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 <asm/unaligned.h> 27 #include <scsi/scsi_proto.h> 28 #include <scsi/iscsi_proto.h> 29 #include <scsi/scsi_tcq.h> 30 #include <target/target_core_base.h> 31 #include <target/target_core_fabric.h> 32 33 #include <target/iscsi/iscsi_target_core.h> 34 #include "iscsi_target_parameters.h" 35 #include "iscsi_target_seq_pdu_list.h" 36 #include "iscsi_target_datain_values.h" 37 #include "iscsi_target_erl0.h" 38 #include "iscsi_target_erl1.h" 39 #include "iscsi_target_erl2.h" 40 #include "iscsi_target_login.h" 41 #include "iscsi_target_tmr.h" 42 #include "iscsi_target_tpg.h" 43 #include "iscsi_target_util.h" 44 #include "iscsi_target.h" 45 #include "iscsi_target_device.h" 46 #include <target/iscsi/iscsi_target_stat.h> 47 48 #include <target/iscsi/iscsi_transport.h> 49 50 static LIST_HEAD(g_tiqn_list); 51 static LIST_HEAD(g_np_list); 52 static DEFINE_SPINLOCK(tiqn_lock); 53 static DEFINE_MUTEX(np_lock); 54 55 static struct idr tiqn_idr; 56 struct idr sess_idr; 57 struct mutex auth_id_lock; 58 spinlock_t sess_idr_lock; 59 60 struct iscsit_global *iscsit_global; 61 62 struct kmem_cache *lio_qr_cache; 63 struct kmem_cache *lio_dr_cache; 64 struct kmem_cache *lio_ooo_cache; 65 struct kmem_cache *lio_r2t_cache; 66 67 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 68 struct iscsi_scsi_req *, u32); 69 70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 71 { 72 struct iscsi_tiqn *tiqn = NULL; 73 74 spin_lock(&tiqn_lock); 75 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 76 if (!strcmp(tiqn->tiqn, buf)) { 77 78 spin_lock(&tiqn->tiqn_state_lock); 79 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 80 tiqn->tiqn_access_count++; 81 spin_unlock(&tiqn->tiqn_state_lock); 82 spin_unlock(&tiqn_lock); 83 return tiqn; 84 } 85 spin_unlock(&tiqn->tiqn_state_lock); 86 } 87 } 88 spin_unlock(&tiqn_lock); 89 90 return NULL; 91 } 92 93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 94 { 95 spin_lock(&tiqn->tiqn_state_lock); 96 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 97 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 98 spin_unlock(&tiqn->tiqn_state_lock); 99 return 0; 100 } 101 spin_unlock(&tiqn->tiqn_state_lock); 102 103 return -1; 104 } 105 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 107 { 108 spin_lock(&tiqn->tiqn_state_lock); 109 tiqn->tiqn_access_count--; 110 spin_unlock(&tiqn->tiqn_state_lock); 111 } 112 113 /* 114 * Note that IQN formatting is expected to be done in userspace, and 115 * no explict IQN format checks are done here. 116 */ 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 118 { 119 struct iscsi_tiqn *tiqn = NULL; 120 int ret; 121 122 if (strlen(buf) >= ISCSI_IQN_LEN) { 123 pr_err("Target IQN exceeds %d bytes\n", 124 ISCSI_IQN_LEN); 125 return ERR_PTR(-EINVAL); 126 } 127 128 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 129 if (!tiqn) { 130 pr_err("Unable to allocate struct iscsi_tiqn\n"); 131 return ERR_PTR(-ENOMEM); 132 } 133 134 sprintf(tiqn->tiqn, "%s", buf); 135 INIT_LIST_HEAD(&tiqn->tiqn_list); 136 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 137 spin_lock_init(&tiqn->tiqn_state_lock); 138 spin_lock_init(&tiqn->tiqn_tpg_lock); 139 spin_lock_init(&tiqn->sess_err_stats.lock); 140 spin_lock_init(&tiqn->login_stats.lock); 141 spin_lock_init(&tiqn->logout_stats.lock); 142 143 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 144 145 idr_preload(GFP_KERNEL); 146 spin_lock(&tiqn_lock); 147 148 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 149 if (ret < 0) { 150 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 151 spin_unlock(&tiqn_lock); 152 idr_preload_end(); 153 kfree(tiqn); 154 return ERR_PTR(ret); 155 } 156 tiqn->tiqn_index = ret; 157 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 158 159 spin_unlock(&tiqn_lock); 160 idr_preload_end(); 161 162 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 163 164 return tiqn; 165 166 } 167 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 169 { 170 /* 171 * Wait for accesses to said struct iscsi_tiqn to end. 172 */ 173 spin_lock(&tiqn->tiqn_state_lock); 174 while (tiqn->tiqn_access_count != 0) { 175 spin_unlock(&tiqn->tiqn_state_lock); 176 msleep(10); 177 spin_lock(&tiqn->tiqn_state_lock); 178 } 179 spin_unlock(&tiqn->tiqn_state_lock); 180 } 181 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 183 { 184 /* 185 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 186 * while holding tiqn->tiqn_state_lock. This means that all subsequent 187 * attempts to access this struct iscsi_tiqn will fail from both transport 188 * fabric and control code paths. 189 */ 190 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 191 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 192 return; 193 } 194 195 iscsit_wait_for_tiqn(tiqn); 196 197 spin_lock(&tiqn_lock); 198 list_del(&tiqn->tiqn_list); 199 idr_remove(&tiqn_idr, tiqn->tiqn_index); 200 spin_unlock(&tiqn_lock); 201 202 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 203 tiqn->tiqn); 204 kfree(tiqn); 205 } 206 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 208 { 209 int ret; 210 /* 211 * Determine if the network portal is accepting storage traffic. 212 */ 213 spin_lock_bh(&np->np_thread_lock); 214 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 215 spin_unlock_bh(&np->np_thread_lock); 216 return -1; 217 } 218 spin_unlock_bh(&np->np_thread_lock); 219 /* 220 * Determine if the portal group is accepting storage traffic. 221 */ 222 spin_lock_bh(&tpg->tpg_state_lock); 223 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 224 spin_unlock_bh(&tpg->tpg_state_lock); 225 return -1; 226 } 227 spin_unlock_bh(&tpg->tpg_state_lock); 228 229 /* 230 * Here we serialize access across the TIQN+TPG Tuple. 231 */ 232 ret = down_interruptible(&tpg->np_login_sem); 233 if (ret != 0) 234 return -1; 235 236 spin_lock_bh(&tpg->tpg_state_lock); 237 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 238 spin_unlock_bh(&tpg->tpg_state_lock); 239 up(&tpg->np_login_sem); 240 return -1; 241 } 242 spin_unlock_bh(&tpg->tpg_state_lock); 243 244 return 0; 245 } 246 247 void iscsit_login_kref_put(struct kref *kref) 248 { 249 struct iscsi_tpg_np *tpg_np = container_of(kref, 250 struct iscsi_tpg_np, tpg_np_kref); 251 252 complete(&tpg_np->tpg_np_comp); 253 } 254 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 256 struct iscsi_tpg_np *tpg_np) 257 { 258 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 259 260 up(&tpg->np_login_sem); 261 262 if (tpg_np) 263 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 264 265 if (tiqn) 266 iscsit_put_tiqn_for_login(tiqn); 267 268 return 0; 269 } 270 271 bool iscsit_check_np_match( 272 struct sockaddr_storage *sockaddr, 273 struct iscsi_np *np, 274 int network_transport) 275 { 276 struct sockaddr_in *sock_in, *sock_in_e; 277 struct sockaddr_in6 *sock_in6, *sock_in6_e; 278 bool ip_match = false; 279 u16 port, port_e; 280 281 if (sockaddr->ss_family == AF_INET6) { 282 sock_in6 = (struct sockaddr_in6 *)sockaddr; 283 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 284 285 if (!memcmp(&sock_in6->sin6_addr.in6_u, 286 &sock_in6_e->sin6_addr.in6_u, 287 sizeof(struct in6_addr))) 288 ip_match = true; 289 290 port = ntohs(sock_in6->sin6_port); 291 port_e = ntohs(sock_in6_e->sin6_port); 292 } else { 293 sock_in = (struct sockaddr_in *)sockaddr; 294 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 295 296 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 297 ip_match = true; 298 299 port = ntohs(sock_in->sin_port); 300 port_e = ntohs(sock_in_e->sin_port); 301 } 302 303 if (ip_match && (port_e == port) && 304 (np->np_network_transport == network_transport)) 305 return true; 306 307 return false; 308 } 309 310 /* 311 * Called with mutex np_lock held 312 */ 313 static struct iscsi_np *iscsit_get_np( 314 struct sockaddr_storage *sockaddr, 315 int network_transport) 316 { 317 struct iscsi_np *np; 318 bool match; 319 320 list_for_each_entry(np, &g_np_list, np_list) { 321 spin_lock_bh(&np->np_thread_lock); 322 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 323 spin_unlock_bh(&np->np_thread_lock); 324 continue; 325 } 326 327 match = iscsit_check_np_match(sockaddr, np, network_transport); 328 if (match) { 329 /* 330 * Increment the np_exports reference count now to 331 * prevent iscsit_del_np() below from being called 332 * while iscsi_tpg_add_network_portal() is called. 333 */ 334 np->np_exports++; 335 spin_unlock_bh(&np->np_thread_lock); 336 return np; 337 } 338 spin_unlock_bh(&np->np_thread_lock); 339 } 340 341 return NULL; 342 } 343 344 struct iscsi_np *iscsit_add_np( 345 struct sockaddr_storage *sockaddr, 346 int network_transport) 347 { 348 struct iscsi_np *np; 349 int ret; 350 351 mutex_lock(&np_lock); 352 353 /* 354 * Locate the existing struct iscsi_np if already active.. 355 */ 356 np = iscsit_get_np(sockaddr, network_transport); 357 if (np) { 358 mutex_unlock(&np_lock); 359 return np; 360 } 361 362 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 363 if (!np) { 364 pr_err("Unable to allocate memory for struct iscsi_np\n"); 365 mutex_unlock(&np_lock); 366 return ERR_PTR(-ENOMEM); 367 } 368 369 np->np_flags |= NPF_IP_NETWORK; 370 np->np_network_transport = network_transport; 371 spin_lock_init(&np->np_thread_lock); 372 init_completion(&np->np_restart_comp); 373 INIT_LIST_HEAD(&np->np_list); 374 375 ret = iscsi_target_setup_login_socket(np, sockaddr); 376 if (ret != 0) { 377 kfree(np); 378 mutex_unlock(&np_lock); 379 return ERR_PTR(ret); 380 } 381 382 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 383 if (IS_ERR(np->np_thread)) { 384 pr_err("Unable to create kthread: iscsi_np\n"); 385 ret = PTR_ERR(np->np_thread); 386 kfree(np); 387 mutex_unlock(&np_lock); 388 return ERR_PTR(ret); 389 } 390 /* 391 * Increment the np_exports reference count now to prevent 392 * iscsit_del_np() below from being run while a new call to 393 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 394 * active. We don't need to hold np->np_thread_lock at this 395 * point because iscsi_np has not been added to g_np_list yet. 396 */ 397 np->np_exports = 1; 398 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 399 400 list_add_tail(&np->np_list, &g_np_list); 401 mutex_unlock(&np_lock); 402 403 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 404 &np->np_sockaddr, np->np_transport->name); 405 406 return np; 407 } 408 409 int iscsit_reset_np_thread( 410 struct iscsi_np *np, 411 struct iscsi_tpg_np *tpg_np, 412 struct iscsi_portal_group *tpg, 413 bool shutdown) 414 { 415 spin_lock_bh(&np->np_thread_lock); 416 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 417 spin_unlock_bh(&np->np_thread_lock); 418 return 0; 419 } 420 np->np_thread_state = ISCSI_NP_THREAD_RESET; 421 422 if (np->np_thread) { 423 spin_unlock_bh(&np->np_thread_lock); 424 send_sig(SIGINT, np->np_thread, 1); 425 wait_for_completion(&np->np_restart_comp); 426 spin_lock_bh(&np->np_thread_lock); 427 } 428 spin_unlock_bh(&np->np_thread_lock); 429 430 if (tpg_np && shutdown) { 431 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 432 433 wait_for_completion(&tpg_np->tpg_np_comp); 434 } 435 436 return 0; 437 } 438 439 static void iscsit_free_np(struct iscsi_np *np) 440 { 441 if (np->np_socket) 442 sock_release(np->np_socket); 443 } 444 445 int iscsit_del_np(struct iscsi_np *np) 446 { 447 spin_lock_bh(&np->np_thread_lock); 448 np->np_exports--; 449 if (np->np_exports) { 450 np->enabled = true; 451 spin_unlock_bh(&np->np_thread_lock); 452 return 0; 453 } 454 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 455 spin_unlock_bh(&np->np_thread_lock); 456 457 if (np->np_thread) { 458 /* 459 * We need to send the signal to wakeup Linux/Net 460 * which may be sleeping in sock_accept().. 461 */ 462 send_sig(SIGINT, np->np_thread, 1); 463 kthread_stop(np->np_thread); 464 np->np_thread = NULL; 465 } 466 467 np->np_transport->iscsit_free_np(np); 468 469 mutex_lock(&np_lock); 470 list_del(&np->np_list); 471 mutex_unlock(&np_lock); 472 473 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 474 &np->np_sockaddr, np->np_transport->name); 475 476 iscsit_put_transport(np->np_transport); 477 kfree(np); 478 return 0; 479 } 480 481 static void iscsit_get_rx_pdu(struct iscsi_conn *); 482 483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 484 { 485 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 486 return 0; 487 } 488 EXPORT_SYMBOL(iscsit_queue_rsp); 489 490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 491 { 492 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD); 493 494 spin_lock_bh(&conn->cmd_lock); 495 if (!list_empty(&cmd->i_conn_node) && 496 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 497 list_del_init(&cmd->i_conn_node); 498 spin_unlock_bh(&conn->cmd_lock); 499 500 __iscsit_free_cmd(cmd, scsi_cmd, true); 501 } 502 EXPORT_SYMBOL(iscsit_aborted_task); 503 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 505 u32, u32, u8 *, u8 *); 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 507 508 static int 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 510 const void *data_buf, u32 data_buf_len) 511 { 512 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 513 struct kvec *iov; 514 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 515 int ret; 516 517 iov = &cmd->iov_misc[0]; 518 iov[niov].iov_base = cmd->pdu; 519 iov[niov++].iov_len = ISCSI_HDR_LEN; 520 521 if (conn->conn_ops->HeaderDigest) { 522 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 523 524 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 525 ISCSI_HDR_LEN, 0, NULL, 526 (u8 *)header_digest); 527 528 iov[0].iov_len += ISCSI_CRC_LEN; 529 tx_size += ISCSI_CRC_LEN; 530 pr_debug("Attaching CRC32C HeaderDigest" 531 " to opcode 0x%x 0x%08x\n", 532 hdr->opcode, *header_digest); 533 } 534 535 if (data_buf_len) { 536 u32 padding = ((-data_buf_len) & 3); 537 538 iov[niov].iov_base = (void *)data_buf; 539 iov[niov++].iov_len = data_buf_len; 540 tx_size += data_buf_len; 541 542 if (padding != 0) { 543 iov[niov].iov_base = &cmd->pad_bytes; 544 iov[niov++].iov_len = padding; 545 tx_size += padding; 546 pr_debug("Attaching %u additional" 547 " padding bytes.\n", padding); 548 } 549 550 if (conn->conn_ops->DataDigest) { 551 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 552 data_buf, data_buf_len, 553 padding, 554 (u8 *)&cmd->pad_bytes, 555 (u8 *)&cmd->data_crc); 556 557 iov[niov].iov_base = &cmd->data_crc; 558 iov[niov++].iov_len = ISCSI_CRC_LEN; 559 tx_size += ISCSI_CRC_LEN; 560 pr_debug("Attached DataDigest for %u" 561 " bytes opcode 0x%x, CRC 0x%08x\n", 562 data_buf_len, hdr->opcode, cmd->data_crc); 563 } 564 } 565 566 cmd->iov_misc_count = niov; 567 cmd->tx_size = tx_size; 568 569 ret = iscsit_send_tx_data(cmd, conn, 1); 570 if (ret < 0) { 571 iscsit_tx_thread_wait_for_tcp(conn); 572 return ret; 573 } 574 575 return 0; 576 } 577 578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 579 static void iscsit_unmap_iovec(struct iscsi_cmd *); 580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 581 u32, u32, u32, u8 *); 582 static int 583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 584 const struct iscsi_datain *datain) 585 { 586 struct kvec *iov; 587 u32 iov_count = 0, tx_size = 0; 588 int ret, iov_ret; 589 590 iov = &cmd->iov_data[0]; 591 iov[iov_count].iov_base = cmd->pdu; 592 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 593 tx_size += ISCSI_HDR_LEN; 594 595 if (conn->conn_ops->HeaderDigest) { 596 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 597 598 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 599 ISCSI_HDR_LEN, 0, NULL, 600 (u8 *)header_digest); 601 602 iov[0].iov_len += ISCSI_CRC_LEN; 603 tx_size += ISCSI_CRC_LEN; 604 605 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 606 *header_digest); 607 } 608 609 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 610 datain->offset, datain->length); 611 if (iov_ret < 0) 612 return -1; 613 614 iov_count += iov_ret; 615 tx_size += datain->length; 616 617 cmd->padding = ((-datain->length) & 3); 618 if (cmd->padding) { 619 iov[iov_count].iov_base = cmd->pad_bytes; 620 iov[iov_count++].iov_len = cmd->padding; 621 tx_size += cmd->padding; 622 623 pr_debug("Attaching %u padding bytes\n", cmd->padding); 624 } 625 626 if (conn->conn_ops->DataDigest) { 627 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 628 cmd, datain->offset, 629 datain->length, 630 cmd->padding, 631 cmd->pad_bytes); 632 633 iov[iov_count].iov_base = &cmd->data_crc; 634 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 635 tx_size += ISCSI_CRC_LEN; 636 637 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 638 datain->length + cmd->padding, cmd->data_crc); 639 } 640 641 cmd->iov_data_count = iov_count; 642 cmd->tx_size = tx_size; 643 644 ret = iscsit_fe_sendpage_sg(cmd, conn); 645 646 iscsit_unmap_iovec(cmd); 647 648 if (ret < 0) { 649 iscsit_tx_thread_wait_for_tcp(conn); 650 return ret; 651 } 652 653 return 0; 654 } 655 656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 657 struct iscsi_datain_req *dr, const void *buf, 658 u32 buf_len) 659 { 660 if (dr) 661 return iscsit_xmit_datain_pdu(conn, cmd, buf); 662 else 663 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 664 } 665 666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 667 { 668 return TARGET_PROT_NORMAL; 669 } 670 671 static struct iscsit_transport iscsi_target_transport = { 672 .name = "iSCSI/TCP", 673 .transport_type = ISCSI_TCP, 674 .rdma_shutdown = false, 675 .owner = NULL, 676 .iscsit_setup_np = iscsit_setup_np, 677 .iscsit_accept_np = iscsit_accept_np, 678 .iscsit_free_np = iscsit_free_np, 679 .iscsit_get_login_rx = iscsit_get_login_rx, 680 .iscsit_put_login_tx = iscsit_put_login_tx, 681 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 682 .iscsit_immediate_queue = iscsit_immediate_queue, 683 .iscsit_response_queue = iscsit_response_queue, 684 .iscsit_queue_data_in = iscsit_queue_rsp, 685 .iscsit_queue_status = iscsit_queue_rsp, 686 .iscsit_aborted_task = iscsit_aborted_task, 687 .iscsit_xmit_pdu = iscsit_xmit_pdu, 688 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 689 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 690 }; 691 692 static int __init iscsi_target_init_module(void) 693 { 694 int ret = 0, size; 695 696 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 697 698 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 699 if (!iscsit_global) { 700 pr_err("Unable to allocate memory for iscsit_global\n"); 701 return -1; 702 } 703 spin_lock_init(&iscsit_global->ts_bitmap_lock); 704 mutex_init(&auth_id_lock); 705 spin_lock_init(&sess_idr_lock); 706 idr_init(&tiqn_idr); 707 idr_init(&sess_idr); 708 709 ret = target_register_template(&iscsi_ops); 710 if (ret) 711 goto out; 712 713 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 714 iscsit_global->ts_bitmap = vzalloc(size); 715 if (!iscsit_global->ts_bitmap) { 716 pr_err("Unable to allocate iscsit_global->ts_bitmap\n"); 717 goto configfs_out; 718 } 719 720 lio_qr_cache = kmem_cache_create("lio_qr_cache", 721 sizeof(struct iscsi_queue_req), 722 __alignof__(struct iscsi_queue_req), 0, NULL); 723 if (!lio_qr_cache) { 724 pr_err("nable to kmem_cache_create() for" 725 " lio_qr_cache\n"); 726 goto bitmap_out; 727 } 728 729 lio_dr_cache = kmem_cache_create("lio_dr_cache", 730 sizeof(struct iscsi_datain_req), 731 __alignof__(struct iscsi_datain_req), 0, NULL); 732 if (!lio_dr_cache) { 733 pr_err("Unable to kmem_cache_create() for" 734 " lio_dr_cache\n"); 735 goto qr_out; 736 } 737 738 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 739 sizeof(struct iscsi_ooo_cmdsn), 740 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 741 if (!lio_ooo_cache) { 742 pr_err("Unable to kmem_cache_create() for" 743 " lio_ooo_cache\n"); 744 goto dr_out; 745 } 746 747 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 748 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 749 0, NULL); 750 if (!lio_r2t_cache) { 751 pr_err("Unable to kmem_cache_create() for" 752 " lio_r2t_cache\n"); 753 goto ooo_out; 754 } 755 756 iscsit_register_transport(&iscsi_target_transport); 757 758 if (iscsit_load_discovery_tpg() < 0) 759 goto r2t_out; 760 761 return ret; 762 r2t_out: 763 iscsit_unregister_transport(&iscsi_target_transport); 764 kmem_cache_destroy(lio_r2t_cache); 765 ooo_out: 766 kmem_cache_destroy(lio_ooo_cache); 767 dr_out: 768 kmem_cache_destroy(lio_dr_cache); 769 qr_out: 770 kmem_cache_destroy(lio_qr_cache); 771 bitmap_out: 772 vfree(iscsit_global->ts_bitmap); 773 configfs_out: 774 /* XXX: this probably wants it to be it's own unwind step.. */ 775 if (iscsit_global->discovery_tpg) 776 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 777 target_unregister_template(&iscsi_ops); 778 out: 779 kfree(iscsit_global); 780 return -ENOMEM; 781 } 782 783 static void __exit iscsi_target_cleanup_module(void) 784 { 785 iscsit_release_discovery_tpg(); 786 iscsit_unregister_transport(&iscsi_target_transport); 787 kmem_cache_destroy(lio_qr_cache); 788 kmem_cache_destroy(lio_dr_cache); 789 kmem_cache_destroy(lio_ooo_cache); 790 kmem_cache_destroy(lio_r2t_cache); 791 792 /* 793 * Shutdown discovery sessions and disable discovery TPG 794 */ 795 if (iscsit_global->discovery_tpg) 796 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 797 798 target_unregister_template(&iscsi_ops); 799 800 vfree(iscsit_global->ts_bitmap); 801 kfree(iscsit_global); 802 } 803 804 int iscsit_add_reject( 805 struct iscsi_conn *conn, 806 u8 reason, 807 unsigned char *buf) 808 { 809 struct iscsi_cmd *cmd; 810 811 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 812 if (!cmd) 813 return -1; 814 815 cmd->iscsi_opcode = ISCSI_OP_REJECT; 816 cmd->reject_reason = reason; 817 818 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 819 if (!cmd->buf_ptr) { 820 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 821 iscsit_free_cmd(cmd, false); 822 return -1; 823 } 824 825 spin_lock_bh(&conn->cmd_lock); 826 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 827 spin_unlock_bh(&conn->cmd_lock); 828 829 cmd->i_state = ISTATE_SEND_REJECT; 830 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 831 832 return -1; 833 } 834 EXPORT_SYMBOL(iscsit_add_reject); 835 836 static int iscsit_add_reject_from_cmd( 837 struct iscsi_cmd *cmd, 838 u8 reason, 839 bool add_to_conn, 840 unsigned char *buf) 841 { 842 struct iscsi_conn *conn; 843 844 if (!cmd->conn) { 845 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 846 cmd->init_task_tag); 847 return -1; 848 } 849 conn = cmd->conn; 850 851 cmd->iscsi_opcode = ISCSI_OP_REJECT; 852 cmd->reject_reason = reason; 853 854 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 855 if (!cmd->buf_ptr) { 856 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 857 iscsit_free_cmd(cmd, false); 858 return -1; 859 } 860 861 if (add_to_conn) { 862 spin_lock_bh(&conn->cmd_lock); 863 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 864 spin_unlock_bh(&conn->cmd_lock); 865 } 866 867 cmd->i_state = ISTATE_SEND_REJECT; 868 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 869 /* 870 * Perform the kref_put now if se_cmd has already been setup by 871 * scsit_setup_scsi_cmd() 872 */ 873 if (cmd->se_cmd.se_tfo != NULL) { 874 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 875 target_put_sess_cmd(&cmd->se_cmd); 876 } 877 return -1; 878 } 879 880 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 881 unsigned char *buf) 882 { 883 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 884 } 885 886 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 887 { 888 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 889 } 890 EXPORT_SYMBOL(iscsit_reject_cmd); 891 892 /* 893 * Map some portion of the allocated scatterlist to an iovec, suitable for 894 * kernel sockets to copy data in/out. 895 */ 896 static int iscsit_map_iovec( 897 struct iscsi_cmd *cmd, 898 struct kvec *iov, 899 u32 data_offset, 900 u32 data_length) 901 { 902 u32 i = 0; 903 struct scatterlist *sg; 904 unsigned int page_off; 905 906 /* 907 * We know each entry in t_data_sg contains a page. 908 */ 909 u32 ent = data_offset / PAGE_SIZE; 910 911 if (ent >= cmd->se_cmd.t_data_nents) { 912 pr_err("Initial page entry out-of-bounds\n"); 913 return -1; 914 } 915 916 sg = &cmd->se_cmd.t_data_sg[ent]; 917 page_off = (data_offset % PAGE_SIZE); 918 919 cmd->first_data_sg = sg; 920 cmd->first_data_sg_off = page_off; 921 922 while (data_length) { 923 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 924 925 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 926 iov[i].iov_len = cur_len; 927 928 data_length -= cur_len; 929 page_off = 0; 930 sg = sg_next(sg); 931 i++; 932 } 933 934 cmd->kmapped_nents = i; 935 936 return i; 937 } 938 939 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 940 { 941 u32 i; 942 struct scatterlist *sg; 943 944 sg = cmd->first_data_sg; 945 946 for (i = 0; i < cmd->kmapped_nents; i++) 947 kunmap(sg_page(&sg[i])); 948 } 949 950 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 951 { 952 LIST_HEAD(ack_list); 953 struct iscsi_cmd *cmd, *cmd_p; 954 955 conn->exp_statsn = exp_statsn; 956 957 if (conn->sess->sess_ops->RDMAExtensions) 958 return; 959 960 spin_lock_bh(&conn->cmd_lock); 961 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 962 spin_lock(&cmd->istate_lock); 963 if ((cmd->i_state == ISTATE_SENT_STATUS) && 964 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 965 cmd->i_state = ISTATE_REMOVE; 966 spin_unlock(&cmd->istate_lock); 967 list_move_tail(&cmd->i_conn_node, &ack_list); 968 continue; 969 } 970 spin_unlock(&cmd->istate_lock); 971 } 972 spin_unlock_bh(&conn->cmd_lock); 973 974 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 975 list_del_init(&cmd->i_conn_node); 976 iscsit_free_cmd(cmd, false); 977 } 978 } 979 980 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 981 { 982 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 983 984 iov_count += ISCSI_IOV_DATA_BUFFER; 985 986 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 987 if (!cmd->iov_data) { 988 pr_err("Unable to allocate cmd->iov_data\n"); 989 return -ENOMEM; 990 } 991 992 cmd->orig_iov_data_count = iov_count; 993 return 0; 994 } 995 996 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 997 unsigned char *buf) 998 { 999 int data_direction, payload_length; 1000 struct iscsi_scsi_req *hdr; 1001 int iscsi_task_attr; 1002 int sam_task_attr; 1003 1004 atomic_long_inc(&conn->sess->cmd_pdus); 1005 1006 hdr = (struct iscsi_scsi_req *) buf; 1007 payload_length = ntoh24(hdr->dlength); 1008 1009 /* FIXME; Add checks for AdditionalHeaderSegment */ 1010 1011 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1012 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1013 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1014 " not set. Bad iSCSI Initiator.\n"); 1015 return iscsit_add_reject_cmd(cmd, 1016 ISCSI_REASON_BOOKMARK_INVALID, buf); 1017 } 1018 1019 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1020 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1021 /* 1022 * From RFC-3720 Section 10.3.1: 1023 * 1024 * "Either or both of R and W MAY be 1 when either the 1025 * Expected Data Transfer Length and/or Bidirectional Read 1026 * Expected Data Transfer Length are 0" 1027 * 1028 * For this case, go ahead and clear the unnecssary bits 1029 * to avoid any confusion with ->data_direction. 1030 */ 1031 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1032 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1033 1034 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1035 " set when Expected Data Transfer Length is 0 for" 1036 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1037 } 1038 1039 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1040 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1041 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1042 " MUST be set if Expected Data Transfer Length is not 0." 1043 " Bad iSCSI Initiator\n"); 1044 return iscsit_add_reject_cmd(cmd, 1045 ISCSI_REASON_BOOKMARK_INVALID, buf); 1046 } 1047 1048 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1049 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1050 pr_err("Bidirectional operations not supported!\n"); 1051 return iscsit_add_reject_cmd(cmd, 1052 ISCSI_REASON_BOOKMARK_INVALID, buf); 1053 } 1054 1055 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1056 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1057 " Scsi Command PDU.\n"); 1058 return iscsit_add_reject_cmd(cmd, 1059 ISCSI_REASON_BOOKMARK_INVALID, buf); 1060 } 1061 1062 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1063 pr_err("ImmediateData=No but DataSegmentLength=%u," 1064 " protocol error.\n", payload_length); 1065 return iscsit_add_reject_cmd(cmd, 1066 ISCSI_REASON_PROTOCOL_ERROR, buf); 1067 } 1068 1069 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1070 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1071 pr_err("Expected Data Transfer Length and Length of" 1072 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1073 " bit is not set protocol error\n"); 1074 return iscsit_add_reject_cmd(cmd, 1075 ISCSI_REASON_PROTOCOL_ERROR, buf); 1076 } 1077 1078 if (payload_length > be32_to_cpu(hdr->data_length)) { 1079 pr_err("DataSegmentLength: %u is greater than" 1080 " EDTL: %u, protocol error.\n", payload_length, 1081 hdr->data_length); 1082 return iscsit_add_reject_cmd(cmd, 1083 ISCSI_REASON_PROTOCOL_ERROR, buf); 1084 } 1085 1086 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1087 pr_err("DataSegmentLength: %u is greater than" 1088 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1089 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1090 return iscsit_add_reject_cmd(cmd, 1091 ISCSI_REASON_PROTOCOL_ERROR, buf); 1092 } 1093 1094 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1095 pr_err("DataSegmentLength: %u is greater than" 1096 " FirstBurstLength: %u, protocol error.\n", 1097 payload_length, conn->sess->sess_ops->FirstBurstLength); 1098 return iscsit_add_reject_cmd(cmd, 1099 ISCSI_REASON_BOOKMARK_INVALID, buf); 1100 } 1101 1102 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1103 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1104 DMA_NONE; 1105 1106 cmd->data_direction = data_direction; 1107 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1108 /* 1109 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1110 */ 1111 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1112 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1113 sam_task_attr = TCM_SIMPLE_TAG; 1114 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1115 sam_task_attr = TCM_ORDERED_TAG; 1116 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1117 sam_task_attr = TCM_HEAD_TAG; 1118 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1119 sam_task_attr = TCM_ACA_TAG; 1120 else { 1121 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1122 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1123 sam_task_attr = TCM_SIMPLE_TAG; 1124 } 1125 1126 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1127 cmd->i_state = ISTATE_NEW_CMD; 1128 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1129 cmd->immediate_data = (payload_length) ? 1 : 0; 1130 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1131 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1132 if (cmd->unsolicited_data) 1133 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1134 1135 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1136 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1137 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1138 else 1139 cmd->targ_xfer_tag = 0xFFFFFFFF; 1140 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1141 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1142 cmd->first_burst_len = payload_length; 1143 1144 if (!conn->sess->sess_ops->RDMAExtensions && 1145 cmd->data_direction == DMA_FROM_DEVICE) { 1146 struct iscsi_datain_req *dr; 1147 1148 dr = iscsit_allocate_datain_req(); 1149 if (!dr) 1150 return iscsit_add_reject_cmd(cmd, 1151 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1152 1153 iscsit_attach_datain_req(cmd, dr); 1154 } 1155 1156 /* 1157 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1158 */ 1159 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1160 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1161 cmd->data_direction, sam_task_attr, 1162 cmd->sense_buffer + 2); 1163 1164 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1165 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1166 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1167 conn->cid); 1168 1169 target_get_sess_cmd(&cmd->se_cmd, true); 1170 1171 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1172 scsilun_to_int(&hdr->lun)); 1173 if (cmd->sense_reason) 1174 goto attach_cmd; 1175 1176 /* only used for printks or comparing with ->ref_task_tag */ 1177 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1178 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1179 if (cmd->sense_reason) { 1180 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1181 return iscsit_add_reject_cmd(cmd, 1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1183 } 1184 1185 goto attach_cmd; 1186 } 1187 1188 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1189 return iscsit_add_reject_cmd(cmd, 1190 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1191 } 1192 1193 attach_cmd: 1194 spin_lock_bh(&conn->cmd_lock); 1195 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1196 spin_unlock_bh(&conn->cmd_lock); 1197 /* 1198 * Check if we need to delay processing because of ALUA 1199 * Active/NonOptimized primary access state.. 1200 */ 1201 core_alua_check_nonop_delay(&cmd->se_cmd); 1202 1203 return 0; 1204 } 1205 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1206 1207 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1208 { 1209 iscsit_set_dataout_sequence_values(cmd); 1210 1211 spin_lock_bh(&cmd->dataout_timeout_lock); 1212 iscsit_start_dataout_timer(cmd, cmd->conn); 1213 spin_unlock_bh(&cmd->dataout_timeout_lock); 1214 } 1215 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1216 1217 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1218 struct iscsi_scsi_req *hdr) 1219 { 1220 int cmdsn_ret = 0; 1221 /* 1222 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1223 * the Immediate Bit is not set, and no Immediate 1224 * Data is attached. 1225 * 1226 * A PDU/CmdSN carrying Immediate Data can only 1227 * be processed after the DataCRC has passed. 1228 * If the DataCRC fails, the CmdSN MUST NOT 1229 * be acknowledged. (See below) 1230 */ 1231 if (!cmd->immediate_data) { 1232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1233 (unsigned char *)hdr, hdr->cmdsn); 1234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1235 return -1; 1236 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1237 target_put_sess_cmd(&cmd->se_cmd); 1238 return 0; 1239 } 1240 } 1241 1242 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1243 1244 /* 1245 * If no Immediate Data is attached, it's OK to return now. 1246 */ 1247 if (!cmd->immediate_data) { 1248 if (!cmd->sense_reason && cmd->unsolicited_data) 1249 iscsit_set_unsoliticed_dataout(cmd); 1250 if (!cmd->sense_reason) 1251 return 0; 1252 1253 target_put_sess_cmd(&cmd->se_cmd); 1254 return 0; 1255 } 1256 1257 /* 1258 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1259 * execution. These exceptions are processed in CmdSN order using 1260 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1261 */ 1262 if (cmd->sense_reason) { 1263 if (cmd->reject_reason) 1264 return 0; 1265 1266 return 1; 1267 } 1268 /* 1269 * Call directly into transport_generic_new_cmd() to perform 1270 * the backend memory allocation. 1271 */ 1272 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1273 if (cmd->sense_reason) 1274 return 1; 1275 1276 return 0; 1277 } 1278 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1279 1280 static int 1281 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1282 bool dump_payload) 1283 { 1284 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1285 /* 1286 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1287 */ 1288 if (dump_payload) 1289 goto after_immediate_data; 1290 1291 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1292 cmd->first_burst_len); 1293 after_immediate_data: 1294 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1295 /* 1296 * A PDU/CmdSN carrying Immediate Data passed 1297 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1298 * Immediate Bit is not set. 1299 */ 1300 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1301 (unsigned char *)hdr, hdr->cmdsn); 1302 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1303 return -1; 1304 1305 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1306 int rc; 1307 1308 rc = iscsit_dump_data_payload(cmd->conn, 1309 cmd->first_burst_len, 1); 1310 target_put_sess_cmd(&cmd->se_cmd); 1311 return rc; 1312 } else if (cmd->unsolicited_data) 1313 iscsit_set_unsoliticed_dataout(cmd); 1314 1315 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1316 /* 1317 * Immediate Data failed DataCRC and ERL>=1, 1318 * silently drop this PDU and let the initiator 1319 * plug the CmdSN gap. 1320 * 1321 * FIXME: Send Unsolicited NOPIN with reserved 1322 * TTT here to help the initiator figure out 1323 * the missing CmdSN, although they should be 1324 * intelligent enough to determine the missing 1325 * CmdSN and issue a retry to plug the sequence. 1326 */ 1327 cmd->i_state = ISTATE_REMOVE; 1328 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1329 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1330 return -1; 1331 1332 return 0; 1333 } 1334 1335 static int 1336 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1337 unsigned char *buf) 1338 { 1339 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1340 int rc, immed_data; 1341 bool dump_payload = false; 1342 1343 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1344 if (rc < 0) 1345 return 0; 1346 /* 1347 * Allocation iovecs needed for struct socket operations for 1348 * traditional iSCSI block I/O. 1349 */ 1350 if (iscsit_allocate_iovecs(cmd) < 0) { 1351 return iscsit_reject_cmd(cmd, 1352 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1353 } 1354 immed_data = cmd->immediate_data; 1355 1356 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1357 if (rc < 0) 1358 return rc; 1359 else if (rc > 0) 1360 dump_payload = true; 1361 1362 if (!immed_data) 1363 return 0; 1364 1365 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1366 } 1367 1368 static u32 iscsit_do_crypto_hash_sg( 1369 struct ahash_request *hash, 1370 struct iscsi_cmd *cmd, 1371 u32 data_offset, 1372 u32 data_length, 1373 u32 padding, 1374 u8 *pad_bytes) 1375 { 1376 u32 data_crc; 1377 struct scatterlist *sg; 1378 unsigned int page_off; 1379 1380 crypto_ahash_init(hash); 1381 1382 sg = cmd->first_data_sg; 1383 page_off = cmd->first_data_sg_off; 1384 1385 while (data_length) { 1386 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1387 1388 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1389 crypto_ahash_update(hash); 1390 1391 data_length -= cur_len; 1392 page_off = 0; 1393 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1394 sg = sg_next(sg); 1395 } 1396 1397 if (padding) { 1398 struct scatterlist pad_sg; 1399 1400 sg_init_one(&pad_sg, pad_bytes, padding); 1401 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1402 padding); 1403 crypto_ahash_finup(hash); 1404 } else { 1405 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1406 crypto_ahash_final(hash); 1407 } 1408 1409 return data_crc; 1410 } 1411 1412 static void iscsit_do_crypto_hash_buf( 1413 struct ahash_request *hash, 1414 const void *buf, 1415 u32 payload_length, 1416 u32 padding, 1417 u8 *pad_bytes, 1418 u8 *data_crc) 1419 { 1420 struct scatterlist sg[2]; 1421 1422 sg_init_table(sg, ARRAY_SIZE(sg)); 1423 sg_set_buf(sg, buf, payload_length); 1424 sg_set_buf(sg + 1, pad_bytes, padding); 1425 1426 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1427 1428 crypto_ahash_digest(hash); 1429 } 1430 1431 int 1432 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, 1433 struct iscsi_cmd **out_cmd) 1434 { 1435 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1436 struct iscsi_cmd *cmd = NULL; 1437 struct se_cmd *se_cmd; 1438 u32 payload_length = ntoh24(hdr->dlength); 1439 int rc; 1440 1441 if (!payload_length) { 1442 pr_warn("DataOUT payload is ZERO, ignoring.\n"); 1443 return 0; 1444 } 1445 1446 /* iSCSI write */ 1447 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1448 1449 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1450 pr_err("DataSegmentLength: %u is greater than" 1451 " MaxXmitDataSegmentLength: %u\n", payload_length, 1452 conn->conn_ops->MaxXmitDataSegmentLength); 1453 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1454 buf); 1455 } 1456 1457 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, 1458 payload_length); 1459 if (!cmd) 1460 return 0; 1461 1462 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1463 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1464 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1465 payload_length, conn->cid); 1466 1467 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1468 pr_err("Command ITT: 0x%08x received DataOUT after" 1469 " last DataOUT received, dumping payload\n", 1470 cmd->init_task_tag); 1471 return iscsit_dump_data_payload(conn, payload_length, 1); 1472 } 1473 1474 if (cmd->data_direction != DMA_TO_DEVICE) { 1475 pr_err("Command ITT: 0x%08x received DataOUT for a" 1476 " NON-WRITE command.\n", cmd->init_task_tag); 1477 return iscsit_dump_data_payload(conn, payload_length, 1); 1478 } 1479 se_cmd = &cmd->se_cmd; 1480 iscsit_mod_dataout_timer(cmd); 1481 1482 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1483 pr_err("DataOut Offset: %u, Length %u greater than" 1484 " iSCSI Command EDTL %u, protocol error.\n", 1485 hdr->offset, payload_length, cmd->se_cmd.data_length); 1486 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1487 } 1488 1489 if (cmd->unsolicited_data) { 1490 int dump_unsolicited_data = 0; 1491 1492 if (conn->sess->sess_ops->InitialR2T) { 1493 pr_err("Received unexpected unsolicited data" 1494 " while InitialR2T=Yes, protocol error.\n"); 1495 transport_send_check_condition_and_sense(&cmd->se_cmd, 1496 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1497 return -1; 1498 } 1499 /* 1500 * Special case for dealing with Unsolicited DataOUT 1501 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1502 * failures; 1503 */ 1504 1505 /* Something's amiss if we're not in WRITE_PENDING state... */ 1506 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1507 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1508 dump_unsolicited_data = 1; 1509 1510 if (dump_unsolicited_data) { 1511 /* 1512 * Check if a delayed TASK_ABORTED status needs to 1513 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1514 * received with the unsolicited data out. 1515 */ 1516 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1517 iscsit_stop_dataout_timer(cmd); 1518 1519 transport_check_aborted_status(se_cmd, 1520 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1521 return iscsit_dump_data_payload(conn, payload_length, 1); 1522 } 1523 } else { 1524 /* 1525 * For the normal solicited data path: 1526 * 1527 * Check for a delayed TASK_ABORTED status and dump any 1528 * incoming data out payload if one exists. Also, when the 1529 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1530 * data out sequence, we decrement outstanding_r2ts. Once 1531 * outstanding_r2ts reaches zero, go ahead and send the delayed 1532 * TASK_ABORTED status. 1533 */ 1534 if (se_cmd->transport_state & CMD_T_ABORTED) { 1535 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1536 if (--cmd->outstanding_r2ts < 1) { 1537 iscsit_stop_dataout_timer(cmd); 1538 transport_check_aborted_status( 1539 se_cmd, 1); 1540 } 1541 1542 return iscsit_dump_data_payload(conn, payload_length, 1); 1543 } 1544 } 1545 /* 1546 * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1547 * within-command recovery checks before receiving the payload. 1548 */ 1549 rc = iscsit_check_pre_dataout(cmd, buf); 1550 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1551 return 0; 1552 else if (rc == DATAOUT_CANNOT_RECOVER) 1553 return -1; 1554 1555 *out_cmd = cmd; 1556 return 0; 1557 } 1558 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1559 1560 static int 1561 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1562 struct iscsi_data *hdr) 1563 { 1564 struct kvec *iov; 1565 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1566 u32 payload_length = ntoh24(hdr->dlength); 1567 int iov_ret, data_crc_failed = 0; 1568 1569 rx_size += payload_length; 1570 iov = &cmd->iov_data[0]; 1571 1572 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1573 payload_length); 1574 if (iov_ret < 0) 1575 return -1; 1576 1577 iov_count += iov_ret; 1578 1579 padding = ((-payload_length) & 3); 1580 if (padding != 0) { 1581 iov[iov_count].iov_base = cmd->pad_bytes; 1582 iov[iov_count++].iov_len = padding; 1583 rx_size += padding; 1584 pr_debug("Receiving %u padding bytes.\n", padding); 1585 } 1586 1587 if (conn->conn_ops->DataDigest) { 1588 iov[iov_count].iov_base = &checksum; 1589 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1590 rx_size += ISCSI_CRC_LEN; 1591 } 1592 1593 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1594 1595 iscsit_unmap_iovec(cmd); 1596 1597 if (rx_got != rx_size) 1598 return -1; 1599 1600 if (conn->conn_ops->DataDigest) { 1601 u32 data_crc; 1602 1603 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1604 be32_to_cpu(hdr->offset), 1605 payload_length, padding, 1606 cmd->pad_bytes); 1607 1608 if (checksum != data_crc) { 1609 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1610 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1611 " does not match computed 0x%08x\n", 1612 hdr->itt, hdr->offset, payload_length, 1613 hdr->datasn, checksum, data_crc); 1614 data_crc_failed = 1; 1615 } else { 1616 pr_debug("Got CRC32C DataDigest 0x%08x for" 1617 " %u bytes of Data Out\n", checksum, 1618 payload_length); 1619 } 1620 } 1621 1622 return data_crc_failed; 1623 } 1624 1625 int 1626 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1627 bool data_crc_failed) 1628 { 1629 struct iscsi_conn *conn = cmd->conn; 1630 int rc, ooo_cmdsn; 1631 /* 1632 * Increment post receive data and CRC values or perform 1633 * within-command recovery. 1634 */ 1635 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1636 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1637 return 0; 1638 else if (rc == DATAOUT_SEND_R2T) { 1639 iscsit_set_dataout_sequence_values(cmd); 1640 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1641 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1642 /* 1643 * Handle extra special case for out of order 1644 * Unsolicited Data Out. 1645 */ 1646 spin_lock_bh(&cmd->istate_lock); 1647 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1648 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1649 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1650 spin_unlock_bh(&cmd->istate_lock); 1651 1652 iscsit_stop_dataout_timer(cmd); 1653 if (ooo_cmdsn) 1654 return 0; 1655 target_execute_cmd(&cmd->se_cmd); 1656 return 0; 1657 } else /* DATAOUT_CANNOT_RECOVER */ 1658 return -1; 1659 1660 return 0; 1661 } 1662 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1663 1664 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1665 { 1666 struct iscsi_cmd *cmd = NULL; 1667 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1668 int rc; 1669 bool data_crc_failed = false; 1670 1671 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1672 if (rc < 0) 1673 return 0; 1674 else if (!cmd) 1675 return 0; 1676 1677 rc = iscsit_get_dataout(conn, cmd, hdr); 1678 if (rc < 0) 1679 return rc; 1680 else if (rc > 0) 1681 data_crc_failed = true; 1682 1683 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1684 } 1685 1686 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1687 struct iscsi_nopout *hdr) 1688 { 1689 u32 payload_length = ntoh24(hdr->dlength); 1690 1691 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1692 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1693 if (!cmd) 1694 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1695 (unsigned char *)hdr); 1696 1697 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1698 (unsigned char *)hdr); 1699 } 1700 1701 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1702 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1703 " not set, protocol error.\n"); 1704 if (!cmd) 1705 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1706 (unsigned char *)hdr); 1707 1708 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1709 (unsigned char *)hdr); 1710 } 1711 1712 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1713 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1714 " greater than MaxXmitDataSegmentLength: %u, protocol" 1715 " error.\n", payload_length, 1716 conn->conn_ops->MaxXmitDataSegmentLength); 1717 if (!cmd) 1718 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1719 (unsigned char *)hdr); 1720 1721 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1722 (unsigned char *)hdr); 1723 } 1724 1725 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1726 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1727 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1728 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1729 payload_length); 1730 /* 1731 * This is not a response to a Unsolicited NopIN, which means 1732 * it can either be a NOPOUT ping request (with a valid ITT), 1733 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1734 * Either way, make sure we allocate an struct iscsi_cmd, as both 1735 * can contain ping data. 1736 */ 1737 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1738 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1739 cmd->i_state = ISTATE_SEND_NOPIN; 1740 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1741 1 : 0); 1742 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1743 cmd->targ_xfer_tag = 0xFFFFFFFF; 1744 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1745 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1746 cmd->data_direction = DMA_NONE; 1747 } 1748 1749 return 0; 1750 } 1751 EXPORT_SYMBOL(iscsit_setup_nop_out); 1752 1753 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1754 struct iscsi_nopout *hdr) 1755 { 1756 struct iscsi_cmd *cmd_p = NULL; 1757 int cmdsn_ret = 0; 1758 /* 1759 * Initiator is expecting a NopIN ping reply.. 1760 */ 1761 if (hdr->itt != RESERVED_ITT) { 1762 if (!cmd) 1763 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1764 (unsigned char *)hdr); 1765 1766 spin_lock_bh(&conn->cmd_lock); 1767 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1768 spin_unlock_bh(&conn->cmd_lock); 1769 1770 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1771 1772 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1773 iscsit_add_cmd_to_response_queue(cmd, conn, 1774 cmd->i_state); 1775 return 0; 1776 } 1777 1778 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1779 (unsigned char *)hdr, hdr->cmdsn); 1780 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1781 return 0; 1782 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1783 return -1; 1784 1785 return 0; 1786 } 1787 /* 1788 * This was a response to a unsolicited NOPIN ping. 1789 */ 1790 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1791 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1792 if (!cmd_p) 1793 return -EINVAL; 1794 1795 iscsit_stop_nopin_response_timer(conn); 1796 1797 cmd_p->i_state = ISTATE_REMOVE; 1798 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1799 1800 iscsit_start_nopin_timer(conn); 1801 return 0; 1802 } 1803 /* 1804 * Otherwise, initiator is not expecting a NOPIN is response. 1805 * Just ignore for now. 1806 */ 1807 return 0; 1808 } 1809 EXPORT_SYMBOL(iscsit_process_nop_out); 1810 1811 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1812 unsigned char *buf) 1813 { 1814 unsigned char *ping_data = NULL; 1815 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1816 struct kvec *iov = NULL; 1817 u32 payload_length = ntoh24(hdr->dlength); 1818 int ret; 1819 1820 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1821 if (ret < 0) 1822 return 0; 1823 /* 1824 * Handle NOP-OUT payload for traditional iSCSI sockets 1825 */ 1826 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1827 u32 checksum, data_crc, padding = 0; 1828 int niov = 0, rx_got, rx_size = payload_length; 1829 1830 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1831 if (!ping_data) { 1832 pr_err("Unable to allocate memory for" 1833 " NOPOUT ping data.\n"); 1834 ret = -1; 1835 goto out; 1836 } 1837 1838 iov = &cmd->iov_misc[0]; 1839 iov[niov].iov_base = ping_data; 1840 iov[niov++].iov_len = payload_length; 1841 1842 padding = ((-payload_length) & 3); 1843 if (padding != 0) { 1844 pr_debug("Receiving %u additional bytes" 1845 " for padding.\n", padding); 1846 iov[niov].iov_base = &cmd->pad_bytes; 1847 iov[niov++].iov_len = padding; 1848 rx_size += padding; 1849 } 1850 if (conn->conn_ops->DataDigest) { 1851 iov[niov].iov_base = &checksum; 1852 iov[niov++].iov_len = ISCSI_CRC_LEN; 1853 rx_size += ISCSI_CRC_LEN; 1854 } 1855 1856 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1857 if (rx_got != rx_size) { 1858 ret = -1; 1859 goto out; 1860 } 1861 1862 if (conn->conn_ops->DataDigest) { 1863 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 1864 ping_data, payload_length, 1865 padding, cmd->pad_bytes, 1866 (u8 *)&data_crc); 1867 1868 if (checksum != data_crc) { 1869 pr_err("Ping data CRC32C DataDigest" 1870 " 0x%08x does not match computed 0x%08x\n", 1871 checksum, data_crc); 1872 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1873 pr_err("Unable to recover from" 1874 " NOPOUT Ping DataCRC failure while in" 1875 " ERL=0.\n"); 1876 ret = -1; 1877 goto out; 1878 } else { 1879 /* 1880 * Silently drop this PDU and let the 1881 * initiator plug the CmdSN gap. 1882 */ 1883 pr_debug("Dropping NOPOUT" 1884 " Command CmdSN: 0x%08x due to" 1885 " DataCRC error.\n", hdr->cmdsn); 1886 ret = 0; 1887 goto out; 1888 } 1889 } else { 1890 pr_debug("Got CRC32C DataDigest" 1891 " 0x%08x for %u bytes of ping data.\n", 1892 checksum, payload_length); 1893 } 1894 } 1895 1896 ping_data[payload_length] = '\0'; 1897 /* 1898 * Attach ping data to struct iscsi_cmd->buf_ptr. 1899 */ 1900 cmd->buf_ptr = ping_data; 1901 cmd->buf_ptr_size = payload_length; 1902 1903 pr_debug("Got %u bytes of NOPOUT ping" 1904 " data.\n", payload_length); 1905 pr_debug("Ping Data: \"%s\"\n", ping_data); 1906 } 1907 1908 return iscsit_process_nop_out(conn, cmd, hdr); 1909 out: 1910 if (cmd) 1911 iscsit_free_cmd(cmd, false); 1912 1913 kfree(ping_data); 1914 return ret; 1915 } 1916 1917 int 1918 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1919 unsigned char *buf) 1920 { 1921 struct se_tmr_req *se_tmr; 1922 struct iscsi_tmr_req *tmr_req; 1923 struct iscsi_tm *hdr; 1924 int out_of_order_cmdsn = 0, ret; 1925 bool sess_ref = false; 1926 u8 function; 1927 1928 hdr = (struct iscsi_tm *) buf; 1929 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1930 function = hdr->flags; 1931 1932 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1933 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1934 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1935 hdr->rtt, hdr->refcmdsn, conn->cid); 1936 1937 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1938 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1939 hdr->rtt != RESERVED_ITT)) { 1940 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1941 hdr->rtt = RESERVED_ITT; 1942 } 1943 1944 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1945 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1946 pr_err("Task Management Request TASK_REASSIGN not" 1947 " issued as immediate command, bad iSCSI Initiator" 1948 "implementation\n"); 1949 return iscsit_add_reject_cmd(cmd, 1950 ISCSI_REASON_PROTOCOL_ERROR, buf); 1951 } 1952 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1953 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1954 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1955 1956 cmd->data_direction = DMA_NONE; 1957 1958 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1959 if (!cmd->tmr_req) { 1960 pr_err("Unable to allocate memory for" 1961 " Task Management command!\n"); 1962 return iscsit_add_reject_cmd(cmd, 1963 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1964 buf); 1965 } 1966 1967 /* 1968 * TASK_REASSIGN for ERL=2 / connection stays inside of 1969 * LIO-Target $FABRIC_MOD 1970 */ 1971 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1972 1973 u8 tcm_function; 1974 int ret; 1975 1976 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1977 conn->sess->se_sess, 0, DMA_NONE, 1978 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 1979 1980 target_get_sess_cmd(&cmd->se_cmd, true); 1981 sess_ref = true; 1982 1983 switch (function) { 1984 case ISCSI_TM_FUNC_ABORT_TASK: 1985 tcm_function = TMR_ABORT_TASK; 1986 break; 1987 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1988 tcm_function = TMR_ABORT_TASK_SET; 1989 break; 1990 case ISCSI_TM_FUNC_CLEAR_ACA: 1991 tcm_function = TMR_CLEAR_ACA; 1992 break; 1993 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1994 tcm_function = TMR_CLEAR_TASK_SET; 1995 break; 1996 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1997 tcm_function = TMR_LUN_RESET; 1998 break; 1999 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2000 tcm_function = TMR_TARGET_WARM_RESET; 2001 break; 2002 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2003 tcm_function = TMR_TARGET_COLD_RESET; 2004 break; 2005 default: 2006 pr_err("Unknown iSCSI TMR Function:" 2007 " 0x%02x\n", function); 2008 return iscsit_add_reject_cmd(cmd, 2009 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2010 } 2011 2012 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 2013 tcm_function, GFP_KERNEL); 2014 if (ret < 0) 2015 return iscsit_add_reject_cmd(cmd, 2016 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2017 2018 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2019 } 2020 2021 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2022 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2023 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2024 cmd->init_task_tag = hdr->itt; 2025 cmd->targ_xfer_tag = 0xFFFFFFFF; 2026 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2027 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2028 se_tmr = cmd->se_cmd.se_tmr_req; 2029 tmr_req = cmd->tmr_req; 2030 /* 2031 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2032 */ 2033 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2034 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2035 scsilun_to_int(&hdr->lun)); 2036 if (ret < 0) { 2037 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2038 goto attach; 2039 } 2040 } 2041 2042 switch (function) { 2043 case ISCSI_TM_FUNC_ABORT_TASK: 2044 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2045 if (se_tmr->response) 2046 goto attach; 2047 break; 2048 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2049 case ISCSI_TM_FUNC_CLEAR_ACA: 2050 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2051 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2052 break; 2053 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2054 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2055 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2056 goto attach; 2057 } 2058 break; 2059 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2060 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2061 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2062 goto attach; 2063 } 2064 break; 2065 case ISCSI_TM_FUNC_TASK_REASSIGN: 2066 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2067 /* 2068 * Perform sanity checks on the ExpDataSN only if the 2069 * TASK_REASSIGN was successful. 2070 */ 2071 if (se_tmr->response) 2072 break; 2073 2074 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2075 return iscsit_add_reject_cmd(cmd, 2076 ISCSI_REASON_BOOKMARK_INVALID, buf); 2077 break; 2078 default: 2079 pr_err("Unknown TMR function: 0x%02x, protocol" 2080 " error.\n", function); 2081 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2082 goto attach; 2083 } 2084 2085 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2086 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2087 se_tmr->call_transport = 1; 2088 attach: 2089 spin_lock_bh(&conn->cmd_lock); 2090 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2091 spin_unlock_bh(&conn->cmd_lock); 2092 2093 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2094 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2095 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 2096 out_of_order_cmdsn = 1; 2097 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2098 return 0; 2099 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2100 return -1; 2101 } 2102 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2103 2104 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2105 return 0; 2106 /* 2107 * Found the referenced task, send to transport for processing. 2108 */ 2109 if (se_tmr->call_transport) 2110 return transport_generic_handle_tmr(&cmd->se_cmd); 2111 2112 /* 2113 * Could not find the referenced LUN, task, or Task Management 2114 * command not authorized or supported. Change state and 2115 * let the tx_thread send the response. 2116 * 2117 * For connection recovery, this is also the default action for 2118 * TMR TASK_REASSIGN. 2119 */ 2120 if (sess_ref) { 2121 pr_debug("Handle TMR, using sess_ref=true check\n"); 2122 target_put_sess_cmd(&cmd->se_cmd); 2123 } 2124 2125 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2126 return 0; 2127 } 2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2129 2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2131 int 2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2133 struct iscsi_text *hdr) 2134 { 2135 u32 payload_length = ntoh24(hdr->dlength); 2136 2137 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2138 pr_err("Unable to accept text parameter length: %u" 2139 "greater than MaxXmitDataSegmentLength %u.\n", 2140 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2141 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2142 (unsigned char *)hdr); 2143 } 2144 2145 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2146 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2147 pr_err("Multi sequence text commands currently not supported\n"); 2148 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2149 (unsigned char *)hdr); 2150 } 2151 2152 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2153 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2154 hdr->exp_statsn, payload_length); 2155 2156 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2157 cmd->i_state = ISTATE_SEND_TEXTRSP; 2158 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2159 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2160 cmd->targ_xfer_tag = 0xFFFFFFFF; 2161 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2162 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2163 cmd->data_direction = DMA_NONE; 2164 cmd->text_in_ptr = NULL; 2165 2166 return 0; 2167 } 2168 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2169 2170 int 2171 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2172 struct iscsi_text *hdr) 2173 { 2174 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2175 int cmdsn_ret; 2176 2177 if (!text_in) { 2178 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2179 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2180 pr_err("Unable to locate text_in buffer for sendtargets" 2181 " discovery\n"); 2182 goto reject; 2183 } 2184 goto empty_sendtargets; 2185 } 2186 if (strncmp("SendTargets", text_in, 11) != 0) { 2187 pr_err("Received Text Data that is not" 2188 " SendTargets, cannot continue.\n"); 2189 goto reject; 2190 } 2191 text_ptr = strchr(text_in, '='); 2192 if (!text_ptr) { 2193 pr_err("No \"=\" separator found in Text Data," 2194 " cannot continue.\n"); 2195 goto reject; 2196 } 2197 if (!strncmp("=All", text_ptr, 4)) { 2198 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2199 } else if (!strncmp("=iqn.", text_ptr, 5) || 2200 !strncmp("=eui.", text_ptr, 5)) { 2201 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2202 } else { 2203 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2204 goto reject; 2205 } 2206 2207 spin_lock_bh(&conn->cmd_lock); 2208 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2209 spin_unlock_bh(&conn->cmd_lock); 2210 2211 empty_sendtargets: 2212 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2213 2214 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2215 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2216 (unsigned char *)hdr, hdr->cmdsn); 2217 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2218 return -1; 2219 2220 return 0; 2221 } 2222 2223 return iscsit_execute_cmd(cmd, 0); 2224 2225 reject: 2226 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2227 (unsigned char *)hdr); 2228 } 2229 EXPORT_SYMBOL(iscsit_process_text_cmd); 2230 2231 static int 2232 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2233 unsigned char *buf) 2234 { 2235 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2236 char *text_in = NULL; 2237 u32 payload_length = ntoh24(hdr->dlength); 2238 int rx_size, rc; 2239 2240 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2241 if (rc < 0) 2242 return 0; 2243 2244 rx_size = payload_length; 2245 if (payload_length) { 2246 u32 checksum = 0, data_crc = 0; 2247 u32 padding = 0, pad_bytes = 0; 2248 int niov = 0, rx_got; 2249 struct kvec iov[3]; 2250 2251 text_in = kzalloc(payload_length, GFP_KERNEL); 2252 if (!text_in) { 2253 pr_err("Unable to allocate memory for" 2254 " incoming text parameters\n"); 2255 goto reject; 2256 } 2257 cmd->text_in_ptr = text_in; 2258 2259 memset(iov, 0, 3 * sizeof(struct kvec)); 2260 iov[niov].iov_base = text_in; 2261 iov[niov++].iov_len = payload_length; 2262 2263 padding = ((-payload_length) & 3); 2264 if (padding != 0) { 2265 iov[niov].iov_base = &pad_bytes; 2266 iov[niov++].iov_len = padding; 2267 rx_size += padding; 2268 pr_debug("Receiving %u additional bytes" 2269 " for padding.\n", padding); 2270 } 2271 if (conn->conn_ops->DataDigest) { 2272 iov[niov].iov_base = &checksum; 2273 iov[niov++].iov_len = ISCSI_CRC_LEN; 2274 rx_size += ISCSI_CRC_LEN; 2275 } 2276 2277 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2278 if (rx_got != rx_size) 2279 goto reject; 2280 2281 if (conn->conn_ops->DataDigest) { 2282 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2283 text_in, payload_length, 2284 padding, (u8 *)&pad_bytes, 2285 (u8 *)&data_crc); 2286 2287 if (checksum != data_crc) { 2288 pr_err("Text data CRC32C DataDigest" 2289 " 0x%08x does not match computed" 2290 " 0x%08x\n", checksum, data_crc); 2291 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2292 pr_err("Unable to recover from" 2293 " Text Data digest failure while in" 2294 " ERL=0.\n"); 2295 goto reject; 2296 } else { 2297 /* 2298 * Silently drop this PDU and let the 2299 * initiator plug the CmdSN gap. 2300 */ 2301 pr_debug("Dropping Text" 2302 " Command CmdSN: 0x%08x due to" 2303 " DataCRC error.\n", hdr->cmdsn); 2304 kfree(text_in); 2305 return 0; 2306 } 2307 } else { 2308 pr_debug("Got CRC32C DataDigest" 2309 " 0x%08x for %u bytes of text data.\n", 2310 checksum, payload_length); 2311 } 2312 } 2313 text_in[payload_length - 1] = '\0'; 2314 pr_debug("Successfully read %d bytes of text" 2315 " data.\n", payload_length); 2316 } 2317 2318 return iscsit_process_text_cmd(conn, cmd, hdr); 2319 2320 reject: 2321 kfree(cmd->text_in_ptr); 2322 cmd->text_in_ptr = NULL; 2323 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2324 } 2325 2326 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2327 { 2328 struct iscsi_conn *conn_p; 2329 struct iscsi_session *sess = conn->sess; 2330 2331 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2332 " for SID: %u.\n", conn->cid, conn->sess->sid); 2333 2334 atomic_set(&sess->session_logout, 1); 2335 atomic_set(&conn->conn_logout_remove, 1); 2336 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2337 2338 iscsit_inc_conn_usage_count(conn); 2339 iscsit_inc_session_usage_count(sess); 2340 2341 spin_lock_bh(&sess->conn_lock); 2342 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2343 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2344 continue; 2345 2346 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2347 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2348 } 2349 spin_unlock_bh(&sess->conn_lock); 2350 2351 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2352 2353 return 0; 2354 } 2355 2356 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2357 { 2358 struct iscsi_conn *l_conn; 2359 struct iscsi_session *sess = conn->sess; 2360 2361 pr_debug("Received logout request CLOSECONNECTION for CID:" 2362 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2363 2364 /* 2365 * A Logout Request with a CLOSECONNECTION reason code for a CID 2366 * can arrive on a connection with a differing CID. 2367 */ 2368 if (conn->cid == cmd->logout_cid) { 2369 spin_lock_bh(&conn->state_lock); 2370 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2371 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2372 2373 atomic_set(&conn->conn_logout_remove, 1); 2374 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2375 iscsit_inc_conn_usage_count(conn); 2376 2377 spin_unlock_bh(&conn->state_lock); 2378 } else { 2379 /* 2380 * Handle all different cid CLOSECONNECTION requests in 2381 * iscsit_logout_post_handler_diffcid() as to give enough 2382 * time for any non immediate command's CmdSN to be 2383 * acknowledged on the connection in question. 2384 * 2385 * Here we simply make sure the CID is still around. 2386 */ 2387 l_conn = iscsit_get_conn_from_cid(sess, 2388 cmd->logout_cid); 2389 if (!l_conn) { 2390 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2391 iscsit_add_cmd_to_response_queue(cmd, conn, 2392 cmd->i_state); 2393 return 0; 2394 } 2395 2396 iscsit_dec_conn_usage_count(l_conn); 2397 } 2398 2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2400 2401 return 0; 2402 } 2403 2404 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2405 { 2406 struct iscsi_session *sess = conn->sess; 2407 2408 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2409 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2410 2411 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2412 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2413 " while ERL!=2.\n"); 2414 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2415 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2416 return 0; 2417 } 2418 2419 if (conn->cid == cmd->logout_cid) { 2420 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2421 " with CID: %hu on CID: %hu, implementation error.\n", 2422 cmd->logout_cid, conn->cid); 2423 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2424 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2425 return 0; 2426 } 2427 2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2429 2430 return 0; 2431 } 2432 2433 int 2434 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2435 unsigned char *buf) 2436 { 2437 int cmdsn_ret, logout_remove = 0; 2438 u8 reason_code = 0; 2439 struct iscsi_logout *hdr; 2440 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2441 2442 hdr = (struct iscsi_logout *) buf; 2443 reason_code = (hdr->flags & 0x7f); 2444 2445 if (tiqn) { 2446 spin_lock(&tiqn->logout_stats.lock); 2447 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2448 tiqn->logout_stats.normal_logouts++; 2449 else 2450 tiqn->logout_stats.abnormal_logouts++; 2451 spin_unlock(&tiqn->logout_stats.lock); 2452 } 2453 2454 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2455 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2456 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2457 hdr->cid, conn->cid); 2458 2459 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2460 pr_err("Received logout request on connection that" 2461 " is not in logged in state, ignoring request.\n"); 2462 iscsit_free_cmd(cmd, false); 2463 return 0; 2464 } 2465 2466 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2467 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2468 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2469 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2470 cmd->targ_xfer_tag = 0xFFFFFFFF; 2471 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2472 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2473 cmd->logout_cid = be16_to_cpu(hdr->cid); 2474 cmd->logout_reason = reason_code; 2475 cmd->data_direction = DMA_NONE; 2476 2477 /* 2478 * We need to sleep in these cases (by returning 1) until the Logout 2479 * Response gets sent in the tx thread. 2480 */ 2481 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2482 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2483 be16_to_cpu(hdr->cid) == conn->cid)) 2484 logout_remove = 1; 2485 2486 spin_lock_bh(&conn->cmd_lock); 2487 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2488 spin_unlock_bh(&conn->cmd_lock); 2489 2490 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2491 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2492 2493 /* 2494 * Immediate commands are executed, well, immediately. 2495 * Non-Immediate Logout Commands are executed in CmdSN order. 2496 */ 2497 if (cmd->immediate_cmd) { 2498 int ret = iscsit_execute_cmd(cmd, 0); 2499 2500 if (ret < 0) 2501 return ret; 2502 } else { 2503 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2504 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2505 logout_remove = 0; 2506 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2507 return -1; 2508 } 2509 2510 return logout_remove; 2511 } 2512 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2513 2514 int iscsit_handle_snack( 2515 struct iscsi_conn *conn, 2516 unsigned char *buf) 2517 { 2518 struct iscsi_snack *hdr; 2519 2520 hdr = (struct iscsi_snack *) buf; 2521 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2522 2523 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2524 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2525 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2526 hdr->begrun, hdr->runlength, conn->cid); 2527 2528 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2529 pr_err("Initiator sent SNACK request while in" 2530 " ErrorRecoveryLevel=0.\n"); 2531 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2532 buf); 2533 } 2534 /* 2535 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2536 * call from inside iscsi_send_recovery_datain_or_r2t(). 2537 */ 2538 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2539 case 0: 2540 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2541 hdr->itt, 2542 be32_to_cpu(hdr->ttt), 2543 be32_to_cpu(hdr->begrun), 2544 be32_to_cpu(hdr->runlength)); 2545 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2546 return iscsit_handle_status_snack(conn, hdr->itt, 2547 be32_to_cpu(hdr->ttt), 2548 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2549 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2550 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2551 be32_to_cpu(hdr->begrun), 2552 be32_to_cpu(hdr->runlength)); 2553 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2554 /* FIXME: Support R-Data SNACK */ 2555 pr_err("R-Data SNACK Not Supported.\n"); 2556 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2557 buf); 2558 default: 2559 pr_err("Unknown SNACK type 0x%02x, protocol" 2560 " error.\n", hdr->flags & 0x0f); 2561 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2562 buf); 2563 } 2564 2565 return 0; 2566 } 2567 EXPORT_SYMBOL(iscsit_handle_snack); 2568 2569 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2570 { 2571 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2572 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2573 wait_for_completion_interruptible_timeout( 2574 &conn->rx_half_close_comp, 2575 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2576 } 2577 } 2578 2579 static int iscsit_handle_immediate_data( 2580 struct iscsi_cmd *cmd, 2581 struct iscsi_scsi_req *hdr, 2582 u32 length) 2583 { 2584 int iov_ret, rx_got = 0, rx_size = 0; 2585 u32 checksum, iov_count = 0, padding = 0; 2586 struct iscsi_conn *conn = cmd->conn; 2587 struct kvec *iov; 2588 2589 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2590 if (iov_ret < 0) 2591 return IMMEDIATE_DATA_CANNOT_RECOVER; 2592 2593 rx_size = length; 2594 iov_count = iov_ret; 2595 iov = &cmd->iov_data[0]; 2596 2597 padding = ((-length) & 3); 2598 if (padding != 0) { 2599 iov[iov_count].iov_base = cmd->pad_bytes; 2600 iov[iov_count++].iov_len = padding; 2601 rx_size += padding; 2602 } 2603 2604 if (conn->conn_ops->DataDigest) { 2605 iov[iov_count].iov_base = &checksum; 2606 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2607 rx_size += ISCSI_CRC_LEN; 2608 } 2609 2610 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2611 2612 iscsit_unmap_iovec(cmd); 2613 2614 if (rx_got != rx_size) { 2615 iscsit_rx_thread_wait_for_tcp(conn); 2616 return IMMEDIATE_DATA_CANNOT_RECOVER; 2617 } 2618 2619 if (conn->conn_ops->DataDigest) { 2620 u32 data_crc; 2621 2622 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2623 cmd->write_data_done, length, padding, 2624 cmd->pad_bytes); 2625 2626 if (checksum != data_crc) { 2627 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2628 " does not match computed 0x%08x\n", checksum, 2629 data_crc); 2630 2631 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2632 pr_err("Unable to recover from" 2633 " Immediate Data digest failure while" 2634 " in ERL=0.\n"); 2635 iscsit_reject_cmd(cmd, 2636 ISCSI_REASON_DATA_DIGEST_ERROR, 2637 (unsigned char *)hdr); 2638 return IMMEDIATE_DATA_CANNOT_RECOVER; 2639 } else { 2640 iscsit_reject_cmd(cmd, 2641 ISCSI_REASON_DATA_DIGEST_ERROR, 2642 (unsigned char *)hdr); 2643 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2644 } 2645 } else { 2646 pr_debug("Got CRC32C DataDigest 0x%08x for" 2647 " %u bytes of Immediate Data\n", checksum, 2648 length); 2649 } 2650 } 2651 2652 cmd->write_data_done += length; 2653 2654 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2655 spin_lock_bh(&cmd->istate_lock); 2656 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2657 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2658 spin_unlock_bh(&cmd->istate_lock); 2659 } 2660 2661 return IMMEDIATE_DATA_NORMAL_OPERATION; 2662 } 2663 2664 /* 2665 * Called with sess->conn_lock held. 2666 */ 2667 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2668 with active network interface */ 2669 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2670 { 2671 struct iscsi_cmd *cmd; 2672 struct iscsi_conn *conn_p; 2673 bool found = false; 2674 2675 /* 2676 * Only send a Asynchronous Message on connections whos network 2677 * interface is still functional. 2678 */ 2679 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2680 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2681 iscsit_inc_conn_usage_count(conn_p); 2682 found = true; 2683 break; 2684 } 2685 } 2686 2687 if (!found) 2688 return; 2689 2690 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2691 if (!cmd) { 2692 iscsit_dec_conn_usage_count(conn_p); 2693 return; 2694 } 2695 2696 cmd->logout_cid = conn->cid; 2697 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2698 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2699 2700 spin_lock_bh(&conn_p->cmd_lock); 2701 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2702 spin_unlock_bh(&conn_p->cmd_lock); 2703 2704 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2705 iscsit_dec_conn_usage_count(conn_p); 2706 } 2707 2708 static int iscsit_send_conn_drop_async_message( 2709 struct iscsi_cmd *cmd, 2710 struct iscsi_conn *conn) 2711 { 2712 struct iscsi_async *hdr; 2713 2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2715 2716 hdr = (struct iscsi_async *) cmd->pdu; 2717 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2718 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2719 cmd->init_task_tag = RESERVED_ITT; 2720 cmd->targ_xfer_tag = 0xFFFFFFFF; 2721 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2722 cmd->stat_sn = conn->stat_sn++; 2723 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2724 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2725 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2726 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2727 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2728 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2729 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2730 2731 pr_debug("Sending Connection Dropped Async Message StatSN:" 2732 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2733 cmd->logout_cid, conn->cid); 2734 2735 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2736 } 2737 2738 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2739 { 2740 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2741 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2742 wait_for_completion_interruptible_timeout( 2743 &conn->tx_half_close_comp, 2744 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2745 } 2746 } 2747 2748 void 2749 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2750 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2751 bool set_statsn) 2752 { 2753 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2754 hdr->flags = datain->flags; 2755 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2756 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2757 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2758 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2759 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2760 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2761 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2762 } 2763 } 2764 hton24(hdr->dlength, datain->length); 2765 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2766 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2767 (struct scsi_lun *)&hdr->lun); 2768 else 2769 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2770 2771 hdr->itt = cmd->init_task_tag; 2772 2773 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2774 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2775 else 2776 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2777 if (set_statsn) 2778 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2779 else 2780 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2781 2782 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2783 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2784 hdr->datasn = cpu_to_be32(datain->data_sn); 2785 hdr->offset = cpu_to_be32(datain->offset); 2786 2787 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2788 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2789 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2790 ntohl(hdr->offset), datain->length, conn->cid); 2791 } 2792 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2793 2794 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2795 { 2796 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2797 struct iscsi_datain datain; 2798 struct iscsi_datain_req *dr; 2799 int eodr = 0, ret; 2800 bool set_statsn = false; 2801 2802 memset(&datain, 0, sizeof(struct iscsi_datain)); 2803 dr = iscsit_get_datain_values(cmd, &datain); 2804 if (!dr) { 2805 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2806 cmd->init_task_tag); 2807 return -1; 2808 } 2809 /* 2810 * Be paranoid and double check the logic for now. 2811 */ 2812 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2813 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2814 " datain.length: %u exceeds cmd->data_length: %u\n", 2815 cmd->init_task_tag, datain.offset, datain.length, 2816 cmd->se_cmd.data_length); 2817 return -1; 2818 } 2819 2820 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2821 /* 2822 * Special case for successfully execution w/ both DATAIN 2823 * and Sense Data. 2824 */ 2825 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2826 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2827 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2828 else { 2829 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2830 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2831 iscsit_increment_maxcmdsn(cmd, conn->sess); 2832 cmd->stat_sn = conn->stat_sn++; 2833 set_statsn = true; 2834 } else if (dr->dr_complete == 2835 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2836 set_statsn = true; 2837 } 2838 2839 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2840 2841 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2842 if (ret < 0) 2843 return ret; 2844 2845 if (dr->dr_complete) { 2846 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2847 2 : 1; 2848 iscsit_free_datain_req(cmd, dr); 2849 } 2850 2851 return eodr; 2852 } 2853 2854 int 2855 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2856 struct iscsi_logout_rsp *hdr) 2857 { 2858 struct iscsi_conn *logout_conn = NULL; 2859 struct iscsi_conn_recovery *cr = NULL; 2860 struct iscsi_session *sess = conn->sess; 2861 /* 2862 * The actual shutting down of Sessions and/or Connections 2863 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2864 * is done in scsi_logout_post_handler(). 2865 */ 2866 switch (cmd->logout_reason) { 2867 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2868 pr_debug("iSCSI session logout successful, setting" 2869 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2870 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2871 break; 2872 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2873 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2874 break; 2875 /* 2876 * For CLOSECONNECTION logout requests carrying 2877 * a matching logout CID -> local CID, the reference 2878 * for the local CID will have been incremented in 2879 * iscsi_logout_closeconnection(). 2880 * 2881 * For CLOSECONNECTION logout requests carrying 2882 * a different CID than the connection it arrived 2883 * on, the connection responding to cmd->logout_cid 2884 * is stopped in iscsit_logout_post_handler_diffcid(). 2885 */ 2886 2887 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2888 " successful.\n", cmd->logout_cid, conn->cid); 2889 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2890 break; 2891 case ISCSI_LOGOUT_REASON_RECOVERY: 2892 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2893 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2894 break; 2895 /* 2896 * If the connection is still active from our point of view 2897 * force connection recovery to occur. 2898 */ 2899 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2900 cmd->logout_cid); 2901 if (logout_conn) { 2902 iscsit_connection_reinstatement_rcfr(logout_conn); 2903 iscsit_dec_conn_usage_count(logout_conn); 2904 } 2905 2906 cr = iscsit_get_inactive_connection_recovery_entry( 2907 conn->sess, cmd->logout_cid); 2908 if (!cr) { 2909 pr_err("Unable to locate CID: %hu for" 2910 " REMOVECONNFORRECOVERY Logout Request.\n", 2911 cmd->logout_cid); 2912 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2913 break; 2914 } 2915 2916 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2917 2918 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2919 " for recovery for CID: %hu on CID: %hu successful.\n", 2920 cmd->logout_cid, conn->cid); 2921 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2922 break; 2923 default: 2924 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2925 cmd->logout_reason); 2926 return -1; 2927 } 2928 2929 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2930 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2931 hdr->response = cmd->logout_response; 2932 hdr->itt = cmd->init_task_tag; 2933 cmd->stat_sn = conn->stat_sn++; 2934 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2935 2936 iscsit_increment_maxcmdsn(cmd, conn->sess); 2937 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2938 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2939 2940 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2941 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2942 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2943 cmd->logout_cid, conn->cid); 2944 2945 return 0; 2946 } 2947 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2948 2949 static int 2950 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2951 { 2952 int rc; 2953 2954 rc = iscsit_build_logout_rsp(cmd, conn, 2955 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2956 if (rc < 0) 2957 return rc; 2958 2959 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2960 } 2961 2962 void 2963 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2964 struct iscsi_nopin *hdr, bool nopout_response) 2965 { 2966 hdr->opcode = ISCSI_OP_NOOP_IN; 2967 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2968 hton24(hdr->dlength, cmd->buf_ptr_size); 2969 if (nopout_response) 2970 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2971 hdr->itt = cmd->init_task_tag; 2972 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2973 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2974 conn->stat_sn; 2975 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2976 2977 if (nopout_response) 2978 iscsit_increment_maxcmdsn(cmd, conn->sess); 2979 2980 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2981 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2982 2983 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2984 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2985 "Solicitied" : "Unsolicitied", cmd->init_task_tag, 2986 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2987 } 2988 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2989 2990 /* 2991 * Unsolicited NOPIN, either requesting a response or not. 2992 */ 2993 static int iscsit_send_unsolicited_nopin( 2994 struct iscsi_cmd *cmd, 2995 struct iscsi_conn *conn, 2996 int want_response) 2997 { 2998 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 2999 int ret; 3000 3001 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3002 3003 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3004 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3005 3006 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3007 if (ret < 0) 3008 return ret; 3009 3010 spin_lock_bh(&cmd->istate_lock); 3011 cmd->i_state = want_response ? 3012 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3013 spin_unlock_bh(&cmd->istate_lock); 3014 3015 return 0; 3016 } 3017 3018 static int 3019 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3020 { 3021 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3022 3023 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3024 3025 /* 3026 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3027 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3028 */ 3029 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3030 3031 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3032 cmd->buf_ptr, 3033 cmd->buf_ptr_size); 3034 } 3035 3036 static int iscsit_send_r2t( 3037 struct iscsi_cmd *cmd, 3038 struct iscsi_conn *conn) 3039 { 3040 struct iscsi_r2t *r2t; 3041 struct iscsi_r2t_rsp *hdr; 3042 int ret; 3043 3044 r2t = iscsit_get_r2t_from_list(cmd); 3045 if (!r2t) 3046 return -1; 3047 3048 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3049 memset(hdr, 0, ISCSI_HDR_LEN); 3050 hdr->opcode = ISCSI_OP_R2T; 3051 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3052 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3053 (struct scsi_lun *)&hdr->lun); 3054 hdr->itt = cmd->init_task_tag; 3055 if (conn->conn_transport->iscsit_get_r2t_ttt) 3056 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3057 else 3058 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3059 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3060 hdr->statsn = cpu_to_be32(conn->stat_sn); 3061 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3062 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3063 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3064 hdr->data_offset = cpu_to_be32(r2t->offset); 3065 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3066 3067 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3068 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3069 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3070 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3071 r2t->offset, r2t->xfer_len, conn->cid); 3072 3073 spin_lock_bh(&cmd->r2t_lock); 3074 r2t->sent_r2t = 1; 3075 spin_unlock_bh(&cmd->r2t_lock); 3076 3077 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3078 if (ret < 0) { 3079 return ret; 3080 } 3081 3082 spin_lock_bh(&cmd->dataout_timeout_lock); 3083 iscsit_start_dataout_timer(cmd, conn); 3084 spin_unlock_bh(&cmd->dataout_timeout_lock); 3085 3086 return 0; 3087 } 3088 3089 /* 3090 * @recovery: If called from iscsi_task_reassign_complete_write() for 3091 * connection recovery. 3092 */ 3093 int iscsit_build_r2ts_for_cmd( 3094 struct iscsi_conn *conn, 3095 struct iscsi_cmd *cmd, 3096 bool recovery) 3097 { 3098 int first_r2t = 1; 3099 u32 offset = 0, xfer_len = 0; 3100 3101 spin_lock_bh(&cmd->r2t_lock); 3102 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3103 spin_unlock_bh(&cmd->r2t_lock); 3104 return 0; 3105 } 3106 3107 if (conn->sess->sess_ops->DataSequenceInOrder && 3108 !recovery) 3109 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3110 3111 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3112 if (conn->sess->sess_ops->DataSequenceInOrder) { 3113 offset = cmd->r2t_offset; 3114 3115 if (first_r2t && recovery) { 3116 int new_data_end = offset + 3117 conn->sess->sess_ops->MaxBurstLength - 3118 cmd->next_burst_len; 3119 3120 if (new_data_end > cmd->se_cmd.data_length) 3121 xfer_len = cmd->se_cmd.data_length - offset; 3122 else 3123 xfer_len = 3124 conn->sess->sess_ops->MaxBurstLength - 3125 cmd->next_burst_len; 3126 } else { 3127 int new_data_end = offset + 3128 conn->sess->sess_ops->MaxBurstLength; 3129 3130 if (new_data_end > cmd->se_cmd.data_length) 3131 xfer_len = cmd->se_cmd.data_length - offset; 3132 else 3133 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3134 } 3135 cmd->r2t_offset += xfer_len; 3136 3137 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3138 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3139 } else { 3140 struct iscsi_seq *seq; 3141 3142 seq = iscsit_get_seq_holder_for_r2t(cmd); 3143 if (!seq) { 3144 spin_unlock_bh(&cmd->r2t_lock); 3145 return -1; 3146 } 3147 3148 offset = seq->offset; 3149 xfer_len = seq->xfer_len; 3150 3151 if (cmd->seq_send_order == cmd->seq_count) 3152 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3153 } 3154 cmd->outstanding_r2ts++; 3155 first_r2t = 0; 3156 3157 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3158 spin_unlock_bh(&cmd->r2t_lock); 3159 return -1; 3160 } 3161 3162 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3163 break; 3164 } 3165 spin_unlock_bh(&cmd->r2t_lock); 3166 3167 return 0; 3168 } 3169 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3170 3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3172 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3173 { 3174 if (inc_stat_sn) 3175 cmd->stat_sn = conn->stat_sn++; 3176 3177 atomic_long_inc(&conn->sess->rsp_pdus); 3178 3179 memset(hdr, 0, ISCSI_HDR_LEN); 3180 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3181 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3182 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3183 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3184 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3185 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3186 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3187 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3188 } 3189 hdr->response = cmd->iscsi_response; 3190 hdr->cmd_status = cmd->se_cmd.scsi_status; 3191 hdr->itt = cmd->init_task_tag; 3192 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3193 3194 iscsit_increment_maxcmdsn(cmd, conn->sess); 3195 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3196 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3197 3198 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3199 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3200 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3201 cmd->se_cmd.scsi_status, conn->cid); 3202 } 3203 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3204 3205 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3206 { 3207 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3208 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3209 void *data_buf = NULL; 3210 u32 padding = 0, data_buf_len = 0; 3211 3212 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3213 3214 /* 3215 * Attach SENSE DATA payload to iSCSI Response PDU 3216 */ 3217 if (cmd->se_cmd.sense_buffer && 3218 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3219 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3220 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3221 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3222 3223 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3224 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3225 data_buf = cmd->sense_buffer; 3226 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3227 3228 if (padding) { 3229 memset(cmd->sense_buffer + 3230 cmd->se_cmd.scsi_sense_length, 0, padding); 3231 pr_debug("Adding %u bytes of padding to" 3232 " SENSE.\n", padding); 3233 } 3234 3235 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3236 " Response PDU\n", 3237 cmd->se_cmd.scsi_sense_length); 3238 } 3239 3240 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3241 data_buf_len); 3242 } 3243 3244 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3245 { 3246 switch (se_tmr->response) { 3247 case TMR_FUNCTION_COMPLETE: 3248 return ISCSI_TMF_RSP_COMPLETE; 3249 case TMR_TASK_DOES_NOT_EXIST: 3250 return ISCSI_TMF_RSP_NO_TASK; 3251 case TMR_LUN_DOES_NOT_EXIST: 3252 return ISCSI_TMF_RSP_NO_LUN; 3253 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3254 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3255 case TMR_FUNCTION_REJECTED: 3256 default: 3257 return ISCSI_TMF_RSP_REJECTED; 3258 } 3259 } 3260 3261 void 3262 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3263 struct iscsi_tm_rsp *hdr) 3264 { 3265 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3266 3267 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3268 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3269 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3270 hdr->itt = cmd->init_task_tag; 3271 cmd->stat_sn = conn->stat_sn++; 3272 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3273 3274 iscsit_increment_maxcmdsn(cmd, conn->sess); 3275 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3276 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3277 3278 pr_debug("Built Task Management Response ITT: 0x%08x," 3279 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3280 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3281 } 3282 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3283 3284 static int 3285 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3286 { 3287 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3288 3289 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3290 3291 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3292 } 3293 3294 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3295 { 3296 bool ret = false; 3297 3298 if (np->np_sockaddr.ss_family == AF_INET6) { 3299 const struct sockaddr_in6 sin6 = { 3300 .sin6_addr = IN6ADDR_ANY_INIT }; 3301 struct sockaddr_in6 *sock_in6 = 3302 (struct sockaddr_in6 *)&np->np_sockaddr; 3303 3304 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3305 sin6.sin6_addr.s6_addr, 16)) 3306 ret = true; 3307 } else { 3308 struct sockaddr_in * sock_in = 3309 (struct sockaddr_in *)&np->np_sockaddr; 3310 3311 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3312 ret = true; 3313 } 3314 3315 return ret; 3316 } 3317 3318 #define SENDTARGETS_BUF_LIMIT 32768U 3319 3320 static int 3321 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3322 enum iscsit_transport_type network_transport, 3323 int skip_bytes, bool *completed) 3324 { 3325 char *payload = NULL; 3326 struct iscsi_conn *conn = cmd->conn; 3327 struct iscsi_portal_group *tpg; 3328 struct iscsi_tiqn *tiqn; 3329 struct iscsi_tpg_np *tpg_np; 3330 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3331 int target_name_printed; 3332 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3333 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3334 bool active; 3335 3336 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3337 SENDTARGETS_BUF_LIMIT); 3338 3339 payload = kzalloc(buffer_len, GFP_KERNEL); 3340 if (!payload) { 3341 pr_err("Unable to allocate memory for sendtargets" 3342 " response.\n"); 3343 return -ENOMEM; 3344 } 3345 /* 3346 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3347 * explicit case.. 3348 */ 3349 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3350 text_ptr = strchr(text_in, '='); 3351 if (!text_ptr) { 3352 pr_err("Unable to locate '=' string in text_in:" 3353 " %s\n", text_in); 3354 kfree(payload); 3355 return -EINVAL; 3356 } 3357 /* 3358 * Skip over '=' character.. 3359 */ 3360 text_ptr += 1; 3361 } 3362 3363 spin_lock(&tiqn_lock); 3364 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3365 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3366 strcmp(tiqn->tiqn, text_ptr)) { 3367 continue; 3368 } 3369 3370 target_name_printed = 0; 3371 3372 spin_lock(&tiqn->tiqn_tpg_lock); 3373 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3374 3375 /* If demo_mode_discovery=0 and generate_node_acls=0 3376 * (demo mode dislabed) do not return 3377 * TargetName+TargetAddress unless a NodeACL exists. 3378 */ 3379 3380 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3381 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3382 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3383 cmd->conn->sess->sess_ops->InitiatorName))) { 3384 continue; 3385 } 3386 3387 spin_lock(&tpg->tpg_state_lock); 3388 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3389 spin_unlock(&tpg->tpg_state_lock); 3390 3391 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3392 continue; 3393 3394 spin_lock(&tpg->tpg_np_lock); 3395 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3396 tpg_np_list) { 3397 struct iscsi_np *np = tpg_np->tpg_np; 3398 bool inaddr_any = iscsit_check_inaddr_any(np); 3399 struct sockaddr_storage *sockaddr; 3400 3401 if (np->np_network_transport != network_transport) 3402 continue; 3403 3404 if (!target_name_printed) { 3405 len = sprintf(buf, "TargetName=%s", 3406 tiqn->tiqn); 3407 len += 1; 3408 3409 if ((len + payload_len) > buffer_len) { 3410 spin_unlock(&tpg->tpg_np_lock); 3411 spin_unlock(&tiqn->tiqn_tpg_lock); 3412 end_of_buf = 1; 3413 goto eob; 3414 } 3415 3416 if (skip_bytes && len <= skip_bytes) { 3417 skip_bytes -= len; 3418 } else { 3419 memcpy(payload + payload_len, buf, len); 3420 payload_len += len; 3421 target_name_printed = 1; 3422 if (len > skip_bytes) 3423 skip_bytes = 0; 3424 } 3425 } 3426 3427 if (inaddr_any) 3428 sockaddr = &conn->local_sockaddr; 3429 else 3430 sockaddr = &np->np_sockaddr; 3431 3432 len = sprintf(buf, "TargetAddress=" 3433 "%pISpc,%hu", 3434 sockaddr, 3435 tpg->tpgt); 3436 len += 1; 3437 3438 if ((len + payload_len) > buffer_len) { 3439 spin_unlock(&tpg->tpg_np_lock); 3440 spin_unlock(&tiqn->tiqn_tpg_lock); 3441 end_of_buf = 1; 3442 goto eob; 3443 } 3444 3445 if (skip_bytes && len <= skip_bytes) { 3446 skip_bytes -= len; 3447 } else { 3448 memcpy(payload + payload_len, buf, len); 3449 payload_len += len; 3450 if (len > skip_bytes) 3451 skip_bytes = 0; 3452 } 3453 } 3454 spin_unlock(&tpg->tpg_np_lock); 3455 } 3456 spin_unlock(&tiqn->tiqn_tpg_lock); 3457 eob: 3458 if (end_of_buf) { 3459 *completed = false; 3460 break; 3461 } 3462 3463 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3464 break; 3465 } 3466 spin_unlock(&tiqn_lock); 3467 3468 cmd->buf_ptr = payload; 3469 3470 return payload_len; 3471 } 3472 3473 int 3474 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3475 struct iscsi_text_rsp *hdr, 3476 enum iscsit_transport_type network_transport) 3477 { 3478 int text_length, padding; 3479 bool completed = true; 3480 3481 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3482 cmd->read_data_done, 3483 &completed); 3484 if (text_length < 0) 3485 return text_length; 3486 3487 if (completed) { 3488 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3489 } else { 3490 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3491 cmd->read_data_done += text_length; 3492 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3493 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3494 } 3495 hdr->opcode = ISCSI_OP_TEXT_RSP; 3496 padding = ((-text_length) & 3); 3497 hton24(hdr->dlength, text_length); 3498 hdr->itt = cmd->init_task_tag; 3499 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3500 cmd->stat_sn = conn->stat_sn++; 3501 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3502 3503 iscsit_increment_maxcmdsn(cmd, conn->sess); 3504 /* 3505 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3506 * correctly increment MaxCmdSN for each response answering a 3507 * non immediate text request with a valid CmdSN. 3508 */ 3509 cmd->maxcmdsn_inc = 0; 3510 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3511 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3512 3513 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3514 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3515 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3516 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3517 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3518 3519 return text_length + padding; 3520 } 3521 EXPORT_SYMBOL(iscsit_build_text_rsp); 3522 3523 static int iscsit_send_text_rsp( 3524 struct iscsi_cmd *cmd, 3525 struct iscsi_conn *conn) 3526 { 3527 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3528 int text_length; 3529 3530 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3531 conn->conn_transport->transport_type); 3532 if (text_length < 0) 3533 return text_length; 3534 3535 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3536 cmd->buf_ptr, 3537 text_length); 3538 } 3539 3540 void 3541 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3542 struct iscsi_reject *hdr) 3543 { 3544 hdr->opcode = ISCSI_OP_REJECT; 3545 hdr->reason = cmd->reject_reason; 3546 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3547 hton24(hdr->dlength, ISCSI_HDR_LEN); 3548 hdr->ffffffff = cpu_to_be32(0xffffffff); 3549 cmd->stat_sn = conn->stat_sn++; 3550 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3551 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3552 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3553 3554 } 3555 EXPORT_SYMBOL(iscsit_build_reject); 3556 3557 static int iscsit_send_reject( 3558 struct iscsi_cmd *cmd, 3559 struct iscsi_conn *conn) 3560 { 3561 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3562 3563 iscsit_build_reject(cmd, conn, hdr); 3564 3565 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3566 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3567 3568 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3569 cmd->buf_ptr, 3570 ISCSI_HDR_LEN); 3571 } 3572 3573 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3574 { 3575 int ord, cpu; 3576 /* 3577 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3578 * within iscsit_start_kthreads() 3579 * 3580 * Here we use bitmap_id to determine which CPU that this 3581 * iSCSI connection's RX/TX threads will be scheduled to 3582 * execute upon. 3583 */ 3584 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3585 for_each_online_cpu(cpu) { 3586 if (ord-- == 0) { 3587 cpumask_set_cpu(cpu, conn->conn_cpumask); 3588 return; 3589 } 3590 } 3591 /* 3592 * This should never be reached.. 3593 */ 3594 dump_stack(); 3595 cpumask_setall(conn->conn_cpumask); 3596 } 3597 3598 int 3599 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3600 { 3601 int ret; 3602 3603 switch (state) { 3604 case ISTATE_SEND_R2T: 3605 ret = iscsit_send_r2t(cmd, conn); 3606 if (ret < 0) 3607 goto err; 3608 break; 3609 case ISTATE_REMOVE: 3610 spin_lock_bh(&conn->cmd_lock); 3611 list_del_init(&cmd->i_conn_node); 3612 spin_unlock_bh(&conn->cmd_lock); 3613 3614 iscsit_free_cmd(cmd, false); 3615 break; 3616 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3617 iscsit_mod_nopin_response_timer(conn); 3618 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3619 if (ret < 0) 3620 goto err; 3621 break; 3622 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3623 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3624 if (ret < 0) 3625 goto err; 3626 break; 3627 default: 3628 pr_err("Unknown Opcode: 0x%02x ITT:" 3629 " 0x%08x, i_state: %d on CID: %hu\n", 3630 cmd->iscsi_opcode, cmd->init_task_tag, state, 3631 conn->cid); 3632 goto err; 3633 } 3634 3635 return 0; 3636 3637 err: 3638 return -1; 3639 } 3640 EXPORT_SYMBOL(iscsit_immediate_queue); 3641 3642 static int 3643 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3644 { 3645 struct iscsit_transport *t = conn->conn_transport; 3646 struct iscsi_queue_req *qr; 3647 struct iscsi_cmd *cmd; 3648 u8 state; 3649 int ret; 3650 3651 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3652 atomic_set(&conn->check_immediate_queue, 0); 3653 cmd = qr->cmd; 3654 state = qr->state; 3655 kmem_cache_free(lio_qr_cache, qr); 3656 3657 ret = t->iscsit_immediate_queue(conn, cmd, state); 3658 if (ret < 0) 3659 return ret; 3660 } 3661 3662 return 0; 3663 } 3664 3665 int 3666 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3667 { 3668 int ret; 3669 3670 check_rsp_state: 3671 switch (state) { 3672 case ISTATE_SEND_DATAIN: 3673 ret = iscsit_send_datain(cmd, conn); 3674 if (ret < 0) 3675 goto err; 3676 else if (!ret) 3677 /* more drs */ 3678 goto check_rsp_state; 3679 else if (ret == 1) { 3680 /* all done */ 3681 spin_lock_bh(&cmd->istate_lock); 3682 cmd->i_state = ISTATE_SENT_STATUS; 3683 spin_unlock_bh(&cmd->istate_lock); 3684 3685 if (atomic_read(&conn->check_immediate_queue)) 3686 return 1; 3687 3688 return 0; 3689 } else if (ret == 2) { 3690 /* Still must send status, 3691 SCF_TRANSPORT_TASK_SENSE was set */ 3692 spin_lock_bh(&cmd->istate_lock); 3693 cmd->i_state = ISTATE_SEND_STATUS; 3694 spin_unlock_bh(&cmd->istate_lock); 3695 state = ISTATE_SEND_STATUS; 3696 goto check_rsp_state; 3697 } 3698 3699 break; 3700 case ISTATE_SEND_STATUS: 3701 case ISTATE_SEND_STATUS_RECOVERY: 3702 ret = iscsit_send_response(cmd, conn); 3703 break; 3704 case ISTATE_SEND_LOGOUTRSP: 3705 ret = iscsit_send_logout(cmd, conn); 3706 break; 3707 case ISTATE_SEND_ASYNCMSG: 3708 ret = iscsit_send_conn_drop_async_message( 3709 cmd, conn); 3710 break; 3711 case ISTATE_SEND_NOPIN: 3712 ret = iscsit_send_nopin(cmd, conn); 3713 break; 3714 case ISTATE_SEND_REJECT: 3715 ret = iscsit_send_reject(cmd, conn); 3716 break; 3717 case ISTATE_SEND_TASKMGTRSP: 3718 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3719 if (ret != 0) 3720 break; 3721 ret = iscsit_tmr_post_handler(cmd, conn); 3722 if (ret != 0) 3723 iscsit_fall_back_to_erl0(conn->sess); 3724 break; 3725 case ISTATE_SEND_TEXTRSP: 3726 ret = iscsit_send_text_rsp(cmd, conn); 3727 break; 3728 default: 3729 pr_err("Unknown Opcode: 0x%02x ITT:" 3730 " 0x%08x, i_state: %d on CID: %hu\n", 3731 cmd->iscsi_opcode, cmd->init_task_tag, 3732 state, conn->cid); 3733 goto err; 3734 } 3735 if (ret < 0) 3736 goto err; 3737 3738 switch (state) { 3739 case ISTATE_SEND_LOGOUTRSP: 3740 if (!iscsit_logout_post_handler(cmd, conn)) 3741 return -ECONNRESET; 3742 /* fall through */ 3743 case ISTATE_SEND_STATUS: 3744 case ISTATE_SEND_ASYNCMSG: 3745 case ISTATE_SEND_NOPIN: 3746 case ISTATE_SEND_STATUS_RECOVERY: 3747 case ISTATE_SEND_TEXTRSP: 3748 case ISTATE_SEND_TASKMGTRSP: 3749 case ISTATE_SEND_REJECT: 3750 spin_lock_bh(&cmd->istate_lock); 3751 cmd->i_state = ISTATE_SENT_STATUS; 3752 spin_unlock_bh(&cmd->istate_lock); 3753 break; 3754 default: 3755 pr_err("Unknown Opcode: 0x%02x ITT:" 3756 " 0x%08x, i_state: %d on CID: %hu\n", 3757 cmd->iscsi_opcode, cmd->init_task_tag, 3758 cmd->i_state, conn->cid); 3759 goto err; 3760 } 3761 3762 if (atomic_read(&conn->check_immediate_queue)) 3763 return 1; 3764 3765 return 0; 3766 3767 err: 3768 return -1; 3769 } 3770 EXPORT_SYMBOL(iscsit_response_queue); 3771 3772 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3773 { 3774 struct iscsit_transport *t = conn->conn_transport; 3775 struct iscsi_queue_req *qr; 3776 struct iscsi_cmd *cmd; 3777 u8 state; 3778 int ret; 3779 3780 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3781 cmd = qr->cmd; 3782 state = qr->state; 3783 kmem_cache_free(lio_qr_cache, qr); 3784 3785 ret = t->iscsit_response_queue(conn, cmd, state); 3786 if (ret == 1 || ret < 0) 3787 return ret; 3788 } 3789 3790 return 0; 3791 } 3792 3793 int iscsi_target_tx_thread(void *arg) 3794 { 3795 int ret = 0; 3796 struct iscsi_conn *conn = arg; 3797 /* 3798 * Allow ourselves to be interrupted by SIGINT so that a 3799 * connection recovery / failure event can be triggered externally. 3800 */ 3801 allow_signal(SIGINT); 3802 3803 while (!kthread_should_stop()) { 3804 /* 3805 * Ensure that both TX and RX per connection kthreads 3806 * are scheduled to run on the same CPU. 3807 */ 3808 iscsit_thread_check_cpumask(conn, current, 1); 3809 3810 wait_event_interruptible(conn->queues_wq, 3811 !iscsit_conn_all_queues_empty(conn)); 3812 3813 if (signal_pending(current)) 3814 goto transport_err; 3815 3816 get_immediate: 3817 ret = iscsit_handle_immediate_queue(conn); 3818 if (ret < 0) 3819 goto transport_err; 3820 3821 ret = iscsit_handle_response_queue(conn); 3822 if (ret == 1) 3823 goto get_immediate; 3824 else if (ret == -ECONNRESET) 3825 goto out; 3826 else if (ret < 0) 3827 goto transport_err; 3828 } 3829 3830 transport_err: 3831 /* 3832 * Avoid the normal connection failure code-path if this connection 3833 * is still within LOGIN mode, and iscsi_np process context is 3834 * responsible for cleaning up the early connection failure. 3835 */ 3836 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3837 iscsit_take_action_for_connection_exit(conn); 3838 out: 3839 return 0; 3840 } 3841 3842 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3843 { 3844 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3845 struct iscsi_cmd *cmd; 3846 int ret = 0; 3847 3848 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3849 case ISCSI_OP_SCSI_CMD: 3850 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3851 if (!cmd) 3852 goto reject; 3853 3854 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3855 break; 3856 case ISCSI_OP_SCSI_DATA_OUT: 3857 ret = iscsit_handle_data_out(conn, buf); 3858 break; 3859 case ISCSI_OP_NOOP_OUT: 3860 cmd = NULL; 3861 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3862 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3863 if (!cmd) 3864 goto reject; 3865 } 3866 ret = iscsit_handle_nop_out(conn, cmd, buf); 3867 break; 3868 case ISCSI_OP_SCSI_TMFUNC: 3869 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3870 if (!cmd) 3871 goto reject; 3872 3873 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3874 break; 3875 case ISCSI_OP_TEXT: 3876 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3877 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3878 if (!cmd) 3879 goto reject; 3880 } else { 3881 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3882 if (!cmd) 3883 goto reject; 3884 } 3885 3886 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3887 break; 3888 case ISCSI_OP_LOGOUT: 3889 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3890 if (!cmd) 3891 goto reject; 3892 3893 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3894 if (ret > 0) 3895 wait_for_completion_timeout(&conn->conn_logout_comp, 3896 SECONDS_FOR_LOGOUT_COMP * HZ); 3897 break; 3898 case ISCSI_OP_SNACK: 3899 ret = iscsit_handle_snack(conn, buf); 3900 break; 3901 default: 3902 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3903 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3904 pr_err("Cannot recover from unknown" 3905 " opcode while ERL=0, closing iSCSI connection.\n"); 3906 return -1; 3907 } 3908 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3909 " closing iSCSI connection.\n"); 3910 ret = -1; 3911 break; 3912 } 3913 3914 return ret; 3915 reject: 3916 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3917 } 3918 3919 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3920 { 3921 bool ret; 3922 3923 spin_lock_bh(&conn->state_lock); 3924 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3925 spin_unlock_bh(&conn->state_lock); 3926 3927 return ret; 3928 } 3929 3930 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3931 { 3932 int ret; 3933 u8 buffer[ISCSI_HDR_LEN], opcode; 3934 u32 checksum = 0, digest = 0; 3935 struct kvec iov; 3936 3937 while (!kthread_should_stop()) { 3938 /* 3939 * Ensure that both TX and RX per connection kthreads 3940 * are scheduled to run on the same CPU. 3941 */ 3942 iscsit_thread_check_cpumask(conn, current, 0); 3943 3944 memset(buffer, 0, ISCSI_HDR_LEN); 3945 memset(&iov, 0, sizeof(struct kvec)); 3946 3947 iov.iov_base = buffer; 3948 iov.iov_len = ISCSI_HDR_LEN; 3949 3950 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3951 if (ret != ISCSI_HDR_LEN) { 3952 iscsit_rx_thread_wait_for_tcp(conn); 3953 return; 3954 } 3955 3956 if (conn->conn_ops->HeaderDigest) { 3957 iov.iov_base = &digest; 3958 iov.iov_len = ISCSI_CRC_LEN; 3959 3960 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3961 if (ret != ISCSI_CRC_LEN) { 3962 iscsit_rx_thread_wait_for_tcp(conn); 3963 return; 3964 } 3965 3966 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 3967 buffer, ISCSI_HDR_LEN, 3968 0, NULL, (u8 *)&checksum); 3969 3970 if (digest != checksum) { 3971 pr_err("HeaderDigest CRC32C failed," 3972 " received 0x%08x, computed 0x%08x\n", 3973 digest, checksum); 3974 /* 3975 * Set the PDU to 0xff so it will intentionally 3976 * hit default in the switch below. 3977 */ 3978 memset(buffer, 0xff, ISCSI_HDR_LEN); 3979 atomic_long_inc(&conn->sess->conn_digest_errors); 3980 } else { 3981 pr_debug("Got HeaderDigest CRC32C" 3982 " 0x%08x\n", checksum); 3983 } 3984 } 3985 3986 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3987 return; 3988 3989 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3990 3991 if (conn->sess->sess_ops->SessionType && 3992 ((!(opcode & ISCSI_OP_TEXT)) || 3993 (!(opcode & ISCSI_OP_LOGOUT)))) { 3994 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3995 " while in Discovery Session, rejecting.\n", opcode); 3996 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 3997 buffer); 3998 return; 3999 } 4000 4001 ret = iscsi_target_rx_opcode(conn, buffer); 4002 if (ret < 0) 4003 return; 4004 } 4005 } 4006 4007 int iscsi_target_rx_thread(void *arg) 4008 { 4009 int rc; 4010 struct iscsi_conn *conn = arg; 4011 4012 /* 4013 * Allow ourselves to be interrupted by SIGINT so that a 4014 * connection recovery / failure event can be triggered externally. 4015 */ 4016 allow_signal(SIGINT); 4017 /* 4018 * Wait for iscsi_post_login_handler() to complete before allowing 4019 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4020 */ 4021 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4022 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4023 return 0; 4024 4025 if (!conn->conn_transport->iscsit_get_rx_pdu) 4026 return 0; 4027 4028 conn->conn_transport->iscsit_get_rx_pdu(conn); 4029 4030 if (!signal_pending(current)) 4031 atomic_set(&conn->transport_failed, 1); 4032 iscsit_take_action_for_connection_exit(conn); 4033 return 0; 4034 } 4035 4036 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4037 { 4038 LIST_HEAD(tmp_list); 4039 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4040 struct iscsi_session *sess = conn->sess; 4041 /* 4042 * We expect this function to only ever be called from either RX or TX 4043 * thread context via iscsit_close_connection() once the other context 4044 * has been reset -> returned sleeping pre-handler state. 4045 */ 4046 spin_lock_bh(&conn->cmd_lock); 4047 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4048 4049 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4050 struct se_cmd *se_cmd = &cmd->se_cmd; 4051 4052 if (se_cmd->se_tfo != NULL) { 4053 spin_lock(&se_cmd->t_state_lock); 4054 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4055 spin_unlock(&se_cmd->t_state_lock); 4056 } 4057 } 4058 spin_unlock_bh(&conn->cmd_lock); 4059 4060 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4061 list_del_init(&cmd->i_conn_node); 4062 4063 iscsit_increment_maxcmdsn(cmd, sess); 4064 iscsit_free_cmd(cmd, true); 4065 4066 } 4067 } 4068 4069 static void iscsit_stop_timers_for_cmds( 4070 struct iscsi_conn *conn) 4071 { 4072 struct iscsi_cmd *cmd; 4073 4074 spin_lock_bh(&conn->cmd_lock); 4075 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4076 if (cmd->data_direction == DMA_TO_DEVICE) 4077 iscsit_stop_dataout_timer(cmd); 4078 } 4079 spin_unlock_bh(&conn->cmd_lock); 4080 } 4081 4082 int iscsit_close_connection( 4083 struct iscsi_conn *conn) 4084 { 4085 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4086 struct iscsi_session *sess = conn->sess; 4087 4088 pr_debug("Closing iSCSI connection CID %hu on SID:" 4089 " %u\n", conn->cid, sess->sid); 4090 /* 4091 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4092 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4093 * sleeping and the logout response never got sent because the 4094 * connection failed. 4095 * 4096 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4097 * to signal logout response TX interrupt completion. Go ahead and skip 4098 * this for iser since isert_rx_opcode() does not wait on logout failure, 4099 * and to avoid iscsi_conn pointer dereference in iser-target code. 4100 */ 4101 if (!conn->conn_transport->rdma_shutdown) 4102 complete(&conn->conn_logout_comp); 4103 4104 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4105 if (conn->tx_thread && 4106 cmpxchg(&conn->tx_thread_active, true, false)) { 4107 send_sig(SIGINT, conn->tx_thread, 1); 4108 kthread_stop(conn->tx_thread); 4109 } 4110 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4111 if (conn->rx_thread && 4112 cmpxchg(&conn->rx_thread_active, true, false)) { 4113 send_sig(SIGINT, conn->rx_thread, 1); 4114 kthread_stop(conn->rx_thread); 4115 } 4116 } 4117 4118 spin_lock(&iscsit_global->ts_bitmap_lock); 4119 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4120 get_order(1)); 4121 spin_unlock(&iscsit_global->ts_bitmap_lock); 4122 4123 iscsit_stop_timers_for_cmds(conn); 4124 iscsit_stop_nopin_response_timer(conn); 4125 iscsit_stop_nopin_timer(conn); 4126 4127 if (conn->conn_transport->iscsit_wait_conn) 4128 conn->conn_transport->iscsit_wait_conn(conn); 4129 4130 /* 4131 * During Connection recovery drop unacknowledged out of order 4132 * commands for this connection, and prepare the other commands 4133 * for realligence. 4134 * 4135 * During normal operation clear the out of order commands (but 4136 * do not free the struct iscsi_ooo_cmdsn's) and release all 4137 * struct iscsi_cmds. 4138 */ 4139 if (atomic_read(&conn->connection_recovery)) { 4140 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4141 iscsit_prepare_cmds_for_realligance(conn); 4142 } else { 4143 iscsit_clear_ooo_cmdsns_for_conn(conn); 4144 iscsit_release_commands_from_conn(conn); 4145 } 4146 iscsit_free_queue_reqs_for_conn(conn); 4147 4148 /* 4149 * Handle decrementing session or connection usage count if 4150 * a logout response was not able to be sent because the 4151 * connection failed. Fall back to Session Recovery here. 4152 */ 4153 if (atomic_read(&conn->conn_logout_remove)) { 4154 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4155 iscsit_dec_conn_usage_count(conn); 4156 iscsit_dec_session_usage_count(sess); 4157 } 4158 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4159 iscsit_dec_conn_usage_count(conn); 4160 4161 atomic_set(&conn->conn_logout_remove, 0); 4162 atomic_set(&sess->session_reinstatement, 0); 4163 atomic_set(&sess->session_fall_back_to_erl0, 1); 4164 } 4165 4166 spin_lock_bh(&sess->conn_lock); 4167 list_del(&conn->conn_list); 4168 4169 /* 4170 * Attempt to let the Initiator know this connection failed by 4171 * sending an Connection Dropped Async Message on another 4172 * active connection. 4173 */ 4174 if (atomic_read(&conn->connection_recovery)) 4175 iscsit_build_conn_drop_async_message(conn); 4176 4177 spin_unlock_bh(&sess->conn_lock); 4178 4179 /* 4180 * If connection reinstatement is being performed on this connection, 4181 * up the connection reinstatement semaphore that is being blocked on 4182 * in iscsit_cause_connection_reinstatement(). 4183 */ 4184 spin_lock_bh(&conn->state_lock); 4185 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4186 spin_unlock_bh(&conn->state_lock); 4187 complete(&conn->conn_wait_comp); 4188 wait_for_completion(&conn->conn_post_wait_comp); 4189 spin_lock_bh(&conn->state_lock); 4190 } 4191 4192 /* 4193 * If connection reinstatement is being performed on this connection 4194 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4195 * connection wait rcfr semaphore that is being blocked on 4196 * an iscsit_connection_reinstatement_rcfr(). 4197 */ 4198 if (atomic_read(&conn->connection_wait_rcfr)) { 4199 spin_unlock_bh(&conn->state_lock); 4200 complete(&conn->conn_wait_rcfr_comp); 4201 wait_for_completion(&conn->conn_post_wait_comp); 4202 spin_lock_bh(&conn->state_lock); 4203 } 4204 atomic_set(&conn->connection_reinstatement, 1); 4205 spin_unlock_bh(&conn->state_lock); 4206 4207 /* 4208 * If any other processes are accessing this connection pointer we 4209 * must wait until they have completed. 4210 */ 4211 iscsit_check_conn_usage_count(conn); 4212 4213 ahash_request_free(conn->conn_tx_hash); 4214 if (conn->conn_rx_hash) { 4215 struct crypto_ahash *tfm; 4216 4217 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4218 ahash_request_free(conn->conn_rx_hash); 4219 crypto_free_ahash(tfm); 4220 } 4221 4222 free_cpumask_var(conn->conn_cpumask); 4223 4224 kfree(conn->conn_ops); 4225 conn->conn_ops = NULL; 4226 4227 if (conn->sock) 4228 sock_release(conn->sock); 4229 4230 if (conn->conn_transport->iscsit_free_conn) 4231 conn->conn_transport->iscsit_free_conn(conn); 4232 4233 iscsit_put_transport(conn->conn_transport); 4234 4235 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4236 conn->conn_state = TARG_CONN_STATE_FREE; 4237 kfree(conn); 4238 4239 spin_lock_bh(&sess->conn_lock); 4240 atomic_dec(&sess->nconn); 4241 pr_debug("Decremented iSCSI connection count to %hu from node:" 4242 " %s\n", atomic_read(&sess->nconn), 4243 sess->sess_ops->InitiatorName); 4244 /* 4245 * Make sure that if one connection fails in an non ERL=2 iSCSI 4246 * Session that they all fail. 4247 */ 4248 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4249 !atomic_read(&sess->session_logout)) 4250 atomic_set(&sess->session_fall_back_to_erl0, 1); 4251 4252 /* 4253 * If this was not the last connection in the session, and we are 4254 * performing session reinstatement or falling back to ERL=0, call 4255 * iscsit_stop_session() without sleeping to shutdown the other 4256 * active connections. 4257 */ 4258 if (atomic_read(&sess->nconn)) { 4259 if (!atomic_read(&sess->session_reinstatement) && 4260 !atomic_read(&sess->session_fall_back_to_erl0)) { 4261 spin_unlock_bh(&sess->conn_lock); 4262 return 0; 4263 } 4264 if (!atomic_read(&sess->session_stop_active)) { 4265 atomic_set(&sess->session_stop_active, 1); 4266 spin_unlock_bh(&sess->conn_lock); 4267 iscsit_stop_session(sess, 0, 0); 4268 return 0; 4269 } 4270 spin_unlock_bh(&sess->conn_lock); 4271 return 0; 4272 } 4273 4274 /* 4275 * If this was the last connection in the session and one of the 4276 * following is occurring: 4277 * 4278 * Session Reinstatement is not being performed, and are falling back 4279 * to ERL=0 call iscsit_close_session(). 4280 * 4281 * Session Logout was requested. iscsit_close_session() will be called 4282 * elsewhere. 4283 * 4284 * Session Continuation is not being performed, start the Time2Retain 4285 * handler and check if sleep_on_sess_wait_sem is active. 4286 */ 4287 if (!atomic_read(&sess->session_reinstatement) && 4288 atomic_read(&sess->session_fall_back_to_erl0)) { 4289 spin_unlock_bh(&sess->conn_lock); 4290 iscsit_close_session(sess); 4291 4292 return 0; 4293 } else if (atomic_read(&sess->session_logout)) { 4294 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4295 sess->session_state = TARG_SESS_STATE_FREE; 4296 spin_unlock_bh(&sess->conn_lock); 4297 4298 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4299 complete(&sess->session_wait_comp); 4300 4301 return 0; 4302 } else { 4303 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4304 sess->session_state = TARG_SESS_STATE_FAILED; 4305 4306 if (!atomic_read(&sess->session_continuation)) { 4307 spin_unlock_bh(&sess->conn_lock); 4308 iscsit_start_time2retain_handler(sess); 4309 } else 4310 spin_unlock_bh(&sess->conn_lock); 4311 4312 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4313 complete(&sess->session_wait_comp); 4314 4315 return 0; 4316 } 4317 } 4318 4319 /* 4320 * If the iSCSI Session for the iSCSI Initiator Node exists, 4321 * forcefully shutdown the iSCSI NEXUS. 4322 */ 4323 int iscsit_close_session(struct iscsi_session *sess) 4324 { 4325 struct iscsi_portal_group *tpg = sess->tpg; 4326 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4327 4328 if (atomic_read(&sess->nconn)) { 4329 pr_err("%d connection(s) still exist for iSCSI session" 4330 " to %s\n", atomic_read(&sess->nconn), 4331 sess->sess_ops->InitiatorName); 4332 BUG(); 4333 } 4334 4335 spin_lock_bh(&se_tpg->session_lock); 4336 atomic_set(&sess->session_logout, 1); 4337 atomic_set(&sess->session_reinstatement, 1); 4338 iscsit_stop_time2retain_timer(sess); 4339 spin_unlock_bh(&se_tpg->session_lock); 4340 4341 /* 4342 * transport_deregister_session_configfs() will clear the 4343 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4344 * can be setting it again with __transport_register_session() in 4345 * iscsi_post_login_handler() again after the iscsit_stop_session() 4346 * completes in iscsi_np context. 4347 */ 4348 transport_deregister_session_configfs(sess->se_sess); 4349 4350 /* 4351 * If any other processes are accessing this session pointer we must 4352 * wait until they have completed. If we are in an interrupt (the 4353 * time2retain handler) and contain and active session usage count we 4354 * restart the timer and exit. 4355 */ 4356 if (!in_interrupt()) { 4357 if (iscsit_check_session_usage_count(sess) == 1) 4358 iscsit_stop_session(sess, 1, 1); 4359 } else { 4360 if (iscsit_check_session_usage_count(sess) == 2) { 4361 atomic_set(&sess->session_logout, 0); 4362 iscsit_start_time2retain_handler(sess); 4363 return 0; 4364 } 4365 } 4366 4367 transport_deregister_session(sess->se_sess); 4368 4369 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4370 iscsit_free_connection_recovery_entires(sess); 4371 4372 iscsit_free_all_ooo_cmdsns(sess); 4373 4374 spin_lock_bh(&se_tpg->session_lock); 4375 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4376 sess->session_state = TARG_SESS_STATE_FREE; 4377 pr_debug("Released iSCSI session from node: %s\n", 4378 sess->sess_ops->InitiatorName); 4379 tpg->nsessions--; 4380 if (tpg->tpg_tiqn) 4381 tpg->tpg_tiqn->tiqn_nsessions--; 4382 4383 pr_debug("Decremented number of active iSCSI Sessions on" 4384 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4385 4386 spin_lock(&sess_idr_lock); 4387 idr_remove(&sess_idr, sess->session_index); 4388 spin_unlock(&sess_idr_lock); 4389 4390 kfree(sess->sess_ops); 4391 sess->sess_ops = NULL; 4392 spin_unlock_bh(&se_tpg->session_lock); 4393 4394 kfree(sess); 4395 return 0; 4396 } 4397 4398 static void iscsit_logout_post_handler_closesession( 4399 struct iscsi_conn *conn) 4400 { 4401 struct iscsi_session *sess = conn->sess; 4402 int sleep = 1; 4403 /* 4404 * Traditional iscsi/tcp will invoke this logic from TX thread 4405 * context during session logout, so clear tx_thread_active and 4406 * sleep if iscsit_close_connection() has not already occured. 4407 * 4408 * Since iser-target invokes this logic from it's own workqueue, 4409 * always sleep waiting for RX/TX thread shutdown to complete 4410 * within iscsit_close_connection(). 4411 */ 4412 if (!conn->conn_transport->rdma_shutdown) 4413 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4414 4415 atomic_set(&conn->conn_logout_remove, 0); 4416 complete(&conn->conn_logout_comp); 4417 4418 iscsit_dec_conn_usage_count(conn); 4419 iscsit_stop_session(sess, sleep, sleep); 4420 iscsit_dec_session_usage_count(sess); 4421 iscsit_close_session(sess); 4422 } 4423 4424 static void iscsit_logout_post_handler_samecid( 4425 struct iscsi_conn *conn) 4426 { 4427 int sleep = 1; 4428 4429 if (!conn->conn_transport->rdma_shutdown) 4430 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4431 4432 atomic_set(&conn->conn_logout_remove, 0); 4433 complete(&conn->conn_logout_comp); 4434 4435 iscsit_cause_connection_reinstatement(conn, sleep); 4436 iscsit_dec_conn_usage_count(conn); 4437 } 4438 4439 static void iscsit_logout_post_handler_diffcid( 4440 struct iscsi_conn *conn, 4441 u16 cid) 4442 { 4443 struct iscsi_conn *l_conn; 4444 struct iscsi_session *sess = conn->sess; 4445 bool conn_found = false; 4446 4447 if (!sess) 4448 return; 4449 4450 spin_lock_bh(&sess->conn_lock); 4451 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4452 if (l_conn->cid == cid) { 4453 iscsit_inc_conn_usage_count(l_conn); 4454 conn_found = true; 4455 break; 4456 } 4457 } 4458 spin_unlock_bh(&sess->conn_lock); 4459 4460 if (!conn_found) 4461 return; 4462 4463 if (l_conn->sock) 4464 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4465 4466 spin_lock_bh(&l_conn->state_lock); 4467 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4468 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4469 spin_unlock_bh(&l_conn->state_lock); 4470 4471 iscsit_cause_connection_reinstatement(l_conn, 1); 4472 iscsit_dec_conn_usage_count(l_conn); 4473 } 4474 4475 /* 4476 * Return of 0 causes the TX thread to restart. 4477 */ 4478 int iscsit_logout_post_handler( 4479 struct iscsi_cmd *cmd, 4480 struct iscsi_conn *conn) 4481 { 4482 int ret = 0; 4483 4484 switch (cmd->logout_reason) { 4485 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4486 switch (cmd->logout_response) { 4487 case ISCSI_LOGOUT_SUCCESS: 4488 case ISCSI_LOGOUT_CLEANUP_FAILED: 4489 default: 4490 iscsit_logout_post_handler_closesession(conn); 4491 break; 4492 } 4493 ret = 0; 4494 break; 4495 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4496 if (conn->cid == cmd->logout_cid) { 4497 switch (cmd->logout_response) { 4498 case ISCSI_LOGOUT_SUCCESS: 4499 case ISCSI_LOGOUT_CLEANUP_FAILED: 4500 default: 4501 iscsit_logout_post_handler_samecid(conn); 4502 break; 4503 } 4504 ret = 0; 4505 } else { 4506 switch (cmd->logout_response) { 4507 case ISCSI_LOGOUT_SUCCESS: 4508 iscsit_logout_post_handler_diffcid(conn, 4509 cmd->logout_cid); 4510 break; 4511 case ISCSI_LOGOUT_CID_NOT_FOUND: 4512 case ISCSI_LOGOUT_CLEANUP_FAILED: 4513 default: 4514 break; 4515 } 4516 ret = 1; 4517 } 4518 break; 4519 case ISCSI_LOGOUT_REASON_RECOVERY: 4520 switch (cmd->logout_response) { 4521 case ISCSI_LOGOUT_SUCCESS: 4522 case ISCSI_LOGOUT_CID_NOT_FOUND: 4523 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4524 case ISCSI_LOGOUT_CLEANUP_FAILED: 4525 default: 4526 break; 4527 } 4528 ret = 1; 4529 break; 4530 default: 4531 break; 4532 4533 } 4534 return ret; 4535 } 4536 EXPORT_SYMBOL(iscsit_logout_post_handler); 4537 4538 void iscsit_fail_session(struct iscsi_session *sess) 4539 { 4540 struct iscsi_conn *conn; 4541 4542 spin_lock_bh(&sess->conn_lock); 4543 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4544 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4545 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4546 } 4547 spin_unlock_bh(&sess->conn_lock); 4548 4549 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4550 sess->session_state = TARG_SESS_STATE_FAILED; 4551 } 4552 4553 int iscsit_free_session(struct iscsi_session *sess) 4554 { 4555 u16 conn_count = atomic_read(&sess->nconn); 4556 struct iscsi_conn *conn, *conn_tmp = NULL; 4557 int is_last; 4558 4559 spin_lock_bh(&sess->conn_lock); 4560 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4561 4562 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4563 conn_list) { 4564 if (conn_count == 0) 4565 break; 4566 4567 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4568 is_last = 1; 4569 } else { 4570 iscsit_inc_conn_usage_count(conn_tmp); 4571 is_last = 0; 4572 } 4573 iscsit_inc_conn_usage_count(conn); 4574 4575 spin_unlock_bh(&sess->conn_lock); 4576 iscsit_cause_connection_reinstatement(conn, 1); 4577 spin_lock_bh(&sess->conn_lock); 4578 4579 iscsit_dec_conn_usage_count(conn); 4580 if (is_last == 0) 4581 iscsit_dec_conn_usage_count(conn_tmp); 4582 4583 conn_count--; 4584 } 4585 4586 if (atomic_read(&sess->nconn)) { 4587 spin_unlock_bh(&sess->conn_lock); 4588 wait_for_completion(&sess->session_wait_comp); 4589 } else 4590 spin_unlock_bh(&sess->conn_lock); 4591 4592 iscsit_close_session(sess); 4593 return 0; 4594 } 4595 4596 void iscsit_stop_session( 4597 struct iscsi_session *sess, 4598 int session_sleep, 4599 int connection_sleep) 4600 { 4601 u16 conn_count = atomic_read(&sess->nconn); 4602 struct iscsi_conn *conn, *conn_tmp = NULL; 4603 int is_last; 4604 4605 spin_lock_bh(&sess->conn_lock); 4606 if (session_sleep) 4607 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4608 4609 if (connection_sleep) { 4610 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4611 conn_list) { 4612 if (conn_count == 0) 4613 break; 4614 4615 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4616 is_last = 1; 4617 } else { 4618 iscsit_inc_conn_usage_count(conn_tmp); 4619 is_last = 0; 4620 } 4621 iscsit_inc_conn_usage_count(conn); 4622 4623 spin_unlock_bh(&sess->conn_lock); 4624 iscsit_cause_connection_reinstatement(conn, 1); 4625 spin_lock_bh(&sess->conn_lock); 4626 4627 iscsit_dec_conn_usage_count(conn); 4628 if (is_last == 0) 4629 iscsit_dec_conn_usage_count(conn_tmp); 4630 conn_count--; 4631 } 4632 } else { 4633 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4634 iscsit_cause_connection_reinstatement(conn, 0); 4635 } 4636 4637 if (session_sleep && atomic_read(&sess->nconn)) { 4638 spin_unlock_bh(&sess->conn_lock); 4639 wait_for_completion(&sess->session_wait_comp); 4640 } else 4641 spin_unlock_bh(&sess->conn_lock); 4642 } 4643 4644 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4645 { 4646 struct iscsi_session *sess; 4647 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4648 struct se_session *se_sess, *se_sess_tmp; 4649 LIST_HEAD(free_list); 4650 int session_count = 0; 4651 4652 spin_lock_bh(&se_tpg->session_lock); 4653 if (tpg->nsessions && !force) { 4654 spin_unlock_bh(&se_tpg->session_lock); 4655 return -1; 4656 } 4657 4658 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4659 sess_list) { 4660 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4661 4662 spin_lock(&sess->conn_lock); 4663 if (atomic_read(&sess->session_fall_back_to_erl0) || 4664 atomic_read(&sess->session_logout) || 4665 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4666 spin_unlock(&sess->conn_lock); 4667 continue; 4668 } 4669 atomic_set(&sess->session_reinstatement, 1); 4670 spin_unlock(&sess->conn_lock); 4671 4672 list_move_tail(&se_sess->sess_list, &free_list); 4673 } 4674 spin_unlock_bh(&se_tpg->session_lock); 4675 4676 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4678 4679 iscsit_free_session(sess); 4680 session_count++; 4681 } 4682 4683 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4684 " Group: %hu\n", session_count, tpg->tpgt); 4685 return 0; 4686 } 4687 4688 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4689 MODULE_VERSION("4.1.x"); 4690 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4691 MODULE_LICENSE("GPL"); 4692 4693 module_init(iscsi_target_init_module); 4694 module_exit(iscsi_target_cleanup_module); 4695