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 <linux/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/target_core_backend.h> 30 #include <target/iscsi/iscsi_target_core.h> 31 #include "iscsi_target_parameters.h" 32 #include "iscsi_target_seq_pdu_list.h" 33 #include "iscsi_target_datain_values.h" 34 #include "iscsi_target_erl0.h" 35 #include "iscsi_target_erl1.h" 36 #include "iscsi_target_erl2.h" 37 #include "iscsi_target_login.h" 38 #include "iscsi_target_tmr.h" 39 #include "iscsi_target_tpg.h" 40 #include "iscsi_target_util.h" 41 #include "iscsi_target.h" 42 #include "iscsi_target_device.h" 43 #include <target/iscsi/iscsi_target_stat.h> 44 45 #include <target/iscsi/iscsi_transport.h> 46 47 static LIST_HEAD(g_tiqn_list); 48 static LIST_HEAD(g_np_list); 49 static DEFINE_SPINLOCK(tiqn_lock); 50 static DEFINE_MUTEX(np_lock); 51 52 static struct idr tiqn_idr; 53 DEFINE_IDA(sess_ida); 54 struct mutex auth_id_lock; 55 56 struct iscsit_global *iscsit_global; 57 58 struct kmem_cache *lio_qr_cache; 59 struct kmem_cache *lio_dr_cache; 60 struct kmem_cache *lio_ooo_cache; 61 struct kmem_cache *lio_r2t_cache; 62 63 static int iscsit_handle_immediate_data(struct iscsit_cmd *, 64 struct iscsi_scsi_req *, u32); 65 iscsit_get_tiqn_for_login(unsigned char * buf)66 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf) 67 { 68 struct iscsi_tiqn *tiqn = NULL; 69 70 spin_lock(&tiqn_lock); 71 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 72 if (!strcmp(tiqn->tiqn, buf)) { 73 74 spin_lock(&tiqn->tiqn_state_lock); 75 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 76 tiqn->tiqn_access_count++; 77 spin_unlock(&tiqn->tiqn_state_lock); 78 spin_unlock(&tiqn_lock); 79 return tiqn; 80 } 81 spin_unlock(&tiqn->tiqn_state_lock); 82 } 83 } 84 spin_unlock(&tiqn_lock); 85 86 return NULL; 87 } 88 iscsit_set_tiqn_shutdown(struct iscsi_tiqn * tiqn)89 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn) 90 { 91 spin_lock(&tiqn->tiqn_state_lock); 92 if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) { 93 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN; 94 spin_unlock(&tiqn->tiqn_state_lock); 95 return 0; 96 } 97 spin_unlock(&tiqn->tiqn_state_lock); 98 99 return -1; 100 } 101 iscsit_put_tiqn_for_login(struct iscsi_tiqn * tiqn)102 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn) 103 { 104 spin_lock(&tiqn->tiqn_state_lock); 105 tiqn->tiqn_access_count--; 106 spin_unlock(&tiqn->tiqn_state_lock); 107 } 108 109 /* 110 * Note that IQN formatting is expected to be done in userspace, and 111 * no explict IQN format checks are done here. 112 */ iscsit_add_tiqn(unsigned char * buf)113 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf) 114 { 115 struct iscsi_tiqn *tiqn = NULL; 116 int ret; 117 118 if (strlen(buf) >= ISCSI_IQN_LEN) { 119 pr_err("Target IQN exceeds %d bytes\n", 120 ISCSI_IQN_LEN); 121 return ERR_PTR(-EINVAL); 122 } 123 124 tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL); 125 if (!tiqn) 126 return ERR_PTR(-ENOMEM); 127 128 sprintf(tiqn->tiqn, "%s", buf); 129 INIT_LIST_HEAD(&tiqn->tiqn_list); 130 INIT_LIST_HEAD(&tiqn->tiqn_tpg_list); 131 spin_lock_init(&tiqn->tiqn_state_lock); 132 spin_lock_init(&tiqn->tiqn_tpg_lock); 133 spin_lock_init(&tiqn->sess_err_stats.lock); 134 spin_lock_init(&tiqn->login_stats.lock); 135 spin_lock_init(&tiqn->logout_stats.lock); 136 137 tiqn->tiqn_state = TIQN_STATE_ACTIVE; 138 139 idr_preload(GFP_KERNEL); 140 spin_lock(&tiqn_lock); 141 142 ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT); 143 if (ret < 0) { 144 pr_err("idr_alloc() failed for tiqn->tiqn_index\n"); 145 spin_unlock(&tiqn_lock); 146 idr_preload_end(); 147 kfree(tiqn); 148 return ERR_PTR(ret); 149 } 150 tiqn->tiqn_index = ret; 151 list_add_tail(&tiqn->tiqn_list, &g_tiqn_list); 152 153 spin_unlock(&tiqn_lock); 154 idr_preload_end(); 155 156 pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn); 157 158 return tiqn; 159 160 } 161 iscsit_wait_for_tiqn(struct iscsi_tiqn * tiqn)162 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn) 163 { 164 /* 165 * Wait for accesses to said struct iscsi_tiqn to end. 166 */ 167 spin_lock(&tiqn->tiqn_state_lock); 168 while (tiqn->tiqn_access_count != 0) { 169 spin_unlock(&tiqn->tiqn_state_lock); 170 msleep(10); 171 spin_lock(&tiqn->tiqn_state_lock); 172 } 173 spin_unlock(&tiqn->tiqn_state_lock); 174 } 175 iscsit_del_tiqn(struct iscsi_tiqn * tiqn)176 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn) 177 { 178 /* 179 * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN 180 * while holding tiqn->tiqn_state_lock. This means that all subsequent 181 * attempts to access this struct iscsi_tiqn will fail from both transport 182 * fabric and control code paths. 183 */ 184 if (iscsit_set_tiqn_shutdown(tiqn) < 0) { 185 pr_err("iscsit_set_tiqn_shutdown() failed\n"); 186 return; 187 } 188 189 iscsit_wait_for_tiqn(tiqn); 190 191 spin_lock(&tiqn_lock); 192 list_del(&tiqn->tiqn_list); 193 idr_remove(&tiqn_idr, tiqn->tiqn_index); 194 spin_unlock(&tiqn_lock); 195 196 pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n", 197 tiqn->tiqn); 198 kfree(tiqn); 199 } 200 iscsit_access_np(struct iscsi_np * np,struct iscsi_portal_group * tpg)201 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg) 202 { 203 int ret; 204 /* 205 * Determine if the network portal is accepting storage traffic. 206 */ 207 spin_lock_bh(&np->np_thread_lock); 208 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 209 spin_unlock_bh(&np->np_thread_lock); 210 return -1; 211 } 212 spin_unlock_bh(&np->np_thread_lock); 213 /* 214 * Determine if the portal group is accepting storage traffic. 215 */ 216 spin_lock_bh(&tpg->tpg_state_lock); 217 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 218 spin_unlock_bh(&tpg->tpg_state_lock); 219 return -1; 220 } 221 spin_unlock_bh(&tpg->tpg_state_lock); 222 223 /* 224 * Here we serialize access across the TIQN+TPG Tuple. 225 */ 226 ret = down_interruptible(&tpg->np_login_sem); 227 if (ret != 0) 228 return -1; 229 230 spin_lock_bh(&tpg->tpg_state_lock); 231 if (tpg->tpg_state != TPG_STATE_ACTIVE) { 232 spin_unlock_bh(&tpg->tpg_state_lock); 233 up(&tpg->np_login_sem); 234 return -1; 235 } 236 spin_unlock_bh(&tpg->tpg_state_lock); 237 238 return 0; 239 } 240 iscsit_login_kref_put(struct kref * kref)241 void iscsit_login_kref_put(struct kref *kref) 242 { 243 struct iscsi_tpg_np *tpg_np = container_of(kref, 244 struct iscsi_tpg_np, tpg_np_kref); 245 246 complete(&tpg_np->tpg_np_comp); 247 } 248 iscsit_deaccess_np(struct iscsi_np * np,struct iscsi_portal_group * tpg,struct iscsi_tpg_np * tpg_np)249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg, 250 struct iscsi_tpg_np *tpg_np) 251 { 252 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 253 254 up(&tpg->np_login_sem); 255 256 if (tpg_np) 257 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 258 259 if (tiqn) 260 iscsit_put_tiqn_for_login(tiqn); 261 262 return 0; 263 } 264 iscsit_check_np_match(struct sockaddr_storage * sockaddr,struct iscsi_np * np,int network_transport)265 bool iscsit_check_np_match( 266 struct sockaddr_storage *sockaddr, 267 struct iscsi_np *np, 268 int network_transport) 269 { 270 struct sockaddr_in *sock_in, *sock_in_e; 271 struct sockaddr_in6 *sock_in6, *sock_in6_e; 272 bool ip_match = false; 273 u16 port, port_e; 274 275 if (sockaddr->ss_family == AF_INET6) { 276 sock_in6 = (struct sockaddr_in6 *)sockaddr; 277 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr; 278 279 if (!memcmp(&sock_in6->sin6_addr.in6_u, 280 &sock_in6_e->sin6_addr.in6_u, 281 sizeof(struct in6_addr))) 282 ip_match = true; 283 284 port = ntohs(sock_in6->sin6_port); 285 port_e = ntohs(sock_in6_e->sin6_port); 286 } else { 287 sock_in = (struct sockaddr_in *)sockaddr; 288 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr; 289 290 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr) 291 ip_match = true; 292 293 port = ntohs(sock_in->sin_port); 294 port_e = ntohs(sock_in_e->sin_port); 295 } 296 297 if (ip_match && (port_e == port) && 298 (np->np_network_transport == network_transport)) 299 return true; 300 301 return false; 302 } 303 iscsit_get_np(struct sockaddr_storage * sockaddr,int network_transport)304 static struct iscsi_np *iscsit_get_np( 305 struct sockaddr_storage *sockaddr, 306 int network_transport) 307 { 308 struct iscsi_np *np; 309 bool match; 310 311 lockdep_assert_held(&np_lock); 312 313 list_for_each_entry(np, &g_np_list, np_list) { 314 spin_lock_bh(&np->np_thread_lock); 315 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 316 spin_unlock_bh(&np->np_thread_lock); 317 continue; 318 } 319 320 match = iscsit_check_np_match(sockaddr, np, network_transport); 321 if (match) { 322 /* 323 * Increment the np_exports reference count now to 324 * prevent iscsit_del_np() below from being called 325 * while iscsi_tpg_add_network_portal() is called. 326 */ 327 np->np_exports++; 328 spin_unlock_bh(&np->np_thread_lock); 329 return np; 330 } 331 spin_unlock_bh(&np->np_thread_lock); 332 } 333 334 return NULL; 335 } 336 iscsit_add_np(struct sockaddr_storage * sockaddr,int network_transport)337 struct iscsi_np *iscsit_add_np( 338 struct sockaddr_storage *sockaddr, 339 int network_transport) 340 { 341 struct iscsi_np *np; 342 int ret; 343 344 mutex_lock(&np_lock); 345 346 /* 347 * Locate the existing struct iscsi_np if already active.. 348 */ 349 np = iscsit_get_np(sockaddr, network_transport); 350 if (np) { 351 mutex_unlock(&np_lock); 352 return np; 353 } 354 355 np = kzalloc(sizeof(*np), GFP_KERNEL); 356 if (!np) { 357 mutex_unlock(&np_lock); 358 return ERR_PTR(-ENOMEM); 359 } 360 361 np->np_flags |= NPF_IP_NETWORK; 362 np->np_network_transport = network_transport; 363 spin_lock_init(&np->np_thread_lock); 364 init_completion(&np->np_restart_comp); 365 INIT_LIST_HEAD(&np->np_list); 366 367 ret = iscsi_target_setup_login_socket(np, sockaddr); 368 if (ret != 0) { 369 kfree(np); 370 mutex_unlock(&np_lock); 371 return ERR_PTR(ret); 372 } 373 374 np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np"); 375 if (IS_ERR(np->np_thread)) { 376 pr_err("Unable to create kthread: iscsi_np\n"); 377 ret = PTR_ERR(np->np_thread); 378 kfree(np); 379 mutex_unlock(&np_lock); 380 return ERR_PTR(ret); 381 } 382 /* 383 * Increment the np_exports reference count now to prevent 384 * iscsit_del_np() below from being run while a new call to 385 * iscsi_tpg_add_network_portal() for a matching iscsi_np is 386 * active. We don't need to hold np->np_thread_lock at this 387 * point because iscsi_np has not been added to g_np_list yet. 388 */ 389 np->np_exports = 1; 390 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 391 392 list_add_tail(&np->np_list, &g_np_list); 393 mutex_unlock(&np_lock); 394 395 pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n", 396 &np->np_sockaddr, np->np_transport->name); 397 398 return np; 399 } 400 iscsit_reset_np_thread(struct iscsi_np * np,struct iscsi_tpg_np * tpg_np,struct iscsi_portal_group * tpg,bool shutdown)401 int iscsit_reset_np_thread( 402 struct iscsi_np *np, 403 struct iscsi_tpg_np *tpg_np, 404 struct iscsi_portal_group *tpg, 405 bool shutdown) 406 { 407 spin_lock_bh(&np->np_thread_lock); 408 if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) { 409 spin_unlock_bh(&np->np_thread_lock); 410 return 0; 411 } 412 np->np_thread_state = ISCSI_NP_THREAD_RESET; 413 atomic_inc(&np->np_reset_count); 414 415 if (np->np_thread) { 416 spin_unlock_bh(&np->np_thread_lock); 417 send_sig(SIGINT, np->np_thread, 1); 418 wait_for_completion(&np->np_restart_comp); 419 spin_lock_bh(&np->np_thread_lock); 420 } 421 spin_unlock_bh(&np->np_thread_lock); 422 423 if (tpg_np && shutdown) { 424 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put); 425 426 wait_for_completion(&tpg_np->tpg_np_comp); 427 } 428 429 return 0; 430 } 431 iscsit_free_np(struct iscsi_np * np)432 static void iscsit_free_np(struct iscsi_np *np) 433 { 434 if (np->np_socket) 435 sock_release(np->np_socket); 436 } 437 iscsit_del_np(struct iscsi_np * np)438 int iscsit_del_np(struct iscsi_np *np) 439 { 440 spin_lock_bh(&np->np_thread_lock); 441 np->np_exports--; 442 if (np->np_exports) { 443 np->enabled = true; 444 spin_unlock_bh(&np->np_thread_lock); 445 return 0; 446 } 447 np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN; 448 spin_unlock_bh(&np->np_thread_lock); 449 450 if (np->np_thread) { 451 /* 452 * We need to send the signal to wakeup Linux/Net 453 * which may be sleeping in sock_accept().. 454 */ 455 send_sig(SIGINT, np->np_thread, 1); 456 kthread_stop(np->np_thread); 457 np->np_thread = NULL; 458 } 459 460 np->np_transport->iscsit_free_np(np); 461 462 mutex_lock(&np_lock); 463 list_del(&np->np_list); 464 mutex_unlock(&np_lock); 465 466 pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n", 467 &np->np_sockaddr, np->np_transport->name); 468 469 iscsit_put_transport(np->np_transport); 470 kfree(np); 471 return 0; 472 } 473 474 static void iscsit_get_rx_pdu(struct iscsit_conn *); 475 iscsit_queue_rsp(struct iscsit_conn * conn,struct iscsit_cmd * cmd)476 int iscsit_queue_rsp(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 477 { 478 return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 479 } 480 EXPORT_SYMBOL(iscsit_queue_rsp); 481 iscsit_aborted_task(struct iscsit_conn * conn,struct iscsit_cmd * cmd)482 void iscsit_aborted_task(struct iscsit_conn *conn, struct iscsit_cmd *cmd) 483 { 484 spin_lock_bh(&conn->cmd_lock); 485 if (!list_empty(&cmd->i_conn_node)) 486 list_del_init(&cmd->i_conn_node); 487 spin_unlock_bh(&conn->cmd_lock); 488 489 __iscsit_free_cmd(cmd, true); 490 } 491 EXPORT_SYMBOL(iscsit_aborted_task); 492 493 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *, 494 u32, u32, const void *, void *); 495 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *); 496 497 static int iscsit_xmit_nondatain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const void * data_buf,u32 data_buf_len)498 iscsit_xmit_nondatain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 499 const void *data_buf, u32 data_buf_len) 500 { 501 struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu; 502 struct kvec *iov; 503 u32 niov = 0, tx_size = ISCSI_HDR_LEN; 504 int ret; 505 506 iov = &cmd->iov_misc[0]; 507 iov[niov].iov_base = cmd->pdu; 508 iov[niov++].iov_len = ISCSI_HDR_LEN; 509 510 if (conn->conn_ops->HeaderDigest) { 511 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 512 513 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr, 514 ISCSI_HDR_LEN, 0, NULL, 515 header_digest); 516 517 iov[0].iov_len += ISCSI_CRC_LEN; 518 tx_size += ISCSI_CRC_LEN; 519 pr_debug("Attaching CRC32C HeaderDigest" 520 " to opcode 0x%x 0x%08x\n", 521 hdr->opcode, *header_digest); 522 } 523 524 if (data_buf_len) { 525 u32 padding = ((-data_buf_len) & 3); 526 527 iov[niov].iov_base = (void *)data_buf; 528 iov[niov++].iov_len = data_buf_len; 529 tx_size += data_buf_len; 530 531 if (padding != 0) { 532 iov[niov].iov_base = &cmd->pad_bytes; 533 iov[niov++].iov_len = padding; 534 tx_size += padding; 535 pr_debug("Attaching %u additional" 536 " padding bytes.\n", padding); 537 } 538 539 if (conn->conn_ops->DataDigest) { 540 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, 541 data_buf, data_buf_len, 542 padding, &cmd->pad_bytes, 543 &cmd->data_crc); 544 545 iov[niov].iov_base = &cmd->data_crc; 546 iov[niov++].iov_len = ISCSI_CRC_LEN; 547 tx_size += ISCSI_CRC_LEN; 548 pr_debug("Attached DataDigest for %u" 549 " bytes opcode 0x%x, CRC 0x%08x\n", 550 data_buf_len, hdr->opcode, cmd->data_crc); 551 } 552 } 553 554 cmd->iov_misc_count = niov; 555 cmd->tx_size = tx_size; 556 557 ret = iscsit_send_tx_data(cmd, conn, 1); 558 if (ret < 0) { 559 iscsit_tx_thread_wait_for_tcp(conn); 560 return ret; 561 } 562 563 return 0; 564 } 565 566 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 567 u32 data_offset, u32 data_length); 568 static void iscsit_unmap_iovec(struct iscsit_cmd *); 569 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsit_cmd *, 570 u32, u32, u32, u8 *); 571 static int iscsit_xmit_datain_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,const struct iscsi_datain * datain)572 iscsit_xmit_datain_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 573 const struct iscsi_datain *datain) 574 { 575 struct kvec *iov; 576 u32 iov_count = 0, tx_size = 0; 577 int ret, iov_ret; 578 579 iov = &cmd->iov_data[0]; 580 iov[iov_count].iov_base = cmd->pdu; 581 iov[iov_count++].iov_len = ISCSI_HDR_LEN; 582 tx_size += ISCSI_HDR_LEN; 583 584 if (conn->conn_ops->HeaderDigest) { 585 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN]; 586 587 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu, 588 ISCSI_HDR_LEN, 0, NULL, 589 header_digest); 590 591 iov[0].iov_len += ISCSI_CRC_LEN; 592 tx_size += ISCSI_CRC_LEN; 593 594 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n", 595 *header_digest); 596 } 597 598 iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count], 599 cmd->orig_iov_data_count - (iov_count + 2), 600 datain->offset, datain->length); 601 if (iov_ret < 0) 602 return -1; 603 604 iov_count += iov_ret; 605 tx_size += datain->length; 606 607 cmd->padding = ((-datain->length) & 3); 608 if (cmd->padding) { 609 iov[iov_count].iov_base = cmd->pad_bytes; 610 iov[iov_count++].iov_len = cmd->padding; 611 tx_size += cmd->padding; 612 613 pr_debug("Attaching %u padding bytes\n", cmd->padding); 614 } 615 616 if (conn->conn_ops->DataDigest) { 617 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash, 618 cmd, datain->offset, 619 datain->length, 620 cmd->padding, 621 cmd->pad_bytes); 622 623 iov[iov_count].iov_base = &cmd->data_crc; 624 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 625 tx_size += ISCSI_CRC_LEN; 626 627 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n", 628 datain->length + cmd->padding, cmd->data_crc); 629 } 630 631 cmd->iov_data_count = iov_count; 632 cmd->tx_size = tx_size; 633 634 ret = iscsit_fe_sendpage_sg(cmd, conn); 635 636 iscsit_unmap_iovec(cmd); 637 638 if (ret < 0) { 639 iscsit_tx_thread_wait_for_tcp(conn); 640 return ret; 641 } 642 643 return 0; 644 } 645 iscsit_xmit_pdu(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_datain_req * dr,const void * buf,u32 buf_len)646 static int iscsit_xmit_pdu(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 647 struct iscsi_datain_req *dr, const void *buf, 648 u32 buf_len) 649 { 650 if (dr) 651 return iscsit_xmit_datain_pdu(conn, cmd, buf); 652 else 653 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len); 654 } 655 iscsit_get_sup_prot_ops(struct iscsit_conn * conn)656 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsit_conn *conn) 657 { 658 return TARGET_PROT_NORMAL; 659 } 660 661 static struct iscsit_transport iscsi_target_transport = { 662 .name = "iSCSI/TCP", 663 .transport_type = ISCSI_TCP, 664 .rdma_shutdown = false, 665 .owner = NULL, 666 .iscsit_setup_np = iscsit_setup_np, 667 .iscsit_accept_np = iscsit_accept_np, 668 .iscsit_free_np = iscsit_free_np, 669 .iscsit_get_login_rx = iscsit_get_login_rx, 670 .iscsit_put_login_tx = iscsit_put_login_tx, 671 .iscsit_get_dataout = iscsit_build_r2ts_for_cmd, 672 .iscsit_immediate_queue = iscsit_immediate_queue, 673 .iscsit_response_queue = iscsit_response_queue, 674 .iscsit_queue_data_in = iscsit_queue_rsp, 675 .iscsit_queue_status = iscsit_queue_rsp, 676 .iscsit_aborted_task = iscsit_aborted_task, 677 .iscsit_xmit_pdu = iscsit_xmit_pdu, 678 .iscsit_get_rx_pdu = iscsit_get_rx_pdu, 679 .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops, 680 }; 681 iscsi_target_init_module(void)682 static int __init iscsi_target_init_module(void) 683 { 684 int ret = 0, size; 685 686 pr_debug("iSCSI-Target "ISCSIT_VERSION"\n"); 687 iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL); 688 if (!iscsit_global) 689 return -1; 690 691 spin_lock_init(&iscsit_global->ts_bitmap_lock); 692 mutex_init(&auth_id_lock); 693 idr_init(&tiqn_idr); 694 695 ret = target_register_template(&iscsi_ops); 696 if (ret) 697 goto out; 698 699 size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long); 700 iscsit_global->ts_bitmap = vzalloc(size); 701 if (!iscsit_global->ts_bitmap) 702 goto configfs_out; 703 704 if (!zalloc_cpumask_var(&iscsit_global->allowed_cpumask, GFP_KERNEL)) { 705 pr_err("Unable to allocate iscsit_global->allowed_cpumask\n"); 706 goto bitmap_out; 707 } 708 cpumask_setall(iscsit_global->allowed_cpumask); 709 710 lio_qr_cache = kmem_cache_create("lio_qr_cache", 711 sizeof(struct iscsi_queue_req), 712 __alignof__(struct iscsi_queue_req), 0, NULL); 713 if (!lio_qr_cache) { 714 pr_err("Unable to kmem_cache_create() for" 715 " lio_qr_cache\n"); 716 goto cpumask_out; 717 } 718 719 lio_dr_cache = kmem_cache_create("lio_dr_cache", 720 sizeof(struct iscsi_datain_req), 721 __alignof__(struct iscsi_datain_req), 0, NULL); 722 if (!lio_dr_cache) { 723 pr_err("Unable to kmem_cache_create() for" 724 " lio_dr_cache\n"); 725 goto qr_out; 726 } 727 728 lio_ooo_cache = kmem_cache_create("lio_ooo_cache", 729 sizeof(struct iscsi_ooo_cmdsn), 730 __alignof__(struct iscsi_ooo_cmdsn), 0, NULL); 731 if (!lio_ooo_cache) { 732 pr_err("Unable to kmem_cache_create() for" 733 " lio_ooo_cache\n"); 734 goto dr_out; 735 } 736 737 lio_r2t_cache = kmem_cache_create("lio_r2t_cache", 738 sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t), 739 0, NULL); 740 if (!lio_r2t_cache) { 741 pr_err("Unable to kmem_cache_create() for" 742 " lio_r2t_cache\n"); 743 goto ooo_out; 744 } 745 746 iscsit_register_transport(&iscsi_target_transport); 747 748 if (iscsit_load_discovery_tpg() < 0) 749 goto r2t_out; 750 751 return ret; 752 r2t_out: 753 iscsit_unregister_transport(&iscsi_target_transport); 754 kmem_cache_destroy(lio_r2t_cache); 755 ooo_out: 756 kmem_cache_destroy(lio_ooo_cache); 757 dr_out: 758 kmem_cache_destroy(lio_dr_cache); 759 qr_out: 760 kmem_cache_destroy(lio_qr_cache); 761 cpumask_out: 762 free_cpumask_var(iscsit_global->allowed_cpumask); 763 bitmap_out: 764 vfree(iscsit_global->ts_bitmap); 765 configfs_out: 766 /* XXX: this probably wants it to be it's own unwind step.. */ 767 if (iscsit_global->discovery_tpg) 768 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 769 target_unregister_template(&iscsi_ops); 770 out: 771 kfree(iscsit_global); 772 return -ENOMEM; 773 } 774 iscsi_target_cleanup_module(void)775 static void __exit iscsi_target_cleanup_module(void) 776 { 777 iscsit_release_discovery_tpg(); 778 iscsit_unregister_transport(&iscsi_target_transport); 779 kmem_cache_destroy(lio_qr_cache); 780 kmem_cache_destroy(lio_dr_cache); 781 kmem_cache_destroy(lio_ooo_cache); 782 kmem_cache_destroy(lio_r2t_cache); 783 784 /* 785 * Shutdown discovery sessions and disable discovery TPG 786 */ 787 if (iscsit_global->discovery_tpg) 788 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1); 789 790 target_unregister_template(&iscsi_ops); 791 792 free_cpumask_var(iscsit_global->allowed_cpumask); 793 vfree(iscsit_global->ts_bitmap); 794 kfree(iscsit_global); 795 } 796 iscsit_add_reject(struct iscsit_conn * conn,u8 reason,unsigned char * buf)797 int iscsit_add_reject( 798 struct iscsit_conn *conn, 799 u8 reason, 800 unsigned char *buf) 801 { 802 struct iscsit_cmd *cmd; 803 804 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 805 if (!cmd) 806 return -1; 807 808 cmd->iscsi_opcode = ISCSI_OP_REJECT; 809 cmd->reject_reason = reason; 810 811 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 812 if (!cmd->buf_ptr) { 813 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 814 iscsit_free_cmd(cmd, false); 815 return -1; 816 } 817 818 spin_lock_bh(&conn->cmd_lock); 819 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 820 spin_unlock_bh(&conn->cmd_lock); 821 822 cmd->i_state = ISTATE_SEND_REJECT; 823 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 824 825 return -1; 826 } 827 EXPORT_SYMBOL(iscsit_add_reject); 828 iscsit_add_reject_from_cmd(struct iscsit_cmd * cmd,u8 reason,bool add_to_conn,unsigned char * buf)829 static int iscsit_add_reject_from_cmd( 830 struct iscsit_cmd *cmd, 831 u8 reason, 832 bool add_to_conn, 833 unsigned char *buf) 834 { 835 struct iscsit_conn *conn; 836 const bool do_put = cmd->se_cmd.se_tfo != NULL; 837 838 if (!cmd->conn) { 839 pr_err("cmd->conn is NULL for ITT: 0x%08x\n", 840 cmd->init_task_tag); 841 return -1; 842 } 843 conn = cmd->conn; 844 845 cmd->iscsi_opcode = ISCSI_OP_REJECT; 846 cmd->reject_reason = reason; 847 848 cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL); 849 if (!cmd->buf_ptr) { 850 pr_err("Unable to allocate memory for cmd->buf_ptr\n"); 851 iscsit_free_cmd(cmd, false); 852 return -1; 853 } 854 855 if (add_to_conn) { 856 spin_lock_bh(&conn->cmd_lock); 857 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 858 spin_unlock_bh(&conn->cmd_lock); 859 } 860 861 cmd->i_state = ISTATE_SEND_REJECT; 862 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 863 /* 864 * Perform the kref_put now if se_cmd has already been setup by 865 * scsit_setup_scsi_cmd() 866 */ 867 if (do_put) { 868 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n"); 869 target_put_sess_cmd(&cmd->se_cmd); 870 } 871 return -1; 872 } 873 iscsit_add_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)874 static int iscsit_add_reject_cmd(struct iscsit_cmd *cmd, u8 reason, 875 unsigned char *buf) 876 { 877 return iscsit_add_reject_from_cmd(cmd, reason, true, buf); 878 } 879 iscsit_reject_cmd(struct iscsit_cmd * cmd,u8 reason,unsigned char * buf)880 int iscsit_reject_cmd(struct iscsit_cmd *cmd, u8 reason, unsigned char *buf) 881 { 882 return iscsit_add_reject_from_cmd(cmd, reason, false, buf); 883 } 884 EXPORT_SYMBOL(iscsit_reject_cmd); 885 886 /* 887 * Map some portion of the allocated scatterlist to an iovec, suitable for 888 * kernel sockets to copy data in/out. 889 */ iscsit_map_iovec(struct iscsit_cmd * cmd,struct kvec * iov,int nvec,u32 data_offset,u32 data_length)890 static int iscsit_map_iovec(struct iscsit_cmd *cmd, struct kvec *iov, int nvec, 891 u32 data_offset, u32 data_length) 892 { 893 u32 i = 0, orig_data_length = data_length; 894 struct scatterlist *sg; 895 unsigned int page_off; 896 897 /* 898 * We know each entry in t_data_sg contains a page. 899 */ 900 u32 ent = data_offset / PAGE_SIZE; 901 902 if (!data_length) 903 return 0; 904 905 if (ent >= cmd->se_cmd.t_data_nents) { 906 pr_err("Initial page entry out-of-bounds\n"); 907 goto overflow; 908 } 909 910 sg = &cmd->se_cmd.t_data_sg[ent]; 911 page_off = (data_offset % PAGE_SIZE); 912 913 cmd->first_data_sg = sg; 914 cmd->first_data_sg_off = page_off; 915 916 while (data_length) { 917 u32 cur_len; 918 919 if (WARN_ON_ONCE(!sg || i >= nvec)) 920 goto overflow; 921 922 cur_len = min_t(u32, data_length, sg->length - page_off); 923 924 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off; 925 iov[i].iov_len = cur_len; 926 927 data_length -= cur_len; 928 page_off = 0; 929 sg = sg_next(sg); 930 i++; 931 } 932 933 cmd->kmapped_nents = i; 934 935 return i; 936 937 overflow: 938 pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n", 939 data_offset, orig_data_length, i, nvec); 940 for_each_sg(cmd->se_cmd.t_data_sg, sg, 941 cmd->se_cmd.t_data_nents, i) { 942 pr_err("[%d] off %d len %d\n", 943 i, sg->offset, sg->length); 944 } 945 return -1; 946 } 947 iscsit_unmap_iovec(struct iscsit_cmd * cmd)948 static void iscsit_unmap_iovec(struct iscsit_cmd *cmd) 949 { 950 u32 i; 951 struct scatterlist *sg; 952 953 sg = cmd->first_data_sg; 954 955 for (i = 0; i < cmd->kmapped_nents; i++) 956 kunmap(sg_page(&sg[i])); 957 } 958 iscsit_ack_from_expstatsn(struct iscsit_conn * conn,u32 exp_statsn)959 static void iscsit_ack_from_expstatsn(struct iscsit_conn *conn, u32 exp_statsn) 960 { 961 LIST_HEAD(ack_list); 962 struct iscsit_cmd *cmd, *cmd_p; 963 964 conn->exp_statsn = exp_statsn; 965 966 if (conn->sess->sess_ops->RDMAExtensions) 967 return; 968 969 spin_lock_bh(&conn->cmd_lock); 970 list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) { 971 spin_lock(&cmd->istate_lock); 972 if ((cmd->i_state == ISTATE_SENT_STATUS) && 973 iscsi_sna_lt(cmd->stat_sn, exp_statsn)) { 974 cmd->i_state = ISTATE_REMOVE; 975 spin_unlock(&cmd->istate_lock); 976 list_move_tail(&cmd->i_conn_node, &ack_list); 977 continue; 978 } 979 spin_unlock(&cmd->istate_lock); 980 } 981 spin_unlock_bh(&conn->cmd_lock); 982 983 list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) { 984 list_del_init(&cmd->i_conn_node); 985 iscsit_free_cmd(cmd, false); 986 } 987 } 988 iscsit_allocate_iovecs(struct iscsit_cmd * cmd)989 static int iscsit_allocate_iovecs(struct iscsit_cmd *cmd) 990 { 991 u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE)); 992 993 iov_count += ISCSI_IOV_DATA_BUFFER; 994 cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL); 995 if (!cmd->iov_data) 996 return -ENOMEM; 997 998 cmd->orig_iov_data_count = iov_count; 999 return 0; 1000 } 1001 iscsit_setup_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1002 int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1003 unsigned char *buf) 1004 { 1005 int data_direction, payload_length; 1006 struct iscsi_ecdb_ahdr *ecdb_ahdr; 1007 struct iscsi_scsi_req *hdr; 1008 int iscsi_task_attr; 1009 unsigned char *cdb; 1010 int sam_task_attr; 1011 1012 atomic_long_inc(&conn->sess->cmd_pdus); 1013 1014 hdr = (struct iscsi_scsi_req *) buf; 1015 payload_length = ntoh24(hdr->dlength); 1016 1017 /* FIXME; Add checks for AdditionalHeaderSegment */ 1018 1019 if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) && 1020 !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1021 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL" 1022 " not set. Bad iSCSI Initiator.\n"); 1023 return iscsit_add_reject_cmd(cmd, 1024 ISCSI_REASON_BOOKMARK_INVALID, buf); 1025 } 1026 1027 if (((hdr->flags & ISCSI_FLAG_CMD_READ) || 1028 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) { 1029 /* 1030 * From RFC-3720 Section 10.3.1: 1031 * 1032 * "Either or both of R and W MAY be 1 when either the 1033 * Expected Data Transfer Length and/or Bidirectional Read 1034 * Expected Data Transfer Length are 0" 1035 * 1036 * For this case, go ahead and clear the unnecssary bits 1037 * to avoid any confusion with ->data_direction. 1038 */ 1039 hdr->flags &= ~ISCSI_FLAG_CMD_READ; 1040 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE; 1041 1042 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE" 1043 " set when Expected Data Transfer Length is 0 for" 1044 " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]); 1045 } 1046 1047 if (!(hdr->flags & ISCSI_FLAG_CMD_READ) && 1048 !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) { 1049 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE" 1050 " MUST be set if Expected Data Transfer Length is not 0." 1051 " Bad iSCSI Initiator\n"); 1052 return iscsit_add_reject_cmd(cmd, 1053 ISCSI_REASON_BOOKMARK_INVALID, buf); 1054 } 1055 1056 if ((hdr->flags & ISCSI_FLAG_CMD_READ) && 1057 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) { 1058 pr_err("Bidirectional operations not supported!\n"); 1059 return iscsit_add_reject_cmd(cmd, 1060 ISCSI_REASON_BOOKMARK_INVALID, buf); 1061 } 1062 1063 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1064 pr_err("Illegally set Immediate Bit in iSCSI Initiator" 1065 " Scsi Command PDU.\n"); 1066 return iscsit_add_reject_cmd(cmd, 1067 ISCSI_REASON_BOOKMARK_INVALID, buf); 1068 } 1069 1070 if (payload_length && !conn->sess->sess_ops->ImmediateData) { 1071 pr_err("ImmediateData=No but DataSegmentLength=%u," 1072 " protocol error.\n", payload_length); 1073 return iscsit_add_reject_cmd(cmd, 1074 ISCSI_REASON_PROTOCOL_ERROR, buf); 1075 } 1076 1077 if ((be32_to_cpu(hdr->data_length) == payload_length) && 1078 (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) { 1079 pr_err("Expected Data Transfer Length and Length of" 1080 " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL" 1081 " bit is not set protocol error\n"); 1082 return iscsit_add_reject_cmd(cmd, 1083 ISCSI_REASON_PROTOCOL_ERROR, buf); 1084 } 1085 1086 if (payload_length > be32_to_cpu(hdr->data_length)) { 1087 pr_err("DataSegmentLength: %u is greater than" 1088 " EDTL: %u, protocol error.\n", payload_length, 1089 hdr->data_length); 1090 return iscsit_add_reject_cmd(cmd, 1091 ISCSI_REASON_PROTOCOL_ERROR, buf); 1092 } 1093 1094 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1095 pr_err("DataSegmentLength: %u is greater than" 1096 " MaxXmitDataSegmentLength: %u, protocol error.\n", 1097 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 1098 return iscsit_add_reject_cmd(cmd, 1099 ISCSI_REASON_PROTOCOL_ERROR, buf); 1100 } 1101 1102 if (payload_length > conn->sess->sess_ops->FirstBurstLength) { 1103 pr_err("DataSegmentLength: %u is greater than" 1104 " FirstBurstLength: %u, protocol error.\n", 1105 payload_length, conn->sess->sess_ops->FirstBurstLength); 1106 return iscsit_add_reject_cmd(cmd, 1107 ISCSI_REASON_BOOKMARK_INVALID, buf); 1108 } 1109 1110 cdb = hdr->cdb; 1111 1112 if (hdr->hlength) { 1113 ecdb_ahdr = (struct iscsi_ecdb_ahdr *) (hdr + 1); 1114 if (ecdb_ahdr->ahstype != ISCSI_AHSTYPE_CDB) { 1115 pr_err("Additional Header Segment type %d not supported!\n", 1116 ecdb_ahdr->ahstype); 1117 return iscsit_add_reject_cmd(cmd, 1118 ISCSI_REASON_CMD_NOT_SUPPORTED, buf); 1119 } 1120 1121 cdb = kmalloc(be16_to_cpu(ecdb_ahdr->ahslength) + 15, 1122 GFP_KERNEL); 1123 if (cdb == NULL) 1124 return iscsit_add_reject_cmd(cmd, 1125 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1126 memcpy(cdb, hdr->cdb, ISCSI_CDB_SIZE); 1127 memcpy(cdb + ISCSI_CDB_SIZE, ecdb_ahdr->ecdb, 1128 be16_to_cpu(ecdb_ahdr->ahslength) - 1); 1129 } 1130 1131 data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE : 1132 (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE : 1133 DMA_NONE; 1134 1135 cmd->data_direction = data_direction; 1136 iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK; 1137 /* 1138 * Figure out the SAM Task Attribute for the incoming SCSI CDB 1139 */ 1140 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 1141 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 1142 sam_task_attr = TCM_SIMPLE_TAG; 1143 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 1144 sam_task_attr = TCM_ORDERED_TAG; 1145 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 1146 sam_task_attr = TCM_HEAD_TAG; 1147 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 1148 sam_task_attr = TCM_ACA_TAG; 1149 else { 1150 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 1151 " TCM_SIMPLE_TAG\n", iscsi_task_attr); 1152 sam_task_attr = TCM_SIMPLE_TAG; 1153 } 1154 1155 cmd->iscsi_opcode = ISCSI_OP_SCSI_CMD; 1156 cmd->i_state = ISTATE_NEW_CMD; 1157 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 1158 cmd->immediate_data = (payload_length) ? 1 : 0; 1159 cmd->unsolicited_data = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) && 1160 (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0); 1161 if (cmd->unsolicited_data) 1162 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA; 1163 1164 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1165 if (hdr->flags & ISCSI_FLAG_CMD_READ) 1166 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 1167 else 1168 cmd->targ_xfer_tag = 0xFFFFFFFF; 1169 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1170 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1171 cmd->first_burst_len = payload_length; 1172 1173 if (!conn->sess->sess_ops->RDMAExtensions && 1174 cmd->data_direction == DMA_FROM_DEVICE) { 1175 struct iscsi_datain_req *dr; 1176 1177 dr = iscsit_allocate_datain_req(); 1178 if (!dr) { 1179 if (cdb != hdr->cdb) 1180 kfree(cdb); 1181 return iscsit_add_reject_cmd(cmd, 1182 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1183 } 1184 1185 iscsit_attach_datain_req(cmd, dr); 1186 } 1187 1188 /* 1189 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 1190 */ 1191 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 1192 conn->sess->se_sess, be32_to_cpu(hdr->data_length), 1193 cmd->data_direction, sam_task_attr, 1194 cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun), 1195 conn->cmd_cnt); 1196 1197 pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," 1198 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, 1199 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length, 1200 conn->cid); 1201 1202 target_get_sess_cmd(&cmd->se_cmd, true); 1203 1204 cmd->se_cmd.tag = (__force u32)cmd->init_task_tag; 1205 cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, cdb, 1206 GFP_KERNEL); 1207 1208 if (cdb != hdr->cdb) 1209 kfree(cdb); 1210 1211 if (cmd->sense_reason) { 1212 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) { 1213 return iscsit_add_reject_cmd(cmd, 1214 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1215 } 1216 1217 goto attach_cmd; 1218 } 1219 1220 cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd); 1221 if (cmd->sense_reason) 1222 goto attach_cmd; 1223 1224 cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd); 1225 if (cmd->sense_reason) 1226 goto attach_cmd; 1227 1228 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) { 1229 return iscsit_add_reject_cmd(cmd, 1230 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1231 } 1232 1233 attach_cmd: 1234 spin_lock_bh(&conn->cmd_lock); 1235 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1236 spin_unlock_bh(&conn->cmd_lock); 1237 return 0; 1238 } 1239 EXPORT_SYMBOL(iscsit_setup_scsi_cmd); 1240 iscsit_set_unsolicited_dataout(struct iscsit_cmd * cmd)1241 void iscsit_set_unsolicited_dataout(struct iscsit_cmd *cmd) 1242 { 1243 iscsit_set_dataout_sequence_values(cmd); 1244 1245 spin_lock_bh(&cmd->dataout_timeout_lock); 1246 iscsit_start_dataout_timer(cmd, cmd->conn); 1247 spin_unlock_bh(&cmd->dataout_timeout_lock); 1248 } 1249 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout); 1250 iscsit_process_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr)1251 int iscsit_process_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1252 struct iscsi_scsi_req *hdr) 1253 { 1254 int cmdsn_ret = 0; 1255 /* 1256 * Check the CmdSN against ExpCmdSN/MaxCmdSN here if 1257 * the Immediate Bit is not set, and no Immediate 1258 * Data is attached. 1259 * 1260 * A PDU/CmdSN carrying Immediate Data can only 1261 * be processed after the DataCRC has passed. 1262 * If the DataCRC fails, the CmdSN MUST NOT 1263 * be acknowledged. (See below) 1264 */ 1265 if (!cmd->immediate_data) { 1266 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1267 (unsigned char *)hdr, hdr->cmdsn); 1268 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1269 return -1; 1270 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1271 target_put_sess_cmd(&cmd->se_cmd); 1272 return 0; 1273 } 1274 } 1275 1276 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1277 1278 /* 1279 * If no Immediate Data is attached, it's OK to return now. 1280 */ 1281 if (!cmd->immediate_data) { 1282 if (!cmd->sense_reason && cmd->unsolicited_data) 1283 iscsit_set_unsolicited_dataout(cmd); 1284 if (!cmd->sense_reason) 1285 return 0; 1286 1287 target_put_sess_cmd(&cmd->se_cmd); 1288 return 0; 1289 } 1290 1291 /* 1292 * Early CHECK_CONDITIONs with ImmediateData never make it to command 1293 * execution. These exceptions are processed in CmdSN order using 1294 * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below. 1295 */ 1296 if (cmd->sense_reason) 1297 return 1; 1298 /* 1299 * Call directly into transport_generic_new_cmd() to perform 1300 * the backend memory allocation. 1301 */ 1302 cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd); 1303 if (cmd->sense_reason) 1304 return 1; 1305 1306 return 0; 1307 } 1308 EXPORT_SYMBOL(iscsit_process_scsi_cmd); 1309 1310 static int iscsit_get_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,bool dump_payload)1311 iscsit_get_immediate_data(struct iscsit_cmd *cmd, struct iscsi_scsi_req *hdr, 1312 bool dump_payload) 1313 { 1314 int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION; 1315 int rc; 1316 1317 /* 1318 * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes. 1319 */ 1320 if (dump_payload) { 1321 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done, 1322 cmd->first_burst_len); 1323 1324 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n", 1325 cmd->se_cmd.data_length, cmd->write_data_done, 1326 cmd->first_burst_len, length); 1327 rc = iscsit_dump_data_payload(cmd->conn, length, 1); 1328 pr_debug("Finished dumping immediate data\n"); 1329 if (rc < 0) 1330 immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER; 1331 } else { 1332 immed_ret = iscsit_handle_immediate_data(cmd, hdr, 1333 cmd->first_burst_len); 1334 } 1335 1336 if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) { 1337 /* 1338 * A PDU/CmdSN carrying Immediate Data passed 1339 * DataCRC, check against ExpCmdSN/MaxCmdSN if 1340 * Immediate Bit is not set. 1341 */ 1342 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, 1343 (unsigned char *)hdr, hdr->cmdsn); 1344 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1345 return -1; 1346 1347 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 1348 target_put_sess_cmd(&cmd->se_cmd); 1349 1350 return 0; 1351 } else if (cmd->unsolicited_data) 1352 iscsit_set_unsolicited_dataout(cmd); 1353 1354 } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) { 1355 /* 1356 * Immediate Data failed DataCRC and ERL>=1, 1357 * silently drop this PDU and let the initiator 1358 * plug the CmdSN gap. 1359 * 1360 * FIXME: Send Unsolicited NOPIN with reserved 1361 * TTT here to help the initiator figure out 1362 * the missing CmdSN, although they should be 1363 * intelligent enough to determine the missing 1364 * CmdSN and issue a retry to plug the sequence. 1365 */ 1366 cmd->i_state = ISTATE_REMOVE; 1367 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state); 1368 } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */ 1369 return -1; 1370 1371 return 0; 1372 } 1373 1374 static int iscsit_handle_scsi_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1375 iscsit_handle_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1376 unsigned char *buf) 1377 { 1378 struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf; 1379 int rc, immed_data; 1380 bool dump_payload = false; 1381 1382 rc = iscsit_setup_scsi_cmd(conn, cmd, buf); 1383 if (rc < 0) 1384 return 0; 1385 /* 1386 * Allocation iovecs needed for struct socket operations for 1387 * traditional iSCSI block I/O. 1388 */ 1389 if (iscsit_allocate_iovecs(cmd) < 0) { 1390 return iscsit_reject_cmd(cmd, 1391 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 1392 } 1393 immed_data = cmd->immediate_data; 1394 1395 rc = iscsit_process_scsi_cmd(conn, cmd, hdr); 1396 if (rc < 0) 1397 return rc; 1398 else if (rc > 0) 1399 dump_payload = true; 1400 1401 if (!immed_data) 1402 return 0; 1403 1404 return iscsit_get_immediate_data(cmd, hdr, dump_payload); 1405 } 1406 iscsit_do_crypto_hash_sg(struct ahash_request * hash,struct iscsit_cmd * cmd,u32 data_offset,u32 data_length,u32 padding,u8 * pad_bytes)1407 static u32 iscsit_do_crypto_hash_sg( 1408 struct ahash_request *hash, 1409 struct iscsit_cmd *cmd, 1410 u32 data_offset, 1411 u32 data_length, 1412 u32 padding, 1413 u8 *pad_bytes) 1414 { 1415 u32 data_crc; 1416 struct scatterlist *sg; 1417 unsigned int page_off; 1418 1419 crypto_ahash_init(hash); 1420 1421 sg = cmd->first_data_sg; 1422 page_off = cmd->first_data_sg_off; 1423 1424 if (data_length && page_off) { 1425 struct scatterlist first_sg; 1426 u32 len = min_t(u32, data_length, sg->length - page_off); 1427 1428 sg_init_table(&first_sg, 1); 1429 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off); 1430 1431 ahash_request_set_crypt(hash, &first_sg, NULL, len); 1432 crypto_ahash_update(hash); 1433 1434 data_length -= len; 1435 sg = sg_next(sg); 1436 } 1437 1438 while (data_length) { 1439 u32 cur_len = min_t(u32, data_length, sg->length); 1440 1441 ahash_request_set_crypt(hash, sg, NULL, cur_len); 1442 crypto_ahash_update(hash); 1443 1444 data_length -= cur_len; 1445 /* iscsit_map_iovec has already checked for invalid sg pointers */ 1446 sg = sg_next(sg); 1447 } 1448 1449 if (padding) { 1450 struct scatterlist pad_sg; 1451 1452 sg_init_one(&pad_sg, pad_bytes, padding); 1453 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc, 1454 padding); 1455 crypto_ahash_finup(hash); 1456 } else { 1457 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0); 1458 crypto_ahash_final(hash); 1459 } 1460 1461 return data_crc; 1462 } 1463 iscsit_do_crypto_hash_buf(struct ahash_request * hash,const void * buf,u32 payload_length,u32 padding,const void * pad_bytes,void * data_crc)1464 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash, 1465 const void *buf, u32 payload_length, u32 padding, 1466 const void *pad_bytes, void *data_crc) 1467 { 1468 struct scatterlist sg[2]; 1469 1470 sg_init_table(sg, ARRAY_SIZE(sg)); 1471 sg_set_buf(sg, buf, payload_length); 1472 if (padding) 1473 sg_set_buf(sg + 1, pad_bytes, padding); 1474 1475 ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding); 1476 1477 crypto_ahash_digest(hash); 1478 } 1479 1480 int __iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd * cmd,u32 payload_length,bool * success)1481 __iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1482 struct iscsit_cmd *cmd, u32 payload_length, 1483 bool *success) 1484 { 1485 struct iscsi_data *hdr = buf; 1486 struct se_cmd *se_cmd; 1487 int rc; 1488 1489 /* iSCSI write */ 1490 atomic_long_add(payload_length, &conn->sess->rx_data_octets); 1491 1492 pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x," 1493 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 1494 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset), 1495 payload_length, conn->cid); 1496 1497 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 1498 pr_err("Command ITT: 0x%08x received DataOUT after" 1499 " last DataOUT received, dumping payload\n", 1500 cmd->init_task_tag); 1501 return iscsit_dump_data_payload(conn, payload_length, 1); 1502 } 1503 1504 if (cmd->data_direction != DMA_TO_DEVICE) { 1505 pr_err("Command ITT: 0x%08x received DataOUT for a" 1506 " NON-WRITE command.\n", cmd->init_task_tag); 1507 return iscsit_dump_data_payload(conn, payload_length, 1); 1508 } 1509 se_cmd = &cmd->se_cmd; 1510 iscsit_mod_dataout_timer(cmd); 1511 1512 if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) { 1513 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n", 1514 be32_to_cpu(hdr->offset), payload_length, 1515 cmd->se_cmd.data_length); 1516 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf); 1517 } 1518 1519 if (cmd->unsolicited_data) { 1520 int dump_unsolicited_data = 0; 1521 1522 if (conn->sess->sess_ops->InitialR2T) { 1523 pr_err("Received unexpected unsolicited data" 1524 " while InitialR2T=Yes, protocol error.\n"); 1525 transport_send_check_condition_and_sense(&cmd->se_cmd, 1526 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 1527 return -1; 1528 } 1529 /* 1530 * Special case for dealing with Unsolicited DataOUT 1531 * and Unsupported SAM WRITE Opcodes and SE resource allocation 1532 * failures; 1533 */ 1534 1535 /* Something's amiss if we're not in WRITE_PENDING state... */ 1536 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING); 1537 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE)) 1538 dump_unsolicited_data = 1; 1539 1540 if (dump_unsolicited_data) { 1541 /* 1542 * Check if a delayed TASK_ABORTED status needs to 1543 * be sent now if the ISCSI_FLAG_CMD_FINAL has been 1544 * received with the unsolicited data out. 1545 */ 1546 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) 1547 iscsit_stop_dataout_timer(cmd); 1548 1549 return iscsit_dump_data_payload(conn, payload_length, 1); 1550 } 1551 } else { 1552 /* 1553 * For the normal solicited data path: 1554 * 1555 * Check for a delayed TASK_ABORTED status and dump any 1556 * incoming data out payload if one exists. Also, when the 1557 * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current 1558 * data out sequence, we decrement outstanding_r2ts. Once 1559 * outstanding_r2ts reaches zero, go ahead and send the delayed 1560 * TASK_ABORTED status. 1561 */ 1562 if (se_cmd->transport_state & CMD_T_ABORTED) { 1563 if (hdr->flags & ISCSI_FLAG_CMD_FINAL && 1564 --cmd->outstanding_r2ts < 1) 1565 iscsit_stop_dataout_timer(cmd); 1566 1567 return iscsit_dump_data_payload(conn, payload_length, 1); 1568 } 1569 } 1570 /* 1571 * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and 1572 * within-command recovery checks before receiving the payload. 1573 */ 1574 rc = iscsit_check_pre_dataout(cmd, buf); 1575 if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY) 1576 return 0; 1577 else if (rc == DATAOUT_CANNOT_RECOVER) 1578 return -1; 1579 *success = true; 1580 return 0; 1581 } 1582 EXPORT_SYMBOL(__iscsit_check_dataout_hdr); 1583 1584 int iscsit_check_dataout_hdr(struct iscsit_conn * conn,void * buf,struct iscsit_cmd ** out_cmd)1585 iscsit_check_dataout_hdr(struct iscsit_conn *conn, void *buf, 1586 struct iscsit_cmd **out_cmd) 1587 { 1588 struct iscsi_data *hdr = buf; 1589 struct iscsit_cmd *cmd; 1590 u32 payload_length = ntoh24(hdr->dlength); 1591 int rc; 1592 bool success = false; 1593 1594 if (!payload_length) { 1595 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n"); 1596 return 0; 1597 } 1598 1599 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1600 pr_err_ratelimited("DataSegmentLength: %u is greater than" 1601 " MaxXmitDataSegmentLength: %u\n", payload_length, 1602 conn->conn_ops->MaxXmitDataSegmentLength); 1603 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf); 1604 } 1605 1606 cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length); 1607 if (!cmd) 1608 return 0; 1609 1610 rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success); 1611 1612 if (success) 1613 *out_cmd = cmd; 1614 1615 return rc; 1616 } 1617 EXPORT_SYMBOL(iscsit_check_dataout_hdr); 1618 1619 static int iscsit_get_dataout(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_data * hdr)1620 iscsit_get_dataout(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1621 struct iscsi_data *hdr) 1622 { 1623 struct kvec *iov; 1624 u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0; 1625 u32 payload_length; 1626 int iov_ret, data_crc_failed = 0; 1627 1628 payload_length = min_t(u32, cmd->se_cmd.data_length, 1629 ntoh24(hdr->dlength)); 1630 rx_size += payload_length; 1631 iov = &cmd->iov_data[0]; 1632 1633 iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2, 1634 be32_to_cpu(hdr->offset), payload_length); 1635 if (iov_ret < 0) 1636 return -1; 1637 1638 iov_count += iov_ret; 1639 1640 padding = ((-payload_length) & 3); 1641 if (padding != 0) { 1642 iov[iov_count].iov_base = cmd->pad_bytes; 1643 iov[iov_count++].iov_len = padding; 1644 rx_size += padding; 1645 pr_debug("Receiving %u padding bytes.\n", padding); 1646 } 1647 1648 if (conn->conn_ops->DataDigest) { 1649 iov[iov_count].iov_base = &checksum; 1650 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 1651 rx_size += ISCSI_CRC_LEN; 1652 } 1653 1654 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 1655 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 1656 1657 iscsit_unmap_iovec(cmd); 1658 1659 if (rx_got != rx_size) 1660 return -1; 1661 1662 if (conn->conn_ops->DataDigest) { 1663 u32 data_crc; 1664 1665 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 1666 be32_to_cpu(hdr->offset), 1667 payload_length, padding, 1668 cmd->pad_bytes); 1669 1670 if (checksum != data_crc) { 1671 pr_err("ITT: 0x%08x, Offset: %u, Length: %u," 1672 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x" 1673 " does not match computed 0x%08x\n", 1674 hdr->itt, hdr->offset, payload_length, 1675 hdr->datasn, checksum, data_crc); 1676 data_crc_failed = 1; 1677 } else { 1678 pr_debug("Got CRC32C DataDigest 0x%08x for" 1679 " %u bytes of Data Out\n", checksum, 1680 payload_length); 1681 } 1682 } 1683 1684 return data_crc_failed; 1685 } 1686 1687 int iscsit_check_dataout_payload(struct iscsit_cmd * cmd,struct iscsi_data * hdr,bool data_crc_failed)1688 iscsit_check_dataout_payload(struct iscsit_cmd *cmd, struct iscsi_data *hdr, 1689 bool data_crc_failed) 1690 { 1691 struct iscsit_conn *conn = cmd->conn; 1692 int rc, ooo_cmdsn; 1693 /* 1694 * Increment post receive data and CRC values or perform 1695 * within-command recovery. 1696 */ 1697 rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed); 1698 if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)) 1699 return 0; 1700 else if (rc == DATAOUT_SEND_R2T) { 1701 iscsit_set_dataout_sequence_values(cmd); 1702 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 1703 } else if (rc == DATAOUT_SEND_TO_TRANSPORT) { 1704 /* 1705 * Handle extra special case for out of order 1706 * Unsolicited Data Out. 1707 */ 1708 spin_lock_bh(&cmd->istate_lock); 1709 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN); 1710 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 1711 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 1712 spin_unlock_bh(&cmd->istate_lock); 1713 1714 iscsit_stop_dataout_timer(cmd); 1715 if (ooo_cmdsn) 1716 return 0; 1717 target_execute_cmd(&cmd->se_cmd); 1718 return 0; 1719 } else /* DATAOUT_CANNOT_RECOVER */ 1720 return -1; 1721 1722 return 0; 1723 } 1724 EXPORT_SYMBOL(iscsit_check_dataout_payload); 1725 iscsit_handle_data_out(struct iscsit_conn * conn,unsigned char * buf)1726 static int iscsit_handle_data_out(struct iscsit_conn *conn, unsigned char *buf) 1727 { 1728 struct iscsit_cmd *cmd = NULL; 1729 struct iscsi_data *hdr = (struct iscsi_data *)buf; 1730 int rc; 1731 bool data_crc_failed = false; 1732 1733 rc = iscsit_check_dataout_hdr(conn, buf, &cmd); 1734 if (rc < 0) 1735 return 0; 1736 else if (!cmd) 1737 return 0; 1738 1739 rc = iscsit_get_dataout(conn, cmd, hdr); 1740 if (rc < 0) 1741 return rc; 1742 else if (rc > 0) 1743 data_crc_failed = true; 1744 1745 return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed); 1746 } 1747 iscsit_setup_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1748 int iscsit_setup_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1749 struct iscsi_nopout *hdr) 1750 { 1751 u32 payload_length = ntoh24(hdr->dlength); 1752 1753 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) { 1754 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n"); 1755 if (!cmd) 1756 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1757 (unsigned char *)hdr); 1758 1759 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1760 (unsigned char *)hdr); 1761 } 1762 1763 if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 1764 pr_err("NOPOUT ITT is reserved, but Immediate Bit is" 1765 " not set, protocol error.\n"); 1766 if (!cmd) 1767 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1768 (unsigned char *)hdr); 1769 1770 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1771 (unsigned char *)hdr); 1772 } 1773 1774 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 1775 pr_err("NOPOUT Ping Data DataSegmentLength: %u is" 1776 " greater than MaxXmitDataSegmentLength: %u, protocol" 1777 " error.\n", payload_length, 1778 conn->conn_ops->MaxXmitDataSegmentLength); 1779 if (!cmd) 1780 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1781 (unsigned char *)hdr); 1782 1783 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 1784 (unsigned char *)hdr); 1785 } 1786 1787 pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x," 1788 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n", 1789 hdr->itt == RESERVED_ITT ? "Response" : "Request", 1790 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn, 1791 payload_length); 1792 /* 1793 * This is not a response to a Unsolicited NopIN, which means 1794 * it can either be a NOPOUT ping request (with a valid ITT), 1795 * or a NOPOUT not requesting a NOPIN (with a reserved ITT). 1796 * Either way, make sure we allocate an struct iscsit_cmd, as both 1797 * can contain ping data. 1798 */ 1799 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1800 cmd->iscsi_opcode = ISCSI_OP_NOOP_OUT; 1801 cmd->i_state = ISTATE_SEND_NOPIN; 1802 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1803 1 : 0); 1804 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 1805 cmd->targ_xfer_tag = 0xFFFFFFFF; 1806 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 1807 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 1808 cmd->data_direction = DMA_NONE; 1809 } 1810 1811 return 0; 1812 } 1813 EXPORT_SYMBOL(iscsit_setup_nop_out); 1814 iscsit_process_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_nopout * hdr)1815 int iscsit_process_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1816 struct iscsi_nopout *hdr) 1817 { 1818 struct iscsit_cmd *cmd_p = NULL; 1819 int cmdsn_ret = 0; 1820 /* 1821 * Initiator is expecting a NopIN ping reply.. 1822 */ 1823 if (hdr->itt != RESERVED_ITT) { 1824 if (!cmd) 1825 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 1826 (unsigned char *)hdr); 1827 1828 spin_lock_bh(&conn->cmd_lock); 1829 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 1830 spin_unlock_bh(&conn->cmd_lock); 1831 1832 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 1833 1834 if (hdr->opcode & ISCSI_OP_IMMEDIATE) { 1835 iscsit_add_cmd_to_response_queue(cmd, conn, 1836 cmd->i_state); 1837 return 0; 1838 } 1839 1840 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 1841 (unsigned char *)hdr, hdr->cmdsn); 1842 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 1843 return 0; 1844 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 1845 return -1; 1846 1847 return 0; 1848 } 1849 /* 1850 * This was a response to a unsolicited NOPIN ping. 1851 */ 1852 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 1853 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt)); 1854 if (!cmd_p) 1855 return -EINVAL; 1856 1857 iscsit_stop_nopin_response_timer(conn); 1858 1859 cmd_p->i_state = ISTATE_REMOVE; 1860 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state); 1861 1862 iscsit_start_nopin_timer(conn); 1863 return 0; 1864 } 1865 /* 1866 * Otherwise, initiator is not expecting a NOPIN is response. 1867 * Just ignore for now. 1868 */ 1869 1870 if (cmd) 1871 iscsit_free_cmd(cmd, false); 1872 1873 return 0; 1874 } 1875 EXPORT_SYMBOL(iscsit_process_nop_out); 1876 iscsit_handle_nop_out(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)1877 static int iscsit_handle_nop_out(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 1878 unsigned char *buf) 1879 { 1880 unsigned char *ping_data = NULL; 1881 struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf; 1882 struct kvec *iov = NULL; 1883 u32 payload_length = ntoh24(hdr->dlength); 1884 int ret; 1885 1886 ret = iscsit_setup_nop_out(conn, cmd, hdr); 1887 if (ret < 0) 1888 return 0; 1889 /* 1890 * Handle NOP-OUT payload for traditional iSCSI sockets 1891 */ 1892 if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 1893 u32 checksum, data_crc, padding = 0; 1894 int niov = 0, rx_got, rx_size = payload_length; 1895 1896 ping_data = kzalloc(payload_length + 1, GFP_KERNEL); 1897 if (!ping_data) { 1898 ret = -1; 1899 goto out; 1900 } 1901 1902 iov = &cmd->iov_misc[0]; 1903 iov[niov].iov_base = ping_data; 1904 iov[niov++].iov_len = payload_length; 1905 1906 padding = ((-payload_length) & 3); 1907 if (padding != 0) { 1908 pr_debug("Receiving %u additional bytes" 1909 " for padding.\n", padding); 1910 iov[niov].iov_base = &cmd->pad_bytes; 1911 iov[niov++].iov_len = padding; 1912 rx_size += padding; 1913 } 1914 if (conn->conn_ops->DataDigest) { 1915 iov[niov].iov_base = &checksum; 1916 iov[niov++].iov_len = ISCSI_CRC_LEN; 1917 rx_size += ISCSI_CRC_LEN; 1918 } 1919 1920 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc)); 1921 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size); 1922 if (rx_got != rx_size) { 1923 ret = -1; 1924 goto out; 1925 } 1926 1927 if (conn->conn_ops->DataDigest) { 1928 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data, 1929 payload_length, padding, 1930 cmd->pad_bytes, &data_crc); 1931 1932 if (checksum != data_crc) { 1933 pr_err("Ping data CRC32C DataDigest" 1934 " 0x%08x does not match computed 0x%08x\n", 1935 checksum, data_crc); 1936 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 1937 pr_err("Unable to recover from" 1938 " NOPOUT Ping DataCRC failure while in" 1939 " ERL=0.\n"); 1940 ret = -1; 1941 goto out; 1942 } else { 1943 /* 1944 * Silently drop this PDU and let the 1945 * initiator plug the CmdSN gap. 1946 */ 1947 pr_debug("Dropping NOPOUT" 1948 " Command CmdSN: 0x%08x due to" 1949 " DataCRC error.\n", hdr->cmdsn); 1950 ret = 0; 1951 goto out; 1952 } 1953 } else { 1954 pr_debug("Got CRC32C DataDigest" 1955 " 0x%08x for %u bytes of ping data.\n", 1956 checksum, payload_length); 1957 } 1958 } 1959 1960 ping_data[payload_length] = '\0'; 1961 /* 1962 * Attach ping data to struct iscsit_cmd->buf_ptr. 1963 */ 1964 cmd->buf_ptr = ping_data; 1965 cmd->buf_ptr_size = payload_length; 1966 1967 pr_debug("Got %u bytes of NOPOUT ping" 1968 " data.\n", payload_length); 1969 pr_debug("Ping Data: \"%s\"\n", ping_data); 1970 } 1971 1972 return iscsit_process_nop_out(conn, cmd, hdr); 1973 out: 1974 if (cmd) 1975 iscsit_free_cmd(cmd, false); 1976 1977 kfree(ping_data); 1978 return ret; 1979 } 1980 iscsit_convert_tmf(u8 iscsi_tmf)1981 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf) 1982 { 1983 switch (iscsi_tmf) { 1984 case ISCSI_TM_FUNC_ABORT_TASK: 1985 return TMR_ABORT_TASK; 1986 case ISCSI_TM_FUNC_ABORT_TASK_SET: 1987 return TMR_ABORT_TASK_SET; 1988 case ISCSI_TM_FUNC_CLEAR_ACA: 1989 return TMR_CLEAR_ACA; 1990 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 1991 return TMR_CLEAR_TASK_SET; 1992 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 1993 return TMR_LUN_RESET; 1994 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 1995 return TMR_TARGET_WARM_RESET; 1996 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 1997 return TMR_TARGET_COLD_RESET; 1998 default: 1999 return TMR_UNKNOWN; 2000 } 2001 } 2002 2003 int iscsit_handle_task_mgt_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2004 iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2005 unsigned char *buf) 2006 { 2007 struct se_tmr_req *se_tmr; 2008 struct iscsi_tmr_req *tmr_req; 2009 struct iscsi_tm *hdr; 2010 int out_of_order_cmdsn = 0, ret; 2011 u8 function, tcm_function = TMR_UNKNOWN; 2012 2013 hdr = (struct iscsi_tm *) buf; 2014 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2015 function = hdr->flags; 2016 2017 pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:" 2018 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:" 2019 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function, 2020 hdr->rtt, hdr->refcmdsn, conn->cid); 2021 2022 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2023 ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2024 hdr->rtt != RESERVED_ITT)) { 2025 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n"); 2026 hdr->rtt = RESERVED_ITT; 2027 } 2028 2029 if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) && 2030 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2031 pr_err("Task Management Request TASK_REASSIGN not" 2032 " issued as immediate command, bad iSCSI Initiator" 2033 "implementation\n"); 2034 return iscsit_add_reject_cmd(cmd, 2035 ISCSI_REASON_PROTOCOL_ERROR, buf); 2036 } 2037 if ((function != ISCSI_TM_FUNC_ABORT_TASK) && 2038 be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG) 2039 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG); 2040 2041 cmd->data_direction = DMA_NONE; 2042 cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL); 2043 if (!cmd->tmr_req) { 2044 return iscsit_add_reject_cmd(cmd, 2045 ISCSI_REASON_BOOKMARK_NO_RESOURCES, 2046 buf); 2047 } 2048 2049 __target_init_cmd(&cmd->se_cmd, &iscsi_ops, 2050 conn->sess->se_sess, 0, DMA_NONE, 2051 TCM_SIMPLE_TAG, cmd->sense_buffer + 2, 2052 scsilun_to_int(&hdr->lun), 2053 conn->cmd_cnt); 2054 2055 target_get_sess_cmd(&cmd->se_cmd, true); 2056 2057 /* 2058 * TASK_REASSIGN for ERL=2 / connection stays inside of 2059 * LIO-Target $FABRIC_MOD 2060 */ 2061 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2062 tcm_function = iscsit_convert_tmf(function); 2063 if (tcm_function == TMR_UNKNOWN) { 2064 pr_err("Unknown iSCSI TMR Function:" 2065 " 0x%02x\n", function); 2066 return iscsit_add_reject_cmd(cmd, 2067 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2068 } 2069 } 2070 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function, 2071 GFP_KERNEL); 2072 if (ret < 0) 2073 return iscsit_add_reject_cmd(cmd, 2074 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 2075 2076 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req; 2077 2078 cmd->iscsi_opcode = ISCSI_OP_SCSI_TMFUNC; 2079 cmd->i_state = ISTATE_SEND_TASKMGTRSP; 2080 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2081 cmd->init_task_tag = hdr->itt; 2082 cmd->targ_xfer_tag = 0xFFFFFFFF; 2083 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2084 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2085 se_tmr = cmd->se_cmd.se_tmr_req; 2086 tmr_req = cmd->tmr_req; 2087 /* 2088 * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN 2089 */ 2090 if (function != ISCSI_TM_FUNC_TASK_REASSIGN) { 2091 ret = transport_lookup_tmr_lun(&cmd->se_cmd); 2092 if (ret < 0) { 2093 se_tmr->response = ISCSI_TMF_RSP_NO_LUN; 2094 goto attach; 2095 } 2096 } 2097 2098 switch (function) { 2099 case ISCSI_TM_FUNC_ABORT_TASK: 2100 se_tmr->response = iscsit_tmr_abort_task(cmd, buf); 2101 if (se_tmr->response) 2102 goto attach; 2103 break; 2104 case ISCSI_TM_FUNC_ABORT_TASK_SET: 2105 case ISCSI_TM_FUNC_CLEAR_ACA: 2106 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 2107 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 2108 break; 2109 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 2110 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) { 2111 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2112 goto attach; 2113 } 2114 break; 2115 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 2116 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) { 2117 se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED; 2118 goto attach; 2119 } 2120 break; 2121 case ISCSI_TM_FUNC_TASK_REASSIGN: 2122 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf); 2123 /* 2124 * Perform sanity checks on the ExpDataSN only if the 2125 * TASK_REASSIGN was successful. 2126 */ 2127 if (se_tmr->response) 2128 break; 2129 2130 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0) 2131 return iscsit_add_reject_cmd(cmd, 2132 ISCSI_REASON_BOOKMARK_INVALID, buf); 2133 break; 2134 default: 2135 pr_err("Unknown TMR function: 0x%02x, protocol" 2136 " error.\n", function); 2137 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED; 2138 goto attach; 2139 } 2140 2141 if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) && 2142 (se_tmr->response == ISCSI_TMF_RSP_COMPLETE)) 2143 se_tmr->call_transport = 1; 2144 attach: 2145 spin_lock_bh(&conn->cmd_lock); 2146 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2147 spin_unlock_bh(&conn->cmd_lock); 2148 2149 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2150 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2151 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) { 2152 out_of_order_cmdsn = 1; 2153 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) { 2154 target_put_sess_cmd(&cmd->se_cmd); 2155 return 0; 2156 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) { 2157 return -1; 2158 } 2159 } 2160 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2161 2162 if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 2163 return 0; 2164 /* 2165 * Found the referenced task, send to transport for processing. 2166 */ 2167 if (se_tmr->call_transport) 2168 return transport_generic_handle_tmr(&cmd->se_cmd); 2169 2170 /* 2171 * Could not find the referenced LUN, task, or Task Management 2172 * command not authorized or supported. Change state and 2173 * let the tx_thread send the response. 2174 * 2175 * For connection recovery, this is also the default action for 2176 * TMR TASK_REASSIGN. 2177 */ 2178 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2179 target_put_sess_cmd(&cmd->se_cmd); 2180 return 0; 2181 } 2182 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd); 2183 2184 /* #warning FIXME: Support Text Command parameters besides SendTargets */ 2185 int iscsit_setup_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2186 iscsit_setup_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2187 struct iscsi_text *hdr) 2188 { 2189 u32 payload_length = ntoh24(hdr->dlength); 2190 2191 if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { 2192 pr_err("Unable to accept text parameter length: %u" 2193 "greater than MaxXmitDataSegmentLength %u.\n", 2194 payload_length, conn->conn_ops->MaxXmitDataSegmentLength); 2195 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2196 (unsigned char *)hdr); 2197 } 2198 2199 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) || 2200 (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) { 2201 pr_err("Multi sequence text commands currently not supported\n"); 2202 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED, 2203 (unsigned char *)hdr); 2204 } 2205 2206 pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x," 2207 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn, 2208 hdr->exp_statsn, payload_length); 2209 2210 cmd->iscsi_opcode = ISCSI_OP_TEXT; 2211 cmd->i_state = ISTATE_SEND_TEXTRSP; 2212 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2213 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2214 cmd->targ_xfer_tag = 0xFFFFFFFF; 2215 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2216 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2217 cmd->data_direction = DMA_NONE; 2218 kfree(cmd->text_in_ptr); 2219 cmd->text_in_ptr = NULL; 2220 2221 return 0; 2222 } 2223 EXPORT_SYMBOL(iscsit_setup_text_cmd); 2224 2225 int iscsit_process_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,struct iscsi_text * hdr)2226 iscsit_process_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2227 struct iscsi_text *hdr) 2228 { 2229 unsigned char *text_in = cmd->text_in_ptr, *text_ptr; 2230 int cmdsn_ret; 2231 2232 if (!text_in) { 2233 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); 2234 if (cmd->targ_xfer_tag == 0xFFFFFFFF) { 2235 pr_err("Unable to locate text_in buffer for sendtargets" 2236 " discovery\n"); 2237 goto reject; 2238 } 2239 goto empty_sendtargets; 2240 } 2241 if (strncmp("SendTargets=", text_in, 12) != 0) { 2242 pr_err("Received Text Data that is not" 2243 " SendTargets, cannot continue.\n"); 2244 goto reject; 2245 } 2246 /* '=' confirmed in strncmp */ 2247 text_ptr = strchr(text_in, '='); 2248 BUG_ON(!text_ptr); 2249 if (!strncmp("=All", text_ptr, 5)) { 2250 cmd->cmd_flags |= ICF_SENDTARGETS_ALL; 2251 } else if (!strncmp("=iqn.", text_ptr, 5) || 2252 !strncmp("=eui.", text_ptr, 5)) { 2253 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE; 2254 } else { 2255 pr_err("Unable to locate valid SendTargets%s value\n", 2256 text_ptr); 2257 goto reject; 2258 } 2259 2260 spin_lock_bh(&conn->cmd_lock); 2261 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2262 spin_unlock_bh(&conn->cmd_lock); 2263 2264 empty_sendtargets: 2265 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2266 2267 if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 2268 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, 2269 (unsigned char *)hdr, hdr->cmdsn); 2270 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2271 return -1; 2272 2273 return 0; 2274 } 2275 2276 return iscsit_execute_cmd(cmd, 0); 2277 2278 reject: 2279 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, 2280 (unsigned char *)hdr); 2281 } 2282 EXPORT_SYMBOL(iscsit_process_text_cmd); 2283 2284 static int iscsit_handle_text_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2285 iscsit_handle_text_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2286 unsigned char *buf) 2287 { 2288 struct iscsi_text *hdr = (struct iscsi_text *)buf; 2289 char *text_in = NULL; 2290 u32 payload_length = ntoh24(hdr->dlength); 2291 int rx_size, rc; 2292 2293 rc = iscsit_setup_text_cmd(conn, cmd, hdr); 2294 if (rc < 0) 2295 return 0; 2296 2297 rx_size = payload_length; 2298 if (payload_length) { 2299 u32 checksum = 0, data_crc = 0; 2300 u32 padding = 0; 2301 int niov = 0, rx_got; 2302 struct kvec iov[2]; 2303 2304 rx_size = ALIGN(payload_length, 4); 2305 text_in = kzalloc(rx_size, GFP_KERNEL); 2306 if (!text_in) 2307 goto reject; 2308 2309 cmd->text_in_ptr = text_in; 2310 2311 memset(iov, 0, sizeof(iov)); 2312 iov[niov].iov_base = text_in; 2313 iov[niov++].iov_len = rx_size; 2314 2315 padding = rx_size - payload_length; 2316 if (padding) 2317 pr_debug("Receiving %u additional bytes" 2318 " for padding.\n", padding); 2319 if (conn->conn_ops->DataDigest) { 2320 iov[niov].iov_base = &checksum; 2321 iov[niov++].iov_len = ISCSI_CRC_LEN; 2322 rx_size += ISCSI_CRC_LEN; 2323 } 2324 2325 WARN_ON_ONCE(niov > ARRAY_SIZE(iov)); 2326 rx_got = rx_data(conn, &iov[0], niov, rx_size); 2327 if (rx_got != rx_size) 2328 goto reject; 2329 2330 if (conn->conn_ops->DataDigest) { 2331 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, 2332 text_in, rx_size, 0, NULL, 2333 &data_crc); 2334 2335 if (checksum != data_crc) { 2336 pr_err("Text data CRC32C DataDigest" 2337 " 0x%08x does not match computed" 2338 " 0x%08x\n", checksum, data_crc); 2339 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2340 pr_err("Unable to recover from" 2341 " Text Data digest failure while in" 2342 " ERL=0.\n"); 2343 goto reject; 2344 } else { 2345 /* 2346 * Silently drop this PDU and let the 2347 * initiator plug the CmdSN gap. 2348 */ 2349 pr_debug("Dropping Text" 2350 " Command CmdSN: 0x%08x due to" 2351 " DataCRC error.\n", hdr->cmdsn); 2352 kfree(text_in); 2353 return 0; 2354 } 2355 } else { 2356 pr_debug("Got CRC32C DataDigest" 2357 " 0x%08x for %u bytes of text data.\n", 2358 checksum, payload_length); 2359 } 2360 } 2361 text_in[payload_length - 1] = '\0'; 2362 pr_debug("Successfully read %d bytes of text" 2363 " data.\n", payload_length); 2364 } 2365 2366 return iscsit_process_text_cmd(conn, cmd, hdr); 2367 2368 reject: 2369 kfree(cmd->text_in_ptr); 2370 cmd->text_in_ptr = NULL; 2371 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 2372 } 2373 iscsit_logout_closesession(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2374 int iscsit_logout_closesession(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2375 { 2376 struct iscsit_conn *conn_p; 2377 struct iscsit_session *sess = conn->sess; 2378 2379 pr_debug("Received logout request CLOSESESSION on CID: %hu" 2380 " for SID: %u.\n", conn->cid, conn->sess->sid); 2381 2382 atomic_set(&sess->session_logout, 1); 2383 atomic_set(&conn->conn_logout_remove, 1); 2384 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION; 2385 2386 iscsit_inc_conn_usage_count(conn); 2387 iscsit_inc_session_usage_count(sess); 2388 2389 spin_lock_bh(&sess->conn_lock); 2390 list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) { 2391 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN) 2392 continue; 2393 2394 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2395 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2396 } 2397 spin_unlock_bh(&sess->conn_lock); 2398 2399 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2400 2401 return 0; 2402 } 2403 iscsit_logout_closeconnection(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2404 int iscsit_logout_closeconnection(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2405 { 2406 struct iscsit_conn *l_conn; 2407 struct iscsit_session *sess = conn->sess; 2408 2409 pr_debug("Received logout request CLOSECONNECTION for CID:" 2410 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2411 2412 /* 2413 * A Logout Request with a CLOSECONNECTION reason code for a CID 2414 * can arrive on a connection with a differing CID. 2415 */ 2416 if (conn->cid == cmd->logout_cid) { 2417 spin_lock_bh(&conn->state_lock); 2418 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 2419 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 2420 2421 atomic_set(&conn->conn_logout_remove, 1); 2422 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION; 2423 iscsit_inc_conn_usage_count(conn); 2424 2425 spin_unlock_bh(&conn->state_lock); 2426 } else { 2427 /* 2428 * Handle all different cid CLOSECONNECTION requests in 2429 * iscsit_logout_post_handler_diffcid() as to give enough 2430 * time for any non immediate command's CmdSN to be 2431 * acknowledged on the connection in question. 2432 * 2433 * Here we simply make sure the CID is still around. 2434 */ 2435 l_conn = iscsit_get_conn_from_cid(sess, 2436 cmd->logout_cid); 2437 if (!l_conn) { 2438 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2439 iscsit_add_cmd_to_response_queue(cmd, conn, 2440 cmd->i_state); 2441 return 0; 2442 } 2443 2444 iscsit_dec_conn_usage_count(l_conn); 2445 } 2446 2447 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2448 2449 return 0; 2450 } 2451 iscsit_logout_removeconnforrecovery(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2452 int iscsit_logout_removeconnforrecovery(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2453 { 2454 struct iscsit_session *sess = conn->sess; 2455 2456 pr_debug("Received explicit REMOVECONNFORRECOVERY logout for" 2457 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid); 2458 2459 if (sess->sess_ops->ErrorRecoveryLevel != 2) { 2460 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2461 " while ERL!=2.\n"); 2462 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED; 2463 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2464 return 0; 2465 } 2466 2467 if (conn->cid == cmd->logout_cid) { 2468 pr_err("Received Logout Request REMOVECONNFORRECOVERY" 2469 " with CID: %hu on CID: %hu, implementation error.\n", 2470 cmd->logout_cid, conn->cid); 2471 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED; 2472 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2473 return 0; 2474 } 2475 2476 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 2477 2478 return 0; 2479 } 2480 2481 int iscsit_handle_logout_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,unsigned char * buf)2482 iscsit_handle_logout_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 2483 unsigned char *buf) 2484 { 2485 int cmdsn_ret, logout_remove = 0; 2486 u8 reason_code = 0; 2487 struct iscsi_logout *hdr; 2488 struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn); 2489 2490 hdr = (struct iscsi_logout *) buf; 2491 reason_code = (hdr->flags & 0x7f); 2492 2493 if (tiqn) { 2494 spin_lock(&tiqn->logout_stats.lock); 2495 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) 2496 tiqn->logout_stats.normal_logouts++; 2497 else 2498 tiqn->logout_stats.abnormal_logouts++; 2499 spin_unlock(&tiqn->logout_stats.lock); 2500 } 2501 2502 pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x" 2503 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n", 2504 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code, 2505 hdr->cid, conn->cid); 2506 2507 if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) { 2508 pr_err("Received logout request on connection that" 2509 " is not in logged in state, ignoring request.\n"); 2510 iscsit_free_cmd(cmd, false); 2511 return 0; 2512 } 2513 2514 cmd->iscsi_opcode = ISCSI_OP_LOGOUT; 2515 cmd->i_state = ISTATE_SEND_LOGOUTRSP; 2516 cmd->immediate_cmd = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0); 2517 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt; 2518 cmd->targ_xfer_tag = 0xFFFFFFFF; 2519 cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); 2520 cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); 2521 cmd->logout_cid = be16_to_cpu(hdr->cid); 2522 cmd->logout_reason = reason_code; 2523 cmd->data_direction = DMA_NONE; 2524 2525 /* 2526 * We need to sleep in these cases (by returning 1) until the Logout 2527 * Response gets sent in the tx thread. 2528 */ 2529 if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) || 2530 ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) && 2531 be16_to_cpu(hdr->cid) == conn->cid)) 2532 logout_remove = 1; 2533 2534 spin_lock_bh(&conn->cmd_lock); 2535 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 2536 spin_unlock_bh(&conn->cmd_lock); 2537 2538 if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY) 2539 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); 2540 2541 /* 2542 * Immediate commands are executed, well, immediately. 2543 * Non-Immediate Logout Commands are executed in CmdSN order. 2544 */ 2545 if (cmd->immediate_cmd) { 2546 int ret = iscsit_execute_cmd(cmd, 0); 2547 2548 if (ret < 0) 2549 return ret; 2550 } else { 2551 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn); 2552 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) 2553 logout_remove = 0; 2554 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) 2555 return -1; 2556 } 2557 2558 return logout_remove; 2559 } 2560 EXPORT_SYMBOL(iscsit_handle_logout_cmd); 2561 iscsit_handle_snack(struct iscsit_conn * conn,unsigned char * buf)2562 int iscsit_handle_snack( 2563 struct iscsit_conn *conn, 2564 unsigned char *buf) 2565 { 2566 struct iscsi_snack *hdr; 2567 2568 hdr = (struct iscsi_snack *) buf; 2569 hdr->flags &= ~ISCSI_FLAG_CMD_FINAL; 2570 2571 pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:" 2572 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x," 2573 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags, 2574 hdr->begrun, hdr->runlength, conn->cid); 2575 2576 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2577 pr_err("Initiator sent SNACK request while in" 2578 " ErrorRecoveryLevel=0.\n"); 2579 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2580 buf); 2581 } 2582 /* 2583 * SNACK_DATA and SNACK_R2T are both 0, so check which function to 2584 * call from inside iscsi_send_recovery_datain_or_r2t(). 2585 */ 2586 switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) { 2587 case 0: 2588 return iscsit_handle_recovery_datain_or_r2t(conn, buf, 2589 hdr->itt, 2590 be32_to_cpu(hdr->ttt), 2591 be32_to_cpu(hdr->begrun), 2592 be32_to_cpu(hdr->runlength)); 2593 case ISCSI_FLAG_SNACK_TYPE_STATUS: 2594 return iscsit_handle_status_snack(conn, hdr->itt, 2595 be32_to_cpu(hdr->ttt), 2596 be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength)); 2597 case ISCSI_FLAG_SNACK_TYPE_DATA_ACK: 2598 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt), 2599 be32_to_cpu(hdr->begrun), 2600 be32_to_cpu(hdr->runlength)); 2601 case ISCSI_FLAG_SNACK_TYPE_RDATA: 2602 /* FIXME: Support R-Data SNACK */ 2603 pr_err("R-Data SNACK Not Supported.\n"); 2604 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2605 buf); 2606 default: 2607 pr_err("Unknown SNACK type 0x%02x, protocol" 2608 " error.\n", hdr->flags & 0x0f); 2609 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 2610 buf); 2611 } 2612 2613 return 0; 2614 } 2615 EXPORT_SYMBOL(iscsit_handle_snack); 2616 iscsit_rx_thread_wait_for_tcp(struct iscsit_conn * conn)2617 static void iscsit_rx_thread_wait_for_tcp(struct iscsit_conn *conn) 2618 { 2619 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2620 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2621 wait_for_completion_interruptible_timeout( 2622 &conn->rx_half_close_comp, 2623 ISCSI_RX_THREAD_TCP_TIMEOUT * HZ); 2624 } 2625 } 2626 iscsit_handle_immediate_data(struct iscsit_cmd * cmd,struct iscsi_scsi_req * hdr,u32 length)2627 static int iscsit_handle_immediate_data( 2628 struct iscsit_cmd *cmd, 2629 struct iscsi_scsi_req *hdr, 2630 u32 length) 2631 { 2632 int iov_ret, rx_got = 0, rx_size = 0; 2633 u32 checksum, iov_count = 0, padding = 0; 2634 struct iscsit_conn *conn = cmd->conn; 2635 struct kvec *iov; 2636 void *overflow_buf = NULL; 2637 2638 BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length); 2639 rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length); 2640 iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, 2641 cmd->orig_iov_data_count - 2, 2642 cmd->write_data_done, rx_size); 2643 if (iov_ret < 0) 2644 return IMMEDIATE_DATA_CANNOT_RECOVER; 2645 2646 iov_count = iov_ret; 2647 iov = &cmd->iov_data[0]; 2648 if (rx_size < length) { 2649 /* 2650 * Special case: length of immediate data exceeds the data 2651 * buffer size derived from the CDB. 2652 */ 2653 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL); 2654 if (!overflow_buf) { 2655 iscsit_unmap_iovec(cmd); 2656 return IMMEDIATE_DATA_CANNOT_RECOVER; 2657 } 2658 cmd->overflow_buf = overflow_buf; 2659 iov[iov_count].iov_base = overflow_buf; 2660 iov[iov_count].iov_len = length - rx_size; 2661 iov_count++; 2662 rx_size = length; 2663 } 2664 2665 padding = ((-length) & 3); 2666 if (padding != 0) { 2667 iov[iov_count].iov_base = cmd->pad_bytes; 2668 iov[iov_count++].iov_len = padding; 2669 rx_size += padding; 2670 } 2671 2672 if (conn->conn_ops->DataDigest) { 2673 iov[iov_count].iov_base = &checksum; 2674 iov[iov_count++].iov_len = ISCSI_CRC_LEN; 2675 rx_size += ISCSI_CRC_LEN; 2676 } 2677 2678 WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count); 2679 rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size); 2680 2681 iscsit_unmap_iovec(cmd); 2682 2683 if (rx_got != rx_size) { 2684 iscsit_rx_thread_wait_for_tcp(conn); 2685 return IMMEDIATE_DATA_CANNOT_RECOVER; 2686 } 2687 2688 if (conn->conn_ops->DataDigest) { 2689 u32 data_crc; 2690 2691 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd, 2692 cmd->write_data_done, length, padding, 2693 cmd->pad_bytes); 2694 2695 if (checksum != data_crc) { 2696 pr_err("ImmediateData CRC32C DataDigest 0x%08x" 2697 " does not match computed 0x%08x\n", checksum, 2698 data_crc); 2699 2700 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 2701 pr_err("Unable to recover from" 2702 " Immediate Data digest failure while" 2703 " in ERL=0.\n"); 2704 iscsit_reject_cmd(cmd, 2705 ISCSI_REASON_DATA_DIGEST_ERROR, 2706 (unsigned char *)hdr); 2707 return IMMEDIATE_DATA_CANNOT_RECOVER; 2708 } else { 2709 iscsit_reject_cmd(cmd, 2710 ISCSI_REASON_DATA_DIGEST_ERROR, 2711 (unsigned char *)hdr); 2712 return IMMEDIATE_DATA_ERL1_CRC_FAILURE; 2713 } 2714 } else { 2715 pr_debug("Got CRC32C DataDigest 0x%08x for" 2716 " %u bytes of Immediate Data\n", checksum, 2717 length); 2718 } 2719 } 2720 2721 cmd->write_data_done += length; 2722 2723 if (cmd->write_data_done == cmd->se_cmd.data_length) { 2724 spin_lock_bh(&cmd->istate_lock); 2725 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT; 2726 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT; 2727 spin_unlock_bh(&cmd->istate_lock); 2728 } 2729 2730 return IMMEDIATE_DATA_NORMAL_OPERATION; 2731 } 2732 2733 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections 2734 with active network interface */ iscsit_build_conn_drop_async_message(struct iscsit_conn * conn)2735 static void iscsit_build_conn_drop_async_message(struct iscsit_conn *conn) 2736 { 2737 struct iscsit_cmd *cmd; 2738 struct iscsit_conn *conn_p; 2739 bool found = false; 2740 2741 lockdep_assert_held(&conn->sess->conn_lock); 2742 2743 /* 2744 * Only send a Asynchronous Message on connections whos network 2745 * interface is still functional. 2746 */ 2747 list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) { 2748 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) { 2749 iscsit_inc_conn_usage_count(conn_p); 2750 found = true; 2751 break; 2752 } 2753 } 2754 2755 if (!found) 2756 return; 2757 2758 cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING); 2759 if (!cmd) { 2760 iscsit_dec_conn_usage_count(conn_p); 2761 return; 2762 } 2763 2764 cmd->logout_cid = conn->cid; 2765 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2766 cmd->i_state = ISTATE_SEND_ASYNCMSG; 2767 2768 spin_lock_bh(&conn_p->cmd_lock); 2769 list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list); 2770 spin_unlock_bh(&conn_p->cmd_lock); 2771 2772 iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state); 2773 iscsit_dec_conn_usage_count(conn_p); 2774 } 2775 iscsit_send_conn_drop_async_message(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2776 static int iscsit_send_conn_drop_async_message( 2777 struct iscsit_cmd *cmd, 2778 struct iscsit_conn *conn) 2779 { 2780 struct iscsi_async *hdr; 2781 2782 cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT; 2783 2784 hdr = (struct iscsi_async *) cmd->pdu; 2785 hdr->opcode = ISCSI_OP_ASYNC_EVENT; 2786 hdr->flags = ISCSI_FLAG_CMD_FINAL; 2787 cmd->init_task_tag = RESERVED_ITT; 2788 cmd->targ_xfer_tag = 0xFFFFFFFF; 2789 put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]); 2790 cmd->stat_sn = conn->stat_sn++; 2791 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2792 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2793 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2794 hdr->async_event = ISCSI_ASYNC_MSG_DROPPING_CONNECTION; 2795 hdr->param1 = cpu_to_be16(cmd->logout_cid); 2796 hdr->param2 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait); 2797 hdr->param3 = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain); 2798 2799 pr_debug("Sending Connection Dropped Async Message StatSN:" 2800 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn, 2801 cmd->logout_cid, conn->cid); 2802 2803 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 2804 } 2805 iscsit_tx_thread_wait_for_tcp(struct iscsit_conn * conn)2806 static void iscsit_tx_thread_wait_for_tcp(struct iscsit_conn *conn) 2807 { 2808 if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) || 2809 (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) { 2810 wait_for_completion_interruptible_timeout( 2811 &conn->tx_half_close_comp, 2812 ISCSI_TX_THREAD_TCP_TIMEOUT * HZ); 2813 } 2814 } 2815 2816 void iscsit_build_datain_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_datain * datain,struct iscsi_data_rsp * hdr,bool set_statsn)2817 iscsit_build_datain_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2818 struct iscsi_datain *datain, struct iscsi_data_rsp *hdr, 2819 bool set_statsn) 2820 { 2821 hdr->opcode = ISCSI_OP_SCSI_DATA_IN; 2822 hdr->flags = datain->flags; 2823 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 2824 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 2825 hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW; 2826 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2827 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 2828 hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW; 2829 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 2830 } 2831 } 2832 hton24(hdr->dlength, datain->length); 2833 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2834 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 2835 (struct scsi_lun *)&hdr->lun); 2836 else 2837 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 2838 2839 hdr->itt = cmd->init_task_tag; 2840 2841 if (hdr->flags & ISCSI_FLAG_DATA_ACK) 2842 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 2843 else 2844 hdr->ttt = cpu_to_be32(0xFFFFFFFF); 2845 if (set_statsn) 2846 hdr->statsn = cpu_to_be32(cmd->stat_sn); 2847 else 2848 hdr->statsn = cpu_to_be32(0xFFFFFFFF); 2849 2850 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 2851 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 2852 hdr->datasn = cpu_to_be32(datain->data_sn); 2853 hdr->offset = cpu_to_be32(datain->offset); 2854 2855 pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x," 2856 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n", 2857 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn), 2858 ntohl(hdr->offset), datain->length, conn->cid); 2859 } 2860 EXPORT_SYMBOL(iscsit_build_datain_pdu); 2861 iscsit_send_datain(struct iscsit_cmd * cmd,struct iscsit_conn * conn)2862 static int iscsit_send_datain(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 2863 { 2864 struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0]; 2865 struct iscsi_datain datain; 2866 struct iscsi_datain_req *dr; 2867 int eodr = 0, ret; 2868 bool set_statsn = false; 2869 2870 memset(&datain, 0, sizeof(struct iscsi_datain)); 2871 dr = iscsit_get_datain_values(cmd, &datain); 2872 if (!dr) { 2873 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n", 2874 cmd->init_task_tag); 2875 return -1; 2876 } 2877 /* 2878 * Be paranoid and double check the logic for now. 2879 */ 2880 if ((datain.offset + datain.length) > cmd->se_cmd.data_length) { 2881 pr_err("Command ITT: 0x%08x, datain.offset: %u and" 2882 " datain.length: %u exceeds cmd->data_length: %u\n", 2883 cmd->init_task_tag, datain.offset, datain.length, 2884 cmd->se_cmd.data_length); 2885 return -1; 2886 } 2887 2888 atomic_long_add(datain.length, &conn->sess->tx_data_octets); 2889 /* 2890 * Special case for successfully execution w/ both DATAIN 2891 * and Sense Data. 2892 */ 2893 if ((datain.flags & ISCSI_FLAG_DATA_STATUS) && 2894 (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)) 2895 datain.flags &= ~ISCSI_FLAG_DATA_STATUS; 2896 else { 2897 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) || 2898 (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) { 2899 iscsit_increment_maxcmdsn(cmd, conn->sess); 2900 cmd->stat_sn = conn->stat_sn++; 2901 set_statsn = true; 2902 } else if (dr->dr_complete == 2903 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY) 2904 set_statsn = true; 2905 } 2906 2907 iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn); 2908 2909 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0); 2910 if (ret < 0) 2911 return ret; 2912 2913 if (dr->dr_complete) { 2914 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ? 2915 2 : 1; 2916 iscsit_free_datain_req(cmd, dr); 2917 } 2918 2919 return eodr; 2920 } 2921 2922 int iscsit_build_logout_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_logout_rsp * hdr)2923 iscsit_build_logout_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 2924 struct iscsi_logout_rsp *hdr) 2925 { 2926 struct iscsit_conn *logout_conn = NULL; 2927 struct iscsi_conn_recovery *cr = NULL; 2928 struct iscsit_session *sess = conn->sess; 2929 /* 2930 * The actual shutting down of Sessions and/or Connections 2931 * for CLOSESESSION and CLOSECONNECTION Logout Requests 2932 * is done in scsi_logout_post_handler(). 2933 */ 2934 switch (cmd->logout_reason) { 2935 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 2936 pr_debug("iSCSI session logout successful, setting" 2937 " logout response to ISCSI_LOGOUT_SUCCESS.\n"); 2938 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2939 break; 2940 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 2941 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND) 2942 break; 2943 /* 2944 * For CLOSECONNECTION logout requests carrying 2945 * a matching logout CID -> local CID, the reference 2946 * for the local CID will have been incremented in 2947 * iscsi_logout_closeconnection(). 2948 * 2949 * For CLOSECONNECTION logout requests carrying 2950 * a different CID than the connection it arrived 2951 * on, the connection responding to cmd->logout_cid 2952 * is stopped in iscsit_logout_post_handler_diffcid(). 2953 */ 2954 2955 pr_debug("iSCSI CID: %hu logout on CID: %hu" 2956 " successful.\n", cmd->logout_cid, conn->cid); 2957 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2958 break; 2959 case ISCSI_LOGOUT_REASON_RECOVERY: 2960 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) || 2961 (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED)) 2962 break; 2963 /* 2964 * If the connection is still active from our point of view 2965 * force connection recovery to occur. 2966 */ 2967 logout_conn = iscsit_get_conn_from_cid_rcfr(sess, 2968 cmd->logout_cid); 2969 if (logout_conn) { 2970 iscsit_connection_reinstatement_rcfr(logout_conn); 2971 iscsit_dec_conn_usage_count(logout_conn); 2972 } 2973 2974 cr = iscsit_get_inactive_connection_recovery_entry( 2975 conn->sess, cmd->logout_cid); 2976 if (!cr) { 2977 pr_err("Unable to locate CID: %hu for" 2978 " REMOVECONNFORRECOVERY Logout Request.\n", 2979 cmd->logout_cid); 2980 cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND; 2981 break; 2982 } 2983 2984 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn); 2985 2986 pr_debug("iSCSI REMOVECONNFORRECOVERY logout" 2987 " for recovery for CID: %hu on CID: %hu successful.\n", 2988 cmd->logout_cid, conn->cid); 2989 cmd->logout_response = ISCSI_LOGOUT_SUCCESS; 2990 break; 2991 default: 2992 pr_err("Unknown cmd->logout_reason: 0x%02x\n", 2993 cmd->logout_reason); 2994 return -1; 2995 } 2996 2997 hdr->opcode = ISCSI_OP_LOGOUT_RSP; 2998 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2999 hdr->response = cmd->logout_response; 3000 hdr->itt = cmd->init_task_tag; 3001 cmd->stat_sn = conn->stat_sn++; 3002 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3003 3004 iscsit_increment_maxcmdsn(cmd, conn->sess); 3005 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3006 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3007 3008 pr_debug("Built Logout Response ITT: 0x%08x StatSN:" 3009 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n", 3010 cmd->init_task_tag, cmd->stat_sn, hdr->response, 3011 cmd->logout_cid, conn->cid); 3012 3013 return 0; 3014 } 3015 EXPORT_SYMBOL(iscsit_build_logout_rsp); 3016 3017 static int iscsit_send_logout(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3018 iscsit_send_logout(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3019 { 3020 int rc; 3021 3022 rc = iscsit_build_logout_rsp(cmd, conn, 3023 (struct iscsi_logout_rsp *)&cmd->pdu[0]); 3024 if (rc < 0) 3025 return rc; 3026 3027 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3028 } 3029 3030 void iscsit_build_nopin_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_nopin * hdr,bool nopout_response)3031 iscsit_build_nopin_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3032 struct iscsi_nopin *hdr, bool nopout_response) 3033 { 3034 hdr->opcode = ISCSI_OP_NOOP_IN; 3035 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3036 hton24(hdr->dlength, cmd->buf_ptr_size); 3037 if (nopout_response) 3038 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun); 3039 hdr->itt = cmd->init_task_tag; 3040 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3041 cmd->stat_sn = (nopout_response) ? conn->stat_sn++ : 3042 conn->stat_sn; 3043 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3044 3045 if (nopout_response) 3046 iscsit_increment_maxcmdsn(cmd, conn->sess); 3047 3048 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3049 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3050 3051 pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x," 3052 " StatSN: 0x%08x, Length %u\n", (nopout_response) ? 3053 "Solicited" : "Unsolicited", cmd->init_task_tag, 3054 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size); 3055 } 3056 EXPORT_SYMBOL(iscsit_build_nopin_rsp); 3057 3058 /* 3059 * Unsolicited NOPIN, either requesting a response or not. 3060 */ iscsit_send_unsolicited_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn,int want_response)3061 static int iscsit_send_unsolicited_nopin( 3062 struct iscsit_cmd *cmd, 3063 struct iscsit_conn *conn, 3064 int want_response) 3065 { 3066 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3067 int ret; 3068 3069 iscsit_build_nopin_rsp(cmd, conn, hdr, false); 3070 3071 pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:" 3072 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid); 3073 3074 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3075 if (ret < 0) 3076 return ret; 3077 3078 spin_lock_bh(&cmd->istate_lock); 3079 cmd->i_state = want_response ? 3080 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS; 3081 spin_unlock_bh(&cmd->istate_lock); 3082 3083 return 0; 3084 } 3085 3086 static int iscsit_send_nopin(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3087 iscsit_send_nopin(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3088 { 3089 struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0]; 3090 3091 iscsit_build_nopin_rsp(cmd, conn, hdr, true); 3092 3093 /* 3094 * NOPOUT Ping Data is attached to struct iscsit_cmd->buf_ptr. 3095 * NOPOUT DataSegmentLength is at struct iscsit_cmd->buf_ptr_size. 3096 */ 3097 pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size); 3098 3099 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3100 cmd->buf_ptr, 3101 cmd->buf_ptr_size); 3102 } 3103 iscsit_send_r2t(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3104 static int iscsit_send_r2t( 3105 struct iscsit_cmd *cmd, 3106 struct iscsit_conn *conn) 3107 { 3108 struct iscsi_r2t *r2t; 3109 struct iscsi_r2t_rsp *hdr; 3110 int ret; 3111 3112 r2t = iscsit_get_r2t_from_list(cmd); 3113 if (!r2t) 3114 return -1; 3115 3116 hdr = (struct iscsi_r2t_rsp *) cmd->pdu; 3117 memset(hdr, 0, ISCSI_HDR_LEN); 3118 hdr->opcode = ISCSI_OP_R2T; 3119 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3120 int_to_scsilun(cmd->se_cmd.orig_fe_lun, 3121 (struct scsi_lun *)&hdr->lun); 3122 hdr->itt = cmd->init_task_tag; 3123 if (conn->conn_transport->iscsit_get_r2t_ttt) 3124 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t); 3125 else 3126 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess); 3127 hdr->ttt = cpu_to_be32(r2t->targ_xfer_tag); 3128 hdr->statsn = cpu_to_be32(conn->stat_sn); 3129 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3130 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3131 hdr->r2tsn = cpu_to_be32(r2t->r2t_sn); 3132 hdr->data_offset = cpu_to_be32(r2t->offset); 3133 hdr->data_length = cpu_to_be32(r2t->xfer_len); 3134 3135 pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:" 3136 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n", 3137 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag, 3138 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn, 3139 r2t->offset, r2t->xfer_len, conn->cid); 3140 3141 spin_lock_bh(&cmd->r2t_lock); 3142 r2t->sent_r2t = 1; 3143 spin_unlock_bh(&cmd->r2t_lock); 3144 3145 ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3146 if (ret < 0) { 3147 return ret; 3148 } 3149 3150 spin_lock_bh(&cmd->dataout_timeout_lock); 3151 iscsit_start_dataout_timer(cmd, conn); 3152 spin_unlock_bh(&cmd->dataout_timeout_lock); 3153 3154 return 0; 3155 } 3156 3157 /* 3158 * @recovery: If called from iscsi_task_reassign_complete_write() for 3159 * connection recovery. 3160 */ iscsit_build_r2ts_for_cmd(struct iscsit_conn * conn,struct iscsit_cmd * cmd,bool recovery)3161 int iscsit_build_r2ts_for_cmd( 3162 struct iscsit_conn *conn, 3163 struct iscsit_cmd *cmd, 3164 bool recovery) 3165 { 3166 int first_r2t = 1; 3167 u32 offset = 0, xfer_len = 0; 3168 3169 spin_lock_bh(&cmd->r2t_lock); 3170 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) { 3171 spin_unlock_bh(&cmd->r2t_lock); 3172 return 0; 3173 } 3174 3175 if (conn->sess->sess_ops->DataSequenceInOrder && 3176 !recovery) 3177 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done); 3178 3179 while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) { 3180 if (conn->sess->sess_ops->DataSequenceInOrder) { 3181 offset = cmd->r2t_offset; 3182 3183 if (first_r2t && recovery) { 3184 int new_data_end = offset + 3185 conn->sess->sess_ops->MaxBurstLength - 3186 cmd->next_burst_len; 3187 3188 if (new_data_end > cmd->se_cmd.data_length) 3189 xfer_len = cmd->se_cmd.data_length - offset; 3190 else 3191 xfer_len = 3192 conn->sess->sess_ops->MaxBurstLength - 3193 cmd->next_burst_len; 3194 } else { 3195 int new_data_end = offset + 3196 conn->sess->sess_ops->MaxBurstLength; 3197 3198 if (new_data_end > cmd->se_cmd.data_length) 3199 xfer_len = cmd->se_cmd.data_length - offset; 3200 else 3201 xfer_len = conn->sess->sess_ops->MaxBurstLength; 3202 } 3203 3204 if ((s32)xfer_len < 0) { 3205 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3206 break; 3207 } 3208 3209 cmd->r2t_offset += xfer_len; 3210 3211 if (cmd->r2t_offset == cmd->se_cmd.data_length) 3212 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3213 } else { 3214 struct iscsi_seq *seq; 3215 3216 seq = iscsit_get_seq_holder_for_r2t(cmd); 3217 if (!seq) { 3218 spin_unlock_bh(&cmd->r2t_lock); 3219 return -1; 3220 } 3221 3222 offset = seq->offset; 3223 xfer_len = seq->xfer_len; 3224 3225 if (cmd->seq_send_order == cmd->seq_count) 3226 cmd->cmd_flags |= ICF_SENT_LAST_R2T; 3227 } 3228 cmd->outstanding_r2ts++; 3229 first_r2t = 0; 3230 3231 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) { 3232 spin_unlock_bh(&cmd->r2t_lock); 3233 return -1; 3234 } 3235 3236 if (cmd->cmd_flags & ICF_SENT_LAST_R2T) 3237 break; 3238 } 3239 spin_unlock_bh(&cmd->r2t_lock); 3240 3241 return 0; 3242 } 3243 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd); 3244 iscsit_build_rsp_pdu(struct iscsit_cmd * cmd,struct iscsit_conn * conn,bool inc_stat_sn,struct iscsi_scsi_rsp * hdr)3245 void iscsit_build_rsp_pdu(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3246 bool inc_stat_sn, struct iscsi_scsi_rsp *hdr) 3247 { 3248 if (inc_stat_sn) 3249 cmd->stat_sn = conn->stat_sn++; 3250 3251 atomic_long_inc(&conn->sess->rsp_pdus); 3252 3253 memset(hdr, 0, ISCSI_HDR_LEN); 3254 hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; 3255 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3256 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) { 3257 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW; 3258 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3259 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) { 3260 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW; 3261 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count); 3262 } 3263 hdr->response = cmd->iscsi_response; 3264 hdr->cmd_status = cmd->se_cmd.scsi_status; 3265 hdr->itt = cmd->init_task_tag; 3266 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3267 3268 iscsit_increment_maxcmdsn(cmd, conn->sess); 3269 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3270 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3271 3272 pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x," 3273 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n", 3274 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status, 3275 cmd->se_cmd.scsi_status, conn->cid); 3276 } 3277 EXPORT_SYMBOL(iscsit_build_rsp_pdu); 3278 iscsit_send_response(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3279 static int iscsit_send_response(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3280 { 3281 struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0]; 3282 bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS); 3283 void *data_buf = NULL; 3284 u32 padding = 0, data_buf_len = 0; 3285 3286 iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr); 3287 3288 /* 3289 * Attach SENSE DATA payload to iSCSI Response PDU 3290 */ 3291 if (cmd->se_cmd.sense_buffer && 3292 ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 3293 (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 3294 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); 3295 cmd->se_cmd.scsi_sense_length += sizeof (__be16); 3296 3297 padding = -(cmd->se_cmd.scsi_sense_length) & 3; 3298 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length); 3299 data_buf = cmd->sense_buffer; 3300 data_buf_len = cmd->se_cmd.scsi_sense_length + padding; 3301 3302 if (padding) { 3303 memset(cmd->sense_buffer + 3304 cmd->se_cmd.scsi_sense_length, 0, padding); 3305 pr_debug("Adding %u bytes of padding to" 3306 " SENSE.\n", padding); 3307 } 3308 3309 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI" 3310 " Response PDU\n", 3311 cmd->se_cmd.scsi_sense_length); 3312 } 3313 3314 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf, 3315 data_buf_len); 3316 } 3317 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req * se_tmr)3318 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr) 3319 { 3320 switch (se_tmr->response) { 3321 case TMR_FUNCTION_COMPLETE: 3322 return ISCSI_TMF_RSP_COMPLETE; 3323 case TMR_TASK_DOES_NOT_EXIST: 3324 return ISCSI_TMF_RSP_NO_TASK; 3325 case TMR_LUN_DOES_NOT_EXIST: 3326 return ISCSI_TMF_RSP_NO_LUN; 3327 case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED: 3328 return ISCSI_TMF_RSP_NOT_SUPPORTED; 3329 case TMR_FUNCTION_REJECTED: 3330 default: 3331 return ISCSI_TMF_RSP_REJECTED; 3332 } 3333 } 3334 3335 void iscsit_build_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_tm_rsp * hdr)3336 iscsit_build_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3337 struct iscsi_tm_rsp *hdr) 3338 { 3339 struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req; 3340 3341 hdr->opcode = ISCSI_OP_SCSI_TMFUNC_RSP; 3342 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3343 hdr->response = iscsit_convert_tcm_tmr_rsp(se_tmr); 3344 hdr->itt = cmd->init_task_tag; 3345 cmd->stat_sn = conn->stat_sn++; 3346 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3347 3348 iscsit_increment_maxcmdsn(cmd, conn->sess); 3349 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3350 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3351 3352 pr_debug("Built Task Management Response ITT: 0x%08x," 3353 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n", 3354 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid); 3355 } 3356 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp); 3357 3358 static int iscsit_send_task_mgt_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3359 iscsit_send_task_mgt_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn) 3360 { 3361 struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0]; 3362 3363 iscsit_build_task_mgt_rsp(cmd, conn, hdr); 3364 3365 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0); 3366 } 3367 3368 #define SENDTARGETS_BUF_LIMIT 32768U 3369 3370 static int iscsit_build_sendtargets_response(struct iscsit_cmd * cmd,enum iscsit_transport_type network_transport,int skip_bytes,bool * completed)3371 iscsit_build_sendtargets_response(struct iscsit_cmd *cmd, 3372 enum iscsit_transport_type network_transport, 3373 int skip_bytes, bool *completed) 3374 { 3375 char *payload = NULL; 3376 struct iscsit_conn *conn = cmd->conn; 3377 struct iscsi_portal_group *tpg; 3378 struct iscsi_tiqn *tiqn; 3379 struct iscsi_tpg_np *tpg_np; 3380 int buffer_len, end_of_buf = 0, len = 0, payload_len = 0; 3381 int target_name_printed; 3382 unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */ 3383 unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL; 3384 bool active; 3385 3386 buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength, 3387 SENDTARGETS_BUF_LIMIT); 3388 3389 payload = kzalloc(buffer_len, GFP_KERNEL); 3390 if (!payload) 3391 return -ENOMEM; 3392 3393 /* 3394 * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE 3395 * explicit case.. 3396 */ 3397 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) { 3398 text_ptr = strchr(text_in, '='); 3399 if (!text_ptr) { 3400 pr_err("Unable to locate '=' string in text_in:" 3401 " %s\n", text_in); 3402 kfree(payload); 3403 return -EINVAL; 3404 } 3405 /* 3406 * Skip over '=' character.. 3407 */ 3408 text_ptr += 1; 3409 } 3410 3411 spin_lock(&tiqn_lock); 3412 list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) { 3413 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) && 3414 strcmp(tiqn->tiqn, text_ptr)) { 3415 continue; 3416 } 3417 3418 target_name_printed = 0; 3419 3420 spin_lock(&tiqn->tiqn_tpg_lock); 3421 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) { 3422 3423 /* If demo_mode_discovery=0 and generate_node_acls=0 3424 * (demo mode dislabed) do not return 3425 * TargetName+TargetAddress unless a NodeACL exists. 3426 */ 3427 3428 if ((tpg->tpg_attrib.generate_node_acls == 0) && 3429 (tpg->tpg_attrib.demo_mode_discovery == 0) && 3430 (!target_tpg_has_node_acl(&tpg->tpg_se_tpg, 3431 cmd->conn->sess->sess_ops->InitiatorName))) { 3432 continue; 3433 } 3434 3435 spin_lock(&tpg->tpg_state_lock); 3436 active = (tpg->tpg_state == TPG_STATE_ACTIVE); 3437 spin_unlock(&tpg->tpg_state_lock); 3438 3439 if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets) 3440 continue; 3441 3442 spin_lock(&tpg->tpg_np_lock); 3443 list_for_each_entry(tpg_np, &tpg->tpg_gnp_list, 3444 tpg_np_list) { 3445 struct iscsi_np *np = tpg_np->tpg_np; 3446 struct sockaddr_storage *sockaddr; 3447 3448 if (np->np_network_transport != network_transport) 3449 continue; 3450 3451 if (!target_name_printed) { 3452 len = sprintf(buf, "TargetName=%s", 3453 tiqn->tiqn); 3454 len += 1; 3455 3456 if ((len + payload_len) > buffer_len) { 3457 spin_unlock(&tpg->tpg_np_lock); 3458 spin_unlock(&tiqn->tiqn_tpg_lock); 3459 end_of_buf = 1; 3460 goto eob; 3461 } 3462 3463 if (skip_bytes && len <= skip_bytes) { 3464 skip_bytes -= len; 3465 } else { 3466 memcpy(payload + payload_len, buf, len); 3467 payload_len += len; 3468 target_name_printed = 1; 3469 if (len > skip_bytes) 3470 skip_bytes = 0; 3471 } 3472 } 3473 3474 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr)) 3475 sockaddr = &conn->local_sockaddr; 3476 else 3477 sockaddr = &np->np_sockaddr; 3478 3479 len = sprintf(buf, "TargetAddress=" 3480 "%pISpc,%hu", 3481 sockaddr, 3482 tpg->tpgt); 3483 len += 1; 3484 3485 if ((len + payload_len) > buffer_len) { 3486 spin_unlock(&tpg->tpg_np_lock); 3487 spin_unlock(&tiqn->tiqn_tpg_lock); 3488 end_of_buf = 1; 3489 goto eob; 3490 } 3491 3492 if (skip_bytes && len <= skip_bytes) { 3493 skip_bytes -= len; 3494 } else { 3495 memcpy(payload + payload_len, buf, len); 3496 payload_len += len; 3497 if (len > skip_bytes) 3498 skip_bytes = 0; 3499 } 3500 } 3501 spin_unlock(&tpg->tpg_np_lock); 3502 } 3503 spin_unlock(&tiqn->tiqn_tpg_lock); 3504 eob: 3505 if (end_of_buf) { 3506 *completed = false; 3507 break; 3508 } 3509 3510 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) 3511 break; 3512 } 3513 spin_unlock(&tiqn_lock); 3514 3515 cmd->buf_ptr = payload; 3516 3517 return payload_len; 3518 } 3519 3520 int iscsit_build_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_text_rsp * hdr,enum iscsit_transport_type network_transport)3521 iscsit_build_text_rsp(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3522 struct iscsi_text_rsp *hdr, 3523 enum iscsit_transport_type network_transport) 3524 { 3525 int text_length, padding; 3526 bool completed = true; 3527 3528 text_length = iscsit_build_sendtargets_response(cmd, network_transport, 3529 cmd->read_data_done, 3530 &completed); 3531 if (text_length < 0) 3532 return text_length; 3533 3534 if (completed) { 3535 hdr->flags = ISCSI_FLAG_CMD_FINAL; 3536 } else { 3537 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE; 3538 cmd->read_data_done += text_length; 3539 if (cmd->targ_xfer_tag == 0xFFFFFFFF) 3540 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); 3541 } 3542 hdr->opcode = ISCSI_OP_TEXT_RSP; 3543 padding = ((-text_length) & 3); 3544 hton24(hdr->dlength, text_length); 3545 hdr->itt = cmd->init_task_tag; 3546 hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag); 3547 cmd->stat_sn = conn->stat_sn++; 3548 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3549 3550 iscsit_increment_maxcmdsn(cmd, conn->sess); 3551 /* 3552 * Reset maxcmdsn_inc in multi-part text payload exchanges to 3553 * correctly increment MaxCmdSN for each response answering a 3554 * non immediate text request with a valid CmdSN. 3555 */ 3556 cmd->maxcmdsn_inc = 0; 3557 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3558 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3559 3560 pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," 3561 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, 3562 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, 3563 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), 3564 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 3565 3566 return text_length + padding; 3567 } 3568 EXPORT_SYMBOL(iscsit_build_text_rsp); 3569 iscsit_send_text_rsp(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3570 static int iscsit_send_text_rsp( 3571 struct iscsit_cmd *cmd, 3572 struct iscsit_conn *conn) 3573 { 3574 struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu; 3575 int text_length; 3576 3577 text_length = iscsit_build_text_rsp(cmd, conn, hdr, 3578 conn->conn_transport->transport_type); 3579 if (text_length < 0) 3580 return text_length; 3581 3582 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3583 cmd->buf_ptr, 3584 text_length); 3585 } 3586 3587 void iscsit_build_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn,struct iscsi_reject * hdr)3588 iscsit_build_reject(struct iscsit_cmd *cmd, struct iscsit_conn *conn, 3589 struct iscsi_reject *hdr) 3590 { 3591 hdr->opcode = ISCSI_OP_REJECT; 3592 hdr->reason = cmd->reject_reason; 3593 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 3594 hton24(hdr->dlength, ISCSI_HDR_LEN); 3595 hdr->ffffffff = cpu_to_be32(0xffffffff); 3596 cmd->stat_sn = conn->stat_sn++; 3597 hdr->statsn = cpu_to_be32(cmd->stat_sn); 3598 hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn); 3599 hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn)); 3600 3601 } 3602 EXPORT_SYMBOL(iscsit_build_reject); 3603 iscsit_send_reject(struct iscsit_cmd * cmd,struct iscsit_conn * conn)3604 static int iscsit_send_reject( 3605 struct iscsit_cmd *cmd, 3606 struct iscsit_conn *conn) 3607 { 3608 struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0]; 3609 3610 iscsit_build_reject(cmd, conn, hdr); 3611 3612 pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x," 3613 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid); 3614 3615 return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, 3616 cmd->buf_ptr, 3617 ISCSI_HDR_LEN); 3618 } 3619 iscsit_thread_get_cpumask(struct iscsit_conn * conn)3620 void iscsit_thread_get_cpumask(struct iscsit_conn *conn) 3621 { 3622 int ord, cpu; 3623 cpumask_var_t conn_allowed_cpumask; 3624 3625 /* 3626 * bitmap_id is assigned from iscsit_global->ts_bitmap from 3627 * within iscsit_start_kthreads() 3628 * 3629 * Here we use bitmap_id to determine which CPU that this 3630 * iSCSI connection's RX/TX threads will be scheduled to 3631 * execute upon. 3632 */ 3633 if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) { 3634 ord = conn->bitmap_id % cpumask_weight(cpu_online_mask); 3635 for_each_online_cpu(cpu) { 3636 if (ord-- == 0) { 3637 cpumask_set_cpu(cpu, conn->conn_cpumask); 3638 return; 3639 } 3640 } 3641 } else { 3642 cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask, 3643 cpu_online_mask); 3644 3645 cpumask_clear(conn->conn_cpumask); 3646 ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask); 3647 for_each_cpu(cpu, conn_allowed_cpumask) { 3648 if (ord-- == 0) { 3649 cpumask_set_cpu(cpu, conn->conn_cpumask); 3650 free_cpumask_var(conn_allowed_cpumask); 3651 return; 3652 } 3653 } 3654 free_cpumask_var(conn_allowed_cpumask); 3655 } 3656 /* 3657 * This should never be reached.. 3658 */ 3659 dump_stack(); 3660 cpumask_setall(conn->conn_cpumask); 3661 } 3662 iscsit_thread_reschedule(struct iscsit_conn * conn)3663 static void iscsit_thread_reschedule(struct iscsit_conn *conn) 3664 { 3665 /* 3666 * If iscsit_global->allowed_cpumask modified, reschedule iSCSI 3667 * connection's RX/TX threads update conn->allowed_cpumask. 3668 */ 3669 if (!cpumask_equal(iscsit_global->allowed_cpumask, 3670 conn->allowed_cpumask)) { 3671 iscsit_thread_get_cpumask(conn); 3672 conn->conn_tx_reset_cpumask = 1; 3673 conn->conn_rx_reset_cpumask = 1; 3674 cpumask_copy(conn->allowed_cpumask, 3675 iscsit_global->allowed_cpumask); 3676 } 3677 } 3678 iscsit_thread_check_cpumask(struct iscsit_conn * conn,struct task_struct * p,int mode)3679 void iscsit_thread_check_cpumask( 3680 struct iscsit_conn *conn, 3681 struct task_struct *p, 3682 int mode) 3683 { 3684 /* 3685 * The TX and RX threads maybe call iscsit_thread_check_cpumask() 3686 * at the same time. The RX thread might be faster and return from 3687 * iscsit_thread_reschedule() with conn_rx_reset_cpumask set to 0. 3688 * Then the TX thread sets it back to 1. 3689 * The next time the RX thread loops, it sees conn_rx_reset_cpumask 3690 * set to 1 and calls set_cpus_allowed_ptr() again and set it to 0. 3691 */ 3692 iscsit_thread_reschedule(conn); 3693 3694 /* 3695 * mode == 1 signals iscsi_target_tx_thread() usage. 3696 * mode == 0 signals iscsi_target_rx_thread() usage. 3697 */ 3698 if (mode == 1) { 3699 if (!conn->conn_tx_reset_cpumask) 3700 return; 3701 } else { 3702 if (!conn->conn_rx_reset_cpumask) 3703 return; 3704 } 3705 3706 /* 3707 * Update the CPU mask for this single kthread so that 3708 * both TX and RX kthreads are scheduled to run on the 3709 * same CPU. 3710 */ 3711 set_cpus_allowed_ptr(p, conn->conn_cpumask); 3712 if (mode == 1) 3713 conn->conn_tx_reset_cpumask = 0; 3714 else 3715 conn->conn_rx_reset_cpumask = 0; 3716 } 3717 EXPORT_SYMBOL(iscsit_thread_check_cpumask); 3718 3719 int iscsit_immediate_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3720 iscsit_immediate_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3721 { 3722 int ret; 3723 3724 switch (state) { 3725 case ISTATE_SEND_R2T: 3726 ret = iscsit_send_r2t(cmd, conn); 3727 if (ret < 0) 3728 goto err; 3729 break; 3730 case ISTATE_REMOVE: 3731 spin_lock_bh(&conn->cmd_lock); 3732 list_del_init(&cmd->i_conn_node); 3733 spin_unlock_bh(&conn->cmd_lock); 3734 3735 iscsit_free_cmd(cmd, false); 3736 break; 3737 case ISTATE_SEND_NOPIN_WANT_RESPONSE: 3738 iscsit_mod_nopin_response_timer(conn); 3739 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1); 3740 if (ret < 0) 3741 goto err; 3742 break; 3743 case ISTATE_SEND_NOPIN_NO_RESPONSE: 3744 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0); 3745 if (ret < 0) 3746 goto err; 3747 break; 3748 default: 3749 pr_err("Unknown Opcode: 0x%02x ITT:" 3750 " 0x%08x, i_state: %d on CID: %hu\n", 3751 cmd->iscsi_opcode, cmd->init_task_tag, state, 3752 conn->cid); 3753 goto err; 3754 } 3755 3756 return 0; 3757 3758 err: 3759 return -1; 3760 } 3761 EXPORT_SYMBOL(iscsit_immediate_queue); 3762 3763 static int iscsit_handle_immediate_queue(struct iscsit_conn * conn)3764 iscsit_handle_immediate_queue(struct iscsit_conn *conn) 3765 { 3766 struct iscsit_transport *t = conn->conn_transport; 3767 struct iscsi_queue_req *qr; 3768 struct iscsit_cmd *cmd; 3769 u8 state; 3770 int ret; 3771 3772 while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) { 3773 atomic_set(&conn->check_immediate_queue, 0); 3774 cmd = qr->cmd; 3775 state = qr->state; 3776 kmem_cache_free(lio_qr_cache, qr); 3777 3778 ret = t->iscsit_immediate_queue(conn, cmd, state); 3779 if (ret < 0) 3780 return ret; 3781 } 3782 3783 return 0; 3784 } 3785 3786 int iscsit_response_queue(struct iscsit_conn * conn,struct iscsit_cmd * cmd,int state)3787 iscsit_response_queue(struct iscsit_conn *conn, struct iscsit_cmd *cmd, int state) 3788 { 3789 int ret; 3790 3791 check_rsp_state: 3792 switch (state) { 3793 case ISTATE_SEND_DATAIN: 3794 ret = iscsit_send_datain(cmd, conn); 3795 if (ret < 0) 3796 goto err; 3797 else if (!ret) 3798 /* more drs */ 3799 goto check_rsp_state; 3800 else if (ret == 1) { 3801 /* all done */ 3802 spin_lock_bh(&cmd->istate_lock); 3803 cmd->i_state = ISTATE_SENT_STATUS; 3804 spin_unlock_bh(&cmd->istate_lock); 3805 3806 if (atomic_read(&conn->check_immediate_queue)) 3807 return 1; 3808 3809 return 0; 3810 } else if (ret == 2) { 3811 /* Still must send status, 3812 SCF_TRANSPORT_TASK_SENSE was set */ 3813 spin_lock_bh(&cmd->istate_lock); 3814 cmd->i_state = ISTATE_SEND_STATUS; 3815 spin_unlock_bh(&cmd->istate_lock); 3816 state = ISTATE_SEND_STATUS; 3817 goto check_rsp_state; 3818 } 3819 3820 break; 3821 case ISTATE_SEND_STATUS: 3822 case ISTATE_SEND_STATUS_RECOVERY: 3823 ret = iscsit_send_response(cmd, conn); 3824 break; 3825 case ISTATE_SEND_LOGOUTRSP: 3826 ret = iscsit_send_logout(cmd, conn); 3827 break; 3828 case ISTATE_SEND_ASYNCMSG: 3829 ret = iscsit_send_conn_drop_async_message( 3830 cmd, conn); 3831 break; 3832 case ISTATE_SEND_NOPIN: 3833 ret = iscsit_send_nopin(cmd, conn); 3834 break; 3835 case ISTATE_SEND_REJECT: 3836 ret = iscsit_send_reject(cmd, conn); 3837 break; 3838 case ISTATE_SEND_TASKMGTRSP: 3839 ret = iscsit_send_task_mgt_rsp(cmd, conn); 3840 if (ret != 0) 3841 break; 3842 ret = iscsit_tmr_post_handler(cmd, conn); 3843 if (ret != 0) 3844 iscsit_fall_back_to_erl0(conn->sess); 3845 break; 3846 case ISTATE_SEND_TEXTRSP: 3847 ret = iscsit_send_text_rsp(cmd, conn); 3848 break; 3849 default: 3850 pr_err("Unknown Opcode: 0x%02x ITT:" 3851 " 0x%08x, i_state: %d on CID: %hu\n", 3852 cmd->iscsi_opcode, cmd->init_task_tag, 3853 state, conn->cid); 3854 goto err; 3855 } 3856 if (ret < 0) 3857 goto err; 3858 3859 switch (state) { 3860 case ISTATE_SEND_LOGOUTRSP: 3861 if (!iscsit_logout_post_handler(cmd, conn)) 3862 return -ECONNRESET; 3863 fallthrough; 3864 case ISTATE_SEND_STATUS: 3865 case ISTATE_SEND_ASYNCMSG: 3866 case ISTATE_SEND_NOPIN: 3867 case ISTATE_SEND_STATUS_RECOVERY: 3868 case ISTATE_SEND_TEXTRSP: 3869 case ISTATE_SEND_TASKMGTRSP: 3870 case ISTATE_SEND_REJECT: 3871 spin_lock_bh(&cmd->istate_lock); 3872 cmd->i_state = ISTATE_SENT_STATUS; 3873 spin_unlock_bh(&cmd->istate_lock); 3874 break; 3875 default: 3876 pr_err("Unknown Opcode: 0x%02x ITT:" 3877 " 0x%08x, i_state: %d on CID: %hu\n", 3878 cmd->iscsi_opcode, cmd->init_task_tag, 3879 cmd->i_state, conn->cid); 3880 goto err; 3881 } 3882 3883 if (atomic_read(&conn->check_immediate_queue)) 3884 return 1; 3885 3886 return 0; 3887 3888 err: 3889 return -1; 3890 } 3891 EXPORT_SYMBOL(iscsit_response_queue); 3892 iscsit_handle_response_queue(struct iscsit_conn * conn)3893 static int iscsit_handle_response_queue(struct iscsit_conn *conn) 3894 { 3895 struct iscsit_transport *t = conn->conn_transport; 3896 struct iscsi_queue_req *qr; 3897 struct iscsit_cmd *cmd; 3898 u8 state; 3899 int ret; 3900 3901 while ((qr = iscsit_get_cmd_from_response_queue(conn))) { 3902 cmd = qr->cmd; 3903 state = qr->state; 3904 kmem_cache_free(lio_qr_cache, qr); 3905 3906 ret = t->iscsit_response_queue(conn, cmd, state); 3907 if (ret == 1 || ret < 0) 3908 return ret; 3909 } 3910 3911 return 0; 3912 } 3913 iscsi_target_tx_thread(void * arg)3914 int iscsi_target_tx_thread(void *arg) 3915 { 3916 int ret = 0; 3917 struct iscsit_conn *conn = arg; 3918 bool conn_freed = false; 3919 3920 /* 3921 * Allow ourselves to be interrupted by SIGINT so that a 3922 * connection recovery / failure event can be triggered externally. 3923 */ 3924 allow_signal(SIGINT); 3925 3926 while (!kthread_should_stop()) { 3927 /* 3928 * Ensure that both TX and RX per connection kthreads 3929 * are scheduled to run on the same CPU. 3930 */ 3931 iscsit_thread_check_cpumask(conn, current, 1); 3932 3933 wait_event_interruptible(conn->queues_wq, 3934 !iscsit_conn_all_queues_empty(conn)); 3935 3936 if (signal_pending(current)) 3937 goto transport_err; 3938 3939 get_immediate: 3940 ret = iscsit_handle_immediate_queue(conn); 3941 if (ret < 0) 3942 goto transport_err; 3943 3944 ret = iscsit_handle_response_queue(conn); 3945 if (ret == 1) { 3946 goto get_immediate; 3947 } else if (ret == -ECONNRESET) { 3948 conn_freed = true; 3949 goto out; 3950 } else if (ret < 0) { 3951 goto transport_err; 3952 } 3953 } 3954 3955 transport_err: 3956 /* 3957 * Avoid the normal connection failure code-path if this connection 3958 * is still within LOGIN mode, and iscsi_np process context is 3959 * responsible for cleaning up the early connection failure. 3960 */ 3961 if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN) 3962 iscsit_take_action_for_connection_exit(conn, &conn_freed); 3963 out: 3964 if (!conn_freed) { 3965 while (!kthread_should_stop()) { 3966 msleep(100); 3967 } 3968 } 3969 return 0; 3970 } 3971 iscsi_target_rx_opcode(struct iscsit_conn * conn,unsigned char * buf)3972 static int iscsi_target_rx_opcode(struct iscsit_conn *conn, unsigned char *buf) 3973 { 3974 struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf; 3975 struct iscsit_cmd *cmd; 3976 int ret = 0; 3977 3978 switch (hdr->opcode & ISCSI_OPCODE_MASK) { 3979 case ISCSI_OP_SCSI_CMD: 3980 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3981 if (!cmd) 3982 goto reject; 3983 3984 ret = iscsit_handle_scsi_cmd(conn, cmd, buf); 3985 break; 3986 case ISCSI_OP_SCSI_DATA_OUT: 3987 ret = iscsit_handle_data_out(conn, buf); 3988 break; 3989 case ISCSI_OP_NOOP_OUT: 3990 cmd = NULL; 3991 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) { 3992 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 3993 if (!cmd) 3994 goto reject; 3995 } 3996 ret = iscsit_handle_nop_out(conn, cmd, buf); 3997 break; 3998 case ISCSI_OP_SCSI_TMFUNC: 3999 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4000 if (!cmd) 4001 goto reject; 4002 4003 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); 4004 break; 4005 case ISCSI_OP_TEXT: 4006 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { 4007 cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); 4008 if (!cmd) 4009 goto reject; 4010 } else { 4011 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4012 if (!cmd) 4013 goto reject; 4014 } 4015 4016 ret = iscsit_handle_text_cmd(conn, cmd, buf); 4017 break; 4018 case ISCSI_OP_LOGOUT: 4019 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); 4020 if (!cmd) 4021 goto reject; 4022 4023 ret = iscsit_handle_logout_cmd(conn, cmd, buf); 4024 if (ret > 0) 4025 wait_for_completion_timeout(&conn->conn_logout_comp, 4026 SECONDS_FOR_LOGOUT_COMP * HZ); 4027 break; 4028 case ISCSI_OP_SNACK: 4029 ret = iscsit_handle_snack(conn, buf); 4030 break; 4031 default: 4032 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode); 4033 if (!conn->sess->sess_ops->ErrorRecoveryLevel) { 4034 pr_err("Cannot recover from unknown" 4035 " opcode while ERL=0, closing iSCSI connection.\n"); 4036 return -1; 4037 } 4038 pr_err("Unable to recover from unknown opcode while OFMarker=No," 4039 " closing iSCSI connection.\n"); 4040 ret = -1; 4041 break; 4042 } 4043 4044 return ret; 4045 reject: 4046 return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf); 4047 } 4048 iscsi_target_check_conn_state(struct iscsit_conn * conn)4049 static bool iscsi_target_check_conn_state(struct iscsit_conn *conn) 4050 { 4051 bool ret; 4052 4053 spin_lock_bh(&conn->state_lock); 4054 ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN); 4055 spin_unlock_bh(&conn->state_lock); 4056 4057 return ret; 4058 } 4059 iscsit_get_rx_pdu(struct iscsit_conn * conn)4060 static void iscsit_get_rx_pdu(struct iscsit_conn *conn) 4061 { 4062 int ret; 4063 u8 *buffer, *tmp_buf, opcode; 4064 u32 checksum = 0, digest = 0; 4065 struct iscsi_hdr *hdr; 4066 struct kvec iov; 4067 4068 buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL); 4069 if (!buffer) 4070 return; 4071 4072 while (!kthread_should_stop()) { 4073 /* 4074 * Ensure that both TX and RX per connection kthreads 4075 * are scheduled to run on the same CPU. 4076 */ 4077 iscsit_thread_check_cpumask(conn, current, 0); 4078 4079 memset(&iov, 0, sizeof(struct kvec)); 4080 4081 iov.iov_base = buffer; 4082 iov.iov_len = ISCSI_HDR_LEN; 4083 4084 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN); 4085 if (ret != ISCSI_HDR_LEN) { 4086 iscsit_rx_thread_wait_for_tcp(conn); 4087 break; 4088 } 4089 4090 hdr = (struct iscsi_hdr *) buffer; 4091 if (hdr->hlength) { 4092 iov.iov_len = hdr->hlength * 4; 4093 tmp_buf = krealloc(buffer, 4094 ISCSI_HDR_LEN + iov.iov_len, 4095 GFP_KERNEL); 4096 if (!tmp_buf) 4097 break; 4098 4099 buffer = tmp_buf; 4100 iov.iov_base = &buffer[ISCSI_HDR_LEN]; 4101 4102 ret = rx_data(conn, &iov, 1, iov.iov_len); 4103 if (ret != iov.iov_len) { 4104 iscsit_rx_thread_wait_for_tcp(conn); 4105 break; 4106 } 4107 } 4108 4109 if (conn->conn_ops->HeaderDigest) { 4110 iov.iov_base = &digest; 4111 iov.iov_len = ISCSI_CRC_LEN; 4112 4113 ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 4114 if (ret != ISCSI_CRC_LEN) { 4115 iscsit_rx_thread_wait_for_tcp(conn); 4116 break; 4117 } 4118 4119 iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer, 4120 ISCSI_HDR_LEN, 0, NULL, 4121 &checksum); 4122 4123 if (digest != checksum) { 4124 pr_err("HeaderDigest CRC32C failed," 4125 " received 0x%08x, computed 0x%08x\n", 4126 digest, checksum); 4127 /* 4128 * Set the PDU to 0xff so it will intentionally 4129 * hit default in the switch below. 4130 */ 4131 memset(buffer, 0xff, ISCSI_HDR_LEN); 4132 atomic_long_inc(&conn->sess->conn_digest_errors); 4133 } else { 4134 pr_debug("Got HeaderDigest CRC32C" 4135 " 0x%08x\n", checksum); 4136 } 4137 } 4138 4139 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) 4140 break; 4141 4142 opcode = buffer[0] & ISCSI_OPCODE_MASK; 4143 4144 if (conn->sess->sess_ops->SessionType && 4145 ((!(opcode & ISCSI_OP_TEXT)) || 4146 (!(opcode & ISCSI_OP_LOGOUT)))) { 4147 pr_err("Received illegal iSCSI Opcode: 0x%02x" 4148 " while in Discovery Session, rejecting.\n", opcode); 4149 iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, 4150 buffer); 4151 break; 4152 } 4153 4154 ret = iscsi_target_rx_opcode(conn, buffer); 4155 if (ret < 0) 4156 break; 4157 } 4158 4159 kfree(buffer); 4160 } 4161 iscsi_target_rx_thread(void * arg)4162 int iscsi_target_rx_thread(void *arg) 4163 { 4164 int rc; 4165 struct iscsit_conn *conn = arg; 4166 bool conn_freed = false; 4167 4168 /* 4169 * Allow ourselves to be interrupted by SIGINT so that a 4170 * connection recovery / failure event can be triggered externally. 4171 */ 4172 allow_signal(SIGINT); 4173 /* 4174 * Wait for iscsi_post_login_handler() to complete before allowing 4175 * incoming iscsi/tcp socket I/O, and/or failing the connection. 4176 */ 4177 rc = wait_for_completion_interruptible(&conn->rx_login_comp); 4178 if (rc < 0 || iscsi_target_check_conn_state(conn)) 4179 goto out; 4180 4181 if (!conn->conn_transport->iscsit_get_rx_pdu) 4182 return 0; 4183 4184 conn->conn_transport->iscsit_get_rx_pdu(conn); 4185 4186 if (!signal_pending(current)) 4187 atomic_set(&conn->transport_failed, 1); 4188 iscsit_take_action_for_connection_exit(conn, &conn_freed); 4189 4190 out: 4191 if (!conn_freed) { 4192 while (!kthread_should_stop()) { 4193 msleep(100); 4194 } 4195 } 4196 4197 return 0; 4198 } 4199 iscsit_release_commands_from_conn(struct iscsit_conn * conn)4200 static void iscsit_release_commands_from_conn(struct iscsit_conn *conn) 4201 { 4202 LIST_HEAD(tmp_list); 4203 struct iscsit_cmd *cmd = NULL, *cmd_tmp = NULL; 4204 struct iscsit_session *sess = conn->sess; 4205 /* 4206 * We expect this function to only ever be called from either RX or TX 4207 * thread context via iscsit_close_connection() once the other context 4208 * has been reset -> returned sleeping pre-handler state. 4209 */ 4210 spin_lock_bh(&conn->cmd_lock); 4211 list_splice_init(&conn->conn_cmd_list, &tmp_list); 4212 4213 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4214 struct se_cmd *se_cmd = &cmd->se_cmd; 4215 4216 if (!se_cmd->se_tfo) 4217 continue; 4218 4219 spin_lock_irq(&se_cmd->t_state_lock); 4220 if (se_cmd->transport_state & CMD_T_ABORTED) { 4221 if (!(se_cmd->transport_state & CMD_T_TAS)) 4222 /* 4223 * LIO's abort path owns the cleanup for this, 4224 * so put it back on the list and let 4225 * aborted_task handle it. 4226 */ 4227 list_move_tail(&cmd->i_conn_node, 4228 &conn->conn_cmd_list); 4229 } else { 4230 se_cmd->transport_state |= CMD_T_FABRIC_STOP; 4231 } 4232 4233 if (cmd->se_cmd.t_state == TRANSPORT_WRITE_PENDING) { 4234 /* 4235 * We never submitted the cmd to LIO core, so we have 4236 * to tell LIO to perform the completion process. 4237 */ 4238 spin_unlock_irq(&se_cmd->t_state_lock); 4239 target_complete_cmd(&cmd->se_cmd, SAM_STAT_TASK_ABORTED); 4240 continue; 4241 } 4242 spin_unlock_irq(&se_cmd->t_state_lock); 4243 } 4244 spin_unlock_bh(&conn->cmd_lock); 4245 4246 list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) { 4247 list_del_init(&cmd->i_conn_node); 4248 4249 iscsit_increment_maxcmdsn(cmd, sess); 4250 iscsit_free_cmd(cmd, true); 4251 4252 } 4253 4254 /* 4255 * Wait on commands that were cleaned up via the aborted_task path. 4256 * LLDs that implement iscsit_wait_conn will already have waited for 4257 * commands. 4258 */ 4259 if (!conn->conn_transport->iscsit_wait_conn) { 4260 target_stop_cmd_counter(conn->cmd_cnt); 4261 target_wait_for_cmds(conn->cmd_cnt); 4262 } 4263 } 4264 iscsit_stop_timers_for_cmds(struct iscsit_conn * conn)4265 static void iscsit_stop_timers_for_cmds( 4266 struct iscsit_conn *conn) 4267 { 4268 struct iscsit_cmd *cmd; 4269 4270 spin_lock_bh(&conn->cmd_lock); 4271 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 4272 if (cmd->data_direction == DMA_TO_DEVICE) 4273 iscsit_stop_dataout_timer(cmd); 4274 } 4275 spin_unlock_bh(&conn->cmd_lock); 4276 } 4277 iscsit_close_connection(struct iscsit_conn * conn)4278 int iscsit_close_connection( 4279 struct iscsit_conn *conn) 4280 { 4281 int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT); 4282 struct iscsit_session *sess = conn->sess; 4283 4284 pr_debug("Closing iSCSI connection CID %hu on SID:" 4285 " %u\n", conn->cid, sess->sid); 4286 /* 4287 * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD 4288 * case just in case the RX Thread in iscsi_target_rx_opcode() is 4289 * sleeping and the logout response never got sent because the 4290 * connection failed. 4291 * 4292 * However for iser-target, isert_wait4logout() is using conn_logout_comp 4293 * to signal logout response TX interrupt completion. Go ahead and skip 4294 * this for iser since isert_rx_opcode() does not wait on logout failure, 4295 * and to avoid iscsit_conn pointer dereference in iser-target code. 4296 */ 4297 if (!conn->conn_transport->rdma_shutdown) 4298 complete(&conn->conn_logout_comp); 4299 4300 if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) { 4301 if (conn->tx_thread && 4302 cmpxchg(&conn->tx_thread_active, true, false)) { 4303 send_sig(SIGINT, conn->tx_thread, 1); 4304 kthread_stop(conn->tx_thread); 4305 } 4306 } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) { 4307 if (conn->rx_thread && 4308 cmpxchg(&conn->rx_thread_active, true, false)) { 4309 send_sig(SIGINT, conn->rx_thread, 1); 4310 kthread_stop(conn->rx_thread); 4311 } 4312 } 4313 4314 spin_lock(&iscsit_global->ts_bitmap_lock); 4315 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id, 4316 get_order(1)); 4317 spin_unlock(&iscsit_global->ts_bitmap_lock); 4318 4319 iscsit_stop_timers_for_cmds(conn); 4320 iscsit_stop_nopin_response_timer(conn); 4321 iscsit_stop_nopin_timer(conn); 4322 4323 if (conn->conn_transport->iscsit_wait_conn) 4324 conn->conn_transport->iscsit_wait_conn(conn); 4325 4326 /* 4327 * During Connection recovery drop unacknowledged out of order 4328 * commands for this connection, and prepare the other commands 4329 * for reallegiance. 4330 * 4331 * During normal operation clear the out of order commands (but 4332 * do not free the struct iscsi_ooo_cmdsn's) and release all 4333 * struct iscsit_cmds. 4334 */ 4335 if (atomic_read(&conn->connection_recovery)) { 4336 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn); 4337 iscsit_prepare_cmds_for_reallegiance(conn); 4338 } else { 4339 iscsit_clear_ooo_cmdsns_for_conn(conn); 4340 iscsit_release_commands_from_conn(conn); 4341 } 4342 iscsit_free_queue_reqs_for_conn(conn); 4343 4344 /* 4345 * Handle decrementing session or connection usage count if 4346 * a logout response was not able to be sent because the 4347 * connection failed. Fall back to Session Recovery here. 4348 */ 4349 if (atomic_read(&conn->conn_logout_remove)) { 4350 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) { 4351 iscsit_dec_conn_usage_count(conn); 4352 iscsit_dec_session_usage_count(sess); 4353 } 4354 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) 4355 iscsit_dec_conn_usage_count(conn); 4356 4357 atomic_set(&conn->conn_logout_remove, 0); 4358 atomic_set(&sess->session_reinstatement, 0); 4359 atomic_set(&sess->session_fall_back_to_erl0, 1); 4360 } 4361 4362 spin_lock_bh(&sess->conn_lock); 4363 list_del(&conn->conn_list); 4364 4365 /* 4366 * Attempt to let the Initiator know this connection failed by 4367 * sending an Connection Dropped Async Message on another 4368 * active connection. 4369 */ 4370 if (atomic_read(&conn->connection_recovery)) 4371 iscsit_build_conn_drop_async_message(conn); 4372 4373 spin_unlock_bh(&sess->conn_lock); 4374 4375 /* 4376 * If connection reinstatement is being performed on this connection, 4377 * up the connection reinstatement semaphore that is being blocked on 4378 * in iscsit_cause_connection_reinstatement(). 4379 */ 4380 spin_lock_bh(&conn->state_lock); 4381 if (atomic_read(&conn->sleep_on_conn_wait_comp)) { 4382 spin_unlock_bh(&conn->state_lock); 4383 complete(&conn->conn_wait_comp); 4384 wait_for_completion(&conn->conn_post_wait_comp); 4385 spin_lock_bh(&conn->state_lock); 4386 } 4387 4388 /* 4389 * If connection reinstatement is being performed on this connection 4390 * by receiving a REMOVECONNFORRECOVERY logout request, up the 4391 * connection wait rcfr semaphore that is being blocked on 4392 * an iscsit_connection_reinstatement_rcfr(). 4393 */ 4394 if (atomic_read(&conn->connection_wait_rcfr)) { 4395 spin_unlock_bh(&conn->state_lock); 4396 complete(&conn->conn_wait_rcfr_comp); 4397 wait_for_completion(&conn->conn_post_wait_comp); 4398 spin_lock_bh(&conn->state_lock); 4399 } 4400 atomic_set(&conn->connection_reinstatement, 1); 4401 spin_unlock_bh(&conn->state_lock); 4402 4403 /* 4404 * If any other processes are accessing this connection pointer we 4405 * must wait until they have completed. 4406 */ 4407 iscsit_check_conn_usage_count(conn); 4408 4409 ahash_request_free(conn->conn_tx_hash); 4410 if (conn->conn_rx_hash) { 4411 struct crypto_ahash *tfm; 4412 4413 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash); 4414 ahash_request_free(conn->conn_rx_hash); 4415 crypto_free_ahash(tfm); 4416 } 4417 4418 if (conn->sock) 4419 sock_release(conn->sock); 4420 4421 if (conn->conn_transport->iscsit_free_conn) 4422 conn->conn_transport->iscsit_free_conn(conn); 4423 4424 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 4425 conn->conn_state = TARG_CONN_STATE_FREE; 4426 iscsit_free_conn(conn); 4427 4428 spin_lock_bh(&sess->conn_lock); 4429 atomic_dec(&sess->nconn); 4430 pr_debug("Decremented iSCSI connection count to %d from node:" 4431 " %s\n", atomic_read(&sess->nconn), 4432 sess->sess_ops->InitiatorName); 4433 /* 4434 * Make sure that if one connection fails in an non ERL=2 iSCSI 4435 * Session that they all fail. 4436 */ 4437 if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout && 4438 !atomic_read(&sess->session_logout)) 4439 atomic_set(&sess->session_fall_back_to_erl0, 1); 4440 4441 /* 4442 * If this was not the last connection in the session, and we are 4443 * performing session reinstatement or falling back to ERL=0, call 4444 * iscsit_stop_session() without sleeping to shutdown the other 4445 * active connections. 4446 */ 4447 if (atomic_read(&sess->nconn)) { 4448 if (!atomic_read(&sess->session_reinstatement) && 4449 !atomic_read(&sess->session_fall_back_to_erl0)) { 4450 spin_unlock_bh(&sess->conn_lock); 4451 return 0; 4452 } 4453 if (!atomic_read(&sess->session_stop_active)) { 4454 atomic_set(&sess->session_stop_active, 1); 4455 spin_unlock_bh(&sess->conn_lock); 4456 iscsit_stop_session(sess, 0, 0); 4457 return 0; 4458 } 4459 spin_unlock_bh(&sess->conn_lock); 4460 return 0; 4461 } 4462 4463 /* 4464 * If this was the last connection in the session and one of the 4465 * following is occurring: 4466 * 4467 * Session Reinstatement is not being performed, and are falling back 4468 * to ERL=0 call iscsit_close_session(). 4469 * 4470 * Session Logout was requested. iscsit_close_session() will be called 4471 * elsewhere. 4472 * 4473 * Session Continuation is not being performed, start the Time2Retain 4474 * handler and check if sleep_on_sess_wait_sem is active. 4475 */ 4476 if (!atomic_read(&sess->session_reinstatement) && 4477 atomic_read(&sess->session_fall_back_to_erl0)) { 4478 spin_unlock_bh(&sess->conn_lock); 4479 complete_all(&sess->session_wait_comp); 4480 iscsit_close_session(sess, true); 4481 4482 return 0; 4483 } else if (atomic_read(&sess->session_logout)) { 4484 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4485 sess->session_state = TARG_SESS_STATE_FREE; 4486 4487 if (atomic_read(&sess->session_close)) { 4488 spin_unlock_bh(&sess->conn_lock); 4489 complete_all(&sess->session_wait_comp); 4490 iscsit_close_session(sess, true); 4491 } else { 4492 spin_unlock_bh(&sess->conn_lock); 4493 } 4494 4495 return 0; 4496 } else { 4497 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4498 sess->session_state = TARG_SESS_STATE_FAILED; 4499 4500 if (!atomic_read(&sess->session_continuation)) 4501 iscsit_start_time2retain_handler(sess); 4502 4503 if (atomic_read(&sess->session_close)) { 4504 spin_unlock_bh(&sess->conn_lock); 4505 complete_all(&sess->session_wait_comp); 4506 iscsit_close_session(sess, true); 4507 } else { 4508 spin_unlock_bh(&sess->conn_lock); 4509 } 4510 4511 return 0; 4512 } 4513 } 4514 4515 /* 4516 * If the iSCSI Session for the iSCSI Initiator Node exists, 4517 * forcefully shutdown the iSCSI NEXUS. 4518 */ iscsit_close_session(struct iscsit_session * sess,bool can_sleep)4519 int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) 4520 { 4521 struct iscsi_portal_group *tpg = sess->tpg; 4522 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4523 4524 if (atomic_read(&sess->nconn)) { 4525 pr_err("%d connection(s) still exist for iSCSI session" 4526 " to %s\n", atomic_read(&sess->nconn), 4527 sess->sess_ops->InitiatorName); 4528 BUG(); 4529 } 4530 4531 spin_lock_bh(&se_tpg->session_lock); 4532 atomic_set(&sess->session_logout, 1); 4533 atomic_set(&sess->session_reinstatement, 1); 4534 iscsit_stop_time2retain_timer(sess); 4535 spin_unlock_bh(&se_tpg->session_lock); 4536 4537 if (sess->sess_ops->ErrorRecoveryLevel == 2) 4538 iscsit_free_connection_recovery_entries(sess); 4539 4540 /* 4541 * transport_deregister_session_configfs() will clear the 4542 * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context 4543 * can be setting it again with __transport_register_session() in 4544 * iscsi_post_login_handler() again after the iscsit_stop_session() 4545 * completes in iscsi_np context. 4546 */ 4547 transport_deregister_session_configfs(sess->se_sess); 4548 4549 /* 4550 * If any other processes are accessing this session pointer we must 4551 * wait until they have completed. If we are in an interrupt (the 4552 * time2retain handler) and contain and active session usage count we 4553 * restart the timer and exit. 4554 */ 4555 if (iscsit_check_session_usage_count(sess, can_sleep)) { 4556 atomic_set(&sess->session_logout, 0); 4557 iscsit_start_time2retain_handler(sess); 4558 return 0; 4559 } 4560 4561 transport_deregister_session(sess->se_sess); 4562 4563 iscsit_free_all_ooo_cmdsns(sess); 4564 4565 spin_lock_bh(&se_tpg->session_lock); 4566 pr_debug("Moving to TARG_SESS_STATE_FREE.\n"); 4567 sess->session_state = TARG_SESS_STATE_FREE; 4568 pr_debug("Released iSCSI session from node: %s\n", 4569 sess->sess_ops->InitiatorName); 4570 tpg->nsessions--; 4571 if (tpg->tpg_tiqn) 4572 tpg->tpg_tiqn->tiqn_nsessions--; 4573 4574 pr_debug("Decremented number of active iSCSI Sessions on" 4575 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions); 4576 4577 ida_free(&sess_ida, sess->session_index); 4578 kfree(sess->sess_ops); 4579 sess->sess_ops = NULL; 4580 spin_unlock_bh(&se_tpg->session_lock); 4581 4582 kfree(sess); 4583 return 0; 4584 } 4585 iscsit_logout_post_handler_closesession(struct iscsit_conn * conn)4586 static void iscsit_logout_post_handler_closesession( 4587 struct iscsit_conn *conn) 4588 { 4589 struct iscsit_session *sess = conn->sess; 4590 int sleep = 1; 4591 /* 4592 * Traditional iscsi/tcp will invoke this logic from TX thread 4593 * context during session logout, so clear tx_thread_active and 4594 * sleep if iscsit_close_connection() has not already occured. 4595 * 4596 * Since iser-target invokes this logic from it's own workqueue, 4597 * always sleep waiting for RX/TX thread shutdown to complete 4598 * within iscsit_close_connection(). 4599 */ 4600 if (!conn->conn_transport->rdma_shutdown) { 4601 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4602 if (!sleep) 4603 return; 4604 } 4605 4606 atomic_set(&conn->conn_logout_remove, 0); 4607 complete(&conn->conn_logout_comp); 4608 4609 iscsit_dec_conn_usage_count(conn); 4610 atomic_set(&sess->session_close, 1); 4611 iscsit_stop_session(sess, sleep, sleep); 4612 iscsit_dec_session_usage_count(sess); 4613 } 4614 iscsit_logout_post_handler_samecid(struct iscsit_conn * conn)4615 static void iscsit_logout_post_handler_samecid( 4616 struct iscsit_conn *conn) 4617 { 4618 int sleep = 1; 4619 4620 if (!conn->conn_transport->rdma_shutdown) { 4621 sleep = cmpxchg(&conn->tx_thread_active, true, false); 4622 if (!sleep) 4623 return; 4624 } 4625 4626 atomic_set(&conn->conn_logout_remove, 0); 4627 complete(&conn->conn_logout_comp); 4628 4629 iscsit_cause_connection_reinstatement(conn, sleep); 4630 iscsit_dec_conn_usage_count(conn); 4631 } 4632 iscsit_logout_post_handler_diffcid(struct iscsit_conn * conn,u16 cid)4633 static void iscsit_logout_post_handler_diffcid( 4634 struct iscsit_conn *conn, 4635 u16 cid) 4636 { 4637 struct iscsit_conn *l_conn; 4638 struct iscsit_session *sess = conn->sess; 4639 bool conn_found = false; 4640 4641 if (!sess) 4642 return; 4643 4644 spin_lock_bh(&sess->conn_lock); 4645 list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) { 4646 if (l_conn->cid == cid) { 4647 iscsit_inc_conn_usage_count(l_conn); 4648 conn_found = true; 4649 break; 4650 } 4651 } 4652 spin_unlock_bh(&sess->conn_lock); 4653 4654 if (!conn_found) 4655 return; 4656 4657 if (l_conn->sock) 4658 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN); 4659 4660 spin_lock_bh(&l_conn->state_lock); 4661 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n"); 4662 l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT; 4663 spin_unlock_bh(&l_conn->state_lock); 4664 4665 iscsit_cause_connection_reinstatement(l_conn, 1); 4666 iscsit_dec_conn_usage_count(l_conn); 4667 } 4668 4669 /* 4670 * Return of 0 causes the TX thread to restart. 4671 */ iscsit_logout_post_handler(struct iscsit_cmd * cmd,struct iscsit_conn * conn)4672 int iscsit_logout_post_handler( 4673 struct iscsit_cmd *cmd, 4674 struct iscsit_conn *conn) 4675 { 4676 int ret = 0; 4677 4678 switch (cmd->logout_reason) { 4679 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 4680 switch (cmd->logout_response) { 4681 case ISCSI_LOGOUT_SUCCESS: 4682 case ISCSI_LOGOUT_CLEANUP_FAILED: 4683 default: 4684 iscsit_logout_post_handler_closesession(conn); 4685 break; 4686 } 4687 break; 4688 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 4689 if (conn->cid == cmd->logout_cid) { 4690 switch (cmd->logout_response) { 4691 case ISCSI_LOGOUT_SUCCESS: 4692 case ISCSI_LOGOUT_CLEANUP_FAILED: 4693 default: 4694 iscsit_logout_post_handler_samecid(conn); 4695 break; 4696 } 4697 } else { 4698 switch (cmd->logout_response) { 4699 case ISCSI_LOGOUT_SUCCESS: 4700 iscsit_logout_post_handler_diffcid(conn, 4701 cmd->logout_cid); 4702 break; 4703 case ISCSI_LOGOUT_CID_NOT_FOUND: 4704 case ISCSI_LOGOUT_CLEANUP_FAILED: 4705 default: 4706 break; 4707 } 4708 ret = 1; 4709 } 4710 break; 4711 case ISCSI_LOGOUT_REASON_RECOVERY: 4712 switch (cmd->logout_response) { 4713 case ISCSI_LOGOUT_SUCCESS: 4714 case ISCSI_LOGOUT_CID_NOT_FOUND: 4715 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED: 4716 case ISCSI_LOGOUT_CLEANUP_FAILED: 4717 default: 4718 break; 4719 } 4720 ret = 1; 4721 break; 4722 default: 4723 break; 4724 4725 } 4726 return ret; 4727 } 4728 EXPORT_SYMBOL(iscsit_logout_post_handler); 4729 iscsit_fail_session(struct iscsit_session * sess)4730 void iscsit_fail_session(struct iscsit_session *sess) 4731 { 4732 struct iscsit_conn *conn; 4733 4734 spin_lock_bh(&sess->conn_lock); 4735 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 4736 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); 4737 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; 4738 } 4739 spin_unlock_bh(&sess->conn_lock); 4740 4741 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n"); 4742 sess->session_state = TARG_SESS_STATE_FAILED; 4743 } 4744 iscsit_stop_session(struct iscsit_session * sess,int session_sleep,int connection_sleep)4745 void iscsit_stop_session( 4746 struct iscsit_session *sess, 4747 int session_sleep, 4748 int connection_sleep) 4749 { 4750 u16 conn_count = atomic_read(&sess->nconn); 4751 struct iscsit_conn *conn, *conn_tmp = NULL; 4752 int is_last; 4753 4754 spin_lock_bh(&sess->conn_lock); 4755 4756 if (connection_sleep) { 4757 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list, 4758 conn_list) { 4759 if (conn_count == 0) 4760 break; 4761 4762 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) { 4763 is_last = 1; 4764 } else { 4765 iscsit_inc_conn_usage_count(conn_tmp); 4766 is_last = 0; 4767 } 4768 iscsit_inc_conn_usage_count(conn); 4769 4770 spin_unlock_bh(&sess->conn_lock); 4771 iscsit_cause_connection_reinstatement(conn, 1); 4772 spin_lock_bh(&sess->conn_lock); 4773 4774 iscsit_dec_conn_usage_count(conn); 4775 if (is_last == 0) 4776 iscsit_dec_conn_usage_count(conn_tmp); 4777 conn_count--; 4778 } 4779 } else { 4780 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 4781 iscsit_cause_connection_reinstatement(conn, 0); 4782 } 4783 4784 if (session_sleep && atomic_read(&sess->nconn)) { 4785 spin_unlock_bh(&sess->conn_lock); 4786 wait_for_completion(&sess->session_wait_comp); 4787 } else 4788 spin_unlock_bh(&sess->conn_lock); 4789 } 4790 iscsit_release_sessions_for_tpg(struct iscsi_portal_group * tpg,int force)4791 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force) 4792 { 4793 struct iscsit_session *sess; 4794 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 4795 struct se_session *se_sess, *se_sess_tmp; 4796 LIST_HEAD(free_list); 4797 int session_count = 0; 4798 4799 spin_lock_bh(&se_tpg->session_lock); 4800 if (tpg->nsessions && !force) { 4801 spin_unlock_bh(&se_tpg->session_lock); 4802 return -1; 4803 } 4804 4805 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 4806 sess_list) { 4807 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4808 4809 spin_lock(&sess->conn_lock); 4810 if (atomic_read(&sess->session_fall_back_to_erl0) || 4811 atomic_read(&sess->session_logout) || 4812 atomic_read(&sess->session_close) || 4813 (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 4814 spin_unlock(&sess->conn_lock); 4815 continue; 4816 } 4817 iscsit_inc_session_usage_count(sess); 4818 atomic_set(&sess->session_reinstatement, 1); 4819 atomic_set(&sess->session_fall_back_to_erl0, 1); 4820 atomic_set(&sess->session_close, 1); 4821 spin_unlock(&sess->conn_lock); 4822 4823 list_move_tail(&se_sess->sess_list, &free_list); 4824 } 4825 spin_unlock_bh(&se_tpg->session_lock); 4826 4827 list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) { 4828 sess = (struct iscsit_session *)se_sess->fabric_sess_ptr; 4829 4830 list_del_init(&se_sess->sess_list); 4831 iscsit_stop_session(sess, 1, 1); 4832 iscsit_dec_session_usage_count(sess); 4833 session_count++; 4834 } 4835 4836 pr_debug("Released %d iSCSI Session(s) from Target Portal" 4837 " Group: %hu\n", session_count, tpg->tpgt); 4838 return 0; 4839 } 4840 4841 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure"); 4842 MODULE_VERSION("4.1.x"); 4843 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 4844 MODULE_LICENSE("GPL"); 4845 4846 module_init(iscsi_target_init_module); 4847 module_exit(iscsi_target_cleanup_module); 4848