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