drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <crypto/hash.h>
  20 #include <linux/string.h>
  21 #include <linux/kthread.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <linux/delay.h>
  27 #include <linux/sched/signal.h>
  28 #include <asm/unaligned.h>
  29 #include <linux/inet.h>
  30 #include <net/ipv6.h>
  31 #include <scsi/scsi_proto.h>
  32 #include <scsi/iscsi_proto.h>
  33 #include <scsi/scsi_tcq.h>
  34 #include <target/target_core_base.h>
  35 #include <target/target_core_fabric.h>
  36
  37 #include <target/iscsi/iscsi_target_core.h>
  38 #include "iscsi_target_parameters.h"
  39 #include "iscsi_target_seq_pdu_list.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include <target/iscsi/iscsi_target_stat.h>
  51
  52 #include <target/iscsi/iscsi_transport.h>
  53
  54 static LIST_HEAD(g_tiqn_list);
  55 static LIST_HEAD(g_np_list);
  56 static DEFINE_SPINLOCK(tiqn_lock);
  57 static DEFINE_MUTEX(np_lock);
  58
  59 static struct idr tiqn_idr;
  60 DEFINE_IDA(sess_ida);
  61 struct mutex auth_id_lock;
  62
  63 struct iscsit_global *iscsit_global;
  64
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         struct iscsi_scsi_req *, u32);
  72
  73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  74 {
  75         struct iscsi_tiqn *tiqn = NULL;
  76
  77         spin_lock(&tiqn_lock);
  78         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  79                 if (!strcmp(tiqn->tiqn, buf)) {
  80
  81                         spin_lock(&tiqn->tiqn_state_lock);
  82                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  83                                 tiqn->tiqn_access_count++;
  84                                 spin_unlock(&tiqn->tiqn_state_lock);
  85                                 spin_unlock(&tiqn_lock);
  86                                 return tiqn;
  87                         }
  88                         spin_unlock(&tiqn->tiqn_state_lock);
  89                 }
  90         }
  91         spin_unlock(&tiqn_lock);
  92
  93         return NULL;
  94 }
  95
  96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  97 {
  98         spin_lock(&tiqn->tiqn_state_lock);
  99         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 100                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 101                 spin_unlock(&tiqn->tiqn_state_lock);
 102                 return 0;
 103         }
 104         spin_unlock(&tiqn->tiqn_state_lock);
 105
 106         return -1;
 107 }
 108
 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 110 {
 111         spin_lock(&tiqn->tiqn_state_lock);
 112         tiqn->tiqn_access_count--;
 113         spin_unlock(&tiqn->tiqn_state_lock);
 114 }
 115
 116 /*
 117  * Note that IQN formatting is expected to be done in userspace, and
 118  * no explict IQN format checks are done here.
 119  */
 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 121 {
 122         struct iscsi_tiqn *tiqn = NULL;
 123         int ret;
 124
 125         if (strlen(buf) >= ISCSI_IQN_LEN) {
 126                 pr_err("Target IQN exceeds %d bytes\n",
 127                                 ISCSI_IQN_LEN);
 128                 return ERR_PTR(-EINVAL);
 129         }
 130
 131         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 132         if (!tiqn)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 145
 146         idr_preload(GFP_KERNEL);
 147         spin_lock(&tiqn_lock);
 148
 149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 150         if (ret < 0) {
 151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 152                 spin_unlock(&tiqn_lock);
 153                 idr_preload_end();
 154                 kfree(tiqn);
 155                 return ERR_PTR(ret);
 156         }
 157         tiqn->tiqn_index = ret;
 158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 159
 160         spin_unlock(&tiqn_lock);
 161         idr_preload_end();
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         spin_unlock_bh(&np->np_thread_lock);
 220         /*
 221          * Determine if the portal group is accepting storage traffic.
 222          */
 223         spin_lock_bh(&tpg->tpg_state_lock);
 224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 225                 spin_unlock_bh(&tpg->tpg_state_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&tpg->tpg_state_lock);
 229
 230         /*
 231          * Here we serialize access across the TIQN+TPG Tuple.
 232          */
 233         ret = down_interruptible(&tpg->np_login_sem);
 234         if (ret != 0)
 235                 return -1;
 236
 237         spin_lock_bh(&tpg->tpg_state_lock);
 238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 239                 spin_unlock_bh(&tpg->tpg_state_lock);
 240                 up(&tpg->np_login_sem);
 241                 return -1;
 242         }
 243         spin_unlock_bh(&tpg->tpg_state_lock);
 244
 245         return 0;
 246 }
 247
 248 void iscsit_login_kref_put(struct kref *kref)
 249 {
 250         struct iscsi_tpg_np *tpg_np = container_of(kref,
 251                                 struct iscsi_tpg_np, tpg_np_kref);
 252
 253         complete(&tpg_np->tpg_np_comp);
 254 }
 255
 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 257                        struct iscsi_tpg_np *tpg_np)
 258 {
 259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 260
 261         up(&tpg->np_login_sem);
 262
 263         if (tpg_np)
 264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 265
 266         if (tiqn)
 267                 iscsit_put_tiqn_for_login(tiqn);
 268
 269         return 0;
 270 }
 271
 272 bool iscsit_check_np_match(
 273         struct sockaddr_storage *sockaddr,
 274         struct iscsi_np *np,
 275         int network_transport)
 276 {
 277         struct sockaddr_in *sock_in, *sock_in_e;
 278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 279         bool ip_match = false;
 280         u16 port, port_e;
 281
 282         if (sockaddr->ss_family == AF_INET6) {
 283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                             &sock_in6_e->sin6_addr.in6_u,
 288                             sizeof(struct in6_addr)))
 289                         ip_match = true;
 290
 291                 port = ntohs(sock_in6->sin6_port);
 292                 port_e = ntohs(sock_in6_e->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301                 port_e = ntohs(sock_in_e->sin_port);
 302         }
 303
 304         if (ip_match && (port_e == port) &&
 305             (np->np_network_transport == network_transport))
 306                 return true;
 307
 308         return false;
 309 }
 310
 311 /*
 312  * Called with mutex np_lock held
 313  */
 314 static struct iscsi_np *iscsit_get_np(
 315         struct sockaddr_storage *sockaddr,
 316         int network_transport)
 317 {
 318         struct iscsi_np *np;
 319         bool match;
 320
 321         list_for_each_entry(np, &g_np_list, np_list) {
 322                 spin_lock_bh(&np->np_thread_lock);
 323                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 324                         spin_unlock_bh(&np->np_thread_lock);
 325                         continue;
 326                 }
 327
 328                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 329                 if (match) {
 330                         /*
 331                          * Increment the np_exports reference count now to
 332                          * prevent iscsit_del_np() below from being called
 333                          * while iscsi_tpg_add_network_portal() is called.
 334                          */
 335                         np->np_exports++;
 336                         spin_unlock_bh(&np->np_thread_lock);
 337                         return np;
 338                 }
 339                 spin_unlock_bh(&np->np_thread_lock);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 struct iscsi_np *iscsit_add_np(
 346         struct sockaddr_storage *sockaddr,
 347         int network_transport)
 348 {
 349         struct iscsi_np *np;
 350         int ret;
 351
 352         mutex_lock(&np_lock);
 353
 354         /*
 355          * Locate the existing struct iscsi_np if already active..
 356          */
 357         np = iscsit_get_np(sockaddr, network_transport);
 358         if (np) {
 359                 mutex_unlock(&np_lock);
 360                 return np;
 361         }
 362
 363         np = kzalloc(sizeof(*np), GFP_KERNEL);
 364         if (!np) {
 365                 mutex_unlock(&np_lock);
 366                 return ERR_PTR(-ENOMEM);
 367         }
 368
 369         np->np_flags |= NPF_IP_NETWORK;
 370         np->np_network_transport = network_transport;
 371         spin_lock_init(&np->np_thread_lock);
 372         init_completion(&np->np_restart_comp);
 373         INIT_LIST_HEAD(&np->np_list);
 374
 375         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 376
 377         ret = iscsi_target_setup_login_socket(np, sockaddr);
 378         if (ret != 0) {
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 mutex_unlock(&np_lock);
 390                 return ERR_PTR(ret);
 391         }
 392         /*
 393          * Increment the np_exports reference count now to prevent
 394          * iscsit_del_np() below from being run while a new call to
 395          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 396          * active.  We don't need to hold np->np_thread_lock at this
 397          * point because iscsi_np has not been added to g_np_list yet.
 398          */
 399         np->np_exports = 1;
 400         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 401
 402         list_add_tail(&np->np_list, &g_np_list);
 403         mutex_unlock(&np_lock);
 404
 405         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 406                 &np->np_sockaddr, np->np_transport->name);
 407
 408         return np;
 409 }
 410
 411 int iscsit_reset_np_thread(
 412         struct iscsi_np *np,
 413         struct iscsi_tpg_np *tpg_np,
 414         struct iscsi_portal_group *tpg,
 415         bool shutdown)
 416 {
 417         spin_lock_bh(&np->np_thread_lock);
 418         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 419                 spin_unlock_bh(&np->np_thread_lock);
 420                 return 0;
 421         }
 422         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 423         atomic_inc(&np->np_reset_count);
 424
 425         if (np->np_thread) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 send_sig(SIGINT, np->np_thread, 1);
 428                 wait_for_completion(&np->np_restart_comp);
 429                 spin_lock_bh(&np->np_thread_lock);
 430         }
 431         spin_unlock_bh(&np->np_thread_lock);
 432
 433         if (tpg_np && shutdown) {
 434                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 435
 436                 wait_for_completion(&tpg_np->tpg_np_comp);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static void iscsit_free_np(struct iscsi_np *np)
 443 {
 444         if (np->np_socket)
 445                 sock_release(np->np_socket);
 446 }
 447
 448 int iscsit_del_np(struct iscsi_np *np)
 449 {
 450         spin_lock_bh(&np->np_thread_lock);
 451         np->np_exports--;
 452         if (np->np_exports) {
 453                 np->enabled = true;
 454                 spin_unlock_bh(&np->np_thread_lock);
 455                 return 0;
 456         }
 457         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 458         spin_unlock_bh(&np->np_thread_lock);
 459
 460         if (np->np_thread) {
 461                 /*
 462                  * We need to send the signal to wakeup Linux/Net
 463                  * which may be sleeping in sock_accept()..
 464                  */
 465                 send_sig(SIGINT, np->np_thread, 1);
 466                 kthread_stop(np->np_thread);
 467                 np->np_thread = NULL;
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         mutex_lock(&np_lock);
 473         list_del(&np->np_list);
 474         mutex_unlock(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 477                 &np->np_sockaddr, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 485
 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 487 {
 488         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 489 }
 490 EXPORT_SYMBOL(iscsit_queue_rsp);
 491
 492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 493 {
 494         spin_lock_bh(&conn->cmd_lock);
 495         if (!list_empty(&cmd->i_conn_node) &&
 496             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 497                 list_del_init(&cmd->i_conn_node);
 498         spin_unlock_bh(&conn->cmd_lock);
 499
 500         __iscsit_free_cmd(cmd, true);
 501 }
 502 EXPORT_SYMBOL(iscsit_aborted_task);
 503
 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 505                                       u32, u32, const void *, void *);
 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 507
 508 static int
 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 510                           const void *data_buf, u32 data_buf_len)
 511 {
 512         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 513         struct kvec *iov;
 514         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 515         int ret;
 516
 517         iov = &cmd->iov_misc[0];
 518         iov[niov].iov_base      = cmd->pdu;
 519         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 520
 521         if (conn->conn_ops->HeaderDigest) {
 522                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 523
 524                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 525                                           ISCSI_HDR_LEN, 0, NULL,
 526                                           header_digest);
 527
 528                 iov[0].iov_len += ISCSI_CRC_LEN;
 529                 tx_size += ISCSI_CRC_LEN;
 530                 pr_debug("Attaching CRC32C HeaderDigest"
 531                          " to opcode 0x%x 0x%08x\n",
 532                          hdr->opcode, *header_digest);
 533         }
 534
 535         if (data_buf_len) {
 536                 u32 padding = ((-data_buf_len) & 3);
 537
 538                 iov[niov].iov_base      = (void *)data_buf;
 539                 iov[niov++].iov_len     = data_buf_len;
 540                 tx_size += data_buf_len;
 541
 542                 if (padding != 0) {
 543                         iov[niov].iov_base = &cmd->pad_bytes;
 544                         iov[niov++].iov_len = padding;
 545                         tx_size += padding;
 546                         pr_debug("Attaching %u additional"
 547                                  " padding bytes.\n", padding);
 548                 }
 549
 550                 if (conn->conn_ops->DataDigest) {
 551                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 552                                                   data_buf, data_buf_len,
 553                                                   padding, &cmd->pad_bytes,
 554                                                   &cmd->data_crc);
 555
 556                         iov[niov].iov_base = &cmd->data_crc;
 557                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 558                         tx_size += ISCSI_CRC_LEN;
 559                         pr_debug("Attached DataDigest for %u"
 560                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 561                                  data_buf_len, hdr->opcode, cmd->data_crc);
 562                 }
 563         }
 564
 565         cmd->iov_misc_count = niov;
 566         cmd->tx_size = tx_size;
 567
 568         ret = iscsit_send_tx_data(cmd, conn, 1);
 569         if (ret < 0) {
 570                 iscsit_tx_thread_wait_for_tcp(conn);
 571                 return ret;
 572         }
 573
 574         return 0;
 575 }
 576
 577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 580                                     u32, u32, u32, u8 *);
 581 static int
 582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 583                        const struct iscsi_datain *datain)
 584 {
 585         struct kvec *iov;
 586         u32 iov_count = 0, tx_size = 0;
 587         int ret, iov_ret;
 588
 589         iov = &cmd->iov_data[0];
 590         iov[iov_count].iov_base = cmd->pdu;
 591         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 592         tx_size += ISCSI_HDR_LEN;
 593
 594         if (conn->conn_ops->HeaderDigest) {
 595                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 596
 597                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 598                                           ISCSI_HDR_LEN, 0, NULL,
 599                                           header_digest);
 600
 601                 iov[0].iov_len += ISCSI_CRC_LEN;
 602                 tx_size += ISCSI_CRC_LEN;
 603
 604                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 605                          *header_digest);
 606         }
 607
 608         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 609                                    datain->offset, datain->length);
 610         if (iov_ret < 0)
 611                 return -1;
 612
 613         iov_count += iov_ret;
 614         tx_size += datain->length;
 615
 616         cmd->padding = ((-datain->length) & 3);
 617         if (cmd->padding) {
 618                 iov[iov_count].iov_base         = cmd->pad_bytes;
 619                 iov[iov_count++].iov_len        = cmd->padding;
 620                 tx_size += cmd->padding;
 621
 622                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 623         }
 624
 625         if (conn->conn_ops->DataDigest) {
 626                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 627                                                          cmd, datain->offset,
 628                                                          datain->length,
 629                                                          cmd->padding,
 630                                                          cmd->pad_bytes);
 631
 632                 iov[iov_count].iov_base = &cmd->data_crc;
 633                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 634                 tx_size += ISCSI_CRC_LEN;
 635
 636                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 637                          datain->length + cmd->padding, cmd->data_crc);
 638         }
 639
 640         cmd->iov_data_count = iov_count;
 641         cmd->tx_size = tx_size;
 642
 643         ret = iscsit_fe_sendpage_sg(cmd, conn);
 644
 645         iscsit_unmap_iovec(cmd);
 646
 647         if (ret < 0) {
 648                 iscsit_tx_thread_wait_for_tcp(conn);
 649                 return ret;
 650         }
 651
 652         return 0;
 653 }
 654
 655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 656                            struct iscsi_datain_req *dr, const void *buf,
 657                            u32 buf_len)
 658 {
 659         if (dr)
 660                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 661         else
 662                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 663 }
 664
 665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 666 {
 667         return TARGET_PROT_NORMAL;
 668 }
 669
 670 static struct iscsit_transport iscsi_target_transport = {
 671         .name                   = "iSCSI/TCP",
 672         .transport_type         = ISCSI_TCP,
 673         .rdma_shutdown          = false,
 674         .owner                  = NULL,
 675         .iscsit_setup_np        = iscsit_setup_np,
 676         .iscsit_accept_np       = iscsit_accept_np,
 677         .iscsit_free_np         = iscsit_free_np,
 678         .iscsit_get_login_rx    = iscsit_get_login_rx,
 679         .iscsit_put_login_tx    = iscsit_put_login_tx,
 680         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 681         .iscsit_immediate_queue = iscsit_immediate_queue,
 682         .iscsit_response_queue  = iscsit_response_queue,
 683         .iscsit_queue_data_in   = iscsit_queue_rsp,
 684         .iscsit_queue_status    = iscsit_queue_rsp,
 685         .iscsit_aborted_task    = iscsit_aborted_task,
 686         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 687         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 688         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 689 };
 690
 691 static int __init iscsi_target_init_module(void)
 692 {
 693         int ret = 0, size;
 694
 695         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 696         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 697         if (!iscsit_global)
 698                 return -1;
 699
 700         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 701         mutex_init(&auth_id_lock);
 702         idr_init(&tiqn_idr);
 703
 704         ret = target_register_template(&iscsi_ops);
 705         if (ret)
 706                 goto out;
 707
 708         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 709         iscsit_global->ts_bitmap = vzalloc(size);
 710         if (!iscsit_global->ts_bitmap)
 711                 goto configfs_out;
 712
 713         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 714                         sizeof(struct iscsi_queue_req),
 715                         __alignof__(struct iscsi_queue_req), 0, NULL);
 716         if (!lio_qr_cache) {
 717                 pr_err("Unable to kmem_cache_create() for"
 718                                 " lio_qr_cache\n");
 719                 goto bitmap_out;
 720         }
 721
 722         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 723                         sizeof(struct iscsi_datain_req),
 724                         __alignof__(struct iscsi_datain_req), 0, NULL);
 725         if (!lio_dr_cache) {
 726                 pr_err("Unable to kmem_cache_create() for"
 727                                 " lio_dr_cache\n");
 728                 goto qr_out;
 729         }
 730
 731         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 732                         sizeof(struct iscsi_ooo_cmdsn),
 733                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 734         if (!lio_ooo_cache) {
 735                 pr_err("Unable to kmem_cache_create() for"
 736                                 " lio_ooo_cache\n");
 737                 goto dr_out;
 738         }
 739
 740         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 741                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 742                         0, NULL);
 743         if (!lio_r2t_cache) {
 744                 pr_err("Unable to kmem_cache_create() for"
 745                                 " lio_r2t_cache\n");
 746                 goto ooo_out;
 747         }
 748
 749         iscsit_register_transport(&iscsi_target_transport);
 750
 751         if (iscsit_load_discovery_tpg() < 0)
 752                 goto r2t_out;
 753
 754         return ret;
 755 r2t_out:
 756         iscsit_unregister_transport(&iscsi_target_transport);
 757         kmem_cache_destroy(lio_r2t_cache);
 758 ooo_out:
 759         kmem_cache_destroy(lio_ooo_cache);
 760 dr_out:
 761         kmem_cache_destroy(lio_dr_cache);
 762 qr_out:
 763         kmem_cache_destroy(lio_qr_cache);
 764 bitmap_out:
 765         vfree(iscsit_global->ts_bitmap);
 766 configfs_out:
 767         /* XXX: this probably wants it to be it's own unwind step.. */
 768         if (iscsit_global->discovery_tpg)
 769                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 770         target_unregister_template(&iscsi_ops);
 771 out:
 772         kfree(iscsit_global);
 773         return -ENOMEM;
 774 }
 775
 776 static void __exit iscsi_target_cleanup_module(void)
 777 {
 778         iscsit_release_discovery_tpg();
 779         iscsit_unregister_transport(&iscsi_target_transport);
 780         kmem_cache_destroy(lio_qr_cache);
 781         kmem_cache_destroy(lio_dr_cache);
 782         kmem_cache_destroy(lio_ooo_cache);
 783         kmem_cache_destroy(lio_r2t_cache);
 784
 785         /*
 786          * Shutdown discovery sessions and disable discovery TPG
 787          */
 788         if (iscsit_global->discovery_tpg)
 789                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 790
 791         target_unregister_template(&iscsi_ops);
 792
 793         vfree(iscsit_global->ts_bitmap);
 794         kfree(iscsit_global);
 795 }
 796
 797 int iscsit_add_reject(
 798         struct iscsi_conn *conn,
 799         u8 reason,
 800         unsigned char *buf)
 801 {
 802         struct iscsi_cmd *cmd;
 803
 804         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 805         if (!cmd)
 806                 return -1;
 807
 808         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 809         cmd->reject_reason = reason;
 810
 811         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 812         if (!cmd->buf_ptr) {
 813                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 814                 iscsit_free_cmd(cmd, false);
 815                 return -1;
 816         }
 817
 818         spin_lock_bh(&conn->cmd_lock);
 819         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 820         spin_unlock_bh(&conn->cmd_lock);
 821
 822         cmd->i_state = ISTATE_SEND_REJECT;
 823         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 824
 825         return -1;
 826 }
 827 EXPORT_SYMBOL(iscsit_add_reject);
 828
 829 static int iscsit_add_reject_from_cmd(
 830         struct iscsi_cmd *cmd,
 831         u8 reason,
 832         bool add_to_conn,
 833         unsigned char *buf)
 834 {
 835         struct iscsi_conn *conn;
 836         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 837
 838         if (!cmd->conn) {
 839                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 840                                 cmd->init_task_tag);
 841                 return -1;
 842         }
 843         conn = cmd->conn;
 844
 845         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 846         cmd->reject_reason = reason;
 847
 848         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 849         if (!cmd->buf_ptr) {
 850                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 851                 iscsit_free_cmd(cmd, false);
 852                 return -1;
 853         }
 854
 855         if (add_to_conn) {
 856                 spin_lock_bh(&conn->cmd_lock);
 857                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 858                 spin_unlock_bh(&conn->cmd_lock);
 859         }
 860
 861         cmd->i_state = ISTATE_SEND_REJECT;
 862         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 863         /*
 864          * Perform the kref_put now if se_cmd has already been setup by
 865          * scsit_setup_scsi_cmd()
 866          */
 867         if (do_put) {
 868                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 869                 target_put_sess_cmd(&cmd->se_cmd);
 870         }
 871         return -1;
 872 }
 873
 874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 875                                  unsigned char *buf)
 876 {
 877         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 878 }
 879
 880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 881 {
 882         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 883 }
 884 EXPORT_SYMBOL(iscsit_reject_cmd);
 885
 886 /*
 887  * Map some portion of the allocated scatterlist to an iovec, suitable for
 888  * kernel sockets to copy data in/out.
 889  */
 890 static int iscsit_map_iovec(
 891         struct iscsi_cmd *cmd,
 892         struct kvec *iov,
 893         u32 data_offset,
 894         u32 data_length)
 895 {
 896         u32 i = 0;
 897         struct scatterlist *sg;
 898         unsigned int page_off;
 899
 900         /*
 901          * We know each entry in t_data_sg contains a page.
 902          */
 903         u32 ent = data_offset / PAGE_SIZE;
 904
 905         if (ent >= cmd->se_cmd.t_data_nents) {
 906                 pr_err("Initial page entry out-of-bounds\n");
 907                 return -1;
 908         }
 909
 910         sg = &cmd->se_cmd.t_data_sg[ent];
 911         page_off = (data_offset % PAGE_SIZE);
 912
 913         cmd->first_data_sg = sg;
 914         cmd->first_data_sg_off = page_off;
 915
 916         while (data_length) {
 917                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 918
 919                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 920                 iov[i].iov_len = cur_len;
 921
 922                 data_length -= cur_len;
 923                 page_off = 0;
 924                 sg = sg_next(sg);
 925                 i++;
 926         }
 927
 928         cmd->kmapped_nents = i;
 929
 930         return i;
 931 }
 932
 933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 934 {
 935         u32 i;
 936         struct scatterlist *sg;
 937
 938         sg = cmd->first_data_sg;
 939
 940         for (i = 0; i < cmd->kmapped_nents; i++)
 941                 kunmap(sg_page(&sg[i]));
 942 }
 943
 944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 945 {
 946         LIST_HEAD(ack_list);
 947         struct iscsi_cmd *cmd, *cmd_p;
 948
 949         conn->exp_statsn = exp_statsn;
 950
 951         if (conn->sess->sess_ops->RDMAExtensions)
 952                 return;
 953
 954         spin_lock_bh(&conn->cmd_lock);
 955         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 956                 spin_lock(&cmd->istate_lock);
 957                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 958                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 959                         cmd->i_state = ISTATE_REMOVE;
 960                         spin_unlock(&cmd->istate_lock);
 961                         list_move_tail(&cmd->i_conn_node, &ack_list);
 962                         continue;
 963                 }
 964                 spin_unlock(&cmd->istate_lock);
 965         }
 966         spin_unlock_bh(&conn->cmd_lock);
 967
 968         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 969                 list_del_init(&cmd->i_conn_node);
 970                 iscsit_free_cmd(cmd, false);
 971         }
 972 }
 973
 974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 975 {
 976         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 977
 978         iov_count += ISCSI_IOV_DATA_BUFFER;
 979         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 980         if (!cmd->iov_data)
 981                 return -ENOMEM;
 982
 983         cmd->orig_iov_data_count = iov_count;
 984         return 0;
 985 }
 986
 987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 988                           unsigned char *buf)
 989 {
 990         int data_direction, payload_length;
 991         struct iscsi_scsi_req *hdr;
 992         int iscsi_task_attr;
 993         int sam_task_attr;
 994
 995         atomic_long_inc(&conn->sess->cmd_pdus);
 996
 997         hdr                     = (struct iscsi_scsi_req *) buf;
 998         payload_length          = ntoh24(hdr->dlength);
 999
1000         /* FIXME; Add checks for AdditionalHeaderSegment */
1001
1002         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005                                 " not set. Bad iSCSI Initiator.\n");
1006                 return iscsit_add_reject_cmd(cmd,
1007                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1008         }
1009
1010         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1012                 /*
1013                  * From RFC-3720 Section 10.3.1:
1014                  *
1015                  * "Either or both of R and W MAY be 1 when either the
1016                  *  Expected Data Transfer Length and/or Bidirectional Read
1017                  *  Expected Data Transfer Length are 0"
1018                  *
1019                  * For this case, go ahead and clear the unnecssary bits
1020                  * to avoid any confusion with ->data_direction.
1021                  */
1022                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1024
1025                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026                         " set when Expected Data Transfer Length is 0 for"
1027                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1028         }
1029
1030         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033                         " MUST be set if Expected Data Transfer Length is not 0."
1034                         " Bad iSCSI Initiator\n");
1035                 return iscsit_add_reject_cmd(cmd,
1036                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1037         }
1038
1039         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041                 pr_err("Bidirectional operations not supported!\n");
1042                 return iscsit_add_reject_cmd(cmd,
1043                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1044         }
1045
1046         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048                                 " Scsi Command PDU.\n");
1049                 return iscsit_add_reject_cmd(cmd,
1050                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1051         }
1052
1053         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055                         " protocol error.\n", payload_length);
1056                 return iscsit_add_reject_cmd(cmd,
1057                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1058         }
1059
1060         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062                 pr_err("Expected Data Transfer Length and Length of"
1063                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064                         " bit is not set protocol error\n");
1065                 return iscsit_add_reject_cmd(cmd,
1066                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1067         }
1068
1069         if (payload_length > be32_to_cpu(hdr->data_length)) {
1070                 pr_err("DataSegmentLength: %u is greater than"
1071                         " EDTL: %u, protocol error.\n", payload_length,
1072                                 hdr->data_length);
1073                 return iscsit_add_reject_cmd(cmd,
1074                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1075         }
1076
1077         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078                 pr_err("DataSegmentLength: %u is greater than"
1079                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081                 return iscsit_add_reject_cmd(cmd,
1082                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1083         }
1084
1085         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086                 pr_err("DataSegmentLength: %u is greater than"
1087                         " FirstBurstLength: %u, protocol error.\n",
1088                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1089                 return iscsit_add_reject_cmd(cmd,
1090                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1091         }
1092
1093         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1095                           DMA_NONE;
1096
1097         cmd->data_direction = data_direction;
1098         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1099         /*
1100          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101          */
1102         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104                 sam_task_attr = TCM_SIMPLE_TAG;
1105         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106                 sam_task_attr = TCM_ORDERED_TAG;
1107         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108                 sam_task_attr = TCM_HEAD_TAG;
1109         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110                 sam_task_attr = TCM_ACA_TAG;
1111         else {
1112                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114                 sam_task_attr = TCM_SIMPLE_TAG;
1115         }
1116
1117         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1118         cmd->i_state            = ISTATE_NEW_CMD;
1119         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120         cmd->immediate_data     = (payload_length) ? 1 : 0;
1121         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123         if (cmd->unsolicited_data)
1124                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1125
1126         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1129         else
1130                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1132         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1133         cmd->first_burst_len    = payload_length;
1134
1135         if (!conn->sess->sess_ops->RDMAExtensions &&
1136              cmd->data_direction == DMA_FROM_DEVICE) {
1137                 struct iscsi_datain_req *dr;
1138
1139                 dr = iscsit_allocate_datain_req();
1140                 if (!dr)
1141                         return iscsit_add_reject_cmd(cmd,
1142                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1143
1144                 iscsit_attach_datain_req(cmd, dr);
1145         }
1146
1147         /*
1148          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149          */
1150         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152                         cmd->data_direction, sam_task_attr,
1153                         cmd->sense_buffer + 2);
1154
1155         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1158                 conn->cid);
1159
1160         target_get_sess_cmd(&cmd->se_cmd, true);
1161
1162         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163                                                      scsilun_to_int(&hdr->lun));
1164         if (cmd->sense_reason)
1165                 goto attach_cmd;
1166
1167         /* only used for printks or comparing with ->ref_task_tag */
1168         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170         if (cmd->sense_reason) {
1171                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172                         return iscsit_add_reject_cmd(cmd,
1173                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174                 }
1175
1176                 goto attach_cmd;
1177         }
1178
1179         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180                 return iscsit_add_reject_cmd(cmd,
1181                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182         }
1183
1184 attach_cmd:
1185         spin_lock_bh(&conn->cmd_lock);
1186         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187         spin_unlock_bh(&conn->cmd_lock);
1188         /*
1189          * Check if we need to delay processing because of ALUA
1190          * Active/NonOptimized primary access state..
1191          */
1192         core_alua_check_nonop_delay(&cmd->se_cmd);
1193
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1197
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1199 {
1200         iscsit_set_dataout_sequence_values(cmd);
1201
1202         spin_lock_bh(&cmd->dataout_timeout_lock);
1203         iscsit_start_dataout_timer(cmd, cmd->conn);
1204         spin_unlock_bh(&cmd->dataout_timeout_lock);
1205 }
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1207
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209                             struct iscsi_scsi_req *hdr)
1210 {
1211         int cmdsn_ret = 0;
1212         /*
1213          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214          * the Immediate Bit is not set, and no Immediate
1215          * Data is attached.
1216          *
1217          * A PDU/CmdSN carrying Immediate Data can only
1218          * be processed after the DataCRC has passed.
1219          * If the DataCRC fails, the CmdSN MUST NOT
1220          * be acknowledged. (See below)
1221          */
1222         if (!cmd->immediate_data) {
1223                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224                                         (unsigned char *)hdr, hdr->cmdsn);
1225                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1226                         return -1;
1227                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228                         target_put_sess_cmd(&cmd->se_cmd);
1229                         return 0;
1230                 }
1231         }
1232
1233         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1234
1235         /*
1236          * If no Immediate Data is attached, it's OK to return now.
1237          */
1238         if (!cmd->immediate_data) {
1239                 if (!cmd->sense_reason && cmd->unsolicited_data)
1240                         iscsit_set_unsoliticed_dataout(cmd);
1241                 if (!cmd->sense_reason)
1242                         return 0;
1243
1244                 target_put_sess_cmd(&cmd->se_cmd);
1245                 return 0;
1246         }
1247
1248         /*
1249          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250          * execution.  These exceptions are processed in CmdSN order using
1251          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252          */
1253         if (cmd->sense_reason)
1254                 return 1;
1255         /*
1256          * Call directly into transport_generic_new_cmd() to perform
1257          * the backend memory allocation.
1258          */
1259         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260         if (cmd->sense_reason)
1261                 return 1;
1262
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1266
1267 static int
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1269                           bool dump_payload)
1270 {
1271         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1272         /*
1273          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1274          */
1275         if (dump_payload)
1276                 goto after_immediate_data;
1277         /*
1278          * Check for underflow case where both EDTL and immediate data payload
1279          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280          * already been set in target_cmd_size_check() as se_cmd->data_length.
1281          *
1282          * For this special case, fail the command and dump the immediate data
1283          * payload.
1284          */
1285         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287                 goto after_immediate_data;
1288         }
1289
1290         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291                                         cmd->first_burst_len);
1292 after_immediate_data:
1293         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294                 /*
1295                  * A PDU/CmdSN carrying Immediate Data passed
1296                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297                  * Immediate Bit is not set.
1298                  */
1299                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300                                         (unsigned char *)hdr, hdr->cmdsn);
1301                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302                         return -1;
1303
1304                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305                         int rc;
1306
1307                         rc = iscsit_dump_data_payload(cmd->conn,
1308                                                       cmd->first_burst_len, 1);
1309                         target_put_sess_cmd(&cmd->se_cmd);
1310                         return rc;
1311                 } else if (cmd->unsolicited_data)
1312                         iscsit_set_unsoliticed_dataout(cmd);
1313
1314         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315                 /*
1316                  * Immediate Data failed DataCRC and ERL>=1,
1317                  * silently drop this PDU and let the initiator
1318                  * plug the CmdSN gap.
1319                  *
1320                  * FIXME: Send Unsolicited NOPIN with reserved
1321                  * TTT here to help the initiator figure out
1322                  * the missing CmdSN, although they should be
1323                  * intelligent enough to determine the missing
1324                  * CmdSN and issue a retry to plug the sequence.
1325                  */
1326                 cmd->i_state = ISTATE_REMOVE;
1327                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329                 return -1;
1330
1331         return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336                            unsigned char *buf)
1337 {
1338         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339         int rc, immed_data;
1340         bool dump_payload = false;
1341
1342         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343         if (rc < 0)
1344                 return 0;
1345         /*
1346          * Allocation iovecs needed for struct socket operations for
1347          * traditional iSCSI block I/O.
1348          */
1349         if (iscsit_allocate_iovecs(cmd) < 0) {
1350                 return iscsit_reject_cmd(cmd,
1351                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352         }
1353         immed_data = cmd->immediate_data;
1354
1355         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356         if (rc < 0)
1357                 return rc;
1358         else if (rc > 0)
1359                 dump_payload = true;
1360
1361         if (!immed_data)
1362                 return 0;
1363
1364         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368         struct ahash_request *hash,
1369         struct iscsi_cmd *cmd,
1370         u32 data_offset,
1371         u32 data_length,
1372         u32 padding,
1373         u8 *pad_bytes)
1374 {
1375         u32 data_crc;
1376         struct scatterlist *sg;
1377         unsigned int page_off;
1378
1379         crypto_ahash_init(hash);
1380
1381         sg = cmd->first_data_sg;
1382         page_off = cmd->first_data_sg_off;
1383
1384         while (data_length) {
1385                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1386
1387                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388                 crypto_ahash_update(hash);
1389
1390                 data_length -= cur_len;
1391                 page_off = 0;
1392                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1393                 sg = sg_next(sg);
1394         }
1395
1396         if (padding) {
1397                 struct scatterlist pad_sg;
1398
1399                 sg_init_one(&pad_sg, pad_bytes, padding);
1400                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1401                                         padding);
1402                 crypto_ahash_finup(hash);
1403         } else {
1404                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405                 crypto_ahash_final(hash);
1406         }
1407
1408         return data_crc;
1409 }
1410
1411 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1412         const void *buf, u32 payload_length, u32 padding,
1413         const void *pad_bytes, void *data_crc)
1414 {
1415         struct scatterlist sg[2];
1416
1417         sg_init_table(sg, ARRAY_SIZE(sg));
1418         sg_set_buf(sg, buf, payload_length);
1419         if (padding)
1420                 sg_set_buf(sg + 1, pad_bytes, padding);
1421
1422         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1423
1424         crypto_ahash_digest(hash);
1425 }
1426
1427 int
1428 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1429                            struct iscsi_cmd *cmd, u32 payload_length,
1430                            bool *success)
1431 {
1432         struct iscsi_data *hdr = buf;
1433         struct se_cmd *se_cmd;
1434         int rc;
1435
1436         /* iSCSI write */
1437         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1438
1439         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1440                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1441                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1442                 payload_length, conn->cid);
1443
1444         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1445                 pr_err("Command ITT: 0x%08x received DataOUT after"
1446                         " last DataOUT received, dumping payload\n",
1447                         cmd->init_task_tag);
1448                 return iscsit_dump_data_payload(conn, payload_length, 1);
1449         }
1450
1451         if (cmd->data_direction != DMA_TO_DEVICE) {
1452                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1453                         " NON-WRITE command.\n", cmd->init_task_tag);
1454                 return iscsit_dump_data_payload(conn, payload_length, 1);
1455         }
1456         se_cmd = &cmd->se_cmd;
1457         iscsit_mod_dataout_timer(cmd);
1458
1459         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1460                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1461                        be32_to_cpu(hdr->offset), payload_length,
1462                        cmd->se_cmd.data_length);
1463                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1464         }
1465
1466         if (cmd->unsolicited_data) {
1467                 int dump_unsolicited_data = 0;
1468
1469                 if (conn->sess->sess_ops->InitialR2T) {
1470                         pr_err("Received unexpected unsolicited data"
1471                                 " while InitialR2T=Yes, protocol error.\n");
1472                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1473                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1474                         return -1;
1475                 }
1476                 /*
1477                  * Special case for dealing with Unsolicited DataOUT
1478                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1479                  * failures;
1480                  */
1481
1482                 /* Something's amiss if we're not in WRITE_PENDING state... */
1483                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1484                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1485                         dump_unsolicited_data = 1;
1486
1487                 if (dump_unsolicited_data) {
1488                         /*
1489                          * Check if a delayed TASK_ABORTED status needs to
1490                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1491                          * received with the unsolicited data out.
1492                          */
1493                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1494                                 iscsit_stop_dataout_timer(cmd);
1495
1496                         return iscsit_dump_data_payload(conn, payload_length, 1);
1497                 }
1498         } else {
1499                 /*
1500                  * For the normal solicited data path:
1501                  *
1502                  * Check for a delayed TASK_ABORTED status and dump any
1503                  * incoming data out payload if one exists.  Also, when the
1504                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1505                  * data out sequence, we decrement outstanding_r2ts.  Once
1506                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1507                  * TASK_ABORTED status.
1508                  */
1509                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1510                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1511                             --cmd->outstanding_r2ts < 1)
1512                                 iscsit_stop_dataout_timer(cmd);
1513
1514                         return iscsit_dump_data_payload(conn, payload_length, 1);
1515                 }
1516         }
1517         /*
1518          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1519          * within-command recovery checks before receiving the payload.
1520          */
1521         rc = iscsit_check_pre_dataout(cmd, buf);
1522         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1523                 return 0;
1524         else if (rc == DATAOUT_CANNOT_RECOVER)
1525                 return -1;
1526         *success = true;
1527         return 0;
1528 }
1529 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1530
1531 int
1532 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1533                          struct iscsi_cmd **out_cmd)
1534 {
1535         struct iscsi_data *hdr = buf;
1536         struct iscsi_cmd *cmd;
1537         u32 payload_length = ntoh24(hdr->dlength);
1538         int rc;
1539         bool success = false;
1540
1541         if (!payload_length) {
1542                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1543                 return 0;
1544         }
1545
1546         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1547                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1548                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1549                         conn->conn_ops->MaxXmitDataSegmentLength);
1550                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1551         }
1552
1553         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1554         if (!cmd)
1555                 return 0;
1556
1557         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1558
1559         if (success)
1560                 *out_cmd = cmd;
1561
1562         return rc;
1563 }
1564 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1565
1566 static int
1567 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1568                    struct iscsi_data *hdr)
1569 {
1570         struct kvec *iov;
1571         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1572         u32 payload_length = ntoh24(hdr->dlength);
1573         int iov_ret, data_crc_failed = 0;
1574
1575         rx_size += payload_length;
1576         iov = &cmd->iov_data[0];
1577
1578         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1579                                    payload_length);
1580         if (iov_ret < 0)
1581                 return -1;
1582
1583         iov_count += iov_ret;
1584
1585         padding = ((-payload_length) & 3);
1586         if (padding != 0) {
1587                 iov[iov_count].iov_base = cmd->pad_bytes;
1588                 iov[iov_count++].iov_len = padding;
1589                 rx_size += padding;
1590                 pr_debug("Receiving %u padding bytes.\n", padding);
1591         }
1592
1593         if (conn->conn_ops->DataDigest) {
1594                 iov[iov_count].iov_base = &checksum;
1595                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1596                 rx_size += ISCSI_CRC_LEN;
1597         }
1598
1599         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1600
1601         iscsit_unmap_iovec(cmd);
1602
1603         if (rx_got != rx_size)
1604                 return -1;
1605
1606         if (conn->conn_ops->DataDigest) {
1607                 u32 data_crc;
1608
1609                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1610                                                     be32_to_cpu(hdr->offset),
1611                                                     payload_length, padding,
1612                                                     cmd->pad_bytes);
1613
1614                 if (checksum != data_crc) {
1615                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1616                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1617                                 " does not match computed 0x%08x\n",
1618                                 hdr->itt, hdr->offset, payload_length,
1619                                 hdr->datasn, checksum, data_crc);
1620                         data_crc_failed = 1;
1621                 } else {
1622                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1623                                 " %u bytes of Data Out\n", checksum,
1624                                 payload_length);
1625                 }
1626         }
1627
1628         return data_crc_failed;
1629 }
1630
1631 int
1632 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1633                              bool data_crc_failed)
1634 {
1635         struct iscsi_conn *conn = cmd->conn;
1636         int rc, ooo_cmdsn;
1637         /*
1638          * Increment post receive data and CRC values or perform
1639          * within-command recovery.
1640          */
1641         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1642         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1643                 return 0;
1644         else if (rc == DATAOUT_SEND_R2T) {
1645                 iscsit_set_dataout_sequence_values(cmd);
1646                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1647         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1648                 /*
1649                  * Handle extra special case for out of order
1650                  * Unsolicited Data Out.
1651                  */
1652                 spin_lock_bh(&cmd->istate_lock);
1653                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1654                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1655                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1656                 spin_unlock_bh(&cmd->istate_lock);
1657
1658                 iscsit_stop_dataout_timer(cmd);
1659                 if (ooo_cmdsn)
1660                         return 0;
1661                 target_execute_cmd(&cmd->se_cmd);
1662                 return 0;
1663         } else /* DATAOUT_CANNOT_RECOVER */
1664                 return -1;
1665
1666         return 0;
1667 }
1668 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1669
1670 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1671 {
1672         struct iscsi_cmd *cmd = NULL;
1673         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1674         int rc;
1675         bool data_crc_failed = false;
1676
1677         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1678         if (rc < 0)
1679                 return 0;
1680         else if (!cmd)
1681                 return 0;
1682
1683         rc = iscsit_get_dataout(conn, cmd, hdr);
1684         if (rc < 0)
1685                 return rc;
1686         else if (rc > 0)
1687                 data_crc_failed = true;
1688
1689         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1690 }
1691
1692 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1693                          struct iscsi_nopout *hdr)
1694 {
1695         u32 payload_length = ntoh24(hdr->dlength);
1696
1697         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1698                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1699                 if (!cmd)
1700                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1701                                                  (unsigned char *)hdr);
1702
1703                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1704                                          (unsigned char *)hdr);
1705         }
1706
1707         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1708                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1709                         " not set, protocol error.\n");
1710                 if (!cmd)
1711                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1712                                                  (unsigned char *)hdr);
1713
1714                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1715                                          (unsigned char *)hdr);
1716         }
1717
1718         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1719                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1720                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1721                         " error.\n", payload_length,
1722                         conn->conn_ops->MaxXmitDataSegmentLength);
1723                 if (!cmd)
1724                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725                                                  (unsigned char *)hdr);
1726
1727                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728                                          (unsigned char *)hdr);
1729         }
1730
1731         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1732                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1733                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1734                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1735                 payload_length);
1736         /*
1737          * This is not a response to a Unsolicited NopIN, which means
1738          * it can either be a NOPOUT ping request (with a valid ITT),
1739          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1740          * Either way, make sure we allocate an struct iscsi_cmd, as both
1741          * can contain ping data.
1742          */
1743         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1744                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1745                 cmd->i_state            = ISTATE_SEND_NOPIN;
1746                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1747                                                 1 : 0);
1748                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1749                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1750                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1751                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1752                 cmd->data_direction     = DMA_NONE;
1753         }
1754
1755         return 0;
1756 }
1757 EXPORT_SYMBOL(iscsit_setup_nop_out);
1758
1759 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1760                            struct iscsi_nopout *hdr)
1761 {
1762         struct iscsi_cmd *cmd_p = NULL;
1763         int cmdsn_ret = 0;
1764         /*
1765          * Initiator is expecting a NopIN ping reply..
1766          */
1767         if (hdr->itt != RESERVED_ITT) {
1768                 if (!cmd)
1769                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1770                                                 (unsigned char *)hdr);
1771
1772                 spin_lock_bh(&conn->cmd_lock);
1773                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1774                 spin_unlock_bh(&conn->cmd_lock);
1775
1776                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1777
1778                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1779                         iscsit_add_cmd_to_response_queue(cmd, conn,
1780                                                          cmd->i_state);
1781                         return 0;
1782                 }
1783
1784                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1785                                 (unsigned char *)hdr, hdr->cmdsn);
1786                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1787                         return 0;
1788                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1789                         return -1;
1790
1791                 return 0;
1792         }
1793         /*
1794          * This was a response to a unsolicited NOPIN ping.
1795          */
1796         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1797                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1798                 if (!cmd_p)
1799                         return -EINVAL;
1800
1801                 iscsit_stop_nopin_response_timer(conn);
1802
1803                 cmd_p->i_state = ISTATE_REMOVE;
1804                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1805
1806                 iscsit_start_nopin_timer(conn);
1807                 return 0;
1808         }
1809         /*
1810          * Otherwise, initiator is not expecting a NOPIN is response.
1811          * Just ignore for now.
1812          */
1813
1814         if (cmd)
1815                 iscsit_free_cmd(cmd, false);
1816
1817         return 0;
1818 }
1819 EXPORT_SYMBOL(iscsit_process_nop_out);
1820
1821 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1822                                  unsigned char *buf)
1823 {
1824         unsigned char *ping_data = NULL;
1825         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1826         struct kvec *iov = NULL;
1827         u32 payload_length = ntoh24(hdr->dlength);
1828         int ret;
1829
1830         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1831         if (ret < 0)
1832                 return 0;
1833         /*
1834          * Handle NOP-OUT payload for traditional iSCSI sockets
1835          */
1836         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1837                 u32 checksum, data_crc, padding = 0;
1838                 int niov = 0, rx_got, rx_size = payload_length;
1839
1840                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1841                 if (!ping_data) {
1842                         ret = -1;
1843                         goto out;
1844                 }
1845
1846                 iov = &cmd->iov_misc[0];
1847                 iov[niov].iov_base      = ping_data;
1848                 iov[niov++].iov_len     = payload_length;
1849
1850                 padding = ((-payload_length) & 3);
1851                 if (padding != 0) {
1852                         pr_debug("Receiving %u additional bytes"
1853                                 " for padding.\n", padding);
1854                         iov[niov].iov_base      = &cmd->pad_bytes;
1855                         iov[niov++].iov_len     = padding;
1856                         rx_size += padding;
1857                 }
1858                 if (conn->conn_ops->DataDigest) {
1859                         iov[niov].iov_base      = &checksum;
1860                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1861                         rx_size += ISCSI_CRC_LEN;
1862                 }
1863
1864                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1865                 if (rx_got != rx_size) {
1866                         ret = -1;
1867                         goto out;
1868                 }
1869
1870                 if (conn->conn_ops->DataDigest) {
1871                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1872                                                   payload_length, padding,
1873                                                   cmd->pad_bytes, &data_crc);
1874
1875                         if (checksum != data_crc) {
1876                                 pr_err("Ping data CRC32C DataDigest"
1877                                 " 0x%08x does not match computed 0x%08x\n",
1878                                         checksum, data_crc);
1879                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1880                                         pr_err("Unable to recover from"
1881                                         " NOPOUT Ping DataCRC failure while in"
1882                                                 " ERL=0.\n");
1883                                         ret = -1;
1884                                         goto out;
1885                                 } else {
1886                                         /*
1887                                          * Silently drop this PDU and let the
1888                                          * initiator plug the CmdSN gap.
1889                                          */
1890                                         pr_debug("Dropping NOPOUT"
1891                                         " Command CmdSN: 0x%08x due to"
1892                                         " DataCRC error.\n", hdr->cmdsn);
1893                                         ret = 0;
1894                                         goto out;
1895                                 }
1896                         } else {
1897                                 pr_debug("Got CRC32C DataDigest"
1898                                 " 0x%08x for %u bytes of ping data.\n",
1899                                         checksum, payload_length);
1900                         }
1901                 }
1902
1903                 ping_data[payload_length] = '\0';
1904                 /*
1905                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1906                  */
1907                 cmd->buf_ptr = ping_data;
1908                 cmd->buf_ptr_size = payload_length;
1909
1910                 pr_debug("Got %u bytes of NOPOUT ping"
1911                         " data.\n", payload_length);
1912                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1913         }
1914
1915         return iscsit_process_nop_out(conn, cmd, hdr);
1916 out:
1917         if (cmd)
1918                 iscsit_free_cmd(cmd, false);
1919
1920         kfree(ping_data);
1921         return ret;
1922 }
1923
1924 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1925 {
1926         switch (iscsi_tmf) {
1927         case ISCSI_TM_FUNC_ABORT_TASK:
1928                 return TMR_ABORT_TASK;
1929         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1930                 return TMR_ABORT_TASK_SET;
1931         case ISCSI_TM_FUNC_CLEAR_ACA:
1932                 return TMR_CLEAR_ACA;
1933         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1934                 return TMR_CLEAR_TASK_SET;
1935         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1936                 return TMR_LUN_RESET;
1937         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1938                 return TMR_TARGET_WARM_RESET;
1939         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1940                 return TMR_TARGET_COLD_RESET;
1941         default:
1942                 return TMR_UNKNOWN;
1943         }
1944 }
1945
1946 int
1947 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1948                            unsigned char *buf)
1949 {
1950         struct se_tmr_req *se_tmr;
1951         struct iscsi_tmr_req *tmr_req;
1952         struct iscsi_tm *hdr;
1953         int out_of_order_cmdsn = 0, ret;
1954         u8 function, tcm_function = TMR_UNKNOWN;
1955
1956         hdr                     = (struct iscsi_tm *) buf;
1957         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1958         function = hdr->flags;
1959
1960         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1961                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1962                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1963                 hdr->rtt, hdr->refcmdsn, conn->cid);
1964
1965         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1966             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1967              hdr->rtt != RESERVED_ITT)) {
1968                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1969                 hdr->rtt = RESERVED_ITT;
1970         }
1971
1972         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1973                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1974                 pr_err("Task Management Request TASK_REASSIGN not"
1975                         " issued as immediate command, bad iSCSI Initiator"
1976                                 "implementation\n");
1977                 return iscsit_add_reject_cmd(cmd,
1978                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1979         }
1980         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1981             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1982                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1983
1984         cmd->data_direction = DMA_NONE;
1985         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1986         if (!cmd->tmr_req) {
1987                 return iscsit_add_reject_cmd(cmd,
1988                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1989                                              buf);
1990         }
1991
1992         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1993                               conn->sess->se_sess, 0, DMA_NONE,
1994                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1995
1996         target_get_sess_cmd(&cmd->se_cmd, true);
1997
1998         /*
1999          * TASK_REASSIGN for ERL=2 / connection stays inside of
2000          * LIO-Target $FABRIC_MOD
2001          */
2002         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2003                 tcm_function = iscsit_convert_tmf(function);
2004                 if (tcm_function == TMR_UNKNOWN) {
2005                         pr_err("Unknown iSCSI TMR Function:"
2006                                " 0x%02x\n", function);
2007                         return iscsit_add_reject_cmd(cmd,
2008                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2009                 }
2010         }
2011         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2012                                  GFP_KERNEL);
2013         if (ret < 0)
2014                 return iscsit_add_reject_cmd(cmd,
2015                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2016
2017         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2018
2019         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2020         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2021         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2022         cmd->init_task_tag      = hdr->itt;
2023         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2024         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2025         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2026         se_tmr                  = cmd->se_cmd.se_tmr_req;
2027         tmr_req                 = cmd->tmr_req;
2028         /*
2029          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2030          */
2031         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2032                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2033                                                scsilun_to_int(&hdr->lun));
2034                 if (ret < 0) {
2035                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2036                         goto attach;
2037                 }
2038         }
2039
2040         switch (function) {
2041         case ISCSI_TM_FUNC_ABORT_TASK:
2042                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2043                 if (se_tmr->response)
2044                         goto attach;
2045                 break;
2046         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2047         case ISCSI_TM_FUNC_CLEAR_ACA:
2048         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2049         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2050                 break;
2051         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2052                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2053                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2054                         goto attach;
2055                 }
2056                 break;
2057         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2058                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2059                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2060                         goto attach;
2061                 }
2062                 break;
2063         case ISCSI_TM_FUNC_TASK_REASSIGN:
2064                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2065                 /*
2066                  * Perform sanity checks on the ExpDataSN only if the
2067                  * TASK_REASSIGN was successful.
2068                  */
2069                 if (se_tmr->response)
2070                         break;
2071
2072                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2073                         return iscsit_add_reject_cmd(cmd,
2074                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2075                 break;
2076         default:
2077                 pr_err("Unknown TMR function: 0x%02x, protocol"
2078                         " error.\n", function);
2079                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2080                 goto attach;
2081         }
2082
2083         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2084             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2085                 se_tmr->call_transport = 1;
2086 attach:
2087         spin_lock_bh(&conn->cmd_lock);
2088         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2089         spin_unlock_bh(&conn->cmd_lock);
2090
2091         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2092                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2093                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2094                         out_of_order_cmdsn = 1;
2095                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2096                         target_put_sess_cmd(&cmd->se_cmd);
2097                         return 0;
2098                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2099                         return -1;
2100                 }
2101         }
2102         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2103
2104         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2105                 return 0;
2106         /*
2107          * Found the referenced task, send to transport for processing.
2108          */
2109         if (se_tmr->call_transport)
2110                 return transport_generic_handle_tmr(&cmd->se_cmd);
2111
2112         /*
2113          * Could not find the referenced LUN, task, or Task Management
2114          * command not authorized or supported.  Change state and
2115          * let the tx_thread send the response.
2116          *
2117          * For connection recovery, this is also the default action for
2118          * TMR TASK_REASSIGN.
2119          */
2120         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2121         target_put_sess_cmd(&cmd->se_cmd);
2122         return 0;
2123 }
2124 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2125
2126 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2127 int
2128 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2129                       struct iscsi_text *hdr)
2130 {
2131         u32 payload_length = ntoh24(hdr->dlength);
2132
2133         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2134                 pr_err("Unable to accept text parameter length: %u"
2135                         "greater than MaxXmitDataSegmentLength %u.\n",
2136                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2137                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2138                                          (unsigned char *)hdr);
2139         }
2140
2141         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2142              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2143                 pr_err("Multi sequence text commands currently not supported\n");
2144                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2145                                         (unsigned char *)hdr);
2146         }
2147
2148         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2149                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2150                 hdr->exp_statsn, payload_length);
2151
2152         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2153         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2154         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2155         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2156         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2157         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2158         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2159         cmd->data_direction     = DMA_NONE;
2160         kfree(cmd->text_in_ptr);
2161         cmd->text_in_ptr        = NULL;
2162
2163         return 0;
2164 }
2165 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2166
2167 int
2168 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2169                         struct iscsi_text *hdr)
2170 {
2171         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2172         int cmdsn_ret;
2173
2174         if (!text_in) {
2175                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2176                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2177                         pr_err("Unable to locate text_in buffer for sendtargets"
2178                                " discovery\n");
2179                         goto reject;
2180                 }
2181                 goto empty_sendtargets;
2182         }
2183         if (strncmp("SendTargets", text_in, 11) != 0) {
2184                 pr_err("Received Text Data that is not"
2185                         " SendTargets, cannot continue.\n");
2186                 goto reject;
2187         }
2188         text_ptr = strchr(text_in, '=');
2189         if (!text_ptr) {
2190                 pr_err("No \"=\" separator found in Text Data,"
2191                         "  cannot continue.\n");
2192                 goto reject;
2193         }
2194         if (!strncmp("=All", text_ptr, 4)) {
2195                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2196         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2197                    !strncmp("=eui.", text_ptr, 5)) {
2198                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2199         } else {
2200                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2201                 goto reject;
2202         }
2203
2204         spin_lock_bh(&conn->cmd_lock);
2205         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2206         spin_unlock_bh(&conn->cmd_lock);
2207
2208 empty_sendtargets:
2209         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2210
2211         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2212                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2213                                 (unsigned char *)hdr, hdr->cmdsn);
2214                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2215                         return -1;
2216
2217                 return 0;
2218         }
2219
2220         return iscsit_execute_cmd(cmd, 0);
2221
2222 reject:
2223         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2224                                  (unsigned char *)hdr);
2225 }
2226 EXPORT_SYMBOL(iscsit_process_text_cmd);
2227
2228 static int
2229 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2230                        unsigned char *buf)
2231 {
2232         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2233         char *text_in = NULL;
2234         u32 payload_length = ntoh24(hdr->dlength);
2235         int rx_size, rc;
2236
2237         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2238         if (rc < 0)
2239                 return 0;
2240
2241         rx_size = payload_length;
2242         if (payload_length) {
2243                 u32 checksum = 0, data_crc = 0;
2244                 u32 padding = 0, pad_bytes = 0;
2245                 int niov = 0, rx_got;
2246                 struct kvec iov[3];
2247
2248                 text_in = kzalloc(payload_length, GFP_KERNEL);
2249                 if (!text_in)
2250                         goto reject;
2251
2252                 cmd->text_in_ptr = text_in;
2253
2254                 memset(iov, 0, 3 * sizeof(struct kvec));
2255                 iov[niov].iov_base      = text_in;
2256                 iov[niov++].iov_len     = payload_length;
2257
2258                 padding = ((-payload_length) & 3);
2259                 if (padding != 0) {
2260                         iov[niov].iov_base = &pad_bytes;
2261                         iov[niov++].iov_len  = padding;
2262                         rx_size += padding;
2263                         pr_debug("Receiving %u additional bytes"
2264                                         " for padding.\n", padding);
2265                 }
2266                 if (conn->conn_ops->DataDigest) {
2267                         iov[niov].iov_base      = &checksum;
2268                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2269                         rx_size += ISCSI_CRC_LEN;
2270                 }
2271
2272                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2273                 if (rx_got != rx_size)
2274                         goto reject;
2275
2276                 if (conn->conn_ops->DataDigest) {
2277                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2278                                                   payload_length, padding,
2279                                                   &pad_bytes, &data_crc);
2280
2281                         if (checksum != data_crc) {
2282                                 pr_err("Text data CRC32C DataDigest"
2283                                         " 0x%08x does not match computed"
2284                                         " 0x%08x\n", checksum, data_crc);
2285                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2286                                         pr_err("Unable to recover from"
2287                                         " Text Data digest failure while in"
2288                                                 " ERL=0.\n");
2289                                         goto reject;
2290                                 } else {
2291                                         /*
2292                                          * Silently drop this PDU and let the
2293                                          * initiator plug the CmdSN gap.
2294                                          */
2295                                         pr_debug("Dropping Text"
2296                                         " Command CmdSN: 0x%08x due to"
2297                                         " DataCRC error.\n", hdr->cmdsn);
2298                                         kfree(text_in);
2299                                         return 0;
2300                                 }
2301                         } else {
2302                                 pr_debug("Got CRC32C DataDigest"
2303                                         " 0x%08x for %u bytes of text data.\n",
2304                                                 checksum, payload_length);
2305                         }
2306                 }
2307                 text_in[payload_length - 1] = '\0';
2308                 pr_debug("Successfully read %d bytes of text"
2309                                 " data.\n", payload_length);
2310         }
2311
2312         return iscsit_process_text_cmd(conn, cmd, hdr);
2313
2314 reject:
2315         kfree(cmd->text_in_ptr);
2316         cmd->text_in_ptr = NULL;
2317         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2318 }
2319
2320 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2321 {
2322         struct iscsi_conn *conn_p;
2323         struct iscsi_session *sess = conn->sess;
2324
2325         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2326                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2327
2328         atomic_set(&sess->session_logout, 1);
2329         atomic_set(&conn->conn_logout_remove, 1);
2330         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2331
2332         iscsit_inc_conn_usage_count(conn);
2333         iscsit_inc_session_usage_count(sess);
2334
2335         spin_lock_bh(&sess->conn_lock);
2336         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2337                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2338                         continue;
2339
2340                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2341                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2342         }
2343         spin_unlock_bh(&sess->conn_lock);
2344
2345         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2346
2347         return 0;
2348 }
2349
2350 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2351 {
2352         struct iscsi_conn *l_conn;
2353         struct iscsi_session *sess = conn->sess;
2354
2355         pr_debug("Received logout request CLOSECONNECTION for CID:"
2356                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2357
2358         /*
2359          * A Logout Request with a CLOSECONNECTION reason code for a CID
2360          * can arrive on a connection with a differing CID.
2361          */
2362         if (conn->cid == cmd->logout_cid) {
2363                 spin_lock_bh(&conn->state_lock);
2364                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2365                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2366
2367                 atomic_set(&conn->conn_logout_remove, 1);
2368                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2369                 iscsit_inc_conn_usage_count(conn);
2370
2371                 spin_unlock_bh(&conn->state_lock);
2372         } else {
2373                 /*
2374                  * Handle all different cid CLOSECONNECTION requests in
2375                  * iscsit_logout_post_handler_diffcid() as to give enough
2376                  * time for any non immediate command's CmdSN to be
2377                  * acknowledged on the connection in question.
2378                  *
2379                  * Here we simply make sure the CID is still around.
2380                  */
2381                 l_conn = iscsit_get_conn_from_cid(sess,
2382                                 cmd->logout_cid);
2383                 if (!l_conn) {
2384                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2385                         iscsit_add_cmd_to_response_queue(cmd, conn,
2386                                         cmd->i_state);
2387                         return 0;
2388                 }
2389
2390                 iscsit_dec_conn_usage_count(l_conn);
2391         }
2392
2393         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2394
2395         return 0;
2396 }
2397
2398 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2399 {
2400         struct iscsi_session *sess = conn->sess;
2401
2402         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2403                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2404
2405         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2406                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2407                         " while ERL!=2.\n");
2408                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2409                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410                 return 0;
2411         }
2412
2413         if (conn->cid == cmd->logout_cid) {
2414                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2415                         " with CID: %hu on CID: %hu, implementation error.\n",
2416                                 cmd->logout_cid, conn->cid);
2417                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2418                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2419                 return 0;
2420         }
2421
2422         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423
2424         return 0;
2425 }
2426
2427 int
2428 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2429                         unsigned char *buf)
2430 {
2431         int cmdsn_ret, logout_remove = 0;
2432         u8 reason_code = 0;
2433         struct iscsi_logout *hdr;
2434         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2435
2436         hdr                     = (struct iscsi_logout *) buf;
2437         reason_code             = (hdr->flags & 0x7f);
2438
2439         if (tiqn) {
2440                 spin_lock(&tiqn->logout_stats.lock);
2441                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2442                         tiqn->logout_stats.normal_logouts++;
2443                 else
2444                         tiqn->logout_stats.abnormal_logouts++;
2445                 spin_unlock(&tiqn->logout_stats.lock);
2446         }
2447
2448         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2449                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2450                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2451                 hdr->cid, conn->cid);
2452
2453         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2454                 pr_err("Received logout request on connection that"
2455                         " is not in logged in state, ignoring request.\n");
2456                 iscsit_free_cmd(cmd, false);
2457                 return 0;
2458         }
2459
2460         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2461         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2462         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2463         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2464         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2465         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2466         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2467         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2468         cmd->logout_reason      = reason_code;
2469         cmd->data_direction     = DMA_NONE;
2470
2471         /*
2472          * We need to sleep in these cases (by returning 1) until the Logout
2473          * Response gets sent in the tx thread.
2474          */
2475         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2476            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2477             be16_to_cpu(hdr->cid) == conn->cid))
2478                 logout_remove = 1;
2479
2480         spin_lock_bh(&conn->cmd_lock);
2481         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2482         spin_unlock_bh(&conn->cmd_lock);
2483
2484         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2485                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2486
2487         /*
2488          * Immediate commands are executed, well, immediately.
2489          * Non-Immediate Logout Commands are executed in CmdSN order.
2490          */
2491         if (cmd->immediate_cmd) {
2492                 int ret = iscsit_execute_cmd(cmd, 0);
2493
2494                 if (ret < 0)
2495                         return ret;
2496         } else {
2497                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2498                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2499                         logout_remove = 0;
2500                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2501                         return -1;
2502         }
2503
2504         return logout_remove;
2505 }
2506 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2507
2508 int iscsit_handle_snack(
2509         struct iscsi_conn *conn,
2510         unsigned char *buf)
2511 {
2512         struct iscsi_snack *hdr;
2513
2514         hdr                     = (struct iscsi_snack *) buf;
2515         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2516
2517         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2518                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2519                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2520                         hdr->begrun, hdr->runlength, conn->cid);
2521
2522         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2523                 pr_err("Initiator sent SNACK request while in"
2524                         " ErrorRecoveryLevel=0.\n");
2525                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2526                                          buf);
2527         }
2528         /*
2529          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2530          * call from inside iscsi_send_recovery_datain_or_r2t().
2531          */
2532         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2533         case 0:
2534                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2535                         hdr->itt,
2536                         be32_to_cpu(hdr->ttt),
2537                         be32_to_cpu(hdr->begrun),
2538                         be32_to_cpu(hdr->runlength));
2539         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2540                 return iscsit_handle_status_snack(conn, hdr->itt,
2541                         be32_to_cpu(hdr->ttt),
2542                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2543         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2544                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2545                         be32_to_cpu(hdr->begrun),
2546                         be32_to_cpu(hdr->runlength));
2547         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2548                 /* FIXME: Support R-Data SNACK */
2549                 pr_err("R-Data SNACK Not Supported.\n");
2550                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2551                                          buf);
2552         default:
2553                 pr_err("Unknown SNACK type 0x%02x, protocol"
2554                         " error.\n", hdr->flags & 0x0f);
2555                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556                                          buf);
2557         }
2558
2559         return 0;
2560 }
2561 EXPORT_SYMBOL(iscsit_handle_snack);
2562
2563 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2564 {
2565         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2566             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2567                 wait_for_completion_interruptible_timeout(
2568                                         &conn->rx_half_close_comp,
2569                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2570         }
2571 }
2572
2573 static int iscsit_handle_immediate_data(
2574         struct iscsi_cmd *cmd,
2575         struct iscsi_scsi_req *hdr,
2576         u32 length)
2577 {
2578         int iov_ret, rx_got = 0, rx_size = 0;
2579         u32 checksum, iov_count = 0, padding = 0;
2580         struct iscsi_conn *conn = cmd->conn;
2581         struct kvec *iov;
2582
2583         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2584         if (iov_ret < 0)
2585                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2586
2587         rx_size = length;
2588         iov_count = iov_ret;
2589         iov = &cmd->iov_data[0];
2590
2591         padding = ((-length) & 3);
2592         if (padding != 0) {
2593                 iov[iov_count].iov_base = cmd->pad_bytes;
2594                 iov[iov_count++].iov_len = padding;
2595                 rx_size += padding;
2596         }
2597
2598         if (conn->conn_ops->DataDigest) {
2599                 iov[iov_count].iov_base         = &checksum;
2600                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2601                 rx_size += ISCSI_CRC_LEN;
2602         }
2603
2604         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2605
2606         iscsit_unmap_iovec(cmd);
2607
2608         if (rx_got != rx_size) {
2609                 iscsit_rx_thread_wait_for_tcp(conn);
2610                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2611         }
2612
2613         if (conn->conn_ops->DataDigest) {
2614                 u32 data_crc;
2615
2616                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2617                                                     cmd->write_data_done, length, padding,
2618                                                     cmd->pad_bytes);
2619
2620                 if (checksum != data_crc) {
2621                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2622                                 " does not match computed 0x%08x\n", checksum,
2623                                 data_crc);
2624
2625                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2626                                 pr_err("Unable to recover from"
2627                                         " Immediate Data digest failure while"
2628                                         " in ERL=0.\n");
2629                                 iscsit_reject_cmd(cmd,
2630                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2631                                                 (unsigned char *)hdr);
2632                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2633                         } else {
2634                                 iscsit_reject_cmd(cmd,
2635                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2636                                                 (unsigned char *)hdr);
2637                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2638                         }
2639                 } else {
2640                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2641                                 " %u bytes of Immediate Data\n", checksum,
2642                                 length);
2643                 }
2644         }
2645
2646         cmd->write_data_done += length;
2647
2648         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2649                 spin_lock_bh(&cmd->istate_lock);
2650                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2651                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2652                 spin_unlock_bh(&cmd->istate_lock);
2653         }
2654
2655         return IMMEDIATE_DATA_NORMAL_OPERATION;
2656 }
2657
2658 /*
2659  *      Called with sess->conn_lock held.
2660  */
2661 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2662         with active network interface */
2663 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2664 {
2665         struct iscsi_cmd *cmd;
2666         struct iscsi_conn *conn_p;
2667         bool found = false;
2668
2669         /*
2670          * Only send a Asynchronous Message on connections whos network
2671          * interface is still functional.
2672          */
2673         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2674                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2675                         iscsit_inc_conn_usage_count(conn_p);
2676                         found = true;
2677                         break;
2678                 }
2679         }
2680
2681         if (!found)
2682                 return;
2683
2684         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2685         if (!cmd) {
2686                 iscsit_dec_conn_usage_count(conn_p);
2687                 return;
2688         }
2689
2690         cmd->logout_cid = conn->cid;
2691         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2692         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2693
2694         spin_lock_bh(&conn_p->cmd_lock);
2695         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2696         spin_unlock_bh(&conn_p->cmd_lock);
2697
2698         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2699         iscsit_dec_conn_usage_count(conn_p);
2700 }
2701
2702 static int iscsit_send_conn_drop_async_message(
2703         struct iscsi_cmd *cmd,
2704         struct iscsi_conn *conn)
2705 {
2706         struct iscsi_async *hdr;
2707
2708         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2709
2710         hdr                     = (struct iscsi_async *) cmd->pdu;
2711         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2712         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2713         cmd->init_task_tag      = RESERVED_ITT;
2714         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2715         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2716         cmd->stat_sn            = conn->stat_sn++;
2717         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2718         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2719         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2720         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2721         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2722         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2723         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2724
2725         pr_debug("Sending Connection Dropped Async Message StatSN:"
2726                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2727                         cmd->logout_cid, conn->cid);
2728
2729         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2730 }
2731
2732 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2733 {
2734         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2735             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2736                 wait_for_completion_interruptible_timeout(
2737                                         &conn->tx_half_close_comp,
2738                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2739         }
2740 }
2741
2742 void
2743 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2744                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2745                         bool set_statsn)
2746 {
2747         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2748         hdr->flags              = datain->flags;
2749         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2750                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2751                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2752                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2753                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2754                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2755                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2756                 }
2757         }
2758         hton24(hdr->dlength, datain->length);
2759         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2760                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2761                                 (struct scsi_lun *)&hdr->lun);
2762         else
2763                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2764
2765         hdr->itt                = cmd->init_task_tag;
2766
2767         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2768                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2769         else
2770                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2771         if (set_statsn)
2772                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2773         else
2774                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2775
2776         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2777         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2778         hdr->datasn             = cpu_to_be32(datain->data_sn);
2779         hdr->offset             = cpu_to_be32(datain->offset);
2780
2781         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2782                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2783                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2784                 ntohl(hdr->offset), datain->length, conn->cid);
2785 }
2786 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2787
2788 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2789 {
2790         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2791         struct iscsi_datain datain;
2792         struct iscsi_datain_req *dr;
2793         int eodr = 0, ret;
2794         bool set_statsn = false;
2795
2796         memset(&datain, 0, sizeof(struct iscsi_datain));
2797         dr = iscsit_get_datain_values(cmd, &datain);
2798         if (!dr) {
2799                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2800                                 cmd->init_task_tag);
2801                 return -1;
2802         }
2803         /*
2804          * Be paranoid and double check the logic for now.
2805          */
2806         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2807                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2808                         " datain.length: %u exceeds cmd->data_length: %u\n",
2809                         cmd->init_task_tag, datain.offset, datain.length,
2810                         cmd->se_cmd.data_length);
2811                 return -1;
2812         }
2813
2814         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2815         /*
2816          * Special case for successfully execution w/ both DATAIN
2817          * and Sense Data.
2818          */
2819         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2820             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2821                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2822         else {
2823                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2824                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2825                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2826                         cmd->stat_sn = conn->stat_sn++;
2827                         set_statsn = true;
2828                 } else if (dr->dr_complete ==
2829                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2830                         set_statsn = true;
2831         }
2832
2833         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2834
2835         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2836         if (ret < 0)
2837                 return ret;
2838
2839         if (dr->dr_complete) {
2840                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2841                                 2 : 1;
2842                 iscsit_free_datain_req(cmd, dr);
2843         }
2844
2845         return eodr;
2846 }
2847
2848 int
2849 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2850                         struct iscsi_logout_rsp *hdr)
2851 {
2852         struct iscsi_conn *logout_conn = NULL;
2853         struct iscsi_conn_recovery *cr = NULL;
2854         struct iscsi_session *sess = conn->sess;
2855         /*
2856          * The actual shutting down of Sessions and/or Connections
2857          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2858          * is done in scsi_logout_post_handler().
2859          */
2860         switch (cmd->logout_reason) {
2861         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2862                 pr_debug("iSCSI session logout successful, setting"
2863                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2864                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2865                 break;
2866         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2867                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2868                         break;
2869                 /*
2870                  * For CLOSECONNECTION logout requests carrying
2871                  * a matching logout CID -> local CID, the reference
2872                  * for the local CID will have been incremented in
2873                  * iscsi_logout_closeconnection().
2874                  *
2875                  * For CLOSECONNECTION logout requests carrying
2876                  * a different CID than the connection it arrived
2877                  * on, the connection responding to cmd->logout_cid
2878                  * is stopped in iscsit_logout_post_handler_diffcid().
2879                  */
2880
2881                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2882                         " successful.\n", cmd->logout_cid, conn->cid);
2883                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2884                 break;
2885         case ISCSI_LOGOUT_REASON_RECOVERY:
2886                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2887                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2888                         break;
2889                 /*
2890                  * If the connection is still active from our point of view
2891                  * force connection recovery to occur.
2892                  */
2893                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2894                                 cmd->logout_cid);
2895                 if (logout_conn) {
2896                         iscsit_connection_reinstatement_rcfr(logout_conn);
2897                         iscsit_dec_conn_usage_count(logout_conn);
2898                 }
2899
2900                 cr = iscsit_get_inactive_connection_recovery_entry(
2901                                 conn->sess, cmd->logout_cid);
2902                 if (!cr) {
2903                         pr_err("Unable to locate CID: %hu for"
2904                         " REMOVECONNFORRECOVERY Logout Request.\n",
2905                                 cmd->logout_cid);
2906                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2907                         break;
2908                 }
2909
2910                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2911
2912                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2913                         " for recovery for CID: %hu on CID: %hu successful.\n",
2914                                 cmd->logout_cid, conn->cid);
2915                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2916                 break;
2917         default:
2918                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2919                                 cmd->logout_reason);
2920                 return -1;
2921         }
2922
2923         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2924         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2925         hdr->response           = cmd->logout_response;
2926         hdr->itt                = cmd->init_task_tag;
2927         cmd->stat_sn            = conn->stat_sn++;
2928         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2929
2930         iscsit_increment_maxcmdsn(cmd, conn->sess);
2931         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2932         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2933
2934         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2935                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2936                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2937                 cmd->logout_cid, conn->cid);
2938
2939         return 0;
2940 }
2941 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2942
2943 static int
2944 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2945 {
2946         int rc;
2947
2948         rc = iscsit_build_logout_rsp(cmd, conn,
2949                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2950         if (rc < 0)
2951                 return rc;
2952
2953         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2954 }
2955
2956 void
2957 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2958                        struct iscsi_nopin *hdr, bool nopout_response)
2959 {
2960         hdr->opcode             = ISCSI_OP_NOOP_IN;
2961         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2962         hton24(hdr->dlength, cmd->buf_ptr_size);
2963         if (nopout_response)
2964                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2965         hdr->itt                = cmd->init_task_tag;
2966         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2967         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2968                                   conn->stat_sn;
2969         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2970
2971         if (nopout_response)
2972                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2973
2974         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2975         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2976
2977         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2978                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2979                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2980                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2981 }
2982 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2983
2984 /*
2985  *      Unsolicited NOPIN, either requesting a response or not.
2986  */
2987 static int iscsit_send_unsolicited_nopin(
2988         struct iscsi_cmd *cmd,
2989         struct iscsi_conn *conn,
2990         int want_response)
2991 {
2992         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2993         int ret;
2994
2995         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2996
2997         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2998                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2999
3000         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3001         if (ret < 0)
3002                 return ret;
3003
3004         spin_lock_bh(&cmd->istate_lock);
3005         cmd->i_state = want_response ?
3006                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3007         spin_unlock_bh(&cmd->istate_lock);
3008
3009         return 0;
3010 }
3011
3012 static int
3013 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3014 {
3015         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3016
3017         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3018
3019         /*
3020          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3021          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3022          */
3023         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3024
3025         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3026                                                      cmd->buf_ptr,
3027                                                      cmd->buf_ptr_size);
3028 }
3029
3030 static int iscsit_send_r2t(
3031         struct iscsi_cmd *cmd,
3032         struct iscsi_conn *conn)
3033 {
3034         struct iscsi_r2t *r2t;
3035         struct iscsi_r2t_rsp *hdr;
3036         int ret;
3037
3038         r2t = iscsit_get_r2t_from_list(cmd);
3039         if (!r2t)
3040                 return -1;
3041
3042         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3043         memset(hdr, 0, ISCSI_HDR_LEN);
3044         hdr->opcode             = ISCSI_OP_R2T;
3045         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3046         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3047                         (struct scsi_lun *)&hdr->lun);
3048         hdr->itt                = cmd->init_task_tag;
3049         if (conn->conn_transport->iscsit_get_r2t_ttt)
3050                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3051         else
3052                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3053         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3054         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3055         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3056         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3057         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3058         hdr->data_offset        = cpu_to_be32(r2t->offset);
3059         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3060
3061         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3062                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3063                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3064                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3065                         r2t->offset, r2t->xfer_len, conn->cid);
3066
3067         spin_lock_bh(&cmd->r2t_lock);
3068         r2t->sent_r2t = 1;
3069         spin_unlock_bh(&cmd->r2t_lock);
3070
3071         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3072         if (ret < 0) {
3073                 return ret;
3074         }
3075
3076         spin_lock_bh(&cmd->dataout_timeout_lock);
3077         iscsit_start_dataout_timer(cmd, conn);
3078         spin_unlock_bh(&cmd->dataout_timeout_lock);
3079
3080         return 0;
3081 }
3082
3083 /*
3084  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3085  *              connection recovery.
3086  */
3087 int iscsit_build_r2ts_for_cmd(
3088         struct iscsi_conn *conn,
3089         struct iscsi_cmd *cmd,
3090         bool recovery)
3091 {
3092         int first_r2t = 1;
3093         u32 offset = 0, xfer_len = 0;
3094
3095         spin_lock_bh(&cmd->r2t_lock);
3096         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3097                 spin_unlock_bh(&cmd->r2t_lock);
3098                 return 0;
3099         }
3100
3101         if (conn->sess->sess_ops->DataSequenceInOrder &&
3102             !recovery)
3103                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3104
3105         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3106                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3107                         offset = cmd->r2t_offset;
3108
3109                         if (first_r2t && recovery) {
3110                                 int new_data_end = offset +
3111                                         conn->sess->sess_ops->MaxBurstLength -
3112                                         cmd->next_burst_len;
3113
3114                                 if (new_data_end > cmd->se_cmd.data_length)
3115                                         xfer_len = cmd->se_cmd.data_length - offset;
3116                                 else
3117                                         xfer_len =
3118                                                 conn->sess->sess_ops->MaxBurstLength -
3119                                                 cmd->next_burst_len;
3120                         } else {
3121                                 int new_data_end = offset +
3122                                         conn->sess->sess_ops->MaxBurstLength;
3123
3124                                 if (new_data_end > cmd->se_cmd.data_length)
3125                                         xfer_len = cmd->se_cmd.data_length - offset;
3126                                 else
3127                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3128                         }
3129                         cmd->r2t_offset += xfer_len;
3130
3131                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3132                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3133                 } else {
3134                         struct iscsi_seq *seq;
3135
3136                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3137                         if (!seq) {
3138                                 spin_unlock_bh(&cmd->r2t_lock);
3139                                 return -1;
3140                         }
3141
3142                         offset = seq->offset;
3143                         xfer_len = seq->xfer_len;
3144
3145                         if (cmd->seq_send_order == cmd->seq_count)
3146                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3147                 }
3148                 cmd->outstanding_r2ts++;
3149                 first_r2t = 0;
3150
3151                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3152                         spin_unlock_bh(&cmd->r2t_lock);
3153                         return -1;
3154                 }
3155
3156                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3157                         break;
3158         }
3159         spin_unlock_bh(&cmd->r2t_lock);
3160
3161         return 0;
3162 }
3163 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3164
3165 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3166                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3167 {
3168         if (inc_stat_sn)
3169                 cmd->stat_sn = conn->stat_sn++;
3170
3171         atomic_long_inc(&conn->sess->rsp_pdus);
3172
3173         memset(hdr, 0, ISCSI_HDR_LEN);
3174         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3175         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3176         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3177                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3178                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3180                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3181                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3182         }
3183         hdr->response           = cmd->iscsi_response;
3184         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3185         hdr->itt                = cmd->init_task_tag;
3186         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3187
3188         iscsit_increment_maxcmdsn(cmd, conn->sess);
3189         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3190         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3191
3192         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3193                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3194                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3195                 cmd->se_cmd.scsi_status, conn->cid);
3196 }
3197 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3198
3199 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3200 {
3201         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3202         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3203         void *data_buf = NULL;
3204         u32 padding = 0, data_buf_len = 0;
3205
3206         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3207
3208         /*
3209          * Attach SENSE DATA payload to iSCSI Response PDU
3210          */
3211         if (cmd->se_cmd.sense_buffer &&
3212            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3213             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3214                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3215                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3216
3217                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3218                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3219                 data_buf = cmd->sense_buffer;
3220                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3221
3222                 if (padding) {
3223                         memset(cmd->sense_buffer +
3224                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3225                         pr_debug("Adding %u bytes of padding to"
3226                                 " SENSE.\n", padding);
3227                 }
3228
3229                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3230                                 " Response PDU\n",
3231                                 cmd->se_cmd.scsi_sense_length);
3232         }
3233
3234         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3235                                                      data_buf_len);
3236 }
3237
3238 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3239 {
3240         switch (se_tmr->response) {
3241         case TMR_FUNCTION_COMPLETE:
3242                 return ISCSI_TMF_RSP_COMPLETE;
3243         case TMR_TASK_DOES_NOT_EXIST:
3244                 return ISCSI_TMF_RSP_NO_TASK;
3245         case TMR_LUN_DOES_NOT_EXIST:
3246                 return ISCSI_TMF_RSP_NO_LUN;
3247         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3248                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3249         case TMR_FUNCTION_REJECTED:
3250         default:
3251                 return ISCSI_TMF_RSP_REJECTED;
3252         }
3253 }
3254
3255 void
3256 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3257                           struct iscsi_tm_rsp *hdr)
3258 {
3259         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3260
3261         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3262         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3263         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3264         hdr->itt                = cmd->init_task_tag;
3265         cmd->stat_sn            = conn->stat_sn++;
3266         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3267
3268         iscsit_increment_maxcmdsn(cmd, conn->sess);
3269         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3270         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3271
3272         pr_debug("Built Task Management Response ITT: 0x%08x,"
3273                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3274                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3275 }
3276 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3277
3278 static int
3279 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3280 {
3281         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3282
3283         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3284
3285         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3286 }
3287
3288 #define SENDTARGETS_BUF_LIMIT 32768U
3289
3290 static int
3291 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3292                                   enum iscsit_transport_type network_transport,
3293                                   int skip_bytes, bool *completed)
3294 {
3295         char *payload = NULL;
3296         struct iscsi_conn *conn = cmd->conn;
3297         struct iscsi_portal_group *tpg;
3298         struct iscsi_tiqn *tiqn;
3299         struct iscsi_tpg_np *tpg_np;
3300         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3301         int target_name_printed;
3302         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3303         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3304         bool active;
3305
3306         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3307                          SENDTARGETS_BUF_LIMIT);
3308
3309         payload = kzalloc(buffer_len, GFP_KERNEL);
3310         if (!payload)
3311                 return -ENOMEM;
3312
3313         /*
3314          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3315          * explicit case..
3316          */
3317         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3318                 text_ptr = strchr(text_in, '=');
3319                 if (!text_ptr) {
3320                         pr_err("Unable to locate '=' string in text_in:"
3321                                " %s\n", text_in);
3322                         kfree(payload);
3323                         return -EINVAL;
3324                 }
3325                 /*
3326                  * Skip over '=' character..
3327                  */
3328                 text_ptr += 1;
3329         }
3330
3331         spin_lock(&tiqn_lock);
3332         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3333                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3334                      strcmp(tiqn->tiqn, text_ptr)) {
3335                         continue;
3336                 }
3337
3338                 target_name_printed = 0;
3339
3340                 spin_lock(&tiqn->tiqn_tpg_lock);
3341                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3342
3343                         /* If demo_mode_discovery=0 and generate_node_acls=0
3344                          * (demo mode dislabed) do not return
3345                          * TargetName+TargetAddress unless a NodeACL exists.
3346                          */
3347
3348                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3349                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3350                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3351                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3352                                 continue;
3353                         }
3354
3355                         spin_lock(&tpg->tpg_state_lock);
3356                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3357                         spin_unlock(&tpg->tpg_state_lock);
3358
3359                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3360                                 continue;
3361
3362                         spin_lock(&tpg->tpg_np_lock);
3363                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3364                                                 tpg_np_list) {
3365                                 struct iscsi_np *np = tpg_np->tpg_np;
3366                                 struct sockaddr_storage *sockaddr;
3367
3368                                 if (np->np_network_transport != network_transport)
3369                                         continue;
3370
3371                                 if (!target_name_printed) {
3372                                         len = sprintf(buf, "TargetName=%s",
3373                                                       tiqn->tiqn);
3374                                         len += 1;
3375
3376                                         if ((len + payload_len) > buffer_len) {
3377                                                 spin_unlock(&tpg->tpg_np_lock);
3378                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3379                                                 end_of_buf = 1;
3380                                                 goto eob;
3381                                         }
3382
3383                                         if (skip_bytes && len <= skip_bytes) {
3384                                                 skip_bytes -= len;
3385                                         } else {
3386                                                 memcpy(payload + payload_len, buf, len);
3387                                                 payload_len += len;
3388                                                 target_name_printed = 1;
3389                                                 if (len > skip_bytes)
3390                                                         skip_bytes = 0;
3391                                         }
3392                                 }
3393
3394                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3395                                         sockaddr = &conn->local_sockaddr;
3396                                 else
3397                                         sockaddr = &np->np_sockaddr;
3398
3399                                 len = sprintf(buf, "TargetAddress="
3400                                               "%pISpc,%hu",
3401                                               sockaddr,
3402                                               tpg->tpgt);
3403                                 len += 1;
3404
3405                                 if ((len + payload_len) > buffer_len) {
3406                                         spin_unlock(&tpg->tpg_np_lock);
3407                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3408                                         end_of_buf = 1;
3409                                         goto eob;
3410                                 }
3411
3412                                 if (skip_bytes && len <= skip_bytes) {
3413                                         skip_bytes -= len;
3414                                 } else {
3415                                         memcpy(payload + payload_len, buf, len);
3416                                         payload_len += len;
3417                                         if (len > skip_bytes)
3418                                                 skip_bytes = 0;
3419                                 }
3420                         }
3421                         spin_unlock(&tpg->tpg_np_lock);
3422                 }
3423                 spin_unlock(&tiqn->tiqn_tpg_lock);
3424 eob:
3425                 if (end_of_buf) {
3426                         *completed = false;
3427                         break;
3428                 }
3429
3430                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3431                         break;
3432         }
3433         spin_unlock(&tiqn_lock);
3434
3435         cmd->buf_ptr = payload;
3436
3437         return payload_len;
3438 }
3439
3440 int
3441 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3442                       struct iscsi_text_rsp *hdr,
3443                       enum iscsit_transport_type network_transport)
3444 {
3445         int text_length, padding;
3446         bool completed = true;
3447
3448         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3449                                                         cmd->read_data_done,
3450                                                         &completed);
3451         if (text_length < 0)
3452                 return text_length;
3453
3454         if (completed) {
3455                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3456         } else {
3457                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3458                 cmd->read_data_done += text_length;
3459                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3460                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3461         }
3462         hdr->opcode = ISCSI_OP_TEXT_RSP;
3463         padding = ((-text_length) & 3);
3464         hton24(hdr->dlength, text_length);
3465         hdr->itt = cmd->init_task_tag;
3466         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3467         cmd->stat_sn = conn->stat_sn++;
3468         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3469
3470         iscsit_increment_maxcmdsn(cmd, conn->sess);
3471         /*
3472          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3473          * correctly increment MaxCmdSN for each response answering a
3474          * non immediate text request with a valid CmdSN.
3475          */
3476         cmd->maxcmdsn_inc = 0;
3477         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3478         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3479
3480         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3481                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3482                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3483                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3484                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3485
3486         return text_length + padding;
3487 }
3488 EXPORT_SYMBOL(iscsit_build_text_rsp);
3489
3490 static int iscsit_send_text_rsp(
3491         struct iscsi_cmd *cmd,
3492         struct iscsi_conn *conn)
3493 {
3494         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3495         int text_length;
3496
3497         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3498                                 conn->conn_transport->transport_type);
3499         if (text_length < 0)
3500                 return text_length;
3501
3502         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3503                                                      cmd->buf_ptr,
3504                                                      text_length);
3505 }
3506
3507 void
3508 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3509                     struct iscsi_reject *hdr)
3510 {
3511         hdr->opcode             = ISCSI_OP_REJECT;
3512         hdr->reason             = cmd->reject_reason;
3513         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3514         hton24(hdr->dlength, ISCSI_HDR_LEN);
3515         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3516         cmd->stat_sn            = conn->stat_sn++;
3517         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3518         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3519         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3520
3521 }
3522 EXPORT_SYMBOL(iscsit_build_reject);
3523
3524 static int iscsit_send_reject(
3525         struct iscsi_cmd *cmd,
3526         struct iscsi_conn *conn)
3527 {
3528         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3529
3530         iscsit_build_reject(cmd, conn, hdr);
3531
3532         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3533                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3534
3535         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3536                                                      cmd->buf_ptr,
3537                                                      ISCSI_HDR_LEN);
3538 }
3539
3540 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3541 {
3542         int ord, cpu;
3543         /*
3544          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3545          * within iscsit_start_kthreads()
3546          *
3547          * Here we use bitmap_id to determine which CPU that this
3548          * iSCSI connection's RX/TX threads will be scheduled to
3549          * execute upon.
3550          */
3551         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3552         for_each_online_cpu(cpu) {
3553                 if (ord-- == 0) {
3554                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3555                         return;
3556                 }
3557         }
3558         /*
3559          * This should never be reached..
3560          */
3561         dump_stack();
3562         cpumask_setall(conn->conn_cpumask);
3563 }
3564
3565 int
3566 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3567 {
3568         int ret;
3569
3570         switch (state) {
3571         case ISTATE_SEND_R2T:
3572                 ret = iscsit_send_r2t(cmd, conn);
3573                 if (ret < 0)
3574                         goto err;
3575                 break;
3576         case ISTATE_REMOVE:
3577                 spin_lock_bh(&conn->cmd_lock);
3578                 list_del_init(&cmd->i_conn_node);
3579                 spin_unlock_bh(&conn->cmd_lock);
3580
3581                 iscsit_free_cmd(cmd, false);
3582                 break;
3583         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3584                 iscsit_mod_nopin_response_timer(conn);
3585                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3586                 if (ret < 0)
3587                         goto err;
3588                 break;
3589         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3590                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3591                 if (ret < 0)
3592                         goto err;
3593                 break;
3594         default:
3595                 pr_err("Unknown Opcode: 0x%02x ITT:"
3596                        " 0x%08x, i_state: %d on CID: %hu\n",
3597                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3598                        conn->cid);
3599                 goto err;
3600         }
3601
3602         return 0;
3603
3604 err:
3605         return -1;
3606 }
3607 EXPORT_SYMBOL(iscsit_immediate_queue);
3608
3609 static int
3610 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3611 {
3612         struct iscsit_transport *t = conn->conn_transport;
3613         struct iscsi_queue_req *qr;
3614         struct iscsi_cmd *cmd;
3615         u8 state;
3616         int ret;
3617
3618         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3619                 atomic_set(&conn->check_immediate_queue, 0);
3620                 cmd = qr->cmd;
3621                 state = qr->state;
3622                 kmem_cache_free(lio_qr_cache, qr);
3623
3624                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3625                 if (ret < 0)
3626                         return ret;
3627         }
3628
3629         return 0;
3630 }
3631
3632 int
3633 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3634 {
3635         int ret;
3636
3637 check_rsp_state:
3638         switch (state) {
3639         case ISTATE_SEND_DATAIN:
3640                 ret = iscsit_send_datain(cmd, conn);
3641                 if (ret < 0)
3642                         goto err;
3643                 else if (!ret)
3644                         /* more drs */
3645                         goto check_rsp_state;
3646                 else if (ret == 1) {
3647                         /* all done */
3648                         spin_lock_bh(&cmd->istate_lock);
3649                         cmd->i_state = ISTATE_SENT_STATUS;
3650                         spin_unlock_bh(&cmd->istate_lock);
3651
3652                         if (atomic_read(&conn->check_immediate_queue))
3653                                 return 1;
3654
3655                         return 0;
3656                 } else if (ret == 2) {
3657                         /* Still must send status,
3658                            SCF_TRANSPORT_TASK_SENSE was set */
3659                         spin_lock_bh(&cmd->istate_lock);
3660                         cmd->i_state = ISTATE_SEND_STATUS;
3661                         spin_unlock_bh(&cmd->istate_lock);
3662                         state = ISTATE_SEND_STATUS;
3663                         goto check_rsp_state;
3664                 }
3665
3666                 break;
3667         case ISTATE_SEND_STATUS:
3668         case ISTATE_SEND_STATUS_RECOVERY:
3669                 ret = iscsit_send_response(cmd, conn);
3670                 break;
3671         case ISTATE_SEND_LOGOUTRSP:
3672                 ret = iscsit_send_logout(cmd, conn);
3673                 break;
3674         case ISTATE_SEND_ASYNCMSG:
3675                 ret = iscsit_send_conn_drop_async_message(
3676                         cmd, conn);
3677                 break;
3678         case ISTATE_SEND_NOPIN:
3679                 ret = iscsit_send_nopin(cmd, conn);
3680                 break;
3681         case ISTATE_SEND_REJECT:
3682                 ret = iscsit_send_reject(cmd, conn);
3683                 break;
3684         case ISTATE_SEND_TASKMGTRSP:
3685                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3686                 if (ret != 0)
3687                         break;
3688                 ret = iscsit_tmr_post_handler(cmd, conn);
3689                 if (ret != 0)
3690                         iscsit_fall_back_to_erl0(conn->sess);
3691                 break;
3692         case ISTATE_SEND_TEXTRSP:
3693                 ret = iscsit_send_text_rsp(cmd, conn);
3694                 break;
3695         default:
3696                 pr_err("Unknown Opcode: 0x%02x ITT:"
3697                        " 0x%08x, i_state: %d on CID: %hu\n",
3698                        cmd->iscsi_opcode, cmd->init_task_tag,
3699                        state, conn->cid);
3700                 goto err;
3701         }
3702         if (ret < 0)
3703                 goto err;
3704
3705         switch (state) {
3706         case ISTATE_SEND_LOGOUTRSP:
3707                 if (!iscsit_logout_post_handler(cmd, conn))
3708                         return -ECONNRESET;
3709                 /* fall through */
3710         case ISTATE_SEND_STATUS:
3711         case ISTATE_SEND_ASYNCMSG:
3712         case ISTATE_SEND_NOPIN:
3713         case ISTATE_SEND_STATUS_RECOVERY:
3714         case ISTATE_SEND_TEXTRSP:
3715         case ISTATE_SEND_TASKMGTRSP:
3716         case ISTATE_SEND_REJECT:
3717                 spin_lock_bh(&cmd->istate_lock);
3718                 cmd->i_state = ISTATE_SENT_STATUS;
3719                 spin_unlock_bh(&cmd->istate_lock);
3720                 break;
3721         default:
3722                 pr_err("Unknown Opcode: 0x%02x ITT:"
3723                        " 0x%08x, i_state: %d on CID: %hu\n",
3724                        cmd->iscsi_opcode, cmd->init_task_tag,
3725                        cmd->i_state, conn->cid);
3726                 goto err;
3727         }
3728
3729         if (atomic_read(&conn->check_immediate_queue))
3730                 return 1;
3731
3732         return 0;
3733
3734 err:
3735         return -1;
3736 }
3737 EXPORT_SYMBOL(iscsit_response_queue);
3738
3739 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3740 {
3741         struct iscsit_transport *t = conn->conn_transport;
3742         struct iscsi_queue_req *qr;
3743         struct iscsi_cmd *cmd;
3744         u8 state;
3745         int ret;
3746
3747         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3748                 cmd = qr->cmd;
3749                 state = qr->state;
3750                 kmem_cache_free(lio_qr_cache, qr);
3751
3752                 ret = t->iscsit_response_queue(conn, cmd, state);
3753                 if (ret == 1 || ret < 0)
3754                         return ret;
3755         }
3756
3757         return 0;
3758 }
3759
3760 int iscsi_target_tx_thread(void *arg)
3761 {
3762         int ret = 0;
3763         struct iscsi_conn *conn = arg;
3764         bool conn_freed = false;
3765
3766         /*
3767          * Allow ourselves to be interrupted by SIGINT so that a
3768          * connection recovery / failure event can be triggered externally.
3769          */
3770         allow_signal(SIGINT);
3771
3772         while (!kthread_should_stop()) {
3773                 /*
3774                  * Ensure that both TX and RX per connection kthreads
3775                  * are scheduled to run on the same CPU.
3776                  */
3777                 iscsit_thread_check_cpumask(conn, current, 1);
3778
3779                 wait_event_interruptible(conn->queues_wq,
3780                                          !iscsit_conn_all_queues_empty(conn));
3781
3782                 if (signal_pending(current))
3783                         goto transport_err;
3784
3785 get_immediate:
3786                 ret = iscsit_handle_immediate_queue(conn);
3787                 if (ret < 0)
3788                         goto transport_err;
3789
3790                 ret = iscsit_handle_response_queue(conn);
3791                 if (ret == 1) {
3792                         goto get_immediate;
3793                 } else if (ret == -ECONNRESET) {
3794                         conn_freed = true;
3795                         goto out;
3796                 } else if (ret < 0) {
3797                         goto transport_err;
3798                 }
3799         }
3800
3801 transport_err:
3802         /*
3803          * Avoid the normal connection failure code-path if this connection
3804          * is still within LOGIN mode, and iscsi_np process context is
3805          * responsible for cleaning up the early connection failure.
3806          */
3807         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3808                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3809 out:
3810         if (!conn_freed) {
3811                 while (!kthread_should_stop()) {
3812                         msleep(100);
3813                 }
3814         }
3815         return 0;
3816 }
3817
3818 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3819 {
3820         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3821         struct iscsi_cmd *cmd;
3822         int ret = 0;
3823
3824         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3825         case ISCSI_OP_SCSI_CMD:
3826                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3827                 if (!cmd)
3828                         goto reject;
3829
3830                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3831                 break;
3832         case ISCSI_OP_SCSI_DATA_OUT:
3833                 ret = iscsit_handle_data_out(conn, buf);
3834                 break;
3835         case ISCSI_OP_NOOP_OUT:
3836                 cmd = NULL;
3837                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3838                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3839                         if (!cmd)
3840                                 goto reject;
3841                 }
3842                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3843                 break;
3844         case ISCSI_OP_SCSI_TMFUNC:
3845                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3846                 if (!cmd)
3847                         goto reject;
3848
3849                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3850                 break;
3851         case ISCSI_OP_TEXT:
3852                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3853                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3854                         if (!cmd)
3855                                 goto reject;
3856                 } else {
3857                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3858                         if (!cmd)
3859                                 goto reject;
3860                 }
3861
3862                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3863                 break;
3864         case ISCSI_OP_LOGOUT:
3865                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3866                 if (!cmd)
3867                         goto reject;
3868
3869                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3870                 if (ret > 0)
3871                         wait_for_completion_timeout(&conn->conn_logout_comp,
3872                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3873                 break;
3874         case ISCSI_OP_SNACK:
3875                 ret = iscsit_handle_snack(conn, buf);
3876                 break;
3877         default:
3878                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3879                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3880                         pr_err("Cannot recover from unknown"
3881                         " opcode while ERL=0, closing iSCSI connection.\n");
3882                         return -1;
3883                 }
3884                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3885                        " closing iSCSI connection.\n");
3886                 ret = -1;
3887                 break;
3888         }
3889
3890         return ret;
3891 reject:
3892         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3893 }
3894
3895 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3896 {
3897         bool ret;
3898
3899         spin_lock_bh(&conn->state_lock);
3900         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3901         spin_unlock_bh(&conn->state_lock);
3902
3903         return ret;
3904 }
3905
3906 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3907 {
3908         int ret;
3909         u8 *buffer, opcode;
3910         u32 checksum = 0, digest = 0;
3911         struct kvec iov;
3912
3913         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3914         if (!buffer)
3915                 return;
3916
3917         while (!kthread_should_stop()) {
3918                 /*
3919                  * Ensure that both TX and RX per connection kthreads
3920                  * are scheduled to run on the same CPU.
3921                  */
3922                 iscsit_thread_check_cpumask(conn, current, 0);
3923
3924                 memset(&iov, 0, sizeof(struct kvec));
3925
3926                 iov.iov_base    = buffer;
3927                 iov.iov_len     = ISCSI_HDR_LEN;
3928
3929                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3930                 if (ret != ISCSI_HDR_LEN) {
3931                         iscsit_rx_thread_wait_for_tcp(conn);
3932                         break;
3933                 }
3934
3935                 if (conn->conn_ops->HeaderDigest) {
3936                         iov.iov_base    = &digest;
3937                         iov.iov_len     = ISCSI_CRC_LEN;
3938
3939                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3940                         if (ret != ISCSI_CRC_LEN) {
3941                                 iscsit_rx_thread_wait_for_tcp(conn);
3942                                 break;
3943                         }
3944
3945                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3946                                                   ISCSI_HDR_LEN, 0, NULL,
3947                                                   &checksum);
3948
3949                         if (digest != checksum) {
3950                                 pr_err("HeaderDigest CRC32C failed,"
3951                                         " received 0x%08x, computed 0x%08x\n",
3952                                         digest, checksum);
3953                                 /*
3954                                  * Set the PDU to 0xff so it will intentionally
3955                                  * hit default in the switch below.
3956                                  */
3957                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3958                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3959                         } else {
3960                                 pr_debug("Got HeaderDigest CRC32C"
3961                                                 " 0x%08x\n", checksum);
3962                         }
3963                 }
3964
3965                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3966                         break;
3967
3968                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3969
3970                 if (conn->sess->sess_ops->SessionType &&
3971                    ((!(opcode & ISCSI_OP_TEXT)) ||
3972                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3973                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3974                         " while in Discovery Session, rejecting.\n", opcode);
3975                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3976                                           buffer);
3977                         break;
3978                 }
3979
3980                 ret = iscsi_target_rx_opcode(conn, buffer);
3981                 if (ret < 0)
3982                         break;
3983         }
3984
3985         kfree(buffer);
3986 }
3987
3988 int iscsi_target_rx_thread(void *arg)
3989 {
3990         int rc;
3991         struct iscsi_conn *conn = arg;
3992         bool conn_freed = false;
3993
3994         /*
3995          * Allow ourselves to be interrupted by SIGINT so that a
3996          * connection recovery / failure event can be triggered externally.
3997          */
3998         allow_signal(SIGINT);
3999         /*
4000          * Wait for iscsi_post_login_handler() to complete before allowing
4001          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4002          */
4003         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4004         if (rc < 0 || iscsi_target_check_conn_state(conn))
4005                 goto out;
4006
4007         if (!conn->conn_transport->iscsit_get_rx_pdu)
4008                 return 0;
4009
4010         conn->conn_transport->iscsit_get_rx_pdu(conn);
4011
4012         if (!signal_pending(current))
4013                 atomic_set(&conn->transport_failed, 1);
4014         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4015
4016 out:
4017         if (!conn_freed) {
4018                 while (!kthread_should_stop()) {
4019                         msleep(100);
4020                 }
4021         }
4022
4023         return 0;
4024 }
4025
4026 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4027 {
4028         LIST_HEAD(tmp_list);
4029         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4030         struct iscsi_session *sess = conn->sess;
4031         /*
4032          * We expect this function to only ever be called from either RX or TX
4033          * thread context via iscsit_close_connection() once the other context
4034          * has been reset -> returned sleeping pre-handler state.
4035          */
4036         spin_lock_bh(&conn->cmd_lock);
4037         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4038
4039         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4040                 struct se_cmd *se_cmd = &cmd->se_cmd;
4041
4042                 if (se_cmd->se_tfo != NULL) {
4043                         spin_lock(&se_cmd->t_state_lock);
4044                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4045                         spin_unlock(&se_cmd->t_state_lock);
4046                 }
4047         }
4048         spin_unlock_bh(&conn->cmd_lock);
4049
4050         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4051                 list_del_init(&cmd->i_conn_node);
4052
4053                 iscsit_increment_maxcmdsn(cmd, sess);
4054                 iscsit_free_cmd(cmd, true);
4055
4056         }
4057 }
4058
4059 static void iscsit_stop_timers_for_cmds(
4060         struct iscsi_conn *conn)
4061 {
4062         struct iscsi_cmd *cmd;
4063
4064         spin_lock_bh(&conn->cmd_lock);
4065         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4066                 if (cmd->data_direction == DMA_TO_DEVICE)
4067                         iscsit_stop_dataout_timer(cmd);
4068         }
4069         spin_unlock_bh(&conn->cmd_lock);
4070 }
4071
4072 int iscsit_close_connection(
4073         struct iscsi_conn *conn)
4074 {
4075         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4076         struct iscsi_session    *sess = conn->sess;
4077
4078         pr_debug("Closing iSCSI connection CID %hu on SID:"
4079                 " %u\n", conn->cid, sess->sid);
4080         /*
4081          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4082          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4083          * sleeping and the logout response never got sent because the
4084          * connection failed.
4085          *
4086          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4087          * to signal logout response TX interrupt completion.  Go ahead and skip
4088          * this for iser since isert_rx_opcode() does not wait on logout failure,
4089          * and to avoid iscsi_conn pointer dereference in iser-target code.
4090          */
4091         if (!conn->conn_transport->rdma_shutdown)
4092                 complete(&conn->conn_logout_comp);
4093
4094         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4095                 if (conn->tx_thread &&
4096                     cmpxchg(&conn->tx_thread_active, true, false)) {
4097                         send_sig(SIGINT, conn->tx_thread, 1);
4098                         kthread_stop(conn->tx_thread);
4099                 }
4100         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4101                 if (conn->rx_thread &&
4102                     cmpxchg(&conn->rx_thread_active, true, false)) {
4103                         send_sig(SIGINT, conn->rx_thread, 1);
4104                         kthread_stop(conn->rx_thread);
4105                 }
4106         }
4107
4108         spin_lock(&iscsit_global->ts_bitmap_lock);
4109         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4110                               get_order(1));
4111         spin_unlock(&iscsit_global->ts_bitmap_lock);
4112
4113         iscsit_stop_timers_for_cmds(conn);
4114         iscsit_stop_nopin_response_timer(conn);
4115         iscsit_stop_nopin_timer(conn);
4116
4117         if (conn->conn_transport->iscsit_wait_conn)
4118                 conn->conn_transport->iscsit_wait_conn(conn);
4119
4120         /*
4121          * During Connection recovery drop unacknowledged out of order
4122          * commands for this connection, and prepare the other commands
4123          * for reallegiance.
4124          *
4125          * During normal operation clear the out of order commands (but
4126          * do not free the struct iscsi_ooo_cmdsn's) and release all
4127          * struct iscsi_cmds.
4128          */
4129         if (atomic_read(&conn->connection_recovery)) {
4130                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4131                 iscsit_prepare_cmds_for_reallegiance(conn);
4132         } else {
4133                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4134                 iscsit_release_commands_from_conn(conn);
4135         }
4136         iscsit_free_queue_reqs_for_conn(conn);
4137
4138         /*
4139          * Handle decrementing session or connection usage count if
4140          * a logout response was not able to be sent because the
4141          * connection failed.  Fall back to Session Recovery here.
4142          */
4143         if (atomic_read(&conn->conn_logout_remove)) {
4144                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4145                         iscsit_dec_conn_usage_count(conn);
4146                         iscsit_dec_session_usage_count(sess);
4147                 }
4148                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4149                         iscsit_dec_conn_usage_count(conn);
4150
4151                 atomic_set(&conn->conn_logout_remove, 0);
4152                 atomic_set(&sess->session_reinstatement, 0);
4153                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4154         }
4155
4156         spin_lock_bh(&sess->conn_lock);
4157         list_del(&conn->conn_list);
4158
4159         /*
4160          * Attempt to let the Initiator know this connection failed by
4161          * sending an Connection Dropped Async Message on another
4162          * active connection.
4163          */
4164         if (atomic_read(&conn->connection_recovery))
4165                 iscsit_build_conn_drop_async_message(conn);
4166
4167         spin_unlock_bh(&sess->conn_lock);
4168
4169         /*
4170          * If connection reinstatement is being performed on this connection,
4171          * up the connection reinstatement semaphore that is being blocked on
4172          * in iscsit_cause_connection_reinstatement().
4173          */
4174         spin_lock_bh(&conn->state_lock);
4175         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4176                 spin_unlock_bh(&conn->state_lock);
4177                 complete(&conn->conn_wait_comp);
4178                 wait_for_completion(&conn->conn_post_wait_comp);
4179                 spin_lock_bh(&conn->state_lock);
4180         }
4181
4182         /*
4183          * If connection reinstatement is being performed on this connection
4184          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4185          * connection wait rcfr semaphore that is being blocked on
4186          * an iscsit_connection_reinstatement_rcfr().
4187          */
4188         if (atomic_read(&conn->connection_wait_rcfr)) {
4189                 spin_unlock_bh(&conn->state_lock);
4190                 complete(&conn->conn_wait_rcfr_comp);
4191                 wait_for_completion(&conn->conn_post_wait_comp);
4192                 spin_lock_bh(&conn->state_lock);
4193         }
4194         atomic_set(&conn->connection_reinstatement, 1);
4195         spin_unlock_bh(&conn->state_lock);
4196
4197         /*
4198          * If any other processes are accessing this connection pointer we
4199          * must wait until they have completed.
4200          */
4201         iscsit_check_conn_usage_count(conn);
4202
4203         ahash_request_free(conn->conn_tx_hash);
4204         if (conn->conn_rx_hash) {
4205                 struct crypto_ahash *tfm;
4206
4207                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4208                 ahash_request_free(conn->conn_rx_hash);
4209                 crypto_free_ahash(tfm);
4210         }
4211
4212         if (conn->sock)
4213                 sock_release(conn->sock);
4214
4215         if (conn->conn_transport->iscsit_free_conn)
4216                 conn->conn_transport->iscsit_free_conn(conn);
4217
4218         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4219         conn->conn_state = TARG_CONN_STATE_FREE;
4220         iscsit_free_conn(conn);
4221
4222         spin_lock_bh(&sess->conn_lock);
4223         atomic_dec(&sess->nconn);
4224         pr_debug("Decremented iSCSI connection count to %hu from node:"
4225                 " %s\n", atomic_read(&sess->nconn),
4226                 sess->sess_ops->InitiatorName);
4227         /*
4228          * Make sure that if one connection fails in an non ERL=2 iSCSI
4229          * Session that they all fail.
4230          */
4231         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4232              !atomic_read(&sess->session_logout))
4233                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4234
4235         /*
4236          * If this was not the last connection in the session, and we are
4237          * performing session reinstatement or falling back to ERL=0, call
4238          * iscsit_stop_session() without sleeping to shutdown the other
4239          * active connections.
4240          */
4241         if (atomic_read(&sess->nconn)) {
4242                 if (!atomic_read(&sess->session_reinstatement) &&
4243                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4244                         spin_unlock_bh(&sess->conn_lock);
4245                         return 0;
4246                 }
4247                 if (!atomic_read(&sess->session_stop_active)) {
4248                         atomic_set(&sess->session_stop_active, 1);
4249                         spin_unlock_bh(&sess->conn_lock);
4250                         iscsit_stop_session(sess, 0, 0);
4251                         return 0;
4252                 }
4253                 spin_unlock_bh(&sess->conn_lock);
4254                 return 0;
4255         }
4256
4257         /*
4258          * If this was the last connection in the session and one of the
4259          * following is occurring:
4260          *
4261          * Session Reinstatement is not being performed, and are falling back
4262          * to ERL=0 call iscsit_close_session().
4263          *
4264          * Session Logout was requested.  iscsit_close_session() will be called
4265          * elsewhere.
4266          *
4267          * Session Continuation is not being performed, start the Time2Retain
4268          * handler and check if sleep_on_sess_wait_sem is active.
4269          */
4270         if (!atomic_read(&sess->session_reinstatement) &&
4271              atomic_read(&sess->session_fall_back_to_erl0)) {
4272                 spin_unlock_bh(&sess->conn_lock);
4273                 iscsit_close_session(sess);
4274
4275                 return 0;
4276         } else if (atomic_read(&sess->session_logout)) {
4277                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4278                 sess->session_state = TARG_SESS_STATE_FREE;
4279                 spin_unlock_bh(&sess->conn_lock);
4280
4281                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4282                         complete(&sess->session_wait_comp);
4283
4284                 return 0;
4285         } else {
4286                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4287                 sess->session_state = TARG_SESS_STATE_FAILED;
4288
4289                 if (!atomic_read(&sess->session_continuation)) {
4290                         spin_unlock_bh(&sess->conn_lock);
4291                         iscsit_start_time2retain_handler(sess);
4292                 } else
4293                         spin_unlock_bh(&sess->conn_lock);
4294
4295                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4296                         complete(&sess->session_wait_comp);
4297
4298                 return 0;
4299         }
4300 }
4301
4302 /*
4303  * If the iSCSI Session for the iSCSI Initiator Node exists,
4304  * forcefully shutdown the iSCSI NEXUS.
4305  */
4306 int iscsit_close_session(struct iscsi_session *sess)
4307 {
4308         struct iscsi_portal_group *tpg = sess->tpg;
4309         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4310
4311         if (atomic_read(&sess->nconn)) {
4312                 pr_err("%d connection(s) still exist for iSCSI session"
4313                         " to %s\n", atomic_read(&sess->nconn),
4314                         sess->sess_ops->InitiatorName);
4315                 BUG();
4316         }
4317
4318         spin_lock_bh(&se_tpg->session_lock);
4319         atomic_set(&sess->session_logout, 1);
4320         atomic_set(&sess->session_reinstatement, 1);
4321         iscsit_stop_time2retain_timer(sess);
4322         spin_unlock_bh(&se_tpg->session_lock);
4323
4324         /*
4325          * transport_deregister_session_configfs() will clear the
4326          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4327          * can be setting it again with __transport_register_session() in
4328          * iscsi_post_login_handler() again after the iscsit_stop_session()
4329          * completes in iscsi_np context.
4330          */
4331         transport_deregister_session_configfs(sess->se_sess);
4332
4333         /*
4334          * If any other processes are accessing this session pointer we must
4335          * wait until they have completed.  If we are in an interrupt (the
4336          * time2retain handler) and contain and active session usage count we
4337          * restart the timer and exit.
4338          */
4339         if (!in_interrupt()) {
4340                 if (iscsit_check_session_usage_count(sess) == 1)
4341                         iscsit_stop_session(sess, 1, 1);
4342         } else {
4343                 if (iscsit_check_session_usage_count(sess) == 2) {
4344                         atomic_set(&sess->session_logout, 0);
4345                         iscsit_start_time2retain_handler(sess);
4346                         return 0;
4347                 }
4348         }
4349
4350         transport_deregister_session(sess->se_sess);
4351
4352         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4353                 iscsit_free_connection_recovery_entries(sess);
4354
4355         iscsit_free_all_ooo_cmdsns(sess);
4356
4357         spin_lock_bh(&se_tpg->session_lock);
4358         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4359         sess->session_state = TARG_SESS_STATE_FREE;
4360         pr_debug("Released iSCSI session from node: %s\n",
4361                         sess->sess_ops->InitiatorName);
4362         tpg->nsessions--;
4363         if (tpg->tpg_tiqn)
4364                 tpg->tpg_tiqn->tiqn_nsessions--;
4365
4366         pr_debug("Decremented number of active iSCSI Sessions on"
4367                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4368
4369         ida_free(&sess_ida, sess->session_index);
4370         kfree(sess->sess_ops);
4371         sess->sess_ops = NULL;
4372         spin_unlock_bh(&se_tpg->session_lock);
4373
4374         kfree(sess);
4375         return 0;
4376 }
4377
4378 static void iscsit_logout_post_handler_closesession(
4379         struct iscsi_conn *conn)
4380 {
4381         struct iscsi_session *sess = conn->sess;
4382         int sleep = 1;
4383         /*
4384          * Traditional iscsi/tcp will invoke this logic from TX thread
4385          * context during session logout, so clear tx_thread_active and
4386          * sleep if iscsit_close_connection() has not already occured.
4387          *
4388          * Since iser-target invokes this logic from it's own workqueue,
4389          * always sleep waiting for RX/TX thread shutdown to complete
4390          * within iscsit_close_connection().
4391          */
4392         if (!conn->conn_transport->rdma_shutdown) {
4393                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4394                 if (!sleep)
4395                         return;
4396         }
4397
4398         atomic_set(&conn->conn_logout_remove, 0);
4399         complete(&conn->conn_logout_comp);
4400
4401         iscsit_dec_conn_usage_count(conn);
4402         iscsit_stop_session(sess, sleep, sleep);
4403         iscsit_dec_session_usage_count(sess);
4404         iscsit_close_session(sess);
4405 }
4406
4407 static void iscsit_logout_post_handler_samecid(
4408         struct iscsi_conn *conn)
4409 {
4410         int sleep = 1;
4411
4412         if (!conn->conn_transport->rdma_shutdown) {
4413                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4414                 if (!sleep)
4415                         return;
4416         }
4417
4418         atomic_set(&conn->conn_logout_remove, 0);
4419         complete(&conn->conn_logout_comp);
4420
4421         iscsit_cause_connection_reinstatement(conn, sleep);
4422         iscsit_dec_conn_usage_count(conn);
4423 }
4424
4425 static void iscsit_logout_post_handler_diffcid(
4426         struct iscsi_conn *conn,
4427         u16 cid)
4428 {
4429         struct iscsi_conn *l_conn;
4430         struct iscsi_session *sess = conn->sess;
4431         bool conn_found = false;
4432
4433         if (!sess)
4434                 return;
4435
4436         spin_lock_bh(&sess->conn_lock);
4437         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4438                 if (l_conn->cid == cid) {
4439                         iscsit_inc_conn_usage_count(l_conn);
4440                         conn_found = true;
4441                         break;
4442                 }
4443         }
4444         spin_unlock_bh(&sess->conn_lock);
4445
4446         if (!conn_found)
4447                 return;
4448
4449         if (l_conn->sock)
4450                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4451
4452         spin_lock_bh(&l_conn->state_lock);
4453         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4454         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4455         spin_unlock_bh(&l_conn->state_lock);
4456
4457         iscsit_cause_connection_reinstatement(l_conn, 1);
4458         iscsit_dec_conn_usage_count(l_conn);
4459 }
4460
4461 /*
4462  *      Return of 0 causes the TX thread to restart.
4463  */
4464 int iscsit_logout_post_handler(
4465         struct iscsi_cmd *cmd,
4466         struct iscsi_conn *conn)
4467 {
4468         int ret = 0;
4469
4470         switch (cmd->logout_reason) {
4471         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4472                 switch (cmd->logout_response) {
4473                 case ISCSI_LOGOUT_SUCCESS:
4474                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4475                 default:
4476                         iscsit_logout_post_handler_closesession(conn);
4477                         break;
4478                 }
4479                 ret = 0;
4480                 break;
4481         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4482                 if (conn->cid == cmd->logout_cid) {
4483                         switch (cmd->logout_response) {
4484                         case ISCSI_LOGOUT_SUCCESS:
4485                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4486                         default:
4487                                 iscsit_logout_post_handler_samecid(conn);
4488                                 break;
4489                         }
4490                         ret = 0;
4491                 } else {
4492                         switch (cmd->logout_response) {
4493                         case ISCSI_LOGOUT_SUCCESS:
4494                                 iscsit_logout_post_handler_diffcid(conn,
4495                                         cmd->logout_cid);
4496                                 break;
4497                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4498                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4499                         default:
4500                                 break;
4501                         }
4502                         ret = 1;
4503                 }
4504                 break;
4505         case ISCSI_LOGOUT_REASON_RECOVERY:
4506                 switch (cmd->logout_response) {
4507                 case ISCSI_LOGOUT_SUCCESS:
4508                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4509                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4510                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4511                 default:
4512                         break;
4513                 }
4514                 ret = 1;
4515                 break;
4516         default:
4517                 break;
4518
4519         }
4520         return ret;
4521 }
4522 EXPORT_SYMBOL(iscsit_logout_post_handler);
4523
4524 void iscsit_fail_session(struct iscsi_session *sess)
4525 {
4526         struct iscsi_conn *conn;
4527
4528         spin_lock_bh(&sess->conn_lock);
4529         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4530                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4531                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4532         }
4533         spin_unlock_bh(&sess->conn_lock);
4534
4535         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4536         sess->session_state = TARG_SESS_STATE_FAILED;
4537 }
4538
4539 int iscsit_free_session(struct iscsi_session *sess)
4540 {
4541         u16 conn_count = atomic_read(&sess->nconn);
4542         struct iscsi_conn *conn, *conn_tmp = NULL;
4543         int is_last;
4544
4545         spin_lock_bh(&sess->conn_lock);
4546         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4547
4548         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4549                         conn_list) {
4550                 if (conn_count == 0)
4551                         break;
4552
4553                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4554                         is_last = 1;
4555                 } else {
4556                         iscsit_inc_conn_usage_count(conn_tmp);
4557                         is_last = 0;
4558                 }
4559                 iscsit_inc_conn_usage_count(conn);
4560
4561                 spin_unlock_bh(&sess->conn_lock);
4562                 iscsit_cause_connection_reinstatement(conn, 1);
4563                 spin_lock_bh(&sess->conn_lock);
4564
4565                 iscsit_dec_conn_usage_count(conn);
4566                 if (is_last == 0)
4567                         iscsit_dec_conn_usage_count(conn_tmp);
4568
4569                 conn_count--;
4570         }
4571
4572         if (atomic_read(&sess->nconn)) {
4573                 spin_unlock_bh(&sess->conn_lock);
4574                 wait_for_completion(&sess->session_wait_comp);
4575         } else
4576                 spin_unlock_bh(&sess->conn_lock);
4577
4578         iscsit_close_session(sess);
4579         return 0;
4580 }
4581
4582 void iscsit_stop_session(
4583         struct iscsi_session *sess,
4584         int session_sleep,
4585         int connection_sleep)
4586 {
4587         u16 conn_count = atomic_read(&sess->nconn);
4588         struct iscsi_conn *conn, *conn_tmp = NULL;
4589         int is_last;
4590
4591         spin_lock_bh(&sess->conn_lock);
4592         if (session_sleep)
4593                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4594
4595         if (connection_sleep) {
4596                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4597                                 conn_list) {
4598                         if (conn_count == 0)
4599                                 break;
4600
4601                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4602                                 is_last = 1;
4603                         } else {
4604                                 iscsit_inc_conn_usage_count(conn_tmp);
4605                                 is_last = 0;
4606                         }
4607                         iscsit_inc_conn_usage_count(conn);
4608
4609                         spin_unlock_bh(&sess->conn_lock);
4610                         iscsit_cause_connection_reinstatement(conn, 1);
4611                         spin_lock_bh(&sess->conn_lock);
4612
4613                         iscsit_dec_conn_usage_count(conn);
4614                         if (is_last == 0)
4615                                 iscsit_dec_conn_usage_count(conn_tmp);
4616                         conn_count--;
4617                 }
4618         } else {
4619                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4620                         iscsit_cause_connection_reinstatement(conn, 0);
4621         }
4622
4623         if (session_sleep && atomic_read(&sess->nconn)) {
4624                 spin_unlock_bh(&sess->conn_lock);
4625                 wait_for_completion(&sess->session_wait_comp);
4626         } else
4627                 spin_unlock_bh(&sess->conn_lock);
4628 }
4629
4630 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4631 {
4632         struct iscsi_session *sess;
4633         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4634         struct se_session *se_sess, *se_sess_tmp;
4635         LIST_HEAD(free_list);
4636         int session_count = 0;
4637
4638         spin_lock_bh(&se_tpg->session_lock);
4639         if (tpg->nsessions && !force) {
4640                 spin_unlock_bh(&se_tpg->session_lock);
4641                 return -1;
4642         }
4643
4644         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4645                         sess_list) {
4646                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4647
4648                 spin_lock(&sess->conn_lock);
4649                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4650                     atomic_read(&sess->session_logout) ||
4651                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4652                         spin_unlock(&sess->conn_lock);
4653                         continue;
4654                 }
4655                 atomic_set(&sess->session_reinstatement, 1);
4656                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4657                 spin_unlock(&sess->conn_lock);
4658
4659                 list_move_tail(&se_sess->sess_list, &free_list);
4660         }
4661         spin_unlock_bh(&se_tpg->session_lock);
4662
4663         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4664                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4665
4666                 iscsit_free_session(sess);
4667                 session_count++;
4668         }
4669
4670         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4671                         " Group: %hu\n", session_count, tpg->tpgt);
4672         return 0;
4673 }
4674
4675 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4676 MODULE_VERSION("4.1.x");
4677 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4678 MODULE_LICENSE("GPL");
4679
4680 module_init(iscsi_target_init_module);
4681 module_exit(iscsi_target_cleanup_module);