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 <asm/unaligned.h>
  27 #include <scsi/scsi_proto.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_fabric.h>
  32
  33 #include <target/iscsi/iscsi_target_core.h>
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_datain_values.h"
  37 #include "iscsi_target_erl0.h"
  38 #include "iscsi_target_erl1.h"
  39 #include "iscsi_target_erl2.h"
  40 #include "iscsi_target_login.h"
  41 #include "iscsi_target_tmr.h"
  42 #include "iscsi_target_tpg.h"
  43 #include "iscsi_target_util.h"
  44 #include "iscsi_target.h"
  45 #include "iscsi_target_device.h"
  46 #include <target/iscsi/iscsi_target_stat.h>
  47
  48 #include <target/iscsi/iscsi_transport.h>
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_MUTEX(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         struct iscsi_scsi_req *, u32);
  69
  70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  71 {
  72         struct iscsi_tiqn *tiqn = NULL;
  73
  74         spin_lock(&tiqn_lock);
  75         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  76                 if (!strcmp(tiqn->tiqn, buf)) {
  77
  78                         spin_lock(&tiqn->tiqn_state_lock);
  79                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  80                                 tiqn->tiqn_access_count++;
  81                                 spin_unlock(&tiqn->tiqn_state_lock);
  82                                 spin_unlock(&tiqn_lock);
  83                                 return tiqn;
  84                         }
  85                         spin_unlock(&tiqn->tiqn_state_lock);
  86                 }
  87         }
  88         spin_unlock(&tiqn_lock);
  89
  90         return NULL;
  91 }
  92
  93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  94 {
  95         spin_lock(&tiqn->tiqn_state_lock);
  96         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  97                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  98                 spin_unlock(&tiqn->tiqn_state_lock);
  99                 return 0;
 100         }
 101         spin_unlock(&tiqn->tiqn_state_lock);
 102
 103         return -1;
 104 }
 105
 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 107 {
 108         spin_lock(&tiqn->tiqn_state_lock);
 109         tiqn->tiqn_access_count--;
 110         spin_unlock(&tiqn->tiqn_state_lock);
 111 }
 112
 113 /*
 114  * Note that IQN formatting is expected to be done in userspace, and
 115  * no explict IQN format checks are done here.
 116  */
 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 118 {
 119         struct iscsi_tiqn *tiqn = NULL;
 120         int ret;
 121
 122         if (strlen(buf) >= ISCSI_IQN_LEN) {
 123                 pr_err("Target IQN exceeds %d bytes\n",
 124                                 ISCSI_IQN_LEN);
 125                 return ERR_PTR(-EINVAL);
 126         }
 127
 128         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 129         if (!tiqn) {
 130                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133
 134         sprintf(tiqn->tiqn, "%s", buf);
 135         INIT_LIST_HEAD(&tiqn->tiqn_list);
 136         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 137         spin_lock_init(&tiqn->tiqn_state_lock);
 138         spin_lock_init(&tiqn->tiqn_tpg_lock);
 139         spin_lock_init(&tiqn->sess_err_stats.lock);
 140         spin_lock_init(&tiqn->login_stats.lock);
 141         spin_lock_init(&tiqn->logout_stats.lock);
 142
 143         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 144
 145         idr_preload(GFP_KERNEL);
 146         spin_lock(&tiqn_lock);
 147
 148         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 149         if (ret < 0) {
 150                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 151                 spin_unlock(&tiqn_lock);
 152                 idr_preload_end();
 153                 kfree(tiqn);
 154                 return ERR_PTR(ret);
 155         }
 156         tiqn->tiqn_index = ret;
 157         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 158
 159         spin_unlock(&tiqn_lock);
 160         idr_preload_end();
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         spin_unlock_bh(&np->np_thread_lock);
 219         /*
 220          * Determine if the portal group is accepting storage traffic.
 221          */
 222         spin_lock_bh(&tpg->tpg_state_lock);
 223         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 224                 spin_unlock_bh(&tpg->tpg_state_lock);
 225                 return -1;
 226         }
 227         spin_unlock_bh(&tpg->tpg_state_lock);
 228
 229         /*
 230          * Here we serialize access across the TIQN+TPG Tuple.
 231          */
 232         ret = down_interruptible(&tpg->np_login_sem);
 233         if (ret != 0)
 234                 return -1;
 235
 236         spin_lock_bh(&tpg->tpg_state_lock);
 237         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 238                 spin_unlock_bh(&tpg->tpg_state_lock);
 239                 up(&tpg->np_login_sem);
 240                 return -1;
 241         }
 242         spin_unlock_bh(&tpg->tpg_state_lock);
 243
 244         return 0;
 245 }
 246
 247 void iscsit_login_kref_put(struct kref *kref)
 248 {
 249         struct iscsi_tpg_np *tpg_np = container_of(kref,
 250                                 struct iscsi_tpg_np, tpg_np_kref);
 251
 252         complete(&tpg_np->tpg_np_comp);
 253 }
 254
 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 256                        struct iscsi_tpg_np *tpg_np)
 257 {
 258         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 259
 260         up(&tpg->np_login_sem);
 261
 262         if (tpg_np)
 263                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 264
 265         if (tiqn)
 266                 iscsit_put_tiqn_for_login(tiqn);
 267
 268         return 0;
 269 }
 270
 271 bool iscsit_check_np_match(
 272         struct sockaddr_storage *sockaddr,
 273         struct iscsi_np *np,
 274         int network_transport)
 275 {
 276         struct sockaddr_in *sock_in, *sock_in_e;
 277         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 278         bool ip_match = false;
 279         u16 port, port_e;
 280
 281         if (sockaddr->ss_family == AF_INET6) {
 282                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 283                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 284
 285                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 286                             &sock_in6_e->sin6_addr.in6_u,
 287                             sizeof(struct in6_addr)))
 288                         ip_match = true;
 289
 290                 port = ntohs(sock_in6->sin6_port);
 291                 port_e = ntohs(sock_in6_e->sin6_port);
 292         } else {
 293                 sock_in = (struct sockaddr_in *)sockaddr;
 294                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 297                         ip_match = true;
 298
 299                 port = ntohs(sock_in->sin_port);
 300                 port_e = ntohs(sock_in_e->sin_port);
 301         }
 302
 303         if (ip_match && (port_e == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct sockaddr_storage *sockaddr,
 346         int network_transport)
 347 {
 348         struct iscsi_np *np;
 349         int ret;
 350
 351         mutex_lock(&np_lock);
 352
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np) {
 358                 mutex_unlock(&np_lock);
 359                 return np;
 360         }
 361
 362         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 363         if (!np) {
 364                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 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
 422         if (np->np_thread) {
 423                 spin_unlock_bh(&np->np_thread_lock);
 424                 send_sig(SIGINT, np->np_thread, 1);
 425                 wait_for_completion(&np->np_restart_comp);
 426                 spin_lock_bh(&np->np_thread_lock);
 427         }
 428         spin_unlock_bh(&np->np_thread_lock);
 429
 430         if (tpg_np && shutdown) {
 431                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 432
 433                 wait_for_completion(&tpg_np->tpg_np_comp);
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void iscsit_free_np(struct iscsi_np *np)
 440 {
 441         if (np->np_socket)
 442                 sock_release(np->np_socket);
 443 }
 444
 445 int iscsit_del_np(struct iscsi_np *np)
 446 {
 447         spin_lock_bh(&np->np_thread_lock);
 448         np->np_exports--;
 449         if (np->np_exports) {
 450                 np->enabled = true;
 451                 spin_unlock_bh(&np->np_thread_lock);
 452                 return 0;
 453         }
 454         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 455         spin_unlock_bh(&np->np_thread_lock);
 456
 457         if (np->np_thread) {
 458                 /*
 459                  * We need to send the signal to wakeup Linux/Net
 460                  * which may be sleeping in sock_accept()..
 461                  */
 462                 send_sig(SIGINT, np->np_thread, 1);
 463                 kthread_stop(np->np_thread);
 464                 np->np_thread = NULL;
 465         }
 466
 467         np->np_transport->iscsit_free_np(np);
 468
 469         mutex_lock(&np_lock);
 470         list_del(&np->np_list);
 471         mutex_unlock(&np_lock);
 472
 473         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 474                 &np->np_sockaddr, np->np_transport->name);
 475
 476         iscsit_put_transport(np->np_transport);
 477         kfree(np);
 478         return 0;
 479 }
 480
 481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 482
 483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 484 {
 485         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 486         return 0;
 487 }
 488 EXPORT_SYMBOL(iscsit_queue_rsp);
 489
 490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 491 {
 492         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 493
 494         spin_lock_bh(&conn->cmd_lock);
 495         if (!list_empty(&cmd->i_conn_node))
 496                 list_del_init(&cmd->i_conn_node);
 497         spin_unlock_bh(&conn->cmd_lock);
 498
 499         __iscsit_free_cmd(cmd, scsi_cmd, true);
 500 }
 501 EXPORT_SYMBOL(iscsit_aborted_task);
 502
 503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 504                                       u32, u32, u8 *, u8 *);
 505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 506
 507 static int
 508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 509                           const void *data_buf, u32 data_buf_len)
 510 {
 511         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 512         struct kvec *iov;
 513         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 514         int ret;
 515
 516         iov = &cmd->iov_misc[0];
 517         iov[niov].iov_base      = cmd->pdu;
 518         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 519
 520         if (conn->conn_ops->HeaderDigest) {
 521                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 522
 523                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 524                                           ISCSI_HDR_LEN, 0, NULL,
 525                                           (u8 *)header_digest);
 526
 527                 iov[0].iov_len += ISCSI_CRC_LEN;
 528                 tx_size += ISCSI_CRC_LEN;
 529                 pr_debug("Attaching CRC32C HeaderDigest"
 530                          " to opcode 0x%x 0x%08x\n",
 531                          hdr->opcode, *header_digest);
 532         }
 533
 534         if (data_buf_len) {
 535                 u32 padding = ((-data_buf_len) & 3);
 536
 537                 iov[niov].iov_base      = (void *)data_buf;
 538                 iov[niov++].iov_len     = data_buf_len;
 539                 tx_size += data_buf_len;
 540
 541                 if (padding != 0) {
 542                         iov[niov].iov_base = &cmd->pad_bytes;
 543                         iov[niov++].iov_len = padding;
 544                         tx_size += padding;
 545                         pr_debug("Attaching %u additional"
 546                                  " padding bytes.\n", padding);
 547                 }
 548
 549                 if (conn->conn_ops->DataDigest) {
 550                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 551                                                   data_buf, data_buf_len,
 552                                                   padding,
 553                                                   (u8 *)&cmd->pad_bytes,
 554                                                   (u8 *)&cmd->data_crc);
 555
 556                         iov[niov].iov_base = &cmd->data_crc;
 557                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 558                         tx_size += ISCSI_CRC_LEN;
 559                         pr_debug("Attached DataDigest for %u"
 560                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 561                                  data_buf_len, hdr->opcode, cmd->data_crc);
 562                 }
 563         }
 564
 565         cmd->iov_misc_count = niov;
 566         cmd->tx_size = tx_size;
 567
 568         ret = iscsit_send_tx_data(cmd, conn, 1);
 569         if (ret < 0) {
 570                 iscsit_tx_thread_wait_for_tcp(conn);
 571                 return ret;
 572         }
 573
 574         return 0;
 575 }
 576
 577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 580                                     u32, u32, u32, u8 *);
 581 static int
 582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 583                        const struct iscsi_datain *datain)
 584 {
 585         struct kvec *iov;
 586         u32 iov_count = 0, tx_size = 0;
 587         int ret, iov_ret;
 588
 589         iov = &cmd->iov_data[0];
 590         iov[iov_count].iov_base = cmd->pdu;
 591         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 592         tx_size += ISCSI_HDR_LEN;
 593
 594         if (conn->conn_ops->HeaderDigest) {
 595                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 596
 597                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 598                                           ISCSI_HDR_LEN, 0, NULL,
 599                                           (u8 *)header_digest);
 600
 601                 iov[0].iov_len += ISCSI_CRC_LEN;
 602                 tx_size += ISCSI_CRC_LEN;
 603
 604                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 605                          *header_digest);
 606         }
 607
 608         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 609                                    datain->offset, datain->length);
 610         if (iov_ret < 0)
 611                 return -1;
 612
 613         iov_count += iov_ret;
 614         tx_size += datain->length;
 615
 616         cmd->padding = ((-datain->length) & 3);
 617         if (cmd->padding) {
 618                 iov[iov_count].iov_base         = cmd->pad_bytes;
 619                 iov[iov_count++].iov_len        = cmd->padding;
 620                 tx_size += cmd->padding;
 621
 622                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 623         }
 624
 625         if (conn->conn_ops->DataDigest) {
 626                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 627                                                          cmd, datain->offset,
 628                                                          datain->length,
 629                                                          cmd->padding,
 630                                                          cmd->pad_bytes);
 631
 632                 iov[iov_count].iov_base = &cmd->data_crc;
 633                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 634                 tx_size += ISCSI_CRC_LEN;
 635
 636                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 637                          datain->length + cmd->padding, cmd->data_crc);
 638         }
 639
 640         cmd->iov_data_count = iov_count;
 641         cmd->tx_size = tx_size;
 642
 643         ret = iscsit_fe_sendpage_sg(cmd, conn);
 644
 645         iscsit_unmap_iovec(cmd);
 646
 647         if (ret < 0) {
 648                 iscsit_tx_thread_wait_for_tcp(conn);
 649                 return ret;
 650         }
 651
 652         return 0;
 653 }
 654
 655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 656                            struct iscsi_datain_req *dr, const void *buf,
 657                            u32 buf_len)
 658 {
 659         if (dr)
 660                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 661         else
 662                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 663 }
 664
 665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 666 {
 667         return TARGET_PROT_NORMAL;
 668 }
 669
 670 static struct iscsit_transport iscsi_target_transport = {
 671         .name                   = "iSCSI/TCP",
 672         .transport_type         = ISCSI_TCP,
 673         .owner                  = NULL,
 674         .iscsit_setup_np        = iscsit_setup_np,
 675         .iscsit_accept_np       = iscsit_accept_np,
 676         .iscsit_free_np         = iscsit_free_np,
 677         .iscsit_get_login_rx    = iscsit_get_login_rx,
 678         .iscsit_put_login_tx    = iscsit_put_login_tx,
 679         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 680         .iscsit_immediate_queue = iscsit_immediate_queue,
 681         .iscsit_response_queue  = iscsit_response_queue,
 682         .iscsit_queue_data_in   = iscsit_queue_rsp,
 683         .iscsit_queue_status    = iscsit_queue_rsp,
 684         .iscsit_aborted_task    = iscsit_aborted_task,
 685         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 686         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 687         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 688 };
 689
 690 static int __init iscsi_target_init_module(void)
 691 {
 692         int ret = 0, size;
 693
 694         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 695
 696         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 697         if (!iscsit_global) {
 698                 pr_err("Unable to allocate memory for iscsit_global\n");
 699                 return -1;
 700         }
 701         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 702         mutex_init(&auth_id_lock);
 703         spin_lock_init(&sess_idr_lock);
 704         idr_init(&tiqn_idr);
 705         idr_init(&sess_idr);
 706
 707         ret = target_register_template(&iscsi_ops);
 708         if (ret)
 709                 goto out;
 710
 711         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 712         iscsit_global->ts_bitmap = vzalloc(size);
 713         if (!iscsit_global->ts_bitmap) {
 714                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 715                 goto configfs_out;
 716         }
 717
 718         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 719                         sizeof(struct iscsi_queue_req),
 720                         __alignof__(struct iscsi_queue_req), 0, NULL);
 721         if (!lio_qr_cache) {
 722                 pr_err("nable to kmem_cache_create() for"
 723                                 " lio_qr_cache\n");
 724                 goto bitmap_out;
 725         }
 726
 727         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 728                         sizeof(struct iscsi_datain_req),
 729                         __alignof__(struct iscsi_datain_req), 0, NULL);
 730         if (!lio_dr_cache) {
 731                 pr_err("Unable to kmem_cache_create() for"
 732                                 " lio_dr_cache\n");
 733                 goto qr_out;
 734         }
 735
 736         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 737                         sizeof(struct iscsi_ooo_cmdsn),
 738                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 739         if (!lio_ooo_cache) {
 740                 pr_err("Unable to kmem_cache_create() for"
 741                                 " lio_ooo_cache\n");
 742                 goto dr_out;
 743         }
 744
 745         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 746                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 747                         0, NULL);
 748         if (!lio_r2t_cache) {
 749                 pr_err("Unable to kmem_cache_create() for"
 750                                 " lio_r2t_cache\n");
 751                 goto ooo_out;
 752         }
 753
 754         iscsit_register_transport(&iscsi_target_transport);
 755
 756         if (iscsit_load_discovery_tpg() < 0)
 757                 goto r2t_out;
 758
 759         return ret;
 760 r2t_out:
 761         iscsit_unregister_transport(&iscsi_target_transport);
 762         kmem_cache_destroy(lio_r2t_cache);
 763 ooo_out:
 764         kmem_cache_destroy(lio_ooo_cache);
 765 dr_out:
 766         kmem_cache_destroy(lio_dr_cache);
 767 qr_out:
 768         kmem_cache_destroy(lio_qr_cache);
 769 bitmap_out:
 770         vfree(iscsit_global->ts_bitmap);
 771 configfs_out:
 772         /* XXX: this probably wants it to be it's own unwind step.. */
 773         if (iscsit_global->discovery_tpg)
 774                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 775         target_unregister_template(&iscsi_ops);
 776 out:
 777         kfree(iscsit_global);
 778         return -ENOMEM;
 779 }
 780
 781 static void __exit iscsi_target_cleanup_module(void)
 782 {
 783         iscsit_release_discovery_tpg();
 784         iscsit_unregister_transport(&iscsi_target_transport);
 785         kmem_cache_destroy(lio_qr_cache);
 786         kmem_cache_destroy(lio_dr_cache);
 787         kmem_cache_destroy(lio_ooo_cache);
 788         kmem_cache_destroy(lio_r2t_cache);
 789
 790         /*
 791          * Shutdown discovery sessions and disable discovery TPG
 792          */
 793         if (iscsit_global->discovery_tpg)
 794                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 795
 796         target_unregister_template(&iscsi_ops);
 797
 798         vfree(iscsit_global->ts_bitmap);
 799         kfree(iscsit_global);
 800 }
 801
 802 int iscsit_add_reject(
 803         struct iscsi_conn *conn,
 804         u8 reason,
 805         unsigned char *buf)
 806 {
 807         struct iscsi_cmd *cmd;
 808
 809         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 810         if (!cmd)
 811                 return -1;
 812
 813         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 814         cmd->reject_reason = reason;
 815
 816         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 817         if (!cmd->buf_ptr) {
 818                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 819                 iscsit_free_cmd(cmd, false);
 820                 return -1;
 821         }
 822
 823         spin_lock_bh(&conn->cmd_lock);
 824         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 825         spin_unlock_bh(&conn->cmd_lock);
 826
 827         cmd->i_state = ISTATE_SEND_REJECT;
 828         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 829
 830         return -1;
 831 }
 832 EXPORT_SYMBOL(iscsit_add_reject);
 833
 834 static int iscsit_add_reject_from_cmd(
 835         struct iscsi_cmd *cmd,
 836         u8 reason,
 837         bool add_to_conn,
 838         unsigned char *buf)
 839 {
 840         struct iscsi_conn *conn;
 841
 842         if (!cmd->conn) {
 843                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 844                                 cmd->init_task_tag);
 845                 return -1;
 846         }
 847         conn = cmd->conn;
 848
 849         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 850         cmd->reject_reason = reason;
 851
 852         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 853         if (!cmd->buf_ptr) {
 854                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 855                 iscsit_free_cmd(cmd, false);
 856                 return -1;
 857         }
 858
 859         if (add_to_conn) {
 860                 spin_lock_bh(&conn->cmd_lock);
 861                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 862                 spin_unlock_bh(&conn->cmd_lock);
 863         }
 864
 865         cmd->i_state = ISTATE_SEND_REJECT;
 866         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 867         /*
 868          * Perform the kref_put now if se_cmd has already been setup by
 869          * scsit_setup_scsi_cmd()
 870          */
 871         if (cmd->se_cmd.se_tfo != NULL) {
 872                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 873                 target_put_sess_cmd(&cmd->se_cmd);
 874         }
 875         return -1;
 876 }
 877
 878 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 879                                  unsigned char *buf)
 880 {
 881         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 882 }
 883
 884 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 885 {
 886         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 887 }
 888 EXPORT_SYMBOL(iscsit_reject_cmd);
 889
 890 /*
 891  * Map some portion of the allocated scatterlist to an iovec, suitable for
 892  * kernel sockets to copy data in/out.
 893  */
 894 static int iscsit_map_iovec(
 895         struct iscsi_cmd *cmd,
 896         struct kvec *iov,
 897         u32 data_offset,
 898         u32 data_length)
 899 {
 900         u32 i = 0;
 901         struct scatterlist *sg;
 902         unsigned int page_off;
 903
 904         /*
 905          * We know each entry in t_data_sg contains a page.
 906          */
 907         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 908         page_off = (data_offset % PAGE_SIZE);
 909
 910         cmd->first_data_sg = sg;
 911         cmd->first_data_sg_off = page_off;
 912
 913         while (data_length) {
 914                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 915
 916                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 917                 iov[i].iov_len = cur_len;
 918
 919                 data_length -= cur_len;
 920                 page_off = 0;
 921                 sg = sg_next(sg);
 922                 i++;
 923         }
 924
 925         cmd->kmapped_nents = i;
 926
 927         return i;
 928 }
 929
 930 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 931 {
 932         u32 i;
 933         struct scatterlist *sg;
 934
 935         sg = cmd->first_data_sg;
 936
 937         for (i = 0; i < cmd->kmapped_nents; i++)
 938                 kunmap(sg_page(&sg[i]));
 939 }
 940
 941 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 942 {
 943         LIST_HEAD(ack_list);
 944         struct iscsi_cmd *cmd, *cmd_p;
 945
 946         conn->exp_statsn = exp_statsn;
 947
 948         if (conn->sess->sess_ops->RDMAExtensions)
 949                 return;
 950
 951         spin_lock_bh(&conn->cmd_lock);
 952         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 953                 spin_lock(&cmd->istate_lock);
 954                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 955                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 956                         cmd->i_state = ISTATE_REMOVE;
 957                         spin_unlock(&cmd->istate_lock);
 958                         list_move_tail(&cmd->i_conn_node, &ack_list);
 959                         continue;
 960                 }
 961                 spin_unlock(&cmd->istate_lock);
 962         }
 963         spin_unlock_bh(&conn->cmd_lock);
 964
 965         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 966                 list_del_init(&cmd->i_conn_node);
 967                 iscsit_free_cmd(cmd, false);
 968         }
 969 }
 970
 971 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 972 {
 973         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 974
 975         iov_count += ISCSI_IOV_DATA_BUFFER;
 976
 977         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 978         if (!cmd->iov_data) {
 979                 pr_err("Unable to allocate cmd->iov_data\n");
 980                 return -ENOMEM;
 981         }
 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                 if (cmd->reject_reason)
1255                         return 0;
1256
1257                 return 1;
1258         }
1259         /*
1260          * Call directly into transport_generic_new_cmd() to perform
1261          * the backend memory allocation.
1262          */
1263         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1264         if (cmd->sense_reason)
1265                 return 1;
1266
1267         return 0;
1268 }
1269 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1270
1271 static int
1272 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1273                           bool dump_payload)
1274 {
1275         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1276         /*
1277          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1278          */
1279         if (dump_payload)
1280                 goto after_immediate_data;
1281
1282         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1283                                         cmd->first_burst_len);
1284 after_immediate_data:
1285         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1286                 /*
1287                  * A PDU/CmdSN carrying Immediate Data passed
1288                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1289                  * Immediate Bit is not set.
1290                  */
1291                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1292                                         (unsigned char *)hdr, hdr->cmdsn);
1293                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1294                         return -1;
1295
1296                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1297                         int rc;
1298
1299                         rc = iscsit_dump_data_payload(cmd->conn,
1300                                                       cmd->first_burst_len, 1);
1301                         target_put_sess_cmd(&cmd->se_cmd);
1302                         return rc;
1303                 } else if (cmd->unsolicited_data)
1304                         iscsit_set_unsoliticed_dataout(cmd);
1305
1306         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1307                 /*
1308                  * Immediate Data failed DataCRC and ERL>=1,
1309                  * silently drop this PDU and let the initiator
1310                  * plug the CmdSN gap.
1311                  *
1312                  * FIXME: Send Unsolicited NOPIN with reserved
1313                  * TTT here to help the initiator figure out
1314                  * the missing CmdSN, although they should be
1315                  * intelligent enough to determine the missing
1316                  * CmdSN and issue a retry to plug the sequence.
1317                  */
1318                 cmd->i_state = ISTATE_REMOVE;
1319                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1320         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1321                 return -1;
1322
1323         return 0;
1324 }
1325
1326 static int
1327 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1328                            unsigned char *buf)
1329 {
1330         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1331         int rc, immed_data;
1332         bool dump_payload = false;
1333
1334         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1335         if (rc < 0)
1336                 return 0;
1337         /*
1338          * Allocation iovecs needed for struct socket operations for
1339          * traditional iSCSI block I/O.
1340          */
1341         if (iscsit_allocate_iovecs(cmd) < 0) {
1342                 return iscsit_reject_cmd(cmd,
1343                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1344         }
1345         immed_data = cmd->immediate_data;
1346
1347         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1348         if (rc < 0)
1349                 return rc;
1350         else if (rc > 0)
1351                 dump_payload = true;
1352
1353         if (!immed_data)
1354                 return 0;
1355
1356         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1357 }
1358
1359 static u32 iscsit_do_crypto_hash_sg(
1360         struct ahash_request *hash,
1361         struct iscsi_cmd *cmd,
1362         u32 data_offset,
1363         u32 data_length,
1364         u32 padding,
1365         u8 *pad_bytes)
1366 {
1367         u32 data_crc;
1368         struct scatterlist *sg;
1369         unsigned int page_off;
1370
1371         crypto_ahash_init(hash);
1372
1373         sg = cmd->first_data_sg;
1374         page_off = cmd->first_data_sg_off;
1375
1376         while (data_length) {
1377                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1378
1379                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1380                 crypto_ahash_update(hash);
1381
1382                 data_length -= cur_len;
1383                 page_off = 0;
1384                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1385                 sg = sg_next(sg);
1386         }
1387
1388         if (padding) {
1389                 struct scatterlist pad_sg;
1390
1391                 sg_init_one(&pad_sg, pad_bytes, padding);
1392                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1393                                         padding);
1394                 crypto_ahash_finup(hash);
1395         } else {
1396                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1397                 crypto_ahash_final(hash);
1398         }
1399
1400         return data_crc;
1401 }
1402
1403 static void iscsit_do_crypto_hash_buf(
1404         struct ahash_request *hash,
1405         const void *buf,
1406         u32 payload_length,
1407         u32 padding,
1408         u8 *pad_bytes,
1409         u8 *data_crc)
1410 {
1411         struct scatterlist sg[2];
1412
1413         sg_init_table(sg, ARRAY_SIZE(sg));
1414         sg_set_buf(sg, buf, payload_length);
1415         sg_set_buf(sg + 1, pad_bytes, padding);
1416
1417         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1418
1419         crypto_ahash_digest(hash);
1420 }
1421
1422 int
1423 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1424                           struct iscsi_cmd **out_cmd)
1425 {
1426         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1427         struct iscsi_cmd *cmd = NULL;
1428         struct se_cmd *se_cmd;
1429         u32 payload_length = ntoh24(hdr->dlength);
1430         int rc;
1431
1432         if (!payload_length) {
1433                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1434                 return 0;
1435         }
1436
1437         /* iSCSI write */
1438         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1439
1440         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1441                 pr_err("DataSegmentLength: %u is greater than"
1442                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1443                         conn->conn_ops->MaxXmitDataSegmentLength);
1444                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1445                                          buf);
1446         }
1447
1448         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1449                         payload_length);
1450         if (!cmd)
1451                 return 0;
1452
1453         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1454                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1455                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1456                 payload_length, conn->cid);
1457
1458         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1459                 pr_err("Command ITT: 0x%08x received DataOUT after"
1460                         " last DataOUT received, dumping payload\n",
1461                         cmd->init_task_tag);
1462                 return iscsit_dump_data_payload(conn, payload_length, 1);
1463         }
1464
1465         if (cmd->data_direction != DMA_TO_DEVICE) {
1466                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1467                         " NON-WRITE command.\n", cmd->init_task_tag);
1468                 return iscsit_dump_data_payload(conn, payload_length, 1);
1469         }
1470         se_cmd = &cmd->se_cmd;
1471         iscsit_mod_dataout_timer(cmd);
1472
1473         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1474                 pr_err("DataOut Offset: %u, Length %u greater than"
1475                         " iSCSI Command EDTL %u, protocol error.\n",
1476                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1477                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1478         }
1479
1480         if (cmd->unsolicited_data) {
1481                 int dump_unsolicited_data = 0;
1482
1483                 if (conn->sess->sess_ops->InitialR2T) {
1484                         pr_err("Received unexpected unsolicited data"
1485                                 " while InitialR2T=Yes, protocol error.\n");
1486                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1487                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1488                         return -1;
1489                 }
1490                 /*
1491                  * Special case for dealing with Unsolicited DataOUT
1492                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1493                  * failures;
1494                  */
1495
1496                 /* Something's amiss if we're not in WRITE_PENDING state... */
1497                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1498                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1499                         dump_unsolicited_data = 1;
1500
1501                 if (dump_unsolicited_data) {
1502                         /*
1503                          * Check if a delayed TASK_ABORTED status needs to
1504                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1505                          * received with the unsolicited data out.
1506                          */
1507                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1508                                 iscsit_stop_dataout_timer(cmd);
1509
1510                         transport_check_aborted_status(se_cmd,
1511                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1512                         return iscsit_dump_data_payload(conn, payload_length, 1);
1513                 }
1514         } else {
1515                 /*
1516                  * For the normal solicited data path:
1517                  *
1518                  * Check for a delayed TASK_ABORTED status and dump any
1519                  * incoming data out payload if one exists.  Also, when the
1520                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1521                  * data out sequence, we decrement outstanding_r2ts.  Once
1522                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1523                  * TASK_ABORTED status.
1524                  */
1525                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1526                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1527                                 if (--cmd->outstanding_r2ts < 1) {
1528                                         iscsit_stop_dataout_timer(cmd);
1529                                         transport_check_aborted_status(
1530                                                         se_cmd, 1);
1531                                 }
1532
1533                         return iscsit_dump_data_payload(conn, payload_length, 1);
1534                 }
1535         }
1536         /*
1537          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1538          * within-command recovery checks before receiving the payload.
1539          */
1540         rc = iscsit_check_pre_dataout(cmd, buf);
1541         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1542                 return 0;
1543         else if (rc == DATAOUT_CANNOT_RECOVER)
1544                 return -1;
1545
1546         *out_cmd = cmd;
1547         return 0;
1548 }
1549 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1550
1551 static int
1552 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1553                    struct iscsi_data *hdr)
1554 {
1555         struct kvec *iov;
1556         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1557         u32 payload_length = ntoh24(hdr->dlength);
1558         int iov_ret, data_crc_failed = 0;
1559
1560         rx_size += payload_length;
1561         iov = &cmd->iov_data[0];
1562
1563         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1564                                    payload_length);
1565         if (iov_ret < 0)
1566                 return -1;
1567
1568         iov_count += iov_ret;
1569
1570         padding = ((-payload_length) & 3);
1571         if (padding != 0) {
1572                 iov[iov_count].iov_base = cmd->pad_bytes;
1573                 iov[iov_count++].iov_len = padding;
1574                 rx_size += padding;
1575                 pr_debug("Receiving %u padding bytes.\n", padding);
1576         }
1577
1578         if (conn->conn_ops->DataDigest) {
1579                 iov[iov_count].iov_base = &checksum;
1580                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1581                 rx_size += ISCSI_CRC_LEN;
1582         }
1583
1584         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1585
1586         iscsit_unmap_iovec(cmd);
1587
1588         if (rx_got != rx_size)
1589                 return -1;
1590
1591         if (conn->conn_ops->DataDigest) {
1592                 u32 data_crc;
1593
1594                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1595                                                     be32_to_cpu(hdr->offset),
1596                                                     payload_length, padding,
1597                                                     cmd->pad_bytes);
1598
1599                 if (checksum != data_crc) {
1600                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1601                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1602                                 " does not match computed 0x%08x\n",
1603                                 hdr->itt, hdr->offset, payload_length,
1604                                 hdr->datasn, checksum, data_crc);
1605                         data_crc_failed = 1;
1606                 } else {
1607                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1608                                 " %u bytes of Data Out\n", checksum,
1609                                 payload_length);
1610                 }
1611         }
1612
1613         return data_crc_failed;
1614 }
1615
1616 int
1617 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1618                              bool data_crc_failed)
1619 {
1620         struct iscsi_conn *conn = cmd->conn;
1621         int rc, ooo_cmdsn;
1622         /*
1623          * Increment post receive data and CRC values or perform
1624          * within-command recovery.
1625          */
1626         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1627         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1628                 return 0;
1629         else if (rc == DATAOUT_SEND_R2T) {
1630                 iscsit_set_dataout_sequence_values(cmd);
1631                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1632         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1633                 /*
1634                  * Handle extra special case for out of order
1635                  * Unsolicited Data Out.
1636                  */
1637                 spin_lock_bh(&cmd->istate_lock);
1638                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1639                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1640                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1641                 spin_unlock_bh(&cmd->istate_lock);
1642
1643                 iscsit_stop_dataout_timer(cmd);
1644                 if (ooo_cmdsn)
1645                         return 0;
1646                 target_execute_cmd(&cmd->se_cmd);
1647                 return 0;
1648         } else /* DATAOUT_CANNOT_RECOVER */
1649                 return -1;
1650
1651         return 0;
1652 }
1653 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1654
1655 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1656 {
1657         struct iscsi_cmd *cmd = NULL;
1658         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1659         int rc;
1660         bool data_crc_failed = false;
1661
1662         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1663         if (rc < 0)
1664                 return 0;
1665         else if (!cmd)
1666                 return 0;
1667
1668         rc = iscsit_get_dataout(conn, cmd, hdr);
1669         if (rc < 0)
1670                 return rc;
1671         else if (rc > 0)
1672                 data_crc_failed = true;
1673
1674         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1675 }
1676
1677 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1678                          struct iscsi_nopout *hdr)
1679 {
1680         u32 payload_length = ntoh24(hdr->dlength);
1681
1682         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1683                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1684                 if (!cmd)
1685                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1686                                                  (unsigned char *)hdr);
1687
1688                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1689                                          (unsigned char *)hdr);
1690         }
1691
1692         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1693                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1694                         " not set, protocol error.\n");
1695                 if (!cmd)
1696                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1697                                                  (unsigned char *)hdr);
1698
1699                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1700                                          (unsigned char *)hdr);
1701         }
1702
1703         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1704                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1705                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1706                         " error.\n", payload_length,
1707                         conn->conn_ops->MaxXmitDataSegmentLength);
1708                 if (!cmd)
1709                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1710                                                  (unsigned char *)hdr);
1711
1712                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1713                                          (unsigned char *)hdr);
1714         }
1715
1716         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1717                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1718                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1719                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1720                 payload_length);
1721         /*
1722          * This is not a response to a Unsolicited NopIN, which means
1723          * it can either be a NOPOUT ping request (with a valid ITT),
1724          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1725          * Either way, make sure we allocate an struct iscsi_cmd, as both
1726          * can contain ping data.
1727          */
1728         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1729                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1730                 cmd->i_state            = ISTATE_SEND_NOPIN;
1731                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1732                                                 1 : 0);
1733                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1734                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1735                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1736                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1737                 cmd->data_direction     = DMA_NONE;
1738         }
1739
1740         return 0;
1741 }
1742 EXPORT_SYMBOL(iscsit_setup_nop_out);
1743
1744 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1745                            struct iscsi_nopout *hdr)
1746 {
1747         struct iscsi_cmd *cmd_p = NULL;
1748         int cmdsn_ret = 0;
1749         /*
1750          * Initiator is expecting a NopIN ping reply..
1751          */
1752         if (hdr->itt != RESERVED_ITT) {
1753                 if (!cmd)
1754                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1755                                                 (unsigned char *)hdr);
1756
1757                 spin_lock_bh(&conn->cmd_lock);
1758                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1759                 spin_unlock_bh(&conn->cmd_lock);
1760
1761                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1762
1763                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1764                         iscsit_add_cmd_to_response_queue(cmd, conn,
1765                                                          cmd->i_state);
1766                         return 0;
1767                 }
1768
1769                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1770                                 (unsigned char *)hdr, hdr->cmdsn);
1771                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1772                         return 0;
1773                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1774                         return -1;
1775
1776                 return 0;
1777         }
1778         /*
1779          * This was a response to a unsolicited NOPIN ping.
1780          */
1781         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1782                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1783                 if (!cmd_p)
1784                         return -EINVAL;
1785
1786                 iscsit_stop_nopin_response_timer(conn);
1787
1788                 cmd_p->i_state = ISTATE_REMOVE;
1789                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1790
1791                 iscsit_start_nopin_timer(conn);
1792                 return 0;
1793         }
1794         /*
1795          * Otherwise, initiator is not expecting a NOPIN is response.
1796          * Just ignore for now.
1797          */
1798         return 0;
1799 }
1800 EXPORT_SYMBOL(iscsit_process_nop_out);
1801
1802 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1803                                  unsigned char *buf)
1804 {
1805         unsigned char *ping_data = NULL;
1806         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1807         struct kvec *iov = NULL;
1808         u32 payload_length = ntoh24(hdr->dlength);
1809         int ret;
1810
1811         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1812         if (ret < 0)
1813                 return 0;
1814         /*
1815          * Handle NOP-OUT payload for traditional iSCSI sockets
1816          */
1817         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1818                 u32 checksum, data_crc, padding = 0;
1819                 int niov = 0, rx_got, rx_size = payload_length;
1820
1821                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1822                 if (!ping_data) {
1823                         pr_err("Unable to allocate memory for"
1824                                 " NOPOUT ping data.\n");
1825                         ret = -1;
1826                         goto out;
1827                 }
1828
1829                 iov = &cmd->iov_misc[0];
1830                 iov[niov].iov_base      = ping_data;
1831                 iov[niov++].iov_len     = payload_length;
1832
1833                 padding = ((-payload_length) & 3);
1834                 if (padding != 0) {
1835                         pr_debug("Receiving %u additional bytes"
1836                                 " for padding.\n", padding);
1837                         iov[niov].iov_base      = &cmd->pad_bytes;
1838                         iov[niov++].iov_len     = padding;
1839                         rx_size += padding;
1840                 }
1841                 if (conn->conn_ops->DataDigest) {
1842                         iov[niov].iov_base      = &checksum;
1843                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1844                         rx_size += ISCSI_CRC_LEN;
1845                 }
1846
1847                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1848                 if (rx_got != rx_size) {
1849                         ret = -1;
1850                         goto out;
1851                 }
1852
1853                 if (conn->conn_ops->DataDigest) {
1854                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1855                                         ping_data, payload_length,
1856                                         padding, cmd->pad_bytes,
1857                                         (u8 *)&data_crc);
1858
1859                         if (checksum != data_crc) {
1860                                 pr_err("Ping data CRC32C DataDigest"
1861                                 " 0x%08x does not match computed 0x%08x\n",
1862                                         checksum, data_crc);
1863                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1864                                         pr_err("Unable to recover from"
1865                                         " NOPOUT Ping DataCRC failure while in"
1866                                                 " ERL=0.\n");
1867                                         ret = -1;
1868                                         goto out;
1869                                 } else {
1870                                         /*
1871                                          * Silently drop this PDU and let the
1872                                          * initiator plug the CmdSN gap.
1873                                          */
1874                                         pr_debug("Dropping NOPOUT"
1875                                         " Command CmdSN: 0x%08x due to"
1876                                         " DataCRC error.\n", hdr->cmdsn);
1877                                         ret = 0;
1878                                         goto out;
1879                                 }
1880                         } else {
1881                                 pr_debug("Got CRC32C DataDigest"
1882                                 " 0x%08x for %u bytes of ping data.\n",
1883                                         checksum, payload_length);
1884                         }
1885                 }
1886
1887                 ping_data[payload_length] = '\0';
1888                 /*
1889                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1890                  */
1891                 cmd->buf_ptr = ping_data;
1892                 cmd->buf_ptr_size = payload_length;
1893
1894                 pr_debug("Got %u bytes of NOPOUT ping"
1895                         " data.\n", payload_length);
1896                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1897         }
1898
1899         return iscsit_process_nop_out(conn, cmd, hdr);
1900 out:
1901         if (cmd)
1902                 iscsit_free_cmd(cmd, false);
1903
1904         kfree(ping_data);
1905         return ret;
1906 }
1907
1908 int
1909 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1910                            unsigned char *buf)
1911 {
1912         struct se_tmr_req *se_tmr;
1913         struct iscsi_tmr_req *tmr_req;
1914         struct iscsi_tm *hdr;
1915         int out_of_order_cmdsn = 0, ret;
1916         bool sess_ref = false;
1917         u8 function;
1918
1919         hdr                     = (struct iscsi_tm *) buf;
1920         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1921         function = hdr->flags;
1922
1923         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1924                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1925                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1926                 hdr->rtt, hdr->refcmdsn, conn->cid);
1927
1928         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1929             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1930              hdr->rtt != RESERVED_ITT)) {
1931                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1932                 hdr->rtt = RESERVED_ITT;
1933         }
1934
1935         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1936                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1937                 pr_err("Task Management Request TASK_REASSIGN not"
1938                         " issued as immediate command, bad iSCSI Initiator"
1939                                 "implementation\n");
1940                 return iscsit_add_reject_cmd(cmd,
1941                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1942         }
1943         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1944             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1945                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1946
1947         cmd->data_direction = DMA_NONE;
1948
1949         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1950         if (!cmd->tmr_req) {
1951                 pr_err("Unable to allocate memory for"
1952                         " Task Management command!\n");
1953                 return iscsit_add_reject_cmd(cmd,
1954                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1955                                              buf);
1956         }
1957
1958         /*
1959          * TASK_REASSIGN for ERL=2 / connection stays inside of
1960          * LIO-Target $FABRIC_MOD
1961          */
1962         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1963
1964                 u8 tcm_function;
1965                 int ret;
1966
1967                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1968                                       conn->sess->se_sess, 0, DMA_NONE,
1969                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1970
1971                 target_get_sess_cmd(&cmd->se_cmd, true);
1972                 sess_ref = true;
1973
1974                 switch (function) {
1975                 case ISCSI_TM_FUNC_ABORT_TASK:
1976                         tcm_function = TMR_ABORT_TASK;
1977                         break;
1978                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1979                         tcm_function = TMR_ABORT_TASK_SET;
1980                         break;
1981                 case ISCSI_TM_FUNC_CLEAR_ACA:
1982                         tcm_function = TMR_CLEAR_ACA;
1983                         break;
1984                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1985                         tcm_function = TMR_CLEAR_TASK_SET;
1986                         break;
1987                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1988                         tcm_function = TMR_LUN_RESET;
1989                         break;
1990                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1991                         tcm_function = TMR_TARGET_WARM_RESET;
1992                         break;
1993                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1994                         tcm_function = TMR_TARGET_COLD_RESET;
1995                         break;
1996                 default:
1997                         pr_err("Unknown iSCSI TMR Function:"
1998                                " 0x%02x\n", function);
1999                         return iscsit_add_reject_cmd(cmd,
2000                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2001                 }
2002
2003                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2004                                          tcm_function, GFP_KERNEL);
2005                 if (ret < 0)
2006                         return iscsit_add_reject_cmd(cmd,
2007                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2008
2009                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2010         }
2011
2012         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2013         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2014         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2015         cmd->init_task_tag      = hdr->itt;
2016         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2017         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2018         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2019         se_tmr                  = cmd->se_cmd.se_tmr_req;
2020         tmr_req                 = cmd->tmr_req;
2021         /*
2022          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2023          */
2024         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2025                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2026                                                scsilun_to_int(&hdr->lun));
2027                 if (ret < 0) {
2028                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2029                         goto attach;
2030                 }
2031         }
2032
2033         switch (function) {
2034         case ISCSI_TM_FUNC_ABORT_TASK:
2035                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2036                 if (se_tmr->response)
2037                         goto attach;
2038                 break;
2039         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2040         case ISCSI_TM_FUNC_CLEAR_ACA:
2041         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2042         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2043                 break;
2044         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2045                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2046                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2047                         goto attach;
2048                 }
2049                 break;
2050         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2051                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2052                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2053                         goto attach;
2054                 }
2055                 break;
2056         case ISCSI_TM_FUNC_TASK_REASSIGN:
2057                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2058                 /*
2059                  * Perform sanity checks on the ExpDataSN only if the
2060                  * TASK_REASSIGN was successful.
2061                  */
2062                 if (se_tmr->response)
2063                         break;
2064
2065                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2066                         return iscsit_add_reject_cmd(cmd,
2067                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2068                 break;
2069         default:
2070                 pr_err("Unknown TMR function: 0x%02x, protocol"
2071                         " error.\n", function);
2072                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2073                 goto attach;
2074         }
2075
2076         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2077             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2078                 se_tmr->call_transport = 1;
2079 attach:
2080         spin_lock_bh(&conn->cmd_lock);
2081         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2082         spin_unlock_bh(&conn->cmd_lock);
2083
2084         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2085                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2086                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2087                         out_of_order_cmdsn = 1;
2088                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2089                         return 0;
2090                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2091                         return -1;
2092         }
2093         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2094
2095         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2096                 return 0;
2097         /*
2098          * Found the referenced task, send to transport for processing.
2099          */
2100         if (se_tmr->call_transport)
2101                 return transport_generic_handle_tmr(&cmd->se_cmd);
2102
2103         /*
2104          * Could not find the referenced LUN, task, or Task Management
2105          * command not authorized or supported.  Change state and
2106          * let the tx_thread send the response.
2107          *
2108          * For connection recovery, this is also the default action for
2109          * TMR TASK_REASSIGN.
2110          */
2111         if (sess_ref) {
2112                 pr_debug("Handle TMR, using sess_ref=true check\n");
2113                 target_put_sess_cmd(&cmd->se_cmd);
2114         }
2115
2116         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2117         return 0;
2118 }
2119 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2120
2121 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2122 int
2123 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2124                       struct iscsi_text *hdr)
2125 {
2126         u32 payload_length = ntoh24(hdr->dlength);
2127
2128         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2129                 pr_err("Unable to accept text parameter length: %u"
2130                         "greater than MaxXmitDataSegmentLength %u.\n",
2131                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2132                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2133                                          (unsigned char *)hdr);
2134         }
2135
2136         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2137              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2138                 pr_err("Multi sequence text commands currently not supported\n");
2139                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2140                                         (unsigned char *)hdr);
2141         }
2142
2143         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2144                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2145                 hdr->exp_statsn, payload_length);
2146
2147         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2148         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2149         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2150         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2151         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2152         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2153         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2154         cmd->data_direction     = DMA_NONE;
2155         cmd->text_in_ptr        = NULL;
2156
2157         return 0;
2158 }
2159 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2160
2161 int
2162 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2163                         struct iscsi_text *hdr)
2164 {
2165         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2166         int cmdsn_ret;
2167
2168         if (!text_in) {
2169                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2170                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2171                         pr_err("Unable to locate text_in buffer for sendtargets"
2172                                " discovery\n");
2173                         goto reject;
2174                 }
2175                 goto empty_sendtargets;
2176         }
2177         if (strncmp("SendTargets", text_in, 11) != 0) {
2178                 pr_err("Received Text Data that is not"
2179                         " SendTargets, cannot continue.\n");
2180                 goto reject;
2181         }
2182         text_ptr = strchr(text_in, '=');
2183         if (!text_ptr) {
2184                 pr_err("No \"=\" separator found in Text Data,"
2185                         "  cannot continue.\n");
2186                 goto reject;
2187         }
2188         if (!strncmp("=All", text_ptr, 4)) {
2189                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2190         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2191                    !strncmp("=eui.", text_ptr, 5)) {
2192                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2193         } else {
2194                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2195                 goto reject;
2196         }
2197
2198         spin_lock_bh(&conn->cmd_lock);
2199         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2200         spin_unlock_bh(&conn->cmd_lock);
2201
2202 empty_sendtargets:
2203         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2204
2205         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2206                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2207                                 (unsigned char *)hdr, hdr->cmdsn);
2208                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2209                         return -1;
2210
2211                 return 0;
2212         }
2213
2214         return iscsit_execute_cmd(cmd, 0);
2215
2216 reject:
2217         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2218                                  (unsigned char *)hdr);
2219 }
2220 EXPORT_SYMBOL(iscsit_process_text_cmd);
2221
2222 static int
2223 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2224                        unsigned char *buf)
2225 {
2226         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2227         char *text_in = NULL;
2228         u32 payload_length = ntoh24(hdr->dlength);
2229         int rx_size, rc;
2230
2231         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2232         if (rc < 0)
2233                 return 0;
2234
2235         rx_size = payload_length;
2236         if (payload_length) {
2237                 u32 checksum = 0, data_crc = 0;
2238                 u32 padding = 0, pad_bytes = 0;
2239                 int niov = 0, rx_got;
2240                 struct kvec iov[3];
2241
2242                 text_in = kzalloc(payload_length, GFP_KERNEL);
2243                 if (!text_in) {
2244                         pr_err("Unable to allocate memory for"
2245                                 " incoming text parameters\n");
2246                         goto reject;
2247                 }
2248                 cmd->text_in_ptr = text_in;
2249
2250                 memset(iov, 0, 3 * sizeof(struct kvec));
2251                 iov[niov].iov_base      = text_in;
2252                 iov[niov++].iov_len     = payload_length;
2253
2254                 padding = ((-payload_length) & 3);
2255                 if (padding != 0) {
2256                         iov[niov].iov_base = &pad_bytes;
2257                         iov[niov++].iov_len  = padding;
2258                         rx_size += padding;
2259                         pr_debug("Receiving %u additional bytes"
2260                                         " for padding.\n", padding);
2261                 }
2262                 if (conn->conn_ops->DataDigest) {
2263                         iov[niov].iov_base      = &checksum;
2264                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2265                         rx_size += ISCSI_CRC_LEN;
2266                 }
2267
2268                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2269                 if (rx_got != rx_size)
2270                         goto reject;
2271
2272                 if (conn->conn_ops->DataDigest) {
2273                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2274                                         text_in, payload_length,
2275                                         padding, (u8 *)&pad_bytes,
2276                                         (u8 *)&data_crc);
2277
2278                         if (checksum != data_crc) {
2279                                 pr_err("Text data CRC32C DataDigest"
2280                                         " 0x%08x does not match computed"
2281                                         " 0x%08x\n", checksum, data_crc);
2282                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2283                                         pr_err("Unable to recover from"
2284                                         " Text Data digest failure while in"
2285                                                 " ERL=0.\n");
2286                                         goto reject;
2287                                 } else {
2288                                         /*
2289                                          * Silently drop this PDU and let the
2290                                          * initiator plug the CmdSN gap.
2291                                          */
2292                                         pr_debug("Dropping Text"
2293                                         " Command CmdSN: 0x%08x due to"
2294                                         " DataCRC error.\n", hdr->cmdsn);
2295                                         kfree(text_in);
2296                                         return 0;
2297                                 }
2298                         } else {
2299                                 pr_debug("Got CRC32C DataDigest"
2300                                         " 0x%08x for %u bytes of text data.\n",
2301                                                 checksum, payload_length);
2302                         }
2303                 }
2304                 text_in[payload_length - 1] = '\0';
2305                 pr_debug("Successfully read %d bytes of text"
2306                                 " data.\n", payload_length);
2307         }
2308
2309         return iscsit_process_text_cmd(conn, cmd, hdr);
2310
2311 reject:
2312         kfree(cmd->text_in_ptr);
2313         cmd->text_in_ptr = NULL;
2314         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2315 }
2316
2317 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2318 {
2319         struct iscsi_conn *conn_p;
2320         struct iscsi_session *sess = conn->sess;
2321
2322         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2323                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2324
2325         atomic_set(&sess->session_logout, 1);
2326         atomic_set(&conn->conn_logout_remove, 1);
2327         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2328
2329         iscsit_inc_conn_usage_count(conn);
2330         iscsit_inc_session_usage_count(sess);
2331
2332         spin_lock_bh(&sess->conn_lock);
2333         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2334                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2335                         continue;
2336
2337                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2338                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2339         }
2340         spin_unlock_bh(&sess->conn_lock);
2341
2342         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2343
2344         return 0;
2345 }
2346
2347 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2348 {
2349         struct iscsi_conn *l_conn;
2350         struct iscsi_session *sess = conn->sess;
2351
2352         pr_debug("Received logout request CLOSECONNECTION for CID:"
2353                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2354
2355         /*
2356          * A Logout Request with a CLOSECONNECTION reason code for a CID
2357          * can arrive on a connection with a differing CID.
2358          */
2359         if (conn->cid == cmd->logout_cid) {
2360                 spin_lock_bh(&conn->state_lock);
2361                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2362                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2363
2364                 atomic_set(&conn->conn_logout_remove, 1);
2365                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2366                 iscsit_inc_conn_usage_count(conn);
2367
2368                 spin_unlock_bh(&conn->state_lock);
2369         } else {
2370                 /*
2371                  * Handle all different cid CLOSECONNECTION requests in
2372                  * iscsit_logout_post_handler_diffcid() as to give enough
2373                  * time for any non immediate command's CmdSN to be
2374                  * acknowledged on the connection in question.
2375                  *
2376                  * Here we simply make sure the CID is still around.
2377                  */
2378                 l_conn = iscsit_get_conn_from_cid(sess,
2379                                 cmd->logout_cid);
2380                 if (!l_conn) {
2381                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2382                         iscsit_add_cmd_to_response_queue(cmd, conn,
2383                                         cmd->i_state);
2384                         return 0;
2385                 }
2386
2387                 iscsit_dec_conn_usage_count(l_conn);
2388         }
2389
2390         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2391
2392         return 0;
2393 }
2394
2395 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2396 {
2397         struct iscsi_session *sess = conn->sess;
2398
2399         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2400                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2401
2402         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2403                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2404                         " while ERL!=2.\n");
2405                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2406                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2407                 return 0;
2408         }
2409
2410         if (conn->cid == cmd->logout_cid) {
2411                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412                         " with CID: %hu on CID: %hu, implementation error.\n",
2413                                 cmd->logout_cid, conn->cid);
2414                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2415                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2416                 return 0;
2417         }
2418
2419         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2420
2421         return 0;
2422 }
2423
2424 int
2425 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2426                         unsigned char *buf)
2427 {
2428         int cmdsn_ret, logout_remove = 0;
2429         u8 reason_code = 0;
2430         struct iscsi_logout *hdr;
2431         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2432
2433         hdr                     = (struct iscsi_logout *) buf;
2434         reason_code             = (hdr->flags & 0x7f);
2435
2436         if (tiqn) {
2437                 spin_lock(&tiqn->logout_stats.lock);
2438                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2439                         tiqn->logout_stats.normal_logouts++;
2440                 else
2441                         tiqn->logout_stats.abnormal_logouts++;
2442                 spin_unlock(&tiqn->logout_stats.lock);
2443         }
2444
2445         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2446                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2447                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2448                 hdr->cid, conn->cid);
2449
2450         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2451                 pr_err("Received logout request on connection that"
2452                         " is not in logged in state, ignoring request.\n");
2453                 iscsit_free_cmd(cmd, false);
2454                 return 0;
2455         }
2456
2457         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2458         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2459         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2460         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2461         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2462         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2463         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2464         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2465         cmd->logout_reason      = reason_code;
2466         cmd->data_direction     = DMA_NONE;
2467
2468         /*
2469          * We need to sleep in these cases (by returning 1) until the Logout
2470          * Response gets sent in the tx thread.
2471          */
2472         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2473            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2474             be16_to_cpu(hdr->cid) == conn->cid))
2475                 logout_remove = 1;
2476
2477         spin_lock_bh(&conn->cmd_lock);
2478         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2479         spin_unlock_bh(&conn->cmd_lock);
2480
2481         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2482                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2483
2484         /*
2485          * Immediate commands are executed, well, immediately.
2486          * Non-Immediate Logout Commands are executed in CmdSN order.
2487          */
2488         if (cmd->immediate_cmd) {
2489                 int ret = iscsit_execute_cmd(cmd, 0);
2490
2491                 if (ret < 0)
2492                         return ret;
2493         } else {
2494                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2495                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2496                         logout_remove = 0;
2497                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2498                         return -1;
2499         }
2500
2501         return logout_remove;
2502 }
2503 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2504
2505 int iscsit_handle_snack(
2506         struct iscsi_conn *conn,
2507         unsigned char *buf)
2508 {
2509         struct iscsi_snack *hdr;
2510
2511         hdr                     = (struct iscsi_snack *) buf;
2512         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2513
2514         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2515                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2516                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2517                         hdr->begrun, hdr->runlength, conn->cid);
2518
2519         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2520                 pr_err("Initiator sent SNACK request while in"
2521                         " ErrorRecoveryLevel=0.\n");
2522                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2523                                          buf);
2524         }
2525         /*
2526          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2527          * call from inside iscsi_send_recovery_datain_or_r2t().
2528          */
2529         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2530         case 0:
2531                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2532                         hdr->itt,
2533                         be32_to_cpu(hdr->ttt),
2534                         be32_to_cpu(hdr->begrun),
2535                         be32_to_cpu(hdr->runlength));
2536         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2537                 return iscsit_handle_status_snack(conn, hdr->itt,
2538                         be32_to_cpu(hdr->ttt),
2539                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2540         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2541                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2542                         be32_to_cpu(hdr->begrun),
2543                         be32_to_cpu(hdr->runlength));
2544         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2545                 /* FIXME: Support R-Data SNACK */
2546                 pr_err("R-Data SNACK Not Supported.\n");
2547                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2548                                          buf);
2549         default:
2550                 pr_err("Unknown SNACK type 0x%02x, protocol"
2551                         " error.\n", hdr->flags & 0x0f);
2552                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2553                                          buf);
2554         }
2555
2556         return 0;
2557 }
2558 EXPORT_SYMBOL(iscsit_handle_snack);
2559
2560 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2561 {
2562         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2563             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2564                 wait_for_completion_interruptible_timeout(
2565                                         &conn->rx_half_close_comp,
2566                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2567         }
2568 }
2569
2570 static int iscsit_handle_immediate_data(
2571         struct iscsi_cmd *cmd,
2572         struct iscsi_scsi_req *hdr,
2573         u32 length)
2574 {
2575         int iov_ret, rx_got = 0, rx_size = 0;
2576         u32 checksum, iov_count = 0, padding = 0;
2577         struct iscsi_conn *conn = cmd->conn;
2578         struct kvec *iov;
2579
2580         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2581         if (iov_ret < 0)
2582                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2583
2584         rx_size = length;
2585         iov_count = iov_ret;
2586         iov = &cmd->iov_data[0];
2587
2588         padding = ((-length) & 3);
2589         if (padding != 0) {
2590                 iov[iov_count].iov_base = cmd->pad_bytes;
2591                 iov[iov_count++].iov_len = padding;
2592                 rx_size += padding;
2593         }
2594
2595         if (conn->conn_ops->DataDigest) {
2596                 iov[iov_count].iov_base         = &checksum;
2597                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2598                 rx_size += ISCSI_CRC_LEN;
2599         }
2600
2601         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2602
2603         iscsit_unmap_iovec(cmd);
2604
2605         if (rx_got != rx_size) {
2606                 iscsit_rx_thread_wait_for_tcp(conn);
2607                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2608         }
2609
2610         if (conn->conn_ops->DataDigest) {
2611                 u32 data_crc;
2612
2613                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2614                                                     cmd->write_data_done, length, padding,
2615                                                     cmd->pad_bytes);
2616
2617                 if (checksum != data_crc) {
2618                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2619                                 " does not match computed 0x%08x\n", checksum,
2620                                 data_crc);
2621
2622                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2623                                 pr_err("Unable to recover from"
2624                                         " Immediate Data digest failure while"
2625                                         " in ERL=0.\n");
2626                                 iscsit_reject_cmd(cmd,
2627                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2628                                                 (unsigned char *)hdr);
2629                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2630                         } else {
2631                                 iscsit_reject_cmd(cmd,
2632                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2633                                                 (unsigned char *)hdr);
2634                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2635                         }
2636                 } else {
2637                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2638                                 " %u bytes of Immediate Data\n", checksum,
2639                                 length);
2640                 }
2641         }
2642
2643         cmd->write_data_done += length;
2644
2645         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2646                 spin_lock_bh(&cmd->istate_lock);
2647                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2648                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2649                 spin_unlock_bh(&cmd->istate_lock);
2650         }
2651
2652         return IMMEDIATE_DATA_NORMAL_OPERATION;
2653 }
2654
2655 /*
2656  *      Called with sess->conn_lock held.
2657  */
2658 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2659         with active network interface */
2660 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2661 {
2662         struct iscsi_cmd *cmd;
2663         struct iscsi_conn *conn_p;
2664         bool found = false;
2665
2666         /*
2667          * Only send a Asynchronous Message on connections whos network
2668          * interface is still functional.
2669          */
2670         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2671                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2672                         iscsit_inc_conn_usage_count(conn_p);
2673                         found = true;
2674                         break;
2675                 }
2676         }
2677
2678         if (!found)
2679                 return;
2680
2681         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2682         if (!cmd) {
2683                 iscsit_dec_conn_usage_count(conn_p);
2684                 return;
2685         }
2686
2687         cmd->logout_cid = conn->cid;
2688         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2689         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2690
2691         spin_lock_bh(&conn_p->cmd_lock);
2692         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2693         spin_unlock_bh(&conn_p->cmd_lock);
2694
2695         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2696         iscsit_dec_conn_usage_count(conn_p);
2697 }
2698
2699 static int iscsit_send_conn_drop_async_message(
2700         struct iscsi_cmd *cmd,
2701         struct iscsi_conn *conn)
2702 {
2703         struct iscsi_async *hdr;
2704
2705         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2706
2707         hdr                     = (struct iscsi_async *) cmd->pdu;
2708         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2709         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2710         cmd->init_task_tag      = RESERVED_ITT;
2711         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2712         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2713         cmd->stat_sn            = conn->stat_sn++;
2714         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2715         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2716         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2717         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2718         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2719         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2720         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2721
2722         pr_debug("Sending Connection Dropped Async Message StatSN:"
2723                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2724                         cmd->logout_cid, conn->cid);
2725
2726         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2727 }
2728
2729 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2730 {
2731         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2732             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2733                 wait_for_completion_interruptible_timeout(
2734                                         &conn->tx_half_close_comp,
2735                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2736         }
2737 }
2738
2739 void
2740 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2741                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2742                         bool set_statsn)
2743 {
2744         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2745         hdr->flags              = datain->flags;
2746         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2747                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2748                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2749                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2750                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2751                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2752                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2753                 }
2754         }
2755         hton24(hdr->dlength, datain->length);
2756         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2757                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2758                                 (struct scsi_lun *)&hdr->lun);
2759         else
2760                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2761
2762         hdr->itt                = cmd->init_task_tag;
2763
2764         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2765                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2766         else
2767                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2768         if (set_statsn)
2769                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2770         else
2771                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2772
2773         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2774         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2775         hdr->datasn             = cpu_to_be32(datain->data_sn);
2776         hdr->offset             = cpu_to_be32(datain->offset);
2777
2778         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2779                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2780                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2781                 ntohl(hdr->offset), datain->length, conn->cid);
2782 }
2783 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2784
2785 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2786 {
2787         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2788         struct iscsi_datain datain;
2789         struct iscsi_datain_req *dr;
2790         int eodr = 0, ret;
2791         bool set_statsn = false;
2792
2793         memset(&datain, 0, sizeof(struct iscsi_datain));
2794         dr = iscsit_get_datain_values(cmd, &datain);
2795         if (!dr) {
2796                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2797                                 cmd->init_task_tag);
2798                 return -1;
2799         }
2800         /*
2801          * Be paranoid and double check the logic for now.
2802          */
2803         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2804                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2805                         " datain.length: %u exceeds cmd->data_length: %u\n",
2806                         cmd->init_task_tag, datain.offset, datain.length,
2807                         cmd->se_cmd.data_length);
2808                 return -1;
2809         }
2810
2811         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2812         /*
2813          * Special case for successfully execution w/ both DATAIN
2814          * and Sense Data.
2815          */
2816         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2817             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2818                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2819         else {
2820                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2821                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2822                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2823                         cmd->stat_sn = conn->stat_sn++;
2824                         set_statsn = true;
2825                 } else if (dr->dr_complete ==
2826                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2827                         set_statsn = true;
2828         }
2829
2830         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2831
2832         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2833         if (ret < 0)
2834                 return ret;
2835
2836         if (dr->dr_complete) {
2837                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2838                                 2 : 1;
2839                 iscsit_free_datain_req(cmd, dr);
2840         }
2841
2842         return eodr;
2843 }
2844
2845 int
2846 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2847                         struct iscsi_logout_rsp *hdr)
2848 {
2849         struct iscsi_conn *logout_conn = NULL;
2850         struct iscsi_conn_recovery *cr = NULL;
2851         struct iscsi_session *sess = conn->sess;
2852         /*
2853          * The actual shutting down of Sessions and/or Connections
2854          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2855          * is done in scsi_logout_post_handler().
2856          */
2857         switch (cmd->logout_reason) {
2858         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2859                 pr_debug("iSCSI session logout successful, setting"
2860                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2861                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2862                 break;
2863         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2864                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2865                         break;
2866                 /*
2867                  * For CLOSECONNECTION logout requests carrying
2868                  * a matching logout CID -> local CID, the reference
2869                  * for the local CID will have been incremented in
2870                  * iscsi_logout_closeconnection().
2871                  *
2872                  * For CLOSECONNECTION logout requests carrying
2873                  * a different CID than the connection it arrived
2874                  * on, the connection responding to cmd->logout_cid
2875                  * is stopped in iscsit_logout_post_handler_diffcid().
2876                  */
2877
2878                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2879                         " successful.\n", cmd->logout_cid, conn->cid);
2880                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2881                 break;
2882         case ISCSI_LOGOUT_REASON_RECOVERY:
2883                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2884                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2885                         break;
2886                 /*
2887                  * If the connection is still active from our point of view
2888                  * force connection recovery to occur.
2889                  */
2890                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2891                                 cmd->logout_cid);
2892                 if (logout_conn) {
2893                         iscsit_connection_reinstatement_rcfr(logout_conn);
2894                         iscsit_dec_conn_usage_count(logout_conn);
2895                 }
2896
2897                 cr = iscsit_get_inactive_connection_recovery_entry(
2898                                 conn->sess, cmd->logout_cid);
2899                 if (!cr) {
2900                         pr_err("Unable to locate CID: %hu for"
2901                         " REMOVECONNFORRECOVERY Logout Request.\n",
2902                                 cmd->logout_cid);
2903                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2904                         break;
2905                 }
2906
2907                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2908
2909                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2910                         " for recovery for CID: %hu on CID: %hu successful.\n",
2911                                 cmd->logout_cid, conn->cid);
2912                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2913                 break;
2914         default:
2915                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2916                                 cmd->logout_reason);
2917                 return -1;
2918         }
2919
2920         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2921         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2922         hdr->response           = cmd->logout_response;
2923         hdr->itt                = cmd->init_task_tag;
2924         cmd->stat_sn            = conn->stat_sn++;
2925         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2926
2927         iscsit_increment_maxcmdsn(cmd, conn->sess);
2928         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2929         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2930
2931         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2932                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2933                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2934                 cmd->logout_cid, conn->cid);
2935
2936         return 0;
2937 }
2938 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2939
2940 static int
2941 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2942 {
2943         int rc;
2944
2945         rc = iscsit_build_logout_rsp(cmd, conn,
2946                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2947         if (rc < 0)
2948                 return rc;
2949
2950         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2951 }
2952
2953 void
2954 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2955                        struct iscsi_nopin *hdr, bool nopout_response)
2956 {
2957         hdr->opcode             = ISCSI_OP_NOOP_IN;
2958         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2959         hton24(hdr->dlength, cmd->buf_ptr_size);
2960         if (nopout_response)
2961                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2962         hdr->itt                = cmd->init_task_tag;
2963         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2964         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2965                                   conn->stat_sn;
2966         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2967
2968         if (nopout_response)
2969                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2970
2971         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2972         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2973
2974         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2975                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2976                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2977                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2978 }
2979 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2980
2981 /*
2982  *      Unsolicited NOPIN, either requesting a response or not.
2983  */
2984 static int iscsit_send_unsolicited_nopin(
2985         struct iscsi_cmd *cmd,
2986         struct iscsi_conn *conn,
2987         int want_response)
2988 {
2989         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2990         int ret;
2991
2992         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2993
2994         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2995                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2996
2997         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2998         if (ret < 0)
2999                 return ret;
3000
3001         spin_lock_bh(&cmd->istate_lock);
3002         cmd->i_state = want_response ?
3003                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3004         spin_unlock_bh(&cmd->istate_lock);
3005
3006         return 0;
3007 }
3008
3009 static int
3010 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3011 {
3012         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3013
3014         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3015
3016         /*
3017          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3018          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3019          */
3020         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3021
3022         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3023                                                      cmd->buf_ptr,
3024                                                      cmd->buf_ptr_size);
3025 }
3026
3027 static int iscsit_send_r2t(
3028         struct iscsi_cmd *cmd,
3029         struct iscsi_conn *conn)
3030 {
3031         struct iscsi_r2t *r2t;
3032         struct iscsi_r2t_rsp *hdr;
3033         int ret;
3034
3035         r2t = iscsit_get_r2t_from_list(cmd);
3036         if (!r2t)
3037                 return -1;
3038
3039         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3040         memset(hdr, 0, ISCSI_HDR_LEN);
3041         hdr->opcode             = ISCSI_OP_R2T;
3042         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3043         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3044                         (struct scsi_lun *)&hdr->lun);
3045         hdr->itt                = cmd->init_task_tag;
3046         if (conn->conn_transport->iscsit_get_r2t_ttt)
3047                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3048         else
3049                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3050         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3051         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3052         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3053         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3054         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3055         hdr->data_offset        = cpu_to_be32(r2t->offset);
3056         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3057
3058         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3059                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3060                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3061                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3062                         r2t->offset, r2t->xfer_len, conn->cid);
3063
3064         spin_lock_bh(&cmd->r2t_lock);
3065         r2t->sent_r2t = 1;
3066         spin_unlock_bh(&cmd->r2t_lock);
3067
3068         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3069         if (ret < 0) {
3070                 return ret;
3071         }
3072
3073         spin_lock_bh(&cmd->dataout_timeout_lock);
3074         iscsit_start_dataout_timer(cmd, conn);
3075         spin_unlock_bh(&cmd->dataout_timeout_lock);
3076
3077         return 0;
3078 }
3079
3080 /*
3081  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3082  *              connection recovery.
3083  */
3084 int iscsit_build_r2ts_for_cmd(
3085         struct iscsi_conn *conn,
3086         struct iscsi_cmd *cmd,
3087         bool recovery)
3088 {
3089         int first_r2t = 1;
3090         u32 offset = 0, xfer_len = 0;
3091
3092         spin_lock_bh(&cmd->r2t_lock);
3093         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3094                 spin_unlock_bh(&cmd->r2t_lock);
3095                 return 0;
3096         }
3097
3098         if (conn->sess->sess_ops->DataSequenceInOrder &&
3099             !recovery)
3100                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3101
3102         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3103                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3104                         offset = cmd->r2t_offset;
3105
3106                         if (first_r2t && recovery) {
3107                                 int new_data_end = offset +
3108                                         conn->sess->sess_ops->MaxBurstLength -
3109                                         cmd->next_burst_len;
3110
3111                                 if (new_data_end > cmd->se_cmd.data_length)
3112                                         xfer_len = cmd->se_cmd.data_length - offset;
3113                                 else
3114                                         xfer_len =
3115                                                 conn->sess->sess_ops->MaxBurstLength -
3116                                                 cmd->next_burst_len;
3117                         } else {
3118                                 int new_data_end = offset +
3119                                         conn->sess->sess_ops->MaxBurstLength;
3120
3121                                 if (new_data_end > cmd->se_cmd.data_length)
3122                                         xfer_len = cmd->se_cmd.data_length - offset;
3123                                 else
3124                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3125                         }
3126                         cmd->r2t_offset += xfer_len;
3127
3128                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3129                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3130                 } else {
3131                         struct iscsi_seq *seq;
3132
3133                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3134                         if (!seq) {
3135                                 spin_unlock_bh(&cmd->r2t_lock);
3136                                 return -1;
3137                         }
3138
3139                         offset = seq->offset;
3140                         xfer_len = seq->xfer_len;
3141
3142                         if (cmd->seq_send_order == cmd->seq_count)
3143                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3144                 }
3145                 cmd->outstanding_r2ts++;
3146                 first_r2t = 0;
3147
3148                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3149                         spin_unlock_bh(&cmd->r2t_lock);
3150                         return -1;
3151                 }
3152
3153                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3154                         break;
3155         }
3156         spin_unlock_bh(&cmd->r2t_lock);
3157
3158         return 0;
3159 }
3160 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3161
3162 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3163                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3164 {
3165         if (inc_stat_sn)
3166                 cmd->stat_sn = conn->stat_sn++;
3167
3168         atomic_long_inc(&conn->sess->rsp_pdus);
3169
3170         memset(hdr, 0, ISCSI_HDR_LEN);
3171         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3172         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3173         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3174                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3175                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3176         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3177                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3178                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3179         }
3180         hdr->response           = cmd->iscsi_response;
3181         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3182         hdr->itt                = cmd->init_task_tag;
3183         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3184
3185         iscsit_increment_maxcmdsn(cmd, conn->sess);
3186         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3187         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3188
3189         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3190                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3191                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3192                 cmd->se_cmd.scsi_status, conn->cid);
3193 }
3194 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3195
3196 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3197 {
3198         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3199         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3200         void *data_buf = NULL;
3201         u32 padding = 0, data_buf_len = 0;
3202
3203         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3204
3205         /*
3206          * Attach SENSE DATA payload to iSCSI Response PDU
3207          */
3208         if (cmd->se_cmd.sense_buffer &&
3209            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3210             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3211                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3212                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3213
3214                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3215                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3216                 data_buf = cmd->sense_buffer;
3217                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3218
3219                 if (padding) {
3220                         memset(cmd->sense_buffer +
3221                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3222                         pr_debug("Adding %u bytes of padding to"
3223                                 " SENSE.\n", padding);
3224                 }
3225
3226                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3227                                 " Response PDU\n",
3228                                 cmd->se_cmd.scsi_sense_length);
3229         }
3230
3231         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3232                                                      data_buf_len);
3233 }
3234
3235 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3236 {
3237         switch (se_tmr->response) {
3238         case TMR_FUNCTION_COMPLETE:
3239                 return ISCSI_TMF_RSP_COMPLETE;
3240         case TMR_TASK_DOES_NOT_EXIST:
3241                 return ISCSI_TMF_RSP_NO_TASK;
3242         case TMR_LUN_DOES_NOT_EXIST:
3243                 return ISCSI_TMF_RSP_NO_LUN;
3244         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3245                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3246         case TMR_FUNCTION_REJECTED:
3247         default:
3248                 return ISCSI_TMF_RSP_REJECTED;
3249         }
3250 }
3251
3252 void
3253 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3254                           struct iscsi_tm_rsp *hdr)
3255 {
3256         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3257
3258         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3259         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3260         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3261         hdr->itt                = cmd->init_task_tag;
3262         cmd->stat_sn            = conn->stat_sn++;
3263         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3264
3265         iscsit_increment_maxcmdsn(cmd, conn->sess);
3266         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3267         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3268
3269         pr_debug("Built Task Management Response ITT: 0x%08x,"
3270                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3271                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3272 }
3273 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3274
3275 static int
3276 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3277 {
3278         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3279
3280         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3281
3282         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3283 }
3284
3285 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3286 {
3287         bool ret = false;
3288
3289         if (np->np_sockaddr.ss_family == AF_INET6) {
3290                 const struct sockaddr_in6 sin6 = {
3291                         .sin6_addr = IN6ADDR_ANY_INIT };
3292                 struct sockaddr_in6 *sock_in6 =
3293                          (struct sockaddr_in6 *)&np->np_sockaddr;
3294
3295                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3296                                 sin6.sin6_addr.s6_addr, 16))
3297                         ret = true;
3298         } else {
3299                 struct sockaddr_in * sock_in =
3300                         (struct sockaddr_in *)&np->np_sockaddr;
3301
3302                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3303                         ret = true;
3304         }
3305
3306         return ret;
3307 }
3308
3309 #define SENDTARGETS_BUF_LIMIT 32768U
3310
3311 static int
3312 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3313                                   enum iscsit_transport_type network_transport,
3314                                   int skip_bytes, bool *completed)
3315 {
3316         char *payload = NULL;
3317         struct iscsi_conn *conn = cmd->conn;
3318         struct iscsi_portal_group *tpg;
3319         struct iscsi_tiqn *tiqn;
3320         struct iscsi_tpg_np *tpg_np;
3321         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3322         int target_name_printed;
3323         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3324         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3325         bool active;
3326
3327         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3328                          SENDTARGETS_BUF_LIMIT);
3329
3330         payload = kzalloc(buffer_len, GFP_KERNEL);
3331         if (!payload) {
3332                 pr_err("Unable to allocate memory for sendtargets"
3333                                 " response.\n");
3334                 return -ENOMEM;
3335         }
3336         /*
3337          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3338          * explicit case..
3339          */
3340         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3341                 text_ptr = strchr(text_in, '=');
3342                 if (!text_ptr) {
3343                         pr_err("Unable to locate '=' string in text_in:"
3344                                " %s\n", text_in);
3345                         kfree(payload);
3346                         return -EINVAL;
3347                 }
3348                 /*
3349                  * Skip over '=' character..
3350                  */
3351                 text_ptr += 1;
3352         }
3353
3354         spin_lock(&tiqn_lock);
3355         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3356                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3357                      strcmp(tiqn->tiqn, text_ptr)) {
3358                         continue;
3359                 }
3360
3361                 target_name_printed = 0;
3362
3363                 spin_lock(&tiqn->tiqn_tpg_lock);
3364                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3365
3366                         /* If demo_mode_discovery=0 and generate_node_acls=0
3367                          * (demo mode dislabed) do not return
3368                          * TargetName+TargetAddress unless a NodeACL exists.
3369                          */
3370
3371                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3372                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3373                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3374                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3375                                 continue;
3376                         }
3377
3378                         spin_lock(&tpg->tpg_state_lock);
3379                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3380                         spin_unlock(&tpg->tpg_state_lock);
3381
3382                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3383                                 continue;
3384
3385                         spin_lock(&tpg->tpg_np_lock);
3386                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3387                                                 tpg_np_list) {
3388                                 struct iscsi_np *np = tpg_np->tpg_np;
3389                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3390                                 struct sockaddr_storage *sockaddr;
3391
3392                                 if (np->np_network_transport != network_transport)
3393                                         continue;
3394
3395                                 if (!target_name_printed) {
3396                                         len = sprintf(buf, "TargetName=%s",
3397                                                       tiqn->tiqn);
3398                                         len += 1;
3399
3400                                         if ((len + payload_len) > buffer_len) {
3401                                                 spin_unlock(&tpg->tpg_np_lock);
3402                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3403                                                 end_of_buf = 1;
3404                                                 goto eob;
3405                                         }
3406
3407                                         if (skip_bytes && len <= skip_bytes) {
3408                                                 skip_bytes -= len;
3409                                         } else {
3410                                                 memcpy(payload + payload_len, buf, len);
3411                                                 payload_len += len;
3412                                                 target_name_printed = 1;
3413                                                 if (len > skip_bytes)
3414                                                         skip_bytes = 0;
3415                                         }
3416                                 }
3417
3418                                 if (inaddr_any)
3419                                         sockaddr = &conn->local_sockaddr;
3420                                 else
3421                                         sockaddr = &np->np_sockaddr;
3422
3423                                 len = sprintf(buf, "TargetAddress="
3424                                               "%pISpc,%hu",
3425                                               sockaddr,
3426                                               tpg->tpgt);
3427                                 len += 1;
3428
3429                                 if ((len + payload_len) > buffer_len) {
3430                                         spin_unlock(&tpg->tpg_np_lock);
3431                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3432                                         end_of_buf = 1;
3433                                         goto eob;
3434                                 }
3435
3436                                 if (skip_bytes && len <= skip_bytes) {
3437                                         skip_bytes -= len;
3438                                 } else {
3439                                         memcpy(payload + payload_len, buf, len);
3440                                         payload_len += len;
3441                                         if (len > skip_bytes)
3442                                                 skip_bytes = 0;
3443                                 }
3444                         }
3445                         spin_unlock(&tpg->tpg_np_lock);
3446                 }
3447                 spin_unlock(&tiqn->tiqn_tpg_lock);
3448 eob:
3449                 if (end_of_buf) {
3450                         *completed = false;
3451                         break;
3452                 }
3453
3454                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3455                         break;
3456         }
3457         spin_unlock(&tiqn_lock);
3458
3459         cmd->buf_ptr = payload;
3460
3461         return payload_len;
3462 }
3463
3464 int
3465 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3466                       struct iscsi_text_rsp *hdr,
3467                       enum iscsit_transport_type network_transport)
3468 {
3469         int text_length, padding;
3470         bool completed = true;
3471
3472         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3473                                                         cmd->read_data_done,
3474                                                         &completed);
3475         if (text_length < 0)
3476                 return text_length;
3477
3478         if (completed) {
3479                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3480         } else {
3481                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3482                 cmd->read_data_done += text_length;
3483                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3484                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3485         }
3486         hdr->opcode = ISCSI_OP_TEXT_RSP;
3487         padding = ((-text_length) & 3);
3488         hton24(hdr->dlength, text_length);
3489         hdr->itt = cmd->init_task_tag;
3490         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3491         cmd->stat_sn = conn->stat_sn++;
3492         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3493
3494         iscsit_increment_maxcmdsn(cmd, conn->sess);
3495         /*
3496          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3497          * correctly increment MaxCmdSN for each response answering a
3498          * non immediate text request with a valid CmdSN.
3499          */
3500         cmd->maxcmdsn_inc = 0;
3501         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3502         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3503
3504         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3505                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3506                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3507                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3508                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3509
3510         return text_length + padding;
3511 }
3512 EXPORT_SYMBOL(iscsit_build_text_rsp);
3513
3514 static int iscsit_send_text_rsp(
3515         struct iscsi_cmd *cmd,
3516         struct iscsi_conn *conn)
3517 {
3518         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3519         int text_length;
3520
3521         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3522                                 conn->conn_transport->transport_type);
3523         if (text_length < 0)
3524                 return text_length;
3525
3526         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3527                                                      cmd->buf_ptr,
3528                                                      text_length);
3529 }
3530
3531 void
3532 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3533                     struct iscsi_reject *hdr)
3534 {
3535         hdr->opcode             = ISCSI_OP_REJECT;
3536         hdr->reason             = cmd->reject_reason;
3537         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3538         hton24(hdr->dlength, ISCSI_HDR_LEN);
3539         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3540         cmd->stat_sn            = conn->stat_sn++;
3541         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3542         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3543         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3544
3545 }
3546 EXPORT_SYMBOL(iscsit_build_reject);
3547
3548 static int iscsit_send_reject(
3549         struct iscsi_cmd *cmd,
3550         struct iscsi_conn *conn)
3551 {
3552         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3553
3554         iscsit_build_reject(cmd, conn, hdr);
3555
3556         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3557                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3558
3559         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3560                                                      cmd->buf_ptr,
3561                                                      ISCSI_HDR_LEN);
3562 }
3563
3564 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3565 {
3566         int ord, cpu;
3567         /*
3568          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3569          * within iscsit_start_kthreads()
3570          *
3571          * Here we use bitmap_id to determine which CPU that this
3572          * iSCSI connection's RX/TX threads will be scheduled to
3573          * execute upon.
3574          */
3575         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3576         for_each_online_cpu(cpu) {
3577                 if (ord-- == 0) {
3578                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3579                         return;
3580                 }
3581         }
3582         /*
3583          * This should never be reached..
3584          */
3585         dump_stack();
3586         cpumask_setall(conn->conn_cpumask);
3587 }
3588
3589 int
3590 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3591 {
3592         int ret;
3593
3594         switch (state) {
3595         case ISTATE_SEND_R2T:
3596                 ret = iscsit_send_r2t(cmd, conn);
3597                 if (ret < 0)
3598                         goto err;
3599                 break;
3600         case ISTATE_REMOVE:
3601                 spin_lock_bh(&conn->cmd_lock);
3602                 list_del_init(&cmd->i_conn_node);
3603                 spin_unlock_bh(&conn->cmd_lock);
3604
3605                 iscsit_free_cmd(cmd, false);
3606                 break;
3607         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3608                 iscsit_mod_nopin_response_timer(conn);
3609                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3610                 if (ret < 0)
3611                         goto err;
3612                 break;
3613         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3614                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3615                 if (ret < 0)
3616                         goto err;
3617                 break;
3618         default:
3619                 pr_err("Unknown Opcode: 0x%02x ITT:"
3620                        " 0x%08x, i_state: %d on CID: %hu\n",
3621                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3622                        conn->cid);
3623                 goto err;
3624         }
3625
3626         return 0;
3627
3628 err:
3629         return -1;
3630 }
3631 EXPORT_SYMBOL(iscsit_immediate_queue);
3632
3633 static int
3634 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3635 {
3636         struct iscsit_transport *t = conn->conn_transport;
3637         struct iscsi_queue_req *qr;
3638         struct iscsi_cmd *cmd;
3639         u8 state;
3640         int ret;
3641
3642         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3643                 atomic_set(&conn->check_immediate_queue, 0);
3644                 cmd = qr->cmd;
3645                 state = qr->state;
3646                 kmem_cache_free(lio_qr_cache, qr);
3647
3648                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3649                 if (ret < 0)
3650                         return ret;
3651         }
3652
3653         return 0;
3654 }
3655
3656 int
3657 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3658 {
3659         int ret;
3660
3661 check_rsp_state:
3662         switch (state) {
3663         case ISTATE_SEND_DATAIN:
3664                 ret = iscsit_send_datain(cmd, conn);
3665                 if (ret < 0)
3666                         goto err;
3667                 else if (!ret)
3668                         /* more drs */
3669                         goto check_rsp_state;
3670                 else if (ret == 1) {
3671                         /* all done */
3672                         spin_lock_bh(&cmd->istate_lock);
3673                         cmd->i_state = ISTATE_SENT_STATUS;
3674                         spin_unlock_bh(&cmd->istate_lock);
3675
3676                         if (atomic_read(&conn->check_immediate_queue))
3677                                 return 1;
3678
3679                         return 0;
3680                 } else if (ret == 2) {
3681                         /* Still must send status,
3682                            SCF_TRANSPORT_TASK_SENSE was set */
3683                         spin_lock_bh(&cmd->istate_lock);
3684                         cmd->i_state = ISTATE_SEND_STATUS;
3685                         spin_unlock_bh(&cmd->istate_lock);
3686                         state = ISTATE_SEND_STATUS;
3687                         goto check_rsp_state;
3688                 }
3689
3690                 break;
3691         case ISTATE_SEND_STATUS:
3692         case ISTATE_SEND_STATUS_RECOVERY:
3693                 ret = iscsit_send_response(cmd, conn);
3694                 break;
3695         case ISTATE_SEND_LOGOUTRSP:
3696                 ret = iscsit_send_logout(cmd, conn);
3697                 break;
3698         case ISTATE_SEND_ASYNCMSG:
3699                 ret = iscsit_send_conn_drop_async_message(
3700                         cmd, conn);
3701                 break;
3702         case ISTATE_SEND_NOPIN:
3703                 ret = iscsit_send_nopin(cmd, conn);
3704                 break;
3705         case ISTATE_SEND_REJECT:
3706                 ret = iscsit_send_reject(cmd, conn);
3707                 break;
3708         case ISTATE_SEND_TASKMGTRSP:
3709                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3710                 if (ret != 0)
3711                         break;
3712                 ret = iscsit_tmr_post_handler(cmd, conn);
3713                 if (ret != 0)
3714                         iscsit_fall_back_to_erl0(conn->sess);
3715                 break;
3716         case ISTATE_SEND_TEXTRSP:
3717                 ret = iscsit_send_text_rsp(cmd, conn);
3718                 break;
3719         default:
3720                 pr_err("Unknown Opcode: 0x%02x ITT:"
3721                        " 0x%08x, i_state: %d on CID: %hu\n",
3722                        cmd->iscsi_opcode, cmd->init_task_tag,
3723                        state, conn->cid);
3724                 goto err;
3725         }
3726         if (ret < 0)
3727                 goto err;
3728
3729         switch (state) {
3730         case ISTATE_SEND_LOGOUTRSP:
3731                 if (!iscsit_logout_post_handler(cmd, conn))
3732                         return -ECONNRESET;
3733                 /* fall through */
3734         case ISTATE_SEND_STATUS:
3735         case ISTATE_SEND_ASYNCMSG:
3736         case ISTATE_SEND_NOPIN:
3737         case ISTATE_SEND_STATUS_RECOVERY:
3738         case ISTATE_SEND_TEXTRSP:
3739         case ISTATE_SEND_TASKMGTRSP:
3740         case ISTATE_SEND_REJECT:
3741                 spin_lock_bh(&cmd->istate_lock);
3742                 cmd->i_state = ISTATE_SENT_STATUS;
3743                 spin_unlock_bh(&cmd->istate_lock);
3744                 break;
3745         default:
3746                 pr_err("Unknown Opcode: 0x%02x ITT:"
3747                        " 0x%08x, i_state: %d on CID: %hu\n",
3748                        cmd->iscsi_opcode, cmd->init_task_tag,
3749                        cmd->i_state, conn->cid);
3750                 goto err;
3751         }
3752
3753         if (atomic_read(&conn->check_immediate_queue))
3754                 return 1;
3755
3756         return 0;
3757
3758 err:
3759         return -1;
3760 }
3761 EXPORT_SYMBOL(iscsit_response_queue);
3762
3763 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3764 {
3765         struct iscsit_transport *t = conn->conn_transport;
3766         struct iscsi_queue_req *qr;
3767         struct iscsi_cmd *cmd;
3768         u8 state;
3769         int ret;
3770
3771         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3772                 cmd = qr->cmd;
3773                 state = qr->state;
3774                 kmem_cache_free(lio_qr_cache, qr);
3775
3776                 ret = t->iscsit_response_queue(conn, cmd, state);
3777                 if (ret == 1 || ret < 0)
3778                         return ret;
3779         }
3780
3781         return 0;
3782 }
3783
3784 int iscsi_target_tx_thread(void *arg)
3785 {
3786         int ret = 0;
3787         struct iscsi_conn *conn = arg;
3788         /*
3789          * Allow ourselves to be interrupted by SIGINT so that a
3790          * connection recovery / failure event can be triggered externally.
3791          */
3792         allow_signal(SIGINT);
3793
3794         while (!kthread_should_stop()) {
3795                 /*
3796                  * Ensure that both TX and RX per connection kthreads
3797                  * are scheduled to run on the same CPU.
3798                  */
3799                 iscsit_thread_check_cpumask(conn, current, 1);
3800
3801                 wait_event_interruptible(conn->queues_wq,
3802                                          !iscsit_conn_all_queues_empty(conn));
3803
3804                 if (signal_pending(current))
3805                         goto transport_err;
3806
3807 get_immediate:
3808                 ret = iscsit_handle_immediate_queue(conn);
3809                 if (ret < 0)
3810                         goto transport_err;
3811
3812                 ret = iscsit_handle_response_queue(conn);
3813                 if (ret == 1)
3814                         goto get_immediate;
3815                 else if (ret == -ECONNRESET)
3816                         goto out;
3817                 else if (ret < 0)
3818                         goto transport_err;
3819         }
3820
3821 transport_err:
3822         /*
3823          * Avoid the normal connection failure code-path if this connection
3824          * is still within LOGIN mode, and iscsi_np process context is
3825          * responsible for cleaning up the early connection failure.
3826          */
3827         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3828                 iscsit_take_action_for_connection_exit(conn);
3829 out:
3830         return 0;
3831 }
3832
3833 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3834 {
3835         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3836         struct iscsi_cmd *cmd;
3837         int ret = 0;
3838
3839         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3840         case ISCSI_OP_SCSI_CMD:
3841                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3842                 if (!cmd)
3843                         goto reject;
3844
3845                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3846                 break;
3847         case ISCSI_OP_SCSI_DATA_OUT:
3848                 ret = iscsit_handle_data_out(conn, buf);
3849                 break;
3850         case ISCSI_OP_NOOP_OUT:
3851                 cmd = NULL;
3852                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3853                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3854                         if (!cmd)
3855                                 goto reject;
3856                 }
3857                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3858                 break;
3859         case ISCSI_OP_SCSI_TMFUNC:
3860                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3861                 if (!cmd)
3862                         goto reject;
3863
3864                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3865                 break;
3866         case ISCSI_OP_TEXT:
3867                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3868                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3869                         if (!cmd)
3870                                 goto reject;
3871                 } else {
3872                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3873                         if (!cmd)
3874                                 goto reject;
3875                 }
3876
3877                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3878                 break;
3879         case ISCSI_OP_LOGOUT:
3880                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881                 if (!cmd)
3882                         goto reject;
3883
3884                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3885                 if (ret > 0)
3886                         wait_for_completion_timeout(&conn->conn_logout_comp,
3887                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3888                 break;
3889         case ISCSI_OP_SNACK:
3890                 ret = iscsit_handle_snack(conn, buf);
3891                 break;
3892         default:
3893                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3894                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3895                         pr_err("Cannot recover from unknown"
3896                         " opcode while ERL=0, closing iSCSI connection.\n");
3897                         return -1;
3898                 }
3899                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3900                        " closing iSCSI connection.\n");
3901                 ret = -1;
3902                 break;
3903         }
3904
3905         return ret;
3906 reject:
3907         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3908 }
3909
3910 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3911 {
3912         bool ret;
3913
3914         spin_lock_bh(&conn->state_lock);
3915         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3916         spin_unlock_bh(&conn->state_lock);
3917
3918         return ret;
3919 }
3920
3921 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3922 {
3923         int ret;
3924         u8 buffer[ISCSI_HDR_LEN], opcode;
3925         u32 checksum = 0, digest = 0;
3926         struct kvec iov;
3927
3928         while (!kthread_should_stop()) {
3929                 /*
3930                  * Ensure that both TX and RX per connection kthreads
3931                  * are scheduled to run on the same CPU.
3932                  */
3933                 iscsit_thread_check_cpumask(conn, current, 0);
3934
3935                 memset(buffer, 0, ISCSI_HDR_LEN);
3936                 memset(&iov, 0, sizeof(struct kvec));
3937
3938                 iov.iov_base    = buffer;
3939                 iov.iov_len     = ISCSI_HDR_LEN;
3940
3941                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3942                 if (ret != ISCSI_HDR_LEN) {
3943                         iscsit_rx_thread_wait_for_tcp(conn);
3944                         return;
3945                 }
3946
3947                 if (conn->conn_ops->HeaderDigest) {
3948                         iov.iov_base    = &digest;
3949                         iov.iov_len     = ISCSI_CRC_LEN;
3950
3951                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3952                         if (ret != ISCSI_CRC_LEN) {
3953                                 iscsit_rx_thread_wait_for_tcp(conn);
3954                                 return;
3955                         }
3956
3957                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3958                                         buffer, ISCSI_HDR_LEN,
3959                                         0, NULL, (u8 *)&checksum);
3960
3961                         if (digest != checksum) {
3962                                 pr_err("HeaderDigest CRC32C failed,"
3963                                         " received 0x%08x, computed 0x%08x\n",
3964                                         digest, checksum);
3965                                 /*
3966                                  * Set the PDU to 0xff so it will intentionally
3967                                  * hit default in the switch below.
3968                                  */
3969                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3970                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3971                         } else {
3972                                 pr_debug("Got HeaderDigest CRC32C"
3973                                                 " 0x%08x\n", checksum);
3974                         }
3975                 }
3976
3977                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3978                         return;
3979
3980                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3981
3982                 if (conn->sess->sess_ops->SessionType &&
3983                    ((!(opcode & ISCSI_OP_TEXT)) ||
3984                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3985                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3986                         " while in Discovery Session, rejecting.\n", opcode);
3987                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3988                                           buffer);
3989                         return;
3990                 }
3991
3992                 ret = iscsi_target_rx_opcode(conn, buffer);
3993                 if (ret < 0)
3994                         return;
3995         }
3996 }
3997
3998 int iscsi_target_rx_thread(void *arg)
3999 {
4000         int rc;
4001         struct iscsi_conn *conn = arg;
4002
4003         /*
4004          * Allow ourselves to be interrupted by SIGINT so that a
4005          * connection recovery / failure event can be triggered externally.
4006          */
4007         allow_signal(SIGINT);
4008         /*
4009          * Wait for iscsi_post_login_handler() to complete before allowing
4010          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4011          */
4012         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4013         if (rc < 0 || iscsi_target_check_conn_state(conn))
4014                 return 0;
4015
4016         if (!conn->conn_transport->iscsit_get_rx_pdu)
4017                 return 0;
4018
4019         conn->conn_transport->iscsit_get_rx_pdu(conn);
4020
4021         if (!signal_pending(current))
4022                 atomic_set(&conn->transport_failed, 1);
4023         iscsit_take_action_for_connection_exit(conn);
4024         return 0;
4025 }
4026
4027 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4028 {
4029         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4030         struct iscsi_session *sess = conn->sess;
4031         /*
4032          * We expect this function to only ever be called from either RX or TX
4033          * thread context via iscsit_close_connection() once the other context
4034          * has been reset -> returned sleeping pre-handler state.
4035          */
4036         spin_lock_bh(&conn->cmd_lock);
4037         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4038
4039                 list_del_init(&cmd->i_conn_node);
4040                 spin_unlock_bh(&conn->cmd_lock);
4041
4042                 iscsit_increment_maxcmdsn(cmd, sess);
4043
4044                 iscsit_free_cmd(cmd, true);
4045
4046                 spin_lock_bh(&conn->cmd_lock);
4047         }
4048         spin_unlock_bh(&conn->cmd_lock);
4049 }
4050
4051 static void iscsit_stop_timers_for_cmds(
4052         struct iscsi_conn *conn)
4053 {
4054         struct iscsi_cmd *cmd;
4055
4056         spin_lock_bh(&conn->cmd_lock);
4057         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4058                 if (cmd->data_direction == DMA_TO_DEVICE)
4059                         iscsit_stop_dataout_timer(cmd);
4060         }
4061         spin_unlock_bh(&conn->cmd_lock);
4062 }
4063
4064 int iscsit_close_connection(
4065         struct iscsi_conn *conn)
4066 {
4067         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4068         struct iscsi_session    *sess = conn->sess;
4069
4070         pr_debug("Closing iSCSI connection CID %hu on SID:"
4071                 " %u\n", conn->cid, sess->sid);
4072         /*
4073          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4074          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4075          * sleeping and the logout response never got sent because the
4076          * connection failed.
4077          *
4078          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4079          * to signal logout response TX interrupt completion.  Go ahead and skip
4080          * this for iser since isert_rx_opcode() does not wait on logout failure,
4081          * and to avoid iscsi_conn pointer dereference in iser-target code.
4082          */
4083         if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4084             (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4085                 complete(&conn->conn_logout_comp);
4086
4087         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4088                 if (conn->tx_thread &&
4089                     cmpxchg(&conn->tx_thread_active, true, false)) {
4090                         send_sig(SIGINT, conn->tx_thread, 1);
4091                         kthread_stop(conn->tx_thread);
4092                 }
4093         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4094                 if (conn->rx_thread &&
4095                     cmpxchg(&conn->rx_thread_active, true, false)) {
4096                         send_sig(SIGINT, conn->rx_thread, 1);
4097                         kthread_stop(conn->rx_thread);
4098                 }
4099         }
4100
4101         spin_lock(&iscsit_global->ts_bitmap_lock);
4102         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4103                               get_order(1));
4104         spin_unlock(&iscsit_global->ts_bitmap_lock);
4105
4106         iscsit_stop_timers_for_cmds(conn);
4107         iscsit_stop_nopin_response_timer(conn);
4108         iscsit_stop_nopin_timer(conn);
4109
4110         if (conn->conn_transport->iscsit_wait_conn)
4111                 conn->conn_transport->iscsit_wait_conn(conn);
4112
4113         /*
4114          * During Connection recovery drop unacknowledged out of order
4115          * commands for this connection, and prepare the other commands
4116          * for realligence.
4117          *
4118          * During normal operation clear the out of order commands (but
4119          * do not free the struct iscsi_ooo_cmdsn's) and release all
4120          * struct iscsi_cmds.
4121          */
4122         if (atomic_read(&conn->connection_recovery)) {
4123                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4124                 iscsit_prepare_cmds_for_realligance(conn);
4125         } else {
4126                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4127                 iscsit_release_commands_from_conn(conn);
4128         }
4129         iscsit_free_queue_reqs_for_conn(conn);
4130
4131         /*
4132          * Handle decrementing session or connection usage count if
4133          * a logout response was not able to be sent because the
4134          * connection failed.  Fall back to Session Recovery here.
4135          */
4136         if (atomic_read(&conn->conn_logout_remove)) {
4137                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4138                         iscsit_dec_conn_usage_count(conn);
4139                         iscsit_dec_session_usage_count(sess);
4140                 }
4141                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4142                         iscsit_dec_conn_usage_count(conn);
4143
4144                 atomic_set(&conn->conn_logout_remove, 0);
4145                 atomic_set(&sess->session_reinstatement, 0);
4146                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4147         }
4148
4149         spin_lock_bh(&sess->conn_lock);
4150         list_del(&conn->conn_list);
4151
4152         /*
4153          * Attempt to let the Initiator know this connection failed by
4154          * sending an Connection Dropped Async Message on another
4155          * active connection.
4156          */
4157         if (atomic_read(&conn->connection_recovery))
4158                 iscsit_build_conn_drop_async_message(conn);
4159
4160         spin_unlock_bh(&sess->conn_lock);
4161
4162         /*
4163          * If connection reinstatement is being performed on this connection,
4164          * up the connection reinstatement semaphore that is being blocked on
4165          * in iscsit_cause_connection_reinstatement().
4166          */
4167         spin_lock_bh(&conn->state_lock);
4168         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4169                 spin_unlock_bh(&conn->state_lock);
4170                 complete(&conn->conn_wait_comp);
4171                 wait_for_completion(&conn->conn_post_wait_comp);
4172                 spin_lock_bh(&conn->state_lock);
4173         }
4174
4175         /*
4176          * If connection reinstatement is being performed on this connection
4177          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4178          * connection wait rcfr semaphore that is being blocked on
4179          * an iscsit_connection_reinstatement_rcfr().
4180          */
4181         if (atomic_read(&conn->connection_wait_rcfr)) {
4182                 spin_unlock_bh(&conn->state_lock);
4183                 complete(&conn->conn_wait_rcfr_comp);
4184                 wait_for_completion(&conn->conn_post_wait_comp);
4185                 spin_lock_bh(&conn->state_lock);
4186         }
4187         atomic_set(&conn->connection_reinstatement, 1);
4188         spin_unlock_bh(&conn->state_lock);
4189
4190         /*
4191          * If any other processes are accessing this connection pointer we
4192          * must wait until they have completed.
4193          */
4194         iscsit_check_conn_usage_count(conn);
4195
4196         ahash_request_free(conn->conn_tx_hash);
4197         if (conn->conn_rx_hash) {
4198                 struct crypto_ahash *tfm;
4199
4200                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4201                 ahash_request_free(conn->conn_rx_hash);
4202                 crypto_free_ahash(tfm);
4203         }
4204
4205         free_cpumask_var(conn->conn_cpumask);
4206
4207         kfree(conn->conn_ops);
4208         conn->conn_ops = NULL;
4209
4210         if (conn->sock)
4211                 sock_release(conn->sock);
4212
4213         if (conn->conn_transport->iscsit_free_conn)
4214                 conn->conn_transport->iscsit_free_conn(conn);
4215
4216         iscsit_put_transport(conn->conn_transport);
4217
4218         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4219         conn->conn_state = TARG_CONN_STATE_FREE;
4220         kfree(conn);
4221
4222         spin_lock_bh(&sess->conn_lock);
4223         atomic_dec(&sess->nconn);
4224         pr_debug("Decremented iSCSI connection count to %hu from node:"
4225                 " %s\n", atomic_read(&sess->nconn),
4226                 sess->sess_ops->InitiatorName);
4227         /*
4228          * Make sure that if one connection fails in an non ERL=2 iSCSI
4229          * Session that they all fail.
4230          */
4231         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4232              !atomic_read(&sess->session_logout))
4233                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4234
4235         /*
4236          * If this was not the last connection in the session, and we are
4237          * performing session reinstatement or falling back to ERL=0, call
4238          * iscsit_stop_session() without sleeping to shutdown the other
4239          * active connections.
4240          */
4241         if (atomic_read(&sess->nconn)) {
4242                 if (!atomic_read(&sess->session_reinstatement) &&
4243                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4244                         spin_unlock_bh(&sess->conn_lock);
4245                         return 0;
4246                 }
4247                 if (!atomic_read(&sess->session_stop_active)) {
4248                         atomic_set(&sess->session_stop_active, 1);
4249                         spin_unlock_bh(&sess->conn_lock);
4250                         iscsit_stop_session(sess, 0, 0);
4251                         return 0;
4252                 }
4253                 spin_unlock_bh(&sess->conn_lock);
4254                 return 0;
4255         }
4256
4257         /*
4258          * If this was the last connection in the session and one of the
4259          * following is occurring:
4260          *
4261          * Session Reinstatement is not being performed, and are falling back
4262          * to ERL=0 call iscsit_close_session().
4263          *
4264          * Session Logout was requested.  iscsit_close_session() will be called
4265          * elsewhere.
4266          *
4267          * Session Continuation is not being performed, start the Time2Retain
4268          * handler and check if sleep_on_sess_wait_sem is active.
4269          */
4270         if (!atomic_read(&sess->session_reinstatement) &&
4271              atomic_read(&sess->session_fall_back_to_erl0)) {
4272                 spin_unlock_bh(&sess->conn_lock);
4273                 iscsit_close_session(sess);
4274
4275                 return 0;
4276         } else if (atomic_read(&sess->session_logout)) {
4277                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4278                 sess->session_state = TARG_SESS_STATE_FREE;
4279                 spin_unlock_bh(&sess->conn_lock);
4280
4281                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4282                         complete(&sess->session_wait_comp);
4283
4284                 return 0;
4285         } else {
4286                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4287                 sess->session_state = TARG_SESS_STATE_FAILED;
4288
4289                 if (!atomic_read(&sess->session_continuation)) {
4290                         spin_unlock_bh(&sess->conn_lock);
4291                         iscsit_start_time2retain_handler(sess);
4292                 } else
4293                         spin_unlock_bh(&sess->conn_lock);
4294
4295                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4296                         complete(&sess->session_wait_comp);
4297
4298                 return 0;
4299         }
4300 }
4301
4302 /*
4303  * If the iSCSI Session for the iSCSI Initiator Node exists,
4304  * forcefully shutdown the iSCSI NEXUS.
4305  */
4306 int iscsit_close_session(struct iscsi_session *sess)
4307 {
4308         struct iscsi_portal_group *tpg = sess->tpg;
4309         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4310
4311         if (atomic_read(&sess->nconn)) {
4312                 pr_err("%d connection(s) still exist for iSCSI session"
4313                         " to %s\n", atomic_read(&sess->nconn),
4314                         sess->sess_ops->InitiatorName);
4315                 BUG();
4316         }
4317
4318         spin_lock_bh(&se_tpg->session_lock);
4319         atomic_set(&sess->session_logout, 1);
4320         atomic_set(&sess->session_reinstatement, 1);
4321         iscsit_stop_time2retain_timer(sess);
4322         spin_unlock_bh(&se_tpg->session_lock);
4323
4324         /*
4325          * transport_deregister_session_configfs() will clear the
4326          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4327          * can be setting it again with __transport_register_session() in
4328          * iscsi_post_login_handler() again after the iscsit_stop_session()
4329          * completes in iscsi_np context.
4330          */
4331         transport_deregister_session_configfs(sess->se_sess);
4332
4333         /*
4334          * If any other processes are accessing this session pointer we must
4335          * wait until they have completed.  If we are in an interrupt (the
4336          * time2retain handler) and contain and active session usage count we
4337          * restart the timer and exit.
4338          */
4339         if (!in_interrupt()) {
4340                 if (iscsit_check_session_usage_count(sess) == 1)
4341                         iscsit_stop_session(sess, 1, 1);
4342         } else {
4343                 if (iscsit_check_session_usage_count(sess) == 2) {
4344                         atomic_set(&sess->session_logout, 0);
4345                         iscsit_start_time2retain_handler(sess);
4346                         return 0;
4347                 }
4348         }
4349
4350         transport_deregister_session(sess->se_sess);
4351
4352         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4353                 iscsit_free_connection_recovery_entires(sess);
4354
4355         iscsit_free_all_ooo_cmdsns(sess);
4356
4357         spin_lock_bh(&se_tpg->session_lock);
4358         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4359         sess->session_state = TARG_SESS_STATE_FREE;
4360         pr_debug("Released iSCSI session from node: %s\n",
4361                         sess->sess_ops->InitiatorName);
4362         tpg->nsessions--;
4363         if (tpg->tpg_tiqn)
4364                 tpg->tpg_tiqn->tiqn_nsessions--;
4365
4366         pr_debug("Decremented number of active iSCSI Sessions on"
4367                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4368
4369         spin_lock(&sess_idr_lock);
4370         idr_remove(&sess_idr, sess->session_index);
4371         spin_unlock(&sess_idr_lock);
4372
4373         kfree(sess->sess_ops);
4374         sess->sess_ops = NULL;
4375         spin_unlock_bh(&se_tpg->session_lock);
4376
4377         kfree(sess);
4378         return 0;
4379 }
4380
4381 static void iscsit_logout_post_handler_closesession(
4382         struct iscsi_conn *conn)
4383 {
4384         struct iscsi_session *sess = conn->sess;
4385         int sleep = 1;
4386         /*
4387          * Traditional iscsi/tcp will invoke this logic from TX thread
4388          * context during session logout, so clear tx_thread_active and
4389          * sleep if iscsit_close_connection() has not already occured.
4390          *
4391          * Since iser-target invokes this logic from it's own workqueue,
4392          * always sleep waiting for RX/TX thread shutdown to complete
4393          * within iscsit_close_connection().
4394          */
4395         if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4396             (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4397                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4398
4399         atomic_set(&conn->conn_logout_remove, 0);
4400         complete(&conn->conn_logout_comp);
4401
4402         iscsit_dec_conn_usage_count(conn);
4403         iscsit_stop_session(sess, sleep, sleep);
4404         iscsit_dec_session_usage_count(sess);
4405         iscsit_close_session(sess);
4406 }
4407
4408 static void iscsit_logout_post_handler_samecid(
4409         struct iscsi_conn *conn)
4410 {
4411         int sleep = 1;
4412
4413         if ((conn->conn_transport->transport_type == ISCSI_TCP) ||
4414             (conn->conn_transport->transport_type == ISCSI_HW_OFFLOAD))
4415                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4416
4417         atomic_set(&conn->conn_logout_remove, 0);
4418         complete(&conn->conn_logout_comp);
4419
4420         iscsit_cause_connection_reinstatement(conn, sleep);
4421         iscsit_dec_conn_usage_count(conn);
4422 }
4423
4424 static void iscsit_logout_post_handler_diffcid(
4425         struct iscsi_conn *conn,
4426         u16 cid)
4427 {
4428         struct iscsi_conn *l_conn;
4429         struct iscsi_session *sess = conn->sess;
4430         bool conn_found = false;
4431
4432         if (!sess)
4433                 return;
4434
4435         spin_lock_bh(&sess->conn_lock);
4436         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4437                 if (l_conn->cid == cid) {
4438                         iscsit_inc_conn_usage_count(l_conn);
4439                         conn_found = true;
4440                         break;
4441                 }
4442         }
4443         spin_unlock_bh(&sess->conn_lock);
4444
4445         if (!conn_found)
4446                 return;
4447
4448         if (l_conn->sock)
4449                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4450
4451         spin_lock_bh(&l_conn->state_lock);
4452         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4453         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4454         spin_unlock_bh(&l_conn->state_lock);
4455
4456         iscsit_cause_connection_reinstatement(l_conn, 1);
4457         iscsit_dec_conn_usage_count(l_conn);
4458 }
4459
4460 /*
4461  *      Return of 0 causes the TX thread to restart.
4462  */
4463 int iscsit_logout_post_handler(
4464         struct iscsi_cmd *cmd,
4465         struct iscsi_conn *conn)
4466 {
4467         int ret = 0;
4468
4469         switch (cmd->logout_reason) {
4470         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4471                 switch (cmd->logout_response) {
4472                 case ISCSI_LOGOUT_SUCCESS:
4473                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4474                 default:
4475                         iscsit_logout_post_handler_closesession(conn);
4476                         break;
4477                 }
4478                 ret = 0;
4479                 break;
4480         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4481                 if (conn->cid == cmd->logout_cid) {
4482                         switch (cmd->logout_response) {
4483                         case ISCSI_LOGOUT_SUCCESS:
4484                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4485                         default:
4486                                 iscsit_logout_post_handler_samecid(conn);
4487                                 break;
4488                         }
4489                         ret = 0;
4490                 } else {
4491                         switch (cmd->logout_response) {
4492                         case ISCSI_LOGOUT_SUCCESS:
4493                                 iscsit_logout_post_handler_diffcid(conn,
4494                                         cmd->logout_cid);
4495                                 break;
4496                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4497                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4498                         default:
4499                                 break;
4500                         }
4501                         ret = 1;
4502                 }
4503                 break;
4504         case ISCSI_LOGOUT_REASON_RECOVERY:
4505                 switch (cmd->logout_response) {
4506                 case ISCSI_LOGOUT_SUCCESS:
4507                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4508                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4509                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4510                 default:
4511                         break;
4512                 }
4513                 ret = 1;
4514                 break;
4515         default:
4516                 break;
4517
4518         }
4519         return ret;
4520 }
4521 EXPORT_SYMBOL(iscsit_logout_post_handler);
4522
4523 void iscsit_fail_session(struct iscsi_session *sess)
4524 {
4525         struct iscsi_conn *conn;
4526
4527         spin_lock_bh(&sess->conn_lock);
4528         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4529                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4530                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4531         }
4532         spin_unlock_bh(&sess->conn_lock);
4533
4534         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4535         sess->session_state = TARG_SESS_STATE_FAILED;
4536 }
4537
4538 int iscsit_free_session(struct iscsi_session *sess)
4539 {
4540         u16 conn_count = atomic_read(&sess->nconn);
4541         struct iscsi_conn *conn, *conn_tmp = NULL;
4542         int is_last;
4543
4544         spin_lock_bh(&sess->conn_lock);
4545         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4546
4547         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4548                         conn_list) {
4549                 if (conn_count == 0)
4550                         break;
4551
4552                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4553                         is_last = 1;
4554                 } else {
4555                         iscsit_inc_conn_usage_count(conn_tmp);
4556                         is_last = 0;
4557                 }
4558                 iscsit_inc_conn_usage_count(conn);
4559
4560                 spin_unlock_bh(&sess->conn_lock);
4561                 iscsit_cause_connection_reinstatement(conn, 1);
4562                 spin_lock_bh(&sess->conn_lock);
4563
4564                 iscsit_dec_conn_usage_count(conn);
4565                 if (is_last == 0)
4566                         iscsit_dec_conn_usage_count(conn_tmp);
4567
4568                 conn_count--;
4569         }
4570
4571         if (atomic_read(&sess->nconn)) {
4572                 spin_unlock_bh(&sess->conn_lock);
4573                 wait_for_completion(&sess->session_wait_comp);
4574         } else
4575                 spin_unlock_bh(&sess->conn_lock);
4576
4577         iscsit_close_session(sess);
4578         return 0;
4579 }
4580
4581 void iscsit_stop_session(
4582         struct iscsi_session *sess,
4583         int session_sleep,
4584         int connection_sleep)
4585 {
4586         u16 conn_count = atomic_read(&sess->nconn);
4587         struct iscsi_conn *conn, *conn_tmp = NULL;
4588         int is_last;
4589
4590         spin_lock_bh(&sess->conn_lock);
4591         if (session_sleep)
4592                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4593
4594         if (connection_sleep) {
4595                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4596                                 conn_list) {
4597                         if (conn_count == 0)
4598                                 break;
4599
4600                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4601                                 is_last = 1;
4602                         } else {
4603                                 iscsit_inc_conn_usage_count(conn_tmp);
4604                                 is_last = 0;
4605                         }
4606                         iscsit_inc_conn_usage_count(conn);
4607
4608                         spin_unlock_bh(&sess->conn_lock);
4609                         iscsit_cause_connection_reinstatement(conn, 1);
4610                         spin_lock_bh(&sess->conn_lock);
4611
4612                         iscsit_dec_conn_usage_count(conn);
4613                         if (is_last == 0)
4614                                 iscsit_dec_conn_usage_count(conn_tmp);
4615                         conn_count--;
4616                 }
4617         } else {
4618                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4619                         iscsit_cause_connection_reinstatement(conn, 0);
4620         }
4621
4622         if (session_sleep && atomic_read(&sess->nconn)) {
4623                 spin_unlock_bh(&sess->conn_lock);
4624                 wait_for_completion(&sess->session_wait_comp);
4625         } else
4626                 spin_unlock_bh(&sess->conn_lock);
4627 }
4628
4629 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4630 {
4631         struct iscsi_session *sess;
4632         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4633         struct se_session *se_sess, *se_sess_tmp;
4634         LIST_HEAD(free_list);
4635         int session_count = 0;
4636
4637         spin_lock_bh(&se_tpg->session_lock);
4638         if (tpg->nsessions && !force) {
4639                 spin_unlock_bh(&se_tpg->session_lock);
4640                 return -1;
4641         }
4642
4643         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4644                         sess_list) {
4645                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4646
4647                 spin_lock(&sess->conn_lock);
4648                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4649                     atomic_read(&sess->session_logout) ||
4650                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4651                         spin_unlock(&sess->conn_lock);
4652                         continue;
4653                 }
4654                 atomic_set(&sess->session_reinstatement, 1);
4655                 spin_unlock(&sess->conn_lock);
4656
4657                 list_move_tail(&se_sess->sess_list, &free_list);
4658         }
4659         spin_unlock_bh(&se_tpg->session_lock);
4660
4661         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4662                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4663
4664                 iscsit_free_session(sess);
4665                 session_count++;
4666         }
4667
4668         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4669                         " Group: %hu\n", session_count, tpg->tpgt);
4670         return 0;
4671 }
4672
4673 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4674 MODULE_VERSION("4.1.x");
4675 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4676 MODULE_LICENSE("GPL");
4677
4678 module_init(iscsi_target_init_module);
4679 module_exit(iscsi_target_cleanup_module);