Pileus Git - ~andy/linux/blob - 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         struct iscsi_cmd *cmd = NULL;
1473         struct kvec *iov = NULL;
1474         struct iscsi_nopout *hdr;
1475
1476         hdr                     = (struct iscsi_nopout *) buf;
1477         payload_length          = ntoh24(hdr->dlength);
1478         hdr->itt                = be32_to_cpu(hdr->itt);
1479         hdr->ttt                = be32_to_cpu(hdr->ttt);
1480         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1481         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1482
1483         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1484                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1485                         " not set, protocol error.\n");
1486                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1487                                         buf, conn);
1488         }
1489
1490         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1491                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1492                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1493                         " error.\n", payload_length,
1494                         conn->conn_ops->MaxRecvDataSegmentLength);
1495                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1496                                         buf, conn);
1497         }
1498
1499         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1500                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1501                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1502                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1503                 payload_length);
1504         /*
1505          * This is not a response to a Unsolicited NopIN, which means
1506          * it can either be a NOPOUT ping request (with a valid ITT),
1507          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1508          * Either way, make sure we allocate an struct iscsi_cmd, as both
1509          * can contain ping data.
1510          */
1511         if (hdr->ttt == 0xFFFFFFFF) {
1512                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1513                 if (!cmd)
1514                         return iscsit_add_reject(
1515                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1516                                         1, buf, conn);
1517
1518                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1519                 cmd->i_state            = ISTATE_SEND_NOPIN;
1520                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1521                                                 1 : 0);
1522                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1523                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1524                 cmd->cmd_sn             = hdr->cmdsn;
1525                 cmd->exp_stat_sn        = hdr->exp_statsn;
1526                 cmd->data_direction     = DMA_NONE;
1527         }
1528
1529         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1530                 rx_size = payload_length;
1531                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1532                 if (!ping_data) {
1533                         pr_err("Unable to allocate memory for"
1534                                 " NOPOUT ping data.\n");
1535                         ret = -1;
1536                         goto out;
1537                 }
1538
1539                 iov = &cmd->iov_misc[0];
1540                 iov[niov].iov_base      = ping_data;
1541                 iov[niov++].iov_len     = payload_length;
1542
1543                 padding = ((-payload_length) & 3);
1544                 if (padding != 0) {
1545                         pr_debug("Receiving %u additional bytes"
1546                                 " for padding.\n", padding);
1547                         iov[niov].iov_base      = &cmd->pad_bytes;
1548                         iov[niov++].iov_len     = padding;
1549                         rx_size += padding;
1550                 }
1551                 if (conn->conn_ops->DataDigest) {
1552                         iov[niov].iov_base      = &checksum;
1553                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1554                         rx_size += ISCSI_CRC_LEN;
1555                 }
1556
1557                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1558                 if (rx_got != rx_size) {
1559                         ret = -1;
1560                         goto out;
1561                 }
1562
1563                 if (conn->conn_ops->DataDigest) {
1564                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1565                                         ping_data, payload_length,
1566                                         padding, cmd->pad_bytes,
1567                                         (u8 *)&data_crc);
1568
1569                         if (checksum != data_crc) {
1570                                 pr_err("Ping data CRC32C DataDigest"
1571                                 " 0x%08x does not match computed 0x%08x\n",
1572                                         checksum, data_crc);
1573                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1574                                         pr_err("Unable to recover from"
1575                                         " NOPOUT Ping DataCRC failure while in"
1576                                                 " ERL=0.\n");
1577                                         ret = -1;
1578                                         goto out;
1579                                 } else {
1580                                         /*
1581                                          * Silently drop this PDU and let the
1582                                          * initiator plug the CmdSN gap.
1583                                          */
1584                                         pr_debug("Dropping NOPOUT"
1585                                         " Command CmdSN: 0x%08x due to"
1586                                         " DataCRC error.\n", hdr->cmdsn);
1587                                         ret = 0;
1588                                         goto out;
1589                                 }
1590                         } else {
1591                                 pr_debug("Got CRC32C DataDigest"
1592                                 " 0x%08x for %u bytes of ping data.\n",
1593                                         checksum, payload_length);
1594                         }
1595                 }
1596
1597                 ping_data[payload_length] = '\0';
1598                 /*
1599                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1600                  */
1601                 cmd->buf_ptr = ping_data;
1602                 cmd->buf_ptr_size = payload_length;
1603
1604                 pr_debug("Got %u bytes of NOPOUT ping"
1605                         " data.\n", payload_length);
1606                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1607         }
1608
1609         if (hdr->itt != 0xFFFFFFFF) {
1610                 if (!cmd) {
1611                         pr_err("Checking CmdSN for NOPOUT,"
1612                                 " but cmd is NULL!\n");
1613                         return -1;
1614                 }
1615                 /*
1616                  * Initiator is expecting a NopIN ping reply,
1617                  */
1618                 spin_lock_bh(&conn->cmd_lock);
1619                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1620                 spin_unlock_bh(&conn->cmd_lock);
1621
1622                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1623
1624                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1625                         iscsit_add_cmd_to_response_queue(cmd, conn,
1626                                         cmd->i_state);
1627                         return 0;
1628                 }
1629
1630                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1631                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1632                         ret = 0;
1633                         goto ping_out;
1634                 }
1635                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1636                         return iscsit_add_reject_from_cmd(
1637                                         ISCSI_REASON_PROTOCOL_ERROR,
1638                                         1, 0, buf, cmd);
1639
1640                 return 0;
1641         }
1642
1643         if (hdr->ttt != 0xFFFFFFFF) {
1644                 /*
1645                  * This was a response to a unsolicited NOPIN ping.
1646                  */
1647                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1648                 if (!cmd)
1649                         return -1;
1650
1651                 iscsit_stop_nopin_response_timer(conn);
1652
1653                 cmd->i_state = ISTATE_REMOVE;
1654                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1655                 iscsit_start_nopin_timer(conn);
1656         } else {
1657                 /*
1658                  * Initiator is not expecting a NOPIN is response.
1659                  * Just ignore for now.
1660                  *
1661                  * iSCSI v19-91 10.18
1662                  * "A NOP-OUT may also be used to confirm a changed
1663                  *  ExpStatSN if another PDU will not be available
1664                  *  for a long time."
1665                  */
1666                 ret = 0;
1667                 goto out;
1668         }
1669
1670         return 0;
1671 out:
1672         if (cmd)
1673                 iscsit_release_cmd(cmd);
1674 ping_out:
1675         kfree(ping_data);
1676         return ret;
1677 }
1678
1679 static int iscsit_handle_task_mgt_cmd(
1680         struct iscsi_conn *conn,
1681         unsigned char *buf)
1682 {
1683         struct iscsi_cmd *cmd;
1684         struct se_tmr_req *se_tmr;
1685         struct iscsi_tmr_req *tmr_req;
1686         struct iscsi_tm *hdr;
1687         int out_of_order_cmdsn = 0;
1688         int ret;
1689         u8 function;
1690
1691         hdr                     = (struct iscsi_tm *) buf;
1692         hdr->itt                = be32_to_cpu(hdr->itt);
1693         hdr->rtt                = be32_to_cpu(hdr->rtt);
1694         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1695         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1696         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1697         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1698         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1699         function = hdr->flags;
1700
1701         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1702                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1703                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1704                 hdr->rtt, hdr->refcmdsn, conn->cid);
1705
1706         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1707             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1708              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1709                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1710                 hdr->rtt = ISCSI_RESERVED_TAG;
1711         }
1712
1713         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1714                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715                 pr_err("Task Management Request TASK_REASSIGN not"
1716                         " issued as immediate command, bad iSCSI Initiator"
1717                                 "implementation\n");
1718                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1719                                         buf, conn);
1720         }
1721         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1722             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1723                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1724
1725         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1726         if (!cmd)
1727                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1728                                         1, buf, conn);
1729
1730         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1731         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1732         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1733         cmd->init_task_tag      = hdr->itt;
1734         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1735         cmd->cmd_sn             = hdr->cmdsn;
1736         cmd->exp_stat_sn        = hdr->exp_statsn;
1737         se_tmr                  = cmd->se_cmd.se_tmr_req;
1738         tmr_req                 = cmd->tmr_req;
1739         /*
1740          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1741          */
1742         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1743                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1744                                                scsilun_to_int(&hdr->lun));
1745                 if (ret < 0) {
1746                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1747                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1748                         goto attach;
1749                 }
1750         }
1751
1752         switch (function) {
1753         case ISCSI_TM_FUNC_ABORT_TASK:
1754                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1755                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1756                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1757                         goto attach;
1758                 }
1759                 break;
1760         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1761         case ISCSI_TM_FUNC_CLEAR_ACA:
1762         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1763         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1764                 break;
1765         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1766                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1767                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1768                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1769                         goto attach;
1770                 }
1771                 break;
1772         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1773                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1774                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1775                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1776                         goto attach;
1777                 }
1778                 break;
1779         case ISCSI_TM_FUNC_TASK_REASSIGN:
1780                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1781                 /*
1782                  * Perform sanity checks on the ExpDataSN only if the
1783                  * TASK_REASSIGN was successful.
1784                  */
1785                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1786                         break;
1787
1788                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1789                         return iscsit_add_reject_from_cmd(
1790                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1791                                         buf, cmd);
1792                 break;
1793         default:
1794                 pr_err("Unknown TMR function: 0x%02x, protocol"
1795                         " error.\n", function);
1796                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1797                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1798                 goto attach;
1799         }
1800
1801         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1802             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1803                 se_tmr->call_transport = 1;
1804 attach:
1805         spin_lock_bh(&conn->cmd_lock);
1806         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1807         spin_unlock_bh(&conn->cmd_lock);
1808
1809         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1810                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1811                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1812                         out_of_order_cmdsn = 1;
1813                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1814                         return 0;
1815                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1816                         return iscsit_add_reject_from_cmd(
1817                                         ISCSI_REASON_PROTOCOL_ERROR,
1818                                         1, 0, buf, cmd);
1819         }
1820         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1821
1822         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1823                 return 0;
1824         /*
1825          * Found the referenced task, send to transport for processing.
1826          */
1827         if (se_tmr->call_transport)
1828                 return transport_generic_handle_tmr(&cmd->se_cmd);
1829
1830         /*
1831          * Could not find the referenced LUN, task, or Task Management
1832          * command not authorized or supported.  Change state and
1833          * let the tx_thread send the response.
1834          *
1835          * For connection recovery, this is also the default action for
1836          * TMR TASK_REASSIGN.
1837          */
1838         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1839         return 0;
1840 }
1841
1842 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1843 static int iscsit_handle_text_cmd(
1844         struct iscsi_conn *conn,
1845         unsigned char *buf)
1846 {
1847         char *text_ptr, *text_in;
1848         int cmdsn_ret, niov = 0, rx_got, rx_size;
1849         u32 checksum = 0, data_crc = 0, payload_length;
1850         u32 padding = 0, pad_bytes = 0, text_length = 0;
1851         struct iscsi_cmd *cmd;
1852         struct kvec iov[3];
1853         struct iscsi_text *hdr;
1854
1855         hdr                     = (struct iscsi_text *) buf;
1856         payload_length          = ntoh24(hdr->dlength);
1857         hdr->itt                = be32_to_cpu(hdr->itt);
1858         hdr->ttt                = be32_to_cpu(hdr->ttt);
1859         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1860         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1861
1862         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1863                 pr_err("Unable to accept text parameter length: %u"
1864                         "greater than MaxRecvDataSegmentLength %u.\n",
1865                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1866                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1867                                         buf, conn);
1868         }
1869
1870         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1871                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1872                 hdr->exp_statsn, payload_length);
1873
1874         rx_size = text_length = payload_length;
1875         if (text_length) {
1876                 text_in = kzalloc(text_length, GFP_KERNEL);
1877                 if (!text_in) {
1878                         pr_err("Unable to allocate memory for"
1879                                 " incoming text parameters\n");
1880                         return -1;
1881                 }
1882
1883                 memset(iov, 0, 3 * sizeof(struct kvec));
1884                 iov[niov].iov_base      = text_in;
1885                 iov[niov++].iov_len     = text_length;
1886
1887                 padding = ((-payload_length) & 3);
1888                 if (padding != 0) {
1889                         iov[niov].iov_base = &pad_bytes;
1890                         iov[niov++].iov_len  = padding;
1891                         rx_size += padding;
1892                         pr_debug("Receiving %u additional bytes"
1893                                         " for padding.\n", padding);
1894                 }
1895                 if (conn->conn_ops->DataDigest) {
1896                         iov[niov].iov_base      = &checksum;
1897                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1898                         rx_size += ISCSI_CRC_LEN;
1899                 }
1900
1901                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1902                 if (rx_got != rx_size) {
1903                         kfree(text_in);
1904                         return -1;
1905                 }
1906
1907                 if (conn->conn_ops->DataDigest) {
1908                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1909                                         text_in, text_length,
1910                                         padding, (u8 *)&pad_bytes,
1911                                         (u8 *)&data_crc);
1912
1913                         if (checksum != data_crc) {
1914                                 pr_err("Text data CRC32C DataDigest"
1915                                         " 0x%08x does not match computed"
1916                                         " 0x%08x\n", checksum, data_crc);
1917                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1918                                         pr_err("Unable to recover from"
1919                                         " Text Data digest failure while in"
1920                                                 " ERL=0.\n");
1921                                         kfree(text_in);
1922                                         return -1;
1923                                 } else {
1924                                         /*
1925                                          * Silently drop this PDU and let the
1926                                          * initiator plug the CmdSN gap.
1927                                          */
1928                                         pr_debug("Dropping Text"
1929                                         " Command CmdSN: 0x%08x due to"
1930                                         " DataCRC error.\n", hdr->cmdsn);
1931                                         kfree(text_in);
1932                                         return 0;
1933                                 }
1934                         } else {
1935                                 pr_debug("Got CRC32C DataDigest"
1936                                         " 0x%08x for %u bytes of text data.\n",
1937                                                 checksum, text_length);
1938                         }
1939                 }
1940                 text_in[text_length - 1] = '\0';
1941                 pr_debug("Successfully read %d bytes of text"
1942                                 " data.\n", text_length);
1943
1944                 if (strncmp("SendTargets", text_in, 11) != 0) {
1945                         pr_err("Received Text Data that is not"
1946                                 " SendTargets, cannot continue.\n");
1947                         kfree(text_in);
1948                         return -1;
1949                 }
1950                 text_ptr = strchr(text_in, '=');
1951                 if (!text_ptr) {
1952                         pr_err("No \"=\" separator found in Text Data,"
1953                                 "  cannot continue.\n");
1954                         kfree(text_in);
1955                         return -1;
1956                 }
1957                 if (strncmp("=All", text_ptr, 4) != 0) {
1958                         pr_err("Unable to locate All value for"
1959                                 " SendTargets key,  cannot continue.\n");
1960                         kfree(text_in);
1961                         return -1;
1962                 }
1963 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1964                 kfree(text_in);
1965         }
1966
1967         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1968         if (!cmd)
1969                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1970                                         1, buf, conn);
1971
1972         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1973         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1974         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1975         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1976         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1977         cmd->cmd_sn             = hdr->cmdsn;
1978         cmd->exp_stat_sn        = hdr->exp_statsn;
1979         cmd->data_direction     = DMA_NONE;
1980
1981         spin_lock_bh(&conn->cmd_lock);
1982         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1983         spin_unlock_bh(&conn->cmd_lock);
1984
1985         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1986
1987         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1988                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1989                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1990                         return iscsit_add_reject_from_cmd(
1991                                         ISCSI_REASON_PROTOCOL_ERROR,
1992                                         1, 0, buf, cmd);
1993
1994                 return 0;
1995         }
1996
1997         return iscsit_execute_cmd(cmd, 0);
1998 }
1999
2000 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2001 {
2002         struct iscsi_conn *conn_p;
2003         struct iscsi_session *sess = conn->sess;
2004
2005         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2006                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2007
2008         atomic_set(&sess->session_logout, 1);
2009         atomic_set(&conn->conn_logout_remove, 1);
2010         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2011
2012         iscsit_inc_conn_usage_count(conn);
2013         iscsit_inc_session_usage_count(sess);
2014
2015         spin_lock_bh(&sess->conn_lock);
2016         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2017                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2018                         continue;
2019
2020                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2021                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2022         }
2023         spin_unlock_bh(&sess->conn_lock);
2024
2025         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2026
2027         return 0;
2028 }
2029
2030 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2031 {
2032         struct iscsi_conn *l_conn;
2033         struct iscsi_session *sess = conn->sess;
2034
2035         pr_debug("Received logout request CLOSECONNECTION for CID:"
2036                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2037
2038         /*
2039          * A Logout Request with a CLOSECONNECTION reason code for a CID
2040          * can arrive on a connection with a differing CID.
2041          */
2042         if (conn->cid == cmd->logout_cid) {
2043                 spin_lock_bh(&conn->state_lock);
2044                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2045                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2046
2047                 atomic_set(&conn->conn_logout_remove, 1);
2048                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2049                 iscsit_inc_conn_usage_count(conn);
2050
2051                 spin_unlock_bh(&conn->state_lock);
2052         } else {
2053                 /*
2054                  * Handle all different cid CLOSECONNECTION requests in
2055                  * iscsit_logout_post_handler_diffcid() as to give enough
2056                  * time for any non immediate command's CmdSN to be
2057                  * acknowledged on the connection in question.
2058                  *
2059                  * Here we simply make sure the CID is still around.
2060                  */
2061                 l_conn = iscsit_get_conn_from_cid(sess,
2062                                 cmd->logout_cid);
2063                 if (!l_conn) {
2064                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2065                         iscsit_add_cmd_to_response_queue(cmd, conn,
2066                                         cmd->i_state);
2067                         return 0;
2068                 }
2069
2070                 iscsit_dec_conn_usage_count(l_conn);
2071         }
2072
2073         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2074
2075         return 0;
2076 }
2077
2078 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2079 {
2080         struct iscsi_session *sess = conn->sess;
2081
2082         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2083                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2084
2085         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2086                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2087                         " while ERL!=2.\n");
2088                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2089                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2090                 return 0;
2091         }
2092
2093         if (conn->cid == cmd->logout_cid) {
2094                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2095                         " with CID: %hu on CID: %hu, implementation error.\n",
2096                                 cmd->logout_cid, conn->cid);
2097                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2098                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2099                 return 0;
2100         }
2101
2102         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2103
2104         return 0;
2105 }
2106
2107 static int iscsit_handle_logout_cmd(
2108         struct iscsi_conn *conn,
2109         unsigned char *buf)
2110 {
2111         int cmdsn_ret, logout_remove = 0;
2112         u8 reason_code = 0;
2113         struct iscsi_cmd *cmd;
2114         struct iscsi_logout *hdr;
2115         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2116
2117         hdr                     = (struct iscsi_logout *) buf;
2118         reason_code             = (hdr->flags & 0x7f);
2119         hdr->itt                = be32_to_cpu(hdr->itt);
2120         hdr->cid                = be16_to_cpu(hdr->cid);
2121         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2122         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2123
2124         if (tiqn) {
2125                 spin_lock(&tiqn->logout_stats.lock);
2126                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2127                         tiqn->logout_stats.normal_logouts++;
2128                 else
2129                         tiqn->logout_stats.abnormal_logouts++;
2130                 spin_unlock(&tiqn->logout_stats.lock);
2131         }
2132
2133         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2134                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2135                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2136                 hdr->cid, conn->cid);
2137
2138         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2139                 pr_err("Received logout request on connection that"
2140                         " is not in logged in state, ignoring request.\n");
2141                 return 0;
2142         }
2143
2144         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2145         if (!cmd)
2146                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2147                                         buf, conn);
2148
2149         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2150         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2151         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2152         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2153         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2154         cmd->cmd_sn             = hdr->cmdsn;
2155         cmd->exp_stat_sn        = hdr->exp_statsn;
2156         cmd->logout_cid         = hdr->cid;
2157         cmd->logout_reason      = reason_code;
2158         cmd->data_direction     = DMA_NONE;
2159
2160         /*
2161          * We need to sleep in these cases (by returning 1) until the Logout
2162          * Response gets sent in the tx thread.
2163          */
2164         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2165            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2166             (hdr->cid == conn->cid)))
2167                 logout_remove = 1;
2168
2169         spin_lock_bh(&conn->cmd_lock);
2170         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2171         spin_unlock_bh(&conn->cmd_lock);
2172
2173         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2174                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2175
2176         /*
2177          * Immediate commands are executed, well, immediately.
2178          * Non-Immediate Logout Commands are executed in CmdSN order.
2179          */
2180         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2181                 int ret = iscsit_execute_cmd(cmd, 0);
2182
2183                 if (ret < 0)
2184                         return ret;
2185         } else {
2186                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2187                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2188                         logout_remove = 0;
2189                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2190                         return iscsit_add_reject_from_cmd(
2191                                 ISCSI_REASON_PROTOCOL_ERROR,
2192                                 1, 0, buf, cmd);
2193                 }
2194         }
2195
2196         return logout_remove;
2197 }
2198
2199 static int iscsit_handle_snack(
2200         struct iscsi_conn *conn,
2201         unsigned char *buf)
2202 {
2203         struct iscsi_snack *hdr;
2204
2205         hdr                     = (struct iscsi_snack *) buf;
2206         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2207         hdr->itt                = be32_to_cpu(hdr->itt);
2208         hdr->ttt                = be32_to_cpu(hdr->ttt);
2209         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2210         hdr->begrun             = be32_to_cpu(hdr->begrun);
2211         hdr->runlength          = be32_to_cpu(hdr->runlength);
2212
2213         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2214                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2215                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2216                         hdr->begrun, hdr->runlength, conn->cid);
2217
2218         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2219                 pr_err("Initiator sent SNACK request while in"
2220                         " ErrorRecoveryLevel=0.\n");
2221                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2222                                         buf, conn);
2223         }
2224         /*
2225          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2226          * call from inside iscsi_send_recovery_datain_or_r2t().
2227          */
2228         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2229         case 0:
2230                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2231                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2232         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2233                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2234                         hdr->begrun, hdr->runlength);
2235         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2236                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2237                         hdr->runlength);
2238         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2239                 /* FIXME: Support R-Data SNACK */
2240                 pr_err("R-Data SNACK Not Supported.\n");
2241                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2242                                         buf, conn);
2243         default:
2244                 pr_err("Unknown SNACK type 0x%02x, protocol"
2245                         " error.\n", hdr->flags & 0x0f);
2246                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2247                                         buf, conn);
2248         }
2249
2250         return 0;
2251 }
2252
2253 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2254 {
2255         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2256             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2257                 wait_for_completion_interruptible_timeout(
2258                                         &conn->rx_half_close_comp,
2259                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2260         }
2261 }
2262
2263 static int iscsit_handle_immediate_data(
2264         struct iscsi_cmd *cmd,
2265         unsigned char *buf,
2266         u32 length)
2267 {
2268         int iov_ret, rx_got = 0, rx_size = 0;
2269         u32 checksum, iov_count = 0, padding = 0;
2270         struct iscsi_conn *conn = cmd->conn;
2271         struct kvec *iov;
2272
2273         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2274         if (iov_ret < 0)
2275                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2276
2277         rx_size = length;
2278         iov_count = iov_ret;
2279         iov = &cmd->iov_data[0];
2280
2281         padding = ((-length) & 3);
2282         if (padding != 0) {
2283                 iov[iov_count].iov_base = cmd->pad_bytes;
2284                 iov[iov_count++].iov_len = padding;
2285                 rx_size += padding;
2286         }
2287
2288         if (conn->conn_ops->DataDigest) {
2289                 iov[iov_count].iov_base         = &checksum;
2290                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2291                 rx_size += ISCSI_CRC_LEN;
2292         }
2293
2294         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2295
2296         iscsit_unmap_iovec(cmd);
2297
2298         if (rx_got != rx_size) {
2299                 iscsit_rx_thread_wait_for_tcp(conn);
2300                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2301         }
2302
2303         if (conn->conn_ops->DataDigest) {
2304                 u32 data_crc;
2305
2306                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2307                                                     cmd->write_data_done, length, padding,
2308                                                     cmd->pad_bytes);
2309
2310                 if (checksum != data_crc) {
2311                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2312                                 " does not match computed 0x%08x\n", checksum,
2313                                 data_crc);
2314
2315                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2316                                 pr_err("Unable to recover from"
2317                                         " Immediate Data digest failure while"
2318                                         " in ERL=0.\n");
2319                                 iscsit_add_reject_from_cmd(
2320                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2321                                                 1, 0, buf, cmd);
2322                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2323                         } else {
2324                                 iscsit_add_reject_from_cmd(
2325                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2326                                                 0, 0, buf, cmd);
2327                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2328                         }
2329                 } else {
2330                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2331                                 " %u bytes of Immediate Data\n", checksum,
2332                                 length);
2333                 }
2334         }
2335
2336         cmd->write_data_done += length;
2337
2338         if (cmd->write_data_done == cmd->data_length) {
2339                 spin_lock_bh(&cmd->istate_lock);
2340                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2341                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2342                 spin_unlock_bh(&cmd->istate_lock);
2343         }
2344
2345         return IMMEDIATE_DATA_NORMAL_OPERATION;
2346 }
2347
2348 /*
2349  *      Called with sess->conn_lock held.
2350  */
2351 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2352         with active network interface */
2353 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2354 {
2355         struct iscsi_cmd *cmd;
2356         struct iscsi_conn *conn_p;
2357
2358         /*
2359          * Only send a Asynchronous Message on connections whos network
2360          * interface is still functional.
2361          */
2362         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2363                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2364                         iscsit_inc_conn_usage_count(conn_p);
2365                         break;
2366                 }
2367         }
2368
2369         if (!conn_p)
2370                 return;
2371
2372         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2373         if (!cmd) {
2374                 iscsit_dec_conn_usage_count(conn_p);
2375                 return;
2376         }
2377
2378         cmd->logout_cid = conn->cid;
2379         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2380         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2381
2382         spin_lock_bh(&conn_p->cmd_lock);
2383         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2384         spin_unlock_bh(&conn_p->cmd_lock);
2385
2386         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2387         iscsit_dec_conn_usage_count(conn_p);
2388 }
2389
2390 static int iscsit_send_conn_drop_async_message(
2391         struct iscsi_cmd *cmd,
2392         struct iscsi_conn *conn)
2393 {
2394         struct iscsi_async *hdr;
2395
2396         cmd->tx_size = ISCSI_HDR_LEN;
2397         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2398
2399         hdr                     = (struct iscsi_async *) cmd->pdu;
2400         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2401         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2402         cmd->init_task_tag      = 0xFFFFFFFF;
2403         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2404         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2405         cmd->stat_sn            = conn->stat_sn++;
2406         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2407         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2408         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2409         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2410         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2411         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2412         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2413
2414         if (conn->conn_ops->HeaderDigest) {
2415                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2416
2417                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2418                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2419                                 0, NULL, (u8 *)header_digest);
2420
2421                 cmd->tx_size += ISCSI_CRC_LEN;
2422                 pr_debug("Attaching CRC32C HeaderDigest to"
2423                         " Async Message 0x%08x\n", *header_digest);
2424         }
2425
2426         cmd->iov_misc[0].iov_base       = cmd->pdu;
2427         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2428         cmd->iov_misc_count             = 1;
2429
2430         pr_debug("Sending Connection Dropped Async Message StatSN:"
2431                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2432                         cmd->logout_cid, conn->cid);
2433         return 0;
2434 }
2435
2436 static int iscsit_send_data_in(
2437         struct iscsi_cmd *cmd,
2438         struct iscsi_conn *conn,
2439         int *eodr)
2440 {
2441         int iov_ret = 0, set_statsn = 0;
2442         u32 iov_count = 0, tx_size = 0;
2443         struct iscsi_datain datain;
2444         struct iscsi_datain_req *dr;
2445         struct iscsi_data_rsp *hdr;
2446         struct kvec *iov;
2447
2448         memset(&datain, 0, sizeof(struct iscsi_datain));
2449         dr = iscsit_get_datain_values(cmd, &datain);
2450         if (!dr) {
2451                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2452                                 cmd->init_task_tag);
2453                 return -1;
2454         }
2455
2456         /*
2457          * Be paranoid and double check the logic for now.
2458          */
2459         if ((datain.offset + datain.length) > cmd->data_length) {
2460                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2461                         " datain.length: %u exceeds cmd->data_length: %u\n",
2462                         cmd->init_task_tag, datain.offset, datain.length,
2463                                 cmd->data_length);
2464                 return -1;
2465         }
2466
2467         spin_lock_bh(&conn->sess->session_stats_lock);
2468         conn->sess->tx_data_octets += datain.length;
2469         if (conn->sess->se_sess->se_node_acl) {
2470                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2471                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2472                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2473         }
2474         spin_unlock_bh(&conn->sess->session_stats_lock);
2475         /*
2476          * Special case for successfully execution w/ both DATAIN
2477          * and Sense Data.
2478          */
2479         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2480             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2481                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2482         else {
2483                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2484                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2485                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2486                         cmd->stat_sn = conn->stat_sn++;
2487                         set_statsn = 1;
2488                 } else if (dr->dr_complete ==
2489                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2490                         set_statsn = 1;
2491         }
2492
2493         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2494         memset(hdr, 0, ISCSI_HDR_LEN);
2495         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2496         hdr->flags              = datain.flags;
2497         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2498                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2499                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2500                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2501                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2502                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2503                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2504                 }
2505         }
2506         hton24(hdr->dlength, datain.length);
2507         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2508                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2509                                 (struct scsi_lun *)&hdr->lun);
2510         else
2511                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2512
2513         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2514         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2515                                    cpu_to_be32(cmd->targ_xfer_tag) :
2516                                    0xFFFFFFFF;
2517         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2518                                                 0xFFFFFFFF;
2519         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2520         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2521         hdr->datasn             = cpu_to_be32(datain.data_sn);
2522         hdr->offset             = cpu_to_be32(datain.offset);
2523
2524         iov = &cmd->iov_data[0];
2525         iov[iov_count].iov_base = cmd->pdu;
2526         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2527         tx_size += ISCSI_HDR_LEN;
2528
2529         if (conn->conn_ops->HeaderDigest) {
2530                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2531
2532                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2533                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2534                                 0, NULL, (u8 *)header_digest);
2535
2536                 iov[0].iov_len += ISCSI_CRC_LEN;
2537                 tx_size += ISCSI_CRC_LEN;
2538
2539                 pr_debug("Attaching CRC32 HeaderDigest"
2540                         " for DataIN PDU 0x%08x\n", *header_digest);
2541         }
2542
2543         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2544         if (iov_ret < 0)
2545                 return -1;
2546
2547         iov_count += iov_ret;
2548         tx_size += datain.length;
2549
2550         cmd->padding = ((-datain.length) & 3);
2551         if (cmd->padding) {
2552                 iov[iov_count].iov_base         = cmd->pad_bytes;
2553                 iov[iov_count++].iov_len        = cmd->padding;
2554                 tx_size += cmd->padding;
2555
2556                 pr_debug("Attaching %u padding bytes\n",
2557                                 cmd->padding);
2558         }
2559         if (conn->conn_ops->DataDigest) {
2560                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2561                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2562
2563                 iov[iov_count].iov_base = &cmd->data_crc;
2564                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2565                 tx_size += ISCSI_CRC_LEN;
2566
2567                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2568                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2569         }
2570
2571         cmd->iov_data_count = iov_count;
2572         cmd->tx_size = tx_size;
2573
2574         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2575                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2576                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2577                 ntohl(hdr->offset), datain.length, conn->cid);
2578
2579         if (dr->dr_complete) {
2580                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2581                                 2 : 1;
2582                 iscsit_free_datain_req(cmd, dr);
2583         }
2584
2585         return 0;
2586 }
2587
2588 static int iscsit_send_logout_response(
2589         struct iscsi_cmd *cmd,
2590         struct iscsi_conn *conn)
2591 {
2592         int niov = 0, tx_size;
2593         struct iscsi_conn *logout_conn = NULL;
2594         struct iscsi_conn_recovery *cr = NULL;
2595         struct iscsi_session *sess = conn->sess;
2596         struct kvec *iov;
2597         struct iscsi_logout_rsp *hdr;
2598         /*
2599          * The actual shutting down of Sessions and/or Connections
2600          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2601          * is done in scsi_logout_post_handler().
2602          */
2603         switch (cmd->logout_reason) {
2604         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2605                 pr_debug("iSCSI session logout successful, setting"
2606                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2607                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2608                 break;
2609         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2610                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2611                         break;
2612                 /*
2613                  * For CLOSECONNECTION logout requests carrying
2614                  * a matching logout CID -> local CID, the reference
2615                  * for the local CID will have been incremented in
2616                  * iscsi_logout_closeconnection().
2617                  *
2618                  * For CLOSECONNECTION logout requests carrying
2619                  * a different CID than the connection it arrived
2620                  * on, the connection responding to cmd->logout_cid
2621                  * is stopped in iscsit_logout_post_handler_diffcid().
2622                  */
2623
2624                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2625                         " successful.\n", cmd->logout_cid, conn->cid);
2626                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2627                 break;
2628         case ISCSI_LOGOUT_REASON_RECOVERY:
2629                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2630                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2631                         break;
2632                 /*
2633                  * If the connection is still active from our point of view
2634                  * force connection recovery to occur.
2635                  */
2636                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2637                                 cmd->logout_cid);
2638                 if ((logout_conn)) {
2639                         iscsit_connection_reinstatement_rcfr(logout_conn);
2640                         iscsit_dec_conn_usage_count(logout_conn);
2641                 }
2642
2643                 cr = iscsit_get_inactive_connection_recovery_entry(
2644                                 conn->sess, cmd->logout_cid);
2645                 if (!cr) {
2646                         pr_err("Unable to locate CID: %hu for"
2647                         " REMOVECONNFORRECOVERY Logout Request.\n",
2648                                 cmd->logout_cid);
2649                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2650                         break;
2651                 }
2652
2653                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2654
2655                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2656                         " for recovery for CID: %hu on CID: %hu successful.\n",
2657                                 cmd->logout_cid, conn->cid);
2658                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2659                 break;
2660         default:
2661                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2662                                 cmd->logout_reason);
2663                 return -1;
2664         }
2665
2666         tx_size = ISCSI_HDR_LEN;
2667         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2668         memset(hdr, 0, ISCSI_HDR_LEN);
2669         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2670         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2671         hdr->response           = cmd->logout_response;
2672         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2673         cmd->stat_sn            = conn->stat_sn++;
2674         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2675
2676         iscsit_increment_maxcmdsn(cmd, conn->sess);
2677         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2678         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2679
2680         iov = &cmd->iov_misc[0];
2681         iov[niov].iov_base      = cmd->pdu;
2682         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2683
2684         if (conn->conn_ops->HeaderDigest) {
2685                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2686
2687                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2688                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2689                                 0, NULL, (u8 *)header_digest);
2690
2691                 iov[0].iov_len += ISCSI_CRC_LEN;
2692                 tx_size += ISCSI_CRC_LEN;
2693                 pr_debug("Attaching CRC32C HeaderDigest to"
2694                         " Logout Response 0x%08x\n", *header_digest);
2695         }
2696         cmd->iov_misc_count = niov;
2697         cmd->tx_size = tx_size;
2698
2699         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2700                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2701                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2702                 cmd->logout_cid, conn->cid);
2703
2704         return 0;
2705 }
2706
2707 /*
2708  *      Unsolicited NOPIN, either requesting a response or not.
2709  */
2710 static int iscsit_send_unsolicited_nopin(
2711         struct iscsi_cmd *cmd,
2712         struct iscsi_conn *conn,
2713         int want_response)
2714 {
2715         int tx_size = ISCSI_HDR_LEN;
2716         struct iscsi_nopin *hdr;
2717
2718         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2719         memset(hdr, 0, ISCSI_HDR_LEN);
2720         hdr->opcode             = ISCSI_OP_NOOP_IN;
2721         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2722         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2723         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2724         cmd->stat_sn            = conn->stat_sn;
2725         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2726         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2727         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2728
2729         if (conn->conn_ops->HeaderDigest) {
2730                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2731
2732                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2733                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2734                                 0, NULL, (u8 *)header_digest);
2735
2736                 tx_size += ISCSI_CRC_LEN;
2737                 pr_debug("Attaching CRC32C HeaderDigest to"
2738                         " NopIN 0x%08x\n", *header_digest);
2739         }
2740
2741         cmd->iov_misc[0].iov_base       = cmd->pdu;
2742         cmd->iov_misc[0].iov_len        = tx_size;
2743         cmd->iov_misc_count     = 1;
2744         cmd->tx_size            = tx_size;
2745
2746         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2747                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2748
2749         return 0;
2750 }
2751
2752 static int iscsit_send_nopin_response(
2753         struct iscsi_cmd *cmd,
2754         struct iscsi_conn *conn)
2755 {
2756         int niov = 0, tx_size;
2757         u32 padding = 0;
2758         struct kvec *iov;
2759         struct iscsi_nopin *hdr;
2760
2761         tx_size = ISCSI_HDR_LEN;
2762         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2763         memset(hdr, 0, ISCSI_HDR_LEN);
2764         hdr->opcode             = ISCSI_OP_NOOP_IN;
2765         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2766         hton24(hdr->dlength, cmd->buf_ptr_size);
2767         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2768         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2769         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2770         cmd->stat_sn            = conn->stat_sn++;
2771         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2772
2773         iscsit_increment_maxcmdsn(cmd, conn->sess);
2774         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2775         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2776
2777         iov = &cmd->iov_misc[0];
2778         iov[niov].iov_base      = cmd->pdu;
2779         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2780
2781         if (conn->conn_ops->HeaderDigest) {
2782                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2783
2784                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2785                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2786                                 0, NULL, (u8 *)header_digest);
2787
2788                 iov[0].iov_len += ISCSI_CRC_LEN;
2789                 tx_size += ISCSI_CRC_LEN;
2790                 pr_debug("Attaching CRC32C HeaderDigest"
2791                         " to NopIn 0x%08x\n", *header_digest);
2792         }
2793
2794         /*
2795          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2796          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2797          */
2798         if (cmd->buf_ptr_size) {
2799                 iov[niov].iov_base      = cmd->buf_ptr;
2800                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2801                 tx_size += cmd->buf_ptr_size;
2802
2803                 pr_debug("Echoing back %u bytes of ping"
2804                         " data.\n", cmd->buf_ptr_size);
2805
2806                 padding = ((-cmd->buf_ptr_size) & 3);
2807                 if (padding != 0) {
2808                         iov[niov].iov_base = &cmd->pad_bytes;
2809                         iov[niov++].iov_len = padding;
2810                         tx_size += padding;
2811                         pr_debug("Attaching %u additional"
2812                                 " padding bytes.\n", padding);
2813                 }
2814                 if (conn->conn_ops->DataDigest) {
2815                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2816                                 cmd->buf_ptr, cmd->buf_ptr_size,
2817                                 padding, (u8 *)&cmd->pad_bytes,
2818                                 (u8 *)&cmd->data_crc);
2819
2820                         iov[niov].iov_base = &cmd->data_crc;
2821                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2822                         tx_size += ISCSI_CRC_LEN;
2823                         pr_debug("Attached DataDigest for %u"
2824                                 " bytes of ping data, CRC 0x%08x\n",
2825                                 cmd->buf_ptr_size, cmd->data_crc);
2826                 }
2827         }
2828
2829         cmd->iov_misc_count = niov;
2830         cmd->tx_size = tx_size;
2831
2832         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2833                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2834                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2835
2836         return 0;
2837 }
2838
2839 int iscsit_send_r2t(
2840         struct iscsi_cmd *cmd,
2841         struct iscsi_conn *conn)
2842 {
2843         int tx_size = 0;
2844         struct iscsi_r2t *r2t;
2845         struct iscsi_r2t_rsp *hdr;
2846
2847         r2t = iscsit_get_r2t_from_list(cmd);
2848         if (!r2t)
2849                 return -1;
2850
2851         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2852         memset(hdr, 0, ISCSI_HDR_LEN);
2853         hdr->opcode             = ISCSI_OP_R2T;
2854         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2855         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2856                         (struct scsi_lun *)&hdr->lun);
2857         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2858         spin_lock_bh(&conn->sess->ttt_lock);
2859         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2860         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2861                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2862         spin_unlock_bh(&conn->sess->ttt_lock);
2863         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2864         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2865         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2866         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2867         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2868         hdr->data_offset        = cpu_to_be32(r2t->offset);
2869         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2870
2871         cmd->iov_misc[0].iov_base       = cmd->pdu;
2872         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2873         tx_size += ISCSI_HDR_LEN;
2874
2875         if (conn->conn_ops->HeaderDigest) {
2876                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2877
2878                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2879                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2880                                 0, NULL, (u8 *)header_digest);
2881
2882                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2883                 tx_size += ISCSI_CRC_LEN;
2884                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2885                         " PDU 0x%08x\n", *header_digest);
2886         }
2887
2888         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2889                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2890                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2891                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2892                         r2t->offset, r2t->xfer_len, conn->cid);
2893
2894         cmd->iov_misc_count = 1;
2895         cmd->tx_size = tx_size;
2896
2897         spin_lock_bh(&cmd->r2t_lock);
2898         r2t->sent_r2t = 1;
2899         spin_unlock_bh(&cmd->r2t_lock);
2900
2901         return 0;
2902 }
2903
2904 /*
2905  *      type 0: Normal Operation.
2906  *      type 1: Called from Storage Transport.
2907  *      type 2: Called from iscsi_task_reassign_complete_write() for
2908  *              connection recovery.
2909  */
2910 int iscsit_build_r2ts_for_cmd(
2911         struct iscsi_cmd *cmd,
2912         struct iscsi_conn *conn,
2913         int type)
2914 {
2915         int first_r2t = 1;
2916         u32 offset = 0, xfer_len = 0;
2917
2918         spin_lock_bh(&cmd->r2t_lock);
2919         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2920                 spin_unlock_bh(&cmd->r2t_lock);
2921                 return 0;
2922         }
2923
2924         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2925                 if (cmd->r2t_offset < cmd->write_data_done)
2926                         cmd->r2t_offset = cmd->write_data_done;
2927
2928         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2929                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2930                         offset = cmd->r2t_offset;
2931
2932                         if (first_r2t && (type == 2)) {
2933                                 xfer_len = ((offset +
2934                                              (conn->sess->sess_ops->MaxBurstLength -
2935                                              cmd->next_burst_len) >
2936                                              cmd->data_length) ?
2937                                             (cmd->data_length - offset) :
2938                                             (conn->sess->sess_ops->MaxBurstLength -
2939                                              cmd->next_burst_len));
2940                         } else {
2941                                 xfer_len = ((offset +
2942                                              conn->sess->sess_ops->MaxBurstLength) >
2943                                              cmd->data_length) ?
2944                                              (cmd->data_length - offset) :
2945                                              conn->sess->sess_ops->MaxBurstLength;
2946                         }
2947                         cmd->r2t_offset += xfer_len;
2948
2949                         if (cmd->r2t_offset == cmd->data_length)
2950                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2951                 } else {
2952                         struct iscsi_seq *seq;
2953
2954                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2955                         if (!seq) {
2956                                 spin_unlock_bh(&cmd->r2t_lock);
2957                                 return -1;
2958                         }
2959
2960                         offset = seq->offset;
2961                         xfer_len = seq->xfer_len;
2962
2963                         if (cmd->seq_send_order == cmd->seq_count)
2964                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2965                 }
2966                 cmd->outstanding_r2ts++;
2967                 first_r2t = 0;
2968
2969                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2970                         spin_unlock_bh(&cmd->r2t_lock);
2971                         return -1;
2972                 }
2973
2974                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2975                         break;
2976         }
2977         spin_unlock_bh(&cmd->r2t_lock);
2978
2979         return 0;
2980 }
2981
2982 static int iscsit_send_status(
2983         struct iscsi_cmd *cmd,
2984         struct iscsi_conn *conn)
2985 {
2986         u8 iov_count = 0, recovery;
2987         u32 padding = 0, tx_size = 0;
2988         struct iscsi_scsi_rsp *hdr;
2989         struct kvec *iov;
2990
2991         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
2992         if (!recovery)
2993                 cmd->stat_sn = conn->stat_sn++;
2994
2995         spin_lock_bh(&conn->sess->session_stats_lock);
2996         conn->sess->rsp_pdus++;
2997         spin_unlock_bh(&conn->sess->session_stats_lock);
2998
2999         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3000         memset(hdr, 0, ISCSI_HDR_LEN);
3001         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3002         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3003         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3004                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3005                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3006         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3007                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3008                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3009         }
3010         hdr->response           = cmd->iscsi_response;
3011         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3012         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3013         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3014
3015         iscsit_increment_maxcmdsn(cmd, conn->sess);
3016         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3017         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3018
3019         iov = &cmd->iov_misc[0];
3020         iov[iov_count].iov_base = cmd->pdu;
3021         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3022         tx_size += ISCSI_HDR_LEN;
3023
3024         /*
3025          * Attach SENSE DATA payload to iSCSI Response PDU
3026          */
3027         if (cmd->se_cmd.sense_buffer &&
3028            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3029             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3030                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3031                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3032                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3033                 iov[iov_count++].iov_len =
3034                                 (cmd->se_cmd.scsi_sense_length + padding);
3035                 tx_size += cmd->se_cmd.scsi_sense_length;
3036
3037                 if (padding) {
3038                         memset(cmd->se_cmd.sense_buffer +
3039                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3040                         tx_size += padding;
3041                         pr_debug("Adding %u bytes of padding to"
3042                                 " SENSE.\n", padding);
3043                 }
3044
3045                 if (conn->conn_ops->DataDigest) {
3046                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3047                                 cmd->se_cmd.sense_buffer,
3048                                 (cmd->se_cmd.scsi_sense_length + padding),
3049                                 0, NULL, (u8 *)&cmd->data_crc);
3050
3051                         iov[iov_count].iov_base    = &cmd->data_crc;
3052                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3053                         tx_size += ISCSI_CRC_LEN;
3054
3055                         pr_debug("Attaching CRC32 DataDigest for"
3056                                 " SENSE, %u bytes CRC 0x%08x\n",
3057                                 (cmd->se_cmd.scsi_sense_length + padding),
3058                                 cmd->data_crc);
3059                 }
3060
3061                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3062                                 " Response PDU\n",
3063                                 cmd->se_cmd.scsi_sense_length);
3064         }
3065
3066         if (conn->conn_ops->HeaderDigest) {
3067                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3068
3069                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3070                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3071                                 0, NULL, (u8 *)header_digest);
3072
3073                 iov[0].iov_len += ISCSI_CRC_LEN;
3074                 tx_size += ISCSI_CRC_LEN;
3075                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3076                                 " PDU 0x%08x\n", *header_digest);
3077         }
3078
3079         cmd->iov_misc_count = iov_count;
3080         cmd->tx_size = tx_size;
3081
3082         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3083                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3084                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3085                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3086
3087         return 0;
3088 }
3089
3090 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3091 {
3092         switch (se_tmr->response) {
3093         case TMR_FUNCTION_COMPLETE:
3094                 return ISCSI_TMF_RSP_COMPLETE;
3095         case TMR_TASK_DOES_NOT_EXIST:
3096                 return ISCSI_TMF_RSP_NO_TASK;
3097         case TMR_LUN_DOES_NOT_EXIST:
3098                 return ISCSI_TMF_RSP_NO_LUN;
3099         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3100                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3101         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3102                 return ISCSI_TMF_RSP_AUTH_FAILED;
3103         case TMR_FUNCTION_REJECTED:
3104         default:
3105                 return ISCSI_TMF_RSP_REJECTED;
3106         }
3107 }
3108
3109 static int iscsit_send_task_mgt_rsp(
3110         struct iscsi_cmd *cmd,
3111         struct iscsi_conn *conn)
3112 {
3113         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3114         struct iscsi_tm_rsp *hdr;
3115         u32 tx_size = 0;
3116
3117         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3118         memset(hdr, 0, ISCSI_HDR_LEN);
3119         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3120         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3121         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3122         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3123         cmd->stat_sn            = conn->stat_sn++;
3124         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3125
3126         iscsit_increment_maxcmdsn(cmd, conn->sess);
3127         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3128         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3129
3130         cmd->iov_misc[0].iov_base       = cmd->pdu;
3131         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3132         tx_size += ISCSI_HDR_LEN;
3133
3134         if (conn->conn_ops->HeaderDigest) {
3135                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3136
3137                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3138                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3139                                 0, NULL, (u8 *)header_digest);
3140
3141                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3142                 tx_size += ISCSI_CRC_LEN;
3143                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3144                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3145         }
3146
3147         cmd->iov_misc_count = 1;
3148         cmd->tx_size = tx_size;
3149
3150         pr_debug("Built Task Management Response ITT: 0x%08x,"
3151                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3152                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3153
3154         return 0;
3155 }
3156
3157 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3158 {
3159         bool ret = false;
3160
3161         if (np->np_sockaddr.ss_family == AF_INET6) {
3162                 const struct sockaddr_in6 sin6 = {
3163                         .sin6_addr = IN6ADDR_ANY_INIT };
3164                 struct sockaddr_in6 *sock_in6 =
3165                          (struct sockaddr_in6 *)&np->np_sockaddr;
3166
3167                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3168                                 sin6.sin6_addr.s6_addr, 16))
3169                         ret = true;
3170         } else {
3171                 struct sockaddr_in * sock_in =
3172                         (struct sockaddr_in *)&np->np_sockaddr;
3173
3174                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3175                         ret = true;
3176         }
3177
3178         return ret;
3179 }
3180
3181 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3182 {
3183         char *payload = NULL;
3184         struct iscsi_conn *conn = cmd->conn;
3185         struct iscsi_portal_group *tpg;
3186         struct iscsi_tiqn *tiqn;
3187         struct iscsi_tpg_np *tpg_np;
3188         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3189         unsigned char buf[256];
3190
3191         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3192                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3193
3194         memset(buf, 0, 256);
3195
3196         payload = kzalloc(buffer_len, GFP_KERNEL);
3197         if (!payload) {
3198                 pr_err("Unable to allocate memory for sendtargets"
3199                                 " response.\n");
3200                 return -ENOMEM;
3201         }
3202
3203         spin_lock(&tiqn_lock);
3204         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3205                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3206                 len += 1;
3207
3208                 if ((len + payload_len) > buffer_len) {
3209                         spin_unlock(&tiqn->tiqn_tpg_lock);
3210                         end_of_buf = 1;
3211                         goto eob;
3212                 }
3213                 memcpy(payload + payload_len, buf, len);
3214                 payload_len += len;
3215
3216                 spin_lock(&tiqn->tiqn_tpg_lock);
3217                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3218
3219                         spin_lock(&tpg->tpg_state_lock);
3220                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3221                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3222                                 spin_unlock(&tpg->tpg_state_lock);
3223                                 continue;
3224                         }
3225                         spin_unlock(&tpg->tpg_state_lock);
3226
3227                         spin_lock(&tpg->tpg_np_lock);
3228                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3229                                                 tpg_np_list) {
3230                                 struct iscsi_np *np = tpg_np->tpg_np;
3231                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3232
3233                                 len = sprintf(buf, "TargetAddress="
3234                                         "%s%s%s:%hu,%hu",
3235                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3236                                         "[" : "", (inaddr_any == false) ?
3237                                                 np->np_ip : conn->local_ip,
3238                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3239                                         "]" : "", (inaddr_any == false) ?
3240                                                 np->np_port : conn->local_port,
3241                                         tpg->tpgt);
3242                                 len += 1;
3243
3244                                 if ((len + payload_len) > buffer_len) {
3245                                         spin_unlock(&tpg->tpg_np_lock);
3246                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3247                                         end_of_buf = 1;
3248                                         goto eob;
3249                                 }
3250                                 memcpy(payload + payload_len, buf, len);
3251                                 payload_len += len;
3252                         }
3253                         spin_unlock(&tpg->tpg_np_lock);
3254                 }
3255                 spin_unlock(&tiqn->tiqn_tpg_lock);
3256 eob:
3257                 if (end_of_buf)
3258                         break;
3259         }
3260         spin_unlock(&tiqn_lock);
3261
3262         cmd->buf_ptr = payload;
3263
3264         return payload_len;
3265 }
3266
3267 /*
3268  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3269  *      MaxRecvDataSegmentLength.
3270  */
3271 static int iscsit_send_text_rsp(
3272         struct iscsi_cmd *cmd,
3273         struct iscsi_conn *conn)
3274 {
3275         struct iscsi_text_rsp *hdr;
3276         struct kvec *iov;
3277         u32 padding = 0, tx_size = 0;
3278         int text_length, iov_count = 0;
3279
3280         text_length = iscsit_build_sendtargets_response(cmd);
3281         if (text_length < 0)
3282                 return text_length;
3283
3284         padding = ((-text_length) & 3);
3285         if (padding != 0) {
3286                 memset(cmd->buf_ptr + text_length, 0, padding);
3287                 pr_debug("Attaching %u additional bytes for"
3288                         " padding.\n", padding);
3289         }
3290
3291         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3292         memset(hdr, 0, ISCSI_HDR_LEN);
3293         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3294         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3295         hton24(hdr->dlength, text_length);
3296         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3297         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3298         cmd->stat_sn            = conn->stat_sn++;
3299         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3300
3301         iscsit_increment_maxcmdsn(cmd, conn->sess);
3302         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3303         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3304
3305         iov = &cmd->iov_misc[0];
3306
3307         iov[iov_count].iov_base = cmd->pdu;
3308         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3309         iov[iov_count].iov_base = cmd->buf_ptr;
3310         iov[iov_count++].iov_len = text_length + padding;
3311
3312         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3313
3314         if (conn->conn_ops->HeaderDigest) {
3315                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3316
3317                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3318                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3319                                 0, NULL, (u8 *)header_digest);
3320
3321                 iov[0].iov_len += ISCSI_CRC_LEN;
3322                 tx_size += ISCSI_CRC_LEN;
3323                 pr_debug("Attaching CRC32 HeaderDigest for"
3324                         " Text Response PDU 0x%08x\n", *header_digest);
3325         }
3326
3327         if (conn->conn_ops->DataDigest) {
3328                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3329                                 cmd->buf_ptr, (text_length + padding),
3330                                 0, NULL, (u8 *)&cmd->data_crc);
3331
3332                 iov[iov_count].iov_base = &cmd->data_crc;
3333                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3334                 tx_size += ISCSI_CRC_LEN;
3335
3336                 pr_debug("Attaching DataDigest for %u bytes of text"
3337                         " data, CRC 0x%08x\n", (text_length + padding),
3338                         cmd->data_crc);
3339         }
3340
3341         cmd->iov_misc_count = iov_count;
3342         cmd->tx_size = tx_size;
3343
3344         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3345                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3346                         text_length, conn->cid);
3347         return 0;
3348 }
3349
3350 static int iscsit_send_reject(
3351         struct iscsi_cmd *cmd,
3352         struct iscsi_conn *conn)
3353 {
3354         u32 iov_count = 0, tx_size = 0;
3355         struct iscsi_reject *hdr;
3356         struct kvec *iov;
3357
3358         hdr                     = (struct iscsi_reject *) cmd->pdu;
3359         hdr->opcode             = ISCSI_OP_REJECT;
3360         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3361         hton24(hdr->dlength, ISCSI_HDR_LEN);
3362         cmd->stat_sn            = conn->stat_sn++;
3363         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3364         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3365         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3366
3367         iov = &cmd->iov_misc[0];
3368
3369         iov[iov_count].iov_base = cmd->pdu;
3370         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3371         iov[iov_count].iov_base = cmd->buf_ptr;
3372         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3373
3374         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3375
3376         if (conn->conn_ops->HeaderDigest) {
3377                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3378
3379                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3380                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3381                                 0, NULL, (u8 *)header_digest);
3382
3383                 iov[0].iov_len += ISCSI_CRC_LEN;
3384                 tx_size += ISCSI_CRC_LEN;
3385                 pr_debug("Attaching CRC32 HeaderDigest for"
3386                         " REJECT PDU 0x%08x\n", *header_digest);
3387         }
3388
3389         if (conn->conn_ops->DataDigest) {
3390                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3391                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3392                                 0, NULL, (u8 *)&cmd->data_crc);
3393
3394                 iov[iov_count].iov_base = &cmd->data_crc;
3395                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3396                 tx_size += ISCSI_CRC_LEN;
3397                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3398                                 " PDU 0x%08x\n", cmd->data_crc);
3399         }
3400
3401         cmd->iov_misc_count = iov_count;
3402         cmd->tx_size = tx_size;
3403
3404         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3405                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3406
3407         return 0;
3408 }
3409
3410 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3411 {
3412         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3413             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3414                 wait_for_completion_interruptible_timeout(
3415                                         &conn->tx_half_close_comp,
3416                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3417         }
3418 }
3419
3420 #ifdef CONFIG_SMP
3421
3422 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3423 {
3424         struct iscsi_thread_set *ts = conn->thread_set;
3425         int ord, cpu;
3426         /*
3427          * thread_id is assigned from iscsit_global->ts_bitmap from
3428          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3429          *
3430          * Here we use thread_id to determine which CPU that this
3431          * iSCSI connection's iscsi_thread_set will be scheduled to
3432          * execute upon.
3433          */
3434         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3435 #if 0
3436         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3437                         " thread_id: %d\n", ord, ts->thread_id);
3438 #endif
3439         for_each_online_cpu(cpu) {
3440                 if (ord-- == 0) {
3441                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3442                         return;
3443                 }
3444         }
3445         /*
3446          * This should never be reached..
3447          */
3448         dump_stack();
3449         cpumask_setall(conn->conn_cpumask);
3450 }
3451
3452 static inline void iscsit_thread_check_cpumask(
3453         struct iscsi_conn *conn,
3454         struct task_struct *p,
3455         int mode)
3456 {
3457         char buf[128];
3458         /*
3459          * mode == 1 signals iscsi_target_tx_thread() usage.
3460          * mode == 0 signals iscsi_target_rx_thread() usage.
3461          */
3462         if (mode == 1) {
3463                 if (!conn->conn_tx_reset_cpumask)
3464                         return;
3465                 conn->conn_tx_reset_cpumask = 0;
3466         } else {
3467                 if (!conn->conn_rx_reset_cpumask)
3468                         return;
3469                 conn->conn_rx_reset_cpumask = 0;
3470         }
3471         /*
3472          * Update the CPU mask for this single kthread so that
3473          * both TX and RX kthreads are scheduled to run on the
3474          * same CPU.
3475          */
3476         memset(buf, 0, 128);
3477         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3478 #if 0
3479         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3480                         " %s for %s\n", buf, p->comm);
3481 #endif
3482         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3483 }
3484
3485 #else
3486
3487 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3488 {
3489         return;
3490 }
3491
3492 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3493 #endif /* CONFIG_SMP */
3494
3495 int iscsi_target_tx_thread(void *arg)
3496 {
3497         u8 state;
3498         int eodr = 0;
3499         int ret = 0;
3500         int sent_status = 0;
3501         int use_misc = 0;
3502         int map_sg = 0;
3503         struct iscsi_cmd *cmd = NULL;
3504         struct iscsi_conn *conn;
3505         struct iscsi_queue_req *qr = NULL;
3506         struct iscsi_thread_set *ts = arg;
3507         /*
3508          * Allow ourselves to be interrupted by SIGINT so that a
3509          * connection recovery / failure event can be triggered externally.
3510          */
3511         allow_signal(SIGINT);
3512
3513 restart:
3514         conn = iscsi_tx_thread_pre_handler(ts);
3515         if (!conn)
3516                 goto out;
3517
3518         eodr = map_sg = ret = sent_status = use_misc = 0;
3519
3520         while (!kthread_should_stop()) {
3521                 /*
3522                  * Ensure that both TX and RX per connection kthreads
3523                  * are scheduled to run on the same CPU.
3524                  */
3525                 iscsit_thread_check_cpumask(conn, current, 1);
3526
3527                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3528
3529                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3530                      signal_pending(current))
3531                         goto transport_err;
3532
3533 get_immediate:
3534                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3535                 if (qr) {
3536                         atomic_set(&conn->check_immediate_queue, 0);
3537                         cmd = qr->cmd;
3538                         state = qr->state;
3539                         kmem_cache_free(lio_qr_cache, qr);
3540
3541                         spin_lock_bh(&cmd->istate_lock);
3542                         switch (state) {
3543                         case ISTATE_SEND_R2T:
3544                                 spin_unlock_bh(&cmd->istate_lock);
3545                                 ret = iscsit_send_r2t(cmd, conn);
3546                                 break;
3547                         case ISTATE_REMOVE:
3548                                 spin_unlock_bh(&cmd->istate_lock);
3549
3550                                 if (cmd->data_direction == DMA_TO_DEVICE)
3551                                         iscsit_stop_dataout_timer(cmd);
3552
3553                                 spin_lock_bh(&conn->cmd_lock);
3554                                 list_del(&cmd->i_list);
3555                                 spin_unlock_bh(&conn->cmd_lock);
3556
3557                                 iscsit_free_cmd(cmd);
3558                                 goto get_immediate;
3559                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3560                                 spin_unlock_bh(&cmd->istate_lock);
3561                                 iscsit_mod_nopin_response_timer(conn);
3562                                 ret = iscsit_send_unsolicited_nopin(cmd,
3563                                                 conn, 1);
3564                                 break;
3565                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3566                                 spin_unlock_bh(&cmd->istate_lock);
3567                                 ret = iscsit_send_unsolicited_nopin(cmd,
3568                                                 conn, 0);
3569                                 break;
3570                         default:
3571                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3572                                 " 0x%08x, i_state: %d on CID: %hu\n",
3573                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3574                                 conn->cid);
3575                                 spin_unlock_bh(&cmd->istate_lock);
3576                                 goto transport_err;
3577                         }
3578                         if (ret < 0) {
3579                                 conn->tx_immediate_queue = 0;
3580                                 goto transport_err;
3581                         }
3582
3583                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3584                                 conn->tx_immediate_queue = 0;
3585                                 iscsit_tx_thread_wait_for_tcp(conn);
3586                                 goto transport_err;
3587                         }
3588
3589                         spin_lock_bh(&cmd->istate_lock);
3590                         switch (state) {
3591                         case ISTATE_SEND_R2T:
3592                                 spin_unlock_bh(&cmd->istate_lock);
3593                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3594                                 iscsit_start_dataout_timer(cmd, conn);
3595                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3596                                 break;
3597                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3598                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3599                                 spin_unlock_bh(&cmd->istate_lock);
3600                                 break;
3601                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3602                                 cmd->i_state = ISTATE_SENT_STATUS;
3603                                 spin_unlock_bh(&cmd->istate_lock);
3604                                 break;
3605                         default:
3606                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3607                                         " 0x%08x, i_state: %d on CID: %hu\n",
3608                                         cmd->iscsi_opcode, cmd->init_task_tag,
3609                                         state, conn->cid);
3610                                 spin_unlock_bh(&cmd->istate_lock);
3611                                 goto transport_err;
3612                         }
3613                         goto get_immediate;
3614                 } else
3615                         conn->tx_immediate_queue = 0;
3616
3617 get_response:
3618                 qr = iscsit_get_cmd_from_response_queue(conn);
3619                 if (qr) {
3620                         cmd = qr->cmd;
3621                         state = qr->state;
3622                         kmem_cache_free(lio_qr_cache, qr);
3623
3624                         spin_lock_bh(&cmd->istate_lock);
3625 check_rsp_state:
3626                         switch (state) {
3627                         case ISTATE_SEND_DATAIN:
3628                                 spin_unlock_bh(&cmd->istate_lock);
3629                                 ret = iscsit_send_data_in(cmd, conn,
3630                                                           &eodr);
3631                                 map_sg = 1;
3632                                 break;
3633                         case ISTATE_SEND_STATUS:
3634                         case ISTATE_SEND_STATUS_RECOVERY:
3635                                 spin_unlock_bh(&cmd->istate_lock);
3636                                 use_misc = 1;
3637                                 ret = iscsit_send_status(cmd, conn);
3638                                 break;
3639                         case ISTATE_SEND_LOGOUTRSP:
3640                                 spin_unlock_bh(&cmd->istate_lock);
3641                                 use_misc = 1;
3642                                 ret = iscsit_send_logout_response(cmd, conn);
3643                                 break;
3644                         case ISTATE_SEND_ASYNCMSG:
3645                                 spin_unlock_bh(&cmd->istate_lock);
3646                                 use_misc = 1;
3647                                 ret = iscsit_send_conn_drop_async_message(
3648                                                 cmd, conn);
3649                                 break;
3650                         case ISTATE_SEND_NOPIN:
3651                                 spin_unlock_bh(&cmd->istate_lock);
3652                                 use_misc = 1;
3653                                 ret = iscsit_send_nopin_response(cmd, conn);
3654                                 break;
3655                         case ISTATE_SEND_REJECT:
3656                                 spin_unlock_bh(&cmd->istate_lock);
3657                                 use_misc = 1;
3658                                 ret = iscsit_send_reject(cmd, conn);
3659                                 break;
3660                         case ISTATE_SEND_TASKMGTRSP:
3661                                 spin_unlock_bh(&cmd->istate_lock);
3662                                 use_misc = 1;
3663                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3664                                 if (ret != 0)
3665                                         break;
3666                                 ret = iscsit_tmr_post_handler(cmd, conn);
3667                                 if (ret != 0)
3668                                         iscsit_fall_back_to_erl0(conn->sess);
3669                                 break;
3670                         case ISTATE_SEND_TEXTRSP:
3671                                 spin_unlock_bh(&cmd->istate_lock);
3672                                 use_misc = 1;
3673                                 ret = iscsit_send_text_rsp(cmd, conn);
3674                                 break;
3675                         default:
3676                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3677                                         " 0x%08x, i_state: %d on CID: %hu\n",
3678                                         cmd->iscsi_opcode, cmd->init_task_tag,
3679                                         state, conn->cid);
3680                                 spin_unlock_bh(&cmd->istate_lock);
3681                                 goto transport_err;
3682                         }
3683                         if (ret < 0) {
3684                                 conn->tx_response_queue = 0;
3685                                 goto transport_err;
3686                         }
3687
3688                         if (map_sg && !conn->conn_ops->IFMarker) {
3689                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3690                                         conn->tx_response_queue = 0;
3691                                         iscsit_tx_thread_wait_for_tcp(conn);
3692                                         iscsit_unmap_iovec(cmd);
3693                                         goto transport_err;
3694                                 }
3695                         } else {
3696                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3697                                         conn->tx_response_queue = 0;
3698                                         iscsit_tx_thread_wait_for_tcp(conn);
3699                                         iscsit_unmap_iovec(cmd);
3700                                         goto transport_err;
3701                                 }
3702                         }
3703                         map_sg = 0;
3704                         iscsit_unmap_iovec(cmd);
3705
3706                         spin_lock_bh(&cmd->istate_lock);
3707                         switch (state) {
3708                         case ISTATE_SEND_DATAIN:
3709                                 if (!eodr)
3710                                         goto check_rsp_state;
3711
3712                                 if (eodr == 1) {
3713                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3714                                         sent_status = 1;
3715                                         eodr = use_misc = 0;
3716                                 } else if (eodr == 2) {
3717                                         cmd->i_state = state =
3718                                                         ISTATE_SEND_STATUS;
3719                                         sent_status = 0;
3720                                         eodr = use_misc = 0;
3721                                         goto check_rsp_state;
3722                                 }
3723                                 break;
3724                         case ISTATE_SEND_STATUS:
3725                                 use_misc = 0;
3726                                 sent_status = 1;
3727                                 break;
3728                         case ISTATE_SEND_ASYNCMSG:
3729                         case ISTATE_SEND_NOPIN:
3730                         case ISTATE_SEND_STATUS_RECOVERY:
3731                         case ISTATE_SEND_TEXTRSP:
3732                                 use_misc = 0;
3733                                 sent_status = 1;
3734                                 break;
3735                         case ISTATE_SEND_REJECT:
3736                                 use_misc = 0;
3737                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3738                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3739                                         spin_unlock_bh(&cmd->istate_lock);
3740                                         complete(&cmd->reject_comp);
3741                                         goto transport_err;
3742                                 }
3743                                 complete(&cmd->reject_comp);
3744                                 break;
3745                         case ISTATE_SEND_TASKMGTRSP:
3746                                 use_misc = 0;
3747                                 sent_status = 1;
3748                                 break;
3749                         case ISTATE_SEND_LOGOUTRSP:
3750                                 spin_unlock_bh(&cmd->istate_lock);
3751                                 if (!iscsit_logout_post_handler(cmd, conn))
3752                                         goto restart;
3753                                 spin_lock_bh(&cmd->istate_lock);
3754                                 use_misc = 0;
3755                                 sent_status = 1;
3756                                 break;
3757                         default:
3758                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3759                                         " 0x%08x, i_state: %d on CID: %hu\n",
3760                                         cmd->iscsi_opcode, cmd->init_task_tag,
3761                                         cmd->i_state, conn->cid);
3762                                 spin_unlock_bh(&cmd->istate_lock);
3763                                 goto transport_err;
3764                         }
3765
3766                         if (sent_status) {
3767                                 cmd->i_state = ISTATE_SENT_STATUS;
3768                                 sent_status = 0;
3769                         }
3770                         spin_unlock_bh(&cmd->istate_lock);
3771
3772                         if (atomic_read(&conn->check_immediate_queue))
3773                                 goto get_immediate;
3774
3775                         goto get_response;
3776                 } else
3777                         conn->tx_response_queue = 0;
3778         }
3779
3780 transport_err:
3781         iscsit_take_action_for_connection_exit(conn);
3782         goto restart;
3783 out:
3784         return 0;
3785 }
3786
3787 int iscsi_target_rx_thread(void *arg)
3788 {
3789         int ret;
3790         u8 buffer[ISCSI_HDR_LEN], opcode;
3791         u32 checksum = 0, digest = 0;
3792         struct iscsi_conn *conn = NULL;
3793         struct iscsi_thread_set *ts = arg;
3794         struct kvec iov;
3795         /*
3796          * Allow ourselves to be interrupted by SIGINT so that a
3797          * connection recovery / failure event can be triggered externally.
3798          */
3799         allow_signal(SIGINT);
3800
3801 restart:
3802         conn = iscsi_rx_thread_pre_handler(ts);
3803         if (!conn)
3804                 goto out;
3805
3806         while (!kthread_should_stop()) {
3807                 /*
3808                  * Ensure that both TX and RX per connection kthreads
3809                  * are scheduled to run on the same CPU.
3810                  */
3811                 iscsit_thread_check_cpumask(conn, current, 0);
3812
3813                 memset(buffer, 0, ISCSI_HDR_LEN);
3814                 memset(&iov, 0, sizeof(struct kvec));
3815
3816                 iov.iov_base    = buffer;
3817                 iov.iov_len     = ISCSI_HDR_LEN;
3818
3819                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3820                 if (ret != ISCSI_HDR_LEN) {
3821                         iscsit_rx_thread_wait_for_tcp(conn);
3822                         goto transport_err;
3823                 }
3824
3825                 /*
3826                  * Set conn->bad_hdr for use with REJECT PDUs.
3827                  */
3828                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3829
3830                 if (conn->conn_ops->HeaderDigest) {
3831                         iov.iov_base    = &digest;
3832                         iov.iov_len     = ISCSI_CRC_LEN;
3833
3834                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3835                         if (ret != ISCSI_CRC_LEN) {
3836                                 iscsit_rx_thread_wait_for_tcp(conn);
3837                                 goto transport_err;
3838                         }
3839
3840                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3841                                         buffer, ISCSI_HDR_LEN,
3842                                         0, NULL, (u8 *)&checksum);
3843
3844                         if (digest != checksum) {
3845                                 pr_err("HeaderDigest CRC32C failed,"
3846                                         " received 0x%08x, computed 0x%08x\n",
3847                                         digest, checksum);
3848                                 /*
3849                                  * Set the PDU to 0xff so it will intentionally
3850                                  * hit default in the switch below.
3851                                  */
3852                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3853                                 spin_lock_bh(&conn->sess->session_stats_lock);
3854                                 conn->sess->conn_digest_errors++;
3855                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3856                         } else {
3857                                 pr_debug("Got HeaderDigest CRC32C"
3858                                                 " 0x%08x\n", checksum);
3859                         }
3860                 }
3861
3862                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3863                         goto transport_err;
3864
3865                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3866
3867                 if (conn->sess->sess_ops->SessionType &&
3868                    ((!(opcode & ISCSI_OP_TEXT)) ||
3869                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3870                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3871                         " while in Discovery Session, rejecting.\n", opcode);
3872                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3873                                         buffer, conn);
3874                         goto transport_err;
3875                 }
3876
3877                 switch (opcode) {
3878                 case ISCSI_OP_SCSI_CMD:
3879                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3880                                 goto transport_err;
3881                         break;
3882                 case ISCSI_OP_SCSI_DATA_OUT:
3883                         if (iscsit_handle_data_out(conn, buffer) < 0)
3884                                 goto transport_err;
3885                         break;
3886                 case ISCSI_OP_NOOP_OUT:
3887                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3888                                 goto transport_err;
3889                         break;
3890                 case ISCSI_OP_SCSI_TMFUNC:
3891                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3892                                 goto transport_err;
3893                         break;
3894                 case ISCSI_OP_TEXT:
3895                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3896                                 goto transport_err;
3897                         break;
3898                 case ISCSI_OP_LOGOUT:
3899                         ret = iscsit_handle_logout_cmd(conn, buffer);
3900                         if (ret > 0) {
3901                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3902                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3903                                 goto transport_err;
3904                         } else if (ret < 0)
3905                                 goto transport_err;
3906                         break;
3907                 case ISCSI_OP_SNACK:
3908                         if (iscsit_handle_snack(conn, buffer) < 0)
3909                                 goto transport_err;
3910                         break;
3911                 default:
3912                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3913                                         opcode);
3914                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3915                                 pr_err("Cannot recover from unknown"
3916                                 " opcode while ERL=0, closing iSCSI connection"
3917                                 ".\n");
3918                                 goto transport_err;
3919                         }
3920                         if (!conn->conn_ops->OFMarker) {
3921                                 pr_err("Unable to recover from unknown"
3922                                 " opcode while OFMarker=No, closing iSCSI"
3923                                         " connection.\n");
3924                                 goto transport_err;
3925                         }
3926                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3927                                 pr_err("Unable to recover from unknown"
3928                                         " opcode, closing iSCSI connection.\n");
3929                                 goto transport_err;
3930                         }
3931                         break;
3932                 }
3933         }
3934
3935 transport_err:
3936         if (!signal_pending(current))
3937                 atomic_set(&conn->transport_failed, 1);
3938         iscsit_take_action_for_connection_exit(conn);
3939         goto restart;
3940 out:
3941         return 0;
3942 }
3943
3944 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3945 {
3946         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3947         struct iscsi_session *sess = conn->sess;
3948         /*
3949          * We expect this function to only ever be called from either RX or TX
3950          * thread context via iscsit_close_connection() once the other context
3951          * has been reset -> returned sleeping pre-handler state.
3952          */
3953         spin_lock_bh(&conn->cmd_lock);
3954         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3955
3956                 list_del(&cmd->i_list);
3957                 spin_unlock_bh(&conn->cmd_lock);
3958
3959                 iscsit_increment_maxcmdsn(cmd, sess);
3960
3961                 iscsit_free_cmd(cmd);
3962
3963                 spin_lock_bh(&conn->cmd_lock);
3964         }
3965         spin_unlock_bh(&conn->cmd_lock);
3966 }
3967
3968 static void iscsit_stop_timers_for_cmds(
3969         struct iscsi_conn *conn)
3970 {
3971         struct iscsi_cmd *cmd;
3972
3973         spin_lock_bh(&conn->cmd_lock);
3974         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3975                 if (cmd->data_direction == DMA_TO_DEVICE)
3976                         iscsit_stop_dataout_timer(cmd);
3977         }
3978         spin_unlock_bh(&conn->cmd_lock);
3979 }
3980
3981 int iscsit_close_connection(
3982         struct iscsi_conn *conn)
3983 {
3984         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3985         struct iscsi_session    *sess = conn->sess;
3986
3987         pr_debug("Closing iSCSI connection CID %hu on SID:"
3988                 " %u\n", conn->cid, sess->sid);
3989         /*
3990          * Always up conn_logout_comp just in case the RX Thread is sleeping
3991          * and the logout response never got sent because the connection
3992          * failed.
3993          */
3994         complete(&conn->conn_logout_comp);
3995
3996         iscsi_release_thread_set(conn);
3997
3998         iscsit_stop_timers_for_cmds(conn);
3999         iscsit_stop_nopin_response_timer(conn);
4000         iscsit_stop_nopin_timer(conn);
4001         iscsit_free_queue_reqs_for_conn(conn);
4002
4003         /*
4004          * During Connection recovery drop unacknowledged out of order
4005          * commands for this connection, and prepare the other commands
4006          * for realligence.
4007          *
4008          * During normal operation clear the out of order commands (but
4009          * do not free the struct iscsi_ooo_cmdsn's) and release all
4010          * struct iscsi_cmds.
4011          */
4012         if (atomic_read(&conn->connection_recovery)) {
4013                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4014                 iscsit_prepare_cmds_for_realligance(conn);
4015         } else {
4016                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4017                 iscsit_release_commands_from_conn(conn);
4018         }
4019
4020         /*
4021          * Handle decrementing session or connection usage count if
4022          * a logout response was not able to be sent because the
4023          * connection failed.  Fall back to Session Recovery here.
4024          */
4025         if (atomic_read(&conn->conn_logout_remove)) {
4026                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4027                         iscsit_dec_conn_usage_count(conn);
4028                         iscsit_dec_session_usage_count(sess);
4029                 }
4030                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4031                         iscsit_dec_conn_usage_count(conn);
4032
4033                 atomic_set(&conn->conn_logout_remove, 0);
4034                 atomic_set(&sess->session_reinstatement, 0);
4035                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4036         }
4037
4038         spin_lock_bh(&sess->conn_lock);
4039         list_del(&conn->conn_list);
4040
4041         /*
4042          * Attempt to let the Initiator know this connection failed by
4043          * sending an Connection Dropped Async Message on another
4044          * active connection.
4045          */
4046         if (atomic_read(&conn->connection_recovery))
4047                 iscsit_build_conn_drop_async_message(conn);
4048
4049         spin_unlock_bh(&sess->conn_lock);
4050
4051         /*
4052          * If connection reinstatement is being performed on this connection,
4053          * up the connection reinstatement semaphore that is being blocked on
4054          * in iscsit_cause_connection_reinstatement().
4055          */
4056         spin_lock_bh(&conn->state_lock);
4057         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4058                 spin_unlock_bh(&conn->state_lock);
4059                 complete(&conn->conn_wait_comp);
4060                 wait_for_completion(&conn->conn_post_wait_comp);
4061                 spin_lock_bh(&conn->state_lock);
4062         }
4063
4064         /*
4065          * If connection reinstatement is being performed on this connection
4066          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4067          * connection wait rcfr semaphore that is being blocked on
4068          * an iscsit_connection_reinstatement_rcfr().
4069          */
4070         if (atomic_read(&conn->connection_wait_rcfr)) {
4071                 spin_unlock_bh(&conn->state_lock);
4072                 complete(&conn->conn_wait_rcfr_comp);
4073                 wait_for_completion(&conn->conn_post_wait_comp);
4074                 spin_lock_bh(&conn->state_lock);
4075         }
4076         atomic_set(&conn->connection_reinstatement, 1);
4077         spin_unlock_bh(&conn->state_lock);
4078
4079         /*
4080          * If any other processes are accessing this connection pointer we
4081          * must wait until they have completed.
4082          */
4083         iscsit_check_conn_usage_count(conn);
4084
4085         if (conn->conn_rx_hash.tfm)
4086                 crypto_free_hash(conn->conn_rx_hash.tfm);
4087         if (conn->conn_tx_hash.tfm)
4088                 crypto_free_hash(conn->conn_tx_hash.tfm);
4089
4090         if (conn->conn_cpumask)
4091                 free_cpumask_var(conn->conn_cpumask);
4092
4093         kfree(conn->conn_ops);
4094         conn->conn_ops = NULL;
4095
4096         if (conn->sock) {
4097                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4098                         kfree(conn->sock->file);
4099                         conn->sock->file = NULL;
4100                 }
4101                 sock_release(conn->sock);
4102         }
4103         conn->thread_set = NULL;
4104
4105         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4106         conn->conn_state = TARG_CONN_STATE_FREE;
4107         kfree(conn);
4108
4109         spin_lock_bh(&sess->conn_lock);
4110         atomic_dec(&sess->nconn);
4111         pr_debug("Decremented iSCSI connection count to %hu from node:"
4112                 " %s\n", atomic_read(&sess->nconn),
4113                 sess->sess_ops->InitiatorName);
4114         /*
4115          * Make sure that if one connection fails in an non ERL=2 iSCSI
4116          * Session that they all fail.
4117          */
4118         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4119              !atomic_read(&sess->session_logout))
4120                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4121
4122         /*
4123          * If this was not the last connection in the session, and we are
4124          * performing session reinstatement or falling back to ERL=0, call
4125          * iscsit_stop_session() without sleeping to shutdown the other
4126          * active connections.
4127          */
4128         if (atomic_read(&sess->nconn)) {
4129                 if (!atomic_read(&sess->session_reinstatement) &&
4130                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4131                         spin_unlock_bh(&sess->conn_lock);
4132                         return 0;
4133                 }
4134                 if (!atomic_read(&sess->session_stop_active)) {
4135                         atomic_set(&sess->session_stop_active, 1);
4136                         spin_unlock_bh(&sess->conn_lock);
4137                         iscsit_stop_session(sess, 0, 0);
4138                         return 0;
4139                 }
4140                 spin_unlock_bh(&sess->conn_lock);
4141                 return 0;
4142         }
4143
4144         /*
4145          * If this was the last connection in the session and one of the
4146          * following is occurring:
4147          *
4148          * Session Reinstatement is not being performed, and are falling back
4149          * to ERL=0 call iscsit_close_session().
4150          *
4151          * Session Logout was requested.  iscsit_close_session() will be called
4152          * elsewhere.
4153          *
4154          * Session Continuation is not being performed, start the Time2Retain
4155          * handler and check if sleep_on_sess_wait_sem is active.
4156          */
4157         if (!atomic_read(&sess->session_reinstatement) &&
4158              atomic_read(&sess->session_fall_back_to_erl0)) {
4159                 spin_unlock_bh(&sess->conn_lock);
4160                 target_put_session(sess->se_sess);
4161
4162                 return 0;
4163         } else if (atomic_read(&sess->session_logout)) {
4164                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4165                 sess->session_state = TARG_SESS_STATE_FREE;
4166                 spin_unlock_bh(&sess->conn_lock);
4167
4168                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4169                         complete(&sess->session_wait_comp);
4170
4171                 return 0;
4172         } else {
4173                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4174                 sess->session_state = TARG_SESS_STATE_FAILED;
4175
4176                 if (!atomic_read(&sess->session_continuation)) {
4177                         spin_unlock_bh(&sess->conn_lock);
4178                         iscsit_start_time2retain_handler(sess);
4179                 } else
4180                         spin_unlock_bh(&sess->conn_lock);
4181
4182                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4183                         complete(&sess->session_wait_comp);
4184
4185                 return 0;
4186         }
4187         spin_unlock_bh(&sess->conn_lock);
4188
4189         return 0;
4190 }
4191
4192 int iscsit_close_session(struct iscsi_session *sess)
4193 {
4194         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4195         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4196
4197         if (atomic_read(&sess->nconn)) {
4198                 pr_err("%d connection(s) still exist for iSCSI session"
4199                         " to %s\n", atomic_read(&sess->nconn),
4200                         sess->sess_ops->InitiatorName);
4201                 BUG();
4202         }
4203
4204         spin_lock_bh(&se_tpg->session_lock);
4205         atomic_set(&sess->session_logout, 1);
4206         atomic_set(&sess->session_reinstatement, 1);
4207         iscsit_stop_time2retain_timer(sess);
4208         spin_unlock_bh(&se_tpg->session_lock);
4209
4210         /*
4211          * transport_deregister_session_configfs() will clear the
4212          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4213          * can be setting it again with __transport_register_session() in
4214          * iscsi_post_login_handler() again after the iscsit_stop_session()
4215          * completes in iscsi_np context.
4216          */
4217         transport_deregister_session_configfs(sess->se_sess);
4218
4219         /*
4220          * If any other processes are accessing this session pointer we must
4221          * wait until they have completed.  If we are in an interrupt (the
4222          * time2retain handler) and contain and active session usage count we
4223          * restart the timer and exit.
4224          */
4225         if (!in_interrupt()) {
4226                 if (iscsit_check_session_usage_count(sess) == 1)
4227                         iscsit_stop_session(sess, 1, 1);
4228         } else {
4229                 if (iscsit_check_session_usage_count(sess) == 2) {
4230                         atomic_set(&sess->session_logout, 0);
4231                         iscsit_start_time2retain_handler(sess);
4232                         return 0;
4233                 }
4234         }
4235
4236         transport_deregister_session(sess->se_sess);
4237
4238         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4239                 iscsit_free_connection_recovery_entires(sess);
4240
4241         iscsit_free_all_ooo_cmdsns(sess);
4242
4243         spin_lock_bh(&se_tpg->session_lock);
4244         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4245         sess->session_state = TARG_SESS_STATE_FREE;
4246         pr_debug("Released iSCSI session from node: %s\n",
4247                         sess->sess_ops->InitiatorName);
4248         tpg->nsessions--;
4249         if (tpg->tpg_tiqn)
4250                 tpg->tpg_tiqn->tiqn_nsessions--;
4251
4252         pr_debug("Decremented number of active iSCSI Sessions on"
4253                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4254
4255         spin_lock(&sess_idr_lock);
4256         idr_remove(&sess_idr, sess->session_index);
4257         spin_unlock(&sess_idr_lock);
4258
4259         kfree(sess->sess_ops);
4260         sess->sess_ops = NULL;
4261         spin_unlock_bh(&se_tpg->session_lock);
4262
4263         kfree(sess);
4264         return 0;
4265 }
4266
4267 static void iscsit_logout_post_handler_closesession(
4268         struct iscsi_conn *conn)
4269 {
4270         struct iscsi_session *sess = conn->sess;
4271
4272         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4273         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4274
4275         atomic_set(&conn->conn_logout_remove, 0);
4276         complete(&conn->conn_logout_comp);
4277
4278         iscsit_dec_conn_usage_count(conn);
4279         iscsit_stop_session(sess, 1, 1);
4280         iscsit_dec_session_usage_count(sess);
4281         target_put_session(sess->se_sess);
4282 }
4283
4284 static void iscsit_logout_post_handler_samecid(
4285         struct iscsi_conn *conn)
4286 {
4287         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4288         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4289
4290         atomic_set(&conn->conn_logout_remove, 0);
4291         complete(&conn->conn_logout_comp);
4292
4293         iscsit_cause_connection_reinstatement(conn, 1);
4294         iscsit_dec_conn_usage_count(conn);
4295 }
4296
4297 static void iscsit_logout_post_handler_diffcid(
4298         struct iscsi_conn *conn,
4299         u16 cid)
4300 {
4301         struct iscsi_conn *l_conn;
4302         struct iscsi_session *sess = conn->sess;
4303
4304         if (!sess)
4305                 return;
4306
4307         spin_lock_bh(&sess->conn_lock);
4308         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4309                 if (l_conn->cid == cid) {
4310                         iscsit_inc_conn_usage_count(l_conn);
4311                         break;
4312                 }
4313         }
4314         spin_unlock_bh(&sess->conn_lock);
4315
4316         if (!l_conn)
4317                 return;
4318
4319         if (l_conn->sock)
4320                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4321
4322         spin_lock_bh(&l_conn->state_lock);
4323         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4324         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4325         spin_unlock_bh(&l_conn->state_lock);
4326
4327         iscsit_cause_connection_reinstatement(l_conn, 1);
4328         iscsit_dec_conn_usage_count(l_conn);
4329 }
4330
4331 /*
4332  *      Return of 0 causes the TX thread to restart.
4333  */
4334 static int iscsit_logout_post_handler(
4335         struct iscsi_cmd *cmd,
4336         struct iscsi_conn *conn)
4337 {
4338         int ret = 0;
4339
4340         switch (cmd->logout_reason) {
4341         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4342                 switch (cmd->logout_response) {
4343                 case ISCSI_LOGOUT_SUCCESS:
4344                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4345                 default:
4346                         iscsit_logout_post_handler_closesession(conn);
4347                         break;
4348                 }
4349                 ret = 0;
4350                 break;
4351         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4352                 if (conn->cid == cmd->logout_cid) {
4353                         switch (cmd->logout_response) {
4354                         case ISCSI_LOGOUT_SUCCESS:
4355                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4356                         default:
4357                                 iscsit_logout_post_handler_samecid(conn);
4358                                 break;
4359                         }
4360                         ret = 0;
4361                 } else {
4362                         switch (cmd->logout_response) {
4363                         case ISCSI_LOGOUT_SUCCESS:
4364                                 iscsit_logout_post_handler_diffcid(conn,
4365                                         cmd->logout_cid);
4366                                 break;
4367                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4368                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4369                         default:
4370                                 break;
4371                         }
4372                         ret = 1;
4373                 }
4374                 break;
4375         case ISCSI_LOGOUT_REASON_RECOVERY:
4376                 switch (cmd->logout_response) {
4377                 case ISCSI_LOGOUT_SUCCESS:
4378                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4379                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4380                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4381                 default:
4382                         break;
4383                 }
4384                 ret = 1;
4385                 break;
4386         default:
4387                 break;
4388
4389         }
4390         return ret;
4391 }
4392
4393 void iscsit_fail_session(struct iscsi_session *sess)
4394 {
4395         struct iscsi_conn *conn;
4396
4397         spin_lock_bh(&sess->conn_lock);
4398         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4399                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4400                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4401         }
4402         spin_unlock_bh(&sess->conn_lock);
4403
4404         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4405         sess->session_state = TARG_SESS_STATE_FAILED;
4406 }
4407
4408 int iscsit_free_session(struct iscsi_session *sess)
4409 {
4410         u16 conn_count = atomic_read(&sess->nconn);
4411         struct iscsi_conn *conn, *conn_tmp = NULL;
4412         int is_last;
4413
4414         spin_lock_bh(&sess->conn_lock);
4415         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4416
4417         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4418                         conn_list) {
4419                 if (conn_count == 0)
4420                         break;
4421
4422                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4423                         is_last = 1;
4424                 } else {
4425                         iscsit_inc_conn_usage_count(conn_tmp);
4426                         is_last = 0;
4427                 }
4428                 iscsit_inc_conn_usage_count(conn);
4429
4430                 spin_unlock_bh(&sess->conn_lock);
4431                 iscsit_cause_connection_reinstatement(conn, 1);
4432                 spin_lock_bh(&sess->conn_lock);
4433
4434                 iscsit_dec_conn_usage_count(conn);
4435                 if (is_last == 0)
4436                         iscsit_dec_conn_usage_count(conn_tmp);
4437
4438                 conn_count--;
4439         }
4440
4441         if (atomic_read(&sess->nconn)) {
4442                 spin_unlock_bh(&sess->conn_lock);
4443                 wait_for_completion(&sess->session_wait_comp);
4444         } else
4445                 spin_unlock_bh(&sess->conn_lock);
4446
4447         target_put_session(sess->se_sess);
4448         return 0;
4449 }
4450
4451 void iscsit_stop_session(
4452         struct iscsi_session *sess,
4453         int session_sleep,
4454         int connection_sleep)
4455 {
4456         u16 conn_count = atomic_read(&sess->nconn);
4457         struct iscsi_conn *conn, *conn_tmp = NULL;
4458         int is_last;
4459
4460         spin_lock_bh(&sess->conn_lock);
4461         if (session_sleep)
4462                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4463
4464         if (connection_sleep) {
4465                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4466                                 conn_list) {
4467                         if (conn_count == 0)
4468                                 break;
4469
4470                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4471                                 is_last = 1;
4472                         } else {
4473                                 iscsit_inc_conn_usage_count(conn_tmp);
4474                                 is_last = 0;
4475                         }
4476                         iscsit_inc_conn_usage_count(conn);
4477
4478                         spin_unlock_bh(&sess->conn_lock);
4479                         iscsit_cause_connection_reinstatement(conn, 1);
4480                         spin_lock_bh(&sess->conn_lock);
4481
4482                         iscsit_dec_conn_usage_count(conn);
4483                         if (is_last == 0)
4484                                 iscsit_dec_conn_usage_count(conn_tmp);
4485                         conn_count--;
4486                 }
4487         } else {
4488                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4489                         iscsit_cause_connection_reinstatement(conn, 0);
4490         }
4491
4492         if (session_sleep && atomic_read(&sess->nconn)) {
4493                 spin_unlock_bh(&sess->conn_lock);
4494                 wait_for_completion(&sess->session_wait_comp);
4495         } else
4496                 spin_unlock_bh(&sess->conn_lock);
4497 }
4498
4499 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4500 {
4501         struct iscsi_session *sess;
4502         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4503         struct se_session *se_sess, *se_sess_tmp;
4504         int session_count = 0;
4505
4506         spin_lock_bh(&se_tpg->session_lock);
4507         if (tpg->nsessions && !force) {
4508                 spin_unlock_bh(&se_tpg->session_lock);
4509                 return -1;
4510         }
4511
4512         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4513                         sess_list) {
4514                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4515
4516                 spin_lock(&sess->conn_lock);
4517                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4518                     atomic_read(&sess->session_logout) ||
4519                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4520                         spin_unlock(&sess->conn_lock);
4521                         continue;
4522                 }
4523                 atomic_set(&sess->session_reinstatement, 1);
4524                 spin_unlock(&sess->conn_lock);
4525                 spin_unlock_bh(&se_tpg->session_lock);
4526
4527                 iscsit_free_session(sess);
4528                 spin_lock_bh(&se_tpg->session_lock);
4529
4530                 session_count++;
4531         }
4532         spin_unlock_bh(&se_tpg->session_lock);
4533
4534         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4535                         " Group: %hu\n", session_count, tpg->tpgt);
4536         return 0;
4537 }
4538
4539 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4540 MODULE_VERSION("4.1.x");
4541 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4542 MODULE_LICENSE("GPL");
4543
4544 module_init(iscsi_target_init_module);
4545 module_exit(iscsi_target_cleanup_module);