drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31
  32 #include "iscsi_target_core.h"
  33 #include "iscsi_target_parameters.h"
  34 #include "iscsi_target_seq_pdu_list.h"
  35 #include "iscsi_target_tq.h"
  36 #include "iscsi_target_configfs.h"
  37 #include "iscsi_target_datain_values.h"
  38 #include "iscsi_target_erl0.h"
  39 #include "iscsi_target_erl1.h"
  40 #include "iscsi_target_erl2.h"
  41 #include "iscsi_target_login.h"
  42 #include "iscsi_target_tmr.h"
  43 #include "iscsi_target_tpg.h"
  44 #include "iscsi_target_util.h"
  45 #include "iscsi_target.h"
  46 #include "iscsi_target_device.h"
  47 #include "iscsi_target_stat.h"
  48
  49 static LIST_HEAD(g_tiqn_list);
  50 static LIST_HEAD(g_np_list);
  51 static DEFINE_SPINLOCK(tiqn_lock);
  52 static DEFINE_SPINLOCK(np_lock);
  53
  54 static struct idr tiqn_idr;
  55 struct idr sess_idr;
  56 struct mutex auth_id_lock;
  57 spinlock_t sess_idr_lock;
  58
  59 struct iscsit_global *iscsit_global;
  60
  61 struct kmem_cache *lio_cmd_cache;
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         unsigned char *buf, u32);
  69 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  70
  71 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  72 {
  73         struct iscsi_tiqn *tiqn = NULL;
  74
  75         spin_lock(&tiqn_lock);
  76         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  77                 if (!strcmp(tiqn->tiqn, buf)) {
  78
  79                         spin_lock(&tiqn->tiqn_state_lock);
  80                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  81                                 tiqn->tiqn_access_count++;
  82                                 spin_unlock(&tiqn->tiqn_state_lock);
  83                                 spin_unlock(&tiqn_lock);
  84                                 return tiqn;
  85                         }
  86                         spin_unlock(&tiqn->tiqn_state_lock);
  87                 }
  88         }
  89         spin_unlock(&tiqn_lock);
  90
  91         return NULL;
  92 }
  93
  94 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  95 {
  96         spin_lock(&tiqn->tiqn_state_lock);
  97         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  98                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  99                 spin_unlock(&tiqn->tiqn_state_lock);
 100                 return 0;
 101         }
 102         spin_unlock(&tiqn->tiqn_state_lock);
 103
 104         return -1;
 105 }
 106
 107 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 108 {
 109         spin_lock(&tiqn->tiqn_state_lock);
 110         tiqn->tiqn_access_count--;
 111         spin_unlock(&tiqn->tiqn_state_lock);
 112 }
 113
 114 /*
 115  * Note that IQN formatting is expected to be done in userspace, and
 116  * no explict IQN format checks are done here.
 117  */
 118 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 119 {
 120         struct iscsi_tiqn *tiqn = NULL;
 121         int ret;
 122
 123         if (strlen(buf) >= ISCSI_IQN_LEN) {
 124                 pr_err("Target IQN exceeds %d bytes\n",
 125                                 ISCSI_IQN_LEN);
 126                 return ERR_PTR(-EINVAL);
 127         }
 128
 129         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 130         if (!tiqn) {
 131                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 132                 return ERR_PTR(-ENOMEM);
 133         }
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 145                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 146                 kfree(tiqn);
 147                 return ERR_PTR(-ENOMEM);
 148         }
 149         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 150
 151         spin_lock(&tiqn_lock);
 152         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 153         if (ret < 0) {
 154                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 155                 spin_unlock(&tiqn_lock);
 156                 kfree(tiqn);
 157                 return ERR_PTR(ret);
 158         }
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160         spin_unlock(&tiqn_lock);
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         if (np->np_login_tpg) {
 219                 pr_err("np->np_login_tpg() is not NULL!\n");
 220                 spin_unlock_bh(&np->np_thread_lock);
 221                 return -1;
 222         }
 223         spin_unlock_bh(&np->np_thread_lock);
 224         /*
 225          * Determine if the portal group is accepting storage traffic.
 226          */
 227         spin_lock_bh(&tpg->tpg_state_lock);
 228         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 229                 spin_unlock_bh(&tpg->tpg_state_lock);
 230                 return -1;
 231         }
 232         spin_unlock_bh(&tpg->tpg_state_lock);
 233
 234         /*
 235          * Here we serialize access across the TIQN+TPG Tuple.
 236          */
 237         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 238         if ((ret != 0) || signal_pending(current))
 239                 return -1;
 240
 241         spin_lock_bh(&np->np_thread_lock);
 242         np->np_login_tpg = tpg;
 243         spin_unlock_bh(&np->np_thread_lock);
 244
 245         return 0;
 246 }
 247
 248 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 249 {
 250         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 251
 252         spin_lock_bh(&np->np_thread_lock);
 253         np->np_login_tpg = NULL;
 254         spin_unlock_bh(&np->np_thread_lock);
 255
 256         mutex_unlock(&tpg->np_login_lock);
 257
 258         if (tiqn)
 259                 iscsit_put_tiqn_for_login(tiqn);
 260
 261         return 0;
 262 }
 263
 264 static struct iscsi_np *iscsit_get_np(
 265         struct __kernel_sockaddr_storage *sockaddr,
 266         int network_transport)
 267 {
 268         struct sockaddr_in *sock_in, *sock_in_e;
 269         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 270         struct iscsi_np *np;
 271         int ip_match = 0;
 272         u16 port;
 273
 274         spin_lock_bh(&np_lock);
 275         list_for_each_entry(np, &g_np_list, np_list) {
 276                 spin_lock(&np->np_thread_lock);
 277                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 278                         spin_unlock(&np->np_thread_lock);
 279                         continue;
 280                 }
 281
 282                 if (sockaddr->ss_family == AF_INET6) {
 283                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                         if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                                     &sock_in6_e->sin6_addr.in6_u,
 288                                     sizeof(struct in6_addr)))
 289                                 ip_match = 1;
 290
 291                         port = ntohs(sock_in6->sin6_port);
 292                 } else {
 293                         sock_in = (struct sockaddr_in *)sockaddr;
 294                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                         if (sock_in->sin_addr.s_addr ==
 297                             sock_in_e->sin_addr.s_addr)
 298                                 ip_match = 1;
 299
 300                         port = ntohs(sock_in->sin_port);
 301                 }
 302
 303                 if ((ip_match == 1) && (np->np_port == port) &&
 304                     (np->np_network_transport == network_transport)) {
 305                         /*
 306                          * Increment the np_exports reference count now to
 307                          * prevent iscsit_del_np() below from being called
 308                          * while iscsi_tpg_add_network_portal() is called.
 309                          */
 310                         np->np_exports++;
 311                         spin_unlock(&np->np_thread_lock);
 312                         spin_unlock_bh(&np_lock);
 313                         return np;
 314                 }
 315                 spin_unlock(&np->np_thread_lock);
 316         }
 317         spin_unlock_bh(&np_lock);
 318
 319         return NULL;
 320 }
 321
 322 struct iscsi_np *iscsit_add_np(
 323         struct __kernel_sockaddr_storage *sockaddr,
 324         char *ip_str,
 325         int network_transport)
 326 {
 327         struct sockaddr_in *sock_in;
 328         struct sockaddr_in6 *sock_in6;
 329         struct iscsi_np *np;
 330         int ret;
 331         /*
 332          * Locate the existing struct iscsi_np if already active..
 333          */
 334         np = iscsit_get_np(sockaddr, network_transport);
 335         if (np)
 336                 return np;
 337
 338         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 339         if (!np) {
 340                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 341                 return ERR_PTR(-ENOMEM);
 342         }
 343
 344         np->np_flags |= NPF_IP_NETWORK;
 345         if (sockaddr->ss_family == AF_INET6) {
 346                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 347                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 348                 np->np_port = ntohs(sock_in6->sin6_port);
 349         } else {
 350                 sock_in = (struct sockaddr_in *)sockaddr;
 351                 sprintf(np->np_ip, "%s", ip_str);
 352                 np->np_port = ntohs(sock_in->sin_port);
 353         }
 354
 355         np->np_network_transport = network_transport;
 356         spin_lock_init(&np->np_thread_lock);
 357         init_completion(&np->np_restart_comp);
 358         INIT_LIST_HEAD(&np->np_list);
 359
 360         ret = iscsi_target_setup_login_socket(np, sockaddr);
 361         if (ret != 0) {
 362                 kfree(np);
 363                 return ERR_PTR(ret);
 364         }
 365
 366         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 367         if (IS_ERR(np->np_thread)) {
 368                 pr_err("Unable to create kthread: iscsi_np\n");
 369                 ret = PTR_ERR(np->np_thread);
 370                 kfree(np);
 371                 return ERR_PTR(ret);
 372         }
 373         /*
 374          * Increment the np_exports reference count now to prevent
 375          * iscsit_del_np() below from being run while a new call to
 376          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 377          * active.  We don't need to hold np->np_thread_lock at this
 378          * point because iscsi_np has not been added to g_np_list yet.
 379          */
 380         np->np_exports = 1;
 381
 382         spin_lock_bh(&np_lock);
 383         list_add_tail(&np->np_list, &g_np_list);
 384         spin_unlock_bh(&np_lock);
 385
 386         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 387                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 388                 "TCP" : "SCTP");
 389
 390         return np;
 391 }
 392
 393 int iscsit_reset_np_thread(
 394         struct iscsi_np *np,
 395         struct iscsi_tpg_np *tpg_np,
 396         struct iscsi_portal_group *tpg)
 397 {
 398         spin_lock_bh(&np->np_thread_lock);
 399         if (tpg && tpg_np) {
 400                 /*
 401                  * The reset operation need only be performed when the
 402                  * passed struct iscsi_portal_group has a login in progress
 403                  * to one of the network portals.
 404                  */
 405                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 406                         spin_unlock_bh(&np->np_thread_lock);
 407                         return 0;
 408                 }
 409         }
 410         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 411                 spin_unlock_bh(&np->np_thread_lock);
 412                 return 0;
 413         }
 414         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 415
 416         if (np->np_thread) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 send_sig(SIGINT, np->np_thread, 1);
 419                 wait_for_completion(&np->np_restart_comp);
 420                 spin_lock_bh(&np->np_thread_lock);
 421         }
 422         spin_unlock_bh(&np->np_thread_lock);
 423
 424         return 0;
 425 }
 426
 427 int iscsit_del_np_comm(struct iscsi_np *np)
 428 {
 429         if (!np->np_socket)
 430                 return 0;
 431
 432         /*
 433          * Some network transports allocate their own struct sock->file,
 434          * see  if we need to free any additional allocated resources.
 435          */
 436         if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 437                 kfree(np->np_socket->file);
 438                 np->np_socket->file = NULL;
 439         }
 440
 441         sock_release(np->np_socket);
 442         return 0;
 443 }
 444
 445 int iscsit_del_np(struct iscsi_np *np)
 446 {
 447         spin_lock_bh(&np->np_thread_lock);
 448         np->np_exports--;
 449         if (np->np_exports) {
 450                 spin_unlock_bh(&np->np_thread_lock);
 451                 return 0;
 452         }
 453         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 454         spin_unlock_bh(&np->np_thread_lock);
 455
 456         if (np->np_thread) {
 457                 /*
 458                  * We need to send the signal to wakeup Linux/Net
 459                  * which may be sleeping in sock_accept()..
 460                  */
 461                 send_sig(SIGINT, np->np_thread, 1);
 462                 kthread_stop(np->np_thread);
 463         }
 464         iscsit_del_np_comm(np);
 465
 466         spin_lock_bh(&np_lock);
 467         list_del(&np->np_list);
 468         spin_unlock_bh(&np_lock);
 469
 470         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 471                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 472                 "TCP" : "SCTP");
 473
 474         kfree(np);
 475         return 0;
 476 }
 477
 478 static int __init iscsi_target_init_module(void)
 479 {
 480         int ret = 0;
 481
 482         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 483
 484         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 485         if (!iscsit_global) {
 486                 pr_err("Unable to allocate memory for iscsit_global\n");
 487                 return -1;
 488         }
 489         mutex_init(&auth_id_lock);
 490         spin_lock_init(&sess_idr_lock);
 491         idr_init(&tiqn_idr);
 492         idr_init(&sess_idr);
 493
 494         ret = iscsi_target_register_configfs();
 495         if (ret < 0)
 496                 goto out;
 497
 498         ret = iscsi_thread_set_init();
 499         if (ret < 0)
 500                 goto configfs_out;
 501
 502         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 503                         TARGET_THREAD_SET_COUNT) {
 504                 pr_err("iscsi_allocate_thread_sets() returned"
 505                         " unexpected value!\n");
 506                 goto ts_out1;
 507         }
 508
 509         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 510                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 511                         0, NULL);
 512         if (!lio_cmd_cache) {
 513                 pr_err("Unable to kmem_cache_create() for"
 514                                 " lio_cmd_cache\n");
 515                 goto ts_out2;
 516         }
 517
 518         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 519                         sizeof(struct iscsi_queue_req),
 520                         __alignof__(struct iscsi_queue_req), 0, NULL);
 521         if (!lio_qr_cache) {
 522                 pr_err("nable to kmem_cache_create() for"
 523                                 " lio_qr_cache\n");
 524                 goto cmd_out;
 525         }
 526
 527         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 528                         sizeof(struct iscsi_datain_req),
 529                         __alignof__(struct iscsi_datain_req), 0, NULL);
 530         if (!lio_dr_cache) {
 531                 pr_err("Unable to kmem_cache_create() for"
 532                                 " lio_dr_cache\n");
 533                 goto qr_out;
 534         }
 535
 536         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 537                         sizeof(struct iscsi_ooo_cmdsn),
 538                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 539         if (!lio_ooo_cache) {
 540                 pr_err("Unable to kmem_cache_create() for"
 541                                 " lio_ooo_cache\n");
 542                 goto dr_out;
 543         }
 544
 545         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 546                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 547                         0, NULL);
 548         if (!lio_r2t_cache) {
 549                 pr_err("Unable to kmem_cache_create() for"
 550                                 " lio_r2t_cache\n");
 551                 goto ooo_out;
 552         }
 553
 554         if (iscsit_load_discovery_tpg() < 0)
 555                 goto r2t_out;
 556
 557         return ret;
 558 r2t_out:
 559         kmem_cache_destroy(lio_r2t_cache);
 560 ooo_out:
 561         kmem_cache_destroy(lio_ooo_cache);
 562 dr_out:
 563         kmem_cache_destroy(lio_dr_cache);
 564 qr_out:
 565         kmem_cache_destroy(lio_qr_cache);
 566 cmd_out:
 567         kmem_cache_destroy(lio_cmd_cache);
 568 ts_out2:
 569         iscsi_deallocate_thread_sets();
 570 ts_out1:
 571         iscsi_thread_set_free();
 572 configfs_out:
 573         iscsi_target_deregister_configfs();
 574 out:
 575         kfree(iscsit_global);
 576         return -ENOMEM;
 577 }
 578
 579 static void __exit iscsi_target_cleanup_module(void)
 580 {
 581         iscsi_deallocate_thread_sets();
 582         iscsi_thread_set_free();
 583         iscsit_release_discovery_tpg();
 584         kmem_cache_destroy(lio_cmd_cache);
 585         kmem_cache_destroy(lio_qr_cache);
 586         kmem_cache_destroy(lio_dr_cache);
 587         kmem_cache_destroy(lio_ooo_cache);
 588         kmem_cache_destroy(lio_r2t_cache);
 589
 590         iscsi_target_deregister_configfs();
 591
 592         kfree(iscsit_global);
 593 }
 594
 595 int iscsit_add_reject(
 596         u8 reason,
 597         int fail_conn,
 598         unsigned char *buf,
 599         struct iscsi_conn *conn)
 600 {
 601         struct iscsi_cmd *cmd;
 602         struct iscsi_reject *hdr;
 603         int ret;
 604
 605         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 606         if (!cmd)
 607                 return -1;
 608
 609         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 610         if (fail_conn)
 611                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 612
 613         hdr     = (struct iscsi_reject *) cmd->pdu;
 614         hdr->reason = reason;
 615
 616         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 617         if (!cmd->buf_ptr) {
 618                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 619                 iscsit_release_cmd(cmd);
 620                 return -1;
 621         }
 622
 623         spin_lock_bh(&conn->cmd_lock);
 624         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 625         spin_unlock_bh(&conn->cmd_lock);
 626
 627         cmd->i_state = ISTATE_SEND_REJECT;
 628         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 629
 630         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 631         if (ret != 0)
 632                 return -1;
 633
 634         return (!fail_conn) ? 0 : -1;
 635 }
 636
 637 int iscsit_add_reject_from_cmd(
 638         u8 reason,
 639         int fail_conn,
 640         int add_to_conn,
 641         unsigned char *buf,
 642         struct iscsi_cmd *cmd)
 643 {
 644         struct iscsi_conn *conn;
 645         struct iscsi_reject *hdr;
 646         int ret;
 647
 648         if (!cmd->conn) {
 649                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 650                                 cmd->init_task_tag);
 651                 return -1;
 652         }
 653         conn = cmd->conn;
 654
 655         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 656         if (fail_conn)
 657                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 658
 659         hdr     = (struct iscsi_reject *) cmd->pdu;
 660         hdr->reason = reason;
 661
 662         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 663         if (!cmd->buf_ptr) {
 664                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 665                 iscsit_release_cmd(cmd);
 666                 return -1;
 667         }
 668
 669         if (add_to_conn) {
 670                 spin_lock_bh(&conn->cmd_lock);
 671                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 672                 spin_unlock_bh(&conn->cmd_lock);
 673         }
 674
 675         cmd->i_state = ISTATE_SEND_REJECT;
 676         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 677
 678         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 679         if (ret != 0)
 680                 return -1;
 681
 682         return (!fail_conn) ? 0 : -1;
 683 }
 684
 685 /*
 686  * Map some portion of the allocated scatterlist to an iovec, suitable for
 687  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 688  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 689  * either case (see iscsit_alloc_buffs)
 690  */
 691 static int iscsit_map_iovec(
 692         struct iscsi_cmd *cmd,
 693         struct kvec *iov,
 694         u32 data_offset,
 695         u32 data_length)
 696 {
 697         u32 i = 0;
 698         struct scatterlist *sg;
 699         unsigned int page_off;
 700
 701         /*
 702          * We have a private mapping of the allocated pages in t_mem_sg.
 703          * At this point, we also know each contains a page.
 704          */
 705         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 706         page_off = (data_offset % PAGE_SIZE);
 707
 708         cmd->first_data_sg = sg;
 709         cmd->first_data_sg_off = page_off;
 710
 711         while (data_length) {
 712                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 713
 714                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 715                 iov[i].iov_len = cur_len;
 716
 717                 data_length -= cur_len;
 718                 page_off = 0;
 719                 sg = sg_next(sg);
 720                 i++;
 721         }
 722
 723         cmd->kmapped_nents = i;
 724
 725         return i;
 726 }
 727
 728 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 729 {
 730         u32 i;
 731         struct scatterlist *sg;
 732
 733         sg = cmd->first_data_sg;
 734
 735         for (i = 0; i < cmd->kmapped_nents; i++)
 736                 kunmap(sg_page(&sg[i]));
 737 }
 738
 739 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 740 {
 741         struct iscsi_cmd *cmd;
 742
 743         conn->exp_statsn = exp_statsn;
 744
 745         spin_lock_bh(&conn->cmd_lock);
 746         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
 747                 spin_lock(&cmd->istate_lock);
 748                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 749                     (cmd->stat_sn < exp_statsn)) {
 750                         cmd->i_state = ISTATE_REMOVE;
 751                         spin_unlock(&cmd->istate_lock);
 752                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 753                                                 cmd->i_state);
 754                         continue;
 755                 }
 756                 spin_unlock(&cmd->istate_lock);
 757         }
 758         spin_unlock_bh(&conn->cmd_lock);
 759 }
 760
 761 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 762 {
 763         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 764                                 cmd->se_cmd.t_data_nents;
 765
 766         iov_count += ISCSI_IOV_DATA_BUFFER;
 767
 768         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 769         if (!cmd->iov_data) {
 770                 pr_err("Unable to allocate cmd->iov_data\n");
 771                 return -ENOMEM;
 772         }
 773
 774         cmd->orig_iov_data_count = iov_count;
 775         return 0;
 776 }
 777
 778 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 779 {
 780         struct scatterlist *sgl;
 781         u32 length = cmd->se_cmd.data_length;
 782         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 783         int i = 0, j = 0, ret;
 784         /*
 785          * If no SCSI payload is present, allocate the default iovecs used for
 786          * iSCSI PDU Header
 787          */
 788         if (!length)
 789                 return iscsit_allocate_iovecs(cmd);
 790
 791         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 792         if (!sgl)
 793                 return -ENOMEM;
 794
 795         sg_init_table(sgl, nents);
 796
 797         while (length) {
 798                 int buf_size = min_t(int, length, PAGE_SIZE);
 799                 struct page *page;
 800
 801                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 802                 if (!page)
 803                         goto page_alloc_failed;
 804
 805                 sg_set_page(&sgl[i], page, buf_size, 0);
 806
 807                 length -= buf_size;
 808                 i++;
 809         }
 810
 811         cmd->t_mem_sg = sgl;
 812         cmd->t_mem_sg_nents = nents;
 813
 814         /* BIDI ops not supported */
 815
 816         /* Tell the core about our preallocated memory */
 817         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 818         /*
 819          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 820          * so that cmd->se_cmd.t_tasks_se_num has been set.
 821          */
 822         ret = iscsit_allocate_iovecs(cmd);
 823         if (ret < 0)
 824                 return -ENOMEM;
 825
 826         return 0;
 827
 828 page_alloc_failed:
 829         while (j < i)
 830                 __free_page(sg_page(&sgl[j++]));
 831
 832         kfree(sgl);
 833         return -ENOMEM;
 834 }
 835
 836 static int iscsit_handle_scsi_cmd(
 837         struct iscsi_conn *conn,
 838         unsigned char *buf)
 839 {
 840         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 841         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 842         struct iscsi_cmd        *cmd = NULL;
 843         struct iscsi_scsi_req *hdr;
 844
 845         spin_lock_bh(&conn->sess->session_stats_lock);
 846         conn->sess->cmd_pdus++;
 847         if (conn->sess->se_sess->se_node_acl) {
 848                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 849                 conn->sess->se_sess->se_node_acl->num_cmds++;
 850                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 851         }
 852         spin_unlock_bh(&conn->sess->session_stats_lock);
 853
 854         hdr                     = (struct iscsi_scsi_req *) buf;
 855         payload_length          = ntoh24(hdr->dlength);
 856         hdr->itt                = be32_to_cpu(hdr->itt);
 857         hdr->data_length        = be32_to_cpu(hdr->data_length);
 858         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 859         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 860
 861         /* FIXME; Add checks for AdditionalHeaderSegment */
 862
 863         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 864             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 865                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 866                                 " not set. Bad iSCSI Initiator.\n");
 867                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 868                                 buf, conn);
 869         }
 870
 871         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 872              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 873                 /*
 874                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 875                  * that adds support for RESERVE/RELEASE.  There is a bug
 876                  * add with this new functionality that sets R/W bits when
 877                  * neither CDB carries any READ or WRITE datapayloads.
 878                  */
 879                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 880                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 881                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 882                         goto done;
 883                 }
 884
 885                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 886                         " set when Expected Data Transfer Length is 0 for"
 887                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 888                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 889                                 buf, conn);
 890         }
 891 done:
 892
 893         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 894             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 895                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 896                         " MUST be set if Expected Data Transfer Length is not 0."
 897                         " Bad iSCSI Initiator\n");
 898                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 899                                 buf, conn);
 900         }
 901
 902         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 903             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 904                 pr_err("Bidirectional operations not supported!\n");
 905                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 906                                 buf, conn);
 907         }
 908
 909         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 910                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 911                                 " Scsi Command PDU.\n");
 912                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 913                                 buf, conn);
 914         }
 915
 916         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 917                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 918                         " protocol error.\n", payload_length);
 919                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 920                                 buf, conn);
 921         }
 922
 923         if ((hdr->data_length == payload_length) &&
 924             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 925                 pr_err("Expected Data Transfer Length and Length of"
 926                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 927                         " bit is not set protocol error\n");
 928                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 929                                 buf, conn);
 930         }
 931
 932         if (payload_length > hdr->data_length) {
 933                 pr_err("DataSegmentLength: %u is greater than"
 934                         " EDTL: %u, protocol error.\n", payload_length,
 935                                 hdr->data_length);
 936                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 937                                 buf, conn);
 938         }
 939
 940         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 941                 pr_err("DataSegmentLength: %u is greater than"
 942                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 943                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 944                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 945                                 buf, conn);
 946         }
 947
 948         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 949                 pr_err("DataSegmentLength: %u is greater than"
 950                         " FirstBurstLength: %u, protocol error.\n",
 951                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 952                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 953                                         buf, conn);
 954         }
 955
 956         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 957                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 958                           DMA_NONE;
 959
 960         cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
 961                                 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
 962         if (!cmd)
 963                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 964                                         buf, conn);
 965
 966         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 967                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 968                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 969
 970         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 971         cmd->i_state            = ISTATE_NEW_CMD;
 972         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 973         cmd->immediate_data     = (payload_length) ? 1 : 0;
 974         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 975                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 976         if (cmd->unsolicited_data)
 977                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 978
 979         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 980         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 981                 spin_lock_bh(&conn->sess->ttt_lock);
 982                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 983                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 984                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 985                 spin_unlock_bh(&conn->sess->ttt_lock);
 986         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 987                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 988         cmd->cmd_sn             = hdr->cmdsn;
 989         cmd->exp_stat_sn        = hdr->exp_statsn;
 990         cmd->first_burst_len    = payload_length;
 991
 992         if (cmd->data_direction == DMA_FROM_DEVICE) {
 993                 struct iscsi_datain_req *dr;
 994
 995                 dr = iscsit_allocate_datain_req();
 996                 if (!dr)
 997                         return iscsit_add_reject_from_cmd(
 998                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 999                                         1, 1, buf, cmd);
1000
1001                 iscsit_attach_datain_req(cmd, dr);
1002         }
1003
1004         /*
1005          * The CDB is going to an se_device_t.
1006          */
1007         ret = transport_lookup_cmd_lun(&cmd->se_cmd,
1008                                        scsilun_to_int(&hdr->lun));
1009         if (ret < 0) {
1010                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1011                         pr_debug("Responding to non-acl'ed,"
1012                                 " non-existent or non-exported iSCSI LUN:"
1013                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1014                 }
1015                 send_check_condition = 1;
1016                 goto attach_cmd;
1017         }
1018         /*
1019          * The Initiator Node has access to the LUN (the addressing method
1020          * is handled inside of iscsit_get_lun_for_cmd()).  Now it's time to
1021          * allocate 1->N transport tasks (depending on sector count and
1022          * maximum request size the physical HBA(s) can handle.
1023          */
1024         transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1025         if (transport_ret == -ENOMEM) {
1026                 return iscsit_add_reject_from_cmd(
1027                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1028                                 1, 1, buf, cmd);
1029         } else if (transport_ret == -EINVAL) {
1030                 /*
1031                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1032                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1033                  * Mechinism.
1034                  */
1035                 send_check_condition = 1;
1036         } else {
1037                 cmd->data_length = cmd->se_cmd.data_length;
1038
1039                 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1040                         return iscsit_add_reject_from_cmd(
1041                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1042                                 1, 1, buf, cmd);
1043         }
1044
1045 attach_cmd:
1046         spin_lock_bh(&conn->cmd_lock);
1047         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1048         spin_unlock_bh(&conn->cmd_lock);
1049         /*
1050          * Check if we need to delay processing because of ALUA
1051          * Active/NonOptimized primary access state..
1052          */
1053         core_alua_check_nonop_delay(&cmd->se_cmd);
1054         /*
1055          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1056          * also call iscsit_allocate_iovecs()
1057          */
1058         ret = iscsit_alloc_buffs(cmd);
1059         if (ret < 0)
1060                 return iscsit_add_reject_from_cmd(
1061                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1062                                 1, 0, buf, cmd);
1063         /*
1064          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1065          * the Immediate Bit is not set, and no Immediate
1066          * Data is attached.
1067          *
1068          * A PDU/CmdSN carrying Immediate Data can only
1069          * be processed after the DataCRC has passed.
1070          * If the DataCRC fails, the CmdSN MUST NOT
1071          * be acknowledged. (See below)
1072          */
1073         if (!cmd->immediate_data) {
1074                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1075                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1076                         return 0;
1077                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1078                         return iscsit_add_reject_from_cmd(
1079                                 ISCSI_REASON_PROTOCOL_ERROR,
1080                                 1, 0, buf, cmd);
1081         }
1082
1083         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1084
1085         /*
1086          * If no Immediate Data is attached, it's OK to return now.
1087          */
1088         if (!cmd->immediate_data) {
1089                 if (send_check_condition)
1090                         return 0;
1091
1092                 if (cmd->unsolicited_data) {
1093                         iscsit_set_dataout_sequence_values(cmd);
1094
1095                         spin_lock_bh(&cmd->dataout_timeout_lock);
1096                         iscsit_start_dataout_timer(cmd, cmd->conn);
1097                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1098                 }
1099
1100                 return 0;
1101         }
1102
1103         /*
1104          * Early CHECK_CONDITIONs never make it to the transport processing
1105          * thread.  They are processed in CmdSN order by
1106          * iscsit_check_received_cmdsn() below.
1107          */
1108         if (send_check_condition) {
1109                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1110                 dump_immediate_data = 1;
1111                 goto after_immediate_data;
1112         }
1113         /*
1114          * Call directly into transport_generic_new_cmd() to perform
1115          * the backend memory allocation.
1116          */
1117         ret = transport_generic_new_cmd(&cmd->se_cmd);
1118         if (ret < 0) {
1119                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1120                 dump_immediate_data = 1;
1121                 goto after_immediate_data;
1122         }
1123
1124         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1125 after_immediate_data:
1126         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1127                 /*
1128                  * A PDU/CmdSN carrying Immediate Data passed
1129                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1130                  * Immediate Bit is not set.
1131                  */
1132                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1133                 /*
1134                  * Special case for Unsupported SAM WRITE Opcodes
1135                  * and ImmediateData=Yes.
1136                  */
1137                 if (dump_immediate_data) {
1138                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1139                                 return -1;
1140                 } else if (cmd->unsolicited_data) {
1141                         iscsit_set_dataout_sequence_values(cmd);
1142
1143                         spin_lock_bh(&cmd->dataout_timeout_lock);
1144                         iscsit_start_dataout_timer(cmd, cmd->conn);
1145                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1146                 }
1147
1148                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1149                         return iscsit_add_reject_from_cmd(
1150                                 ISCSI_REASON_PROTOCOL_ERROR,
1151                                 1, 0, buf, cmd);
1152
1153         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1154                 /*
1155                  * Immediate Data failed DataCRC and ERL>=1,
1156                  * silently drop this PDU and let the initiator
1157                  * plug the CmdSN gap.
1158                  *
1159                  * FIXME: Send Unsolicited NOPIN with reserved
1160                  * TTT here to help the initiator figure out
1161                  * the missing CmdSN, although they should be
1162                  * intelligent enough to determine the missing
1163                  * CmdSN and issue a retry to plug the sequence.
1164                  */
1165                 cmd->i_state = ISTATE_REMOVE;
1166                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1167         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1168                 return -1;
1169
1170         return 0;
1171 }
1172
1173 static u32 iscsit_do_crypto_hash_sg(
1174         struct hash_desc *hash,
1175         struct iscsi_cmd *cmd,
1176         u32 data_offset,
1177         u32 data_length,
1178         u32 padding,
1179         u8 *pad_bytes)
1180 {
1181         u32 data_crc;
1182         u32 i;
1183         struct scatterlist *sg;
1184         unsigned int page_off;
1185
1186         crypto_hash_init(hash);
1187
1188         sg = cmd->first_data_sg;
1189         page_off = cmd->first_data_sg_off;
1190
1191         i = 0;
1192         while (data_length) {
1193                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1194
1195                 crypto_hash_update(hash, &sg[i], cur_len);
1196
1197                 data_length -= cur_len;
1198                 page_off = 0;
1199                 i++;
1200         }
1201
1202         if (padding) {
1203                 struct scatterlist pad_sg;
1204
1205                 sg_init_one(&pad_sg, pad_bytes, padding);
1206                 crypto_hash_update(hash, &pad_sg, padding);
1207         }
1208         crypto_hash_final(hash, (u8 *) &data_crc);
1209
1210         return data_crc;
1211 }
1212
1213 static void iscsit_do_crypto_hash_buf(
1214         struct hash_desc *hash,
1215         unsigned char *buf,
1216         u32 payload_length,
1217         u32 padding,
1218         u8 *pad_bytes,
1219         u8 *data_crc)
1220 {
1221         struct scatterlist sg;
1222
1223         crypto_hash_init(hash);
1224
1225         sg_init_one(&sg, buf, payload_length);
1226         crypto_hash_update(hash, &sg, payload_length);
1227
1228         if (padding) {
1229                 sg_init_one(&sg, pad_bytes, padding);
1230                 crypto_hash_update(hash, &sg, padding);
1231         }
1232         crypto_hash_final(hash, data_crc);
1233 }
1234
1235 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1236 {
1237         int iov_ret, ooo_cmdsn = 0, ret;
1238         u8 data_crc_failed = 0;
1239         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1240         u32 rx_size = 0, payload_length;
1241         struct iscsi_cmd *cmd = NULL;
1242         struct se_cmd *se_cmd;
1243         struct iscsi_data *hdr;
1244         struct kvec *iov;
1245         unsigned long flags;
1246
1247         hdr                     = (struct iscsi_data *) buf;
1248         payload_length          = ntoh24(hdr->dlength);
1249         hdr->itt                = be32_to_cpu(hdr->itt);
1250         hdr->ttt                = be32_to_cpu(hdr->ttt);
1251         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1252         hdr->datasn             = be32_to_cpu(hdr->datasn);
1253         hdr->offset             = be32_to_cpu(hdr->offset);
1254
1255         if (!payload_length) {
1256                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1257                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1258                                         buf, conn);
1259         }
1260
1261         /* iSCSI write */
1262         spin_lock_bh(&conn->sess->session_stats_lock);
1263         conn->sess->rx_data_octets += payload_length;
1264         if (conn->sess->se_sess->se_node_acl) {
1265                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1266                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1267                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1268         }
1269         spin_unlock_bh(&conn->sess->session_stats_lock);
1270
1271         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1272                 pr_err("DataSegmentLength: %u is greater than"
1273                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1274                         conn->conn_ops->MaxRecvDataSegmentLength);
1275                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1276                                         buf, conn);
1277         }
1278
1279         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1280                         payload_length);
1281         if (!cmd)
1282                 return 0;
1283
1284         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1285                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1286                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1287                 payload_length, conn->cid);
1288
1289         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1290                 pr_err("Command ITT: 0x%08x received DataOUT after"
1291                         " last DataOUT received, dumping payload\n",
1292                         cmd->init_task_tag);
1293                 return iscsit_dump_data_payload(conn, payload_length, 1);
1294         }
1295
1296         if (cmd->data_direction != DMA_TO_DEVICE) {
1297                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1298                         " NON-WRITE command.\n", cmd->init_task_tag);
1299                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1300                                 1, 0, buf, cmd);
1301         }
1302         se_cmd = &cmd->se_cmd;
1303         iscsit_mod_dataout_timer(cmd);
1304
1305         if ((hdr->offset + payload_length) > cmd->data_length) {
1306                 pr_err("DataOut Offset: %u, Length %u greater than"
1307                         " iSCSI Command EDTL %u, protocol error.\n",
1308                         hdr->offset, payload_length, cmd->data_length);
1309                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1310                                 1, 0, buf, cmd);
1311         }
1312
1313         if (cmd->unsolicited_data) {
1314                 int dump_unsolicited_data = 0;
1315
1316                 if (conn->sess->sess_ops->InitialR2T) {
1317                         pr_err("Received unexpected unsolicited data"
1318                                 " while InitialR2T=Yes, protocol error.\n");
1319                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1320                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1321                         return -1;
1322                 }
1323                 /*
1324                  * Special case for dealing with Unsolicited DataOUT
1325                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1326                  * failures;
1327                  */
1328
1329                 /* Something's amiss if we're not in WRITE_PENDING state... */
1330                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1331                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1332                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1333
1334                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1335                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1336                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1337                         dump_unsolicited_data = 1;
1338                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1339
1340                 if (dump_unsolicited_data) {
1341                         /*
1342                          * Check if a delayed TASK_ABORTED status needs to
1343                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1344                          * received with the unsolicitied data out.
1345                          */
1346                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1347                                 iscsit_stop_dataout_timer(cmd);
1348
1349                         transport_check_aborted_status(se_cmd,
1350                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1351                         return iscsit_dump_data_payload(conn, payload_length, 1);
1352                 }
1353         } else {
1354                 /*
1355                  * For the normal solicited data path:
1356                  *
1357                  * Check for a delayed TASK_ABORTED status and dump any
1358                  * incoming data out payload if one exists.  Also, when the
1359                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1360                  * data out sequence, we decrement outstanding_r2ts.  Once
1361                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1362                  * TASK_ABORTED status.
1363                  */
1364                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1365                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1366                                 if (--cmd->outstanding_r2ts < 1) {
1367                                         iscsit_stop_dataout_timer(cmd);
1368                                         transport_check_aborted_status(
1369                                                         se_cmd, 1);
1370                                 }
1371
1372                         return iscsit_dump_data_payload(conn, payload_length, 1);
1373                 }
1374         }
1375         /*
1376          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1377          * within-command recovery checks before receiving the payload.
1378          */
1379         ret = iscsit_check_pre_dataout(cmd, buf);
1380         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1381                 return 0;
1382         else if (ret == DATAOUT_CANNOT_RECOVER)
1383                 return -1;
1384
1385         rx_size += payload_length;
1386         iov = &cmd->iov_data[0];
1387
1388         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1389         if (iov_ret < 0)
1390                 return -1;
1391
1392         iov_count += iov_ret;
1393
1394         padding = ((-payload_length) & 3);
1395         if (padding != 0) {
1396                 iov[iov_count].iov_base = cmd->pad_bytes;
1397                 iov[iov_count++].iov_len = padding;
1398                 rx_size += padding;
1399                 pr_debug("Receiving %u padding bytes.\n", padding);
1400         }
1401
1402         if (conn->conn_ops->DataDigest) {
1403                 iov[iov_count].iov_base = &checksum;
1404                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1405                 rx_size += ISCSI_CRC_LEN;
1406         }
1407
1408         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1409
1410         iscsit_unmap_iovec(cmd);
1411
1412         if (rx_got != rx_size)
1413                 return -1;
1414
1415         if (conn->conn_ops->DataDigest) {
1416                 u32 data_crc;
1417
1418                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1419                                                     hdr->offset, payload_length, padding,
1420                                                     cmd->pad_bytes);
1421
1422                 if (checksum != data_crc) {
1423                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1424                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1425                                 " does not match computed 0x%08x\n",
1426                                 hdr->itt, hdr->offset, payload_length,
1427                                 hdr->datasn, checksum, data_crc);
1428                         data_crc_failed = 1;
1429                 } else {
1430                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1431                                 " %u bytes of Data Out\n", checksum,
1432                                 payload_length);
1433                 }
1434         }
1435         /*
1436          * Increment post receive data and CRC values or perform
1437          * within-command recovery.
1438          */
1439         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1440         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1441                 return 0;
1442         else if (ret == DATAOUT_SEND_R2T) {
1443                 iscsit_set_dataout_sequence_values(cmd);
1444                 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1445         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1446                 /*
1447                  * Handle extra special case for out of order
1448                  * Unsolicited Data Out.
1449                  */
1450                 spin_lock_bh(&cmd->istate_lock);
1451                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1452                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1453                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1454                 spin_unlock_bh(&cmd->istate_lock);
1455
1456                 iscsit_stop_dataout_timer(cmd);
1457                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1458                                         &cmd->se_cmd) : 0;
1459         } else /* DATAOUT_CANNOT_RECOVER */
1460                 return -1;
1461
1462         return 0;
1463 }
1464
1465 static int iscsit_handle_nop_out(
1466         struct iscsi_conn *conn,
1467         unsigned char *buf)
1468 {
1469         unsigned char *ping_data = NULL;
1470         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1471         u32 checksum, data_crc, padding = 0, payload_length;
1472         u64 lun;
1473         struct iscsi_cmd *cmd = NULL;
1474         struct kvec *iov = NULL;
1475         struct iscsi_nopout *hdr;
1476
1477         hdr                     = (struct iscsi_nopout *) buf;
1478         payload_length          = ntoh24(hdr->dlength);
1479         lun                     = get_unaligned_le64(&hdr->lun);
1480         hdr->itt                = be32_to_cpu(hdr->itt);
1481         hdr->ttt                = be32_to_cpu(hdr->ttt);
1482         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1483         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1484
1485         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1486                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1487                         " not set, protocol error.\n");
1488                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1489                                         buf, conn);
1490         }
1491
1492         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1493                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1494                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1495                         " error.\n", payload_length,
1496                         conn->conn_ops->MaxRecvDataSegmentLength);
1497                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1498                                         buf, conn);
1499         }
1500
1501         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1502                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1503                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1504                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1505                 payload_length);
1506         /*
1507          * This is not a response to a Unsolicited NopIN, which means
1508          * it can either be a NOPOUT ping request (with a valid ITT),
1509          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1510          * Either way, make sure we allocate an struct iscsi_cmd, as both
1511          * can contain ping data.
1512          */
1513         if (hdr->ttt == 0xFFFFFFFF) {
1514                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1515                 if (!cmd)
1516                         return iscsit_add_reject(
1517                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1518                                         1, buf, conn);
1519
1520                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1521                 cmd->i_state            = ISTATE_SEND_NOPIN;
1522                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1523                                                 1 : 0);
1524                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1525                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1526                 cmd->cmd_sn             = hdr->cmdsn;
1527                 cmd->exp_stat_sn        = hdr->exp_statsn;
1528                 cmd->data_direction     = DMA_NONE;
1529         }
1530
1531         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1532                 rx_size = payload_length;
1533                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1534                 if (!ping_data) {
1535                         pr_err("Unable to allocate memory for"
1536                                 " NOPOUT ping data.\n");
1537                         ret = -1;
1538                         goto out;
1539                 }
1540
1541                 iov = &cmd->iov_misc[0];
1542                 iov[niov].iov_base      = ping_data;
1543                 iov[niov++].iov_len     = payload_length;
1544
1545                 padding = ((-payload_length) & 3);
1546                 if (padding != 0) {
1547                         pr_debug("Receiving %u additional bytes"
1548                                 " for padding.\n", padding);
1549                         iov[niov].iov_base      = &cmd->pad_bytes;
1550                         iov[niov++].iov_len     = padding;
1551                         rx_size += padding;
1552                 }
1553                 if (conn->conn_ops->DataDigest) {
1554                         iov[niov].iov_base      = &checksum;
1555                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1556                         rx_size += ISCSI_CRC_LEN;
1557                 }
1558
1559                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1560                 if (rx_got != rx_size) {
1561                         ret = -1;
1562                         goto out;
1563                 }
1564
1565                 if (conn->conn_ops->DataDigest) {
1566                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1567                                         ping_data, payload_length,
1568                                         padding, cmd->pad_bytes,
1569                                         (u8 *)&data_crc);
1570
1571                         if (checksum != data_crc) {
1572                                 pr_err("Ping data CRC32C DataDigest"
1573                                 " 0x%08x does not match computed 0x%08x\n",
1574                                         checksum, data_crc);
1575                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1576                                         pr_err("Unable to recover from"
1577                                         " NOPOUT Ping DataCRC failure while in"
1578                                                 " ERL=0.\n");
1579                                         ret = -1;
1580                                         goto out;
1581                                 } else {
1582                                         /*
1583                                          * Silently drop this PDU and let the
1584                                          * initiator plug the CmdSN gap.
1585                                          */
1586                                         pr_debug("Dropping NOPOUT"
1587                                         " Command CmdSN: 0x%08x due to"
1588                                         " DataCRC error.\n", hdr->cmdsn);
1589                                         ret = 0;
1590                                         goto out;
1591                                 }
1592                         } else {
1593                                 pr_debug("Got CRC32C DataDigest"
1594                                 " 0x%08x for %u bytes of ping data.\n",
1595                                         checksum, payload_length);
1596                         }
1597                 }
1598
1599                 ping_data[payload_length] = '\0';
1600                 /*
1601                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1602                  */
1603                 cmd->buf_ptr = ping_data;
1604                 cmd->buf_ptr_size = payload_length;
1605
1606                 pr_debug("Got %u bytes of NOPOUT ping"
1607                         " data.\n", payload_length);
1608                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1609         }
1610
1611         if (hdr->itt != 0xFFFFFFFF) {
1612                 if (!cmd) {
1613                         pr_err("Checking CmdSN for NOPOUT,"
1614                                 " but cmd is NULL!\n");
1615                         return -1;
1616                 }
1617                 /*
1618                  * Initiator is expecting a NopIN ping reply,
1619                  */
1620                 spin_lock_bh(&conn->cmd_lock);
1621                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1622                 spin_unlock_bh(&conn->cmd_lock);
1623
1624                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1625
1626                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1627                         iscsit_add_cmd_to_response_queue(cmd, conn,
1628                                         cmd->i_state);
1629                         return 0;
1630                 }
1631
1632                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1633                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1634                         ret = 0;
1635                         goto ping_out;
1636                 }
1637                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1638                         return iscsit_add_reject_from_cmd(
1639                                         ISCSI_REASON_PROTOCOL_ERROR,
1640                                         1, 0, buf, cmd);
1641
1642                 return 0;
1643         }
1644
1645         if (hdr->ttt != 0xFFFFFFFF) {
1646                 /*
1647                  * This was a response to a unsolicited NOPIN ping.
1648                  */
1649                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1650                 if (!cmd)
1651                         return -1;
1652
1653                 iscsit_stop_nopin_response_timer(conn);
1654
1655                 cmd->i_state = ISTATE_REMOVE;
1656                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1657                 iscsit_start_nopin_timer(conn);
1658         } else {
1659                 /*
1660                  * Initiator is not expecting a NOPIN is response.
1661                  * Just ignore for now.
1662                  *
1663                  * iSCSI v19-91 10.18
1664                  * "A NOP-OUT may also be used to confirm a changed
1665                  *  ExpStatSN if another PDU will not be available
1666                  *  for a long time."
1667                  */
1668                 ret = 0;
1669                 goto out;
1670         }
1671
1672         return 0;
1673 out:
1674         if (cmd)
1675                 iscsit_release_cmd(cmd);
1676 ping_out:
1677         kfree(ping_data);
1678         return ret;
1679 }
1680
1681 static int iscsit_handle_task_mgt_cmd(
1682         struct iscsi_conn *conn,
1683         unsigned char *buf)
1684 {
1685         struct iscsi_cmd *cmd;
1686         struct se_tmr_req *se_tmr;
1687         struct iscsi_tmr_req *tmr_req;
1688         struct iscsi_tm *hdr;
1689         u32 payload_length;
1690         int out_of_order_cmdsn = 0;
1691         int ret;
1692         u8 function;
1693
1694         hdr                     = (struct iscsi_tm *) buf;
1695         payload_length          = ntoh24(hdr->dlength);
1696         hdr->itt                = be32_to_cpu(hdr->itt);
1697         hdr->rtt                = be32_to_cpu(hdr->rtt);
1698         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1699         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1700         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1701         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1702         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1703         function = hdr->flags;
1704
1705         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1706                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1707                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1708                 hdr->rtt, hdr->refcmdsn, conn->cid);
1709
1710         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1711             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1712              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1713                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1714                 hdr->rtt = ISCSI_RESERVED_TAG;
1715         }
1716
1717         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1718                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1719                 pr_err("Task Management Request TASK_REASSIGN not"
1720                         " issued as immediate command, bad iSCSI Initiator"
1721                                 "implementation\n");
1722                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1723                                         buf, conn);
1724         }
1725         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1726             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1727                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1728
1729         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1730         if (!cmd)
1731                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1732                                         1, buf, conn);
1733
1734         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1735         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1736         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1737         cmd->init_task_tag      = hdr->itt;
1738         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1739         cmd->cmd_sn             = hdr->cmdsn;
1740         cmd->exp_stat_sn        = hdr->exp_statsn;
1741         se_tmr                  = cmd->se_cmd.se_tmr_req;
1742         tmr_req                 = cmd->tmr_req;
1743         /*
1744          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1745          */
1746         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1747                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1748                                                scsilun_to_int(&hdr->lun));
1749                 if (ret < 0) {
1750                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1751                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1752                         goto attach;
1753                 }
1754         }
1755
1756         switch (function) {
1757         case ISCSI_TM_FUNC_ABORT_TASK:
1758                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1759                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1760                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1761                         goto attach;
1762                 }
1763                 break;
1764         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1765         case ISCSI_TM_FUNC_CLEAR_ACA:
1766         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1767         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1768                 break;
1769         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1770                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1771                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1772                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1773                         goto attach;
1774                 }
1775                 break;
1776         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1777                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1778                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1779                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1780                         goto attach;
1781                 }
1782                 break;
1783         case ISCSI_TM_FUNC_TASK_REASSIGN:
1784                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1785                 /*
1786                  * Perform sanity checks on the ExpDataSN only if the
1787                  * TASK_REASSIGN was successful.
1788                  */
1789                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1790                         break;
1791
1792                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1793                         return iscsit_add_reject_from_cmd(
1794                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1795                                         buf, cmd);
1796                 break;
1797         default:
1798                 pr_err("Unknown TMR function: 0x%02x, protocol"
1799                         " error.\n", function);
1800                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1801                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1802                 goto attach;
1803         }
1804
1805         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1806             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1807                 se_tmr->call_transport = 1;
1808 attach:
1809         spin_lock_bh(&conn->cmd_lock);
1810         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1811         spin_unlock_bh(&conn->cmd_lock);
1812
1813         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1814                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1815                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1816                         out_of_order_cmdsn = 1;
1817                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1818                         return 0;
1819                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1820                         return iscsit_add_reject_from_cmd(
1821                                         ISCSI_REASON_PROTOCOL_ERROR,
1822                                         1, 0, buf, cmd);
1823         }
1824         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1825
1826         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1827                 return 0;
1828         /*
1829          * Found the referenced task, send to transport for processing.
1830          */
1831         if (se_tmr->call_transport)
1832                 return transport_generic_handle_tmr(&cmd->se_cmd);
1833
1834         /*
1835          * Could not find the referenced LUN, task, or Task Management
1836          * command not authorized or supported.  Change state and
1837          * let the tx_thread send the response.
1838          *
1839          * For connection recovery, this is also the default action for
1840          * TMR TASK_REASSIGN.
1841          */
1842         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1843         return 0;
1844 }
1845
1846 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1847 static int iscsit_handle_text_cmd(
1848         struct iscsi_conn *conn,
1849         unsigned char *buf)
1850 {
1851         char *text_ptr, *text_in;
1852         int cmdsn_ret, niov = 0, rx_got, rx_size;
1853         u32 checksum = 0, data_crc = 0, payload_length;
1854         u32 padding = 0, pad_bytes = 0, text_length = 0;
1855         struct iscsi_cmd *cmd;
1856         struct kvec iov[3];
1857         struct iscsi_text *hdr;
1858
1859         hdr                     = (struct iscsi_text *) buf;
1860         payload_length          = ntoh24(hdr->dlength);
1861         hdr->itt                = be32_to_cpu(hdr->itt);
1862         hdr->ttt                = be32_to_cpu(hdr->ttt);
1863         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1864         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1865
1866         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1867                 pr_err("Unable to accept text parameter length: %u"
1868                         "greater than MaxRecvDataSegmentLength %u.\n",
1869                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1870                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1871                                         buf, conn);
1872         }
1873
1874         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1875                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1876                 hdr->exp_statsn, payload_length);
1877
1878         rx_size = text_length = payload_length;
1879         if (text_length) {
1880                 text_in = kzalloc(text_length, GFP_KERNEL);
1881                 if (!text_in) {
1882                         pr_err("Unable to allocate memory for"
1883                                 " incoming text parameters\n");
1884                         return -1;
1885                 }
1886
1887                 memset(iov, 0, 3 * sizeof(struct kvec));
1888                 iov[niov].iov_base      = text_in;
1889                 iov[niov++].iov_len     = text_length;
1890
1891                 padding = ((-payload_length) & 3);
1892                 if (padding != 0) {
1893                         iov[niov].iov_base = &pad_bytes;
1894                         iov[niov++].iov_len  = padding;
1895                         rx_size += padding;
1896                         pr_debug("Receiving %u additional bytes"
1897                                         " for padding.\n", padding);
1898                 }
1899                 if (conn->conn_ops->DataDigest) {
1900                         iov[niov].iov_base      = &checksum;
1901                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1902                         rx_size += ISCSI_CRC_LEN;
1903                 }
1904
1905                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1906                 if (rx_got != rx_size) {
1907                         kfree(text_in);
1908                         return -1;
1909                 }
1910
1911                 if (conn->conn_ops->DataDigest) {
1912                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1913                                         text_in, text_length,
1914                                         padding, (u8 *)&pad_bytes,
1915                                         (u8 *)&data_crc);
1916
1917                         if (checksum != data_crc) {
1918                                 pr_err("Text data CRC32C DataDigest"
1919                                         " 0x%08x does not match computed"
1920                                         " 0x%08x\n", checksum, data_crc);
1921                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1922                                         pr_err("Unable to recover from"
1923                                         " Text Data digest failure while in"
1924                                                 " ERL=0.\n");
1925                                         kfree(text_in);
1926                                         return -1;
1927                                 } else {
1928                                         /*
1929                                          * Silently drop this PDU and let the
1930                                          * initiator plug the CmdSN gap.
1931                                          */
1932                                         pr_debug("Dropping Text"
1933                                         " Command CmdSN: 0x%08x due to"
1934                                         " DataCRC error.\n", hdr->cmdsn);
1935                                         kfree(text_in);
1936                                         return 0;
1937                                 }
1938                         } else {
1939                                 pr_debug("Got CRC32C DataDigest"
1940                                         " 0x%08x for %u bytes of text data.\n",
1941                                                 checksum, text_length);
1942                         }
1943                 }
1944                 text_in[text_length - 1] = '\0';
1945                 pr_debug("Successfully read %d bytes of text"
1946                                 " data.\n", text_length);
1947
1948                 if (strncmp("SendTargets", text_in, 11) != 0) {
1949                         pr_err("Received Text Data that is not"
1950                                 " SendTargets, cannot continue.\n");
1951                         kfree(text_in);
1952                         return -1;
1953                 }
1954                 text_ptr = strchr(text_in, '=');
1955                 if (!text_ptr) {
1956                         pr_err("No \"=\" separator found in Text Data,"
1957                                 "  cannot continue.\n");
1958                         kfree(text_in);
1959                         return -1;
1960                 }
1961                 if (strncmp("=All", text_ptr, 4) != 0) {
1962                         pr_err("Unable to locate All value for"
1963                                 " SendTargets key,  cannot continue.\n");
1964                         kfree(text_in);
1965                         return -1;
1966                 }
1967 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1968                 kfree(text_in);
1969         }
1970
1971         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1972         if (!cmd)
1973                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1974                                         1, buf, conn);
1975
1976         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1977         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1978         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1979         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1980         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1981         cmd->cmd_sn             = hdr->cmdsn;
1982         cmd->exp_stat_sn        = hdr->exp_statsn;
1983         cmd->data_direction     = DMA_NONE;
1984
1985         spin_lock_bh(&conn->cmd_lock);
1986         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1987         spin_unlock_bh(&conn->cmd_lock);
1988
1989         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1990
1991         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1992                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1993                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1994                         return iscsit_add_reject_from_cmd(
1995                                         ISCSI_REASON_PROTOCOL_ERROR,
1996                                         1, 0, buf, cmd);
1997
1998                 return 0;
1999         }
2000
2001         return iscsit_execute_cmd(cmd, 0);
2002 }
2003
2004 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2005 {
2006         struct iscsi_conn *conn_p;
2007         struct iscsi_session *sess = conn->sess;
2008
2009         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2010                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2011
2012         atomic_set(&sess->session_logout, 1);
2013         atomic_set(&conn->conn_logout_remove, 1);
2014         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2015
2016         iscsit_inc_conn_usage_count(conn);
2017         iscsit_inc_session_usage_count(sess);
2018
2019         spin_lock_bh(&sess->conn_lock);
2020         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2021                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2022                         continue;
2023
2024                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2025                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2026         }
2027         spin_unlock_bh(&sess->conn_lock);
2028
2029         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2030
2031         return 0;
2032 }
2033
2034 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2035 {
2036         struct iscsi_conn *l_conn;
2037         struct iscsi_session *sess = conn->sess;
2038
2039         pr_debug("Received logout request CLOSECONNECTION for CID:"
2040                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2041
2042         /*
2043          * A Logout Request with a CLOSECONNECTION reason code for a CID
2044          * can arrive on a connection with a differing CID.
2045          */
2046         if (conn->cid == cmd->logout_cid) {
2047                 spin_lock_bh(&conn->state_lock);
2048                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2049                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2050
2051                 atomic_set(&conn->conn_logout_remove, 1);
2052                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2053                 iscsit_inc_conn_usage_count(conn);
2054
2055                 spin_unlock_bh(&conn->state_lock);
2056         } else {
2057                 /*
2058                  * Handle all different cid CLOSECONNECTION requests in
2059                  * iscsit_logout_post_handler_diffcid() as to give enough
2060                  * time for any non immediate command's CmdSN to be
2061                  * acknowledged on the connection in question.
2062                  *
2063                  * Here we simply make sure the CID is still around.
2064                  */
2065                 l_conn = iscsit_get_conn_from_cid(sess,
2066                                 cmd->logout_cid);
2067                 if (!l_conn) {
2068                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2069                         iscsit_add_cmd_to_response_queue(cmd, conn,
2070                                         cmd->i_state);
2071                         return 0;
2072                 }
2073
2074                 iscsit_dec_conn_usage_count(l_conn);
2075         }
2076
2077         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2078
2079         return 0;
2080 }
2081
2082 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2083 {
2084         struct iscsi_session *sess = conn->sess;
2085
2086         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2087                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2088
2089         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2090                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2091                         " while ERL!=2.\n");
2092                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2093                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2094                 return 0;
2095         }
2096
2097         if (conn->cid == cmd->logout_cid) {
2098                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2099                         " with CID: %hu on CID: %hu, implementation error.\n",
2100                                 cmd->logout_cid, conn->cid);
2101                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2102                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2103                 return 0;
2104         }
2105
2106         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2107
2108         return 0;
2109 }
2110
2111 static int iscsit_handle_logout_cmd(
2112         struct iscsi_conn *conn,
2113         unsigned char *buf)
2114 {
2115         int cmdsn_ret, logout_remove = 0;
2116         u8 reason_code = 0;
2117         struct iscsi_cmd *cmd;
2118         struct iscsi_logout *hdr;
2119         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2120
2121         hdr                     = (struct iscsi_logout *) buf;
2122         reason_code             = (hdr->flags & 0x7f);
2123         hdr->itt                = be32_to_cpu(hdr->itt);
2124         hdr->cid                = be16_to_cpu(hdr->cid);
2125         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2126         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2127
2128         if (tiqn) {
2129                 spin_lock(&tiqn->logout_stats.lock);
2130                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2131                         tiqn->logout_stats.normal_logouts++;
2132                 else
2133                         tiqn->logout_stats.abnormal_logouts++;
2134                 spin_unlock(&tiqn->logout_stats.lock);
2135         }
2136
2137         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2138                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2139                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2140                 hdr->cid, conn->cid);
2141
2142         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2143                 pr_err("Received logout request on connection that"
2144                         " is not in logged in state, ignoring request.\n");
2145                 return 0;
2146         }
2147
2148         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2149         if (!cmd)
2150                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2151                                         buf, conn);
2152
2153         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2154         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2155         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2156         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2157         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2158         cmd->cmd_sn             = hdr->cmdsn;
2159         cmd->exp_stat_sn        = hdr->exp_statsn;
2160         cmd->logout_cid         = hdr->cid;
2161         cmd->logout_reason      = reason_code;
2162         cmd->data_direction     = DMA_NONE;
2163
2164         /*
2165          * We need to sleep in these cases (by returning 1) until the Logout
2166          * Response gets sent in the tx thread.
2167          */
2168         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2169            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2170             (hdr->cid == conn->cid)))
2171                 logout_remove = 1;
2172
2173         spin_lock_bh(&conn->cmd_lock);
2174         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2175         spin_unlock_bh(&conn->cmd_lock);
2176
2177         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2178                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2179
2180         /*
2181          * Immediate commands are executed, well, immediately.
2182          * Non-Immediate Logout Commands are executed in CmdSN order.
2183          */
2184         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2185                 int ret = iscsit_execute_cmd(cmd, 0);
2186
2187                 if (ret < 0)
2188                         return ret;
2189         } else {
2190                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2191                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2192                         logout_remove = 0;
2193                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2194                         return iscsit_add_reject_from_cmd(
2195                                 ISCSI_REASON_PROTOCOL_ERROR,
2196                                 1, 0, buf, cmd);
2197                 }
2198         }
2199
2200         return logout_remove;
2201 }
2202
2203 static int iscsit_handle_snack(
2204         struct iscsi_conn *conn,
2205         unsigned char *buf)
2206 {
2207         u32 unpacked_lun;
2208         u64 lun;
2209         struct iscsi_snack *hdr;
2210
2211         hdr                     = (struct iscsi_snack *) buf;
2212         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2213         lun                     = get_unaligned_le64(&hdr->lun);
2214         unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
2215         hdr->itt                = be32_to_cpu(hdr->itt);
2216         hdr->ttt                = be32_to_cpu(hdr->ttt);
2217         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2218         hdr->begrun             = be32_to_cpu(hdr->begrun);
2219         hdr->runlength          = be32_to_cpu(hdr->runlength);
2220
2221         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2222                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2223                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2224                         hdr->begrun, hdr->runlength, conn->cid);
2225
2226         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2227                 pr_err("Initiator sent SNACK request while in"
2228                         " ErrorRecoveryLevel=0.\n");
2229                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2230                                         buf, conn);
2231         }
2232         /*
2233          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2234          * call from inside iscsi_send_recovery_datain_or_r2t().
2235          */
2236         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2237         case 0:
2238                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2239                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2240         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2241                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2242                         hdr->begrun, hdr->runlength);
2243         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2244                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2245                         hdr->runlength);
2246         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2247                 /* FIXME: Support R-Data SNACK */
2248                 pr_err("R-Data SNACK Not Supported.\n");
2249                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2250                                         buf, conn);
2251         default:
2252                 pr_err("Unknown SNACK type 0x%02x, protocol"
2253                         " error.\n", hdr->flags & 0x0f);
2254                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2255                                         buf, conn);
2256         }
2257
2258         return 0;
2259 }
2260
2261 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2262 {
2263         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2264             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2265                 wait_for_completion_interruptible_timeout(
2266                                         &conn->rx_half_close_comp,
2267                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2268         }
2269 }
2270
2271 static int iscsit_handle_immediate_data(
2272         struct iscsi_cmd *cmd,
2273         unsigned char *buf,
2274         u32 length)
2275 {
2276         int iov_ret, rx_got = 0, rx_size = 0;
2277         u32 checksum, iov_count = 0, padding = 0;
2278         struct iscsi_conn *conn = cmd->conn;
2279         struct kvec *iov;
2280
2281         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2282         if (iov_ret < 0)
2283                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2284
2285         rx_size = length;
2286         iov_count = iov_ret;
2287         iov = &cmd->iov_data[0];
2288
2289         padding = ((-length) & 3);
2290         if (padding != 0) {
2291                 iov[iov_count].iov_base = cmd->pad_bytes;
2292                 iov[iov_count++].iov_len = padding;
2293                 rx_size += padding;
2294         }
2295
2296         if (conn->conn_ops->DataDigest) {
2297                 iov[iov_count].iov_base         = &checksum;
2298                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2299                 rx_size += ISCSI_CRC_LEN;
2300         }
2301
2302         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2303
2304         iscsit_unmap_iovec(cmd);
2305
2306         if (rx_got != rx_size) {
2307                 iscsit_rx_thread_wait_for_tcp(conn);
2308                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2309         }
2310
2311         if (conn->conn_ops->DataDigest) {
2312                 u32 data_crc;
2313
2314                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2315                                                     cmd->write_data_done, length, padding,
2316                                                     cmd->pad_bytes);
2317
2318                 if (checksum != data_crc) {
2319                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2320                                 " does not match computed 0x%08x\n", checksum,
2321                                 data_crc);
2322
2323                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2324                                 pr_err("Unable to recover from"
2325                                         " Immediate Data digest failure while"
2326                                         " in ERL=0.\n");
2327                                 iscsit_add_reject_from_cmd(
2328                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2329                                                 1, 0, buf, cmd);
2330                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2331                         } else {
2332                                 iscsit_add_reject_from_cmd(
2333                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2334                                                 0, 0, buf, cmd);
2335                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2336                         }
2337                 } else {
2338                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2339                                 " %u bytes of Immediate Data\n", checksum,
2340                                 length);
2341                 }
2342         }
2343
2344         cmd->write_data_done += length;
2345
2346         if (cmd->write_data_done == cmd->data_length) {
2347                 spin_lock_bh(&cmd->istate_lock);
2348                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2349                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2350                 spin_unlock_bh(&cmd->istate_lock);
2351         }
2352
2353         return IMMEDIATE_DATA_NORMAL_OPERATION;
2354 }
2355
2356 /*
2357  *      Called with sess->conn_lock held.
2358  */
2359 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2360         with active network interface */
2361 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2362 {
2363         struct iscsi_cmd *cmd;
2364         struct iscsi_conn *conn_p;
2365
2366         /*
2367          * Only send a Asynchronous Message on connections whos network
2368          * interface is still functional.
2369          */
2370         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2371                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2372                         iscsit_inc_conn_usage_count(conn_p);
2373                         break;
2374                 }
2375         }
2376
2377         if (!conn_p)
2378                 return;
2379
2380         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2381         if (!cmd) {
2382                 iscsit_dec_conn_usage_count(conn_p);
2383                 return;
2384         }
2385
2386         cmd->logout_cid = conn->cid;
2387         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2388         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2389
2390         spin_lock_bh(&conn_p->cmd_lock);
2391         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2392         spin_unlock_bh(&conn_p->cmd_lock);
2393
2394         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2395         iscsit_dec_conn_usage_count(conn_p);
2396 }
2397
2398 static int iscsit_send_conn_drop_async_message(
2399         struct iscsi_cmd *cmd,
2400         struct iscsi_conn *conn)
2401 {
2402         struct iscsi_async *hdr;
2403
2404         cmd->tx_size = ISCSI_HDR_LEN;
2405         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2406
2407         hdr                     = (struct iscsi_async *) cmd->pdu;
2408         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2409         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2410         cmd->init_task_tag      = 0xFFFFFFFF;
2411         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2412         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2413         cmd->stat_sn            = conn->stat_sn++;
2414         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2415         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2416         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2417         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2418         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2419         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2420         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2421
2422         if (conn->conn_ops->HeaderDigest) {
2423                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2424
2425                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2426                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2427                                 0, NULL, (u8 *)header_digest);
2428
2429                 cmd->tx_size += ISCSI_CRC_LEN;
2430                 pr_debug("Attaching CRC32C HeaderDigest to"
2431                         " Async Message 0x%08x\n", *header_digest);
2432         }
2433
2434         cmd->iov_misc[0].iov_base       = cmd->pdu;
2435         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2436         cmd->iov_misc_count             = 1;
2437
2438         pr_debug("Sending Connection Dropped Async Message StatSN:"
2439                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2440                         cmd->logout_cid, conn->cid);
2441         return 0;
2442 }
2443
2444 static int iscsit_send_data_in(
2445         struct iscsi_cmd *cmd,
2446         struct iscsi_conn *conn,
2447         int *eodr)
2448 {
2449         int iov_ret = 0, set_statsn = 0;
2450         u32 iov_count = 0, tx_size = 0;
2451         struct iscsi_datain datain;
2452         struct iscsi_datain_req *dr;
2453         struct iscsi_data_rsp *hdr;
2454         struct kvec *iov;
2455
2456         memset(&datain, 0, sizeof(struct iscsi_datain));
2457         dr = iscsit_get_datain_values(cmd, &datain);
2458         if (!dr) {
2459                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2460                                 cmd->init_task_tag);
2461                 return -1;
2462         }
2463
2464         /*
2465          * Be paranoid and double check the logic for now.
2466          */
2467         if ((datain.offset + datain.length) > cmd->data_length) {
2468                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2469                         " datain.length: %u exceeds cmd->data_length: %u\n",
2470                         cmd->init_task_tag, datain.offset, datain.length,
2471                                 cmd->data_length);
2472                 return -1;
2473         }
2474
2475         spin_lock_bh(&conn->sess->session_stats_lock);
2476         conn->sess->tx_data_octets += datain.length;
2477         if (conn->sess->se_sess->se_node_acl) {
2478                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2479                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2480                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2481         }
2482         spin_unlock_bh(&conn->sess->session_stats_lock);
2483         /*
2484          * Special case for successfully execution w/ both DATAIN
2485          * and Sense Data.
2486          */
2487         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2488             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2489                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2490         else {
2491                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2492                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2493                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2494                         cmd->stat_sn = conn->stat_sn++;
2495                         set_statsn = 1;
2496                 } else if (dr->dr_complete ==
2497                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2498                         set_statsn = 1;
2499         }
2500
2501         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2502         memset(hdr, 0, ISCSI_HDR_LEN);
2503         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2504         hdr->flags              = datain.flags;
2505         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2506                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2507                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2508                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2509                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2510                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2511                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2512                 }
2513         }
2514         hton24(hdr->dlength, datain.length);
2515         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2516                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2517                                 (struct scsi_lun *)&hdr->lun);
2518         else
2519                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2520
2521         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2522         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2523                                    cpu_to_be32(cmd->targ_xfer_tag) :
2524                                    0xFFFFFFFF;
2525         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2526                                                 0xFFFFFFFF;
2527         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2528         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2529         hdr->datasn             = cpu_to_be32(datain.data_sn);
2530         hdr->offset             = cpu_to_be32(datain.offset);
2531
2532         iov = &cmd->iov_data[0];
2533         iov[iov_count].iov_base = cmd->pdu;
2534         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2535         tx_size += ISCSI_HDR_LEN;
2536
2537         if (conn->conn_ops->HeaderDigest) {
2538                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2539
2540                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2541                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2542                                 0, NULL, (u8 *)header_digest);
2543
2544                 iov[0].iov_len += ISCSI_CRC_LEN;
2545                 tx_size += ISCSI_CRC_LEN;
2546
2547                 pr_debug("Attaching CRC32 HeaderDigest"
2548                         " for DataIN PDU 0x%08x\n", *header_digest);
2549         }
2550
2551         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2552         if (iov_ret < 0)
2553                 return -1;
2554
2555         iov_count += iov_ret;
2556         tx_size += datain.length;
2557
2558         cmd->padding = ((-datain.length) & 3);
2559         if (cmd->padding) {
2560                 iov[iov_count].iov_base         = cmd->pad_bytes;
2561                 iov[iov_count++].iov_len        = cmd->padding;
2562                 tx_size += cmd->padding;
2563
2564                 pr_debug("Attaching %u padding bytes\n",
2565                                 cmd->padding);
2566         }
2567         if (conn->conn_ops->DataDigest) {
2568                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2569                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2570
2571                 iov[iov_count].iov_base = &cmd->data_crc;
2572                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2573                 tx_size += ISCSI_CRC_LEN;
2574
2575                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2576                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2577         }
2578
2579         cmd->iov_data_count = iov_count;
2580         cmd->tx_size = tx_size;
2581
2582         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2583                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2584                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2585                 ntohl(hdr->offset), datain.length, conn->cid);
2586
2587         if (dr->dr_complete) {
2588                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2589                                 2 : 1;
2590                 iscsit_free_datain_req(cmd, dr);
2591         }
2592
2593         return 0;
2594 }
2595
2596 static int iscsit_send_logout_response(
2597         struct iscsi_cmd *cmd,
2598         struct iscsi_conn *conn)
2599 {
2600         int niov = 0, tx_size;
2601         struct iscsi_conn *logout_conn = NULL;
2602         struct iscsi_conn_recovery *cr = NULL;
2603         struct iscsi_session *sess = conn->sess;
2604         struct kvec *iov;
2605         struct iscsi_logout_rsp *hdr;
2606         /*
2607          * The actual shutting down of Sessions and/or Connections
2608          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2609          * is done in scsi_logout_post_handler().
2610          */
2611         switch (cmd->logout_reason) {
2612         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2613                 pr_debug("iSCSI session logout successful, setting"
2614                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2615                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2616                 break;
2617         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2618                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2619                         break;
2620                 /*
2621                  * For CLOSECONNECTION logout requests carrying
2622                  * a matching logout CID -> local CID, the reference
2623                  * for the local CID will have been incremented in
2624                  * iscsi_logout_closeconnection().
2625                  *
2626                  * For CLOSECONNECTION logout requests carrying
2627                  * a different CID than the connection it arrived
2628                  * on, the connection responding to cmd->logout_cid
2629                  * is stopped in iscsit_logout_post_handler_diffcid().
2630                  */
2631
2632                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2633                         " successful.\n", cmd->logout_cid, conn->cid);
2634                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2635                 break;
2636         case ISCSI_LOGOUT_REASON_RECOVERY:
2637                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2638                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2639                         break;
2640                 /*
2641                  * If the connection is still active from our point of view
2642                  * force connection recovery to occur.
2643                  */
2644                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2645                                 cmd->logout_cid);
2646                 if ((logout_conn)) {
2647                         iscsit_connection_reinstatement_rcfr(logout_conn);
2648                         iscsit_dec_conn_usage_count(logout_conn);
2649                 }
2650
2651                 cr = iscsit_get_inactive_connection_recovery_entry(
2652                                 conn->sess, cmd->logout_cid);
2653                 if (!cr) {
2654                         pr_err("Unable to locate CID: %hu for"
2655                         " REMOVECONNFORRECOVERY Logout Request.\n",
2656                                 cmd->logout_cid);
2657                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2658                         break;
2659                 }
2660
2661                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2662
2663                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2664                         " for recovery for CID: %hu on CID: %hu successful.\n",
2665                                 cmd->logout_cid, conn->cid);
2666                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2667                 break;
2668         default:
2669                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2670                                 cmd->logout_reason);
2671                 return -1;
2672         }
2673
2674         tx_size = ISCSI_HDR_LEN;
2675         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2676         memset(hdr, 0, ISCSI_HDR_LEN);
2677         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2678         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2679         hdr->response           = cmd->logout_response;
2680         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2681         cmd->stat_sn            = conn->stat_sn++;
2682         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2683
2684         iscsit_increment_maxcmdsn(cmd, conn->sess);
2685         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2686         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2687
2688         iov = &cmd->iov_misc[0];
2689         iov[niov].iov_base      = cmd->pdu;
2690         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2691
2692         if (conn->conn_ops->HeaderDigest) {
2693                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2694
2695                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2696                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2697                                 0, NULL, (u8 *)header_digest);
2698
2699                 iov[0].iov_len += ISCSI_CRC_LEN;
2700                 tx_size += ISCSI_CRC_LEN;
2701                 pr_debug("Attaching CRC32C HeaderDigest to"
2702                         " Logout Response 0x%08x\n", *header_digest);
2703         }
2704         cmd->iov_misc_count = niov;
2705         cmd->tx_size = tx_size;
2706
2707         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2708                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2709                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2710                 cmd->logout_cid, conn->cid);
2711
2712         return 0;
2713 }
2714
2715 /*
2716  *      Unsolicited NOPIN, either requesting a response or not.
2717  */
2718 static int iscsit_send_unsolicited_nopin(
2719         struct iscsi_cmd *cmd,
2720         struct iscsi_conn *conn,
2721         int want_response)
2722 {
2723         int tx_size = ISCSI_HDR_LEN;
2724         struct iscsi_nopin *hdr;
2725
2726         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2727         memset(hdr, 0, ISCSI_HDR_LEN);
2728         hdr->opcode             = ISCSI_OP_NOOP_IN;
2729         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2730         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2731         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2732         cmd->stat_sn            = conn->stat_sn;
2733         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2734         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2735         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2736
2737         if (conn->conn_ops->HeaderDigest) {
2738                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2739
2740                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2741                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2742                                 0, NULL, (u8 *)header_digest);
2743
2744                 tx_size += ISCSI_CRC_LEN;
2745                 pr_debug("Attaching CRC32C HeaderDigest to"
2746                         " NopIN 0x%08x\n", *header_digest);
2747         }
2748
2749         cmd->iov_misc[0].iov_base       = cmd->pdu;
2750         cmd->iov_misc[0].iov_len        = tx_size;
2751         cmd->iov_misc_count     = 1;
2752         cmd->tx_size            = tx_size;
2753
2754         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2755                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2756
2757         return 0;
2758 }
2759
2760 static int iscsit_send_nopin_response(
2761         struct iscsi_cmd *cmd,
2762         struct iscsi_conn *conn)
2763 {
2764         int niov = 0, tx_size;
2765         u32 padding = 0;
2766         struct kvec *iov;
2767         struct iscsi_nopin *hdr;
2768
2769         tx_size = ISCSI_HDR_LEN;
2770         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2771         memset(hdr, 0, ISCSI_HDR_LEN);
2772         hdr->opcode             = ISCSI_OP_NOOP_IN;
2773         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2774         hton24(hdr->dlength, cmd->buf_ptr_size);
2775         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2776         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2777         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2778         cmd->stat_sn            = conn->stat_sn++;
2779         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2780
2781         iscsit_increment_maxcmdsn(cmd, conn->sess);
2782         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2783         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2784
2785         iov = &cmd->iov_misc[0];
2786         iov[niov].iov_base      = cmd->pdu;
2787         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2788
2789         if (conn->conn_ops->HeaderDigest) {
2790                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2791
2792                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2793                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2794                                 0, NULL, (u8 *)header_digest);
2795
2796                 iov[0].iov_len += ISCSI_CRC_LEN;
2797                 tx_size += ISCSI_CRC_LEN;
2798                 pr_debug("Attaching CRC32C HeaderDigest"
2799                         " to NopIn 0x%08x\n", *header_digest);
2800         }
2801
2802         /*
2803          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2804          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2805          */
2806         if (cmd->buf_ptr_size) {
2807                 iov[niov].iov_base      = cmd->buf_ptr;
2808                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2809                 tx_size += cmd->buf_ptr_size;
2810
2811                 pr_debug("Echoing back %u bytes of ping"
2812                         " data.\n", cmd->buf_ptr_size);
2813
2814                 padding = ((-cmd->buf_ptr_size) & 3);
2815                 if (padding != 0) {
2816                         iov[niov].iov_base = &cmd->pad_bytes;
2817                         iov[niov++].iov_len = padding;
2818                         tx_size += padding;
2819                         pr_debug("Attaching %u additional"
2820                                 " padding bytes.\n", padding);
2821                 }
2822                 if (conn->conn_ops->DataDigest) {
2823                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2824                                 cmd->buf_ptr, cmd->buf_ptr_size,
2825                                 padding, (u8 *)&cmd->pad_bytes,
2826                                 (u8 *)&cmd->data_crc);
2827
2828                         iov[niov].iov_base = &cmd->data_crc;
2829                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2830                         tx_size += ISCSI_CRC_LEN;
2831                         pr_debug("Attached DataDigest for %u"
2832                                 " bytes of ping data, CRC 0x%08x\n",
2833                                 cmd->buf_ptr_size, cmd->data_crc);
2834                 }
2835         }
2836
2837         cmd->iov_misc_count = niov;
2838         cmd->tx_size = tx_size;
2839
2840         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2841                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2842                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2843
2844         return 0;
2845 }
2846
2847 int iscsit_send_r2t(
2848         struct iscsi_cmd *cmd,
2849         struct iscsi_conn *conn)
2850 {
2851         int tx_size = 0;
2852         struct iscsi_r2t *r2t;
2853         struct iscsi_r2t_rsp *hdr;
2854
2855         r2t = iscsit_get_r2t_from_list(cmd);
2856         if (!r2t)
2857                 return -1;
2858
2859         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2860         memset(hdr, 0, ISCSI_HDR_LEN);
2861         hdr->opcode             = ISCSI_OP_R2T;
2862         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2863         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2864                         (struct scsi_lun *)&hdr->lun);
2865         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2866         spin_lock_bh(&conn->sess->ttt_lock);
2867         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2868         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2869                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2870         spin_unlock_bh(&conn->sess->ttt_lock);
2871         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2872         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2873         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2874         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2875         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2876         hdr->data_offset        = cpu_to_be32(r2t->offset);
2877         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2878
2879         cmd->iov_misc[0].iov_base       = cmd->pdu;
2880         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2881         tx_size += ISCSI_HDR_LEN;
2882
2883         if (conn->conn_ops->HeaderDigest) {
2884                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2885
2886                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2887                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2888                                 0, NULL, (u8 *)header_digest);
2889
2890                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2891                 tx_size += ISCSI_CRC_LEN;
2892                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2893                         " PDU 0x%08x\n", *header_digest);
2894         }
2895
2896         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2897                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2898                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2899                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2900                         r2t->offset, r2t->xfer_len, conn->cid);
2901
2902         cmd->iov_misc_count = 1;
2903         cmd->tx_size = tx_size;
2904
2905         spin_lock_bh(&cmd->r2t_lock);
2906         r2t->sent_r2t = 1;
2907         spin_unlock_bh(&cmd->r2t_lock);
2908
2909         return 0;
2910 }
2911
2912 /*
2913  *      type 0: Normal Operation.
2914  *      type 1: Called from Storage Transport.
2915  *      type 2: Called from iscsi_task_reassign_complete_write() for
2916  *              connection recovery.
2917  */
2918 int iscsit_build_r2ts_for_cmd(
2919         struct iscsi_cmd *cmd,
2920         struct iscsi_conn *conn,
2921         int type)
2922 {
2923         int first_r2t = 1;
2924         u32 offset = 0, xfer_len = 0;
2925
2926         spin_lock_bh(&cmd->r2t_lock);
2927         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2928                 spin_unlock_bh(&cmd->r2t_lock);
2929                 return 0;
2930         }
2931
2932         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2933                 if (cmd->r2t_offset < cmd->write_data_done)
2934                         cmd->r2t_offset = cmd->write_data_done;
2935
2936         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2937                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2938                         offset = cmd->r2t_offset;
2939
2940                         if (first_r2t && (type == 2)) {
2941                                 xfer_len = ((offset +
2942                                              (conn->sess->sess_ops->MaxBurstLength -
2943                                              cmd->next_burst_len) >
2944                                              cmd->data_length) ?
2945                                             (cmd->data_length - offset) :
2946                                             (conn->sess->sess_ops->MaxBurstLength -
2947                                              cmd->next_burst_len));
2948                         } else {
2949                                 xfer_len = ((offset +
2950                                              conn->sess->sess_ops->MaxBurstLength) >
2951                                              cmd->data_length) ?
2952                                              (cmd->data_length - offset) :
2953                                              conn->sess->sess_ops->MaxBurstLength;
2954                         }
2955                         cmd->r2t_offset += xfer_len;
2956
2957                         if (cmd->r2t_offset == cmd->data_length)
2958                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2959                 } else {
2960                         struct iscsi_seq *seq;
2961
2962                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2963                         if (!seq) {
2964                                 spin_unlock_bh(&cmd->r2t_lock);
2965                                 return -1;
2966                         }
2967
2968                         offset = seq->offset;
2969                         xfer_len = seq->xfer_len;
2970
2971                         if (cmd->seq_send_order == cmd->seq_count)
2972                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2973                 }
2974                 cmd->outstanding_r2ts++;
2975                 first_r2t = 0;
2976
2977                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2978                         spin_unlock_bh(&cmd->r2t_lock);
2979                         return -1;
2980                 }
2981
2982                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2983                         break;
2984         }
2985         spin_unlock_bh(&cmd->r2t_lock);
2986
2987         return 0;
2988 }
2989
2990 static int iscsit_send_status(
2991         struct iscsi_cmd *cmd,
2992         struct iscsi_conn *conn)
2993 {
2994         u8 iov_count = 0, recovery;
2995         u32 padding = 0, tx_size = 0;
2996         struct iscsi_scsi_rsp *hdr;
2997         struct kvec *iov;
2998
2999         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3000         if (!recovery)
3001                 cmd->stat_sn = conn->stat_sn++;
3002
3003         spin_lock_bh(&conn->sess->session_stats_lock);
3004         conn->sess->rsp_pdus++;
3005         spin_unlock_bh(&conn->sess->session_stats_lock);
3006
3007         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3008         memset(hdr, 0, ISCSI_HDR_LEN);
3009         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3010         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3011         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3012                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3013                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3014         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3015                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3016                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3017         }
3018         hdr->response           = cmd->iscsi_response;
3019         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3020         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3021         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3022
3023         iscsit_increment_maxcmdsn(cmd, conn->sess);
3024         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3025         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3026
3027         iov = &cmd->iov_misc[0];
3028         iov[iov_count].iov_base = cmd->pdu;
3029         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3030         tx_size += ISCSI_HDR_LEN;
3031
3032         /*
3033          * Attach SENSE DATA payload to iSCSI Response PDU
3034          */
3035         if (cmd->se_cmd.sense_buffer &&
3036            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3037             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3038                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3039                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3040                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3041                 iov[iov_count++].iov_len =
3042                                 (cmd->se_cmd.scsi_sense_length + padding);
3043                 tx_size += cmd->se_cmd.scsi_sense_length;
3044
3045                 if (padding) {
3046                         memset(cmd->se_cmd.sense_buffer +
3047                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3048                         tx_size += padding;
3049                         pr_debug("Adding %u bytes of padding to"
3050                                 " SENSE.\n", padding);
3051                 }
3052
3053                 if (conn->conn_ops->DataDigest) {
3054                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3055                                 cmd->se_cmd.sense_buffer,
3056                                 (cmd->se_cmd.scsi_sense_length + padding),
3057                                 0, NULL, (u8 *)&cmd->data_crc);
3058
3059                         iov[iov_count].iov_base    = &cmd->data_crc;
3060                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3061                         tx_size += ISCSI_CRC_LEN;
3062
3063                         pr_debug("Attaching CRC32 DataDigest for"
3064                                 " SENSE, %u bytes CRC 0x%08x\n",
3065                                 (cmd->se_cmd.scsi_sense_length + padding),
3066                                 cmd->data_crc);
3067                 }
3068
3069                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3070                                 " Response PDU\n",
3071                                 cmd->se_cmd.scsi_sense_length);
3072         }
3073
3074         if (conn->conn_ops->HeaderDigest) {
3075                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3076
3077                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3078                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3079                                 0, NULL, (u8 *)header_digest);
3080
3081                 iov[0].iov_len += ISCSI_CRC_LEN;
3082                 tx_size += ISCSI_CRC_LEN;
3083                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3084                                 " PDU 0x%08x\n", *header_digest);
3085         }
3086
3087         cmd->iov_misc_count = iov_count;
3088         cmd->tx_size = tx_size;
3089
3090         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3091                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3092                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3093                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3094
3095         return 0;
3096 }
3097
3098 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3099 {
3100         switch (se_tmr->response) {
3101         case TMR_FUNCTION_COMPLETE:
3102                 return ISCSI_TMF_RSP_COMPLETE;
3103         case TMR_TASK_DOES_NOT_EXIST:
3104                 return ISCSI_TMF_RSP_NO_TASK;
3105         case TMR_LUN_DOES_NOT_EXIST:
3106                 return ISCSI_TMF_RSP_NO_LUN;
3107         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3108                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3109         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3110                 return ISCSI_TMF_RSP_AUTH_FAILED;
3111         case TMR_FUNCTION_REJECTED:
3112         default:
3113                 return ISCSI_TMF_RSP_REJECTED;
3114         }
3115 }
3116
3117 static int iscsit_send_task_mgt_rsp(
3118         struct iscsi_cmd *cmd,
3119         struct iscsi_conn *conn)
3120 {
3121         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3122         struct iscsi_tm_rsp *hdr;
3123         u32 tx_size = 0;
3124
3125         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3126         memset(hdr, 0, ISCSI_HDR_LEN);
3127         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3128         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3129         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3130         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3131         cmd->stat_sn            = conn->stat_sn++;
3132         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3133
3134         iscsit_increment_maxcmdsn(cmd, conn->sess);
3135         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3136         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3137
3138         cmd->iov_misc[0].iov_base       = cmd->pdu;
3139         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3140         tx_size += ISCSI_HDR_LEN;
3141
3142         if (conn->conn_ops->HeaderDigest) {
3143                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3144
3145                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3146                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3147                                 0, NULL, (u8 *)header_digest);
3148
3149                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3150                 tx_size += ISCSI_CRC_LEN;
3151                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3152                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3153         }
3154
3155         cmd->iov_misc_count = 1;
3156         cmd->tx_size = tx_size;
3157
3158         pr_debug("Built Task Management Response ITT: 0x%08x,"
3159                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3160                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3161
3162         return 0;
3163 }
3164
3165 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3166 {
3167         bool ret = false;
3168
3169         if (np->np_sockaddr.ss_family == AF_INET6) {
3170                 const struct sockaddr_in6 sin6 = {
3171                         .sin6_addr = IN6ADDR_ANY_INIT };
3172                 struct sockaddr_in6 *sock_in6 =
3173                          (struct sockaddr_in6 *)&np->np_sockaddr;
3174
3175                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3176                                 sin6.sin6_addr.s6_addr, 16))
3177                         ret = true;
3178         } else {
3179                 struct sockaddr_in * sock_in =
3180                         (struct sockaddr_in *)&np->np_sockaddr;
3181
3182                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3183                         ret = true;
3184         }
3185
3186         return ret;
3187 }
3188
3189 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3190 {
3191         char *payload = NULL;
3192         struct iscsi_conn *conn = cmd->conn;
3193         struct iscsi_portal_group *tpg;
3194         struct iscsi_tiqn *tiqn;
3195         struct iscsi_tpg_np *tpg_np;
3196         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3197         unsigned char buf[256];
3198
3199         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3200                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3201
3202         memset(buf, 0, 256);
3203
3204         payload = kzalloc(buffer_len, GFP_KERNEL);
3205         if (!payload) {
3206                 pr_err("Unable to allocate memory for sendtargets"
3207                                 " response.\n");
3208                 return -ENOMEM;
3209         }
3210
3211         spin_lock(&tiqn_lock);
3212         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3213                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3214                 len += 1;
3215
3216                 if ((len + payload_len) > buffer_len) {
3217                         spin_unlock(&tiqn->tiqn_tpg_lock);
3218                         end_of_buf = 1;
3219                         goto eob;
3220                 }
3221                 memcpy(payload + payload_len, buf, len);
3222                 payload_len += len;
3223
3224                 spin_lock(&tiqn->tiqn_tpg_lock);
3225                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3226
3227                         spin_lock(&tpg->tpg_state_lock);
3228                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3229                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3230                                 spin_unlock(&tpg->tpg_state_lock);
3231                                 continue;
3232                         }
3233                         spin_unlock(&tpg->tpg_state_lock);
3234
3235                         spin_lock(&tpg->tpg_np_lock);
3236                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3237                                                 tpg_np_list) {
3238                                 struct iscsi_np *np = tpg_np->tpg_np;
3239                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3240
3241                                 len = sprintf(buf, "TargetAddress="
3242                                         "%s%s%s:%hu,%hu",
3243                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3244                                         "[" : "", (inaddr_any == false) ?
3245                                                 np->np_ip : conn->local_ip,
3246                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3247                                         "]" : "", (inaddr_any == false) ?
3248                                                 np->np_port : conn->local_port,
3249                                         tpg->tpgt);
3250                                 len += 1;
3251
3252                                 if ((len + payload_len) > buffer_len) {
3253                                         spin_unlock(&tpg->tpg_np_lock);
3254                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3255                                         end_of_buf = 1;
3256                                         goto eob;
3257                                 }
3258                                 memcpy(payload + payload_len, buf, len);
3259                                 payload_len += len;
3260                         }
3261                         spin_unlock(&tpg->tpg_np_lock);
3262                 }
3263                 spin_unlock(&tiqn->tiqn_tpg_lock);
3264 eob:
3265                 if (end_of_buf)
3266                         break;
3267         }
3268         spin_unlock(&tiqn_lock);
3269
3270         cmd->buf_ptr = payload;
3271
3272         return payload_len;
3273 }
3274
3275 /*
3276  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3277  *      MaxRecvDataSegmentLength.
3278  */
3279 static int iscsit_send_text_rsp(
3280         struct iscsi_cmd *cmd,
3281         struct iscsi_conn *conn)
3282 {
3283         struct iscsi_text_rsp *hdr;
3284         struct kvec *iov;
3285         u32 padding = 0, tx_size = 0;
3286         int text_length, iov_count = 0;
3287
3288         text_length = iscsit_build_sendtargets_response(cmd);
3289         if (text_length < 0)
3290                 return text_length;
3291
3292         padding = ((-text_length) & 3);
3293         if (padding != 0) {
3294                 memset(cmd->buf_ptr + text_length, 0, padding);
3295                 pr_debug("Attaching %u additional bytes for"
3296                         " padding.\n", padding);
3297         }
3298
3299         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3300         memset(hdr, 0, ISCSI_HDR_LEN);
3301         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3302         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3303         hton24(hdr->dlength, text_length);
3304         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3305         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3306         cmd->stat_sn            = conn->stat_sn++;
3307         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3308
3309         iscsit_increment_maxcmdsn(cmd, conn->sess);
3310         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3311         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3312
3313         iov = &cmd->iov_misc[0];
3314
3315         iov[iov_count].iov_base = cmd->pdu;
3316         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3317         iov[iov_count].iov_base = cmd->buf_ptr;
3318         iov[iov_count++].iov_len = text_length + padding;
3319
3320         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3321
3322         if (conn->conn_ops->HeaderDigest) {
3323                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3324
3325                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3326                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3327                                 0, NULL, (u8 *)header_digest);
3328
3329                 iov[0].iov_len += ISCSI_CRC_LEN;
3330                 tx_size += ISCSI_CRC_LEN;
3331                 pr_debug("Attaching CRC32 HeaderDigest for"
3332                         " Text Response PDU 0x%08x\n", *header_digest);
3333         }
3334
3335         if (conn->conn_ops->DataDigest) {
3336                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3337                                 cmd->buf_ptr, (text_length + padding),
3338                                 0, NULL, (u8 *)&cmd->data_crc);
3339
3340                 iov[iov_count].iov_base = &cmd->data_crc;
3341                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3342                 tx_size += ISCSI_CRC_LEN;
3343
3344                 pr_debug("Attaching DataDigest for %u bytes of text"
3345                         " data, CRC 0x%08x\n", (text_length + padding),
3346                         cmd->data_crc);
3347         }
3348
3349         cmd->iov_misc_count = iov_count;
3350         cmd->tx_size = tx_size;
3351
3352         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3353                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3354                         text_length, conn->cid);
3355         return 0;
3356 }
3357
3358 static int iscsit_send_reject(
3359         struct iscsi_cmd *cmd,
3360         struct iscsi_conn *conn)
3361 {
3362         u32 iov_count = 0, tx_size = 0;
3363         struct iscsi_reject *hdr;
3364         struct kvec *iov;
3365
3366         hdr                     = (struct iscsi_reject *) cmd->pdu;
3367         hdr->opcode             = ISCSI_OP_REJECT;
3368         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3369         hton24(hdr->dlength, ISCSI_HDR_LEN);
3370         cmd->stat_sn            = conn->stat_sn++;
3371         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3372         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3373         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3374
3375         iov = &cmd->iov_misc[0];
3376
3377         iov[iov_count].iov_base = cmd->pdu;
3378         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3379         iov[iov_count].iov_base = cmd->buf_ptr;
3380         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3381
3382         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3383
3384         if (conn->conn_ops->HeaderDigest) {
3385                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3386
3387                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3388                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3389                                 0, NULL, (u8 *)header_digest);
3390
3391                 iov[0].iov_len += ISCSI_CRC_LEN;
3392                 tx_size += ISCSI_CRC_LEN;
3393                 pr_debug("Attaching CRC32 HeaderDigest for"
3394                         " REJECT PDU 0x%08x\n", *header_digest);
3395         }
3396
3397         if (conn->conn_ops->DataDigest) {
3398                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3399                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3400                                 0, NULL, (u8 *)&cmd->data_crc);
3401
3402                 iov[iov_count].iov_base = &cmd->data_crc;
3403                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3404                 tx_size += ISCSI_CRC_LEN;
3405                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3406                                 " PDU 0x%08x\n", cmd->data_crc);
3407         }
3408
3409         cmd->iov_misc_count = iov_count;
3410         cmd->tx_size = tx_size;
3411
3412         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3413                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3414
3415         return 0;
3416 }
3417
3418 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3419 {
3420         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3421             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3422                 wait_for_completion_interruptible_timeout(
3423                                         &conn->tx_half_close_comp,
3424                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3425         }
3426 }
3427
3428 #ifdef CONFIG_SMP
3429
3430 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3431 {
3432         struct iscsi_thread_set *ts = conn->thread_set;
3433         int ord, cpu;
3434         /*
3435          * thread_id is assigned from iscsit_global->ts_bitmap from
3436          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3437          *
3438          * Here we use thread_id to determine which CPU that this
3439          * iSCSI connection's iscsi_thread_set will be scheduled to
3440          * execute upon.
3441          */
3442         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3443 #if 0
3444         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3445                         " thread_id: %d\n", ord, ts->thread_id);
3446 #endif
3447         for_each_online_cpu(cpu) {
3448                 if (ord-- == 0) {
3449                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3450                         return;
3451                 }
3452         }
3453         /*
3454          * This should never be reached..
3455          */
3456         dump_stack();
3457         cpumask_setall(conn->conn_cpumask);
3458 }
3459
3460 static inline void iscsit_thread_check_cpumask(
3461         struct iscsi_conn *conn,
3462         struct task_struct *p,
3463         int mode)
3464 {
3465         char buf[128];
3466         /*
3467          * mode == 1 signals iscsi_target_tx_thread() usage.
3468          * mode == 0 signals iscsi_target_rx_thread() usage.
3469          */
3470         if (mode == 1) {
3471                 if (!conn->conn_tx_reset_cpumask)
3472                         return;
3473                 conn->conn_tx_reset_cpumask = 0;
3474         } else {
3475                 if (!conn->conn_rx_reset_cpumask)
3476                         return;
3477                 conn->conn_rx_reset_cpumask = 0;
3478         }
3479         /*
3480          * Update the CPU mask for this single kthread so that
3481          * both TX and RX kthreads are scheduled to run on the
3482          * same CPU.
3483          */
3484         memset(buf, 0, 128);
3485         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3486 #if 0
3487         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3488                         " %s for %s\n", buf, p->comm);
3489 #endif
3490         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3491 }
3492
3493 #else
3494
3495 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3496 {
3497         return;
3498 }
3499
3500 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3501 #endif /* CONFIG_SMP */
3502
3503 int iscsi_target_tx_thread(void *arg)
3504 {
3505         u8 state;
3506         int eodr = 0;
3507         int ret = 0;
3508         int sent_status = 0;
3509         int use_misc = 0;
3510         int map_sg = 0;
3511         struct iscsi_cmd *cmd = NULL;
3512         struct iscsi_conn *conn;
3513         struct iscsi_queue_req *qr = NULL;
3514         struct se_cmd *se_cmd;
3515         struct iscsi_thread_set *ts = arg;
3516         /*
3517          * Allow ourselves to be interrupted by SIGINT so that a
3518          * connection recovery / failure event can be triggered externally.
3519          */
3520         allow_signal(SIGINT);
3521
3522 restart:
3523         conn = iscsi_tx_thread_pre_handler(ts);
3524         if (!conn)
3525                 goto out;
3526
3527         eodr = map_sg = ret = sent_status = use_misc = 0;
3528
3529         while (!kthread_should_stop()) {
3530                 /*
3531                  * Ensure that both TX and RX per connection kthreads
3532                  * are scheduled to run on the same CPU.
3533                  */
3534                 iscsit_thread_check_cpumask(conn, current, 1);
3535
3536                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3537
3538                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3539                      signal_pending(current))
3540                         goto transport_err;
3541
3542 get_immediate:
3543                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3544                 if (qr) {
3545                         atomic_set(&conn->check_immediate_queue, 0);
3546                         cmd = qr->cmd;
3547                         state = qr->state;
3548                         kmem_cache_free(lio_qr_cache, qr);
3549
3550                         spin_lock_bh(&cmd->istate_lock);
3551                         switch (state) {
3552                         case ISTATE_SEND_R2T:
3553                                 spin_unlock_bh(&cmd->istate_lock);
3554                                 ret = iscsit_send_r2t(cmd, conn);
3555                                 break;
3556                         case ISTATE_REMOVE:
3557                                 spin_unlock_bh(&cmd->istate_lock);
3558
3559                                 if (cmd->data_direction == DMA_TO_DEVICE)
3560                                         iscsit_stop_dataout_timer(cmd);
3561
3562                                 spin_lock_bh(&conn->cmd_lock);
3563                                 list_del(&cmd->i_list);
3564                                 spin_unlock_bh(&conn->cmd_lock);
3565
3566                                 iscsit_free_cmd(cmd);
3567                                 goto get_immediate;
3568                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3569                                 spin_unlock_bh(&cmd->istate_lock);
3570                                 iscsit_mod_nopin_response_timer(conn);
3571                                 ret = iscsit_send_unsolicited_nopin(cmd,
3572                                                 conn, 1);
3573                                 break;
3574                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3575                                 spin_unlock_bh(&cmd->istate_lock);
3576                                 ret = iscsit_send_unsolicited_nopin(cmd,
3577                                                 conn, 0);
3578                                 break;
3579                         default:
3580                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3581                                 " 0x%08x, i_state: %d on CID: %hu\n",
3582                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3583                                 conn->cid);
3584                                 spin_unlock_bh(&cmd->istate_lock);
3585                                 goto transport_err;
3586                         }
3587                         if (ret < 0) {
3588                                 conn->tx_immediate_queue = 0;
3589                                 goto transport_err;
3590                         }
3591
3592                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3593                                 conn->tx_immediate_queue = 0;
3594                                 iscsit_tx_thread_wait_for_tcp(conn);
3595                                 goto transport_err;
3596                         }
3597
3598                         spin_lock_bh(&cmd->istate_lock);
3599                         switch (state) {
3600                         case ISTATE_SEND_R2T:
3601                                 spin_unlock_bh(&cmd->istate_lock);
3602                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3603                                 iscsit_start_dataout_timer(cmd, conn);
3604                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3605                                 break;
3606                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3607                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3608                                 spin_unlock_bh(&cmd->istate_lock);
3609                                 break;
3610                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3611                                 cmd->i_state = ISTATE_SENT_STATUS;
3612                                 spin_unlock_bh(&cmd->istate_lock);
3613                                 break;
3614                         default:
3615                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3616                                         " 0x%08x, i_state: %d on CID: %hu\n",
3617                                         cmd->iscsi_opcode, cmd->init_task_tag,
3618                                         state, conn->cid);
3619                                 spin_unlock_bh(&cmd->istate_lock);
3620                                 goto transport_err;
3621                         }
3622                         goto get_immediate;
3623                 } else
3624                         conn->tx_immediate_queue = 0;
3625
3626 get_response:
3627                 qr = iscsit_get_cmd_from_response_queue(conn);
3628                 if (qr) {
3629                         cmd = qr->cmd;
3630                         state = qr->state;
3631                         kmem_cache_free(lio_qr_cache, qr);
3632
3633                         spin_lock_bh(&cmd->istate_lock);
3634 check_rsp_state:
3635                         switch (state) {
3636                         case ISTATE_SEND_DATAIN:
3637                                 spin_unlock_bh(&cmd->istate_lock);
3638                                 ret = iscsit_send_data_in(cmd, conn,
3639                                                           &eodr);
3640                                 map_sg = 1;
3641                                 break;
3642                         case ISTATE_SEND_STATUS:
3643                         case ISTATE_SEND_STATUS_RECOVERY:
3644                                 spin_unlock_bh(&cmd->istate_lock);
3645                                 use_misc = 1;
3646                                 ret = iscsit_send_status(cmd, conn);
3647                                 break;
3648                         case ISTATE_SEND_LOGOUTRSP:
3649                                 spin_unlock_bh(&cmd->istate_lock);
3650                                 use_misc = 1;
3651                                 ret = iscsit_send_logout_response(cmd, conn);
3652                                 break;
3653                         case ISTATE_SEND_ASYNCMSG:
3654                                 spin_unlock_bh(&cmd->istate_lock);
3655                                 use_misc = 1;
3656                                 ret = iscsit_send_conn_drop_async_message(
3657                                                 cmd, conn);
3658                                 break;
3659                         case ISTATE_SEND_NOPIN:
3660                                 spin_unlock_bh(&cmd->istate_lock);
3661                                 use_misc = 1;
3662                                 ret = iscsit_send_nopin_response(cmd, conn);
3663                                 break;
3664                         case ISTATE_SEND_REJECT:
3665                                 spin_unlock_bh(&cmd->istate_lock);
3666                                 use_misc = 1;
3667                                 ret = iscsit_send_reject(cmd, conn);
3668                                 break;
3669                         case ISTATE_SEND_TASKMGTRSP:
3670                                 spin_unlock_bh(&cmd->istate_lock);
3671                                 use_misc = 1;
3672                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3673                                 if (ret != 0)
3674                                         break;
3675                                 ret = iscsit_tmr_post_handler(cmd, conn);
3676                                 if (ret != 0)
3677                                         iscsit_fall_back_to_erl0(conn->sess);
3678                                 break;
3679                         case ISTATE_SEND_TEXTRSP:
3680                                 spin_unlock_bh(&cmd->istate_lock);
3681                                 use_misc = 1;
3682                                 ret = iscsit_send_text_rsp(cmd, conn);
3683                                 break;
3684                         default:
3685                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3686                                         " 0x%08x, i_state: %d on CID: %hu\n",
3687                                         cmd->iscsi_opcode, cmd->init_task_tag,
3688                                         state, conn->cid);
3689                                 spin_unlock_bh(&cmd->istate_lock);
3690                                 goto transport_err;
3691                         }
3692                         if (ret < 0) {
3693                                 conn->tx_response_queue = 0;
3694                                 goto transport_err;
3695                         }
3696
3697                         se_cmd = &cmd->se_cmd;
3698
3699                         if (map_sg && !conn->conn_ops->IFMarker) {
3700                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3701                                         conn->tx_response_queue = 0;
3702                                         iscsit_tx_thread_wait_for_tcp(conn);
3703                                         iscsit_unmap_iovec(cmd);
3704                                         goto transport_err;
3705                                 }
3706                         } else {
3707                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3708                                         conn->tx_response_queue = 0;
3709                                         iscsit_tx_thread_wait_for_tcp(conn);
3710                                         iscsit_unmap_iovec(cmd);
3711                                         goto transport_err;
3712                                 }
3713                         }
3714                         map_sg = 0;
3715                         iscsit_unmap_iovec(cmd);
3716
3717                         spin_lock_bh(&cmd->istate_lock);
3718                         switch (state) {
3719                         case ISTATE_SEND_DATAIN:
3720                                 if (!eodr)
3721                                         goto check_rsp_state;
3722
3723                                 if (eodr == 1) {
3724                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3725                                         sent_status = 1;
3726                                         eodr = use_misc = 0;
3727                                 } else if (eodr == 2) {
3728                                         cmd->i_state = state =
3729                                                         ISTATE_SEND_STATUS;
3730                                         sent_status = 0;
3731                                         eodr = use_misc = 0;
3732                                         goto check_rsp_state;
3733                                 }
3734                                 break;
3735                         case ISTATE_SEND_STATUS:
3736                                 use_misc = 0;
3737                                 sent_status = 1;
3738                                 break;
3739                         case ISTATE_SEND_ASYNCMSG:
3740                         case ISTATE_SEND_NOPIN:
3741                         case ISTATE_SEND_STATUS_RECOVERY:
3742                         case ISTATE_SEND_TEXTRSP:
3743                                 use_misc = 0;
3744                                 sent_status = 1;
3745                                 break;
3746                         case ISTATE_SEND_REJECT:
3747                                 use_misc = 0;
3748                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3749                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3750                                         spin_unlock_bh(&cmd->istate_lock);
3751                                         complete(&cmd->reject_comp);
3752                                         goto transport_err;
3753                                 }
3754                                 complete(&cmd->reject_comp);
3755                                 break;
3756                         case ISTATE_SEND_TASKMGTRSP:
3757                                 use_misc = 0;
3758                                 sent_status = 1;
3759                                 break;
3760                         case ISTATE_SEND_LOGOUTRSP:
3761                                 spin_unlock_bh(&cmd->istate_lock);
3762                                 if (!iscsit_logout_post_handler(cmd, conn))
3763                                         goto restart;
3764                                 spin_lock_bh(&cmd->istate_lock);
3765                                 use_misc = 0;
3766                                 sent_status = 1;
3767                                 break;
3768                         default:
3769                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3770                                         " 0x%08x, i_state: %d on CID: %hu\n",
3771                                         cmd->iscsi_opcode, cmd->init_task_tag,
3772                                         cmd->i_state, conn->cid);
3773                                 spin_unlock_bh(&cmd->istate_lock);
3774                                 goto transport_err;
3775                         }
3776
3777                         if (sent_status) {
3778                                 cmd->i_state = ISTATE_SENT_STATUS;
3779                                 sent_status = 0;
3780                         }
3781                         spin_unlock_bh(&cmd->istate_lock);
3782
3783                         if (atomic_read(&conn->check_immediate_queue))
3784                                 goto get_immediate;
3785
3786                         goto get_response;
3787                 } else
3788                         conn->tx_response_queue = 0;
3789         }
3790
3791 transport_err:
3792         iscsit_take_action_for_connection_exit(conn);
3793         goto restart;
3794 out:
3795         return 0;
3796 }
3797
3798 int iscsi_target_rx_thread(void *arg)
3799 {
3800         int ret;
3801         u8 buffer[ISCSI_HDR_LEN], opcode;
3802         u32 checksum = 0, digest = 0;
3803         struct iscsi_conn *conn = NULL;
3804         struct iscsi_thread_set *ts = arg;
3805         struct kvec iov;
3806         /*
3807          * Allow ourselves to be interrupted by SIGINT so that a
3808          * connection recovery / failure event can be triggered externally.
3809          */
3810         allow_signal(SIGINT);
3811
3812 restart:
3813         conn = iscsi_rx_thread_pre_handler(ts);
3814         if (!conn)
3815                 goto out;
3816
3817         while (!kthread_should_stop()) {
3818                 /*
3819                  * Ensure that both TX and RX per connection kthreads
3820                  * are scheduled to run on the same CPU.
3821                  */
3822                 iscsit_thread_check_cpumask(conn, current, 0);
3823
3824                 memset(buffer, 0, ISCSI_HDR_LEN);
3825                 memset(&iov, 0, sizeof(struct kvec));
3826
3827                 iov.iov_base    = buffer;
3828                 iov.iov_len     = ISCSI_HDR_LEN;
3829
3830                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3831                 if (ret != ISCSI_HDR_LEN) {
3832                         iscsit_rx_thread_wait_for_tcp(conn);
3833                         goto transport_err;
3834                 }
3835
3836                 /*
3837                  * Set conn->bad_hdr for use with REJECT PDUs.
3838                  */
3839                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3840
3841                 if (conn->conn_ops->HeaderDigest) {
3842                         iov.iov_base    = &digest;
3843                         iov.iov_len     = ISCSI_CRC_LEN;
3844
3845                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3846                         if (ret != ISCSI_CRC_LEN) {
3847                                 iscsit_rx_thread_wait_for_tcp(conn);
3848                                 goto transport_err;
3849                         }
3850
3851                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3852                                         buffer, ISCSI_HDR_LEN,
3853                                         0, NULL, (u8 *)&checksum);
3854
3855                         if (digest != checksum) {
3856                                 pr_err("HeaderDigest CRC32C failed,"
3857                                         " received 0x%08x, computed 0x%08x\n",
3858                                         digest, checksum);
3859                                 /*
3860                                  * Set the PDU to 0xff so it will intentionally
3861                                  * hit default in the switch below.
3862                                  */
3863                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3864                                 spin_lock_bh(&conn->sess->session_stats_lock);
3865                                 conn->sess->conn_digest_errors++;
3866                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3867                         } else {
3868                                 pr_debug("Got HeaderDigest CRC32C"
3869                                                 " 0x%08x\n", checksum);
3870                         }
3871                 }
3872
3873                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3874                         goto transport_err;
3875
3876                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3877
3878                 if (conn->sess->sess_ops->SessionType &&
3879                    ((!(opcode & ISCSI_OP_TEXT)) ||
3880                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3881                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3882                         " while in Discovery Session, rejecting.\n", opcode);
3883                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3884                                         buffer, conn);
3885                         goto transport_err;
3886                 }
3887
3888                 switch (opcode) {
3889                 case ISCSI_OP_SCSI_CMD:
3890                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3891                                 goto transport_err;
3892                         break;
3893                 case ISCSI_OP_SCSI_DATA_OUT:
3894                         if (iscsit_handle_data_out(conn, buffer) < 0)
3895                                 goto transport_err;
3896                         break;
3897                 case ISCSI_OP_NOOP_OUT:
3898                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3899                                 goto transport_err;
3900                         break;
3901                 case ISCSI_OP_SCSI_TMFUNC:
3902                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3903                                 goto transport_err;
3904                         break;
3905                 case ISCSI_OP_TEXT:
3906                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3907                                 goto transport_err;
3908                         break;
3909                 case ISCSI_OP_LOGOUT:
3910                         ret = iscsit_handle_logout_cmd(conn, buffer);
3911                         if (ret > 0) {
3912                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3913                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3914                                 goto transport_err;
3915                         } else if (ret < 0)
3916                                 goto transport_err;
3917                         break;
3918                 case ISCSI_OP_SNACK:
3919                         if (iscsit_handle_snack(conn, buffer) < 0)
3920                                 goto transport_err;
3921                         break;
3922                 default:
3923                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3924                                         opcode);
3925                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3926                                 pr_err("Cannot recover from unknown"
3927                                 " opcode while ERL=0, closing iSCSI connection"
3928                                 ".\n");
3929                                 goto transport_err;
3930                         }
3931                         if (!conn->conn_ops->OFMarker) {
3932                                 pr_err("Unable to recover from unknown"
3933                                 " opcode while OFMarker=No, closing iSCSI"
3934                                         " connection.\n");
3935                                 goto transport_err;
3936                         }
3937                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3938                                 pr_err("Unable to recover from unknown"
3939                                         " opcode, closing iSCSI connection.\n");
3940                                 goto transport_err;
3941                         }
3942                         break;
3943                 }
3944         }
3945
3946 transport_err:
3947         if (!signal_pending(current))
3948                 atomic_set(&conn->transport_failed, 1);
3949         iscsit_take_action_for_connection_exit(conn);
3950         goto restart;
3951 out:
3952         return 0;
3953 }
3954
3955 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3956 {
3957         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3958         struct iscsi_session *sess = conn->sess;
3959         /*
3960          * We expect this function to only ever be called from either RX or TX
3961          * thread context via iscsit_close_connection() once the other context
3962          * has been reset -> returned sleeping pre-handler state.
3963          */
3964         spin_lock_bh(&conn->cmd_lock);
3965         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3966
3967                 list_del(&cmd->i_list);
3968                 spin_unlock_bh(&conn->cmd_lock);
3969
3970                 iscsit_increment_maxcmdsn(cmd, sess);
3971
3972                 iscsit_free_cmd(cmd);
3973
3974                 spin_lock_bh(&conn->cmd_lock);
3975         }
3976         spin_unlock_bh(&conn->cmd_lock);
3977 }
3978
3979 static void iscsit_stop_timers_for_cmds(
3980         struct iscsi_conn *conn)
3981 {
3982         struct iscsi_cmd *cmd;
3983
3984         spin_lock_bh(&conn->cmd_lock);
3985         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3986                 if (cmd->data_direction == DMA_TO_DEVICE)
3987                         iscsit_stop_dataout_timer(cmd);
3988         }
3989         spin_unlock_bh(&conn->cmd_lock);
3990 }
3991
3992 int iscsit_close_connection(
3993         struct iscsi_conn *conn)
3994 {
3995         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3996         struct iscsi_session    *sess = conn->sess;
3997
3998         pr_debug("Closing iSCSI connection CID %hu on SID:"
3999                 " %u\n", conn->cid, sess->sid);
4000         /*
4001          * Always up conn_logout_comp just in case the RX Thread is sleeping
4002          * and the logout response never got sent because the connection
4003          * failed.
4004          */
4005         complete(&conn->conn_logout_comp);
4006
4007         iscsi_release_thread_set(conn);
4008
4009         iscsit_stop_timers_for_cmds(conn);
4010         iscsit_stop_nopin_response_timer(conn);
4011         iscsit_stop_nopin_timer(conn);
4012         iscsit_free_queue_reqs_for_conn(conn);
4013
4014         /*
4015          * During Connection recovery drop unacknowledged out of order
4016          * commands for this connection, and prepare the other commands
4017          * for realligence.
4018          *
4019          * During normal operation clear the out of order commands (but
4020          * do not free the struct iscsi_ooo_cmdsn's) and release all
4021          * struct iscsi_cmds.
4022          */
4023         if (atomic_read(&conn->connection_recovery)) {
4024                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4025                 iscsit_prepare_cmds_for_realligance(conn);
4026         } else {
4027                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4028                 iscsit_release_commands_from_conn(conn);
4029         }
4030
4031         /*
4032          * Handle decrementing session or connection usage count if
4033          * a logout response was not able to be sent because the
4034          * connection failed.  Fall back to Session Recovery here.
4035          */
4036         if (atomic_read(&conn->conn_logout_remove)) {
4037                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4038                         iscsit_dec_conn_usage_count(conn);
4039                         iscsit_dec_session_usage_count(sess);
4040                 }
4041                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4042                         iscsit_dec_conn_usage_count(conn);
4043
4044                 atomic_set(&conn->conn_logout_remove, 0);
4045                 atomic_set(&sess->session_reinstatement, 0);
4046                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4047         }
4048
4049         spin_lock_bh(&sess->conn_lock);
4050         list_del(&conn->conn_list);
4051
4052         /*
4053          * Attempt to let the Initiator know this connection failed by
4054          * sending an Connection Dropped Async Message on another
4055          * active connection.
4056          */
4057         if (atomic_read(&conn->connection_recovery))
4058                 iscsit_build_conn_drop_async_message(conn);
4059
4060         spin_unlock_bh(&sess->conn_lock);
4061
4062         /*
4063          * If connection reinstatement is being performed on this connection,
4064          * up the connection reinstatement semaphore that is being blocked on
4065          * in iscsit_cause_connection_reinstatement().
4066          */
4067         spin_lock_bh(&conn->state_lock);
4068         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4069                 spin_unlock_bh(&conn->state_lock);
4070                 complete(&conn->conn_wait_comp);
4071                 wait_for_completion(&conn->conn_post_wait_comp);
4072                 spin_lock_bh(&conn->state_lock);
4073         }
4074
4075         /*
4076          * If connection reinstatement is being performed on this connection
4077          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4078          * connection wait rcfr semaphore that is being blocked on
4079          * an iscsit_connection_reinstatement_rcfr().
4080          */
4081         if (atomic_read(&conn->connection_wait_rcfr)) {
4082                 spin_unlock_bh(&conn->state_lock);
4083                 complete(&conn->conn_wait_rcfr_comp);
4084                 wait_for_completion(&conn->conn_post_wait_comp);
4085                 spin_lock_bh(&conn->state_lock);
4086         }
4087         atomic_set(&conn->connection_reinstatement, 1);
4088         spin_unlock_bh(&conn->state_lock);
4089
4090         /*
4091          * If any other processes are accessing this connection pointer we
4092          * must wait until they have completed.
4093          */
4094         iscsit_check_conn_usage_count(conn);
4095
4096         if (conn->conn_rx_hash.tfm)
4097                 crypto_free_hash(conn->conn_rx_hash.tfm);
4098         if (conn->conn_tx_hash.tfm)
4099                 crypto_free_hash(conn->conn_tx_hash.tfm);
4100
4101         if (conn->conn_cpumask)
4102                 free_cpumask_var(conn->conn_cpumask);
4103
4104         kfree(conn->conn_ops);
4105         conn->conn_ops = NULL;
4106
4107         if (conn->sock) {
4108                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4109                         kfree(conn->sock->file);
4110                         conn->sock->file = NULL;
4111                 }
4112                 sock_release(conn->sock);
4113         }
4114         conn->thread_set = NULL;
4115
4116         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4117         conn->conn_state = TARG_CONN_STATE_FREE;
4118         kfree(conn);
4119
4120         spin_lock_bh(&sess->conn_lock);
4121         atomic_dec(&sess->nconn);
4122         pr_debug("Decremented iSCSI connection count to %hu from node:"
4123                 " %s\n", atomic_read(&sess->nconn),
4124                 sess->sess_ops->InitiatorName);
4125         /*
4126          * Make sure that if one connection fails in an non ERL=2 iSCSI
4127          * Session that they all fail.
4128          */
4129         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4130              !atomic_read(&sess->session_logout))
4131                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4132
4133         /*
4134          * If this was not the last connection in the session, and we are
4135          * performing session reinstatement or falling back to ERL=0, call
4136          * iscsit_stop_session() without sleeping to shutdown the other
4137          * active connections.
4138          */
4139         if (atomic_read(&sess->nconn)) {
4140                 if (!atomic_read(&sess->session_reinstatement) &&
4141                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4142                         spin_unlock_bh(&sess->conn_lock);
4143                         return 0;
4144                 }
4145                 if (!atomic_read(&sess->session_stop_active)) {
4146                         atomic_set(&sess->session_stop_active, 1);
4147                         spin_unlock_bh(&sess->conn_lock);
4148                         iscsit_stop_session(sess, 0, 0);
4149                         return 0;
4150                 }
4151                 spin_unlock_bh(&sess->conn_lock);
4152                 return 0;
4153         }
4154
4155         /*
4156          * If this was the last connection in the session and one of the
4157          * following is occurring:
4158          *
4159          * Session Reinstatement is not being performed, and are falling back
4160          * to ERL=0 call iscsit_close_session().
4161          *
4162          * Session Logout was requested.  iscsit_close_session() will be called
4163          * elsewhere.
4164          *
4165          * Session Continuation is not being performed, start the Time2Retain
4166          * handler and check if sleep_on_sess_wait_sem is active.
4167          */
4168         if (!atomic_read(&sess->session_reinstatement) &&
4169              atomic_read(&sess->session_fall_back_to_erl0)) {
4170                 spin_unlock_bh(&sess->conn_lock);
4171                 iscsit_close_session(sess);
4172
4173                 return 0;
4174         } else if (atomic_read(&sess->session_logout)) {
4175                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4176                 sess->session_state = TARG_SESS_STATE_FREE;
4177                 spin_unlock_bh(&sess->conn_lock);
4178
4179                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4180                         complete(&sess->session_wait_comp);
4181
4182                 return 0;
4183         } else {
4184                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4185                 sess->session_state = TARG_SESS_STATE_FAILED;
4186
4187                 if (!atomic_read(&sess->session_continuation)) {
4188                         spin_unlock_bh(&sess->conn_lock);
4189                         iscsit_start_time2retain_handler(sess);
4190                 } else
4191                         spin_unlock_bh(&sess->conn_lock);
4192
4193                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4194                         complete(&sess->session_wait_comp);
4195
4196                 return 0;
4197         }
4198         spin_unlock_bh(&sess->conn_lock);
4199
4200         return 0;
4201 }
4202
4203 int iscsit_close_session(struct iscsi_session *sess)
4204 {
4205         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4206         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4207
4208         if (atomic_read(&sess->nconn)) {
4209                 pr_err("%d connection(s) still exist for iSCSI session"
4210                         " to %s\n", atomic_read(&sess->nconn),
4211                         sess->sess_ops->InitiatorName);
4212                 BUG();
4213         }
4214
4215         spin_lock_bh(&se_tpg->session_lock);
4216         atomic_set(&sess->session_logout, 1);
4217         atomic_set(&sess->session_reinstatement, 1);
4218         iscsit_stop_time2retain_timer(sess);
4219         spin_unlock_bh(&se_tpg->session_lock);
4220
4221         /*
4222          * transport_deregister_session_configfs() will clear the
4223          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4224          * can be setting it again with __transport_register_session() in
4225          * iscsi_post_login_handler() again after the iscsit_stop_session()
4226          * completes in iscsi_np context.
4227          */
4228         transport_deregister_session_configfs(sess->se_sess);
4229
4230         /*
4231          * If any other processes are accessing this session pointer we must
4232          * wait until they have completed.  If we are in an interrupt (the
4233          * time2retain handler) and contain and active session usage count we
4234          * restart the timer and exit.
4235          */
4236         if (!in_interrupt()) {
4237                 if (iscsit_check_session_usage_count(sess) == 1)
4238                         iscsit_stop_session(sess, 1, 1);
4239         } else {
4240                 if (iscsit_check_session_usage_count(sess) == 2) {
4241                         atomic_set(&sess->session_logout, 0);
4242                         iscsit_start_time2retain_handler(sess);
4243                         return 0;
4244                 }
4245         }
4246
4247         transport_deregister_session(sess->se_sess);
4248
4249         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4250                 iscsit_free_connection_recovery_entires(sess);
4251
4252         iscsit_free_all_ooo_cmdsns(sess);
4253
4254         spin_lock_bh(&se_tpg->session_lock);
4255         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4256         sess->session_state = TARG_SESS_STATE_FREE;
4257         pr_debug("Released iSCSI session from node: %s\n",
4258                         sess->sess_ops->InitiatorName);
4259         tpg->nsessions--;
4260         if (tpg->tpg_tiqn)
4261                 tpg->tpg_tiqn->tiqn_nsessions--;
4262
4263         pr_debug("Decremented number of active iSCSI Sessions on"
4264                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4265
4266         spin_lock(&sess_idr_lock);
4267         idr_remove(&sess_idr, sess->session_index);
4268         spin_unlock(&sess_idr_lock);
4269
4270         kfree(sess->sess_ops);
4271         sess->sess_ops = NULL;
4272         spin_unlock_bh(&se_tpg->session_lock);
4273
4274         kfree(sess);
4275         return 0;
4276 }
4277
4278 static void iscsit_logout_post_handler_closesession(
4279         struct iscsi_conn *conn)
4280 {
4281         struct iscsi_session *sess = conn->sess;
4282
4283         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4284         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4285
4286         atomic_set(&conn->conn_logout_remove, 0);
4287         complete(&conn->conn_logout_comp);
4288
4289         iscsit_dec_conn_usage_count(conn);
4290         iscsit_stop_session(sess, 1, 1);
4291         iscsit_dec_session_usage_count(sess);
4292         iscsit_close_session(sess);
4293 }
4294
4295 static void iscsit_logout_post_handler_samecid(
4296         struct iscsi_conn *conn)
4297 {
4298         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4299         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4300
4301         atomic_set(&conn->conn_logout_remove, 0);
4302         complete(&conn->conn_logout_comp);
4303
4304         iscsit_cause_connection_reinstatement(conn, 1);
4305         iscsit_dec_conn_usage_count(conn);
4306 }
4307
4308 static void iscsit_logout_post_handler_diffcid(
4309         struct iscsi_conn *conn,
4310         u16 cid)
4311 {
4312         struct iscsi_conn *l_conn;
4313         struct iscsi_session *sess = conn->sess;
4314
4315         if (!sess)
4316                 return;
4317
4318         spin_lock_bh(&sess->conn_lock);
4319         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4320                 if (l_conn->cid == cid) {
4321                         iscsit_inc_conn_usage_count(l_conn);
4322                         break;
4323                 }
4324         }
4325         spin_unlock_bh(&sess->conn_lock);
4326
4327         if (!l_conn)
4328                 return;
4329
4330         if (l_conn->sock)
4331                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4332
4333         spin_lock_bh(&l_conn->state_lock);
4334         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4335         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4336         spin_unlock_bh(&l_conn->state_lock);
4337
4338         iscsit_cause_connection_reinstatement(l_conn, 1);
4339         iscsit_dec_conn_usage_count(l_conn);
4340 }
4341
4342 /*
4343  *      Return of 0 causes the TX thread to restart.
4344  */
4345 static int iscsit_logout_post_handler(
4346         struct iscsi_cmd *cmd,
4347         struct iscsi_conn *conn)
4348 {
4349         int ret = 0;
4350
4351         switch (cmd->logout_reason) {
4352         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4353                 switch (cmd->logout_response) {
4354                 case ISCSI_LOGOUT_SUCCESS:
4355                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4356                 default:
4357                         iscsit_logout_post_handler_closesession(conn);
4358                         break;
4359                 }
4360                 ret = 0;
4361                 break;
4362         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4363                 if (conn->cid == cmd->logout_cid) {
4364                         switch (cmd->logout_response) {
4365                         case ISCSI_LOGOUT_SUCCESS:
4366                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4367                         default:
4368                                 iscsit_logout_post_handler_samecid(conn);
4369                                 break;
4370                         }
4371                         ret = 0;
4372                 } else {
4373                         switch (cmd->logout_response) {
4374                         case ISCSI_LOGOUT_SUCCESS:
4375                                 iscsit_logout_post_handler_diffcid(conn,
4376                                         cmd->logout_cid);
4377                                 break;
4378                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4379                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4380                         default:
4381                                 break;
4382                         }
4383                         ret = 1;
4384                 }
4385                 break;
4386         case ISCSI_LOGOUT_REASON_RECOVERY:
4387                 switch (cmd->logout_response) {
4388                 case ISCSI_LOGOUT_SUCCESS:
4389                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4390                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4391                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4392                 default:
4393                         break;
4394                 }
4395                 ret = 1;
4396                 break;
4397         default:
4398                 break;
4399
4400         }
4401         return ret;
4402 }
4403
4404 void iscsit_fail_session(struct iscsi_session *sess)
4405 {
4406         struct iscsi_conn *conn;
4407
4408         spin_lock_bh(&sess->conn_lock);
4409         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4410                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4411                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4412         }
4413         spin_unlock_bh(&sess->conn_lock);
4414
4415         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4416         sess->session_state = TARG_SESS_STATE_FAILED;
4417 }
4418
4419 int iscsit_free_session(struct iscsi_session *sess)
4420 {
4421         u16 conn_count = atomic_read(&sess->nconn);
4422         struct iscsi_conn *conn, *conn_tmp = NULL;
4423         int is_last;
4424
4425         spin_lock_bh(&sess->conn_lock);
4426         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4427
4428         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4429                         conn_list) {
4430                 if (conn_count == 0)
4431                         break;
4432
4433                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4434                         is_last = 1;
4435                 } else {
4436                         iscsit_inc_conn_usage_count(conn_tmp);
4437                         is_last = 0;
4438                 }
4439                 iscsit_inc_conn_usage_count(conn);
4440
4441                 spin_unlock_bh(&sess->conn_lock);
4442                 iscsit_cause_connection_reinstatement(conn, 1);
4443                 spin_lock_bh(&sess->conn_lock);
4444
4445                 iscsit_dec_conn_usage_count(conn);
4446                 if (is_last == 0)
4447                         iscsit_dec_conn_usage_count(conn_tmp);
4448
4449                 conn_count--;
4450         }
4451
4452         if (atomic_read(&sess->nconn)) {
4453                 spin_unlock_bh(&sess->conn_lock);
4454                 wait_for_completion(&sess->session_wait_comp);
4455         } else
4456                 spin_unlock_bh(&sess->conn_lock);
4457
4458         iscsit_close_session(sess);
4459         return 0;
4460 }
4461
4462 void iscsit_stop_session(
4463         struct iscsi_session *sess,
4464         int session_sleep,
4465         int connection_sleep)
4466 {
4467         u16 conn_count = atomic_read(&sess->nconn);
4468         struct iscsi_conn *conn, *conn_tmp = NULL;
4469         int is_last;
4470
4471         spin_lock_bh(&sess->conn_lock);
4472         if (session_sleep)
4473                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4474
4475         if (connection_sleep) {
4476                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4477                                 conn_list) {
4478                         if (conn_count == 0)
4479                                 break;
4480
4481                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4482                                 is_last = 1;
4483                         } else {
4484                                 iscsit_inc_conn_usage_count(conn_tmp);
4485                                 is_last = 0;
4486                         }
4487                         iscsit_inc_conn_usage_count(conn);
4488
4489                         spin_unlock_bh(&sess->conn_lock);
4490                         iscsit_cause_connection_reinstatement(conn, 1);
4491                         spin_lock_bh(&sess->conn_lock);
4492
4493                         iscsit_dec_conn_usage_count(conn);
4494                         if (is_last == 0)
4495                                 iscsit_dec_conn_usage_count(conn_tmp);
4496                         conn_count--;
4497                 }
4498         } else {
4499                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4500                         iscsit_cause_connection_reinstatement(conn, 0);
4501         }
4502
4503         if (session_sleep && atomic_read(&sess->nconn)) {
4504                 spin_unlock_bh(&sess->conn_lock);
4505                 wait_for_completion(&sess->session_wait_comp);
4506         } else
4507                 spin_unlock_bh(&sess->conn_lock);
4508 }
4509
4510 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4511 {
4512         struct iscsi_session *sess;
4513         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4514         struct se_session *se_sess, *se_sess_tmp;
4515         int session_count = 0;
4516
4517         spin_lock_bh(&se_tpg->session_lock);
4518         if (tpg->nsessions && !force) {
4519                 spin_unlock_bh(&se_tpg->session_lock);
4520                 return -1;
4521         }
4522
4523         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4524                         sess_list) {
4525                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4526
4527                 spin_lock(&sess->conn_lock);
4528                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4529                     atomic_read(&sess->session_logout) ||
4530                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4531                         spin_unlock(&sess->conn_lock);
4532                         continue;
4533                 }
4534                 atomic_set(&sess->session_reinstatement, 1);
4535                 spin_unlock(&sess->conn_lock);
4536                 spin_unlock_bh(&se_tpg->session_lock);
4537
4538                 iscsit_free_session(sess);
4539                 spin_lock_bh(&se_tpg->session_lock);
4540
4541                 session_count++;
4542         }
4543         spin_unlock_bh(&se_tpg->session_lock);
4544
4545         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4546                         " Group: %hu\n", session_count, tpg->tpgt);
4547         return 0;
4548 }
4549
4550 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4551 MODULE_VERSION("4.1.x");
4552 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4553 MODULE_LICENSE("GPL");
4554
4555 module_init(iscsi_target_init_module);
4556 module_exit(iscsi_target_cleanup_module);