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 <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_SPINLOCK(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->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         }
 302
 303         if ((ip_match == true) && (np->np_port == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 static struct iscsi_np *iscsit_get_np(
 311         struct __kernel_sockaddr_storage *sockaddr,
 312         int network_transport)
 313 {
 314         struct iscsi_np *np;
 315         bool match;
 316
 317         spin_lock_bh(&np_lock);
 318         list_for_each_entry(np, &g_np_list, np_list) {
 319                 spin_lock(&np->np_thread_lock);
 320                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 321                         spin_unlock(&np->np_thread_lock);
 322                         continue;
 323                 }
 324
 325                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 326                 if (match == true) {
 327                         /*
 328                          * Increment the np_exports reference count now to
 329                          * prevent iscsit_del_np() below from being called
 330                          * while iscsi_tpg_add_network_portal() is called.
 331                          */
 332                         np->np_exports++;
 333                         spin_unlock(&np->np_thread_lock);
 334                         spin_unlock_bh(&np_lock);
 335                         return np;
 336                 }
 337                 spin_unlock(&np->np_thread_lock);
 338         }
 339         spin_unlock_bh(&np_lock);
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np)
 358                 return np;
 359
 360         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 361         if (!np) {
 362                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 363                 return ERR_PTR(-ENOMEM);
 364         }
 365
 366         np->np_flags |= NPF_IP_NETWORK;
 367         if (sockaddr->ss_family == AF_INET6) {
 368                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 369                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in6->sin6_port);
 371         } else {
 372                 sock_in = (struct sockaddr_in *)sockaddr;
 373                 sprintf(np->np_ip, "%s", ip_str);
 374                 np->np_port = ntohs(sock_in->sin_port);
 375         }
 376
 377         np->np_network_transport = network_transport;
 378         spin_lock_init(&np->np_thread_lock);
 379         init_completion(&np->np_restart_comp);
 380         INIT_LIST_HEAD(&np->np_list);
 381
 382         ret = iscsi_target_setup_login_socket(np, sockaddr);
 383         if (ret != 0) {
 384                 kfree(np);
 385                 return ERR_PTR(ret);
 386         }
 387
 388         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 389         if (IS_ERR(np->np_thread)) {
 390                 pr_err("Unable to create kthread: iscsi_np\n");
 391                 ret = PTR_ERR(np->np_thread);
 392                 kfree(np);
 393                 return ERR_PTR(ret);
 394         }
 395         /*
 396          * Increment the np_exports reference count now to prevent
 397          * iscsit_del_np() below from being run while a new call to
 398          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 399          * active.  We don't need to hold np->np_thread_lock at this
 400          * point because iscsi_np has not been added to g_np_list yet.
 401          */
 402         np->np_exports = 1;
 403
 404         spin_lock_bh(&np_lock);
 405         list_add_tail(&np->np_list, &g_np_list);
 406         spin_unlock_bh(&np_lock);
 407
 408         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 409                 np->np_ip, np->np_port, np->np_transport->name);
 410
 411         return np;
 412 }
 413
 414 int iscsit_reset_np_thread(
 415         struct iscsi_np *np,
 416         struct iscsi_tpg_np *tpg_np,
 417         struct iscsi_portal_group *tpg,
 418         bool shutdown)
 419 {
 420         spin_lock_bh(&np->np_thread_lock);
 421         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 422                 spin_unlock_bh(&np->np_thread_lock);
 423                 return 0;
 424         }
 425         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 426
 427         if (np->np_thread) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 send_sig(SIGINT, np->np_thread, 1);
 430                 wait_for_completion(&np->np_restart_comp);
 431                 spin_lock_bh(&np->np_thread_lock);
 432         }
 433         spin_unlock_bh(&np->np_thread_lock);
 434
 435         if (tpg_np && shutdown) {
 436                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 437
 438                 wait_for_completion(&tpg_np->tpg_np_comp);
 439         }
 440
 441         return 0;
 442 }
 443
 444 static void iscsit_free_np(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448 }
 449
 450 int iscsit_del_np(struct iscsi_np *np)
 451 {
 452         spin_lock_bh(&np->np_thread_lock);
 453         np->np_exports--;
 454         if (np->np_exports) {
 455                 spin_unlock_bh(&np->np_thread_lock);
 456                 return 0;
 457         }
 458         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 459         spin_unlock_bh(&np->np_thread_lock);
 460
 461         if (np->np_thread) {
 462                 /*
 463                  * We need to send the signal to wakeup Linux/Net
 464                  * which may be sleeping in sock_accept()..
 465                  */
 466                 send_sig(SIGINT, np->np_thread, 1);
 467                 kthread_stop(np->np_thread);
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486
 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 488 {
 489         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 490         return 0;
 491 }
 492
 493 static struct iscsit_transport iscsi_target_transport = {
 494         .name                   = "iSCSI/TCP",
 495         .transport_type         = ISCSI_TCP,
 496         .owner                  = NULL,
 497         .iscsit_setup_np        = iscsit_setup_np,
 498         .iscsit_accept_np       = iscsit_accept_np,
 499         .iscsit_free_np         = iscsit_free_np,
 500         .iscsit_get_login_rx    = iscsit_get_login_rx,
 501         .iscsit_put_login_tx    = iscsit_put_login_tx,
 502         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 503         .iscsit_immediate_queue = iscsit_immediate_queue,
 504         .iscsit_response_queue  = iscsit_response_queue,
 505         .iscsit_queue_data_in   = iscsit_queue_rsp,
 506         .iscsit_queue_status    = iscsit_queue_rsp,
 507 };
 508
 509 static int __init iscsi_target_init_module(void)
 510 {
 511         int ret = 0;
 512
 513         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 514
 515         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 516         if (!iscsit_global) {
 517                 pr_err("Unable to allocate memory for iscsit_global\n");
 518                 return -1;
 519         }
 520         mutex_init(&auth_id_lock);
 521         spin_lock_init(&sess_idr_lock);
 522         idr_init(&tiqn_idr);
 523         idr_init(&sess_idr);
 524
 525         ret = iscsi_target_register_configfs();
 526         if (ret < 0)
 527                 goto out;
 528
 529         ret = iscsi_thread_set_init();
 530         if (ret < 0)
 531                 goto configfs_out;
 532
 533         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 534                         TARGET_THREAD_SET_COUNT) {
 535                 pr_err("iscsi_allocate_thread_sets() returned"
 536                         " unexpected value!\n");
 537                 goto ts_out1;
 538         }
 539
 540         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 541                         sizeof(struct iscsi_queue_req),
 542                         __alignof__(struct iscsi_queue_req), 0, NULL);
 543         if (!lio_qr_cache) {
 544                 pr_err("nable to kmem_cache_create() for"
 545                                 " lio_qr_cache\n");
 546                 goto ts_out2;
 547         }
 548
 549         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 550                         sizeof(struct iscsi_datain_req),
 551                         __alignof__(struct iscsi_datain_req), 0, NULL);
 552         if (!lio_dr_cache) {
 553                 pr_err("Unable to kmem_cache_create() for"
 554                                 " lio_dr_cache\n");
 555                 goto qr_out;
 556         }
 557
 558         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 559                         sizeof(struct iscsi_ooo_cmdsn),
 560                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 561         if (!lio_ooo_cache) {
 562                 pr_err("Unable to kmem_cache_create() for"
 563                                 " lio_ooo_cache\n");
 564                 goto dr_out;
 565         }
 566
 567         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 568                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 569                         0, NULL);
 570         if (!lio_r2t_cache) {
 571                 pr_err("Unable to kmem_cache_create() for"
 572                                 " lio_r2t_cache\n");
 573                 goto ooo_out;
 574         }
 575
 576         iscsit_register_transport(&iscsi_target_transport);
 577
 578         if (iscsit_load_discovery_tpg() < 0)
 579                 goto r2t_out;
 580
 581         return ret;
 582 r2t_out:
 583         kmem_cache_destroy(lio_r2t_cache);
 584 ooo_out:
 585         kmem_cache_destroy(lio_ooo_cache);
 586 dr_out:
 587         kmem_cache_destroy(lio_dr_cache);
 588 qr_out:
 589         kmem_cache_destroy(lio_qr_cache);
 590 ts_out2:
 591         iscsi_deallocate_thread_sets();
 592 ts_out1:
 593         iscsi_thread_set_free();
 594 configfs_out:
 595         iscsi_target_deregister_configfs();
 596 out:
 597         kfree(iscsit_global);
 598         return -ENOMEM;
 599 }
 600
 601 static void __exit iscsi_target_cleanup_module(void)
 602 {
 603         iscsi_deallocate_thread_sets();
 604         iscsi_thread_set_free();
 605         iscsit_release_discovery_tpg();
 606         iscsit_unregister_transport(&iscsi_target_transport);
 607         kmem_cache_destroy(lio_qr_cache);
 608         kmem_cache_destroy(lio_dr_cache);
 609         kmem_cache_destroy(lio_ooo_cache);
 610         kmem_cache_destroy(lio_r2t_cache);
 611
 612         iscsi_target_deregister_configfs();
 613
 614         kfree(iscsit_global);
 615 }
 616
 617 static int iscsit_add_reject(
 618         struct iscsi_conn *conn,
 619         u8 reason,
 620         unsigned char *buf)
 621 {
 622         struct iscsi_cmd *cmd;
 623
 624         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 625         if (!cmd)
 626                 return -1;
 627
 628         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 629         cmd->reject_reason = reason;
 630
 631         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 632         if (!cmd->buf_ptr) {
 633                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 634                 iscsit_free_cmd(cmd, false);
 635                 return -1;
 636         }
 637
 638         spin_lock_bh(&conn->cmd_lock);
 639         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 640         spin_unlock_bh(&conn->cmd_lock);
 641
 642         cmd->i_state = ISTATE_SEND_REJECT;
 643         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 644
 645         return -1;
 646 }
 647
 648 static int iscsit_add_reject_from_cmd(
 649         struct iscsi_cmd *cmd,
 650         u8 reason,
 651         bool add_to_conn,
 652         unsigned char *buf)
 653 {
 654         struct iscsi_conn *conn;
 655
 656         if (!cmd->conn) {
 657                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 658                                 cmd->init_task_tag);
 659                 return -1;
 660         }
 661         conn = cmd->conn;
 662
 663         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 664         cmd->reject_reason = reason;
 665
 666         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 667         if (!cmd->buf_ptr) {
 668                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 669                 iscsit_free_cmd(cmd, false);
 670                 return -1;
 671         }
 672
 673         if (add_to_conn) {
 674                 spin_lock_bh(&conn->cmd_lock);
 675                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 676                 spin_unlock_bh(&conn->cmd_lock);
 677         }
 678
 679         cmd->i_state = ISTATE_SEND_REJECT;
 680         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 681         /*
 682          * Perform the kref_put now if se_cmd has already been setup by
 683          * scsit_setup_scsi_cmd()
 684          */
 685         if (cmd->se_cmd.se_tfo != NULL) {
 686                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 687                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 688         }
 689         return -1;
 690 }
 691
 692 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 693                                  unsigned char *buf)
 694 {
 695         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 696 }
 697
 698 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 699 {
 700         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 701 }
 702
 703 /*
 704  * Map some portion of the allocated scatterlist to an iovec, suitable for
 705  * kernel sockets to copy data in/out.
 706  */
 707 static int iscsit_map_iovec(
 708         struct iscsi_cmd *cmd,
 709         struct kvec *iov,
 710         u32 data_offset,
 711         u32 data_length)
 712 {
 713         u32 i = 0;
 714         struct scatterlist *sg;
 715         unsigned int page_off;
 716
 717         /*
 718          * We know each entry in t_data_sg contains a page.
 719          */
 720         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 721         page_off = (data_offset % PAGE_SIZE);
 722
 723         cmd->first_data_sg = sg;
 724         cmd->first_data_sg_off = page_off;
 725
 726         while (data_length) {
 727                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 728
 729                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 730                 iov[i].iov_len = cur_len;
 731
 732                 data_length -= cur_len;
 733                 page_off = 0;
 734                 sg = sg_next(sg);
 735                 i++;
 736         }
 737
 738         cmd->kmapped_nents = i;
 739
 740         return i;
 741 }
 742
 743 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 744 {
 745         u32 i;
 746         struct scatterlist *sg;
 747
 748         sg = cmd->first_data_sg;
 749
 750         for (i = 0; i < cmd->kmapped_nents; i++)
 751                 kunmap(sg_page(&sg[i]));
 752 }
 753
 754 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 755 {
 756         LIST_HEAD(ack_list);
 757         struct iscsi_cmd *cmd, *cmd_p;
 758
 759         conn->exp_statsn = exp_statsn;
 760
 761         if (conn->sess->sess_ops->RDMAExtensions)
 762                 return;
 763
 764         spin_lock_bh(&conn->cmd_lock);
 765         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 766                 spin_lock(&cmd->istate_lock);
 767                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 768                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 769                         cmd->i_state = ISTATE_REMOVE;
 770                         spin_unlock(&cmd->istate_lock);
 771                         list_move_tail(&cmd->i_conn_node, &ack_list);
 772                         continue;
 773                 }
 774                 spin_unlock(&cmd->istate_lock);
 775         }
 776         spin_unlock_bh(&conn->cmd_lock);
 777
 778         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 779                 list_del(&cmd->i_conn_node);
 780                 iscsit_free_cmd(cmd, false);
 781         }
 782 }
 783
 784 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 785 {
 786         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 787
 788         iov_count += ISCSI_IOV_DATA_BUFFER;
 789
 790         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 791         if (!cmd->iov_data) {
 792                 pr_err("Unable to allocate cmd->iov_data\n");
 793                 return -ENOMEM;
 794         }
 795
 796         cmd->orig_iov_data_count = iov_count;
 797         return 0;
 798 }
 799
 800 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 801                           unsigned char *buf)
 802 {
 803         int data_direction, payload_length;
 804         struct iscsi_scsi_req *hdr;
 805         int iscsi_task_attr;
 806         int sam_task_attr;
 807
 808         atomic_long_inc(&conn->sess->cmd_pdus);
 809
 810         hdr                     = (struct iscsi_scsi_req *) buf;
 811         payload_length          = ntoh24(hdr->dlength);
 812
 813         /* FIXME; Add checks for AdditionalHeaderSegment */
 814
 815         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 816             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 817                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 818                                 " not set. Bad iSCSI Initiator.\n");
 819                 return iscsit_add_reject_cmd(cmd,
 820                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 821         }
 822
 823         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 824              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 825                 /*
 826                  * From RFC-3720 Section 10.3.1:
 827                  *
 828                  * "Either or both of R and W MAY be 1 when either the
 829                  *  Expected Data Transfer Length and/or Bidirectional Read
 830                  *  Expected Data Transfer Length are 0"
 831                  *
 832                  * For this case, go ahead and clear the unnecssary bits
 833                  * to avoid any confusion with ->data_direction.
 834                  */
 835                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 836                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 837
 838                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 839                         " set when Expected Data Transfer Length is 0 for"
 840                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 841         }
 842
 843         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 844             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 845                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 846                         " MUST be set if Expected Data Transfer Length is not 0."
 847                         " Bad iSCSI Initiator\n");
 848                 return iscsit_add_reject_cmd(cmd,
 849                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 850         }
 851
 852         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 853             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 854                 pr_err("Bidirectional operations not supported!\n");
 855                 return iscsit_add_reject_cmd(cmd,
 856                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 857         }
 858
 859         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 860                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 861                                 " Scsi Command PDU.\n");
 862                 return iscsit_add_reject_cmd(cmd,
 863                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 864         }
 865
 866         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 867                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 868                         " protocol error.\n", payload_length);
 869                 return iscsit_add_reject_cmd(cmd,
 870                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 871         }
 872
 873         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 874             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 875                 pr_err("Expected Data Transfer Length and Length of"
 876                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 877                         " bit is not set protocol error\n");
 878                 return iscsit_add_reject_cmd(cmd,
 879                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 880         }
 881
 882         if (payload_length > be32_to_cpu(hdr->data_length)) {
 883                 pr_err("DataSegmentLength: %u is greater than"
 884                         " EDTL: %u, protocol error.\n", payload_length,
 885                                 hdr->data_length);
 886                 return iscsit_add_reject_cmd(cmd,
 887                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 888         }
 889
 890         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 891                 pr_err("DataSegmentLength: %u is greater than"
 892                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 893                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 894                 return iscsit_add_reject_cmd(cmd,
 895                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 896         }
 897
 898         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 899                 pr_err("DataSegmentLength: %u is greater than"
 900                         " FirstBurstLength: %u, protocol error.\n",
 901                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 902                 return iscsit_add_reject_cmd(cmd,
 903                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 904         }
 905
 906         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 907                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 908                           DMA_NONE;
 909
 910         cmd->data_direction = data_direction;
 911         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 912         /*
 913          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 914          */
 915         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 916             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 917                 sam_task_attr = MSG_SIMPLE_TAG;
 918         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 919                 sam_task_attr = MSG_ORDERED_TAG;
 920         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 921                 sam_task_attr = MSG_HEAD_TAG;
 922         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 923                 sam_task_attr = MSG_ACA_TAG;
 924         else {
 925                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 926                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 927                 sam_task_attr = MSG_SIMPLE_TAG;
 928         }
 929
 930         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 931         cmd->i_state            = ISTATE_NEW_CMD;
 932         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 933         cmd->immediate_data     = (payload_length) ? 1 : 0;
 934         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 935                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 936         if (cmd->unsolicited_data)
 937                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 938
 939         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 940         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 941                 spin_lock_bh(&conn->sess->ttt_lock);
 942                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 943                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 944                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 945                 spin_unlock_bh(&conn->sess->ttt_lock);
 946         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 947                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 948         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 949         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 950         cmd->first_burst_len    = payload_length;
 951
 952         if (!conn->sess->sess_ops->RDMAExtensions &&
 953              cmd->data_direction == DMA_FROM_DEVICE) {
 954                 struct iscsi_datain_req *dr;
 955
 956                 dr = iscsit_allocate_datain_req();
 957                 if (!dr)
 958                         return iscsit_add_reject_cmd(cmd,
 959                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 960
 961                 iscsit_attach_datain_req(cmd, dr);
 962         }
 963
 964         /*
 965          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 966          */
 967         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 968                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 969                         cmd->data_direction, sam_task_attr,
 970                         cmd->sense_buffer + 2);
 971
 972         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 973                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 974                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 975                 conn->cid);
 976
 977         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
 978
 979         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 980                                                      scsilun_to_int(&hdr->lun));
 981         if (cmd->sense_reason)
 982                 goto attach_cmd;
 983
 984         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 985         if (cmd->sense_reason) {
 986                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
 987                         return iscsit_add_reject_cmd(cmd,
 988                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 989                 }
 990
 991                 goto attach_cmd;
 992         }
 993
 994         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
 995                 return iscsit_add_reject_cmd(cmd,
 996                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 997         }
 998
 999 attach_cmd:
1000         spin_lock_bh(&conn->cmd_lock);
1001         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1002         spin_unlock_bh(&conn->cmd_lock);
1003         /*
1004          * Check if we need to delay processing because of ALUA
1005          * Active/NonOptimized primary access state..
1006          */
1007         core_alua_check_nonop_delay(&cmd->se_cmd);
1008
1009         return 0;
1010 }
1011 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1012
1013 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1014 {
1015         iscsit_set_dataout_sequence_values(cmd);
1016
1017         spin_lock_bh(&cmd->dataout_timeout_lock);
1018         iscsit_start_dataout_timer(cmd, cmd->conn);
1019         spin_unlock_bh(&cmd->dataout_timeout_lock);
1020 }
1021 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1022
1023 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1024                             struct iscsi_scsi_req *hdr)
1025 {
1026         int cmdsn_ret = 0;
1027         /*
1028          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1029          * the Immediate Bit is not set, and no Immediate
1030          * Data is attached.
1031          *
1032          * A PDU/CmdSN carrying Immediate Data can only
1033          * be processed after the DataCRC has passed.
1034          * If the DataCRC fails, the CmdSN MUST NOT
1035          * be acknowledged. (See below)
1036          */
1037         if (!cmd->immediate_data) {
1038                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1039                                         (unsigned char *)hdr, hdr->cmdsn);
1040                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1041                         return -1;
1042                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1043                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1044                         return 0;
1045                 }
1046         }
1047
1048         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1049
1050         /*
1051          * If no Immediate Data is attached, it's OK to return now.
1052          */
1053         if (!cmd->immediate_data) {
1054                 if (!cmd->sense_reason && cmd->unsolicited_data)
1055                         iscsit_set_unsoliticed_dataout(cmd);
1056                 if (!cmd->sense_reason)
1057                         return 0;
1058
1059                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1060                 return 0;
1061         }
1062
1063         /*
1064          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1065          * execution.  These exceptions are processed in CmdSN order using
1066          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1067          */
1068         if (cmd->sense_reason) {
1069                 if (cmd->reject_reason)
1070                         return 0;
1071
1072                 return 1;
1073         }
1074         /*
1075          * Call directly into transport_generic_new_cmd() to perform
1076          * the backend memory allocation.
1077          */
1078         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1079         if (cmd->sense_reason)
1080                 return 1;
1081
1082         return 0;
1083 }
1084 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1085
1086 static int
1087 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1088                           bool dump_payload)
1089 {
1090         struct iscsi_conn *conn = cmd->conn;
1091         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1092         /*
1093          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1094          */
1095         if (dump_payload == true)
1096                 goto after_immediate_data;
1097
1098         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1099                                         cmd->first_burst_len);
1100 after_immediate_data:
1101         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1102                 /*
1103                  * A PDU/CmdSN carrying Immediate Data passed
1104                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1105                  * Immediate Bit is not set.
1106                  */
1107                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1108                                         (unsigned char *)hdr, hdr->cmdsn);
1109                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1110                         return -1;
1111
1112                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1113                         int rc;
1114
1115                         rc = iscsit_dump_data_payload(cmd->conn,
1116                                                       cmd->first_burst_len, 1);
1117                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1118                         return rc;
1119                 } else if (cmd->unsolicited_data)
1120                         iscsit_set_unsoliticed_dataout(cmd);
1121
1122         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1123                 /*
1124                  * Immediate Data failed DataCRC and ERL>=1,
1125                  * silently drop this PDU and let the initiator
1126                  * plug the CmdSN gap.
1127                  *
1128                  * FIXME: Send Unsolicited NOPIN with reserved
1129                  * TTT here to help the initiator figure out
1130                  * the missing CmdSN, although they should be
1131                  * intelligent enough to determine the missing
1132                  * CmdSN and issue a retry to plug the sequence.
1133                  */
1134                 cmd->i_state = ISTATE_REMOVE;
1135                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1136         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1137                 return -1;
1138
1139         return 0;
1140 }
1141
1142 static int
1143 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1144                            unsigned char *buf)
1145 {
1146         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1147         int rc, immed_data;
1148         bool dump_payload = false;
1149
1150         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1151         if (rc < 0)
1152                 return 0;
1153         /*
1154          * Allocation iovecs needed for struct socket operations for
1155          * traditional iSCSI block I/O.
1156          */
1157         if (iscsit_allocate_iovecs(cmd) < 0) {
1158                 return iscsit_add_reject_cmd(cmd,
1159                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1160         }
1161         immed_data = cmd->immediate_data;
1162
1163         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1164         if (rc < 0)
1165                 return rc;
1166         else if (rc > 0)
1167                 dump_payload = true;
1168
1169         if (!immed_data)
1170                 return 0;
1171
1172         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1173 }
1174
1175 static u32 iscsit_do_crypto_hash_sg(
1176         struct hash_desc *hash,
1177         struct iscsi_cmd *cmd,
1178         u32 data_offset,
1179         u32 data_length,
1180         u32 padding,
1181         u8 *pad_bytes)
1182 {
1183         u32 data_crc;
1184         u32 i;
1185         struct scatterlist *sg;
1186         unsigned int page_off;
1187
1188         crypto_hash_init(hash);
1189
1190         sg = cmd->first_data_sg;
1191         page_off = cmd->first_data_sg_off;
1192
1193         i = 0;
1194         while (data_length) {
1195                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1196
1197                 crypto_hash_update(hash, &sg[i], cur_len);
1198
1199                 data_length -= cur_len;
1200                 page_off = 0;
1201                 i++;
1202         }
1203
1204         if (padding) {
1205                 struct scatterlist pad_sg;
1206
1207                 sg_init_one(&pad_sg, pad_bytes, padding);
1208                 crypto_hash_update(hash, &pad_sg, padding);
1209         }
1210         crypto_hash_final(hash, (u8 *) &data_crc);
1211
1212         return data_crc;
1213 }
1214
1215 static void iscsit_do_crypto_hash_buf(
1216         struct hash_desc *hash,
1217         const void *buf,
1218         u32 payload_length,
1219         u32 padding,
1220         u8 *pad_bytes,
1221         u8 *data_crc)
1222 {
1223         struct scatterlist sg;
1224
1225         crypto_hash_init(hash);
1226
1227         sg_init_one(&sg, buf, payload_length);
1228         crypto_hash_update(hash, &sg, payload_length);
1229
1230         if (padding) {
1231                 sg_init_one(&sg, pad_bytes, padding);
1232                 crypto_hash_update(hash, &sg, padding);
1233         }
1234         crypto_hash_final(hash, data_crc);
1235 }
1236
1237 int
1238 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1239                           struct iscsi_cmd **out_cmd)
1240 {
1241         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1242         struct iscsi_cmd *cmd = NULL;
1243         struct se_cmd *se_cmd;
1244         u32 payload_length = ntoh24(hdr->dlength);
1245         int rc;
1246
1247         if (!payload_length) {
1248                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1249                 return 0;
1250         }
1251
1252         /* iSCSI write */
1253         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1254
1255         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1256                 pr_err("DataSegmentLength: %u is greater than"
1257                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1258                         conn->conn_ops->MaxXmitDataSegmentLength);
1259                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1260                                          buf);
1261         }
1262
1263         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1264                         payload_length);
1265         if (!cmd)
1266                 return 0;
1267
1268         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1269                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1270                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1271                 payload_length, conn->cid);
1272
1273         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1274                 pr_err("Command ITT: 0x%08x received DataOUT after"
1275                         " last DataOUT received, dumping payload\n",
1276                         cmd->init_task_tag);
1277                 return iscsit_dump_data_payload(conn, payload_length, 1);
1278         }
1279
1280         if (cmd->data_direction != DMA_TO_DEVICE) {
1281                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1282                         " NON-WRITE command.\n", cmd->init_task_tag);
1283                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1284         }
1285         se_cmd = &cmd->se_cmd;
1286         iscsit_mod_dataout_timer(cmd);
1287
1288         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1289                 pr_err("DataOut Offset: %u, Length %u greater than"
1290                         " iSCSI Command EDTL %u, protocol error.\n",
1291                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1292                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1293         }
1294
1295         if (cmd->unsolicited_data) {
1296                 int dump_unsolicited_data = 0;
1297
1298                 if (conn->sess->sess_ops->InitialR2T) {
1299                         pr_err("Received unexpected unsolicited data"
1300                                 " while InitialR2T=Yes, protocol error.\n");
1301                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1302                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1303                         return -1;
1304                 }
1305                 /*
1306                  * Special case for dealing with Unsolicited DataOUT
1307                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1308                  * failures;
1309                  */
1310
1311                 /* Something's amiss if we're not in WRITE_PENDING state... */
1312                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1313                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1314                         dump_unsolicited_data = 1;
1315
1316                 if (dump_unsolicited_data) {
1317                         /*
1318                          * Check if a delayed TASK_ABORTED status needs to
1319                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1320                          * received with the unsolicitied data out.
1321                          */
1322                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1323                                 iscsit_stop_dataout_timer(cmd);
1324
1325                         transport_check_aborted_status(se_cmd,
1326                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1327                         return iscsit_dump_data_payload(conn, payload_length, 1);
1328                 }
1329         } else {
1330                 /*
1331                  * For the normal solicited data path:
1332                  *
1333                  * Check for a delayed TASK_ABORTED status and dump any
1334                  * incoming data out payload if one exists.  Also, when the
1335                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1336                  * data out sequence, we decrement outstanding_r2ts.  Once
1337                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1338                  * TASK_ABORTED status.
1339                  */
1340                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1341                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1342                                 if (--cmd->outstanding_r2ts < 1) {
1343                                         iscsit_stop_dataout_timer(cmd);
1344                                         transport_check_aborted_status(
1345                                                         se_cmd, 1);
1346                                 }
1347
1348                         return iscsit_dump_data_payload(conn, payload_length, 1);
1349                 }
1350         }
1351         /*
1352          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1353          * within-command recovery checks before receiving the payload.
1354          */
1355         rc = iscsit_check_pre_dataout(cmd, buf);
1356         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1357                 return 0;
1358         else if (rc == DATAOUT_CANNOT_RECOVER)
1359                 return -1;
1360
1361         *out_cmd = cmd;
1362         return 0;
1363 }
1364 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1365
1366 static int
1367 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1368                    struct iscsi_data *hdr)
1369 {
1370         struct kvec *iov;
1371         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1372         u32 payload_length = ntoh24(hdr->dlength);
1373         int iov_ret, data_crc_failed = 0;
1374
1375         rx_size += payload_length;
1376         iov = &cmd->iov_data[0];
1377
1378         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1379                                    payload_length);
1380         if (iov_ret < 0)
1381                 return -1;
1382
1383         iov_count += iov_ret;
1384
1385         padding = ((-payload_length) & 3);
1386         if (padding != 0) {
1387                 iov[iov_count].iov_base = cmd->pad_bytes;
1388                 iov[iov_count++].iov_len = padding;
1389                 rx_size += padding;
1390                 pr_debug("Receiving %u padding bytes.\n", padding);
1391         }
1392
1393         if (conn->conn_ops->DataDigest) {
1394                 iov[iov_count].iov_base = &checksum;
1395                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1396                 rx_size += ISCSI_CRC_LEN;
1397         }
1398
1399         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1400
1401         iscsit_unmap_iovec(cmd);
1402
1403         if (rx_got != rx_size)
1404                 return -1;
1405
1406         if (conn->conn_ops->DataDigest) {
1407                 u32 data_crc;
1408
1409                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1410                                                     be32_to_cpu(hdr->offset),
1411                                                     payload_length, padding,
1412                                                     cmd->pad_bytes);
1413
1414                 if (checksum != data_crc) {
1415                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1416                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1417                                 " does not match computed 0x%08x\n",
1418                                 hdr->itt, hdr->offset, payload_length,
1419                                 hdr->datasn, checksum, data_crc);
1420                         data_crc_failed = 1;
1421                 } else {
1422                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1423                                 " %u bytes of Data Out\n", checksum,
1424                                 payload_length);
1425                 }
1426         }
1427
1428         return data_crc_failed;
1429 }
1430
1431 int
1432 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1433                              bool data_crc_failed)
1434 {
1435         struct iscsi_conn *conn = cmd->conn;
1436         int rc, ooo_cmdsn;
1437         /*
1438          * Increment post receive data and CRC values or perform
1439          * within-command recovery.
1440          */
1441         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1442         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1443                 return 0;
1444         else if (rc == DATAOUT_SEND_R2T) {
1445                 iscsit_set_dataout_sequence_values(cmd);
1446                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1447         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1448                 /*
1449                  * Handle extra special case for out of order
1450                  * Unsolicited Data Out.
1451                  */
1452                 spin_lock_bh(&cmd->istate_lock);
1453                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1454                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1455                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1456                 spin_unlock_bh(&cmd->istate_lock);
1457
1458                 iscsit_stop_dataout_timer(cmd);
1459                 if (ooo_cmdsn)
1460                         return 0;
1461                 target_execute_cmd(&cmd->se_cmd);
1462                 return 0;
1463         } else /* DATAOUT_CANNOT_RECOVER */
1464                 return -1;
1465
1466         return 0;
1467 }
1468 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1469
1470 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1471 {
1472         struct iscsi_cmd *cmd = NULL;
1473         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1474         int rc;
1475         bool data_crc_failed = false;
1476
1477         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1478         if (rc < 0)
1479                 return 0;
1480         else if (!cmd)
1481                 return 0;
1482
1483         rc = iscsit_get_dataout(conn, cmd, hdr);
1484         if (rc < 0)
1485                 return rc;
1486         else if (rc > 0)
1487                 data_crc_failed = true;
1488
1489         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1490 }
1491
1492 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1493                          struct iscsi_nopout *hdr)
1494 {
1495         u32 payload_length = ntoh24(hdr->dlength);
1496
1497         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1498                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1499                         " not set, protocol error.\n");
1500                 if (!cmd)
1501                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1502                                                  (unsigned char *)hdr);
1503
1504                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1505                                          (unsigned char *)hdr);
1506         }
1507
1508         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1509                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1510                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1511                         " error.\n", payload_length,
1512                         conn->conn_ops->MaxXmitDataSegmentLength);
1513                 if (!cmd)
1514                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1515                                                  (unsigned char *)hdr);
1516
1517                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1518                                          (unsigned char *)hdr);
1519         }
1520
1521         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1522                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1523                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1524                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1525                 payload_length);
1526         /*
1527          * This is not a response to a Unsolicited NopIN, which means
1528          * it can either be a NOPOUT ping request (with a valid ITT),
1529          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1530          * Either way, make sure we allocate an struct iscsi_cmd, as both
1531          * can contain ping data.
1532          */
1533         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1534                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1535                 cmd->i_state            = ISTATE_SEND_NOPIN;
1536                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1537                                                 1 : 0);
1538                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1539                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1540                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1541                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1542                 cmd->data_direction     = DMA_NONE;
1543         }
1544
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(iscsit_setup_nop_out);
1548
1549 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1550                            struct iscsi_nopout *hdr)
1551 {
1552         struct iscsi_cmd *cmd_p = NULL;
1553         int cmdsn_ret = 0;
1554         /*
1555          * Initiator is expecting a NopIN ping reply..
1556          */
1557         if (hdr->itt != RESERVED_ITT) {
1558                 BUG_ON(!cmd);
1559
1560                 spin_lock_bh(&conn->cmd_lock);
1561                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1562                 spin_unlock_bh(&conn->cmd_lock);
1563
1564                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1565
1566                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1567                         iscsit_add_cmd_to_response_queue(cmd, conn,
1568                                                          cmd->i_state);
1569                         return 0;
1570                 }
1571
1572                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1573                                 (unsigned char *)hdr, hdr->cmdsn);
1574                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1575                         return 0;
1576                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1577                         return -1;
1578
1579                 return 0;
1580         }
1581         /*
1582          * This was a response to a unsolicited NOPIN ping.
1583          */
1584         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1585                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1586                 if (!cmd_p)
1587                         return -EINVAL;
1588
1589                 iscsit_stop_nopin_response_timer(conn);
1590
1591                 cmd_p->i_state = ISTATE_REMOVE;
1592                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1593
1594                 iscsit_start_nopin_timer(conn);
1595                 return 0;
1596         }
1597         /*
1598          * Otherwise, initiator is not expecting a NOPIN is response.
1599          * Just ignore for now.
1600          */
1601         return 0;
1602 }
1603 EXPORT_SYMBOL(iscsit_process_nop_out);
1604
1605 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1606                                  unsigned char *buf)
1607 {
1608         unsigned char *ping_data = NULL;
1609         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1610         struct kvec *iov = NULL;
1611         u32 payload_length = ntoh24(hdr->dlength);
1612         int ret;
1613
1614         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1615         if (ret < 0)
1616                 return 0;
1617         /*
1618          * Handle NOP-OUT payload for traditional iSCSI sockets
1619          */
1620         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1621                 u32 checksum, data_crc, padding = 0;
1622                 int niov = 0, rx_got, rx_size = payload_length;
1623
1624                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1625                 if (!ping_data) {
1626                         pr_err("Unable to allocate memory for"
1627                                 " NOPOUT ping data.\n");
1628                         ret = -1;
1629                         goto out;
1630                 }
1631
1632                 iov = &cmd->iov_misc[0];
1633                 iov[niov].iov_base      = ping_data;
1634                 iov[niov++].iov_len     = payload_length;
1635
1636                 padding = ((-payload_length) & 3);
1637                 if (padding != 0) {
1638                         pr_debug("Receiving %u additional bytes"
1639                                 " for padding.\n", padding);
1640                         iov[niov].iov_base      = &cmd->pad_bytes;
1641                         iov[niov++].iov_len     = padding;
1642                         rx_size += padding;
1643                 }
1644                 if (conn->conn_ops->DataDigest) {
1645                         iov[niov].iov_base      = &checksum;
1646                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1647                         rx_size += ISCSI_CRC_LEN;
1648                 }
1649
1650                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1651                 if (rx_got != rx_size) {
1652                         ret = -1;
1653                         goto out;
1654                 }
1655
1656                 if (conn->conn_ops->DataDigest) {
1657                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1658                                         ping_data, payload_length,
1659                                         padding, cmd->pad_bytes,
1660                                         (u8 *)&data_crc);
1661
1662                         if (checksum != data_crc) {
1663                                 pr_err("Ping data CRC32C DataDigest"
1664                                 " 0x%08x does not match computed 0x%08x\n",
1665                                         checksum, data_crc);
1666                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1667                                         pr_err("Unable to recover from"
1668                                         " NOPOUT Ping DataCRC failure while in"
1669                                                 " ERL=0.\n");
1670                                         ret = -1;
1671                                         goto out;
1672                                 } else {
1673                                         /*
1674                                          * Silently drop this PDU and let the
1675                                          * initiator plug the CmdSN gap.
1676                                          */
1677                                         pr_debug("Dropping NOPOUT"
1678                                         " Command CmdSN: 0x%08x due to"
1679                                         " DataCRC error.\n", hdr->cmdsn);
1680                                         ret = 0;
1681                                         goto out;
1682                                 }
1683                         } else {
1684                                 pr_debug("Got CRC32C DataDigest"
1685                                 " 0x%08x for %u bytes of ping data.\n",
1686                                         checksum, payload_length);
1687                         }
1688                 }
1689
1690                 ping_data[payload_length] = '\0';
1691                 /*
1692                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1693                  */
1694                 cmd->buf_ptr = ping_data;
1695                 cmd->buf_ptr_size = payload_length;
1696
1697                 pr_debug("Got %u bytes of NOPOUT ping"
1698                         " data.\n", payload_length);
1699                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1700         }
1701
1702         return iscsit_process_nop_out(conn, cmd, hdr);
1703 out:
1704         if (cmd)
1705                 iscsit_free_cmd(cmd, false);
1706
1707         kfree(ping_data);
1708         return ret;
1709 }
1710
1711 int
1712 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1713                            unsigned char *buf)
1714 {
1715         struct se_tmr_req *se_tmr;
1716         struct iscsi_tmr_req *tmr_req;
1717         struct iscsi_tm *hdr;
1718         int out_of_order_cmdsn = 0, ret;
1719         bool sess_ref = false;
1720         u8 function;
1721
1722         hdr                     = (struct iscsi_tm *) buf;
1723         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1724         function = hdr->flags;
1725
1726         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1727                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1728                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1729                 hdr->rtt, hdr->refcmdsn, conn->cid);
1730
1731         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1732             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1733              hdr->rtt != RESERVED_ITT)) {
1734                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1735                 hdr->rtt = RESERVED_ITT;
1736         }
1737
1738         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1739                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1740                 pr_err("Task Management Request TASK_REASSIGN not"
1741                         " issued as immediate command, bad iSCSI Initiator"
1742                                 "implementation\n");
1743                 return iscsit_add_reject_cmd(cmd,
1744                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1745         }
1746         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1747             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1748                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1749
1750         cmd->data_direction = DMA_NONE;
1751
1752         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1753         if (!cmd->tmr_req) {
1754                 pr_err("Unable to allocate memory for"
1755                         " Task Management command!\n");
1756                 return iscsit_add_reject_cmd(cmd,
1757                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1758                                              buf);
1759         }
1760
1761         /*
1762          * TASK_REASSIGN for ERL=2 / connection stays inside of
1763          * LIO-Target $FABRIC_MOD
1764          */
1765         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1766
1767                 u8 tcm_function;
1768                 int ret;
1769
1770                 transport_init_se_cmd(&cmd->se_cmd,
1771                                       &lio_target_fabric_configfs->tf_ops,
1772                                       conn->sess->se_sess, 0, DMA_NONE,
1773                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1774
1775                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1776                 sess_ref = true;
1777
1778                 switch (function) {
1779                 case ISCSI_TM_FUNC_ABORT_TASK:
1780                         tcm_function = TMR_ABORT_TASK;
1781                         break;
1782                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1783                         tcm_function = TMR_ABORT_TASK_SET;
1784                         break;
1785                 case ISCSI_TM_FUNC_CLEAR_ACA:
1786                         tcm_function = TMR_CLEAR_ACA;
1787                         break;
1788                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1789                         tcm_function = TMR_CLEAR_TASK_SET;
1790                         break;
1791                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1792                         tcm_function = TMR_LUN_RESET;
1793                         break;
1794                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1795                         tcm_function = TMR_TARGET_WARM_RESET;
1796                         break;
1797                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1798                         tcm_function = TMR_TARGET_COLD_RESET;
1799                         break;
1800                 default:
1801                         pr_err("Unknown iSCSI TMR Function:"
1802                                " 0x%02x\n", function);
1803                         return iscsit_add_reject_cmd(cmd,
1804                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1805                 }
1806
1807                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1808                                          tcm_function, GFP_KERNEL);
1809                 if (ret < 0)
1810                         return iscsit_add_reject_cmd(cmd,
1811                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1812
1813                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1814         }
1815
1816         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1817         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1818         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1819         cmd->init_task_tag      = hdr->itt;
1820         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1821         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1822         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1823         se_tmr                  = cmd->se_cmd.se_tmr_req;
1824         tmr_req                 = cmd->tmr_req;
1825         /*
1826          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1827          */
1828         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1829                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1830                                                scsilun_to_int(&hdr->lun));
1831                 if (ret < 0) {
1832                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1833                         goto attach;
1834                 }
1835         }
1836
1837         switch (function) {
1838         case ISCSI_TM_FUNC_ABORT_TASK:
1839                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1840                 if (se_tmr->response)
1841                         goto attach;
1842                 break;
1843         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1844         case ISCSI_TM_FUNC_CLEAR_ACA:
1845         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1846         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1847                 break;
1848         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1849                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1850                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1851                         goto attach;
1852                 }
1853                 break;
1854         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1855                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1856                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1857                         goto attach;
1858                 }
1859                 break;
1860         case ISCSI_TM_FUNC_TASK_REASSIGN:
1861                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1862                 /*
1863                  * Perform sanity checks on the ExpDataSN only if the
1864                  * TASK_REASSIGN was successful.
1865                  */
1866                 if (se_tmr->response)
1867                         break;
1868
1869                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1870                         return iscsit_add_reject_cmd(cmd,
1871                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1872                 break;
1873         default:
1874                 pr_err("Unknown TMR function: 0x%02x, protocol"
1875                         " error.\n", function);
1876                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1877                 goto attach;
1878         }
1879
1880         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1881             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1882                 se_tmr->call_transport = 1;
1883 attach:
1884         spin_lock_bh(&conn->cmd_lock);
1885         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1886         spin_unlock_bh(&conn->cmd_lock);
1887
1888         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1889                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1890                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1891                         out_of_order_cmdsn = 1;
1892                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1893                         return 0;
1894                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1895                         return -1;
1896         }
1897         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1898
1899         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1900                 return 0;
1901         /*
1902          * Found the referenced task, send to transport for processing.
1903          */
1904         if (se_tmr->call_transport)
1905                 return transport_generic_handle_tmr(&cmd->se_cmd);
1906
1907         /*
1908          * Could not find the referenced LUN, task, or Task Management
1909          * command not authorized or supported.  Change state and
1910          * let the tx_thread send the response.
1911          *
1912          * For connection recovery, this is also the default action for
1913          * TMR TASK_REASSIGN.
1914          */
1915         if (sess_ref) {
1916                 pr_debug("Handle TMR, using sess_ref=true check\n");
1917                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1918         }
1919
1920         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1921         return 0;
1922 }
1923 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1924
1925 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1926 int
1927 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1928                       struct iscsi_text *hdr)
1929 {
1930         u32 payload_length = ntoh24(hdr->dlength);
1931
1932         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1933                 pr_err("Unable to accept text parameter length: %u"
1934                         "greater than MaxXmitDataSegmentLength %u.\n",
1935                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1936                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1937                                          (unsigned char *)hdr);
1938         }
1939
1940         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1941              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1942                 pr_err("Multi sequence text commands currently not supported\n");
1943                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1944                                         (unsigned char *)hdr);
1945         }
1946
1947         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1948                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1949                 hdr->exp_statsn, payload_length);
1950
1951         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1952         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1953         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1954         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1955         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1956         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1957         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1958         cmd->data_direction     = DMA_NONE;
1959
1960         return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1963
1964 int
1965 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1966                         struct iscsi_text *hdr)
1967 {
1968         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1969         int cmdsn_ret;
1970
1971         if (!text_in) {
1972                 pr_err("Unable to locate text_in buffer for sendtargets"
1973                        " discovery\n");
1974                 goto reject;
1975         }
1976         if (strncmp("SendTargets", text_in, 11) != 0) {
1977                 pr_err("Received Text Data that is not"
1978                         " SendTargets, cannot continue.\n");
1979                 goto reject;
1980         }
1981         text_ptr = strchr(text_in, '=');
1982         if (!text_ptr) {
1983                 pr_err("No \"=\" separator found in Text Data,"
1984                         "  cannot continue.\n");
1985                 goto reject;
1986         }
1987         if (!strncmp("=All", text_ptr, 4)) {
1988                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
1989         } else if (!strncmp("=iqn.", text_ptr, 5) ||
1990                    !strncmp("=eui.", text_ptr, 5)) {
1991                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
1992         } else {
1993                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
1994                 goto reject;
1995         }
1996
1997         spin_lock_bh(&conn->cmd_lock);
1998         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1999         spin_unlock_bh(&conn->cmd_lock);
2000
2001         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2002
2003         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2004                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2005                                 (unsigned char *)hdr, hdr->cmdsn);
2006                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2007                         return -1;
2008
2009                 return 0;
2010         }
2011
2012         return iscsit_execute_cmd(cmd, 0);
2013
2014 reject:
2015         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2016                                  (unsigned char *)hdr);
2017 }
2018 EXPORT_SYMBOL(iscsit_process_text_cmd);
2019
2020 static int
2021 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2022                        unsigned char *buf)
2023 {
2024         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2025         char *text_in = NULL;
2026         u32 payload_length = ntoh24(hdr->dlength);
2027         int rx_size, rc;
2028
2029         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2030         if (rc < 0)
2031                 return 0;
2032
2033         rx_size = payload_length;
2034         if (payload_length) {
2035                 u32 checksum = 0, data_crc = 0;
2036                 u32 padding = 0, pad_bytes = 0;
2037                 int niov = 0, rx_got;
2038                 struct kvec iov[3];
2039
2040                 text_in = kzalloc(payload_length, GFP_KERNEL);
2041                 if (!text_in) {
2042                         pr_err("Unable to allocate memory for"
2043                                 " incoming text parameters\n");
2044                         goto reject;
2045                 }
2046                 cmd->text_in_ptr = text_in;
2047
2048                 memset(iov, 0, 3 * sizeof(struct kvec));
2049                 iov[niov].iov_base      = text_in;
2050                 iov[niov++].iov_len     = payload_length;
2051
2052                 padding = ((-payload_length) & 3);
2053                 if (padding != 0) {
2054                         iov[niov].iov_base = &pad_bytes;
2055                         iov[niov++].iov_len  = padding;
2056                         rx_size += padding;
2057                         pr_debug("Receiving %u additional bytes"
2058                                         " for padding.\n", padding);
2059                 }
2060                 if (conn->conn_ops->DataDigest) {
2061                         iov[niov].iov_base      = &checksum;
2062                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2063                         rx_size += ISCSI_CRC_LEN;
2064                 }
2065
2066                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2067                 if (rx_got != rx_size)
2068                         goto reject;
2069
2070                 if (conn->conn_ops->DataDigest) {
2071                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2072                                         text_in, payload_length,
2073                                         padding, (u8 *)&pad_bytes,
2074                                         (u8 *)&data_crc);
2075
2076                         if (checksum != data_crc) {
2077                                 pr_err("Text data CRC32C DataDigest"
2078                                         " 0x%08x does not match computed"
2079                                         " 0x%08x\n", checksum, data_crc);
2080                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2081                                         pr_err("Unable to recover from"
2082                                         " Text Data digest failure while in"
2083                                                 " ERL=0.\n");
2084                                         goto reject;
2085                                 } else {
2086                                         /*
2087                                          * Silently drop this PDU and let the
2088                                          * initiator plug the CmdSN gap.
2089                                          */
2090                                         pr_debug("Dropping Text"
2091                                         " Command CmdSN: 0x%08x due to"
2092                                         " DataCRC error.\n", hdr->cmdsn);
2093                                         kfree(text_in);
2094                                         return 0;
2095                                 }
2096                         } else {
2097                                 pr_debug("Got CRC32C DataDigest"
2098                                         " 0x%08x for %u bytes of text data.\n",
2099                                                 checksum, payload_length);
2100                         }
2101                 }
2102                 text_in[payload_length - 1] = '\0';
2103                 pr_debug("Successfully read %d bytes of text"
2104                                 " data.\n", payload_length);
2105         }
2106
2107         return iscsit_process_text_cmd(conn, cmd, hdr);
2108
2109 reject:
2110         kfree(cmd->text_in_ptr);
2111         cmd->text_in_ptr = NULL;
2112         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2113 }
2114 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2115
2116 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2117 {
2118         struct iscsi_conn *conn_p;
2119         struct iscsi_session *sess = conn->sess;
2120
2121         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2122                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2123
2124         atomic_set(&sess->session_logout, 1);
2125         atomic_set(&conn->conn_logout_remove, 1);
2126         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2127
2128         iscsit_inc_conn_usage_count(conn);
2129         iscsit_inc_session_usage_count(sess);
2130
2131         spin_lock_bh(&sess->conn_lock);
2132         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2133                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2134                         continue;
2135
2136                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2137                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2138         }
2139         spin_unlock_bh(&sess->conn_lock);
2140
2141         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2142
2143         return 0;
2144 }
2145
2146 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2147 {
2148         struct iscsi_conn *l_conn;
2149         struct iscsi_session *sess = conn->sess;
2150
2151         pr_debug("Received logout request CLOSECONNECTION for CID:"
2152                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2153
2154         /*
2155          * A Logout Request with a CLOSECONNECTION reason code for a CID
2156          * can arrive on a connection with a differing CID.
2157          */
2158         if (conn->cid == cmd->logout_cid) {
2159                 spin_lock_bh(&conn->state_lock);
2160                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2161                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2162
2163                 atomic_set(&conn->conn_logout_remove, 1);
2164                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2165                 iscsit_inc_conn_usage_count(conn);
2166
2167                 spin_unlock_bh(&conn->state_lock);
2168         } else {
2169                 /*
2170                  * Handle all different cid CLOSECONNECTION requests in
2171                  * iscsit_logout_post_handler_diffcid() as to give enough
2172                  * time for any non immediate command's CmdSN to be
2173                  * acknowledged on the connection in question.
2174                  *
2175                  * Here we simply make sure the CID is still around.
2176                  */
2177                 l_conn = iscsit_get_conn_from_cid(sess,
2178                                 cmd->logout_cid);
2179                 if (!l_conn) {
2180                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2181                         iscsit_add_cmd_to_response_queue(cmd, conn,
2182                                         cmd->i_state);
2183                         return 0;
2184                 }
2185
2186                 iscsit_dec_conn_usage_count(l_conn);
2187         }
2188
2189         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2190
2191         return 0;
2192 }
2193
2194 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2195 {
2196         struct iscsi_session *sess = conn->sess;
2197
2198         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2199                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2200
2201         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2202                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2203                         " while ERL!=2.\n");
2204                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2205                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2206                 return 0;
2207         }
2208
2209         if (conn->cid == cmd->logout_cid) {
2210                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2211                         " with CID: %hu on CID: %hu, implementation error.\n",
2212                                 cmd->logout_cid, conn->cid);
2213                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2214                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2215                 return 0;
2216         }
2217
2218         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2219
2220         return 0;
2221 }
2222
2223 int
2224 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2225                         unsigned char *buf)
2226 {
2227         int cmdsn_ret, logout_remove = 0;
2228         u8 reason_code = 0;
2229         struct iscsi_logout *hdr;
2230         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2231
2232         hdr                     = (struct iscsi_logout *) buf;
2233         reason_code             = (hdr->flags & 0x7f);
2234
2235         if (tiqn) {
2236                 spin_lock(&tiqn->logout_stats.lock);
2237                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2238                         tiqn->logout_stats.normal_logouts++;
2239                 else
2240                         tiqn->logout_stats.abnormal_logouts++;
2241                 spin_unlock(&tiqn->logout_stats.lock);
2242         }
2243
2244         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2245                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2246                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2247                 hdr->cid, conn->cid);
2248
2249         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2250                 pr_err("Received logout request on connection that"
2251                         " is not in logged in state, ignoring request.\n");
2252                 iscsit_free_cmd(cmd, false);
2253                 return 0;
2254         }
2255
2256         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2257         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2258         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2259         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2260         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2261         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2262         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2263         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2264         cmd->logout_reason      = reason_code;
2265         cmd->data_direction     = DMA_NONE;
2266
2267         /*
2268          * We need to sleep in these cases (by returning 1) until the Logout
2269          * Response gets sent in the tx thread.
2270          */
2271         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2272            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2273             be16_to_cpu(hdr->cid) == conn->cid))
2274                 logout_remove = 1;
2275
2276         spin_lock_bh(&conn->cmd_lock);
2277         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2278         spin_unlock_bh(&conn->cmd_lock);
2279
2280         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2281                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2282
2283         /*
2284          * Immediate commands are executed, well, immediately.
2285          * Non-Immediate Logout Commands are executed in CmdSN order.
2286          */
2287         if (cmd->immediate_cmd) {
2288                 int ret = iscsit_execute_cmd(cmd, 0);
2289
2290                 if (ret < 0)
2291                         return ret;
2292         } else {
2293                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2294                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2295                         logout_remove = 0;
2296                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2297                         return -1;
2298         }
2299
2300         return logout_remove;
2301 }
2302 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2303
2304 static int iscsit_handle_snack(
2305         struct iscsi_conn *conn,
2306         unsigned char *buf)
2307 {
2308         struct iscsi_snack *hdr;
2309
2310         hdr                     = (struct iscsi_snack *) buf;
2311         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2312
2313         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2314                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2315                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2316                         hdr->begrun, hdr->runlength, conn->cid);
2317
2318         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2319                 pr_err("Initiator sent SNACK request while in"
2320                         " ErrorRecoveryLevel=0.\n");
2321                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2322                                          buf);
2323         }
2324         /*
2325          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2326          * call from inside iscsi_send_recovery_datain_or_r2t().
2327          */
2328         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2329         case 0:
2330                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2331                         hdr->itt,
2332                         be32_to_cpu(hdr->ttt),
2333                         be32_to_cpu(hdr->begrun),
2334                         be32_to_cpu(hdr->runlength));
2335         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2336                 return iscsit_handle_status_snack(conn, hdr->itt,
2337                         be32_to_cpu(hdr->ttt),
2338                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2339         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2340                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2341                         be32_to_cpu(hdr->begrun),
2342                         be32_to_cpu(hdr->runlength));
2343         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2344                 /* FIXME: Support R-Data SNACK */
2345                 pr_err("R-Data SNACK Not Supported.\n");
2346                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2347                                          buf);
2348         default:
2349                 pr_err("Unknown SNACK type 0x%02x, protocol"
2350                         " error.\n", hdr->flags & 0x0f);
2351                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2352                                          buf);
2353         }
2354
2355         return 0;
2356 }
2357
2358 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2359 {
2360         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2361             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2362                 wait_for_completion_interruptible_timeout(
2363                                         &conn->rx_half_close_comp,
2364                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2365         }
2366 }
2367
2368 static int iscsit_handle_immediate_data(
2369         struct iscsi_cmd *cmd,
2370         struct iscsi_scsi_req *hdr,
2371         u32 length)
2372 {
2373         int iov_ret, rx_got = 0, rx_size = 0;
2374         u32 checksum, iov_count = 0, padding = 0;
2375         struct iscsi_conn *conn = cmd->conn;
2376         struct kvec *iov;
2377
2378         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2379         if (iov_ret < 0)
2380                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2381
2382         rx_size = length;
2383         iov_count = iov_ret;
2384         iov = &cmd->iov_data[0];
2385
2386         padding = ((-length) & 3);
2387         if (padding != 0) {
2388                 iov[iov_count].iov_base = cmd->pad_bytes;
2389                 iov[iov_count++].iov_len = padding;
2390                 rx_size += padding;
2391         }
2392
2393         if (conn->conn_ops->DataDigest) {
2394                 iov[iov_count].iov_base         = &checksum;
2395                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2396                 rx_size += ISCSI_CRC_LEN;
2397         }
2398
2399         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2400
2401         iscsit_unmap_iovec(cmd);
2402
2403         if (rx_got != rx_size) {
2404                 iscsit_rx_thread_wait_for_tcp(conn);
2405                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2406         }
2407
2408         if (conn->conn_ops->DataDigest) {
2409                 u32 data_crc;
2410
2411                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2412                                                     cmd->write_data_done, length, padding,
2413                                                     cmd->pad_bytes);
2414
2415                 if (checksum != data_crc) {
2416                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2417                                 " does not match computed 0x%08x\n", checksum,
2418                                 data_crc);
2419
2420                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2421                                 pr_err("Unable to recover from"
2422                                         " Immediate Data digest failure while"
2423                                         " in ERL=0.\n");
2424                                 iscsit_reject_cmd(cmd,
2425                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2426                                                 (unsigned char *)hdr);
2427                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2428                         } else {
2429                                 iscsit_reject_cmd(cmd,
2430                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2431                                                 (unsigned char *)hdr);
2432                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2433                         }
2434                 } else {
2435                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2436                                 " %u bytes of Immediate Data\n", checksum,
2437                                 length);
2438                 }
2439         }
2440
2441         cmd->write_data_done += length;
2442
2443         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2444                 spin_lock_bh(&cmd->istate_lock);
2445                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2446                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2447                 spin_unlock_bh(&cmd->istate_lock);
2448         }
2449
2450         return IMMEDIATE_DATA_NORMAL_OPERATION;
2451 }
2452
2453 /*
2454  *      Called with sess->conn_lock held.
2455  */
2456 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2457         with active network interface */
2458 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2459 {
2460         struct iscsi_cmd *cmd;
2461         struct iscsi_conn *conn_p;
2462
2463         /*
2464          * Only send a Asynchronous Message on connections whos network
2465          * interface is still functional.
2466          */
2467         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2468                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2469                         iscsit_inc_conn_usage_count(conn_p);
2470                         break;
2471                 }
2472         }
2473
2474         if (!conn_p)
2475                 return;
2476
2477         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2478         if (!cmd) {
2479                 iscsit_dec_conn_usage_count(conn_p);
2480                 return;
2481         }
2482
2483         cmd->logout_cid = conn->cid;
2484         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2485         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2486
2487         spin_lock_bh(&conn_p->cmd_lock);
2488         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2489         spin_unlock_bh(&conn_p->cmd_lock);
2490
2491         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2492         iscsit_dec_conn_usage_count(conn_p);
2493 }
2494
2495 static int iscsit_send_conn_drop_async_message(
2496         struct iscsi_cmd *cmd,
2497         struct iscsi_conn *conn)
2498 {
2499         struct iscsi_async *hdr;
2500
2501         cmd->tx_size = ISCSI_HDR_LEN;
2502         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2503
2504         hdr                     = (struct iscsi_async *) cmd->pdu;
2505         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2506         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2507         cmd->init_task_tag      = RESERVED_ITT;
2508         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2509         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2510         cmd->stat_sn            = conn->stat_sn++;
2511         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2512         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2513         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2514         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2515         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2516         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2517         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2518
2519         if (conn->conn_ops->HeaderDigest) {
2520                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2521
2522                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2523                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2524
2525                 cmd->tx_size += ISCSI_CRC_LEN;
2526                 pr_debug("Attaching CRC32C HeaderDigest to"
2527                         " Async Message 0x%08x\n", *header_digest);
2528         }
2529
2530         cmd->iov_misc[0].iov_base       = cmd->pdu;
2531         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2532         cmd->iov_misc_count             = 1;
2533
2534         pr_debug("Sending Connection Dropped Async Message StatSN:"
2535                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2536                         cmd->logout_cid, conn->cid);
2537         return 0;
2538 }
2539
2540 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2541 {
2542         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2543             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2544                 wait_for_completion_interruptible_timeout(
2545                                         &conn->tx_half_close_comp,
2546                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2547         }
2548 }
2549
2550 static void
2551 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2552                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2553                         bool set_statsn)
2554 {
2555         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2556         hdr->flags              = datain->flags;
2557         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2558                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2559                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2560                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2561                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2562                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2563                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2564                 }
2565         }
2566         hton24(hdr->dlength, datain->length);
2567         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2568                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2569                                 (struct scsi_lun *)&hdr->lun);
2570         else
2571                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2572
2573         hdr->itt                = cmd->init_task_tag;
2574
2575         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2576                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2577         else
2578                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2579         if (set_statsn)
2580                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2581         else
2582                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2583
2584         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2585         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2586         hdr->datasn             = cpu_to_be32(datain->data_sn);
2587         hdr->offset             = cpu_to_be32(datain->offset);
2588
2589         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2590                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2591                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2592                 ntohl(hdr->offset), datain->length, conn->cid);
2593 }
2594
2595 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2596 {
2597         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2598         struct iscsi_datain datain;
2599         struct iscsi_datain_req *dr;
2600         struct kvec *iov;
2601         u32 iov_count = 0, tx_size = 0;
2602         int eodr = 0, ret, iov_ret;
2603         bool set_statsn = false;
2604
2605         memset(&datain, 0, sizeof(struct iscsi_datain));
2606         dr = iscsit_get_datain_values(cmd, &datain);
2607         if (!dr) {
2608                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2609                                 cmd->init_task_tag);
2610                 return -1;
2611         }
2612         /*
2613          * Be paranoid and double check the logic for now.
2614          */
2615         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2616                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2617                         " datain.length: %u exceeds cmd->data_length: %u\n",
2618                         cmd->init_task_tag, datain.offset, datain.length,
2619                         cmd->se_cmd.data_length);
2620                 return -1;
2621         }
2622
2623         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2624         /*
2625          * Special case for successfully execution w/ both DATAIN
2626          * and Sense Data.
2627          */
2628         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2629             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2630                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2631         else {
2632                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2633                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2634                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2635                         cmd->stat_sn = conn->stat_sn++;
2636                         set_statsn = true;
2637                 } else if (dr->dr_complete ==
2638                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2639                         set_statsn = true;
2640         }
2641
2642         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2643
2644         iov = &cmd->iov_data[0];
2645         iov[iov_count].iov_base = cmd->pdu;
2646         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2647         tx_size += ISCSI_HDR_LEN;
2648
2649         if (conn->conn_ops->HeaderDigest) {
2650                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2651
2652                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2653                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2654
2655                 iov[0].iov_len += ISCSI_CRC_LEN;
2656                 tx_size += ISCSI_CRC_LEN;
2657
2658                 pr_debug("Attaching CRC32 HeaderDigest"
2659                         " for DataIN PDU 0x%08x\n", *header_digest);
2660         }
2661
2662         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2663                                 datain.offset, datain.length);
2664         if (iov_ret < 0)
2665                 return -1;
2666
2667         iov_count += iov_ret;
2668         tx_size += datain.length;
2669
2670         cmd->padding = ((-datain.length) & 3);
2671         if (cmd->padding) {
2672                 iov[iov_count].iov_base         = cmd->pad_bytes;
2673                 iov[iov_count++].iov_len        = cmd->padding;
2674                 tx_size += cmd->padding;
2675
2676                 pr_debug("Attaching %u padding bytes\n",
2677                                 cmd->padding);
2678         }
2679         if (conn->conn_ops->DataDigest) {
2680                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2681                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2682
2683                 iov[iov_count].iov_base = &cmd->data_crc;
2684                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2685                 tx_size += ISCSI_CRC_LEN;
2686
2687                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2688                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2689         }
2690
2691         cmd->iov_data_count = iov_count;
2692         cmd->tx_size = tx_size;
2693
2694         /* sendpage is preferred but can't insert markers */
2695         if (!conn->conn_ops->IFMarker)
2696                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2697         else
2698                 ret = iscsit_send_tx_data(cmd, conn, 0);
2699
2700         iscsit_unmap_iovec(cmd);
2701
2702         if (ret < 0) {
2703                 iscsit_tx_thread_wait_for_tcp(conn);
2704                 return ret;
2705         }
2706
2707         if (dr->dr_complete) {
2708                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2709                                 2 : 1;
2710                 iscsit_free_datain_req(cmd, dr);
2711         }
2712
2713         return eodr;
2714 }
2715
2716 int
2717 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2718                         struct iscsi_logout_rsp *hdr)
2719 {
2720         struct iscsi_conn *logout_conn = NULL;
2721         struct iscsi_conn_recovery *cr = NULL;
2722         struct iscsi_session *sess = conn->sess;
2723         /*
2724          * The actual shutting down of Sessions and/or Connections
2725          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2726          * is done in scsi_logout_post_handler().
2727          */
2728         switch (cmd->logout_reason) {
2729         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2730                 pr_debug("iSCSI session logout successful, setting"
2731                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2732                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2733                 break;
2734         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2735                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2736                         break;
2737                 /*
2738                  * For CLOSECONNECTION logout requests carrying
2739                  * a matching logout CID -> local CID, the reference
2740                  * for the local CID will have been incremented in
2741                  * iscsi_logout_closeconnection().
2742                  *
2743                  * For CLOSECONNECTION logout requests carrying
2744                  * a different CID than the connection it arrived
2745                  * on, the connection responding to cmd->logout_cid
2746                  * is stopped in iscsit_logout_post_handler_diffcid().
2747                  */
2748
2749                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2750                         " successful.\n", cmd->logout_cid, conn->cid);
2751                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2752                 break;
2753         case ISCSI_LOGOUT_REASON_RECOVERY:
2754                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2755                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2756                         break;
2757                 /*
2758                  * If the connection is still active from our point of view
2759                  * force connection recovery to occur.
2760                  */
2761                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2762                                 cmd->logout_cid);
2763                 if (logout_conn) {
2764                         iscsit_connection_reinstatement_rcfr(logout_conn);
2765                         iscsit_dec_conn_usage_count(logout_conn);
2766                 }
2767
2768                 cr = iscsit_get_inactive_connection_recovery_entry(
2769                                 conn->sess, cmd->logout_cid);
2770                 if (!cr) {
2771                         pr_err("Unable to locate CID: %hu for"
2772                         " REMOVECONNFORRECOVERY Logout Request.\n",
2773                                 cmd->logout_cid);
2774                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2775                         break;
2776                 }
2777
2778                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2779
2780                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2781                         " for recovery for CID: %hu on CID: %hu successful.\n",
2782                                 cmd->logout_cid, conn->cid);
2783                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2784                 break;
2785         default:
2786                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2787                                 cmd->logout_reason);
2788                 return -1;
2789         }
2790
2791         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2792         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2793         hdr->response           = cmd->logout_response;
2794         hdr->itt                = cmd->init_task_tag;
2795         cmd->stat_sn            = conn->stat_sn++;
2796         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2797
2798         iscsit_increment_maxcmdsn(cmd, conn->sess);
2799         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2800         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2801
2802         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2803                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2804                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2805                 cmd->logout_cid, conn->cid);
2806
2807         return 0;
2808 }
2809 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2810
2811 static int
2812 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2813 {
2814         struct kvec *iov;
2815         int niov = 0, tx_size, rc;
2816
2817         rc = iscsit_build_logout_rsp(cmd, conn,
2818                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2819         if (rc < 0)
2820                 return rc;
2821
2822         tx_size = ISCSI_HDR_LEN;
2823         iov = &cmd->iov_misc[0];
2824         iov[niov].iov_base      = cmd->pdu;
2825         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2826
2827         if (conn->conn_ops->HeaderDigest) {
2828                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2829
2830                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2831                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2832
2833                 iov[0].iov_len += ISCSI_CRC_LEN;
2834                 tx_size += ISCSI_CRC_LEN;
2835                 pr_debug("Attaching CRC32C HeaderDigest to"
2836                         " Logout Response 0x%08x\n", *header_digest);
2837         }
2838         cmd->iov_misc_count = niov;
2839         cmd->tx_size = tx_size;
2840
2841         return 0;
2842 }
2843
2844 void
2845 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2846                        struct iscsi_nopin *hdr, bool nopout_response)
2847 {
2848         hdr->opcode             = ISCSI_OP_NOOP_IN;
2849         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2850         hton24(hdr->dlength, cmd->buf_ptr_size);
2851         if (nopout_response)
2852                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2853         hdr->itt                = cmd->init_task_tag;
2854         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2855         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2856                                   conn->stat_sn;
2857         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2858
2859         if (nopout_response)
2860                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2861
2862         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2863         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2864
2865         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2866                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2867                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2868                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2869 }
2870 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2871
2872 /*
2873  *      Unsolicited NOPIN, either requesting a response or not.
2874  */
2875 static int iscsit_send_unsolicited_nopin(
2876         struct iscsi_cmd *cmd,
2877         struct iscsi_conn *conn,
2878         int want_response)
2879 {
2880         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2881         int tx_size = ISCSI_HDR_LEN, ret;
2882
2883         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2884
2885         if (conn->conn_ops->HeaderDigest) {
2886                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2887
2888                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2889                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2890
2891                 tx_size += ISCSI_CRC_LEN;
2892                 pr_debug("Attaching CRC32C HeaderDigest to"
2893                         " NopIN 0x%08x\n", *header_digest);
2894         }
2895
2896         cmd->iov_misc[0].iov_base       = cmd->pdu;
2897         cmd->iov_misc[0].iov_len        = tx_size;
2898         cmd->iov_misc_count     = 1;
2899         cmd->tx_size            = tx_size;
2900
2901         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2902                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2903
2904         ret = iscsit_send_tx_data(cmd, conn, 1);
2905         if (ret < 0) {
2906                 iscsit_tx_thread_wait_for_tcp(conn);
2907                 return ret;
2908         }
2909
2910         spin_lock_bh(&cmd->istate_lock);
2911         cmd->i_state = want_response ?
2912                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2913         spin_unlock_bh(&cmd->istate_lock);
2914
2915         return 0;
2916 }
2917
2918 static int
2919 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2920 {
2921         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2922         struct kvec *iov;
2923         u32 padding = 0;
2924         int niov = 0, tx_size;
2925
2926         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2927
2928         tx_size = ISCSI_HDR_LEN;
2929         iov = &cmd->iov_misc[0];
2930         iov[niov].iov_base      = cmd->pdu;
2931         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2932
2933         if (conn->conn_ops->HeaderDigest) {
2934                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2935
2936                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2937                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2938
2939                 iov[0].iov_len += ISCSI_CRC_LEN;
2940                 tx_size += ISCSI_CRC_LEN;
2941                 pr_debug("Attaching CRC32C HeaderDigest"
2942                         " to NopIn 0x%08x\n", *header_digest);
2943         }
2944
2945         /*
2946          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2947          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2948          */
2949         if (cmd->buf_ptr_size) {
2950                 iov[niov].iov_base      = cmd->buf_ptr;
2951                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2952                 tx_size += cmd->buf_ptr_size;
2953
2954                 pr_debug("Echoing back %u bytes of ping"
2955                         " data.\n", cmd->buf_ptr_size);
2956
2957                 padding = ((-cmd->buf_ptr_size) & 3);
2958                 if (padding != 0) {
2959                         iov[niov].iov_base = &cmd->pad_bytes;
2960                         iov[niov++].iov_len = padding;
2961                         tx_size += padding;
2962                         pr_debug("Attaching %u additional"
2963                                 " padding bytes.\n", padding);
2964                 }
2965                 if (conn->conn_ops->DataDigest) {
2966                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2967                                 cmd->buf_ptr, cmd->buf_ptr_size,
2968                                 padding, (u8 *)&cmd->pad_bytes,
2969                                 (u8 *)&cmd->data_crc);
2970
2971                         iov[niov].iov_base = &cmd->data_crc;
2972                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2973                         tx_size += ISCSI_CRC_LEN;
2974                         pr_debug("Attached DataDigest for %u"
2975                                 " bytes of ping data, CRC 0x%08x\n",
2976                                 cmd->buf_ptr_size, cmd->data_crc);
2977                 }
2978         }
2979
2980         cmd->iov_misc_count = niov;
2981         cmd->tx_size = tx_size;
2982
2983         return 0;
2984 }
2985
2986 static int iscsit_send_r2t(
2987         struct iscsi_cmd *cmd,
2988         struct iscsi_conn *conn)
2989 {
2990         int tx_size = 0;
2991         struct iscsi_r2t *r2t;
2992         struct iscsi_r2t_rsp *hdr;
2993         int ret;
2994
2995         r2t = iscsit_get_r2t_from_list(cmd);
2996         if (!r2t)
2997                 return -1;
2998
2999         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3000         memset(hdr, 0, ISCSI_HDR_LEN);
3001         hdr->opcode             = ISCSI_OP_R2T;
3002         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3003         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3004                         (struct scsi_lun *)&hdr->lun);
3005         hdr->itt                = cmd->init_task_tag;
3006         spin_lock_bh(&conn->sess->ttt_lock);
3007         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3008         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3009                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3010         spin_unlock_bh(&conn->sess->ttt_lock);
3011         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3012         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3013         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3014         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3015         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3016         hdr->data_offset        = cpu_to_be32(r2t->offset);
3017         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3018
3019         cmd->iov_misc[0].iov_base       = cmd->pdu;
3020         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3021         tx_size += ISCSI_HDR_LEN;
3022
3023         if (conn->conn_ops->HeaderDigest) {
3024                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3025
3026                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3027                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3028
3029                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3030                 tx_size += ISCSI_CRC_LEN;
3031                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3032                         " PDU 0x%08x\n", *header_digest);
3033         }
3034
3035         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3036                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3037                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3038                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3039                         r2t->offset, r2t->xfer_len, conn->cid);
3040
3041         cmd->iov_misc_count = 1;
3042         cmd->tx_size = tx_size;
3043
3044         spin_lock_bh(&cmd->r2t_lock);
3045         r2t->sent_r2t = 1;
3046         spin_unlock_bh(&cmd->r2t_lock);
3047
3048         ret = iscsit_send_tx_data(cmd, conn, 1);
3049         if (ret < 0) {
3050                 iscsit_tx_thread_wait_for_tcp(conn);
3051                 return ret;
3052         }
3053
3054         spin_lock_bh(&cmd->dataout_timeout_lock);
3055         iscsit_start_dataout_timer(cmd, conn);
3056         spin_unlock_bh(&cmd->dataout_timeout_lock);
3057
3058         return 0;
3059 }
3060
3061 /*
3062  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3063  *              connection recovery.
3064  */
3065 int iscsit_build_r2ts_for_cmd(
3066         struct iscsi_conn *conn,
3067         struct iscsi_cmd *cmd,
3068         bool recovery)
3069 {
3070         int first_r2t = 1;
3071         u32 offset = 0, xfer_len = 0;
3072
3073         spin_lock_bh(&cmd->r2t_lock);
3074         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3075                 spin_unlock_bh(&cmd->r2t_lock);
3076                 return 0;
3077         }
3078
3079         if (conn->sess->sess_ops->DataSequenceInOrder &&
3080             !recovery)
3081                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3082
3083         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3084                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3085                         offset = cmd->r2t_offset;
3086
3087                         if (first_r2t && recovery) {
3088                                 int new_data_end = offset +
3089                                         conn->sess->sess_ops->MaxBurstLength -
3090                                         cmd->next_burst_len;
3091
3092                                 if (new_data_end > cmd->se_cmd.data_length)
3093                                         xfer_len = cmd->se_cmd.data_length - offset;
3094                                 else
3095                                         xfer_len =
3096                                                 conn->sess->sess_ops->MaxBurstLength -
3097                                                 cmd->next_burst_len;
3098                         } else {
3099                                 int new_data_end = offset +
3100                                         conn->sess->sess_ops->MaxBurstLength;
3101
3102                                 if (new_data_end > cmd->se_cmd.data_length)
3103                                         xfer_len = cmd->se_cmd.data_length - offset;
3104                                 else
3105                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3106                         }
3107                         cmd->r2t_offset += xfer_len;
3108
3109                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3110                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3111                 } else {
3112                         struct iscsi_seq *seq;
3113
3114                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3115                         if (!seq) {
3116                                 spin_unlock_bh(&cmd->r2t_lock);
3117                                 return -1;
3118                         }
3119
3120                         offset = seq->offset;
3121                         xfer_len = seq->xfer_len;
3122
3123                         if (cmd->seq_send_order == cmd->seq_count)
3124                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3125                 }
3126                 cmd->outstanding_r2ts++;
3127                 first_r2t = 0;
3128
3129                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3130                         spin_unlock_bh(&cmd->r2t_lock);
3131                         return -1;
3132                 }
3133
3134                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3135                         break;
3136         }
3137         spin_unlock_bh(&cmd->r2t_lock);
3138
3139         return 0;
3140 }
3141
3142 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3143                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3144 {
3145         if (inc_stat_sn)
3146                 cmd->stat_sn = conn->stat_sn++;
3147
3148         atomic_long_inc(&conn->sess->rsp_pdus);
3149
3150         memset(hdr, 0, ISCSI_HDR_LEN);
3151         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3152         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3153         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3154                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3155                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3156         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3157                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3158                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3159         }
3160         hdr->response           = cmd->iscsi_response;
3161         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3162         hdr->itt                = cmd->init_task_tag;
3163         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3164
3165         iscsit_increment_maxcmdsn(cmd, conn->sess);
3166         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3167         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3168
3169         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3170                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3171                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3172                 cmd->se_cmd.scsi_status, conn->cid);
3173 }
3174 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3175
3176 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3177 {
3178         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3179         struct kvec *iov;
3180         u32 padding = 0, tx_size = 0;
3181         int iov_count = 0;
3182         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3183
3184         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3185
3186         iov = &cmd->iov_misc[0];
3187         iov[iov_count].iov_base = cmd->pdu;
3188         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3189         tx_size += ISCSI_HDR_LEN;
3190
3191         /*
3192          * Attach SENSE DATA payload to iSCSI Response PDU
3193          */
3194         if (cmd->se_cmd.sense_buffer &&
3195            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3196             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3197                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3198                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3199
3200                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3201                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3202                 iov[iov_count].iov_base = cmd->sense_buffer;
3203                 iov[iov_count++].iov_len =
3204                                 (cmd->se_cmd.scsi_sense_length + padding);
3205                 tx_size += cmd->se_cmd.scsi_sense_length;
3206
3207                 if (padding) {
3208                         memset(cmd->sense_buffer +
3209                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3210                         tx_size += padding;
3211                         pr_debug("Adding %u bytes of padding to"
3212                                 " SENSE.\n", padding);
3213                 }
3214
3215                 if (conn->conn_ops->DataDigest) {
3216                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3217                                 cmd->sense_buffer,
3218                                 (cmd->se_cmd.scsi_sense_length + padding),
3219                                 0, NULL, (u8 *)&cmd->data_crc);
3220
3221                         iov[iov_count].iov_base    = &cmd->data_crc;
3222                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3223                         tx_size += ISCSI_CRC_LEN;
3224
3225                         pr_debug("Attaching CRC32 DataDigest for"
3226                                 " SENSE, %u bytes CRC 0x%08x\n",
3227                                 (cmd->se_cmd.scsi_sense_length + padding),
3228                                 cmd->data_crc);
3229                 }
3230
3231                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3232                                 " Response PDU\n",
3233                                 cmd->se_cmd.scsi_sense_length);
3234         }
3235
3236         if (conn->conn_ops->HeaderDigest) {
3237                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3238
3239                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3240                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3241
3242                 iov[0].iov_len += ISCSI_CRC_LEN;
3243                 tx_size += ISCSI_CRC_LEN;
3244                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3245                                 " PDU 0x%08x\n", *header_digest);
3246         }
3247
3248         cmd->iov_misc_count = iov_count;
3249         cmd->tx_size = tx_size;
3250
3251         return 0;
3252 }
3253
3254 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3255 {
3256         switch (se_tmr->response) {
3257         case TMR_FUNCTION_COMPLETE:
3258                 return ISCSI_TMF_RSP_COMPLETE;
3259         case TMR_TASK_DOES_NOT_EXIST:
3260                 return ISCSI_TMF_RSP_NO_TASK;
3261         case TMR_LUN_DOES_NOT_EXIST:
3262                 return ISCSI_TMF_RSP_NO_LUN;
3263         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3264                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3265         case TMR_FUNCTION_REJECTED:
3266         default:
3267                 return ISCSI_TMF_RSP_REJECTED;
3268         }
3269 }
3270
3271 void
3272 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3273                           struct iscsi_tm_rsp *hdr)
3274 {
3275         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3276
3277         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3278         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3279         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3280         hdr->itt                = cmd->init_task_tag;
3281         cmd->stat_sn            = conn->stat_sn++;
3282         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3283
3284         iscsit_increment_maxcmdsn(cmd, conn->sess);
3285         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3286         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3287
3288         pr_debug("Built Task Management Response ITT: 0x%08x,"
3289                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3290                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3291 }
3292 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3293
3294 static int
3295 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3296 {
3297         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3298         u32 tx_size = 0;
3299
3300         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3301
3302         cmd->iov_misc[0].iov_base       = cmd->pdu;
3303         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3304         tx_size += ISCSI_HDR_LEN;
3305
3306         if (conn->conn_ops->HeaderDigest) {
3307                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3308
3309                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3310                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3311
3312                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3313                 tx_size += ISCSI_CRC_LEN;
3314                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3315                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3316         }
3317
3318         cmd->iov_misc_count = 1;
3319         cmd->tx_size = tx_size;
3320
3321         return 0;
3322 }
3323
3324 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3325 {
3326         bool ret = false;
3327
3328         if (np->np_sockaddr.ss_family == AF_INET6) {
3329                 const struct sockaddr_in6 sin6 = {
3330                         .sin6_addr = IN6ADDR_ANY_INIT };
3331                 struct sockaddr_in6 *sock_in6 =
3332                          (struct sockaddr_in6 *)&np->np_sockaddr;
3333
3334                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3335                                 sin6.sin6_addr.s6_addr, 16))
3336                         ret = true;
3337         } else {
3338                 struct sockaddr_in * sock_in =
3339                         (struct sockaddr_in *)&np->np_sockaddr;
3340
3341                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3342                         ret = true;
3343         }
3344
3345         return ret;
3346 }
3347
3348 #define SENDTARGETS_BUF_LIMIT 32768U
3349
3350 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3351 {
3352         char *payload = NULL;
3353         struct iscsi_conn *conn = cmd->conn;
3354         struct iscsi_portal_group *tpg;
3355         struct iscsi_tiqn *tiqn;
3356         struct iscsi_tpg_np *tpg_np;
3357         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3358         int target_name_printed;
3359         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3360         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3361
3362         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3363                          SENDTARGETS_BUF_LIMIT);
3364
3365         payload = kzalloc(buffer_len, GFP_KERNEL);
3366         if (!payload) {
3367                 pr_err("Unable to allocate memory for sendtargets"
3368                                 " response.\n");
3369                 return -ENOMEM;
3370         }
3371         /*
3372          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3373          * explicit case..
3374          */
3375         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3376                 text_ptr = strchr(text_in, '=');
3377                 if (!text_ptr) {
3378                         pr_err("Unable to locate '=' string in text_in:"
3379                                " %s\n", text_in);
3380                         kfree(payload);
3381                         return -EINVAL;
3382                 }
3383                 /*
3384                  * Skip over '=' character..
3385                  */
3386                 text_ptr += 1;
3387         }
3388
3389         spin_lock(&tiqn_lock);
3390         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3391                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3392                      strcmp(tiqn->tiqn, text_ptr)) {
3393                         continue;
3394                 }
3395
3396                 target_name_printed = 0;
3397
3398                 spin_lock(&tiqn->tiqn_tpg_lock);
3399                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3400
3401                         /* If demo_mode_discovery=0 and generate_node_acls=0
3402                          * (demo mode dislabed) do not return
3403                          * TargetName+TargetAddress unless a NodeACL exists.
3404                          */
3405
3406                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3407                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3408                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3409                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3410                                 continue;
3411                         }
3412
3413                         spin_lock(&tpg->tpg_state_lock);
3414                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3415                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3416                                 spin_unlock(&tpg->tpg_state_lock);
3417                                 continue;
3418                         }
3419                         spin_unlock(&tpg->tpg_state_lock);
3420
3421                         spin_lock(&tpg->tpg_np_lock);
3422                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3423                                                 tpg_np_list) {
3424                                 struct iscsi_np *np = tpg_np->tpg_np;
3425                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3426
3427                                 if (!target_name_printed) {
3428                                         len = sprintf(buf, "TargetName=%s",
3429                                                       tiqn->tiqn);
3430                                         len += 1;
3431
3432                                         if ((len + payload_len) > buffer_len) {
3433                                                 spin_unlock(&tpg->tpg_np_lock);
3434                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3435                                                 end_of_buf = 1;
3436                                                 goto eob;
3437                                         }
3438                                         memcpy(payload + payload_len, buf, len);
3439                                         payload_len += len;
3440                                         target_name_printed = 1;
3441                                 }
3442
3443                                 len = sprintf(buf, "TargetAddress="
3444                                         "%s:%hu,%hu",
3445                                         (inaddr_any == false) ?
3446                                                 np->np_ip : conn->local_ip,
3447                                         (inaddr_any == false) ?
3448                                                 np->np_port : conn->local_port,
3449                                         tpg->tpgt);
3450                                 len += 1;
3451
3452                                 if ((len + payload_len) > buffer_len) {
3453                                         spin_unlock(&tpg->tpg_np_lock);
3454                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3455                                         end_of_buf = 1;
3456                                         goto eob;
3457                                 }
3458                                 memcpy(payload + payload_len, buf, len);
3459                                 payload_len += len;
3460                         }
3461                         spin_unlock(&tpg->tpg_np_lock);
3462                 }
3463                 spin_unlock(&tiqn->tiqn_tpg_lock);
3464 eob:
3465                 if (end_of_buf)
3466                         break;
3467
3468                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3469                         break;
3470         }
3471         spin_unlock(&tiqn_lock);
3472
3473         cmd->buf_ptr = payload;
3474
3475         return payload_len;
3476 }
3477
3478 int
3479 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3480                       struct iscsi_text_rsp *hdr)
3481 {
3482         int text_length, padding;
3483
3484         text_length = iscsit_build_sendtargets_response(cmd);
3485         if (text_length < 0)
3486                 return text_length;
3487
3488         hdr->opcode = ISCSI_OP_TEXT_RSP;
3489         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3490         padding = ((-text_length) & 3);
3491         hton24(hdr->dlength, text_length);
3492         hdr->itt = cmd->init_task_tag;
3493         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3494         cmd->stat_sn = conn->stat_sn++;
3495         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3496
3497         iscsit_increment_maxcmdsn(cmd, conn->sess);
3498         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3499         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3500
3501         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3502                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3503                 text_length, conn->cid);
3504
3505         return text_length + padding;
3506 }
3507 EXPORT_SYMBOL(iscsit_build_text_rsp);
3508
3509 /*
3510  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3511  *      MaxRecvDataSegmentLength.
3512  */
3513 static int iscsit_send_text_rsp(
3514         struct iscsi_cmd *cmd,
3515         struct iscsi_conn *conn)
3516 {
3517         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3518         struct kvec *iov;
3519         u32 tx_size = 0;
3520         int text_length, iov_count = 0, rc;
3521
3522         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3523         if (rc < 0)
3524                 return rc;
3525
3526         text_length = rc;
3527         iov = &cmd->iov_misc[0];
3528         iov[iov_count].iov_base = cmd->pdu;
3529         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3530         iov[iov_count].iov_base = cmd->buf_ptr;
3531         iov[iov_count++].iov_len = text_length;
3532
3533         tx_size += (ISCSI_HDR_LEN + text_length);
3534
3535         if (conn->conn_ops->HeaderDigest) {
3536                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3537
3538                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3539                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3540
3541                 iov[0].iov_len += ISCSI_CRC_LEN;
3542                 tx_size += ISCSI_CRC_LEN;
3543                 pr_debug("Attaching CRC32 HeaderDigest for"
3544                         " Text Response PDU 0x%08x\n", *header_digest);
3545         }
3546
3547         if (conn->conn_ops->DataDigest) {
3548                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3549                                 cmd->buf_ptr, text_length,
3550                                 0, NULL, (u8 *)&cmd->data_crc);
3551
3552                 iov[iov_count].iov_base = &cmd->data_crc;
3553                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3554                 tx_size += ISCSI_CRC_LEN;
3555
3556                 pr_debug("Attaching DataDigest for %u bytes of text"
3557                         " data, CRC 0x%08x\n", text_length,
3558                         cmd->data_crc);
3559         }
3560
3561         cmd->iov_misc_count = iov_count;
3562         cmd->tx_size = tx_size;
3563
3564         return 0;
3565 }
3566
3567 void
3568 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3569                     struct iscsi_reject *hdr)
3570 {
3571         hdr->opcode             = ISCSI_OP_REJECT;
3572         hdr->reason             = cmd->reject_reason;
3573         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3574         hton24(hdr->dlength, ISCSI_HDR_LEN);
3575         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3576         cmd->stat_sn            = conn->stat_sn++;
3577         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3578         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3579         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3580
3581 }
3582 EXPORT_SYMBOL(iscsit_build_reject);
3583
3584 static int iscsit_send_reject(
3585         struct iscsi_cmd *cmd,
3586         struct iscsi_conn *conn)
3587 {
3588         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3589         struct kvec *iov;
3590         u32 iov_count = 0, tx_size;
3591
3592         iscsit_build_reject(cmd, conn, hdr);
3593
3594         iov = &cmd->iov_misc[0];
3595         iov[iov_count].iov_base = cmd->pdu;
3596         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3597         iov[iov_count].iov_base = cmd->buf_ptr;
3598         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3599
3600         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3601
3602         if (conn->conn_ops->HeaderDigest) {
3603                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3604
3605                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3606                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3607
3608                 iov[0].iov_len += ISCSI_CRC_LEN;
3609                 tx_size += ISCSI_CRC_LEN;
3610                 pr_debug("Attaching CRC32 HeaderDigest for"
3611                         " REJECT PDU 0x%08x\n", *header_digest);
3612         }
3613
3614         if (conn->conn_ops->DataDigest) {
3615                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3616                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3617
3618                 iov[iov_count].iov_base = &cmd->data_crc;
3619                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3620                 tx_size += ISCSI_CRC_LEN;
3621                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3622                                 " PDU 0x%08x\n", cmd->data_crc);
3623         }
3624
3625         cmd->iov_misc_count = iov_count;
3626         cmd->tx_size = tx_size;
3627
3628         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3629                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3630
3631         return 0;
3632 }
3633
3634 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3635 {
3636         struct iscsi_thread_set *ts = conn->thread_set;
3637         int ord, cpu;
3638         /*
3639          * thread_id is assigned from iscsit_global->ts_bitmap from
3640          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3641          *
3642          * Here we use thread_id to determine which CPU that this
3643          * iSCSI connection's iscsi_thread_set will be scheduled to
3644          * execute upon.
3645          */
3646         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3647         for_each_online_cpu(cpu) {
3648                 if (ord-- == 0) {
3649                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3650                         return;
3651                 }
3652         }
3653         /*
3654          * This should never be reached..
3655          */
3656         dump_stack();
3657         cpumask_setall(conn->conn_cpumask);
3658 }
3659
3660 static inline void iscsit_thread_check_cpumask(
3661         struct iscsi_conn *conn,
3662         struct task_struct *p,
3663         int mode)
3664 {
3665         char buf[128];
3666         /*
3667          * mode == 1 signals iscsi_target_tx_thread() usage.
3668          * mode == 0 signals iscsi_target_rx_thread() usage.
3669          */
3670         if (mode == 1) {
3671                 if (!conn->conn_tx_reset_cpumask)
3672                         return;
3673                 conn->conn_tx_reset_cpumask = 0;
3674         } else {
3675                 if (!conn->conn_rx_reset_cpumask)
3676                         return;
3677                 conn->conn_rx_reset_cpumask = 0;
3678         }
3679         /*
3680          * Update the CPU mask for this single kthread so that
3681          * both TX and RX kthreads are scheduled to run on the
3682          * same CPU.
3683          */
3684         memset(buf, 0, 128);
3685         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3686         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3687 }
3688
3689 static int
3690 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3691 {
3692         int ret;
3693
3694         switch (state) {
3695         case ISTATE_SEND_R2T:
3696                 ret = iscsit_send_r2t(cmd, conn);
3697                 if (ret < 0)
3698                         goto err;
3699                 break;
3700         case ISTATE_REMOVE:
3701                 spin_lock_bh(&conn->cmd_lock);
3702                 list_del(&cmd->i_conn_node);
3703                 spin_unlock_bh(&conn->cmd_lock);
3704
3705                 iscsit_free_cmd(cmd, false);
3706                 break;
3707         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3708                 iscsit_mod_nopin_response_timer(conn);
3709                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3710                 if (ret < 0)
3711                         goto err;
3712                 break;
3713         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3714                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3715                 if (ret < 0)
3716                         goto err;
3717                 break;
3718         default:
3719                 pr_err("Unknown Opcode: 0x%02x ITT:"
3720                        " 0x%08x, i_state: %d on CID: %hu\n",
3721                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3722                        conn->cid);
3723                 goto err;
3724         }
3725
3726         return 0;
3727
3728 err:
3729         return -1;
3730 }
3731
3732 static int
3733 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3734 {
3735         struct iscsit_transport *t = conn->conn_transport;
3736         struct iscsi_queue_req *qr;
3737         struct iscsi_cmd *cmd;
3738         u8 state;
3739         int ret;
3740
3741         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3742                 atomic_set(&conn->check_immediate_queue, 0);
3743                 cmd = qr->cmd;
3744                 state = qr->state;
3745                 kmem_cache_free(lio_qr_cache, qr);
3746
3747                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3748                 if (ret < 0)
3749                         return ret;
3750         }
3751
3752         return 0;
3753 }
3754
3755 static int
3756 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3757 {
3758         int ret;
3759
3760 check_rsp_state:
3761         switch (state) {
3762         case ISTATE_SEND_DATAIN:
3763                 ret = iscsit_send_datain(cmd, conn);
3764                 if (ret < 0)
3765                         goto err;
3766                 else if (!ret)
3767                         /* more drs */
3768                         goto check_rsp_state;
3769                 else if (ret == 1) {
3770                         /* all done */
3771                         spin_lock_bh(&cmd->istate_lock);
3772                         cmd->i_state = ISTATE_SENT_STATUS;
3773                         spin_unlock_bh(&cmd->istate_lock);
3774
3775                         if (atomic_read(&conn->check_immediate_queue))
3776                                 return 1;
3777
3778                         return 0;
3779                 } else if (ret == 2) {
3780                         /* Still must send status,
3781                            SCF_TRANSPORT_TASK_SENSE was set */
3782                         spin_lock_bh(&cmd->istate_lock);
3783                         cmd->i_state = ISTATE_SEND_STATUS;
3784                         spin_unlock_bh(&cmd->istate_lock);
3785                         state = ISTATE_SEND_STATUS;
3786                         goto check_rsp_state;
3787                 }
3788
3789                 break;
3790         case ISTATE_SEND_STATUS:
3791         case ISTATE_SEND_STATUS_RECOVERY:
3792                 ret = iscsit_send_response(cmd, conn);
3793                 break;
3794         case ISTATE_SEND_LOGOUTRSP:
3795                 ret = iscsit_send_logout(cmd, conn);
3796                 break;
3797         case ISTATE_SEND_ASYNCMSG:
3798                 ret = iscsit_send_conn_drop_async_message(
3799                         cmd, conn);
3800                 break;
3801         case ISTATE_SEND_NOPIN:
3802                 ret = iscsit_send_nopin(cmd, conn);
3803                 break;
3804         case ISTATE_SEND_REJECT:
3805                 ret = iscsit_send_reject(cmd, conn);
3806                 break;
3807         case ISTATE_SEND_TASKMGTRSP:
3808                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3809                 if (ret != 0)
3810                         break;
3811                 ret = iscsit_tmr_post_handler(cmd, conn);
3812                 if (ret != 0)
3813                         iscsit_fall_back_to_erl0(conn->sess);
3814                 break;
3815         case ISTATE_SEND_TEXTRSP:
3816                 ret = iscsit_send_text_rsp(cmd, conn);
3817                 break;
3818         default:
3819                 pr_err("Unknown Opcode: 0x%02x ITT:"
3820                        " 0x%08x, i_state: %d on CID: %hu\n",
3821                        cmd->iscsi_opcode, cmd->init_task_tag,
3822                        state, conn->cid);
3823                 goto err;
3824         }
3825         if (ret < 0)
3826                 goto err;
3827
3828         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3829                 iscsit_tx_thread_wait_for_tcp(conn);
3830                 iscsit_unmap_iovec(cmd);
3831                 goto err;
3832         }
3833         iscsit_unmap_iovec(cmd);
3834
3835         switch (state) {
3836         case ISTATE_SEND_LOGOUTRSP:
3837                 if (!iscsit_logout_post_handler(cmd, conn))
3838                         goto restart;
3839                 /* fall through */
3840         case ISTATE_SEND_STATUS:
3841         case ISTATE_SEND_ASYNCMSG:
3842         case ISTATE_SEND_NOPIN:
3843         case ISTATE_SEND_STATUS_RECOVERY:
3844         case ISTATE_SEND_TEXTRSP:
3845         case ISTATE_SEND_TASKMGTRSP:
3846         case ISTATE_SEND_REJECT:
3847                 spin_lock_bh(&cmd->istate_lock);
3848                 cmd->i_state = ISTATE_SENT_STATUS;
3849                 spin_unlock_bh(&cmd->istate_lock);
3850                 break;
3851         default:
3852                 pr_err("Unknown Opcode: 0x%02x ITT:"
3853                        " 0x%08x, i_state: %d on CID: %hu\n",
3854                        cmd->iscsi_opcode, cmd->init_task_tag,
3855                        cmd->i_state, conn->cid);
3856                 goto err;
3857         }
3858
3859         if (atomic_read(&conn->check_immediate_queue))
3860                 return 1;
3861
3862         return 0;
3863
3864 err:
3865         return -1;
3866 restart:
3867         return -EAGAIN;
3868 }
3869
3870 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3871 {
3872         struct iscsit_transport *t = conn->conn_transport;
3873         struct iscsi_queue_req *qr;
3874         struct iscsi_cmd *cmd;
3875         u8 state;
3876         int ret;
3877
3878         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3879                 cmd = qr->cmd;
3880                 state = qr->state;
3881                 kmem_cache_free(lio_qr_cache, qr);
3882
3883                 ret = t->iscsit_response_queue(conn, cmd, state);
3884                 if (ret == 1 || ret < 0)
3885                         return ret;
3886         }
3887
3888         return 0;
3889 }
3890
3891 int iscsi_target_tx_thread(void *arg)
3892 {
3893         int ret = 0;
3894         struct iscsi_conn *conn;
3895         struct iscsi_thread_set *ts = arg;
3896         /*
3897          * Allow ourselves to be interrupted by SIGINT so that a
3898          * connection recovery / failure event can be triggered externally.
3899          */
3900         allow_signal(SIGINT);
3901
3902 restart:
3903         conn = iscsi_tx_thread_pre_handler(ts);
3904         if (!conn)
3905                 goto out;
3906
3907         ret = 0;
3908
3909         while (!kthread_should_stop()) {
3910                 /*
3911                  * Ensure that both TX and RX per connection kthreads
3912                  * are scheduled to run on the same CPU.
3913                  */
3914                 iscsit_thread_check_cpumask(conn, current, 1);
3915
3916                 wait_event_interruptible(conn->queues_wq,
3917                                          !iscsit_conn_all_queues_empty(conn) ||
3918                                          ts->status == ISCSI_THREAD_SET_RESET);
3919
3920                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3921                      signal_pending(current))
3922                         goto transport_err;
3923
3924 get_immediate:
3925                 ret = iscsit_handle_immediate_queue(conn);
3926                 if (ret < 0)
3927                         goto transport_err;
3928
3929                 ret = iscsit_handle_response_queue(conn);
3930                 if (ret == 1)
3931                         goto get_immediate;
3932                 else if (ret == -EAGAIN)
3933                         goto restart;
3934                 else if (ret < 0)
3935                         goto transport_err;
3936         }
3937
3938 transport_err:
3939         iscsit_take_action_for_connection_exit(conn);
3940         goto restart;
3941 out:
3942         return 0;
3943 }
3944
3945 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3946 {
3947         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3948         struct iscsi_cmd *cmd;
3949         int ret = 0;
3950
3951         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3952         case ISCSI_OP_SCSI_CMD:
3953                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3954                 if (!cmd)
3955                         goto reject;
3956
3957                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3958                 break;
3959         case ISCSI_OP_SCSI_DATA_OUT:
3960                 ret = iscsit_handle_data_out(conn, buf);
3961                 break;
3962         case ISCSI_OP_NOOP_OUT:
3963                 cmd = NULL;
3964                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3965                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3966                         if (!cmd)
3967                                 goto reject;
3968                 }
3969                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3970                 break;
3971         case ISCSI_OP_SCSI_TMFUNC:
3972                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3973                 if (!cmd)
3974                         goto reject;
3975
3976                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3977                 break;
3978         case ISCSI_OP_TEXT:
3979                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3980                 if (!cmd)
3981                         goto reject;
3982
3983                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3984                 break;
3985         case ISCSI_OP_LOGOUT:
3986                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3987                 if (!cmd)
3988                         goto reject;
3989
3990                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3991                 if (ret > 0)
3992                         wait_for_completion_timeout(&conn->conn_logout_comp,
3993                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3994                 break;
3995         case ISCSI_OP_SNACK:
3996                 ret = iscsit_handle_snack(conn, buf);
3997                 break;
3998         default:
3999                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4000                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4001                         pr_err("Cannot recover from unknown"
4002                         " opcode while ERL=0, closing iSCSI connection.\n");
4003                         return -1;
4004                 }
4005                 if (!conn->conn_ops->OFMarker) {
4006                         pr_err("Unable to recover from unknown"
4007                         " opcode while OFMarker=No, closing iSCSI"
4008                                 " connection.\n");
4009                         return -1;
4010                 }
4011                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4012                         pr_err("Unable to recover from unknown"
4013                                 " opcode, closing iSCSI connection.\n");
4014                         return -1;
4015                 }
4016                 break;
4017         }
4018
4019         return ret;
4020 reject:
4021         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4022 }
4023
4024 int iscsi_target_rx_thread(void *arg)
4025 {
4026         int ret;
4027         u8 buffer[ISCSI_HDR_LEN], opcode;
4028         u32 checksum = 0, digest = 0;
4029         struct iscsi_conn *conn = NULL;
4030         struct iscsi_thread_set *ts = arg;
4031         struct kvec iov;
4032         /*
4033          * Allow ourselves to be interrupted by SIGINT so that a
4034          * connection recovery / failure event can be triggered externally.
4035          */
4036         allow_signal(SIGINT);
4037
4038 restart:
4039         conn = iscsi_rx_thread_pre_handler(ts);
4040         if (!conn)
4041                 goto out;
4042
4043         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4044                 struct completion comp;
4045                 int rc;
4046
4047                 init_completion(&comp);
4048                 rc = wait_for_completion_interruptible(&comp);
4049                 if (rc < 0)
4050                         goto transport_err;
4051
4052                 goto out;
4053         }
4054
4055         while (!kthread_should_stop()) {
4056                 /*
4057                  * Ensure that both TX and RX per connection kthreads
4058                  * are scheduled to run on the same CPU.
4059                  */
4060                 iscsit_thread_check_cpumask(conn, current, 0);
4061
4062                 memset(buffer, 0, ISCSI_HDR_LEN);
4063                 memset(&iov, 0, sizeof(struct kvec));
4064
4065                 iov.iov_base    = buffer;
4066                 iov.iov_len     = ISCSI_HDR_LEN;
4067
4068                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4069                 if (ret != ISCSI_HDR_LEN) {
4070                         iscsit_rx_thread_wait_for_tcp(conn);
4071                         goto transport_err;
4072                 }
4073
4074                 if (conn->conn_ops->HeaderDigest) {
4075                         iov.iov_base    = &digest;
4076                         iov.iov_len     = ISCSI_CRC_LEN;
4077
4078                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4079                         if (ret != ISCSI_CRC_LEN) {
4080                                 iscsit_rx_thread_wait_for_tcp(conn);
4081                                 goto transport_err;
4082                         }
4083
4084                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4085                                         buffer, ISCSI_HDR_LEN,
4086                                         0, NULL, (u8 *)&checksum);
4087
4088                         if (digest != checksum) {
4089                                 pr_err("HeaderDigest CRC32C failed,"
4090                                         " received 0x%08x, computed 0x%08x\n",
4091                                         digest, checksum);
4092                                 /*
4093                                  * Set the PDU to 0xff so it will intentionally
4094                                  * hit default in the switch below.
4095                                  */
4096                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4097                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4098                         } else {
4099                                 pr_debug("Got HeaderDigest CRC32C"
4100                                                 " 0x%08x\n", checksum);
4101                         }
4102                 }
4103
4104                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4105                         goto transport_err;
4106
4107                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4108
4109                 if (conn->sess->sess_ops->SessionType &&
4110                    ((!(opcode & ISCSI_OP_TEXT)) ||
4111                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4112                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4113                         " while in Discovery Session, rejecting.\n", opcode);
4114                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4115                                           buffer);
4116                         goto transport_err;
4117                 }
4118
4119                 ret = iscsi_target_rx_opcode(conn, buffer);
4120                 if (ret < 0)
4121                         goto transport_err;
4122         }
4123
4124 transport_err:
4125         if (!signal_pending(current))
4126                 atomic_set(&conn->transport_failed, 1);
4127         iscsit_take_action_for_connection_exit(conn);
4128         goto restart;
4129 out:
4130         return 0;
4131 }
4132
4133 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4134 {
4135         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4136         struct iscsi_session *sess = conn->sess;
4137         /*
4138          * We expect this function to only ever be called from either RX or TX
4139          * thread context via iscsit_close_connection() once the other context
4140          * has been reset -> returned sleeping pre-handler state.
4141          */
4142         spin_lock_bh(&conn->cmd_lock);
4143         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4144
4145                 list_del(&cmd->i_conn_node);
4146                 spin_unlock_bh(&conn->cmd_lock);
4147
4148                 iscsit_increment_maxcmdsn(cmd, sess);
4149
4150                 iscsit_free_cmd(cmd, true);
4151
4152                 spin_lock_bh(&conn->cmd_lock);
4153         }
4154         spin_unlock_bh(&conn->cmd_lock);
4155 }
4156
4157 static void iscsit_stop_timers_for_cmds(
4158         struct iscsi_conn *conn)
4159 {
4160         struct iscsi_cmd *cmd;
4161
4162         spin_lock_bh(&conn->cmd_lock);
4163         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4164                 if (cmd->data_direction == DMA_TO_DEVICE)
4165                         iscsit_stop_dataout_timer(cmd);
4166         }
4167         spin_unlock_bh(&conn->cmd_lock);
4168 }
4169
4170 int iscsit_close_connection(
4171         struct iscsi_conn *conn)
4172 {
4173         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4174         struct iscsi_session    *sess = conn->sess;
4175
4176         pr_debug("Closing iSCSI connection CID %hu on SID:"
4177                 " %u\n", conn->cid, sess->sid);
4178         /*
4179          * Always up conn_logout_comp just in case the RX Thread is sleeping
4180          * and the logout response never got sent because the connection
4181          * failed.
4182          */
4183         complete(&conn->conn_logout_comp);
4184
4185         iscsi_release_thread_set(conn);
4186
4187         iscsit_stop_timers_for_cmds(conn);
4188         iscsit_stop_nopin_response_timer(conn);
4189         iscsit_stop_nopin_timer(conn);
4190         iscsit_free_queue_reqs_for_conn(conn);
4191
4192         /*
4193          * During Connection recovery drop unacknowledged out of order
4194          * commands for this connection, and prepare the other commands
4195          * for realligence.
4196          *
4197          * During normal operation clear the out of order commands (but
4198          * do not free the struct iscsi_ooo_cmdsn's) and release all
4199          * struct iscsi_cmds.
4200          */
4201         if (atomic_read(&conn->connection_recovery)) {
4202                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4203                 iscsit_prepare_cmds_for_realligance(conn);
4204         } else {
4205                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4206                 iscsit_release_commands_from_conn(conn);
4207         }
4208
4209         /*
4210          * Handle decrementing session or connection usage count if
4211          * a logout response was not able to be sent because the
4212          * connection failed.  Fall back to Session Recovery here.
4213          */
4214         if (atomic_read(&conn->conn_logout_remove)) {
4215                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4216                         iscsit_dec_conn_usage_count(conn);
4217                         iscsit_dec_session_usage_count(sess);
4218                 }
4219                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4220                         iscsit_dec_conn_usage_count(conn);
4221
4222                 atomic_set(&conn->conn_logout_remove, 0);
4223                 atomic_set(&sess->session_reinstatement, 0);
4224                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4225         }
4226
4227         spin_lock_bh(&sess->conn_lock);
4228         list_del(&conn->conn_list);
4229
4230         /*
4231          * Attempt to let the Initiator know this connection failed by
4232          * sending an Connection Dropped Async Message on another
4233          * active connection.
4234          */
4235         if (atomic_read(&conn->connection_recovery))
4236                 iscsit_build_conn_drop_async_message(conn);
4237
4238         spin_unlock_bh(&sess->conn_lock);
4239
4240         /*
4241          * If connection reinstatement is being performed on this connection,
4242          * up the connection reinstatement semaphore that is being blocked on
4243          * in iscsit_cause_connection_reinstatement().
4244          */
4245         spin_lock_bh(&conn->state_lock);
4246         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4247                 spin_unlock_bh(&conn->state_lock);
4248                 complete(&conn->conn_wait_comp);
4249                 wait_for_completion(&conn->conn_post_wait_comp);
4250                 spin_lock_bh(&conn->state_lock);
4251         }
4252
4253         /*
4254          * If connection reinstatement is being performed on this connection
4255          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4256          * connection wait rcfr semaphore that is being blocked on
4257          * an iscsit_connection_reinstatement_rcfr().
4258          */
4259         if (atomic_read(&conn->connection_wait_rcfr)) {
4260                 spin_unlock_bh(&conn->state_lock);
4261                 complete(&conn->conn_wait_rcfr_comp);
4262                 wait_for_completion(&conn->conn_post_wait_comp);
4263                 spin_lock_bh(&conn->state_lock);
4264         }
4265         atomic_set(&conn->connection_reinstatement, 1);
4266         spin_unlock_bh(&conn->state_lock);
4267
4268         /*
4269          * If any other processes are accessing this connection pointer we
4270          * must wait until they have completed.
4271          */
4272         iscsit_check_conn_usage_count(conn);
4273
4274         if (conn->conn_rx_hash.tfm)
4275                 crypto_free_hash(conn->conn_rx_hash.tfm);
4276         if (conn->conn_tx_hash.tfm)
4277                 crypto_free_hash(conn->conn_tx_hash.tfm);
4278
4279         if (conn->conn_cpumask)
4280                 free_cpumask_var(conn->conn_cpumask);
4281
4282         kfree(conn->conn_ops);
4283         conn->conn_ops = NULL;
4284
4285         if (conn->sock)
4286                 sock_release(conn->sock);
4287
4288         if (conn->conn_transport->iscsit_free_conn)
4289                 conn->conn_transport->iscsit_free_conn(conn);
4290
4291         iscsit_put_transport(conn->conn_transport);
4292
4293         conn->thread_set = NULL;
4294
4295         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4296         conn->conn_state = TARG_CONN_STATE_FREE;
4297         kfree(conn);
4298
4299         spin_lock_bh(&sess->conn_lock);
4300         atomic_dec(&sess->nconn);
4301         pr_debug("Decremented iSCSI connection count to %hu from node:"
4302                 " %s\n", atomic_read(&sess->nconn),
4303                 sess->sess_ops->InitiatorName);
4304         /*
4305          * Make sure that if one connection fails in an non ERL=2 iSCSI
4306          * Session that they all fail.
4307          */
4308         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4309              !atomic_read(&sess->session_logout))
4310                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4311
4312         /*
4313          * If this was not the last connection in the session, and we are
4314          * performing session reinstatement or falling back to ERL=0, call
4315          * iscsit_stop_session() without sleeping to shutdown the other
4316          * active connections.
4317          */
4318         if (atomic_read(&sess->nconn)) {
4319                 if (!atomic_read(&sess->session_reinstatement) &&
4320                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4321                         spin_unlock_bh(&sess->conn_lock);
4322                         return 0;
4323                 }
4324                 if (!atomic_read(&sess->session_stop_active)) {
4325                         atomic_set(&sess->session_stop_active, 1);
4326                         spin_unlock_bh(&sess->conn_lock);
4327                         iscsit_stop_session(sess, 0, 0);
4328                         return 0;
4329                 }
4330                 spin_unlock_bh(&sess->conn_lock);
4331                 return 0;
4332         }
4333
4334         /*
4335          * If this was the last connection in the session and one of the
4336          * following is occurring:
4337          *
4338          * Session Reinstatement is not being performed, and are falling back
4339          * to ERL=0 call iscsit_close_session().
4340          *
4341          * Session Logout was requested.  iscsit_close_session() will be called
4342          * elsewhere.
4343          *
4344          * Session Continuation is not being performed, start the Time2Retain
4345          * handler and check if sleep_on_sess_wait_sem is active.
4346          */
4347         if (!atomic_read(&sess->session_reinstatement) &&
4348              atomic_read(&sess->session_fall_back_to_erl0)) {
4349                 spin_unlock_bh(&sess->conn_lock);
4350                 target_put_session(sess->se_sess);
4351
4352                 return 0;
4353         } else if (atomic_read(&sess->session_logout)) {
4354                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4355                 sess->session_state = TARG_SESS_STATE_FREE;
4356                 spin_unlock_bh(&sess->conn_lock);
4357
4358                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4359                         complete(&sess->session_wait_comp);
4360
4361                 return 0;
4362         } else {
4363                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4364                 sess->session_state = TARG_SESS_STATE_FAILED;
4365
4366                 if (!atomic_read(&sess->session_continuation)) {
4367                         spin_unlock_bh(&sess->conn_lock);
4368                         iscsit_start_time2retain_handler(sess);
4369                 } else
4370                         spin_unlock_bh(&sess->conn_lock);
4371
4372                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4373                         complete(&sess->session_wait_comp);
4374
4375                 return 0;
4376         }
4377         spin_unlock_bh(&sess->conn_lock);
4378
4379         return 0;
4380 }
4381
4382 int iscsit_close_session(struct iscsi_session *sess)
4383 {
4384         struct iscsi_portal_group *tpg = sess->tpg;
4385         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4386
4387         if (atomic_read(&sess->nconn)) {
4388                 pr_err("%d connection(s) still exist for iSCSI session"
4389                         " to %s\n", atomic_read(&sess->nconn),
4390                         sess->sess_ops->InitiatorName);
4391                 BUG();
4392         }
4393
4394         spin_lock_bh(&se_tpg->session_lock);
4395         atomic_set(&sess->session_logout, 1);
4396         atomic_set(&sess->session_reinstatement, 1);
4397         iscsit_stop_time2retain_timer(sess);
4398         spin_unlock_bh(&se_tpg->session_lock);
4399
4400         /*
4401          * transport_deregister_session_configfs() will clear the
4402          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4403          * can be setting it again with __transport_register_session() in
4404          * iscsi_post_login_handler() again after the iscsit_stop_session()
4405          * completes in iscsi_np context.
4406          */
4407         transport_deregister_session_configfs(sess->se_sess);
4408
4409         /*
4410          * If any other processes are accessing this session pointer we must
4411          * wait until they have completed.  If we are in an interrupt (the
4412          * time2retain handler) and contain and active session usage count we
4413          * restart the timer and exit.
4414          */
4415         if (!in_interrupt()) {
4416                 if (iscsit_check_session_usage_count(sess) == 1)
4417                         iscsit_stop_session(sess, 1, 1);
4418         } else {
4419                 if (iscsit_check_session_usage_count(sess) == 2) {
4420                         atomic_set(&sess->session_logout, 0);
4421                         iscsit_start_time2retain_handler(sess);
4422                         return 0;
4423                 }
4424         }
4425
4426         transport_deregister_session(sess->se_sess);
4427
4428         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4429                 iscsit_free_connection_recovery_entires(sess);
4430
4431         iscsit_free_all_ooo_cmdsns(sess);
4432
4433         spin_lock_bh(&se_tpg->session_lock);
4434         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4435         sess->session_state = TARG_SESS_STATE_FREE;
4436         pr_debug("Released iSCSI session from node: %s\n",
4437                         sess->sess_ops->InitiatorName);
4438         tpg->nsessions--;
4439         if (tpg->tpg_tiqn)
4440                 tpg->tpg_tiqn->tiqn_nsessions--;
4441
4442         pr_debug("Decremented number of active iSCSI Sessions on"
4443                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4444
4445         spin_lock(&sess_idr_lock);
4446         idr_remove(&sess_idr, sess->session_index);
4447         spin_unlock(&sess_idr_lock);
4448
4449         kfree(sess->sess_ops);
4450         sess->sess_ops = NULL;
4451         spin_unlock_bh(&se_tpg->session_lock);
4452
4453         kfree(sess);
4454         return 0;
4455 }
4456
4457 static void iscsit_logout_post_handler_closesession(
4458         struct iscsi_conn *conn)
4459 {
4460         struct iscsi_session *sess = conn->sess;
4461
4462         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4463         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4464
4465         atomic_set(&conn->conn_logout_remove, 0);
4466         complete(&conn->conn_logout_comp);
4467
4468         iscsit_dec_conn_usage_count(conn);
4469         iscsit_stop_session(sess, 1, 1);
4470         iscsit_dec_session_usage_count(sess);
4471         target_put_session(sess->se_sess);
4472 }
4473
4474 static void iscsit_logout_post_handler_samecid(
4475         struct iscsi_conn *conn)
4476 {
4477         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4478         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4479
4480         atomic_set(&conn->conn_logout_remove, 0);
4481         complete(&conn->conn_logout_comp);
4482
4483         iscsit_cause_connection_reinstatement(conn, 1);
4484         iscsit_dec_conn_usage_count(conn);
4485 }
4486
4487 static void iscsit_logout_post_handler_diffcid(
4488         struct iscsi_conn *conn,
4489         u16 cid)
4490 {
4491         struct iscsi_conn *l_conn;
4492         struct iscsi_session *sess = conn->sess;
4493
4494         if (!sess)
4495                 return;
4496
4497         spin_lock_bh(&sess->conn_lock);
4498         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4499                 if (l_conn->cid == cid) {
4500                         iscsit_inc_conn_usage_count(l_conn);
4501                         break;
4502                 }
4503         }
4504         spin_unlock_bh(&sess->conn_lock);
4505
4506         if (!l_conn)
4507                 return;
4508
4509         if (l_conn->sock)
4510                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4511
4512         spin_lock_bh(&l_conn->state_lock);
4513         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4514         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4515         spin_unlock_bh(&l_conn->state_lock);
4516
4517         iscsit_cause_connection_reinstatement(l_conn, 1);
4518         iscsit_dec_conn_usage_count(l_conn);
4519 }
4520
4521 /*
4522  *      Return of 0 causes the TX thread to restart.
4523  */
4524 int iscsit_logout_post_handler(
4525         struct iscsi_cmd *cmd,
4526         struct iscsi_conn *conn)
4527 {
4528         int ret = 0;
4529
4530         switch (cmd->logout_reason) {
4531         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4532                 switch (cmd->logout_response) {
4533                 case ISCSI_LOGOUT_SUCCESS:
4534                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4535                 default:
4536                         iscsit_logout_post_handler_closesession(conn);
4537                         break;
4538                 }
4539                 ret = 0;
4540                 break;
4541         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4542                 if (conn->cid == cmd->logout_cid) {
4543                         switch (cmd->logout_response) {
4544                         case ISCSI_LOGOUT_SUCCESS:
4545                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4546                         default:
4547                                 iscsit_logout_post_handler_samecid(conn);
4548                                 break;
4549                         }
4550                         ret = 0;
4551                 } else {
4552                         switch (cmd->logout_response) {
4553                         case ISCSI_LOGOUT_SUCCESS:
4554                                 iscsit_logout_post_handler_diffcid(conn,
4555                                         cmd->logout_cid);
4556                                 break;
4557                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4558                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4559                         default:
4560                                 break;
4561                         }
4562                         ret = 1;
4563                 }
4564                 break;
4565         case ISCSI_LOGOUT_REASON_RECOVERY:
4566                 switch (cmd->logout_response) {
4567                 case ISCSI_LOGOUT_SUCCESS:
4568                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4569                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4570                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4571                 default:
4572                         break;
4573                 }
4574                 ret = 1;
4575                 break;
4576         default:
4577                 break;
4578
4579         }
4580         return ret;
4581 }
4582 EXPORT_SYMBOL(iscsit_logout_post_handler);
4583
4584 void iscsit_fail_session(struct iscsi_session *sess)
4585 {
4586         struct iscsi_conn *conn;
4587
4588         spin_lock_bh(&sess->conn_lock);
4589         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4590                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4591                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4592         }
4593         spin_unlock_bh(&sess->conn_lock);
4594
4595         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4596         sess->session_state = TARG_SESS_STATE_FAILED;
4597 }
4598
4599 int iscsit_free_session(struct iscsi_session *sess)
4600 {
4601         u16 conn_count = atomic_read(&sess->nconn);
4602         struct iscsi_conn *conn, *conn_tmp = NULL;
4603         int is_last;
4604
4605         spin_lock_bh(&sess->conn_lock);
4606         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4607
4608         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4609                         conn_list) {
4610                 if (conn_count == 0)
4611                         break;
4612
4613                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4614                         is_last = 1;
4615                 } else {
4616                         iscsit_inc_conn_usage_count(conn_tmp);
4617                         is_last = 0;
4618                 }
4619                 iscsit_inc_conn_usage_count(conn);
4620
4621                 spin_unlock_bh(&sess->conn_lock);
4622                 iscsit_cause_connection_reinstatement(conn, 1);
4623                 spin_lock_bh(&sess->conn_lock);
4624
4625                 iscsit_dec_conn_usage_count(conn);
4626                 if (is_last == 0)
4627                         iscsit_dec_conn_usage_count(conn_tmp);
4628
4629                 conn_count--;
4630         }
4631
4632         if (atomic_read(&sess->nconn)) {
4633                 spin_unlock_bh(&sess->conn_lock);
4634                 wait_for_completion(&sess->session_wait_comp);
4635         } else
4636                 spin_unlock_bh(&sess->conn_lock);
4637
4638         target_put_session(sess->se_sess);
4639         return 0;
4640 }
4641
4642 void iscsit_stop_session(
4643         struct iscsi_session *sess,
4644         int session_sleep,
4645         int connection_sleep)
4646 {
4647         u16 conn_count = atomic_read(&sess->nconn);
4648         struct iscsi_conn *conn, *conn_tmp = NULL;
4649         int is_last;
4650
4651         spin_lock_bh(&sess->conn_lock);
4652         if (session_sleep)
4653                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4654
4655         if (connection_sleep) {
4656                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4657                                 conn_list) {
4658                         if (conn_count == 0)
4659                                 break;
4660
4661                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4662                                 is_last = 1;
4663                         } else {
4664                                 iscsit_inc_conn_usage_count(conn_tmp);
4665                                 is_last = 0;
4666                         }
4667                         iscsit_inc_conn_usage_count(conn);
4668
4669                         spin_unlock_bh(&sess->conn_lock);
4670                         iscsit_cause_connection_reinstatement(conn, 1);
4671                         spin_lock_bh(&sess->conn_lock);
4672
4673                         iscsit_dec_conn_usage_count(conn);
4674                         if (is_last == 0)
4675                                 iscsit_dec_conn_usage_count(conn_tmp);
4676                         conn_count--;
4677                 }
4678         } else {
4679                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4680                         iscsit_cause_connection_reinstatement(conn, 0);
4681         }
4682
4683         if (session_sleep && atomic_read(&sess->nconn)) {
4684                 spin_unlock_bh(&sess->conn_lock);
4685                 wait_for_completion(&sess->session_wait_comp);
4686         } else
4687                 spin_unlock_bh(&sess->conn_lock);
4688 }
4689
4690 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4691 {
4692         struct iscsi_session *sess;
4693         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4694         struct se_session *se_sess, *se_sess_tmp;
4695         int session_count = 0;
4696
4697         spin_lock_bh(&se_tpg->session_lock);
4698         if (tpg->nsessions && !force) {
4699                 spin_unlock_bh(&se_tpg->session_lock);
4700                 return -1;
4701         }
4702
4703         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4704                         sess_list) {
4705                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4706
4707                 spin_lock(&sess->conn_lock);
4708                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4709                     atomic_read(&sess->session_logout) ||
4710                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4711                         spin_unlock(&sess->conn_lock);
4712                         continue;
4713                 }
4714                 atomic_set(&sess->session_reinstatement, 1);
4715                 spin_unlock(&sess->conn_lock);
4716                 spin_unlock_bh(&se_tpg->session_lock);
4717
4718                 iscsit_free_session(sess);
4719                 spin_lock_bh(&se_tpg->session_lock);
4720
4721                 session_count++;
4722         }
4723         spin_unlock_bh(&se_tpg->session_lock);
4724
4725         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4726                         " Group: %hu\n", session_count, tpg->tpgt);
4727         return 0;
4728 }
4729
4730 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4731 MODULE_VERSION("4.1.x");
4732 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4733 MODULE_LICENSE("GPL");
4734
4735 module_init(iscsi_target_init_module);
4736 module_exit(iscsi_target_cleanup_module);