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 <net/ipv6.h> 30 #include <scsi/scsi_proto.h> 31 #include <scsi/iscsi_proto.h> 32 #include <scsi/scsi_tcq.h> 33 #include <target/target_core_base.h> 34 #include <target/target_core_fabric.h> 35 36 #include <target/iscsi/iscsi_target_core.h> 37 #include "iscsi_target_parameters.h" 38 #include "iscsi_target_seq_pdu_list.h" 39 #include "iscsi_target_datain_values.h" 40 #include "iscsi_target_erl0.h" 41 #include "iscsi_target_erl1.h" 42 #include "iscsi_target_erl2.h" 43 #include "iscsi_target_login.h" 44 #include "iscsi_target_tmr.h" 45 #include "iscsi_target_tpg.h" 46 #include "iscsi_target_util.h" 47 #include "iscsi_target.h" 48 #include "iscsi_target_device.h" 49 #include <target/iscsi/iscsi_target_stat.h> 50 51 #include <target/iscsi/iscsi_transport.h> 52 53 static LIST_HEAD(g_tiqn_list); 54 static LIST_HEAD(g_np_list); 55 static DEFINE_SPINLOCK(tiqn_lock); 56 static DEFINE_MUTEX(np_lock); 57 58 static struct idr tiqn_idr; 59 struct idr sess_idr; 60 struct mutex auth_id_lock; 61 spinlock_t sess_idr_lock; 62 63 struct iscsit_global *iscsit_global; 64 65 struct kmem_cache *lio_qr_cache; 66 struct kmem_cache *lio_dr_cache; 67 struct kmem_cache *lio_ooo_cache; 68 struct kmem_cache *lio_r2t_cache; 69 70 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 71 struct iscsi_scsi_req *, u32); 72 73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 74 { 75 struct iscsi_tiqn *tiqn = NULL; 76 77 spin_lock(&tiqn_lock); 78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 79 if (!strcmp(tiqn->tiqn, buf)) { 80 81 spin_lock(&tiqn->tiqn_state_lock); 82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 83 tiqn->tiqn_access_count++; 84 spin_unlock(&tiqn->tiqn_state_lock); 85 spin_unlock(&tiqn_lock); 86 return tiqn; 87 } 88 spin_unlock(&tiqn->tiqn_state_lock); 89 } 90 } 91 spin_unlock(&tiqn_lock); 92 93 return NULL; 94 } 95 96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 97 { 98 spin_lock(&tiqn->tiqn_state_lock); 99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 101 spin_unlock(&tiqn->tiqn_state_lock); 102 return 0; 103 } 104 spin_unlock(&tiqn->tiqn_state_lock); 105 106 return -1; 107 } 108 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 110 { 111 spin_lock(&tiqn->tiqn_state_lock); 112 tiqn->tiqn_access_count--; 113 spin_unlock(&tiqn->tiqn_state_lock); 114 } 115 116 /* 117 * Note that IQN formatting is expected to be done in userspace, and 118 * no explict IQN format checks are done here. 119 */ 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 121 { 122 struct iscsi_tiqn *tiqn = NULL; 123 int ret; 124 125 if (strlen(buf) >= ISCSI_IQN_LEN) { 126 pr_err("Target IQN exceeds %d bytes\n", 127 ISCSI_IQN_LEN); 128 return ERR_PTR(-EINVAL); 129 } 130 131 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); 132 if (!tiqn) 133 return ERR_PTR(-ENOMEM); 134 135 sprintf(tiqn->tiqn, "%s", buf); 136 INIT_LIST_HEAD(&tiqn->tiqn_list); 137 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 138 spin_lock_init(&tiqn->tiqn_state_lock); 139 spin_lock_init(&tiqn->tiqn_tpg_lock); 140 spin_lock_init(&tiqn->sess_err_stats.lock); 141 spin_lock_init(&tiqn->login_stats.lock); 142 spin_lock_init(&tiqn->logout_stats.lock); 143 144 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 145 146 idr_preload(GFP_KERNEL); 147 spin_lock(&tiqn_lock); 148 149 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 150 if (ret < 0) { 151 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 152 spin_unlock(&tiqn_lock); 153 idr_preload_end(); 154 kfree(tiqn); 155 return ERR_PTR(ret); 156 } 157 tiqn->tiqn_index = ret; 158 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 159 160 spin_unlock(&tiqn_lock); 161 idr_preload_end(); 162 163 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 164 165 return tiqn; 166 167 } 168 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 170 { 171 /* 172 * Wait for accesses to said struct iscsi_tiqn to end. 173 */ 174 spin_lock(&tiqn->tiqn_state_lock); 175 while (tiqn->tiqn_access_count != 0) { 176 spin_unlock(&tiqn->tiqn_state_lock); 177 msleep(10); 178 spin_lock(&tiqn->tiqn_state_lock); 179 } 180 spin_unlock(&tiqn->tiqn_state_lock); 181 } 182 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 184 { 185 /* 186 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 187 * while holding tiqn->tiqn_state_lock. This means that all subsequent 188 * attempts to access this struct iscsi_tiqn will fail from both transport 189 * fabric and control code paths. 190 */ 191 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 192 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 193 return; 194 } 195 196 iscsit_wait_for_tiqn(tiqn); 197 198 spin_lock(&tiqn_lock); 199 list_del(&tiqn->tiqn_list); 200 idr_remove(&tiqn_idr, tiqn->tiqn_index); 201 spin_unlock(&tiqn_lock); 202 203 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 204 tiqn->tiqn); 205 kfree(tiqn); 206 } 207 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 209 { 210 int ret; 211 /* 212 * Determine if the network portal is accepting storage traffic. 213 */ 214 spin_lock_bh(&np->np_thread_lock); 215 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 216 spin_unlock_bh(&np->np_thread_lock); 217 return -1; 218 } 219 spin_unlock_bh(&np->np_thread_lock); 220 /* 221 * Determine if the portal group is accepting storage traffic. 222 */ 223 spin_lock_bh(&tpg->tpg_state_lock); 224 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 225 spin_unlock_bh(&tpg->tpg_state_lock); 226 return -1; 227 } 228 spin_unlock_bh(&tpg->tpg_state_lock); 229 230 /* 231 * Here we serialize access across the TIQN+TPG Tuple. 232 */ 233 ret = down_interruptible(&tpg->np_login_sem); 234 if (ret != 0) 235 return -1; 236 237 spin_lock_bh(&tpg->tpg_state_lock); 238 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 239 spin_unlock_bh(&tpg->tpg_state_lock); 240 up(&tpg->np_login_sem); 241 return -1; 242 } 243 spin_unlock_bh(&tpg->tpg_state_lock); 244 245 return 0; 246 } 247 248 void iscsit_login_kref_put(struct kref *kref) 249 { 250 struct iscsi_tpg_np *tpg_np = container_of(kref, 251 struct iscsi_tpg_np, tpg_np_kref); 252 253 complete(&tpg_np->tpg_np_comp); 254 } 255 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 257 struct iscsi_tpg_np *tpg_np) 258 { 259 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 260 261 up(&tpg->np_login_sem); 262 263 if (tpg_np) 264 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 265 266 if (tiqn) 267 iscsit_put_tiqn_for_login(tiqn); 268 269 return 0; 270 } 271 272 bool iscsit_check_np_match( 273 struct sockaddr_storage *sockaddr, 274 struct iscsi_np *np, 275 int network_transport) 276 { 277 struct sockaddr_in *sock_in, *sock_in_e; 278 struct sockaddr_in6 *sock_in6, *sock_in6_e; 279 bool ip_match = false; 280 u16 port, port_e; 281 282 if (sockaddr->ss_family == AF_INET6) { 283 sock_in6 = (struct sockaddr_in6 *)sockaddr; 284 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 285 286 if (!memcmp(&sock_in6->sin6_addr.in6_u, 287 &sock_in6_e->sin6_addr.in6_u, 288 sizeof(struct in6_addr))) 289 ip_match = true; 290 291 port = ntohs(sock_in6->sin6_port); 292 port_e = ntohs(sock_in6_e->sin6_port); 293 } else { 294 sock_in = (struct sockaddr_in *)sockaddr; 295 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 296 297 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 298 ip_match = true; 299 300 port = ntohs(sock_in->sin_port); 301 port_e = ntohs(sock_in_e->sin_port); 302 } 303 304 if (ip_match && (port_e == port) && 305 (np->np_network_transport == network_transport)) 306 return true; 307 308 return false; 309 } 310 311 /* 312 * Called with mutex np_lock held 313 */ 314 static struct iscsi_np *iscsit_get_np( 315 struct sockaddr_storage *sockaddr, 316 int network_transport) 317 { 318 struct iscsi_np *np; 319 bool match; 320 321 list_for_each_entry(np, &g_np_list, np_list) { 322 spin_lock_bh(&np->np_thread_lock); 323 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 324 spin_unlock_bh(&np->np_thread_lock); 325 continue; 326 } 327 328 match = iscsit_check_np_match(sockaddr, np, network_transport); 329 if (match) { 330 /* 331 * Increment the np_exports reference count now to 332 * prevent iscsit_del_np() below from being called 333 * while iscsi_tpg_add_network_portal() is called. 334 */ 335 np->np_exports++; 336 spin_unlock_bh(&np->np_thread_lock); 337 return np; 338 } 339 spin_unlock_bh(&np->np_thread_lock); 340 } 341 342 return NULL; 343 } 344 345 struct iscsi_np *iscsit_add_np( 346 struct sockaddr_storage *sockaddr, 347 int network_transport) 348 { 349 struct iscsi_np *np; 350 int ret; 351 352 mutex_lock(&np_lock); 353 354 /* 355 * Locate the existing struct iscsi_np if already active.. 356 */ 357 np = iscsit_get_np(sockaddr, network_transport); 358 if (np) { 359 mutex_unlock(&np_lock); 360 return np; 361 } 362 363 np = kzalloc(sizeof(*np), GFP_KERNEL); 364 if (!np) { 365 mutex_unlock(&np_lock); 366 return ERR_PTR(-ENOMEM); 367 } 368 369 np->np_flags |= NPF_IP_NETWORK; 370 np->np_network_transport = network_transport; 371 spin_lock_init(&np->np_thread_lock); 372 init_completion(&np->np_restart_comp); 373 INIT_LIST_HEAD(&np->np_list); 374 375 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0); 376 377 ret = iscsi_target_setup_login_socket(np, sockaddr); 378 if (ret != 0) { 379 kfree(np); 380 mutex_unlock(&np_lock); 381 return ERR_PTR(ret); 382 } 383 384 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 385 if (IS_ERR(np->np_thread)) { 386 pr_err("Unable to create kthread: iscsi_np\n"); 387 ret = PTR_ERR(np->np_thread); 388 kfree(np); 389 mutex_unlock(&np_lock); 390 return ERR_PTR(ret); 391 } 392 /* 393 * Increment the np_exports reference count now to prevent 394 * iscsit_del_np() below from being run while a new call to 395 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 396 * active. We don't need to hold np->np_thread_lock at this 397 * point because iscsi_np has not been added to g_np_list yet. 398 */ 399 np->np_exports = 1; 400 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 401 402 list_add_tail(&np->np_list, &g_np_list); 403 mutex_unlock(&np_lock); 404 405 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 406 &np->np_sockaddr, np->np_transport->name); 407 408 return np; 409 } 410 411 int iscsit_reset_np_thread( 412 struct iscsi_np *np, 413 struct iscsi_tpg_np *tpg_np, 414 struct iscsi_portal_group *tpg, 415 bool shutdown) 416 { 417 spin_lock_bh(&np->np_thread_lock); 418 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 419 spin_unlock_bh(&np->np_thread_lock); 420 return 0; 421 } 422 np->np_thread_state = ISCSI_NP_THREAD_RESET; 423 atomic_inc(&np->np_reset_count); 424 425 if (np->np_thread) { 426 spin_unlock_bh(&np->np_thread_lock); 427 send_sig(SIGINT, np->np_thread, 1); 428 wait_for_completion(&np->np_restart_comp); 429 spin_lock_bh(&np->np_thread_lock); 430 } 431 spin_unlock_bh(&np->np_thread_lock); 432 433 if (tpg_np && shutdown) { 434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 435 436 wait_for_completion(&tpg_np->tpg_np_comp); 437 } 438 439 return 0; 440 } 441 442 static void iscsit_free_np(struct iscsi_np *np) 443 { 444 if (np->np_socket) 445 sock_release(np->np_socket); 446 } 447 448 int iscsit_del_np(struct iscsi_np *np) 449 { 450 spin_lock_bh(&np->np_thread_lock); 451 np->np_exports--; 452 if (np->np_exports) { 453 np->enabled = true; 454 spin_unlock_bh(&np->np_thread_lock); 455 return 0; 456 } 457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 458 spin_unlock_bh(&np->np_thread_lock); 459 460 if (np->np_thread) { 461 /* 462 * We need to send the signal to wakeup Linux/Net 463 * which may be sleeping in sock_accept().. 464 */ 465 send_sig(SIGINT, np->np_thread, 1); 466 kthread_stop(np->np_thread); 467 np->np_thread = NULL; 468 } 469 470 np->np_transport->iscsit_free_np(np); 471 472 mutex_lock(&np_lock); 473 list_del(&np->np_list); 474 mutex_unlock(&np_lock); 475 476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 477 &np->np_sockaddr, np->np_transport->name); 478 479 iscsit_put_transport(np->np_transport); 480 kfree(np); 481 return 0; 482 } 483 484 static void iscsit_get_rx_pdu(struct iscsi_conn *); 485 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 487 { 488 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 489 } 490 EXPORT_SYMBOL(iscsit_queue_rsp); 491 492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 493 { 494 spin_lock_bh(&conn->cmd_lock); 495 if (!list_empty(&cmd->i_conn_node) && 496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 497 list_del_init(&cmd->i_conn_node); 498 spin_unlock_bh(&conn->cmd_lock); 499 500 __iscsit_free_cmd(cmd, true); 501 } 502 EXPORT_SYMBOL(iscsit_aborted_task); 503 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 505 u32, u32, const void *, void *); 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 507 508 static int 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 510 const void *data_buf, u32 data_buf_len) 511 { 512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 513 struct kvec *iov; 514 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 515 int ret; 516 517 iov = &cmd->iov_misc[0]; 518 iov[niov].iov_base = cmd->pdu; 519 iov[niov++].iov_len = ISCSI_HDR_LEN; 520 521 if (conn->conn_ops->HeaderDigest) { 522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 523 524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 525 ISCSI_HDR_LEN, 0, NULL, 526 header_digest); 527 528 iov[0].iov_len += ISCSI_CRC_LEN; 529 tx_size += ISCSI_CRC_LEN; 530 pr_debug("Attaching CRC32C HeaderDigest" 531 " to opcode 0x%x 0x%08x\n", 532 hdr->opcode, *header_digest); 533 } 534 535 if (data_buf_len) { 536 u32 padding = ((-data_buf_len) & 3); 537 538 iov[niov].iov_base = (void *)data_buf; 539 iov[niov++].iov_len = data_buf_len; 540 tx_size += data_buf_len; 541 542 if (padding != 0) { 543 iov[niov].iov_base = &cmd->pad_bytes; 544 iov[niov++].iov_len = padding; 545 tx_size += padding; 546 pr_debug("Attaching %u additional" 547 " padding bytes.\n", padding); 548 } 549 550 if (conn->conn_ops->DataDigest) { 551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 552 data_buf, data_buf_len, 553 padding, &cmd->pad_bytes, 554 &cmd->data_crc); 555 556 iov[niov].iov_base = &cmd->data_crc; 557 iov[niov++].iov_len = ISCSI_CRC_LEN; 558 tx_size += ISCSI_CRC_LEN; 559 pr_debug("Attached DataDigest for %u" 560 " bytes opcode 0x%x, CRC 0x%08x\n", 561 data_buf_len, hdr->opcode, cmd->data_crc); 562 } 563 } 564 565 cmd->iov_misc_count = niov; 566 cmd->tx_size = tx_size; 567 568 ret = iscsit_send_tx_data(cmd, conn, 1); 569 if (ret < 0) { 570 iscsit_tx_thread_wait_for_tcp(conn); 571 return ret; 572 } 573 574 return 0; 575 } 576 577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 578 static void iscsit_unmap_iovec(struct iscsi_cmd *); 579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 580 u32, u32, u32, u8 *); 581 static int 582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 583 const struct iscsi_datain *datain) 584 { 585 struct kvec *iov; 586 u32 iov_count = 0, tx_size = 0; 587 int ret, iov_ret; 588 589 iov = &cmd->iov_data[0]; 590 iov[iov_count].iov_base = cmd->pdu; 591 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 592 tx_size += ISCSI_HDR_LEN; 593 594 if (conn->conn_ops->HeaderDigest) { 595 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 596 597 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 598 ISCSI_HDR_LEN, 0, NULL, 599 header_digest); 600 601 iov[0].iov_len += ISCSI_CRC_LEN; 602 tx_size += ISCSI_CRC_LEN; 603 604 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 605 *header_digest); 606 } 607 608 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 609 datain->offset, datain->length); 610 if (iov_ret < 0) 611 return -1; 612 613 iov_count += iov_ret; 614 tx_size += datain->length; 615 616 cmd->padding = ((-datain->length) & 3); 617 if (cmd->padding) { 618 iov[iov_count].iov_base = cmd->pad_bytes; 619 iov[iov_count++].iov_len = cmd->padding; 620 tx_size += cmd->padding; 621 622 pr_debug("Attaching %u padding bytes\n", cmd->padding); 623 } 624 625 if (conn->conn_ops->DataDigest) { 626 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 627 cmd, datain->offset, 628 datain->length, 629 cmd->padding, 630 cmd->pad_bytes); 631 632 iov[iov_count].iov_base = &cmd->data_crc; 633 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 634 tx_size += ISCSI_CRC_LEN; 635 636 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 637 datain->length + cmd->padding, cmd->data_crc); 638 } 639 640 cmd->iov_data_count = iov_count; 641 cmd->tx_size = tx_size; 642 643 ret = iscsit_fe_sendpage_sg(cmd, conn); 644 645 iscsit_unmap_iovec(cmd); 646 647 if (ret < 0) { 648 iscsit_tx_thread_wait_for_tcp(conn); 649 return ret; 650 } 651 652 return 0; 653 } 654 655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 656 struct iscsi_datain_req *dr, const void *buf, 657 u32 buf_len) 658 { 659 if (dr) 660 return iscsit_xmit_datain_pdu(conn, cmd, buf); 661 else 662 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 663 } 664 665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 666 { 667 return TARGET_PROT_NORMAL; 668 } 669 670 static struct iscsit_transport iscsi_target_transport = { 671 .name = "iSCSI/TCP", 672 .transport_type = ISCSI_TCP, 673 .rdma_shutdown = false, 674 .owner = NULL, 675 .iscsit_setup_np = iscsit_setup_np, 676 .iscsit_accept_np = iscsit_accept_np, 677 .iscsit_free_np = iscsit_free_np, 678 .iscsit_get_login_rx = iscsit_get_login_rx, 679 .iscsit_put_login_tx = iscsit_put_login_tx, 680 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 681 .iscsit_immediate_queue = iscsit_immediate_queue, 682 .iscsit_response_queue = iscsit_response_queue, 683 .iscsit_queue_data_in = iscsit_queue_rsp, 684 .iscsit_queue_status = iscsit_queue_rsp, 685 .iscsit_aborted_task = iscsit_aborted_task, 686 .iscsit_xmit_pdu = iscsit_xmit_pdu, 687 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 688 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 689 }; 690 691 static int __init iscsi_target_init_module(void) 692 { 693 int ret = 0, size; 694 695 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 696 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 697 if (!iscsit_global) 698 return -1; 699 700 spin_lock_init(&iscsit_global->ts_bitmap_lock); 701 mutex_init(&auth_id_lock); 702 spin_lock_init(&sess_idr_lock); 703 idr_init(&tiqn_idr); 704 idr_init(&sess_idr); 705 706 ret = target_register_template(&iscsi_ops); 707 if (ret) 708 goto out; 709 710 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 711 iscsit_global->ts_bitmap = vzalloc(size); 712 if (!iscsit_global->ts_bitmap) 713 goto configfs_out; 714 715 lio_qr_cache = kmem_cache_create("lio_qr_cache", 716 sizeof(struct iscsi_queue_req), 717 __alignof__(struct iscsi_queue_req), 0, NULL); 718 if (!lio_qr_cache) { 719 pr_err("nable to kmem_cache_create() for" 720 " lio_qr_cache\n"); 721 goto bitmap_out; 722 } 723 724 lio_dr_cache = kmem_cache_create("lio_dr_cache", 725 sizeof(struct iscsi_datain_req), 726 __alignof__(struct iscsi_datain_req), 0, NULL); 727 if (!lio_dr_cache) { 728 pr_err("Unable to kmem_cache_create() for" 729 " lio_dr_cache\n"); 730 goto qr_out; 731 } 732 733 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 734 sizeof(struct iscsi_ooo_cmdsn), 735 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 736 if (!lio_ooo_cache) { 737 pr_err("Unable to kmem_cache_create() for" 738 " lio_ooo_cache\n"); 739 goto dr_out; 740 } 741 742 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 743 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 744 0, NULL); 745 if (!lio_r2t_cache) { 746 pr_err("Unable to kmem_cache_create() for" 747 " lio_r2t_cache\n"); 748 goto ooo_out; 749 } 750 751 iscsit_register_transport(&iscsi_target_transport); 752 753 if (iscsit_load_discovery_tpg() < 0) 754 goto r2t_out; 755 756 return ret; 757 r2t_out: 758 iscsit_unregister_transport(&iscsi_target_transport); 759 kmem_cache_destroy(lio_r2t_cache); 760 ooo_out: 761 kmem_cache_destroy(lio_ooo_cache); 762 dr_out: 763 kmem_cache_destroy(lio_dr_cache); 764 qr_out: 765 kmem_cache_destroy(lio_qr_cache); 766 bitmap_out: 767 vfree(iscsit_global->ts_bitmap); 768 configfs_out: 769 /* XXX: this probably wants it to be it's own unwind step.. */ 770 if (iscsit_global->discovery_tpg) 771 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 772 target_unregister_template(&iscsi_ops); 773 out: 774 kfree(iscsit_global); 775 return -ENOMEM; 776 } 777 778 static void __exit iscsi_target_cleanup_module(void) 779 { 780 iscsit_release_discovery_tpg(); 781 iscsit_unregister_transport(&iscsi_target_transport); 782 kmem_cache_destroy(lio_qr_cache); 783 kmem_cache_destroy(lio_dr_cache); 784 kmem_cache_destroy(lio_ooo_cache); 785 kmem_cache_destroy(lio_r2t_cache); 786 787 /* 788 * Shutdown discovery sessions and disable discovery TPG 789 */ 790 if (iscsit_global->discovery_tpg) 791 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 792 793 target_unregister_template(&iscsi_ops); 794 795 vfree(iscsit_global->ts_bitmap); 796 kfree(iscsit_global); 797 } 798 799 int iscsit_add_reject( 800 struct iscsi_conn *conn, 801 u8 reason, 802 unsigned char *buf) 803 { 804 struct iscsi_cmd *cmd; 805 806 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 807 if (!cmd) 808 return -1; 809 810 cmd->iscsi_opcode = ISCSI_OP_REJECT; 811 cmd->reject_reason = reason; 812 813 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 814 if (!cmd->buf_ptr) { 815 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 816 iscsit_free_cmd(cmd, false); 817 return -1; 818 } 819 820 spin_lock_bh(&conn->cmd_lock); 821 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 822 spin_unlock_bh(&conn->cmd_lock); 823 824 cmd->i_state = ISTATE_SEND_REJECT; 825 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 826 827 return -1; 828 } 829 EXPORT_SYMBOL(iscsit_add_reject); 830 831 static int iscsit_add_reject_from_cmd( 832 struct iscsi_cmd *cmd, 833 u8 reason, 834 bool add_to_conn, 835 unsigned char *buf) 836 { 837 struct iscsi_conn *conn; 838 const bool do_put = cmd->se_cmd.se_tfo != NULL; 839 840 if (!cmd->conn) { 841 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 842 cmd->init_task_tag); 843 return -1; 844 } 845 conn = cmd->conn; 846 847 cmd->iscsi_opcode = ISCSI_OP_REJECT; 848 cmd->reject_reason = reason; 849 850 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 851 if (!cmd->buf_ptr) { 852 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 853 iscsit_free_cmd(cmd, false); 854 return -1; 855 } 856 857 if (add_to_conn) { 858 spin_lock_bh(&conn->cmd_lock); 859 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 860 spin_unlock_bh(&conn->cmd_lock); 861 } 862 863 cmd->i_state = ISTATE_SEND_REJECT; 864 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 865 /* 866 * Perform the kref_put now if se_cmd has already been setup by 867 * scsit_setup_scsi_cmd() 868 */ 869 if (do_put) { 870 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 871 target_put_sess_cmd(&cmd->se_cmd); 872 } 873 return -1; 874 } 875 876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 877 unsigned char *buf) 878 { 879 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 880 } 881 882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 883 { 884 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 885 } 886 EXPORT_SYMBOL(iscsit_reject_cmd); 887 888 /* 889 * Map some portion of the allocated scatterlist to an iovec, suitable for 890 * kernel sockets to copy data in/out. 891 */ 892 static int iscsit_map_iovec( 893 struct iscsi_cmd *cmd, 894 struct kvec *iov, 895 u32 data_offset, 896 u32 data_length) 897 { 898 u32 i = 0; 899 struct scatterlist *sg; 900 unsigned int page_off; 901 902 /* 903 * We know each entry in t_data_sg contains a page. 904 */ 905 u32 ent = data_offset / PAGE_SIZE; 906 907 if (ent >= cmd->se_cmd.t_data_nents) { 908 pr_err("Initial page entry out-of-bounds\n"); 909 return -1; 910 } 911 912 sg = &cmd->se_cmd.t_data_sg[ent]; 913 page_off = (data_offset % PAGE_SIZE); 914 915 cmd->first_data_sg = sg; 916 cmd->first_data_sg_off = page_off; 917 918 while (data_length) { 919 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 920 921 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 922 iov[i].iov_len = cur_len; 923 924 data_length -= cur_len; 925 page_off = 0; 926 sg = sg_next(sg); 927 i++; 928 } 929 930 cmd->kmapped_nents = i; 931 932 return i; 933 } 934 935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 936 { 937 u32 i; 938 struct scatterlist *sg; 939 940 sg = cmd->first_data_sg; 941 942 for (i = 0; i < cmd->kmapped_nents; i++) 943 kunmap(sg_page(&sg[i])); 944 } 945 946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 947 { 948 LIST_HEAD(ack_list); 949 struct iscsi_cmd *cmd, *cmd_p; 950 951 conn->exp_statsn = exp_statsn; 952 953 if (conn->sess->sess_ops->RDMAExtensions) 954 return; 955 956 spin_lock_bh(&conn->cmd_lock); 957 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 958 spin_lock(&cmd->istate_lock); 959 if ((cmd->i_state == ISTATE_SENT_STATUS) && 960 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 961 cmd->i_state = ISTATE_REMOVE; 962 spin_unlock(&cmd->istate_lock); 963 list_move_tail(&cmd->i_conn_node, &ack_list); 964 continue; 965 } 966 spin_unlock(&cmd->istate_lock); 967 } 968 spin_unlock_bh(&conn->cmd_lock); 969 970 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 971 list_del_init(&cmd->i_conn_node); 972 iscsit_free_cmd(cmd, false); 973 } 974 } 975 976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 977 { 978 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 979 980 iov_count += ISCSI_IOV_DATA_BUFFER; 981 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 982 if (!cmd->iov_data) 983 return -ENOMEM; 984 985 cmd->orig_iov_data_count = iov_count; 986 return 0; 987 } 988 989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 990 unsigned char *buf) 991 { 992 int data_direction, payload_length; 993 struct iscsi_scsi_req *hdr; 994 int iscsi_task_attr; 995 int sam_task_attr; 996 997 atomic_long_inc(&conn->sess->cmd_pdus); 998 999 hdr = (struct iscsi_scsi_req *) buf; 1000 payload_length = ntoh24(hdr->dlength); 1001 1002 /* FIXME; Add checks for AdditionalHeaderSegment */ 1003 1004 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1005 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1006 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1007 " not set. Bad iSCSI Initiator.\n"); 1008 return iscsit_add_reject_cmd(cmd, 1009 ISCSI_REASON_BOOKMARK_INVALID, buf); 1010 } 1011 1012 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1013 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1014 /* 1015 * From RFC-3720 Section 10.3.1: 1016 * 1017 * "Either or both of R and W MAY be 1 when either the 1018 * Expected Data Transfer Length and/or Bidirectional Read 1019 * Expected Data Transfer Length are 0" 1020 * 1021 * For this case, go ahead and clear the unnecssary bits 1022 * to avoid any confusion with ->data_direction. 1023 */ 1024 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1025 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1026 1027 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1028 " set when Expected Data Transfer Length is 0 for" 1029 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1030 } 1031 1032 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1033 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1034 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1035 " MUST be set if Expected Data Transfer Length is not 0." 1036 " Bad iSCSI Initiator\n"); 1037 return iscsit_add_reject_cmd(cmd, 1038 ISCSI_REASON_BOOKMARK_INVALID, buf); 1039 } 1040 1041 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1042 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1043 pr_err("Bidirectional operations not supported!\n"); 1044 return iscsit_add_reject_cmd(cmd, 1045 ISCSI_REASON_BOOKMARK_INVALID, buf); 1046 } 1047 1048 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1049 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1050 " Scsi Command PDU.\n"); 1051 return iscsit_add_reject_cmd(cmd, 1052 ISCSI_REASON_BOOKMARK_INVALID, buf); 1053 } 1054 1055 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1056 pr_err("ImmediateData=No but DataSegmentLength=%u," 1057 " protocol error.\n", payload_length); 1058 return iscsit_add_reject_cmd(cmd, 1059 ISCSI_REASON_PROTOCOL_ERROR, buf); 1060 } 1061 1062 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1063 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1064 pr_err("Expected Data Transfer Length and Length of" 1065 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1066 " bit is not set protocol error\n"); 1067 return iscsit_add_reject_cmd(cmd, 1068 ISCSI_REASON_PROTOCOL_ERROR, buf); 1069 } 1070 1071 if (payload_length > be32_to_cpu(hdr->data_length)) { 1072 pr_err("DataSegmentLength: %u is greater than" 1073 " EDTL: %u, protocol error.\n", payload_length, 1074 hdr->data_length); 1075 return iscsit_add_reject_cmd(cmd, 1076 ISCSI_REASON_PROTOCOL_ERROR, buf); 1077 } 1078 1079 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1080 pr_err("DataSegmentLength: %u is greater than" 1081 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1082 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1083 return iscsit_add_reject_cmd(cmd, 1084 ISCSI_REASON_PROTOCOL_ERROR, buf); 1085 } 1086 1087 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1088 pr_err("DataSegmentLength: %u is greater than" 1089 " FirstBurstLength: %u, protocol error.\n", 1090 payload_length, conn->sess->sess_ops->FirstBurstLength); 1091 return iscsit_add_reject_cmd(cmd, 1092 ISCSI_REASON_BOOKMARK_INVALID, buf); 1093 } 1094 1095 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1096 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1097 DMA_NONE; 1098 1099 cmd->data_direction = data_direction; 1100 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1101 /* 1102 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1103 */ 1104 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1105 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1106 sam_task_attr = TCM_SIMPLE_TAG; 1107 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1108 sam_task_attr = TCM_ORDERED_TAG; 1109 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1110 sam_task_attr = TCM_HEAD_TAG; 1111 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1112 sam_task_attr = TCM_ACA_TAG; 1113 else { 1114 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1115 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1116 sam_task_attr = TCM_SIMPLE_TAG; 1117 } 1118 1119 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1120 cmd->i_state = ISTATE_NEW_CMD; 1121 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1122 cmd->immediate_data = (payload_length) ? 1 : 0; 1123 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1124 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1125 if (cmd->unsolicited_data) 1126 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1127 1128 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1129 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1130 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1131 else 1132 cmd->targ_xfer_tag = 0xFFFFFFFF; 1133 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1134 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1135 cmd->first_burst_len = payload_length; 1136 1137 if (!conn->sess->sess_ops->RDMAExtensions && 1138 cmd->data_direction == DMA_FROM_DEVICE) { 1139 struct iscsi_datain_req *dr; 1140 1141 dr = iscsit_allocate_datain_req(); 1142 if (!dr) 1143 return iscsit_add_reject_cmd(cmd, 1144 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1145 1146 iscsit_attach_datain_req(cmd, dr); 1147 } 1148 1149 /* 1150 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1151 */ 1152 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1153 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1154 cmd->data_direction, sam_task_attr, 1155 cmd->sense_buffer + 2); 1156 1157 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1158 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1159 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1160 conn->cid); 1161 1162 target_get_sess_cmd(&cmd->se_cmd, true); 1163 1164 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1165 scsilun_to_int(&hdr->lun)); 1166 if (cmd->sense_reason) 1167 goto attach_cmd; 1168 1169 /* only used for printks or comparing with ->ref_task_tag */ 1170 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1171 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1172 if (cmd->sense_reason) { 1173 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1174 return iscsit_add_reject_cmd(cmd, 1175 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1176 } 1177 1178 goto attach_cmd; 1179 } 1180 1181 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1182 return iscsit_add_reject_cmd(cmd, 1183 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1184 } 1185 1186 attach_cmd: 1187 spin_lock_bh(&conn->cmd_lock); 1188 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1189 spin_unlock_bh(&conn->cmd_lock); 1190 /* 1191 * Check if we need to delay processing because of ALUA 1192 * Active/NonOptimized primary access state.. 1193 */ 1194 core_alua_check_nonop_delay(&cmd->se_cmd); 1195 1196 return 0; 1197 } 1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1199 1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1201 { 1202 iscsit_set_dataout_sequence_values(cmd); 1203 1204 spin_lock_bh(&cmd->dataout_timeout_lock); 1205 iscsit_start_dataout_timer(cmd, cmd->conn); 1206 spin_unlock_bh(&cmd->dataout_timeout_lock); 1207 } 1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1209 1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1211 struct iscsi_scsi_req *hdr) 1212 { 1213 int cmdsn_ret = 0; 1214 /* 1215 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1216 * the Immediate Bit is not set, and no Immediate 1217 * Data is attached. 1218 * 1219 * A PDU/CmdSN carrying Immediate Data can only 1220 * be processed after the DataCRC has passed. 1221 * If the DataCRC fails, the CmdSN MUST NOT 1222 * be acknowledged. (See below) 1223 */ 1224 if (!cmd->immediate_data) { 1225 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1226 (unsigned char *)hdr, hdr->cmdsn); 1227 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1228 return -1; 1229 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1230 target_put_sess_cmd(&cmd->se_cmd); 1231 return 0; 1232 } 1233 } 1234 1235 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1236 1237 /* 1238 * If no Immediate Data is attached, it's OK to return now. 1239 */ 1240 if (!cmd->immediate_data) { 1241 if (!cmd->sense_reason && cmd->unsolicited_data) 1242 iscsit_set_unsoliticed_dataout(cmd); 1243 if (!cmd->sense_reason) 1244 return 0; 1245 1246 target_put_sess_cmd(&cmd->se_cmd); 1247 return 0; 1248 } 1249 1250 /* 1251 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1252 * execution. These exceptions are processed in CmdSN order using 1253 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1254 */ 1255 if (cmd->sense_reason) 1256 return 1; 1257 /* 1258 * Call directly into transport_generic_new_cmd() to perform 1259 * the backend memory allocation. 1260 */ 1261 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1262 if (cmd->sense_reason) 1263 return 1; 1264 1265 return 0; 1266 } 1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1268 1269 static int 1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1271 bool dump_payload) 1272 { 1273 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1274 /* 1275 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1276 */ 1277 if (dump_payload) 1278 goto after_immediate_data; 1279 /* 1280 * Check for underflow case where both EDTL and immediate data payload 1281 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has 1282 * already been set in target_cmd_size_check() as se_cmd->data_length. 1283 * 1284 * For this special case, fail the command and dump the immediate data 1285 * payload. 1286 */ 1287 if (cmd->first_burst_len > cmd->se_cmd.data_length) { 1288 cmd->sense_reason = TCM_INVALID_CDB_FIELD; 1289 goto after_immediate_data; 1290 } 1291 1292 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1293 cmd->first_burst_len); 1294 after_immediate_data: 1295 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1296 /* 1297 * A PDU/CmdSN carrying Immediate Data passed 1298 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1299 * Immediate Bit is not set. 1300 */ 1301 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1302 (unsigned char *)hdr, hdr->cmdsn); 1303 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1304 return -1; 1305 1306 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1307 int rc; 1308 1309 rc = iscsit_dump_data_payload(cmd->conn, 1310 cmd->first_burst_len, 1); 1311 target_put_sess_cmd(&cmd->se_cmd); 1312 return rc; 1313 } else if (cmd->unsolicited_data) 1314 iscsit_set_unsoliticed_dataout(cmd); 1315 1316 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1317 /* 1318 * Immediate Data failed DataCRC and ERL>=1, 1319 * silently drop this PDU and let the initiator 1320 * plug the CmdSN gap. 1321 * 1322 * FIXME: Send Unsolicited NOPIN with reserved 1323 * TTT here to help the initiator figure out 1324 * the missing CmdSN, although they should be 1325 * intelligent enough to determine the missing 1326 * CmdSN and issue a retry to plug the sequence. 1327 */ 1328 cmd->i_state = ISTATE_REMOVE; 1329 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1330 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1331 return -1; 1332 1333 return 0; 1334 } 1335 1336 static int 1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1338 unsigned char *buf) 1339 { 1340 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1341 int rc, immed_data; 1342 bool dump_payload = false; 1343 1344 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1345 if (rc < 0) 1346 return 0; 1347 /* 1348 * Allocation iovecs needed for struct socket operations for 1349 * traditional iSCSI block I/O. 1350 */ 1351 if (iscsit_allocate_iovecs(cmd) < 0) { 1352 return iscsit_reject_cmd(cmd, 1353 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1354 } 1355 immed_data = cmd->immediate_data; 1356 1357 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1358 if (rc < 0) 1359 return rc; 1360 else if (rc > 0) 1361 dump_payload = true; 1362 1363 if (!immed_data) 1364 return 0; 1365 1366 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1367 } 1368 1369 static u32 iscsit_do_crypto_hash_sg( 1370 struct ahash_request *hash, 1371 struct iscsi_cmd *cmd, 1372 u32 data_offset, 1373 u32 data_length, 1374 u32 padding, 1375 u8 *pad_bytes) 1376 { 1377 u32 data_crc; 1378 struct scatterlist *sg; 1379 unsigned int page_off; 1380 1381 crypto_ahash_init(hash); 1382 1383 sg = cmd->first_data_sg; 1384 page_off = cmd->first_data_sg_off; 1385 1386 while (data_length) { 1387 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1388 1389 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1390 crypto_ahash_update(hash); 1391 1392 data_length -= cur_len; 1393 page_off = 0; 1394 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1395 sg = sg_next(sg); 1396 } 1397 1398 if (padding) { 1399 struct scatterlist pad_sg; 1400 1401 sg_init_one(&pad_sg, pad_bytes, padding); 1402 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1403 padding); 1404 crypto_ahash_finup(hash); 1405 } else { 1406 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1407 crypto_ahash_final(hash); 1408 } 1409 1410 return data_crc; 1411 } 1412 1413 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1414 const void *buf, u32 payload_length, u32 padding, 1415 const void *pad_bytes, void *data_crc) 1416 { 1417 struct scatterlist sg[2]; 1418 1419 sg_init_table(sg, ARRAY_SIZE(sg)); 1420 sg_set_buf(sg, buf, payload_length); 1421 sg_set_buf(sg + 1, pad_bytes, padding); 1422 1423 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1424 1425 crypto_ahash_digest(hash); 1426 } 1427 1428 int 1429 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1430 struct iscsi_cmd *cmd, u32 payload_length, 1431 bool *success) 1432 { 1433 struct iscsi_data *hdr = buf; 1434 struct se_cmd *se_cmd; 1435 int rc; 1436 1437 /* iSCSI write */ 1438 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1439 1440 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1441 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1442 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1443 payload_length, conn->cid); 1444 1445 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1446 pr_err("Command ITT: 0x%08x received DataOUT after" 1447 " last DataOUT received, dumping payload\n", 1448 cmd->init_task_tag); 1449 return iscsit_dump_data_payload(conn, payload_length, 1); 1450 } 1451 1452 if (cmd->data_direction != DMA_TO_DEVICE) { 1453 pr_err("Command ITT: 0x%08x received DataOUT for a" 1454 " NON-WRITE command.\n", cmd->init_task_tag); 1455 return iscsit_dump_data_payload(conn, payload_length, 1); 1456 } 1457 se_cmd = &cmd->se_cmd; 1458 iscsit_mod_dataout_timer(cmd); 1459 1460 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1461 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1462 be32_to_cpu(hdr->offset), payload_length, 1463 cmd->se_cmd.data_length); 1464 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1465 } 1466 1467 if (cmd->unsolicited_data) { 1468 int dump_unsolicited_data = 0; 1469 1470 if (conn->sess->sess_ops->InitialR2T) { 1471 pr_err("Received unexpected unsolicited data" 1472 " while InitialR2T=Yes, protocol error.\n"); 1473 transport_send_check_condition_and_sense(&cmd->se_cmd, 1474 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1475 return -1; 1476 } 1477 /* 1478 * Special case for dealing with Unsolicited DataOUT 1479 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1480 * failures; 1481 */ 1482 1483 /* Something's amiss if we're not in WRITE_PENDING state... */ 1484 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1485 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1486 dump_unsolicited_data = 1; 1487 1488 if (dump_unsolicited_data) { 1489 /* 1490 * Check if a delayed TASK_ABORTED status needs to 1491 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1492 * received with the unsolicited data out. 1493 */ 1494 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1495 iscsit_stop_dataout_timer(cmd); 1496 1497 transport_check_aborted_status(se_cmd, 1498 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1499 return iscsit_dump_data_payload(conn, payload_length, 1); 1500 } 1501 } else { 1502 /* 1503 * For the normal solicited data path: 1504 * 1505 * Check for a delayed TASK_ABORTED status and dump any 1506 * incoming data out payload if one exists. Also, when the 1507 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1508 * data out sequence, we decrement outstanding_r2ts. Once 1509 * outstanding_r2ts reaches zero, go ahead and send the delayed 1510 * TASK_ABORTED status. 1511 */ 1512 if (se_cmd->transport_state & CMD_T_ABORTED) { 1513 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1514 if (--cmd->outstanding_r2ts < 1) { 1515 iscsit_stop_dataout_timer(cmd); 1516 transport_check_aborted_status( 1517 se_cmd, 1); 1518 } 1519 1520 return iscsit_dump_data_payload(conn, payload_length, 1); 1521 } 1522 } 1523 /* 1524 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1525 * within-command recovery checks before receiving the payload. 1526 */ 1527 rc = iscsit_check_pre_dataout(cmd, buf); 1528 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1529 return 0; 1530 else if (rc == DATAOUT_CANNOT_RECOVER) 1531 return -1; 1532 *success = true; 1533 return 0; 1534 } 1535 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1536 1537 int 1538 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1539 struct iscsi_cmd **out_cmd) 1540 { 1541 struct iscsi_data *hdr = buf; 1542 struct iscsi_cmd *cmd; 1543 u32 payload_length = ntoh24(hdr->dlength); 1544 int rc; 1545 bool success = false; 1546 1547 if (!payload_length) { 1548 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1549 return 0; 1550 } 1551 1552 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1553 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1554 " MaxXmitDataSegmentLength: %u\n", payload_length, 1555 conn->conn_ops->MaxXmitDataSegmentLength); 1556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1557 } 1558 1559 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1560 if (!cmd) 1561 return 0; 1562 1563 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1564 1565 if (success) 1566 *out_cmd = cmd; 1567 1568 return rc; 1569 } 1570 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1571 1572 static int 1573 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1574 struct iscsi_data *hdr) 1575 { 1576 struct kvec *iov; 1577 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1578 u32 payload_length = ntoh24(hdr->dlength); 1579 int iov_ret, data_crc_failed = 0; 1580 1581 rx_size += payload_length; 1582 iov = &cmd->iov_data[0]; 1583 1584 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1585 payload_length); 1586 if (iov_ret < 0) 1587 return -1; 1588 1589 iov_count += iov_ret; 1590 1591 padding = ((-payload_length) & 3); 1592 if (padding != 0) { 1593 iov[iov_count].iov_base = cmd->pad_bytes; 1594 iov[iov_count++].iov_len = padding; 1595 rx_size += padding; 1596 pr_debug("Receiving %u padding bytes.\n", padding); 1597 } 1598 1599 if (conn->conn_ops->DataDigest) { 1600 iov[iov_count].iov_base = &checksum; 1601 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1602 rx_size += ISCSI_CRC_LEN; 1603 } 1604 1605 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1606 1607 iscsit_unmap_iovec(cmd); 1608 1609 if (rx_got != rx_size) 1610 return -1; 1611 1612 if (conn->conn_ops->DataDigest) { 1613 u32 data_crc; 1614 1615 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1616 be32_to_cpu(hdr->offset), 1617 payload_length, padding, 1618 cmd->pad_bytes); 1619 1620 if (checksum != data_crc) { 1621 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1622 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1623 " does not match computed 0x%08x\n", 1624 hdr->itt, hdr->offset, payload_length, 1625 hdr->datasn, checksum, data_crc); 1626 data_crc_failed = 1; 1627 } else { 1628 pr_debug("Got CRC32C DataDigest 0x%08x for" 1629 " %u bytes of Data Out\n", checksum, 1630 payload_length); 1631 } 1632 } 1633 1634 return data_crc_failed; 1635 } 1636 1637 int 1638 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1639 bool data_crc_failed) 1640 { 1641 struct iscsi_conn *conn = cmd->conn; 1642 int rc, ooo_cmdsn; 1643 /* 1644 * Increment post receive data and CRC values or perform 1645 * within-command recovery. 1646 */ 1647 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1648 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1649 return 0; 1650 else if (rc == DATAOUT_SEND_R2T) { 1651 iscsit_set_dataout_sequence_values(cmd); 1652 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1653 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1654 /* 1655 * Handle extra special case for out of order 1656 * Unsolicited Data Out. 1657 */ 1658 spin_lock_bh(&cmd->istate_lock); 1659 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1662 spin_unlock_bh(&cmd->istate_lock); 1663 1664 iscsit_stop_dataout_timer(cmd); 1665 if (ooo_cmdsn) 1666 return 0; 1667 target_execute_cmd(&cmd->se_cmd); 1668 return 0; 1669 } else /* DATAOUT_CANNOT_RECOVER */ 1670 return -1; 1671 1672 return 0; 1673 } 1674 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1675 1676 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1677 { 1678 struct iscsi_cmd *cmd = NULL; 1679 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1680 int rc; 1681 bool data_crc_failed = false; 1682 1683 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1684 if (rc < 0) 1685 return 0; 1686 else if (!cmd) 1687 return 0; 1688 1689 rc = iscsit_get_dataout(conn, cmd, hdr); 1690 if (rc < 0) 1691 return rc; 1692 else if (rc > 0) 1693 data_crc_failed = true; 1694 1695 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1696 } 1697 1698 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1699 struct iscsi_nopout *hdr) 1700 { 1701 u32 payload_length = ntoh24(hdr->dlength); 1702 1703 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1704 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1705 if (!cmd) 1706 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1707 (unsigned char *)hdr); 1708 1709 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1710 (unsigned char *)hdr); 1711 } 1712 1713 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1714 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1715 " not set, protocol error.\n"); 1716 if (!cmd) 1717 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1718 (unsigned char *)hdr); 1719 1720 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1721 (unsigned char *)hdr); 1722 } 1723 1724 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1725 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1726 " greater than MaxXmitDataSegmentLength: %u, protocol" 1727 " error.\n", payload_length, 1728 conn->conn_ops->MaxXmitDataSegmentLength); 1729 if (!cmd) 1730 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1731 (unsigned char *)hdr); 1732 1733 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1734 (unsigned char *)hdr); 1735 } 1736 1737 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1738 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1739 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1740 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1741 payload_length); 1742 /* 1743 * This is not a response to a Unsolicited NopIN, which means 1744 * it can either be a NOPOUT ping request (with a valid ITT), 1745 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1746 * Either way, make sure we allocate an struct iscsi_cmd, as both 1747 * can contain ping data. 1748 */ 1749 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1750 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1751 cmd->i_state = ISTATE_SEND_NOPIN; 1752 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1753 1 : 0); 1754 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1755 cmd->targ_xfer_tag = 0xFFFFFFFF; 1756 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1757 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1758 cmd->data_direction = DMA_NONE; 1759 } 1760 1761 return 0; 1762 } 1763 EXPORT_SYMBOL(iscsit_setup_nop_out); 1764 1765 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1766 struct iscsi_nopout *hdr) 1767 { 1768 struct iscsi_cmd *cmd_p = NULL; 1769 int cmdsn_ret = 0; 1770 /* 1771 * Initiator is expecting a NopIN ping reply.. 1772 */ 1773 if (hdr->itt != RESERVED_ITT) { 1774 if (!cmd) 1775 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1776 (unsigned char *)hdr); 1777 1778 spin_lock_bh(&conn->cmd_lock); 1779 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1780 spin_unlock_bh(&conn->cmd_lock); 1781 1782 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1783 1784 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1785 iscsit_add_cmd_to_response_queue(cmd, conn, 1786 cmd->i_state); 1787 return 0; 1788 } 1789 1790 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1791 (unsigned char *)hdr, hdr->cmdsn); 1792 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1793 return 0; 1794 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1795 return -1; 1796 1797 return 0; 1798 } 1799 /* 1800 * This was a response to a unsolicited NOPIN ping. 1801 */ 1802 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1803 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1804 if (!cmd_p) 1805 return -EINVAL; 1806 1807 iscsit_stop_nopin_response_timer(conn); 1808 1809 cmd_p->i_state = ISTATE_REMOVE; 1810 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1811 1812 iscsit_start_nopin_timer(conn); 1813 return 0; 1814 } 1815 /* 1816 * Otherwise, initiator is not expecting a NOPIN is response. 1817 * Just ignore for now. 1818 */ 1819 1820 if (cmd) 1821 iscsit_free_cmd(cmd, false); 1822 1823 return 0; 1824 } 1825 EXPORT_SYMBOL(iscsit_process_nop_out); 1826 1827 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1828 unsigned char *buf) 1829 { 1830 unsigned char *ping_data = NULL; 1831 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1832 struct kvec *iov = NULL; 1833 u32 payload_length = ntoh24(hdr->dlength); 1834 int ret; 1835 1836 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1837 if (ret < 0) 1838 return 0; 1839 /* 1840 * Handle NOP-OUT payload for traditional iSCSI sockets 1841 */ 1842 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1843 u32 checksum, data_crc, padding = 0; 1844 int niov = 0, rx_got, rx_size = payload_length; 1845 1846 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1847 if (!ping_data) { 1848 ret = -1; 1849 goto out; 1850 } 1851 1852 iov = &cmd->iov_misc[0]; 1853 iov[niov].iov_base = ping_data; 1854 iov[niov++].iov_len = payload_length; 1855 1856 padding = ((-payload_length) & 3); 1857 if (padding != 0) { 1858 pr_debug("Receiving %u additional bytes" 1859 " for padding.\n", padding); 1860 iov[niov].iov_base = &cmd->pad_bytes; 1861 iov[niov++].iov_len = padding; 1862 rx_size += padding; 1863 } 1864 if (conn->conn_ops->DataDigest) { 1865 iov[niov].iov_base = &checksum; 1866 iov[niov++].iov_len = ISCSI_CRC_LEN; 1867 rx_size += ISCSI_CRC_LEN; 1868 } 1869 1870 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1871 if (rx_got != rx_size) { 1872 ret = -1; 1873 goto out; 1874 } 1875 1876 if (conn->conn_ops->DataDigest) { 1877 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1878 payload_length, padding, 1879 cmd->pad_bytes, &data_crc); 1880 1881 if (checksum != data_crc) { 1882 pr_err("Ping data CRC32C DataDigest" 1883 " 0x%08x does not match computed 0x%08x\n", 1884 checksum, data_crc); 1885 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1886 pr_err("Unable to recover from" 1887 " NOPOUT Ping DataCRC failure while in" 1888 " ERL=0.\n"); 1889 ret = -1; 1890 goto out; 1891 } else { 1892 /* 1893 * Silently drop this PDU and let the 1894 * initiator plug the CmdSN gap. 1895 */ 1896 pr_debug("Dropping NOPOUT" 1897 " Command CmdSN: 0x%08x due to" 1898 " DataCRC error.\n", hdr->cmdsn); 1899 ret = 0; 1900 goto out; 1901 } 1902 } else { 1903 pr_debug("Got CRC32C DataDigest" 1904 " 0x%08x for %u bytes of ping data.\n", 1905 checksum, payload_length); 1906 } 1907 } 1908 1909 ping_data[payload_length] = '\0'; 1910 /* 1911 * Attach ping data to struct iscsi_cmd->buf_ptr. 1912 */ 1913 cmd->buf_ptr = ping_data; 1914 cmd->buf_ptr_size = payload_length; 1915 1916 pr_debug("Got %u bytes of NOPOUT ping" 1917 " data.\n", payload_length); 1918 pr_debug("Ping Data: \"%s\"\n", ping_data); 1919 } 1920 1921 return iscsit_process_nop_out(conn, cmd, hdr); 1922 out: 1923 if (cmd) 1924 iscsit_free_cmd(cmd, false); 1925 1926 kfree(ping_data); 1927 return ret; 1928 } 1929 1930 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1931 { 1932 switch (iscsi_tmf) { 1933 case ISCSI_TM_FUNC_ABORT_TASK: 1934 return TMR_ABORT_TASK; 1935 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1936 return TMR_ABORT_TASK_SET; 1937 case ISCSI_TM_FUNC_CLEAR_ACA: 1938 return TMR_CLEAR_ACA; 1939 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1940 return TMR_CLEAR_TASK_SET; 1941 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1942 return TMR_LUN_RESET; 1943 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1944 return TMR_TARGET_WARM_RESET; 1945 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1946 return TMR_TARGET_COLD_RESET; 1947 default: 1948 return TMR_UNKNOWN; 1949 } 1950 } 1951 1952 int 1953 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1954 unsigned char *buf) 1955 { 1956 struct se_tmr_req *se_tmr; 1957 struct iscsi_tmr_req *tmr_req; 1958 struct iscsi_tm *hdr; 1959 int out_of_order_cmdsn = 0, ret; 1960 u8 function, tcm_function = TMR_UNKNOWN; 1961 1962 hdr = (struct iscsi_tm *) buf; 1963 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1964 function = hdr->flags; 1965 1966 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1967 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1968 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1969 hdr->rtt, hdr->refcmdsn, conn->cid); 1970 1971 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1972 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1973 hdr->rtt != RESERVED_ITT)) { 1974 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1975 hdr->rtt = RESERVED_ITT; 1976 } 1977 1978 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1979 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1980 pr_err("Task Management Request TASK_REASSIGN not" 1981 " issued as immediate command, bad iSCSI Initiator" 1982 "implementation\n"); 1983 return iscsit_add_reject_cmd(cmd, 1984 ISCSI_REASON_PROTOCOL_ERROR, buf); 1985 } 1986 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1987 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1988 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1989 1990 cmd->data_direction = DMA_NONE; 1991 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1992 if (!cmd->tmr_req) { 1993 return iscsit_add_reject_cmd(cmd, 1994 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1995 buf); 1996 } 1997 1998 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1999 conn->sess->se_sess, 0, DMA_NONE, 2000 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2001 2002 target_get_sess_cmd(&cmd->se_cmd, true); 2003 2004 /* 2005 * TASK_REASSIGN for ERL=2 / connection stays inside of 2006 * LIO-Target $FABRIC_MOD 2007 */ 2008 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2009 tcm_function = iscsit_convert_tmf(function); 2010 if (tcm_function == TMR_UNKNOWN) { 2011 pr_err("Unknown iSCSI TMR Function:" 2012 " 0x%02x\n", function); 2013 return iscsit_add_reject_cmd(cmd, 2014 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2015 } 2016 } 2017 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2018 GFP_KERNEL); 2019 if (ret < 0) 2020 return iscsit_add_reject_cmd(cmd, 2021 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2022 2023 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2024 2025 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2026 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2027 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2028 cmd->init_task_tag = hdr->itt; 2029 cmd->targ_xfer_tag = 0xFFFFFFFF; 2030 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2031 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2032 se_tmr = cmd->se_cmd.se_tmr_req; 2033 tmr_req = cmd->tmr_req; 2034 /* 2035 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2036 */ 2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2038 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2039 scsilun_to_int(&hdr->lun)); 2040 if (ret < 0) { 2041 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2042 goto attach; 2043 } 2044 } 2045 2046 switch (function) { 2047 case ISCSI_TM_FUNC_ABORT_TASK: 2048 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2049 if (se_tmr->response) 2050 goto attach; 2051 break; 2052 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2053 case ISCSI_TM_FUNC_CLEAR_ACA: 2054 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2055 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2056 break; 2057 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2058 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2059 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2060 goto attach; 2061 } 2062 break; 2063 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2064 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2065 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2066 goto attach; 2067 } 2068 break; 2069 case ISCSI_TM_FUNC_TASK_REASSIGN: 2070 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2071 /* 2072 * Perform sanity checks on the ExpDataSN only if the 2073 * TASK_REASSIGN was successful. 2074 */ 2075 if (se_tmr->response) 2076 break; 2077 2078 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2079 return iscsit_add_reject_cmd(cmd, 2080 ISCSI_REASON_BOOKMARK_INVALID, buf); 2081 break; 2082 default: 2083 pr_err("Unknown TMR function: 0x%02x, protocol" 2084 " error.\n", function); 2085 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2086 goto attach; 2087 } 2088 2089 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2090 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2091 se_tmr->call_transport = 1; 2092 attach: 2093 spin_lock_bh(&conn->cmd_lock); 2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2095 spin_unlock_bh(&conn->cmd_lock); 2096 2097 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2098 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2099 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2100 out_of_order_cmdsn = 1; 2101 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2102 target_put_sess_cmd(&cmd->se_cmd); 2103 return 0; 2104 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2105 return -1; 2106 } 2107 } 2108 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2109 2110 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2111 return 0; 2112 /* 2113 * Found the referenced task, send to transport for processing. 2114 */ 2115 if (se_tmr->call_transport) 2116 return transport_generic_handle_tmr(&cmd->se_cmd); 2117 2118 /* 2119 * Could not find the referenced LUN, task, or Task Management 2120 * command not authorized or supported. Change state and 2121 * let the tx_thread send the response. 2122 * 2123 * For connection recovery, this is also the default action for 2124 * TMR TASK_REASSIGN. 2125 */ 2126 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2127 target_put_sess_cmd(&cmd->se_cmd); 2128 return 0; 2129 } 2130 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2131 2132 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2133 int 2134 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2135 struct iscsi_text *hdr) 2136 { 2137 u32 payload_length = ntoh24(hdr->dlength); 2138 2139 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2140 pr_err("Unable to accept text parameter length: %u" 2141 "greater than MaxXmitDataSegmentLength %u.\n", 2142 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2143 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2144 (unsigned char *)hdr); 2145 } 2146 2147 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2148 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2149 pr_err("Multi sequence text commands currently not supported\n"); 2150 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2151 (unsigned char *)hdr); 2152 } 2153 2154 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2155 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2156 hdr->exp_statsn, payload_length); 2157 2158 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2159 cmd->i_state = ISTATE_SEND_TEXTRSP; 2160 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2161 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2162 cmd->targ_xfer_tag = 0xFFFFFFFF; 2163 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2164 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2165 cmd->data_direction = DMA_NONE; 2166 kfree(cmd->text_in_ptr); 2167 cmd->text_in_ptr = NULL; 2168 2169 return 0; 2170 } 2171 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2172 2173 int 2174 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2175 struct iscsi_text *hdr) 2176 { 2177 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2178 int cmdsn_ret; 2179 2180 if (!text_in) { 2181 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2182 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2183 pr_err("Unable to locate text_in buffer for sendtargets" 2184 " discovery\n"); 2185 goto reject; 2186 } 2187 goto empty_sendtargets; 2188 } 2189 if (strncmp("SendTargets", text_in, 11) != 0) { 2190 pr_err("Received Text Data that is not" 2191 " SendTargets, cannot continue.\n"); 2192 goto reject; 2193 } 2194 text_ptr = strchr(text_in, '='); 2195 if (!text_ptr) { 2196 pr_err("No \"=\" separator found in Text Data," 2197 " cannot continue.\n"); 2198 goto reject; 2199 } 2200 if (!strncmp("=All", text_ptr, 4)) { 2201 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2202 } else if (!strncmp("=iqn.", text_ptr, 5) || 2203 !strncmp("=eui.", text_ptr, 5)) { 2204 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2205 } else { 2206 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2207 goto reject; 2208 } 2209 2210 spin_lock_bh(&conn->cmd_lock); 2211 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2212 spin_unlock_bh(&conn->cmd_lock); 2213 2214 empty_sendtargets: 2215 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2216 2217 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2218 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2219 (unsigned char *)hdr, hdr->cmdsn); 2220 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2221 return -1; 2222 2223 return 0; 2224 } 2225 2226 return iscsit_execute_cmd(cmd, 0); 2227 2228 reject: 2229 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2230 (unsigned char *)hdr); 2231 } 2232 EXPORT_SYMBOL(iscsit_process_text_cmd); 2233 2234 static int 2235 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2236 unsigned char *buf) 2237 { 2238 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2239 char *text_in = NULL; 2240 u32 payload_length = ntoh24(hdr->dlength); 2241 int rx_size, rc; 2242 2243 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2244 if (rc < 0) 2245 return 0; 2246 2247 rx_size = payload_length; 2248 if (payload_length) { 2249 u32 checksum = 0, data_crc = 0; 2250 u32 padding = 0, pad_bytes = 0; 2251 int niov = 0, rx_got; 2252 struct kvec iov[3]; 2253 2254 text_in = kzalloc(payload_length, GFP_KERNEL); 2255 if (!text_in) 2256 goto reject; 2257 2258 cmd->text_in_ptr = text_in; 2259 2260 memset(iov, 0, 3 * sizeof(struct kvec)); 2261 iov[niov].iov_base = text_in; 2262 iov[niov++].iov_len = payload_length; 2263 2264 padding = ((-payload_length) & 3); 2265 if (padding != 0) { 2266 iov[niov].iov_base = &pad_bytes; 2267 iov[niov++].iov_len = padding; 2268 rx_size += padding; 2269 pr_debug("Receiving %u additional bytes" 2270 " for padding.\n", padding); 2271 } 2272 if (conn->conn_ops->DataDigest) { 2273 iov[niov].iov_base = &checksum; 2274 iov[niov++].iov_len = ISCSI_CRC_LEN; 2275 rx_size += ISCSI_CRC_LEN; 2276 } 2277 2278 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2279 if (rx_got != rx_size) 2280 goto reject; 2281 2282 if (conn->conn_ops->DataDigest) { 2283 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in, 2284 payload_length, padding, 2285 &pad_bytes, &data_crc); 2286 2287 if (checksum != data_crc) { 2288 pr_err("Text data CRC32C DataDigest" 2289 " 0x%08x does not match computed" 2290 " 0x%08x\n", checksum, data_crc); 2291 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2292 pr_err("Unable to recover from" 2293 " Text Data digest failure while in" 2294 " ERL=0.\n"); 2295 goto reject; 2296 } else { 2297 /* 2298 * Silently drop this PDU and let the 2299 * initiator plug the CmdSN gap. 2300 */ 2301 pr_debug("Dropping Text" 2302 " Command CmdSN: 0x%08x due to" 2303 " DataCRC error.\n", hdr->cmdsn); 2304 kfree(text_in); 2305 return 0; 2306 } 2307 } else { 2308 pr_debug("Got CRC32C DataDigest" 2309 " 0x%08x for %u bytes of text data.\n", 2310 checksum, payload_length); 2311 } 2312 } 2313 text_in[payload_length - 1] = '\0'; 2314 pr_debug("Successfully read %d bytes of text" 2315 " data.\n", payload_length); 2316 } 2317 2318 return iscsit_process_text_cmd(conn, cmd, hdr); 2319 2320 reject: 2321 kfree(cmd->text_in_ptr); 2322 cmd->text_in_ptr = NULL; 2323 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2324 } 2325 2326 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2327 { 2328 struct iscsi_conn *conn_p; 2329 struct iscsi_session *sess = conn->sess; 2330 2331 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2332 " for SID: %u.\n", conn->cid, conn->sess->sid); 2333 2334 atomic_set(&sess->session_logout, 1); 2335 atomic_set(&conn->conn_logout_remove, 1); 2336 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2337 2338 iscsit_inc_conn_usage_count(conn); 2339 iscsit_inc_session_usage_count(sess); 2340 2341 spin_lock_bh(&sess->conn_lock); 2342 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2343 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2344 continue; 2345 2346 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2347 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2348 } 2349 spin_unlock_bh(&sess->conn_lock); 2350 2351 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2352 2353 return 0; 2354 } 2355 2356 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2357 { 2358 struct iscsi_conn *l_conn; 2359 struct iscsi_session *sess = conn->sess; 2360 2361 pr_debug("Received logout request CLOSECONNECTION for CID:" 2362 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2363 2364 /* 2365 * A Logout Request with a CLOSECONNECTION reason code for a CID 2366 * can arrive on a connection with a differing CID. 2367 */ 2368 if (conn->cid == cmd->logout_cid) { 2369 spin_lock_bh(&conn->state_lock); 2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2371 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2372 2373 atomic_set(&conn->conn_logout_remove, 1); 2374 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2375 iscsit_inc_conn_usage_count(conn); 2376 2377 spin_unlock_bh(&conn->state_lock); 2378 } else { 2379 /* 2380 * Handle all different cid CLOSECONNECTION requests in 2381 * iscsit_logout_post_handler_diffcid() as to give enough 2382 * time for any non immediate command's CmdSN to be 2383 * acknowledged on the connection in question. 2384 * 2385 * Here we simply make sure the CID is still around. 2386 */ 2387 l_conn = iscsit_get_conn_from_cid(sess, 2388 cmd->logout_cid); 2389 if (!l_conn) { 2390 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2391 iscsit_add_cmd_to_response_queue(cmd, conn, 2392 cmd->i_state); 2393 return 0; 2394 } 2395 2396 iscsit_dec_conn_usage_count(l_conn); 2397 } 2398 2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2400 2401 return 0; 2402 } 2403 2404 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2405 { 2406 struct iscsi_session *sess = conn->sess; 2407 2408 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2409 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2410 2411 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2412 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2413 " while ERL!=2.\n"); 2414 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2415 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2416 return 0; 2417 } 2418 2419 if (conn->cid == cmd->logout_cid) { 2420 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2421 " with CID: %hu on CID: %hu, implementation error.\n", 2422 cmd->logout_cid, conn->cid); 2423 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2424 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2425 return 0; 2426 } 2427 2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2429 2430 return 0; 2431 } 2432 2433 int 2434 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2435 unsigned char *buf) 2436 { 2437 int cmdsn_ret, logout_remove = 0; 2438 u8 reason_code = 0; 2439 struct iscsi_logout *hdr; 2440 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2441 2442 hdr = (struct iscsi_logout *) buf; 2443 reason_code = (hdr->flags & 0x7f); 2444 2445 if (tiqn) { 2446 spin_lock(&tiqn->logout_stats.lock); 2447 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2448 tiqn->logout_stats.normal_logouts++; 2449 else 2450 tiqn->logout_stats.abnormal_logouts++; 2451 spin_unlock(&tiqn->logout_stats.lock); 2452 } 2453 2454 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2455 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2456 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2457 hdr->cid, conn->cid); 2458 2459 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2460 pr_err("Received logout request on connection that" 2461 " is not in logged in state, ignoring request.\n"); 2462 iscsit_free_cmd(cmd, false); 2463 return 0; 2464 } 2465 2466 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2467 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2468 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2469 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2470 cmd->targ_xfer_tag = 0xFFFFFFFF; 2471 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2472 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2473 cmd->logout_cid = be16_to_cpu(hdr->cid); 2474 cmd->logout_reason = reason_code; 2475 cmd->data_direction = DMA_NONE; 2476 2477 /* 2478 * We need to sleep in these cases (by returning 1) until the Logout 2479 * Response gets sent in the tx thread. 2480 */ 2481 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2482 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2483 be16_to_cpu(hdr->cid) == conn->cid)) 2484 logout_remove = 1; 2485 2486 spin_lock_bh(&conn->cmd_lock); 2487 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2488 spin_unlock_bh(&conn->cmd_lock); 2489 2490 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2491 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2492 2493 /* 2494 * Immediate commands are executed, well, immediately. 2495 * Non-Immediate Logout Commands are executed in CmdSN order. 2496 */ 2497 if (cmd->immediate_cmd) { 2498 int ret = iscsit_execute_cmd(cmd, 0); 2499 2500 if (ret < 0) 2501 return ret; 2502 } else { 2503 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2504 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2505 logout_remove = 0; 2506 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2507 return -1; 2508 } 2509 2510 return logout_remove; 2511 } 2512 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2513 2514 int iscsit_handle_snack( 2515 struct iscsi_conn *conn, 2516 unsigned char *buf) 2517 { 2518 struct iscsi_snack *hdr; 2519 2520 hdr = (struct iscsi_snack *) buf; 2521 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2522 2523 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2524 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2525 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2526 hdr->begrun, hdr->runlength, conn->cid); 2527 2528 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2529 pr_err("Initiator sent SNACK request while in" 2530 " ErrorRecoveryLevel=0.\n"); 2531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2532 buf); 2533 } 2534 /* 2535 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2536 * call from inside iscsi_send_recovery_datain_or_r2t(). 2537 */ 2538 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2539 case 0: 2540 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2541 hdr->itt, 2542 be32_to_cpu(hdr->ttt), 2543 be32_to_cpu(hdr->begrun), 2544 be32_to_cpu(hdr->runlength)); 2545 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2546 return iscsit_handle_status_snack(conn, hdr->itt, 2547 be32_to_cpu(hdr->ttt), 2548 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2549 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2550 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2551 be32_to_cpu(hdr->begrun), 2552 be32_to_cpu(hdr->runlength)); 2553 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2554 /* FIXME: Support R-Data SNACK */ 2555 pr_err("R-Data SNACK Not Supported.\n"); 2556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2557 buf); 2558 default: 2559 pr_err("Unknown SNACK type 0x%02x, protocol" 2560 " error.\n", hdr->flags & 0x0f); 2561 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2562 buf); 2563 } 2564 2565 return 0; 2566 } 2567 EXPORT_SYMBOL(iscsit_handle_snack); 2568 2569 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2570 { 2571 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2572 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2573 wait_for_completion_interruptible_timeout( 2574 &conn->rx_half_close_comp, 2575 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2576 } 2577 } 2578 2579 static int iscsit_handle_immediate_data( 2580 struct iscsi_cmd *cmd, 2581 struct iscsi_scsi_req *hdr, 2582 u32 length) 2583 { 2584 int iov_ret, rx_got = 0, rx_size = 0; 2585 u32 checksum, iov_count = 0, padding = 0; 2586 struct iscsi_conn *conn = cmd->conn; 2587 struct kvec *iov; 2588 2589 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2590 if (iov_ret < 0) 2591 return IMMEDIATE_DATA_CANNOT_RECOVER; 2592 2593 rx_size = length; 2594 iov_count = iov_ret; 2595 iov = &cmd->iov_data[0]; 2596 2597 padding = ((-length) & 3); 2598 if (padding != 0) { 2599 iov[iov_count].iov_base = cmd->pad_bytes; 2600 iov[iov_count++].iov_len = padding; 2601 rx_size += padding; 2602 } 2603 2604 if (conn->conn_ops->DataDigest) { 2605 iov[iov_count].iov_base = &checksum; 2606 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2607 rx_size += ISCSI_CRC_LEN; 2608 } 2609 2610 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2611 2612 iscsit_unmap_iovec(cmd); 2613 2614 if (rx_got != rx_size) { 2615 iscsit_rx_thread_wait_for_tcp(conn); 2616 return IMMEDIATE_DATA_CANNOT_RECOVER; 2617 } 2618 2619 if (conn->conn_ops->DataDigest) { 2620 u32 data_crc; 2621 2622 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2623 cmd->write_data_done, length, padding, 2624 cmd->pad_bytes); 2625 2626 if (checksum != data_crc) { 2627 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2628 " does not match computed 0x%08x\n", checksum, 2629 data_crc); 2630 2631 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2632 pr_err("Unable to recover from" 2633 " Immediate Data digest failure while" 2634 " in ERL=0.\n"); 2635 iscsit_reject_cmd(cmd, 2636 ISCSI_REASON_DATA_DIGEST_ERROR, 2637 (unsigned char *)hdr); 2638 return IMMEDIATE_DATA_CANNOT_RECOVER; 2639 } else { 2640 iscsit_reject_cmd(cmd, 2641 ISCSI_REASON_DATA_DIGEST_ERROR, 2642 (unsigned char *)hdr); 2643 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2644 } 2645 } else { 2646 pr_debug("Got CRC32C DataDigest 0x%08x for" 2647 " %u bytes of Immediate Data\n", checksum, 2648 length); 2649 } 2650 } 2651 2652 cmd->write_data_done += length; 2653 2654 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2655 spin_lock_bh(&cmd->istate_lock); 2656 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2657 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2658 spin_unlock_bh(&cmd->istate_lock); 2659 } 2660 2661 return IMMEDIATE_DATA_NORMAL_OPERATION; 2662 } 2663 2664 /* 2665 * Called with sess->conn_lock held. 2666 */ 2667 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2668 with active network interface */ 2669 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2670 { 2671 struct iscsi_cmd *cmd; 2672 struct iscsi_conn *conn_p; 2673 bool found = false; 2674 2675 /* 2676 * Only send a Asynchronous Message on connections whos network 2677 * interface is still functional. 2678 */ 2679 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2680 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2681 iscsit_inc_conn_usage_count(conn_p); 2682 found = true; 2683 break; 2684 } 2685 } 2686 2687 if (!found) 2688 return; 2689 2690 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2691 if (!cmd) { 2692 iscsit_dec_conn_usage_count(conn_p); 2693 return; 2694 } 2695 2696 cmd->logout_cid = conn->cid; 2697 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2698 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2699 2700 spin_lock_bh(&conn_p->cmd_lock); 2701 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2702 spin_unlock_bh(&conn_p->cmd_lock); 2703 2704 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2705 iscsit_dec_conn_usage_count(conn_p); 2706 } 2707 2708 static int iscsit_send_conn_drop_async_message( 2709 struct iscsi_cmd *cmd, 2710 struct iscsi_conn *conn) 2711 { 2712 struct iscsi_async *hdr; 2713 2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2715 2716 hdr = (struct iscsi_async *) cmd->pdu; 2717 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2718 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2719 cmd->init_task_tag = RESERVED_ITT; 2720 cmd->targ_xfer_tag = 0xFFFFFFFF; 2721 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2722 cmd->stat_sn = conn->stat_sn++; 2723 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2724 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2725 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2726 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2727 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2728 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2729 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2730 2731 pr_debug("Sending Connection Dropped Async Message StatSN:" 2732 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2733 cmd->logout_cid, conn->cid); 2734 2735 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2736 } 2737 2738 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2739 { 2740 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2741 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2742 wait_for_completion_interruptible_timeout( 2743 &conn->tx_half_close_comp, 2744 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2745 } 2746 } 2747 2748 void 2749 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2750 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2751 bool set_statsn) 2752 { 2753 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2754 hdr->flags = datain->flags; 2755 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2756 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2757 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2758 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2759 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2760 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2761 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2762 } 2763 } 2764 hton24(hdr->dlength, datain->length); 2765 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2766 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2767 (struct scsi_lun *)&hdr->lun); 2768 else 2769 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2770 2771 hdr->itt = cmd->init_task_tag; 2772 2773 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2774 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2775 else 2776 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2777 if (set_statsn) 2778 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2779 else 2780 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2781 2782 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2783 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2784 hdr->datasn = cpu_to_be32(datain->data_sn); 2785 hdr->offset = cpu_to_be32(datain->offset); 2786 2787 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2788 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2789 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2790 ntohl(hdr->offset), datain->length, conn->cid); 2791 } 2792 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2793 2794 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2795 { 2796 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2797 struct iscsi_datain datain; 2798 struct iscsi_datain_req *dr; 2799 int eodr = 0, ret; 2800 bool set_statsn = false; 2801 2802 memset(&datain, 0, sizeof(struct iscsi_datain)); 2803 dr = iscsit_get_datain_values(cmd, &datain); 2804 if (!dr) { 2805 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2806 cmd->init_task_tag); 2807 return -1; 2808 } 2809 /* 2810 * Be paranoid and double check the logic for now. 2811 */ 2812 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2813 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2814 " datain.length: %u exceeds cmd->data_length: %u\n", 2815 cmd->init_task_tag, datain.offset, datain.length, 2816 cmd->se_cmd.data_length); 2817 return -1; 2818 } 2819 2820 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2821 /* 2822 * Special case for successfully execution w/ both DATAIN 2823 * and Sense Data. 2824 */ 2825 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2826 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2827 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2828 else { 2829 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2830 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2831 iscsit_increment_maxcmdsn(cmd, conn->sess); 2832 cmd->stat_sn = conn->stat_sn++; 2833 set_statsn = true; 2834 } else if (dr->dr_complete == 2835 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2836 set_statsn = true; 2837 } 2838 2839 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2840 2841 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2842 if (ret < 0) 2843 return ret; 2844 2845 if (dr->dr_complete) { 2846 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2847 2 : 1; 2848 iscsit_free_datain_req(cmd, dr); 2849 } 2850 2851 return eodr; 2852 } 2853 2854 int 2855 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2856 struct iscsi_logout_rsp *hdr) 2857 { 2858 struct iscsi_conn *logout_conn = NULL; 2859 struct iscsi_conn_recovery *cr = NULL; 2860 struct iscsi_session *sess = conn->sess; 2861 /* 2862 * The actual shutting down of Sessions and/or Connections 2863 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2864 * is done in scsi_logout_post_handler(). 2865 */ 2866 switch (cmd->logout_reason) { 2867 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2868 pr_debug("iSCSI session logout successful, setting" 2869 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2870 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2871 break; 2872 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2873 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2874 break; 2875 /* 2876 * For CLOSECONNECTION logout requests carrying 2877 * a matching logout CID -> local CID, the reference 2878 * for the local CID will have been incremented in 2879 * iscsi_logout_closeconnection(). 2880 * 2881 * For CLOSECONNECTION logout requests carrying 2882 * a different CID than the connection it arrived 2883 * on, the connection responding to cmd->logout_cid 2884 * is stopped in iscsit_logout_post_handler_diffcid(). 2885 */ 2886 2887 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2888 " successful.\n", cmd->logout_cid, conn->cid); 2889 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2890 break; 2891 case ISCSI_LOGOUT_REASON_RECOVERY: 2892 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2893 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2894 break; 2895 /* 2896 * If the connection is still active from our point of view 2897 * force connection recovery to occur. 2898 */ 2899 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2900 cmd->logout_cid); 2901 if (logout_conn) { 2902 iscsit_connection_reinstatement_rcfr(logout_conn); 2903 iscsit_dec_conn_usage_count(logout_conn); 2904 } 2905 2906 cr = iscsit_get_inactive_connection_recovery_entry( 2907 conn->sess, cmd->logout_cid); 2908 if (!cr) { 2909 pr_err("Unable to locate CID: %hu for" 2910 " REMOVECONNFORRECOVERY Logout Request.\n", 2911 cmd->logout_cid); 2912 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2913 break; 2914 } 2915 2916 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2917 2918 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2919 " for recovery for CID: %hu on CID: %hu successful.\n", 2920 cmd->logout_cid, conn->cid); 2921 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2922 break; 2923 default: 2924 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2925 cmd->logout_reason); 2926 return -1; 2927 } 2928 2929 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2930 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2931 hdr->response = cmd->logout_response; 2932 hdr->itt = cmd->init_task_tag; 2933 cmd->stat_sn = conn->stat_sn++; 2934 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2935 2936 iscsit_increment_maxcmdsn(cmd, conn->sess); 2937 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2938 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2939 2940 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2941 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2942 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2943 cmd->logout_cid, conn->cid); 2944 2945 return 0; 2946 } 2947 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2948 2949 static int 2950 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2951 { 2952 int rc; 2953 2954 rc = iscsit_build_logout_rsp(cmd, conn, 2955 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2956 if (rc < 0) 2957 return rc; 2958 2959 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2960 } 2961 2962 void 2963 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2964 struct iscsi_nopin *hdr, bool nopout_response) 2965 { 2966 hdr->opcode = ISCSI_OP_NOOP_IN; 2967 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2968 hton24(hdr->dlength, cmd->buf_ptr_size); 2969 if (nopout_response) 2970 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2971 hdr->itt = cmd->init_task_tag; 2972 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2973 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2974 conn->stat_sn; 2975 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2976 2977 if (nopout_response) 2978 iscsit_increment_maxcmdsn(cmd, conn->sess); 2979 2980 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2981 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2982 2983 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2984 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2985 "Solicited" : "Unsolicited", cmd->init_task_tag, 2986 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2987 } 2988 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2989 2990 /* 2991 * Unsolicited NOPIN, either requesting a response or not. 2992 */ 2993 static int iscsit_send_unsolicited_nopin( 2994 struct iscsi_cmd *cmd, 2995 struct iscsi_conn *conn, 2996 int want_response) 2997 { 2998 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2999 int ret; 3000 3001 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3002 3003 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3004 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3005 3006 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3007 if (ret < 0) 3008 return ret; 3009 3010 spin_lock_bh(&cmd->istate_lock); 3011 cmd->i_state = want_response ? 3012 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3013 spin_unlock_bh(&cmd->istate_lock); 3014 3015 return 0; 3016 } 3017 3018 static int 3019 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3020 { 3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3022 3023 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3024 3025 /* 3026 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3027 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3028 */ 3029 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3030 3031 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3032 cmd->buf_ptr, 3033 cmd->buf_ptr_size); 3034 } 3035 3036 static int iscsit_send_r2t( 3037 struct iscsi_cmd *cmd, 3038 struct iscsi_conn *conn) 3039 { 3040 struct iscsi_r2t *r2t; 3041 struct iscsi_r2t_rsp *hdr; 3042 int ret; 3043 3044 r2t = iscsit_get_r2t_from_list(cmd); 3045 if (!r2t) 3046 return -1; 3047 3048 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3049 memset(hdr, 0, ISCSI_HDR_LEN); 3050 hdr->opcode = ISCSI_OP_R2T; 3051 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3052 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3053 (struct scsi_lun *)&hdr->lun); 3054 hdr->itt = cmd->init_task_tag; 3055 if (conn->conn_transport->iscsit_get_r2t_ttt) 3056 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3057 else 3058 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3059 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3060 hdr->statsn = cpu_to_be32(conn->stat_sn); 3061 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3062 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3063 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3064 hdr->data_offset = cpu_to_be32(r2t->offset); 3065 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3066 3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3071 r2t->offset, r2t->xfer_len, conn->cid); 3072 3073 spin_lock_bh(&cmd->r2t_lock); 3074 r2t->sent_r2t = 1; 3075 spin_unlock_bh(&cmd->r2t_lock); 3076 3077 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3078 if (ret < 0) { 3079 return ret; 3080 } 3081 3082 spin_lock_bh(&cmd->dataout_timeout_lock); 3083 iscsit_start_dataout_timer(cmd, conn); 3084 spin_unlock_bh(&cmd->dataout_timeout_lock); 3085 3086 return 0; 3087 } 3088 3089 /* 3090 * @recovery: If called from iscsi_task_reassign_complete_write() for 3091 * connection recovery. 3092 */ 3093 int iscsit_build_r2ts_for_cmd( 3094 struct iscsi_conn *conn, 3095 struct iscsi_cmd *cmd, 3096 bool recovery) 3097 { 3098 int first_r2t = 1; 3099 u32 offset = 0, xfer_len = 0; 3100 3101 spin_lock_bh(&cmd->r2t_lock); 3102 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3103 spin_unlock_bh(&cmd->r2t_lock); 3104 return 0; 3105 } 3106 3107 if (conn->sess->sess_ops->DataSequenceInOrder && 3108 !recovery) 3109 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3110 3111 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3112 if (conn->sess->sess_ops->DataSequenceInOrder) { 3113 offset = cmd->r2t_offset; 3114 3115 if (first_r2t && recovery) { 3116 int new_data_end = offset + 3117 conn->sess->sess_ops->MaxBurstLength - 3118 cmd->next_burst_len; 3119 3120 if (new_data_end > cmd->se_cmd.data_length) 3121 xfer_len = cmd->se_cmd.data_length - offset; 3122 else 3123 xfer_len = 3124 conn->sess->sess_ops->MaxBurstLength - 3125 cmd->next_burst_len; 3126 } else { 3127 int new_data_end = offset + 3128 conn->sess->sess_ops->MaxBurstLength; 3129 3130 if (new_data_end > cmd->se_cmd.data_length) 3131 xfer_len = cmd->se_cmd.data_length - offset; 3132 else 3133 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3134 } 3135 cmd->r2t_offset += xfer_len; 3136 3137 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3138 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3139 } else { 3140 struct iscsi_seq *seq; 3141 3142 seq = iscsit_get_seq_holder_for_r2t(cmd); 3143 if (!seq) { 3144 spin_unlock_bh(&cmd->r2t_lock); 3145 return -1; 3146 } 3147 3148 offset = seq->offset; 3149 xfer_len = seq->xfer_len; 3150 3151 if (cmd->seq_send_order == cmd->seq_count) 3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3153 } 3154 cmd->outstanding_r2ts++; 3155 first_r2t = 0; 3156 3157 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3158 spin_unlock_bh(&cmd->r2t_lock); 3159 return -1; 3160 } 3161 3162 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3163 break; 3164 } 3165 spin_unlock_bh(&cmd->r2t_lock); 3166 3167 return 0; 3168 } 3169 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3170 3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3172 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3173 { 3174 if (inc_stat_sn) 3175 cmd->stat_sn = conn->stat_sn++; 3176 3177 atomic_long_inc(&conn->sess->rsp_pdus); 3178 3179 memset(hdr, 0, ISCSI_HDR_LEN); 3180 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3181 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3182 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3183 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3184 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3185 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3186 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3188 } 3189 hdr->response = cmd->iscsi_response; 3190 hdr->cmd_status = cmd->se_cmd.scsi_status; 3191 hdr->itt = cmd->init_task_tag; 3192 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3193 3194 iscsit_increment_maxcmdsn(cmd, conn->sess); 3195 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3196 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3197 3198 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3199 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3200 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3201 cmd->se_cmd.scsi_status, conn->cid); 3202 } 3203 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3204 3205 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3206 { 3207 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3208 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3209 void *data_buf = NULL; 3210 u32 padding = 0, data_buf_len = 0; 3211 3212 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3213 3214 /* 3215 * Attach SENSE DATA payload to iSCSI Response PDU 3216 */ 3217 if (cmd->se_cmd.sense_buffer && 3218 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3219 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3220 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3221 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3222 3223 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3224 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3225 data_buf = cmd->sense_buffer; 3226 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3227 3228 if (padding) { 3229 memset(cmd->sense_buffer + 3230 cmd->se_cmd.scsi_sense_length, 0, padding); 3231 pr_debug("Adding %u bytes of padding to" 3232 " SENSE.\n", padding); 3233 } 3234 3235 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3236 " Response PDU\n", 3237 cmd->se_cmd.scsi_sense_length); 3238 } 3239 3240 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3241 data_buf_len); 3242 } 3243 3244 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3245 { 3246 switch (se_tmr->response) { 3247 case TMR_FUNCTION_COMPLETE: 3248 return ISCSI_TMF_RSP_COMPLETE; 3249 case TMR_TASK_DOES_NOT_EXIST: 3250 return ISCSI_TMF_RSP_NO_TASK; 3251 case TMR_LUN_DOES_NOT_EXIST: 3252 return ISCSI_TMF_RSP_NO_LUN; 3253 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3254 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3255 case TMR_FUNCTION_REJECTED: 3256 default: 3257 return ISCSI_TMF_RSP_REJECTED; 3258 } 3259 } 3260 3261 void 3262 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3263 struct iscsi_tm_rsp *hdr) 3264 { 3265 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3266 3267 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3268 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3269 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3270 hdr->itt = cmd->init_task_tag; 3271 cmd->stat_sn = conn->stat_sn++; 3272 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3273 3274 iscsit_increment_maxcmdsn(cmd, conn->sess); 3275 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3276 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3277 3278 pr_debug("Built Task Management Response ITT: 0x%08x," 3279 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3280 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3281 } 3282 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3283 3284 static int 3285 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3286 { 3287 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3288 3289 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3290 3291 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3292 } 3293 3294 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3295 { 3296 bool ret = false; 3297 3298 if (np->np_sockaddr.ss_family == AF_INET6) { 3299 const struct sockaddr_in6 sin6 = { 3300 .sin6_addr = IN6ADDR_ANY_INIT }; 3301 struct sockaddr_in6 *sock_in6 = 3302 (struct sockaddr_in6 *)&np->np_sockaddr; 3303 3304 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3305 sin6.sin6_addr.s6_addr, 16)) 3306 ret = true; 3307 } else { 3308 struct sockaddr_in * sock_in = 3309 (struct sockaddr_in *)&np->np_sockaddr; 3310 3311 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3312 ret = true; 3313 } 3314 3315 return ret; 3316 } 3317 3318 #define SENDTARGETS_BUF_LIMIT 32768U 3319 3320 static int 3321 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3322 enum iscsit_transport_type network_transport, 3323 int skip_bytes, bool *completed) 3324 { 3325 char *payload = NULL; 3326 struct iscsi_conn *conn = cmd->conn; 3327 struct iscsi_portal_group *tpg; 3328 struct iscsi_tiqn *tiqn; 3329 struct iscsi_tpg_np *tpg_np; 3330 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3331 int target_name_printed; 3332 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3333 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3334 bool active; 3335 3336 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3337 SENDTARGETS_BUF_LIMIT); 3338 3339 payload = kzalloc(buffer_len, GFP_KERNEL); 3340 if (!payload) 3341 return -ENOMEM; 3342 3343 /* 3344 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3345 * explicit case.. 3346 */ 3347 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3348 text_ptr = strchr(text_in, '='); 3349 if (!text_ptr) { 3350 pr_err("Unable to locate '=' string in text_in:" 3351 " %s\n", text_in); 3352 kfree(payload); 3353 return -EINVAL; 3354 } 3355 /* 3356 * Skip over '=' character.. 3357 */ 3358 text_ptr += 1; 3359 } 3360 3361 spin_lock(&tiqn_lock); 3362 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3363 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3364 strcmp(tiqn->tiqn, text_ptr)) { 3365 continue; 3366 } 3367 3368 target_name_printed = 0; 3369 3370 spin_lock(&tiqn->tiqn_tpg_lock); 3371 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3372 3373 /* If demo_mode_discovery=0 and generate_node_acls=0 3374 * (demo mode dislabed) do not return 3375 * TargetName+TargetAddress unless a NodeACL exists. 3376 */ 3377 3378 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3379 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3380 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3381 cmd->conn->sess->sess_ops->InitiatorName))) { 3382 continue; 3383 } 3384 3385 spin_lock(&tpg->tpg_state_lock); 3386 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3387 spin_unlock(&tpg->tpg_state_lock); 3388 3389 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3390 continue; 3391 3392 spin_lock(&tpg->tpg_np_lock); 3393 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3394 tpg_np_list) { 3395 struct iscsi_np *np = tpg_np->tpg_np; 3396 bool inaddr_any = iscsit_check_inaddr_any(np); 3397 struct sockaddr_storage *sockaddr; 3398 3399 if (np->np_network_transport != network_transport) 3400 continue; 3401 3402 if (!target_name_printed) { 3403 len = sprintf(buf, "TargetName=%s", 3404 tiqn->tiqn); 3405 len += 1; 3406 3407 if ((len + payload_len) > buffer_len) { 3408 spin_unlock(&tpg->tpg_np_lock); 3409 spin_unlock(&tiqn->tiqn_tpg_lock); 3410 end_of_buf = 1; 3411 goto eob; 3412 } 3413 3414 if (skip_bytes && len <= skip_bytes) { 3415 skip_bytes -= len; 3416 } else { 3417 memcpy(payload + payload_len, buf, len); 3418 payload_len += len; 3419 target_name_printed = 1; 3420 if (len > skip_bytes) 3421 skip_bytes = 0; 3422 } 3423 } 3424 3425 if (inaddr_any) 3426 sockaddr = &conn->local_sockaddr; 3427 else 3428 sockaddr = &np->np_sockaddr; 3429 3430 len = sprintf(buf, "TargetAddress=" 3431 "%pISpc,%hu", 3432 sockaddr, 3433 tpg->tpgt); 3434 len += 1; 3435 3436 if ((len + payload_len) > buffer_len) { 3437 spin_unlock(&tpg->tpg_np_lock); 3438 spin_unlock(&tiqn->tiqn_tpg_lock); 3439 end_of_buf = 1; 3440 goto eob; 3441 } 3442 3443 if (skip_bytes && len <= skip_bytes) { 3444 skip_bytes -= len; 3445 } else { 3446 memcpy(payload + payload_len, buf, len); 3447 payload_len += len; 3448 if (len > skip_bytes) 3449 skip_bytes = 0; 3450 } 3451 } 3452 spin_unlock(&tpg->tpg_np_lock); 3453 } 3454 spin_unlock(&tiqn->tiqn_tpg_lock); 3455 eob: 3456 if (end_of_buf) { 3457 *completed = false; 3458 break; 3459 } 3460 3461 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3462 break; 3463 } 3464 spin_unlock(&tiqn_lock); 3465 3466 cmd->buf_ptr = payload; 3467 3468 return payload_len; 3469 } 3470 3471 int 3472 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3473 struct iscsi_text_rsp *hdr, 3474 enum iscsit_transport_type network_transport) 3475 { 3476 int text_length, padding; 3477 bool completed = true; 3478 3479 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3480 cmd->read_data_done, 3481 &completed); 3482 if (text_length < 0) 3483 return text_length; 3484 3485 if (completed) { 3486 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3487 } else { 3488 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3489 cmd->read_data_done += text_length; 3490 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3491 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3492 } 3493 hdr->opcode = ISCSI_OP_TEXT_RSP; 3494 padding = ((-text_length) & 3); 3495 hton24(hdr->dlength, text_length); 3496 hdr->itt = cmd->init_task_tag; 3497 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3498 cmd->stat_sn = conn->stat_sn++; 3499 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3500 3501 iscsit_increment_maxcmdsn(cmd, conn->sess); 3502 /* 3503 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3504 * correctly increment MaxCmdSN for each response answering a 3505 * non immediate text request with a valid CmdSN. 3506 */ 3507 cmd->maxcmdsn_inc = 0; 3508 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3509 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3510 3511 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3512 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3513 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3514 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3515 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3516 3517 return text_length + padding; 3518 } 3519 EXPORT_SYMBOL(iscsit_build_text_rsp); 3520 3521 static int iscsit_send_text_rsp( 3522 struct iscsi_cmd *cmd, 3523 struct iscsi_conn *conn) 3524 { 3525 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3526 int text_length; 3527 3528 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3529 conn->conn_transport->transport_type); 3530 if (text_length < 0) 3531 return text_length; 3532 3533 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3534 cmd->buf_ptr, 3535 text_length); 3536 } 3537 3538 void 3539 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3540 struct iscsi_reject *hdr) 3541 { 3542 hdr->opcode = ISCSI_OP_REJECT; 3543 hdr->reason = cmd->reject_reason; 3544 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3545 hton24(hdr->dlength, ISCSI_HDR_LEN); 3546 hdr->ffffffff = cpu_to_be32(0xffffffff); 3547 cmd->stat_sn = conn->stat_sn++; 3548 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3549 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3550 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3551 3552 } 3553 EXPORT_SYMBOL(iscsit_build_reject); 3554 3555 static int iscsit_send_reject( 3556 struct iscsi_cmd *cmd, 3557 struct iscsi_conn *conn) 3558 { 3559 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3560 3561 iscsit_build_reject(cmd, conn, hdr); 3562 3563 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3564 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3565 3566 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3567 cmd->buf_ptr, 3568 ISCSI_HDR_LEN); 3569 } 3570 3571 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3572 { 3573 int ord, cpu; 3574 /* 3575 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3576 * within iscsit_start_kthreads() 3577 * 3578 * Here we use bitmap_id to determine which CPU that this 3579 * iSCSI connection's RX/TX threads will be scheduled to 3580 * execute upon. 3581 */ 3582 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3583 for_each_online_cpu(cpu) { 3584 if (ord-- == 0) { 3585 cpumask_set_cpu(cpu, conn->conn_cpumask); 3586 return; 3587 } 3588 } 3589 /* 3590 * This should never be reached.. 3591 */ 3592 dump_stack(); 3593 cpumask_setall(conn->conn_cpumask); 3594 } 3595 3596 int 3597 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3598 { 3599 int ret; 3600 3601 switch (state) { 3602 case ISTATE_SEND_R2T: 3603 ret = iscsit_send_r2t(cmd, conn); 3604 if (ret < 0) 3605 goto err; 3606 break; 3607 case ISTATE_REMOVE: 3608 spin_lock_bh(&conn->cmd_lock); 3609 list_del_init(&cmd->i_conn_node); 3610 spin_unlock_bh(&conn->cmd_lock); 3611 3612 iscsit_free_cmd(cmd, false); 3613 break; 3614 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3615 iscsit_mod_nopin_response_timer(conn); 3616 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3617 if (ret < 0) 3618 goto err; 3619 break; 3620 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3621 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3622 if (ret < 0) 3623 goto err; 3624 break; 3625 default: 3626 pr_err("Unknown Opcode: 0x%02x ITT:" 3627 " 0x%08x, i_state: %d on CID: %hu\n", 3628 cmd->iscsi_opcode, cmd->init_task_tag, state, 3629 conn->cid); 3630 goto err; 3631 } 3632 3633 return 0; 3634 3635 err: 3636 return -1; 3637 } 3638 EXPORT_SYMBOL(iscsit_immediate_queue); 3639 3640 static int 3641 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3642 { 3643 struct iscsit_transport *t = conn->conn_transport; 3644 struct iscsi_queue_req *qr; 3645 struct iscsi_cmd *cmd; 3646 u8 state; 3647 int ret; 3648 3649 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3650 atomic_set(&conn->check_immediate_queue, 0); 3651 cmd = qr->cmd; 3652 state = qr->state; 3653 kmem_cache_free(lio_qr_cache, qr); 3654 3655 ret = t->iscsit_immediate_queue(conn, cmd, state); 3656 if (ret < 0) 3657 return ret; 3658 } 3659 3660 return 0; 3661 } 3662 3663 int 3664 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3665 { 3666 int ret; 3667 3668 check_rsp_state: 3669 switch (state) { 3670 case ISTATE_SEND_DATAIN: 3671 ret = iscsit_send_datain(cmd, conn); 3672 if (ret < 0) 3673 goto err; 3674 else if (!ret) 3675 /* more drs */ 3676 goto check_rsp_state; 3677 else if (ret == 1) { 3678 /* all done */ 3679 spin_lock_bh(&cmd->istate_lock); 3680 cmd->i_state = ISTATE_SENT_STATUS; 3681 spin_unlock_bh(&cmd->istate_lock); 3682 3683 if (atomic_read(&conn->check_immediate_queue)) 3684 return 1; 3685 3686 return 0; 3687 } else if (ret == 2) { 3688 /* Still must send status, 3689 SCF_TRANSPORT_TASK_SENSE was set */ 3690 spin_lock_bh(&cmd->istate_lock); 3691 cmd->i_state = ISTATE_SEND_STATUS; 3692 spin_unlock_bh(&cmd->istate_lock); 3693 state = ISTATE_SEND_STATUS; 3694 goto check_rsp_state; 3695 } 3696 3697 break; 3698 case ISTATE_SEND_STATUS: 3699 case ISTATE_SEND_STATUS_RECOVERY: 3700 ret = iscsit_send_response(cmd, conn); 3701 break; 3702 case ISTATE_SEND_LOGOUTRSP: 3703 ret = iscsit_send_logout(cmd, conn); 3704 break; 3705 case ISTATE_SEND_ASYNCMSG: 3706 ret = iscsit_send_conn_drop_async_message( 3707 cmd, conn); 3708 break; 3709 case ISTATE_SEND_NOPIN: 3710 ret = iscsit_send_nopin(cmd, conn); 3711 break; 3712 case ISTATE_SEND_REJECT: 3713 ret = iscsit_send_reject(cmd, conn); 3714 break; 3715 case ISTATE_SEND_TASKMGTRSP: 3716 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3717 if (ret != 0) 3718 break; 3719 ret = iscsit_tmr_post_handler(cmd, conn); 3720 if (ret != 0) 3721 iscsit_fall_back_to_erl0(conn->sess); 3722 break; 3723 case ISTATE_SEND_TEXTRSP: 3724 ret = iscsit_send_text_rsp(cmd, conn); 3725 break; 3726 default: 3727 pr_err("Unknown Opcode: 0x%02x ITT:" 3728 " 0x%08x, i_state: %d on CID: %hu\n", 3729 cmd->iscsi_opcode, cmd->init_task_tag, 3730 state, conn->cid); 3731 goto err; 3732 } 3733 if (ret < 0) 3734 goto err; 3735 3736 switch (state) { 3737 case ISTATE_SEND_LOGOUTRSP: 3738 if (!iscsit_logout_post_handler(cmd, conn)) 3739 return -ECONNRESET; 3740 /* fall through */ 3741 case ISTATE_SEND_STATUS: 3742 case ISTATE_SEND_ASYNCMSG: 3743 case ISTATE_SEND_NOPIN: 3744 case ISTATE_SEND_STATUS_RECOVERY: 3745 case ISTATE_SEND_TEXTRSP: 3746 case ISTATE_SEND_TASKMGTRSP: 3747 case ISTATE_SEND_REJECT: 3748 spin_lock_bh(&cmd->istate_lock); 3749 cmd->i_state = ISTATE_SENT_STATUS; 3750 spin_unlock_bh(&cmd->istate_lock); 3751 break; 3752 default: 3753 pr_err("Unknown Opcode: 0x%02x ITT:" 3754 " 0x%08x, i_state: %d on CID: %hu\n", 3755 cmd->iscsi_opcode, cmd->init_task_tag, 3756 cmd->i_state, conn->cid); 3757 goto err; 3758 } 3759 3760 if (atomic_read(&conn->check_immediate_queue)) 3761 return 1; 3762 3763 return 0; 3764 3765 err: 3766 return -1; 3767 } 3768 EXPORT_SYMBOL(iscsit_response_queue); 3769 3770 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3771 { 3772 struct iscsit_transport *t = conn->conn_transport; 3773 struct iscsi_queue_req *qr; 3774 struct iscsi_cmd *cmd; 3775 u8 state; 3776 int ret; 3777 3778 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3779 cmd = qr->cmd; 3780 state = qr->state; 3781 kmem_cache_free(lio_qr_cache, qr); 3782 3783 ret = t->iscsit_response_queue(conn, cmd, state); 3784 if (ret == 1 || ret < 0) 3785 return ret; 3786 } 3787 3788 return 0; 3789 } 3790 3791 int iscsi_target_tx_thread(void *arg) 3792 { 3793 int ret = 0; 3794 struct iscsi_conn *conn = arg; 3795 bool conn_freed = false; 3796 3797 /* 3798 * Allow ourselves to be interrupted by SIGINT so that a 3799 * connection recovery / failure event can be triggered externally. 3800 */ 3801 allow_signal(SIGINT); 3802 3803 while (!kthread_should_stop()) { 3804 /* 3805 * Ensure that both TX and RX per connection kthreads 3806 * are scheduled to run on the same CPU. 3807 */ 3808 iscsit_thread_check_cpumask(conn, current, 1); 3809 3810 wait_event_interruptible(conn->queues_wq, 3811 !iscsit_conn_all_queues_empty(conn)); 3812 3813 if (signal_pending(current)) 3814 goto transport_err; 3815 3816 get_immediate: 3817 ret = iscsit_handle_immediate_queue(conn); 3818 if (ret < 0) 3819 goto transport_err; 3820 3821 ret = iscsit_handle_response_queue(conn); 3822 if (ret == 1) { 3823 goto get_immediate; 3824 } else if (ret == -ECONNRESET) { 3825 conn_freed = true; 3826 goto out; 3827 } else if (ret < 0) { 3828 goto transport_err; 3829 } 3830 } 3831 3832 transport_err: 3833 /* 3834 * Avoid the normal connection failure code-path if this connection 3835 * is still within LOGIN mode, and iscsi_np process context is 3836 * responsible for cleaning up the early connection failure. 3837 */ 3838 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3839 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3840 out: 3841 if (!conn_freed) { 3842 while (!kthread_should_stop()) { 3843 msleep(100); 3844 } 3845 } 3846 return 0; 3847 } 3848 3849 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3850 { 3851 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3852 struct iscsi_cmd *cmd; 3853 int ret = 0; 3854 3855 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3856 case ISCSI_OP_SCSI_CMD: 3857 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3858 if (!cmd) 3859 goto reject; 3860 3861 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3862 break; 3863 case ISCSI_OP_SCSI_DATA_OUT: 3864 ret = iscsit_handle_data_out(conn, buf); 3865 break; 3866 case ISCSI_OP_NOOP_OUT: 3867 cmd = NULL; 3868 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3870 if (!cmd) 3871 goto reject; 3872 } 3873 ret = iscsit_handle_nop_out(conn, cmd, buf); 3874 break; 3875 case ISCSI_OP_SCSI_TMFUNC: 3876 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3877 if (!cmd) 3878 goto reject; 3879 3880 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3881 break; 3882 case ISCSI_OP_TEXT: 3883 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3884 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3885 if (!cmd) 3886 goto reject; 3887 } else { 3888 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3889 if (!cmd) 3890 goto reject; 3891 } 3892 3893 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3894 break; 3895 case ISCSI_OP_LOGOUT: 3896 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3897 if (!cmd) 3898 goto reject; 3899 3900 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3901 if (ret > 0) 3902 wait_for_completion_timeout(&conn->conn_logout_comp, 3903 SECONDS_FOR_LOGOUT_COMP * HZ); 3904 break; 3905 case ISCSI_OP_SNACK: 3906 ret = iscsit_handle_snack(conn, buf); 3907 break; 3908 default: 3909 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3910 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3911 pr_err("Cannot recover from unknown" 3912 " opcode while ERL=0, closing iSCSI connection.\n"); 3913 return -1; 3914 } 3915 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3916 " closing iSCSI connection.\n"); 3917 ret = -1; 3918 break; 3919 } 3920 3921 return ret; 3922 reject: 3923 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3924 } 3925 3926 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3927 { 3928 bool ret; 3929 3930 spin_lock_bh(&conn->state_lock); 3931 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3932 spin_unlock_bh(&conn->state_lock); 3933 3934 return ret; 3935 } 3936 3937 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3938 { 3939 int ret; 3940 u8 buffer[ISCSI_HDR_LEN], opcode; 3941 u32 checksum = 0, digest = 0; 3942 struct kvec iov; 3943 3944 while (!kthread_should_stop()) { 3945 /* 3946 * Ensure that both TX and RX per connection kthreads 3947 * are scheduled to run on the same CPU. 3948 */ 3949 iscsit_thread_check_cpumask(conn, current, 0); 3950 3951 memset(buffer, 0, ISCSI_HDR_LEN); 3952 memset(&iov, 0, sizeof(struct kvec)); 3953 3954 iov.iov_base = buffer; 3955 iov.iov_len = ISCSI_HDR_LEN; 3956 3957 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3958 if (ret != ISCSI_HDR_LEN) { 3959 iscsit_rx_thread_wait_for_tcp(conn); 3960 return; 3961 } 3962 3963 if (conn->conn_ops->HeaderDigest) { 3964 iov.iov_base = &digest; 3965 iov.iov_len = ISCSI_CRC_LEN; 3966 3967 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3968 if (ret != ISCSI_CRC_LEN) { 3969 iscsit_rx_thread_wait_for_tcp(conn); 3970 return; 3971 } 3972 3973 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3974 ISCSI_HDR_LEN, 0, NULL, 3975 &checksum); 3976 3977 if (digest != checksum) { 3978 pr_err("HeaderDigest CRC32C failed," 3979 " received 0x%08x, computed 0x%08x\n", 3980 digest, checksum); 3981 /* 3982 * Set the PDU to 0xff so it will intentionally 3983 * hit default in the switch below. 3984 */ 3985 memset(buffer, 0xff, ISCSI_HDR_LEN); 3986 atomic_long_inc(&conn->sess->conn_digest_errors); 3987 } else { 3988 pr_debug("Got HeaderDigest CRC32C" 3989 " 0x%08x\n", checksum); 3990 } 3991 } 3992 3993 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3994 return; 3995 3996 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3997 3998 if (conn->sess->sess_ops->SessionType && 3999 ((!(opcode & ISCSI_OP_TEXT)) || 4000 (!(opcode & ISCSI_OP_LOGOUT)))) { 4001 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4002 " while in Discovery Session, rejecting.\n", opcode); 4003 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4004 buffer); 4005 return; 4006 } 4007 4008 ret = iscsi_target_rx_opcode(conn, buffer); 4009 if (ret < 0) 4010 return; 4011 } 4012 } 4013 4014 int iscsi_target_rx_thread(void *arg) 4015 { 4016 int rc; 4017 struct iscsi_conn *conn = arg; 4018 bool conn_freed = false; 4019 4020 /* 4021 * Allow ourselves to be interrupted by SIGINT so that a 4022 * connection recovery / failure event can be triggered externally. 4023 */ 4024 allow_signal(SIGINT); 4025 /* 4026 * Wait for iscsi_post_login_handler() to complete before allowing 4027 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4028 */ 4029 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4030 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4031 goto out; 4032 4033 if (!conn->conn_transport->iscsit_get_rx_pdu) 4034 return 0; 4035 4036 conn->conn_transport->iscsit_get_rx_pdu(conn); 4037 4038 if (!signal_pending(current)) 4039 atomic_set(&conn->transport_failed, 1); 4040 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4041 4042 out: 4043 if (!conn_freed) { 4044 while (!kthread_should_stop()) { 4045 msleep(100); 4046 } 4047 } 4048 4049 return 0; 4050 } 4051 4052 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4053 { 4054 LIST_HEAD(tmp_list); 4055 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4056 struct iscsi_session *sess = conn->sess; 4057 /* 4058 * We expect this function to only ever be called from either RX or TX 4059 * thread context via iscsit_close_connection() once the other context 4060 * has been reset -> returned sleeping pre-handler state. 4061 */ 4062 spin_lock_bh(&conn->cmd_lock); 4063 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4064 4065 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4066 struct se_cmd *se_cmd = &cmd->se_cmd; 4067 4068 if (se_cmd->se_tfo != NULL) { 4069 spin_lock(&se_cmd->t_state_lock); 4070 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4071 spin_unlock(&se_cmd->t_state_lock); 4072 } 4073 } 4074 spin_unlock_bh(&conn->cmd_lock); 4075 4076 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4077 list_del_init(&cmd->i_conn_node); 4078 4079 iscsit_increment_maxcmdsn(cmd, sess); 4080 iscsit_free_cmd(cmd, true); 4081 4082 } 4083 } 4084 4085 static void iscsit_stop_timers_for_cmds( 4086 struct iscsi_conn *conn) 4087 { 4088 struct iscsi_cmd *cmd; 4089 4090 spin_lock_bh(&conn->cmd_lock); 4091 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4092 if (cmd->data_direction == DMA_TO_DEVICE) 4093 iscsit_stop_dataout_timer(cmd); 4094 } 4095 spin_unlock_bh(&conn->cmd_lock); 4096 } 4097 4098 int iscsit_close_connection( 4099 struct iscsi_conn *conn) 4100 { 4101 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4102 struct iscsi_session *sess = conn->sess; 4103 4104 pr_debug("Closing iSCSI connection CID %hu on SID:" 4105 " %u\n", conn->cid, sess->sid); 4106 /* 4107 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4108 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4109 * sleeping and the logout response never got sent because the 4110 * connection failed. 4111 * 4112 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4113 * to signal logout response TX interrupt completion. Go ahead and skip 4114 * this for iser since isert_rx_opcode() does not wait on logout failure, 4115 * and to avoid iscsi_conn pointer dereference in iser-target code. 4116 */ 4117 if (!conn->conn_transport->rdma_shutdown) 4118 complete(&conn->conn_logout_comp); 4119 4120 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4121 if (conn->tx_thread && 4122 cmpxchg(&conn->tx_thread_active, true, false)) { 4123 send_sig(SIGINT, conn->tx_thread, 1); 4124 kthread_stop(conn->tx_thread); 4125 } 4126 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4127 if (conn->rx_thread && 4128 cmpxchg(&conn->rx_thread_active, true, false)) { 4129 send_sig(SIGINT, conn->rx_thread, 1); 4130 kthread_stop(conn->rx_thread); 4131 } 4132 } 4133 4134 spin_lock(&iscsit_global->ts_bitmap_lock); 4135 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4136 get_order(1)); 4137 spin_unlock(&iscsit_global->ts_bitmap_lock); 4138 4139 iscsit_stop_timers_for_cmds(conn); 4140 iscsit_stop_nopin_response_timer(conn); 4141 iscsit_stop_nopin_timer(conn); 4142 4143 if (conn->conn_transport->iscsit_wait_conn) 4144 conn->conn_transport->iscsit_wait_conn(conn); 4145 4146 /* 4147 * During Connection recovery drop unacknowledged out of order 4148 * commands for this connection, and prepare the other commands 4149 * for reallegiance. 4150 * 4151 * During normal operation clear the out of order commands (but 4152 * do not free the struct iscsi_ooo_cmdsn's) and release all 4153 * struct iscsi_cmds. 4154 */ 4155 if (atomic_read(&conn->connection_recovery)) { 4156 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4157 iscsit_prepare_cmds_for_reallegiance(conn); 4158 } else { 4159 iscsit_clear_ooo_cmdsns_for_conn(conn); 4160 iscsit_release_commands_from_conn(conn); 4161 } 4162 iscsit_free_queue_reqs_for_conn(conn); 4163 4164 /* 4165 * Handle decrementing session or connection usage count if 4166 * a logout response was not able to be sent because the 4167 * connection failed. Fall back to Session Recovery here. 4168 */ 4169 if (atomic_read(&conn->conn_logout_remove)) { 4170 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4171 iscsit_dec_conn_usage_count(conn); 4172 iscsit_dec_session_usage_count(sess); 4173 } 4174 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4175 iscsit_dec_conn_usage_count(conn); 4176 4177 atomic_set(&conn->conn_logout_remove, 0); 4178 atomic_set(&sess->session_reinstatement, 0); 4179 atomic_set(&sess->session_fall_back_to_erl0, 1); 4180 } 4181 4182 spin_lock_bh(&sess->conn_lock); 4183 list_del(&conn->conn_list); 4184 4185 /* 4186 * Attempt to let the Initiator know this connection failed by 4187 * sending an Connection Dropped Async Message on another 4188 * active connection. 4189 */ 4190 if (atomic_read(&conn->connection_recovery)) 4191 iscsit_build_conn_drop_async_message(conn); 4192 4193 spin_unlock_bh(&sess->conn_lock); 4194 4195 /* 4196 * If connection reinstatement is being performed on this connection, 4197 * up the connection reinstatement semaphore that is being blocked on 4198 * in iscsit_cause_connection_reinstatement(). 4199 */ 4200 spin_lock_bh(&conn->state_lock); 4201 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4202 spin_unlock_bh(&conn->state_lock); 4203 complete(&conn->conn_wait_comp); 4204 wait_for_completion(&conn->conn_post_wait_comp); 4205 spin_lock_bh(&conn->state_lock); 4206 } 4207 4208 /* 4209 * If connection reinstatement is being performed on this connection 4210 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4211 * connection wait rcfr semaphore that is being blocked on 4212 * an iscsit_connection_reinstatement_rcfr(). 4213 */ 4214 if (atomic_read(&conn->connection_wait_rcfr)) { 4215 spin_unlock_bh(&conn->state_lock); 4216 complete(&conn->conn_wait_rcfr_comp); 4217 wait_for_completion(&conn->conn_post_wait_comp); 4218 spin_lock_bh(&conn->state_lock); 4219 } 4220 atomic_set(&conn->connection_reinstatement, 1); 4221 spin_unlock_bh(&conn->state_lock); 4222 4223 /* 4224 * If any other processes are accessing this connection pointer we 4225 * must wait until they have completed. 4226 */ 4227 iscsit_check_conn_usage_count(conn); 4228 4229 ahash_request_free(conn->conn_tx_hash); 4230 if (conn->conn_rx_hash) { 4231 struct crypto_ahash *tfm; 4232 4233 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4234 ahash_request_free(conn->conn_rx_hash); 4235 crypto_free_ahash(tfm); 4236 } 4237 4238 free_cpumask_var(conn->conn_cpumask); 4239 4240 kfree(conn->conn_ops); 4241 conn->conn_ops = NULL; 4242 4243 if (conn->sock) 4244 sock_release(conn->sock); 4245 4246 if (conn->conn_transport->iscsit_free_conn) 4247 conn->conn_transport->iscsit_free_conn(conn); 4248 4249 iscsit_put_transport(conn->conn_transport); 4250 4251 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4252 conn->conn_state = TARG_CONN_STATE_FREE; 4253 kfree(conn); 4254 4255 spin_lock_bh(&sess->conn_lock); 4256 atomic_dec(&sess->nconn); 4257 pr_debug("Decremented iSCSI connection count to %hu from node:" 4258 " %s\n", atomic_read(&sess->nconn), 4259 sess->sess_ops->InitiatorName); 4260 /* 4261 * Make sure that if one connection fails in an non ERL=2 iSCSI 4262 * Session that they all fail. 4263 */ 4264 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4265 !atomic_read(&sess->session_logout)) 4266 atomic_set(&sess->session_fall_back_to_erl0, 1); 4267 4268 /* 4269 * If this was not the last connection in the session, and we are 4270 * performing session reinstatement or falling back to ERL=0, call 4271 * iscsit_stop_session() without sleeping to shutdown the other 4272 * active connections. 4273 */ 4274 if (atomic_read(&sess->nconn)) { 4275 if (!atomic_read(&sess->session_reinstatement) && 4276 !atomic_read(&sess->session_fall_back_to_erl0)) { 4277 spin_unlock_bh(&sess->conn_lock); 4278 return 0; 4279 } 4280 if (!atomic_read(&sess->session_stop_active)) { 4281 atomic_set(&sess->session_stop_active, 1); 4282 spin_unlock_bh(&sess->conn_lock); 4283 iscsit_stop_session(sess, 0, 0); 4284 return 0; 4285 } 4286 spin_unlock_bh(&sess->conn_lock); 4287 return 0; 4288 } 4289 4290 /* 4291 * If this was the last connection in the session and one of the 4292 * following is occurring: 4293 * 4294 * Session Reinstatement is not being performed, and are falling back 4295 * to ERL=0 call iscsit_close_session(). 4296 * 4297 * Session Logout was requested. iscsit_close_session() will be called 4298 * elsewhere. 4299 * 4300 * Session Continuation is not being performed, start the Time2Retain 4301 * handler and check if sleep_on_sess_wait_sem is active. 4302 */ 4303 if (!atomic_read(&sess->session_reinstatement) && 4304 atomic_read(&sess->session_fall_back_to_erl0)) { 4305 spin_unlock_bh(&sess->conn_lock); 4306 iscsit_close_session(sess); 4307 4308 return 0; 4309 } else if (atomic_read(&sess->session_logout)) { 4310 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4311 sess->session_state = TARG_SESS_STATE_FREE; 4312 spin_unlock_bh(&sess->conn_lock); 4313 4314 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4315 complete(&sess->session_wait_comp); 4316 4317 return 0; 4318 } else { 4319 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4320 sess->session_state = TARG_SESS_STATE_FAILED; 4321 4322 if (!atomic_read(&sess->session_continuation)) { 4323 spin_unlock_bh(&sess->conn_lock); 4324 iscsit_start_time2retain_handler(sess); 4325 } else 4326 spin_unlock_bh(&sess->conn_lock); 4327 4328 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4329 complete(&sess->session_wait_comp); 4330 4331 return 0; 4332 } 4333 } 4334 4335 /* 4336 * If the iSCSI Session for the iSCSI Initiator Node exists, 4337 * forcefully shutdown the iSCSI NEXUS. 4338 */ 4339 int iscsit_close_session(struct iscsi_session *sess) 4340 { 4341 struct iscsi_portal_group *tpg = sess->tpg; 4342 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4343 4344 if (atomic_read(&sess->nconn)) { 4345 pr_err("%d connection(s) still exist for iSCSI session" 4346 " to %s\n", atomic_read(&sess->nconn), 4347 sess->sess_ops->InitiatorName); 4348 BUG(); 4349 } 4350 4351 spin_lock_bh(&se_tpg->session_lock); 4352 atomic_set(&sess->session_logout, 1); 4353 atomic_set(&sess->session_reinstatement, 1); 4354 iscsit_stop_time2retain_timer(sess); 4355 spin_unlock_bh(&se_tpg->session_lock); 4356 4357 /* 4358 * transport_deregister_session_configfs() will clear the 4359 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4360 * can be setting it again with __transport_register_session() in 4361 * iscsi_post_login_handler() again after the iscsit_stop_session() 4362 * completes in iscsi_np context. 4363 */ 4364 transport_deregister_session_configfs(sess->se_sess); 4365 4366 /* 4367 * If any other processes are accessing this session pointer we must 4368 * wait until they have completed. If we are in an interrupt (the 4369 * time2retain handler) and contain and active session usage count we 4370 * restart the timer and exit. 4371 */ 4372 if (!in_interrupt()) { 4373 if (iscsit_check_session_usage_count(sess) == 1) 4374 iscsit_stop_session(sess, 1, 1); 4375 } else { 4376 if (iscsit_check_session_usage_count(sess) == 2) { 4377 atomic_set(&sess->session_logout, 0); 4378 iscsit_start_time2retain_handler(sess); 4379 return 0; 4380 } 4381 } 4382 4383 transport_deregister_session(sess->se_sess); 4384 4385 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4386 iscsit_free_connection_recovery_entires(sess); 4387 4388 iscsit_free_all_ooo_cmdsns(sess); 4389 4390 spin_lock_bh(&se_tpg->session_lock); 4391 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4392 sess->session_state = TARG_SESS_STATE_FREE; 4393 pr_debug("Released iSCSI session from node: %s\n", 4394 sess->sess_ops->InitiatorName); 4395 tpg->nsessions--; 4396 if (tpg->tpg_tiqn) 4397 tpg->tpg_tiqn->tiqn_nsessions--; 4398 4399 pr_debug("Decremented number of active iSCSI Sessions on" 4400 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4401 4402 spin_lock(&sess_idr_lock); 4403 idr_remove(&sess_idr, sess->session_index); 4404 spin_unlock(&sess_idr_lock); 4405 4406 kfree(sess->sess_ops); 4407 sess->sess_ops = NULL; 4408 spin_unlock_bh(&se_tpg->session_lock); 4409 4410 kfree(sess); 4411 return 0; 4412 } 4413 4414 static void iscsit_logout_post_handler_closesession( 4415 struct iscsi_conn *conn) 4416 { 4417 struct iscsi_session *sess = conn->sess; 4418 int sleep = 1; 4419 /* 4420 * Traditional iscsi/tcp will invoke this logic from TX thread 4421 * context during session logout, so clear tx_thread_active and 4422 * sleep if iscsit_close_connection() has not already occured. 4423 * 4424 * Since iser-target invokes this logic from it's own workqueue, 4425 * always sleep waiting for RX/TX thread shutdown to complete 4426 * within iscsit_close_connection(). 4427 */ 4428 if (!conn->conn_transport->rdma_shutdown) { 4429 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4430 if (!sleep) 4431 return; 4432 } 4433 4434 atomic_set(&conn->conn_logout_remove, 0); 4435 complete(&conn->conn_logout_comp); 4436 4437 iscsit_dec_conn_usage_count(conn); 4438 iscsit_stop_session(sess, sleep, sleep); 4439 iscsit_dec_session_usage_count(sess); 4440 iscsit_close_session(sess); 4441 } 4442 4443 static void iscsit_logout_post_handler_samecid( 4444 struct iscsi_conn *conn) 4445 { 4446 int sleep = 1; 4447 4448 if (!conn->conn_transport->rdma_shutdown) { 4449 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4450 if (!sleep) 4451 return; 4452 } 4453 4454 atomic_set(&conn->conn_logout_remove, 0); 4455 complete(&conn->conn_logout_comp); 4456 4457 iscsit_cause_connection_reinstatement(conn, sleep); 4458 iscsit_dec_conn_usage_count(conn); 4459 } 4460 4461 static void iscsit_logout_post_handler_diffcid( 4462 struct iscsi_conn *conn, 4463 u16 cid) 4464 { 4465 struct iscsi_conn *l_conn; 4466 struct iscsi_session *sess = conn->sess; 4467 bool conn_found = false; 4468 4469 if (!sess) 4470 return; 4471 4472 spin_lock_bh(&sess->conn_lock); 4473 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4474 if (l_conn->cid == cid) { 4475 iscsit_inc_conn_usage_count(l_conn); 4476 conn_found = true; 4477 break; 4478 } 4479 } 4480 spin_unlock_bh(&sess->conn_lock); 4481 4482 if (!conn_found) 4483 return; 4484 4485 if (l_conn->sock) 4486 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4487 4488 spin_lock_bh(&l_conn->state_lock); 4489 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4490 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4491 spin_unlock_bh(&l_conn->state_lock); 4492 4493 iscsit_cause_connection_reinstatement(l_conn, 1); 4494 iscsit_dec_conn_usage_count(l_conn); 4495 } 4496 4497 /* 4498 * Return of 0 causes the TX thread to restart. 4499 */ 4500 int iscsit_logout_post_handler( 4501 struct iscsi_cmd *cmd, 4502 struct iscsi_conn *conn) 4503 { 4504 int ret = 0; 4505 4506 switch (cmd->logout_reason) { 4507 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4508 switch (cmd->logout_response) { 4509 case ISCSI_LOGOUT_SUCCESS: 4510 case ISCSI_LOGOUT_CLEANUP_FAILED: 4511 default: 4512 iscsit_logout_post_handler_closesession(conn); 4513 break; 4514 } 4515 ret = 0; 4516 break; 4517 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4518 if (conn->cid == cmd->logout_cid) { 4519 switch (cmd->logout_response) { 4520 case ISCSI_LOGOUT_SUCCESS: 4521 case ISCSI_LOGOUT_CLEANUP_FAILED: 4522 default: 4523 iscsit_logout_post_handler_samecid(conn); 4524 break; 4525 } 4526 ret = 0; 4527 } else { 4528 switch (cmd->logout_response) { 4529 case ISCSI_LOGOUT_SUCCESS: 4530 iscsit_logout_post_handler_diffcid(conn, 4531 cmd->logout_cid); 4532 break; 4533 case ISCSI_LOGOUT_CID_NOT_FOUND: 4534 case ISCSI_LOGOUT_CLEANUP_FAILED: 4535 default: 4536 break; 4537 } 4538 ret = 1; 4539 } 4540 break; 4541 case ISCSI_LOGOUT_REASON_RECOVERY: 4542 switch (cmd->logout_response) { 4543 case ISCSI_LOGOUT_SUCCESS: 4544 case ISCSI_LOGOUT_CID_NOT_FOUND: 4545 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4546 case ISCSI_LOGOUT_CLEANUP_FAILED: 4547 default: 4548 break; 4549 } 4550 ret = 1; 4551 break; 4552 default: 4553 break; 4554 4555 } 4556 return ret; 4557 } 4558 EXPORT_SYMBOL(iscsit_logout_post_handler); 4559 4560 void iscsit_fail_session(struct iscsi_session *sess) 4561 { 4562 struct iscsi_conn *conn; 4563 4564 spin_lock_bh(&sess->conn_lock); 4565 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4566 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4567 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4568 } 4569 spin_unlock_bh(&sess->conn_lock); 4570 4571 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4572 sess->session_state = TARG_SESS_STATE_FAILED; 4573 } 4574 4575 int iscsit_free_session(struct iscsi_session *sess) 4576 { 4577 u16 conn_count = atomic_read(&sess->nconn); 4578 struct iscsi_conn *conn, *conn_tmp = NULL; 4579 int is_last; 4580 4581 spin_lock_bh(&sess->conn_lock); 4582 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4583 4584 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4585 conn_list) { 4586 if (conn_count == 0) 4587 break; 4588 4589 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4590 is_last = 1; 4591 } else { 4592 iscsit_inc_conn_usage_count(conn_tmp); 4593 is_last = 0; 4594 } 4595 iscsit_inc_conn_usage_count(conn); 4596 4597 spin_unlock_bh(&sess->conn_lock); 4598 iscsit_cause_connection_reinstatement(conn, 1); 4599 spin_lock_bh(&sess->conn_lock); 4600 4601 iscsit_dec_conn_usage_count(conn); 4602 if (is_last == 0) 4603 iscsit_dec_conn_usage_count(conn_tmp); 4604 4605 conn_count--; 4606 } 4607 4608 if (atomic_read(&sess->nconn)) { 4609 spin_unlock_bh(&sess->conn_lock); 4610 wait_for_completion(&sess->session_wait_comp); 4611 } else 4612 spin_unlock_bh(&sess->conn_lock); 4613 4614 iscsit_close_session(sess); 4615 return 0; 4616 } 4617 4618 void iscsit_stop_session( 4619 struct iscsi_session *sess, 4620 int session_sleep, 4621 int connection_sleep) 4622 { 4623 u16 conn_count = atomic_read(&sess->nconn); 4624 struct iscsi_conn *conn, *conn_tmp = NULL; 4625 int is_last; 4626 4627 spin_lock_bh(&sess->conn_lock); 4628 if (session_sleep) 4629 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4630 4631 if (connection_sleep) { 4632 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4633 conn_list) { 4634 if (conn_count == 0) 4635 break; 4636 4637 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4638 is_last = 1; 4639 } else { 4640 iscsit_inc_conn_usage_count(conn_tmp); 4641 is_last = 0; 4642 } 4643 iscsit_inc_conn_usage_count(conn); 4644 4645 spin_unlock_bh(&sess->conn_lock); 4646 iscsit_cause_connection_reinstatement(conn, 1); 4647 spin_lock_bh(&sess->conn_lock); 4648 4649 iscsit_dec_conn_usage_count(conn); 4650 if (is_last == 0) 4651 iscsit_dec_conn_usage_count(conn_tmp); 4652 conn_count--; 4653 } 4654 } else { 4655 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4656 iscsit_cause_connection_reinstatement(conn, 0); 4657 } 4658 4659 if (session_sleep && atomic_read(&sess->nconn)) { 4660 spin_unlock_bh(&sess->conn_lock); 4661 wait_for_completion(&sess->session_wait_comp); 4662 } else 4663 spin_unlock_bh(&sess->conn_lock); 4664 } 4665 4666 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4667 { 4668 struct iscsi_session *sess; 4669 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4670 struct se_session *se_sess, *se_sess_tmp; 4671 LIST_HEAD(free_list); 4672 int session_count = 0; 4673 4674 spin_lock_bh(&se_tpg->session_lock); 4675 if (tpg->nsessions && !force) { 4676 spin_unlock_bh(&se_tpg->session_lock); 4677 return -1; 4678 } 4679 4680 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4681 sess_list) { 4682 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4683 4684 spin_lock(&sess->conn_lock); 4685 if (atomic_read(&sess->session_fall_back_to_erl0) || 4686 atomic_read(&sess->session_logout) || 4687 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4688 spin_unlock(&sess->conn_lock); 4689 continue; 4690 } 4691 atomic_set(&sess->session_reinstatement, 1); 4692 atomic_set(&sess->session_fall_back_to_erl0, 1); 4693 spin_unlock(&sess->conn_lock); 4694 4695 list_move_tail(&se_sess->sess_list, &free_list); 4696 } 4697 spin_unlock_bh(&se_tpg->session_lock); 4698 4699 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4700 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4701 4702 iscsit_free_session(sess); 4703 session_count++; 4704 } 4705 4706 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4707 " Group: %hu\n", session_count, tpg->tpgt); 4708 return 0; 4709 } 4710 4711 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4712 MODULE_VERSION("4.1.x"); 4713 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4714 MODULE_LICENSE("GPL"); 4715 4716 module_init(iscsi_target_init_module); 4717 module_exit(iscsi_target_cleanup_module); 4718