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 ret = iscsi_target_setup_login_socket(np, sockaddr); 376 if (ret != 0) { 377 kfree(np); 378 mutex_unlock(&np_lock); 379 return ERR_PTR(ret); 380 } 381 382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 383 if (IS_ERR(np->np_thread)) { 384 pr_err("Unable to create kthread: iscsi_np\n"); 385 ret = PTR_ERR(np->np_thread); 386 kfree(np); 387 mutex_unlock(&np_lock); 388 return ERR_PTR(ret); 389 } 390 /* 391 * Increment the np_exports reference count now to prevent 392 * iscsit_del_np() below from being run while a new call to 393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 394 * active. We don't need to hold np->np_thread_lock at this 395 * point because iscsi_np has not been added to g_np_list yet. 396 */ 397 np->np_exports = 1; 398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 399 400 list_add_tail(&np->np_list, &g_np_list); 401 mutex_unlock(&np_lock); 402 403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 404 &np->np_sockaddr, np->np_transport->name); 405 406 return np; 407 } 408 409 int iscsit_reset_np_thread( 410 struct iscsi_np *np, 411 struct iscsi_tpg_np *tpg_np, 412 struct iscsi_portal_group *tpg, 413 bool shutdown) 414 { 415 spin_lock_bh(&np->np_thread_lock); 416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 417 spin_unlock_bh(&np->np_thread_lock); 418 return 0; 419 } 420 np->np_thread_state = ISCSI_NP_THREAD_RESET; 421 422 if (np->np_thread) { 423 spin_unlock_bh(&np->np_thread_lock); 424 send_sig(SIGINT, np->np_thread, 1); 425 wait_for_completion(&np->np_restart_comp); 426 spin_lock_bh(&np->np_thread_lock); 427 } 428 spin_unlock_bh(&np->np_thread_lock); 429 430 if (tpg_np && shutdown) { 431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 432 433 wait_for_completion(&tpg_np->tpg_np_comp); 434 } 435 436 return 0; 437 } 438 439 static void iscsit_free_np(struct iscsi_np *np) 440 { 441 if (np->np_socket) 442 sock_release(np->np_socket); 443 } 444 445 int iscsit_del_np(struct iscsi_np *np) 446 { 447 spin_lock_bh(&np->np_thread_lock); 448 np->np_exports--; 449 if (np->np_exports) { 450 np->enabled = true; 451 spin_unlock_bh(&np->np_thread_lock); 452 return 0; 453 } 454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 455 spin_unlock_bh(&np->np_thread_lock); 456 457 if (np->np_thread) { 458 /* 459 * We need to send the signal to wakeup Linux/Net 460 * which may be sleeping in sock_accept().. 461 */ 462 send_sig(SIGINT, np->np_thread, 1); 463 kthread_stop(np->np_thread); 464 np->np_thread = NULL; 465 } 466 467 np->np_transport->iscsit_free_np(np); 468 469 mutex_lock(&np_lock); 470 list_del(&np->np_list); 471 mutex_unlock(&np_lock); 472 473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 474 &np->np_sockaddr, np->np_transport->name); 475 476 iscsit_put_transport(np->np_transport); 477 kfree(np); 478 return 0; 479 } 480 481 static void iscsit_get_rx_pdu(struct iscsi_conn *); 482 483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 484 { 485 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 486 } 487 EXPORT_SYMBOL(iscsit_queue_rsp); 488 489 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 490 { 491 spin_lock_bh(&conn->cmd_lock); 492 if (!list_empty(&cmd->i_conn_node) && 493 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 494 list_del_init(&cmd->i_conn_node); 495 spin_unlock_bh(&conn->cmd_lock); 496 497 __iscsit_free_cmd(cmd, true); 498 } 499 EXPORT_SYMBOL(iscsit_aborted_task); 500 501 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 502 u32, u32, u8 *, u8 *); 503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 504 505 static int 506 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 507 const void *data_buf, u32 data_buf_len) 508 { 509 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 510 struct kvec *iov; 511 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 512 int ret; 513 514 iov = &cmd->iov_misc[0]; 515 iov[niov].iov_base = cmd->pdu; 516 iov[niov++].iov_len = ISCSI_HDR_LEN; 517 518 if (conn->conn_ops->HeaderDigest) { 519 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 520 521 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 522 ISCSI_HDR_LEN, 0, NULL, 523 (u8 *)header_digest); 524 525 iov[0].iov_len += ISCSI_CRC_LEN; 526 tx_size += ISCSI_CRC_LEN; 527 pr_debug("Attaching CRC32C HeaderDigest" 528 " to opcode 0x%x 0x%08x\n", 529 hdr->opcode, *header_digest); 530 } 531 532 if (data_buf_len) { 533 u32 padding = ((-data_buf_len) & 3); 534 535 iov[niov].iov_base = (void *)data_buf; 536 iov[niov++].iov_len = data_buf_len; 537 tx_size += data_buf_len; 538 539 if (padding != 0) { 540 iov[niov].iov_base = &cmd->pad_bytes; 541 iov[niov++].iov_len = padding; 542 tx_size += padding; 543 pr_debug("Attaching %u additional" 544 " padding bytes.\n", padding); 545 } 546 547 if (conn->conn_ops->DataDigest) { 548 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 549 data_buf, data_buf_len, 550 padding, 551 (u8 *)&cmd->pad_bytes, 552 (u8 *)&cmd->data_crc); 553 554 iov[niov].iov_base = &cmd->data_crc; 555 iov[niov++].iov_len = ISCSI_CRC_LEN; 556 tx_size += ISCSI_CRC_LEN; 557 pr_debug("Attached DataDigest for %u" 558 " bytes opcode 0x%x, CRC 0x%08x\n", 559 data_buf_len, hdr->opcode, cmd->data_crc); 560 } 561 } 562 563 cmd->iov_misc_count = niov; 564 cmd->tx_size = tx_size; 565 566 ret = iscsit_send_tx_data(cmd, conn, 1); 567 if (ret < 0) { 568 iscsit_tx_thread_wait_for_tcp(conn); 569 return ret; 570 } 571 572 return 0; 573 } 574 575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 576 static void iscsit_unmap_iovec(struct iscsi_cmd *); 577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 578 u32, u32, u32, u8 *); 579 static int 580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 581 const struct iscsi_datain *datain) 582 { 583 struct kvec *iov; 584 u32 iov_count = 0, tx_size = 0; 585 int ret, iov_ret; 586 587 iov = &cmd->iov_data[0]; 588 iov[iov_count].iov_base = cmd->pdu; 589 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 590 tx_size += ISCSI_HDR_LEN; 591 592 if (conn->conn_ops->HeaderDigest) { 593 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 594 595 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 596 ISCSI_HDR_LEN, 0, NULL, 597 (u8 *)header_digest); 598 599 iov[0].iov_len += ISCSI_CRC_LEN; 600 tx_size += ISCSI_CRC_LEN; 601 602 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 603 *header_digest); 604 } 605 606 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 607 datain->offset, datain->length); 608 if (iov_ret < 0) 609 return -1; 610 611 iov_count += iov_ret; 612 tx_size += datain->length; 613 614 cmd->padding = ((-datain->length) & 3); 615 if (cmd->padding) { 616 iov[iov_count].iov_base = cmd->pad_bytes; 617 iov[iov_count++].iov_len = cmd->padding; 618 tx_size += cmd->padding; 619 620 pr_debug("Attaching %u padding bytes\n", cmd->padding); 621 } 622 623 if (conn->conn_ops->DataDigest) { 624 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 625 cmd, datain->offset, 626 datain->length, 627 cmd->padding, 628 cmd->pad_bytes); 629 630 iov[iov_count].iov_base = &cmd->data_crc; 631 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 632 tx_size += ISCSI_CRC_LEN; 633 634 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 635 datain->length + cmd->padding, cmd->data_crc); 636 } 637 638 cmd->iov_data_count = iov_count; 639 cmd->tx_size = tx_size; 640 641 ret = iscsit_fe_sendpage_sg(cmd, conn); 642 643 iscsit_unmap_iovec(cmd); 644 645 if (ret < 0) { 646 iscsit_tx_thread_wait_for_tcp(conn); 647 return ret; 648 } 649 650 return 0; 651 } 652 653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 654 struct iscsi_datain_req *dr, const void *buf, 655 u32 buf_len) 656 { 657 if (dr) 658 return iscsit_xmit_datain_pdu(conn, cmd, buf); 659 else 660 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 661 } 662 663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 664 { 665 return TARGET_PROT_NORMAL; 666 } 667 668 static struct iscsit_transport iscsi_target_transport = { 669 .name = "iSCSI/TCP", 670 .transport_type = ISCSI_TCP, 671 .rdma_shutdown = false, 672 .owner = NULL, 673 .iscsit_setup_np = iscsit_setup_np, 674 .iscsit_accept_np = iscsit_accept_np, 675 .iscsit_free_np = iscsit_free_np, 676 .iscsit_get_login_rx = iscsit_get_login_rx, 677 .iscsit_put_login_tx = iscsit_put_login_tx, 678 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 679 .iscsit_immediate_queue = iscsit_immediate_queue, 680 .iscsit_response_queue = iscsit_response_queue, 681 .iscsit_queue_data_in = iscsit_queue_rsp, 682 .iscsit_queue_status = iscsit_queue_rsp, 683 .iscsit_aborted_task = iscsit_aborted_task, 684 .iscsit_xmit_pdu = iscsit_xmit_pdu, 685 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 686 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 687 }; 688 689 static int __init iscsi_target_init_module(void) 690 { 691 int ret = 0, size; 692 693 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 694 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 695 if (!iscsit_global) 696 return -1; 697 698 spin_lock_init(&iscsit_global->ts_bitmap_lock); 699 mutex_init(&auth_id_lock); 700 spin_lock_init(&sess_idr_lock); 701 idr_init(&tiqn_idr); 702 idr_init(&sess_idr); 703 704 ret = target_register_template(&iscsi_ops); 705 if (ret) 706 goto out; 707 708 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 709 iscsit_global->ts_bitmap = vzalloc(size); 710 if (!iscsit_global->ts_bitmap) 711 goto configfs_out; 712 713 lio_qr_cache = kmem_cache_create("lio_qr_cache", 714 sizeof(struct iscsi_queue_req), 715 __alignof__(struct iscsi_queue_req), 0, NULL); 716 if (!lio_qr_cache) { 717 pr_err("nable to kmem_cache_create() for" 718 " lio_qr_cache\n"); 719 goto bitmap_out; 720 } 721 722 lio_dr_cache = kmem_cache_create("lio_dr_cache", 723 sizeof(struct iscsi_datain_req), 724 __alignof__(struct iscsi_datain_req), 0, NULL); 725 if (!lio_dr_cache) { 726 pr_err("Unable to kmem_cache_create() for" 727 " lio_dr_cache\n"); 728 goto qr_out; 729 } 730 731 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 732 sizeof(struct iscsi_ooo_cmdsn), 733 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 734 if (!lio_ooo_cache) { 735 pr_err("Unable to kmem_cache_create() for" 736 " lio_ooo_cache\n"); 737 goto dr_out; 738 } 739 740 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 741 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 742 0, NULL); 743 if (!lio_r2t_cache) { 744 pr_err("Unable to kmem_cache_create() for" 745 " lio_r2t_cache\n"); 746 goto ooo_out; 747 } 748 749 iscsit_register_transport(&iscsi_target_transport); 750 751 if (iscsit_load_discovery_tpg() < 0) 752 goto r2t_out; 753 754 return ret; 755 r2t_out: 756 iscsit_unregister_transport(&iscsi_target_transport); 757 kmem_cache_destroy(lio_r2t_cache); 758 ooo_out: 759 kmem_cache_destroy(lio_ooo_cache); 760 dr_out: 761 kmem_cache_destroy(lio_dr_cache); 762 qr_out: 763 kmem_cache_destroy(lio_qr_cache); 764 bitmap_out: 765 vfree(iscsit_global->ts_bitmap); 766 configfs_out: 767 /* XXX: this probably wants it to be it's own unwind step.. */ 768 if (iscsit_global->discovery_tpg) 769 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 770 target_unregister_template(&iscsi_ops); 771 out: 772 kfree(iscsit_global); 773 return -ENOMEM; 774 } 775 776 static void __exit iscsi_target_cleanup_module(void) 777 { 778 iscsit_release_discovery_tpg(); 779 iscsit_unregister_transport(&iscsi_target_transport); 780 kmem_cache_destroy(lio_qr_cache); 781 kmem_cache_destroy(lio_dr_cache); 782 kmem_cache_destroy(lio_ooo_cache); 783 kmem_cache_destroy(lio_r2t_cache); 784 785 /* 786 * Shutdown discovery sessions and disable discovery TPG 787 */ 788 if (iscsit_global->discovery_tpg) 789 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 790 791 target_unregister_template(&iscsi_ops); 792 793 vfree(iscsit_global->ts_bitmap); 794 kfree(iscsit_global); 795 } 796 797 int iscsit_add_reject( 798 struct iscsi_conn *conn, 799 u8 reason, 800 unsigned char *buf) 801 { 802 struct iscsi_cmd *cmd; 803 804 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 805 if (!cmd) 806 return -1; 807 808 cmd->iscsi_opcode = ISCSI_OP_REJECT; 809 cmd->reject_reason = reason; 810 811 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 812 if (!cmd->buf_ptr) { 813 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 814 iscsit_free_cmd(cmd, false); 815 return -1; 816 } 817 818 spin_lock_bh(&conn->cmd_lock); 819 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 820 spin_unlock_bh(&conn->cmd_lock); 821 822 cmd->i_state = ISTATE_SEND_REJECT; 823 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 824 825 return -1; 826 } 827 EXPORT_SYMBOL(iscsit_add_reject); 828 829 static int iscsit_add_reject_from_cmd( 830 struct iscsi_cmd *cmd, 831 u8 reason, 832 bool add_to_conn, 833 unsigned char *buf) 834 { 835 struct iscsi_conn *conn; 836 837 if (!cmd->conn) { 838 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 839 cmd->init_task_tag); 840 return -1; 841 } 842 conn = cmd->conn; 843 844 cmd->iscsi_opcode = ISCSI_OP_REJECT; 845 cmd->reject_reason = reason; 846 847 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 848 if (!cmd->buf_ptr) { 849 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 850 iscsit_free_cmd(cmd, false); 851 return -1; 852 } 853 854 if (add_to_conn) { 855 spin_lock_bh(&conn->cmd_lock); 856 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 857 spin_unlock_bh(&conn->cmd_lock); 858 } 859 860 cmd->i_state = ISTATE_SEND_REJECT; 861 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 862 /* 863 * Perform the kref_put now if se_cmd has already been setup by 864 * scsit_setup_scsi_cmd() 865 */ 866 if (cmd->se_cmd.se_tfo != NULL) { 867 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 868 target_put_sess_cmd(&cmd->se_cmd); 869 } 870 return -1; 871 } 872 873 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 874 unsigned char *buf) 875 { 876 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 877 } 878 879 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 880 { 881 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 882 } 883 EXPORT_SYMBOL(iscsit_reject_cmd); 884 885 /* 886 * Map some portion of the allocated scatterlist to an iovec, suitable for 887 * kernel sockets to copy data in/out. 888 */ 889 static int iscsit_map_iovec( 890 struct iscsi_cmd *cmd, 891 struct kvec *iov, 892 u32 data_offset, 893 u32 data_length) 894 { 895 u32 i = 0; 896 struct scatterlist *sg; 897 unsigned int page_off; 898 899 /* 900 * We know each entry in t_data_sg contains a page. 901 */ 902 u32 ent = data_offset / PAGE_SIZE; 903 904 if (ent >= cmd->se_cmd.t_data_nents) { 905 pr_err("Initial page entry out-of-bounds\n"); 906 return -1; 907 } 908 909 sg = &cmd->se_cmd.t_data_sg[ent]; 910 page_off = (data_offset % PAGE_SIZE); 911 912 cmd->first_data_sg = sg; 913 cmd->first_data_sg_off = page_off; 914 915 while (data_length) { 916 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 917 918 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 919 iov[i].iov_len = cur_len; 920 921 data_length -= cur_len; 922 page_off = 0; 923 sg = sg_next(sg); 924 i++; 925 } 926 927 cmd->kmapped_nents = i; 928 929 return i; 930 } 931 932 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 933 { 934 u32 i; 935 struct scatterlist *sg; 936 937 sg = cmd->first_data_sg; 938 939 for (i = 0; i < cmd->kmapped_nents; i++) 940 kunmap(sg_page(&sg[i])); 941 } 942 943 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 944 { 945 LIST_HEAD(ack_list); 946 struct iscsi_cmd *cmd, *cmd_p; 947 948 conn->exp_statsn = exp_statsn; 949 950 if (conn->sess->sess_ops->RDMAExtensions) 951 return; 952 953 spin_lock_bh(&conn->cmd_lock); 954 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 955 spin_lock(&cmd->istate_lock); 956 if ((cmd->i_state == ISTATE_SENT_STATUS) && 957 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 958 cmd->i_state = ISTATE_REMOVE; 959 spin_unlock(&cmd->istate_lock); 960 list_move_tail(&cmd->i_conn_node, &ack_list); 961 continue; 962 } 963 spin_unlock(&cmd->istate_lock); 964 } 965 spin_unlock_bh(&conn->cmd_lock); 966 967 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 968 list_del_init(&cmd->i_conn_node); 969 iscsit_free_cmd(cmd, false); 970 } 971 } 972 973 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 974 { 975 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 976 977 iov_count += ISCSI_IOV_DATA_BUFFER; 978 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 979 if (!cmd->iov_data) 980 return -ENOMEM; 981 982 cmd->orig_iov_data_count = iov_count; 983 return 0; 984 } 985 986 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 987 unsigned char *buf) 988 { 989 int data_direction, payload_length; 990 struct iscsi_scsi_req *hdr; 991 int iscsi_task_attr; 992 int sam_task_attr; 993 994 atomic_long_inc(&conn->sess->cmd_pdus); 995 996 hdr = (struct iscsi_scsi_req *) buf; 997 payload_length = ntoh24(hdr->dlength); 998 999 /* FIXME; Add checks for AdditionalHeaderSegment */ 1000 1001 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1002 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1003 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1004 " not set. Bad iSCSI Initiator.\n"); 1005 return iscsit_add_reject_cmd(cmd, 1006 ISCSI_REASON_BOOKMARK_INVALID, buf); 1007 } 1008 1009 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1010 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1011 /* 1012 * From RFC-3720 Section 10.3.1: 1013 * 1014 * "Either or both of R and W MAY be 1 when either the 1015 * Expected Data Transfer Length and/or Bidirectional Read 1016 * Expected Data Transfer Length are 0" 1017 * 1018 * For this case, go ahead and clear the unnecssary bits 1019 * to avoid any confusion with ->data_direction. 1020 */ 1021 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1022 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1023 1024 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1025 " set when Expected Data Transfer Length is 0 for" 1026 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1027 } 1028 1029 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1030 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1031 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1032 " MUST be set if Expected Data Transfer Length is not 0." 1033 " Bad iSCSI Initiator\n"); 1034 return iscsit_add_reject_cmd(cmd, 1035 ISCSI_REASON_BOOKMARK_INVALID, buf); 1036 } 1037 1038 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1039 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1040 pr_err("Bidirectional operations not supported!\n"); 1041 return iscsit_add_reject_cmd(cmd, 1042 ISCSI_REASON_BOOKMARK_INVALID, buf); 1043 } 1044 1045 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1046 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1047 " Scsi Command PDU.\n"); 1048 return iscsit_add_reject_cmd(cmd, 1049 ISCSI_REASON_BOOKMARK_INVALID, buf); 1050 } 1051 1052 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1053 pr_err("ImmediateData=No but DataSegmentLength=%u," 1054 " protocol error.\n", payload_length); 1055 return iscsit_add_reject_cmd(cmd, 1056 ISCSI_REASON_PROTOCOL_ERROR, buf); 1057 } 1058 1059 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1060 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1061 pr_err("Expected Data Transfer Length and Length of" 1062 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1063 " bit is not set protocol error\n"); 1064 return iscsit_add_reject_cmd(cmd, 1065 ISCSI_REASON_PROTOCOL_ERROR, buf); 1066 } 1067 1068 if (payload_length > be32_to_cpu(hdr->data_length)) { 1069 pr_err("DataSegmentLength: %u is greater than" 1070 " EDTL: %u, protocol error.\n", payload_length, 1071 hdr->data_length); 1072 return iscsit_add_reject_cmd(cmd, 1073 ISCSI_REASON_PROTOCOL_ERROR, buf); 1074 } 1075 1076 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1077 pr_err("DataSegmentLength: %u is greater than" 1078 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1079 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1080 return iscsit_add_reject_cmd(cmd, 1081 ISCSI_REASON_PROTOCOL_ERROR, buf); 1082 } 1083 1084 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1085 pr_err("DataSegmentLength: %u is greater than" 1086 " FirstBurstLength: %u, protocol error.\n", 1087 payload_length, conn->sess->sess_ops->FirstBurstLength); 1088 return iscsit_add_reject_cmd(cmd, 1089 ISCSI_REASON_BOOKMARK_INVALID, buf); 1090 } 1091 1092 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1093 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1094 DMA_NONE; 1095 1096 cmd->data_direction = data_direction; 1097 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1098 /* 1099 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1100 */ 1101 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1102 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1103 sam_task_attr = TCM_SIMPLE_TAG; 1104 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1105 sam_task_attr = TCM_ORDERED_TAG; 1106 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1107 sam_task_attr = TCM_HEAD_TAG; 1108 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1109 sam_task_attr = TCM_ACA_TAG; 1110 else { 1111 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1112 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1113 sam_task_attr = TCM_SIMPLE_TAG; 1114 } 1115 1116 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1117 cmd->i_state = ISTATE_NEW_CMD; 1118 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1119 cmd->immediate_data = (payload_length) ? 1 : 0; 1120 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1121 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1122 if (cmd->unsolicited_data) 1123 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1124 1125 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1126 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1127 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1128 else 1129 cmd->targ_xfer_tag = 0xFFFFFFFF; 1130 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1131 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1132 cmd->first_burst_len = payload_length; 1133 1134 if (!conn->sess->sess_ops->RDMAExtensions && 1135 cmd->data_direction == DMA_FROM_DEVICE) { 1136 struct iscsi_datain_req *dr; 1137 1138 dr = iscsit_allocate_datain_req(); 1139 if (!dr) 1140 return iscsit_add_reject_cmd(cmd, 1141 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1142 1143 iscsit_attach_datain_req(cmd, dr); 1144 } 1145 1146 /* 1147 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1148 */ 1149 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1150 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1151 cmd->data_direction, sam_task_attr, 1152 cmd->sense_buffer + 2); 1153 1154 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1155 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1156 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1157 conn->cid); 1158 1159 target_get_sess_cmd(&cmd->se_cmd, true); 1160 1161 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1162 scsilun_to_int(&hdr->lun)); 1163 if (cmd->sense_reason) 1164 goto attach_cmd; 1165 1166 /* only used for printks or comparing with ->ref_task_tag */ 1167 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1168 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1169 if (cmd->sense_reason) { 1170 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1171 return iscsit_add_reject_cmd(cmd, 1172 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1173 } 1174 1175 goto attach_cmd; 1176 } 1177 1178 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1179 return iscsit_add_reject_cmd(cmd, 1180 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1181 } 1182 1183 attach_cmd: 1184 spin_lock_bh(&conn->cmd_lock); 1185 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1186 spin_unlock_bh(&conn->cmd_lock); 1187 /* 1188 * Check if we need to delay processing because of ALUA 1189 * Active/NonOptimized primary access state.. 1190 */ 1191 core_alua_check_nonop_delay(&cmd->se_cmd); 1192 1193 return 0; 1194 } 1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1196 1197 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1198 { 1199 iscsit_set_dataout_sequence_values(cmd); 1200 1201 spin_lock_bh(&cmd->dataout_timeout_lock); 1202 iscsit_start_dataout_timer(cmd, cmd->conn); 1203 spin_unlock_bh(&cmd->dataout_timeout_lock); 1204 } 1205 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1206 1207 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1208 struct iscsi_scsi_req *hdr) 1209 { 1210 int cmdsn_ret = 0; 1211 /* 1212 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1213 * the Immediate Bit is not set, and no Immediate 1214 * Data is attached. 1215 * 1216 * A PDU/CmdSN carrying Immediate Data can only 1217 * be processed after the DataCRC has passed. 1218 * If the DataCRC fails, the CmdSN MUST NOT 1219 * be acknowledged. (See below) 1220 */ 1221 if (!cmd->immediate_data) { 1222 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1223 (unsigned char *)hdr, hdr->cmdsn); 1224 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1225 return -1; 1226 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1227 target_put_sess_cmd(&cmd->se_cmd); 1228 return 0; 1229 } 1230 } 1231 1232 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1233 1234 /* 1235 * If no Immediate Data is attached, it's OK to return now. 1236 */ 1237 if (!cmd->immediate_data) { 1238 if (!cmd->sense_reason && cmd->unsolicited_data) 1239 iscsit_set_unsoliticed_dataout(cmd); 1240 if (!cmd->sense_reason) 1241 return 0; 1242 1243 target_put_sess_cmd(&cmd->se_cmd); 1244 return 0; 1245 } 1246 1247 /* 1248 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1249 * execution. These exceptions are processed in CmdSN order using 1250 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1251 */ 1252 if (cmd->sense_reason) 1253 return 1; 1254 /* 1255 * Call directly into transport_generic_new_cmd() to perform 1256 * the backend memory allocation. 1257 */ 1258 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1259 if (cmd->sense_reason) 1260 return 1; 1261 1262 return 0; 1263 } 1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1265 1266 static int 1267 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1268 bool dump_payload) 1269 { 1270 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1271 /* 1272 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1273 */ 1274 if (dump_payload) 1275 goto after_immediate_data; 1276 /* 1277 * Check for underflow case where both EDTL and immediate data payload 1278 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has 1279 * already been set in target_cmd_size_check() as se_cmd->data_length. 1280 * 1281 * For this special case, fail the command and dump the immediate data 1282 * payload. 1283 */ 1284 if (cmd->first_burst_len > cmd->se_cmd.data_length) { 1285 cmd->sense_reason = TCM_INVALID_CDB_FIELD; 1286 goto after_immediate_data; 1287 } 1288 1289 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1290 cmd->first_burst_len); 1291 after_immediate_data: 1292 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1293 /* 1294 * A PDU/CmdSN carrying Immediate Data passed 1295 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1296 * Immediate Bit is not set. 1297 */ 1298 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1299 (unsigned char *)hdr, hdr->cmdsn); 1300 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1301 return -1; 1302 1303 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1304 int rc; 1305 1306 rc = iscsit_dump_data_payload(cmd->conn, 1307 cmd->first_burst_len, 1); 1308 target_put_sess_cmd(&cmd->se_cmd); 1309 return rc; 1310 } else if (cmd->unsolicited_data) 1311 iscsit_set_unsoliticed_dataout(cmd); 1312 1313 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1314 /* 1315 * Immediate Data failed DataCRC and ERL>=1, 1316 * silently drop this PDU and let the initiator 1317 * plug the CmdSN gap. 1318 * 1319 * FIXME: Send Unsolicited NOPIN with reserved 1320 * TTT here to help the initiator figure out 1321 * the missing CmdSN, although they should be 1322 * intelligent enough to determine the missing 1323 * CmdSN and issue a retry to plug the sequence. 1324 */ 1325 cmd->i_state = ISTATE_REMOVE; 1326 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1327 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1328 return -1; 1329 1330 return 0; 1331 } 1332 1333 static int 1334 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1335 unsigned char *buf) 1336 { 1337 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1338 int rc, immed_data; 1339 bool dump_payload = false; 1340 1341 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1342 if (rc < 0) 1343 return 0; 1344 /* 1345 * Allocation iovecs needed for struct socket operations for 1346 * traditional iSCSI block I/O. 1347 */ 1348 if (iscsit_allocate_iovecs(cmd) < 0) { 1349 return iscsit_reject_cmd(cmd, 1350 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1351 } 1352 immed_data = cmd->immediate_data; 1353 1354 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1355 if (rc < 0) 1356 return rc; 1357 else if (rc > 0) 1358 dump_payload = true; 1359 1360 if (!immed_data) 1361 return 0; 1362 1363 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1364 } 1365 1366 static u32 iscsit_do_crypto_hash_sg( 1367 struct ahash_request *hash, 1368 struct iscsi_cmd *cmd, 1369 u32 data_offset, 1370 u32 data_length, 1371 u32 padding, 1372 u8 *pad_bytes) 1373 { 1374 u32 data_crc; 1375 struct scatterlist *sg; 1376 unsigned int page_off; 1377 1378 crypto_ahash_init(hash); 1379 1380 sg = cmd->first_data_sg; 1381 page_off = cmd->first_data_sg_off; 1382 1383 while (data_length) { 1384 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1385 1386 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1387 crypto_ahash_update(hash); 1388 1389 data_length -= cur_len; 1390 page_off = 0; 1391 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1392 sg = sg_next(sg); 1393 } 1394 1395 if (padding) { 1396 struct scatterlist pad_sg; 1397 1398 sg_init_one(&pad_sg, pad_bytes, padding); 1399 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1400 padding); 1401 crypto_ahash_finup(hash); 1402 } else { 1403 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1404 crypto_ahash_final(hash); 1405 } 1406 1407 return data_crc; 1408 } 1409 1410 static void iscsit_do_crypto_hash_buf( 1411 struct ahash_request *hash, 1412 const void *buf, 1413 u32 payload_length, 1414 u32 padding, 1415 u8 *pad_bytes, 1416 u8 *data_crc) 1417 { 1418 struct scatterlist sg[2]; 1419 1420 sg_init_table(sg, ARRAY_SIZE(sg)); 1421 sg_set_buf(sg, buf, payload_length); 1422 sg_set_buf(sg + 1, pad_bytes, padding); 1423 1424 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1425 1426 crypto_ahash_digest(hash); 1427 } 1428 1429 int 1430 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1431 struct iscsi_cmd *cmd, u32 payload_length, 1432 bool *success) 1433 { 1434 struct iscsi_data *hdr = buf; 1435 struct se_cmd *se_cmd; 1436 int rc; 1437 1438 /* iSCSI write */ 1439 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1440 1441 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1442 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1443 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1444 payload_length, conn->cid); 1445 1446 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1447 pr_err("Command ITT: 0x%08x received DataOUT after" 1448 " last DataOUT received, dumping payload\n", 1449 cmd->init_task_tag); 1450 return iscsit_dump_data_payload(conn, payload_length, 1); 1451 } 1452 1453 if (cmd->data_direction != DMA_TO_DEVICE) { 1454 pr_err("Command ITT: 0x%08x received DataOUT for a" 1455 " NON-WRITE command.\n", cmd->init_task_tag); 1456 return iscsit_dump_data_payload(conn, payload_length, 1); 1457 } 1458 se_cmd = &cmd->se_cmd; 1459 iscsit_mod_dataout_timer(cmd); 1460 1461 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1462 pr_err("DataOut Offset: %u, Length %u greater than" 1463 " iSCSI Command EDTL %u, protocol error.\n", 1464 hdr->offset, payload_length, cmd->se_cmd.data_length); 1465 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1466 } 1467 1468 if (cmd->unsolicited_data) { 1469 int dump_unsolicited_data = 0; 1470 1471 if (conn->sess->sess_ops->InitialR2T) { 1472 pr_err("Received unexpected unsolicited data" 1473 " while InitialR2T=Yes, protocol error.\n"); 1474 transport_send_check_condition_and_sense(&cmd->se_cmd, 1475 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1476 return -1; 1477 } 1478 /* 1479 * Special case for dealing with Unsolicited DataOUT 1480 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1481 * failures; 1482 */ 1483 1484 /* Something's amiss if we're not in WRITE_PENDING state... */ 1485 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1486 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1487 dump_unsolicited_data = 1; 1488 1489 if (dump_unsolicited_data) { 1490 /* 1491 * Check if a delayed TASK_ABORTED status needs to 1492 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1493 * received with the unsolicited data out. 1494 */ 1495 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1496 iscsit_stop_dataout_timer(cmd); 1497 1498 transport_check_aborted_status(se_cmd, 1499 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1500 return iscsit_dump_data_payload(conn, payload_length, 1); 1501 } 1502 } else { 1503 /* 1504 * For the normal solicited data path: 1505 * 1506 * Check for a delayed TASK_ABORTED status and dump any 1507 * incoming data out payload if one exists. Also, when the 1508 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1509 * data out sequence, we decrement outstanding_r2ts. Once 1510 * outstanding_r2ts reaches zero, go ahead and send the delayed 1511 * TASK_ABORTED status. 1512 */ 1513 if (se_cmd->transport_state & CMD_T_ABORTED) { 1514 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1515 if (--cmd->outstanding_r2ts < 1) { 1516 iscsit_stop_dataout_timer(cmd); 1517 transport_check_aborted_status( 1518 se_cmd, 1); 1519 } 1520 1521 return iscsit_dump_data_payload(conn, payload_length, 1); 1522 } 1523 } 1524 /* 1525 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1526 * within-command recovery checks before receiving the payload. 1527 */ 1528 rc = iscsit_check_pre_dataout(cmd, buf); 1529 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1530 return 0; 1531 else if (rc == DATAOUT_CANNOT_RECOVER) 1532 return -1; 1533 *success = true; 1534 return 0; 1535 } 1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1537 1538 int 1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1540 struct iscsi_cmd **out_cmd) 1541 { 1542 struct iscsi_data *hdr = buf; 1543 struct iscsi_cmd *cmd; 1544 u32 payload_length = ntoh24(hdr->dlength); 1545 int rc; 1546 bool success = false; 1547 1548 if (!payload_length) { 1549 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1550 return 0; 1551 } 1552 1553 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1554 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1555 " MaxXmitDataSegmentLength: %u\n", payload_length, 1556 conn->conn_ops->MaxXmitDataSegmentLength); 1557 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1558 } 1559 1560 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1561 if (!cmd) 1562 return 0; 1563 1564 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1565 1566 if (success) 1567 *out_cmd = cmd; 1568 1569 return rc; 1570 } 1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1572 1573 static int 1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1575 struct iscsi_data *hdr) 1576 { 1577 struct kvec *iov; 1578 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1579 u32 payload_length = ntoh24(hdr->dlength); 1580 int iov_ret, data_crc_failed = 0; 1581 1582 rx_size += payload_length; 1583 iov = &cmd->iov_data[0]; 1584 1585 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1586 payload_length); 1587 if (iov_ret < 0) 1588 return -1; 1589 1590 iov_count += iov_ret; 1591 1592 padding = ((-payload_length) & 3); 1593 if (padding != 0) { 1594 iov[iov_count].iov_base = cmd->pad_bytes; 1595 iov[iov_count++].iov_len = padding; 1596 rx_size += padding; 1597 pr_debug("Receiving %u padding bytes.\n", padding); 1598 } 1599 1600 if (conn->conn_ops->DataDigest) { 1601 iov[iov_count].iov_base = &checksum; 1602 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1603 rx_size += ISCSI_CRC_LEN; 1604 } 1605 1606 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1607 1608 iscsit_unmap_iovec(cmd); 1609 1610 if (rx_got != rx_size) 1611 return -1; 1612 1613 if (conn->conn_ops->DataDigest) { 1614 u32 data_crc; 1615 1616 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1617 be32_to_cpu(hdr->offset), 1618 payload_length, padding, 1619 cmd->pad_bytes); 1620 1621 if (checksum != data_crc) { 1622 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1623 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1624 " does not match computed 0x%08x\n", 1625 hdr->itt, hdr->offset, payload_length, 1626 hdr->datasn, checksum, data_crc); 1627 data_crc_failed = 1; 1628 } else { 1629 pr_debug("Got CRC32C DataDigest 0x%08x for" 1630 " %u bytes of Data Out\n", checksum, 1631 payload_length); 1632 } 1633 } 1634 1635 return data_crc_failed; 1636 } 1637 1638 int 1639 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1640 bool data_crc_failed) 1641 { 1642 struct iscsi_conn *conn = cmd->conn; 1643 int rc, ooo_cmdsn; 1644 /* 1645 * Increment post receive data and CRC values or perform 1646 * within-command recovery. 1647 */ 1648 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1649 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1650 return 0; 1651 else if (rc == DATAOUT_SEND_R2T) { 1652 iscsit_set_dataout_sequence_values(cmd); 1653 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1654 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1655 /* 1656 * Handle extra special case for out of order 1657 * Unsolicited Data Out. 1658 */ 1659 spin_lock_bh(&cmd->istate_lock); 1660 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1661 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1662 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1663 spin_unlock_bh(&cmd->istate_lock); 1664 1665 iscsit_stop_dataout_timer(cmd); 1666 if (ooo_cmdsn) 1667 return 0; 1668 target_execute_cmd(&cmd->se_cmd); 1669 return 0; 1670 } else /* DATAOUT_CANNOT_RECOVER */ 1671 return -1; 1672 1673 return 0; 1674 } 1675 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1676 1677 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1678 { 1679 struct iscsi_cmd *cmd = NULL; 1680 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1681 int rc; 1682 bool data_crc_failed = false; 1683 1684 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1685 if (rc < 0) 1686 return 0; 1687 else if (!cmd) 1688 return 0; 1689 1690 rc = iscsit_get_dataout(conn, cmd, hdr); 1691 if (rc < 0) 1692 return rc; 1693 else if (rc > 0) 1694 data_crc_failed = true; 1695 1696 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1697 } 1698 1699 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1700 struct iscsi_nopout *hdr) 1701 { 1702 u32 payload_length = ntoh24(hdr->dlength); 1703 1704 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1705 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1706 if (!cmd) 1707 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1708 (unsigned char *)hdr); 1709 1710 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1711 (unsigned char *)hdr); 1712 } 1713 1714 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1715 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1716 " not set, protocol error.\n"); 1717 if (!cmd) 1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1719 (unsigned char *)hdr); 1720 1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1722 (unsigned char *)hdr); 1723 } 1724 1725 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1726 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1727 " greater than MaxXmitDataSegmentLength: %u, protocol" 1728 " error.\n", payload_length, 1729 conn->conn_ops->MaxXmitDataSegmentLength); 1730 if (!cmd) 1731 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1732 (unsigned char *)hdr); 1733 1734 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1735 (unsigned char *)hdr); 1736 } 1737 1738 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1739 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1740 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1741 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1742 payload_length); 1743 /* 1744 * This is not a response to a Unsolicited NopIN, which means 1745 * it can either be a NOPOUT ping request (with a valid ITT), 1746 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1747 * Either way, make sure we allocate an struct iscsi_cmd, as both 1748 * can contain ping data. 1749 */ 1750 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1751 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1752 cmd->i_state = ISTATE_SEND_NOPIN; 1753 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1754 1 : 0); 1755 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1756 cmd->targ_xfer_tag = 0xFFFFFFFF; 1757 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1758 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1759 cmd->data_direction = DMA_NONE; 1760 } 1761 1762 return 0; 1763 } 1764 EXPORT_SYMBOL(iscsit_setup_nop_out); 1765 1766 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1767 struct iscsi_nopout *hdr) 1768 { 1769 struct iscsi_cmd *cmd_p = NULL; 1770 int cmdsn_ret = 0; 1771 /* 1772 * Initiator is expecting a NopIN ping reply.. 1773 */ 1774 if (hdr->itt != RESERVED_ITT) { 1775 if (!cmd) 1776 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1777 (unsigned char *)hdr); 1778 1779 spin_lock_bh(&conn->cmd_lock); 1780 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1781 spin_unlock_bh(&conn->cmd_lock); 1782 1783 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1784 1785 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1786 iscsit_add_cmd_to_response_queue(cmd, conn, 1787 cmd->i_state); 1788 return 0; 1789 } 1790 1791 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1792 (unsigned char *)hdr, hdr->cmdsn); 1793 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1794 return 0; 1795 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1796 return -1; 1797 1798 return 0; 1799 } 1800 /* 1801 * This was a response to a unsolicited NOPIN ping. 1802 */ 1803 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1804 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1805 if (!cmd_p) 1806 return -EINVAL; 1807 1808 iscsit_stop_nopin_response_timer(conn); 1809 1810 cmd_p->i_state = ISTATE_REMOVE; 1811 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1812 1813 iscsit_start_nopin_timer(conn); 1814 return 0; 1815 } 1816 /* 1817 * Otherwise, initiator is not expecting a NOPIN is response. 1818 * Just ignore for now. 1819 */ 1820 1821 if (cmd) 1822 iscsit_free_cmd(cmd, false); 1823 1824 return 0; 1825 } 1826 EXPORT_SYMBOL(iscsit_process_nop_out); 1827 1828 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1829 unsigned char *buf) 1830 { 1831 unsigned char *ping_data = NULL; 1832 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1833 struct kvec *iov = NULL; 1834 u32 payload_length = ntoh24(hdr->dlength); 1835 int ret; 1836 1837 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1838 if (ret < 0) 1839 return 0; 1840 /* 1841 * Handle NOP-OUT payload for traditional iSCSI sockets 1842 */ 1843 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1844 u32 checksum, data_crc, padding = 0; 1845 int niov = 0, rx_got, rx_size = payload_length; 1846 1847 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1848 if (!ping_data) { 1849 ret = -1; 1850 goto out; 1851 } 1852 1853 iov = &cmd->iov_misc[0]; 1854 iov[niov].iov_base = ping_data; 1855 iov[niov++].iov_len = payload_length; 1856 1857 padding = ((-payload_length) & 3); 1858 if (padding != 0) { 1859 pr_debug("Receiving %u additional bytes" 1860 " for padding.\n", padding); 1861 iov[niov].iov_base = &cmd->pad_bytes; 1862 iov[niov++].iov_len = padding; 1863 rx_size += padding; 1864 } 1865 if (conn->conn_ops->DataDigest) { 1866 iov[niov].iov_base = &checksum; 1867 iov[niov++].iov_len = ISCSI_CRC_LEN; 1868 rx_size += ISCSI_CRC_LEN; 1869 } 1870 1871 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1872 if (rx_got != rx_size) { 1873 ret = -1; 1874 goto out; 1875 } 1876 1877 if (conn->conn_ops->DataDigest) { 1878 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 1879 ping_data, payload_length, 1880 padding, cmd->pad_bytes, 1881 (u8 *)&data_crc); 1882 1883 if (checksum != data_crc) { 1884 pr_err("Ping data CRC32C DataDigest" 1885 " 0x%08x does not match computed 0x%08x\n", 1886 checksum, data_crc); 1887 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1888 pr_err("Unable to recover from" 1889 " NOPOUT Ping DataCRC failure while in" 1890 " ERL=0.\n"); 1891 ret = -1; 1892 goto out; 1893 } else { 1894 /* 1895 * Silently drop this PDU and let the 1896 * initiator plug the CmdSN gap. 1897 */ 1898 pr_debug("Dropping NOPOUT" 1899 " Command CmdSN: 0x%08x due to" 1900 " DataCRC error.\n", hdr->cmdsn); 1901 ret = 0; 1902 goto out; 1903 } 1904 } else { 1905 pr_debug("Got CRC32C DataDigest" 1906 " 0x%08x for %u bytes of ping data.\n", 1907 checksum, payload_length); 1908 } 1909 } 1910 1911 ping_data[payload_length] = '\0'; 1912 /* 1913 * Attach ping data to struct iscsi_cmd->buf_ptr. 1914 */ 1915 cmd->buf_ptr = ping_data; 1916 cmd->buf_ptr_size = payload_length; 1917 1918 pr_debug("Got %u bytes of NOPOUT ping" 1919 " data.\n", payload_length); 1920 pr_debug("Ping Data: \"%s\"\n", ping_data); 1921 } 1922 1923 return iscsit_process_nop_out(conn, cmd, hdr); 1924 out: 1925 if (cmd) 1926 iscsit_free_cmd(cmd, false); 1927 1928 kfree(ping_data); 1929 return ret; 1930 } 1931 1932 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1933 { 1934 switch (iscsi_tmf) { 1935 case ISCSI_TM_FUNC_ABORT_TASK: 1936 return TMR_ABORT_TASK; 1937 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1938 return TMR_ABORT_TASK_SET; 1939 case ISCSI_TM_FUNC_CLEAR_ACA: 1940 return TMR_CLEAR_ACA; 1941 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1942 return TMR_CLEAR_TASK_SET; 1943 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1944 return TMR_LUN_RESET; 1945 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1946 return TMR_TARGET_WARM_RESET; 1947 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1948 return TMR_TARGET_COLD_RESET; 1949 default: 1950 return TMR_UNKNOWN; 1951 } 1952 } 1953 1954 int 1955 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1956 unsigned char *buf) 1957 { 1958 struct se_tmr_req *se_tmr; 1959 struct iscsi_tmr_req *tmr_req; 1960 struct iscsi_tm *hdr; 1961 int out_of_order_cmdsn = 0, ret; 1962 bool sess_ref = false; 1963 u8 function, tcm_function = TMR_UNKNOWN; 1964 1965 hdr = (struct iscsi_tm *) buf; 1966 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1967 function = hdr->flags; 1968 1969 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1970 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1971 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1972 hdr->rtt, hdr->refcmdsn, conn->cid); 1973 1974 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1975 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1976 hdr->rtt != RESERVED_ITT)) { 1977 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1978 hdr->rtt = RESERVED_ITT; 1979 } 1980 1981 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1982 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1983 pr_err("Task Management Request TASK_REASSIGN not" 1984 " issued as immediate command, bad iSCSI Initiator" 1985 "implementation\n"); 1986 return iscsit_add_reject_cmd(cmd, 1987 ISCSI_REASON_PROTOCOL_ERROR, buf); 1988 } 1989 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1990 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1991 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1992 1993 cmd->data_direction = DMA_NONE; 1994 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1995 if (!cmd->tmr_req) 1996 return iscsit_add_reject_cmd(cmd, 1997 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1998 buf); 1999 2000 /* 2001 * TASK_REASSIGN for ERL=2 / connection stays inside of 2002 * LIO-Target $FABRIC_MOD 2003 */ 2004 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2005 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 2006 conn->sess->se_sess, 0, DMA_NONE, 2007 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2008 2009 target_get_sess_cmd(&cmd->se_cmd, true); 2010 sess_ref = true; 2011 tcm_function = iscsit_convert_tmf(function); 2012 if (tcm_function == TMR_UNKNOWN) { 2013 pr_err("Unknown iSCSI TMR Function:" 2014 " 0x%02x\n", function); 2015 return iscsit_add_reject_cmd(cmd, 2016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2017 } 2018 } 2019 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2020 GFP_KERNEL); 2021 if (ret < 0) 2022 return iscsit_add_reject_cmd(cmd, 2023 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2024 2025 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2026 2027 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2028 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2029 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2030 cmd->init_task_tag = hdr->itt; 2031 cmd->targ_xfer_tag = 0xFFFFFFFF; 2032 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2033 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2034 se_tmr = cmd->se_cmd.se_tmr_req; 2035 tmr_req = cmd->tmr_req; 2036 /* 2037 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2038 */ 2039 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2040 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2041 scsilun_to_int(&hdr->lun)); 2042 if (ret < 0) { 2043 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2044 goto attach; 2045 } 2046 } 2047 2048 switch (function) { 2049 case ISCSI_TM_FUNC_ABORT_TASK: 2050 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2051 if (se_tmr->response) 2052 goto attach; 2053 break; 2054 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2055 case ISCSI_TM_FUNC_CLEAR_ACA: 2056 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2057 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2058 break; 2059 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2060 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2061 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2062 goto attach; 2063 } 2064 break; 2065 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2066 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2067 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2068 goto attach; 2069 } 2070 break; 2071 case ISCSI_TM_FUNC_TASK_REASSIGN: 2072 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2073 /* 2074 * Perform sanity checks on the ExpDataSN only if the 2075 * TASK_REASSIGN was successful. 2076 */ 2077 if (se_tmr->response) 2078 break; 2079 2080 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2081 return iscsit_add_reject_cmd(cmd, 2082 ISCSI_REASON_BOOKMARK_INVALID, buf); 2083 break; 2084 default: 2085 pr_err("Unknown TMR function: 0x%02x, protocol" 2086 " error.\n", function); 2087 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2088 goto attach; 2089 } 2090 2091 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2092 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2093 se_tmr->call_transport = 1; 2094 attach: 2095 spin_lock_bh(&conn->cmd_lock); 2096 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2097 spin_unlock_bh(&conn->cmd_lock); 2098 2099 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2100 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2101 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 2102 out_of_order_cmdsn = 1; 2103 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2104 return 0; 2105 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2106 return -1; 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 if (sess_ref) { 2127 pr_debug("Handle TMR, using sess_ref=true check\n"); 2128 target_put_sess_cmd(&cmd->se_cmd); 2129 } 2130 2131 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2132 return 0; 2133 } 2134 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2135 2136 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2137 int 2138 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2139 struct iscsi_text *hdr) 2140 { 2141 u32 payload_length = ntoh24(hdr->dlength); 2142 2143 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2144 pr_err("Unable to accept text parameter length: %u" 2145 "greater than MaxXmitDataSegmentLength %u.\n", 2146 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2147 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2148 (unsigned char *)hdr); 2149 } 2150 2151 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2152 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2153 pr_err("Multi sequence text commands currently not supported\n"); 2154 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2155 (unsigned char *)hdr); 2156 } 2157 2158 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2159 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2160 hdr->exp_statsn, payload_length); 2161 2162 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2163 cmd->i_state = ISTATE_SEND_TEXTRSP; 2164 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2165 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2166 cmd->targ_xfer_tag = 0xFFFFFFFF; 2167 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2168 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2169 cmd->data_direction = DMA_NONE; 2170 cmd->text_in_ptr = NULL; 2171 2172 return 0; 2173 } 2174 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2175 2176 int 2177 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2178 struct iscsi_text *hdr) 2179 { 2180 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2181 int cmdsn_ret; 2182 2183 if (!text_in) { 2184 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2185 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2186 pr_err("Unable to locate text_in buffer for sendtargets" 2187 " discovery\n"); 2188 goto reject; 2189 } 2190 goto empty_sendtargets; 2191 } 2192 if (strncmp("SendTargets", text_in, 11) != 0) { 2193 pr_err("Received Text Data that is not" 2194 " SendTargets, cannot continue.\n"); 2195 goto reject; 2196 } 2197 text_ptr = strchr(text_in, '='); 2198 if (!text_ptr) { 2199 pr_err("No \"=\" separator found in Text Data," 2200 " cannot continue.\n"); 2201 goto reject; 2202 } 2203 if (!strncmp("=All", text_ptr, 4)) { 2204 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2205 } else if (!strncmp("=iqn.", text_ptr, 5) || 2206 !strncmp("=eui.", text_ptr, 5)) { 2207 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2208 } else { 2209 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2210 goto reject; 2211 } 2212 2213 spin_lock_bh(&conn->cmd_lock); 2214 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2215 spin_unlock_bh(&conn->cmd_lock); 2216 2217 empty_sendtargets: 2218 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2219 2220 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2221 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2222 (unsigned char *)hdr, hdr->cmdsn); 2223 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2224 return -1; 2225 2226 return 0; 2227 } 2228 2229 return iscsit_execute_cmd(cmd, 0); 2230 2231 reject: 2232 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2233 (unsigned char *)hdr); 2234 } 2235 EXPORT_SYMBOL(iscsit_process_text_cmd); 2236 2237 static int 2238 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2239 unsigned char *buf) 2240 { 2241 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2242 char *text_in = NULL; 2243 u32 payload_length = ntoh24(hdr->dlength); 2244 int rx_size, rc; 2245 2246 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2247 if (rc < 0) 2248 return 0; 2249 2250 rx_size = payload_length; 2251 if (payload_length) { 2252 u32 checksum = 0, data_crc = 0; 2253 u32 padding = 0, pad_bytes = 0; 2254 int niov = 0, rx_got; 2255 struct kvec iov[3]; 2256 2257 text_in = kzalloc(payload_length, GFP_KERNEL); 2258 if (!text_in) 2259 goto reject; 2260 2261 cmd->text_in_ptr = text_in; 2262 2263 memset(iov, 0, 3 * sizeof(struct kvec)); 2264 iov[niov].iov_base = text_in; 2265 iov[niov++].iov_len = payload_length; 2266 2267 padding = ((-payload_length) & 3); 2268 if (padding != 0) { 2269 iov[niov].iov_base = &pad_bytes; 2270 iov[niov++].iov_len = padding; 2271 rx_size += padding; 2272 pr_debug("Receiving %u additional bytes" 2273 " for padding.\n", padding); 2274 } 2275 if (conn->conn_ops->DataDigest) { 2276 iov[niov].iov_base = &checksum; 2277 iov[niov++].iov_len = ISCSI_CRC_LEN; 2278 rx_size += ISCSI_CRC_LEN; 2279 } 2280 2281 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2282 if (rx_got != rx_size) 2283 goto reject; 2284 2285 if (conn->conn_ops->DataDigest) { 2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2287 text_in, payload_length, 2288 padding, (u8 *)&pad_bytes, 2289 (u8 *)&data_crc); 2290 2291 if (checksum != data_crc) { 2292 pr_err("Text data CRC32C DataDigest" 2293 " 0x%08x does not match computed" 2294 " 0x%08x\n", checksum, data_crc); 2295 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2296 pr_err("Unable to recover from" 2297 " Text Data digest failure while in" 2298 " ERL=0.\n"); 2299 goto reject; 2300 } else { 2301 /* 2302 * Silently drop this PDU and let the 2303 * initiator plug the CmdSN gap. 2304 */ 2305 pr_debug("Dropping Text" 2306 " Command CmdSN: 0x%08x due to" 2307 " DataCRC error.\n", hdr->cmdsn); 2308 kfree(text_in); 2309 return 0; 2310 } 2311 } else { 2312 pr_debug("Got CRC32C DataDigest" 2313 " 0x%08x for %u bytes of text data.\n", 2314 checksum, payload_length); 2315 } 2316 } 2317 text_in[payload_length - 1] = '\0'; 2318 pr_debug("Successfully read %d bytes of text" 2319 " data.\n", payload_length); 2320 } 2321 2322 return iscsit_process_text_cmd(conn, cmd, hdr); 2323 2324 reject: 2325 kfree(cmd->text_in_ptr); 2326 cmd->text_in_ptr = NULL; 2327 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2328 } 2329 2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2331 { 2332 struct iscsi_conn *conn_p; 2333 struct iscsi_session *sess = conn->sess; 2334 2335 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2336 " for SID: %u.\n", conn->cid, conn->sess->sid); 2337 2338 atomic_set(&sess->session_logout, 1); 2339 atomic_set(&conn->conn_logout_remove, 1); 2340 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2341 2342 iscsit_inc_conn_usage_count(conn); 2343 iscsit_inc_session_usage_count(sess); 2344 2345 spin_lock_bh(&sess->conn_lock); 2346 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2347 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2348 continue; 2349 2350 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2351 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2352 } 2353 spin_unlock_bh(&sess->conn_lock); 2354 2355 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2356 2357 return 0; 2358 } 2359 2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2361 { 2362 struct iscsi_conn *l_conn; 2363 struct iscsi_session *sess = conn->sess; 2364 2365 pr_debug("Received logout request CLOSECONNECTION for CID:" 2366 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2367 2368 /* 2369 * A Logout Request with a CLOSECONNECTION reason code for a CID 2370 * can arrive on a connection with a differing CID. 2371 */ 2372 if (conn->cid == cmd->logout_cid) { 2373 spin_lock_bh(&conn->state_lock); 2374 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2375 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2376 2377 atomic_set(&conn->conn_logout_remove, 1); 2378 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2379 iscsit_inc_conn_usage_count(conn); 2380 2381 spin_unlock_bh(&conn->state_lock); 2382 } else { 2383 /* 2384 * Handle all different cid CLOSECONNECTION requests in 2385 * iscsit_logout_post_handler_diffcid() as to give enough 2386 * time for any non immediate command's CmdSN to be 2387 * acknowledged on the connection in question. 2388 * 2389 * Here we simply make sure the CID is still around. 2390 */ 2391 l_conn = iscsit_get_conn_from_cid(sess, 2392 cmd->logout_cid); 2393 if (!l_conn) { 2394 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2395 iscsit_add_cmd_to_response_queue(cmd, conn, 2396 cmd->i_state); 2397 return 0; 2398 } 2399 2400 iscsit_dec_conn_usage_count(l_conn); 2401 } 2402 2403 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2404 2405 return 0; 2406 } 2407 2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2409 { 2410 struct iscsi_session *sess = conn->sess; 2411 2412 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2413 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2414 2415 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2416 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2417 " while ERL!=2.\n"); 2418 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2419 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2420 return 0; 2421 } 2422 2423 if (conn->cid == cmd->logout_cid) { 2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2425 " with CID: %hu on CID: %hu, implementation error.\n", 2426 cmd->logout_cid, conn->cid); 2427 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2429 return 0; 2430 } 2431 2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2433 2434 return 0; 2435 } 2436 2437 int 2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2439 unsigned char *buf) 2440 { 2441 int cmdsn_ret, logout_remove = 0; 2442 u8 reason_code = 0; 2443 struct iscsi_logout *hdr; 2444 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2445 2446 hdr = (struct iscsi_logout *) buf; 2447 reason_code = (hdr->flags & 0x7f); 2448 2449 if (tiqn) { 2450 spin_lock(&tiqn->logout_stats.lock); 2451 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2452 tiqn->logout_stats.normal_logouts++; 2453 else 2454 tiqn->logout_stats.abnormal_logouts++; 2455 spin_unlock(&tiqn->logout_stats.lock); 2456 } 2457 2458 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2459 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2460 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2461 hdr->cid, conn->cid); 2462 2463 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2464 pr_err("Received logout request on connection that" 2465 " is not in logged in state, ignoring request.\n"); 2466 iscsit_free_cmd(cmd, false); 2467 return 0; 2468 } 2469 2470 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2471 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2472 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2473 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2474 cmd->targ_xfer_tag = 0xFFFFFFFF; 2475 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2476 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2477 cmd->logout_cid = be16_to_cpu(hdr->cid); 2478 cmd->logout_reason = reason_code; 2479 cmd->data_direction = DMA_NONE; 2480 2481 /* 2482 * We need to sleep in these cases (by returning 1) until the Logout 2483 * Response gets sent in the tx thread. 2484 */ 2485 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2486 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2487 be16_to_cpu(hdr->cid) == conn->cid)) 2488 logout_remove = 1; 2489 2490 spin_lock_bh(&conn->cmd_lock); 2491 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2492 spin_unlock_bh(&conn->cmd_lock); 2493 2494 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2495 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2496 2497 /* 2498 * Immediate commands are executed, well, immediately. 2499 * Non-Immediate Logout Commands are executed in CmdSN order. 2500 */ 2501 if (cmd->immediate_cmd) { 2502 int ret = iscsit_execute_cmd(cmd, 0); 2503 2504 if (ret < 0) 2505 return ret; 2506 } else { 2507 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2508 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2509 logout_remove = 0; 2510 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2511 return -1; 2512 } 2513 2514 return logout_remove; 2515 } 2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2517 2518 int iscsit_handle_snack( 2519 struct iscsi_conn *conn, 2520 unsigned char *buf) 2521 { 2522 struct iscsi_snack *hdr; 2523 2524 hdr = (struct iscsi_snack *) buf; 2525 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2526 2527 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2528 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2529 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2530 hdr->begrun, hdr->runlength, conn->cid); 2531 2532 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2533 pr_err("Initiator sent SNACK request while in" 2534 " ErrorRecoveryLevel=0.\n"); 2535 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2536 buf); 2537 } 2538 /* 2539 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2540 * call from inside iscsi_send_recovery_datain_or_r2t(). 2541 */ 2542 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2543 case 0: 2544 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2545 hdr->itt, 2546 be32_to_cpu(hdr->ttt), 2547 be32_to_cpu(hdr->begrun), 2548 be32_to_cpu(hdr->runlength)); 2549 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2550 return iscsit_handle_status_snack(conn, hdr->itt, 2551 be32_to_cpu(hdr->ttt), 2552 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2553 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2554 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2555 be32_to_cpu(hdr->begrun), 2556 be32_to_cpu(hdr->runlength)); 2557 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2558 /* FIXME: Support R-Data SNACK */ 2559 pr_err("R-Data SNACK Not Supported.\n"); 2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2561 buf); 2562 default: 2563 pr_err("Unknown SNACK type 0x%02x, protocol" 2564 " error.\n", hdr->flags & 0x0f); 2565 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2566 buf); 2567 } 2568 2569 return 0; 2570 } 2571 EXPORT_SYMBOL(iscsit_handle_snack); 2572 2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2574 { 2575 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2576 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2577 wait_for_completion_interruptible_timeout( 2578 &conn->rx_half_close_comp, 2579 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2580 } 2581 } 2582 2583 static int iscsit_handle_immediate_data( 2584 struct iscsi_cmd *cmd, 2585 struct iscsi_scsi_req *hdr, 2586 u32 length) 2587 { 2588 int iov_ret, rx_got = 0, rx_size = 0; 2589 u32 checksum, iov_count = 0, padding = 0; 2590 struct iscsi_conn *conn = cmd->conn; 2591 struct kvec *iov; 2592 2593 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2594 if (iov_ret < 0) 2595 return IMMEDIATE_DATA_CANNOT_RECOVER; 2596 2597 rx_size = length; 2598 iov_count = iov_ret; 2599 iov = &cmd->iov_data[0]; 2600 2601 padding = ((-length) & 3); 2602 if (padding != 0) { 2603 iov[iov_count].iov_base = cmd->pad_bytes; 2604 iov[iov_count++].iov_len = padding; 2605 rx_size += padding; 2606 } 2607 2608 if (conn->conn_ops->DataDigest) { 2609 iov[iov_count].iov_base = &checksum; 2610 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2611 rx_size += ISCSI_CRC_LEN; 2612 } 2613 2614 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2615 2616 iscsit_unmap_iovec(cmd); 2617 2618 if (rx_got != rx_size) { 2619 iscsit_rx_thread_wait_for_tcp(conn); 2620 return IMMEDIATE_DATA_CANNOT_RECOVER; 2621 } 2622 2623 if (conn->conn_ops->DataDigest) { 2624 u32 data_crc; 2625 2626 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2627 cmd->write_data_done, length, padding, 2628 cmd->pad_bytes); 2629 2630 if (checksum != data_crc) { 2631 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2632 " does not match computed 0x%08x\n", checksum, 2633 data_crc); 2634 2635 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2636 pr_err("Unable to recover from" 2637 " Immediate Data digest failure while" 2638 " in ERL=0.\n"); 2639 iscsit_reject_cmd(cmd, 2640 ISCSI_REASON_DATA_DIGEST_ERROR, 2641 (unsigned char *)hdr); 2642 return IMMEDIATE_DATA_CANNOT_RECOVER; 2643 } else { 2644 iscsit_reject_cmd(cmd, 2645 ISCSI_REASON_DATA_DIGEST_ERROR, 2646 (unsigned char *)hdr); 2647 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2648 } 2649 } else { 2650 pr_debug("Got CRC32C DataDigest 0x%08x for" 2651 " %u bytes of Immediate Data\n", checksum, 2652 length); 2653 } 2654 } 2655 2656 cmd->write_data_done += length; 2657 2658 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2659 spin_lock_bh(&cmd->istate_lock); 2660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2662 spin_unlock_bh(&cmd->istate_lock); 2663 } 2664 2665 return IMMEDIATE_DATA_NORMAL_OPERATION; 2666 } 2667 2668 /* 2669 * Called with sess->conn_lock held. 2670 */ 2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2672 with active network interface */ 2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2674 { 2675 struct iscsi_cmd *cmd; 2676 struct iscsi_conn *conn_p; 2677 bool found = false; 2678 2679 /* 2680 * Only send a Asynchronous Message on connections whos network 2681 * interface is still functional. 2682 */ 2683 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2684 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2685 iscsit_inc_conn_usage_count(conn_p); 2686 found = true; 2687 break; 2688 } 2689 } 2690 2691 if (!found) 2692 return; 2693 2694 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2695 if (!cmd) { 2696 iscsit_dec_conn_usage_count(conn_p); 2697 return; 2698 } 2699 2700 cmd->logout_cid = conn->cid; 2701 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2702 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2703 2704 spin_lock_bh(&conn_p->cmd_lock); 2705 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2706 spin_unlock_bh(&conn_p->cmd_lock); 2707 2708 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2709 iscsit_dec_conn_usage_count(conn_p); 2710 } 2711 2712 static int iscsit_send_conn_drop_async_message( 2713 struct iscsi_cmd *cmd, 2714 struct iscsi_conn *conn) 2715 { 2716 struct iscsi_async *hdr; 2717 2718 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2719 2720 hdr = (struct iscsi_async *) cmd->pdu; 2721 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2722 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2723 cmd->init_task_tag = RESERVED_ITT; 2724 cmd->targ_xfer_tag = 0xFFFFFFFF; 2725 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2726 cmd->stat_sn = conn->stat_sn++; 2727 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2728 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2729 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2730 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2731 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2732 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2733 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2734 2735 pr_debug("Sending Connection Dropped Async Message StatSN:" 2736 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2737 cmd->logout_cid, conn->cid); 2738 2739 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2740 } 2741 2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2743 { 2744 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2745 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2746 wait_for_completion_interruptible_timeout( 2747 &conn->tx_half_close_comp, 2748 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2749 } 2750 } 2751 2752 void 2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2754 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2755 bool set_statsn) 2756 { 2757 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2758 hdr->flags = datain->flags; 2759 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2760 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2761 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2763 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2764 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2765 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2766 } 2767 } 2768 hton24(hdr->dlength, datain->length); 2769 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2770 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2771 (struct scsi_lun *)&hdr->lun); 2772 else 2773 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2774 2775 hdr->itt = cmd->init_task_tag; 2776 2777 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2778 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2779 else 2780 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2781 if (set_statsn) 2782 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2783 else 2784 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2785 2786 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2787 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2788 hdr->datasn = cpu_to_be32(datain->data_sn); 2789 hdr->offset = cpu_to_be32(datain->offset); 2790 2791 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2792 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2793 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2794 ntohl(hdr->offset), datain->length, conn->cid); 2795 } 2796 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2797 2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2799 { 2800 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2801 struct iscsi_datain datain; 2802 struct iscsi_datain_req *dr; 2803 int eodr = 0, ret; 2804 bool set_statsn = false; 2805 2806 memset(&datain, 0, sizeof(struct iscsi_datain)); 2807 dr = iscsit_get_datain_values(cmd, &datain); 2808 if (!dr) { 2809 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2810 cmd->init_task_tag); 2811 return -1; 2812 } 2813 /* 2814 * Be paranoid and double check the logic for now. 2815 */ 2816 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2817 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2818 " datain.length: %u exceeds cmd->data_length: %u\n", 2819 cmd->init_task_tag, datain.offset, datain.length, 2820 cmd->se_cmd.data_length); 2821 return -1; 2822 } 2823 2824 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2825 /* 2826 * Special case for successfully execution w/ both DATAIN 2827 * and Sense Data. 2828 */ 2829 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2830 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2831 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2832 else { 2833 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2834 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2835 iscsit_increment_maxcmdsn(cmd, conn->sess); 2836 cmd->stat_sn = conn->stat_sn++; 2837 set_statsn = true; 2838 } else if (dr->dr_complete == 2839 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2840 set_statsn = true; 2841 } 2842 2843 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2844 2845 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2846 if (ret < 0) 2847 return ret; 2848 2849 if (dr->dr_complete) { 2850 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2851 2 : 1; 2852 iscsit_free_datain_req(cmd, dr); 2853 } 2854 2855 return eodr; 2856 } 2857 2858 int 2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2860 struct iscsi_logout_rsp *hdr) 2861 { 2862 struct iscsi_conn *logout_conn = NULL; 2863 struct iscsi_conn_recovery *cr = NULL; 2864 struct iscsi_session *sess = conn->sess; 2865 /* 2866 * The actual shutting down of Sessions and/or Connections 2867 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2868 * is done in scsi_logout_post_handler(). 2869 */ 2870 switch (cmd->logout_reason) { 2871 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2872 pr_debug("iSCSI session logout successful, setting" 2873 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2874 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2875 break; 2876 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2877 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2878 break; 2879 /* 2880 * For CLOSECONNECTION logout requests carrying 2881 * a matching logout CID -> local CID, the reference 2882 * for the local CID will have been incremented in 2883 * iscsi_logout_closeconnection(). 2884 * 2885 * For CLOSECONNECTION logout requests carrying 2886 * a different CID than the connection it arrived 2887 * on, the connection responding to cmd->logout_cid 2888 * is stopped in iscsit_logout_post_handler_diffcid(). 2889 */ 2890 2891 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2892 " successful.\n", cmd->logout_cid, conn->cid); 2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2894 break; 2895 case ISCSI_LOGOUT_REASON_RECOVERY: 2896 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2897 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2898 break; 2899 /* 2900 * If the connection is still active from our point of view 2901 * force connection recovery to occur. 2902 */ 2903 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2904 cmd->logout_cid); 2905 if (logout_conn) { 2906 iscsit_connection_reinstatement_rcfr(logout_conn); 2907 iscsit_dec_conn_usage_count(logout_conn); 2908 } 2909 2910 cr = iscsit_get_inactive_connection_recovery_entry( 2911 conn->sess, cmd->logout_cid); 2912 if (!cr) { 2913 pr_err("Unable to locate CID: %hu for" 2914 " REMOVECONNFORRECOVERY Logout Request.\n", 2915 cmd->logout_cid); 2916 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2917 break; 2918 } 2919 2920 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2921 2922 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2923 " for recovery for CID: %hu on CID: %hu successful.\n", 2924 cmd->logout_cid, conn->cid); 2925 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2926 break; 2927 default: 2928 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2929 cmd->logout_reason); 2930 return -1; 2931 } 2932 2933 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2934 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2935 hdr->response = cmd->logout_response; 2936 hdr->itt = cmd->init_task_tag; 2937 cmd->stat_sn = conn->stat_sn++; 2938 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2939 2940 iscsit_increment_maxcmdsn(cmd, conn->sess); 2941 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2942 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2943 2944 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2945 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2946 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2947 cmd->logout_cid, conn->cid); 2948 2949 return 0; 2950 } 2951 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2952 2953 static int 2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2955 { 2956 int rc; 2957 2958 rc = iscsit_build_logout_rsp(cmd, conn, 2959 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2960 if (rc < 0) 2961 return rc; 2962 2963 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2964 } 2965 2966 void 2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2968 struct iscsi_nopin *hdr, bool nopout_response) 2969 { 2970 hdr->opcode = ISCSI_OP_NOOP_IN; 2971 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2972 hton24(hdr->dlength, cmd->buf_ptr_size); 2973 if (nopout_response) 2974 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2975 hdr->itt = cmd->init_task_tag; 2976 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2977 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2978 conn->stat_sn; 2979 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2980 2981 if (nopout_response) 2982 iscsit_increment_maxcmdsn(cmd, conn->sess); 2983 2984 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2985 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2986 2987 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2988 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2989 "Solicited" : "Unsolicited", cmd->init_task_tag, 2990 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2991 } 2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2993 2994 /* 2995 * Unsolicited NOPIN, either requesting a response or not. 2996 */ 2997 static int iscsit_send_unsolicited_nopin( 2998 struct iscsi_cmd *cmd, 2999 struct iscsi_conn *conn, 3000 int want_response) 3001 { 3002 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3003 int ret; 3004 3005 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3006 3007 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3008 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3009 3010 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3011 if (ret < 0) 3012 return ret; 3013 3014 spin_lock_bh(&cmd->istate_lock); 3015 cmd->i_state = want_response ? 3016 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3017 spin_unlock_bh(&cmd->istate_lock); 3018 3019 return 0; 3020 } 3021 3022 static int 3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3024 { 3025 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3026 3027 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3028 3029 /* 3030 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3031 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3032 */ 3033 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3034 3035 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3036 cmd->buf_ptr, 3037 cmd->buf_ptr_size); 3038 } 3039 3040 static int iscsit_send_r2t( 3041 struct iscsi_cmd *cmd, 3042 struct iscsi_conn *conn) 3043 { 3044 struct iscsi_r2t *r2t; 3045 struct iscsi_r2t_rsp *hdr; 3046 int ret; 3047 3048 r2t = iscsit_get_r2t_from_list(cmd); 3049 if (!r2t) 3050 return -1; 3051 3052 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3053 memset(hdr, 0, ISCSI_HDR_LEN); 3054 hdr->opcode = ISCSI_OP_R2T; 3055 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3056 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3057 (struct scsi_lun *)&hdr->lun); 3058 hdr->itt = cmd->init_task_tag; 3059 if (conn->conn_transport->iscsit_get_r2t_ttt) 3060 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3061 else 3062 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3063 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3064 hdr->statsn = cpu_to_be32(conn->stat_sn); 3065 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3066 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3067 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3068 hdr->data_offset = cpu_to_be32(r2t->offset); 3069 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3070 3071 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3072 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3073 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3074 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3075 r2t->offset, r2t->xfer_len, conn->cid); 3076 3077 spin_lock_bh(&cmd->r2t_lock); 3078 r2t->sent_r2t = 1; 3079 spin_unlock_bh(&cmd->r2t_lock); 3080 3081 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3082 if (ret < 0) { 3083 return ret; 3084 } 3085 3086 spin_lock_bh(&cmd->dataout_timeout_lock); 3087 iscsit_start_dataout_timer(cmd, conn); 3088 spin_unlock_bh(&cmd->dataout_timeout_lock); 3089 3090 return 0; 3091 } 3092 3093 /* 3094 * @recovery: If called from iscsi_task_reassign_complete_write() for 3095 * connection recovery. 3096 */ 3097 int iscsit_build_r2ts_for_cmd( 3098 struct iscsi_conn *conn, 3099 struct iscsi_cmd *cmd, 3100 bool recovery) 3101 { 3102 int first_r2t = 1; 3103 u32 offset = 0, xfer_len = 0; 3104 3105 spin_lock_bh(&cmd->r2t_lock); 3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3107 spin_unlock_bh(&cmd->r2t_lock); 3108 return 0; 3109 } 3110 3111 if (conn->sess->sess_ops->DataSequenceInOrder && 3112 !recovery) 3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3114 3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3116 if (conn->sess->sess_ops->DataSequenceInOrder) { 3117 offset = cmd->r2t_offset; 3118 3119 if (first_r2t && recovery) { 3120 int new_data_end = offset + 3121 conn->sess->sess_ops->MaxBurstLength - 3122 cmd->next_burst_len; 3123 3124 if (new_data_end > cmd->se_cmd.data_length) 3125 xfer_len = cmd->se_cmd.data_length - offset; 3126 else 3127 xfer_len = 3128 conn->sess->sess_ops->MaxBurstLength - 3129 cmd->next_burst_len; 3130 } else { 3131 int new_data_end = offset + 3132 conn->sess->sess_ops->MaxBurstLength; 3133 3134 if (new_data_end > cmd->se_cmd.data_length) 3135 xfer_len = cmd->se_cmd.data_length - offset; 3136 else 3137 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3138 } 3139 cmd->r2t_offset += xfer_len; 3140 3141 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3143 } else { 3144 struct iscsi_seq *seq; 3145 3146 seq = iscsit_get_seq_holder_for_r2t(cmd); 3147 if (!seq) { 3148 spin_unlock_bh(&cmd->r2t_lock); 3149 return -1; 3150 } 3151 3152 offset = seq->offset; 3153 xfer_len = seq->xfer_len; 3154 3155 if (cmd->seq_send_order == cmd->seq_count) 3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3157 } 3158 cmd->outstanding_r2ts++; 3159 first_r2t = 0; 3160 3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3162 spin_unlock_bh(&cmd->r2t_lock); 3163 return -1; 3164 } 3165 3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3167 break; 3168 } 3169 spin_unlock_bh(&cmd->r2t_lock); 3170 3171 return 0; 3172 } 3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3174 3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3176 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3177 { 3178 if (inc_stat_sn) 3179 cmd->stat_sn = conn->stat_sn++; 3180 3181 atomic_long_inc(&conn->sess->rsp_pdus); 3182 3183 memset(hdr, 0, ISCSI_HDR_LEN); 3184 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3185 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3186 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3187 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3189 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3190 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3191 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3192 } 3193 hdr->response = cmd->iscsi_response; 3194 hdr->cmd_status = cmd->se_cmd.scsi_status; 3195 hdr->itt = cmd->init_task_tag; 3196 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3197 3198 iscsit_increment_maxcmdsn(cmd, conn->sess); 3199 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3200 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3201 3202 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3203 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3204 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3205 cmd->se_cmd.scsi_status, conn->cid); 3206 } 3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3208 3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3210 { 3211 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3212 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3213 void *data_buf = NULL; 3214 u32 padding = 0, data_buf_len = 0; 3215 3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3217 3218 /* 3219 * Attach SENSE DATA payload to iSCSI Response PDU 3220 */ 3221 if (cmd->se_cmd.sense_buffer && 3222 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3223 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3224 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3225 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3226 3227 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3228 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3229 data_buf = cmd->sense_buffer; 3230 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3231 3232 if (padding) { 3233 memset(cmd->sense_buffer + 3234 cmd->se_cmd.scsi_sense_length, 0, padding); 3235 pr_debug("Adding %u bytes of padding to" 3236 " SENSE.\n", padding); 3237 } 3238 3239 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3240 " Response PDU\n", 3241 cmd->se_cmd.scsi_sense_length); 3242 } 3243 3244 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3245 data_buf_len); 3246 } 3247 3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3249 { 3250 switch (se_tmr->response) { 3251 case TMR_FUNCTION_COMPLETE: 3252 return ISCSI_TMF_RSP_COMPLETE; 3253 case TMR_TASK_DOES_NOT_EXIST: 3254 return ISCSI_TMF_RSP_NO_TASK; 3255 case TMR_LUN_DOES_NOT_EXIST: 3256 return ISCSI_TMF_RSP_NO_LUN; 3257 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3258 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3259 case TMR_FUNCTION_REJECTED: 3260 default: 3261 return ISCSI_TMF_RSP_REJECTED; 3262 } 3263 } 3264 3265 void 3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3267 struct iscsi_tm_rsp *hdr) 3268 { 3269 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3270 3271 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3272 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3273 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3274 hdr->itt = cmd->init_task_tag; 3275 cmd->stat_sn = conn->stat_sn++; 3276 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3277 3278 iscsit_increment_maxcmdsn(cmd, conn->sess); 3279 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3280 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3281 3282 pr_debug("Built Task Management Response ITT: 0x%08x," 3283 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3284 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3285 } 3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3287 3288 static int 3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3290 { 3291 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3292 3293 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3294 3295 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3296 } 3297 3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3299 { 3300 bool ret = false; 3301 3302 if (np->np_sockaddr.ss_family == AF_INET6) { 3303 const struct sockaddr_in6 sin6 = { 3304 .sin6_addr = IN6ADDR_ANY_INIT }; 3305 struct sockaddr_in6 *sock_in6 = 3306 (struct sockaddr_in6 *)&np->np_sockaddr; 3307 3308 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3309 sin6.sin6_addr.s6_addr, 16)) 3310 ret = true; 3311 } else { 3312 struct sockaddr_in * sock_in = 3313 (struct sockaddr_in *)&np->np_sockaddr; 3314 3315 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3316 ret = true; 3317 } 3318 3319 return ret; 3320 } 3321 3322 #define SENDTARGETS_BUF_LIMIT 32768U 3323 3324 static int 3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3326 enum iscsit_transport_type network_transport, 3327 int skip_bytes, bool *completed) 3328 { 3329 char *payload = NULL; 3330 struct iscsi_conn *conn = cmd->conn; 3331 struct iscsi_portal_group *tpg; 3332 struct iscsi_tiqn *tiqn; 3333 struct iscsi_tpg_np *tpg_np; 3334 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3335 int target_name_printed; 3336 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3337 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3338 bool active; 3339 3340 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3341 SENDTARGETS_BUF_LIMIT); 3342 3343 payload = kzalloc(buffer_len, GFP_KERNEL); 3344 if (!payload) 3345 return -ENOMEM; 3346 3347 /* 3348 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3349 * explicit case.. 3350 */ 3351 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3352 text_ptr = strchr(text_in, '='); 3353 if (!text_ptr) { 3354 pr_err("Unable to locate '=' string in text_in:" 3355 " %s\n", text_in); 3356 kfree(payload); 3357 return -EINVAL; 3358 } 3359 /* 3360 * Skip over '=' character.. 3361 */ 3362 text_ptr += 1; 3363 } 3364 3365 spin_lock(&tiqn_lock); 3366 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3367 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3368 strcmp(tiqn->tiqn, text_ptr)) { 3369 continue; 3370 } 3371 3372 target_name_printed = 0; 3373 3374 spin_lock(&tiqn->tiqn_tpg_lock); 3375 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3376 3377 /* If demo_mode_discovery=0 and generate_node_acls=0 3378 * (demo mode dislabed) do not return 3379 * TargetName+TargetAddress unless a NodeACL exists. 3380 */ 3381 3382 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3383 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3384 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3385 cmd->conn->sess->sess_ops->InitiatorName))) { 3386 continue; 3387 } 3388 3389 spin_lock(&tpg->tpg_state_lock); 3390 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3391 spin_unlock(&tpg->tpg_state_lock); 3392 3393 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3394 continue; 3395 3396 spin_lock(&tpg->tpg_np_lock); 3397 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3398 tpg_np_list) { 3399 struct iscsi_np *np = tpg_np->tpg_np; 3400 bool inaddr_any = iscsit_check_inaddr_any(np); 3401 struct sockaddr_storage *sockaddr; 3402 3403 if (np->np_network_transport != network_transport) 3404 continue; 3405 3406 if (!target_name_printed) { 3407 len = sprintf(buf, "TargetName=%s", 3408 tiqn->tiqn); 3409 len += 1; 3410 3411 if ((len + payload_len) > buffer_len) { 3412 spin_unlock(&tpg->tpg_np_lock); 3413 spin_unlock(&tiqn->tiqn_tpg_lock); 3414 end_of_buf = 1; 3415 goto eob; 3416 } 3417 3418 if (skip_bytes && len <= skip_bytes) { 3419 skip_bytes -= len; 3420 } else { 3421 memcpy(payload + payload_len, buf, len); 3422 payload_len += len; 3423 target_name_printed = 1; 3424 if (len > skip_bytes) 3425 skip_bytes = 0; 3426 } 3427 } 3428 3429 if (inaddr_any) 3430 sockaddr = &conn->local_sockaddr; 3431 else 3432 sockaddr = &np->np_sockaddr; 3433 3434 len = sprintf(buf, "TargetAddress=" 3435 "%pISpc,%hu", 3436 sockaddr, 3437 tpg->tpgt); 3438 len += 1; 3439 3440 if ((len + payload_len) > buffer_len) { 3441 spin_unlock(&tpg->tpg_np_lock); 3442 spin_unlock(&tiqn->tiqn_tpg_lock); 3443 end_of_buf = 1; 3444 goto eob; 3445 } 3446 3447 if (skip_bytes && len <= skip_bytes) { 3448 skip_bytes -= len; 3449 } else { 3450 memcpy(payload + payload_len, buf, len); 3451 payload_len += len; 3452 if (len > skip_bytes) 3453 skip_bytes = 0; 3454 } 3455 } 3456 spin_unlock(&tpg->tpg_np_lock); 3457 } 3458 spin_unlock(&tiqn->tiqn_tpg_lock); 3459 eob: 3460 if (end_of_buf) { 3461 *completed = false; 3462 break; 3463 } 3464 3465 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3466 break; 3467 } 3468 spin_unlock(&tiqn_lock); 3469 3470 cmd->buf_ptr = payload; 3471 3472 return payload_len; 3473 } 3474 3475 int 3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3477 struct iscsi_text_rsp *hdr, 3478 enum iscsit_transport_type network_transport) 3479 { 3480 int text_length, padding; 3481 bool completed = true; 3482 3483 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3484 cmd->read_data_done, 3485 &completed); 3486 if (text_length < 0) 3487 return text_length; 3488 3489 if (completed) { 3490 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3491 } else { 3492 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3493 cmd->read_data_done += text_length; 3494 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3495 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3496 } 3497 hdr->opcode = ISCSI_OP_TEXT_RSP; 3498 padding = ((-text_length) & 3); 3499 hton24(hdr->dlength, text_length); 3500 hdr->itt = cmd->init_task_tag; 3501 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3502 cmd->stat_sn = conn->stat_sn++; 3503 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3504 3505 iscsit_increment_maxcmdsn(cmd, conn->sess); 3506 /* 3507 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3508 * correctly increment MaxCmdSN for each response answering a 3509 * non immediate text request with a valid CmdSN. 3510 */ 3511 cmd->maxcmdsn_inc = 0; 3512 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3513 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3514 3515 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3516 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3517 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3518 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3519 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3520 3521 return text_length + padding; 3522 } 3523 EXPORT_SYMBOL(iscsit_build_text_rsp); 3524 3525 static int iscsit_send_text_rsp( 3526 struct iscsi_cmd *cmd, 3527 struct iscsi_conn *conn) 3528 { 3529 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3530 int text_length; 3531 3532 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3533 conn->conn_transport->transport_type); 3534 if (text_length < 0) 3535 return text_length; 3536 3537 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3538 cmd->buf_ptr, 3539 text_length); 3540 } 3541 3542 void 3543 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3544 struct iscsi_reject *hdr) 3545 { 3546 hdr->opcode = ISCSI_OP_REJECT; 3547 hdr->reason = cmd->reject_reason; 3548 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3549 hton24(hdr->dlength, ISCSI_HDR_LEN); 3550 hdr->ffffffff = cpu_to_be32(0xffffffff); 3551 cmd->stat_sn = conn->stat_sn++; 3552 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3553 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3554 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3555 3556 } 3557 EXPORT_SYMBOL(iscsit_build_reject); 3558 3559 static int iscsit_send_reject( 3560 struct iscsi_cmd *cmd, 3561 struct iscsi_conn *conn) 3562 { 3563 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3564 3565 iscsit_build_reject(cmd, conn, hdr); 3566 3567 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3568 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3569 3570 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3571 cmd->buf_ptr, 3572 ISCSI_HDR_LEN); 3573 } 3574 3575 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3576 { 3577 int ord, cpu; 3578 /* 3579 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3580 * within iscsit_start_kthreads() 3581 * 3582 * Here we use bitmap_id to determine which CPU that this 3583 * iSCSI connection's RX/TX threads will be scheduled to 3584 * execute upon. 3585 */ 3586 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3587 for_each_online_cpu(cpu) { 3588 if (ord-- == 0) { 3589 cpumask_set_cpu(cpu, conn->conn_cpumask); 3590 return; 3591 } 3592 } 3593 /* 3594 * This should never be reached.. 3595 */ 3596 dump_stack(); 3597 cpumask_setall(conn->conn_cpumask); 3598 } 3599 3600 int 3601 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3602 { 3603 int ret; 3604 3605 switch (state) { 3606 case ISTATE_SEND_R2T: 3607 ret = iscsit_send_r2t(cmd, conn); 3608 if (ret < 0) 3609 goto err; 3610 break; 3611 case ISTATE_REMOVE: 3612 spin_lock_bh(&conn->cmd_lock); 3613 list_del_init(&cmd->i_conn_node); 3614 spin_unlock_bh(&conn->cmd_lock); 3615 3616 iscsit_free_cmd(cmd, false); 3617 break; 3618 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3619 iscsit_mod_nopin_response_timer(conn); 3620 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3621 if (ret < 0) 3622 goto err; 3623 break; 3624 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3625 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3626 if (ret < 0) 3627 goto err; 3628 break; 3629 default: 3630 pr_err("Unknown Opcode: 0x%02x ITT:" 3631 " 0x%08x, i_state: %d on CID: %hu\n", 3632 cmd->iscsi_opcode, cmd->init_task_tag, state, 3633 conn->cid); 3634 goto err; 3635 } 3636 3637 return 0; 3638 3639 err: 3640 return -1; 3641 } 3642 EXPORT_SYMBOL(iscsit_immediate_queue); 3643 3644 static int 3645 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3646 { 3647 struct iscsit_transport *t = conn->conn_transport; 3648 struct iscsi_queue_req *qr; 3649 struct iscsi_cmd *cmd; 3650 u8 state; 3651 int ret; 3652 3653 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3654 atomic_set(&conn->check_immediate_queue, 0); 3655 cmd = qr->cmd; 3656 state = qr->state; 3657 kmem_cache_free(lio_qr_cache, qr); 3658 3659 ret = t->iscsit_immediate_queue(conn, cmd, state); 3660 if (ret < 0) 3661 return ret; 3662 } 3663 3664 return 0; 3665 } 3666 3667 int 3668 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3669 { 3670 int ret; 3671 3672 check_rsp_state: 3673 switch (state) { 3674 case ISTATE_SEND_DATAIN: 3675 ret = iscsit_send_datain(cmd, conn); 3676 if (ret < 0) 3677 goto err; 3678 else if (!ret) 3679 /* more drs */ 3680 goto check_rsp_state; 3681 else if (ret == 1) { 3682 /* all done */ 3683 spin_lock_bh(&cmd->istate_lock); 3684 cmd->i_state = ISTATE_SENT_STATUS; 3685 spin_unlock_bh(&cmd->istate_lock); 3686 3687 if (atomic_read(&conn->check_immediate_queue)) 3688 return 1; 3689 3690 return 0; 3691 } else if (ret == 2) { 3692 /* Still must send status, 3693 SCF_TRANSPORT_TASK_SENSE was set */ 3694 spin_lock_bh(&cmd->istate_lock); 3695 cmd->i_state = ISTATE_SEND_STATUS; 3696 spin_unlock_bh(&cmd->istate_lock); 3697 state = ISTATE_SEND_STATUS; 3698 goto check_rsp_state; 3699 } 3700 3701 break; 3702 case ISTATE_SEND_STATUS: 3703 case ISTATE_SEND_STATUS_RECOVERY: 3704 ret = iscsit_send_response(cmd, conn); 3705 break; 3706 case ISTATE_SEND_LOGOUTRSP: 3707 ret = iscsit_send_logout(cmd, conn); 3708 break; 3709 case ISTATE_SEND_ASYNCMSG: 3710 ret = iscsit_send_conn_drop_async_message( 3711 cmd, conn); 3712 break; 3713 case ISTATE_SEND_NOPIN: 3714 ret = iscsit_send_nopin(cmd, conn); 3715 break; 3716 case ISTATE_SEND_REJECT: 3717 ret = iscsit_send_reject(cmd, conn); 3718 break; 3719 case ISTATE_SEND_TASKMGTRSP: 3720 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3721 if (ret != 0) 3722 break; 3723 ret = iscsit_tmr_post_handler(cmd, conn); 3724 if (ret != 0) 3725 iscsit_fall_back_to_erl0(conn->sess); 3726 break; 3727 case ISTATE_SEND_TEXTRSP: 3728 ret = iscsit_send_text_rsp(cmd, conn); 3729 break; 3730 default: 3731 pr_err("Unknown Opcode: 0x%02x ITT:" 3732 " 0x%08x, i_state: %d on CID: %hu\n", 3733 cmd->iscsi_opcode, cmd->init_task_tag, 3734 state, conn->cid); 3735 goto err; 3736 } 3737 if (ret < 0) 3738 goto err; 3739 3740 switch (state) { 3741 case ISTATE_SEND_LOGOUTRSP: 3742 if (!iscsit_logout_post_handler(cmd, conn)) 3743 return -ECONNRESET; 3744 /* fall through */ 3745 case ISTATE_SEND_STATUS: 3746 case ISTATE_SEND_ASYNCMSG: 3747 case ISTATE_SEND_NOPIN: 3748 case ISTATE_SEND_STATUS_RECOVERY: 3749 case ISTATE_SEND_TEXTRSP: 3750 case ISTATE_SEND_TASKMGTRSP: 3751 case ISTATE_SEND_REJECT: 3752 spin_lock_bh(&cmd->istate_lock); 3753 cmd->i_state = ISTATE_SENT_STATUS; 3754 spin_unlock_bh(&cmd->istate_lock); 3755 break; 3756 default: 3757 pr_err("Unknown Opcode: 0x%02x ITT:" 3758 " 0x%08x, i_state: %d on CID: %hu\n", 3759 cmd->iscsi_opcode, cmd->init_task_tag, 3760 cmd->i_state, conn->cid); 3761 goto err; 3762 } 3763 3764 if (atomic_read(&conn->check_immediate_queue)) 3765 return 1; 3766 3767 return 0; 3768 3769 err: 3770 return -1; 3771 } 3772 EXPORT_SYMBOL(iscsit_response_queue); 3773 3774 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3775 { 3776 struct iscsit_transport *t = conn->conn_transport; 3777 struct iscsi_queue_req *qr; 3778 struct iscsi_cmd *cmd; 3779 u8 state; 3780 int ret; 3781 3782 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3783 cmd = qr->cmd; 3784 state = qr->state; 3785 kmem_cache_free(lio_qr_cache, qr); 3786 3787 ret = t->iscsit_response_queue(conn, cmd, state); 3788 if (ret == 1 || ret < 0) 3789 return ret; 3790 } 3791 3792 return 0; 3793 } 3794 3795 int iscsi_target_tx_thread(void *arg) 3796 { 3797 int ret = 0; 3798 struct iscsi_conn *conn = arg; 3799 bool conn_freed = false; 3800 3801 /* 3802 * Allow ourselves to be interrupted by SIGINT so that a 3803 * connection recovery / failure event can be triggered externally. 3804 */ 3805 allow_signal(SIGINT); 3806 3807 while (!kthread_should_stop()) { 3808 /* 3809 * Ensure that both TX and RX per connection kthreads 3810 * are scheduled to run on the same CPU. 3811 */ 3812 iscsit_thread_check_cpumask(conn, current, 1); 3813 3814 wait_event_interruptible(conn->queues_wq, 3815 !iscsit_conn_all_queues_empty(conn)); 3816 3817 if (signal_pending(current)) 3818 goto transport_err; 3819 3820 get_immediate: 3821 ret = iscsit_handle_immediate_queue(conn); 3822 if (ret < 0) 3823 goto transport_err; 3824 3825 ret = iscsit_handle_response_queue(conn); 3826 if (ret == 1) { 3827 goto get_immediate; 3828 } else if (ret == -ECONNRESET) { 3829 conn_freed = true; 3830 goto out; 3831 } else if (ret < 0) { 3832 goto transport_err; 3833 } 3834 } 3835 3836 transport_err: 3837 /* 3838 * Avoid the normal connection failure code-path if this connection 3839 * is still within LOGIN mode, and iscsi_np process context is 3840 * responsible for cleaning up the early connection failure. 3841 */ 3842 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3843 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3844 out: 3845 if (!conn_freed) { 3846 while (!kthread_should_stop()) { 3847 msleep(100); 3848 } 3849 } 3850 return 0; 3851 } 3852 3853 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3854 { 3855 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3856 struct iscsi_cmd *cmd; 3857 int ret = 0; 3858 3859 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3860 case ISCSI_OP_SCSI_CMD: 3861 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3862 if (!cmd) 3863 goto reject; 3864 3865 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3866 break; 3867 case ISCSI_OP_SCSI_DATA_OUT: 3868 ret = iscsit_handle_data_out(conn, buf); 3869 break; 3870 case ISCSI_OP_NOOP_OUT: 3871 cmd = NULL; 3872 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3874 if (!cmd) 3875 goto reject; 3876 } 3877 ret = iscsit_handle_nop_out(conn, cmd, buf); 3878 break; 3879 case ISCSI_OP_SCSI_TMFUNC: 3880 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3881 if (!cmd) 3882 goto reject; 3883 3884 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3885 break; 3886 case ISCSI_OP_TEXT: 3887 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3888 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3889 if (!cmd) 3890 goto reject; 3891 } else { 3892 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3893 if (!cmd) 3894 goto reject; 3895 } 3896 3897 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3898 break; 3899 case ISCSI_OP_LOGOUT: 3900 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3901 if (!cmd) 3902 goto reject; 3903 3904 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3905 if (ret > 0) 3906 wait_for_completion_timeout(&conn->conn_logout_comp, 3907 SECONDS_FOR_LOGOUT_COMP * HZ); 3908 break; 3909 case ISCSI_OP_SNACK: 3910 ret = iscsit_handle_snack(conn, buf); 3911 break; 3912 default: 3913 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3914 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3915 pr_err("Cannot recover from unknown" 3916 " opcode while ERL=0, closing iSCSI connection.\n"); 3917 return -1; 3918 } 3919 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3920 " closing iSCSI connection.\n"); 3921 ret = -1; 3922 break; 3923 } 3924 3925 return ret; 3926 reject: 3927 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3928 } 3929 3930 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3931 { 3932 bool ret; 3933 3934 spin_lock_bh(&conn->state_lock); 3935 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3936 spin_unlock_bh(&conn->state_lock); 3937 3938 return ret; 3939 } 3940 3941 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3942 { 3943 int ret; 3944 u8 buffer[ISCSI_HDR_LEN], opcode; 3945 u32 checksum = 0, digest = 0; 3946 struct kvec iov; 3947 3948 while (!kthread_should_stop()) { 3949 /* 3950 * Ensure that both TX and RX per connection kthreads 3951 * are scheduled to run on the same CPU. 3952 */ 3953 iscsit_thread_check_cpumask(conn, current, 0); 3954 3955 memset(buffer, 0, ISCSI_HDR_LEN); 3956 memset(&iov, 0, sizeof(struct kvec)); 3957 3958 iov.iov_base = buffer; 3959 iov.iov_len = ISCSI_HDR_LEN; 3960 3961 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3962 if (ret != ISCSI_HDR_LEN) { 3963 iscsit_rx_thread_wait_for_tcp(conn); 3964 return; 3965 } 3966 3967 if (conn->conn_ops->HeaderDigest) { 3968 iov.iov_base = &digest; 3969 iov.iov_len = ISCSI_CRC_LEN; 3970 3971 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3972 if (ret != ISCSI_CRC_LEN) { 3973 iscsit_rx_thread_wait_for_tcp(conn); 3974 return; 3975 } 3976 3977 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 3978 buffer, ISCSI_HDR_LEN, 3979 0, NULL, (u8 *)&checksum); 3980 3981 if (digest != checksum) { 3982 pr_err("HeaderDigest CRC32C failed," 3983 " received 0x%08x, computed 0x%08x\n", 3984 digest, checksum); 3985 /* 3986 * Set the PDU to 0xff so it will intentionally 3987 * hit default in the switch below. 3988 */ 3989 memset(buffer, 0xff, ISCSI_HDR_LEN); 3990 atomic_long_inc(&conn->sess->conn_digest_errors); 3991 } else { 3992 pr_debug("Got HeaderDigest CRC32C" 3993 " 0x%08x\n", checksum); 3994 } 3995 } 3996 3997 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3998 return; 3999 4000 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4001 4002 if (conn->sess->sess_ops->SessionType && 4003 ((!(opcode & ISCSI_OP_TEXT)) || 4004 (!(opcode & ISCSI_OP_LOGOUT)))) { 4005 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4006 " while in Discovery Session, rejecting.\n", opcode); 4007 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4008 buffer); 4009 return; 4010 } 4011 4012 ret = iscsi_target_rx_opcode(conn, buffer); 4013 if (ret < 0) 4014 return; 4015 } 4016 } 4017 4018 int iscsi_target_rx_thread(void *arg) 4019 { 4020 int rc; 4021 struct iscsi_conn *conn = arg; 4022 bool conn_freed = false; 4023 4024 /* 4025 * Allow ourselves to be interrupted by SIGINT so that a 4026 * connection recovery / failure event can be triggered externally. 4027 */ 4028 allow_signal(SIGINT); 4029 /* 4030 * Wait for iscsi_post_login_handler() to complete before allowing 4031 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4032 */ 4033 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4034 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4035 goto out; 4036 4037 if (!conn->conn_transport->iscsit_get_rx_pdu) 4038 return 0; 4039 4040 conn->conn_transport->iscsit_get_rx_pdu(conn); 4041 4042 if (!signal_pending(current)) 4043 atomic_set(&conn->transport_failed, 1); 4044 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4045 4046 out: 4047 if (!conn_freed) { 4048 while (!kthread_should_stop()) { 4049 msleep(100); 4050 } 4051 } 4052 4053 return 0; 4054 } 4055 4056 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4057 { 4058 LIST_HEAD(tmp_list); 4059 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4060 struct iscsi_session *sess = conn->sess; 4061 /* 4062 * We expect this function to only ever be called from either RX or TX 4063 * thread context via iscsit_close_connection() once the other context 4064 * has been reset -> returned sleeping pre-handler state. 4065 */ 4066 spin_lock_bh(&conn->cmd_lock); 4067 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4068 4069 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4070 struct se_cmd *se_cmd = &cmd->se_cmd; 4071 4072 if (se_cmd->se_tfo != NULL) { 4073 spin_lock(&se_cmd->t_state_lock); 4074 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4075 spin_unlock(&se_cmd->t_state_lock); 4076 } 4077 } 4078 spin_unlock_bh(&conn->cmd_lock); 4079 4080 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4081 list_del_init(&cmd->i_conn_node); 4082 4083 iscsit_increment_maxcmdsn(cmd, sess); 4084 iscsit_free_cmd(cmd, true); 4085 4086 } 4087 } 4088 4089 static void iscsit_stop_timers_for_cmds( 4090 struct iscsi_conn *conn) 4091 { 4092 struct iscsi_cmd *cmd; 4093 4094 spin_lock_bh(&conn->cmd_lock); 4095 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4096 if (cmd->data_direction == DMA_TO_DEVICE) 4097 iscsit_stop_dataout_timer(cmd); 4098 } 4099 spin_unlock_bh(&conn->cmd_lock); 4100 } 4101 4102 int iscsit_close_connection( 4103 struct iscsi_conn *conn) 4104 { 4105 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4106 struct iscsi_session *sess = conn->sess; 4107 4108 pr_debug("Closing iSCSI connection CID %hu on SID:" 4109 " %u\n", conn->cid, sess->sid); 4110 /* 4111 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4112 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4113 * sleeping and the logout response never got sent because the 4114 * connection failed. 4115 * 4116 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4117 * to signal logout response TX interrupt completion. Go ahead and skip 4118 * this for iser since isert_rx_opcode() does not wait on logout failure, 4119 * and to avoid iscsi_conn pointer dereference in iser-target code. 4120 */ 4121 if (!conn->conn_transport->rdma_shutdown) 4122 complete(&conn->conn_logout_comp); 4123 4124 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4125 if (conn->tx_thread && 4126 cmpxchg(&conn->tx_thread_active, true, false)) { 4127 send_sig(SIGINT, conn->tx_thread, 1); 4128 kthread_stop(conn->tx_thread); 4129 } 4130 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4131 if (conn->rx_thread && 4132 cmpxchg(&conn->rx_thread_active, true, false)) { 4133 send_sig(SIGINT, conn->rx_thread, 1); 4134 kthread_stop(conn->rx_thread); 4135 } 4136 } 4137 4138 spin_lock(&iscsit_global->ts_bitmap_lock); 4139 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4140 get_order(1)); 4141 spin_unlock(&iscsit_global->ts_bitmap_lock); 4142 4143 iscsit_stop_timers_for_cmds(conn); 4144 iscsit_stop_nopin_response_timer(conn); 4145 iscsit_stop_nopin_timer(conn); 4146 4147 if (conn->conn_transport->iscsit_wait_conn) 4148 conn->conn_transport->iscsit_wait_conn(conn); 4149 4150 /* 4151 * During Connection recovery drop unacknowledged out of order 4152 * commands for this connection, and prepare the other commands 4153 * for reallegiance. 4154 * 4155 * During normal operation clear the out of order commands (but 4156 * do not free the struct iscsi_ooo_cmdsn's) and release all 4157 * struct iscsi_cmds. 4158 */ 4159 if (atomic_read(&conn->connection_recovery)) { 4160 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4161 iscsit_prepare_cmds_for_reallegiance(conn); 4162 } else { 4163 iscsit_clear_ooo_cmdsns_for_conn(conn); 4164 iscsit_release_commands_from_conn(conn); 4165 } 4166 iscsit_free_queue_reqs_for_conn(conn); 4167 4168 /* 4169 * Handle decrementing session or connection usage count if 4170 * a logout response was not able to be sent because the 4171 * connection failed. Fall back to Session Recovery here. 4172 */ 4173 if (atomic_read(&conn->conn_logout_remove)) { 4174 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4175 iscsit_dec_conn_usage_count(conn); 4176 iscsit_dec_session_usage_count(sess); 4177 } 4178 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4179 iscsit_dec_conn_usage_count(conn); 4180 4181 atomic_set(&conn->conn_logout_remove, 0); 4182 atomic_set(&sess->session_reinstatement, 0); 4183 atomic_set(&sess->session_fall_back_to_erl0, 1); 4184 } 4185 4186 spin_lock_bh(&sess->conn_lock); 4187 list_del(&conn->conn_list); 4188 4189 /* 4190 * Attempt to let the Initiator know this connection failed by 4191 * sending an Connection Dropped Async Message on another 4192 * active connection. 4193 */ 4194 if (atomic_read(&conn->connection_recovery)) 4195 iscsit_build_conn_drop_async_message(conn); 4196 4197 spin_unlock_bh(&sess->conn_lock); 4198 4199 /* 4200 * If connection reinstatement is being performed on this connection, 4201 * up the connection reinstatement semaphore that is being blocked on 4202 * in iscsit_cause_connection_reinstatement(). 4203 */ 4204 spin_lock_bh(&conn->state_lock); 4205 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4206 spin_unlock_bh(&conn->state_lock); 4207 complete(&conn->conn_wait_comp); 4208 wait_for_completion(&conn->conn_post_wait_comp); 4209 spin_lock_bh(&conn->state_lock); 4210 } 4211 4212 /* 4213 * If connection reinstatement is being performed on this connection 4214 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4215 * connection wait rcfr semaphore that is being blocked on 4216 * an iscsit_connection_reinstatement_rcfr(). 4217 */ 4218 if (atomic_read(&conn->connection_wait_rcfr)) { 4219 spin_unlock_bh(&conn->state_lock); 4220 complete(&conn->conn_wait_rcfr_comp); 4221 wait_for_completion(&conn->conn_post_wait_comp); 4222 spin_lock_bh(&conn->state_lock); 4223 } 4224 atomic_set(&conn->connection_reinstatement, 1); 4225 spin_unlock_bh(&conn->state_lock); 4226 4227 /* 4228 * If any other processes are accessing this connection pointer we 4229 * must wait until they have completed. 4230 */ 4231 iscsit_check_conn_usage_count(conn); 4232 4233 ahash_request_free(conn->conn_tx_hash); 4234 if (conn->conn_rx_hash) { 4235 struct crypto_ahash *tfm; 4236 4237 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4238 ahash_request_free(conn->conn_rx_hash); 4239 crypto_free_ahash(tfm); 4240 } 4241 4242 free_cpumask_var(conn->conn_cpumask); 4243 4244 kfree(conn->conn_ops); 4245 conn->conn_ops = NULL; 4246 4247 if (conn->sock) 4248 sock_release(conn->sock); 4249 4250 if (conn->conn_transport->iscsit_free_conn) 4251 conn->conn_transport->iscsit_free_conn(conn); 4252 4253 iscsit_put_transport(conn->conn_transport); 4254 4255 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4256 conn->conn_state = TARG_CONN_STATE_FREE; 4257 kfree(conn); 4258 4259 spin_lock_bh(&sess->conn_lock); 4260 atomic_dec(&sess->nconn); 4261 pr_debug("Decremented iSCSI connection count to %hu from node:" 4262 " %s\n", atomic_read(&sess->nconn), 4263 sess->sess_ops->InitiatorName); 4264 /* 4265 * Make sure that if one connection fails in an non ERL=2 iSCSI 4266 * Session that they all fail. 4267 */ 4268 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4269 !atomic_read(&sess->session_logout)) 4270 atomic_set(&sess->session_fall_back_to_erl0, 1); 4271 4272 /* 4273 * If this was not the last connection in the session, and we are 4274 * performing session reinstatement or falling back to ERL=0, call 4275 * iscsit_stop_session() without sleeping to shutdown the other 4276 * active connections. 4277 */ 4278 if (atomic_read(&sess->nconn)) { 4279 if (!atomic_read(&sess->session_reinstatement) && 4280 !atomic_read(&sess->session_fall_back_to_erl0)) { 4281 spin_unlock_bh(&sess->conn_lock); 4282 return 0; 4283 } 4284 if (!atomic_read(&sess->session_stop_active)) { 4285 atomic_set(&sess->session_stop_active, 1); 4286 spin_unlock_bh(&sess->conn_lock); 4287 iscsit_stop_session(sess, 0, 0); 4288 return 0; 4289 } 4290 spin_unlock_bh(&sess->conn_lock); 4291 return 0; 4292 } 4293 4294 /* 4295 * If this was the last connection in the session and one of the 4296 * following is occurring: 4297 * 4298 * Session Reinstatement is not being performed, and are falling back 4299 * to ERL=0 call iscsit_close_session(). 4300 * 4301 * Session Logout was requested. iscsit_close_session() will be called 4302 * elsewhere. 4303 * 4304 * Session Continuation is not being performed, start the Time2Retain 4305 * handler and check if sleep_on_sess_wait_sem is active. 4306 */ 4307 if (!atomic_read(&sess->session_reinstatement) && 4308 atomic_read(&sess->session_fall_back_to_erl0)) { 4309 spin_unlock_bh(&sess->conn_lock); 4310 iscsit_close_session(sess); 4311 4312 return 0; 4313 } else if (atomic_read(&sess->session_logout)) { 4314 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4315 sess->session_state = TARG_SESS_STATE_FREE; 4316 spin_unlock_bh(&sess->conn_lock); 4317 4318 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4319 complete(&sess->session_wait_comp); 4320 4321 return 0; 4322 } else { 4323 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4324 sess->session_state = TARG_SESS_STATE_FAILED; 4325 4326 if (!atomic_read(&sess->session_continuation)) { 4327 spin_unlock_bh(&sess->conn_lock); 4328 iscsit_start_time2retain_handler(sess); 4329 } else 4330 spin_unlock_bh(&sess->conn_lock); 4331 4332 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4333 complete(&sess->session_wait_comp); 4334 4335 return 0; 4336 } 4337 } 4338 4339 /* 4340 * If the iSCSI Session for the iSCSI Initiator Node exists, 4341 * forcefully shutdown the iSCSI NEXUS. 4342 */ 4343 int iscsit_close_session(struct iscsi_session *sess) 4344 { 4345 struct iscsi_portal_group *tpg = sess->tpg; 4346 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4347 4348 if (atomic_read(&sess->nconn)) { 4349 pr_err("%d connection(s) still exist for iSCSI session" 4350 " to %s\n", atomic_read(&sess->nconn), 4351 sess->sess_ops->InitiatorName); 4352 BUG(); 4353 } 4354 4355 spin_lock_bh(&se_tpg->session_lock); 4356 atomic_set(&sess->session_logout, 1); 4357 atomic_set(&sess->session_reinstatement, 1); 4358 iscsit_stop_time2retain_timer(sess); 4359 spin_unlock_bh(&se_tpg->session_lock); 4360 4361 /* 4362 * transport_deregister_session_configfs() will clear the 4363 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4364 * can be setting it again with __transport_register_session() in 4365 * iscsi_post_login_handler() again after the iscsit_stop_session() 4366 * completes in iscsi_np context. 4367 */ 4368 transport_deregister_session_configfs(sess->se_sess); 4369 4370 /* 4371 * If any other processes are accessing this session pointer we must 4372 * wait until they have completed. If we are in an interrupt (the 4373 * time2retain handler) and contain and active session usage count we 4374 * restart the timer and exit. 4375 */ 4376 if (!in_interrupt()) { 4377 if (iscsit_check_session_usage_count(sess) == 1) 4378 iscsit_stop_session(sess, 1, 1); 4379 } else { 4380 if (iscsit_check_session_usage_count(sess) == 2) { 4381 atomic_set(&sess->session_logout, 0); 4382 iscsit_start_time2retain_handler(sess); 4383 return 0; 4384 } 4385 } 4386 4387 transport_deregister_session(sess->se_sess); 4388 4389 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4390 iscsit_free_connection_recovery_entires(sess); 4391 4392 iscsit_free_all_ooo_cmdsns(sess); 4393 4394 spin_lock_bh(&se_tpg->session_lock); 4395 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4396 sess->session_state = TARG_SESS_STATE_FREE; 4397 pr_debug("Released iSCSI session from node: %s\n", 4398 sess->sess_ops->InitiatorName); 4399 tpg->nsessions--; 4400 if (tpg->tpg_tiqn) 4401 tpg->tpg_tiqn->tiqn_nsessions--; 4402 4403 pr_debug("Decremented number of active iSCSI Sessions on" 4404 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4405 4406 spin_lock(&sess_idr_lock); 4407 idr_remove(&sess_idr, sess->session_index); 4408 spin_unlock(&sess_idr_lock); 4409 4410 kfree(sess->sess_ops); 4411 sess->sess_ops = NULL; 4412 spin_unlock_bh(&se_tpg->session_lock); 4413 4414 kfree(sess); 4415 return 0; 4416 } 4417 4418 static void iscsit_logout_post_handler_closesession( 4419 struct iscsi_conn *conn) 4420 { 4421 struct iscsi_session *sess = conn->sess; 4422 int sleep = 1; 4423 /* 4424 * Traditional iscsi/tcp will invoke this logic from TX thread 4425 * context during session logout, so clear tx_thread_active and 4426 * sleep if iscsit_close_connection() has not already occured. 4427 * 4428 * Since iser-target invokes this logic from it's own workqueue, 4429 * always sleep waiting for RX/TX thread shutdown to complete 4430 * within iscsit_close_connection(). 4431 */ 4432 if (!conn->conn_transport->rdma_shutdown) { 4433 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4434 if (!sleep) 4435 return; 4436 } 4437 4438 atomic_set(&conn->conn_logout_remove, 0); 4439 complete(&conn->conn_logout_comp); 4440 4441 iscsit_dec_conn_usage_count(conn); 4442 iscsit_stop_session(sess, sleep, sleep); 4443 iscsit_dec_session_usage_count(sess); 4444 iscsit_close_session(sess); 4445 } 4446 4447 static void iscsit_logout_post_handler_samecid( 4448 struct iscsi_conn *conn) 4449 { 4450 int sleep = 1; 4451 4452 if (!conn->conn_transport->rdma_shutdown) { 4453 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4454 if (!sleep) 4455 return; 4456 } 4457 4458 atomic_set(&conn->conn_logout_remove, 0); 4459 complete(&conn->conn_logout_comp); 4460 4461 iscsit_cause_connection_reinstatement(conn, sleep); 4462 iscsit_dec_conn_usage_count(conn); 4463 } 4464 4465 static void iscsit_logout_post_handler_diffcid( 4466 struct iscsi_conn *conn, 4467 u16 cid) 4468 { 4469 struct iscsi_conn *l_conn; 4470 struct iscsi_session *sess = conn->sess; 4471 bool conn_found = false; 4472 4473 if (!sess) 4474 return; 4475 4476 spin_lock_bh(&sess->conn_lock); 4477 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4478 if (l_conn->cid == cid) { 4479 iscsit_inc_conn_usage_count(l_conn); 4480 conn_found = true; 4481 break; 4482 } 4483 } 4484 spin_unlock_bh(&sess->conn_lock); 4485 4486 if (!conn_found) 4487 return; 4488 4489 if (l_conn->sock) 4490 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4491 4492 spin_lock_bh(&l_conn->state_lock); 4493 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4494 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4495 spin_unlock_bh(&l_conn->state_lock); 4496 4497 iscsit_cause_connection_reinstatement(l_conn, 1); 4498 iscsit_dec_conn_usage_count(l_conn); 4499 } 4500 4501 /* 4502 * Return of 0 causes the TX thread to restart. 4503 */ 4504 int iscsit_logout_post_handler( 4505 struct iscsi_cmd *cmd, 4506 struct iscsi_conn *conn) 4507 { 4508 int ret = 0; 4509 4510 switch (cmd->logout_reason) { 4511 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4512 switch (cmd->logout_response) { 4513 case ISCSI_LOGOUT_SUCCESS: 4514 case ISCSI_LOGOUT_CLEANUP_FAILED: 4515 default: 4516 iscsit_logout_post_handler_closesession(conn); 4517 break; 4518 } 4519 ret = 0; 4520 break; 4521 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4522 if (conn->cid == cmd->logout_cid) { 4523 switch (cmd->logout_response) { 4524 case ISCSI_LOGOUT_SUCCESS: 4525 case ISCSI_LOGOUT_CLEANUP_FAILED: 4526 default: 4527 iscsit_logout_post_handler_samecid(conn); 4528 break; 4529 } 4530 ret = 0; 4531 } else { 4532 switch (cmd->logout_response) { 4533 case ISCSI_LOGOUT_SUCCESS: 4534 iscsit_logout_post_handler_diffcid(conn, 4535 cmd->logout_cid); 4536 break; 4537 case ISCSI_LOGOUT_CID_NOT_FOUND: 4538 case ISCSI_LOGOUT_CLEANUP_FAILED: 4539 default: 4540 break; 4541 } 4542 ret = 1; 4543 } 4544 break; 4545 case ISCSI_LOGOUT_REASON_RECOVERY: 4546 switch (cmd->logout_response) { 4547 case ISCSI_LOGOUT_SUCCESS: 4548 case ISCSI_LOGOUT_CID_NOT_FOUND: 4549 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4550 case ISCSI_LOGOUT_CLEANUP_FAILED: 4551 default: 4552 break; 4553 } 4554 ret = 1; 4555 break; 4556 default: 4557 break; 4558 4559 } 4560 return ret; 4561 } 4562 EXPORT_SYMBOL(iscsit_logout_post_handler); 4563 4564 void iscsit_fail_session(struct iscsi_session *sess) 4565 { 4566 struct iscsi_conn *conn; 4567 4568 spin_lock_bh(&sess->conn_lock); 4569 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4570 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4571 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4572 } 4573 spin_unlock_bh(&sess->conn_lock); 4574 4575 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4576 sess->session_state = TARG_SESS_STATE_FAILED; 4577 } 4578 4579 int iscsit_free_session(struct iscsi_session *sess) 4580 { 4581 u16 conn_count = atomic_read(&sess->nconn); 4582 struct iscsi_conn *conn, *conn_tmp = NULL; 4583 int is_last; 4584 4585 spin_lock_bh(&sess->conn_lock); 4586 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4587 4588 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4589 conn_list) { 4590 if (conn_count == 0) 4591 break; 4592 4593 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4594 is_last = 1; 4595 } else { 4596 iscsit_inc_conn_usage_count(conn_tmp); 4597 is_last = 0; 4598 } 4599 iscsit_inc_conn_usage_count(conn); 4600 4601 spin_unlock_bh(&sess->conn_lock); 4602 iscsit_cause_connection_reinstatement(conn, 1); 4603 spin_lock_bh(&sess->conn_lock); 4604 4605 iscsit_dec_conn_usage_count(conn); 4606 if (is_last == 0) 4607 iscsit_dec_conn_usage_count(conn_tmp); 4608 4609 conn_count--; 4610 } 4611 4612 if (atomic_read(&sess->nconn)) { 4613 spin_unlock_bh(&sess->conn_lock); 4614 wait_for_completion(&sess->session_wait_comp); 4615 } else 4616 spin_unlock_bh(&sess->conn_lock); 4617 4618 iscsit_close_session(sess); 4619 return 0; 4620 } 4621 4622 void iscsit_stop_session( 4623 struct iscsi_session *sess, 4624 int session_sleep, 4625 int connection_sleep) 4626 { 4627 u16 conn_count = atomic_read(&sess->nconn); 4628 struct iscsi_conn *conn, *conn_tmp = NULL; 4629 int is_last; 4630 4631 spin_lock_bh(&sess->conn_lock); 4632 if (session_sleep) 4633 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4634 4635 if (connection_sleep) { 4636 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4637 conn_list) { 4638 if (conn_count == 0) 4639 break; 4640 4641 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4642 is_last = 1; 4643 } else { 4644 iscsit_inc_conn_usage_count(conn_tmp); 4645 is_last = 0; 4646 } 4647 iscsit_inc_conn_usage_count(conn); 4648 4649 spin_unlock_bh(&sess->conn_lock); 4650 iscsit_cause_connection_reinstatement(conn, 1); 4651 spin_lock_bh(&sess->conn_lock); 4652 4653 iscsit_dec_conn_usage_count(conn); 4654 if (is_last == 0) 4655 iscsit_dec_conn_usage_count(conn_tmp); 4656 conn_count--; 4657 } 4658 } else { 4659 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4660 iscsit_cause_connection_reinstatement(conn, 0); 4661 } 4662 4663 if (session_sleep && atomic_read(&sess->nconn)) { 4664 spin_unlock_bh(&sess->conn_lock); 4665 wait_for_completion(&sess->session_wait_comp); 4666 } else 4667 spin_unlock_bh(&sess->conn_lock); 4668 } 4669 4670 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4671 { 4672 struct iscsi_session *sess; 4673 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4674 struct se_session *se_sess, *se_sess_tmp; 4675 LIST_HEAD(free_list); 4676 int session_count = 0; 4677 4678 spin_lock_bh(&se_tpg->session_lock); 4679 if (tpg->nsessions && !force) { 4680 spin_unlock_bh(&se_tpg->session_lock); 4681 return -1; 4682 } 4683 4684 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4685 sess_list) { 4686 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4687 4688 spin_lock(&sess->conn_lock); 4689 if (atomic_read(&sess->session_fall_back_to_erl0) || 4690 atomic_read(&sess->session_logout) || 4691 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4692 spin_unlock(&sess->conn_lock); 4693 continue; 4694 } 4695 atomic_set(&sess->session_reinstatement, 1); 4696 atomic_set(&sess->session_fall_back_to_erl0, 1); 4697 spin_unlock(&sess->conn_lock); 4698 4699 list_move_tail(&se_sess->sess_list, &free_list); 4700 } 4701 spin_unlock_bh(&se_tpg->session_lock); 4702 4703 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4704 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4705 4706 iscsit_free_session(sess); 4707 session_count++; 4708 } 4709 4710 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4711 " Group: %hu\n", session_count, tpg->tpgt); 4712 return 0; 4713 } 4714 4715 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4716 MODULE_VERSION("4.1.x"); 4717 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4718 MODULE_LICENSE("GPL"); 4719 4720 module_init(iscsi_target_init_module); 4721 module_exit(iscsi_target_cleanup_module); 4722