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