drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <crypto/hash.h>
  20 #include <linux/string.h>
  21 #include <linux/kthread.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <linux/delay.h>
  27 #include <linux/sched/signal.h>
  28 #include <asm/unaligned.h>
  29 #include <net/ipv6.h>
  30 #include <scsi/scsi_proto.h>
  31 #include <scsi/iscsi_proto.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <target/target_core_base.h>
  34 #include <target/target_core_fabric.h>
  35
  36 #include <target/iscsi/iscsi_target_core.h>
  37 #include "iscsi_target_parameters.h"
  38 #include "iscsi_target_seq_pdu_list.h"
  39 #include "iscsi_target_datain_values.h"
  40 #include "iscsi_target_erl0.h"
  41 #include "iscsi_target_erl1.h"
  42 #include "iscsi_target_erl2.h"
  43 #include "iscsi_target_login.h"
  44 #include "iscsi_target_tmr.h"
  45 #include "iscsi_target_tpg.h"
  46 #include "iscsi_target_util.h"
  47 #include "iscsi_target.h"
  48 #include "iscsi_target_device.h"
  49 #include <target/iscsi/iscsi_target_stat.h>
  50
  51 #include <target/iscsi/iscsi_transport.h>
  52
  53 static LIST_HEAD(g_tiqn_list);
  54 static LIST_HEAD(g_np_list);
  55 static DEFINE_SPINLOCK(tiqn_lock);
  56 static DEFINE_MUTEX(np_lock);
  57
  58 static struct idr tiqn_idr;
  59 struct idr sess_idr;
  60 struct mutex auth_id_lock;
  61 spinlock_t sess_idr_lock;
  62
  63 struct iscsit_global *iscsit_global;
  64
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         struct iscsi_scsi_req *, u32);
  72
  73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  74 {
  75         struct iscsi_tiqn *tiqn = NULL;
  76
  77         spin_lock(&tiqn_lock);
  78         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  79                 if (!strcmp(tiqn->tiqn, buf)) {
  80
  81                         spin_lock(&tiqn->tiqn_state_lock);
  82                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  83                                 tiqn->tiqn_access_count++;
  84                                 spin_unlock(&tiqn->tiqn_state_lock);
  85                                 spin_unlock(&tiqn_lock);
  86                                 return tiqn;
  87                         }
  88                         spin_unlock(&tiqn->tiqn_state_lock);
  89                 }
  90         }
  91         spin_unlock(&tiqn_lock);
  92
  93         return NULL;
  94 }
  95
  96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  97 {
  98         spin_lock(&tiqn->tiqn_state_lock);
  99         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 100                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 101                 spin_unlock(&tiqn->tiqn_state_lock);
 102                 return 0;
 103         }
 104         spin_unlock(&tiqn->tiqn_state_lock);
 105
 106         return -1;
 107 }
 108
 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 110 {
 111         spin_lock(&tiqn->tiqn_state_lock);
 112         tiqn->tiqn_access_count--;
 113         spin_unlock(&tiqn->tiqn_state_lock);
 114 }
 115
 116 /*
 117  * Note that IQN formatting is expected to be done in userspace, and
 118  * no explict IQN format checks are done here.
 119  */
 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 121 {
 122         struct iscsi_tiqn *tiqn = NULL;
 123         int ret;
 124
 125         if (strlen(buf) >= ISCSI_IQN_LEN) {
 126                 pr_err("Target IQN exceeds %d bytes\n",
 127                                 ISCSI_IQN_LEN);
 128                 return ERR_PTR(-EINVAL);
 129         }
 130
 131         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 132         if (!tiqn)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 145
 146         idr_preload(GFP_KERNEL);
 147         spin_lock(&tiqn_lock);
 148
 149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 150         if (ret < 0) {
 151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 152                 spin_unlock(&tiqn_lock);
 153                 idr_preload_end();
 154                 kfree(tiqn);
 155                 return ERR_PTR(ret);
 156         }
 157         tiqn->tiqn_index = ret;
 158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 159
 160         spin_unlock(&tiqn_lock);
 161         idr_preload_end();
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         spin_unlock_bh(&np->np_thread_lock);
 220         /*
 221          * Determine if the portal group is accepting storage traffic.
 222          */
 223         spin_lock_bh(&tpg->tpg_state_lock);
 224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 225                 spin_unlock_bh(&tpg->tpg_state_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&tpg->tpg_state_lock);
 229
 230         /*
 231          * Here we serialize access across the TIQN+TPG Tuple.
 232          */
 233         ret = down_interruptible(&tpg->np_login_sem);
 234         if (ret != 0)
 235                 return -1;
 236
 237         spin_lock_bh(&tpg->tpg_state_lock);
 238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 239                 spin_unlock_bh(&tpg->tpg_state_lock);
 240                 up(&tpg->np_login_sem);
 241                 return -1;
 242         }
 243         spin_unlock_bh(&tpg->tpg_state_lock);
 244
 245         return 0;
 246 }
 247
 248 void iscsit_login_kref_put(struct kref *kref)
 249 {
 250         struct iscsi_tpg_np *tpg_np = container_of(kref,
 251                                 struct iscsi_tpg_np, tpg_np_kref);
 252
 253         complete(&tpg_np->tpg_np_comp);
 254 }
 255
 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 257                        struct iscsi_tpg_np *tpg_np)
 258 {
 259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 260
 261         up(&tpg->np_login_sem);
 262
 263         if (tpg_np)
 264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 265
 266         if (tiqn)
 267                 iscsit_put_tiqn_for_login(tiqn);
 268
 269         return 0;
 270 }
 271
 272 bool iscsit_check_np_match(
 273         struct sockaddr_storage *sockaddr,
 274         struct iscsi_np *np,
 275         int network_transport)
 276 {
 277         struct sockaddr_in *sock_in, *sock_in_e;
 278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 279         bool ip_match = false;
 280         u16 port, port_e;
 281
 282         if (sockaddr->ss_family == AF_INET6) {
 283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                             &sock_in6_e->sin6_addr.in6_u,
 288                             sizeof(struct in6_addr)))
 289                         ip_match = true;
 290
 291                 port = ntohs(sock_in6->sin6_port);
 292                 port_e = ntohs(sock_in6_e->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301                 port_e = ntohs(sock_in_e->sin_port);
 302         }
 303
 304         if (ip_match && (port_e == port) &&
 305             (np->np_network_transport == network_transport))
 306                 return true;
 307
 308         return false;
 309 }
 310
 311 /*
 312  * Called with mutex np_lock held
 313  */
 314 static struct iscsi_np *iscsit_get_np(
 315         struct sockaddr_storage *sockaddr,
 316         int network_transport)
 317 {
 318         struct iscsi_np *np;
 319         bool match;
 320
 321         list_for_each_entry(np, &g_np_list, np_list) {
 322                 spin_lock_bh(&np->np_thread_lock);
 323                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 324                         spin_unlock_bh(&np->np_thread_lock);
 325                         continue;
 326                 }
 327
 328                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 329                 if (match) {
 330                         /*
 331                          * Increment the np_exports reference count now to
 332                          * prevent iscsit_del_np() below from being called
 333                          * while iscsi_tpg_add_network_portal() is called.
 334                          */
 335                         np->np_exports++;
 336                         spin_unlock_bh(&np->np_thread_lock);
 337                         return np;
 338                 }
 339                 spin_unlock_bh(&np->np_thread_lock);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 struct iscsi_np *iscsit_add_np(
 346         struct sockaddr_storage *sockaddr,
 347         int network_transport)
 348 {
 349         struct iscsi_np *np;
 350         int ret;
 351
 352         mutex_lock(&np_lock);
 353
 354         /*
 355          * Locate the existing struct iscsi_np if already active..
 356          */
 357         np = iscsit_get_np(sockaddr, network_transport);
 358         if (np) {
 359                 mutex_unlock(&np_lock);
 360                 return np;
 361         }
 362
 363         np = kzalloc(sizeof(*np), GFP_KERNEL);
 364         if (!np) {
 365                 mutex_unlock(&np_lock);
 366                 return ERR_PTR(-ENOMEM);
 367         }
 368
 369         np->np_flags |= NPF_IP_NETWORK;
 370         np->np_network_transport = network_transport;
 371         spin_lock_init(&np->np_thread_lock);
 372         init_completion(&np->np_restart_comp);
 373         INIT_LIST_HEAD(&np->np_list);
 374
 375         ret = iscsi_target_setup_login_socket(np, sockaddr);
 376         if (ret != 0) {
 377                 kfree(np);
 378                 mutex_unlock(&np_lock);
 379                 return ERR_PTR(ret);
 380         }
 381
 382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 383         if (IS_ERR(np->np_thread)) {
 384                 pr_err("Unable to create kthread: iscsi_np\n");
 385                 ret = PTR_ERR(np->np_thread);
 386                 kfree(np);
 387                 mutex_unlock(&np_lock);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 399
 400         list_add_tail(&np->np_list, &g_np_list);
 401         mutex_unlock(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 404                 &np->np_sockaddr, np->np_transport->name);
 405
 406         return np;
 407 }
 408
 409 int iscsit_reset_np_thread(
 410         struct iscsi_np *np,
 411         struct iscsi_tpg_np *tpg_np,
 412         struct iscsi_portal_group *tpg,
 413         bool shutdown)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 return 0;
 419         }
 420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 421         atomic_inc(&np->np_reset_count);
 422
 423         if (np->np_thread) {
 424                 spin_unlock_bh(&np->np_thread_lock);
 425                 send_sig(SIGINT, np->np_thread, 1);
 426                 wait_for_completion(&np->np_restart_comp);
 427                 spin_lock_bh(&np->np_thread_lock);
 428         }
 429         spin_unlock_bh(&np->np_thread_lock);
 430
 431         if (tpg_np && shutdown) {
 432                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 433
 434                 wait_for_completion(&tpg_np->tpg_np_comp);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void iscsit_free_np(struct iscsi_np *np)
 441 {
 442         if (np->np_socket)
 443                 sock_release(np->np_socket);
 444 }
 445
 446 int iscsit_del_np(struct iscsi_np *np)
 447 {
 448         spin_lock_bh(&np->np_thread_lock);
 449         np->np_exports--;
 450         if (np->np_exports) {
 451                 np->enabled = true;
 452                 spin_unlock_bh(&np->np_thread_lock);
 453                 return 0;
 454         }
 455         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 456         spin_unlock_bh(&np->np_thread_lock);
 457
 458         if (np->np_thread) {
 459                 /*
 460                  * We need to send the signal to wakeup Linux/Net
 461                  * which may be sleeping in sock_accept()..
 462                  */
 463                 send_sig(SIGINT, np->np_thread, 1);
 464                 kthread_stop(np->np_thread);
 465                 np->np_thread = NULL;
 466         }
 467
 468         np->np_transport->iscsit_free_np(np);
 469
 470         mutex_lock(&np_lock);
 471         list_del(&np->np_list);
 472         mutex_unlock(&np_lock);
 473
 474         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 475                 &np->np_sockaddr, np->np_transport->name);
 476
 477         iscsit_put_transport(np->np_transport);
 478         kfree(np);
 479         return 0;
 480 }
 481
 482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 483
 484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 485 {
 486         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 487 }
 488 EXPORT_SYMBOL(iscsit_queue_rsp);
 489
 490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 491 {
 492         spin_lock_bh(&conn->cmd_lock);
 493         if (!list_empty(&cmd->i_conn_node))
 494                 list_del_init(&cmd->i_conn_node);
 495         spin_unlock_bh(&conn->cmd_lock);
 496
 497         __iscsit_free_cmd(cmd, true);
 498 }
 499 EXPORT_SYMBOL(iscsit_aborted_task);
 500
 501 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 502                                       u32, u32, u8 *, u8 *);
 503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 504
 505 static int
 506 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 507                           const void *data_buf, u32 data_buf_len)
 508 {
 509         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 510         struct kvec *iov;
 511         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 512         int ret;
 513
 514         iov = &cmd->iov_misc[0];
 515         iov[niov].iov_base      = cmd->pdu;
 516         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 517
 518         if (conn->conn_ops->HeaderDigest) {
 519                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 520
 521                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 522                                           ISCSI_HDR_LEN, 0, NULL,
 523                                           (u8 *)header_digest);
 524
 525                 iov[0].iov_len += ISCSI_CRC_LEN;
 526                 tx_size += ISCSI_CRC_LEN;
 527                 pr_debug("Attaching CRC32C HeaderDigest"
 528                          " to opcode 0x%x 0x%08x\n",
 529                          hdr->opcode, *header_digest);
 530         }
 531
 532         if (data_buf_len) {
 533                 u32 padding = ((-data_buf_len) & 3);
 534
 535                 iov[niov].iov_base      = (void *)data_buf;
 536                 iov[niov++].iov_len     = data_buf_len;
 537                 tx_size += data_buf_len;
 538
 539                 if (padding != 0) {
 540                         iov[niov].iov_base = &cmd->pad_bytes;
 541                         iov[niov++].iov_len = padding;
 542                         tx_size += padding;
 543                         pr_debug("Attaching %u additional"
 544                                  " padding bytes.\n", padding);
 545                 }
 546
 547                 if (conn->conn_ops->DataDigest) {
 548                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 549                                                   data_buf, data_buf_len,
 550                                                   padding,
 551                                                   (u8 *)&cmd->pad_bytes,
 552                                                   (u8 *)&cmd->data_crc);
 553
 554                         iov[niov].iov_base = &cmd->data_crc;
 555                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 556                         tx_size += ISCSI_CRC_LEN;
 557                         pr_debug("Attached DataDigest for %u"
 558                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 559                                  data_buf_len, hdr->opcode, cmd->data_crc);
 560                 }
 561         }
 562
 563         cmd->iov_misc_count = niov;
 564         cmd->tx_size = tx_size;
 565
 566         ret = iscsit_send_tx_data(cmd, conn, 1);
 567         if (ret < 0) {
 568                 iscsit_tx_thread_wait_for_tcp(conn);
 569                 return ret;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 576 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 578                                     u32, u32, u32, u8 *);
 579 static int
 580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 581                        const struct iscsi_datain *datain)
 582 {
 583         struct kvec *iov;
 584         u32 iov_count = 0, tx_size = 0;
 585         int ret, iov_ret;
 586
 587         iov = &cmd->iov_data[0];
 588         iov[iov_count].iov_base = cmd->pdu;
 589         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 590         tx_size += ISCSI_HDR_LEN;
 591
 592         if (conn->conn_ops->HeaderDigest) {
 593                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 594
 595                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 596                                           ISCSI_HDR_LEN, 0, NULL,
 597                                           (u8 *)header_digest);
 598
 599                 iov[0].iov_len += ISCSI_CRC_LEN;
 600                 tx_size += ISCSI_CRC_LEN;
 601
 602                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 603                          *header_digest);
 604         }
 605
 606         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 607                                    datain->offset, datain->length);
 608         if (iov_ret < 0)
 609                 return -1;
 610
 611         iov_count += iov_ret;
 612         tx_size += datain->length;
 613
 614         cmd->padding = ((-datain->length) & 3);
 615         if (cmd->padding) {
 616                 iov[iov_count].iov_base         = cmd->pad_bytes;
 617                 iov[iov_count++].iov_len        = cmd->padding;
 618                 tx_size += cmd->padding;
 619
 620                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 621         }
 622
 623         if (conn->conn_ops->DataDigest) {
 624                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 625                                                          cmd, datain->offset,
 626                                                          datain->length,
 627                                                          cmd->padding,
 628                                                          cmd->pad_bytes);
 629
 630                 iov[iov_count].iov_base = &cmd->data_crc;
 631                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 632                 tx_size += ISCSI_CRC_LEN;
 633
 634                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 635                          datain->length + cmd->padding, cmd->data_crc);
 636         }
 637
 638         cmd->iov_data_count = iov_count;
 639         cmd->tx_size = tx_size;
 640
 641         ret = iscsit_fe_sendpage_sg(cmd, conn);
 642
 643         iscsit_unmap_iovec(cmd);
 644
 645         if (ret < 0) {
 646                 iscsit_tx_thread_wait_for_tcp(conn);
 647                 return ret;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 654                            struct iscsi_datain_req *dr, const void *buf,
 655                            u32 buf_len)
 656 {
 657         if (dr)
 658                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 659         else
 660                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 661 }
 662
 663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 664 {
 665         return TARGET_PROT_NORMAL;
 666 }
 667
 668 static struct iscsit_transport iscsi_target_transport = {
 669         .name                   = "iSCSI/TCP",
 670         .transport_type         = ISCSI_TCP,
 671         .rdma_shutdown          = false,
 672         .owner                  = NULL,
 673         .iscsit_setup_np        = iscsit_setup_np,
 674         .iscsit_accept_np       = iscsit_accept_np,
 675         .iscsit_free_np         = iscsit_free_np,
 676         .iscsit_get_login_rx    = iscsit_get_login_rx,
 677         .iscsit_put_login_tx    = iscsit_put_login_tx,
 678         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 679         .iscsit_immediate_queue = iscsit_immediate_queue,
 680         .iscsit_response_queue  = iscsit_response_queue,
 681         .iscsit_queue_data_in   = iscsit_queue_rsp,
 682         .iscsit_queue_status    = iscsit_queue_rsp,
 683         .iscsit_aborted_task    = iscsit_aborted_task,
 684         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 685         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 686         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 687 };
 688
 689 static int __init iscsi_target_init_module(void)
 690 {
 691         int ret = 0, size;
 692
 693         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 694         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 695         if (!iscsit_global)
 696                 return -1;
 697
 698         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 699         mutex_init(&auth_id_lock);
 700         spin_lock_init(&sess_idr_lock);
 701         idr_init(&tiqn_idr);
 702         idr_init(&sess_idr);
 703
 704         ret = target_register_template(&iscsi_ops);
 705         if (ret)
 706                 goto out;
 707
 708         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 709         iscsit_global->ts_bitmap = vzalloc(size);
 710         if (!iscsit_global->ts_bitmap)
 711                 goto configfs_out;
 712
 713         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 714                         sizeof(struct iscsi_queue_req),
 715                         __alignof__(struct iscsi_queue_req), 0, NULL);
 716         if (!lio_qr_cache) {
 717                 pr_err("nable to kmem_cache_create() for"
 718                                 " lio_qr_cache\n");
 719                 goto bitmap_out;
 720         }
 721
 722         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 723                         sizeof(struct iscsi_datain_req),
 724                         __alignof__(struct iscsi_datain_req), 0, NULL);
 725         if (!lio_dr_cache) {
 726                 pr_err("Unable to kmem_cache_create() for"
 727                                 " lio_dr_cache\n");
 728                 goto qr_out;
 729         }
 730
 731         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 732                         sizeof(struct iscsi_ooo_cmdsn),
 733                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 734         if (!lio_ooo_cache) {
 735                 pr_err("Unable to kmem_cache_create() for"
 736                                 " lio_ooo_cache\n");
 737                 goto dr_out;
 738         }
 739
 740         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 741                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 742                         0, NULL);
 743         if (!lio_r2t_cache) {
 744                 pr_err("Unable to kmem_cache_create() for"
 745                                 " lio_r2t_cache\n");
 746                 goto ooo_out;
 747         }
 748
 749         iscsit_register_transport(&iscsi_target_transport);
 750
 751         if (iscsit_load_discovery_tpg() < 0)
 752                 goto r2t_out;
 753
 754         return ret;
 755 r2t_out:
 756         iscsit_unregister_transport(&iscsi_target_transport);
 757         kmem_cache_destroy(lio_r2t_cache);
 758 ooo_out:
 759         kmem_cache_destroy(lio_ooo_cache);
 760 dr_out:
 761         kmem_cache_destroy(lio_dr_cache);
 762 qr_out:
 763         kmem_cache_destroy(lio_qr_cache);
 764 bitmap_out:
 765         vfree(iscsit_global->ts_bitmap);
 766 configfs_out:
 767         /* XXX: this probably wants it to be it's own unwind step.. */
 768         if (iscsit_global->discovery_tpg)
 769                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 770         target_unregister_template(&iscsi_ops);
 771 out:
 772         kfree(iscsit_global);
 773         return -ENOMEM;
 774 }
 775
 776 static void __exit iscsi_target_cleanup_module(void)
 777 {
 778         iscsit_release_discovery_tpg();
 779         iscsit_unregister_transport(&iscsi_target_transport);
 780         kmem_cache_destroy(lio_qr_cache);
 781         kmem_cache_destroy(lio_dr_cache);
 782         kmem_cache_destroy(lio_ooo_cache);
 783         kmem_cache_destroy(lio_r2t_cache);
 784
 785         /*
 786          * Shutdown discovery sessions and disable discovery TPG
 787          */
 788         if (iscsit_global->discovery_tpg)
 789                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 790
 791         target_unregister_template(&iscsi_ops);
 792
 793         vfree(iscsit_global->ts_bitmap);
 794         kfree(iscsit_global);
 795 }
 796
 797 int iscsit_add_reject(
 798         struct iscsi_conn *conn,
 799         u8 reason,
 800         unsigned char *buf)
 801 {
 802         struct iscsi_cmd *cmd;
 803
 804         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 805         if (!cmd)
 806                 return -1;
 807
 808         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 809         cmd->reject_reason = reason;
 810
 811         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 812         if (!cmd->buf_ptr) {
 813                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 814                 iscsit_free_cmd(cmd, false);
 815                 return -1;
 816         }
 817
 818         spin_lock_bh(&conn->cmd_lock);
 819         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 820         spin_unlock_bh(&conn->cmd_lock);
 821
 822         cmd->i_state = ISTATE_SEND_REJECT;
 823         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 824
 825         return -1;
 826 }
 827 EXPORT_SYMBOL(iscsit_add_reject);
 828
 829 static int iscsit_add_reject_from_cmd(
 830         struct iscsi_cmd *cmd,
 831         u8 reason,
 832         bool add_to_conn,
 833         unsigned char *buf)
 834 {
 835         struct iscsi_conn *conn;
 836         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 837
 838         if (!cmd->conn) {
 839                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 840                                 cmd->init_task_tag);
 841                 return -1;
 842         }
 843         conn = cmd->conn;
 844
 845         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 846         cmd->reject_reason = reason;
 847
 848         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 849         if (!cmd->buf_ptr) {
 850                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 851                 iscsit_free_cmd(cmd, false);
 852                 return -1;
 853         }
 854
 855         if (add_to_conn) {
 856                 spin_lock_bh(&conn->cmd_lock);
 857                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 858                 spin_unlock_bh(&conn->cmd_lock);
 859         }
 860
 861         cmd->i_state = ISTATE_SEND_REJECT;
 862         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 863         /*
 864          * Perform the kref_put now if se_cmd has already been setup by
 865          * scsit_setup_scsi_cmd()
 866          */
 867         if (do_put) {
 868                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 869                 target_put_sess_cmd(&cmd->se_cmd);
 870         }
 871         return -1;
 872 }
 873
 874 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 875                                  unsigned char *buf)
 876 {
 877         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 878 }
 879
 880 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 881 {
 882         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 883 }
 884 EXPORT_SYMBOL(iscsit_reject_cmd);
 885
 886 /*
 887  * Map some portion of the allocated scatterlist to an iovec, suitable for
 888  * kernel sockets to copy data in/out.
 889  */
 890 static int iscsit_map_iovec(
 891         struct iscsi_cmd *cmd,
 892         struct kvec *iov,
 893         u32 data_offset,
 894         u32 data_length)
 895 {
 896         u32 i = 0;
 897         struct scatterlist *sg;
 898         unsigned int page_off;
 899
 900         /*
 901          * We know each entry in t_data_sg contains a page.
 902          */
 903         u32 ent = data_offset / PAGE_SIZE;
 904
 905         if (ent >= cmd->se_cmd.t_data_nents) {
 906                 pr_err("Initial page entry out-of-bounds\n");
 907                 return -1;
 908         }
 909
 910         sg = &cmd->se_cmd.t_data_sg[ent];
 911         page_off = (data_offset % PAGE_SIZE);
 912
 913         cmd->first_data_sg = sg;
 914         cmd->first_data_sg_off = page_off;
 915
 916         while (data_length) {
 917                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 918
 919                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 920                 iov[i].iov_len = cur_len;
 921
 922                 data_length -= cur_len;
 923                 page_off = 0;
 924                 sg = sg_next(sg);
 925                 i++;
 926         }
 927
 928         cmd->kmapped_nents = i;
 929
 930         return i;
 931 }
 932
 933 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 934 {
 935         u32 i;
 936         struct scatterlist *sg;
 937
 938         sg = cmd->first_data_sg;
 939
 940         for (i = 0; i < cmd->kmapped_nents; i++)
 941                 kunmap(sg_page(&sg[i]));
 942 }
 943
 944 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 945 {
 946         LIST_HEAD(ack_list);
 947         struct iscsi_cmd *cmd, *cmd_p;
 948
 949         conn->exp_statsn = exp_statsn;
 950
 951         if (conn->sess->sess_ops->RDMAExtensions)
 952                 return;
 953
 954         spin_lock_bh(&conn->cmd_lock);
 955         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 956                 spin_lock(&cmd->istate_lock);
 957                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 958                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 959                         cmd->i_state = ISTATE_REMOVE;
 960                         spin_unlock(&cmd->istate_lock);
 961                         list_move_tail(&cmd->i_conn_node, &ack_list);
 962                         continue;
 963                 }
 964                 spin_unlock(&cmd->istate_lock);
 965         }
 966         spin_unlock_bh(&conn->cmd_lock);
 967
 968         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 969                 list_del_init(&cmd->i_conn_node);
 970                 iscsit_free_cmd(cmd, false);
 971         }
 972 }
 973
 974 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 975 {
 976         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 977
 978         iov_count += ISCSI_IOV_DATA_BUFFER;
 979         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 980         if (!cmd->iov_data)
 981                 return -ENOMEM;
 982
 983         cmd->orig_iov_data_count = iov_count;
 984         return 0;
 985 }
 986
 987 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 988                           unsigned char *buf)
 989 {
 990         int data_direction, payload_length;
 991         struct iscsi_scsi_req *hdr;
 992         int iscsi_task_attr;
 993         int sam_task_attr;
 994
 995         atomic_long_inc(&conn->sess->cmd_pdus);
 996
 997         hdr                     = (struct iscsi_scsi_req *) buf;
 998         payload_length          = ntoh24(hdr->dlength);
 999
1000         /* FIXME; Add checks for AdditionalHeaderSegment */
1001
1002         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1003             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1004                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1005                                 " not set. Bad iSCSI Initiator.\n");
1006                 return iscsit_add_reject_cmd(cmd,
1007                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1008         }
1009
1010         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1011              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1012                 /*
1013                  * From RFC-3720 Section 10.3.1:
1014                  *
1015                  * "Either or both of R and W MAY be 1 when either the
1016                  *  Expected Data Transfer Length and/or Bidirectional Read
1017                  *  Expected Data Transfer Length are 0"
1018                  *
1019                  * For this case, go ahead and clear the unnecssary bits
1020                  * to avoid any confusion with ->data_direction.
1021                  */
1022                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1023                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1024
1025                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1026                         " set when Expected Data Transfer Length is 0 for"
1027                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1028         }
1029
1030         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1031             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1032                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1033                         " MUST be set if Expected Data Transfer Length is not 0."
1034                         " Bad iSCSI Initiator\n");
1035                 return iscsit_add_reject_cmd(cmd,
1036                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1037         }
1038
1039         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1041                 pr_err("Bidirectional operations not supported!\n");
1042                 return iscsit_add_reject_cmd(cmd,
1043                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1044         }
1045
1046         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1047                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1048                                 " Scsi Command PDU.\n");
1049                 return iscsit_add_reject_cmd(cmd,
1050                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1051         }
1052
1053         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1054                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1055                         " protocol error.\n", payload_length);
1056                 return iscsit_add_reject_cmd(cmd,
1057                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1058         }
1059
1060         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1061             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1062                 pr_err("Expected Data Transfer Length and Length of"
1063                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1064                         " bit is not set protocol error\n");
1065                 return iscsit_add_reject_cmd(cmd,
1066                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1067         }
1068
1069         if (payload_length > be32_to_cpu(hdr->data_length)) {
1070                 pr_err("DataSegmentLength: %u is greater than"
1071                         " EDTL: %u, protocol error.\n", payload_length,
1072                                 hdr->data_length);
1073                 return iscsit_add_reject_cmd(cmd,
1074                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1075         }
1076
1077         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1078                 pr_err("DataSegmentLength: %u is greater than"
1079                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1080                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1081                 return iscsit_add_reject_cmd(cmd,
1082                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1083         }
1084
1085         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1086                 pr_err("DataSegmentLength: %u is greater than"
1087                         " FirstBurstLength: %u, protocol error.\n",
1088                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1089                 return iscsit_add_reject_cmd(cmd,
1090                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1091         }
1092
1093         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1094                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1095                           DMA_NONE;
1096
1097         cmd->data_direction = data_direction;
1098         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1099         /*
1100          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1101          */
1102         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1103             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1104                 sam_task_attr = TCM_SIMPLE_TAG;
1105         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1106                 sam_task_attr = TCM_ORDERED_TAG;
1107         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1108                 sam_task_attr = TCM_HEAD_TAG;
1109         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1110                 sam_task_attr = TCM_ACA_TAG;
1111         else {
1112                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1113                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1114                 sam_task_attr = TCM_SIMPLE_TAG;
1115         }
1116
1117         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1118         cmd->i_state            = ISTATE_NEW_CMD;
1119         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1120         cmd->immediate_data     = (payload_length) ? 1 : 0;
1121         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1122                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1123         if (cmd->unsolicited_data)
1124                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1125
1126         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1127         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1128                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1129         else
1130                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1131         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1132         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1133         cmd->first_burst_len    = payload_length;
1134
1135         if (!conn->sess->sess_ops->RDMAExtensions &&
1136              cmd->data_direction == DMA_FROM_DEVICE) {
1137                 struct iscsi_datain_req *dr;
1138
1139                 dr = iscsit_allocate_datain_req();
1140                 if (!dr)
1141                         return iscsit_add_reject_cmd(cmd,
1142                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1143
1144                 iscsit_attach_datain_req(cmd, dr);
1145         }
1146
1147         /*
1148          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1149          */
1150         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1151                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1152                         cmd->data_direction, sam_task_attr,
1153                         cmd->sense_buffer + 2);
1154
1155         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1156                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1157                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1158                 conn->cid);
1159
1160         target_get_sess_cmd(&cmd->se_cmd, true);
1161
1162         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1163                                                      scsilun_to_int(&hdr->lun));
1164         if (cmd->sense_reason)
1165                 goto attach_cmd;
1166
1167         /* only used for printks or comparing with ->ref_task_tag */
1168         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1169         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1170         if (cmd->sense_reason) {
1171                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1172                         return iscsit_add_reject_cmd(cmd,
1173                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1174                 }
1175
1176                 goto attach_cmd;
1177         }
1178
1179         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1180                 return iscsit_add_reject_cmd(cmd,
1181                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182         }
1183
1184 attach_cmd:
1185         spin_lock_bh(&conn->cmd_lock);
1186         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1187         spin_unlock_bh(&conn->cmd_lock);
1188         /*
1189          * Check if we need to delay processing because of ALUA
1190          * Active/NonOptimized primary access state..
1191          */
1192         core_alua_check_nonop_delay(&cmd->se_cmd);
1193
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1197
1198 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1199 {
1200         iscsit_set_dataout_sequence_values(cmd);
1201
1202         spin_lock_bh(&cmd->dataout_timeout_lock);
1203         iscsit_start_dataout_timer(cmd, cmd->conn);
1204         spin_unlock_bh(&cmd->dataout_timeout_lock);
1205 }
1206 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1207
1208 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1209                             struct iscsi_scsi_req *hdr)
1210 {
1211         int cmdsn_ret = 0;
1212         /*
1213          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1214          * the Immediate Bit is not set, and no Immediate
1215          * Data is attached.
1216          *
1217          * A PDU/CmdSN carrying Immediate Data can only
1218          * be processed after the DataCRC has passed.
1219          * If the DataCRC fails, the CmdSN MUST NOT
1220          * be acknowledged. (See below)
1221          */
1222         if (!cmd->immediate_data) {
1223                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1224                                         (unsigned char *)hdr, hdr->cmdsn);
1225                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1226                         return -1;
1227                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1228                         target_put_sess_cmd(&cmd->se_cmd);
1229                         return 0;
1230                 }
1231         }
1232
1233         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1234
1235         /*
1236          * If no Immediate Data is attached, it's OK to return now.
1237          */
1238         if (!cmd->immediate_data) {
1239                 if (!cmd->sense_reason && cmd->unsolicited_data)
1240                         iscsit_set_unsoliticed_dataout(cmd);
1241                 if (!cmd->sense_reason)
1242                         return 0;
1243
1244                 target_put_sess_cmd(&cmd->se_cmd);
1245                 return 0;
1246         }
1247
1248         /*
1249          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1250          * execution.  These exceptions are processed in CmdSN order using
1251          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1252          */
1253         if (cmd->sense_reason)
1254                 return 1;
1255         /*
1256          * Call directly into transport_generic_new_cmd() to perform
1257          * the backend memory allocation.
1258          */
1259         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1260         if (cmd->sense_reason)
1261                 return 1;
1262
1263         return 0;
1264 }
1265 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1266
1267 static int
1268 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1269                           bool dump_payload)
1270 {
1271         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1272         /*
1273          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1274          */
1275         if (dump_payload)
1276                 goto after_immediate_data;
1277         /*
1278          * Check for underflow case where both EDTL and immediate data payload
1279          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1280          * already been set in target_cmd_size_check() as se_cmd->data_length.
1281          *
1282          * For this special case, fail the command and dump the immediate data
1283          * payload.
1284          */
1285         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1286                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1287                 goto after_immediate_data;
1288         }
1289
1290         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291                                         cmd->first_burst_len);
1292 after_immediate_data:
1293         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294                 /*
1295                  * A PDU/CmdSN carrying Immediate Data passed
1296                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297                  * Immediate Bit is not set.
1298                  */
1299                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300                                         (unsigned char *)hdr, hdr->cmdsn);
1301                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302                         return -1;
1303
1304                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305                         int rc;
1306
1307                         rc = iscsit_dump_data_payload(cmd->conn,
1308                                                       cmd->first_burst_len, 1);
1309                         target_put_sess_cmd(&cmd->se_cmd);
1310                         return rc;
1311                 } else if (cmd->unsolicited_data)
1312                         iscsit_set_unsoliticed_dataout(cmd);
1313
1314         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315                 /*
1316                  * Immediate Data failed DataCRC and ERL>=1,
1317                  * silently drop this PDU and let the initiator
1318                  * plug the CmdSN gap.
1319                  *
1320                  * FIXME: Send Unsolicited NOPIN with reserved
1321                  * TTT here to help the initiator figure out
1322                  * the missing CmdSN, although they should be
1323                  * intelligent enough to determine the missing
1324                  * CmdSN and issue a retry to plug the sequence.
1325                  */
1326                 cmd->i_state = ISTATE_REMOVE;
1327                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329                 return -1;
1330
1331         return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336                            unsigned char *buf)
1337 {
1338         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339         int rc, immed_data;
1340         bool dump_payload = false;
1341
1342         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343         if (rc < 0)
1344                 return 0;
1345         /*
1346          * Allocation iovecs needed for struct socket operations for
1347          * traditional iSCSI block I/O.
1348          */
1349         if (iscsit_allocate_iovecs(cmd) < 0) {
1350                 return iscsit_reject_cmd(cmd,
1351                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352         }
1353         immed_data = cmd->immediate_data;
1354
1355         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356         if (rc < 0)
1357                 return rc;
1358         else if (rc > 0)
1359                 dump_payload = true;
1360
1361         if (!immed_data)
1362                 return 0;
1363
1364         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368         struct ahash_request *hash,
1369         struct iscsi_cmd *cmd,
1370         u32 data_offset,
1371         u32 data_length,
1372         u32 padding,
1373         u8 *pad_bytes)
1374 {
1375         u32 data_crc;
1376         struct scatterlist *sg;
1377         unsigned int page_off;
1378
1379         crypto_ahash_init(hash);
1380
1381         sg = cmd->first_data_sg;
1382         page_off = cmd->first_data_sg_off;
1383
1384         if (data_length && page_off) {
1385                 struct scatterlist first_sg;
1386                 u32 len = min_t(u32, data_length, sg->length - page_off);
1387
1388                 sg_init_table(&first_sg, 1);
1389                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1390
1391                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1392                 crypto_ahash_update(hash);
1393
1394                 data_length -= len;
1395                 sg = sg_next(sg);
1396         }
1397
1398         while (data_length) {
1399                 u32 cur_len = min_t(u32, data_length, sg->length);
1400
1401                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1402                 crypto_ahash_update(hash);
1403
1404                 data_length -= cur_len;
1405                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1406                 sg = sg_next(sg);
1407         }
1408
1409         if (padding) {
1410                 struct scatterlist pad_sg;
1411
1412                 sg_init_one(&pad_sg, pad_bytes, padding);
1413                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1414                                         padding);
1415                 crypto_ahash_finup(hash);
1416         } else {
1417                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1418                 crypto_ahash_final(hash);
1419         }
1420
1421         return data_crc;
1422 }
1423
1424 static void iscsit_do_crypto_hash_buf(
1425         struct ahash_request *hash,
1426         const void *buf,
1427         u32 payload_length,
1428         u32 padding,
1429         u8 *pad_bytes,
1430         u8 *data_crc)
1431 {
1432         struct scatterlist sg[2];
1433
1434         sg_init_table(sg, ARRAY_SIZE(sg));
1435         sg_set_buf(sg, buf, payload_length);
1436         if (padding)
1437                 sg_set_buf(sg + 1, pad_bytes, padding);
1438
1439         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1440
1441         crypto_ahash_digest(hash);
1442 }
1443
1444 int
1445 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1446                            struct iscsi_cmd *cmd, u32 payload_length,
1447                            bool *success)
1448 {
1449         struct iscsi_data *hdr = buf;
1450         struct se_cmd *se_cmd;
1451         int rc;
1452
1453         /* iSCSI write */
1454         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1455
1456         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1457                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1458                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1459                 payload_length, conn->cid);
1460
1461         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1462                 pr_err("Command ITT: 0x%08x received DataOUT after"
1463                         " last DataOUT received, dumping payload\n",
1464                         cmd->init_task_tag);
1465                 return iscsit_dump_data_payload(conn, payload_length, 1);
1466         }
1467
1468         if (cmd->data_direction != DMA_TO_DEVICE) {
1469                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1470                         " NON-WRITE command.\n", cmd->init_task_tag);
1471                 return iscsit_dump_data_payload(conn, payload_length, 1);
1472         }
1473         se_cmd = &cmd->se_cmd;
1474         iscsit_mod_dataout_timer(cmd);
1475
1476         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1477                 pr_err("DataOut Offset: %u, Length %u greater than"
1478                         " iSCSI Command EDTL %u, protocol error.\n",
1479                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1480                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1481         }
1482
1483         if (cmd->unsolicited_data) {
1484                 int dump_unsolicited_data = 0;
1485
1486                 if (conn->sess->sess_ops->InitialR2T) {
1487                         pr_err("Received unexpected unsolicited data"
1488                                 " while InitialR2T=Yes, protocol error.\n");
1489                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1490                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1491                         return -1;
1492                 }
1493                 /*
1494                  * Special case for dealing with Unsolicited DataOUT
1495                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1496                  * failures;
1497                  */
1498
1499                 /* Something's amiss if we're not in WRITE_PENDING state... */
1500                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1501                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1502                         dump_unsolicited_data = 1;
1503
1504                 if (dump_unsolicited_data) {
1505                         /*
1506                          * Check if a delayed TASK_ABORTED status needs to
1507                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1508                          * received with the unsolicited data out.
1509                          */
1510                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1511                                 iscsit_stop_dataout_timer(cmd);
1512
1513                         transport_check_aborted_status(se_cmd,
1514                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
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                                 if (--cmd->outstanding_r2ts < 1) {
1531                                         iscsit_stop_dataout_timer(cmd);
1532                                         transport_check_aborted_status(
1533                                                         se_cmd, 1);
1534                                 }
1535
1536                         return iscsit_dump_data_payload(conn, payload_length, 1);
1537                 }
1538         }
1539         /*
1540          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1541          * within-command recovery checks before receiving the payload.
1542          */
1543         rc = iscsit_check_pre_dataout(cmd, buf);
1544         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1545                 return 0;
1546         else if (rc == DATAOUT_CANNOT_RECOVER)
1547                 return -1;
1548         *success = true;
1549         return 0;
1550 }
1551 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1552
1553 int
1554 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1555                          struct iscsi_cmd **out_cmd)
1556 {
1557         struct iscsi_data *hdr = buf;
1558         struct iscsi_cmd *cmd;
1559         u32 payload_length = ntoh24(hdr->dlength);
1560         int rc;
1561         bool success = false;
1562
1563         if (!payload_length) {
1564                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1565                 return 0;
1566         }
1567
1568         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1569                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1570                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1571                         conn->conn_ops->MaxXmitDataSegmentLength);
1572                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1573         }
1574
1575         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1576         if (!cmd)
1577                 return 0;
1578
1579         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1580
1581         if (success)
1582                 *out_cmd = cmd;
1583
1584         return rc;
1585 }
1586 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1587
1588 static int
1589 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1590                    struct iscsi_data *hdr)
1591 {
1592         struct kvec *iov;
1593         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1594         u32 payload_length = ntoh24(hdr->dlength);
1595         int iov_ret, data_crc_failed = 0;
1596
1597         rx_size += payload_length;
1598         iov = &cmd->iov_data[0];
1599
1600         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1601                                    payload_length);
1602         if (iov_ret < 0)
1603                 return -1;
1604
1605         iov_count += iov_ret;
1606
1607         padding = ((-payload_length) & 3);
1608         if (padding != 0) {
1609                 iov[iov_count].iov_base = cmd->pad_bytes;
1610                 iov[iov_count++].iov_len = padding;
1611                 rx_size += padding;
1612                 pr_debug("Receiving %u padding bytes.\n", padding);
1613         }
1614
1615         if (conn->conn_ops->DataDigest) {
1616                 iov[iov_count].iov_base = &checksum;
1617                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1618                 rx_size += ISCSI_CRC_LEN;
1619         }
1620
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                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1887                 if (rx_got != rx_size) {
1888                         ret = -1;
1889                         goto out;
1890                 }
1891
1892                 if (conn->conn_ops->DataDigest) {
1893                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1894                                         ping_data, payload_length,
1895                                         padding, cmd->pad_bytes,
1896                                         (u8 *)&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
2019         target_get_sess_cmd(&cmd->se_cmd, true);
2020
2021         /*
2022          * TASK_REASSIGN for ERL=2 / connection stays inside of
2023          * LIO-Target $FABRIC_MOD
2024          */
2025         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2026                 tcm_function = iscsit_convert_tmf(function);
2027                 if (tcm_function == TMR_UNKNOWN) {
2028                         pr_err("Unknown iSCSI TMR Function:"
2029                                " 0x%02x\n", function);
2030                         return iscsit_add_reject_cmd(cmd,
2031                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2032                 }
2033         }
2034         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2035                                  GFP_KERNEL);
2036         if (ret < 0)
2037                 return iscsit_add_reject_cmd(cmd,
2038                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2039
2040         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2041
2042         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2043         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2044         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2045         cmd->init_task_tag      = hdr->itt;
2046         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2047         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2048         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2049         se_tmr                  = cmd->se_cmd.se_tmr_req;
2050         tmr_req                 = cmd->tmr_req;
2051         /*
2052          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2053          */
2054         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2055                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2056                                                scsilun_to_int(&hdr->lun));
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, 11) != 0) {
2207                 pr_err("Received Text Data that is not"
2208                         " SendTargets, cannot continue.\n");
2209                 goto reject;
2210         }
2211         text_ptr = strchr(text_in, '=');
2212         if (!text_ptr) {
2213                 pr_err("No \"=\" separator found in Text Data,"
2214                         "  cannot continue.\n");
2215                 goto reject;
2216         }
2217         if (!strncmp("=All", text_ptr, 4)) {
2218                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2219         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2220                    !strncmp("=eui.", text_ptr, 5)) {
2221                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2222         } else {
2223                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2224                 goto reject;
2225         }
2226
2227         spin_lock_bh(&conn->cmd_lock);
2228         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2229         spin_unlock_bh(&conn->cmd_lock);
2230
2231 empty_sendtargets:
2232         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2233
2234         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2235                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2236                                 (unsigned char *)hdr, hdr->cmdsn);
2237                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2238                         return -1;
2239
2240                 return 0;
2241         }
2242
2243         return iscsit_execute_cmd(cmd, 0);
2244
2245 reject:
2246         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2247                                  (unsigned char *)hdr);
2248 }
2249 EXPORT_SYMBOL(iscsit_process_text_cmd);
2250
2251 static int
2252 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2253                        unsigned char *buf)
2254 {
2255         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2256         char *text_in = NULL;
2257         u32 payload_length = ntoh24(hdr->dlength);
2258         int rx_size, rc;
2259
2260         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2261         if (rc < 0)
2262                 return 0;
2263
2264         rx_size = payload_length;
2265         if (payload_length) {
2266                 u32 checksum = 0, data_crc = 0;
2267                 u32 padding = 0, pad_bytes = 0;
2268                 int niov = 0, rx_got;
2269                 struct kvec iov[3];
2270
2271                 text_in = kzalloc(payload_length, GFP_KERNEL);
2272                 if (!text_in)
2273                         goto reject;
2274
2275                 cmd->text_in_ptr = text_in;
2276
2277                 memset(iov, 0, 3 * sizeof(struct kvec));
2278                 iov[niov].iov_base      = text_in;
2279                 iov[niov++].iov_len     = payload_length;
2280
2281                 padding = ((-payload_length) & 3);
2282                 if (padding != 0) {
2283                         iov[niov].iov_base = &pad_bytes;
2284                         iov[niov++].iov_len  = padding;
2285                         rx_size += padding;
2286                         pr_debug("Receiving %u additional bytes"
2287                                         " for padding.\n", padding);
2288                 }
2289                 if (conn->conn_ops->DataDigest) {
2290                         iov[niov].iov_base      = &checksum;
2291                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2292                         rx_size += ISCSI_CRC_LEN;
2293                 }
2294
2295                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2296                 if (rx_got != rx_size)
2297                         goto reject;
2298
2299                 if (conn->conn_ops->DataDigest) {
2300                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2301                                         text_in, payload_length,
2302                                         padding, (u8 *)&pad_bytes,
2303                                         (u8 *)&data_crc);
2304
2305                         if (checksum != data_crc) {
2306                                 pr_err("Text data CRC32C DataDigest"
2307                                         " 0x%08x does not match computed"
2308                                         " 0x%08x\n", checksum, data_crc);
2309                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2310                                         pr_err("Unable to recover from"
2311                                         " Text Data digest failure while in"
2312                                                 " ERL=0.\n");
2313                                         goto reject;
2314                                 } else {
2315                                         /*
2316                                          * Silently drop this PDU and let the
2317                                          * initiator plug the CmdSN gap.
2318                                          */
2319                                         pr_debug("Dropping Text"
2320                                         " Command CmdSN: 0x%08x due to"
2321                                         " DataCRC error.\n", hdr->cmdsn);
2322                                         kfree(text_in);
2323                                         return 0;
2324                                 }
2325                         } else {
2326                                 pr_debug("Got CRC32C DataDigest"
2327                                         " 0x%08x for %u bytes of text data.\n",
2328                                                 checksum, payload_length);
2329                         }
2330                 }
2331                 text_in[payload_length - 1] = '\0';
2332                 pr_debug("Successfully read %d bytes of text"
2333                                 " data.\n", payload_length);
2334         }
2335
2336         return iscsit_process_text_cmd(conn, cmd, hdr);
2337
2338 reject:
2339         kfree(cmd->text_in_ptr);
2340         cmd->text_in_ptr = NULL;
2341         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2342 }
2343
2344 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2345 {
2346         struct iscsi_conn *conn_p;
2347         struct iscsi_session *sess = conn->sess;
2348
2349         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2350                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2351
2352         atomic_set(&sess->session_logout, 1);
2353         atomic_set(&conn->conn_logout_remove, 1);
2354         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2355
2356         iscsit_inc_conn_usage_count(conn);
2357         iscsit_inc_session_usage_count(sess);
2358
2359         spin_lock_bh(&sess->conn_lock);
2360         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2361                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2362                         continue;
2363
2364                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2365                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2366         }
2367         spin_unlock_bh(&sess->conn_lock);
2368
2369         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2370
2371         return 0;
2372 }
2373
2374 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2375 {
2376         struct iscsi_conn *l_conn;
2377         struct iscsi_session *sess = conn->sess;
2378
2379         pr_debug("Received logout request CLOSECONNECTION for CID:"
2380                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2381
2382         /*
2383          * A Logout Request with a CLOSECONNECTION reason code for a CID
2384          * can arrive on a connection with a differing CID.
2385          */
2386         if (conn->cid == cmd->logout_cid) {
2387                 spin_lock_bh(&conn->state_lock);
2388                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2389                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2390
2391                 atomic_set(&conn->conn_logout_remove, 1);
2392                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2393                 iscsit_inc_conn_usage_count(conn);
2394
2395                 spin_unlock_bh(&conn->state_lock);
2396         } else {
2397                 /*
2398                  * Handle all different cid CLOSECONNECTION requests in
2399                  * iscsit_logout_post_handler_diffcid() as to give enough
2400                  * time for any non immediate command's CmdSN to be
2401                  * acknowledged on the connection in question.
2402                  *
2403                  * Here we simply make sure the CID is still around.
2404                  */
2405                 l_conn = iscsit_get_conn_from_cid(sess,
2406                                 cmd->logout_cid);
2407                 if (!l_conn) {
2408                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2409                         iscsit_add_cmd_to_response_queue(cmd, conn,
2410                                         cmd->i_state);
2411                         return 0;
2412                 }
2413
2414                 iscsit_dec_conn_usage_count(l_conn);
2415         }
2416
2417         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2418
2419         return 0;
2420 }
2421
2422 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2423 {
2424         struct iscsi_session *sess = conn->sess;
2425
2426         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2427                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2428
2429         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2430                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431                         " while ERL!=2.\n");
2432                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2433                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2434                 return 0;
2435         }
2436
2437         if (conn->cid == cmd->logout_cid) {
2438                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2439                         " with CID: %hu on CID: %hu, implementation error.\n",
2440                                 cmd->logout_cid, conn->cid);
2441                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2442                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2443                 return 0;
2444         }
2445
2446         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2447
2448         return 0;
2449 }
2450
2451 int
2452 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2453                         unsigned char *buf)
2454 {
2455         int cmdsn_ret, logout_remove = 0;
2456         u8 reason_code = 0;
2457         struct iscsi_logout *hdr;
2458         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2459
2460         hdr                     = (struct iscsi_logout *) buf;
2461         reason_code             = (hdr->flags & 0x7f);
2462
2463         if (tiqn) {
2464                 spin_lock(&tiqn->logout_stats.lock);
2465                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2466                         tiqn->logout_stats.normal_logouts++;
2467                 else
2468                         tiqn->logout_stats.abnormal_logouts++;
2469                 spin_unlock(&tiqn->logout_stats.lock);
2470         }
2471
2472         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2473                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2474                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2475                 hdr->cid, conn->cid);
2476
2477         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2478                 pr_err("Received logout request on connection that"
2479                         " is not in logged in state, ignoring request.\n");
2480                 iscsit_free_cmd(cmd, false);
2481                 return 0;
2482         }
2483
2484         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2485         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2486         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2487         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2488         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2489         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2490         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2491         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2492         cmd->logout_reason      = reason_code;
2493         cmd->data_direction     = DMA_NONE;
2494
2495         /*
2496          * We need to sleep in these cases (by returning 1) until the Logout
2497          * Response gets sent in the tx thread.
2498          */
2499         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2500            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2501             be16_to_cpu(hdr->cid) == conn->cid))
2502                 logout_remove = 1;
2503
2504         spin_lock_bh(&conn->cmd_lock);
2505         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2506         spin_unlock_bh(&conn->cmd_lock);
2507
2508         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2509                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2510
2511         /*
2512          * Immediate commands are executed, well, immediately.
2513          * Non-Immediate Logout Commands are executed in CmdSN order.
2514          */
2515         if (cmd->immediate_cmd) {
2516                 int ret = iscsit_execute_cmd(cmd, 0);
2517
2518                 if (ret < 0)
2519                         return ret;
2520         } else {
2521                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2522                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2523                         logout_remove = 0;
2524                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2525                         return -1;
2526         }
2527
2528         return logout_remove;
2529 }
2530 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2531
2532 int iscsit_handle_snack(
2533         struct iscsi_conn *conn,
2534         unsigned char *buf)
2535 {
2536         struct iscsi_snack *hdr;
2537
2538         hdr                     = (struct iscsi_snack *) buf;
2539         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2540
2541         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2542                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2543                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2544                         hdr->begrun, hdr->runlength, conn->cid);
2545
2546         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2547                 pr_err("Initiator sent SNACK request while in"
2548                         " ErrorRecoveryLevel=0.\n");
2549                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2550                                          buf);
2551         }
2552         /*
2553          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2554          * call from inside iscsi_send_recovery_datain_or_r2t().
2555          */
2556         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2557         case 0:
2558                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2559                         hdr->itt,
2560                         be32_to_cpu(hdr->ttt),
2561                         be32_to_cpu(hdr->begrun),
2562                         be32_to_cpu(hdr->runlength));
2563         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2564                 return iscsit_handle_status_snack(conn, hdr->itt,
2565                         be32_to_cpu(hdr->ttt),
2566                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2567         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2568                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2569                         be32_to_cpu(hdr->begrun),
2570                         be32_to_cpu(hdr->runlength));
2571         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2572                 /* FIXME: Support R-Data SNACK */
2573                 pr_err("R-Data SNACK Not Supported.\n");
2574                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2575                                          buf);
2576         default:
2577                 pr_err("Unknown SNACK type 0x%02x, protocol"
2578                         " error.\n", hdr->flags & 0x0f);
2579                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2580                                          buf);
2581         }
2582
2583         return 0;
2584 }
2585 EXPORT_SYMBOL(iscsit_handle_snack);
2586
2587 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2588 {
2589         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2590             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2591                 wait_for_completion_interruptible_timeout(
2592                                         &conn->rx_half_close_comp,
2593                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2594         }
2595 }
2596
2597 static int iscsit_handle_immediate_data(
2598         struct iscsi_cmd *cmd,
2599         struct iscsi_scsi_req *hdr,
2600         u32 length)
2601 {
2602         int iov_ret, rx_got = 0, rx_size = 0;
2603         u32 checksum, iov_count = 0, padding = 0;
2604         struct iscsi_conn *conn = cmd->conn;
2605         struct kvec *iov;
2606
2607         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2608         if (iov_ret < 0)
2609                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2610
2611         rx_size = length;
2612         iov_count = iov_ret;
2613         iov = &cmd->iov_data[0];
2614
2615         padding = ((-length) & 3);
2616         if (padding != 0) {
2617                 iov[iov_count].iov_base = cmd->pad_bytes;
2618                 iov[iov_count++].iov_len = padding;
2619                 rx_size += padding;
2620         }
2621
2622         if (conn->conn_ops->DataDigest) {
2623                 iov[iov_count].iov_base         = &checksum;
2624                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2625                 rx_size += ISCSI_CRC_LEN;
2626         }
2627
2628         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2629
2630         iscsit_unmap_iovec(cmd);
2631
2632         if (rx_got != rx_size) {
2633                 iscsit_rx_thread_wait_for_tcp(conn);
2634                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2635         }
2636
2637         if (conn->conn_ops->DataDigest) {
2638                 u32 data_crc;
2639
2640                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2641                                                     cmd->write_data_done, length, padding,
2642                                                     cmd->pad_bytes);
2643
2644                 if (checksum != data_crc) {
2645                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2646                                 " does not match computed 0x%08x\n", checksum,
2647                                 data_crc);
2648
2649                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2650                                 pr_err("Unable to recover from"
2651                                         " Immediate Data digest failure while"
2652                                         " in ERL=0.\n");
2653                                 iscsit_reject_cmd(cmd,
2654                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2655                                                 (unsigned char *)hdr);
2656                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2657                         } else {
2658                                 iscsit_reject_cmd(cmd,
2659                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2660                                                 (unsigned char *)hdr);
2661                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2662                         }
2663                 } else {
2664                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2665                                 " %u bytes of Immediate Data\n", checksum,
2666                                 length);
2667                 }
2668         }
2669
2670         cmd->write_data_done += length;
2671
2672         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2673                 spin_lock_bh(&cmd->istate_lock);
2674                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2675                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2676                 spin_unlock_bh(&cmd->istate_lock);
2677         }
2678
2679         return IMMEDIATE_DATA_NORMAL_OPERATION;
2680 }
2681
2682 /*
2683  *      Called with sess->conn_lock held.
2684  */
2685 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2686         with active network interface */
2687 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2688 {
2689         struct iscsi_cmd *cmd;
2690         struct iscsi_conn *conn_p;
2691         bool found = false;
2692
2693         /*
2694          * Only send a Asynchronous Message on connections whos network
2695          * interface is still functional.
2696          */
2697         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2698                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2699                         iscsit_inc_conn_usage_count(conn_p);
2700                         found = true;
2701                         break;
2702                 }
2703         }
2704
2705         if (!found)
2706                 return;
2707
2708         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2709         if (!cmd) {
2710                 iscsit_dec_conn_usage_count(conn_p);
2711                 return;
2712         }
2713
2714         cmd->logout_cid = conn->cid;
2715         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2716         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2717
2718         spin_lock_bh(&conn_p->cmd_lock);
2719         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2720         spin_unlock_bh(&conn_p->cmd_lock);
2721
2722         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2723         iscsit_dec_conn_usage_count(conn_p);
2724 }
2725
2726 static int iscsit_send_conn_drop_async_message(
2727         struct iscsi_cmd *cmd,
2728         struct iscsi_conn *conn)
2729 {
2730         struct iscsi_async *hdr;
2731
2732         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2733
2734         hdr                     = (struct iscsi_async *) cmd->pdu;
2735         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2736         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2737         cmd->init_task_tag      = RESERVED_ITT;
2738         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2739         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2740         cmd->stat_sn            = conn->stat_sn++;
2741         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2742         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2743         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2744         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2745         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2746         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2747         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2748
2749         pr_debug("Sending Connection Dropped Async Message StatSN:"
2750                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2751                         cmd->logout_cid, conn->cid);
2752
2753         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2754 }
2755
2756 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2757 {
2758         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2759             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2760                 wait_for_completion_interruptible_timeout(
2761                                         &conn->tx_half_close_comp,
2762                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2763         }
2764 }
2765
2766 void
2767 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2768                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2769                         bool set_statsn)
2770 {
2771         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2772         hdr->flags              = datain->flags;
2773         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2774                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2775                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2776                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2777                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2778                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2779                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2780                 }
2781         }
2782         hton24(hdr->dlength, datain->length);
2783         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2784                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2785                                 (struct scsi_lun *)&hdr->lun);
2786         else
2787                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2788
2789         hdr->itt                = cmd->init_task_tag;
2790
2791         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2792                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2793         else
2794                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2795         if (set_statsn)
2796                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2797         else
2798                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2799
2800         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2801         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2802         hdr->datasn             = cpu_to_be32(datain->data_sn);
2803         hdr->offset             = cpu_to_be32(datain->offset);
2804
2805         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2806                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2807                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2808                 ntohl(hdr->offset), datain->length, conn->cid);
2809 }
2810 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2811
2812 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2813 {
2814         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2815         struct iscsi_datain datain;
2816         struct iscsi_datain_req *dr;
2817         int eodr = 0, ret;
2818         bool set_statsn = false;
2819
2820         memset(&datain, 0, sizeof(struct iscsi_datain));
2821         dr = iscsit_get_datain_values(cmd, &datain);
2822         if (!dr) {
2823                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2824                                 cmd->init_task_tag);
2825                 return -1;
2826         }
2827         /*
2828          * Be paranoid and double check the logic for now.
2829          */
2830         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2831                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2832                         " datain.length: %u exceeds cmd->data_length: %u\n",
2833                         cmd->init_task_tag, datain.offset, datain.length,
2834                         cmd->se_cmd.data_length);
2835                 return -1;
2836         }
2837
2838         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2839         /*
2840          * Special case for successfully execution w/ both DATAIN
2841          * and Sense Data.
2842          */
2843         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2844             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2845                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2846         else {
2847                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2848                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2849                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2850                         cmd->stat_sn = conn->stat_sn++;
2851                         set_statsn = true;
2852                 } else if (dr->dr_complete ==
2853                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2854                         set_statsn = true;
2855         }
2856
2857         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2858
2859         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2860         if (ret < 0)
2861                 return ret;
2862
2863         if (dr->dr_complete) {
2864                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2865                                 2 : 1;
2866                 iscsit_free_datain_req(cmd, dr);
2867         }
2868
2869         return eodr;
2870 }
2871
2872 int
2873 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2874                         struct iscsi_logout_rsp *hdr)
2875 {
2876         struct iscsi_conn *logout_conn = NULL;
2877         struct iscsi_conn_recovery *cr = NULL;
2878         struct iscsi_session *sess = conn->sess;
2879         /*
2880          * The actual shutting down of Sessions and/or Connections
2881          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2882          * is done in scsi_logout_post_handler().
2883          */
2884         switch (cmd->logout_reason) {
2885         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2886                 pr_debug("iSCSI session logout successful, setting"
2887                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2888                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889                 break;
2890         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2891                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2892                         break;
2893                 /*
2894                  * For CLOSECONNECTION logout requests carrying
2895                  * a matching logout CID -> local CID, the reference
2896                  * for the local CID will have been incremented in
2897                  * iscsi_logout_closeconnection().
2898                  *
2899                  * For CLOSECONNECTION logout requests carrying
2900                  * a different CID than the connection it arrived
2901                  * on, the connection responding to cmd->logout_cid
2902                  * is stopped in iscsit_logout_post_handler_diffcid().
2903                  */
2904
2905                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2906                         " successful.\n", cmd->logout_cid, conn->cid);
2907                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2908                 break;
2909         case ISCSI_LOGOUT_REASON_RECOVERY:
2910                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2911                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2912                         break;
2913                 /*
2914                  * If the connection is still active from our point of view
2915                  * force connection recovery to occur.
2916                  */
2917                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2918                                 cmd->logout_cid);
2919                 if (logout_conn) {
2920                         iscsit_connection_reinstatement_rcfr(logout_conn);
2921                         iscsit_dec_conn_usage_count(logout_conn);
2922                 }
2923
2924                 cr = iscsit_get_inactive_connection_recovery_entry(
2925                                 conn->sess, cmd->logout_cid);
2926                 if (!cr) {
2927                         pr_err("Unable to locate CID: %hu for"
2928                         " REMOVECONNFORRECOVERY Logout Request.\n",
2929                                 cmd->logout_cid);
2930                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2931                         break;
2932                 }
2933
2934                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2935
2936                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2937                         " for recovery for CID: %hu on CID: %hu successful.\n",
2938                                 cmd->logout_cid, conn->cid);
2939                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2940                 break;
2941         default:
2942                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2943                                 cmd->logout_reason);
2944                 return -1;
2945         }
2946
2947         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2948         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2949         hdr->response           = cmd->logout_response;
2950         hdr->itt                = cmd->init_task_tag;
2951         cmd->stat_sn            = conn->stat_sn++;
2952         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2953
2954         iscsit_increment_maxcmdsn(cmd, conn->sess);
2955         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2956         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2957
2958         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2959                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2960                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2961                 cmd->logout_cid, conn->cid);
2962
2963         return 0;
2964 }
2965 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2966
2967 static int
2968 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2969 {
2970         int rc;
2971
2972         rc = iscsit_build_logout_rsp(cmd, conn,
2973                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2974         if (rc < 0)
2975                 return rc;
2976
2977         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2978 }
2979
2980 void
2981 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2982                        struct iscsi_nopin *hdr, bool nopout_response)
2983 {
2984         hdr->opcode             = ISCSI_OP_NOOP_IN;
2985         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2986         hton24(hdr->dlength, cmd->buf_ptr_size);
2987         if (nopout_response)
2988                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2989         hdr->itt                = cmd->init_task_tag;
2990         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2991         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2992                                   conn->stat_sn;
2993         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2994
2995         if (nopout_response)
2996                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2997
2998         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2999         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3000
3001         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3002                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3003                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3004                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3005 }
3006 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3007
3008 /*
3009  *      Unsolicited NOPIN, either requesting a response or not.
3010  */
3011 static int iscsit_send_unsolicited_nopin(
3012         struct iscsi_cmd *cmd,
3013         struct iscsi_conn *conn,
3014         int want_response)
3015 {
3016         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3017         int ret;
3018
3019         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3020
3021         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3022                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3023
3024         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3025         if (ret < 0)
3026                 return ret;
3027
3028         spin_lock_bh(&cmd->istate_lock);
3029         cmd->i_state = want_response ?
3030                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3031         spin_unlock_bh(&cmd->istate_lock);
3032
3033         return 0;
3034 }
3035
3036 static int
3037 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3038 {
3039         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3040
3041         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3042
3043         /*
3044          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3045          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3046          */
3047         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3048
3049         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3050                                                      cmd->buf_ptr,
3051                                                      cmd->buf_ptr_size);
3052 }
3053
3054 static int iscsit_send_r2t(
3055         struct iscsi_cmd *cmd,
3056         struct iscsi_conn *conn)
3057 {
3058         struct iscsi_r2t *r2t;
3059         struct iscsi_r2t_rsp *hdr;
3060         int ret;
3061
3062         r2t = iscsit_get_r2t_from_list(cmd);
3063         if (!r2t)
3064                 return -1;
3065
3066         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3067         memset(hdr, 0, ISCSI_HDR_LEN);
3068         hdr->opcode             = ISCSI_OP_R2T;
3069         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3070         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3071                         (struct scsi_lun *)&hdr->lun);
3072         hdr->itt                = cmd->init_task_tag;
3073         if (conn->conn_transport->iscsit_get_r2t_ttt)
3074                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3075         else
3076                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3077         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3078         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3079         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3080         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3081         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3082         hdr->data_offset        = cpu_to_be32(r2t->offset);
3083         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3084
3085         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3086                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3087                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3088                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3089                         r2t->offset, r2t->xfer_len, conn->cid);
3090
3091         spin_lock_bh(&cmd->r2t_lock);
3092         r2t->sent_r2t = 1;
3093         spin_unlock_bh(&cmd->r2t_lock);
3094
3095         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3096         if (ret < 0) {
3097                 return ret;
3098         }
3099
3100         spin_lock_bh(&cmd->dataout_timeout_lock);
3101         iscsit_start_dataout_timer(cmd, conn);
3102         spin_unlock_bh(&cmd->dataout_timeout_lock);
3103
3104         return 0;
3105 }
3106
3107 /*
3108  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3109  *              connection recovery.
3110  */
3111 int iscsit_build_r2ts_for_cmd(
3112         struct iscsi_conn *conn,
3113         struct iscsi_cmd *cmd,
3114         bool recovery)
3115 {
3116         int first_r2t = 1;
3117         u32 offset = 0, xfer_len = 0;
3118
3119         spin_lock_bh(&cmd->r2t_lock);
3120         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3121                 spin_unlock_bh(&cmd->r2t_lock);
3122                 return 0;
3123         }
3124
3125         if (conn->sess->sess_ops->DataSequenceInOrder &&
3126             !recovery)
3127                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3128
3129         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3130                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3131                         offset = cmd->r2t_offset;
3132
3133                         if (first_r2t && recovery) {
3134                                 int new_data_end = offset +
3135                                         conn->sess->sess_ops->MaxBurstLength -
3136                                         cmd->next_burst_len;
3137
3138                                 if (new_data_end > cmd->se_cmd.data_length)
3139                                         xfer_len = cmd->se_cmd.data_length - offset;
3140                                 else
3141                                         xfer_len =
3142                                                 conn->sess->sess_ops->MaxBurstLength -
3143                                                 cmd->next_burst_len;
3144                         } else {
3145                                 int new_data_end = offset +
3146                                         conn->sess->sess_ops->MaxBurstLength;
3147
3148                                 if (new_data_end > cmd->se_cmd.data_length)
3149                                         xfer_len = cmd->se_cmd.data_length - offset;
3150                                 else
3151                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3152                         }
3153                         cmd->r2t_offset += xfer_len;
3154
3155                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3156                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157                 } else {
3158                         struct iscsi_seq *seq;
3159
3160                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3161                         if (!seq) {
3162                                 spin_unlock_bh(&cmd->r2t_lock);
3163                                 return -1;
3164                         }
3165
3166                         offset = seq->offset;
3167                         xfer_len = seq->xfer_len;
3168
3169                         if (cmd->seq_send_order == cmd->seq_count)
3170                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3171                 }
3172                 cmd->outstanding_r2ts++;
3173                 first_r2t = 0;
3174
3175                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3176                         spin_unlock_bh(&cmd->r2t_lock);
3177                         return -1;
3178                 }
3179
3180                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3181                         break;
3182         }
3183         spin_unlock_bh(&cmd->r2t_lock);
3184
3185         return 0;
3186 }
3187 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3188
3189 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3190                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3191 {
3192         if (inc_stat_sn)
3193                 cmd->stat_sn = conn->stat_sn++;
3194
3195         atomic_long_inc(&conn->sess->rsp_pdus);
3196
3197         memset(hdr, 0, ISCSI_HDR_LEN);
3198         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3199         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3200         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3201                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3202                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3203         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3204                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3205                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3206         }
3207         hdr->response           = cmd->iscsi_response;
3208         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3209         hdr->itt                = cmd->init_task_tag;
3210         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3211
3212         iscsit_increment_maxcmdsn(cmd, conn->sess);
3213         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3214         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3215
3216         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3217                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3218                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3219                 cmd->se_cmd.scsi_status, conn->cid);
3220 }
3221 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3222
3223 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3224 {
3225         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3226         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3227         void *data_buf = NULL;
3228         u32 padding = 0, data_buf_len = 0;
3229
3230         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3231
3232         /*
3233          * Attach SENSE DATA payload to iSCSI Response PDU
3234          */
3235         if (cmd->se_cmd.sense_buffer &&
3236            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3237             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3238                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3239                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3240
3241                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3242                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3243                 data_buf = cmd->sense_buffer;
3244                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3245
3246                 if (padding) {
3247                         memset(cmd->sense_buffer +
3248                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3249                         pr_debug("Adding %u bytes of padding to"
3250                                 " SENSE.\n", padding);
3251                 }
3252
3253                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3254                                 " Response PDU\n",
3255                                 cmd->se_cmd.scsi_sense_length);
3256         }
3257
3258         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3259                                                      data_buf_len);
3260 }
3261
3262 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3263 {
3264         switch (se_tmr->response) {
3265         case TMR_FUNCTION_COMPLETE:
3266                 return ISCSI_TMF_RSP_COMPLETE;
3267         case TMR_TASK_DOES_NOT_EXIST:
3268                 return ISCSI_TMF_RSP_NO_TASK;
3269         case TMR_LUN_DOES_NOT_EXIST:
3270                 return ISCSI_TMF_RSP_NO_LUN;
3271         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3272                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3273         case TMR_FUNCTION_REJECTED:
3274         default:
3275                 return ISCSI_TMF_RSP_REJECTED;
3276         }
3277 }
3278
3279 void
3280 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3281                           struct iscsi_tm_rsp *hdr)
3282 {
3283         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3284
3285         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3286         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3287         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3288         hdr->itt                = cmd->init_task_tag;
3289         cmd->stat_sn            = conn->stat_sn++;
3290         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3291
3292         iscsit_increment_maxcmdsn(cmd, conn->sess);
3293         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3294         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3295
3296         pr_debug("Built Task Management Response ITT: 0x%08x,"
3297                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3298                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3299 }
3300 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3301
3302 static int
3303 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3304 {
3305         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3306
3307         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3308
3309         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3310 }
3311
3312 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3313 {
3314         bool ret = false;
3315
3316         if (np->np_sockaddr.ss_family == AF_INET6) {
3317                 const struct sockaddr_in6 sin6 = {
3318                         .sin6_addr = IN6ADDR_ANY_INIT };
3319                 struct sockaddr_in6 *sock_in6 =
3320                          (struct sockaddr_in6 *)&np->np_sockaddr;
3321
3322                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3323                                 sin6.sin6_addr.s6_addr, 16))
3324                         ret = true;
3325         } else {
3326                 struct sockaddr_in * sock_in =
3327                         (struct sockaddr_in *)&np->np_sockaddr;
3328
3329                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3330                         ret = true;
3331         }
3332
3333         return ret;
3334 }
3335
3336 #define SENDTARGETS_BUF_LIMIT 32768U
3337
3338 static int
3339 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3340                                   enum iscsit_transport_type network_transport,
3341                                   int skip_bytes, bool *completed)
3342 {
3343         char *payload = NULL;
3344         struct iscsi_conn *conn = cmd->conn;
3345         struct iscsi_portal_group *tpg;
3346         struct iscsi_tiqn *tiqn;
3347         struct iscsi_tpg_np *tpg_np;
3348         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3349         int target_name_printed;
3350         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3351         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3352         bool active;
3353
3354         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3355                          SENDTARGETS_BUF_LIMIT);
3356
3357         payload = kzalloc(buffer_len, GFP_KERNEL);
3358         if (!payload)
3359                 return -ENOMEM;
3360
3361         /*
3362          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3363          * explicit case..
3364          */
3365         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3366                 text_ptr = strchr(text_in, '=');
3367                 if (!text_ptr) {
3368                         pr_err("Unable to locate '=' string in text_in:"
3369                                " %s\n", text_in);
3370                         kfree(payload);
3371                         return -EINVAL;
3372                 }
3373                 /*
3374                  * Skip over '=' character..
3375                  */
3376                 text_ptr += 1;
3377         }
3378
3379         spin_lock(&tiqn_lock);
3380         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3381                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3382                      strcmp(tiqn->tiqn, text_ptr)) {
3383                         continue;
3384                 }
3385
3386                 target_name_printed = 0;
3387
3388                 spin_lock(&tiqn->tiqn_tpg_lock);
3389                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3390
3391                         /* If demo_mode_discovery=0 and generate_node_acls=0
3392                          * (demo mode dislabed) do not return
3393                          * TargetName+TargetAddress unless a NodeACL exists.
3394                          */
3395
3396                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3397                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3398                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3399                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3400                                 continue;
3401                         }
3402
3403                         spin_lock(&tpg->tpg_state_lock);
3404                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3405                         spin_unlock(&tpg->tpg_state_lock);
3406
3407                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3408                                 continue;
3409
3410                         spin_lock(&tpg->tpg_np_lock);
3411                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3412                                                 tpg_np_list) {
3413                                 struct iscsi_np *np = tpg_np->tpg_np;
3414                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3415                                 struct sockaddr_storage *sockaddr;
3416
3417                                 if (np->np_network_transport != network_transport)
3418                                         continue;
3419
3420                                 if (!target_name_printed) {
3421                                         len = sprintf(buf, "TargetName=%s",
3422                                                       tiqn->tiqn);
3423                                         len += 1;
3424
3425                                         if ((len + payload_len) > buffer_len) {
3426                                                 spin_unlock(&tpg->tpg_np_lock);
3427                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3428                                                 end_of_buf = 1;
3429                                                 goto eob;
3430                                         }
3431
3432                                         if (skip_bytes && len <= skip_bytes) {
3433                                                 skip_bytes -= len;
3434                                         } else {
3435                                                 memcpy(payload + payload_len, buf, len);
3436                                                 payload_len += len;
3437                                                 target_name_printed = 1;
3438                                                 if (len > skip_bytes)
3439                                                         skip_bytes = 0;
3440                                         }
3441                                 }
3442
3443                                 if (inaddr_any)
3444                                         sockaddr = &conn->local_sockaddr;
3445                                 else
3446                                         sockaddr = &np->np_sockaddr;
3447
3448                                 len = sprintf(buf, "TargetAddress="
3449                                               "%pISpc,%hu",
3450                                               sockaddr,
3451                                               tpg->tpgt);
3452                                 len += 1;
3453
3454                                 if ((len + payload_len) > buffer_len) {
3455                                         spin_unlock(&tpg->tpg_np_lock);
3456                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3457                                         end_of_buf = 1;
3458                                         goto eob;
3459                                 }
3460
3461                                 if (skip_bytes && len <= skip_bytes) {
3462                                         skip_bytes -= len;
3463                                 } else {
3464                                         memcpy(payload + payload_len, buf, len);
3465                                         payload_len += len;
3466                                         if (len > skip_bytes)
3467                                                 skip_bytes = 0;
3468                                 }
3469                         }
3470                         spin_unlock(&tpg->tpg_np_lock);
3471                 }
3472                 spin_unlock(&tiqn->tiqn_tpg_lock);
3473 eob:
3474                 if (end_of_buf) {
3475                         *completed = false;
3476                         break;
3477                 }
3478
3479                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3480                         break;
3481         }
3482         spin_unlock(&tiqn_lock);
3483
3484         cmd->buf_ptr = payload;
3485
3486         return payload_len;
3487 }
3488
3489 int
3490 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3491                       struct iscsi_text_rsp *hdr,
3492                       enum iscsit_transport_type network_transport)
3493 {
3494         int text_length, padding;
3495         bool completed = true;
3496
3497         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3498                                                         cmd->read_data_done,
3499                                                         &completed);
3500         if (text_length < 0)
3501                 return text_length;
3502
3503         if (completed) {
3504                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3505         } else {
3506                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3507                 cmd->read_data_done += text_length;
3508                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3509                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3510         }
3511         hdr->opcode = ISCSI_OP_TEXT_RSP;
3512         padding = ((-text_length) & 3);
3513         hton24(hdr->dlength, text_length);
3514         hdr->itt = cmd->init_task_tag;
3515         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3516         cmd->stat_sn = conn->stat_sn++;
3517         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3518
3519         iscsit_increment_maxcmdsn(cmd, conn->sess);
3520         /*
3521          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3522          * correctly increment MaxCmdSN for each response answering a
3523          * non immediate text request with a valid CmdSN.
3524          */
3525         cmd->maxcmdsn_inc = 0;
3526         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3527         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3528
3529         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3530                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3531                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3532                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3533                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3534
3535         return text_length + padding;
3536 }
3537 EXPORT_SYMBOL(iscsit_build_text_rsp);
3538
3539 static int iscsit_send_text_rsp(
3540         struct iscsi_cmd *cmd,
3541         struct iscsi_conn *conn)
3542 {
3543         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3544         int text_length;
3545
3546         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3547                                 conn->conn_transport->transport_type);
3548         if (text_length < 0)
3549                 return text_length;
3550
3551         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3552                                                      cmd->buf_ptr,
3553                                                      text_length);
3554 }
3555
3556 void
3557 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3558                     struct iscsi_reject *hdr)
3559 {
3560         hdr->opcode             = ISCSI_OP_REJECT;
3561         hdr->reason             = cmd->reject_reason;
3562         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3563         hton24(hdr->dlength, ISCSI_HDR_LEN);
3564         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3565         cmd->stat_sn            = conn->stat_sn++;
3566         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3567         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3568         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3569
3570 }
3571 EXPORT_SYMBOL(iscsit_build_reject);
3572
3573 static int iscsit_send_reject(
3574         struct iscsi_cmd *cmd,
3575         struct iscsi_conn *conn)
3576 {
3577         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3578
3579         iscsit_build_reject(cmd, conn, hdr);
3580
3581         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3582                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3583
3584         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3585                                                      cmd->buf_ptr,
3586                                                      ISCSI_HDR_LEN);
3587 }
3588
3589 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3590 {
3591         int ord, cpu;
3592         /*
3593          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3594          * within iscsit_start_kthreads()
3595          *
3596          * Here we use bitmap_id to determine which CPU that this
3597          * iSCSI connection's RX/TX threads will be scheduled to
3598          * execute upon.
3599          */
3600         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3601         for_each_online_cpu(cpu) {
3602                 if (ord-- == 0) {
3603                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3604                         return;
3605                 }
3606         }
3607         /*
3608          * This should never be reached..
3609          */
3610         dump_stack();
3611         cpumask_setall(conn->conn_cpumask);
3612 }
3613
3614 int
3615 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3616 {
3617         int ret;
3618
3619         switch (state) {
3620         case ISTATE_SEND_R2T:
3621                 ret = iscsit_send_r2t(cmd, conn);
3622                 if (ret < 0)
3623                         goto err;
3624                 break;
3625         case ISTATE_REMOVE:
3626                 spin_lock_bh(&conn->cmd_lock);
3627                 list_del_init(&cmd->i_conn_node);
3628                 spin_unlock_bh(&conn->cmd_lock);
3629
3630                 iscsit_free_cmd(cmd, false);
3631                 break;
3632         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3633                 iscsit_mod_nopin_response_timer(conn);
3634                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3635                 if (ret < 0)
3636                         goto err;
3637                 break;
3638         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3639                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3640                 if (ret < 0)
3641                         goto err;
3642                 break;
3643         default:
3644                 pr_err("Unknown Opcode: 0x%02x ITT:"
3645                        " 0x%08x, i_state: %d on CID: %hu\n",
3646                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3647                        conn->cid);
3648                 goto err;
3649         }
3650
3651         return 0;
3652
3653 err:
3654         return -1;
3655 }
3656 EXPORT_SYMBOL(iscsit_immediate_queue);
3657
3658 static int
3659 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3660 {
3661         struct iscsit_transport *t = conn->conn_transport;
3662         struct iscsi_queue_req *qr;
3663         struct iscsi_cmd *cmd;
3664         u8 state;
3665         int ret;
3666
3667         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3668                 atomic_set(&conn->check_immediate_queue, 0);
3669                 cmd = qr->cmd;
3670                 state = qr->state;
3671                 kmem_cache_free(lio_qr_cache, qr);
3672
3673                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3674                 if (ret < 0)
3675                         return ret;
3676         }
3677
3678         return 0;
3679 }
3680
3681 int
3682 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3683 {
3684         int ret;
3685
3686 check_rsp_state:
3687         switch (state) {
3688         case ISTATE_SEND_DATAIN:
3689                 ret = iscsit_send_datain(cmd, conn);
3690                 if (ret < 0)
3691                         goto err;
3692                 else if (!ret)
3693                         /* more drs */
3694                         goto check_rsp_state;
3695                 else if (ret == 1) {
3696                         /* all done */
3697                         spin_lock_bh(&cmd->istate_lock);
3698                         cmd->i_state = ISTATE_SENT_STATUS;
3699                         spin_unlock_bh(&cmd->istate_lock);
3700
3701                         if (atomic_read(&conn->check_immediate_queue))
3702                                 return 1;
3703
3704                         return 0;
3705                 } else if (ret == 2) {
3706                         /* Still must send status,
3707                            SCF_TRANSPORT_TASK_SENSE was set */
3708                         spin_lock_bh(&cmd->istate_lock);
3709                         cmd->i_state = ISTATE_SEND_STATUS;
3710                         spin_unlock_bh(&cmd->istate_lock);
3711                         state = ISTATE_SEND_STATUS;
3712                         goto check_rsp_state;
3713                 }
3714
3715                 break;
3716         case ISTATE_SEND_STATUS:
3717         case ISTATE_SEND_STATUS_RECOVERY:
3718                 ret = iscsit_send_response(cmd, conn);
3719                 break;
3720         case ISTATE_SEND_LOGOUTRSP:
3721                 ret = iscsit_send_logout(cmd, conn);
3722                 break;
3723         case ISTATE_SEND_ASYNCMSG:
3724                 ret = iscsit_send_conn_drop_async_message(
3725                         cmd, conn);
3726                 break;
3727         case ISTATE_SEND_NOPIN:
3728                 ret = iscsit_send_nopin(cmd, conn);
3729                 break;
3730         case ISTATE_SEND_REJECT:
3731                 ret = iscsit_send_reject(cmd, conn);
3732                 break;
3733         case ISTATE_SEND_TASKMGTRSP:
3734                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3735                 if (ret != 0)
3736                         break;
3737                 ret = iscsit_tmr_post_handler(cmd, conn);
3738                 if (ret != 0)
3739                         iscsit_fall_back_to_erl0(conn->sess);
3740                 break;
3741         case ISTATE_SEND_TEXTRSP:
3742                 ret = iscsit_send_text_rsp(cmd, conn);
3743                 break;
3744         default:
3745                 pr_err("Unknown Opcode: 0x%02x ITT:"
3746                        " 0x%08x, i_state: %d on CID: %hu\n",
3747                        cmd->iscsi_opcode, cmd->init_task_tag,
3748                        state, conn->cid);
3749                 goto err;
3750         }
3751         if (ret < 0)
3752                 goto err;
3753
3754         switch (state) {
3755         case ISTATE_SEND_LOGOUTRSP:
3756                 if (!iscsit_logout_post_handler(cmd, conn))
3757                         return -ECONNRESET;
3758                 /* fall through */
3759         case ISTATE_SEND_STATUS:
3760         case ISTATE_SEND_ASYNCMSG:
3761         case ISTATE_SEND_NOPIN:
3762         case ISTATE_SEND_STATUS_RECOVERY:
3763         case ISTATE_SEND_TEXTRSP:
3764         case ISTATE_SEND_TASKMGTRSP:
3765         case ISTATE_SEND_REJECT:
3766                 spin_lock_bh(&cmd->istate_lock);
3767                 cmd->i_state = ISTATE_SENT_STATUS;
3768                 spin_unlock_bh(&cmd->istate_lock);
3769                 break;
3770         default:
3771                 pr_err("Unknown Opcode: 0x%02x ITT:"
3772                        " 0x%08x, i_state: %d on CID: %hu\n",
3773                        cmd->iscsi_opcode, cmd->init_task_tag,
3774                        cmd->i_state, conn->cid);
3775                 goto err;
3776         }
3777
3778         if (atomic_read(&conn->check_immediate_queue))
3779                 return 1;
3780
3781         return 0;
3782
3783 err:
3784         return -1;
3785 }
3786 EXPORT_SYMBOL(iscsit_response_queue);
3787
3788 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3789 {
3790         struct iscsit_transport *t = conn->conn_transport;
3791         struct iscsi_queue_req *qr;
3792         struct iscsi_cmd *cmd;
3793         u8 state;
3794         int ret;
3795
3796         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3797                 cmd = qr->cmd;
3798                 state = qr->state;
3799                 kmem_cache_free(lio_qr_cache, qr);
3800
3801                 ret = t->iscsit_response_queue(conn, cmd, state);
3802                 if (ret == 1 || ret < 0)
3803                         return ret;
3804         }
3805
3806         return 0;
3807 }
3808
3809 int iscsi_target_tx_thread(void *arg)
3810 {
3811         int ret = 0;
3812         struct iscsi_conn *conn = arg;
3813         bool conn_freed = false;
3814
3815         /*
3816          * Allow ourselves to be interrupted by SIGINT so that a
3817          * connection recovery / failure event can be triggered externally.
3818          */
3819         allow_signal(SIGINT);
3820
3821         while (!kthread_should_stop()) {
3822                 /*
3823                  * Ensure that both TX and RX per connection kthreads
3824                  * are scheduled to run on the same CPU.
3825                  */
3826                 iscsit_thread_check_cpumask(conn, current, 1);
3827
3828                 wait_event_interruptible(conn->queues_wq,
3829                                          !iscsit_conn_all_queues_empty(conn));
3830
3831                 if (signal_pending(current))
3832                         goto transport_err;
3833
3834 get_immediate:
3835                 ret = iscsit_handle_immediate_queue(conn);
3836                 if (ret < 0)
3837                         goto transport_err;
3838
3839                 ret = iscsit_handle_response_queue(conn);
3840                 if (ret == 1) {
3841                         goto get_immediate;
3842                 } else if (ret == -ECONNRESET) {
3843                         conn_freed = true;
3844                         goto out;
3845                 } else if (ret < 0) {
3846                         goto transport_err;
3847                 }
3848         }
3849
3850 transport_err:
3851         /*
3852          * Avoid the normal connection failure code-path if this connection
3853          * is still within LOGIN mode, and iscsi_np process context is
3854          * responsible for cleaning up the early connection failure.
3855          */
3856         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3857                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3858 out:
3859         if (!conn_freed) {
3860                 while (!kthread_should_stop()) {
3861                         msleep(100);
3862                 }
3863         }
3864         return 0;
3865 }
3866
3867 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3868 {
3869         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3870         struct iscsi_cmd *cmd;
3871         int ret = 0;
3872
3873         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3874         case ISCSI_OP_SCSI_CMD:
3875                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3876                 if (!cmd)
3877                         goto reject;
3878
3879                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3880                 break;
3881         case ISCSI_OP_SCSI_DATA_OUT:
3882                 ret = iscsit_handle_data_out(conn, buf);
3883                 break;
3884         case ISCSI_OP_NOOP_OUT:
3885                 cmd = NULL;
3886                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3887                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3888                         if (!cmd)
3889                                 goto reject;
3890                 }
3891                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3892                 break;
3893         case ISCSI_OP_SCSI_TMFUNC:
3894                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3895                 if (!cmd)
3896                         goto reject;
3897
3898                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3899                 break;
3900         case ISCSI_OP_TEXT:
3901                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3902                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3903                         if (!cmd)
3904                                 goto reject;
3905                 } else {
3906                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3907                         if (!cmd)
3908                                 goto reject;
3909                 }
3910
3911                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3912                 break;
3913         case ISCSI_OP_LOGOUT:
3914                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3915                 if (!cmd)
3916                         goto reject;
3917
3918                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3919                 if (ret > 0)
3920                         wait_for_completion_timeout(&conn->conn_logout_comp,
3921                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3922                 break;
3923         case ISCSI_OP_SNACK:
3924                 ret = iscsit_handle_snack(conn, buf);
3925                 break;
3926         default:
3927                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3928                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3929                         pr_err("Cannot recover from unknown"
3930                         " opcode while ERL=0, closing iSCSI connection.\n");
3931                         return -1;
3932                 }
3933                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3934                        " closing iSCSI connection.\n");
3935                 ret = -1;
3936                 break;
3937         }
3938
3939         return ret;
3940 reject:
3941         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3942 }
3943
3944 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3945 {
3946         bool ret;
3947
3948         spin_lock_bh(&conn->state_lock);
3949         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3950         spin_unlock_bh(&conn->state_lock);
3951
3952         return ret;
3953 }
3954
3955 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3956 {
3957         int ret;
3958         u8 *buffer, opcode;
3959         u32 checksum = 0, digest = 0;
3960         struct kvec iov;
3961
3962         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3963         if (!buffer)
3964                 return;
3965
3966         while (!kthread_should_stop()) {
3967                 /*
3968                  * Ensure that both TX and RX per connection kthreads
3969                  * are scheduled to run on the same CPU.
3970                  */
3971                 iscsit_thread_check_cpumask(conn, current, 0);
3972
3973                 memset(&iov, 0, sizeof(struct kvec));
3974
3975                 iov.iov_base    = buffer;
3976                 iov.iov_len     = ISCSI_HDR_LEN;
3977
3978                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3979                 if (ret != ISCSI_HDR_LEN) {
3980                         iscsit_rx_thread_wait_for_tcp(conn);
3981                         break;
3982                 }
3983
3984                 if (conn->conn_ops->HeaderDigest) {
3985                         iov.iov_base    = &digest;
3986                         iov.iov_len     = ISCSI_CRC_LEN;
3987
3988                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3989                         if (ret != ISCSI_CRC_LEN) {
3990                                 iscsit_rx_thread_wait_for_tcp(conn);
3991                                 break;
3992                         }
3993
3994                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3995                                         buffer, ISCSI_HDR_LEN,
3996                                         0, NULL, (u8 *)&checksum);
3997
3998                         if (digest != checksum) {
3999                                 pr_err("HeaderDigest CRC32C failed,"
4000                                         " received 0x%08x, computed 0x%08x\n",
4001                                         digest, checksum);
4002                                 /*
4003                                  * Set the PDU to 0xff so it will intentionally
4004                                  * hit default in the switch below.
4005                                  */
4006                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4007                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4008                         } else {
4009                                 pr_debug("Got HeaderDigest CRC32C"
4010                                                 " 0x%08x\n", checksum);
4011                         }
4012                 }
4013
4014                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4015                         break;
4016
4017                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4018
4019                 if (conn->sess->sess_ops->SessionType &&
4020                    ((!(opcode & ISCSI_OP_TEXT)) ||
4021                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4022                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4023                         " while in Discovery Session, rejecting.\n", opcode);
4024                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4025                                           buffer);
4026                         break;
4027                 }
4028
4029                 ret = iscsi_target_rx_opcode(conn, buffer);
4030                 if (ret < 0)
4031                         break;
4032         }
4033
4034         kfree(buffer);
4035 }
4036
4037 int iscsi_target_rx_thread(void *arg)
4038 {
4039         int rc;
4040         struct iscsi_conn *conn = arg;
4041         bool conn_freed = false;
4042
4043         /*
4044          * Allow ourselves to be interrupted by SIGINT so that a
4045          * connection recovery / failure event can be triggered externally.
4046          */
4047         allow_signal(SIGINT);
4048         /*
4049          * Wait for iscsi_post_login_handler() to complete before allowing
4050          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4051          */
4052         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4053         if (rc < 0 || iscsi_target_check_conn_state(conn))
4054                 goto out;
4055
4056         if (!conn->conn_transport->iscsit_get_rx_pdu)
4057                 return 0;
4058
4059         conn->conn_transport->iscsit_get_rx_pdu(conn);
4060
4061         if (!signal_pending(current))
4062                 atomic_set(&conn->transport_failed, 1);
4063         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4064
4065 out:
4066         if (!conn_freed) {
4067                 while (!kthread_should_stop()) {
4068                         msleep(100);
4069                 }
4070         }
4071
4072         return 0;
4073 }
4074
4075 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4076 {
4077         LIST_HEAD(tmp_list);
4078         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4079         struct iscsi_session *sess = conn->sess;
4080         /*
4081          * We expect this function to only ever be called from either RX or TX
4082          * thread context via iscsit_close_connection() once the other context
4083          * has been reset -> returned sleeping pre-handler state.
4084          */
4085         spin_lock_bh(&conn->cmd_lock);
4086         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4087
4088         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4089                 struct se_cmd *se_cmd = &cmd->se_cmd;
4090
4091                 if (se_cmd->se_tfo != NULL) {
4092                         spin_lock_irq(&se_cmd->t_state_lock);
4093                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4094                                 /*
4095                                  * LIO's abort path owns the cleanup for this,
4096                                  * so put it back on the list and let
4097                                  * aborted_task handle it.
4098                                  */
4099                                 list_move_tail(&cmd->i_conn_node,
4100                                                &conn->conn_cmd_list);
4101                         } else {
4102                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4103                         }
4104                         spin_unlock_irq(&se_cmd->t_state_lock);
4105                 }
4106         }
4107         spin_unlock_bh(&conn->cmd_lock);
4108
4109         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4110                 list_del_init(&cmd->i_conn_node);
4111
4112                 iscsit_increment_maxcmdsn(cmd, sess);
4113                 iscsit_free_cmd(cmd, true);
4114
4115         }
4116 }
4117
4118 static void iscsit_stop_timers_for_cmds(
4119         struct iscsi_conn *conn)
4120 {
4121         struct iscsi_cmd *cmd;
4122
4123         spin_lock_bh(&conn->cmd_lock);
4124         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4125                 if (cmd->data_direction == DMA_TO_DEVICE)
4126                         iscsit_stop_dataout_timer(cmd);
4127         }
4128         spin_unlock_bh(&conn->cmd_lock);
4129 }
4130
4131 int iscsit_close_connection(
4132         struct iscsi_conn *conn)
4133 {
4134         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4135         struct iscsi_session    *sess = conn->sess;
4136
4137         pr_debug("Closing iSCSI connection CID %hu on SID:"
4138                 " %u\n", conn->cid, sess->sid);
4139         /*
4140          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4141          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4142          * sleeping and the logout response never got sent because the
4143          * connection failed.
4144          *
4145          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4146          * to signal logout response TX interrupt completion.  Go ahead and skip
4147          * this for iser since isert_rx_opcode() does not wait on logout failure,
4148          * and to avoid iscsi_conn pointer dereference in iser-target code.
4149          */
4150         if (!conn->conn_transport->rdma_shutdown)
4151                 complete(&conn->conn_logout_comp);
4152
4153         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4154                 if (conn->tx_thread &&
4155                     cmpxchg(&conn->tx_thread_active, true, false)) {
4156                         send_sig(SIGINT, conn->tx_thread, 1);
4157                         kthread_stop(conn->tx_thread);
4158                 }
4159         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4160                 if (conn->rx_thread &&
4161                     cmpxchg(&conn->rx_thread_active, true, false)) {
4162                         send_sig(SIGINT, conn->rx_thread, 1);
4163                         kthread_stop(conn->rx_thread);
4164                 }
4165         }
4166
4167         spin_lock(&iscsit_global->ts_bitmap_lock);
4168         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4169                               get_order(1));
4170         spin_unlock(&iscsit_global->ts_bitmap_lock);
4171
4172         iscsit_stop_timers_for_cmds(conn);
4173         iscsit_stop_nopin_response_timer(conn);
4174         iscsit_stop_nopin_timer(conn);
4175
4176         if (conn->conn_transport->iscsit_wait_conn)
4177                 conn->conn_transport->iscsit_wait_conn(conn);
4178
4179         /*
4180          * During Connection recovery drop unacknowledged out of order
4181          * commands for this connection, and prepare the other commands
4182          * for reallegiance.
4183          *
4184          * During normal operation clear the out of order commands (but
4185          * do not free the struct iscsi_ooo_cmdsn's) and release all
4186          * struct iscsi_cmds.
4187          */
4188         if (atomic_read(&conn->connection_recovery)) {
4189                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4190                 iscsit_prepare_cmds_for_reallegiance(conn);
4191         } else {
4192                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4193                 iscsit_release_commands_from_conn(conn);
4194         }
4195         iscsit_free_queue_reqs_for_conn(conn);
4196
4197         /*
4198          * Handle decrementing session or connection usage count if
4199          * a logout response was not able to be sent because the
4200          * connection failed.  Fall back to Session Recovery here.
4201          */
4202         if (atomic_read(&conn->conn_logout_remove)) {
4203                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4204                         iscsit_dec_conn_usage_count(conn);
4205                         iscsit_dec_session_usage_count(sess);
4206                 }
4207                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4208                         iscsit_dec_conn_usage_count(conn);
4209
4210                 atomic_set(&conn->conn_logout_remove, 0);
4211                 atomic_set(&sess->session_reinstatement, 0);
4212                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4213         }
4214
4215         spin_lock_bh(&sess->conn_lock);
4216         list_del(&conn->conn_list);
4217
4218         /*
4219          * Attempt to let the Initiator know this connection failed by
4220          * sending an Connection Dropped Async Message on another
4221          * active connection.
4222          */
4223         if (atomic_read(&conn->connection_recovery))
4224                 iscsit_build_conn_drop_async_message(conn);
4225
4226         spin_unlock_bh(&sess->conn_lock);
4227
4228         /*
4229          * If connection reinstatement is being performed on this connection,
4230          * up the connection reinstatement semaphore that is being blocked on
4231          * in iscsit_cause_connection_reinstatement().
4232          */
4233         spin_lock_bh(&conn->state_lock);
4234         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4235                 spin_unlock_bh(&conn->state_lock);
4236                 complete(&conn->conn_wait_comp);
4237                 wait_for_completion(&conn->conn_post_wait_comp);
4238                 spin_lock_bh(&conn->state_lock);
4239         }
4240
4241         /*
4242          * If connection reinstatement is being performed on this connection
4243          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4244          * connection wait rcfr semaphore that is being blocked on
4245          * an iscsit_connection_reinstatement_rcfr().
4246          */
4247         if (atomic_read(&conn->connection_wait_rcfr)) {
4248                 spin_unlock_bh(&conn->state_lock);
4249                 complete(&conn->conn_wait_rcfr_comp);
4250                 wait_for_completion(&conn->conn_post_wait_comp);
4251                 spin_lock_bh(&conn->state_lock);
4252         }
4253         atomic_set(&conn->connection_reinstatement, 1);
4254         spin_unlock_bh(&conn->state_lock);
4255
4256         /*
4257          * If any other processes are accessing this connection pointer we
4258          * must wait until they have completed.
4259          */
4260         iscsit_check_conn_usage_count(conn);
4261
4262         ahash_request_free(conn->conn_tx_hash);
4263         if (conn->conn_rx_hash) {
4264                 struct crypto_ahash *tfm;
4265
4266                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4267                 ahash_request_free(conn->conn_rx_hash);
4268                 crypto_free_ahash(tfm);
4269         }
4270
4271         free_cpumask_var(conn->conn_cpumask);
4272
4273         kfree(conn->conn_ops);
4274         conn->conn_ops = NULL;
4275
4276         if (conn->sock)
4277                 sock_release(conn->sock);
4278
4279         if (conn->conn_transport->iscsit_free_conn)
4280                 conn->conn_transport->iscsit_free_conn(conn);
4281
4282         iscsit_put_transport(conn->conn_transport);
4283
4284         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4285         conn->conn_state = TARG_CONN_STATE_FREE;
4286         kfree(conn);
4287
4288         spin_lock_bh(&sess->conn_lock);
4289         atomic_dec(&sess->nconn);
4290         pr_debug("Decremented iSCSI connection count to %hu from node:"
4291                 " %s\n", atomic_read(&sess->nconn),
4292                 sess->sess_ops->InitiatorName);
4293         /*
4294          * Make sure that if one connection fails in an non ERL=2 iSCSI
4295          * Session that they all fail.
4296          */
4297         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4298              !atomic_read(&sess->session_logout))
4299                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4300
4301         /*
4302          * If this was not the last connection in the session, and we are
4303          * performing session reinstatement or falling back to ERL=0, call
4304          * iscsit_stop_session() without sleeping to shutdown the other
4305          * active connections.
4306          */
4307         if (atomic_read(&sess->nconn)) {
4308                 if (!atomic_read(&sess->session_reinstatement) &&
4309                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4310                         spin_unlock_bh(&sess->conn_lock);
4311                         return 0;
4312                 }
4313                 if (!atomic_read(&sess->session_stop_active)) {
4314                         atomic_set(&sess->session_stop_active, 1);
4315                         spin_unlock_bh(&sess->conn_lock);
4316                         iscsit_stop_session(sess, 0, 0);
4317                         return 0;
4318                 }
4319                 spin_unlock_bh(&sess->conn_lock);
4320                 return 0;
4321         }
4322
4323         /*
4324          * If this was the last connection in the session and one of the
4325          * following is occurring:
4326          *
4327          * Session Reinstatement is not being performed, and are falling back
4328          * to ERL=0 call iscsit_close_session().
4329          *
4330          * Session Logout was requested.  iscsit_close_session() will be called
4331          * elsewhere.
4332          *
4333          * Session Continuation is not being performed, start the Time2Retain
4334          * handler and check if sleep_on_sess_wait_sem is active.
4335          */
4336         if (!atomic_read(&sess->session_reinstatement) &&
4337              atomic_read(&sess->session_fall_back_to_erl0)) {
4338                 spin_unlock_bh(&sess->conn_lock);
4339                 complete_all(&sess->session_wait_comp);
4340                 iscsit_close_session(sess);
4341
4342                 return 0;
4343         } else if (atomic_read(&sess->session_logout)) {
4344                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4345                 sess->session_state = TARG_SESS_STATE_FREE;
4346
4347                 if (atomic_read(&sess->session_close)) {
4348                         spin_unlock_bh(&sess->conn_lock);
4349                         complete_all(&sess->session_wait_comp);
4350                         iscsit_close_session(sess);
4351                 } else {
4352                         spin_unlock_bh(&sess->conn_lock);
4353                 }
4354
4355                 return 0;
4356         } else {
4357                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4358                 sess->session_state = TARG_SESS_STATE_FAILED;
4359
4360                 if (!atomic_read(&sess->session_continuation))
4361                         iscsit_start_time2retain_handler(sess);
4362
4363                 if (atomic_read(&sess->session_close)) {
4364                         spin_unlock_bh(&sess->conn_lock);
4365                         complete_all(&sess->session_wait_comp);
4366                         iscsit_close_session(sess);
4367                 } else {
4368                         spin_unlock_bh(&sess->conn_lock);
4369                 }
4370
4371                 return 0;
4372         }
4373 }
4374
4375 /*
4376  * If the iSCSI Session for the iSCSI Initiator Node exists,
4377  * forcefully shutdown the iSCSI NEXUS.
4378  */
4379 int iscsit_close_session(struct iscsi_session *sess)
4380 {
4381         struct iscsi_portal_group *tpg = sess->tpg;
4382         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4383
4384         if (atomic_read(&sess->nconn)) {
4385                 pr_err("%d connection(s) still exist for iSCSI session"
4386                         " to %s\n", atomic_read(&sess->nconn),
4387                         sess->sess_ops->InitiatorName);
4388                 BUG();
4389         }
4390
4391         spin_lock_bh(&se_tpg->session_lock);
4392         atomic_set(&sess->session_logout, 1);
4393         atomic_set(&sess->session_reinstatement, 1);
4394         iscsit_stop_time2retain_timer(sess);
4395         spin_unlock_bh(&se_tpg->session_lock);
4396
4397         /*
4398          * transport_deregister_session_configfs() will clear the
4399          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4400          * can be setting it again with __transport_register_session() in
4401          * iscsi_post_login_handler() again after the iscsit_stop_session()
4402          * completes in iscsi_np context.
4403          */
4404         transport_deregister_session_configfs(sess->se_sess);
4405
4406         /*
4407          * If any other processes are accessing this session pointer we must
4408          * wait until they have completed.  If we are in an interrupt (the
4409          * time2retain handler) and contain and active session usage count we
4410          * restart the timer and exit.
4411          */
4412         if (!in_interrupt()) {
4413                 if (iscsit_check_session_usage_count(sess) == 1)
4414                         iscsit_stop_session(sess, 1, 1);
4415         } else {
4416                 if (iscsit_check_session_usage_count(sess) == 2) {
4417                         atomic_set(&sess->session_logout, 0);
4418                         iscsit_start_time2retain_handler(sess);
4419                         return 0;
4420                 }
4421         }
4422
4423         transport_deregister_session(sess->se_sess);
4424
4425         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4426                 iscsit_free_connection_recovery_entires(sess);
4427
4428         iscsit_free_all_ooo_cmdsns(sess);
4429
4430         spin_lock_bh(&se_tpg->session_lock);
4431         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4432         sess->session_state = TARG_SESS_STATE_FREE;
4433         pr_debug("Released iSCSI session from node: %s\n",
4434                         sess->sess_ops->InitiatorName);
4435         tpg->nsessions--;
4436         if (tpg->tpg_tiqn)
4437                 tpg->tpg_tiqn->tiqn_nsessions--;
4438
4439         pr_debug("Decremented number of active iSCSI Sessions on"
4440                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4441
4442         spin_lock(&sess_idr_lock);
4443         idr_remove(&sess_idr, sess->session_index);
4444         spin_unlock(&sess_idr_lock);
4445
4446         kfree(sess->sess_ops);
4447         sess->sess_ops = NULL;
4448         spin_unlock_bh(&se_tpg->session_lock);
4449
4450         kfree(sess);
4451         return 0;
4452 }
4453
4454 static void iscsit_logout_post_handler_closesession(
4455         struct iscsi_conn *conn)
4456 {
4457         struct iscsi_session *sess = conn->sess;
4458         int sleep = 1;
4459         /*
4460          * Traditional iscsi/tcp will invoke this logic from TX thread
4461          * context during session logout, so clear tx_thread_active and
4462          * sleep if iscsit_close_connection() has not already occured.
4463          *
4464          * Since iser-target invokes this logic from it's own workqueue,
4465          * always sleep waiting for RX/TX thread shutdown to complete
4466          * within iscsit_close_connection().
4467          */
4468         if (!conn->conn_transport->rdma_shutdown) {
4469                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4470                 if (!sleep)
4471                         return;
4472         }
4473
4474         atomic_set(&conn->conn_logout_remove, 0);
4475         complete(&conn->conn_logout_comp);
4476
4477         iscsit_dec_conn_usage_count(conn);
4478         atomic_set(&sess->session_close, 1);
4479         iscsit_stop_session(sess, sleep, sleep);
4480         iscsit_dec_session_usage_count(sess);
4481 }
4482
4483 static void iscsit_logout_post_handler_samecid(
4484         struct iscsi_conn *conn)
4485 {
4486         int sleep = 1;
4487
4488         if (!conn->conn_transport->rdma_shutdown) {
4489                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4490                 if (!sleep)
4491                         return;
4492         }
4493
4494         atomic_set(&conn->conn_logout_remove, 0);
4495         complete(&conn->conn_logout_comp);
4496
4497         iscsit_cause_connection_reinstatement(conn, sleep);
4498         iscsit_dec_conn_usage_count(conn);
4499 }
4500
4501 static void iscsit_logout_post_handler_diffcid(
4502         struct iscsi_conn *conn,
4503         u16 cid)
4504 {
4505         struct iscsi_conn *l_conn;
4506         struct iscsi_session *sess = conn->sess;
4507         bool conn_found = false;
4508
4509         if (!sess)
4510                 return;
4511
4512         spin_lock_bh(&sess->conn_lock);
4513         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4514                 if (l_conn->cid == cid) {
4515                         iscsit_inc_conn_usage_count(l_conn);
4516                         conn_found = true;
4517                         break;
4518                 }
4519         }
4520         spin_unlock_bh(&sess->conn_lock);
4521
4522         if (!conn_found)
4523                 return;
4524
4525         if (l_conn->sock)
4526                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4527
4528         spin_lock_bh(&l_conn->state_lock);
4529         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4530         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4531         spin_unlock_bh(&l_conn->state_lock);
4532
4533         iscsit_cause_connection_reinstatement(l_conn, 1);
4534         iscsit_dec_conn_usage_count(l_conn);
4535 }
4536
4537 /*
4538  *      Return of 0 causes the TX thread to restart.
4539  */
4540 int iscsit_logout_post_handler(
4541         struct iscsi_cmd *cmd,
4542         struct iscsi_conn *conn)
4543 {
4544         int ret = 0;
4545
4546         switch (cmd->logout_reason) {
4547         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4548                 switch (cmd->logout_response) {
4549                 case ISCSI_LOGOUT_SUCCESS:
4550                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4551                 default:
4552                         iscsit_logout_post_handler_closesession(conn);
4553                         break;
4554                 }
4555                 ret = 0;
4556                 break;
4557         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4558                 if (conn->cid == cmd->logout_cid) {
4559                         switch (cmd->logout_response) {
4560                         case ISCSI_LOGOUT_SUCCESS:
4561                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4562                         default:
4563                                 iscsit_logout_post_handler_samecid(conn);
4564                                 break;
4565                         }
4566                         ret = 0;
4567                 } else {
4568                         switch (cmd->logout_response) {
4569                         case ISCSI_LOGOUT_SUCCESS:
4570                                 iscsit_logout_post_handler_diffcid(conn,
4571                                         cmd->logout_cid);
4572                                 break;
4573                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4574                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4575                         default:
4576                                 break;
4577                         }
4578                         ret = 1;
4579                 }
4580                 break;
4581         case ISCSI_LOGOUT_REASON_RECOVERY:
4582                 switch (cmd->logout_response) {
4583                 case ISCSI_LOGOUT_SUCCESS:
4584                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4585                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4586                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4587                 default:
4588                         break;
4589                 }
4590                 ret = 1;
4591                 break;
4592         default:
4593                 break;
4594
4595         }
4596         return ret;
4597 }
4598 EXPORT_SYMBOL(iscsit_logout_post_handler);
4599
4600 void iscsit_fail_session(struct iscsi_session *sess)
4601 {
4602         struct iscsi_conn *conn;
4603
4604         spin_lock_bh(&sess->conn_lock);
4605         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4606                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4607                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4608         }
4609         spin_unlock_bh(&sess->conn_lock);
4610
4611         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4612         sess->session_state = TARG_SESS_STATE_FAILED;
4613 }
4614
4615 void iscsit_stop_session(
4616         struct iscsi_session *sess,
4617         int session_sleep,
4618         int connection_sleep)
4619 {
4620         u16 conn_count = atomic_read(&sess->nconn);
4621         struct iscsi_conn *conn, *conn_tmp = NULL;
4622         int is_last;
4623
4624         spin_lock_bh(&sess->conn_lock);
4625
4626         if (connection_sleep) {
4627                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4628                                 conn_list) {
4629                         if (conn_count == 0)
4630                                 break;
4631
4632                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4633                                 is_last = 1;
4634                         } else {
4635                                 iscsit_inc_conn_usage_count(conn_tmp);
4636                                 is_last = 0;
4637                         }
4638                         iscsit_inc_conn_usage_count(conn);
4639
4640                         spin_unlock_bh(&sess->conn_lock);
4641                         iscsit_cause_connection_reinstatement(conn, 1);
4642                         spin_lock_bh(&sess->conn_lock);
4643
4644                         iscsit_dec_conn_usage_count(conn);
4645                         if (is_last == 0)
4646                                 iscsit_dec_conn_usage_count(conn_tmp);
4647                         conn_count--;
4648                 }
4649         } else {
4650                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4651                         iscsit_cause_connection_reinstatement(conn, 0);
4652         }
4653
4654         if (session_sleep && atomic_read(&sess->nconn)) {
4655                 spin_unlock_bh(&sess->conn_lock);
4656                 wait_for_completion(&sess->session_wait_comp);
4657         } else
4658                 spin_unlock_bh(&sess->conn_lock);
4659 }
4660
4661 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4662 {
4663         struct iscsi_session *sess;
4664         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4665         struct se_session *se_sess, *se_sess_tmp;
4666         LIST_HEAD(free_list);
4667         int session_count = 0;
4668
4669         spin_lock_bh(&se_tpg->session_lock);
4670         if (tpg->nsessions && !force) {
4671                 spin_unlock_bh(&se_tpg->session_lock);
4672                 return -1;
4673         }
4674
4675         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4676                         sess_list) {
4677                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4678
4679                 spin_lock(&sess->conn_lock);
4680                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4681                     atomic_read(&sess->session_logout) ||
4682                     atomic_read(&sess->session_close) ||
4683                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4684                         spin_unlock(&sess->conn_lock);
4685                         continue;
4686                 }
4687                 iscsit_inc_session_usage_count(sess);
4688                 atomic_set(&sess->session_reinstatement, 1);
4689                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4690                 atomic_set(&sess->session_close, 1);
4691                 spin_unlock(&sess->conn_lock);
4692
4693                 list_move_tail(&se_sess->sess_list, &free_list);
4694         }
4695         spin_unlock_bh(&se_tpg->session_lock);
4696
4697         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4698                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4699
4700                 list_del_init(&se_sess->sess_list);
4701                 iscsit_stop_session(sess, 1, 1);
4702                 iscsit_dec_session_usage_count(sess);
4703                 session_count++;
4704         }
4705
4706         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4707                         " Group: %hu\n", session_count, tpg->tpgt);
4708         return 0;
4709 }
4710
4711 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4712 MODULE_VERSION("4.1.x");
4713 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4714 MODULE_LICENSE("GPL");
4715
4716 module_init(iscsi_target_init_module);
4717 module_exit(iscsi_target_cleanup_module);