drivers/target/iscsi/iscsi_target.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains main functions related to the iSCSI Target Core Driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/string.h>
  13 #include <linux/kthread.h>
  14 #include <linux/completion.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/idr.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched/signal.h>
  20 #include <asm/unaligned.h>
  21 #include <linux/inet.h>
  22 #include <net/ipv6.h>
  23 #include <scsi/scsi_proto.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <scsi/scsi_tcq.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include <target/iscsi/iscsi_target_core.h>
  30 #include "iscsi_target_parameters.h"
  31 #include "iscsi_target_seq_pdu_list.h"
  32 #include "iscsi_target_datain_values.h"
  33 #include "iscsi_target_erl0.h"
  34 #include "iscsi_target_erl1.h"
  35 #include "iscsi_target_erl2.h"
  36 #include "iscsi_target_login.h"
  37 #include "iscsi_target_tmr.h"
  38 #include "iscsi_target_tpg.h"
  39 #include "iscsi_target_util.h"
  40 #include "iscsi_target.h"
  41 #include "iscsi_target_device.h"
  42 #include <target/iscsi/iscsi_target_stat.h>
  43
  44 #include <target/iscsi/iscsi_transport.h>
  45
  46 static LIST_HEAD(g_tiqn_list);
  47 static LIST_HEAD(g_np_list);
  48 static DEFINE_SPINLOCK(tiqn_lock);
  49 static DEFINE_MUTEX(np_lock);
  50
  51 static struct idr tiqn_idr;
  52 DEFINE_IDA(sess_ida);
  53 struct mutex auth_id_lock;
  54
  55 struct iscsit_global *iscsit_global;
  56
  57 struct kmem_cache *lio_qr_cache;
  58 struct kmem_cache *lio_dr_cache;
  59 struct kmem_cache *lio_ooo_cache;
  60 struct kmem_cache *lio_r2t_cache;
  61
  62 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  63                         struct iscsi_scsi_req *, u32);
  64
  65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  66 {
  67         struct iscsi_tiqn *tiqn = NULL;
  68
  69         spin_lock(&tiqn_lock);
  70         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  71                 if (!strcmp(tiqn->tiqn, buf)) {
  72
  73                         spin_lock(&tiqn->tiqn_state_lock);
  74                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  75                                 tiqn->tiqn_access_count++;
  76                                 spin_unlock(&tiqn->tiqn_state_lock);
  77                                 spin_unlock(&tiqn_lock);
  78                                 return tiqn;
  79                         }
  80                         spin_unlock(&tiqn->tiqn_state_lock);
  81                 }
  82         }
  83         spin_unlock(&tiqn_lock);
  84
  85         return NULL;
  86 }
  87
  88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  89 {
  90         spin_lock(&tiqn->tiqn_state_lock);
  91         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  92                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  93                 spin_unlock(&tiqn->tiqn_state_lock);
  94                 return 0;
  95         }
  96         spin_unlock(&tiqn->tiqn_state_lock);
  97
  98         return -1;
  99 }
 100
 101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 102 {
 103         spin_lock(&tiqn->tiqn_state_lock);
 104         tiqn->tiqn_access_count--;
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106 }
 107
 108 /*
 109  * Note that IQN formatting is expected to be done in userspace, and
 110  * no explict IQN format checks are done here.
 111  */
 112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 113 {
 114         struct iscsi_tiqn *tiqn = NULL;
 115         int ret;
 116
 117         if (strlen(buf) >= ISCSI_IQN_LEN) {
 118                 pr_err("Target IQN exceeds %d bytes\n",
 119                                 ISCSI_IQN_LEN);
 120                 return ERR_PTR(-EINVAL);
 121         }
 122
 123         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 124         if (!tiqn)
 125                 return ERR_PTR(-ENOMEM);
 126
 127         sprintf(tiqn->tiqn, "%s", buf);
 128         INIT_LIST_HEAD(&tiqn->tiqn_list);
 129         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 130         spin_lock_init(&tiqn->tiqn_state_lock);
 131         spin_lock_init(&tiqn->tiqn_tpg_lock);
 132         spin_lock_init(&tiqn->sess_err_stats.lock);
 133         spin_lock_init(&tiqn->login_stats.lock);
 134         spin_lock_init(&tiqn->logout_stats.lock);
 135
 136         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 137
 138         idr_preload(GFP_KERNEL);
 139         spin_lock(&tiqn_lock);
 140
 141         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 142         if (ret < 0) {
 143                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 144                 spin_unlock(&tiqn_lock);
 145                 idr_preload_end();
 146                 kfree(tiqn);
 147                 return ERR_PTR(ret);
 148         }
 149         tiqn->tiqn_index = ret;
 150         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 151
 152         spin_unlock(&tiqn_lock);
 153         idr_preload_end();
 154
 155         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 156
 157         return tiqn;
 158
 159 }
 160
 161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 162 {
 163         /*
 164          * Wait for accesses to said struct iscsi_tiqn to end.
 165          */
 166         spin_lock(&tiqn->tiqn_state_lock);
 167         while (tiqn->tiqn_access_count != 0) {
 168                 spin_unlock(&tiqn->tiqn_state_lock);
 169                 msleep(10);
 170                 spin_lock(&tiqn->tiqn_state_lock);
 171         }
 172         spin_unlock(&tiqn->tiqn_state_lock);
 173 }
 174
 175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 176 {
 177         /*
 178          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 179          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 180          * attempts to access this struct iscsi_tiqn will fail from both transport
 181          * fabric and control code paths.
 182          */
 183         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 184                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 185                 return;
 186         }
 187
 188         iscsit_wait_for_tiqn(tiqn);
 189
 190         spin_lock(&tiqn_lock);
 191         list_del(&tiqn->tiqn_list);
 192         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 193         spin_unlock(&tiqn_lock);
 194
 195         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 196                         tiqn->tiqn);
 197         kfree(tiqn);
 198 }
 199
 200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 201 {
 202         int ret;
 203         /*
 204          * Determine if the network portal is accepting storage traffic.
 205          */
 206         spin_lock_bh(&np->np_thread_lock);
 207         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 208                 spin_unlock_bh(&np->np_thread_lock);
 209                 return -1;
 210         }
 211         spin_unlock_bh(&np->np_thread_lock);
 212         /*
 213          * Determine if the portal group is accepting storage traffic.
 214          */
 215         spin_lock_bh(&tpg->tpg_state_lock);
 216         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 217                 spin_unlock_bh(&tpg->tpg_state_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&tpg->tpg_state_lock);
 221
 222         /*
 223          * Here we serialize access across the TIQN+TPG Tuple.
 224          */
 225         ret = down_interruptible(&tpg->np_login_sem);
 226         if (ret != 0)
 227                 return -1;
 228
 229         spin_lock_bh(&tpg->tpg_state_lock);
 230         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 231                 spin_unlock_bh(&tpg->tpg_state_lock);
 232                 up(&tpg->np_login_sem);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         return 0;
 238 }
 239
 240 void iscsit_login_kref_put(struct kref *kref)
 241 {
 242         struct iscsi_tpg_np *tpg_np = container_of(kref,
 243                                 struct iscsi_tpg_np, tpg_np_kref);
 244
 245         complete(&tpg_np->tpg_np_comp);
 246 }
 247
 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 249                        struct iscsi_tpg_np *tpg_np)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         up(&tpg->np_login_sem);
 254
 255         if (tpg_np)
 256                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 257
 258         if (tiqn)
 259                 iscsit_put_tiqn_for_login(tiqn);
 260
 261         return 0;
 262 }
 263
 264 bool iscsit_check_np_match(
 265         struct sockaddr_storage *sockaddr,
 266         struct iscsi_np *np,
 267         int network_transport)
 268 {
 269         struct sockaddr_in *sock_in, *sock_in_e;
 270         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 271         bool ip_match = false;
 272         u16 port, port_e;
 273
 274         if (sockaddr->ss_family == AF_INET6) {
 275                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 276                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 277
 278                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 279                             &sock_in6_e->sin6_addr.in6_u,
 280                             sizeof(struct in6_addr)))
 281                         ip_match = true;
 282
 283                 port = ntohs(sock_in6->sin6_port);
 284                 port_e = ntohs(sock_in6_e->sin6_port);
 285         } else {
 286                 sock_in = (struct sockaddr_in *)sockaddr;
 287                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 288
 289                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in->sin_port);
 293                 port_e = ntohs(sock_in_e->sin_port);
 294         }
 295
 296         if (ip_match && (port_e == port) &&
 297             (np->np_network_transport == network_transport))
 298                 return true;
 299
 300         return false;
 301 }
 302
 303 static struct iscsi_np *iscsit_get_np(
 304         struct sockaddr_storage *sockaddr,
 305         int network_transport)
 306 {
 307         struct iscsi_np *np;
 308         bool match;
 309
 310         lockdep_assert_held(&np_lock);
 311
 312         list_for_each_entry(np, &g_np_list, np_list) {
 313                 spin_lock_bh(&np->np_thread_lock);
 314                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 315                         spin_unlock_bh(&np->np_thread_lock);
 316                         continue;
 317                 }
 318
 319                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 320                 if (match) {
 321                         /*
 322                          * Increment the np_exports reference count now to
 323                          * prevent iscsit_del_np() below from being called
 324                          * while iscsi_tpg_add_network_portal() is called.
 325                          */
 326                         np->np_exports++;
 327                         spin_unlock_bh(&np->np_thread_lock);
 328                         return np;
 329                 }
 330                 spin_unlock_bh(&np->np_thread_lock);
 331         }
 332
 333         return NULL;
 334 }
 335
 336 struct iscsi_np *iscsit_add_np(
 337         struct sockaddr_storage *sockaddr,
 338         int network_transport)
 339 {
 340         struct iscsi_np *np;
 341         int ret;
 342
 343         mutex_lock(&np_lock);
 344
 345         /*
 346          * Locate the existing struct iscsi_np if already active..
 347          */
 348         np = iscsit_get_np(sockaddr, network_transport);
 349         if (np) {
 350                 mutex_unlock(&np_lock);
 351                 return np;
 352         }
 353
 354         np = kzalloc(sizeof(*np), GFP_KERNEL);
 355         if (!np) {
 356                 mutex_unlock(&np_lock);
 357                 return ERR_PTR(-ENOMEM);
 358         }
 359
 360         np->np_flags |= NPF_IP_NETWORK;
 361         np->np_network_transport = network_transport;
 362         spin_lock_init(&np->np_thread_lock);
 363         init_completion(&np->np_restart_comp);
 364         INIT_LIST_HEAD(&np->np_list);
 365
 366         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 367
 368         ret = iscsi_target_setup_login_socket(np, sockaddr);
 369         if (ret != 0) {
 370                 kfree(np);
 371                 mutex_unlock(&np_lock);
 372                 return ERR_PTR(ret);
 373         }
 374
 375         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 376         if (IS_ERR(np->np_thread)) {
 377                 pr_err("Unable to create kthread: iscsi_np\n");
 378                 ret = PTR_ERR(np->np_thread);
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383         /*
 384          * Increment the np_exports reference count now to prevent
 385          * iscsit_del_np() below from being run while a new call to
 386          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 387          * active.  We don't need to hold np->np_thread_lock at this
 388          * point because iscsi_np has not been added to g_np_list yet.
 389          */
 390         np->np_exports = 1;
 391         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 392
 393         list_add_tail(&np->np_list, &g_np_list);
 394         mutex_unlock(&np_lock);
 395
 396         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 397                 &np->np_sockaddr, np->np_transport->name);
 398
 399         return np;
 400 }
 401
 402 int iscsit_reset_np_thread(
 403         struct iscsi_np *np,
 404         struct iscsi_tpg_np *tpg_np,
 405         struct iscsi_portal_group *tpg,
 406         bool shutdown)
 407 {
 408         spin_lock_bh(&np->np_thread_lock);
 409         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 410                 spin_unlock_bh(&np->np_thread_lock);
 411                 return 0;
 412         }
 413         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 414         atomic_inc(&np->np_reset_count);
 415
 416         if (np->np_thread) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 send_sig(SIGINT, np->np_thread, 1);
 419                 wait_for_completion(&np->np_restart_comp);
 420                 spin_lock_bh(&np->np_thread_lock);
 421         }
 422         spin_unlock_bh(&np->np_thread_lock);
 423
 424         if (tpg_np && shutdown) {
 425                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 426
 427                 wait_for_completion(&tpg_np->tpg_np_comp);
 428         }
 429
 430         return 0;
 431 }
 432
 433 static void iscsit_free_np(struct iscsi_np *np)
 434 {
 435         if (np->np_socket)
 436                 sock_release(np->np_socket);
 437 }
 438
 439 int iscsit_del_np(struct iscsi_np *np)
 440 {
 441         spin_lock_bh(&np->np_thread_lock);
 442         np->np_exports--;
 443         if (np->np_exports) {
 444                 np->enabled = true;
 445                 spin_unlock_bh(&np->np_thread_lock);
 446                 return 0;
 447         }
 448         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 449         spin_unlock_bh(&np->np_thread_lock);
 450
 451         if (np->np_thread) {
 452                 /*
 453                  * We need to send the signal to wakeup Linux/Net
 454                  * which may be sleeping in sock_accept()..
 455                  */
 456                 send_sig(SIGINT, np->np_thread, 1);
 457                 kthread_stop(np->np_thread);
 458                 np->np_thread = NULL;
 459         }
 460
 461         np->np_transport->iscsit_free_np(np);
 462
 463         mutex_lock(&np_lock);
 464         list_del(&np->np_list);
 465         mutex_unlock(&np_lock);
 466
 467         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 468                 &np->np_sockaddr, np->np_transport->name);
 469
 470         iscsit_put_transport(np->np_transport);
 471         kfree(np);
 472         return 0;
 473 }
 474
 475 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 476
 477 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 478 {
 479         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 480 }
 481 EXPORT_SYMBOL(iscsit_queue_rsp);
 482
 483 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 484 {
 485         spin_lock_bh(&conn->cmd_lock);
 486         if (!list_empty(&cmd->i_conn_node))
 487                 list_del_init(&cmd->i_conn_node);
 488         spin_unlock_bh(&conn->cmd_lock);
 489
 490         __iscsit_free_cmd(cmd, true);
 491 }
 492 EXPORT_SYMBOL(iscsit_aborted_task);
 493
 494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 495                                       u32, u32, const void *, void *);
 496 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 497
 498 static int
 499 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 500                           const void *data_buf, u32 data_buf_len)
 501 {
 502         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 503         struct kvec *iov;
 504         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 505         int ret;
 506
 507         iov = &cmd->iov_misc[0];
 508         iov[niov].iov_base      = cmd->pdu;
 509         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 510
 511         if (conn->conn_ops->HeaderDigest) {
 512                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 513
 514                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 515                                           ISCSI_HDR_LEN, 0, NULL,
 516                                           header_digest);
 517
 518                 iov[0].iov_len += ISCSI_CRC_LEN;
 519                 tx_size += ISCSI_CRC_LEN;
 520                 pr_debug("Attaching CRC32C HeaderDigest"
 521                          " to opcode 0x%x 0x%08x\n",
 522                          hdr->opcode, *header_digest);
 523         }
 524
 525         if (data_buf_len) {
 526                 u32 padding = ((-data_buf_len) & 3);
 527
 528                 iov[niov].iov_base      = (void *)data_buf;
 529                 iov[niov++].iov_len     = data_buf_len;
 530                 tx_size += data_buf_len;
 531
 532                 if (padding != 0) {
 533                         iov[niov].iov_base = &cmd->pad_bytes;
 534                         iov[niov++].iov_len = padding;
 535                         tx_size += padding;
 536                         pr_debug("Attaching %u additional"
 537                                  " padding bytes.\n", padding);
 538                 }
 539
 540                 if (conn->conn_ops->DataDigest) {
 541                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 542                                                   data_buf, data_buf_len,
 543                                                   padding, &cmd->pad_bytes,
 544                                                   &cmd->data_crc);
 545
 546                         iov[niov].iov_base = &cmd->data_crc;
 547                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 548                         tx_size += ISCSI_CRC_LEN;
 549                         pr_debug("Attached DataDigest for %u"
 550                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 551                                  data_buf_len, hdr->opcode, cmd->data_crc);
 552                 }
 553         }
 554
 555         cmd->iov_misc_count = niov;
 556         cmd->tx_size = tx_size;
 557
 558         ret = iscsit_send_tx_data(cmd, conn, 1);
 559         if (ret < 0) {
 560                 iscsit_tx_thread_wait_for_tcp(conn);
 561                 return ret;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
 568                             u32 data_offset, u32 data_length);
 569 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 571                                     u32, u32, u32, u8 *);
 572 static int
 573 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 574                        const struct iscsi_datain *datain)
 575 {
 576         struct kvec *iov;
 577         u32 iov_count = 0, tx_size = 0;
 578         int ret, iov_ret;
 579
 580         iov = &cmd->iov_data[0];
 581         iov[iov_count].iov_base = cmd->pdu;
 582         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 583         tx_size += ISCSI_HDR_LEN;
 584
 585         if (conn->conn_ops->HeaderDigest) {
 586                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 587
 588                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 589                                           ISCSI_HDR_LEN, 0, NULL,
 590                                           header_digest);
 591
 592                 iov[0].iov_len += ISCSI_CRC_LEN;
 593                 tx_size += ISCSI_CRC_LEN;
 594
 595                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 596                          *header_digest);
 597         }
 598
 599         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
 600                                    cmd->orig_iov_data_count - (iov_count + 2),
 601                                    datain->offset, datain->length);
 602         if (iov_ret < 0)
 603                 return -1;
 604
 605         iov_count += iov_ret;
 606         tx_size += datain->length;
 607
 608         cmd->padding = ((-datain->length) & 3);
 609         if (cmd->padding) {
 610                 iov[iov_count].iov_base         = cmd->pad_bytes;
 611                 iov[iov_count++].iov_len        = cmd->padding;
 612                 tx_size += cmd->padding;
 613
 614                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 615         }
 616
 617         if (conn->conn_ops->DataDigest) {
 618                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 619                                                          cmd, datain->offset,
 620                                                          datain->length,
 621                                                          cmd->padding,
 622                                                          cmd->pad_bytes);
 623
 624                 iov[iov_count].iov_base = &cmd->data_crc;
 625                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 626                 tx_size += ISCSI_CRC_LEN;
 627
 628                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 629                          datain->length + cmd->padding, cmd->data_crc);
 630         }
 631
 632         cmd->iov_data_count = iov_count;
 633         cmd->tx_size = tx_size;
 634
 635         ret = iscsit_fe_sendpage_sg(cmd, conn);
 636
 637         iscsit_unmap_iovec(cmd);
 638
 639         if (ret < 0) {
 640                 iscsit_tx_thread_wait_for_tcp(conn);
 641                 return ret;
 642         }
 643
 644         return 0;
 645 }
 646
 647 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 648                            struct iscsi_datain_req *dr, const void *buf,
 649                            u32 buf_len)
 650 {
 651         if (dr)
 652                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 653         else
 654                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 655 }
 656
 657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 658 {
 659         return TARGET_PROT_NORMAL;
 660 }
 661
 662 static struct iscsit_transport iscsi_target_transport = {
 663         .name                   = "iSCSI/TCP",
 664         .transport_type         = ISCSI_TCP,
 665         .rdma_shutdown          = false,
 666         .owner                  = NULL,
 667         .iscsit_setup_np        = iscsit_setup_np,
 668         .iscsit_accept_np       = iscsit_accept_np,
 669         .iscsit_free_np         = iscsit_free_np,
 670         .iscsit_get_login_rx    = iscsit_get_login_rx,
 671         .iscsit_put_login_tx    = iscsit_put_login_tx,
 672         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 673         .iscsit_immediate_queue = iscsit_immediate_queue,
 674         .iscsit_response_queue  = iscsit_response_queue,
 675         .iscsit_queue_data_in   = iscsit_queue_rsp,
 676         .iscsit_queue_status    = iscsit_queue_rsp,
 677         .iscsit_aborted_task    = iscsit_aborted_task,
 678         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 679         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 680         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 681 };
 682
 683 static int __init iscsi_target_init_module(void)
 684 {
 685         int ret = 0, size;
 686
 687         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 688         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 689         if (!iscsit_global)
 690                 return -1;
 691
 692         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 693         mutex_init(&auth_id_lock);
 694         idr_init(&tiqn_idr);
 695
 696         ret = target_register_template(&iscsi_ops);
 697         if (ret)
 698                 goto out;
 699
 700         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 701         iscsit_global->ts_bitmap = vzalloc(size);
 702         if (!iscsit_global->ts_bitmap)
 703                 goto configfs_out;
 704
 705         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 706                         sizeof(struct iscsi_queue_req),
 707                         __alignof__(struct iscsi_queue_req), 0, NULL);
 708         if (!lio_qr_cache) {
 709                 pr_err("Unable to kmem_cache_create() for"
 710                                 " lio_qr_cache\n");
 711                 goto bitmap_out;
 712         }
 713
 714         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 715                         sizeof(struct iscsi_datain_req),
 716                         __alignof__(struct iscsi_datain_req), 0, NULL);
 717         if (!lio_dr_cache) {
 718                 pr_err("Unable to kmem_cache_create() for"
 719                                 " lio_dr_cache\n");
 720                 goto qr_out;
 721         }
 722
 723         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 724                         sizeof(struct iscsi_ooo_cmdsn),
 725                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 726         if (!lio_ooo_cache) {
 727                 pr_err("Unable to kmem_cache_create() for"
 728                                 " lio_ooo_cache\n");
 729                 goto dr_out;
 730         }
 731
 732         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 733                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 734                         0, NULL);
 735         if (!lio_r2t_cache) {
 736                 pr_err("Unable to kmem_cache_create() for"
 737                                 " lio_r2t_cache\n");
 738                 goto ooo_out;
 739         }
 740
 741         iscsit_register_transport(&iscsi_target_transport);
 742
 743         if (iscsit_load_discovery_tpg() < 0)
 744                 goto r2t_out;
 745
 746         return ret;
 747 r2t_out:
 748         iscsit_unregister_transport(&iscsi_target_transport);
 749         kmem_cache_destroy(lio_r2t_cache);
 750 ooo_out:
 751         kmem_cache_destroy(lio_ooo_cache);
 752 dr_out:
 753         kmem_cache_destroy(lio_dr_cache);
 754 qr_out:
 755         kmem_cache_destroy(lio_qr_cache);
 756 bitmap_out:
 757         vfree(iscsit_global->ts_bitmap);
 758 configfs_out:
 759         /* XXX: this probably wants it to be it's own unwind step.. */
 760         if (iscsit_global->discovery_tpg)
 761                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 762         target_unregister_template(&iscsi_ops);
 763 out:
 764         kfree(iscsit_global);
 765         return -ENOMEM;
 766 }
 767
 768 static void __exit iscsi_target_cleanup_module(void)
 769 {
 770         iscsit_release_discovery_tpg();
 771         iscsit_unregister_transport(&iscsi_target_transport);
 772         kmem_cache_destroy(lio_qr_cache);
 773         kmem_cache_destroy(lio_dr_cache);
 774         kmem_cache_destroy(lio_ooo_cache);
 775         kmem_cache_destroy(lio_r2t_cache);
 776
 777         /*
 778          * Shutdown discovery sessions and disable discovery TPG
 779          */
 780         if (iscsit_global->discovery_tpg)
 781                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 782
 783         target_unregister_template(&iscsi_ops);
 784
 785         vfree(iscsit_global->ts_bitmap);
 786         kfree(iscsit_global);
 787 }
 788
 789 int iscsit_add_reject(
 790         struct iscsi_conn *conn,
 791         u8 reason,
 792         unsigned char *buf)
 793 {
 794         struct iscsi_cmd *cmd;
 795
 796         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 797         if (!cmd)
 798                 return -1;
 799
 800         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 801         cmd->reject_reason = reason;
 802
 803         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 804         if (!cmd->buf_ptr) {
 805                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 806                 iscsit_free_cmd(cmd, false);
 807                 return -1;
 808         }
 809
 810         spin_lock_bh(&conn->cmd_lock);
 811         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 812         spin_unlock_bh(&conn->cmd_lock);
 813
 814         cmd->i_state = ISTATE_SEND_REJECT;
 815         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 816
 817         return -1;
 818 }
 819 EXPORT_SYMBOL(iscsit_add_reject);
 820
 821 static int iscsit_add_reject_from_cmd(
 822         struct iscsi_cmd *cmd,
 823         u8 reason,
 824         bool add_to_conn,
 825         unsigned char *buf)
 826 {
 827         struct iscsi_conn *conn;
 828         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 829
 830         if (!cmd->conn) {
 831                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 832                                 cmd->init_task_tag);
 833                 return -1;
 834         }
 835         conn = cmd->conn;
 836
 837         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 838         cmd->reject_reason = reason;
 839
 840         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 841         if (!cmd->buf_ptr) {
 842                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 843                 iscsit_free_cmd(cmd, false);
 844                 return -1;
 845         }
 846
 847         if (add_to_conn) {
 848                 spin_lock_bh(&conn->cmd_lock);
 849                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 850                 spin_unlock_bh(&conn->cmd_lock);
 851         }
 852
 853         cmd->i_state = ISTATE_SEND_REJECT;
 854         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 855         /*
 856          * Perform the kref_put now if se_cmd has already been setup by
 857          * scsit_setup_scsi_cmd()
 858          */
 859         if (do_put) {
 860                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 861                 target_put_sess_cmd(&cmd->se_cmd);
 862         }
 863         return -1;
 864 }
 865
 866 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 867                                  unsigned char *buf)
 868 {
 869         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 870 }
 871
 872 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 873 {
 874         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 875 }
 876 EXPORT_SYMBOL(iscsit_reject_cmd);
 877
 878 /*
 879  * Map some portion of the allocated scatterlist to an iovec, suitable for
 880  * kernel sockets to copy data in/out.
 881  */
 882 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
 883                             u32 data_offset, u32 data_length)
 884 {
 885         u32 i = 0, orig_data_length = data_length;
 886         struct scatterlist *sg;
 887         unsigned int page_off;
 888
 889         /*
 890          * We know each entry in t_data_sg contains a page.
 891          */
 892         u32 ent = data_offset / PAGE_SIZE;
 893
 894         if (!data_length)
 895                 return 0;
 896
 897         if (ent >= cmd->se_cmd.t_data_nents) {
 898                 pr_err("Initial page entry out-of-bounds\n");
 899                 goto overflow;
 900         }
 901
 902         sg = &cmd->se_cmd.t_data_sg[ent];
 903         page_off = (data_offset % PAGE_SIZE);
 904
 905         cmd->first_data_sg = sg;
 906         cmd->first_data_sg_off = page_off;
 907
 908         while (data_length) {
 909                 u32 cur_len;
 910
 911                 if (WARN_ON_ONCE(!sg || i >= nvec))
 912                         goto overflow;
 913
 914                 cur_len = min_t(u32, data_length, sg->length - page_off);
 915
 916                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 917                 iov[i].iov_len = cur_len;
 918
 919                 data_length -= cur_len;
 920                 page_off = 0;
 921                 sg = sg_next(sg);
 922                 i++;
 923         }
 924
 925         cmd->kmapped_nents = i;
 926
 927         return i;
 928
 929 overflow:
 930         pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
 931                data_offset, orig_data_length, i, nvec);
 932         for_each_sg(cmd->se_cmd.t_data_sg, sg,
 933                     cmd->se_cmd.t_data_nents, i) {
 934                 pr_err("[%d] off %d len %d\n",
 935                        i, sg->offset, sg->length);
 936         }
 937         return -1;
 938 }
 939
 940 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 941 {
 942         u32 i;
 943         struct scatterlist *sg;
 944
 945         sg = cmd->first_data_sg;
 946
 947         for (i = 0; i < cmd->kmapped_nents; i++)
 948                 kunmap(sg_page(&sg[i]));
 949 }
 950
 951 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 952 {
 953         LIST_HEAD(ack_list);
 954         struct iscsi_cmd *cmd, *cmd_p;
 955
 956         conn->exp_statsn = exp_statsn;
 957
 958         if (conn->sess->sess_ops->RDMAExtensions)
 959                 return;
 960
 961         spin_lock_bh(&conn->cmd_lock);
 962         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 963                 spin_lock(&cmd->istate_lock);
 964                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 965                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 966                         cmd->i_state = ISTATE_REMOVE;
 967                         spin_unlock(&cmd->istate_lock);
 968                         list_move_tail(&cmd->i_conn_node, &ack_list);
 969                         continue;
 970                 }
 971                 spin_unlock(&cmd->istate_lock);
 972         }
 973         spin_unlock_bh(&conn->cmd_lock);
 974
 975         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 976                 list_del_init(&cmd->i_conn_node);
 977                 iscsit_free_cmd(cmd, false);
 978         }
 979 }
 980
 981 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 982 {
 983         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 984
 985         iov_count += ISCSI_IOV_DATA_BUFFER;
 986         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 987         if (!cmd->iov_data)
 988                 return -ENOMEM;
 989
 990         cmd->orig_iov_data_count = iov_count;
 991         return 0;
 992 }
 993
 994 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 995                           unsigned char *buf)
 996 {
 997         int data_direction, payload_length;
 998         struct iscsi_scsi_req *hdr;
 999         int iscsi_task_attr;
1000         int sam_task_attr;
1001
1002         atomic_long_inc(&conn->sess->cmd_pdus);
1003
1004         hdr                     = (struct iscsi_scsi_req *) buf;
1005         payload_length          = ntoh24(hdr->dlength);
1006
1007         /* FIXME; Add checks for AdditionalHeaderSegment */
1008
1009         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1010             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1011                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1012                                 " not set. Bad iSCSI Initiator.\n");
1013                 return iscsit_add_reject_cmd(cmd,
1014                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1015         }
1016
1017         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1018              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1019                 /*
1020                  * From RFC-3720 Section 10.3.1:
1021                  *
1022                  * "Either or both of R and W MAY be 1 when either the
1023                  *  Expected Data Transfer Length and/or Bidirectional Read
1024                  *  Expected Data Transfer Length are 0"
1025                  *
1026                  * For this case, go ahead and clear the unnecssary bits
1027                  * to avoid any confusion with ->data_direction.
1028                  */
1029                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1030                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1031
1032                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1033                         " set when Expected Data Transfer Length is 0 for"
1034                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1035         }
1036
1037         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1038             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1039                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1040                         " MUST be set if Expected Data Transfer Length is not 0."
1041                         " Bad iSCSI Initiator\n");
1042                 return iscsit_add_reject_cmd(cmd,
1043                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1044         }
1045
1046         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1047             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1048                 pr_err("Bidirectional operations not supported!\n");
1049                 return iscsit_add_reject_cmd(cmd,
1050                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1051         }
1052
1053         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1054                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1055                                 " Scsi Command PDU.\n");
1056                 return iscsit_add_reject_cmd(cmd,
1057                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1058         }
1059
1060         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1061                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1062                         " protocol error.\n", payload_length);
1063                 return iscsit_add_reject_cmd(cmd,
1064                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1065         }
1066
1067         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1068             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1069                 pr_err("Expected Data Transfer Length and Length of"
1070                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1071                         " bit is not set protocol error\n");
1072                 return iscsit_add_reject_cmd(cmd,
1073                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1074         }
1075
1076         if (payload_length > be32_to_cpu(hdr->data_length)) {
1077                 pr_err("DataSegmentLength: %u is greater than"
1078                         " EDTL: %u, protocol error.\n", payload_length,
1079                                 hdr->data_length);
1080                 return iscsit_add_reject_cmd(cmd,
1081                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1082         }
1083
1084         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1085                 pr_err("DataSegmentLength: %u is greater than"
1086                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1087                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1088                 return iscsit_add_reject_cmd(cmd,
1089                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1090         }
1091
1092         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1093                 pr_err("DataSegmentLength: %u is greater than"
1094                         " FirstBurstLength: %u, protocol error.\n",
1095                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1096                 return iscsit_add_reject_cmd(cmd,
1097                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1098         }
1099
1100         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1101                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1102                           DMA_NONE;
1103
1104         cmd->data_direction = data_direction;
1105         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1106         /*
1107          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1108          */
1109         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1110             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1111                 sam_task_attr = TCM_SIMPLE_TAG;
1112         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1113                 sam_task_attr = TCM_ORDERED_TAG;
1114         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1115                 sam_task_attr = TCM_HEAD_TAG;
1116         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1117                 sam_task_attr = TCM_ACA_TAG;
1118         else {
1119                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1120                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1121                 sam_task_attr = TCM_SIMPLE_TAG;
1122         }
1123
1124         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1125         cmd->i_state            = ISTATE_NEW_CMD;
1126         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1127         cmd->immediate_data     = (payload_length) ? 1 : 0;
1128         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1129                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1130         if (cmd->unsolicited_data)
1131                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1132
1133         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1134         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1135                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1136         else
1137                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1138         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1139         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1140         cmd->first_burst_len    = payload_length;
1141
1142         if (!conn->sess->sess_ops->RDMAExtensions &&
1143              cmd->data_direction == DMA_FROM_DEVICE) {
1144                 struct iscsi_datain_req *dr;
1145
1146                 dr = iscsit_allocate_datain_req();
1147                 if (!dr)
1148                         return iscsit_add_reject_cmd(cmd,
1149                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1150
1151                 iscsit_attach_datain_req(cmd, dr);
1152         }
1153
1154         /*
1155          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1156          */
1157         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1158                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1159                         cmd->data_direction, sam_task_attr,
1160                         cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1161
1162         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1163                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1164                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1165                 conn->cid);
1166
1167         target_get_sess_cmd(&cmd->se_cmd, true);
1168
1169         cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb);
1170         if (cmd->sense_reason) {
1171                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172                         return iscsit_add_reject_cmd(cmd,
1173                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174                 }
1175
1176                 goto attach_cmd;
1177         }
1178
1179         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1180         if (cmd->sense_reason)
1181                 goto attach_cmd;
1182
1183         /* only used for printks or comparing with ->ref_task_tag */
1184         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1185         cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1186         if (cmd->sense_reason)
1187                 goto attach_cmd;
1188
1189         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1190                 return iscsit_add_reject_cmd(cmd,
1191                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1192         }
1193
1194 attach_cmd:
1195         spin_lock_bh(&conn->cmd_lock);
1196         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1197         spin_unlock_bh(&conn->cmd_lock);
1198         /*
1199          * Check if we need to delay processing because of ALUA
1200          * Active/NonOptimized primary access state..
1201          */
1202         core_alua_check_nonop_delay(&cmd->se_cmd);
1203
1204         return 0;
1205 }
1206 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1207
1208 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1209 {
1210         iscsit_set_dataout_sequence_values(cmd);
1211
1212         spin_lock_bh(&cmd->dataout_timeout_lock);
1213         iscsit_start_dataout_timer(cmd, cmd->conn);
1214         spin_unlock_bh(&cmd->dataout_timeout_lock);
1215 }
1216 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1217
1218 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1219                             struct iscsi_scsi_req *hdr)
1220 {
1221         int cmdsn_ret = 0;
1222         /*
1223          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1224          * the Immediate Bit is not set, and no Immediate
1225          * Data is attached.
1226          *
1227          * A PDU/CmdSN carrying Immediate Data can only
1228          * be processed after the DataCRC has passed.
1229          * If the DataCRC fails, the CmdSN MUST NOT
1230          * be acknowledged. (See below)
1231          */
1232         if (!cmd->immediate_data) {
1233                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1234                                         (unsigned char *)hdr, hdr->cmdsn);
1235                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1236                         return -1;
1237                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1238                         target_put_sess_cmd(&cmd->se_cmd);
1239                         return 0;
1240                 }
1241         }
1242
1243         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1244
1245         /*
1246          * If no Immediate Data is attached, it's OK to return now.
1247          */
1248         if (!cmd->immediate_data) {
1249                 if (!cmd->sense_reason && cmd->unsolicited_data)
1250                         iscsit_set_unsolicited_dataout(cmd);
1251                 if (!cmd->sense_reason)
1252                         return 0;
1253
1254                 target_put_sess_cmd(&cmd->se_cmd);
1255                 return 0;
1256         }
1257
1258         /*
1259          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1260          * execution.  These exceptions are processed in CmdSN order using
1261          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1262          */
1263         if (cmd->sense_reason)
1264                 return 1;
1265         /*
1266          * Call directly into transport_generic_new_cmd() to perform
1267          * the backend memory allocation.
1268          */
1269         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1270         if (cmd->sense_reason)
1271                 return 1;
1272
1273         return 0;
1274 }
1275 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1276
1277 static int
1278 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1279                           bool dump_payload)
1280 {
1281         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1282         int rc;
1283
1284         /*
1285          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1286          */
1287         if (dump_payload) {
1288                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1289                                  cmd->first_burst_len);
1290
1291                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1292                          cmd->se_cmd.data_length, cmd->write_data_done,
1293                          cmd->first_burst_len, length);
1294                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1295                 pr_debug("Finished dumping immediate data\n");
1296                 if (rc < 0)
1297                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1298         } else {
1299                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1300                                                          cmd->first_burst_len);
1301         }
1302
1303         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1304                 /*
1305                  * A PDU/CmdSN carrying Immediate Data passed
1306                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1307                  * Immediate Bit is not set.
1308                  */
1309                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1310                                         (unsigned char *)hdr, hdr->cmdsn);
1311                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1312                         return -1;
1313
1314                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1315                         target_put_sess_cmd(&cmd->se_cmd);
1316
1317                         return 0;
1318                 } else if (cmd->unsolicited_data)
1319                         iscsit_set_unsolicited_dataout(cmd);
1320
1321         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1322                 /*
1323                  * Immediate Data failed DataCRC and ERL>=1,
1324                  * silently drop this PDU and let the initiator
1325                  * plug the CmdSN gap.
1326                  *
1327                  * FIXME: Send Unsolicited NOPIN with reserved
1328                  * TTT here to help the initiator figure out
1329                  * the missing CmdSN, although they should be
1330                  * intelligent enough to determine the missing
1331                  * CmdSN and issue a retry to plug the sequence.
1332                  */
1333                 cmd->i_state = ISTATE_REMOVE;
1334                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1335         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1336                 return -1;
1337
1338         return 0;
1339 }
1340
1341 static int
1342 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1343                            unsigned char *buf)
1344 {
1345         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1346         int rc, immed_data;
1347         bool dump_payload = false;
1348
1349         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1350         if (rc < 0)
1351                 return 0;
1352         /*
1353          * Allocation iovecs needed for struct socket operations for
1354          * traditional iSCSI block I/O.
1355          */
1356         if (iscsit_allocate_iovecs(cmd) < 0) {
1357                 return iscsit_reject_cmd(cmd,
1358                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1359         }
1360         immed_data = cmd->immediate_data;
1361
1362         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1363         if (rc < 0)
1364                 return rc;
1365         else if (rc > 0)
1366                 dump_payload = true;
1367
1368         if (!immed_data)
1369                 return 0;
1370
1371         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1372 }
1373
1374 static u32 iscsit_do_crypto_hash_sg(
1375         struct ahash_request *hash,
1376         struct iscsi_cmd *cmd,
1377         u32 data_offset,
1378         u32 data_length,
1379         u32 padding,
1380         u8 *pad_bytes)
1381 {
1382         u32 data_crc;
1383         struct scatterlist *sg;
1384         unsigned int page_off;
1385
1386         crypto_ahash_init(hash);
1387
1388         sg = cmd->first_data_sg;
1389         page_off = cmd->first_data_sg_off;
1390
1391         if (data_length && page_off) {
1392                 struct scatterlist first_sg;
1393                 u32 len = min_t(u32, data_length, sg->length - page_off);
1394
1395                 sg_init_table(&first_sg, 1);
1396                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1397
1398                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1399                 crypto_ahash_update(hash);
1400
1401                 data_length -= len;
1402                 sg = sg_next(sg);
1403         }
1404
1405         while (data_length) {
1406                 u32 cur_len = min_t(u32, data_length, sg->length);
1407
1408                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1409                 crypto_ahash_update(hash);
1410
1411                 data_length -= cur_len;
1412                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1413                 sg = sg_next(sg);
1414         }
1415
1416         if (padding) {
1417                 struct scatterlist pad_sg;
1418
1419                 sg_init_one(&pad_sg, pad_bytes, padding);
1420                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1421                                         padding);
1422                 crypto_ahash_finup(hash);
1423         } else {
1424                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1425                 crypto_ahash_final(hash);
1426         }
1427
1428         return data_crc;
1429 }
1430
1431 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1432         const void *buf, u32 payload_length, u32 padding,
1433         const void *pad_bytes, void *data_crc)
1434 {
1435         struct scatterlist sg[2];
1436
1437         sg_init_table(sg, ARRAY_SIZE(sg));
1438         sg_set_buf(sg, buf, payload_length);
1439         if (padding)
1440                 sg_set_buf(sg + 1, pad_bytes, padding);
1441
1442         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1443
1444         crypto_ahash_digest(hash);
1445 }
1446
1447 int
1448 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1449                            struct iscsi_cmd *cmd, u32 payload_length,
1450                            bool *success)
1451 {
1452         struct iscsi_data *hdr = buf;
1453         struct se_cmd *se_cmd;
1454         int rc;
1455
1456         /* iSCSI write */
1457         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1458
1459         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1460                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1461                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1462                 payload_length, conn->cid);
1463
1464         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1465                 pr_err("Command ITT: 0x%08x received DataOUT after"
1466                         " last DataOUT received, dumping payload\n",
1467                         cmd->init_task_tag);
1468                 return iscsit_dump_data_payload(conn, payload_length, 1);
1469         }
1470
1471         if (cmd->data_direction != DMA_TO_DEVICE) {
1472                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1473                         " NON-WRITE command.\n", cmd->init_task_tag);
1474                 return iscsit_dump_data_payload(conn, payload_length, 1);
1475         }
1476         se_cmd = &cmd->se_cmd;
1477         iscsit_mod_dataout_timer(cmd);
1478
1479         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1480                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1481                        be32_to_cpu(hdr->offset), payload_length,
1482                        cmd->se_cmd.data_length);
1483                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1484         }
1485
1486         if (cmd->unsolicited_data) {
1487                 int dump_unsolicited_data = 0;
1488
1489                 if (conn->sess->sess_ops->InitialR2T) {
1490                         pr_err("Received unexpected unsolicited data"
1491                                 " while InitialR2T=Yes, protocol error.\n");
1492                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1493                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1494                         return -1;
1495                 }
1496                 /*
1497                  * Special case for dealing with Unsolicited DataOUT
1498                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1499                  * failures;
1500                  */
1501
1502                 /* Something's amiss if we're not in WRITE_PENDING state... */
1503                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1504                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1505                         dump_unsolicited_data = 1;
1506
1507                 if (dump_unsolicited_data) {
1508                         /*
1509                          * Check if a delayed TASK_ABORTED status needs to
1510                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1511                          * received with the unsolicited data out.
1512                          */
1513                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1514                                 iscsit_stop_dataout_timer(cmd);
1515
1516                         return iscsit_dump_data_payload(conn, payload_length, 1);
1517                 }
1518         } else {
1519                 /*
1520                  * For the normal solicited data path:
1521                  *
1522                  * Check for a delayed TASK_ABORTED status and dump any
1523                  * incoming data out payload if one exists.  Also, when the
1524                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1525                  * data out sequence, we decrement outstanding_r2ts.  Once
1526                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1527                  * TASK_ABORTED status.
1528                  */
1529                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1530                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1531                             --cmd->outstanding_r2ts < 1)
1532                                 iscsit_stop_dataout_timer(cmd);
1533
1534                         return iscsit_dump_data_payload(conn, payload_length, 1);
1535                 }
1536         }
1537         /*
1538          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1539          * within-command recovery checks before receiving the payload.
1540          */
1541         rc = iscsit_check_pre_dataout(cmd, buf);
1542         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1543                 return 0;
1544         else if (rc == DATAOUT_CANNOT_RECOVER)
1545                 return -1;
1546         *success = true;
1547         return 0;
1548 }
1549 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1550
1551 int
1552 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1553                          struct iscsi_cmd **out_cmd)
1554 {
1555         struct iscsi_data *hdr = buf;
1556         struct iscsi_cmd *cmd;
1557         u32 payload_length = ntoh24(hdr->dlength);
1558         int rc;
1559         bool success = false;
1560
1561         if (!payload_length) {
1562                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1563                 return 0;
1564         }
1565
1566         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1567                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1568                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1569                         conn->conn_ops->MaxXmitDataSegmentLength);
1570                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1571         }
1572
1573         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1574         if (!cmd)
1575                 return 0;
1576
1577         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1578
1579         if (success)
1580                 *out_cmd = cmd;
1581
1582         return rc;
1583 }
1584 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1585
1586 static int
1587 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                    struct iscsi_data *hdr)
1589 {
1590         struct kvec *iov;
1591         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1592         u32 payload_length;
1593         int iov_ret, data_crc_failed = 0;
1594
1595         payload_length = min_t(u32, cmd->se_cmd.data_length,
1596                                ntoh24(hdr->dlength));
1597         rx_size += payload_length;
1598         iov = &cmd->iov_data[0];
1599
1600         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1601                                    be32_to_cpu(hdr->offset), payload_length);
1602         if (iov_ret < 0)
1603                 return -1;
1604
1605         iov_count += iov_ret;
1606
1607         padding = ((-payload_length) & 3);
1608         if (padding != 0) {
1609                 iov[iov_count].iov_base = cmd->pad_bytes;
1610                 iov[iov_count++].iov_len = padding;
1611                 rx_size += padding;
1612                 pr_debug("Receiving %u padding bytes.\n", padding);
1613         }
1614
1615         if (conn->conn_ops->DataDigest) {
1616                 iov[iov_count].iov_base = &checksum;
1617                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1618                 rx_size += ISCSI_CRC_LEN;
1619         }
1620
1621         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1622         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1623
1624         iscsit_unmap_iovec(cmd);
1625
1626         if (rx_got != rx_size)
1627                 return -1;
1628
1629         if (conn->conn_ops->DataDigest) {
1630                 u32 data_crc;
1631
1632                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1633                                                     be32_to_cpu(hdr->offset),
1634                                                     payload_length, padding,
1635                                                     cmd->pad_bytes);
1636
1637                 if (checksum != data_crc) {
1638                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1639                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1640                                 " does not match computed 0x%08x\n",
1641                                 hdr->itt, hdr->offset, payload_length,
1642                                 hdr->datasn, checksum, data_crc);
1643                         data_crc_failed = 1;
1644                 } else {
1645                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1646                                 " %u bytes of Data Out\n", checksum,
1647                                 payload_length);
1648                 }
1649         }
1650
1651         return data_crc_failed;
1652 }
1653
1654 int
1655 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1656                              bool data_crc_failed)
1657 {
1658         struct iscsi_conn *conn = cmd->conn;
1659         int rc, ooo_cmdsn;
1660         /*
1661          * Increment post receive data and CRC values or perform
1662          * within-command recovery.
1663          */
1664         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1665         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1666                 return 0;
1667         else if (rc == DATAOUT_SEND_R2T) {
1668                 iscsit_set_dataout_sequence_values(cmd);
1669                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1670         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1671                 /*
1672                  * Handle extra special case for out of order
1673                  * Unsolicited Data Out.
1674                  */
1675                 spin_lock_bh(&cmd->istate_lock);
1676                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1677                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1678                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1679                 spin_unlock_bh(&cmd->istate_lock);
1680
1681                 iscsit_stop_dataout_timer(cmd);
1682                 if (ooo_cmdsn)
1683                         return 0;
1684                 target_execute_cmd(&cmd->se_cmd);
1685                 return 0;
1686         } else /* DATAOUT_CANNOT_RECOVER */
1687                 return -1;
1688
1689         return 0;
1690 }
1691 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1692
1693 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1694 {
1695         struct iscsi_cmd *cmd = NULL;
1696         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1697         int rc;
1698         bool data_crc_failed = false;
1699
1700         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1701         if (rc < 0)
1702                 return 0;
1703         else if (!cmd)
1704                 return 0;
1705
1706         rc = iscsit_get_dataout(conn, cmd, hdr);
1707         if (rc < 0)
1708                 return rc;
1709         else if (rc > 0)
1710                 data_crc_failed = true;
1711
1712         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1713 }
1714
1715 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1716                          struct iscsi_nopout *hdr)
1717 {
1718         u32 payload_length = ntoh24(hdr->dlength);
1719
1720         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1721                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1722                 if (!cmd)
1723                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724                                                  (unsigned char *)hdr);
1725
1726                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727                                          (unsigned char *)hdr);
1728         }
1729
1730         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1731                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1732                         " not set, protocol error.\n");
1733                 if (!cmd)
1734                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1735                                                  (unsigned char *)hdr);
1736
1737                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1738                                          (unsigned char *)hdr);
1739         }
1740
1741         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1742                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1743                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1744                         " error.\n", payload_length,
1745                         conn->conn_ops->MaxXmitDataSegmentLength);
1746                 if (!cmd)
1747                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1748                                                  (unsigned char *)hdr);
1749
1750                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1751                                          (unsigned char *)hdr);
1752         }
1753
1754         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1755                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1756                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1757                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1758                 payload_length);
1759         /*
1760          * This is not a response to a Unsolicited NopIN, which means
1761          * it can either be a NOPOUT ping request (with a valid ITT),
1762          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1763          * Either way, make sure we allocate an struct iscsi_cmd, as both
1764          * can contain ping data.
1765          */
1766         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1767                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1768                 cmd->i_state            = ISTATE_SEND_NOPIN;
1769                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1770                                                 1 : 0);
1771                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1772                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1773                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1774                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1775                 cmd->data_direction     = DMA_NONE;
1776         }
1777
1778         return 0;
1779 }
1780 EXPORT_SYMBOL(iscsit_setup_nop_out);
1781
1782 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1783                            struct iscsi_nopout *hdr)
1784 {
1785         struct iscsi_cmd *cmd_p = NULL;
1786         int cmdsn_ret = 0;
1787         /*
1788          * Initiator is expecting a NopIN ping reply..
1789          */
1790         if (hdr->itt != RESERVED_ITT) {
1791                 if (!cmd)
1792                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1793                                                 (unsigned char *)hdr);
1794
1795                 spin_lock_bh(&conn->cmd_lock);
1796                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1797                 spin_unlock_bh(&conn->cmd_lock);
1798
1799                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1800
1801                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1802                         iscsit_add_cmd_to_response_queue(cmd, conn,
1803                                                          cmd->i_state);
1804                         return 0;
1805                 }
1806
1807                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1808                                 (unsigned char *)hdr, hdr->cmdsn);
1809                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1810                         return 0;
1811                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1812                         return -1;
1813
1814                 return 0;
1815         }
1816         /*
1817          * This was a response to a unsolicited NOPIN ping.
1818          */
1819         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1820                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1821                 if (!cmd_p)
1822                         return -EINVAL;
1823
1824                 iscsit_stop_nopin_response_timer(conn);
1825
1826                 cmd_p->i_state = ISTATE_REMOVE;
1827                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1828
1829                 iscsit_start_nopin_timer(conn);
1830                 return 0;
1831         }
1832         /*
1833          * Otherwise, initiator is not expecting a NOPIN is response.
1834          * Just ignore for now.
1835          */
1836
1837         if (cmd)
1838                 iscsit_free_cmd(cmd, false);
1839
1840         return 0;
1841 }
1842 EXPORT_SYMBOL(iscsit_process_nop_out);
1843
1844 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1845                                  unsigned char *buf)
1846 {
1847         unsigned char *ping_data = NULL;
1848         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1849         struct kvec *iov = NULL;
1850         u32 payload_length = ntoh24(hdr->dlength);
1851         int ret;
1852
1853         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1854         if (ret < 0)
1855                 return 0;
1856         /*
1857          * Handle NOP-OUT payload for traditional iSCSI sockets
1858          */
1859         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1860                 u32 checksum, data_crc, padding = 0;
1861                 int niov = 0, rx_got, rx_size = payload_length;
1862
1863                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1864                 if (!ping_data) {
1865                         ret = -1;
1866                         goto out;
1867                 }
1868
1869                 iov = &cmd->iov_misc[0];
1870                 iov[niov].iov_base      = ping_data;
1871                 iov[niov++].iov_len     = payload_length;
1872
1873                 padding = ((-payload_length) & 3);
1874                 if (padding != 0) {
1875                         pr_debug("Receiving %u additional bytes"
1876                                 " for padding.\n", padding);
1877                         iov[niov].iov_base      = &cmd->pad_bytes;
1878                         iov[niov++].iov_len     = padding;
1879                         rx_size += padding;
1880                 }
1881                 if (conn->conn_ops->DataDigest) {
1882                         iov[niov].iov_base      = &checksum;
1883                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1884                         rx_size += ISCSI_CRC_LEN;
1885                 }
1886
1887                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1888                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1889                 if (rx_got != rx_size) {
1890                         ret = -1;
1891                         goto out;
1892                 }
1893
1894                 if (conn->conn_ops->DataDigest) {
1895                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1896                                                   payload_length, padding,
1897                                                   cmd->pad_bytes, &data_crc);
1898
1899                         if (checksum != data_crc) {
1900                                 pr_err("Ping data CRC32C DataDigest"
1901                                 " 0x%08x does not match computed 0x%08x\n",
1902                                         checksum, data_crc);
1903                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1904                                         pr_err("Unable to recover from"
1905                                         " NOPOUT Ping DataCRC failure while in"
1906                                                 " ERL=0.\n");
1907                                         ret = -1;
1908                                         goto out;
1909                                 } else {
1910                                         /*
1911                                          * Silently drop this PDU and let the
1912                                          * initiator plug the CmdSN gap.
1913                                          */
1914                                         pr_debug("Dropping NOPOUT"
1915                                         " Command CmdSN: 0x%08x due to"
1916                                         " DataCRC error.\n", hdr->cmdsn);
1917                                         ret = 0;
1918                                         goto out;
1919                                 }
1920                         } else {
1921                                 pr_debug("Got CRC32C DataDigest"
1922                                 " 0x%08x for %u bytes of ping data.\n",
1923                                         checksum, payload_length);
1924                         }
1925                 }
1926
1927                 ping_data[payload_length] = '\0';
1928                 /*
1929                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1930                  */
1931                 cmd->buf_ptr = ping_data;
1932                 cmd->buf_ptr_size = payload_length;
1933
1934                 pr_debug("Got %u bytes of NOPOUT ping"
1935                         " data.\n", payload_length);
1936                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1937         }
1938
1939         return iscsit_process_nop_out(conn, cmd, hdr);
1940 out:
1941         if (cmd)
1942                 iscsit_free_cmd(cmd, false);
1943
1944         kfree(ping_data);
1945         return ret;
1946 }
1947
1948 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1949 {
1950         switch (iscsi_tmf) {
1951         case ISCSI_TM_FUNC_ABORT_TASK:
1952                 return TMR_ABORT_TASK;
1953         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1954                 return TMR_ABORT_TASK_SET;
1955         case ISCSI_TM_FUNC_CLEAR_ACA:
1956                 return TMR_CLEAR_ACA;
1957         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1958                 return TMR_CLEAR_TASK_SET;
1959         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1960                 return TMR_LUN_RESET;
1961         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1962                 return TMR_TARGET_WARM_RESET;
1963         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1964                 return TMR_TARGET_COLD_RESET;
1965         default:
1966                 return TMR_UNKNOWN;
1967         }
1968 }
1969
1970 int
1971 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1972                            unsigned char *buf)
1973 {
1974         struct se_tmr_req *se_tmr;
1975         struct iscsi_tmr_req *tmr_req;
1976         struct iscsi_tm *hdr;
1977         int out_of_order_cmdsn = 0, ret;
1978         u8 function, tcm_function = TMR_UNKNOWN;
1979
1980         hdr                     = (struct iscsi_tm *) buf;
1981         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1982         function = hdr->flags;
1983
1984         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1985                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1986                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1987                 hdr->rtt, hdr->refcmdsn, conn->cid);
1988
1989         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1991              hdr->rtt != RESERVED_ITT)) {
1992                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1993                 hdr->rtt = RESERVED_ITT;
1994         }
1995
1996         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1997                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1998                 pr_err("Task Management Request TASK_REASSIGN not"
1999                         " issued as immediate command, bad iSCSI Initiator"
2000                                 "implementation\n");
2001                 return iscsit_add_reject_cmd(cmd,
2002                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2003         }
2004         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2005             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2006                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2007
2008         cmd->data_direction = DMA_NONE;
2009         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2010         if (!cmd->tmr_req) {
2011                 return iscsit_add_reject_cmd(cmd,
2012                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2013                                              buf);
2014         }
2015
2016         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2017                               conn->sess->se_sess, 0, DMA_NONE,
2018                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2019                               scsilun_to_int(&hdr->lun));
2020
2021         target_get_sess_cmd(&cmd->se_cmd, true);
2022
2023         /*
2024          * TASK_REASSIGN for ERL=2 / connection stays inside of
2025          * LIO-Target $FABRIC_MOD
2026          */
2027         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2028                 tcm_function = iscsit_convert_tmf(function);
2029                 if (tcm_function == TMR_UNKNOWN) {
2030                         pr_err("Unknown iSCSI TMR Function:"
2031                                " 0x%02x\n", function);
2032                         return iscsit_add_reject_cmd(cmd,
2033                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034                 }
2035         }
2036         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2037                                  GFP_KERNEL);
2038         if (ret < 0)
2039                 return iscsit_add_reject_cmd(cmd,
2040                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2041
2042         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2043
2044         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2045         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2046         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2047         cmd->init_task_tag      = hdr->itt;
2048         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2049         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2050         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2051         se_tmr                  = cmd->se_cmd.se_tmr_req;
2052         tmr_req                 = cmd->tmr_req;
2053         /*
2054          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2055          */
2056         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2057                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2058                 if (ret < 0) {
2059                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2060                         goto attach;
2061                 }
2062         }
2063
2064         switch (function) {
2065         case ISCSI_TM_FUNC_ABORT_TASK:
2066                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2067                 if (se_tmr->response)
2068                         goto attach;
2069                 break;
2070         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2071         case ISCSI_TM_FUNC_CLEAR_ACA:
2072         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2073         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2074                 break;
2075         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2076                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2077                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2078                         goto attach;
2079                 }
2080                 break;
2081         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2082                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2083                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2084                         goto attach;
2085                 }
2086                 break;
2087         case ISCSI_TM_FUNC_TASK_REASSIGN:
2088                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2089                 /*
2090                  * Perform sanity checks on the ExpDataSN only if the
2091                  * TASK_REASSIGN was successful.
2092                  */
2093                 if (se_tmr->response)
2094                         break;
2095
2096                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2097                         return iscsit_add_reject_cmd(cmd,
2098                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2099                 break;
2100         default:
2101                 pr_err("Unknown TMR function: 0x%02x, protocol"
2102                         " error.\n", function);
2103                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2104                 goto attach;
2105         }
2106
2107         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2108             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2109                 se_tmr->call_transport = 1;
2110 attach:
2111         spin_lock_bh(&conn->cmd_lock);
2112         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2113         spin_unlock_bh(&conn->cmd_lock);
2114
2115         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2116                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2117                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2118                         out_of_order_cmdsn = 1;
2119                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2120                         target_put_sess_cmd(&cmd->se_cmd);
2121                         return 0;
2122                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2123                         return -1;
2124                 }
2125         }
2126         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2127
2128         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2129                 return 0;
2130         /*
2131          * Found the referenced task, send to transport for processing.
2132          */
2133         if (se_tmr->call_transport)
2134                 return transport_generic_handle_tmr(&cmd->se_cmd);
2135
2136         /*
2137          * Could not find the referenced LUN, task, or Task Management
2138          * command not authorized or supported.  Change state and
2139          * let the tx_thread send the response.
2140          *
2141          * For connection recovery, this is also the default action for
2142          * TMR TASK_REASSIGN.
2143          */
2144         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2145         target_put_sess_cmd(&cmd->se_cmd);
2146         return 0;
2147 }
2148 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2149
2150 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2151 int
2152 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2153                       struct iscsi_text *hdr)
2154 {
2155         u32 payload_length = ntoh24(hdr->dlength);
2156
2157         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2158                 pr_err("Unable to accept text parameter length: %u"
2159                         "greater than MaxXmitDataSegmentLength %u.\n",
2160                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2161                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2162                                          (unsigned char *)hdr);
2163         }
2164
2165         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2166              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2167                 pr_err("Multi sequence text commands currently not supported\n");
2168                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2169                                         (unsigned char *)hdr);
2170         }
2171
2172         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2173                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2174                 hdr->exp_statsn, payload_length);
2175
2176         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2177         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2178         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2179         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2180         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2181         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2182         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2183         cmd->data_direction     = DMA_NONE;
2184         kfree(cmd->text_in_ptr);
2185         cmd->text_in_ptr        = NULL;
2186
2187         return 0;
2188 }
2189 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2190
2191 int
2192 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2193                         struct iscsi_text *hdr)
2194 {
2195         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2196         int cmdsn_ret;
2197
2198         if (!text_in) {
2199                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2200                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2201                         pr_err("Unable to locate text_in buffer for sendtargets"
2202                                " discovery\n");
2203                         goto reject;
2204                 }
2205                 goto empty_sendtargets;
2206         }
2207         if (strncmp("SendTargets=", text_in, 12) != 0) {
2208                 pr_err("Received Text Data that is not"
2209                         " SendTargets, cannot continue.\n");
2210                 goto reject;
2211         }
2212         /* '=' confirmed in strncmp */
2213         text_ptr = strchr(text_in, '=');
2214         BUG_ON(!text_ptr);
2215         if (!strncmp("=All", text_ptr, 5)) {
2216                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2217         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2218                    !strncmp("=eui.", text_ptr, 5)) {
2219                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2220         } else {
2221                 pr_err("Unable to locate valid SendTargets%s value\n",
2222                        text_ptr);
2223                 goto reject;
2224         }
2225
2226         spin_lock_bh(&conn->cmd_lock);
2227         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2228         spin_unlock_bh(&conn->cmd_lock);
2229
2230 empty_sendtargets:
2231         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2232
2233         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2234                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2235                                 (unsigned char *)hdr, hdr->cmdsn);
2236                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2237                         return -1;
2238
2239                 return 0;
2240         }
2241
2242         return iscsit_execute_cmd(cmd, 0);
2243
2244 reject:
2245         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2246                                  (unsigned char *)hdr);
2247 }
2248 EXPORT_SYMBOL(iscsit_process_text_cmd);
2249
2250 static int
2251 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2252                        unsigned char *buf)
2253 {
2254         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2255         char *text_in = NULL;
2256         u32 payload_length = ntoh24(hdr->dlength);
2257         int rx_size, rc;
2258
2259         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2260         if (rc < 0)
2261                 return 0;
2262
2263         rx_size = payload_length;
2264         if (payload_length) {
2265                 u32 checksum = 0, data_crc = 0;
2266                 u32 padding = 0;
2267                 int niov = 0, rx_got;
2268                 struct kvec iov[2];
2269
2270                 rx_size = ALIGN(payload_length, 4);
2271                 text_in = kzalloc(rx_size, GFP_KERNEL);
2272                 if (!text_in)
2273                         goto reject;
2274
2275                 cmd->text_in_ptr = text_in;
2276
2277                 memset(iov, 0, sizeof(iov));
2278                 iov[niov].iov_base      = text_in;
2279                 iov[niov++].iov_len     = rx_size;
2280
2281                 padding = rx_size - payload_length;
2282                 if (padding)
2283                         pr_debug("Receiving %u additional bytes"
2284                                         " for padding.\n", padding);
2285                 if (conn->conn_ops->DataDigest) {
2286                         iov[niov].iov_base      = &checksum;
2287                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2288                         rx_size += ISCSI_CRC_LEN;
2289                 }
2290
2291                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2292                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2293                 if (rx_got != rx_size)
2294                         goto reject;
2295
2296                 if (conn->conn_ops->DataDigest) {
2297                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2298                                                   text_in, rx_size, 0, NULL,
2299                                                   &data_crc);
2300
2301                         if (checksum != data_crc) {
2302                                 pr_err("Text data CRC32C DataDigest"
2303                                         " 0x%08x does not match computed"
2304                                         " 0x%08x\n", checksum, data_crc);
2305                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2306                                         pr_err("Unable to recover from"
2307                                         " Text Data digest failure while in"
2308                                                 " ERL=0.\n");
2309                                         goto reject;
2310                                 } else {
2311                                         /*
2312                                          * Silently drop this PDU and let the
2313                                          * initiator plug the CmdSN gap.
2314                                          */
2315                                         pr_debug("Dropping Text"
2316                                         " Command CmdSN: 0x%08x due to"
2317                                         " DataCRC error.\n", hdr->cmdsn);
2318                                         kfree(text_in);
2319                                         return 0;
2320                                 }
2321                         } else {
2322                                 pr_debug("Got CRC32C DataDigest"
2323                                         " 0x%08x for %u bytes of text data.\n",
2324                                                 checksum, payload_length);
2325                         }
2326                 }
2327                 text_in[payload_length - 1] = '\0';
2328                 pr_debug("Successfully read %d bytes of text"
2329                                 " data.\n", payload_length);
2330         }
2331
2332         return iscsit_process_text_cmd(conn, cmd, hdr);
2333
2334 reject:
2335         kfree(cmd->text_in_ptr);
2336         cmd->text_in_ptr = NULL;
2337         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2338 }
2339
2340 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2341 {
2342         struct iscsi_conn *conn_p;
2343         struct iscsi_session *sess = conn->sess;
2344
2345         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2346                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2347
2348         atomic_set(&sess->session_logout, 1);
2349         atomic_set(&conn->conn_logout_remove, 1);
2350         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2351
2352         iscsit_inc_conn_usage_count(conn);
2353         iscsit_inc_session_usage_count(sess);
2354
2355         spin_lock_bh(&sess->conn_lock);
2356         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2357                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2358                         continue;
2359
2360                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2361                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2362         }
2363         spin_unlock_bh(&sess->conn_lock);
2364
2365         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2366
2367         return 0;
2368 }
2369
2370 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2371 {
2372         struct iscsi_conn *l_conn;
2373         struct iscsi_session *sess = conn->sess;
2374
2375         pr_debug("Received logout request CLOSECONNECTION for CID:"
2376                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2377
2378         /*
2379          * A Logout Request with a CLOSECONNECTION reason code for a CID
2380          * can arrive on a connection with a differing CID.
2381          */
2382         if (conn->cid == cmd->logout_cid) {
2383                 spin_lock_bh(&conn->state_lock);
2384                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2385                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2386
2387                 atomic_set(&conn->conn_logout_remove, 1);
2388                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2389                 iscsit_inc_conn_usage_count(conn);
2390
2391                 spin_unlock_bh(&conn->state_lock);
2392         } else {
2393                 /*
2394                  * Handle all different cid CLOSECONNECTION requests in
2395                  * iscsit_logout_post_handler_diffcid() as to give enough
2396                  * time for any non immediate command's CmdSN to be
2397                  * acknowledged on the connection in question.
2398                  *
2399                  * Here we simply make sure the CID is still around.
2400                  */
2401                 l_conn = iscsit_get_conn_from_cid(sess,
2402                                 cmd->logout_cid);
2403                 if (!l_conn) {
2404                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2405                         iscsit_add_cmd_to_response_queue(cmd, conn,
2406                                         cmd->i_state);
2407                         return 0;
2408                 }
2409
2410                 iscsit_dec_conn_usage_count(l_conn);
2411         }
2412
2413         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414
2415         return 0;
2416 }
2417
2418 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2419 {
2420         struct iscsi_session *sess = conn->sess;
2421
2422         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2423                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2424
2425         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2426                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2427                         " while ERL!=2.\n");
2428                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2429                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2430                 return 0;
2431         }
2432
2433         if (conn->cid == cmd->logout_cid) {
2434                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2435                         " with CID: %hu on CID: %hu, implementation error.\n",
2436                                 cmd->logout_cid, conn->cid);
2437                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2438                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439                 return 0;
2440         }
2441
2442         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2443
2444         return 0;
2445 }
2446
2447 int
2448 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2449                         unsigned char *buf)
2450 {
2451         int cmdsn_ret, logout_remove = 0;
2452         u8 reason_code = 0;
2453         struct iscsi_logout *hdr;
2454         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2455
2456         hdr                     = (struct iscsi_logout *) buf;
2457         reason_code             = (hdr->flags & 0x7f);
2458
2459         if (tiqn) {
2460                 spin_lock(&tiqn->logout_stats.lock);
2461                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2462                         tiqn->logout_stats.normal_logouts++;
2463                 else
2464                         tiqn->logout_stats.abnormal_logouts++;
2465                 spin_unlock(&tiqn->logout_stats.lock);
2466         }
2467
2468         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2469                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2470                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2471                 hdr->cid, conn->cid);
2472
2473         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2474                 pr_err("Received logout request on connection that"
2475                         " is not in logged in state, ignoring request.\n");
2476                 iscsit_free_cmd(cmd, false);
2477                 return 0;
2478         }
2479
2480         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2481         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2482         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2483         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2484         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2485         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2486         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2487         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2488         cmd->logout_reason      = reason_code;
2489         cmd->data_direction     = DMA_NONE;
2490
2491         /*
2492          * We need to sleep in these cases (by returning 1) until the Logout
2493          * Response gets sent in the tx thread.
2494          */
2495         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2496            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2497             be16_to_cpu(hdr->cid) == conn->cid))
2498                 logout_remove = 1;
2499
2500         spin_lock_bh(&conn->cmd_lock);
2501         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2502         spin_unlock_bh(&conn->cmd_lock);
2503
2504         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2505                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2506
2507         /*
2508          * Immediate commands are executed, well, immediately.
2509          * Non-Immediate Logout Commands are executed in CmdSN order.
2510          */
2511         if (cmd->immediate_cmd) {
2512                 int ret = iscsit_execute_cmd(cmd, 0);
2513
2514                 if (ret < 0)
2515                         return ret;
2516         } else {
2517                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2518                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2519                         logout_remove = 0;
2520                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2521                         return -1;
2522         }
2523
2524         return logout_remove;
2525 }
2526 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2527
2528 int iscsit_handle_snack(
2529         struct iscsi_conn *conn,
2530         unsigned char *buf)
2531 {
2532         struct iscsi_snack *hdr;
2533
2534         hdr                     = (struct iscsi_snack *) buf;
2535         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2536
2537         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2538                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2539                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2540                         hdr->begrun, hdr->runlength, conn->cid);
2541
2542         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2543                 pr_err("Initiator sent SNACK request while in"
2544                         " ErrorRecoveryLevel=0.\n");
2545                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2546                                          buf);
2547         }
2548         /*
2549          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2550          * call from inside iscsi_send_recovery_datain_or_r2t().
2551          */
2552         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2553         case 0:
2554                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2555                         hdr->itt,
2556                         be32_to_cpu(hdr->ttt),
2557                         be32_to_cpu(hdr->begrun),
2558                         be32_to_cpu(hdr->runlength));
2559         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2560                 return iscsit_handle_status_snack(conn, hdr->itt,
2561                         be32_to_cpu(hdr->ttt),
2562                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2563         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2564                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2565                         be32_to_cpu(hdr->begrun),
2566                         be32_to_cpu(hdr->runlength));
2567         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2568                 /* FIXME: Support R-Data SNACK */
2569                 pr_err("R-Data SNACK Not Supported.\n");
2570                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2571                                          buf);
2572         default:
2573                 pr_err("Unknown SNACK type 0x%02x, protocol"
2574                         " error.\n", hdr->flags & 0x0f);
2575                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2576                                          buf);
2577         }
2578
2579         return 0;
2580 }
2581 EXPORT_SYMBOL(iscsit_handle_snack);
2582
2583 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2584 {
2585         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2586             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2587                 wait_for_completion_interruptible_timeout(
2588                                         &conn->rx_half_close_comp,
2589                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2590         }
2591 }
2592
2593 static int iscsit_handle_immediate_data(
2594         struct iscsi_cmd *cmd,
2595         struct iscsi_scsi_req *hdr,
2596         u32 length)
2597 {
2598         int iov_ret, rx_got = 0, rx_size = 0;
2599         u32 checksum, iov_count = 0, padding = 0;
2600         struct iscsi_conn *conn = cmd->conn;
2601         struct kvec *iov;
2602         void *overflow_buf = NULL;
2603
2604         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2605         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2606         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2607                                    cmd->orig_iov_data_count - 2,
2608                                    cmd->write_data_done, rx_size);
2609         if (iov_ret < 0)
2610                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2611
2612         iov_count = iov_ret;
2613         iov = &cmd->iov_data[0];
2614         if (rx_size < length) {
2615                 /*
2616                  * Special case: length of immediate data exceeds the data
2617                  * buffer size derived from the CDB.
2618                  */
2619                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2620                 if (!overflow_buf) {
2621                         iscsit_unmap_iovec(cmd);
2622                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2623                 }
2624                 cmd->overflow_buf = overflow_buf;
2625                 iov[iov_count].iov_base = overflow_buf;
2626                 iov[iov_count].iov_len = length - rx_size;
2627                 iov_count++;
2628                 rx_size = length;
2629         }
2630
2631         padding = ((-length) & 3);
2632         if (padding != 0) {
2633                 iov[iov_count].iov_base = cmd->pad_bytes;
2634                 iov[iov_count++].iov_len = padding;
2635                 rx_size += padding;
2636         }
2637
2638         if (conn->conn_ops->DataDigest) {
2639                 iov[iov_count].iov_base         = &checksum;
2640                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2641                 rx_size += ISCSI_CRC_LEN;
2642         }
2643
2644         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2645         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2646
2647         iscsit_unmap_iovec(cmd);
2648
2649         if (rx_got != rx_size) {
2650                 iscsit_rx_thread_wait_for_tcp(conn);
2651                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2652         }
2653
2654         if (conn->conn_ops->DataDigest) {
2655                 u32 data_crc;
2656
2657                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2658                                                     cmd->write_data_done, length, padding,
2659                                                     cmd->pad_bytes);
2660
2661                 if (checksum != data_crc) {
2662                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2663                                 " does not match computed 0x%08x\n", checksum,
2664                                 data_crc);
2665
2666                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2667                                 pr_err("Unable to recover from"
2668                                         " Immediate Data digest failure while"
2669                                         " in ERL=0.\n");
2670                                 iscsit_reject_cmd(cmd,
2671                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2672                                                 (unsigned char *)hdr);
2673                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2674                         } else {
2675                                 iscsit_reject_cmd(cmd,
2676                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2677                                                 (unsigned char *)hdr);
2678                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2679                         }
2680                 } else {
2681                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2682                                 " %u bytes of Immediate Data\n", checksum,
2683                                 length);
2684                 }
2685         }
2686
2687         cmd->write_data_done += length;
2688
2689         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2690                 spin_lock_bh(&cmd->istate_lock);
2691                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2692                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2693                 spin_unlock_bh(&cmd->istate_lock);
2694         }
2695
2696         return IMMEDIATE_DATA_NORMAL_OPERATION;
2697 }
2698
2699 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2700         with active network interface */
2701 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2702 {
2703         struct iscsi_cmd *cmd;
2704         struct iscsi_conn *conn_p;
2705         bool found = false;
2706
2707         lockdep_assert_held(&conn->sess->conn_lock);
2708
2709         /*
2710          * Only send a Asynchronous Message on connections whos network
2711          * interface is still functional.
2712          */
2713         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2714                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2715                         iscsit_inc_conn_usage_count(conn_p);
2716                         found = true;
2717                         break;
2718                 }
2719         }
2720
2721         if (!found)
2722                 return;
2723
2724         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2725         if (!cmd) {
2726                 iscsit_dec_conn_usage_count(conn_p);
2727                 return;
2728         }
2729
2730         cmd->logout_cid = conn->cid;
2731         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2732         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2733
2734         spin_lock_bh(&conn_p->cmd_lock);
2735         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2736         spin_unlock_bh(&conn_p->cmd_lock);
2737
2738         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2739         iscsit_dec_conn_usage_count(conn_p);
2740 }
2741
2742 static int iscsit_send_conn_drop_async_message(
2743         struct iscsi_cmd *cmd,
2744         struct iscsi_conn *conn)
2745 {
2746         struct iscsi_async *hdr;
2747
2748         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2749
2750         hdr                     = (struct iscsi_async *) cmd->pdu;
2751         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2752         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2753         cmd->init_task_tag      = RESERVED_ITT;
2754         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2755         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2756         cmd->stat_sn            = conn->stat_sn++;
2757         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2758         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2759         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2760         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2761         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2762         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2763         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2764
2765         pr_debug("Sending Connection Dropped Async Message StatSN:"
2766                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2767                         cmd->logout_cid, conn->cid);
2768
2769         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2770 }
2771
2772 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2773 {
2774         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2775             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2776                 wait_for_completion_interruptible_timeout(
2777                                         &conn->tx_half_close_comp,
2778                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2779         }
2780 }
2781
2782 void
2783 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2784                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2785                         bool set_statsn)
2786 {
2787         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2788         hdr->flags              = datain->flags;
2789         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2790                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2791                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2792                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2793                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2794                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2795                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2796                 }
2797         }
2798         hton24(hdr->dlength, datain->length);
2799         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2800                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2801                                 (struct scsi_lun *)&hdr->lun);
2802         else
2803                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2804
2805         hdr->itt                = cmd->init_task_tag;
2806
2807         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2808                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2809         else
2810                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2811         if (set_statsn)
2812                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2813         else
2814                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2815
2816         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2817         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2818         hdr->datasn             = cpu_to_be32(datain->data_sn);
2819         hdr->offset             = cpu_to_be32(datain->offset);
2820
2821         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2822                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2823                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2824                 ntohl(hdr->offset), datain->length, conn->cid);
2825 }
2826 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2827
2828 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2829 {
2830         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2831         struct iscsi_datain datain;
2832         struct iscsi_datain_req *dr;
2833         int eodr = 0, ret;
2834         bool set_statsn = false;
2835
2836         memset(&datain, 0, sizeof(struct iscsi_datain));
2837         dr = iscsit_get_datain_values(cmd, &datain);
2838         if (!dr) {
2839                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2840                                 cmd->init_task_tag);
2841                 return -1;
2842         }
2843         /*
2844          * Be paranoid and double check the logic for now.
2845          */
2846         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2847                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2848                         " datain.length: %u exceeds cmd->data_length: %u\n",
2849                         cmd->init_task_tag, datain.offset, datain.length,
2850                         cmd->se_cmd.data_length);
2851                 return -1;
2852         }
2853
2854         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2855         /*
2856          * Special case for successfully execution w/ both DATAIN
2857          * and Sense Data.
2858          */
2859         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2860             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2861                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2862         else {
2863                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2864                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2865                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2866                         cmd->stat_sn = conn->stat_sn++;
2867                         set_statsn = true;
2868                 } else if (dr->dr_complete ==
2869                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2870                         set_statsn = true;
2871         }
2872
2873         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2874
2875         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2876         if (ret < 0)
2877                 return ret;
2878
2879         if (dr->dr_complete) {
2880                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2881                                 2 : 1;
2882                 iscsit_free_datain_req(cmd, dr);
2883         }
2884
2885         return eodr;
2886 }
2887
2888 int
2889 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2890                         struct iscsi_logout_rsp *hdr)
2891 {
2892         struct iscsi_conn *logout_conn = NULL;
2893         struct iscsi_conn_recovery *cr = NULL;
2894         struct iscsi_session *sess = conn->sess;
2895         /*
2896          * The actual shutting down of Sessions and/or Connections
2897          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2898          * is done in scsi_logout_post_handler().
2899          */
2900         switch (cmd->logout_reason) {
2901         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2902                 pr_debug("iSCSI session logout successful, setting"
2903                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2904                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2905                 break;
2906         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2907                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2908                         break;
2909                 /*
2910                  * For CLOSECONNECTION logout requests carrying
2911                  * a matching logout CID -> local CID, the reference
2912                  * for the local CID will have been incremented in
2913                  * iscsi_logout_closeconnection().
2914                  *
2915                  * For CLOSECONNECTION logout requests carrying
2916                  * a different CID than the connection it arrived
2917                  * on, the connection responding to cmd->logout_cid
2918                  * is stopped in iscsit_logout_post_handler_diffcid().
2919                  */
2920
2921                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2922                         " successful.\n", cmd->logout_cid, conn->cid);
2923                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2924                 break;
2925         case ISCSI_LOGOUT_REASON_RECOVERY:
2926                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2927                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2928                         break;
2929                 /*
2930                  * If the connection is still active from our point of view
2931                  * force connection recovery to occur.
2932                  */
2933                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2934                                 cmd->logout_cid);
2935                 if (logout_conn) {
2936                         iscsit_connection_reinstatement_rcfr(logout_conn);
2937                         iscsit_dec_conn_usage_count(logout_conn);
2938                 }
2939
2940                 cr = iscsit_get_inactive_connection_recovery_entry(
2941                                 conn->sess, cmd->logout_cid);
2942                 if (!cr) {
2943                         pr_err("Unable to locate CID: %hu for"
2944                         " REMOVECONNFORRECOVERY Logout Request.\n",
2945                                 cmd->logout_cid);
2946                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2947                         break;
2948                 }
2949
2950                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2951
2952                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2953                         " for recovery for CID: %hu on CID: %hu successful.\n",
2954                                 cmd->logout_cid, conn->cid);
2955                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2956                 break;
2957         default:
2958                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2959                                 cmd->logout_reason);
2960                 return -1;
2961         }
2962
2963         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2964         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2965         hdr->response           = cmd->logout_response;
2966         hdr->itt                = cmd->init_task_tag;
2967         cmd->stat_sn            = conn->stat_sn++;
2968         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2969
2970         iscsit_increment_maxcmdsn(cmd, conn->sess);
2971         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2972         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2973
2974         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2975                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2976                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2977                 cmd->logout_cid, conn->cid);
2978
2979         return 0;
2980 }
2981 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2982
2983 static int
2984 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2985 {
2986         int rc;
2987
2988         rc = iscsit_build_logout_rsp(cmd, conn,
2989                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2990         if (rc < 0)
2991                 return rc;
2992
2993         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2994 }
2995
2996 void
2997 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2998                        struct iscsi_nopin *hdr, bool nopout_response)
2999 {
3000         hdr->opcode             = ISCSI_OP_NOOP_IN;
3001         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3002         hton24(hdr->dlength, cmd->buf_ptr_size);
3003         if (nopout_response)
3004                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3005         hdr->itt                = cmd->init_task_tag;
3006         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3007         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3008                                   conn->stat_sn;
3009         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3010
3011         if (nopout_response)
3012                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3013
3014         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3015         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3016
3017         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3018                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3019                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3020                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3021 }
3022 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3023
3024 /*
3025  *      Unsolicited NOPIN, either requesting a response or not.
3026  */
3027 static int iscsit_send_unsolicited_nopin(
3028         struct iscsi_cmd *cmd,
3029         struct iscsi_conn *conn,
3030         int want_response)
3031 {
3032         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3033         int ret;
3034
3035         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3036
3037         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3038                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3039
3040         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3041         if (ret < 0)
3042                 return ret;
3043
3044         spin_lock_bh(&cmd->istate_lock);
3045         cmd->i_state = want_response ?
3046                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3047         spin_unlock_bh(&cmd->istate_lock);
3048
3049         return 0;
3050 }
3051
3052 static int
3053 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3054 {
3055         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3056
3057         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3058
3059         /*
3060          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3061          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3062          */
3063         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3064
3065         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3066                                                      cmd->buf_ptr,
3067                                                      cmd->buf_ptr_size);
3068 }
3069
3070 static int iscsit_send_r2t(
3071         struct iscsi_cmd *cmd,
3072         struct iscsi_conn *conn)
3073 {
3074         struct iscsi_r2t *r2t;
3075         struct iscsi_r2t_rsp *hdr;
3076         int ret;
3077
3078         r2t = iscsit_get_r2t_from_list(cmd);
3079         if (!r2t)
3080                 return -1;
3081
3082         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3083         memset(hdr, 0, ISCSI_HDR_LEN);
3084         hdr->opcode             = ISCSI_OP_R2T;
3085         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3086         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3087                         (struct scsi_lun *)&hdr->lun);
3088         hdr->itt                = cmd->init_task_tag;
3089         if (conn->conn_transport->iscsit_get_r2t_ttt)
3090                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3091         else
3092                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3093         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3094         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3095         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3096         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3097         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3098         hdr->data_offset        = cpu_to_be32(r2t->offset);
3099         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3100
3101         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3102                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3103                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3104                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3105                         r2t->offset, r2t->xfer_len, conn->cid);
3106
3107         spin_lock_bh(&cmd->r2t_lock);
3108         r2t->sent_r2t = 1;
3109         spin_unlock_bh(&cmd->r2t_lock);
3110
3111         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3112         if (ret < 0) {
3113                 return ret;
3114         }
3115
3116         spin_lock_bh(&cmd->dataout_timeout_lock);
3117         iscsit_start_dataout_timer(cmd, conn);
3118         spin_unlock_bh(&cmd->dataout_timeout_lock);
3119
3120         return 0;
3121 }
3122
3123 /*
3124  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3125  *              connection recovery.
3126  */
3127 int iscsit_build_r2ts_for_cmd(
3128         struct iscsi_conn *conn,
3129         struct iscsi_cmd *cmd,
3130         bool recovery)
3131 {
3132         int first_r2t = 1;
3133         u32 offset = 0, xfer_len = 0;
3134
3135         spin_lock_bh(&cmd->r2t_lock);
3136         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3137                 spin_unlock_bh(&cmd->r2t_lock);
3138                 return 0;
3139         }
3140
3141         if (conn->sess->sess_ops->DataSequenceInOrder &&
3142             !recovery)
3143                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3144
3145         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3146                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3147                         offset = cmd->r2t_offset;
3148
3149                         if (first_r2t && recovery) {
3150                                 int new_data_end = offset +
3151                                         conn->sess->sess_ops->MaxBurstLength -
3152                                         cmd->next_burst_len;
3153
3154                                 if (new_data_end > cmd->se_cmd.data_length)
3155                                         xfer_len = cmd->se_cmd.data_length - offset;
3156                                 else
3157                                         xfer_len =
3158                                                 conn->sess->sess_ops->MaxBurstLength -
3159                                                 cmd->next_burst_len;
3160                         } else {
3161                                 int new_data_end = offset +
3162                                         conn->sess->sess_ops->MaxBurstLength;
3163
3164                                 if (new_data_end > cmd->se_cmd.data_length)
3165                                         xfer_len = cmd->se_cmd.data_length - offset;
3166                                 else
3167                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3168                         }
3169
3170                         if ((s32)xfer_len < 0) {
3171                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3172                                 break;
3173                         }
3174
3175                         cmd->r2t_offset += xfer_len;
3176
3177                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3178                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3179                 } else {
3180                         struct iscsi_seq *seq;
3181
3182                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3183                         if (!seq) {
3184                                 spin_unlock_bh(&cmd->r2t_lock);
3185                                 return -1;
3186                         }
3187
3188                         offset = seq->offset;
3189                         xfer_len = seq->xfer_len;
3190
3191                         if (cmd->seq_send_order == cmd->seq_count)
3192                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3193                 }
3194                 cmd->outstanding_r2ts++;
3195                 first_r2t = 0;
3196
3197                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3198                         spin_unlock_bh(&cmd->r2t_lock);
3199                         return -1;
3200                 }
3201
3202                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3203                         break;
3204         }
3205         spin_unlock_bh(&cmd->r2t_lock);
3206
3207         return 0;
3208 }
3209 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3210
3211 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3212                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3213 {
3214         if (inc_stat_sn)
3215                 cmd->stat_sn = conn->stat_sn++;
3216
3217         atomic_long_inc(&conn->sess->rsp_pdus);
3218
3219         memset(hdr, 0, ISCSI_HDR_LEN);
3220         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3221         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3222         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3223                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3224                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3225         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3226                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3227                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3228         }
3229         hdr->response           = cmd->iscsi_response;
3230         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3231         hdr->itt                = cmd->init_task_tag;
3232         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3233
3234         iscsit_increment_maxcmdsn(cmd, conn->sess);
3235         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3236         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3237
3238         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3239                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3240                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3241                 cmd->se_cmd.scsi_status, conn->cid);
3242 }
3243 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3244
3245 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3246 {
3247         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3248         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3249         void *data_buf = NULL;
3250         u32 padding = 0, data_buf_len = 0;
3251
3252         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3253
3254         /*
3255          * Attach SENSE DATA payload to iSCSI Response PDU
3256          */
3257         if (cmd->se_cmd.sense_buffer &&
3258            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3259             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3260                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3261                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3262
3263                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3264                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3265                 data_buf = cmd->sense_buffer;
3266                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3267
3268                 if (padding) {
3269                         memset(cmd->sense_buffer +
3270                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3271                         pr_debug("Adding %u bytes of padding to"
3272                                 " SENSE.\n", padding);
3273                 }
3274
3275                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3276                                 " Response PDU\n",
3277                                 cmd->se_cmd.scsi_sense_length);
3278         }
3279
3280         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3281                                                      data_buf_len);
3282 }
3283
3284 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3285 {
3286         switch (se_tmr->response) {
3287         case TMR_FUNCTION_COMPLETE:
3288                 return ISCSI_TMF_RSP_COMPLETE;
3289         case TMR_TASK_DOES_NOT_EXIST:
3290                 return ISCSI_TMF_RSP_NO_TASK;
3291         case TMR_LUN_DOES_NOT_EXIST:
3292                 return ISCSI_TMF_RSP_NO_LUN;
3293         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3294                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3295         case TMR_FUNCTION_REJECTED:
3296         default:
3297                 return ISCSI_TMF_RSP_REJECTED;
3298         }
3299 }
3300
3301 void
3302 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3303                           struct iscsi_tm_rsp *hdr)
3304 {
3305         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3306
3307         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3308         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3309         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3310         hdr->itt                = cmd->init_task_tag;
3311         cmd->stat_sn            = conn->stat_sn++;
3312         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3313
3314         iscsit_increment_maxcmdsn(cmd, conn->sess);
3315         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3316         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3317
3318         pr_debug("Built Task Management Response ITT: 0x%08x,"
3319                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3320                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3321 }
3322 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3323
3324 static int
3325 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3326 {
3327         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3328
3329         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3330
3331         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3332 }
3333
3334 #define SENDTARGETS_BUF_LIMIT 32768U
3335
3336 static int
3337 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3338                                   enum iscsit_transport_type network_transport,
3339                                   int skip_bytes, bool *completed)
3340 {
3341         char *payload = NULL;
3342         struct iscsi_conn *conn = cmd->conn;
3343         struct iscsi_portal_group *tpg;
3344         struct iscsi_tiqn *tiqn;
3345         struct iscsi_tpg_np *tpg_np;
3346         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3347         int target_name_printed;
3348         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3349         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3350         bool active;
3351
3352         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3353                          SENDTARGETS_BUF_LIMIT);
3354
3355         payload = kzalloc(buffer_len, GFP_KERNEL);
3356         if (!payload)
3357                 return -ENOMEM;
3358
3359         /*
3360          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3361          * explicit case..
3362          */
3363         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3364                 text_ptr = strchr(text_in, '=');
3365                 if (!text_ptr) {
3366                         pr_err("Unable to locate '=' string in text_in:"
3367                                " %s\n", text_in);
3368                         kfree(payload);
3369                         return -EINVAL;
3370                 }
3371                 /*
3372                  * Skip over '=' character..
3373                  */
3374                 text_ptr += 1;
3375         }
3376
3377         spin_lock(&tiqn_lock);
3378         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3379                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3380                      strcmp(tiqn->tiqn, text_ptr)) {
3381                         continue;
3382                 }
3383
3384                 target_name_printed = 0;
3385
3386                 spin_lock(&tiqn->tiqn_tpg_lock);
3387                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3388
3389                         /* If demo_mode_discovery=0 and generate_node_acls=0
3390                          * (demo mode dislabed) do not return
3391                          * TargetName+TargetAddress unless a NodeACL exists.
3392                          */
3393
3394                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3395                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3396                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3397                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3398                                 continue;
3399                         }
3400
3401                         spin_lock(&tpg->tpg_state_lock);
3402                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3403                         spin_unlock(&tpg->tpg_state_lock);
3404
3405                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3406                                 continue;
3407
3408                         spin_lock(&tpg->tpg_np_lock);
3409                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3410                                                 tpg_np_list) {
3411                                 struct iscsi_np *np = tpg_np->tpg_np;
3412                                 struct sockaddr_storage *sockaddr;
3413
3414                                 if (np->np_network_transport != network_transport)
3415                                         continue;
3416
3417                                 if (!target_name_printed) {
3418                                         len = sprintf(buf, "TargetName=%s",
3419                                                       tiqn->tiqn);
3420                                         len += 1;
3421
3422                                         if ((len + payload_len) > buffer_len) {
3423                                                 spin_unlock(&tpg->tpg_np_lock);
3424                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3425                                                 end_of_buf = 1;
3426                                                 goto eob;
3427                                         }
3428
3429                                         if (skip_bytes && len <= skip_bytes) {
3430                                                 skip_bytes -= len;
3431                                         } else {
3432                                                 memcpy(payload + payload_len, buf, len);
3433                                                 payload_len += len;
3434                                                 target_name_printed = 1;
3435                                                 if (len > skip_bytes)
3436                                                         skip_bytes = 0;
3437                                         }
3438                                 }
3439
3440                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3441                                         sockaddr = &conn->local_sockaddr;
3442                                 else
3443                                         sockaddr = &np->np_sockaddr;
3444
3445                                 len = sprintf(buf, "TargetAddress="
3446                                               "%pISpc,%hu",
3447                                               sockaddr,
3448                                               tpg->tpgt);
3449                                 len += 1;
3450
3451                                 if ((len + payload_len) > buffer_len) {
3452                                         spin_unlock(&tpg->tpg_np_lock);
3453                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3454                                         end_of_buf = 1;
3455                                         goto eob;
3456                                 }
3457
3458                                 if (skip_bytes && len <= skip_bytes) {
3459                                         skip_bytes -= len;
3460                                 } else {
3461                                         memcpy(payload + payload_len, buf, len);
3462                                         payload_len += len;
3463                                         if (len > skip_bytes)
3464                                                 skip_bytes = 0;
3465                                 }
3466                         }
3467                         spin_unlock(&tpg->tpg_np_lock);
3468                 }
3469                 spin_unlock(&tiqn->tiqn_tpg_lock);
3470 eob:
3471                 if (end_of_buf) {
3472                         *completed = false;
3473                         break;
3474                 }
3475
3476                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3477                         break;
3478         }
3479         spin_unlock(&tiqn_lock);
3480
3481         cmd->buf_ptr = payload;
3482
3483         return payload_len;
3484 }
3485
3486 int
3487 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3488                       struct iscsi_text_rsp *hdr,
3489                       enum iscsit_transport_type network_transport)
3490 {
3491         int text_length, padding;
3492         bool completed = true;
3493
3494         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3495                                                         cmd->read_data_done,
3496                                                         &completed);
3497         if (text_length < 0)
3498                 return text_length;
3499
3500         if (completed) {
3501                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3502         } else {
3503                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3504                 cmd->read_data_done += text_length;
3505                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3506                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3507         }
3508         hdr->opcode = ISCSI_OP_TEXT_RSP;
3509         padding = ((-text_length) & 3);
3510         hton24(hdr->dlength, text_length);
3511         hdr->itt = cmd->init_task_tag;
3512         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3513         cmd->stat_sn = conn->stat_sn++;
3514         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3515
3516         iscsit_increment_maxcmdsn(cmd, conn->sess);
3517         /*
3518          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3519          * correctly increment MaxCmdSN for each response answering a
3520          * non immediate text request with a valid CmdSN.
3521          */
3522         cmd->maxcmdsn_inc = 0;
3523         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3524         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3525
3526         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3527                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3528                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3529                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3530                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3531
3532         return text_length + padding;
3533 }
3534 EXPORT_SYMBOL(iscsit_build_text_rsp);
3535
3536 static int iscsit_send_text_rsp(
3537         struct iscsi_cmd *cmd,
3538         struct iscsi_conn *conn)
3539 {
3540         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3541         int text_length;
3542
3543         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3544                                 conn->conn_transport->transport_type);
3545         if (text_length < 0)
3546                 return text_length;
3547
3548         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3549                                                      cmd->buf_ptr,
3550                                                      text_length);
3551 }
3552
3553 void
3554 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3555                     struct iscsi_reject *hdr)
3556 {
3557         hdr->opcode             = ISCSI_OP_REJECT;
3558         hdr->reason             = cmd->reject_reason;
3559         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3560         hton24(hdr->dlength, ISCSI_HDR_LEN);
3561         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3562         cmd->stat_sn            = conn->stat_sn++;
3563         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3564         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3565         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3566
3567 }
3568 EXPORT_SYMBOL(iscsit_build_reject);
3569
3570 static int iscsit_send_reject(
3571         struct iscsi_cmd *cmd,
3572         struct iscsi_conn *conn)
3573 {
3574         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3575
3576         iscsit_build_reject(cmd, conn, hdr);
3577
3578         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3579                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3580
3581         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3582                                                      cmd->buf_ptr,
3583                                                      ISCSI_HDR_LEN);
3584 }
3585
3586 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3587 {
3588         int ord, cpu;
3589         /*
3590          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3591          * within iscsit_start_kthreads()
3592          *
3593          * Here we use bitmap_id to determine which CPU that this
3594          * iSCSI connection's RX/TX threads will be scheduled to
3595          * execute upon.
3596          */
3597         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3598         for_each_online_cpu(cpu) {
3599                 if (ord-- == 0) {
3600                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3601                         return;
3602                 }
3603         }
3604         /*
3605          * This should never be reached..
3606          */
3607         dump_stack();
3608         cpumask_setall(conn->conn_cpumask);
3609 }
3610
3611 int
3612 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3613 {
3614         int ret;
3615
3616         switch (state) {
3617         case ISTATE_SEND_R2T:
3618                 ret = iscsit_send_r2t(cmd, conn);
3619                 if (ret < 0)
3620                         goto err;
3621                 break;
3622         case ISTATE_REMOVE:
3623                 spin_lock_bh(&conn->cmd_lock);
3624                 list_del_init(&cmd->i_conn_node);
3625                 spin_unlock_bh(&conn->cmd_lock);
3626
3627                 iscsit_free_cmd(cmd, false);
3628                 break;
3629         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3630                 iscsit_mod_nopin_response_timer(conn);
3631                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3632                 if (ret < 0)
3633                         goto err;
3634                 break;
3635         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3636                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3637                 if (ret < 0)
3638                         goto err;
3639                 break;
3640         default:
3641                 pr_err("Unknown Opcode: 0x%02x ITT:"
3642                        " 0x%08x, i_state: %d on CID: %hu\n",
3643                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3644                        conn->cid);
3645                 goto err;
3646         }
3647
3648         return 0;
3649
3650 err:
3651         return -1;
3652 }
3653 EXPORT_SYMBOL(iscsit_immediate_queue);
3654
3655 static int
3656 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3657 {
3658         struct iscsit_transport *t = conn->conn_transport;
3659         struct iscsi_queue_req *qr;
3660         struct iscsi_cmd *cmd;
3661         u8 state;
3662         int ret;
3663
3664         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3665                 atomic_set(&conn->check_immediate_queue, 0);
3666                 cmd = qr->cmd;
3667                 state = qr->state;
3668                 kmem_cache_free(lio_qr_cache, qr);
3669
3670                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3671                 if (ret < 0)
3672                         return ret;
3673         }
3674
3675         return 0;
3676 }
3677
3678 int
3679 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3680 {
3681         int ret;
3682
3683 check_rsp_state:
3684         switch (state) {
3685         case ISTATE_SEND_DATAIN:
3686                 ret = iscsit_send_datain(cmd, conn);
3687                 if (ret < 0)
3688                         goto err;
3689                 else if (!ret)
3690                         /* more drs */
3691                         goto check_rsp_state;
3692                 else if (ret == 1) {
3693                         /* all done */
3694                         spin_lock_bh(&cmd->istate_lock);
3695                         cmd->i_state = ISTATE_SENT_STATUS;
3696                         spin_unlock_bh(&cmd->istate_lock);
3697
3698                         if (atomic_read(&conn->check_immediate_queue))
3699                                 return 1;
3700
3701                         return 0;
3702                 } else if (ret == 2) {
3703                         /* Still must send status,
3704                            SCF_TRANSPORT_TASK_SENSE was set */
3705                         spin_lock_bh(&cmd->istate_lock);
3706                         cmd->i_state = ISTATE_SEND_STATUS;
3707                         spin_unlock_bh(&cmd->istate_lock);
3708                         state = ISTATE_SEND_STATUS;
3709                         goto check_rsp_state;
3710                 }
3711
3712                 break;
3713         case ISTATE_SEND_STATUS:
3714         case ISTATE_SEND_STATUS_RECOVERY:
3715                 ret = iscsit_send_response(cmd, conn);
3716                 break;
3717         case ISTATE_SEND_LOGOUTRSP:
3718                 ret = iscsit_send_logout(cmd, conn);
3719                 break;
3720         case ISTATE_SEND_ASYNCMSG:
3721                 ret = iscsit_send_conn_drop_async_message(
3722                         cmd, conn);
3723                 break;
3724         case ISTATE_SEND_NOPIN:
3725                 ret = iscsit_send_nopin(cmd, conn);
3726                 break;
3727         case ISTATE_SEND_REJECT:
3728                 ret = iscsit_send_reject(cmd, conn);
3729                 break;
3730         case ISTATE_SEND_TASKMGTRSP:
3731                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3732                 if (ret != 0)
3733                         break;
3734                 ret = iscsit_tmr_post_handler(cmd, conn);
3735                 if (ret != 0)
3736                         iscsit_fall_back_to_erl0(conn->sess);
3737                 break;
3738         case ISTATE_SEND_TEXTRSP:
3739                 ret = iscsit_send_text_rsp(cmd, conn);
3740                 break;
3741         default:
3742                 pr_err("Unknown Opcode: 0x%02x ITT:"
3743                        " 0x%08x, i_state: %d on CID: %hu\n",
3744                        cmd->iscsi_opcode, cmd->init_task_tag,
3745                        state, conn->cid);
3746                 goto err;
3747         }
3748         if (ret < 0)
3749                 goto err;
3750
3751         switch (state) {
3752         case ISTATE_SEND_LOGOUTRSP:
3753                 if (!iscsit_logout_post_handler(cmd, conn))
3754                         return -ECONNRESET;
3755                 fallthrough;
3756         case ISTATE_SEND_STATUS:
3757         case ISTATE_SEND_ASYNCMSG:
3758         case ISTATE_SEND_NOPIN:
3759         case ISTATE_SEND_STATUS_RECOVERY:
3760         case ISTATE_SEND_TEXTRSP:
3761         case ISTATE_SEND_TASKMGTRSP:
3762         case ISTATE_SEND_REJECT:
3763                 spin_lock_bh(&cmd->istate_lock);
3764                 cmd->i_state = ISTATE_SENT_STATUS;
3765                 spin_unlock_bh(&cmd->istate_lock);
3766                 break;
3767         default:
3768                 pr_err("Unknown Opcode: 0x%02x ITT:"
3769                        " 0x%08x, i_state: %d on CID: %hu\n",
3770                        cmd->iscsi_opcode, cmd->init_task_tag,
3771                        cmd->i_state, conn->cid);
3772                 goto err;
3773         }
3774
3775         if (atomic_read(&conn->check_immediate_queue))
3776                 return 1;
3777
3778         return 0;
3779
3780 err:
3781         return -1;
3782 }
3783 EXPORT_SYMBOL(iscsit_response_queue);
3784
3785 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3786 {
3787         struct iscsit_transport *t = conn->conn_transport;
3788         struct iscsi_queue_req *qr;
3789         struct iscsi_cmd *cmd;
3790         u8 state;
3791         int ret;
3792
3793         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3794                 cmd = qr->cmd;
3795                 state = qr->state;
3796                 kmem_cache_free(lio_qr_cache, qr);
3797
3798                 ret = t->iscsit_response_queue(conn, cmd, state);
3799                 if (ret == 1 || ret < 0)
3800                         return ret;
3801         }
3802
3803         return 0;
3804 }
3805
3806 int iscsi_target_tx_thread(void *arg)
3807 {
3808         int ret = 0;
3809         struct iscsi_conn *conn = arg;
3810         bool conn_freed = false;
3811
3812         /*
3813          * Allow ourselves to be interrupted by SIGINT so that a
3814          * connection recovery / failure event can be triggered externally.
3815          */
3816         allow_signal(SIGINT);
3817
3818         while (!kthread_should_stop()) {
3819                 /*
3820                  * Ensure that both TX and RX per connection kthreads
3821                  * are scheduled to run on the same CPU.
3822                  */
3823                 iscsit_thread_check_cpumask(conn, current, 1);
3824
3825                 wait_event_interruptible(conn->queues_wq,
3826                                          !iscsit_conn_all_queues_empty(conn));
3827
3828                 if (signal_pending(current))
3829                         goto transport_err;
3830
3831 get_immediate:
3832                 ret = iscsit_handle_immediate_queue(conn);
3833                 if (ret < 0)
3834                         goto transport_err;
3835
3836                 ret = iscsit_handle_response_queue(conn);
3837                 if (ret == 1) {
3838                         goto get_immediate;
3839                 } else if (ret == -ECONNRESET) {
3840                         conn_freed = true;
3841                         goto out;
3842                 } else if (ret < 0) {
3843                         goto transport_err;
3844                 }
3845         }
3846
3847 transport_err:
3848         /*
3849          * Avoid the normal connection failure code-path if this connection
3850          * is still within LOGIN mode, and iscsi_np process context is
3851          * responsible for cleaning up the early connection failure.
3852          */
3853         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3854                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3855 out:
3856         if (!conn_freed) {
3857                 while (!kthread_should_stop()) {
3858                         msleep(100);
3859                 }
3860         }
3861         return 0;
3862 }
3863
3864 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3865 {
3866         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3867         struct iscsi_cmd *cmd;
3868         int ret = 0;
3869
3870         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3871         case ISCSI_OP_SCSI_CMD:
3872                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3873                 if (!cmd)
3874                         goto reject;
3875
3876                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3877                 break;
3878         case ISCSI_OP_SCSI_DATA_OUT:
3879                 ret = iscsit_handle_data_out(conn, buf);
3880                 break;
3881         case ISCSI_OP_NOOP_OUT:
3882                 cmd = NULL;
3883                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3884                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3885                         if (!cmd)
3886                                 goto reject;
3887                 }
3888                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3889                 break;
3890         case ISCSI_OP_SCSI_TMFUNC:
3891                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3892                 if (!cmd)
3893                         goto reject;
3894
3895                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3896                 break;
3897         case ISCSI_OP_TEXT:
3898                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3899                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3900                         if (!cmd)
3901                                 goto reject;
3902                 } else {
3903                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3904                         if (!cmd)
3905                                 goto reject;
3906                 }
3907
3908                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3909                 break;
3910         case ISCSI_OP_LOGOUT:
3911                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3912                 if (!cmd)
3913                         goto reject;
3914
3915                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3916                 if (ret > 0)
3917                         wait_for_completion_timeout(&conn->conn_logout_comp,
3918                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3919                 break;
3920         case ISCSI_OP_SNACK:
3921                 ret = iscsit_handle_snack(conn, buf);
3922                 break;
3923         default:
3924                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3925                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3926                         pr_err("Cannot recover from unknown"
3927                         " opcode while ERL=0, closing iSCSI connection.\n");
3928                         return -1;
3929                 }
3930                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3931                        " closing iSCSI connection.\n");
3932                 ret = -1;
3933                 break;
3934         }
3935
3936         return ret;
3937 reject:
3938         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3939 }
3940
3941 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3942 {
3943         bool ret;
3944
3945         spin_lock_bh(&conn->state_lock);
3946         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3947         spin_unlock_bh(&conn->state_lock);
3948
3949         return ret;
3950 }
3951
3952 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3953 {
3954         int ret;
3955         u8 *buffer, opcode;
3956         u32 checksum = 0, digest = 0;
3957         struct kvec iov;
3958
3959         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3960         if (!buffer)
3961                 return;
3962
3963         while (!kthread_should_stop()) {
3964                 /*
3965                  * Ensure that both TX and RX per connection kthreads
3966                  * are scheduled to run on the same CPU.
3967                  */
3968                 iscsit_thread_check_cpumask(conn, current, 0);
3969
3970                 memset(&iov, 0, sizeof(struct kvec));
3971
3972                 iov.iov_base    = buffer;
3973                 iov.iov_len     = ISCSI_HDR_LEN;
3974
3975                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3976                 if (ret != ISCSI_HDR_LEN) {
3977                         iscsit_rx_thread_wait_for_tcp(conn);
3978                         break;
3979                 }
3980
3981                 if (conn->conn_ops->HeaderDigest) {
3982                         iov.iov_base    = &digest;
3983                         iov.iov_len     = ISCSI_CRC_LEN;
3984
3985                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3986                         if (ret != ISCSI_CRC_LEN) {
3987                                 iscsit_rx_thread_wait_for_tcp(conn);
3988                                 break;
3989                         }
3990
3991                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3992                                                   ISCSI_HDR_LEN, 0, NULL,
3993                                                   &checksum);
3994
3995                         if (digest != checksum) {
3996                                 pr_err("HeaderDigest CRC32C failed,"
3997                                         " received 0x%08x, computed 0x%08x\n",
3998                                         digest, checksum);
3999                                 /*
4000                                  * Set the PDU to 0xff so it will intentionally
4001                                  * hit default in the switch below.
4002                                  */
4003                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4004                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4005                         } else {
4006                                 pr_debug("Got HeaderDigest CRC32C"
4007                                                 " 0x%08x\n", checksum);
4008                         }
4009                 }
4010
4011                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4012                         break;
4013
4014                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4015
4016                 if (conn->sess->sess_ops->SessionType &&
4017                    ((!(opcode & ISCSI_OP_TEXT)) ||
4018                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4019                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4020                         " while in Discovery Session, rejecting.\n", opcode);
4021                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4022                                           buffer);
4023                         break;
4024                 }
4025
4026                 ret = iscsi_target_rx_opcode(conn, buffer);
4027                 if (ret < 0)
4028                         break;
4029         }
4030
4031         kfree(buffer);
4032 }
4033
4034 int iscsi_target_rx_thread(void *arg)
4035 {
4036         int rc;
4037         struct iscsi_conn *conn = arg;
4038         bool conn_freed = false;
4039
4040         /*
4041          * Allow ourselves to be interrupted by SIGINT so that a
4042          * connection recovery / failure event can be triggered externally.
4043          */
4044         allow_signal(SIGINT);
4045         /*
4046          * Wait for iscsi_post_login_handler() to complete before allowing
4047          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4048          */
4049         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4050         if (rc < 0 || iscsi_target_check_conn_state(conn))
4051                 goto out;
4052
4053         if (!conn->conn_transport->iscsit_get_rx_pdu)
4054                 return 0;
4055
4056         conn->conn_transport->iscsit_get_rx_pdu(conn);
4057
4058         if (!signal_pending(current))
4059                 atomic_set(&conn->transport_failed, 1);
4060         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4061
4062 out:
4063         if (!conn_freed) {
4064                 while (!kthread_should_stop()) {
4065                         msleep(100);
4066                 }
4067         }
4068
4069         return 0;
4070 }
4071
4072 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4073 {
4074         LIST_HEAD(tmp_list);
4075         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4076         struct iscsi_session *sess = conn->sess;
4077         /*
4078          * We expect this function to only ever be called from either RX or TX
4079          * thread context via iscsit_close_connection() once the other context
4080          * has been reset -> returned sleeping pre-handler state.
4081          */
4082         spin_lock_bh(&conn->cmd_lock);
4083         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4084
4085         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4086                 struct se_cmd *se_cmd = &cmd->se_cmd;
4087
4088                 if (se_cmd->se_tfo != NULL) {
4089                         spin_lock_irq(&se_cmd->t_state_lock);
4090                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4091                                 /*
4092                                  * LIO's abort path owns the cleanup for this,
4093                                  * so put it back on the list and let
4094                                  * aborted_task handle it.
4095                                  */
4096                                 list_move_tail(&cmd->i_conn_node,
4097                                                &conn->conn_cmd_list);
4098                         } else {
4099                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4100                         }
4101                         spin_unlock_irq(&se_cmd->t_state_lock);
4102                 }
4103         }
4104         spin_unlock_bh(&conn->cmd_lock);
4105
4106         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4107                 list_del_init(&cmd->i_conn_node);
4108
4109                 iscsit_increment_maxcmdsn(cmd, sess);
4110                 iscsit_free_cmd(cmd, true);
4111
4112         }
4113 }
4114
4115 static void iscsit_stop_timers_for_cmds(
4116         struct iscsi_conn *conn)
4117 {
4118         struct iscsi_cmd *cmd;
4119
4120         spin_lock_bh(&conn->cmd_lock);
4121         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4122                 if (cmd->data_direction == DMA_TO_DEVICE)
4123                         iscsit_stop_dataout_timer(cmd);
4124         }
4125         spin_unlock_bh(&conn->cmd_lock);
4126 }
4127
4128 int iscsit_close_connection(
4129         struct iscsi_conn *conn)
4130 {
4131         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4132         struct iscsi_session    *sess = conn->sess;
4133
4134         pr_debug("Closing iSCSI connection CID %hu on SID:"
4135                 " %u\n", conn->cid, sess->sid);
4136         /*
4137          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4138          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4139          * sleeping and the logout response never got sent because the
4140          * connection failed.
4141          *
4142          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4143          * to signal logout response TX interrupt completion.  Go ahead and skip
4144          * this for iser since isert_rx_opcode() does not wait on logout failure,
4145          * and to avoid iscsi_conn pointer dereference in iser-target code.
4146          */
4147         if (!conn->conn_transport->rdma_shutdown)
4148                 complete(&conn->conn_logout_comp);
4149
4150         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4151                 if (conn->tx_thread &&
4152                     cmpxchg(&conn->tx_thread_active, true, false)) {
4153                         send_sig(SIGINT, conn->tx_thread, 1);
4154                         kthread_stop(conn->tx_thread);
4155                 }
4156         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4157                 if (conn->rx_thread &&
4158                     cmpxchg(&conn->rx_thread_active, true, false)) {
4159                         send_sig(SIGINT, conn->rx_thread, 1);
4160                         kthread_stop(conn->rx_thread);
4161                 }
4162         }
4163
4164         spin_lock(&iscsit_global->ts_bitmap_lock);
4165         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4166                               get_order(1));
4167         spin_unlock(&iscsit_global->ts_bitmap_lock);
4168
4169         iscsit_stop_timers_for_cmds(conn);
4170         iscsit_stop_nopin_response_timer(conn);
4171         iscsit_stop_nopin_timer(conn);
4172
4173         if (conn->conn_transport->iscsit_wait_conn)
4174                 conn->conn_transport->iscsit_wait_conn(conn);
4175
4176         /*
4177          * During Connection recovery drop unacknowledged out of order
4178          * commands for this connection, and prepare the other commands
4179          * for reallegiance.
4180          *
4181          * During normal operation clear the out of order commands (but
4182          * do not free the struct iscsi_ooo_cmdsn's) and release all
4183          * struct iscsi_cmds.
4184          */
4185         if (atomic_read(&conn->connection_recovery)) {
4186                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4187                 iscsit_prepare_cmds_for_reallegiance(conn);
4188         } else {
4189                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4190                 iscsit_release_commands_from_conn(conn);
4191         }
4192         iscsit_free_queue_reqs_for_conn(conn);
4193
4194         /*
4195          * Handle decrementing session or connection usage count if
4196          * a logout response was not able to be sent because the
4197          * connection failed.  Fall back to Session Recovery here.
4198          */
4199         if (atomic_read(&conn->conn_logout_remove)) {
4200                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4201                         iscsit_dec_conn_usage_count(conn);
4202                         iscsit_dec_session_usage_count(sess);
4203                 }
4204                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4205                         iscsit_dec_conn_usage_count(conn);
4206
4207                 atomic_set(&conn->conn_logout_remove, 0);
4208                 atomic_set(&sess->session_reinstatement, 0);
4209                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4210         }
4211
4212         spin_lock_bh(&sess->conn_lock);
4213         list_del(&conn->conn_list);
4214
4215         /*
4216          * Attempt to let the Initiator know this connection failed by
4217          * sending an Connection Dropped Async Message on another
4218          * active connection.
4219          */
4220         if (atomic_read(&conn->connection_recovery))
4221                 iscsit_build_conn_drop_async_message(conn);
4222
4223         spin_unlock_bh(&sess->conn_lock);
4224
4225         /*
4226          * If connection reinstatement is being performed on this connection,
4227          * up the connection reinstatement semaphore that is being blocked on
4228          * in iscsit_cause_connection_reinstatement().
4229          */
4230         spin_lock_bh(&conn->state_lock);
4231         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4232                 spin_unlock_bh(&conn->state_lock);
4233                 complete(&conn->conn_wait_comp);
4234                 wait_for_completion(&conn->conn_post_wait_comp);
4235                 spin_lock_bh(&conn->state_lock);
4236         }
4237
4238         /*
4239          * If connection reinstatement is being performed on this connection
4240          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4241          * connection wait rcfr semaphore that is being blocked on
4242          * an iscsit_connection_reinstatement_rcfr().
4243          */
4244         if (atomic_read(&conn->connection_wait_rcfr)) {
4245                 spin_unlock_bh(&conn->state_lock);
4246                 complete(&conn->conn_wait_rcfr_comp);
4247                 wait_for_completion(&conn->conn_post_wait_comp);
4248                 spin_lock_bh(&conn->state_lock);
4249         }
4250         atomic_set(&conn->connection_reinstatement, 1);
4251         spin_unlock_bh(&conn->state_lock);
4252
4253         /*
4254          * If any other processes are accessing this connection pointer we
4255          * must wait until they have completed.
4256          */
4257         iscsit_check_conn_usage_count(conn);
4258
4259         ahash_request_free(conn->conn_tx_hash);
4260         if (conn->conn_rx_hash) {
4261                 struct crypto_ahash *tfm;
4262
4263                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4264                 ahash_request_free(conn->conn_rx_hash);
4265                 crypto_free_ahash(tfm);
4266         }
4267
4268         if (conn->sock)
4269                 sock_release(conn->sock);
4270
4271         if (conn->conn_transport->iscsit_free_conn)
4272                 conn->conn_transport->iscsit_free_conn(conn);
4273
4274         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4275         conn->conn_state = TARG_CONN_STATE_FREE;
4276         iscsit_free_conn(conn);
4277
4278         spin_lock_bh(&sess->conn_lock);
4279         atomic_dec(&sess->nconn);
4280         pr_debug("Decremented iSCSI connection count to %hu from node:"
4281                 " %s\n", atomic_read(&sess->nconn),
4282                 sess->sess_ops->InitiatorName);
4283         /*
4284          * Make sure that if one connection fails in an non ERL=2 iSCSI
4285          * Session that they all fail.
4286          */
4287         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4288              !atomic_read(&sess->session_logout))
4289                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4290
4291         /*
4292          * If this was not the last connection in the session, and we are
4293          * performing session reinstatement or falling back to ERL=0, call
4294          * iscsit_stop_session() without sleeping to shutdown the other
4295          * active connections.
4296          */
4297         if (atomic_read(&sess->nconn)) {
4298                 if (!atomic_read(&sess->session_reinstatement) &&
4299                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4300                         spin_unlock_bh(&sess->conn_lock);
4301                         return 0;
4302                 }
4303                 if (!atomic_read(&sess->session_stop_active)) {
4304                         atomic_set(&sess->session_stop_active, 1);
4305                         spin_unlock_bh(&sess->conn_lock);
4306                         iscsit_stop_session(sess, 0, 0);
4307                         return 0;
4308                 }
4309                 spin_unlock_bh(&sess->conn_lock);
4310                 return 0;
4311         }
4312
4313         /*
4314          * If this was the last connection in the session and one of the
4315          * following is occurring:
4316          *
4317          * Session Reinstatement is not being performed, and are falling back
4318          * to ERL=0 call iscsit_close_session().
4319          *
4320          * Session Logout was requested.  iscsit_close_session() will be called
4321          * elsewhere.
4322          *
4323          * Session Continuation is not being performed, start the Time2Retain
4324          * handler and check if sleep_on_sess_wait_sem is active.
4325          */
4326         if (!atomic_read(&sess->session_reinstatement) &&
4327              atomic_read(&sess->session_fall_back_to_erl0)) {
4328                 spin_unlock_bh(&sess->conn_lock);
4329                 complete_all(&sess->session_wait_comp);
4330                 iscsit_close_session(sess, true);
4331
4332                 return 0;
4333         } else if (atomic_read(&sess->session_logout)) {
4334                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4335                 sess->session_state = TARG_SESS_STATE_FREE;
4336
4337                 if (atomic_read(&sess->session_close)) {
4338                         spin_unlock_bh(&sess->conn_lock);
4339                         complete_all(&sess->session_wait_comp);
4340                         iscsit_close_session(sess, true);
4341                 } else {
4342                         spin_unlock_bh(&sess->conn_lock);
4343                 }
4344
4345                 return 0;
4346         } else {
4347                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4348                 sess->session_state = TARG_SESS_STATE_FAILED;
4349
4350                 if (!atomic_read(&sess->session_continuation))
4351                         iscsit_start_time2retain_handler(sess);
4352
4353                 if (atomic_read(&sess->session_close)) {
4354                         spin_unlock_bh(&sess->conn_lock);
4355                         complete_all(&sess->session_wait_comp);
4356                         iscsit_close_session(sess, true);
4357                 } else {
4358                         spin_unlock_bh(&sess->conn_lock);
4359                 }
4360
4361                 return 0;
4362         }
4363 }
4364
4365 /*
4366  * If the iSCSI Session for the iSCSI Initiator Node exists,
4367  * forcefully shutdown the iSCSI NEXUS.
4368  */
4369 int iscsit_close_session(struct iscsi_session *sess, bool can_sleep)
4370 {
4371         struct iscsi_portal_group *tpg = sess->tpg;
4372         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4373
4374         if (atomic_read(&sess->nconn)) {
4375                 pr_err("%d connection(s) still exist for iSCSI session"
4376                         " to %s\n", atomic_read(&sess->nconn),
4377                         sess->sess_ops->InitiatorName);
4378                 BUG();
4379         }
4380
4381         spin_lock_bh(&se_tpg->session_lock);
4382         atomic_set(&sess->session_logout, 1);
4383         atomic_set(&sess->session_reinstatement, 1);
4384         iscsit_stop_time2retain_timer(sess);
4385         spin_unlock_bh(&se_tpg->session_lock);
4386
4387         /*
4388          * transport_deregister_session_configfs() will clear the
4389          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4390          * can be setting it again with __transport_register_session() in
4391          * iscsi_post_login_handler() again after the iscsit_stop_session()
4392          * completes in iscsi_np context.
4393          */
4394         transport_deregister_session_configfs(sess->se_sess);
4395
4396         /*
4397          * If any other processes are accessing this session pointer we must
4398          * wait until they have completed.  If we are in an interrupt (the
4399          * time2retain handler) and contain and active session usage count we
4400          * restart the timer and exit.
4401          */
4402         if (iscsit_check_session_usage_count(sess, can_sleep)) {
4403                 atomic_set(&sess->session_logout, 0);
4404                 iscsit_start_time2retain_handler(sess);
4405                 return 0;
4406         }
4407
4408         transport_deregister_session(sess->se_sess);
4409
4410         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4411                 iscsit_free_connection_recovery_entries(sess);
4412
4413         iscsit_free_all_ooo_cmdsns(sess);
4414
4415         spin_lock_bh(&se_tpg->session_lock);
4416         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4417         sess->session_state = TARG_SESS_STATE_FREE;
4418         pr_debug("Released iSCSI session from node: %s\n",
4419                         sess->sess_ops->InitiatorName);
4420         tpg->nsessions--;
4421         if (tpg->tpg_tiqn)
4422                 tpg->tpg_tiqn->tiqn_nsessions--;
4423
4424         pr_debug("Decremented number of active iSCSI Sessions on"
4425                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4426
4427         ida_free(&sess_ida, sess->session_index);
4428         kfree(sess->sess_ops);
4429         sess->sess_ops = NULL;
4430         spin_unlock_bh(&se_tpg->session_lock);
4431
4432         kfree(sess);
4433         return 0;
4434 }
4435
4436 static void iscsit_logout_post_handler_closesession(
4437         struct iscsi_conn *conn)
4438 {
4439         struct iscsi_session *sess = conn->sess;
4440         int sleep = 1;
4441         /*
4442          * Traditional iscsi/tcp will invoke this logic from TX thread
4443          * context during session logout, so clear tx_thread_active and
4444          * sleep if iscsit_close_connection() has not already occured.
4445          *
4446          * Since iser-target invokes this logic from it's own workqueue,
4447          * always sleep waiting for RX/TX thread shutdown to complete
4448          * within iscsit_close_connection().
4449          */
4450         if (!conn->conn_transport->rdma_shutdown) {
4451                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4452                 if (!sleep)
4453                         return;
4454         }
4455
4456         atomic_set(&conn->conn_logout_remove, 0);
4457         complete(&conn->conn_logout_comp);
4458
4459         iscsit_dec_conn_usage_count(conn);
4460         atomic_set(&sess->session_close, 1);
4461         iscsit_stop_session(sess, sleep, sleep);
4462         iscsit_dec_session_usage_count(sess);
4463 }
4464
4465 static void iscsit_logout_post_handler_samecid(
4466         struct iscsi_conn *conn)
4467 {
4468         int sleep = 1;
4469
4470         if (!conn->conn_transport->rdma_shutdown) {
4471                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4472                 if (!sleep)
4473                         return;
4474         }
4475
4476         atomic_set(&conn->conn_logout_remove, 0);
4477         complete(&conn->conn_logout_comp);
4478
4479         iscsit_cause_connection_reinstatement(conn, sleep);
4480         iscsit_dec_conn_usage_count(conn);
4481 }
4482
4483 static void iscsit_logout_post_handler_diffcid(
4484         struct iscsi_conn *conn,
4485         u16 cid)
4486 {
4487         struct iscsi_conn *l_conn;
4488         struct iscsi_session *sess = conn->sess;
4489         bool conn_found = false;
4490
4491         if (!sess)
4492                 return;
4493
4494         spin_lock_bh(&sess->conn_lock);
4495         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4496                 if (l_conn->cid == cid) {
4497                         iscsit_inc_conn_usage_count(l_conn);
4498                         conn_found = true;
4499                         break;
4500                 }
4501         }
4502         spin_unlock_bh(&sess->conn_lock);
4503
4504         if (!conn_found)
4505                 return;
4506
4507         if (l_conn->sock)
4508                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4509
4510         spin_lock_bh(&l_conn->state_lock);
4511         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4512         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4513         spin_unlock_bh(&l_conn->state_lock);
4514
4515         iscsit_cause_connection_reinstatement(l_conn, 1);
4516         iscsit_dec_conn_usage_count(l_conn);
4517 }
4518
4519 /*
4520  *      Return of 0 causes the TX thread to restart.
4521  */
4522 int iscsit_logout_post_handler(
4523         struct iscsi_cmd *cmd,
4524         struct iscsi_conn *conn)
4525 {
4526         int ret = 0;
4527
4528         switch (cmd->logout_reason) {
4529         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4530                 switch (cmd->logout_response) {
4531                 case ISCSI_LOGOUT_SUCCESS:
4532                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4533                 default:
4534                         iscsit_logout_post_handler_closesession(conn);
4535                         break;
4536                 }
4537                 break;
4538         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4539                 if (conn->cid == cmd->logout_cid) {
4540                         switch (cmd->logout_response) {
4541                         case ISCSI_LOGOUT_SUCCESS:
4542                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4543                         default:
4544                                 iscsit_logout_post_handler_samecid(conn);
4545                                 break;
4546                         }
4547                 } else {
4548                         switch (cmd->logout_response) {
4549                         case ISCSI_LOGOUT_SUCCESS:
4550                                 iscsit_logout_post_handler_diffcid(conn,
4551                                         cmd->logout_cid);
4552                                 break;
4553                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4554                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4555                         default:
4556                                 break;
4557                         }
4558                         ret = 1;
4559                 }
4560                 break;
4561         case ISCSI_LOGOUT_REASON_RECOVERY:
4562                 switch (cmd->logout_response) {
4563                 case ISCSI_LOGOUT_SUCCESS:
4564                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4565                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4566                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4567                 default:
4568                         break;
4569                 }
4570                 ret = 1;
4571                 break;
4572         default:
4573                 break;
4574
4575         }
4576         return ret;
4577 }
4578 EXPORT_SYMBOL(iscsit_logout_post_handler);
4579
4580 void iscsit_fail_session(struct iscsi_session *sess)
4581 {
4582         struct iscsi_conn *conn;
4583
4584         spin_lock_bh(&sess->conn_lock);
4585         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4586                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4587                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4588         }
4589         spin_unlock_bh(&sess->conn_lock);
4590
4591         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4592         sess->session_state = TARG_SESS_STATE_FAILED;
4593 }
4594
4595 void iscsit_stop_session(
4596         struct iscsi_session *sess,
4597         int session_sleep,
4598         int connection_sleep)
4599 {
4600         u16 conn_count = atomic_read(&sess->nconn);
4601         struct iscsi_conn *conn, *conn_tmp = NULL;
4602         int is_last;
4603
4604         spin_lock_bh(&sess->conn_lock);
4605
4606         if (connection_sleep) {
4607                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4608                                 conn_list) {
4609                         if (conn_count == 0)
4610                                 break;
4611
4612                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4613                                 is_last = 1;
4614                         } else {
4615                                 iscsit_inc_conn_usage_count(conn_tmp);
4616                                 is_last = 0;
4617                         }
4618                         iscsit_inc_conn_usage_count(conn);
4619
4620                         spin_unlock_bh(&sess->conn_lock);
4621                         iscsit_cause_connection_reinstatement(conn, 1);
4622                         spin_lock_bh(&sess->conn_lock);
4623
4624                         iscsit_dec_conn_usage_count(conn);
4625                         if (is_last == 0)
4626                                 iscsit_dec_conn_usage_count(conn_tmp);
4627                         conn_count--;
4628                 }
4629         } else {
4630                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4631                         iscsit_cause_connection_reinstatement(conn, 0);
4632         }
4633
4634         if (session_sleep && atomic_read(&sess->nconn)) {
4635                 spin_unlock_bh(&sess->conn_lock);
4636                 wait_for_completion(&sess->session_wait_comp);
4637         } else
4638                 spin_unlock_bh(&sess->conn_lock);
4639 }
4640
4641 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4642 {
4643         struct iscsi_session *sess;
4644         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4645         struct se_session *se_sess, *se_sess_tmp;
4646         LIST_HEAD(free_list);
4647         int session_count = 0;
4648
4649         spin_lock_bh(&se_tpg->session_lock);
4650         if (tpg->nsessions && !force) {
4651                 spin_unlock_bh(&se_tpg->session_lock);
4652                 return -1;
4653         }
4654
4655         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4656                         sess_list) {
4657                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4658
4659                 spin_lock(&sess->conn_lock);
4660                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4661                     atomic_read(&sess->session_logout) ||
4662                     atomic_read(&sess->session_close) ||
4663                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4664                         spin_unlock(&sess->conn_lock);
4665                         continue;
4666                 }
4667                 iscsit_inc_session_usage_count(sess);
4668                 atomic_set(&sess->session_reinstatement, 1);
4669                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4670                 atomic_set(&sess->session_close, 1);
4671                 spin_unlock(&sess->conn_lock);
4672
4673                 list_move_tail(&se_sess->sess_list, &free_list);
4674         }
4675         spin_unlock_bh(&se_tpg->session_lock);
4676
4677         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4678                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4679
4680                 list_del_init(&se_sess->sess_list);
4681                 iscsit_stop_session(sess, 1, 1);
4682                 iscsit_dec_session_usage_count(sess);
4683                 session_count++;
4684         }
4685
4686         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4687                         " Group: %hu\n", session_count, tpg->tpgt);
4688         return 0;
4689 }
4690
4691 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4692 MODULE_VERSION("4.1.x");
4693 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4694 MODULE_LICENSE("GPL");
4695
4696 module_init(iscsi_target_init_module);
4697 module_exit(iscsi_target_cleanup_module);