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("nable 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                         transport_check_aborted_status(se_cmd,
1497                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1498                         return iscsit_dump_data_payload(conn, payload_length, 1);
1499                 }
1500         } else {
1501                 /*
1502                  * For the normal solicited data path:
1503                  *
1504                  * Check for a delayed TASK_ABORTED status and dump any
1505                  * incoming data out payload if one exists.  Also, when the
1506                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1507                  * data out sequence, we decrement outstanding_r2ts.  Once
1508                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1509                  * TASK_ABORTED status.
1510                  */
1511                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1512                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1513                                 if (--cmd->outstanding_r2ts < 1) {
1514                                         iscsit_stop_dataout_timer(cmd);
1515                                         transport_check_aborted_status(
1516                                                         se_cmd, 1);
1517                                 }
1518
1519                         return iscsit_dump_data_payload(conn, payload_length, 1);
1520                 }
1521         }
1522         /*
1523          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1524          * within-command recovery checks before receiving the payload.
1525          */
1526         rc = iscsit_check_pre_dataout(cmd, buf);
1527         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1528                 return 0;
1529         else if (rc == DATAOUT_CANNOT_RECOVER)
1530                 return -1;
1531         *success = true;
1532         return 0;
1533 }
1534 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1535
1536 int
1537 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1538                          struct iscsi_cmd **out_cmd)
1539 {
1540         struct iscsi_data *hdr = buf;
1541         struct iscsi_cmd *cmd;
1542         u32 payload_length = ntoh24(hdr->dlength);
1543         int rc;
1544         bool success = false;
1545
1546         if (!payload_length) {
1547                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1548                 return 0;
1549         }
1550
1551         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1552                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1553                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1554                         conn->conn_ops->MaxXmitDataSegmentLength);
1555                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1556         }
1557
1558         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1559         if (!cmd)
1560                 return 0;
1561
1562         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1563
1564         if (success)
1565                 *out_cmd = cmd;
1566
1567         return rc;
1568 }
1569 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1570
1571 static int
1572 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1573                    struct iscsi_data *hdr)
1574 {
1575         struct kvec *iov;
1576         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1577         u32 payload_length = ntoh24(hdr->dlength);
1578         int iov_ret, data_crc_failed = 0;
1579
1580         rx_size += payload_length;
1581         iov = &cmd->iov_data[0];
1582
1583         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1584                                    payload_length);
1585         if (iov_ret < 0)
1586                 return -1;
1587
1588         iov_count += iov_ret;
1589
1590         padding = ((-payload_length) & 3);
1591         if (padding != 0) {
1592                 iov[iov_count].iov_base = cmd->pad_bytes;
1593                 iov[iov_count++].iov_len = padding;
1594                 rx_size += padding;
1595                 pr_debug("Receiving %u padding bytes.\n", padding);
1596         }
1597
1598         if (conn->conn_ops->DataDigest) {
1599                 iov[iov_count].iov_base = &checksum;
1600                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1601                 rx_size += ISCSI_CRC_LEN;
1602         }
1603
1604         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1605
1606         iscsit_unmap_iovec(cmd);
1607
1608         if (rx_got != rx_size)
1609                 return -1;
1610
1611         if (conn->conn_ops->DataDigest) {
1612                 u32 data_crc;
1613
1614                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1615                                                     be32_to_cpu(hdr->offset),
1616                                                     payload_length, padding,
1617                                                     cmd->pad_bytes);
1618
1619                 if (checksum != data_crc) {
1620                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1621                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1622                                 " does not match computed 0x%08x\n",
1623                                 hdr->itt, hdr->offset, payload_length,
1624                                 hdr->datasn, checksum, data_crc);
1625                         data_crc_failed = 1;
1626                 } else {
1627                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1628                                 " %u bytes of Data Out\n", checksum,
1629                                 payload_length);
1630                 }
1631         }
1632
1633         return data_crc_failed;
1634 }
1635
1636 int
1637 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1638                              bool data_crc_failed)
1639 {
1640         struct iscsi_conn *conn = cmd->conn;
1641         int rc, ooo_cmdsn;
1642         /*
1643          * Increment post receive data and CRC values or perform
1644          * within-command recovery.
1645          */
1646         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1647         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1648                 return 0;
1649         else if (rc == DATAOUT_SEND_R2T) {
1650                 iscsit_set_dataout_sequence_values(cmd);
1651                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1652         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1653                 /*
1654                  * Handle extra special case for out of order
1655                  * Unsolicited Data Out.
1656                  */
1657                 spin_lock_bh(&cmd->istate_lock);
1658                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1659                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1660                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1661                 spin_unlock_bh(&cmd->istate_lock);
1662
1663                 iscsit_stop_dataout_timer(cmd);
1664                 if (ooo_cmdsn)
1665                         return 0;
1666                 target_execute_cmd(&cmd->se_cmd);
1667                 return 0;
1668         } else /* DATAOUT_CANNOT_RECOVER */
1669                 return -1;
1670
1671         return 0;
1672 }
1673 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1674
1675 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1676 {
1677         struct iscsi_cmd *cmd = NULL;
1678         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1679         int rc;
1680         bool data_crc_failed = false;
1681
1682         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1683         if (rc < 0)
1684                 return 0;
1685         else if (!cmd)
1686                 return 0;
1687
1688         rc = iscsit_get_dataout(conn, cmd, hdr);
1689         if (rc < 0)
1690                 return rc;
1691         else if (rc > 0)
1692                 data_crc_failed = true;
1693
1694         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1695 }
1696
1697 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1698                          struct iscsi_nopout *hdr)
1699 {
1700         u32 payload_length = ntoh24(hdr->dlength);
1701
1702         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1703                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1704                 if (!cmd)
1705                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1706                                                  (unsigned char *)hdr);
1707
1708                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1709                                          (unsigned char *)hdr);
1710         }
1711
1712         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1713                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1714                         " not set, protocol error.\n");
1715                 if (!cmd)
1716                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1717                                                  (unsigned char *)hdr);
1718
1719                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1720                                          (unsigned char *)hdr);
1721         }
1722
1723         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1724                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1725                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1726                         " error.\n", payload_length,
1727                         conn->conn_ops->MaxXmitDataSegmentLength);
1728                 if (!cmd)
1729                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1730                                                  (unsigned char *)hdr);
1731
1732                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1733                                          (unsigned char *)hdr);
1734         }
1735
1736         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1737                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1738                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1739                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1740                 payload_length);
1741         /*
1742          * This is not a response to a Unsolicited NopIN, which means
1743          * it can either be a NOPOUT ping request (with a valid ITT),
1744          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1745          * Either way, make sure we allocate an struct iscsi_cmd, as both
1746          * can contain ping data.
1747          */
1748         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1749                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1750                 cmd->i_state            = ISTATE_SEND_NOPIN;
1751                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1752                                                 1 : 0);
1753                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1754                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1755                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1756                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1757                 cmd->data_direction     = DMA_NONE;
1758         }
1759
1760         return 0;
1761 }
1762 EXPORT_SYMBOL(iscsit_setup_nop_out);
1763
1764 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1765                            struct iscsi_nopout *hdr)
1766 {
1767         struct iscsi_cmd *cmd_p = NULL;
1768         int cmdsn_ret = 0;
1769         /*
1770          * Initiator is expecting a NopIN ping reply..
1771          */
1772         if (hdr->itt != RESERVED_ITT) {
1773                 if (!cmd)
1774                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1775                                                 (unsigned char *)hdr);
1776
1777                 spin_lock_bh(&conn->cmd_lock);
1778                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1779                 spin_unlock_bh(&conn->cmd_lock);
1780
1781                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1782
1783                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1784                         iscsit_add_cmd_to_response_queue(cmd, conn,
1785                                                          cmd->i_state);
1786                         return 0;
1787                 }
1788
1789                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1790                                 (unsigned char *)hdr, hdr->cmdsn);
1791                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1792                         return 0;
1793                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1794                         return -1;
1795
1796                 return 0;
1797         }
1798         /*
1799          * This was a response to a unsolicited NOPIN ping.
1800          */
1801         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1802                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1803                 if (!cmd_p)
1804                         return -EINVAL;
1805
1806                 iscsit_stop_nopin_response_timer(conn);
1807
1808                 cmd_p->i_state = ISTATE_REMOVE;
1809                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1810
1811                 iscsit_start_nopin_timer(conn);
1812                 return 0;
1813         }
1814         /*
1815          * Otherwise, initiator is not expecting a NOPIN is response.
1816          * Just ignore for now.
1817          */
1818
1819         if (cmd)
1820                 iscsit_free_cmd(cmd, false);
1821
1822         return 0;
1823 }
1824 EXPORT_SYMBOL(iscsit_process_nop_out);
1825
1826 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1827                                  unsigned char *buf)
1828 {
1829         unsigned char *ping_data = NULL;
1830         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1831         struct kvec *iov = NULL;
1832         u32 payload_length = ntoh24(hdr->dlength);
1833         int ret;
1834
1835         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1836         if (ret < 0)
1837                 return 0;
1838         /*
1839          * Handle NOP-OUT payload for traditional iSCSI sockets
1840          */
1841         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1842                 u32 checksum, data_crc, padding = 0;
1843                 int niov = 0, rx_got, rx_size = payload_length;
1844
1845                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1846                 if (!ping_data) {
1847                         ret = -1;
1848                         goto out;
1849                 }
1850
1851                 iov = &cmd->iov_misc[0];
1852                 iov[niov].iov_base      = ping_data;
1853                 iov[niov++].iov_len     = payload_length;
1854
1855                 padding = ((-payload_length) & 3);
1856                 if (padding != 0) {
1857                         pr_debug("Receiving %u additional bytes"
1858                                 " for padding.\n", padding);
1859                         iov[niov].iov_base      = &cmd->pad_bytes;
1860                         iov[niov++].iov_len     = padding;
1861                         rx_size += padding;
1862                 }
1863                 if (conn->conn_ops->DataDigest) {
1864                         iov[niov].iov_base      = &checksum;
1865                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1866                         rx_size += ISCSI_CRC_LEN;
1867                 }
1868
1869                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1870                 if (rx_got != rx_size) {
1871                         ret = -1;
1872                         goto out;
1873                 }
1874
1875                 if (conn->conn_ops->DataDigest) {
1876                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1877                                                   payload_length, padding,
1878                                                   cmd->pad_bytes, &data_crc);
1879
1880                         if (checksum != data_crc) {
1881                                 pr_err("Ping data CRC32C DataDigest"
1882                                 " 0x%08x does not match computed 0x%08x\n",
1883                                         checksum, data_crc);
1884                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1885                                         pr_err("Unable to recover from"
1886                                         " NOPOUT Ping DataCRC failure while in"
1887                                                 " ERL=0.\n");
1888                                         ret = -1;
1889                                         goto out;
1890                                 } else {
1891                                         /*
1892                                          * Silently drop this PDU and let the
1893                                          * initiator plug the CmdSN gap.
1894                                          */
1895                                         pr_debug("Dropping NOPOUT"
1896                                         " Command CmdSN: 0x%08x due to"
1897                                         " DataCRC error.\n", hdr->cmdsn);
1898                                         ret = 0;
1899                                         goto out;
1900                                 }
1901                         } else {
1902                                 pr_debug("Got CRC32C DataDigest"
1903                                 " 0x%08x for %u bytes of ping data.\n",
1904                                         checksum, payload_length);
1905                         }
1906                 }
1907
1908                 ping_data[payload_length] = '\0';
1909                 /*
1910                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1911                  */
1912                 cmd->buf_ptr = ping_data;
1913                 cmd->buf_ptr_size = payload_length;
1914
1915                 pr_debug("Got %u bytes of NOPOUT ping"
1916                         " data.\n", payload_length);
1917                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1918         }
1919
1920         return iscsit_process_nop_out(conn, cmd, hdr);
1921 out:
1922         if (cmd)
1923                 iscsit_free_cmd(cmd, false);
1924
1925         kfree(ping_data);
1926         return ret;
1927 }
1928
1929 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1930 {
1931         switch (iscsi_tmf) {
1932         case ISCSI_TM_FUNC_ABORT_TASK:
1933                 return TMR_ABORT_TASK;
1934         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1935                 return TMR_ABORT_TASK_SET;
1936         case ISCSI_TM_FUNC_CLEAR_ACA:
1937                 return TMR_CLEAR_ACA;
1938         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1939                 return TMR_CLEAR_TASK_SET;
1940         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1941                 return TMR_LUN_RESET;
1942         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1943                 return TMR_TARGET_WARM_RESET;
1944         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1945                 return TMR_TARGET_COLD_RESET;
1946         default:
1947                 return TMR_UNKNOWN;
1948         }
1949 }
1950
1951 int
1952 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1953                            unsigned char *buf)
1954 {
1955         struct se_tmr_req *se_tmr;
1956         struct iscsi_tmr_req *tmr_req;
1957         struct iscsi_tm *hdr;
1958         int out_of_order_cmdsn = 0, ret;
1959         u8 function, tcm_function = TMR_UNKNOWN;
1960
1961         hdr                     = (struct iscsi_tm *) buf;
1962         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1963         function = hdr->flags;
1964
1965         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1966                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1967                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1968                 hdr->rtt, hdr->refcmdsn, conn->cid);
1969
1970         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1971             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1972              hdr->rtt != RESERVED_ITT)) {
1973                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1974                 hdr->rtt = RESERVED_ITT;
1975         }
1976
1977         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1978                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1979                 pr_err("Task Management Request TASK_REASSIGN not"
1980                         " issued as immediate command, bad iSCSI Initiator"
1981                                 "implementation\n");
1982                 return iscsit_add_reject_cmd(cmd,
1983                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1984         }
1985         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1986             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1987                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1988
1989         cmd->data_direction = DMA_NONE;
1990         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1991         if (!cmd->tmr_req) {
1992                 return iscsit_add_reject_cmd(cmd,
1993                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1994                                              buf);
1995         }
1996
1997         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1998                               conn->sess->se_sess, 0, DMA_NONE,
1999                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2000
2001         target_get_sess_cmd(&cmd->se_cmd, true);
2002
2003         /*
2004          * TASK_REASSIGN for ERL=2 / connection stays inside of
2005          * LIO-Target $FABRIC_MOD
2006          */
2007         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2008                 tcm_function = iscsit_convert_tmf(function);
2009                 if (tcm_function == TMR_UNKNOWN) {
2010                         pr_err("Unknown iSCSI TMR Function:"
2011                                " 0x%02x\n", function);
2012                         return iscsit_add_reject_cmd(cmd,
2013                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2014                 }
2015         }
2016         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2017                                  GFP_KERNEL);
2018         if (ret < 0)
2019                 return iscsit_add_reject_cmd(cmd,
2020                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2021
2022         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2023
2024         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2025         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2026         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2027         cmd->init_task_tag      = hdr->itt;
2028         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2029         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2030         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2031         se_tmr                  = cmd->se_cmd.se_tmr_req;
2032         tmr_req                 = cmd->tmr_req;
2033         /*
2034          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2035          */
2036         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2037                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2038                                                scsilun_to_int(&hdr->lun));
2039                 if (ret < 0) {
2040                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2041                         goto attach;
2042                 }
2043         }
2044
2045         switch (function) {
2046         case ISCSI_TM_FUNC_ABORT_TASK:
2047                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2048                 if (se_tmr->response)
2049                         goto attach;
2050                 break;
2051         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2052         case ISCSI_TM_FUNC_CLEAR_ACA:
2053         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2054         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2055                 break;
2056         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2057                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2058                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2059                         goto attach;
2060                 }
2061                 break;
2062         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2063                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2064                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2065                         goto attach;
2066                 }
2067                 break;
2068         case ISCSI_TM_FUNC_TASK_REASSIGN:
2069                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2070                 /*
2071                  * Perform sanity checks on the ExpDataSN only if the
2072                  * TASK_REASSIGN was successful.
2073                  */
2074                 if (se_tmr->response)
2075                         break;
2076
2077                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2078                         return iscsit_add_reject_cmd(cmd,
2079                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2080                 break;
2081         default:
2082                 pr_err("Unknown TMR function: 0x%02x, protocol"
2083                         " error.\n", function);
2084                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2085                 goto attach;
2086         }
2087
2088         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2089             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2090                 se_tmr->call_transport = 1;
2091 attach:
2092         spin_lock_bh(&conn->cmd_lock);
2093         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2094         spin_unlock_bh(&conn->cmd_lock);
2095
2096         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2097                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2098                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2099                         out_of_order_cmdsn = 1;
2100                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2101                         target_put_sess_cmd(&cmd->se_cmd);
2102                         return 0;
2103                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2104                         return -1;
2105                 }
2106         }
2107         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2108
2109         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2110                 return 0;
2111         /*
2112          * Found the referenced task, send to transport for processing.
2113          */
2114         if (se_tmr->call_transport)
2115                 return transport_generic_handle_tmr(&cmd->se_cmd);
2116
2117         /*
2118          * Could not find the referenced LUN, task, or Task Management
2119          * command not authorized or supported.  Change state and
2120          * let the tx_thread send the response.
2121          *
2122          * For connection recovery, this is also the default action for
2123          * TMR TASK_REASSIGN.
2124          */
2125         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2126         target_put_sess_cmd(&cmd->se_cmd);
2127         return 0;
2128 }
2129 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2130
2131 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2132 int
2133 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2134                       struct iscsi_text *hdr)
2135 {
2136         u32 payload_length = ntoh24(hdr->dlength);
2137
2138         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2139                 pr_err("Unable to accept text parameter length: %u"
2140                         "greater than MaxXmitDataSegmentLength %u.\n",
2141                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2142                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2143                                          (unsigned char *)hdr);
2144         }
2145
2146         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2147              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2148                 pr_err("Multi sequence text commands currently not supported\n");
2149                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2150                                         (unsigned char *)hdr);
2151         }
2152
2153         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2154                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2155                 hdr->exp_statsn, payload_length);
2156
2157         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2158         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2159         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2160         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2161         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2162         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2163         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2164         cmd->data_direction     = DMA_NONE;
2165         kfree(cmd->text_in_ptr);
2166         cmd->text_in_ptr        = NULL;
2167
2168         return 0;
2169 }
2170 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2171
2172 int
2173 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2174                         struct iscsi_text *hdr)
2175 {
2176         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2177         int cmdsn_ret;
2178
2179         if (!text_in) {
2180                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2181                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2182                         pr_err("Unable to locate text_in buffer for sendtargets"
2183                                " discovery\n");
2184                         goto reject;
2185                 }
2186                 goto empty_sendtargets;
2187         }
2188         if (strncmp("SendTargets", text_in, 11) != 0) {
2189                 pr_err("Received Text Data that is not"
2190                         " SendTargets, cannot continue.\n");
2191                 goto reject;
2192         }
2193         text_ptr = strchr(text_in, '=');
2194         if (!text_ptr) {
2195                 pr_err("No \"=\" separator found in Text Data,"
2196                         "  cannot continue.\n");
2197                 goto reject;
2198         }
2199         if (!strncmp("=All", text_ptr, 4)) {
2200                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2201         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2202                    !strncmp("=eui.", text_ptr, 5)) {
2203                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2204         } else {
2205                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2206                 goto reject;
2207         }
2208
2209         spin_lock_bh(&conn->cmd_lock);
2210         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2211         spin_unlock_bh(&conn->cmd_lock);
2212
2213 empty_sendtargets:
2214         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2215
2216         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2217                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2218                                 (unsigned char *)hdr, hdr->cmdsn);
2219                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2220                         return -1;
2221
2222                 return 0;
2223         }
2224
2225         return iscsit_execute_cmd(cmd, 0);
2226
2227 reject:
2228         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2229                                  (unsigned char *)hdr);
2230 }
2231 EXPORT_SYMBOL(iscsit_process_text_cmd);
2232
2233 static int
2234 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2235                        unsigned char *buf)
2236 {
2237         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2238         char *text_in = NULL;
2239         u32 payload_length = ntoh24(hdr->dlength);
2240         int rx_size, rc;
2241
2242         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2243         if (rc < 0)
2244                 return 0;
2245
2246         rx_size = payload_length;
2247         if (payload_length) {
2248                 u32 checksum = 0, data_crc = 0;
2249                 u32 padding = 0, pad_bytes = 0;
2250                 int niov = 0, rx_got;
2251                 struct kvec iov[3];
2252
2253                 text_in = kzalloc(payload_length, GFP_KERNEL);
2254                 if (!text_in)
2255                         goto reject;
2256
2257                 cmd->text_in_ptr = text_in;
2258
2259                 memset(iov, 0, 3 * sizeof(struct kvec));
2260                 iov[niov].iov_base      = text_in;
2261                 iov[niov++].iov_len     = payload_length;
2262
2263                 padding = ((-payload_length) & 3);
2264                 if (padding != 0) {
2265                         iov[niov].iov_base = &pad_bytes;
2266                         iov[niov++].iov_len  = padding;
2267                         rx_size += padding;
2268                         pr_debug("Receiving %u additional bytes"
2269                                         " for padding.\n", padding);
2270                 }
2271                 if (conn->conn_ops->DataDigest) {
2272                         iov[niov].iov_base      = &checksum;
2273                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2274                         rx_size += ISCSI_CRC_LEN;
2275                 }
2276
2277                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2278                 if (rx_got != rx_size)
2279                         goto reject;
2280
2281                 if (conn->conn_ops->DataDigest) {
2282                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2283                                                   payload_length, padding,
2284                                                   &pad_bytes, &data_crc);
2285
2286                         if (checksum != data_crc) {
2287                                 pr_err("Text data CRC32C DataDigest"
2288                                         " 0x%08x does not match computed"
2289                                         " 0x%08x\n", checksum, data_crc);
2290                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2291                                         pr_err("Unable to recover from"
2292                                         " Text Data digest failure while in"
2293                                                 " ERL=0.\n");
2294                                         goto reject;
2295                                 } else {
2296                                         /*
2297                                          * Silently drop this PDU and let the
2298                                          * initiator plug the CmdSN gap.
2299                                          */
2300                                         pr_debug("Dropping Text"
2301                                         " Command CmdSN: 0x%08x due to"
2302                                         " DataCRC error.\n", hdr->cmdsn);
2303                                         kfree(text_in);
2304                                         return 0;
2305                                 }
2306                         } else {
2307                                 pr_debug("Got CRC32C DataDigest"
2308                                         " 0x%08x for %u bytes of text data.\n",
2309                                                 checksum, payload_length);
2310                         }
2311                 }
2312                 text_in[payload_length - 1] = '\0';
2313                 pr_debug("Successfully read %d bytes of text"
2314                                 " data.\n", payload_length);
2315         }
2316
2317         return iscsit_process_text_cmd(conn, cmd, hdr);
2318
2319 reject:
2320         kfree(cmd->text_in_ptr);
2321         cmd->text_in_ptr = NULL;
2322         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2323 }
2324
2325 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327         struct iscsi_conn *conn_p;
2328         struct iscsi_session *sess = conn->sess;
2329
2330         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2331                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2332
2333         atomic_set(&sess->session_logout, 1);
2334         atomic_set(&conn->conn_logout_remove, 1);
2335         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2336
2337         iscsit_inc_conn_usage_count(conn);
2338         iscsit_inc_session_usage_count(sess);
2339
2340         spin_lock_bh(&sess->conn_lock);
2341         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2342                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2343                         continue;
2344
2345                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2346                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2347         }
2348         spin_unlock_bh(&sess->conn_lock);
2349
2350         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2351
2352         return 0;
2353 }
2354
2355 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2356 {
2357         struct iscsi_conn *l_conn;
2358         struct iscsi_session *sess = conn->sess;
2359
2360         pr_debug("Received logout request CLOSECONNECTION for CID:"
2361                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2362
2363         /*
2364          * A Logout Request with a CLOSECONNECTION reason code for a CID
2365          * can arrive on a connection with a differing CID.
2366          */
2367         if (conn->cid == cmd->logout_cid) {
2368                 spin_lock_bh(&conn->state_lock);
2369                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2370                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371
2372                 atomic_set(&conn->conn_logout_remove, 1);
2373                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2374                 iscsit_inc_conn_usage_count(conn);
2375
2376                 spin_unlock_bh(&conn->state_lock);
2377         } else {
2378                 /*
2379                  * Handle all different cid CLOSECONNECTION requests in
2380                  * iscsit_logout_post_handler_diffcid() as to give enough
2381                  * time for any non immediate command's CmdSN to be
2382                  * acknowledged on the connection in question.
2383                  *
2384                  * Here we simply make sure the CID is still around.
2385                  */
2386                 l_conn = iscsit_get_conn_from_cid(sess,
2387                                 cmd->logout_cid);
2388                 if (!l_conn) {
2389                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2390                         iscsit_add_cmd_to_response_queue(cmd, conn,
2391                                         cmd->i_state);
2392                         return 0;
2393                 }
2394
2395                 iscsit_dec_conn_usage_count(l_conn);
2396         }
2397
2398         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2399
2400         return 0;
2401 }
2402
2403 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2404 {
2405         struct iscsi_session *sess = conn->sess;
2406
2407         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2408                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2409
2410         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2411                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412                         " while ERL!=2.\n");
2413                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2414                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415                 return 0;
2416         }
2417
2418         if (conn->cid == cmd->logout_cid) {
2419                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2420                         " with CID: %hu on CID: %hu, implementation error.\n",
2421                                 cmd->logout_cid, conn->cid);
2422                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2423                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424                 return 0;
2425         }
2426
2427         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428
2429         return 0;
2430 }
2431
2432 int
2433 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434                         unsigned char *buf)
2435 {
2436         int cmdsn_ret, logout_remove = 0;
2437         u8 reason_code = 0;
2438         struct iscsi_logout *hdr;
2439         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2440
2441         hdr                     = (struct iscsi_logout *) buf;
2442         reason_code             = (hdr->flags & 0x7f);
2443
2444         if (tiqn) {
2445                 spin_lock(&tiqn->logout_stats.lock);
2446                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2447                         tiqn->logout_stats.normal_logouts++;
2448                 else
2449                         tiqn->logout_stats.abnormal_logouts++;
2450                 spin_unlock(&tiqn->logout_stats.lock);
2451         }
2452
2453         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2454                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2455                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2456                 hdr->cid, conn->cid);
2457
2458         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2459                 pr_err("Received logout request on connection that"
2460                         " is not in logged in state, ignoring request.\n");
2461                 iscsit_free_cmd(cmd, false);
2462                 return 0;
2463         }
2464
2465         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2466         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2467         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2468         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2469         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2470         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2471         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2472         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2473         cmd->logout_reason      = reason_code;
2474         cmd->data_direction     = DMA_NONE;
2475
2476         /*
2477          * We need to sleep in these cases (by returning 1) until the Logout
2478          * Response gets sent in the tx thread.
2479          */
2480         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2481            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2482             be16_to_cpu(hdr->cid) == conn->cid))
2483                 logout_remove = 1;
2484
2485         spin_lock_bh(&conn->cmd_lock);
2486         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2487         spin_unlock_bh(&conn->cmd_lock);
2488
2489         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2490                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2491
2492         /*
2493          * Immediate commands are executed, well, immediately.
2494          * Non-Immediate Logout Commands are executed in CmdSN order.
2495          */
2496         if (cmd->immediate_cmd) {
2497                 int ret = iscsit_execute_cmd(cmd, 0);
2498
2499                 if (ret < 0)
2500                         return ret;
2501         } else {
2502                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2503                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2504                         logout_remove = 0;
2505                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2506                         return -1;
2507         }
2508
2509         return logout_remove;
2510 }
2511 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2512
2513 int iscsit_handle_snack(
2514         struct iscsi_conn *conn,
2515         unsigned char *buf)
2516 {
2517         struct iscsi_snack *hdr;
2518
2519         hdr                     = (struct iscsi_snack *) buf;
2520         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2521
2522         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2523                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2524                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2525                         hdr->begrun, hdr->runlength, conn->cid);
2526
2527         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2528                 pr_err("Initiator sent SNACK request while in"
2529                         " ErrorRecoveryLevel=0.\n");
2530                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2531                                          buf);
2532         }
2533         /*
2534          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2535          * call from inside iscsi_send_recovery_datain_or_r2t().
2536          */
2537         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2538         case 0:
2539                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2540                         hdr->itt,
2541                         be32_to_cpu(hdr->ttt),
2542                         be32_to_cpu(hdr->begrun),
2543                         be32_to_cpu(hdr->runlength));
2544         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2545                 return iscsit_handle_status_snack(conn, hdr->itt,
2546                         be32_to_cpu(hdr->ttt),
2547                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2548         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2549                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2550                         be32_to_cpu(hdr->begrun),
2551                         be32_to_cpu(hdr->runlength));
2552         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2553                 /* FIXME: Support R-Data SNACK */
2554                 pr_err("R-Data SNACK Not Supported.\n");
2555                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556                                          buf);
2557         default:
2558                 pr_err("Unknown SNACK type 0x%02x, protocol"
2559                         " error.\n", hdr->flags & 0x0f);
2560                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561                                          buf);
2562         }
2563
2564         return 0;
2565 }
2566 EXPORT_SYMBOL(iscsit_handle_snack);
2567
2568 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2569 {
2570         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2571             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2572                 wait_for_completion_interruptible_timeout(
2573                                         &conn->rx_half_close_comp,
2574                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2575         }
2576 }
2577
2578 static int iscsit_handle_immediate_data(
2579         struct iscsi_cmd *cmd,
2580         struct iscsi_scsi_req *hdr,
2581         u32 length)
2582 {
2583         int iov_ret, rx_got = 0, rx_size = 0;
2584         u32 checksum, iov_count = 0, padding = 0;
2585         struct iscsi_conn *conn = cmd->conn;
2586         struct kvec *iov;
2587
2588         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2589         if (iov_ret < 0)
2590                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2591
2592         rx_size = length;
2593         iov_count = iov_ret;
2594         iov = &cmd->iov_data[0];
2595
2596         padding = ((-length) & 3);
2597         if (padding != 0) {
2598                 iov[iov_count].iov_base = cmd->pad_bytes;
2599                 iov[iov_count++].iov_len = padding;
2600                 rx_size += padding;
2601         }
2602
2603         if (conn->conn_ops->DataDigest) {
2604                 iov[iov_count].iov_base         = &checksum;
2605                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2606                 rx_size += ISCSI_CRC_LEN;
2607         }
2608
2609         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2610
2611         iscsit_unmap_iovec(cmd);
2612
2613         if (rx_got != rx_size) {
2614                 iscsit_rx_thread_wait_for_tcp(conn);
2615                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2616         }
2617
2618         if (conn->conn_ops->DataDigest) {
2619                 u32 data_crc;
2620
2621                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2622                                                     cmd->write_data_done, length, padding,
2623                                                     cmd->pad_bytes);
2624
2625                 if (checksum != data_crc) {
2626                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2627                                 " does not match computed 0x%08x\n", checksum,
2628                                 data_crc);
2629
2630                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2631                                 pr_err("Unable to recover from"
2632                                         " Immediate Data digest failure while"
2633                                         " in ERL=0.\n");
2634                                 iscsit_reject_cmd(cmd,
2635                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2636                                                 (unsigned char *)hdr);
2637                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2638                         } else {
2639                                 iscsit_reject_cmd(cmd,
2640                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2641                                                 (unsigned char *)hdr);
2642                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2643                         }
2644                 } else {
2645                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2646                                 " %u bytes of Immediate Data\n", checksum,
2647                                 length);
2648                 }
2649         }
2650
2651         cmd->write_data_done += length;
2652
2653         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2654                 spin_lock_bh(&cmd->istate_lock);
2655                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2656                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2657                 spin_unlock_bh(&cmd->istate_lock);
2658         }
2659
2660         return IMMEDIATE_DATA_NORMAL_OPERATION;
2661 }
2662
2663 /*
2664  *      Called with sess->conn_lock held.
2665  */
2666 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2667         with active network interface */
2668 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2669 {
2670         struct iscsi_cmd *cmd;
2671         struct iscsi_conn *conn_p;
2672         bool found = false;
2673
2674         /*
2675          * Only send a Asynchronous Message on connections whos network
2676          * interface is still functional.
2677          */
2678         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2679                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2680                         iscsit_inc_conn_usage_count(conn_p);
2681                         found = true;
2682                         break;
2683                 }
2684         }
2685
2686         if (!found)
2687                 return;
2688
2689         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2690         if (!cmd) {
2691                 iscsit_dec_conn_usage_count(conn_p);
2692                 return;
2693         }
2694
2695         cmd->logout_cid = conn->cid;
2696         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2697         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2698
2699         spin_lock_bh(&conn_p->cmd_lock);
2700         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2701         spin_unlock_bh(&conn_p->cmd_lock);
2702
2703         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2704         iscsit_dec_conn_usage_count(conn_p);
2705 }
2706
2707 static int iscsit_send_conn_drop_async_message(
2708         struct iscsi_cmd *cmd,
2709         struct iscsi_conn *conn)
2710 {
2711         struct iscsi_async *hdr;
2712
2713         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2714
2715         hdr                     = (struct iscsi_async *) cmd->pdu;
2716         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2717         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2718         cmd->init_task_tag      = RESERVED_ITT;
2719         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2720         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2721         cmd->stat_sn            = conn->stat_sn++;
2722         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2723         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2724         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2725         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2726         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2727         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2728         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2729
2730         pr_debug("Sending Connection Dropped Async Message StatSN:"
2731                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2732                         cmd->logout_cid, conn->cid);
2733
2734         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2735 }
2736
2737 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2738 {
2739         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2740             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2741                 wait_for_completion_interruptible_timeout(
2742                                         &conn->tx_half_close_comp,
2743                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2744         }
2745 }
2746
2747 void
2748 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2749                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2750                         bool set_statsn)
2751 {
2752         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2753         hdr->flags              = datain->flags;
2754         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2755                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2756                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2757                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2758                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2759                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2760                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2761                 }
2762         }
2763         hton24(hdr->dlength, datain->length);
2764         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2765                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2766                                 (struct scsi_lun *)&hdr->lun);
2767         else
2768                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2769
2770         hdr->itt                = cmd->init_task_tag;
2771
2772         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2773                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2774         else
2775                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2776         if (set_statsn)
2777                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2778         else
2779                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2780
2781         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2782         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2783         hdr->datasn             = cpu_to_be32(datain->data_sn);
2784         hdr->offset             = cpu_to_be32(datain->offset);
2785
2786         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2787                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2788                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2789                 ntohl(hdr->offset), datain->length, conn->cid);
2790 }
2791 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2792
2793 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2794 {
2795         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2796         struct iscsi_datain datain;
2797         struct iscsi_datain_req *dr;
2798         int eodr = 0, ret;
2799         bool set_statsn = false;
2800
2801         memset(&datain, 0, sizeof(struct iscsi_datain));
2802         dr = iscsit_get_datain_values(cmd, &datain);
2803         if (!dr) {
2804                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2805                                 cmd->init_task_tag);
2806                 return -1;
2807         }
2808         /*
2809          * Be paranoid and double check the logic for now.
2810          */
2811         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2812                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2813                         " datain.length: %u exceeds cmd->data_length: %u\n",
2814                         cmd->init_task_tag, datain.offset, datain.length,
2815                         cmd->se_cmd.data_length);
2816                 return -1;
2817         }
2818
2819         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2820         /*
2821          * Special case for successfully execution w/ both DATAIN
2822          * and Sense Data.
2823          */
2824         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2825             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2826                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2827         else {
2828                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2829                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2830                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2831                         cmd->stat_sn = conn->stat_sn++;
2832                         set_statsn = true;
2833                 } else if (dr->dr_complete ==
2834                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2835                         set_statsn = true;
2836         }
2837
2838         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2839
2840         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2841         if (ret < 0)
2842                 return ret;
2843
2844         if (dr->dr_complete) {
2845                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2846                                 2 : 1;
2847                 iscsit_free_datain_req(cmd, dr);
2848         }
2849
2850         return eodr;
2851 }
2852
2853 int
2854 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2855                         struct iscsi_logout_rsp *hdr)
2856 {
2857         struct iscsi_conn *logout_conn = NULL;
2858         struct iscsi_conn_recovery *cr = NULL;
2859         struct iscsi_session *sess = conn->sess;
2860         /*
2861          * The actual shutting down of Sessions and/or Connections
2862          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2863          * is done in scsi_logout_post_handler().
2864          */
2865         switch (cmd->logout_reason) {
2866         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2867                 pr_debug("iSCSI session logout successful, setting"
2868                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2869                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2870                 break;
2871         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2872                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2873                         break;
2874                 /*
2875                  * For CLOSECONNECTION logout requests carrying
2876                  * a matching logout CID -> local CID, the reference
2877                  * for the local CID will have been incremented in
2878                  * iscsi_logout_closeconnection().
2879                  *
2880                  * For CLOSECONNECTION logout requests carrying
2881                  * a different CID than the connection it arrived
2882                  * on, the connection responding to cmd->logout_cid
2883                  * is stopped in iscsit_logout_post_handler_diffcid().
2884                  */
2885
2886                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2887                         " successful.\n", cmd->logout_cid, conn->cid);
2888                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889                 break;
2890         case ISCSI_LOGOUT_REASON_RECOVERY:
2891                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2892                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2893                         break;
2894                 /*
2895                  * If the connection is still active from our point of view
2896                  * force connection recovery to occur.
2897                  */
2898                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2899                                 cmd->logout_cid);
2900                 if (logout_conn) {
2901                         iscsit_connection_reinstatement_rcfr(logout_conn);
2902                         iscsit_dec_conn_usage_count(logout_conn);
2903                 }
2904
2905                 cr = iscsit_get_inactive_connection_recovery_entry(
2906                                 conn->sess, cmd->logout_cid);
2907                 if (!cr) {
2908                         pr_err("Unable to locate CID: %hu for"
2909                         " REMOVECONNFORRECOVERY Logout Request.\n",
2910                                 cmd->logout_cid);
2911                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2912                         break;
2913                 }
2914
2915                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2916
2917                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2918                         " for recovery for CID: %hu on CID: %hu successful.\n",
2919                                 cmd->logout_cid, conn->cid);
2920                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2921                 break;
2922         default:
2923                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2924                                 cmd->logout_reason);
2925                 return -1;
2926         }
2927
2928         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2929         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2930         hdr->response           = cmd->logout_response;
2931         hdr->itt                = cmd->init_task_tag;
2932         cmd->stat_sn            = conn->stat_sn++;
2933         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2934
2935         iscsit_increment_maxcmdsn(cmd, conn->sess);
2936         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2937         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2938
2939         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2940                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2941                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2942                 cmd->logout_cid, conn->cid);
2943
2944         return 0;
2945 }
2946 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2947
2948 static int
2949 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2950 {
2951         int rc;
2952
2953         rc = iscsit_build_logout_rsp(cmd, conn,
2954                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2955         if (rc < 0)
2956                 return rc;
2957
2958         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2959 }
2960
2961 void
2962 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2963                        struct iscsi_nopin *hdr, bool nopout_response)
2964 {
2965         hdr->opcode             = ISCSI_OP_NOOP_IN;
2966         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2967         hton24(hdr->dlength, cmd->buf_ptr_size);
2968         if (nopout_response)
2969                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2970         hdr->itt                = cmd->init_task_tag;
2971         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2972         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2973                                   conn->stat_sn;
2974         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2975
2976         if (nopout_response)
2977                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2978
2979         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2980         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2981
2982         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2983                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2984                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2985                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2986 }
2987 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2988
2989 /*
2990  *      Unsolicited NOPIN, either requesting a response or not.
2991  */
2992 static int iscsit_send_unsolicited_nopin(
2993         struct iscsi_cmd *cmd,
2994         struct iscsi_conn *conn,
2995         int want_response)
2996 {
2997         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2998         int ret;
2999
3000         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3001
3002         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3003                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3004
3005         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3006         if (ret < 0)
3007                 return ret;
3008
3009         spin_lock_bh(&cmd->istate_lock);
3010         cmd->i_state = want_response ?
3011                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3012         spin_unlock_bh(&cmd->istate_lock);
3013
3014         return 0;
3015 }
3016
3017 static int
3018 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3019 {
3020         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3021
3022         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3023
3024         /*
3025          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3026          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3027          */
3028         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3029
3030         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3031                                                      cmd->buf_ptr,
3032                                                      cmd->buf_ptr_size);
3033 }
3034
3035 static int iscsit_send_r2t(
3036         struct iscsi_cmd *cmd,
3037         struct iscsi_conn *conn)
3038 {
3039         struct iscsi_r2t *r2t;
3040         struct iscsi_r2t_rsp *hdr;
3041         int ret;
3042
3043         r2t = iscsit_get_r2t_from_list(cmd);
3044         if (!r2t)
3045                 return -1;
3046
3047         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3048         memset(hdr, 0, ISCSI_HDR_LEN);
3049         hdr->opcode             = ISCSI_OP_R2T;
3050         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3051         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3052                         (struct scsi_lun *)&hdr->lun);
3053         hdr->itt                = cmd->init_task_tag;
3054         if (conn->conn_transport->iscsit_get_r2t_ttt)
3055                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3056         else
3057                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3058         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3059         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3060         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3061         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3062         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3063         hdr->data_offset        = cpu_to_be32(r2t->offset);
3064         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3065
3066         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3067                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3068                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3069                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3070                         r2t->offset, r2t->xfer_len, conn->cid);
3071
3072         spin_lock_bh(&cmd->r2t_lock);
3073         r2t->sent_r2t = 1;
3074         spin_unlock_bh(&cmd->r2t_lock);
3075
3076         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3077         if (ret < 0) {
3078                 return ret;
3079         }
3080
3081         spin_lock_bh(&cmd->dataout_timeout_lock);
3082         iscsit_start_dataout_timer(cmd, conn);
3083         spin_unlock_bh(&cmd->dataout_timeout_lock);
3084
3085         return 0;
3086 }
3087
3088 /*
3089  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3090  *              connection recovery.
3091  */
3092 int iscsit_build_r2ts_for_cmd(
3093         struct iscsi_conn *conn,
3094         struct iscsi_cmd *cmd,
3095         bool recovery)
3096 {
3097         int first_r2t = 1;
3098         u32 offset = 0, xfer_len = 0;
3099
3100         spin_lock_bh(&cmd->r2t_lock);
3101         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3102                 spin_unlock_bh(&cmd->r2t_lock);
3103                 return 0;
3104         }
3105
3106         if (conn->sess->sess_ops->DataSequenceInOrder &&
3107             !recovery)
3108                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3109
3110         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3111                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3112                         offset = cmd->r2t_offset;
3113
3114                         if (first_r2t && recovery) {
3115                                 int new_data_end = offset +
3116                                         conn->sess->sess_ops->MaxBurstLength -
3117                                         cmd->next_burst_len;
3118
3119                                 if (new_data_end > cmd->se_cmd.data_length)
3120                                         xfer_len = cmd->se_cmd.data_length - offset;
3121                                 else
3122                                         xfer_len =
3123                                                 conn->sess->sess_ops->MaxBurstLength -
3124                                                 cmd->next_burst_len;
3125                         } else {
3126                                 int new_data_end = offset +
3127                                         conn->sess->sess_ops->MaxBurstLength;
3128
3129                                 if (new_data_end > cmd->se_cmd.data_length)
3130                                         xfer_len = cmd->se_cmd.data_length - offset;
3131                                 else
3132                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3133                         }
3134                         cmd->r2t_offset += xfer_len;
3135
3136                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3137                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3138                 } else {
3139                         struct iscsi_seq *seq;
3140
3141                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3142                         if (!seq) {
3143                                 spin_unlock_bh(&cmd->r2t_lock);
3144                                 return -1;
3145                         }
3146
3147                         offset = seq->offset;
3148                         xfer_len = seq->xfer_len;
3149
3150                         if (cmd->seq_send_order == cmd->seq_count)
3151                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152                 }
3153                 cmd->outstanding_r2ts++;
3154                 first_r2t = 0;
3155
3156                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3157                         spin_unlock_bh(&cmd->r2t_lock);
3158                         return -1;
3159                 }
3160
3161                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3162                         break;
3163         }
3164         spin_unlock_bh(&cmd->r2t_lock);
3165
3166         return 0;
3167 }
3168 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3169
3170 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3171                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3172 {
3173         if (inc_stat_sn)
3174                 cmd->stat_sn = conn->stat_sn++;
3175
3176         atomic_long_inc(&conn->sess->rsp_pdus);
3177
3178         memset(hdr, 0, ISCSI_HDR_LEN);
3179         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3180         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3181         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3182                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3183                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3184         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3185                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3186                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187         }
3188         hdr->response           = cmd->iscsi_response;
3189         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3190         hdr->itt                = cmd->init_task_tag;
3191         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3192
3193         iscsit_increment_maxcmdsn(cmd, conn->sess);
3194         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3195         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3196
3197         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3198                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3199                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3200                 cmd->se_cmd.scsi_status, conn->cid);
3201 }
3202 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3203
3204 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3205 {
3206         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3207         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3208         void *data_buf = NULL;
3209         u32 padding = 0, data_buf_len = 0;
3210
3211         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3212
3213         /*
3214          * Attach SENSE DATA payload to iSCSI Response PDU
3215          */
3216         if (cmd->se_cmd.sense_buffer &&
3217            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3218             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3219                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3220                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3221
3222                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3223                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3224                 data_buf = cmd->sense_buffer;
3225                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3226
3227                 if (padding) {
3228                         memset(cmd->sense_buffer +
3229                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3230                         pr_debug("Adding %u bytes of padding to"
3231                                 " SENSE.\n", padding);
3232                 }
3233
3234                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3235                                 " Response PDU\n",
3236                                 cmd->se_cmd.scsi_sense_length);
3237         }
3238
3239         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3240                                                      data_buf_len);
3241 }
3242
3243 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3244 {
3245         switch (se_tmr->response) {
3246         case TMR_FUNCTION_COMPLETE:
3247                 return ISCSI_TMF_RSP_COMPLETE;
3248         case TMR_TASK_DOES_NOT_EXIST:
3249                 return ISCSI_TMF_RSP_NO_TASK;
3250         case TMR_LUN_DOES_NOT_EXIST:
3251                 return ISCSI_TMF_RSP_NO_LUN;
3252         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3253                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3254         case TMR_FUNCTION_REJECTED:
3255         default:
3256                 return ISCSI_TMF_RSP_REJECTED;
3257         }
3258 }
3259
3260 void
3261 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3262                           struct iscsi_tm_rsp *hdr)
3263 {
3264         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3265
3266         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3267         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3268         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3269         hdr->itt                = cmd->init_task_tag;
3270         cmd->stat_sn            = conn->stat_sn++;
3271         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3272
3273         iscsit_increment_maxcmdsn(cmd, conn->sess);
3274         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3275         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276
3277         pr_debug("Built Task Management Response ITT: 0x%08x,"
3278                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3279                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3280 }
3281 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3282
3283 static int
3284 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3285 {
3286         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3287
3288         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3289
3290         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3291 }
3292
3293 #define SENDTARGETS_BUF_LIMIT 32768U
3294
3295 static int
3296 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3297                                   enum iscsit_transport_type network_transport,
3298                                   int skip_bytes, bool *completed)
3299 {
3300         char *payload = NULL;
3301         struct iscsi_conn *conn = cmd->conn;
3302         struct iscsi_portal_group *tpg;
3303         struct iscsi_tiqn *tiqn;
3304         struct iscsi_tpg_np *tpg_np;
3305         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3306         int target_name_printed;
3307         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3308         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3309         bool active;
3310
3311         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3312                          SENDTARGETS_BUF_LIMIT);
3313
3314         payload = kzalloc(buffer_len, GFP_KERNEL);
3315         if (!payload)
3316                 return -ENOMEM;
3317
3318         /*
3319          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3320          * explicit case..
3321          */
3322         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3323                 text_ptr = strchr(text_in, '=');
3324                 if (!text_ptr) {
3325                         pr_err("Unable to locate '=' string in text_in:"
3326                                " %s\n", text_in);
3327                         kfree(payload);
3328                         return -EINVAL;
3329                 }
3330                 /*
3331                  * Skip over '=' character..
3332                  */
3333                 text_ptr += 1;
3334         }
3335
3336         spin_lock(&tiqn_lock);
3337         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3338                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3339                      strcmp(tiqn->tiqn, text_ptr)) {
3340                         continue;
3341                 }
3342
3343                 target_name_printed = 0;
3344
3345                 spin_lock(&tiqn->tiqn_tpg_lock);
3346                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3347
3348                         /* If demo_mode_discovery=0 and generate_node_acls=0
3349                          * (demo mode dislabed) do not return
3350                          * TargetName+TargetAddress unless a NodeACL exists.
3351                          */
3352
3353                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3354                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3355                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3356                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3357                                 continue;
3358                         }
3359
3360                         spin_lock(&tpg->tpg_state_lock);
3361                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3362                         spin_unlock(&tpg->tpg_state_lock);
3363
3364                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3365                                 continue;
3366
3367                         spin_lock(&tpg->tpg_np_lock);
3368                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3369                                                 tpg_np_list) {
3370                                 struct iscsi_np *np = tpg_np->tpg_np;
3371                                 struct sockaddr_storage *sockaddr;
3372
3373                                 if (np->np_network_transport != network_transport)
3374                                         continue;
3375
3376                                 if (!target_name_printed) {
3377                                         len = sprintf(buf, "TargetName=%s",
3378                                                       tiqn->tiqn);
3379                                         len += 1;
3380
3381                                         if ((len + payload_len) > buffer_len) {
3382                                                 spin_unlock(&tpg->tpg_np_lock);
3383                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3384                                                 end_of_buf = 1;
3385                                                 goto eob;
3386                                         }
3387
3388                                         if (skip_bytes && len <= skip_bytes) {
3389                                                 skip_bytes -= len;
3390                                         } else {
3391                                                 memcpy(payload + payload_len, buf, len);
3392                                                 payload_len += len;
3393                                                 target_name_printed = 1;
3394                                                 if (len > skip_bytes)
3395                                                         skip_bytes = 0;
3396                                         }
3397                                 }
3398
3399                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3400                                         sockaddr = &conn->local_sockaddr;
3401                                 else
3402                                         sockaddr = &np->np_sockaddr;
3403
3404                                 len = sprintf(buf, "TargetAddress="
3405                                               "%pISpc,%hu",
3406                                               sockaddr,
3407                                               tpg->tpgt);
3408                                 len += 1;
3409
3410                                 if ((len + payload_len) > buffer_len) {
3411                                         spin_unlock(&tpg->tpg_np_lock);
3412                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3413                                         end_of_buf = 1;
3414                                         goto eob;
3415                                 }
3416
3417                                 if (skip_bytes && len <= skip_bytes) {
3418                                         skip_bytes -= len;
3419                                 } else {
3420                                         memcpy(payload + payload_len, buf, len);
3421                                         payload_len += len;
3422                                         if (len > skip_bytes)
3423                                                 skip_bytes = 0;
3424                                 }
3425                         }
3426                         spin_unlock(&tpg->tpg_np_lock);
3427                 }
3428                 spin_unlock(&tiqn->tiqn_tpg_lock);
3429 eob:
3430                 if (end_of_buf) {
3431                         *completed = false;
3432                         break;
3433                 }
3434
3435                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3436                         break;
3437         }
3438         spin_unlock(&tiqn_lock);
3439
3440         cmd->buf_ptr = payload;
3441
3442         return payload_len;
3443 }
3444
3445 int
3446 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3447                       struct iscsi_text_rsp *hdr,
3448                       enum iscsit_transport_type network_transport)
3449 {
3450         int text_length, padding;
3451         bool completed = true;
3452
3453         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3454                                                         cmd->read_data_done,
3455                                                         &completed);
3456         if (text_length < 0)
3457                 return text_length;
3458
3459         if (completed) {
3460                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3461         } else {
3462                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3463                 cmd->read_data_done += text_length;
3464                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3465                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3466         }
3467         hdr->opcode = ISCSI_OP_TEXT_RSP;
3468         padding = ((-text_length) & 3);
3469         hton24(hdr->dlength, text_length);
3470         hdr->itt = cmd->init_task_tag;
3471         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3472         cmd->stat_sn = conn->stat_sn++;
3473         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3474
3475         iscsit_increment_maxcmdsn(cmd, conn->sess);
3476         /*
3477          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3478          * correctly increment MaxCmdSN for each response answering a
3479          * non immediate text request with a valid CmdSN.
3480          */
3481         cmd->maxcmdsn_inc = 0;
3482         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3483         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3484
3485         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3486                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3487                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3488                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3489                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3490
3491         return text_length + padding;
3492 }
3493 EXPORT_SYMBOL(iscsit_build_text_rsp);
3494
3495 static int iscsit_send_text_rsp(
3496         struct iscsi_cmd *cmd,
3497         struct iscsi_conn *conn)
3498 {
3499         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3500         int text_length;
3501
3502         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3503                                 conn->conn_transport->transport_type);
3504         if (text_length < 0)
3505                 return text_length;
3506
3507         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3508                                                      cmd->buf_ptr,
3509                                                      text_length);
3510 }
3511
3512 void
3513 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3514                     struct iscsi_reject *hdr)
3515 {
3516         hdr->opcode             = ISCSI_OP_REJECT;
3517         hdr->reason             = cmd->reject_reason;
3518         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3519         hton24(hdr->dlength, ISCSI_HDR_LEN);
3520         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3521         cmd->stat_sn            = conn->stat_sn++;
3522         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3523         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3524         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3525
3526 }
3527 EXPORT_SYMBOL(iscsit_build_reject);
3528
3529 static int iscsit_send_reject(
3530         struct iscsi_cmd *cmd,
3531         struct iscsi_conn *conn)
3532 {
3533         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3534
3535         iscsit_build_reject(cmd, conn, hdr);
3536
3537         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3538                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3539
3540         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3541                                                      cmd->buf_ptr,
3542                                                      ISCSI_HDR_LEN);
3543 }
3544
3545 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3546 {
3547         int ord, cpu;
3548         /*
3549          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3550          * within iscsit_start_kthreads()
3551          *
3552          * Here we use bitmap_id to determine which CPU that this
3553          * iSCSI connection's RX/TX threads will be scheduled to
3554          * execute upon.
3555          */
3556         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3557         for_each_online_cpu(cpu) {
3558                 if (ord-- == 0) {
3559                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3560                         return;
3561                 }
3562         }
3563         /*
3564          * This should never be reached..
3565          */
3566         dump_stack();
3567         cpumask_setall(conn->conn_cpumask);
3568 }
3569
3570 int
3571 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3572 {
3573         int ret;
3574
3575         switch (state) {
3576         case ISTATE_SEND_R2T:
3577                 ret = iscsit_send_r2t(cmd, conn);
3578                 if (ret < 0)
3579                         goto err;
3580                 break;
3581         case ISTATE_REMOVE:
3582                 spin_lock_bh(&conn->cmd_lock);
3583                 list_del_init(&cmd->i_conn_node);
3584                 spin_unlock_bh(&conn->cmd_lock);
3585
3586                 iscsit_free_cmd(cmd, false);
3587                 break;
3588         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3589                 iscsit_mod_nopin_response_timer(conn);
3590                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3591                 if (ret < 0)
3592                         goto err;
3593                 break;
3594         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3595                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3596                 if (ret < 0)
3597                         goto err;
3598                 break;
3599         default:
3600                 pr_err("Unknown Opcode: 0x%02x ITT:"
3601                        " 0x%08x, i_state: %d on CID: %hu\n",
3602                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3603                        conn->cid);
3604                 goto err;
3605         }
3606
3607         return 0;
3608
3609 err:
3610         return -1;
3611 }
3612 EXPORT_SYMBOL(iscsit_immediate_queue);
3613
3614 static int
3615 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3616 {
3617         struct iscsit_transport *t = conn->conn_transport;
3618         struct iscsi_queue_req *qr;
3619         struct iscsi_cmd *cmd;
3620         u8 state;
3621         int ret;
3622
3623         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3624                 atomic_set(&conn->check_immediate_queue, 0);
3625                 cmd = qr->cmd;
3626                 state = qr->state;
3627                 kmem_cache_free(lio_qr_cache, qr);
3628
3629                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3630                 if (ret < 0)
3631                         return ret;
3632         }
3633
3634         return 0;
3635 }
3636
3637 int
3638 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3639 {
3640         int ret;
3641
3642 check_rsp_state:
3643         switch (state) {
3644         case ISTATE_SEND_DATAIN:
3645                 ret = iscsit_send_datain(cmd, conn);
3646                 if (ret < 0)
3647                         goto err;
3648                 else if (!ret)
3649                         /* more drs */
3650                         goto check_rsp_state;
3651                 else if (ret == 1) {
3652                         /* all done */
3653                         spin_lock_bh(&cmd->istate_lock);
3654                         cmd->i_state = ISTATE_SENT_STATUS;
3655                         spin_unlock_bh(&cmd->istate_lock);
3656
3657                         if (atomic_read(&conn->check_immediate_queue))
3658                                 return 1;
3659
3660                         return 0;
3661                 } else if (ret == 2) {
3662                         /* Still must send status,
3663                            SCF_TRANSPORT_TASK_SENSE was set */
3664                         spin_lock_bh(&cmd->istate_lock);
3665                         cmd->i_state = ISTATE_SEND_STATUS;
3666                         spin_unlock_bh(&cmd->istate_lock);
3667                         state = ISTATE_SEND_STATUS;
3668                         goto check_rsp_state;
3669                 }
3670
3671                 break;
3672         case ISTATE_SEND_STATUS:
3673         case ISTATE_SEND_STATUS_RECOVERY:
3674                 ret = iscsit_send_response(cmd, conn);
3675                 break;
3676         case ISTATE_SEND_LOGOUTRSP:
3677                 ret = iscsit_send_logout(cmd, conn);
3678                 break;
3679         case ISTATE_SEND_ASYNCMSG:
3680                 ret = iscsit_send_conn_drop_async_message(
3681                         cmd, conn);
3682                 break;
3683         case ISTATE_SEND_NOPIN:
3684                 ret = iscsit_send_nopin(cmd, conn);
3685                 break;
3686         case ISTATE_SEND_REJECT:
3687                 ret = iscsit_send_reject(cmd, conn);
3688                 break;
3689         case ISTATE_SEND_TASKMGTRSP:
3690                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3691                 if (ret != 0)
3692                         break;
3693                 ret = iscsit_tmr_post_handler(cmd, conn);
3694                 if (ret != 0)
3695                         iscsit_fall_back_to_erl0(conn->sess);
3696                 break;
3697         case ISTATE_SEND_TEXTRSP:
3698                 ret = iscsit_send_text_rsp(cmd, conn);
3699                 break;
3700         default:
3701                 pr_err("Unknown Opcode: 0x%02x ITT:"
3702                        " 0x%08x, i_state: %d on CID: %hu\n",
3703                        cmd->iscsi_opcode, cmd->init_task_tag,
3704                        state, conn->cid);
3705                 goto err;
3706         }
3707         if (ret < 0)
3708                 goto err;
3709
3710         switch (state) {
3711         case ISTATE_SEND_LOGOUTRSP:
3712                 if (!iscsit_logout_post_handler(cmd, conn))
3713                         return -ECONNRESET;
3714                 /* fall through */
3715         case ISTATE_SEND_STATUS:
3716         case ISTATE_SEND_ASYNCMSG:
3717         case ISTATE_SEND_NOPIN:
3718         case ISTATE_SEND_STATUS_RECOVERY:
3719         case ISTATE_SEND_TEXTRSP:
3720         case ISTATE_SEND_TASKMGTRSP:
3721         case ISTATE_SEND_REJECT:
3722                 spin_lock_bh(&cmd->istate_lock);
3723                 cmd->i_state = ISTATE_SENT_STATUS;
3724                 spin_unlock_bh(&cmd->istate_lock);
3725                 break;
3726         default:
3727                 pr_err("Unknown Opcode: 0x%02x ITT:"
3728                        " 0x%08x, i_state: %d on CID: %hu\n",
3729                        cmd->iscsi_opcode, cmd->init_task_tag,
3730                        cmd->i_state, conn->cid);
3731                 goto err;
3732         }
3733
3734         if (atomic_read(&conn->check_immediate_queue))
3735                 return 1;
3736
3737         return 0;
3738
3739 err:
3740         return -1;
3741 }
3742 EXPORT_SYMBOL(iscsit_response_queue);
3743
3744 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3745 {
3746         struct iscsit_transport *t = conn->conn_transport;
3747         struct iscsi_queue_req *qr;
3748         struct iscsi_cmd *cmd;
3749         u8 state;
3750         int ret;
3751
3752         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3753                 cmd = qr->cmd;
3754                 state = qr->state;
3755                 kmem_cache_free(lio_qr_cache, qr);
3756
3757                 ret = t->iscsit_response_queue(conn, cmd, state);
3758                 if (ret == 1 || ret < 0)
3759                         return ret;
3760         }
3761
3762         return 0;
3763 }
3764
3765 int iscsi_target_tx_thread(void *arg)
3766 {
3767         int ret = 0;
3768         struct iscsi_conn *conn = arg;
3769         bool conn_freed = false;
3770
3771         /*
3772          * Allow ourselves to be interrupted by SIGINT so that a
3773          * connection recovery / failure event can be triggered externally.
3774          */
3775         allow_signal(SIGINT);
3776
3777         while (!kthread_should_stop()) {
3778                 /*
3779                  * Ensure that both TX and RX per connection kthreads
3780                  * are scheduled to run on the same CPU.
3781                  */
3782                 iscsit_thread_check_cpumask(conn, current, 1);
3783
3784                 wait_event_interruptible(conn->queues_wq,
3785                                          !iscsit_conn_all_queues_empty(conn));
3786
3787                 if (signal_pending(current))
3788                         goto transport_err;
3789
3790 get_immediate:
3791                 ret = iscsit_handle_immediate_queue(conn);
3792                 if (ret < 0)
3793                         goto transport_err;
3794
3795                 ret = iscsit_handle_response_queue(conn);
3796                 if (ret == 1) {
3797                         goto get_immediate;
3798                 } else if (ret == -ECONNRESET) {
3799                         conn_freed = true;
3800                         goto out;
3801                 } else if (ret < 0) {
3802                         goto transport_err;
3803                 }
3804         }
3805
3806 transport_err:
3807         /*
3808          * Avoid the normal connection failure code-path if this connection
3809          * is still within LOGIN mode, and iscsi_np process context is
3810          * responsible for cleaning up the early connection failure.
3811          */
3812         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3813                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3814 out:
3815         if (!conn_freed) {
3816                 while (!kthread_should_stop()) {
3817                         msleep(100);
3818                 }
3819         }
3820         return 0;
3821 }
3822
3823 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3824 {
3825         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3826         struct iscsi_cmd *cmd;
3827         int ret = 0;
3828
3829         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3830         case ISCSI_OP_SCSI_CMD:
3831                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3832                 if (!cmd)
3833                         goto reject;
3834
3835                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3836                 break;
3837         case ISCSI_OP_SCSI_DATA_OUT:
3838                 ret = iscsit_handle_data_out(conn, buf);
3839                 break;
3840         case ISCSI_OP_NOOP_OUT:
3841                 cmd = NULL;
3842                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3843                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3844                         if (!cmd)
3845                                 goto reject;
3846                 }
3847                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3848                 break;
3849         case ISCSI_OP_SCSI_TMFUNC:
3850                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3851                 if (!cmd)
3852                         goto reject;
3853
3854                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3855                 break;
3856         case ISCSI_OP_TEXT:
3857                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3858                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3859                         if (!cmd)
3860                                 goto reject;
3861                 } else {
3862                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3863                         if (!cmd)
3864                                 goto reject;
3865                 }
3866
3867                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3868                 break;
3869         case ISCSI_OP_LOGOUT:
3870                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3871                 if (!cmd)
3872                         goto reject;
3873
3874                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3875                 if (ret > 0)
3876                         wait_for_completion_timeout(&conn->conn_logout_comp,
3877                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3878                 break;
3879         case ISCSI_OP_SNACK:
3880                 ret = iscsit_handle_snack(conn, buf);
3881                 break;
3882         default:
3883                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3884                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3885                         pr_err("Cannot recover from unknown"
3886                         " opcode while ERL=0, closing iSCSI connection.\n");
3887                         return -1;
3888                 }
3889                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3890                        " closing iSCSI connection.\n");
3891                 ret = -1;
3892                 break;
3893         }
3894
3895         return ret;
3896 reject:
3897         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3898 }
3899
3900 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3901 {
3902         bool ret;
3903
3904         spin_lock_bh(&conn->state_lock);
3905         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3906         spin_unlock_bh(&conn->state_lock);
3907
3908         return ret;
3909 }
3910
3911 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3912 {
3913         int ret;
3914         u8 *buffer, opcode;
3915         u32 checksum = 0, digest = 0;
3916         struct kvec iov;
3917
3918         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3919         if (!buffer)
3920                 return;
3921
3922         while (!kthread_should_stop()) {
3923                 /*
3924                  * Ensure that both TX and RX per connection kthreads
3925                  * are scheduled to run on the same CPU.
3926                  */
3927                 iscsit_thread_check_cpumask(conn, current, 0);
3928
3929                 memset(&iov, 0, sizeof(struct kvec));
3930
3931                 iov.iov_base    = buffer;
3932                 iov.iov_len     = ISCSI_HDR_LEN;
3933
3934                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3935                 if (ret != ISCSI_HDR_LEN) {
3936                         iscsit_rx_thread_wait_for_tcp(conn);
3937                         break;
3938                 }
3939
3940                 if (conn->conn_ops->HeaderDigest) {
3941                         iov.iov_base    = &digest;
3942                         iov.iov_len     = ISCSI_CRC_LEN;
3943
3944                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3945                         if (ret != ISCSI_CRC_LEN) {
3946                                 iscsit_rx_thread_wait_for_tcp(conn);
3947                                 break;
3948                         }
3949
3950                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3951                                                   ISCSI_HDR_LEN, 0, NULL,
3952                                                   &checksum);
3953
3954                         if (digest != checksum) {
3955                                 pr_err("HeaderDigest CRC32C failed,"
3956                                         " received 0x%08x, computed 0x%08x\n",
3957                                         digest, checksum);
3958                                 /*
3959                                  * Set the PDU to 0xff so it will intentionally
3960                                  * hit default in the switch below.
3961                                  */
3962                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3963                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3964                         } else {
3965                                 pr_debug("Got HeaderDigest CRC32C"
3966                                                 " 0x%08x\n", checksum);
3967                         }
3968                 }
3969
3970                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3971                         break;
3972
3973                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3974
3975                 if (conn->sess->sess_ops->SessionType &&
3976                    ((!(opcode & ISCSI_OP_TEXT)) ||
3977                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3978                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3979                         " while in Discovery Session, rejecting.\n", opcode);
3980                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3981                                           buffer);
3982                         break;
3983                 }
3984
3985                 ret = iscsi_target_rx_opcode(conn, buffer);
3986                 if (ret < 0)
3987                         break;
3988         }
3989
3990         kfree(buffer);
3991 }
3992
3993 int iscsi_target_rx_thread(void *arg)
3994 {
3995         int rc;
3996         struct iscsi_conn *conn = arg;
3997         bool conn_freed = false;
3998
3999         /*
4000          * Allow ourselves to be interrupted by SIGINT so that a
4001          * connection recovery / failure event can be triggered externally.
4002          */
4003         allow_signal(SIGINT);
4004         /*
4005          * Wait for iscsi_post_login_handler() to complete before allowing
4006          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4007          */
4008         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4009         if (rc < 0 || iscsi_target_check_conn_state(conn))
4010                 goto out;
4011
4012         if (!conn->conn_transport->iscsit_get_rx_pdu)
4013                 return 0;
4014
4015         conn->conn_transport->iscsit_get_rx_pdu(conn);
4016
4017         if (!signal_pending(current))
4018                 atomic_set(&conn->transport_failed, 1);
4019         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4020
4021 out:
4022         if (!conn_freed) {
4023                 while (!kthread_should_stop()) {
4024                         msleep(100);
4025                 }
4026         }
4027
4028         return 0;
4029 }
4030
4031 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4032 {
4033         LIST_HEAD(tmp_list);
4034         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4035         struct iscsi_session *sess = conn->sess;
4036         /*
4037          * We expect this function to only ever be called from either RX or TX
4038          * thread context via iscsit_close_connection() once the other context
4039          * has been reset -> returned sleeping pre-handler state.
4040          */
4041         spin_lock_bh(&conn->cmd_lock);
4042         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4043
4044         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4045                 struct se_cmd *se_cmd = &cmd->se_cmd;
4046
4047                 if (se_cmd->se_tfo != NULL) {
4048                         spin_lock(&se_cmd->t_state_lock);
4049                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4050                         spin_unlock(&se_cmd->t_state_lock);
4051                 }
4052         }
4053         spin_unlock_bh(&conn->cmd_lock);
4054
4055         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4056                 list_del_init(&cmd->i_conn_node);
4057
4058                 iscsit_increment_maxcmdsn(cmd, sess);
4059                 iscsit_free_cmd(cmd, true);
4060
4061         }
4062 }
4063
4064 static void iscsit_stop_timers_for_cmds(
4065         struct iscsi_conn *conn)
4066 {
4067         struct iscsi_cmd *cmd;
4068
4069         spin_lock_bh(&conn->cmd_lock);
4070         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4071                 if (cmd->data_direction == DMA_TO_DEVICE)
4072                         iscsit_stop_dataout_timer(cmd);
4073         }
4074         spin_unlock_bh(&conn->cmd_lock);
4075 }
4076
4077 int iscsit_close_connection(
4078         struct iscsi_conn *conn)
4079 {
4080         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4081         struct iscsi_session    *sess = conn->sess;
4082
4083         pr_debug("Closing iSCSI connection CID %hu on SID:"
4084                 " %u\n", conn->cid, sess->sid);
4085         /*
4086          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4087          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4088          * sleeping and the logout response never got sent because the
4089          * connection failed.
4090          *
4091          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4092          * to signal logout response TX interrupt completion.  Go ahead and skip
4093          * this for iser since isert_rx_opcode() does not wait on logout failure,
4094          * and to avoid iscsi_conn pointer dereference in iser-target code.
4095          */
4096         if (!conn->conn_transport->rdma_shutdown)
4097                 complete(&conn->conn_logout_comp);
4098
4099         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4100                 if (conn->tx_thread &&
4101                     cmpxchg(&conn->tx_thread_active, true, false)) {
4102                         send_sig(SIGINT, conn->tx_thread, 1);
4103                         kthread_stop(conn->tx_thread);
4104                 }
4105         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4106                 if (conn->rx_thread &&
4107                     cmpxchg(&conn->rx_thread_active, true, false)) {
4108                         send_sig(SIGINT, conn->rx_thread, 1);
4109                         kthread_stop(conn->rx_thread);
4110                 }
4111         }
4112
4113         spin_lock(&iscsit_global->ts_bitmap_lock);
4114         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4115                               get_order(1));
4116         spin_unlock(&iscsit_global->ts_bitmap_lock);
4117
4118         iscsit_stop_timers_for_cmds(conn);
4119         iscsit_stop_nopin_response_timer(conn);
4120         iscsit_stop_nopin_timer(conn);
4121
4122         if (conn->conn_transport->iscsit_wait_conn)
4123                 conn->conn_transport->iscsit_wait_conn(conn);
4124
4125         /*
4126          * During Connection recovery drop unacknowledged out of order
4127          * commands for this connection, and prepare the other commands
4128          * for reallegiance.
4129          *
4130          * During normal operation clear the out of order commands (but
4131          * do not free the struct iscsi_ooo_cmdsn's) and release all
4132          * struct iscsi_cmds.
4133          */
4134         if (atomic_read(&conn->connection_recovery)) {
4135                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4136                 iscsit_prepare_cmds_for_reallegiance(conn);
4137         } else {
4138                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4139                 iscsit_release_commands_from_conn(conn);
4140         }
4141         iscsit_free_queue_reqs_for_conn(conn);
4142
4143         /*
4144          * Handle decrementing session or connection usage count if
4145          * a logout response was not able to be sent because the
4146          * connection failed.  Fall back to Session Recovery here.
4147          */
4148         if (atomic_read(&conn->conn_logout_remove)) {
4149                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4150                         iscsit_dec_conn_usage_count(conn);
4151                         iscsit_dec_session_usage_count(sess);
4152                 }
4153                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4154                         iscsit_dec_conn_usage_count(conn);
4155
4156                 atomic_set(&conn->conn_logout_remove, 0);
4157                 atomic_set(&sess->session_reinstatement, 0);
4158                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4159         }
4160
4161         spin_lock_bh(&sess->conn_lock);
4162         list_del(&conn->conn_list);
4163
4164         /*
4165          * Attempt to let the Initiator know this connection failed by
4166          * sending an Connection Dropped Async Message on another
4167          * active connection.
4168          */
4169         if (atomic_read(&conn->connection_recovery))
4170                 iscsit_build_conn_drop_async_message(conn);
4171
4172         spin_unlock_bh(&sess->conn_lock);
4173
4174         /*
4175          * If connection reinstatement is being performed on this connection,
4176          * up the connection reinstatement semaphore that is being blocked on
4177          * in iscsit_cause_connection_reinstatement().
4178          */
4179         spin_lock_bh(&conn->state_lock);
4180         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4181                 spin_unlock_bh(&conn->state_lock);
4182                 complete(&conn->conn_wait_comp);
4183                 wait_for_completion(&conn->conn_post_wait_comp);
4184                 spin_lock_bh(&conn->state_lock);
4185         }
4186
4187         /*
4188          * If connection reinstatement is being performed on this connection
4189          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4190          * connection wait rcfr semaphore that is being blocked on
4191          * an iscsit_connection_reinstatement_rcfr().
4192          */
4193         if (atomic_read(&conn->connection_wait_rcfr)) {
4194                 spin_unlock_bh(&conn->state_lock);
4195                 complete(&conn->conn_wait_rcfr_comp);
4196                 wait_for_completion(&conn->conn_post_wait_comp);
4197                 spin_lock_bh(&conn->state_lock);
4198         }
4199         atomic_set(&conn->connection_reinstatement, 1);
4200         spin_unlock_bh(&conn->state_lock);
4201
4202         /*
4203          * If any other processes are accessing this connection pointer we
4204          * must wait until they have completed.
4205          */
4206         iscsit_check_conn_usage_count(conn);
4207
4208         ahash_request_free(conn->conn_tx_hash);
4209         if (conn->conn_rx_hash) {
4210                 struct crypto_ahash *tfm;
4211
4212                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4213                 ahash_request_free(conn->conn_rx_hash);
4214                 crypto_free_ahash(tfm);
4215         }
4216
4217         if (conn->sock)
4218                 sock_release(conn->sock);
4219
4220         if (conn->conn_transport->iscsit_free_conn)
4221                 conn->conn_transport->iscsit_free_conn(conn);
4222
4223         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4224         conn->conn_state = TARG_CONN_STATE_FREE;
4225         iscsit_free_conn(conn);
4226
4227         spin_lock_bh(&sess->conn_lock);
4228         atomic_dec(&sess->nconn);
4229         pr_debug("Decremented iSCSI connection count to %hu from node:"
4230                 " %s\n", atomic_read(&sess->nconn),
4231                 sess->sess_ops->InitiatorName);
4232         /*
4233          * Make sure that if one connection fails in an non ERL=2 iSCSI
4234          * Session that they all fail.
4235          */
4236         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4237              !atomic_read(&sess->session_logout))
4238                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4239
4240         /*
4241          * If this was not the last connection in the session, and we are
4242          * performing session reinstatement or falling back to ERL=0, call
4243          * iscsit_stop_session() without sleeping to shutdown the other
4244          * active connections.
4245          */
4246         if (atomic_read(&sess->nconn)) {
4247                 if (!atomic_read(&sess->session_reinstatement) &&
4248                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4249                         spin_unlock_bh(&sess->conn_lock);
4250                         return 0;
4251                 }
4252                 if (!atomic_read(&sess->session_stop_active)) {
4253                         atomic_set(&sess->session_stop_active, 1);
4254                         spin_unlock_bh(&sess->conn_lock);
4255                         iscsit_stop_session(sess, 0, 0);
4256                         return 0;
4257                 }
4258                 spin_unlock_bh(&sess->conn_lock);
4259                 return 0;
4260         }
4261
4262         /*
4263          * If this was the last connection in the session and one of the
4264          * following is occurring:
4265          *
4266          * Session Reinstatement is not being performed, and are falling back
4267          * to ERL=0 call iscsit_close_session().
4268          *
4269          * Session Logout was requested.  iscsit_close_session() will be called
4270          * elsewhere.
4271          *
4272          * Session Continuation is not being performed, start the Time2Retain
4273          * handler and check if sleep_on_sess_wait_sem is active.
4274          */
4275         if (!atomic_read(&sess->session_reinstatement) &&
4276              atomic_read(&sess->session_fall_back_to_erl0)) {
4277                 spin_unlock_bh(&sess->conn_lock);
4278                 iscsit_close_session(sess);
4279
4280                 return 0;
4281         } else if (atomic_read(&sess->session_logout)) {
4282                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4283                 sess->session_state = TARG_SESS_STATE_FREE;
4284                 spin_unlock_bh(&sess->conn_lock);
4285
4286                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4287                         complete(&sess->session_wait_comp);
4288
4289                 return 0;
4290         } else {
4291                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4292                 sess->session_state = TARG_SESS_STATE_FAILED;
4293
4294                 if (!atomic_read(&sess->session_continuation)) {
4295                         spin_unlock_bh(&sess->conn_lock);
4296                         iscsit_start_time2retain_handler(sess);
4297                 } else
4298                         spin_unlock_bh(&sess->conn_lock);
4299
4300                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4301                         complete(&sess->session_wait_comp);
4302
4303                 return 0;
4304         }
4305 }
4306
4307 /*
4308  * If the iSCSI Session for the iSCSI Initiator Node exists,
4309  * forcefully shutdown the iSCSI NEXUS.
4310  */
4311 int iscsit_close_session(struct iscsi_session *sess)
4312 {
4313         struct iscsi_portal_group *tpg = sess->tpg;
4314         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4315
4316         if (atomic_read(&sess->nconn)) {
4317                 pr_err("%d connection(s) still exist for iSCSI session"
4318                         " to %s\n", atomic_read(&sess->nconn),
4319                         sess->sess_ops->InitiatorName);
4320                 BUG();
4321         }
4322
4323         spin_lock_bh(&se_tpg->session_lock);
4324         atomic_set(&sess->session_logout, 1);
4325         atomic_set(&sess->session_reinstatement, 1);
4326         iscsit_stop_time2retain_timer(sess);
4327         spin_unlock_bh(&se_tpg->session_lock);
4328
4329         /*
4330          * transport_deregister_session_configfs() will clear the
4331          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4332          * can be setting it again with __transport_register_session() in
4333          * iscsi_post_login_handler() again after the iscsit_stop_session()
4334          * completes in iscsi_np context.
4335          */
4336         transport_deregister_session_configfs(sess->se_sess);
4337
4338         /*
4339          * If any other processes are accessing this session pointer we must
4340          * wait until they have completed.  If we are in an interrupt (the
4341          * time2retain handler) and contain and active session usage count we
4342          * restart the timer and exit.
4343          */
4344         if (!in_interrupt()) {
4345                 if (iscsit_check_session_usage_count(sess) == 1)
4346                         iscsit_stop_session(sess, 1, 1);
4347         } else {
4348                 if (iscsit_check_session_usage_count(sess) == 2) {
4349                         atomic_set(&sess->session_logout, 0);
4350                         iscsit_start_time2retain_handler(sess);
4351                         return 0;
4352                 }
4353         }
4354
4355         transport_deregister_session(sess->se_sess);
4356
4357         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4358                 iscsit_free_connection_recovery_entires(sess);
4359
4360         iscsit_free_all_ooo_cmdsns(sess);
4361
4362         spin_lock_bh(&se_tpg->session_lock);
4363         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4364         sess->session_state = TARG_SESS_STATE_FREE;
4365         pr_debug("Released iSCSI session from node: %s\n",
4366                         sess->sess_ops->InitiatorName);
4367         tpg->nsessions--;
4368         if (tpg->tpg_tiqn)
4369                 tpg->tpg_tiqn->tiqn_nsessions--;
4370
4371         pr_debug("Decremented number of active iSCSI Sessions on"
4372                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4373
4374         ida_free(&sess_ida, sess->session_index);
4375         kfree(sess->sess_ops);
4376         sess->sess_ops = NULL;
4377         spin_unlock_bh(&se_tpg->session_lock);
4378
4379         kfree(sess);
4380         return 0;
4381 }
4382
4383 static void iscsit_logout_post_handler_closesession(
4384         struct iscsi_conn *conn)
4385 {
4386         struct iscsi_session *sess = conn->sess;
4387         int sleep = 1;
4388         /*
4389          * Traditional iscsi/tcp will invoke this logic from TX thread
4390          * context during session logout, so clear tx_thread_active and
4391          * sleep if iscsit_close_connection() has not already occured.
4392          *
4393          * Since iser-target invokes this logic from it's own workqueue,
4394          * always sleep waiting for RX/TX thread shutdown to complete
4395          * within iscsit_close_connection().
4396          */
4397         if (!conn->conn_transport->rdma_shutdown) {
4398                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4399                 if (!sleep)
4400                         return;
4401         }
4402
4403         atomic_set(&conn->conn_logout_remove, 0);
4404         complete(&conn->conn_logout_comp);
4405
4406         iscsit_dec_conn_usage_count(conn);
4407         iscsit_stop_session(sess, sleep, sleep);
4408         iscsit_dec_session_usage_count(sess);
4409         iscsit_close_session(sess);
4410 }
4411
4412 static void iscsit_logout_post_handler_samecid(
4413         struct iscsi_conn *conn)
4414 {
4415         int sleep = 1;
4416
4417         if (!conn->conn_transport->rdma_shutdown) {
4418                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4419                 if (!sleep)
4420                         return;
4421         }
4422
4423         atomic_set(&conn->conn_logout_remove, 0);
4424         complete(&conn->conn_logout_comp);
4425
4426         iscsit_cause_connection_reinstatement(conn, sleep);
4427         iscsit_dec_conn_usage_count(conn);
4428 }
4429
4430 static void iscsit_logout_post_handler_diffcid(
4431         struct iscsi_conn *conn,
4432         u16 cid)
4433 {
4434         struct iscsi_conn *l_conn;
4435         struct iscsi_session *sess = conn->sess;
4436         bool conn_found = false;
4437
4438         if (!sess)
4439                 return;
4440
4441         spin_lock_bh(&sess->conn_lock);
4442         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4443                 if (l_conn->cid == cid) {
4444                         iscsit_inc_conn_usage_count(l_conn);
4445                         conn_found = true;
4446                         break;
4447                 }
4448         }
4449         spin_unlock_bh(&sess->conn_lock);
4450
4451         if (!conn_found)
4452                 return;
4453
4454         if (l_conn->sock)
4455                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4456
4457         spin_lock_bh(&l_conn->state_lock);
4458         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4459         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4460         spin_unlock_bh(&l_conn->state_lock);
4461
4462         iscsit_cause_connection_reinstatement(l_conn, 1);
4463         iscsit_dec_conn_usage_count(l_conn);
4464 }
4465
4466 /*
4467  *      Return of 0 causes the TX thread to restart.
4468  */
4469 int iscsit_logout_post_handler(
4470         struct iscsi_cmd *cmd,
4471         struct iscsi_conn *conn)
4472 {
4473         int ret = 0;
4474
4475         switch (cmd->logout_reason) {
4476         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4477                 switch (cmd->logout_response) {
4478                 case ISCSI_LOGOUT_SUCCESS:
4479                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4480                 default:
4481                         iscsit_logout_post_handler_closesession(conn);
4482                         break;
4483                 }
4484                 ret = 0;
4485                 break;
4486         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4487                 if (conn->cid == cmd->logout_cid) {
4488                         switch (cmd->logout_response) {
4489                         case ISCSI_LOGOUT_SUCCESS:
4490                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4491                         default:
4492                                 iscsit_logout_post_handler_samecid(conn);
4493                                 break;
4494                         }
4495                         ret = 0;
4496                 } else {
4497                         switch (cmd->logout_response) {
4498                         case ISCSI_LOGOUT_SUCCESS:
4499                                 iscsit_logout_post_handler_diffcid(conn,
4500                                         cmd->logout_cid);
4501                                 break;
4502                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4503                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4504                         default:
4505                                 break;
4506                         }
4507                         ret = 1;
4508                 }
4509                 break;
4510         case ISCSI_LOGOUT_REASON_RECOVERY:
4511                 switch (cmd->logout_response) {
4512                 case ISCSI_LOGOUT_SUCCESS:
4513                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4514                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4515                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4516                 default:
4517                         break;
4518                 }
4519                 ret = 1;
4520                 break;
4521         default:
4522                 break;
4523
4524         }
4525         return ret;
4526 }
4527 EXPORT_SYMBOL(iscsit_logout_post_handler);
4528
4529 void iscsit_fail_session(struct iscsi_session *sess)
4530 {
4531         struct iscsi_conn *conn;
4532
4533         spin_lock_bh(&sess->conn_lock);
4534         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4535                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4536                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4537         }
4538         spin_unlock_bh(&sess->conn_lock);
4539
4540         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4541         sess->session_state = TARG_SESS_STATE_FAILED;
4542 }
4543
4544 int iscsit_free_session(struct iscsi_session *sess)
4545 {
4546         u16 conn_count = atomic_read(&sess->nconn);
4547         struct iscsi_conn *conn, *conn_tmp = NULL;
4548         int is_last;
4549
4550         spin_lock_bh(&sess->conn_lock);
4551         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4552
4553         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4554                         conn_list) {
4555                 if (conn_count == 0)
4556                         break;
4557
4558                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4559                         is_last = 1;
4560                 } else {
4561                         iscsit_inc_conn_usage_count(conn_tmp);
4562                         is_last = 0;
4563                 }
4564                 iscsit_inc_conn_usage_count(conn);
4565
4566                 spin_unlock_bh(&sess->conn_lock);
4567                 iscsit_cause_connection_reinstatement(conn, 1);
4568                 spin_lock_bh(&sess->conn_lock);
4569
4570                 iscsit_dec_conn_usage_count(conn);
4571                 if (is_last == 0)
4572                         iscsit_dec_conn_usage_count(conn_tmp);
4573
4574                 conn_count--;
4575         }
4576
4577         if (atomic_read(&sess->nconn)) {
4578                 spin_unlock_bh(&sess->conn_lock);
4579                 wait_for_completion(&sess->session_wait_comp);
4580         } else
4581                 spin_unlock_bh(&sess->conn_lock);
4582
4583         iscsit_close_session(sess);
4584         return 0;
4585 }
4586
4587 void iscsit_stop_session(
4588         struct iscsi_session *sess,
4589         int session_sleep,
4590         int connection_sleep)
4591 {
4592         u16 conn_count = atomic_read(&sess->nconn);
4593         struct iscsi_conn *conn, *conn_tmp = NULL;
4594         int is_last;
4595
4596         spin_lock_bh(&sess->conn_lock);
4597         if (session_sleep)
4598                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4599
4600         if (connection_sleep) {
4601                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4602                                 conn_list) {
4603                         if (conn_count == 0)
4604                                 break;
4605
4606                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4607                                 is_last = 1;
4608                         } else {
4609                                 iscsit_inc_conn_usage_count(conn_tmp);
4610                                 is_last = 0;
4611                         }
4612                         iscsit_inc_conn_usage_count(conn);
4613
4614                         spin_unlock_bh(&sess->conn_lock);
4615                         iscsit_cause_connection_reinstatement(conn, 1);
4616                         spin_lock_bh(&sess->conn_lock);
4617
4618                         iscsit_dec_conn_usage_count(conn);
4619                         if (is_last == 0)
4620                                 iscsit_dec_conn_usage_count(conn_tmp);
4621                         conn_count--;
4622                 }
4623         } else {
4624                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4625                         iscsit_cause_connection_reinstatement(conn, 0);
4626         }
4627
4628         if (session_sleep && atomic_read(&sess->nconn)) {
4629                 spin_unlock_bh(&sess->conn_lock);
4630                 wait_for_completion(&sess->session_wait_comp);
4631         } else
4632                 spin_unlock_bh(&sess->conn_lock);
4633 }
4634
4635 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4636 {
4637         struct iscsi_session *sess;
4638         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4639         struct se_session *se_sess, *se_sess_tmp;
4640         LIST_HEAD(free_list);
4641         int session_count = 0;
4642
4643         spin_lock_bh(&se_tpg->session_lock);
4644         if (tpg->nsessions && !force) {
4645                 spin_unlock_bh(&se_tpg->session_lock);
4646                 return -1;
4647         }
4648
4649         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4650                         sess_list) {
4651                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4652
4653                 spin_lock(&sess->conn_lock);
4654                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4655                     atomic_read(&sess->session_logout) ||
4656                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4657                         spin_unlock(&sess->conn_lock);
4658                         continue;
4659                 }
4660                 atomic_set(&sess->session_reinstatement, 1);
4661                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4662                 spin_unlock(&sess->conn_lock);
4663
4664                 list_move_tail(&se_sess->sess_list, &free_list);
4665         }
4666         spin_unlock_bh(&se_tpg->session_lock);
4667
4668         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4669                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4670
4671                 iscsit_free_session(sess);
4672                 session_count++;
4673         }
4674
4675         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4676                         " Group: %hu\n", session_count, tpg->tpgt);
4677         return 0;
4678 }
4679
4680 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4681 MODULE_VERSION("4.1.x");
4682 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4683 MODULE_LICENSE("GPL");
4684
4685 module_init(iscsi_target_init_module);
4686 module_exit(iscsi_target_cleanup_module);