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