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 1808 if (cmd) 1809 iscsit_free_cmd(cmd, false); 1810 1811 return 0; 1812 } 1813 EXPORT_SYMBOL(iscsit_process_nop_out); 1814 1815 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1816 unsigned char *buf) 1817 { 1818 unsigned char *ping_data = NULL; 1819 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1820 struct kvec *iov = NULL; 1821 u32 payload_length = ntoh24(hdr->dlength); 1822 int ret; 1823 1824 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1825 if (ret < 0) 1826 return 0; 1827 /* 1828 * Handle NOP-OUT payload for traditional iSCSI sockets 1829 */ 1830 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1831 u32 checksum, data_crc, padding = 0; 1832 int niov = 0, rx_got, rx_size = payload_length; 1833 1834 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1835 if (!ping_data) { 1836 pr_err("Unable to allocate memory for" 1837 " NOPOUT ping data.\n"); 1838 ret = -1; 1839 goto out; 1840 } 1841 1842 iov = &cmd->iov_misc[0]; 1843 iov[niov].iov_base = ping_data; 1844 iov[niov++].iov_len = payload_length; 1845 1846 padding = ((-payload_length) & 3); 1847 if (padding != 0) { 1848 pr_debug("Receiving %u additional bytes" 1849 " for padding.\n", padding); 1850 iov[niov].iov_base = &cmd->pad_bytes; 1851 iov[niov++].iov_len = padding; 1852 rx_size += padding; 1853 } 1854 if (conn->conn_ops->DataDigest) { 1855 iov[niov].iov_base = &checksum; 1856 iov[niov++].iov_len = ISCSI_CRC_LEN; 1857 rx_size += ISCSI_CRC_LEN; 1858 } 1859 1860 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1861 if (rx_got != rx_size) { 1862 ret = -1; 1863 goto out; 1864 } 1865 1866 if (conn->conn_ops->DataDigest) { 1867 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 1868 ping_data, payload_length, 1869 padding, cmd->pad_bytes, 1870 (u8 *)&data_crc); 1871 1872 if (checksum != data_crc) { 1873 pr_err("Ping data CRC32C DataDigest" 1874 " 0x%08x does not match computed 0x%08x\n", 1875 checksum, data_crc); 1876 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1877 pr_err("Unable to recover from" 1878 " NOPOUT Ping DataCRC failure while in" 1879 " ERL=0.\n"); 1880 ret = -1; 1881 goto out; 1882 } else { 1883 /* 1884 * Silently drop this PDU and let the 1885 * initiator plug the CmdSN gap. 1886 */ 1887 pr_debug("Dropping NOPOUT" 1888 " Command CmdSN: 0x%08x due to" 1889 " DataCRC error.\n", hdr->cmdsn); 1890 ret = 0; 1891 goto out; 1892 } 1893 } else { 1894 pr_debug("Got CRC32C DataDigest" 1895 " 0x%08x for %u bytes of ping data.\n", 1896 checksum, payload_length); 1897 } 1898 } 1899 1900 ping_data[payload_length] = '\0'; 1901 /* 1902 * Attach ping data to struct iscsi_cmd->buf_ptr. 1903 */ 1904 cmd->buf_ptr = ping_data; 1905 cmd->buf_ptr_size = payload_length; 1906 1907 pr_debug("Got %u bytes of NOPOUT ping" 1908 " data.\n", payload_length); 1909 pr_debug("Ping Data: \"%s\"\n", ping_data); 1910 } 1911 1912 return iscsit_process_nop_out(conn, cmd, hdr); 1913 out: 1914 if (cmd) 1915 iscsit_free_cmd(cmd, false); 1916 1917 kfree(ping_data); 1918 return ret; 1919 } 1920 1921 int 1922 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1923 unsigned char *buf) 1924 { 1925 struct se_tmr_req *se_tmr; 1926 struct iscsi_tmr_req *tmr_req; 1927 struct iscsi_tm *hdr; 1928 int out_of_order_cmdsn = 0, ret; 1929 bool sess_ref = false; 1930 u8 function; 1931 1932 hdr = (struct iscsi_tm *) buf; 1933 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1934 function = hdr->flags; 1935 1936 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1937 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1938 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1939 hdr->rtt, hdr->refcmdsn, conn->cid); 1940 1941 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1942 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1943 hdr->rtt != RESERVED_ITT)) { 1944 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1945 hdr->rtt = RESERVED_ITT; 1946 } 1947 1948 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1949 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1950 pr_err("Task Management Request TASK_REASSIGN not" 1951 " issued as immediate command, bad iSCSI Initiator" 1952 "implementation\n"); 1953 return iscsit_add_reject_cmd(cmd, 1954 ISCSI_REASON_PROTOCOL_ERROR, buf); 1955 } 1956 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1957 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1958 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1959 1960 cmd->data_direction = DMA_NONE; 1961 1962 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 1963 if (!cmd->tmr_req) { 1964 pr_err("Unable to allocate memory for" 1965 " Task Management command!\n"); 1966 return iscsit_add_reject_cmd(cmd, 1967 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1968 buf); 1969 } 1970 1971 /* 1972 * TASK_REASSIGN for ERL=2 / connection stays inside of 1973 * LIO-Target $FABRIC_MOD 1974 */ 1975 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 1976 1977 u8 tcm_function; 1978 int ret; 1979 1980 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1981 conn->sess->se_sess, 0, DMA_NONE, 1982 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 1983 1984 target_get_sess_cmd(&cmd->se_cmd, true); 1985 sess_ref = true; 1986 1987 switch (function) { 1988 case ISCSI_TM_FUNC_ABORT_TASK: 1989 tcm_function = TMR_ABORT_TASK; 1990 break; 1991 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1992 tcm_function = TMR_ABORT_TASK_SET; 1993 break; 1994 case ISCSI_TM_FUNC_CLEAR_ACA: 1995 tcm_function = TMR_CLEAR_ACA; 1996 break; 1997 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1998 tcm_function = TMR_CLEAR_TASK_SET; 1999 break; 2000 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2001 tcm_function = TMR_LUN_RESET; 2002 break; 2003 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2004 tcm_function = TMR_TARGET_WARM_RESET; 2005 break; 2006 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2007 tcm_function = TMR_TARGET_COLD_RESET; 2008 break; 2009 default: 2010 pr_err("Unknown iSCSI TMR Function:" 2011 " 0x%02x\n", function); 2012 return iscsit_add_reject_cmd(cmd, 2013 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2014 } 2015 2016 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, 2017 tcm_function, GFP_KERNEL); 2018 if (ret < 0) 2019 return iscsit_add_reject_cmd(cmd, 2020 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2021 2022 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2023 } 2024 2025 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2026 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2027 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2028 cmd->init_task_tag = hdr->itt; 2029 cmd->targ_xfer_tag = 0xFFFFFFFF; 2030 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2031 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2032 se_tmr = cmd->se_cmd.se_tmr_req; 2033 tmr_req = cmd->tmr_req; 2034 /* 2035 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2036 */ 2037 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2038 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2039 scsilun_to_int(&hdr->lun)); 2040 if (ret < 0) { 2041 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2042 goto attach; 2043 } 2044 } 2045 2046 switch (function) { 2047 case ISCSI_TM_FUNC_ABORT_TASK: 2048 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2049 if (se_tmr->response) 2050 goto attach; 2051 break; 2052 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2053 case ISCSI_TM_FUNC_CLEAR_ACA: 2054 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2055 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2056 break; 2057 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2058 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2059 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2060 goto attach; 2061 } 2062 break; 2063 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2064 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2065 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2066 goto attach; 2067 } 2068 break; 2069 case ISCSI_TM_FUNC_TASK_REASSIGN: 2070 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2071 /* 2072 * Perform sanity checks on the ExpDataSN only if the 2073 * TASK_REASSIGN was successful. 2074 */ 2075 if (se_tmr->response) 2076 break; 2077 2078 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2079 return iscsit_add_reject_cmd(cmd, 2080 ISCSI_REASON_BOOKMARK_INVALID, buf); 2081 break; 2082 default: 2083 pr_err("Unknown TMR function: 0x%02x, protocol" 2084 " error.\n", function); 2085 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2086 goto attach; 2087 } 2088 2089 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2090 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2091 se_tmr->call_transport = 1; 2092 attach: 2093 spin_lock_bh(&conn->cmd_lock); 2094 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2095 spin_unlock_bh(&conn->cmd_lock); 2096 2097 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2098 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2099 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 2100 out_of_order_cmdsn = 1; 2101 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2102 return 0; 2103 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2104 return -1; 2105 } 2106 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2107 2108 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2109 return 0; 2110 /* 2111 * Found the referenced task, send to transport for processing. 2112 */ 2113 if (se_tmr->call_transport) 2114 return transport_generic_handle_tmr(&cmd->se_cmd); 2115 2116 /* 2117 * Could not find the referenced LUN, task, or Task Management 2118 * command not authorized or supported. Change state and 2119 * let the tx_thread send the response. 2120 * 2121 * For connection recovery, this is also the default action for 2122 * TMR TASK_REASSIGN. 2123 */ 2124 if (sess_ref) { 2125 pr_debug("Handle TMR, using sess_ref=true check\n"); 2126 target_put_sess_cmd(&cmd->se_cmd); 2127 } 2128 2129 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2130 return 0; 2131 } 2132 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2133 2134 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2135 int 2136 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2137 struct iscsi_text *hdr) 2138 { 2139 u32 payload_length = ntoh24(hdr->dlength); 2140 2141 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2142 pr_err("Unable to accept text parameter length: %u" 2143 "greater than MaxXmitDataSegmentLength %u.\n", 2144 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2145 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2146 (unsigned char *)hdr); 2147 } 2148 2149 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2150 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2151 pr_err("Multi sequence text commands currently not supported\n"); 2152 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2153 (unsigned char *)hdr); 2154 } 2155 2156 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2157 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2158 hdr->exp_statsn, payload_length); 2159 2160 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2161 cmd->i_state = ISTATE_SEND_TEXTRSP; 2162 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2163 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2164 cmd->targ_xfer_tag = 0xFFFFFFFF; 2165 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2166 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2167 cmd->data_direction = DMA_NONE; 2168 cmd->text_in_ptr = NULL; 2169 2170 return 0; 2171 } 2172 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2173 2174 int 2175 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2176 struct iscsi_text *hdr) 2177 { 2178 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2179 int cmdsn_ret; 2180 2181 if (!text_in) { 2182 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2183 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2184 pr_err("Unable to locate text_in buffer for sendtargets" 2185 " discovery\n"); 2186 goto reject; 2187 } 2188 goto empty_sendtargets; 2189 } 2190 if (strncmp("SendTargets", text_in, 11) != 0) { 2191 pr_err("Received Text Data that is not" 2192 " SendTargets, cannot continue.\n"); 2193 goto reject; 2194 } 2195 text_ptr = strchr(text_in, '='); 2196 if (!text_ptr) { 2197 pr_err("No \"=\" separator found in Text Data," 2198 " cannot continue.\n"); 2199 goto reject; 2200 } 2201 if (!strncmp("=All", text_ptr, 4)) { 2202 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2203 } else if (!strncmp("=iqn.", text_ptr, 5) || 2204 !strncmp("=eui.", text_ptr, 5)) { 2205 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2206 } else { 2207 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2208 goto reject; 2209 } 2210 2211 spin_lock_bh(&conn->cmd_lock); 2212 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2213 spin_unlock_bh(&conn->cmd_lock); 2214 2215 empty_sendtargets: 2216 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2217 2218 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2219 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2220 (unsigned char *)hdr, hdr->cmdsn); 2221 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2222 return -1; 2223 2224 return 0; 2225 } 2226 2227 return iscsit_execute_cmd(cmd, 0); 2228 2229 reject: 2230 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2231 (unsigned char *)hdr); 2232 } 2233 EXPORT_SYMBOL(iscsit_process_text_cmd); 2234 2235 static int 2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2237 unsigned char *buf) 2238 { 2239 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2240 char *text_in = NULL; 2241 u32 payload_length = ntoh24(hdr->dlength); 2242 int rx_size, rc; 2243 2244 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2245 if (rc < 0) 2246 return 0; 2247 2248 rx_size = payload_length; 2249 if (payload_length) { 2250 u32 checksum = 0, data_crc = 0; 2251 u32 padding = 0, pad_bytes = 0; 2252 int niov = 0, rx_got; 2253 struct kvec iov[3]; 2254 2255 text_in = kzalloc(payload_length, GFP_KERNEL); 2256 if (!text_in) { 2257 pr_err("Unable to allocate memory for" 2258 " incoming text parameters\n"); 2259 goto reject; 2260 } 2261 cmd->text_in_ptr = text_in; 2262 2263 memset(iov, 0, 3 * sizeof(struct kvec)); 2264 iov[niov].iov_base = text_in; 2265 iov[niov++].iov_len = payload_length; 2266 2267 padding = ((-payload_length) & 3); 2268 if (padding != 0) { 2269 iov[niov].iov_base = &pad_bytes; 2270 iov[niov++].iov_len = padding; 2271 rx_size += padding; 2272 pr_debug("Receiving %u additional bytes" 2273 " for padding.\n", padding); 2274 } 2275 if (conn->conn_ops->DataDigest) { 2276 iov[niov].iov_base = &checksum; 2277 iov[niov++].iov_len = ISCSI_CRC_LEN; 2278 rx_size += ISCSI_CRC_LEN; 2279 } 2280 2281 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2282 if (rx_got != rx_size) 2283 goto reject; 2284 2285 if (conn->conn_ops->DataDigest) { 2286 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2287 text_in, payload_length, 2288 padding, (u8 *)&pad_bytes, 2289 (u8 *)&data_crc); 2290 2291 if (checksum != data_crc) { 2292 pr_err("Text data CRC32C DataDigest" 2293 " 0x%08x does not match computed" 2294 " 0x%08x\n", checksum, data_crc); 2295 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2296 pr_err("Unable to recover from" 2297 " Text Data digest failure while in" 2298 " ERL=0.\n"); 2299 goto reject; 2300 } else { 2301 /* 2302 * Silently drop this PDU and let the 2303 * initiator plug the CmdSN gap. 2304 */ 2305 pr_debug("Dropping Text" 2306 " Command CmdSN: 0x%08x due to" 2307 " DataCRC error.\n", hdr->cmdsn); 2308 kfree(text_in); 2309 return 0; 2310 } 2311 } else { 2312 pr_debug("Got CRC32C DataDigest" 2313 " 0x%08x for %u bytes of text data.\n", 2314 checksum, payload_length); 2315 } 2316 } 2317 text_in[payload_length - 1] = '\0'; 2318 pr_debug("Successfully read %d bytes of text" 2319 " data.\n", payload_length); 2320 } 2321 2322 return iscsit_process_text_cmd(conn, cmd, hdr); 2323 2324 reject: 2325 kfree(cmd->text_in_ptr); 2326 cmd->text_in_ptr = NULL; 2327 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2328 } 2329 2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2331 { 2332 struct iscsi_conn *conn_p; 2333 struct iscsi_session *sess = conn->sess; 2334 2335 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2336 " for SID: %u.\n", conn->cid, conn->sess->sid); 2337 2338 atomic_set(&sess->session_logout, 1); 2339 atomic_set(&conn->conn_logout_remove, 1); 2340 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2341 2342 iscsit_inc_conn_usage_count(conn); 2343 iscsit_inc_session_usage_count(sess); 2344 2345 spin_lock_bh(&sess->conn_lock); 2346 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2347 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2348 continue; 2349 2350 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2351 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2352 } 2353 spin_unlock_bh(&sess->conn_lock); 2354 2355 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2356 2357 return 0; 2358 } 2359 2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2361 { 2362 struct iscsi_conn *l_conn; 2363 struct iscsi_session *sess = conn->sess; 2364 2365 pr_debug("Received logout request CLOSECONNECTION for CID:" 2366 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2367 2368 /* 2369 * A Logout Request with a CLOSECONNECTION reason code for a CID 2370 * can arrive on a connection with a differing CID. 2371 */ 2372 if (conn->cid == cmd->logout_cid) { 2373 spin_lock_bh(&conn->state_lock); 2374 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2375 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2376 2377 atomic_set(&conn->conn_logout_remove, 1); 2378 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2379 iscsit_inc_conn_usage_count(conn); 2380 2381 spin_unlock_bh(&conn->state_lock); 2382 } else { 2383 /* 2384 * Handle all different cid CLOSECONNECTION requests in 2385 * iscsit_logout_post_handler_diffcid() as to give enough 2386 * time for any non immediate command's CmdSN to be 2387 * acknowledged on the connection in question. 2388 * 2389 * Here we simply make sure the CID is still around. 2390 */ 2391 l_conn = iscsit_get_conn_from_cid(sess, 2392 cmd->logout_cid); 2393 if (!l_conn) { 2394 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2395 iscsit_add_cmd_to_response_queue(cmd, conn, 2396 cmd->i_state); 2397 return 0; 2398 } 2399 2400 iscsit_dec_conn_usage_count(l_conn); 2401 } 2402 2403 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2404 2405 return 0; 2406 } 2407 2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2409 { 2410 struct iscsi_session *sess = conn->sess; 2411 2412 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2413 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2414 2415 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2416 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2417 " while ERL!=2.\n"); 2418 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2419 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2420 return 0; 2421 } 2422 2423 if (conn->cid == cmd->logout_cid) { 2424 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2425 " with CID: %hu on CID: %hu, implementation error.\n", 2426 cmd->logout_cid, conn->cid); 2427 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2429 return 0; 2430 } 2431 2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2433 2434 return 0; 2435 } 2436 2437 int 2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2439 unsigned char *buf) 2440 { 2441 int cmdsn_ret, logout_remove = 0; 2442 u8 reason_code = 0; 2443 struct iscsi_logout *hdr; 2444 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2445 2446 hdr = (struct iscsi_logout *) buf; 2447 reason_code = (hdr->flags & 0x7f); 2448 2449 if (tiqn) { 2450 spin_lock(&tiqn->logout_stats.lock); 2451 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2452 tiqn->logout_stats.normal_logouts++; 2453 else 2454 tiqn->logout_stats.abnormal_logouts++; 2455 spin_unlock(&tiqn->logout_stats.lock); 2456 } 2457 2458 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2459 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2460 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2461 hdr->cid, conn->cid); 2462 2463 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2464 pr_err("Received logout request on connection that" 2465 " is not in logged in state, ignoring request.\n"); 2466 iscsit_free_cmd(cmd, false); 2467 return 0; 2468 } 2469 2470 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2471 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2472 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2473 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2474 cmd->targ_xfer_tag = 0xFFFFFFFF; 2475 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2476 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2477 cmd->logout_cid = be16_to_cpu(hdr->cid); 2478 cmd->logout_reason = reason_code; 2479 cmd->data_direction = DMA_NONE; 2480 2481 /* 2482 * We need to sleep in these cases (by returning 1) until the Logout 2483 * Response gets sent in the tx thread. 2484 */ 2485 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2486 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2487 be16_to_cpu(hdr->cid) == conn->cid)) 2488 logout_remove = 1; 2489 2490 spin_lock_bh(&conn->cmd_lock); 2491 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2492 spin_unlock_bh(&conn->cmd_lock); 2493 2494 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2495 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2496 2497 /* 2498 * Immediate commands are executed, well, immediately. 2499 * Non-Immediate Logout Commands are executed in CmdSN order. 2500 */ 2501 if (cmd->immediate_cmd) { 2502 int ret = iscsit_execute_cmd(cmd, 0); 2503 2504 if (ret < 0) 2505 return ret; 2506 } else { 2507 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2508 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2509 logout_remove = 0; 2510 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2511 return -1; 2512 } 2513 2514 return logout_remove; 2515 } 2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2517 2518 int iscsit_handle_snack( 2519 struct iscsi_conn *conn, 2520 unsigned char *buf) 2521 { 2522 struct iscsi_snack *hdr; 2523 2524 hdr = (struct iscsi_snack *) buf; 2525 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2526 2527 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2528 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2529 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2530 hdr->begrun, hdr->runlength, conn->cid); 2531 2532 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2533 pr_err("Initiator sent SNACK request while in" 2534 " ErrorRecoveryLevel=0.\n"); 2535 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2536 buf); 2537 } 2538 /* 2539 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2540 * call from inside iscsi_send_recovery_datain_or_r2t(). 2541 */ 2542 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2543 case 0: 2544 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2545 hdr->itt, 2546 be32_to_cpu(hdr->ttt), 2547 be32_to_cpu(hdr->begrun), 2548 be32_to_cpu(hdr->runlength)); 2549 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2550 return iscsit_handle_status_snack(conn, hdr->itt, 2551 be32_to_cpu(hdr->ttt), 2552 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2553 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2554 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2555 be32_to_cpu(hdr->begrun), 2556 be32_to_cpu(hdr->runlength)); 2557 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2558 /* FIXME: Support R-Data SNACK */ 2559 pr_err("R-Data SNACK Not Supported.\n"); 2560 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2561 buf); 2562 default: 2563 pr_err("Unknown SNACK type 0x%02x, protocol" 2564 " error.\n", hdr->flags & 0x0f); 2565 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2566 buf); 2567 } 2568 2569 return 0; 2570 } 2571 EXPORT_SYMBOL(iscsit_handle_snack); 2572 2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2574 { 2575 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2576 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2577 wait_for_completion_interruptible_timeout( 2578 &conn->rx_half_close_comp, 2579 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2580 } 2581 } 2582 2583 static int iscsit_handle_immediate_data( 2584 struct iscsi_cmd *cmd, 2585 struct iscsi_scsi_req *hdr, 2586 u32 length) 2587 { 2588 int iov_ret, rx_got = 0, rx_size = 0; 2589 u32 checksum, iov_count = 0, padding = 0; 2590 struct iscsi_conn *conn = cmd->conn; 2591 struct kvec *iov; 2592 2593 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2594 if (iov_ret < 0) 2595 return IMMEDIATE_DATA_CANNOT_RECOVER; 2596 2597 rx_size = length; 2598 iov_count = iov_ret; 2599 iov = &cmd->iov_data[0]; 2600 2601 padding = ((-length) & 3); 2602 if (padding != 0) { 2603 iov[iov_count].iov_base = cmd->pad_bytes; 2604 iov[iov_count++].iov_len = padding; 2605 rx_size += padding; 2606 } 2607 2608 if (conn->conn_ops->DataDigest) { 2609 iov[iov_count].iov_base = &checksum; 2610 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2611 rx_size += ISCSI_CRC_LEN; 2612 } 2613 2614 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2615 2616 iscsit_unmap_iovec(cmd); 2617 2618 if (rx_got != rx_size) { 2619 iscsit_rx_thread_wait_for_tcp(conn); 2620 return IMMEDIATE_DATA_CANNOT_RECOVER; 2621 } 2622 2623 if (conn->conn_ops->DataDigest) { 2624 u32 data_crc; 2625 2626 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2627 cmd->write_data_done, length, padding, 2628 cmd->pad_bytes); 2629 2630 if (checksum != data_crc) { 2631 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2632 " does not match computed 0x%08x\n", checksum, 2633 data_crc); 2634 2635 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2636 pr_err("Unable to recover from" 2637 " Immediate Data digest failure while" 2638 " in ERL=0.\n"); 2639 iscsit_reject_cmd(cmd, 2640 ISCSI_REASON_DATA_DIGEST_ERROR, 2641 (unsigned char *)hdr); 2642 return IMMEDIATE_DATA_CANNOT_RECOVER; 2643 } else { 2644 iscsit_reject_cmd(cmd, 2645 ISCSI_REASON_DATA_DIGEST_ERROR, 2646 (unsigned char *)hdr); 2647 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2648 } 2649 } else { 2650 pr_debug("Got CRC32C DataDigest 0x%08x for" 2651 " %u bytes of Immediate Data\n", checksum, 2652 length); 2653 } 2654 } 2655 2656 cmd->write_data_done += length; 2657 2658 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2659 spin_lock_bh(&cmd->istate_lock); 2660 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2661 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2662 spin_unlock_bh(&cmd->istate_lock); 2663 } 2664 2665 return IMMEDIATE_DATA_NORMAL_OPERATION; 2666 } 2667 2668 /* 2669 * Called with sess->conn_lock held. 2670 */ 2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2672 with active network interface */ 2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2674 { 2675 struct iscsi_cmd *cmd; 2676 struct iscsi_conn *conn_p; 2677 bool found = false; 2678 2679 /* 2680 * Only send a Asynchronous Message on connections whos network 2681 * interface is still functional. 2682 */ 2683 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2684 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2685 iscsit_inc_conn_usage_count(conn_p); 2686 found = true; 2687 break; 2688 } 2689 } 2690 2691 if (!found) 2692 return; 2693 2694 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2695 if (!cmd) { 2696 iscsit_dec_conn_usage_count(conn_p); 2697 return; 2698 } 2699 2700 cmd->logout_cid = conn->cid; 2701 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2702 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2703 2704 spin_lock_bh(&conn_p->cmd_lock); 2705 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2706 spin_unlock_bh(&conn_p->cmd_lock); 2707 2708 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2709 iscsit_dec_conn_usage_count(conn_p); 2710 } 2711 2712 static int iscsit_send_conn_drop_async_message( 2713 struct iscsi_cmd *cmd, 2714 struct iscsi_conn *conn) 2715 { 2716 struct iscsi_async *hdr; 2717 2718 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2719 2720 hdr = (struct iscsi_async *) cmd->pdu; 2721 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2722 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2723 cmd->init_task_tag = RESERVED_ITT; 2724 cmd->targ_xfer_tag = 0xFFFFFFFF; 2725 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2726 cmd->stat_sn = conn->stat_sn++; 2727 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2728 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2729 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2730 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2731 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2732 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2733 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2734 2735 pr_debug("Sending Connection Dropped Async Message StatSN:" 2736 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2737 cmd->logout_cid, conn->cid); 2738 2739 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2740 } 2741 2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2743 { 2744 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2745 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2746 wait_for_completion_interruptible_timeout( 2747 &conn->tx_half_close_comp, 2748 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2749 } 2750 } 2751 2752 void 2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2754 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2755 bool set_statsn) 2756 { 2757 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2758 hdr->flags = datain->flags; 2759 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2760 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2761 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2762 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2763 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2764 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2765 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2766 } 2767 } 2768 hton24(hdr->dlength, datain->length); 2769 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2770 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2771 (struct scsi_lun *)&hdr->lun); 2772 else 2773 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2774 2775 hdr->itt = cmd->init_task_tag; 2776 2777 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2778 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2779 else 2780 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2781 if (set_statsn) 2782 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2783 else 2784 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2785 2786 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2787 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2788 hdr->datasn = cpu_to_be32(datain->data_sn); 2789 hdr->offset = cpu_to_be32(datain->offset); 2790 2791 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2792 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2793 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2794 ntohl(hdr->offset), datain->length, conn->cid); 2795 } 2796 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2797 2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2799 { 2800 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2801 struct iscsi_datain datain; 2802 struct iscsi_datain_req *dr; 2803 int eodr = 0, ret; 2804 bool set_statsn = false; 2805 2806 memset(&datain, 0, sizeof(struct iscsi_datain)); 2807 dr = iscsit_get_datain_values(cmd, &datain); 2808 if (!dr) { 2809 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2810 cmd->init_task_tag); 2811 return -1; 2812 } 2813 /* 2814 * Be paranoid and double check the logic for now. 2815 */ 2816 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2817 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2818 " datain.length: %u exceeds cmd->data_length: %u\n", 2819 cmd->init_task_tag, datain.offset, datain.length, 2820 cmd->se_cmd.data_length); 2821 return -1; 2822 } 2823 2824 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2825 /* 2826 * Special case for successfully execution w/ both DATAIN 2827 * and Sense Data. 2828 */ 2829 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2830 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2831 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2832 else { 2833 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2834 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2835 iscsit_increment_maxcmdsn(cmd, conn->sess); 2836 cmd->stat_sn = conn->stat_sn++; 2837 set_statsn = true; 2838 } else if (dr->dr_complete == 2839 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2840 set_statsn = true; 2841 } 2842 2843 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2844 2845 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2846 if (ret < 0) 2847 return ret; 2848 2849 if (dr->dr_complete) { 2850 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2851 2 : 1; 2852 iscsit_free_datain_req(cmd, dr); 2853 } 2854 2855 return eodr; 2856 } 2857 2858 int 2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2860 struct iscsi_logout_rsp *hdr) 2861 { 2862 struct iscsi_conn *logout_conn = NULL; 2863 struct iscsi_conn_recovery *cr = NULL; 2864 struct iscsi_session *sess = conn->sess; 2865 /* 2866 * The actual shutting down of Sessions and/or Connections 2867 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2868 * is done in scsi_logout_post_handler(). 2869 */ 2870 switch (cmd->logout_reason) { 2871 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2872 pr_debug("iSCSI session logout successful, setting" 2873 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2874 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2875 break; 2876 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2877 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2878 break; 2879 /* 2880 * For CLOSECONNECTION logout requests carrying 2881 * a matching logout CID -> local CID, the reference 2882 * for the local CID will have been incremented in 2883 * iscsi_logout_closeconnection(). 2884 * 2885 * For CLOSECONNECTION logout requests carrying 2886 * a different CID than the connection it arrived 2887 * on, the connection responding to cmd->logout_cid 2888 * is stopped in iscsit_logout_post_handler_diffcid(). 2889 */ 2890 2891 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2892 " successful.\n", cmd->logout_cid, conn->cid); 2893 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2894 break; 2895 case ISCSI_LOGOUT_REASON_RECOVERY: 2896 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2897 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2898 break; 2899 /* 2900 * If the connection is still active from our point of view 2901 * force connection recovery to occur. 2902 */ 2903 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2904 cmd->logout_cid); 2905 if (logout_conn) { 2906 iscsit_connection_reinstatement_rcfr(logout_conn); 2907 iscsit_dec_conn_usage_count(logout_conn); 2908 } 2909 2910 cr = iscsit_get_inactive_connection_recovery_entry( 2911 conn->sess, cmd->logout_cid); 2912 if (!cr) { 2913 pr_err("Unable to locate CID: %hu for" 2914 " REMOVECONNFORRECOVERY Logout Request.\n", 2915 cmd->logout_cid); 2916 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2917 break; 2918 } 2919 2920 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2921 2922 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2923 " for recovery for CID: %hu on CID: %hu successful.\n", 2924 cmd->logout_cid, conn->cid); 2925 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2926 break; 2927 default: 2928 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2929 cmd->logout_reason); 2930 return -1; 2931 } 2932 2933 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2934 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2935 hdr->response = cmd->logout_response; 2936 hdr->itt = cmd->init_task_tag; 2937 cmd->stat_sn = conn->stat_sn++; 2938 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2939 2940 iscsit_increment_maxcmdsn(cmd, conn->sess); 2941 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2942 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2943 2944 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2945 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2946 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2947 cmd->logout_cid, conn->cid); 2948 2949 return 0; 2950 } 2951 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2952 2953 static int 2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2955 { 2956 int rc; 2957 2958 rc = iscsit_build_logout_rsp(cmd, conn, 2959 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2960 if (rc < 0) 2961 return rc; 2962 2963 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2964 } 2965 2966 void 2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2968 struct iscsi_nopin *hdr, bool nopout_response) 2969 { 2970 hdr->opcode = ISCSI_OP_NOOP_IN; 2971 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2972 hton24(hdr->dlength, cmd->buf_ptr_size); 2973 if (nopout_response) 2974 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2975 hdr->itt = cmd->init_task_tag; 2976 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2977 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2978 conn->stat_sn; 2979 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2980 2981 if (nopout_response) 2982 iscsit_increment_maxcmdsn(cmd, conn->sess); 2983 2984 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2985 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2986 2987 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 2988 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 2989 "Solicited" : "Unsolicited", cmd->init_task_tag, 2990 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 2991 } 2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 2993 2994 /* 2995 * Unsolicited NOPIN, either requesting a response or not. 2996 */ 2997 static int iscsit_send_unsolicited_nopin( 2998 struct iscsi_cmd *cmd, 2999 struct iscsi_conn *conn, 3000 int want_response) 3001 { 3002 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3003 int ret; 3004 3005 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3006 3007 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3008 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3009 3010 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3011 if (ret < 0) 3012 return ret; 3013 3014 spin_lock_bh(&cmd->istate_lock); 3015 cmd->i_state = want_response ? 3016 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3017 spin_unlock_bh(&cmd->istate_lock); 3018 3019 return 0; 3020 } 3021 3022 static int 3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3024 { 3025 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3026 3027 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3028 3029 /* 3030 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3031 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3032 */ 3033 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3034 3035 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3036 cmd->buf_ptr, 3037 cmd->buf_ptr_size); 3038 } 3039 3040 static int iscsit_send_r2t( 3041 struct iscsi_cmd *cmd, 3042 struct iscsi_conn *conn) 3043 { 3044 struct iscsi_r2t *r2t; 3045 struct iscsi_r2t_rsp *hdr; 3046 int ret; 3047 3048 r2t = iscsit_get_r2t_from_list(cmd); 3049 if (!r2t) 3050 return -1; 3051 3052 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3053 memset(hdr, 0, ISCSI_HDR_LEN); 3054 hdr->opcode = ISCSI_OP_R2T; 3055 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3056 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3057 (struct scsi_lun *)&hdr->lun); 3058 hdr->itt = cmd->init_task_tag; 3059 if (conn->conn_transport->iscsit_get_r2t_ttt) 3060 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3061 else 3062 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3063 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3064 hdr->statsn = cpu_to_be32(conn->stat_sn); 3065 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3066 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3067 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3068 hdr->data_offset = cpu_to_be32(r2t->offset); 3069 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3070 3071 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3072 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3073 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3074 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3075 r2t->offset, r2t->xfer_len, conn->cid); 3076 3077 spin_lock_bh(&cmd->r2t_lock); 3078 r2t->sent_r2t = 1; 3079 spin_unlock_bh(&cmd->r2t_lock); 3080 3081 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3082 if (ret < 0) { 3083 return ret; 3084 } 3085 3086 spin_lock_bh(&cmd->dataout_timeout_lock); 3087 iscsit_start_dataout_timer(cmd, conn); 3088 spin_unlock_bh(&cmd->dataout_timeout_lock); 3089 3090 return 0; 3091 } 3092 3093 /* 3094 * @recovery: If called from iscsi_task_reassign_complete_write() for 3095 * connection recovery. 3096 */ 3097 int iscsit_build_r2ts_for_cmd( 3098 struct iscsi_conn *conn, 3099 struct iscsi_cmd *cmd, 3100 bool recovery) 3101 { 3102 int first_r2t = 1; 3103 u32 offset = 0, xfer_len = 0; 3104 3105 spin_lock_bh(&cmd->r2t_lock); 3106 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3107 spin_unlock_bh(&cmd->r2t_lock); 3108 return 0; 3109 } 3110 3111 if (conn->sess->sess_ops->DataSequenceInOrder && 3112 !recovery) 3113 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3114 3115 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3116 if (conn->sess->sess_ops->DataSequenceInOrder) { 3117 offset = cmd->r2t_offset; 3118 3119 if (first_r2t && recovery) { 3120 int new_data_end = offset + 3121 conn->sess->sess_ops->MaxBurstLength - 3122 cmd->next_burst_len; 3123 3124 if (new_data_end > cmd->se_cmd.data_length) 3125 xfer_len = cmd->se_cmd.data_length - offset; 3126 else 3127 xfer_len = 3128 conn->sess->sess_ops->MaxBurstLength - 3129 cmd->next_burst_len; 3130 } else { 3131 int new_data_end = offset + 3132 conn->sess->sess_ops->MaxBurstLength; 3133 3134 if (new_data_end > cmd->se_cmd.data_length) 3135 xfer_len = cmd->se_cmd.data_length - offset; 3136 else 3137 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3138 } 3139 cmd->r2t_offset += xfer_len; 3140 3141 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3142 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3143 } else { 3144 struct iscsi_seq *seq; 3145 3146 seq = iscsit_get_seq_holder_for_r2t(cmd); 3147 if (!seq) { 3148 spin_unlock_bh(&cmd->r2t_lock); 3149 return -1; 3150 } 3151 3152 offset = seq->offset; 3153 xfer_len = seq->xfer_len; 3154 3155 if (cmd->seq_send_order == cmd->seq_count) 3156 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3157 } 3158 cmd->outstanding_r2ts++; 3159 first_r2t = 0; 3160 3161 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3162 spin_unlock_bh(&cmd->r2t_lock); 3163 return -1; 3164 } 3165 3166 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3167 break; 3168 } 3169 spin_unlock_bh(&cmd->r2t_lock); 3170 3171 return 0; 3172 } 3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3174 3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3176 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3177 { 3178 if (inc_stat_sn) 3179 cmd->stat_sn = conn->stat_sn++; 3180 3181 atomic_long_inc(&conn->sess->rsp_pdus); 3182 3183 memset(hdr, 0, ISCSI_HDR_LEN); 3184 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3185 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3186 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3187 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3188 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3189 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3190 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3191 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3192 } 3193 hdr->response = cmd->iscsi_response; 3194 hdr->cmd_status = cmd->se_cmd.scsi_status; 3195 hdr->itt = cmd->init_task_tag; 3196 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3197 3198 iscsit_increment_maxcmdsn(cmd, conn->sess); 3199 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3200 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3201 3202 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3203 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3204 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3205 cmd->se_cmd.scsi_status, conn->cid); 3206 } 3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3208 3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3210 { 3211 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3212 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3213 void *data_buf = NULL; 3214 u32 padding = 0, data_buf_len = 0; 3215 3216 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3217 3218 /* 3219 * Attach SENSE DATA payload to iSCSI Response PDU 3220 */ 3221 if (cmd->se_cmd.sense_buffer && 3222 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3223 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3224 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3225 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3226 3227 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3228 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3229 data_buf = cmd->sense_buffer; 3230 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3231 3232 if (padding) { 3233 memset(cmd->sense_buffer + 3234 cmd->se_cmd.scsi_sense_length, 0, padding); 3235 pr_debug("Adding %u bytes of padding to" 3236 " SENSE.\n", padding); 3237 } 3238 3239 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3240 " Response PDU\n", 3241 cmd->se_cmd.scsi_sense_length); 3242 } 3243 3244 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3245 data_buf_len); 3246 } 3247 3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3249 { 3250 switch (se_tmr->response) { 3251 case TMR_FUNCTION_COMPLETE: 3252 return ISCSI_TMF_RSP_COMPLETE; 3253 case TMR_TASK_DOES_NOT_EXIST: 3254 return ISCSI_TMF_RSP_NO_TASK; 3255 case TMR_LUN_DOES_NOT_EXIST: 3256 return ISCSI_TMF_RSP_NO_LUN; 3257 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3258 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3259 case TMR_FUNCTION_REJECTED: 3260 default: 3261 return ISCSI_TMF_RSP_REJECTED; 3262 } 3263 } 3264 3265 void 3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3267 struct iscsi_tm_rsp *hdr) 3268 { 3269 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3270 3271 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3272 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3273 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3274 hdr->itt = cmd->init_task_tag; 3275 cmd->stat_sn = conn->stat_sn++; 3276 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3277 3278 iscsit_increment_maxcmdsn(cmd, conn->sess); 3279 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3280 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3281 3282 pr_debug("Built Task Management Response ITT: 0x%08x," 3283 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3284 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3285 } 3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3287 3288 static int 3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3290 { 3291 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3292 3293 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3294 3295 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3296 } 3297 3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3299 { 3300 bool ret = false; 3301 3302 if (np->np_sockaddr.ss_family == AF_INET6) { 3303 const struct sockaddr_in6 sin6 = { 3304 .sin6_addr = IN6ADDR_ANY_INIT }; 3305 struct sockaddr_in6 *sock_in6 = 3306 (struct sockaddr_in6 *)&np->np_sockaddr; 3307 3308 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3309 sin6.sin6_addr.s6_addr, 16)) 3310 ret = true; 3311 } else { 3312 struct sockaddr_in * sock_in = 3313 (struct sockaddr_in *)&np->np_sockaddr; 3314 3315 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3316 ret = true; 3317 } 3318 3319 return ret; 3320 } 3321 3322 #define SENDTARGETS_BUF_LIMIT 32768U 3323 3324 static int 3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3326 enum iscsit_transport_type network_transport, 3327 int skip_bytes, bool *completed) 3328 { 3329 char *payload = NULL; 3330 struct iscsi_conn *conn = cmd->conn; 3331 struct iscsi_portal_group *tpg; 3332 struct iscsi_tiqn *tiqn; 3333 struct iscsi_tpg_np *tpg_np; 3334 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3335 int target_name_printed; 3336 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3337 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3338 bool active; 3339 3340 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3341 SENDTARGETS_BUF_LIMIT); 3342 3343 payload = kzalloc(buffer_len, GFP_KERNEL); 3344 if (!payload) { 3345 pr_err("Unable to allocate memory for sendtargets" 3346 " response.\n"); 3347 return -ENOMEM; 3348 } 3349 /* 3350 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3351 * explicit case.. 3352 */ 3353 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3354 text_ptr = strchr(text_in, '='); 3355 if (!text_ptr) { 3356 pr_err("Unable to locate '=' string in text_in:" 3357 " %s\n", text_in); 3358 kfree(payload); 3359 return -EINVAL; 3360 } 3361 /* 3362 * Skip over '=' character.. 3363 */ 3364 text_ptr += 1; 3365 } 3366 3367 spin_lock(&tiqn_lock); 3368 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3369 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3370 strcmp(tiqn->tiqn, text_ptr)) { 3371 continue; 3372 } 3373 3374 target_name_printed = 0; 3375 3376 spin_lock(&tiqn->tiqn_tpg_lock); 3377 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3378 3379 /* If demo_mode_discovery=0 and generate_node_acls=0 3380 * (demo mode dislabed) do not return 3381 * TargetName+TargetAddress unless a NodeACL exists. 3382 */ 3383 3384 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3385 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3386 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3387 cmd->conn->sess->sess_ops->InitiatorName))) { 3388 continue; 3389 } 3390 3391 spin_lock(&tpg->tpg_state_lock); 3392 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3393 spin_unlock(&tpg->tpg_state_lock); 3394 3395 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3396 continue; 3397 3398 spin_lock(&tpg->tpg_np_lock); 3399 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3400 tpg_np_list) { 3401 struct iscsi_np *np = tpg_np->tpg_np; 3402 bool inaddr_any = iscsit_check_inaddr_any(np); 3403 struct sockaddr_storage *sockaddr; 3404 3405 if (np->np_network_transport != network_transport) 3406 continue; 3407 3408 if (!target_name_printed) { 3409 len = sprintf(buf, "TargetName=%s", 3410 tiqn->tiqn); 3411 len += 1; 3412 3413 if ((len + payload_len) > buffer_len) { 3414 spin_unlock(&tpg->tpg_np_lock); 3415 spin_unlock(&tiqn->tiqn_tpg_lock); 3416 end_of_buf = 1; 3417 goto eob; 3418 } 3419 3420 if (skip_bytes && len <= skip_bytes) { 3421 skip_bytes -= len; 3422 } else { 3423 memcpy(payload + payload_len, buf, len); 3424 payload_len += len; 3425 target_name_printed = 1; 3426 if (len > skip_bytes) 3427 skip_bytes = 0; 3428 } 3429 } 3430 3431 if (inaddr_any) 3432 sockaddr = &conn->local_sockaddr; 3433 else 3434 sockaddr = &np->np_sockaddr; 3435 3436 len = sprintf(buf, "TargetAddress=" 3437 "%pISpc,%hu", 3438 sockaddr, 3439 tpg->tpgt); 3440 len += 1; 3441 3442 if ((len + payload_len) > buffer_len) { 3443 spin_unlock(&tpg->tpg_np_lock); 3444 spin_unlock(&tiqn->tiqn_tpg_lock); 3445 end_of_buf = 1; 3446 goto eob; 3447 } 3448 3449 if (skip_bytes && len <= skip_bytes) { 3450 skip_bytes -= len; 3451 } else { 3452 memcpy(payload + payload_len, buf, len); 3453 payload_len += len; 3454 if (len > skip_bytes) 3455 skip_bytes = 0; 3456 } 3457 } 3458 spin_unlock(&tpg->tpg_np_lock); 3459 } 3460 spin_unlock(&tiqn->tiqn_tpg_lock); 3461 eob: 3462 if (end_of_buf) { 3463 *completed = false; 3464 break; 3465 } 3466 3467 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3468 break; 3469 } 3470 spin_unlock(&tiqn_lock); 3471 3472 cmd->buf_ptr = payload; 3473 3474 return payload_len; 3475 } 3476 3477 int 3478 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3479 struct iscsi_text_rsp *hdr, 3480 enum iscsit_transport_type network_transport) 3481 { 3482 int text_length, padding; 3483 bool completed = true; 3484 3485 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3486 cmd->read_data_done, 3487 &completed); 3488 if (text_length < 0) 3489 return text_length; 3490 3491 if (completed) { 3492 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3493 } else { 3494 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3495 cmd->read_data_done += text_length; 3496 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3497 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3498 } 3499 hdr->opcode = ISCSI_OP_TEXT_RSP; 3500 padding = ((-text_length) & 3); 3501 hton24(hdr->dlength, text_length); 3502 hdr->itt = cmd->init_task_tag; 3503 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3504 cmd->stat_sn = conn->stat_sn++; 3505 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3506 3507 iscsit_increment_maxcmdsn(cmd, conn->sess); 3508 /* 3509 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3510 * correctly increment MaxCmdSN for each response answering a 3511 * non immediate text request with a valid CmdSN. 3512 */ 3513 cmd->maxcmdsn_inc = 0; 3514 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3515 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3516 3517 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3518 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3519 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3520 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3521 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3522 3523 return text_length + padding; 3524 } 3525 EXPORT_SYMBOL(iscsit_build_text_rsp); 3526 3527 static int iscsit_send_text_rsp( 3528 struct iscsi_cmd *cmd, 3529 struct iscsi_conn *conn) 3530 { 3531 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3532 int text_length; 3533 3534 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3535 conn->conn_transport->transport_type); 3536 if (text_length < 0) 3537 return text_length; 3538 3539 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3540 cmd->buf_ptr, 3541 text_length); 3542 } 3543 3544 void 3545 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3546 struct iscsi_reject *hdr) 3547 { 3548 hdr->opcode = ISCSI_OP_REJECT; 3549 hdr->reason = cmd->reject_reason; 3550 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3551 hton24(hdr->dlength, ISCSI_HDR_LEN); 3552 hdr->ffffffff = cpu_to_be32(0xffffffff); 3553 cmd->stat_sn = conn->stat_sn++; 3554 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3555 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3556 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3557 3558 } 3559 EXPORT_SYMBOL(iscsit_build_reject); 3560 3561 static int iscsit_send_reject( 3562 struct iscsi_cmd *cmd, 3563 struct iscsi_conn *conn) 3564 { 3565 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3566 3567 iscsit_build_reject(cmd, conn, hdr); 3568 3569 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3570 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3571 3572 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3573 cmd->buf_ptr, 3574 ISCSI_HDR_LEN); 3575 } 3576 3577 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3578 { 3579 int ord, cpu; 3580 /* 3581 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3582 * within iscsit_start_kthreads() 3583 * 3584 * Here we use bitmap_id to determine which CPU that this 3585 * iSCSI connection's RX/TX threads will be scheduled to 3586 * execute upon. 3587 */ 3588 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3589 for_each_online_cpu(cpu) { 3590 if (ord-- == 0) { 3591 cpumask_set_cpu(cpu, conn->conn_cpumask); 3592 return; 3593 } 3594 } 3595 /* 3596 * This should never be reached.. 3597 */ 3598 dump_stack(); 3599 cpumask_setall(conn->conn_cpumask); 3600 } 3601 3602 int 3603 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3604 { 3605 int ret; 3606 3607 switch (state) { 3608 case ISTATE_SEND_R2T: 3609 ret = iscsit_send_r2t(cmd, conn); 3610 if (ret < 0) 3611 goto err; 3612 break; 3613 case ISTATE_REMOVE: 3614 spin_lock_bh(&conn->cmd_lock); 3615 list_del_init(&cmd->i_conn_node); 3616 spin_unlock_bh(&conn->cmd_lock); 3617 3618 iscsit_free_cmd(cmd, false); 3619 break; 3620 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3621 iscsit_mod_nopin_response_timer(conn); 3622 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3623 if (ret < 0) 3624 goto err; 3625 break; 3626 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3627 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3628 if (ret < 0) 3629 goto err; 3630 break; 3631 default: 3632 pr_err("Unknown Opcode: 0x%02x ITT:" 3633 " 0x%08x, i_state: %d on CID: %hu\n", 3634 cmd->iscsi_opcode, cmd->init_task_tag, state, 3635 conn->cid); 3636 goto err; 3637 } 3638 3639 return 0; 3640 3641 err: 3642 return -1; 3643 } 3644 EXPORT_SYMBOL(iscsit_immediate_queue); 3645 3646 static int 3647 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3648 { 3649 struct iscsit_transport *t = conn->conn_transport; 3650 struct iscsi_queue_req *qr; 3651 struct iscsi_cmd *cmd; 3652 u8 state; 3653 int ret; 3654 3655 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3656 atomic_set(&conn->check_immediate_queue, 0); 3657 cmd = qr->cmd; 3658 state = qr->state; 3659 kmem_cache_free(lio_qr_cache, qr); 3660 3661 ret = t->iscsit_immediate_queue(conn, cmd, state); 3662 if (ret < 0) 3663 return ret; 3664 } 3665 3666 return 0; 3667 } 3668 3669 int 3670 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3671 { 3672 int ret; 3673 3674 check_rsp_state: 3675 switch (state) { 3676 case ISTATE_SEND_DATAIN: 3677 ret = iscsit_send_datain(cmd, conn); 3678 if (ret < 0) 3679 goto err; 3680 else if (!ret) 3681 /* more drs */ 3682 goto check_rsp_state; 3683 else if (ret == 1) { 3684 /* all done */ 3685 spin_lock_bh(&cmd->istate_lock); 3686 cmd->i_state = ISTATE_SENT_STATUS; 3687 spin_unlock_bh(&cmd->istate_lock); 3688 3689 if (atomic_read(&conn->check_immediate_queue)) 3690 return 1; 3691 3692 return 0; 3693 } else if (ret == 2) { 3694 /* Still must send status, 3695 SCF_TRANSPORT_TASK_SENSE was set */ 3696 spin_lock_bh(&cmd->istate_lock); 3697 cmd->i_state = ISTATE_SEND_STATUS; 3698 spin_unlock_bh(&cmd->istate_lock); 3699 state = ISTATE_SEND_STATUS; 3700 goto check_rsp_state; 3701 } 3702 3703 break; 3704 case ISTATE_SEND_STATUS: 3705 case ISTATE_SEND_STATUS_RECOVERY: 3706 ret = iscsit_send_response(cmd, conn); 3707 break; 3708 case ISTATE_SEND_LOGOUTRSP: 3709 ret = iscsit_send_logout(cmd, conn); 3710 break; 3711 case ISTATE_SEND_ASYNCMSG: 3712 ret = iscsit_send_conn_drop_async_message( 3713 cmd, conn); 3714 break; 3715 case ISTATE_SEND_NOPIN: 3716 ret = iscsit_send_nopin(cmd, conn); 3717 break; 3718 case ISTATE_SEND_REJECT: 3719 ret = iscsit_send_reject(cmd, conn); 3720 break; 3721 case ISTATE_SEND_TASKMGTRSP: 3722 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3723 if (ret != 0) 3724 break; 3725 ret = iscsit_tmr_post_handler(cmd, conn); 3726 if (ret != 0) 3727 iscsit_fall_back_to_erl0(conn->sess); 3728 break; 3729 case ISTATE_SEND_TEXTRSP: 3730 ret = iscsit_send_text_rsp(cmd, conn); 3731 break; 3732 default: 3733 pr_err("Unknown Opcode: 0x%02x ITT:" 3734 " 0x%08x, i_state: %d on CID: %hu\n", 3735 cmd->iscsi_opcode, cmd->init_task_tag, 3736 state, conn->cid); 3737 goto err; 3738 } 3739 if (ret < 0) 3740 goto err; 3741 3742 switch (state) { 3743 case ISTATE_SEND_LOGOUTRSP: 3744 if (!iscsit_logout_post_handler(cmd, conn)) 3745 return -ECONNRESET; 3746 /* fall through */ 3747 case ISTATE_SEND_STATUS: 3748 case ISTATE_SEND_ASYNCMSG: 3749 case ISTATE_SEND_NOPIN: 3750 case ISTATE_SEND_STATUS_RECOVERY: 3751 case ISTATE_SEND_TEXTRSP: 3752 case ISTATE_SEND_TASKMGTRSP: 3753 case ISTATE_SEND_REJECT: 3754 spin_lock_bh(&cmd->istate_lock); 3755 cmd->i_state = ISTATE_SENT_STATUS; 3756 spin_unlock_bh(&cmd->istate_lock); 3757 break; 3758 default: 3759 pr_err("Unknown Opcode: 0x%02x ITT:" 3760 " 0x%08x, i_state: %d on CID: %hu\n", 3761 cmd->iscsi_opcode, cmd->init_task_tag, 3762 cmd->i_state, conn->cid); 3763 goto err; 3764 } 3765 3766 if (atomic_read(&conn->check_immediate_queue)) 3767 return 1; 3768 3769 return 0; 3770 3771 err: 3772 return -1; 3773 } 3774 EXPORT_SYMBOL(iscsit_response_queue); 3775 3776 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3777 { 3778 struct iscsit_transport *t = conn->conn_transport; 3779 struct iscsi_queue_req *qr; 3780 struct iscsi_cmd *cmd; 3781 u8 state; 3782 int ret; 3783 3784 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3785 cmd = qr->cmd; 3786 state = qr->state; 3787 kmem_cache_free(lio_qr_cache, qr); 3788 3789 ret = t->iscsit_response_queue(conn, cmd, state); 3790 if (ret == 1 || ret < 0) 3791 return ret; 3792 } 3793 3794 return 0; 3795 } 3796 3797 int iscsi_target_tx_thread(void *arg) 3798 { 3799 int ret = 0; 3800 struct iscsi_conn *conn = arg; 3801 /* 3802 * Allow ourselves to be interrupted by SIGINT so that a 3803 * connection recovery / failure event can be triggered externally. 3804 */ 3805 allow_signal(SIGINT); 3806 3807 while (!kthread_should_stop()) { 3808 /* 3809 * Ensure that both TX and RX per connection kthreads 3810 * are scheduled to run on the same CPU. 3811 */ 3812 iscsit_thread_check_cpumask(conn, current, 1); 3813 3814 wait_event_interruptible(conn->queues_wq, 3815 !iscsit_conn_all_queues_empty(conn)); 3816 3817 if (signal_pending(current)) 3818 goto transport_err; 3819 3820 get_immediate: 3821 ret = iscsit_handle_immediate_queue(conn); 3822 if (ret < 0) 3823 goto transport_err; 3824 3825 ret = iscsit_handle_response_queue(conn); 3826 if (ret == 1) 3827 goto get_immediate; 3828 else if (ret == -ECONNRESET) 3829 goto out; 3830 else if (ret < 0) 3831 goto transport_err; 3832 } 3833 3834 transport_err: 3835 /* 3836 * Avoid the normal connection failure code-path if this connection 3837 * is still within LOGIN mode, and iscsi_np process context is 3838 * responsible for cleaning up the early connection failure. 3839 */ 3840 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3841 iscsit_take_action_for_connection_exit(conn); 3842 out: 3843 return 0; 3844 } 3845 3846 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3847 { 3848 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3849 struct iscsi_cmd *cmd; 3850 int ret = 0; 3851 3852 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3853 case ISCSI_OP_SCSI_CMD: 3854 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3855 if (!cmd) 3856 goto reject; 3857 3858 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3859 break; 3860 case ISCSI_OP_SCSI_DATA_OUT: 3861 ret = iscsit_handle_data_out(conn, buf); 3862 break; 3863 case ISCSI_OP_NOOP_OUT: 3864 cmd = NULL; 3865 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3866 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3867 if (!cmd) 3868 goto reject; 3869 } 3870 ret = iscsit_handle_nop_out(conn, cmd, buf); 3871 break; 3872 case ISCSI_OP_SCSI_TMFUNC: 3873 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3874 if (!cmd) 3875 goto reject; 3876 3877 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3878 break; 3879 case ISCSI_OP_TEXT: 3880 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3881 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3882 if (!cmd) 3883 goto reject; 3884 } else { 3885 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3886 if (!cmd) 3887 goto reject; 3888 } 3889 3890 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3891 break; 3892 case ISCSI_OP_LOGOUT: 3893 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3894 if (!cmd) 3895 goto reject; 3896 3897 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3898 if (ret > 0) 3899 wait_for_completion_timeout(&conn->conn_logout_comp, 3900 SECONDS_FOR_LOGOUT_COMP * HZ); 3901 break; 3902 case ISCSI_OP_SNACK: 3903 ret = iscsit_handle_snack(conn, buf); 3904 break; 3905 default: 3906 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3907 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3908 pr_err("Cannot recover from unknown" 3909 " opcode while ERL=0, closing iSCSI connection.\n"); 3910 return -1; 3911 } 3912 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3913 " closing iSCSI connection.\n"); 3914 ret = -1; 3915 break; 3916 } 3917 3918 return ret; 3919 reject: 3920 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3921 } 3922 3923 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3924 { 3925 bool ret; 3926 3927 spin_lock_bh(&conn->state_lock); 3928 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3929 spin_unlock_bh(&conn->state_lock); 3930 3931 return ret; 3932 } 3933 3934 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3935 { 3936 int ret; 3937 u8 buffer[ISCSI_HDR_LEN], opcode; 3938 u32 checksum = 0, digest = 0; 3939 struct kvec iov; 3940 3941 while (!kthread_should_stop()) { 3942 /* 3943 * Ensure that both TX and RX per connection kthreads 3944 * are scheduled to run on the same CPU. 3945 */ 3946 iscsit_thread_check_cpumask(conn, current, 0); 3947 3948 memset(buffer, 0, ISCSI_HDR_LEN); 3949 memset(&iov, 0, sizeof(struct kvec)); 3950 3951 iov.iov_base = buffer; 3952 iov.iov_len = ISCSI_HDR_LEN; 3953 3954 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3955 if (ret != ISCSI_HDR_LEN) { 3956 iscsit_rx_thread_wait_for_tcp(conn); 3957 return; 3958 } 3959 3960 if (conn->conn_ops->HeaderDigest) { 3961 iov.iov_base = &digest; 3962 iov.iov_len = ISCSI_CRC_LEN; 3963 3964 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3965 if (ret != ISCSI_CRC_LEN) { 3966 iscsit_rx_thread_wait_for_tcp(conn); 3967 return; 3968 } 3969 3970 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 3971 buffer, ISCSI_HDR_LEN, 3972 0, NULL, (u8 *)&checksum); 3973 3974 if (digest != checksum) { 3975 pr_err("HeaderDigest CRC32C failed," 3976 " received 0x%08x, computed 0x%08x\n", 3977 digest, checksum); 3978 /* 3979 * Set the PDU to 0xff so it will intentionally 3980 * hit default in the switch below. 3981 */ 3982 memset(buffer, 0xff, ISCSI_HDR_LEN); 3983 atomic_long_inc(&conn->sess->conn_digest_errors); 3984 } else { 3985 pr_debug("Got HeaderDigest CRC32C" 3986 " 0x%08x\n", checksum); 3987 } 3988 } 3989 3990 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 3991 return; 3992 3993 opcode = buffer[0] & ISCSI_OPCODE_MASK; 3994 3995 if (conn->sess->sess_ops->SessionType && 3996 ((!(opcode & ISCSI_OP_TEXT)) || 3997 (!(opcode & ISCSI_OP_LOGOUT)))) { 3998 pr_err("Received illegal iSCSI Opcode: 0x%02x" 3999 " while in Discovery Session, rejecting.\n", opcode); 4000 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4001 buffer); 4002 return; 4003 } 4004 4005 ret = iscsi_target_rx_opcode(conn, buffer); 4006 if (ret < 0) 4007 return; 4008 } 4009 } 4010 4011 int iscsi_target_rx_thread(void *arg) 4012 { 4013 int rc; 4014 struct iscsi_conn *conn = arg; 4015 4016 /* 4017 * Allow ourselves to be interrupted by SIGINT so that a 4018 * connection recovery / failure event can be triggered externally. 4019 */ 4020 allow_signal(SIGINT); 4021 /* 4022 * Wait for iscsi_post_login_handler() to complete before allowing 4023 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4024 */ 4025 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4026 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4027 return 0; 4028 4029 if (!conn->conn_transport->iscsit_get_rx_pdu) 4030 return 0; 4031 4032 conn->conn_transport->iscsit_get_rx_pdu(conn); 4033 4034 if (!signal_pending(current)) 4035 atomic_set(&conn->transport_failed, 1); 4036 iscsit_take_action_for_connection_exit(conn); 4037 return 0; 4038 } 4039 4040 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4041 { 4042 LIST_HEAD(tmp_list); 4043 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4044 struct iscsi_session *sess = conn->sess; 4045 /* 4046 * We expect this function to only ever be called from either RX or TX 4047 * thread context via iscsit_close_connection() once the other context 4048 * has been reset -> returned sleeping pre-handler state. 4049 */ 4050 spin_lock_bh(&conn->cmd_lock); 4051 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4052 4053 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4054 struct se_cmd *se_cmd = &cmd->se_cmd; 4055 4056 if (se_cmd->se_tfo != NULL) { 4057 spin_lock(&se_cmd->t_state_lock); 4058 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4059 spin_unlock(&se_cmd->t_state_lock); 4060 } 4061 } 4062 spin_unlock_bh(&conn->cmd_lock); 4063 4064 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4065 list_del_init(&cmd->i_conn_node); 4066 4067 iscsit_increment_maxcmdsn(cmd, sess); 4068 iscsit_free_cmd(cmd, true); 4069 4070 } 4071 } 4072 4073 static void iscsit_stop_timers_for_cmds( 4074 struct iscsi_conn *conn) 4075 { 4076 struct iscsi_cmd *cmd; 4077 4078 spin_lock_bh(&conn->cmd_lock); 4079 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4080 if (cmd->data_direction == DMA_TO_DEVICE) 4081 iscsit_stop_dataout_timer(cmd); 4082 } 4083 spin_unlock_bh(&conn->cmd_lock); 4084 } 4085 4086 int iscsit_close_connection( 4087 struct iscsi_conn *conn) 4088 { 4089 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4090 struct iscsi_session *sess = conn->sess; 4091 4092 pr_debug("Closing iSCSI connection CID %hu on SID:" 4093 " %u\n", conn->cid, sess->sid); 4094 /* 4095 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4096 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4097 * sleeping and the logout response never got sent because the 4098 * connection failed. 4099 * 4100 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4101 * to signal logout response TX interrupt completion. Go ahead and skip 4102 * this for iser since isert_rx_opcode() does not wait on logout failure, 4103 * and to avoid iscsi_conn pointer dereference in iser-target code. 4104 */ 4105 if (!conn->conn_transport->rdma_shutdown) 4106 complete(&conn->conn_logout_comp); 4107 4108 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4109 if (conn->tx_thread && 4110 cmpxchg(&conn->tx_thread_active, true, false)) { 4111 send_sig(SIGINT, conn->tx_thread, 1); 4112 kthread_stop(conn->tx_thread); 4113 } 4114 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4115 if (conn->rx_thread && 4116 cmpxchg(&conn->rx_thread_active, true, false)) { 4117 send_sig(SIGINT, conn->rx_thread, 1); 4118 kthread_stop(conn->rx_thread); 4119 } 4120 } 4121 4122 spin_lock(&iscsit_global->ts_bitmap_lock); 4123 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4124 get_order(1)); 4125 spin_unlock(&iscsit_global->ts_bitmap_lock); 4126 4127 iscsit_stop_timers_for_cmds(conn); 4128 iscsit_stop_nopin_response_timer(conn); 4129 iscsit_stop_nopin_timer(conn); 4130 4131 if (conn->conn_transport->iscsit_wait_conn) 4132 conn->conn_transport->iscsit_wait_conn(conn); 4133 4134 /* 4135 * During Connection recovery drop unacknowledged out of order 4136 * commands for this connection, and prepare the other commands 4137 * for realligence. 4138 * 4139 * During normal operation clear the out of order commands (but 4140 * do not free the struct iscsi_ooo_cmdsn's) and release all 4141 * struct iscsi_cmds. 4142 */ 4143 if (atomic_read(&conn->connection_recovery)) { 4144 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4145 iscsit_prepare_cmds_for_realligance(conn); 4146 } else { 4147 iscsit_clear_ooo_cmdsns_for_conn(conn); 4148 iscsit_release_commands_from_conn(conn); 4149 } 4150 iscsit_free_queue_reqs_for_conn(conn); 4151 4152 /* 4153 * Handle decrementing session or connection usage count if 4154 * a logout response was not able to be sent because the 4155 * connection failed. Fall back to Session Recovery here. 4156 */ 4157 if (atomic_read(&conn->conn_logout_remove)) { 4158 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4159 iscsit_dec_conn_usage_count(conn); 4160 iscsit_dec_session_usage_count(sess); 4161 } 4162 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4163 iscsit_dec_conn_usage_count(conn); 4164 4165 atomic_set(&conn->conn_logout_remove, 0); 4166 atomic_set(&sess->session_reinstatement, 0); 4167 atomic_set(&sess->session_fall_back_to_erl0, 1); 4168 } 4169 4170 spin_lock_bh(&sess->conn_lock); 4171 list_del(&conn->conn_list); 4172 4173 /* 4174 * Attempt to let the Initiator know this connection failed by 4175 * sending an Connection Dropped Async Message on another 4176 * active connection. 4177 */ 4178 if (atomic_read(&conn->connection_recovery)) 4179 iscsit_build_conn_drop_async_message(conn); 4180 4181 spin_unlock_bh(&sess->conn_lock); 4182 4183 /* 4184 * If connection reinstatement is being performed on this connection, 4185 * up the connection reinstatement semaphore that is being blocked on 4186 * in iscsit_cause_connection_reinstatement(). 4187 */ 4188 spin_lock_bh(&conn->state_lock); 4189 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4190 spin_unlock_bh(&conn->state_lock); 4191 complete(&conn->conn_wait_comp); 4192 wait_for_completion(&conn->conn_post_wait_comp); 4193 spin_lock_bh(&conn->state_lock); 4194 } 4195 4196 /* 4197 * If connection reinstatement is being performed on this connection 4198 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4199 * connection wait rcfr semaphore that is being blocked on 4200 * an iscsit_connection_reinstatement_rcfr(). 4201 */ 4202 if (atomic_read(&conn->connection_wait_rcfr)) { 4203 spin_unlock_bh(&conn->state_lock); 4204 complete(&conn->conn_wait_rcfr_comp); 4205 wait_for_completion(&conn->conn_post_wait_comp); 4206 spin_lock_bh(&conn->state_lock); 4207 } 4208 atomic_set(&conn->connection_reinstatement, 1); 4209 spin_unlock_bh(&conn->state_lock); 4210 4211 /* 4212 * If any other processes are accessing this connection pointer we 4213 * must wait until they have completed. 4214 */ 4215 iscsit_check_conn_usage_count(conn); 4216 4217 ahash_request_free(conn->conn_tx_hash); 4218 if (conn->conn_rx_hash) { 4219 struct crypto_ahash *tfm; 4220 4221 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4222 ahash_request_free(conn->conn_rx_hash); 4223 crypto_free_ahash(tfm); 4224 } 4225 4226 free_cpumask_var(conn->conn_cpumask); 4227 4228 kfree(conn->conn_ops); 4229 conn->conn_ops = NULL; 4230 4231 if (conn->sock) 4232 sock_release(conn->sock); 4233 4234 if (conn->conn_transport->iscsit_free_conn) 4235 conn->conn_transport->iscsit_free_conn(conn); 4236 4237 iscsit_put_transport(conn->conn_transport); 4238 4239 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4240 conn->conn_state = TARG_CONN_STATE_FREE; 4241 kfree(conn); 4242 4243 spin_lock_bh(&sess->conn_lock); 4244 atomic_dec(&sess->nconn); 4245 pr_debug("Decremented iSCSI connection count to %hu from node:" 4246 " %s\n", atomic_read(&sess->nconn), 4247 sess->sess_ops->InitiatorName); 4248 /* 4249 * Make sure that if one connection fails in an non ERL=2 iSCSI 4250 * Session that they all fail. 4251 */ 4252 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4253 !atomic_read(&sess->session_logout)) 4254 atomic_set(&sess->session_fall_back_to_erl0, 1); 4255 4256 /* 4257 * If this was not the last connection in the session, and we are 4258 * performing session reinstatement or falling back to ERL=0, call 4259 * iscsit_stop_session() without sleeping to shutdown the other 4260 * active connections. 4261 */ 4262 if (atomic_read(&sess->nconn)) { 4263 if (!atomic_read(&sess->session_reinstatement) && 4264 !atomic_read(&sess->session_fall_back_to_erl0)) { 4265 spin_unlock_bh(&sess->conn_lock); 4266 return 0; 4267 } 4268 if (!atomic_read(&sess->session_stop_active)) { 4269 atomic_set(&sess->session_stop_active, 1); 4270 spin_unlock_bh(&sess->conn_lock); 4271 iscsit_stop_session(sess, 0, 0); 4272 return 0; 4273 } 4274 spin_unlock_bh(&sess->conn_lock); 4275 return 0; 4276 } 4277 4278 /* 4279 * If this was the last connection in the session and one of the 4280 * following is occurring: 4281 * 4282 * Session Reinstatement is not being performed, and are falling back 4283 * to ERL=0 call iscsit_close_session(). 4284 * 4285 * Session Logout was requested. iscsit_close_session() will be called 4286 * elsewhere. 4287 * 4288 * Session Continuation is not being performed, start the Time2Retain 4289 * handler and check if sleep_on_sess_wait_sem is active. 4290 */ 4291 if (!atomic_read(&sess->session_reinstatement) && 4292 atomic_read(&sess->session_fall_back_to_erl0)) { 4293 spin_unlock_bh(&sess->conn_lock); 4294 iscsit_close_session(sess); 4295 4296 return 0; 4297 } else if (atomic_read(&sess->session_logout)) { 4298 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4299 sess->session_state = TARG_SESS_STATE_FREE; 4300 spin_unlock_bh(&sess->conn_lock); 4301 4302 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4303 complete(&sess->session_wait_comp); 4304 4305 return 0; 4306 } else { 4307 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4308 sess->session_state = TARG_SESS_STATE_FAILED; 4309 4310 if (!atomic_read(&sess->session_continuation)) { 4311 spin_unlock_bh(&sess->conn_lock); 4312 iscsit_start_time2retain_handler(sess); 4313 } else 4314 spin_unlock_bh(&sess->conn_lock); 4315 4316 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4317 complete(&sess->session_wait_comp); 4318 4319 return 0; 4320 } 4321 } 4322 4323 /* 4324 * If the iSCSI Session for the iSCSI Initiator Node exists, 4325 * forcefully shutdown the iSCSI NEXUS. 4326 */ 4327 int iscsit_close_session(struct iscsi_session *sess) 4328 { 4329 struct iscsi_portal_group *tpg = sess->tpg; 4330 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4331 4332 if (atomic_read(&sess->nconn)) { 4333 pr_err("%d connection(s) still exist for iSCSI session" 4334 " to %s\n", atomic_read(&sess->nconn), 4335 sess->sess_ops->InitiatorName); 4336 BUG(); 4337 } 4338 4339 spin_lock_bh(&se_tpg->session_lock); 4340 atomic_set(&sess->session_logout, 1); 4341 atomic_set(&sess->session_reinstatement, 1); 4342 iscsit_stop_time2retain_timer(sess); 4343 spin_unlock_bh(&se_tpg->session_lock); 4344 4345 /* 4346 * transport_deregister_session_configfs() will clear the 4347 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4348 * can be setting it again with __transport_register_session() in 4349 * iscsi_post_login_handler() again after the iscsit_stop_session() 4350 * completes in iscsi_np context. 4351 */ 4352 transport_deregister_session_configfs(sess->se_sess); 4353 4354 /* 4355 * If any other processes are accessing this session pointer we must 4356 * wait until they have completed. If we are in an interrupt (the 4357 * time2retain handler) and contain and active session usage count we 4358 * restart the timer and exit. 4359 */ 4360 if (!in_interrupt()) { 4361 if (iscsit_check_session_usage_count(sess) == 1) 4362 iscsit_stop_session(sess, 1, 1); 4363 } else { 4364 if (iscsit_check_session_usage_count(sess) == 2) { 4365 atomic_set(&sess->session_logout, 0); 4366 iscsit_start_time2retain_handler(sess); 4367 return 0; 4368 } 4369 } 4370 4371 transport_deregister_session(sess->se_sess); 4372 4373 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4374 iscsit_free_connection_recovery_entires(sess); 4375 4376 iscsit_free_all_ooo_cmdsns(sess); 4377 4378 spin_lock_bh(&se_tpg->session_lock); 4379 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4380 sess->session_state = TARG_SESS_STATE_FREE; 4381 pr_debug("Released iSCSI session from node: %s\n", 4382 sess->sess_ops->InitiatorName); 4383 tpg->nsessions--; 4384 if (tpg->tpg_tiqn) 4385 tpg->tpg_tiqn->tiqn_nsessions--; 4386 4387 pr_debug("Decremented number of active iSCSI Sessions on" 4388 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4389 4390 spin_lock(&sess_idr_lock); 4391 idr_remove(&sess_idr, sess->session_index); 4392 spin_unlock(&sess_idr_lock); 4393 4394 kfree(sess->sess_ops); 4395 sess->sess_ops = NULL; 4396 spin_unlock_bh(&se_tpg->session_lock); 4397 4398 kfree(sess); 4399 return 0; 4400 } 4401 4402 static void iscsit_logout_post_handler_closesession( 4403 struct iscsi_conn *conn) 4404 { 4405 struct iscsi_session *sess = conn->sess; 4406 int sleep = 1; 4407 /* 4408 * Traditional iscsi/tcp will invoke this logic from TX thread 4409 * context during session logout, so clear tx_thread_active and 4410 * sleep if iscsit_close_connection() has not already occured. 4411 * 4412 * Since iser-target invokes this logic from it's own workqueue, 4413 * always sleep waiting for RX/TX thread shutdown to complete 4414 * within iscsit_close_connection(). 4415 */ 4416 if (!conn->conn_transport->rdma_shutdown) 4417 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4418 4419 atomic_set(&conn->conn_logout_remove, 0); 4420 complete(&conn->conn_logout_comp); 4421 4422 iscsit_dec_conn_usage_count(conn); 4423 iscsit_stop_session(sess, sleep, sleep); 4424 iscsit_dec_session_usage_count(sess); 4425 iscsit_close_session(sess); 4426 } 4427 4428 static void iscsit_logout_post_handler_samecid( 4429 struct iscsi_conn *conn) 4430 { 4431 int sleep = 1; 4432 4433 if (!conn->conn_transport->rdma_shutdown) 4434 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4435 4436 atomic_set(&conn->conn_logout_remove, 0); 4437 complete(&conn->conn_logout_comp); 4438 4439 iscsit_cause_connection_reinstatement(conn, sleep); 4440 iscsit_dec_conn_usage_count(conn); 4441 } 4442 4443 static void iscsit_logout_post_handler_diffcid( 4444 struct iscsi_conn *conn, 4445 u16 cid) 4446 { 4447 struct iscsi_conn *l_conn; 4448 struct iscsi_session *sess = conn->sess; 4449 bool conn_found = false; 4450 4451 if (!sess) 4452 return; 4453 4454 spin_lock_bh(&sess->conn_lock); 4455 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4456 if (l_conn->cid == cid) { 4457 iscsit_inc_conn_usage_count(l_conn); 4458 conn_found = true; 4459 break; 4460 } 4461 } 4462 spin_unlock_bh(&sess->conn_lock); 4463 4464 if (!conn_found) 4465 return; 4466 4467 if (l_conn->sock) 4468 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4469 4470 spin_lock_bh(&l_conn->state_lock); 4471 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4472 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4473 spin_unlock_bh(&l_conn->state_lock); 4474 4475 iscsit_cause_connection_reinstatement(l_conn, 1); 4476 iscsit_dec_conn_usage_count(l_conn); 4477 } 4478 4479 /* 4480 * Return of 0 causes the TX thread to restart. 4481 */ 4482 int iscsit_logout_post_handler( 4483 struct iscsi_cmd *cmd, 4484 struct iscsi_conn *conn) 4485 { 4486 int ret = 0; 4487 4488 switch (cmd->logout_reason) { 4489 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4490 switch (cmd->logout_response) { 4491 case ISCSI_LOGOUT_SUCCESS: 4492 case ISCSI_LOGOUT_CLEANUP_FAILED: 4493 default: 4494 iscsit_logout_post_handler_closesession(conn); 4495 break; 4496 } 4497 ret = 0; 4498 break; 4499 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4500 if (conn->cid == cmd->logout_cid) { 4501 switch (cmd->logout_response) { 4502 case ISCSI_LOGOUT_SUCCESS: 4503 case ISCSI_LOGOUT_CLEANUP_FAILED: 4504 default: 4505 iscsit_logout_post_handler_samecid(conn); 4506 break; 4507 } 4508 ret = 0; 4509 } else { 4510 switch (cmd->logout_response) { 4511 case ISCSI_LOGOUT_SUCCESS: 4512 iscsit_logout_post_handler_diffcid(conn, 4513 cmd->logout_cid); 4514 break; 4515 case ISCSI_LOGOUT_CID_NOT_FOUND: 4516 case ISCSI_LOGOUT_CLEANUP_FAILED: 4517 default: 4518 break; 4519 } 4520 ret = 1; 4521 } 4522 break; 4523 case ISCSI_LOGOUT_REASON_RECOVERY: 4524 switch (cmd->logout_response) { 4525 case ISCSI_LOGOUT_SUCCESS: 4526 case ISCSI_LOGOUT_CID_NOT_FOUND: 4527 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4528 case ISCSI_LOGOUT_CLEANUP_FAILED: 4529 default: 4530 break; 4531 } 4532 ret = 1; 4533 break; 4534 default: 4535 break; 4536 4537 } 4538 return ret; 4539 } 4540 EXPORT_SYMBOL(iscsit_logout_post_handler); 4541 4542 void iscsit_fail_session(struct iscsi_session *sess) 4543 { 4544 struct iscsi_conn *conn; 4545 4546 spin_lock_bh(&sess->conn_lock); 4547 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4548 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4549 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4550 } 4551 spin_unlock_bh(&sess->conn_lock); 4552 4553 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4554 sess->session_state = TARG_SESS_STATE_FAILED; 4555 } 4556 4557 int iscsit_free_session(struct iscsi_session *sess) 4558 { 4559 u16 conn_count = atomic_read(&sess->nconn); 4560 struct iscsi_conn *conn, *conn_tmp = NULL; 4561 int is_last; 4562 4563 spin_lock_bh(&sess->conn_lock); 4564 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4565 4566 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4567 conn_list) { 4568 if (conn_count == 0) 4569 break; 4570 4571 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4572 is_last = 1; 4573 } else { 4574 iscsit_inc_conn_usage_count(conn_tmp); 4575 is_last = 0; 4576 } 4577 iscsit_inc_conn_usage_count(conn); 4578 4579 spin_unlock_bh(&sess->conn_lock); 4580 iscsit_cause_connection_reinstatement(conn, 1); 4581 spin_lock_bh(&sess->conn_lock); 4582 4583 iscsit_dec_conn_usage_count(conn); 4584 if (is_last == 0) 4585 iscsit_dec_conn_usage_count(conn_tmp); 4586 4587 conn_count--; 4588 } 4589 4590 if (atomic_read(&sess->nconn)) { 4591 spin_unlock_bh(&sess->conn_lock); 4592 wait_for_completion(&sess->session_wait_comp); 4593 } else 4594 spin_unlock_bh(&sess->conn_lock); 4595 4596 iscsit_close_session(sess); 4597 return 0; 4598 } 4599 4600 void iscsit_stop_session( 4601 struct iscsi_session *sess, 4602 int session_sleep, 4603 int connection_sleep) 4604 { 4605 u16 conn_count = atomic_read(&sess->nconn); 4606 struct iscsi_conn *conn, *conn_tmp = NULL; 4607 int is_last; 4608 4609 spin_lock_bh(&sess->conn_lock); 4610 if (session_sleep) 4611 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4612 4613 if (connection_sleep) { 4614 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4615 conn_list) { 4616 if (conn_count == 0) 4617 break; 4618 4619 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4620 is_last = 1; 4621 } else { 4622 iscsit_inc_conn_usage_count(conn_tmp); 4623 is_last = 0; 4624 } 4625 iscsit_inc_conn_usage_count(conn); 4626 4627 spin_unlock_bh(&sess->conn_lock); 4628 iscsit_cause_connection_reinstatement(conn, 1); 4629 spin_lock_bh(&sess->conn_lock); 4630 4631 iscsit_dec_conn_usage_count(conn); 4632 if (is_last == 0) 4633 iscsit_dec_conn_usage_count(conn_tmp); 4634 conn_count--; 4635 } 4636 } else { 4637 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4638 iscsit_cause_connection_reinstatement(conn, 0); 4639 } 4640 4641 if (session_sleep && atomic_read(&sess->nconn)) { 4642 spin_unlock_bh(&sess->conn_lock); 4643 wait_for_completion(&sess->session_wait_comp); 4644 } else 4645 spin_unlock_bh(&sess->conn_lock); 4646 } 4647 4648 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4649 { 4650 struct iscsi_session *sess; 4651 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4652 struct se_session *se_sess, *se_sess_tmp; 4653 LIST_HEAD(free_list); 4654 int session_count = 0; 4655 4656 spin_lock_bh(&se_tpg->session_lock); 4657 if (tpg->nsessions && !force) { 4658 spin_unlock_bh(&se_tpg->session_lock); 4659 return -1; 4660 } 4661 4662 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4663 sess_list) { 4664 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4665 4666 spin_lock(&sess->conn_lock); 4667 if (atomic_read(&sess->session_fall_back_to_erl0) || 4668 atomic_read(&sess->session_logout) || 4669 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4670 spin_unlock(&sess->conn_lock); 4671 continue; 4672 } 4673 atomic_set(&sess->session_reinstatement, 1); 4674 spin_unlock(&sess->conn_lock); 4675 4676 list_move_tail(&se_sess->sess_list, &free_list); 4677 } 4678 spin_unlock_bh(&se_tpg->session_lock); 4679 4680 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4681 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4682 4683 iscsit_free_session(sess); 4684 session_count++; 4685 } 4686 4687 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4688 " Group: %hu\n", session_count, tpg->tpgt); 4689 return 0; 4690 } 4691 4692 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4693 MODULE_VERSION("4.1.x"); 4694 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4695 MODULE_LICENSE("GPL"); 4696 4697 module_init(iscsi_target_init_module); 4698 module_exit(iscsi_target_cleanup_module); 4699