drivers/target/iscsi/iscsi_target.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*******************************************************************************
   3  * This file contains main functions related to the iSCSI Target Core Driver.
   4  *
   5  * (c) Copyright 2007-2013 Datera, Inc.
   6  *
   7  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   8  *
   9  ******************************************************************************/
  10
  11 #include <crypto/hash.h>
  12 #include <linux/string.h>
  13 #include <linux/kthread.h>
  14 #include <linux/completion.h>
  15 #include <linux/module.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/idr.h>
  18 #include <linux/delay.h>
  19 #include <linux/sched/signal.h>
  20 #include <asm/unaligned.h>
  21 #include <linux/inet.h>
  22 #include <net/ipv6.h>
  23 #include <scsi/scsi_proto.h>
  24 #include <scsi/iscsi_proto.h>
  25 #include <scsi/scsi_tcq.h>
  26 #include <target/target_core_base.h>
  27 #include <target/target_core_fabric.h>
  28
  29 #include <target/iscsi/iscsi_target_core.h>
  30 #include "iscsi_target_parameters.h"
  31 #include "iscsi_target_seq_pdu_list.h"
  32 #include "iscsi_target_datain_values.h"
  33 #include "iscsi_target_erl0.h"
  34 #include "iscsi_target_erl1.h"
  35 #include "iscsi_target_erl2.h"
  36 #include "iscsi_target_login.h"
  37 #include "iscsi_target_tmr.h"
  38 #include "iscsi_target_tpg.h"
  39 #include "iscsi_target_util.h"
  40 #include "iscsi_target.h"
  41 #include "iscsi_target_device.h"
  42 #include <target/iscsi/iscsi_target_stat.h>
  43
  44 #include <target/iscsi/iscsi_transport.h>
  45
  46 static LIST_HEAD(g_tiqn_list);
  47 static LIST_HEAD(g_np_list);
  48 static DEFINE_SPINLOCK(tiqn_lock);
  49 static DEFINE_MUTEX(np_lock);
  50
  51 static struct idr tiqn_idr;
  52 DEFINE_IDA(sess_ida);
  53 struct mutex auth_id_lock;
  54
  55 struct iscsit_global *iscsit_global;
  56
  57 struct kmem_cache *lio_qr_cache;
  58 struct kmem_cache *lio_dr_cache;
  59 struct kmem_cache *lio_ooo_cache;
  60 struct kmem_cache *lio_r2t_cache;
  61
  62 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  63                         struct iscsi_scsi_req *, u32);
  64
  65 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  66 {
  67         struct iscsi_tiqn *tiqn = NULL;
  68
  69         spin_lock(&tiqn_lock);
  70         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  71                 if (!strcmp(tiqn->tiqn, buf)) {
  72
  73                         spin_lock(&tiqn->tiqn_state_lock);
  74                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  75                                 tiqn->tiqn_access_count++;
  76                                 spin_unlock(&tiqn->tiqn_state_lock);
  77                                 spin_unlock(&tiqn_lock);
  78                                 return tiqn;
  79                         }
  80                         spin_unlock(&tiqn->tiqn_state_lock);
  81                 }
  82         }
  83         spin_unlock(&tiqn_lock);
  84
  85         return NULL;
  86 }
  87
  88 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  89 {
  90         spin_lock(&tiqn->tiqn_state_lock);
  91         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  92                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  93                 spin_unlock(&tiqn->tiqn_state_lock);
  94                 return 0;
  95         }
  96         spin_unlock(&tiqn->tiqn_state_lock);
  97
  98         return -1;
  99 }
 100
 101 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 102 {
 103         spin_lock(&tiqn->tiqn_state_lock);
 104         tiqn->tiqn_access_count--;
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106 }
 107
 108 /*
 109  * Note that IQN formatting is expected to be done in userspace, and
 110  * no explict IQN format checks are done here.
 111  */
 112 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 113 {
 114         struct iscsi_tiqn *tiqn = NULL;
 115         int ret;
 116
 117         if (strlen(buf) >= ISCSI_IQN_LEN) {
 118                 pr_err("Target IQN exceeds %d bytes\n",
 119                                 ISCSI_IQN_LEN);
 120                 return ERR_PTR(-EINVAL);
 121         }
 122
 123         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 124         if (!tiqn)
 125                 return ERR_PTR(-ENOMEM);
 126
 127         sprintf(tiqn->tiqn, "%s", buf);
 128         INIT_LIST_HEAD(&tiqn->tiqn_list);
 129         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 130         spin_lock_init(&tiqn->tiqn_state_lock);
 131         spin_lock_init(&tiqn->tiqn_tpg_lock);
 132         spin_lock_init(&tiqn->sess_err_stats.lock);
 133         spin_lock_init(&tiqn->login_stats.lock);
 134         spin_lock_init(&tiqn->logout_stats.lock);
 135
 136         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 137
 138         idr_preload(GFP_KERNEL);
 139         spin_lock(&tiqn_lock);
 140
 141         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 142         if (ret < 0) {
 143                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 144                 spin_unlock(&tiqn_lock);
 145                 idr_preload_end();
 146                 kfree(tiqn);
 147                 return ERR_PTR(ret);
 148         }
 149         tiqn->tiqn_index = ret;
 150         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 151
 152         spin_unlock(&tiqn_lock);
 153         idr_preload_end();
 154
 155         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 156
 157         return tiqn;
 158
 159 }
 160
 161 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 162 {
 163         /*
 164          * Wait for accesses to said struct iscsi_tiqn to end.
 165          */
 166         spin_lock(&tiqn->tiqn_state_lock);
 167         while (tiqn->tiqn_access_count != 0) {
 168                 spin_unlock(&tiqn->tiqn_state_lock);
 169                 msleep(10);
 170                 spin_lock(&tiqn->tiqn_state_lock);
 171         }
 172         spin_unlock(&tiqn->tiqn_state_lock);
 173 }
 174
 175 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 176 {
 177         /*
 178          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 179          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 180          * attempts to access this struct iscsi_tiqn will fail from both transport
 181          * fabric and control code paths.
 182          */
 183         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 184                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 185                 return;
 186         }
 187
 188         iscsit_wait_for_tiqn(tiqn);
 189
 190         spin_lock(&tiqn_lock);
 191         list_del(&tiqn->tiqn_list);
 192         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 193         spin_unlock(&tiqn_lock);
 194
 195         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 196                         tiqn->tiqn);
 197         kfree(tiqn);
 198 }
 199
 200 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 201 {
 202         int ret;
 203         /*
 204          * Determine if the network portal is accepting storage traffic.
 205          */
 206         spin_lock_bh(&np->np_thread_lock);
 207         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 208                 spin_unlock_bh(&np->np_thread_lock);
 209                 return -1;
 210         }
 211         spin_unlock_bh(&np->np_thread_lock);
 212         /*
 213          * Determine if the portal group is accepting storage traffic.
 214          */
 215         spin_lock_bh(&tpg->tpg_state_lock);
 216         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 217                 spin_unlock_bh(&tpg->tpg_state_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&tpg->tpg_state_lock);
 221
 222         /*
 223          * Here we serialize access across the TIQN+TPG Tuple.
 224          */
 225         ret = down_interruptible(&tpg->np_login_sem);
 226         if (ret != 0)
 227                 return -1;
 228
 229         spin_lock_bh(&tpg->tpg_state_lock);
 230         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 231                 spin_unlock_bh(&tpg->tpg_state_lock);
 232                 up(&tpg->np_login_sem);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         return 0;
 238 }
 239
 240 void iscsit_login_kref_put(struct kref *kref)
 241 {
 242         struct iscsi_tpg_np *tpg_np = container_of(kref,
 243                                 struct iscsi_tpg_np, tpg_np_kref);
 244
 245         complete(&tpg_np->tpg_np_comp);
 246 }
 247
 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 249                        struct iscsi_tpg_np *tpg_np)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         up(&tpg->np_login_sem);
 254
 255         if (tpg_np)
 256                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 257
 258         if (tiqn)
 259                 iscsit_put_tiqn_for_login(tiqn);
 260
 261         return 0;
 262 }
 263
 264 bool iscsit_check_np_match(
 265         struct sockaddr_storage *sockaddr,
 266         struct iscsi_np *np,
 267         int network_transport)
 268 {
 269         struct sockaddr_in *sock_in, *sock_in_e;
 270         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 271         bool ip_match = false;
 272         u16 port, port_e;
 273
 274         if (sockaddr->ss_family == AF_INET6) {
 275                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 276                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 277
 278                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 279                             &sock_in6_e->sin6_addr.in6_u,
 280                             sizeof(struct in6_addr)))
 281                         ip_match = true;
 282
 283                 port = ntohs(sock_in6->sin6_port);
 284                 port_e = ntohs(sock_in6_e->sin6_port);
 285         } else {
 286                 sock_in = (struct sockaddr_in *)sockaddr;
 287                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 288
 289                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in->sin_port);
 293                 port_e = ntohs(sock_in_e->sin_port);
 294         }
 295
 296         if (ip_match && (port_e == port) &&
 297             (np->np_network_transport == network_transport))
 298                 return true;
 299
 300         return false;
 301 }
 302
 303 static struct iscsi_np *iscsit_get_np(
 304         struct sockaddr_storage *sockaddr,
 305         int network_transport)
 306 {
 307         struct iscsi_np *np;
 308         bool match;
 309
 310         lockdep_assert_held(&np_lock);
 311
 312         list_for_each_entry(np, &g_np_list, np_list) {
 313                 spin_lock_bh(&np->np_thread_lock);
 314                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 315                         spin_unlock_bh(&np->np_thread_lock);
 316                         continue;
 317                 }
 318
 319                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 320                 if (match) {
 321                         /*
 322                          * Increment the np_exports reference count now to
 323                          * prevent iscsit_del_np() below from being called
 324                          * while iscsi_tpg_add_network_portal() is called.
 325                          */
 326                         np->np_exports++;
 327                         spin_unlock_bh(&np->np_thread_lock);
 328                         return np;
 329                 }
 330                 spin_unlock_bh(&np->np_thread_lock);
 331         }
 332
 333         return NULL;
 334 }
 335
 336 struct iscsi_np *iscsit_add_np(
 337         struct sockaddr_storage *sockaddr,
 338         int network_transport)
 339 {
 340         struct iscsi_np *np;
 341         int ret;
 342
 343         mutex_lock(&np_lock);
 344
 345         /*
 346          * Locate the existing struct iscsi_np if already active..
 347          */
 348         np = iscsit_get_np(sockaddr, network_transport);
 349         if (np) {
 350                 mutex_unlock(&np_lock);
 351                 return np;
 352         }
 353
 354         np = kzalloc(sizeof(*np), GFP_KERNEL);
 355         if (!np) {
 356                 mutex_unlock(&np_lock);
 357                 return ERR_PTR(-ENOMEM);
 358         }
 359
 360         np->np_flags |= NPF_IP_NETWORK;
 361         np->np_network_transport = network_transport;
 362         spin_lock_init(&np->np_thread_lock);
 363         init_completion(&np->np_restart_comp);
 364         INIT_LIST_HEAD(&np->np_list);
 365
 366         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 367
 368         ret = iscsi_target_setup_login_socket(np, sockaddr);
 369         if (ret != 0) {
 370                 kfree(np);
 371                 mutex_unlock(&np_lock);
 372                 return ERR_PTR(ret);
 373         }
 374
 375         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 376         if (IS_ERR(np->np_thread)) {
 377                 pr_err("Unable to create kthread: iscsi_np\n");
 378                 ret = PTR_ERR(np->np_thread);
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383         /*
 384          * Increment the np_exports reference count now to prevent
 385          * iscsit_del_np() below from being run while a new call to
 386          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 387          * active.  We don't need to hold np->np_thread_lock at this
 388          * point because iscsi_np has not been added to g_np_list yet.
 389          */
 390         np->np_exports = 1;
 391         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 392
 393         list_add_tail(&np->np_list, &g_np_list);
 394         mutex_unlock(&np_lock);
 395
 396         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 397                 &np->np_sockaddr, np->np_transport->name);
 398
 399         return np;
 400 }
 401
 402 int iscsit_reset_np_thread(
 403         struct iscsi_np *np,
 404         struct iscsi_tpg_np *tpg_np,
 405         struct iscsi_portal_group *tpg,
 406         bool shutdown)
 407 {
 408         spin_lock_bh(&np->np_thread_lock);
 409         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 410                 spin_unlock_bh(&np->np_thread_lock);
 411                 return 0;
 412         }
 413         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 414         atomic_inc(&np->np_reset_count);
 415
 416         if (np->np_thread) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 send_sig(SIGINT, np->np_thread, 1);
 419                 wait_for_completion(&np->np_restart_comp);
 420                 spin_lock_bh(&np->np_thread_lock);
 421         }
 422         spin_unlock_bh(&np->np_thread_lock);
 423
 424         if (tpg_np && shutdown) {
 425                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 426
 427                 wait_for_completion(&tpg_np->tpg_np_comp);
 428         }
 429
 430         return 0;
 431 }
 432
 433 static void iscsit_free_np(struct iscsi_np *np)
 434 {
 435         if (np->np_socket)
 436                 sock_release(np->np_socket);
 437 }
 438
 439 int iscsit_del_np(struct iscsi_np *np)
 440 {
 441         spin_lock_bh(&np->np_thread_lock);
 442         np->np_exports--;
 443         if (np->np_exports) {
 444                 np->enabled = true;
 445                 spin_unlock_bh(&np->np_thread_lock);
 446                 return 0;
 447         }
 448         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 449         spin_unlock_bh(&np->np_thread_lock);
 450
 451         if (np->np_thread) {
 452                 /*
 453                  * We need to send the signal to wakeup Linux/Net
 454                  * which may be sleeping in sock_accept()..
 455                  */
 456                 send_sig(SIGINT, np->np_thread, 1);
 457                 kthread_stop(np->np_thread);
 458                 np->np_thread = NULL;
 459         }
 460
 461         np->np_transport->iscsit_free_np(np);
 462
 463         mutex_lock(&np_lock);
 464         list_del(&np->np_list);
 465         mutex_unlock(&np_lock);
 466
 467         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 468                 &np->np_sockaddr, np->np_transport->name);
 469
 470         iscsit_put_transport(np->np_transport);
 471         kfree(np);
 472         return 0;
 473 }
 474
 475 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 476
 477 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 478 {
 479         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 480 }
 481 EXPORT_SYMBOL(iscsit_queue_rsp);
 482
 483 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 484 {
 485         spin_lock_bh(&conn->cmd_lock);
 486         if (!list_empty(&cmd->i_conn_node))
 487                 list_del_init(&cmd->i_conn_node);
 488         spin_unlock_bh(&conn->cmd_lock);
 489
 490         __iscsit_free_cmd(cmd, true);
 491 }
 492 EXPORT_SYMBOL(iscsit_aborted_task);
 493
 494 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 495                                       u32, u32, const void *, void *);
 496 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 497
 498 static int
 499 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 500                           const void *data_buf, u32 data_buf_len)
 501 {
 502         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 503         struct kvec *iov;
 504         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 505         int ret;
 506
 507         iov = &cmd->iov_misc[0];
 508         iov[niov].iov_base      = cmd->pdu;
 509         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 510
 511         if (conn->conn_ops->HeaderDigest) {
 512                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 513
 514                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 515                                           ISCSI_HDR_LEN, 0, NULL,
 516                                           header_digest);
 517
 518                 iov[0].iov_len += ISCSI_CRC_LEN;
 519                 tx_size += ISCSI_CRC_LEN;
 520                 pr_debug("Attaching CRC32C HeaderDigest"
 521                          " to opcode 0x%x 0x%08x\n",
 522                          hdr->opcode, *header_digest);
 523         }
 524
 525         if (data_buf_len) {
 526                 u32 padding = ((-data_buf_len) & 3);
 527
 528                 iov[niov].iov_base      = (void *)data_buf;
 529                 iov[niov++].iov_len     = data_buf_len;
 530                 tx_size += data_buf_len;
 531
 532                 if (padding != 0) {
 533                         iov[niov].iov_base = &cmd->pad_bytes;
 534                         iov[niov++].iov_len = padding;
 535                         tx_size += padding;
 536                         pr_debug("Attaching %u additional"
 537                                  " padding bytes.\n", padding);
 538                 }
 539
 540                 if (conn->conn_ops->DataDigest) {
 541                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 542                                                   data_buf, data_buf_len,
 543                                                   padding, &cmd->pad_bytes,
 544                                                   &cmd->data_crc);
 545
 546                         iov[niov].iov_base = &cmd->data_crc;
 547                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 548                         tx_size += ISCSI_CRC_LEN;
 549                         pr_debug("Attached DataDigest for %u"
 550                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 551                                  data_buf_len, hdr->opcode, cmd->data_crc);
 552                 }
 553         }
 554
 555         cmd->iov_misc_count = niov;
 556         cmd->tx_size = tx_size;
 557
 558         ret = iscsit_send_tx_data(cmd, conn, 1);
 559         if (ret < 0) {
 560                 iscsit_tx_thread_wait_for_tcp(conn);
 561                 return ret;
 562         }
 563
 564         return 0;
 565 }
 566
 567 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
 568                             u32 data_offset, u32 data_length);
 569 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 570 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 571                                     u32, u32, u32, u8 *);
 572 static int
 573 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 574                        const struct iscsi_datain *datain)
 575 {
 576         struct kvec *iov;
 577         u32 iov_count = 0, tx_size = 0;
 578         int ret, iov_ret;
 579
 580         iov = &cmd->iov_data[0];
 581         iov[iov_count].iov_base = cmd->pdu;
 582         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 583         tx_size += ISCSI_HDR_LEN;
 584
 585         if (conn->conn_ops->HeaderDigest) {
 586                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 587
 588                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 589                                           ISCSI_HDR_LEN, 0, NULL,
 590                                           header_digest);
 591
 592                 iov[0].iov_len += ISCSI_CRC_LEN;
 593                 tx_size += ISCSI_CRC_LEN;
 594
 595                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 596                          *header_digest);
 597         }
 598
 599         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[iov_count],
 600                                    cmd->orig_iov_data_count - (iov_count + 2),
 601                                    datain->offset, datain->length);
 602         if (iov_ret < 0)
 603                 return -1;
 604
 605         iov_count += iov_ret;
 606         tx_size += datain->length;
 607
 608         cmd->padding = ((-datain->length) & 3);
 609         if (cmd->padding) {
 610                 iov[iov_count].iov_base         = cmd->pad_bytes;
 611                 iov[iov_count++].iov_len        = cmd->padding;
 612                 tx_size += cmd->padding;
 613
 614                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 615         }
 616
 617         if (conn->conn_ops->DataDigest) {
 618                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 619                                                          cmd, datain->offset,
 620                                                          datain->length,
 621                                                          cmd->padding,
 622                                                          cmd->pad_bytes);
 623
 624                 iov[iov_count].iov_base = &cmd->data_crc;
 625                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 626                 tx_size += ISCSI_CRC_LEN;
 627
 628                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 629                          datain->length + cmd->padding, cmd->data_crc);
 630         }
 631
 632         cmd->iov_data_count = iov_count;
 633         cmd->tx_size = tx_size;
 634
 635         ret = iscsit_fe_sendpage_sg(cmd, conn);
 636
 637         iscsit_unmap_iovec(cmd);
 638
 639         if (ret < 0) {
 640                 iscsit_tx_thread_wait_for_tcp(conn);
 641                 return ret;
 642         }
 643
 644         return 0;
 645 }
 646
 647 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 648                            struct iscsi_datain_req *dr, const void *buf,
 649                            u32 buf_len)
 650 {
 651         if (dr)
 652                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 653         else
 654                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 655 }
 656
 657 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 658 {
 659         return TARGET_PROT_NORMAL;
 660 }
 661
 662 static struct iscsit_transport iscsi_target_transport = {
 663         .name                   = "iSCSI/TCP",
 664         .transport_type         = ISCSI_TCP,
 665         .rdma_shutdown          = false,
 666         .owner                  = NULL,
 667         .iscsit_setup_np        = iscsit_setup_np,
 668         .iscsit_accept_np       = iscsit_accept_np,
 669         .iscsit_free_np         = iscsit_free_np,
 670         .iscsit_get_login_rx    = iscsit_get_login_rx,
 671         .iscsit_put_login_tx    = iscsit_put_login_tx,
 672         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 673         .iscsit_immediate_queue = iscsit_immediate_queue,
 674         .iscsit_response_queue  = iscsit_response_queue,
 675         .iscsit_queue_data_in   = iscsit_queue_rsp,
 676         .iscsit_queue_status    = iscsit_queue_rsp,
 677         .iscsit_aborted_task    = iscsit_aborted_task,
 678         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 679         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 680         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 681 };
 682
 683 static int __init iscsi_target_init_module(void)
 684 {
 685         int ret = 0, size;
 686
 687         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 688         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 689         if (!iscsit_global)
 690                 return -1;
 691
 692         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 693         mutex_init(&auth_id_lock);
 694         idr_init(&tiqn_idr);
 695
 696         ret = target_register_template(&iscsi_ops);
 697         if (ret)
 698                 goto out;
 699
 700         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 701         iscsit_global->ts_bitmap = vzalloc(size);
 702         if (!iscsit_global->ts_bitmap)
 703                 goto configfs_out;
 704
 705         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 706                         sizeof(struct iscsi_queue_req),
 707                         __alignof__(struct iscsi_queue_req), 0, NULL);
 708         if (!lio_qr_cache) {
 709                 pr_err("Unable to kmem_cache_create() for"
 710                                 " lio_qr_cache\n");
 711                 goto bitmap_out;
 712         }
 713
 714         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 715                         sizeof(struct iscsi_datain_req),
 716                         __alignof__(struct iscsi_datain_req), 0, NULL);
 717         if (!lio_dr_cache) {
 718                 pr_err("Unable to kmem_cache_create() for"
 719                                 " lio_dr_cache\n");
 720                 goto qr_out;
 721         }
 722
 723         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 724                         sizeof(struct iscsi_ooo_cmdsn),
 725                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 726         if (!lio_ooo_cache) {
 727                 pr_err("Unable to kmem_cache_create() for"
 728                                 " lio_ooo_cache\n");
 729                 goto dr_out;
 730         }
 731
 732         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 733                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 734                         0, NULL);
 735         if (!lio_r2t_cache) {
 736                 pr_err("Unable to kmem_cache_create() for"
 737                                 " lio_r2t_cache\n");
 738                 goto ooo_out;
 739         }
 740
 741         iscsit_register_transport(&iscsi_target_transport);
 742
 743         if (iscsit_load_discovery_tpg() < 0)
 744                 goto r2t_out;
 745
 746         return ret;
 747 r2t_out:
 748         iscsit_unregister_transport(&iscsi_target_transport);
 749         kmem_cache_destroy(lio_r2t_cache);
 750 ooo_out:
 751         kmem_cache_destroy(lio_ooo_cache);
 752 dr_out:
 753         kmem_cache_destroy(lio_dr_cache);
 754 qr_out:
 755         kmem_cache_destroy(lio_qr_cache);
 756 bitmap_out:
 757         vfree(iscsit_global->ts_bitmap);
 758 configfs_out:
 759         /* XXX: this probably wants it to be it's own unwind step.. */
 760         if (iscsit_global->discovery_tpg)
 761                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 762         target_unregister_template(&iscsi_ops);
 763 out:
 764         kfree(iscsit_global);
 765         return -ENOMEM;
 766 }
 767
 768 static void __exit iscsi_target_cleanup_module(void)
 769 {
 770         iscsit_release_discovery_tpg();
 771         iscsit_unregister_transport(&iscsi_target_transport);
 772         kmem_cache_destroy(lio_qr_cache);
 773         kmem_cache_destroy(lio_dr_cache);
 774         kmem_cache_destroy(lio_ooo_cache);
 775         kmem_cache_destroy(lio_r2t_cache);
 776
 777         /*
 778          * Shutdown discovery sessions and disable discovery TPG
 779          */
 780         if (iscsit_global->discovery_tpg)
 781                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 782
 783         target_unregister_template(&iscsi_ops);
 784
 785         vfree(iscsit_global->ts_bitmap);
 786         kfree(iscsit_global);
 787 }
 788
 789 int iscsit_add_reject(
 790         struct iscsi_conn *conn,
 791         u8 reason,
 792         unsigned char *buf)
 793 {
 794         struct iscsi_cmd *cmd;
 795
 796         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 797         if (!cmd)
 798                 return -1;
 799
 800         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 801         cmd->reject_reason = reason;
 802
 803         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 804         if (!cmd->buf_ptr) {
 805                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 806                 iscsit_free_cmd(cmd, false);
 807                 return -1;
 808         }
 809
 810         spin_lock_bh(&conn->cmd_lock);
 811         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 812         spin_unlock_bh(&conn->cmd_lock);
 813
 814         cmd->i_state = ISTATE_SEND_REJECT;
 815         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 816
 817         return -1;
 818 }
 819 EXPORT_SYMBOL(iscsit_add_reject);
 820
 821 static int iscsit_add_reject_from_cmd(
 822         struct iscsi_cmd *cmd,
 823         u8 reason,
 824         bool add_to_conn,
 825         unsigned char *buf)
 826 {
 827         struct iscsi_conn *conn;
 828         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 829
 830         if (!cmd->conn) {
 831                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 832                                 cmd->init_task_tag);
 833                 return -1;
 834         }
 835         conn = cmd->conn;
 836
 837         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 838         cmd->reject_reason = reason;
 839
 840         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 841         if (!cmd->buf_ptr) {
 842                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 843                 iscsit_free_cmd(cmd, false);
 844                 return -1;
 845         }
 846
 847         if (add_to_conn) {
 848                 spin_lock_bh(&conn->cmd_lock);
 849                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 850                 spin_unlock_bh(&conn->cmd_lock);
 851         }
 852
 853         cmd->i_state = ISTATE_SEND_REJECT;
 854         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 855         /*
 856          * Perform the kref_put now if se_cmd has already been setup by
 857          * scsit_setup_scsi_cmd()
 858          */
 859         if (do_put) {
 860                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 861                 target_put_sess_cmd(&cmd->se_cmd);
 862         }
 863         return -1;
 864 }
 865
 866 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 867                                  unsigned char *buf)
 868 {
 869         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 870 }
 871
 872 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 873 {
 874         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 875 }
 876 EXPORT_SYMBOL(iscsit_reject_cmd);
 877
 878 /*
 879  * Map some portion of the allocated scatterlist to an iovec, suitable for
 880  * kernel sockets to copy data in/out.
 881  */
 882 static int iscsit_map_iovec(struct iscsi_cmd *cmd, struct kvec *iov, int nvec,
 883                             u32 data_offset, u32 data_length)
 884 {
 885         u32 i = 0, orig_data_length = data_length;
 886         struct scatterlist *sg;
 887         unsigned int page_off;
 888
 889         /*
 890          * We know each entry in t_data_sg contains a page.
 891          */
 892         u32 ent = data_offset / PAGE_SIZE;
 893
 894         if (!data_length)
 895                 return 0;
 896
 897         if (ent >= cmd->se_cmd.t_data_nents) {
 898                 pr_err("Initial page entry out-of-bounds\n");
 899                 goto overflow;
 900         }
 901
 902         sg = &cmd->se_cmd.t_data_sg[ent];
 903         page_off = (data_offset % PAGE_SIZE);
 904
 905         cmd->first_data_sg = sg;
 906         cmd->first_data_sg_off = page_off;
 907
 908         while (data_length) {
 909                 u32 cur_len;
 910
 911                 if (WARN_ON_ONCE(!sg || i >= nvec))
 912                         goto overflow;
 913
 914                 cur_len = min_t(u32, data_length, sg->length - page_off);
 915
 916                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 917                 iov[i].iov_len = cur_len;
 918
 919                 data_length -= cur_len;
 920                 page_off = 0;
 921                 sg = sg_next(sg);
 922                 i++;
 923         }
 924
 925         cmd->kmapped_nents = i;
 926
 927         return i;
 928
 929 overflow:
 930         pr_err("offset %d + length %d overflow; %d/%d; sg-list:\n",
 931                data_offset, orig_data_length, i, nvec);
 932         for_each_sg(cmd->se_cmd.t_data_sg, sg,
 933                     cmd->se_cmd.t_data_nents, i) {
 934                 pr_err("[%d] off %d len %d\n",
 935                        i, sg->offset, sg->length);
 936         }
 937         return -1;
 938 }
 939
 940 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 941 {
 942         u32 i;
 943         struct scatterlist *sg;
 944
 945         sg = cmd->first_data_sg;
 946
 947         for (i = 0; i < cmd->kmapped_nents; i++)
 948                 kunmap(sg_page(&sg[i]));
 949 }
 950
 951 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 952 {
 953         LIST_HEAD(ack_list);
 954         struct iscsi_cmd *cmd, *cmd_p;
 955
 956         conn->exp_statsn = exp_statsn;
 957
 958         if (conn->sess->sess_ops->RDMAExtensions)
 959                 return;
 960
 961         spin_lock_bh(&conn->cmd_lock);
 962         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 963                 spin_lock(&cmd->istate_lock);
 964                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 965                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 966                         cmd->i_state = ISTATE_REMOVE;
 967                         spin_unlock(&cmd->istate_lock);
 968                         list_move_tail(&cmd->i_conn_node, &ack_list);
 969                         continue;
 970                 }
 971                 spin_unlock(&cmd->istate_lock);
 972         }
 973         spin_unlock_bh(&conn->cmd_lock);
 974
 975         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 976                 list_del_init(&cmd->i_conn_node);
 977                 iscsit_free_cmd(cmd, false);
 978         }
 979 }
 980
 981 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 982 {
 983         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 984
 985         iov_count += ISCSI_IOV_DATA_BUFFER;
 986         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 987         if (!cmd->iov_data)
 988                 return -ENOMEM;
 989
 990         cmd->orig_iov_data_count = iov_count;
 991         return 0;
 992 }
 993
 994 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 995                           unsigned char *buf)
 996 {
 997         int data_direction, payload_length;
 998         struct iscsi_scsi_req *hdr;
 999         int iscsi_task_attr;
1000         int sam_task_attr;
1001
1002         atomic_long_inc(&conn->sess->cmd_pdus);
1003
1004         hdr                     = (struct iscsi_scsi_req *) buf;
1005         payload_length          = ntoh24(hdr->dlength);
1006
1007         /* FIXME; Add checks for AdditionalHeaderSegment */
1008
1009         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1010             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1011                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1012                                 " not set. Bad iSCSI Initiator.\n");
1013                 return iscsit_add_reject_cmd(cmd,
1014                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1015         }
1016
1017         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1018              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1019                 /*
1020                  * From RFC-3720 Section 10.3.1:
1021                  *
1022                  * "Either or both of R and W MAY be 1 when either the
1023                  *  Expected Data Transfer Length and/or Bidirectional Read
1024                  *  Expected Data Transfer Length are 0"
1025                  *
1026                  * For this case, go ahead and clear the unnecssary bits
1027                  * to avoid any confusion with ->data_direction.
1028                  */
1029                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1030                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1031
1032                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1033                         " set when Expected Data Transfer Length is 0 for"
1034                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1035         }
1036
1037         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1038             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1039                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1040                         " MUST be set if Expected Data Transfer Length is not 0."
1041                         " Bad iSCSI Initiator\n");
1042                 return iscsit_add_reject_cmd(cmd,
1043                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1044         }
1045
1046         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1047             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1048                 pr_err("Bidirectional operations not supported!\n");
1049                 return iscsit_add_reject_cmd(cmd,
1050                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1051         }
1052
1053         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1054                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1055                                 " Scsi Command PDU.\n");
1056                 return iscsit_add_reject_cmd(cmd,
1057                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1058         }
1059
1060         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1061                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1062                         " protocol error.\n", payload_length);
1063                 return iscsit_add_reject_cmd(cmd,
1064                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1065         }
1066
1067         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1068             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1069                 pr_err("Expected Data Transfer Length and Length of"
1070                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1071                         " bit is not set protocol error\n");
1072                 return iscsit_add_reject_cmd(cmd,
1073                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1074         }
1075
1076         if (payload_length > be32_to_cpu(hdr->data_length)) {
1077                 pr_err("DataSegmentLength: %u is greater than"
1078                         " EDTL: %u, protocol error.\n", payload_length,
1079                                 hdr->data_length);
1080                 return iscsit_add_reject_cmd(cmd,
1081                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1082         }
1083
1084         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1085                 pr_err("DataSegmentLength: %u is greater than"
1086                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1087                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1088                 return iscsit_add_reject_cmd(cmd,
1089                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1090         }
1091
1092         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1093                 pr_err("DataSegmentLength: %u is greater than"
1094                         " FirstBurstLength: %u, protocol error.\n",
1095                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1096                 return iscsit_add_reject_cmd(cmd,
1097                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1098         }
1099
1100         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1101                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1102                           DMA_NONE;
1103
1104         cmd->data_direction = data_direction;
1105         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1106         /*
1107          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1108          */
1109         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1110             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1111                 sam_task_attr = TCM_SIMPLE_TAG;
1112         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1113                 sam_task_attr = TCM_ORDERED_TAG;
1114         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1115                 sam_task_attr = TCM_HEAD_TAG;
1116         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1117                 sam_task_attr = TCM_ACA_TAG;
1118         else {
1119                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1120                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1121                 sam_task_attr = TCM_SIMPLE_TAG;
1122         }
1123
1124         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1125         cmd->i_state            = ISTATE_NEW_CMD;
1126         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1127         cmd->immediate_data     = (payload_length) ? 1 : 0;
1128         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1129                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1130         if (cmd->unsolicited_data)
1131                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1132
1133         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1134         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1135                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1136         else
1137                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1138         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1139         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1140         cmd->first_burst_len    = payload_length;
1141
1142         if (!conn->sess->sess_ops->RDMAExtensions &&
1143              cmd->data_direction == DMA_FROM_DEVICE) {
1144                 struct iscsi_datain_req *dr;
1145
1146                 dr = iscsit_allocate_datain_req();
1147                 if (!dr)
1148                         return iscsit_add_reject_cmd(cmd,
1149                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1150
1151                 iscsit_attach_datain_req(cmd, dr);
1152         }
1153
1154         /*
1155          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1156          */
1157         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1158                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1159                         cmd->data_direction, sam_task_attr,
1160                         cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun));
1161
1162         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1163                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1164                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1165                 conn->cid);
1166
1167         target_get_sess_cmd(&cmd->se_cmd, true);
1168
1169         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170         cmd->sense_reason = target_cmd_init_cdb(&cmd->se_cmd, hdr->cdb);
1171         if (cmd->sense_reason) {
1172                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1173                         return iscsit_add_reject_cmd(cmd,
1174                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1175                 }
1176
1177                 goto attach_cmd;
1178         }
1179
1180         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd);
1181         if (cmd->sense_reason)
1182                 goto attach_cmd;
1183
1184         cmd->sense_reason = target_cmd_parse_cdb(&cmd->se_cmd);
1185         if (cmd->sense_reason)
1186                 goto attach_cmd;
1187
1188         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1189                 return iscsit_add_reject_cmd(cmd,
1190                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191         }
1192
1193 attach_cmd:
1194         spin_lock_bh(&conn->cmd_lock);
1195         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1196         spin_unlock_bh(&conn->cmd_lock);
1197         /*
1198          * Check if we need to delay processing because of ALUA
1199          * Active/NonOptimized primary access state..
1200          */
1201         core_alua_check_nonop_delay(&cmd->se_cmd);
1202
1203         return 0;
1204 }
1205 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1206
1207 void iscsit_set_unsolicited_dataout(struct iscsi_cmd *cmd)
1208 {
1209         iscsit_set_dataout_sequence_values(cmd);
1210
1211         spin_lock_bh(&cmd->dataout_timeout_lock);
1212         iscsit_start_dataout_timer(cmd, cmd->conn);
1213         spin_unlock_bh(&cmd->dataout_timeout_lock);
1214 }
1215 EXPORT_SYMBOL(iscsit_set_unsolicited_dataout);
1216
1217 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1218                             struct iscsi_scsi_req *hdr)
1219 {
1220         int cmdsn_ret = 0;
1221         /*
1222          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1223          * the Immediate Bit is not set, and no Immediate
1224          * Data is attached.
1225          *
1226          * A PDU/CmdSN carrying Immediate Data can only
1227          * be processed after the DataCRC has passed.
1228          * If the DataCRC fails, the CmdSN MUST NOT
1229          * be acknowledged. (See below)
1230          */
1231         if (!cmd->immediate_data) {
1232                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1233                                         (unsigned char *)hdr, hdr->cmdsn);
1234                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1235                         return -1;
1236                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1237                         target_put_sess_cmd(&cmd->se_cmd);
1238                         return 0;
1239                 }
1240         }
1241
1242         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1243
1244         /*
1245          * If no Immediate Data is attached, it's OK to return now.
1246          */
1247         if (!cmd->immediate_data) {
1248                 if (!cmd->sense_reason && cmd->unsolicited_data)
1249                         iscsit_set_unsolicited_dataout(cmd);
1250                 if (!cmd->sense_reason)
1251                         return 0;
1252
1253                 target_put_sess_cmd(&cmd->se_cmd);
1254                 return 0;
1255         }
1256
1257         /*
1258          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1259          * execution.  These exceptions are processed in CmdSN order using
1260          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1261          */
1262         if (cmd->sense_reason)
1263                 return 1;
1264         /*
1265          * Call directly into transport_generic_new_cmd() to perform
1266          * the backend memory allocation.
1267          */
1268         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1269         if (cmd->sense_reason)
1270                 return 1;
1271
1272         return 0;
1273 }
1274 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1275
1276 static int
1277 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1278                           bool dump_payload)
1279 {
1280         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1281         int rc;
1282
1283         /*
1284          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1285          */
1286         if (dump_payload) {
1287                 u32 length = min(cmd->se_cmd.data_length - cmd->write_data_done,
1288                                  cmd->first_burst_len);
1289
1290                 pr_debug("Dumping min(%d - %d, %d) = %d bytes of immediate data\n",
1291                          cmd->se_cmd.data_length, cmd->write_data_done,
1292                          cmd->first_burst_len, length);
1293                 rc = iscsit_dump_data_payload(cmd->conn, length, 1);
1294                 pr_debug("Finished dumping immediate data\n");
1295                 if (rc < 0)
1296                         immed_ret = IMMEDIATE_DATA_CANNOT_RECOVER;
1297         } else {
1298                 immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1299                                                          cmd->first_burst_len);
1300         }
1301
1302         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1303                 /*
1304                  * A PDU/CmdSN carrying Immediate Data passed
1305                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1306                  * Immediate Bit is not set.
1307                  */
1308                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1309                                         (unsigned char *)hdr, hdr->cmdsn);
1310                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1311                         return -1;
1312
1313                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1314                         target_put_sess_cmd(&cmd->se_cmd);
1315
1316                         return 0;
1317                 } else if (cmd->unsolicited_data)
1318                         iscsit_set_unsolicited_dataout(cmd);
1319
1320         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1321                 /*
1322                  * Immediate Data failed DataCRC and ERL>=1,
1323                  * silently drop this PDU and let the initiator
1324                  * plug the CmdSN gap.
1325                  *
1326                  * FIXME: Send Unsolicited NOPIN with reserved
1327                  * TTT here to help the initiator figure out
1328                  * the missing CmdSN, although they should be
1329                  * intelligent enough to determine the missing
1330                  * CmdSN and issue a retry to plug the sequence.
1331                  */
1332                 cmd->i_state = ISTATE_REMOVE;
1333                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1334         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1335                 return -1;
1336
1337         return 0;
1338 }
1339
1340 static int
1341 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1342                            unsigned char *buf)
1343 {
1344         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1345         int rc, immed_data;
1346         bool dump_payload = false;
1347
1348         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1349         if (rc < 0)
1350                 return 0;
1351         /*
1352          * Allocation iovecs needed for struct socket operations for
1353          * traditional iSCSI block I/O.
1354          */
1355         if (iscsit_allocate_iovecs(cmd) < 0) {
1356                 return iscsit_reject_cmd(cmd,
1357                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1358         }
1359         immed_data = cmd->immediate_data;
1360
1361         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1362         if (rc < 0)
1363                 return rc;
1364         else if (rc > 0)
1365                 dump_payload = true;
1366
1367         if (!immed_data)
1368                 return 0;
1369
1370         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1371 }
1372
1373 static u32 iscsit_do_crypto_hash_sg(
1374         struct ahash_request *hash,
1375         struct iscsi_cmd *cmd,
1376         u32 data_offset,
1377         u32 data_length,
1378         u32 padding,
1379         u8 *pad_bytes)
1380 {
1381         u32 data_crc;
1382         struct scatterlist *sg;
1383         unsigned int page_off;
1384
1385         crypto_ahash_init(hash);
1386
1387         sg = cmd->first_data_sg;
1388         page_off = cmd->first_data_sg_off;
1389
1390         if (data_length && page_off) {
1391                 struct scatterlist first_sg;
1392                 u32 len = min_t(u32, data_length, sg->length - page_off);
1393
1394                 sg_init_table(&first_sg, 1);
1395                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1396
1397                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1398                 crypto_ahash_update(hash);
1399
1400                 data_length -= len;
1401                 sg = sg_next(sg);
1402         }
1403
1404         while (data_length) {
1405                 u32 cur_len = min_t(u32, data_length, sg->length);
1406
1407                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1408                 crypto_ahash_update(hash);
1409
1410                 data_length -= cur_len;
1411                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1412                 sg = sg_next(sg);
1413         }
1414
1415         if (padding) {
1416                 struct scatterlist pad_sg;
1417
1418                 sg_init_one(&pad_sg, pad_bytes, padding);
1419                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1420                                         padding);
1421                 crypto_ahash_finup(hash);
1422         } else {
1423                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1424                 crypto_ahash_final(hash);
1425         }
1426
1427         return data_crc;
1428 }
1429
1430 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1431         const void *buf, u32 payload_length, u32 padding,
1432         const void *pad_bytes, void *data_crc)
1433 {
1434         struct scatterlist sg[2];
1435
1436         sg_init_table(sg, ARRAY_SIZE(sg));
1437         sg_set_buf(sg, buf, payload_length);
1438         if (padding)
1439                 sg_set_buf(sg + 1, pad_bytes, padding);
1440
1441         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1442
1443         crypto_ahash_digest(hash);
1444 }
1445
1446 int
1447 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1448                            struct iscsi_cmd *cmd, u32 payload_length,
1449                            bool *success)
1450 {
1451         struct iscsi_data *hdr = buf;
1452         struct se_cmd *se_cmd;
1453         int rc;
1454
1455         /* iSCSI write */
1456         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1457
1458         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1459                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1460                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1461                 payload_length, conn->cid);
1462
1463         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1464                 pr_err("Command ITT: 0x%08x received DataOUT after"
1465                         " last DataOUT received, dumping payload\n",
1466                         cmd->init_task_tag);
1467                 return iscsit_dump_data_payload(conn, payload_length, 1);
1468         }
1469
1470         if (cmd->data_direction != DMA_TO_DEVICE) {
1471                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1472                         " NON-WRITE command.\n", cmd->init_task_tag);
1473                 return iscsit_dump_data_payload(conn, payload_length, 1);
1474         }
1475         se_cmd = &cmd->se_cmd;
1476         iscsit_mod_dataout_timer(cmd);
1477
1478         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1479                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1480                        be32_to_cpu(hdr->offset), payload_length,
1481                        cmd->se_cmd.data_length);
1482                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1483         }
1484
1485         if (cmd->unsolicited_data) {
1486                 int dump_unsolicited_data = 0;
1487
1488                 if (conn->sess->sess_ops->InitialR2T) {
1489                         pr_err("Received unexpected unsolicited data"
1490                                 " while InitialR2T=Yes, protocol error.\n");
1491                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1492                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1493                         return -1;
1494                 }
1495                 /*
1496                  * Special case for dealing with Unsolicited DataOUT
1497                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1498                  * failures;
1499                  */
1500
1501                 /* Something's amiss if we're not in WRITE_PENDING state... */
1502                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1503                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1504                         dump_unsolicited_data = 1;
1505
1506                 if (dump_unsolicited_data) {
1507                         /*
1508                          * Check if a delayed TASK_ABORTED status needs to
1509                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1510                          * received with the unsolicited data out.
1511                          */
1512                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1513                                 iscsit_stop_dataout_timer(cmd);
1514
1515                         return iscsit_dump_data_payload(conn, payload_length, 1);
1516                 }
1517         } else {
1518                 /*
1519                  * For the normal solicited data path:
1520                  *
1521                  * Check for a delayed TASK_ABORTED status and dump any
1522                  * incoming data out payload if one exists.  Also, when the
1523                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1524                  * data out sequence, we decrement outstanding_r2ts.  Once
1525                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1526                  * TASK_ABORTED status.
1527                  */
1528                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1529                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL &&
1530                             --cmd->outstanding_r2ts < 1)
1531                                 iscsit_stop_dataout_timer(cmd);
1532
1533                         return iscsit_dump_data_payload(conn, payload_length, 1);
1534                 }
1535         }
1536         /*
1537          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1538          * within-command recovery checks before receiving the payload.
1539          */
1540         rc = iscsit_check_pre_dataout(cmd, buf);
1541         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1542                 return 0;
1543         else if (rc == DATAOUT_CANNOT_RECOVER)
1544                 return -1;
1545         *success = true;
1546         return 0;
1547 }
1548 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1549
1550 int
1551 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1552                          struct iscsi_cmd **out_cmd)
1553 {
1554         struct iscsi_data *hdr = buf;
1555         struct iscsi_cmd *cmd;
1556         u32 payload_length = ntoh24(hdr->dlength);
1557         int rc;
1558         bool success = false;
1559
1560         if (!payload_length) {
1561                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1562                 return 0;
1563         }
1564
1565         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1566                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1567                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1568                         conn->conn_ops->MaxXmitDataSegmentLength);
1569                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1570         }
1571
1572         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1573         if (!cmd)
1574                 return 0;
1575
1576         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1577
1578         if (success)
1579                 *out_cmd = cmd;
1580
1581         return rc;
1582 }
1583 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1584
1585 static int
1586 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1587                    struct iscsi_data *hdr)
1588 {
1589         struct kvec *iov;
1590         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1591         u32 payload_length;
1592         int iov_ret, data_crc_failed = 0;
1593
1594         payload_length = min_t(u32, cmd->se_cmd.data_length,
1595                                ntoh24(hdr->dlength));
1596         rx_size += payload_length;
1597         iov = &cmd->iov_data[0];
1598
1599         iov_ret = iscsit_map_iovec(cmd, iov, cmd->orig_iov_data_count - 2,
1600                                    be32_to_cpu(hdr->offset), payload_length);
1601         if (iov_ret < 0)
1602                 return -1;
1603
1604         iov_count += iov_ret;
1605
1606         padding = ((-payload_length) & 3);
1607         if (padding != 0) {
1608                 iov[iov_count].iov_base = cmd->pad_bytes;
1609                 iov[iov_count++].iov_len = padding;
1610                 rx_size += padding;
1611                 pr_debug("Receiving %u padding bytes.\n", padding);
1612         }
1613
1614         if (conn->conn_ops->DataDigest) {
1615                 iov[iov_count].iov_base = &checksum;
1616                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1617                 rx_size += ISCSI_CRC_LEN;
1618         }
1619
1620         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
1621         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1622
1623         iscsit_unmap_iovec(cmd);
1624
1625         if (rx_got != rx_size)
1626                 return -1;
1627
1628         if (conn->conn_ops->DataDigest) {
1629                 u32 data_crc;
1630
1631                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1632                                                     be32_to_cpu(hdr->offset),
1633                                                     payload_length, padding,
1634                                                     cmd->pad_bytes);
1635
1636                 if (checksum != data_crc) {
1637                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1638                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1639                                 " does not match computed 0x%08x\n",
1640                                 hdr->itt, hdr->offset, payload_length,
1641                                 hdr->datasn, checksum, data_crc);
1642                         data_crc_failed = 1;
1643                 } else {
1644                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1645                                 " %u bytes of Data Out\n", checksum,
1646                                 payload_length);
1647                 }
1648         }
1649
1650         return data_crc_failed;
1651 }
1652
1653 int
1654 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1655                              bool data_crc_failed)
1656 {
1657         struct iscsi_conn *conn = cmd->conn;
1658         int rc, ooo_cmdsn;
1659         /*
1660          * Increment post receive data and CRC values or perform
1661          * within-command recovery.
1662          */
1663         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1664         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1665                 return 0;
1666         else if (rc == DATAOUT_SEND_R2T) {
1667                 iscsit_set_dataout_sequence_values(cmd);
1668                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1669         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1670                 /*
1671                  * Handle extra special case for out of order
1672                  * Unsolicited Data Out.
1673                  */
1674                 spin_lock_bh(&cmd->istate_lock);
1675                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1676                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1677                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1678                 spin_unlock_bh(&cmd->istate_lock);
1679
1680                 iscsit_stop_dataout_timer(cmd);
1681                 if (ooo_cmdsn)
1682                         return 0;
1683                 target_execute_cmd(&cmd->se_cmd);
1684                 return 0;
1685         } else /* DATAOUT_CANNOT_RECOVER */
1686                 return -1;
1687
1688         return 0;
1689 }
1690 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1691
1692 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1693 {
1694         struct iscsi_cmd *cmd = NULL;
1695         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1696         int rc;
1697         bool data_crc_failed = false;
1698
1699         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1700         if (rc < 0)
1701                 return 0;
1702         else if (!cmd)
1703                 return 0;
1704
1705         rc = iscsit_get_dataout(conn, cmd, hdr);
1706         if (rc < 0)
1707                 return rc;
1708         else if (rc > 0)
1709                 data_crc_failed = true;
1710
1711         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1712 }
1713
1714 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1715                          struct iscsi_nopout *hdr)
1716 {
1717         u32 payload_length = ntoh24(hdr->dlength);
1718
1719         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1720                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1721                 if (!cmd)
1722                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1723                                                  (unsigned char *)hdr);
1724
1725                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1726                                          (unsigned char *)hdr);
1727         }
1728
1729         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1730                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1731                         " not set, protocol error.\n");
1732                 if (!cmd)
1733                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1734                                                  (unsigned char *)hdr);
1735
1736                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1737                                          (unsigned char *)hdr);
1738         }
1739
1740         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1741                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1742                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1743                         " error.\n", payload_length,
1744                         conn->conn_ops->MaxXmitDataSegmentLength);
1745                 if (!cmd)
1746                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1747                                                  (unsigned char *)hdr);
1748
1749                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1750                                          (unsigned char *)hdr);
1751         }
1752
1753         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1754                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1755                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1756                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1757                 payload_length);
1758         /*
1759          * This is not a response to a Unsolicited NopIN, which means
1760          * it can either be a NOPOUT ping request (with a valid ITT),
1761          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1762          * Either way, make sure we allocate an struct iscsi_cmd, as both
1763          * can contain ping data.
1764          */
1765         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1766                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1767                 cmd->i_state            = ISTATE_SEND_NOPIN;
1768                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1769                                                 1 : 0);
1770                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1771                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1772                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1773                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1774                 cmd->data_direction     = DMA_NONE;
1775         }
1776
1777         return 0;
1778 }
1779 EXPORT_SYMBOL(iscsit_setup_nop_out);
1780
1781 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1782                            struct iscsi_nopout *hdr)
1783 {
1784         struct iscsi_cmd *cmd_p = NULL;
1785         int cmdsn_ret = 0;
1786         /*
1787          * Initiator is expecting a NopIN ping reply..
1788          */
1789         if (hdr->itt != RESERVED_ITT) {
1790                 if (!cmd)
1791                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1792                                                 (unsigned char *)hdr);
1793
1794                 spin_lock_bh(&conn->cmd_lock);
1795                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1796                 spin_unlock_bh(&conn->cmd_lock);
1797
1798                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1799
1800                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1801                         iscsit_add_cmd_to_response_queue(cmd, conn,
1802                                                          cmd->i_state);
1803                         return 0;
1804                 }
1805
1806                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1807                                 (unsigned char *)hdr, hdr->cmdsn);
1808                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1809                         return 0;
1810                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1811                         return -1;
1812
1813                 return 0;
1814         }
1815         /*
1816          * This was a response to a unsolicited NOPIN ping.
1817          */
1818         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1819                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1820                 if (!cmd_p)
1821                         return -EINVAL;
1822
1823                 iscsit_stop_nopin_response_timer(conn);
1824
1825                 cmd_p->i_state = ISTATE_REMOVE;
1826                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1827
1828                 iscsit_start_nopin_timer(conn);
1829                 return 0;
1830         }
1831         /*
1832          * Otherwise, initiator is not expecting a NOPIN is response.
1833          * Just ignore for now.
1834          */
1835
1836         if (cmd)
1837                 iscsit_free_cmd(cmd, false);
1838
1839         return 0;
1840 }
1841 EXPORT_SYMBOL(iscsit_process_nop_out);
1842
1843 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1844                                  unsigned char *buf)
1845 {
1846         unsigned char *ping_data = NULL;
1847         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1848         struct kvec *iov = NULL;
1849         u32 payload_length = ntoh24(hdr->dlength);
1850         int ret;
1851
1852         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1853         if (ret < 0)
1854                 return 0;
1855         /*
1856          * Handle NOP-OUT payload for traditional iSCSI sockets
1857          */
1858         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1859                 u32 checksum, data_crc, padding = 0;
1860                 int niov = 0, rx_got, rx_size = payload_length;
1861
1862                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1863                 if (!ping_data) {
1864                         ret = -1;
1865                         goto out;
1866                 }
1867
1868                 iov = &cmd->iov_misc[0];
1869                 iov[niov].iov_base      = ping_data;
1870                 iov[niov++].iov_len     = payload_length;
1871
1872                 padding = ((-payload_length) & 3);
1873                 if (padding != 0) {
1874                         pr_debug("Receiving %u additional bytes"
1875                                 " for padding.\n", padding);
1876                         iov[niov].iov_base      = &cmd->pad_bytes;
1877                         iov[niov++].iov_len     = padding;
1878                         rx_size += padding;
1879                 }
1880                 if (conn->conn_ops->DataDigest) {
1881                         iov[niov].iov_base      = &checksum;
1882                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1883                         rx_size += ISCSI_CRC_LEN;
1884                 }
1885
1886                 WARN_ON_ONCE(niov > ARRAY_SIZE(cmd->iov_misc));
1887                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1888                 if (rx_got != rx_size) {
1889                         ret = -1;
1890                         goto out;
1891                 }
1892
1893                 if (conn->conn_ops->DataDigest) {
1894                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1895                                                   payload_length, padding,
1896                                                   cmd->pad_bytes, &data_crc);
1897
1898                         if (checksum != data_crc) {
1899                                 pr_err("Ping data CRC32C DataDigest"
1900                                 " 0x%08x does not match computed 0x%08x\n",
1901                                         checksum, data_crc);
1902                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1903                                         pr_err("Unable to recover from"
1904                                         " NOPOUT Ping DataCRC failure while in"
1905                                                 " ERL=0.\n");
1906                                         ret = -1;
1907                                         goto out;
1908                                 } else {
1909                                         /*
1910                                          * Silently drop this PDU and let the
1911                                          * initiator plug the CmdSN gap.
1912                                          */
1913                                         pr_debug("Dropping NOPOUT"
1914                                         " Command CmdSN: 0x%08x due to"
1915                                         " DataCRC error.\n", hdr->cmdsn);
1916                                         ret = 0;
1917                                         goto out;
1918                                 }
1919                         } else {
1920                                 pr_debug("Got CRC32C DataDigest"
1921                                 " 0x%08x for %u bytes of ping data.\n",
1922                                         checksum, payload_length);
1923                         }
1924                 }
1925
1926                 ping_data[payload_length] = '\0';
1927                 /*
1928                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1929                  */
1930                 cmd->buf_ptr = ping_data;
1931                 cmd->buf_ptr_size = payload_length;
1932
1933                 pr_debug("Got %u bytes of NOPOUT ping"
1934                         " data.\n", payload_length);
1935                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1936         }
1937
1938         return iscsit_process_nop_out(conn, cmd, hdr);
1939 out:
1940         if (cmd)
1941                 iscsit_free_cmd(cmd, false);
1942
1943         kfree(ping_data);
1944         return ret;
1945 }
1946
1947 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1948 {
1949         switch (iscsi_tmf) {
1950         case ISCSI_TM_FUNC_ABORT_TASK:
1951                 return TMR_ABORT_TASK;
1952         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1953                 return TMR_ABORT_TASK_SET;
1954         case ISCSI_TM_FUNC_CLEAR_ACA:
1955                 return TMR_CLEAR_ACA;
1956         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1957                 return TMR_CLEAR_TASK_SET;
1958         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1959                 return TMR_LUN_RESET;
1960         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1961                 return TMR_TARGET_WARM_RESET;
1962         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1963                 return TMR_TARGET_COLD_RESET;
1964         default:
1965                 return TMR_UNKNOWN;
1966         }
1967 }
1968
1969 int
1970 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1971                            unsigned char *buf)
1972 {
1973         struct se_tmr_req *se_tmr;
1974         struct iscsi_tmr_req *tmr_req;
1975         struct iscsi_tm *hdr;
1976         int out_of_order_cmdsn = 0, ret;
1977         u8 function, tcm_function = TMR_UNKNOWN;
1978
1979         hdr                     = (struct iscsi_tm *) buf;
1980         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1981         function = hdr->flags;
1982
1983         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1984                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1985                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1986                 hdr->rtt, hdr->refcmdsn, conn->cid);
1987
1988         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1989             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1990              hdr->rtt != RESERVED_ITT)) {
1991                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1992                 hdr->rtt = RESERVED_ITT;
1993         }
1994
1995         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1996                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1997                 pr_err("Task Management Request TASK_REASSIGN not"
1998                         " issued as immediate command, bad iSCSI Initiator"
1999                                 "implementation\n");
2000                 return iscsit_add_reject_cmd(cmd,
2001                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
2002         }
2003         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
2004             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
2005                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
2006
2007         cmd->data_direction = DMA_NONE;
2008         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2009         if (!cmd->tmr_req) {
2010                 return iscsit_add_reject_cmd(cmd,
2011                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2012                                              buf);
2013         }
2014
2015         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2016                               conn->sess->se_sess, 0, DMA_NONE,
2017                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
2018                               scsilun_to_int(&hdr->lun));
2019
2020         target_get_sess_cmd(&cmd->se_cmd, true);
2021
2022         /*
2023          * TASK_REASSIGN for ERL=2 / connection stays inside of
2024          * LIO-Target $FABRIC_MOD
2025          */
2026         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2027                 tcm_function = iscsit_convert_tmf(function);
2028                 if (tcm_function == TMR_UNKNOWN) {
2029                         pr_err("Unknown iSCSI TMR Function:"
2030                                " 0x%02x\n", function);
2031                         return iscsit_add_reject_cmd(cmd,
2032                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2033                 }
2034         }
2035         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2036                                  GFP_KERNEL);
2037         if (ret < 0)
2038                 return iscsit_add_reject_cmd(cmd,
2039                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2040
2041         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2042
2043         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2044         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2045         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2046         cmd->init_task_tag      = hdr->itt;
2047         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2048         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2049         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2050         se_tmr                  = cmd->se_cmd.se_tmr_req;
2051         tmr_req                 = cmd->tmr_req;
2052         /*
2053          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2054          */
2055         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2056                 ret = transport_lookup_tmr_lun(&cmd->se_cmd);
2057                 if (ret < 0) {
2058                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2059                         goto attach;
2060                 }
2061         }
2062
2063         switch (function) {
2064         case ISCSI_TM_FUNC_ABORT_TASK:
2065                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2066                 if (se_tmr->response)
2067                         goto attach;
2068                 break;
2069         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2070         case ISCSI_TM_FUNC_CLEAR_ACA:
2071         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2072         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2073                 break;
2074         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2075                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2076                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2077                         goto attach;
2078                 }
2079                 break;
2080         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2081                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2082                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2083                         goto attach;
2084                 }
2085                 break;
2086         case ISCSI_TM_FUNC_TASK_REASSIGN:
2087                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2088                 /*
2089                  * Perform sanity checks on the ExpDataSN only if the
2090                  * TASK_REASSIGN was successful.
2091                  */
2092                 if (se_tmr->response)
2093                         break;
2094
2095                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2096                         return iscsit_add_reject_cmd(cmd,
2097                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2098                 break;
2099         default:
2100                 pr_err("Unknown TMR function: 0x%02x, protocol"
2101                         " error.\n", function);
2102                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2103                 goto attach;
2104         }
2105
2106         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2107             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2108                 se_tmr->call_transport = 1;
2109 attach:
2110         spin_lock_bh(&conn->cmd_lock);
2111         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2112         spin_unlock_bh(&conn->cmd_lock);
2113
2114         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2115                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2116                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2117                         out_of_order_cmdsn = 1;
2118                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2119                         target_put_sess_cmd(&cmd->se_cmd);
2120                         return 0;
2121                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2122                         return -1;
2123                 }
2124         }
2125         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2126
2127         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2128                 return 0;
2129         /*
2130          * Found the referenced task, send to transport for processing.
2131          */
2132         if (se_tmr->call_transport)
2133                 return transport_generic_handle_tmr(&cmd->se_cmd);
2134
2135         /*
2136          * Could not find the referenced LUN, task, or Task Management
2137          * command not authorized or supported.  Change state and
2138          * let the tx_thread send the response.
2139          *
2140          * For connection recovery, this is also the default action for
2141          * TMR TASK_REASSIGN.
2142          */
2143         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2144         target_put_sess_cmd(&cmd->se_cmd);
2145         return 0;
2146 }
2147 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2148
2149 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2150 int
2151 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2152                       struct iscsi_text *hdr)
2153 {
2154         u32 payload_length = ntoh24(hdr->dlength);
2155
2156         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2157                 pr_err("Unable to accept text parameter length: %u"
2158                         "greater than MaxXmitDataSegmentLength %u.\n",
2159                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2160                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2161                                          (unsigned char *)hdr);
2162         }
2163
2164         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2165              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2166                 pr_err("Multi sequence text commands currently not supported\n");
2167                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2168                                         (unsigned char *)hdr);
2169         }
2170
2171         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2172                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2173                 hdr->exp_statsn, payload_length);
2174
2175         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2176         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2177         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2178         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2179         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2180         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2181         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2182         cmd->data_direction     = DMA_NONE;
2183         kfree(cmd->text_in_ptr);
2184         cmd->text_in_ptr        = NULL;
2185
2186         return 0;
2187 }
2188 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2189
2190 int
2191 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2192                         struct iscsi_text *hdr)
2193 {
2194         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2195         int cmdsn_ret;
2196
2197         if (!text_in) {
2198                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2199                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2200                         pr_err("Unable to locate text_in buffer for sendtargets"
2201                                " discovery\n");
2202                         goto reject;
2203                 }
2204                 goto empty_sendtargets;
2205         }
2206         if (strncmp("SendTargets=", text_in, 12) != 0) {
2207                 pr_err("Received Text Data that is not"
2208                         " SendTargets, cannot continue.\n");
2209                 goto reject;
2210         }
2211         /* '=' confirmed in strncmp */
2212         text_ptr = strchr(text_in, '=');
2213         BUG_ON(!text_ptr);
2214         if (!strncmp("=All", text_ptr, 5)) {
2215                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2216         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2217                    !strncmp("=eui.", text_ptr, 5)) {
2218                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2219         } else {
2220                 pr_err("Unable to locate valid SendTargets%s value\n",
2221                        text_ptr);
2222                 goto reject;
2223         }
2224
2225         spin_lock_bh(&conn->cmd_lock);
2226         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2227         spin_unlock_bh(&conn->cmd_lock);
2228
2229 empty_sendtargets:
2230         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2231
2232         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2233                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2234                                 (unsigned char *)hdr, hdr->cmdsn);
2235                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2236                         return -1;
2237
2238                 return 0;
2239         }
2240
2241         return iscsit_execute_cmd(cmd, 0);
2242
2243 reject:
2244         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2245                                  (unsigned char *)hdr);
2246 }
2247 EXPORT_SYMBOL(iscsit_process_text_cmd);
2248
2249 static int
2250 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2251                        unsigned char *buf)
2252 {
2253         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2254         char *text_in = NULL;
2255         u32 payload_length = ntoh24(hdr->dlength);
2256         int rx_size, rc;
2257
2258         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2259         if (rc < 0)
2260                 return 0;
2261
2262         rx_size = payload_length;
2263         if (payload_length) {
2264                 u32 checksum = 0, data_crc = 0;
2265                 u32 padding = 0;
2266                 int niov = 0, rx_got;
2267                 struct kvec iov[2];
2268
2269                 rx_size = ALIGN(payload_length, 4);
2270                 text_in = kzalloc(rx_size, GFP_KERNEL);
2271                 if (!text_in)
2272                         goto reject;
2273
2274                 cmd->text_in_ptr = text_in;
2275
2276                 memset(iov, 0, sizeof(iov));
2277                 iov[niov].iov_base      = text_in;
2278                 iov[niov++].iov_len     = rx_size;
2279
2280                 padding = rx_size - payload_length;
2281                 if (padding)
2282                         pr_debug("Receiving %u additional bytes"
2283                                         " for padding.\n", padding);
2284                 if (conn->conn_ops->DataDigest) {
2285                         iov[niov].iov_base      = &checksum;
2286                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2287                         rx_size += ISCSI_CRC_LEN;
2288                 }
2289
2290                 WARN_ON_ONCE(niov > ARRAY_SIZE(iov));
2291                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2292                 if (rx_got != rx_size)
2293                         goto reject;
2294
2295                 if (conn->conn_ops->DataDigest) {
2296                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2297                                                   text_in, rx_size, 0, NULL,
2298                                                   &data_crc);
2299
2300                         if (checksum != data_crc) {
2301                                 pr_err("Text data CRC32C DataDigest"
2302                                         " 0x%08x does not match computed"
2303                                         " 0x%08x\n", checksum, data_crc);
2304                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2305                                         pr_err("Unable to recover from"
2306                                         " Text Data digest failure while in"
2307                                                 " ERL=0.\n");
2308                                         goto reject;
2309                                 } else {
2310                                         /*
2311                                          * Silently drop this PDU and let the
2312                                          * initiator plug the CmdSN gap.
2313                                          */
2314                                         pr_debug("Dropping Text"
2315                                         " Command CmdSN: 0x%08x due to"
2316                                         " DataCRC error.\n", hdr->cmdsn);
2317                                         kfree(text_in);
2318                                         return 0;
2319                                 }
2320                         } else {
2321                                 pr_debug("Got CRC32C DataDigest"
2322                                         " 0x%08x for %u bytes of text data.\n",
2323                                                 checksum, payload_length);
2324                         }
2325                 }
2326                 text_in[payload_length - 1] = '\0';
2327                 pr_debug("Successfully read %d bytes of text"
2328                                 " data.\n", payload_length);
2329         }
2330
2331         return iscsit_process_text_cmd(conn, cmd, hdr);
2332
2333 reject:
2334         kfree(cmd->text_in_ptr);
2335         cmd->text_in_ptr = NULL;
2336         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2337 }
2338
2339 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2340 {
2341         struct iscsi_conn *conn_p;
2342         struct iscsi_session *sess = conn->sess;
2343
2344         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2345                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2346
2347         atomic_set(&sess->session_logout, 1);
2348         atomic_set(&conn->conn_logout_remove, 1);
2349         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2350
2351         iscsit_inc_conn_usage_count(conn);
2352         iscsit_inc_session_usage_count(sess);
2353
2354         spin_lock_bh(&sess->conn_lock);
2355         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2356                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2357                         continue;
2358
2359                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2360                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2361         }
2362         spin_unlock_bh(&sess->conn_lock);
2363
2364         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2365
2366         return 0;
2367 }
2368
2369 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2370 {
2371         struct iscsi_conn *l_conn;
2372         struct iscsi_session *sess = conn->sess;
2373
2374         pr_debug("Received logout request CLOSECONNECTION for CID:"
2375                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2376
2377         /*
2378          * A Logout Request with a CLOSECONNECTION reason code for a CID
2379          * can arrive on a connection with a differing CID.
2380          */
2381         if (conn->cid == cmd->logout_cid) {
2382                 spin_lock_bh(&conn->state_lock);
2383                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2384                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2385
2386                 atomic_set(&conn->conn_logout_remove, 1);
2387                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2388                 iscsit_inc_conn_usage_count(conn);
2389
2390                 spin_unlock_bh(&conn->state_lock);
2391         } else {
2392                 /*
2393                  * Handle all different cid CLOSECONNECTION requests in
2394                  * iscsit_logout_post_handler_diffcid() as to give enough
2395                  * time for any non immediate command's CmdSN to be
2396                  * acknowledged on the connection in question.
2397                  *
2398                  * Here we simply make sure the CID is still around.
2399                  */
2400                 l_conn = iscsit_get_conn_from_cid(sess,
2401                                 cmd->logout_cid);
2402                 if (!l_conn) {
2403                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2404                         iscsit_add_cmd_to_response_queue(cmd, conn,
2405                                         cmd->i_state);
2406                         return 0;
2407                 }
2408
2409                 iscsit_dec_conn_usage_count(l_conn);
2410         }
2411
2412         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2413
2414         return 0;
2415 }
2416
2417 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2418 {
2419         struct iscsi_session *sess = conn->sess;
2420
2421         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2422                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2423
2424         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2425                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2426                         " while ERL!=2.\n");
2427                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2428                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429                 return 0;
2430         }
2431
2432         if (conn->cid == cmd->logout_cid) {
2433                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2434                         " with CID: %hu on CID: %hu, implementation error.\n",
2435                                 cmd->logout_cid, conn->cid);
2436                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2437                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2438                 return 0;
2439         }
2440
2441         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2442
2443         return 0;
2444 }
2445
2446 int
2447 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2448                         unsigned char *buf)
2449 {
2450         int cmdsn_ret, logout_remove = 0;
2451         u8 reason_code = 0;
2452         struct iscsi_logout *hdr;
2453         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2454
2455         hdr                     = (struct iscsi_logout *) buf;
2456         reason_code             = (hdr->flags & 0x7f);
2457
2458         if (tiqn) {
2459                 spin_lock(&tiqn->logout_stats.lock);
2460                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2461                         tiqn->logout_stats.normal_logouts++;
2462                 else
2463                         tiqn->logout_stats.abnormal_logouts++;
2464                 spin_unlock(&tiqn->logout_stats.lock);
2465         }
2466
2467         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2468                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2469                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2470                 hdr->cid, conn->cid);
2471
2472         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2473                 pr_err("Received logout request on connection that"
2474                         " is not in logged in state, ignoring request.\n");
2475                 iscsit_free_cmd(cmd, false);
2476                 return 0;
2477         }
2478
2479         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2480         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2481         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2482         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2483         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2484         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2485         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2486         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2487         cmd->logout_reason      = reason_code;
2488         cmd->data_direction     = DMA_NONE;
2489
2490         /*
2491          * We need to sleep in these cases (by returning 1) until the Logout
2492          * Response gets sent in the tx thread.
2493          */
2494         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2495            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2496             be16_to_cpu(hdr->cid) == conn->cid))
2497                 logout_remove = 1;
2498
2499         spin_lock_bh(&conn->cmd_lock);
2500         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2501         spin_unlock_bh(&conn->cmd_lock);
2502
2503         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2504                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2505
2506         /*
2507          * Immediate commands are executed, well, immediately.
2508          * Non-Immediate Logout Commands are executed in CmdSN order.
2509          */
2510         if (cmd->immediate_cmd) {
2511                 int ret = iscsit_execute_cmd(cmd, 0);
2512
2513                 if (ret < 0)
2514                         return ret;
2515         } else {
2516                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2517                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2518                         logout_remove = 0;
2519                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2520                         return -1;
2521         }
2522
2523         return logout_remove;
2524 }
2525 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2526
2527 int iscsit_handle_snack(
2528         struct iscsi_conn *conn,
2529         unsigned char *buf)
2530 {
2531         struct iscsi_snack *hdr;
2532
2533         hdr                     = (struct iscsi_snack *) buf;
2534         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2535
2536         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2537                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2538                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2539                         hdr->begrun, hdr->runlength, conn->cid);
2540
2541         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2542                 pr_err("Initiator sent SNACK request while in"
2543                         " ErrorRecoveryLevel=0.\n");
2544                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2545                                          buf);
2546         }
2547         /*
2548          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2549          * call from inside iscsi_send_recovery_datain_or_r2t().
2550          */
2551         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2552         case 0:
2553                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2554                         hdr->itt,
2555                         be32_to_cpu(hdr->ttt),
2556                         be32_to_cpu(hdr->begrun),
2557                         be32_to_cpu(hdr->runlength));
2558         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2559                 return iscsit_handle_status_snack(conn, hdr->itt,
2560                         be32_to_cpu(hdr->ttt),
2561                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2562         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2563                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2564                         be32_to_cpu(hdr->begrun),
2565                         be32_to_cpu(hdr->runlength));
2566         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2567                 /* FIXME: Support R-Data SNACK */
2568                 pr_err("R-Data SNACK Not Supported.\n");
2569                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2570                                          buf);
2571         default:
2572                 pr_err("Unknown SNACK type 0x%02x, protocol"
2573                         " error.\n", hdr->flags & 0x0f);
2574                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2575                                          buf);
2576         }
2577
2578         return 0;
2579 }
2580 EXPORT_SYMBOL(iscsit_handle_snack);
2581
2582 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2583 {
2584         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2585             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2586                 wait_for_completion_interruptible_timeout(
2587                                         &conn->rx_half_close_comp,
2588                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2589         }
2590 }
2591
2592 static int iscsit_handle_immediate_data(
2593         struct iscsi_cmd *cmd,
2594         struct iscsi_scsi_req *hdr,
2595         u32 length)
2596 {
2597         int iov_ret, rx_got = 0, rx_size = 0;
2598         u32 checksum, iov_count = 0, padding = 0;
2599         struct iscsi_conn *conn = cmd->conn;
2600         struct kvec *iov;
2601         void *overflow_buf = NULL;
2602
2603         BUG_ON(cmd->write_data_done > cmd->se_cmd.data_length);
2604         rx_size = min(cmd->se_cmd.data_length - cmd->write_data_done, length);
2605         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data,
2606                                    cmd->orig_iov_data_count - 2,
2607                                    cmd->write_data_done, rx_size);
2608         if (iov_ret < 0)
2609                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2610
2611         iov_count = iov_ret;
2612         iov = &cmd->iov_data[0];
2613         if (rx_size < length) {
2614                 /*
2615                  * Special case: length of immediate data exceeds the data
2616                  * buffer size derived from the CDB.
2617                  */
2618                 overflow_buf = kmalloc(length - rx_size, GFP_KERNEL);
2619                 if (!overflow_buf) {
2620                         iscsit_unmap_iovec(cmd);
2621                         return IMMEDIATE_DATA_CANNOT_RECOVER;
2622                 }
2623                 cmd->overflow_buf = overflow_buf;
2624                 iov[iov_count].iov_base = overflow_buf;
2625                 iov[iov_count].iov_len = length - rx_size;
2626                 iov_count++;
2627                 rx_size = length;
2628         }
2629
2630         padding = ((-length) & 3);
2631         if (padding != 0) {
2632                 iov[iov_count].iov_base = cmd->pad_bytes;
2633                 iov[iov_count++].iov_len = padding;
2634                 rx_size += padding;
2635         }
2636
2637         if (conn->conn_ops->DataDigest) {
2638                 iov[iov_count].iov_base         = &checksum;
2639                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2640                 rx_size += ISCSI_CRC_LEN;
2641         }
2642
2643         WARN_ON_ONCE(iov_count > cmd->orig_iov_data_count);
2644         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2645
2646         iscsit_unmap_iovec(cmd);
2647
2648         if (rx_got != rx_size) {
2649                 iscsit_rx_thread_wait_for_tcp(conn);
2650                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2651         }
2652
2653         if (conn->conn_ops->DataDigest) {
2654                 u32 data_crc;
2655
2656                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2657                                                     cmd->write_data_done, length, padding,
2658                                                     cmd->pad_bytes);
2659
2660                 if (checksum != data_crc) {
2661                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2662                                 " does not match computed 0x%08x\n", checksum,
2663                                 data_crc);
2664
2665                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2666                                 pr_err("Unable to recover from"
2667                                         " Immediate Data digest failure while"
2668                                         " in ERL=0.\n");
2669                                 iscsit_reject_cmd(cmd,
2670                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2671                                                 (unsigned char *)hdr);
2672                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2673                         } else {
2674                                 iscsit_reject_cmd(cmd,
2675                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2676                                                 (unsigned char *)hdr);
2677                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2678                         }
2679                 } else {
2680                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2681                                 " %u bytes of Immediate Data\n", checksum,
2682                                 length);
2683                 }
2684         }
2685
2686         cmd->write_data_done += length;
2687
2688         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2689                 spin_lock_bh(&cmd->istate_lock);
2690                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2691                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2692                 spin_unlock_bh(&cmd->istate_lock);
2693         }
2694
2695         return IMMEDIATE_DATA_NORMAL_OPERATION;
2696 }
2697
2698 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2699         with active network interface */
2700 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2701 {
2702         struct iscsi_cmd *cmd;
2703         struct iscsi_conn *conn_p;
2704         bool found = false;
2705
2706         lockdep_assert_held(&conn->sess->conn_lock);
2707
2708         /*
2709          * Only send a Asynchronous Message on connections whos network
2710          * interface is still functional.
2711          */
2712         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2713                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2714                         iscsit_inc_conn_usage_count(conn_p);
2715                         found = true;
2716                         break;
2717                 }
2718         }
2719
2720         if (!found)
2721                 return;
2722
2723         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2724         if (!cmd) {
2725                 iscsit_dec_conn_usage_count(conn_p);
2726                 return;
2727         }
2728
2729         cmd->logout_cid = conn->cid;
2730         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2731         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2732
2733         spin_lock_bh(&conn_p->cmd_lock);
2734         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2735         spin_unlock_bh(&conn_p->cmd_lock);
2736
2737         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2738         iscsit_dec_conn_usage_count(conn_p);
2739 }
2740
2741 static int iscsit_send_conn_drop_async_message(
2742         struct iscsi_cmd *cmd,
2743         struct iscsi_conn *conn)
2744 {
2745         struct iscsi_async *hdr;
2746
2747         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2748
2749         hdr                     = (struct iscsi_async *) cmd->pdu;
2750         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2751         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2752         cmd->init_task_tag      = RESERVED_ITT;
2753         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2754         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2755         cmd->stat_sn            = conn->stat_sn++;
2756         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2757         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2758         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2759         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2760         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2761         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2762         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2763
2764         pr_debug("Sending Connection Dropped Async Message StatSN:"
2765                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2766                         cmd->logout_cid, conn->cid);
2767
2768         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2769 }
2770
2771 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2772 {
2773         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2774             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2775                 wait_for_completion_interruptible_timeout(
2776                                         &conn->tx_half_close_comp,
2777                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2778         }
2779 }
2780
2781 void
2782 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2783                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2784                         bool set_statsn)
2785 {
2786         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2787         hdr->flags              = datain->flags;
2788         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2789                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2790                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2791                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2792                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2793                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2794                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2795                 }
2796         }
2797         hton24(hdr->dlength, datain->length);
2798         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2799                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2800                                 (struct scsi_lun *)&hdr->lun);
2801         else
2802                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2803
2804         hdr->itt                = cmd->init_task_tag;
2805
2806         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2807                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2808         else
2809                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2810         if (set_statsn)
2811                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2812         else
2813                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2814
2815         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2816         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2817         hdr->datasn             = cpu_to_be32(datain->data_sn);
2818         hdr->offset             = cpu_to_be32(datain->offset);
2819
2820         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2821                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2822                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2823                 ntohl(hdr->offset), datain->length, conn->cid);
2824 }
2825 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2826
2827 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2828 {
2829         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2830         struct iscsi_datain datain;
2831         struct iscsi_datain_req *dr;
2832         int eodr = 0, ret;
2833         bool set_statsn = false;
2834
2835         memset(&datain, 0, sizeof(struct iscsi_datain));
2836         dr = iscsit_get_datain_values(cmd, &datain);
2837         if (!dr) {
2838                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2839                                 cmd->init_task_tag);
2840                 return -1;
2841         }
2842         /*
2843          * Be paranoid and double check the logic for now.
2844          */
2845         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2846                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2847                         " datain.length: %u exceeds cmd->data_length: %u\n",
2848                         cmd->init_task_tag, datain.offset, datain.length,
2849                         cmd->se_cmd.data_length);
2850                 return -1;
2851         }
2852
2853         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2854         /*
2855          * Special case for successfully execution w/ both DATAIN
2856          * and Sense Data.
2857          */
2858         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2859             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2860                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2861         else {
2862                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2863                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2864                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2865                         cmd->stat_sn = conn->stat_sn++;
2866                         set_statsn = true;
2867                 } else if (dr->dr_complete ==
2868                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2869                         set_statsn = true;
2870         }
2871
2872         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2873
2874         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2875         if (ret < 0)
2876                 return ret;
2877
2878         if (dr->dr_complete) {
2879                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2880                                 2 : 1;
2881                 iscsit_free_datain_req(cmd, dr);
2882         }
2883
2884         return eodr;
2885 }
2886
2887 int
2888 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2889                         struct iscsi_logout_rsp *hdr)
2890 {
2891         struct iscsi_conn *logout_conn = NULL;
2892         struct iscsi_conn_recovery *cr = NULL;
2893         struct iscsi_session *sess = conn->sess;
2894         /*
2895          * The actual shutting down of Sessions and/or Connections
2896          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2897          * is done in scsi_logout_post_handler().
2898          */
2899         switch (cmd->logout_reason) {
2900         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2901                 pr_debug("iSCSI session logout successful, setting"
2902                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2903                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2904                 break;
2905         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2906                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2907                         break;
2908                 /*
2909                  * For CLOSECONNECTION logout requests carrying
2910                  * a matching logout CID -> local CID, the reference
2911                  * for the local CID will have been incremented in
2912                  * iscsi_logout_closeconnection().
2913                  *
2914                  * For CLOSECONNECTION logout requests carrying
2915                  * a different CID than the connection it arrived
2916                  * on, the connection responding to cmd->logout_cid
2917                  * is stopped in iscsit_logout_post_handler_diffcid().
2918                  */
2919
2920                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2921                         " successful.\n", cmd->logout_cid, conn->cid);
2922                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2923                 break;
2924         case ISCSI_LOGOUT_REASON_RECOVERY:
2925                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2926                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2927                         break;
2928                 /*
2929                  * If the connection is still active from our point of view
2930                  * force connection recovery to occur.
2931                  */
2932                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2933                                 cmd->logout_cid);
2934                 if (logout_conn) {
2935                         iscsit_connection_reinstatement_rcfr(logout_conn);
2936                         iscsit_dec_conn_usage_count(logout_conn);
2937                 }
2938
2939                 cr = iscsit_get_inactive_connection_recovery_entry(
2940                                 conn->sess, cmd->logout_cid);
2941                 if (!cr) {
2942                         pr_err("Unable to locate CID: %hu for"
2943                         " REMOVECONNFORRECOVERY Logout Request.\n",
2944                                 cmd->logout_cid);
2945                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2946                         break;
2947                 }
2948
2949                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2950
2951                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2952                         " for recovery for CID: %hu on CID: %hu successful.\n",
2953                                 cmd->logout_cid, conn->cid);
2954                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2955                 break;
2956         default:
2957                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2958                                 cmd->logout_reason);
2959                 return -1;
2960         }
2961
2962         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2963         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2964         hdr->response           = cmd->logout_response;
2965         hdr->itt                = cmd->init_task_tag;
2966         cmd->stat_sn            = conn->stat_sn++;
2967         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2968
2969         iscsit_increment_maxcmdsn(cmd, conn->sess);
2970         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2971         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2972
2973         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2974                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2975                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2976                 cmd->logout_cid, conn->cid);
2977
2978         return 0;
2979 }
2980 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2981
2982 static int
2983 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2984 {
2985         int rc;
2986
2987         rc = iscsit_build_logout_rsp(cmd, conn,
2988                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2989         if (rc < 0)
2990                 return rc;
2991
2992         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2993 }
2994
2995 void
2996 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2997                        struct iscsi_nopin *hdr, bool nopout_response)
2998 {
2999         hdr->opcode             = ISCSI_OP_NOOP_IN;
3000         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3001         hton24(hdr->dlength, cmd->buf_ptr_size);
3002         if (nopout_response)
3003                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
3004         hdr->itt                = cmd->init_task_tag;
3005         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3006         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
3007                                   conn->stat_sn;
3008         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3009
3010         if (nopout_response)
3011                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3012
3013         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3014         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3015
3016         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3017                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3018                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3019                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3020 }
3021 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3022
3023 /*
3024  *      Unsolicited NOPIN, either requesting a response or not.
3025  */
3026 static int iscsit_send_unsolicited_nopin(
3027         struct iscsi_cmd *cmd,
3028         struct iscsi_conn *conn,
3029         int want_response)
3030 {
3031         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3032         int ret;
3033
3034         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3035
3036         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3037                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3038
3039         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3040         if (ret < 0)
3041                 return ret;
3042
3043         spin_lock_bh(&cmd->istate_lock);
3044         cmd->i_state = want_response ?
3045                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3046         spin_unlock_bh(&cmd->istate_lock);
3047
3048         return 0;
3049 }
3050
3051 static int
3052 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3053 {
3054         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3055
3056         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3057
3058         /*
3059          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3060          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3061          */
3062         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3063
3064         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3065                                                      cmd->buf_ptr,
3066                                                      cmd->buf_ptr_size);
3067 }
3068
3069 static int iscsit_send_r2t(
3070         struct iscsi_cmd *cmd,
3071         struct iscsi_conn *conn)
3072 {
3073         struct iscsi_r2t *r2t;
3074         struct iscsi_r2t_rsp *hdr;
3075         int ret;
3076
3077         r2t = iscsit_get_r2t_from_list(cmd);
3078         if (!r2t)
3079                 return -1;
3080
3081         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3082         memset(hdr, 0, ISCSI_HDR_LEN);
3083         hdr->opcode             = ISCSI_OP_R2T;
3084         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3085         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3086                         (struct scsi_lun *)&hdr->lun);
3087         hdr->itt                = cmd->init_task_tag;
3088         if (conn->conn_transport->iscsit_get_r2t_ttt)
3089                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3090         else
3091                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3092         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3093         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3094         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3095         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3096         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3097         hdr->data_offset        = cpu_to_be32(r2t->offset);
3098         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3099
3100         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3101                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3102                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3103                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3104                         r2t->offset, r2t->xfer_len, conn->cid);
3105
3106         spin_lock_bh(&cmd->r2t_lock);
3107         r2t->sent_r2t = 1;
3108         spin_unlock_bh(&cmd->r2t_lock);
3109
3110         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3111         if (ret < 0) {
3112                 return ret;
3113         }
3114
3115         spin_lock_bh(&cmd->dataout_timeout_lock);
3116         iscsit_start_dataout_timer(cmd, conn);
3117         spin_unlock_bh(&cmd->dataout_timeout_lock);
3118
3119         return 0;
3120 }
3121
3122 /*
3123  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3124  *              connection recovery.
3125  */
3126 int iscsit_build_r2ts_for_cmd(
3127         struct iscsi_conn *conn,
3128         struct iscsi_cmd *cmd,
3129         bool recovery)
3130 {
3131         int first_r2t = 1;
3132         u32 offset = 0, xfer_len = 0;
3133
3134         spin_lock_bh(&cmd->r2t_lock);
3135         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3136                 spin_unlock_bh(&cmd->r2t_lock);
3137                 return 0;
3138         }
3139
3140         if (conn->sess->sess_ops->DataSequenceInOrder &&
3141             !recovery)
3142                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3143
3144         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3145                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3146                         offset = cmd->r2t_offset;
3147
3148                         if (first_r2t && recovery) {
3149                                 int new_data_end = offset +
3150                                         conn->sess->sess_ops->MaxBurstLength -
3151                                         cmd->next_burst_len;
3152
3153                                 if (new_data_end > cmd->se_cmd.data_length)
3154                                         xfer_len = cmd->se_cmd.data_length - offset;
3155                                 else
3156                                         xfer_len =
3157                                                 conn->sess->sess_ops->MaxBurstLength -
3158                                                 cmd->next_burst_len;
3159                         } else {
3160                                 int new_data_end = offset +
3161                                         conn->sess->sess_ops->MaxBurstLength;
3162
3163                                 if (new_data_end > cmd->se_cmd.data_length)
3164                                         xfer_len = cmd->se_cmd.data_length - offset;
3165                                 else
3166                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3167                         }
3168
3169                         if ((s32)xfer_len < 0) {
3170                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3171                                 break;
3172                         }
3173
3174                         cmd->r2t_offset += xfer_len;
3175
3176                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3177                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3178                 } else {
3179                         struct iscsi_seq *seq;
3180
3181                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3182                         if (!seq) {
3183                                 spin_unlock_bh(&cmd->r2t_lock);
3184                                 return -1;
3185                         }
3186
3187                         offset = seq->offset;
3188                         xfer_len = seq->xfer_len;
3189
3190                         if (cmd->seq_send_order == cmd->seq_count)
3191                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3192                 }
3193                 cmd->outstanding_r2ts++;
3194                 first_r2t = 0;
3195
3196                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3197                         spin_unlock_bh(&cmd->r2t_lock);
3198                         return -1;
3199                 }
3200
3201                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3202                         break;
3203         }
3204         spin_unlock_bh(&cmd->r2t_lock);
3205
3206         return 0;
3207 }
3208 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3209
3210 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3211                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3212 {
3213         if (inc_stat_sn)
3214                 cmd->stat_sn = conn->stat_sn++;
3215
3216         atomic_long_inc(&conn->sess->rsp_pdus);
3217
3218         memset(hdr, 0, ISCSI_HDR_LEN);
3219         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3220         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3221         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3222                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3223                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3224         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3225                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3226                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3227         }
3228         hdr->response           = cmd->iscsi_response;
3229         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3230         hdr->itt                = cmd->init_task_tag;
3231         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3232
3233         iscsit_increment_maxcmdsn(cmd, conn->sess);
3234         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3235         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3236
3237         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3238                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3239                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3240                 cmd->se_cmd.scsi_status, conn->cid);
3241 }
3242 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3243
3244 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3245 {
3246         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3247         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3248         void *data_buf = NULL;
3249         u32 padding = 0, data_buf_len = 0;
3250
3251         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3252
3253         /*
3254          * Attach SENSE DATA payload to iSCSI Response PDU
3255          */
3256         if (cmd->se_cmd.sense_buffer &&
3257            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3258             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3259                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3260                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3261
3262                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3263                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3264                 data_buf = cmd->sense_buffer;
3265                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3266
3267                 if (padding) {
3268                         memset(cmd->sense_buffer +
3269                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3270                         pr_debug("Adding %u bytes of padding to"
3271                                 " SENSE.\n", padding);
3272                 }
3273
3274                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275                                 " Response PDU\n",
3276                                 cmd->se_cmd.scsi_sense_length);
3277         }
3278
3279         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3280                                                      data_buf_len);
3281 }
3282
3283 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3284 {
3285         switch (se_tmr->response) {
3286         case TMR_FUNCTION_COMPLETE:
3287                 return ISCSI_TMF_RSP_COMPLETE;
3288         case TMR_TASK_DOES_NOT_EXIST:
3289                 return ISCSI_TMF_RSP_NO_TASK;
3290         case TMR_LUN_DOES_NOT_EXIST:
3291                 return ISCSI_TMF_RSP_NO_LUN;
3292         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3293                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3294         case TMR_FUNCTION_REJECTED:
3295         default:
3296                 return ISCSI_TMF_RSP_REJECTED;
3297         }
3298 }
3299
3300 void
3301 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3302                           struct iscsi_tm_rsp *hdr)
3303 {
3304         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3305
3306         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3307         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3308         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3309         hdr->itt                = cmd->init_task_tag;
3310         cmd->stat_sn            = conn->stat_sn++;
3311         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3312
3313         iscsit_increment_maxcmdsn(cmd, conn->sess);
3314         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3315         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3316
3317         pr_debug("Built Task Management Response ITT: 0x%08x,"
3318                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3319                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3320 }
3321 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3322
3323 static int
3324 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3325 {
3326         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3327
3328         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3329
3330         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3331 }
3332
3333 #define SENDTARGETS_BUF_LIMIT 32768U
3334
3335 static int
3336 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3337                                   enum iscsit_transport_type network_transport,
3338                                   int skip_bytes, bool *completed)
3339 {
3340         char *payload = NULL;
3341         struct iscsi_conn *conn = cmd->conn;
3342         struct iscsi_portal_group *tpg;
3343         struct iscsi_tiqn *tiqn;
3344         struct iscsi_tpg_np *tpg_np;
3345         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3346         int target_name_printed;
3347         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3348         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3349         bool active;
3350
3351         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3352                          SENDTARGETS_BUF_LIMIT);
3353
3354         payload = kzalloc(buffer_len, GFP_KERNEL);
3355         if (!payload)
3356                 return -ENOMEM;
3357
3358         /*
3359          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3360          * explicit case..
3361          */
3362         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3363                 text_ptr = strchr(text_in, '=');
3364                 if (!text_ptr) {
3365                         pr_err("Unable to locate '=' string in text_in:"
3366                                " %s\n", text_in);
3367                         kfree(payload);
3368                         return -EINVAL;
3369                 }
3370                 /*
3371                  * Skip over '=' character..
3372                  */
3373                 text_ptr += 1;
3374         }
3375
3376         spin_lock(&tiqn_lock);
3377         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3378                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3379                      strcmp(tiqn->tiqn, text_ptr)) {
3380                         continue;
3381                 }
3382
3383                 target_name_printed = 0;
3384
3385                 spin_lock(&tiqn->tiqn_tpg_lock);
3386                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3387
3388                         /* If demo_mode_discovery=0 and generate_node_acls=0
3389                          * (demo mode dislabed) do not return
3390                          * TargetName+TargetAddress unless a NodeACL exists.
3391                          */
3392
3393                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3394                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3395                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3396                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3397                                 continue;
3398                         }
3399
3400                         spin_lock(&tpg->tpg_state_lock);
3401                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3402                         spin_unlock(&tpg->tpg_state_lock);
3403
3404                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3405                                 continue;
3406
3407                         spin_lock(&tpg->tpg_np_lock);
3408                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3409                                                 tpg_np_list) {
3410                                 struct iscsi_np *np = tpg_np->tpg_np;
3411                                 struct sockaddr_storage *sockaddr;
3412
3413                                 if (np->np_network_transport != network_transport)
3414                                         continue;
3415
3416                                 if (!target_name_printed) {
3417                                         len = sprintf(buf, "TargetName=%s",
3418                                                       tiqn->tiqn);
3419                                         len += 1;
3420
3421                                         if ((len + payload_len) > buffer_len) {
3422                                                 spin_unlock(&tpg->tpg_np_lock);
3423                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3424                                                 end_of_buf = 1;
3425                                                 goto eob;
3426                                         }
3427
3428                                         if (skip_bytes && len <= skip_bytes) {
3429                                                 skip_bytes -= len;
3430                                         } else {
3431                                                 memcpy(payload + payload_len, buf, len);
3432                                                 payload_len += len;
3433                                                 target_name_printed = 1;
3434                                                 if (len > skip_bytes)
3435                                                         skip_bytes = 0;
3436                                         }
3437                                 }
3438
3439                                 if (inet_addr_is_any((struct sockaddr *)&np->np_sockaddr))
3440                                         sockaddr = &conn->local_sockaddr;
3441                                 else
3442                                         sockaddr = &np->np_sockaddr;
3443
3444                                 len = sprintf(buf, "TargetAddress="
3445                                               "%pISpc,%hu",
3446                                               sockaddr,
3447                                               tpg->tpgt);
3448                                 len += 1;
3449
3450                                 if ((len + payload_len) > buffer_len) {
3451                                         spin_unlock(&tpg->tpg_np_lock);
3452                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3453                                         end_of_buf = 1;
3454                                         goto eob;
3455                                 }
3456
3457                                 if (skip_bytes && len <= skip_bytes) {
3458                                         skip_bytes -= len;
3459                                 } else {
3460                                         memcpy(payload + payload_len, buf, len);
3461                                         payload_len += len;
3462                                         if (len > skip_bytes)
3463                                                 skip_bytes = 0;
3464                                 }
3465                         }
3466                         spin_unlock(&tpg->tpg_np_lock);
3467                 }
3468                 spin_unlock(&tiqn->tiqn_tpg_lock);
3469 eob:
3470                 if (end_of_buf) {
3471                         *completed = false;
3472                         break;
3473                 }
3474
3475                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3476                         break;
3477         }
3478         spin_unlock(&tiqn_lock);
3479
3480         cmd->buf_ptr = payload;
3481
3482         return payload_len;
3483 }
3484
3485 int
3486 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3487                       struct iscsi_text_rsp *hdr,
3488                       enum iscsit_transport_type network_transport)
3489 {
3490         int text_length, padding;
3491         bool completed = true;
3492
3493         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3494                                                         cmd->read_data_done,
3495                                                         &completed);
3496         if (text_length < 0)
3497                 return text_length;
3498
3499         if (completed) {
3500                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3501         } else {
3502                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3503                 cmd->read_data_done += text_length;
3504                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3505                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3506         }
3507         hdr->opcode = ISCSI_OP_TEXT_RSP;
3508         padding = ((-text_length) & 3);
3509         hton24(hdr->dlength, text_length);
3510         hdr->itt = cmd->init_task_tag;
3511         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3512         cmd->stat_sn = conn->stat_sn++;
3513         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3514
3515         iscsit_increment_maxcmdsn(cmd, conn->sess);
3516         /*
3517          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3518          * correctly increment MaxCmdSN for each response answering a
3519          * non immediate text request with a valid CmdSN.
3520          */
3521         cmd->maxcmdsn_inc = 0;
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         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3526                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3527                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3528                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3529                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3530
3531         return text_length + padding;
3532 }
3533 EXPORT_SYMBOL(iscsit_build_text_rsp);
3534
3535 static int iscsit_send_text_rsp(
3536         struct iscsi_cmd *cmd,
3537         struct iscsi_conn *conn)
3538 {
3539         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3540         int text_length;
3541
3542         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3543                                 conn->conn_transport->transport_type);
3544         if (text_length < 0)
3545                 return text_length;
3546
3547         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3548                                                      cmd->buf_ptr,
3549                                                      text_length);
3550 }
3551
3552 void
3553 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3554                     struct iscsi_reject *hdr)
3555 {
3556         hdr->opcode             = ISCSI_OP_REJECT;
3557         hdr->reason             = cmd->reject_reason;
3558         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3559         hton24(hdr->dlength, ISCSI_HDR_LEN);
3560         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3561         cmd->stat_sn            = conn->stat_sn++;
3562         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3563         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3564         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3565
3566 }
3567 EXPORT_SYMBOL(iscsit_build_reject);
3568
3569 static int iscsit_send_reject(
3570         struct iscsi_cmd *cmd,
3571         struct iscsi_conn *conn)
3572 {
3573         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3574
3575         iscsit_build_reject(cmd, conn, hdr);
3576
3577         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3578                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3579
3580         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3581                                                      cmd->buf_ptr,
3582                                                      ISCSI_HDR_LEN);
3583 }
3584
3585 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3586 {
3587         int ord, cpu;
3588         /*
3589          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3590          * within iscsit_start_kthreads()
3591          *
3592          * Here we use bitmap_id to determine which CPU that this
3593          * iSCSI connection's RX/TX threads will be scheduled to
3594          * execute upon.
3595          */
3596         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3597         for_each_online_cpu(cpu) {
3598                 if (ord-- == 0) {
3599                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3600                         return;
3601                 }
3602         }
3603         /*
3604          * This should never be reached..
3605          */
3606         dump_stack();
3607         cpumask_setall(conn->conn_cpumask);
3608 }
3609
3610 int
3611 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3612 {
3613         int ret;
3614
3615         switch (state) {
3616         case ISTATE_SEND_R2T:
3617                 ret = iscsit_send_r2t(cmd, conn);
3618                 if (ret < 0)
3619                         goto err;
3620                 break;
3621         case ISTATE_REMOVE:
3622                 spin_lock_bh(&conn->cmd_lock);
3623                 list_del_init(&cmd->i_conn_node);
3624                 spin_unlock_bh(&conn->cmd_lock);
3625
3626                 iscsit_free_cmd(cmd, false);
3627                 break;
3628         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3629                 iscsit_mod_nopin_response_timer(conn);
3630                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3631                 if (ret < 0)
3632                         goto err;
3633                 break;
3634         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3635                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3636                 if (ret < 0)
3637                         goto err;
3638                 break;
3639         default:
3640                 pr_err("Unknown Opcode: 0x%02x ITT:"
3641                        " 0x%08x, i_state: %d on CID: %hu\n",
3642                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3643                        conn->cid);
3644                 goto err;
3645         }
3646
3647         return 0;
3648
3649 err:
3650         return -1;
3651 }
3652 EXPORT_SYMBOL(iscsit_immediate_queue);
3653
3654 static int
3655 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3656 {
3657         struct iscsit_transport *t = conn->conn_transport;
3658         struct iscsi_queue_req *qr;
3659         struct iscsi_cmd *cmd;
3660         u8 state;
3661         int ret;
3662
3663         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3664                 atomic_set(&conn->check_immediate_queue, 0);
3665                 cmd = qr->cmd;
3666                 state = qr->state;
3667                 kmem_cache_free(lio_qr_cache, qr);
3668
3669                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3670                 if (ret < 0)
3671                         return ret;
3672         }
3673
3674         return 0;
3675 }
3676
3677 int
3678 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3679 {
3680         int ret;
3681
3682 check_rsp_state:
3683         switch (state) {
3684         case ISTATE_SEND_DATAIN:
3685                 ret = iscsit_send_datain(cmd, conn);
3686                 if (ret < 0)
3687                         goto err;
3688                 else if (!ret)
3689                         /* more drs */
3690                         goto check_rsp_state;
3691                 else if (ret == 1) {
3692                         /* all done */
3693                         spin_lock_bh(&cmd->istate_lock);
3694                         cmd->i_state = ISTATE_SENT_STATUS;
3695                         spin_unlock_bh(&cmd->istate_lock);
3696
3697                         if (atomic_read(&conn->check_immediate_queue))
3698                                 return 1;
3699
3700                         return 0;
3701                 } else if (ret == 2) {
3702                         /* Still must send status,
3703                            SCF_TRANSPORT_TASK_SENSE was set */
3704                         spin_lock_bh(&cmd->istate_lock);
3705                         cmd->i_state = ISTATE_SEND_STATUS;
3706                         spin_unlock_bh(&cmd->istate_lock);
3707                         state = ISTATE_SEND_STATUS;
3708                         goto check_rsp_state;
3709                 }
3710
3711                 break;
3712         case ISTATE_SEND_STATUS:
3713         case ISTATE_SEND_STATUS_RECOVERY:
3714                 ret = iscsit_send_response(cmd, conn);
3715                 break;
3716         case ISTATE_SEND_LOGOUTRSP:
3717                 ret = iscsit_send_logout(cmd, conn);
3718                 break;
3719         case ISTATE_SEND_ASYNCMSG:
3720                 ret = iscsit_send_conn_drop_async_message(
3721                         cmd, conn);
3722                 break;
3723         case ISTATE_SEND_NOPIN:
3724                 ret = iscsit_send_nopin(cmd, conn);
3725                 break;
3726         case ISTATE_SEND_REJECT:
3727                 ret = iscsit_send_reject(cmd, conn);
3728                 break;
3729         case ISTATE_SEND_TASKMGTRSP:
3730                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3731                 if (ret != 0)
3732                         break;
3733                 ret = iscsit_tmr_post_handler(cmd, conn);
3734                 if (ret != 0)
3735                         iscsit_fall_back_to_erl0(conn->sess);
3736                 break;
3737         case ISTATE_SEND_TEXTRSP:
3738                 ret = iscsit_send_text_rsp(cmd, conn);
3739                 break;
3740         default:
3741                 pr_err("Unknown Opcode: 0x%02x ITT:"
3742                        " 0x%08x, i_state: %d on CID: %hu\n",
3743                        cmd->iscsi_opcode, cmd->init_task_tag,
3744                        state, conn->cid);
3745                 goto err;
3746         }
3747         if (ret < 0)
3748                 goto err;
3749
3750         switch (state) {
3751         case ISTATE_SEND_LOGOUTRSP:
3752                 if (!iscsit_logout_post_handler(cmd, conn))
3753                         return -ECONNRESET;
3754                 fallthrough;
3755         case ISTATE_SEND_STATUS:
3756         case ISTATE_SEND_ASYNCMSG:
3757         case ISTATE_SEND_NOPIN:
3758         case ISTATE_SEND_STATUS_RECOVERY:
3759         case ISTATE_SEND_TEXTRSP:
3760         case ISTATE_SEND_TASKMGTRSP:
3761         case ISTATE_SEND_REJECT:
3762                 spin_lock_bh(&cmd->istate_lock);
3763                 cmd->i_state = ISTATE_SENT_STATUS;
3764                 spin_unlock_bh(&cmd->istate_lock);
3765                 break;
3766         default:
3767                 pr_err("Unknown Opcode: 0x%02x ITT:"
3768                        " 0x%08x, i_state: %d on CID: %hu\n",
3769                        cmd->iscsi_opcode, cmd->init_task_tag,
3770                        cmd->i_state, conn->cid);
3771                 goto err;
3772         }
3773
3774         if (atomic_read(&conn->check_immediate_queue))
3775                 return 1;
3776
3777         return 0;
3778
3779 err:
3780         return -1;
3781 }
3782 EXPORT_SYMBOL(iscsit_response_queue);
3783
3784 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3785 {
3786         struct iscsit_transport *t = conn->conn_transport;
3787         struct iscsi_queue_req *qr;
3788         struct iscsi_cmd *cmd;
3789         u8 state;
3790         int ret;
3791
3792         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3793                 cmd = qr->cmd;
3794                 state = qr->state;
3795                 kmem_cache_free(lio_qr_cache, qr);
3796
3797                 ret = t->iscsit_response_queue(conn, cmd, state);
3798                 if (ret == 1 || ret < 0)
3799                         return ret;
3800         }
3801
3802         return 0;
3803 }
3804
3805 int iscsi_target_tx_thread(void *arg)
3806 {
3807         int ret = 0;
3808         struct iscsi_conn *conn = arg;
3809         bool conn_freed = false;
3810
3811         /*
3812          * Allow ourselves to be interrupted by SIGINT so that a
3813          * connection recovery / failure event can be triggered externally.
3814          */
3815         allow_signal(SIGINT);
3816
3817         while (!kthread_should_stop()) {
3818                 /*
3819                  * Ensure that both TX and RX per connection kthreads
3820                  * are scheduled to run on the same CPU.
3821                  */
3822                 iscsit_thread_check_cpumask(conn, current, 1);
3823
3824                 wait_event_interruptible(conn->queues_wq,
3825                                          !iscsit_conn_all_queues_empty(conn));
3826
3827                 if (signal_pending(current))
3828                         goto transport_err;
3829
3830 get_immediate:
3831                 ret = iscsit_handle_immediate_queue(conn);
3832                 if (ret < 0)
3833                         goto transport_err;
3834
3835                 ret = iscsit_handle_response_queue(conn);
3836                 if (ret == 1) {
3837                         goto get_immediate;
3838                 } else if (ret == -ECONNRESET) {
3839                         conn_freed = true;
3840                         goto out;
3841                 } else if (ret < 0) {
3842                         goto transport_err;
3843                 }
3844         }
3845
3846 transport_err:
3847         /*
3848          * Avoid the normal connection failure code-path if this connection
3849          * is still within LOGIN mode, and iscsi_np process context is
3850          * responsible for cleaning up the early connection failure.
3851          */
3852         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3853                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3854 out:
3855         if (!conn_freed) {
3856                 while (!kthread_should_stop()) {
3857                         msleep(100);
3858                 }
3859         }
3860         return 0;
3861 }
3862
3863 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3864 {
3865         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3866         struct iscsi_cmd *cmd;
3867         int ret = 0;
3868
3869         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3870         case ISCSI_OP_SCSI_CMD:
3871                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3872                 if (!cmd)
3873                         goto reject;
3874
3875                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3876                 break;
3877         case ISCSI_OP_SCSI_DATA_OUT:
3878                 ret = iscsit_handle_data_out(conn, buf);
3879                 break;
3880         case ISCSI_OP_NOOP_OUT:
3881                 cmd = NULL;
3882                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3883                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3884                         if (!cmd)
3885                                 goto reject;
3886                 }
3887                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3888                 break;
3889         case ISCSI_OP_SCSI_TMFUNC:
3890                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3891                 if (!cmd)
3892                         goto reject;
3893
3894                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3895                 break;
3896         case ISCSI_OP_TEXT:
3897                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3898                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3899                         if (!cmd)
3900                                 goto reject;
3901                 } else {
3902                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3903                         if (!cmd)
3904                                 goto reject;
3905                 }
3906
3907                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3908                 break;
3909         case ISCSI_OP_LOGOUT:
3910                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3911                 if (!cmd)
3912                         goto reject;
3913
3914                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3915                 if (ret > 0)
3916                         wait_for_completion_timeout(&conn->conn_logout_comp,
3917                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3918                 break;
3919         case ISCSI_OP_SNACK:
3920                 ret = iscsit_handle_snack(conn, buf);
3921                 break;
3922         default:
3923                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3924                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3925                         pr_err("Cannot recover from unknown"
3926                         " opcode while ERL=0, closing iSCSI connection.\n");
3927                         return -1;
3928                 }
3929                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3930                        " closing iSCSI connection.\n");
3931                 ret = -1;
3932                 break;
3933         }
3934
3935         return ret;
3936 reject:
3937         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3938 }
3939
3940 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3941 {
3942         bool ret;
3943
3944         spin_lock_bh(&conn->state_lock);
3945         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3946         spin_unlock_bh(&conn->state_lock);
3947
3948         return ret;
3949 }
3950
3951 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3952 {
3953         int ret;
3954         u8 *buffer, opcode;
3955         u32 checksum = 0, digest = 0;
3956         struct kvec iov;
3957
3958         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3959         if (!buffer)
3960                 return;
3961
3962         while (!kthread_should_stop()) {
3963                 /*
3964                  * Ensure that both TX and RX per connection kthreads
3965                  * are scheduled to run on the same CPU.
3966                  */
3967                 iscsit_thread_check_cpumask(conn, current, 0);
3968
3969                 memset(&iov, 0, sizeof(struct kvec));
3970
3971                 iov.iov_base    = buffer;
3972                 iov.iov_len     = ISCSI_HDR_LEN;
3973
3974                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3975                 if (ret != ISCSI_HDR_LEN) {
3976                         iscsit_rx_thread_wait_for_tcp(conn);
3977                         break;
3978                 }
3979
3980                 if (conn->conn_ops->HeaderDigest) {
3981                         iov.iov_base    = &digest;
3982                         iov.iov_len     = ISCSI_CRC_LEN;
3983
3984                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3985                         if (ret != ISCSI_CRC_LEN) {
3986                                 iscsit_rx_thread_wait_for_tcp(conn);
3987                                 break;
3988                         }
3989
3990                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3991                                                   ISCSI_HDR_LEN, 0, NULL,
3992                                                   &checksum);
3993
3994                         if (digest != checksum) {
3995                                 pr_err("HeaderDigest CRC32C failed,"
3996                                         " received 0x%08x, computed 0x%08x\n",
3997                                         digest, checksum);
3998                                 /*
3999                                  * Set the PDU to 0xff so it will intentionally
4000                                  * hit default in the switch below.
4001                                  */
4002                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4003                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4004                         } else {
4005                                 pr_debug("Got HeaderDigest CRC32C"
4006                                                 " 0x%08x\n", checksum);
4007                         }
4008                 }
4009
4010                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4011                         break;
4012
4013                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4014
4015                 if (conn->sess->sess_ops->SessionType &&
4016                    ((!(opcode & ISCSI_OP_TEXT)) ||
4017                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4018                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4019                         " while in Discovery Session, rejecting.\n", opcode);
4020                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4021                                           buffer);
4022                         break;
4023                 }
4024
4025                 ret = iscsi_target_rx_opcode(conn, buffer);
4026                 if (ret < 0)
4027                         break;
4028         }
4029
4030         kfree(buffer);
4031 }
4032
4033 int iscsi_target_rx_thread(void *arg)
4034 {
4035         int rc;
4036         struct iscsi_conn *conn = arg;
4037         bool conn_freed = false;
4038
4039         /*
4040          * Allow ourselves to be interrupted by SIGINT so that a
4041          * connection recovery / failure event can be triggered externally.
4042          */
4043         allow_signal(SIGINT);
4044         /*
4045          * Wait for iscsi_post_login_handler() to complete before allowing
4046          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4047          */
4048         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4049         if (rc < 0 || iscsi_target_check_conn_state(conn))
4050                 goto out;
4051
4052         if (!conn->conn_transport->iscsit_get_rx_pdu)
4053                 return 0;
4054
4055         conn->conn_transport->iscsit_get_rx_pdu(conn);
4056
4057         if (!signal_pending(current))
4058                 atomic_set(&conn->transport_failed, 1);
4059         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4060
4061 out:
4062         if (!conn_freed) {
4063                 while (!kthread_should_stop()) {
4064                         msleep(100);
4065                 }
4066         }
4067
4068         return 0;
4069 }
4070
4071 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4072 {
4073         LIST_HEAD(tmp_list);
4074         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4075         struct iscsi_session *sess = conn->sess;
4076         /*
4077          * We expect this function to only ever be called from either RX or TX
4078          * thread context via iscsit_close_connection() once the other context
4079          * has been reset -> returned sleeping pre-handler state.
4080          */
4081         spin_lock_bh(&conn->cmd_lock);
4082         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4083
4084         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4085                 struct se_cmd *se_cmd = &cmd->se_cmd;
4086
4087                 if (!se_cmd->se_tfo)
4088                         continue;
4089
4090                 spin_lock_irq(&se_cmd->t_state_lock);
4091                 if (se_cmd->transport_state & CMD_T_ABORTED) {
4092                         if (!(se_cmd->transport_state & CMD_T_TAS))
4093                                 /*
4094                                  * LIO's abort path owns the cleanup for this,
4095                                  * so put it back on the list and let
4096                                  * aborted_task handle it.
4097                                  */
4098                                 list_move_tail(&cmd->i_conn_node,
4099                                                &conn->conn_cmd_list);
4100                 } else {
4101                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4102                 }
4103                 spin_unlock_irq(&se_cmd->t_state_lock);
4104         }
4105         spin_unlock_bh(&conn->cmd_lock);
4106
4107         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4108                 list_del_init(&cmd->i_conn_node);
4109
4110                 iscsit_increment_maxcmdsn(cmd, sess);
4111                 iscsit_free_cmd(cmd, true);
4112
4113         }
4114 }
4115
4116 static void iscsit_stop_timers_for_cmds(
4117         struct iscsi_conn *conn)
4118 {
4119         struct iscsi_cmd *cmd;
4120
4121         spin_lock_bh(&conn->cmd_lock);
4122         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4123                 if (cmd->data_direction == DMA_TO_DEVICE)
4124                         iscsit_stop_dataout_timer(cmd);
4125         }
4126         spin_unlock_bh(&conn->cmd_lock);
4127 }
4128
4129 int iscsit_close_connection(
4130         struct iscsi_conn *conn)
4131 {
4132         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4133         struct iscsi_session    *sess = conn->sess;
4134
4135         pr_debug("Closing iSCSI connection CID %hu on SID:"
4136                 " %u\n", conn->cid, sess->sid);
4137         /*
4138          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4139          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4140          * sleeping and the logout response never got sent because the
4141          * connection failed.
4142          *
4143          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4144          * to signal logout response TX interrupt completion.  Go ahead and skip
4145          * this for iser since isert_rx_opcode() does not wait on logout failure,
4146          * and to avoid iscsi_conn pointer dereference in iser-target code.
4147          */
4148         if (!conn->conn_transport->rdma_shutdown)
4149                 complete(&conn->conn_logout_comp);
4150
4151         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4152                 if (conn->tx_thread &&
4153                     cmpxchg(&conn->tx_thread_active, true, false)) {
4154                         send_sig(SIGINT, conn->tx_thread, 1);
4155                         kthread_stop(conn->tx_thread);
4156                 }
4157         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4158                 if (conn->rx_thread &&
4159                     cmpxchg(&conn->rx_thread_active, true, false)) {
4160                         send_sig(SIGINT, conn->rx_thread, 1);
4161                         kthread_stop(conn->rx_thread);
4162                 }
4163         }
4164
4165         spin_lock(&iscsit_global->ts_bitmap_lock);
4166         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4167                               get_order(1));
4168         spin_unlock(&iscsit_global->ts_bitmap_lock);
4169
4170         iscsit_stop_timers_for_cmds(conn);
4171         iscsit_stop_nopin_response_timer(conn);
4172         iscsit_stop_nopin_timer(conn);
4173
4174         if (conn->conn_transport->iscsit_wait_conn)
4175                 conn->conn_transport->iscsit_wait_conn(conn);
4176
4177         /*
4178          * During Connection recovery drop unacknowledged out of order
4179          * commands for this connection, and prepare the other commands
4180          * for reallegiance.
4181          *
4182          * During normal operation clear the out of order commands (but
4183          * do not free the struct iscsi_ooo_cmdsn's) and release all
4184          * struct iscsi_cmds.
4185          */
4186         if (atomic_read(&conn->connection_recovery)) {
4187                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4188                 iscsit_prepare_cmds_for_reallegiance(conn);
4189         } else {
4190                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4191                 iscsit_release_commands_from_conn(conn);
4192         }
4193         iscsit_free_queue_reqs_for_conn(conn);
4194
4195         /*
4196          * Handle decrementing session or connection usage count if
4197          * a logout response was not able to be sent because the
4198          * connection failed.  Fall back to Session Recovery here.
4199          */
4200         if (atomic_read(&conn->conn_logout_remove)) {
4201                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4202                         iscsit_dec_conn_usage_count(conn);
4203                         iscsit_dec_session_usage_count(sess);
4204                 }
4205                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4206                         iscsit_dec_conn_usage_count(conn);
4207
4208                 atomic_set(&conn->conn_logout_remove, 0);
4209                 atomic_set(&sess->session_reinstatement, 0);
4210                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4211         }
4212
4213         spin_lock_bh(&sess->conn_lock);
4214         list_del(&conn->conn_list);
4215
4216         /*
4217          * Attempt to let the Initiator know this connection failed by
4218          * sending an Connection Dropped Async Message on another
4219          * active connection.
4220          */
4221         if (atomic_read(&conn->connection_recovery))
4222                 iscsit_build_conn_drop_async_message(conn);
4223
4224         spin_unlock_bh(&sess->conn_lock);
4225
4226         /*
4227          * If connection reinstatement is being performed on this connection,
4228          * up the connection reinstatement semaphore that is being blocked on
4229          * in iscsit_cause_connection_reinstatement().
4230          */
4231         spin_lock_bh(&conn->state_lock);
4232         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4233                 spin_unlock_bh(&conn->state_lock);
4234                 complete(&conn->conn_wait_comp);
4235                 wait_for_completion(&conn->conn_post_wait_comp);
4236                 spin_lock_bh(&conn->state_lock);
4237         }
4238
4239         /*
4240          * If connection reinstatement is being performed on this connection
4241          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4242          * connection wait rcfr semaphore that is being blocked on
4243          * an iscsit_connection_reinstatement_rcfr().
4244          */
4245         if (atomic_read(&conn->connection_wait_rcfr)) {
4246                 spin_unlock_bh(&conn->state_lock);
4247                 complete(&conn->conn_wait_rcfr_comp);
4248                 wait_for_completion(&conn->conn_post_wait_comp);
4249                 spin_lock_bh(&conn->state_lock);
4250         }
4251         atomic_set(&conn->connection_reinstatement, 1);
4252         spin_unlock_bh(&conn->state_lock);
4253
4254         /*
4255          * If any other processes are accessing this connection pointer we
4256          * must wait until they have completed.
4257          */
4258         iscsit_check_conn_usage_count(conn);
4259
4260         ahash_request_free(conn->conn_tx_hash);
4261         if (conn->conn_rx_hash) {
4262                 struct crypto_ahash *tfm;
4263
4264                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4265                 ahash_request_free(conn->conn_rx_hash);
4266                 crypto_free_ahash(tfm);
4267         }
4268
4269         if (conn->sock)
4270                 sock_release(conn->sock);
4271
4272         if (conn->conn_transport->iscsit_free_conn)
4273                 conn->conn_transport->iscsit_free_conn(conn);
4274
4275         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4276         conn->conn_state = TARG_CONN_STATE_FREE;
4277         iscsit_free_conn(conn);
4278
4279         spin_lock_bh(&sess->conn_lock);
4280         atomic_dec(&sess->nconn);
4281         pr_debug("Decremented iSCSI connection count to %hu from node:"
4282                 " %s\n", atomic_read(&sess->nconn),
4283                 sess->sess_ops->InitiatorName);
4284         /*
4285          * Make sure that if one connection fails in an non ERL=2 iSCSI
4286          * Session that they all fail.
4287          */
4288         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4289              !atomic_read(&sess->session_logout))
4290                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4291
4292         /*
4293          * If this was not the last connection in the session, and we are
4294          * performing session reinstatement or falling back to ERL=0, call
4295          * iscsit_stop_session() without sleeping to shutdown the other
4296          * active connections.
4297          */
4298         if (atomic_read(&sess->nconn)) {
4299                 if (!atomic_read(&sess->session_reinstatement) &&
4300                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4301                         spin_unlock_bh(&sess->conn_lock);
4302                         return 0;
4303                 }
4304                 if (!atomic_read(&sess->session_stop_active)) {
4305                         atomic_set(&sess->session_stop_active, 1);
4306                         spin_unlock_bh(&sess->conn_lock);
4307                         iscsit_stop_session(sess, 0, 0);
4308                         return 0;
4309                 }
4310                 spin_unlock_bh(&sess->conn_lock);
4311                 return 0;
4312         }
4313
4314         /*
4315          * If this was the last connection in the session and one of the
4316          * following is occurring:
4317          *
4318          * Session Reinstatement is not being performed, and are falling back
4319          * to ERL=0 call iscsit_close_session().
4320          *
4321          * Session Logout was requested.  iscsit_close_session() will be called
4322          * elsewhere.
4323          *
4324          * Session Continuation is not being performed, start the Time2Retain
4325          * handler and check if sleep_on_sess_wait_sem is active.
4326          */
4327         if (!atomic_read(&sess->session_reinstatement) &&
4328              atomic_read(&sess->session_fall_back_to_erl0)) {
4329                 spin_unlock_bh(&sess->conn_lock);
4330                 complete_all(&sess->session_wait_comp);
4331                 iscsit_close_session(sess);
4332
4333                 return 0;
4334         } else if (atomic_read(&sess->session_logout)) {
4335                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4336                 sess->session_state = TARG_SESS_STATE_FREE;
4337
4338                 if (atomic_read(&sess->session_close)) {
4339                         spin_unlock_bh(&sess->conn_lock);
4340                         complete_all(&sess->session_wait_comp);
4341                         iscsit_close_session(sess);
4342                 } else {
4343                         spin_unlock_bh(&sess->conn_lock);
4344                 }
4345
4346                 return 0;
4347         } else {
4348                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4349                 sess->session_state = TARG_SESS_STATE_FAILED;
4350
4351                 if (!atomic_read(&sess->session_continuation))
4352                         iscsit_start_time2retain_handler(sess);
4353
4354                 if (atomic_read(&sess->session_close)) {
4355                         spin_unlock_bh(&sess->conn_lock);
4356                         complete_all(&sess->session_wait_comp);
4357                         iscsit_close_session(sess);
4358                 } else {
4359                         spin_unlock_bh(&sess->conn_lock);
4360                 }
4361
4362                 return 0;
4363         }
4364 }
4365
4366 /*
4367  * If the iSCSI Session for the iSCSI Initiator Node exists,
4368  * forcefully shutdown the iSCSI NEXUS.
4369  */
4370 int iscsit_close_session(struct iscsi_session *sess)
4371 {
4372         struct iscsi_portal_group *tpg = sess->tpg;
4373         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4374
4375         if (atomic_read(&sess->nconn)) {
4376                 pr_err("%d connection(s) still exist for iSCSI session"
4377                         " to %s\n", atomic_read(&sess->nconn),
4378                         sess->sess_ops->InitiatorName);
4379                 BUG();
4380         }
4381
4382         spin_lock_bh(&se_tpg->session_lock);
4383         atomic_set(&sess->session_logout, 1);
4384         atomic_set(&sess->session_reinstatement, 1);
4385         iscsit_stop_time2retain_timer(sess);
4386         spin_unlock_bh(&se_tpg->session_lock);
4387
4388         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4389                 iscsit_free_connection_recovery_entries(sess);
4390
4391         /*
4392          * transport_deregister_session_configfs() will clear the
4393          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4394          * can be setting it again with __transport_register_session() in
4395          * iscsi_post_login_handler() again after the iscsit_stop_session()
4396          * completes in iscsi_np context.
4397          */
4398         transport_deregister_session_configfs(sess->se_sess);
4399
4400         /*
4401          * If any other processes are accessing this session pointer we must
4402          * wait until they have completed.  If we are in an interrupt (the
4403          * time2retain handler) and contain and active session usage count we
4404          * restart the timer and exit.
4405          */
4406         if (!in_interrupt()) {
4407                 iscsit_check_session_usage_count(sess);
4408         } else {
4409                 if (iscsit_check_session_usage_count(sess) == 2) {
4410                         atomic_set(&sess->session_logout, 0);
4411                         iscsit_start_time2retain_handler(sess);
4412                         return 0;
4413                 }
4414         }
4415
4416         transport_deregister_session(sess->se_sess);
4417
4418         iscsit_free_all_ooo_cmdsns(sess);
4419
4420         spin_lock_bh(&se_tpg->session_lock);
4421         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4422         sess->session_state = TARG_SESS_STATE_FREE;
4423         pr_debug("Released iSCSI session from node: %s\n",
4424                         sess->sess_ops->InitiatorName);
4425         tpg->nsessions--;
4426         if (tpg->tpg_tiqn)
4427                 tpg->tpg_tiqn->tiqn_nsessions--;
4428
4429         pr_debug("Decremented number of active iSCSI Sessions on"
4430                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4431
4432         ida_free(&sess_ida, sess->session_index);
4433         kfree(sess->sess_ops);
4434         sess->sess_ops = NULL;
4435         spin_unlock_bh(&se_tpg->session_lock);
4436
4437         kfree(sess);
4438         return 0;
4439 }
4440
4441 static void iscsit_logout_post_handler_closesession(
4442         struct iscsi_conn *conn)
4443 {
4444         struct iscsi_session *sess = conn->sess;
4445         int sleep = 1;
4446         /*
4447          * Traditional iscsi/tcp will invoke this logic from TX thread
4448          * context during session logout, so clear tx_thread_active and
4449          * sleep if iscsit_close_connection() has not already occured.
4450          *
4451          * Since iser-target invokes this logic from it's own workqueue,
4452          * always sleep waiting for RX/TX thread shutdown to complete
4453          * within iscsit_close_connection().
4454          */
4455         if (!conn->conn_transport->rdma_shutdown) {
4456                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4457                 if (!sleep)
4458                         return;
4459         }
4460
4461         atomic_set(&conn->conn_logout_remove, 0);
4462         complete(&conn->conn_logout_comp);
4463
4464         iscsit_dec_conn_usage_count(conn);
4465         atomic_set(&sess->session_close, 1);
4466         iscsit_stop_session(sess, sleep, sleep);
4467         iscsit_dec_session_usage_count(sess);
4468 }
4469
4470 static void iscsit_logout_post_handler_samecid(
4471         struct iscsi_conn *conn)
4472 {
4473         int sleep = 1;
4474
4475         if (!conn->conn_transport->rdma_shutdown) {
4476                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4477                 if (!sleep)
4478                         return;
4479         }
4480
4481         atomic_set(&conn->conn_logout_remove, 0);
4482         complete(&conn->conn_logout_comp);
4483
4484         iscsit_cause_connection_reinstatement(conn, sleep);
4485         iscsit_dec_conn_usage_count(conn);
4486 }
4487
4488 static void iscsit_logout_post_handler_diffcid(
4489         struct iscsi_conn *conn,
4490         u16 cid)
4491 {
4492         struct iscsi_conn *l_conn;
4493         struct iscsi_session *sess = conn->sess;
4494         bool conn_found = false;
4495
4496         if (!sess)
4497                 return;
4498
4499         spin_lock_bh(&sess->conn_lock);
4500         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4501                 if (l_conn->cid == cid) {
4502                         iscsit_inc_conn_usage_count(l_conn);
4503                         conn_found = true;
4504                         break;
4505                 }
4506         }
4507         spin_unlock_bh(&sess->conn_lock);
4508
4509         if (!conn_found)
4510                 return;
4511
4512         if (l_conn->sock)
4513                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4514
4515         spin_lock_bh(&l_conn->state_lock);
4516         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4517         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4518         spin_unlock_bh(&l_conn->state_lock);
4519
4520         iscsit_cause_connection_reinstatement(l_conn, 1);
4521         iscsit_dec_conn_usage_count(l_conn);
4522 }
4523
4524 /*
4525  *      Return of 0 causes the TX thread to restart.
4526  */
4527 int iscsit_logout_post_handler(
4528         struct iscsi_cmd *cmd,
4529         struct iscsi_conn *conn)
4530 {
4531         int ret = 0;
4532
4533         switch (cmd->logout_reason) {
4534         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4535                 switch (cmd->logout_response) {
4536                 case ISCSI_LOGOUT_SUCCESS:
4537                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4538                 default:
4539                         iscsit_logout_post_handler_closesession(conn);
4540                         break;
4541                 }
4542                 break;
4543         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4544                 if (conn->cid == cmd->logout_cid) {
4545                         switch (cmd->logout_response) {
4546                         case ISCSI_LOGOUT_SUCCESS:
4547                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4548                         default:
4549                                 iscsit_logout_post_handler_samecid(conn);
4550                                 break;
4551                         }
4552                 } else {
4553                         switch (cmd->logout_response) {
4554                         case ISCSI_LOGOUT_SUCCESS:
4555                                 iscsit_logout_post_handler_diffcid(conn,
4556                                         cmd->logout_cid);
4557                                 break;
4558                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4559                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4560                         default:
4561                                 break;
4562                         }
4563                         ret = 1;
4564                 }
4565                 break;
4566         case ISCSI_LOGOUT_REASON_RECOVERY:
4567                 switch (cmd->logout_response) {
4568                 case ISCSI_LOGOUT_SUCCESS:
4569                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4570                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4571                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4572                 default:
4573                         break;
4574                 }
4575                 ret = 1;
4576                 break;
4577         default:
4578                 break;
4579
4580         }
4581         return ret;
4582 }
4583 EXPORT_SYMBOL(iscsit_logout_post_handler);
4584
4585 void iscsit_fail_session(struct iscsi_session *sess)
4586 {
4587         struct iscsi_conn *conn;
4588
4589         spin_lock_bh(&sess->conn_lock);
4590         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4591                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4592                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4593         }
4594         spin_unlock_bh(&sess->conn_lock);
4595
4596         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4597         sess->session_state = TARG_SESS_STATE_FAILED;
4598 }
4599
4600 void iscsit_stop_session(
4601         struct iscsi_session *sess,
4602         int session_sleep,
4603         int connection_sleep)
4604 {
4605         u16 conn_count = atomic_read(&sess->nconn);
4606         struct iscsi_conn *conn, *conn_tmp = NULL;
4607         int is_last;
4608
4609         spin_lock_bh(&sess->conn_lock);
4610
4611         if (connection_sleep) {
4612                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4613                                 conn_list) {
4614                         if (conn_count == 0)
4615                                 break;
4616
4617                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4618                                 is_last = 1;
4619                         } else {
4620                                 iscsit_inc_conn_usage_count(conn_tmp);
4621                                 is_last = 0;
4622                         }
4623                         iscsit_inc_conn_usage_count(conn);
4624
4625                         spin_unlock_bh(&sess->conn_lock);
4626                         iscsit_cause_connection_reinstatement(conn, 1);
4627                         spin_lock_bh(&sess->conn_lock);
4628
4629                         iscsit_dec_conn_usage_count(conn);
4630                         if (is_last == 0)
4631                                 iscsit_dec_conn_usage_count(conn_tmp);
4632                         conn_count--;
4633                 }
4634         } else {
4635                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4636                         iscsit_cause_connection_reinstatement(conn, 0);
4637         }
4638
4639         if (session_sleep && atomic_read(&sess->nconn)) {
4640                 spin_unlock_bh(&sess->conn_lock);
4641                 wait_for_completion(&sess->session_wait_comp);
4642         } else
4643                 spin_unlock_bh(&sess->conn_lock);
4644 }
4645
4646 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4647 {
4648         struct iscsi_session *sess;
4649         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4650         struct se_session *se_sess, *se_sess_tmp;
4651         LIST_HEAD(free_list);
4652         int session_count = 0;
4653
4654         spin_lock_bh(&se_tpg->session_lock);
4655         if (tpg->nsessions && !force) {
4656                 spin_unlock_bh(&se_tpg->session_lock);
4657                 return -1;
4658         }
4659
4660         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4661                         sess_list) {
4662                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4663
4664                 spin_lock(&sess->conn_lock);
4665                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4666                     atomic_read(&sess->session_logout) ||
4667                     atomic_read(&sess->session_close) ||
4668                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4669                         spin_unlock(&sess->conn_lock);
4670                         continue;
4671                 }
4672                 iscsit_inc_session_usage_count(sess);
4673                 atomic_set(&sess->session_reinstatement, 1);
4674                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4675                 atomic_set(&sess->session_close, 1);
4676                 spin_unlock(&sess->conn_lock);
4677
4678                 list_move_tail(&se_sess->sess_list, &free_list);
4679         }
4680         spin_unlock_bh(&se_tpg->session_lock);
4681
4682         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4683                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4684
4685                 list_del_init(&se_sess->sess_list);
4686                 iscsit_stop_session(sess, 1, 1);
4687                 iscsit_dec_session_usage_count(sess);
4688                 session_count++;
4689         }
4690
4691         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4692                         " Group: %hu\n", session_count, tpg->tpgt);
4693         return 0;
4694 }
4695
4696 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4697 MODULE_VERSION("4.1.x");
4698 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4699 MODULE_LICENSE("GPL");
4700
4701 module_init(iscsi_target_init_module);
4702 module_exit(iscsi_target_cleanup_module);