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         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 376
 377         ret = iscsi_target_setup_login_socket(np, sockaddr);
 378         if (ret != 0) {
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 mutex_unlock(&np_lock);
 390                 return ERR_PTR(ret);
 391         }
 392         /*
 393          * Increment the np_exports reference count now to prevent
 394          * iscsit_del_np() below from being run while a new call to
 395          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 396          * active.  We don't need to hold np->np_thread_lock at this
 397          * point because iscsi_np has not been added to g_np_list yet.
 398          */
 399         np->np_exports = 1;
 400         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 401
 402         list_add_tail(&np->np_list, &g_np_list);
 403         mutex_unlock(&np_lock);
 404
 405         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 406                 &np->np_sockaddr, np->np_transport->name);
 407
 408         return np;
 409 }
 410
 411 int iscsit_reset_np_thread(
 412         struct iscsi_np *np,
 413         struct iscsi_tpg_np *tpg_np,
 414         struct iscsi_portal_group *tpg,
 415         bool shutdown)
 416 {
 417         spin_lock_bh(&np->np_thread_lock);
 418         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 419                 spin_unlock_bh(&np->np_thread_lock);
 420                 return 0;
 421         }
 422         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 423         atomic_inc(&np->np_reset_count);
 424
 425         if (np->np_thread) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 send_sig(SIGINT, np->np_thread, 1);
 428                 wait_for_completion(&np->np_restart_comp);
 429                 spin_lock_bh(&np->np_thread_lock);
 430         }
 431         spin_unlock_bh(&np->np_thread_lock);
 432
 433         if (tpg_np && shutdown) {
 434                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 435
 436                 wait_for_completion(&tpg_np->tpg_np_comp);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static void iscsit_free_np(struct iscsi_np *np)
 443 {
 444         if (np->np_socket)
 445                 sock_release(np->np_socket);
 446 }
 447
 448 int iscsit_del_np(struct iscsi_np *np)
 449 {
 450         spin_lock_bh(&np->np_thread_lock);
 451         np->np_exports--;
 452         if (np->np_exports) {
 453                 np->enabled = true;
 454                 spin_unlock_bh(&np->np_thread_lock);
 455                 return 0;
 456         }
 457         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 458         spin_unlock_bh(&np->np_thread_lock);
 459
 460         if (np->np_thread) {
 461                 /*
 462                  * We need to send the signal to wakeup Linux/Net
 463                  * which may be sleeping in sock_accept()..
 464                  */
 465                 send_sig(SIGINT, np->np_thread, 1);
 466                 kthread_stop(np->np_thread);
 467                 np->np_thread = NULL;
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         mutex_lock(&np_lock);
 473         list_del(&np->np_list);
 474         mutex_unlock(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 477                 &np->np_sockaddr, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 485
 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 487 {
 488         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 489 }
 490 EXPORT_SYMBOL(iscsit_queue_rsp);
 491
 492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 493 {
 494         spin_lock_bh(&conn->cmd_lock);
 495         if (!list_empty(&cmd->i_conn_node) &&
 496             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 497                 list_del_init(&cmd->i_conn_node);
 498         spin_unlock_bh(&conn->cmd_lock);
 499
 500         __iscsit_free_cmd(cmd, true);
 501 }
 502 EXPORT_SYMBOL(iscsit_aborted_task);
 503
 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 505                                       u32, u32, u8 *, u8 *);
 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 507
 508 static int
 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 510                           const void *data_buf, u32 data_buf_len)
 511 {
 512         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 513         struct kvec *iov;
 514         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 515         int ret;
 516
 517         iov = &cmd->iov_misc[0];
 518         iov[niov].iov_base      = cmd->pdu;
 519         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 520
 521         if (conn->conn_ops->HeaderDigest) {
 522                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 523
 524                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 525                                           ISCSI_HDR_LEN, 0, NULL,
 526                                           (u8 *)header_digest);
 527
 528                 iov[0].iov_len += ISCSI_CRC_LEN;
 529                 tx_size += ISCSI_CRC_LEN;
 530                 pr_debug("Attaching CRC32C HeaderDigest"
 531                          " to opcode 0x%x 0x%08x\n",
 532                          hdr->opcode, *header_digest);
 533         }
 534
 535         if (data_buf_len) {
 536                 u32 padding = ((-data_buf_len) & 3);
 537
 538                 iov[niov].iov_base      = (void *)data_buf;
 539                 iov[niov++].iov_len     = data_buf_len;
 540                 tx_size += data_buf_len;
 541
 542                 if (padding != 0) {
 543                         iov[niov].iov_base = &cmd->pad_bytes;
 544                         iov[niov++].iov_len = padding;
 545                         tx_size += padding;
 546                         pr_debug("Attaching %u additional"
 547                                  " padding bytes.\n", padding);
 548                 }
 549
 550                 if (conn->conn_ops->DataDigest) {
 551                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 552                                                   data_buf, data_buf_len,
 553                                                   padding,
 554                                                   (u8 *)&cmd->pad_bytes,
 555                                                   (u8 *)&cmd->data_crc);
 556
 557                         iov[niov].iov_base = &cmd->data_crc;
 558                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 559                         tx_size += ISCSI_CRC_LEN;
 560                         pr_debug("Attached DataDigest for %u"
 561                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 562                                  data_buf_len, hdr->opcode, cmd->data_crc);
 563                 }
 564         }
 565
 566         cmd->iov_misc_count = niov;
 567         cmd->tx_size = tx_size;
 568
 569         ret = iscsit_send_tx_data(cmd, conn, 1);
 570         if (ret < 0) {
 571                 iscsit_tx_thread_wait_for_tcp(conn);
 572                 return ret;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 581                                     u32, u32, u32, u8 *);
 582 static int
 583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 584                        const struct iscsi_datain *datain)
 585 {
 586         struct kvec *iov;
 587         u32 iov_count = 0, tx_size = 0;
 588         int ret, iov_ret;
 589
 590         iov = &cmd->iov_data[0];
 591         iov[iov_count].iov_base = cmd->pdu;
 592         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 593         tx_size += ISCSI_HDR_LEN;
 594
 595         if (conn->conn_ops->HeaderDigest) {
 596                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 597
 598                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 599                                           ISCSI_HDR_LEN, 0, NULL,
 600                                           (u8 *)header_digest);
 601
 602                 iov[0].iov_len += ISCSI_CRC_LEN;
 603                 tx_size += ISCSI_CRC_LEN;
 604
 605                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 606                          *header_digest);
 607         }
 608
 609         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 610                                    datain->offset, datain->length);
 611         if (iov_ret < 0)
 612                 return -1;
 613
 614         iov_count += iov_ret;
 615         tx_size += datain->length;
 616
 617         cmd->padding = ((-datain->length) & 3);
 618         if (cmd->padding) {
 619                 iov[iov_count].iov_base         = cmd->pad_bytes;
 620                 iov[iov_count++].iov_len        = cmd->padding;
 621                 tx_size += cmd->padding;
 622
 623                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 624         }
 625
 626         if (conn->conn_ops->DataDigest) {
 627                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 628                                                          cmd, datain->offset,
 629                                                          datain->length,
 630                                                          cmd->padding,
 631                                                          cmd->pad_bytes);
 632
 633                 iov[iov_count].iov_base = &cmd->data_crc;
 634                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 635                 tx_size += ISCSI_CRC_LEN;
 636
 637                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 638                          datain->length + cmd->padding, cmd->data_crc);
 639         }
 640
 641         cmd->iov_data_count = iov_count;
 642         cmd->tx_size = tx_size;
 643
 644         ret = iscsit_fe_sendpage_sg(cmd, conn);
 645
 646         iscsit_unmap_iovec(cmd);
 647
 648         if (ret < 0) {
 649                 iscsit_tx_thread_wait_for_tcp(conn);
 650                 return ret;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 657                            struct iscsi_datain_req *dr, const void *buf,
 658                            u32 buf_len)
 659 {
 660         if (dr)
 661                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 662         else
 663                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 664 }
 665
 666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 667 {
 668         return TARGET_PROT_NORMAL;
 669 }
 670
 671 static struct iscsit_transport iscsi_target_transport = {
 672         .name                   = "iSCSI/TCP",
 673         .transport_type         = ISCSI_TCP,
 674         .rdma_shutdown          = false,
 675         .owner                  = NULL,
 676         .iscsit_setup_np        = iscsit_setup_np,
 677         .iscsit_accept_np       = iscsit_accept_np,
 678         .iscsit_free_np         = iscsit_free_np,
 679         .iscsit_get_login_rx    = iscsit_get_login_rx,
 680         .iscsit_put_login_tx    = iscsit_put_login_tx,
 681         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 682         .iscsit_immediate_queue = iscsit_immediate_queue,
 683         .iscsit_response_queue  = iscsit_response_queue,
 684         .iscsit_queue_data_in   = iscsit_queue_rsp,
 685         .iscsit_queue_status    = iscsit_queue_rsp,
 686         .iscsit_aborted_task    = iscsit_aborted_task,
 687         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 688         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 689         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 690 };
 691
 692 static int __init iscsi_target_init_module(void)
 693 {
 694         int ret = 0, size;
 695
 696         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 697         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 698         if (!iscsit_global)
 699                 return -1;
 700
 701         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 702         mutex_init(&auth_id_lock);
 703         spin_lock_init(&sess_idr_lock);
 704         idr_init(&tiqn_idr);
 705         idr_init(&sess_idr);
 706
 707         ret = target_register_template(&iscsi_ops);
 708         if (ret)
 709                 goto out;
 710
 711         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 712         iscsit_global->ts_bitmap = vzalloc(size);
 713         if (!iscsit_global->ts_bitmap)
 714                 goto configfs_out;
 715
 716         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 717                         sizeof(struct iscsi_queue_req),
 718                         __alignof__(struct iscsi_queue_req), 0, NULL);
 719         if (!lio_qr_cache) {
 720                 pr_err("nable to kmem_cache_create() for"
 721                                 " lio_qr_cache\n");
 722                 goto bitmap_out;
 723         }
 724
 725         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 726                         sizeof(struct iscsi_datain_req),
 727                         __alignof__(struct iscsi_datain_req), 0, NULL);
 728         if (!lio_dr_cache) {
 729                 pr_err("Unable to kmem_cache_create() for"
 730                                 " lio_dr_cache\n");
 731                 goto qr_out;
 732         }
 733
 734         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 735                         sizeof(struct iscsi_ooo_cmdsn),
 736                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 737         if (!lio_ooo_cache) {
 738                 pr_err("Unable to kmem_cache_create() for"
 739                                 " lio_ooo_cache\n");
 740                 goto dr_out;
 741         }
 742
 743         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 744                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 745                         0, NULL);
 746         if (!lio_r2t_cache) {
 747                 pr_err("Unable to kmem_cache_create() for"
 748                                 " lio_r2t_cache\n");
 749                 goto ooo_out;
 750         }
 751
 752         iscsit_register_transport(&iscsi_target_transport);
 753
 754         if (iscsit_load_discovery_tpg() < 0)
 755                 goto r2t_out;
 756
 757         return ret;
 758 r2t_out:
 759         iscsit_unregister_transport(&iscsi_target_transport);
 760         kmem_cache_destroy(lio_r2t_cache);
 761 ooo_out:
 762         kmem_cache_destroy(lio_ooo_cache);
 763 dr_out:
 764         kmem_cache_destroy(lio_dr_cache);
 765 qr_out:
 766         kmem_cache_destroy(lio_qr_cache);
 767 bitmap_out:
 768         vfree(iscsit_global->ts_bitmap);
 769 configfs_out:
 770         /* XXX: this probably wants it to be it's own unwind step.. */
 771         if (iscsit_global->discovery_tpg)
 772                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 773         target_unregister_template(&iscsi_ops);
 774 out:
 775         kfree(iscsit_global);
 776         return -ENOMEM;
 777 }
 778
 779 static void __exit iscsi_target_cleanup_module(void)
 780 {
 781         iscsit_release_discovery_tpg();
 782         iscsit_unregister_transport(&iscsi_target_transport);
 783         kmem_cache_destroy(lio_qr_cache);
 784         kmem_cache_destroy(lio_dr_cache);
 785         kmem_cache_destroy(lio_ooo_cache);
 786         kmem_cache_destroy(lio_r2t_cache);
 787
 788         /*
 789          * Shutdown discovery sessions and disable discovery TPG
 790          */
 791         if (iscsit_global->discovery_tpg)
 792                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 793
 794         target_unregister_template(&iscsi_ops);
 795
 796         vfree(iscsit_global->ts_bitmap);
 797         kfree(iscsit_global);
 798 }
 799
 800 int iscsit_add_reject(
 801         struct iscsi_conn *conn,
 802         u8 reason,
 803         unsigned char *buf)
 804 {
 805         struct iscsi_cmd *cmd;
 806
 807         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 808         if (!cmd)
 809                 return -1;
 810
 811         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 812         cmd->reject_reason = reason;
 813
 814         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 815         if (!cmd->buf_ptr) {
 816                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 817                 iscsit_free_cmd(cmd, false);
 818                 return -1;
 819         }
 820
 821         spin_lock_bh(&conn->cmd_lock);
 822         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 823         spin_unlock_bh(&conn->cmd_lock);
 824
 825         cmd->i_state = ISTATE_SEND_REJECT;
 826         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 827
 828         return -1;
 829 }
 830 EXPORT_SYMBOL(iscsit_add_reject);
 831
 832 static int iscsit_add_reject_from_cmd(
 833         struct iscsi_cmd *cmd,
 834         u8 reason,
 835         bool add_to_conn,
 836         unsigned char *buf)
 837 {
 838         struct iscsi_conn *conn;
 839
 840         if (!cmd->conn) {
 841                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 842                                 cmd->init_task_tag);
 843                 return -1;
 844         }
 845         conn = cmd->conn;
 846
 847         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 848         cmd->reject_reason = reason;
 849
 850         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 851         if (!cmd->buf_ptr) {
 852                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 853                 iscsit_free_cmd(cmd, false);
 854                 return -1;
 855         }
 856
 857         if (add_to_conn) {
 858                 spin_lock_bh(&conn->cmd_lock);
 859                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 860                 spin_unlock_bh(&conn->cmd_lock);
 861         }
 862
 863         cmd->i_state = ISTATE_SEND_REJECT;
 864         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 865         /*
 866          * Perform the kref_put now if se_cmd has already been setup by
 867          * scsit_setup_scsi_cmd()
 868          */
 869         if (cmd->se_cmd.se_tfo != NULL) {
 870                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 871                 target_put_sess_cmd(&cmd->se_cmd);
 872         }
 873         return -1;
 874 }
 875
 876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 877                                  unsigned char *buf)
 878 {
 879         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 880 }
 881
 882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 883 {
 884         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 885 }
 886 EXPORT_SYMBOL(iscsit_reject_cmd);
 887
 888 /*
 889  * Map some portion of the allocated scatterlist to an iovec, suitable for
 890  * kernel sockets to copy data in/out.
 891  */
 892 static int iscsit_map_iovec(
 893         struct iscsi_cmd *cmd,
 894         struct kvec *iov,
 895         u32 data_offset,
 896         u32 data_length)
 897 {
 898         u32 i = 0;
 899         struct scatterlist *sg;
 900         unsigned int page_off;
 901
 902         /*
 903          * We know each entry in t_data_sg contains a page.
 904          */
 905         u32 ent = data_offset / PAGE_SIZE;
 906
 907         if (ent >= cmd->se_cmd.t_data_nents) {
 908                 pr_err("Initial page entry out-of-bounds\n");
 909                 return -1;
 910         }
 911
 912         sg = &cmd->se_cmd.t_data_sg[ent];
 913         page_off = (data_offset % PAGE_SIZE);
 914
 915         cmd->first_data_sg = sg;
 916         cmd->first_data_sg_off = page_off;
 917
 918         while (data_length) {
 919                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 920
 921                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 922                 iov[i].iov_len = cur_len;
 923
 924                 data_length -= cur_len;
 925                 page_off = 0;
 926                 sg = sg_next(sg);
 927                 i++;
 928         }
 929
 930         cmd->kmapped_nents = i;
 931
 932         return i;
 933 }
 934
 935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 936 {
 937         u32 i;
 938         struct scatterlist *sg;
 939
 940         sg = cmd->first_data_sg;
 941
 942         for (i = 0; i < cmd->kmapped_nents; i++)
 943                 kunmap(sg_page(&sg[i]));
 944 }
 945
 946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 947 {
 948         LIST_HEAD(ack_list);
 949         struct iscsi_cmd *cmd, *cmd_p;
 950
 951         conn->exp_statsn = exp_statsn;
 952
 953         if (conn->sess->sess_ops->RDMAExtensions)
 954                 return;
 955
 956         spin_lock_bh(&conn->cmd_lock);
 957         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 958                 spin_lock(&cmd->istate_lock);
 959                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 960                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 961                         cmd->i_state = ISTATE_REMOVE;
 962                         spin_unlock(&cmd->istate_lock);
 963                         list_move_tail(&cmd->i_conn_node, &ack_list);
 964                         continue;
 965                 }
 966                 spin_unlock(&cmd->istate_lock);
 967         }
 968         spin_unlock_bh(&conn->cmd_lock);
 969
 970         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 971                 list_del_init(&cmd->i_conn_node);
 972                 iscsit_free_cmd(cmd, false);
 973         }
 974 }
 975
 976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 977 {
 978         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 979
 980         iov_count += ISCSI_IOV_DATA_BUFFER;
 981         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 982         if (!cmd->iov_data)
 983                 return -ENOMEM;
 984
 985         cmd->orig_iov_data_count = iov_count;
 986         return 0;
 987 }
 988
 989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 990                           unsigned char *buf)
 991 {
 992         int data_direction, payload_length;
 993         struct iscsi_scsi_req *hdr;
 994         int iscsi_task_attr;
 995         int sam_task_attr;
 996
 997         atomic_long_inc(&conn->sess->cmd_pdus);
 998
 999         hdr                     = (struct iscsi_scsi_req *) buf;
1000         payload_length          = ntoh24(hdr->dlength);
1001
1002         /* FIXME; Add checks for AdditionalHeaderSegment */
1003
1004         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007                                 " not set. Bad iSCSI Initiator.\n");
1008                 return iscsit_add_reject_cmd(cmd,
1009                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1010         }
1011
1012         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014                 /*
1015                  * From RFC-3720 Section 10.3.1:
1016                  *
1017                  * "Either or both of R and W MAY be 1 when either the
1018                  *  Expected Data Transfer Length and/or Bidirectional Read
1019                  *  Expected Data Transfer Length are 0"
1020                  *
1021                  * For this case, go ahead and clear the unnecssary bits
1022                  * to avoid any confusion with ->data_direction.
1023                  */
1024                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1026
1027                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1028                         " set when Expected Data Transfer Length is 0 for"
1029                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030         }
1031
1032         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035                         " MUST be set if Expected Data Transfer Length is not 0."
1036                         " Bad iSCSI Initiator\n");
1037                 return iscsit_add_reject_cmd(cmd,
1038                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1039         }
1040
1041         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043                 pr_err("Bidirectional operations not supported!\n");
1044                 return iscsit_add_reject_cmd(cmd,
1045                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1046         }
1047
1048         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050                                 " Scsi Command PDU.\n");
1051                 return iscsit_add_reject_cmd(cmd,
1052                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1053         }
1054
1055         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057                         " protocol error.\n", payload_length);
1058                 return iscsit_add_reject_cmd(cmd,
1059                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1060         }
1061
1062         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1063             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064                 pr_err("Expected Data Transfer Length and Length of"
1065                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066                         " bit is not set protocol error\n");
1067                 return iscsit_add_reject_cmd(cmd,
1068                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1069         }
1070
1071         if (payload_length > be32_to_cpu(hdr->data_length)) {
1072                 pr_err("DataSegmentLength: %u is greater than"
1073                         " EDTL: %u, protocol error.\n", payload_length,
1074                                 hdr->data_length);
1075                 return iscsit_add_reject_cmd(cmd,
1076                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1077         }
1078
1079         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1080                 pr_err("DataSegmentLength: %u is greater than"
1081                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1083                 return iscsit_add_reject_cmd(cmd,
1084                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1085         }
1086
1087         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088                 pr_err("DataSegmentLength: %u is greater than"
1089                         " FirstBurstLength: %u, protocol error.\n",
1090                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1091                 return iscsit_add_reject_cmd(cmd,
1092                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1093         }
1094
1095         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097                           DMA_NONE;
1098
1099         cmd->data_direction = data_direction;
1100         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101         /*
1102          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103          */
1104         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1106                 sam_task_attr = TCM_SIMPLE_TAG;
1107         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1108                 sam_task_attr = TCM_ORDERED_TAG;
1109         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1110                 sam_task_attr = TCM_HEAD_TAG;
1111         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1112                 sam_task_attr = TCM_ACA_TAG;
1113         else {
1114                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1115                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116                 sam_task_attr = TCM_SIMPLE_TAG;
1117         }
1118
1119         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1120         cmd->i_state            = ISTATE_NEW_CMD;
1121         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122         cmd->immediate_data     = (payload_length) ? 1 : 0;
1123         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125         if (cmd->unsolicited_data)
1126                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127
1128         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1129         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1130                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1131         else
1132                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1133         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1134         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1135         cmd->first_burst_len    = payload_length;
1136
1137         if (!conn->sess->sess_ops->RDMAExtensions &&
1138              cmd->data_direction == DMA_FROM_DEVICE) {
1139                 struct iscsi_datain_req *dr;
1140
1141                 dr = iscsit_allocate_datain_req();
1142                 if (!dr)
1143                         return iscsit_add_reject_cmd(cmd,
1144                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1145
1146                 iscsit_attach_datain_req(cmd, dr);
1147         }
1148
1149         /*
1150          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151          */
1152         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1153                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154                         cmd->data_direction, sam_task_attr,
1155                         cmd->sense_buffer + 2);
1156
1157         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1159                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160                 conn->cid);
1161
1162         target_get_sess_cmd(&cmd->se_cmd, true);
1163
1164         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1165                                                      scsilun_to_int(&hdr->lun));
1166         if (cmd->sense_reason)
1167                 goto attach_cmd;
1168
1169         /* only used for printks or comparing with ->ref_task_tag */
1170         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1171         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1172         if (cmd->sense_reason) {
1173                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1174                         return iscsit_add_reject_cmd(cmd,
1175                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1176                 }
1177
1178                 goto attach_cmd;
1179         }
1180
1181         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1182                 return iscsit_add_reject_cmd(cmd,
1183                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184         }
1185
1186 attach_cmd:
1187         spin_lock_bh(&conn->cmd_lock);
1188         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1189         spin_unlock_bh(&conn->cmd_lock);
1190         /*
1191          * Check if we need to delay processing because of ALUA
1192          * Active/NonOptimized primary access state..
1193          */
1194         core_alua_check_nonop_delay(&cmd->se_cmd);
1195
1196         return 0;
1197 }
1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1199
1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1201 {
1202         iscsit_set_dataout_sequence_values(cmd);
1203
1204         spin_lock_bh(&cmd->dataout_timeout_lock);
1205         iscsit_start_dataout_timer(cmd, cmd->conn);
1206         spin_unlock_bh(&cmd->dataout_timeout_lock);
1207 }
1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1209
1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1211                             struct iscsi_scsi_req *hdr)
1212 {
1213         int cmdsn_ret = 0;
1214         /*
1215          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1216          * the Immediate Bit is not set, and no Immediate
1217          * Data is attached.
1218          *
1219          * A PDU/CmdSN carrying Immediate Data can only
1220          * be processed after the DataCRC has passed.
1221          * If the DataCRC fails, the CmdSN MUST NOT
1222          * be acknowledged. (See below)
1223          */
1224         if (!cmd->immediate_data) {
1225                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1226                                         (unsigned char *)hdr, hdr->cmdsn);
1227                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1228                         return -1;
1229                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1230                         target_put_sess_cmd(&cmd->se_cmd);
1231                         return 0;
1232                 }
1233         }
1234
1235         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236
1237         /*
1238          * If no Immediate Data is attached, it's OK to return now.
1239          */
1240         if (!cmd->immediate_data) {
1241                 if (!cmd->sense_reason && cmd->unsolicited_data)
1242                         iscsit_set_unsoliticed_dataout(cmd);
1243                 if (!cmd->sense_reason)
1244                         return 0;
1245
1246                 target_put_sess_cmd(&cmd->se_cmd);
1247                 return 0;
1248         }
1249
1250         /*
1251          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1252          * execution.  These exceptions are processed in CmdSN order using
1253          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254          */
1255         if (cmd->sense_reason)
1256                 return 1;
1257         /*
1258          * Call directly into transport_generic_new_cmd() to perform
1259          * the backend memory allocation.
1260          */
1261         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1262         if (cmd->sense_reason)
1263                 return 1;
1264
1265         return 0;
1266 }
1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268
1269 static int
1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271                           bool dump_payload)
1272 {
1273         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1274         /*
1275          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276          */
1277         if (dump_payload)
1278                 goto after_immediate_data;
1279         /*
1280          * Check for underflow case where both EDTL and immediate data payload
1281          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1282          * already been set in target_cmd_size_check() as se_cmd->data_length.
1283          *
1284          * For this special case, fail the command and dump the immediate data
1285          * payload.
1286          */
1287         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1288                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1289                 goto after_immediate_data;
1290         }
1291
1292         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1293                                         cmd->first_burst_len);
1294 after_immediate_data:
1295         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1296                 /*
1297                  * A PDU/CmdSN carrying Immediate Data passed
1298                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1299                  * Immediate Bit is not set.
1300                  */
1301                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1302                                         (unsigned char *)hdr, hdr->cmdsn);
1303                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304                         return -1;
1305
1306                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307                         int rc;
1308
1309                         rc = iscsit_dump_data_payload(cmd->conn,
1310                                                       cmd->first_burst_len, 1);
1311                         target_put_sess_cmd(&cmd->se_cmd);
1312                         return rc;
1313                 } else if (cmd->unsolicited_data)
1314                         iscsit_set_unsoliticed_dataout(cmd);
1315
1316         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1317                 /*
1318                  * Immediate Data failed DataCRC and ERL>=1,
1319                  * silently drop this PDU and let the initiator
1320                  * plug the CmdSN gap.
1321                  *
1322                  * FIXME: Send Unsolicited NOPIN with reserved
1323                  * TTT here to help the initiator figure out
1324                  * the missing CmdSN, although they should be
1325                  * intelligent enough to determine the missing
1326                  * CmdSN and issue a retry to plug the sequence.
1327                  */
1328                 cmd->i_state = ISTATE_REMOVE;
1329                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1330         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1331                 return -1;
1332
1333         return 0;
1334 }
1335
1336 static int
1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338                            unsigned char *buf)
1339 {
1340         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1341         int rc, immed_data;
1342         bool dump_payload = false;
1343
1344         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1345         if (rc < 0)
1346                 return 0;
1347         /*
1348          * Allocation iovecs needed for struct socket operations for
1349          * traditional iSCSI block I/O.
1350          */
1351         if (iscsit_allocate_iovecs(cmd) < 0) {
1352                 return iscsit_reject_cmd(cmd,
1353                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1354         }
1355         immed_data = cmd->immediate_data;
1356
1357         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1358         if (rc < 0)
1359                 return rc;
1360         else if (rc > 0)
1361                 dump_payload = true;
1362
1363         if (!immed_data)
1364                 return 0;
1365
1366         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 }
1368
1369 static u32 iscsit_do_crypto_hash_sg(
1370         struct ahash_request *hash,
1371         struct iscsi_cmd *cmd,
1372         u32 data_offset,
1373         u32 data_length,
1374         u32 padding,
1375         u8 *pad_bytes)
1376 {
1377         u32 data_crc;
1378         struct scatterlist *sg;
1379         unsigned int page_off;
1380
1381         crypto_ahash_init(hash);
1382
1383         sg = cmd->first_data_sg;
1384         page_off = cmd->first_data_sg_off;
1385
1386         while (data_length) {
1387                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1388
1389                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1390                 crypto_ahash_update(hash);
1391
1392                 data_length -= cur_len;
1393                 page_off = 0;
1394                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1395                 sg = sg_next(sg);
1396         }
1397
1398         if (padding) {
1399                 struct scatterlist pad_sg;
1400
1401                 sg_init_one(&pad_sg, pad_bytes, padding);
1402                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1403                                         padding);
1404                 crypto_ahash_finup(hash);
1405         } else {
1406                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1407                 crypto_ahash_final(hash);
1408         }
1409
1410         return data_crc;
1411 }
1412
1413 static void iscsit_do_crypto_hash_buf(
1414         struct ahash_request *hash,
1415         const void *buf,
1416         u32 payload_length,
1417         u32 padding,
1418         u8 *pad_bytes,
1419         u8 *data_crc)
1420 {
1421         struct scatterlist sg[2];
1422
1423         sg_init_table(sg, ARRAY_SIZE(sg));
1424         sg_set_buf(sg, buf, payload_length);
1425         sg_set_buf(sg + 1, pad_bytes, padding);
1426
1427         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1428
1429         crypto_ahash_digest(hash);
1430 }
1431
1432 int
1433 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1434                            struct iscsi_cmd *cmd, u32 payload_length,
1435                            bool *success)
1436 {
1437         struct iscsi_data *hdr = buf;
1438         struct se_cmd *se_cmd;
1439         int rc;
1440
1441         /* iSCSI write */
1442         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1443
1444         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1445                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1446                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1447                 payload_length, conn->cid);
1448
1449         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1450                 pr_err("Command ITT: 0x%08x received DataOUT after"
1451                         " last DataOUT received, dumping payload\n",
1452                         cmd->init_task_tag);
1453                 return iscsit_dump_data_payload(conn, payload_length, 1);
1454         }
1455
1456         if (cmd->data_direction != DMA_TO_DEVICE) {
1457                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1458                         " NON-WRITE command.\n", cmd->init_task_tag);
1459                 return iscsit_dump_data_payload(conn, payload_length, 1);
1460         }
1461         se_cmd = &cmd->se_cmd;
1462         iscsit_mod_dataout_timer(cmd);
1463
1464         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1465                 pr_err("DataOut Offset: %u, Length %u greater than"
1466                         " iSCSI Command EDTL %u, protocol error.\n",
1467                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1468                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1469         }
1470
1471         if (cmd->unsolicited_data) {
1472                 int dump_unsolicited_data = 0;
1473
1474                 if (conn->sess->sess_ops->InitialR2T) {
1475                         pr_err("Received unexpected unsolicited data"
1476                                 " while InitialR2T=Yes, protocol error.\n");
1477                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1478                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1479                         return -1;
1480                 }
1481                 /*
1482                  * Special case for dealing with Unsolicited DataOUT
1483                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1484                  * failures;
1485                  */
1486
1487                 /* Something's amiss if we're not in WRITE_PENDING state... */
1488                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1489                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1490                         dump_unsolicited_data = 1;
1491
1492                 if (dump_unsolicited_data) {
1493                         /*
1494                          * Check if a delayed TASK_ABORTED status needs to
1495                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1496                          * received with the unsolicited data out.
1497                          */
1498                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1499                                 iscsit_stop_dataout_timer(cmd);
1500
1501                         transport_check_aborted_status(se_cmd,
1502                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1503                         return iscsit_dump_data_payload(conn, payload_length, 1);
1504                 }
1505         } else {
1506                 /*
1507                  * For the normal solicited data path:
1508                  *
1509                  * Check for a delayed TASK_ABORTED status and dump any
1510                  * incoming data out payload if one exists.  Also, when the
1511                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1512                  * data out sequence, we decrement outstanding_r2ts.  Once
1513                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1514                  * TASK_ABORTED status.
1515                  */
1516                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1517                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1518                                 if (--cmd->outstanding_r2ts < 1) {
1519                                         iscsit_stop_dataout_timer(cmd);
1520                                         transport_check_aborted_status(
1521                                                         se_cmd, 1);
1522                                 }
1523
1524                         return iscsit_dump_data_payload(conn, payload_length, 1);
1525                 }
1526         }
1527         /*
1528          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1529          * within-command recovery checks before receiving the payload.
1530          */
1531         rc = iscsit_check_pre_dataout(cmd, buf);
1532         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1533                 return 0;
1534         else if (rc == DATAOUT_CANNOT_RECOVER)
1535                 return -1;
1536         *success = true;
1537         return 0;
1538 }
1539 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1540
1541 int
1542 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1543                          struct iscsi_cmd **out_cmd)
1544 {
1545         struct iscsi_data *hdr = buf;
1546         struct iscsi_cmd *cmd;
1547         u32 payload_length = ntoh24(hdr->dlength);
1548         int rc;
1549         bool success = false;
1550
1551         if (!payload_length) {
1552                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1553                 return 0;
1554         }
1555
1556         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1557                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1558                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1559                         conn->conn_ops->MaxXmitDataSegmentLength);
1560                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1561         }
1562
1563         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1564         if (!cmd)
1565                 return 0;
1566
1567         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1568
1569         if (success)
1570                 *out_cmd = cmd;
1571
1572         return rc;
1573 }
1574 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1575
1576 static int
1577 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1578                    struct iscsi_data *hdr)
1579 {
1580         struct kvec *iov;
1581         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1582         u32 payload_length = ntoh24(hdr->dlength);
1583         int iov_ret, data_crc_failed = 0;
1584
1585         rx_size += payload_length;
1586         iov = &cmd->iov_data[0];
1587
1588         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1589                                    payload_length);
1590         if (iov_ret < 0)
1591                 return -1;
1592
1593         iov_count += iov_ret;
1594
1595         padding = ((-payload_length) & 3);
1596         if (padding != 0) {
1597                 iov[iov_count].iov_base = cmd->pad_bytes;
1598                 iov[iov_count++].iov_len = padding;
1599                 rx_size += padding;
1600                 pr_debug("Receiving %u padding bytes.\n", padding);
1601         }
1602
1603         if (conn->conn_ops->DataDigest) {
1604                 iov[iov_count].iov_base = &checksum;
1605                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1606                 rx_size += ISCSI_CRC_LEN;
1607         }
1608
1609         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1610
1611         iscsit_unmap_iovec(cmd);
1612
1613         if (rx_got != rx_size)
1614                 return -1;
1615
1616         if (conn->conn_ops->DataDigest) {
1617                 u32 data_crc;
1618
1619                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1620                                                     be32_to_cpu(hdr->offset),
1621                                                     payload_length, padding,
1622                                                     cmd->pad_bytes);
1623
1624                 if (checksum != data_crc) {
1625                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1626                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1627                                 " does not match computed 0x%08x\n",
1628                                 hdr->itt, hdr->offset, payload_length,
1629                                 hdr->datasn, checksum, data_crc);
1630                         data_crc_failed = 1;
1631                 } else {
1632                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1633                                 " %u bytes of Data Out\n", checksum,
1634                                 payload_length);
1635                 }
1636         }
1637
1638         return data_crc_failed;
1639 }
1640
1641 int
1642 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1643                              bool data_crc_failed)
1644 {
1645         struct iscsi_conn *conn = cmd->conn;
1646         int rc, ooo_cmdsn;
1647         /*
1648          * Increment post receive data and CRC values or perform
1649          * within-command recovery.
1650          */
1651         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1652         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1653                 return 0;
1654         else if (rc == DATAOUT_SEND_R2T) {
1655                 iscsit_set_dataout_sequence_values(cmd);
1656                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1657         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1658                 /*
1659                  * Handle extra special case for out of order
1660                  * Unsolicited Data Out.
1661                  */
1662                 spin_lock_bh(&cmd->istate_lock);
1663                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1664                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1665                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1666                 spin_unlock_bh(&cmd->istate_lock);
1667
1668                 iscsit_stop_dataout_timer(cmd);
1669                 if (ooo_cmdsn)
1670                         return 0;
1671                 target_execute_cmd(&cmd->se_cmd);
1672                 return 0;
1673         } else /* DATAOUT_CANNOT_RECOVER */
1674                 return -1;
1675
1676         return 0;
1677 }
1678 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1679
1680 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1681 {
1682         struct iscsi_cmd *cmd = NULL;
1683         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1684         int rc;
1685         bool data_crc_failed = false;
1686
1687         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1688         if (rc < 0)
1689                 return 0;
1690         else if (!cmd)
1691                 return 0;
1692
1693         rc = iscsit_get_dataout(conn, cmd, hdr);
1694         if (rc < 0)
1695                 return rc;
1696         else if (rc > 0)
1697                 data_crc_failed = true;
1698
1699         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1700 }
1701
1702 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1703                          struct iscsi_nopout *hdr)
1704 {
1705         u32 payload_length = ntoh24(hdr->dlength);
1706
1707         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1708                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1709                 if (!cmd)
1710                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1711                                                  (unsigned char *)hdr);
1712
1713                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1714                                          (unsigned char *)hdr);
1715         }
1716
1717         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1718                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1719                         " not set, protocol error.\n");
1720                 if (!cmd)
1721                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1722                                                  (unsigned char *)hdr);
1723
1724                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1725                                          (unsigned char *)hdr);
1726         }
1727
1728         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1729                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1730                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1731                         " error.\n", payload_length,
1732                         conn->conn_ops->MaxXmitDataSegmentLength);
1733                 if (!cmd)
1734                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1735                                                  (unsigned char *)hdr);
1736
1737                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1738                                          (unsigned char *)hdr);
1739         }
1740
1741         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1742                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1743                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1744                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1745                 payload_length);
1746         /*
1747          * This is not a response to a Unsolicited NopIN, which means
1748          * it can either be a NOPOUT ping request (with a valid ITT),
1749          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1750          * Either way, make sure we allocate an struct iscsi_cmd, as both
1751          * can contain ping data.
1752          */
1753         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1754                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1755                 cmd->i_state            = ISTATE_SEND_NOPIN;
1756                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1757                                                 1 : 0);
1758                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1759                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1760                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1761                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1762                 cmd->data_direction     = DMA_NONE;
1763         }
1764
1765         return 0;
1766 }
1767 EXPORT_SYMBOL(iscsit_setup_nop_out);
1768
1769 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1770                            struct iscsi_nopout *hdr)
1771 {
1772         struct iscsi_cmd *cmd_p = NULL;
1773         int cmdsn_ret = 0;
1774         /*
1775          * Initiator is expecting a NopIN ping reply..
1776          */
1777         if (hdr->itt != RESERVED_ITT) {
1778                 if (!cmd)
1779                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1780                                                 (unsigned char *)hdr);
1781
1782                 spin_lock_bh(&conn->cmd_lock);
1783                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1784                 spin_unlock_bh(&conn->cmd_lock);
1785
1786                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1787
1788                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1789                         iscsit_add_cmd_to_response_queue(cmd, conn,
1790                                                          cmd->i_state);
1791                         return 0;
1792                 }
1793
1794                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1795                                 (unsigned char *)hdr, hdr->cmdsn);
1796                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1797                         return 0;
1798                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1799                         return -1;
1800
1801                 return 0;
1802         }
1803         /*
1804          * This was a response to a unsolicited NOPIN ping.
1805          */
1806         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1807                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1808                 if (!cmd_p)
1809                         return -EINVAL;
1810
1811                 iscsit_stop_nopin_response_timer(conn);
1812
1813                 cmd_p->i_state = ISTATE_REMOVE;
1814                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1815
1816                 iscsit_start_nopin_timer(conn);
1817                 return 0;
1818         }
1819         /*
1820          * Otherwise, initiator is not expecting a NOPIN is response.
1821          * Just ignore for now.
1822          */
1823
1824         if (cmd)
1825                 iscsit_free_cmd(cmd, false);
1826
1827         return 0;
1828 }
1829 EXPORT_SYMBOL(iscsit_process_nop_out);
1830
1831 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1832                                  unsigned char *buf)
1833 {
1834         unsigned char *ping_data = NULL;
1835         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1836         struct kvec *iov = NULL;
1837         u32 payload_length = ntoh24(hdr->dlength);
1838         int ret;
1839
1840         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1841         if (ret < 0)
1842                 return 0;
1843         /*
1844          * Handle NOP-OUT payload for traditional iSCSI sockets
1845          */
1846         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1847                 u32 checksum, data_crc, padding = 0;
1848                 int niov = 0, rx_got, rx_size = payload_length;
1849
1850                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1851                 if (!ping_data) {
1852                         ret = -1;
1853                         goto out;
1854                 }
1855
1856                 iov = &cmd->iov_misc[0];
1857                 iov[niov].iov_base      = ping_data;
1858                 iov[niov++].iov_len     = payload_length;
1859
1860                 padding = ((-payload_length) & 3);
1861                 if (padding != 0) {
1862                         pr_debug("Receiving %u additional bytes"
1863                                 " for padding.\n", padding);
1864                         iov[niov].iov_base      = &cmd->pad_bytes;
1865                         iov[niov++].iov_len     = padding;
1866                         rx_size += padding;
1867                 }
1868                 if (conn->conn_ops->DataDigest) {
1869                         iov[niov].iov_base      = &checksum;
1870                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1871                         rx_size += ISCSI_CRC_LEN;
1872                 }
1873
1874                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1875                 if (rx_got != rx_size) {
1876                         ret = -1;
1877                         goto out;
1878                 }
1879
1880                 if (conn->conn_ops->DataDigest) {
1881                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1882                                         ping_data, payload_length,
1883                                         padding, cmd->pad_bytes,
1884                                         (u8 *)&data_crc);
1885
1886                         if (checksum != data_crc) {
1887                                 pr_err("Ping data CRC32C DataDigest"
1888                                 " 0x%08x does not match computed 0x%08x\n",
1889                                         checksum, data_crc);
1890                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1891                                         pr_err("Unable to recover from"
1892                                         " NOPOUT Ping DataCRC failure while in"
1893                                                 " ERL=0.\n");
1894                                         ret = -1;
1895                                         goto out;
1896                                 } else {
1897                                         /*
1898                                          * Silently drop this PDU and let the
1899                                          * initiator plug the CmdSN gap.
1900                                          */
1901                                         pr_debug("Dropping NOPOUT"
1902                                         " Command CmdSN: 0x%08x due to"
1903                                         " DataCRC error.\n", hdr->cmdsn);
1904                                         ret = 0;
1905                                         goto out;
1906                                 }
1907                         } else {
1908                                 pr_debug("Got CRC32C DataDigest"
1909                                 " 0x%08x for %u bytes of ping data.\n",
1910                                         checksum, payload_length);
1911                         }
1912                 }
1913
1914                 ping_data[payload_length] = '\0';
1915                 /*
1916                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1917                  */
1918                 cmd->buf_ptr = ping_data;
1919                 cmd->buf_ptr_size = payload_length;
1920
1921                 pr_debug("Got %u bytes of NOPOUT ping"
1922                         " data.\n", payload_length);
1923                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1924         }
1925
1926         return iscsit_process_nop_out(conn, cmd, hdr);
1927 out:
1928         if (cmd)
1929                 iscsit_free_cmd(cmd, false);
1930
1931         kfree(ping_data);
1932         return ret;
1933 }
1934
1935 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1936 {
1937         switch (iscsi_tmf) {
1938         case ISCSI_TM_FUNC_ABORT_TASK:
1939                 return TMR_ABORT_TASK;
1940         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1941                 return TMR_ABORT_TASK_SET;
1942         case ISCSI_TM_FUNC_CLEAR_ACA:
1943                 return TMR_CLEAR_ACA;
1944         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1945                 return TMR_CLEAR_TASK_SET;
1946         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1947                 return TMR_LUN_RESET;
1948         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1949                 return TMR_TARGET_WARM_RESET;
1950         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1951                 return TMR_TARGET_COLD_RESET;
1952         default:
1953                 return TMR_UNKNOWN;
1954         }
1955 }
1956
1957 int
1958 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1959                            unsigned char *buf)
1960 {
1961         struct se_tmr_req *se_tmr;
1962         struct iscsi_tmr_req *tmr_req;
1963         struct iscsi_tm *hdr;
1964         int out_of_order_cmdsn = 0, ret;
1965         bool sess_ref = false;
1966         u8 function, tcm_function = TMR_UNKNOWN;
1967
1968         hdr                     = (struct iscsi_tm *) buf;
1969         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1970         function = hdr->flags;
1971
1972         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1973                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1974                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1975                 hdr->rtt, hdr->refcmdsn, conn->cid);
1976
1977         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1978             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1979              hdr->rtt != RESERVED_ITT)) {
1980                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1981                 hdr->rtt = RESERVED_ITT;
1982         }
1983
1984         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1985                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1986                 pr_err("Task Management Request TASK_REASSIGN not"
1987                         " issued as immediate command, bad iSCSI Initiator"
1988                                 "implementation\n");
1989                 return iscsit_add_reject_cmd(cmd,
1990                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1991         }
1992         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1993             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1994                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1995
1996         cmd->data_direction = DMA_NONE;
1997         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1998         if (!cmd->tmr_req)
1999                 return iscsit_add_reject_cmd(cmd,
2000                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2001                                              buf);
2002
2003         /*
2004          * TASK_REASSIGN for ERL=2 / connection stays inside of
2005          * LIO-Target $FABRIC_MOD
2006          */
2007         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2008                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2009                                       conn->sess->se_sess, 0, DMA_NONE,
2010                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2011
2012                 target_get_sess_cmd(&cmd->se_cmd, true);
2013                 sess_ref = true;
2014                 tcm_function = iscsit_convert_tmf(function);
2015                 if (tcm_function == TMR_UNKNOWN) {
2016                         pr_err("Unknown iSCSI TMR Function:"
2017                                " 0x%02x\n", function);
2018                         return iscsit_add_reject_cmd(cmd,
2019                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2020                 }
2021         }
2022         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2023                                  GFP_KERNEL);
2024         if (ret < 0)
2025                 return iscsit_add_reject_cmd(cmd,
2026                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2027
2028         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2029
2030         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2031         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2032         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2033         cmd->init_task_tag      = hdr->itt;
2034         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2035         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2036         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2037         se_tmr                  = cmd->se_cmd.se_tmr_req;
2038         tmr_req                 = cmd->tmr_req;
2039         /*
2040          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2041          */
2042         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2043                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2044                                                scsilun_to_int(&hdr->lun));
2045                 if (ret < 0) {
2046                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2047                         goto attach;
2048                 }
2049         }
2050
2051         switch (function) {
2052         case ISCSI_TM_FUNC_ABORT_TASK:
2053                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2054                 if (se_tmr->response)
2055                         goto attach;
2056                 break;
2057         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2058         case ISCSI_TM_FUNC_CLEAR_ACA:
2059         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2060         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2061                 break;
2062         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2063                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2064                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2065                         goto attach;
2066                 }
2067                 break;
2068         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2069                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2070                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2071                         goto attach;
2072                 }
2073                 break;
2074         case ISCSI_TM_FUNC_TASK_REASSIGN:
2075                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2076                 /*
2077                  * Perform sanity checks on the ExpDataSN only if the
2078                  * TASK_REASSIGN was successful.
2079                  */
2080                 if (se_tmr->response)
2081                         break;
2082
2083                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2084                         return iscsit_add_reject_cmd(cmd,
2085                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2086                 break;
2087         default:
2088                 pr_err("Unknown TMR function: 0x%02x, protocol"
2089                         " error.\n", function);
2090                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2091                 goto attach;
2092         }
2093
2094         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2095             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2096                 se_tmr->call_transport = 1;
2097 attach:
2098         spin_lock_bh(&conn->cmd_lock);
2099         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2100         spin_unlock_bh(&conn->cmd_lock);
2101
2102         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2103                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2104                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2105                         out_of_order_cmdsn = 1;
2106                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2107                         return 0;
2108                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2109                         return -1;
2110         }
2111         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2112
2113         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2114                 return 0;
2115         /*
2116          * Found the referenced task, send to transport for processing.
2117          */
2118         if (se_tmr->call_transport)
2119                 return transport_generic_handle_tmr(&cmd->se_cmd);
2120
2121         /*
2122          * Could not find the referenced LUN, task, or Task Management
2123          * command not authorized or supported.  Change state and
2124          * let the tx_thread send the response.
2125          *
2126          * For connection recovery, this is also the default action for
2127          * TMR TASK_REASSIGN.
2128          */
2129         if (sess_ref) {
2130                 pr_debug("Handle TMR, using sess_ref=true check\n");
2131                 target_put_sess_cmd(&cmd->se_cmd);
2132         }
2133
2134         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2135         return 0;
2136 }
2137 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2138
2139 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2140 int
2141 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2142                       struct iscsi_text *hdr)
2143 {
2144         u32 payload_length = ntoh24(hdr->dlength);
2145
2146         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2147                 pr_err("Unable to accept text parameter length: %u"
2148                         "greater than MaxXmitDataSegmentLength %u.\n",
2149                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2150                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2151                                          (unsigned char *)hdr);
2152         }
2153
2154         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2155              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2156                 pr_err("Multi sequence text commands currently not supported\n");
2157                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2158                                         (unsigned char *)hdr);
2159         }
2160
2161         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2162                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2163                 hdr->exp_statsn, payload_length);
2164
2165         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2166         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2167         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2168         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2169         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2170         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2171         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2172         cmd->data_direction     = DMA_NONE;
2173         kfree(cmd->text_in_ptr);
2174         cmd->text_in_ptr        = NULL;
2175
2176         return 0;
2177 }
2178 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2179
2180 int
2181 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2182                         struct iscsi_text *hdr)
2183 {
2184         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2185         int cmdsn_ret;
2186
2187         if (!text_in) {
2188                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2189                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2190                         pr_err("Unable to locate text_in buffer for sendtargets"
2191                                " discovery\n");
2192                         goto reject;
2193                 }
2194                 goto empty_sendtargets;
2195         }
2196         if (strncmp("SendTargets", text_in, 11) != 0) {
2197                 pr_err("Received Text Data that is not"
2198                         " SendTargets, cannot continue.\n");
2199                 goto reject;
2200         }
2201         text_ptr = strchr(text_in, '=');
2202         if (!text_ptr) {
2203                 pr_err("No \"=\" separator found in Text Data,"
2204                         "  cannot continue.\n");
2205                 goto reject;
2206         }
2207         if (!strncmp("=All", text_ptr, 4)) {
2208                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2209         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2210                    !strncmp("=eui.", text_ptr, 5)) {
2211                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2212         } else {
2213                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2214                 goto reject;
2215         }
2216
2217         spin_lock_bh(&conn->cmd_lock);
2218         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2219         spin_unlock_bh(&conn->cmd_lock);
2220
2221 empty_sendtargets:
2222         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2223
2224         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2225                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2226                                 (unsigned char *)hdr, hdr->cmdsn);
2227                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2228                         return -1;
2229
2230                 return 0;
2231         }
2232
2233         return iscsit_execute_cmd(cmd, 0);
2234
2235 reject:
2236         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2237                                  (unsigned char *)hdr);
2238 }
2239 EXPORT_SYMBOL(iscsit_process_text_cmd);
2240
2241 static int
2242 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2243                        unsigned char *buf)
2244 {
2245         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2246         char *text_in = NULL;
2247         u32 payload_length = ntoh24(hdr->dlength);
2248         int rx_size, rc;
2249
2250         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2251         if (rc < 0)
2252                 return 0;
2253
2254         rx_size = payload_length;
2255         if (payload_length) {
2256                 u32 checksum = 0, data_crc = 0;
2257                 u32 padding = 0, pad_bytes = 0;
2258                 int niov = 0, rx_got;
2259                 struct kvec iov[3];
2260
2261                 text_in = kzalloc(payload_length, GFP_KERNEL);
2262                 if (!text_in)
2263                         goto reject;
2264
2265                 cmd->text_in_ptr = text_in;
2266
2267                 memset(iov, 0, 3 * sizeof(struct kvec));
2268                 iov[niov].iov_base      = text_in;
2269                 iov[niov++].iov_len     = payload_length;
2270
2271                 padding = ((-payload_length) & 3);
2272                 if (padding != 0) {
2273                         iov[niov].iov_base = &pad_bytes;
2274                         iov[niov++].iov_len  = padding;
2275                         rx_size += padding;
2276                         pr_debug("Receiving %u additional bytes"
2277                                         " for padding.\n", padding);
2278                 }
2279                 if (conn->conn_ops->DataDigest) {
2280                         iov[niov].iov_base      = &checksum;
2281                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2282                         rx_size += ISCSI_CRC_LEN;
2283                 }
2284
2285                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2286                 if (rx_got != rx_size)
2287                         goto reject;
2288
2289                 if (conn->conn_ops->DataDigest) {
2290                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2291                                         text_in, payload_length,
2292                                         padding, (u8 *)&pad_bytes,
2293                                         (u8 *)&data_crc);
2294
2295                         if (checksum != data_crc) {
2296                                 pr_err("Text data CRC32C DataDigest"
2297                                         " 0x%08x does not match computed"
2298                                         " 0x%08x\n", checksum, data_crc);
2299                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2300                                         pr_err("Unable to recover from"
2301                                         " Text Data digest failure while in"
2302                                                 " ERL=0.\n");
2303                                         goto reject;
2304                                 } else {
2305                                         /*
2306                                          * Silently drop this PDU and let the
2307                                          * initiator plug the CmdSN gap.
2308                                          */
2309                                         pr_debug("Dropping Text"
2310                                         " Command CmdSN: 0x%08x due to"
2311                                         " DataCRC error.\n", hdr->cmdsn);
2312                                         kfree(text_in);
2313                                         return 0;
2314                                 }
2315                         } else {
2316                                 pr_debug("Got CRC32C DataDigest"
2317                                         " 0x%08x for %u bytes of text data.\n",
2318                                                 checksum, payload_length);
2319                         }
2320                 }
2321                 text_in[payload_length - 1] = '\0';
2322                 pr_debug("Successfully read %d bytes of text"
2323                                 " data.\n", payload_length);
2324         }
2325
2326         return iscsit_process_text_cmd(conn, cmd, hdr);
2327
2328 reject:
2329         kfree(cmd->text_in_ptr);
2330         cmd->text_in_ptr = NULL;
2331         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2332 }
2333
2334 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2335 {
2336         struct iscsi_conn *conn_p;
2337         struct iscsi_session *sess = conn->sess;
2338
2339         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2340                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2341
2342         atomic_set(&sess->session_logout, 1);
2343         atomic_set(&conn->conn_logout_remove, 1);
2344         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2345
2346         iscsit_inc_conn_usage_count(conn);
2347         iscsit_inc_session_usage_count(sess);
2348
2349         spin_lock_bh(&sess->conn_lock);
2350         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2351                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2352                         continue;
2353
2354                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2355                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2356         }
2357         spin_unlock_bh(&sess->conn_lock);
2358
2359         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2360
2361         return 0;
2362 }
2363
2364 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2365 {
2366         struct iscsi_conn *l_conn;
2367         struct iscsi_session *sess = conn->sess;
2368
2369         pr_debug("Received logout request CLOSECONNECTION for CID:"
2370                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2371
2372         /*
2373          * A Logout Request with a CLOSECONNECTION reason code for a CID
2374          * can arrive on a connection with a differing CID.
2375          */
2376         if (conn->cid == cmd->logout_cid) {
2377                 spin_lock_bh(&conn->state_lock);
2378                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2379                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2380
2381                 atomic_set(&conn->conn_logout_remove, 1);
2382                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2383                 iscsit_inc_conn_usage_count(conn);
2384
2385                 spin_unlock_bh(&conn->state_lock);
2386         } else {
2387                 /*
2388                  * Handle all different cid CLOSECONNECTION requests in
2389                  * iscsit_logout_post_handler_diffcid() as to give enough
2390                  * time for any non immediate command's CmdSN to be
2391                  * acknowledged on the connection in question.
2392                  *
2393                  * Here we simply make sure the CID is still around.
2394                  */
2395                 l_conn = iscsit_get_conn_from_cid(sess,
2396                                 cmd->logout_cid);
2397                 if (!l_conn) {
2398                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2399                         iscsit_add_cmd_to_response_queue(cmd, conn,
2400                                         cmd->i_state);
2401                         return 0;
2402                 }
2403
2404                 iscsit_dec_conn_usage_count(l_conn);
2405         }
2406
2407         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2408
2409         return 0;
2410 }
2411
2412 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2413 {
2414         struct iscsi_session *sess = conn->sess;
2415
2416         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2417                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2418
2419         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2420                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2421                         " while ERL!=2.\n");
2422                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2423                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2424                 return 0;
2425         }
2426
2427         if (conn->cid == cmd->logout_cid) {
2428                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2429                         " with CID: %hu on CID: %hu, implementation error.\n",
2430                                 cmd->logout_cid, conn->cid);
2431                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2432                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433                 return 0;
2434         }
2435
2436         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2437
2438         return 0;
2439 }
2440
2441 int
2442 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2443                         unsigned char *buf)
2444 {
2445         int cmdsn_ret, logout_remove = 0;
2446         u8 reason_code = 0;
2447         struct iscsi_logout *hdr;
2448         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2449
2450         hdr                     = (struct iscsi_logout *) buf;
2451         reason_code             = (hdr->flags & 0x7f);
2452
2453         if (tiqn) {
2454                 spin_lock(&tiqn->logout_stats.lock);
2455                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2456                         tiqn->logout_stats.normal_logouts++;
2457                 else
2458                         tiqn->logout_stats.abnormal_logouts++;
2459                 spin_unlock(&tiqn->logout_stats.lock);
2460         }
2461
2462         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2463                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2464                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2465                 hdr->cid, conn->cid);
2466
2467         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2468                 pr_err("Received logout request on connection that"
2469                         " is not in logged in state, ignoring request.\n");
2470                 iscsit_free_cmd(cmd, false);
2471                 return 0;
2472         }
2473
2474         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2475         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2476         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2477         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2478         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2479         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2480         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2481         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2482         cmd->logout_reason      = reason_code;
2483         cmd->data_direction     = DMA_NONE;
2484
2485         /*
2486          * We need to sleep in these cases (by returning 1) until the Logout
2487          * Response gets sent in the tx thread.
2488          */
2489         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2490            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2491             be16_to_cpu(hdr->cid) == conn->cid))
2492                 logout_remove = 1;
2493
2494         spin_lock_bh(&conn->cmd_lock);
2495         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2496         spin_unlock_bh(&conn->cmd_lock);
2497
2498         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2499                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2500
2501         /*
2502          * Immediate commands are executed, well, immediately.
2503          * Non-Immediate Logout Commands are executed in CmdSN order.
2504          */
2505         if (cmd->immediate_cmd) {
2506                 int ret = iscsit_execute_cmd(cmd, 0);
2507
2508                 if (ret < 0)
2509                         return ret;
2510         } else {
2511                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2512                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2513                         logout_remove = 0;
2514                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2515                         return -1;
2516         }
2517
2518         return logout_remove;
2519 }
2520 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2521
2522 int iscsit_handle_snack(
2523         struct iscsi_conn *conn,
2524         unsigned char *buf)
2525 {
2526         struct iscsi_snack *hdr;
2527
2528         hdr                     = (struct iscsi_snack *) buf;
2529         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2530
2531         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2532                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2533                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2534                         hdr->begrun, hdr->runlength, conn->cid);
2535
2536         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2537                 pr_err("Initiator sent SNACK request while in"
2538                         " ErrorRecoveryLevel=0.\n");
2539                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2540                                          buf);
2541         }
2542         /*
2543          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2544          * call from inside iscsi_send_recovery_datain_or_r2t().
2545          */
2546         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2547         case 0:
2548                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2549                         hdr->itt,
2550                         be32_to_cpu(hdr->ttt),
2551                         be32_to_cpu(hdr->begrun),
2552                         be32_to_cpu(hdr->runlength));
2553         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2554                 return iscsit_handle_status_snack(conn, hdr->itt,
2555                         be32_to_cpu(hdr->ttt),
2556                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2557         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2558                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2559                         be32_to_cpu(hdr->begrun),
2560                         be32_to_cpu(hdr->runlength));
2561         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2562                 /* FIXME: Support R-Data SNACK */
2563                 pr_err("R-Data SNACK Not Supported.\n");
2564                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2565                                          buf);
2566         default:
2567                 pr_err("Unknown SNACK type 0x%02x, protocol"
2568                         " error.\n", hdr->flags & 0x0f);
2569                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2570                                          buf);
2571         }
2572
2573         return 0;
2574 }
2575 EXPORT_SYMBOL(iscsit_handle_snack);
2576
2577 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2578 {
2579         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2580             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2581                 wait_for_completion_interruptible_timeout(
2582                                         &conn->rx_half_close_comp,
2583                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2584         }
2585 }
2586
2587 static int iscsit_handle_immediate_data(
2588         struct iscsi_cmd *cmd,
2589         struct iscsi_scsi_req *hdr,
2590         u32 length)
2591 {
2592         int iov_ret, rx_got = 0, rx_size = 0;
2593         u32 checksum, iov_count = 0, padding = 0;
2594         struct iscsi_conn *conn = cmd->conn;
2595         struct kvec *iov;
2596
2597         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2598         if (iov_ret < 0)
2599                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2600
2601         rx_size = length;
2602         iov_count = iov_ret;
2603         iov = &cmd->iov_data[0];
2604
2605         padding = ((-length) & 3);
2606         if (padding != 0) {
2607                 iov[iov_count].iov_base = cmd->pad_bytes;
2608                 iov[iov_count++].iov_len = padding;
2609                 rx_size += padding;
2610         }
2611
2612         if (conn->conn_ops->DataDigest) {
2613                 iov[iov_count].iov_base         = &checksum;
2614                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2615                 rx_size += ISCSI_CRC_LEN;
2616         }
2617
2618         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2619
2620         iscsit_unmap_iovec(cmd);
2621
2622         if (rx_got != rx_size) {
2623                 iscsit_rx_thread_wait_for_tcp(conn);
2624                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2625         }
2626
2627         if (conn->conn_ops->DataDigest) {
2628                 u32 data_crc;
2629
2630                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2631                                                     cmd->write_data_done, length, padding,
2632                                                     cmd->pad_bytes);
2633
2634                 if (checksum != data_crc) {
2635                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2636                                 " does not match computed 0x%08x\n", checksum,
2637                                 data_crc);
2638
2639                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2640                                 pr_err("Unable to recover from"
2641                                         " Immediate Data digest failure while"
2642                                         " in ERL=0.\n");
2643                                 iscsit_reject_cmd(cmd,
2644                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2645                                                 (unsigned char *)hdr);
2646                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2647                         } else {
2648                                 iscsit_reject_cmd(cmd,
2649                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2650                                                 (unsigned char *)hdr);
2651                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2652                         }
2653                 } else {
2654                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2655                                 " %u bytes of Immediate Data\n", checksum,
2656                                 length);
2657                 }
2658         }
2659
2660         cmd->write_data_done += length;
2661
2662         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2663                 spin_lock_bh(&cmd->istate_lock);
2664                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2665                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2666                 spin_unlock_bh(&cmd->istate_lock);
2667         }
2668
2669         return IMMEDIATE_DATA_NORMAL_OPERATION;
2670 }
2671
2672 /*
2673  *      Called with sess->conn_lock held.
2674  */
2675 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2676         with active network interface */
2677 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2678 {
2679         struct iscsi_cmd *cmd;
2680         struct iscsi_conn *conn_p;
2681         bool found = false;
2682
2683         /*
2684          * Only send a Asynchronous Message on connections whos network
2685          * interface is still functional.
2686          */
2687         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2688                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2689                         iscsit_inc_conn_usage_count(conn_p);
2690                         found = true;
2691                         break;
2692                 }
2693         }
2694
2695         if (!found)
2696                 return;
2697
2698         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2699         if (!cmd) {
2700                 iscsit_dec_conn_usage_count(conn_p);
2701                 return;
2702         }
2703
2704         cmd->logout_cid = conn->cid;
2705         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2706         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2707
2708         spin_lock_bh(&conn_p->cmd_lock);
2709         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2710         spin_unlock_bh(&conn_p->cmd_lock);
2711
2712         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2713         iscsit_dec_conn_usage_count(conn_p);
2714 }
2715
2716 static int iscsit_send_conn_drop_async_message(
2717         struct iscsi_cmd *cmd,
2718         struct iscsi_conn *conn)
2719 {
2720         struct iscsi_async *hdr;
2721
2722         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2723
2724         hdr                     = (struct iscsi_async *) cmd->pdu;
2725         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2726         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2727         cmd->init_task_tag      = RESERVED_ITT;
2728         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2729         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2730         cmd->stat_sn            = conn->stat_sn++;
2731         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2732         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2733         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2734         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2735         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2736         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2737         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2738
2739         pr_debug("Sending Connection Dropped Async Message StatSN:"
2740                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2741                         cmd->logout_cid, conn->cid);
2742
2743         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2744 }
2745
2746 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2747 {
2748         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2749             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2750                 wait_for_completion_interruptible_timeout(
2751                                         &conn->tx_half_close_comp,
2752                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2753         }
2754 }
2755
2756 void
2757 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2758                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2759                         bool set_statsn)
2760 {
2761         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2762         hdr->flags              = datain->flags;
2763         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2764                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2765                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2766                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2767                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2768                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2769                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2770                 }
2771         }
2772         hton24(hdr->dlength, datain->length);
2773         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2774                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2775                                 (struct scsi_lun *)&hdr->lun);
2776         else
2777                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2778
2779         hdr->itt                = cmd->init_task_tag;
2780
2781         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2782                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2783         else
2784                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2785         if (set_statsn)
2786                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2787         else
2788                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2789
2790         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2791         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2792         hdr->datasn             = cpu_to_be32(datain->data_sn);
2793         hdr->offset             = cpu_to_be32(datain->offset);
2794
2795         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2796                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2797                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2798                 ntohl(hdr->offset), datain->length, conn->cid);
2799 }
2800 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2801
2802 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2803 {
2804         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2805         struct iscsi_datain datain;
2806         struct iscsi_datain_req *dr;
2807         int eodr = 0, ret;
2808         bool set_statsn = false;
2809
2810         memset(&datain, 0, sizeof(struct iscsi_datain));
2811         dr = iscsit_get_datain_values(cmd, &datain);
2812         if (!dr) {
2813                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2814                                 cmd->init_task_tag);
2815                 return -1;
2816         }
2817         /*
2818          * Be paranoid and double check the logic for now.
2819          */
2820         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2821                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2822                         " datain.length: %u exceeds cmd->data_length: %u\n",
2823                         cmd->init_task_tag, datain.offset, datain.length,
2824                         cmd->se_cmd.data_length);
2825                 return -1;
2826         }
2827
2828         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2829         /*
2830          * Special case for successfully execution w/ both DATAIN
2831          * and Sense Data.
2832          */
2833         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2834             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2835                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2836         else {
2837                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2838                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2839                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2840                         cmd->stat_sn = conn->stat_sn++;
2841                         set_statsn = true;
2842                 } else if (dr->dr_complete ==
2843                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2844                         set_statsn = true;
2845         }
2846
2847         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2848
2849         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2850         if (ret < 0)
2851                 return ret;
2852
2853         if (dr->dr_complete) {
2854                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2855                                 2 : 1;
2856                 iscsit_free_datain_req(cmd, dr);
2857         }
2858
2859         return eodr;
2860 }
2861
2862 int
2863 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2864                         struct iscsi_logout_rsp *hdr)
2865 {
2866         struct iscsi_conn *logout_conn = NULL;
2867         struct iscsi_conn_recovery *cr = NULL;
2868         struct iscsi_session *sess = conn->sess;
2869         /*
2870          * The actual shutting down of Sessions and/or Connections
2871          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2872          * is done in scsi_logout_post_handler().
2873          */
2874         switch (cmd->logout_reason) {
2875         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2876                 pr_debug("iSCSI session logout successful, setting"
2877                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2878                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2879                 break;
2880         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2881                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2882                         break;
2883                 /*
2884                  * For CLOSECONNECTION logout requests carrying
2885                  * a matching logout CID -> local CID, the reference
2886                  * for the local CID will have been incremented in
2887                  * iscsi_logout_closeconnection().
2888                  *
2889                  * For CLOSECONNECTION logout requests carrying
2890                  * a different CID than the connection it arrived
2891                  * on, the connection responding to cmd->logout_cid
2892                  * is stopped in iscsit_logout_post_handler_diffcid().
2893                  */
2894
2895                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2896                         " successful.\n", cmd->logout_cid, conn->cid);
2897                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2898                 break;
2899         case ISCSI_LOGOUT_REASON_RECOVERY:
2900                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2901                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2902                         break;
2903                 /*
2904                  * If the connection is still active from our point of view
2905                  * force connection recovery to occur.
2906                  */
2907                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2908                                 cmd->logout_cid);
2909                 if (logout_conn) {
2910                         iscsit_connection_reinstatement_rcfr(logout_conn);
2911                         iscsit_dec_conn_usage_count(logout_conn);
2912                 }
2913
2914                 cr = iscsit_get_inactive_connection_recovery_entry(
2915                                 conn->sess, cmd->logout_cid);
2916                 if (!cr) {
2917                         pr_err("Unable to locate CID: %hu for"
2918                         " REMOVECONNFORRECOVERY Logout Request.\n",
2919                                 cmd->logout_cid);
2920                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2921                         break;
2922                 }
2923
2924                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2925
2926                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2927                         " for recovery for CID: %hu on CID: %hu successful.\n",
2928                                 cmd->logout_cid, conn->cid);
2929                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2930                 break;
2931         default:
2932                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2933                                 cmd->logout_reason);
2934                 return -1;
2935         }
2936
2937         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2938         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2939         hdr->response           = cmd->logout_response;
2940         hdr->itt                = cmd->init_task_tag;
2941         cmd->stat_sn            = conn->stat_sn++;
2942         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2943
2944         iscsit_increment_maxcmdsn(cmd, conn->sess);
2945         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2946         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2947
2948         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2949                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2950                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2951                 cmd->logout_cid, conn->cid);
2952
2953         return 0;
2954 }
2955 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2956
2957 static int
2958 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2959 {
2960         int rc;
2961
2962         rc = iscsit_build_logout_rsp(cmd, conn,
2963                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2964         if (rc < 0)
2965                 return rc;
2966
2967         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2968 }
2969
2970 void
2971 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2972                        struct iscsi_nopin *hdr, bool nopout_response)
2973 {
2974         hdr->opcode             = ISCSI_OP_NOOP_IN;
2975         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2976         hton24(hdr->dlength, cmd->buf_ptr_size);
2977         if (nopout_response)
2978                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2979         hdr->itt                = cmd->init_task_tag;
2980         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2981         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2982                                   conn->stat_sn;
2983         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2984
2985         if (nopout_response)
2986                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2987
2988         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2989         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2990
2991         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2992                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2993                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2994                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2995 }
2996 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2997
2998 /*
2999  *      Unsolicited NOPIN, either requesting a response or not.
3000  */
3001 static int iscsit_send_unsolicited_nopin(
3002         struct iscsi_cmd *cmd,
3003         struct iscsi_conn *conn,
3004         int want_response)
3005 {
3006         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3007         int ret;
3008
3009         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3010
3011         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3012                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3013
3014         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3015         if (ret < 0)
3016                 return ret;
3017
3018         spin_lock_bh(&cmd->istate_lock);
3019         cmd->i_state = want_response ?
3020                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3021         spin_unlock_bh(&cmd->istate_lock);
3022
3023         return 0;
3024 }
3025
3026 static int
3027 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3028 {
3029         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3030
3031         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3032
3033         /*
3034          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3035          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3036          */
3037         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3038
3039         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3040                                                      cmd->buf_ptr,
3041                                                      cmd->buf_ptr_size);
3042 }
3043
3044 static int iscsit_send_r2t(
3045         struct iscsi_cmd *cmd,
3046         struct iscsi_conn *conn)
3047 {
3048         struct iscsi_r2t *r2t;
3049         struct iscsi_r2t_rsp *hdr;
3050         int ret;
3051
3052         r2t = iscsit_get_r2t_from_list(cmd);
3053         if (!r2t)
3054                 return -1;
3055
3056         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3057         memset(hdr, 0, ISCSI_HDR_LEN);
3058         hdr->opcode             = ISCSI_OP_R2T;
3059         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3060         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3061                         (struct scsi_lun *)&hdr->lun);
3062         hdr->itt                = cmd->init_task_tag;
3063         if (conn->conn_transport->iscsit_get_r2t_ttt)
3064                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3065         else
3066                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3067         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3068         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3069         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3070         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3071         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3072         hdr->data_offset        = cpu_to_be32(r2t->offset);
3073         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3074
3075         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3076                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3077                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3078                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3079                         r2t->offset, r2t->xfer_len, conn->cid);
3080
3081         spin_lock_bh(&cmd->r2t_lock);
3082         r2t->sent_r2t = 1;
3083         spin_unlock_bh(&cmd->r2t_lock);
3084
3085         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3086         if (ret < 0) {
3087                 return ret;
3088         }
3089
3090         spin_lock_bh(&cmd->dataout_timeout_lock);
3091         iscsit_start_dataout_timer(cmd, conn);
3092         spin_unlock_bh(&cmd->dataout_timeout_lock);
3093
3094         return 0;
3095 }
3096
3097 /*
3098  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3099  *              connection recovery.
3100  */
3101 int iscsit_build_r2ts_for_cmd(
3102         struct iscsi_conn *conn,
3103         struct iscsi_cmd *cmd,
3104         bool recovery)
3105 {
3106         int first_r2t = 1;
3107         u32 offset = 0, xfer_len = 0;
3108
3109         spin_lock_bh(&cmd->r2t_lock);
3110         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3111                 spin_unlock_bh(&cmd->r2t_lock);
3112                 return 0;
3113         }
3114
3115         if (conn->sess->sess_ops->DataSequenceInOrder &&
3116             !recovery)
3117                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3118
3119         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3120                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3121                         offset = cmd->r2t_offset;
3122
3123                         if (first_r2t && recovery) {
3124                                 int new_data_end = offset +
3125                                         conn->sess->sess_ops->MaxBurstLength -
3126                                         cmd->next_burst_len;
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 =
3132                                                 conn->sess->sess_ops->MaxBurstLength -
3133                                                 cmd->next_burst_len;
3134                         } else {
3135                                 int new_data_end = offset +
3136                                         conn->sess->sess_ops->MaxBurstLength;
3137
3138                                 if (new_data_end > cmd->se_cmd.data_length)
3139                                         xfer_len = cmd->se_cmd.data_length - offset;
3140                                 else
3141                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3142                         }
3143                         cmd->r2t_offset += xfer_len;
3144
3145                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3146                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3147                 } else {
3148                         struct iscsi_seq *seq;
3149
3150                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3151                         if (!seq) {
3152                                 spin_unlock_bh(&cmd->r2t_lock);
3153                                 return -1;
3154                         }
3155
3156                         offset = seq->offset;
3157                         xfer_len = seq->xfer_len;
3158
3159                         if (cmd->seq_send_order == cmd->seq_count)
3160                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3161                 }
3162                 cmd->outstanding_r2ts++;
3163                 first_r2t = 0;
3164
3165                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3166                         spin_unlock_bh(&cmd->r2t_lock);
3167                         return -1;
3168                 }
3169
3170                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3171                         break;
3172         }
3173         spin_unlock_bh(&cmd->r2t_lock);
3174
3175         return 0;
3176 }
3177 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3178
3179 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3180                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3181 {
3182         if (inc_stat_sn)
3183                 cmd->stat_sn = conn->stat_sn++;
3184
3185         atomic_long_inc(&conn->sess->rsp_pdus);
3186
3187         memset(hdr, 0, ISCSI_HDR_LEN);
3188         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3189         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3190         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3191                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3192                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3193         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3194                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3195                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3196         }
3197         hdr->response           = cmd->iscsi_response;
3198         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3199         hdr->itt                = cmd->init_task_tag;
3200         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3201
3202         iscsit_increment_maxcmdsn(cmd, conn->sess);
3203         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3204         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3205
3206         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3207                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3208                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3209                 cmd->se_cmd.scsi_status, conn->cid);
3210 }
3211 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3212
3213 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3214 {
3215         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3216         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3217         void *data_buf = NULL;
3218         u32 padding = 0, data_buf_len = 0;
3219
3220         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3221
3222         /*
3223          * Attach SENSE DATA payload to iSCSI Response PDU
3224          */
3225         if (cmd->se_cmd.sense_buffer &&
3226            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3227             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3228                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3229                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3230
3231                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3232                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3233                 data_buf = cmd->sense_buffer;
3234                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3235
3236                 if (padding) {
3237                         memset(cmd->sense_buffer +
3238                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3239                         pr_debug("Adding %u bytes of padding to"
3240                                 " SENSE.\n", padding);
3241                 }
3242
3243                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3244                                 " Response PDU\n",
3245                                 cmd->se_cmd.scsi_sense_length);
3246         }
3247
3248         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3249                                                      data_buf_len);
3250 }
3251
3252 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3253 {
3254         switch (se_tmr->response) {
3255         case TMR_FUNCTION_COMPLETE:
3256                 return ISCSI_TMF_RSP_COMPLETE;
3257         case TMR_TASK_DOES_NOT_EXIST:
3258                 return ISCSI_TMF_RSP_NO_TASK;
3259         case TMR_LUN_DOES_NOT_EXIST:
3260                 return ISCSI_TMF_RSP_NO_LUN;
3261         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3262                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3263         case TMR_FUNCTION_REJECTED:
3264         default:
3265                 return ISCSI_TMF_RSP_REJECTED;
3266         }
3267 }
3268
3269 void
3270 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3271                           struct iscsi_tm_rsp *hdr)
3272 {
3273         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3274
3275         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3276         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3277         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3278         hdr->itt                = cmd->init_task_tag;
3279         cmd->stat_sn            = conn->stat_sn++;
3280         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3281
3282         iscsit_increment_maxcmdsn(cmd, conn->sess);
3283         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3284         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3285
3286         pr_debug("Built Task Management Response ITT: 0x%08x,"
3287                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3288                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3289 }
3290 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3291
3292 static int
3293 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3294 {
3295         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3296
3297         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3298
3299         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3300 }
3301
3302 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3303 {
3304         bool ret = false;
3305
3306         if (np->np_sockaddr.ss_family == AF_INET6) {
3307                 const struct sockaddr_in6 sin6 = {
3308                         .sin6_addr = IN6ADDR_ANY_INIT };
3309                 struct sockaddr_in6 *sock_in6 =
3310                          (struct sockaddr_in6 *)&np->np_sockaddr;
3311
3312                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3313                                 sin6.sin6_addr.s6_addr, 16))
3314                         ret = true;
3315         } else {
3316                 struct sockaddr_in * sock_in =
3317                         (struct sockaddr_in *)&np->np_sockaddr;
3318
3319                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3320                         ret = true;
3321         }
3322
3323         return ret;
3324 }
3325
3326 #define SENDTARGETS_BUF_LIMIT 32768U
3327
3328 static int
3329 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3330                                   enum iscsit_transport_type network_transport,
3331                                   int skip_bytes, bool *completed)
3332 {
3333         char *payload = NULL;
3334         struct iscsi_conn *conn = cmd->conn;
3335         struct iscsi_portal_group *tpg;
3336         struct iscsi_tiqn *tiqn;
3337         struct iscsi_tpg_np *tpg_np;
3338         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3339         int target_name_printed;
3340         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3341         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3342         bool active;
3343
3344         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3345                          SENDTARGETS_BUF_LIMIT);
3346
3347         payload = kzalloc(buffer_len, GFP_KERNEL);
3348         if (!payload)
3349                 return -ENOMEM;
3350
3351         /*
3352          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3353          * explicit case..
3354          */
3355         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3356                 text_ptr = strchr(text_in, '=');
3357                 if (!text_ptr) {
3358                         pr_err("Unable to locate '=' string in text_in:"
3359                                " %s\n", text_in);
3360                         kfree(payload);
3361                         return -EINVAL;
3362                 }
3363                 /*
3364                  * Skip over '=' character..
3365                  */
3366                 text_ptr += 1;
3367         }
3368
3369         spin_lock(&tiqn_lock);
3370         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3371                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3372                      strcmp(tiqn->tiqn, text_ptr)) {
3373                         continue;
3374                 }
3375
3376                 target_name_printed = 0;
3377
3378                 spin_lock(&tiqn->tiqn_tpg_lock);
3379                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3380
3381                         /* If demo_mode_discovery=0 and generate_node_acls=0
3382                          * (demo mode dislabed) do not return
3383                          * TargetName+TargetAddress unless a NodeACL exists.
3384                          */
3385
3386                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3387                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3388                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3389                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3390                                 continue;
3391                         }
3392
3393                         spin_lock(&tpg->tpg_state_lock);
3394                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3395                         spin_unlock(&tpg->tpg_state_lock);
3396
3397                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3398                                 continue;
3399
3400                         spin_lock(&tpg->tpg_np_lock);
3401                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3402                                                 tpg_np_list) {
3403                                 struct iscsi_np *np = tpg_np->tpg_np;
3404                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3405                                 struct sockaddr_storage *sockaddr;
3406
3407                                 if (np->np_network_transport != network_transport)
3408                                         continue;
3409
3410                                 if (!target_name_printed) {
3411                                         len = sprintf(buf, "TargetName=%s",
3412                                                       tiqn->tiqn);
3413                                         len += 1;
3414
3415                                         if ((len + payload_len) > buffer_len) {
3416                                                 spin_unlock(&tpg->tpg_np_lock);
3417                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3418                                                 end_of_buf = 1;
3419                                                 goto eob;
3420                                         }
3421
3422                                         if (skip_bytes && len <= skip_bytes) {
3423                                                 skip_bytes -= len;
3424                                         } else {
3425                                                 memcpy(payload + payload_len, buf, len);
3426                                                 payload_len += len;
3427                                                 target_name_printed = 1;
3428                                                 if (len > skip_bytes)
3429                                                         skip_bytes = 0;
3430                                         }
3431                                 }
3432
3433                                 if (inaddr_any)
3434                                         sockaddr = &conn->local_sockaddr;
3435                                 else
3436                                         sockaddr = &np->np_sockaddr;
3437
3438                                 len = sprintf(buf, "TargetAddress="
3439                                               "%pISpc,%hu",
3440                                               sockaddr,
3441                                               tpg->tpgt);
3442                                 len += 1;
3443
3444                                 if ((len + payload_len) > buffer_len) {
3445                                         spin_unlock(&tpg->tpg_np_lock);
3446                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3447                                         end_of_buf = 1;
3448                                         goto eob;
3449                                 }
3450
3451                                 if (skip_bytes && len <= skip_bytes) {
3452                                         skip_bytes -= len;
3453                                 } else {
3454                                         memcpy(payload + payload_len, buf, len);
3455                                         payload_len += len;
3456                                         if (len > skip_bytes)
3457                                                 skip_bytes = 0;
3458                                 }
3459                         }
3460                         spin_unlock(&tpg->tpg_np_lock);
3461                 }
3462                 spin_unlock(&tiqn->tiqn_tpg_lock);
3463 eob:
3464                 if (end_of_buf) {
3465                         *completed = false;
3466                         break;
3467                 }
3468
3469                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3470                         break;
3471         }
3472         spin_unlock(&tiqn_lock);
3473
3474         cmd->buf_ptr = payload;
3475
3476         return payload_len;
3477 }
3478
3479 int
3480 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3481                       struct iscsi_text_rsp *hdr,
3482                       enum iscsit_transport_type network_transport)
3483 {
3484         int text_length, padding;
3485         bool completed = true;
3486
3487         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3488                                                         cmd->read_data_done,
3489                                                         &completed);
3490         if (text_length < 0)
3491                 return text_length;
3492
3493         if (completed) {
3494                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3495         } else {
3496                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3497                 cmd->read_data_done += text_length;
3498                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3499                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3500         }
3501         hdr->opcode = ISCSI_OP_TEXT_RSP;
3502         padding = ((-text_length) & 3);
3503         hton24(hdr->dlength, text_length);
3504         hdr->itt = cmd->init_task_tag;
3505         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3506         cmd->stat_sn = conn->stat_sn++;
3507         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3508
3509         iscsit_increment_maxcmdsn(cmd, conn->sess);
3510         /*
3511          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3512          * correctly increment MaxCmdSN for each response answering a
3513          * non immediate text request with a valid CmdSN.
3514          */
3515         cmd->maxcmdsn_inc = 0;
3516         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3517         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3518
3519         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3520                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3521                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3522                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3523                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3524
3525         return text_length + padding;
3526 }
3527 EXPORT_SYMBOL(iscsit_build_text_rsp);
3528
3529 static int iscsit_send_text_rsp(
3530         struct iscsi_cmd *cmd,
3531         struct iscsi_conn *conn)
3532 {
3533         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3534         int text_length;
3535
3536         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3537                                 conn->conn_transport->transport_type);
3538         if (text_length < 0)
3539                 return text_length;
3540
3541         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3542                                                      cmd->buf_ptr,
3543                                                      text_length);
3544 }
3545
3546 void
3547 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3548                     struct iscsi_reject *hdr)
3549 {
3550         hdr->opcode             = ISCSI_OP_REJECT;
3551         hdr->reason             = cmd->reject_reason;
3552         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3553         hton24(hdr->dlength, ISCSI_HDR_LEN);
3554         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3555         cmd->stat_sn            = conn->stat_sn++;
3556         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3557         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3558         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3559
3560 }
3561 EXPORT_SYMBOL(iscsit_build_reject);
3562
3563 static int iscsit_send_reject(
3564         struct iscsi_cmd *cmd,
3565         struct iscsi_conn *conn)
3566 {
3567         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3568
3569         iscsit_build_reject(cmd, conn, hdr);
3570
3571         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3572                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3573
3574         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3575                                                      cmd->buf_ptr,
3576                                                      ISCSI_HDR_LEN);
3577 }
3578
3579 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3580 {
3581         int ord, cpu;
3582         /*
3583          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3584          * within iscsit_start_kthreads()
3585          *
3586          * Here we use bitmap_id to determine which CPU that this
3587          * iSCSI connection's RX/TX threads will be scheduled to
3588          * execute upon.
3589          */
3590         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3591         for_each_online_cpu(cpu) {
3592                 if (ord-- == 0) {
3593                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3594                         return;
3595                 }
3596         }
3597         /*
3598          * This should never be reached..
3599          */
3600         dump_stack();
3601         cpumask_setall(conn->conn_cpumask);
3602 }
3603
3604 int
3605 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3606 {
3607         int ret;
3608
3609         switch (state) {
3610         case ISTATE_SEND_R2T:
3611                 ret = iscsit_send_r2t(cmd, conn);
3612                 if (ret < 0)
3613                         goto err;
3614                 break;
3615         case ISTATE_REMOVE:
3616                 spin_lock_bh(&conn->cmd_lock);
3617                 list_del_init(&cmd->i_conn_node);
3618                 spin_unlock_bh(&conn->cmd_lock);
3619
3620                 iscsit_free_cmd(cmd, false);
3621                 break;
3622         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3623                 iscsit_mod_nopin_response_timer(conn);
3624                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3625                 if (ret < 0)
3626                         goto err;
3627                 break;
3628         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3629                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3630                 if (ret < 0)
3631                         goto err;
3632                 break;
3633         default:
3634                 pr_err("Unknown Opcode: 0x%02x ITT:"
3635                        " 0x%08x, i_state: %d on CID: %hu\n",
3636                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3637                        conn->cid);
3638                 goto err;
3639         }
3640
3641         return 0;
3642
3643 err:
3644         return -1;
3645 }
3646 EXPORT_SYMBOL(iscsit_immediate_queue);
3647
3648 static int
3649 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3650 {
3651         struct iscsit_transport *t = conn->conn_transport;
3652         struct iscsi_queue_req *qr;
3653         struct iscsi_cmd *cmd;
3654         u8 state;
3655         int ret;
3656
3657         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3658                 atomic_set(&conn->check_immediate_queue, 0);
3659                 cmd = qr->cmd;
3660                 state = qr->state;
3661                 kmem_cache_free(lio_qr_cache, qr);
3662
3663                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3664                 if (ret < 0)
3665                         return ret;
3666         }
3667
3668         return 0;
3669 }
3670
3671 int
3672 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3673 {
3674         int ret;
3675
3676 check_rsp_state:
3677         switch (state) {
3678         case ISTATE_SEND_DATAIN:
3679                 ret = iscsit_send_datain(cmd, conn);
3680                 if (ret < 0)
3681                         goto err;
3682                 else if (!ret)
3683                         /* more drs */
3684                         goto check_rsp_state;
3685                 else if (ret == 1) {
3686                         /* all done */
3687                         spin_lock_bh(&cmd->istate_lock);
3688                         cmd->i_state = ISTATE_SENT_STATUS;
3689                         spin_unlock_bh(&cmd->istate_lock);
3690
3691                         if (atomic_read(&conn->check_immediate_queue))
3692                                 return 1;
3693
3694                         return 0;
3695                 } else if (ret == 2) {
3696                         /* Still must send status,
3697                            SCF_TRANSPORT_TASK_SENSE was set */
3698                         spin_lock_bh(&cmd->istate_lock);
3699                         cmd->i_state = ISTATE_SEND_STATUS;
3700                         spin_unlock_bh(&cmd->istate_lock);
3701                         state = ISTATE_SEND_STATUS;
3702                         goto check_rsp_state;
3703                 }
3704
3705                 break;
3706         case ISTATE_SEND_STATUS:
3707         case ISTATE_SEND_STATUS_RECOVERY:
3708                 ret = iscsit_send_response(cmd, conn);
3709                 break;
3710         case ISTATE_SEND_LOGOUTRSP:
3711                 ret = iscsit_send_logout(cmd, conn);
3712                 break;
3713         case ISTATE_SEND_ASYNCMSG:
3714                 ret = iscsit_send_conn_drop_async_message(
3715                         cmd, conn);
3716                 break;
3717         case ISTATE_SEND_NOPIN:
3718                 ret = iscsit_send_nopin(cmd, conn);
3719                 break;
3720         case ISTATE_SEND_REJECT:
3721                 ret = iscsit_send_reject(cmd, conn);
3722                 break;
3723         case ISTATE_SEND_TASKMGTRSP:
3724                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3725                 if (ret != 0)
3726                         break;
3727                 ret = iscsit_tmr_post_handler(cmd, conn);
3728                 if (ret != 0)
3729                         iscsit_fall_back_to_erl0(conn->sess);
3730                 break;
3731         case ISTATE_SEND_TEXTRSP:
3732                 ret = iscsit_send_text_rsp(cmd, conn);
3733                 break;
3734         default:
3735                 pr_err("Unknown Opcode: 0x%02x ITT:"
3736                        " 0x%08x, i_state: %d on CID: %hu\n",
3737                        cmd->iscsi_opcode, cmd->init_task_tag,
3738                        state, conn->cid);
3739                 goto err;
3740         }
3741         if (ret < 0)
3742                 goto err;
3743
3744         switch (state) {
3745         case ISTATE_SEND_LOGOUTRSP:
3746                 if (!iscsit_logout_post_handler(cmd, conn))
3747                         return -ECONNRESET;
3748                 /* fall through */
3749         case ISTATE_SEND_STATUS:
3750         case ISTATE_SEND_ASYNCMSG:
3751         case ISTATE_SEND_NOPIN:
3752         case ISTATE_SEND_STATUS_RECOVERY:
3753         case ISTATE_SEND_TEXTRSP:
3754         case ISTATE_SEND_TASKMGTRSP:
3755         case ISTATE_SEND_REJECT:
3756                 spin_lock_bh(&cmd->istate_lock);
3757                 cmd->i_state = ISTATE_SENT_STATUS;
3758                 spin_unlock_bh(&cmd->istate_lock);
3759                 break;
3760         default:
3761                 pr_err("Unknown Opcode: 0x%02x ITT:"
3762                        " 0x%08x, i_state: %d on CID: %hu\n",
3763                        cmd->iscsi_opcode, cmd->init_task_tag,
3764                        cmd->i_state, conn->cid);
3765                 goto err;
3766         }
3767
3768         if (atomic_read(&conn->check_immediate_queue))
3769                 return 1;
3770
3771         return 0;
3772
3773 err:
3774         return -1;
3775 }
3776 EXPORT_SYMBOL(iscsit_response_queue);
3777
3778 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3779 {
3780         struct iscsit_transport *t = conn->conn_transport;
3781         struct iscsi_queue_req *qr;
3782         struct iscsi_cmd *cmd;
3783         u8 state;
3784         int ret;
3785
3786         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3787                 cmd = qr->cmd;
3788                 state = qr->state;
3789                 kmem_cache_free(lio_qr_cache, qr);
3790
3791                 ret = t->iscsit_response_queue(conn, cmd, state);
3792                 if (ret == 1 || ret < 0)
3793                         return ret;
3794         }
3795
3796         return 0;
3797 }
3798
3799 int iscsi_target_tx_thread(void *arg)
3800 {
3801         int ret = 0;
3802         struct iscsi_conn *conn = arg;
3803         bool conn_freed = false;
3804
3805         /*
3806          * Allow ourselves to be interrupted by SIGINT so that a
3807          * connection recovery / failure event can be triggered externally.
3808          */
3809         allow_signal(SIGINT);
3810
3811         while (!kthread_should_stop()) {
3812                 /*
3813                  * Ensure that both TX and RX per connection kthreads
3814                  * are scheduled to run on the same CPU.
3815                  */
3816                 iscsit_thread_check_cpumask(conn, current, 1);
3817
3818                 wait_event_interruptible(conn->queues_wq,
3819                                          !iscsit_conn_all_queues_empty(conn));
3820
3821                 if (signal_pending(current))
3822                         goto transport_err;
3823
3824 get_immediate:
3825                 ret = iscsit_handle_immediate_queue(conn);
3826                 if (ret < 0)
3827                         goto transport_err;
3828
3829                 ret = iscsit_handle_response_queue(conn);
3830                 if (ret == 1) {
3831                         goto get_immediate;
3832                 } else if (ret == -ECONNRESET) {
3833                         conn_freed = true;
3834                         goto out;
3835                 } else if (ret < 0) {
3836                         goto transport_err;
3837                 }
3838         }
3839
3840 transport_err:
3841         /*
3842          * Avoid the normal connection failure code-path if this connection
3843          * is still within LOGIN mode, and iscsi_np process context is
3844          * responsible for cleaning up the early connection failure.
3845          */
3846         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3847                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3848 out:
3849         if (!conn_freed) {
3850                 while (!kthread_should_stop()) {
3851                         msleep(100);
3852                 }
3853         }
3854         return 0;
3855 }
3856
3857 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3858 {
3859         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3860         struct iscsi_cmd *cmd;
3861         int ret = 0;
3862
3863         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3864         case ISCSI_OP_SCSI_CMD:
3865                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3866                 if (!cmd)
3867                         goto reject;
3868
3869                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3870                 break;
3871         case ISCSI_OP_SCSI_DATA_OUT:
3872                 ret = iscsit_handle_data_out(conn, buf);
3873                 break;
3874         case ISCSI_OP_NOOP_OUT:
3875                 cmd = NULL;
3876                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3877                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3878                         if (!cmd)
3879                                 goto reject;
3880                 }
3881                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3882                 break;
3883         case ISCSI_OP_SCSI_TMFUNC:
3884                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3885                 if (!cmd)
3886                         goto reject;
3887
3888                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3889                 break;
3890         case ISCSI_OP_TEXT:
3891                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3892                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3893                         if (!cmd)
3894                                 goto reject;
3895                 } else {
3896                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3897                         if (!cmd)
3898                                 goto reject;
3899                 }
3900
3901                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3902                 break;
3903         case ISCSI_OP_LOGOUT:
3904                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3905                 if (!cmd)
3906                         goto reject;
3907
3908                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3909                 if (ret > 0)
3910                         wait_for_completion_timeout(&conn->conn_logout_comp,
3911                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3912                 break;
3913         case ISCSI_OP_SNACK:
3914                 ret = iscsit_handle_snack(conn, buf);
3915                 break;
3916         default:
3917                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3918                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3919                         pr_err("Cannot recover from unknown"
3920                         " opcode while ERL=0, closing iSCSI connection.\n");
3921                         return -1;
3922                 }
3923                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3924                        " closing iSCSI connection.\n");
3925                 ret = -1;
3926                 break;
3927         }
3928
3929         return ret;
3930 reject:
3931         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3932 }
3933
3934 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3935 {
3936         bool ret;
3937
3938         spin_lock_bh(&conn->state_lock);
3939         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3940         spin_unlock_bh(&conn->state_lock);
3941
3942         return ret;
3943 }
3944
3945 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3946 {
3947         int ret;
3948         u8 buffer[ISCSI_HDR_LEN], opcode;
3949         u32 checksum = 0, digest = 0;
3950         struct kvec iov;
3951
3952         while (!kthread_should_stop()) {
3953                 /*
3954                  * Ensure that both TX and RX per connection kthreads
3955                  * are scheduled to run on the same CPU.
3956                  */
3957                 iscsit_thread_check_cpumask(conn, current, 0);
3958
3959                 memset(buffer, 0, ISCSI_HDR_LEN);
3960                 memset(&iov, 0, sizeof(struct kvec));
3961
3962                 iov.iov_base    = buffer;
3963                 iov.iov_len     = ISCSI_HDR_LEN;
3964
3965                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3966                 if (ret != ISCSI_HDR_LEN) {
3967                         iscsit_rx_thread_wait_for_tcp(conn);
3968                         return;
3969                 }
3970
3971                 if (conn->conn_ops->HeaderDigest) {
3972                         iov.iov_base    = &digest;
3973                         iov.iov_len     = ISCSI_CRC_LEN;
3974
3975                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3976                         if (ret != ISCSI_CRC_LEN) {
3977                                 iscsit_rx_thread_wait_for_tcp(conn);
3978                                 return;
3979                         }
3980
3981                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3982                                         buffer, ISCSI_HDR_LEN,
3983                                         0, NULL, (u8 *)&checksum);
3984
3985                         if (digest != checksum) {
3986                                 pr_err("HeaderDigest CRC32C failed,"
3987                                         " received 0x%08x, computed 0x%08x\n",
3988                                         digest, checksum);
3989                                 /*
3990                                  * Set the PDU to 0xff so it will intentionally
3991                                  * hit default in the switch below.
3992                                  */
3993                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3994                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3995                         } else {
3996                                 pr_debug("Got HeaderDigest CRC32C"
3997                                                 " 0x%08x\n", checksum);
3998                         }
3999                 }
4000
4001                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4002                         return;
4003
4004                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4005
4006                 if (conn->sess->sess_ops->SessionType &&
4007                    ((!(opcode & ISCSI_OP_TEXT)) ||
4008                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4009                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4010                         " while in Discovery Session, rejecting.\n", opcode);
4011                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4012                                           buffer);
4013                         return;
4014                 }
4015
4016                 ret = iscsi_target_rx_opcode(conn, buffer);
4017                 if (ret < 0)
4018                         return;
4019         }
4020 }
4021
4022 int iscsi_target_rx_thread(void *arg)
4023 {
4024         int rc;
4025         struct iscsi_conn *conn = arg;
4026         bool conn_freed = false;
4027
4028         /*
4029          * Allow ourselves to be interrupted by SIGINT so that a
4030          * connection recovery / failure event can be triggered externally.
4031          */
4032         allow_signal(SIGINT);
4033         /*
4034          * Wait for iscsi_post_login_handler() to complete before allowing
4035          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4036          */
4037         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4038         if (rc < 0 || iscsi_target_check_conn_state(conn))
4039                 goto out;
4040
4041         if (!conn->conn_transport->iscsit_get_rx_pdu)
4042                 return 0;
4043
4044         conn->conn_transport->iscsit_get_rx_pdu(conn);
4045
4046         if (!signal_pending(current))
4047                 atomic_set(&conn->transport_failed, 1);
4048         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4049
4050 out:
4051         if (!conn_freed) {
4052                 while (!kthread_should_stop()) {
4053                         msleep(100);
4054                 }
4055         }
4056
4057         return 0;
4058 }
4059
4060 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4061 {
4062         LIST_HEAD(tmp_list);
4063         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4064         struct iscsi_session *sess = conn->sess;
4065         /*
4066          * We expect this function to only ever be called from either RX or TX
4067          * thread context via iscsit_close_connection() once the other context
4068          * has been reset -> returned sleeping pre-handler state.
4069          */
4070         spin_lock_bh(&conn->cmd_lock);
4071         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4072
4073         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4074                 struct se_cmd *se_cmd = &cmd->se_cmd;
4075
4076                 if (se_cmd->se_tfo != NULL) {
4077                         spin_lock(&se_cmd->t_state_lock);
4078                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4079                         spin_unlock(&se_cmd->t_state_lock);
4080                 }
4081         }
4082         spin_unlock_bh(&conn->cmd_lock);
4083
4084         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4085                 list_del_init(&cmd->i_conn_node);
4086
4087                 iscsit_increment_maxcmdsn(cmd, sess);
4088                 iscsit_free_cmd(cmd, true);
4089
4090         }
4091 }
4092
4093 static void iscsit_stop_timers_for_cmds(
4094         struct iscsi_conn *conn)
4095 {
4096         struct iscsi_cmd *cmd;
4097
4098         spin_lock_bh(&conn->cmd_lock);
4099         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4100                 if (cmd->data_direction == DMA_TO_DEVICE)
4101                         iscsit_stop_dataout_timer(cmd);
4102         }
4103         spin_unlock_bh(&conn->cmd_lock);
4104 }
4105
4106 int iscsit_close_connection(
4107         struct iscsi_conn *conn)
4108 {
4109         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4110         struct iscsi_session    *sess = conn->sess;
4111
4112         pr_debug("Closing iSCSI connection CID %hu on SID:"
4113                 " %u\n", conn->cid, sess->sid);
4114         /*
4115          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4116          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4117          * sleeping and the logout response never got sent because the
4118          * connection failed.
4119          *
4120          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4121          * to signal logout response TX interrupt completion.  Go ahead and skip
4122          * this for iser since isert_rx_opcode() does not wait on logout failure,
4123          * and to avoid iscsi_conn pointer dereference in iser-target code.
4124          */
4125         if (!conn->conn_transport->rdma_shutdown)
4126                 complete(&conn->conn_logout_comp);
4127
4128         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4129                 if (conn->tx_thread &&
4130                     cmpxchg(&conn->tx_thread_active, true, false)) {
4131                         send_sig(SIGINT, conn->tx_thread, 1);
4132                         kthread_stop(conn->tx_thread);
4133                 }
4134         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4135                 if (conn->rx_thread &&
4136                     cmpxchg(&conn->rx_thread_active, true, false)) {
4137                         send_sig(SIGINT, conn->rx_thread, 1);
4138                         kthread_stop(conn->rx_thread);
4139                 }
4140         }
4141
4142         spin_lock(&iscsit_global->ts_bitmap_lock);
4143         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4144                               get_order(1));
4145         spin_unlock(&iscsit_global->ts_bitmap_lock);
4146
4147         iscsit_stop_timers_for_cmds(conn);
4148         iscsit_stop_nopin_response_timer(conn);
4149         iscsit_stop_nopin_timer(conn);
4150
4151         if (conn->conn_transport->iscsit_wait_conn)
4152                 conn->conn_transport->iscsit_wait_conn(conn);
4153
4154         /*
4155          * During Connection recovery drop unacknowledged out of order
4156          * commands for this connection, and prepare the other commands
4157          * for reallegiance.
4158          *
4159          * During normal operation clear the out of order commands (but
4160          * do not free the struct iscsi_ooo_cmdsn's) and release all
4161          * struct iscsi_cmds.
4162          */
4163         if (atomic_read(&conn->connection_recovery)) {
4164                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4165                 iscsit_prepare_cmds_for_reallegiance(conn);
4166         } else {
4167                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4168                 iscsit_release_commands_from_conn(conn);
4169         }
4170         iscsit_free_queue_reqs_for_conn(conn);
4171
4172         /*
4173          * Handle decrementing session or connection usage count if
4174          * a logout response was not able to be sent because the
4175          * connection failed.  Fall back to Session Recovery here.
4176          */
4177         if (atomic_read(&conn->conn_logout_remove)) {
4178                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4179                         iscsit_dec_conn_usage_count(conn);
4180                         iscsit_dec_session_usage_count(sess);
4181                 }
4182                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4183                         iscsit_dec_conn_usage_count(conn);
4184
4185                 atomic_set(&conn->conn_logout_remove, 0);
4186                 atomic_set(&sess->session_reinstatement, 0);
4187                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4188         }
4189
4190         spin_lock_bh(&sess->conn_lock);
4191         list_del(&conn->conn_list);
4192
4193         /*
4194          * Attempt to let the Initiator know this connection failed by
4195          * sending an Connection Dropped Async Message on another
4196          * active connection.
4197          */
4198         if (atomic_read(&conn->connection_recovery))
4199                 iscsit_build_conn_drop_async_message(conn);
4200
4201         spin_unlock_bh(&sess->conn_lock);
4202
4203         /*
4204          * If connection reinstatement is being performed on this connection,
4205          * up the connection reinstatement semaphore that is being blocked on
4206          * in iscsit_cause_connection_reinstatement().
4207          */
4208         spin_lock_bh(&conn->state_lock);
4209         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4210                 spin_unlock_bh(&conn->state_lock);
4211                 complete(&conn->conn_wait_comp);
4212                 wait_for_completion(&conn->conn_post_wait_comp);
4213                 spin_lock_bh(&conn->state_lock);
4214         }
4215
4216         /*
4217          * If connection reinstatement is being performed on this connection
4218          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4219          * connection wait rcfr semaphore that is being blocked on
4220          * an iscsit_connection_reinstatement_rcfr().
4221          */
4222         if (atomic_read(&conn->connection_wait_rcfr)) {
4223                 spin_unlock_bh(&conn->state_lock);
4224                 complete(&conn->conn_wait_rcfr_comp);
4225                 wait_for_completion(&conn->conn_post_wait_comp);
4226                 spin_lock_bh(&conn->state_lock);
4227         }
4228         atomic_set(&conn->connection_reinstatement, 1);
4229         spin_unlock_bh(&conn->state_lock);
4230
4231         /*
4232          * If any other processes are accessing this connection pointer we
4233          * must wait until they have completed.
4234          */
4235         iscsit_check_conn_usage_count(conn);
4236
4237         ahash_request_free(conn->conn_tx_hash);
4238         if (conn->conn_rx_hash) {
4239                 struct crypto_ahash *tfm;
4240
4241                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4242                 ahash_request_free(conn->conn_rx_hash);
4243                 crypto_free_ahash(tfm);
4244         }
4245
4246         free_cpumask_var(conn->conn_cpumask);
4247
4248         kfree(conn->conn_ops);
4249         conn->conn_ops = NULL;
4250
4251         if (conn->sock)
4252                 sock_release(conn->sock);
4253
4254         if (conn->conn_transport->iscsit_free_conn)
4255                 conn->conn_transport->iscsit_free_conn(conn);
4256
4257         iscsit_put_transport(conn->conn_transport);
4258
4259         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4260         conn->conn_state = TARG_CONN_STATE_FREE;
4261         kfree(conn);
4262
4263         spin_lock_bh(&sess->conn_lock);
4264         atomic_dec(&sess->nconn);
4265         pr_debug("Decremented iSCSI connection count to %hu from node:"
4266                 " %s\n", atomic_read(&sess->nconn),
4267                 sess->sess_ops->InitiatorName);
4268         /*
4269          * Make sure that if one connection fails in an non ERL=2 iSCSI
4270          * Session that they all fail.
4271          */
4272         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4273              !atomic_read(&sess->session_logout))
4274                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4275
4276         /*
4277          * If this was not the last connection in the session, and we are
4278          * performing session reinstatement or falling back to ERL=0, call
4279          * iscsit_stop_session() without sleeping to shutdown the other
4280          * active connections.
4281          */
4282         if (atomic_read(&sess->nconn)) {
4283                 if (!atomic_read(&sess->session_reinstatement) &&
4284                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4285                         spin_unlock_bh(&sess->conn_lock);
4286                         return 0;
4287                 }
4288                 if (!atomic_read(&sess->session_stop_active)) {
4289                         atomic_set(&sess->session_stop_active, 1);
4290                         spin_unlock_bh(&sess->conn_lock);
4291                         iscsit_stop_session(sess, 0, 0);
4292                         return 0;
4293                 }
4294                 spin_unlock_bh(&sess->conn_lock);
4295                 return 0;
4296         }
4297
4298         /*
4299          * If this was the last connection in the session and one of the
4300          * following is occurring:
4301          *
4302          * Session Reinstatement is not being performed, and are falling back
4303          * to ERL=0 call iscsit_close_session().
4304          *
4305          * Session Logout was requested.  iscsit_close_session() will be called
4306          * elsewhere.
4307          *
4308          * Session Continuation is not being performed, start the Time2Retain
4309          * handler and check if sleep_on_sess_wait_sem is active.
4310          */
4311         if (!atomic_read(&sess->session_reinstatement) &&
4312              atomic_read(&sess->session_fall_back_to_erl0)) {
4313                 spin_unlock_bh(&sess->conn_lock);
4314                 iscsit_close_session(sess);
4315
4316                 return 0;
4317         } else if (atomic_read(&sess->session_logout)) {
4318                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4319                 sess->session_state = TARG_SESS_STATE_FREE;
4320                 spin_unlock_bh(&sess->conn_lock);
4321
4322                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4323                         complete(&sess->session_wait_comp);
4324
4325                 return 0;
4326         } else {
4327                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4328                 sess->session_state = TARG_SESS_STATE_FAILED;
4329
4330                 if (!atomic_read(&sess->session_continuation)) {
4331                         spin_unlock_bh(&sess->conn_lock);
4332                         iscsit_start_time2retain_handler(sess);
4333                 } else
4334                         spin_unlock_bh(&sess->conn_lock);
4335
4336                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4337                         complete(&sess->session_wait_comp);
4338
4339                 return 0;
4340         }
4341 }
4342
4343 /*
4344  * If the iSCSI Session for the iSCSI Initiator Node exists,
4345  * forcefully shutdown the iSCSI NEXUS.
4346  */
4347 int iscsit_close_session(struct iscsi_session *sess)
4348 {
4349         struct iscsi_portal_group *tpg = sess->tpg;
4350         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4351
4352         if (atomic_read(&sess->nconn)) {
4353                 pr_err("%d connection(s) still exist for iSCSI session"
4354                         " to %s\n", atomic_read(&sess->nconn),
4355                         sess->sess_ops->InitiatorName);
4356                 BUG();
4357         }
4358
4359         spin_lock_bh(&se_tpg->session_lock);
4360         atomic_set(&sess->session_logout, 1);
4361         atomic_set(&sess->session_reinstatement, 1);
4362         iscsit_stop_time2retain_timer(sess);
4363         spin_unlock_bh(&se_tpg->session_lock);
4364
4365         /*
4366          * transport_deregister_session_configfs() will clear the
4367          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4368          * can be setting it again with __transport_register_session() in
4369          * iscsi_post_login_handler() again after the iscsit_stop_session()
4370          * completes in iscsi_np context.
4371          */
4372         transport_deregister_session_configfs(sess->se_sess);
4373
4374         /*
4375          * If any other processes are accessing this session pointer we must
4376          * wait until they have completed.  If we are in an interrupt (the
4377          * time2retain handler) and contain and active session usage count we
4378          * restart the timer and exit.
4379          */
4380         if (!in_interrupt()) {
4381                 if (iscsit_check_session_usage_count(sess) == 1)
4382                         iscsit_stop_session(sess, 1, 1);
4383         } else {
4384                 if (iscsit_check_session_usage_count(sess) == 2) {
4385                         atomic_set(&sess->session_logout, 0);
4386                         iscsit_start_time2retain_handler(sess);
4387                         return 0;
4388                 }
4389         }
4390
4391         transport_deregister_session(sess->se_sess);
4392
4393         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4394                 iscsit_free_connection_recovery_entires(sess);
4395
4396         iscsit_free_all_ooo_cmdsns(sess);
4397
4398         spin_lock_bh(&se_tpg->session_lock);
4399         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4400         sess->session_state = TARG_SESS_STATE_FREE;
4401         pr_debug("Released iSCSI session from node: %s\n",
4402                         sess->sess_ops->InitiatorName);
4403         tpg->nsessions--;
4404         if (tpg->tpg_tiqn)
4405                 tpg->tpg_tiqn->tiqn_nsessions--;
4406
4407         pr_debug("Decremented number of active iSCSI Sessions on"
4408                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4409
4410         spin_lock(&sess_idr_lock);
4411         idr_remove(&sess_idr, sess->session_index);
4412         spin_unlock(&sess_idr_lock);
4413
4414         kfree(sess->sess_ops);
4415         sess->sess_ops = NULL;
4416         spin_unlock_bh(&se_tpg->session_lock);
4417
4418         kfree(sess);
4419         return 0;
4420 }
4421
4422 static void iscsit_logout_post_handler_closesession(
4423         struct iscsi_conn *conn)
4424 {
4425         struct iscsi_session *sess = conn->sess;
4426         int sleep = 1;
4427         /*
4428          * Traditional iscsi/tcp will invoke this logic from TX thread
4429          * context during session logout, so clear tx_thread_active and
4430          * sleep if iscsit_close_connection() has not already occured.
4431          *
4432          * Since iser-target invokes this logic from it's own workqueue,
4433          * always sleep waiting for RX/TX thread shutdown to complete
4434          * within iscsit_close_connection().
4435          */
4436         if (!conn->conn_transport->rdma_shutdown) {
4437                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4438                 if (!sleep)
4439                         return;
4440         }
4441
4442         atomic_set(&conn->conn_logout_remove, 0);
4443         complete(&conn->conn_logout_comp);
4444
4445         iscsit_dec_conn_usage_count(conn);
4446         iscsit_stop_session(sess, sleep, sleep);
4447         iscsit_dec_session_usage_count(sess);
4448         iscsit_close_session(sess);
4449 }
4450
4451 static void iscsit_logout_post_handler_samecid(
4452         struct iscsi_conn *conn)
4453 {
4454         int sleep = 1;
4455
4456         if (!conn->conn_transport->rdma_shutdown) {
4457                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4458                 if (!sleep)
4459                         return;
4460         }
4461
4462         atomic_set(&conn->conn_logout_remove, 0);
4463         complete(&conn->conn_logout_comp);
4464
4465         iscsit_cause_connection_reinstatement(conn, sleep);
4466         iscsit_dec_conn_usage_count(conn);
4467 }
4468
4469 static void iscsit_logout_post_handler_diffcid(
4470         struct iscsi_conn *conn,
4471         u16 cid)
4472 {
4473         struct iscsi_conn *l_conn;
4474         struct iscsi_session *sess = conn->sess;
4475         bool conn_found = false;
4476
4477         if (!sess)
4478                 return;
4479
4480         spin_lock_bh(&sess->conn_lock);
4481         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4482                 if (l_conn->cid == cid) {
4483                         iscsit_inc_conn_usage_count(l_conn);
4484                         conn_found = true;
4485                         break;
4486                 }
4487         }
4488         spin_unlock_bh(&sess->conn_lock);
4489
4490         if (!conn_found)
4491                 return;
4492
4493         if (l_conn->sock)
4494                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4495
4496         spin_lock_bh(&l_conn->state_lock);
4497         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4498         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4499         spin_unlock_bh(&l_conn->state_lock);
4500
4501         iscsit_cause_connection_reinstatement(l_conn, 1);
4502         iscsit_dec_conn_usage_count(l_conn);
4503 }
4504
4505 /*
4506  *      Return of 0 causes the TX thread to restart.
4507  */
4508 int iscsit_logout_post_handler(
4509         struct iscsi_cmd *cmd,
4510         struct iscsi_conn *conn)
4511 {
4512         int ret = 0;
4513
4514         switch (cmd->logout_reason) {
4515         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4516                 switch (cmd->logout_response) {
4517                 case ISCSI_LOGOUT_SUCCESS:
4518                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4519                 default:
4520                         iscsit_logout_post_handler_closesession(conn);
4521                         break;
4522                 }
4523                 ret = 0;
4524                 break;
4525         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4526                 if (conn->cid == cmd->logout_cid) {
4527                         switch (cmd->logout_response) {
4528                         case ISCSI_LOGOUT_SUCCESS:
4529                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4530                         default:
4531                                 iscsit_logout_post_handler_samecid(conn);
4532                                 break;
4533                         }
4534                         ret = 0;
4535                 } else {
4536                         switch (cmd->logout_response) {
4537                         case ISCSI_LOGOUT_SUCCESS:
4538                                 iscsit_logout_post_handler_diffcid(conn,
4539                                         cmd->logout_cid);
4540                                 break;
4541                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4542                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4543                         default:
4544                                 break;
4545                         }
4546                         ret = 1;
4547                 }
4548                 break;
4549         case ISCSI_LOGOUT_REASON_RECOVERY:
4550                 switch (cmd->logout_response) {
4551                 case ISCSI_LOGOUT_SUCCESS:
4552                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4553                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4554                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4555                 default:
4556                         break;
4557                 }
4558                 ret = 1;
4559                 break;
4560         default:
4561                 break;
4562
4563         }
4564         return ret;
4565 }
4566 EXPORT_SYMBOL(iscsit_logout_post_handler);
4567
4568 void iscsit_fail_session(struct iscsi_session *sess)
4569 {
4570         struct iscsi_conn *conn;
4571
4572         spin_lock_bh(&sess->conn_lock);
4573         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4574                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4575                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4576         }
4577         spin_unlock_bh(&sess->conn_lock);
4578
4579         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4580         sess->session_state = TARG_SESS_STATE_FAILED;
4581 }
4582
4583 int iscsit_free_session(struct iscsi_session *sess)
4584 {
4585         u16 conn_count = atomic_read(&sess->nconn);
4586         struct iscsi_conn *conn, *conn_tmp = NULL;
4587         int is_last;
4588
4589         spin_lock_bh(&sess->conn_lock);
4590         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4591
4592         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4593                         conn_list) {
4594                 if (conn_count == 0)
4595                         break;
4596
4597                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4598                         is_last = 1;
4599                 } else {
4600                         iscsit_inc_conn_usage_count(conn_tmp);
4601                         is_last = 0;
4602                 }
4603                 iscsit_inc_conn_usage_count(conn);
4604
4605                 spin_unlock_bh(&sess->conn_lock);
4606                 iscsit_cause_connection_reinstatement(conn, 1);
4607                 spin_lock_bh(&sess->conn_lock);
4608
4609                 iscsit_dec_conn_usage_count(conn);
4610                 if (is_last == 0)
4611                         iscsit_dec_conn_usage_count(conn_tmp);
4612
4613                 conn_count--;
4614         }
4615
4616         if (atomic_read(&sess->nconn)) {
4617                 spin_unlock_bh(&sess->conn_lock);
4618                 wait_for_completion(&sess->session_wait_comp);
4619         } else
4620                 spin_unlock_bh(&sess->conn_lock);
4621
4622         iscsit_close_session(sess);
4623         return 0;
4624 }
4625
4626 void iscsit_stop_session(
4627         struct iscsi_session *sess,
4628         int session_sleep,
4629         int connection_sleep)
4630 {
4631         u16 conn_count = atomic_read(&sess->nconn);
4632         struct iscsi_conn *conn, *conn_tmp = NULL;
4633         int is_last;
4634
4635         spin_lock_bh(&sess->conn_lock);
4636         if (session_sleep)
4637                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4638
4639         if (connection_sleep) {
4640                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4641                                 conn_list) {
4642                         if (conn_count == 0)
4643                                 break;
4644
4645                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4646                                 is_last = 1;
4647                         } else {
4648                                 iscsit_inc_conn_usage_count(conn_tmp);
4649                                 is_last = 0;
4650                         }
4651                         iscsit_inc_conn_usage_count(conn);
4652
4653                         spin_unlock_bh(&sess->conn_lock);
4654                         iscsit_cause_connection_reinstatement(conn, 1);
4655                         spin_lock_bh(&sess->conn_lock);
4656
4657                         iscsit_dec_conn_usage_count(conn);
4658                         if (is_last == 0)
4659                                 iscsit_dec_conn_usage_count(conn_tmp);
4660                         conn_count--;
4661                 }
4662         } else {
4663                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4664                         iscsit_cause_connection_reinstatement(conn, 0);
4665         }
4666
4667         if (session_sleep && atomic_read(&sess->nconn)) {
4668                 spin_unlock_bh(&sess->conn_lock);
4669                 wait_for_completion(&sess->session_wait_comp);
4670         } else
4671                 spin_unlock_bh(&sess->conn_lock);
4672 }
4673
4674 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4675 {
4676         struct iscsi_session *sess;
4677         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4678         struct se_session *se_sess, *se_sess_tmp;
4679         LIST_HEAD(free_list);
4680         int session_count = 0;
4681
4682         spin_lock_bh(&se_tpg->session_lock);
4683         if (tpg->nsessions && !force) {
4684                 spin_unlock_bh(&se_tpg->session_lock);
4685                 return -1;
4686         }
4687
4688         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4689                         sess_list) {
4690                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4691
4692                 spin_lock(&sess->conn_lock);
4693                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4694                     atomic_read(&sess->session_logout) ||
4695                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4696                         spin_unlock(&sess->conn_lock);
4697                         continue;
4698                 }
4699                 atomic_set(&sess->session_reinstatement, 1);
4700                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4701                 spin_unlock(&sess->conn_lock);
4702
4703                 list_move_tail(&se_sess->sess_list, &free_list);
4704         }
4705         spin_unlock_bh(&se_tpg->session_lock);
4706
4707         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4708                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4709
4710                 iscsit_free_session(sess);
4711                 session_count++;
4712         }
4713
4714         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4715                         " Group: %hu\n", session_count, tpg->tpgt);
4716         return 0;
4717 }
4718
4719 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4720 MODULE_VERSION("4.1.x");
4721 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4722 MODULE_LICENSE("GPL");
4723
4724 module_init(iscsi_target_init_module);
4725 module_exit(iscsi_target_cleanup_module);