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 <linux/idr.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/iscsi_proto.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_fabric.h>
  33 #include <target/target_core_configfs.h>
  34
  35 #include "iscsi_target_core.h"
  36 #include "iscsi_target_parameters.h"
  37 #include "iscsi_target_seq_pdu_list.h"
  38 #include "iscsi_target_tq.h"
  39 #include "iscsi_target_configfs.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include "iscsi_target_stat.h"
  51
  52 #include <target/iscsi/iscsi_transport.h>
  53
  54 static LIST_HEAD(g_tiqn_list);
  55 static LIST_HEAD(g_np_list);
  56 static DEFINE_SPINLOCK(tiqn_lock);
  57 static DEFINE_SPINLOCK(np_lock);
  58
  59 static struct idr tiqn_idr;
  60 struct idr sess_idr;
  61 struct mutex auth_id_lock;
  62 spinlock_t sess_idr_lock;
  63
  64 struct iscsit_global *iscsit_global;
  65
  66 struct kmem_cache *lio_cmd_cache;
  67 struct kmem_cache *lio_qr_cache;
  68 struct kmem_cache *lio_dr_cache;
  69 struct kmem_cache *lio_ooo_cache;
  70 struct kmem_cache *lio_r2t_cache;
  71
  72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  73                         struct iscsi_scsi_req *, u32);
  74
  75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  76 {
  77         struct iscsi_tiqn *tiqn = NULL;
  78
  79         spin_lock(&tiqn_lock);
  80         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  81                 if (!strcmp(tiqn->tiqn, buf)) {
  82
  83                         spin_lock(&tiqn->tiqn_state_lock);
  84                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  85                                 tiqn->tiqn_access_count++;
  86                                 spin_unlock(&tiqn->tiqn_state_lock);
  87                                 spin_unlock(&tiqn_lock);
  88                                 return tiqn;
  89                         }
  90                         spin_unlock(&tiqn->tiqn_state_lock);
  91                 }
  92         }
  93         spin_unlock(&tiqn_lock);
  94
  95         return NULL;
  96 }
  97
  98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  99 {
 100         spin_lock(&tiqn->tiqn_state_lock);
 101         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 102                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 103                 spin_unlock(&tiqn->tiqn_state_lock);
 104                 return 0;
 105         }
 106         spin_unlock(&tiqn->tiqn_state_lock);
 107
 108         return -1;
 109 }
 110
 111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 112 {
 113         spin_lock(&tiqn->tiqn_state_lock);
 114         tiqn->tiqn_access_count--;
 115         spin_unlock(&tiqn->tiqn_state_lock);
 116 }
 117
 118 /*
 119  * Note that IQN formatting is expected to be done in userspace, and
 120  * no explict IQN format checks are done here.
 121  */
 122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 123 {
 124         struct iscsi_tiqn *tiqn = NULL;
 125         int ret;
 126
 127         if (strlen(buf) >= ISCSI_IQN_LEN) {
 128                 pr_err("Target IQN exceeds %d bytes\n",
 129                                 ISCSI_IQN_LEN);
 130                 return ERR_PTR(-EINVAL);
 131         }
 132
 133         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 134         if (!tiqn) {
 135                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 136                 return ERR_PTR(-ENOMEM);
 137         }
 138
 139         sprintf(tiqn->tiqn, "%s", buf);
 140         INIT_LIST_HEAD(&tiqn->tiqn_list);
 141         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 142         spin_lock_init(&tiqn->tiqn_state_lock);
 143         spin_lock_init(&tiqn->tiqn_tpg_lock);
 144         spin_lock_init(&tiqn->sess_err_stats.lock);
 145         spin_lock_init(&tiqn->login_stats.lock);
 146         spin_lock_init(&tiqn->logout_stats.lock);
 147
 148         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 149
 150         idr_preload(GFP_KERNEL);
 151         spin_lock(&tiqn_lock);
 152
 153         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 154         if (ret < 0) {
 155                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 idr_preload_end();
 158                 kfree(tiqn);
 159                 return ERR_PTR(ret);
 160         }
 161         tiqn->tiqn_index = ret;
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163
 164         spin_unlock(&tiqn_lock);
 165         idr_preload_end();
 166
 167         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 168
 169         return tiqn;
 170
 171 }
 172
 173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 174 {
 175         /*
 176          * Wait for accesses to said struct iscsi_tiqn to end.
 177          */
 178         spin_lock(&tiqn->tiqn_state_lock);
 179         while (tiqn->tiqn_access_count != 0) {
 180                 spin_unlock(&tiqn->tiqn_state_lock);
 181                 msleep(10);
 182                 spin_lock(&tiqn->tiqn_state_lock);
 183         }
 184         spin_unlock(&tiqn->tiqn_state_lock);
 185 }
 186
 187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 188 {
 189         /*
 190          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 191          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 192          * attempts to access this struct iscsi_tiqn will fail from both transport
 193          * fabric and control code paths.
 194          */
 195         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 196                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 197                 return;
 198         }
 199
 200         iscsit_wait_for_tiqn(tiqn);
 201
 202         spin_lock(&tiqn_lock);
 203         list_del(&tiqn->tiqn_list);
 204         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 205         spin_unlock(&tiqn_lock);
 206
 207         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 208                         tiqn->tiqn);
 209         kfree(tiqn);
 210 }
 211
 212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 213 {
 214         int ret;
 215         /*
 216          * Determine if the network portal is accepting storage traffic.
 217          */
 218         spin_lock_bh(&np->np_thread_lock);
 219         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 220                 spin_unlock_bh(&np->np_thread_lock);
 221                 return -1;
 222         }
 223         if (np->np_login_tpg) {
 224                 pr_err("np->np_login_tpg() is not NULL!\n");
 225                 spin_unlock_bh(&np->np_thread_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&np->np_thread_lock);
 229         /*
 230          * Determine if the portal group is accepting storage traffic.
 231          */
 232         spin_lock_bh(&tpg->tpg_state_lock);
 233         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 234                 spin_unlock_bh(&tpg->tpg_state_lock);
 235                 return -1;
 236         }
 237         spin_unlock_bh(&tpg->tpg_state_lock);
 238
 239         /*
 240          * Here we serialize access across the TIQN+TPG Tuple.
 241          */
 242         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 243         if ((ret != 0) || signal_pending(current))
 244                 return -1;
 245
 246         spin_lock_bh(&np->np_thread_lock);
 247         np->np_login_tpg = tpg;
 248         spin_unlock_bh(&np->np_thread_lock);
 249
 250         return 0;
 251 }
 252
 253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 254 {
 255         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 256
 257         spin_lock_bh(&np->np_thread_lock);
 258         np->np_login_tpg = NULL;
 259         spin_unlock_bh(&np->np_thread_lock);
 260
 261         mutex_unlock(&tpg->np_login_lock);
 262
 263         if (tiqn)
 264                 iscsit_put_tiqn_for_login(tiqn);
 265
 266         return 0;
 267 }
 268
 269 bool iscsit_check_np_match(
 270         struct __kernel_sockaddr_storage *sockaddr,
 271         struct iscsi_np *np,
 272         int network_transport)
 273 {
 274         struct sockaddr_in *sock_in, *sock_in_e;
 275         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 276         bool ip_match = false;
 277         u16 port;
 278
 279         if (sockaddr->ss_family == AF_INET6) {
 280                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 281                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 282
 283                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 284                             &sock_in6_e->sin6_addr.in6_u,
 285                             sizeof(struct in6_addr)))
 286                         ip_match = true;
 287
 288                 port = ntohs(sock_in6->sin6_port);
 289         } else {
 290                 sock_in = (struct sockaddr_in *)sockaddr;
 291                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 292
 293                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 294                         ip_match = true;
 295
 296                 port = ntohs(sock_in->sin_port);
 297         }
 298
 299         if ((ip_match == true) && (np->np_port == port) &&
 300             (np->np_network_transport == network_transport))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static struct iscsi_np *iscsit_get_np(
 307         struct __kernel_sockaddr_storage *sockaddr,
 308         int network_transport)
 309 {
 310         struct iscsi_np *np;
 311         bool match;
 312
 313         spin_lock_bh(&np_lock);
 314         list_for_each_entry(np, &g_np_list, np_list) {
 315                 spin_lock(&np->np_thread_lock);
 316                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 317                         spin_unlock(&np->np_thread_lock);
 318                         continue;
 319                 }
 320
 321                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 322                 if (match == true) {
 323                         /*
 324                          * Increment the np_exports reference count now to
 325                          * prevent iscsit_del_np() below from being called
 326                          * while iscsi_tpg_add_network_portal() is called.
 327                          */
 328                         np->np_exports++;
 329                         spin_unlock(&np->np_thread_lock);
 330                         spin_unlock_bh(&np_lock);
 331                         return np;
 332                 }
 333                 spin_unlock(&np->np_thread_lock);
 334         }
 335         spin_unlock_bh(&np_lock);
 336
 337         return NULL;
 338 }
 339
 340 struct iscsi_np *iscsit_add_np(
 341         struct __kernel_sockaddr_storage *sockaddr,
 342         char *ip_str,
 343         int network_transport)
 344 {
 345         struct sockaddr_in *sock_in;
 346         struct sockaddr_in6 *sock_in6;
 347         struct iscsi_np *np;
 348         int ret;
 349         /*
 350          * Locate the existing struct iscsi_np if already active..
 351          */
 352         np = iscsit_get_np(sockaddr, network_transport);
 353         if (np)
 354                 return np;
 355
 356         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 357         if (!np) {
 358                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 359                 return ERR_PTR(-ENOMEM);
 360         }
 361
 362         np->np_flags |= NPF_IP_NETWORK;
 363         if (sockaddr->ss_family == AF_INET6) {
 364                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 365                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 366                 np->np_port = ntohs(sock_in6->sin6_port);
 367         } else {
 368                 sock_in = (struct sockaddr_in *)sockaddr;
 369                 sprintf(np->np_ip, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in->sin_port);
 371         }
 372
 373         np->np_network_transport = network_transport;
 374         spin_lock_init(&np->np_thread_lock);
 375         init_completion(&np->np_restart_comp);
 376         INIT_LIST_HEAD(&np->np_list);
 377
 378         ret = iscsi_target_setup_login_socket(np, sockaddr);
 379         if (ret != 0) {
 380                 kfree(np);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 return ERR_PTR(ret);
 390         }
 391         /*
 392          * Increment the np_exports reference count now to prevent
 393          * iscsit_del_np() below from being run while a new call to
 394          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 395          * active.  We don't need to hold np->np_thread_lock at this
 396          * point because iscsi_np has not been added to g_np_list yet.
 397          */
 398         np->np_exports = 1;
 399
 400         spin_lock_bh(&np_lock);
 401         list_add_tail(&np->np_list, &g_np_list);
 402         spin_unlock_bh(&np_lock);
 403
 404         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 405                 np->np_ip, np->np_port, np->np_transport->name);
 406
 407         return np;
 408 }
 409
 410 int iscsit_reset_np_thread(
 411         struct iscsi_np *np,
 412         struct iscsi_tpg_np *tpg_np,
 413         struct iscsi_portal_group *tpg)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (tpg && tpg_np) {
 417                 /*
 418                  * The reset operation need only be performed when the
 419                  * passed struct iscsi_portal_group has a login in progress
 420                  * to one of the network portals.
 421                  */
 422                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 423                         spin_unlock_bh(&np->np_thread_lock);
 424                         return 0;
 425                 }
 426         }
 427         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 return 0;
 430         }
 431         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 432
 433         if (np->np_thread) {
 434                 spin_unlock_bh(&np->np_thread_lock);
 435                 send_sig(SIGINT, np->np_thread, 1);
 436                 wait_for_completion(&np->np_restart_comp);
 437                 spin_lock_bh(&np->np_thread_lock);
 438         }
 439         spin_unlock_bh(&np->np_thread_lock);
 440
 441         return 0;
 442 }
 443
 444 static void iscsit_free_np(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448 }
 449
 450 int iscsit_del_np(struct iscsi_np *np)
 451 {
 452         spin_lock_bh(&np->np_thread_lock);
 453         np->np_exports--;
 454         if (np->np_exports) {
 455                 spin_unlock_bh(&np->np_thread_lock);
 456                 return 0;
 457         }
 458         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 459         spin_unlock_bh(&np->np_thread_lock);
 460
 461         if (np->np_thread) {
 462                 /*
 463                  * We need to send the signal to wakeup Linux/Net
 464                  * which may be sleeping in sock_accept()..
 465                  */
 466                 send_sig(SIGINT, np->np_thread, 1);
 467                 kthread_stop(np->np_thread);
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486
 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 488 {
 489         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 490         return 0;
 491 }
 492
 493 static struct iscsit_transport iscsi_target_transport = {
 494         .name                   = "iSCSI/TCP",
 495         .transport_type         = ISCSI_TCP,
 496         .owner                  = NULL,
 497         .iscsit_setup_np        = iscsit_setup_np,
 498         .iscsit_accept_np       = iscsit_accept_np,
 499         .iscsit_free_np         = iscsit_free_np,
 500         .iscsit_alloc_cmd       = iscsit_alloc_cmd,
 501         .iscsit_get_login_rx    = iscsit_get_login_rx,
 502         .iscsit_put_login_tx    = iscsit_put_login_tx,
 503         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 504         .iscsit_immediate_queue = iscsit_immediate_queue,
 505         .iscsit_response_queue  = iscsit_response_queue,
 506         .iscsit_queue_data_in   = iscsit_queue_rsp,
 507         .iscsit_queue_status    = iscsit_queue_rsp,
 508 };
 509
 510 static int __init iscsi_target_init_module(void)
 511 {
 512         int ret = 0;
 513
 514         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 515
 516         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 517         if (!iscsit_global) {
 518                 pr_err("Unable to allocate memory for iscsit_global\n");
 519                 return -1;
 520         }
 521         mutex_init(&auth_id_lock);
 522         spin_lock_init(&sess_idr_lock);
 523         idr_init(&tiqn_idr);
 524         idr_init(&sess_idr);
 525
 526         ret = iscsi_target_register_configfs();
 527         if (ret < 0)
 528                 goto out;
 529
 530         ret = iscsi_thread_set_init();
 531         if (ret < 0)
 532                 goto configfs_out;
 533
 534         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 535                         TARGET_THREAD_SET_COUNT) {
 536                 pr_err("iscsi_allocate_thread_sets() returned"
 537                         " unexpected value!\n");
 538                 goto ts_out1;
 539         }
 540
 541         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 542                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 543                         0, NULL);
 544         if (!lio_cmd_cache) {
 545                 pr_err("Unable to kmem_cache_create() for"
 546                                 " lio_cmd_cache\n");
 547                 goto ts_out2;
 548         }
 549
 550         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 551                         sizeof(struct iscsi_queue_req),
 552                         __alignof__(struct iscsi_queue_req), 0, NULL);
 553         if (!lio_qr_cache) {
 554                 pr_err("nable to kmem_cache_create() for"
 555                                 " lio_qr_cache\n");
 556                 goto cmd_out;
 557         }
 558
 559         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 560                         sizeof(struct iscsi_datain_req),
 561                         __alignof__(struct iscsi_datain_req), 0, NULL);
 562         if (!lio_dr_cache) {
 563                 pr_err("Unable to kmem_cache_create() for"
 564                                 " lio_dr_cache\n");
 565                 goto qr_out;
 566         }
 567
 568         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 569                         sizeof(struct iscsi_ooo_cmdsn),
 570                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 571         if (!lio_ooo_cache) {
 572                 pr_err("Unable to kmem_cache_create() for"
 573                                 " lio_ooo_cache\n");
 574                 goto dr_out;
 575         }
 576
 577         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 578                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 579                         0, NULL);
 580         if (!lio_r2t_cache) {
 581                 pr_err("Unable to kmem_cache_create() for"
 582                                 " lio_r2t_cache\n");
 583                 goto ooo_out;
 584         }
 585
 586         iscsit_register_transport(&iscsi_target_transport);
 587
 588         if (iscsit_load_discovery_tpg() < 0)
 589                 goto r2t_out;
 590
 591         return ret;
 592 r2t_out:
 593         kmem_cache_destroy(lio_r2t_cache);
 594 ooo_out:
 595         kmem_cache_destroy(lio_ooo_cache);
 596 dr_out:
 597         kmem_cache_destroy(lio_dr_cache);
 598 qr_out:
 599         kmem_cache_destroy(lio_qr_cache);
 600 cmd_out:
 601         kmem_cache_destroy(lio_cmd_cache);
 602 ts_out2:
 603         iscsi_deallocate_thread_sets();
 604 ts_out1:
 605         iscsi_thread_set_free();
 606 configfs_out:
 607         iscsi_target_deregister_configfs();
 608 out:
 609         kfree(iscsit_global);
 610         return -ENOMEM;
 611 }
 612
 613 static void __exit iscsi_target_cleanup_module(void)
 614 {
 615         iscsi_deallocate_thread_sets();
 616         iscsi_thread_set_free();
 617         iscsit_release_discovery_tpg();
 618         iscsit_unregister_transport(&iscsi_target_transport);
 619         kmem_cache_destroy(lio_cmd_cache);
 620         kmem_cache_destroy(lio_qr_cache);
 621         kmem_cache_destroy(lio_dr_cache);
 622         kmem_cache_destroy(lio_ooo_cache);
 623         kmem_cache_destroy(lio_r2t_cache);
 624
 625         iscsi_target_deregister_configfs();
 626
 627         kfree(iscsit_global);
 628 }
 629
 630 static int iscsit_add_reject(
 631         u8 reason,
 632         int fail_conn,
 633         unsigned char *buf,
 634         struct iscsi_conn *conn)
 635 {
 636         struct iscsi_cmd *cmd;
 637         struct iscsi_reject *hdr;
 638         int ret;
 639
 640         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 641         if (!cmd)
 642                 return -1;
 643
 644         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 645         if (fail_conn)
 646                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 647
 648         hdr     = (struct iscsi_reject *) cmd->pdu;
 649         hdr->reason = reason;
 650
 651         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 652         if (!cmd->buf_ptr) {
 653                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 654                 iscsit_free_cmd(cmd, false);
 655                 return -1;
 656         }
 657
 658         spin_lock_bh(&conn->cmd_lock);
 659         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 660         spin_unlock_bh(&conn->cmd_lock);
 661
 662         cmd->i_state = ISTATE_SEND_REJECT;
 663         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 664
 665         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 666         if (ret != 0)
 667                 return -1;
 668
 669         return (!fail_conn) ? 0 : -1;
 670 }
 671
 672 int iscsit_add_reject_from_cmd(
 673         u8 reason,
 674         int fail_conn,
 675         int add_to_conn,
 676         unsigned char *buf,
 677         struct iscsi_cmd *cmd)
 678 {
 679         struct iscsi_conn *conn;
 680         struct iscsi_reject *hdr;
 681         int ret;
 682
 683         if (!cmd->conn) {
 684                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 685                                 cmd->init_task_tag);
 686                 return -1;
 687         }
 688         conn = cmd->conn;
 689
 690         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 691         if (fail_conn)
 692                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 693
 694         hdr     = (struct iscsi_reject *) cmd->pdu;
 695         hdr->reason = reason;
 696
 697         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 698         if (!cmd->buf_ptr) {
 699                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 700                 iscsit_free_cmd(cmd, false);
 701                 return -1;
 702         }
 703
 704         if (add_to_conn) {
 705                 spin_lock_bh(&conn->cmd_lock);
 706                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 707                 spin_unlock_bh(&conn->cmd_lock);
 708         }
 709
 710         cmd->i_state = ISTATE_SEND_REJECT;
 711         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 712
 713         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 714         /*
 715          * Perform the kref_put now if se_cmd has already been setup by
 716          * scsit_setup_scsi_cmd()
 717          */
 718         if (cmd->se_cmd.se_tfo != NULL) {
 719                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 720                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 721         }
 722         if (ret != 0)
 723                 return -1;
 724
 725         return (!fail_conn) ? 0 : -1;
 726 }
 727 EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
 728
 729 /*
 730  * Map some portion of the allocated scatterlist to an iovec, suitable for
 731  * kernel sockets to copy data in/out.
 732  */
 733 static int iscsit_map_iovec(
 734         struct iscsi_cmd *cmd,
 735         struct kvec *iov,
 736         u32 data_offset,
 737         u32 data_length)
 738 {
 739         u32 i = 0;
 740         struct scatterlist *sg;
 741         unsigned int page_off;
 742
 743         /*
 744          * We know each entry in t_data_sg contains a page.
 745          */
 746         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 747         page_off = (data_offset % PAGE_SIZE);
 748
 749         cmd->first_data_sg = sg;
 750         cmd->first_data_sg_off = page_off;
 751
 752         while (data_length) {
 753                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 754
 755                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 756                 iov[i].iov_len = cur_len;
 757
 758                 data_length -= cur_len;
 759                 page_off = 0;
 760                 sg = sg_next(sg);
 761                 i++;
 762         }
 763
 764         cmd->kmapped_nents = i;
 765
 766         return i;
 767 }
 768
 769 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 770 {
 771         u32 i;
 772         struct scatterlist *sg;
 773
 774         sg = cmd->first_data_sg;
 775
 776         for (i = 0; i < cmd->kmapped_nents; i++)
 777                 kunmap(sg_page(&sg[i]));
 778 }
 779
 780 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 781 {
 782         struct iscsi_cmd *cmd;
 783
 784         conn->exp_statsn = exp_statsn;
 785
 786         if (conn->sess->sess_ops->RDMAExtensions)
 787                 return;
 788
 789         spin_lock_bh(&conn->cmd_lock);
 790         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 791                 spin_lock(&cmd->istate_lock);
 792                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 793                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 794                         cmd->i_state = ISTATE_REMOVE;
 795                         spin_unlock(&cmd->istate_lock);
 796                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 797                                                 cmd->i_state);
 798                         continue;
 799                 }
 800                 spin_unlock(&cmd->istate_lock);
 801         }
 802         spin_unlock_bh(&conn->cmd_lock);
 803 }
 804
 805 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 806 {
 807         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 808
 809         iov_count += ISCSI_IOV_DATA_BUFFER;
 810
 811         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 812         if (!cmd->iov_data) {
 813                 pr_err("Unable to allocate cmd->iov_data\n");
 814                 return -ENOMEM;
 815         }
 816
 817         cmd->orig_iov_data_count = iov_count;
 818         return 0;
 819 }
 820
 821 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 822                           unsigned char *buf)
 823 {
 824         int data_direction, payload_length;
 825         struct iscsi_scsi_req *hdr;
 826         int iscsi_task_attr;
 827         int sam_task_attr;
 828
 829         spin_lock_bh(&conn->sess->session_stats_lock);
 830         conn->sess->cmd_pdus++;
 831         if (conn->sess->se_sess->se_node_acl) {
 832                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 833                 conn->sess->se_sess->se_node_acl->num_cmds++;
 834                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 835         }
 836         spin_unlock_bh(&conn->sess->session_stats_lock);
 837
 838         hdr                     = (struct iscsi_scsi_req *) buf;
 839         payload_length          = ntoh24(hdr->dlength);
 840
 841         /* FIXME; Add checks for AdditionalHeaderSegment */
 842
 843         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 844             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 845                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 846                                 " not set. Bad iSCSI Initiator.\n");
 847                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 848                                 1, 1, buf, cmd);
 849         }
 850
 851         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 852              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 853                 /*
 854                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 855                  * that adds support for RESERVE/RELEASE.  There is a bug
 856                  * add with this new functionality that sets R/W bits when
 857                  * neither CDB carries any READ or WRITE datapayloads.
 858                  */
 859                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 860                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 861                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 862                         goto done;
 863                 }
 864
 865                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 866                         " set when Expected Data Transfer Length is 0 for"
 867                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 868                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 869                                 1, 1, buf, cmd);
 870         }
 871 done:
 872
 873         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 874             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 875                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 876                         " MUST be set if Expected Data Transfer Length is not 0."
 877                         " Bad iSCSI Initiator\n");
 878                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 879                                 1, 1, buf, cmd);
 880         }
 881
 882         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 883             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 884                 pr_err("Bidirectional operations not supported!\n");
 885                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 886                                 1, 1, buf, cmd);
 887         }
 888
 889         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 890                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 891                                 " Scsi Command PDU.\n");
 892                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 893                                 1, 1, buf, cmd);
 894         }
 895
 896         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 897                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 898                         " protocol error.\n", payload_length);
 899                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 900                                 1, 1, buf, cmd);
 901         }
 902
 903         if ((be32_to_cpu(hdr->data_length )== payload_length) &&
 904             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 905                 pr_err("Expected Data Transfer Length and Length of"
 906                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 907                         " bit is not set protocol error\n");
 908                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 909                                 1, 1, buf, cmd);
 910         }
 911
 912         if (payload_length > be32_to_cpu(hdr->data_length)) {
 913                 pr_err("DataSegmentLength: %u is greater than"
 914                         " EDTL: %u, protocol error.\n", payload_length,
 915                                 hdr->data_length);
 916                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 917                                 1, 1, buf, cmd);
 918         }
 919
 920         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 921                 pr_err("DataSegmentLength: %u is greater than"
 922                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 923                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 924                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 925                                 1, 1, buf, cmd);
 926         }
 927
 928         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 929                 pr_err("DataSegmentLength: %u is greater than"
 930                         " FirstBurstLength: %u, protocol error.\n",
 931                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 932                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 933                                 1, 1, buf, cmd);
 934         }
 935
 936         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 937                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 938                           DMA_NONE;
 939
 940         cmd->data_direction = data_direction;
 941         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 942         /*
 943          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 944          */
 945         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 946             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 947                 sam_task_attr = MSG_SIMPLE_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 949                 sam_task_attr = MSG_ORDERED_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 951                 sam_task_attr = MSG_HEAD_TAG;
 952         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 953                 sam_task_attr = MSG_ACA_TAG;
 954         else {
 955                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 956                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 957                 sam_task_attr = MSG_SIMPLE_TAG;
 958         }
 959
 960         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 961         cmd->i_state            = ISTATE_NEW_CMD;
 962         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 963         cmd->immediate_data     = (payload_length) ? 1 : 0;
 964         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 965                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 966         if (cmd->unsolicited_data)
 967                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 968
 969         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 970         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 971                 spin_lock_bh(&conn->sess->ttt_lock);
 972                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 973                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 974                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 975                 spin_unlock_bh(&conn->sess->ttt_lock);
 976         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 977                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 978         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 979         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 980         cmd->first_burst_len    = payload_length;
 981
 982         if (!conn->sess->sess_ops->RDMAExtensions &&
 983              cmd->data_direction == DMA_FROM_DEVICE) {
 984                 struct iscsi_datain_req *dr;
 985
 986                 dr = iscsit_allocate_datain_req();
 987                 if (!dr)
 988                         return iscsit_add_reject_from_cmd(
 989                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 990                                         1, 1, buf, cmd);
 991
 992                 iscsit_attach_datain_req(cmd, dr);
 993         }
 994
 995         /*
 996          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 997          */
 998         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 999                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1000                         cmd->data_direction, sam_task_attr,
1001                         cmd->sense_buffer + 2);
1002
1003         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1004                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1005                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1006                 conn->cid);
1007
1008         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1009
1010         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1011                                                      scsilun_to_int(&hdr->lun));
1012         if (cmd->sense_reason)
1013                 goto attach_cmd;
1014
1015         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1016         if (cmd->sense_reason) {
1017                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1018                         return iscsit_add_reject_from_cmd(
1019                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1020                                         1, 1, buf, cmd);
1021                 }
1022
1023                 goto attach_cmd;
1024         }
1025
1026         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1027                 return iscsit_add_reject_from_cmd(
1028                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1029                         1, 1, buf, cmd);
1030         }
1031
1032 attach_cmd:
1033         spin_lock_bh(&conn->cmd_lock);
1034         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1035         spin_unlock_bh(&conn->cmd_lock);
1036         /*
1037          * Check if we need to delay processing because of ALUA
1038          * Active/NonOptimized primary access state..
1039          */
1040         core_alua_check_nonop_delay(&cmd->se_cmd);
1041
1042         return 0;
1043 }
1044 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1045
1046 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1047 {
1048         iscsit_set_dataout_sequence_values(cmd);
1049
1050         spin_lock_bh(&cmd->dataout_timeout_lock);
1051         iscsit_start_dataout_timer(cmd, cmd->conn);
1052         spin_unlock_bh(&cmd->dataout_timeout_lock);
1053 }
1054 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1055
1056 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1057                             struct iscsi_scsi_req *hdr)
1058 {
1059         int cmdsn_ret = 0;
1060         /*
1061          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1062          * the Immediate Bit is not set, and no Immediate
1063          * Data is attached.
1064          *
1065          * A PDU/CmdSN carrying Immediate Data can only
1066          * be processed after the DataCRC has passed.
1067          * If the DataCRC fails, the CmdSN MUST NOT
1068          * be acknowledged. (See below)
1069          */
1070         if (!cmd->immediate_data) {
1071                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1072                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1073                         if (!cmd->sense_reason)
1074                                 return 0;
1075
1076                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1077                         return 0;
1078                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1079                         return iscsit_add_reject_from_cmd(
1080                                 ISCSI_REASON_PROTOCOL_ERROR,
1081                                 1, 0, (unsigned char *)hdr, cmd);
1082                 }
1083         }
1084
1085         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1086
1087         /*
1088          * If no Immediate Data is attached, it's OK to return now.
1089          */
1090         if (!cmd->immediate_data) {
1091                 if (!cmd->sense_reason && cmd->unsolicited_data)
1092                         iscsit_set_unsoliticed_dataout(cmd);
1093                 if (!cmd->sense_reason)
1094                         return 0;
1095
1096                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1097                 return 0;
1098         }
1099
1100         /*
1101          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1102          * execution.  These exceptions are processed in CmdSN order using
1103          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1104          */
1105         if (cmd->sense_reason) {
1106                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1107                 return 1;
1108         }
1109         /*
1110          * Call directly into transport_generic_new_cmd() to perform
1111          * the backend memory allocation.
1112          */
1113         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1114         if (cmd->sense_reason) {
1115                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1116                 return 1;
1117         }
1118
1119         return 0;
1120 }
1121 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1122
1123 static int
1124 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1125                           bool dump_payload)
1126 {
1127         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128         /*
1129          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1130          */
1131         if (dump_payload == true)
1132                 goto after_immediate_data;
1133
1134         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1135                                         cmd->first_burst_len);
1136 after_immediate_data:
1137         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1138                 /*
1139                  * A PDU/CmdSN carrying Immediate Data passed
1140                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1141                  * Immediate Bit is not set.
1142                  */
1143                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
1144
1145                 if (cmd->sense_reason) {
1146                         if (iscsit_dump_data_payload(cmd->conn,
1147                                         cmd->first_burst_len, 1) < 0)
1148                                 return -1;
1149                 } else if (cmd->unsolicited_data)
1150                         iscsit_set_unsoliticed_dataout(cmd);
1151
1152                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1153                         return iscsit_add_reject_from_cmd(
1154                                 ISCSI_REASON_PROTOCOL_ERROR,
1155                                 1, 0, (unsigned char *)hdr, cmd);
1156
1157         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1158                 /*
1159                  * Immediate Data failed DataCRC and ERL>=1,
1160                  * silently drop this PDU and let the initiator
1161                  * plug the CmdSN gap.
1162                  *
1163                  * FIXME: Send Unsolicited NOPIN with reserved
1164                  * TTT here to help the initiator figure out
1165                  * the missing CmdSN, although they should be
1166                  * intelligent enough to determine the missing
1167                  * CmdSN and issue a retry to plug the sequence.
1168                  */
1169                 cmd->i_state = ISTATE_REMOVE;
1170                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1171         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1172                 return -1;
1173
1174         return 0;
1175 }
1176
1177 static int
1178 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1179                            unsigned char *buf)
1180 {
1181         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1182         int rc, immed_data;
1183         bool dump_payload = false;
1184
1185         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1186         if (rc < 0)
1187                 return rc;
1188         /*
1189          * Allocation iovecs needed for struct socket operations for
1190          * traditional iSCSI block I/O.
1191          */
1192         if (iscsit_allocate_iovecs(cmd) < 0) {
1193                 return iscsit_add_reject_from_cmd(
1194                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1195                                 1, 0, buf, cmd);
1196         }
1197         immed_data = cmd->immediate_data;
1198
1199         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1200         if (rc < 0)
1201                 return rc;
1202         else if (rc > 0)
1203                 dump_payload = true;
1204
1205         if (!immed_data)
1206                 return 0;
1207
1208         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1209 }
1210
1211 static u32 iscsit_do_crypto_hash_sg(
1212         struct hash_desc *hash,
1213         struct iscsi_cmd *cmd,
1214         u32 data_offset,
1215         u32 data_length,
1216         u32 padding,
1217         u8 *pad_bytes)
1218 {
1219         u32 data_crc;
1220         u32 i;
1221         struct scatterlist *sg;
1222         unsigned int page_off;
1223
1224         crypto_hash_init(hash);
1225
1226         sg = cmd->first_data_sg;
1227         page_off = cmd->first_data_sg_off;
1228
1229         i = 0;
1230         while (data_length) {
1231                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1232
1233                 crypto_hash_update(hash, &sg[i], cur_len);
1234
1235                 data_length -= cur_len;
1236                 page_off = 0;
1237                 i++;
1238         }
1239
1240         if (padding) {
1241                 struct scatterlist pad_sg;
1242
1243                 sg_init_one(&pad_sg, pad_bytes, padding);
1244                 crypto_hash_update(hash, &pad_sg, padding);
1245         }
1246         crypto_hash_final(hash, (u8 *) &data_crc);
1247
1248         return data_crc;
1249 }
1250
1251 static void iscsit_do_crypto_hash_buf(
1252         struct hash_desc *hash,
1253         const void *buf,
1254         u32 payload_length,
1255         u32 padding,
1256         u8 *pad_bytes,
1257         u8 *data_crc)
1258 {
1259         struct scatterlist sg;
1260
1261         crypto_hash_init(hash);
1262
1263         sg_init_one(&sg, buf, payload_length);
1264         crypto_hash_update(hash, &sg, payload_length);
1265
1266         if (padding) {
1267                 sg_init_one(&sg, pad_bytes, padding);
1268                 crypto_hash_update(hash, &sg, padding);
1269         }
1270         crypto_hash_final(hash, data_crc);
1271 }
1272
1273 int
1274 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1275                           struct iscsi_cmd **out_cmd)
1276 {
1277         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1278         struct iscsi_cmd *cmd = NULL;
1279         struct se_cmd *se_cmd;
1280         unsigned long flags;
1281         u32 payload_length = ntoh24(hdr->dlength);
1282         int rc;
1283
1284         if (!payload_length) {
1285                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1286                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1287                                         buf, conn);
1288         }
1289
1290         /* iSCSI write */
1291         spin_lock_bh(&conn->sess->session_stats_lock);
1292         conn->sess->rx_data_octets += payload_length;
1293         if (conn->sess->se_sess->se_node_acl) {
1294                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1295                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1296                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1297         }
1298         spin_unlock_bh(&conn->sess->session_stats_lock);
1299
1300         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1301                 pr_err("DataSegmentLength: %u is greater than"
1302                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1303                         conn->conn_ops->MaxXmitDataSegmentLength);
1304                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1305                                         buf, conn);
1306         }
1307
1308         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1309                         payload_length);
1310         if (!cmd)
1311                 return 0;
1312
1313         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1314                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1315                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1316                 payload_length, conn->cid);
1317
1318         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1319                 pr_err("Command ITT: 0x%08x received DataOUT after"
1320                         " last DataOUT received, dumping payload\n",
1321                         cmd->init_task_tag);
1322                 return iscsit_dump_data_payload(conn, payload_length, 1);
1323         }
1324
1325         if (cmd->data_direction != DMA_TO_DEVICE) {
1326                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1327                         " NON-WRITE command.\n", cmd->init_task_tag);
1328                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1329                                 1, 0, buf, cmd);
1330         }
1331         se_cmd = &cmd->se_cmd;
1332         iscsit_mod_dataout_timer(cmd);
1333
1334         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1335                 pr_err("DataOut Offset: %u, Length %u greater than"
1336                         " iSCSI Command EDTL %u, protocol error.\n",
1337                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1338                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1339                                 1, 0, buf, cmd);
1340         }
1341
1342         if (cmd->unsolicited_data) {
1343                 int dump_unsolicited_data = 0;
1344
1345                 if (conn->sess->sess_ops->InitialR2T) {
1346                         pr_err("Received unexpected unsolicited data"
1347                                 " while InitialR2T=Yes, protocol error.\n");
1348                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1349                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1350                         return -1;
1351                 }
1352                 /*
1353                  * Special case for dealing with Unsolicited DataOUT
1354                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1355                  * failures;
1356                  */
1357
1358                 /* Something's amiss if we're not in WRITE_PENDING state... */
1359                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1360                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1361                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1362
1363                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1364                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1365                         dump_unsolicited_data = 1;
1366                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1367
1368                 if (dump_unsolicited_data) {
1369                         /*
1370                          * Check if a delayed TASK_ABORTED status needs to
1371                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1372                          * received with the unsolicitied data out.
1373                          */
1374                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1375                                 iscsit_stop_dataout_timer(cmd);
1376
1377                         transport_check_aborted_status(se_cmd,
1378                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1379                         return iscsit_dump_data_payload(conn, payload_length, 1);
1380                 }
1381         } else {
1382                 /*
1383                  * For the normal solicited data path:
1384                  *
1385                  * Check for a delayed TASK_ABORTED status and dump any
1386                  * incoming data out payload if one exists.  Also, when the
1387                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1388                  * data out sequence, we decrement outstanding_r2ts.  Once
1389                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1390                  * TASK_ABORTED status.
1391                  */
1392                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1393                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1394                                 if (--cmd->outstanding_r2ts < 1) {
1395                                         iscsit_stop_dataout_timer(cmd);
1396                                         transport_check_aborted_status(
1397                                                         se_cmd, 1);
1398                                 }
1399
1400                         return iscsit_dump_data_payload(conn, payload_length, 1);
1401                 }
1402         }
1403         /*
1404          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1405          * within-command recovery checks before receiving the payload.
1406          */
1407         rc = iscsit_check_pre_dataout(cmd, buf);
1408         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1409                 return 0;
1410         else if (rc == DATAOUT_CANNOT_RECOVER)
1411                 return -1;
1412
1413         *out_cmd = cmd;
1414         return 0;
1415 }
1416 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1417
1418 static int
1419 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1420                    struct iscsi_data *hdr)
1421 {
1422         struct kvec *iov;
1423         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1424         u32 payload_length = ntoh24(hdr->dlength);
1425         int iov_ret, data_crc_failed = 0;
1426
1427         rx_size += payload_length;
1428         iov = &cmd->iov_data[0];
1429
1430         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1431                                    payload_length);
1432         if (iov_ret < 0)
1433                 return -1;
1434
1435         iov_count += iov_ret;
1436
1437         padding = ((-payload_length) & 3);
1438         if (padding != 0) {
1439                 iov[iov_count].iov_base = cmd->pad_bytes;
1440                 iov[iov_count++].iov_len = padding;
1441                 rx_size += padding;
1442                 pr_debug("Receiving %u padding bytes.\n", padding);
1443         }
1444
1445         if (conn->conn_ops->DataDigest) {
1446                 iov[iov_count].iov_base = &checksum;
1447                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1448                 rx_size += ISCSI_CRC_LEN;
1449         }
1450
1451         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1452
1453         iscsit_unmap_iovec(cmd);
1454
1455         if (rx_got != rx_size)
1456                 return -1;
1457
1458         if (conn->conn_ops->DataDigest) {
1459                 u32 data_crc;
1460
1461                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1462                                                     be32_to_cpu(hdr->offset),
1463                                                     payload_length, padding,
1464                                                     cmd->pad_bytes);
1465
1466                 if (checksum != data_crc) {
1467                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1468                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1469                                 " does not match computed 0x%08x\n",
1470                                 hdr->itt, hdr->offset, payload_length,
1471                                 hdr->datasn, checksum, data_crc);
1472                         data_crc_failed = 1;
1473                 } else {
1474                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1475                                 " %u bytes of Data Out\n", checksum,
1476                                 payload_length);
1477                 }
1478         }
1479
1480         return data_crc_failed;
1481 }
1482
1483 int
1484 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1485                              bool data_crc_failed)
1486 {
1487         struct iscsi_conn *conn = cmd->conn;
1488         int rc, ooo_cmdsn;
1489         /*
1490          * Increment post receive data and CRC values or perform
1491          * within-command recovery.
1492          */
1493         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1494         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1495                 return 0;
1496         else if (rc == DATAOUT_SEND_R2T) {
1497                 iscsit_set_dataout_sequence_values(cmd);
1498                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1499         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1500                 /*
1501                  * Handle extra special case for out of order
1502                  * Unsolicited Data Out.
1503                  */
1504                 spin_lock_bh(&cmd->istate_lock);
1505                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1506                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1507                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1508                 spin_unlock_bh(&cmd->istate_lock);
1509
1510                 iscsit_stop_dataout_timer(cmd);
1511                 if (ooo_cmdsn)
1512                         return 0;
1513                 target_execute_cmd(&cmd->se_cmd);
1514                 return 0;
1515         } else /* DATAOUT_CANNOT_RECOVER */
1516                 return -1;
1517
1518         return 0;
1519 }
1520 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1521
1522 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1523 {
1524         struct iscsi_cmd *cmd;
1525         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1526         int rc;
1527         bool data_crc_failed = false;
1528
1529         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1530         if (rc < 0)
1531                 return rc;
1532         else if (!cmd)
1533                 return 0;
1534
1535         rc = iscsit_get_dataout(conn, cmd, hdr);
1536         if (rc < 0)
1537                 return rc;
1538         else if (rc > 0)
1539                 data_crc_failed = true;
1540
1541         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1542 }
1543
1544 int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1545                         unsigned char *buf)
1546 {
1547         unsigned char *ping_data = NULL;
1548         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1549         u32 checksum, data_crc, padding = 0, payload_length;
1550         struct iscsi_cmd *cmd_p = NULL;
1551         struct kvec *iov = NULL;
1552         struct iscsi_nopout *hdr;
1553
1554         hdr                     = (struct iscsi_nopout *) buf;
1555         payload_length          = ntoh24(hdr->dlength);
1556
1557         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1558                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1559                         " not set, protocol error.\n");
1560                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1561                                         buf, conn);
1562         }
1563
1564         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1565                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1566                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1567                         " error.\n", payload_length,
1568                         conn->conn_ops->MaxXmitDataSegmentLength);
1569                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1570                                         buf, conn);
1571         }
1572
1573         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1574                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1575                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1576                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1577                 payload_length);
1578         /*
1579          * This is not a response to a Unsolicited NopIN, which means
1580          * it can either be a NOPOUT ping request (with a valid ITT),
1581          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1582          * Either way, make sure we allocate an struct iscsi_cmd, as both
1583          * can contain ping data.
1584          */
1585         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1586                 if (!cmd)
1587                         return iscsit_add_reject(
1588                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1589                                         1, buf, conn);
1590
1591                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1592                 cmd->i_state            = ISTATE_SEND_NOPIN;
1593                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1594                                                 1 : 0);
1595                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1596                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1597                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1598                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1599                 cmd->data_direction     = DMA_NONE;
1600         }
1601
1602         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1603                 rx_size = payload_length;
1604                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1605                 if (!ping_data) {
1606                         pr_err("Unable to allocate memory for"
1607                                 " NOPOUT ping data.\n");
1608                         ret = -1;
1609                         goto out;
1610                 }
1611
1612                 iov = &cmd->iov_misc[0];
1613                 iov[niov].iov_base      = ping_data;
1614                 iov[niov++].iov_len     = payload_length;
1615
1616                 padding = ((-payload_length) & 3);
1617                 if (padding != 0) {
1618                         pr_debug("Receiving %u additional bytes"
1619                                 " for padding.\n", padding);
1620                         iov[niov].iov_base      = &cmd->pad_bytes;
1621                         iov[niov++].iov_len     = padding;
1622                         rx_size += padding;
1623                 }
1624                 if (conn->conn_ops->DataDigest) {
1625                         iov[niov].iov_base      = &checksum;
1626                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1627                         rx_size += ISCSI_CRC_LEN;
1628                 }
1629
1630                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1631                 if (rx_got != rx_size) {
1632                         ret = -1;
1633                         goto out;
1634                 }
1635
1636                 if (conn->conn_ops->DataDigest) {
1637                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1638                                         ping_data, payload_length,
1639                                         padding, cmd->pad_bytes,
1640                                         (u8 *)&data_crc);
1641
1642                         if (checksum != data_crc) {
1643                                 pr_err("Ping data CRC32C DataDigest"
1644                                 " 0x%08x does not match computed 0x%08x\n",
1645                                         checksum, data_crc);
1646                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1647                                         pr_err("Unable to recover from"
1648                                         " NOPOUT Ping DataCRC failure while in"
1649                                                 " ERL=0.\n");
1650                                         ret = -1;
1651                                         goto out;
1652                                 } else {
1653                                         /*
1654                                          * Silently drop this PDU and let the
1655                                          * initiator plug the CmdSN gap.
1656                                          */
1657                                         pr_debug("Dropping NOPOUT"
1658                                         " Command CmdSN: 0x%08x due to"
1659                                         " DataCRC error.\n", hdr->cmdsn);
1660                                         ret = 0;
1661                                         goto out;
1662                                 }
1663                         } else {
1664                                 pr_debug("Got CRC32C DataDigest"
1665                                 " 0x%08x for %u bytes of ping data.\n",
1666                                         checksum, payload_length);
1667                         }
1668                 }
1669
1670                 ping_data[payload_length] = '\0';
1671                 /*
1672                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1673                  */
1674                 cmd->buf_ptr = ping_data;
1675                 cmd->buf_ptr_size = payload_length;
1676
1677                 pr_debug("Got %u bytes of NOPOUT ping"
1678                         " data.\n", payload_length);
1679                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1680         }
1681
1682         if (hdr->itt != RESERVED_ITT) {
1683                 if (!cmd) {
1684                         pr_err("Checking CmdSN for NOPOUT,"
1685                                 " but cmd is NULL!\n");
1686                         return -1;
1687                 }
1688                 /*
1689                  * Initiator is expecting a NopIN ping reply,
1690                  */
1691                 spin_lock_bh(&conn->cmd_lock);
1692                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1693                 spin_unlock_bh(&conn->cmd_lock);
1694
1695                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1696
1697                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1698                         iscsit_add_cmd_to_response_queue(cmd, conn,
1699                                         cmd->i_state);
1700                         return 0;
1701                 }
1702
1703                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1704                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1705                         ret = 0;
1706                         goto ping_out;
1707                 }
1708                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1709                         return iscsit_add_reject_from_cmd(
1710                                         ISCSI_REASON_PROTOCOL_ERROR,
1711                                         1, 0, buf, cmd);
1712
1713                 return 0;
1714         }
1715
1716         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1717                 /*
1718                  * This was a response to a unsolicited NOPIN ping.
1719                  */
1720                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1721                 if (!cmd_p)
1722                         return -1;
1723
1724                 iscsit_stop_nopin_response_timer(conn);
1725
1726                 cmd_p->i_state = ISTATE_REMOVE;
1727                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1728                 iscsit_start_nopin_timer(conn);
1729         } else {
1730                 /*
1731                  * Initiator is not expecting a NOPIN is response.
1732                  * Just ignore for now.
1733                  *
1734                  * iSCSI v19-91 10.18
1735                  * "A NOP-OUT may also be used to confirm a changed
1736                  *  ExpStatSN if another PDU will not be available
1737                  *  for a long time."
1738                  */
1739                 ret = 0;
1740                 goto out;
1741         }
1742
1743         return 0;
1744 out:
1745         if (cmd)
1746                 iscsit_free_cmd(cmd, false);
1747 ping_out:
1748         kfree(ping_data);
1749         return ret;
1750 }
1751 EXPORT_SYMBOL(iscsit_handle_nop_out);
1752
1753 int
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755                            unsigned char *buf)
1756 {
1757         struct se_tmr_req *se_tmr;
1758         struct iscsi_tmr_req *tmr_req;
1759         struct iscsi_tm *hdr;
1760         int out_of_order_cmdsn = 0;
1761         int ret;
1762         u8 function;
1763
1764         hdr                     = (struct iscsi_tm *) buf;
1765         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1766         function = hdr->flags;
1767
1768         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1769                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1770                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1771                 hdr->rtt, hdr->refcmdsn, conn->cid);
1772
1773         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1774             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1775              hdr->rtt != RESERVED_ITT)) {
1776                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1777                 hdr->rtt = RESERVED_ITT;
1778         }
1779
1780         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1781                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1782                 pr_err("Task Management Request TASK_REASSIGN not"
1783                         " issued as immediate command, bad iSCSI Initiator"
1784                                 "implementation\n");
1785                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1786                                         1, 1, buf, cmd);
1787         }
1788         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1789             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1790                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1791
1792         cmd->data_direction = DMA_NONE;
1793
1794         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1795         if (!cmd->tmr_req) {
1796                 pr_err("Unable to allocate memory for"
1797                         " Task Management command!\n");
1798                 return iscsit_add_reject_from_cmd(
1799                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1800                         1, 1, buf, cmd);
1801         }
1802
1803         /*
1804          * TASK_REASSIGN for ERL=2 / connection stays inside of
1805          * LIO-Target $FABRIC_MOD
1806          */
1807         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1808
1809                 u8 tcm_function;
1810                 int ret;
1811
1812                 transport_init_se_cmd(&cmd->se_cmd,
1813                                       &lio_target_fabric_configfs->tf_ops,
1814                                       conn->sess->se_sess, 0, DMA_NONE,
1815                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1816
1817                 switch (function) {
1818                 case ISCSI_TM_FUNC_ABORT_TASK:
1819                         tcm_function = TMR_ABORT_TASK;
1820                         break;
1821                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1822                         tcm_function = TMR_ABORT_TASK_SET;
1823                         break;
1824                 case ISCSI_TM_FUNC_CLEAR_ACA:
1825                         tcm_function = TMR_CLEAR_ACA;
1826                         break;
1827                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1828                         tcm_function = TMR_CLEAR_TASK_SET;
1829                         break;
1830                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1831                         tcm_function = TMR_LUN_RESET;
1832                         break;
1833                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1834                         tcm_function = TMR_TARGET_WARM_RESET;
1835                         break;
1836                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1837                         tcm_function = TMR_TARGET_COLD_RESET;
1838                         break;
1839                 default:
1840                         pr_err("Unknown iSCSI TMR Function:"
1841                                " 0x%02x\n", function);
1842                         return iscsit_add_reject_from_cmd(
1843                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1844                                 1, 1, buf, cmd);
1845                 }
1846
1847                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1848                                          tcm_function, GFP_KERNEL);
1849                 if (ret < 0)
1850                         return iscsit_add_reject_from_cmd(
1851                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1852                                 1, 1, buf, cmd);
1853
1854                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855         }
1856
1857         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1858         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1859         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860         cmd->init_task_tag      = hdr->itt;
1861         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1862         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1863         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1864         se_tmr                  = cmd->se_cmd.se_tmr_req;
1865         tmr_req                 = cmd->tmr_req;
1866         /*
1867          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1868          */
1869         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1870                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871                                                scsilun_to_int(&hdr->lun));
1872                 if (ret < 0) {
1873                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1874                         goto attach;
1875                 }
1876         }
1877
1878         switch (function) {
1879         case ISCSI_TM_FUNC_ABORT_TASK:
1880                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1881                 if (se_tmr->response)
1882                         goto attach;
1883                 break;
1884         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885         case ISCSI_TM_FUNC_CLEAR_ACA:
1886         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1888                 break;
1889         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1891                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892                         goto attach;
1893                 }
1894                 break;
1895         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1897                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898                         goto attach;
1899                 }
1900                 break;
1901         case ISCSI_TM_FUNC_TASK_REASSIGN:
1902                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1903                 /*
1904                  * Perform sanity checks on the ExpDataSN only if the
1905                  * TASK_REASSIGN was successful.
1906                  */
1907                 if (se_tmr->response)
1908                         break;
1909
1910                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1911                         return iscsit_add_reject_from_cmd(
1912                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1913                                         buf, cmd);
1914                 break;
1915         default:
1916                 pr_err("Unknown TMR function: 0x%02x, protocol"
1917                         " error.\n", function);
1918                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1919                 goto attach;
1920         }
1921
1922         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1923             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1924                 se_tmr->call_transport = 1;
1925 attach:
1926         spin_lock_bh(&conn->cmd_lock);
1927         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1928         spin_unlock_bh(&conn->cmd_lock);
1929
1930         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1931                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1932                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1933                         out_of_order_cmdsn = 1;
1934                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1935                         return 0;
1936                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1937                         return iscsit_add_reject_from_cmd(
1938                                         ISCSI_REASON_PROTOCOL_ERROR,
1939                                         1, 0, buf, cmd);
1940         }
1941         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1942
1943         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1944                 return 0;
1945         /*
1946          * Found the referenced task, send to transport for processing.
1947          */
1948         if (se_tmr->call_transport)
1949                 return transport_generic_handle_tmr(&cmd->se_cmd);
1950
1951         /*
1952          * Could not find the referenced LUN, task, or Task Management
1953          * command not authorized or supported.  Change state and
1954          * let the tx_thread send the response.
1955          *
1956          * For connection recovery, this is also the default action for
1957          * TMR TASK_REASSIGN.
1958          */
1959         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1960         return 0;
1961 }
1962 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1963
1964 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1965 static int iscsit_handle_text_cmd(
1966         struct iscsi_conn *conn,
1967         unsigned char *buf)
1968 {
1969         char *text_ptr, *text_in;
1970         int cmdsn_ret, niov = 0, rx_got, rx_size;
1971         u32 checksum = 0, data_crc = 0, payload_length;
1972         u32 padding = 0, pad_bytes = 0, text_length = 0;
1973         struct iscsi_cmd *cmd;
1974         struct kvec iov[3];
1975         struct iscsi_text *hdr;
1976
1977         hdr                     = (struct iscsi_text *) buf;
1978         payload_length          = ntoh24(hdr->dlength);
1979
1980         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1981                 pr_err("Unable to accept text parameter length: %u"
1982                         "greater than MaxXmitDataSegmentLength %u.\n",
1983                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1984                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1985                                         buf, conn);
1986         }
1987
1988         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990                 hdr->exp_statsn, payload_length);
1991
1992         rx_size = text_length = payload_length;
1993         if (text_length) {
1994                 text_in = kzalloc(text_length, GFP_KERNEL);
1995                 if (!text_in) {
1996                         pr_err("Unable to allocate memory for"
1997                                 " incoming text parameters\n");
1998                         return -1;
1999                 }
2000
2001                 memset(iov, 0, 3 * sizeof(struct kvec));
2002                 iov[niov].iov_base      = text_in;
2003                 iov[niov++].iov_len     = text_length;
2004
2005                 padding = ((-payload_length) & 3);
2006                 if (padding != 0) {
2007                         iov[niov].iov_base = &pad_bytes;
2008                         iov[niov++].iov_len  = padding;
2009                         rx_size += padding;
2010                         pr_debug("Receiving %u additional bytes"
2011                                         " for padding.\n", padding);
2012                 }
2013                 if (conn->conn_ops->DataDigest) {
2014                         iov[niov].iov_base      = &checksum;
2015                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2016                         rx_size += ISCSI_CRC_LEN;
2017                 }
2018
2019                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2020                 if (rx_got != rx_size) {
2021                         kfree(text_in);
2022                         return -1;
2023                 }
2024
2025                 if (conn->conn_ops->DataDigest) {
2026                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2027                                         text_in, text_length,
2028                                         padding, (u8 *)&pad_bytes,
2029                                         (u8 *)&data_crc);
2030
2031                         if (checksum != data_crc) {
2032                                 pr_err("Text data CRC32C DataDigest"
2033                                         " 0x%08x does not match computed"
2034                                         " 0x%08x\n", checksum, data_crc);
2035                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2036                                         pr_err("Unable to recover from"
2037                                         " Text Data digest failure while in"
2038                                                 " ERL=0.\n");
2039                                         kfree(text_in);
2040                                         return -1;
2041                                 } else {
2042                                         /*
2043                                          * Silently drop this PDU and let the
2044                                          * initiator plug the CmdSN gap.
2045                                          */
2046                                         pr_debug("Dropping Text"
2047                                         " Command CmdSN: 0x%08x due to"
2048                                         " DataCRC error.\n", hdr->cmdsn);
2049                                         kfree(text_in);
2050                                         return 0;
2051                                 }
2052                         } else {
2053                                 pr_debug("Got CRC32C DataDigest"
2054                                         " 0x%08x for %u bytes of text data.\n",
2055                                                 checksum, text_length);
2056                         }
2057                 }
2058                 text_in[text_length - 1] = '\0';
2059                 pr_debug("Successfully read %d bytes of text"
2060                                 " data.\n", text_length);
2061
2062                 if (strncmp("SendTargets", text_in, 11) != 0) {
2063                         pr_err("Received Text Data that is not"
2064                                 " SendTargets, cannot continue.\n");
2065                         kfree(text_in);
2066                         return -1;
2067                 }
2068                 text_ptr = strchr(text_in, '=');
2069                 if (!text_ptr) {
2070                         pr_err("No \"=\" separator found in Text Data,"
2071                                 "  cannot continue.\n");
2072                         kfree(text_in);
2073                         return -1;
2074                 }
2075                 if (strncmp("=All", text_ptr, 4) != 0) {
2076                         pr_err("Unable to locate All value for"
2077                                 " SendTargets key,  cannot continue.\n");
2078                         kfree(text_in);
2079                         return -1;
2080                 }
2081 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2082                 kfree(text_in);
2083         }
2084
2085         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2086         if (!cmd)
2087                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2088                                         1, buf, conn);
2089
2090         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2091         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2092         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2093         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2094         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2095         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2096         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2097         cmd->data_direction     = DMA_NONE;
2098
2099         spin_lock_bh(&conn->cmd_lock);
2100         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2101         spin_unlock_bh(&conn->cmd_lock);
2102
2103         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2104
2105         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2106                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2107                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2108                         return iscsit_add_reject_from_cmd(
2109                                         ISCSI_REASON_PROTOCOL_ERROR,
2110                                         1, 0, buf, cmd);
2111
2112                 return 0;
2113         }
2114
2115         return iscsit_execute_cmd(cmd, 0);
2116 }
2117
2118 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2119 {
2120         struct iscsi_conn *conn_p;
2121         struct iscsi_session *sess = conn->sess;
2122
2123         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2124                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2125
2126         atomic_set(&sess->session_logout, 1);
2127         atomic_set(&conn->conn_logout_remove, 1);
2128         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2129
2130         iscsit_inc_conn_usage_count(conn);
2131         iscsit_inc_session_usage_count(sess);
2132
2133         spin_lock_bh(&sess->conn_lock);
2134         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2135                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2136                         continue;
2137
2138                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2139                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2140         }
2141         spin_unlock_bh(&sess->conn_lock);
2142
2143         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2144
2145         return 0;
2146 }
2147
2148 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2149 {
2150         struct iscsi_conn *l_conn;
2151         struct iscsi_session *sess = conn->sess;
2152
2153         pr_debug("Received logout request CLOSECONNECTION for CID:"
2154                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2155
2156         /*
2157          * A Logout Request with a CLOSECONNECTION reason code for a CID
2158          * can arrive on a connection with a differing CID.
2159          */
2160         if (conn->cid == cmd->logout_cid) {
2161                 spin_lock_bh(&conn->state_lock);
2162                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2163                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2164
2165                 atomic_set(&conn->conn_logout_remove, 1);
2166                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2167                 iscsit_inc_conn_usage_count(conn);
2168
2169                 spin_unlock_bh(&conn->state_lock);
2170         } else {
2171                 /*
2172                  * Handle all different cid CLOSECONNECTION requests in
2173                  * iscsit_logout_post_handler_diffcid() as to give enough
2174                  * time for any non immediate command's CmdSN to be
2175                  * acknowledged on the connection in question.
2176                  *
2177                  * Here we simply make sure the CID is still around.
2178                  */
2179                 l_conn = iscsit_get_conn_from_cid(sess,
2180                                 cmd->logout_cid);
2181                 if (!l_conn) {
2182                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2183                         iscsit_add_cmd_to_response_queue(cmd, conn,
2184                                         cmd->i_state);
2185                         return 0;
2186                 }
2187
2188                 iscsit_dec_conn_usage_count(l_conn);
2189         }
2190
2191         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2192
2193         return 0;
2194 }
2195
2196 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2197 {
2198         struct iscsi_session *sess = conn->sess;
2199
2200         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2201                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2202
2203         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2204                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2205                         " while ERL!=2.\n");
2206                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2207                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2208                 return 0;
2209         }
2210
2211         if (conn->cid == cmd->logout_cid) {
2212                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213                         " with CID: %hu on CID: %hu, implementation error.\n",
2214                                 cmd->logout_cid, conn->cid);
2215                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2216                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2217                 return 0;
2218         }
2219
2220         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2221
2222         return 0;
2223 }
2224
2225 int
2226 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2227                         unsigned char *buf)
2228 {
2229         int cmdsn_ret, logout_remove = 0;
2230         u8 reason_code = 0;
2231         struct iscsi_logout *hdr;
2232         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2233
2234         hdr                     = (struct iscsi_logout *) buf;
2235         reason_code             = (hdr->flags & 0x7f);
2236
2237         if (tiqn) {
2238                 spin_lock(&tiqn->logout_stats.lock);
2239                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2240                         tiqn->logout_stats.normal_logouts++;
2241                 else
2242                         tiqn->logout_stats.abnormal_logouts++;
2243                 spin_unlock(&tiqn->logout_stats.lock);
2244         }
2245
2246         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2247                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2248                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2249                 hdr->cid, conn->cid);
2250
2251         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2252                 pr_err("Received logout request on connection that"
2253                         " is not in logged in state, ignoring request.\n");
2254                 iscsit_free_cmd(cmd, false);
2255                 return 0;
2256         }
2257
2258         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2259         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2260         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2261         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2262         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2263         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2264         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2265         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2266         cmd->logout_reason      = reason_code;
2267         cmd->data_direction     = DMA_NONE;
2268
2269         /*
2270          * We need to sleep in these cases (by returning 1) until the Logout
2271          * Response gets sent in the tx thread.
2272          */
2273         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2274            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2275             be16_to_cpu(hdr->cid) == conn->cid))
2276                 logout_remove = 1;
2277
2278         spin_lock_bh(&conn->cmd_lock);
2279         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2280         spin_unlock_bh(&conn->cmd_lock);
2281
2282         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2283                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2284
2285         /*
2286          * Immediate commands are executed, well, immediately.
2287          * Non-Immediate Logout Commands are executed in CmdSN order.
2288          */
2289         if (cmd->immediate_cmd) {
2290                 int ret = iscsit_execute_cmd(cmd, 0);
2291
2292                 if (ret < 0)
2293                         return ret;
2294         } else {
2295                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2296                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2297                         logout_remove = 0;
2298                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2299                         return iscsit_add_reject_from_cmd(
2300                                 ISCSI_REASON_PROTOCOL_ERROR,
2301                                 1, 0, buf, cmd);
2302                 }
2303         }
2304
2305         return logout_remove;
2306 }
2307 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2308
2309 static int iscsit_handle_snack(
2310         struct iscsi_conn *conn,
2311         unsigned char *buf)
2312 {
2313         struct iscsi_snack *hdr;
2314
2315         hdr                     = (struct iscsi_snack *) buf;
2316         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2317
2318         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2319                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2320                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2321                         hdr->begrun, hdr->runlength, conn->cid);
2322
2323         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2324                 pr_err("Initiator sent SNACK request while in"
2325                         " ErrorRecoveryLevel=0.\n");
2326                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2327                                         buf, conn);
2328         }
2329         /*
2330          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2331          * call from inside iscsi_send_recovery_datain_or_r2t().
2332          */
2333         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2334         case 0:
2335                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2336                         hdr->itt,
2337                         be32_to_cpu(hdr->ttt),
2338                         be32_to_cpu(hdr->begrun),
2339                         be32_to_cpu(hdr->runlength));
2340         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2341                 return iscsit_handle_status_snack(conn, hdr->itt,
2342                         be32_to_cpu(hdr->ttt),
2343                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2344         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2345                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2346                         be32_to_cpu(hdr->begrun),
2347                         be32_to_cpu(hdr->runlength));
2348         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2349                 /* FIXME: Support R-Data SNACK */
2350                 pr_err("R-Data SNACK Not Supported.\n");
2351                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2352                                         buf, conn);
2353         default:
2354                 pr_err("Unknown SNACK type 0x%02x, protocol"
2355                         " error.\n", hdr->flags & 0x0f);
2356                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2357                                         buf, conn);
2358         }
2359
2360         return 0;
2361 }
2362
2363 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2364 {
2365         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2366             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2367                 wait_for_completion_interruptible_timeout(
2368                                         &conn->rx_half_close_comp,
2369                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2370         }
2371 }
2372
2373 static int iscsit_handle_immediate_data(
2374         struct iscsi_cmd *cmd,
2375         struct iscsi_scsi_req *hdr,
2376         u32 length)
2377 {
2378         int iov_ret, rx_got = 0, rx_size = 0;
2379         u32 checksum, iov_count = 0, padding = 0;
2380         struct iscsi_conn *conn = cmd->conn;
2381         struct kvec *iov;
2382
2383         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2384         if (iov_ret < 0)
2385                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2386
2387         rx_size = length;
2388         iov_count = iov_ret;
2389         iov = &cmd->iov_data[0];
2390
2391         padding = ((-length) & 3);
2392         if (padding != 0) {
2393                 iov[iov_count].iov_base = cmd->pad_bytes;
2394                 iov[iov_count++].iov_len = padding;
2395                 rx_size += padding;
2396         }
2397
2398         if (conn->conn_ops->DataDigest) {
2399                 iov[iov_count].iov_base         = &checksum;
2400                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2401                 rx_size += ISCSI_CRC_LEN;
2402         }
2403
2404         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2405
2406         iscsit_unmap_iovec(cmd);
2407
2408         if (rx_got != rx_size) {
2409                 iscsit_rx_thread_wait_for_tcp(conn);
2410                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2411         }
2412
2413         if (conn->conn_ops->DataDigest) {
2414                 u32 data_crc;
2415
2416                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2417                                                     cmd->write_data_done, length, padding,
2418                                                     cmd->pad_bytes);
2419
2420                 if (checksum != data_crc) {
2421                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2422                                 " does not match computed 0x%08x\n", checksum,
2423                                 data_crc);
2424
2425                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2426                                 pr_err("Unable to recover from"
2427                                         " Immediate Data digest failure while"
2428                                         " in ERL=0.\n");
2429                                 iscsit_add_reject_from_cmd(
2430                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2431                                                 1, 0, (unsigned char *)hdr, cmd);
2432                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2433                         } else {
2434                                 iscsit_add_reject_from_cmd(
2435                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2436                                                 0, 0, (unsigned char *)hdr, cmd);
2437                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2438                         }
2439                 } else {
2440                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2441                                 " %u bytes of Immediate Data\n", checksum,
2442                                 length);
2443                 }
2444         }
2445
2446         cmd->write_data_done += length;
2447
2448         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2449                 spin_lock_bh(&cmd->istate_lock);
2450                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2451                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2452                 spin_unlock_bh(&cmd->istate_lock);
2453         }
2454
2455         return IMMEDIATE_DATA_NORMAL_OPERATION;
2456 }
2457
2458 /*
2459  *      Called with sess->conn_lock held.
2460  */
2461 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2462         with active network interface */
2463 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2464 {
2465         struct iscsi_cmd *cmd;
2466         struct iscsi_conn *conn_p;
2467
2468         /*
2469          * Only send a Asynchronous Message on connections whos network
2470          * interface is still functional.
2471          */
2472         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2473                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2474                         iscsit_inc_conn_usage_count(conn_p);
2475                         break;
2476                 }
2477         }
2478
2479         if (!conn_p)
2480                 return;
2481
2482         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2483         if (!cmd) {
2484                 iscsit_dec_conn_usage_count(conn_p);
2485                 return;
2486         }
2487
2488         cmd->logout_cid = conn->cid;
2489         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2490         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2491
2492         spin_lock_bh(&conn_p->cmd_lock);
2493         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2494         spin_unlock_bh(&conn_p->cmd_lock);
2495
2496         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2497         iscsit_dec_conn_usage_count(conn_p);
2498 }
2499
2500 static int iscsit_send_conn_drop_async_message(
2501         struct iscsi_cmd *cmd,
2502         struct iscsi_conn *conn)
2503 {
2504         struct iscsi_async *hdr;
2505
2506         cmd->tx_size = ISCSI_HDR_LEN;
2507         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2508
2509         hdr                     = (struct iscsi_async *) cmd->pdu;
2510         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2511         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2512         cmd->init_task_tag      = RESERVED_ITT;
2513         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2514         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2515         cmd->stat_sn            = conn->stat_sn++;
2516         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2517         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2518         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2519         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2520         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2521         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2522         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2523
2524         if (conn->conn_ops->HeaderDigest) {
2525                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2526
2527                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2528                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2529
2530                 cmd->tx_size += ISCSI_CRC_LEN;
2531                 pr_debug("Attaching CRC32C HeaderDigest to"
2532                         " Async Message 0x%08x\n", *header_digest);
2533         }
2534
2535         cmd->iov_misc[0].iov_base       = cmd->pdu;
2536         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2537         cmd->iov_misc_count             = 1;
2538
2539         pr_debug("Sending Connection Dropped Async Message StatSN:"
2540                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2541                         cmd->logout_cid, conn->cid);
2542         return 0;
2543 }
2544
2545 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2546 {
2547         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2548             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2549                 wait_for_completion_interruptible_timeout(
2550                                         &conn->tx_half_close_comp,
2551                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2552         }
2553 }
2554
2555 static void
2556 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2557                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2558                         bool set_statsn)
2559 {
2560         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2561         hdr->flags              = datain->flags;
2562         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2563                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2564                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2565                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2566                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2567                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2568                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2569                 }
2570         }
2571         hton24(hdr->dlength, datain->length);
2572         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2573                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2574                                 (struct scsi_lun *)&hdr->lun);
2575         else
2576                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2577
2578         hdr->itt                = cmd->init_task_tag;
2579
2580         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2581                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2582         else
2583                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2584         if (set_statsn)
2585                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2586         else
2587                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2588
2589         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2590         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2591         hdr->datasn             = cpu_to_be32(datain->data_sn);
2592         hdr->offset             = cpu_to_be32(datain->offset);
2593
2594         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2595                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2596                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2597                 ntohl(hdr->offset), datain->length, conn->cid);
2598 }
2599
2600 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2601 {
2602         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2603         struct iscsi_datain datain;
2604         struct iscsi_datain_req *dr;
2605         struct kvec *iov;
2606         u32 iov_count = 0, tx_size = 0;
2607         int eodr = 0, ret, iov_ret;
2608         bool set_statsn = false;
2609
2610         memset(&datain, 0, sizeof(struct iscsi_datain));
2611         dr = iscsit_get_datain_values(cmd, &datain);
2612         if (!dr) {
2613                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2614                                 cmd->init_task_tag);
2615                 return -1;
2616         }
2617         /*
2618          * Be paranoid and double check the logic for now.
2619          */
2620         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2621                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2622                         " datain.length: %u exceeds cmd->data_length: %u\n",
2623                         cmd->init_task_tag, datain.offset, datain.length,
2624                         cmd->se_cmd.data_length);
2625                 return -1;
2626         }
2627
2628         spin_lock_bh(&conn->sess->session_stats_lock);
2629         conn->sess->tx_data_octets += datain.length;
2630         if (conn->sess->se_sess->se_node_acl) {
2631                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2632                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2633                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2634         }
2635         spin_unlock_bh(&conn->sess->session_stats_lock);
2636         /*
2637          * Special case for successfully execution w/ both DATAIN
2638          * and Sense Data.
2639          */
2640         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2641             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2642                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2643         else {
2644                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2645                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2646                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2647                         cmd->stat_sn = conn->stat_sn++;
2648                         set_statsn = true;
2649                 } else if (dr->dr_complete ==
2650                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2651                         set_statsn = true;
2652         }
2653
2654         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2655
2656         iov = &cmd->iov_data[0];
2657         iov[iov_count].iov_base = cmd->pdu;
2658         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2659         tx_size += ISCSI_HDR_LEN;
2660
2661         if (conn->conn_ops->HeaderDigest) {
2662                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2663
2664                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2665                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2666
2667                 iov[0].iov_len += ISCSI_CRC_LEN;
2668                 tx_size += ISCSI_CRC_LEN;
2669
2670                 pr_debug("Attaching CRC32 HeaderDigest"
2671                         " for DataIN PDU 0x%08x\n", *header_digest);
2672         }
2673
2674         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2675                                 datain.offset, datain.length);
2676         if (iov_ret < 0)
2677                 return -1;
2678
2679         iov_count += iov_ret;
2680         tx_size += datain.length;
2681
2682         cmd->padding = ((-datain.length) & 3);
2683         if (cmd->padding) {
2684                 iov[iov_count].iov_base         = cmd->pad_bytes;
2685                 iov[iov_count++].iov_len        = cmd->padding;
2686                 tx_size += cmd->padding;
2687
2688                 pr_debug("Attaching %u padding bytes\n",
2689                                 cmd->padding);
2690         }
2691         if (conn->conn_ops->DataDigest) {
2692                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2693                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2694
2695                 iov[iov_count].iov_base = &cmd->data_crc;
2696                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2697                 tx_size += ISCSI_CRC_LEN;
2698
2699                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2700                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2701         }
2702
2703         cmd->iov_data_count = iov_count;
2704         cmd->tx_size = tx_size;
2705
2706         /* sendpage is preferred but can't insert markers */
2707         if (!conn->conn_ops->IFMarker)
2708                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2709         else
2710                 ret = iscsit_send_tx_data(cmd, conn, 0);
2711
2712         iscsit_unmap_iovec(cmd);
2713
2714         if (ret < 0) {
2715                 iscsit_tx_thread_wait_for_tcp(conn);
2716                 return ret;
2717         }
2718
2719         if (dr->dr_complete) {
2720                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2721                                 2 : 1;
2722                 iscsit_free_datain_req(cmd, dr);
2723         }
2724
2725         return eodr;
2726 }
2727
2728 int
2729 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2730                         struct iscsi_logout_rsp *hdr)
2731 {
2732         struct iscsi_conn *logout_conn = NULL;
2733         struct iscsi_conn_recovery *cr = NULL;
2734         struct iscsi_session *sess = conn->sess;
2735         /*
2736          * The actual shutting down of Sessions and/or Connections
2737          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2738          * is done in scsi_logout_post_handler().
2739          */
2740         switch (cmd->logout_reason) {
2741         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2742                 pr_debug("iSCSI session logout successful, setting"
2743                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2744                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2745                 break;
2746         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2747                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2748                         break;
2749                 /*
2750                  * For CLOSECONNECTION logout requests carrying
2751                  * a matching logout CID -> local CID, the reference
2752                  * for the local CID will have been incremented in
2753                  * iscsi_logout_closeconnection().
2754                  *
2755                  * For CLOSECONNECTION logout requests carrying
2756                  * a different CID than the connection it arrived
2757                  * on, the connection responding to cmd->logout_cid
2758                  * is stopped in iscsit_logout_post_handler_diffcid().
2759                  */
2760
2761                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2762                         " successful.\n", cmd->logout_cid, conn->cid);
2763                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2764                 break;
2765         case ISCSI_LOGOUT_REASON_RECOVERY:
2766                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2767                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2768                         break;
2769                 /*
2770                  * If the connection is still active from our point of view
2771                  * force connection recovery to occur.
2772                  */
2773                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2774                                 cmd->logout_cid);
2775                 if (logout_conn) {
2776                         iscsit_connection_reinstatement_rcfr(logout_conn);
2777                         iscsit_dec_conn_usage_count(logout_conn);
2778                 }
2779
2780                 cr = iscsit_get_inactive_connection_recovery_entry(
2781                                 conn->sess, cmd->logout_cid);
2782                 if (!cr) {
2783                         pr_err("Unable to locate CID: %hu for"
2784                         " REMOVECONNFORRECOVERY Logout Request.\n",
2785                                 cmd->logout_cid);
2786                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2787                         break;
2788                 }
2789
2790                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2791
2792                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2793                         " for recovery for CID: %hu on CID: %hu successful.\n",
2794                                 cmd->logout_cid, conn->cid);
2795                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2796                 break;
2797         default:
2798                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2799                                 cmd->logout_reason);
2800                 return -1;
2801         }
2802
2803         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2804         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2805         hdr->response           = cmd->logout_response;
2806         hdr->itt                = cmd->init_task_tag;
2807         cmd->stat_sn            = conn->stat_sn++;
2808         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2809
2810         iscsit_increment_maxcmdsn(cmd, conn->sess);
2811         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2812         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2813
2814         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2815                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2816                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2817                 cmd->logout_cid, conn->cid);
2818
2819         return 0;
2820 }
2821 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2822
2823 static int
2824 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2825 {
2826         struct kvec *iov;
2827         int niov = 0, tx_size, rc;
2828
2829         rc = iscsit_build_logout_rsp(cmd, conn,
2830                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2831         if (rc < 0)
2832                 return rc;
2833
2834         tx_size = ISCSI_HDR_LEN;
2835         iov = &cmd->iov_misc[0];
2836         iov[niov].iov_base      = cmd->pdu;
2837         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2838
2839         if (conn->conn_ops->HeaderDigest) {
2840                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2841
2842                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2843                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2844
2845                 iov[0].iov_len += ISCSI_CRC_LEN;
2846                 tx_size += ISCSI_CRC_LEN;
2847                 pr_debug("Attaching CRC32C HeaderDigest to"
2848                         " Logout Response 0x%08x\n", *header_digest);
2849         }
2850         cmd->iov_misc_count = niov;
2851         cmd->tx_size = tx_size;
2852
2853         return 0;
2854 }
2855
2856 void
2857 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2858                        struct iscsi_nopin *hdr, bool nopout_response)
2859 {
2860         hdr->opcode             = ISCSI_OP_NOOP_IN;
2861         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2862         hton24(hdr->dlength, cmd->buf_ptr_size);
2863         if (nopout_response)
2864                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2865         hdr->itt                = cmd->init_task_tag;
2866         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2867         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2868                                   conn->stat_sn;
2869         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2870
2871         if (nopout_response)
2872                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2873
2874         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2875         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2876
2877         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2878                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2879                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2880                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2881 }
2882 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2883
2884 /*
2885  *      Unsolicited NOPIN, either requesting a response or not.
2886  */
2887 static int iscsit_send_unsolicited_nopin(
2888         struct iscsi_cmd *cmd,
2889         struct iscsi_conn *conn,
2890         int want_response)
2891 {
2892         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2893         int tx_size = ISCSI_HDR_LEN, ret;
2894
2895         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2896
2897         if (conn->conn_ops->HeaderDigest) {
2898                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2899
2900                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2901                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2902
2903                 tx_size += ISCSI_CRC_LEN;
2904                 pr_debug("Attaching CRC32C HeaderDigest to"
2905                         " NopIN 0x%08x\n", *header_digest);
2906         }
2907
2908         cmd->iov_misc[0].iov_base       = cmd->pdu;
2909         cmd->iov_misc[0].iov_len        = tx_size;
2910         cmd->iov_misc_count     = 1;
2911         cmd->tx_size            = tx_size;
2912
2913         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2914                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2915
2916         ret = iscsit_send_tx_data(cmd, conn, 1);
2917         if (ret < 0) {
2918                 iscsit_tx_thread_wait_for_tcp(conn);
2919                 return ret;
2920         }
2921
2922         spin_lock_bh(&cmd->istate_lock);
2923         cmd->i_state = want_response ?
2924                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2925         spin_unlock_bh(&cmd->istate_lock);
2926
2927         return 0;
2928 }
2929
2930 static int
2931 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2932 {
2933         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2934         struct kvec *iov;
2935         u32 padding = 0;
2936         int niov = 0, tx_size;
2937
2938         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2939
2940         tx_size = ISCSI_HDR_LEN;
2941         iov = &cmd->iov_misc[0];
2942         iov[niov].iov_base      = cmd->pdu;
2943         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2944
2945         if (conn->conn_ops->HeaderDigest) {
2946                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2947
2948                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2949                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2950
2951                 iov[0].iov_len += ISCSI_CRC_LEN;
2952                 tx_size += ISCSI_CRC_LEN;
2953                 pr_debug("Attaching CRC32C HeaderDigest"
2954                         " to NopIn 0x%08x\n", *header_digest);
2955         }
2956
2957         /*
2958          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2959          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2960          */
2961         if (cmd->buf_ptr_size) {
2962                 iov[niov].iov_base      = cmd->buf_ptr;
2963                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2964                 tx_size += cmd->buf_ptr_size;
2965
2966                 pr_debug("Echoing back %u bytes of ping"
2967                         " data.\n", cmd->buf_ptr_size);
2968
2969                 padding = ((-cmd->buf_ptr_size) & 3);
2970                 if (padding != 0) {
2971                         iov[niov].iov_base = &cmd->pad_bytes;
2972                         iov[niov++].iov_len = padding;
2973                         tx_size += padding;
2974                         pr_debug("Attaching %u additional"
2975                                 " padding bytes.\n", padding);
2976                 }
2977                 if (conn->conn_ops->DataDigest) {
2978                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2979                                 cmd->buf_ptr, cmd->buf_ptr_size,
2980                                 padding, (u8 *)&cmd->pad_bytes,
2981                                 (u8 *)&cmd->data_crc);
2982
2983                         iov[niov].iov_base = &cmd->data_crc;
2984                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2985                         tx_size += ISCSI_CRC_LEN;
2986                         pr_debug("Attached DataDigest for %u"
2987                                 " bytes of ping data, CRC 0x%08x\n",
2988                                 cmd->buf_ptr_size, cmd->data_crc);
2989                 }
2990         }
2991
2992         cmd->iov_misc_count = niov;
2993         cmd->tx_size = tx_size;
2994
2995         return 0;
2996 }
2997
2998 static int iscsit_send_r2t(
2999         struct iscsi_cmd *cmd,
3000         struct iscsi_conn *conn)
3001 {
3002         int tx_size = 0;
3003         struct iscsi_r2t *r2t;
3004         struct iscsi_r2t_rsp *hdr;
3005         int ret;
3006
3007         r2t = iscsit_get_r2t_from_list(cmd);
3008         if (!r2t)
3009                 return -1;
3010
3011         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3012         memset(hdr, 0, ISCSI_HDR_LEN);
3013         hdr->opcode             = ISCSI_OP_R2T;
3014         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3015         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3016                         (struct scsi_lun *)&hdr->lun);
3017         hdr->itt                = cmd->init_task_tag;
3018         spin_lock_bh(&conn->sess->ttt_lock);
3019         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3020         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3021                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3022         spin_unlock_bh(&conn->sess->ttt_lock);
3023         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3024         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3025         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3026         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3027         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3028         hdr->data_offset        = cpu_to_be32(r2t->offset);
3029         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3030
3031         cmd->iov_misc[0].iov_base       = cmd->pdu;
3032         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3033         tx_size += ISCSI_HDR_LEN;
3034
3035         if (conn->conn_ops->HeaderDigest) {
3036                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3037
3038                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3039                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3040
3041                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3042                 tx_size += ISCSI_CRC_LEN;
3043                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3044                         " PDU 0x%08x\n", *header_digest);
3045         }
3046
3047         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3048                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3049                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3050                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3051                         r2t->offset, r2t->xfer_len, conn->cid);
3052
3053         cmd->iov_misc_count = 1;
3054         cmd->tx_size = tx_size;
3055
3056         spin_lock_bh(&cmd->r2t_lock);
3057         r2t->sent_r2t = 1;
3058         spin_unlock_bh(&cmd->r2t_lock);
3059
3060         ret = iscsit_send_tx_data(cmd, conn, 1);
3061         if (ret < 0) {
3062                 iscsit_tx_thread_wait_for_tcp(conn);
3063                 return ret;
3064         }
3065
3066         spin_lock_bh(&cmd->dataout_timeout_lock);
3067         iscsit_start_dataout_timer(cmd, conn);
3068         spin_unlock_bh(&cmd->dataout_timeout_lock);
3069
3070         return 0;
3071 }
3072
3073 /*
3074  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3075  *              connection recovery.
3076  */
3077 int iscsit_build_r2ts_for_cmd(
3078         struct iscsi_conn *conn,
3079         struct iscsi_cmd *cmd,
3080         bool recovery)
3081 {
3082         int first_r2t = 1;
3083         u32 offset = 0, xfer_len = 0;
3084
3085         spin_lock_bh(&cmd->r2t_lock);
3086         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3087                 spin_unlock_bh(&cmd->r2t_lock);
3088                 return 0;
3089         }
3090
3091         if (conn->sess->sess_ops->DataSequenceInOrder &&
3092             !recovery)
3093                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3094
3095         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3096                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3097                         offset = cmd->r2t_offset;
3098
3099                         if (first_r2t && recovery) {
3100                                 int new_data_end = offset +
3101                                         conn->sess->sess_ops->MaxBurstLength -
3102                                         cmd->next_burst_len;
3103
3104                                 if (new_data_end > cmd->se_cmd.data_length)
3105                                         xfer_len = cmd->se_cmd.data_length - offset;
3106                                 else
3107                                         xfer_len =
3108                                                 conn->sess->sess_ops->MaxBurstLength -
3109                                                 cmd->next_burst_len;
3110                         } else {
3111                                 int new_data_end = offset +
3112                                         conn->sess->sess_ops->MaxBurstLength;
3113
3114                                 if (new_data_end > cmd->se_cmd.data_length)
3115                                         xfer_len = cmd->se_cmd.data_length - offset;
3116                                 else
3117                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3118                         }
3119                         cmd->r2t_offset += xfer_len;
3120
3121                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3122                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3123                 } else {
3124                         struct iscsi_seq *seq;
3125
3126                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3127                         if (!seq) {
3128                                 spin_unlock_bh(&cmd->r2t_lock);
3129                                 return -1;
3130                         }
3131
3132                         offset = seq->offset;
3133                         xfer_len = seq->xfer_len;
3134
3135                         if (cmd->seq_send_order == cmd->seq_count)
3136                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3137                 }
3138                 cmd->outstanding_r2ts++;
3139                 first_r2t = 0;
3140
3141                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3142                         spin_unlock_bh(&cmd->r2t_lock);
3143                         return -1;
3144                 }
3145
3146                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3147                         break;
3148         }
3149         spin_unlock_bh(&cmd->r2t_lock);
3150
3151         return 0;
3152 }
3153
3154 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3155                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3156 {
3157         if (inc_stat_sn)
3158                 cmd->stat_sn = conn->stat_sn++;
3159
3160         spin_lock_bh(&conn->sess->session_stats_lock);
3161         conn->sess->rsp_pdus++;
3162         spin_unlock_bh(&conn->sess->session_stats_lock);
3163
3164         memset(hdr, 0, ISCSI_HDR_LEN);
3165         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3166         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3167         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3168                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3169                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3170         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3171                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3172                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3173         }
3174         hdr->response           = cmd->iscsi_response;
3175         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3176         hdr->itt                = cmd->init_task_tag;
3177         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3178
3179         iscsit_increment_maxcmdsn(cmd, conn->sess);
3180         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3181         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3182
3183         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3184                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3185                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3186                 cmd->se_cmd.scsi_status, conn->cid);
3187 }
3188 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3189
3190 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3191 {
3192         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3193         struct kvec *iov;
3194         u32 padding = 0, tx_size = 0;
3195         int iov_count = 0;
3196         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3197
3198         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3199
3200         iov = &cmd->iov_misc[0];
3201         iov[iov_count].iov_base = cmd->pdu;
3202         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3203         tx_size += ISCSI_HDR_LEN;
3204
3205         /*
3206          * Attach SENSE DATA payload to iSCSI Response PDU
3207          */
3208         if (cmd->se_cmd.sense_buffer &&
3209            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3210             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3211                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3212                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3213
3214                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3215                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3216                 iov[iov_count].iov_base = cmd->sense_buffer;
3217                 iov[iov_count++].iov_len =
3218                                 (cmd->se_cmd.scsi_sense_length + padding);
3219                 tx_size += cmd->se_cmd.scsi_sense_length;
3220
3221                 if (padding) {
3222                         memset(cmd->sense_buffer +
3223                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3224                         tx_size += padding;
3225                         pr_debug("Adding %u bytes of padding to"
3226                                 " SENSE.\n", padding);
3227                 }
3228
3229                 if (conn->conn_ops->DataDigest) {
3230                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3231                                 cmd->sense_buffer,
3232                                 (cmd->se_cmd.scsi_sense_length + padding),
3233                                 0, NULL, (u8 *)&cmd->data_crc);
3234
3235                         iov[iov_count].iov_base    = &cmd->data_crc;
3236                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3237                         tx_size += ISCSI_CRC_LEN;
3238
3239                         pr_debug("Attaching CRC32 DataDigest for"
3240                                 " SENSE, %u bytes CRC 0x%08x\n",
3241                                 (cmd->se_cmd.scsi_sense_length + padding),
3242                                 cmd->data_crc);
3243                 }
3244
3245                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3246                                 " Response PDU\n",
3247                                 cmd->se_cmd.scsi_sense_length);
3248         }
3249
3250         if (conn->conn_ops->HeaderDigest) {
3251                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3252
3253                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3254                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3255
3256                 iov[0].iov_len += ISCSI_CRC_LEN;
3257                 tx_size += ISCSI_CRC_LEN;
3258                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3259                                 " PDU 0x%08x\n", *header_digest);
3260         }
3261
3262         cmd->iov_misc_count = iov_count;
3263         cmd->tx_size = tx_size;
3264
3265         return 0;
3266 }
3267
3268 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3269 {
3270         switch (se_tmr->response) {
3271         case TMR_FUNCTION_COMPLETE:
3272                 return ISCSI_TMF_RSP_COMPLETE;
3273         case TMR_TASK_DOES_NOT_EXIST:
3274                 return ISCSI_TMF_RSP_NO_TASK;
3275         case TMR_LUN_DOES_NOT_EXIST:
3276                 return ISCSI_TMF_RSP_NO_LUN;
3277         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3278                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3279         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3280                 return ISCSI_TMF_RSP_AUTH_FAILED;
3281         case TMR_FUNCTION_REJECTED:
3282         default:
3283                 return ISCSI_TMF_RSP_REJECTED;
3284         }
3285 }
3286
3287 void
3288 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3289                           struct iscsi_tm_rsp *hdr)
3290 {
3291         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3292
3293         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3294         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3295         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3296         hdr->itt                = cmd->init_task_tag;
3297         cmd->stat_sn            = conn->stat_sn++;
3298         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3299
3300         iscsit_increment_maxcmdsn(cmd, conn->sess);
3301         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3302         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3303
3304         pr_debug("Built Task Management Response ITT: 0x%08x,"
3305                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3306                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3307 }
3308 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3309
3310 static int
3311 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3312 {
3313         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3314         u32 tx_size = 0;
3315
3316         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3317
3318         cmd->iov_misc[0].iov_base       = cmd->pdu;
3319         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3320         tx_size += ISCSI_HDR_LEN;
3321
3322         if (conn->conn_ops->HeaderDigest) {
3323                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3324
3325                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3326                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3327
3328                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3329                 tx_size += ISCSI_CRC_LEN;
3330                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3331                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3332         }
3333
3334         cmd->iov_misc_count = 1;
3335         cmd->tx_size = tx_size;
3336
3337         return 0;
3338 }
3339
3340 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3341 {
3342         bool ret = false;
3343
3344         if (np->np_sockaddr.ss_family == AF_INET6) {
3345                 const struct sockaddr_in6 sin6 = {
3346                         .sin6_addr = IN6ADDR_ANY_INIT };
3347                 struct sockaddr_in6 *sock_in6 =
3348                          (struct sockaddr_in6 *)&np->np_sockaddr;
3349
3350                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3351                                 sin6.sin6_addr.s6_addr, 16))
3352                         ret = true;
3353         } else {
3354                 struct sockaddr_in * sock_in =
3355                         (struct sockaddr_in *)&np->np_sockaddr;
3356
3357                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3358                         ret = true;
3359         }
3360
3361         return ret;
3362 }
3363
3364 #define SENDTARGETS_BUF_LIMIT 32768U
3365
3366 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3367 {
3368         char *payload = NULL;
3369         struct iscsi_conn *conn = cmd->conn;
3370         struct iscsi_portal_group *tpg;
3371         struct iscsi_tiqn *tiqn;
3372         struct iscsi_tpg_np *tpg_np;
3373         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3374         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3375
3376         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3377                          SENDTARGETS_BUF_LIMIT);
3378
3379         payload = kzalloc(buffer_len, GFP_KERNEL);
3380         if (!payload) {
3381                 pr_err("Unable to allocate memory for sendtargets"
3382                                 " response.\n");
3383                 return -ENOMEM;
3384         }
3385
3386         spin_lock(&tiqn_lock);
3387         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3388                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3389                 len += 1;
3390
3391                 if ((len + payload_len) > buffer_len) {
3392                         end_of_buf = 1;
3393                         goto eob;
3394                 }
3395                 memcpy(payload + payload_len, buf, len);
3396                 payload_len += len;
3397
3398                 spin_lock(&tiqn->tiqn_tpg_lock);
3399                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3400
3401                         spin_lock(&tpg->tpg_state_lock);
3402                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3403                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3404                                 spin_unlock(&tpg->tpg_state_lock);
3405                                 continue;
3406                         }
3407                         spin_unlock(&tpg->tpg_state_lock);
3408
3409                         spin_lock(&tpg->tpg_np_lock);
3410                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3411                                                 tpg_np_list) {
3412                                 struct iscsi_np *np = tpg_np->tpg_np;
3413                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3414
3415                                 len = sprintf(buf, "TargetAddress="
3416                                         "%s%s%s:%hu,%hu",
3417                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3418                                         "[" : "", (inaddr_any == false) ?
3419                                                 np->np_ip : conn->local_ip,
3420                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3421                                         "]" : "", (inaddr_any == false) ?
3422                                                 np->np_port : conn->local_port,
3423                                         tpg->tpgt);
3424                                 len += 1;
3425
3426                                 if ((len + payload_len) > buffer_len) {
3427                                         spin_unlock(&tpg->tpg_np_lock);
3428                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3429                                         end_of_buf = 1;
3430                                         goto eob;
3431                                 }
3432                                 memcpy(payload + payload_len, buf, len);
3433                                 payload_len += len;
3434                         }
3435                         spin_unlock(&tpg->tpg_np_lock);
3436                 }
3437                 spin_unlock(&tiqn->tiqn_tpg_lock);
3438 eob:
3439                 if (end_of_buf)
3440                         break;
3441         }
3442         spin_unlock(&tiqn_lock);
3443
3444         cmd->buf_ptr = payload;
3445
3446         return payload_len;
3447 }
3448
3449 /*
3450  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3451  *      MaxRecvDataSegmentLength.
3452  */
3453 static int iscsit_send_text_rsp(
3454         struct iscsi_cmd *cmd,
3455         struct iscsi_conn *conn)
3456 {
3457         struct iscsi_text_rsp *hdr;
3458         struct kvec *iov;
3459         u32 padding = 0, tx_size = 0;
3460         int text_length, iov_count = 0;
3461
3462         text_length = iscsit_build_sendtargets_response(cmd);
3463         if (text_length < 0)
3464                 return text_length;
3465
3466         padding = ((-text_length) & 3);
3467         if (padding != 0) {
3468                 memset(cmd->buf_ptr + text_length, 0, padding);
3469                 pr_debug("Attaching %u additional bytes for"
3470                         " padding.\n", padding);
3471         }
3472
3473         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3474         memset(hdr, 0, ISCSI_HDR_LEN);
3475         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3476         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3477         hton24(hdr->dlength, text_length);
3478         hdr->itt                = cmd->init_task_tag;
3479         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3480         cmd->stat_sn            = conn->stat_sn++;
3481         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3482
3483         iscsit_increment_maxcmdsn(cmd, conn->sess);
3484         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3485         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3486
3487         iov = &cmd->iov_misc[0];
3488
3489         iov[iov_count].iov_base = cmd->pdu;
3490         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3491         iov[iov_count].iov_base = cmd->buf_ptr;
3492         iov[iov_count++].iov_len = text_length + padding;
3493
3494         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3495
3496         if (conn->conn_ops->HeaderDigest) {
3497                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3498
3499                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3500                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3501
3502                 iov[0].iov_len += ISCSI_CRC_LEN;
3503                 tx_size += ISCSI_CRC_LEN;
3504                 pr_debug("Attaching CRC32 HeaderDigest for"
3505                         " Text Response PDU 0x%08x\n", *header_digest);
3506         }
3507
3508         if (conn->conn_ops->DataDigest) {
3509                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3510                                 cmd->buf_ptr, (text_length + padding),
3511                                 0, NULL, (u8 *)&cmd->data_crc);
3512
3513                 iov[iov_count].iov_base = &cmd->data_crc;
3514                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3515                 tx_size += ISCSI_CRC_LEN;
3516
3517                 pr_debug("Attaching DataDigest for %u bytes of text"
3518                         " data, CRC 0x%08x\n", (text_length + padding),
3519                         cmd->data_crc);
3520         }
3521
3522         cmd->iov_misc_count = iov_count;
3523         cmd->tx_size = tx_size;
3524
3525         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3526                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3527                         text_length, conn->cid);
3528         return 0;
3529 }
3530
3531 void
3532 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3533                     struct iscsi_reject *hdr)
3534 {
3535         hdr->opcode             = ISCSI_OP_REJECT;
3536         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3537         hton24(hdr->dlength, ISCSI_HDR_LEN);
3538         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3539         cmd->stat_sn            = conn->stat_sn++;
3540         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3541         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3542         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3543
3544 }
3545 EXPORT_SYMBOL(iscsit_build_reject);
3546
3547 static int iscsit_send_reject(
3548         struct iscsi_cmd *cmd,
3549         struct iscsi_conn *conn)
3550 {
3551         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3552         struct kvec *iov;
3553         u32 iov_count = 0, tx_size;
3554
3555         iscsit_build_reject(cmd, conn, hdr);
3556
3557         iov = &cmd->iov_misc[0];
3558         iov[iov_count].iov_base = cmd->pdu;
3559         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3560         iov[iov_count].iov_base = cmd->buf_ptr;
3561         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3562
3563         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3564
3565         if (conn->conn_ops->HeaderDigest) {
3566                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3567
3568                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3569                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3570
3571                 iov[0].iov_len += ISCSI_CRC_LEN;
3572                 tx_size += ISCSI_CRC_LEN;
3573                 pr_debug("Attaching CRC32 HeaderDigest for"
3574                         " REJECT PDU 0x%08x\n", *header_digest);
3575         }
3576
3577         if (conn->conn_ops->DataDigest) {
3578                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3579                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3580
3581                 iov[iov_count].iov_base = &cmd->data_crc;
3582                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3583                 tx_size += ISCSI_CRC_LEN;
3584                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3585                                 " PDU 0x%08x\n", cmd->data_crc);
3586         }
3587
3588         cmd->iov_misc_count = iov_count;
3589         cmd->tx_size = tx_size;
3590
3591         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3592                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3593
3594         return 0;
3595 }
3596
3597 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3598 {
3599         struct iscsi_thread_set *ts = conn->thread_set;
3600         int ord, cpu;
3601         /*
3602          * thread_id is assigned from iscsit_global->ts_bitmap from
3603          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3604          *
3605          * Here we use thread_id to determine which CPU that this
3606          * iSCSI connection's iscsi_thread_set will be scheduled to
3607          * execute upon.
3608          */
3609         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3610         for_each_online_cpu(cpu) {
3611                 if (ord-- == 0) {
3612                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3613                         return;
3614                 }
3615         }
3616         /*
3617          * This should never be reached..
3618          */
3619         dump_stack();
3620         cpumask_setall(conn->conn_cpumask);
3621 }
3622
3623 static inline void iscsit_thread_check_cpumask(
3624         struct iscsi_conn *conn,
3625         struct task_struct *p,
3626         int mode)
3627 {
3628         char buf[128];
3629         /*
3630          * mode == 1 signals iscsi_target_tx_thread() usage.
3631          * mode == 0 signals iscsi_target_rx_thread() usage.
3632          */
3633         if (mode == 1) {
3634                 if (!conn->conn_tx_reset_cpumask)
3635                         return;
3636                 conn->conn_tx_reset_cpumask = 0;
3637         } else {
3638                 if (!conn->conn_rx_reset_cpumask)
3639                         return;
3640                 conn->conn_rx_reset_cpumask = 0;
3641         }
3642         /*
3643          * Update the CPU mask for this single kthread so that
3644          * both TX and RX kthreads are scheduled to run on the
3645          * same CPU.
3646          */
3647         memset(buf, 0, 128);
3648         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3649         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3650 }
3651
3652 static int
3653 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3654 {
3655         int ret;
3656
3657         switch (state) {
3658         case ISTATE_SEND_R2T:
3659                 ret = iscsit_send_r2t(cmd, conn);
3660                 if (ret < 0)
3661                         goto err;
3662                 break;
3663         case ISTATE_REMOVE:
3664                 spin_lock_bh(&conn->cmd_lock);
3665                 list_del(&cmd->i_conn_node);
3666                 spin_unlock_bh(&conn->cmd_lock);
3667
3668                 iscsit_free_cmd(cmd, false);
3669                 break;
3670         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3671                 iscsit_mod_nopin_response_timer(conn);
3672                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3673                 if (ret < 0)
3674                         goto err;
3675                 break;
3676         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3677                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3678                 if (ret < 0)
3679                         goto err;
3680                 break;
3681         default:
3682                 pr_err("Unknown Opcode: 0x%02x ITT:"
3683                        " 0x%08x, i_state: %d on CID: %hu\n",
3684                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3685                        conn->cid);
3686                 goto err;
3687         }
3688
3689         return 0;
3690
3691 err:
3692         return -1;
3693 }
3694
3695 static int
3696 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3697 {
3698         struct iscsit_transport *t = conn->conn_transport;
3699         struct iscsi_queue_req *qr;
3700         struct iscsi_cmd *cmd;
3701         u8 state;
3702         int ret;
3703
3704         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3705                 atomic_set(&conn->check_immediate_queue, 0);
3706                 cmd = qr->cmd;
3707                 state = qr->state;
3708                 kmem_cache_free(lio_qr_cache, qr);
3709
3710                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3711                 if (ret < 0)
3712                         return ret;
3713         }
3714
3715         return 0;
3716 }
3717
3718 static int
3719 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3720 {
3721         int ret;
3722
3723 check_rsp_state:
3724         switch (state) {
3725         case ISTATE_SEND_DATAIN:
3726                 ret = iscsit_send_datain(cmd, conn);
3727                 if (ret < 0)
3728                         goto err;
3729                 else if (!ret)
3730                         /* more drs */
3731                         goto check_rsp_state;
3732                 else if (ret == 1) {
3733                         /* all done */
3734                         spin_lock_bh(&cmd->istate_lock);
3735                         cmd->i_state = ISTATE_SENT_STATUS;
3736                         spin_unlock_bh(&cmd->istate_lock);
3737
3738                         if (atomic_read(&conn->check_immediate_queue))
3739                                 return 1;
3740
3741                         return 0;
3742                 } else if (ret == 2) {
3743                         /* Still must send status,
3744                            SCF_TRANSPORT_TASK_SENSE was set */
3745                         spin_lock_bh(&cmd->istate_lock);
3746                         cmd->i_state = ISTATE_SEND_STATUS;
3747                         spin_unlock_bh(&cmd->istate_lock);
3748                         state = ISTATE_SEND_STATUS;
3749                         goto check_rsp_state;
3750                 }
3751
3752                 break;
3753         case ISTATE_SEND_STATUS:
3754         case ISTATE_SEND_STATUS_RECOVERY:
3755                 ret = iscsit_send_response(cmd, conn);
3756                 break;
3757         case ISTATE_SEND_LOGOUTRSP:
3758                 ret = iscsit_send_logout(cmd, conn);
3759                 break;
3760         case ISTATE_SEND_ASYNCMSG:
3761                 ret = iscsit_send_conn_drop_async_message(
3762                         cmd, conn);
3763                 break;
3764         case ISTATE_SEND_NOPIN:
3765                 ret = iscsit_send_nopin(cmd, conn);
3766                 break;
3767         case ISTATE_SEND_REJECT:
3768                 ret = iscsit_send_reject(cmd, conn);
3769                 break;
3770         case ISTATE_SEND_TASKMGTRSP:
3771                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3772                 if (ret != 0)
3773                         break;
3774                 ret = iscsit_tmr_post_handler(cmd, conn);
3775                 if (ret != 0)
3776                         iscsit_fall_back_to_erl0(conn->sess);
3777                 break;
3778         case ISTATE_SEND_TEXTRSP:
3779                 ret = iscsit_send_text_rsp(cmd, conn);
3780                 break;
3781         default:
3782                 pr_err("Unknown Opcode: 0x%02x ITT:"
3783                        " 0x%08x, i_state: %d on CID: %hu\n",
3784                        cmd->iscsi_opcode, cmd->init_task_tag,
3785                        state, conn->cid);
3786                 goto err;
3787         }
3788         if (ret < 0)
3789                 goto err;
3790
3791         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3792                 iscsit_tx_thread_wait_for_tcp(conn);
3793                 iscsit_unmap_iovec(cmd);
3794                 goto err;
3795         }
3796         iscsit_unmap_iovec(cmd);
3797
3798         switch (state) {
3799         case ISTATE_SEND_LOGOUTRSP:
3800                 if (!iscsit_logout_post_handler(cmd, conn))
3801                         goto restart;
3802                 /* fall through */
3803         case ISTATE_SEND_STATUS:
3804         case ISTATE_SEND_ASYNCMSG:
3805         case ISTATE_SEND_NOPIN:
3806         case ISTATE_SEND_STATUS_RECOVERY:
3807         case ISTATE_SEND_TEXTRSP:
3808         case ISTATE_SEND_TASKMGTRSP:
3809                 spin_lock_bh(&cmd->istate_lock);
3810                 cmd->i_state = ISTATE_SENT_STATUS;
3811                 spin_unlock_bh(&cmd->istate_lock);
3812                 break;
3813         case ISTATE_SEND_REJECT:
3814                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3815                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3816                         complete(&cmd->reject_comp);
3817                         goto err;
3818                 }
3819                 complete(&cmd->reject_comp);
3820                 break;
3821         default:
3822                 pr_err("Unknown Opcode: 0x%02x ITT:"
3823                        " 0x%08x, i_state: %d on CID: %hu\n",
3824                        cmd->iscsi_opcode, cmd->init_task_tag,
3825                        cmd->i_state, conn->cid);
3826                 goto err;
3827         }
3828
3829         if (atomic_read(&conn->check_immediate_queue))
3830                 return 1;
3831
3832         return 0;
3833
3834 err:
3835         return -1;
3836 restart:
3837         return -EAGAIN;
3838 }
3839
3840 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3841 {
3842         struct iscsit_transport *t = conn->conn_transport;
3843         struct iscsi_queue_req *qr;
3844         struct iscsi_cmd *cmd;
3845         u8 state;
3846         int ret;
3847
3848         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3849                 cmd = qr->cmd;
3850                 state = qr->state;
3851                 kmem_cache_free(lio_qr_cache, qr);
3852
3853                 ret = t->iscsit_response_queue(conn, cmd, state);
3854                 if (ret == 1 || ret < 0)
3855                         return ret;
3856         }
3857
3858         return 0;
3859 }
3860
3861 int iscsi_target_tx_thread(void *arg)
3862 {
3863         int ret = 0;
3864         struct iscsi_conn *conn;
3865         struct iscsi_thread_set *ts = arg;
3866         /*
3867          * Allow ourselves to be interrupted by SIGINT so that a
3868          * connection recovery / failure event can be triggered externally.
3869          */
3870         allow_signal(SIGINT);
3871
3872 restart:
3873         conn = iscsi_tx_thread_pre_handler(ts);
3874         if (!conn)
3875                 goto out;
3876
3877         ret = 0;
3878
3879         while (!kthread_should_stop()) {
3880                 /*
3881                  * Ensure that both TX and RX per connection kthreads
3882                  * are scheduled to run on the same CPU.
3883                  */
3884                 iscsit_thread_check_cpumask(conn, current, 1);
3885
3886                 wait_event_interruptible(conn->queues_wq,
3887                                          !iscsit_conn_all_queues_empty(conn) ||
3888                                          ts->status == ISCSI_THREAD_SET_RESET);
3889
3890                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3891                      signal_pending(current))
3892                         goto transport_err;
3893
3894 get_immediate:
3895                 ret = iscsit_handle_immediate_queue(conn);
3896                 if (ret < 0)
3897                         goto transport_err;
3898
3899                 ret = iscsit_handle_response_queue(conn);
3900                 if (ret == 1)
3901                         goto get_immediate;
3902                 else if (ret == -EAGAIN)
3903                         goto restart;
3904                 else if (ret < 0)
3905                         goto transport_err;
3906         }
3907
3908 transport_err:
3909         iscsit_take_action_for_connection_exit(conn);
3910         goto restart;
3911 out:
3912         return 0;
3913 }
3914
3915 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3916 {
3917         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3918         struct iscsi_cmd *cmd;
3919         int ret = 0;
3920
3921         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3922         case ISCSI_OP_SCSI_CMD:
3923                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3924                 if (!cmd)
3925                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3926                                                 1, buf, conn);
3927
3928                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3929                 break;
3930         case ISCSI_OP_SCSI_DATA_OUT:
3931                 ret = iscsit_handle_data_out(conn, buf);
3932                 break;
3933         case ISCSI_OP_NOOP_OUT:
3934                 cmd = NULL;
3935                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3936                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3937                         if (!cmd)
3938                                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3939                                                 1, buf, conn);
3940                 }
3941                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3942                 break;
3943         case ISCSI_OP_SCSI_TMFUNC:
3944                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3945                 if (!cmd)
3946                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3947                                                 1, buf, conn);
3948
3949                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3950                 break;
3951         case ISCSI_OP_TEXT:
3952                 ret = iscsit_handle_text_cmd(conn, buf);
3953                 break;
3954         case ISCSI_OP_LOGOUT:
3955                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3956                 if (!cmd)
3957                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3958                                                 1, buf, conn);
3959
3960                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3961                 if (ret > 0)
3962                         wait_for_completion_timeout(&conn->conn_logout_comp,
3963                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3964                 break;
3965         case ISCSI_OP_SNACK:
3966                 ret = iscsit_handle_snack(conn, buf);
3967                 break;
3968         default:
3969                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3970                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3971                         pr_err("Cannot recover from unknown"
3972                         " opcode while ERL=0, closing iSCSI connection.\n");
3973                         return -1;
3974                 }
3975                 if (!conn->conn_ops->OFMarker) {
3976                         pr_err("Unable to recover from unknown"
3977                         " opcode while OFMarker=No, closing iSCSI"
3978                                 " connection.\n");
3979                         return -1;
3980                 }
3981                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3982                         pr_err("Unable to recover from unknown"
3983                                 " opcode, closing iSCSI connection.\n");
3984                         return -1;
3985                 }
3986                 break;
3987         }
3988
3989         return ret;
3990 }
3991
3992 int iscsi_target_rx_thread(void *arg)
3993 {
3994         int ret;
3995         u8 buffer[ISCSI_HDR_LEN], opcode;
3996         u32 checksum = 0, digest = 0;
3997         struct iscsi_conn *conn = NULL;
3998         struct iscsi_thread_set *ts = arg;
3999         struct kvec iov;
4000         /*
4001          * Allow ourselves to be interrupted by SIGINT so that a
4002          * connection recovery / failure event can be triggered externally.
4003          */
4004         allow_signal(SIGINT);
4005
4006 restart:
4007         conn = iscsi_rx_thread_pre_handler(ts);
4008         if (!conn)
4009                 goto out;
4010
4011         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4012                 struct completion comp;
4013                 int rc;
4014
4015                 init_completion(&comp);
4016                 rc = wait_for_completion_interruptible(&comp);
4017                 if (rc < 0)
4018                         goto transport_err;
4019
4020                 goto out;
4021         }
4022
4023         while (!kthread_should_stop()) {
4024                 /*
4025                  * Ensure that both TX and RX per connection kthreads
4026                  * are scheduled to run on the same CPU.
4027                  */
4028                 iscsit_thread_check_cpumask(conn, current, 0);
4029
4030                 memset(buffer, 0, ISCSI_HDR_LEN);
4031                 memset(&iov, 0, sizeof(struct kvec));
4032
4033                 iov.iov_base    = buffer;
4034                 iov.iov_len     = ISCSI_HDR_LEN;
4035
4036                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4037                 if (ret != ISCSI_HDR_LEN) {
4038                         iscsit_rx_thread_wait_for_tcp(conn);
4039                         goto transport_err;
4040                 }
4041
4042                 /*
4043                  * Set conn->bad_hdr for use with REJECT PDUs.
4044                  */
4045                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4046
4047                 if (conn->conn_ops->HeaderDigest) {
4048                         iov.iov_base    = &digest;
4049                         iov.iov_len     = ISCSI_CRC_LEN;
4050
4051                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4052                         if (ret != ISCSI_CRC_LEN) {
4053                                 iscsit_rx_thread_wait_for_tcp(conn);
4054                                 goto transport_err;
4055                         }
4056
4057                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4058                                         buffer, ISCSI_HDR_LEN,
4059                                         0, NULL, (u8 *)&checksum);
4060
4061                         if (digest != checksum) {
4062                                 pr_err("HeaderDigest CRC32C failed,"
4063                                         " received 0x%08x, computed 0x%08x\n",
4064                                         digest, checksum);
4065                                 /*
4066                                  * Set the PDU to 0xff so it will intentionally
4067                                  * hit default in the switch below.
4068                                  */
4069                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4070                                 spin_lock_bh(&conn->sess->session_stats_lock);
4071                                 conn->sess->conn_digest_errors++;
4072                                 spin_unlock_bh(&conn->sess->session_stats_lock);
4073                         } else {
4074                                 pr_debug("Got HeaderDigest CRC32C"
4075                                                 " 0x%08x\n", checksum);
4076                         }
4077                 }
4078
4079                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4080                         goto transport_err;
4081
4082                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4083
4084                 if (conn->sess->sess_ops->SessionType &&
4085                    ((!(opcode & ISCSI_OP_TEXT)) ||
4086                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4087                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4088                         " while in Discovery Session, rejecting.\n", opcode);
4089                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
4090                                         buffer, conn);
4091                         goto transport_err;
4092                 }
4093
4094                 ret = iscsi_target_rx_opcode(conn, buffer);
4095                 if (ret < 0)
4096                         goto transport_err;
4097         }
4098
4099 transport_err:
4100         if (!signal_pending(current))
4101                 atomic_set(&conn->transport_failed, 1);
4102         iscsit_take_action_for_connection_exit(conn);
4103         goto restart;
4104 out:
4105         return 0;
4106 }
4107
4108 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4109 {
4110         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4111         struct iscsi_session *sess = conn->sess;
4112         /*
4113          * We expect this function to only ever be called from either RX or TX
4114          * thread context via iscsit_close_connection() once the other context
4115          * has been reset -> returned sleeping pre-handler state.
4116          */
4117         spin_lock_bh(&conn->cmd_lock);
4118         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4119
4120                 list_del(&cmd->i_conn_node);
4121                 spin_unlock_bh(&conn->cmd_lock);
4122
4123                 iscsit_increment_maxcmdsn(cmd, sess);
4124
4125                 iscsit_free_cmd(cmd, true);
4126
4127                 spin_lock_bh(&conn->cmd_lock);
4128         }
4129         spin_unlock_bh(&conn->cmd_lock);
4130 }
4131
4132 static void iscsit_stop_timers_for_cmds(
4133         struct iscsi_conn *conn)
4134 {
4135         struct iscsi_cmd *cmd;
4136
4137         spin_lock_bh(&conn->cmd_lock);
4138         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4139                 if (cmd->data_direction == DMA_TO_DEVICE)
4140                         iscsit_stop_dataout_timer(cmd);
4141         }
4142         spin_unlock_bh(&conn->cmd_lock);
4143 }
4144
4145 int iscsit_close_connection(
4146         struct iscsi_conn *conn)
4147 {
4148         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4149         struct iscsi_session    *sess = conn->sess;
4150
4151         pr_debug("Closing iSCSI connection CID %hu on SID:"
4152                 " %u\n", conn->cid, sess->sid);
4153         /*
4154          * Always up conn_logout_comp just in case the RX Thread is sleeping
4155          * and the logout response never got sent because the connection
4156          * failed.
4157          */
4158         complete(&conn->conn_logout_comp);
4159
4160         iscsi_release_thread_set(conn);
4161
4162         iscsit_stop_timers_for_cmds(conn);
4163         iscsit_stop_nopin_response_timer(conn);
4164         iscsit_stop_nopin_timer(conn);
4165         iscsit_free_queue_reqs_for_conn(conn);
4166
4167         /*
4168          * During Connection recovery drop unacknowledged out of order
4169          * commands for this connection, and prepare the other commands
4170          * for realligence.
4171          *
4172          * During normal operation clear the out of order commands (but
4173          * do not free the struct iscsi_ooo_cmdsn's) and release all
4174          * struct iscsi_cmds.
4175          */
4176         if (atomic_read(&conn->connection_recovery)) {
4177                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4178                 iscsit_prepare_cmds_for_realligance(conn);
4179         } else {
4180                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4181                 iscsit_release_commands_from_conn(conn);
4182         }
4183
4184         /*
4185          * Handle decrementing session or connection usage count if
4186          * a logout response was not able to be sent because the
4187          * connection failed.  Fall back to Session Recovery here.
4188          */
4189         if (atomic_read(&conn->conn_logout_remove)) {
4190                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4191                         iscsit_dec_conn_usage_count(conn);
4192                         iscsit_dec_session_usage_count(sess);
4193                 }
4194                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4195                         iscsit_dec_conn_usage_count(conn);
4196
4197                 atomic_set(&conn->conn_logout_remove, 0);
4198                 atomic_set(&sess->session_reinstatement, 0);
4199                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4200         }
4201
4202         spin_lock_bh(&sess->conn_lock);
4203         list_del(&conn->conn_list);
4204
4205         /*
4206          * Attempt to let the Initiator know this connection failed by
4207          * sending an Connection Dropped Async Message on another
4208          * active connection.
4209          */
4210         if (atomic_read(&conn->connection_recovery))
4211                 iscsit_build_conn_drop_async_message(conn);
4212
4213         spin_unlock_bh(&sess->conn_lock);
4214
4215         /*
4216          * If connection reinstatement is being performed on this connection,
4217          * up the connection reinstatement semaphore that is being blocked on
4218          * in iscsit_cause_connection_reinstatement().
4219          */
4220         spin_lock_bh(&conn->state_lock);
4221         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4222                 spin_unlock_bh(&conn->state_lock);
4223                 complete(&conn->conn_wait_comp);
4224                 wait_for_completion(&conn->conn_post_wait_comp);
4225                 spin_lock_bh(&conn->state_lock);
4226         }
4227
4228         /*
4229          * If connection reinstatement is being performed on this connection
4230          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4231          * connection wait rcfr semaphore that is being blocked on
4232          * an iscsit_connection_reinstatement_rcfr().
4233          */
4234         if (atomic_read(&conn->connection_wait_rcfr)) {
4235                 spin_unlock_bh(&conn->state_lock);
4236                 complete(&conn->conn_wait_rcfr_comp);
4237                 wait_for_completion(&conn->conn_post_wait_comp);
4238                 spin_lock_bh(&conn->state_lock);
4239         }
4240         atomic_set(&conn->connection_reinstatement, 1);
4241         spin_unlock_bh(&conn->state_lock);
4242
4243         /*
4244          * If any other processes are accessing this connection pointer we
4245          * must wait until they have completed.
4246          */
4247         iscsit_check_conn_usage_count(conn);
4248
4249         if (conn->conn_rx_hash.tfm)
4250                 crypto_free_hash(conn->conn_rx_hash.tfm);
4251         if (conn->conn_tx_hash.tfm)
4252                 crypto_free_hash(conn->conn_tx_hash.tfm);
4253
4254         if (conn->conn_cpumask)
4255                 free_cpumask_var(conn->conn_cpumask);
4256
4257         kfree(conn->conn_ops);
4258         conn->conn_ops = NULL;
4259
4260         if (conn->sock)
4261                 sock_release(conn->sock);
4262
4263         if (conn->conn_transport->iscsit_free_conn)
4264                 conn->conn_transport->iscsit_free_conn(conn);
4265
4266         iscsit_put_transport(conn->conn_transport);
4267
4268         conn->thread_set = NULL;
4269
4270         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4271         conn->conn_state = TARG_CONN_STATE_FREE;
4272         kfree(conn);
4273
4274         spin_lock_bh(&sess->conn_lock);
4275         atomic_dec(&sess->nconn);
4276         pr_debug("Decremented iSCSI connection count to %hu from node:"
4277                 " %s\n", atomic_read(&sess->nconn),
4278                 sess->sess_ops->InitiatorName);
4279         /*
4280          * Make sure that if one connection fails in an non ERL=2 iSCSI
4281          * Session that they all fail.
4282          */
4283         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4284              !atomic_read(&sess->session_logout))
4285                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4286
4287         /*
4288          * If this was not the last connection in the session, and we are
4289          * performing session reinstatement or falling back to ERL=0, call
4290          * iscsit_stop_session() without sleeping to shutdown the other
4291          * active connections.
4292          */
4293         if (atomic_read(&sess->nconn)) {
4294                 if (!atomic_read(&sess->session_reinstatement) &&
4295                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4296                         spin_unlock_bh(&sess->conn_lock);
4297                         return 0;
4298                 }
4299                 if (!atomic_read(&sess->session_stop_active)) {
4300                         atomic_set(&sess->session_stop_active, 1);
4301                         spin_unlock_bh(&sess->conn_lock);
4302                         iscsit_stop_session(sess, 0, 0);
4303                         return 0;
4304                 }
4305                 spin_unlock_bh(&sess->conn_lock);
4306                 return 0;
4307         }
4308
4309         /*
4310          * If this was the last connection in the session and one of the
4311          * following is occurring:
4312          *
4313          * Session Reinstatement is not being performed, and are falling back
4314          * to ERL=0 call iscsit_close_session().
4315          *
4316          * Session Logout was requested.  iscsit_close_session() will be called
4317          * elsewhere.
4318          *
4319          * Session Continuation is not being performed, start the Time2Retain
4320          * handler and check if sleep_on_sess_wait_sem is active.
4321          */
4322         if (!atomic_read(&sess->session_reinstatement) &&
4323              atomic_read(&sess->session_fall_back_to_erl0)) {
4324                 spin_unlock_bh(&sess->conn_lock);
4325                 target_put_session(sess->se_sess);
4326
4327                 return 0;
4328         } else if (atomic_read(&sess->session_logout)) {
4329                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4330                 sess->session_state = TARG_SESS_STATE_FREE;
4331                 spin_unlock_bh(&sess->conn_lock);
4332
4333                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4334                         complete(&sess->session_wait_comp);
4335
4336                 return 0;
4337         } else {
4338                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4339                 sess->session_state = TARG_SESS_STATE_FAILED;
4340
4341                 if (!atomic_read(&sess->session_continuation)) {
4342                         spin_unlock_bh(&sess->conn_lock);
4343                         iscsit_start_time2retain_handler(sess);
4344                 } else
4345                         spin_unlock_bh(&sess->conn_lock);
4346
4347                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4348                         complete(&sess->session_wait_comp);
4349
4350                 return 0;
4351         }
4352         spin_unlock_bh(&sess->conn_lock);
4353
4354         return 0;
4355 }
4356
4357 int iscsit_close_session(struct iscsi_session *sess)
4358 {
4359         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4360         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4361
4362         if (atomic_read(&sess->nconn)) {
4363                 pr_err("%d connection(s) still exist for iSCSI session"
4364                         " to %s\n", atomic_read(&sess->nconn),
4365                         sess->sess_ops->InitiatorName);
4366                 BUG();
4367         }
4368
4369         spin_lock_bh(&se_tpg->session_lock);
4370         atomic_set(&sess->session_logout, 1);
4371         atomic_set(&sess->session_reinstatement, 1);
4372         iscsit_stop_time2retain_timer(sess);
4373         spin_unlock_bh(&se_tpg->session_lock);
4374
4375         /*
4376          * transport_deregister_session_configfs() will clear the
4377          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4378          * can be setting it again with __transport_register_session() in
4379          * iscsi_post_login_handler() again after the iscsit_stop_session()
4380          * completes in iscsi_np context.
4381          */
4382         transport_deregister_session_configfs(sess->se_sess);
4383
4384         /*
4385          * If any other processes are accessing this session pointer we must
4386          * wait until they have completed.  If we are in an interrupt (the
4387          * time2retain handler) and contain and active session usage count we
4388          * restart the timer and exit.
4389          */
4390         if (!in_interrupt()) {
4391                 if (iscsit_check_session_usage_count(sess) == 1)
4392                         iscsit_stop_session(sess, 1, 1);
4393         } else {
4394                 if (iscsit_check_session_usage_count(sess) == 2) {
4395                         atomic_set(&sess->session_logout, 0);
4396                         iscsit_start_time2retain_handler(sess);
4397                         return 0;
4398                 }
4399         }
4400
4401         transport_deregister_session(sess->se_sess);
4402
4403         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4404                 iscsit_free_connection_recovery_entires(sess);
4405
4406         iscsit_free_all_ooo_cmdsns(sess);
4407
4408         spin_lock_bh(&se_tpg->session_lock);
4409         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4410         sess->session_state = TARG_SESS_STATE_FREE;
4411         pr_debug("Released iSCSI session from node: %s\n",
4412                         sess->sess_ops->InitiatorName);
4413         tpg->nsessions--;
4414         if (tpg->tpg_tiqn)
4415                 tpg->tpg_tiqn->tiqn_nsessions--;
4416
4417         pr_debug("Decremented number of active iSCSI Sessions on"
4418                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4419
4420         spin_lock(&sess_idr_lock);
4421         idr_remove(&sess_idr, sess->session_index);
4422         spin_unlock(&sess_idr_lock);
4423
4424         kfree(sess->sess_ops);
4425         sess->sess_ops = NULL;
4426         spin_unlock_bh(&se_tpg->session_lock);
4427
4428         kfree(sess);
4429         return 0;
4430 }
4431
4432 static void iscsit_logout_post_handler_closesession(
4433         struct iscsi_conn *conn)
4434 {
4435         struct iscsi_session *sess = conn->sess;
4436
4437         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4438         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4439
4440         atomic_set(&conn->conn_logout_remove, 0);
4441         complete(&conn->conn_logout_comp);
4442
4443         iscsit_dec_conn_usage_count(conn);
4444         iscsit_stop_session(sess, 1, 1);
4445         iscsit_dec_session_usage_count(sess);
4446         target_put_session(sess->se_sess);
4447 }
4448
4449 static void iscsit_logout_post_handler_samecid(
4450         struct iscsi_conn *conn)
4451 {
4452         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4453         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4454
4455         atomic_set(&conn->conn_logout_remove, 0);
4456         complete(&conn->conn_logout_comp);
4457
4458         iscsit_cause_connection_reinstatement(conn, 1);
4459         iscsit_dec_conn_usage_count(conn);
4460 }
4461
4462 static void iscsit_logout_post_handler_diffcid(
4463         struct iscsi_conn *conn,
4464         u16 cid)
4465 {
4466         struct iscsi_conn *l_conn;
4467         struct iscsi_session *sess = conn->sess;
4468
4469         if (!sess)
4470                 return;
4471
4472         spin_lock_bh(&sess->conn_lock);
4473         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4474                 if (l_conn->cid == cid) {
4475                         iscsit_inc_conn_usage_count(l_conn);
4476                         break;
4477                 }
4478         }
4479         spin_unlock_bh(&sess->conn_lock);
4480
4481         if (!l_conn)
4482                 return;
4483
4484         if (l_conn->sock)
4485                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4486
4487         spin_lock_bh(&l_conn->state_lock);
4488         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4489         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4490         spin_unlock_bh(&l_conn->state_lock);
4491
4492         iscsit_cause_connection_reinstatement(l_conn, 1);
4493         iscsit_dec_conn_usage_count(l_conn);
4494 }
4495
4496 /*
4497  *      Return of 0 causes the TX thread to restart.
4498  */
4499 int iscsit_logout_post_handler(
4500         struct iscsi_cmd *cmd,
4501         struct iscsi_conn *conn)
4502 {
4503         int ret = 0;
4504
4505         switch (cmd->logout_reason) {
4506         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4507                 switch (cmd->logout_response) {
4508                 case ISCSI_LOGOUT_SUCCESS:
4509                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4510                 default:
4511                         iscsit_logout_post_handler_closesession(conn);
4512                         break;
4513                 }
4514                 ret = 0;
4515                 break;
4516         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4517                 if (conn->cid == cmd->logout_cid) {
4518                         switch (cmd->logout_response) {
4519                         case ISCSI_LOGOUT_SUCCESS:
4520                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4521                         default:
4522                                 iscsit_logout_post_handler_samecid(conn);
4523                                 break;
4524                         }
4525                         ret = 0;
4526                 } else {
4527                         switch (cmd->logout_response) {
4528                         case ISCSI_LOGOUT_SUCCESS:
4529                                 iscsit_logout_post_handler_diffcid(conn,
4530                                         cmd->logout_cid);
4531                                 break;
4532                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4533                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4534                         default:
4535                                 break;
4536                         }
4537                         ret = 1;
4538                 }
4539                 break;
4540         case ISCSI_LOGOUT_REASON_RECOVERY:
4541                 switch (cmd->logout_response) {
4542                 case ISCSI_LOGOUT_SUCCESS:
4543                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4544                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4545                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4546                 default:
4547                         break;
4548                 }
4549                 ret = 1;
4550                 break;
4551         default:
4552                 break;
4553
4554         }
4555         return ret;
4556 }
4557 EXPORT_SYMBOL(iscsit_logout_post_handler);
4558
4559 void iscsit_fail_session(struct iscsi_session *sess)
4560 {
4561         struct iscsi_conn *conn;
4562
4563         spin_lock_bh(&sess->conn_lock);
4564         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4565                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4566                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4567         }
4568         spin_unlock_bh(&sess->conn_lock);
4569
4570         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4571         sess->session_state = TARG_SESS_STATE_FAILED;
4572 }
4573
4574 int iscsit_free_session(struct iscsi_session *sess)
4575 {
4576         u16 conn_count = atomic_read(&sess->nconn);
4577         struct iscsi_conn *conn, *conn_tmp = NULL;
4578         int is_last;
4579
4580         spin_lock_bh(&sess->conn_lock);
4581         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4582
4583         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4584                         conn_list) {
4585                 if (conn_count == 0)
4586                         break;
4587
4588                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4589                         is_last = 1;
4590                 } else {
4591                         iscsit_inc_conn_usage_count(conn_tmp);
4592                         is_last = 0;
4593                 }
4594                 iscsit_inc_conn_usage_count(conn);
4595
4596                 spin_unlock_bh(&sess->conn_lock);
4597                 iscsit_cause_connection_reinstatement(conn, 1);
4598                 spin_lock_bh(&sess->conn_lock);
4599
4600                 iscsit_dec_conn_usage_count(conn);
4601                 if (is_last == 0)
4602                         iscsit_dec_conn_usage_count(conn_tmp);
4603
4604                 conn_count--;
4605         }
4606
4607         if (atomic_read(&sess->nconn)) {
4608                 spin_unlock_bh(&sess->conn_lock);
4609                 wait_for_completion(&sess->session_wait_comp);
4610         } else
4611                 spin_unlock_bh(&sess->conn_lock);
4612
4613         target_put_session(sess->se_sess);
4614         return 0;
4615 }
4616
4617 void iscsit_stop_session(
4618         struct iscsi_session *sess,
4619         int session_sleep,
4620         int connection_sleep)
4621 {
4622         u16 conn_count = atomic_read(&sess->nconn);
4623         struct iscsi_conn *conn, *conn_tmp = NULL;
4624         int is_last;
4625
4626         spin_lock_bh(&sess->conn_lock);
4627         if (session_sleep)
4628                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4629
4630         if (connection_sleep) {
4631                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4632                                 conn_list) {
4633                         if (conn_count == 0)
4634                                 break;
4635
4636                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4637                                 is_last = 1;
4638                         } else {
4639                                 iscsit_inc_conn_usage_count(conn_tmp);
4640                                 is_last = 0;
4641                         }
4642                         iscsit_inc_conn_usage_count(conn);
4643
4644                         spin_unlock_bh(&sess->conn_lock);
4645                         iscsit_cause_connection_reinstatement(conn, 1);
4646                         spin_lock_bh(&sess->conn_lock);
4647
4648                         iscsit_dec_conn_usage_count(conn);
4649                         if (is_last == 0)
4650                                 iscsit_dec_conn_usage_count(conn_tmp);
4651                         conn_count--;
4652                 }
4653         } else {
4654                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4655                         iscsit_cause_connection_reinstatement(conn, 0);
4656         }
4657
4658         if (session_sleep && atomic_read(&sess->nconn)) {
4659                 spin_unlock_bh(&sess->conn_lock);
4660                 wait_for_completion(&sess->session_wait_comp);
4661         } else
4662                 spin_unlock_bh(&sess->conn_lock);
4663 }
4664
4665 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4666 {
4667         struct iscsi_session *sess;
4668         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4669         struct se_session *se_sess, *se_sess_tmp;
4670         int session_count = 0;
4671
4672         spin_lock_bh(&se_tpg->session_lock);
4673         if (tpg->nsessions && !force) {
4674                 spin_unlock_bh(&se_tpg->session_lock);
4675                 return -1;
4676         }
4677
4678         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4679                         sess_list) {
4680                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4681
4682                 spin_lock(&sess->conn_lock);
4683                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4684                     atomic_read(&sess->session_logout) ||
4685                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4686                         spin_unlock(&sess->conn_lock);
4687                         continue;
4688                 }
4689                 atomic_set(&sess->session_reinstatement, 1);
4690                 spin_unlock(&sess->conn_lock);
4691                 spin_unlock_bh(&se_tpg->session_lock);
4692
4693                 iscsit_free_session(sess);
4694                 spin_lock_bh(&se_tpg->session_lock);
4695
4696                 session_count++;
4697         }
4698         spin_unlock_bh(&se_tpg->session_lock);
4699
4700         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4701                         " Group: %hu\n", session_count, tpg->tpgt);
4702         return 0;
4703 }
4704
4705 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4706 MODULE_VERSION("4.1.x");
4707 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4708 MODULE_LICENSE("GPL");
4709
4710 module_init(iscsi_target_init_module);
4711 module_exit(iscsi_target_cleanup_module);