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 static struct iscsi_np *iscsit_get_np(
 312         struct sockaddr_storage *sockaddr,
 313         int network_transport)
 314 {
 315         struct iscsi_np *np;
 316         bool match;
 317
 318         lockdep_assert_held(&np_lock);
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct sockaddr_storage *sockaddr,
 346         int network_transport)
 347 {
 348         struct iscsi_np *np;
 349         int ret;
 350
 351         mutex_lock(&np_lock);
 352
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np) {
 358                 mutex_unlock(&np_lock);
 359                 return np;
 360         }
 361
 362         np = kzalloc(sizeof(*np), GFP_KERNEL);
 363         if (!np) {
 364                 mutex_unlock(&np_lock);
 365                 return ERR_PTR(-ENOMEM);
 366         }
 367
 368         np->np_flags |= NPF_IP_NETWORK;
 369         np->np_network_transport = network_transport;
 370         spin_lock_init(&np->np_thread_lock);
 371         init_completion(&np->np_restart_comp);
 372         INIT_LIST_HEAD(&np->np_list);
 373
 374         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 375
 376         ret = iscsi_target_setup_login_socket(np, sockaddr);
 377         if (ret != 0) {
 378                 kfree(np);
 379                 mutex_unlock(&np_lock);
 380                 return ERR_PTR(ret);
 381         }
 382
 383         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 384         if (IS_ERR(np->np_thread)) {
 385                 pr_err("Unable to create kthread: iscsi_np\n");
 386                 ret = PTR_ERR(np->np_thread);
 387                 kfree(np);
 388                 mutex_unlock(&np_lock);
 389                 return ERR_PTR(ret);
 390         }
 391         /*
 392          * Increment the np_exports reference count now to prevent
 393          * iscsit_del_np() below from being run while a new call to
 394          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 395          * active.  We don't need to hold np->np_thread_lock at this
 396          * point because iscsi_np has not been added to g_np_list yet.
 397          */
 398         np->np_exports = 1;
 399         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 400
 401         list_add_tail(&np->np_list, &g_np_list);
 402         mutex_unlock(&np_lock);
 403
 404         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 405                 &np->np_sockaddr, np->np_transport->name);
 406
 407         return np;
 408 }
 409
 410 int iscsit_reset_np_thread(
 411         struct iscsi_np *np,
 412         struct iscsi_tpg_np *tpg_np,
 413         struct iscsi_portal_group *tpg,
 414         bool shutdown)
 415 {
 416         spin_lock_bh(&np->np_thread_lock);
 417         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 418                 spin_unlock_bh(&np->np_thread_lock);
 419                 return 0;
 420         }
 421         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 422         atomic_inc(&np->np_reset_count);
 423
 424         if (np->np_thread) {
 425                 spin_unlock_bh(&np->np_thread_lock);
 426                 send_sig(SIGINT, np->np_thread, 1);
 427                 wait_for_completion(&np->np_restart_comp);
 428                 spin_lock_bh(&np->np_thread_lock);
 429         }
 430         spin_unlock_bh(&np->np_thread_lock);
 431
 432         if (tpg_np && shutdown) {
 433                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 434
 435                 wait_for_completion(&tpg_np->tpg_np_comp);
 436         }
 437
 438         return 0;
 439 }
 440
 441 static void iscsit_free_np(struct iscsi_np *np)
 442 {
 443         if (np->np_socket)
 444                 sock_release(np->np_socket);
 445 }
 446
 447 int iscsit_del_np(struct iscsi_np *np)
 448 {
 449         spin_lock_bh(&np->np_thread_lock);
 450         np->np_exports--;
 451         if (np->np_exports) {
 452                 np->enabled = true;
 453                 spin_unlock_bh(&np->np_thread_lock);
 454                 return 0;
 455         }
 456         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 457         spin_unlock_bh(&np->np_thread_lock);
 458
 459         if (np->np_thread) {
 460                 /*
 461                  * We need to send the signal to wakeup Linux/Net
 462                  * which may be sleeping in sock_accept()..
 463                  */
 464                 send_sig(SIGINT, np->np_thread, 1);
 465                 kthread_stop(np->np_thread);
 466                 np->np_thread = NULL;
 467         }
 468
 469         np->np_transport->iscsit_free_np(np);
 470
 471         mutex_lock(&np_lock);
 472         list_del(&np->np_list);
 473         mutex_unlock(&np_lock);
 474
 475         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 476                 &np->np_sockaddr, np->np_transport->name);
 477
 478         iscsit_put_transport(np->np_transport);
 479         kfree(np);
 480         return 0;
 481 }
 482
 483 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 484
 485 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 486 {
 487         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 488 }
 489 EXPORT_SYMBOL(iscsit_queue_rsp);
 490
 491 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 492 {
 493         spin_lock_bh(&conn->cmd_lock);
 494         if (!list_empty(&cmd->i_conn_node) &&
 495             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 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("Unable 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_unsolicited_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_unsolicited_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_unsolicited_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_unsolicited_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         while (data_length) {
1384                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1385
1386                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1387                 crypto_ahash_update(hash);
1388
1389                 data_length -= cur_len;
1390                 page_off = 0;
1391                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1392                 sg = sg_next(sg);
1393         }
1394
1395         if (padding) {
1396                 struct scatterlist pad_sg;
1397
1398                 sg_init_one(&pad_sg, pad_bytes, padding);
1399                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1400                                         padding);
1401                 crypto_ahash_finup(hash);
1402         } else {
1403                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1404                 crypto_ahash_final(hash);
1405         }
1406
1407         return data_crc;
1408 }
1409
1410 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1411         const void *buf, u32 payload_length, u32 padding,
1412         const void *pad_bytes, void *data_crc)
1413 {
1414         struct scatterlist sg[2];
1415
1416         sg_init_table(sg, ARRAY_SIZE(sg));
1417         sg_set_buf(sg, buf, payload_length);
1418         if (padding)
1419                 sg_set_buf(sg + 1, pad_bytes, padding);
1420
1421         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1422
1423         crypto_ahash_digest(hash);
1424 }
1425
1426 int
1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1428                            struct iscsi_cmd *cmd, u32 payload_length,
1429                            bool *success)
1430 {
1431         struct iscsi_data *hdr = buf;
1432         struct se_cmd *se_cmd;
1433         int rc;
1434
1435         /* iSCSI write */
1436         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1437
1438         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1439                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1440                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1441                 payload_length, conn->cid);
1442
1443         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1444                 pr_err("Command ITT: 0x%08x received DataOUT after"
1445                         " last DataOUT received, dumping payload\n",
1446                         cmd->init_task_tag);
1447                 return iscsit_dump_data_payload(conn, payload_length, 1);
1448         }
1449
1450         if (cmd->data_direction != DMA_TO_DEVICE) {
1451                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1452                         " NON-WRITE command.\n", cmd->init_task_tag);
1453                 return iscsit_dump_data_payload(conn, payload_length, 1);
1454         }
1455         se_cmd = &cmd->se_cmd;
1456         iscsit_mod_dataout_timer(cmd);
1457
1458         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1459                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1460                        be32_to_cpu(hdr->offset), payload_length,
1461                        cmd->se_cmd.data_length);
1462                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1463         }
1464
1465         if (cmd->unsolicited_data) {
1466                 int dump_unsolicited_data = 0;
1467
1468                 if (conn->sess->sess_ops->InitialR2T) {
1469                         pr_err("Received unexpected unsolicited data"
1470                                 " while InitialR2T=Yes, protocol error.\n");
1471                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1472                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473                         return -1;
1474                 }
1475                 /*
1476                  * Special case for dealing with Unsolicited DataOUT
1477                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478                  * failures;
1479                  */
1480
1481                 /* Something's amiss if we're not in WRITE_PENDING state... */
1482                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1483                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1484                         dump_unsolicited_data = 1;
1485
1486                 if (dump_unsolicited_data) {
1487                         /*
1488                          * Check if a delayed TASK_ABORTED status needs to
1489                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1490                          * received with the unsolicited data out.
1491                          */
1492                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1493                                 iscsit_stop_dataout_timer(cmd);
1494
1495                         return iscsit_dump_data_payload(conn, payload_length, 1);
1496                 }
1497         } else {
1498                 /*
1499                  * For the normal solicited data path:
1500                  *
1501                  * Check for a delayed TASK_ABORTED status and dump any
1502                  * incoming data out payload if one exists.  Also, when the
1503                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1504                  * data out sequence, we decrement outstanding_r2ts.  Once
1505                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1506                  * TASK_ABORTED status.
1507                  */
1508                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1509                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1510                             --cmd->outstanding_r2ts < 1)
1511                                 iscsit_stop_dataout_timer(cmd);
1512
1513                         return iscsit_dump_data_payload(conn, payload_length, 1);
1514                 }
1515         }
1516         /*
1517          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1518          * within-command recovery checks before receiving the payload.
1519          */
1520         rc = iscsit_check_pre_dataout(cmd, buf);
1521         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1522                 return 0;
1523         else if (rc == DATAOUT_CANNOT_RECOVER)
1524                 return -1;
1525         *success = true;
1526         return 0;
1527 }
1528 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1529
1530 int
1531 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1532                          struct iscsi_cmd **out_cmd)
1533 {
1534         struct iscsi_data *hdr = buf;
1535         struct iscsi_cmd *cmd;
1536         u32 payload_length = ntoh24(hdr->dlength);
1537         int rc;
1538         bool success = false;
1539
1540         if (!payload_length) {
1541                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1542                 return 0;
1543         }
1544
1545         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1546                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1547                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1548                         conn->conn_ops->MaxXmitDataSegmentLength);
1549                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1550         }
1551
1552         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1553         if (!cmd)
1554                 return 0;
1555
1556         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1557
1558         if (success)
1559                 *out_cmd = cmd;
1560
1561         return rc;
1562 }
1563 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1564
1565 static int
1566 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1567                    struct iscsi_data *hdr)
1568 {
1569         struct kvec *iov;
1570         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1571         u32 payload_length = ntoh24(hdr->dlength);
1572         int iov_ret, data_crc_failed = 0;
1573
1574         rx_size += payload_length;
1575         iov = &cmd->iov_data[0];
1576
1577         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1578                                    payload_length);
1579         if (iov_ret < 0)
1580                 return -1;
1581
1582         iov_count += iov_ret;
1583
1584         padding = ((-payload_length) & 3);
1585         if (padding != 0) {
1586                 iov[iov_count].iov_base = cmd->pad_bytes;
1587                 iov[iov_count++].iov_len = padding;
1588                 rx_size += padding;
1589                 pr_debug("Receiving %u padding bytes.\n", padding);
1590         }
1591
1592         if (conn->conn_ops->DataDigest) {
1593                 iov[iov_count].iov_base = &checksum;
1594                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1595                 rx_size += ISCSI_CRC_LEN;
1596         }
1597
1598         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1599
1600         iscsit_unmap_iovec(cmd);
1601
1602         if (rx_got != rx_size)
1603                 return -1;
1604
1605         if (conn->conn_ops->DataDigest) {
1606                 u32 data_crc;
1607
1608                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1609                                                     be32_to_cpu(hdr->offset),
1610                                                     payload_length, padding,
1611                                                     cmd->pad_bytes);
1612
1613                 if (checksum != data_crc) {
1614                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1615                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1616                                 " does not match computed 0x%08x\n",
1617                                 hdr->itt, hdr->offset, payload_length,
1618                                 hdr->datasn, checksum, data_crc);
1619                         data_crc_failed = 1;
1620                 } else {
1621                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1622                                 " %u bytes of Data Out\n", checksum,
1623                                 payload_length);
1624                 }
1625         }
1626
1627         return data_crc_failed;
1628 }
1629
1630 int
1631 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1632                              bool data_crc_failed)
1633 {
1634         struct iscsi_conn *conn = cmd->conn;
1635         int rc, ooo_cmdsn;
1636         /*
1637          * Increment post receive data and CRC values or perform
1638          * within-command recovery.
1639          */
1640         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1641         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1642                 return 0;
1643         else if (rc == DATAOUT_SEND_R2T) {
1644                 iscsit_set_dataout_sequence_values(cmd);
1645                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1646         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1647                 /*
1648                  * Handle extra special case for out of order
1649                  * Unsolicited Data Out.
1650                  */
1651                 spin_lock_bh(&cmd->istate_lock);
1652                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1653                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1654                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1655                 spin_unlock_bh(&cmd->istate_lock);
1656
1657                 iscsit_stop_dataout_timer(cmd);
1658                 if (ooo_cmdsn)
1659                         return 0;
1660                 target_execute_cmd(&cmd->se_cmd);
1661                 return 0;
1662         } else /* DATAOUT_CANNOT_RECOVER */
1663                 return -1;
1664
1665         return 0;
1666 }
1667 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1668
1669 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1670 {
1671         struct iscsi_cmd *cmd = NULL;
1672         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1673         int rc;
1674         bool data_crc_failed = false;
1675
1676         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1677         if (rc < 0)
1678                 return 0;
1679         else if (!cmd)
1680                 return 0;
1681
1682         rc = iscsit_get_dataout(conn, cmd, hdr);
1683         if (rc < 0)
1684                 return rc;
1685         else if (rc > 0)
1686                 data_crc_failed = true;
1687
1688         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1689 }
1690
1691 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1692                          struct iscsi_nopout *hdr)
1693 {
1694         u32 payload_length = ntoh24(hdr->dlength);
1695
1696         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1697                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1698                 if (!cmd)
1699                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1700                                                  (unsigned char *)hdr);
1701
1702                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1703                                          (unsigned char *)hdr);
1704         }
1705
1706         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1707                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1708                         " not set, protocol error.\n");
1709                 if (!cmd)
1710                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1711                                                  (unsigned char *)hdr);
1712
1713                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1714                                          (unsigned char *)hdr);
1715         }
1716
1717         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1718                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1719                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1720                         " error.\n", payload_length,
1721                         conn->conn_ops->MaxXmitDataSegmentLength);
1722                 if (!cmd)
1723                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1724                                                  (unsigned char *)hdr);
1725
1726                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1727                                          (unsigned char *)hdr);
1728         }
1729
1730         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1731                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1732                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1733                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1734                 payload_length);
1735         /*
1736          * This is not a response to a Unsolicited NopIN, which means
1737          * it can either be a NOPOUT ping request (with a valid ITT),
1738          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1739          * Either way, make sure we allocate an struct iscsi_cmd, as both
1740          * can contain ping data.
1741          */
1742         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1743                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1744                 cmd->i_state            = ISTATE_SEND_NOPIN;
1745                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1746                                                 1 : 0);
1747                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1748                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1749                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1750                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1751                 cmd->data_direction     = DMA_NONE;
1752         }
1753
1754         return 0;
1755 }
1756 EXPORT_SYMBOL(iscsit_setup_nop_out);
1757
1758 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1759                            struct iscsi_nopout *hdr)
1760 {
1761         struct iscsi_cmd *cmd_p = NULL;
1762         int cmdsn_ret = 0;
1763         /*
1764          * Initiator is expecting a NopIN ping reply..
1765          */
1766         if (hdr->itt != RESERVED_ITT) {
1767                 if (!cmd)
1768                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1769                                                 (unsigned char *)hdr);
1770
1771                 spin_lock_bh(&conn->cmd_lock);
1772                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1773                 spin_unlock_bh(&conn->cmd_lock);
1774
1775                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1776
1777                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1778                         iscsit_add_cmd_to_response_queue(cmd, conn,
1779                                                          cmd->i_state);
1780                         return 0;
1781                 }
1782
1783                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1784                                 (unsigned char *)hdr, hdr->cmdsn);
1785                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1786                         return 0;
1787                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1788                         return -1;
1789
1790                 return 0;
1791         }
1792         /*
1793          * This was a response to a unsolicited NOPIN ping.
1794          */
1795         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1796                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1797                 if (!cmd_p)
1798                         return -EINVAL;
1799
1800                 iscsit_stop_nopin_response_timer(conn);
1801
1802                 cmd_p->i_state = ISTATE_REMOVE;
1803                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1804
1805                 iscsit_start_nopin_timer(conn);
1806                 return 0;
1807         }
1808         /*
1809          * Otherwise, initiator is not expecting a NOPIN is response.
1810          * Just ignore for now.
1811          */
1812
1813         if (cmd)
1814                 iscsit_free_cmd(cmd, false);
1815
1816         return 0;
1817 }
1818 EXPORT_SYMBOL(iscsit_process_nop_out);
1819
1820 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1821                                  unsigned char *buf)
1822 {
1823         unsigned char *ping_data = NULL;
1824         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1825         struct kvec *iov = NULL;
1826         u32 payload_length = ntoh24(hdr->dlength);
1827         int ret;
1828
1829         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1830         if (ret < 0)
1831                 return 0;
1832         /*
1833          * Handle NOP-OUT payload for traditional iSCSI sockets
1834          */
1835         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1836                 u32 checksum, data_crc, padding = 0;
1837                 int niov = 0, rx_got, rx_size = payload_length;
1838
1839                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1840                 if (!ping_data) {
1841                         ret = -1;
1842                         goto out;
1843                 }
1844
1845                 iov = &cmd->iov_misc[0];
1846                 iov[niov].iov_base      = ping_data;
1847                 iov[niov++].iov_len     = payload_length;
1848
1849                 padding = ((-payload_length) & 3);
1850                 if (padding != 0) {
1851                         pr_debug("Receiving %u additional bytes"
1852                                 " for padding.\n", padding);
1853                         iov[niov].iov_base      = &cmd->pad_bytes;
1854                         iov[niov++].iov_len     = padding;
1855                         rx_size += padding;
1856                 }
1857                 if (conn->conn_ops->DataDigest) {
1858                         iov[niov].iov_base      = &checksum;
1859                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1860                         rx_size += ISCSI_CRC_LEN;
1861                 }
1862
1863                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1864                 if (rx_got != rx_size) {
1865                         ret = -1;
1866                         goto out;
1867                 }
1868
1869                 if (conn->conn_ops->DataDigest) {
1870                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1871                                                   payload_length, padding,
1872                                                   cmd->pad_bytes, &data_crc);
1873
1874                         if (checksum != data_crc) {
1875                                 pr_err("Ping data CRC32C DataDigest"
1876                                 " 0x%08x does not match computed 0x%08x\n",
1877                                         checksum, data_crc);
1878                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1879                                         pr_err("Unable to recover from"
1880                                         " NOPOUT Ping DataCRC failure while in"
1881                                                 " ERL=0.\n");
1882                                         ret = -1;
1883                                         goto out;
1884                                 } else {
1885                                         /*
1886                                          * Silently drop this PDU and let the
1887                                          * initiator plug the CmdSN gap.
1888                                          */
1889                                         pr_debug("Dropping NOPOUT"
1890                                         " Command CmdSN: 0x%08x due to"
1891                                         " DataCRC error.\n", hdr->cmdsn);
1892                                         ret = 0;
1893                                         goto out;
1894                                 }
1895                         } else {
1896                                 pr_debug("Got CRC32C DataDigest"
1897                                 " 0x%08x for %u bytes of ping data.\n",
1898                                         checksum, payload_length);
1899                         }
1900                 }
1901
1902                 ping_data[payload_length] = '\0';
1903                 /*
1904                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1905                  */
1906                 cmd->buf_ptr = ping_data;
1907                 cmd->buf_ptr_size = payload_length;
1908
1909                 pr_debug("Got %u bytes of NOPOUT ping"
1910                         " data.\n", payload_length);
1911                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1912         }
1913
1914         return iscsit_process_nop_out(conn, cmd, hdr);
1915 out:
1916         if (cmd)
1917                 iscsit_free_cmd(cmd, false);
1918
1919         kfree(ping_data);
1920         return ret;
1921 }
1922
1923 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1924 {
1925         switch (iscsi_tmf) {
1926         case ISCSI_TM_FUNC_ABORT_TASK:
1927                 return TMR_ABORT_TASK;
1928         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1929                 return TMR_ABORT_TASK_SET;
1930         case ISCSI_TM_FUNC_CLEAR_ACA:
1931                 return TMR_CLEAR_ACA;
1932         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1933                 return TMR_CLEAR_TASK_SET;
1934         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1935                 return TMR_LUN_RESET;
1936         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1937                 return TMR_TARGET_WARM_RESET;
1938         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1939                 return TMR_TARGET_COLD_RESET;
1940         default:
1941                 return TMR_UNKNOWN;
1942         }
1943 }
1944
1945 int
1946 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1947                            unsigned char *buf)
1948 {
1949         struct se_tmr_req *se_tmr;
1950         struct iscsi_tmr_req *tmr_req;
1951         struct iscsi_tm *hdr;
1952         int out_of_order_cmdsn = 0, ret;
1953         u8 function, tcm_function = TMR_UNKNOWN;
1954
1955         hdr                     = (struct iscsi_tm *) buf;
1956         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1957         function = hdr->flags;
1958
1959         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1960                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1961                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1962                 hdr->rtt, hdr->refcmdsn, conn->cid);
1963
1964         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1965             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1966              hdr->rtt != RESERVED_ITT)) {
1967                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1968                 hdr->rtt = RESERVED_ITT;
1969         }
1970
1971         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1972                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1973                 pr_err("Task Management Request TASK_REASSIGN not"
1974                         " issued as immediate command, bad iSCSI Initiator"
1975                                 "implementation\n");
1976                 return iscsit_add_reject_cmd(cmd,
1977                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1978         }
1979         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1980             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1981                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1982
1983         cmd->data_direction = DMA_NONE;
1984         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1985         if (!cmd->tmr_req) {
1986                 return iscsit_add_reject_cmd(cmd,
1987                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1988                                              buf);
1989         }
1990
1991         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1992                               conn->sess->se_sess, 0, DMA_NONE,
1993                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1994
1995         target_get_sess_cmd(&cmd->se_cmd, true);
1996
1997         /*
1998          * TASK_REASSIGN for ERL=2 / connection stays inside of
1999          * LIO-Target $FABRIC_MOD
2000          */
2001         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2002                 tcm_function = iscsit_convert_tmf(function);
2003                 if (tcm_function == TMR_UNKNOWN) {
2004                         pr_err("Unknown iSCSI TMR Function:"
2005                                " 0x%02x\n", function);
2006                         return iscsit_add_reject_cmd(cmd,
2007                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2008                 }
2009         }
2010         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2011                                  GFP_KERNEL);
2012         if (ret < 0)
2013                 return iscsit_add_reject_cmd(cmd,
2014                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2015
2016         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2017
2018         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2019         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2020         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2021         cmd->init_task_tag      = hdr->itt;
2022         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2023         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2024         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2025         se_tmr                  = cmd->se_cmd.se_tmr_req;
2026         tmr_req                 = cmd->tmr_req;
2027         /*
2028          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2029          */
2030         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2031                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2032                                                scsilun_to_int(&hdr->lun));
2033                 if (ret < 0) {
2034                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2035                         goto attach;
2036                 }
2037         }
2038
2039         switch (function) {
2040         case ISCSI_TM_FUNC_ABORT_TASK:
2041                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2042                 if (se_tmr->response)
2043                         goto attach;
2044                 break;
2045         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2046         case ISCSI_TM_FUNC_CLEAR_ACA:
2047         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2048         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2049                 break;
2050         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2051                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2052                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2053                         goto attach;
2054                 }
2055                 break;
2056         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2057                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2058                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2059                         goto attach;
2060                 }
2061                 break;
2062         case ISCSI_TM_FUNC_TASK_REASSIGN:
2063                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2064                 /*
2065                  * Perform sanity checks on the ExpDataSN only if the
2066                  * TASK_REASSIGN was successful.
2067                  */
2068                 if (se_tmr->response)
2069                         break;
2070
2071                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2072                         return iscsit_add_reject_cmd(cmd,
2073                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2074                 break;
2075         default:
2076                 pr_err("Unknown TMR function: 0x%02x, protocol"
2077                         " error.\n", function);
2078                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2079                 goto attach;
2080         }
2081
2082         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2083             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2084                 se_tmr->call_transport = 1;
2085 attach:
2086         spin_lock_bh(&conn->cmd_lock);
2087         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2088         spin_unlock_bh(&conn->cmd_lock);
2089
2090         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2091                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2092                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2093                         out_of_order_cmdsn = 1;
2094                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2095                         target_put_sess_cmd(&cmd->se_cmd);
2096                         return 0;
2097                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2098                         return -1;
2099                 }
2100         }
2101         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2102
2103         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2104                 return 0;
2105         /*
2106          * Found the referenced task, send to transport for processing.
2107          */
2108         if (se_tmr->call_transport)
2109                 return transport_generic_handle_tmr(&cmd->se_cmd);
2110
2111         /*
2112          * Could not find the referenced LUN, task, or Task Management
2113          * command not authorized or supported.  Change state and
2114          * let the tx_thread send the response.
2115          *
2116          * For connection recovery, this is also the default action for
2117          * TMR TASK_REASSIGN.
2118          */
2119         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2120         target_put_sess_cmd(&cmd->se_cmd);
2121         return 0;
2122 }
2123 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2124
2125 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2126 int
2127 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2128                       struct iscsi_text *hdr)
2129 {
2130         u32 payload_length = ntoh24(hdr->dlength);
2131
2132         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2133                 pr_err("Unable to accept text parameter length: %u"
2134                         "greater than MaxXmitDataSegmentLength %u.\n",
2135                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2136                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2137                                          (unsigned char *)hdr);
2138         }
2139
2140         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2141              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2142                 pr_err("Multi sequence text commands currently not supported\n");
2143                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2144                                         (unsigned char *)hdr);
2145         }
2146
2147         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2148                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2149                 hdr->exp_statsn, payload_length);
2150
2151         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2152         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2153         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2154         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2155         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2156         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2157         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2158         cmd->data_direction     = DMA_NONE;
2159         kfree(cmd->text_in_ptr);
2160         cmd->text_in_ptr        = NULL;
2161
2162         return 0;
2163 }
2164 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2165
2166 int
2167 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2168                         struct iscsi_text *hdr)
2169 {
2170         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2171         int cmdsn_ret;
2172
2173         if (!text_in) {
2174                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2175                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2176                         pr_err("Unable to locate text_in buffer for sendtargets"
2177                                " discovery\n");
2178                         goto reject;
2179                 }
2180                 goto empty_sendtargets;
2181         }
2182         if (strncmp("SendTargets", text_in, 11) != 0) {
2183                 pr_err("Received Text Data that is not"
2184                         " SendTargets, cannot continue.\n");
2185                 goto reject;
2186         }
2187         text_ptr = strchr(text_in, '=');
2188         if (!text_ptr) {
2189                 pr_err("No \"=\" separator found in Text Data,"
2190                         "  cannot continue.\n");
2191                 goto reject;
2192         }
2193         if (!strncmp("=All", text_ptr, 4)) {
2194                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2195         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2196                    !strncmp("=eui.", text_ptr, 5)) {
2197                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2198         } else {
2199                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2200                 goto reject;
2201         }
2202
2203         spin_lock_bh(&conn->cmd_lock);
2204         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2205         spin_unlock_bh(&conn->cmd_lock);
2206
2207 empty_sendtargets:
2208         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2209
2210         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2211                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2212                                 (unsigned char *)hdr, hdr->cmdsn);
2213                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2214                         return -1;
2215
2216                 return 0;
2217         }
2218
2219         return iscsit_execute_cmd(cmd, 0);
2220
2221 reject:
2222         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2223                                  (unsigned char *)hdr);
2224 }
2225 EXPORT_SYMBOL(iscsit_process_text_cmd);
2226
2227 static int
2228 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2229                        unsigned char *buf)
2230 {
2231         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2232         char *text_in = NULL;
2233         u32 payload_length = ntoh24(hdr->dlength);
2234         int rx_size, rc;
2235
2236         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2237         if (rc < 0)
2238                 return 0;
2239
2240         rx_size = payload_length;
2241         if (payload_length) {
2242                 u32 checksum = 0, data_crc = 0;
2243                 u32 padding = 0;
2244                 int niov = 0, rx_got;
2245                 struct kvec iov[2];
2246
2247                 rx_size = ALIGN(payload_length, 4);
2248                 text_in = kzalloc(rx_size, GFP_KERNEL);
2249                 if (!text_in)
2250                         goto reject;
2251
2252                 cmd->text_in_ptr = text_in;
2253
2254                 memset(iov, 0, sizeof(iov));
2255                 iov[niov].iov_base      = text_in;
2256                 iov[niov++].iov_len     = rx_size;
2257
2258                 padding = rx_size - payload_length;
2259                 if (padding)
2260                         pr_debug("Receiving %u additional bytes"
2261                                         " for padding.\n", padding);
2262                 if (conn->conn_ops->DataDigest) {
2263                         iov[niov].iov_base      = &checksum;
2264                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2265                         rx_size += ISCSI_CRC_LEN;
2266                 }
2267
2268                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2269                 if (rx_got != rx_size)
2270                         goto reject;
2271
2272                 if (conn->conn_ops->DataDigest) {
2273                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2274                                                   text_in, rx_size, 0, NULL,
2275                                                   &data_crc);
2276
2277                         if (checksum != data_crc) {
2278                                 pr_err("Text data CRC32C DataDigest"
2279                                         " 0x%08x does not match computed"
2280                                         " 0x%08x\n", checksum, data_crc);
2281                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2282                                         pr_err("Unable to recover from"
2283                                         " Text Data digest failure while in"
2284                                                 " ERL=0.\n");
2285                                         goto reject;
2286                                 } else {
2287                                         /*
2288                                          * Silently drop this PDU and let the
2289                                          * initiator plug the CmdSN gap.
2290                                          */
2291                                         pr_debug("Dropping Text"
2292                                         " Command CmdSN: 0x%08x due to"
2293                                         " DataCRC error.\n", hdr->cmdsn);
2294                                         kfree(text_in);
2295                                         return 0;
2296                                 }
2297                         } else {
2298                                 pr_debug("Got CRC32C DataDigest"
2299                                         " 0x%08x for %u bytes of text data.\n",
2300                                                 checksum, payload_length);
2301                         }
2302                 }
2303                 text_in[payload_length - 1] = '\0';
2304                 pr_debug("Successfully read %d bytes of text"
2305                                 " data.\n", payload_length);
2306         }
2307
2308         return iscsit_process_text_cmd(conn, cmd, hdr);
2309
2310 reject:
2311         kfree(cmd->text_in_ptr);
2312         cmd->text_in_ptr = NULL;
2313         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2314 }
2315
2316 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2317 {
2318         struct iscsi_conn *conn_p;
2319         struct iscsi_session *sess = conn->sess;
2320
2321         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2322                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2323
2324         atomic_set(&sess->session_logout, 1);
2325         atomic_set(&conn->conn_logout_remove, 1);
2326         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2327
2328         iscsit_inc_conn_usage_count(conn);
2329         iscsit_inc_session_usage_count(sess);
2330
2331         spin_lock_bh(&sess->conn_lock);
2332         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2333                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2334                         continue;
2335
2336                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2337                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2338         }
2339         spin_unlock_bh(&sess->conn_lock);
2340
2341         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2342
2343         return 0;
2344 }
2345
2346 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2347 {
2348         struct iscsi_conn *l_conn;
2349         struct iscsi_session *sess = conn->sess;
2350
2351         pr_debug("Received logout request CLOSECONNECTION for CID:"
2352                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2353
2354         /*
2355          * A Logout Request with a CLOSECONNECTION reason code for a CID
2356          * can arrive on a connection with a differing CID.
2357          */
2358         if (conn->cid == cmd->logout_cid) {
2359                 spin_lock_bh(&conn->state_lock);
2360                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2361                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2362
2363                 atomic_set(&conn->conn_logout_remove, 1);
2364                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2365                 iscsit_inc_conn_usage_count(conn);
2366
2367                 spin_unlock_bh(&conn->state_lock);
2368         } else {
2369                 /*
2370                  * Handle all different cid CLOSECONNECTION requests in
2371                  * iscsit_logout_post_handler_diffcid() as to give enough
2372                  * time for any non immediate command's CmdSN to be
2373                  * acknowledged on the connection in question.
2374                  *
2375                  * Here we simply make sure the CID is still around.
2376                  */
2377                 l_conn = iscsit_get_conn_from_cid(sess,
2378                                 cmd->logout_cid);
2379                 if (!l_conn) {
2380                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2381                         iscsit_add_cmd_to_response_queue(cmd, conn,
2382                                         cmd->i_state);
2383                         return 0;
2384                 }
2385
2386                 iscsit_dec_conn_usage_count(l_conn);
2387         }
2388
2389         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2390
2391         return 0;
2392 }
2393
2394 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2395 {
2396         struct iscsi_session *sess = conn->sess;
2397
2398         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2399                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2400
2401         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2402                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2403                         " while ERL!=2.\n");
2404                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2405                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2406                 return 0;
2407         }
2408
2409         if (conn->cid == cmd->logout_cid) {
2410                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411                         " with CID: %hu on CID: %hu, implementation error.\n",
2412                                 cmd->logout_cid, conn->cid);
2413                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2414                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415                 return 0;
2416         }
2417
2418         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2419
2420         return 0;
2421 }
2422
2423 int
2424 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2425                         unsigned char *buf)
2426 {
2427         int cmdsn_ret, logout_remove = 0;
2428         u8 reason_code = 0;
2429         struct iscsi_logout *hdr;
2430         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2431
2432         hdr                     = (struct iscsi_logout *) buf;
2433         reason_code             = (hdr->flags & 0x7f);
2434
2435         if (tiqn) {
2436                 spin_lock(&tiqn->logout_stats.lock);
2437                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2438                         tiqn->logout_stats.normal_logouts++;
2439                 else
2440                         tiqn->logout_stats.abnormal_logouts++;
2441                 spin_unlock(&tiqn->logout_stats.lock);
2442         }
2443
2444         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2445                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2446                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2447                 hdr->cid, conn->cid);
2448
2449         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2450                 pr_err("Received logout request on connection that"
2451                         " is not in logged in state, ignoring request.\n");
2452                 iscsit_free_cmd(cmd, false);
2453                 return 0;
2454         }
2455
2456         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2457         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2458         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2459         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2460         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2461         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2462         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2463         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2464         cmd->logout_reason      = reason_code;
2465         cmd->data_direction     = DMA_NONE;
2466
2467         /*
2468          * We need to sleep in these cases (by returning 1) until the Logout
2469          * Response gets sent in the tx thread.
2470          */
2471         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2472            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2473             be16_to_cpu(hdr->cid) == conn->cid))
2474                 logout_remove = 1;
2475
2476         spin_lock_bh(&conn->cmd_lock);
2477         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2478         spin_unlock_bh(&conn->cmd_lock);
2479
2480         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2481                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2482
2483         /*
2484          * Immediate commands are executed, well, immediately.
2485          * Non-Immediate Logout Commands are executed in CmdSN order.
2486          */
2487         if (cmd->immediate_cmd) {
2488                 int ret = iscsit_execute_cmd(cmd, 0);
2489
2490                 if (ret < 0)
2491                         return ret;
2492         } else {
2493                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2494                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2495                         logout_remove = 0;
2496                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2497                         return -1;
2498         }
2499
2500         return logout_remove;
2501 }
2502 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2503
2504 int iscsit_handle_snack(
2505         struct iscsi_conn *conn,
2506         unsigned char *buf)
2507 {
2508         struct iscsi_snack *hdr;
2509
2510         hdr                     = (struct iscsi_snack *) buf;
2511         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2512
2513         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2514                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2515                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2516                         hdr->begrun, hdr->runlength, conn->cid);
2517
2518         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2519                 pr_err("Initiator sent SNACK request while in"
2520                         " ErrorRecoveryLevel=0.\n");
2521                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2522                                          buf);
2523         }
2524         /*
2525          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2526          * call from inside iscsi_send_recovery_datain_or_r2t().
2527          */
2528         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2529         case 0:
2530                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2531                         hdr->itt,
2532                         be32_to_cpu(hdr->ttt),
2533                         be32_to_cpu(hdr->begrun),
2534                         be32_to_cpu(hdr->runlength));
2535         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2536                 return iscsit_handle_status_snack(conn, hdr->itt,
2537                         be32_to_cpu(hdr->ttt),
2538                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2539         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2540                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2541                         be32_to_cpu(hdr->begrun),
2542                         be32_to_cpu(hdr->runlength));
2543         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2544                 /* FIXME: Support R-Data SNACK */
2545                 pr_err("R-Data SNACK Not Supported.\n");
2546                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2547                                          buf);
2548         default:
2549                 pr_err("Unknown SNACK type 0x%02x, protocol"
2550                         " error.\n", hdr->flags & 0x0f);
2551                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2552                                          buf);
2553         }
2554
2555         return 0;
2556 }
2557 EXPORT_SYMBOL(iscsit_handle_snack);
2558
2559 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2560 {
2561         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2562             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2563                 wait_for_completion_interruptible_timeout(
2564                                         &conn->rx_half_close_comp,
2565                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2566         }
2567 }
2568
2569 static int iscsit_handle_immediate_data(
2570         struct iscsi_cmd *cmd,
2571         struct iscsi_scsi_req *hdr,
2572         u32 length)
2573 {
2574         int iov_ret, rx_got = 0, rx_size = 0;
2575         u32 checksum, iov_count = 0, padding = 0;
2576         struct iscsi_conn *conn = cmd->conn;
2577         struct kvec *iov;
2578
2579         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2580         if (iov_ret < 0)
2581                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2582
2583         rx_size = length;
2584         iov_count = iov_ret;
2585         iov = &cmd->iov_data[0];
2586
2587         padding = ((-length) & 3);
2588         if (padding != 0) {
2589                 iov[iov_count].iov_base = cmd->pad_bytes;
2590                 iov[iov_count++].iov_len = padding;
2591                 rx_size += padding;
2592         }
2593
2594         if (conn->conn_ops->DataDigest) {
2595                 iov[iov_count].iov_base         = &checksum;
2596                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2597                 rx_size += ISCSI_CRC_LEN;
2598         }
2599
2600         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2601
2602         iscsit_unmap_iovec(cmd);
2603
2604         if (rx_got != rx_size) {
2605                 iscsit_rx_thread_wait_for_tcp(conn);
2606                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2607         }
2608
2609         if (conn->conn_ops->DataDigest) {
2610                 u32 data_crc;
2611
2612                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2613                                                     cmd->write_data_done, length, padding,
2614                                                     cmd->pad_bytes);
2615
2616                 if (checksum != data_crc) {
2617                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2618                                 " does not match computed 0x%08x\n", checksum,
2619                                 data_crc);
2620
2621                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2622                                 pr_err("Unable to recover from"
2623                                         " Immediate Data digest failure while"
2624                                         " in ERL=0.\n");
2625                                 iscsit_reject_cmd(cmd,
2626                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2627                                                 (unsigned char *)hdr);
2628                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2629                         } else {
2630                                 iscsit_reject_cmd(cmd,
2631                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2632                                                 (unsigned char *)hdr);
2633                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2634                         }
2635                 } else {
2636                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2637                                 " %u bytes of Immediate Data\n", checksum,
2638                                 length);
2639                 }
2640         }
2641
2642         cmd->write_data_done += length;
2643
2644         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2645                 spin_lock_bh(&cmd->istate_lock);
2646                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2647                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2648                 spin_unlock_bh(&cmd->istate_lock);
2649         }
2650
2651         return IMMEDIATE_DATA_NORMAL_OPERATION;
2652 }
2653
2654 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2655         with active network interface */
2656 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2657 {
2658         struct iscsi_cmd *cmd;
2659         struct iscsi_conn *conn_p;
2660         bool found = false;
2661
2662         lockdep_assert_held(&conn->sess->conn_lock);
2663
2664         /*
2665          * Only send a Asynchronous Message on connections whos network
2666          * interface is still functional.
2667          */
2668         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2669                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2670                         iscsit_inc_conn_usage_count(conn_p);
2671                         found = true;
2672                         break;
2673                 }
2674         }
2675
2676         if (!found)
2677                 return;
2678
2679         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2680         if (!cmd) {
2681                 iscsit_dec_conn_usage_count(conn_p);
2682                 return;
2683         }
2684
2685         cmd->logout_cid = conn->cid;
2686         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2687         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2688
2689         spin_lock_bh(&conn_p->cmd_lock);
2690         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2691         spin_unlock_bh(&conn_p->cmd_lock);
2692
2693         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2694         iscsit_dec_conn_usage_count(conn_p);
2695 }
2696
2697 static int iscsit_send_conn_drop_async_message(
2698         struct iscsi_cmd *cmd,
2699         struct iscsi_conn *conn)
2700 {
2701         struct iscsi_async *hdr;
2702
2703         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2704
2705         hdr                     = (struct iscsi_async *) cmd->pdu;
2706         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2707         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2708         cmd->init_task_tag      = RESERVED_ITT;
2709         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2710         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2711         cmd->stat_sn            = conn->stat_sn++;
2712         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2713         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2714         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2715         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2716         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2717         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2718         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2719
2720         pr_debug("Sending Connection Dropped Async Message StatSN:"
2721                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2722                         cmd->logout_cid, conn->cid);
2723
2724         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2725 }
2726
2727 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2728 {
2729         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2730             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2731                 wait_for_completion_interruptible_timeout(
2732                                         &conn->tx_half_close_comp,
2733                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2734         }
2735 }
2736
2737 void
2738 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2739                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2740                         bool set_statsn)
2741 {
2742         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2743         hdr->flags              = datain->flags;
2744         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2745                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2746                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2747                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2748                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2749                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2750                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2751                 }
2752         }
2753         hton24(hdr->dlength, datain->length);
2754         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2755                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2756                                 (struct scsi_lun *)&hdr->lun);
2757         else
2758                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2759
2760         hdr->itt                = cmd->init_task_tag;
2761
2762         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2763                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2764         else
2765                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2766         if (set_statsn)
2767                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2768         else
2769                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2770
2771         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2772         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2773         hdr->datasn             = cpu_to_be32(datain->data_sn);
2774         hdr->offset             = cpu_to_be32(datain->offset);
2775
2776         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2777                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2778                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2779                 ntohl(hdr->offset), datain->length, conn->cid);
2780 }
2781 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2782
2783 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2784 {
2785         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2786         struct iscsi_datain datain;
2787         struct iscsi_datain_req *dr;
2788         int eodr = 0, ret;
2789         bool set_statsn = false;
2790
2791         memset(&datain, 0, sizeof(struct iscsi_datain));
2792         dr = iscsit_get_datain_values(cmd, &datain);
2793         if (!dr) {
2794                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2795                                 cmd->init_task_tag);
2796                 return -1;
2797         }
2798         /*
2799          * Be paranoid and double check the logic for now.
2800          */
2801         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2802                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2803                         " datain.length: %u exceeds cmd->data_length: %u\n",
2804                         cmd->init_task_tag, datain.offset, datain.length,
2805                         cmd->se_cmd.data_length);
2806                 return -1;
2807         }
2808
2809         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2810         /*
2811          * Special case for successfully execution w/ both DATAIN
2812          * and Sense Data.
2813          */
2814         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2815             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2816                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2817         else {
2818                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2819                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2820                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2821                         cmd->stat_sn = conn->stat_sn++;
2822                         set_statsn = true;
2823                 } else if (dr->dr_complete ==
2824                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2825                         set_statsn = true;
2826         }
2827
2828         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2829
2830         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2831         if (ret < 0)
2832                 return ret;
2833
2834         if (dr->dr_complete) {
2835                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2836                                 2 : 1;
2837                 iscsit_free_datain_req(cmd, dr);
2838         }
2839
2840         return eodr;
2841 }
2842
2843 int
2844 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2845                         struct iscsi_logout_rsp *hdr)
2846 {
2847         struct iscsi_conn *logout_conn = NULL;
2848         struct iscsi_conn_recovery *cr = NULL;
2849         struct iscsi_session *sess = conn->sess;
2850         /*
2851          * The actual shutting down of Sessions and/or Connections
2852          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2853          * is done in scsi_logout_post_handler().
2854          */
2855         switch (cmd->logout_reason) {
2856         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2857                 pr_debug("iSCSI session logout successful, setting"
2858                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2859                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2860                 break;
2861         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2862                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2863                         break;
2864                 /*
2865                  * For CLOSECONNECTION logout requests carrying
2866                  * a matching logout CID -> local CID, the reference
2867                  * for the local CID will have been incremented in
2868                  * iscsi_logout_closeconnection().
2869                  *
2870                  * For CLOSECONNECTION logout requests carrying
2871                  * a different CID than the connection it arrived
2872                  * on, the connection responding to cmd->logout_cid
2873                  * is stopped in iscsit_logout_post_handler_diffcid().
2874                  */
2875
2876                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2877                         " successful.\n", cmd->logout_cid, conn->cid);
2878                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2879                 break;
2880         case ISCSI_LOGOUT_REASON_RECOVERY:
2881                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2882                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2883                         break;
2884                 /*
2885                  * If the connection is still active from our point of view
2886                  * force connection recovery to occur.
2887                  */
2888                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2889                                 cmd->logout_cid);
2890                 if (logout_conn) {
2891                         iscsit_connection_reinstatement_rcfr(logout_conn);
2892                         iscsit_dec_conn_usage_count(logout_conn);
2893                 }
2894
2895                 cr = iscsit_get_inactive_connection_recovery_entry(
2896                                 conn->sess, cmd->logout_cid);
2897                 if (!cr) {
2898                         pr_err("Unable to locate CID: %hu for"
2899                         " REMOVECONNFORRECOVERY Logout Request.\n",
2900                                 cmd->logout_cid);
2901                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2902                         break;
2903                 }
2904
2905                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2906
2907                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2908                         " for recovery for CID: %hu on CID: %hu successful.\n",
2909                                 cmd->logout_cid, conn->cid);
2910                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2911                 break;
2912         default:
2913                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2914                                 cmd->logout_reason);
2915                 return -1;
2916         }
2917
2918         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2919         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2920         hdr->response           = cmd->logout_response;
2921         hdr->itt                = cmd->init_task_tag;
2922         cmd->stat_sn            = conn->stat_sn++;
2923         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2924
2925         iscsit_increment_maxcmdsn(cmd, conn->sess);
2926         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2927         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2928
2929         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2930                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2931                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2932                 cmd->logout_cid, conn->cid);
2933
2934         return 0;
2935 }
2936 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2937
2938 static int
2939 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2940 {
2941         int rc;
2942
2943         rc = iscsit_build_logout_rsp(cmd, conn,
2944                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2945         if (rc < 0)
2946                 return rc;
2947
2948         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2949 }
2950
2951 void
2952 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2953                        struct iscsi_nopin *hdr, bool nopout_response)
2954 {
2955         hdr->opcode             = ISCSI_OP_NOOP_IN;
2956         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2957         hton24(hdr->dlength, cmd->buf_ptr_size);
2958         if (nopout_response)
2959                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2960         hdr->itt                = cmd->init_task_tag;
2961         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2962         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2963                                   conn->stat_sn;
2964         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2965
2966         if (nopout_response)
2967                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2968
2969         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2970         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2971
2972         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2973                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2974                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2975                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2976 }
2977 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2978
2979 /*
2980  *      Unsolicited NOPIN, either requesting a response or not.
2981  */
2982 static int iscsit_send_unsolicited_nopin(
2983         struct iscsi_cmd *cmd,
2984         struct iscsi_conn *conn,
2985         int want_response)
2986 {
2987         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2988         int ret;
2989
2990         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2991
2992         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2993                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2994
2995         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2996         if (ret < 0)
2997                 return ret;
2998
2999         spin_lock_bh(&cmd->istate_lock);
3000         cmd->i_state = want_response ?
3001                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3002         spin_unlock_bh(&cmd->istate_lock);
3003
3004         return 0;
3005 }
3006
3007 static int
3008 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3009 {
3010         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3011
3012         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3013
3014         /*
3015          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3016          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3017          */
3018         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3019
3020         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3021                                                      cmd->buf_ptr,
3022                                                      cmd->buf_ptr_size);
3023 }
3024
3025 static int iscsit_send_r2t(
3026         struct iscsi_cmd *cmd,
3027         struct iscsi_conn *conn)
3028 {
3029         struct iscsi_r2t *r2t;
3030         struct iscsi_r2t_rsp *hdr;
3031         int ret;
3032
3033         r2t = iscsit_get_r2t_from_list(cmd);
3034         if (!r2t)
3035                 return -1;
3036
3037         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3038         memset(hdr, 0, ISCSI_HDR_LEN);
3039         hdr->opcode             = ISCSI_OP_R2T;
3040         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3041         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3042                         (struct scsi_lun *)&hdr->lun);
3043         hdr->itt                = cmd->init_task_tag;
3044         if (conn->conn_transport->iscsit_get_r2t_ttt)
3045                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3046         else
3047                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3048         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3049         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3050         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3051         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3052         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3053         hdr->data_offset        = cpu_to_be32(r2t->offset);
3054         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3055
3056         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3057                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3058                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3059                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3060                         r2t->offset, r2t->xfer_len, conn->cid);
3061
3062         spin_lock_bh(&cmd->r2t_lock);
3063         r2t->sent_r2t = 1;
3064         spin_unlock_bh(&cmd->r2t_lock);
3065
3066         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3067         if (ret < 0) {
3068                 return ret;
3069         }
3070
3071         spin_lock_bh(&cmd->dataout_timeout_lock);
3072         iscsit_start_dataout_timer(cmd, conn);
3073         spin_unlock_bh(&cmd->dataout_timeout_lock);
3074
3075         return 0;
3076 }
3077
3078 /*
3079  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3080  *              connection recovery.
3081  */
3082 int iscsit_build_r2ts_for_cmd(
3083         struct iscsi_conn *conn,
3084         struct iscsi_cmd *cmd,
3085         bool recovery)
3086 {
3087         int first_r2t = 1;
3088         u32 offset = 0, xfer_len = 0;
3089
3090         spin_lock_bh(&cmd->r2t_lock);
3091         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3092                 spin_unlock_bh(&cmd->r2t_lock);
3093                 return 0;
3094         }
3095
3096         if (conn->sess->sess_ops->DataSequenceInOrder &&
3097             !recovery)
3098                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3099
3100         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3101                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3102                         offset = cmd->r2t_offset;
3103
3104                         if (first_r2t && recovery) {
3105                                 int new_data_end = offset +
3106                                         conn->sess->sess_ops->MaxBurstLength -
3107                                         cmd->next_burst_len;
3108
3109                                 if (new_data_end > cmd->se_cmd.data_length)
3110                                         xfer_len = cmd->se_cmd.data_length - offset;
3111                                 else
3112                                         xfer_len =
3113                                                 conn->sess->sess_ops->MaxBurstLength -
3114                                                 cmd->next_burst_len;
3115                         } else {
3116                                 int new_data_end = offset +
3117                                         conn->sess->sess_ops->MaxBurstLength;
3118
3119                                 if (new_data_end > cmd->se_cmd.data_length)
3120                                         xfer_len = cmd->se_cmd.data_length - offset;
3121                                 else
3122                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3123                         }
3124                         cmd->r2t_offset += xfer_len;
3125
3126                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3127                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3128                 } else {
3129                         struct iscsi_seq *seq;
3130
3131                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3132                         if (!seq) {
3133                                 spin_unlock_bh(&cmd->r2t_lock);
3134                                 return -1;
3135                         }
3136
3137                         offset = seq->offset;
3138                         xfer_len = seq->xfer_len;
3139
3140                         if (cmd->seq_send_order == cmd->seq_count)
3141                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3142                 }
3143                 cmd->outstanding_r2ts++;
3144                 first_r2t = 0;
3145
3146                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3147                         spin_unlock_bh(&cmd->r2t_lock);
3148                         return -1;
3149                 }
3150
3151                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3152                         break;
3153         }
3154         spin_unlock_bh(&cmd->r2t_lock);
3155
3156         return 0;
3157 }
3158 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3159
3160 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3161                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3162 {
3163         if (inc_stat_sn)
3164                 cmd->stat_sn = conn->stat_sn++;
3165
3166         atomic_long_inc(&conn->sess->rsp_pdus);
3167
3168         memset(hdr, 0, ISCSI_HDR_LEN);
3169         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3170         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3171         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3172                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3173                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3174         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3175                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3176                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3177         }
3178         hdr->response           = cmd->iscsi_response;
3179         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3180         hdr->itt                = cmd->init_task_tag;
3181         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3182
3183         iscsit_increment_maxcmdsn(cmd, conn->sess);
3184         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3185         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3186
3187         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3188                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3189                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3190                 cmd->se_cmd.scsi_status, conn->cid);
3191 }
3192 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3193
3194 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3195 {
3196         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3197         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3198         void *data_buf = NULL;
3199         u32 padding = 0, data_buf_len = 0;
3200
3201         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3202
3203         /*
3204          * Attach SENSE DATA payload to iSCSI Response PDU
3205          */
3206         if (cmd->se_cmd.sense_buffer &&
3207            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3208             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3209                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3210                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3211
3212                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3213                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3214                 data_buf = cmd->sense_buffer;
3215                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3216
3217                 if (padding) {
3218                         memset(cmd->sense_buffer +
3219                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3220                         pr_debug("Adding %u bytes of padding to"
3221                                 " SENSE.\n", padding);
3222                 }
3223
3224                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3225                                 " Response PDU\n",
3226                                 cmd->se_cmd.scsi_sense_length);
3227         }
3228
3229         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3230                                                      data_buf_len);
3231 }
3232
3233 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3234 {
3235         switch (se_tmr->response) {
3236         case TMR_FUNCTION_COMPLETE:
3237                 return ISCSI_TMF_RSP_COMPLETE;
3238         case TMR_TASK_DOES_NOT_EXIST:
3239                 return ISCSI_TMF_RSP_NO_TASK;
3240         case TMR_LUN_DOES_NOT_EXIST:
3241                 return ISCSI_TMF_RSP_NO_LUN;
3242         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3243                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3244         case TMR_FUNCTION_REJECTED:
3245         default:
3246                 return ISCSI_TMF_RSP_REJECTED;
3247         }
3248 }
3249
3250 void
3251 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3252                           struct iscsi_tm_rsp *hdr)
3253 {
3254         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3255
3256         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3257         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3258         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3259         hdr->itt                = cmd->init_task_tag;
3260         cmd->stat_sn            = conn->stat_sn++;
3261         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3262
3263         iscsit_increment_maxcmdsn(cmd, conn->sess);
3264         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3265         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3266
3267         pr_debug("Built Task Management Response ITT: 0x%08x,"
3268                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3269                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3270 }
3271 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3272
3273 static int
3274 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3275 {
3276         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3277
3278         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3279
3280         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3281 }
3282
3283 #define SENDTARGETS_BUF_LIMIT 32768U
3284
3285 static int
3286 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3287                                   enum iscsit_transport_type network_transport,
3288                                   int skip_bytes, bool *completed)
3289 {
3290         char *payload = NULL;
3291         struct iscsi_conn *conn = cmd->conn;
3292         struct iscsi_portal_group *tpg;
3293         struct iscsi_tiqn *tiqn;
3294         struct iscsi_tpg_np *tpg_np;
3295         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3296         int target_name_printed;
3297         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3298         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3299         bool active;
3300
3301         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3302                          SENDTARGETS_BUF_LIMIT);
3303
3304         payload = kzalloc(buffer_len, GFP_KERNEL);
3305         if (!payload)
3306                 return -ENOMEM;
3307
3308         /*
3309          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3310          * explicit case..
3311          */
3312         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3313                 text_ptr = strchr(text_in, '=');
3314                 if (!text_ptr) {
3315                         pr_err("Unable to locate '=' string in text_in:"
3316                                " %s\n", text_in);
3317                         kfree(payload);
3318                         return -EINVAL;
3319                 }
3320                 /*
3321                  * Skip over '=' character..
3322                  */
3323                 text_ptr += 1;
3324         }
3325
3326         spin_lock(&tiqn_lock);
3327         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3328                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3329                      strcmp(tiqn->tiqn, text_ptr)) {
3330                         continue;
3331                 }
3332
3333                 target_name_printed = 0;
3334
3335                 spin_lock(&tiqn->tiqn_tpg_lock);
3336                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3337
3338                         /* If demo_mode_discovery=0 and generate_node_acls=0
3339                          * (demo mode dislabed) do not return
3340                          * TargetName+TargetAddress unless a NodeACL exists.
3341                          */
3342
3343                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3344                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3345                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3346                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3347                                 continue;
3348                         }
3349
3350                         spin_lock(&tpg->tpg_state_lock);
3351                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3352                         spin_unlock(&tpg->tpg_state_lock);
3353
3354                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3355                                 continue;
3356
3357                         spin_lock(&tpg->tpg_np_lock);
3358                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3359                                                 tpg_np_list) {
3360                                 struct iscsi_np *np = tpg_np->tpg_np;
3361                                 struct sockaddr_storage *sockaddr;
3362
3363                                 if (np->np_network_transport != network_transport)
3364                                         continue;
3365
3366                                 if (!target_name_printed) {
3367                                         len = sprintf(buf, "TargetName=%s",
3368                                                       tiqn->tiqn);
3369                                         len += 1;
3370
3371                                         if ((len + payload_len) > buffer_len) {
3372                                                 spin_unlock(&tpg->tpg_np_lock);
3373                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3374                                                 end_of_buf = 1;
3375                                                 goto eob;
3376                                         }
3377
3378                                         if (skip_bytes && len <= skip_bytes) {
3379                                                 skip_bytes -= len;
3380                                         } else {
3381                                                 memcpy(payload + payload_len, buf, len);
3382                                                 payload_len += len;
3383                                                 target_name_printed = 1;
3384                                                 if (len > skip_bytes)
3385                                                         skip_bytes = 0;
3386                                         }
3387                                 }
3388
3389                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3390                                         sockaddr = &conn->local_sockaddr;
3391                                 else
3392                                         sockaddr = &np->np_sockaddr;
3393
3394                                 len = sprintf(buf, "TargetAddress="
3395                                               "%pISpc,%hu",
3396                                               sockaddr,
3397                                               tpg->tpgt);
3398                                 len += 1;
3399
3400                                 if ((len + payload_len) > buffer_len) {
3401                                         spin_unlock(&tpg->tpg_np_lock);
3402                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3403                                         end_of_buf = 1;
3404                                         goto eob;
3405                                 }
3406
3407                                 if (skip_bytes && len <= skip_bytes) {
3408                                         skip_bytes -= len;
3409                                 } else {
3410                                         memcpy(payload + payload_len, buf, len);
3411                                         payload_len += len;
3412                                         if (len > skip_bytes)
3413                                                 skip_bytes = 0;
3414                                 }
3415                         }
3416                         spin_unlock(&tpg->tpg_np_lock);
3417                 }
3418                 spin_unlock(&tiqn->tiqn_tpg_lock);
3419 eob:
3420                 if (end_of_buf) {
3421                         *completed = false;
3422                         break;
3423                 }
3424
3425                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3426                         break;
3427         }
3428         spin_unlock(&tiqn_lock);
3429
3430         cmd->buf_ptr = payload;
3431
3432         return payload_len;
3433 }
3434
3435 int
3436 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3437                       struct iscsi_text_rsp *hdr,
3438                       enum iscsit_transport_type network_transport)
3439 {
3440         int text_length, padding;
3441         bool completed = true;
3442
3443         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3444                                                         cmd->read_data_done,
3445                                                         &completed);
3446         if (text_length < 0)
3447                 return text_length;
3448
3449         if (completed) {
3450                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3451         } else {
3452                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3453                 cmd->read_data_done += text_length;
3454                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3455                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3456         }
3457         hdr->opcode = ISCSI_OP_TEXT_RSP;
3458         padding = ((-text_length) & 3);
3459         hton24(hdr->dlength, text_length);
3460         hdr->itt = cmd->init_task_tag;
3461         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3462         cmd->stat_sn = conn->stat_sn++;
3463         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3464
3465         iscsit_increment_maxcmdsn(cmd, conn->sess);
3466         /*
3467          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3468          * correctly increment MaxCmdSN for each response answering a
3469          * non immediate text request with a valid CmdSN.
3470          */
3471         cmd->maxcmdsn_inc = 0;
3472         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3473         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3474
3475         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3476                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3477                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3478                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3479                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3480
3481         return text_length + padding;
3482 }
3483 EXPORT_SYMBOL(iscsit_build_text_rsp);
3484
3485 static int iscsit_send_text_rsp(
3486         struct iscsi_cmd *cmd,
3487         struct iscsi_conn *conn)
3488 {
3489         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3490         int text_length;
3491
3492         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3493                                 conn->conn_transport->transport_type);
3494         if (text_length < 0)
3495                 return text_length;
3496
3497         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3498                                                      cmd->buf_ptr,
3499                                                      text_length);
3500 }
3501
3502 void
3503 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3504                     struct iscsi_reject *hdr)
3505 {
3506         hdr->opcode             = ISCSI_OP_REJECT;
3507         hdr->reason             = cmd->reject_reason;
3508         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3509         hton24(hdr->dlength, ISCSI_HDR_LEN);
3510         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3511         cmd->stat_sn            = conn->stat_sn++;
3512         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3513         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3514         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3515
3516 }
3517 EXPORT_SYMBOL(iscsit_build_reject);
3518
3519 static int iscsit_send_reject(
3520         struct iscsi_cmd *cmd,
3521         struct iscsi_conn *conn)
3522 {
3523         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3524
3525         iscsit_build_reject(cmd, conn, hdr);
3526
3527         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3528                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3529
3530         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3531                                                      cmd->buf_ptr,
3532                                                      ISCSI_HDR_LEN);
3533 }
3534
3535 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3536 {
3537         int ord, cpu;
3538         /*
3539          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3540          * within iscsit_start_kthreads()
3541          *
3542          * Here we use bitmap_id to determine which CPU that this
3543          * iSCSI connection's RX/TX threads will be scheduled to
3544          * execute upon.
3545          */
3546         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3547         for_each_online_cpu(cpu) {
3548                 if (ord-- == 0) {
3549                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3550                         return;
3551                 }
3552         }
3553         /*
3554          * This should never be reached..
3555          */
3556         dump_stack();
3557         cpumask_setall(conn->conn_cpumask);
3558 }
3559
3560 int
3561 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3562 {
3563         int ret;
3564
3565         switch (state) {
3566         case ISTATE_SEND_R2T:
3567                 ret = iscsit_send_r2t(cmd, conn);
3568                 if (ret < 0)
3569                         goto err;
3570                 break;
3571         case ISTATE_REMOVE:
3572                 spin_lock_bh(&conn->cmd_lock);
3573                 list_del_init(&cmd->i_conn_node);
3574                 spin_unlock_bh(&conn->cmd_lock);
3575
3576                 iscsit_free_cmd(cmd, false);
3577                 break;
3578         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3579                 iscsit_mod_nopin_response_timer(conn);
3580                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3581                 if (ret < 0)
3582                         goto err;
3583                 break;
3584         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3585                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3586                 if (ret < 0)
3587                         goto err;
3588                 break;
3589         default:
3590                 pr_err("Unknown Opcode: 0x%02x ITT:"
3591                        " 0x%08x, i_state: %d on CID: %hu\n",
3592                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3593                        conn->cid);
3594                 goto err;
3595         }
3596
3597         return 0;
3598
3599 err:
3600         return -1;
3601 }
3602 EXPORT_SYMBOL(iscsit_immediate_queue);
3603
3604 static int
3605 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3606 {
3607         struct iscsit_transport *t = conn->conn_transport;
3608         struct iscsi_queue_req *qr;
3609         struct iscsi_cmd *cmd;
3610         u8 state;
3611         int ret;
3612
3613         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3614                 atomic_set(&conn->check_immediate_queue, 0);
3615                 cmd = qr->cmd;
3616                 state = qr->state;
3617                 kmem_cache_free(lio_qr_cache, qr);
3618
3619                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3620                 if (ret < 0)
3621                         return ret;
3622         }
3623
3624         return 0;
3625 }
3626
3627 int
3628 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3629 {
3630         int ret;
3631
3632 check_rsp_state:
3633         switch (state) {
3634         case ISTATE_SEND_DATAIN:
3635                 ret = iscsit_send_datain(cmd, conn);
3636                 if (ret < 0)
3637                         goto err;
3638                 else if (!ret)
3639                         /* more drs */
3640                         goto check_rsp_state;
3641                 else if (ret == 1) {
3642                         /* all done */
3643                         spin_lock_bh(&cmd->istate_lock);
3644                         cmd->i_state = ISTATE_SENT_STATUS;
3645                         spin_unlock_bh(&cmd->istate_lock);
3646
3647                         if (atomic_read(&conn->check_immediate_queue))
3648                                 return 1;
3649
3650                         return 0;
3651                 } else if (ret == 2) {
3652                         /* Still must send status,
3653                            SCF_TRANSPORT_TASK_SENSE was set */
3654                         spin_lock_bh(&cmd->istate_lock);
3655                         cmd->i_state = ISTATE_SEND_STATUS;
3656                         spin_unlock_bh(&cmd->istate_lock);
3657                         state = ISTATE_SEND_STATUS;
3658                         goto check_rsp_state;
3659                 }
3660
3661                 break;
3662         case ISTATE_SEND_STATUS:
3663         case ISTATE_SEND_STATUS_RECOVERY:
3664                 ret = iscsit_send_response(cmd, conn);
3665                 break;
3666         case ISTATE_SEND_LOGOUTRSP:
3667                 ret = iscsit_send_logout(cmd, conn);
3668                 break;
3669         case ISTATE_SEND_ASYNCMSG:
3670                 ret = iscsit_send_conn_drop_async_message(
3671                         cmd, conn);
3672                 break;
3673         case ISTATE_SEND_NOPIN:
3674                 ret = iscsit_send_nopin(cmd, conn);
3675                 break;
3676         case ISTATE_SEND_REJECT:
3677                 ret = iscsit_send_reject(cmd, conn);
3678                 break;
3679         case ISTATE_SEND_TASKMGTRSP:
3680                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3681                 if (ret != 0)
3682                         break;
3683                 ret = iscsit_tmr_post_handler(cmd, conn);
3684                 if (ret != 0)
3685                         iscsit_fall_back_to_erl0(conn->sess);
3686                 break;
3687         case ISTATE_SEND_TEXTRSP:
3688                 ret = iscsit_send_text_rsp(cmd, conn);
3689                 break;
3690         default:
3691                 pr_err("Unknown Opcode: 0x%02x ITT:"
3692                        " 0x%08x, i_state: %d on CID: %hu\n",
3693                        cmd->iscsi_opcode, cmd->init_task_tag,
3694                        state, conn->cid);
3695                 goto err;
3696         }
3697         if (ret < 0)
3698                 goto err;
3699
3700         switch (state) {
3701         case ISTATE_SEND_LOGOUTRSP:
3702                 if (!iscsit_logout_post_handler(cmd, conn))
3703                         return -ECONNRESET;
3704                 /* fall through */
3705         case ISTATE_SEND_STATUS:
3706         case ISTATE_SEND_ASYNCMSG:
3707         case ISTATE_SEND_NOPIN:
3708         case ISTATE_SEND_STATUS_RECOVERY:
3709         case ISTATE_SEND_TEXTRSP:
3710         case ISTATE_SEND_TASKMGTRSP:
3711         case ISTATE_SEND_REJECT:
3712                 spin_lock_bh(&cmd->istate_lock);
3713                 cmd->i_state = ISTATE_SENT_STATUS;
3714                 spin_unlock_bh(&cmd->istate_lock);
3715                 break;
3716         default:
3717                 pr_err("Unknown Opcode: 0x%02x ITT:"
3718                        " 0x%08x, i_state: %d on CID: %hu\n",
3719                        cmd->iscsi_opcode, cmd->init_task_tag,
3720                        cmd->i_state, conn->cid);
3721                 goto err;
3722         }
3723
3724         if (atomic_read(&conn->check_immediate_queue))
3725                 return 1;
3726
3727         return 0;
3728
3729 err:
3730         return -1;
3731 }
3732 EXPORT_SYMBOL(iscsit_response_queue);
3733
3734 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3735 {
3736         struct iscsit_transport *t = conn->conn_transport;
3737         struct iscsi_queue_req *qr;
3738         struct iscsi_cmd *cmd;
3739         u8 state;
3740         int ret;
3741
3742         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3743                 cmd = qr->cmd;
3744                 state = qr->state;
3745                 kmem_cache_free(lio_qr_cache, qr);
3746
3747                 ret = t->iscsit_response_queue(conn, cmd, state);
3748                 if (ret == 1 || ret < 0)
3749                         return ret;
3750         }
3751
3752         return 0;
3753 }
3754
3755 int iscsi_target_tx_thread(void *arg)
3756 {
3757         int ret = 0;
3758         struct iscsi_conn *conn = arg;
3759         bool conn_freed = false;
3760
3761         /*
3762          * Allow ourselves to be interrupted by SIGINT so that a
3763          * connection recovery / failure event can be triggered externally.
3764          */
3765         allow_signal(SIGINT);
3766
3767         while (!kthread_should_stop()) {
3768                 /*
3769                  * Ensure that both TX and RX per connection kthreads
3770                  * are scheduled to run on the same CPU.
3771                  */
3772                 iscsit_thread_check_cpumask(conn, current, 1);
3773
3774                 wait_event_interruptible(conn->queues_wq,
3775                                          !iscsit_conn_all_queues_empty(conn));
3776
3777                 if (signal_pending(current))
3778                         goto transport_err;
3779
3780 get_immediate:
3781                 ret = iscsit_handle_immediate_queue(conn);
3782                 if (ret < 0)
3783                         goto transport_err;
3784
3785                 ret = iscsit_handle_response_queue(conn);
3786                 if (ret == 1) {
3787                         goto get_immediate;
3788                 } else if (ret == -ECONNRESET) {
3789                         conn_freed = true;
3790                         goto out;
3791                 } else if (ret < 0) {
3792                         goto transport_err;
3793                 }
3794         }
3795
3796 transport_err:
3797         /*
3798          * Avoid the normal connection failure code-path if this connection
3799          * is still within LOGIN mode, and iscsi_np process context is
3800          * responsible for cleaning up the early connection failure.
3801          */
3802         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3803                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3804 out:
3805         if (!conn_freed) {
3806                 while (!kthread_should_stop()) {
3807                         msleep(100);
3808                 }
3809         }
3810         return 0;
3811 }
3812
3813 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3814 {
3815         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3816         struct iscsi_cmd *cmd;
3817         int ret = 0;
3818
3819         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3820         case ISCSI_OP_SCSI_CMD:
3821                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3822                 if (!cmd)
3823                         goto reject;
3824
3825                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3826                 break;
3827         case ISCSI_OP_SCSI_DATA_OUT:
3828                 ret = iscsit_handle_data_out(conn, buf);
3829                 break;
3830         case ISCSI_OP_NOOP_OUT:
3831                 cmd = NULL;
3832                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3833                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3834                         if (!cmd)
3835                                 goto reject;
3836                 }
3837                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3838                 break;
3839         case ISCSI_OP_SCSI_TMFUNC:
3840                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3841                 if (!cmd)
3842                         goto reject;
3843
3844                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3845                 break;
3846         case ISCSI_OP_TEXT:
3847                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3848                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3849                         if (!cmd)
3850                                 goto reject;
3851                 } else {
3852                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3853                         if (!cmd)
3854                                 goto reject;
3855                 }
3856
3857                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3858                 break;
3859         case ISCSI_OP_LOGOUT:
3860                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3861                 if (!cmd)
3862                         goto reject;
3863
3864                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3865                 if (ret > 0)
3866                         wait_for_completion_timeout(&conn->conn_logout_comp,
3867                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3868                 break;
3869         case ISCSI_OP_SNACK:
3870                 ret = iscsit_handle_snack(conn, buf);
3871                 break;
3872         default:
3873                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3874                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3875                         pr_err("Cannot recover from unknown"
3876                         " opcode while ERL=0, closing iSCSI connection.\n");
3877                         return -1;
3878                 }
3879                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3880                        " closing iSCSI connection.\n");
3881                 ret = -1;
3882                 break;
3883         }
3884
3885         return ret;
3886 reject:
3887         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3888 }
3889
3890 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3891 {
3892         bool ret;
3893
3894         spin_lock_bh(&conn->state_lock);
3895         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3896         spin_unlock_bh(&conn->state_lock);
3897
3898         return ret;
3899 }
3900
3901 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3902 {
3903         int ret;
3904         u8 *buffer, opcode;
3905         u32 checksum = 0, digest = 0;
3906         struct kvec iov;
3907
3908         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3909         if (!buffer)
3910                 return;
3911
3912         while (!kthread_should_stop()) {
3913                 /*
3914                  * Ensure that both TX and RX per connection kthreads
3915                  * are scheduled to run on the same CPU.
3916                  */
3917                 iscsit_thread_check_cpumask(conn, current, 0);
3918
3919                 memset(&iov, 0, sizeof(struct kvec));
3920
3921                 iov.iov_base    = buffer;
3922                 iov.iov_len     = ISCSI_HDR_LEN;
3923
3924                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3925                 if (ret != ISCSI_HDR_LEN) {
3926                         iscsit_rx_thread_wait_for_tcp(conn);
3927                         break;
3928                 }
3929
3930                 if (conn->conn_ops->HeaderDigest) {
3931                         iov.iov_base    = &digest;
3932                         iov.iov_len     = ISCSI_CRC_LEN;
3933
3934                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3935                         if (ret != ISCSI_CRC_LEN) {
3936                                 iscsit_rx_thread_wait_for_tcp(conn);
3937                                 break;
3938                         }
3939
3940                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3941                                                   ISCSI_HDR_LEN, 0, NULL,
3942                                                   &checksum);
3943
3944                         if (digest != checksum) {
3945                                 pr_err("HeaderDigest CRC32C failed,"
3946                                         " received 0x%08x, computed 0x%08x\n",
3947                                         digest, checksum);
3948                                 /*
3949                                  * Set the PDU to 0xff so it will intentionally
3950                                  * hit default in the switch below.
3951                                  */
3952                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3953                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3954                         } else {
3955                                 pr_debug("Got HeaderDigest CRC32C"
3956                                                 " 0x%08x\n", checksum);
3957                         }
3958                 }
3959
3960                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3961                         break;
3962
3963                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3964
3965                 if (conn->sess->sess_ops->SessionType &&
3966                    ((!(opcode & ISCSI_OP_TEXT)) ||
3967                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3968                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3969                         " while in Discovery Session, rejecting.\n", opcode);
3970                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3971                                           buffer);
3972                         break;
3973                 }
3974
3975                 ret = iscsi_target_rx_opcode(conn, buffer);
3976                 if (ret < 0)
3977                         break;
3978         }
3979
3980         kfree(buffer);
3981 }
3982
3983 int iscsi_target_rx_thread(void *arg)
3984 {
3985         int rc;
3986         struct iscsi_conn *conn = arg;
3987         bool conn_freed = false;
3988
3989         /*
3990          * Allow ourselves to be interrupted by SIGINT so that a
3991          * connection recovery / failure event can be triggered externally.
3992          */
3993         allow_signal(SIGINT);
3994         /*
3995          * Wait for iscsi_post_login_handler() to complete before allowing
3996          * incoming iscsi/tcp socket I/O, and/or failing the connection.
3997          */
3998         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
3999         if (rc < 0 || iscsi_target_check_conn_state(conn))
4000                 goto out;
4001
4002         if (!conn->conn_transport->iscsit_get_rx_pdu)
4003                 return 0;
4004
4005         conn->conn_transport->iscsit_get_rx_pdu(conn);
4006
4007         if (!signal_pending(current))
4008                 atomic_set(&conn->transport_failed, 1);
4009         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4010
4011 out:
4012         if (!conn_freed) {
4013                 while (!kthread_should_stop()) {
4014                         msleep(100);
4015                 }
4016         }
4017
4018         return 0;
4019 }
4020
4021 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4022 {
4023         LIST_HEAD(tmp_list);
4024         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4025         struct iscsi_session *sess = conn->sess;
4026         /*
4027          * We expect this function to only ever be called from either RX or TX
4028          * thread context via iscsit_close_connection() once the other context
4029          * has been reset -> returned sleeping pre-handler state.
4030          */
4031         spin_lock_bh(&conn->cmd_lock);
4032         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4033
4034         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4035                 struct se_cmd *se_cmd = &cmd->se_cmd;
4036
4037                 if (se_cmd->se_tfo != NULL) {
4038                         spin_lock_irq(&se_cmd->t_state_lock);
4039                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4040                         spin_unlock_irq(&se_cmd->t_state_lock);
4041                 }
4042         }
4043         spin_unlock_bh(&conn->cmd_lock);
4044
4045         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4046                 list_del_init(&cmd->i_conn_node);
4047
4048                 iscsit_increment_maxcmdsn(cmd, sess);
4049                 iscsit_free_cmd(cmd, true);
4050
4051         }
4052 }
4053
4054 static void iscsit_stop_timers_for_cmds(
4055         struct iscsi_conn *conn)
4056 {
4057         struct iscsi_cmd *cmd;
4058
4059         spin_lock_bh(&conn->cmd_lock);
4060         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4061                 if (cmd->data_direction == DMA_TO_DEVICE)
4062                         iscsit_stop_dataout_timer(cmd);
4063         }
4064         spin_unlock_bh(&conn->cmd_lock);
4065 }
4066
4067 int iscsit_close_connection(
4068         struct iscsi_conn *conn)
4069 {
4070         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4071         struct iscsi_session    *sess = conn->sess;
4072
4073         pr_debug("Closing iSCSI connection CID %hu on SID:"
4074                 " %u\n", conn->cid, sess->sid);
4075         /*
4076          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4077          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4078          * sleeping and the logout response never got sent because the
4079          * connection failed.
4080          *
4081          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4082          * to signal logout response TX interrupt completion.  Go ahead and skip
4083          * this for iser since isert_rx_opcode() does not wait on logout failure,
4084          * and to avoid iscsi_conn pointer dereference in iser-target code.
4085          */
4086         if (!conn->conn_transport->rdma_shutdown)
4087                 complete(&conn->conn_logout_comp);
4088
4089         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4090                 if (conn->tx_thread &&
4091                     cmpxchg(&conn->tx_thread_active, true, false)) {
4092                         send_sig(SIGINT, conn->tx_thread, 1);
4093                         kthread_stop(conn->tx_thread);
4094                 }
4095         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4096                 if (conn->rx_thread &&
4097                     cmpxchg(&conn->rx_thread_active, true, false)) {
4098                         send_sig(SIGINT, conn->rx_thread, 1);
4099                         kthread_stop(conn->rx_thread);
4100                 }
4101         }
4102
4103         spin_lock(&iscsit_global->ts_bitmap_lock);
4104         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4105                               get_order(1));
4106         spin_unlock(&iscsit_global->ts_bitmap_lock);
4107
4108         iscsit_stop_timers_for_cmds(conn);
4109         iscsit_stop_nopin_response_timer(conn);
4110         iscsit_stop_nopin_timer(conn);
4111
4112         if (conn->conn_transport->iscsit_wait_conn)
4113                 conn->conn_transport->iscsit_wait_conn(conn);
4114
4115         /*
4116          * During Connection recovery drop unacknowledged out of order
4117          * commands for this connection, and prepare the other commands
4118          * for reallegiance.
4119          *
4120          * During normal operation clear the out of order commands (but
4121          * do not free the struct iscsi_ooo_cmdsn's) and release all
4122          * struct iscsi_cmds.
4123          */
4124         if (atomic_read(&conn->connection_recovery)) {
4125                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4126                 iscsit_prepare_cmds_for_reallegiance(conn);
4127         } else {
4128                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4129                 iscsit_release_commands_from_conn(conn);
4130         }
4131         iscsit_free_queue_reqs_for_conn(conn);
4132
4133         /*
4134          * Handle decrementing session or connection usage count if
4135          * a logout response was not able to be sent because the
4136          * connection failed.  Fall back to Session Recovery here.
4137          */
4138         if (atomic_read(&conn->conn_logout_remove)) {
4139                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4140                         iscsit_dec_conn_usage_count(conn);
4141                         iscsit_dec_session_usage_count(sess);
4142                 }
4143                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4144                         iscsit_dec_conn_usage_count(conn);
4145
4146                 atomic_set(&conn->conn_logout_remove, 0);
4147                 atomic_set(&sess->session_reinstatement, 0);
4148                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4149         }
4150
4151         spin_lock_bh(&sess->conn_lock);
4152         list_del(&conn->conn_list);
4153
4154         /*
4155          * Attempt to let the Initiator know this connection failed by
4156          * sending an Connection Dropped Async Message on another
4157          * active connection.
4158          */
4159         if (atomic_read(&conn->connection_recovery))
4160                 iscsit_build_conn_drop_async_message(conn);
4161
4162         spin_unlock_bh(&sess->conn_lock);
4163
4164         /*
4165          * If connection reinstatement is being performed on this connection,
4166          * up the connection reinstatement semaphore that is being blocked on
4167          * in iscsit_cause_connection_reinstatement().
4168          */
4169         spin_lock_bh(&conn->state_lock);
4170         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4171                 spin_unlock_bh(&conn->state_lock);
4172                 complete(&conn->conn_wait_comp);
4173                 wait_for_completion(&conn->conn_post_wait_comp);
4174                 spin_lock_bh(&conn->state_lock);
4175         }
4176
4177         /*
4178          * If connection reinstatement is being performed on this connection
4179          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4180          * connection wait rcfr semaphore that is being blocked on
4181          * an iscsit_connection_reinstatement_rcfr().
4182          */
4183         if (atomic_read(&conn->connection_wait_rcfr)) {
4184                 spin_unlock_bh(&conn->state_lock);
4185                 complete(&conn->conn_wait_rcfr_comp);
4186                 wait_for_completion(&conn->conn_post_wait_comp);
4187                 spin_lock_bh(&conn->state_lock);
4188         }
4189         atomic_set(&conn->connection_reinstatement, 1);
4190         spin_unlock_bh(&conn->state_lock);
4191
4192         /*
4193          * If any other processes are accessing this connection pointer we
4194          * must wait until they have completed.
4195          */
4196         iscsit_check_conn_usage_count(conn);
4197
4198         ahash_request_free(conn->conn_tx_hash);
4199         if (conn->conn_rx_hash) {
4200                 struct crypto_ahash *tfm;
4201
4202                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4203                 ahash_request_free(conn->conn_rx_hash);
4204                 crypto_free_ahash(tfm);
4205         }
4206
4207         if (conn->sock)
4208                 sock_release(conn->sock);
4209
4210         if (conn->conn_transport->iscsit_free_conn)
4211                 conn->conn_transport->iscsit_free_conn(conn);
4212
4213         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4214         conn->conn_state = TARG_CONN_STATE_FREE;
4215         iscsit_free_conn(conn);
4216
4217         spin_lock_bh(&sess->conn_lock);
4218         atomic_dec(&sess->nconn);
4219         pr_debug("Decremented iSCSI connection count to %hu from node:"
4220                 " %s\n", atomic_read(&sess->nconn),
4221                 sess->sess_ops->InitiatorName);
4222         /*
4223          * Make sure that if one connection fails in an non ERL=2 iSCSI
4224          * Session that they all fail.
4225          */
4226         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4227              !atomic_read(&sess->session_logout))
4228                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4229
4230         /*
4231          * If this was not the last connection in the session, and we are
4232          * performing session reinstatement or falling back to ERL=0, call
4233          * iscsit_stop_session() without sleeping to shutdown the other
4234          * active connections.
4235          */
4236         if (atomic_read(&sess->nconn)) {
4237                 if (!atomic_read(&sess->session_reinstatement) &&
4238                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4239                         spin_unlock_bh(&sess->conn_lock);
4240                         return 0;
4241                 }
4242                 if (!atomic_read(&sess->session_stop_active)) {
4243                         atomic_set(&sess->session_stop_active, 1);
4244                         spin_unlock_bh(&sess->conn_lock);
4245                         iscsit_stop_session(sess, 0, 0);
4246                         return 0;
4247                 }
4248                 spin_unlock_bh(&sess->conn_lock);
4249                 return 0;
4250         }
4251
4252         /*
4253          * If this was the last connection in the session and one of the
4254          * following is occurring:
4255          *
4256          * Session Reinstatement is not being performed, and are falling back
4257          * to ERL=0 call iscsit_close_session().
4258          *
4259          * Session Logout was requested.  iscsit_close_session() will be called
4260          * elsewhere.
4261          *
4262          * Session Continuation is not being performed, start the Time2Retain
4263          * handler and check if sleep_on_sess_wait_sem is active.
4264          */
4265         if (!atomic_read(&sess->session_reinstatement) &&
4266              atomic_read(&sess->session_fall_back_to_erl0)) {
4267                 spin_unlock_bh(&sess->conn_lock);
4268                 iscsit_close_session(sess);
4269
4270                 return 0;
4271         } else if (atomic_read(&sess->session_logout)) {
4272                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4273                 sess->session_state = TARG_SESS_STATE_FREE;
4274                 spin_unlock_bh(&sess->conn_lock);
4275
4276                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4277                         complete(&sess->session_wait_comp);
4278
4279                 return 0;
4280         } else {
4281                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4282                 sess->session_state = TARG_SESS_STATE_FAILED;
4283
4284                 if (!atomic_read(&sess->session_continuation)) {
4285                         spin_unlock_bh(&sess->conn_lock);
4286                         iscsit_start_time2retain_handler(sess);
4287                 } else
4288                         spin_unlock_bh(&sess->conn_lock);
4289
4290                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4291                         complete(&sess->session_wait_comp);
4292
4293                 return 0;
4294         }
4295 }
4296
4297 /*
4298  * If the iSCSI Session for the iSCSI Initiator Node exists,
4299  * forcefully shutdown the iSCSI NEXUS.
4300  */
4301 int iscsit_close_session(struct iscsi_session *sess)
4302 {
4303         struct iscsi_portal_group *tpg = sess->tpg;
4304         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4305
4306         if (atomic_read(&sess->nconn)) {
4307                 pr_err("%d connection(s) still exist for iSCSI session"
4308                         " to %s\n", atomic_read(&sess->nconn),
4309                         sess->sess_ops->InitiatorName);
4310                 BUG();
4311         }
4312
4313         spin_lock_bh(&se_tpg->session_lock);
4314         atomic_set(&sess->session_logout, 1);
4315         atomic_set(&sess->session_reinstatement, 1);
4316         iscsit_stop_time2retain_timer(sess);
4317         spin_unlock_bh(&se_tpg->session_lock);
4318
4319         /*
4320          * transport_deregister_session_configfs() will clear the
4321          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4322          * can be setting it again with __transport_register_session() in
4323          * iscsi_post_login_handler() again after the iscsit_stop_session()
4324          * completes in iscsi_np context.
4325          */
4326         transport_deregister_session_configfs(sess->se_sess);
4327
4328         /*
4329          * If any other processes are accessing this session pointer we must
4330          * wait until they have completed.  If we are in an interrupt (the
4331          * time2retain handler) and contain and active session usage count we
4332          * restart the timer and exit.
4333          */
4334         if (!in_interrupt()) {
4335                 if (iscsit_check_session_usage_count(sess) == 1)
4336                         iscsit_stop_session(sess, 1, 1);
4337         } else {
4338                 if (iscsit_check_session_usage_count(sess) == 2) {
4339                         atomic_set(&sess->session_logout, 0);
4340                         iscsit_start_time2retain_handler(sess);
4341                         return 0;
4342                 }
4343         }
4344
4345         transport_deregister_session(sess->se_sess);
4346
4347         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4348                 iscsit_free_connection_recovery_entries(sess);
4349
4350         iscsit_free_all_ooo_cmdsns(sess);
4351
4352         spin_lock_bh(&se_tpg->session_lock);
4353         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4354         sess->session_state = TARG_SESS_STATE_FREE;
4355         pr_debug("Released iSCSI session from node: %s\n",
4356                         sess->sess_ops->InitiatorName);
4357         tpg->nsessions--;
4358         if (tpg->tpg_tiqn)
4359                 tpg->tpg_tiqn->tiqn_nsessions--;
4360
4361         pr_debug("Decremented number of active iSCSI Sessions on"
4362                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4363
4364         ida_free(&sess_ida, sess->session_index);
4365         kfree(sess->sess_ops);
4366         sess->sess_ops = NULL;
4367         spin_unlock_bh(&se_tpg->session_lock);
4368
4369         kfree(sess);
4370         return 0;
4371 }
4372
4373 static void iscsit_logout_post_handler_closesession(
4374         struct iscsi_conn *conn)
4375 {
4376         struct iscsi_session *sess = conn->sess;
4377         int sleep = 1;
4378         /*
4379          * Traditional iscsi/tcp will invoke this logic from TX thread
4380          * context during session logout, so clear tx_thread_active and
4381          * sleep if iscsit_close_connection() has not already occured.
4382          *
4383          * Since iser-target invokes this logic from it's own workqueue,
4384          * always sleep waiting for RX/TX thread shutdown to complete
4385          * within iscsit_close_connection().
4386          */
4387         if (!conn->conn_transport->rdma_shutdown) {
4388                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4389                 if (!sleep)
4390                         return;
4391         }
4392
4393         atomic_set(&conn->conn_logout_remove, 0);
4394         complete(&conn->conn_logout_comp);
4395
4396         iscsit_dec_conn_usage_count(conn);
4397         iscsit_stop_session(sess, sleep, sleep);
4398         iscsit_dec_session_usage_count(sess);
4399         iscsit_close_session(sess);
4400 }
4401
4402 static void iscsit_logout_post_handler_samecid(
4403         struct iscsi_conn *conn)
4404 {
4405         int sleep = 1;
4406
4407         if (!conn->conn_transport->rdma_shutdown) {
4408                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4409                 if (!sleep)
4410                         return;
4411         }
4412
4413         atomic_set(&conn->conn_logout_remove, 0);
4414         complete(&conn->conn_logout_comp);
4415
4416         iscsit_cause_connection_reinstatement(conn, sleep);
4417         iscsit_dec_conn_usage_count(conn);
4418 }
4419
4420 static void iscsit_logout_post_handler_diffcid(
4421         struct iscsi_conn *conn,
4422         u16 cid)
4423 {
4424         struct iscsi_conn *l_conn;
4425         struct iscsi_session *sess = conn->sess;
4426         bool conn_found = false;
4427
4428         if (!sess)
4429                 return;
4430
4431         spin_lock_bh(&sess->conn_lock);
4432         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4433                 if (l_conn->cid == cid) {
4434                         iscsit_inc_conn_usage_count(l_conn);
4435                         conn_found = true;
4436                         break;
4437                 }
4438         }
4439         spin_unlock_bh(&sess->conn_lock);
4440
4441         if (!conn_found)
4442                 return;
4443
4444         if (l_conn->sock)
4445                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4446
4447         spin_lock_bh(&l_conn->state_lock);
4448         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4449         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4450         spin_unlock_bh(&l_conn->state_lock);
4451
4452         iscsit_cause_connection_reinstatement(l_conn, 1);
4453         iscsit_dec_conn_usage_count(l_conn);
4454 }
4455
4456 /*
4457  *      Return of 0 causes the TX thread to restart.
4458  */
4459 int iscsit_logout_post_handler(
4460         struct iscsi_cmd *cmd,
4461         struct iscsi_conn *conn)
4462 {
4463         int ret = 0;
4464
4465         switch (cmd->logout_reason) {
4466         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4467                 switch (cmd->logout_response) {
4468                 case ISCSI_LOGOUT_SUCCESS:
4469                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4470                 default:
4471                         iscsit_logout_post_handler_closesession(conn);
4472                         break;
4473                 }
4474                 ret = 0;
4475                 break;
4476         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4477                 if (conn->cid == cmd->logout_cid) {
4478                         switch (cmd->logout_response) {
4479                         case ISCSI_LOGOUT_SUCCESS:
4480                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4481                         default:
4482                                 iscsit_logout_post_handler_samecid(conn);
4483                                 break;
4484                         }
4485                         ret = 0;
4486                 } else {
4487                         switch (cmd->logout_response) {
4488                         case ISCSI_LOGOUT_SUCCESS:
4489                                 iscsit_logout_post_handler_diffcid(conn,
4490                                         cmd->logout_cid);
4491                                 break;
4492                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4493                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4494                         default:
4495                                 break;
4496                         }
4497                         ret = 1;
4498                 }
4499                 break;
4500         case ISCSI_LOGOUT_REASON_RECOVERY:
4501                 switch (cmd->logout_response) {
4502                 case ISCSI_LOGOUT_SUCCESS:
4503                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4504                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4505                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4506                 default:
4507                         break;
4508                 }
4509                 ret = 1;
4510                 break;
4511         default:
4512                 break;
4513
4514         }
4515         return ret;
4516 }
4517 EXPORT_SYMBOL(iscsit_logout_post_handler);
4518
4519 void iscsit_fail_session(struct iscsi_session *sess)
4520 {
4521         struct iscsi_conn *conn;
4522
4523         spin_lock_bh(&sess->conn_lock);
4524         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4525                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4526                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4527         }
4528         spin_unlock_bh(&sess->conn_lock);
4529
4530         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4531         sess->session_state = TARG_SESS_STATE_FAILED;
4532 }
4533
4534 int iscsit_free_session(struct iscsi_session *sess)
4535 {
4536         u16 conn_count = atomic_read(&sess->nconn);
4537         struct iscsi_conn *conn, *conn_tmp = NULL;
4538         int is_last;
4539
4540         spin_lock_bh(&sess->conn_lock);
4541         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4542
4543         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4544                         conn_list) {
4545                 if (conn_count == 0)
4546                         break;
4547
4548                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4549                         is_last = 1;
4550                 } else {
4551                         iscsit_inc_conn_usage_count(conn_tmp);
4552                         is_last = 0;
4553                 }
4554                 iscsit_inc_conn_usage_count(conn);
4555
4556                 spin_unlock_bh(&sess->conn_lock);
4557                 iscsit_cause_connection_reinstatement(conn, 1);
4558                 spin_lock_bh(&sess->conn_lock);
4559
4560                 iscsit_dec_conn_usage_count(conn);
4561                 if (is_last == 0)
4562                         iscsit_dec_conn_usage_count(conn_tmp);
4563
4564                 conn_count--;
4565         }
4566
4567         if (atomic_read(&sess->nconn)) {
4568                 spin_unlock_bh(&sess->conn_lock);
4569                 wait_for_completion(&sess->session_wait_comp);
4570         } else
4571                 spin_unlock_bh(&sess->conn_lock);
4572
4573         iscsit_close_session(sess);
4574         return 0;
4575 }
4576
4577 void iscsit_stop_session(
4578         struct iscsi_session *sess,
4579         int session_sleep,
4580         int connection_sleep)
4581 {
4582         u16 conn_count = atomic_read(&sess->nconn);
4583         struct iscsi_conn *conn, *conn_tmp = NULL;
4584         int is_last;
4585
4586         spin_lock_bh(&sess->conn_lock);
4587         if (session_sleep)
4588                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4589
4590         if (connection_sleep) {
4591                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4592                                 conn_list) {
4593                         if (conn_count == 0)
4594                                 break;
4595
4596                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4597                                 is_last = 1;
4598                         } else {
4599                                 iscsit_inc_conn_usage_count(conn_tmp);
4600                                 is_last = 0;
4601                         }
4602                         iscsit_inc_conn_usage_count(conn);
4603
4604                         spin_unlock_bh(&sess->conn_lock);
4605                         iscsit_cause_connection_reinstatement(conn, 1);
4606                         spin_lock_bh(&sess->conn_lock);
4607
4608                         iscsit_dec_conn_usage_count(conn);
4609                         if (is_last == 0)
4610                                 iscsit_dec_conn_usage_count(conn_tmp);
4611                         conn_count--;
4612                 }
4613         } else {
4614                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4615                         iscsit_cause_connection_reinstatement(conn, 0);
4616         }
4617
4618         if (session_sleep && atomic_read(&sess->nconn)) {
4619                 spin_unlock_bh(&sess->conn_lock);
4620                 wait_for_completion(&sess->session_wait_comp);
4621         } else
4622                 spin_unlock_bh(&sess->conn_lock);
4623 }
4624
4625 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4626 {
4627         struct iscsi_session *sess;
4628         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4629         struct se_session *se_sess, *se_sess_tmp;
4630         LIST_HEAD(free_list);
4631         int session_count = 0;
4632
4633         spin_lock_bh(&se_tpg->session_lock);
4634         if (tpg->nsessions && !force) {
4635                 spin_unlock_bh(&se_tpg->session_lock);
4636                 return -1;
4637         }
4638
4639         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4640                         sess_list) {
4641                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4642
4643                 spin_lock(&sess->conn_lock);
4644                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4645                     atomic_read(&sess->session_logout) ||
4646                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4647                         spin_unlock(&sess->conn_lock);
4648                         continue;
4649                 }
4650                 atomic_set(&sess->session_reinstatement, 1);
4651                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4652                 spin_unlock(&sess->conn_lock);
4653
4654                 list_move_tail(&se_sess->sess_list, &free_list);
4655         }
4656         spin_unlock_bh(&se_tpg->session_lock);
4657
4658         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4659                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4660
4661                 iscsit_free_session(sess);
4662                 session_count++;
4663         }
4664
4665         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4666                         " Group: %hu\n", session_count, tpg->tpgt);
4667         return 0;
4668 }
4669
4670 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4671 MODULE_VERSION("4.1.x");
4672 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4673 MODULE_LICENSE("GPL");
4674
4675 module_init(iscsi_target_init_module);
4676 module_exit(iscsi_target_cleanup_module);