drivers/target/iscsi/iscsi_target.c

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