->iov_misc[0]; 1854 iov[niov].iov_base = ping_data; 1855 iov[niov++].iov_len = payload_length; 1856 1857 padding = ((-payload_length) & 3); 1858 if (padding != 0) { 1859 pr_debug("Receiving %u additional bytes" 1860 " for padding.\n", padding); 1861 iov[niov].iov_base = &cmd->pad_bytes; 1862 iov[niov++].iov_len = padding; 1863 rx_size += padding; 1864 } 1865 if (conn->conn_ops->DataDigest) { 1866 iov[niov].iov_base = &checksum; 1867 iov[niov++].iov_len = ISCSI_CRC_LEN; 1868 rx_size += ISCSI_CRC_LEN; 1869 } 1870 1871 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1872 if (rx_got != rx_size) { 1873 ret = -1; 1874 goto out; 1875 } 1876 1877 if (conn->conn_ops->DataDigest) { 1878 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1879 payload_length, padding, 1880 cmd->pad_bytes, &data_crc); 1881 1882 if (checksum != data_crc) { 1883 pr_err("Ping data CRC32C DataDigest" 1884 " 0x%08x does not match computed 0x%08x\n", 1885 checksum, data_crc); 1886 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1887 pr_err("Unable to recover from" 1888 " NOPOUT Ping DataCRC failure while in" 1889 " ERL=0.\n"); 1890 ret = -1; 1891 goto out; 1892 } else { 1893 /* 1894 * Silently drop this PDU and let the 1895 * initiator plug the CmdSN gap. 1896 */ 1897 pr_debug("Dropping NOPOUT" 1898 " Command CmdSN: 0x%08x due to" 1899 " DataCRC error.\n", hdr->cmdsn); 1900 ret = 0; 1901 goto out; 1902 } 1903 } else { 1904 pr_debug("Got CRC32C DataDigest" 1905 " 0x%08x for %u bytes of ping data.\n", 1906 checksum, payload_length); 1907 } 1908 } 1909 1910 ping_data[payload_length] = '\0'; 1911 /* 1912 * Attach ping data to struct iscsi_cmd->buf_ptr. 1913 */ 1914 cmd->buf_ptr = ping_data; 1915 cmd->buf_ptr_size = payload_length; 1916 1917 pr_debug("Got %u bytes of NOPOUT ping" 1918 " data.\n", payload_length); 1919 pr_debug("Ping Data: \"%s\"\n", ping_data); 1920 } 1921 1922 return iscsit_process_nop_out(conn, cmd, hdr); 1923 out: 1924 if (cmd) 1925 iscsit_free_cmd(cmd, false); 1926 1927 kfree(ping_data); 1928 return ret; 1929 } 1930 1931 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1932 { 1933 switch (iscsi_tmf) { 1934 case ISCSI_TM_FUNC_ABORT_TASK: 1935 return TMR_ABORT_TASK; 1936 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1937 return TMR_ABORT_TASK_SET; 1938 case ISCSI_TM_FUNC_CLEAR_ACA: 1939 return TMR_CLEAR_ACA; 1940 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1941 return TMR_CLEAR_TASK_SET; 1942 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1943 return TMR_LUN_RESET; 1944 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1945 return TMR_TARGET_WARM_RESET; 1946 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1947 return TMR_TARGET_COLD_RESET; 1948 default: 1949 return TMR_UNKNOWN; 1950 } 1951 } 1952 1953 int 1954 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1955 unsigned char *buf) 1956 { 1957 struct se_tmr_req *se_tmr; 1958 struct iscsi_tmr_req *tmr_req; 1959 struct iscsi_tm *hdr; 1960 int out_of_order_cmdsn = 0, ret; 1961 u8 function, tcm_function = TMR_UNKNOWN; 1962 1963 hdr = (struct iscsi_tm *) buf; 1964 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1965 function = hdr->flags; 1966 1967 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1968 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1969 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1970 hdr->rtt, hdr->refcmdsn, conn->cid); 1971 1972 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1973 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1974 hdr->rtt != RESERVED_ITT)) { 1975 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1976 hdr->rtt = RESERVED_ITT; 1977 } 1978 1979 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1980 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1981 pr_err("Task Management Request TASK_REASSIGN not" 1982 " issued as immediate command, bad iSCSI Initiator" 1983 "implementation\n"); 1984 return iscsit_add_reject_cmd(cmd, 1985 ISCSI_REASON_PROTOCOL_ERROR, buf); 1986 } 1987 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1988 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1989 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1990 1991 cmd->data_direction = DMA_NONE; 1992 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1993 if (!cmd->tmr_req) { 1994 return iscsit_add_reject_cmd(cmd, 1995 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1996 buf); 1997 } 1998 1999 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 2000 conn->sess->se_sess, 0, DMA_NONE, 2001 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2002 2003 target_get_sess_cmd(&cmd->se_cmd, true); 2004 2005 /* 2006 * TASK_REASSIGN for ERL=2 / connection stays inside of 2007 * LIO-Target $FABRIC_MOD 2008 */ 2009 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2010 tcm_function = iscsit_convert_tmf(function); 2011 if (tcm_function == TMR_UNKNOWN) { 2012 pr_err("Unknown iSCSI TMR Function:" 2013 " 0x%02x\n", function); 2014 return iscsit_add_reject_cmd(cmd, 2015 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2016 } 2017 } 2018 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2019 GFP_KERNEL); 2020 if (ret < 0) 2021 return iscsit_add_reject_cmd(cmd, 2022 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2023 2024 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2025 2026 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2027 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2028 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2029 cmd->init_task_tag = hdr->itt; 2030 cmd->targ_xfer_tag = 0xFFFFFFFF; 2031 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2032 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2033 se_tmr = cmd->se_cmd.se_tmr_req; 2034 tmr_req = cmd->tmr_req; 2035 /* 2036 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2037 */ 2038 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2039 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2040 scsilun_to_int(&hdr->lun)); 2041 if (ret < 0) { 2042 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2043 goto attach; 2044 } 2045 } 2046 2047 switch (function) { 2048 case ISCSI_TM_FUNC_ABORT_TASK: 2049 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2050 if (se_tmr->response) 2051 goto attach; 2052 break; 2053 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2054 case ISCSI_TM_FUNC_CLEAR_ACA: 2055 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2056 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2057 break; 2058 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2059 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2060 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2061 goto attach; 2062 } 2063 break; 2064 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2065 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2066 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2067 goto attach; 2068 } 2069 break; 2070 case ISCSI_TM_FUNC_TASK_REASSIGN: 2071 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2072 /* 2073 * Perform sanity checks on the ExpDataSN only if the 2074 * TASK_REASSIGN was successful. 2075 */ 2076 if (se_tmr->response) 2077 break; 2078 2079 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2080 return iscsit_add_reject_cmd(cmd, 2081 ISCSI_REASON_BOOKMARK_INVALID, buf); 2082 break; 2083 default: 2084 pr_err("Unknown TMR function: 0x%02x, protocol" 2085 " error.\n", function); 2086 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2087 goto attach; 2088 } 2089 2090 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2091 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2092 se_tmr->call_transport = 1; 2093 attach: 2094 spin_lock_bh(&conn->cmd_lock); 2095 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2096 spin_unlock_bh(&conn->cmd_lock); 2097 2098 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2099 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2100 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2101 out_of_order_cmdsn = 1; 2102 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2103 target_put_sess_cmd(&cmd->se_cmd); 2104 return 0; 2105 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2106 return -1; 2107 } 2108 } 2109 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2110 2111 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2112 return 0; 2113 /* 2114 * Found the referenced task, send to transport for processing. 2115 */ 2116 if (se_tmr->call_transport) 2117 return transport_generic_handle_tmr(&cmd->se_cmd); 2118 2119 /* 2120 * Could not find the referenced LUN, task, or Task Management 2121 * command not authorized or supported. Change state and 2122 * let the tx_thread send the response. 2123 * 2124 * For connection recovery, this is also the default action for 2125 * TMR TASK_REASSIGN. 2126 */ 2127 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2128 target_put_sess_cmd(&cmd->se_cmd); 2129 return 0; 2130 } 2131 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2132 2133 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2134 int 2135 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2136 struct iscsi_text *hdr) 2137 { 2138 u32 payload_length = ntoh24(hdr->dlength); 2139 2140 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2141 pr_err("Unable to accept text parameter length: %u" 2142 "greater than MaxXmitDataSegmentLength %u.\n", 2143 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2144 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2145 (unsigned char *)hdr); 2146 } 2147 2148 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2149 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2150 pr_err("Multi sequence text commands currently not supported\n"); 2151 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2152 (unsigned char *)hdr); 2153 } 2154 2155 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2156 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2157 hdr->exp_statsn, payload_length); 2158 2159 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2160 cmd->i_state = ISTATE_SEND_TEXTRSP; 2161 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2162 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2163 cmd->targ_xfer_tag = 0xFFFFFFFF; 2164 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2165 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2166 cmd->data_direction = DMA_NONE; 2167 kfree(cmd->text_in_ptr); 2168 cmd->text_in_ptr = NULL; 2169 2170 return 0; 2171 } 2172 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2173 2174 int 2175 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2176 struct iscsi_text *hdr) 2177 { 2178 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2179 int cmdsn_ret; 2180 2181 if (!text_in) { 2182 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2183 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2184 pr_err("Unable to locate text_in buffer for sendtargets" 2185 " discovery\n"); 2186 goto reject; 2187 } 2188 goto empty_sendtargets; 2189 } 2190 if (strncmp("SendTargets", text_in, 11) != 0) { 2191 pr_err("Received Text Data that is not" 2192 " SendTargets, cannot continue.\n"); 2193 goto reject; 2194 } 2195 text_ptr = strchr(text_in, '='); 2196 if (!text_ptr) { 2197 pr_err("No \"=\" separator found in Text Data," 2198 " cannot continue.\n"); 2199 goto reject; 2200 } 2201 if (!strncmp("=All", text_ptr, 4)) { 2202 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2203 } else if (!strncmp("=iqn.", text_ptr, 5) || 2204 !strncmp("=eui.", text_ptr, 5)) { 2205 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2206 } else { 2207 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2208 goto reject; 2209 } 2210 2211 spin_lock_bh(&conn->cmd_lock); 2212 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2213 spin_unlock_bh(&conn->cmd_lock); 2214 2215 empty_sendtargets: 2216 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2217 2218 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2219 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2220 (unsigned char *)hdr, hdr->cmdsn); 2221 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2222 return -1; 2223 2224 return 0; 2225 } 2226 2227 return iscsit_execute_cmd(cmd, 0); 2228 2229 reject: 2230 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2231 (unsigned char *)hdr); 2232 } 2233 EXPORT_SYMBOL(iscsit_process_text_cmd); 2234 2235 static int 2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2237 unsigned char *buf) 2238 { 2239 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2240 char *text_in = NULL; 2241 u32 payload_length = ntoh24(hdr->dlength); 2242 int rx_size, rc; 2243 2244 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2245 if (rc < 0) 2246 return 0; 2247 2248 rx_size = payload_length; 2249 if (payload_length) { 2250 u32 checksum = 0, data_crc = 0; 2251 u32 padding = 0, pad_bytes = 0; 2252 int niov = 0, rx_got; 2253 struct kvec iov[3]; 2254 2255 text_in = kzalloc(payload_length, GFP_KERNEL); 2256 if (!text_in) 2257 goto reject; 2258 2259 cmd->text_in_ptr = text_in; 2260 2261 memset(iov, 0, 3 * sizeof(struct kvec)); 2262 iov[niov].iov_base = text_in; 2263 iov[niov++].iov_len = payload_length; 2264 2265 padding = ((-payload_length) & 3); 2266 if (padding != 0) { 2267 iov[niov].iov_base = &pad_bytes; 2268 iov[niov++].iov_len = padding; 2269 rx_size += padding; 2270 pr_debug("Receiving %u additional bytes" 2271 " for padding.\n", padding); 2272 } 2273 if (conn->conn_ops->DataDigest) { 2274 iov[niov].iov_base = &checksum; 2275 iov[niov++].iov_len = ISCSI_CRC_LEN; 2276 rx_size += ISCSI_CRC_LEN; 2277 } 2278 2279 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2280 if (rx_got != rx_size) 2281 goto reject; 2282 2283 if (conn->conn_ops->DataDigest) { 2284 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in, 2285 payload_length, padding, 2286 &pad_bytes, &data_crc); 2287 2288 if (checksum != data_crc) { 2289 pr_err("Text data CRC32C DataDigest" 2290 " 0x%08x does not match computed" 2291 " 0x%08x\n", checksum, data_crc); 2292 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2293 pr_err("Unable to recover from" 2294 " Text Data digest failure while in" 2295 " ERL=0.\n"); 2296 goto reject; 2297 } else { 2298 /* 2299 * Silently drop this PDU and let the 2300 * initiator plug the CmdSN gap. 2301 */ 2302 pr_debug("Dropping Text" 2303 " Command CmdSN: 0x%08x due to" 2304 " DataCRC error.\n", hdr->cmdsn); 2305 kfree(text_in); 2306 return 0; 2307 } 2308 } else { 2309 pr_debug("Got CRC32C DataDigest" 2310 " 0x%08x for %u bytes of text data.\n", 2311 checksum, payload_length); 2312 } 2313 } 2314 text_in[payload_length - 1] = '\0'; 2315 pr_debug("Successfully read %d bytes of text" 2316 " data.\n", payload_length); 2317 } 2318 2319 return iscsit_process_text_cmd(conn, cmd, hdr); 2320 2321 reject: 2322 kfree(cmd->text_in_ptr); 2323 cmd->text_in_ptr = NULL; 2324 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2325 } 2326 2327 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2328 { 2329 struct iscsi_conn *conn_p; 2330 struct iscsi_session *sess = conn->sess; 2331 2332 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2333 " for SID: %u.\n", conn->cid, conn->sess->sid); 2334 2335 atomic_set(&sess->session_logout, 1); 2336 atomic_set(&conn->conn_logout_remove, 1); 2337 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2338 2339 iscsit_inc_conn_usage_count(conn); 2340 iscsit_inc_session_usage_count(sess); 2341 2342 spin_lock_bh(&sess->conn_lock); 2343 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2344 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2345 continue; 2346 2347 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2348 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2349 } 2350 spin_unlock_bh(&sess->conn_lock); 2351 2352 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2353 2354 return 0; 2355 } 2356 2357 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2358 { 2359 struct iscsi_conn *l_conn; 2360 struct iscsi_session *sess = conn->sess; 2361 2362 pr_debug("Received logout request CLOSECONNECTION for CID:" 2363 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2364 2365 /* 2366 * A Logout Request with a CLOSECONNECTION reason code for a CID 2367 * can arrive on a connection with a differing CID. 2368 */ 2369 if (conn->cid == cmd->logout_cid) { 2370 spin_lock_bh(&conn->state_lock); 2371 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2372 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2373 2374 atomic_set(&conn->conn_logout_remove, 1); 2375 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2376 iscsit_inc_conn_usage_count(conn); 2377 2378 spin_unlock_bh(&conn->state_lock); 2379 } else { 2380 /* 2381 * Handle all different cid CLOSECONNECTION requests in 2382 * iscsit_logout_post_handler_diffcid() as to give enough 2383 * time for any non immediate command's CmdSN to be 2384 * acknowledged on the connection in question. 2385 * 2386 * Here we simply make sure the CID is still around. 2387 */ 2388 l_conn = iscsit_get_conn_from_cid(sess, 2389 cmd->logout_cid); 2390 if (!l_conn) { 2391 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2392 iscsit_add_cmd_to_response_queue(cmd, conn, 2393 cmd->i_state); 2394 return 0; 2395 } 2396 2397 iscsit_dec_conn_usage_count(l_conn); 2398 } 2399 2400 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2401 2402 return 0; 2403 } 2404 2405 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2406 { 2407 struct iscsi_session *sess = conn->sess; 2408 2409 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2410 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2411 2412 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2413 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2414 " while ERL!=2.\n"); 2415 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2417 return 0; 2418 } 2419 2420 if (conn->cid == cmd->logout_cid) { 2421 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2422 " with CID: %hu on CID: %hu, implementation error.\n", 2423 cmd->logout_cid, conn->cid); 2424 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2425 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2426 return 0; 2427 } 2428 2429 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2430 2431 return 0; 2432 } 2433 2434 int 2435 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2436 unsigned char *buf) 2437 { 2438 int cmdsn_ret, logout_remove = 0; 2439 u8 reason_code = 0; 2440 struct iscsi_logout *hdr; 2441 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2442 2443 hdr = (struct iscsi_logout *) buf; 2444 reason_code = (hdr->flags & 0x7f); 2445 2446 if (tiqn) { 2447 spin_lock(&tiqn->logout_stats.lock); 2448 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2449 tiqn->logout_stats.normal_logouts++; 2450 else 2451 tiqn->logout_stats.abnormal_logouts++; 2452 spin_unlock(&tiqn->logout_stats.lock); 2453 } 2454 2455 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2456 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2457 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2458 hdr->cid, conn->cid); 2459 2460 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2461 pr_err("Received logout request on connection that" 2462 " is not in logged in state, ignoring request.\n"); 2463 iscsit_free_cmd(cmd, false); 2464 return 0; 2465 } 2466 2467 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2468 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2469 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2470 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2471 cmd->targ_xfer_tag = 0xFFFFFFFF; 2472 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2473 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2474 cmd->logout_cid = be16_to_cpu(hdr->cid); 2475 cmd->logout_reason = reason_code; 2476 cmd->data_direction = DMA_NONE; 2477 2478 /* 2479 * We need to sleep in these cases (by returning 1) until the Logout 2480 * Response gets sent in the tx thread. 2481 */ 2482 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2483 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2484 be16_to_cpu(hdr->cid) == conn->cid)) 2485 logout_remove = 1; 2486 2487 spin_lock_bh(&conn->cmd_lock); 2488 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2489 spin_unlock_bh(&conn->cmd_lock); 2490 2491 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2492 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2493 2494 /* 2495 * Immediate commands are executed, well, immediately. 2496 * Non-Immediate Logout Commands are executed in CmdSN order. 2497 */ 2498 if (cmd->immediate_cmd) { 2499 int ret = iscsit_execute_cmd(cmd, 0); 2500 2501 if (ret < 0) 2502 return ret; 2503 } else { 2504 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2505 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2506 logout_remove = 0; 2507 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2508 return -1; 2509 } 2510 2511 return logout_remove; 2512 } 2513 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2514 2515 int iscsit_handle_snack( 2516 struct iscsi_conn *conn, 2517 unsigned char *buf) 2518 { 2519 struct iscsi_snack *hdr; 2520 2521 hdr = (struct iscsi_snack *) buf; 2522 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2523 2524 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2525 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2526 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2527 hdr->begrun, hdr->runlength, conn->cid); 2528 2529 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2530 pr_err("Initiator sent SNACK request while in" 2531 " ErrorRecoveryLevel=0.\n"); 2532 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2533 buf); 2534 } 2535 /* 2536 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2537 * call from inside iscsi_send_recovery_datain_or_r2t(). 2538 */ 2539 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2540 case 0: 2541 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2542 hdr->itt, 2543 be32_to_cpu(hdr->ttt), 2544 be32_to_cpu(hdr->begrun), 2545 be32_to_cpu(hdr->runlength)); 2546 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2547 return iscsit_handle_status_snack(conn, hdr->itt, 2548 be32_to_cpu(hdr->ttt), 2549 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2550 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2551 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2552 be32_to_cpu(hdr->begrun), 2553 be32_to_cpu(hdr->runlength)); 2554 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2555 /* FIXME: Support R-Data SNACK */ 2556 pr_err("R-Data SNACK Not Supported.\n"); 2557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2558 buf); 2559 default: 2560 pr_err("Unknown SNACK type 0x%02x, protocol" 2561 " error.\n", hdr->flags & 0x0f); 2562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2563 buf); 2564 } 2565 2566 return 0; 2567 } 2568 EXPORT_SYMBOL(iscsit_handle_snack); 2569 2570 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2571 { 2572 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2573 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2574 wait_for_completion_interruptible_timeout( 2575 &conn->rx_half_close_comp, 2576 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2577 } 2578 } 2579 2580 static int iscsit_handle_immediate_data( 2581 struct iscsi_cmd *cmd, 2582 struct iscsi_scsi_req *hdr, 2583 u32 length) 2584 { 2585 int iov_ret, rx_got = 0, rx_size = 0; 2586 u32 checksum, iov_count = 0, padding = 0; 2587 struct iscsi_conn *conn = cmd->conn; 2588 struct kvec *iov; 2589 2590 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2591 if (iov_ret < 0) 2592 return IMMEDIATE_DATA_CANNOT_RECOVER; 2593 2594 rx_size = length; 2595 iov_count = iov_ret; 2596 iov = &cmd->iov_data[0]; 2597 2598 padding = ((-length) & 3); 2599 if (padding != 0) { 2600 iov[iov_count].iov_base = cmd->pad_bytes; 2601 iov[iov_count++].iov_len = padding; 2602 rx_size += padding; 2603 } 2604 2605 if (conn->conn_ops->DataDigest) { 2606 iov[iov_count].iov_base = &checksum; 2607 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2608 rx_size += ISCSI_CRC_LEN; 2609 } 2610 2611 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2612 2613 iscsit_unmap_iovec(cmd); 2614 2615 if (rx_got != rx_size) { 2616 iscsit_rx_thread_wait_for_tcp(conn); 2617 return IMMEDIATE_DATA_CANNOT_RECOVER; 2618 } 2619 2620 if (conn->conn_ops->DataDigest) { 2621 u32 data_crc; 2622 2623 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2624 cmd->write_data_done, length, padding, 2625 cmd->pad_bytes); 2626 2627 if (checksum != data_crc) { 2628 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2629 " does not match computed 0x%08x\n", checksum, 2630 data_crc); 2631 2632 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2633 pr_err("Unable to recover from" 2634 " Immediate Data digest failure while" 2635 " in ERL=0.\n"); 2636 iscsit_reject_cmd(cmd, 2637 ISCSI_REASON_DATA_DIGEST_ERROR, 2638 (unsigned char *)hdr); 2639 return IMMEDIATE_DATA_CANNOT_RECOVER; 2640 } else { 2641 iscsit_reject_cmd(cmd, 2642 ISCSI_REASON_DATA_DIGEST_ERROR, 2643 (unsigned char *)hdr); 2644 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2645 } 2646 } else { 2647 pr_debug("Got CRC32C DataDigest 0x%08x for" 2648 " %u bytes of Immediate Data\n", checksum, 2649 length); 2650 } 2651 } 2652 2653 cmd->write_data_done += length; 2654 2655 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2656 spin_lock_bh(&cmd->istate_lock); 2657 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2658 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2659 spin_unlock_bh(&cmd->istate_lock); 2660 } 2661 2662 return IMMEDIATE_DATA_NORMAL_OPERATION; 2663 } 2664 2665 /* 2666 * Called with sess->conn_lock held. 2667 */ 2668 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2669 with active network interface */ 2670 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2671 { 2672 struct iscsi_cmd *cmd; 2673 struct iscsi_conn *conn_p; 2674 bool found = false; 2675 2676 /* 2677 * Only send a Asynchronous Message on connections whos network 2678 * interface is still functional. 2679 */ 2680 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2681 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2682 iscsit_inc_conn_usage_count(conn_p); 2683 found = true; 2684 break; 2685 } 2686 } 2687 2688 if (!found) 2689 return; 2690 2691 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2692 if (!cmd) { 2693 iscsit_dec_conn_usage_count(conn_p); 2694 return; 2695 } 2696 2697 cmd->logout_cid = conn->cid; 2698 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2699 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2700 2701 spin_lock_bh(&conn_p->cmd_lock); 2702 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2703 spin_unlock_bh(&conn_p->cmd_lock); 2704 2705 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2706 iscsit_dec_conn_usage_count(conn_p); 2707 } 2708 2709 static int iscsit_send_conn_drop_async_message( 2710 struct iscsi_cmd *cmd, 2711 struct iscsi_conn *conn) 2712 { 2713 struct iscsi_async *hdr; 2714 2715 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2716 2717 hdr = (struct iscsi_async *) cmd->pdu; 2718 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2719 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2720 cmd->init_task_tag = RESERVED_ITT; 2721 cmd->targ_xfer_tag = 0xFFFFFFFF; 2722 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2723 cmd->stat_sn = conn->stat_sn++; 2724 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2725 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2726 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2727 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2728 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2729 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2730 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2731 2732 pr_debug("Sending Connection Dropped Async Message StatSN:" 2733 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2734 cmd->logout_cid, conn->cid); 2735 2736 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2737 } 2738 2739 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2740 { 2741 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2742 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2743 wait_for_completion_interruptible_timeout( 2744 &conn->tx_half_close_comp, 2745 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2746 } 2747 } 2748 2749 void 2750 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2751 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2752 bool set_statsn) 2753 { 2754 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2755 hdr->flags = datain->flags; 2756 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2757 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2758 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2759 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2760 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2761 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2763 } 2764 } 2765 hton24(hdr->dlength, datain->length); 2766 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2767 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2768 (struct scsi_lun *)&hdr->lun); 2769 else 2770 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2771 2772 hdr->itt = cmd->init_task_tag; 2773 2774 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2775 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2776 else 2777 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2778 if (set_statsn) 2779 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2780 else 2781 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2782 2783 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2784 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2785 hdr->datasn = cpu_to_be32(datain->data_sn); 2786 hdr->offset = cpu_to_be32(datain->offset); 2787 2788 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2789 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2790 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2791 ntohl(hdr->offset), datain->length, conn->cid); 2792 } 2793 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2794 2795 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2796 { 2797 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2798 struct iscsi_datain datain; 2799 struct iscsi_datain_req *dr; 2800 int eodr = 0, ret; 2801 bool set_statsn = false; 2802 2803 memset(&datain, 0, sizeof(struct iscsi_datain)); 2804 dr = iscsit_get_datain_values(cmd, &datain); 2805 if (!dr) { 2806 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2807 cmd->init_task_tag); 2808 return -1; 2809 } 2810 /* 2811 * Be paranoid and double check the logic for now. 2812 */ 2813 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2814 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2815 " datain.length: %u exceeds cmd->data_length: %u\n", 2816 cmd->init_task_tag, datain.offset, datain.length, 2817 cmd->se_cmd.data_length); 2818 return -1; 2819 } 2820 2821 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2822 /* 2823 * Special case for successfully execution w/ both DATAIN 2824 * and Sense Data. 2825 */ 2826 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2827 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2828 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2829 else { 2830 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2831 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2832 iscsit_increment_maxcmdsn(cmd, conn->sess); 2833 cmd->stat_sn = conn->stat_sn++; 2834 set_statsn = true; 2835 } else if (dr->dr_complete == 2836 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2837 set_statsn = true; 2838 } 2839 2840 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2841 2842 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2843 if (ret < 0) 2844 return ret; 2845 2846 if (dr->dr_complete) { 2847 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2848 2 : 1; 2849 iscsit_free_datain_req(cmd, dr); 2850 } 2851 2852 return eodr; 2853 } 2854 2855 int 2856 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2857 struct iscsi_logout_rsp *hdr) 2858 { 2859 struct iscsi_conn *logout_conn = NULL; 2860 struct iscsi_conn_recovery *cr = NULL; 2861 struct iscsi_session *sess = conn->sess; 2862 /* 2863 * The actual shutting down of Sessions and/or Connections 2864 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2865 * is done in scsi_logout_post_handler(). 2866 */ 2867 switch (cmd->logout_reason) { 2868 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2869 pr_debug("iSCSI session logout successful, setting" 2870 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2871 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2872 break; 2873 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2874 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2875 break; 2876 /* 2877 * For CLOSECONNECTION logout requests carrying 2878 * a matching logout CID -> local CID, the reference 2879 * for the local CID will have been incremented in 2880 * iscsi_logout_closeconnection(). 2881 * 2882 * For CLOSECONNECTION logout requests carrying 2883 * a different CID than the connection it arrived 2884 * on, the connection responding to cmd->logout_cid 2885 * is stopped in iscsit_logout_post_handler_diffcid(). 2886 */ 2887 2888 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2889 " successful.\n", cmd->logout_cid, conn->cid); 2890 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2891 break; 2892 case ISCSI_LOGOUT_REASON_RECOVERY: 2893 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2894 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2895 break; 2896 /* 2897 * If the connection is still active from our point of view 2898 * force connection recovery to occur. 2899 */ 2900 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2901 cmd->logout_cid); 2902 if (logout_conn) { 2903 iscsit_connection_reinstatement_rcfr(logout_conn); 2904 iscsit_dec_conn_usage_count(logout_conn); 2905 } 2906 2907 cr = iscsit_get_inactive_connection_recovery_entry( 2908 conn->sess, cmd->logout_cid); 2909 if (!cr) { 2910 pr_err("Unable to locate CID: %hu for" 2911 " REMOVECONNFORRECOVERY Logout Request.\n", 2912 cmd->logout_cid); 2913 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2914 break; 2915 } 2916 2917 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2918 2919 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2920 " for recovery for CID: %hu on CID: %hu successful.\n", 2921 cmd->logout_cid, conn->cid); 2922 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2923 break; 2924 default: 2925 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2926 cmd->logout_reason); 2927 return -1; 2928 } 2929 2930 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2931 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2932 hdr->response = cmd->logout_response; 2933 hdr->itt = cmd->init_task_tag; 2934 cmd->stat_sn = conn->stat_sn++; 2935 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2936 2937 iscsit_increment_maxcmdsn(cmd, conn->sess); 2938 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2939 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2940 2941 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2942 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2943 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2944 cmd->logout_cid, conn->cid); 2945 2946 return 0; 2947 } 2948 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2949 2950 static int 2951 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2952 { 2953 int rc; 2954 2955 rc = iscsit_build_logout_rsp(cmd, conn, 2956 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2957 if (rc < 0) 2958 return rc; 2959 2960 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2961 } 2962 2963 void 2964 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2965 struct iscsi_nopin *hdr, bool nopout_response) 2966 { 2967 hdr->opcode = ISCSI_OP_NOOP_IN; 2968 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2969 hton24(hdr->dlength, cmd->buf_ptr_size); 2970 if (nopout_response) 2971 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2972 hdr->itt = cmd->init_task_tag; 2973 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2974 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2975 conn->stat_sn; 2976 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2977 2978 if (nopout_response) 2979 iscsit_increment_maxcmdsn(cmd, conn->sess); 2980 2981 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2982 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2983 2984 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2985 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2986 "Solicited" : "Unsolicited", cmd->init_task_tag, 2987 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2988 } 2989 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2990 2991 /* 2992 * Unsolicited NOPIN, either requesting a response or not. 2993 */ 2994 static int iscsit_send_unsolicited_nopin( 2995 struct iscsi_cmd *cmd, 2996 struct iscsi_conn *conn, 2997 int want_response) 2998 { 2999 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3000 int ret; 3001 3002 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3003 3004 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3005 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3006 3007 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3008 if (ret < 0) 3009 return ret; 3010 3011 spin_lock_bh(&cmd->istate_lock); 3012 cmd->i_state = want_response ? 3013 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3014 spin_unlock_bh(&cmd->istate_lock); 3015 3016 return 0; 3017 } 3018 3019 static int 3020 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3021 { 3022 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3023 3024 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3025 3026 /* 3027 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3028 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3029 */ 3030 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3031 3032 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3033 cmd->buf_ptr, 3034 cmd->buf_ptr_size); 3035 } 3036 3037 static int iscsit_send_r2t( 3038 struct iscsi_cmd *cmd, 3039 struct iscsi_conn *conn) 3040 { 3041 struct iscsi_r2t *r2t; 3042 struct iscsi_r2t_rsp *hdr; 3043 int ret; 3044 3045 r2t = iscsit_get_r2t_from_list(cmd); 3046 if (!r2t) 3047 return -1; 3048 3049 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3050 memset(hdr, 0, ISCSI_HDR_LEN); 3051 hdr->opcode = ISCSI_OP_R2T; 3052 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3053 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3054 (struct scsi_lun *)&hdr->lun); 3055 hdr->itt = cmd->init_task_tag; 3056 if (conn->conn_transport->iscsit_get_r2t_ttt) 3057 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3058 else 3059 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3060 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3061 hdr->statsn = cpu_to_be32(conn->stat_sn); 3062 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3063 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3064 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3065 hdr->data_offset = cpu_to_be32(r2t->offset); 3066 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3067 3068 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3069 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3070 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3071 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3072 r2t->offset, r2t->xfer_len, conn->cid); 3073 3074 spin_lock_bh(&cmd->r2t_lock); 3075 r2t->sent_r2t = 1; 3076 spin_unlock_bh(&cmd->r2t_lock); 3077 3078 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3079 if (ret < 0) { 3080 return ret; 3081 } 3082 3083 spin_lock_bh(&cmd->dataout_timeout_lock); 3084 iscsit_start_dataout_timer(cmd, conn); 3085 spin_unlock_bh(&cmd->dataout_timeout_lock); 3086 3087 return 0; 3088 } 3089 3090 /* 3091 * @recovery: If called from iscsi_task_reassign_complete_write() for 3092 * connection recovery. 3093 */ 3094 int iscsit_build_r2ts_for_cmd( 3095 struct iscsi_conn *conn, 3096 struct iscsi_cmd *cmd, 3097 bool recovery) 3098 { 3099 int first_r2t = 1; 3100 u32 offset = 0, xfer_len = 0; 3101 3102 spin_lock_bh(&cmd->r2t_lock); 3103 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3104 spin_unlock_bh(&cmd->r2t_lock); 3105 return 0; 3106 } 3107 3108 if (conn->sess->sess_ops->DataSequenceInOrder && 3109 !recovery) 3110 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3111 3112 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3113 if (conn->sess->sess_ops->DataSequenceInOrder) { 3114 offset = cmd->r2t_offset; 3115 3116 if (first_r2t && recovery) { 3117 int new_data_end = offset + 3118 conn->sess->sess_ops->MaxBurstLength - 3119 cmd->next_burst_len; 3120 3121 if (new_data_end > cmd->se_cmd.data_length) 3122 xfer_len = cmd->se_cmd.data_length - offset; 3123 else 3124 xfer_len = 3125 conn->sess->sess_ops->MaxBurstLength - 3126 cmd->next_burst_len; 3127 } else { 3128 int new_data_end = offset + 3129 conn->sess->sess_ops->MaxBurstLength; 3130 3131 if (new_data_end > cmd->se_cmd.data_length) 3132 xfer_len = cmd->se_cmd.data_length - offset; 3133 else 3134 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3135 } 3136 cmd->r2t_offset += xfer_len; 3137 3138 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3139 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3140 } else { 3141 struct iscsi_seq *seq; 3142 3143 seq = iscsit_get_seq_holder_for_r2t(cmd); 3144 if (!seq) { 3145 spin_unlock_bh(&cmd->r2t_lock); 3146 return -1; 3147 } 3148 3149 offset = seq->offset; 3150 xfer_len = seq->xfer_len; 3151 3152 if (cmd->seq_send_order == cmd->seq_count) 3153 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3154 } 3155 cmd->outstanding_r2ts++; 3156 first_r2t = 0; 3157 3158 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3159 spin_unlock_bh(&cmd->r2t_lock); 3160 return -1; 3161 } 3162 3163 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3164 break; 3165 } 3166 spin_unlock_bh(&cmd->r2t_lock); 3167 3168 return 0; 3169 } 3170 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3171 3172 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3173 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3174 { 3175 if (inc_stat_sn) 3176 cmd->stat_sn = conn->stat_sn++; 3177 3178 atomic_long_inc(&conn->sess->rsp_pdus); 3179 3180 memset(hdr, 0, ISCSI_HDR_LEN); 3181 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3182 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3183 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3184 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3185 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3186 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3187 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3189 } 3190 hdr->response = cmd->iscsi_response; 3191 hdr->cmd_status = cmd->se_cmd.scsi_status; 3192 hdr->itt = cmd->init_task_tag; 3193 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3194 3195 iscsit_increment_maxcmdsn(cmd, conn->sess); 3196 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3197 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3198 3199 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3200 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3201 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3202 cmd->se_cmd.scsi_status, conn->cid); 3203 } 3204 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3205 3206 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3207 { 3208 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3209 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3210 void *data_buf = NULL; 3211 u32 padding = 0, data_buf_len = 0; 3212 3213 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3214 3215 /* 3216 * Attach SENSE DATA payload to iSCSI Response PDU 3217 */ 3218 if (cmd->se_cmd.sense_buffer && 3219 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3220 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3221 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3222 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3223 3224 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3225 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3226 data_buf = cmd->sense_buffer; 3227 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3228 3229 if (padding) { 3230 memset(cmd->sense_buffer + 3231 cmd->se_cmd.scsi_sense_length, 0, padding); 3232 pr_debug("Adding %u bytes of padding to" 3233 " SENSE.\n", padding); 3234 } 3235 3236 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3237 " Response PDU\n", 3238 cmd->se_cmd.scsi_sense_length); 3239 } 3240 3241 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3242 data_buf_len); 3243 } 3244 3245 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3246 { 3247 switch (se_tmr->response) { 3248 case TMR_FUNCTION_COMPLETE: 3249 return ISCSI_TMF_RSP_COMPLETE; 3250 case TMR_TASK_DOES_NOT_EXIST: 3251 return ISCSI_TMF_RSP_NO_TASK; 3252 case TMR_LUN_DOES_NOT_EXIST: 3253 return ISCSI_TMF_RSP_NO_LUN; 3254 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3255 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3256 case TMR_FUNCTION_REJECTED: 3257 default: 3258 return ISCSI_TMF_RSP_REJECTED; 3259 } 3260 } 3261 3262 void 3263 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3264 struct iscsi_tm_rsp *hdr) 3265 { 3266 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3267 3268 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3269 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3270 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3271 hdr->itt = cmd->init_task_tag; 3272 cmd->stat_sn = conn->stat_sn++; 3273 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3274 3275 iscsit_increment_maxcmdsn(cmd, conn->sess); 3276 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3277 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3278 3279 pr_debug("Built Task Management Response ITT: 0x%08x," 3280 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3281 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3282 } 3283 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3284 3285 static int 3286 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3287 { 3288 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3289 3290 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3291 3292 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3293 } 3294 3295 #define SENDTARGETS_BUF_LIMIT 32768U 3296 3297 static int 3298 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3299 enum iscsit_transport_type network_transport, 3300 int skip_bytes, bool *completed) 3301 { 3302 char *payload = NULL; 3303 struct iscsi_conn *conn = cmd->conn; 3304 struct iscsi_portal_group *tpg; 3305 struct iscsi_tiqn *tiqn; 3306 struct iscsi_tpg_np *tpg_np; 3307 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3308 int target_name_printed; 3309 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3310 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3311 bool active; 3312 3313 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3314 SENDTARGETS_BUF_LIMIT); 3315 3316 payload = kzalloc(buffer_len, GFP_KERNEL); 3317 if (!payload) 3318 return -ENOMEM; 3319 3320 /* 3321 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3322 * explicit case.. 3323 */ 3324 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3325 text_ptr = strchr(text_in, '='); 3326 if (!text_ptr) { 3327 pr_err("Unable to locate '=' string in text_in:" 3328 " %s\n", text_in); 3329 kfree(payload); 3330 return -EINVAL; 3331 } 3332 /* 3333 * Skip over '=' character.. 3334 */ 3335 text_ptr += 1; 3336 } 3337 3338 spin_lock(&tiqn_lock); 3339 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3340 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3341 strcmp(tiqn->tiqn, text_ptr)) { 3342 continue; 3343 } 3344 3345 target_name_printed = 0; 3346 3347 spin_lock(&tiqn->tiqn_tpg_lock); 3348 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3349 3350 /* If demo_mode_discovery=0 and generate_node_acls=0 3351 * (demo mode dislabed) do not return 3352 * TargetName+TargetAddress unless a NodeACL exists. 3353 */ 3354 3355 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3356 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3357 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3358 cmd->conn->sess->sess_ops->InitiatorName))) { 3359 continue; 3360 } 3361 3362 spin_lock(&tpg->tpg_state_lock); 3363 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3364 spin_unlock(&tpg->tpg_state_lock); 3365 3366 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3367 continue; 3368 3369 spin_lock(&tpg->tpg_np_lock); 3370 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3371 tpg_np_list) { 3372 struct iscsi_np *np = tpg_np->tpg_np; 3373 struct sockaddr_storage *sockaddr; 3374 3375 if (np->np_network_transport != network_transport) 3376 continue; 3377 3378 if (!target_name_printed) { 3379 len = sprintf(buf, "TargetName=%s", 3380 tiqn->tiqn); 3381 len += 1; 3382 3383 if ((len + payload_len) > buffer_len) { 3384 spin_unlock(&tpg->tpg_np_lock); 3385 spin_unlock(&tiqn->tiqn_tpg_lock); 3386 end_of_buf = 1; 3387 goto eob; 3388 } 3389 3390 if (skip_bytes && len <= skip_bytes) { 3391 skip_bytes -= len; 3392 } else { 3393 memcpy(payload + payload_len, buf, len); 3394 payload_len += len; 3395 target_name_printed = 1; 3396 if (len > skip_bytes) 3397 skip_bytes = 0; 3398 } 3399 } 3400 3401 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3402 sockaddr = &conn->local_sockaddr; 3403 else 3404 sockaddr = &np->np_sockaddr; 3405 3406 len = sprintf(buf, "TargetAddress=" 3407 "%pISpc,%hu", 3408 sockaddr, 3409 tpg->tpgt); 3410 len += 1; 3411 3412 if ((len + payload_len) > buffer_len) { 3413 spin_unlock(&tpg->tpg_np_lock); 3414 spin_unlock(&tiqn->tiqn_tpg_lock); 3415 end_of_buf = 1; 3416 goto eob; 3417 } 3418 3419 if (skip_bytes && len <= skip_bytes) { 3420 skip_bytes -= len; 3421 } else { 3422 memcpy(payload + payload_len, buf, len); 3423 payload_len += len; 3424 if (len > skip_bytes) 3425 skip_bytes = 0; 3426 } 3427 } 3428 spin_unlock(&tpg->tpg_np_lock); 3429 } 3430 spin_unlock(&tiqn->tiqn_tpg_lock); 3431 eob: 3432 if (end_of_buf) { 3433 *completed = false; 3434 break; 3435 } 3436 3437 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3438 break; 3439 } 3440 spin_unlock(&tiqn_lock); 3441 3442 cmd->buf_ptr = payload; 3443 3444 return payload_len; 3445 } 3446 3447 int 3448 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3449 struct iscsi_text_rsp *hdr, 3450 enum iscsit_transport_type network_transport) 3451 { 3452 int text_length, padding; 3453 bool completed = true; 3454 3455 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3456 cmd->read_data_done, 3457 &completed); 3458 if (text_length < 0) 3459 return text_length; 3460 3461 if (completed) { 3462 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3463 } else { 3464 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3465 cmd->read_data_done += text_length; 3466 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3467 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3468 } 3469 hdr->opcode = ISCSI_OP_TEXT_RSP; 3470 padding = ((-text_length) & 3); 3471 hton24(hdr->dlength, text_length); 3472 hdr->itt = cmd->init_task_tag; 3473 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3474 cmd->stat_sn = conn->stat_sn++; 3475 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3476 3477 iscsit_increment_maxcmdsn(cmd, conn->sess); 3478 /* 3479 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3480 * correctly increment MaxCmdSN for each response answering a 3481 * non immediate text request with a valid CmdSN. 3482 */ 3483 cmd->maxcmdsn_inc = 0; 3484 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3485 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3486 3487 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3488 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3489 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3490 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3491 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3492 3493 return text_length + padding; 3494 } 3495 EXPORT_SYMBOL(iscsit_build_text_rsp); 3496 3497 static int iscsit_send_text_rsp( 3498 struct iscsi_cmd *cmd, 3499 struct iscsi_conn *conn) 3500 { 3501 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3502 int text_length; 3503 3504 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3505 conn->conn_transport->transport_type); 3506 if (text_length < 0) 3507 return text_length; 3508 3509 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3510 cmd->buf_ptr, 3511 text_length); 3512 } 3513 3514 void 3515 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3516 struct iscsi_reject *hdr) 3517 { 3518 hdr->opcode = ISCSI_OP_REJECT; 3519 hdr->reason = cmd->reject_reason; 3520 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3521 hton24(hdr->dlength, ISCSI_HDR_LEN); 3522 hdr->ffffffff = cpu_to_be32(0xffffffff); 3523 cmd->stat_sn = conn->stat_sn++; 3524 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3525 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3526 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3527 3528 } 3529 EXPORT_SYMBOL(iscsit_build_reject); 3530 3531 static int iscsit_send_reject( 3532 struct iscsi_cmd *cmd, 3533 struct iscsi_conn *conn) 3534 { 3535 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3536 3537 iscsit_build_reject(cmd, conn, hdr); 3538 3539 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3540 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3541 3542 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3543 cmd->buf_ptr, 3544 ISCSI_HDR_LEN); 3545 } 3546 3547 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3548 { 3549 int ord, cpu; 3550 /* 3551 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3552 * within iscsit_start_kthreads() 3553 * 3554 * Here we use bitmap_id to determine which CPU that this 3555 * iSCSI connection's RX/TX threads will be scheduled to 3556 * execute upon. 3557 */ 3558 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3559 for_each_online_cpu(cpu) { 3560 if (ord-- == 0) { 3561 cpumask_set_cpu(cpu, conn->conn_cpumask); 3562 return; 3563 } 3564 } 3565 /* 3566 * This should never be reached.. 3567 */ 3568 dump_stack(); 3569 cpumask_setall(conn->conn_cpumask); 3570 } 3571 3572 int 3573 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3574 { 3575 int ret; 3576 3577 switch (state) { 3578 case ISTATE_SEND_R2T: 3579 ret = iscsit_send_r2t(cmd, conn); 3580 if (ret < 0) 3581 goto err; 3582 break; 3583 case ISTATE_REMOVE: 3584 spin_lock_bh(&conn->cmd_lock); 3585 list_del_init(&cmd->i_conn_node); 3586 spin_unlock_bh(&conn->cmd_lock); 3587 3588 iscsit_free_cmd(cmd, false); 3589 break; 3590 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3591 iscsit_mod_nopin_response_timer(conn); 3592 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3593 if (ret < 0) 3594 goto err; 3595 break; 3596 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3597 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3598 if (ret < 0) 3599 goto err; 3600 break; 3601 default: 3602 pr_err("Unknown Opcode: 0x%02x ITT:" 3603 " 0x%08x, i_state: %d on CID: %hu\n", 3604 cmd->iscsi_opcode, cmd->init_task_tag, state, 3605 conn->cid); 3606 goto err; 3607 } 3608 3609 return 0; 3610 3611 err: 3612 return -1; 3613 } 3614 EXPORT_SYMBOL(iscsit_immediate_queue); 3615 3616 static int 3617 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3618 { 3619 struct iscsit_transport *t = conn->conn_transport; 3620 struct iscsi_queue_req *qr; 3621 struct iscsi_cmd *cmd; 3622 u8 state; 3623 int ret; 3624 3625 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3626 atomic_set(&conn->check_immediate_queue, 0); 3627 cmd = qr->cmd; 3628 state = qr->state; 3629 kmem_cache_free(lio_qr_cache, qr); 3630 3631 ret = t->iscsit_immediate_queue(conn, cmd, state); 3632 if (ret < 0) 3633 return ret; 3634 } 3635 3636 return 0; 3637 } 3638 3639 int 3640 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3641 { 3642 int ret; 3643 3644 check_rsp_state: 3645 switch (state) { 3646 case ISTATE_SEND_DATAIN: 3647 ret = iscsit_send_datain(cmd, conn); 3648 if (ret < 0) 3649 goto err; 3650 else if (!ret) 3651 /* more drs */ 3652 goto check_rsp_state; 3653 else if (ret == 1) { 3654 /* all done */ 3655 spin_lock_bh(&cmd->istate_lock); 3656 cmd->i_state = ISTATE_SENT_STATUS; 3657 spin_unlock_bh(&cmd->istate_lock); 3658 3659 if (atomic_read(&conn->check_immediate_queue)) 3660 return 1; 3661 3662 return 0; 3663 } else if (ret == 2) { 3664 /* Still must send status, 3665 SCF_TRANSPORT_TASK_SENSE was set */ 3666 spin_lock_bh(&cmd->istate_lock); 3667 cmd->i_state = ISTATE_SEND_STATUS; 3668 spin_unlock_bh(&cmd->istate_lock); 3669 state = ISTATE_SEND_STATUS; 3670 goto check_rsp_state; 3671 } 3672 3673 break; 3674 case ISTATE_SEND_STATUS: 3675 case ISTATE_SEND_STATUS_RECOVERY: 3676 ret = iscsit_send_response(cmd, conn); 3677 break; 3678 case ISTATE_SEND_LOGOUTRSP: 3679 ret = iscsit_send_logout(cmd, conn); 3680 break; 3681 case ISTATE_SEND_ASYNCMSG: 3682 ret = iscsit_send_conn_drop_async_message( 3683 cmd, conn); 3684 break; 3685 case ISTATE_SEND_NOPIN: 3686 ret = iscsit_send_nopin(cmd, conn); 3687 break; 3688 case ISTATE_SEND_REJECT: 3689 ret = iscsit_send_reject(cmd, conn); 3690 break; 3691 case ISTATE_SEND_TASKMGTRSP: 3692 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3693 if (ret != 0) 3694 break; 3695 ret = iscsit_tmr_post_handler(cmd, conn); 3696 if (ret != 0) 3697 iscsit_fall_back_to_erl0(conn->sess); 3698 break; 3699 case ISTATE_SEND_TEXTRSP: 3700 ret = iscsit_send_text_rsp(cmd, conn); 3701 break; 3702 default: 3703 pr_err("Unknown Opcode: 0x%02x ITT:" 3704 " 0x%08x, i_state: %d on CID: %hu\n", 3705 cmd->iscsi_opcode, cmd->init_task_tag, 3706 state, conn->cid); 3707 goto err; 3708 } 3709 if (ret < 0) 3710 goto err; 3711 3712 switch (state) { 3713 case ISTATE_SEND_LOGOUTRSP: 3714 if (!iscsit_logout_post_handler(cmd, conn)) 3715 return -ECONNRESET; 3716 /* fall through */ 3717 case ISTATE_SEND_STATUS: 3718 case ISTATE_SEND_ASYNCMSG: 3719 case ISTATE_SEND_NOPIN: 3720 case ISTATE_SEND_STATUS_RECOVERY: 3721 case ISTATE_SEND_TEXTRSP: 3722 case ISTATE_SEND_TASKMGTRSP: 3723 case ISTATE_SEND_REJECT: 3724 spin_lock_bh(&cmd->istate_lock); 3725 cmd->i_state = ISTATE_SENT_STATUS; 3726 spin_unlock_bh(&cmd->istate_lock); 3727 break; 3728 default: 3729 pr_err("Unknown Opcode: 0x%02x ITT:" 3730 " 0x%08x, i_state: %d on CID: %hu\n", 3731 cmd->iscsi_opcode, cmd->init_task_tag, 3732 cmd->i_state, conn->cid); 3733 goto err; 3734 } 3735 3736 if (atomic_read(&conn->check_immediate_queue)) 3737 return 1; 3738 3739 return 0; 3740 3741 err: 3742 return -1; 3743 } 3744 EXPORT_SYMBOL(iscsit_response_queue); 3745 3746 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3747 { 3748 struct iscsit_transport *t = conn->conn_transport; 3749 struct iscsi_queue_req *qr; 3750 struct iscsi_cmd *cmd; 3751 u8 state; 3752 int ret; 3753 3754 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3755 cmd = qr->cmd; 3756 state = qr->state; 3757 kmem_cache_free(lio_qr_cache, qr); 3758 3759 ret = t->iscsit_response_queue(conn, cmd, state); 3760 if (ret == 1 || ret < 0) 3761 return ret; 3762 } 3763 3764 return 0; 3765 } 3766 3767 int iscsi_target_tx_thread(void *arg) 3768 { 3769 int ret = 0; 3770 struct iscsi_conn *conn = arg; 3771 bool conn_freed = false; 3772 3773 /* 3774 * Allow ourselves to be interrupted by SIGINT so that a 3775 * connection recovery / failure event can be triggered externally. 3776 */ 3777 allow_signal(SIGINT); 3778 3779 while (!kthread_should_stop()) { 3780 /* 3781 * Ensure that both TX and RX per connection kthreads 3782 * are scheduled to run on the same CPU. 3783 */ 3784 iscsit_thread_check_cpumask(conn, current, 1); 3785 3786 wait_event_interruptible(conn->queues_wq, 3787 !iscsit_conn_all_queues_empty(conn)); 3788 3789 if (signal_pending(current)) 3790 goto transport_err; 3791 3792 get_immediate: 3793 ret = iscsit_handle_immediate_queue(conn); 3794 if (ret < 0) 3795 goto transport_err; 3796 3797 ret = iscsit_handle_response_queue(conn); 3798 if (ret == 1) { 3799 goto get_immediate; 3800 } else if (ret == -ECONNRESET) { 3801 conn_freed = true; 3802 goto out; 3803 } else if (ret < 0) { 3804 goto transport_err; 3805 } 3806 } 3807 3808 transport_err: 3809 /* 3810 * Avoid the normal connection failure code-path if this connection 3811 * is still within LOGIN mode, and iscsi_np process context is 3812 * responsible for cleaning up the early connection failure. 3813 */ 3814 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3815 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3816 out: 3817 if (!conn_freed) { 3818 while (!kthread_should_stop()) { 3819 msleep(100); 3820 } 3821 } 3822 return 0; 3823 } 3824 3825 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3826 { 3827 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3828 struct iscsi_cmd *cmd; 3829 int ret = 0; 3830 3831 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3832 case ISCSI_OP_SCSI_CMD: 3833 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3834 if (!cmd) 3835 goto reject; 3836 3837 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3838 break; 3839 case ISCSI_OP_SCSI_DATA_OUT: 3840 ret = iscsit_handle_data_out(conn, buf); 3841 break; 3842 case ISCSI_OP_NOOP_OUT: 3843 cmd = NULL; 3844 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3845 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3846 if (!cmd) 3847 goto reject; 3848 } 3849 ret = iscsit_handle_nop_out(conn, cmd, buf); 3850 break; 3851 case ISCSI_OP_SCSI_TMFUNC: 3852 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3853 if (!cmd) 3854 goto reject; 3855 3856 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3857 break; 3858 case ISCSI_OP_TEXT: 3859 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3860 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3861 if (!cmd) 3862 goto reject; 3863 } else { 3864 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3865 if (!cmd) 3866 goto reject; 3867 } 3868 3869 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3870 break; 3871 case ISCSI_OP_LOGOUT: 3872 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3873 if (!cmd) 3874 goto reject; 3875 3876 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3877 if (ret > 0) 3878 wait_for_completion_timeout(&conn->conn_logout_comp, 3879 SECONDS_FOR_LOGOUT_COMP * HZ); 3880 break; 3881 case ISCSI_OP_SNACK: 3882 ret = iscsit_handle_snack(conn, buf); 3883 break; 3884 default: 3885 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3886 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3887 pr_err("Cannot recover from unknown" 3888 " opcode while ERL=0, closing iSCSI connection.\n"); 3889 return -1; 3890 } 3891 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3892 " closing iSCSI connection.\n"); 3893 ret = -1; 3894 break; 3895 } 3896 3897 return ret; 3898 reject: 3899 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3900 } 3901 3902 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3903 { 3904 bool ret; 3905 3906 spin_lock_bh(&conn->state_lock); 3907 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3908 spin_unlock_bh(&conn->state_lock); 3909 3910 return ret; 3911 } 3912 3913 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3914 { 3915 int ret; 3916 u8 buffer[ISCSI_HDR_LEN], opcode; 3917 u32 checksum = 0, digest = 0; 3918 struct kvec iov; 3919 3920 while (!kthread_should_stop()) { 3921 /* 3922 * Ensure that both TX and RX per connection kthreads 3923 * are scheduled to run on the same CPU. 3924 */ 3925 iscsit_thread_check_cpumask(conn, current, 0); 3926 3927 memset(buffer, 0, ISCSI_HDR_LEN); 3928 memset(&iov, 0, sizeof(struct kvec)); 3929 3930 iov.iov_base = buffer; 3931 iov.iov_len = ISCSI_HDR_LEN; 3932 3933 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3934 if (ret != ISCSI_HDR_LEN) { 3935 iscsit_rx_thread_wait_for_tcp(conn); 3936 return; 3937 } 3938 3939 if (conn->conn_ops->HeaderDigest) { 3940 iov.iov_base = &digest; 3941 iov.iov_len = ISCSI_CRC_LEN; 3942 3943 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3944 if (ret != ISCSI_CRC_LEN) { 3945 iscsit_rx_thread_wait_for_tcp(conn); 3946 return; 3947 } 3948 3949 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3950 ISCSI_HDR_LEN, 0, NULL, 3951 &checksum); 3952 3953 if (digest != checksum) { 3954 pr_err("HeaderDigest CRC32C failed," 3955 " received 0x%08x, computed 0x%08x\n", 3956 digest, checksum); 3957 /* 3958 * Set the PDU to 0xff so it will intentionally 3959 * hit default in the switch below. 3960 */ 3961 memset(buffer, 0xff, ISCSI_HDR_LEN); 3962 atomic_long_inc(&conn->sess->conn_digest_errors); 3963 } else { 3964 pr_debug("Got HeaderDigest CRC32C" 3965 " 0x%08x\n", checksum); 3966 } 3967 } 3968 3969 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3970 return; 3971 3972 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3973 3974 if (conn->sess->sess_ops->SessionType && 3975 ((!(opcode & ISCSI_OP_TEXT)) || 3976 (!(opcode & ISCSI_OP_LOGOUT)))) { 3977 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3978 " while in Discovery Session, rejecting.\n", opcode); 3979 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 3980 buffer); 3981 return; 3982 } 3983 3984 ret = iscsi_target_rx_opcode(conn, buffer); 3985 if (ret < 0) 3986 return; 3987 } 3988 } 3989 3990 int iscsi_target_rx_thread(void *arg) 3991 { 3992 int rc; 3993 struct iscsi_conn *conn = arg; 3994 bool conn_freed = false; 3995 3996 /* 3997 * Allow ourselves to be interrupted by SIGINT so that a 3998 * connection recovery / failure event can be triggered externally. 3999 */ 4000 allow_signal(SIGINT); 4001 /* 4002 * Wait for iscsi_post_login_handler() to complete before allowing 4003 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4004 */ 4005 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4006 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4007 goto out; 4008 4009 if (!conn->conn_transport->iscsit_get_rx_pdu) 4010 return 0; 4011 4012 conn->conn_transport->iscsit_get_rx_pdu(conn); 4013 4014 if (!signal_pending(current)) 4015 atomic_set(&conn->transport_failed, 1); 4016 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4017 4018 out: 4019 if (!conn_freed) { 4020 while (!kthread_should_stop()) { 4021 msleep(100); 4022 } 4023 } 4024 4025 return 0; 4026 } 4027 4028 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4029 { 4030 LIST_HEAD(tmp_list); 4031 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4032 struct iscsi_session *sess = conn->sess; 4033 /* 4034 * We expect this function to only ever be called from either RX or TX 4035 * thread context via iscsit_close_connection() once the other context 4036 * has been reset -> returned sleeping pre-handler state. 4037 */ 4038 spin_lock_bh(&conn->cmd_lock); 4039 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4040 4041 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4042 struct se_cmd *se_cmd = &cmd->se_cmd; 4043 4044 if (se_cmd->se_tfo != NULL) { 4045 spin_lock(&se_cmd->t_state_lock); 4046 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4047 spin_unlock(&se_cmd->t_state_lock); 4048 } 4049 } 4050 spin_unlock_bh(&conn->cmd_lock); 4051 4052 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4053 list_del_init(&cmd->i_conn_node); 4054 4055 iscsit_increment_maxcmdsn(cmd, sess); 4056 iscsit_free_cmd(cmd, true); 4057 4058 } 4059 } 4060 4061 static void iscsit_stop_timers_for_cmds( 4062 struct iscsi_conn *conn) 4063 { 4064 struct iscsi_cmd *cmd; 4065 4066 spin_lock_bh(&conn->cmd_lock); 4067 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4068 if (cmd->data_direction == DMA_TO_DEVICE) 4069 iscsit_stop_dataout_timer(cmd); 4070 } 4071 spin_unlock_bh(&conn->cmd_lock); 4072 } 4073 4074 int iscsit_close_connection( 4075 struct iscsi_conn *conn) 4076 { 4077 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4078 struct iscsi_session *sess = conn->sess; 4079 4080 pr_debug("Closing iSCSI connection CID %hu on SID:" 4081 " %u\n", conn->cid, sess->sid); 4082 /* 4083 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4084 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4085 * sleeping and the logout response never got sent because the 4086 * connection failed. 4087 * 4088 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4089 * to signal logout response TX interrupt completion. Go ahead and skip 4090 * this for iser since isert_rx_opcode() does not wait on logout failure, 4091 * and to avoid iscsi_conn pointer dereference in iser-target code. 4092 */ 4093 if (!conn->conn_transport->rdma_shutdown) 4094 complete(&conn->conn_logout_comp); 4095 4096 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4097 if (conn->tx_thread && 4098 cmpxchg(&conn->tx_thread_active, true, false)) { 4099 send_sig(SIGINT, conn->tx_thread, 1); 4100 kthread_stop(conn->tx_thread); 4101 } 4102 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4103 if (conn->rx_thread && 4104 cmpxchg(&conn->rx_thread_active, true, false)) { 4105 send_sig(SIGINT, conn->rx_thread, 1); 4106 kthread_stop(conn->rx_thread); 4107 } 4108 } 4109 4110 spin_lock(&iscsit_global->ts_bitmap_lock); 4111 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4112 get_order(1)); 4113 spin_unlock(&iscsit_global->ts_bitmap_lock); 4114 4115 iscsit_stop_timers_for_cmds(conn); 4116 iscsit_stop_nopin_response_timer(conn); 4117 iscsit_stop_nopin_timer(conn); 4118 4119 if (conn->conn_transport->iscsit_wait_conn) 4120 conn->conn_transport->iscsit_wait_conn(conn); 4121 4122 /* 4123 * During Connection recovery drop unacknowledged out of order 4124 * commands for this connection, and prepare the other commands 4125 * for reallegiance. 4126 * 4127 * During normal operation clear the out of order commands (but 4128 * do not free the struct iscsi_ooo_cmdsn's) and release all 4129 * struct iscsi_cmds. 4130 */ 4131 if (atomic_read(&conn->connection_recovery)) { 4132 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4133 iscsit_prepare_cmds_for_reallegiance(conn); 4134 } else { 4135 iscsit_clear_ooo_cmdsns_for_conn(conn); 4136 iscsit_release_commands_from_conn(conn); 4137 } 4138 iscsit_free_queue_reqs_for_conn(conn); 4139 4140 /* 4141 * Handle decrementing session or connection usage count if 4142 * a logout response was not able to be sent because the 4143 * connection failed. Fall back to Session Recovery here. 4144 */ 4145 if (atomic_read(&conn->conn_logout_remove)) { 4146 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4147 iscsit_dec_conn_usage_count(conn); 4148 iscsit_dec_session_usage_count(sess); 4149 } 4150 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4151 iscsit_dec_conn_usage_count(conn); 4152 4153 atomic_set(&conn->conn_logout_remove, 0); 4154 atomic_set(&sess->session_reinstatement, 0); 4155 atomic_set(&sess->session_fall_back_to_erl0, 1); 4156 } 4157 4158 spin_lock_bh(&sess->conn_lock); 4159 list_del(&conn->conn_list); 4160 4161 /* 4162 * Attempt to let the Initiator know this connection failed by 4163 * sending an Connection Dropped Async Message on another 4164 * active connection. 4165 */ 4166 if (atomic_read(&conn->connection_recovery)) 4167 iscsit_build_conn_drop_async_message(conn); 4168 4169 spin_unlock_bh(&sess->conn_lock); 4170 4171 /* 4172 * If connection reinstatement is being performed on this connection, 4173 * up the connection reinstatement semaphore that is being blocked on 4174 * in iscsit_cause_connection_reinstatement(). 4175 */ 4176 spin_lock_bh(&conn->state_lock); 4177 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4178 spin_unlock_bh(&conn->state_lock); 4179 complete(&conn->conn_wait_comp); 4180 wait_for_completion(&conn->conn_post_wait_comp); 4181 spin_lock_bh(&conn->state_lock); 4182 } 4183 4184 /* 4185 * If connection reinstatement is being performed on this connection 4186 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4187 * connection wait rcfr semaphore that is being blocked on 4188 * an iscsit_connection_reinstatement_rcfr(). 4189 */ 4190 if (atomic_read(&conn->connection_wait_rcfr)) { 4191 spin_unlock_bh(&conn->state_lock); 4192 complete(&conn->conn_wait_rcfr_comp); 4193 wait_for_completion(&conn->conn_post_wait_comp); 4194 spin_lock_bh(&conn->state_lock); 4195 } 4196 atomic_set(&conn->connection_reinstatement, 1); 4197 spin_unlock_bh(&conn->state_lock); 4198 4199 /* 4200 * If any other processes are accessing this connection pointer we 4201 * must wait until they have completed. 4202 */ 4203 iscsit_check_conn_usage_count(conn); 4204 4205 ahash_request_free(conn->conn_tx_hash); 4206 if (conn->conn_rx_hash) { 4207 struct crypto_ahash *tfm; 4208 4209 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4210 ahash_request_free(conn->conn_rx_hash); 4211 crypto_free_ahash(tfm); 4212 } 4213 4214 free_cpumask_var(conn->conn_cpumask); 4215 4216 kfree(conn->conn_ops); 4217 conn->conn_ops = NULL; 4218 4219 if (conn->sock) 4220 sock_release(conn->sock); 4221 4222 if (conn->conn_transport->iscsit_free_conn) 4223 conn->conn_transport->iscsit_free_conn(conn); 4224 4225 iscsit_put_transport(conn->conn_transport); 4226 4227 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4228 conn->conn_state = TARG_CONN_STATE_FREE; 4229 kfree(conn); 4230 4231 spin_lock_bh(&sess->conn_lock); 4232 atomic_dec(&sess->nconn); 4233 pr_debug("Decremented iSCSI connection count to %hu from node:" 4234 " %s\n", atomic_read(&sess->nconn), 4235 sess->sess_ops->InitiatorName); 4236 /* 4237 * Make sure that if one connection fails in an non ERL=2 iSCSI 4238 * Session that they all fail. 4239 */ 4240 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4241 !atomic_read(&sess->session_logout)) 4242 atomic_set(&sess->session_fall_back_to_erl0, 1); 4243 4244 /* 4245 * If this was not the last connection in the session, and we are 4246 * performing session reinstatement or falling back to ERL=0, call 4247 * iscsit_stop_session() without sleeping to shutdown the other 4248 * active connections. 4249 */ 4250 if (atomic_read(&sess->nconn)) { 4251 if (!atomic_read(&sess->session_reinstatement) && 4252 !atomic_read(&sess->session_fall_back_to_erl0)) { 4253 spin_unlock_bh(&sess->conn_lock); 4254 return 0; 4255 } 4256 if (!atomic_read(&sess->session_stop_active)) { 4257 atomic_set(&sess->session_stop_active, 1); 4258 spin_unlock_bh(&sess->conn_lock); 4259 iscsit_stop_session(sess, 0, 0); 4260 return 0; 4261 } 4262 spin_unlock_bh(&sess->conn_lock); 4263 return 0; 4264 } 4265 4266 /* 4267 * If this was the last connection in the session and one of the 4268 * following is occurring: 4269 * 4270 * Session Reinstatement is not being performed, and are falling back 4271 * to ERL=0 call iscsit_close_session(). 4272 * 4273 * Session Logout was requested. iscsit_close_session() will be called 4274 * elsewhere. 4275 * 4276 * Session Continuation is not being performed, start the Time2Retain 4277 * handler and check if sleep_on_sess_wait_sem is active. 4278 */ 4279 if (!atomic_read(&sess->session_reinstatement) && 4280 atomic_read(&sess->session_fall_back_to_erl0)) { 4281 spin_unlock_bh(&sess->conn_lock); 4282 iscsit_close_session(sess); 4283 4284 return 0; 4285 } else if (atomic_read(&sess->session_logout)) { 4286 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4287 sess->session_state = TARG_SESS_STATE_FREE; 4288 spin_unlock_bh(&sess->conn_lock); 4289 4290 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4291 complete(&sess->session_wait_comp); 4292 4293 return 0; 4294 } else { 4295 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4296 sess->session_state = TARG_SESS_STATE_FAILED; 4297 4298 if (!atomic_read(&sess->session_continuation)) { 4299 spin_unlock_bh(&sess->conn_lock); 4300 iscsit_start_time2retain_handler(sess); 4301 } else 4302 spin_unlock_bh(&sess->conn_lock); 4303 4304 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4305 complete(&sess->session_wait_comp); 4306 4307 return 0; 4308 } 4309 } 4310 4311 /* 4312 * If the iSCSI Session for the iSCSI Initiator Node exists, 4313 * forcefully shutdown the iSCSI NEXUS. 4314 */ 4315 int iscsit_close_session(struct iscsi_session *sess) 4316 { 4317 struct iscsi_portal_group *tpg = sess->tpg; 4318 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4319 4320 if (atomic_read(&sess->nconn)) { 4321 pr_err("%d connection(s) still exist for iSCSI session" 4322 " to %s\n", atomic_read(&sess->nconn), 4323 sess->sess_ops->InitiatorName); 4324 BUG(); 4325 } 4326 4327 spin_lock_bh(&se_tpg->session_lock); 4328 atomic_set(&sess->session_logout, 1); 4329 atomic_set(&sess->session_reinstatement, 1); 4330 iscsit_stop_time2retain_timer(sess); 4331 spin_unlock_bh(&se_tpg->session_lock); 4332 4333 /* 4334 * transport_deregister_session_configfs() will clear the 4335 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4336 * can be setting it again with __transport_register_session() in 4337 * iscsi_post_login_handler() again after the iscsit_stop_session() 4338 * completes in iscsi_np context. 4339 */ 4340 transport_deregister_session_configfs(sess->se_sess); 4341 4342 /* 4343 * If any other processes are accessing this session pointer we must 4344 * wait until they have completed. If we are in an interrupt (the 4345 * time2retain handler) and contain and active session usage count we 4346 * restart the timer and exit. 4347 */ 4348 if (!in_interrupt()) { 4349 if (iscsit_check_session_usage_count(sess) == 1) 4350 iscsit_stop_session(sess, 1, 1); 4351 } else { 4352 if (iscsit_check_session_usage_count(sess) == 2) { 4353 atomic_set(&sess->session_logout, 0); 4354 iscsit_start_time2retain_handler(sess); 4355 return 0; 4356 } 4357 } 4358 4359 transport_deregister_session(sess->se_sess); 4360 4361 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4362 iscsit_free_connection_recovery_entires(sess); 4363 4364 iscsit_free_all_ooo_cmdsns(sess); 4365 4366 spin_lock_bh(&se_tpg->session_lock); 4367 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4368 sess->session_state = TARG_SESS_STATE_FREE; 4369 pr_debug("Released iSCSI session from node: %s\n", 4370 sess->sess_ops->InitiatorName); 4371 tpg->nsessions--; 4372 if (tpg->tpg_tiqn) 4373 tpg->tpg_tiqn->tiqn_nsessions--; 4374 4375 pr_debug("Decremented number of active iSCSI Sessions on" 4376 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4377 4378 spin_lock(&sess_idr_lock); 4379 idr_remove(&sess_idr, sess->session_index); 4380 spin_unlock(&sess_idr_lock); 4381 4382 kfree(sess->sess_ops); 4383 sess->sess_ops = NULL; 4384 spin_unlock_bh(&se_tpg->session_lock); 4385 4386 kfree(sess); 4387 return 0; 4388 } 4389 4390 static void iscsit_logout_post_handler_closesession( 4391 struct iscsi_conn *conn) 4392 { 4393 struct iscsi_session *sess = conn->sess; 4394 int sleep = 1; 4395 /* 4396 * Traditional iscsi/tcp will invoke this logic from TX thread 4397 * context during session logout, so clear tx_thread_active and 4398 * sleep if iscsit_close_connection() has not already occured. 4399 * 4400 * Since iser-target invokes this logic from it's own workqueue, 4401 * always sleep waiting for RX/TX thread shutdown to complete 4402 * within iscsit_close_connection(). 4403 */ 4404 if (!conn->conn_transport->rdma_shutdown) { 4405 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4406 if (!sleep) 4407 return; 4408 } 4409 4410 atomic_set(&conn->conn_logout_remove, 0); 4411 complete(&conn->conn_logout_comp); 4412 4413 iscsit_dec_conn_usage_count(conn); 4414 iscsit_stop_session(sess, sleep, sleep); 4415 iscsit_dec_session_usage_count(sess); 4416 iscsit_close_session(sess); 4417 } 4418 4419 static void iscsit_logout_post_handler_samecid( 4420 struct iscsi_conn *conn) 4421 { 4422 int sleep = 1; 4423 4424 if (!conn->conn_transport->rdma_shutdown) { 4425 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4426 if (!sleep) 4427 return; 4428 } 4429 4430 atomic_set(&conn->conn_logout_remove, 0); 4431 complete(&conn->conn_logout_comp); 4432 4433 iscsit_cause_connection_reinstatement(conn, sleep); 4434 iscsit_dec_conn_usage_count(conn); 4435 } 4436 4437 static void iscsit_logout_post_handler_diffcid( 4438 struct iscsi_conn *conn, 4439 u16 cid) 4440 { 4441 struct iscsi_conn *l_conn; 4442 struct iscsi_session *sess = conn->sess; 4443 bool conn_found = false; 4444 4445 if (!sess) 4446 return; 4447 4448 spin_lock_bh(&sess->conn_lock); 4449 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4450 if (l_conn->cid == cid) { 4451 iscsit_inc_conn_usage_count(l_conn); 4452 conn_found = true; 4453 break; 4454 } 4455 } 4456 spin_unlock_bh(&sess->conn_lock); 4457 4458 if (!conn_found) 4459 return; 4460 4461 if (l_conn->sock) 4462 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4463 4464 spin_lock_bh(&l_conn->state_lock); 4465 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4466 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4467 spin_unlock_bh(&l_conn->state_lock); 4468 4469 iscsit_cause_connection_reinstatement(l_conn, 1); 4470 iscsit_dec_conn_usage_count(l_conn); 4471 } 4472 4473 /* 4474 * Return of 0 causes the TX thread to restart. 4475 */ 4476 int iscsit_logout_post_handler( 4477 struct iscsi_cmd *cmd, 4478 struct iscsi_conn *conn) 4479 { 4480 int ret = 0; 4481 4482 switch (cmd->logout_reason) { 4483 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4484 switch (cmd->logout_response) { 4485 case ISCSI_LOGOUT_SUCCESS: 4486 case ISCSI_LOGOUT_CLEANUP_FAILED: 4487 default: 4488 iscsit_logout_post_handler_closesession(conn); 4489 break; 4490 } 4491 ret = 0; 4492 break; 4493 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4494 if (conn->cid == cmd->logout_cid) { 4495 switch (cmd->logout_response) { 4496 case ISCSI_LOGOUT_SUCCESS: 4497 case ISCSI_LOGOUT_CLEANUP_FAILED: 4498 default: 4499 iscsit_logout_post_handler_samecid(conn); 4500 break; 4501 } 4502 ret = 0; 4503 } else { 4504 switch (cmd->logout_response) { 4505 case ISCSI_LOGOUT_SUCCESS: 4506 iscsit_logout_post_handler_diffcid(conn, 4507 cmd->logout_cid); 4508 break; 4509 case ISCSI_LOGOUT_CID_NOT_FOUND: 4510 case ISCSI_LOGOUT_CLEANUP_FAILED: 4511 default: 4512 break; 4513 } 4514 ret = 1; 4515 } 4516 break; 4517 case ISCSI_LOGOUT_REASON_RECOVERY: 4518 switch (cmd->logout_response) { 4519 case ISCSI_LOGOUT_SUCCESS: 4520 case ISCSI_LOGOUT_CID_NOT_FOUND: 4521 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4522 case ISCSI_LOGOUT_CLEANUP_FAILED: 4523 default: 4524 break; 4525 } 4526 ret = 1; 4527 break; 4528 default: 4529 break; 4530 4531 } 4532 return ret; 4533 } 4534 EXPORT_SYMBOL(iscsit_logout_post_handler); 4535 4536 void iscsit_fail_session(struct iscsi_session *sess) 4537 { 4538 struct iscsi_conn *conn; 4539 4540 spin_lock_bh(&sess->conn_lock); 4541 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4542 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4543 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4544 } 4545 spin_unlock_bh(&sess->conn_lock); 4546 4547 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4548 sess->session_state = TARG_SESS_STATE_FAILED; 4549 } 4550 4551 int iscsit_free_session(struct iscsi_session *sess) 4552 { 4553 u16 conn_count = atomic_read(&sess->nconn); 4554 struct iscsi_conn *conn, *conn_tmp = NULL; 4555 int is_last; 4556 4557 spin_lock_bh(&sess->conn_lock); 4558 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4559 4560 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4561 conn_list) { 4562 if (conn_count == 0) 4563 break; 4564 4565 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4566 is_last = 1; 4567 } else { 4568 iscsit_inc_conn_usage_count(conn_tmp); 4569 is_last = 0; 4570 } 4571 iscsit_inc_conn_usage_count(conn); 4572 4573 spin_unlock_bh(&sess->conn_lock); 4574 iscsit_cause_connection_reinstatement(conn, 1); 4575 spin_lock_bh(&sess->conn_lock); 4576 4577 iscsit_dec_conn_usage_count(conn); 4578 if (is_last == 0) 4579 iscsit_dec_conn_usage_count(conn_tmp); 4580 4581 conn_count--; 4582 } 4583 4584 if (atomic_read(&sess->nconn)) { 4585 spin_unlock_bh(&sess->conn_lock); 4586 wait_for_completion(&sess->session_wait_comp); 4587 } else 4588 spin_unlock_bh(&sess->conn_lock); 4589 4590 iscsit_close_session(sess); 4591 return 0; 4592 } 4593 4594 void iscsit_stop_session( 4595 struct iscsi_session *sess, 4596 int session_sleep, 4597 int connection_sleep) 4598 { 4599 u16 conn_count = atomic_read(&sess->nconn); 4600 struct iscsi_conn *conn, *conn_tmp = NULL; 4601 int is_last; 4602 4603 spin_lock_bh(&sess->conn_lock); 4604 if (session_sleep) 4605 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4606 4607 if (connection_sleep) { 4608 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4609 conn_list) { 4610 if (conn_count == 0) 4611 break; 4612 4613 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4614 is_last = 1; 4615 } else { 4616 iscsit_inc_conn_usage_count(conn_tmp); 4617 is_last = 0; 4618 } 4619 iscsit_inc_conn_usage_count(conn); 4620 4621 spin_unlock_bh(&sess->conn_lock); 4622 iscsit_cause_connection_reinstatement(conn, 1); 4623 spin_lock_bh(&sess->conn_lock); 4624 4625 iscsit_dec_conn_usage_count(conn); 4626 if (is_last == 0) 4627 iscsit_dec_conn_usage_count(conn_tmp); 4628 conn_count--; 4629 } 4630 } else { 4631 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4632 iscsit_cause_connection_reinstatement(conn, 0); 4633 } 4634 4635 if (session_sleep && atomic_read(&sess->nconn)) { 4636 spin_unlock_bh(&sess->conn_lock); 4637 wait_for_completion(&sess->session_wait_comp); 4638 } else 4639 spin_unlock_bh(&sess->conn_lock); 4640 } 4641 4642 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4643 { 4644 struct iscsi_session *sess; 4645 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4646 struct se_session *se_sess, *se_sess_tmp; 4647 LIST_HEAD(free_list); 4648 int session_count = 0; 4649 4650 spin_lock_bh(&se_tpg->session_lock); 4651 if (tpg->nsessions && !force) { 4652 spin_unlock_bh(&se_tpg->session_lock); 4653 return -1; 4654 } 4655 4656 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4657 sess_list) { 4658 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4659 4660 spin_lock(&sess->conn_lock); 4661 if (atomic_read(&sess->session_fall_back_to_erl0) || 4662 atomic_read(&sess->session_logout) || 4663 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4664 spin_unlock(&sess->conn_lock); 4665 continue; 4666 } 4667 atomic_set(&sess->session_reinstatement, 1); 4668 atomic_set(&sess->session_fall_back_to_erl0, 1); 4669 spin_unlock(&sess->conn_lock); 4670 4671 list_move_tail(&se_sess->sess_list, &free_list); 4672 } 4673 spin_unlock_bh(&se_tpg->session_lock); 4674 4675 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4676 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4677 4678 iscsit_free_session(sess); 4679 session_count++; 4680 } 4681 4682 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4683 " Group: %hu\n", session_count, tpg->tpgt); 4684 return 0; 4685 } 4686 4687 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4688 MODULE_VERSION("4.1.x"); 4689 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4690 MODULE_LICENSE("GPL"); 4691 4692 module_init(iscsi_target_init_module); 4693 module_exit(iscsi_target_cleanup_module); 4694