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         sg_set_buf(sg + 1, pad_bytes, padding);
1420
1421         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1422
1423         crypto_ahash_digest(hash);
1424 }
1425
1426 int
1427 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1428                            struct iscsi_cmd *cmd, u32 payload_length,
1429                            bool *success)
1430 {
1431         struct iscsi_data *hdr = buf;
1432         struct se_cmd *se_cmd;
1433         int rc;
1434
1435         /* iSCSI write */
1436         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1437
1438         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1439                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1440                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1441                 payload_length, conn->cid);
1442
1443         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1444                 pr_err("Command ITT: 0x%08x received DataOUT after"
1445                         " last DataOUT received, dumping payload\n",
1446                         cmd->init_task_tag);
1447                 return iscsit_dump_data_payload(conn, payload_length, 1);
1448         }
1449
1450         if (cmd->data_direction != DMA_TO_DEVICE) {
1451                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1452                         " NON-WRITE command.\n", cmd->init_task_tag);
1453                 return iscsit_dump_data_payload(conn, payload_length, 1);
1454         }
1455         se_cmd = &cmd->se_cmd;
1456         iscsit_mod_dataout_timer(cmd);
1457
1458         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1459                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1460                        be32_to_cpu(hdr->offset), payload_length,
1461                        cmd->se_cmd.data_length);
1462                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1463         }
1464
1465         if (cmd->unsolicited_data) {
1466                 int dump_unsolicited_data = 0;
1467
1468                 if (conn->sess->sess_ops->InitialR2T) {
1469                         pr_err("Received unexpected unsolicited data"
1470                                 " while InitialR2T=Yes, protocol error.\n");
1471                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1472                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1473                         return -1;
1474                 }
1475                 /*
1476                  * Special case for dealing with Unsolicited DataOUT
1477                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1478                  * failures;
1479                  */
1480
1481                 /* Something's amiss if we're not in WRITE_PENDING state... */
1482                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1483                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1484                         dump_unsolicited_data = 1;
1485
1486                 if (dump_unsolicited_data) {
1487                         /*
1488                          * Check if a delayed TASK_ABORTED status needs to
1489                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1490                          * received with the unsolicited data out.
1491                          */
1492                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1493                                 iscsit_stop_dataout_timer(cmd);
1494
1495                         transport_check_aborted_status(se_cmd,
1496                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1497                         return iscsit_dump_data_payload(conn, payload_length, 1);
1498                 }
1499         } else {
1500                 /*
1501                  * For the normal solicited data path:
1502                  *
1503                  * Check for a delayed TASK_ABORTED status and dump any
1504                  * incoming data out payload if one exists.  Also, when the
1505                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1506                  * data out sequence, we decrement outstanding_r2ts.  Once
1507                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1508                  * TASK_ABORTED status.
1509                  */
1510                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1511                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1512                                 if (--cmd->outstanding_r2ts < 1) {
1513                                         iscsit_stop_dataout_timer(cmd);
1514                                         transport_check_aborted_status(
1515                                                         se_cmd, 1);
1516                                 }
1517
1518                         return iscsit_dump_data_payload(conn, payload_length, 1);
1519                 }
1520         }
1521         /*
1522          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1523          * within-command recovery checks before receiving the payload.
1524          */
1525         rc = iscsit_check_pre_dataout(cmd, buf);
1526         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1527                 return 0;
1528         else if (rc == DATAOUT_CANNOT_RECOVER)
1529                 return -1;
1530         *success = true;
1531         return 0;
1532 }
1533 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1534
1535 int
1536 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1537                          struct iscsi_cmd **out_cmd)
1538 {
1539         struct iscsi_data *hdr = buf;
1540         struct iscsi_cmd *cmd;
1541         u32 payload_length = ntoh24(hdr->dlength);
1542         int rc;
1543         bool success = false;
1544
1545         if (!payload_length) {
1546                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1547                 return 0;
1548         }
1549
1550         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1551                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1552                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1553                         conn->conn_ops->MaxXmitDataSegmentLength);
1554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1555         }
1556
1557         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1558         if (!cmd)
1559                 return 0;
1560
1561         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1562
1563         if (success)
1564                 *out_cmd = cmd;
1565
1566         return rc;
1567 }
1568 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1569
1570 static int
1571 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1572                    struct iscsi_data *hdr)
1573 {
1574         struct kvec *iov;
1575         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1576         u32 payload_length = ntoh24(hdr->dlength);
1577         int iov_ret, data_crc_failed = 0;
1578
1579         rx_size += payload_length;
1580         iov = &cmd->iov_data[0];
1581
1582         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1583                                    payload_length);
1584         if (iov_ret < 0)
1585                 return -1;
1586
1587         iov_count += iov_ret;
1588
1589         padding = ((-payload_length) & 3);
1590         if (padding != 0) {
1591                 iov[iov_count].iov_base = cmd->pad_bytes;
1592                 iov[iov_count++].iov_len = padding;
1593                 rx_size += padding;
1594                 pr_debug("Receiving %u padding bytes.\n", padding);
1595         }
1596
1597         if (conn->conn_ops->DataDigest) {
1598                 iov[iov_count].iov_base = &checksum;
1599                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1600                 rx_size += ISCSI_CRC_LEN;
1601         }
1602
1603         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1604
1605         iscsit_unmap_iovec(cmd);
1606
1607         if (rx_got != rx_size)
1608                 return -1;
1609
1610         if (conn->conn_ops->DataDigest) {
1611                 u32 data_crc;
1612
1613                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1614                                                     be32_to_cpu(hdr->offset),
1615                                                     payload_length, padding,
1616                                                     cmd->pad_bytes);
1617
1618                 if (checksum != data_crc) {
1619                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1620                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1621                                 " does not match computed 0x%08x\n",
1622                                 hdr->itt, hdr->offset, payload_length,
1623                                 hdr->datasn, checksum, data_crc);
1624                         data_crc_failed = 1;
1625                 } else {
1626                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1627                                 " %u bytes of Data Out\n", checksum,
1628                                 payload_length);
1629                 }
1630         }
1631
1632         return data_crc_failed;
1633 }
1634
1635 int
1636 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1637                              bool data_crc_failed)
1638 {
1639         struct iscsi_conn *conn = cmd->conn;
1640         int rc, ooo_cmdsn;
1641         /*
1642          * Increment post receive data and CRC values or perform
1643          * within-command recovery.
1644          */
1645         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1646         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1647                 return 0;
1648         else if (rc == DATAOUT_SEND_R2T) {
1649                 iscsit_set_dataout_sequence_values(cmd);
1650                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1651         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1652                 /*
1653                  * Handle extra special case for out of order
1654                  * Unsolicited Data Out.
1655                  */
1656                 spin_lock_bh(&cmd->istate_lock);
1657                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1658                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1659                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1660                 spin_unlock_bh(&cmd->istate_lock);
1661
1662                 iscsit_stop_dataout_timer(cmd);
1663                 if (ooo_cmdsn)
1664                         return 0;
1665                 target_execute_cmd(&cmd->se_cmd);
1666                 return 0;
1667         } else /* DATAOUT_CANNOT_RECOVER */
1668                 return -1;
1669
1670         return 0;
1671 }
1672 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1673
1674 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1675 {
1676         struct iscsi_cmd *cmd = NULL;
1677         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1678         int rc;
1679         bool data_crc_failed = false;
1680
1681         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1682         if (rc < 0)
1683                 return 0;
1684         else if (!cmd)
1685                 return 0;
1686
1687         rc = iscsit_get_dataout(conn, cmd, hdr);
1688         if (rc < 0)
1689                 return rc;
1690         else if (rc > 0)
1691                 data_crc_failed = true;
1692
1693         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1694 }
1695
1696 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1697                          struct iscsi_nopout *hdr)
1698 {
1699         u32 payload_length = ntoh24(hdr->dlength);
1700
1701         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1702                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1703                 if (!cmd)
1704                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1705                                                  (unsigned char *)hdr);
1706
1707                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1708                                          (unsigned char *)hdr);
1709         }
1710
1711         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1712                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1713                         " not set, protocol error.\n");
1714                 if (!cmd)
1715                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1716                                                  (unsigned char *)hdr);
1717
1718                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1719                                          (unsigned char *)hdr);
1720         }
1721
1722         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1723                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1724                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1725                         " error.\n", payload_length,
1726                         conn->conn_ops->MaxXmitDataSegmentLength);
1727                 if (!cmd)
1728                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1729                                                  (unsigned char *)hdr);
1730
1731                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1732                                          (unsigned char *)hdr);
1733         }
1734
1735         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1736                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1737                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1738                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1739                 payload_length);
1740         /*
1741          * This is not a response to a Unsolicited NopIN, which means
1742          * it can either be a NOPOUT ping request (with a valid ITT),
1743          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1744          * Either way, make sure we allocate an struct iscsi_cmd, as both
1745          * can contain ping data.
1746          */
1747         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1748                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1749                 cmd->i_state            = ISTATE_SEND_NOPIN;
1750                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1751                                                 1 : 0);
1752                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1753                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1754                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1755                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1756                 cmd->data_direction     = DMA_NONE;
1757         }
1758
1759         return 0;
1760 }
1761 EXPORT_SYMBOL(iscsit_setup_nop_out);
1762
1763 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1764                            struct iscsi_nopout *hdr)
1765 {
1766         struct iscsi_cmd *cmd_p = NULL;
1767         int cmdsn_ret = 0;
1768         /*
1769          * Initiator is expecting a NopIN ping reply..
1770          */
1771         if (hdr->itt != RESERVED_ITT) {
1772                 if (!cmd)
1773                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1774                                                 (unsigned char *)hdr);
1775
1776                 spin_lock_bh(&conn->cmd_lock);
1777                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1778                 spin_unlock_bh(&conn->cmd_lock);
1779
1780                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1781
1782                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1783                         iscsit_add_cmd_to_response_queue(cmd, conn,
1784                                                          cmd->i_state);
1785                         return 0;
1786                 }
1787
1788                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1789                                 (unsigned char *)hdr, hdr->cmdsn);
1790                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1791                         return 0;
1792                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1793                         return -1;
1794
1795                 return 0;
1796         }
1797         /*
1798          * This was a response to a unsolicited NOPIN ping.
1799          */
1800         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1801                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1802                 if (!cmd_p)
1803                         return -EINVAL;
1804
1805                 iscsit_stop_nopin_response_timer(conn);
1806
1807                 cmd_p->i_state = ISTATE_REMOVE;
1808                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1809
1810                 iscsit_start_nopin_timer(conn);
1811                 return 0;
1812         }
1813         /*
1814          * Otherwise, initiator is not expecting a NOPIN is response.
1815          * Just ignore for now.
1816          */
1817
1818         if (cmd)
1819                 iscsit_free_cmd(cmd, false);
1820
1821         return 0;
1822 }
1823 EXPORT_SYMBOL(iscsit_process_nop_out);
1824
1825 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1826                                  unsigned char *buf)
1827 {
1828         unsigned char *ping_data = NULL;
1829         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1830         struct kvec *iov = NULL;
1831         u32 payload_length = ntoh24(hdr->dlength);
1832         int ret;
1833
1834         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1835         if (ret < 0)
1836                 return 0;
1837         /*
1838          * Handle NOP-OUT payload for traditional iSCSI sockets
1839          */
1840         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1841                 u32 checksum, data_crc, padding = 0;
1842                 int niov = 0, rx_got, rx_size = payload_length;
1843
1844                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1845                 if (!ping_data) {
1846                         ret = -1;
1847                         goto out;
1848                 }
1849
1850                 iov = &cmd->iov_misc[0];
1851                 iov[niov].iov_base      = ping_data;
1852                 iov[niov++].iov_len     = payload_length;
1853
1854                 padding = ((-payload_length) & 3);
1855                 if (padding != 0) {
1856                         pr_debug("Receiving %u additional bytes"
1857                                 " for padding.\n", padding);
1858                         iov[niov].iov_base      = &cmd->pad_bytes;
1859                         iov[niov++].iov_len     = padding;
1860                         rx_size += padding;
1861                 }
1862                 if (conn->conn_ops->DataDigest) {
1863                         iov[niov].iov_base      = &checksum;
1864                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1865                         rx_size += ISCSI_CRC_LEN;
1866                 }
1867
1868                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1869                 if (rx_got != rx_size) {
1870                         ret = -1;
1871                         goto out;
1872                 }
1873
1874                 if (conn->conn_ops->DataDigest) {
1875                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1876                                                   payload_length, padding,
1877                                                   cmd->pad_bytes, &data_crc);
1878
1879                         if (checksum != data_crc) {
1880                                 pr_err("Ping data CRC32C DataDigest"
1881                                 " 0x%08x does not match computed 0x%08x\n",
1882                                         checksum, data_crc);
1883                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1884                                         pr_err("Unable to recover from"
1885                                         " NOPOUT Ping DataCRC failure while in"
1886                                                 " ERL=0.\n");
1887                                         ret = -1;
1888                                         goto out;
1889                                 } else {
1890                                         /*
1891                                          * Silently drop this PDU and let the
1892                                          * initiator plug the CmdSN gap.
1893                                          */
1894                                         pr_debug("Dropping NOPOUT"
1895                                         " Command CmdSN: 0x%08x due to"
1896                                         " DataCRC error.\n", hdr->cmdsn);
1897                                         ret = 0;
1898                                         goto out;
1899                                 }
1900                         } else {
1901                                 pr_debug("Got CRC32C DataDigest"
1902                                 " 0x%08x for %u bytes of ping data.\n",
1903                                         checksum, payload_length);
1904                         }
1905                 }
1906
1907                 ping_data[payload_length] = '\0';
1908                 /*
1909                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1910                  */
1911                 cmd->buf_ptr = ping_data;
1912                 cmd->buf_ptr_size = payload_length;
1913
1914                 pr_debug("Got %u bytes of NOPOUT ping"
1915                         " data.\n", payload_length);
1916                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1917         }
1918
1919         return iscsit_process_nop_out(conn, cmd, hdr);
1920 out:
1921         if (cmd)
1922                 iscsit_free_cmd(cmd, false);
1923
1924         kfree(ping_data);
1925         return ret;
1926 }
1927
1928 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1929 {
1930         switch (iscsi_tmf) {
1931         case ISCSI_TM_FUNC_ABORT_TASK:
1932                 return TMR_ABORT_TASK;
1933         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1934                 return TMR_ABORT_TASK_SET;
1935         case ISCSI_TM_FUNC_CLEAR_ACA:
1936                 return TMR_CLEAR_ACA;
1937         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1938                 return TMR_CLEAR_TASK_SET;
1939         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1940                 return TMR_LUN_RESET;
1941         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1942                 return TMR_TARGET_WARM_RESET;
1943         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1944                 return TMR_TARGET_COLD_RESET;
1945         default:
1946                 return TMR_UNKNOWN;
1947         }
1948 }
1949
1950 int
1951 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1952                            unsigned char *buf)
1953 {
1954         struct se_tmr_req *se_tmr;
1955         struct iscsi_tmr_req *tmr_req;
1956         struct iscsi_tm *hdr;
1957         int out_of_order_cmdsn = 0, ret;
1958         u8 function, tcm_function = TMR_UNKNOWN;
1959
1960         hdr                     = (struct iscsi_tm *) buf;
1961         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1962         function = hdr->flags;
1963
1964         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1965                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1966                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1967                 hdr->rtt, hdr->refcmdsn, conn->cid);
1968
1969         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1970             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1971              hdr->rtt != RESERVED_ITT)) {
1972                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1973                 hdr->rtt = RESERVED_ITT;
1974         }
1975
1976         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1977                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1978                 pr_err("Task Management Request TASK_REASSIGN not"
1979                         " issued as immediate command, bad iSCSI Initiator"
1980                                 "implementation\n");
1981                 return iscsit_add_reject_cmd(cmd,
1982                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1983         }
1984         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1985             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1986                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1987
1988         cmd->data_direction = DMA_NONE;
1989         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1990         if (!cmd->tmr_req) {
1991                 return iscsit_add_reject_cmd(cmd,
1992                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1993                                              buf);
1994         }
1995
1996         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1997                               conn->sess->se_sess, 0, DMA_NONE,
1998                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1999
2000         target_get_sess_cmd(&cmd->se_cmd, true);
2001
2002         /*
2003          * TASK_REASSIGN for ERL=2 / connection stays inside of
2004          * LIO-Target $FABRIC_MOD
2005          */
2006         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2007                 tcm_function = iscsit_convert_tmf(function);
2008                 if (tcm_function == TMR_UNKNOWN) {
2009                         pr_err("Unknown iSCSI TMR Function:"
2010                                " 0x%02x\n", function);
2011                         return iscsit_add_reject_cmd(cmd,
2012                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2013                 }
2014         }
2015         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2016                                  GFP_KERNEL);
2017         if (ret < 0)
2018                 return iscsit_add_reject_cmd(cmd,
2019                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2020
2021         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2022
2023         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2024         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2025         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2026         cmd->init_task_tag      = hdr->itt;
2027         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2028         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2029         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2030         se_tmr                  = cmd->se_cmd.se_tmr_req;
2031         tmr_req                 = cmd->tmr_req;
2032         /*
2033          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2034          */
2035         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2036                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2037                                                scsilun_to_int(&hdr->lun));
2038                 if (ret < 0) {
2039                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2040                         goto attach;
2041                 }
2042         }
2043
2044         switch (function) {
2045         case ISCSI_TM_FUNC_ABORT_TASK:
2046                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2047                 if (se_tmr->response)
2048                         goto attach;
2049                 break;
2050         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2051         case ISCSI_TM_FUNC_CLEAR_ACA:
2052         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2053         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2054                 break;
2055         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2056                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2057                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2058                         goto attach;
2059                 }
2060                 break;
2061         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2062                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2063                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2064                         goto attach;
2065                 }
2066                 break;
2067         case ISCSI_TM_FUNC_TASK_REASSIGN:
2068                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2069                 /*
2070                  * Perform sanity checks on the ExpDataSN only if the
2071                  * TASK_REASSIGN was successful.
2072                  */
2073                 if (se_tmr->response)
2074                         break;
2075
2076                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2077                         return iscsit_add_reject_cmd(cmd,
2078                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2079                 break;
2080         default:
2081                 pr_err("Unknown TMR function: 0x%02x, protocol"
2082                         " error.\n", function);
2083                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2084                 goto attach;
2085         }
2086
2087         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2088             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2089                 se_tmr->call_transport = 1;
2090 attach:
2091         spin_lock_bh(&conn->cmd_lock);
2092         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2093         spin_unlock_bh(&conn->cmd_lock);
2094
2095         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2096                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2097                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2098                         out_of_order_cmdsn = 1;
2099                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2100                         target_put_sess_cmd(&cmd->se_cmd);
2101                         return 0;
2102                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2103                         return -1;
2104                 }
2105         }
2106         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2107
2108         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2109                 return 0;
2110         /*
2111          * Found the referenced task, send to transport for processing.
2112          */
2113         if (se_tmr->call_transport)
2114                 return transport_generic_handle_tmr(&cmd->se_cmd);
2115
2116         /*
2117          * Could not find the referenced LUN, task, or Task Management
2118          * command not authorized or supported.  Change state and
2119          * let the tx_thread send the response.
2120          *
2121          * For connection recovery, this is also the default action for
2122          * TMR TASK_REASSIGN.
2123          */
2124         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2125         target_put_sess_cmd(&cmd->se_cmd);
2126         return 0;
2127 }
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2129
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2131 int
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133                       struct iscsi_text *hdr)
2134 {
2135         u32 payload_length = ntoh24(hdr->dlength);
2136
2137         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138                 pr_err("Unable to accept text parameter length: %u"
2139                         "greater than MaxXmitDataSegmentLength %u.\n",
2140                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142                                          (unsigned char *)hdr);
2143         }
2144
2145         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147                 pr_err("Multi sequence text commands currently not supported\n");
2148                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149                                         (unsigned char *)hdr);
2150         }
2151
2152         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154                 hdr->exp_statsn, payload_length);
2155
2156         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2157         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2158         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2160         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2161         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2162         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2163         cmd->data_direction     = DMA_NONE;
2164         kfree(cmd->text_in_ptr);
2165         cmd->text_in_ptr        = NULL;
2166
2167         return 0;
2168 }
2169 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2170
2171 int
2172 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2173                         struct iscsi_text *hdr)
2174 {
2175         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2176         int cmdsn_ret;
2177
2178         if (!text_in) {
2179                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2180                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2181                         pr_err("Unable to locate text_in buffer for sendtargets"
2182                                " discovery\n");
2183                         goto reject;
2184                 }
2185                 goto empty_sendtargets;
2186         }
2187         if (strncmp("SendTargets", text_in, 11) != 0) {
2188                 pr_err("Received Text Data that is not"
2189                         " SendTargets, cannot continue.\n");
2190                 goto reject;
2191         }
2192         text_ptr = strchr(text_in, '=');
2193         if (!text_ptr) {
2194                 pr_err("No \"=\" separator found in Text Data,"
2195                         "  cannot continue.\n");
2196                 goto reject;
2197         }
2198         if (!strncmp("=All", text_ptr, 4)) {
2199                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2200         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2201                    !strncmp("=eui.", text_ptr, 5)) {
2202                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2203         } else {
2204                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2205                 goto reject;
2206         }
2207
2208         spin_lock_bh(&conn->cmd_lock);
2209         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2210         spin_unlock_bh(&conn->cmd_lock);
2211
2212 empty_sendtargets:
2213         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2214
2215         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2216                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2217                                 (unsigned char *)hdr, hdr->cmdsn);
2218                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2219                         return -1;
2220
2221                 return 0;
2222         }
2223
2224         return iscsit_execute_cmd(cmd, 0);
2225
2226 reject:
2227         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2228                                  (unsigned char *)hdr);
2229 }
2230 EXPORT_SYMBOL(iscsit_process_text_cmd);
2231
2232 static int
2233 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2234                        unsigned char *buf)
2235 {
2236         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2237         char *text_in = NULL;
2238         u32 payload_length = ntoh24(hdr->dlength);
2239         int rx_size, rc;
2240
2241         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2242         if (rc < 0)
2243                 return 0;
2244
2245         rx_size = payload_length;
2246         if (payload_length) {
2247                 u32 checksum = 0, data_crc = 0;
2248                 u32 padding = 0, pad_bytes = 0;
2249                 int niov = 0, rx_got;
2250                 struct kvec iov[3];
2251
2252                 text_in = kzalloc(payload_length, GFP_KERNEL);
2253                 if (!text_in)
2254                         goto reject;
2255
2256                 cmd->text_in_ptr = text_in;
2257
2258                 memset(iov, 0, 3 * sizeof(struct kvec));
2259                 iov[niov].iov_base      = text_in;
2260                 iov[niov++].iov_len     = payload_length;
2261
2262                 padding = ((-payload_length) & 3);
2263                 if (padding != 0) {
2264                         iov[niov].iov_base = &pad_bytes;
2265                         iov[niov++].iov_len  = padding;
2266                         rx_size += padding;
2267                         pr_debug("Receiving %u additional bytes"
2268                                         " for padding.\n", padding);
2269                 }
2270                 if (conn->conn_ops->DataDigest) {
2271                         iov[niov].iov_base      = &checksum;
2272                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2273                         rx_size += ISCSI_CRC_LEN;
2274                 }
2275
2276                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2277                 if (rx_got != rx_size)
2278                         goto reject;
2279
2280                 if (conn->conn_ops->DataDigest) {
2281                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2282                                                   payload_length, padding,
2283                                                   &pad_bytes, &data_crc);
2284
2285                         if (checksum != data_crc) {
2286                                 pr_err("Text data CRC32C DataDigest"
2287                                         " 0x%08x does not match computed"
2288                                         " 0x%08x\n", checksum, data_crc);
2289                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2290                                         pr_err("Unable to recover from"
2291                                         " Text Data digest failure while in"
2292                                                 " ERL=0.\n");
2293                                         goto reject;
2294                                 } else {
2295                                         /*
2296                                          * Silently drop this PDU and let the
2297                                          * initiator plug the CmdSN gap.
2298                                          */
2299                                         pr_debug("Dropping Text"
2300                                         " Command CmdSN: 0x%08x due to"
2301                                         " DataCRC error.\n", hdr->cmdsn);
2302                                         kfree(text_in);
2303                                         return 0;
2304                                 }
2305                         } else {
2306                                 pr_debug("Got CRC32C DataDigest"
2307                                         " 0x%08x for %u bytes of text data.\n",
2308                                                 checksum, payload_length);
2309                         }
2310                 }
2311                 text_in[payload_length - 1] = '\0';
2312                 pr_debug("Successfully read %d bytes of text"
2313                                 " data.\n", payload_length);
2314         }
2315
2316         return iscsit_process_text_cmd(conn, cmd, hdr);
2317
2318 reject:
2319         kfree(cmd->text_in_ptr);
2320         cmd->text_in_ptr = NULL;
2321         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2322 }
2323
2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2325 {
2326         struct iscsi_conn *conn_p;
2327         struct iscsi_session *sess = conn->sess;
2328
2329         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2331
2332         atomic_set(&sess->session_logout, 1);
2333         atomic_set(&conn->conn_logout_remove, 1);
2334         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2335
2336         iscsit_inc_conn_usage_count(conn);
2337         iscsit_inc_session_usage_count(sess);
2338
2339         spin_lock_bh(&sess->conn_lock);
2340         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2341                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2342                         continue;
2343
2344                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2346         }
2347         spin_unlock_bh(&sess->conn_lock);
2348
2349         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2350
2351         return 0;
2352 }
2353
2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2355 {
2356         struct iscsi_conn *l_conn;
2357         struct iscsi_session *sess = conn->sess;
2358
2359         pr_debug("Received logout request CLOSECONNECTION for CID:"
2360                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2361
2362         /*
2363          * A Logout Request with a CLOSECONNECTION reason code for a CID
2364          * can arrive on a connection with a differing CID.
2365          */
2366         if (conn->cid == cmd->logout_cid) {
2367                 spin_lock_bh(&conn->state_lock);
2368                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2370
2371                 atomic_set(&conn->conn_logout_remove, 1);
2372                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2373                 iscsit_inc_conn_usage_count(conn);
2374
2375                 spin_unlock_bh(&conn->state_lock);
2376         } else {
2377                 /*
2378                  * Handle all different cid CLOSECONNECTION requests in
2379                  * iscsit_logout_post_handler_diffcid() as to give enough
2380                  * time for any non immediate command's CmdSN to be
2381                  * acknowledged on the connection in question.
2382                  *
2383                  * Here we simply make sure the CID is still around.
2384                  */
2385                 l_conn = iscsit_get_conn_from_cid(sess,
2386                                 cmd->logout_cid);
2387                 if (!l_conn) {
2388                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2389                         iscsit_add_cmd_to_response_queue(cmd, conn,
2390                                         cmd->i_state);
2391                         return 0;
2392                 }
2393
2394                 iscsit_dec_conn_usage_count(l_conn);
2395         }
2396
2397         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2398
2399         return 0;
2400 }
2401
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2403 {
2404         struct iscsi_session *sess = conn->sess;
2405
2406         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2408
2409         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2410                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411                         " while ERL!=2.\n");
2412                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2413                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414                 return 0;
2415         }
2416
2417         if (conn->cid == cmd->logout_cid) {
2418                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419                         " with CID: %hu on CID: %hu, implementation error.\n",
2420                                 cmd->logout_cid, conn->cid);
2421                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2422                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423                 return 0;
2424         }
2425
2426         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2427
2428         return 0;
2429 }
2430
2431 int
2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2433                         unsigned char *buf)
2434 {
2435         int cmdsn_ret, logout_remove = 0;
2436         u8 reason_code = 0;
2437         struct iscsi_logout *hdr;
2438         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2439
2440         hdr                     = (struct iscsi_logout *) buf;
2441         reason_code             = (hdr->flags & 0x7f);
2442
2443         if (tiqn) {
2444                 spin_lock(&tiqn->logout_stats.lock);
2445                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2446                         tiqn->logout_stats.normal_logouts++;
2447                 else
2448                         tiqn->logout_stats.abnormal_logouts++;
2449                 spin_unlock(&tiqn->logout_stats.lock);
2450         }
2451
2452         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2455                 hdr->cid, conn->cid);
2456
2457         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2458                 pr_err("Received logout request on connection that"
2459                         " is not in logged in state, ignoring request.\n");
2460                 iscsit_free_cmd(cmd, false);
2461                 return 0;
2462         }
2463
2464         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2465         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2466         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2467         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2468         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2469         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2470         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2471         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2472         cmd->logout_reason      = reason_code;
2473         cmd->data_direction     = DMA_NONE;
2474
2475         /*
2476          * We need to sleep in these cases (by returning 1) until the Logout
2477          * Response gets sent in the tx thread.
2478          */
2479         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2480            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2481             be16_to_cpu(hdr->cid) == conn->cid))
2482                 logout_remove = 1;
2483
2484         spin_lock_bh(&conn->cmd_lock);
2485         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2486         spin_unlock_bh(&conn->cmd_lock);
2487
2488         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2489                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2490
2491         /*
2492          * Immediate commands are executed, well, immediately.
2493          * Non-Immediate Logout Commands are executed in CmdSN order.
2494          */
2495         if (cmd->immediate_cmd) {
2496                 int ret = iscsit_execute_cmd(cmd, 0);
2497
2498                 if (ret < 0)
2499                         return ret;
2500         } else {
2501                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2502                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2503                         logout_remove = 0;
2504                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2505                         return -1;
2506         }
2507
2508         return logout_remove;
2509 }
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2511
2512 int iscsit_handle_snack(
2513         struct iscsi_conn *conn,
2514         unsigned char *buf)
2515 {
2516         struct iscsi_snack *hdr;
2517
2518         hdr                     = (struct iscsi_snack *) buf;
2519         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2520
2521         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2524                         hdr->begrun, hdr->runlength, conn->cid);
2525
2526         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2527                 pr_err("Initiator sent SNACK request while in"
2528                         " ErrorRecoveryLevel=0.\n");
2529                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2530                                          buf);
2531         }
2532         /*
2533          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2534          * call from inside iscsi_send_recovery_datain_or_r2t().
2535          */
2536         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2537         case 0:
2538                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2539                         hdr->itt,
2540                         be32_to_cpu(hdr->ttt),
2541                         be32_to_cpu(hdr->begrun),
2542                         be32_to_cpu(hdr->runlength));
2543         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2544                 return iscsit_handle_status_snack(conn, hdr->itt,
2545                         be32_to_cpu(hdr->ttt),
2546                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2547         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2548                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2549                         be32_to_cpu(hdr->begrun),
2550                         be32_to_cpu(hdr->runlength));
2551         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2552                 /* FIXME: Support R-Data SNACK */
2553                 pr_err("R-Data SNACK Not Supported.\n");
2554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2555                                          buf);
2556         default:
2557                 pr_err("Unknown SNACK type 0x%02x, protocol"
2558                         " error.\n", hdr->flags & 0x0f);
2559                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2560                                          buf);
2561         }
2562
2563         return 0;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_snack);
2566
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2568 {
2569         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2570             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2571                 wait_for_completion_interruptible_timeout(
2572                                         &conn->rx_half_close_comp,
2573                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2574         }
2575 }
2576
2577 static int iscsit_handle_immediate_data(
2578         struct iscsi_cmd *cmd,
2579         struct iscsi_scsi_req *hdr,
2580         u32 length)
2581 {
2582         int iov_ret, rx_got = 0, rx_size = 0;
2583         u32 checksum, iov_count = 0, padding = 0;
2584         struct iscsi_conn *conn = cmd->conn;
2585         struct kvec *iov;
2586
2587         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2588         if (iov_ret < 0)
2589                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2590
2591         rx_size = length;
2592         iov_count = iov_ret;
2593         iov = &cmd->iov_data[0];
2594
2595         padding = ((-length) & 3);
2596         if (padding != 0) {
2597                 iov[iov_count].iov_base = cmd->pad_bytes;
2598                 iov[iov_count++].iov_len = padding;
2599                 rx_size += padding;
2600         }
2601
2602         if (conn->conn_ops->DataDigest) {
2603                 iov[iov_count].iov_base         = &checksum;
2604                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2605                 rx_size += ISCSI_CRC_LEN;
2606         }
2607
2608         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2609
2610         iscsit_unmap_iovec(cmd);
2611
2612         if (rx_got != rx_size) {
2613                 iscsit_rx_thread_wait_for_tcp(conn);
2614                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2615         }
2616
2617         if (conn->conn_ops->DataDigest) {
2618                 u32 data_crc;
2619
2620                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2621                                                     cmd->write_data_done, length, padding,
2622                                                     cmd->pad_bytes);
2623
2624                 if (checksum != data_crc) {
2625                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626                                 " does not match computed 0x%08x\n", checksum,
2627                                 data_crc);
2628
2629                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2630                                 pr_err("Unable to recover from"
2631                                         " Immediate Data digest failure while"
2632                                         " in ERL=0.\n");
2633                                 iscsit_reject_cmd(cmd,
2634                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2635                                                 (unsigned char *)hdr);
2636                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637                         } else {
2638                                 iscsit_reject_cmd(cmd,
2639                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2640                                                 (unsigned char *)hdr);
2641                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2642                         }
2643                 } else {
2644                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2645                                 " %u bytes of Immediate Data\n", checksum,
2646                                 length);
2647                 }
2648         }
2649
2650         cmd->write_data_done += length;
2651
2652         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2653                 spin_lock_bh(&cmd->istate_lock);
2654                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2655                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2656                 spin_unlock_bh(&cmd->istate_lock);
2657         }
2658
2659         return IMMEDIATE_DATA_NORMAL_OPERATION;
2660 }
2661
2662 /*
2663  *      Called with sess->conn_lock held.
2664  */
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666         with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2668 {
2669         struct iscsi_cmd *cmd;
2670         struct iscsi_conn *conn_p;
2671         bool found = false;
2672
2673         /*
2674          * Only send a Asynchronous Message on connections whos network
2675          * interface is still functional.
2676          */
2677         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2678                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2679                         iscsit_inc_conn_usage_count(conn_p);
2680                         found = true;
2681                         break;
2682                 }
2683         }
2684
2685         if (!found)
2686                 return;
2687
2688         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2689         if (!cmd) {
2690                 iscsit_dec_conn_usage_count(conn_p);
2691                 return;
2692         }
2693
2694         cmd->logout_cid = conn->cid;
2695         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2696         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2697
2698         spin_lock_bh(&conn_p->cmd_lock);
2699         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2700         spin_unlock_bh(&conn_p->cmd_lock);
2701
2702         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2703         iscsit_dec_conn_usage_count(conn_p);
2704 }
2705
2706 static int iscsit_send_conn_drop_async_message(
2707         struct iscsi_cmd *cmd,
2708         struct iscsi_conn *conn)
2709 {
2710         struct iscsi_async *hdr;
2711
2712         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2713
2714         hdr                     = (struct iscsi_async *) cmd->pdu;
2715         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2716         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2717         cmd->init_task_tag      = RESERVED_ITT;
2718         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2719         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2720         cmd->stat_sn            = conn->stat_sn++;
2721         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2722         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2723         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2724         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2725         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2726         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2727         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2728
2729         pr_debug("Sending Connection Dropped Async Message StatSN:"
2730                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2731                         cmd->logout_cid, conn->cid);
2732
2733         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2734 }
2735
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2737 {
2738         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2739             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2740                 wait_for_completion_interruptible_timeout(
2741                                         &conn->tx_half_close_comp,
2742                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2743         }
2744 }
2745
2746 void
2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2749                         bool set_statsn)
2750 {
2751         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2752         hdr->flags              = datain->flags;
2753         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2754                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2755                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2756                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2757                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2758                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2759                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2760                 }
2761         }
2762         hton24(hdr->dlength, datain->length);
2763         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2764                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2765                                 (struct scsi_lun *)&hdr->lun);
2766         else
2767                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2768
2769         hdr->itt                = cmd->init_task_tag;
2770
2771         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2773         else
2774                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2775         if (set_statsn)
2776                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2777         else
2778                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2779
2780         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2781         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2782         hdr->datasn             = cpu_to_be32(datain->data_sn);
2783         hdr->offset             = cpu_to_be32(datain->offset);
2784
2785         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2788                 ntohl(hdr->offset), datain->length, conn->cid);
2789 }
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2791
2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2793 {
2794         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2795         struct iscsi_datain datain;
2796         struct iscsi_datain_req *dr;
2797         int eodr = 0, ret;
2798         bool set_statsn = false;
2799
2800         memset(&datain, 0, sizeof(struct iscsi_datain));
2801         dr = iscsit_get_datain_values(cmd, &datain);
2802         if (!dr) {
2803                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804                                 cmd->init_task_tag);
2805                 return -1;
2806         }
2807         /*
2808          * Be paranoid and double check the logic for now.
2809          */
2810         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2811                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812                         " datain.length: %u exceeds cmd->data_length: %u\n",
2813                         cmd->init_task_tag, datain.offset, datain.length,
2814                         cmd->se_cmd.data_length);
2815                 return -1;
2816         }
2817
2818         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2819         /*
2820          * Special case for successfully execution w/ both DATAIN
2821          * and Sense Data.
2822          */
2823         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2824             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2825                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2826         else {
2827                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2828                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2829                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2830                         cmd->stat_sn = conn->stat_sn++;
2831                         set_statsn = true;
2832                 } else if (dr->dr_complete ==
2833                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2834                         set_statsn = true;
2835         }
2836
2837         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2838
2839         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2840         if (ret < 0)
2841                 return ret;
2842
2843         if (dr->dr_complete) {
2844                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2845                                 2 : 1;
2846                 iscsit_free_datain_req(cmd, dr);
2847         }
2848
2849         return eodr;
2850 }
2851
2852 int
2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2854                         struct iscsi_logout_rsp *hdr)
2855 {
2856         struct iscsi_conn *logout_conn = NULL;
2857         struct iscsi_conn_recovery *cr = NULL;
2858         struct iscsi_session *sess = conn->sess;
2859         /*
2860          * The actual shutting down of Sessions and/or Connections
2861          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862          * is done in scsi_logout_post_handler().
2863          */
2864         switch (cmd->logout_reason) {
2865         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2866                 pr_debug("iSCSI session logout successful, setting"
2867                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2869                 break;
2870         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2871                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2872                         break;
2873                 /*
2874                  * For CLOSECONNECTION logout requests carrying
2875                  * a matching logout CID -> local CID, the reference
2876                  * for the local CID will have been incremented in
2877                  * iscsi_logout_closeconnection().
2878                  *
2879                  * For CLOSECONNECTION logout requests carrying
2880                  * a different CID than the connection it arrived
2881                  * on, the connection responding to cmd->logout_cid
2882                  * is stopped in iscsit_logout_post_handler_diffcid().
2883                  */
2884
2885                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886                         " successful.\n", cmd->logout_cid, conn->cid);
2887                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2888                 break;
2889         case ISCSI_LOGOUT_REASON_RECOVERY:
2890                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2891                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2892                         break;
2893                 /*
2894                  * If the connection is still active from our point of view
2895                  * force connection recovery to occur.
2896                  */
2897                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2898                                 cmd->logout_cid);
2899                 if (logout_conn) {
2900                         iscsit_connection_reinstatement_rcfr(logout_conn);
2901                         iscsit_dec_conn_usage_count(logout_conn);
2902                 }
2903
2904                 cr = iscsit_get_inactive_connection_recovery_entry(
2905                                 conn->sess, cmd->logout_cid);
2906                 if (!cr) {
2907                         pr_err("Unable to locate CID: %hu for"
2908                         " REMOVECONNFORRECOVERY Logout Request.\n",
2909                                 cmd->logout_cid);
2910                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2911                         break;
2912                 }
2913
2914                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2915
2916                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917                         " for recovery for CID: %hu on CID: %hu successful.\n",
2918                                 cmd->logout_cid, conn->cid);
2919                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2920                 break;
2921         default:
2922                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923                                 cmd->logout_reason);
2924                 return -1;
2925         }
2926
2927         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2928         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2929         hdr->response           = cmd->logout_response;
2930         hdr->itt                = cmd->init_task_tag;
2931         cmd->stat_sn            = conn->stat_sn++;
2932         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2933
2934         iscsit_increment_maxcmdsn(cmd, conn->sess);
2935         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2936         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2937
2938         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2941                 cmd->logout_cid, conn->cid);
2942
2943         return 0;
2944 }
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2946
2947 static int
2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2949 {
2950         int rc;
2951
2952         rc = iscsit_build_logout_rsp(cmd, conn,
2953                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2954         if (rc < 0)
2955                 return rc;
2956
2957         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2958 }
2959
2960 void
2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2962                        struct iscsi_nopin *hdr, bool nopout_response)
2963 {
2964         hdr->opcode             = ISCSI_OP_NOOP_IN;
2965         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2966         hton24(hdr->dlength, cmd->buf_ptr_size);
2967         if (nopout_response)
2968                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2969         hdr->itt                = cmd->init_task_tag;
2970         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2971         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2972                                   conn->stat_sn;
2973         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2974
2975         if (nopout_response)
2976                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2977
2978         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2979         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2980
2981         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2983                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2984                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2985 }
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2987
2988 /*
2989  *      Unsolicited NOPIN, either requesting a response or not.
2990  */
2991 static int iscsit_send_unsolicited_nopin(
2992         struct iscsi_cmd *cmd,
2993         struct iscsi_conn *conn,
2994         int want_response)
2995 {
2996         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2997         int ret;
2998
2999         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3000
3001         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3003
3004         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3005         if (ret < 0)
3006                 return ret;
3007
3008         spin_lock_bh(&cmd->istate_lock);
3009         cmd->i_state = want_response ?
3010                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3011         spin_unlock_bh(&cmd->istate_lock);
3012
3013         return 0;
3014 }
3015
3016 static int
3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3018 {
3019         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3020
3021         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3022
3023         /*
3024          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3026          */
3027         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3028
3029         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3030                                                      cmd->buf_ptr,
3031                                                      cmd->buf_ptr_size);
3032 }
3033
3034 static int iscsit_send_r2t(
3035         struct iscsi_cmd *cmd,
3036         struct iscsi_conn *conn)
3037 {
3038         struct iscsi_r2t *r2t;
3039         struct iscsi_r2t_rsp *hdr;
3040         int ret;
3041
3042         r2t = iscsit_get_r2t_from_list(cmd);
3043         if (!r2t)
3044                 return -1;
3045
3046         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3047         memset(hdr, 0, ISCSI_HDR_LEN);
3048         hdr->opcode             = ISCSI_OP_R2T;
3049         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3050         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3051                         (struct scsi_lun *)&hdr->lun);
3052         hdr->itt                = cmd->init_task_tag;
3053         if (conn->conn_transport->iscsit_get_r2t_ttt)
3054                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3055         else
3056                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3057         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3058         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3059         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3060         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3061         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3062         hdr->data_offset        = cpu_to_be32(r2t->offset);
3063         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3064
3065         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3068                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3069                         r2t->offset, r2t->xfer_len, conn->cid);
3070
3071         spin_lock_bh(&cmd->r2t_lock);
3072         r2t->sent_r2t = 1;
3073         spin_unlock_bh(&cmd->r2t_lock);
3074
3075         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3076         if (ret < 0) {
3077                 return ret;
3078         }
3079
3080         spin_lock_bh(&cmd->dataout_timeout_lock);
3081         iscsit_start_dataout_timer(cmd, conn);
3082         spin_unlock_bh(&cmd->dataout_timeout_lock);
3083
3084         return 0;
3085 }
3086
3087 /*
3088  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3089  *              connection recovery.
3090  */
3091 int iscsit_build_r2ts_for_cmd(
3092         struct iscsi_conn *conn,
3093         struct iscsi_cmd *cmd,
3094         bool recovery)
3095 {
3096         int first_r2t = 1;
3097         u32 offset = 0, xfer_len = 0;
3098
3099         spin_lock_bh(&cmd->r2t_lock);
3100         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101                 spin_unlock_bh(&cmd->r2t_lock);
3102                 return 0;
3103         }
3104
3105         if (conn->sess->sess_ops->DataSequenceInOrder &&
3106             !recovery)
3107                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3108
3109         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111                         offset = cmd->r2t_offset;
3112
3113                         if (first_r2t && recovery) {
3114                                 int new_data_end = offset +
3115                                         conn->sess->sess_ops->MaxBurstLength -
3116                                         cmd->next_burst_len;
3117
3118                                 if (new_data_end > cmd->se_cmd.data_length)
3119                                         xfer_len = cmd->se_cmd.data_length - offset;
3120                                 else
3121                                         xfer_len =
3122                                                 conn->sess->sess_ops->MaxBurstLength -
3123                                                 cmd->next_burst_len;
3124                         } else {
3125                                 int new_data_end = offset +
3126                                         conn->sess->sess_ops->MaxBurstLength;
3127
3128                                 if (new_data_end > cmd->se_cmd.data_length)
3129                                         xfer_len = cmd->se_cmd.data_length - offset;
3130                                 else
3131                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3132                         }
3133                         cmd->r2t_offset += xfer_len;
3134
3135                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137                 } else {
3138                         struct iscsi_seq *seq;
3139
3140                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3141                         if (!seq) {
3142                                 spin_unlock_bh(&cmd->r2t_lock);
3143                                 return -1;
3144                         }
3145
3146                         offset = seq->offset;
3147                         xfer_len = seq->xfer_len;
3148
3149                         if (cmd->seq_send_order == cmd->seq_count)
3150                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151                 }
3152                 cmd->outstanding_r2ts++;
3153                 first_r2t = 0;
3154
3155                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3156                         spin_unlock_bh(&cmd->r2t_lock);
3157                         return -1;
3158                 }
3159
3160                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3161                         break;
3162         }
3163         spin_unlock_bh(&cmd->r2t_lock);
3164
3165         return 0;
3166 }
3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3168
3169 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3170                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3171 {
3172         if (inc_stat_sn)
3173                 cmd->stat_sn = conn->stat_sn++;
3174
3175         atomic_long_inc(&conn->sess->rsp_pdus);
3176
3177         memset(hdr, 0, ISCSI_HDR_LEN);
3178         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3179         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3180         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3181                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3182                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3184                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3185                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3186         }
3187         hdr->response           = cmd->iscsi_response;
3188         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3189         hdr->itt                = cmd->init_task_tag;
3190         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3191
3192         iscsit_increment_maxcmdsn(cmd, conn->sess);
3193         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3194         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3195
3196         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3199                 cmd->se_cmd.scsi_status, conn->cid);
3200 }
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3202
3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3204 {
3205         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3206         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3207         void *data_buf = NULL;
3208         u32 padding = 0, data_buf_len = 0;
3209
3210         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3211
3212         /*
3213          * Attach SENSE DATA payload to iSCSI Response PDU
3214          */
3215         if (cmd->se_cmd.sense_buffer &&
3216            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3217             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3218                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3219                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3220
3221                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3222                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3223                 data_buf = cmd->sense_buffer;
3224                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3225
3226                 if (padding) {
3227                         memset(cmd->sense_buffer +
3228                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3229                         pr_debug("Adding %u bytes of padding to"
3230                                 " SENSE.\n", padding);
3231                 }
3232
3233                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3234                                 " Response PDU\n",
3235                                 cmd->se_cmd.scsi_sense_length);
3236         }
3237
3238         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3239                                                      data_buf_len);
3240 }
3241
3242 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3243 {
3244         switch (se_tmr->response) {
3245         case TMR_FUNCTION_COMPLETE:
3246                 return ISCSI_TMF_RSP_COMPLETE;
3247         case TMR_TASK_DOES_NOT_EXIST:
3248                 return ISCSI_TMF_RSP_NO_TASK;
3249         case TMR_LUN_DOES_NOT_EXIST:
3250                 return ISCSI_TMF_RSP_NO_LUN;
3251         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3252                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3253         case TMR_FUNCTION_REJECTED:
3254         default:
3255                 return ISCSI_TMF_RSP_REJECTED;
3256         }
3257 }
3258
3259 void
3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3261                           struct iscsi_tm_rsp *hdr)
3262 {
3263         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3264
3265         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3266         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3267         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3268         hdr->itt                = cmd->init_task_tag;
3269         cmd->stat_sn            = conn->stat_sn++;
3270         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3271
3272         iscsit_increment_maxcmdsn(cmd, conn->sess);
3273         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3274         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3275
3276         pr_debug("Built Task Management Response ITT: 0x%08x,"
3277                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3278                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3279 }
3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3281
3282 static int
3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3284 {
3285         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3286
3287         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3288
3289         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3290 }
3291
3292 #define SENDTARGETS_BUF_LIMIT 32768U
3293
3294 static int
3295 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3296                                   enum iscsit_transport_type network_transport,
3297                                   int skip_bytes, bool *completed)
3298 {
3299         char *payload = NULL;
3300         struct iscsi_conn *conn = cmd->conn;
3301         struct iscsi_portal_group *tpg;
3302         struct iscsi_tiqn *tiqn;
3303         struct iscsi_tpg_np *tpg_np;
3304         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3305         int target_name_printed;
3306         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3307         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3308         bool active;
3309
3310         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3311                          SENDTARGETS_BUF_LIMIT);
3312
3313         payload = kzalloc(buffer_len, GFP_KERNEL);
3314         if (!payload)
3315                 return -ENOMEM;
3316
3317         /*
3318          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3319          * explicit case..
3320          */
3321         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3322                 text_ptr = strchr(text_in, '=');
3323                 if (!text_ptr) {
3324                         pr_err("Unable to locate '=' string in text_in:"
3325                                " %s\n", text_in);
3326                         kfree(payload);
3327                         return -EINVAL;
3328                 }
3329                 /*
3330                  * Skip over '=' character..
3331                  */
3332                 text_ptr += 1;
3333         }
3334
3335         spin_lock(&tiqn_lock);
3336         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3337                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3338                      strcmp(tiqn->tiqn, text_ptr)) {
3339                         continue;
3340                 }
3341
3342                 target_name_printed = 0;
3343
3344                 spin_lock(&tiqn->tiqn_tpg_lock);
3345                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3346
3347                         /* If demo_mode_discovery=0 and generate_node_acls=0
3348                          * (demo mode dislabed) do not return
3349                          * TargetName+TargetAddress unless a NodeACL exists.
3350                          */
3351
3352                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3353                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3354                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3355                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3356                                 continue;
3357                         }
3358
3359                         spin_lock(&tpg->tpg_state_lock);
3360                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3361                         spin_unlock(&tpg->tpg_state_lock);
3362
3363                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3364                                 continue;
3365
3366                         spin_lock(&tpg->tpg_np_lock);
3367                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3368                                                 tpg_np_list) {
3369                                 struct iscsi_np *np = tpg_np->tpg_np;
3370                                 struct sockaddr_storage *sockaddr;
3371
3372                                 if (np->np_network_transport != network_transport)
3373                                         continue;
3374
3375                                 if (!target_name_printed) {
3376                                         len = sprintf(buf, "TargetName=%s",
3377                                                       tiqn->tiqn);
3378                                         len += 1;
3379
3380                                         if ((len + payload_len) > buffer_len) {
3381                                                 spin_unlock(&tpg->tpg_np_lock);
3382                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3383                                                 end_of_buf = 1;
3384                                                 goto eob;
3385                                         }
3386
3387                                         if (skip_bytes && len <= skip_bytes) {
3388                                                 skip_bytes -= len;
3389                                         } else {
3390                                                 memcpy(payload + payload_len, buf, len);
3391                                                 payload_len += len;
3392                                                 target_name_printed = 1;
3393                                                 if (len > skip_bytes)
3394                                                         skip_bytes = 0;
3395                                         }
3396                                 }
3397
3398                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3399                                         sockaddr = &conn->local_sockaddr;
3400                                 else
3401                                         sockaddr = &np->np_sockaddr;
3402
3403                                 len = sprintf(buf, "TargetAddress="
3404                                               "%pISpc,%hu",
3405                                               sockaddr,
3406                                               tpg->tpgt);
3407                                 len += 1;
3408
3409                                 if ((len + payload_len) > buffer_len) {
3410                                         spin_unlock(&tpg->tpg_np_lock);
3411                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3412                                         end_of_buf = 1;
3413                                         goto eob;
3414                                 }
3415
3416                                 if (skip_bytes && len <= skip_bytes) {
3417                                         skip_bytes -= len;
3418                                 } else {
3419                                         memcpy(payload + payload_len, buf, len);
3420                                         payload_len += len;
3421                                         if (len > skip_bytes)
3422                                                 skip_bytes = 0;
3423                                 }
3424                         }
3425                         spin_unlock(&tpg->tpg_np_lock);
3426                 }
3427                 spin_unlock(&tiqn->tiqn_tpg_lock);
3428 eob:
3429                 if (end_of_buf) {
3430                         *completed = false;
3431                         break;
3432                 }
3433
3434                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3435                         break;
3436         }
3437         spin_unlock(&tiqn_lock);
3438
3439         cmd->buf_ptr = payload;
3440
3441         return payload_len;
3442 }
3443
3444 int
3445 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3446                       struct iscsi_text_rsp *hdr,
3447                       enum iscsit_transport_type network_transport)
3448 {
3449         int text_length, padding;
3450         bool completed = true;
3451
3452         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3453                                                         cmd->read_data_done,
3454                                                         &completed);
3455         if (text_length < 0)
3456                 return text_length;
3457
3458         if (completed) {
3459                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3460         } else {
3461                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3462                 cmd->read_data_done += text_length;
3463                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3464                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3465         }
3466         hdr->opcode = ISCSI_OP_TEXT_RSP;
3467         padding = ((-text_length) & 3);
3468         hton24(hdr->dlength, text_length);
3469         hdr->itt = cmd->init_task_tag;
3470         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3471         cmd->stat_sn = conn->stat_sn++;
3472         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3473
3474         iscsit_increment_maxcmdsn(cmd, conn->sess);
3475         /*
3476          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3477          * correctly increment MaxCmdSN for each response answering a
3478          * non immediate text request with a valid CmdSN.
3479          */
3480         cmd->maxcmdsn_inc = 0;
3481         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3482         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3483
3484         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3485                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3486                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3487                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3488                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3489
3490         return text_length + padding;
3491 }
3492 EXPORT_SYMBOL(iscsit_build_text_rsp);
3493
3494 static int iscsit_send_text_rsp(
3495         struct iscsi_cmd *cmd,
3496         struct iscsi_conn *conn)
3497 {
3498         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3499         int text_length;
3500
3501         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3502                                 conn->conn_transport->transport_type);
3503         if (text_length < 0)
3504                 return text_length;
3505
3506         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3507                                                      cmd->buf_ptr,
3508                                                      text_length);
3509 }
3510
3511 void
3512 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3513                     struct iscsi_reject *hdr)
3514 {
3515         hdr->opcode             = ISCSI_OP_REJECT;
3516         hdr->reason             = cmd->reject_reason;
3517         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3518         hton24(hdr->dlength, ISCSI_HDR_LEN);
3519         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3520         cmd->stat_sn            = conn->stat_sn++;
3521         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3522         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3523         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3524
3525 }
3526 EXPORT_SYMBOL(iscsit_build_reject);
3527
3528 static int iscsit_send_reject(
3529         struct iscsi_cmd *cmd,
3530         struct iscsi_conn *conn)
3531 {
3532         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3533
3534         iscsit_build_reject(cmd, conn, hdr);
3535
3536         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3537                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3538
3539         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3540                                                      cmd->buf_ptr,
3541                                                      ISCSI_HDR_LEN);
3542 }
3543
3544 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3545 {
3546         int ord, cpu;
3547         /*
3548          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3549          * within iscsit_start_kthreads()
3550          *
3551          * Here we use bitmap_id to determine which CPU that this
3552          * iSCSI connection's RX/TX threads will be scheduled to
3553          * execute upon.
3554          */
3555         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3556         for_each_online_cpu(cpu) {
3557                 if (ord-- == 0) {
3558                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3559                         return;
3560                 }
3561         }
3562         /*
3563          * This should never be reached..
3564          */
3565         dump_stack();
3566         cpumask_setall(conn->conn_cpumask);
3567 }
3568
3569 int
3570 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3571 {
3572         int ret;
3573
3574         switch (state) {
3575         case ISTATE_SEND_R2T:
3576                 ret = iscsit_send_r2t(cmd, conn);
3577                 if (ret < 0)
3578                         goto err;
3579                 break;
3580         case ISTATE_REMOVE:
3581                 spin_lock_bh(&conn->cmd_lock);
3582                 list_del_init(&cmd->i_conn_node);
3583                 spin_unlock_bh(&conn->cmd_lock);
3584
3585                 iscsit_free_cmd(cmd, false);
3586                 break;
3587         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3588                 iscsit_mod_nopin_response_timer(conn);
3589                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3590                 if (ret < 0)
3591                         goto err;
3592                 break;
3593         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3594                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3595                 if (ret < 0)
3596                         goto err;
3597                 break;
3598         default:
3599                 pr_err("Unknown Opcode: 0x%02x ITT:"
3600                        " 0x%08x, i_state: %d on CID: %hu\n",
3601                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3602                        conn->cid);
3603                 goto err;
3604         }
3605
3606         return 0;
3607
3608 err:
3609         return -1;
3610 }
3611 EXPORT_SYMBOL(iscsit_immediate_queue);
3612
3613 static int
3614 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3615 {
3616         struct iscsit_transport *t = conn->conn_transport;
3617         struct iscsi_queue_req *qr;
3618         struct iscsi_cmd *cmd;
3619         u8 state;
3620         int ret;
3621
3622         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3623                 atomic_set(&conn->check_immediate_queue, 0);
3624                 cmd = qr->cmd;
3625                 state = qr->state;
3626                 kmem_cache_free(lio_qr_cache, qr);
3627
3628                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3629                 if (ret < 0)
3630                         return ret;
3631         }
3632
3633         return 0;
3634 }
3635
3636 int
3637 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3638 {
3639         int ret;
3640
3641 check_rsp_state:
3642         switch (state) {
3643         case ISTATE_SEND_DATAIN:
3644                 ret = iscsit_send_datain(cmd, conn);
3645                 if (ret < 0)
3646                         goto err;
3647                 else if (!ret)
3648                         /* more drs */
3649                         goto check_rsp_state;
3650                 else if (ret == 1) {
3651                         /* all done */
3652                         spin_lock_bh(&cmd->istate_lock);
3653                         cmd->i_state = ISTATE_SENT_STATUS;
3654                         spin_unlock_bh(&cmd->istate_lock);
3655
3656                         if (atomic_read(&conn->check_immediate_queue))
3657                                 return 1;
3658
3659                         return 0;
3660                 } else if (ret == 2) {
3661                         /* Still must send status,
3662                            SCF_TRANSPORT_TASK_SENSE was set */
3663                         spin_lock_bh(&cmd->istate_lock);
3664                         cmd->i_state = ISTATE_SEND_STATUS;
3665                         spin_unlock_bh(&cmd->istate_lock);
3666                         state = ISTATE_SEND_STATUS;
3667                         goto check_rsp_state;
3668                 }
3669
3670                 break;
3671         case ISTATE_SEND_STATUS:
3672         case ISTATE_SEND_STATUS_RECOVERY:
3673                 ret = iscsit_send_response(cmd, conn);
3674                 break;
3675         case ISTATE_SEND_LOGOUTRSP:
3676                 ret = iscsit_send_logout(cmd, conn);
3677                 break;
3678         case ISTATE_SEND_ASYNCMSG:
3679                 ret = iscsit_send_conn_drop_async_message(
3680                         cmd, conn);
3681                 break;
3682         case ISTATE_SEND_NOPIN:
3683                 ret = iscsit_send_nopin(cmd, conn);
3684                 break;
3685         case ISTATE_SEND_REJECT:
3686                 ret = iscsit_send_reject(cmd, conn);
3687                 break;
3688         case ISTATE_SEND_TASKMGTRSP:
3689                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3690                 if (ret != 0)
3691                         break;
3692                 ret = iscsit_tmr_post_handler(cmd, conn);
3693                 if (ret != 0)
3694                         iscsit_fall_back_to_erl0(conn->sess);
3695                 break;
3696         case ISTATE_SEND_TEXTRSP:
3697                 ret = iscsit_send_text_rsp(cmd, conn);
3698                 break;
3699         default:
3700                 pr_err("Unknown Opcode: 0x%02x ITT:"
3701                        " 0x%08x, i_state: %d on CID: %hu\n",
3702                        cmd->iscsi_opcode, cmd->init_task_tag,
3703                        state, conn->cid);
3704                 goto err;
3705         }
3706         if (ret < 0)
3707                 goto err;
3708
3709         switch (state) {
3710         case ISTATE_SEND_LOGOUTRSP:
3711                 if (!iscsit_logout_post_handler(cmd, conn))
3712                         return -ECONNRESET;
3713                 /* fall through */
3714         case ISTATE_SEND_STATUS:
3715         case ISTATE_SEND_ASYNCMSG:
3716         case ISTATE_SEND_NOPIN:
3717         case ISTATE_SEND_STATUS_RECOVERY:
3718         case ISTATE_SEND_TEXTRSP:
3719         case ISTATE_SEND_TASKMGTRSP:
3720         case ISTATE_SEND_REJECT:
3721                 spin_lock_bh(&cmd->istate_lock);
3722                 cmd->i_state = ISTATE_SENT_STATUS;
3723                 spin_unlock_bh(&cmd->istate_lock);
3724                 break;
3725         default:
3726                 pr_err("Unknown Opcode: 0x%02x ITT:"
3727                        " 0x%08x, i_state: %d on CID: %hu\n",
3728                        cmd->iscsi_opcode, cmd->init_task_tag,
3729                        cmd->i_state, conn->cid);
3730                 goto err;
3731         }
3732
3733         if (atomic_read(&conn->check_immediate_queue))
3734                 return 1;
3735
3736         return 0;
3737
3738 err:
3739         return -1;
3740 }
3741 EXPORT_SYMBOL(iscsit_response_queue);
3742
3743 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3744 {
3745         struct iscsit_transport *t = conn->conn_transport;
3746         struct iscsi_queue_req *qr;
3747         struct iscsi_cmd *cmd;
3748         u8 state;
3749         int ret;
3750
3751         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3752                 cmd = qr->cmd;
3753                 state = qr->state;
3754                 kmem_cache_free(lio_qr_cache, qr);
3755
3756                 ret = t->iscsit_response_queue(conn, cmd, state);
3757                 if (ret == 1 || ret < 0)
3758                         return ret;
3759         }
3760
3761         return 0;
3762 }
3763
3764 int iscsi_target_tx_thread(void *arg)
3765 {
3766         int ret = 0;
3767         struct iscsi_conn *conn = arg;
3768         bool conn_freed = false;
3769
3770         /*
3771          * Allow ourselves to be interrupted by SIGINT so that a
3772          * connection recovery / failure event can be triggered externally.
3773          */
3774         allow_signal(SIGINT);
3775
3776         while (!kthread_should_stop()) {
3777                 /*
3778                  * Ensure that both TX and RX per connection kthreads
3779                  * are scheduled to run on the same CPU.
3780                  */
3781                 iscsit_thread_check_cpumask(conn, current, 1);
3782
3783                 wait_event_interruptible(conn->queues_wq,
3784                                          !iscsit_conn_all_queues_empty(conn));
3785
3786                 if (signal_pending(current))
3787                         goto transport_err;
3788
3789 get_immediate:
3790                 ret = iscsit_handle_immediate_queue(conn);
3791                 if (ret < 0)
3792                         goto transport_err;
3793
3794                 ret = iscsit_handle_response_queue(conn);
3795                 if (ret == 1) {
3796                         goto get_immediate;
3797                 } else if (ret == -ECONNRESET) {
3798                         conn_freed = true;
3799                         goto out;
3800                 } else if (ret < 0) {
3801                         goto transport_err;
3802                 }
3803         }
3804
3805 transport_err:
3806         /*
3807          * Avoid the normal connection failure code-path if this connection
3808          * is still within LOGIN mode, and iscsi_np process context is
3809          * responsible for cleaning up the early connection failure.
3810          */
3811         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3812                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3813 out:
3814         if (!conn_freed) {
3815                 while (!kthread_should_stop()) {
3816                         msleep(100);
3817                 }
3818         }
3819         return 0;
3820 }
3821
3822 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3823 {
3824         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3825         struct iscsi_cmd *cmd;
3826         int ret = 0;
3827
3828         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3829         case ISCSI_OP_SCSI_CMD:
3830                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3831                 if (!cmd)
3832                         goto reject;
3833
3834                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3835                 break;
3836         case ISCSI_OP_SCSI_DATA_OUT:
3837                 ret = iscsit_handle_data_out(conn, buf);
3838                 break;
3839         case ISCSI_OP_NOOP_OUT:
3840                 cmd = NULL;
3841                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3842                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3843                         if (!cmd)
3844                                 goto reject;
3845                 }
3846                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3847                 break;
3848         case ISCSI_OP_SCSI_TMFUNC:
3849                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3850                 if (!cmd)
3851                         goto reject;
3852
3853                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3854                 break;
3855         case ISCSI_OP_TEXT:
3856                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3857                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3858                         if (!cmd)
3859                                 goto reject;
3860                 } else {
3861                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862                         if (!cmd)
3863                                 goto reject;
3864                 }
3865
3866                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3867                 break;
3868         case ISCSI_OP_LOGOUT:
3869                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870                 if (!cmd)
3871                         goto reject;
3872
3873                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3874                 if (ret > 0)
3875                         wait_for_completion_timeout(&conn->conn_logout_comp,
3876                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3877                 break;
3878         case ISCSI_OP_SNACK:
3879                 ret = iscsit_handle_snack(conn, buf);
3880                 break;
3881         default:
3882                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3883                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3884                         pr_err("Cannot recover from unknown"
3885                         " opcode while ERL=0, closing iSCSI connection.\n");
3886                         return -1;
3887                 }
3888                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3889                        " closing iSCSI connection.\n");
3890                 ret = -1;
3891                 break;
3892         }
3893
3894         return ret;
3895 reject:
3896         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3897 }
3898
3899 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3900 {
3901         bool ret;
3902
3903         spin_lock_bh(&conn->state_lock);
3904         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3905         spin_unlock_bh(&conn->state_lock);
3906
3907         return ret;
3908 }
3909
3910 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3911 {
3912         int ret;
3913         u8 buffer[ISCSI_HDR_LEN], opcode;
3914         u32 checksum = 0, digest = 0;
3915         struct kvec iov;
3916
3917         while (!kthread_should_stop()) {
3918                 /*
3919                  * Ensure that both TX and RX per connection kthreads
3920                  * are scheduled to run on the same CPU.
3921                  */
3922                 iscsit_thread_check_cpumask(conn, current, 0);
3923
3924                 memset(buffer, 0, ISCSI_HDR_LEN);
3925                 memset(&iov, 0, sizeof(struct kvec));
3926
3927                 iov.iov_base    = buffer;
3928                 iov.iov_len     = ISCSI_HDR_LEN;
3929
3930                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3931                 if (ret != ISCSI_HDR_LEN) {
3932                         iscsit_rx_thread_wait_for_tcp(conn);
3933                         return;
3934                 }
3935
3936                 if (conn->conn_ops->HeaderDigest) {
3937                         iov.iov_base    = &digest;
3938                         iov.iov_len     = ISCSI_CRC_LEN;
3939
3940                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3941                         if (ret != ISCSI_CRC_LEN) {
3942                                 iscsit_rx_thread_wait_for_tcp(conn);
3943                                 return;
3944                         }
3945
3946                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3947                                                   ISCSI_HDR_LEN, 0, NULL,
3948                                                   &checksum);
3949
3950                         if (digest != checksum) {
3951                                 pr_err("HeaderDigest CRC32C failed,"
3952                                         " received 0x%08x, computed 0x%08x\n",
3953                                         digest, checksum);
3954                                 /*
3955                                  * Set the PDU to 0xff so it will intentionally
3956                                  * hit default in the switch below.
3957                                  */
3958                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3959                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3960                         } else {
3961                                 pr_debug("Got HeaderDigest CRC32C"
3962                                                 " 0x%08x\n", checksum);
3963                         }
3964                 }
3965
3966                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3967                         return;
3968
3969                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3970
3971                 if (conn->sess->sess_ops->SessionType &&
3972                    ((!(opcode & ISCSI_OP_TEXT)) ||
3973                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3974                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3975                         " while in Discovery Session, rejecting.\n", opcode);
3976                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3977                                           buffer);
3978                         return;
3979                 }
3980
3981                 ret = iscsi_target_rx_opcode(conn, buffer);
3982                 if (ret < 0)
3983                         return;
3984         }
3985 }
3986
3987 int iscsi_target_rx_thread(void *arg)
3988 {
3989         int rc;
3990         struct iscsi_conn *conn = arg;
3991         bool conn_freed = false;
3992
3993         /*
3994          * Allow ourselves to be interrupted by SIGINT so that a
3995          * connection recovery / failure event can be triggered externally.
3996          */
3997         allow_signal(SIGINT);
3998         /*
3999          * Wait for iscsi_post_login_handler() to complete before allowing
4000          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4001          */
4002         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4003         if (rc < 0 || iscsi_target_check_conn_state(conn))
4004                 goto out;
4005
4006         if (!conn->conn_transport->iscsit_get_rx_pdu)
4007                 return 0;
4008
4009         conn->conn_transport->iscsit_get_rx_pdu(conn);
4010
4011         if (!signal_pending(current))
4012                 atomic_set(&conn->transport_failed, 1);
4013         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4014
4015 out:
4016         if (!conn_freed) {
4017                 while (!kthread_should_stop()) {
4018                         msleep(100);
4019                 }
4020         }
4021
4022         return 0;
4023 }
4024
4025 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4026 {
4027         LIST_HEAD(tmp_list);
4028         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4029         struct iscsi_session *sess = conn->sess;
4030         /*
4031          * We expect this function to only ever be called from either RX or TX
4032          * thread context via iscsit_close_connection() once the other context
4033          * has been reset -> returned sleeping pre-handler state.
4034          */
4035         spin_lock_bh(&conn->cmd_lock);
4036         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4037
4038         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4039                 struct se_cmd *se_cmd = &cmd->se_cmd;
4040
4041                 if (se_cmd->se_tfo != NULL) {
4042                         spin_lock(&se_cmd->t_state_lock);
4043                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4044                         spin_unlock(&se_cmd->t_state_lock);
4045                 }
4046         }
4047         spin_unlock_bh(&conn->cmd_lock);
4048
4049         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4050                 list_del_init(&cmd->i_conn_node);
4051
4052                 iscsit_increment_maxcmdsn(cmd, sess);
4053                 iscsit_free_cmd(cmd, true);
4054
4055         }
4056 }
4057
4058 static void iscsit_stop_timers_for_cmds(
4059         struct iscsi_conn *conn)
4060 {
4061         struct iscsi_cmd *cmd;
4062
4063         spin_lock_bh(&conn->cmd_lock);
4064         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4065                 if (cmd->data_direction == DMA_TO_DEVICE)
4066                         iscsit_stop_dataout_timer(cmd);
4067         }
4068         spin_unlock_bh(&conn->cmd_lock);
4069 }
4070
4071 int iscsit_close_connection(
4072         struct iscsi_conn *conn)
4073 {
4074         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4075         struct iscsi_session    *sess = conn->sess;
4076
4077         pr_debug("Closing iSCSI connection CID %hu on SID:"
4078                 " %u\n", conn->cid, sess->sid);
4079         /*
4080          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4081          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4082          * sleeping and the logout response never got sent because the
4083          * connection failed.
4084          *
4085          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4086          * to signal logout response TX interrupt completion.  Go ahead and skip
4087          * this for iser since isert_rx_opcode() does not wait on logout failure,
4088          * and to avoid iscsi_conn pointer dereference in iser-target code.
4089          */
4090         if (!conn->conn_transport->rdma_shutdown)
4091                 complete(&conn->conn_logout_comp);
4092
4093         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4094                 if (conn->tx_thread &&
4095                     cmpxchg(&conn->tx_thread_active, true, false)) {
4096                         send_sig(SIGINT, conn->tx_thread, 1);
4097                         kthread_stop(conn->tx_thread);
4098                 }
4099         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4100                 if (conn->rx_thread &&
4101                     cmpxchg(&conn->rx_thread_active, true, false)) {
4102                         send_sig(SIGINT, conn->rx_thread, 1);
4103                         kthread_stop(conn->rx_thread);
4104                 }
4105         }
4106
4107         spin_lock(&iscsit_global->ts_bitmap_lock);
4108         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4109                               get_order(1));
4110         spin_unlock(&iscsit_global->ts_bitmap_lock);
4111
4112         iscsit_stop_timers_for_cmds(conn);
4113         iscsit_stop_nopin_response_timer(conn);
4114         iscsit_stop_nopin_timer(conn);
4115
4116         if (conn->conn_transport->iscsit_wait_conn)
4117                 conn->conn_transport->iscsit_wait_conn(conn);
4118
4119         /*
4120          * During Connection recovery drop unacknowledged out of order
4121          * commands for this connection, and prepare the other commands
4122          * for reallegiance.
4123          *
4124          * During normal operation clear the out of order commands (but
4125          * do not free the struct iscsi_ooo_cmdsn's) and release all
4126          * struct iscsi_cmds.
4127          */
4128         if (atomic_read(&conn->connection_recovery)) {
4129                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4130                 iscsit_prepare_cmds_for_reallegiance(conn);
4131         } else {
4132                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4133                 iscsit_release_commands_from_conn(conn);
4134         }
4135         iscsit_free_queue_reqs_for_conn(conn);
4136
4137         /*
4138          * Handle decrementing session or connection usage count if
4139          * a logout response was not able to be sent because the
4140          * connection failed.  Fall back to Session Recovery here.
4141          */
4142         if (atomic_read(&conn->conn_logout_remove)) {
4143                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4144                         iscsit_dec_conn_usage_count(conn);
4145                         iscsit_dec_session_usage_count(sess);
4146                 }
4147                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4148                         iscsit_dec_conn_usage_count(conn);
4149
4150                 atomic_set(&conn->conn_logout_remove, 0);
4151                 atomic_set(&sess->session_reinstatement, 0);
4152                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4153         }
4154
4155         spin_lock_bh(&sess->conn_lock);
4156         list_del(&conn->conn_list);
4157
4158         /*
4159          * Attempt to let the Initiator know this connection failed by
4160          * sending an Connection Dropped Async Message on another
4161          * active connection.
4162          */
4163         if (atomic_read(&conn->connection_recovery))
4164                 iscsit_build_conn_drop_async_message(conn);
4165
4166         spin_unlock_bh(&sess->conn_lock);
4167
4168         /*
4169          * If connection reinstatement is being performed on this connection,
4170          * up the connection reinstatement semaphore that is being blocked on
4171          * in iscsit_cause_connection_reinstatement().
4172          */
4173         spin_lock_bh(&conn->state_lock);
4174         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4175                 spin_unlock_bh(&conn->state_lock);
4176                 complete(&conn->conn_wait_comp);
4177                 wait_for_completion(&conn->conn_post_wait_comp);
4178                 spin_lock_bh(&conn->state_lock);
4179         }
4180
4181         /*
4182          * If connection reinstatement is being performed on this connection
4183          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4184          * connection wait rcfr semaphore that is being blocked on
4185          * an iscsit_connection_reinstatement_rcfr().
4186          */
4187         if (atomic_read(&conn->connection_wait_rcfr)) {
4188                 spin_unlock_bh(&conn->state_lock);
4189                 complete(&conn->conn_wait_rcfr_comp);
4190                 wait_for_completion(&conn->conn_post_wait_comp);
4191                 spin_lock_bh(&conn->state_lock);
4192         }
4193         atomic_set(&conn->connection_reinstatement, 1);
4194         spin_unlock_bh(&conn->state_lock);
4195
4196         /*
4197          * If any other processes are accessing this connection pointer we
4198          * must wait until they have completed.
4199          */
4200         iscsit_check_conn_usage_count(conn);
4201
4202         ahash_request_free(conn->conn_tx_hash);
4203         if (conn->conn_rx_hash) {
4204                 struct crypto_ahash *tfm;
4205
4206                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4207                 ahash_request_free(conn->conn_rx_hash);
4208                 crypto_free_ahash(tfm);
4209         }
4210
4211         free_cpumask_var(conn->conn_cpumask);
4212
4213         kfree(conn->conn_ops);
4214         conn->conn_ops = NULL;
4215
4216         if (conn->sock)
4217                 sock_release(conn->sock);
4218
4219         if (conn->conn_transport->iscsit_free_conn)
4220                 conn->conn_transport->iscsit_free_conn(conn);
4221
4222         iscsit_put_transport(conn->conn_transport);
4223
4224         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4225         conn->conn_state = TARG_CONN_STATE_FREE;
4226         kfree(conn);
4227
4228         spin_lock_bh(&sess->conn_lock);
4229         atomic_dec(&sess->nconn);
4230         pr_debug("Decremented iSCSI connection count to %hu from node:"
4231                 " %s\n", atomic_read(&sess->nconn),
4232                 sess->sess_ops->InitiatorName);
4233         /*
4234          * Make sure that if one connection fails in an non ERL=2 iSCSI
4235          * Session that they all fail.
4236          */
4237         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4238              !atomic_read(&sess->session_logout))
4239                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4240
4241         /*
4242          * If this was not the last connection in the session, and we are
4243          * performing session reinstatement or falling back to ERL=0, call
4244          * iscsit_stop_session() without sleeping to shutdown the other
4245          * active connections.
4246          */
4247         if (atomic_read(&sess->nconn)) {
4248                 if (!atomic_read(&sess->session_reinstatement) &&
4249                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4250                         spin_unlock_bh(&sess->conn_lock);
4251                         return 0;
4252                 }
4253                 if (!atomic_read(&sess->session_stop_active)) {
4254                         atomic_set(&sess->session_stop_active, 1);
4255                         spin_unlock_bh(&sess->conn_lock);
4256                         iscsit_stop_session(sess, 0, 0);
4257                         return 0;
4258                 }
4259                 spin_unlock_bh(&sess->conn_lock);
4260                 return 0;
4261         }
4262
4263         /*
4264          * If this was the last connection in the session and one of the
4265          * following is occurring:
4266          *
4267          * Session Reinstatement is not being performed, and are falling back
4268          * to ERL=0 call iscsit_close_session().
4269          *
4270          * Session Logout was requested.  iscsit_close_session() will be called
4271          * elsewhere.
4272          *
4273          * Session Continuation is not being performed, start the Time2Retain
4274          * handler and check if sleep_on_sess_wait_sem is active.
4275          */
4276         if (!atomic_read(&sess->session_reinstatement) &&
4277              atomic_read(&sess->session_fall_back_to_erl0)) {
4278                 spin_unlock_bh(&sess->conn_lock);
4279                 iscsit_close_session(sess);
4280
4281                 return 0;
4282         } else if (atomic_read(&sess->session_logout)) {
4283                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4284                 sess->session_state = TARG_SESS_STATE_FREE;
4285                 spin_unlock_bh(&sess->conn_lock);
4286
4287                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4288                         complete(&sess->session_wait_comp);
4289
4290                 return 0;
4291         } else {
4292                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4293                 sess->session_state = TARG_SESS_STATE_FAILED;
4294
4295                 if (!atomic_read(&sess->session_continuation)) {
4296                         spin_unlock_bh(&sess->conn_lock);
4297                         iscsit_start_time2retain_handler(sess);
4298                 } else
4299                         spin_unlock_bh(&sess->conn_lock);
4300
4301                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4302                         complete(&sess->session_wait_comp);
4303
4304                 return 0;
4305         }
4306 }
4307
4308 /*
4309  * If the iSCSI Session for the iSCSI Initiator Node exists,
4310  * forcefully shutdown the iSCSI NEXUS.
4311  */
4312 int iscsit_close_session(struct iscsi_session *sess)
4313 {
4314         struct iscsi_portal_group *tpg = sess->tpg;
4315         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4316
4317         if (atomic_read(&sess->nconn)) {
4318                 pr_err("%d connection(s) still exist for iSCSI session"
4319                         " to %s\n", atomic_read(&sess->nconn),
4320                         sess->sess_ops->InitiatorName);
4321                 BUG();
4322         }
4323
4324         spin_lock_bh(&se_tpg->session_lock);
4325         atomic_set(&sess->session_logout, 1);
4326         atomic_set(&sess->session_reinstatement, 1);
4327         iscsit_stop_time2retain_timer(sess);
4328         spin_unlock_bh(&se_tpg->session_lock);
4329
4330         /*
4331          * transport_deregister_session_configfs() will clear the
4332          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4333          * can be setting it again with __transport_register_session() in
4334          * iscsi_post_login_handler() again after the iscsit_stop_session()
4335          * completes in iscsi_np context.
4336          */
4337         transport_deregister_session_configfs(sess->se_sess);
4338
4339         /*
4340          * If any other processes are accessing this session pointer we must
4341          * wait until they have completed.  If we are in an interrupt (the
4342          * time2retain handler) and contain and active session usage count we
4343          * restart the timer and exit.
4344          */
4345         if (!in_interrupt()) {
4346                 if (iscsit_check_session_usage_count(sess) == 1)
4347                         iscsit_stop_session(sess, 1, 1);
4348         } else {
4349                 if (iscsit_check_session_usage_count(sess) == 2) {
4350                         atomic_set(&sess->session_logout, 0);
4351                         iscsit_start_time2retain_handler(sess);
4352                         return 0;
4353                 }
4354         }
4355
4356         transport_deregister_session(sess->se_sess);
4357
4358         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4359                 iscsit_free_connection_recovery_entires(sess);
4360
4361         iscsit_free_all_ooo_cmdsns(sess);
4362
4363         spin_lock_bh(&se_tpg->session_lock);
4364         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4365         sess->session_state = TARG_SESS_STATE_FREE;
4366         pr_debug("Released iSCSI session from node: %s\n",
4367                         sess->sess_ops->InitiatorName);
4368         tpg->nsessions--;
4369         if (tpg->tpg_tiqn)
4370                 tpg->tpg_tiqn->tiqn_nsessions--;
4371
4372         pr_debug("Decremented number of active iSCSI Sessions on"
4373                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4374
4375         ida_free(&sess_ida, sess->session_index);
4376         kfree(sess->sess_ops);
4377         sess->sess_ops = NULL;
4378         spin_unlock_bh(&se_tpg->session_lock);
4379
4380         kfree(sess);
4381         return 0;
4382 }
4383
4384 static void iscsit_logout_post_handler_closesession(
4385         struct iscsi_conn *conn)
4386 {
4387         struct iscsi_session *sess = conn->sess;
4388         int sleep = 1;
4389         /*
4390          * Traditional iscsi/tcp will invoke this logic from TX thread
4391          * context during session logout, so clear tx_thread_active and
4392          * sleep if iscsit_close_connection() has not already occured.
4393          *
4394          * Since iser-target invokes this logic from it's own workqueue,
4395          * always sleep waiting for RX/TX thread shutdown to complete
4396          * within iscsit_close_connection().
4397          */
4398         if (!conn->conn_transport->rdma_shutdown) {
4399                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4400                 if (!sleep)
4401                         return;
4402         }
4403
4404         atomic_set(&conn->conn_logout_remove, 0);
4405         complete(&conn->conn_logout_comp);
4406
4407         iscsit_dec_conn_usage_count(conn);
4408         iscsit_stop_session(sess, sleep, sleep);
4409         iscsit_dec_session_usage_count(sess);
4410         iscsit_close_session(sess);
4411 }
4412
4413 static void iscsit_logout_post_handler_samecid(
4414         struct iscsi_conn *conn)
4415 {
4416         int sleep = 1;
4417
4418         if (!conn->conn_transport->rdma_shutdown) {
4419                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4420                 if (!sleep)
4421                         return;
4422         }
4423
4424         atomic_set(&conn->conn_logout_remove, 0);
4425         complete(&conn->conn_logout_comp);
4426
4427         iscsit_cause_connection_reinstatement(conn, sleep);
4428         iscsit_dec_conn_usage_count(conn);
4429 }
4430
4431 static void iscsit_logout_post_handler_diffcid(
4432         struct iscsi_conn *conn,
4433         u16 cid)
4434 {
4435         struct iscsi_conn *l_conn;
4436         struct iscsi_session *sess = conn->sess;
4437         bool conn_found = false;
4438
4439         if (!sess)
4440                 return;
4441
4442         spin_lock_bh(&sess->conn_lock);
4443         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4444                 if (l_conn->cid == cid) {
4445                         iscsit_inc_conn_usage_count(l_conn);
4446                         conn_found = true;
4447                         break;
4448                 }
4449         }
4450         spin_unlock_bh(&sess->conn_lock);
4451
4452         if (!conn_found)
4453                 return;
4454
4455         if (l_conn->sock)
4456                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4457
4458         spin_lock_bh(&l_conn->state_lock);
4459         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4460         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4461         spin_unlock_bh(&l_conn->state_lock);
4462
4463         iscsit_cause_connection_reinstatement(l_conn, 1);
4464         iscsit_dec_conn_usage_count(l_conn);
4465 }
4466
4467 /*
4468  *      Return of 0 causes the TX thread to restart.
4469  */
4470 int iscsit_logout_post_handler(
4471         struct iscsi_cmd *cmd,
4472         struct iscsi_conn *conn)
4473 {
4474         int ret = 0;
4475
4476         switch (cmd->logout_reason) {
4477         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4478                 switch (cmd->logout_response) {
4479                 case ISCSI_LOGOUT_SUCCESS:
4480                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4481                 default:
4482                         iscsit_logout_post_handler_closesession(conn);
4483                         break;
4484                 }
4485                 ret = 0;
4486                 break;
4487         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4488                 if (conn->cid == cmd->logout_cid) {
4489                         switch (cmd->logout_response) {
4490                         case ISCSI_LOGOUT_SUCCESS:
4491                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4492                         default:
4493                                 iscsit_logout_post_handler_samecid(conn);
4494                                 break;
4495                         }
4496                         ret = 0;
4497                 } else {
4498                         switch (cmd->logout_response) {
4499                         case ISCSI_LOGOUT_SUCCESS:
4500                                 iscsit_logout_post_handler_diffcid(conn,
4501                                         cmd->logout_cid);
4502                                 break;
4503                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4504                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4505                         default:
4506                                 break;
4507                         }
4508                         ret = 1;
4509                 }
4510                 break;
4511         case ISCSI_LOGOUT_REASON_RECOVERY:
4512                 switch (cmd->logout_response) {
4513                 case ISCSI_LOGOUT_SUCCESS:
4514                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4515                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4516                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4517                 default:
4518                         break;
4519                 }
4520                 ret = 1;
4521                 break;
4522         default:
4523                 break;
4524
4525         }
4526         return ret;
4527 }
4528 EXPORT_SYMBOL(iscsit_logout_post_handler);
4529
4530 void iscsit_fail_session(struct iscsi_session *sess)
4531 {
4532         struct iscsi_conn *conn;
4533
4534         spin_lock_bh(&sess->conn_lock);
4535         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4536                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4537                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4538         }
4539         spin_unlock_bh(&sess->conn_lock);
4540
4541         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4542         sess->session_state = TARG_SESS_STATE_FAILED;
4543 }
4544
4545 int iscsit_free_session(struct iscsi_session *sess)
4546 {
4547         u16 conn_count = atomic_read(&sess->nconn);
4548         struct iscsi_conn *conn, *conn_tmp = NULL;
4549         int is_last;
4550
4551         spin_lock_bh(&sess->conn_lock);
4552         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4553
4554         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4555                         conn_list) {
4556                 if (conn_count == 0)
4557                         break;
4558
4559                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4560                         is_last = 1;
4561                 } else {
4562                         iscsit_inc_conn_usage_count(conn_tmp);
4563                         is_last = 0;
4564                 }
4565                 iscsit_inc_conn_usage_count(conn);
4566
4567                 spin_unlock_bh(&sess->conn_lock);
4568                 iscsit_cause_connection_reinstatement(conn, 1);
4569                 spin_lock_bh(&sess->conn_lock);
4570
4571                 iscsit_dec_conn_usage_count(conn);
4572                 if (is_last == 0)
4573                         iscsit_dec_conn_usage_count(conn_tmp);
4574
4575                 conn_count--;
4576         }
4577
4578         if (atomic_read(&sess->nconn)) {
4579                 spin_unlock_bh(&sess->conn_lock);
4580                 wait_for_completion(&sess->session_wait_comp);
4581         } else
4582                 spin_unlock_bh(&sess->conn_lock);
4583
4584         iscsit_close_session(sess);
4585         return 0;
4586 }
4587
4588 void iscsit_stop_session(
4589         struct iscsi_session *sess,
4590         int session_sleep,
4591         int connection_sleep)
4592 {
4593         u16 conn_count = atomic_read(&sess->nconn);
4594         struct iscsi_conn *conn, *conn_tmp = NULL;
4595         int is_last;
4596
4597         spin_lock_bh(&sess->conn_lock);
4598         if (session_sleep)
4599                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4600
4601         if (connection_sleep) {
4602                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4603                                 conn_list) {
4604                         if (conn_count == 0)
4605                                 break;
4606
4607                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4608                                 is_last = 1;
4609                         } else {
4610                                 iscsit_inc_conn_usage_count(conn_tmp);
4611                                 is_last = 0;
4612                         }
4613                         iscsit_inc_conn_usage_count(conn);
4614
4615                         spin_unlock_bh(&sess->conn_lock);
4616                         iscsit_cause_connection_reinstatement(conn, 1);
4617                         spin_lock_bh(&sess->conn_lock);
4618
4619                         iscsit_dec_conn_usage_count(conn);
4620                         if (is_last == 0)
4621                                 iscsit_dec_conn_usage_count(conn_tmp);
4622                         conn_count--;
4623                 }
4624         } else {
4625                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4626                         iscsit_cause_connection_reinstatement(conn, 0);
4627         }
4628
4629         if (session_sleep && atomic_read(&sess->nconn)) {
4630                 spin_unlock_bh(&sess->conn_lock);
4631                 wait_for_completion(&sess->session_wait_comp);
4632         } else
4633                 spin_unlock_bh(&sess->conn_lock);
4634 }
4635
4636 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4637 {
4638         struct iscsi_session *sess;
4639         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4640         struct se_session *se_sess, *se_sess_tmp;
4641         LIST_HEAD(free_list);
4642         int session_count = 0;
4643
4644         spin_lock_bh(&se_tpg->session_lock);
4645         if (tpg->nsessions && !force) {
4646                 spin_unlock_bh(&se_tpg->session_lock);
4647                 return -1;
4648         }
4649
4650         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4651                         sess_list) {
4652                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4653
4654                 spin_lock(&sess->conn_lock);
4655                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4656                     atomic_read(&sess->session_logout) ||
4657                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4658                         spin_unlock(&sess->conn_lock);
4659                         continue;
4660                 }
4661                 atomic_set(&sess->session_reinstatement, 1);
4662                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4663                 spin_unlock(&sess->conn_lock);
4664
4665                 list_move_tail(&se_sess->sess_list, &free_list);
4666         }
4667         spin_unlock_bh(&se_tpg->session_lock);
4668
4669         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4670                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4671
4672                 iscsit_free_session(sess);
4673                 session_count++;
4674         }
4675
4676         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4677                         " Group: %hu\n", session_count, tpg->tpgt);
4678         return 0;
4679 }
4680
4681 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4682 MODULE_VERSION("4.1.x");
4683 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4684 MODULE_LICENSE("GPL");
4685
4686 module_init(iscsi_target_init_module);
4687 module_exit(iscsi_target_cleanup_module);