1 /******************************************************************************* 2 * This file contains main functions related to the iSCSI Target Core Driver. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19 #include <crypto/hash.h> 20 #include <linux/string.h> 21 #include <linux/kthread.h> 22 #include <linux/completion.h> 23 #include <linux/module.h> 24 #include <linux/vmalloc.h> 25 #include <linux/idr.h> 26 #include <linux/delay.h> 27 #include <linux/sched/signal.h> 28 #include <asm/unaligned.h> 29 #include <net/ipv6.h> 30 #include <scsi/scsi_proto.h> 31 #include <scsi/iscsi_proto.h> 32 #include <scsi/scsi_tcq.h> 33 #include <target/target_core_base.h> 34 #include <target/target_core_fabric.h> 35 36 #include <target/iscsi/iscsi_target_core.h> 37 #include "iscsi_target_parameters.h" 38 #include "iscsi_target_seq_pdu_list.h" 39 #include "iscsi_target_datain_values.h" 40 #include "iscsi_target_erl0.h" 41 #include "iscsi_target_erl1.h" 42 #include "iscsi_target_erl2.h" 43 #include "iscsi_target_login.h" 44 #include "iscsi_target_tmr.h" 45 #include "iscsi_target_tpg.h" 46 #include "iscsi_target_util.h" 47 #include "iscsi_target.h" 48 #include "iscsi_target_device.h" 49 #include <target/iscsi/iscsi_target_stat.h> 50 51 #include <target/iscsi/iscsi_transport.h> 52 53 static LIST_HEAD(g_tiqn_list); 54 static LIST_HEAD(g_np_list); 55 static DEFINE_SPINLOCK(tiqn_lock); 56 static DEFINE_MUTEX(np_lock); 57 58 static struct idr tiqn_idr; 59 struct idr sess_idr; 60 struct mutex auth_id_lock; 61 spinlock_t sess_idr_lock; 62 63 struct iscsit_global *iscsit_global; 64 65 struct kmem_cache *lio_qr_cache; 66 struct kmem_cache *lio_dr_cache; 67 struct kmem_cache *lio_ooo_cache; 68 struct kmem_cache *lio_r2t_cache; 69 70 static int iscsit_handle_immediate_data(struct iscsi_cmd *, 71 struct iscsi_scsi_req *, u32); 72 73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 74 { 75 struct iscsi_tiqn *tiqn = NULL; 76 77 spin_lock(&tiqn_lock); 78 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 79 if (!strcmp(tiqn->tiqn, buf)) { 80 81 spin_lock(&tiqn->tiqn_state_lock); 82 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 83 tiqn->tiqn_access_count++; 84 spin_unlock(&tiqn->tiqn_state_lock); 85 spin_unlock(&tiqn_lock); 86 return tiqn; 87 } 88 spin_unlock(&tiqn->tiqn_state_lock); 89 } 90 } 91 spin_unlock(&tiqn_lock); 92 93 return NULL; 94 } 95 96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 97 { 98 spin_lock(&tiqn->tiqn_state_lock); 99 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 100 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 101 spin_unlock(&tiqn->tiqn_state_lock); 102 return 0; 103 } 104 spin_unlock(&tiqn->tiqn_state_lock); 105 106 return -1; 107 } 108 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 110 { 111 spin_lock(&tiqn->tiqn_state_lock); 112 tiqn->tiqn_access_count--; 113 spin_unlock(&tiqn->tiqn_state_lock); 114 } 115 116 /* 117 * Note that IQN formatting is expected to be done in userspace, and 118 * no explict IQN format checks are done here. 119 */ 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 121 { 122 struct iscsi_tiqn *tiqn = NULL; 123 int ret; 124 125 if (strlen(buf) >= ISCSI_IQN_LEN) { 126 pr_err("Target IQN exceeds %d bytes\n", 127 ISCSI_IQN_LEN); 128 return ERR_PTR(-EINVAL); 129 } 130 131 tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL); 132 if (!tiqn) { 133 pr_err("Unable to allocate struct iscsi_tiqn\n"); 134 return ERR_PTR(-ENOMEM); 135 } 136 137 sprintf(tiqn->tiqn, "%s", buf); 138 INIT_LIST_HEAD(&tiqn->tiqn_list); 139 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 140 spin_lock_init(&tiqn->tiqn_state_lock); 141 spin_lock_init(&tiqn->tiqn_tpg_lock); 142 spin_lock_init(&tiqn->sess_err_stats.lock); 143 spin_lock_init(&tiqn->login_stats.lock); 144 spin_lock_init(&tiqn->logout_stats.lock); 145 146 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 147 148 idr_preload(GFP_KERNEL); 149 spin_lock(&tiqn_lock); 150 151 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 152 if (ret < 0) { 153 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 154 spin_unlock(&tiqn_lock); 155 idr_preload_end(); 156 kfree(tiqn); 157 return ERR_PTR(ret); 158 } 159 tiqn->tiqn_index = ret; 160 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 161 162 spin_unlock(&tiqn_lock); 163 idr_preload_end(); 164 165 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 166 167 return tiqn; 168 169 } 170 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 172 { 173 /* 174 * Wait for accesses to said struct iscsi_tiqn to end. 175 */ 176 spin_lock(&tiqn->tiqn_state_lock); 177 while (tiqn->tiqn_access_count != 0) { 178 spin_unlock(&tiqn->tiqn_state_lock); 179 msleep(10); 180 spin_lock(&tiqn->tiqn_state_lock); 181 } 182 spin_unlock(&tiqn->tiqn_state_lock); 183 } 184 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 186 { 187 /* 188 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 189 * while holding tiqn->tiqn_state_lock. This means that all subsequent 190 * attempts to access this struct iscsi_tiqn will fail from both transport 191 * fabric and control code paths. 192 */ 193 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 194 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 195 return; 196 } 197 198 iscsit_wait_for_tiqn(tiqn); 199 200 spin_lock(&tiqn_lock); 201 list_del(&tiqn->tiqn_list); 202 idr_remove(&tiqn_idr, tiqn->tiqn_index); 203 spin_unlock(&tiqn_lock); 204 205 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 206 tiqn->tiqn); 207 kfree(tiqn); 208 } 209 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 211 { 212 int ret; 213 /* 214 * Determine if the network portal is accepting storage traffic. 215 */ 216 spin_lock_bh(&np->np_thread_lock); 217 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 218 spin_unlock_bh(&np->np_thread_lock); 219 return -1; 220 } 221 spin_unlock_bh(&np->np_thread_lock); 222 /* 223 * Determine if the portal group is accepting storage traffic. 224 */ 225 spin_lock_bh(&tpg->tpg_state_lock); 226 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 227 spin_unlock_bh(&tpg->tpg_state_lock); 228 return -1; 229 } 230 spin_unlock_bh(&tpg->tpg_state_lock); 231 232 /* 233 * Here we serialize access across the TIQN+TPG Tuple. 234 */ 235 ret = down_interruptible(&tpg->np_login_sem); 236 if (ret != 0) 237 return -1; 238 239 spin_lock_bh(&tpg->tpg_state_lock); 240 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 241 spin_unlock_bh(&tpg->tpg_state_lock); 242 up(&tpg->np_login_sem); 243 return -1; 244 } 245 spin_unlock_bh(&tpg->tpg_state_lock); 246 247 return 0; 248 } 249 250 void iscsit_login_kref_put(struct kref *kref) 251 { 252 struct iscsi_tpg_np *tpg_np = container_of(kref, 253 struct iscsi_tpg_np, tpg_np_kref); 254 255 complete(&tpg_np->tpg_np_comp); 256 } 257 258 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 259 struct iscsi_tpg_np *tpg_np) 260 { 261 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 262 263 up(&tpg->np_login_sem); 264 265 if (tpg_np) 266 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 267 268 if (tiqn) 269 iscsit_put_tiqn_for_login(tiqn); 270 271 return 0; 272 } 273 274 bool iscsit_check_np_match( 275 struct sockaddr_storage *sockaddr, 276 struct iscsi_np *np, 277 int network_transport) 278 { 279 struct sockaddr_in *sock_in, *sock_in_e; 280 struct sockaddr_in6 *sock_in6, *sock_in6_e; 281 bool ip_match = false; 282 u16 port, port_e; 283 284 if (sockaddr->ss_family == AF_INET6) { 285 sock_in6 = (struct sockaddr_in6 *)sockaddr; 286 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 287 288 if (!memcmp(&sock_in6->sin6_addr.in6_u, 289 &sock_in6_e->sin6_addr.in6_u, 290 sizeof(struct in6_addr))) 291 ip_match = true; 292 293 port = ntohs(sock_in6->sin6_port); 294 port_e = ntohs(sock_in6_e->sin6_port); 295 } else { 296 sock_in = (struct sockaddr_in *)sockaddr; 297 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 298 299 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 300 ip_match = true; 301 302 port = ntohs(sock_in->sin_port); 303 port_e = ntohs(sock_in_e->sin_port); 304 } 305 306 if (ip_match && (port_e == port) && 307 (np->np_network_transport == network_transport)) 308 return true; 309 310 return false; 311 } 312 313 /* 314 * Called with mutex np_lock held 315 */ 316 static struct iscsi_np *iscsit_get_np( 317 struct sockaddr_storage *sockaddr, 318 int network_transport) 319 { 320 struct iscsi_np *np; 321 bool match; 322 323 list_for_each_entry(np, &g_np_list, np_list) { 324 spin_lock_bh(&np->np_thread_lock); 325 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 326 spin_unlock_bh(&np->np_thread_lock); 327 continue; 328 } 329 330 match = iscsit_check_np_match(sockaddr, np, network_transport); 331 if (match) { 332 /* 333 * Increment the np_exports reference count now to 334 * prevent iscsit_del_np() below from being called 335 * while iscsi_tpg_add_network_portal() is called. 336 */ 337 np->np_exports++; 338 spin_unlock_bh(&np->np_thread_lock); 339 return np; 340 } 341 spin_unlock_bh(&np->np_thread_lock); 342 } 343 344 return NULL; 345 } 346 347 struct iscsi_np *iscsit_add_np( 348 struct sockaddr_storage *sockaddr, 349 int network_transport) 350 { 351 struct iscsi_np *np; 352 int ret; 353 354 mutex_lock(&np_lock); 355 356 /* 357 * Locate the existing struct iscsi_np if already active.. 358 */ 359 np = iscsit_get_np(sockaddr, network_transport); 360 if (np) { 361 mutex_unlock(&np_lock); 362 return np; 363 } 364 365 np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL); 366 if (!np) { 367 pr_err("Unable to allocate memory for struct iscsi_np\n"); 368 mutex_unlock(&np_lock); 369 return ERR_PTR(-ENOMEM); 370 } 371 372 np->np_flags |= NPF_IP_NETWORK; 373 np->np_network_transport = network_transport; 374 spin_lock_init(&np->np_thread_lock); 375 init_completion(&np->np_restart_comp); 376 INIT_LIST_HEAD(&np->np_list); 377 378 ret = iscsi_target_setup_login_socket(np, sockaddr); 379 if (ret != 0) { 380 kfree(np); 381 mutex_unlock(&np_lock); 382 return ERR_PTR(ret); 383 } 384 385 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 386 if (IS_ERR(np->np_thread)) { 387 pr_err("Unable to create kthread: iscsi_np\n"); 388 ret = PTR_ERR(np->np_thread); 389 kfree(np); 390 mutex_unlock(&np_lock); 391 return ERR_PTR(ret); 392 } 393 /* 394 * Increment the np_exports reference count now to prevent 395 * iscsit_del_np() below from being run while a new call to 396 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 397 * active. We don't need to hold np->np_thread_lock at this 398 * point because iscsi_np has not been added to g_np_list yet. 399 */ 400 np->np_exports = 1; 401 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 402 403 list_add_tail(&np->np_list, &g_np_list); 404 mutex_unlock(&np_lock); 405 406 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 407 &np->np_sockaddr, np->np_transport->name); 408 409 return np; 410 } 411 412 int iscsit_reset_np_thread( 413 struct iscsi_np *np, 414 struct iscsi_tpg_np *tpg_np, 415 struct iscsi_portal_group *tpg, 416 bool shutdown) 417 { 418 spin_lock_bh(&np->np_thread_lock); 419 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 420 spin_unlock_bh(&np->np_thread_lock); 421 return 0; 422 } 423 np->np_thread_state = ISCSI_NP_THREAD_RESET; 424 425 if (np->np_thread) { 426 spin_unlock_bh(&np->np_thread_lock); 427 send_sig(SIGINT, np->np_thread, 1); 428 wait_for_completion(&np->np_restart_comp); 429 spin_lock_bh(&np->np_thread_lock); 430 } 431 spin_unlock_bh(&np->np_thread_lock); 432 433 if (tpg_np && shutdown) { 434 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 435 436 wait_for_completion(&tpg_np->tpg_np_comp); 437 } 438 439 return 0; 440 } 441 442 static void iscsit_free_np(struct iscsi_np *np) 443 { 444 if (np->np_socket) 445 sock_release(np->np_socket); 446 } 447 448 int iscsit_del_np(struct iscsi_np *np) 449 { 450 spin_lock_bh(&np->np_thread_lock); 451 np->np_exports--; 452 if (np->np_exports) { 453 np->enabled = true; 454 spin_unlock_bh(&np->np_thread_lock); 455 return 0; 456 } 457 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 458 spin_unlock_bh(&np->np_thread_lock); 459 460 if (np->np_thread) { 461 /* 462 * We need to send the signal to wakeup Linux/Net 463 * which may be sleeping in sock_accept().. 464 */ 465 send_sig(SIGINT, np->np_thread, 1); 466 kthread_stop(np->np_thread); 467 np->np_thread = NULL; 468 } 469 470 np->np_transport->iscsit_free_np(np); 471 472 mutex_lock(&np_lock); 473 list_del(&np->np_list); 474 mutex_unlock(&np_lock); 475 476 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 477 &np->np_sockaddr, np->np_transport->name); 478 479 iscsit_put_transport(np->np_transport); 480 kfree(np); 481 return 0; 482 } 483 484 static void iscsit_get_rx_pdu(struct iscsi_conn *); 485 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 487 { 488 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 489 return 0; 490 } 491 EXPORT_SYMBOL(iscsit_queue_rsp); 492 493 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 494 { 495 bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD); 496 497 spin_lock_bh(&conn->cmd_lock); 498 if (!list_empty(&cmd->i_conn_node) && 499 !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP)) 500 list_del_init(&cmd->i_conn_node); 501 spin_unlock_bh(&conn->cmd_lock); 502 503 __iscsit_free_cmd(cmd, scsi_cmd, true); 504 } 505 EXPORT_SYMBOL(iscsit_aborted_task); 506 507 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 508 u32, u32, u8 *, u8 *); 509 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 510 511 static int 512 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 513 const void *data_buf, u32 data_buf_len) 514 { 515 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 516 struct kvec *iov; 517 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 518 int ret; 519 520 iov = &cmd->iov_misc[0]; 521 iov[niov].iov_base = cmd->pdu; 522 iov[niov++].iov_len = ISCSI_HDR_LEN; 523 524 if (conn->conn_ops->HeaderDigest) { 525 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 526 527 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 528 ISCSI_HDR_LEN, 0, NULL, 529 (u8 *)header_digest); 530 531 iov[0].iov_len += ISCSI_CRC_LEN; 532 tx_size += ISCSI_CRC_LEN; 533 pr_debug("Attaching CRC32C HeaderDigest" 534 " to opcode 0x%x 0x%08x\n", 535 hdr->opcode, *header_digest); 536 } 537 538 if (data_buf_len) { 539 u32 padding = ((-data_buf_len) & 3); 540 541 iov[niov].iov_base = (void *)data_buf; 542 iov[niov++].iov_len = data_buf_len; 543 tx_size += data_buf_len; 544 545 if (padding != 0) { 546 iov[niov].iov_base = &cmd->pad_bytes; 547 iov[niov++].iov_len = padding; 548 tx_size += padding; 549 pr_debug("Attaching %u additional" 550 " padding bytes.\n", padding); 551 } 552 553 if (conn->conn_ops->DataDigest) { 554 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 555 data_buf, data_buf_len, 556 padding, 557 (u8 *)&cmd->pad_bytes, 558 (u8 *)&cmd->data_crc); 559 560 iov[niov].iov_base = &cmd->data_crc; 561 iov[niov++].iov_len = ISCSI_CRC_LEN; 562 tx_size += ISCSI_CRC_LEN; 563 pr_debug("Attached DataDigest for %u" 564 " bytes opcode 0x%x, CRC 0x%08x\n", 565 data_buf_len, hdr->opcode, cmd->data_crc); 566 } 567 } 568 569 cmd->iov_misc_count = niov; 570 cmd->tx_size = tx_size; 571 572 ret = iscsit_send_tx_data(cmd, conn, 1); 573 if (ret < 0) { 574 iscsit_tx_thread_wait_for_tcp(conn); 575 return ret; 576 } 577 578 return 0; 579 } 580 581 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32); 582 static void iscsit_unmap_iovec(struct iscsi_cmd *); 583 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 584 u32, u32, u32, u8 *); 585 static int 586 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 587 const struct iscsi_datain *datain) 588 { 589 struct kvec *iov; 590 u32 iov_count = 0, tx_size = 0; 591 int ret, iov_ret; 592 593 iov = &cmd->iov_data[0]; 594 iov[iov_count].iov_base = cmd->pdu; 595 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 596 tx_size += ISCSI_HDR_LEN; 597 598 if (conn->conn_ops->HeaderDigest) { 599 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 600 601 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 602 ISCSI_HDR_LEN, 0, NULL, 603 (u8 *)header_digest); 604 605 iov[0].iov_len += ISCSI_CRC_LEN; 606 tx_size += ISCSI_CRC_LEN; 607 608 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 609 *header_digest); 610 } 611 612 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], 613 datain->offset, datain->length); 614 if (iov_ret < 0) 615 return -1; 616 617 iov_count += iov_ret; 618 tx_size += datain->length; 619 620 cmd->padding = ((-datain->length) & 3); 621 if (cmd->padding) { 622 iov[iov_count].iov_base = cmd->pad_bytes; 623 iov[iov_count++].iov_len = cmd->padding; 624 tx_size += cmd->padding; 625 626 pr_debug("Attaching %u padding bytes\n", cmd->padding); 627 } 628 629 if (conn->conn_ops->DataDigest) { 630 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 631 cmd, datain->offset, 632 datain->length, 633 cmd->padding, 634 cmd->pad_bytes); 635 636 iov[iov_count].iov_base = &cmd->data_crc; 637 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 638 tx_size += ISCSI_CRC_LEN; 639 640 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 641 datain->length + cmd->padding, cmd->data_crc); 642 } 643 644 cmd->iov_data_count = iov_count; 645 cmd->tx_size = tx_size; 646 647 ret = iscsit_fe_sendpage_sg(cmd, conn); 648 649 iscsit_unmap_iovec(cmd); 650 651 if (ret < 0) { 652 iscsit_tx_thread_wait_for_tcp(conn); 653 return ret; 654 } 655 656 return 0; 657 } 658 659 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 660 struct iscsi_datain_req *dr, const void *buf, 661 u32 buf_len) 662 { 663 if (dr) 664 return iscsit_xmit_datain_pdu(conn, cmd, buf); 665 else 666 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 667 } 668 669 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 670 { 671 return TARGET_PROT_NORMAL; 672 } 673 674 static struct iscsit_transport iscsi_target_transport = { 675 .name = "iSCSI/TCP", 676 .transport_type = ISCSI_TCP, 677 .rdma_shutdown = false, 678 .owner = NULL, 679 .iscsit_setup_np = iscsit_setup_np, 680 .iscsit_accept_np = iscsit_accept_np, 681 .iscsit_free_np = iscsit_free_np, 682 .iscsit_get_login_rx = iscsit_get_login_rx, 683 .iscsit_put_login_tx = iscsit_put_login_tx, 684 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 685 .iscsit_immediate_queue = iscsit_immediate_queue, 686 .iscsit_response_queue = iscsit_response_queue, 687 .iscsit_queue_data_in = iscsit_queue_rsp, 688 .iscsit_queue_status = iscsit_queue_rsp, 689 .iscsit_aborted_task = iscsit_aborted_task, 690 .iscsit_xmit_pdu = iscsit_xmit_pdu, 691 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 692 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 693 }; 694 695 static int __init iscsi_target_init_module(void) 696 { 697 int ret = 0, size; 698 699 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 700 701 iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL); 702 if (!iscsit_global) { 703 pr_err("Unable to allocate memory for iscsit_global\n"); 704 return -1; 705 } 706 spin_lock_init(&iscsit_global->ts_bitmap_lock); 707 mutex_init(&auth_id_lock); 708 spin_lock_init(&sess_idr_lock); 709 idr_init(&tiqn_idr); 710 idr_init(&sess_idr); 711 712 ret = target_register_template(&iscsi_ops); 713 if (ret) 714 goto out; 715 716 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 717 iscsit_global->ts_bitmap = vzalloc(size); 718 if (!iscsit_global->ts_bitmap) { 719 pr_err("Unable to allocate iscsit_global->ts_bitmap\n"); 720 goto configfs_out; 721 } 722 723 lio_qr_cache = kmem_cache_create("lio_qr_cache", 724 sizeof(struct iscsi_queue_req), 725 __alignof__(struct iscsi_queue_req), 0, NULL); 726 if (!lio_qr_cache) { 727 pr_err("nable to kmem_cache_create() for" 728 " lio_qr_cache\n"); 729 goto bitmap_out; 730 } 731 732 lio_dr_cache = kmem_cache_create("lio_dr_cache", 733 sizeof(struct iscsi_datain_req), 734 __alignof__(struct iscsi_datain_req), 0, NULL); 735 if (!lio_dr_cache) { 736 pr_err("Unable to kmem_cache_create() for" 737 " lio_dr_cache\n"); 738 goto qr_out; 739 } 740 741 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 742 sizeof(struct iscsi_ooo_cmdsn), 743 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 744 if (!lio_ooo_cache) { 745 pr_err("Unable to kmem_cache_create() for" 746 " lio_ooo_cache\n"); 747 goto dr_out; 748 } 749 750 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 751 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 752 0, NULL); 753 if (!lio_r2t_cache) { 754 pr_err("Unable to kmem_cache_create() for" 755 " lio_r2t_cache\n"); 756 goto ooo_out; 757 } 758 759 iscsit_register_transport(&iscsi_target_transport); 760 761 if (iscsit_load_discovery_tpg() < 0) 762 goto r2t_out; 763 764 return ret; 765 r2t_out: 766 iscsit_unregister_transport(&iscsi_target_transport); 767 kmem_cache_destroy(lio_r2t_cache); 768 ooo_out: 769 kmem_cache_destroy(lio_ooo_cache); 770 dr_out: 771 kmem_cache_destroy(lio_dr_cache); 772 qr_out: 773 kmem_cache_destroy(lio_qr_cache); 774 bitmap_out: 775 vfree(iscsit_global->ts_bitmap); 776 configfs_out: 777 /* XXX: this probably wants it to be it's own unwind step.. */ 778 if (iscsit_global->discovery_tpg) 779 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 780 target_unregister_template(&iscsi_ops); 781 out: 782 kfree(iscsit_global); 783 return -ENOMEM; 784 } 785 786 static void __exit iscsi_target_cleanup_module(void) 787 { 788 iscsit_release_discovery_tpg(); 789 iscsit_unregister_transport(&iscsi_target_transport); 790 kmem_cache_destroy(lio_qr_cache); 791 kmem_cache_destroy(lio_dr_cache); 792 kmem_cache_destroy(lio_ooo_cache); 793 kmem_cache_destroy(lio_r2t_cache); 794 795 /* 796 * Shutdown discovery sessions and disable discovery TPG 797 */ 798 if (iscsit_global->discovery_tpg) 799 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 800 801 target_unregister_template(&iscsi_ops); 802 803 vfree(iscsit_global->ts_bitmap); 804 kfree(iscsit_global); 805 } 806 807 int iscsit_add_reject( 808 struct iscsi_conn *conn, 809 u8 reason, 810 unsigned char *buf) 811 { 812 struct iscsi_cmd *cmd; 813 814 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 815 if (!cmd) 816 return -1; 817 818 cmd->iscsi_opcode = ISCSI_OP_REJECT; 819 cmd->reject_reason = reason; 820 821 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 822 if (!cmd->buf_ptr) { 823 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 824 iscsit_free_cmd(cmd, false); 825 return -1; 826 } 827 828 spin_lock_bh(&conn->cmd_lock); 829 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 830 spin_unlock_bh(&conn->cmd_lock); 831 832 cmd->i_state = ISTATE_SEND_REJECT; 833 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 834 835 return -1; 836 } 837 EXPORT_SYMBOL(iscsit_add_reject); 838 839 static int iscsit_add_reject_from_cmd( 840 struct iscsi_cmd *cmd, 841 u8 reason, 842 bool add_to_conn, 843 unsigned char *buf) 844 { 845 struct iscsi_conn *conn; 846 847 if (!cmd->conn) { 848 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 849 cmd->init_task_tag); 850 return -1; 851 } 852 conn = cmd->conn; 853 854 cmd->iscsi_opcode = ISCSI_OP_REJECT; 855 cmd->reject_reason = reason; 856 857 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 858 if (!cmd->buf_ptr) { 859 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 860 iscsit_free_cmd(cmd, false); 861 return -1; 862 } 863 864 if (add_to_conn) { 865 spin_lock_bh(&conn->cmd_lock); 866 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 867 spin_unlock_bh(&conn->cmd_lock); 868 } 869 870 cmd->i_state = ISTATE_SEND_REJECT; 871 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 872 /* 873 * Perform the kref_put now if se_cmd has already been setup by 874 * scsit_setup_scsi_cmd() 875 */ 876 if (cmd->se_cmd.se_tfo != NULL) { 877 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 878 target_put_sess_cmd(&cmd->se_cmd); 879 } 880 return -1; 881 } 882 883 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 884 unsigned char *buf) 885 { 886 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 887 } 888 889 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 890 { 891 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 892 } 893 EXPORT_SYMBOL(iscsit_reject_cmd); 894 895 /* 896 * Map some portion of the allocated scatterlist to an iovec, suitable for 897 * kernel sockets to copy data in/out. 898 */ 899 static int iscsit_map_iovec( 900 struct iscsi_cmd *cmd, 901 struct kvec *iov, 902 u32 data_offset, 903 u32 data_length) 904 { 905 u32 i = 0; 906 struct scatterlist *sg; 907 unsigned int page_off; 908 909 /* 910 * We know each entry in t_data_sg contains a page. 911 */ 912 u32 ent = data_offset / PAGE_SIZE; 913 914 if (ent >= cmd->se_cmd.t_data_nents) { 915 pr_err("Initial page entry out-of-bounds\n"); 916 return -1; 917 } 918 919 sg = &cmd->se_cmd.t_data_sg[ent]; 920 page_off = (data_offset % PAGE_SIZE); 921 922 cmd->first_data_sg = sg; 923 cmd->first_data_sg_off = page_off; 924 925 while (data_length) { 926 u32 cur_len = min_t(u32, data_length, sg->length - page_off); 927 928 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 929 iov[i].iov_len = cur_len; 930 931 data_length -= cur_len; 932 page_off = 0; 933 sg = sg_next(sg); 934 i++; 935 } 936 937 cmd->kmapped_nents = i; 938 939 return i; 940 } 941 942 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 943 { 944 u32 i; 945 struct scatterlist *sg; 946 947 sg = cmd->first_data_sg; 948 949 for (i = 0; i < cmd->kmapped_nents; i++) 950 kunmap(sg_page(&sg[i])); 951 } 952 953 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 954 { 955 LIST_HEAD(ack_list); 956 struct iscsi_cmd *cmd, *cmd_p; 957 958 conn->exp_statsn = exp_statsn; 959 960 if (conn->sess->sess_ops->RDMAExtensions) 961 return; 962 963 spin_lock_bh(&conn->cmd_lock); 964 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 965 spin_lock(&cmd->istate_lock); 966 if ((cmd->i_state == ISTATE_SENT_STATUS) && 967 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 968 cmd->i_state = ISTATE_REMOVE; 969 spin_unlock(&cmd->istate_lock); 970 list_move_tail(&cmd->i_conn_node, &ack_list); 971 continue; 972 } 973 spin_unlock(&cmd->istate_lock); 974 } 975 spin_unlock_bh(&conn->cmd_lock); 976 977 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 978 list_del_init(&cmd->i_conn_node); 979 iscsit_free_cmd(cmd, false); 980 } 981 } 982 983 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 984 { 985 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 986 987 iov_count += ISCSI_IOV_DATA_BUFFER; 988 989 cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL); 990 if (!cmd->iov_data) { 991 pr_err("Unable to allocate cmd->iov_data\n"); 992 return -ENOMEM; 993 } 994 995 cmd->orig_iov_data_count = iov_count; 996 return 0; 997 } 998 999 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1000 unsigned char *buf) 1001 { 1002 int data_direction, payload_length; 1003 struct iscsi_scsi_req *hdr; 1004 int iscsi_task_attr; 1005 int sam_task_attr; 1006 1007 atomic_long_inc(&conn->sess->cmd_pdus); 1008 1009 hdr = (struct iscsi_scsi_req *) buf; 1010 payload_length = ntoh24(hdr->dlength); 1011 1012 /* FIXME; Add checks for AdditionalHeaderSegment */ 1013 1014 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1015 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1016 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1017 " not set. Bad iSCSI Initiator.\n"); 1018 return iscsit_add_reject_cmd(cmd, 1019 ISCSI_REASON_BOOKMARK_INVALID, buf); 1020 } 1021 1022 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1023 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1024 /* 1025 * From RFC-3720 Section 10.3.1: 1026 * 1027 * "Either or both of R and W MAY be 1 when either the 1028 * Expected Data Transfer Length and/or Bidirectional Read 1029 * Expected Data Transfer Length are 0" 1030 * 1031 * For this case, go ahead and clear the unnecssary bits 1032 * to avoid any confusion with ->data_direction. 1033 */ 1034 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1035 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1036 1037 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1038 " set when Expected Data Transfer Length is 0 for" 1039 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1040 } 1041 1042 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1043 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1044 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1045 " MUST be set if Expected Data Transfer Length is not 0." 1046 " Bad iSCSI Initiator\n"); 1047 return iscsit_add_reject_cmd(cmd, 1048 ISCSI_REASON_BOOKMARK_INVALID, buf); 1049 } 1050 1051 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1052 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1053 pr_err("Bidirectional operations not supported!\n"); 1054 return iscsit_add_reject_cmd(cmd, 1055 ISCSI_REASON_BOOKMARK_INVALID, buf); 1056 } 1057 1058 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1059 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1060 " Scsi Command PDU.\n"); 1061 return iscsit_add_reject_cmd(cmd, 1062 ISCSI_REASON_BOOKMARK_INVALID, buf); 1063 } 1064 1065 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1066 pr_err("ImmediateData=No but DataSegmentLength=%u," 1067 " protocol error.\n", payload_length); 1068 return iscsit_add_reject_cmd(cmd, 1069 ISCSI_REASON_PROTOCOL_ERROR, buf); 1070 } 1071 1072 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1073 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1074 pr_err("Expected Data Transfer Length and Length of" 1075 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1076 " bit is not set protocol error\n"); 1077 return iscsit_add_reject_cmd(cmd, 1078 ISCSI_REASON_PROTOCOL_ERROR, buf); 1079 } 1080 1081 if (payload_length > be32_to_cpu(hdr->data_length)) { 1082 pr_err("DataSegmentLength: %u is greater than" 1083 " EDTL: %u, protocol error.\n", payload_length, 1084 hdr->data_length); 1085 return iscsit_add_reject_cmd(cmd, 1086 ISCSI_REASON_PROTOCOL_ERROR, buf); 1087 } 1088 1089 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1090 pr_err("DataSegmentLength: %u is greater than" 1091 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1092 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1093 return iscsit_add_reject_cmd(cmd, 1094 ISCSI_REASON_PROTOCOL_ERROR, buf); 1095 } 1096 1097 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1098 pr_err("DataSegmentLength: %u is greater than" 1099 " FirstBurstLength: %u, protocol error.\n", 1100 payload_length, conn->sess->sess_ops->FirstBurstLength); 1101 return iscsit_add_reject_cmd(cmd, 1102 ISCSI_REASON_BOOKMARK_INVALID, buf); 1103 } 1104 1105 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1106 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1107 DMA_NONE; 1108 1109 cmd->data_direction = data_direction; 1110 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1111 /* 1112 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1113 */ 1114 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1115 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1116 sam_task_attr = TCM_SIMPLE_TAG; 1117 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1118 sam_task_attr = TCM_ORDERED_TAG; 1119 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1120 sam_task_attr = TCM_HEAD_TAG; 1121 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1122 sam_task_attr = TCM_ACA_TAG; 1123 else { 1124 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1125 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1126 sam_task_attr = TCM_SIMPLE_TAG; 1127 } 1128 1129 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1130 cmd->i_state = ISTATE_NEW_CMD; 1131 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1132 cmd->immediate_data = (payload_length) ? 1 : 0; 1133 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1134 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1135 if (cmd->unsolicited_data) 1136 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1137 1138 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1139 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1140 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1141 else 1142 cmd->targ_xfer_tag = 0xFFFFFFFF; 1143 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1144 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1145 cmd->first_burst_len = payload_length; 1146 1147 if (!conn->sess->sess_ops->RDMAExtensions && 1148 cmd->data_direction == DMA_FROM_DEVICE) { 1149 struct iscsi_datain_req *dr; 1150 1151 dr = iscsit_allocate_datain_req(); 1152 if (!dr) 1153 return iscsit_add_reject_cmd(cmd, 1154 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1155 1156 iscsit_attach_datain_req(cmd, dr); 1157 } 1158 1159 /* 1160 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1161 */ 1162 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1163 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1164 cmd->data_direction, sam_task_attr, 1165 cmd->sense_buffer + 2); 1166 1167 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1168 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1169 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1170 conn->cid); 1171 1172 target_get_sess_cmd(&cmd->se_cmd, true); 1173 1174 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd, 1175 scsilun_to_int(&hdr->lun)); 1176 if (cmd->sense_reason) 1177 goto attach_cmd; 1178 1179 /* only used for printks or comparing with ->ref_task_tag */ 1180 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1181 cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb); 1182 if (cmd->sense_reason) { 1183 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1184 return iscsit_add_reject_cmd(cmd, 1185 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1186 } 1187 1188 goto attach_cmd; 1189 } 1190 1191 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1192 return iscsit_add_reject_cmd(cmd, 1193 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1194 } 1195 1196 attach_cmd: 1197 spin_lock_bh(&conn->cmd_lock); 1198 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1199 spin_unlock_bh(&conn->cmd_lock); 1200 /* 1201 * Check if we need to delay processing because of ALUA 1202 * Active/NonOptimized primary access state.. 1203 */ 1204 core_alua_check_nonop_delay(&cmd->se_cmd); 1205 1206 return 0; 1207 } 1208 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1209 1210 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd) 1211 { 1212 iscsit_set_dataout_sequence_values(cmd); 1213 1214 spin_lock_bh(&cmd->dataout_timeout_lock); 1215 iscsit_start_dataout_timer(cmd, cmd->conn); 1216 spin_unlock_bh(&cmd->dataout_timeout_lock); 1217 } 1218 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout); 1219 1220 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1221 struct iscsi_scsi_req *hdr) 1222 { 1223 int cmdsn_ret = 0; 1224 /* 1225 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1226 * the Immediate Bit is not set, and no Immediate 1227 * Data is attached. 1228 * 1229 * A PDU/CmdSN carrying Immediate Data can only 1230 * be processed after the DataCRC has passed. 1231 * If the DataCRC fails, the CmdSN MUST NOT 1232 * be acknowledged. (See below) 1233 */ 1234 if (!cmd->immediate_data) { 1235 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1236 (unsigned char *)hdr, hdr->cmdsn); 1237 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1238 return -1; 1239 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1240 target_put_sess_cmd(&cmd->se_cmd); 1241 return 0; 1242 } 1243 } 1244 1245 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1246 1247 /* 1248 * If no Immediate Data is attached, it's OK to return now. 1249 */ 1250 if (!cmd->immediate_data) { 1251 if (!cmd->sense_reason && cmd->unsolicited_data) 1252 iscsit_set_unsoliticed_dataout(cmd); 1253 if (!cmd->sense_reason) 1254 return 0; 1255 1256 target_put_sess_cmd(&cmd->se_cmd); 1257 return 0; 1258 } 1259 1260 /* 1261 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1262 * execution. These exceptions are processed in CmdSN order using 1263 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1264 */ 1265 if (cmd->sense_reason) { 1266 if (cmd->reject_reason) 1267 return 0; 1268 1269 return 1; 1270 } 1271 /* 1272 * Call directly into transport_generic_new_cmd() to perform 1273 * the backend memory allocation. 1274 */ 1275 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1276 if (cmd->sense_reason) 1277 return 1; 1278 1279 return 0; 1280 } 1281 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1282 1283 static int 1284 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1285 bool dump_payload) 1286 { 1287 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1288 /* 1289 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1290 */ 1291 if (dump_payload) 1292 goto after_immediate_data; 1293 1294 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1295 cmd->first_burst_len); 1296 after_immediate_data: 1297 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1298 /* 1299 * A PDU/CmdSN carrying Immediate Data passed 1300 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1301 * Immediate Bit is not set. 1302 */ 1303 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1304 (unsigned char *)hdr, hdr->cmdsn); 1305 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1306 return -1; 1307 1308 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1309 int rc; 1310 1311 rc = iscsit_dump_data_payload(cmd->conn, 1312 cmd->first_burst_len, 1); 1313 target_put_sess_cmd(&cmd->se_cmd); 1314 return rc; 1315 } else if (cmd->unsolicited_data) 1316 iscsit_set_unsoliticed_dataout(cmd); 1317 1318 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1319 /* 1320 * Immediate Data failed DataCRC and ERL>=1, 1321 * silently drop this PDU and let the initiator 1322 * plug the CmdSN gap. 1323 * 1324 * FIXME: Send Unsolicited NOPIN with reserved 1325 * TTT here to help the initiator figure out 1326 * the missing CmdSN, although they should be 1327 * intelligent enough to determine the missing 1328 * CmdSN and issue a retry to plug the sequence. 1329 */ 1330 cmd->i_state = ISTATE_REMOVE; 1331 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1332 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1333 return -1; 1334 1335 return 0; 1336 } 1337 1338 static int 1339 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1340 unsigned char *buf) 1341 { 1342 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1343 int rc, immed_data; 1344 bool dump_payload = false; 1345 1346 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1347 if (rc < 0) 1348 return 0; 1349 /* 1350 * Allocation iovecs needed for struct socket operations for 1351 * traditional iSCSI block I/O. 1352 */ 1353 if (iscsit_allocate_iovecs(cmd) < 0) { 1354 return iscsit_reject_cmd(cmd, 1355 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1356 } 1357 immed_data = cmd->immediate_data; 1358 1359 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1360 if (rc < 0) 1361 return rc; 1362 else if (rc > 0) 1363 dump_payload = true; 1364 1365 if (!immed_data) 1366 return 0; 1367 1368 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1369 } 1370 1371 static u32 iscsit_do_crypto_hash_sg( 1372 struct ahash_request *hash, 1373 struct iscsi_cmd *cmd, 1374 u32 data_offset, 1375 u32 data_length, 1376 u32 padding, 1377 u8 *pad_bytes) 1378 { 1379 u32 data_crc; 1380 struct scatterlist *sg; 1381 unsigned int page_off; 1382 1383 crypto_ahash_init(hash); 1384 1385 sg = cmd->first_data_sg; 1386 page_off = cmd->first_data_sg_off; 1387 1388 while (data_length) { 1389 u32 cur_len = min_t(u32, data_length, (sg->length - page_off)); 1390 1391 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1392 crypto_ahash_update(hash); 1393 1394 data_length -= cur_len; 1395 page_off = 0; 1396 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1397 sg = sg_next(sg); 1398 } 1399 1400 if (padding) { 1401 struct scatterlist pad_sg; 1402 1403 sg_init_one(&pad_sg, pad_bytes, padding); 1404 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1405 padding); 1406 crypto_ahash_finup(hash); 1407 } else { 1408 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1409 crypto_ahash_final(hash); 1410 } 1411 1412 return data_crc; 1413 } 1414 1415 static void iscsit_do_crypto_hash_buf( 1416 struct ahash_request *hash, 1417 const void *buf, 1418 u32 payload_length, 1419 u32 padding, 1420 u8 *pad_bytes, 1421 u8 *data_crc) 1422 { 1423 struct scatterlist sg[2]; 1424 1425 sg_init_table(sg, ARRAY_SIZE(sg)); 1426 sg_set_buf(sg, buf, payload_length); 1427 sg_set_buf(sg + 1, pad_bytes, padding); 1428 1429 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1430 1431 crypto_ahash_digest(hash); 1432 } 1433 1434 int 1435 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1436 struct iscsi_cmd *cmd, u32 payload_length, 1437 bool *success) 1438 { 1439 struct iscsi_data *hdr = buf; 1440 struct se_cmd *se_cmd; 1441 int rc; 1442 1443 /* iSCSI write */ 1444 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1445 1446 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1447 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1448 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1449 payload_length, conn->cid); 1450 1451 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1452 pr_err("Command ITT: 0x%08x received DataOUT after" 1453 " last DataOUT received, dumping payload\n", 1454 cmd->init_task_tag); 1455 return iscsit_dump_data_payload(conn, payload_length, 1); 1456 } 1457 1458 if (cmd->data_direction != DMA_TO_DEVICE) { 1459 pr_err("Command ITT: 0x%08x received DataOUT for a" 1460 " NON-WRITE command.\n", cmd->init_task_tag); 1461 return iscsit_dump_data_payload(conn, payload_length, 1); 1462 } 1463 se_cmd = &cmd->se_cmd; 1464 iscsit_mod_dataout_timer(cmd); 1465 1466 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1467 pr_err("DataOut Offset: %u, Length %u greater than" 1468 " iSCSI Command EDTL %u, protocol error.\n", 1469 hdr->offset, payload_length, cmd->se_cmd.data_length); 1470 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1471 } 1472 1473 if (cmd->unsolicited_data) { 1474 int dump_unsolicited_data = 0; 1475 1476 if (conn->sess->sess_ops->InitialR2T) { 1477 pr_err("Received unexpected unsolicited data" 1478 " while InitialR2T=Yes, protocol error.\n"); 1479 transport_send_check_condition_and_sense(&cmd->se_cmd, 1480 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1481 return -1; 1482 } 1483 /* 1484 * Special case for dealing with Unsolicited DataOUT 1485 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1486 * failures; 1487 */ 1488 1489 /* Something's amiss if we're not in WRITE_PENDING state... */ 1490 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1491 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1492 dump_unsolicited_data = 1; 1493 1494 if (dump_unsolicited_data) { 1495 /* 1496 * Check if a delayed TASK_ABORTED status needs to 1497 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1498 * received with the unsolicited data out. 1499 */ 1500 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1501 iscsit_stop_dataout_timer(cmd); 1502 1503 transport_check_aborted_status(se_cmd, 1504 (hdr->flags & ISCSI_FLAG_CMD_FINAL)); 1505 return iscsit_dump_data_payload(conn, payload_length, 1); 1506 } 1507 } else { 1508 /* 1509 * For the normal solicited data path: 1510 * 1511 * Check for a delayed TASK_ABORTED status and dump any 1512 * incoming data out payload if one exists. Also, when the 1513 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1514 * data out sequence, we decrement outstanding_r2ts. Once 1515 * outstanding_r2ts reaches zero, go ahead and send the delayed 1516 * TASK_ABORTED status. 1517 */ 1518 if (se_cmd->transport_state & CMD_T_ABORTED) { 1519 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1520 if (--cmd->outstanding_r2ts < 1) { 1521 iscsit_stop_dataout_timer(cmd); 1522 transport_check_aborted_status( 1523 se_cmd, 1); 1524 } 1525 1526 return iscsit_dump_data_payload(conn, payload_length, 1); 1527 } 1528 } 1529 /* 1530 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1531 * within-command recovery checks before receiving the payload. 1532 */ 1533 rc = iscsit_check_pre_dataout(cmd, buf); 1534 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1535 return 0; 1536 else if (rc == DATAOUT_CANNOT_RECOVER) 1537 return -1; 1538 *success = true; 1539 return 0; 1540 } 1541 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1542 1543 int 1544 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1545 struct iscsi_cmd **out_cmd) 1546 { 1547 struct iscsi_data *hdr = buf; 1548 struct iscsi_cmd *cmd; 1549 u32 payload_length = ntoh24(hdr->dlength); 1550 int rc; 1551 bool success = false; 1552 1553 if (!payload_length) { 1554 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1555 return 0; 1556 } 1557 1558 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1559 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1560 " MaxXmitDataSegmentLength: %u\n", payload_length, 1561 conn->conn_ops->MaxXmitDataSegmentLength); 1562 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1563 } 1564 1565 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1566 if (!cmd) 1567 return 0; 1568 1569 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1570 1571 if (success) 1572 *out_cmd = cmd; 1573 1574 return rc; 1575 } 1576 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1577 1578 static int 1579 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1580 struct iscsi_data *hdr) 1581 { 1582 struct kvec *iov; 1583 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1584 u32 payload_length = ntoh24(hdr->dlength); 1585 int iov_ret, data_crc_failed = 0; 1586 1587 rx_size += payload_length; 1588 iov = &cmd->iov_data[0]; 1589 1590 iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset), 1591 payload_length); 1592 if (iov_ret < 0) 1593 return -1; 1594 1595 iov_count += iov_ret; 1596 1597 padding = ((-payload_length) & 3); 1598 if (padding != 0) { 1599 iov[iov_count].iov_base = cmd->pad_bytes; 1600 iov[iov_count++].iov_len = padding; 1601 rx_size += padding; 1602 pr_debug("Receiving %u padding bytes.\n", padding); 1603 } 1604 1605 if (conn->conn_ops->DataDigest) { 1606 iov[iov_count].iov_base = &checksum; 1607 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1608 rx_size += ISCSI_CRC_LEN; 1609 } 1610 1611 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1612 1613 iscsit_unmap_iovec(cmd); 1614 1615 if (rx_got != rx_size) 1616 return -1; 1617 1618 if (conn->conn_ops->DataDigest) { 1619 u32 data_crc; 1620 1621 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1622 be32_to_cpu(hdr->offset), 1623 payload_length, padding, 1624 cmd->pad_bytes); 1625 1626 if (checksum != data_crc) { 1627 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1628 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1629 " does not match computed 0x%08x\n", 1630 hdr->itt, hdr->offset, payload_length, 1631 hdr->datasn, checksum, data_crc); 1632 data_crc_failed = 1; 1633 } else { 1634 pr_debug("Got CRC32C DataDigest 0x%08x for" 1635 " %u bytes of Data Out\n", checksum, 1636 payload_length); 1637 } 1638 } 1639 1640 return data_crc_failed; 1641 } 1642 1643 int 1644 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1645 bool data_crc_failed) 1646 { 1647 struct iscsi_conn *conn = cmd->conn; 1648 int rc, ooo_cmdsn; 1649 /* 1650 * Increment post receive data and CRC values or perform 1651 * within-command recovery. 1652 */ 1653 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1654 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1655 return 0; 1656 else if (rc == DATAOUT_SEND_R2T) { 1657 iscsit_set_dataout_sequence_values(cmd); 1658 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1659 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1660 /* 1661 * Handle extra special case for out of order 1662 * Unsolicited Data Out. 1663 */ 1664 spin_lock_bh(&cmd->istate_lock); 1665 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1666 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1667 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1668 spin_unlock_bh(&cmd->istate_lock); 1669 1670 iscsit_stop_dataout_timer(cmd); 1671 if (ooo_cmdsn) 1672 return 0; 1673 target_execute_cmd(&cmd->se_cmd); 1674 return 0; 1675 } else /* DATAOUT_CANNOT_RECOVER */ 1676 return -1; 1677 1678 return 0; 1679 } 1680 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1681 1682 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1683 { 1684 struct iscsi_cmd *cmd = NULL; 1685 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1686 int rc; 1687 bool data_crc_failed = false; 1688 1689 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1690 if (rc < 0) 1691 return 0; 1692 else if (!cmd) 1693 return 0; 1694 1695 rc = iscsit_get_dataout(conn, cmd, hdr); 1696 if (rc < 0) 1697 return rc; 1698 else if (rc > 0) 1699 data_crc_failed = true; 1700 1701 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1702 } 1703 1704 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1705 struct iscsi_nopout *hdr) 1706 { 1707 u32 payload_length = ntoh24(hdr->dlength); 1708 1709 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1710 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1711 if (!cmd) 1712 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1713 (unsigned char *)hdr); 1714 1715 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1716 (unsigned char *)hdr); 1717 } 1718 1719 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1720 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1721 " not set, protocol error.\n"); 1722 if (!cmd) 1723 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1724 (unsigned char *)hdr); 1725 1726 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1727 (unsigned char *)hdr); 1728 } 1729 1730 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1731 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1732 " greater than MaxXmitDataSegmentLength: %u, protocol" 1733 " error.\n", payload_length, 1734 conn->conn_ops->MaxXmitDataSegmentLength); 1735 if (!cmd) 1736 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1737 (unsigned char *)hdr); 1738 1739 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1740 (unsigned char *)hdr); 1741 } 1742 1743 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1744 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1745 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1746 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1747 payload_length); 1748 /* 1749 * This is not a response to a Unsolicited NopIN, which means 1750 * it can either be a NOPOUT ping request (with a valid ITT), 1751 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1752 * Either way, make sure we allocate an struct iscsi_cmd, as both 1753 * can contain ping data. 1754 */ 1755 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1756 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1757 cmd->i_state = ISTATE_SEND_NOPIN; 1758 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1759 1 : 0); 1760 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1761 cmd->targ_xfer_tag = 0xFFFFFFFF; 1762 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1763 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1764 cmd->data_direction = DMA_NONE; 1765 } 1766 1767 return 0; 1768 } 1769 EXPORT_SYMBOL(iscsit_setup_nop_out); 1770 1771 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1772 struct iscsi_nopout *hdr) 1773 { 1774 struct iscsi_cmd *cmd_p = NULL; 1775 int cmdsn_ret = 0; 1776 /* 1777 * Initiator is expecting a NopIN ping reply.. 1778 */ 1779 if (hdr->itt != RESERVED_ITT) { 1780 if (!cmd) 1781 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1782 (unsigned char *)hdr); 1783 1784 spin_lock_bh(&conn->cmd_lock); 1785 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1786 spin_unlock_bh(&conn->cmd_lock); 1787 1788 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1789 1790 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1791 iscsit_add_cmd_to_response_queue(cmd, conn, 1792 cmd->i_state); 1793 return 0; 1794 } 1795 1796 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1797 (unsigned char *)hdr, hdr->cmdsn); 1798 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1799 return 0; 1800 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1801 return -1; 1802 1803 return 0; 1804 } 1805 /* 1806 * This was a response to a unsolicited NOPIN ping. 1807 */ 1808 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1809 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1810 if (!cmd_p) 1811 return -EINVAL; 1812 1813 iscsit_stop_nopin_response_timer(conn); 1814 1815 cmd_p->i_state = ISTATE_REMOVE; 1816 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1817 1818 iscsit_start_nopin_timer(conn); 1819 return 0; 1820 } 1821 /* 1822 * Otherwise, initiator is not expecting a NOPIN is response. 1823 * Just ignore for now. 1824 */ 1825 1826 if (cmd) 1827 iscsit_free_cmd(cmd, false); 1828 1829 return 0; 1830 } 1831 EXPORT_SYMBOL(iscsit_process_nop_out); 1832 1833 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1834 unsigned char *buf) 1835 { 1836 unsigned char *ping_data = NULL; 1837 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1838 struct kvec *iov = NULL; 1839 u32 payload_length = ntoh24(hdr->dlength); 1840 int ret; 1841 1842 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1843 if (ret < 0) 1844 return 0; 1845 /* 1846 * Handle NOP-OUT payload for traditional iSCSI sockets 1847 */ 1848 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1849 u32 checksum, data_crc, padding = 0; 1850 int niov = 0, rx_got, rx_size = payload_length; 1851 1852 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1853 if (!ping_data) { 1854 pr_err("Unable to allocate memory for" 1855 " NOPOUT ping data.\n"); 1856 ret = -1; 1857 goto out; 1858 } 1859 1860 iov = &cmd->iov_misc[0]; 1861 iov[niov].iov_base = ping_data; 1862 iov[niov++].iov_len = payload_length; 1863 1864 padding = ((-payload_length) & 3); 1865 if (padding != 0) { 1866 pr_debug("Receiving %u additional bytes" 1867 " for padding.\n", padding); 1868 iov[niov].iov_base = &cmd->pad_bytes; 1869 iov[niov++].iov_len = padding; 1870 rx_size += padding; 1871 } 1872 if (conn->conn_ops->DataDigest) { 1873 iov[niov].iov_base = &checksum; 1874 iov[niov++].iov_len = ISCSI_CRC_LEN; 1875 rx_size += ISCSI_CRC_LEN; 1876 } 1877 1878 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1879 if (rx_got != rx_size) { 1880 ret = -1; 1881 goto out; 1882 } 1883 1884 if (conn->conn_ops->DataDigest) { 1885 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 1886 ping_data, payload_length, 1887 padding, cmd->pad_bytes, 1888 (u8 *)&data_crc); 1889 1890 if (checksum != data_crc) { 1891 pr_err("Ping data CRC32C DataDigest" 1892 " 0x%08x does not match computed 0x%08x\n", 1893 checksum, data_crc); 1894 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1895 pr_err("Unable to recover from" 1896 " NOPOUT Ping DataCRC failure while in" 1897 " ERL=0.\n"); 1898 ret = -1; 1899 goto out; 1900 } else { 1901 /* 1902 * Silently drop this PDU and let the 1903 * initiator plug the CmdSN gap. 1904 */ 1905 pr_debug("Dropping NOPOUT" 1906 " Command CmdSN: 0x%08x due to" 1907 " DataCRC error.\n", hdr->cmdsn); 1908 ret = 0; 1909 goto out; 1910 } 1911 } else { 1912 pr_debug("Got CRC32C DataDigest" 1913 " 0x%08x for %u bytes of ping data.\n", 1914 checksum, payload_length); 1915 } 1916 } 1917 1918 ping_data[payload_length] = '\0'; 1919 /* 1920 * Attach ping data to struct iscsi_cmd->buf_ptr. 1921 */ 1922 cmd->buf_ptr = ping_data; 1923 cmd->buf_ptr_size = payload_length; 1924 1925 pr_debug("Got %u bytes of NOPOUT ping" 1926 " data.\n", payload_length); 1927 pr_debug("Ping Data: \"%s\"\n", ping_data); 1928 } 1929 1930 return iscsit_process_nop_out(conn, cmd, hdr); 1931 out: 1932 if (cmd) 1933 iscsit_free_cmd(cmd, false); 1934 1935 kfree(ping_data); 1936 return ret; 1937 } 1938 1939 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1940 { 1941 switch (iscsi_tmf) { 1942 case ISCSI_TM_FUNC_ABORT_TASK: 1943 return TMR_ABORT_TASK; 1944 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1945 return TMR_ABORT_TASK_SET; 1946 case ISCSI_TM_FUNC_CLEAR_ACA: 1947 return TMR_CLEAR_ACA; 1948 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1949 return TMR_CLEAR_TASK_SET; 1950 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1951 return TMR_LUN_RESET; 1952 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1953 return TMR_TARGET_WARM_RESET; 1954 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1955 return TMR_TARGET_COLD_RESET; 1956 default: 1957 return TMR_UNKNOWN; 1958 } 1959 } 1960 1961 int 1962 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1963 unsigned char *buf) 1964 { 1965 struct se_tmr_req *se_tmr; 1966 struct iscsi_tmr_req *tmr_req; 1967 struct iscsi_tm *hdr; 1968 int out_of_order_cmdsn = 0, ret; 1969 bool sess_ref = false; 1970 u8 function, tcm_function = TMR_UNKNOWN; 1971 1972 hdr = (struct iscsi_tm *) buf; 1973 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1974 function = hdr->flags; 1975 1976 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1977 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1978 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1979 hdr->rtt, hdr->refcmdsn, conn->cid); 1980 1981 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1982 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1983 hdr->rtt != RESERVED_ITT)) { 1984 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1985 hdr->rtt = RESERVED_ITT; 1986 } 1987 1988 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1989 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1990 pr_err("Task Management Request TASK_REASSIGN not" 1991 " issued as immediate command, bad iSCSI Initiator" 1992 "implementation\n"); 1993 return iscsit_add_reject_cmd(cmd, 1994 ISCSI_REASON_PROTOCOL_ERROR, buf); 1995 } 1996 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1997 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 1998 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 1999 2000 cmd->data_direction = DMA_NONE; 2001 2002 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 2003 if (!cmd->tmr_req) { 2004 pr_err("Unable to allocate memory for" 2005 " Task Management command!\n"); 2006 return iscsit_add_reject_cmd(cmd, 2007 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2008 buf); 2009 } 2010 2011 /* 2012 * TASK_REASSIGN for ERL=2 / connection stays inside of 2013 * LIO-Target $FABRIC_MOD 2014 */ 2015 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2016 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 2017 conn->sess->se_sess, 0, DMA_NONE, 2018 TCM_SIMPLE_TAG, cmd->sense_buffer + 2); 2019 2020 target_get_sess_cmd(&cmd->se_cmd, true); 2021 sess_ref = true; 2022 tcm_function = iscsit_convert_tmf(function); 2023 if (tcm_function == TMR_UNKNOWN) { 2024 pr_err("Unknown iSCSI TMR Function:" 2025 " 0x%02x\n", function); 2026 return iscsit_add_reject_cmd(cmd, 2027 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2028 } 2029 } 2030 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2031 GFP_KERNEL); 2032 if (ret < 0) 2033 return iscsit_add_reject_cmd(cmd, 2034 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2035 2036 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2037 2038 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2039 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2040 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2041 cmd->init_task_tag = hdr->itt; 2042 cmd->targ_xfer_tag = 0xFFFFFFFF; 2043 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2044 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2045 se_tmr = cmd->se_cmd.se_tmr_req; 2046 tmr_req = cmd->tmr_req; 2047 /* 2048 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2049 */ 2050 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2051 ret = transport_lookup_tmr_lun(&cmd->se_cmd, 2052 scsilun_to_int(&hdr->lun)); 2053 if (ret < 0) { 2054 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2055 goto attach; 2056 } 2057 } 2058 2059 switch (function) { 2060 case ISCSI_TM_FUNC_ABORT_TASK: 2061 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2062 if (se_tmr->response) 2063 goto attach; 2064 break; 2065 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2066 case ISCSI_TM_FUNC_CLEAR_ACA: 2067 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2068 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2069 break; 2070 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2071 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2072 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2073 goto attach; 2074 } 2075 break; 2076 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2077 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2078 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2079 goto attach; 2080 } 2081 break; 2082 case ISCSI_TM_FUNC_TASK_REASSIGN: 2083 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2084 /* 2085 * Perform sanity checks on the ExpDataSN only if the 2086 * TASK_REASSIGN was successful. 2087 */ 2088 if (se_tmr->response) 2089 break; 2090 2091 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2092 return iscsit_add_reject_cmd(cmd, 2093 ISCSI_REASON_BOOKMARK_INVALID, buf); 2094 break; 2095 default: 2096 pr_err("Unknown TMR function: 0x%02x, protocol" 2097 " error.\n", function); 2098 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2099 goto attach; 2100 } 2101 2102 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2103 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2104 se_tmr->call_transport = 1; 2105 attach: 2106 spin_lock_bh(&conn->cmd_lock); 2107 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2108 spin_unlock_bh(&conn->cmd_lock); 2109 2110 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2111 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2112 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) 2113 out_of_order_cmdsn = 1; 2114 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2115 return 0; 2116 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2117 return -1; 2118 } 2119 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2120 2121 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2122 return 0; 2123 /* 2124 * Found the referenced task, send to transport for processing. 2125 */ 2126 if (se_tmr->call_transport) 2127 return transport_generic_handle_tmr(&cmd->se_cmd); 2128 2129 /* 2130 * Could not find the referenced LUN, task, or Task Management 2131 * command not authorized or supported. Change state and 2132 * let the tx_thread send the response. 2133 * 2134 * For connection recovery, this is also the default action for 2135 * TMR TASK_REASSIGN. 2136 */ 2137 if (sess_ref) { 2138 pr_debug("Handle TMR, using sess_ref=true check\n"); 2139 target_put_sess_cmd(&cmd->se_cmd); 2140 } 2141 2142 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2143 return 0; 2144 } 2145 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2146 2147 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2148 int 2149 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2150 struct iscsi_text *hdr) 2151 { 2152 u32 payload_length = ntoh24(hdr->dlength); 2153 2154 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2155 pr_err("Unable to accept text parameter length: %u" 2156 "greater than MaxXmitDataSegmentLength %u.\n", 2157 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2158 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2159 (unsigned char *)hdr); 2160 } 2161 2162 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2163 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2164 pr_err("Multi sequence text commands currently not supported\n"); 2165 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2166 (unsigned char *)hdr); 2167 } 2168 2169 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2170 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2171 hdr->exp_statsn, payload_length); 2172 2173 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2174 cmd->i_state = ISTATE_SEND_TEXTRSP; 2175 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2176 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2177 cmd->targ_xfer_tag = 0xFFFFFFFF; 2178 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2179 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2180 cmd->data_direction = DMA_NONE; 2181 cmd->text_in_ptr = NULL; 2182 2183 return 0; 2184 } 2185 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2186 2187 int 2188 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2189 struct iscsi_text *hdr) 2190 { 2191 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2192 int cmdsn_ret; 2193 2194 if (!text_in) { 2195 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2196 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2197 pr_err("Unable to locate text_in buffer for sendtargets" 2198 " discovery\n"); 2199 goto reject; 2200 } 2201 goto empty_sendtargets; 2202 } 2203 if (strncmp("SendTargets", text_in, 11) != 0) { 2204 pr_err("Received Text Data that is not" 2205 " SendTargets, cannot continue.\n"); 2206 goto reject; 2207 } 2208 text_ptr = strchr(text_in, '='); 2209 if (!text_ptr) { 2210 pr_err("No \"=\" separator found in Text Data," 2211 " cannot continue.\n"); 2212 goto reject; 2213 } 2214 if (!strncmp("=All", text_ptr, 4)) { 2215 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2216 } else if (!strncmp("=iqn.", text_ptr, 5) || 2217 !strncmp("=eui.", text_ptr, 5)) { 2218 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2219 } else { 2220 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr); 2221 goto reject; 2222 } 2223 2224 spin_lock_bh(&conn->cmd_lock); 2225 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2226 spin_unlock_bh(&conn->cmd_lock); 2227 2228 empty_sendtargets: 2229 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2230 2231 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2233 (unsigned char *)hdr, hdr->cmdsn); 2234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2235 return -1; 2236 2237 return 0; 2238 } 2239 2240 return iscsit_execute_cmd(cmd, 0); 2241 2242 reject: 2243 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2244 (unsigned char *)hdr); 2245 } 2246 EXPORT_SYMBOL(iscsit_process_text_cmd); 2247 2248 static int 2249 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2250 unsigned char *buf) 2251 { 2252 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2253 char *text_in = NULL; 2254 u32 payload_length = ntoh24(hdr->dlength); 2255 int rx_size, rc; 2256 2257 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2258 if (rc < 0) 2259 return 0; 2260 2261 rx_size = payload_length; 2262 if (payload_length) { 2263 u32 checksum = 0, data_crc = 0; 2264 u32 padding = 0, pad_bytes = 0; 2265 int niov = 0, rx_got; 2266 struct kvec iov[3]; 2267 2268 text_in = kzalloc(payload_length, GFP_KERNEL); 2269 if (!text_in) { 2270 pr_err("Unable to allocate memory for" 2271 " incoming text parameters\n"); 2272 goto reject; 2273 } 2274 cmd->text_in_ptr = text_in; 2275 2276 memset(iov, 0, 3 * sizeof(struct kvec)); 2277 iov[niov].iov_base = text_in; 2278 iov[niov++].iov_len = payload_length; 2279 2280 padding = ((-payload_length) & 3); 2281 if (padding != 0) { 2282 iov[niov].iov_base = &pad_bytes; 2283 iov[niov++].iov_len = padding; 2284 rx_size += padding; 2285 pr_debug("Receiving %u additional bytes" 2286 " for padding.\n", padding); 2287 } 2288 if (conn->conn_ops->DataDigest) { 2289 iov[niov].iov_base = &checksum; 2290 iov[niov++].iov_len = ISCSI_CRC_LEN; 2291 rx_size += ISCSI_CRC_LEN; 2292 } 2293 2294 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2295 if (rx_got != rx_size) 2296 goto reject; 2297 2298 if (conn->conn_ops->DataDigest) { 2299 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2300 text_in, payload_length, 2301 padding, (u8 *)&pad_bytes, 2302 (u8 *)&data_crc); 2303 2304 if (checksum != data_crc) { 2305 pr_err("Text data CRC32C DataDigest" 2306 " 0x%08x does not match computed" 2307 " 0x%08x\n", checksum, data_crc); 2308 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2309 pr_err("Unable to recover from" 2310 " Text Data digest failure while in" 2311 " ERL=0.\n"); 2312 goto reject; 2313 } else { 2314 /* 2315 * Silently drop this PDU and let the 2316 * initiator plug the CmdSN gap. 2317 */ 2318 pr_debug("Dropping Text" 2319 " Command CmdSN: 0x%08x due to" 2320 " DataCRC error.\n", hdr->cmdsn); 2321 kfree(text_in); 2322 return 0; 2323 } 2324 } else { 2325 pr_debug("Got CRC32C DataDigest" 2326 " 0x%08x for %u bytes of text data.\n", 2327 checksum, payload_length); 2328 } 2329 } 2330 text_in[payload_length - 1] = '\0'; 2331 pr_debug("Successfully read %d bytes of text" 2332 " data.\n", payload_length); 2333 } 2334 2335 return iscsit_process_text_cmd(conn, cmd, hdr); 2336 2337 reject: 2338 kfree(cmd->text_in_ptr); 2339 cmd->text_in_ptr = NULL; 2340 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2341 } 2342 2343 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2344 { 2345 struct iscsi_conn *conn_p; 2346 struct iscsi_session *sess = conn->sess; 2347 2348 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2349 " for SID: %u.\n", conn->cid, conn->sess->sid); 2350 2351 atomic_set(&sess->session_logout, 1); 2352 atomic_set(&conn->conn_logout_remove, 1); 2353 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2354 2355 iscsit_inc_conn_usage_count(conn); 2356 iscsit_inc_session_usage_count(sess); 2357 2358 spin_lock_bh(&sess->conn_lock); 2359 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2360 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2361 continue; 2362 2363 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2364 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2365 } 2366 spin_unlock_bh(&sess->conn_lock); 2367 2368 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2369 2370 return 0; 2371 } 2372 2373 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2374 { 2375 struct iscsi_conn *l_conn; 2376 struct iscsi_session *sess = conn->sess; 2377 2378 pr_debug("Received logout request CLOSECONNECTION for CID:" 2379 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2380 2381 /* 2382 * A Logout Request with a CLOSECONNECTION reason code for a CID 2383 * can arrive on a connection with a differing CID. 2384 */ 2385 if (conn->cid == cmd->logout_cid) { 2386 spin_lock_bh(&conn->state_lock); 2387 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2388 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2389 2390 atomic_set(&conn->conn_logout_remove, 1); 2391 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2392 iscsit_inc_conn_usage_count(conn); 2393 2394 spin_unlock_bh(&conn->state_lock); 2395 } else { 2396 /* 2397 * Handle all different cid CLOSECONNECTION requests in 2398 * iscsit_logout_post_handler_diffcid() as to give enough 2399 * time for any non immediate command's CmdSN to be 2400 * acknowledged on the connection in question. 2401 * 2402 * Here we simply make sure the CID is still around. 2403 */ 2404 l_conn = iscsit_get_conn_from_cid(sess, 2405 cmd->logout_cid); 2406 if (!l_conn) { 2407 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2408 iscsit_add_cmd_to_response_queue(cmd, conn, 2409 cmd->i_state); 2410 return 0; 2411 } 2412 2413 iscsit_dec_conn_usage_count(l_conn); 2414 } 2415 2416 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2417 2418 return 0; 2419 } 2420 2421 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2422 { 2423 struct iscsi_session *sess = conn->sess; 2424 2425 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2426 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2427 2428 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2429 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2430 " while ERL!=2.\n"); 2431 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2432 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2433 return 0; 2434 } 2435 2436 if (conn->cid == cmd->logout_cid) { 2437 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2438 " with CID: %hu on CID: %hu, implementation error.\n", 2439 cmd->logout_cid, conn->cid); 2440 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2441 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2442 return 0; 2443 } 2444 2445 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2446 2447 return 0; 2448 } 2449 2450 int 2451 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2452 unsigned char *buf) 2453 { 2454 int cmdsn_ret, logout_remove = 0; 2455 u8 reason_code = 0; 2456 struct iscsi_logout *hdr; 2457 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2458 2459 hdr = (struct iscsi_logout *) buf; 2460 reason_code = (hdr->flags & 0x7f); 2461 2462 if (tiqn) { 2463 spin_lock(&tiqn->logout_stats.lock); 2464 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2465 tiqn->logout_stats.normal_logouts++; 2466 else 2467 tiqn->logout_stats.abnormal_logouts++; 2468 spin_unlock(&tiqn->logout_stats.lock); 2469 } 2470 2471 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2472 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2473 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2474 hdr->cid, conn->cid); 2475 2476 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2477 pr_err("Received logout request on connection that" 2478 " is not in logged in state, ignoring request.\n"); 2479 iscsit_free_cmd(cmd, false); 2480 return 0; 2481 } 2482 2483 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2484 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2485 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2486 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2487 cmd->targ_xfer_tag = 0xFFFFFFFF; 2488 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2489 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2490 cmd->logout_cid = be16_to_cpu(hdr->cid); 2491 cmd->logout_reason = reason_code; 2492 cmd->data_direction = DMA_NONE; 2493 2494 /* 2495 * We need to sleep in these cases (by returning 1) until the Logout 2496 * Response gets sent in the tx thread. 2497 */ 2498 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2499 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2500 be16_to_cpu(hdr->cid) == conn->cid)) 2501 logout_remove = 1; 2502 2503 spin_lock_bh(&conn->cmd_lock); 2504 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2505 spin_unlock_bh(&conn->cmd_lock); 2506 2507 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2508 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2509 2510 /* 2511 * Immediate commands are executed, well, immediately. 2512 * Non-Immediate Logout Commands are executed in CmdSN order. 2513 */ 2514 if (cmd->immediate_cmd) { 2515 int ret = iscsit_execute_cmd(cmd, 0); 2516 2517 if (ret < 0) 2518 return ret; 2519 } else { 2520 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2521 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2522 logout_remove = 0; 2523 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2524 return -1; 2525 } 2526 2527 return logout_remove; 2528 } 2529 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2530 2531 int iscsit_handle_snack( 2532 struct iscsi_conn *conn, 2533 unsigned char *buf) 2534 { 2535 struct iscsi_snack *hdr; 2536 2537 hdr = (struct iscsi_snack *) buf; 2538 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2539 2540 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2541 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2542 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2543 hdr->begrun, hdr->runlength, conn->cid); 2544 2545 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2546 pr_err("Initiator sent SNACK request while in" 2547 " ErrorRecoveryLevel=0.\n"); 2548 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2549 buf); 2550 } 2551 /* 2552 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2553 * call from inside iscsi_send_recovery_datain_or_r2t(). 2554 */ 2555 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2556 case 0: 2557 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2558 hdr->itt, 2559 be32_to_cpu(hdr->ttt), 2560 be32_to_cpu(hdr->begrun), 2561 be32_to_cpu(hdr->runlength)); 2562 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2563 return iscsit_handle_status_snack(conn, hdr->itt, 2564 be32_to_cpu(hdr->ttt), 2565 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2566 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2567 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2568 be32_to_cpu(hdr->begrun), 2569 be32_to_cpu(hdr->runlength)); 2570 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2571 /* FIXME: Support R-Data SNACK */ 2572 pr_err("R-Data SNACK Not Supported.\n"); 2573 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2574 buf); 2575 default: 2576 pr_err("Unknown SNACK type 0x%02x, protocol" 2577 " error.\n", hdr->flags & 0x0f); 2578 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2579 buf); 2580 } 2581 2582 return 0; 2583 } 2584 EXPORT_SYMBOL(iscsit_handle_snack); 2585 2586 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2587 { 2588 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2589 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2590 wait_for_completion_interruptible_timeout( 2591 &conn->rx_half_close_comp, 2592 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2593 } 2594 } 2595 2596 static int iscsit_handle_immediate_data( 2597 struct iscsi_cmd *cmd, 2598 struct iscsi_scsi_req *hdr, 2599 u32 length) 2600 { 2601 int iov_ret, rx_got = 0, rx_size = 0; 2602 u32 checksum, iov_count = 0, padding = 0; 2603 struct iscsi_conn *conn = cmd->conn; 2604 struct kvec *iov; 2605 2606 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length); 2607 if (iov_ret < 0) 2608 return IMMEDIATE_DATA_CANNOT_RECOVER; 2609 2610 rx_size = length; 2611 iov_count = iov_ret; 2612 iov = &cmd->iov_data[0]; 2613 2614 padding = ((-length) & 3); 2615 if (padding != 0) { 2616 iov[iov_count].iov_base = cmd->pad_bytes; 2617 iov[iov_count++].iov_len = padding; 2618 rx_size += padding; 2619 } 2620 2621 if (conn->conn_ops->DataDigest) { 2622 iov[iov_count].iov_base = &checksum; 2623 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2624 rx_size += ISCSI_CRC_LEN; 2625 } 2626 2627 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2628 2629 iscsit_unmap_iovec(cmd); 2630 2631 if (rx_got != rx_size) { 2632 iscsit_rx_thread_wait_for_tcp(conn); 2633 return IMMEDIATE_DATA_CANNOT_RECOVER; 2634 } 2635 2636 if (conn->conn_ops->DataDigest) { 2637 u32 data_crc; 2638 2639 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2640 cmd->write_data_done, length, padding, 2641 cmd->pad_bytes); 2642 2643 if (checksum != data_crc) { 2644 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2645 " does not match computed 0x%08x\n", checksum, 2646 data_crc); 2647 2648 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2649 pr_err("Unable to recover from" 2650 " Immediate Data digest failure while" 2651 " in ERL=0.\n"); 2652 iscsit_reject_cmd(cmd, 2653 ISCSI_REASON_DATA_DIGEST_ERROR, 2654 (unsigned char *)hdr); 2655 return IMMEDIATE_DATA_CANNOT_RECOVER; 2656 } else { 2657 iscsit_reject_cmd(cmd, 2658 ISCSI_REASON_DATA_DIGEST_ERROR, 2659 (unsigned char *)hdr); 2660 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2661 } 2662 } else { 2663 pr_debug("Got CRC32C DataDigest 0x%08x for" 2664 " %u bytes of Immediate Data\n", checksum, 2665 length); 2666 } 2667 } 2668 2669 cmd->write_data_done += length; 2670 2671 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2672 spin_lock_bh(&cmd->istate_lock); 2673 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2674 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2675 spin_unlock_bh(&cmd->istate_lock); 2676 } 2677 2678 return IMMEDIATE_DATA_NORMAL_OPERATION; 2679 } 2680 2681 /* 2682 * Called with sess->conn_lock held. 2683 */ 2684 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2685 with active network interface */ 2686 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2687 { 2688 struct iscsi_cmd *cmd; 2689 struct iscsi_conn *conn_p; 2690 bool found = false; 2691 2692 /* 2693 * Only send a Asynchronous Message on connections whos network 2694 * interface is still functional. 2695 */ 2696 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2697 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2698 iscsit_inc_conn_usage_count(conn_p); 2699 found = true; 2700 break; 2701 } 2702 } 2703 2704 if (!found) 2705 return; 2706 2707 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2708 if (!cmd) { 2709 iscsit_dec_conn_usage_count(conn_p); 2710 return; 2711 } 2712 2713 cmd->logout_cid = conn->cid; 2714 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2715 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2716 2717 spin_lock_bh(&conn_p->cmd_lock); 2718 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2719 spin_unlock_bh(&conn_p->cmd_lock); 2720 2721 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2722 iscsit_dec_conn_usage_count(conn_p); 2723 } 2724 2725 static int iscsit_send_conn_drop_async_message( 2726 struct iscsi_cmd *cmd, 2727 struct iscsi_conn *conn) 2728 { 2729 struct iscsi_async *hdr; 2730 2731 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2732 2733 hdr = (struct iscsi_async *) cmd->pdu; 2734 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2735 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2736 cmd->init_task_tag = RESERVED_ITT; 2737 cmd->targ_xfer_tag = 0xFFFFFFFF; 2738 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2739 cmd->stat_sn = conn->stat_sn++; 2740 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2741 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2742 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2743 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2744 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2745 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2746 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2747 2748 pr_debug("Sending Connection Dropped Async Message StatSN:" 2749 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2750 cmd->logout_cid, conn->cid); 2751 2752 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2753 } 2754 2755 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2756 { 2757 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2758 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2759 wait_for_completion_interruptible_timeout( 2760 &conn->tx_half_close_comp, 2761 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2762 } 2763 } 2764 2765 void 2766 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2767 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2768 bool set_statsn) 2769 { 2770 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2771 hdr->flags = datain->flags; 2772 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2773 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2774 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2775 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2776 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2777 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2778 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2779 } 2780 } 2781 hton24(hdr->dlength, datain->length); 2782 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2783 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2784 (struct scsi_lun *)&hdr->lun); 2785 else 2786 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2787 2788 hdr->itt = cmd->init_task_tag; 2789 2790 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2791 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2792 else 2793 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2794 if (set_statsn) 2795 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2796 else 2797 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2798 2799 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2800 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2801 hdr->datasn = cpu_to_be32(datain->data_sn); 2802 hdr->offset = cpu_to_be32(datain->offset); 2803 2804 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2805 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2806 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2807 ntohl(hdr->offset), datain->length, conn->cid); 2808 } 2809 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2810 2811 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2812 { 2813 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2814 struct iscsi_datain datain; 2815 struct iscsi_datain_req *dr; 2816 int eodr = 0, ret; 2817 bool set_statsn = false; 2818 2819 memset(&datain, 0, sizeof(struct iscsi_datain)); 2820 dr = iscsit_get_datain_values(cmd, &datain); 2821 if (!dr) { 2822 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2823 cmd->init_task_tag); 2824 return -1; 2825 } 2826 /* 2827 * Be paranoid and double check the logic for now. 2828 */ 2829 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2830 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2831 " datain.length: %u exceeds cmd->data_length: %u\n", 2832 cmd->init_task_tag, datain.offset, datain.length, 2833 cmd->se_cmd.data_length); 2834 return -1; 2835 } 2836 2837 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2838 /* 2839 * Special case for successfully execution w/ both DATAIN 2840 * and Sense Data. 2841 */ 2842 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2843 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2844 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2845 else { 2846 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2847 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2848 iscsit_increment_maxcmdsn(cmd, conn->sess); 2849 cmd->stat_sn = conn->stat_sn++; 2850 set_statsn = true; 2851 } else if (dr->dr_complete == 2852 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2853 set_statsn = true; 2854 } 2855 2856 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2857 2858 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2859 if (ret < 0) 2860 return ret; 2861 2862 if (dr->dr_complete) { 2863 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2864 2 : 1; 2865 iscsit_free_datain_req(cmd, dr); 2866 } 2867 2868 return eodr; 2869 } 2870 2871 int 2872 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2873 struct iscsi_logout_rsp *hdr) 2874 { 2875 struct iscsi_conn *logout_conn = NULL; 2876 struct iscsi_conn_recovery *cr = NULL; 2877 struct iscsi_session *sess = conn->sess; 2878 /* 2879 * The actual shutting down of Sessions and/or Connections 2880 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2881 * is done in scsi_logout_post_handler(). 2882 */ 2883 switch (cmd->logout_reason) { 2884 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2885 pr_debug("iSCSI session logout successful, setting" 2886 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2887 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2888 break; 2889 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2890 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2891 break; 2892 /* 2893 * For CLOSECONNECTION logout requests carrying 2894 * a matching logout CID -> local CID, the reference 2895 * for the local CID will have been incremented in 2896 * iscsi_logout_closeconnection(). 2897 * 2898 * For CLOSECONNECTION logout requests carrying 2899 * a different CID than the connection it arrived 2900 * on, the connection responding to cmd->logout_cid 2901 * is stopped in iscsit_logout_post_handler_diffcid(). 2902 */ 2903 2904 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2905 " successful.\n", cmd->logout_cid, conn->cid); 2906 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2907 break; 2908 case ISCSI_LOGOUT_REASON_RECOVERY: 2909 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2910 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2911 break; 2912 /* 2913 * If the connection is still active from our point of view 2914 * force connection recovery to occur. 2915 */ 2916 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2917 cmd->logout_cid); 2918 if (logout_conn) { 2919 iscsit_connection_reinstatement_rcfr(logout_conn); 2920 iscsit_dec_conn_usage_count(logout_conn); 2921 } 2922 2923 cr = iscsit_get_inactive_connection_recovery_entry( 2924 conn->sess, cmd->logout_cid); 2925 if (!cr) { 2926 pr_err("Unable to locate CID: %hu for" 2927 " REMOVECONNFORRECOVERY Logout Request.\n", 2928 cmd->logout_cid); 2929 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2930 break; 2931 } 2932 2933 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2934 2935 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2936 " for recovery for CID: %hu on CID: %hu successful.\n", 2937 cmd->logout_cid, conn->cid); 2938 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2939 break; 2940 default: 2941 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2942 cmd->logout_reason); 2943 return -1; 2944 } 2945 2946 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2947 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2948 hdr->response = cmd->logout_response; 2949 hdr->itt = cmd->init_task_tag; 2950 cmd->stat_sn = conn->stat_sn++; 2951 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2952 2953 iscsit_increment_maxcmdsn(cmd, conn->sess); 2954 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2955 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2956 2957 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2958 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2959 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2960 cmd->logout_cid, conn->cid); 2961 2962 return 0; 2963 } 2964 EXPORT_SYMBOL(iscsit_build_logout_rsp); 2965 2966 static int 2967 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2968 { 2969 int rc; 2970 2971 rc = iscsit_build_logout_rsp(cmd, conn, 2972 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2973 if (rc < 0) 2974 return rc; 2975 2976 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2977 } 2978 2979 void 2980 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2981 struct iscsi_nopin *hdr, bool nopout_response) 2982 { 2983 hdr->opcode = ISCSI_OP_NOOP_IN; 2984 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2985 hton24(hdr->dlength, cmd->buf_ptr_size); 2986 if (nopout_response) 2987 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2988 hdr->itt = cmd->init_task_tag; 2989 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2990 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 2991 conn->stat_sn; 2992 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2993 2994 if (nopout_response) 2995 iscsit_increment_maxcmdsn(cmd, conn->sess); 2996 2997 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2998 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2999 3000 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3001 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3002 "Solicited" : "Unsolicited", cmd->init_task_tag, 3003 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3004 } 3005 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3006 3007 /* 3008 * Unsolicited NOPIN, either requesting a response or not. 3009 */ 3010 static int iscsit_send_unsolicited_nopin( 3011 struct iscsi_cmd *cmd, 3012 struct iscsi_conn *conn, 3013 int want_response) 3014 { 3015 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3016 int ret; 3017 3018 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3019 3020 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3021 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3022 3023 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3024 if (ret < 0) 3025 return ret; 3026 3027 spin_lock_bh(&cmd->istate_lock); 3028 cmd->i_state = want_response ? 3029 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3030 spin_unlock_bh(&cmd->istate_lock); 3031 3032 return 0; 3033 } 3034 3035 static int 3036 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3037 { 3038 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3039 3040 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3041 3042 /* 3043 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3044 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3045 */ 3046 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3047 3048 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3049 cmd->buf_ptr, 3050 cmd->buf_ptr_size); 3051 } 3052 3053 static int iscsit_send_r2t( 3054 struct iscsi_cmd *cmd, 3055 struct iscsi_conn *conn) 3056 { 3057 struct iscsi_r2t *r2t; 3058 struct iscsi_r2t_rsp *hdr; 3059 int ret; 3060 3061 r2t = iscsit_get_r2t_from_list(cmd); 3062 if (!r2t) 3063 return -1; 3064 3065 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3066 memset(hdr, 0, ISCSI_HDR_LEN); 3067 hdr->opcode = ISCSI_OP_R2T; 3068 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3069 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3070 (struct scsi_lun *)&hdr->lun); 3071 hdr->itt = cmd->init_task_tag; 3072 if (conn->conn_transport->iscsit_get_r2t_ttt) 3073 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3074 else 3075 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3076 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3077 hdr->statsn = cpu_to_be32(conn->stat_sn); 3078 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3079 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3080 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3081 hdr->data_offset = cpu_to_be32(r2t->offset); 3082 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3083 3084 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3085 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3086 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3087 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3088 r2t->offset, r2t->xfer_len, conn->cid); 3089 3090 spin_lock_bh(&cmd->r2t_lock); 3091 r2t->sent_r2t = 1; 3092 spin_unlock_bh(&cmd->r2t_lock); 3093 3094 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3095 if (ret < 0) { 3096 return ret; 3097 } 3098 3099 spin_lock_bh(&cmd->dataout_timeout_lock); 3100 iscsit_start_dataout_timer(cmd, conn); 3101 spin_unlock_bh(&cmd->dataout_timeout_lock); 3102 3103 return 0; 3104 } 3105 3106 /* 3107 * @recovery: If called from iscsi_task_reassign_complete_write() for 3108 * connection recovery. 3109 */ 3110 int iscsit_build_r2ts_for_cmd( 3111 struct iscsi_conn *conn, 3112 struct iscsi_cmd *cmd, 3113 bool recovery) 3114 { 3115 int first_r2t = 1; 3116 u32 offset = 0, xfer_len = 0; 3117 3118 spin_lock_bh(&cmd->r2t_lock); 3119 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3120 spin_unlock_bh(&cmd->r2t_lock); 3121 return 0; 3122 } 3123 3124 if (conn->sess->sess_ops->DataSequenceInOrder && 3125 !recovery) 3126 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3127 3128 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3129 if (conn->sess->sess_ops->DataSequenceInOrder) { 3130 offset = cmd->r2t_offset; 3131 3132 if (first_r2t && recovery) { 3133 int new_data_end = offset + 3134 conn->sess->sess_ops->MaxBurstLength - 3135 cmd->next_burst_len; 3136 3137 if (new_data_end > cmd->se_cmd.data_length) 3138 xfer_len = cmd->se_cmd.data_length - offset; 3139 else 3140 xfer_len = 3141 conn->sess->sess_ops->MaxBurstLength - 3142 cmd->next_burst_len; 3143 } else { 3144 int new_data_end = offset + 3145 conn->sess->sess_ops->MaxBurstLength; 3146 3147 if (new_data_end > cmd->se_cmd.data_length) 3148 xfer_len = cmd->se_cmd.data_length - offset; 3149 else 3150 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3151 } 3152 cmd->r2t_offset += xfer_len; 3153 3154 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3155 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3156 } else { 3157 struct iscsi_seq *seq; 3158 3159 seq = iscsit_get_seq_holder_for_r2t(cmd); 3160 if (!seq) { 3161 spin_unlock_bh(&cmd->r2t_lock); 3162 return -1; 3163 } 3164 3165 offset = seq->offset; 3166 xfer_len = seq->xfer_len; 3167 3168 if (cmd->seq_send_order == cmd->seq_count) 3169 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3170 } 3171 cmd->outstanding_r2ts++; 3172 first_r2t = 0; 3173 3174 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3175 spin_unlock_bh(&cmd->r2t_lock); 3176 return -1; 3177 } 3178 3179 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3180 break; 3181 } 3182 spin_unlock_bh(&cmd->r2t_lock); 3183 3184 return 0; 3185 } 3186 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3187 3188 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3189 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3190 { 3191 if (inc_stat_sn) 3192 cmd->stat_sn = conn->stat_sn++; 3193 3194 atomic_long_inc(&conn->sess->rsp_pdus); 3195 3196 memset(hdr, 0, ISCSI_HDR_LEN); 3197 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3198 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3199 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3200 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3201 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3202 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3203 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3204 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3205 } 3206 hdr->response = cmd->iscsi_response; 3207 hdr->cmd_status = cmd->se_cmd.scsi_status; 3208 hdr->itt = cmd->init_task_tag; 3209 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3210 3211 iscsit_increment_maxcmdsn(cmd, conn->sess); 3212 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3213 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3214 3215 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3216 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3217 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3218 cmd->se_cmd.scsi_status, conn->cid); 3219 } 3220 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3221 3222 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3223 { 3224 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3225 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3226 void *data_buf = NULL; 3227 u32 padding = 0, data_buf_len = 0; 3228 3229 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3230 3231 /* 3232 * Attach SENSE DATA payload to iSCSI Response PDU 3233 */ 3234 if (cmd->se_cmd.sense_buffer && 3235 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3236 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3237 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3238 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3239 3240 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3241 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3242 data_buf = cmd->sense_buffer; 3243 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3244 3245 if (padding) { 3246 memset(cmd->sense_buffer + 3247 cmd->se_cmd.scsi_sense_length, 0, padding); 3248 pr_debug("Adding %u bytes of padding to" 3249 " SENSE.\n", padding); 3250 } 3251 3252 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3253 " Response PDU\n", 3254 cmd->se_cmd.scsi_sense_length); 3255 } 3256 3257 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3258 data_buf_len); 3259 } 3260 3261 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3262 { 3263 switch (se_tmr->response) { 3264 case TMR_FUNCTION_COMPLETE: 3265 return ISCSI_TMF_RSP_COMPLETE; 3266 case TMR_TASK_DOES_NOT_EXIST: 3267 return ISCSI_TMF_RSP_NO_TASK; 3268 case TMR_LUN_DOES_NOT_EXIST: 3269 return ISCSI_TMF_RSP_NO_LUN; 3270 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3271 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3272 case TMR_FUNCTION_REJECTED: 3273 default: 3274 return ISCSI_TMF_RSP_REJECTED; 3275 } 3276 } 3277 3278 void 3279 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3280 struct iscsi_tm_rsp *hdr) 3281 { 3282 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3283 3284 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3285 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3286 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3287 hdr->itt = cmd->init_task_tag; 3288 cmd->stat_sn = conn->stat_sn++; 3289 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3290 3291 iscsit_increment_maxcmdsn(cmd, conn->sess); 3292 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3293 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3294 3295 pr_debug("Built Task Management Response ITT: 0x%08x," 3296 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3297 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3298 } 3299 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3300 3301 static int 3302 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3303 { 3304 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3305 3306 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3307 3308 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3309 } 3310 3311 static bool iscsit_check_inaddr_any(struct iscsi_np *np) 3312 { 3313 bool ret = false; 3314 3315 if (np->np_sockaddr.ss_family == AF_INET6) { 3316 const struct sockaddr_in6 sin6 = { 3317 .sin6_addr = IN6ADDR_ANY_INIT }; 3318 struct sockaddr_in6 *sock_in6 = 3319 (struct sockaddr_in6 *)&np->np_sockaddr; 3320 3321 if (!memcmp(sock_in6->sin6_addr.s6_addr, 3322 sin6.sin6_addr.s6_addr, 16)) 3323 ret = true; 3324 } else { 3325 struct sockaddr_in * sock_in = 3326 (struct sockaddr_in *)&np->np_sockaddr; 3327 3328 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY)) 3329 ret = true; 3330 } 3331 3332 return ret; 3333 } 3334 3335 #define SENDTARGETS_BUF_LIMIT 32768U 3336 3337 static int 3338 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3339 enum iscsit_transport_type network_transport, 3340 int skip_bytes, bool *completed) 3341 { 3342 char *payload = NULL; 3343 struct iscsi_conn *conn = cmd->conn; 3344 struct iscsi_portal_group *tpg; 3345 struct iscsi_tiqn *tiqn; 3346 struct iscsi_tpg_np *tpg_np; 3347 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3348 int target_name_printed; 3349 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3350 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3351 bool active; 3352 3353 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3354 SENDTARGETS_BUF_LIMIT); 3355 3356 payload = kzalloc(buffer_len, GFP_KERNEL); 3357 if (!payload) { 3358 pr_err("Unable to allocate memory for sendtargets" 3359 " response.\n"); 3360 return -ENOMEM; 3361 } 3362 /* 3363 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3364 * explicit case.. 3365 */ 3366 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3367 text_ptr = strchr(text_in, '='); 3368 if (!text_ptr) { 3369 pr_err("Unable to locate '=' string in text_in:" 3370 " %s\n", text_in); 3371 kfree(payload); 3372 return -EINVAL; 3373 } 3374 /* 3375 * Skip over '=' character.. 3376 */ 3377 text_ptr += 1; 3378 } 3379 3380 spin_lock(&tiqn_lock); 3381 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3382 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3383 strcmp(tiqn->tiqn, text_ptr)) { 3384 continue; 3385 } 3386 3387 target_name_printed = 0; 3388 3389 spin_lock(&tiqn->tiqn_tpg_lock); 3390 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3391 3392 /* If demo_mode_discovery=0 and generate_node_acls=0 3393 * (demo mode dislabed) do not return 3394 * TargetName+TargetAddress unless a NodeACL exists. 3395 */ 3396 3397 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3398 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3399 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3400 cmd->conn->sess->sess_ops->InitiatorName))) { 3401 continue; 3402 } 3403 3404 spin_lock(&tpg->tpg_state_lock); 3405 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3406 spin_unlock(&tpg->tpg_state_lock); 3407 3408 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3409 continue; 3410 3411 spin_lock(&tpg->tpg_np_lock); 3412 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3413 tpg_np_list) { 3414 struct iscsi_np *np = tpg_np->tpg_np; 3415 bool inaddr_any = iscsit_check_inaddr_any(np); 3416 struct sockaddr_storage *sockaddr; 3417 3418 if (np->np_network_transport != network_transport) 3419 continue; 3420 3421 if (!target_name_printed) { 3422 len = sprintf(buf, "TargetName=%s", 3423 tiqn->tiqn); 3424 len += 1; 3425 3426 if ((len + payload_len) > buffer_len) { 3427 spin_unlock(&tpg->tpg_np_lock); 3428 spin_unlock(&tiqn->tiqn_tpg_lock); 3429 end_of_buf = 1; 3430 goto eob; 3431 } 3432 3433 if (skip_bytes && len <= skip_bytes) { 3434 skip_bytes -= len; 3435 } else { 3436 memcpy(payload + payload_len, buf, len); 3437 payload_len += len; 3438 target_name_printed = 1; 3439 if (len > skip_bytes) 3440 skip_bytes = 0; 3441 } 3442 } 3443 3444 if (inaddr_any) 3445 sockaddr = &conn->local_sockaddr; 3446 else 3447 sockaddr = &np->np_sockaddr; 3448 3449 len = sprintf(buf, "TargetAddress=" 3450 "%pISpc,%hu", 3451 sockaddr, 3452 tpg->tpgt); 3453 len += 1; 3454 3455 if ((len + payload_len) > buffer_len) { 3456 spin_unlock(&tpg->tpg_np_lock); 3457 spin_unlock(&tiqn->tiqn_tpg_lock); 3458 end_of_buf = 1; 3459 goto eob; 3460 } 3461 3462 if (skip_bytes && len <= skip_bytes) { 3463 skip_bytes -= len; 3464 } else { 3465 memcpy(payload + payload_len, buf, len); 3466 payload_len += len; 3467 if (len > skip_bytes) 3468 skip_bytes = 0; 3469 } 3470 } 3471 spin_unlock(&tpg->tpg_np_lock); 3472 } 3473 spin_unlock(&tiqn->tiqn_tpg_lock); 3474 eob: 3475 if (end_of_buf) { 3476 *completed = false; 3477 break; 3478 } 3479 3480 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3481 break; 3482 } 3483 spin_unlock(&tiqn_lock); 3484 3485 cmd->buf_ptr = payload; 3486 3487 return payload_len; 3488 } 3489 3490 int 3491 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3492 struct iscsi_text_rsp *hdr, 3493 enum iscsit_transport_type network_transport) 3494 { 3495 int text_length, padding; 3496 bool completed = true; 3497 3498 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3499 cmd->read_data_done, 3500 &completed); 3501 if (text_length < 0) 3502 return text_length; 3503 3504 if (completed) { 3505 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3506 } else { 3507 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; 3508 cmd->read_data_done += text_length; 3509 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3510 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3511 } 3512 hdr->opcode = ISCSI_OP_TEXT_RSP; 3513 padding = ((-text_length) & 3); 3514 hton24(hdr->dlength, text_length); 3515 hdr->itt = cmd->init_task_tag; 3516 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3517 cmd->stat_sn = conn->stat_sn++; 3518 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3519 3520 iscsit_increment_maxcmdsn(cmd, conn->sess); 3521 /* 3522 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3523 * correctly increment MaxCmdSN for each response answering a 3524 * non immediate text request with a valid CmdSN. 3525 */ 3526 cmd->maxcmdsn_inc = 0; 3527 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3528 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3529 3530 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3531 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3532 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3533 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3534 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3535 3536 return text_length + padding; 3537 } 3538 EXPORT_SYMBOL(iscsit_build_text_rsp); 3539 3540 static int iscsit_send_text_rsp( 3541 struct iscsi_cmd *cmd, 3542 struct iscsi_conn *conn) 3543 { 3544 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3545 int text_length; 3546 3547 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3548 conn->conn_transport->transport_type); 3549 if (text_length < 0) 3550 return text_length; 3551 3552 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3553 cmd->buf_ptr, 3554 text_length); 3555 } 3556 3557 void 3558 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3559 struct iscsi_reject *hdr) 3560 { 3561 hdr->opcode = ISCSI_OP_REJECT; 3562 hdr->reason = cmd->reject_reason; 3563 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3564 hton24(hdr->dlength, ISCSI_HDR_LEN); 3565 hdr->ffffffff = cpu_to_be32(0xffffffff); 3566 cmd->stat_sn = conn->stat_sn++; 3567 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3568 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3569 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3570 3571 } 3572 EXPORT_SYMBOL(iscsit_build_reject); 3573 3574 static int iscsit_send_reject( 3575 struct iscsi_cmd *cmd, 3576 struct iscsi_conn *conn) 3577 { 3578 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3579 3580 iscsit_build_reject(cmd, conn, hdr); 3581 3582 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3583 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3584 3585 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3586 cmd->buf_ptr, 3587 ISCSI_HDR_LEN); 3588 } 3589 3590 void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3591 { 3592 int ord, cpu; 3593 /* 3594 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3595 * within iscsit_start_kthreads() 3596 * 3597 * Here we use bitmap_id to determine which CPU that this 3598 * iSCSI connection's RX/TX threads will be scheduled to 3599 * execute upon. 3600 */ 3601 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3602 for_each_online_cpu(cpu) { 3603 if (ord-- == 0) { 3604 cpumask_set_cpu(cpu, conn->conn_cpumask); 3605 return; 3606 } 3607 } 3608 /* 3609 * This should never be reached.. 3610 */ 3611 dump_stack(); 3612 cpumask_setall(conn->conn_cpumask); 3613 } 3614 3615 int 3616 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3617 { 3618 int ret; 3619 3620 switch (state) { 3621 case ISTATE_SEND_R2T: 3622 ret = iscsit_send_r2t(cmd, conn); 3623 if (ret < 0) 3624 goto err; 3625 break; 3626 case ISTATE_REMOVE: 3627 spin_lock_bh(&conn->cmd_lock); 3628 list_del_init(&cmd->i_conn_node); 3629 spin_unlock_bh(&conn->cmd_lock); 3630 3631 iscsit_free_cmd(cmd, false); 3632 break; 3633 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3634 iscsit_mod_nopin_response_timer(conn); 3635 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3636 if (ret < 0) 3637 goto err; 3638 break; 3639 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3640 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3641 if (ret < 0) 3642 goto err; 3643 break; 3644 default: 3645 pr_err("Unknown Opcode: 0x%02x ITT:" 3646 " 0x%08x, i_state: %d on CID: %hu\n", 3647 cmd->iscsi_opcode, cmd->init_task_tag, state, 3648 conn->cid); 3649 goto err; 3650 } 3651 3652 return 0; 3653 3654 err: 3655 return -1; 3656 } 3657 EXPORT_SYMBOL(iscsit_immediate_queue); 3658 3659 static int 3660 iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3661 { 3662 struct iscsit_transport *t = conn->conn_transport; 3663 struct iscsi_queue_req *qr; 3664 struct iscsi_cmd *cmd; 3665 u8 state; 3666 int ret; 3667 3668 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3669 atomic_set(&conn->check_immediate_queue, 0); 3670 cmd = qr->cmd; 3671 state = qr->state; 3672 kmem_cache_free(lio_qr_cache, qr); 3673 3674 ret = t->iscsit_immediate_queue(conn, cmd, state); 3675 if (ret < 0) 3676 return ret; 3677 } 3678 3679 return 0; 3680 } 3681 3682 int 3683 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3684 { 3685 int ret; 3686 3687 check_rsp_state: 3688 switch (state) { 3689 case ISTATE_SEND_DATAIN: 3690 ret = iscsit_send_datain(cmd, conn); 3691 if (ret < 0) 3692 goto err; 3693 else if (!ret) 3694 /* more drs */ 3695 goto check_rsp_state; 3696 else if (ret == 1) { 3697 /* all done */ 3698 spin_lock_bh(&cmd->istate_lock); 3699 cmd->i_state = ISTATE_SENT_STATUS; 3700 spin_unlock_bh(&cmd->istate_lock); 3701 3702 if (atomic_read(&conn->check_immediate_queue)) 3703 return 1; 3704 3705 return 0; 3706 } else if (ret == 2) { 3707 /* Still must send status, 3708 SCF_TRANSPORT_TASK_SENSE was set */ 3709 spin_lock_bh(&cmd->istate_lock); 3710 cmd->i_state = ISTATE_SEND_STATUS; 3711 spin_unlock_bh(&cmd->istate_lock); 3712 state = ISTATE_SEND_STATUS; 3713 goto check_rsp_state; 3714 } 3715 3716 break; 3717 case ISTATE_SEND_STATUS: 3718 case ISTATE_SEND_STATUS_RECOVERY: 3719 ret = iscsit_send_response(cmd, conn); 3720 break; 3721 case ISTATE_SEND_LOGOUTRSP: 3722 ret = iscsit_send_logout(cmd, conn); 3723 break; 3724 case ISTATE_SEND_ASYNCMSG: 3725 ret = iscsit_send_conn_drop_async_message( 3726 cmd, conn); 3727 break; 3728 case ISTATE_SEND_NOPIN: 3729 ret = iscsit_send_nopin(cmd, conn); 3730 break; 3731 case ISTATE_SEND_REJECT: 3732 ret = iscsit_send_reject(cmd, conn); 3733 break; 3734 case ISTATE_SEND_TASKMGTRSP: 3735 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3736 if (ret != 0) 3737 break; 3738 ret = iscsit_tmr_post_handler(cmd, conn); 3739 if (ret != 0) 3740 iscsit_fall_back_to_erl0(conn->sess); 3741 break; 3742 case ISTATE_SEND_TEXTRSP: 3743 ret = iscsit_send_text_rsp(cmd, conn); 3744 break; 3745 default: 3746 pr_err("Unknown Opcode: 0x%02x ITT:" 3747 " 0x%08x, i_state: %d on CID: %hu\n", 3748 cmd->iscsi_opcode, cmd->init_task_tag, 3749 state, conn->cid); 3750 goto err; 3751 } 3752 if (ret < 0) 3753 goto err; 3754 3755 switch (state) { 3756 case ISTATE_SEND_LOGOUTRSP: 3757 if (!iscsit_logout_post_handler(cmd, conn)) 3758 return -ECONNRESET; 3759 /* fall through */ 3760 case ISTATE_SEND_STATUS: 3761 case ISTATE_SEND_ASYNCMSG: 3762 case ISTATE_SEND_NOPIN: 3763 case ISTATE_SEND_STATUS_RECOVERY: 3764 case ISTATE_SEND_TEXTRSP: 3765 case ISTATE_SEND_TASKMGTRSP: 3766 case ISTATE_SEND_REJECT: 3767 spin_lock_bh(&cmd->istate_lock); 3768 cmd->i_state = ISTATE_SENT_STATUS; 3769 spin_unlock_bh(&cmd->istate_lock); 3770 break; 3771 default: 3772 pr_err("Unknown Opcode: 0x%02x ITT:" 3773 " 0x%08x, i_state: %d on CID: %hu\n", 3774 cmd->iscsi_opcode, cmd->init_task_tag, 3775 cmd->i_state, conn->cid); 3776 goto err; 3777 } 3778 3779 if (atomic_read(&conn->check_immediate_queue)) 3780 return 1; 3781 3782 return 0; 3783 3784 err: 3785 return -1; 3786 } 3787 EXPORT_SYMBOL(iscsit_response_queue); 3788 3789 static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3790 { 3791 struct iscsit_transport *t = conn->conn_transport; 3792 struct iscsi_queue_req *qr; 3793 struct iscsi_cmd *cmd; 3794 u8 state; 3795 int ret; 3796 3797 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3798 cmd = qr->cmd; 3799 state = qr->state; 3800 kmem_cache_free(lio_qr_cache, qr); 3801 3802 ret = t->iscsit_response_queue(conn, cmd, state); 3803 if (ret == 1 || ret < 0) 3804 return ret; 3805 } 3806 3807 return 0; 3808 } 3809 3810 int iscsi_target_tx_thread(void *arg) 3811 { 3812 int ret = 0; 3813 struct iscsi_conn *conn = arg; 3814 /* 3815 * Allow ourselves to be interrupted by SIGINT so that a 3816 * connection recovery / failure event can be triggered externally. 3817 */ 3818 allow_signal(SIGINT); 3819 3820 while (!kthread_should_stop()) { 3821 /* 3822 * Ensure that both TX and RX per connection kthreads 3823 * are scheduled to run on the same CPU. 3824 */ 3825 iscsit_thread_check_cpumask(conn, current, 1); 3826 3827 wait_event_interruptible(conn->queues_wq, 3828 !iscsit_conn_all_queues_empty(conn)); 3829 3830 if (signal_pending(current)) 3831 goto transport_err; 3832 3833 get_immediate: 3834 ret = iscsit_handle_immediate_queue(conn); 3835 if (ret < 0) 3836 goto transport_err; 3837 3838 ret = iscsit_handle_response_queue(conn); 3839 if (ret == 1) 3840 goto get_immediate; 3841 else if (ret == -ECONNRESET) 3842 goto out; 3843 else if (ret < 0) 3844 goto transport_err; 3845 } 3846 3847 transport_err: 3848 /* 3849 * Avoid the normal connection failure code-path if this connection 3850 * is still within LOGIN mode, and iscsi_np process context is 3851 * responsible for cleaning up the early connection failure. 3852 */ 3853 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3854 iscsit_take_action_for_connection_exit(conn); 3855 out: 3856 return 0; 3857 } 3858 3859 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3860 { 3861 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3862 struct iscsi_cmd *cmd; 3863 int ret = 0; 3864 3865 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3866 case ISCSI_OP_SCSI_CMD: 3867 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3868 if (!cmd) 3869 goto reject; 3870 3871 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3872 break; 3873 case ISCSI_OP_SCSI_DATA_OUT: 3874 ret = iscsit_handle_data_out(conn, buf); 3875 break; 3876 case ISCSI_OP_NOOP_OUT: 3877 cmd = NULL; 3878 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3879 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3880 if (!cmd) 3881 goto reject; 3882 } 3883 ret = iscsit_handle_nop_out(conn, cmd, buf); 3884 break; 3885 case ISCSI_OP_SCSI_TMFUNC: 3886 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3887 if (!cmd) 3888 goto reject; 3889 3890 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3891 break; 3892 case ISCSI_OP_TEXT: 3893 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3894 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3895 if (!cmd) 3896 goto reject; 3897 } else { 3898 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3899 if (!cmd) 3900 goto reject; 3901 } 3902 3903 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3904 break; 3905 case ISCSI_OP_LOGOUT: 3906 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3907 if (!cmd) 3908 goto reject; 3909 3910 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3911 if (ret > 0) 3912 wait_for_completion_timeout(&conn->conn_logout_comp, 3913 SECONDS_FOR_LOGOUT_COMP * HZ); 3914 break; 3915 case ISCSI_OP_SNACK: 3916 ret = iscsit_handle_snack(conn, buf); 3917 break; 3918 default: 3919 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3920 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3921 pr_err("Cannot recover from unknown" 3922 " opcode while ERL=0, closing iSCSI connection.\n"); 3923 return -1; 3924 } 3925 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3926 " closing iSCSI connection.\n"); 3927 ret = -1; 3928 break; 3929 } 3930 3931 return ret; 3932 reject: 3933 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3934 } 3935 3936 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3937 { 3938 bool ret; 3939 3940 spin_lock_bh(&conn->state_lock); 3941 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3942 spin_unlock_bh(&conn->state_lock); 3943 3944 return ret; 3945 } 3946 3947 static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3948 { 3949 int ret; 3950 u8 buffer[ISCSI_HDR_LEN], opcode; 3951 u32 checksum = 0, digest = 0; 3952 struct kvec iov; 3953 3954 while (!kthread_should_stop()) { 3955 /* 3956 * Ensure that both TX and RX per connection kthreads 3957 * are scheduled to run on the same CPU. 3958 */ 3959 iscsit_thread_check_cpumask(conn, current, 0); 3960 3961 memset(buffer, 0, ISCSI_HDR_LEN); 3962 memset(&iov, 0, sizeof(struct kvec)); 3963 3964 iov.iov_base = buffer; 3965 iov.iov_len = ISCSI_HDR_LEN; 3966 3967 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3968 if (ret != ISCSI_HDR_LEN) { 3969 iscsit_rx_thread_wait_for_tcp(conn); 3970 return; 3971 } 3972 3973 if (conn->conn_ops->HeaderDigest) { 3974 iov.iov_base = &digest; 3975 iov.iov_len = ISCSI_CRC_LEN; 3976 3977 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3978 if (ret != ISCSI_CRC_LEN) { 3979 iscsit_rx_thread_wait_for_tcp(conn); 3980 return; 3981 } 3982 3983 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 3984 buffer, ISCSI_HDR_LEN, 3985 0, NULL, (u8 *)&checksum); 3986 3987 if (digest != checksum) { 3988 pr_err("HeaderDigest CRC32C failed," 3989 " received 0x%08x, computed 0x%08x\n", 3990 digest, checksum); 3991 /* 3992 * Set the PDU to 0xff so it will intentionally 3993 * hit default in the switch below. 3994 */ 3995 memset(buffer, 0xff, ISCSI_HDR_LEN); 3996 atomic_long_inc(&conn->sess->conn_digest_errors); 3997 } else { 3998 pr_debug("Got HeaderDigest CRC32C" 3999 " 0x%08x\n", checksum); 4000 } 4001 } 4002 4003 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4004 return; 4005 4006 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4007 4008 if (conn->sess->sess_ops->SessionType && 4009 ((!(opcode & ISCSI_OP_TEXT)) || 4010 (!(opcode & ISCSI_OP_LOGOUT)))) { 4011 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4012 " while in Discovery Session, rejecting.\n", opcode); 4013 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4014 buffer); 4015 return; 4016 } 4017 4018 ret = iscsi_target_rx_opcode(conn, buffer); 4019 if (ret < 0) 4020 return; 4021 } 4022 } 4023 4024 int iscsi_target_rx_thread(void *arg) 4025 { 4026 int rc; 4027 struct iscsi_conn *conn = arg; 4028 4029 /* 4030 * Allow ourselves to be interrupted by SIGINT so that a 4031 * connection recovery / failure event can be triggered externally. 4032 */ 4033 allow_signal(SIGINT); 4034 /* 4035 * Wait for iscsi_post_login_handler() to complete before allowing 4036 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4037 */ 4038 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4039 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4040 return 0; 4041 4042 if (!conn->conn_transport->iscsit_get_rx_pdu) 4043 return 0; 4044 4045 conn->conn_transport->iscsit_get_rx_pdu(conn); 4046 4047 if (!signal_pending(current)) 4048 atomic_set(&conn->transport_failed, 1); 4049 iscsit_take_action_for_connection_exit(conn); 4050 return 0; 4051 } 4052 4053 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4054 { 4055 LIST_HEAD(tmp_list); 4056 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4057 struct iscsi_session *sess = conn->sess; 4058 /* 4059 * We expect this function to only ever be called from either RX or TX 4060 * thread context via iscsit_close_connection() once the other context 4061 * has been reset -> returned sleeping pre-handler state. 4062 */ 4063 spin_lock_bh(&conn->cmd_lock); 4064 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4065 4066 list_for_each_entry(cmd, &tmp_list, i_conn_node) { 4067 struct se_cmd *se_cmd = &cmd->se_cmd; 4068 4069 if (se_cmd->se_tfo != NULL) { 4070 spin_lock(&se_cmd->t_state_lock); 4071 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4072 spin_unlock(&se_cmd->t_state_lock); 4073 } 4074 } 4075 spin_unlock_bh(&conn->cmd_lock); 4076 4077 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4078 list_del_init(&cmd->i_conn_node); 4079 4080 iscsit_increment_maxcmdsn(cmd, sess); 4081 iscsit_free_cmd(cmd, true); 4082 4083 } 4084 } 4085 4086 static void iscsit_stop_timers_for_cmds( 4087 struct iscsi_conn *conn) 4088 { 4089 struct iscsi_cmd *cmd; 4090 4091 spin_lock_bh(&conn->cmd_lock); 4092 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4093 if (cmd->data_direction == DMA_TO_DEVICE) 4094 iscsit_stop_dataout_timer(cmd); 4095 } 4096 spin_unlock_bh(&conn->cmd_lock); 4097 } 4098 4099 int iscsit_close_connection( 4100 struct iscsi_conn *conn) 4101 { 4102 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4103 struct iscsi_session *sess = conn->sess; 4104 4105 pr_debug("Closing iSCSI connection CID %hu on SID:" 4106 " %u\n", conn->cid, sess->sid); 4107 /* 4108 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4109 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4110 * sleeping and the logout response never got sent because the 4111 * connection failed. 4112 * 4113 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4114 * to signal logout response TX interrupt completion. Go ahead and skip 4115 * this for iser since isert_rx_opcode() does not wait on logout failure, 4116 * and to avoid iscsi_conn pointer dereference in iser-target code. 4117 */ 4118 if (!conn->conn_transport->rdma_shutdown) 4119 complete(&conn->conn_logout_comp); 4120 4121 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4122 if (conn->tx_thread && 4123 cmpxchg(&conn->tx_thread_active, true, false)) { 4124 send_sig(SIGINT, conn->tx_thread, 1); 4125 kthread_stop(conn->tx_thread); 4126 } 4127 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4128 if (conn->rx_thread && 4129 cmpxchg(&conn->rx_thread_active, true, false)) { 4130 send_sig(SIGINT, conn->rx_thread, 1); 4131 kthread_stop(conn->rx_thread); 4132 } 4133 } 4134 4135 spin_lock(&iscsit_global->ts_bitmap_lock); 4136 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4137 get_order(1)); 4138 spin_unlock(&iscsit_global->ts_bitmap_lock); 4139 4140 iscsit_stop_timers_for_cmds(conn); 4141 iscsit_stop_nopin_response_timer(conn); 4142 iscsit_stop_nopin_timer(conn); 4143 4144 if (conn->conn_transport->iscsit_wait_conn) 4145 conn->conn_transport->iscsit_wait_conn(conn); 4146 4147 /* 4148 * During Connection recovery drop unacknowledged out of order 4149 * commands for this connection, and prepare the other commands 4150 * for reallegiance. 4151 * 4152 * During normal operation clear the out of order commands (but 4153 * do not free the struct iscsi_ooo_cmdsn's) and release all 4154 * struct iscsi_cmds. 4155 */ 4156 if (atomic_read(&conn->connection_recovery)) { 4157 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4158 iscsit_prepare_cmds_for_reallegiance(conn); 4159 } else { 4160 iscsit_clear_ooo_cmdsns_for_conn(conn); 4161 iscsit_release_commands_from_conn(conn); 4162 } 4163 iscsit_free_queue_reqs_for_conn(conn); 4164 4165 /* 4166 * Handle decrementing session or connection usage count if 4167 * a logout response was not able to be sent because the 4168 * connection failed. Fall back to Session Recovery here. 4169 */ 4170 if (atomic_read(&conn->conn_logout_remove)) { 4171 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4172 iscsit_dec_conn_usage_count(conn); 4173 iscsit_dec_session_usage_count(sess); 4174 } 4175 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4176 iscsit_dec_conn_usage_count(conn); 4177 4178 atomic_set(&conn->conn_logout_remove, 0); 4179 atomic_set(&sess->session_reinstatement, 0); 4180 atomic_set(&sess->session_fall_back_to_erl0, 1); 4181 } 4182 4183 spin_lock_bh(&sess->conn_lock); 4184 list_del(&conn->conn_list); 4185 4186 /* 4187 * Attempt to let the Initiator know this connection failed by 4188 * sending an Connection Dropped Async Message on another 4189 * active connection. 4190 */ 4191 if (atomic_read(&conn->connection_recovery)) 4192 iscsit_build_conn_drop_async_message(conn); 4193 4194 spin_unlock_bh(&sess->conn_lock); 4195 4196 /* 4197 * If connection reinstatement is being performed on this connection, 4198 * up the connection reinstatement semaphore that is being blocked on 4199 * in iscsit_cause_connection_reinstatement(). 4200 */ 4201 spin_lock_bh(&conn->state_lock); 4202 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4203 spin_unlock_bh(&conn->state_lock); 4204 complete(&conn->conn_wait_comp); 4205 wait_for_completion(&conn->conn_post_wait_comp); 4206 spin_lock_bh(&conn->state_lock); 4207 } 4208 4209 /* 4210 * If connection reinstatement is being performed on this connection 4211 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4212 * connection wait rcfr semaphore that is being blocked on 4213 * an iscsit_connection_reinstatement_rcfr(). 4214 */ 4215 if (atomic_read(&conn->connection_wait_rcfr)) { 4216 spin_unlock_bh(&conn->state_lock); 4217 complete(&conn->conn_wait_rcfr_comp); 4218 wait_for_completion(&conn->conn_post_wait_comp); 4219 spin_lock_bh(&conn->state_lock); 4220 } 4221 atomic_set(&conn->connection_reinstatement, 1); 4222 spin_unlock_bh(&conn->state_lock); 4223 4224 /* 4225 * If any other processes are accessing this connection pointer we 4226 * must wait until they have completed. 4227 */ 4228 iscsit_check_conn_usage_count(conn); 4229 4230 ahash_request_free(conn->conn_tx_hash); 4231 if (conn->conn_rx_hash) { 4232 struct crypto_ahash *tfm; 4233 4234 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4235 ahash_request_free(conn->conn_rx_hash); 4236 crypto_free_ahash(tfm); 4237 } 4238 4239 free_cpumask_var(conn->conn_cpumask); 4240 4241 kfree(conn->conn_ops); 4242 conn->conn_ops = NULL; 4243 4244 if (conn->sock) 4245 sock_release(conn->sock); 4246 4247 if (conn->conn_transport->iscsit_free_conn) 4248 conn->conn_transport->iscsit_free_conn(conn); 4249 4250 iscsit_put_transport(conn->conn_transport); 4251 4252 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4253 conn->conn_state = TARG_CONN_STATE_FREE; 4254 kfree(conn); 4255 4256 spin_lock_bh(&sess->conn_lock); 4257 atomic_dec(&sess->nconn); 4258 pr_debug("Decremented iSCSI connection count to %hu from node:" 4259 " %s\n", atomic_read(&sess->nconn), 4260 sess->sess_ops->InitiatorName); 4261 /* 4262 * Make sure that if one connection fails in an non ERL=2 iSCSI 4263 * Session that they all fail. 4264 */ 4265 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4266 !atomic_read(&sess->session_logout)) 4267 atomic_set(&sess->session_fall_back_to_erl0, 1); 4268 4269 /* 4270 * If this was not the last connection in the session, and we are 4271 * performing session reinstatement or falling back to ERL=0, call 4272 * iscsit_stop_session() without sleeping to shutdown the other 4273 * active connections. 4274 */ 4275 if (atomic_read(&sess->nconn)) { 4276 if (!atomic_read(&sess->session_reinstatement) && 4277 !atomic_read(&sess->session_fall_back_to_erl0)) { 4278 spin_unlock_bh(&sess->conn_lock); 4279 return 0; 4280 } 4281 if (!atomic_read(&sess->session_stop_active)) { 4282 atomic_set(&sess->session_stop_active, 1); 4283 spin_unlock_bh(&sess->conn_lock); 4284 iscsit_stop_session(sess, 0, 0); 4285 return 0; 4286 } 4287 spin_unlock_bh(&sess->conn_lock); 4288 return 0; 4289 } 4290 4291 /* 4292 * If this was the last connection in the session and one of the 4293 * following is occurring: 4294 * 4295 * Session Reinstatement is not being performed, and are falling back 4296 * to ERL=0 call iscsit_close_session(). 4297 * 4298 * Session Logout was requested. iscsit_close_session() will be called 4299 * elsewhere. 4300 * 4301 * Session Continuation is not being performed, start the Time2Retain 4302 * handler and check if sleep_on_sess_wait_sem is active. 4303 */ 4304 if (!atomic_read(&sess->session_reinstatement) && 4305 atomic_read(&sess->session_fall_back_to_erl0)) { 4306 spin_unlock_bh(&sess->conn_lock); 4307 iscsit_close_session(sess); 4308 4309 return 0; 4310 } else if (atomic_read(&sess->session_logout)) { 4311 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4312 sess->session_state = TARG_SESS_STATE_FREE; 4313 spin_unlock_bh(&sess->conn_lock); 4314 4315 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4316 complete(&sess->session_wait_comp); 4317 4318 return 0; 4319 } else { 4320 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4321 sess->session_state = TARG_SESS_STATE_FAILED; 4322 4323 if (!atomic_read(&sess->session_continuation)) { 4324 spin_unlock_bh(&sess->conn_lock); 4325 iscsit_start_time2retain_handler(sess); 4326 } else 4327 spin_unlock_bh(&sess->conn_lock); 4328 4329 if (atomic_read(&sess->sleep_on_sess_wait_comp)) 4330 complete(&sess->session_wait_comp); 4331 4332 return 0; 4333 } 4334 } 4335 4336 /* 4337 * If the iSCSI Session for the iSCSI Initiator Node exists, 4338 * forcefully shutdown the iSCSI NEXUS. 4339 */ 4340 int iscsit_close_session(struct iscsi_session *sess) 4341 { 4342 struct iscsi_portal_group *tpg = sess->tpg; 4343 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4344 4345 if (atomic_read(&sess->nconn)) { 4346 pr_err("%d connection(s) still exist for iSCSI session" 4347 " to %s\n", atomic_read(&sess->nconn), 4348 sess->sess_ops->InitiatorName); 4349 BUG(); 4350 } 4351 4352 spin_lock_bh(&se_tpg->session_lock); 4353 atomic_set(&sess->session_logout, 1); 4354 atomic_set(&sess->session_reinstatement, 1); 4355 iscsit_stop_time2retain_timer(sess); 4356 spin_unlock_bh(&se_tpg->session_lock); 4357 4358 /* 4359 * transport_deregister_session_configfs() will clear the 4360 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4361 * can be setting it again with __transport_register_session() in 4362 * iscsi_post_login_handler() again after the iscsit_stop_session() 4363 * completes in iscsi_np context. 4364 */ 4365 transport_deregister_session_configfs(sess->se_sess); 4366 4367 /* 4368 * If any other processes are accessing this session pointer we must 4369 * wait until they have completed. If we are in an interrupt (the 4370 * time2retain handler) and contain and active session usage count we 4371 * restart the timer and exit. 4372 */ 4373 if (!in_interrupt()) { 4374 if (iscsit_check_session_usage_count(sess) == 1) 4375 iscsit_stop_session(sess, 1, 1); 4376 } else { 4377 if (iscsit_check_session_usage_count(sess) == 2) { 4378 atomic_set(&sess->session_logout, 0); 4379 iscsit_start_time2retain_handler(sess); 4380 return 0; 4381 } 4382 } 4383 4384 transport_deregister_session(sess->se_sess); 4385 4386 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4387 iscsit_free_connection_recovery_entires(sess); 4388 4389 iscsit_free_all_ooo_cmdsns(sess); 4390 4391 spin_lock_bh(&se_tpg->session_lock); 4392 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4393 sess->session_state = TARG_SESS_STATE_FREE; 4394 pr_debug("Released iSCSI session from node: %s\n", 4395 sess->sess_ops->InitiatorName); 4396 tpg->nsessions--; 4397 if (tpg->tpg_tiqn) 4398 tpg->tpg_tiqn->tiqn_nsessions--; 4399 4400 pr_debug("Decremented number of active iSCSI Sessions on" 4401 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4402 4403 spin_lock(&sess_idr_lock); 4404 idr_remove(&sess_idr, sess->session_index); 4405 spin_unlock(&sess_idr_lock); 4406 4407 kfree(sess->sess_ops); 4408 sess->sess_ops = NULL; 4409 spin_unlock_bh(&se_tpg->session_lock); 4410 4411 kfree(sess); 4412 return 0; 4413 } 4414 4415 static void iscsit_logout_post_handler_closesession( 4416 struct iscsi_conn *conn) 4417 { 4418 struct iscsi_session *sess = conn->sess; 4419 int sleep = 1; 4420 /* 4421 * Traditional iscsi/tcp will invoke this logic from TX thread 4422 * context during session logout, so clear tx_thread_active and 4423 * sleep if iscsit_close_connection() has not already occured. 4424 * 4425 * Since iser-target invokes this logic from it's own workqueue, 4426 * always sleep waiting for RX/TX thread shutdown to complete 4427 * within iscsit_close_connection(). 4428 */ 4429 if (!conn->conn_transport->rdma_shutdown) 4430 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4431 4432 atomic_set(&conn->conn_logout_remove, 0); 4433 complete(&conn->conn_logout_comp); 4434 4435 iscsit_dec_conn_usage_count(conn); 4436 iscsit_stop_session(sess, sleep, sleep); 4437 iscsit_dec_session_usage_count(sess); 4438 iscsit_close_session(sess); 4439 } 4440 4441 static void iscsit_logout_post_handler_samecid( 4442 struct iscsi_conn *conn) 4443 { 4444 int sleep = 1; 4445 4446 if (!conn->conn_transport->rdma_shutdown) 4447 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4448 4449 atomic_set(&conn->conn_logout_remove, 0); 4450 complete(&conn->conn_logout_comp); 4451 4452 iscsit_cause_connection_reinstatement(conn, sleep); 4453 iscsit_dec_conn_usage_count(conn); 4454 } 4455 4456 static void iscsit_logout_post_handler_diffcid( 4457 struct iscsi_conn *conn, 4458 u16 cid) 4459 { 4460 struct iscsi_conn *l_conn; 4461 struct iscsi_session *sess = conn->sess; 4462 bool conn_found = false; 4463 4464 if (!sess) 4465 return; 4466 4467 spin_lock_bh(&sess->conn_lock); 4468 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4469 if (l_conn->cid == cid) { 4470 iscsit_inc_conn_usage_count(l_conn); 4471 conn_found = true; 4472 break; 4473 } 4474 } 4475 spin_unlock_bh(&sess->conn_lock); 4476 4477 if (!conn_found) 4478 return; 4479 4480 if (l_conn->sock) 4481 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4482 4483 spin_lock_bh(&l_conn->state_lock); 4484 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4485 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4486 spin_unlock_bh(&l_conn->state_lock); 4487 4488 iscsit_cause_connection_reinstatement(l_conn, 1); 4489 iscsit_dec_conn_usage_count(l_conn); 4490 } 4491 4492 /* 4493 * Return of 0 causes the TX thread to restart. 4494 */ 4495 int iscsit_logout_post_handler( 4496 struct iscsi_cmd *cmd, 4497 struct iscsi_conn *conn) 4498 { 4499 int ret = 0; 4500 4501 switch (cmd->logout_reason) { 4502 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4503 switch (cmd->logout_response) { 4504 case ISCSI_LOGOUT_SUCCESS: 4505 case ISCSI_LOGOUT_CLEANUP_FAILED: 4506 default: 4507 iscsit_logout_post_handler_closesession(conn); 4508 break; 4509 } 4510 ret = 0; 4511 break; 4512 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4513 if (conn->cid == cmd->logout_cid) { 4514 switch (cmd->logout_response) { 4515 case ISCSI_LOGOUT_SUCCESS: 4516 case ISCSI_LOGOUT_CLEANUP_FAILED: 4517 default: 4518 iscsit_logout_post_handler_samecid(conn); 4519 break; 4520 } 4521 ret = 0; 4522 } else { 4523 switch (cmd->logout_response) { 4524 case ISCSI_LOGOUT_SUCCESS: 4525 iscsit_logout_post_handler_diffcid(conn, 4526 cmd->logout_cid); 4527 break; 4528 case ISCSI_LOGOUT_CID_NOT_FOUND: 4529 case ISCSI_LOGOUT_CLEANUP_FAILED: 4530 default: 4531 break; 4532 } 4533 ret = 1; 4534 } 4535 break; 4536 case ISCSI_LOGOUT_REASON_RECOVERY: 4537 switch (cmd->logout_response) { 4538 case ISCSI_LOGOUT_SUCCESS: 4539 case ISCSI_LOGOUT_CID_NOT_FOUND: 4540 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4541 case ISCSI_LOGOUT_CLEANUP_FAILED: 4542 default: 4543 break; 4544 } 4545 ret = 1; 4546 break; 4547 default: 4548 break; 4549 4550 } 4551 return ret; 4552 } 4553 EXPORT_SYMBOL(iscsit_logout_post_handler); 4554 4555 void iscsit_fail_session(struct iscsi_session *sess) 4556 { 4557 struct iscsi_conn *conn; 4558 4559 spin_lock_bh(&sess->conn_lock); 4560 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4561 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4562 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4563 } 4564 spin_unlock_bh(&sess->conn_lock); 4565 4566 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4567 sess->session_state = TARG_SESS_STATE_FAILED; 4568 } 4569 4570 int iscsit_free_session(struct iscsi_session *sess) 4571 { 4572 u16 conn_count = atomic_read(&sess->nconn); 4573 struct iscsi_conn *conn, *conn_tmp = NULL; 4574 int is_last; 4575 4576 spin_lock_bh(&sess->conn_lock); 4577 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4578 4579 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4580 conn_list) { 4581 if (conn_count == 0) 4582 break; 4583 4584 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4585 is_last = 1; 4586 } else { 4587 iscsit_inc_conn_usage_count(conn_tmp); 4588 is_last = 0; 4589 } 4590 iscsit_inc_conn_usage_count(conn); 4591 4592 spin_unlock_bh(&sess->conn_lock); 4593 iscsit_cause_connection_reinstatement(conn, 1); 4594 spin_lock_bh(&sess->conn_lock); 4595 4596 iscsit_dec_conn_usage_count(conn); 4597 if (is_last == 0) 4598 iscsit_dec_conn_usage_count(conn_tmp); 4599 4600 conn_count--; 4601 } 4602 4603 if (atomic_read(&sess->nconn)) { 4604 spin_unlock_bh(&sess->conn_lock); 4605 wait_for_completion(&sess->session_wait_comp); 4606 } else 4607 spin_unlock_bh(&sess->conn_lock); 4608 4609 iscsit_close_session(sess); 4610 return 0; 4611 } 4612 4613 void iscsit_stop_session( 4614 struct iscsi_session *sess, 4615 int session_sleep, 4616 int connection_sleep) 4617 { 4618 u16 conn_count = atomic_read(&sess->nconn); 4619 struct iscsi_conn *conn, *conn_tmp = NULL; 4620 int is_last; 4621 4622 spin_lock_bh(&sess->conn_lock); 4623 if (session_sleep) 4624 atomic_set(&sess->sleep_on_sess_wait_comp, 1); 4625 4626 if (connection_sleep) { 4627 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4628 conn_list) { 4629 if (conn_count == 0) 4630 break; 4631 4632 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4633 is_last = 1; 4634 } else { 4635 iscsit_inc_conn_usage_count(conn_tmp); 4636 is_last = 0; 4637 } 4638 iscsit_inc_conn_usage_count(conn); 4639 4640 spin_unlock_bh(&sess->conn_lock); 4641 iscsit_cause_connection_reinstatement(conn, 1); 4642 spin_lock_bh(&sess->conn_lock); 4643 4644 iscsit_dec_conn_usage_count(conn); 4645 if (is_last == 0) 4646 iscsit_dec_conn_usage_count(conn_tmp); 4647 conn_count--; 4648 } 4649 } else { 4650 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4651 iscsit_cause_connection_reinstatement(conn, 0); 4652 } 4653 4654 if (session_sleep && atomic_read(&sess->nconn)) { 4655 spin_unlock_bh(&sess->conn_lock); 4656 wait_for_completion(&sess->session_wait_comp); 4657 } else 4658 spin_unlock_bh(&sess->conn_lock); 4659 } 4660 4661 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4662 { 4663 struct iscsi_session *sess; 4664 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4665 struct se_session *se_sess, *se_sess_tmp; 4666 LIST_HEAD(free_list); 4667 int session_count = 0; 4668 4669 spin_lock_bh(&se_tpg->session_lock); 4670 if (tpg->nsessions && !force) { 4671 spin_unlock_bh(&se_tpg->session_lock); 4672 return -1; 4673 } 4674 4675 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4676 sess_list) { 4677 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4678 4679 spin_lock(&sess->conn_lock); 4680 if (atomic_read(&sess->session_fall_back_to_erl0) || 4681 atomic_read(&sess->session_logout) || 4682 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4683 spin_unlock(&sess->conn_lock); 4684 continue; 4685 } 4686 atomic_set(&sess->session_reinstatement, 1); 4687 spin_unlock(&sess->conn_lock); 4688 4689 list_move_tail(&se_sess->sess_list, &free_list); 4690 } 4691 spin_unlock_bh(&se_tpg->session_lock); 4692 4693 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4694 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4695 4696 iscsit_free_session(sess); 4697 session_count++; 4698 } 4699 4700 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4701 " Group: %hu\n", session_count, tpg->tpgt); 4702 return 0; 4703 } 4704 4705 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4706 MODULE_VERSION("4.1.x"); 4707 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4708 MODULE_LICENSE("GPL"); 4709 4710 module_init(iscsi_target_init_module); 4711 module_exit(iscsi_target_cleanup_module); 4712