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