1// SPDX-License-Identifier: GPL-2.0-or-later 2/******************************************************************************* 3 * This file contains main functions related to the iSCSI Target Core Driver. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 6 * 7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ******************************************************************************/ 10 11#include <crypto/hash.h> 12#include <linux/string.h> 13#include <linux/kthread.h> 14#include <linux/completion.h> 15#include <linux/module.h> 16#include <linux/vmalloc.h> 17#include <linux/idr.h> 18#include <linux/delay.h> 19#include <linux/sched/signal.h> 20#include <asm/unaligned.h> 21#include <linux/inet.h> 22#include <net/ipv6.h> 23#include <scsi/scsi_proto.h> 24#include <scsi/iscsi_proto.h> 25#include <scsi/scsi_tcq.h> 26#include <target/target_core_base.h> 27#include <target/target_core_fabric.h> 28 29#include <target/iscsi/iscsi_target_core.h> 30#include "iscsi_target_parameters.h" 31#include "iscsi_target_seq_pdu_list.h" 32#include "iscsi_target_datain_values.h" 33#include "iscsi_target_erl0.h" 34#include "iscsi_target_erl1.h" 35#include "iscsi_target_erl2.h" 36#include "iscsi_target_login.h" 37#include "iscsi_target_tmr.h" 38#include "iscsi_target_tpg.h" 39#include "iscsi_target_util.h" 40#include "iscsi_target.h" 41#include "iscsi_target_device.h" 42#include <target/iscsi/iscsi_target_stat.h> 43 44#include <target/iscsi/iscsi_transport.h> 45 46static LIST_HEAD(g_tiqn_list); 47static LIST_HEAD(g_np_list); 48static DEFINE_SPINLOCK(tiqn_lock); 49static DEFINE_MUTEX(np_lock); 50 51static struct idr tiqn_idr; 52DEFINE_IDA(sess_ida); 53struct mutex auth_id_lock; 54 55struct iscsit_global *iscsit_global; 56 57struct kmem_cache *lio_qr_cache; 58struct kmem_cache *lio_dr_cache; 59struct kmem_cache *lio_ooo_cache; 60struct kmem_cache *lio_r2t_cache; 61 62static int iscsit_handle_immediate_data(struct iscsi_cmd *, 63 struct iscsi_scsi_req *, u32); 64 65struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 66{ 67 struct iscsi_tiqn *tiqn = NULL; 68 69 spin_lock(&tiqn_lock); 70 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 71 if (!strcmp(tiqn->tiqn, buf)) { 72 73 spin_lock(&tiqn->tiqn_state_lock); 74 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 75 tiqn->tiqn_access_count++; 76 spin_unlock(&tiqn->tiqn_state_lock); 77 spin_unlock(&tiqn_lock); 78 return tiqn; 79 } 80 spin_unlock(&tiqn->tiqn_state_lock); 81 } 82 } 83 spin_unlock(&tiqn_lock); 84 85 return NULL; 86} 87 88static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 89{ 90 spin_lock(&tiqn->tiqn_state_lock); 91 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 92 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 93 spin_unlock(&tiqn->tiqn_state_lock); 94 return 0; 95 } 96 spin_unlock(&tiqn->tiqn_state_lock); 97 98 return -1; 99} 100 101void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 102{ 103 spin_lock(&tiqn->tiqn_state_lock); 104 tiqn->tiqn_access_count--; 105 spin_unlock(&tiqn->tiqn_state_lock); 106} 107 108/* 109 * Note that IQN formatting is expected to be done in userspace, and 110 * no explict IQN format checks are done here. 111 */ 112struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 113{ 114 struct iscsi_tiqn *tiqn = NULL; 115 int ret; 116 117 if (strlen(buf) >= ISCSI_IQN_LEN) { 118 pr_err("Target IQN exceeds %d bytes\n", 119 ISCSI_IQN_LEN); 120 return ERR_PTR(-EINVAL); 121 } 122 123 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); 124 if (!tiqn) 125 return ERR_PTR(-ENOMEM); 126 127 sprintf(tiqn->tiqn, "%s", buf); 128 INIT_LIST_HEAD(&tiqn->tiqn_list); 129 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 130 spin_lock_init(&tiqn->tiqn_state_lock); 131 spin_lock_init(&tiqn->tiqn_tpg_lock); 132 spin_lock_init(&tiqn->sess_err_stats.lock); 133 spin_lock_init(&tiqn->login_stats.lock); 134 spin_lock_init(&tiqn->logout_stats.lock); 135 136 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 137 138 idr_preload(GFP_KERNEL); 139 spin_lock(&tiqn_lock); 140 141 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 142 if (ret < 0) { 143 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 144 spin_unlock(&tiqn_lock); 145 idr_preload_end(); 146 kfree(tiqn); 147 return ERR_PTR(ret); 148 } 149 tiqn->tiqn_index = ret; 150 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 151 152 spin_unlock(&tiqn_lock); 153 idr_preload_end(); 154 155 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 156 157 return tiqn; 158 159} 160 161static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 162{ 163 /* 164 * Wait for accesses to said struct iscsi_tiqn to end. 165 */ 166 spin_lock(&tiqn->tiqn_state_lock); 167 while (tiqn->tiqn_access_count != 0) { 168 spin_unlock(&tiqn->tiqn_state_lock); 169 msleep(10); 170 spin_lock(&tiqn->tiqn_state_lock); 171 } 172 spin_unlock(&tiqn->tiqn_state_lock); 173} 174 175void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 176{ 177 /* 178 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 179 * while holding tiqn->tiqn_state_lock. This means that all subsequent 180 * attempts to access this struct iscsi_tiqn will fail from both transport 181 * fabric and control code paths. 182 */ 183 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 184 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 185 return; 186 } 187 188 iscsit_wait_for_tiqn(tiqn); 189 190 spin_lock(&tiqn_lock); 191 list_del(&tiqn->tiqn_list); 192 idr_remove(&tiqn_idr, tiqn->tiqn_index); 193 spin_unlock(&tiqn_lock); 194 195 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 196 tiqn->tiqn); 197 kfree(tiqn); 198} 199 200int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 201{ 202 int ret; 203 /* 204 * Determine if the network portal is accepting storage traffic. 205 */ 206 spin_lock_bh(&np->np_thread_lock); 207 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 208 spin_unlock_bh(&np->np_thread_lock); 209 return -1; 210 } 211 spin_unlock_bh(&np->np_thread_lock); 212 /* 213 * Determine if the portal group is accepting storage traffic. 214 */ 215 spin_lock_bh(&tpg->tpg_state_lock); 216 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 217 spin_unlock_bh(&tpg->tpg_state_lock); 218 return -1; 219 } 220 spin_unlock_bh(&tpg->tpg_state_lock); 221 222 /* 223 * Here we serialize access across the TIQN+TPG Tuple. 224 */ 225 ret = down_interruptible(&tpg->np_login_sem); 226 if (ret != 0) 227 return -1; 228 229 spin_lock_bh(&tpg->tpg_state_lock); 230 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 231 spin_unlock_bh(&tpg->tpg_state_lock); 232 up(&tpg->np_login_sem); 233 return -1; 234 } 235 spin_unlock_bh(&tpg->tpg_state_lock); 236 237 return 0; 238} 239 240void iscsit_login_kref_put(struct kref *kref) 241{ 242 struct iscsi_tpg_np *tpg_np = container_of(kref, 243 struct iscsi_tpg_np, tpg_np_kref); 244 245 complete(&tpg_np->tpg_np_comp); 246} 247 248int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 249 struct iscsi_tpg_np *tpg_np) 250{ 251 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 252 253 up(&tpg->np_login_sem); 254 255 if (tpg_np) 256 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 257 258 if (tiqn) 259 iscsit_put_tiqn_for_login(tiqn); 260 261 return 0; 262} 263 264bool iscsit_check_np_match( 265 struct sockaddr_storage *sockaddr, 266 struct iscsi_np *np, 267 int network_transport) 268{ 269 struct sockaddr_in *sock_in, *sock_in_e; 270 struct sockaddr_in6 *sock_in6, *sock_in6_e; 271 bool ip_match = false; 272 u16 port, port_e; 273 274 if (sockaddr->ss_family == AF_INET6) { 275 sock_in6 = (struct sockaddr_in6 *)sockaddr; 276 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 277 278 if (!memcmp(&sock_in6->sin6_addr.in6_u, 279 &sock_in6_e->sin6_addr.in6_u, 280 sizeof(struct in6_addr))) 281 ip_match = true; 282 283 port = ntohs(sock_in6->sin6_port); 284 port_e = ntohs(sock_in6_e->sin6_port); 285 } else { 286 sock_in = (struct sockaddr_in *)sockaddr; 287 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 288 289 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 290 ip_match = true; 291 292 port = ntohs(sock_in->sin_port); 293 port_e = ntohs(sock_in_e->sin_port); 294 } 295 296 if (ip_match && (port_e == port) && 297 (np->np_network_transport == network_transport)) 298 return true; 299 300 return false; 301} 302 303static struct iscsi_np *iscsit_get_np( 304 struct sockaddr_storage *sockaddr, 305 int network_transport) 306{ 307 struct iscsi_np *np; 308 bool match; 309 310 lockdep_assert_held(&np_lock); 311 312 list_for_each_entry(np, &g_np_list, np_list) { 313 spin_lock_bh(&np->np_thread_lock); 314 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 315 spin_unlock_bh(&np->np_thread_lock); 316 continue; 317 } 318 319 match = iscsit_check_np_match(sockaddr, np, network_transport); 320 if (match) { 321 /* 322 * Increment the np_exports reference count now to 323 * prevent iscsit_del_np() below from being called 324 * while iscsi_tpg_add_network_portal() is called. 325 */ 326 np->np_exports++; 327 spin_unlock_bh(&np->np_thread_lock); 328 return np; 329 } 330 spin_unlock_bh(&np->np_thread_lock); 331 } 332 333 return NULL; 334} 335 336struct iscsi_np *iscsit_add_np( 337 struct sockaddr_storage *sockaddr, 338 int network_transport) 339{ 340 struct iscsi_np *np; 341 int ret; 342 343 mutex_lock(&np_lock); 344 345 /* 346 * Locate the existing struct iscsi_np if already active.. 347 */ 348 np = iscsit_get_np(sockaddr, network_transport); 349 if (np) { 350 mutex_unlock(&np_lock); 351 return np; 352 } 353 354 np = kzalloc(sizeof(*np), GFP_KERNEL); 355 if (!np) { 356 mutex_unlock(&np_lock); 357 return ERR_PTR(-ENOMEM); 358 } 359 360 np->np_flags |= NPF_IP_NETWORK; 361 np->np_network_transport = network_transport; 362 spin_lock_init(&np->np_thread_lock); 363 init_completion(&np->np_restart_comp); 364 INIT_LIST_HEAD(&np->np_list); 365 366 timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0); 367 368 ret = iscsi_target_setup_login_socket(np, sockaddr); 369 if (ret != 0) { 370 kfree(np); 371 mutex_unlock(&np_lock); 372 return ERR_PTR(ret); 373 } 374 375 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 376 if (IS_ERR(np->np_thread)) { 377 pr_err("Unable to create kthread: iscsi_np\n"); 378 ret = PTR_ERR(np->np_thread); 379 kfree(np); 380 mutex_unlock(&np_lock); 381 return ERR_PTR(ret); 382 } 383 /* 384 * Increment the np_exports reference count now to prevent 385 * iscsit_del_np() below from being run while a new call to 386 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 387 * active. We don't need to hold np->np_thread_lock at this 388 * point because iscsi_np has not been added to g_np_list yet. 389 */ 390 np->np_exports = 1; 391 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 392 393 list_add_tail(&np->np_list, &g_np_list); 394 mutex_unlock(&np_lock); 395 396 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 397 &np->np_sockaddr, np->np_transport->name); 398 399 return np; 400} 401 402int iscsit_reset_np_thread( 403 struct iscsi_np *np, 404 struct iscsi_tpg_np *tpg_np, 405 struct iscsi_portal_group *tpg, 406 bool shutdown) 407{ 408 spin_lock_bh(&np->np_thread_lock); 409 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 410 spin_unlock_bh(&np->np_thread_lock); 411 return 0; 412 } 413 np->np_thread_state = ISCSI_NP_THREAD_RESET; 414 atomic_inc(&np->np_reset_count); 415 416 if (np->np_thread) { 417 spin_unlock_bh(&np->np_thread_lock); 418 send_sig(SIGINT, np->np_thread, 1); 419 wait_for_completion(&np->np_restart_comp); 420 spin_lock_bh(&np->np_thread_lock); 421 } 422 spin_unlock_bh(&np->np_thread_lock); 423 424 if (tpg_np && shutdown) { 425 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 426 427 wait_for_completion(&tpg_np->tpg_np_comp); 428 } 429 430 return 0; 431} 432 433static void iscsit_free_np(struct iscsi_np *np) 434{ 435 if (np->np_socket) 436 sock_release(np->np_socket); 437} 438 439int iscsit_del_np(struct iscsi_np *np) 440{ 441 spin_lock_bh(&np->np_thread_lock); 442 np->np_exports--; 443 if (np->np_exports) { 444 np->enabled = true; 445 spin_unlock_bh(&np->np_thread_lock); 446 return 0; 447 } 448 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 449 spin_unlock_bh(&np->np_thread_lock); 450 451 if (np->np_thread) { 452 /* 453 * We need to send the signal to wakeup Linux/Net 454 * which may be sleeping in sock_accept().. 455 */ 456 send_sig(SIGINT, np->np_thread, 1); 457 kthread_stop(np->np_thread); 458 np->np_thread = NULL; 459 } 460 461 np->np_transport->iscsit_free_np(np); 462 463 mutex_lock(&np_lock); 464 list_del(&np->np_list); 465 mutex_unlock(&np_lock); 466 467 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 468 &np->np_sockaddr, np->np_transport->name); 469 470 iscsit_put_transport(np->np_transport); 471 kfree(np); 472 return 0; 473} 474 475static void iscsit_get_rx_pdu(struct iscsi_conn *); 476 477int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 478{ 479 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 480} 481EXPORT_SYMBOL(iscsit_queue_rsp); 482 483void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd) 484{ 485 spin_lock_bh(&conn->cmd_lock); 486 if (!list_empty(&cmd->i_conn_node)) 487 list_del_init(&cmd->i_conn_node); 488 spin_unlock_bh(&conn->cmd_lock); 489 490 __iscsit_free_cmd(cmd, true); 491} 492EXPORT_SYMBOL(iscsit_aborted_task); 493 494static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 495 u32, u32, const void *, void *); 496static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *); 497 498static int 499iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 500 const void *data_buf, u32 data_buf_len) 501{ 502 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 503 struct kvec *iov; 504 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 505 int ret; 506 507 iov = &cmd->iov_misc[0]; 508 iov[niov].iov_base = cmd->pdu; 509 iov[niov++].iov_len = ISCSI_HDR_LEN; 510 511 if (conn->conn_ops->HeaderDigest) { 512 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 513 514 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 515 ISCSI_HDR_LEN, 0, NULL, 516 header_digest); 517 518 iov[0].iov_len += ISCSI_CRC_LEN; 519 tx_size += ISCSI_CRC_LEN; 520 pr_debug("Attaching CRC32C HeaderDigest" 521 " to opcode 0x%x 0x%08x\n", 522 hdr->opcode, *header_digest); 523 } 524 525 if (data_buf_len) { 526 u32 padding = ((-data_buf_len) & 3); 527 528 iov[niov].iov_base = (void *)data_buf; 529 iov[niov++].iov_len = data_buf_len; 530 tx_size += data_buf_len; 531 532 if (padding != 0) { 533 iov[niov].iov_base = &cmd->pad_bytes; 534 iov[niov++].iov_len = padding; 535 tx_size += padding; 536 pr_debug("Attaching %u additional" 537 " padding bytes.\n", padding); 538 } 539 540 if (conn->conn_ops->DataDigest) { 541 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 542 data_buf, data_buf_len, 543 padding, &cmd->pad_bytes, 544 &cmd->data_crc); 545 546 iov[niov].iov_base = &cmd->data_crc; 547 iov[niov++].iov_len = ISCSI_CRC_LEN; 548 tx_size += ISCSI_CRC_LEN; 549 pr_debug("Attached DataDigest for %u" 550 " bytes opcode 0x%x, CRC 0x%08x\n", 551 data_buf_len, hdr->opcode, cmd->data_crc); 552 } 553 } 554 555 cmd->iov_misc_count = niov; 556 cmd->tx_size = tx_size; 557 558 ret = iscsit_send_tx_data(cmd, conn, 1); 559 if (ret < 0) { 560 iscsit_tx_thread_wait_for_tcp(conn); 561 return ret; 562 } 563 564 return 0; 565} 566 567static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec, 568 u32 data_offset, u32 data_length); 569static void iscsit_unmap_iovec(struct iscsi_cmd *); 570static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *, 571 u32, u32, u32, u8 *); 572static int 573iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 574 const struct iscsi_datain *datain) 575{ 576 struct kvec *iov; 577 u32 iov_count = 0, tx_size = 0; 578 int ret, iov_ret; 579 580 iov = &cmd->iov_data[0]; 581 iov[iov_count].iov_base = cmd->pdu; 582 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 583 tx_size += ISCSI_HDR_LEN; 584 585 if (conn->conn_ops->HeaderDigest) { 586 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 587 588 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 589 ISCSI_HDR_LEN, 0, NULL, 590 header_digest); 591 592 iov[0].iov_len += ISCSI_CRC_LEN; 593 tx_size += ISCSI_CRC_LEN; 594 595 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 596 *header_digest); 597 } 598 599 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count], 600 cmd->orig_iov_data_count - (iov_count + 2), 601 datain->offset, datain->length); 602 if (iov_ret < 0) 603 return -1; 604 605 iov_count += iov_ret; 606 tx_size += datain->length; 607 608 cmd->padding = ((-datain->length) & 3); 609 if (cmd->padding) { 610 iov[iov_count].iov_base = cmd->pad_bytes; 611 iov[iov_count++].iov_len = cmd->padding; 612 tx_size += cmd->padding; 613 614 pr_debug("Attaching %u padding bytes\n", cmd->padding); 615 } 616 617 if (conn->conn_ops->DataDigest) { 618 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 619 cmd, datain->offset, 620 datain->length, 621 cmd->padding, 622 cmd->pad_bytes); 623 624 iov[iov_count].iov_base = &cmd->data_crc; 625 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 626 tx_size += ISCSI_CRC_LEN; 627 628 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 629 datain->length + cmd->padding, cmd->data_crc); 630 } 631 632 cmd->iov_data_count = iov_count; 633 cmd->tx_size = tx_size; 634 635 ret = iscsit_fe_sendpage_sg(cmd, conn); 636 637 iscsit_unmap_iovec(cmd); 638 639 if (ret < 0) { 640 iscsit_tx_thread_wait_for_tcp(conn); 641 return ret; 642 } 643 644 return 0; 645} 646 647static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 648 struct iscsi_datain_req *dr, const void *buf, 649 u32 buf_len) 650{ 651 if (dr) 652 return iscsit_xmit_datain_pdu(conn, cmd, buf); 653 else 654 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 655} 656 657static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn) 658{ 659 return TARGET_PROT_NORMAL; 660} 661 662static struct iscsit_transport iscsi_target_transport = { 663 .name = "iSCSI/TCP", 664 .transport_type = ISCSI_TCP, 665 .rdma_shutdown = false, 666 .owner = NULL, 667 .iscsit_setup_np = iscsit_setup_np, 668 .iscsit_accept_np = iscsit_accept_np, 669 .iscsit_free_np = iscsit_free_np, 670 .iscsit_get_login_rx = iscsit_get_login_rx, 671 .iscsit_put_login_tx = iscsit_put_login_tx, 672 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 673 .iscsit_immediate_queue = iscsit_immediate_queue, 674 .iscsit_response_queue = iscsit_response_queue, 675 .iscsit_queue_data_in = iscsit_queue_rsp, 676 .iscsit_queue_status = iscsit_queue_rsp, 677 .iscsit_aborted_task = iscsit_aborted_task, 678 .iscsit_xmit_pdu = iscsit_xmit_pdu, 679 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 680 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 681}; 682 683static int __init iscsi_target_init_module(void) 684{ 685 int ret = 0, size; 686 687 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 688 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 689 if (!iscsit_global) 690 return -1; 691 692 spin_lock_init(&iscsit_global->ts_bitmap_lock); 693 mutex_init(&auth_id_lock); 694 idr_init(&tiqn_idr); 695 696 ret = target_register_template(&iscsi_ops); 697 if (ret) 698 goto out; 699 700 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 701 iscsit_global->ts_bitmap = vzalloc(size); 702 if (!iscsit_global->ts_bitmap) 703 goto configfs_out; 704 705 lio_qr_cache = kmem_cache_create("lio_qr_cache", 706 sizeof(struct iscsi_queue_req), 707 __alignof__(struct iscsi_queue_req), 0, NULL); 708 if (!lio_qr_cache) { 709 pr_err("Unable to kmem_cache_create() for" 710 " lio_qr_cache\n"); 711 goto bitmap_out; 712 } 713 714 lio_dr_cache = kmem_cache_create("lio_dr_cache", 715 sizeof(struct iscsi_datain_req), 716 __alignof__(struct iscsi_datain_req), 0, NULL); 717 if (!lio_dr_cache) { 718 pr_err("Unable to kmem_cache_create() for" 719 " lio_dr_cache\n"); 720 goto qr_out; 721 } 722 723 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 724 sizeof(struct iscsi_ooo_cmdsn), 725 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 726 if (!lio_ooo_cache) { 727 pr_err("Unable to kmem_cache_create() for" 728 " lio_ooo_cache\n"); 729 goto dr_out; 730 } 731 732 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 733 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 734 0, NULL); 735 if (!lio_r2t_cache) { 736 pr_err("Unable to kmem_cache_create() for" 737 " lio_r2t_cache\n"); 738 goto ooo_out; 739 } 740 741 iscsit_register_transport(&iscsi_target_transport); 742 743 if (iscsit_load_discovery_tpg() < 0) 744 goto r2t_out; 745 746 return ret; 747r2t_out: 748 iscsit_unregister_transport(&iscsi_target_transport); 749 kmem_cache_destroy(lio_r2t_cache); 750ooo_out: 751 kmem_cache_destroy(lio_ooo_cache); 752dr_out: 753 kmem_cache_destroy(lio_dr_cache); 754qr_out: 755 kmem_cache_destroy(lio_qr_cache); 756bitmap_out: 757 vfree(iscsit_global->ts_bitmap); 758configfs_out: 759 /* XXX: this probably wants it to be it's own unwind step.. */ 760 if (iscsit_global->discovery_tpg) 761 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 762 target_unregister_template(&iscsi_ops); 763out: 764 kfree(iscsit_global); 765 return -ENOMEM; 766} 767 768static void __exit iscsi_target_cleanup_module(void) 769{ 770 iscsit_release_discovery_tpg(); 771 iscsit_unregister_transport(&iscsi_target_transport); 772 kmem_cache_destroy(lio_qr_cache); 773 kmem_cache_destroy(lio_dr_cache); 774 kmem_cache_destroy(lio_ooo_cache); 775 kmem_cache_destroy(lio_r2t_cache); 776 777 /* 778 * Shutdown discovery sessions and disable discovery TPG 779 */ 780 if (iscsit_global->discovery_tpg) 781 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 782 783 target_unregister_template(&iscsi_ops); 784 785 vfree(iscsit_global->ts_bitmap); 786 kfree(iscsit_global); 787} 788 789int iscsit_add_reject( 790 struct iscsi_conn *conn, 791 u8 reason, 792 unsigned char *buf) 793{ 794 struct iscsi_cmd *cmd; 795 796 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 797 if (!cmd) 798 return -1; 799 800 cmd->iscsi_opcode = ISCSI_OP_REJECT; 801 cmd->reject_reason = reason; 802 803 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 804 if (!cmd->buf_ptr) { 805 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 806 iscsit_free_cmd(cmd, false); 807 return -1; 808 } 809 810 spin_lock_bh(&conn->cmd_lock); 811 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 812 spin_unlock_bh(&conn->cmd_lock); 813 814 cmd->i_state = ISTATE_SEND_REJECT; 815 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 816 817 return -1; 818} 819EXPORT_SYMBOL(iscsit_add_reject); 820 821static int iscsit_add_reject_from_cmd( 822 struct iscsi_cmd *cmd, 823 u8 reason, 824 bool add_to_conn, 825 unsigned char *buf) 826{ 827 struct iscsi_conn *conn; 828 const bool do_put = cmd->se_cmd.se_tfo != NULL; 829 830 if (!cmd->conn) { 831 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 832 cmd->init_task_tag); 833 return -1; 834 } 835 conn = cmd->conn; 836 837 cmd->iscsi_opcode = ISCSI_OP_REJECT; 838 cmd->reject_reason = reason; 839 840 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 841 if (!cmd->buf_ptr) { 842 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 843 iscsit_free_cmd(cmd, false); 844 return -1; 845 } 846 847 if (add_to_conn) { 848 spin_lock_bh(&conn->cmd_lock); 849 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 850 spin_unlock_bh(&conn->cmd_lock); 851 } 852 853 cmd->i_state = ISTATE_SEND_REJECT; 854 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 855 /* 856 * Perform the kref_put now if se_cmd has already been setup by 857 * scsit_setup_scsi_cmd() 858 */ 859 if (do_put) { 860 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 861 target_put_sess_cmd(&cmd->se_cmd); 862 } 863 return -1; 864} 865 866static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason, 867 unsigned char *buf) 868{ 869 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 870} 871 872int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf) 873{ 874 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 875} 876EXPORT_SYMBOL(iscsit_reject_cmd); 877 878/* 879 * Map some portion of the allocated scatterlist to an iovec, suitable for 880 * kernel sockets to copy data in/out. 881 */ 882static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec, 883 u32 data_offset, u32 data_length) 884{ 885 u32 i = 0, orig_data_length = data_length; 886 struct scatterlist *sg; 887 unsigned int page_off; 888 889 /* 890 * We know each entry in t_data_sg contains a page. 891 */ 892 u32 ent = data_offset / PAGE_SIZE; 893 894 if (!data_length) 895 return 0; 896 897 if (ent >= cmd->se_cmd.t_data_nents) { 898 pr_err("Initial page entry out-of-bounds\n"); 899 goto overflow; 900 } 901 902 sg = &cmd->se_cmd.t_data_sg[ent]; 903 page_off = (data_offset % PAGE_SIZE); 904 905 cmd->first_data_sg = sg; 906 cmd->first_data_sg_off = page_off; 907 908 while (data_length) { 909 u32 cur_len; 910 911 if (WARN_ON_ONCE(!sg || i >= nvec)) 912 goto overflow; 913 914 cur_len = min_t(u32, data_length, sg->length - page_off); 915 916 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 917 iov[i].iov_len = cur_len; 918 919 data_length -= cur_len; 920 page_off = 0; 921 sg = sg_next(sg); 922 i++; 923 } 924 925 cmd->kmapped_nents = i; 926 927 return i; 928 929overflow: 930 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n", 931 data_offset, orig_data_length, i, nvec); 932 for_each_sg(cmd->se_cmd.t_data_sg, sg, 933 cmd->se_cmd.t_data_nents, i) { 934 pr_err("[%d] off %d len %d\n", 935 i, sg->offset, sg->length); 936 } 937 return -1; 938} 939 940static void iscsit_unmap_iovec(struct iscsi_cmd *cmd) 941{ 942 u32 i; 943 struct scatterlist *sg; 944 945 sg = cmd->first_data_sg; 946 947 for (i = 0; i < cmd->kmapped_nents; i++) 948 kunmap(sg_page(&sg[i])); 949} 950 951static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn) 952{ 953 LIST_HEAD(ack_list); 954 struct iscsi_cmd *cmd, *cmd_p; 955 956 conn->exp_statsn = exp_statsn; 957 958 if (conn->sess->sess_ops->RDMAExtensions) 959 return; 960 961 spin_lock_bh(&conn->cmd_lock); 962 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 963 spin_lock(&cmd->istate_lock); 964 if ((cmd->i_state == ISTATE_SENT_STATUS) && 965 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 966 cmd->i_state = ISTATE_REMOVE; 967 spin_unlock(&cmd->istate_lock); 968 list_move_tail(&cmd->i_conn_node, &ack_list); 969 continue; 970 } 971 spin_unlock(&cmd->istate_lock); 972 } 973 spin_unlock_bh(&conn->cmd_lock); 974 975 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 976 list_del_init(&cmd->i_conn_node); 977 iscsit_free_cmd(cmd, false); 978 } 979} 980 981static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd) 982{ 983 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 984 985 iov_count += ISCSI_IOV_DATA_BUFFER; 986 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 987 if (!cmd->iov_data) 988 return -ENOMEM; 989 990 cmd->orig_iov_data_count = iov_count; 991 return 0; 992} 993 994int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 995 unsigned char *buf) 996{ 997 int data_direction, payload_length; 998 struct iscsi_scsi_req *hdr; 999 int iscsi_task_attr; 1000 int sam_task_attr; 1001 1002 atomic_long_inc(&conn->sess->cmd_pdus); 1003 1004 hdr = (struct iscsi_scsi_req *) buf; 1005 payload_length = ntoh24(hdr->dlength); 1006 1007 /* FIXME; Add checks for AdditionalHeaderSegment */ 1008 1009 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1010 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1011 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1012 " not set. Bad iSCSI Initiator.\n"); 1013 return iscsit_add_reject_cmd(cmd, 1014 ISCSI_REASON_BOOKMARK_INVALID, buf); 1015 } 1016 1017 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1018 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1019 /* 1020 * From RFC-3720 Section 10.3.1: 1021 * 1022 * "Either or both of R and W MAY be 1 when either the 1023 * Expected Data Transfer Length and/or Bidirectional Read 1024 * Expected Data Transfer Length are 0" 1025 * 1026 * For this case, go ahead and clear the unnecssary bits 1027 * to avoid any confusion with ->data_direction. 1028 */ 1029 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1030 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1031 1032 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1033 " set when Expected Data Transfer Length is 0 for" 1034 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1035 } 1036 1037 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1038 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1039 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1040 " MUST be set if Expected Data Transfer Length is not 0." 1041 " Bad iSCSI Initiator\n"); 1042 return iscsit_add_reject_cmd(cmd, 1043 ISCSI_REASON_BOOKMARK_INVALID, buf); 1044 } 1045 1046 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1047 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1048 pr_err("Bidirectional operations not supported!\n"); 1049 return iscsit_add_reject_cmd(cmd, 1050 ISCSI_REASON_BOOKMARK_INVALID, buf); 1051 } 1052 1053 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1054 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1055 " Scsi Command PDU.\n"); 1056 return iscsit_add_reject_cmd(cmd, 1057 ISCSI_REASON_BOOKMARK_INVALID, buf); 1058 } 1059 1060 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1061 pr_err("ImmediateData=No but DataSegmentLength=%u," 1062 " protocol error.\n", payload_length); 1063 return iscsit_add_reject_cmd(cmd, 1064 ISCSI_REASON_PROTOCOL_ERROR, buf); 1065 } 1066 1067 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1068 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1069 pr_err("Expected Data Transfer Length and Length of" 1070 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1071 " bit is not set protocol error\n"); 1072 return iscsit_add_reject_cmd(cmd, 1073 ISCSI_REASON_PROTOCOL_ERROR, buf); 1074 } 1075 1076 if (payload_length > be32_to_cpu(hdr->data_length)) { 1077 pr_err("DataSegmentLength: %u is greater than" 1078 " EDTL: %u, protocol error.\n", payload_length, 1079 hdr->data_length); 1080 return iscsit_add_reject_cmd(cmd, 1081 ISCSI_REASON_PROTOCOL_ERROR, buf); 1082 } 1083 1084 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1085 pr_err("DataSegmentLength: %u is greater than" 1086 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1087 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1088 return iscsit_add_reject_cmd(cmd, 1089 ISCSI_REASON_PROTOCOL_ERROR, buf); 1090 } 1091 1092 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1093 pr_err("DataSegmentLength: %u is greater than" 1094 " FirstBurstLength: %u, protocol error.\n", 1095 payload_length, conn->sess->sess_ops->FirstBurstLength); 1096 return iscsit_add_reject_cmd(cmd, 1097 ISCSI_REASON_BOOKMARK_INVALID, buf); 1098 } 1099 1100 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1101 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1102 DMA_NONE; 1103 1104 cmd->data_direction = data_direction; 1105 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1106 /* 1107 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1108 */ 1109 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1110 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1111 sam_task_attr = TCM_SIMPLE_TAG; 1112 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1113 sam_task_attr = TCM_ORDERED_TAG; 1114 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1115 sam_task_attr = TCM_HEAD_TAG; 1116 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1117 sam_task_attr = TCM_ACA_TAG; 1118 else { 1119 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1120 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1121 sam_task_attr = TCM_SIMPLE_TAG; 1122 } 1123 1124 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1125 cmd->i_state = ISTATE_NEW_CMD; 1126 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1127 cmd->immediate_data = (payload_length) ? 1 : 0; 1128 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1129 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1130 if (cmd->unsolicited_data) 1131 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1132 1133 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1134 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1135 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1136 else 1137 cmd->targ_xfer_tag = 0xFFFFFFFF; 1138 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1139 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1140 cmd->first_burst_len = payload_length; 1141 1142 if (!conn->sess->sess_ops->RDMAExtensions && 1143 cmd->data_direction == DMA_FROM_DEVICE) { 1144 struct iscsi_datain_req *dr; 1145 1146 dr = iscsit_allocate_datain_req(); 1147 if (!dr) 1148 return iscsit_add_reject_cmd(cmd, 1149 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1150 1151 iscsit_attach_datain_req(cmd, dr); 1152 } 1153 1154 /* 1155 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1156 */ 1157 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops, 1158 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1159 cmd->data_direction, sam_task_attr, 1160 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun)); 1161 1162 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1163 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1164 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1165 conn->cid); 1166 1167 target_get_sess_cmd(&cmd->se_cmd, true); 1168 1169 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1170 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb); 1171 if (cmd->sense_reason) { 1172 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1173 return iscsit_add_reject_cmd(cmd, 1174 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1175 } 1176 1177 goto attach_cmd; 1178 } 1179 1180 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd); 1181 if (cmd->sense_reason) 1182 goto attach_cmd; 1183 1184 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd); 1185 if (cmd->sense_reason) 1186 goto attach_cmd; 1187 1188 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1189 return iscsit_add_reject_cmd(cmd, 1190 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1191 } 1192 1193attach_cmd: 1194 spin_lock_bh(&conn->cmd_lock); 1195 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1196 spin_unlock_bh(&conn->cmd_lock); 1197 /* 1198 * Check if we need to delay processing because of ALUA 1199 * Active/NonOptimized primary access state.. 1200 */ 1201 core_alua_check_nonop_delay(&cmd->se_cmd); 1202 1203 return 0; 1204} 1205EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1206 1207void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd) 1208{ 1209 iscsit_set_dataout_sequence_values(cmd); 1210 1211 spin_lock_bh(&cmd->dataout_timeout_lock); 1212 iscsit_start_dataout_timer(cmd, cmd->conn); 1213 spin_unlock_bh(&cmd->dataout_timeout_lock); 1214} 1215EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); 1216 1217int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1218 struct iscsi_scsi_req *hdr) 1219{ 1220 int cmdsn_ret = 0; 1221 /* 1222 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1223 * the Immediate Bit is not set, and no Immediate 1224 * Data is attached. 1225 * 1226 * A PDU/CmdSN carrying Immediate Data can only 1227 * be processed after the DataCRC has passed. 1228 * If the DataCRC fails, the CmdSN MUST NOT 1229 * be acknowledged. (See below) 1230 */ 1231 if (!cmd->immediate_data) { 1232 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1233 (unsigned char *)hdr, hdr->cmdsn); 1234 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1235 return -1; 1236 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1237 target_put_sess_cmd(&cmd->se_cmd); 1238 return 0; 1239 } 1240 } 1241 1242 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1243 1244 /* 1245 * If no Immediate Data is attached, it's OK to return now. 1246 */ 1247 if (!cmd->immediate_data) { 1248 if (!cmd->sense_reason && cmd->unsolicited_data) 1249 iscsit_set_unsolicited_dataout(cmd); 1250 if (!cmd->sense_reason) 1251 return 0; 1252 1253 target_put_sess_cmd(&cmd->se_cmd); 1254 return 0; 1255 } 1256 1257 /* 1258 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1259 * execution. These exceptions are processed in CmdSN order using 1260 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1261 */ 1262 if (cmd->sense_reason) 1263 return 1; 1264 /* 1265 * Call directly into transport_generic_new_cmd() to perform 1266 * the backend memory allocation. 1267 */ 1268 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1269 if (cmd->sense_reason) 1270 return 1; 1271 1272 return 0; 1273} 1274EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1275 1276static int 1277iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr, 1278 bool dump_payload) 1279{ 1280 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1281 int rc; 1282 1283 /* 1284 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1285 */ 1286 if (dump_payload) { 1287 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, 1288 cmd->first_burst_len); 1289 1290 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", 1291 cmd->se_cmd.data_length, cmd->write_data_done, 1292 cmd->first_burst_len, length); 1293 rc = iscsit_dump_data_payload(cmd->conn, length, 1); 1294 pr_debug("Finished dumping immediate data\n"); 1295 if (rc < 0) 1296 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; 1297 } else { 1298 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1299 cmd->first_burst_len); 1300 } 1301 1302 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1303 /* 1304 * A PDU/CmdSN carrying Immediate Data passed 1305 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1306 * Immediate Bit is not set. 1307 */ 1308 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1309 (unsigned char *)hdr, hdr->cmdsn); 1310 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1311 return -1; 1312 1313 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1314 target_put_sess_cmd(&cmd->se_cmd); 1315 1316 return 0; 1317 } else if (cmd->unsolicited_data) 1318 iscsit_set_unsolicited_dataout(cmd); 1319 1320 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1321 /* 1322 * Immediate Data failed DataCRC and ERL>=1, 1323 * silently drop this PDU and let the initiator 1324 * plug the CmdSN gap. 1325 * 1326 * FIXME: Send Unsolicited NOPIN with reserved 1327 * TTT here to help the initiator figure out 1328 * the missing CmdSN, although they should be 1329 * intelligent enough to determine the missing 1330 * CmdSN and issue a retry to plug the sequence. 1331 */ 1332 cmd->i_state = ISTATE_REMOVE; 1333 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1334 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1335 return -1; 1336 1337 return 0; 1338} 1339 1340static int 1341iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1342 unsigned char *buf) 1343{ 1344 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1345 int rc, immed_data; 1346 bool dump_payload = false; 1347 1348 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1349 if (rc < 0) 1350 return 0; 1351 /* 1352 * Allocation iovecs needed for struct socket operations for 1353 * traditional iSCSI block I/O. 1354 */ 1355 if (iscsit_allocate_iovecs(cmd) < 0) { 1356 return iscsit_reject_cmd(cmd, 1357 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1358 } 1359 immed_data = cmd->immediate_data; 1360 1361 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1362 if (rc < 0) 1363 return rc; 1364 else if (rc > 0) 1365 dump_payload = true; 1366 1367 if (!immed_data) 1368 return 0; 1369 1370 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1371} 1372 1373static u32 iscsit_do_crypto_hash_sg( 1374 struct ahash_request *hash, 1375 struct iscsi_cmd *cmd, 1376 u32 data_offset, 1377 u32 data_length, 1378 u32 padding, 1379 u8 *pad_bytes) 1380{ 1381 u32 data_crc; 1382 struct scatterlist *sg; 1383 unsigned int page_off; 1384 1385 crypto_ahash_init(hash); 1386 1387 sg = cmd->first_data_sg; 1388 page_off = cmd->first_data_sg_off; 1389 1390 if (data_length && page_off) { 1391 struct scatterlist first_sg; 1392 u32 len = min_t(u32, data_length, sg->length - page_off); 1393 1394 sg_init_table(&first_sg, 1); 1395 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off); 1396 1397 ahash_request_set_crypt(hash, &first_sg, NULL, len); 1398 crypto_ahash_update(hash); 1399 1400 data_length -= len; 1401 sg = sg_next(sg); 1402 } 1403 1404 while (data_length) { 1405 u32 cur_len = min_t(u32, data_length, sg->length); 1406 1407 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1408 crypto_ahash_update(hash); 1409 1410 data_length -= cur_len; 1411 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1412 sg = sg_next(sg); 1413 } 1414 1415 if (padding) { 1416 struct scatterlist pad_sg; 1417 1418 sg_init_one(&pad_sg, pad_bytes, padding); 1419 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1420 padding); 1421 crypto_ahash_finup(hash); 1422 } else { 1423 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1424 crypto_ahash_final(hash); 1425 } 1426 1427 return data_crc; 1428} 1429 1430static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1431 const void *buf, u32 payload_length, u32 padding, 1432 const void *pad_bytes, void *data_crc) 1433{ 1434 struct scatterlist sg[2]; 1435 1436 sg_init_table(sg, ARRAY_SIZE(sg)); 1437 sg_set_buf(sg, buf, payload_length); 1438 if (padding) 1439 sg_set_buf(sg + 1, pad_bytes, padding); 1440 1441 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1442 1443 crypto_ahash_digest(hash); 1444} 1445 1446int 1447__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1448 struct iscsi_cmd *cmd, u32 payload_length, 1449 bool *success) 1450{ 1451 struct iscsi_data *hdr = buf; 1452 struct se_cmd *se_cmd; 1453 int rc; 1454 1455 /* iSCSI write */ 1456 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1457 1458 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1459 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1460 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1461 payload_length, conn->cid); 1462 1463 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1464 pr_err("Command ITT: 0x%08x received DataOUT after" 1465 " last DataOUT received, dumping payload\n", 1466 cmd->init_task_tag); 1467 return iscsit_dump_data_payload(conn, payload_length, 1); 1468 } 1469 1470 if (cmd->data_direction != DMA_TO_DEVICE) { 1471 pr_err("Command ITT: 0x%08x received DataOUT for a" 1472 " NON-WRITE command.\n", cmd->init_task_tag); 1473 return iscsit_dump_data_payload(conn, payload_length, 1); 1474 } 1475 se_cmd = &cmd->se_cmd; 1476 iscsit_mod_dataout_timer(cmd); 1477 1478 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1479 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1480 be32_to_cpu(hdr->offset), payload_length, 1481 cmd->se_cmd.data_length); 1482 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1483 } 1484 1485 if (cmd->unsolicited_data) { 1486 int dump_unsolicited_data = 0; 1487 1488 if (conn->sess->sess_ops->InitialR2T) { 1489 pr_err("Received unexpected unsolicited data" 1490 " while InitialR2T=Yes, protocol error.\n"); 1491 transport_send_check_condition_and_sense(&cmd->se_cmd, 1492 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1493 return -1; 1494 } 1495 /* 1496 * Special case for dealing with Unsolicited DataOUT 1497 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1498 * failures; 1499 */ 1500 1501 /* Something's amiss if we're not in WRITE_PENDING state... */ 1502 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1503 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1504 dump_unsolicited_data = 1; 1505 1506 if (dump_unsolicited_data) { 1507 /* 1508 * Check if a delayed TASK_ABORTED status needs to 1509 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1510 * received with the unsolicited data out. 1511 */ 1512 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1513 iscsit_stop_dataout_timer(cmd); 1514 1515 return iscsit_dump_data_payload(conn, payload_length, 1); 1516 } 1517 } else { 1518 /* 1519 * For the normal solicited data path: 1520 * 1521 * Check for a delayed TASK_ABORTED status and dump any 1522 * incoming data out payload if one exists. Also, when the 1523 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1524 * data out sequence, we decrement outstanding_r2ts. Once 1525 * outstanding_r2ts reaches zero, go ahead and send the delayed 1526 * TASK_ABORTED status. 1527 */ 1528 if (se_cmd->transport_state & CMD_T_ABORTED) { 1529 if (hdr->flags & ISCSI_FLAG_CMD_FINAL && 1530 --cmd->outstanding_r2ts < 1) 1531 iscsit_stop_dataout_timer(cmd); 1532 1533 return iscsit_dump_data_payload(conn, payload_length, 1); 1534 } 1535 } 1536 /* 1537 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1538 * within-command recovery checks before receiving the payload. 1539 */ 1540 rc = iscsit_check_pre_dataout(cmd, buf); 1541 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1542 return 0; 1543 else if (rc == DATAOUT_CANNOT_RECOVER) 1544 return -1; 1545 *success = true; 1546 return 0; 1547} 1548EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1549 1550int 1551iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf, 1552 struct iscsi_cmd **out_cmd) 1553{ 1554 struct iscsi_data *hdr = buf; 1555 struct iscsi_cmd *cmd; 1556 u32 payload_length = ntoh24(hdr->dlength); 1557 int rc; 1558 bool success = false; 1559 1560 if (!payload_length) { 1561 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1562 return 0; 1563 } 1564 1565 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1566 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1567 " MaxXmitDataSegmentLength: %u\n", payload_length, 1568 conn->conn_ops->MaxXmitDataSegmentLength); 1569 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1570 } 1571 1572 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1573 if (!cmd) 1574 return 0; 1575 1576 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1577 1578 if (success) 1579 *out_cmd = cmd; 1580 1581 return rc; 1582} 1583EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1584 1585static int 1586iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1587 struct iscsi_data *hdr) 1588{ 1589 struct kvec *iov; 1590 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1591 u32 payload_length; 1592 int iov_ret, data_crc_failed = 0; 1593 1594 payload_length = min_t(u32, cmd->se_cmd.data_length, 1595 ntoh24(hdr->dlength)); 1596 rx_size += payload_length; 1597 iov = &cmd->iov_data[0]; 1598 1599 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, 1600 be32_to_cpu(hdr->offset), payload_length); 1601 if (iov_ret < 0) 1602 return -1; 1603 1604 iov_count += iov_ret; 1605 1606 padding = ((-payload_length) & 3); 1607 if (padding != 0) { 1608 iov[iov_count].iov_base = cmd->pad_bytes; 1609 iov[iov_count++].iov_len = padding; 1610 rx_size += padding; 1611 pr_debug("Receiving %u padding bytes.\n", padding); 1612 } 1613 1614 if (conn->conn_ops->DataDigest) { 1615 iov[iov_count].iov_base = &checksum; 1616 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1617 rx_size += ISCSI_CRC_LEN; 1618 } 1619 1620 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 1621 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1622 1623 iscsit_unmap_iovec(cmd); 1624 1625 if (rx_got != rx_size) 1626 return -1; 1627 1628 if (conn->conn_ops->DataDigest) { 1629 u32 data_crc; 1630 1631 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1632 be32_to_cpu(hdr->offset), 1633 payload_length, padding, 1634 cmd->pad_bytes); 1635 1636 if (checksum != data_crc) { 1637 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1638 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1639 " does not match computed 0x%08x\n", 1640 hdr->itt, hdr->offset, payload_length, 1641 hdr->datasn, checksum, data_crc); 1642 data_crc_failed = 1; 1643 } else { 1644 pr_debug("Got CRC32C DataDigest 0x%08x for" 1645 " %u bytes of Data Out\n", checksum, 1646 payload_length); 1647 } 1648 } 1649 1650 return data_crc_failed; 1651} 1652 1653int 1654iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr, 1655 bool data_crc_failed) 1656{ 1657 struct iscsi_conn *conn = cmd->conn; 1658 int rc, ooo_cmdsn; 1659 /* 1660 * Increment post receive data and CRC values or perform 1661 * within-command recovery. 1662 */ 1663 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1664 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1665 return 0; 1666 else if (rc == DATAOUT_SEND_R2T) { 1667 iscsit_set_dataout_sequence_values(cmd); 1668 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1669 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1670 /* 1671 * Handle extra special case for out of order 1672 * Unsolicited Data Out. 1673 */ 1674 spin_lock_bh(&cmd->istate_lock); 1675 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1676 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1677 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1678 spin_unlock_bh(&cmd->istate_lock); 1679 1680 iscsit_stop_dataout_timer(cmd); 1681 if (ooo_cmdsn) 1682 return 0; 1683 target_execute_cmd(&cmd->se_cmd); 1684 return 0; 1685 } else /* DATAOUT_CANNOT_RECOVER */ 1686 return -1; 1687 1688 return 0; 1689} 1690EXPORT_SYMBOL(iscsit_check_dataout_payload); 1691 1692static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf) 1693{ 1694 struct iscsi_cmd *cmd = NULL; 1695 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1696 int rc; 1697 bool data_crc_failed = false; 1698 1699 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1700 if (rc < 0) 1701 return 0; 1702 else if (!cmd) 1703 return 0; 1704 1705 rc = iscsit_get_dataout(conn, cmd, hdr); 1706 if (rc < 0) 1707 return rc; 1708 else if (rc > 0) 1709 data_crc_failed = true; 1710 1711 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1712} 1713 1714int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1715 struct iscsi_nopout *hdr) 1716{ 1717 u32 payload_length = ntoh24(hdr->dlength); 1718 1719 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1720 pr_err("NopOUT Flag's, Left Most Bit 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 (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1730 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1731 " not set, protocol error.\n"); 1732 if (!cmd) 1733 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1734 (unsigned char *)hdr); 1735 1736 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1737 (unsigned char *)hdr); 1738 } 1739 1740 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1741 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1742 " greater than MaxXmitDataSegmentLength: %u, protocol" 1743 " error.\n", payload_length, 1744 conn->conn_ops->MaxXmitDataSegmentLength); 1745 if (!cmd) 1746 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1747 (unsigned char *)hdr); 1748 1749 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1750 (unsigned char *)hdr); 1751 } 1752 1753 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1754 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1755 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1756 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1757 payload_length); 1758 /* 1759 * This is not a response to a Unsolicited NopIN, which means 1760 * it can either be a NOPOUT ping request (with a valid ITT), 1761 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1762 * Either way, make sure we allocate an struct iscsi_cmd, as both 1763 * can contain ping data. 1764 */ 1765 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1766 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1767 cmd->i_state = ISTATE_SEND_NOPIN; 1768 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1769 1 : 0); 1770 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1771 cmd->targ_xfer_tag = 0xFFFFFFFF; 1772 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1773 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1774 cmd->data_direction = DMA_NONE; 1775 } 1776 1777 return 0; 1778} 1779EXPORT_SYMBOL(iscsit_setup_nop_out); 1780 1781int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1782 struct iscsi_nopout *hdr) 1783{ 1784 struct iscsi_cmd *cmd_p = NULL; 1785 int cmdsn_ret = 0; 1786 /* 1787 * Initiator is expecting a NopIN ping reply.. 1788 */ 1789 if (hdr->itt != RESERVED_ITT) { 1790 if (!cmd) 1791 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1792 (unsigned char *)hdr); 1793 1794 spin_lock_bh(&conn->cmd_lock); 1795 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1796 spin_unlock_bh(&conn->cmd_lock); 1797 1798 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1799 1800 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1801 iscsit_add_cmd_to_response_queue(cmd, conn, 1802 cmd->i_state); 1803 return 0; 1804 } 1805 1806 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1807 (unsigned char *)hdr, hdr->cmdsn); 1808 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1809 return 0; 1810 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1811 return -1; 1812 1813 return 0; 1814 } 1815 /* 1816 * This was a response to a unsolicited NOPIN ping. 1817 */ 1818 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1819 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1820 if (!cmd_p) 1821 return -EINVAL; 1822 1823 iscsit_stop_nopin_response_timer(conn); 1824 1825 cmd_p->i_state = ISTATE_REMOVE; 1826 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1827 1828 iscsit_start_nopin_timer(conn); 1829 return 0; 1830 } 1831 /* 1832 * Otherwise, initiator is not expecting a NOPIN is response. 1833 * Just ignore for now. 1834 */ 1835 1836 if (cmd) 1837 iscsit_free_cmd(cmd, false); 1838 1839 return 0; 1840} 1841EXPORT_SYMBOL(iscsit_process_nop_out); 1842 1843static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1844 unsigned char *buf) 1845{ 1846 unsigned char *ping_data = NULL; 1847 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1848 struct kvec *iov = NULL; 1849 u32 payload_length = ntoh24(hdr->dlength); 1850 int ret; 1851 1852 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1853 if (ret < 0) 1854 return 0; 1855 /* 1856 * Handle NOP-OUT payload for traditional iSCSI sockets 1857 */ 1858 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1859 u32 checksum, data_crc, padding = 0; 1860 int niov = 0, rx_got, rx_size = payload_length; 1861 1862 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1863 if (!ping_data) { 1864 ret = -1; 1865 goto out; 1866 } 1867 1868 iov = &cmd->iov_misc[0]; 1869 iov[niov].iov_base = ping_data; 1870 iov[niov++].iov_len = payload_length; 1871 1872 padding = ((-payload_length) & 3); 1873 if (padding != 0) { 1874 pr_debug("Receiving %u additional bytes" 1875 " for padding.\n", padding); 1876 iov[niov].iov_base = &cmd->pad_bytes; 1877 iov[niov++].iov_len = padding; 1878 rx_size += padding; 1879 } 1880 if (conn->conn_ops->DataDigest) { 1881 iov[niov].iov_base = &checksum; 1882 iov[niov++].iov_len = ISCSI_CRC_LEN; 1883 rx_size += ISCSI_CRC_LEN; 1884 } 1885 1886 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); 1887 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1888 if (rx_got != rx_size) { 1889 ret = -1; 1890 goto out; 1891 } 1892 1893 if (conn->conn_ops->DataDigest) { 1894 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1895 payload_length, padding, 1896 cmd->pad_bytes, &data_crc); 1897 1898 if (checksum != data_crc) { 1899 pr_err("Ping data CRC32C DataDigest" 1900 " 0x%08x does not match computed 0x%08x\n", 1901 checksum, data_crc); 1902 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1903 pr_err("Unable to recover from" 1904 " NOPOUT Ping DataCRC failure while in" 1905 " ERL=0.\n"); 1906 ret = -1; 1907 goto out; 1908 } else { 1909 /* 1910 * Silently drop this PDU and let the 1911 * initiator plug the CmdSN gap. 1912 */ 1913 pr_debug("Dropping NOPOUT" 1914 " Command CmdSN: 0x%08x due to" 1915 " DataCRC error.\n", hdr->cmdsn); 1916 ret = 0; 1917 goto out; 1918 } 1919 } else { 1920 pr_debug("Got CRC32C DataDigest" 1921 " 0x%08x for %u bytes of ping data.\n", 1922 checksum, payload_length); 1923 } 1924 } 1925 1926 ping_data[payload_length] = '\0'; 1927 /* 1928 * Attach ping data to struct iscsi_cmd->buf_ptr. 1929 */ 1930 cmd->buf_ptr = ping_data; 1931 cmd->buf_ptr_size = payload_length; 1932 1933 pr_debug("Got %u bytes of NOPOUT ping" 1934 " data.\n", payload_length); 1935 pr_debug("Ping Data: \"%s\"\n", ping_data); 1936 } 1937 1938 return iscsit_process_nop_out(conn, cmd, hdr); 1939out: 1940 if (cmd) 1941 iscsit_free_cmd(cmd, false); 1942 1943 kfree(ping_data); 1944 return ret; 1945} 1946 1947static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1948{ 1949 switch (iscsi_tmf) { 1950 case ISCSI_TM_FUNC_ABORT_TASK: 1951 return TMR_ABORT_TASK; 1952 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1953 return TMR_ABORT_TASK_SET; 1954 case ISCSI_TM_FUNC_CLEAR_ACA: 1955 return TMR_CLEAR_ACA; 1956 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1957 return TMR_CLEAR_TASK_SET; 1958 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1959 return TMR_LUN_RESET; 1960 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1961 return TMR_TARGET_WARM_RESET; 1962 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1963 return TMR_TARGET_COLD_RESET; 1964 default: 1965 return TMR_UNKNOWN; 1966 } 1967} 1968 1969int 1970iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 1971 unsigned char *buf) 1972{ 1973 struct se_tmr_req *se_tmr; 1974 struct iscsi_tmr_req *tmr_req; 1975 struct iscsi_tm *hdr; 1976 int out_of_order_cmdsn = 0, ret; 1977 u8 function, tcm_function = TMR_UNKNOWN; 1978 1979 hdr = (struct iscsi_tm *) buf; 1980 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 1981 function = hdr->flags; 1982 1983 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 1984 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 1985 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 1986 hdr->rtt, hdr->refcmdsn, conn->cid); 1987 1988 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 1989 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 1990 hdr->rtt != RESERVED_ITT)) { 1991 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 1992 hdr->rtt = RESERVED_ITT; 1993 } 1994 1995 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 1996 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1997 pr_err("Task Management Request TASK_REASSIGN not" 1998 " issued as immediate command, bad iSCSI Initiator" 1999 "implementation\n"); 2000 return iscsit_add_reject_cmd(cmd, 2001 ISCSI_REASON_PROTOCOL_ERROR, buf); 2002 } 2003 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2004 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 2005 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 2006 2007 cmd->data_direction = DMA_NONE; 2008 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 2009 if (!cmd->tmr_req) { 2010 return iscsit_add_reject_cmd(cmd, 2011 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2012 buf); 2013 } 2014 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 scsilun_to_int(&hdr->lun)); 2019 2020 target_get_sess_cmd(&cmd->se_cmd, true); 2021 2022 /* 2023 * TASK_REASSIGN for ERL=2 / connection stays inside of 2024 * LIO-Target $FABRIC_MOD 2025 */ 2026 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2027 tcm_function = iscsit_convert_tmf(function); 2028 if (tcm_function == TMR_UNKNOWN) { 2029 pr_err("Unknown iSCSI TMR Function:" 2030 " 0x%02x\n", function); 2031 return iscsit_add_reject_cmd(cmd, 2032 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2033 } 2034 } 2035 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2036 GFP_KERNEL); 2037 if (ret < 0) 2038 return iscsit_add_reject_cmd(cmd, 2039 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2040 2041 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2042 2043 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2044 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2045 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2046 cmd->init_task_tag = hdr->itt; 2047 cmd->targ_xfer_tag = 0xFFFFFFFF; 2048 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2049 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2050 se_tmr = cmd->se_cmd.se_tmr_req; 2051 tmr_req = cmd->tmr_req; 2052 /* 2053 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2054 */ 2055 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2056 ret = transport_lookup_tmr_lun(&cmd->se_cmd); 2057 if (ret < 0) { 2058 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2059 goto attach; 2060 } 2061 } 2062 2063 switch (function) { 2064 case ISCSI_TM_FUNC_ABORT_TASK: 2065 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2066 if (se_tmr->response) 2067 goto attach; 2068 break; 2069 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2070 case ISCSI_TM_FUNC_CLEAR_ACA: 2071 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2072 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2073 break; 2074 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2075 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2076 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2077 goto attach; 2078 } 2079 break; 2080 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2081 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2082 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2083 goto attach; 2084 } 2085 break; 2086 case ISCSI_TM_FUNC_TASK_REASSIGN: 2087 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2088 /* 2089 * Perform sanity checks on the ExpDataSN only if the 2090 * TASK_REASSIGN was successful. 2091 */ 2092 if (se_tmr->response) 2093 break; 2094 2095 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2096 return iscsit_add_reject_cmd(cmd, 2097 ISCSI_REASON_BOOKMARK_INVALID, buf); 2098 break; 2099 default: 2100 pr_err("Unknown TMR function: 0x%02x, protocol" 2101 " error.\n", function); 2102 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2103 goto attach; 2104 } 2105 2106 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2107 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2108 se_tmr->call_transport = 1; 2109attach: 2110 spin_lock_bh(&conn->cmd_lock); 2111 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2112 spin_unlock_bh(&conn->cmd_lock); 2113 2114 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2115 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2116 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2117 out_of_order_cmdsn = 1; 2118 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2119 target_put_sess_cmd(&cmd->se_cmd); 2120 return 0; 2121 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2122 return -1; 2123 } 2124 } 2125 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2126 2127 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2128 return 0; 2129 /* 2130 * Found the referenced task, send to transport for processing. 2131 */ 2132 if (se_tmr->call_transport) 2133 return transport_generic_handle_tmr(&cmd->se_cmd); 2134 2135 /* 2136 * Could not find the referenced LUN, task, or Task Management 2137 * command not authorized or supported. Change state and 2138 * let the tx_thread send the response. 2139 * 2140 * For connection recovery, this is also the default action for 2141 * TMR TASK_REASSIGN. 2142 */ 2143 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2144 target_put_sess_cmd(&cmd->se_cmd); 2145 return 0; 2146} 2147EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2148 2149/* #warning FIXME: Support Text Command parameters besides SendTargets */ 2150int 2151iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2152 struct iscsi_text *hdr) 2153{ 2154 u32 payload_length = ntoh24(hdr->dlength); 2155 2156 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2157 pr_err("Unable to accept text parameter length: %u" 2158 "greater than MaxXmitDataSegmentLength %u.\n", 2159 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2160 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2161 (unsigned char *)hdr); 2162 } 2163 2164 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2165 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2166 pr_err("Multi sequence text commands currently not supported\n"); 2167 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2168 (unsigned char *)hdr); 2169 } 2170 2171 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2172 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2173 hdr->exp_statsn, payload_length); 2174 2175 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2176 cmd->i_state = ISTATE_SEND_TEXTRSP; 2177 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2178 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2179 cmd->targ_xfer_tag = 0xFFFFFFFF; 2180 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2181 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2182 cmd->data_direction = DMA_NONE; 2183 kfree(cmd->text_in_ptr); 2184 cmd->text_in_ptr = NULL; 2185 2186 return 0; 2187} 2188EXPORT_SYMBOL(iscsit_setup_text_cmd); 2189 2190int 2191iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2192 struct iscsi_text *hdr) 2193{ 2194 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2195 int cmdsn_ret; 2196 2197 if (!text_in) { 2198 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2199 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2200 pr_err("Unable to locate text_in buffer for sendtargets" 2201 " discovery\n"); 2202 goto reject; 2203 } 2204 goto empty_sendtargets; 2205 } 2206 if (strncmp("SendTargets=", text_in, 12) != 0) { 2207 pr_err("Received Text Data that is not" 2208 " SendTargets, cannot continue.\n"); 2209 goto reject; 2210 } 2211 /* '=' confirmed in strncmp */ 2212 text_ptr = strchr(text_in, '='); 2213 BUG_ON(!text_ptr); 2214 if (!strncmp("=All", text_ptr, 5)) { 2215 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2216 } else if (!strncmp("=iqn.", text_ptr, 5) || 2217 !strncmp("=eui.", text_ptr, 5)) { 2218 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2219 } else { 2220 pr_err("Unable to locate valid SendTargets%s value\n", 2221 text_ptr); 2222 goto reject; 2223 } 2224 2225 spin_lock_bh(&conn->cmd_lock); 2226 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2227 spin_unlock_bh(&conn->cmd_lock); 2228 2229empty_sendtargets: 2230 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2231 2232 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2233 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2234 (unsigned char *)hdr, hdr->cmdsn); 2235 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2236 return -1; 2237 2238 return 0; 2239 } 2240 2241 return iscsit_execute_cmd(cmd, 0); 2242 2243reject: 2244 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2245 (unsigned char *)hdr); 2246} 2247EXPORT_SYMBOL(iscsit_process_text_cmd); 2248 2249static int 2250iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2251 unsigned char *buf) 2252{ 2253 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2254 char *text_in = NULL; 2255 u32 payload_length = ntoh24(hdr->dlength); 2256 int rx_size, rc; 2257 2258 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2259 if (rc < 0) 2260 return 0; 2261 2262 rx_size = payload_length; 2263 if (payload_length) { 2264 u32 checksum = 0, data_crc = 0; 2265 u32 padding = 0; 2266 int niov = 0, rx_got; 2267 struct kvec iov[2]; 2268 2269 rx_size = ALIGN(payload_length, 4); 2270 text_in = kzalloc(rx_size, GFP_KERNEL); 2271 if (!text_in) 2272 goto reject; 2273 2274 cmd->text_in_ptr = text_in; 2275 2276 memset(iov, 0, sizeof(iov)); 2277 iov[niov].iov_base = text_in; 2278 iov[niov++].iov_len = rx_size; 2279 2280 padding = rx_size - payload_length; 2281 if (padding) 2282 pr_debug("Receiving %u additional bytes" 2283 " for padding.\n", padding); 2284 if (conn->conn_ops->DataDigest) { 2285 iov[niov].iov_base = &checksum; 2286 iov[niov++].iov_len = ISCSI_CRC_LEN; 2287 rx_size += ISCSI_CRC_LEN; 2288 } 2289 2290 WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); 2291 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2292 if (rx_got != rx_size) 2293 goto reject; 2294 2295 if (conn->conn_ops->DataDigest) { 2296 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2297 text_in, rx_size, 0, NULL, 2298 &data_crc); 2299 2300 if (checksum != data_crc) { 2301 pr_err("Text data CRC32C DataDigest" 2302 " 0x%08x does not match computed" 2303 " 0x%08x\n", checksum, data_crc); 2304 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2305 pr_err("Unable to recover from" 2306 " Text Data digest failure while in" 2307 " ERL=0.\n"); 2308 goto reject; 2309 } else { 2310 /* 2311 * Silently drop this PDU and let the 2312 * initiator plug the CmdSN gap. 2313 */ 2314 pr_debug("Dropping Text" 2315 " Command CmdSN: 0x%08x due to" 2316 " DataCRC error.\n", hdr->cmdsn); 2317 kfree(text_in); 2318 return 0; 2319 } 2320 } else { 2321 pr_debug("Got CRC32C DataDigest" 2322 " 0x%08x for %u bytes of text data.\n", 2323 checksum, payload_length); 2324 } 2325 } 2326 text_in[payload_length - 1] = '\0'; 2327 pr_debug("Successfully read %d bytes of text" 2328 " data.\n", payload_length); 2329 } 2330 2331 return iscsit_process_text_cmd(conn, cmd, hdr); 2332 2333reject: 2334 kfree(cmd->text_in_ptr); 2335 cmd->text_in_ptr = NULL; 2336 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2337} 2338 2339int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2340{ 2341 struct iscsi_conn *conn_p; 2342 struct iscsi_session *sess = conn->sess; 2343 2344 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2345 " for SID: %u.\n", conn->cid, conn->sess->sid); 2346 2347 atomic_set(&sess->session_logout, 1); 2348 atomic_set(&conn->conn_logout_remove, 1); 2349 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2350 2351 iscsit_inc_conn_usage_count(conn); 2352 iscsit_inc_session_usage_count(sess); 2353 2354 spin_lock_bh(&sess->conn_lock); 2355 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2356 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2357 continue; 2358 2359 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2360 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2361 } 2362 spin_unlock_bh(&sess->conn_lock); 2363 2364 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2365 2366 return 0; 2367} 2368 2369int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2370{ 2371 struct iscsi_conn *l_conn; 2372 struct iscsi_session *sess = conn->sess; 2373 2374 pr_debug("Received logout request CLOSECONNECTION for CID:" 2375 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2376 2377 /* 2378 * A Logout Request with a CLOSECONNECTION reason code for a CID 2379 * can arrive on a connection with a differing CID. 2380 */ 2381 if (conn->cid == cmd->logout_cid) { 2382 spin_lock_bh(&conn->state_lock); 2383 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2384 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2385 2386 atomic_set(&conn->conn_logout_remove, 1); 2387 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2388 iscsit_inc_conn_usage_count(conn); 2389 2390 spin_unlock_bh(&conn->state_lock); 2391 } else { 2392 /* 2393 * Handle all different cid CLOSECONNECTION requests in 2394 * iscsit_logout_post_handler_diffcid() as to give enough 2395 * time for any non immediate command's CmdSN to be 2396 * acknowledged on the connection in question. 2397 * 2398 * Here we simply make sure the CID is still around. 2399 */ 2400 l_conn = iscsit_get_conn_from_cid(sess, 2401 cmd->logout_cid); 2402 if (!l_conn) { 2403 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2404 iscsit_add_cmd_to_response_queue(cmd, conn, 2405 cmd->i_state); 2406 return 0; 2407 } 2408 2409 iscsit_dec_conn_usage_count(l_conn); 2410 } 2411 2412 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2413 2414 return 0; 2415} 2416 2417int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2418{ 2419 struct iscsi_session *sess = conn->sess; 2420 2421 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2422 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2423 2424 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2425 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2426 " while ERL!=2.\n"); 2427 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2428 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2429 return 0; 2430 } 2431 2432 if (conn->cid == cmd->logout_cid) { 2433 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2434 " with CID: %hu on CID: %hu, implementation error.\n", 2435 cmd->logout_cid, conn->cid); 2436 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2437 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2438 return 0; 2439 } 2440 2441 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2442 2443 return 0; 2444} 2445 2446int 2447iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 2448 unsigned char *buf) 2449{ 2450 int cmdsn_ret, logout_remove = 0; 2451 u8 reason_code = 0; 2452 struct iscsi_logout *hdr; 2453 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2454 2455 hdr = (struct iscsi_logout *) buf; 2456 reason_code = (hdr->flags & 0x7f); 2457 2458 if (tiqn) { 2459 spin_lock(&tiqn->logout_stats.lock); 2460 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2461 tiqn->logout_stats.normal_logouts++; 2462 else 2463 tiqn->logout_stats.abnormal_logouts++; 2464 spin_unlock(&tiqn->logout_stats.lock); 2465 } 2466 2467 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2468 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2469 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2470 hdr->cid, conn->cid); 2471 2472 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2473 pr_err("Received logout request on connection that" 2474 " is not in logged in state, ignoring request.\n"); 2475 iscsit_free_cmd(cmd, false); 2476 return 0; 2477 } 2478 2479 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2480 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2481 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2482 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2483 cmd->targ_xfer_tag = 0xFFFFFFFF; 2484 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2485 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2486 cmd->logout_cid = be16_to_cpu(hdr->cid); 2487 cmd->logout_reason = reason_code; 2488 cmd->data_direction = DMA_NONE; 2489 2490 /* 2491 * We need to sleep in these cases (by returning 1) until the Logout 2492 * Response gets sent in the tx thread. 2493 */ 2494 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2495 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2496 be16_to_cpu(hdr->cid) == conn->cid)) 2497 logout_remove = 1; 2498 2499 spin_lock_bh(&conn->cmd_lock); 2500 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2501 spin_unlock_bh(&conn->cmd_lock); 2502 2503 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2504 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2505 2506 /* 2507 * Immediate commands are executed, well, immediately. 2508 * Non-Immediate Logout Commands are executed in CmdSN order. 2509 */ 2510 if (cmd->immediate_cmd) { 2511 int ret = iscsit_execute_cmd(cmd, 0); 2512 2513 if (ret < 0) 2514 return ret; 2515 } else { 2516 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2517 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2518 logout_remove = 0; 2519 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2520 return -1; 2521 } 2522 2523 return logout_remove; 2524} 2525EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2526 2527int iscsit_handle_snack( 2528 struct iscsi_conn *conn, 2529 unsigned char *buf) 2530{ 2531 struct iscsi_snack *hdr; 2532 2533 hdr = (struct iscsi_snack *) buf; 2534 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2535 2536 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2537 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2538 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2539 hdr->begrun, hdr->runlength, conn->cid); 2540 2541 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2542 pr_err("Initiator sent SNACK request while in" 2543 " ErrorRecoveryLevel=0.\n"); 2544 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2545 buf); 2546 } 2547 /* 2548 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2549 * call from inside iscsi_send_recovery_datain_or_r2t(). 2550 */ 2551 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2552 case 0: 2553 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2554 hdr->itt, 2555 be32_to_cpu(hdr->ttt), 2556 be32_to_cpu(hdr->begrun), 2557 be32_to_cpu(hdr->runlength)); 2558 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2559 return iscsit_handle_status_snack(conn, hdr->itt, 2560 be32_to_cpu(hdr->ttt), 2561 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2562 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2563 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2564 be32_to_cpu(hdr->begrun), 2565 be32_to_cpu(hdr->runlength)); 2566 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2567 /* FIXME: Support R-Data SNACK */ 2568 pr_err("R-Data SNACK Not Supported.\n"); 2569 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2570 buf); 2571 default: 2572 pr_err("Unknown SNACK type 0x%02x, protocol" 2573 " error.\n", hdr->flags & 0x0f); 2574 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2575 buf); 2576 } 2577 2578 return 0; 2579} 2580EXPORT_SYMBOL(iscsit_handle_snack); 2581 2582static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn) 2583{ 2584 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2585 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2586 wait_for_completion_interruptible_timeout( 2587 &conn->rx_half_close_comp, 2588 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2589 } 2590} 2591 2592static int iscsit_handle_immediate_data( 2593 struct iscsi_cmd *cmd, 2594 struct iscsi_scsi_req *hdr, 2595 u32 length) 2596{ 2597 int iov_ret, rx_got = 0, rx_size = 0; 2598 u32 checksum, iov_count = 0, padding = 0; 2599 struct iscsi_conn *conn = cmd->conn; 2600 struct kvec *iov; 2601 void *overflow_buf = NULL; 2602 2603 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2604 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2605 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2606 cmd->orig_iov_data_count - 2, 2607 cmd->write_data_done, rx_size); 2608 if (iov_ret < 0) 2609 return IMMEDIATE_DATA_CANNOT_RECOVER; 2610 2611 iov_count = iov_ret; 2612 iov = &cmd->iov_data[0]; 2613 if (rx_size < length) { 2614 /* 2615 * Special case: length of immediate data exceeds the data 2616 * buffer size derived from the CDB. 2617 */ 2618 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2619 if (!overflow_buf) { 2620 iscsit_unmap_iovec(cmd); 2621 return IMMEDIATE_DATA_CANNOT_RECOVER; 2622 } 2623 cmd->overflow_buf = overflow_buf; 2624 iov[iov_count].iov_base = overflow_buf; 2625 iov[iov_count].iov_len = length - rx_size; 2626 iov_count++; 2627 rx_size = length; 2628 } 2629 2630 padding = ((-length) & 3); 2631 if (padding != 0) { 2632 iov[iov_count].iov_base = cmd->pad_bytes; 2633 iov[iov_count++].iov_len = padding; 2634 rx_size += padding; 2635 } 2636 2637 if (conn->conn_ops->DataDigest) { 2638 iov[iov_count].iov_base = &checksum; 2639 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2640 rx_size += ISCSI_CRC_LEN; 2641 } 2642 2643 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2644 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2645 2646 iscsit_unmap_iovec(cmd); 2647 2648 if (rx_got != rx_size) { 2649 iscsit_rx_thread_wait_for_tcp(conn); 2650 return IMMEDIATE_DATA_CANNOT_RECOVER; 2651 } 2652 2653 if (conn->conn_ops->DataDigest) { 2654 u32 data_crc; 2655 2656 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2657 cmd->write_data_done, length, padding, 2658 cmd->pad_bytes); 2659 2660 if (checksum != data_crc) { 2661 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2662 " does not match computed 0x%08x\n", checksum, 2663 data_crc); 2664 2665 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2666 pr_err("Unable to recover from" 2667 " Immediate Data digest failure while" 2668 " in ERL=0.\n"); 2669 iscsit_reject_cmd(cmd, 2670 ISCSI_REASON_DATA_DIGEST_ERROR, 2671 (unsigned char *)hdr); 2672 return IMMEDIATE_DATA_CANNOT_RECOVER; 2673 } else { 2674 iscsit_reject_cmd(cmd, 2675 ISCSI_REASON_DATA_DIGEST_ERROR, 2676 (unsigned char *)hdr); 2677 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2678 } 2679 } else { 2680 pr_debug("Got CRC32C DataDigest 0x%08x for" 2681 " %u bytes of Immediate Data\n", checksum, 2682 length); 2683 } 2684 } 2685 2686 cmd->write_data_done += length; 2687 2688 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2689 spin_lock_bh(&cmd->istate_lock); 2690 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2691 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2692 spin_unlock_bh(&cmd->istate_lock); 2693 } 2694 2695 return IMMEDIATE_DATA_NORMAL_OPERATION; 2696} 2697 2698/* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2699 with active network interface */ 2700static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn) 2701{ 2702 struct iscsi_cmd *cmd; 2703 struct iscsi_conn *conn_p; 2704 bool found = false; 2705 2706 lockdep_assert_held(&conn->sess->conn_lock); 2707 2708 /* 2709 * Only send a Asynchronous Message on connections whos network 2710 * interface is still functional. 2711 */ 2712 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2713 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2714 iscsit_inc_conn_usage_count(conn_p); 2715 found = true; 2716 break; 2717 } 2718 } 2719 2720 if (!found) 2721 return; 2722 2723 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2724 if (!cmd) { 2725 iscsit_dec_conn_usage_count(conn_p); 2726 return; 2727 } 2728 2729 cmd->logout_cid = conn->cid; 2730 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2731 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2732 2733 spin_lock_bh(&conn_p->cmd_lock); 2734 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2735 spin_unlock_bh(&conn_p->cmd_lock); 2736 2737 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2738 iscsit_dec_conn_usage_count(conn_p); 2739} 2740 2741static int iscsit_send_conn_drop_async_message( 2742 struct iscsi_cmd *cmd, 2743 struct iscsi_conn *conn) 2744{ 2745 struct iscsi_async *hdr; 2746 2747 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2748 2749 hdr = (struct iscsi_async *) cmd->pdu; 2750 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2751 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2752 cmd->init_task_tag = RESERVED_ITT; 2753 cmd->targ_xfer_tag = 0xFFFFFFFF; 2754 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2755 cmd->stat_sn = conn->stat_sn++; 2756 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2757 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2758 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2759 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2760 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2761 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2762 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2763 2764 pr_debug("Sending Connection Dropped Async Message StatSN:" 2765 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2766 cmd->logout_cid, conn->cid); 2767 2768 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2769} 2770 2771static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn) 2772{ 2773 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2774 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2775 wait_for_completion_interruptible_timeout( 2776 &conn->tx_half_close_comp, 2777 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2778 } 2779} 2780 2781void 2782iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2783 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2784 bool set_statsn) 2785{ 2786 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2787 hdr->flags = datain->flags; 2788 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2789 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2790 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2791 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2792 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2793 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2794 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2795 } 2796 } 2797 hton24(hdr->dlength, datain->length); 2798 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2799 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2800 (struct scsi_lun *)&hdr->lun); 2801 else 2802 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2803 2804 hdr->itt = cmd->init_task_tag; 2805 2806 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2807 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2808 else 2809 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2810 if (set_statsn) 2811 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2812 else 2813 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2814 2815 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2816 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2817 hdr->datasn = cpu_to_be32(datain->data_sn); 2818 hdr->offset = cpu_to_be32(datain->offset); 2819 2820 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2821 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2822 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2823 ntohl(hdr->offset), datain->length, conn->cid); 2824} 2825EXPORT_SYMBOL(iscsit_build_datain_pdu); 2826 2827static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2828{ 2829 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2830 struct iscsi_datain datain; 2831 struct iscsi_datain_req *dr; 2832 int eodr = 0, ret; 2833 bool set_statsn = false; 2834 2835 memset(&datain, 0, sizeof(struct iscsi_datain)); 2836 dr = iscsit_get_datain_values(cmd, &datain); 2837 if (!dr) { 2838 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2839 cmd->init_task_tag); 2840 return -1; 2841 } 2842 /* 2843 * Be paranoid and double check the logic for now. 2844 */ 2845 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2846 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2847 " datain.length: %u exceeds cmd->data_length: %u\n", 2848 cmd->init_task_tag, datain.offset, datain.length, 2849 cmd->se_cmd.data_length); 2850 return -1; 2851 } 2852 2853 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2854 /* 2855 * Special case for successfully execution w/ both DATAIN 2856 * and Sense Data. 2857 */ 2858 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2859 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2860 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2861 else { 2862 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2863 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2864 iscsit_increment_maxcmdsn(cmd, conn->sess); 2865 cmd->stat_sn = conn->stat_sn++; 2866 set_statsn = true; 2867 } else if (dr->dr_complete == 2868 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2869 set_statsn = true; 2870 } 2871 2872 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2873 2874 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2875 if (ret < 0) 2876 return ret; 2877 2878 if (dr->dr_complete) { 2879 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2880 2 : 1; 2881 iscsit_free_datain_req(cmd, dr); 2882 } 2883 2884 return eodr; 2885} 2886 2887int 2888iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2889 struct iscsi_logout_rsp *hdr) 2890{ 2891 struct iscsi_conn *logout_conn = NULL; 2892 struct iscsi_conn_recovery *cr = NULL; 2893 struct iscsi_session *sess = conn->sess; 2894 /* 2895 * The actual shutting down of Sessions and/or Connections 2896 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2897 * is done in scsi_logout_post_handler(). 2898 */ 2899 switch (cmd->logout_reason) { 2900 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2901 pr_debug("iSCSI session logout successful, setting" 2902 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2903 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2904 break; 2905 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2906 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2907 break; 2908 /* 2909 * For CLOSECONNECTION logout requests carrying 2910 * a matching logout CID -> local CID, the reference 2911 * for the local CID will have been incremented in 2912 * iscsi_logout_closeconnection(). 2913 * 2914 * For CLOSECONNECTION logout requests carrying 2915 * a different CID than the connection it arrived 2916 * on, the connection responding to cmd->logout_cid 2917 * is stopped in iscsit_logout_post_handler_diffcid(). 2918 */ 2919 2920 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2921 " successful.\n", cmd->logout_cid, conn->cid); 2922 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2923 break; 2924 case ISCSI_LOGOUT_REASON_RECOVERY: 2925 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2926 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2927 break; 2928 /* 2929 * If the connection is still active from our point of view 2930 * force connection recovery to occur. 2931 */ 2932 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2933 cmd->logout_cid); 2934 if (logout_conn) { 2935 iscsit_connection_reinstatement_rcfr(logout_conn); 2936 iscsit_dec_conn_usage_count(logout_conn); 2937 } 2938 2939 cr = iscsit_get_inactive_connection_recovery_entry( 2940 conn->sess, cmd->logout_cid); 2941 if (!cr) { 2942 pr_err("Unable to locate CID: %hu for" 2943 " REMOVECONNFORRECOVERY Logout Request.\n", 2944 cmd->logout_cid); 2945 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2946 break; 2947 } 2948 2949 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2950 2951 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2952 " for recovery for CID: %hu on CID: %hu successful.\n", 2953 cmd->logout_cid, conn->cid); 2954 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2955 break; 2956 default: 2957 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2958 cmd->logout_reason); 2959 return -1; 2960 } 2961 2962 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2963 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2964 hdr->response = cmd->logout_response; 2965 hdr->itt = cmd->init_task_tag; 2966 cmd->stat_sn = conn->stat_sn++; 2967 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2968 2969 iscsit_increment_maxcmdsn(cmd, conn->sess); 2970 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2971 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2972 2973 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 2974 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 2975 cmd->init_task_tag, cmd->stat_sn, hdr->response, 2976 cmd->logout_cid, conn->cid); 2977 2978 return 0; 2979} 2980EXPORT_SYMBOL(iscsit_build_logout_rsp); 2981 2982static int 2983iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 2984{ 2985 int rc; 2986 2987 rc = iscsit_build_logout_rsp(cmd, conn, 2988 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 2989 if (rc < 0) 2990 return rc; 2991 2992 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2993} 2994 2995void 2996iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 2997 struct iscsi_nopin *hdr, bool nopout_response) 2998{ 2999 hdr->opcode = ISCSI_OP_NOOP_IN; 3000 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3001 hton24(hdr->dlength, cmd->buf_ptr_size); 3002 if (nopout_response) 3003 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 3004 hdr->itt = cmd->init_task_tag; 3005 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3006 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 3007 conn->stat_sn; 3008 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3009 3010 if (nopout_response) 3011 iscsit_increment_maxcmdsn(cmd, conn->sess); 3012 3013 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3014 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3015 3016 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3017 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3018 "Solicited" : "Unsolicited", cmd->init_task_tag, 3019 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3020} 3021EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3022 3023/* 3024 * Unsolicited NOPIN, either requesting a response or not. 3025 */ 3026static int iscsit_send_unsolicited_nopin( 3027 struct iscsi_cmd *cmd, 3028 struct iscsi_conn *conn, 3029 int want_response) 3030{ 3031 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3032 int ret; 3033 3034 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3035 3036 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3037 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3038 3039 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3040 if (ret < 0) 3041 return ret; 3042 3043 spin_lock_bh(&cmd->istate_lock); 3044 cmd->i_state = want_response ? 3045 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3046 spin_unlock_bh(&cmd->istate_lock); 3047 3048 return 0; 3049} 3050 3051static int 3052iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3053{ 3054 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3055 3056 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3057 3058 /* 3059 * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr. 3060 * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size. 3061 */ 3062 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3063 3064 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3065 cmd->buf_ptr, 3066 cmd->buf_ptr_size); 3067} 3068 3069static int iscsit_send_r2t( 3070 struct iscsi_cmd *cmd, 3071 struct iscsi_conn *conn) 3072{ 3073 struct iscsi_r2t *r2t; 3074 struct iscsi_r2t_rsp *hdr; 3075 int ret; 3076 3077 r2t = iscsit_get_r2t_from_list(cmd); 3078 if (!r2t) 3079 return -1; 3080 3081 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3082 memset(hdr, 0, ISCSI_HDR_LEN); 3083 hdr->opcode = ISCSI_OP_R2T; 3084 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3085 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3086 (struct scsi_lun *)&hdr->lun); 3087 hdr->itt = cmd->init_task_tag; 3088 if (conn->conn_transport->iscsit_get_r2t_ttt) 3089 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3090 else 3091 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3092 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3093 hdr->statsn = cpu_to_be32(conn->stat_sn); 3094 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3095 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3096 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3097 hdr->data_offset = cpu_to_be32(r2t->offset); 3098 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3099 3100 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3101 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3102 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3103 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3104 r2t->offset, r2t->xfer_len, conn->cid); 3105 3106 spin_lock_bh(&cmd->r2t_lock); 3107 r2t->sent_r2t = 1; 3108 spin_unlock_bh(&cmd->r2t_lock); 3109 3110 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3111 if (ret < 0) { 3112 return ret; 3113 } 3114 3115 spin_lock_bh(&cmd->dataout_timeout_lock); 3116 iscsit_start_dataout_timer(cmd, conn); 3117 spin_unlock_bh(&cmd->dataout_timeout_lock); 3118 3119 return 0; 3120} 3121 3122/* 3123 * @recovery: If called from iscsi_task_reassign_complete_write() for 3124 * connection recovery. 3125 */ 3126int iscsit_build_r2ts_for_cmd( 3127 struct iscsi_conn *conn, 3128 struct iscsi_cmd *cmd, 3129 bool recovery) 3130{ 3131 int first_r2t = 1; 3132 u32 offset = 0, xfer_len = 0; 3133 3134 spin_lock_bh(&cmd->r2t_lock); 3135 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3136 spin_unlock_bh(&cmd->r2t_lock); 3137 return 0; 3138 } 3139 3140 if (conn->sess->sess_ops->DataSequenceInOrder && 3141 !recovery) 3142 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3143 3144 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3145 if (conn->sess->sess_ops->DataSequenceInOrder) { 3146 offset = cmd->r2t_offset; 3147 3148 if (first_r2t && recovery) { 3149 int new_data_end = offset + 3150 conn->sess->sess_ops->MaxBurstLength - 3151 cmd->next_burst_len; 3152 3153 if (new_data_end > cmd->se_cmd.data_length) 3154 xfer_len = cmd->se_cmd.data_length - offset; 3155 else 3156 xfer_len = 3157 conn->sess->sess_ops->MaxBurstLength - 3158 cmd->next_burst_len; 3159 } else { 3160 int new_data_end = offset + 3161 conn->sess->sess_ops->MaxBurstLength; 3162 3163 if (new_data_end > cmd->se_cmd.data_length) 3164 xfer_len = cmd->se_cmd.data_length - offset; 3165 else 3166 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3167 } 3168 3169 if ((s32)xfer_len < 0) { 3170 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3171 break; 3172 } 3173 3174 cmd->r2t_offset += xfer_len; 3175 3176 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3177 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3178 } else { 3179 struct iscsi_seq *seq; 3180 3181 seq = iscsit_get_seq_holder_for_r2t(cmd); 3182 if (!seq) { 3183 spin_unlock_bh(&cmd->r2t_lock); 3184 return -1; 3185 } 3186 3187 offset = seq->offset; 3188 xfer_len = seq->xfer_len; 3189 3190 if (cmd->seq_send_order == cmd->seq_count) 3191 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3192 } 3193 cmd->outstanding_r2ts++; 3194 first_r2t = 0; 3195 3196 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3197 spin_unlock_bh(&cmd->r2t_lock); 3198 return -1; 3199 } 3200 3201 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3202 break; 3203 } 3204 spin_unlock_bh(&cmd->r2t_lock); 3205 3206 return 0; 3207} 3208EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3209 3210void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3211 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3212{ 3213 if (inc_stat_sn) 3214 cmd->stat_sn = conn->stat_sn++; 3215 3216 atomic_long_inc(&conn->sess->rsp_pdus); 3217 3218 memset(hdr, 0, ISCSI_HDR_LEN); 3219 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3220 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3221 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3222 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3223 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3224 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3225 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3226 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3227 } 3228 hdr->response = cmd->iscsi_response; 3229 hdr->cmd_status = cmd->se_cmd.scsi_status; 3230 hdr->itt = cmd->init_task_tag; 3231 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3232 3233 iscsit_increment_maxcmdsn(cmd, conn->sess); 3234 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3235 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3236 3237 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3238 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3239 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3240 cmd->se_cmd.scsi_status, conn->cid); 3241} 3242EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3243 3244static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3245{ 3246 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3247 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3248 void *data_buf = NULL; 3249 u32 padding = 0, data_buf_len = 0; 3250 3251 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3252 3253 /* 3254 * Attach SENSE DATA payload to iSCSI Response PDU 3255 */ 3256 if (cmd->se_cmd.sense_buffer && 3257 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3258 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3259 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3260 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3261 3262 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3263 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3264 data_buf = cmd->sense_buffer; 3265 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3266 3267 if (padding) { 3268 memset(cmd->sense_buffer + 3269 cmd->se_cmd.scsi_sense_length, 0, padding); 3270 pr_debug("Adding %u bytes of padding to" 3271 " SENSE.\n", padding); 3272 } 3273 3274 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3275 " Response PDU\n", 3276 cmd->se_cmd.scsi_sense_length); 3277 } 3278 3279 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3280 data_buf_len); 3281} 3282 3283static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3284{ 3285 switch (se_tmr->response) { 3286 case TMR_FUNCTION_COMPLETE: 3287 return ISCSI_TMF_RSP_COMPLETE; 3288 case TMR_TASK_DOES_NOT_EXIST: 3289 return ISCSI_TMF_RSP_NO_TASK; 3290 case TMR_LUN_DOES_NOT_EXIST: 3291 return ISCSI_TMF_RSP_NO_LUN; 3292 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3293 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3294 case TMR_FUNCTION_REJECTED: 3295 default: 3296 return ISCSI_TMF_RSP_REJECTED; 3297 } 3298} 3299 3300void 3301iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3302 struct iscsi_tm_rsp *hdr) 3303{ 3304 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3305 3306 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3307 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3308 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3309 hdr->itt = cmd->init_task_tag; 3310 cmd->stat_sn = conn->stat_sn++; 3311 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3312 3313 iscsit_increment_maxcmdsn(cmd, conn->sess); 3314 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3315 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3316 3317 pr_debug("Built Task Management Response ITT: 0x%08x," 3318 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3319 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3320} 3321EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3322 3323static int 3324iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn) 3325{ 3326 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3327 3328 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3329 3330 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3331} 3332 3333#define SENDTARGETS_BUF_LIMIT 32768U 3334 3335static int 3336iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, 3337 enum iscsit_transport_type network_transport, 3338 int skip_bytes, bool *completed) 3339{ 3340 char *payload = NULL; 3341 struct iscsi_conn *conn = cmd->conn; 3342 struct iscsi_portal_group *tpg; 3343 struct iscsi_tiqn *tiqn; 3344 struct iscsi_tpg_np *tpg_np; 3345 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3346 int target_name_printed; 3347 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3348 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3349 bool active; 3350 3351 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3352 SENDTARGETS_BUF_LIMIT); 3353 3354 payload = kzalloc(buffer_len, GFP_KERNEL); 3355 if (!payload) 3356 return -ENOMEM; 3357 3358 /* 3359 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3360 * explicit case.. 3361 */ 3362 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3363 text_ptr = strchr(text_in, '='); 3364 if (!text_ptr) { 3365 pr_err("Unable to locate '=' string in text_in:" 3366 " %s\n", text_in); 3367 kfree(payload); 3368 return -EINVAL; 3369 } 3370 /* 3371 * Skip over '=' character.. 3372 */ 3373 text_ptr += 1; 3374 } 3375 3376 spin_lock(&tiqn_lock); 3377 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3378 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3379 strcmp(tiqn->tiqn, text_ptr)) { 3380 continue; 3381 } 3382 3383 target_name_printed = 0; 3384 3385 spin_lock(&tiqn->tiqn_tpg_lock); 3386 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3387 3388 /* If demo_mode_discovery=0 and generate_node_acls=0 3389 * (demo mode dislabed) do not return 3390 * TargetName+TargetAddress unless a NodeACL exists. 3391 */ 3392 3393 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3394 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3395 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3396 cmd->conn->sess->sess_ops->InitiatorName))) { 3397 continue; 3398 } 3399 3400 spin_lock(&tpg->tpg_state_lock); 3401 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3402 spin_unlock(&tpg->tpg_state_lock); 3403 3404 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3405 continue; 3406 3407 spin_lock(&tpg->tpg_np_lock); 3408 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3409 tpg_np_list) { 3410 struct iscsi_np *np = tpg_np->tpg_np; 3411 struct sockaddr_storage *sockaddr; 3412 3413 if (np->np_network_transport != network_transport) 3414 continue; 3415 3416 if (!target_name_printed) { 3417 len = sprintf(buf, "TargetName=%s", 3418 tiqn->tiqn); 3419 len += 1; 3420 3421 if ((len + payload_len) > buffer_len) { 3422 spin_unlock(&tpg->tpg_np_lock); 3423 spin_unlock(&tiqn->tiqn_tpg_lock); 3424 end_of_buf = 1; 3425 goto eob; 3426 } 3427 3428 if (skip_bytes && len <= skip_bytes) { 3429 skip_bytes -= len; 3430 } else { 3431 memcpy(payload + payload_len, buf, len); 3432 payload_len += len; 3433 target_name_printed = 1; 3434 if (len > skip_bytes) 3435 skip_bytes = 0; 3436 } 3437 } 3438 3439 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3440 sockaddr = &conn->local_sockaddr; 3441 else 3442 sockaddr = &np->np_sockaddr; 3443 3444 len = sprintf(buf, "TargetAddress=" 3445 "%pISpc,%hu", 3446 sockaddr, 3447 tpg->tpgt); 3448 len += 1; 3449 3450 if ((len + payload_len) > buffer_len) { 3451 spin_unlock(&tpg->tpg_np_lock); 3452 spin_unlock(&tiqn->tiqn_tpg_lock); 3453 end_of_buf = 1; 3454 goto eob; 3455 } 3456 3457 if (skip_bytes && len <= skip_bytes) { 3458 skip_bytes -= len; 3459 } else { 3460 memcpy(payload + payload_len, buf, len); 3461 payload_len += len; 3462 if (len > skip_bytes) 3463 skip_bytes = 0; 3464 } 3465 } 3466 spin_unlock(&tpg->tpg_np_lock); 3467 } 3468 spin_unlock(&tiqn->tiqn_tpg_lock); 3469eob: 3470 if (end_of_buf) { 3471 *completed = false; 3472 break; 3473 } 3474 3475 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3476 break; 3477 } 3478 spin_unlock(&tiqn_lock); 3479 3480 cmd->buf_ptr = payload; 3481 3482 return payload_len; 3483} 3484 3485int 3486iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3487 struct iscsi_text_rsp *hdr, 3488 enum iscsit_transport_type network_transport) 3489{ 3490 int text_length, padding; 3491 bool completed = true; 3492 3493 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3494 cmd->read_data_done, 3495 &completed); 3496 if (text_length < 0) 3497 return text_length; 3498 3499 if (completed) { 3500 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3501 } else { 3502 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3503 cmd->read_data_done += text_length; 3504 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3505 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3506 } 3507 hdr->opcode = ISCSI_OP_TEXT_RSP; 3508 padding = ((-text_length) & 3); 3509 hton24(hdr->dlength, text_length); 3510 hdr->itt = cmd->init_task_tag; 3511 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3512 cmd->stat_sn = conn->stat_sn++; 3513 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3514 3515 iscsit_increment_maxcmdsn(cmd, conn->sess); 3516 /* 3517 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3518 * correctly increment MaxCmdSN for each response answering a 3519 * non immediate text request with a valid CmdSN. 3520 */ 3521 cmd->maxcmdsn_inc = 0; 3522 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3523 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3524 3525 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3526 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3527 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3528 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3529 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3530 3531 return text_length + padding; 3532} 3533EXPORT_SYMBOL(iscsit_build_text_rsp); 3534 3535static int iscsit_send_text_rsp( 3536 struct iscsi_cmd *cmd, 3537 struct iscsi_conn *conn) 3538{ 3539 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3540 int text_length; 3541 3542 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3543 conn->conn_transport->transport_type); 3544 if (text_length < 0) 3545 return text_length; 3546 3547 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3548 cmd->buf_ptr, 3549 text_length); 3550} 3551 3552void 3553iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn, 3554 struct iscsi_reject *hdr) 3555{ 3556 hdr->opcode = ISCSI_OP_REJECT; 3557 hdr->reason = cmd->reject_reason; 3558 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3559 hton24(hdr->dlength, ISCSI_HDR_LEN); 3560 hdr->ffffffff = cpu_to_be32(0xffffffff); 3561 cmd->stat_sn = conn->stat_sn++; 3562 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3563 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3564 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3565 3566} 3567EXPORT_SYMBOL(iscsit_build_reject); 3568 3569static int iscsit_send_reject( 3570 struct iscsi_cmd *cmd, 3571 struct iscsi_conn *conn) 3572{ 3573 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3574 3575 iscsit_build_reject(cmd, conn, hdr); 3576 3577 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3578 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3579 3580 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3581 cmd->buf_ptr, 3582 ISCSI_HDR_LEN); 3583} 3584 3585void iscsit_thread_get_cpumask(struct iscsi_conn *conn) 3586{ 3587 int ord, cpu; 3588 /* 3589 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3590 * within iscsit_start_kthreads() 3591 * 3592 * Here we use bitmap_id to determine which CPU that this 3593 * iSCSI connection's RX/TX threads will be scheduled to 3594 * execute upon. 3595 */ 3596 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3597 for_each_online_cpu(cpu) { 3598 if (ord-- == 0) { 3599 cpumask_set_cpu(cpu, conn->conn_cpumask); 3600 return; 3601 } 3602 } 3603 /* 3604 * This should never be reached.. 3605 */ 3606 dump_stack(); 3607 cpumask_setall(conn->conn_cpumask); 3608} 3609 3610int 3611iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3612{ 3613 int ret; 3614 3615 switch (state) { 3616 case ISTATE_SEND_R2T: 3617 ret = iscsit_send_r2t(cmd, conn); 3618 if (ret < 0) 3619 goto err; 3620 break; 3621 case ISTATE_REMOVE: 3622 spin_lock_bh(&conn->cmd_lock); 3623 list_del_init(&cmd->i_conn_node); 3624 spin_unlock_bh(&conn->cmd_lock); 3625 3626 iscsit_free_cmd(cmd, false); 3627 break; 3628 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3629 iscsit_mod_nopin_response_timer(conn); 3630 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3631 if (ret < 0) 3632 goto err; 3633 break; 3634 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3635 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3636 if (ret < 0) 3637 goto err; 3638 break; 3639 default: 3640 pr_err("Unknown Opcode: 0x%02x ITT:" 3641 " 0x%08x, i_state: %d on CID: %hu\n", 3642 cmd->iscsi_opcode, cmd->init_task_tag, state, 3643 conn->cid); 3644 goto err; 3645 } 3646 3647 return 0; 3648 3649err: 3650 return -1; 3651} 3652EXPORT_SYMBOL(iscsit_immediate_queue); 3653 3654static int 3655iscsit_handle_immediate_queue(struct iscsi_conn *conn) 3656{ 3657 struct iscsit_transport *t = conn->conn_transport; 3658 struct iscsi_queue_req *qr; 3659 struct iscsi_cmd *cmd; 3660 u8 state; 3661 int ret; 3662 3663 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3664 atomic_set(&conn->check_immediate_queue, 0); 3665 cmd = qr->cmd; 3666 state = qr->state; 3667 kmem_cache_free(lio_qr_cache, qr); 3668 3669 ret = t->iscsit_immediate_queue(conn, cmd, state); 3670 if (ret < 0) 3671 return ret; 3672 } 3673 3674 return 0; 3675} 3676 3677int 3678iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state) 3679{ 3680 int ret; 3681 3682check_rsp_state: 3683 switch (state) { 3684 case ISTATE_SEND_DATAIN: 3685 ret = iscsit_send_datain(cmd, conn); 3686 if (ret < 0) 3687 goto err; 3688 else if (!ret) 3689 /* more drs */ 3690 goto check_rsp_state; 3691 else if (ret == 1) { 3692 /* all done */ 3693 spin_lock_bh(&cmd->istate_lock); 3694 cmd->i_state = ISTATE_SENT_STATUS; 3695 spin_unlock_bh(&cmd->istate_lock); 3696 3697 if (atomic_read(&conn->check_immediate_queue)) 3698 return 1; 3699 3700 return 0; 3701 } else if (ret == 2) { 3702 /* Still must send status, 3703 SCF_TRANSPORT_TASK_SENSE was set */ 3704 spin_lock_bh(&cmd->istate_lock); 3705 cmd->i_state = ISTATE_SEND_STATUS; 3706 spin_unlock_bh(&cmd->istate_lock); 3707 state = ISTATE_SEND_STATUS; 3708 goto check_rsp_state; 3709 } 3710 3711 break; 3712 case ISTATE_SEND_STATUS: 3713 case ISTATE_SEND_STATUS_RECOVERY: 3714 ret = iscsit_send_response(cmd, conn); 3715 break; 3716 case ISTATE_SEND_LOGOUTRSP: 3717 ret = iscsit_send_logout(cmd, conn); 3718 break; 3719 case ISTATE_SEND_ASYNCMSG: 3720 ret = iscsit_send_conn_drop_async_message( 3721 cmd, conn); 3722 break; 3723 case ISTATE_SEND_NOPIN: 3724 ret = iscsit_send_nopin(cmd, conn); 3725 break; 3726 case ISTATE_SEND_REJECT: 3727 ret = iscsit_send_reject(cmd, conn); 3728 break; 3729 case ISTATE_SEND_TASKMGTRSP: 3730 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3731 if (ret != 0) 3732 break; 3733 ret = iscsit_tmr_post_handler(cmd, conn); 3734 if (ret != 0) 3735 iscsit_fall_back_to_erl0(conn->sess); 3736 break; 3737 case ISTATE_SEND_TEXTRSP: 3738 ret = iscsit_send_text_rsp(cmd, conn); 3739 break; 3740 default: 3741 pr_err("Unknown Opcode: 0x%02x ITT:" 3742 " 0x%08x, i_state: %d on CID: %hu\n", 3743 cmd->iscsi_opcode, cmd->init_task_tag, 3744 state, conn->cid); 3745 goto err; 3746 } 3747 if (ret < 0) 3748 goto err; 3749 3750 switch (state) { 3751 case ISTATE_SEND_LOGOUTRSP: 3752 if (!iscsit_logout_post_handler(cmd, conn)) 3753 return -ECONNRESET; 3754 fallthrough; 3755 case ISTATE_SEND_STATUS: 3756 case ISTATE_SEND_ASYNCMSG: 3757 case ISTATE_SEND_NOPIN: 3758 case ISTATE_SEND_STATUS_RECOVERY: 3759 case ISTATE_SEND_TEXTRSP: 3760 case ISTATE_SEND_TASKMGTRSP: 3761 case ISTATE_SEND_REJECT: 3762 spin_lock_bh(&cmd->istate_lock); 3763 cmd->i_state = ISTATE_SENT_STATUS; 3764 spin_unlock_bh(&cmd->istate_lock); 3765 break; 3766 default: 3767 pr_err("Unknown Opcode: 0x%02x ITT:" 3768 " 0x%08x, i_state: %d on CID: %hu\n", 3769 cmd->iscsi_opcode, cmd->init_task_tag, 3770 cmd->i_state, conn->cid); 3771 goto err; 3772 } 3773 3774 if (atomic_read(&conn->check_immediate_queue)) 3775 return 1; 3776 3777 return 0; 3778 3779err: 3780 return -1; 3781} 3782EXPORT_SYMBOL(iscsit_response_queue); 3783 3784static int iscsit_handle_response_queue(struct iscsi_conn *conn) 3785{ 3786 struct iscsit_transport *t = conn->conn_transport; 3787 struct iscsi_queue_req *qr; 3788 struct iscsi_cmd *cmd; 3789 u8 state; 3790 int ret; 3791 3792 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3793 cmd = qr->cmd; 3794 state = qr->state; 3795 kmem_cache_free(lio_qr_cache, qr); 3796 3797 ret = t->iscsit_response_queue(conn, cmd, state); 3798 if (ret == 1 || ret < 0) 3799 return ret; 3800 } 3801 3802 return 0; 3803} 3804 3805int iscsi_target_tx_thread(void *arg) 3806{ 3807 int ret = 0; 3808 struct iscsi_conn *conn = arg; 3809 bool conn_freed = false; 3810 3811 /* 3812 * Allow ourselves to be interrupted by SIGINT so that a 3813 * connection recovery / failure event can be triggered externally. 3814 */ 3815 allow_signal(SIGINT); 3816 3817 while (!kthread_should_stop()) { 3818 /* 3819 * Ensure that both TX and RX per connection kthreads 3820 * are scheduled to run on the same CPU. 3821 */ 3822 iscsit_thread_check_cpumask(conn, current, 1); 3823 3824 wait_event_interruptible(conn->queues_wq, 3825 !iscsit_conn_all_queues_empty(conn)); 3826 3827 if (signal_pending(current)) 3828 goto transport_err; 3829 3830get_immediate: 3831 ret = iscsit_handle_immediate_queue(conn); 3832 if (ret < 0) 3833 goto transport_err; 3834 3835 ret = iscsit_handle_response_queue(conn); 3836 if (ret == 1) { 3837 goto get_immediate; 3838 } else if (ret == -ECONNRESET) { 3839 conn_freed = true; 3840 goto out; 3841 } else if (ret < 0) { 3842 goto transport_err; 3843 } 3844 } 3845 3846transport_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, &conn_freed); 3854out: 3855 if (!conn_freed) { 3856 while (!kthread_should_stop()) { 3857 msleep(100); 3858 } 3859 } 3860 return 0; 3861} 3862 3863static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) 3864{ 3865 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3866 struct iscsi_cmd *cmd; 3867 int ret = 0; 3868 3869 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3870 case ISCSI_OP_SCSI_CMD: 3871 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3872 if (!cmd) 3873 goto reject; 3874 3875 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3876 break; 3877 case ISCSI_OP_SCSI_DATA_OUT: 3878 ret = iscsit_handle_data_out(conn, buf); 3879 break; 3880 case ISCSI_OP_NOOP_OUT: 3881 cmd = NULL; 3882 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3883 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3884 if (!cmd) 3885 goto reject; 3886 } 3887 ret = iscsit_handle_nop_out(conn, cmd, buf); 3888 break; 3889 case ISCSI_OP_SCSI_TMFUNC: 3890 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3891 if (!cmd) 3892 goto reject; 3893 3894 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 3895 break; 3896 case ISCSI_OP_TEXT: 3897 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 3898 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 3899 if (!cmd) 3900 goto reject; 3901 } else { 3902 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3903 if (!cmd) 3904 goto reject; 3905 } 3906 3907 ret = iscsit_handle_text_cmd(conn, cmd, buf); 3908 break; 3909 case ISCSI_OP_LOGOUT: 3910 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3911 if (!cmd) 3912 goto reject; 3913 3914 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 3915 if (ret > 0) 3916 wait_for_completion_timeout(&conn->conn_logout_comp, 3917 SECONDS_FOR_LOGOUT_COMP * HZ); 3918 break; 3919 case ISCSI_OP_SNACK: 3920 ret = iscsit_handle_snack(conn, buf); 3921 break; 3922 default: 3923 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 3924 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 3925 pr_err("Cannot recover from unknown" 3926 " opcode while ERL=0, closing iSCSI connection.\n"); 3927 return -1; 3928 } 3929 pr_err("Unable to recover from unknown opcode while OFMarker=No," 3930 " closing iSCSI connection.\n"); 3931 ret = -1; 3932 break; 3933 } 3934 3935 return ret; 3936reject: 3937 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 3938} 3939 3940static bool iscsi_target_check_conn_state(struct iscsi_conn *conn) 3941{ 3942 bool ret; 3943 3944 spin_lock_bh(&conn->state_lock); 3945 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 3946 spin_unlock_bh(&conn->state_lock); 3947 3948 return ret; 3949} 3950 3951static void iscsit_get_rx_pdu(struct iscsi_conn *conn) 3952{ 3953 int ret; 3954 u8 *buffer, opcode; 3955 u32 checksum = 0, digest = 0; 3956 struct kvec iov; 3957 3958 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 3959 if (!buffer) 3960 return; 3961 3962 while (!kthread_should_stop()) { 3963 /* 3964 * Ensure that both TX and RX per connection kthreads 3965 * are scheduled to run on the same CPU. 3966 */ 3967 iscsit_thread_check_cpumask(conn, current, 0); 3968 3969 memset(&iov, 0, sizeof(struct kvec)); 3970 3971 iov.iov_base = buffer; 3972 iov.iov_len = ISCSI_HDR_LEN; 3973 3974 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 3975 if (ret != ISCSI_HDR_LEN) { 3976 iscsit_rx_thread_wait_for_tcp(conn); 3977 break; 3978 } 3979 3980 if (conn->conn_ops->HeaderDigest) { 3981 iov.iov_base = &digest; 3982 iov.iov_len = ISCSI_CRC_LEN; 3983 3984 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 3985 if (ret != ISCSI_CRC_LEN) { 3986 iscsit_rx_thread_wait_for_tcp(conn); 3987 break; 3988 } 3989 3990 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 3991 ISCSI_HDR_LEN, 0, NULL, 3992 &checksum); 3993 3994 if (digest != checksum) { 3995 pr_err("HeaderDigest CRC32C failed," 3996 " received 0x%08x, computed 0x%08x\n", 3997 digest, checksum); 3998 /* 3999 * Set the PDU to 0xff so it will intentionally 4000 * hit default in the switch below. 4001 */ 4002 memset(buffer, 0xff, ISCSI_HDR_LEN); 4003 atomic_long_inc(&conn->sess->conn_digest_errors); 4004 } else { 4005 pr_debug("Got HeaderDigest CRC32C" 4006 " 0x%08x\n", checksum); 4007 } 4008 } 4009 4010 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4011 break; 4012 4013 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4014 4015 if (conn->sess->sess_ops->SessionType && 4016 ((!(opcode & ISCSI_OP_TEXT)) || 4017 (!(opcode & ISCSI_OP_LOGOUT)))) { 4018 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4019 " while in Discovery Session, rejecting.\n", opcode); 4020 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4021 buffer); 4022 break; 4023 } 4024 4025 ret = iscsi_target_rx_opcode(conn, buffer); 4026 if (ret < 0) 4027 break; 4028 } 4029 4030 kfree(buffer); 4031} 4032 4033int iscsi_target_rx_thread(void *arg) 4034{ 4035 int rc; 4036 struct iscsi_conn *conn = arg; 4037 bool conn_freed = false; 4038 4039 /* 4040 * Allow ourselves to be interrupted by SIGINT so that a 4041 * connection recovery / failure event can be triggered externally. 4042 */ 4043 allow_signal(SIGINT); 4044 /* 4045 * Wait for iscsi_post_login_handler() to complete before allowing 4046 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4047 */ 4048 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4049 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4050 goto out; 4051 4052 if (!conn->conn_transport->iscsit_get_rx_pdu) 4053 return 0; 4054 4055 conn->conn_transport->iscsit_get_rx_pdu(conn); 4056 4057 if (!signal_pending(current)) 4058 atomic_set(&conn->transport_failed, 1); 4059 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4060 4061out: 4062 if (!conn_freed) { 4063 while (!kthread_should_stop()) { 4064 msleep(100); 4065 } 4066 } 4067 4068 return 0; 4069} 4070 4071static void iscsit_release_commands_from_conn(struct iscsi_conn *conn) 4072{ 4073 LIST_HEAD(tmp_list); 4074 struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL; 4075 struct iscsi_session *sess = conn->sess; 4076 /* 4077 * We expect this function to only ever be called from either RX or TX 4078 * thread context via iscsit_close_connection() once the other context 4079 * has been reset -> returned sleeping pre-handler state. 4080 */ 4081 spin_lock_bh(&conn->cmd_lock); 4082 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4083 4084 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4085 struct se_cmd *se_cmd = &cmd->se_cmd; 4086 4087 if (!se_cmd->se_tfo) 4088 continue; 4089 4090 spin_lock_irq(&se_cmd->t_state_lock); 4091 if (se_cmd->transport_state & CMD_T_ABORTED) { 4092 if (!(se_cmd->transport_state & CMD_T_TAS)) 4093 /* 4094 * LIO's abort path owns the cleanup for this, 4095 * so put it back on the list and let 4096 * aborted_task handle it. 4097 */ 4098 list_move_tail(&cmd->i_conn_node, 4099 &conn->conn_cmd_list); 4100 } else { 4101 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4102 } 4103 spin_unlock_irq(&se_cmd->t_state_lock); 4104 } 4105 spin_unlock_bh(&conn->cmd_lock); 4106 4107 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4108 list_del_init(&cmd->i_conn_node); 4109 4110 iscsit_increment_maxcmdsn(cmd, sess); 4111 iscsit_free_cmd(cmd, true); 4112 4113 } 4114} 4115 4116static void iscsit_stop_timers_for_cmds( 4117 struct iscsi_conn *conn) 4118{ 4119 struct iscsi_cmd *cmd; 4120 4121 spin_lock_bh(&conn->cmd_lock); 4122 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4123 if (cmd->data_direction == DMA_TO_DEVICE) 4124 iscsit_stop_dataout_timer(cmd); 4125 } 4126 spin_unlock_bh(&conn->cmd_lock); 4127} 4128 4129int iscsit_close_connection( 4130 struct iscsi_conn *conn) 4131{ 4132 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4133 struct iscsi_session *sess = conn->sess; 4134 4135 pr_debug("Closing iSCSI connection CID %hu on SID:" 4136 " %u\n", conn->cid, sess->sid); 4137 /* 4138 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4139 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4140 * sleeping and the logout response never got sent because the 4141 * connection failed. 4142 * 4143 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4144 * to signal logout response TX interrupt completion. Go ahead and skip 4145 * this for iser since isert_rx_opcode() does not wait on logout failure, 4146 * and to avoid iscsi_conn pointer dereference in iser-target code. 4147 */ 4148 if (!conn->conn_transport->rdma_shutdown) 4149 complete(&conn->conn_logout_comp); 4150 4151 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4152 if (conn->tx_thread && 4153 cmpxchg(&conn->tx_thread_active, true, false)) { 4154 send_sig(SIGINT, conn->tx_thread, 1); 4155 kthread_stop(conn->tx_thread); 4156 } 4157 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4158 if (conn->rx_thread && 4159 cmpxchg(&conn->rx_thread_active, true, false)) { 4160 send_sig(SIGINT, conn->rx_thread, 1); 4161 kthread_stop(conn->rx_thread); 4162 } 4163 } 4164 4165 spin_lock(&iscsit_global->ts_bitmap_lock); 4166 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4167 get_order(1)); 4168 spin_unlock(&iscsit_global->ts_bitmap_lock); 4169 4170 iscsit_stop_timers_for_cmds(conn); 4171 iscsit_stop_nopin_response_timer(conn); 4172 iscsit_stop_nopin_timer(conn); 4173 4174 if (conn->conn_transport->iscsit_wait_conn) 4175 conn->conn_transport->iscsit_wait_conn(conn); 4176 4177 /* 4178 * During Connection recovery drop unacknowledged out of order 4179 * commands for this connection, and prepare the other commands 4180 * for reallegiance. 4181 * 4182 * During normal operation clear the out of order commands (but 4183 * do not free the struct iscsi_ooo_cmdsn's) and release all 4184 * struct iscsi_cmds. 4185 */ 4186 if (atomic_read(&conn->connection_recovery)) { 4187 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4188 iscsit_prepare_cmds_for_reallegiance(conn); 4189 } else { 4190 iscsit_clear_ooo_cmdsns_for_conn(conn); 4191 iscsit_release_commands_from_conn(conn); 4192 } 4193 iscsit_free_queue_reqs_for_conn(conn); 4194 4195 /* 4196 * Handle decrementing session or connection usage count if 4197 * a logout response was not able to be sent because the 4198 * connection failed. Fall back to Session Recovery here. 4199 */ 4200 if (atomic_read(&conn->conn_logout_remove)) { 4201 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4202 iscsit_dec_conn_usage_count(conn); 4203 iscsit_dec_session_usage_count(sess); 4204 } 4205 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4206 iscsit_dec_conn_usage_count(conn); 4207 4208 atomic_set(&conn->conn_logout_remove, 0); 4209 atomic_set(&sess->session_reinstatement, 0); 4210 atomic_set(&sess->session_fall_back_to_erl0, 1); 4211 } 4212 4213 spin_lock_bh(&sess->conn_lock); 4214 list_del(&conn->conn_list); 4215 4216 /* 4217 * Attempt to let the Initiator know this connection failed by 4218 * sending an Connection Dropped Async Message on another 4219 * active connection. 4220 */ 4221 if (atomic_read(&conn->connection_recovery)) 4222 iscsit_build_conn_drop_async_message(conn); 4223 4224 spin_unlock_bh(&sess->conn_lock); 4225 4226 /* 4227 * If connection reinstatement is being performed on this connection, 4228 * up the connection reinstatement semaphore that is being blocked on 4229 * in iscsit_cause_connection_reinstatement(). 4230 */ 4231 spin_lock_bh(&conn->state_lock); 4232 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4233 spin_unlock_bh(&conn->state_lock); 4234 complete(&conn->conn_wait_comp); 4235 wait_for_completion(&conn->conn_post_wait_comp); 4236 spin_lock_bh(&conn->state_lock); 4237 } 4238 4239 /* 4240 * If connection reinstatement is being performed on this connection 4241 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4242 * connection wait rcfr semaphore that is being blocked on 4243 * an iscsit_connection_reinstatement_rcfr(). 4244 */ 4245 if (atomic_read(&conn->connection_wait_rcfr)) { 4246 spin_unlock_bh(&conn->state_lock); 4247 complete(&conn->conn_wait_rcfr_comp); 4248 wait_for_completion(&conn->conn_post_wait_comp); 4249 spin_lock_bh(&conn->state_lock); 4250 } 4251 atomic_set(&conn->connection_reinstatement, 1); 4252 spin_unlock_bh(&conn->state_lock); 4253 4254 /* 4255 * If any other processes are accessing this connection pointer we 4256 * must wait until they have completed. 4257 */ 4258 iscsit_check_conn_usage_count(conn); 4259 4260 ahash_request_free(conn->conn_tx_hash); 4261 if (conn->conn_rx_hash) { 4262 struct crypto_ahash *tfm; 4263 4264 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4265 ahash_request_free(conn->conn_rx_hash); 4266 crypto_free_ahash(tfm); 4267 } 4268 4269 if (conn->sock) 4270 sock_release(conn->sock); 4271 4272 if (conn->conn_transport->iscsit_free_conn) 4273 conn->conn_transport->iscsit_free_conn(conn); 4274 4275 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4276 conn->conn_state = TARG_CONN_STATE_FREE; 4277 iscsit_free_conn(conn); 4278 4279 spin_lock_bh(&sess->conn_lock); 4280 atomic_dec(&sess->nconn); 4281 pr_debug("Decremented iSCSI connection count to %hu from node:" 4282 " %s\n", atomic_read(&sess->nconn), 4283 sess->sess_ops->InitiatorName); 4284 /* 4285 * Make sure that if one connection fails in an non ERL=2 iSCSI 4286 * Session that they all fail. 4287 */ 4288 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4289 !atomic_read(&sess->session_logout)) 4290 atomic_set(&sess->session_fall_back_to_erl0, 1); 4291 4292 /* 4293 * If this was not the last connection in the session, and we are 4294 * performing session reinstatement or falling back to ERL=0, call 4295 * iscsit_stop_session() without sleeping to shutdown the other 4296 * active connections. 4297 */ 4298 if (atomic_read(&sess->nconn)) { 4299 if (!atomic_read(&sess->session_reinstatement) && 4300 !atomic_read(&sess->session_fall_back_to_erl0)) { 4301 spin_unlock_bh(&sess->conn_lock); 4302 return 0; 4303 } 4304 if (!atomic_read(&sess->session_stop_active)) { 4305 atomic_set(&sess->session_stop_active, 1); 4306 spin_unlock_bh(&sess->conn_lock); 4307 iscsit_stop_session(sess, 0, 0); 4308 return 0; 4309 } 4310 spin_unlock_bh(&sess->conn_lock); 4311 return 0; 4312 } 4313 4314 /* 4315 * If this was the last connection in the session and one of the 4316 * following is occurring: 4317 * 4318 * Session Reinstatement is not being performed, and are falling back 4319 * to ERL=0 call iscsit_close_session(). 4320 * 4321 * Session Logout was requested. iscsit_close_session() will be called 4322 * elsewhere. 4323 * 4324 * Session Continuation is not being performed, start the Time2Retain 4325 * handler and check if sleep_on_sess_wait_sem is active. 4326 */ 4327 if (!atomic_read(&sess->session_reinstatement) && 4328 atomic_read(&sess->session_fall_back_to_erl0)) { 4329 spin_unlock_bh(&sess->conn_lock); 4330 complete_all(&sess->session_wait_comp); 4331 iscsit_close_session(sess); 4332 4333 return 0; 4334 } else if (atomic_read(&sess->session_logout)) { 4335 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4336 sess->session_state = TARG_SESS_STATE_FREE; 4337 4338 if (atomic_read(&sess->session_close)) { 4339 spin_unlock_bh(&sess->conn_lock); 4340 complete_all(&sess->session_wait_comp); 4341 iscsit_close_session(sess); 4342 } else { 4343 spin_unlock_bh(&sess->conn_lock); 4344 } 4345 4346 return 0; 4347 } else { 4348 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4349 sess->session_state = TARG_SESS_STATE_FAILED; 4350 4351 if (!atomic_read(&sess->session_continuation)) 4352 iscsit_start_time2retain_handler(sess); 4353 4354 if (atomic_read(&sess->session_close)) { 4355 spin_unlock_bh(&sess->conn_lock); 4356 complete_all(&sess->session_wait_comp); 4357 iscsit_close_session(sess); 4358 } else { 4359 spin_unlock_bh(&sess->conn_lock); 4360 } 4361 4362 return 0; 4363 } 4364} 4365 4366/* 4367 * If the iSCSI Session for the iSCSI Initiator Node exists, 4368 * forcefully shutdown the iSCSI NEXUS. 4369 */ 4370int iscsit_close_session(struct iscsi_session *sess) 4371{ 4372 struct iscsi_portal_group *tpg = sess->tpg; 4373 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4374 4375 if (atomic_read(&sess->nconn)) { 4376 pr_err("%d connection(s) still exist for iSCSI session" 4377 " to %s\n", atomic_read(&sess->nconn), 4378 sess->sess_ops->InitiatorName); 4379 BUG(); 4380 } 4381 4382 spin_lock_bh(&se_tpg->session_lock); 4383 atomic_set(&sess->session_logout, 1); 4384 atomic_set(&sess->session_reinstatement, 1); 4385 iscsit_stop_time2retain_timer(sess); 4386 spin_unlock_bh(&se_tpg->session_lock); 4387 4388 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4389 iscsit_free_connection_recovery_entries(sess); 4390 4391 /* 4392 * transport_deregister_session_configfs() will clear the 4393 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4394 * can be setting it again with __transport_register_session() in 4395 * iscsi_post_login_handler() again after the iscsit_stop_session() 4396 * completes in iscsi_np context. 4397 */ 4398 transport_deregister_session_configfs(sess->se_sess); 4399 4400 /* 4401 * If any other processes are accessing this session pointer we must 4402 * wait until they have completed. If we are in an interrupt (the 4403 * time2retain handler) and contain and active session usage count we 4404 * restart the timer and exit. 4405 */ 4406 if (!in_interrupt()) { 4407 iscsit_check_session_usage_count(sess); 4408 } else { 4409 if (iscsit_check_session_usage_count(sess) == 2) { 4410 atomic_set(&sess->session_logout, 0); 4411 iscsit_start_time2retain_handler(sess); 4412 return 0; 4413 } 4414 } 4415 4416 transport_deregister_session(sess->se_sess); 4417 4418 iscsit_free_all_ooo_cmdsns(sess); 4419 4420 spin_lock_bh(&se_tpg->session_lock); 4421 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4422 sess->session_state = TARG_SESS_STATE_FREE; 4423 pr_debug("Released iSCSI session from node: %s\n", 4424 sess->sess_ops->InitiatorName); 4425 tpg->nsessions--; 4426 if (tpg->tpg_tiqn) 4427 tpg->tpg_tiqn->tiqn_nsessions--; 4428 4429 pr_debug("Decremented number of active iSCSI Sessions on" 4430 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4431 4432 ida_free(&sess_ida, sess->session_index); 4433 kfree(sess->sess_ops); 4434 sess->sess_ops = NULL; 4435 spin_unlock_bh(&se_tpg->session_lock); 4436 4437 kfree(sess); 4438 return 0; 4439} 4440 4441static void iscsit_logout_post_handler_closesession( 4442 struct iscsi_conn *conn) 4443{ 4444 struct iscsi_session *sess = conn->sess; 4445 int sleep = 1; 4446 /* 4447 * Traditional iscsi/tcp will invoke this logic from TX thread 4448 * context during session logout, so clear tx_thread_active and 4449 * sleep if iscsit_close_connection() has not already occured. 4450 * 4451 * Since iser-target invokes this logic from it's own workqueue, 4452 * always sleep waiting for RX/TX thread shutdown to complete 4453 * within iscsit_close_connection(). 4454 */ 4455 if (!conn->conn_transport->rdma_shutdown) { 4456 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4457 if (!sleep) 4458 return; 4459 } 4460 4461 atomic_set(&conn->conn_logout_remove, 0); 4462 complete(&conn->conn_logout_comp); 4463 4464 iscsit_dec_conn_usage_count(conn); 4465 atomic_set(&sess->session_close, 1); 4466 iscsit_stop_session(sess, sleep, sleep); 4467 iscsit_dec_session_usage_count(sess); 4468} 4469 4470static void iscsit_logout_post_handler_samecid( 4471 struct iscsi_conn *conn) 4472{ 4473 int sleep = 1; 4474 4475 if (!conn->conn_transport->rdma_shutdown) { 4476 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4477 if (!sleep) 4478 return; 4479 } 4480 4481 atomic_set(&conn->conn_logout_remove, 0); 4482 complete(&conn->conn_logout_comp); 4483 4484 iscsit_cause_connection_reinstatement(conn, sleep); 4485 iscsit_dec_conn_usage_count(conn); 4486} 4487 4488static void iscsit_logout_post_handler_diffcid( 4489 struct iscsi_conn *conn, 4490 u16 cid) 4491{ 4492 struct iscsi_conn *l_conn; 4493 struct iscsi_session *sess = conn->sess; 4494 bool conn_found = false; 4495 4496 if (!sess) 4497 return; 4498 4499 spin_lock_bh(&sess->conn_lock); 4500 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4501 if (l_conn->cid == cid) { 4502 iscsit_inc_conn_usage_count(l_conn); 4503 conn_found = true; 4504 break; 4505 } 4506 } 4507 spin_unlock_bh(&sess->conn_lock); 4508 4509 if (!conn_found) 4510 return; 4511 4512 if (l_conn->sock) 4513 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4514 4515 spin_lock_bh(&l_conn->state_lock); 4516 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4517 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4518 spin_unlock_bh(&l_conn->state_lock); 4519 4520 iscsit_cause_connection_reinstatement(l_conn, 1); 4521 iscsit_dec_conn_usage_count(l_conn); 4522} 4523 4524/* 4525 * Return of 0 causes the TX thread to restart. 4526 */ 4527int iscsit_logout_post_handler( 4528 struct iscsi_cmd *cmd, 4529 struct iscsi_conn *conn) 4530{ 4531 int ret = 0; 4532 4533 switch (cmd->logout_reason) { 4534 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4535 switch (cmd->logout_response) { 4536 case ISCSI_LOGOUT_SUCCESS: 4537 case ISCSI_LOGOUT_CLEANUP_FAILED: 4538 default: 4539 iscsit_logout_post_handler_closesession(conn); 4540 break; 4541 } 4542 break; 4543 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4544 if (conn->cid == cmd->logout_cid) { 4545 switch (cmd->logout_response) { 4546 case ISCSI_LOGOUT_SUCCESS: 4547 case ISCSI_LOGOUT_CLEANUP_FAILED: 4548 default: 4549 iscsit_logout_post_handler_samecid(conn); 4550 break; 4551 } 4552 } else { 4553 switch (cmd->logout_response) { 4554 case ISCSI_LOGOUT_SUCCESS: 4555 iscsit_logout_post_handler_diffcid(conn, 4556 cmd->logout_cid); 4557 break; 4558 case ISCSI_LOGOUT_CID_NOT_FOUND: 4559 case ISCSI_LOGOUT_CLEANUP_FAILED: 4560 default: 4561 break; 4562 } 4563 ret = 1; 4564 } 4565 break; 4566 case ISCSI_LOGOUT_REASON_RECOVERY: 4567 switch (cmd->logout_response) { 4568 case ISCSI_LOGOUT_SUCCESS: 4569 case ISCSI_LOGOUT_CID_NOT_FOUND: 4570 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4571 case ISCSI_LOGOUT_CLEANUP_FAILED: 4572 default: 4573 break; 4574 } 4575 ret = 1; 4576 break; 4577 default: 4578 break; 4579 4580 } 4581 return ret; 4582} 4583EXPORT_SYMBOL(iscsit_logout_post_handler); 4584 4585void iscsit_fail_session(struct iscsi_session *sess) 4586{ 4587 struct iscsi_conn *conn; 4588 4589 spin_lock_bh(&sess->conn_lock); 4590 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4591 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4592 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4593 } 4594 spin_unlock_bh(&sess->conn_lock); 4595 4596 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4597 sess->session_state = TARG_SESS_STATE_FAILED; 4598} 4599 4600void iscsit_stop_session( 4601 struct iscsi_session *sess, 4602 int session_sleep, 4603 int connection_sleep) 4604{ 4605 u16 conn_count = atomic_read(&sess->nconn); 4606 struct iscsi_conn *conn, *conn_tmp = NULL; 4607 int is_last; 4608 4609 spin_lock_bh(&sess->conn_lock); 4610 4611 if (connection_sleep) { 4612 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4613 conn_list) { 4614 if (conn_count == 0) 4615 break; 4616 4617 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4618 is_last = 1; 4619 } else { 4620 iscsit_inc_conn_usage_count(conn_tmp); 4621 is_last = 0; 4622 } 4623 iscsit_inc_conn_usage_count(conn); 4624 4625 spin_unlock_bh(&sess->conn_lock); 4626 iscsit_cause_connection_reinstatement(conn, 1); 4627 spin_lock_bh(&sess->conn_lock); 4628 4629 iscsit_dec_conn_usage_count(conn); 4630 if (is_last == 0) 4631 iscsit_dec_conn_usage_count(conn_tmp); 4632 conn_count--; 4633 } 4634 } else { 4635 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4636 iscsit_cause_connection_reinstatement(conn, 0); 4637 } 4638 4639 if (session_sleep && atomic_read(&sess->nconn)) { 4640 spin_unlock_bh(&sess->conn_lock); 4641 wait_for_completion(&sess->session_wait_comp); 4642 } else 4643 spin_unlock_bh(&sess->conn_lock); 4644} 4645 4646int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4647{ 4648 struct iscsi_session *sess; 4649 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4650 struct se_session *se_sess, *se_sess_tmp; 4651 LIST_HEAD(free_list); 4652 int session_count = 0; 4653 4654 spin_lock_bh(&se_tpg->session_lock); 4655 if (tpg->nsessions && !force) { 4656 spin_unlock_bh(&se_tpg->session_lock); 4657 return -1; 4658 } 4659 4660 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4661 sess_list) { 4662 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4663 4664 spin_lock(&sess->conn_lock); 4665 if (atomic_read(&sess->session_fall_back_to_erl0) || 4666 atomic_read(&sess->session_logout) || 4667 atomic_read(&sess->session_close) || 4668 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4669 spin_unlock(&sess->conn_lock); 4670 continue; 4671 } 4672 iscsit_inc_session_usage_count(sess); 4673 atomic_set(&sess->session_reinstatement, 1); 4674 atomic_set(&sess->session_fall_back_to_erl0, 1); 4675 atomic_set(&sess->session_close, 1); 4676 spin_unlock(&sess->conn_lock); 4677 4678 list_move_tail(&se_sess->sess_list, &free_list); 4679 } 4680 spin_unlock_bh(&se_tpg->session_lock); 4681 4682 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4683 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr; 4684 4685 list_del_init(&se_sess->sess_list); 4686 iscsit_stop_session(sess, 1, 1); 4687 iscsit_dec_session_usage_count(sess); 4688 session_count++; 4689 } 4690 4691 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4692 " Group: %hu\n", session_count, tpg->tpgt); 4693 return 0; 4694} 4695 4696MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4697MODULE_VERSION("4.1.x"); 4698MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4699MODULE_LICENSE("GPL"); 4700 4701module_init(iscsi_target_init_module); 4702module_exit(iscsi_target_cleanup_module); 4703