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         .rdma_shutdown          = false,
 674         .owner                  = NULL,
 675         .iscsit_setup_np        = iscsit_setup_np,
 676         .iscsit_accept_np       = iscsit_accept_np,
 677         .iscsit_free_np         = iscsit_free_np,
 678         .iscsit_get_login_rx    = iscsit_get_login_rx,
 679         .iscsit_put_login_tx    = iscsit_put_login_tx,
 680         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 681         .iscsit_immediate_queue = iscsit_immediate_queue,
 682         .iscsit_response_queue  = iscsit_response_queue,
 683         .iscsit_queue_data_in   = iscsit_queue_rsp,
 684         .iscsit_queue_status    = iscsit_queue_rsp,
 685         .iscsit_aborted_task    = iscsit_aborted_task,
 686         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 687         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 688         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 689 };
 690
 691 static int __init iscsi_target_init_module(void)
 692 {
 693         int ret = 0, size;
 694
 695         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 696
 697         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 698         if (!iscsit_global) {
 699                 pr_err("Unable to allocate memory for iscsit_global\n");
 700                 return -1;
 701         }
 702         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 703         mutex_init(&auth_id_lock);
 704         spin_lock_init(&sess_idr_lock);
 705         idr_init(&tiqn_idr);
 706         idr_init(&sess_idr);
 707
 708         ret = target_register_template(&iscsi_ops);
 709         if (ret)
 710                 goto out;
 711
 712         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 713         iscsit_global->ts_bitmap = vzalloc(size);
 714         if (!iscsit_global->ts_bitmap) {
 715                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 716                 goto configfs_out;
 717         }
 718
 719         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 720                         sizeof(struct iscsi_queue_req),
 721                         __alignof__(struct iscsi_queue_req), 0, NULL);
 722         if (!lio_qr_cache) {
 723                 pr_err("nable to kmem_cache_create() for"
 724                                 " lio_qr_cache\n");
 725                 goto bitmap_out;
 726         }
 727
 728         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 729                         sizeof(struct iscsi_datain_req),
 730                         __alignof__(struct iscsi_datain_req), 0, NULL);
 731         if (!lio_dr_cache) {
 732                 pr_err("Unable to kmem_cache_create() for"
 733                                 " lio_dr_cache\n");
 734                 goto qr_out;
 735         }
 736
 737         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 738                         sizeof(struct iscsi_ooo_cmdsn),
 739                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 740         if (!lio_ooo_cache) {
 741                 pr_err("Unable to kmem_cache_create() for"
 742                                 " lio_ooo_cache\n");
 743                 goto dr_out;
 744         }
 745
 746         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 747                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 748                         0, NULL);
 749         if (!lio_r2t_cache) {
 750                 pr_err("Unable to kmem_cache_create() for"
 751                                 " lio_r2t_cache\n");
 752                 goto ooo_out;
 753         }
 754
 755         iscsit_register_transport(&iscsi_target_transport);
 756
 757         if (iscsit_load_discovery_tpg() < 0)
 758                 goto r2t_out;
 759
 760         return ret;
 761 r2t_out:
 762         iscsit_unregister_transport(&iscsi_target_transport);
 763         kmem_cache_destroy(lio_r2t_cache);
 764 ooo_out:
 765         kmem_cache_destroy(lio_ooo_cache);
 766 dr_out:
 767         kmem_cache_destroy(lio_dr_cache);
 768 qr_out:
 769         kmem_cache_destroy(lio_qr_cache);
 770 bitmap_out:
 771         vfree(iscsit_global->ts_bitmap);
 772 configfs_out:
 773         /* XXX: this probably wants it to be it's own unwind step.. */
 774         if (iscsit_global->discovery_tpg)
 775                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 776         target_unregister_template(&iscsi_ops);
 777 out:
 778         kfree(iscsit_global);
 779         return -ENOMEM;
 780 }
 781
 782 static void __exit iscsi_target_cleanup_module(void)
 783 {
 784         iscsit_release_discovery_tpg();
 785         iscsit_unregister_transport(&iscsi_target_transport);
 786         kmem_cache_destroy(lio_qr_cache);
 787         kmem_cache_destroy(lio_dr_cache);
 788         kmem_cache_destroy(lio_ooo_cache);
 789         kmem_cache_destroy(lio_r2t_cache);
 790
 791         /*
 792          * Shutdown discovery sessions and disable discovery TPG
 793          */
 794         if (iscsit_global->discovery_tpg)
 795                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 796
 797         target_unregister_template(&iscsi_ops);
 798
 799         vfree(iscsit_global->ts_bitmap);
 800         kfree(iscsit_global);
 801 }
 802
 803 int iscsit_add_reject(
 804         struct iscsi_conn *conn,
 805         u8 reason,
 806         unsigned char *buf)
 807 {
 808         struct iscsi_cmd *cmd;
 809
 810         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 811         if (!cmd)
 812                 return -1;
 813
 814         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 815         cmd->reject_reason = reason;
 816
 817         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 818         if (!cmd->buf_ptr) {
 819                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 820                 iscsit_free_cmd(cmd, false);
 821                 return -1;
 822         }
 823
 824         spin_lock_bh(&conn->cmd_lock);
 825         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 826         spin_unlock_bh(&conn->cmd_lock);
 827
 828         cmd->i_state = ISTATE_SEND_REJECT;
 829         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 830
 831         return -1;
 832 }
 833 EXPORT_SYMBOL(iscsit_add_reject);
 834
 835 static int iscsit_add_reject_from_cmd(
 836         struct iscsi_cmd *cmd,
 837         u8 reason,
 838         bool add_to_conn,
 839         unsigned char *buf)
 840 {
 841         struct iscsi_conn *conn;
 842
 843         if (!cmd->conn) {
 844                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 845                                 cmd->init_task_tag);
 846                 return -1;
 847         }
 848         conn = cmd->conn;
 849
 850         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 851         cmd->reject_reason = reason;
 852
 853         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 854         if (!cmd->buf_ptr) {
 855                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 856                 iscsit_free_cmd(cmd, false);
 857                 return -1;
 858         }
 859
 860         if (add_to_conn) {
 861                 spin_lock_bh(&conn->cmd_lock);
 862                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 863                 spin_unlock_bh(&conn->cmd_lock);
 864         }
 865
 866         cmd->i_state = ISTATE_SEND_REJECT;
 867         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 868         /*
 869          * Perform the kref_put now if se_cmd has already been setup by
 870          * scsit_setup_scsi_cmd()
 871          */
 872         if (cmd->se_cmd.se_tfo != NULL) {
 873                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 874                 target_put_sess_cmd(&cmd->se_cmd);
 875         }
 876         return -1;
 877 }
 878
 879 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 880                                  unsigned char *buf)
 881 {
 882         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 883 }
 884
 885 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 886 {
 887         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 888 }
 889 EXPORT_SYMBOL(iscsit_reject_cmd);
 890
 891 /*
 892  * Map some portion of the allocated scatterlist to an iovec, suitable for
 893  * kernel sockets to copy data in/out.
 894  */
 895 static int iscsit_map_iovec(
 896         struct iscsi_cmd *cmd,
 897         struct kvec *iov,
 898         u32 data_offset,
 899         u32 data_length)
 900 {
 901         u32 i = 0;
 902         struct scatterlist *sg;
 903         unsigned int page_off;
 904
 905         /*
 906          * We know each entry in t_data_sg contains a page.
 907          */
 908         u32 ent = data_offset / PAGE_SIZE;
 909
 910         if (ent >= cmd->se_cmd.t_data_nents) {
 911                 pr_err("Initial page entry out-of-bounds\n");
 912                 return -1;
 913         }
 914
 915         sg = &cmd->se_cmd.t_data_sg[ent];
 916         page_off = (data_offset % PAGE_SIZE);
 917
 918         cmd->first_data_sg = sg;
 919         cmd->first_data_sg_off = page_off;
 920
 921         while (data_length) {
 922                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 923
 924                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 925                 iov[i].iov_len = cur_len;
 926
 927                 data_length -= cur_len;
 928                 page_off = 0;
 929                 sg = sg_next(sg);
 930                 i++;
 931         }
 932
 933         cmd->kmapped_nents = i;
 934
 935         return i;
 936 }
 937
 938 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 939 {
 940         u32 i;
 941         struct scatterlist *sg;
 942
 943         sg = cmd->first_data_sg;
 944
 945         for (i = 0; i < cmd->kmapped_nents; i++)
 946                 kunmap(sg_page(&sg[i]));
 947 }
 948
 949 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 950 {
 951         LIST_HEAD(ack_list);
 952         struct iscsi_cmd *cmd, *cmd_p;
 953
 954         conn->exp_statsn = exp_statsn;
 955
 956         if (conn->sess->sess_ops->RDMAExtensions)
 957                 return;
 958
 959         spin_lock_bh(&conn->cmd_lock);
 960         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 961                 spin_lock(&cmd->istate_lock);
 962                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 963                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 964                         cmd->i_state = ISTATE_REMOVE;
 965                         spin_unlock(&cmd->istate_lock);
 966                         list_move_tail(&cmd->i_conn_node, &ack_list);
 967                         continue;
 968                 }
 969                 spin_unlock(&cmd->istate_lock);
 970         }
 971         spin_unlock_bh(&conn->cmd_lock);
 972
 973         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 974                 list_del_init(&cmd->i_conn_node);
 975                 iscsit_free_cmd(cmd, false);
 976         }
 977 }
 978
 979 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 980 {
 981         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 982
 983         iov_count += ISCSI_IOV_DATA_BUFFER;
 984
 985         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 986         if (!cmd->iov_data) {
 987                 pr_err("Unable to allocate cmd->iov_data\n");
 988                 return -ENOMEM;
 989         }
 990
 991         cmd->orig_iov_data_count = iov_count;
 992         return 0;
 993 }
 994
 995 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 996                           unsigned char *buf)
 997 {
 998         int data_direction, payload_length;
 999         struct iscsi_scsi_req *hdr;
1000         int iscsi_task_attr;
1001         int sam_task_attr;
1002
1003         atomic_long_inc(&conn->sess->cmd_pdus);
1004
1005         hdr                     = (struct iscsi_scsi_req *) buf;
1006         payload_length          = ntoh24(hdr->dlength);
1007
1008         /* FIXME; Add checks for AdditionalHeaderSegment */
1009
1010         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1011             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1012                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1013                                 " not set. Bad iSCSI Initiator.\n");
1014                 return iscsit_add_reject_cmd(cmd,
1015                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1016         }
1017
1018         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1019              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1020                 /*
1021                  * From RFC-3720 Section 10.3.1:
1022                  *
1023                  * "Either or both of R and W MAY be 1 when either the
1024                  *  Expected Data Transfer Length and/or Bidirectional Read
1025                  *  Expected Data Transfer Length are 0"
1026                  *
1027                  * For this case, go ahead and clear the unnecssary bits
1028                  * to avoid any confusion with ->data_direction.
1029                  */
1030                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1031                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1032
1033                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1034                         " set when Expected Data Transfer Length is 0 for"
1035                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1036         }
1037
1038         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1040                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1041                         " MUST be set if Expected Data Transfer Length is not 0."
1042                         " Bad iSCSI Initiator\n");
1043                 return iscsit_add_reject_cmd(cmd,
1044                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1045         }
1046
1047         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1048             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1049                 pr_err("Bidirectional operations not supported!\n");
1050                 return iscsit_add_reject_cmd(cmd,
1051                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1052         }
1053
1054         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1055                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1056                                 " Scsi Command PDU.\n");
1057                 return iscsit_add_reject_cmd(cmd,
1058                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1059         }
1060
1061         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1062                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1063                         " protocol error.\n", payload_length);
1064                 return iscsit_add_reject_cmd(cmd,
1065                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1066         }
1067
1068         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1069             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1070                 pr_err("Expected Data Transfer Length and Length of"
1071                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1072                         " bit is not set protocol error\n");
1073                 return iscsit_add_reject_cmd(cmd,
1074                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1075         }
1076
1077         if (payload_length > be32_to_cpu(hdr->data_length)) {
1078                 pr_err("DataSegmentLength: %u is greater than"
1079                         " EDTL: %u, protocol error.\n", payload_length,
1080                                 hdr->data_length);
1081                 return iscsit_add_reject_cmd(cmd,
1082                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1083         }
1084
1085         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1086                 pr_err("DataSegmentLength: %u is greater than"
1087                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1088                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1089                 return iscsit_add_reject_cmd(cmd,
1090                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1091         }
1092
1093         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1094                 pr_err("DataSegmentLength: %u is greater than"
1095                         " FirstBurstLength: %u, protocol error.\n",
1096                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1097                 return iscsit_add_reject_cmd(cmd,
1098                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1099         }
1100
1101         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1102                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1103                           DMA_NONE;
1104
1105         cmd->data_direction = data_direction;
1106         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1107         /*
1108          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1109          */
1110         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1111             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1112                 sam_task_attr = TCM_SIMPLE_TAG;
1113         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1114                 sam_task_attr = TCM_ORDERED_TAG;
1115         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1116                 sam_task_attr = TCM_HEAD_TAG;
1117         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1118                 sam_task_attr = TCM_ACA_TAG;
1119         else {
1120                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1121                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1122                 sam_task_attr = TCM_SIMPLE_TAG;
1123         }
1124
1125         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1126         cmd->i_state            = ISTATE_NEW_CMD;
1127         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1128         cmd->immediate_data     = (payload_length) ? 1 : 0;
1129         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1130                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1131         if (cmd->unsolicited_data)
1132                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1133
1134         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1135         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1136                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1137         else
1138                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1139         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1140         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1141         cmd->first_burst_len    = payload_length;
1142
1143         if (!conn->sess->sess_ops->RDMAExtensions &&
1144              cmd->data_direction == DMA_FROM_DEVICE) {
1145                 struct iscsi_datain_req *dr;
1146
1147                 dr = iscsit_allocate_datain_req();
1148                 if (!dr)
1149                         return iscsit_add_reject_cmd(cmd,
1150                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1151
1152                 iscsit_attach_datain_req(cmd, dr);
1153         }
1154
1155         /*
1156          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1157          */
1158         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1159                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1160                         cmd->data_direction, sam_task_attr,
1161                         cmd->sense_buffer + 2);
1162
1163         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1164                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1165                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1166                 conn->cid);
1167
1168         target_get_sess_cmd(&cmd->se_cmd, true);
1169
1170         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1171                                                      scsilun_to_int(&hdr->lun));
1172         if (cmd->sense_reason)
1173                 goto attach_cmd;
1174
1175         /* only used for printks or comparing with ->ref_task_tag */
1176         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1177         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1178         if (cmd->sense_reason) {
1179                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1180                         return iscsit_add_reject_cmd(cmd,
1181                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1182                 }
1183
1184                 goto attach_cmd;
1185         }
1186
1187         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1188                 return iscsit_add_reject_cmd(cmd,
1189                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1190         }
1191
1192 attach_cmd:
1193         spin_lock_bh(&conn->cmd_lock);
1194         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1195         spin_unlock_bh(&conn->cmd_lock);
1196         /*
1197          * Check if we need to delay processing because of ALUA
1198          * Active/NonOptimized primary access state..
1199          */
1200         core_alua_check_nonop_delay(&cmd->se_cmd);
1201
1202         return 0;
1203 }
1204 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1205
1206 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1207 {
1208         iscsit_set_dataout_sequence_values(cmd);
1209
1210         spin_lock_bh(&cmd->dataout_timeout_lock);
1211         iscsit_start_dataout_timer(cmd, cmd->conn);
1212         spin_unlock_bh(&cmd->dataout_timeout_lock);
1213 }
1214 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1215
1216 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1217                             struct iscsi_scsi_req *hdr)
1218 {
1219         int cmdsn_ret = 0;
1220         /*
1221          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1222          * the Immediate Bit is not set, and no Immediate
1223          * Data is attached.
1224          *
1225          * A PDU/CmdSN carrying Immediate Data can only
1226          * be processed after the DataCRC has passed.
1227          * If the DataCRC fails, the CmdSN MUST NOT
1228          * be acknowledged. (See below)
1229          */
1230         if (!cmd->immediate_data) {
1231                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1232                                         (unsigned char *)hdr, hdr->cmdsn);
1233                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1234                         return -1;
1235                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1236                         target_put_sess_cmd(&cmd->se_cmd);
1237                         return 0;
1238                 }
1239         }
1240
1241         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1242
1243         /*
1244          * If no Immediate Data is attached, it's OK to return now.
1245          */
1246         if (!cmd->immediate_data) {
1247                 if (!cmd->sense_reason && cmd->unsolicited_data)
1248                         iscsit_set_unsoliticed_dataout(cmd);
1249                 if (!cmd->sense_reason)
1250                         return 0;
1251
1252                 target_put_sess_cmd(&cmd->se_cmd);
1253                 return 0;
1254         }
1255
1256         /*
1257          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1258          * execution.  These exceptions are processed in CmdSN order using
1259          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1260          */
1261         if (cmd->sense_reason) {
1262                 if (cmd->reject_reason)
1263                         return 0;
1264
1265                 return 1;
1266         }
1267         /*
1268          * Call directly into transport_generic_new_cmd() to perform
1269          * the backend memory allocation.
1270          */
1271         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1272         if (cmd->sense_reason)
1273                 return 1;
1274
1275         return 0;
1276 }
1277 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1278
1279 static int
1280 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1281                           bool dump_payload)
1282 {
1283         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1284         /*
1285          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1286          */
1287         if (dump_payload)
1288                 goto after_immediate_data;
1289
1290         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1291                                         cmd->first_burst_len);
1292 after_immediate_data:
1293         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1294                 /*
1295                  * A PDU/CmdSN carrying Immediate Data passed
1296                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1297                  * Immediate Bit is not set.
1298                  */
1299                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1300                                         (unsigned char *)hdr, hdr->cmdsn);
1301                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1302                         return -1;
1303
1304                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1305                         int rc;
1306
1307                         rc = iscsit_dump_data_payload(cmd->conn,
1308                                                       cmd->first_burst_len, 1);
1309                         target_put_sess_cmd(&cmd->se_cmd);
1310                         return rc;
1311                 } else if (cmd->unsolicited_data)
1312                         iscsit_set_unsoliticed_dataout(cmd);
1313
1314         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1315                 /*
1316                  * Immediate Data failed DataCRC and ERL>=1,
1317                  * silently drop this PDU and let the initiator
1318                  * plug the CmdSN gap.
1319                  *
1320                  * FIXME: Send Unsolicited NOPIN with reserved
1321                  * TTT here to help the initiator figure out
1322                  * the missing CmdSN, although they should be
1323                  * intelligent enough to determine the missing
1324                  * CmdSN and issue a retry to plug the sequence.
1325                  */
1326                 cmd->i_state = ISTATE_REMOVE;
1327                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1328         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1329                 return -1;
1330
1331         return 0;
1332 }
1333
1334 static int
1335 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1336                            unsigned char *buf)
1337 {
1338         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1339         int rc, immed_data;
1340         bool dump_payload = false;
1341
1342         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1343         if (rc < 0)
1344                 return 0;
1345         /*
1346          * Allocation iovecs needed for struct socket operations for
1347          * traditional iSCSI block I/O.
1348          */
1349         if (iscsit_allocate_iovecs(cmd) < 0) {
1350                 return iscsit_reject_cmd(cmd,
1351                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1352         }
1353         immed_data = cmd->immediate_data;
1354
1355         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1356         if (rc < 0)
1357                 return rc;
1358         else if (rc > 0)
1359                 dump_payload = true;
1360
1361         if (!immed_data)
1362                 return 0;
1363
1364         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1365 }
1366
1367 static u32 iscsit_do_crypto_hash_sg(
1368         struct ahash_request *hash,
1369         struct iscsi_cmd *cmd,
1370         u32 data_offset,
1371         u32 data_length,
1372         u32 padding,
1373         u8 *pad_bytes)
1374 {
1375         u32 data_crc;
1376         struct scatterlist *sg;
1377         unsigned int page_off;
1378
1379         crypto_ahash_init(hash);
1380
1381         sg = cmd->first_data_sg;
1382         page_off = cmd->first_data_sg_off;
1383
1384         while (data_length) {
1385                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1386
1387                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1388                 crypto_ahash_update(hash);
1389
1390                 data_length -= cur_len;
1391                 page_off = 0;
1392                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1393                 sg = sg_next(sg);
1394         }
1395
1396         if (padding) {
1397                 struct scatterlist pad_sg;
1398
1399                 sg_init_one(&pad_sg, pad_bytes, padding);
1400                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1401                                         padding);
1402                 crypto_ahash_finup(hash);
1403         } else {
1404                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1405                 crypto_ahash_final(hash);
1406         }
1407
1408         return data_crc;
1409 }
1410
1411 static void iscsit_do_crypto_hash_buf(
1412         struct ahash_request *hash,
1413         const void *buf,
1414         u32 payload_length,
1415         u32 padding,
1416         u8 *pad_bytes,
1417         u8 *data_crc)
1418 {
1419         struct scatterlist sg[2];
1420
1421         sg_init_table(sg, ARRAY_SIZE(sg));
1422         sg_set_buf(sg, buf, payload_length);
1423         sg_set_buf(sg + 1, pad_bytes, padding);
1424
1425         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1426
1427         crypto_ahash_digest(hash);
1428 }
1429
1430 int
1431 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1432                           struct iscsi_cmd **out_cmd)
1433 {
1434         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1435         struct iscsi_cmd *cmd = NULL;
1436         struct se_cmd *se_cmd;
1437         u32 payload_length = ntoh24(hdr->dlength);
1438         int rc;
1439
1440         if (!payload_length) {
1441                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1442                 return 0;
1443         }
1444
1445         /* iSCSI write */
1446         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1447
1448         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1449                 pr_err("DataSegmentLength: %u is greater than"
1450                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1451                         conn->conn_ops->MaxXmitDataSegmentLength);
1452                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1453                                          buf);
1454         }
1455
1456         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1457                         payload_length);
1458         if (!cmd)
1459                 return 0;
1460
1461         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1462                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1463                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1464                 payload_length, conn->cid);
1465
1466         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1467                 pr_err("Command ITT: 0x%08x received DataOUT after"
1468                         " last DataOUT received, dumping payload\n",
1469                         cmd->init_task_tag);
1470                 return iscsit_dump_data_payload(conn, payload_length, 1);
1471         }
1472
1473         if (cmd->data_direction != DMA_TO_DEVICE) {
1474                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1475                         " NON-WRITE command.\n", cmd->init_task_tag);
1476                 return iscsit_dump_data_payload(conn, payload_length, 1);
1477         }
1478         se_cmd = &cmd->se_cmd;
1479         iscsit_mod_dataout_timer(cmd);
1480
1481         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1482                 pr_err("DataOut Offset: %u, Length %u greater than"
1483                         " iSCSI Command EDTL %u, protocol error.\n",
1484                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1485                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1486         }
1487
1488         if (cmd->unsolicited_data) {
1489                 int dump_unsolicited_data = 0;
1490
1491                 if (conn->sess->sess_ops->InitialR2T) {
1492                         pr_err("Received unexpected unsolicited data"
1493                                 " while InitialR2T=Yes, protocol error.\n");
1494                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1495                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1496                         return -1;
1497                 }
1498                 /*
1499                  * Special case for dealing with Unsolicited DataOUT
1500                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1501                  * failures;
1502                  */
1503
1504                 /* Something's amiss if we're not in WRITE_PENDING state... */
1505                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1506                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1507                         dump_unsolicited_data = 1;
1508
1509                 if (dump_unsolicited_data) {
1510                         /*
1511                          * Check if a delayed TASK_ABORTED status needs to
1512                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1513                          * received with the unsolicited data out.
1514                          */
1515                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1516                                 iscsit_stop_dataout_timer(cmd);
1517
1518                         transport_check_aborted_status(se_cmd,
1519                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1520                         return iscsit_dump_data_payload(conn, payload_length, 1);
1521                 }
1522         } else {
1523                 /*
1524                  * For the normal solicited data path:
1525                  *
1526                  * Check for a delayed TASK_ABORTED status and dump any
1527                  * incoming data out payload if one exists.  Also, when the
1528                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1529                  * data out sequence, we decrement outstanding_r2ts.  Once
1530                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1531                  * TASK_ABORTED status.
1532                  */
1533                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1534                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1535                                 if (--cmd->outstanding_r2ts < 1) {
1536                                         iscsit_stop_dataout_timer(cmd);
1537                                         transport_check_aborted_status(
1538                                                         se_cmd, 1);
1539                                 }
1540
1541                         return iscsit_dump_data_payload(conn, payload_length, 1);
1542                 }
1543         }
1544         /*
1545          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1546          * within-command recovery checks before receiving the payload.
1547          */
1548         rc = iscsit_check_pre_dataout(cmd, buf);
1549         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1550                 return 0;
1551         else if (rc == DATAOUT_CANNOT_RECOVER)
1552                 return -1;
1553
1554         *out_cmd = cmd;
1555         return 0;
1556 }
1557 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1558
1559 static int
1560 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1561                    struct iscsi_data *hdr)
1562 {
1563         struct kvec *iov;
1564         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1565         u32 payload_length = ntoh24(hdr->dlength);
1566         int iov_ret, data_crc_failed = 0;
1567
1568         rx_size += payload_length;
1569         iov = &cmd->iov_data[0];
1570
1571         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1572                                    payload_length);
1573         if (iov_ret < 0)
1574                 return -1;
1575
1576         iov_count += iov_ret;
1577
1578         padding = ((-payload_length) & 3);
1579         if (padding != 0) {
1580                 iov[iov_count].iov_base = cmd->pad_bytes;
1581                 iov[iov_count++].iov_len = padding;
1582                 rx_size += padding;
1583                 pr_debug("Receiving %u padding bytes.\n", padding);
1584         }
1585
1586         if (conn->conn_ops->DataDigest) {
1587                 iov[iov_count].iov_base = &checksum;
1588                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1589                 rx_size += ISCSI_CRC_LEN;
1590         }
1591
1592         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1593
1594         iscsit_unmap_iovec(cmd);
1595
1596         if (rx_got != rx_size)
1597                 return -1;
1598
1599         if (conn->conn_ops->DataDigest) {
1600                 u32 data_crc;
1601
1602                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1603                                                     be32_to_cpu(hdr->offset),
1604                                                     payload_length, padding,
1605                                                     cmd->pad_bytes);
1606
1607                 if (checksum != data_crc) {
1608                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1609                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1610                                 " does not match computed 0x%08x\n",
1611                                 hdr->itt, hdr->offset, payload_length,
1612                                 hdr->datasn, checksum, data_crc);
1613                         data_crc_failed = 1;
1614                 } else {
1615                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1616                                 " %u bytes of Data Out\n", checksum,
1617                                 payload_length);
1618                 }
1619         }
1620
1621         return data_crc_failed;
1622 }
1623
1624 int
1625 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1626                              bool data_crc_failed)
1627 {
1628         struct iscsi_conn *conn = cmd->conn;
1629         int rc, ooo_cmdsn;
1630         /*
1631          * Increment post receive data and CRC values or perform
1632          * within-command recovery.
1633          */
1634         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1635         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1636                 return 0;
1637         else if (rc == DATAOUT_SEND_R2T) {
1638                 iscsit_set_dataout_sequence_values(cmd);
1639                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1640         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1641                 /*
1642                  * Handle extra special case for out of order
1643                  * Unsolicited Data Out.
1644                  */
1645                 spin_lock_bh(&cmd->istate_lock);
1646                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1647                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1648                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1649                 spin_unlock_bh(&cmd->istate_lock);
1650
1651                 iscsit_stop_dataout_timer(cmd);
1652                 if (ooo_cmdsn)
1653                         return 0;
1654                 target_execute_cmd(&cmd->se_cmd);
1655                 return 0;
1656         } else /* DATAOUT_CANNOT_RECOVER */
1657                 return -1;
1658
1659         return 0;
1660 }
1661 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1662
1663 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1664 {
1665         struct iscsi_cmd *cmd = NULL;
1666         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1667         int rc;
1668         bool data_crc_failed = false;
1669
1670         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1671         if (rc < 0)
1672                 return 0;
1673         else if (!cmd)
1674                 return 0;
1675
1676         rc = iscsit_get_dataout(conn, cmd, hdr);
1677         if (rc < 0)
1678                 return rc;
1679         else if (rc > 0)
1680                 data_crc_failed = true;
1681
1682         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1683 }
1684
1685 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1686                          struct iscsi_nopout *hdr)
1687 {
1688         u32 payload_length = ntoh24(hdr->dlength);
1689
1690         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1691                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1692                 if (!cmd)
1693                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1694                                                  (unsigned char *)hdr);
1695
1696                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1697                                          (unsigned char *)hdr);
1698         }
1699
1700         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1701                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1702                         " not set, protocol error.\n");
1703                 if (!cmd)
1704                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1705                                                  (unsigned char *)hdr);
1706
1707                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1708                                          (unsigned char *)hdr);
1709         }
1710
1711         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1712                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1713                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1714                         " error.\n", payload_length,
1715                         conn->conn_ops->MaxXmitDataSegmentLength);
1716                 if (!cmd)
1717                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1718                                                  (unsigned char *)hdr);
1719
1720                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1721                                          (unsigned char *)hdr);
1722         }
1723
1724         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1725                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1726                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1727                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1728                 payload_length);
1729         /*
1730          * This is not a response to a Unsolicited NopIN, which means
1731          * it can either be a NOPOUT ping request (with a valid ITT),
1732          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1733          * Either way, make sure we allocate an struct iscsi_cmd, as both
1734          * can contain ping data.
1735          */
1736         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1737                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1738                 cmd->i_state            = ISTATE_SEND_NOPIN;
1739                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1740                                                 1 : 0);
1741                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1742                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1743                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1744                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1745                 cmd->data_direction     = DMA_NONE;
1746         }
1747
1748         return 0;
1749 }
1750 EXPORT_SYMBOL(iscsit_setup_nop_out);
1751
1752 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753                            struct iscsi_nopout *hdr)
1754 {
1755         struct iscsi_cmd *cmd_p = NULL;
1756         int cmdsn_ret = 0;
1757         /*
1758          * Initiator is expecting a NopIN ping reply..
1759          */
1760         if (hdr->itt != RESERVED_ITT) {
1761                 if (!cmd)
1762                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1763                                                 (unsigned char *)hdr);
1764
1765                 spin_lock_bh(&conn->cmd_lock);
1766                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1767                 spin_unlock_bh(&conn->cmd_lock);
1768
1769                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1770
1771                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1772                         iscsit_add_cmd_to_response_queue(cmd, conn,
1773                                                          cmd->i_state);
1774                         return 0;
1775                 }
1776
1777                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1778                                 (unsigned char *)hdr, hdr->cmdsn);
1779                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1780                         return 0;
1781                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1782                         return -1;
1783
1784                 return 0;
1785         }
1786         /*
1787          * This was a response to a unsolicited NOPIN ping.
1788          */
1789         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1790                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1791                 if (!cmd_p)
1792                         return -EINVAL;
1793
1794                 iscsit_stop_nopin_response_timer(conn);
1795
1796                 cmd_p->i_state = ISTATE_REMOVE;
1797                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1798
1799                 iscsit_start_nopin_timer(conn);
1800                 return 0;
1801         }
1802         /*
1803          * Otherwise, initiator is not expecting a NOPIN is response.
1804          * Just ignore for now.
1805          */
1806         return 0;
1807 }
1808 EXPORT_SYMBOL(iscsit_process_nop_out);
1809
1810 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1811                                  unsigned char *buf)
1812 {
1813         unsigned char *ping_data = NULL;
1814         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1815         struct kvec *iov = NULL;
1816         u32 payload_length = ntoh24(hdr->dlength);
1817         int ret;
1818
1819         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1820         if (ret < 0)
1821                 return 0;
1822         /*
1823          * Handle NOP-OUT payload for traditional iSCSI sockets
1824          */
1825         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1826                 u32 checksum, data_crc, padding = 0;
1827                 int niov = 0, rx_got, rx_size = payload_length;
1828
1829                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1830                 if (!ping_data) {
1831                         pr_err("Unable to allocate memory for"
1832                                 " NOPOUT ping data.\n");
1833                         ret = -1;
1834                         goto out;
1835                 }
1836
1837                 iov = &cmd->iov_misc[0];
1838                 iov[niov].iov_base      = ping_data;
1839                 iov[niov++].iov_len     = payload_length;
1840
1841                 padding = ((-payload_length) & 3);
1842                 if (padding != 0) {
1843                         pr_debug("Receiving %u additional bytes"
1844                                 " for padding.\n", padding);
1845                         iov[niov].iov_base      = &cmd->pad_bytes;
1846                         iov[niov++].iov_len     = padding;
1847                         rx_size += padding;
1848                 }
1849                 if (conn->conn_ops->DataDigest) {
1850                         iov[niov].iov_base      = &checksum;
1851                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1852                         rx_size += ISCSI_CRC_LEN;
1853                 }
1854
1855                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1856                 if (rx_got != rx_size) {
1857                         ret = -1;
1858                         goto out;
1859                 }
1860
1861                 if (conn->conn_ops->DataDigest) {
1862                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1863                                         ping_data, payload_length,
1864                                         padding, cmd->pad_bytes,
1865                                         (u8 *)&data_crc);
1866
1867                         if (checksum != data_crc) {
1868                                 pr_err("Ping data CRC32C DataDigest"
1869                                 " 0x%08x does not match computed 0x%08x\n",
1870                                         checksum, data_crc);
1871                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1872                                         pr_err("Unable to recover from"
1873                                         " NOPOUT Ping DataCRC failure while in"
1874                                                 " ERL=0.\n");
1875                                         ret = -1;
1876                                         goto out;
1877                                 } else {
1878                                         /*
1879                                          * Silently drop this PDU and let the
1880                                          * initiator plug the CmdSN gap.
1881                                          */
1882                                         pr_debug("Dropping NOPOUT"
1883                                         " Command CmdSN: 0x%08x due to"
1884                                         " DataCRC error.\n", hdr->cmdsn);
1885                                         ret = 0;
1886                                         goto out;
1887                                 }
1888                         } else {
1889                                 pr_debug("Got CRC32C DataDigest"
1890                                 " 0x%08x for %u bytes of ping data.\n",
1891                                         checksum, payload_length);
1892                         }
1893                 }
1894
1895                 ping_data[payload_length] = '\0';
1896                 /*
1897                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1898                  */
1899                 cmd->buf_ptr = ping_data;
1900                 cmd->buf_ptr_size = payload_length;
1901
1902                 pr_debug("Got %u bytes of NOPOUT ping"
1903                         " data.\n", payload_length);
1904                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1905         }
1906
1907         return iscsit_process_nop_out(conn, cmd, hdr);
1908 out:
1909         if (cmd)
1910                 iscsit_free_cmd(cmd, false);
1911
1912         kfree(ping_data);
1913         return ret;
1914 }
1915
1916 int
1917 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1918                            unsigned char *buf)
1919 {
1920         struct se_tmr_req *se_tmr;
1921         struct iscsi_tmr_req *tmr_req;
1922         struct iscsi_tm *hdr;
1923         int out_of_order_cmdsn = 0, ret;
1924         bool sess_ref = false;
1925         u8 function;
1926
1927         hdr                     = (struct iscsi_tm *) buf;
1928         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1929         function = hdr->flags;
1930
1931         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1932                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1933                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1934                 hdr->rtt, hdr->refcmdsn, conn->cid);
1935
1936         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1937             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1938              hdr->rtt != RESERVED_ITT)) {
1939                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1940                 hdr->rtt = RESERVED_ITT;
1941         }
1942
1943         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1944                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1945                 pr_err("Task Management Request TASK_REASSIGN not"
1946                         " issued as immediate command, bad iSCSI Initiator"
1947                                 "implementation\n");
1948                 return iscsit_add_reject_cmd(cmd,
1949                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1950         }
1951         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1952             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1953                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1954
1955         cmd->data_direction = DMA_NONE;
1956
1957         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1958         if (!cmd->tmr_req) {
1959                 pr_err("Unable to allocate memory for"
1960                         " Task Management command!\n");
1961                 return iscsit_add_reject_cmd(cmd,
1962                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1963                                              buf);
1964         }
1965
1966         /*
1967          * TASK_REASSIGN for ERL=2 / connection stays inside of
1968          * LIO-Target $FABRIC_MOD
1969          */
1970         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1971
1972                 u8 tcm_function;
1973                 int ret;
1974
1975                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1976                                       conn->sess->se_sess, 0, DMA_NONE,
1977                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1978
1979                 target_get_sess_cmd(&cmd->se_cmd, true);
1980                 sess_ref = true;
1981
1982                 switch (function) {
1983                 case ISCSI_TM_FUNC_ABORT_TASK:
1984                         tcm_function = TMR_ABORT_TASK;
1985                         break;
1986                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1987                         tcm_function = TMR_ABORT_TASK_SET;
1988                         break;
1989                 case ISCSI_TM_FUNC_CLEAR_ACA:
1990                         tcm_function = TMR_CLEAR_ACA;
1991                         break;
1992                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1993                         tcm_function = TMR_CLEAR_TASK_SET;
1994                         break;
1995                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1996                         tcm_function = TMR_LUN_RESET;
1997                         break;
1998                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1999                         tcm_function = TMR_TARGET_WARM_RESET;
2000                         break;
2001                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2002                         tcm_function = TMR_TARGET_COLD_RESET;
2003                         break;
2004                 default:
2005                         pr_err("Unknown iSCSI TMR Function:"
2006                                " 0x%02x\n", function);
2007                         return iscsit_add_reject_cmd(cmd,
2008                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2009                 }
2010
2011                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2012                                          tcm_function, GFP_KERNEL);
2013                 if (ret < 0)
2014                         return iscsit_add_reject_cmd(cmd,
2015                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2016
2017                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2018         }
2019
2020         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2021         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2022         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2023         cmd->init_task_tag      = hdr->itt;
2024         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2025         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2026         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2027         se_tmr                  = cmd->se_cmd.se_tmr_req;
2028         tmr_req                 = cmd->tmr_req;
2029         /*
2030          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2031          */
2032         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2033                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2034                                                scsilun_to_int(&hdr->lun));
2035                 if (ret < 0) {
2036                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2037                         goto attach;
2038                 }
2039         }
2040
2041         switch (function) {
2042         case ISCSI_TM_FUNC_ABORT_TASK:
2043                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2044                 if (se_tmr->response)
2045                         goto attach;
2046                 break;
2047         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2048         case ISCSI_TM_FUNC_CLEAR_ACA:
2049         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2050         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2051                 break;
2052         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2053                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2054                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2055                         goto attach;
2056                 }
2057                 break;
2058         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2059                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2060                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2061                         goto attach;
2062                 }
2063                 break;
2064         case ISCSI_TM_FUNC_TASK_REASSIGN:
2065                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2066                 /*
2067                  * Perform sanity checks on the ExpDataSN only if the
2068                  * TASK_REASSIGN was successful.
2069                  */
2070                 if (se_tmr->response)
2071                         break;
2072
2073                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2074                         return iscsit_add_reject_cmd(cmd,
2075                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2076                 break;
2077         default:
2078                 pr_err("Unknown TMR function: 0x%02x, protocol"
2079                         " error.\n", function);
2080                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2081                 goto attach;
2082         }
2083
2084         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2085             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2086                 se_tmr->call_transport = 1;
2087 attach:
2088         spin_lock_bh(&conn->cmd_lock);
2089         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2090         spin_unlock_bh(&conn->cmd_lock);
2091
2092         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2093                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2094                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2095                         out_of_order_cmdsn = 1;
2096                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2097                         return 0;
2098                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2099                         return -1;
2100         }
2101         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2102
2103         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2104                 return 0;
2105         /*
2106          * Found the referenced task, send to transport for processing.
2107          */
2108         if (se_tmr->call_transport)
2109                 return transport_generic_handle_tmr(&cmd->se_cmd);
2110
2111         /*
2112          * Could not find the referenced LUN, task, or Task Management
2113          * command not authorized or supported.  Change state and
2114          * let the tx_thread send the response.
2115          *
2116          * For connection recovery, this is also the default action for
2117          * TMR TASK_REASSIGN.
2118          */
2119         if (sess_ref) {
2120                 pr_debug("Handle TMR, using sess_ref=true check\n");
2121                 target_put_sess_cmd(&cmd->se_cmd);
2122         }
2123
2124         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2125         return 0;
2126 }
2127 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2128
2129 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2130 int
2131 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2132                       struct iscsi_text *hdr)
2133 {
2134         u32 payload_length = ntoh24(hdr->dlength);
2135
2136         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2137                 pr_err("Unable to accept text parameter length: %u"
2138                         "greater than MaxXmitDataSegmentLength %u.\n",
2139                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2140                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2141                                          (unsigned char *)hdr);
2142         }
2143
2144         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2145              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2146                 pr_err("Multi sequence text commands currently not supported\n");
2147                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2148                                         (unsigned char *)hdr);
2149         }
2150
2151         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2152                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2153                 hdr->exp_statsn, payload_length);
2154
2155         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2156         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2157         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2158         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2159         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2160         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2161         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2162         cmd->data_direction     = DMA_NONE;
2163         cmd->text_in_ptr        = NULL;
2164
2165         return 0;
2166 }
2167 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2168
2169 int
2170 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2171                         struct iscsi_text *hdr)
2172 {
2173         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2174         int cmdsn_ret;
2175
2176         if (!text_in) {
2177                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2178                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2179                         pr_err("Unable to locate text_in buffer for sendtargets"
2180                                " discovery\n");
2181                         goto reject;
2182                 }
2183                 goto empty_sendtargets;
2184         }
2185         if (strncmp("SendTargets", text_in, 11) != 0) {
2186                 pr_err("Received Text Data that is not"
2187                         " SendTargets, cannot continue.\n");
2188                 goto reject;
2189         }
2190         text_ptr = strchr(text_in, '=');
2191         if (!text_ptr) {
2192                 pr_err("No \"=\" separator found in Text Data,"
2193                         "  cannot continue.\n");
2194                 goto reject;
2195         }
2196         if (!strncmp("=All", text_ptr, 4)) {
2197                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2198         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2199                    !strncmp("=eui.", text_ptr, 5)) {
2200                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2201         } else {
2202                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2203                 goto reject;
2204         }
2205
2206         spin_lock_bh(&conn->cmd_lock);
2207         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2208         spin_unlock_bh(&conn->cmd_lock);
2209
2210 empty_sendtargets:
2211         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2212
2213         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2214                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2215                                 (unsigned char *)hdr, hdr->cmdsn);
2216                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2217                         return -1;
2218
2219                 return 0;
2220         }
2221
2222         return iscsit_execute_cmd(cmd, 0);
2223
2224 reject:
2225         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2226                                  (unsigned char *)hdr);
2227 }
2228 EXPORT_SYMBOL(iscsit_process_text_cmd);
2229
2230 static int
2231 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2232                        unsigned char *buf)
2233 {
2234         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2235         char *text_in = NULL;
2236         u32 payload_length = ntoh24(hdr->dlength);
2237         int rx_size, rc;
2238
2239         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2240         if (rc < 0)
2241                 return 0;
2242
2243         rx_size = payload_length;
2244         if (payload_length) {
2245                 u32 checksum = 0, data_crc = 0;
2246                 u32 padding = 0, pad_bytes = 0;
2247                 int niov = 0, rx_got;
2248                 struct kvec iov[3];
2249
2250                 text_in = kzalloc(payload_length, GFP_KERNEL);
2251                 if (!text_in) {
2252                         pr_err("Unable to allocate memory for"
2253                                 " incoming text parameters\n");
2254                         goto reject;
2255                 }
2256                 cmd->text_in_ptr = text_in;
2257
2258                 memset(iov, 0, 3 * sizeof(struct kvec));
2259                 iov[niov].iov_base      = text_in;
2260                 iov[niov++].iov_len     = payload_length;
2261
2262                 padding = ((-payload_length) & 3);
2263                 if (padding != 0) {
2264                         iov[niov].iov_base = &pad_bytes;
2265                         iov[niov++].iov_len  = padding;
2266                         rx_size += padding;
2267                         pr_debug("Receiving %u additional bytes"
2268                                         " for padding.\n", padding);
2269                 }
2270                 if (conn->conn_ops->DataDigest) {
2271                         iov[niov].iov_base      = &checksum;
2272                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2273                         rx_size += ISCSI_CRC_LEN;
2274                 }
2275
2276                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2277                 if (rx_got != rx_size)
2278                         goto reject;
2279
2280                 if (conn->conn_ops->DataDigest) {
2281                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2282                                         text_in, payload_length,
2283                                         padding, (u8 *)&pad_bytes,
2284                                         (u8 *)&data_crc);
2285
2286                         if (checksum != data_crc) {
2287                                 pr_err("Text data CRC32C DataDigest"
2288                                         " 0x%08x does not match computed"
2289                                         " 0x%08x\n", checksum, data_crc);
2290                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2291                                         pr_err("Unable to recover from"
2292                                         " Text Data digest failure while in"
2293                                                 " ERL=0.\n");
2294                                         goto reject;
2295                                 } else {
2296                                         /*
2297                                          * Silently drop this PDU and let the
2298                                          * initiator plug the CmdSN gap.
2299                                          */
2300                                         pr_debug("Dropping Text"
2301                                         " Command CmdSN: 0x%08x due to"
2302                                         " DataCRC error.\n", hdr->cmdsn);
2303                                         kfree(text_in);
2304                                         return 0;
2305                                 }
2306                         } else {
2307                                 pr_debug("Got CRC32C DataDigest"
2308                                         " 0x%08x for %u bytes of text data.\n",
2309                                                 checksum, payload_length);
2310                         }
2311                 }
2312                 text_in[payload_length - 1] = '\0';
2313                 pr_debug("Successfully read %d bytes of text"
2314                                 " data.\n", payload_length);
2315         }
2316
2317         return iscsit_process_text_cmd(conn, cmd, hdr);
2318
2319 reject:
2320         kfree(cmd->text_in_ptr);
2321         cmd->text_in_ptr = NULL;
2322         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2323 }
2324
2325 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2326 {
2327         struct iscsi_conn *conn_p;
2328         struct iscsi_session *sess = conn->sess;
2329
2330         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2331                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2332
2333         atomic_set(&sess->session_logout, 1);
2334         atomic_set(&conn->conn_logout_remove, 1);
2335         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2336
2337         iscsit_inc_conn_usage_count(conn);
2338         iscsit_inc_session_usage_count(sess);
2339
2340         spin_lock_bh(&sess->conn_lock);
2341         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2342                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2343                         continue;
2344
2345                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2346                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2347         }
2348         spin_unlock_bh(&sess->conn_lock);
2349
2350         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2351
2352         return 0;
2353 }
2354
2355 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2356 {
2357         struct iscsi_conn *l_conn;
2358         struct iscsi_session *sess = conn->sess;
2359
2360         pr_debug("Received logout request CLOSECONNECTION for CID:"
2361                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2362
2363         /*
2364          * A Logout Request with a CLOSECONNECTION reason code for a CID
2365          * can arrive on a connection with a differing CID.
2366          */
2367         if (conn->cid == cmd->logout_cid) {
2368                 spin_lock_bh(&conn->state_lock);
2369                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2370                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371
2372                 atomic_set(&conn->conn_logout_remove, 1);
2373                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2374                 iscsit_inc_conn_usage_count(conn);
2375
2376                 spin_unlock_bh(&conn->state_lock);
2377         } else {
2378                 /*
2379                  * Handle all different cid CLOSECONNECTION requests in
2380                  * iscsit_logout_post_handler_diffcid() as to give enough
2381                  * time for any non immediate command's CmdSN to be
2382                  * acknowledged on the connection in question.
2383                  *
2384                  * Here we simply make sure the CID is still around.
2385                  */
2386                 l_conn = iscsit_get_conn_from_cid(sess,
2387                                 cmd->logout_cid);
2388                 if (!l_conn) {
2389                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2390                         iscsit_add_cmd_to_response_queue(cmd, conn,
2391                                         cmd->i_state);
2392                         return 0;
2393                 }
2394
2395                 iscsit_dec_conn_usage_count(l_conn);
2396         }
2397
2398         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2399
2400         return 0;
2401 }
2402
2403 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2404 {
2405         struct iscsi_session *sess = conn->sess;
2406
2407         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2408                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2409
2410         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2411                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2412                         " while ERL!=2.\n");
2413                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2414                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2415                 return 0;
2416         }
2417
2418         if (conn->cid == cmd->logout_cid) {
2419                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2420                         " with CID: %hu on CID: %hu, implementation error.\n",
2421                                 cmd->logout_cid, conn->cid);
2422                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2423                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424                 return 0;
2425         }
2426
2427         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2428
2429         return 0;
2430 }
2431
2432 int
2433 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2434                         unsigned char *buf)
2435 {
2436         int cmdsn_ret, logout_remove = 0;
2437         u8 reason_code = 0;
2438         struct iscsi_logout *hdr;
2439         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2440
2441         hdr                     = (struct iscsi_logout *) buf;
2442         reason_code             = (hdr->flags & 0x7f);
2443
2444         if (tiqn) {
2445                 spin_lock(&tiqn->logout_stats.lock);
2446                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2447                         tiqn->logout_stats.normal_logouts++;
2448                 else
2449                         tiqn->logout_stats.abnormal_logouts++;
2450                 spin_unlock(&tiqn->logout_stats.lock);
2451         }
2452
2453         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2454                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2455                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2456                 hdr->cid, conn->cid);
2457
2458         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2459                 pr_err("Received logout request on connection that"
2460                         " is not in logged in state, ignoring request.\n");
2461                 iscsit_free_cmd(cmd, false);
2462                 return 0;
2463         }
2464
2465         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2466         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2467         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2468         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2469         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2470         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2471         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2472         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2473         cmd->logout_reason      = reason_code;
2474         cmd->data_direction     = DMA_NONE;
2475
2476         /*
2477          * We need to sleep in these cases (by returning 1) until the Logout
2478          * Response gets sent in the tx thread.
2479          */
2480         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2481            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2482             be16_to_cpu(hdr->cid) == conn->cid))
2483                 logout_remove = 1;
2484
2485         spin_lock_bh(&conn->cmd_lock);
2486         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2487         spin_unlock_bh(&conn->cmd_lock);
2488
2489         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2490                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2491
2492         /*
2493          * Immediate commands are executed, well, immediately.
2494          * Non-Immediate Logout Commands are executed in CmdSN order.
2495          */
2496         if (cmd->immediate_cmd) {
2497                 int ret = iscsit_execute_cmd(cmd, 0);
2498
2499                 if (ret < 0)
2500                         return ret;
2501         } else {
2502                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2503                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2504                         logout_remove = 0;
2505                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2506                         return -1;
2507         }
2508
2509         return logout_remove;
2510 }
2511 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2512
2513 int iscsit_handle_snack(
2514         struct iscsi_conn *conn,
2515         unsigned char *buf)
2516 {
2517         struct iscsi_snack *hdr;
2518
2519         hdr                     = (struct iscsi_snack *) buf;
2520         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2521
2522         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2523                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2524                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2525                         hdr->begrun, hdr->runlength, conn->cid);
2526
2527         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2528                 pr_err("Initiator sent SNACK request while in"
2529                         " ErrorRecoveryLevel=0.\n");
2530                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2531                                          buf);
2532         }
2533         /*
2534          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2535          * call from inside iscsi_send_recovery_datain_or_r2t().
2536          */
2537         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2538         case 0:
2539                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2540                         hdr->itt,
2541                         be32_to_cpu(hdr->ttt),
2542                         be32_to_cpu(hdr->begrun),
2543                         be32_to_cpu(hdr->runlength));
2544         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2545                 return iscsit_handle_status_snack(conn, hdr->itt,
2546                         be32_to_cpu(hdr->ttt),
2547                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2548         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2549                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2550                         be32_to_cpu(hdr->begrun),
2551                         be32_to_cpu(hdr->runlength));
2552         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2553                 /* FIXME: Support R-Data SNACK */
2554                 pr_err("R-Data SNACK Not Supported.\n");
2555                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2556                                          buf);
2557         default:
2558                 pr_err("Unknown SNACK type 0x%02x, protocol"
2559                         " error.\n", hdr->flags & 0x0f);
2560                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561                                          buf);
2562         }
2563
2564         return 0;
2565 }
2566 EXPORT_SYMBOL(iscsit_handle_snack);
2567
2568 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2569 {
2570         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2571             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2572                 wait_for_completion_interruptible_timeout(
2573                                         &conn->rx_half_close_comp,
2574                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2575         }
2576 }
2577
2578 static int iscsit_handle_immediate_data(
2579         struct iscsi_cmd *cmd,
2580         struct iscsi_scsi_req *hdr,
2581         u32 length)
2582 {
2583         int iov_ret, rx_got = 0, rx_size = 0;
2584         u32 checksum, iov_count = 0, padding = 0;
2585         struct iscsi_conn *conn = cmd->conn;
2586         struct kvec *iov;
2587
2588         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2589         if (iov_ret < 0)
2590                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2591
2592         rx_size = length;
2593         iov_count = iov_ret;
2594         iov = &cmd->iov_data[0];
2595
2596         padding = ((-length) & 3);
2597         if (padding != 0) {
2598                 iov[iov_count].iov_base = cmd->pad_bytes;
2599                 iov[iov_count++].iov_len = padding;
2600                 rx_size += padding;
2601         }
2602
2603         if (conn->conn_ops->DataDigest) {
2604                 iov[iov_count].iov_base         = &checksum;
2605                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2606                 rx_size += ISCSI_CRC_LEN;
2607         }
2608
2609         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2610
2611         iscsit_unmap_iovec(cmd);
2612
2613         if (rx_got != rx_size) {
2614                 iscsit_rx_thread_wait_for_tcp(conn);
2615                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2616         }
2617
2618         if (conn->conn_ops->DataDigest) {
2619                 u32 data_crc;
2620
2621                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2622                                                     cmd->write_data_done, length, padding,
2623                                                     cmd->pad_bytes);
2624
2625                 if (checksum != data_crc) {
2626                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2627                                 " does not match computed 0x%08x\n", checksum,
2628                                 data_crc);
2629
2630                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2631                                 pr_err("Unable to recover from"
2632                                         " Immediate Data digest failure while"
2633                                         " in ERL=0.\n");
2634                                 iscsit_reject_cmd(cmd,
2635                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2636                                                 (unsigned char *)hdr);
2637                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2638                         } else {
2639                                 iscsit_reject_cmd(cmd,
2640                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2641                                                 (unsigned char *)hdr);
2642                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2643                         }
2644                 } else {
2645                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2646                                 " %u bytes of Immediate Data\n", checksum,
2647                                 length);
2648                 }
2649         }
2650
2651         cmd->write_data_done += length;
2652
2653         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2654                 spin_lock_bh(&cmd->istate_lock);
2655                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2656                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2657                 spin_unlock_bh(&cmd->istate_lock);
2658         }
2659
2660         return IMMEDIATE_DATA_NORMAL_OPERATION;
2661 }
2662
2663 /*
2664  *      Called with sess->conn_lock held.
2665  */
2666 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2667         with active network interface */
2668 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2669 {
2670         struct iscsi_cmd *cmd;
2671         struct iscsi_conn *conn_p;
2672         bool found = false;
2673
2674         /*
2675          * Only send a Asynchronous Message on connections whos network
2676          * interface is still functional.
2677          */
2678         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2679                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2680                         iscsit_inc_conn_usage_count(conn_p);
2681                         found = true;
2682                         break;
2683                 }
2684         }
2685
2686         if (!found)
2687                 return;
2688
2689         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2690         if (!cmd) {
2691                 iscsit_dec_conn_usage_count(conn_p);
2692                 return;
2693         }
2694
2695         cmd->logout_cid = conn->cid;
2696         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2697         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2698
2699         spin_lock_bh(&conn_p->cmd_lock);
2700         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2701         spin_unlock_bh(&conn_p->cmd_lock);
2702
2703         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2704         iscsit_dec_conn_usage_count(conn_p);
2705 }
2706
2707 static int iscsit_send_conn_drop_async_message(
2708         struct iscsi_cmd *cmd,
2709         struct iscsi_conn *conn)
2710 {
2711         struct iscsi_async *hdr;
2712
2713         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2714
2715         hdr                     = (struct iscsi_async *) cmd->pdu;
2716         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2717         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2718         cmd->init_task_tag      = RESERVED_ITT;
2719         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2720         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2721         cmd->stat_sn            = conn->stat_sn++;
2722         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2723         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2724         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2725         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2726         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2727         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2728         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2729
2730         pr_debug("Sending Connection Dropped Async Message StatSN:"
2731                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2732                         cmd->logout_cid, conn->cid);
2733
2734         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2735 }
2736
2737 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2738 {
2739         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2740             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2741                 wait_for_completion_interruptible_timeout(
2742                                         &conn->tx_half_close_comp,
2743                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2744         }
2745 }
2746
2747 void
2748 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2749                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2750                         bool set_statsn)
2751 {
2752         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2753         hdr->flags              = datain->flags;
2754         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2755                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2756                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2757                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2758                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2759                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2760                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2761                 }
2762         }
2763         hton24(hdr->dlength, datain->length);
2764         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2765                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2766                                 (struct scsi_lun *)&hdr->lun);
2767         else
2768                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2769
2770         hdr->itt                = cmd->init_task_tag;
2771
2772         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2773                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2774         else
2775                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2776         if (set_statsn)
2777                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2778         else
2779                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2780
2781         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2782         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2783         hdr->datasn             = cpu_to_be32(datain->data_sn);
2784         hdr->offset             = cpu_to_be32(datain->offset);
2785
2786         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2787                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2788                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2789                 ntohl(hdr->offset), datain->length, conn->cid);
2790 }
2791 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2792
2793 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2794 {
2795         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2796         struct iscsi_datain datain;
2797         struct iscsi_datain_req *dr;
2798         int eodr = 0, ret;
2799         bool set_statsn = false;
2800
2801         memset(&datain, 0, sizeof(struct iscsi_datain));
2802         dr = iscsit_get_datain_values(cmd, &datain);
2803         if (!dr) {
2804                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2805                                 cmd->init_task_tag);
2806                 return -1;
2807         }
2808         /*
2809          * Be paranoid and double check the logic for now.
2810          */
2811         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2812                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2813                         " datain.length: %u exceeds cmd->data_length: %u\n",
2814                         cmd->init_task_tag, datain.offset, datain.length,
2815                         cmd->se_cmd.data_length);
2816                 return -1;
2817         }
2818
2819         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2820         /*
2821          * Special case for successfully execution w/ both DATAIN
2822          * and Sense Data.
2823          */
2824         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2825             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2826                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2827         else {
2828                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2829                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2830                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2831                         cmd->stat_sn = conn->stat_sn++;
2832                         set_statsn = true;
2833                 } else if (dr->dr_complete ==
2834                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2835                         set_statsn = true;
2836         }
2837
2838         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2839
2840         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2841         if (ret < 0)
2842                 return ret;
2843
2844         if (dr->dr_complete) {
2845                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2846                                 2 : 1;
2847                 iscsit_free_datain_req(cmd, dr);
2848         }
2849
2850         return eodr;
2851 }
2852
2853 int
2854 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2855                         struct iscsi_logout_rsp *hdr)
2856 {
2857         struct iscsi_conn *logout_conn = NULL;
2858         struct iscsi_conn_recovery *cr = NULL;
2859         struct iscsi_session *sess = conn->sess;
2860         /*
2861          * The actual shutting down of Sessions and/or Connections
2862          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2863          * is done in scsi_logout_post_handler().
2864          */
2865         switch (cmd->logout_reason) {
2866         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2867                 pr_debug("iSCSI session logout successful, setting"
2868                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2869                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2870                 break;
2871         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2872                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2873                         break;
2874                 /*
2875                  * For CLOSECONNECTION logout requests carrying
2876                  * a matching logout CID -> local CID, the reference
2877                  * for the local CID will have been incremented in
2878                  * iscsi_logout_closeconnection().
2879                  *
2880                  * For CLOSECONNECTION logout requests carrying
2881                  * a different CID than the connection it arrived
2882                  * on, the connection responding to cmd->logout_cid
2883                  * is stopped in iscsit_logout_post_handler_diffcid().
2884                  */
2885
2886                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2887                         " successful.\n", cmd->logout_cid, conn->cid);
2888                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2889                 break;
2890         case ISCSI_LOGOUT_REASON_RECOVERY:
2891                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2892                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2893                         break;
2894                 /*
2895                  * If the connection is still active from our point of view
2896                  * force connection recovery to occur.
2897                  */
2898                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2899                                 cmd->logout_cid);
2900                 if (logout_conn) {
2901                         iscsit_connection_reinstatement_rcfr(logout_conn);
2902                         iscsit_dec_conn_usage_count(logout_conn);
2903                 }
2904
2905                 cr = iscsit_get_inactive_connection_recovery_entry(
2906                                 conn->sess, cmd->logout_cid);
2907                 if (!cr) {
2908                         pr_err("Unable to locate CID: %hu for"
2909                         " REMOVECONNFORRECOVERY Logout Request.\n",
2910                                 cmd->logout_cid);
2911                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2912                         break;
2913                 }
2914
2915                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2916
2917                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2918                         " for recovery for CID: %hu on CID: %hu successful.\n",
2919                                 cmd->logout_cid, conn->cid);
2920                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2921                 break;
2922         default:
2923                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2924                                 cmd->logout_reason);
2925                 return -1;
2926         }
2927
2928         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2929         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2930         hdr->response           = cmd->logout_response;
2931         hdr->itt                = cmd->init_task_tag;
2932         cmd->stat_sn            = conn->stat_sn++;
2933         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2934
2935         iscsit_increment_maxcmdsn(cmd, conn->sess);
2936         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2937         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2938
2939         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2940                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2941                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2942                 cmd->logout_cid, conn->cid);
2943
2944         return 0;
2945 }
2946 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2947
2948 static int
2949 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2950 {
2951         int rc;
2952
2953         rc = iscsit_build_logout_rsp(cmd, conn,
2954                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2955         if (rc < 0)
2956                 return rc;
2957
2958         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2959 }
2960
2961 void
2962 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2963                        struct iscsi_nopin *hdr, bool nopout_response)
2964 {
2965         hdr->opcode             = ISCSI_OP_NOOP_IN;
2966         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2967         hton24(hdr->dlength, cmd->buf_ptr_size);
2968         if (nopout_response)
2969                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2970         hdr->itt                = cmd->init_task_tag;
2971         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2972         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2973                                   conn->stat_sn;
2974         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2975
2976         if (nopout_response)
2977                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2978
2979         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2980         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2981
2982         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2983                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2984                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2985                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2986 }
2987 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2988
2989 /*
2990  *      Unsolicited NOPIN, either requesting a response or not.
2991  */
2992 static int iscsit_send_unsolicited_nopin(
2993         struct iscsi_cmd *cmd,
2994         struct iscsi_conn *conn,
2995         int want_response)
2996 {
2997         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2998         int ret;
2999
3000         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3001
3002         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3003                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3004
3005         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3006         if (ret < 0)
3007                 return ret;
3008
3009         spin_lock_bh(&cmd->istate_lock);
3010         cmd->i_state = want_response ?
3011                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3012         spin_unlock_bh(&cmd->istate_lock);
3013
3014         return 0;
3015 }
3016
3017 static int
3018 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3019 {
3020         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3021
3022         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3023
3024         /*
3025          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3026          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3027          */
3028         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3029
3030         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3031                                                      cmd->buf_ptr,
3032                                                      cmd->buf_ptr_size);
3033 }
3034
3035 static int iscsit_send_r2t(
3036         struct iscsi_cmd *cmd,
3037         struct iscsi_conn *conn)
3038 {
3039         struct iscsi_r2t *r2t;
3040         struct iscsi_r2t_rsp *hdr;
3041         int ret;
3042
3043         r2t = iscsit_get_r2t_from_list(cmd);
3044         if (!r2t)
3045                 return -1;
3046
3047         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3048         memset(hdr, 0, ISCSI_HDR_LEN);
3049         hdr->opcode             = ISCSI_OP_R2T;
3050         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3051         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3052                         (struct scsi_lun *)&hdr->lun);
3053         hdr->itt                = cmd->init_task_tag;
3054         if (conn->conn_transport->iscsit_get_r2t_ttt)
3055                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3056         else
3057                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3058         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3059         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3060         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3061         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3062         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3063         hdr->data_offset        = cpu_to_be32(r2t->offset);
3064         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3065
3066         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3067                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3068                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3069                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3070                         r2t->offset, r2t->xfer_len, conn->cid);
3071
3072         spin_lock_bh(&cmd->r2t_lock);
3073         r2t->sent_r2t = 1;
3074         spin_unlock_bh(&cmd->r2t_lock);
3075
3076         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3077         if (ret < 0) {
3078                 return ret;
3079         }
3080
3081         spin_lock_bh(&cmd->dataout_timeout_lock);
3082         iscsit_start_dataout_timer(cmd, conn);
3083         spin_unlock_bh(&cmd->dataout_timeout_lock);
3084
3085         return 0;
3086 }
3087
3088 /*
3089  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3090  *              connection recovery.
3091  */
3092 int iscsit_build_r2ts_for_cmd(
3093         struct iscsi_conn *conn,
3094         struct iscsi_cmd *cmd,
3095         bool recovery)
3096 {
3097         int first_r2t = 1;
3098         u32 offset = 0, xfer_len = 0;
3099
3100         spin_lock_bh(&cmd->r2t_lock);
3101         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3102                 spin_unlock_bh(&cmd->r2t_lock);
3103                 return 0;
3104         }
3105
3106         if (conn->sess->sess_ops->DataSequenceInOrder &&
3107             !recovery)
3108                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3109
3110         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3111                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3112                         offset = cmd->r2t_offset;
3113
3114                         if (first_r2t && recovery) {
3115                                 int new_data_end = offset +
3116                                         conn->sess->sess_ops->MaxBurstLength -
3117                                         cmd->next_burst_len;
3118
3119                                 if (new_data_end > cmd->se_cmd.data_length)
3120                                         xfer_len = cmd->se_cmd.data_length - offset;
3121                                 else
3122                                         xfer_len =
3123                                                 conn->sess->sess_ops->MaxBurstLength -
3124                                                 cmd->next_burst_len;
3125                         } else {
3126                                 int new_data_end = offset +
3127                                         conn->sess->sess_ops->MaxBurstLength;
3128
3129                                 if (new_data_end > cmd->se_cmd.data_length)
3130                                         xfer_len = cmd->se_cmd.data_length - offset;
3131                                 else
3132                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3133                         }
3134                         cmd->r2t_offset += xfer_len;
3135
3136                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3137                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3138                 } else {
3139                         struct iscsi_seq *seq;
3140
3141                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3142                         if (!seq) {
3143                                 spin_unlock_bh(&cmd->r2t_lock);
3144                                 return -1;
3145                         }
3146
3147                         offset = seq->offset;
3148                         xfer_len = seq->xfer_len;
3149
3150                         if (cmd->seq_send_order == cmd->seq_count)
3151                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3152                 }
3153                 cmd->outstanding_r2ts++;
3154                 first_r2t = 0;
3155
3156                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3157                         spin_unlock_bh(&cmd->r2t_lock);
3158                         return -1;
3159                 }
3160
3161                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3162                         break;
3163         }
3164         spin_unlock_bh(&cmd->r2t_lock);
3165
3166         return 0;
3167 }
3168 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3169
3170 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3171                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3172 {
3173         if (inc_stat_sn)
3174                 cmd->stat_sn = conn->stat_sn++;
3175
3176         atomic_long_inc(&conn->sess->rsp_pdus);
3177
3178         memset(hdr, 0, ISCSI_HDR_LEN);
3179         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3180         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3181         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3182                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3183                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3184         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3185                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3186                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3187         }
3188         hdr->response           = cmd->iscsi_response;
3189         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3190         hdr->itt                = cmd->init_task_tag;
3191         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3192
3193         iscsit_increment_maxcmdsn(cmd, conn->sess);
3194         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3195         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3196
3197         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3198                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3199                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3200                 cmd->se_cmd.scsi_status, conn->cid);
3201 }
3202 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3203
3204 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3205 {
3206         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3207         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3208         void *data_buf = NULL;
3209         u32 padding = 0, data_buf_len = 0;
3210
3211         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3212
3213         /*
3214          * Attach SENSE DATA payload to iSCSI Response PDU
3215          */
3216         if (cmd->se_cmd.sense_buffer &&
3217            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3218             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3219                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3220                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3221
3222                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3223                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3224                 data_buf = cmd->sense_buffer;
3225                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3226
3227                 if (padding) {
3228                         memset(cmd->sense_buffer +
3229                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3230                         pr_debug("Adding %u bytes of padding to"
3231                                 " SENSE.\n", padding);
3232                 }
3233
3234                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3235                                 " Response PDU\n",
3236                                 cmd->se_cmd.scsi_sense_length);
3237         }
3238
3239         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3240                                                      data_buf_len);
3241 }
3242
3243 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3244 {
3245         switch (se_tmr->response) {
3246         case TMR_FUNCTION_COMPLETE:
3247                 return ISCSI_TMF_RSP_COMPLETE;
3248         case TMR_TASK_DOES_NOT_EXIST:
3249                 return ISCSI_TMF_RSP_NO_TASK;
3250         case TMR_LUN_DOES_NOT_EXIST:
3251                 return ISCSI_TMF_RSP_NO_LUN;
3252         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3253                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3254         case TMR_FUNCTION_REJECTED:
3255         default:
3256                 return ISCSI_TMF_RSP_REJECTED;
3257         }
3258 }
3259
3260 void
3261 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3262                           struct iscsi_tm_rsp *hdr)
3263 {
3264         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3265
3266         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3267         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3268         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3269         hdr->itt                = cmd->init_task_tag;
3270         cmd->stat_sn            = conn->stat_sn++;
3271         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3272
3273         iscsit_increment_maxcmdsn(cmd, conn->sess);
3274         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3275         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3276
3277         pr_debug("Built Task Management Response ITT: 0x%08x,"
3278                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3279                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3280 }
3281 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3282
3283 static int
3284 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3285 {
3286         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3287
3288         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3289
3290         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3291 }
3292
3293 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3294 {
3295         bool ret = false;
3296
3297         if (np->np_sockaddr.ss_family == AF_INET6) {
3298                 const struct sockaddr_in6 sin6 = {
3299                         .sin6_addr = IN6ADDR_ANY_INIT };
3300                 struct sockaddr_in6 *sock_in6 =
3301                          (struct sockaddr_in6 *)&np->np_sockaddr;
3302
3303                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3304                                 sin6.sin6_addr.s6_addr, 16))
3305                         ret = true;
3306         } else {
3307                 struct sockaddr_in * sock_in =
3308                         (struct sockaddr_in *)&np->np_sockaddr;
3309
3310                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3311                         ret = true;
3312         }
3313
3314         return ret;
3315 }
3316
3317 #define SENDTARGETS_BUF_LIMIT 32768U
3318
3319 static int
3320 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3321                                   enum iscsit_transport_type network_transport,
3322                                   int skip_bytes, bool *completed)
3323 {
3324         char *payload = NULL;
3325         struct iscsi_conn *conn = cmd->conn;
3326         struct iscsi_portal_group *tpg;
3327         struct iscsi_tiqn *tiqn;
3328         struct iscsi_tpg_np *tpg_np;
3329         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3330         int target_name_printed;
3331         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3332         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3333         bool active;
3334
3335         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3336                          SENDTARGETS_BUF_LIMIT);
3337
3338         payload = kzalloc(buffer_len, GFP_KERNEL);
3339         if (!payload) {
3340                 pr_err("Unable to allocate memory for sendtargets"
3341                                 " response.\n");
3342                 return -ENOMEM;
3343         }
3344         /*
3345          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3346          * explicit case..
3347          */
3348         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3349                 text_ptr = strchr(text_in, '=');
3350                 if (!text_ptr) {
3351                         pr_err("Unable to locate '=' string in text_in:"
3352                                " %s\n", text_in);
3353                         kfree(payload);
3354                         return -EINVAL;
3355                 }
3356                 /*
3357                  * Skip over '=' character..
3358                  */
3359                 text_ptr += 1;
3360         }
3361
3362         spin_lock(&tiqn_lock);
3363         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3364                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3365                      strcmp(tiqn->tiqn, text_ptr)) {
3366                         continue;
3367                 }
3368
3369                 target_name_printed = 0;
3370
3371                 spin_lock(&tiqn->tiqn_tpg_lock);
3372                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3373
3374                         /* If demo_mode_discovery=0 and generate_node_acls=0
3375                          * (demo mode dislabed) do not return
3376                          * TargetName+TargetAddress unless a NodeACL exists.
3377                          */
3378
3379                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3380                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3381                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3382                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3383                                 continue;
3384                         }
3385
3386                         spin_lock(&tpg->tpg_state_lock);
3387                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3388                         spin_unlock(&tpg->tpg_state_lock);
3389
3390                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3391                                 continue;
3392
3393                         spin_lock(&tpg->tpg_np_lock);
3394                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3395                                                 tpg_np_list) {
3396                                 struct iscsi_np *np = tpg_np->tpg_np;
3397                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3398                                 struct sockaddr_storage *sockaddr;
3399
3400                                 if (np->np_network_transport != network_transport)
3401                                         continue;
3402
3403                                 if (!target_name_printed) {
3404                                         len = sprintf(buf, "TargetName=%s",
3405                                                       tiqn->tiqn);
3406                                         len += 1;
3407
3408                                         if ((len + payload_len) > buffer_len) {
3409                                                 spin_unlock(&tpg->tpg_np_lock);
3410                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3411                                                 end_of_buf = 1;
3412                                                 goto eob;
3413                                         }
3414
3415                                         if (skip_bytes && len <= skip_bytes) {
3416                                                 skip_bytes -= len;
3417                                         } else {
3418                                                 memcpy(payload + payload_len, buf, len);
3419                                                 payload_len += len;
3420                                                 target_name_printed = 1;
3421                                                 if (len > skip_bytes)
3422                                                         skip_bytes = 0;
3423                                         }
3424                                 }
3425
3426                                 if (inaddr_any)
3427                                         sockaddr = &conn->local_sockaddr;
3428                                 else
3429                                         sockaddr = &np->np_sockaddr;
3430
3431                                 len = sprintf(buf, "TargetAddress="
3432                                               "%pISpc,%hu",
3433                                               sockaddr,
3434                                               tpg->tpgt);
3435                                 len += 1;
3436
3437                                 if ((len + payload_len) > buffer_len) {
3438                                         spin_unlock(&tpg->tpg_np_lock);
3439                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3440                                         end_of_buf = 1;
3441                                         goto eob;
3442                                 }
3443
3444                                 if (skip_bytes && len <= skip_bytes) {
3445                                         skip_bytes -= len;
3446                                 } else {
3447                                         memcpy(payload + payload_len, buf, len);
3448                                         payload_len += len;
3449                                         if (len > skip_bytes)
3450                                                 skip_bytes = 0;
3451                                 }
3452                         }
3453                         spin_unlock(&tpg->tpg_np_lock);
3454                 }
3455                 spin_unlock(&tiqn->tiqn_tpg_lock);
3456 eob:
3457                 if (end_of_buf) {
3458                         *completed = false;
3459                         break;
3460                 }
3461
3462                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3463                         break;
3464         }
3465         spin_unlock(&tiqn_lock);
3466
3467         cmd->buf_ptr = payload;
3468
3469         return payload_len;
3470 }
3471
3472 int
3473 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3474                       struct iscsi_text_rsp *hdr,
3475                       enum iscsit_transport_type network_transport)
3476 {
3477         int text_length, padding;
3478         bool completed = true;
3479
3480         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3481                                                         cmd->read_data_done,
3482                                                         &completed);
3483         if (text_length < 0)
3484                 return text_length;
3485
3486         if (completed) {
3487                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3488         } else {
3489                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3490                 cmd->read_data_done += text_length;
3491                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3492                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3493         }
3494         hdr->opcode = ISCSI_OP_TEXT_RSP;
3495         padding = ((-text_length) & 3);
3496         hton24(hdr->dlength, text_length);
3497         hdr->itt = cmd->init_task_tag;
3498         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3499         cmd->stat_sn = conn->stat_sn++;
3500         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3501
3502         iscsit_increment_maxcmdsn(cmd, conn->sess);
3503         /*
3504          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3505          * correctly increment MaxCmdSN for each response answering a
3506          * non immediate text request with a valid CmdSN.
3507          */
3508         cmd->maxcmdsn_inc = 0;
3509         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3510         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3511
3512         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3513                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3514                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3515                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3516                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3517
3518         return text_length + padding;
3519 }
3520 EXPORT_SYMBOL(iscsit_build_text_rsp);
3521
3522 static int iscsit_send_text_rsp(
3523         struct iscsi_cmd *cmd,
3524         struct iscsi_conn *conn)
3525 {
3526         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3527         int text_length;
3528
3529         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3530                                 conn->conn_transport->transport_type);
3531         if (text_length < 0)
3532                 return text_length;
3533
3534         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3535                                                      cmd->buf_ptr,
3536                                                      text_length);
3537 }
3538
3539 void
3540 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3541                     struct iscsi_reject *hdr)
3542 {
3543         hdr->opcode             = ISCSI_OP_REJECT;
3544         hdr->reason             = cmd->reject_reason;
3545         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3546         hton24(hdr->dlength, ISCSI_HDR_LEN);
3547         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3548         cmd->stat_sn            = conn->stat_sn++;
3549         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3550         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3551         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3552
3553 }
3554 EXPORT_SYMBOL(iscsit_build_reject);
3555
3556 static int iscsit_send_reject(
3557         struct iscsi_cmd *cmd,
3558         struct iscsi_conn *conn)
3559 {
3560         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3561
3562         iscsit_build_reject(cmd, conn, hdr);
3563
3564         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3565                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3566
3567         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3568                                                      cmd->buf_ptr,
3569                                                      ISCSI_HDR_LEN);
3570 }
3571
3572 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3573 {
3574         int ord, cpu;
3575         /*
3576          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3577          * within iscsit_start_kthreads()
3578          *
3579          * Here we use bitmap_id to determine which CPU that this
3580          * iSCSI connection's RX/TX threads will be scheduled to
3581          * execute upon.
3582          */
3583         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3584         for_each_online_cpu(cpu) {
3585                 if (ord-- == 0) {
3586                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3587                         return;
3588                 }
3589         }
3590         /*
3591          * This should never be reached..
3592          */
3593         dump_stack();
3594         cpumask_setall(conn->conn_cpumask);
3595 }
3596
3597 int
3598 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3599 {
3600         int ret;
3601
3602         switch (state) {
3603         case ISTATE_SEND_R2T:
3604                 ret = iscsit_send_r2t(cmd, conn);
3605                 if (ret < 0)
3606                         goto err;
3607                 break;
3608         case ISTATE_REMOVE:
3609                 spin_lock_bh(&conn->cmd_lock);
3610                 list_del_init(&cmd->i_conn_node);
3611                 spin_unlock_bh(&conn->cmd_lock);
3612
3613                 iscsit_free_cmd(cmd, false);
3614                 break;
3615         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3616                 iscsit_mod_nopin_response_timer(conn);
3617                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3618                 if (ret < 0)
3619                         goto err;
3620                 break;
3621         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3622                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3623                 if (ret < 0)
3624                         goto err;
3625                 break;
3626         default:
3627                 pr_err("Unknown Opcode: 0x%02x ITT:"
3628                        " 0x%08x, i_state: %d on CID: %hu\n",
3629                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3630                        conn->cid);
3631                 goto err;
3632         }
3633
3634         return 0;
3635
3636 err:
3637         return -1;
3638 }
3639 EXPORT_SYMBOL(iscsit_immediate_queue);
3640
3641 static int
3642 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3643 {
3644         struct iscsit_transport *t = conn->conn_transport;
3645         struct iscsi_queue_req *qr;
3646         struct iscsi_cmd *cmd;
3647         u8 state;
3648         int ret;
3649
3650         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3651                 atomic_set(&conn->check_immediate_queue, 0);
3652                 cmd = qr->cmd;
3653                 state = qr->state;
3654                 kmem_cache_free(lio_qr_cache, qr);
3655
3656                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3657                 if (ret < 0)
3658                         return ret;
3659         }
3660
3661         return 0;
3662 }
3663
3664 int
3665 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3666 {
3667         int ret;
3668
3669 check_rsp_state:
3670         switch (state) {
3671         case ISTATE_SEND_DATAIN:
3672                 ret = iscsit_send_datain(cmd, conn);
3673                 if (ret < 0)
3674                         goto err;
3675                 else if (!ret)
3676                         /* more drs */
3677                         goto check_rsp_state;
3678                 else if (ret == 1) {
3679                         /* all done */
3680                         spin_lock_bh(&cmd->istate_lock);
3681                         cmd->i_state = ISTATE_SENT_STATUS;
3682                         spin_unlock_bh(&cmd->istate_lock);
3683
3684                         if (atomic_read(&conn->check_immediate_queue))
3685                                 return 1;
3686
3687                         return 0;
3688                 } else if (ret == 2) {
3689                         /* Still must send status,
3690                            SCF_TRANSPORT_TASK_SENSE was set */
3691                         spin_lock_bh(&cmd->istate_lock);
3692                         cmd->i_state = ISTATE_SEND_STATUS;
3693                         spin_unlock_bh(&cmd->istate_lock);
3694                         state = ISTATE_SEND_STATUS;
3695                         goto check_rsp_state;
3696                 }
3697
3698                 break;
3699         case ISTATE_SEND_STATUS:
3700         case ISTATE_SEND_STATUS_RECOVERY:
3701                 ret = iscsit_send_response(cmd, conn);
3702                 break;
3703         case ISTATE_SEND_LOGOUTRSP:
3704                 ret = iscsit_send_logout(cmd, conn);
3705                 break;
3706         case ISTATE_SEND_ASYNCMSG:
3707                 ret = iscsit_send_conn_drop_async_message(
3708                         cmd, conn);
3709                 break;
3710         case ISTATE_SEND_NOPIN:
3711                 ret = iscsit_send_nopin(cmd, conn);
3712                 break;
3713         case ISTATE_SEND_REJECT:
3714                 ret = iscsit_send_reject(cmd, conn);
3715                 break;
3716         case ISTATE_SEND_TASKMGTRSP:
3717                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3718                 if (ret != 0)
3719                         break;
3720                 ret = iscsit_tmr_post_handler(cmd, conn);
3721                 if (ret != 0)
3722                         iscsit_fall_back_to_erl0(conn->sess);
3723                 break;
3724         case ISTATE_SEND_TEXTRSP:
3725                 ret = iscsit_send_text_rsp(cmd, conn);
3726                 break;
3727         default:
3728                 pr_err("Unknown Opcode: 0x%02x ITT:"
3729                        " 0x%08x, i_state: %d on CID: %hu\n",
3730                        cmd->iscsi_opcode, cmd->init_task_tag,
3731                        state, conn->cid);
3732                 goto err;
3733         }
3734         if (ret < 0)
3735                 goto err;
3736
3737         switch (state) {
3738         case ISTATE_SEND_LOGOUTRSP:
3739                 if (!iscsit_logout_post_handler(cmd, conn))
3740                         return -ECONNRESET;
3741                 /* fall through */
3742         case ISTATE_SEND_STATUS:
3743         case ISTATE_SEND_ASYNCMSG:
3744         case ISTATE_SEND_NOPIN:
3745         case ISTATE_SEND_STATUS_RECOVERY:
3746         case ISTATE_SEND_TEXTRSP:
3747         case ISTATE_SEND_TASKMGTRSP:
3748         case ISTATE_SEND_REJECT:
3749                 spin_lock_bh(&cmd->istate_lock);
3750                 cmd->i_state = ISTATE_SENT_STATUS;
3751                 spin_unlock_bh(&cmd->istate_lock);
3752                 break;
3753         default:
3754                 pr_err("Unknown Opcode: 0x%02x ITT:"
3755                        " 0x%08x, i_state: %d on CID: %hu\n",
3756                        cmd->iscsi_opcode, cmd->init_task_tag,
3757                        cmd->i_state, conn->cid);
3758                 goto err;
3759         }
3760
3761         if (atomic_read(&conn->check_immediate_queue))
3762                 return 1;
3763
3764         return 0;
3765
3766 err:
3767         return -1;
3768 }
3769 EXPORT_SYMBOL(iscsit_response_queue);
3770
3771 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3772 {
3773         struct iscsit_transport *t = conn->conn_transport;
3774         struct iscsi_queue_req *qr;
3775         struct iscsi_cmd *cmd;
3776         u8 state;
3777         int ret;
3778
3779         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3780                 cmd = qr->cmd;
3781                 state = qr->state;
3782                 kmem_cache_free(lio_qr_cache, qr);
3783
3784                 ret = t->iscsit_response_queue(conn, cmd, state);
3785                 if (ret == 1 || ret < 0)
3786                         return ret;
3787         }
3788
3789         return 0;
3790 }
3791
3792 int iscsi_target_tx_thread(void *arg)
3793 {
3794         int ret = 0;
3795         struct iscsi_conn *conn = arg;
3796         /*
3797          * Allow ourselves to be interrupted by SIGINT so that a
3798          * connection recovery / failure event can be triggered externally.
3799          */
3800         allow_signal(SIGINT);
3801
3802         while (!kthread_should_stop()) {
3803                 /*
3804                  * Ensure that both TX and RX per connection kthreads
3805                  * are scheduled to run on the same CPU.
3806                  */
3807                 iscsit_thread_check_cpumask(conn, current, 1);
3808
3809                 wait_event_interruptible(conn->queues_wq,
3810                                          !iscsit_conn_all_queues_empty(conn));
3811
3812                 if (signal_pending(current))
3813                         goto transport_err;
3814
3815 get_immediate:
3816                 ret = iscsit_handle_immediate_queue(conn);
3817                 if (ret < 0)
3818                         goto transport_err;
3819
3820                 ret = iscsit_handle_response_queue(conn);
3821                 if (ret == 1)
3822                         goto get_immediate;
3823                 else if (ret == -ECONNRESET)
3824                         goto out;
3825                 else if (ret < 0)
3826                         goto transport_err;
3827         }
3828
3829 transport_err:
3830         /*
3831          * Avoid the normal connection failure code-path if this connection
3832          * is still within LOGIN mode, and iscsi_np process context is
3833          * responsible for cleaning up the early connection failure.
3834          */
3835         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3836                 iscsit_take_action_for_connection_exit(conn);
3837 out:
3838         return 0;
3839 }
3840
3841 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3842 {
3843         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3844         struct iscsi_cmd *cmd;
3845         int ret = 0;
3846
3847         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3848         case ISCSI_OP_SCSI_CMD:
3849                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3850                 if (!cmd)
3851                         goto reject;
3852
3853                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3854                 break;
3855         case ISCSI_OP_SCSI_DATA_OUT:
3856                 ret = iscsit_handle_data_out(conn, buf);
3857                 break;
3858         case ISCSI_OP_NOOP_OUT:
3859                 cmd = NULL;
3860                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3861                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862                         if (!cmd)
3863                                 goto reject;
3864                 }
3865                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3866                 break;
3867         case ISCSI_OP_SCSI_TMFUNC:
3868                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3869                 if (!cmd)
3870                         goto reject;
3871
3872                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3873                 break;
3874         case ISCSI_OP_TEXT:
3875                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3876                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3877                         if (!cmd)
3878                                 goto reject;
3879                 } else {
3880                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881                         if (!cmd)
3882                                 goto reject;
3883                 }
3884
3885                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3886                 break;
3887         case ISCSI_OP_LOGOUT:
3888                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889                 if (!cmd)
3890                         goto reject;
3891
3892                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3893                 if (ret > 0)
3894                         wait_for_completion_timeout(&conn->conn_logout_comp,
3895                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3896                 break;
3897         case ISCSI_OP_SNACK:
3898                 ret = iscsit_handle_snack(conn, buf);
3899                 break;
3900         default:
3901                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3902                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3903                         pr_err("Cannot recover from unknown"
3904                         " opcode while ERL=0, closing iSCSI connection.\n");
3905                         return -1;
3906                 }
3907                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3908                        " closing iSCSI connection.\n");
3909                 ret = -1;
3910                 break;
3911         }
3912
3913         return ret;
3914 reject:
3915         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3916 }
3917
3918 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3919 {
3920         bool ret;
3921
3922         spin_lock_bh(&conn->state_lock);
3923         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3924         spin_unlock_bh(&conn->state_lock);
3925
3926         return ret;
3927 }
3928
3929 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3930 {
3931         int ret;
3932         u8 buffer[ISCSI_HDR_LEN], opcode;
3933         u32 checksum = 0, digest = 0;
3934         struct kvec iov;
3935
3936         while (!kthread_should_stop()) {
3937                 /*
3938                  * Ensure that both TX and RX per connection kthreads
3939                  * are scheduled to run on the same CPU.
3940                  */
3941                 iscsit_thread_check_cpumask(conn, current, 0);
3942
3943                 memset(buffer, 0, ISCSI_HDR_LEN);
3944                 memset(&iov, 0, sizeof(struct kvec));
3945
3946                 iov.iov_base    = buffer;
3947                 iov.iov_len     = ISCSI_HDR_LEN;
3948
3949                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3950                 if (ret != ISCSI_HDR_LEN) {
3951                         iscsit_rx_thread_wait_for_tcp(conn);
3952                         return;
3953                 }
3954
3955                 if (conn->conn_ops->HeaderDigest) {
3956                         iov.iov_base    = &digest;
3957                         iov.iov_len     = ISCSI_CRC_LEN;
3958
3959                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3960                         if (ret != ISCSI_CRC_LEN) {
3961                                 iscsit_rx_thread_wait_for_tcp(conn);
3962                                 return;
3963                         }
3964
3965                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3966                                         buffer, ISCSI_HDR_LEN,
3967                                         0, NULL, (u8 *)&checksum);
3968
3969                         if (digest != checksum) {
3970                                 pr_err("HeaderDigest CRC32C failed,"
3971                                         " received 0x%08x, computed 0x%08x\n",
3972                                         digest, checksum);
3973                                 /*
3974                                  * Set the PDU to 0xff so it will intentionally
3975                                  * hit default in the switch below.
3976                                  */
3977                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3978                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3979                         } else {
3980                                 pr_debug("Got HeaderDigest CRC32C"
3981                                                 " 0x%08x\n", checksum);
3982                         }
3983                 }
3984
3985                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3986                         return;
3987
3988                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3989
3990                 if (conn->sess->sess_ops->SessionType &&
3991                    ((!(opcode & ISCSI_OP_TEXT)) ||
3992                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3993                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3994                         " while in Discovery Session, rejecting.\n", opcode);
3995                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
3996                                           buffer);
3997                         return;
3998                 }
3999
4000                 ret = iscsi_target_rx_opcode(conn, buffer);
4001                 if (ret < 0)
4002                         return;
4003         }
4004 }
4005
4006 int iscsi_target_rx_thread(void *arg)
4007 {
4008         int rc;
4009         struct iscsi_conn *conn = arg;
4010
4011         /*
4012          * Allow ourselves to be interrupted by SIGINT so that a
4013          * connection recovery / failure event can be triggered externally.
4014          */
4015         allow_signal(SIGINT);
4016         /*
4017          * Wait for iscsi_post_login_handler() to complete before allowing
4018          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4019          */
4020         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4021         if (rc < 0 || iscsi_target_check_conn_state(conn))
4022                 return 0;
4023
4024         if (!conn->conn_transport->iscsit_get_rx_pdu)
4025                 return 0;
4026
4027         conn->conn_transport->iscsit_get_rx_pdu(conn);
4028
4029         if (!signal_pending(current))
4030                 atomic_set(&conn->transport_failed, 1);
4031         iscsit_take_action_for_connection_exit(conn);
4032         return 0;
4033 }
4034
4035 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4036 {
4037         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4038         struct iscsi_session *sess = conn->sess;
4039         /*
4040          * We expect this function to only ever be called from either RX or TX
4041          * thread context via iscsit_close_connection() once the other context
4042          * has been reset -> returned sleeping pre-handler state.
4043          */
4044         spin_lock_bh(&conn->cmd_lock);
4045         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4046
4047                 list_del_init(&cmd->i_conn_node);
4048                 spin_unlock_bh(&conn->cmd_lock);
4049
4050                 iscsit_increment_maxcmdsn(cmd, sess);
4051
4052                 iscsit_free_cmd(cmd, true);
4053
4054                 spin_lock_bh(&conn->cmd_lock);
4055         }
4056         spin_unlock_bh(&conn->cmd_lock);
4057 }
4058
4059 static void iscsit_stop_timers_for_cmds(
4060         struct iscsi_conn *conn)
4061 {
4062         struct iscsi_cmd *cmd;
4063
4064         spin_lock_bh(&conn->cmd_lock);
4065         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4066                 if (cmd->data_direction == DMA_TO_DEVICE)
4067                         iscsit_stop_dataout_timer(cmd);
4068         }
4069         spin_unlock_bh(&conn->cmd_lock);
4070 }
4071
4072 int iscsit_close_connection(
4073         struct iscsi_conn *conn)
4074 {
4075         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4076         struct iscsi_session    *sess = conn->sess;
4077
4078         pr_debug("Closing iSCSI connection CID %hu on SID:"
4079                 " %u\n", conn->cid, sess->sid);
4080         /*
4081          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4082          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4083          * sleeping and the logout response never got sent because the
4084          * connection failed.
4085          *
4086          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4087          * to signal logout response TX interrupt completion.  Go ahead and skip
4088          * this for iser since isert_rx_opcode() does not wait on logout failure,
4089          * and to avoid iscsi_conn pointer dereference in iser-target code.
4090          */
4091         if (!conn->conn_transport->rdma_shutdown)
4092                 complete(&conn->conn_logout_comp);
4093
4094         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4095                 if (conn->tx_thread &&
4096                     cmpxchg(&conn->tx_thread_active, true, false)) {
4097                         send_sig(SIGINT, conn->tx_thread, 1);
4098                         kthread_stop(conn->tx_thread);
4099                 }
4100         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4101                 if (conn->rx_thread &&
4102                     cmpxchg(&conn->rx_thread_active, true, false)) {
4103                         send_sig(SIGINT, conn->rx_thread, 1);
4104                         kthread_stop(conn->rx_thread);
4105                 }
4106         }
4107
4108         spin_lock(&iscsit_global->ts_bitmap_lock);
4109         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4110                               get_order(1));
4111         spin_unlock(&iscsit_global->ts_bitmap_lock);
4112
4113         iscsit_stop_timers_for_cmds(conn);
4114         iscsit_stop_nopin_response_timer(conn);
4115         iscsit_stop_nopin_timer(conn);
4116
4117         if (conn->conn_transport->iscsit_wait_conn)
4118                 conn->conn_transport->iscsit_wait_conn(conn);
4119
4120         /*
4121          * During Connection recovery drop unacknowledged out of order
4122          * commands for this connection, and prepare the other commands
4123          * for realligence.
4124          *
4125          * During normal operation clear the out of order commands (but
4126          * do not free the struct iscsi_ooo_cmdsn's) and release all
4127          * struct iscsi_cmds.
4128          */
4129         if (atomic_read(&conn->connection_recovery)) {
4130                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4131                 iscsit_prepare_cmds_for_realligance(conn);
4132         } else {
4133                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4134                 iscsit_release_commands_from_conn(conn);
4135         }
4136         iscsit_free_queue_reqs_for_conn(conn);
4137
4138         /*
4139          * Handle decrementing session or connection usage count if
4140          * a logout response was not able to be sent because the
4141          * connection failed.  Fall back to Session Recovery here.
4142          */
4143         if (atomic_read(&conn->conn_logout_remove)) {
4144                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4145                         iscsit_dec_conn_usage_count(conn);
4146                         iscsit_dec_session_usage_count(sess);
4147                 }
4148                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4149                         iscsit_dec_conn_usage_count(conn);
4150
4151                 atomic_set(&conn->conn_logout_remove, 0);
4152                 atomic_set(&sess->session_reinstatement, 0);
4153                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4154         }
4155
4156         spin_lock_bh(&sess->conn_lock);
4157         list_del(&conn->conn_list);
4158
4159         /*
4160          * Attempt to let the Initiator know this connection failed by
4161          * sending an Connection Dropped Async Message on another
4162          * active connection.
4163          */
4164         if (atomic_read(&conn->connection_recovery))
4165                 iscsit_build_conn_drop_async_message(conn);
4166
4167         spin_unlock_bh(&sess->conn_lock);
4168
4169         /*
4170          * If connection reinstatement is being performed on this connection,
4171          * up the connection reinstatement semaphore that is being blocked on
4172          * in iscsit_cause_connection_reinstatement().
4173          */
4174         spin_lock_bh(&conn->state_lock);
4175         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4176                 spin_unlock_bh(&conn->state_lock);
4177                 complete(&conn->conn_wait_comp);
4178                 wait_for_completion(&conn->conn_post_wait_comp);
4179                 spin_lock_bh(&conn->state_lock);
4180         }
4181
4182         /*
4183          * If connection reinstatement is being performed on this connection
4184          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4185          * connection wait rcfr semaphore that is being blocked on
4186          * an iscsit_connection_reinstatement_rcfr().
4187          */
4188         if (atomic_read(&conn->connection_wait_rcfr)) {
4189                 spin_unlock_bh(&conn->state_lock);
4190                 complete(&conn->conn_wait_rcfr_comp);
4191                 wait_for_completion(&conn->conn_post_wait_comp);
4192                 spin_lock_bh(&conn->state_lock);
4193         }
4194         atomic_set(&conn->connection_reinstatement, 1);
4195         spin_unlock_bh(&conn->state_lock);
4196
4197         /*
4198          * If any other processes are accessing this connection pointer we
4199          * must wait until they have completed.
4200          */
4201         iscsit_check_conn_usage_count(conn);
4202
4203         ahash_request_free(conn->conn_tx_hash);
4204         if (conn->conn_rx_hash) {
4205                 struct crypto_ahash *tfm;
4206
4207                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4208                 ahash_request_free(conn->conn_rx_hash);
4209                 crypto_free_ahash(tfm);
4210         }
4211
4212         free_cpumask_var(conn->conn_cpumask);
4213
4214         kfree(conn->conn_ops);
4215         conn->conn_ops = NULL;
4216
4217         if (conn->sock)
4218                 sock_release(conn->sock);
4219
4220         if (conn->conn_transport->iscsit_free_conn)
4221                 conn->conn_transport->iscsit_free_conn(conn);
4222
4223         iscsit_put_transport(conn->conn_transport);
4224
4225         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4226         conn->conn_state = TARG_CONN_STATE_FREE;
4227         kfree(conn);
4228
4229         spin_lock_bh(&sess->conn_lock);
4230         atomic_dec(&sess->nconn);
4231         pr_debug("Decremented iSCSI connection count to %hu from node:"
4232                 " %s\n", atomic_read(&sess->nconn),
4233                 sess->sess_ops->InitiatorName);
4234         /*
4235          * Make sure that if one connection fails in an non ERL=2 iSCSI
4236          * Session that they all fail.
4237          */
4238         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4239              !atomic_read(&sess->session_logout))
4240                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4241
4242         /*
4243          * If this was not the last connection in the session, and we are
4244          * performing session reinstatement or falling back to ERL=0, call
4245          * iscsit_stop_session() without sleeping to shutdown the other
4246          * active connections.
4247          */
4248         if (atomic_read(&sess->nconn)) {
4249                 if (!atomic_read(&sess->session_reinstatement) &&
4250                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4251                         spin_unlock_bh(&sess->conn_lock);
4252                         return 0;
4253                 }
4254                 if (!atomic_read(&sess->session_stop_active)) {
4255                         atomic_set(&sess->session_stop_active, 1);
4256                         spin_unlock_bh(&sess->conn_lock);
4257                         iscsit_stop_session(sess, 0, 0);
4258                         return 0;
4259                 }
4260                 spin_unlock_bh(&sess->conn_lock);
4261                 return 0;
4262         }
4263
4264         /*
4265          * If this was the last connection in the session and one of the
4266          * following is occurring:
4267          *
4268          * Session Reinstatement is not being performed, and are falling back
4269          * to ERL=0 call iscsit_close_session().
4270          *
4271          * Session Logout was requested.  iscsit_close_session() will be called
4272          * elsewhere.
4273          *
4274          * Session Continuation is not being performed, start the Time2Retain
4275          * handler and check if sleep_on_sess_wait_sem is active.
4276          */
4277         if (!atomic_read(&sess->session_reinstatement) &&
4278              atomic_read(&sess->session_fall_back_to_erl0)) {
4279                 spin_unlock_bh(&sess->conn_lock);
4280                 iscsit_close_session(sess);
4281
4282                 return 0;
4283         } else if (atomic_read(&sess->session_logout)) {
4284                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4285                 sess->session_state = TARG_SESS_STATE_FREE;
4286                 spin_unlock_bh(&sess->conn_lock);
4287
4288                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4289                         complete(&sess->session_wait_comp);
4290
4291                 return 0;
4292         } else {
4293                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4294                 sess->session_state = TARG_SESS_STATE_FAILED;
4295
4296                 if (!atomic_read(&sess->session_continuation)) {
4297                         spin_unlock_bh(&sess->conn_lock);
4298                         iscsit_start_time2retain_handler(sess);
4299                 } else
4300                         spin_unlock_bh(&sess->conn_lock);
4301
4302                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4303                         complete(&sess->session_wait_comp);
4304
4305                 return 0;
4306         }
4307 }
4308
4309 /*
4310  * If the iSCSI Session for the iSCSI Initiator Node exists,
4311  * forcefully shutdown the iSCSI NEXUS.
4312  */
4313 int iscsit_close_session(struct iscsi_session *sess)
4314 {
4315         struct iscsi_portal_group *tpg = sess->tpg;
4316         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4317
4318         if (atomic_read(&sess->nconn)) {
4319                 pr_err("%d connection(s) still exist for iSCSI session"
4320                         " to %s\n", atomic_read(&sess->nconn),
4321                         sess->sess_ops->InitiatorName);
4322                 BUG();
4323         }
4324
4325         spin_lock_bh(&se_tpg->session_lock);
4326         atomic_set(&sess->session_logout, 1);
4327         atomic_set(&sess->session_reinstatement, 1);
4328         iscsit_stop_time2retain_timer(sess);
4329         spin_unlock_bh(&se_tpg->session_lock);
4330
4331         /*
4332          * transport_deregister_session_configfs() will clear the
4333          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4334          * can be setting it again with __transport_register_session() in
4335          * iscsi_post_login_handler() again after the iscsit_stop_session()
4336          * completes in iscsi_np context.
4337          */
4338         transport_deregister_session_configfs(sess->se_sess);
4339
4340         /*
4341          * If any other processes are accessing this session pointer we must
4342          * wait until they have completed.  If we are in an interrupt (the
4343          * time2retain handler) and contain and active session usage count we
4344          * restart the timer and exit.
4345          */
4346         if (!in_interrupt()) {
4347                 if (iscsit_check_session_usage_count(sess) == 1)
4348                         iscsit_stop_session(sess, 1, 1);
4349         } else {
4350                 if (iscsit_check_session_usage_count(sess) == 2) {
4351                         atomic_set(&sess->session_logout, 0);
4352                         iscsit_start_time2retain_handler(sess);
4353                         return 0;
4354                 }
4355         }
4356
4357         transport_deregister_session(sess->se_sess);
4358
4359         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4360                 iscsit_free_connection_recovery_entires(sess);
4361
4362         iscsit_free_all_ooo_cmdsns(sess);
4363
4364         spin_lock_bh(&se_tpg->session_lock);
4365         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4366         sess->session_state = TARG_SESS_STATE_FREE;
4367         pr_debug("Released iSCSI session from node: %s\n",
4368                         sess->sess_ops->InitiatorName);
4369         tpg->nsessions--;
4370         if (tpg->tpg_tiqn)
4371                 tpg->tpg_tiqn->tiqn_nsessions--;
4372
4373         pr_debug("Decremented number of active iSCSI Sessions on"
4374                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4375
4376         spin_lock(&sess_idr_lock);
4377         idr_remove(&sess_idr, sess->session_index);
4378         spin_unlock(&sess_idr_lock);
4379
4380         kfree(sess->sess_ops);
4381         sess->sess_ops = NULL;
4382         spin_unlock_bh(&se_tpg->session_lock);
4383
4384         kfree(sess);
4385         return 0;
4386 }
4387
4388 static void iscsit_logout_post_handler_closesession(
4389         struct iscsi_conn *conn)
4390 {
4391         struct iscsi_session *sess = conn->sess;
4392         int sleep = 1;
4393         /*
4394          * Traditional iscsi/tcp will invoke this logic from TX thread
4395          * context during session logout, so clear tx_thread_active and
4396          * sleep if iscsit_close_connection() has not already occured.
4397          *
4398          * Since iser-target invokes this logic from it's own workqueue,
4399          * always sleep waiting for RX/TX thread shutdown to complete
4400          * within iscsit_close_connection().
4401          */
4402         if (!conn->conn_transport->rdma_shutdown)
4403                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4404
4405         atomic_set(&conn->conn_logout_remove, 0);
4406         complete(&conn->conn_logout_comp);
4407
4408         iscsit_dec_conn_usage_count(conn);
4409         iscsit_stop_session(sess, sleep, sleep);
4410         iscsit_dec_session_usage_count(sess);
4411         iscsit_close_session(sess);
4412 }
4413
4414 static void iscsit_logout_post_handler_samecid(
4415         struct iscsi_conn *conn)
4416 {
4417         int sleep = 1;
4418
4419         if (!conn->conn_transport->rdma_shutdown)
4420                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4421
4422         atomic_set(&conn->conn_logout_remove, 0);
4423         complete(&conn->conn_logout_comp);
4424
4425         iscsit_cause_connection_reinstatement(conn, sleep);
4426         iscsit_dec_conn_usage_count(conn);
4427 }
4428
4429 static void iscsit_logout_post_handler_diffcid(
4430         struct iscsi_conn *conn,
4431         u16 cid)
4432 {
4433         struct iscsi_conn *l_conn;
4434         struct iscsi_session *sess = conn->sess;
4435         bool conn_found = false;
4436
4437         if (!sess)
4438                 return;
4439
4440         spin_lock_bh(&sess->conn_lock);
4441         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4442                 if (l_conn->cid == cid) {
4443                         iscsit_inc_conn_usage_count(l_conn);
4444                         conn_found = true;
4445                         break;
4446                 }
4447         }
4448         spin_unlock_bh(&sess->conn_lock);
4449
4450         if (!conn_found)
4451                 return;
4452
4453         if (l_conn->sock)
4454                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4455
4456         spin_lock_bh(&l_conn->state_lock);
4457         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4458         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4459         spin_unlock_bh(&l_conn->state_lock);
4460
4461         iscsit_cause_connection_reinstatement(l_conn, 1);
4462         iscsit_dec_conn_usage_count(l_conn);
4463 }
4464
4465 /*
4466  *      Return of 0 causes the TX thread to restart.
4467  */
4468 int iscsit_logout_post_handler(
4469         struct iscsi_cmd *cmd,
4470         struct iscsi_conn *conn)
4471 {
4472         int ret = 0;
4473
4474         switch (cmd->logout_reason) {
4475         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4476                 switch (cmd->logout_response) {
4477                 case ISCSI_LOGOUT_SUCCESS:
4478                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4479                 default:
4480                         iscsit_logout_post_handler_closesession(conn);
4481                         break;
4482                 }
4483                 ret = 0;
4484                 break;
4485         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4486                 if (conn->cid == cmd->logout_cid) {
4487                         switch (cmd->logout_response) {
4488                         case ISCSI_LOGOUT_SUCCESS:
4489                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4490                         default:
4491                                 iscsit_logout_post_handler_samecid(conn);
4492                                 break;
4493                         }
4494                         ret = 0;
4495                 } else {
4496                         switch (cmd->logout_response) {
4497                         case ISCSI_LOGOUT_SUCCESS:
4498                                 iscsit_logout_post_handler_diffcid(conn,
4499                                         cmd->logout_cid);
4500                                 break;
4501                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4502                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4503                         default:
4504                                 break;
4505                         }
4506                         ret = 1;
4507                 }
4508                 break;
4509         case ISCSI_LOGOUT_REASON_RECOVERY:
4510                 switch (cmd->logout_response) {
4511                 case ISCSI_LOGOUT_SUCCESS:
4512                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4513                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4514                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4515                 default:
4516                         break;
4517                 }
4518                 ret = 1;
4519                 break;
4520         default:
4521                 break;
4522
4523         }
4524         return ret;
4525 }
4526 EXPORT_SYMBOL(iscsit_logout_post_handler);
4527
4528 void iscsit_fail_session(struct iscsi_session *sess)
4529 {
4530         struct iscsi_conn *conn;
4531
4532         spin_lock_bh(&sess->conn_lock);
4533         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4534                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4535                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4536         }
4537         spin_unlock_bh(&sess->conn_lock);
4538
4539         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4540         sess->session_state = TARG_SESS_STATE_FAILED;
4541 }
4542
4543 int iscsit_free_session(struct iscsi_session *sess)
4544 {
4545         u16 conn_count = atomic_read(&sess->nconn);
4546         struct iscsi_conn *conn, *conn_tmp = NULL;
4547         int is_last;
4548
4549         spin_lock_bh(&sess->conn_lock);
4550         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4551
4552         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4553                         conn_list) {
4554                 if (conn_count == 0)
4555                         break;
4556
4557                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4558                         is_last = 1;
4559                 } else {
4560                         iscsit_inc_conn_usage_count(conn_tmp);
4561                         is_last = 0;
4562                 }
4563                 iscsit_inc_conn_usage_count(conn);
4564
4565                 spin_unlock_bh(&sess->conn_lock);
4566                 iscsit_cause_connection_reinstatement(conn, 1);
4567                 spin_lock_bh(&sess->conn_lock);
4568
4569                 iscsit_dec_conn_usage_count(conn);
4570                 if (is_last == 0)
4571                         iscsit_dec_conn_usage_count(conn_tmp);
4572
4573                 conn_count--;
4574         }
4575
4576         if (atomic_read(&sess->nconn)) {
4577                 spin_unlock_bh(&sess->conn_lock);
4578                 wait_for_completion(&sess->session_wait_comp);
4579         } else
4580                 spin_unlock_bh(&sess->conn_lock);
4581
4582         iscsit_close_session(sess);
4583         return 0;
4584 }
4585
4586 void iscsit_stop_session(
4587         struct iscsi_session *sess,
4588         int session_sleep,
4589         int connection_sleep)
4590 {
4591         u16 conn_count = atomic_read(&sess->nconn);
4592         struct iscsi_conn *conn, *conn_tmp = NULL;
4593         int is_last;
4594
4595         spin_lock_bh(&sess->conn_lock);
4596         if (session_sleep)
4597                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4598
4599         if (connection_sleep) {
4600                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4601                                 conn_list) {
4602                         if (conn_count == 0)
4603                                 break;
4604
4605                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4606                                 is_last = 1;
4607                         } else {
4608                                 iscsit_inc_conn_usage_count(conn_tmp);
4609                                 is_last = 0;
4610                         }
4611                         iscsit_inc_conn_usage_count(conn);
4612
4613                         spin_unlock_bh(&sess->conn_lock);
4614                         iscsit_cause_connection_reinstatement(conn, 1);
4615                         spin_lock_bh(&sess->conn_lock);
4616
4617                         iscsit_dec_conn_usage_count(conn);
4618                         if (is_last == 0)
4619                                 iscsit_dec_conn_usage_count(conn_tmp);
4620                         conn_count--;
4621                 }
4622         } else {
4623                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4624                         iscsit_cause_connection_reinstatement(conn, 0);
4625         }
4626
4627         if (session_sleep && atomic_read(&sess->nconn)) {
4628                 spin_unlock_bh(&sess->conn_lock);
4629                 wait_for_completion(&sess->session_wait_comp);
4630         } else
4631                 spin_unlock_bh(&sess->conn_lock);
4632 }
4633
4634 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4635 {
4636         struct iscsi_session *sess;
4637         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4638         struct se_session *se_sess, *se_sess_tmp;
4639         LIST_HEAD(free_list);
4640         int session_count = 0;
4641
4642         spin_lock_bh(&se_tpg->session_lock);
4643         if (tpg->nsessions && !force) {
4644                 spin_unlock_bh(&se_tpg->session_lock);
4645                 return -1;
4646         }
4647
4648         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4649                         sess_list) {
4650                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4651
4652                 spin_lock(&sess->conn_lock);
4653                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4654                     atomic_read(&sess->session_logout) ||
4655                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4656                         spin_unlock(&sess->conn_lock);
4657                         continue;
4658                 }
4659                 atomic_set(&sess->session_reinstatement, 1);
4660                 spin_unlock(&sess->conn_lock);
4661
4662                 list_move_tail(&se_sess->sess_list, &free_list);
4663         }
4664         spin_unlock_bh(&se_tpg->session_lock);
4665
4666         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4667                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4668
4669                 iscsit_free_session(sess);
4670                 session_count++;
4671         }
4672
4673         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4674                         " Group: %hu\n", session_count, tpg->tpgt);
4675         return 0;
4676 }
4677
4678 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4679 MODULE_VERSION("4.1.x");
4680 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4681 MODULE_LICENSE("GPL");
4682
4683 module_init(iscsi_target_init_module);
4684 module_exit(iscsi_target_cleanup_module);