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 atomic_inc(&np->np_reset_count); 422 423 if (np->np_thread) { 424 spin_unlock_bh(&np->np_thread_lock); 425 send_sig(SIGINT, np->np_thread, 1); 426 wait_for_completion(&np->np_restart_comp); 427 spin_lock_bh(&np->np_thread_lock); 428 } 429 spin_unlock_bh(&np->np_thread_lock); 430 431 if (tpg_np && shutdown) { 432 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 433 434 wait_for_completion(&tpg_np->tpg_np_comp); 435 } 436 437 return 0; 438 } 439 440 static void iscsit_free_np(struct iscsi_np *np) 441 { 442 if (np->np_socket) 443 sock_release(np->np_socket); 444 } 445 446 int iscsit_del_np(struct iscsi_np *np) 447 { 448 spin_lock_bh(&np->np_thread_lock); 449 np->np_exports--; 450 if (np->np_exports) { 451 np->enabled = true; 452 spin_unlock_bh(&np->np_thread_lock); 453 return 0; 454 } 455 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 456 spin_unlock_bh(&np->np_thread_lock); 457 458 if (np->np_thread) { 459 /* 460 * We need to send the signal to wakeup Linux/Net 461 * which may be sleeping in sock_accept().. 462 */ 463 send_sig(SIGINT, np->np_thread, 1); 464 kthread_stop(np->np_thread); 465 np->np_thread = NULL; 466 } 467 468 np->np_transport->iscsit_free_np(np); 469 470 mutex_lock(&np_lock); 471 list_del(&np->np_list); 472 mutex_unlock(&np_lock); 473 474 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 475 &np->np_sockaddr, np->np_transport->name); 476 477 iscsit_put_transport(np->np_transport); 478 kfree(np); 479 return 0; 480 } 481 482 static void iscsit_get_rx_pdu(struct iscsi_conn *); 483 484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 485 { 486 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 487 } 488 EXPORT_SYMBOL(iscsit_queue_rsp); 489 490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 491 { 492 spin_lock_bh(&conn->cmd_lock); 493 if (!list_empty(&cmd->i_conn_node) && 494 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 495 list_del_init(&cmd->i_conn_node); 496 spin_unlock_bh(&conn->cmd_lock); 497 498 __iscsit_free_cmd(cmd, true); 499 } 500 EXPORT_SYMBOL(iscsit_aborted_task); 501 502 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 503 u32, u32, u8 *, u8 *); 504 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 505 506 static int 507 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 508 const void *data_buf, u32 data_buf_len) 509 { 510 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 511 struct kvec *iov; 512 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 513 int ret; 514 515 iov = &cmd->iov_misc[0]; 516 iov[niov].iov_base = cmd->pdu; 517 iov[niov++].iov_len = ISCSI_HDR_LEN; 518 519 if (conn->conn_ops->HeaderDigest) { 520 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 521 522 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 523 ISCSI_HDR_LEN, 0, NULL, 524 (u8 *)header_digest); 525 526 iov[0].iov_len += ISCSI_CRC_LEN; 527 tx_size += ISCSI_CRC_LEN; 528 pr_debug("Attaching CRC32C HeaderDigest" 529 " to opcode 0x%x 0x%08x\n", 530 hdr->opcode, *header_digest); 531 } 532 533 if (data_buf_len) { 534 u32 padding = ((-data_buf_len) & 3); 535 536 iov[niov].iov_base = (void *)data_buf; 537 iov[niov++].iov_len = data_buf_len; 538 tx_size += data_buf_len; 539 540 if (padding != 0) { 541 iov[niov].iov_base = &cmd->pad_bytes; 542 iov[niov++].iov_len = padding; 543 tx_size += padding; 544 pr_debug("Attaching %u additional" 545 " padding bytes.\n", padding); 546 } 547 548 if (conn->conn_ops->DataDigest) { 549 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 550 data_buf, data_buf_len, 551 padding, 552 (u8 *)&cmd->pad_bytes, 553 (u8 *)&cmd->data_crc); 554 555 iov[niov].iov_base = &cmd->data_crc; 556 iov[niov++].iov_len = ISCSI_CRC_LEN; 557 tx_size += ISCSI_CRC_LEN; 558 pr_debug("Attached DataDigest for %u" 559 " bytes opcode 0x%x, CRC 0x%08x\n", 560 data_buf_len, hdr->opcode, cmd->data_crc); 561 } 562 } 563 564 cmd->iov_misc_count = niov; 565 cmd->tx_size = tx_size; 566 567 ret = iscsit_send_tx_data(cmd, conn, 1); 568 if (ret < 0) { 569 iscsit_tx_thread_wait_for_tcp(conn); 570 return ret; 571 } 572 573 return 0; 574 } 575 576 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 577 static void iscsit_unmap_iovec(struct iscsi_cmd *); 578 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 579 u32, u32, u32, u8 *); 580 static int 581 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 582 const struct iscsi_datain *datain) 583 { 584 struct kvec *iov; 585 u32 iov_count = 0, tx_size = 0; 586 int ret, iov_ret; 587 588 iov = &cmd->iov_data[0]; 589 iov[iov_count].iov_base = cmd->pdu; 590 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 591 tx_size += ISCSI_HDR_LEN; 592 593 if (conn->conn_ops->HeaderDigest) { 594 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 595 596 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 597 ISCSI_HDR_LEN, 0, NULL, 598 (u8 *)header_digest); 599 600 iov[0].iov_len += ISCSI_CRC_LEN; 601 tx_size += ISCSI_CRC_LEN; 602 603 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 604 *header_digest); 605 } 606 607 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 608 datain->offset, datain->length); 609 if (iov_ret < 0) 610 return -1; 611 612 iov_count += iov_ret; 613 tx_size += datain->length; 614 615 cmd->padding = ((-datain->length) & 3); 616 if (cmd->padding) { 617 iov[iov_count].iov_base = cmd->pad_bytes; 618 iov[iov_count++].iov_len = cmd->padding; 619 tx_size += cmd->padding; 620 621 pr_debug("Attaching %u padding bytes\n", cmd->padding); 622 } 623 624 if (conn->conn_ops->DataDigest) { 625 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 626 cmd, datain->offset, 627 datain->length, 628 cmd->padding, 629 cmd->pad_bytes); 630 631 iov[iov_count].iov_base = &cmd->data_crc; 632 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 633 tx_size += ISCSI_CRC_LEN; 634 635 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 636 datain->length + cmd->padding, cmd->data_crc); 637 } 638 639 cmd->iov_data_count = iov_count; 640 cmd->tx_size = tx_size; 641 642 ret = iscsit_fe_sendpage_sg(cmd, conn); 643 644 iscsit_unmap_iovec(cmd); 645 646 if (ret < 0) { 647 iscsit_tx_thread_wait_for_tcp(conn); 648 return ret; 649 } 650 651 return 0; 652 } 653 654 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 655 struct iscsi_datain_req *dr, const void *buf, 656 u32 buf_len) 657 { 658 if (dr) 659 return iscsit_xmit_datain_pdu(conn, cmd, buf); 660 else 661 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 662 } 663 664 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 665 { 666 return TARGET_PROT_NORMAL; 667 } 668 669 static struct iscsit_transport iscsi_target_transport = { 670 .name = "iSCSI/TCP", 671 .transport_type = ISCSI_TCP, 672 .rdma_shutdown = false, 673 .owner = NULL, 674 .iscsit_setup_np = iscsit_setup_np, 675 .iscsit_accept_np = iscsit_accept_np, 676 .iscsit_free_np = iscsit_free_np, 677 .iscsit_get_login_rx = iscsit_get_login_rx, 678 .iscsit_put_login_tx = iscsit_put_login_tx, 679 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 680 .iscsit_immediate_queue = iscsit_immediate_queue, 681 .iscsit_response_queue = iscsit_response_queue, 682 .iscsit_queue_data_in = iscsit_queue_rsp, 683 .iscsit_queue_status = iscsit_queue_rsp, 684 .iscsit_aborted_task = iscsit_aborted_task, 685 .iscsit_xmit_pdu = iscsit_xmit_pdu, 686 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 687 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 688 }; 689 690 static int __init iscsi_target_init_module(void) 691 { 692 int ret = 0, size; 693 694 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 695 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 696 if (!iscsit_global) 697 return -1; 698 699 spin_lock_init(&iscsit_global->ts_bitmap_lock); 700 mutex_init(&auth_id_lock); 701 spin_lock_init(&sess_idr_lock); 702 idr_init(&tiqn_idr); 703 idr_init(&sess_idr); 704 705 ret = target_register_template(&iscsi_ops); 706 if (ret) 707 goto out; 708 709 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 710 iscsit_global->ts_bitmap = vzalloc(size); 711 if (!iscsit_global->ts_bitmap) 712 goto configfs_out; 713 714 lio_qr_cache = kmem_cache_create("lio_qr_cache", 715 sizeof(struct iscsi_queue_req), 716 __alignof__(struct iscsi_queue_req), 0, NULL); 717 if (!lio_qr_cache) { 718 pr_err("nable to kmem_cache_create() for" 719 " lio_qr_cache\n"); 720 goto bitmap_out; 721 } 722 723 lio_dr_cache = kmem_cache_create("lio_dr_cache", 724 sizeof(struct iscsi_datain_req), 725 __alignof__(struct iscsi_datain_req), 0, NULL); 726 if (!lio_dr_cache) { 727 pr_err("Unable to kmem_cache_create() for" 728 " lio_dr_cache\n"); 729 goto qr_out; 730 } 731 732 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 733 sizeof(struct iscsi_ooo_cmdsn), 734 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 735 if (!lio_ooo_cache) { 736 pr_err("Unable to kmem_cache_create() for" 737 " lio_ooo_cache\n"); 738 goto dr_out; 739 } 740 741 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 742 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 743 0, NULL); 744 if (!lio_r2t_cache) { 745 pr_err("Unable to kmem_cache_create() for" 746 " lio_r2t_cache\n"); 747 goto ooo_out; 748 } 749 750 iscsit_register_transport(&iscsi_target_transport); 751 752 if (iscsit_load_discovery_tpg() < 0) 753 goto r2t_out; 754 755 return ret; 756 r2t_out: 757 iscsit_unregister_transport(&iscsi_target_transport); 758 kmem_cache_destroy(lio_r2t_cache); 759 ooo_out: 760 kmem_cache_destroy(lio_ooo_cache); 761 dr_out: 762 kmem_cache_destroy(lio_dr_cache); 763 qr_out: 764 kmem_cache_destroy(lio_qr_cache); 765 bitmap_out: 766 vfree(iscsit_global->ts_bitmap); 767 configfs_out: 768 /* XXX: this probably wants it to be it's own unwind step.. */ 769 if (iscsit_global->discovery_tpg) 770 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 771 target_unregister_template(&iscsi_ops); 772 out: 773 kfree(iscsit_global); 774 return -ENOMEM; 775 } 776 777 static void __exit iscsi_target_cleanup_module(void) 778 { 779 iscsit_release_discovery_tpg(); 780 iscsit_unregister_transport(&iscsi_target_transport); 781 kmem_cache_destroy(lio_qr_cache); 782 kmem_cache_destroy(lio_dr_cache); 783 kmem_cache_destroy(lio_ooo_cache); 784 kmem_cache_destroy(lio_r2t_cache); 785 786 /* 787 * Shutdown discovery sessions and disable discovery TPG 788 */ 789 if (iscsit_global->discovery_tpg) 790 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 791 792 target_unregister_template(&iscsi_ops); 793 794 vfree(iscsit_global->ts_bitmap); 795 kfree(iscsit_global); 796 } 797 798 int iscsit_add_reject( 799 struct iscsi_conn *conn, 800 u8 reason, 801 unsigned char *buf) 802 { 803 struct iscsi_cmd *cmd; 804 805 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 806 if (!cmd) 807 return -1; 808 809 cmd->iscsi_opcode = ISCSI_OP_REJECT; 810 cmd->reject_reason = reason; 811 812 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 813 if (!cmd->buf_ptr) { 814 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 815 iscsit_free_cmd(cmd, false); 816 return -1; 817 } 818 819 spin_lock_bh(&conn->cmd_lock); 820 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 821 spin_unlock_bh(&conn->cmd_lock); 822 823 cmd->i_state = ISTATE_SEND_REJECT; 824 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 825 826 return -1; 827 } 828 EXPORT_SYMBOL(iscsit_add_reject); 829 830 static int iscsit_add_reject_from_cmd( 831 struct iscsi_cmd *cmd, 832 u8 reason, 833 bool add_to_conn, 834 unsigned char *buf) 835 { 836 struct iscsi_conn *conn; 837 838 if (!cmd->conn) { 839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 840 cmd->init_task_tag); 841 return -1; 842 } 843 conn = cmd->conn; 844 845 cmd->iscsi_opcode = ISCSI_OP_REJECT; 846 cmd->reject_reason = reason; 847 848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 849 if (!cmd->buf_ptr) { 850 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 851 iscsit_free_cmd(cmd, false); 852 return -1; 853 } 854 855 if (add_to_conn) { 856 spin_lock_bh(&conn->cmd_lock); 857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 858 spin_unlock_bh(&conn->cmd_lock); 859 } 860 861 cmd->i_state = ISTATE_SEND_REJECT; 862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 863 /* 864 * Perform the kref_put now if se_cmd has already been setup by 865 * scsit_setup_scsi_cmd() 866 */ 867 if (cmd->se_cmd.se_tfo != NULL) { 868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 869 target_put_sess_cmd(&cmd->se_cmd); 870 } 871 return -1; 872 } 873 874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 875 unsigned char *buf) 876 { 877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 878 } 879 880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 881 { 882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 883 } 884 EXPORT_SYMBOL(iscsit_reject_cmd); 885 886 /* 887 * Map some portion of the allocated scatterlist to an iovec, suitable for 888 * kernel sockets to copy data in/out. 889 */ 890 static int iscsit_map_iovec( 891 struct iscsi_cmd *cmd, 892 struct kvec *iov, 893 u32 data_offset, 894 u32 data_length) 895 { 896 u32 i = 0; 897 struct scatterlist *sg; 898 unsigned int page_off; 899 900 /* 901 * We know each entry in t_data_sg contains a page. 902 */ 903 u32 ent = data_offset / PAGE_SIZE; 904 905 if (ent >= cmd->se_cmd.t_data_nents) { 906 pr_err("Initial page entry out-of-bounds\n"); 907 return -1; 908 } 909 910 sg = &cmd->se_cmd.t_data_sg[ent]; 911 page_off = (data_offset % PAGE_SIZE); 912 913 cmd->first_data_sg = sg; 914 cmd->first_data_sg_off = page_off; 915 916 while (data_length) { 917 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 918 919 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 920 iov[i].iov_len = cur_len; 921 922 data_length -= cur_len; 923 page_off = 0; 924 sg = sg_next(sg); 925 i++; 926 } 927 928 cmd->kmapped_nents = i; 929 930 return i; 931 } 932 933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 934 { 935 u32 i; 936 struct scatterlist *sg; 937 938 sg = cmd->first_data_sg; 939 940 for (i = 0; i < cmd->kmapped_nents; i++) 941 kunmap(sg_page(&sg[i])); 942 } 943 944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 945 { 946 LIST_HEAD(ack_list); 947 struct iscsi_cmd *cmd, *cmd_p; 948 949 conn->exp_statsn = exp_statsn; 950 951 if (conn->sess->sess_ops->RDMAExtensions) 952 return; 953 954 spin_lock_bh(&conn->cmd_lock); 955 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 956 spin_lock(&cmd->istate_lock); 957 if ((cmd->i_state == ISTATE_SENT_STATUS) && 958 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 959 cmd->i_state = ISTATE_REMOVE; 960 spin_unlock(&cmd->istate_lock); 961 list_move_tail(&cmd->i_conn_node, &ack_list); 962 continue; 963 } 964 spin_unlock(&cmd->istate_lock); 965 } 966 spin_unlock_bh(&conn->cmd_lock); 967 968 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 969 list_del_init(&cmd->i_conn_node); 970 iscsit_free_cmd(cmd, false); 971 } 972 } 973 974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 975 { 976 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 977 978 iov_count += ISCSI_IOV_DATA_BUFFER; 979 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 980 if (!cmd->iov_data) 981 return -ENOMEM; 982 983 cmd->orig_iov_data_count = iov_count; 984 return 0; 985 } 986 987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 988 unsigned char *buf) 989 { 990 int data_direction, payload_length; 991 struct iscsi_scsi_req *hdr; 992 int iscsi_task_attr; 993 int sam_task_attr; 994 995 atomic_long_inc(&conn->sess->cmd_pdus); 996 997 hdr = (struct iscsi_scsi_req *) buf; 998 payload_length = ntoh24(hdr->dlength); 999 1000 /* FIXME; Add checks for AdditionalHeaderSegment */ 1001 1002 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1003 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1004 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1005 " not set. Bad iSCSI Initiator.\n"); 1006 return iscsit_add_reject_cmd(cmd, 1007 ISCSI_REASON_BOOKMARK_INVALID, buf); 1008 } 1009 1010 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1011 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1012 /* 1013 * From RFC-3720 Section 10.3.1: 1014 * 1015 * "Either or both of R and W MAY be 1 when either the 1016 * Expected Data Transfer Length and/or Bidirectional Read 1017 * Expected Data Transfer Length are 0" 1018 * 1019 * For this case, go ahead and clear the unnecssary bits 1020 * to avoid any confusion with ->data_direction. 1021 */ 1022 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1023 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1024 1025 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1026 " set when Expected Data Transfer Length is 0 for" 1027 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1028 } 1029 1030 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1031 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1032 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1033 " MUST be set if Expected Data Transfer Length is not 0." 1034 " Bad iSCSI Initiator\n"); 1035 return iscsit_add_reject_cmd(cmd, 1036 ISCSI_REASON_BOOKMARK_INVALID, buf); 1037 } 1038 1039 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1040 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1041 pr_err("Bidirectional operations not supported!\n"); 1042 return iscsit_add_reject_cmd(cmd, 1043 ISCSI_REASON_BOOKMARK_INVALID, buf); 1044 } 1045 1046 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1047 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1048 " Scsi Command PDU.\n"); 1049 return iscsit_add_reject_cmd(cmd, 1050 ISCSI_REASON_BOOKMARK_INVALID, buf); 1051 } 1052 1053 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1054 pr_err("ImmediateData=No but DataSegmentLength=%u," 1055 " protocol error.\n", payload_length); 1056 return iscsit_add_reject_cmd(cmd, 1057 ISCSI_REASON_PROTOCOL_ERROR, buf); 1058 } 1059 1060 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1061 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1062 pr_err("Expected Data Transfer Length and Length of" 1063 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1064 " bit is not set protocol error\n"); 1065 return iscsit_add_reject_cmd(cmd, 1066 ISCSI_REASON_PROTOCOL_ERROR, buf); 1067 } 1068 1069 if (payload_length > be32_to_cpu(hdr->data_length)) { 1070 pr_err("DataSegmentLength: %u is greater than" 1071 " EDTL: %u, protocol error.\n", payload_length, 1072 hdr->data_length); 1073 return iscsit_add_reject_cmd(cmd, 1074 ISCSI_REASON_PROTOCOL_ERROR, buf); 1075 } 1076 1077 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1078 pr_err("DataSegmentLength: %u is greater than" 1079 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1080 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1081 return iscsit_add_reject_cmd(cmd, 1082 ISCSI_REASON_PROTOCOL_ERROR, buf); 1083 } 1084 1085 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1086 pr_err("DataSegmentLength: %u is greater than" 1087 " FirstBurstLength: %u, protocol error.\n", 1088 payload_length, conn->sess->sess_ops->FirstBurstLength); 1089 return iscsit_add_reject_cmd(cmd, 1090 ISCSI_REASON_BOOKMARK_INVALID, buf); 1091 } 1092 1093 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1094 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1095 DMA_NONE; 1096 1097 cmd->data_direction = data_direction; 1098 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1099 /* 1100 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1101 */ 1102 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1103 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1104 sam_task_attr = TCM_SIMPLE_TAG; 1105 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1106 sam_task_attr = TCM_ORDERED_TAG; 1107 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1108 sam_task_attr = TCM_HEAD_TAG; 1109 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1110 sam_task_attr = TCM_ACA_TAG; 1111 else { 1112 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1113 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1114 sam_task_attr = TCM_SIMPLE_TAG; 1115 } 1116 1117 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1118 cmd->i_state = ISTATE_NEW_CMD; 1119 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1120 cmd->immediate_data = (payload_length) ? 1 : 0; 1121 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1122 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1123 if (cmd->unsolicited_data) 1124 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1125 1126 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1127 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1128 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1129 else 1130 cmd->targ_xfer_tag = 0xFFFFFFFF; 1131 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1132 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1133 cmd->first_burst_len = payload_length; 1134 1135 if (!conn->sess->sess_ops->RDMAExtensions && 1136 cmd->data_direction == DMA_FROM_DEVICE) { 1137 struct iscsi_datain_req *dr; 1138 1139 dr = iscsit_allocate_datain_req(); 1140 if (!dr) 1141 return iscsit_add_reject_cmd(cmd, 1142 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1143 1144 iscsit_attach_datain_req(cmd, dr); 1145 } 1146 1147 /* 1148 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1149 */ 1150 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1151 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1152 cmd->data_direction, sam_task_attr, 1153 cmd->sense_buffer + 2); 1154 1155 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1156 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1157 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1158 conn->cid); 1159 1160 target_get_sess_cmd(&cmd->se_cmd, true); 1161 1162 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1163 scsilun_to_int(&hdr->lun)); 1164 if (cmd->sense_reason) 1165 goto attach_cmd; 1166 1167 /* only used for printks or comparing with ->ref_task_tag */ 1168 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1169 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1170 if (cmd->sense_reason) { 1171 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1172 return iscsit_add_reject_cmd(cmd, 1173 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1174 } 1175 1176 goto attach_cmd; 1177 } 1178 1179 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1180 return iscsit_add_reject_cmd(cmd, 1181 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1182 } 1183 1184 attach_cmd: 1185 spin_lock_bh(&conn->cmd_lock); 1186 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1187 spin_unlock_bh(&conn->cmd_lock); 1188 /* 1189 * Check if we need to delay processing because of ALUA 1190 * Active/NonOptimized primary access state.. 1191 */ 1192 core_alua_check_nonop_delay(&cmd->se_cmd); 1193 1194 return 0; 1195 } 1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1197 1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1199 { 1200 iscsit_set_dataout_sequence_values(cmd); 1201 1202 spin_lock_bh(&cmd->dataout_timeout_lock); 1203 iscsit_start_dataout_timer(cmd, cmd->conn); 1204 spin_unlock_bh(&cmd->dataout_timeout_lock); 1205 } 1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1207 1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1209 struct iscsi_scsi_req *hdr) 1210 { 1211 int cmdsn_ret = 0; 1212 /* 1213 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1214 * the Immediate Bit is not set, and no Immediate 1215 * Data is attached. 1216 * 1217 * A PDU/CmdSN carrying Immediate Data can only 1218 * be processed after the DataCRC has passed. 1219 * If the DataCRC fails, the CmdSN MUST NOT 1220 * be acknowledged. (See below) 1221 */ 1222 if (!cmd->immediate_data) { 1223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1224 (unsigned char *)hdr, hdr->cmdsn); 1225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1226 return -1; 1227 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1228 target_put_sess_cmd(&cmd->se_cmd); 1229 return 0; 1230 } 1231 } 1232 1233 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1234 1235 /* 1236 * If no Immediate Data is attached, it's OK to return now. 1237 */ 1238 if (!cmd->immediate_data) { 1239 if (!cmd->sense_reason && cmd->unsolicited_data) 1240 iscsit_set_unsoliticed_dataout(cmd); 1241 if (!cmd->sense_reason) 1242 return 0; 1243 1244 target_put_sess_cmd(&cmd->se_cmd); 1245 return 0; 1246 } 1247 1248 /* 1249 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1250 * execution. These exceptions are processed in CmdSN order using 1251 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1252 */ 1253 if (cmd->sense_reason) 1254 return 1; 1255 /* 1256 * Call directly into transport_generic_new_cmd() to perform 1257 * the backend memory allocation. 1258 */ 1259 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1260 if (cmd->sense_reason) 1261 return 1; 1262 1263 return 0; 1264 } 1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1266 1267 static int 1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1269 bool dump_payload) 1270 { 1271 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1272 /* 1273 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1274 */ 1275 if (dump_payload) 1276 goto after_immediate_data; 1277 /* 1278 * Check for underflow case where both EDTL and immediate data payload 1279 * exceeds what is presented by CDB's TRANSFER LENGTH, and what has 1280 * already been set in target_cmd_size_check() as se_cmd->data_length. 1281 * 1282 * For this special case, fail the command and dump the immediate data 1283 * payload. 1284 */ 1285 if (cmd->first_burst_len > cmd->se_cmd.data_length) { 1286 cmd->sense_reason = TCM_INVALID_CDB_FIELD; 1287 goto after_immediate_data; 1288 } 1289 1290 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1291 cmd->first_burst_len); 1292 after_immediate_data: 1293 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1294 /* 1295 * A PDU/CmdSN carrying Immediate Data passed 1296 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1297 * Immediate Bit is not set. 1298 */ 1299 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1300 (unsigned char *)hdr, hdr->cmdsn); 1301 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1302 return -1; 1303 1304 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1305 int rc; 1306 1307 rc = iscsit_dump_data_payload(cmd->conn, 1308 cmd->first_burst_len, 1); 1309 target_put_sess_cmd(&cmd->se_cmd); 1310 return rc; 1311 } else if (cmd->unsolicited_data) 1312 iscsit_set_unsoliticed_dataout(cmd); 1313 1314 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1315 /* 1316 * Immediate Data failed DataCRC and ERL>=1, 1317 * silently drop this PDU and let the initiator 1318 * plug the CmdSN gap. 1319 * 1320 * FIXME: Send Unsolicited NOPIN with reserved 1321 * TTT here to help the initiator figure out 1322 * the missing CmdSN, although they should be 1323 * intelligent enough to determine the missing 1324 * CmdSN and issue a retry to plug the sequence. 1325 */ 1326 cmd->i_state = ISTATE_REMOVE; 1327 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1328 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1329 return -1; 1330 1331 return 0; 1332 } 1333 1334 static int 1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1336 unsigned char *buf) 1337 { 1338 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1339 int rc, immed_data; 1340 bool dump_payload = false; 1341 1342 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1343 if (rc < 0) 1344 return 0; 1345 /* 1346 * Allocation iovecs needed for struct socket operations for 1347 * traditional iSCSI block I/O. 1348 */ 1349 if (iscsit_allocate_iovecs(cmd) < 0) { 1350 return iscsit_reject_cmd(cmd, 1351 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1352 } 1353 immed_data = cmd->immediate_data; 1354 1355 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1356 if (rc < 0) 1357 return rc; 1358 else if (rc > 0) 1359 dump_payload = true; 1360 1361 if (!immed_data) 1362 return 0; 1363 1364 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1365 } 1366 1367 static u32 iscsit_do_crypto_hash_sg( 1368 struct ahash_request *hash, 1369 struct iscsi_cmd *cmd, 1370 u32 data_offset, 1371 u32 data_length, 1372 u32 padding, 1373 u8 *pad_bytes) 1374 { 1375 u32 data_crc; 1376 struct scatterlist *sg; 1377 unsigned int page_off; 1378 1379 crypto_ahash_init(hash); 1380 1381 sg = cmd->first_data_sg; 1382 page_off = cmd->first_data_sg_off; 1383 1384 while (data_length) { 1385 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1386 1387 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1388 crypto_ahash_update(hash); 1389 1390 data_length -= cur_len; 1391 page_off = 0; 1392 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1393 sg = sg_next(sg); 1394 } 1395 1396 if (padding) { 1397 struct scatterlist pad_sg; 1398 1399 sg_init_one(&pad_sg, pad_bytes, padding); 1400 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1401 padding); 1402 crypto_ahash_finup(hash); 1403 } else { 1404 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1405 crypto_ahash_final(hash); 1406 } 1407 1408 return data_crc; 1409 } 1410 1411 static void iscsit_do_crypto_hash_buf( 1412 struct ahash_request *hash, 1413 const void *buf, 1414 u32 payload_length, 1415 u32 padding, 1416 u8 *pad_bytes, 1417 u8 *data_crc) 1418 { 1419 struct scatterlist sg[2]; 1420 1421 sg_init_table(sg, ARRAY_SIZE(sg)); 1422 sg_set_buf(sg, buf, payload_length); 1423 sg_set_buf(sg + 1, pad_bytes, padding); 1424 1425 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1426 1427 crypto_ahash_digest(hash); 1428 } 1429 1430 int 1431 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1432 struct iscsi_cmd *cmd, u32 payload_length, 1433 bool *success) 1434 { 1435 struct iscsi_data *hdr = buf; 1436 struct se_cmd *se_cmd; 1437 int rc; 1438 1439 /* iSCSI write */ 1440 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1441 1442 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1443 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1444 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1445 payload_length, conn->cid); 1446 1447 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1448 pr_err("Command ITT: 0x%08x received DataOUT after" 1449 " last DataOUT received, dumping payload\n", 1450 cmd->init_task_tag); 1451 return iscsit_dump_data_payload(conn, payload_length, 1); 1452 } 1453 1454 if (cmd->data_direction != DMA_TO_DEVICE) { 1455 pr_err("Command ITT: 0x%08x received DataOUT for a" 1456 " NON-WRITE command.\n", cmd->init_task_tag); 1457 return iscsit_dump_data_payload(conn, payload_length, 1); 1458 } 1459 se_cmd = &cmd->se_cmd; 1460 iscsit_mod_dataout_timer(cmd); 1461 1462 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1463 pr_err("DataOut Offset: %u, Length %u greater than" 1464 " iSCSI Command EDTL %u, protocol error.\n", 1465 hdr->offset, payload_length, cmd->se_cmd.data_length); 1466 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1467 } 1468 1469 if (cmd->unsolicited_data) { 1470 int dump_unsolicited_data = 0; 1471 1472 if (conn->sess->sess_ops->InitialR2T) { 1473 pr_err("Received unexpected unsolicited data" 1474 " while InitialR2T=Yes, protocol error.\n"); 1475 transport_send_check_condition_and_sense(&cmd->se_cmd, 1476 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1477 return -1; 1478 } 1479 /* 1480 * Special case for dealing with Unsolicited DataOUT 1481 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1482 * failures; 1483 */ 1484 1485 /* Something's amiss if we're not in WRITE_PENDING state... */ 1486 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1487 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1488 dump_unsolicited_data = 1; 1489 1490 if (dump_unsolicited_data) { 1491 /* 1492 * Check if a delayed TASK_ABORTED status needs to 1493 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1494 * received with the unsolicited data out. 1495 */ 1496 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1497 iscsit_stop_dataout_timer(cmd); 1498 1499 transport_check_aborted_status(se_cmd, 1500 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1501 return iscsit_dump_data_payload(conn, payload_length, 1); 1502 } 1503 } else { 1504 /* 1505 * For the normal solicited data path: 1506 * 1507 * Check for a delayed TASK_ABORTED status and dump any 1508 * incoming data out payload if one exists. Also, when the 1509 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1510 * data out sequence, we decrement outstanding_r2ts. Once 1511 * outstanding_r2ts reaches zero, go ahead and send the delayed 1512 * TASK_ABORTED status. 1513 */ 1514 if (se_cmd->transport_state & CMD_T_ABORTED) { 1515 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1516 if (--cmd->outstanding_r2ts < 1) { 1517 iscsit_stop_dataout_timer(cmd); 1518 transport_check_aborted_status( 1519 se_cmd, 1); 1520 } 1521 1522 return iscsit_dump_data_payload(conn, payload_length, 1); 1523 } 1524 } 1525 /* 1526 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1527 * within-command recovery checks before receiving the payload. 1528 */ 1529 rc = iscsit_check_pre_dataout(cmd, buf); 1530 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1531 return 0; 1532 else if (rc == DATAOUT_CANNOT_RECOVER) 1533 return -1; 1534 *success = true; 1535 return 0; 1536 } 1537 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1538 1539 int 1540 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1541 struct iscsi_cmd **out_cmd) 1542 { 1543 struct iscsi_data *hdr = buf; 1544 struct iscsi_cmd *cmd; 1545 u32 payload_length = ntoh24(hdr->dlength); 1546 int rc; 1547 bool success = false; 1548 1549 if (!payload_length) { 1550 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1551 return 0; 1552 } 1553 1554 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1555 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1556 " MaxXmitDataSegmentLength: %u\n", payload_length, 1557 conn->conn_ops->MaxXmitDataSegmentLength); 1558 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1559 } 1560 1561 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1562 if (!cmd) 1563 return 0; 1564 1565 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1566 1567 if (success) 1568 *out_cmd = cmd; 1569 1570 return rc; 1571 } 1572 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1573 1574 static int 1575 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1576 struct iscsi_data *hdr) 1577 { 1578 struct kvec *iov; 1579 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1580 u32 payload_length = ntoh24(hdr->dlength); 1581 int iov_ret, data_crc_failed = 0; 1582 1583 rx_size += payload_length; 1584 iov = &cmd->iov_data[0]; 1585 1586 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1587 payload_length); 1588 if (iov_ret < 0) 1589 return -1; 1590 1591 iov_count += iov_ret; 1592 1593 padding = ((-payload_length) & 3); 1594 if (padding != 0) { 1595 iov[iov_count].iov_base = cmd->pad_bytes; 1596 iov[iov_count++].iov_len = padding; 1597 rx_size += padding; 1598 pr_debug("Receiving %u padding bytes.\n", padding); 1599 } 1600 1601 if (conn->conn_ops->DataDigest) { 1602 iov[iov_count].iov_base = &checksum; 1603 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1604 rx_size += ISCSI_CRC_LEN; 1605 } 1606 1607 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1608 1609 iscsit_unmap_iovec(cmd); 1610 1611 if (rx_got != rx_size) 1612 return -1; 1613 1614 if (conn->conn_ops->DataDigest) { 1615 u32 data_crc; 1616 1617 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1618 be32_to_cpu(hdr->offset), 1619 payload_length, padding, 1620 cmd->pad_bytes); 1621 1622 if (checksum != data_crc) { 1623 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1624 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1625 " does not match computed 0x%08x\n", 1626 hdr->itt, hdr->offset, payload_length, 1627 hdr->datasn, checksum, data_crc); 1628 data_crc_failed = 1; 1629 } else { 1630 pr_debug("Got CRC32C DataDigest 0x%08x for" 1631 " %u bytes of Data Out\n", checksum, 1632 payload_length); 1633 } 1634 } 1635 1636 return data_crc_failed; 1637 } 1638 1639 int 1640 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1641 bool data_crc_failed) 1642 { 1643 struct iscsi_conn *conn = cmd->conn; 1644 int rc, ooo_cmdsn; 1645 /* 1646 * Increment post receive data and CRC values or perform 1647 * within-command recovery. 1648 */ 1649 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1650 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1651 return 0; 1652 else if (rc == DATAOUT_SEND_R2T) { 1653 iscsit_set_dataout_sequence_values(cmd); 1654 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1655 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1656 /* 1657 * Handle extra special case for out of order 1658 * Unsolicited Data Out. 1659 */ 1660 spin_lock_bh(&cmd->istate_lock); 1661 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1664 spin_unlock_bh(&cmd->istate_lock); 1665 1666 iscsit_stop_dataout_timer(cmd); 1667 if (ooo_cmdsn) 1668 return 0; 1669 target_execute_cmd(&cmd->se_cmd); 1670 return 0; 1671 } else /* DATAOUT_CANNOT_RECOVER */ 1672 return -1; 1673 1674 return 0; 1675 } 1676 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1677 1678 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1679 { 1680 struct iscsi_cmd *cmd = NULL; 1681 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1682 int rc; 1683 bool data_crc_failed = false; 1684 1685 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1686 if (rc < 0) 1687 return 0; 1688 else if (!cmd) 1689 return 0; 1690 1691 rc = iscsit_get_dataout(conn, cmd, hdr); 1692 if (rc < 0) 1693 return rc; 1694 else if (rc > 0) 1695 data_crc_failed = true; 1696 1697 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1698 } 1699 1700 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1701 struct iscsi_nopout *hdr) 1702 { 1703 u32 payload_length = ntoh24(hdr->dlength); 1704 1705 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1706 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1707 if (!cmd) 1708 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1709 (unsigned char *)hdr); 1710 1711 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1712 (unsigned char *)hdr); 1713 } 1714 1715 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1716 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1717 " not set, protocol error.\n"); 1718 if (!cmd) 1719 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1720 (unsigned char *)hdr); 1721 1722 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1723 (unsigned char *)hdr); 1724 } 1725 1726 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1727 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1728 " greater than MaxXmitDataSegmentLength: %u, protocol" 1729 " error.\n", payload_length, 1730 conn->conn_ops->MaxXmitDataSegmentLength); 1731 if (!cmd) 1732 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1733 (unsigned char *)hdr); 1734 1735 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1736 (unsigned char *)hdr); 1737 } 1738 1739 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1740 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1741 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1742 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1743 payload_length); 1744 /* 1745 * This is not a response to a Unsolicited NopIN, which means 1746 * it can either be a NOPOUT ping request (with a valid ITT), 1747 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1748 * Either way, make sure we allocate an struct iscsi_cmd, as both 1749 * can contain ping data. 1750 */ 1751 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1752 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1753 cmd->i_state = ISTATE_SEND_NOPIN; 1754 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1755 1 : 0); 1756 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1757 cmd->targ_xfer_tag = 0xFFFFFFFF; 1758 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1759 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1760 cmd->data_direction = DMA_NONE; 1761 } 1762 1763 return 0; 1764 } 1765 EXPORT_SYMBOL(iscsit_setup_nop_out); 1766 1767 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1768 struct iscsi_nopout *hdr) 1769 { 1770 struct iscsi_cmd *cmd_p = NULL; 1771 int cmdsn_ret = 0; 1772 /* 1773 * Initiator is expecting a NopIN ping reply.. 1774 */ 1775 if (hdr->itt != RESERVED_ITT) { 1776 if (!cmd) 1777 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1778 (unsigned char *)hdr); 1779 1780 spin_lock_bh(&conn->cmd_lock); 1781 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1782 spin_unlock_bh(&conn->cmd_lock); 1783 1784 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1785 1786 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1787 iscsit_add_cmd_to_response_queue(cmd, conn, 1788 cmd->i_state); 1789 return 0; 1790 } 1791 1792 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1793 (unsigned char *)hdr, hdr->cmdsn); 1794 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1795 return 0; 1796 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1797 return -1; 1798 1799 return 0; 1800 } 1801 /* 1802 * This was a response to a unsolicited NOPIN ping. 1803 */ 1804 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1805 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1806 if (!cmd_p) 1807 return -EINVAL; 1808 1809 iscsit_stop_nopin_response_timer(conn); 1810 1811 cmd_p->i_state = ISTATE_REMOVE; 1812 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1813 1814 iscsit_start_nopin_timer(conn); 1815 return 0; 1816 } 1817 /* 1818 * Otherwise, initiator is not expecting a NOPIN is response. 1819 * Just ignore for now. 1820 */ 1821 1822 if (cmd) 1823 iscsit_free_cmd(cmd, false); 1824 1825 return 0; 1826 } 1827 EXPORT_SYMBOL(iscsit_process_nop_out); 1828 1829 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1830 unsigned char *buf) 1831 { 1832 unsigned char *ping_data = NULL; 1833 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1834 struct kvec *iov = NULL; 1835 u32 payload_length = ntoh24(hdr->dlength); 1836 int ret; 1837 1838 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1839 if (ret < 0) 1840 return 0; 1841 /* 1842 * Handle NOP-OUT payload for traditional iSCSI sockets 1843 */ 1844 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1845 u32 checksum, data_crc, padding = 0; 1846 int niov = 0, rx_got, rx_size = payload_length; 1847 1848 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1849 if (!ping_data) { 1850 ret = -1; 1851 goto out; 1852 } 1853 1854 iov = &cmd->iov_misc[0]; 1855 iov[niov].iov_base = ping_data; 1856 iov[niov++].iov_len = payload_length; 1857 1858 padding = ((-payload_length) & 3); 1859 if (padding != 0) { 1860 pr_debug("Receiving %u additional bytes" 1861 " for padding.\n", padding); 1862 iov[niov].iov_base = &cmd->pad_bytes; 1863 iov[niov++].iov_len = padding; 1864 rx_size += padding; 1865 } 1866 if (conn->conn_ops->DataDigest) { 1867 iov[niov].iov_base = &checksum; 1868 iov[niov++].iov_len = ISCSI_CRC_LEN; 1869 rx_size += ISCSI_CRC_LEN; 1870 } 1871 1872 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1873 if (rx_got != rx_size) { 1874 ret = -1; 1875 goto out; 1876 } 1877 1878 if (conn->conn_ops->DataDigest) { 1879 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 1880 ping_data, payload_length, 1881 padding, cmd->pad_bytes, 1882 (u8 *)&data_crc); 1883 1884 if (checksum != data_crc) { 1885 pr_err("Ping data CRC32C DataDigest" 1886 " 0x%08x does not match computed 0x%08x\n", 1887 checksum, data_crc); 1888 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1889 pr_err("Unable to recover from" 1890 " NOPOUT Ping DataCRC failure while in" 1891 " ERL=0.\n"); 1892 ret = -1; 1893 goto out; 1894 } else { 1895 /* 1896 * Silently drop this PDU and let the 1897 * initiator plug the CmdSN gap. 1898 */ 1899 pr_debug("Dropping NOPOUT" 1900 " Command CmdSN: 0x%08x due to" 1901 " DataCRC error.\n", hdr->cmdsn); 1902 ret = 0; 1903 goto out; 1904 } 1905 } else { 1906 pr_debug("Got CRC32C DataDigest" 1907 " 0x%08x for %u bytes of ping data.\n", 1908 checksum, payload_length); 1909 } 1910 } 1911 1912 ping_data[payload_length] = '\0'; 1913 /* 1914 * Attach ping data to struct iscsi_cmd->buf_ptr. 1915 */ 1916 cmd->buf_ptr = ping_data; 1917 cmd->buf_ptr_size = payload_length; 1918 1919 pr_debug("Got %u bytes of NOPOUT ping" 1920 " data.\n", payload_length); 1921 pr_debug("Ping Data: \"%s\"\n", ping_data); 1922 } 1923 1924 return iscsit_process_nop_out(conn, cmd, hdr); 1925 out: 1926 if (cmd) 1927 iscsit_free_cmd(cmd, false); 1928 1929 kfree(ping_data); 1930 return ret; 1931 } 1932 1933 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1934 { 1935 switch (iscsi_tmf) { 1936 case ISCSI_TM_FUNC_ABORT_TASK: 1937 return TMR_ABORT_TASK; 1938 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1939 return TMR_ABORT_TASK_SET; 1940 case ISCSI_TM_FUNC_CLEAR_ACA: 1941 return TMR_CLEAR_ACA; 1942 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1943 return TMR_CLEAR_TASK_SET; 1944 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1945 return TMR_LUN_RESET; 1946 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1947 return TMR_TARGET_WARM_RESET; 1948 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1949 return TMR_TARGET_COLD_RESET; 1950 default: 1951 return TMR_UNKNOWN; 1952 } 1953 } 1954 1955 int 1956 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1957 unsigned char *buf) 1958 { 1959 struct se_tmr_req *se_tmr; 1960 struct iscsi_tmr_req *tmr_req; 1961 struct iscsi_tm *hdr; 1962 int out_of_order_cmdsn = 0, ret; 1963 bool sess_ref = false; 1964 u8 function, tcm_function = TMR_UNKNOWN; 1965 1966 hdr = (struct iscsi_tm *) buf; 1967 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1968 function = hdr->flags; 1969 1970 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1971 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1972 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1973 hdr->rtt, hdr->refcmdsn, conn->cid); 1974 1975 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1976 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1977 hdr->rtt != RESERVED_ITT)) { 1978 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1979 hdr->rtt = RESERVED_ITT; 1980 } 1981 1982 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1983 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1984 pr_err("Task Management Request TASK_REASSIGN not" 1985 " issued as immediate command, bad iSCSI Initiator" 1986 "implementation\n"); 1987 return iscsit_add_reject_cmd(cmd, 1988 ISCSI_REASON_PROTOCOL_ERROR, buf); 1989 } 1990 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1991 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1992 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1993 1994 cmd->data_direction = DMA_NONE; 1995 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 1996 if (!cmd->tmr_req) 1997 return iscsit_add_reject_cmd(cmd, 1998 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1999 buf); 2000 2001 /* 2002 * TASK_REASSIGN for ERL=2 / connection stays inside of 2003 * LIO-Target $FABRIC_MOD 2004 */ 2005 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2006 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 2007 conn->sess->se_sess, 0, DMA_NONE, 2008 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2009 2010 target_get_sess_cmd(&cmd->se_cmd, true); 2011 sess_ref = true; 2012 tcm_function = iscsit_convert_tmf(function); 2013 if (tcm_function == TMR_UNKNOWN) { 2014 pr_err("Unknown iSCSI TMR Function:" 2015 " 0x%02x\n", function); 2016 return iscsit_add_reject_cmd(cmd, 2017 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2018 } 2019 } 2020 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2021 GFP_KERNEL); 2022 if (ret < 0) 2023 return iscsit_add_reject_cmd(cmd, 2024 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2025 2026 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2027 2028 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2029 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2030 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2031 cmd->init_task_tag = hdr->itt; 2032 cmd->targ_xfer_tag = 0xFFFFFFFF; 2033 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2034 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2035 se_tmr = cmd->se_cmd.se_tmr_req; 2036 tmr_req = cmd->tmr_req; 2037 /* 2038 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2039 */ 2040 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2041 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2042 scsilun_to_int(&hdr->lun)); 2043 if (ret < 0) { 2044 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2045 goto attach; 2046 } 2047 } 2048 2049 switch (function) { 2050 case ISCSI_TM_FUNC_ABORT_TASK: 2051 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2052 if (se_tmr->response) 2053 goto attach; 2054 break; 2055 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2056 case ISCSI_TM_FUNC_CLEAR_ACA: 2057 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2058 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2059 break; 2060 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2061 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2062 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2063 goto attach; 2064 } 2065 break; 2066 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2067 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2068 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2069 goto attach; 2070 } 2071 break; 2072 case ISCSI_TM_FUNC_TASK_REASSIGN: 2073 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2074 /* 2075 * Perform sanity checks on the ExpDataSN only if the 2076 * TASK_REASSIGN was successful. 2077 */ 2078 if (se_tmr->response) 2079 break; 2080 2081 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2082 return iscsit_add_reject_cmd(cmd, 2083 ISCSI_REASON_BOOKMARK_INVALID, buf); 2084 break; 2085 default: 2086 pr_err("Unknown TMR function: 0x%02x, protocol" 2087 " error.\n", function); 2088 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2089 goto attach; 2090 } 2091 2092 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2093 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2094 se_tmr->call_transport = 1; 2095 attach: 2096 spin_lock_bh(&conn->cmd_lock); 2097 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2098 spin_unlock_bh(&conn->cmd_lock); 2099 2100 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2101 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2102 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 2103 out_of_order_cmdsn = 1; 2104 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2105 return 0; 2106 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2107 return -1; 2108 } 2109 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2110 2111 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2112 return 0; 2113 /* 2114 * Found the referenced task, send to transport for processing. 2115 */ 2116 if (se_tmr->call_transport) 2117 return transport_generic_handle_tmr(&cmd->se_cmd); 2118 2119 /* 2120 * Could not find the referenced LUN, task, or Task Management 2121 * command not authorized or supported. Change state and 2122 * let the tx_thread send the response. 2123 * 2124 * For connection recovery, this is also the default action for 2125 * TMR TASK_REASSIGN. 2126 */ 2127 if (sess_ref) { 2128 pr_debug("Handle TMR, using sess_ref=true check\n"); 2129 target_put_sess_cmd(&cmd->se_cmd); 2130 } 2131 2132 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2133 return 0; 2134 } 2135 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2136 2137 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2138 int 2139 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2140 struct iscsi_text *hdr) 2141 { 2142 u32 payload_length = ntoh24(hdr->dlength); 2143 2144 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2145 pr_err("Unable to accept text parameter length: %u" 2146 "greater than MaxXmitDataSegmentLength %u.\n", 2147 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2149 (unsigned char *)hdr); 2150 } 2151 2152 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2153 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2154 pr_err("Multi sequence text commands currently not supported\n"); 2155 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2156 (unsigned char *)hdr); 2157 } 2158 2159 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2160 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2161 hdr->exp_statsn, payload_length); 2162 2163 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2164 cmd->i_state = ISTATE_SEND_TEXTRSP; 2165 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2166 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2167 cmd->targ_xfer_tag = 0xFFFFFFFF; 2168 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2169 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2170 cmd->data_direction = DMA_NONE; 2171 kfree(cmd->text_in_ptr); 2172 cmd->text_in_ptr = NULL; 2173 2174 return 0; 2175 } 2176 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2177 2178 int 2179 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2180 struct iscsi_text *hdr) 2181 { 2182 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2183 int cmdsn_ret; 2184 2185 if (!text_in) { 2186 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2187 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2188 pr_err("Unable to locate text_in buffer for sendtargets" 2189 " discovery\n"); 2190 goto reject; 2191 } 2192 goto empty_sendtargets; 2193 } 2194 if (strncmp("SendTargets", text_in, 11) != 0) { 2195 pr_err("Received Text Data that is not" 2196 " SendTargets, cannot continue.\n"); 2197 goto reject; 2198 } 2199 text_ptr = strchr(text_in, '='); 2200 if (!text_ptr) { 2201 pr_err("No \"=\" separator found in Text Data," 2202 " cannot continue.\n"); 2203 goto reject; 2204 } 2205 if (!strncmp("=All", text_ptr, 4)) { 2206 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2207 } else if (!strncmp("=iqn.", text_ptr, 5) || 2208 !strncmp("=eui.", text_ptr, 5)) { 2209 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2210 } else { 2211 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2212 goto reject; 2213 } 2214 2215 spin_lock_bh(&conn->cmd_lock); 2216 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2217 spin_unlock_bh(&conn->cmd_lock); 2218 2219 empty_sendtargets: 2220 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2221 2222 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2223 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2224 (unsigned char *)hdr, hdr->cmdsn); 2225 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2226 return -1; 2227 2228 return 0; 2229 } 2230 2231 return iscsit_execute_cmd(cmd, 0); 2232 2233 reject: 2234 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2235 (unsigned char *)hdr); 2236 } 2237 EXPORT_SYMBOL(iscsit_process_text_cmd); 2238 2239 static int 2240 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2241 unsigned char *buf) 2242 { 2243 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2244 char *text_in = NULL; 2245 u32 payload_length = ntoh24(hdr->dlength); 2246 int rx_size, rc; 2247 2248 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2249 if (rc < 0) 2250 return 0; 2251 2252 rx_size = payload_length; 2253 if (payload_length) { 2254 u32 checksum = 0, data_crc = 0; 2255 u32 padding = 0, pad_bytes = 0; 2256 int niov = 0, rx_got; 2257 struct kvec iov[3]; 2258 2259 text_in = kzalloc(payload_length, GFP_KERNEL); 2260 if (!text_in) 2261 goto reject; 2262 2263 cmd->text_in_ptr = text_in; 2264 2265 memset(iov, 0, 3 * sizeof(struct kvec)); 2266 iov[niov].iov_base = text_in; 2267 iov[niov++].iov_len = payload_length; 2268 2269 padding = ((-payload_length) & 3); 2270 if (padding != 0) { 2271 iov[niov].iov_base = &pad_bytes; 2272 iov[niov++].iov_len = padding; 2273 rx_size += padding; 2274 pr_debug("Receiving %u additional bytes" 2275 " for padding.\n", padding); 2276 } 2277 if (conn->conn_ops->DataDigest) { 2278 iov[niov].iov_base = &checksum; 2279 iov[niov++].iov_len = ISCSI_CRC_LEN; 2280 rx_size += ISCSI_CRC_LEN; 2281 } 2282 2283 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2284 if (rx_got != rx_size) 2285 goto reject; 2286 2287 if (conn->conn_ops->DataDigest) { 2288 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2289 text_in, payload_length, 2290 padding, (u8 *)&pad_bytes, 2291 (u8 *)&data_crc); 2292 2293 if (checksum != data_crc) { 2294 pr_err("Text data CRC32C DataDigest" 2295 " 0x%08x does not match computed" 2296 " 0x%08x\n", checksum, data_crc); 2297 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2298 pr_err("Unable to recover from" 2299 " Text Data digest failure while in" 2300 " ERL=0.\n"); 2301 goto reject; 2302 } else { 2303 /* 2304 * Silently drop this PDU and let the 2305 * initiator plug the CmdSN gap. 2306 */ 2307 pr_debug("Dropping Text" 2308 " Command CmdSN: 0x%08x due to" 2309 " DataCRC error.\n", hdr->cmdsn); 2310 kfree(text_in); 2311 return 0; 2312 } 2313 } else { 2314 pr_debug("Got CRC32C DataDigest" 2315 " 0x%08x for %u bytes of text data.\n", 2316 checksum, payload_length); 2317 } 2318 } 2319 text_in[payload_length - 1] = '\0'; 2320 pr_debug("Successfully read %d bytes of text" 2321 " data.\n", payload_length); 2322 } 2323 2324 return iscsit_process_text_cmd(conn, cmd, hdr); 2325 2326 reject: 2327 kfree(cmd->text_in_ptr); 2328 cmd->text_in_ptr = NULL; 2329 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2330 } 2331 2332 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2333 { 2334 struct iscsi_conn *conn_p; 2335 struct iscsi_session *sess = conn->sess; 2336 2337 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2338 " for SID: %u.\n", conn->cid, conn->sess->sid); 2339 2340 atomic_set(&sess->session_logout, 1); 2341 atomic_set(&conn->conn_logout_remove, 1); 2342 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2343 2344 iscsit_inc_conn_usage_count(conn); 2345 iscsit_inc_session_usage_count(sess); 2346 2347 spin_lock_bh(&sess->conn_lock); 2348 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2349 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2350 continue; 2351 2352 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2353 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2354 } 2355 spin_unlock_bh(&sess->conn_lock); 2356 2357 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2358 2359 return 0; 2360 } 2361 2362 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2363 { 2364 struct iscsi_conn *l_conn; 2365 struct iscsi_session *sess = conn->sess; 2366 2367 pr_debug("Received logout request CLOSECONNECTION for CID:" 2368 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2369 2370 /* 2371 * A Logout Request with a CLOSECONNECTION reason code for a CID 2372 * can arrive on a connection with a differing CID. 2373 */ 2374 if (conn->cid == cmd->logout_cid) { 2375 spin_lock_bh(&conn->state_lock); 2376 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2377 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2378 2379 atomic_set(&conn->conn_logout_remove, 1); 2380 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2381 iscsit_inc_conn_usage_count(conn); 2382 2383 spin_unlock_bh(&conn->state_lock); 2384 } else { 2385 /* 2386 * Handle all different cid CLOSECONNECTION requests in 2387 * iscsit_logout_post_handler_diffcid() as to give enough 2388 * time for any non immediate command's CmdSN to be 2389 * acknowledged on the connection in question. 2390 * 2391 * Here we simply make sure the CID is still around. 2392 */ 2393 l_conn = iscsit_get_conn_from_cid(sess, 2394 cmd->logout_cid); 2395 if (!l_conn) { 2396 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2397 iscsit_add_cmd_to_response_queue(cmd, conn, 2398 cmd->i_state); 2399 return 0; 2400 } 2401 2402 iscsit_dec_conn_usage_count(l_conn); 2403 } 2404 2405 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2406 2407 return 0; 2408 } 2409 2410 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2411 { 2412 struct iscsi_session *sess = conn->sess; 2413 2414 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2415 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2416 2417 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2418 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2419 " while ERL!=2.\n"); 2420 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2421 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2422 return 0; 2423 } 2424 2425 if (conn->cid == cmd->logout_cid) { 2426 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2427 " with CID: %hu on CID: %hu, implementation error.\n", 2428 cmd->logout_cid, conn->cid); 2429 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2430 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2431 return 0; 2432 } 2433 2434 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2435 2436 return 0; 2437 } 2438 2439 int 2440 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2441 unsigned char *buf) 2442 { 2443 int cmdsn_ret, logout_remove = 0; 2444 u8 reason_code = 0; 2445 struct iscsi_logout *hdr; 2446 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2447 2448 hdr = (struct iscsi_logout *) buf; 2449 reason_code = (hdr->flags & 0x7f); 2450 2451 if (tiqn) { 2452 spin_lock(&tiqn->logout_stats.lock); 2453 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2454 tiqn->logout_stats.normal_logouts++; 2455 else 2456 tiqn->logout_stats.abnormal_logouts++; 2457 spin_unlock(&tiqn->logout_stats.lock); 2458 } 2459 2460 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2461 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2462 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2463 hdr->cid, conn->cid); 2464 2465 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2466 pr_err("Received logout request on connection that" 2467 " is not in logged in state, ignoring request.\n"); 2468 iscsit_free_cmd(cmd, false); 2469 return 0; 2470 } 2471 2472 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2473 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2474 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2475 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2476 cmd->targ_xfer_tag = 0xFFFFFFFF; 2477 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2478 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2479 cmd->logout_cid = be16_to_cpu(hdr->cid); 2480 cmd->logout_reason = reason_code; 2481 cmd->data_direction = DMA_NONE; 2482 2483 /* 2484 * We need to sleep in these cases (by returning 1) until the Logout 2485 * Response gets sent in the tx thread. 2486 */ 2487 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2488 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2489 be16_to_cpu(hdr->cid) == conn->cid)) 2490 logout_remove = 1; 2491 2492 spin_lock_bh(&conn->cmd_lock); 2493 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2494 spin_unlock_bh(&conn->cmd_lock); 2495 2496 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2497 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2498 2499 /* 2500 * Immediate commands are executed, well, immediately. 2501 * Non-Immediate Logout Commands are executed in CmdSN order. 2502 */ 2503 if (cmd->immediate_cmd) { 2504 int ret = iscsit_execute_cmd(cmd, 0); 2505 2506 if (ret < 0) 2507 return ret; 2508 } else { 2509 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2510 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2511 logout_remove = 0; 2512 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2513 return -1; 2514 } 2515 2516 return logout_remove; 2517 } 2518 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2519 2520 int iscsit_handle_snack( 2521 struct iscsi_conn *conn, 2522 unsigned char *buf) 2523 { 2524 struct iscsi_snack *hdr; 2525 2526 hdr = (struct iscsi_snack *) buf; 2527 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2528 2529 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2530 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2531 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2532 hdr->begrun, hdr->runlength, conn->cid); 2533 2534 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2535 pr_err("Initiator sent SNACK request while in" 2536 " ErrorRecoveryLevel=0.\n"); 2537 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2538 buf); 2539 } 2540 /* 2541 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2542 * call from inside iscsi_send_recovery_datain_or_r2t(). 2543 */ 2544 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2545 case 0: 2546 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2547 hdr->itt, 2548 be32_to_cpu(hdr->ttt), 2549 be32_to_cpu(hdr->begrun), 2550 be32_to_cpu(hdr->runlength)); 2551 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2552 return iscsit_handle_status_snack(conn, hdr->itt, 2553 be32_to_cpu(hdr->ttt), 2554 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2555 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2556 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2557 be32_to_cpu(hdr->begrun), 2558 be32_to_cpu(hdr->runlength)); 2559 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2560 /* FIXME: Support R-Data SNACK */ 2561 pr_err("R-Data SNACK Not Supported.\n"); 2562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2563 buf); 2564 default: 2565 pr_err("Unknown SNACK type 0x%02x, protocol" 2566 " error.\n", hdr->flags & 0x0f); 2567 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2568 buf); 2569 } 2570 2571 return 0; 2572 } 2573 EXPORT_SYMBOL(iscsit_handle_snack); 2574 2575 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2576 { 2577 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2578 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2579 wait_for_completion_interruptible_timeout( 2580 &conn->rx_half_close_comp, 2581 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2582 } 2583 } 2584 2585 static int iscsit_handle_immediate_data( 2586 struct iscsi_cmd *cmd, 2587 struct iscsi_scsi_req *hdr, 2588 u32 length) 2589 { 2590 int iov_ret, rx_got = 0, rx_size = 0; 2591 u32 checksum, iov_count = 0, padding = 0; 2592 struct iscsi_conn *conn = cmd->conn; 2593 struct kvec *iov; 2594 2595 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2596 if (iov_ret < 0) 2597 return IMMEDIATE_DATA_CANNOT_RECOVER; 2598 2599 rx_size = length; 2600 iov_count = iov_ret; 2601 iov = &cmd->iov_data[0]; 2602 2603 padding = ((-length) & 3); 2604 if (padding != 0) { 2605 iov[iov_count].iov_base = cmd->pad_bytes; 2606 iov[iov_count++].iov_len = padding; 2607 rx_size += padding; 2608 } 2609 2610 if (conn->conn_ops->DataDigest) { 2611 iov[iov_count].iov_base = &checksum; 2612 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2613 rx_size += ISCSI_CRC_LEN; 2614 } 2615 2616 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2617 2618 iscsit_unmap_iovec(cmd); 2619 2620 if (rx_got != rx_size) { 2621 iscsit_rx_thread_wait_for_tcp(conn); 2622 return IMMEDIATE_DATA_CANNOT_RECOVER; 2623 } 2624 2625 if (conn->conn_ops->DataDigest) { 2626 u32 data_crc; 2627 2628 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2629 cmd->write_data_done, length, padding, 2630 cmd->pad_bytes); 2631 2632 if (checksum != data_crc) { 2633 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2634 " does not match computed 0x%08x\n", checksum, 2635 data_crc); 2636 2637 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2638 pr_err("Unable to recover from" 2639 " Immediate Data digest failure while" 2640 " in ERL=0.\n"); 2641 iscsit_reject_cmd(cmd, 2642 ISCSI_REASON_DATA_DIGEST_ERROR, 2643 (unsigned char *)hdr); 2644 return IMMEDIATE_DATA_CANNOT_RECOVER; 2645 } else { 2646 iscsit_reject_cmd(cmd, 2647 ISCSI_REASON_DATA_DIGEST_ERROR, 2648 (unsigned char *)hdr); 2649 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2650 } 2651 } else { 2652 pr_debug("Got CRC32C DataDigest 0x%08x for" 2653 " %u bytes of Immediate Data\n", checksum, 2654 length); 2655 } 2656 } 2657 2658 cmd->write_data_done += length; 2659 2660 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2661 spin_lock_bh(&cmd->istate_lock); 2662 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2663 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2664 spin_unlock_bh(&cmd->istate_lock); 2665 } 2666 2667 return IMMEDIATE_DATA_NORMAL_OPERATION; 2668 } 2669 2670 /* 2671 * Called with sess->conn_lock held. 2672 */ 2673 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2674 with active network interface */ 2675 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2676 { 2677 struct iscsi_cmd *cmd; 2678 struct iscsi_conn *conn_p; 2679 bool found = false; 2680 2681 /* 2682 * Only send a Asynchronous Message on connections whos network 2683 * interface is still functional. 2684 */ 2685 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2686 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2687 iscsit_inc_conn_usage_count(conn_p); 2688 found = true; 2689 break; 2690 } 2691 } 2692 2693 if (!found) 2694 return; 2695 2696 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2697 if (!cmd) { 2698 iscsit_dec_conn_usage_count(conn_p); 2699 return; 2700 } 2701 2702 cmd->logout_cid = conn->cid; 2703 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2704 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2705 2706 spin_lock_bh(&conn_p->cmd_lock); 2707 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2708 spin_unlock_bh(&conn_p->cmd_lock); 2709 2710 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2711 iscsit_dec_conn_usage_count(conn_p); 2712 } 2713 2714 static int iscsit_send_conn_drop_async_message( 2715 struct iscsi_cmd *cmd, 2716 struct iscsi_conn *conn) 2717 { 2718 struct iscsi_async *hdr; 2719 2720 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2721 2722 hdr = (struct iscsi_async *) cmd->pdu; 2723 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2724 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2725 cmd->init_task_tag = RESERVED_ITT; 2726 cmd->targ_xfer_tag = 0xFFFFFFFF; 2727 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2728 cmd->stat_sn = conn->stat_sn++; 2729 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2730 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2731 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2732 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2733 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2734 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2735 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2736 2737 pr_debug("Sending Connection Dropped Async Message StatSN:" 2738 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2739 cmd->logout_cid, conn->cid); 2740 2741 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2742 } 2743 2744 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2745 { 2746 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2747 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2748 wait_for_completion_interruptible_timeout( 2749 &conn->tx_half_close_comp, 2750 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2751 } 2752 } 2753 2754 void 2755 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2756 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2757 bool set_statsn) 2758 { 2759 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2760 hdr->flags = datain->flags; 2761 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2762 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2763 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2764 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2765 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2766 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2767 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2768 } 2769 } 2770 hton24(hdr->dlength, datain->length); 2771 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2772 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2773 (struct scsi_lun *)&hdr->lun); 2774 else 2775 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2776 2777 hdr->itt = cmd->init_task_tag; 2778 2779 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2780 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2781 else 2782 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2783 if (set_statsn) 2784 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2785 else 2786 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2787 2788 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2789 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2790 hdr->datasn = cpu_to_be32(datain->data_sn); 2791 hdr->offset = cpu_to_be32(datain->offset); 2792 2793 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2794 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2795 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2796 ntohl(hdr->offset), datain->length, conn->cid); 2797 } 2798 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2799 2800 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2801 { 2802 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2803 struct iscsi_datain datain; 2804 struct iscsi_datain_req *dr; 2805 int eodr = 0, ret; 2806 bool set_statsn = false; 2807 2808 memset(&datain, 0, sizeof(struct iscsi_datain)); 2809 dr = iscsit_get_datain_values(cmd, &datain); 2810 if (!dr) { 2811 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2812 cmd->init_task_tag); 2813 return -1; 2814 } 2815 /* 2816 * Be paranoid and double check the logic for now. 2817 */ 2818 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2819 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2820 " datain.length: %u exceeds cmd->data_length: %u\n", 2821 cmd->init_task_tag, datain.offset, datain.length, 2822 cmd->se_cmd.data_length); 2823 return -1; 2824 } 2825 2826 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2827 /* 2828 * Special case for successfully execution w/ both DATAIN 2829 * and Sense Data. 2830 */ 2831 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2832 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2833 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2834 else { 2835 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2836 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2837 iscsit_increment_maxcmdsn(cmd, conn->sess); 2838 cmd->stat_sn = conn->stat_sn++; 2839 set_statsn = true; 2840 } else if (dr->dr_complete == 2841 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2842 set_statsn = true; 2843 } 2844 2845 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2846 2847 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2848 if (ret < 0) 2849 return ret; 2850 2851 if (dr->dr_complete) { 2852 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2853 2 : 1; 2854 iscsit_free_datain_req(cmd, dr); 2855 } 2856 2857 return eodr; 2858 } 2859 2860 int 2861 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2862 struct iscsi_logout_rsp *hdr) 2863 { 2864 struct iscsi_conn *logout_conn = NULL; 2865 struct iscsi_conn_recovery *cr = NULL; 2866 struct iscsi_session *sess = conn->sess; 2867 /* 2868 * The actual shutting down of Sessions and/or Connections 2869 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2870 * is done in scsi_logout_post_handler(). 2871 */ 2872 switch (cmd->logout_reason) { 2873 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2874 pr_debug("iSCSI session logout successful, setting" 2875 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2876 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2877 break; 2878 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2879 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2880 break; 2881 /* 2882 * For CLOSECONNECTION logout requests carrying 2883 * a matching logout CID -> local CID, the reference 2884 * for the local CID will have been incremented in 2885 * iscsi_logout_closeconnection(). 2886 * 2887 * For CLOSECONNECTION logout requests carrying 2888 * a different CID than the connection it arrived 2889 * on, the connection responding to cmd->logout_cid 2890 * is stopped in iscsit_logout_post_handler_diffcid(). 2891 */ 2892 2893 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2894 " successful.\n", cmd->logout_cid, conn->cid); 2895 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2896 break; 2897 case ISCSI_LOGOUT_REASON_RECOVERY: 2898 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2899 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2900 break; 2901 /* 2902 * If the connection is still active from our point of view 2903 * force connection recovery to occur. 2904 */ 2905 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2906 cmd->logout_cid); 2907 if (logout_conn) { 2908 iscsit_connection_reinstatement_rcfr(logout_conn); 2909 iscsit_dec_conn_usage_count(logout_conn); 2910 } 2911 2912 cr = iscsit_get_inactive_connection_recovery_entry( 2913 conn->sess, cmd->logout_cid); 2914 if (!cr) { 2915 pr_err("Unable to locate CID: %hu for" 2916 " REMOVECONNFORRECOVERY Logout Request.\n", 2917 cmd->logout_cid); 2918 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2919 break; 2920 } 2921 2922 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2923 2924 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2925 " for recovery for CID: %hu on CID: %hu successful.\n", 2926 cmd->logout_cid, conn->cid); 2927 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2928 break; 2929 default: 2930 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2931 cmd->logout_reason); 2932 return -1; 2933 } 2934 2935 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2936 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2937 hdr->response = cmd->logout_response; 2938 hdr->itt = cmd->init_task_tag; 2939 cmd->stat_sn = conn->stat_sn++; 2940 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2941 2942 iscsit_increment_maxcmdsn(cmd, conn->sess); 2943 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2944 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2945 2946 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2947 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2948 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2949 cmd->logout_cid, conn->cid); 2950 2951 return 0; 2952 } 2953 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2954 2955 static int 2956 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2957 { 2958 int rc; 2959 2960 rc = iscsit_build_logout_rsp(cmd, conn, 2961 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2962 if (rc < 0) 2963 return rc; 2964 2965 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2966 } 2967 2968 void 2969 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2970 struct iscsi_nopin *hdr, bool nopout_response) 2971 { 2972 hdr->opcode = ISCSI_OP_NOOP_IN; 2973 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2974 hton24(hdr->dlength, cmd->buf_ptr_size); 2975 if (nopout_response) 2976 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2977 hdr->itt = cmd->init_task_tag; 2978 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2979 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2980 conn->stat_sn; 2981 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2982 2983 if (nopout_response) 2984 iscsit_increment_maxcmdsn(cmd, conn->sess); 2985 2986 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2987 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2988 2989 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2990 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2991 "Solicited" : "Unsolicited", cmd->init_task_tag, 2992 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2993 } 2994 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2995 2996 /* 2997 * Unsolicited NOPIN, either requesting a response or not. 2998 */ 2999 static int iscsit_send_unsolicited_nopin( 3000 struct iscsi_cmd *cmd, 3001 struct iscsi_conn *conn, 3002 int want_response) 3003 { 3004 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3005 int ret; 3006 3007 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3008 3009 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3010 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3011 3012 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3013 if (ret < 0) 3014 return ret; 3015 3016 spin_lock_bh(&cmd->istate_lock); 3017 cmd->i_state = want_response ? 3018 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3019 spin_unlock_bh(&cmd->istate_lock); 3020 3021 return 0; 3022 } 3023 3024 static int 3025 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3026 { 3027 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3028 3029 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3030 3031 /* 3032 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3033 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3034 */ 3035 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3036 3037 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3038 cmd->buf_ptr, 3039 cmd->buf_ptr_size); 3040 } 3041 3042 static int iscsit_send_r2t( 3043 struct iscsi_cmd *cmd, 3044 struct iscsi_conn *conn) 3045 { 3046 struct iscsi_r2t *r2t; 3047 struct iscsi_r2t_rsp *hdr; 3048 int ret; 3049 3050 r2t = iscsit_get_r2t_from_list(cmd); 3051 if (!r2t) 3052 return -1; 3053 3054 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3055 memset(hdr, 0, ISCSI_HDR_LEN); 3056 hdr->opcode = ISCSI_OP_R2T; 3057 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3058 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3059 (struct scsi_lun *)&hdr->lun); 3060 hdr->itt = cmd->init_task_tag; 3061 if (conn->conn_transport->iscsit_get_r2t_ttt) 3062 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3063 else 3064 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3065 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3066 hdr->statsn = cpu_to_be32(conn->stat_sn); 3067 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3068 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3069 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3070 hdr->data_offset = cpu_to_be32(r2t->offset); 3071 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3072 3073 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3074 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3075 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3076 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3077 r2t->offset, r2t->xfer_len, conn->cid); 3078 3079 spin_lock_bh(&cmd->r2t_lock); 3080 r2t->sent_r2t = 1; 3081 spin_unlock_bh(&cmd->r2t_lock); 3082 3083 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3084 if (ret < 0) { 3085 return ret; 3086 } 3087 3088 spin_lock_bh(&cmd->dataout_timeout_lock); 3089 iscsit_start_dataout_timer(cmd, conn); 3090 spin_unlock_bh(&cmd->dataout_timeout_lock); 3091 3092 return 0; 3093 } 3094 3095 /* 3096 * @recovery: If called from iscsi_task_reassign_complete_write() for 3097 * connection recovery. 3098 */ 3099 int iscsit_build_r2ts_for_cmd( 3100 struct iscsi_conn *conn, 3101 struct iscsi_cmd *cmd, 3102 bool recovery) 3103 { 3104 int first_r2t = 1; 3105 u32 offset = 0, xfer_len = 0; 3106 3107 spin_lock_bh(&cmd->r2t_lock); 3108 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3109 spin_unlock_bh(&cmd->r2t_lock); 3110 return 0; 3111 } 3112 3113 if (conn->sess->sess_ops->DataSequenceInOrder && 3114 !recovery) 3115 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3116 3117 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3118 if (conn->sess->sess_ops->DataSequenceInOrder) { 3119 offset = cmd->r2t_offset; 3120 3121 if (first_r2t && recovery) { 3122 int new_data_end = offset + 3123 conn->sess->sess_ops->MaxBurstLength - 3124 cmd->next_burst_len; 3125 3126 if (new_data_end > cmd->se_cmd.data_length) 3127 xfer_len = cmd->se_cmd.data_length - offset; 3128 else 3129 xfer_len = 3130 conn->sess->sess_ops->MaxBurstLength - 3131 cmd->next_burst_len; 3132 } else { 3133 int new_data_end = offset + 3134 conn->sess->sess_ops->MaxBurstLength; 3135 3136 if (new_data_end > cmd->se_cmd.data_length) 3137 xfer_len = cmd->se_cmd.data_length - offset; 3138 else 3139 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3140 } 3141 cmd->r2t_offset += xfer_len; 3142 3143 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3144 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3145 } else { 3146 struct iscsi_seq *seq; 3147 3148 seq = iscsit_get_seq_holder_for_r2t(cmd); 3149 if (!seq) { 3150 spin_unlock_bh(&cmd->r2t_lock); 3151 return -1; 3152 } 3153 3154 offset = seq->offset; 3155 xfer_len = seq->xfer_len; 3156 3157 if (cmd->seq_send_order == cmd->seq_count) 3158 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3159 } 3160 cmd->outstanding_r2ts++; 3161 first_r2t = 0; 3162 3163 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3164 spin_unlock_bh(&cmd->r2t_lock); 3165 return -1; 3166 } 3167 3168 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3169 break; 3170 } 3171 spin_unlock_bh(&cmd->r2t_lock); 3172 3173 return 0; 3174 } 3175 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3176 3177 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3178 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3179 { 3180 if (inc_stat_sn) 3181 cmd->stat_sn = conn->stat_sn++; 3182 3183 atomic_long_inc(&conn->sess->rsp_pdus); 3184 3185 memset(hdr, 0, ISCSI_HDR_LEN); 3186 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3187 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3188 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3189 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3190 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3191 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3192 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3193 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3194 } 3195 hdr->response = cmd->iscsi_response; 3196 hdr->cmd_status = cmd->se_cmd.scsi_status; 3197 hdr->itt = cmd->init_task_tag; 3198 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3199 3200 iscsit_increment_maxcmdsn(cmd, conn->sess); 3201 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3202 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3203 3204 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3205 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3206 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3207 cmd->se_cmd.scsi_status, conn->cid); 3208 } 3209 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3210 3211 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3212 { 3213 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3214 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3215 void *data_buf = NULL; 3216 u32 padding = 0, data_buf_len = 0; 3217 3218 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3219 3220 /* 3221 * Attach SENSE DATA payload to iSCSI Response PDU 3222 */ 3223 if (cmd->se_cmd.sense_buffer && 3224 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3225 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3226 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3227 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3228 3229 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3230 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3231 data_buf = cmd->sense_buffer; 3232 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3233 3234 if (padding) { 3235 memset(cmd->sense_buffer + 3236 cmd->se_cmd.scsi_sense_length, 0, padding); 3237 pr_debug("Adding %u bytes of padding to" 3238 " SENSE.\n", padding); 3239 } 3240 3241 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3242 " Response PDU\n", 3243 cmd->se_cmd.scsi_sense_length); 3244 } 3245 3246 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3247 data_buf_len); 3248 } 3249 3250 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3251 { 3252 switch (se_tmr->response) { 3253 case TMR_FUNCTION_COMPLETE: 3254 return ISCSI_TMF_RSP_COMPLETE; 3255 case TMR_TASK_DOES_NOT_EXIST: 3256 return ISCSI_TMF_RSP_NO_TASK; 3257 case TMR_LUN_DOES_NOT_EXIST: 3258 return ISCSI_TMF_RSP_NO_LUN; 3259 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3260 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3261 case TMR_FUNCTION_REJECTED: 3262 default: 3263 return ISCSI_TMF_RSP_REJECTED; 3264 } 3265 } 3266 3267 void 3268 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3269 struct iscsi_tm_rsp *hdr) 3270 { 3271 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3272 3273 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3274 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3275 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3276 hdr->itt = cmd->init_task_tag; 3277 cmd->stat_sn = conn->stat_sn++; 3278 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3279 3280 iscsit_increment_maxcmdsn(cmd, conn->sess); 3281 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3282 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3283 3284 pr_debug("Built Task Management Response ITT: 0x%08x," 3285 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3286 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3287 } 3288 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3289 3290 static int 3291 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3292 { 3293 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3294 3295 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3296 3297 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3298 } 3299 3300 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3301 { 3302 bool ret = false; 3303 3304 if (np->np_sockaddr.ss_family == AF_INET6) { 3305 const struct sockaddr_in6 sin6 = { 3306 .sin6_addr = IN6ADDR_ANY_INIT }; 3307 struct sockaddr_in6 *sock_in6 = 3308 (struct sockaddr_in6 *)&np->np_sockaddr; 3309 3310 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3311 sin6.sin6_addr.s6_addr, 16)) 3312 ret = true; 3313 } else { 3314 struct sockaddr_in * sock_in = 3315 (struct sockaddr_in *)&np->np_sockaddr; 3316 3317 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3318 ret = true; 3319 } 3320 3321 return ret; 3322 } 3323 3324 #define SENDTARGETS_BUF_LIMIT 32768U 3325 3326 static int 3327 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3328 enum iscsit_transport_type network_transport, 3329 int skip_bytes, bool *completed) 3330 { 3331 char *payload = NULL; 3332 struct iscsi_conn *conn = cmd->conn; 3333 struct iscsi_portal_group *tpg; 3334 struct iscsi_tiqn *tiqn; 3335 struct iscsi_tpg_np *tpg_np; 3336 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3337 int target_name_printed; 3338 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3339 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3340 bool active; 3341 3342 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3343 SENDTARGETS_BUF_LIMIT); 3344 3345 payload = kzalloc(buffer_len, GFP_KERNEL); 3346 if (!payload) 3347 return -ENOMEM; 3348 3349 /* 3350 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3351 * explicit case.. 3352 */ 3353 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3354 text_ptr = strchr(text_in, '='); 3355 if (!text_ptr) { 3356 pr_err("Unable to locate '=' string in text_in:" 3357 " %s\n", text_in); 3358 kfree(payload); 3359 return -EINVAL; 3360 } 3361 /* 3362 * Skip over '=' character.. 3363 */ 3364 text_ptr += 1; 3365 } 3366 3367 spin_lock(&tiqn_lock); 3368 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3369 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3370 strcmp(tiqn->tiqn, text_ptr)) { 3371 continue; 3372 } 3373 3374 target_name_printed = 0; 3375 3376 spin_lock(&tiqn->tiqn_tpg_lock); 3377 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3378 3379 /* If demo_mode_discovery=0 and generate_node_acls=0 3380 * (demo mode dislabed) do not return 3381 * TargetName+TargetAddress unless a NodeACL exists. 3382 */ 3383 3384 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3385 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3386 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3387 cmd->conn->sess->sess_ops->InitiatorName))) { 3388 continue; 3389 } 3390 3391 spin_lock(&tpg->tpg_state_lock); 3392 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3393 spin_unlock(&tpg->tpg_state_lock); 3394 3395 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3396 continue; 3397 3398 spin_lock(&tpg->tpg_np_lock); 3399 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3400 tpg_np_list) { 3401 struct iscsi_np *np = tpg_np->tpg_np; 3402 bool inaddr_any = iscsit_check_inaddr_any(np); 3403 struct sockaddr_storage *sockaddr; 3404 3405 if (np->np_network_transport != network_transport) 3406 continue; 3407 3408 if (!target_name_printed) { 3409 len = sprintf(buf, "TargetName=%s", 3410 tiqn->tiqn); 3411 len += 1; 3412 3413 if ((len + payload_len) > buffer_len) { 3414 spin_unlock(&tpg->tpg_np_lock); 3415 spin_unlock(&tiqn->tiqn_tpg_lock); 3416 end_of_buf = 1; 3417 goto eob; 3418 } 3419 3420 if (skip_bytes && len <= skip_bytes) { 3421 skip_bytes -= len; 3422 } else { 3423 memcpy(payload + payload_len, buf, len); 3424 payload_len += len; 3425 target_name_printed = 1; 3426 if (len > skip_bytes) 3427 skip_bytes = 0; 3428 } 3429 } 3430 3431 if (inaddr_any) 3432 sockaddr = &conn->local_sockaddr; 3433 else 3434 sockaddr = &np->np_sockaddr; 3435 3436 len = sprintf(buf, "TargetAddress=" 3437 "%pISpc,%hu", 3438 sockaddr, 3439 tpg->tpgt); 3440 len += 1; 3441 3442 if ((len + payload_len) > buffer_len) { 3443 spin_unlock(&tpg->tpg_np_lock); 3444 spin_unlock(&tiqn->tiqn_tpg_lock); 3445 end_of_buf = 1; 3446 goto eob; 3447 } 3448 3449 if (skip_bytes && len <= skip_bytes) { 3450 skip_bytes -= len; 3451 } else { 3452 memcpy(payload + payload_len, buf, len); 3453 payload_len += len; 3454 if (len > skip_bytes) 3455 skip_bytes = 0; 3456 } 3457 } 3458 spin_unlock(&tpg->tpg_np_lock); 3459 } 3460 spin_unlock(&tiqn->tiqn_tpg_lock); 3461 eob: 3462 if (end_of_buf) { 3463 *completed = false; 3464 break; 3465 } 3466 3467 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3468 break; 3469 } 3470 spin_unlock(&tiqn_lock); 3471 3472 cmd->buf_ptr = payload; 3473 3474 return payload_len; 3475 } 3476 3477 int 3478 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3479 struct iscsi_text_rsp *hdr, 3480 enum iscsit_transport_type network_transport) 3481 { 3482 int text_length, padding; 3483 bool completed = true; 3484 3485 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3486 cmd->read_data_done, 3487 &completed); 3488 if (text_length < 0) 3489 return text_length; 3490 3491 if (completed) { 3492 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3493 } else { 3494 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3495 cmd->read_data_done += text_length; 3496 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3497 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3498 } 3499 hdr->opcode = ISCSI_OP_TEXT_RSP; 3500 padding = ((-text_length) & 3); 3501 hton24(hdr->dlength, text_length); 3502 hdr->itt = cmd->init_task_tag; 3503 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3504 cmd->stat_sn = conn->stat_sn++; 3505 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3506 3507 iscsit_increment_maxcmdsn(cmd, conn->sess); 3508 /* 3509 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3510 * correctly increment MaxCmdSN for each response answering a 3511 * non immediate text request with a valid CmdSN. 3512 */ 3513 cmd->maxcmdsn_inc = 0; 3514 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3515 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3516 3517 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3518 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3519 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3520 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3521 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3522 3523 return text_length + padding; 3524 } 3525 EXPORT_SYMBOL(iscsit_build_text_rsp); 3526 3527 static int iscsit_send_text_rsp( 3528 struct iscsi_cmd *cmd, 3529 struct iscsi_conn *conn) 3530 { 3531 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3532 int text_length; 3533 3534 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3535 conn->conn_transport->transport_type); 3536 if (text_length < 0) 3537 return text_length; 3538 3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3540 cmd->buf_ptr, 3541 text_length); 3542 } 3543 3544 void 3545 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3546 struct iscsi_reject *hdr) 3547 { 3548 hdr->opcode = ISCSI_OP_REJECT; 3549 hdr->reason = cmd->reject_reason; 3550 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3551 hton24(hdr->dlength, ISCSI_HDR_LEN); 3552 hdr->ffffffff = cpu_to_be32(0xffffffff); 3553 cmd->stat_sn = conn->stat_sn++; 3554 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3556 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3557 3558 } 3559 EXPORT_SYMBOL(iscsit_build_reject); 3560 3561 static int iscsit_send_reject( 3562 struct iscsi_cmd *cmd, 3563 struct iscsi_conn *conn) 3564 { 3565 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3566 3567 iscsit_build_reject(cmd, conn, hdr); 3568 3569 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3570 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3571 3572 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3573 cmd->buf_ptr, 3574 ISCSI_HDR_LEN); 3575 } 3576 3577 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3578 { 3579 int ord, cpu; 3580 /* 3581 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3582 * within iscsit_start_kthreads() 3583 * 3584 * Here we use bitmap_id to determine which CPU that this 3585 * iSCSI connection's RX/TX threads will be scheduled to 3586 * execute upon. 3587 */ 3588 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3589 for_each_online_cpu(cpu) { 3590 if (ord-- == 0) { 3591 cpumask_set_cpu(cpu, conn->conn_cpumask); 3592 return; 3593 } 3594 } 3595 /* 3596 * This should never be reached.. 3597 */ 3598 dump_stack(); 3599 cpumask_setall(conn->conn_cpumask); 3600 } 3601 3602 int 3603 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3604 { 3605 int ret; 3606 3607 switch (state) { 3608 case ISTATE_SEND_R2T: 3609 ret = iscsit_send_r2t(cmd, conn); 3610 if (ret < 0) 3611 goto err; 3612 break; 3613 case ISTATE_REMOVE: 3614 spin_lock_bh(&conn->cmd_lock); 3615 list_del_init(&cmd->i_conn_node); 3616 spin_unlock_bh(&conn->cmd_lock); 3617 3618 iscsit_free_cmd(cmd, false); 3619 break; 3620 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3621 iscsit_mod_nopin_response_timer(conn); 3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3623 if (ret < 0) 3624 goto err; 3625 break; 3626 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3627 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3628 if (ret < 0) 3629 goto err; 3630 break; 3631 default: 3632 pr_err("Unknown Opcode: 0x%02x ITT:" 3633 " 0x%08x, i_state: %d on CID: %hu\n", 3634 cmd->iscsi_opcode, cmd->init_task_tag, state, 3635 conn->cid); 3636 goto err; 3637 } 3638 3639 return 0; 3640 3641 err: 3642 return -1; 3643 } 3644 EXPORT_SYMBOL(iscsit_immediate_queue); 3645 3646 static int 3647 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3648 { 3649 struct iscsit_transport *t = conn->conn_transport; 3650 struct iscsi_queue_req *qr; 3651 struct iscsi_cmd *cmd; 3652 u8 state; 3653 int ret; 3654 3655 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3656 atomic_set(&conn->check_immediate_queue, 0); 3657 cmd = qr->cmd; 3658 state = qr->state; 3659 kmem_cache_free(lio_qr_cache, qr); 3660 3661 ret = t->iscsit_immediate_queue(conn, cmd, state); 3662 if (ret < 0) 3663 return ret; 3664 } 3665 3666 return 0; 3667 } 3668 3669 int 3670 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3671 { 3672 int ret; 3673 3674 check_rsp_state: 3675 switch (state) { 3676 case ISTATE_SEND_DATAIN: 3677 ret = iscsit_send_datain(cmd, conn); 3678 if (ret < 0) 3679 goto err; 3680 else if (!ret) 3681 /* more drs */ 3682 goto check_rsp_state; 3683 else if (ret == 1) { 3684 /* all done */ 3685 spin_lock_bh(&cmd->istate_lock); 3686 cmd->i_state = ISTATE_SENT_STATUS; 3687 spin_unlock_bh(&cmd->istate_lock); 3688 3689 if (atomic_read(&conn->check_immediate_queue)) 3690 return 1; 3691 3692 return 0; 3693 } else if (ret == 2) { 3694 /* Still must send status, 3695 SCF_TRANSPORT_TASK_SENSE was set */ 3696 spin_lock_bh(&cmd->istate_lock); 3697 cmd->i_state = ISTATE_SEND_STATUS; 3698 spin_unlock_bh(&cmd->istate_lock); 3699 state = ISTATE_SEND_STATUS; 3700 goto check_rsp_state; 3701 } 3702 3703 break; 3704 case ISTATE_SEND_STATUS: 3705 case ISTATE_SEND_STATUS_RECOVERY: 3706 ret = iscsit_send_response(cmd, conn); 3707 break; 3708 case ISTATE_SEND_LOGOUTRSP: 3709 ret = iscsit_send_logout(cmd, conn); 3710 break; 3711 case ISTATE_SEND_ASYNCMSG: 3712 ret = iscsit_send_conn_drop_async_message( 3713 cmd, conn); 3714 break; 3715 case ISTATE_SEND_NOPIN: 3716 ret = iscsit_send_nopin(cmd, conn); 3717 break; 3718 case ISTATE_SEND_REJECT: 3719 ret = iscsit_send_reject(cmd, conn); 3720 break; 3721 case ISTATE_SEND_TASKMGTRSP: 3722 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3723 if (ret != 0) 3724 break; 3725 ret = iscsit_tmr_post_handler(cmd, conn); 3726 if (ret != 0) 3727 iscsit_fall_back_to_erl0(conn->sess); 3728 break; 3729 case ISTATE_SEND_TEXTRSP: 3730 ret = iscsit_send_text_rsp(cmd, conn); 3731 break; 3732 default: 3733 pr_err("Unknown Opcode: 0x%02x ITT:" 3734 " 0x%08x, i_state: %d on CID: %hu\n", 3735 cmd->iscsi_opcode, cmd->init_task_tag, 3736 state, conn->cid); 3737 goto err; 3738 } 3739 if (ret < 0) 3740 goto err; 3741 3742 switch (state) { 3743 case ISTATE_SEND_LOGOUTRSP: 3744 if (!iscsit_logout_post_handler(cmd, conn)) 3745 return -ECONNRESET; 3746 /* fall through */ 3747 case ISTATE_SEND_STATUS: 3748 case ISTATE_SEND_ASYNCMSG: 3749 case ISTATE_SEND_NOPIN: 3750 case ISTATE_SEND_STATUS_RECOVERY: 3751 case ISTATE_SEND_TEXTRSP: 3752 case ISTATE_SEND_TASKMGTRSP: 3753 case ISTATE_SEND_REJECT: 3754 spin_lock_bh(&cmd->istate_lock); 3755 cmd->i_state = ISTATE_SENT_STATUS; 3756 spin_unlock_bh(&cmd->istate_lock); 3757 break; 3758 default: 3759 pr_err("Unknown Opcode: 0x%02x ITT:" 3760 " 0x%08x, i_state: %d on CID: %hu\n", 3761 cmd->iscsi_opcode, cmd->init_task_tag, 3762 cmd->i_state, conn->cid); 3763 goto err; 3764 } 3765 3766 if (atomic_read(&conn->check_immediate_queue)) 3767 return 1; 3768 3769 return 0; 3770 3771 err: 3772 return -1; 3773 } 3774 EXPORT_SYMBOL(iscsit_response_queue); 3775 3776 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3777 { 3778 struct iscsit_transport *t = conn->conn_transport; 3779 struct iscsi_queue_req *qr; 3780 struct iscsi_cmd *cmd; 3781 u8 state; 3782 int ret; 3783 3784 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3785 cmd = qr->cmd; 3786 state = qr->state; 3787 kmem_cache_free(lio_qr_cache, qr); 3788 3789 ret = t->iscsit_response_queue(conn, cmd, state); 3790 if (ret == 1 || ret < 0) 3791 return ret; 3792 } 3793 3794 return 0; 3795 } 3796 3797 int iscsi_target_tx_thread(void *arg) 3798 { 3799 int ret = 0; 3800 struct iscsi_conn *conn = arg; 3801 bool conn_freed = false; 3802 3803 /* 3804 * Allow ourselves to be interrupted by SIGINT so that a 3805 * connection recovery / failure event can be triggered externally. 3806 */ 3807 allow_signal(SIGINT); 3808 3809 while (!kthread_should_stop()) { 3810 /* 3811 * Ensure that both TX and RX per connection kthreads 3812 * are scheduled to run on the same CPU. 3813 */ 3814 iscsit_thread_check_cpumask(conn, current, 1); 3815 3816 wait_event_interruptible(conn->queues_wq, 3817 !iscsit_conn_all_queues_empty(conn)); 3818 3819 if (signal_pending(current)) 3820 goto transport_err; 3821 3822 get_immediate: 3823 ret = iscsit_handle_immediate_queue(conn); 3824 if (ret < 0) 3825 goto transport_err; 3826 3827 ret = iscsit_handle_response_queue(conn); 3828 if (ret == 1) { 3829 goto get_immediate; 3830 } else if (ret == -ECONNRESET) { 3831 conn_freed = true; 3832 goto out; 3833 } else if (ret < 0) { 3834 goto transport_err; 3835 } 3836 } 3837 3838 transport_err: 3839 /* 3840 * Avoid the normal connection failure code-path if this connection 3841 * is still within LOGIN mode, and iscsi_np process context is 3842 * responsible for cleaning up the early connection failure. 3843 */ 3844 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3845 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3846 out: 3847 if (!conn_freed) { 3848 while (!kthread_should_stop()) { 3849 msleep(100); 3850 } 3851 } 3852 return 0; 3853 } 3854 3855 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3856 { 3857 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3858 struct iscsi_cmd *cmd; 3859 int ret = 0; 3860 3861 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3862 case ISCSI_OP_SCSI_CMD: 3863 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3864 if (!cmd) 3865 goto reject; 3866 3867 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3868 break; 3869 case ISCSI_OP_SCSI_DATA_OUT: 3870 ret = iscsit_handle_data_out(conn, buf); 3871 break; 3872 case ISCSI_OP_NOOP_OUT: 3873 cmd = NULL; 3874 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3875 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3876 if (!cmd) 3877 goto reject; 3878 } 3879 ret = iscsit_handle_nop_out(conn, cmd, buf); 3880 break; 3881 case ISCSI_OP_SCSI_TMFUNC: 3882 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3883 if (!cmd) 3884 goto reject; 3885 3886 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3887 break; 3888 case ISCSI_OP_TEXT: 3889 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3890 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3891 if (!cmd) 3892 goto reject; 3893 } else { 3894 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3895 if (!cmd) 3896 goto reject; 3897 } 3898 3899 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3900 break; 3901 case ISCSI_OP_LOGOUT: 3902 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3903 if (!cmd) 3904 goto reject; 3905 3906 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3907 if (ret > 0) 3908 wait_for_completion_timeout(&conn->conn_logout_comp, 3909 SECONDS_FOR_LOGOUT_COMP * HZ); 3910 break; 3911 case ISCSI_OP_SNACK: 3912 ret = iscsit_handle_snack(conn, buf); 3913 break; 3914 default: 3915 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3916 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3917 pr_err("Cannot recover from unknown" 3918 " opcode while ERL=0, closing iSCSI connection.\n"); 3919 return -1; 3920 } 3921 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3922 " closing iSCSI connection.\n"); 3923 ret = -1; 3924 break; 3925 } 3926 3927 return ret; 3928 reject: 3929 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3930 } 3931 3932 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3933 { 3934 bool ret; 3935 3936 spin_lock_bh(&conn->state_lock); 3937 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3938 spin_unlock_bh(&conn->state_lock); 3939 3940 return ret; 3941 } 3942 3943 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3944 { 3945 int ret; 3946 u8 buffer[ISCSI_HDR_LEN], opcode; 3947 u32 checksum = 0, digest = 0; 3948 struct kvec iov; 3949 3950 while (!kthread_should_stop()) { 3951 /* 3952 * Ensure that both TX and RX per connection kthreads 3953 * are scheduled to run on the same CPU. 3954 */ 3955 iscsit_thread_check_cpumask(conn, current, 0); 3956 3957 memset(buffer, 0, ISCSI_HDR_LEN); 3958 memset(&iov, 0, sizeof(struct kvec)); 3959 3960 iov.iov_base = buffer; 3961 iov.iov_len = ISCSI_HDR_LEN; 3962 3963 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3964 if (ret != ISCSI_HDR_LEN) { 3965 iscsit_rx_thread_wait_for_tcp(conn); 3966 return; 3967 } 3968 3969 if (conn->conn_ops->HeaderDigest) { 3970 iov.iov_base = &digest; 3971 iov.iov_len = ISCSI_CRC_LEN; 3972 3973 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3974 if (ret != ISCSI_CRC_LEN) { 3975 iscsit_rx_thread_wait_for_tcp(conn); 3976 return; 3977 } 3978 3979 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 3980 buffer, ISCSI_HDR_LEN, 3981 0, NULL, (u8 *)&checksum); 3982 3983 if (digest != checksum) { 3984 pr_err("HeaderDigest CRC32C failed," 3985 " received 0x%08x, computed 0x%08x\n", 3986 digest, checksum); 3987 /* 3988 * Set the PDU to 0xff so it will intentionally 3989 * hit default in the switch below. 3990 */ 3991 memset(buffer, 0xff, ISCSI_HDR_LEN); 3992 atomic_long_inc(&conn->sess->conn_digest_errors); 3993 } else { 3994 pr_debug("Got HeaderDigest CRC32C" 3995 " 0x%08x\n", checksum); 3996 } 3997 } 3998 3999 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4000 return; 4001 4002 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4003 4004 if (conn->sess->sess_ops->SessionType && 4005 ((!(opcode & ISCSI_OP_TEXT)) || 4006 (!(opcode & ISCSI_OP_LOGOUT)))) { 4007 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4008 " while in Discovery Session, rejecting.\n", opcode); 4009 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4010 buffer); 4011 return; 4012 } 4013 4014 ret = iscsi_target_rx_opcode(conn, buffer); 4015 if (ret < 0) 4016 return; 4017 } 4018 } 4019 4020 int iscsi_target_rx_thread(void *arg) 4021 { 4022 int rc; 4023 struct iscsi_conn *conn = arg; 4024 bool conn_freed = false; 4025 4026 /* 4027 * Allow ourselves to be interrupted by SIGINT so that a 4028 * connection recovery / failure event can be triggered externally. 4029 */ 4030 allow_signal(SIGINT); 4031 /* 4032 * Wait for iscsi_post_login_handler() to complete before allowing 4033 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4034 */ 4035 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4036 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4037 goto out; 4038 4039 if (!conn->conn_transport->iscsit_get_rx_pdu) 4040 return 0; 4041 4042 conn->conn_transport->iscsit_get_rx_pdu(conn); 4043 4044 if (!signal_pending(current)) 4045 atomic_set(&conn->transport_failed, 1); 4046 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4047 4048 out: 4049 if (!conn_freed) { 4050 while (!kthread_should_stop()) { 4051 msleep(100); 4052 } 4053 } 4054 4055 return 0; 4056 } 4057 4058 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4059 { 4060 LIST_HEAD(tmp_list); 4061 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4062 struct iscsi_session *sess = conn->sess; 4063 /* 4064 * We expect this function to only ever be called from either RX or TX 4065 * thread context via iscsit_close_connection() once the other context 4066 * has been reset -> returned sleeping pre-handler state. 4067 */ 4068 spin_lock_bh(&conn->cmd_lock); 4069 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4070 4071 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4072 struct se_cmd *se_cmd = &cmd->se_cmd; 4073 4074 if (se_cmd->se_tfo != NULL) { 4075 spin_lock(&se_cmd->t_state_lock); 4076 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4077 spin_unlock(&se_cmd->t_state_lock); 4078 } 4079 } 4080 spin_unlock_bh(&conn->cmd_lock); 4081 4082 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4083 list_del_init(&cmd->i_conn_node); 4084 4085 iscsit_increment_maxcmdsn(cmd, sess); 4086 iscsit_free_cmd(cmd, true); 4087 4088 } 4089 } 4090 4091 static void iscsit_stop_timers_for_cmds( 4092 struct iscsi_conn *conn) 4093 { 4094 struct iscsi_cmd *cmd; 4095 4096 spin_lock_bh(&conn->cmd_lock); 4097 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4098 if (cmd->data_direction == DMA_TO_DEVICE) 4099 iscsit_stop_dataout_timer(cmd); 4100 } 4101 spin_unlock_bh(&conn->cmd_lock); 4102 } 4103 4104 int iscsit_close_connection( 4105 struct iscsi_conn *conn) 4106 { 4107 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4108 struct iscsi_session *sess = conn->sess; 4109 4110 pr_debug("Closing iSCSI connection CID %hu on SID:" 4111 " %u\n", conn->cid, sess->sid); 4112 /* 4113 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4114 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4115 * sleeping and the logout response never got sent because the 4116 * connection failed. 4117 * 4118 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4119 * to signal logout response TX interrupt completion. Go ahead and skip 4120 * this for iser since isert_rx_opcode() does not wait on logout failure, 4121 * and to avoid iscsi_conn pointer dereference in iser-target code. 4122 */ 4123 if (!conn->conn_transport->rdma_shutdown) 4124 complete(&conn->conn_logout_comp); 4125 4126 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4127 if (conn->tx_thread && 4128 cmpxchg(&conn->tx_thread_active, true, false)) { 4129 send_sig(SIGINT, conn->tx_thread, 1); 4130 kthread_stop(conn->tx_thread); 4131 } 4132 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4133 if (conn->rx_thread && 4134 cmpxchg(&conn->rx_thread_active, true, false)) { 4135 send_sig(SIGINT, conn->rx_thread, 1); 4136 kthread_stop(conn->rx_thread); 4137 } 4138 } 4139 4140 spin_lock(&iscsit_global->ts_bitmap_lock); 4141 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4142 get_order(1)); 4143 spin_unlock(&iscsit_global->ts_bitmap_lock); 4144 4145 iscsit_stop_timers_for_cmds(conn); 4146 iscsit_stop_nopin_response_timer(conn); 4147 iscsit_stop_nopin_timer(conn); 4148 4149 if (conn->conn_transport->iscsit_wait_conn) 4150 conn->conn_transport->iscsit_wait_conn(conn); 4151 4152 /* 4153 * During Connection recovery drop unacknowledged out of order 4154 * commands for this connection, and prepare the other commands 4155 * for reallegiance. 4156 * 4157 * During normal operation clear the out of order commands (but 4158 * do not free the struct iscsi_ooo_cmdsn's) and release all 4159 * struct iscsi_cmds. 4160 */ 4161 if (atomic_read(&conn->connection_recovery)) { 4162 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4163 iscsit_prepare_cmds_for_reallegiance(conn); 4164 } else { 4165 iscsit_clear_ooo_cmdsns_for_conn(conn); 4166 iscsit_release_commands_from_conn(conn); 4167 } 4168 iscsit_free_queue_reqs_for_conn(conn); 4169 4170 /* 4171 * Handle decrementing session or connection usage count if 4172 * a logout response was not able to be sent because the 4173 * connection failed. Fall back to Session Recovery here. 4174 */ 4175 if (atomic_read(&conn->conn_logout_remove)) { 4176 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4177 iscsit_dec_conn_usage_count(conn); 4178 iscsit_dec_session_usage_count(sess); 4179 } 4180 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4181 iscsit_dec_conn_usage_count(conn); 4182 4183 atomic_set(&conn->conn_logout_remove, 0); 4184 atomic_set(&sess->session_reinstatement, 0); 4185 atomic_set(&sess->session_fall_back_to_erl0, 1); 4186 } 4187 4188 spin_lock_bh(&sess->conn_lock); 4189 list_del(&conn->conn_list); 4190 4191 /* 4192 * Attempt to let the Initiator know this connection failed by 4193 * sending an Connection Dropped Async Message on another 4194 * active connection. 4195 */ 4196 if (atomic_read(&conn->connection_recovery)) 4197 iscsit_build_conn_drop_async_message(conn); 4198 4199 spin_unlock_bh(&sess->conn_lock); 4200 4201 /* 4202 * If connection reinstatement is being performed on this connection, 4203 * up the connection reinstatement semaphore that is being blocked on 4204 * in iscsit_cause_connection_reinstatement(). 4205 */ 4206 spin_lock_bh(&conn->state_lock); 4207 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4208 spin_unlock_bh(&conn->state_lock); 4209 complete(&conn->conn_wait_comp); 4210 wait_for_completion(&conn->conn_post_wait_comp); 4211 spin_lock_bh(&conn->state_lock); 4212 } 4213 4214 /* 4215 * If connection reinstatement is being performed on this connection 4216 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4217 * connection wait rcfr semaphore that is being blocked on 4218 * an iscsit_connection_reinstatement_rcfr(). 4219 */ 4220 if (atomic_read(&conn->connection_wait_rcfr)) { 4221 spin_unlock_bh(&conn->state_lock); 4222 complete(&conn->conn_wait_rcfr_comp); 4223 wait_for_completion(&conn->conn_post_wait_comp); 4224 spin_lock_bh(&conn->state_lock); 4225 } 4226 atomic_set(&conn->connection_reinstatement, 1); 4227 spin_unlock_bh(&conn->state_lock); 4228 4229 /* 4230 * If any other processes are accessing this connection pointer we 4231 * must wait until they have completed. 4232 */ 4233 iscsit_check_conn_usage_count(conn); 4234 4235 ahash_request_free(conn->conn_tx_hash); 4236 if (conn->conn_rx_hash) { 4237 struct crypto_ahash *tfm; 4238 4239 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4240 ahash_request_free(conn->conn_rx_hash); 4241 crypto_free_ahash(tfm); 4242 } 4243 4244 free_cpumask_var(conn->conn_cpumask); 4245 4246 kfree(conn->conn_ops); 4247 conn->conn_ops = NULL; 4248 4249 if (conn->sock) 4250 sock_release(conn->sock); 4251 4252 if (conn->conn_transport->iscsit_free_conn) 4253 conn->conn_transport->iscsit_free_conn(conn); 4254 4255 iscsit_put_transport(conn->conn_transport); 4256 4257 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4258 conn->conn_state = TARG_CONN_STATE_FREE; 4259 kfree(conn); 4260 4261 spin_lock_bh(&sess->conn_lock); 4262 atomic_dec(&sess->nconn); 4263 pr_debug("Decremented iSCSI connection count to %hu from node:" 4264 " %s\n", atomic_read(&sess->nconn), 4265 sess->sess_ops->InitiatorName); 4266 /* 4267 * Make sure that if one connection fails in an non ERL=2 iSCSI 4268 * Session that they all fail. 4269 */ 4270 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4271 !atomic_read(&sess->session_logout)) 4272 atomic_set(&sess->session_fall_back_to_erl0, 1); 4273 4274 /* 4275 * If this was not the last connection in the session, and we are 4276 * performing session reinstatement or falling back to ERL=0, call 4277 * iscsit_stop_session() without sleeping to shutdown the other 4278 * active connections. 4279 */ 4280 if (atomic_read(&sess->nconn)) { 4281 if (!atomic_read(&sess->session_reinstatement) && 4282 !atomic_read(&sess->session_fall_back_to_erl0)) { 4283 spin_unlock_bh(&sess->conn_lock); 4284 return 0; 4285 } 4286 if (!atomic_read(&sess->session_stop_active)) { 4287 atomic_set(&sess->session_stop_active, 1); 4288 spin_unlock_bh(&sess->conn_lock); 4289 iscsit_stop_session(sess, 0, 0); 4290 return 0; 4291 } 4292 spin_unlock_bh(&sess->conn_lock); 4293 return 0; 4294 } 4295 4296 /* 4297 * If this was the last connection in the session and one of the 4298 * following is occurring: 4299 * 4300 * Session Reinstatement is not being performed, and are falling back 4301 * to ERL=0 call iscsit_close_session(). 4302 * 4303 * Session Logout was requested. iscsit_close_session() will be called 4304 * elsewhere. 4305 * 4306 * Session Continuation is not being performed, start the Time2Retain 4307 * handler and check if sleep_on_sess_wait_sem is active. 4308 */ 4309 if (!atomic_read(&sess->session_reinstatement) && 4310 atomic_read(&sess->session_fall_back_to_erl0)) { 4311 spin_unlock_bh(&sess->conn_lock); 4312 iscsit_close_session(sess); 4313 4314 return 0; 4315 } else if (atomic_read(&sess->session_logout)) { 4316 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4317 sess->session_state = TARG_SESS_STATE_FREE; 4318 spin_unlock_bh(&sess->conn_lock); 4319 4320 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4321 complete(&sess->session_wait_comp); 4322 4323 return 0; 4324 } else { 4325 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4326 sess->session_state = TARG_SESS_STATE_FAILED; 4327 4328 if (!atomic_read(&sess->session_continuation)) { 4329 spin_unlock_bh(&sess->conn_lock); 4330 iscsit_start_time2retain_handler(sess); 4331 } else 4332 spin_unlock_bh(&sess->conn_lock); 4333 4334 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4335 complete(&sess->session_wait_comp); 4336 4337 return 0; 4338 } 4339 } 4340 4341 /* 4342 * If the iSCSI Session for the iSCSI Initiator Node exists, 4343 * forcefully shutdown the iSCSI NEXUS. 4344 */ 4345 int iscsit_close_session(struct iscsi_session *sess) 4346 { 4347 struct iscsi_portal_group *tpg = sess->tpg; 4348 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4349 4350 if (atomic_read(&sess->nconn)) { 4351 pr_err("%d connection(s) still exist for iSCSI session" 4352 " to %s\n", atomic_read(&sess->nconn), 4353 sess->sess_ops->InitiatorName); 4354 BUG(); 4355 } 4356 4357 spin_lock_bh(&se_tpg->session_lock); 4358 atomic_set(&sess->session_logout, 1); 4359 atomic_set(&sess->session_reinstatement, 1); 4360 iscsit_stop_time2retain_timer(sess); 4361 spin_unlock_bh(&se_tpg->session_lock); 4362 4363 /* 4364 * transport_deregister_session_configfs() will clear the 4365 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4366 * can be setting it again with __transport_register_session() in 4367 * iscsi_post_login_handler() again after the iscsit_stop_session() 4368 * completes in iscsi_np context. 4369 */ 4370 transport_deregister_session_configfs(sess->se_sess); 4371 4372 /* 4373 * If any other processes are accessing this session pointer we must 4374 * wait until they have completed. If we are in an interrupt (the 4375 * time2retain handler) and contain and active session usage count we 4376 * restart the timer and exit. 4377 */ 4378 if (!in_interrupt()) { 4379 if (iscsit_check_session_usage_count(sess) == 1) 4380 iscsit_stop_session(sess, 1, 1); 4381 } else { 4382 if (iscsit_check_session_usage_count(sess) == 2) { 4383 atomic_set(&sess->session_logout, 0); 4384 iscsit_start_time2retain_handler(sess); 4385 return 0; 4386 } 4387 } 4388 4389 transport_deregister_session(sess->se_sess); 4390 4391 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4392 iscsit_free_connection_recovery_entires(sess); 4393 4394 iscsit_free_all_ooo_cmdsns(sess); 4395 4396 spin_lock_bh(&se_tpg->session_lock); 4397 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4398 sess->session_state = TARG_SESS_STATE_FREE; 4399 pr_debug("Released iSCSI session from node: %s\n", 4400 sess->sess_ops->InitiatorName); 4401 tpg->nsessions--; 4402 if (tpg->tpg_tiqn) 4403 tpg->tpg_tiqn->tiqn_nsessions--; 4404 4405 pr_debug("Decremented number of active iSCSI Sessions on" 4406 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4407 4408 spin_lock(&sess_idr_lock); 4409 idr_remove(&sess_idr, sess->session_index); 4410 spin_unlock(&sess_idr_lock); 4411 4412 kfree(sess->sess_ops); 4413 sess->sess_ops = NULL; 4414 spin_unlock_bh(&se_tpg->session_lock); 4415 4416 kfree(sess); 4417 return 0; 4418 } 4419 4420 static void iscsit_logout_post_handler_closesession( 4421 struct iscsi_conn *conn) 4422 { 4423 struct iscsi_session *sess = conn->sess; 4424 int sleep = 1; 4425 /* 4426 * Traditional iscsi/tcp will invoke this logic from TX thread 4427 * context during session logout, so clear tx_thread_active and 4428 * sleep if iscsit_close_connection() has not already occured. 4429 * 4430 * Since iser-target invokes this logic from it's own workqueue, 4431 * always sleep waiting for RX/TX thread shutdown to complete 4432 * within iscsit_close_connection(). 4433 */ 4434 if (!conn->conn_transport->rdma_shutdown) { 4435 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4436 if (!sleep) 4437 return; 4438 } 4439 4440 atomic_set(&conn->conn_logout_remove, 0); 4441 complete(&conn->conn_logout_comp); 4442 4443 iscsit_dec_conn_usage_count(conn); 4444 iscsit_stop_session(sess, sleep, sleep); 4445 iscsit_dec_session_usage_count(sess); 4446 iscsit_close_session(sess); 4447 } 4448 4449 static void iscsit_logout_post_handler_samecid( 4450 struct iscsi_conn *conn) 4451 { 4452 int sleep = 1; 4453 4454 if (!conn->conn_transport->rdma_shutdown) { 4455 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4456 if (!sleep) 4457 return; 4458 } 4459 4460 atomic_set(&conn->conn_logout_remove, 0); 4461 complete(&conn->conn_logout_comp); 4462 4463 iscsit_cause_connection_reinstatement(conn, sleep); 4464 iscsit_dec_conn_usage_count(conn); 4465 } 4466 4467 static void iscsit_logout_post_handler_diffcid( 4468 struct iscsi_conn *conn, 4469 u16 cid) 4470 { 4471 struct iscsi_conn *l_conn; 4472 struct iscsi_session *sess = conn->sess; 4473 bool conn_found = false; 4474 4475 if (!sess) 4476 return; 4477 4478 spin_lock_bh(&sess->conn_lock); 4479 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4480 if (l_conn->cid == cid) { 4481 iscsit_inc_conn_usage_count(l_conn); 4482 conn_found = true; 4483 break; 4484 } 4485 } 4486 spin_unlock_bh(&sess->conn_lock); 4487 4488 if (!conn_found) 4489 return; 4490 4491 if (l_conn->sock) 4492 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4493 4494 spin_lock_bh(&l_conn->state_lock); 4495 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4496 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4497 spin_unlock_bh(&l_conn->state_lock); 4498 4499 iscsit_cause_connection_reinstatement(l_conn, 1); 4500 iscsit_dec_conn_usage_count(l_conn); 4501 } 4502 4503 /* 4504 * Return of 0 causes the TX thread to restart. 4505 */ 4506 int iscsit_logout_post_handler( 4507 struct iscsi_cmd *cmd, 4508 struct iscsi_conn *conn) 4509 { 4510 int ret = 0; 4511 4512 switch (cmd->logout_reason) { 4513 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4514 switch (cmd->logout_response) { 4515 case ISCSI_LOGOUT_SUCCESS: 4516 case ISCSI_LOGOUT_CLEANUP_FAILED: 4517 default: 4518 iscsit_logout_post_handler_closesession(conn); 4519 break; 4520 } 4521 ret = 0; 4522 break; 4523 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4524 if (conn->cid == cmd->logout_cid) { 4525 switch (cmd->logout_response) { 4526 case ISCSI_LOGOUT_SUCCESS: 4527 case ISCSI_LOGOUT_CLEANUP_FAILED: 4528 default: 4529 iscsit_logout_post_handler_samecid(conn); 4530 break; 4531 } 4532 ret = 0; 4533 } else { 4534 switch (cmd->logout_response) { 4535 case ISCSI_LOGOUT_SUCCESS: 4536 iscsit_logout_post_handler_diffcid(conn, 4537 cmd->logout_cid); 4538 break; 4539 case ISCSI_LOGOUT_CID_NOT_FOUND: 4540 case ISCSI_LOGOUT_CLEANUP_FAILED: 4541 default: 4542 break; 4543 } 4544 ret = 1; 4545 } 4546 break; 4547 case ISCSI_LOGOUT_REASON_RECOVERY: 4548 switch (cmd->logout_response) { 4549 case ISCSI_LOGOUT_SUCCESS: 4550 case ISCSI_LOGOUT_CID_NOT_FOUND: 4551 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4552 case ISCSI_LOGOUT_CLEANUP_FAILED: 4553 default: 4554 break; 4555 } 4556 ret = 1; 4557 break; 4558 default: 4559 break; 4560 4561 } 4562 return ret; 4563 } 4564 EXPORT_SYMBOL(iscsit_logout_post_handler); 4565 4566 void iscsit_fail_session(struct iscsi_session *sess) 4567 { 4568 struct iscsi_conn *conn; 4569 4570 spin_lock_bh(&sess->conn_lock); 4571 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4572 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4573 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4574 } 4575 spin_unlock_bh(&sess->conn_lock); 4576 4577 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4578 sess->session_state = TARG_SESS_STATE_FAILED; 4579 } 4580 4581 int iscsit_free_session(struct iscsi_session *sess) 4582 { 4583 u16 conn_count = atomic_read(&sess->nconn); 4584 struct iscsi_conn *conn, *conn_tmp = NULL; 4585 int is_last; 4586 4587 spin_lock_bh(&sess->conn_lock); 4588 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4589 4590 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4591 conn_list) { 4592 if (conn_count == 0) 4593 break; 4594 4595 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4596 is_last = 1; 4597 } else { 4598 iscsit_inc_conn_usage_count(conn_tmp); 4599 is_last = 0; 4600 } 4601 iscsit_inc_conn_usage_count(conn); 4602 4603 spin_unlock_bh(&sess->conn_lock); 4604 iscsit_cause_connection_reinstatement(conn, 1); 4605 spin_lock_bh(&sess->conn_lock); 4606 4607 iscsit_dec_conn_usage_count(conn); 4608 if (is_last == 0) 4609 iscsit_dec_conn_usage_count(conn_tmp); 4610 4611 conn_count--; 4612 } 4613 4614 if (atomic_read(&sess->nconn)) { 4615 spin_unlock_bh(&sess->conn_lock); 4616 wait_for_completion(&sess->session_wait_comp); 4617 } else 4618 spin_unlock_bh(&sess->conn_lock); 4619 4620 iscsit_close_session(sess); 4621 return 0; 4622 } 4623 4624 void iscsit_stop_session( 4625 struct iscsi_session *sess, 4626 int session_sleep, 4627 int connection_sleep) 4628 { 4629 u16 conn_count = atomic_read(&sess->nconn); 4630 struct iscsi_conn *conn, *conn_tmp = NULL; 4631 int is_last; 4632 4633 spin_lock_bh(&sess->conn_lock); 4634 if (session_sleep) 4635 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4636 4637 if (connection_sleep) { 4638 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4639 conn_list) { 4640 if (conn_count == 0) 4641 break; 4642 4643 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4644 is_last = 1; 4645 } else { 4646 iscsit_inc_conn_usage_count(conn_tmp); 4647 is_last = 0; 4648 } 4649 iscsit_inc_conn_usage_count(conn); 4650 4651 spin_unlock_bh(&sess->conn_lock); 4652 iscsit_cause_connection_reinstatement(conn, 1); 4653 spin_lock_bh(&sess->conn_lock); 4654 4655 iscsit_dec_conn_usage_count(conn); 4656 if (is_last == 0) 4657 iscsit_dec_conn_usage_count(conn_tmp); 4658 conn_count--; 4659 } 4660 } else { 4661 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4662 iscsit_cause_connection_reinstatement(conn, 0); 4663 } 4664 4665 if (session_sleep && atomic_read(&sess->nconn)) { 4666 spin_unlock_bh(&sess->conn_lock); 4667 wait_for_completion(&sess->session_wait_comp); 4668 } else 4669 spin_unlock_bh(&sess->conn_lock); 4670 } 4671 4672 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4673 { 4674 struct iscsi_session *sess; 4675 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4676 struct se_session *se_sess, *se_sess_tmp; 4677 LIST_HEAD(free_list); 4678 int session_count = 0; 4679 4680 spin_lock_bh(&se_tpg->session_lock); 4681 if (tpg->nsessions && !force) { 4682 spin_unlock_bh(&se_tpg->session_lock); 4683 return -1; 4684 } 4685 4686 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4687 sess_list) { 4688 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4689 4690 spin_lock(&sess->conn_lock); 4691 if (atomic_read(&sess->session_fall_back_to_erl0) || 4692 atomic_read(&sess->session_logout) || 4693 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4694 spin_unlock(&sess->conn_lock); 4695 continue; 4696 } 4697 atomic_set(&sess->session_reinstatement, 1); 4698 atomic_set(&sess->session_fall_back_to_erl0, 1); 4699 spin_unlock(&sess->conn_lock); 4700 4701 list_move_tail(&se_sess->sess_list, &free_list); 4702 } 4703 spin_unlock_bh(&se_tpg->session_lock); 4704 4705 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4706 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4707 4708 iscsit_free_session(sess); 4709 session_count++; 4710 } 4711 4712 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4713 " Group: %hu\n", session_count, tpg->tpgt); 4714 return 0; 4715 } 4716 4717 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4718 MODULE_VERSION("4.1.x"); 4719 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4720 MODULE_LICENSE("GPL"); 4721 4722 module_init(iscsi_target_init_module); 4723 module_exit(iscsi_target_cleanup_module); 4724