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         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
1158                          conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1159                          cmd->data_direction, sam_task_attr,
1160                          cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1161
1162         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1163                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1164                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1165                 conn->cid);
1166
1167         target_get_sess_cmd(&cmd->se_cmd, true);
1168
1169         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170         cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb,
1171                                                 GFP_KERNEL);
1172
1173         if (cmd->sense_reason) {
1174                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1175                         return iscsit_add_reject_cmd(cmd,
1176                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1177                 }
1178
1179                 goto attach_cmd;
1180         }
1181
1182         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1183         if (cmd->sense_reason)
1184                 goto attach_cmd;
1185
1186         cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1187         if (cmd->sense_reason)
1188                 goto attach_cmd;
1189
1190         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1191                 return iscsit_add_reject_cmd(cmd,
1192                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1193         }
1194
1195 attach_cmd:
1196         spin_lock_bh(&conn->cmd_lock);
1197         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1198         spin_unlock_bh(&conn->cmd_lock);
1199         /*
1200          * Check if we need to delay processing because of ALUA
1201          * Active/NonOptimized primary access state..
1202          */
1203         core_alua_check_nonop_delay(&cmd->se_cmd);
1204
1205         return 0;
1206 }
1207 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1208
1209 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1210 {
1211         iscsit_set_dataout_sequence_values(cmd);
1212
1213         spin_lock_bh(&cmd->dataout_timeout_lock);
1214         iscsit_start_dataout_timer(cmd, cmd->conn);
1215         spin_unlock_bh(&cmd->dataout_timeout_lock);
1216 }
1217 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1218
1219 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1220                             struct iscsi_scsi_req *hdr)
1221 {
1222         int cmdsn_ret = 0;
1223         /*
1224          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1225          * the Immediate Bit is not set, and no Immediate
1226          * Data is attached.
1227          *
1228          * A PDU/CmdSN carrying Immediate Data can only
1229          * be processed after the DataCRC has passed.
1230          * If the DataCRC fails, the CmdSN MUST NOT
1231          * be acknowledged. (See below)
1232          */
1233         if (!cmd->immediate_data) {
1234                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1235                                         (unsigned char *)hdr, hdr->cmdsn);
1236                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1237                         return -1;
1238                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1239                         target_put_sess_cmd(&cmd->se_cmd);
1240                         return 0;
1241                 }
1242         }
1243
1244         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1245
1246         /*
1247          * If no Immediate Data is attached, it's OK to return now.
1248          */
1249         if (!cmd->immediate_data) {
1250                 if (!cmd->sense_reason && cmd->unsolicited_data)
1251                         iscsit_set_unsolicited_dataout(cmd);
1252                 if (!cmd->sense_reason)
1253                         return 0;
1254
1255                 target_put_sess_cmd(&cmd->se_cmd);
1256                 return 0;
1257         }
1258
1259         /*
1260          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1261          * execution.  These exceptions are processed in CmdSN order using
1262          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1263          */
1264         if (cmd->sense_reason)
1265                 return 1;
1266         /*
1267          * Call directly into transport_generic_new_cmd() to perform
1268          * the backend memory allocation.
1269          */
1270         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1271         if (cmd->sense_reason)
1272                 return 1;
1273
1274         return 0;
1275 }
1276 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1277
1278 static int
1279 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1280                           bool dump_payload)
1281 {
1282         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1283         int rc;
1284
1285         /*
1286          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1287          */
1288         if (dump_payload) {
1289                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1290                                  cmd->first_burst_len);
1291
1292                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1293                          cmd->se_cmd.data_length, cmd->write_data_done,
1294                          cmd->first_burst_len, length);
1295                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1296                 pr_debug("Finished dumping immediate data\n");
1297                 if (rc < 0)
1298                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1299         } else {
1300                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1301                                                          cmd->first_burst_len);
1302         }
1303
1304         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1305                 /*
1306                  * A PDU/CmdSN carrying Immediate Data passed
1307                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1308                  * Immediate Bit is not set.
1309                  */
1310                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1311                                         (unsigned char *)hdr, hdr->cmdsn);
1312                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1313                         return -1;
1314
1315                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1316                         target_put_sess_cmd(&cmd->se_cmd);
1317
1318                         return 0;
1319                 } else if (cmd->unsolicited_data)
1320                         iscsit_set_unsolicited_dataout(cmd);
1321
1322         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1323                 /*
1324                  * Immediate Data failed DataCRC and ERL>=1,
1325                  * silently drop this PDU and let the initiator
1326                  * plug the CmdSN gap.
1327                  *
1328                  * FIXME: Send Unsolicited NOPIN with reserved
1329                  * TTT here to help the initiator figure out
1330                  * the missing CmdSN, although they should be
1331                  * intelligent enough to determine the missing
1332                  * CmdSN and issue a retry to plug the sequence.
1333                  */
1334                 cmd->i_state = ISTATE_REMOVE;
1335                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1336         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1337                 return -1;
1338
1339         return 0;
1340 }
1341
1342 static int
1343 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1344                            unsigned char *buf)
1345 {
1346         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1347         int rc, immed_data;
1348         bool dump_payload = false;
1349
1350         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1351         if (rc < 0)
1352                 return 0;
1353         /*
1354          * Allocation iovecs needed for struct socket operations for
1355          * traditional iSCSI block I/O.
1356          */
1357         if (iscsit_allocate_iovecs(cmd) < 0) {
1358                 return iscsit_reject_cmd(cmd,
1359                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1360         }
1361         immed_data = cmd->immediate_data;
1362
1363         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1364         if (rc < 0)
1365                 return rc;
1366         else if (rc > 0)
1367                 dump_payload = true;
1368
1369         if (!immed_data)
1370                 return 0;
1371
1372         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1373 }
1374
1375 static u32 iscsit_do_crypto_hash_sg(
1376         struct ahash_request *hash,
1377         struct iscsi_cmd *cmd,
1378         u32 data_offset,
1379         u32 data_length,
1380         u32 padding,
1381         u8 *pad_bytes)
1382 {
1383         u32 data_crc;
1384         struct scatterlist *sg;
1385         unsigned int page_off;
1386
1387         crypto_ahash_init(hash);
1388
1389         sg = cmd->first_data_sg;
1390         page_off = cmd->first_data_sg_off;
1391
1392         if (data_length && page_off) {
1393                 struct scatterlist first_sg;
1394                 u32 len = min_t(u32, data_length, sg->length - page_off);
1395
1396                 sg_init_table(&first_sg, 1);
1397                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1398
1399                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1400                 crypto_ahash_update(hash);
1401
1402                 data_length -= len;
1403                 sg = sg_next(sg);
1404         }
1405
1406         while (data_length) {
1407                 u32 cur_len = min_t(u32, data_length, sg->length);
1408
1409                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1410                 crypto_ahash_update(hash);
1411
1412                 data_length -= cur_len;
1413                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1414                 sg = sg_next(sg);
1415         }
1416
1417         if (padding) {
1418                 struct scatterlist pad_sg;
1419
1420                 sg_init_one(&pad_sg, pad_bytes, padding);
1421                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1422                                         padding);
1423                 crypto_ahash_finup(hash);
1424         } else {
1425                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1426                 crypto_ahash_final(hash);
1427         }
1428
1429         return data_crc;
1430 }
1431
1432 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1433         const void *buf, u32 payload_length, u32 padding,
1434         const void *pad_bytes, void *data_crc)
1435 {
1436         struct scatterlist sg[2];
1437
1438         sg_init_table(sg, ARRAY_SIZE(sg));
1439         sg_set_buf(sg, buf, payload_length);
1440         if (padding)
1441                 sg_set_buf(sg + 1, pad_bytes, padding);
1442
1443         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1444
1445         crypto_ahash_digest(hash);
1446 }
1447
1448 int
1449 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1450                            struct iscsi_cmd *cmd, u32 payload_length,
1451                            bool *success)
1452 {
1453         struct iscsi_data *hdr = buf;
1454         struct se_cmd *se_cmd;
1455         int rc;
1456
1457         /* iSCSI write */
1458         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1459
1460         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1461                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1462                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1463                 payload_length, conn->cid);
1464
1465         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1466                 pr_err("Command ITT: 0x%08x received DataOUT after"
1467                         " last DataOUT received, dumping payload\n",
1468                         cmd->init_task_tag);
1469                 return iscsit_dump_data_payload(conn, payload_length, 1);
1470         }
1471
1472         if (cmd->data_direction != DMA_TO_DEVICE) {
1473                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1474                         " NON-WRITE command.\n", cmd->init_task_tag);
1475                 return iscsit_dump_data_payload(conn, payload_length, 1);
1476         }
1477         se_cmd = &cmd->se_cmd;
1478         iscsit_mod_dataout_timer(cmd);
1479
1480         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1481                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1482                        be32_to_cpu(hdr->offset), payload_length,
1483                        cmd->se_cmd.data_length);
1484                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1485         }
1486
1487         if (cmd->unsolicited_data) {
1488                 int dump_unsolicited_data = 0;
1489
1490                 if (conn->sess->sess_ops->InitialR2T) {
1491                         pr_err("Received unexpected unsolicited data"
1492                                 " while InitialR2T=Yes, protocol error.\n");
1493                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1494                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1495                         return -1;
1496                 }
1497                 /*
1498                  * Special case for dealing with Unsolicited DataOUT
1499                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1500                  * failures;
1501                  */
1502
1503                 /* Something's amiss if we're not in WRITE_PENDING state... */
1504                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1505                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1506                         dump_unsolicited_data = 1;
1507
1508                 if (dump_unsolicited_data) {
1509                         /*
1510                          * Check if a delayed TASK_ABORTED status needs to
1511                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1512                          * received with the unsolicited data out.
1513                          */
1514                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1515                                 iscsit_stop_dataout_timer(cmd);
1516
1517                         return iscsit_dump_data_payload(conn, payload_length, 1);
1518                 }
1519         } else {
1520                 /*
1521                  * For the normal solicited data path:
1522                  *
1523                  * Check for a delayed TASK_ABORTED status and dump any
1524                  * incoming data out payload if one exists.  Also, when the
1525                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1526                  * data out sequence, we decrement outstanding_r2ts.  Once
1527                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1528                  * TASK_ABORTED status.
1529                  */
1530                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1531                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1532                             --cmd->outstanding_r2ts < 1)
1533                                 iscsit_stop_dataout_timer(cmd);
1534
1535                         return iscsit_dump_data_payload(conn, payload_length, 1);
1536                 }
1537         }
1538         /*
1539          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1540          * within-command recovery checks before receiving the payload.
1541          */
1542         rc = iscsit_check_pre_dataout(cmd, buf);
1543         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1544                 return 0;
1545         else if (rc == DATAOUT_CANNOT_RECOVER)
1546                 return -1;
1547         *success = true;
1548         return 0;
1549 }
1550 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1551
1552 int
1553 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1554                          struct iscsi_cmd **out_cmd)
1555 {
1556         struct iscsi_data *hdr = buf;
1557         struct iscsi_cmd *cmd;
1558         u32 payload_length = ntoh24(hdr->dlength);
1559         int rc;
1560         bool success = false;
1561
1562         if (!payload_length) {
1563                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1564                 return 0;
1565         }
1566
1567         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1568                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1569                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1570                         conn->conn_ops->MaxXmitDataSegmentLength);
1571                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1572         }
1573
1574         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1575         if (!cmd)
1576                 return 0;
1577
1578         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1579
1580         if (success)
1581                 *out_cmd = cmd;
1582
1583         return rc;
1584 }
1585 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1586
1587 static int
1588 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589                    struct iscsi_data *hdr)
1590 {
1591         struct kvec *iov;
1592         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1593         u32 payload_length;
1594         int iov_ret, data_crc_failed = 0;
1595
1596         payload_length = min_t(u32, cmd->se_cmd.data_length,
1597                                ntoh24(hdr->dlength));
1598         rx_size += payload_length;
1599         iov = &cmd->iov_data[0];
1600
1601         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1602                                    be32_to_cpu(hdr->offset), payload_length);
1603         if (iov_ret < 0)
1604                 return -1;
1605
1606         iov_count += iov_ret;
1607
1608         padding = ((-payload_length) & 3);
1609         if (padding != 0) {
1610                 iov[iov_count].iov_base = cmd->pad_bytes;
1611                 iov[iov_count++].iov_len = padding;
1612                 rx_size += padding;
1613                 pr_debug("Receiving %u padding bytes.\n", padding);
1614         }
1615
1616         if (conn->conn_ops->DataDigest) {
1617                 iov[iov_count].iov_base = &checksum;
1618                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1619                 rx_size += ISCSI_CRC_LEN;
1620         }
1621
1622         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1623         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1624
1625         iscsit_unmap_iovec(cmd);
1626
1627         if (rx_got != rx_size)
1628                 return -1;
1629
1630         if (conn->conn_ops->DataDigest) {
1631                 u32 data_crc;
1632
1633                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1634                                                     be32_to_cpu(hdr->offset),
1635                                                     payload_length, padding,
1636                                                     cmd->pad_bytes);
1637
1638                 if (checksum != data_crc) {
1639                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1640                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1641                                 " does not match computed 0x%08x\n",
1642                                 hdr->itt, hdr->offset, payload_length,
1643                                 hdr->datasn, checksum, data_crc);
1644                         data_crc_failed = 1;
1645                 } else {
1646                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1647                                 " %u bytes of Data Out\n", checksum,
1648                                 payload_length);
1649                 }
1650         }
1651
1652         return data_crc_failed;
1653 }
1654
1655 int
1656 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1657                              bool data_crc_failed)
1658 {
1659         struct iscsi_conn *conn = cmd->conn;
1660         int rc, ooo_cmdsn;
1661         /*
1662          * Increment post receive data and CRC values or perform
1663          * within-command recovery.
1664          */
1665         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1666         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1667                 return 0;
1668         else if (rc == DATAOUT_SEND_R2T) {
1669                 iscsit_set_dataout_sequence_values(cmd);
1670                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1671         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1672                 /*
1673                  * Handle extra special case for out of order
1674                  * Unsolicited Data Out.
1675                  */
1676                 spin_lock_bh(&cmd->istate_lock);
1677                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1678                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1679                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1680                 spin_unlock_bh(&cmd->istate_lock);
1681
1682                 iscsit_stop_dataout_timer(cmd);
1683                 if (ooo_cmdsn)
1684                         return 0;
1685                 target_execute_cmd(&cmd->se_cmd);
1686                 return 0;
1687         } else /* DATAOUT_CANNOT_RECOVER */
1688                 return -1;
1689
1690         return 0;
1691 }
1692 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1693
1694 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1695 {
1696         struct iscsi_cmd *cmd = NULL;
1697         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1698         int rc;
1699         bool data_crc_failed = false;
1700
1701         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1702         if (rc < 0)
1703                 return 0;
1704         else if (!cmd)
1705                 return 0;
1706
1707         rc = iscsit_get_dataout(conn, cmd, hdr);
1708         if (rc < 0)
1709                 return rc;
1710         else if (rc > 0)
1711                 data_crc_failed = true;
1712
1713         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1714 }
1715
1716 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1717                          struct iscsi_nopout *hdr)
1718 {
1719         u32 payload_length = ntoh24(hdr->dlength);
1720
1721         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1722                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1723                 if (!cmd)
1724                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725                                                  (unsigned char *)hdr);
1726
1727                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728                                          (unsigned char *)hdr);
1729         }
1730
1731         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1732                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1733                         " not set, protocol error.\n");
1734                 if (!cmd)
1735                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1736                                                  (unsigned char *)hdr);
1737
1738                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1739                                          (unsigned char *)hdr);
1740         }
1741
1742         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1743                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1744                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1745                         " error.\n", payload_length,
1746                         conn->conn_ops->MaxXmitDataSegmentLength);
1747                 if (!cmd)
1748                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1749                                                  (unsigned char *)hdr);
1750
1751                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1752                                          (unsigned char *)hdr);
1753         }
1754
1755         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1756                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1757                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1758                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1759                 payload_length);
1760         /*
1761          * This is not a response to a Unsolicited NopIN, which means
1762          * it can either be a NOPOUT ping request (with a valid ITT),
1763          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1764          * Either way, make sure we allocate an struct iscsi_cmd, as both
1765          * can contain ping data.
1766          */
1767         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1768                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1769                 cmd->i_state            = ISTATE_SEND_NOPIN;
1770                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1771                                                 1 : 0);
1772                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1773                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1774                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1775                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1776                 cmd->data_direction     = DMA_NONE;
1777         }
1778
1779         return 0;
1780 }
1781 EXPORT_SYMBOL(iscsit_setup_nop_out);
1782
1783 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1784                            struct iscsi_nopout *hdr)
1785 {
1786         struct iscsi_cmd *cmd_p = NULL;
1787         int cmdsn_ret = 0;
1788         /*
1789          * Initiator is expecting a NopIN ping reply..
1790          */
1791         if (hdr->itt != RESERVED_ITT) {
1792                 if (!cmd)
1793                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1794                                                 (unsigned char *)hdr);
1795
1796                 spin_lock_bh(&conn->cmd_lock);
1797                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1798                 spin_unlock_bh(&conn->cmd_lock);
1799
1800                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1801
1802                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1803                         iscsit_add_cmd_to_response_queue(cmd, conn,
1804                                                          cmd->i_state);
1805                         return 0;
1806                 }
1807
1808                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1809                                 (unsigned char *)hdr, hdr->cmdsn);
1810                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1811                         return 0;
1812                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1813                         return -1;
1814
1815                 return 0;
1816         }
1817         /*
1818          * This was a response to a unsolicited NOPIN ping.
1819          */
1820         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1821                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1822                 if (!cmd_p)
1823                         return -EINVAL;
1824
1825                 iscsit_stop_nopin_response_timer(conn);
1826
1827                 cmd_p->i_state = ISTATE_REMOVE;
1828                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1829
1830                 iscsit_start_nopin_timer(conn);
1831                 return 0;
1832         }
1833         /*
1834          * Otherwise, initiator is not expecting a NOPIN is response.
1835          * Just ignore for now.
1836          */
1837
1838         if (cmd)
1839                 iscsit_free_cmd(cmd, false);
1840
1841         return 0;
1842 }
1843 EXPORT_SYMBOL(iscsit_process_nop_out);
1844
1845 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1846                                  unsigned char *buf)
1847 {
1848         unsigned char *ping_data = NULL;
1849         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1850         struct kvec *iov = NULL;
1851         u32 payload_length = ntoh24(hdr->dlength);
1852         int ret;
1853
1854         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1855         if (ret < 0)
1856                 return 0;
1857         /*
1858          * Handle NOP-OUT payload for traditional iSCSI sockets
1859          */
1860         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1861                 u32 checksum, data_crc, padding = 0;
1862                 int niov = 0, rx_got, rx_size = payload_length;
1863
1864                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1865                 if (!ping_data) {
1866                         ret = -1;
1867                         goto out;
1868                 }
1869
1870                 iov = &cmd->iov_misc[0];
1871                 iov[niov].iov_base      = ping_data;
1872                 iov[niov++].iov_len     = payload_length;
1873
1874                 padding = ((-payload_length) & 3);
1875                 if (padding != 0) {
1876                         pr_debug("Receiving %u additional bytes"
1877                                 " for padding.\n", padding);
1878                         iov[niov].iov_base      = &cmd->pad_bytes;
1879                         iov[niov++].iov_len     = padding;
1880                         rx_size += padding;
1881                 }
1882                 if (conn->conn_ops->DataDigest) {
1883                         iov[niov].iov_base      = &checksum;
1884                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1885                         rx_size += ISCSI_CRC_LEN;
1886                 }
1887
1888                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1889                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1890                 if (rx_got != rx_size) {
1891                         ret = -1;
1892                         goto out;
1893                 }
1894
1895                 if (conn->conn_ops->DataDigest) {
1896                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1897                                                   payload_length, padding,
1898                                                   cmd->pad_bytes, &data_crc);
1899
1900                         if (checksum != data_crc) {
1901                                 pr_err("Ping data CRC32C DataDigest"
1902                                 " 0x%08x does not match computed 0x%08x\n",
1903                                         checksum, data_crc);
1904                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1905                                         pr_err("Unable to recover from"
1906                                         " NOPOUT Ping DataCRC failure while in"
1907                                                 " ERL=0.\n");
1908                                         ret = -1;
1909                                         goto out;
1910                                 } else {
1911                                         /*
1912                                          * Silently drop this PDU and let the
1913                                          * initiator plug the CmdSN gap.
1914                                          */
1915                                         pr_debug("Dropping NOPOUT"
1916                                         " Command CmdSN: 0x%08x due to"
1917                                         " DataCRC error.\n", hdr->cmdsn);
1918                                         ret = 0;
1919                                         goto out;
1920                                 }
1921                         } else {
1922                                 pr_debug("Got CRC32C DataDigest"
1923                                 " 0x%08x for %u bytes of ping data.\n",
1924                                         checksum, payload_length);
1925                         }
1926                 }
1927
1928                 ping_data[payload_length] = '\0';
1929                 /*
1930                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1931                  */
1932                 cmd->buf_ptr = ping_data;
1933                 cmd->buf_ptr_size = payload_length;
1934
1935                 pr_debug("Got %u bytes of NOPOUT ping"
1936                         " data.\n", payload_length);
1937                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1938         }
1939
1940         return iscsit_process_nop_out(conn, cmd, hdr);
1941 out:
1942         if (cmd)
1943                 iscsit_free_cmd(cmd, false);
1944
1945         kfree(ping_data);
1946         return ret;
1947 }
1948
1949 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1950 {
1951         switch (iscsi_tmf) {
1952         case ISCSI_TM_FUNC_ABORT_TASK:
1953                 return TMR_ABORT_TASK;
1954         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1955                 return TMR_ABORT_TASK_SET;
1956         case ISCSI_TM_FUNC_CLEAR_ACA:
1957                 return TMR_CLEAR_ACA;
1958         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1959                 return TMR_CLEAR_TASK_SET;
1960         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1961                 return TMR_LUN_RESET;
1962         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1963                 return TMR_TARGET_WARM_RESET;
1964         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1965                 return TMR_TARGET_COLD_RESET;
1966         default:
1967                 return TMR_UNKNOWN;
1968         }
1969 }
1970
1971 int
1972 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1973                            unsigned char *buf)
1974 {
1975         struct se_tmr_req *se_tmr;
1976         struct iscsi_tmr_req *tmr_req;
1977         struct iscsi_tm *hdr;
1978         int out_of_order_cmdsn = 0, ret;
1979         u8 function, tcm_function = TMR_UNKNOWN;
1980
1981         hdr                     = (struct iscsi_tm *) buf;
1982         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1983         function = hdr->flags;
1984
1985         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1986                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1987                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1988                 hdr->rtt, hdr->refcmdsn, conn->cid);
1989
1990         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1991             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1992              hdr->rtt != RESERVED_ITT)) {
1993                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1994                 hdr->rtt = RESERVED_ITT;
1995         }
1996
1997         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1998                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1999                 pr_err("Task Management Request TASK_REASSIGN not"
2000                         " issued as immediate command, bad iSCSI Initiator"
2001                                 "implementation\n");
2002                 return iscsit_add_reject_cmd(cmd,
2003                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2004         }
2005         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2006             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2007                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2008
2009         cmd->data_direction = DMA_NONE;
2010         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2011         if (!cmd->tmr_req) {
2012                 return iscsit_add_reject_cmd(cmd,
2013                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2014                                              buf);
2015         }
2016
2017         __target_init_cmd(&cmd->se_cmd, &iscsi_ops,
2018                           conn->sess->se_sess, 0, DMA_NONE,
2019                           TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2020                           scsilun_to_int(&hdr->lun));
2021
2022         target_get_sess_cmd(&cmd->se_cmd, true);
2023
2024         /*
2025          * TASK_REASSIGN for ERL=2 / connection stays inside of
2026          * LIO-Target $FABRIC_MOD
2027          */
2028         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2029                 tcm_function = iscsit_convert_tmf(function);
2030                 if (tcm_function == TMR_UNKNOWN) {
2031                         pr_err("Unknown iSCSI TMR Function:"
2032                                " 0x%02x\n", function);
2033                         return iscsit_add_reject_cmd(cmd,
2034                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2035                 }
2036         }
2037         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2038                                  GFP_KERNEL);
2039         if (ret < 0)
2040                 return iscsit_add_reject_cmd(cmd,
2041                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2042
2043         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2044
2045         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2046         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2047         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2048         cmd->init_task_tag      = hdr->itt;
2049         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2050         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2051         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2052         se_tmr                  = cmd->se_cmd.se_tmr_req;
2053         tmr_req                 = cmd->tmr_req;
2054         /*
2055          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2056          */
2057         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2058                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2059                 if (ret < 0) {
2060                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2061                         goto attach;
2062                 }
2063         }
2064
2065         switch (function) {
2066         case ISCSI_TM_FUNC_ABORT_TASK:
2067                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2068                 if (se_tmr->response)
2069                         goto attach;
2070                 break;
2071         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2072         case ISCSI_TM_FUNC_CLEAR_ACA:
2073         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2074         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2075                 break;
2076         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2077                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2078                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2079                         goto attach;
2080                 }
2081                 break;
2082         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2083                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2084                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2085                         goto attach;
2086                 }
2087                 break;
2088         case ISCSI_TM_FUNC_TASK_REASSIGN:
2089                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2090                 /*
2091                  * Perform sanity checks on the ExpDataSN only if the
2092                  * TASK_REASSIGN was successful.
2093                  */
2094                 if (se_tmr->response)
2095                         break;
2096
2097                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2098                         return iscsit_add_reject_cmd(cmd,
2099                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2100                 break;
2101         default:
2102                 pr_err("Unknown TMR function: 0x%02x, protocol"
2103                         " error.\n", function);
2104                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2105                 goto attach;
2106         }
2107
2108         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2109             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2110                 se_tmr->call_transport = 1;
2111 attach:
2112         spin_lock_bh(&conn->cmd_lock);
2113         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2114         spin_unlock_bh(&conn->cmd_lock);
2115
2116         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2117                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2118                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2119                         out_of_order_cmdsn = 1;
2120                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2121                         target_put_sess_cmd(&cmd->se_cmd);
2122                         return 0;
2123                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2124                         return -1;
2125                 }
2126         }
2127         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2128
2129         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2130                 return 0;
2131         /*
2132          * Found the referenced task, send to transport for processing.
2133          */
2134         if (se_tmr->call_transport)
2135                 return transport_generic_handle_tmr(&cmd->se_cmd);
2136
2137         /*
2138          * Could not find the referenced LUN, task, or Task Management
2139          * command not authorized or supported.  Change state and
2140          * let the tx_thread send the response.
2141          *
2142          * For connection recovery, this is also the default action for
2143          * TMR TASK_REASSIGN.
2144          */
2145         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2146         target_put_sess_cmd(&cmd->se_cmd);
2147         return 0;
2148 }
2149 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2150
2151 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2152 int
2153 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2154                       struct iscsi_text *hdr)
2155 {
2156         u32 payload_length = ntoh24(hdr->dlength);
2157
2158         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2159                 pr_err("Unable to accept text parameter length: %u"
2160                         "greater than MaxXmitDataSegmentLength %u.\n",
2161                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2162                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2163                                          (unsigned char *)hdr);
2164         }
2165
2166         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2167              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2168                 pr_err("Multi sequence text commands currently not supported\n");
2169                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2170                                         (unsigned char *)hdr);
2171         }
2172
2173         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2174                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2175                 hdr->exp_statsn, payload_length);
2176
2177         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2178         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2179         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2180         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2181         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2182         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2183         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2184         cmd->data_direction     = DMA_NONE;
2185         kfree(cmd->text_in_ptr);
2186         cmd->text_in_ptr        = NULL;
2187
2188         return 0;
2189 }
2190 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2191
2192 int
2193 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2194                         struct iscsi_text *hdr)
2195 {
2196         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2197         int cmdsn_ret;
2198
2199         if (!text_in) {
2200                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2201                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2202                         pr_err("Unable to locate text_in buffer for sendtargets"
2203                                " discovery\n");
2204                         goto reject;
2205                 }
2206                 goto empty_sendtargets;
2207         }
2208         if (strncmp("SendTargets=", text_in, 12) != 0) {
2209                 pr_err("Received Text Data that is not"
2210                         " SendTargets, cannot continue.\n");
2211                 goto reject;
2212         }
2213         /* '=' confirmed in strncmp */
2214         text_ptr = strchr(text_in, '=');
2215         BUG_ON(!text_ptr);
2216         if (!strncmp("=All", text_ptr, 5)) {
2217                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2218         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2219                    !strncmp("=eui.", text_ptr, 5)) {
2220                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2221         } else {
2222                 pr_err("Unable to locate valid SendTargets%s value\n",
2223                        text_ptr);
2224                 goto reject;
2225         }
2226
2227         spin_lock_bh(&conn->cmd_lock);
2228         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2229         spin_unlock_bh(&conn->cmd_lock);
2230
2231 empty_sendtargets:
2232         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2233
2234         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2235                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2236                                 (unsigned char *)hdr, hdr->cmdsn);
2237                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2238                         return -1;
2239
2240                 return 0;
2241         }
2242
2243         return iscsit_execute_cmd(cmd, 0);
2244
2245 reject:
2246         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2247                                  (unsigned char *)hdr);
2248 }
2249 EXPORT_SYMBOL(iscsit_process_text_cmd);
2250
2251 static int
2252 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2253                        unsigned char *buf)
2254 {
2255         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2256         char *text_in = NULL;
2257         u32 payload_length = ntoh24(hdr->dlength);
2258         int rx_size, rc;
2259
2260         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2261         if (rc < 0)
2262                 return 0;
2263
2264         rx_size = payload_length;
2265         if (payload_length) {
2266                 u32 checksum = 0, data_crc = 0;
2267                 u32 padding = 0;
2268                 int niov = 0, rx_got;
2269                 struct kvec iov[2];
2270
2271                 rx_size = ALIGN(payload_length, 4);
2272                 text_in = kzalloc(rx_size, GFP_KERNEL);
2273                 if (!text_in)
2274                         goto reject;
2275
2276                 cmd->text_in_ptr = text_in;
2277
2278                 memset(iov, 0, sizeof(iov));
2279                 iov[niov].iov_base      = text_in;
2280                 iov[niov++].iov_len     = rx_size;
2281
2282                 padding = rx_size - payload_length;
2283                 if (padding)
2284                         pr_debug("Receiving %u additional bytes"
2285                                         " for padding.\n", padding);
2286                 if (conn->conn_ops->DataDigest) {
2287                         iov[niov].iov_base      = &checksum;
2288                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2289                         rx_size += ISCSI_CRC_LEN;
2290                 }
2291
2292                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2293                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2294                 if (rx_got != rx_size)
2295                         goto reject;
2296
2297                 if (conn->conn_ops->DataDigest) {
2298                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2299                                                   text_in, rx_size, 0, NULL,
2300                                                   &data_crc);
2301
2302                         if (checksum != data_crc) {
2303                                 pr_err("Text data CRC32C DataDigest"
2304                                         " 0x%08x does not match computed"
2305                                         " 0x%08x\n", checksum, data_crc);
2306                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2307                                         pr_err("Unable to recover from"
2308                                         " Text Data digest failure while in"
2309                                                 " ERL=0.\n");
2310                                         goto reject;
2311                                 } else {
2312                                         /*
2313                                          * Silently drop this PDU and let the
2314                                          * initiator plug the CmdSN gap.
2315                                          */
2316                                         pr_debug("Dropping Text"
2317                                         " Command CmdSN: 0x%08x due to"
2318                                         " DataCRC error.\n", hdr->cmdsn);
2319                                         kfree(text_in);
2320                                         return 0;
2321                                 }
2322                         } else {
2323                                 pr_debug("Got CRC32C DataDigest"
2324                                         " 0x%08x for %u bytes of text data.\n",
2325                                                 checksum, payload_length);
2326                         }
2327                 }
2328                 text_in[payload_length - 1] = '\0';
2329                 pr_debug("Successfully read %d bytes of text"
2330                                 " data.\n", payload_length);
2331         }
2332
2333         return iscsit_process_text_cmd(conn, cmd, hdr);
2334
2335 reject:
2336         kfree(cmd->text_in_ptr);
2337         cmd->text_in_ptr = NULL;
2338         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2339 }
2340
2341 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2342 {
2343         struct iscsi_conn *conn_p;
2344         struct iscsi_session *sess = conn->sess;
2345
2346         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2347                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2348
2349         atomic_set(&sess->session_logout, 1);
2350         atomic_set(&conn->conn_logout_remove, 1);
2351         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2352
2353         iscsit_inc_conn_usage_count(conn);
2354         iscsit_inc_session_usage_count(sess);
2355
2356         spin_lock_bh(&sess->conn_lock);
2357         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2358                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2359                         continue;
2360
2361                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2362                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2363         }
2364         spin_unlock_bh(&sess->conn_lock);
2365
2366         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2367
2368         return 0;
2369 }
2370
2371 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2372 {
2373         struct iscsi_conn *l_conn;
2374         struct iscsi_session *sess = conn->sess;
2375
2376         pr_debug("Received logout request CLOSECONNECTION for CID:"
2377                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2378
2379         /*
2380          * A Logout Request with a CLOSECONNECTION reason code for a CID
2381          * can arrive on a connection with a differing CID.
2382          */
2383         if (conn->cid == cmd->logout_cid) {
2384                 spin_lock_bh(&conn->state_lock);
2385                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2386                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2387
2388                 atomic_set(&conn->conn_logout_remove, 1);
2389                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2390                 iscsit_inc_conn_usage_count(conn);
2391
2392                 spin_unlock_bh(&conn->state_lock);
2393         } else {
2394                 /*
2395                  * Handle all different cid CLOSECONNECTION requests in
2396                  * iscsit_logout_post_handler_diffcid() as to give enough
2397                  * time for any non immediate command's CmdSN to be
2398                  * acknowledged on the connection in question.
2399                  *
2400                  * Here we simply make sure the CID is still around.
2401                  */
2402                 l_conn = iscsit_get_conn_from_cid(sess,
2403                                 cmd->logout_cid);
2404                 if (!l_conn) {
2405                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2406                         iscsit_add_cmd_to_response_queue(cmd, conn,
2407                                         cmd->i_state);
2408                         return 0;
2409                 }
2410
2411                 iscsit_dec_conn_usage_count(l_conn);
2412         }
2413
2414         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415
2416         return 0;
2417 }
2418
2419 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2420 {
2421         struct iscsi_session *sess = conn->sess;
2422
2423         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2424                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2425
2426         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2427                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2428                         " while ERL!=2.\n");
2429                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2430                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2431                 return 0;
2432         }
2433
2434         if (conn->cid == cmd->logout_cid) {
2435                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2436                         " with CID: %hu on CID: %hu, implementation error.\n",
2437                                 cmd->logout_cid, conn->cid);
2438                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2439                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2440                 return 0;
2441         }
2442
2443         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2444
2445         return 0;
2446 }
2447
2448 int
2449 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2450                         unsigned char *buf)
2451 {
2452         int cmdsn_ret, logout_remove = 0;
2453         u8 reason_code = 0;
2454         struct iscsi_logout *hdr;
2455         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2456
2457         hdr                     = (struct iscsi_logout *) buf;
2458         reason_code             = (hdr->flags & 0x7f);
2459
2460         if (tiqn) {
2461                 spin_lock(&tiqn->logout_stats.lock);
2462                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2463                         tiqn->logout_stats.normal_logouts++;
2464                 else
2465                         tiqn->logout_stats.abnormal_logouts++;
2466                 spin_unlock(&tiqn->logout_stats.lock);
2467         }
2468
2469         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2470                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2471                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2472                 hdr->cid, conn->cid);
2473
2474         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2475                 pr_err("Received logout request on connection that"
2476                         " is not in logged in state, ignoring request.\n");
2477                 iscsit_free_cmd(cmd, false);
2478                 return 0;
2479         }
2480
2481         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2482         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2483         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2484         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2485         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2486         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2487         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2488         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2489         cmd->logout_reason      = reason_code;
2490         cmd->data_direction     = DMA_NONE;
2491
2492         /*
2493          * We need to sleep in these cases (by returning 1) until the Logout
2494          * Response gets sent in the tx thread.
2495          */
2496         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2497            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2498             be16_to_cpu(hdr->cid) == conn->cid))
2499                 logout_remove = 1;
2500
2501         spin_lock_bh(&conn->cmd_lock);
2502         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2503         spin_unlock_bh(&conn->cmd_lock);
2504
2505         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2506                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2507
2508         /*
2509          * Immediate commands are executed, well, immediately.
2510          * Non-Immediate Logout Commands are executed in CmdSN order.
2511          */
2512         if (cmd->immediate_cmd) {
2513                 int ret = iscsit_execute_cmd(cmd, 0);
2514
2515                 if (ret < 0)
2516                         return ret;
2517         } else {
2518                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2519                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2520                         logout_remove = 0;
2521                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2522                         return -1;
2523         }
2524
2525         return logout_remove;
2526 }
2527 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2528
2529 int iscsit_handle_snack(
2530         struct iscsi_conn *conn,
2531         unsigned char *buf)
2532 {
2533         struct iscsi_snack *hdr;
2534
2535         hdr                     = (struct iscsi_snack *) buf;
2536         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2537
2538         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2539                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2540                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2541                         hdr->begrun, hdr->runlength, conn->cid);
2542
2543         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2544                 pr_err("Initiator sent SNACK request while in"
2545                         " ErrorRecoveryLevel=0.\n");
2546                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2547                                          buf);
2548         }
2549         /*
2550          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2551          * call from inside iscsi_send_recovery_datain_or_r2t().
2552          */
2553         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2554         case 0:
2555                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2556                         hdr->itt,
2557                         be32_to_cpu(hdr->ttt),
2558                         be32_to_cpu(hdr->begrun),
2559                         be32_to_cpu(hdr->runlength));
2560         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2561                 return iscsit_handle_status_snack(conn, hdr->itt,
2562                         be32_to_cpu(hdr->ttt),
2563                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2564         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2565                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2566                         be32_to_cpu(hdr->begrun),
2567                         be32_to_cpu(hdr->runlength));
2568         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2569                 /* FIXME: Support R-Data SNACK */
2570                 pr_err("R-Data SNACK Not Supported.\n");
2571                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572                                          buf);
2573         default:
2574                 pr_err("Unknown SNACK type 0x%02x, protocol"
2575                         " error.\n", hdr->flags & 0x0f);
2576                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2577                                          buf);
2578         }
2579
2580         return 0;
2581 }
2582 EXPORT_SYMBOL(iscsit_handle_snack);
2583
2584 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2585 {
2586         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2587             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2588                 wait_for_completion_interruptible_timeout(
2589                                         &conn->rx_half_close_comp,
2590                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2591         }
2592 }
2593
2594 static int iscsit_handle_immediate_data(
2595         struct iscsi_cmd *cmd,
2596         struct iscsi_scsi_req *hdr,
2597         u32 length)
2598 {
2599         int iov_ret, rx_got = 0, rx_size = 0;
2600         u32 checksum, iov_count = 0, padding = 0;
2601         struct iscsi_conn *conn = cmd->conn;
2602         struct kvec *iov;
2603         void *overflow_buf = NULL;
2604
2605         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2606         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2607         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2608                                    cmd->orig_iov_data_count - 2,
2609                                    cmd->write_data_done, rx_size);
2610         if (iov_ret < 0)
2611                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2612
2613         iov_count = iov_ret;
2614         iov = &cmd->iov_data[0];
2615         if (rx_size < length) {
2616                 /*
2617                  * Special case: length of immediate data exceeds the data
2618                  * buffer size derived from the CDB.
2619                  */
2620                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2621                 if (!overflow_buf) {
2622                         iscsit_unmap_iovec(cmd);
2623                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2624                 }
2625                 cmd->overflow_buf = overflow_buf;
2626                 iov[iov_count].iov_base = overflow_buf;
2627                 iov[iov_count].iov_len = length - rx_size;
2628                 iov_count++;
2629                 rx_size = length;
2630         }
2631
2632         padding = ((-length) & 3);
2633         if (padding != 0) {
2634                 iov[iov_count].iov_base = cmd->pad_bytes;
2635                 iov[iov_count++].iov_len = padding;
2636                 rx_size += padding;
2637         }
2638
2639         if (conn->conn_ops->DataDigest) {
2640                 iov[iov_count].iov_base         = &checksum;
2641                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2642                 rx_size += ISCSI_CRC_LEN;
2643         }
2644
2645         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2646         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2647
2648         iscsit_unmap_iovec(cmd);
2649
2650         if (rx_got != rx_size) {
2651                 iscsit_rx_thread_wait_for_tcp(conn);
2652                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2653         }
2654
2655         if (conn->conn_ops->DataDigest) {
2656                 u32 data_crc;
2657
2658                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2659                                                     cmd->write_data_done, length, padding,
2660                                                     cmd->pad_bytes);
2661
2662                 if (checksum != data_crc) {
2663                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2664                                 " does not match computed 0x%08x\n", checksum,
2665                                 data_crc);
2666
2667                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2668                                 pr_err("Unable to recover from"
2669                                         " Immediate Data digest failure while"
2670                                         " in ERL=0.\n");
2671                                 iscsit_reject_cmd(cmd,
2672                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2673                                                 (unsigned char *)hdr);
2674                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2675                         } else {
2676                                 iscsit_reject_cmd(cmd,
2677                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2678                                                 (unsigned char *)hdr);
2679                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2680                         }
2681                 } else {
2682                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2683                                 " %u bytes of Immediate Data\n", checksum,
2684                                 length);
2685                 }
2686         }
2687
2688         cmd->write_data_done += length;
2689
2690         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2691                 spin_lock_bh(&cmd->istate_lock);
2692                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2693                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2694                 spin_unlock_bh(&cmd->istate_lock);
2695         }
2696
2697         return IMMEDIATE_DATA_NORMAL_OPERATION;
2698 }
2699
2700 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2701         with active network interface */
2702 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2703 {
2704         struct iscsi_cmd *cmd;
2705         struct iscsi_conn *conn_p;
2706         bool found = false;
2707
2708         lockdep_assert_held(&conn->sess->conn_lock);
2709
2710         /*
2711          * Only send a Asynchronous Message on connections whos network
2712          * interface is still functional.
2713          */
2714         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2715                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2716                         iscsit_inc_conn_usage_count(conn_p);
2717                         found = true;
2718                         break;
2719                 }
2720         }
2721
2722         if (!found)
2723                 return;
2724
2725         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2726         if (!cmd) {
2727                 iscsit_dec_conn_usage_count(conn_p);
2728                 return;
2729         }
2730
2731         cmd->logout_cid = conn->cid;
2732         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2733         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2734
2735         spin_lock_bh(&conn_p->cmd_lock);
2736         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2737         spin_unlock_bh(&conn_p->cmd_lock);
2738
2739         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2740         iscsit_dec_conn_usage_count(conn_p);
2741 }
2742
2743 static int iscsit_send_conn_drop_async_message(
2744         struct iscsi_cmd *cmd,
2745         struct iscsi_conn *conn)
2746 {
2747         struct iscsi_async *hdr;
2748
2749         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2750
2751         hdr                     = (struct iscsi_async *) cmd->pdu;
2752         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2753         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2754         cmd->init_task_tag      = RESERVED_ITT;
2755         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2756         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2757         cmd->stat_sn            = conn->stat_sn++;
2758         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2759         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2760         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2761         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2762         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2763         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2764         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2765
2766         pr_debug("Sending Connection Dropped Async Message StatSN:"
2767                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2768                         cmd->logout_cid, conn->cid);
2769
2770         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2771 }
2772
2773 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2774 {
2775         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2776             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2777                 wait_for_completion_interruptible_timeout(
2778                                         &conn->tx_half_close_comp,
2779                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2780         }
2781 }
2782
2783 void
2784 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2785                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2786                         bool set_statsn)
2787 {
2788         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2789         hdr->flags              = datain->flags;
2790         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2791                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2792                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2793                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2794                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2795                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2796                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2797                 }
2798         }
2799         hton24(hdr->dlength, datain->length);
2800         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2801                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2802                                 (struct scsi_lun *)&hdr->lun);
2803         else
2804                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2805
2806         hdr->itt                = cmd->init_task_tag;
2807
2808         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2809                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2810         else
2811                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2812         if (set_statsn)
2813                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2814         else
2815                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2816
2817         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2818         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2819         hdr->datasn             = cpu_to_be32(datain->data_sn);
2820         hdr->offset             = cpu_to_be32(datain->offset);
2821
2822         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2823                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2824                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2825                 ntohl(hdr->offset), datain->length, conn->cid);
2826 }
2827 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2828
2829 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2830 {
2831         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2832         struct iscsi_datain datain;
2833         struct iscsi_datain_req *dr;
2834         int eodr = 0, ret;
2835         bool set_statsn = false;
2836
2837         memset(&datain, 0, sizeof(struct iscsi_datain));
2838         dr = iscsit_get_datain_values(cmd, &datain);
2839         if (!dr) {
2840                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2841                                 cmd->init_task_tag);
2842                 return -1;
2843         }
2844         /*
2845          * Be paranoid and double check the logic for now.
2846          */
2847         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2848                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2849                         " datain.length: %u exceeds cmd->data_length: %u\n",
2850                         cmd->init_task_tag, datain.offset, datain.length,
2851                         cmd->se_cmd.data_length);
2852                 return -1;
2853         }
2854
2855         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2856         /*
2857          * Special case for successfully execution w/ both DATAIN
2858          * and Sense Data.
2859          */
2860         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2861             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2862                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2863         else {
2864                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2865                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2866                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2867                         cmd->stat_sn = conn->stat_sn++;
2868                         set_statsn = true;
2869                 } else if (dr->dr_complete ==
2870                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2871                         set_statsn = true;
2872         }
2873
2874         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2875
2876         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2877         if (ret < 0)
2878                 return ret;
2879
2880         if (dr->dr_complete) {
2881                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2882                                 2 : 1;
2883                 iscsit_free_datain_req(cmd, dr);
2884         }
2885
2886         return eodr;
2887 }
2888
2889 int
2890 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2891                         struct iscsi_logout_rsp *hdr)
2892 {
2893         struct iscsi_conn *logout_conn = NULL;
2894         struct iscsi_conn_recovery *cr = NULL;
2895         struct iscsi_session *sess = conn->sess;
2896         /*
2897          * The actual shutting down of Sessions and/or Connections
2898          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2899          * is done in scsi_logout_post_handler().
2900          */
2901         switch (cmd->logout_reason) {
2902         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2903                 pr_debug("iSCSI session logout successful, setting"
2904                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2905                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2906                 break;
2907         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2908                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2909                         break;
2910                 /*
2911                  * For CLOSECONNECTION logout requests carrying
2912                  * a matching logout CID -> local CID, the reference
2913                  * for the local CID will have been incremented in
2914                  * iscsi_logout_closeconnection().
2915                  *
2916                  * For CLOSECONNECTION logout requests carrying
2917                  * a different CID than the connection it arrived
2918                  * on, the connection responding to cmd->logout_cid
2919                  * is stopped in iscsit_logout_post_handler_diffcid().
2920                  */
2921
2922                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2923                         " successful.\n", cmd->logout_cid, conn->cid);
2924                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2925                 break;
2926         case ISCSI_LOGOUT_REASON_RECOVERY:
2927                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2928                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2929                         break;
2930                 /*
2931                  * If the connection is still active from our point of view
2932                  * force connection recovery to occur.
2933                  */
2934                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2935                                 cmd->logout_cid);
2936                 if (logout_conn) {
2937                         iscsit_connection_reinstatement_rcfr(logout_conn);
2938                         iscsit_dec_conn_usage_count(logout_conn);
2939                 }
2940
2941                 cr = iscsit_get_inactive_connection_recovery_entry(
2942                                 conn->sess, cmd->logout_cid);
2943                 if (!cr) {
2944                         pr_err("Unable to locate CID: %hu for"
2945                         " REMOVECONNFORRECOVERY Logout Request.\n",
2946                                 cmd->logout_cid);
2947                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2948                         break;
2949                 }
2950
2951                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2952
2953                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2954                         " for recovery for CID: %hu on CID: %hu successful.\n",
2955                                 cmd->logout_cid, conn->cid);
2956                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2957                 break;
2958         default:
2959                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2960                                 cmd->logout_reason);
2961                 return -1;
2962         }
2963
2964         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2965         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2966         hdr->response           = cmd->logout_response;
2967         hdr->itt                = cmd->init_task_tag;
2968         cmd->stat_sn            = conn->stat_sn++;
2969         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2970
2971         iscsit_increment_maxcmdsn(cmd, conn->sess);
2972         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2973         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2974
2975         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2976                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2977                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2978                 cmd->logout_cid, conn->cid);
2979
2980         return 0;
2981 }
2982 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2983
2984 static int
2985 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2986 {
2987         int rc;
2988
2989         rc = iscsit_build_logout_rsp(cmd, conn,
2990                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2991         if (rc < 0)
2992                 return rc;
2993
2994         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2995 }
2996
2997 void
2998 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2999                        struct iscsi_nopin *hdr, bool nopout_response)
3000 {
3001         hdr->opcode             = ISCSI_OP_NOOP_IN;
3002         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3003         hton24(hdr->dlength, cmd->buf_ptr_size);
3004         if (nopout_response)
3005                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3006         hdr->itt                = cmd->init_task_tag;
3007         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3008         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3009                                   conn->stat_sn;
3010         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3011
3012         if (nopout_response)
3013                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3014
3015         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3016         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3017
3018         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3019                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3020                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3021                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3022 }
3023 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3024
3025 /*
3026  *      Unsolicited NOPIN, either requesting a response or not.
3027  */
3028 static int iscsit_send_unsolicited_nopin(
3029         struct iscsi_cmd *cmd,
3030         struct iscsi_conn *conn,
3031         int want_response)
3032 {
3033         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3034         int ret;
3035
3036         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3037
3038         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3039                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3040
3041         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3042         if (ret < 0)
3043                 return ret;
3044
3045         spin_lock_bh(&cmd->istate_lock);
3046         cmd->i_state = want_response ?
3047                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3048         spin_unlock_bh(&cmd->istate_lock);
3049
3050         return 0;
3051 }
3052
3053 static int
3054 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3055 {
3056         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3057
3058         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3059
3060         /*
3061          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3062          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3063          */
3064         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3065
3066         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3067                                                      cmd->buf_ptr,
3068                                                      cmd->buf_ptr_size);
3069 }
3070
3071 static int iscsit_send_r2t(
3072         struct iscsi_cmd *cmd,
3073         struct iscsi_conn *conn)
3074 {
3075         struct iscsi_r2t *r2t;
3076         struct iscsi_r2t_rsp *hdr;
3077         int ret;
3078
3079         r2t = iscsit_get_r2t_from_list(cmd);
3080         if (!r2t)
3081                 return -1;
3082
3083         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3084         memset(hdr, 0, ISCSI_HDR_LEN);
3085         hdr->opcode             = ISCSI_OP_R2T;
3086         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3087         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3088                         (struct scsi_lun *)&hdr->lun);
3089         hdr->itt                = cmd->init_task_tag;
3090         if (conn->conn_transport->iscsit_get_r2t_ttt)
3091                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3092         else
3093                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3094         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3095         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3096         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3097         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3098         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3099         hdr->data_offset        = cpu_to_be32(r2t->offset);
3100         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3101
3102         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3103                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3104                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3105                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3106                         r2t->offset, r2t->xfer_len, conn->cid);
3107
3108         spin_lock_bh(&cmd->r2t_lock);
3109         r2t->sent_r2t = 1;
3110         spin_unlock_bh(&cmd->r2t_lock);
3111
3112         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3113         if (ret < 0) {
3114                 return ret;
3115         }
3116
3117         spin_lock_bh(&cmd->dataout_timeout_lock);
3118         iscsit_start_dataout_timer(cmd, conn);
3119         spin_unlock_bh(&cmd->dataout_timeout_lock);
3120
3121         return 0;
3122 }
3123
3124 /*
3125  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3126  *              connection recovery.
3127  */
3128 int iscsit_build_r2ts_for_cmd(
3129         struct iscsi_conn *conn,
3130         struct iscsi_cmd *cmd,
3131         bool recovery)
3132 {
3133         int first_r2t = 1;
3134         u32 offset = 0, xfer_len = 0;
3135
3136         spin_lock_bh(&cmd->r2t_lock);
3137         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3138                 spin_unlock_bh(&cmd->r2t_lock);
3139                 return 0;
3140         }
3141
3142         if (conn->sess->sess_ops->DataSequenceInOrder &&
3143             !recovery)
3144                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3145
3146         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3147                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3148                         offset = cmd->r2t_offset;
3149
3150                         if (first_r2t && recovery) {
3151                                 int new_data_end = offset +
3152                                         conn->sess->sess_ops->MaxBurstLength -
3153                                         cmd->next_burst_len;
3154
3155                                 if (new_data_end > cmd->se_cmd.data_length)
3156                                         xfer_len = cmd->se_cmd.data_length - offset;
3157                                 else
3158                                         xfer_len =
3159                                                 conn->sess->sess_ops->MaxBurstLength -
3160                                                 cmd->next_burst_len;
3161                         } else {
3162                                 int new_data_end = offset +
3163                                         conn->sess->sess_ops->MaxBurstLength;
3164
3165                                 if (new_data_end > cmd->se_cmd.data_length)
3166                                         xfer_len = cmd->se_cmd.data_length - offset;
3167                                 else
3168                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3169                         }
3170
3171                         if ((s32)xfer_len < 0) {
3172                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3173                                 break;
3174                         }
3175
3176                         cmd->r2t_offset += xfer_len;
3177
3178                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3179                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3180                 } else {
3181                         struct iscsi_seq *seq;
3182
3183                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3184                         if (!seq) {
3185                                 spin_unlock_bh(&cmd->r2t_lock);
3186                                 return -1;
3187                         }
3188
3189                         offset = seq->offset;
3190                         xfer_len = seq->xfer_len;
3191
3192                         if (cmd->seq_send_order == cmd->seq_count)
3193                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3194                 }
3195                 cmd->outstanding_r2ts++;
3196                 first_r2t = 0;
3197
3198                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3199                         spin_unlock_bh(&cmd->r2t_lock);
3200                         return -1;
3201                 }
3202
3203                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3204                         break;
3205         }
3206         spin_unlock_bh(&cmd->r2t_lock);
3207
3208         return 0;
3209 }
3210 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3211
3212 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3213                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3214 {
3215         if (inc_stat_sn)
3216                 cmd->stat_sn = conn->stat_sn++;
3217
3218         atomic_long_inc(&conn->sess->rsp_pdus);
3219
3220         memset(hdr, 0, ISCSI_HDR_LEN);
3221         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3222         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3223         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3224                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3225                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3226         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3227                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3228                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3229         }
3230         hdr->response           = cmd->iscsi_response;
3231         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3232         hdr->itt                = cmd->init_task_tag;
3233         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3234
3235         iscsit_increment_maxcmdsn(cmd, conn->sess);
3236         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3237         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3238
3239         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3240                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3241                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3242                 cmd->se_cmd.scsi_status, conn->cid);
3243 }
3244 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3245
3246 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3247 {
3248         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3249         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3250         void *data_buf = NULL;
3251         u32 padding = 0, data_buf_len = 0;
3252
3253         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3254
3255         /*
3256          * Attach SENSE DATA payload to iSCSI Response PDU
3257          */
3258         if (cmd->se_cmd.sense_buffer &&
3259            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3260             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3261                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3262                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3263
3264                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3265                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3266                 data_buf = cmd->sense_buffer;
3267                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3268
3269                 if (padding) {
3270                         memset(cmd->sense_buffer +
3271                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3272                         pr_debug("Adding %u bytes of padding to"
3273                                 " SENSE.\n", padding);
3274                 }
3275
3276                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3277                                 " Response PDU\n",
3278                                 cmd->se_cmd.scsi_sense_length);
3279         }
3280
3281         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3282                                                      data_buf_len);
3283 }
3284
3285 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3286 {
3287         switch (se_tmr->response) {
3288         case TMR_FUNCTION_COMPLETE:
3289                 return ISCSI_TMF_RSP_COMPLETE;
3290         case TMR_TASK_DOES_NOT_EXIST:
3291                 return ISCSI_TMF_RSP_NO_TASK;
3292         case TMR_LUN_DOES_NOT_EXIST:
3293                 return ISCSI_TMF_RSP_NO_LUN;
3294         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3295                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3296         case TMR_FUNCTION_REJECTED:
3297         default:
3298                 return ISCSI_TMF_RSP_REJECTED;
3299         }
3300 }
3301
3302 void
3303 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3304                           struct iscsi_tm_rsp *hdr)
3305 {
3306         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3307
3308         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3309         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3310         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3311         hdr->itt                = cmd->init_task_tag;
3312         cmd->stat_sn            = conn->stat_sn++;
3313         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3314
3315         iscsit_increment_maxcmdsn(cmd, conn->sess);
3316         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3317         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3318
3319         pr_debug("Built Task Management Response ITT: 0x%08x,"
3320                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3321                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3322 }
3323 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3324
3325 static int
3326 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3327 {
3328         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3329
3330         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3331
3332         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3333 }
3334
3335 #define SENDTARGETS_BUF_LIMIT 32768U
3336
3337 static int
3338 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3339                                   enum iscsit_transport_type network_transport,
3340                                   int skip_bytes, bool *completed)
3341 {
3342         char *payload = NULL;
3343         struct iscsi_conn *conn = cmd->conn;
3344         struct iscsi_portal_group *tpg;
3345         struct iscsi_tiqn *tiqn;
3346         struct iscsi_tpg_np *tpg_np;
3347         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3348         int target_name_printed;
3349         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3350         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3351         bool active;
3352
3353         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3354                          SENDTARGETS_BUF_LIMIT);
3355
3356         payload = kzalloc(buffer_len, GFP_KERNEL);
3357         if (!payload)
3358                 return -ENOMEM;
3359
3360         /*
3361          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3362          * explicit case..
3363          */
3364         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3365                 text_ptr = strchr(text_in, '=');
3366                 if (!text_ptr) {
3367                         pr_err("Unable to locate '=' string in text_in:"
3368                                " %s\n", text_in);
3369                         kfree(payload);
3370                         return -EINVAL;
3371                 }
3372                 /*
3373                  * Skip over '=' character..
3374                  */
3375                 text_ptr += 1;
3376         }
3377
3378         spin_lock(&tiqn_lock);
3379         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3380                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3381                      strcmp(tiqn->tiqn, text_ptr)) {
3382                         continue;
3383                 }
3384
3385                 target_name_printed = 0;
3386
3387                 spin_lock(&tiqn->tiqn_tpg_lock);
3388                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3389
3390                         /* If demo_mode_discovery=0 and generate_node_acls=0
3391                          * (demo mode dislabed) do not return
3392                          * TargetName+TargetAddress unless a NodeACL exists.
3393                          */
3394
3395                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3396                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3397                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3398                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3399                                 continue;
3400                         }
3401
3402                         spin_lock(&tpg->tpg_state_lock);
3403                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3404                         spin_unlock(&tpg->tpg_state_lock);
3405
3406                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3407                                 continue;
3408
3409                         spin_lock(&tpg->tpg_np_lock);
3410                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3411                                                 tpg_np_list) {
3412                                 struct iscsi_np *np = tpg_np->tpg_np;
3413                                 struct sockaddr_storage *sockaddr;
3414
3415                                 if (np->np_network_transport != network_transport)
3416                                         continue;
3417
3418                                 if (!target_name_printed) {
3419                                         len = sprintf(buf, "TargetName=%s",
3420                                                       tiqn->tiqn);
3421                                         len += 1;
3422
3423                                         if ((len + payload_len) > buffer_len) {
3424                                                 spin_unlock(&tpg->tpg_np_lock);
3425                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3426                                                 end_of_buf = 1;
3427                                                 goto eob;
3428                                         }
3429
3430                                         if (skip_bytes && len <= skip_bytes) {
3431                                                 skip_bytes -= len;
3432                                         } else {
3433                                                 memcpy(payload + payload_len, buf, len);
3434                                                 payload_len += len;
3435                                                 target_name_printed = 1;
3436                                                 if (len > skip_bytes)
3437                                                         skip_bytes = 0;
3438                                         }
3439                                 }
3440
3441                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3442                                         sockaddr = &conn->local_sockaddr;
3443                                 else
3444                                         sockaddr = &np->np_sockaddr;
3445
3446                                 len = sprintf(buf, "TargetAddress="
3447                                               "%pISpc,%hu",
3448                                               sockaddr,
3449                                               tpg->tpgt);
3450                                 len += 1;
3451
3452                                 if ((len + payload_len) > buffer_len) {
3453                                         spin_unlock(&tpg->tpg_np_lock);
3454                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3455                                         end_of_buf = 1;
3456                                         goto eob;
3457                                 }
3458
3459                                 if (skip_bytes && len <= skip_bytes) {
3460                                         skip_bytes -= len;
3461                                 } else {
3462                                         memcpy(payload + payload_len, buf, len);
3463                                         payload_len += len;
3464                                         if (len > skip_bytes)
3465                                                 skip_bytes = 0;
3466                                 }
3467                         }
3468                         spin_unlock(&tpg->tpg_np_lock);
3469                 }
3470                 spin_unlock(&tiqn->tiqn_tpg_lock);
3471 eob:
3472                 if (end_of_buf) {
3473                         *completed = false;
3474                         break;
3475                 }
3476
3477                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3478                         break;
3479         }
3480         spin_unlock(&tiqn_lock);
3481
3482         cmd->buf_ptr = payload;
3483
3484         return payload_len;
3485 }
3486
3487 int
3488 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3489                       struct iscsi_text_rsp *hdr,
3490                       enum iscsit_transport_type network_transport)
3491 {
3492         int text_length, padding;
3493         bool completed = true;
3494
3495         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3496                                                         cmd->read_data_done,
3497                                                         &completed);
3498         if (text_length < 0)
3499                 return text_length;
3500
3501         if (completed) {
3502                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3503         } else {
3504                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3505                 cmd->read_data_done += text_length;
3506                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3507                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3508         }
3509         hdr->opcode = ISCSI_OP_TEXT_RSP;
3510         padding = ((-text_length) & 3);
3511         hton24(hdr->dlength, text_length);
3512         hdr->itt = cmd->init_task_tag;
3513         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3514         cmd->stat_sn = conn->stat_sn++;
3515         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3516
3517         iscsit_increment_maxcmdsn(cmd, conn->sess);
3518         /*
3519          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3520          * correctly increment MaxCmdSN for each response answering a
3521          * non immediate text request with a valid CmdSN.
3522          */
3523         cmd->maxcmdsn_inc = 0;
3524         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3525         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3526
3527         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3528                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3529                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3530                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3531                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3532
3533         return text_length + padding;
3534 }
3535 EXPORT_SYMBOL(iscsit_build_text_rsp);
3536
3537 static int iscsit_send_text_rsp(
3538         struct iscsi_cmd *cmd,
3539         struct iscsi_conn *conn)
3540 {
3541         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3542         int text_length;
3543
3544         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3545                                 conn->conn_transport->transport_type);
3546         if (text_length < 0)
3547                 return text_length;
3548
3549         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3550                                                      cmd->buf_ptr,
3551                                                      text_length);
3552 }
3553
3554 void
3555 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3556                     struct iscsi_reject *hdr)
3557 {
3558         hdr->opcode             = ISCSI_OP_REJECT;
3559         hdr->reason             = cmd->reject_reason;
3560         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3561         hton24(hdr->dlength, ISCSI_HDR_LEN);
3562         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3563         cmd->stat_sn            = conn->stat_sn++;
3564         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3565         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3566         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3567
3568 }
3569 EXPORT_SYMBOL(iscsit_build_reject);
3570
3571 static int iscsit_send_reject(
3572         struct iscsi_cmd *cmd,
3573         struct iscsi_conn *conn)
3574 {
3575         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3576
3577         iscsit_build_reject(cmd, conn, hdr);
3578
3579         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3580                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3581
3582         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3583                                                      cmd->buf_ptr,
3584                                                      ISCSI_HDR_LEN);
3585 }
3586
3587 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3588 {
3589         int ord, cpu;
3590         /*
3591          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3592          * within iscsit_start_kthreads()
3593          *
3594          * Here we use bitmap_id to determine which CPU that this
3595          * iSCSI connection's RX/TX threads will be scheduled to
3596          * execute upon.
3597          */
3598         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3599         for_each_online_cpu(cpu) {
3600                 if (ord-- == 0) {
3601                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3602                         return;
3603                 }
3604         }
3605         /*
3606          * This should never be reached..
3607          */
3608         dump_stack();
3609         cpumask_setall(conn->conn_cpumask);
3610 }
3611
3612 int
3613 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3614 {
3615         int ret;
3616
3617         switch (state) {
3618         case ISTATE_SEND_R2T:
3619                 ret = iscsit_send_r2t(cmd, conn);
3620                 if (ret < 0)
3621                         goto err;
3622                 break;
3623         case ISTATE_REMOVE:
3624                 spin_lock_bh(&conn->cmd_lock);
3625                 list_del_init(&cmd->i_conn_node);
3626                 spin_unlock_bh(&conn->cmd_lock);
3627
3628                 iscsit_free_cmd(cmd, false);
3629                 break;
3630         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3631                 iscsit_mod_nopin_response_timer(conn);
3632                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3633                 if (ret < 0)
3634                         goto err;
3635                 break;
3636         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3637                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3638                 if (ret < 0)
3639                         goto err;
3640                 break;
3641         default:
3642                 pr_err("Unknown Opcode: 0x%02x ITT:"
3643                        " 0x%08x, i_state: %d on CID: %hu\n",
3644                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3645                        conn->cid);
3646                 goto err;
3647         }
3648
3649         return 0;
3650
3651 err:
3652         return -1;
3653 }
3654 EXPORT_SYMBOL(iscsit_immediate_queue);
3655
3656 static int
3657 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3658 {
3659         struct iscsit_transport *t = conn->conn_transport;
3660         struct iscsi_queue_req *qr;
3661         struct iscsi_cmd *cmd;
3662         u8 state;
3663         int ret;
3664
3665         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3666                 atomic_set(&conn->check_immediate_queue, 0);
3667                 cmd = qr->cmd;
3668                 state = qr->state;
3669                 kmem_cache_free(lio_qr_cache, qr);
3670
3671                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3672                 if (ret < 0)
3673                         return ret;
3674         }
3675
3676         return 0;
3677 }
3678
3679 int
3680 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3681 {
3682         int ret;
3683
3684 check_rsp_state:
3685         switch (state) {
3686         case ISTATE_SEND_DATAIN:
3687                 ret = iscsit_send_datain(cmd, conn);
3688                 if (ret < 0)
3689                         goto err;
3690                 else if (!ret)
3691                         /* more drs */
3692                         goto check_rsp_state;
3693                 else if (ret == 1) {
3694                         /* all done */
3695                         spin_lock_bh(&cmd->istate_lock);
3696                         cmd->i_state = ISTATE_SENT_STATUS;
3697                         spin_unlock_bh(&cmd->istate_lock);
3698
3699                         if (atomic_read(&conn->check_immediate_queue))
3700                                 return 1;
3701
3702                         return 0;
3703                 } else if (ret == 2) {
3704                         /* Still must send status,
3705                            SCF_TRANSPORT_TASK_SENSE was set */
3706                         spin_lock_bh(&cmd->istate_lock);
3707                         cmd->i_state = ISTATE_SEND_STATUS;
3708                         spin_unlock_bh(&cmd->istate_lock);
3709                         state = ISTATE_SEND_STATUS;
3710                         goto check_rsp_state;
3711                 }
3712
3713                 break;
3714         case ISTATE_SEND_STATUS:
3715         case ISTATE_SEND_STATUS_RECOVERY:
3716                 ret = iscsit_send_response(cmd, conn);
3717                 break;
3718         case ISTATE_SEND_LOGOUTRSP:
3719                 ret = iscsit_send_logout(cmd, conn);
3720                 break;
3721         case ISTATE_SEND_ASYNCMSG:
3722                 ret = iscsit_send_conn_drop_async_message(
3723                         cmd, conn);
3724                 break;
3725         case ISTATE_SEND_NOPIN:
3726                 ret = iscsit_send_nopin(cmd, conn);
3727                 break;
3728         case ISTATE_SEND_REJECT:
3729                 ret = iscsit_send_reject(cmd, conn);
3730                 break;
3731         case ISTATE_SEND_TASKMGTRSP:
3732                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3733                 if (ret != 0)
3734                         break;
3735                 ret = iscsit_tmr_post_handler(cmd, conn);
3736                 if (ret != 0)
3737                         iscsit_fall_back_to_erl0(conn->sess);
3738                 break;
3739         case ISTATE_SEND_TEXTRSP:
3740                 ret = iscsit_send_text_rsp(cmd, conn);
3741                 break;
3742         default:
3743                 pr_err("Unknown Opcode: 0x%02x ITT:"
3744                        " 0x%08x, i_state: %d on CID: %hu\n",
3745                        cmd->iscsi_opcode, cmd->init_task_tag,
3746                        state, conn->cid);
3747                 goto err;
3748         }
3749         if (ret < 0)
3750                 goto err;
3751
3752         switch (state) {
3753         case ISTATE_SEND_LOGOUTRSP:
3754                 if (!iscsit_logout_post_handler(cmd, conn))
3755                         return -ECONNRESET;
3756                 fallthrough;
3757         case ISTATE_SEND_STATUS:
3758         case ISTATE_SEND_ASYNCMSG:
3759         case ISTATE_SEND_NOPIN:
3760         case ISTATE_SEND_STATUS_RECOVERY:
3761         case ISTATE_SEND_TEXTRSP:
3762         case ISTATE_SEND_TASKMGTRSP:
3763         case ISTATE_SEND_REJECT:
3764                 spin_lock_bh(&cmd->istate_lock);
3765                 cmd->i_state = ISTATE_SENT_STATUS;
3766                 spin_unlock_bh(&cmd->istate_lock);
3767                 break;
3768         default:
3769                 pr_err("Unknown Opcode: 0x%02x ITT:"
3770                        " 0x%08x, i_state: %d on CID: %hu\n",
3771                        cmd->iscsi_opcode, cmd->init_task_tag,
3772                        cmd->i_state, conn->cid);
3773                 goto err;
3774         }
3775
3776         if (atomic_read(&conn->check_immediate_queue))
3777                 return 1;
3778
3779         return 0;
3780
3781 err:
3782         return -1;
3783 }
3784 EXPORT_SYMBOL(iscsit_response_queue);
3785
3786 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3787 {
3788         struct iscsit_transport *t = conn->conn_transport;
3789         struct iscsi_queue_req *qr;
3790         struct iscsi_cmd *cmd;
3791         u8 state;
3792         int ret;
3793
3794         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3795                 cmd = qr->cmd;
3796                 state = qr->state;
3797                 kmem_cache_free(lio_qr_cache, qr);
3798
3799                 ret = t->iscsit_response_queue(conn, cmd, state);
3800                 if (ret == 1 || ret < 0)
3801                         return ret;
3802         }
3803
3804         return 0;
3805 }
3806
3807 int iscsi_target_tx_thread(void *arg)
3808 {
3809         int ret = 0;
3810         struct iscsi_conn *conn = arg;
3811         bool conn_freed = false;
3812
3813         /*
3814          * Allow ourselves to be interrupted by SIGINT so that a
3815          * connection recovery / failure event can be triggered externally.
3816          */
3817         allow_signal(SIGINT);
3818
3819         while (!kthread_should_stop()) {
3820                 /*
3821                  * Ensure that both TX and RX per connection kthreads
3822                  * are scheduled to run on the same CPU.
3823                  */
3824                 iscsit_thread_check_cpumask(conn, current, 1);
3825
3826                 wait_event_interruptible(conn->queues_wq,
3827                                          !iscsit_conn_all_queues_empty(conn));
3828
3829                 if (signal_pending(current))
3830                         goto transport_err;
3831
3832 get_immediate:
3833                 ret = iscsit_handle_immediate_queue(conn);
3834                 if (ret < 0)
3835                         goto transport_err;
3836
3837                 ret = iscsit_handle_response_queue(conn);
3838                 if (ret == 1) {
3839                         goto get_immediate;
3840                 } else if (ret == -ECONNRESET) {
3841                         conn_freed = true;
3842                         goto out;
3843                 } else if (ret < 0) {
3844                         goto transport_err;
3845                 }
3846         }
3847
3848 transport_err:
3849         /*
3850          * Avoid the normal connection failure code-path if this connection
3851          * is still within LOGIN mode, and iscsi_np process context is
3852          * responsible for cleaning up the early connection failure.
3853          */
3854         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3855                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3856 out:
3857         if (!conn_freed) {
3858                 while (!kthread_should_stop()) {
3859                         msleep(100);
3860                 }
3861         }
3862         return 0;
3863 }
3864
3865 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3866 {
3867         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3868         struct iscsi_cmd *cmd;
3869         int ret = 0;
3870
3871         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3872         case ISCSI_OP_SCSI_CMD:
3873                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874                 if (!cmd)
3875                         goto reject;
3876
3877                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3878                 break;
3879         case ISCSI_OP_SCSI_DATA_OUT:
3880                 ret = iscsit_handle_data_out(conn, buf);
3881                 break;
3882         case ISCSI_OP_NOOP_OUT:
3883                 cmd = NULL;
3884                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3885                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886                         if (!cmd)
3887                                 goto reject;
3888                 }
3889                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3890                 break;
3891         case ISCSI_OP_SCSI_TMFUNC:
3892                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3893                 if (!cmd)
3894                         goto reject;
3895
3896                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3897                 break;
3898         case ISCSI_OP_TEXT:
3899                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3900                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3901                         if (!cmd)
3902                                 goto reject;
3903                 } else {
3904                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3905                         if (!cmd)
3906                                 goto reject;
3907                 }
3908
3909                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3910                 break;
3911         case ISCSI_OP_LOGOUT:
3912                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3913                 if (!cmd)
3914                         goto reject;
3915
3916                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3917                 if (ret > 0)
3918                         wait_for_completion_timeout(&conn->conn_logout_comp,
3919                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3920                 break;
3921         case ISCSI_OP_SNACK:
3922                 ret = iscsit_handle_snack(conn, buf);
3923                 break;
3924         default:
3925                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3926                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3927                         pr_err("Cannot recover from unknown"
3928                         " opcode while ERL=0, closing iSCSI connection.\n");
3929                         return -1;
3930                 }
3931                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3932                        " closing iSCSI connection.\n");
3933                 ret = -1;
3934                 break;
3935         }
3936
3937         return ret;
3938 reject:
3939         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3940 }
3941
3942 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3943 {
3944         bool ret;
3945
3946         spin_lock_bh(&conn->state_lock);
3947         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3948         spin_unlock_bh(&conn->state_lock);
3949
3950         return ret;
3951 }
3952
3953 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3954 {
3955         int ret;
3956         u8 *buffer, opcode;
3957         u32 checksum = 0, digest = 0;
3958         struct kvec iov;
3959
3960         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3961         if (!buffer)
3962                 return;
3963
3964         while (!kthread_should_stop()) {
3965                 /*
3966                  * Ensure that both TX and RX per connection kthreads
3967                  * are scheduled to run on the same CPU.
3968                  */
3969                 iscsit_thread_check_cpumask(conn, current, 0);
3970
3971                 memset(&iov, 0, sizeof(struct kvec));
3972
3973                 iov.iov_base    = buffer;
3974                 iov.iov_len     = ISCSI_HDR_LEN;
3975
3976                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3977                 if (ret != ISCSI_HDR_LEN) {
3978                         iscsit_rx_thread_wait_for_tcp(conn);
3979                         break;
3980                 }
3981
3982                 if (conn->conn_ops->HeaderDigest) {
3983                         iov.iov_base    = &digest;
3984                         iov.iov_len     = ISCSI_CRC_LEN;
3985
3986                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3987                         if (ret != ISCSI_CRC_LEN) {
3988                                 iscsit_rx_thread_wait_for_tcp(conn);
3989                                 break;
3990                         }
3991
3992                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3993                                                   ISCSI_HDR_LEN, 0, NULL,
3994                                                   &checksum);
3995
3996                         if (digest != checksum) {
3997                                 pr_err("HeaderDigest CRC32C failed,"
3998                                         " received 0x%08x, computed 0x%08x\n",
3999                                         digest, checksum);
4000                                 /*
4001                                  * Set the PDU to 0xff so it will intentionally
4002                                  * hit default in the switch below.
4003                                  */
4004                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4005                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4006                         } else {
4007                                 pr_debug("Got HeaderDigest CRC32C"
4008                                                 " 0x%08x\n", checksum);
4009                         }
4010                 }
4011
4012                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4013                         break;
4014
4015                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4016
4017                 if (conn->sess->sess_ops->SessionType &&
4018                    ((!(opcode & ISCSI_OP_TEXT)) ||
4019                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4020                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4021                         " while in Discovery Session, rejecting.\n", opcode);
4022                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4023                                           buffer);
4024                         break;
4025                 }
4026
4027                 ret = iscsi_target_rx_opcode(conn, buffer);
4028                 if (ret < 0)
4029                         break;
4030         }
4031
4032         kfree(buffer);
4033 }
4034
4035 int iscsi_target_rx_thread(void *arg)
4036 {
4037         int rc;
4038         struct iscsi_conn *conn = arg;
4039         bool conn_freed = false;
4040
4041         /*
4042          * Allow ourselves to be interrupted by SIGINT so that a
4043          * connection recovery / failure event can be triggered externally.
4044          */
4045         allow_signal(SIGINT);
4046         /*
4047          * Wait for iscsi_post_login_handler() to complete before allowing
4048          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4049          */
4050         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4051         if (rc < 0 || iscsi_target_check_conn_state(conn))
4052                 goto out;
4053
4054         if (!conn->conn_transport->iscsit_get_rx_pdu)
4055                 return 0;
4056
4057         conn->conn_transport->iscsit_get_rx_pdu(conn);
4058
4059         if (!signal_pending(current))
4060                 atomic_set(&conn->transport_failed, 1);
4061         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4062
4063 out:
4064         if (!conn_freed) {
4065                 while (!kthread_should_stop()) {
4066                         msleep(100);
4067                 }
4068         }
4069
4070         return 0;
4071 }
4072
4073 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4074 {
4075         LIST_HEAD(tmp_list);
4076         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4077         struct iscsi_session *sess = conn->sess;
4078         /*
4079          * We expect this function to only ever be called from either RX or TX
4080          * thread context via iscsit_close_connection() once the other context
4081          * has been reset -> returned sleeping pre-handler state.
4082          */
4083         spin_lock_bh(&conn->cmd_lock);
4084         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4085
4086         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4087                 struct se_cmd *se_cmd = &cmd->se_cmd;
4088
4089                 if (se_cmd->se_tfo != NULL) {
4090                         spin_lock_irq(&se_cmd->t_state_lock);
4091                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4092                                 /*
4093                                  * LIO's abort path owns the cleanup for this,
4094                                  * so put it back on the list and let
4095                                  * aborted_task handle it.
4096                                  */
4097                                 list_move_tail(&cmd->i_conn_node,
4098                                                &conn->conn_cmd_list);
4099                         } else {
4100                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4101                         }
4102                         spin_unlock_irq(&se_cmd->t_state_lock);
4103                 }
4104         }
4105         spin_unlock_bh(&conn->cmd_lock);
4106
4107         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4108                 list_del_init(&cmd->i_conn_node);
4109
4110                 iscsit_increment_maxcmdsn(cmd, sess);
4111                 iscsit_free_cmd(cmd, true);
4112
4113         }
4114 }
4115
4116 static void iscsit_stop_timers_for_cmds(
4117         struct iscsi_conn *conn)
4118 {
4119         struct iscsi_cmd *cmd;
4120
4121         spin_lock_bh(&conn->cmd_lock);
4122         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4123                 if (cmd->data_direction == DMA_TO_DEVICE)
4124                         iscsit_stop_dataout_timer(cmd);
4125         }
4126         spin_unlock_bh(&conn->cmd_lock);
4127 }
4128
4129 int iscsit_close_connection(
4130         struct iscsi_conn *conn)
4131 {
4132         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4133         struct iscsi_session    *sess = conn->sess;
4134
4135         pr_debug("Closing iSCSI connection CID %hu on SID:"
4136                 " %u\n", conn->cid, sess->sid);
4137         /*
4138          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4139          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4140          * sleeping and the logout response never got sent because the
4141          * connection failed.
4142          *
4143          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4144          * to signal logout response TX interrupt completion.  Go ahead and skip
4145          * this for iser since isert_rx_opcode() does not wait on logout failure,
4146          * and to avoid iscsi_conn pointer dereference in iser-target code.
4147          */
4148         if (!conn->conn_transport->rdma_shutdown)
4149                 complete(&conn->conn_logout_comp);
4150
4151         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4152                 if (conn->tx_thread &&
4153                     cmpxchg(&conn->tx_thread_active, true, false)) {
4154                         send_sig(SIGINT, conn->tx_thread, 1);
4155                         kthread_stop(conn->tx_thread);
4156                 }
4157         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4158                 if (conn->rx_thread &&
4159                     cmpxchg(&conn->rx_thread_active, true, false)) {
4160                         send_sig(SIGINT, conn->rx_thread, 1);
4161                         kthread_stop(conn->rx_thread);
4162                 }
4163         }
4164
4165         spin_lock(&iscsit_global->ts_bitmap_lock);
4166         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4167                               get_order(1));
4168         spin_unlock(&iscsit_global->ts_bitmap_lock);
4169
4170         iscsit_stop_timers_for_cmds(conn);
4171         iscsit_stop_nopin_response_timer(conn);
4172         iscsit_stop_nopin_timer(conn);
4173
4174         if (conn->conn_transport->iscsit_wait_conn)
4175                 conn->conn_transport->iscsit_wait_conn(conn);
4176
4177         /*
4178          * During Connection recovery drop unacknowledged out of order
4179          * commands for this connection, and prepare the other commands
4180          * for reallegiance.
4181          *
4182          * During normal operation clear the out of order commands (but
4183          * do not free the struct iscsi_ooo_cmdsn's) and release all
4184          * struct iscsi_cmds.
4185          */
4186         if (atomic_read(&conn->connection_recovery)) {
4187                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4188                 iscsit_prepare_cmds_for_reallegiance(conn);
4189         } else {
4190                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4191                 iscsit_release_commands_from_conn(conn);
4192         }
4193         iscsit_free_queue_reqs_for_conn(conn);
4194
4195         /*
4196          * Handle decrementing session or connection usage count if
4197          * a logout response was not able to be sent because the
4198          * connection failed.  Fall back to Session Recovery here.
4199          */
4200         if (atomic_read(&conn->conn_logout_remove)) {
4201                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4202                         iscsit_dec_conn_usage_count(conn);
4203                         iscsit_dec_session_usage_count(sess);
4204                 }
4205                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4206                         iscsit_dec_conn_usage_count(conn);
4207
4208                 atomic_set(&conn->conn_logout_remove, 0);
4209                 atomic_set(&sess->session_reinstatement, 0);
4210                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4211         }
4212
4213         spin_lock_bh(&sess->conn_lock);
4214         list_del(&conn->conn_list);
4215
4216         /*
4217          * Attempt to let the Initiator know this connection failed by
4218          * sending an Connection Dropped Async Message on another
4219          * active connection.
4220          */
4221         if (atomic_read(&conn->connection_recovery))
4222                 iscsit_build_conn_drop_async_message(conn);
4223
4224         spin_unlock_bh(&sess->conn_lock);
4225
4226         /*
4227          * If connection reinstatement is being performed on this connection,
4228          * up the connection reinstatement semaphore that is being blocked on
4229          * in iscsit_cause_connection_reinstatement().
4230          */
4231         spin_lock_bh(&conn->state_lock);
4232         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4233                 spin_unlock_bh(&conn->state_lock);
4234                 complete(&conn->conn_wait_comp);
4235                 wait_for_completion(&conn->conn_post_wait_comp);
4236                 spin_lock_bh(&conn->state_lock);
4237         }
4238
4239         /*
4240          * If connection reinstatement is being performed on this connection
4241          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4242          * connection wait rcfr semaphore that is being blocked on
4243          * an iscsit_connection_reinstatement_rcfr().
4244          */
4245         if (atomic_read(&conn->connection_wait_rcfr)) {
4246                 spin_unlock_bh(&conn->state_lock);
4247                 complete(&conn->conn_wait_rcfr_comp);
4248                 wait_for_completion(&conn->conn_post_wait_comp);
4249                 spin_lock_bh(&conn->state_lock);
4250         }
4251         atomic_set(&conn->connection_reinstatement, 1);
4252         spin_unlock_bh(&conn->state_lock);
4253
4254         /*
4255          * If any other processes are accessing this connection pointer we
4256          * must wait until they have completed.
4257          */
4258         iscsit_check_conn_usage_count(conn);
4259
4260         ahash_request_free(conn->conn_tx_hash);
4261         if (conn->conn_rx_hash) {
4262                 struct crypto_ahash *tfm;
4263
4264                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4265                 ahash_request_free(conn->conn_rx_hash);
4266                 crypto_free_ahash(tfm);
4267         }
4268
4269         if (conn->sock)
4270                 sock_release(conn->sock);
4271
4272         if (conn->conn_transport->iscsit_free_conn)
4273                 conn->conn_transport->iscsit_free_conn(conn);
4274
4275         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4276         conn->conn_state = TARG_CONN_STATE_FREE;
4277         iscsit_free_conn(conn);
4278
4279         spin_lock_bh(&sess->conn_lock);
4280         atomic_dec(&sess->nconn);
4281         pr_debug("Decremented iSCSI connection count to %hu from node:"
4282                 " %s\n", atomic_read(&sess->nconn),
4283                 sess->sess_ops->InitiatorName);
4284         /*
4285          * Make sure that if one connection fails in an non ERL=2 iSCSI
4286          * Session that they all fail.
4287          */
4288         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4289              !atomic_read(&sess->session_logout))
4290                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4291
4292         /*
4293          * If this was not the last connection in the session, and we are
4294          * performing session reinstatement or falling back to ERL=0, call
4295          * iscsit_stop_session() without sleeping to shutdown the other
4296          * active connections.
4297          */
4298         if (atomic_read(&sess->nconn)) {
4299                 if (!atomic_read(&sess->session_reinstatement) &&
4300                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4301                         spin_unlock_bh(&sess->conn_lock);
4302                         return 0;
4303                 }
4304                 if (!atomic_read(&sess->session_stop_active)) {
4305                         atomic_set(&sess->session_stop_active, 1);
4306                         spin_unlock_bh(&sess->conn_lock);
4307                         iscsit_stop_session(sess, 0, 0);
4308                         return 0;
4309                 }
4310                 spin_unlock_bh(&sess->conn_lock);
4311                 return 0;
4312         }
4313
4314         /*
4315          * If this was the last connection in the session and one of the
4316          * following is occurring:
4317          *
4318          * Session Reinstatement is not being performed, and are falling back
4319          * to ERL=0 call iscsit_close_session().
4320          *
4321          * Session Logout was requested.  iscsit_close_session() will be called
4322          * elsewhere.
4323          *
4324          * Session Continuation is not being performed, start the Time2Retain
4325          * handler and check if sleep_on_sess_wait_sem is active.
4326          */
4327         if (!atomic_read(&sess->session_reinstatement) &&
4328              atomic_read(&sess->session_fall_back_to_erl0)) {
4329                 spin_unlock_bh(&sess->conn_lock);
4330                 complete_all(&sess->session_wait_comp);
4331                 iscsit_close_session(sess, true);
4332
4333                 return 0;
4334         } else if (atomic_read(&sess->session_logout)) {
4335                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4336                 sess->session_state = TARG_SESS_STATE_FREE;
4337
4338                 if (atomic_read(&sess->session_close)) {
4339                         spin_unlock_bh(&sess->conn_lock);
4340                         complete_all(&sess->session_wait_comp);
4341                         iscsit_close_session(sess, true);
4342                 } else {
4343                         spin_unlock_bh(&sess->conn_lock);
4344                 }
4345
4346                 return 0;
4347         } else {
4348                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4349                 sess->session_state = TARG_SESS_STATE_FAILED;
4350
4351                 if (!atomic_read(&sess->session_continuation))
4352                         iscsit_start_time2retain_handler(sess);
4353
4354                 if (atomic_read(&sess->session_close)) {
4355                         spin_unlock_bh(&sess->conn_lock);
4356                         complete_all(&sess->session_wait_comp);
4357                         iscsit_close_session(sess, true);
4358                 } else {
4359                         spin_unlock_bh(&sess->conn_lock);
4360                 }
4361
4362                 return 0;
4363         }
4364 }
4365
4366 /*
4367  * If the iSCSI Session for the iSCSI Initiator Node exists,
4368  * forcefully shutdown the iSCSI NEXUS.
4369  */
4370 int iscsit_close_session(struct iscsi_session *sess, bool can_sleep)
4371 {
4372         struct iscsi_portal_group *tpg = sess->tpg;
4373         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4374
4375         if (atomic_read(&sess->nconn)) {
4376                 pr_err("%d connection(s) still exist for iSCSI session"
4377                         " to %s\n", atomic_read(&sess->nconn),
4378                         sess->sess_ops->InitiatorName);
4379                 BUG();
4380         }
4381
4382         spin_lock_bh(&se_tpg->session_lock);
4383         atomic_set(&sess->session_logout, 1);
4384         atomic_set(&sess->session_reinstatement, 1);
4385         iscsit_stop_time2retain_timer(sess);
4386         spin_unlock_bh(&se_tpg->session_lock);
4387
4388         /*
4389          * transport_deregister_session_configfs() will clear the
4390          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4391          * can be setting it again with __transport_register_session() in
4392          * iscsi_post_login_handler() again after the iscsit_stop_session()
4393          * completes in iscsi_np context.
4394          */
4395         transport_deregister_session_configfs(sess->se_sess);
4396
4397         /*
4398          * If any other processes are accessing this session pointer we must
4399          * wait until they have completed.  If we are in an interrupt (the
4400          * time2retain handler) and contain and active session usage count we
4401          * restart the timer and exit.
4402          */
4403         if (iscsit_check_session_usage_count(sess, can_sleep)) {
4404                 atomic_set(&sess->session_logout, 0);
4405                 iscsit_start_time2retain_handler(sess);
4406                 return 0;
4407         }
4408
4409         transport_deregister_session(sess->se_sess);
4410
4411         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4412                 iscsit_free_connection_recovery_entries(sess);
4413
4414         iscsit_free_all_ooo_cmdsns(sess);
4415
4416         spin_lock_bh(&se_tpg->session_lock);
4417         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4418         sess->session_state = TARG_SESS_STATE_FREE;
4419         pr_debug("Released iSCSI session from node: %s\n",
4420                         sess->sess_ops->InitiatorName);
4421         tpg->nsessions--;
4422         if (tpg->tpg_tiqn)
4423                 tpg->tpg_tiqn->tiqn_nsessions--;
4424
4425         pr_debug("Decremented number of active iSCSI Sessions on"
4426                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4427
4428         ida_free(&sess_ida, sess->session_index);
4429         kfree(sess->sess_ops);
4430         sess->sess_ops = NULL;
4431         spin_unlock_bh(&se_tpg->session_lock);
4432
4433         kfree(sess);
4434         return 0;
4435 }
4436
4437 static void iscsit_logout_post_handler_closesession(
4438         struct iscsi_conn *conn)
4439 {
4440         struct iscsi_session *sess = conn->sess;
4441         int sleep = 1;
4442         /*
4443          * Traditional iscsi/tcp will invoke this logic from TX thread
4444          * context during session logout, so clear tx_thread_active and
4445          * sleep if iscsit_close_connection() has not already occured.
4446          *
4447          * Since iser-target invokes this logic from it's own workqueue,
4448          * always sleep waiting for RX/TX thread shutdown to complete
4449          * within iscsit_close_connection().
4450          */
4451         if (!conn->conn_transport->rdma_shutdown) {
4452                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4453                 if (!sleep)
4454                         return;
4455         }
4456
4457         atomic_set(&conn->conn_logout_remove, 0);
4458         complete(&conn->conn_logout_comp);
4459
4460         iscsit_dec_conn_usage_count(conn);
4461         atomic_set(&sess->session_close, 1);
4462         iscsit_stop_session(sess, sleep, sleep);
4463         iscsit_dec_session_usage_count(sess);
4464 }
4465
4466 static void iscsit_logout_post_handler_samecid(
4467         struct iscsi_conn *conn)
4468 {
4469         int sleep = 1;
4470
4471         if (!conn->conn_transport->rdma_shutdown) {
4472                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4473                 if (!sleep)
4474                         return;
4475         }
4476
4477         atomic_set(&conn->conn_logout_remove, 0);
4478         complete(&conn->conn_logout_comp);
4479
4480         iscsit_cause_connection_reinstatement(conn, sleep);
4481         iscsit_dec_conn_usage_count(conn);
4482 }
4483
4484 static void iscsit_logout_post_handler_diffcid(
4485         struct iscsi_conn *conn,
4486         u16 cid)
4487 {
4488         struct iscsi_conn *l_conn;
4489         struct iscsi_session *sess = conn->sess;
4490         bool conn_found = false;
4491
4492         if (!sess)
4493                 return;
4494
4495         spin_lock_bh(&sess->conn_lock);
4496         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4497                 if (l_conn->cid == cid) {
4498                         iscsit_inc_conn_usage_count(l_conn);
4499                         conn_found = true;
4500                         break;
4501                 }
4502         }
4503         spin_unlock_bh(&sess->conn_lock);
4504
4505         if (!conn_found)
4506                 return;
4507
4508         if (l_conn->sock)
4509                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4510
4511         spin_lock_bh(&l_conn->state_lock);
4512         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4513         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4514         spin_unlock_bh(&l_conn->state_lock);
4515
4516         iscsit_cause_connection_reinstatement(l_conn, 1);
4517         iscsit_dec_conn_usage_count(l_conn);
4518 }
4519
4520 /*
4521  *      Return of 0 causes the TX thread to restart.
4522  */
4523 int iscsit_logout_post_handler(
4524         struct iscsi_cmd *cmd,
4525         struct iscsi_conn *conn)
4526 {
4527         int ret = 0;
4528
4529         switch (cmd->logout_reason) {
4530         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4531                 switch (cmd->logout_response) {
4532                 case ISCSI_LOGOUT_SUCCESS:
4533                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4534                 default:
4535                         iscsit_logout_post_handler_closesession(conn);
4536                         break;
4537                 }
4538                 break;
4539         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4540                 if (conn->cid == cmd->logout_cid) {
4541                         switch (cmd->logout_response) {
4542                         case ISCSI_LOGOUT_SUCCESS:
4543                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4544                         default:
4545                                 iscsit_logout_post_handler_samecid(conn);
4546                                 break;
4547                         }
4548                 } else {
4549                         switch (cmd->logout_response) {
4550                         case ISCSI_LOGOUT_SUCCESS:
4551                                 iscsit_logout_post_handler_diffcid(conn,
4552                                         cmd->logout_cid);
4553                                 break;
4554                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4555                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4556                         default:
4557                                 break;
4558                         }
4559                         ret = 1;
4560                 }
4561                 break;
4562         case ISCSI_LOGOUT_REASON_RECOVERY:
4563                 switch (cmd->logout_response) {
4564                 case ISCSI_LOGOUT_SUCCESS:
4565                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4566                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4567                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4568                 default:
4569                         break;
4570                 }
4571                 ret = 1;
4572                 break;
4573         default:
4574                 break;
4575
4576         }
4577         return ret;
4578 }
4579 EXPORT_SYMBOL(iscsit_logout_post_handler);
4580
4581 void iscsit_fail_session(struct iscsi_session *sess)
4582 {
4583         struct iscsi_conn *conn;
4584
4585         spin_lock_bh(&sess->conn_lock);
4586         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4587                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4588                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4589         }
4590         spin_unlock_bh(&sess->conn_lock);
4591
4592         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4593         sess->session_state = TARG_SESS_STATE_FAILED;
4594 }
4595
4596 void iscsit_stop_session(
4597         struct iscsi_session *sess,
4598         int session_sleep,
4599         int connection_sleep)
4600 {
4601         u16 conn_count = atomic_read(&sess->nconn);
4602         struct iscsi_conn *conn, *conn_tmp = NULL;
4603         int is_last;
4604
4605         spin_lock_bh(&sess->conn_lock);
4606
4607         if (connection_sleep) {
4608                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4609                                 conn_list) {
4610                         if (conn_count == 0)
4611                                 break;
4612
4613                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4614                                 is_last = 1;
4615                         } else {
4616                                 iscsit_inc_conn_usage_count(conn_tmp);
4617                                 is_last = 0;
4618                         }
4619                         iscsit_inc_conn_usage_count(conn);
4620
4621                         spin_unlock_bh(&sess->conn_lock);
4622                         iscsit_cause_connection_reinstatement(conn, 1);
4623                         spin_lock_bh(&sess->conn_lock);
4624
4625                         iscsit_dec_conn_usage_count(conn);
4626                         if (is_last == 0)
4627                                 iscsit_dec_conn_usage_count(conn_tmp);
4628                         conn_count--;
4629                 }
4630         } else {
4631                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4632                         iscsit_cause_connection_reinstatement(conn, 0);
4633         }
4634
4635         if (session_sleep && atomic_read(&sess->nconn)) {
4636                 spin_unlock_bh(&sess->conn_lock);
4637                 wait_for_completion(&sess->session_wait_comp);
4638         } else
4639                 spin_unlock_bh(&sess->conn_lock);
4640 }
4641
4642 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4643 {
4644         struct iscsi_session *sess;
4645         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4646         struct se_session *se_sess, *se_sess_tmp;
4647         LIST_HEAD(free_list);
4648         int session_count = 0;
4649
4650         spin_lock_bh(&se_tpg->session_lock);
4651         if (tpg->nsessions && !force) {
4652                 spin_unlock_bh(&se_tpg->session_lock);
4653                 return -1;
4654         }
4655
4656         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4657                         sess_list) {
4658                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4659
4660                 spin_lock(&sess->conn_lock);
4661                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4662                     atomic_read(&sess->session_logout) ||
4663                     atomic_read(&sess->session_close) ||
4664                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4665                         spin_unlock(&sess->conn_lock);
4666                         continue;
4667                 }
4668                 iscsit_inc_session_usage_count(sess);
4669                 atomic_set(&sess->session_reinstatement, 1);
4670                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4671                 atomic_set(&sess->session_close, 1);
4672                 spin_unlock(&sess->conn_lock);
4673
4674                 list_move_tail(&se_sess->sess_list, &free_list);
4675         }
4676         spin_unlock_bh(&se_tpg->session_lock);
4677
4678         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4679                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4680
4681                 list_del_init(&se_sess->sess_list);
4682                 iscsit_stop_session(sess, 1, 1);
4683                 iscsit_dec_session_usage_count(sess);
4684                 session_count++;
4685         }
4686
4687         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4688                         " Group: %hu\n", session_count, tpg->tpgt);
4689         return 0;
4690 }
4691
4692 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4693 MODULE_VERSION("4.1.x");
4694 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4695 MODULE_LICENSE("GPL");
4696
4697 module_init(iscsi_target_init_module);
4698 module_exit(iscsi_target_cleanup_module);