drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <crypto/hash.h>
  20 #include <linux/string.h>
  21 #include <linux/kthread.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <linux/delay.h>
  27 #include <linux/sched/signal.h>
  28 #include <asm/unaligned.h>
  29 #include <net/ipv6.h>
  30 #include <scsi/scsi_proto.h>
  31 #include <scsi/iscsi_proto.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <target/target_core_base.h>
  34 #include <target/target_core_fabric.h>
  35
  36 #include <target/iscsi/iscsi_target_core.h>
  37 #include "iscsi_target_parameters.h"
  38 #include "iscsi_target_seq_pdu_list.h"
  39 #include "iscsi_target_datain_values.h"
  40 #include "iscsi_target_erl0.h"
  41 #include "iscsi_target_erl1.h"
  42 #include "iscsi_target_erl2.h"
  43 #include "iscsi_target_login.h"
  44 #include "iscsi_target_tmr.h"
  45 #include "iscsi_target_tpg.h"
  46 #include "iscsi_target_util.h"
  47 #include "iscsi_target.h"
  48 #include "iscsi_target_device.h"
  49 #include <target/iscsi/iscsi_target_stat.h>
  50
  51 #include <target/iscsi/iscsi_transport.h>
  52
  53 static LIST_HEAD(g_tiqn_list);
  54 static LIST_HEAD(g_np_list);
  55 static DEFINE_SPINLOCK(tiqn_lock);
  56 static DEFINE_MUTEX(np_lock);
  57
  58 static struct idr tiqn_idr;
  59 struct idr sess_idr;
  60 struct mutex auth_id_lock;
  61 spinlock_t sess_idr_lock;
  62
  63 struct iscsit_global *iscsit_global;
  64
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         struct iscsi_scsi_req *, u32);
  72
  73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  74 {
  75         struct iscsi_tiqn *tiqn = NULL;
  76
  77         spin_lock(&tiqn_lock);
  78         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  79                 if (!strcmp(tiqn->tiqn, buf)) {
  80
  81                         spin_lock(&tiqn->tiqn_state_lock);
  82                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  83                                 tiqn->tiqn_access_count++;
  84                                 spin_unlock(&tiqn->tiqn_state_lock);
  85                                 spin_unlock(&tiqn_lock);
  86                                 return tiqn;
  87                         }
  88                         spin_unlock(&tiqn->tiqn_state_lock);
  89                 }
  90         }
  91         spin_unlock(&tiqn_lock);
  92
  93         return NULL;
  94 }
  95
  96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  97 {
  98         spin_lock(&tiqn->tiqn_state_lock);
  99         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 100                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 101                 spin_unlock(&tiqn->tiqn_state_lock);
 102                 return 0;
 103         }
 104         spin_unlock(&tiqn->tiqn_state_lock);
 105
 106         return -1;
 107 }
 108
 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 110 {
 111         spin_lock(&tiqn->tiqn_state_lock);
 112         tiqn->tiqn_access_count--;
 113         spin_unlock(&tiqn->tiqn_state_lock);
 114 }
 115
 116 /*
 117  * Note that IQN formatting is expected to be done in userspace, and
 118  * no explict IQN format checks are done here.
 119  */
 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 121 {
 122         struct iscsi_tiqn *tiqn = NULL;
 123         int ret;
 124
 125         if (strlen(buf) >= ISCSI_IQN_LEN) {
 126                 pr_err("Target IQN exceeds %d bytes\n",
 127                                 ISCSI_IQN_LEN);
 128                 return ERR_PTR(-EINVAL);
 129         }
 130
 131         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 132         if (!tiqn)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 145
 146         idr_preload(GFP_KERNEL);
 147         spin_lock(&tiqn_lock);
 148
 149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 150         if (ret < 0) {
 151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 152                 spin_unlock(&tiqn_lock);
 153                 idr_preload_end();
 154                 kfree(tiqn);
 155                 return ERR_PTR(ret);
 156         }
 157         tiqn->tiqn_index = ret;
 158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 159
 160         spin_unlock(&tiqn_lock);
 161         idr_preload_end();
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         spin_unlock_bh(&np->np_thread_lock);
 220         /*
 221          * Determine if the portal group is accepting storage traffic.
 222          */
 223         spin_lock_bh(&tpg->tpg_state_lock);
 224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 225                 spin_unlock_bh(&tpg->tpg_state_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&tpg->tpg_state_lock);
 229
 230         /*
 231          * Here we serialize access across the TIQN+TPG Tuple.
 232          */
 233         ret = down_interruptible(&tpg->np_login_sem);
 234         if (ret != 0)
 235                 return -1;
 236
 237         spin_lock_bh(&tpg->tpg_state_lock);
 238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 239                 spin_unlock_bh(&tpg->tpg_state_lock);
 240                 up(&tpg->np_login_sem);
 241                 return -1;
 242         }
 243         spin_unlock_bh(&tpg->tpg_state_lock);
 244
 245         return 0;
 246 }
 247
 248 void iscsit_login_kref_put(struct kref *kref)
 249 {
 250         struct iscsi_tpg_np *tpg_np = container_of(kref,
 251                                 struct iscsi_tpg_np, tpg_np_kref);
 252
 253         complete(&tpg_np->tpg_np_comp);
 254 }
 255
 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 257                        struct iscsi_tpg_np *tpg_np)
 258 {
 259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 260
 261         up(&tpg->np_login_sem);
 262
 263         if (tpg_np)
 264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 265
 266         if (tiqn)
 267                 iscsit_put_tiqn_for_login(tiqn);
 268
 269         return 0;
 270 }
 271
 272 bool iscsit_check_np_match(
 273         struct sockaddr_storage *sockaddr,
 274         struct iscsi_np *np,
 275         int network_transport)
 276 {
 277         struct sockaddr_in *sock_in, *sock_in_e;
 278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 279         bool ip_match = false;
 280         u16 port, port_e;
 281
 282         if (sockaddr->ss_family == AF_INET6) {
 283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                             &sock_in6_e->sin6_addr.in6_u,
 288                             sizeof(struct in6_addr)))
 289                         ip_match = true;
 290
 291                 port = ntohs(sock_in6->sin6_port);
 292                 port_e = ntohs(sock_in6_e->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301                 port_e = ntohs(sock_in_e->sin_port);
 302         }
 303
 304         if (ip_match && (port_e == port) &&
 305             (np->np_network_transport == network_transport))
 306                 return true;
 307
 308         return false;
 309 }
 310
 311 /*
 312  * Called with mutex np_lock held
 313  */
 314 static struct iscsi_np *iscsit_get_np(
 315         struct sockaddr_storage *sockaddr,
 316         int network_transport)
 317 {
 318         struct iscsi_np *np;
 319         bool match;
 320
 321         list_for_each_entry(np, &g_np_list, np_list) {
 322                 spin_lock_bh(&np->np_thread_lock);
 323                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 324                         spin_unlock_bh(&np->np_thread_lock);
 325                         continue;
 326                 }
 327
 328                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 329                 if (match) {
 330                         /*
 331                          * Increment the np_exports reference count now to
 332                          * prevent iscsit_del_np() below from being called
 333                          * while iscsi_tpg_add_network_portal() is called.
 334                          */
 335                         np->np_exports++;
 336                         spin_unlock_bh(&np->np_thread_lock);
 337                         return np;
 338                 }
 339                 spin_unlock_bh(&np->np_thread_lock);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 struct iscsi_np *iscsit_add_np(
 346         struct sockaddr_storage *sockaddr,
 347         int network_transport)
 348 {
 349         struct iscsi_np *np;
 350         int ret;
 351
 352         mutex_lock(&np_lock);
 353
 354         /*
 355          * Locate the existing struct iscsi_np if already active..
 356          */
 357         np = iscsit_get_np(sockaddr, network_transport);
 358         if (np) {
 359                 mutex_unlock(&np_lock);
 360                 return np;
 361         }
 362
 363         np = kzalloc(sizeof(*np), GFP_KERNEL);
 364         if (!np) {
 365                 mutex_unlock(&np_lock);
 366                 return ERR_PTR(-ENOMEM);
 367         }
 368
 369         np->np_flags |= NPF_IP_NETWORK;
 370         np->np_network_transport = network_transport;
 371         spin_lock_init(&np->np_thread_lock);
 372         init_completion(&np->np_restart_comp);
 373         INIT_LIST_HEAD(&np->np_list);
 374
 375         ret = iscsi_target_setup_login_socket(np, sockaddr);
 376         if (ret != 0) {
 377                 kfree(np);
 378                 mutex_unlock(&np_lock);
 379                 return ERR_PTR(ret);
 380         }
 381
 382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 383         if (IS_ERR(np->np_thread)) {
 384                 pr_err("Unable to create kthread: iscsi_np\n");
 385                 ret = PTR_ERR(np->np_thread);
 386                 kfree(np);
 387                 mutex_unlock(&np_lock);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 399
 400         list_add_tail(&np->np_list, &g_np_list);
 401         mutex_unlock(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 404                 &np->np_sockaddr, np->np_transport->name);
 405
 406         return np;
 407 }
 408
 409 int iscsit_reset_np_thread(
 410         struct iscsi_np *np,
 411         struct iscsi_tpg_np *tpg_np,
 412         struct iscsi_portal_group *tpg,
 413         bool shutdown)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 return 0;
 419         }
 420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 421
 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         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 486 }
 487 EXPORT_SYMBOL(iscsit_queue_rsp);
 488
 489 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 490 {
 491         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 492
 493         spin_lock_bh(&conn->cmd_lock);
 494         if (!list_empty(&cmd->i_conn_node) &&
 495             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 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         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 697         if (!iscsit_global)
 698                 return -1;
 699
 700         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 701         mutex_init(&auth_id_lock);
 702         spin_lock_init(&sess_idr_lock);
 703         idr_init(&tiqn_idr);
 704         idr_init(&sess_idr);
 705
 706         ret = target_register_template(&iscsi_ops);
 707         if (ret)
 708                 goto out;
 709
 710         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 711         iscsit_global->ts_bitmap = vzalloc(size);
 712         if (!iscsit_global->ts_bitmap)
 713                 goto configfs_out;
 714
 715         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 716                         sizeof(struct iscsi_queue_req),
 717                         __alignof__(struct iscsi_queue_req), 0, NULL);
 718         if (!lio_qr_cache) {
 719                 pr_err("nable to kmem_cache_create() for"
 720                                 " lio_qr_cache\n");
 721                 goto bitmap_out;
 722         }
 723
 724         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 725                         sizeof(struct iscsi_datain_req),
 726                         __alignof__(struct iscsi_datain_req), 0, NULL);
 727         if (!lio_dr_cache) {
 728                 pr_err("Unable to kmem_cache_create() for"
 729                                 " lio_dr_cache\n");
 730                 goto qr_out;
 731         }
 732
 733         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 734                         sizeof(struct iscsi_ooo_cmdsn),
 735                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 736         if (!lio_ooo_cache) {
 737                 pr_err("Unable to kmem_cache_create() for"
 738                                 " lio_ooo_cache\n");
 739                 goto dr_out;
 740         }
 741
 742         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 743                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 744                         0, NULL);
 745         if (!lio_r2t_cache) {
 746                 pr_err("Unable to kmem_cache_create() for"
 747                                 " lio_r2t_cache\n");
 748                 goto ooo_out;
 749         }
 750
 751         iscsit_register_transport(&iscsi_target_transport);
 752
 753         if (iscsit_load_discovery_tpg() < 0)
 754                 goto r2t_out;
 755
 756         return ret;
 757 r2t_out:
 758         iscsit_unregister_transport(&iscsi_target_transport);
 759         kmem_cache_destroy(lio_r2t_cache);
 760 ooo_out:
 761         kmem_cache_destroy(lio_ooo_cache);
 762 dr_out:
 763         kmem_cache_destroy(lio_dr_cache);
 764 qr_out:
 765         kmem_cache_destroy(lio_qr_cache);
 766 bitmap_out:
 767         vfree(iscsit_global->ts_bitmap);
 768 configfs_out:
 769         /* XXX: this probably wants it to be it's own unwind step.. */
 770         if (iscsit_global->discovery_tpg)
 771                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 772         target_unregister_template(&iscsi_ops);
 773 out:
 774         kfree(iscsit_global);
 775         return -ENOMEM;
 776 }
 777
 778 static void __exit iscsi_target_cleanup_module(void)
 779 {
 780         iscsit_release_discovery_tpg();
 781         iscsit_unregister_transport(&iscsi_target_transport);
 782         kmem_cache_destroy(lio_qr_cache);
 783         kmem_cache_destroy(lio_dr_cache);
 784         kmem_cache_destroy(lio_ooo_cache);
 785         kmem_cache_destroy(lio_r2t_cache);
 786
 787         /*
 788          * Shutdown discovery sessions and disable discovery TPG
 789          */
 790         if (iscsit_global->discovery_tpg)
 791                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 792
 793         target_unregister_template(&iscsi_ops);
 794
 795         vfree(iscsit_global->ts_bitmap);
 796         kfree(iscsit_global);
 797 }
 798
 799 int iscsit_add_reject(
 800         struct iscsi_conn *conn,
 801         u8 reason,
 802         unsigned char *buf)
 803 {
 804         struct iscsi_cmd *cmd;
 805
 806         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 807         if (!cmd)
 808                 return -1;
 809
 810         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 811         cmd->reject_reason = reason;
 812
 813         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 814         if (!cmd->buf_ptr) {
 815                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 816                 iscsit_free_cmd(cmd, false);
 817                 return -1;
 818         }
 819
 820         spin_lock_bh(&conn->cmd_lock);
 821         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 822         spin_unlock_bh(&conn->cmd_lock);
 823
 824         cmd->i_state = ISTATE_SEND_REJECT;
 825         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 826
 827         return -1;
 828 }
 829 EXPORT_SYMBOL(iscsit_add_reject);
 830
 831 static int iscsit_add_reject_from_cmd(
 832         struct iscsi_cmd *cmd,
 833         u8 reason,
 834         bool add_to_conn,
 835         unsigned char *buf)
 836 {
 837         struct iscsi_conn *conn;
 838
 839         if (!cmd->conn) {
 840                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 841                                 cmd->init_task_tag);
 842                 return -1;
 843         }
 844         conn = cmd->conn;
 845
 846         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 847         cmd->reject_reason = reason;
 848
 849         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 850         if (!cmd->buf_ptr) {
 851                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 852                 iscsit_free_cmd(cmd, false);
 853                 return -1;
 854         }
 855
 856         if (add_to_conn) {
 857                 spin_lock_bh(&conn->cmd_lock);
 858                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 859                 spin_unlock_bh(&conn->cmd_lock);
 860         }
 861
 862         cmd->i_state = ISTATE_SEND_REJECT;
 863         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 864         /*
 865          * Perform the kref_put now if se_cmd has already been setup by
 866          * scsit_setup_scsi_cmd()
 867          */
 868         if (cmd->se_cmd.se_tfo != NULL) {
 869                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 870                 target_put_sess_cmd(&cmd->se_cmd);
 871         }
 872         return -1;
 873 }
 874
 875 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 876                                  unsigned char *buf)
 877 {
 878         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 879 }
 880
 881 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 882 {
 883         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 884 }
 885 EXPORT_SYMBOL(iscsit_reject_cmd);
 886
 887 /*
 888  * Map some portion of the allocated scatterlist to an iovec, suitable for
 889  * kernel sockets to copy data in/out.
 890  */
 891 static int iscsit_map_iovec(
 892         struct iscsi_cmd *cmd,
 893         struct kvec *iov,
 894         u32 data_offset,
 895         u32 data_length)
 896 {
 897         u32 i = 0;
 898         struct scatterlist *sg;
 899         unsigned int page_off;
 900
 901         /*
 902          * We know each entry in t_data_sg contains a page.
 903          */
 904         u32 ent = data_offset / PAGE_SIZE;
 905
 906         if (ent >= cmd->se_cmd.t_data_nents) {
 907                 pr_err("Initial page entry out-of-bounds\n");
 908                 return -1;
 909         }
 910
 911         sg = &cmd->se_cmd.t_data_sg[ent];
 912         page_off = (data_offset % PAGE_SIZE);
 913
 914         cmd->first_data_sg = sg;
 915         cmd->first_data_sg_off = page_off;
 916
 917         while (data_length) {
 918                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 919
 920                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 921                 iov[i].iov_len = cur_len;
 922
 923                 data_length -= cur_len;
 924                 page_off = 0;
 925                 sg = sg_next(sg);
 926                 i++;
 927         }
 928
 929         cmd->kmapped_nents = i;
 930
 931         return i;
 932 }
 933
 934 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 935 {
 936         u32 i;
 937         struct scatterlist *sg;
 938
 939         sg = cmd->first_data_sg;
 940
 941         for (i = 0; i < cmd->kmapped_nents; i++)
 942                 kunmap(sg_page(&sg[i]));
 943 }
 944
 945 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 946 {
 947         LIST_HEAD(ack_list);
 948         struct iscsi_cmd *cmd, *cmd_p;
 949
 950         conn->exp_statsn = exp_statsn;
 951
 952         if (conn->sess->sess_ops->RDMAExtensions)
 953                 return;
 954
 955         spin_lock_bh(&conn->cmd_lock);
 956         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 957                 spin_lock(&cmd->istate_lock);
 958                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 959                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 960                         cmd->i_state = ISTATE_REMOVE;
 961                         spin_unlock(&cmd->istate_lock);
 962                         list_move_tail(&cmd->i_conn_node, &ack_list);
 963                         continue;
 964                 }
 965                 spin_unlock(&cmd->istate_lock);
 966         }
 967         spin_unlock_bh(&conn->cmd_lock);
 968
 969         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 970                 list_del_init(&cmd->i_conn_node);
 971                 iscsit_free_cmd(cmd, false);
 972         }
 973 }
 974
 975 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 976 {
 977         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 978
 979         iov_count += ISCSI_IOV_DATA_BUFFER;
 980         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 981         if (!cmd->iov_data)
 982                 return -ENOMEM;
 983
 984         cmd->orig_iov_data_count = iov_count;
 985         return 0;
 986 }
 987
 988 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 989                           unsigned char *buf)
 990 {
 991         int data_direction, payload_length;
 992         struct iscsi_scsi_req *hdr;
 993         int iscsi_task_attr;
 994         int sam_task_attr;
 995
 996         atomic_long_inc(&conn->sess->cmd_pdus);
 997
 998         hdr                     = (struct iscsi_scsi_req *) buf;
 999         payload_length          = ntoh24(hdr->dlength);
1000
1001         /* FIXME; Add checks for AdditionalHeaderSegment */
1002
1003         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1004             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1005                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1006                                 " not set. Bad iSCSI Initiator.\n");
1007                 return iscsit_add_reject_cmd(cmd,
1008                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1009         }
1010
1011         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1012              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013                 /*
1014                  * From RFC-3720 Section 10.3.1:
1015                  *
1016                  * "Either or both of R and W MAY be 1 when either the
1017                  *  Expected Data Transfer Length and/or Bidirectional Read
1018                  *  Expected Data Transfer Length are 0"
1019                  *
1020                  * For this case, go ahead and clear the unnecssary bits
1021                  * to avoid any confusion with ->data_direction.
1022                  */
1023                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1024                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1025
1026                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1027                         " set when Expected Data Transfer Length is 0 for"
1028                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1029         }
1030
1031         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1032             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1033                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1034                         " MUST be set if Expected Data Transfer Length is not 0."
1035                         " Bad iSCSI Initiator\n");
1036                 return iscsit_add_reject_cmd(cmd,
1037                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1038         }
1039
1040         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1041             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1042                 pr_err("Bidirectional operations not supported!\n");
1043                 return iscsit_add_reject_cmd(cmd,
1044                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1045         }
1046
1047         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1048                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1049                                 " Scsi Command PDU.\n");
1050                 return iscsit_add_reject_cmd(cmd,
1051                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1052         }
1053
1054         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1055                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1056                         " protocol error.\n", payload_length);
1057                 return iscsit_add_reject_cmd(cmd,
1058                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1059         }
1060
1061         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1062             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1063                 pr_err("Expected Data Transfer Length and Length of"
1064                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1065                         " bit is not set protocol error\n");
1066                 return iscsit_add_reject_cmd(cmd,
1067                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1068         }
1069
1070         if (payload_length > be32_to_cpu(hdr->data_length)) {
1071                 pr_err("DataSegmentLength: %u is greater than"
1072                         " EDTL: %u, protocol error.\n", payload_length,
1073                                 hdr->data_length);
1074                 return iscsit_add_reject_cmd(cmd,
1075                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1076         }
1077
1078         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1079                 pr_err("DataSegmentLength: %u is greater than"
1080                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1081                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1082                 return iscsit_add_reject_cmd(cmd,
1083                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1084         }
1085
1086         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1087                 pr_err("DataSegmentLength: %u is greater than"
1088                         " FirstBurstLength: %u, protocol error.\n",
1089                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1090                 return iscsit_add_reject_cmd(cmd,
1091                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1092         }
1093
1094         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1095                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1096                           DMA_NONE;
1097
1098         cmd->data_direction = data_direction;
1099         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100         /*
1101          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102          */
1103         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1104             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1105                 sam_task_attr = TCM_SIMPLE_TAG;
1106         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1107                 sam_task_attr = TCM_ORDERED_TAG;
1108         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1109                 sam_task_attr = TCM_HEAD_TAG;
1110         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1111                 sam_task_attr = TCM_ACA_TAG;
1112         else {
1113                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1114                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1115                 sam_task_attr = TCM_SIMPLE_TAG;
1116         }
1117
1118         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1119         cmd->i_state            = ISTATE_NEW_CMD;
1120         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1121         cmd->immediate_data     = (payload_length) ? 1 : 0;
1122         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1123                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1124         if (cmd->unsolicited_data)
1125                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126
1127         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1128         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1129                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1130         else
1131                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1132         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1133         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1134         cmd->first_burst_len    = payload_length;
1135
1136         if (!conn->sess->sess_ops->RDMAExtensions &&
1137              cmd->data_direction == DMA_FROM_DEVICE) {
1138                 struct iscsi_datain_req *dr;
1139
1140                 dr = iscsit_allocate_datain_req();
1141                 if (!dr)
1142                         return iscsit_add_reject_cmd(cmd,
1143                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1144
1145                 iscsit_attach_datain_req(cmd, dr);
1146         }
1147
1148         /*
1149          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150          */
1151         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1152                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1153                         cmd->data_direction, sam_task_attr,
1154                         cmd->sense_buffer + 2);
1155
1156         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1157                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1158                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1159                 conn->cid);
1160
1161         target_get_sess_cmd(&cmd->se_cmd, true);
1162
1163         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1164                                                      scsilun_to_int(&hdr->lun));
1165         if (cmd->sense_reason)
1166                 goto attach_cmd;
1167
1168         /* only used for printks or comparing with ->ref_task_tag */
1169         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1171         if (cmd->sense_reason) {
1172                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1173                         return iscsit_add_reject_cmd(cmd,
1174                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1175                 }
1176
1177                 goto attach_cmd;
1178         }
1179
1180         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1181                 return iscsit_add_reject_cmd(cmd,
1182                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183         }
1184
1185 attach_cmd:
1186         spin_lock_bh(&conn->cmd_lock);
1187         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1188         spin_unlock_bh(&conn->cmd_lock);
1189         /*
1190          * Check if we need to delay processing because of ALUA
1191          * Active/NonOptimized primary access state..
1192          */
1193         core_alua_check_nonop_delay(&cmd->se_cmd);
1194
1195         return 0;
1196 }
1197 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1198
1199 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200 {
1201         iscsit_set_dataout_sequence_values(cmd);
1202
1203         spin_lock_bh(&cmd->dataout_timeout_lock);
1204         iscsit_start_dataout_timer(cmd, cmd->conn);
1205         spin_unlock_bh(&cmd->dataout_timeout_lock);
1206 }
1207 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208
1209 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1210                             struct iscsi_scsi_req *hdr)
1211 {
1212         int cmdsn_ret = 0;
1213         /*
1214          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1215          * the Immediate Bit is not set, and no Immediate
1216          * Data is attached.
1217          *
1218          * A PDU/CmdSN carrying Immediate Data can only
1219          * be processed after the DataCRC has passed.
1220          * If the DataCRC fails, the CmdSN MUST NOT
1221          * be acknowledged. (See below)
1222          */
1223         if (!cmd->immediate_data) {
1224                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1225                                         (unsigned char *)hdr, hdr->cmdsn);
1226                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227                         return -1;
1228                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1229                         target_put_sess_cmd(&cmd->se_cmd);
1230                         return 0;
1231                 }
1232         }
1233
1234         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1235
1236         /*
1237          * If no Immediate Data is attached, it's OK to return now.
1238          */
1239         if (!cmd->immediate_data) {
1240                 if (!cmd->sense_reason && cmd->unsolicited_data)
1241                         iscsit_set_unsoliticed_dataout(cmd);
1242                 if (!cmd->sense_reason)
1243                         return 0;
1244
1245                 target_put_sess_cmd(&cmd->se_cmd);
1246                 return 0;
1247         }
1248
1249         /*
1250          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1251          * execution.  These exceptions are processed in CmdSN order using
1252          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253          */
1254         if (cmd->sense_reason) {
1255                 if (cmd->reject_reason)
1256                         return 0;
1257
1258                 return 1;
1259         }
1260         /*
1261          * Call directly into transport_generic_new_cmd() to perform
1262          * the backend memory allocation.
1263          */
1264         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1265         if (cmd->sense_reason)
1266                 return 1;
1267
1268         return 0;
1269 }
1270 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1271
1272 static int
1273 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1274                           bool dump_payload)
1275 {
1276         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1277         /*
1278          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1279          */
1280         if (dump_payload)
1281                 goto after_immediate_data;
1282
1283         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1284                                         cmd->first_burst_len);
1285 after_immediate_data:
1286         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1287                 /*
1288                  * A PDU/CmdSN carrying Immediate Data passed
1289                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1290                  * Immediate Bit is not set.
1291                  */
1292                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1293                                         (unsigned char *)hdr, hdr->cmdsn);
1294                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1295                         return -1;
1296
1297                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1298                         int rc;
1299
1300                         rc = iscsit_dump_data_payload(cmd->conn,
1301                                                       cmd->first_burst_len, 1);
1302                         target_put_sess_cmd(&cmd->se_cmd);
1303                         return rc;
1304                 } else if (cmd->unsolicited_data)
1305                         iscsit_set_unsoliticed_dataout(cmd);
1306
1307         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1308                 /*
1309                  * Immediate Data failed DataCRC and ERL>=1,
1310                  * silently drop this PDU and let the initiator
1311                  * plug the CmdSN gap.
1312                  *
1313                  * FIXME: Send Unsolicited NOPIN with reserved
1314                  * TTT here to help the initiator figure out
1315                  * the missing CmdSN, although they should be
1316                  * intelligent enough to determine the missing
1317                  * CmdSN and issue a retry to plug the sequence.
1318                  */
1319                 cmd->i_state = ISTATE_REMOVE;
1320                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1321         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1322                 return -1;
1323
1324         return 0;
1325 }
1326
1327 static int
1328 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1329                            unsigned char *buf)
1330 {
1331         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1332         int rc, immed_data;
1333         bool dump_payload = false;
1334
1335         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1336         if (rc < 0)
1337                 return 0;
1338         /*
1339          * Allocation iovecs needed for struct socket operations for
1340          * traditional iSCSI block I/O.
1341          */
1342         if (iscsit_allocate_iovecs(cmd) < 0) {
1343                 return iscsit_reject_cmd(cmd,
1344                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1345         }
1346         immed_data = cmd->immediate_data;
1347
1348         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1349         if (rc < 0)
1350                 return rc;
1351         else if (rc > 0)
1352                 dump_payload = true;
1353
1354         if (!immed_data)
1355                 return 0;
1356
1357         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1358 }
1359
1360 static u32 iscsit_do_crypto_hash_sg(
1361         struct ahash_request *hash,
1362         struct iscsi_cmd *cmd,
1363         u32 data_offset,
1364         u32 data_length,
1365         u32 padding,
1366         u8 *pad_bytes)
1367 {
1368         u32 data_crc;
1369         struct scatterlist *sg;
1370         unsigned int page_off;
1371
1372         crypto_ahash_init(hash);
1373
1374         sg = cmd->first_data_sg;
1375         page_off = cmd->first_data_sg_off;
1376
1377         while (data_length) {
1378                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1379
1380                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1381                 crypto_ahash_update(hash);
1382
1383                 data_length -= cur_len;
1384                 page_off = 0;
1385                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1386                 sg = sg_next(sg);
1387         }
1388
1389         if (padding) {
1390                 struct scatterlist pad_sg;
1391
1392                 sg_init_one(&pad_sg, pad_bytes, padding);
1393                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1394                                         padding);
1395                 crypto_ahash_finup(hash);
1396         } else {
1397                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1398                 crypto_ahash_final(hash);
1399         }
1400
1401         return data_crc;
1402 }
1403
1404 static void iscsit_do_crypto_hash_buf(
1405         struct ahash_request *hash,
1406         const void *buf,
1407         u32 payload_length,
1408         u32 padding,
1409         u8 *pad_bytes,
1410         u8 *data_crc)
1411 {
1412         struct scatterlist sg[2];
1413
1414         sg_init_table(sg, ARRAY_SIZE(sg));
1415         sg_set_buf(sg, buf, payload_length);
1416         sg_set_buf(sg + 1, pad_bytes, padding);
1417
1418         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1419
1420         crypto_ahash_digest(hash);
1421 }
1422
1423 int
1424 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1425                            struct iscsi_cmd *cmd, u32 payload_length,
1426                            bool *success)
1427 {
1428         struct iscsi_data *hdr = buf;
1429         struct se_cmd *se_cmd;
1430         int rc;
1431
1432         /* iSCSI write */
1433         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1434
1435         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1436                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1437                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1438                 payload_length, conn->cid);
1439
1440         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1441                 pr_err("Command ITT: 0x%08x received DataOUT after"
1442                         " last DataOUT received, dumping payload\n",
1443                         cmd->init_task_tag);
1444                 return iscsit_dump_data_payload(conn, payload_length, 1);
1445         }
1446
1447         if (cmd->data_direction != DMA_TO_DEVICE) {
1448                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1449                         " NON-WRITE command.\n", cmd->init_task_tag);
1450                 return iscsit_dump_data_payload(conn, payload_length, 1);
1451         }
1452         se_cmd = &cmd->se_cmd;
1453         iscsit_mod_dataout_timer(cmd);
1454
1455         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1456                 pr_err("DataOut Offset: %u, Length %u greater than"
1457                         " iSCSI Command EDTL %u, protocol error.\n",
1458                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1459                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1460         }
1461
1462         if (cmd->unsolicited_data) {
1463                 int dump_unsolicited_data = 0;
1464
1465                 if (conn->sess->sess_ops->InitialR2T) {
1466                         pr_err("Received unexpected unsolicited data"
1467                                 " while InitialR2T=Yes, protocol error.\n");
1468                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1469                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1470                         return -1;
1471                 }
1472                 /*
1473                  * Special case for dealing with Unsolicited DataOUT
1474                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1475                  * failures;
1476                  */
1477
1478                 /* Something's amiss if we're not in WRITE_PENDING state... */
1479                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1480                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1481                         dump_unsolicited_data = 1;
1482
1483                 if (dump_unsolicited_data) {
1484                         /*
1485                          * Check if a delayed TASK_ABORTED status needs to
1486                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1487                          * received with the unsolicited data out.
1488                          */
1489                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1490                                 iscsit_stop_dataout_timer(cmd);
1491
1492                         transport_check_aborted_status(se_cmd,
1493                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1494                         return iscsit_dump_data_payload(conn, payload_length, 1);
1495                 }
1496         } else {
1497                 /*
1498                  * For the normal solicited data path:
1499                  *
1500                  * Check for a delayed TASK_ABORTED status and dump any
1501                  * incoming data out payload if one exists.  Also, when the
1502                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1503                  * data out sequence, we decrement outstanding_r2ts.  Once
1504                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1505                  * TASK_ABORTED status.
1506                  */
1507                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1508                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1509                                 if (--cmd->outstanding_r2ts < 1) {
1510                                         iscsit_stop_dataout_timer(cmd);
1511                                         transport_check_aborted_status(
1512                                                         se_cmd, 1);
1513                                 }
1514
1515                         return iscsit_dump_data_payload(conn, payload_length, 1);
1516                 }
1517         }
1518         /*
1519          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1520          * within-command recovery checks before receiving the payload.
1521          */
1522         rc = iscsit_check_pre_dataout(cmd, buf);
1523         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1524                 return 0;
1525         else if (rc == DATAOUT_CANNOT_RECOVER)
1526                 return -1;
1527         *success = true;
1528         return 0;
1529 }
1530 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1531
1532 int
1533 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1534                          struct iscsi_cmd **out_cmd)
1535 {
1536         struct iscsi_data *hdr = buf;
1537         struct iscsi_cmd *cmd;
1538         u32 payload_length = ntoh24(hdr->dlength);
1539         int rc;
1540         bool success = false;
1541
1542         if (!payload_length) {
1543                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1544                 return 0;
1545         }
1546
1547         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1548                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1549                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1550                         conn->conn_ops->MaxXmitDataSegmentLength);
1551                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1552         }
1553
1554         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1555         if (!cmd)
1556                 return 0;
1557
1558         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1559
1560         if (success)
1561                 *out_cmd = cmd;
1562
1563         return rc;
1564 }
1565 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1566
1567 static int
1568 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1569                    struct iscsi_data *hdr)
1570 {
1571         struct kvec *iov;
1572         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1573         u32 payload_length = ntoh24(hdr->dlength);
1574         int iov_ret, data_crc_failed = 0;
1575
1576         rx_size += payload_length;
1577         iov = &cmd->iov_data[0];
1578
1579         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1580                                    payload_length);
1581         if (iov_ret < 0)
1582                 return -1;
1583
1584         iov_count += iov_ret;
1585
1586         padding = ((-payload_length) & 3);
1587         if (padding != 0) {
1588                 iov[iov_count].iov_base = cmd->pad_bytes;
1589                 iov[iov_count++].iov_len = padding;
1590                 rx_size += padding;
1591                 pr_debug("Receiving %u padding bytes.\n", padding);
1592         }
1593
1594         if (conn->conn_ops->DataDigest) {
1595                 iov[iov_count].iov_base = &checksum;
1596                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1597                 rx_size += ISCSI_CRC_LEN;
1598         }
1599
1600         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1601
1602         iscsit_unmap_iovec(cmd);
1603
1604         if (rx_got != rx_size)
1605                 return -1;
1606
1607         if (conn->conn_ops->DataDigest) {
1608                 u32 data_crc;
1609
1610                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1611                                                     be32_to_cpu(hdr->offset),
1612                                                     payload_length, padding,
1613                                                     cmd->pad_bytes);
1614
1615                 if (checksum != data_crc) {
1616                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1617                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1618                                 " does not match computed 0x%08x\n",
1619                                 hdr->itt, hdr->offset, payload_length,
1620                                 hdr->datasn, checksum, data_crc);
1621                         data_crc_failed = 1;
1622                 } else {
1623                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1624                                 " %u bytes of Data Out\n", checksum,
1625                                 payload_length);
1626                 }
1627         }
1628
1629         return data_crc_failed;
1630 }
1631
1632 int
1633 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1634                              bool data_crc_failed)
1635 {
1636         struct iscsi_conn *conn = cmd->conn;
1637         int rc, ooo_cmdsn;
1638         /*
1639          * Increment post receive data and CRC values or perform
1640          * within-command recovery.
1641          */
1642         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1643         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1644                 return 0;
1645         else if (rc == DATAOUT_SEND_R2T) {
1646                 iscsit_set_dataout_sequence_values(cmd);
1647                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1648         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1649                 /*
1650                  * Handle extra special case for out of order
1651                  * Unsolicited Data Out.
1652                  */
1653                 spin_lock_bh(&cmd->istate_lock);
1654                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1655                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1656                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1657                 spin_unlock_bh(&cmd->istate_lock);
1658
1659                 iscsit_stop_dataout_timer(cmd);
1660                 if (ooo_cmdsn)
1661                         return 0;
1662                 target_execute_cmd(&cmd->se_cmd);
1663                 return 0;
1664         } else /* DATAOUT_CANNOT_RECOVER */
1665                 return -1;
1666
1667         return 0;
1668 }
1669 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1670
1671 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1672 {
1673         struct iscsi_cmd *cmd = NULL;
1674         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1675         int rc;
1676         bool data_crc_failed = false;
1677
1678         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1679         if (rc < 0)
1680                 return 0;
1681         else if (!cmd)
1682                 return 0;
1683
1684         rc = iscsit_get_dataout(conn, cmd, hdr);
1685         if (rc < 0)
1686                 return rc;
1687         else if (rc > 0)
1688                 data_crc_failed = true;
1689
1690         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1691 }
1692
1693 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1694                          struct iscsi_nopout *hdr)
1695 {
1696         u32 payload_length = ntoh24(hdr->dlength);
1697
1698         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1699                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1700                 if (!cmd)
1701                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1702                                                  (unsigned char *)hdr);
1703
1704                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1705                                          (unsigned char *)hdr);
1706         }
1707
1708         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1709                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1710                         " not set, protocol error.\n");
1711                 if (!cmd)
1712                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1713                                                  (unsigned char *)hdr);
1714
1715                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1716                                          (unsigned char *)hdr);
1717         }
1718
1719         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1720                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1721                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1722                         " error.\n", payload_length,
1723                         conn->conn_ops->MaxXmitDataSegmentLength);
1724                 if (!cmd)
1725                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1726                                                  (unsigned char *)hdr);
1727
1728                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1729                                          (unsigned char *)hdr);
1730         }
1731
1732         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1733                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1734                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1735                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1736                 payload_length);
1737         /*
1738          * This is not a response to a Unsolicited NopIN, which means
1739          * it can either be a NOPOUT ping request (with a valid ITT),
1740          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1741          * Either way, make sure we allocate an struct iscsi_cmd, as both
1742          * can contain ping data.
1743          */
1744         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1745                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1746                 cmd->i_state            = ISTATE_SEND_NOPIN;
1747                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1748                                                 1 : 0);
1749                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1750                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1751                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1752                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1753                 cmd->data_direction     = DMA_NONE;
1754         }
1755
1756         return 0;
1757 }
1758 EXPORT_SYMBOL(iscsit_setup_nop_out);
1759
1760 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1761                            struct iscsi_nopout *hdr)
1762 {
1763         struct iscsi_cmd *cmd_p = NULL;
1764         int cmdsn_ret = 0;
1765         /*
1766          * Initiator is expecting a NopIN ping reply..
1767          */
1768         if (hdr->itt != RESERVED_ITT) {
1769                 if (!cmd)
1770                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1771                                                 (unsigned char *)hdr);
1772
1773                 spin_lock_bh(&conn->cmd_lock);
1774                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1775                 spin_unlock_bh(&conn->cmd_lock);
1776
1777                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1778
1779                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1780                         iscsit_add_cmd_to_response_queue(cmd, conn,
1781                                                          cmd->i_state);
1782                         return 0;
1783                 }
1784
1785                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1786                                 (unsigned char *)hdr, hdr->cmdsn);
1787                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1788                         return 0;
1789                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1790                         return -1;
1791
1792                 return 0;
1793         }
1794         /*
1795          * This was a response to a unsolicited NOPIN ping.
1796          */
1797         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1798                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1799                 if (!cmd_p)
1800                         return -EINVAL;
1801
1802                 iscsit_stop_nopin_response_timer(conn);
1803
1804                 cmd_p->i_state = ISTATE_REMOVE;
1805                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1806
1807                 iscsit_start_nopin_timer(conn);
1808                 return 0;
1809         }
1810         /*
1811          * Otherwise, initiator is not expecting a NOPIN is response.
1812          * Just ignore for now.
1813          */
1814
1815         if (cmd)
1816                 iscsit_free_cmd(cmd, false);
1817
1818         return 0;
1819 }
1820 EXPORT_SYMBOL(iscsit_process_nop_out);
1821
1822 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1823                                  unsigned char *buf)
1824 {
1825         unsigned char *ping_data = NULL;
1826         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1827         struct kvec *iov = NULL;
1828         u32 payload_length = ntoh24(hdr->dlength);
1829         int ret;
1830
1831         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1832         if (ret < 0)
1833                 return 0;
1834         /*
1835          * Handle NOP-OUT payload for traditional iSCSI sockets
1836          */
1837         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1838                 u32 checksum, data_crc, padding = 0;
1839                 int niov = 0, rx_got, rx_size = payload_length;
1840
1841                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1842                 if (!ping_data) {
1843                         ret = -1;
1844                         goto out;
1845                 }
1846
1847                 iov = &cmd->iov_misc[0];
1848                 iov[niov].iov_base      = ping_data;
1849                 iov[niov++].iov_len     = payload_length;
1850
1851                 padding = ((-payload_length) & 3);
1852                 if (padding != 0) {
1853                         pr_debug("Receiving %u additional bytes"
1854                                 " for padding.\n", padding);
1855                         iov[niov].iov_base      = &cmd->pad_bytes;
1856                         iov[niov++].iov_len     = padding;
1857                         rx_size += padding;
1858                 }
1859                 if (conn->conn_ops->DataDigest) {
1860                         iov[niov].iov_base      = &checksum;
1861                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1862                         rx_size += ISCSI_CRC_LEN;
1863                 }
1864
1865                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1866                 if (rx_got != rx_size) {
1867                         ret = -1;
1868                         goto out;
1869                 }
1870
1871                 if (conn->conn_ops->DataDigest) {
1872                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1873                                         ping_data, payload_length,
1874                                         padding, cmd->pad_bytes,
1875                                         (u8 *)&data_crc);
1876
1877                         if (checksum != data_crc) {
1878                                 pr_err("Ping data CRC32C DataDigest"
1879                                 " 0x%08x does not match computed 0x%08x\n",
1880                                         checksum, data_crc);
1881                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1882                                         pr_err("Unable to recover from"
1883                                         " NOPOUT Ping DataCRC failure while in"
1884                                                 " ERL=0.\n");
1885                                         ret = -1;
1886                                         goto out;
1887                                 } else {
1888                                         /*
1889                                          * Silently drop this PDU and let the
1890                                          * initiator plug the CmdSN gap.
1891                                          */
1892                                         pr_debug("Dropping NOPOUT"
1893                                         " Command CmdSN: 0x%08x due to"
1894                                         " DataCRC error.\n", hdr->cmdsn);
1895                                         ret = 0;
1896                                         goto out;
1897                                 }
1898                         } else {
1899                                 pr_debug("Got CRC32C DataDigest"
1900                                 " 0x%08x for %u bytes of ping data.\n",
1901                                         checksum, payload_length);
1902                         }
1903                 }
1904
1905                 ping_data[payload_length] = '\0';
1906                 /*
1907                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1908                  */
1909                 cmd->buf_ptr = ping_data;
1910                 cmd->buf_ptr_size = payload_length;
1911
1912                 pr_debug("Got %u bytes of NOPOUT ping"
1913                         " data.\n", payload_length);
1914                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1915         }
1916
1917         return iscsit_process_nop_out(conn, cmd, hdr);
1918 out:
1919         if (cmd)
1920                 iscsit_free_cmd(cmd, false);
1921
1922         kfree(ping_data);
1923         return ret;
1924 }
1925
1926 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1927 {
1928         switch (iscsi_tmf) {
1929         case ISCSI_TM_FUNC_ABORT_TASK:
1930                 return TMR_ABORT_TASK;
1931         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1932                 return TMR_ABORT_TASK_SET;
1933         case ISCSI_TM_FUNC_CLEAR_ACA:
1934                 return TMR_CLEAR_ACA;
1935         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1936                 return TMR_CLEAR_TASK_SET;
1937         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1938                 return TMR_LUN_RESET;
1939         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1940                 return TMR_TARGET_WARM_RESET;
1941         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1942                 return TMR_TARGET_COLD_RESET;
1943         default:
1944                 return TMR_UNKNOWN;
1945         }
1946 }
1947
1948 int
1949 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1950                            unsigned char *buf)
1951 {
1952         struct se_tmr_req *se_tmr;
1953         struct iscsi_tmr_req *tmr_req;
1954         struct iscsi_tm *hdr;
1955         int out_of_order_cmdsn = 0, ret;
1956         bool sess_ref = false;
1957         u8 function, tcm_function = TMR_UNKNOWN;
1958
1959         hdr                     = (struct iscsi_tm *) buf;
1960         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1961         function = hdr->flags;
1962
1963         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1964                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1965                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1966                 hdr->rtt, hdr->refcmdsn, conn->cid);
1967
1968         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1969             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1970              hdr->rtt != RESERVED_ITT)) {
1971                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1972                 hdr->rtt = RESERVED_ITT;
1973         }
1974
1975         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1976                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1977                 pr_err("Task Management Request TASK_REASSIGN not"
1978                         " issued as immediate command, bad iSCSI Initiator"
1979                                 "implementation\n");
1980                 return iscsit_add_reject_cmd(cmd,
1981                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1982         }
1983         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1984             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1985                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1986
1987         cmd->data_direction = DMA_NONE;
1988         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1989         if (!cmd->tmr_req)
1990                 return iscsit_add_reject_cmd(cmd,
1991                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1992                                              buf);
1993
1994         /*
1995          * TASK_REASSIGN for ERL=2 / connection stays inside of
1996          * LIO-Target $FABRIC_MOD
1997          */
1998         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1999                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2000                                       conn->sess->se_sess, 0, DMA_NONE,
2001                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2002
2003                 target_get_sess_cmd(&cmd->se_cmd, true);
2004                 sess_ref = true;
2005                 tcm_function = iscsit_convert_tmf(function);
2006                 if (tcm_function == TMR_UNKNOWN) {
2007                         pr_err("Unknown iSCSI TMR Function:"
2008                                " 0x%02x\n", function);
2009                         return iscsit_add_reject_cmd(cmd,
2010                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2011                 }
2012         }
2013         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2014                                  GFP_KERNEL);
2015         if (ret < 0)
2016                 return iscsit_add_reject_cmd(cmd,
2017                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2018
2019         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2020
2021         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2022         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2023         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2024         cmd->init_task_tag      = hdr->itt;
2025         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2026         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2027         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2028         se_tmr                  = cmd->se_cmd.se_tmr_req;
2029         tmr_req                 = cmd->tmr_req;
2030         /*
2031          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2032          */
2033         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2034                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2035                                                scsilun_to_int(&hdr->lun));
2036                 if (ret < 0) {
2037                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2038                         goto attach;
2039                 }
2040         }
2041
2042         switch (function) {
2043         case ISCSI_TM_FUNC_ABORT_TASK:
2044                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2045                 if (se_tmr->response)
2046                         goto attach;
2047                 break;
2048         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2049         case ISCSI_TM_FUNC_CLEAR_ACA:
2050         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2051         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2052                 break;
2053         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2054                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2055                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2056                         goto attach;
2057                 }
2058                 break;
2059         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2060                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2061                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2062                         goto attach;
2063                 }
2064                 break;
2065         case ISCSI_TM_FUNC_TASK_REASSIGN:
2066                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2067                 /*
2068                  * Perform sanity checks on the ExpDataSN only if the
2069                  * TASK_REASSIGN was successful.
2070                  */
2071                 if (se_tmr->response)
2072                         break;
2073
2074                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2075                         return iscsit_add_reject_cmd(cmd,
2076                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2077                 break;
2078         default:
2079                 pr_err("Unknown TMR function: 0x%02x, protocol"
2080                         " error.\n", function);
2081                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2082                 goto attach;
2083         }
2084
2085         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2086             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2087                 se_tmr->call_transport = 1;
2088 attach:
2089         spin_lock_bh(&conn->cmd_lock);
2090         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2091         spin_unlock_bh(&conn->cmd_lock);
2092
2093         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2094                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2095                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2096                         out_of_order_cmdsn = 1;
2097                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2098                         return 0;
2099                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2100                         return -1;
2101         }
2102         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2103
2104         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2105                 return 0;
2106         /*
2107          * Found the referenced task, send to transport for processing.
2108          */
2109         if (se_tmr->call_transport)
2110                 return transport_generic_handle_tmr(&cmd->se_cmd);
2111
2112         /*
2113          * Could not find the referenced LUN, task, or Task Management
2114          * command not authorized or supported.  Change state and
2115          * let the tx_thread send the response.
2116          *
2117          * For connection recovery, this is also the default action for
2118          * TMR TASK_REASSIGN.
2119          */
2120         if (sess_ref) {
2121                 pr_debug("Handle TMR, using sess_ref=true check\n");
2122                 target_put_sess_cmd(&cmd->se_cmd);
2123         }
2124
2125         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2126         return 0;
2127 }
2128 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2129
2130 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2131 int
2132 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2133                       struct iscsi_text *hdr)
2134 {
2135         u32 payload_length = ntoh24(hdr->dlength);
2136
2137         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2138                 pr_err("Unable to accept text parameter length: %u"
2139                         "greater than MaxXmitDataSegmentLength %u.\n",
2140                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2141                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2142                                          (unsigned char *)hdr);
2143         }
2144
2145         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2146              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2147                 pr_err("Multi sequence text commands currently not supported\n");
2148                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2149                                         (unsigned char *)hdr);
2150         }
2151
2152         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2153                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2154                 hdr->exp_statsn, payload_length);
2155
2156         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2157         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2158         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2159         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2160         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2161         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2162         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2163         cmd->data_direction     = DMA_NONE;
2164         cmd->text_in_ptr        = NULL;
2165
2166         return 0;
2167 }
2168 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2169
2170 int
2171 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2172                         struct iscsi_text *hdr)
2173 {
2174         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2175         int cmdsn_ret;
2176
2177         if (!text_in) {
2178                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2179                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2180                         pr_err("Unable to locate text_in buffer for sendtargets"
2181                                " discovery\n");
2182                         goto reject;
2183                 }
2184                 goto empty_sendtargets;
2185         }
2186         if (strncmp("SendTargets", text_in, 11) != 0) {
2187                 pr_err("Received Text Data that is not"
2188                         " SendTargets, cannot continue.\n");
2189                 goto reject;
2190         }
2191         text_ptr = strchr(text_in, '=');
2192         if (!text_ptr) {
2193                 pr_err("No \"=\" separator found in Text Data,"
2194                         "  cannot continue.\n");
2195                 goto reject;
2196         }
2197         if (!strncmp("=All", text_ptr, 4)) {
2198                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2199         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2200                    !strncmp("=eui.", text_ptr, 5)) {
2201                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2202         } else {
2203                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2204                 goto reject;
2205         }
2206
2207         spin_lock_bh(&conn->cmd_lock);
2208         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2209         spin_unlock_bh(&conn->cmd_lock);
2210
2211 empty_sendtargets:
2212         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2213
2214         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2215                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2216                                 (unsigned char *)hdr, hdr->cmdsn);
2217                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2218                         return -1;
2219
2220                 return 0;
2221         }
2222
2223         return iscsit_execute_cmd(cmd, 0);
2224
2225 reject:
2226         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2227                                  (unsigned char *)hdr);
2228 }
2229 EXPORT_SYMBOL(iscsit_process_text_cmd);
2230
2231 static int
2232 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2233                        unsigned char *buf)
2234 {
2235         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2236         char *text_in = NULL;
2237         u32 payload_length = ntoh24(hdr->dlength);
2238         int rx_size, rc;
2239
2240         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2241         if (rc < 0)
2242                 return 0;
2243
2244         rx_size = payload_length;
2245         if (payload_length) {
2246                 u32 checksum = 0, data_crc = 0;
2247                 u32 padding = 0, pad_bytes = 0;
2248                 int niov = 0, rx_got;
2249                 struct kvec iov[3];
2250
2251                 text_in = kzalloc(payload_length, GFP_KERNEL);
2252                 if (!text_in)
2253                         goto reject;
2254
2255                 cmd->text_in_ptr = text_in;
2256
2257                 memset(iov, 0, 3 * sizeof(struct kvec));
2258                 iov[niov].iov_base      = text_in;
2259                 iov[niov++].iov_len     = payload_length;
2260
2261                 padding = ((-payload_length) & 3);
2262                 if (padding != 0) {
2263                         iov[niov].iov_base = &pad_bytes;
2264                         iov[niov++].iov_len  = padding;
2265                         rx_size += padding;
2266                         pr_debug("Receiving %u additional bytes"
2267                                         " for padding.\n", padding);
2268                 }
2269                 if (conn->conn_ops->DataDigest) {
2270                         iov[niov].iov_base      = &checksum;
2271                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2272                         rx_size += ISCSI_CRC_LEN;
2273                 }
2274
2275                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2276                 if (rx_got != rx_size)
2277                         goto reject;
2278
2279                 if (conn->conn_ops->DataDigest) {
2280                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2281                                         text_in, payload_length,
2282                                         padding, (u8 *)&pad_bytes,
2283                                         (u8 *)&data_crc);
2284
2285                         if (checksum != data_crc) {
2286                                 pr_err("Text data CRC32C DataDigest"
2287                                         " 0x%08x does not match computed"
2288                                         " 0x%08x\n", checksum, data_crc);
2289                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2290                                         pr_err("Unable to recover from"
2291                                         " Text Data digest failure while in"
2292                                                 " ERL=0.\n");
2293                                         goto reject;
2294                                 } else {
2295                                         /*
2296                                          * Silently drop this PDU and let the
2297                                          * initiator plug the CmdSN gap.
2298                                          */
2299                                         pr_debug("Dropping Text"
2300                                         " Command CmdSN: 0x%08x due to"
2301                                         " DataCRC error.\n", hdr->cmdsn);
2302                                         kfree(text_in);
2303                                         return 0;
2304                                 }
2305                         } else {
2306                                 pr_debug("Got CRC32C DataDigest"
2307                                         " 0x%08x for %u bytes of text data.\n",
2308                                                 checksum, payload_length);
2309                         }
2310                 }
2311                 text_in[payload_length - 1] = '\0';
2312                 pr_debug("Successfully read %d bytes of text"
2313                                 " data.\n", payload_length);
2314         }
2315
2316         return iscsit_process_text_cmd(conn, cmd, hdr);
2317
2318 reject:
2319         kfree(cmd->text_in_ptr);
2320         cmd->text_in_ptr = NULL;
2321         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2322 }
2323
2324 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2325 {
2326         struct iscsi_conn *conn_p;
2327         struct iscsi_session *sess = conn->sess;
2328
2329         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2330                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2331
2332         atomic_set(&sess->session_logout, 1);
2333         atomic_set(&conn->conn_logout_remove, 1);
2334         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2335
2336         iscsit_inc_conn_usage_count(conn);
2337         iscsit_inc_session_usage_count(sess);
2338
2339         spin_lock_bh(&sess->conn_lock);
2340         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2341                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2342                         continue;
2343
2344                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2345                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2346         }
2347         spin_unlock_bh(&sess->conn_lock);
2348
2349         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2350
2351         return 0;
2352 }
2353
2354 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2355 {
2356         struct iscsi_conn *l_conn;
2357         struct iscsi_session *sess = conn->sess;
2358
2359         pr_debug("Received logout request CLOSECONNECTION for CID:"
2360                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2361
2362         /*
2363          * A Logout Request with a CLOSECONNECTION reason code for a CID
2364          * can arrive on a connection with a differing CID.
2365          */
2366         if (conn->cid == cmd->logout_cid) {
2367                 spin_lock_bh(&conn->state_lock);
2368                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2369                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2370
2371                 atomic_set(&conn->conn_logout_remove, 1);
2372                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2373                 iscsit_inc_conn_usage_count(conn);
2374
2375                 spin_unlock_bh(&conn->state_lock);
2376         } else {
2377                 /*
2378                  * Handle all different cid CLOSECONNECTION requests in
2379                  * iscsit_logout_post_handler_diffcid() as to give enough
2380                  * time for any non immediate command's CmdSN to be
2381                  * acknowledged on the connection in question.
2382                  *
2383                  * Here we simply make sure the CID is still around.
2384                  */
2385                 l_conn = iscsit_get_conn_from_cid(sess,
2386                                 cmd->logout_cid);
2387                 if (!l_conn) {
2388                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2389                         iscsit_add_cmd_to_response_queue(cmd, conn,
2390                                         cmd->i_state);
2391                         return 0;
2392                 }
2393
2394                 iscsit_dec_conn_usage_count(l_conn);
2395         }
2396
2397         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2398
2399         return 0;
2400 }
2401
2402 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2403 {
2404         struct iscsi_session *sess = conn->sess;
2405
2406         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2407                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2408
2409         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2410                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2411                         " while ERL!=2.\n");
2412                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2413                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2414                 return 0;
2415         }
2416
2417         if (conn->cid == cmd->logout_cid) {
2418                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2419                         " with CID: %hu on CID: %hu, implementation error.\n",
2420                                 cmd->logout_cid, conn->cid);
2421                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2422                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423                 return 0;
2424         }
2425
2426         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2427
2428         return 0;
2429 }
2430
2431 int
2432 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2433                         unsigned char *buf)
2434 {
2435         int cmdsn_ret, logout_remove = 0;
2436         u8 reason_code = 0;
2437         struct iscsi_logout *hdr;
2438         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2439
2440         hdr                     = (struct iscsi_logout *) buf;
2441         reason_code             = (hdr->flags & 0x7f);
2442
2443         if (tiqn) {
2444                 spin_lock(&tiqn->logout_stats.lock);
2445                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2446                         tiqn->logout_stats.normal_logouts++;
2447                 else
2448                         tiqn->logout_stats.abnormal_logouts++;
2449                 spin_unlock(&tiqn->logout_stats.lock);
2450         }
2451
2452         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2453                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2454                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2455                 hdr->cid, conn->cid);
2456
2457         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2458                 pr_err("Received logout request on connection that"
2459                         " is not in logged in state, ignoring request.\n");
2460                 iscsit_free_cmd(cmd, false);
2461                 return 0;
2462         }
2463
2464         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2465         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2466         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2467         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2468         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2469         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2470         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2471         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2472         cmd->logout_reason      = reason_code;
2473         cmd->data_direction     = DMA_NONE;
2474
2475         /*
2476          * We need to sleep in these cases (by returning 1) until the Logout
2477          * Response gets sent in the tx thread.
2478          */
2479         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2480            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2481             be16_to_cpu(hdr->cid) == conn->cid))
2482                 logout_remove = 1;
2483
2484         spin_lock_bh(&conn->cmd_lock);
2485         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2486         spin_unlock_bh(&conn->cmd_lock);
2487
2488         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2489                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2490
2491         /*
2492          * Immediate commands are executed, well, immediately.
2493          * Non-Immediate Logout Commands are executed in CmdSN order.
2494          */
2495         if (cmd->immediate_cmd) {
2496                 int ret = iscsit_execute_cmd(cmd, 0);
2497
2498                 if (ret < 0)
2499                         return ret;
2500         } else {
2501                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2502                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2503                         logout_remove = 0;
2504                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2505                         return -1;
2506         }
2507
2508         return logout_remove;
2509 }
2510 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2511
2512 int iscsit_handle_snack(
2513         struct iscsi_conn *conn,
2514         unsigned char *buf)
2515 {
2516         struct iscsi_snack *hdr;
2517
2518         hdr                     = (struct iscsi_snack *) buf;
2519         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2520
2521         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2522                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2523                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2524                         hdr->begrun, hdr->runlength, conn->cid);
2525
2526         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2527                 pr_err("Initiator sent SNACK request while in"
2528                         " ErrorRecoveryLevel=0.\n");
2529                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2530                                          buf);
2531         }
2532         /*
2533          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2534          * call from inside iscsi_send_recovery_datain_or_r2t().
2535          */
2536         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2537         case 0:
2538                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2539                         hdr->itt,
2540                         be32_to_cpu(hdr->ttt),
2541                         be32_to_cpu(hdr->begrun),
2542                         be32_to_cpu(hdr->runlength));
2543         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2544                 return iscsit_handle_status_snack(conn, hdr->itt,
2545                         be32_to_cpu(hdr->ttt),
2546                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2547         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2548                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2549                         be32_to_cpu(hdr->begrun),
2550                         be32_to_cpu(hdr->runlength));
2551         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2552                 /* FIXME: Support R-Data SNACK */
2553                 pr_err("R-Data SNACK Not Supported.\n");
2554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2555                                          buf);
2556         default:
2557                 pr_err("Unknown SNACK type 0x%02x, protocol"
2558                         " error.\n", hdr->flags & 0x0f);
2559                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2560                                          buf);
2561         }
2562
2563         return 0;
2564 }
2565 EXPORT_SYMBOL(iscsit_handle_snack);
2566
2567 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2568 {
2569         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2570             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2571                 wait_for_completion_interruptible_timeout(
2572                                         &conn->rx_half_close_comp,
2573                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2574         }
2575 }
2576
2577 static int iscsit_handle_immediate_data(
2578         struct iscsi_cmd *cmd,
2579         struct iscsi_scsi_req *hdr,
2580         u32 length)
2581 {
2582         int iov_ret, rx_got = 0, rx_size = 0;
2583         u32 checksum, iov_count = 0, padding = 0;
2584         struct iscsi_conn *conn = cmd->conn;
2585         struct kvec *iov;
2586
2587         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2588         if (iov_ret < 0)
2589                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2590
2591         rx_size = length;
2592         iov_count = iov_ret;
2593         iov = &cmd->iov_data[0];
2594
2595         padding = ((-length) & 3);
2596         if (padding != 0) {
2597                 iov[iov_count].iov_base = cmd->pad_bytes;
2598                 iov[iov_count++].iov_len = padding;
2599                 rx_size += padding;
2600         }
2601
2602         if (conn->conn_ops->DataDigest) {
2603                 iov[iov_count].iov_base         = &checksum;
2604                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2605                 rx_size += ISCSI_CRC_LEN;
2606         }
2607
2608         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2609
2610         iscsit_unmap_iovec(cmd);
2611
2612         if (rx_got != rx_size) {
2613                 iscsit_rx_thread_wait_for_tcp(conn);
2614                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2615         }
2616
2617         if (conn->conn_ops->DataDigest) {
2618                 u32 data_crc;
2619
2620                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2621                                                     cmd->write_data_done, length, padding,
2622                                                     cmd->pad_bytes);
2623
2624                 if (checksum != data_crc) {
2625                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2626                                 " does not match computed 0x%08x\n", checksum,
2627                                 data_crc);
2628
2629                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2630                                 pr_err("Unable to recover from"
2631                                         " Immediate Data digest failure while"
2632                                         " in ERL=0.\n");
2633                                 iscsit_reject_cmd(cmd,
2634                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2635                                                 (unsigned char *)hdr);
2636                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2637                         } else {
2638                                 iscsit_reject_cmd(cmd,
2639                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2640                                                 (unsigned char *)hdr);
2641                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2642                         }
2643                 } else {
2644                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2645                                 " %u bytes of Immediate Data\n", checksum,
2646                                 length);
2647                 }
2648         }
2649
2650         cmd->write_data_done += length;
2651
2652         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2653                 spin_lock_bh(&cmd->istate_lock);
2654                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2655                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2656                 spin_unlock_bh(&cmd->istate_lock);
2657         }
2658
2659         return IMMEDIATE_DATA_NORMAL_OPERATION;
2660 }
2661
2662 /*
2663  *      Called with sess->conn_lock held.
2664  */
2665 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2666         with active network interface */
2667 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2668 {
2669         struct iscsi_cmd *cmd;
2670         struct iscsi_conn *conn_p;
2671         bool found = false;
2672
2673         /*
2674          * Only send a Asynchronous Message on connections whos network
2675          * interface is still functional.
2676          */
2677         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2678                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2679                         iscsit_inc_conn_usage_count(conn_p);
2680                         found = true;
2681                         break;
2682                 }
2683         }
2684
2685         if (!found)
2686                 return;
2687
2688         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2689         if (!cmd) {
2690                 iscsit_dec_conn_usage_count(conn_p);
2691                 return;
2692         }
2693
2694         cmd->logout_cid = conn->cid;
2695         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2696         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2697
2698         spin_lock_bh(&conn_p->cmd_lock);
2699         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2700         spin_unlock_bh(&conn_p->cmd_lock);
2701
2702         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2703         iscsit_dec_conn_usage_count(conn_p);
2704 }
2705
2706 static int iscsit_send_conn_drop_async_message(
2707         struct iscsi_cmd *cmd,
2708         struct iscsi_conn *conn)
2709 {
2710         struct iscsi_async *hdr;
2711
2712         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2713
2714         hdr                     = (struct iscsi_async *) cmd->pdu;
2715         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2716         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2717         cmd->init_task_tag      = RESERVED_ITT;
2718         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2719         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2720         cmd->stat_sn            = conn->stat_sn++;
2721         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2722         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2723         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2724         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2725         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2726         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2727         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2728
2729         pr_debug("Sending Connection Dropped Async Message StatSN:"
2730                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2731                         cmd->logout_cid, conn->cid);
2732
2733         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2734 }
2735
2736 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2737 {
2738         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2739             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2740                 wait_for_completion_interruptible_timeout(
2741                                         &conn->tx_half_close_comp,
2742                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2743         }
2744 }
2745
2746 void
2747 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2748                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2749                         bool set_statsn)
2750 {
2751         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2752         hdr->flags              = datain->flags;
2753         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2754                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2755                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2756                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2757                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2758                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2759                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2760                 }
2761         }
2762         hton24(hdr->dlength, datain->length);
2763         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2764                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2765                                 (struct scsi_lun *)&hdr->lun);
2766         else
2767                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2768
2769         hdr->itt                = cmd->init_task_tag;
2770
2771         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2772                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2773         else
2774                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2775         if (set_statsn)
2776                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2777         else
2778                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2779
2780         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2781         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2782         hdr->datasn             = cpu_to_be32(datain->data_sn);
2783         hdr->offset             = cpu_to_be32(datain->offset);
2784
2785         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2786                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2787                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2788                 ntohl(hdr->offset), datain->length, conn->cid);
2789 }
2790 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2791
2792 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2793 {
2794         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2795         struct iscsi_datain datain;
2796         struct iscsi_datain_req *dr;
2797         int eodr = 0, ret;
2798         bool set_statsn = false;
2799
2800         memset(&datain, 0, sizeof(struct iscsi_datain));
2801         dr = iscsit_get_datain_values(cmd, &datain);
2802         if (!dr) {
2803                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2804                                 cmd->init_task_tag);
2805                 return -1;
2806         }
2807         /*
2808          * Be paranoid and double check the logic for now.
2809          */
2810         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2811                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2812                         " datain.length: %u exceeds cmd->data_length: %u\n",
2813                         cmd->init_task_tag, datain.offset, datain.length,
2814                         cmd->se_cmd.data_length);
2815                 return -1;
2816         }
2817
2818         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2819         /*
2820          * Special case for successfully execution w/ both DATAIN
2821          * and Sense Data.
2822          */
2823         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2824             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2825                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2826         else {
2827                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2828                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2829                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2830                         cmd->stat_sn = conn->stat_sn++;
2831                         set_statsn = true;
2832                 } else if (dr->dr_complete ==
2833                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2834                         set_statsn = true;
2835         }
2836
2837         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2838
2839         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2840         if (ret < 0)
2841                 return ret;
2842
2843         if (dr->dr_complete) {
2844                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2845                                 2 : 1;
2846                 iscsit_free_datain_req(cmd, dr);
2847         }
2848
2849         return eodr;
2850 }
2851
2852 int
2853 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2854                         struct iscsi_logout_rsp *hdr)
2855 {
2856         struct iscsi_conn *logout_conn = NULL;
2857         struct iscsi_conn_recovery *cr = NULL;
2858         struct iscsi_session *sess = conn->sess;
2859         /*
2860          * The actual shutting down of Sessions and/or Connections
2861          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2862          * is done in scsi_logout_post_handler().
2863          */
2864         switch (cmd->logout_reason) {
2865         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2866                 pr_debug("iSCSI session logout successful, setting"
2867                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2868                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2869                 break;
2870         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2871                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2872                         break;
2873                 /*
2874                  * For CLOSECONNECTION logout requests carrying
2875                  * a matching logout CID -> local CID, the reference
2876                  * for the local CID will have been incremented in
2877                  * iscsi_logout_closeconnection().
2878                  *
2879                  * For CLOSECONNECTION logout requests carrying
2880                  * a different CID than the connection it arrived
2881                  * on, the connection responding to cmd->logout_cid
2882                  * is stopped in iscsit_logout_post_handler_diffcid().
2883                  */
2884
2885                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2886                         " successful.\n", cmd->logout_cid, conn->cid);
2887                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2888                 break;
2889         case ISCSI_LOGOUT_REASON_RECOVERY:
2890                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2891                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2892                         break;
2893                 /*
2894                  * If the connection is still active from our point of view
2895                  * force connection recovery to occur.
2896                  */
2897                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2898                                 cmd->logout_cid);
2899                 if (logout_conn) {
2900                         iscsit_connection_reinstatement_rcfr(logout_conn);
2901                         iscsit_dec_conn_usage_count(logout_conn);
2902                 }
2903
2904                 cr = iscsit_get_inactive_connection_recovery_entry(
2905                                 conn->sess, cmd->logout_cid);
2906                 if (!cr) {
2907                         pr_err("Unable to locate CID: %hu for"
2908                         " REMOVECONNFORRECOVERY Logout Request.\n",
2909                                 cmd->logout_cid);
2910                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2911                         break;
2912                 }
2913
2914                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2915
2916                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2917                         " for recovery for CID: %hu on CID: %hu successful.\n",
2918                                 cmd->logout_cid, conn->cid);
2919                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2920                 break;
2921         default:
2922                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2923                                 cmd->logout_reason);
2924                 return -1;
2925         }
2926
2927         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2928         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2929         hdr->response           = cmd->logout_response;
2930         hdr->itt                = cmd->init_task_tag;
2931         cmd->stat_sn            = conn->stat_sn++;
2932         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2933
2934         iscsit_increment_maxcmdsn(cmd, conn->sess);
2935         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2936         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2937
2938         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2939                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2940                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2941                 cmd->logout_cid, conn->cid);
2942
2943         return 0;
2944 }
2945 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2946
2947 static int
2948 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2949 {
2950         int rc;
2951
2952         rc = iscsit_build_logout_rsp(cmd, conn,
2953                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2954         if (rc < 0)
2955                 return rc;
2956
2957         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2958 }
2959
2960 void
2961 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2962                        struct iscsi_nopin *hdr, bool nopout_response)
2963 {
2964         hdr->opcode             = ISCSI_OP_NOOP_IN;
2965         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2966         hton24(hdr->dlength, cmd->buf_ptr_size);
2967         if (nopout_response)
2968                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2969         hdr->itt                = cmd->init_task_tag;
2970         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2971         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2972                                   conn->stat_sn;
2973         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2974
2975         if (nopout_response)
2976                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2977
2978         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2979         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2980
2981         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2982                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2983                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2984                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2985 }
2986 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2987
2988 /*
2989  *      Unsolicited NOPIN, either requesting a response or not.
2990  */
2991 static int iscsit_send_unsolicited_nopin(
2992         struct iscsi_cmd *cmd,
2993         struct iscsi_conn *conn,
2994         int want_response)
2995 {
2996         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2997         int ret;
2998
2999         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3000
3001         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3002                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3003
3004         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3005         if (ret < 0)
3006                 return ret;
3007
3008         spin_lock_bh(&cmd->istate_lock);
3009         cmd->i_state = want_response ?
3010                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3011         spin_unlock_bh(&cmd->istate_lock);
3012
3013         return 0;
3014 }
3015
3016 static int
3017 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3018 {
3019         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3020
3021         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3022
3023         /*
3024          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3025          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3026          */
3027         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3028
3029         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3030                                                      cmd->buf_ptr,
3031                                                      cmd->buf_ptr_size);
3032 }
3033
3034 static int iscsit_send_r2t(
3035         struct iscsi_cmd *cmd,
3036         struct iscsi_conn *conn)
3037 {
3038         struct iscsi_r2t *r2t;
3039         struct iscsi_r2t_rsp *hdr;
3040         int ret;
3041
3042         r2t = iscsit_get_r2t_from_list(cmd);
3043         if (!r2t)
3044                 return -1;
3045
3046         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3047         memset(hdr, 0, ISCSI_HDR_LEN);
3048         hdr->opcode             = ISCSI_OP_R2T;
3049         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3050         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3051                         (struct scsi_lun *)&hdr->lun);
3052         hdr->itt                = cmd->init_task_tag;
3053         if (conn->conn_transport->iscsit_get_r2t_ttt)
3054                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3055         else
3056                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3057         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3058         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3059         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3060         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3061         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3062         hdr->data_offset        = cpu_to_be32(r2t->offset);
3063         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3064
3065         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3066                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3067                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3068                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3069                         r2t->offset, r2t->xfer_len, conn->cid);
3070
3071         spin_lock_bh(&cmd->r2t_lock);
3072         r2t->sent_r2t = 1;
3073         spin_unlock_bh(&cmd->r2t_lock);
3074
3075         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3076         if (ret < 0) {
3077                 return ret;
3078         }
3079
3080         spin_lock_bh(&cmd->dataout_timeout_lock);
3081         iscsit_start_dataout_timer(cmd, conn);
3082         spin_unlock_bh(&cmd->dataout_timeout_lock);
3083
3084         return 0;
3085 }
3086
3087 /*
3088  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3089  *              connection recovery.
3090  */
3091 int iscsit_build_r2ts_for_cmd(
3092         struct iscsi_conn *conn,
3093         struct iscsi_cmd *cmd,
3094         bool recovery)
3095 {
3096         int first_r2t = 1;
3097         u32 offset = 0, xfer_len = 0;
3098
3099         spin_lock_bh(&cmd->r2t_lock);
3100         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3101                 spin_unlock_bh(&cmd->r2t_lock);
3102                 return 0;
3103         }
3104
3105         if (conn->sess->sess_ops->DataSequenceInOrder &&
3106             !recovery)
3107                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3108
3109         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3110                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3111                         offset = cmd->r2t_offset;
3112
3113                         if (first_r2t && recovery) {
3114                                 int new_data_end = offset +
3115                                         conn->sess->sess_ops->MaxBurstLength -
3116                                         cmd->next_burst_len;
3117
3118                                 if (new_data_end > cmd->se_cmd.data_length)
3119                                         xfer_len = cmd->se_cmd.data_length - offset;
3120                                 else
3121                                         xfer_len =
3122                                                 conn->sess->sess_ops->MaxBurstLength -
3123                                                 cmd->next_burst_len;
3124                         } else {
3125                                 int new_data_end = offset +
3126                                         conn->sess->sess_ops->MaxBurstLength;
3127
3128                                 if (new_data_end > cmd->se_cmd.data_length)
3129                                         xfer_len = cmd->se_cmd.data_length - offset;
3130                                 else
3131                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3132                         }
3133                         cmd->r2t_offset += xfer_len;
3134
3135                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3136                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137                 } else {
3138                         struct iscsi_seq *seq;
3139
3140                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3141                         if (!seq) {
3142                                 spin_unlock_bh(&cmd->r2t_lock);
3143                                 return -1;
3144                         }
3145
3146                         offset = seq->offset;
3147                         xfer_len = seq->xfer_len;
3148
3149                         if (cmd->seq_send_order == cmd->seq_count)
3150                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3151                 }
3152                 cmd->outstanding_r2ts++;
3153                 first_r2t = 0;
3154
3155                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3156                         spin_unlock_bh(&cmd->r2t_lock);
3157                         return -1;
3158                 }
3159
3160                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3161                         break;
3162         }
3163         spin_unlock_bh(&cmd->r2t_lock);
3164
3165         return 0;
3166 }
3167 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3168
3169 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3170                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3171 {
3172         if (inc_stat_sn)
3173                 cmd->stat_sn = conn->stat_sn++;
3174
3175         atomic_long_inc(&conn->sess->rsp_pdus);
3176
3177         memset(hdr, 0, ISCSI_HDR_LEN);
3178         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3179         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3180         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3181                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3182                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3183         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3184                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3185                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3186         }
3187         hdr->response           = cmd->iscsi_response;
3188         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3189         hdr->itt                = cmd->init_task_tag;
3190         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3191
3192         iscsit_increment_maxcmdsn(cmd, conn->sess);
3193         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3194         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3195
3196         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3197                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3198                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3199                 cmd->se_cmd.scsi_status, conn->cid);
3200 }
3201 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3202
3203 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3204 {
3205         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3206         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3207         void *data_buf = NULL;
3208         u32 padding = 0, data_buf_len = 0;
3209
3210         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3211
3212         /*
3213          * Attach SENSE DATA payload to iSCSI Response PDU
3214          */
3215         if (cmd->se_cmd.sense_buffer &&
3216            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3217             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3218                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3219                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3220
3221                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3222                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3223                 data_buf = cmd->sense_buffer;
3224                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3225
3226                 if (padding) {
3227                         memset(cmd->sense_buffer +
3228                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3229                         pr_debug("Adding %u bytes of padding to"
3230                                 " SENSE.\n", padding);
3231                 }
3232
3233                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3234                                 " Response PDU\n",
3235                                 cmd->se_cmd.scsi_sense_length);
3236         }
3237
3238         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3239                                                      data_buf_len);
3240 }
3241
3242 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3243 {
3244         switch (se_tmr->response) {
3245         case TMR_FUNCTION_COMPLETE:
3246                 return ISCSI_TMF_RSP_COMPLETE;
3247         case TMR_TASK_DOES_NOT_EXIST:
3248                 return ISCSI_TMF_RSP_NO_TASK;
3249         case TMR_LUN_DOES_NOT_EXIST:
3250                 return ISCSI_TMF_RSP_NO_LUN;
3251         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3252                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3253         case TMR_FUNCTION_REJECTED:
3254         default:
3255                 return ISCSI_TMF_RSP_REJECTED;
3256         }
3257 }
3258
3259 void
3260 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3261                           struct iscsi_tm_rsp *hdr)
3262 {
3263         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3264
3265         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3266         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3267         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3268         hdr->itt                = cmd->init_task_tag;
3269         cmd->stat_sn            = conn->stat_sn++;
3270         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3271
3272         iscsit_increment_maxcmdsn(cmd, conn->sess);
3273         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3274         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3275
3276         pr_debug("Built Task Management Response ITT: 0x%08x,"
3277                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3278                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3279 }
3280 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3281
3282 static int
3283 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3284 {
3285         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3286
3287         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3288
3289         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3290 }
3291
3292 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3293 {
3294         bool ret = false;
3295
3296         if (np->np_sockaddr.ss_family == AF_INET6) {
3297                 const struct sockaddr_in6 sin6 = {
3298                         .sin6_addr = IN6ADDR_ANY_INIT };
3299                 struct sockaddr_in6 *sock_in6 =
3300                          (struct sockaddr_in6 *)&np->np_sockaddr;
3301
3302                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3303                                 sin6.sin6_addr.s6_addr, 16))
3304                         ret = true;
3305         } else {
3306                 struct sockaddr_in * sock_in =
3307                         (struct sockaddr_in *)&np->np_sockaddr;
3308
3309                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3310                         ret = true;
3311         }
3312
3313         return ret;
3314 }
3315
3316 #define SENDTARGETS_BUF_LIMIT 32768U
3317
3318 static int
3319 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3320                                   enum iscsit_transport_type network_transport,
3321                                   int skip_bytes, bool *completed)
3322 {
3323         char *payload = NULL;
3324         struct iscsi_conn *conn = cmd->conn;
3325         struct iscsi_portal_group *tpg;
3326         struct iscsi_tiqn *tiqn;
3327         struct iscsi_tpg_np *tpg_np;
3328         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3329         int target_name_printed;
3330         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3331         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3332         bool active;
3333
3334         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3335                          SENDTARGETS_BUF_LIMIT);
3336
3337         payload = kzalloc(buffer_len, GFP_KERNEL);
3338         if (!payload)
3339                 return -ENOMEM;
3340
3341         /*
3342          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3343          * explicit case..
3344          */
3345         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3346                 text_ptr = strchr(text_in, '=');
3347                 if (!text_ptr) {
3348                         pr_err("Unable to locate '=' string in text_in:"
3349                                " %s\n", text_in);
3350                         kfree(payload);
3351                         return -EINVAL;
3352                 }
3353                 /*
3354                  * Skip over '=' character..
3355                  */
3356                 text_ptr += 1;
3357         }
3358
3359         spin_lock(&tiqn_lock);
3360         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3361                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3362                      strcmp(tiqn->tiqn, text_ptr)) {
3363                         continue;
3364                 }
3365
3366                 target_name_printed = 0;
3367
3368                 spin_lock(&tiqn->tiqn_tpg_lock);
3369                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3370
3371                         /* If demo_mode_discovery=0 and generate_node_acls=0
3372                          * (demo mode dislabed) do not return
3373                          * TargetName+TargetAddress unless a NodeACL exists.
3374                          */
3375
3376                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3377                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3378                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3379                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3380                                 continue;
3381                         }
3382
3383                         spin_lock(&tpg->tpg_state_lock);
3384                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3385                         spin_unlock(&tpg->tpg_state_lock);
3386
3387                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3388                                 continue;
3389
3390                         spin_lock(&tpg->tpg_np_lock);
3391                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3392                                                 tpg_np_list) {
3393                                 struct iscsi_np *np = tpg_np->tpg_np;
3394                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3395                                 struct sockaddr_storage *sockaddr;
3396
3397                                 if (np->np_network_transport != network_transport)
3398                                         continue;
3399
3400                                 if (!target_name_printed) {
3401                                         len = sprintf(buf, "TargetName=%s",
3402                                                       tiqn->tiqn);
3403                                         len += 1;
3404
3405                                         if ((len + payload_len) > buffer_len) {
3406                                                 spin_unlock(&tpg->tpg_np_lock);
3407                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3408                                                 end_of_buf = 1;
3409                                                 goto eob;
3410                                         }
3411
3412                                         if (skip_bytes && len <= skip_bytes) {
3413                                                 skip_bytes -= len;
3414                                         } else {
3415                                                 memcpy(payload + payload_len, buf, len);
3416                                                 payload_len += len;
3417                                                 target_name_printed = 1;
3418                                                 if (len > skip_bytes)
3419                                                         skip_bytes = 0;
3420                                         }
3421                                 }
3422
3423                                 if (inaddr_any)
3424                                         sockaddr = &conn->local_sockaddr;
3425                                 else
3426                                         sockaddr = &np->np_sockaddr;
3427
3428                                 len = sprintf(buf, "TargetAddress="
3429                                               "%pISpc,%hu",
3430                                               sockaddr,
3431                                               tpg->tpgt);
3432                                 len += 1;
3433
3434                                 if ((len + payload_len) > buffer_len) {
3435                                         spin_unlock(&tpg->tpg_np_lock);
3436                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3437                                         end_of_buf = 1;
3438                                         goto eob;
3439                                 }
3440
3441                                 if (skip_bytes && len <= skip_bytes) {
3442                                         skip_bytes -= len;
3443                                 } else {
3444                                         memcpy(payload + payload_len, buf, len);
3445                                         payload_len += len;
3446                                         if (len > skip_bytes)
3447                                                 skip_bytes = 0;
3448                                 }
3449                         }
3450                         spin_unlock(&tpg->tpg_np_lock);
3451                 }
3452                 spin_unlock(&tiqn->tiqn_tpg_lock);
3453 eob:
3454                 if (end_of_buf) {
3455                         *completed = false;
3456                         break;
3457                 }
3458
3459                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3460                         break;
3461         }
3462         spin_unlock(&tiqn_lock);
3463
3464         cmd->buf_ptr = payload;
3465
3466         return payload_len;
3467 }
3468
3469 int
3470 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3471                       struct iscsi_text_rsp *hdr,
3472                       enum iscsit_transport_type network_transport)
3473 {
3474         int text_length, padding;
3475         bool completed = true;
3476
3477         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3478                                                         cmd->read_data_done,
3479                                                         &completed);
3480         if (text_length < 0)
3481                 return text_length;
3482
3483         if (completed) {
3484                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3485         } else {
3486                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3487                 cmd->read_data_done += text_length;
3488                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3489                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3490         }
3491         hdr->opcode = ISCSI_OP_TEXT_RSP;
3492         padding = ((-text_length) & 3);
3493         hton24(hdr->dlength, text_length);
3494         hdr->itt = cmd->init_task_tag;
3495         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3496         cmd->stat_sn = conn->stat_sn++;
3497         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3498
3499         iscsit_increment_maxcmdsn(cmd, conn->sess);
3500         /*
3501          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3502          * correctly increment MaxCmdSN for each response answering a
3503          * non immediate text request with a valid CmdSN.
3504          */
3505         cmd->maxcmdsn_inc = 0;
3506         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3507         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3508
3509         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3510                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3511                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3512                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3513                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3514
3515         return text_length + padding;
3516 }
3517 EXPORT_SYMBOL(iscsit_build_text_rsp);
3518
3519 static int iscsit_send_text_rsp(
3520         struct iscsi_cmd *cmd,
3521         struct iscsi_conn *conn)
3522 {
3523         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3524         int text_length;
3525
3526         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3527                                 conn->conn_transport->transport_type);
3528         if (text_length < 0)
3529                 return text_length;
3530
3531         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3532                                                      cmd->buf_ptr,
3533                                                      text_length);
3534 }
3535
3536 void
3537 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3538                     struct iscsi_reject *hdr)
3539 {
3540         hdr->opcode             = ISCSI_OP_REJECT;
3541         hdr->reason             = cmd->reject_reason;
3542         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3543         hton24(hdr->dlength, ISCSI_HDR_LEN);
3544         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3545         cmd->stat_sn            = conn->stat_sn++;
3546         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3547         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3548         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3549
3550 }
3551 EXPORT_SYMBOL(iscsit_build_reject);
3552
3553 static int iscsit_send_reject(
3554         struct iscsi_cmd *cmd,
3555         struct iscsi_conn *conn)
3556 {
3557         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3558
3559         iscsit_build_reject(cmd, conn, hdr);
3560
3561         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3562                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3563
3564         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3565                                                      cmd->buf_ptr,
3566                                                      ISCSI_HDR_LEN);
3567 }
3568
3569 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3570 {
3571         int ord, cpu;
3572         /*
3573          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3574          * within iscsit_start_kthreads()
3575          *
3576          * Here we use bitmap_id to determine which CPU that this
3577          * iSCSI connection's RX/TX threads will be scheduled to
3578          * execute upon.
3579          */
3580         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3581         for_each_online_cpu(cpu) {
3582                 if (ord-- == 0) {
3583                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3584                         return;
3585                 }
3586         }
3587         /*
3588          * This should never be reached..
3589          */
3590         dump_stack();
3591         cpumask_setall(conn->conn_cpumask);
3592 }
3593
3594 int
3595 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3596 {
3597         int ret;
3598
3599         switch (state) {
3600         case ISTATE_SEND_R2T:
3601                 ret = iscsit_send_r2t(cmd, conn);
3602                 if (ret < 0)
3603                         goto err;
3604                 break;
3605         case ISTATE_REMOVE:
3606                 spin_lock_bh(&conn->cmd_lock);
3607                 list_del_init(&cmd->i_conn_node);
3608                 spin_unlock_bh(&conn->cmd_lock);
3609
3610                 iscsit_free_cmd(cmd, false);
3611                 break;
3612         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3613                 iscsit_mod_nopin_response_timer(conn);
3614                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3615                 if (ret < 0)
3616                         goto err;
3617                 break;
3618         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3619                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3620                 if (ret < 0)
3621                         goto err;
3622                 break;
3623         default:
3624                 pr_err("Unknown Opcode: 0x%02x ITT:"
3625                        " 0x%08x, i_state: %d on CID: %hu\n",
3626                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3627                        conn->cid);
3628                 goto err;
3629         }
3630
3631         return 0;
3632
3633 err:
3634         return -1;
3635 }
3636 EXPORT_SYMBOL(iscsit_immediate_queue);
3637
3638 static int
3639 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3640 {
3641         struct iscsit_transport *t = conn->conn_transport;
3642         struct iscsi_queue_req *qr;
3643         struct iscsi_cmd *cmd;
3644         u8 state;
3645         int ret;
3646
3647         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3648                 atomic_set(&conn->check_immediate_queue, 0);
3649                 cmd = qr->cmd;
3650                 state = qr->state;
3651                 kmem_cache_free(lio_qr_cache, qr);
3652
3653                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3654                 if (ret < 0)
3655                         return ret;
3656         }
3657
3658         return 0;
3659 }
3660
3661 int
3662 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3663 {
3664         int ret;
3665
3666 check_rsp_state:
3667         switch (state) {
3668         case ISTATE_SEND_DATAIN:
3669                 ret = iscsit_send_datain(cmd, conn);
3670                 if (ret < 0)
3671                         goto err;
3672                 else if (!ret)
3673                         /* more drs */
3674                         goto check_rsp_state;
3675                 else if (ret == 1) {
3676                         /* all done */
3677                         spin_lock_bh(&cmd->istate_lock);
3678                         cmd->i_state = ISTATE_SENT_STATUS;
3679                         spin_unlock_bh(&cmd->istate_lock);
3680
3681                         if (atomic_read(&conn->check_immediate_queue))
3682                                 return 1;
3683
3684                         return 0;
3685                 } else if (ret == 2) {
3686                         /* Still must send status,
3687                            SCF_TRANSPORT_TASK_SENSE was set */
3688                         spin_lock_bh(&cmd->istate_lock);
3689                         cmd->i_state = ISTATE_SEND_STATUS;
3690                         spin_unlock_bh(&cmd->istate_lock);
3691                         state = ISTATE_SEND_STATUS;
3692                         goto check_rsp_state;
3693                 }
3694
3695                 break;
3696         case ISTATE_SEND_STATUS:
3697         case ISTATE_SEND_STATUS_RECOVERY:
3698                 ret = iscsit_send_response(cmd, conn);
3699                 break;
3700         case ISTATE_SEND_LOGOUTRSP:
3701                 ret = iscsit_send_logout(cmd, conn);
3702                 break;
3703         case ISTATE_SEND_ASYNCMSG:
3704                 ret = iscsit_send_conn_drop_async_message(
3705                         cmd, conn);
3706                 break;
3707         case ISTATE_SEND_NOPIN:
3708                 ret = iscsit_send_nopin(cmd, conn);
3709                 break;
3710         case ISTATE_SEND_REJECT:
3711                 ret = iscsit_send_reject(cmd, conn);
3712                 break;
3713         case ISTATE_SEND_TASKMGTRSP:
3714                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3715                 if (ret != 0)
3716                         break;
3717                 ret = iscsit_tmr_post_handler(cmd, conn);
3718                 if (ret != 0)
3719                         iscsit_fall_back_to_erl0(conn->sess);
3720                 break;
3721         case ISTATE_SEND_TEXTRSP:
3722                 ret = iscsit_send_text_rsp(cmd, conn);
3723                 break;
3724         default:
3725                 pr_err("Unknown Opcode: 0x%02x ITT:"
3726                        " 0x%08x, i_state: %d on CID: %hu\n",
3727                        cmd->iscsi_opcode, cmd->init_task_tag,
3728                        state, conn->cid);
3729                 goto err;
3730         }
3731         if (ret < 0)
3732                 goto err;
3733
3734         switch (state) {
3735         case ISTATE_SEND_LOGOUTRSP:
3736                 if (!iscsit_logout_post_handler(cmd, conn))
3737                         return -ECONNRESET;
3738                 /* fall through */
3739         case ISTATE_SEND_STATUS:
3740         case ISTATE_SEND_ASYNCMSG:
3741         case ISTATE_SEND_NOPIN:
3742         case ISTATE_SEND_STATUS_RECOVERY:
3743         case ISTATE_SEND_TEXTRSP:
3744         case ISTATE_SEND_TASKMGTRSP:
3745         case ISTATE_SEND_REJECT:
3746                 spin_lock_bh(&cmd->istate_lock);
3747                 cmd->i_state = ISTATE_SENT_STATUS;
3748                 spin_unlock_bh(&cmd->istate_lock);
3749                 break;
3750         default:
3751                 pr_err("Unknown Opcode: 0x%02x ITT:"
3752                        " 0x%08x, i_state: %d on CID: %hu\n",
3753                        cmd->iscsi_opcode, cmd->init_task_tag,
3754                        cmd->i_state, conn->cid);
3755                 goto err;
3756         }
3757
3758         if (atomic_read(&conn->check_immediate_queue))
3759                 return 1;
3760
3761         return 0;
3762
3763 err:
3764         return -1;
3765 }
3766 EXPORT_SYMBOL(iscsit_response_queue);
3767
3768 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3769 {
3770         struct iscsit_transport *t = conn->conn_transport;
3771         struct iscsi_queue_req *qr;
3772         struct iscsi_cmd *cmd;
3773         u8 state;
3774         int ret;
3775
3776         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3777                 cmd = qr->cmd;
3778                 state = qr->state;
3779                 kmem_cache_free(lio_qr_cache, qr);
3780
3781                 ret = t->iscsit_response_queue(conn, cmd, state);
3782                 if (ret == 1 || ret < 0)
3783                         return ret;
3784         }
3785
3786         return 0;
3787 }
3788
3789 int iscsi_target_tx_thread(void *arg)
3790 {
3791         int ret = 0;
3792         struct iscsi_conn *conn = arg;
3793         bool conn_freed = false;
3794
3795         /*
3796          * Allow ourselves to be interrupted by SIGINT so that a
3797          * connection recovery / failure event can be triggered externally.
3798          */
3799         allow_signal(SIGINT);
3800
3801         while (!kthread_should_stop()) {
3802                 /*
3803                  * Ensure that both TX and RX per connection kthreads
3804                  * are scheduled to run on the same CPU.
3805                  */
3806                 iscsit_thread_check_cpumask(conn, current, 1);
3807
3808                 wait_event_interruptible(conn->queues_wq,
3809                                          !iscsit_conn_all_queues_empty(conn));
3810
3811                 if (signal_pending(current))
3812                         goto transport_err;
3813
3814 get_immediate:
3815                 ret = iscsit_handle_immediate_queue(conn);
3816                 if (ret < 0)
3817                         goto transport_err;
3818
3819                 ret = iscsit_handle_response_queue(conn);
3820                 if (ret == 1) {
3821                         goto get_immediate;
3822                 } else if (ret == -ECONNRESET) {
3823                         conn_freed = true;
3824                         goto out;
3825                 } else if (ret < 0) {
3826                         goto transport_err;
3827                 }
3828         }
3829
3830 transport_err:
3831         /*
3832          * Avoid the normal connection failure code-path if this connection
3833          * is still within LOGIN mode, and iscsi_np process context is
3834          * responsible for cleaning up the early connection failure.
3835          */
3836         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3837                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3838 out:
3839         if (!conn_freed) {
3840                 while (!kthread_should_stop()) {
3841                         msleep(100);
3842                 }
3843         }
3844         return 0;
3845 }
3846
3847 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3848 {
3849         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3850         struct iscsi_cmd *cmd;
3851         int ret = 0;
3852
3853         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3854         case ISCSI_OP_SCSI_CMD:
3855                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3856                 if (!cmd)
3857                         goto reject;
3858
3859                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3860                 break;
3861         case ISCSI_OP_SCSI_DATA_OUT:
3862                 ret = iscsit_handle_data_out(conn, buf);
3863                 break;
3864         case ISCSI_OP_NOOP_OUT:
3865                 cmd = NULL;
3866                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3867                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3868                         if (!cmd)
3869                                 goto reject;
3870                 }
3871                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3872                 break;
3873         case ISCSI_OP_SCSI_TMFUNC:
3874                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3875                 if (!cmd)
3876                         goto reject;
3877
3878                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3879                 break;
3880         case ISCSI_OP_TEXT:
3881                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3882                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3883                         if (!cmd)
3884                                 goto reject;
3885                 } else {
3886                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3887                         if (!cmd)
3888                                 goto reject;
3889                 }
3890
3891                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3892                 break;
3893         case ISCSI_OP_LOGOUT:
3894                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3895                 if (!cmd)
3896                         goto reject;
3897
3898                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3899                 if (ret > 0)
3900                         wait_for_completion_timeout(&conn->conn_logout_comp,
3901                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3902                 break;
3903         case ISCSI_OP_SNACK:
3904                 ret = iscsit_handle_snack(conn, buf);
3905                 break;
3906         default:
3907                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3908                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3909                         pr_err("Cannot recover from unknown"
3910                         " opcode while ERL=0, closing iSCSI connection.\n");
3911                         return -1;
3912                 }
3913                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3914                        " closing iSCSI connection.\n");
3915                 ret = -1;
3916                 break;
3917         }
3918
3919         return ret;
3920 reject:
3921         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3922 }
3923
3924 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3925 {
3926         bool ret;
3927
3928         spin_lock_bh(&conn->state_lock);
3929         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3930         spin_unlock_bh(&conn->state_lock);
3931
3932         return ret;
3933 }
3934
3935 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3936 {
3937         int ret;
3938         u8 buffer[ISCSI_HDR_LEN], opcode;
3939         u32 checksum = 0, digest = 0;
3940         struct kvec iov;
3941
3942         while (!kthread_should_stop()) {
3943                 /*
3944                  * Ensure that both TX and RX per connection kthreads
3945                  * are scheduled to run on the same CPU.
3946                  */
3947                 iscsit_thread_check_cpumask(conn, current, 0);
3948
3949                 memset(buffer, 0, ISCSI_HDR_LEN);
3950                 memset(&iov, 0, sizeof(struct kvec));
3951
3952                 iov.iov_base    = buffer;
3953                 iov.iov_len     = ISCSI_HDR_LEN;
3954
3955                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3956                 if (ret != ISCSI_HDR_LEN) {
3957                         iscsit_rx_thread_wait_for_tcp(conn);
3958                         return;
3959                 }
3960
3961                 if (conn->conn_ops->HeaderDigest) {
3962                         iov.iov_base    = &digest;
3963                         iov.iov_len     = ISCSI_CRC_LEN;
3964
3965                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3966                         if (ret != ISCSI_CRC_LEN) {
3967                                 iscsit_rx_thread_wait_for_tcp(conn);
3968                                 return;
3969                         }
3970
3971                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3972                                         buffer, ISCSI_HDR_LEN,
3973                                         0, NULL, (u8 *)&checksum);
3974
3975                         if (digest != checksum) {
3976                                 pr_err("HeaderDigest CRC32C failed,"
3977                                         " received 0x%08x, computed 0x%08x\n",
3978                                         digest, checksum);
3979                                 /*
3980                                  * Set the PDU to 0xff so it will intentionally
3981                                  * hit default in the switch below.
3982                                  */
3983                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3984                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3985                         } else {
3986                                 pr_debug("Got HeaderDigest CRC32C"
3987                                                 " 0x%08x\n", checksum);
3988                         }
3989                 }
3990
3991                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3992                         return;
3993
3994                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3995
3996                 if (conn->sess->sess_ops->SessionType &&
3997                    ((!(opcode & ISCSI_OP_TEXT)) ||
3998                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3999                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4000                         " while in Discovery Session, rejecting.\n", opcode);
4001                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4002                                           buffer);
4003                         return;
4004                 }
4005
4006                 ret = iscsi_target_rx_opcode(conn, buffer);
4007                 if (ret < 0)
4008                         return;
4009         }
4010 }
4011
4012 int iscsi_target_rx_thread(void *arg)
4013 {
4014         int rc;
4015         struct iscsi_conn *conn = arg;
4016         bool conn_freed = false;
4017
4018         /*
4019          * Allow ourselves to be interrupted by SIGINT so that a
4020          * connection recovery / failure event can be triggered externally.
4021          */
4022         allow_signal(SIGINT);
4023         /*
4024          * Wait for iscsi_post_login_handler() to complete before allowing
4025          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4026          */
4027         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4028         if (rc < 0 || iscsi_target_check_conn_state(conn))
4029                 goto out;
4030
4031         if (!conn->conn_transport->iscsit_get_rx_pdu)
4032                 return 0;
4033
4034         conn->conn_transport->iscsit_get_rx_pdu(conn);
4035
4036         if (!signal_pending(current))
4037                 atomic_set(&conn->transport_failed, 1);
4038         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4039
4040 out:
4041         if (!conn_freed) {
4042                 while (!kthread_should_stop()) {
4043                         msleep(100);
4044                 }
4045         }
4046
4047         return 0;
4048 }
4049
4050 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4051 {
4052         LIST_HEAD(tmp_list);
4053         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4054         struct iscsi_session *sess = conn->sess;
4055         /*
4056          * We expect this function to only ever be called from either RX or TX
4057          * thread context via iscsit_close_connection() once the other context
4058          * has been reset -> returned sleeping pre-handler state.
4059          */
4060         spin_lock_bh(&conn->cmd_lock);
4061         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4062
4063         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4064                 struct se_cmd *se_cmd = &cmd->se_cmd;
4065
4066                 if (se_cmd->se_tfo != NULL) {
4067                         spin_lock(&se_cmd->t_state_lock);
4068                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4069                         spin_unlock(&se_cmd->t_state_lock);
4070                 }
4071         }
4072         spin_unlock_bh(&conn->cmd_lock);
4073
4074         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4075                 list_del_init(&cmd->i_conn_node);
4076
4077                 iscsit_increment_maxcmdsn(cmd, sess);
4078                 iscsit_free_cmd(cmd, true);
4079
4080         }
4081 }
4082
4083 static void iscsit_stop_timers_for_cmds(
4084         struct iscsi_conn *conn)
4085 {
4086         struct iscsi_cmd *cmd;
4087
4088         spin_lock_bh(&conn->cmd_lock);
4089         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4090                 if (cmd->data_direction == DMA_TO_DEVICE)
4091                         iscsit_stop_dataout_timer(cmd);
4092         }
4093         spin_unlock_bh(&conn->cmd_lock);
4094 }
4095
4096 int iscsit_close_connection(
4097         struct iscsi_conn *conn)
4098 {
4099         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4100         struct iscsi_session    *sess = conn->sess;
4101
4102         pr_debug("Closing iSCSI connection CID %hu on SID:"
4103                 " %u\n", conn->cid, sess->sid);
4104         /*
4105          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4106          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4107          * sleeping and the logout response never got sent because the
4108          * connection failed.
4109          *
4110          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4111          * to signal logout response TX interrupt completion.  Go ahead and skip
4112          * this for iser since isert_rx_opcode() does not wait on logout failure,
4113          * and to avoid iscsi_conn pointer dereference in iser-target code.
4114          */
4115         if (!conn->conn_transport->rdma_shutdown)
4116                 complete(&conn->conn_logout_comp);
4117
4118         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4119                 if (conn->tx_thread &&
4120                     cmpxchg(&conn->tx_thread_active, true, false)) {
4121                         send_sig(SIGINT, conn->tx_thread, 1);
4122                         kthread_stop(conn->tx_thread);
4123                 }
4124         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4125                 if (conn->rx_thread &&
4126                     cmpxchg(&conn->rx_thread_active, true, false)) {
4127                         send_sig(SIGINT, conn->rx_thread, 1);
4128                         kthread_stop(conn->rx_thread);
4129                 }
4130         }
4131
4132         spin_lock(&iscsit_global->ts_bitmap_lock);
4133         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4134                               get_order(1));
4135         spin_unlock(&iscsit_global->ts_bitmap_lock);
4136
4137         iscsit_stop_timers_for_cmds(conn);
4138         iscsit_stop_nopin_response_timer(conn);
4139         iscsit_stop_nopin_timer(conn);
4140
4141         if (conn->conn_transport->iscsit_wait_conn)
4142                 conn->conn_transport->iscsit_wait_conn(conn);
4143
4144         /*
4145          * During Connection recovery drop unacknowledged out of order
4146          * commands for this connection, and prepare the other commands
4147          * for reallegiance.
4148          *
4149          * During normal operation clear the out of order commands (but
4150          * do not free the struct iscsi_ooo_cmdsn's) and release all
4151          * struct iscsi_cmds.
4152          */
4153         if (atomic_read(&conn->connection_recovery)) {
4154                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4155                 iscsit_prepare_cmds_for_reallegiance(conn);
4156         } else {
4157                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4158                 iscsit_release_commands_from_conn(conn);
4159         }
4160         iscsit_free_queue_reqs_for_conn(conn);
4161
4162         /*
4163          * Handle decrementing session or connection usage count if
4164          * a logout response was not able to be sent because the
4165          * connection failed.  Fall back to Session Recovery here.
4166          */
4167         if (atomic_read(&conn->conn_logout_remove)) {
4168                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4169                         iscsit_dec_conn_usage_count(conn);
4170                         iscsit_dec_session_usage_count(sess);
4171                 }
4172                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4173                         iscsit_dec_conn_usage_count(conn);
4174
4175                 atomic_set(&conn->conn_logout_remove, 0);
4176                 atomic_set(&sess->session_reinstatement, 0);
4177                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4178         }
4179
4180         spin_lock_bh(&sess->conn_lock);
4181         list_del(&conn->conn_list);
4182
4183         /*
4184          * Attempt to let the Initiator know this connection failed by
4185          * sending an Connection Dropped Async Message on another
4186          * active connection.
4187          */
4188         if (atomic_read(&conn->connection_recovery))
4189                 iscsit_build_conn_drop_async_message(conn);
4190
4191         spin_unlock_bh(&sess->conn_lock);
4192
4193         /*
4194          * If connection reinstatement is being performed on this connection,
4195          * up the connection reinstatement semaphore that is being blocked on
4196          * in iscsit_cause_connection_reinstatement().
4197          */
4198         spin_lock_bh(&conn->state_lock);
4199         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4200                 spin_unlock_bh(&conn->state_lock);
4201                 complete(&conn->conn_wait_comp);
4202                 wait_for_completion(&conn->conn_post_wait_comp);
4203                 spin_lock_bh(&conn->state_lock);
4204         }
4205
4206         /*
4207          * If connection reinstatement is being performed on this connection
4208          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4209          * connection wait rcfr semaphore that is being blocked on
4210          * an iscsit_connection_reinstatement_rcfr().
4211          */
4212         if (atomic_read(&conn->connection_wait_rcfr)) {
4213                 spin_unlock_bh(&conn->state_lock);
4214                 complete(&conn->conn_wait_rcfr_comp);
4215                 wait_for_completion(&conn->conn_post_wait_comp);
4216                 spin_lock_bh(&conn->state_lock);
4217         }
4218         atomic_set(&conn->connection_reinstatement, 1);
4219         spin_unlock_bh(&conn->state_lock);
4220
4221         /*
4222          * If any other processes are accessing this connection pointer we
4223          * must wait until they have completed.
4224          */
4225         iscsit_check_conn_usage_count(conn);
4226
4227         ahash_request_free(conn->conn_tx_hash);
4228         if (conn->conn_rx_hash) {
4229                 struct crypto_ahash *tfm;
4230
4231                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4232                 ahash_request_free(conn->conn_rx_hash);
4233                 crypto_free_ahash(tfm);
4234         }
4235
4236         free_cpumask_var(conn->conn_cpumask);
4237
4238         kfree(conn->conn_ops);
4239         conn->conn_ops = NULL;
4240
4241         if (conn->sock)
4242                 sock_release(conn->sock);
4243
4244         if (conn->conn_transport->iscsit_free_conn)
4245                 conn->conn_transport->iscsit_free_conn(conn);
4246
4247         iscsit_put_transport(conn->conn_transport);
4248
4249         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4250         conn->conn_state = TARG_CONN_STATE_FREE;
4251         kfree(conn);
4252
4253         spin_lock_bh(&sess->conn_lock);
4254         atomic_dec(&sess->nconn);
4255         pr_debug("Decremented iSCSI connection count to %hu from node:"
4256                 " %s\n", atomic_read(&sess->nconn),
4257                 sess->sess_ops->InitiatorName);
4258         /*
4259          * Make sure that if one connection fails in an non ERL=2 iSCSI
4260          * Session that they all fail.
4261          */
4262         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4263              !atomic_read(&sess->session_logout))
4264                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4265
4266         /*
4267          * If this was not the last connection in the session, and we are
4268          * performing session reinstatement or falling back to ERL=0, call
4269          * iscsit_stop_session() without sleeping to shutdown the other
4270          * active connections.
4271          */
4272         if (atomic_read(&sess->nconn)) {
4273                 if (!atomic_read(&sess->session_reinstatement) &&
4274                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4275                         spin_unlock_bh(&sess->conn_lock);
4276                         return 0;
4277                 }
4278                 if (!atomic_read(&sess->session_stop_active)) {
4279                         atomic_set(&sess->session_stop_active, 1);
4280                         spin_unlock_bh(&sess->conn_lock);
4281                         iscsit_stop_session(sess, 0, 0);
4282                         return 0;
4283                 }
4284                 spin_unlock_bh(&sess->conn_lock);
4285                 return 0;
4286         }
4287
4288         /*
4289          * If this was the last connection in the session and one of the
4290          * following is occurring:
4291          *
4292          * Session Reinstatement is not being performed, and are falling back
4293          * to ERL=0 call iscsit_close_session().
4294          *
4295          * Session Logout was requested.  iscsit_close_session() will be called
4296          * elsewhere.
4297          *
4298          * Session Continuation is not being performed, start the Time2Retain
4299          * handler and check if sleep_on_sess_wait_sem is active.
4300          */
4301         if (!atomic_read(&sess->session_reinstatement) &&
4302              atomic_read(&sess->session_fall_back_to_erl0)) {
4303                 spin_unlock_bh(&sess->conn_lock);
4304                 iscsit_close_session(sess);
4305
4306                 return 0;
4307         } else if (atomic_read(&sess->session_logout)) {
4308                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4309                 sess->session_state = TARG_SESS_STATE_FREE;
4310                 spin_unlock_bh(&sess->conn_lock);
4311
4312                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4313                         complete(&sess->session_wait_comp);
4314
4315                 return 0;
4316         } else {
4317                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4318                 sess->session_state = TARG_SESS_STATE_FAILED;
4319
4320                 if (!atomic_read(&sess->session_continuation)) {
4321                         spin_unlock_bh(&sess->conn_lock);
4322                         iscsit_start_time2retain_handler(sess);
4323                 } else
4324                         spin_unlock_bh(&sess->conn_lock);
4325
4326                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4327                         complete(&sess->session_wait_comp);
4328
4329                 return 0;
4330         }
4331 }
4332
4333 /*
4334  * If the iSCSI Session for the iSCSI Initiator Node exists,
4335  * forcefully shutdown the iSCSI NEXUS.
4336  */
4337 int iscsit_close_session(struct iscsi_session *sess)
4338 {
4339         struct iscsi_portal_group *tpg = sess->tpg;
4340         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4341
4342         if (atomic_read(&sess->nconn)) {
4343                 pr_err("%d connection(s) still exist for iSCSI session"
4344                         " to %s\n", atomic_read(&sess->nconn),
4345                         sess->sess_ops->InitiatorName);
4346                 BUG();
4347         }
4348
4349         spin_lock_bh(&se_tpg->session_lock);
4350         atomic_set(&sess->session_logout, 1);
4351         atomic_set(&sess->session_reinstatement, 1);
4352         iscsit_stop_time2retain_timer(sess);
4353         spin_unlock_bh(&se_tpg->session_lock);
4354
4355         /*
4356          * transport_deregister_session_configfs() will clear the
4357          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4358          * can be setting it again with __transport_register_session() in
4359          * iscsi_post_login_handler() again after the iscsit_stop_session()
4360          * completes in iscsi_np context.
4361          */
4362         transport_deregister_session_configfs(sess->se_sess);
4363
4364         /*
4365          * If any other processes are accessing this session pointer we must
4366          * wait until they have completed.  If we are in an interrupt (the
4367          * time2retain handler) and contain and active session usage count we
4368          * restart the timer and exit.
4369          */
4370         if (!in_interrupt()) {
4371                 if (iscsit_check_session_usage_count(sess) == 1)
4372                         iscsit_stop_session(sess, 1, 1);
4373         } else {
4374                 if (iscsit_check_session_usage_count(sess) == 2) {
4375                         atomic_set(&sess->session_logout, 0);
4376                         iscsit_start_time2retain_handler(sess);
4377                         return 0;
4378                 }
4379         }
4380
4381         transport_deregister_session(sess->se_sess);
4382
4383         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4384                 iscsit_free_connection_recovery_entires(sess);
4385
4386         iscsit_free_all_ooo_cmdsns(sess);
4387
4388         spin_lock_bh(&se_tpg->session_lock);
4389         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4390         sess->session_state = TARG_SESS_STATE_FREE;
4391         pr_debug("Released iSCSI session from node: %s\n",
4392                         sess->sess_ops->InitiatorName);
4393         tpg->nsessions--;
4394         if (tpg->tpg_tiqn)
4395                 tpg->tpg_tiqn->tiqn_nsessions--;
4396
4397         pr_debug("Decremented number of active iSCSI Sessions on"
4398                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4399
4400         spin_lock(&sess_idr_lock);
4401         idr_remove(&sess_idr, sess->session_index);
4402         spin_unlock(&sess_idr_lock);
4403
4404         kfree(sess->sess_ops);
4405         sess->sess_ops = NULL;
4406         spin_unlock_bh(&se_tpg->session_lock);
4407
4408         kfree(sess);
4409         return 0;
4410 }
4411
4412 static void iscsit_logout_post_handler_closesession(
4413         struct iscsi_conn *conn)
4414 {
4415         struct iscsi_session *sess = conn->sess;
4416         int sleep = 1;
4417         /*
4418          * Traditional iscsi/tcp will invoke this logic from TX thread
4419          * context during session logout, so clear tx_thread_active and
4420          * sleep if iscsit_close_connection() has not already occured.
4421          *
4422          * Since iser-target invokes this logic from it's own workqueue,
4423          * always sleep waiting for RX/TX thread shutdown to complete
4424          * within iscsit_close_connection().
4425          */
4426         if (!conn->conn_transport->rdma_shutdown)
4427                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4428
4429         atomic_set(&conn->conn_logout_remove, 0);
4430         complete(&conn->conn_logout_comp);
4431
4432         iscsit_dec_conn_usage_count(conn);
4433         iscsit_stop_session(sess, sleep, sleep);
4434         iscsit_dec_session_usage_count(sess);
4435         iscsit_close_session(sess);
4436 }
4437
4438 static void iscsit_logout_post_handler_samecid(
4439         struct iscsi_conn *conn)
4440 {
4441         int sleep = 1;
4442
4443         if (!conn->conn_transport->rdma_shutdown)
4444                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4445
4446         atomic_set(&conn->conn_logout_remove, 0);
4447         complete(&conn->conn_logout_comp);
4448
4449         iscsit_cause_connection_reinstatement(conn, sleep);
4450         iscsit_dec_conn_usage_count(conn);
4451 }
4452
4453 static void iscsit_logout_post_handler_diffcid(
4454         struct iscsi_conn *conn,
4455         u16 cid)
4456 {
4457         struct iscsi_conn *l_conn;
4458         struct iscsi_session *sess = conn->sess;
4459         bool conn_found = false;
4460
4461         if (!sess)
4462                 return;
4463
4464         spin_lock_bh(&sess->conn_lock);
4465         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4466                 if (l_conn->cid == cid) {
4467                         iscsit_inc_conn_usage_count(l_conn);
4468                         conn_found = true;
4469                         break;
4470                 }
4471         }
4472         spin_unlock_bh(&sess->conn_lock);
4473
4474         if (!conn_found)
4475                 return;
4476
4477         if (l_conn->sock)
4478                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4479
4480         spin_lock_bh(&l_conn->state_lock);
4481         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4482         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4483         spin_unlock_bh(&l_conn->state_lock);
4484
4485         iscsit_cause_connection_reinstatement(l_conn, 1);
4486         iscsit_dec_conn_usage_count(l_conn);
4487 }
4488
4489 /*
4490  *      Return of 0 causes the TX thread to restart.
4491  */
4492 int iscsit_logout_post_handler(
4493         struct iscsi_cmd *cmd,
4494         struct iscsi_conn *conn)
4495 {
4496         int ret = 0;
4497
4498         switch (cmd->logout_reason) {
4499         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4500                 switch (cmd->logout_response) {
4501                 case ISCSI_LOGOUT_SUCCESS:
4502                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4503                 default:
4504                         iscsit_logout_post_handler_closesession(conn);
4505                         break;
4506                 }
4507                 ret = 0;
4508                 break;
4509         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4510                 if (conn->cid == cmd->logout_cid) {
4511                         switch (cmd->logout_response) {
4512                         case ISCSI_LOGOUT_SUCCESS:
4513                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4514                         default:
4515                                 iscsit_logout_post_handler_samecid(conn);
4516                                 break;
4517                         }
4518                         ret = 0;
4519                 } else {
4520                         switch (cmd->logout_response) {
4521                         case ISCSI_LOGOUT_SUCCESS:
4522                                 iscsit_logout_post_handler_diffcid(conn,
4523                                         cmd->logout_cid);
4524                                 break;
4525                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4526                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4527                         default:
4528                                 break;
4529                         }
4530                         ret = 1;
4531                 }
4532                 break;
4533         case ISCSI_LOGOUT_REASON_RECOVERY:
4534                 switch (cmd->logout_response) {
4535                 case ISCSI_LOGOUT_SUCCESS:
4536                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4537                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4538                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4539                 default:
4540                         break;
4541                 }
4542                 ret = 1;
4543                 break;
4544         default:
4545                 break;
4546
4547         }
4548         return ret;
4549 }
4550 EXPORT_SYMBOL(iscsit_logout_post_handler);
4551
4552 void iscsit_fail_session(struct iscsi_session *sess)
4553 {
4554         struct iscsi_conn *conn;
4555
4556         spin_lock_bh(&sess->conn_lock);
4557         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4558                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4559                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4560         }
4561         spin_unlock_bh(&sess->conn_lock);
4562
4563         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4564         sess->session_state = TARG_SESS_STATE_FAILED;
4565 }
4566
4567 int iscsit_free_session(struct iscsi_session *sess)
4568 {
4569         u16 conn_count = atomic_read(&sess->nconn);
4570         struct iscsi_conn *conn, *conn_tmp = NULL;
4571         int is_last;
4572
4573         spin_lock_bh(&sess->conn_lock);
4574         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4575
4576         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4577                         conn_list) {
4578                 if (conn_count == 0)
4579                         break;
4580
4581                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4582                         is_last = 1;
4583                 } else {
4584                         iscsit_inc_conn_usage_count(conn_tmp);
4585                         is_last = 0;
4586                 }
4587                 iscsit_inc_conn_usage_count(conn);
4588
4589                 spin_unlock_bh(&sess->conn_lock);
4590                 iscsit_cause_connection_reinstatement(conn, 1);
4591                 spin_lock_bh(&sess->conn_lock);
4592
4593                 iscsit_dec_conn_usage_count(conn);
4594                 if (is_last == 0)
4595                         iscsit_dec_conn_usage_count(conn_tmp);
4596
4597                 conn_count--;
4598         }
4599
4600         if (atomic_read(&sess->nconn)) {
4601                 spin_unlock_bh(&sess->conn_lock);
4602                 wait_for_completion(&sess->session_wait_comp);
4603         } else
4604                 spin_unlock_bh(&sess->conn_lock);
4605
4606         iscsit_close_session(sess);
4607         return 0;
4608 }
4609
4610 void iscsit_stop_session(
4611         struct iscsi_session *sess,
4612         int session_sleep,
4613         int connection_sleep)
4614 {
4615         u16 conn_count = atomic_read(&sess->nconn);
4616         struct iscsi_conn *conn, *conn_tmp = NULL;
4617         int is_last;
4618
4619         spin_lock_bh(&sess->conn_lock);
4620         if (session_sleep)
4621                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4622
4623         if (connection_sleep) {
4624                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4625                                 conn_list) {
4626                         if (conn_count == 0)
4627                                 break;
4628
4629                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4630                                 is_last = 1;
4631                         } else {
4632                                 iscsit_inc_conn_usage_count(conn_tmp);
4633                                 is_last = 0;
4634                         }
4635                         iscsit_inc_conn_usage_count(conn);
4636
4637                         spin_unlock_bh(&sess->conn_lock);
4638                         iscsit_cause_connection_reinstatement(conn, 1);
4639                         spin_lock_bh(&sess->conn_lock);
4640
4641                         iscsit_dec_conn_usage_count(conn);
4642                         if (is_last == 0)
4643                                 iscsit_dec_conn_usage_count(conn_tmp);
4644                         conn_count--;
4645                 }
4646         } else {
4647                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4648                         iscsit_cause_connection_reinstatement(conn, 0);
4649         }
4650
4651         if (session_sleep && atomic_read(&sess->nconn)) {
4652                 spin_unlock_bh(&sess->conn_lock);
4653                 wait_for_completion(&sess->session_wait_comp);
4654         } else
4655                 spin_unlock_bh(&sess->conn_lock);
4656 }
4657
4658 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4659 {
4660         struct iscsi_session *sess;
4661         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4662         struct se_session *se_sess, *se_sess_tmp;
4663         LIST_HEAD(free_list);
4664         int session_count = 0;
4665
4666         spin_lock_bh(&se_tpg->session_lock);
4667         if (tpg->nsessions && !force) {
4668                 spin_unlock_bh(&se_tpg->session_lock);
4669                 return -1;
4670         }
4671
4672         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4673                         sess_list) {
4674                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4675
4676                 spin_lock(&sess->conn_lock);
4677                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4678                     atomic_read(&sess->session_logout) ||
4679                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4680                         spin_unlock(&sess->conn_lock);
4681                         continue;
4682                 }
4683                 atomic_set(&sess->session_reinstatement, 1);
4684                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4685                 spin_unlock(&sess->conn_lock);
4686
4687                 list_move_tail(&se_sess->sess_list, &free_list);
4688         }
4689         spin_unlock_bh(&se_tpg->session_lock);
4690
4691         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4692                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4693
4694                 iscsit_free_session(sess);
4695                 session_count++;
4696         }
4697
4698         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4699                         " Group: %hu\n", session_count, tpg->tpgt);
4700         return 0;
4701 }
4702
4703 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4704 MODULE_VERSION("4.1.x");
4705 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4706 MODULE_LICENSE("GPL");
4707
4708 module_init(iscsi_target_init_module);
4709 module_exit(iscsi_target_cleanup_module);