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 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_SPINLOCK(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_cmd_cache;
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         unsigned char *buf, u32);
  72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  73
  74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  75 {
  76         struct iscsi_tiqn *tiqn = NULL;
  77
  78         spin_lock(&tiqn_lock);
  79         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  80                 if (!strcmp(tiqn->tiqn, buf)) {
  81
  82                         spin_lock(&tiqn->tiqn_state_lock);
  83                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  84                                 tiqn->tiqn_access_count++;
  85                                 spin_unlock(&tiqn->tiqn_state_lock);
  86                                 spin_unlock(&tiqn_lock);
  87                                 return tiqn;
  88                         }
  89                         spin_unlock(&tiqn->tiqn_state_lock);
  90                 }
  91         }
  92         spin_unlock(&tiqn_lock);
  93
  94         return NULL;
  95 }
  96
  97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  98 {
  99         spin_lock(&tiqn->tiqn_state_lock);
 100         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 101                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 102                 spin_unlock(&tiqn->tiqn_state_lock);
 103                 return 0;
 104         }
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106
 107         return -1;
 108 }
 109
 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 111 {
 112         spin_lock(&tiqn->tiqn_state_lock);
 113         tiqn->tiqn_access_count--;
 114         spin_unlock(&tiqn->tiqn_state_lock);
 115 }
 116
 117 /*
 118  * Note that IQN formatting is expected to be done in userspace, and
 119  * no explict IQN format checks are done here.
 120  */
 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 122 {
 123         struct iscsi_tiqn *tiqn = NULL;
 124         int ret;
 125
 126         if (strlen(buf) >= ISCSI_IQN_LEN) {
 127                 pr_err("Target IQN exceeds %d bytes\n",
 128                                 ISCSI_IQN_LEN);
 129                 return ERR_PTR(-EINVAL);
 130         }
 131
 132         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 133         if (!tiqn) {
 134                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 135                 return ERR_PTR(-ENOMEM);
 136         }
 137
 138         sprintf(tiqn->tiqn, "%s", buf);
 139         INIT_LIST_HEAD(&tiqn->tiqn_list);
 140         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 141         spin_lock_init(&tiqn->tiqn_state_lock);
 142         spin_lock_init(&tiqn->tiqn_tpg_lock);
 143         spin_lock_init(&tiqn->sess_err_stats.lock);
 144         spin_lock_init(&tiqn->login_stats.lock);
 145         spin_lock_init(&tiqn->logout_stats.lock);
 146
 147         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 148                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 149                 kfree(tiqn);
 150                 return ERR_PTR(-ENOMEM);
 151         }
 152         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 153
 154         spin_lock(&tiqn_lock);
 155         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 156         if (ret < 0) {
 157                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 158                 spin_unlock(&tiqn_lock);
 159                 kfree(tiqn);
 160                 return ERR_PTR(ret);
 161         }
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163         spin_unlock(&tiqn_lock);
 164
 165         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 166
 167         return tiqn;
 168
 169 }
 170
 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 172 {
 173         /*
 174          * Wait for accesses to said struct iscsi_tiqn to end.
 175          */
 176         spin_lock(&tiqn->tiqn_state_lock);
 177         while (tiqn->tiqn_access_count != 0) {
 178                 spin_unlock(&tiqn->tiqn_state_lock);
 179                 msleep(10);
 180                 spin_lock(&tiqn->tiqn_state_lock);
 181         }
 182         spin_unlock(&tiqn->tiqn_state_lock);
 183 }
 184
 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 186 {
 187         /*
 188          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 189          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 190          * attempts to access this struct iscsi_tiqn will fail from both transport
 191          * fabric and control code paths.
 192          */
 193         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 194                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 195                 return;
 196         }
 197
 198         iscsit_wait_for_tiqn(tiqn);
 199
 200         spin_lock(&tiqn_lock);
 201         list_del(&tiqn->tiqn_list);
 202         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 203         spin_unlock(&tiqn_lock);
 204
 205         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 206                         tiqn->tiqn);
 207         kfree(tiqn);
 208 }
 209
 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 211 {
 212         int ret;
 213         /*
 214          * Determine if the network portal is accepting storage traffic.
 215          */
 216         spin_lock_bh(&np->np_thread_lock);
 217         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 218                 spin_unlock_bh(&np->np_thread_lock);
 219                 return -1;
 220         }
 221         if (np->np_login_tpg) {
 222                 pr_err("np->np_login_tpg() is not NULL!\n");
 223                 spin_unlock_bh(&np->np_thread_lock);
 224                 return -1;
 225         }
 226         spin_unlock_bh(&np->np_thread_lock);
 227         /*
 228          * Determine if the portal group is accepting storage traffic.
 229          */
 230         spin_lock_bh(&tpg->tpg_state_lock);
 231         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 232                 spin_unlock_bh(&tpg->tpg_state_lock);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         /*
 238          * Here we serialize access across the TIQN+TPG Tuple.
 239          */
 240         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 241         if ((ret != 0) || signal_pending(current))
 242                 return -1;
 243
 244         spin_lock_bh(&np->np_thread_lock);
 245         np->np_login_tpg = tpg;
 246         spin_unlock_bh(&np->np_thread_lock);
 247
 248         return 0;
 249 }
 250
 251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 252 {
 253         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 254
 255         spin_lock_bh(&np->np_thread_lock);
 256         np->np_login_tpg = NULL;
 257         spin_unlock_bh(&np->np_thread_lock);
 258
 259         mutex_unlock(&tpg->np_login_lock);
 260
 261         if (tiqn)
 262                 iscsit_put_tiqn_for_login(tiqn);
 263
 264         return 0;
 265 }
 266
 267 static struct iscsi_np *iscsit_get_np(
 268         struct __kernel_sockaddr_storage *sockaddr,
 269         int network_transport)
 270 {
 271         struct sockaddr_in *sock_in, *sock_in_e;
 272         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 273         struct iscsi_np *np;
 274         int ip_match = 0;
 275         u16 port;
 276
 277         spin_lock_bh(&np_lock);
 278         list_for_each_entry(np, &g_np_list, np_list) {
 279                 spin_lock(&np->np_thread_lock);
 280                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 281                         spin_unlock(&np->np_thread_lock);
 282                         continue;
 283                 }
 284
 285                 if (sockaddr->ss_family == AF_INET6) {
 286                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 287                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 288
 289                         if (!memcmp(&sock_in6->sin6_addr.in6_u,
 290                                     &sock_in6_e->sin6_addr.in6_u,
 291                                     sizeof(struct in6_addr)))
 292                                 ip_match = 1;
 293
 294                         port = ntohs(sock_in6->sin6_port);
 295                 } else {
 296                         sock_in = (struct sockaddr_in *)sockaddr;
 297                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 298
 299                         if (sock_in->sin_addr.s_addr ==
 300                             sock_in_e->sin_addr.s_addr)
 301                                 ip_match = 1;
 302
 303                         port = ntohs(sock_in->sin_port);
 304                 }
 305
 306                 if ((ip_match == 1) && (np->np_port == port) &&
 307                     (np->np_network_transport == network_transport)) {
 308                         /*
 309                          * Increment the np_exports reference count now to
 310                          * prevent iscsit_del_np() below from being called
 311                          * while iscsi_tpg_add_network_portal() is called.
 312                          */
 313                         np->np_exports++;
 314                         spin_unlock(&np->np_thread_lock);
 315                         spin_unlock_bh(&np_lock);
 316                         return np;
 317                 }
 318                 spin_unlock(&np->np_thread_lock);
 319         }
 320         spin_unlock_bh(&np_lock);
 321
 322         return NULL;
 323 }
 324
 325 struct iscsi_np *iscsit_add_np(
 326         struct __kernel_sockaddr_storage *sockaddr,
 327         char *ip_str,
 328         int network_transport)
 329 {
 330         struct sockaddr_in *sock_in;
 331         struct sockaddr_in6 *sock_in6;
 332         struct iscsi_np *np;
 333         int ret;
 334         /*
 335          * Locate the existing struct iscsi_np if already active..
 336          */
 337         np = iscsit_get_np(sockaddr, network_transport);
 338         if (np)
 339                 return np;
 340
 341         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 342         if (!np) {
 343                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 344                 return ERR_PTR(-ENOMEM);
 345         }
 346
 347         np->np_flags |= NPF_IP_NETWORK;
 348         if (sockaddr->ss_family == AF_INET6) {
 349                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 350                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 351                 np->np_port = ntohs(sock_in6->sin6_port);
 352         } else {
 353                 sock_in = (struct sockaddr_in *)sockaddr;
 354                 sprintf(np->np_ip, "%s", ip_str);
 355                 np->np_port = ntohs(sock_in->sin_port);
 356         }
 357
 358         np->np_network_transport = network_transport;
 359         spin_lock_init(&np->np_thread_lock);
 360         init_completion(&np->np_restart_comp);
 361         INIT_LIST_HEAD(&np->np_list);
 362
 363         ret = iscsi_target_setup_login_socket(np, sockaddr);
 364         if (ret != 0) {
 365                 kfree(np);
 366                 return ERR_PTR(ret);
 367         }
 368
 369         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 370         if (IS_ERR(np->np_thread)) {
 371                 pr_err("Unable to create kthread: iscsi_np\n");
 372                 ret = PTR_ERR(np->np_thread);
 373                 kfree(np);
 374                 return ERR_PTR(ret);
 375         }
 376         /*
 377          * Increment the np_exports reference count now to prevent
 378          * iscsit_del_np() below from being run while a new call to
 379          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 380          * active.  We don't need to hold np->np_thread_lock at this
 381          * point because iscsi_np has not been added to g_np_list yet.
 382          */
 383         np->np_exports = 1;
 384
 385         spin_lock_bh(&np_lock);
 386         list_add_tail(&np->np_list, &g_np_list);
 387         spin_unlock_bh(&np_lock);
 388
 389         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 390                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 391                 "TCP" : "SCTP");
 392
 393         return np;
 394 }
 395
 396 int iscsit_reset_np_thread(
 397         struct iscsi_np *np,
 398         struct iscsi_tpg_np *tpg_np,
 399         struct iscsi_portal_group *tpg)
 400 {
 401         spin_lock_bh(&np->np_thread_lock);
 402         if (tpg && tpg_np) {
 403                 /*
 404                  * The reset operation need only be performed when the
 405                  * passed struct iscsi_portal_group has a login in progress
 406                  * to one of the network portals.
 407                  */
 408                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 409                         spin_unlock_bh(&np->np_thread_lock);
 410                         return 0;
 411                 }
 412         }
 413         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 414                 spin_unlock_bh(&np->np_thread_lock);
 415                 return 0;
 416         }
 417         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 418
 419         if (np->np_thread) {
 420                 spin_unlock_bh(&np->np_thread_lock);
 421                 send_sig(SIGINT, np->np_thread, 1);
 422                 wait_for_completion(&np->np_restart_comp);
 423                 spin_lock_bh(&np->np_thread_lock);
 424         }
 425         spin_unlock_bh(&np->np_thread_lock);
 426
 427         return 0;
 428 }
 429
 430 int iscsit_del_np_comm(struct iscsi_np *np)
 431 {
 432         if (!np->np_socket)
 433                 return 0;
 434
 435         /*
 436          * Some network transports allocate their own struct sock->file,
 437          * see  if we need to free any additional allocated resources.
 438          */
 439         if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 440                 kfree(np->np_socket->file);
 441                 np->np_socket->file = NULL;
 442         }
 443
 444         sock_release(np->np_socket);
 445         return 0;
 446 }
 447
 448 int iscsit_del_np(struct iscsi_np *np)
 449 {
 450         spin_lock_bh(&np->np_thread_lock);
 451         np->np_exports--;
 452         if (np->np_exports) {
 453                 spin_unlock_bh(&np->np_thread_lock);
 454                 return 0;
 455         }
 456         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 457         spin_unlock_bh(&np->np_thread_lock);
 458
 459         if (np->np_thread) {
 460                 /*
 461                  * We need to send the signal to wakeup Linux/Net
 462                  * which may be sleeping in sock_accept()..
 463                  */
 464                 send_sig(SIGINT, np->np_thread, 1);
 465                 kthread_stop(np->np_thread);
 466         }
 467         iscsit_del_np_comm(np);
 468
 469         spin_lock_bh(&np_lock);
 470         list_del(&np->np_list);
 471         spin_unlock_bh(&np_lock);
 472
 473         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 474                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 475                 "TCP" : "SCTP");
 476
 477         kfree(np);
 478         return 0;
 479 }
 480
 481 static int __init iscsi_target_init_module(void)
 482 {
 483         int ret = 0;
 484
 485         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 486
 487         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 488         if (!iscsit_global) {
 489                 pr_err("Unable to allocate memory for iscsit_global\n");
 490                 return -1;
 491         }
 492         mutex_init(&auth_id_lock);
 493         spin_lock_init(&sess_idr_lock);
 494         idr_init(&tiqn_idr);
 495         idr_init(&sess_idr);
 496
 497         ret = iscsi_target_register_configfs();
 498         if (ret < 0)
 499                 goto out;
 500
 501         ret = iscsi_thread_set_init();
 502         if (ret < 0)
 503                 goto configfs_out;
 504
 505         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 506                         TARGET_THREAD_SET_COUNT) {
 507                 pr_err("iscsi_allocate_thread_sets() returned"
 508                         " unexpected value!\n");
 509                 goto ts_out1;
 510         }
 511
 512         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 513                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 514                         0, NULL);
 515         if (!lio_cmd_cache) {
 516                 pr_err("Unable to kmem_cache_create() for"
 517                                 " lio_cmd_cache\n");
 518                 goto ts_out2;
 519         }
 520
 521         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 522                         sizeof(struct iscsi_queue_req),
 523                         __alignof__(struct iscsi_queue_req), 0, NULL);
 524         if (!lio_qr_cache) {
 525                 pr_err("nable to kmem_cache_create() for"
 526                                 " lio_qr_cache\n");
 527                 goto cmd_out;
 528         }
 529
 530         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 531                         sizeof(struct iscsi_datain_req),
 532                         __alignof__(struct iscsi_datain_req), 0, NULL);
 533         if (!lio_dr_cache) {
 534                 pr_err("Unable to kmem_cache_create() for"
 535                                 " lio_dr_cache\n");
 536                 goto qr_out;
 537         }
 538
 539         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 540                         sizeof(struct iscsi_ooo_cmdsn),
 541                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 542         if (!lio_ooo_cache) {
 543                 pr_err("Unable to kmem_cache_create() for"
 544                                 " lio_ooo_cache\n");
 545                 goto dr_out;
 546         }
 547
 548         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 549                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 550                         0, NULL);
 551         if (!lio_r2t_cache) {
 552                 pr_err("Unable to kmem_cache_create() for"
 553                                 " lio_r2t_cache\n");
 554                 goto ooo_out;
 555         }
 556
 557         if (iscsit_load_discovery_tpg() < 0)
 558                 goto r2t_out;
 559
 560         return ret;
 561 r2t_out:
 562         kmem_cache_destroy(lio_r2t_cache);
 563 ooo_out:
 564         kmem_cache_destroy(lio_ooo_cache);
 565 dr_out:
 566         kmem_cache_destroy(lio_dr_cache);
 567 qr_out:
 568         kmem_cache_destroy(lio_qr_cache);
 569 cmd_out:
 570         kmem_cache_destroy(lio_cmd_cache);
 571 ts_out2:
 572         iscsi_deallocate_thread_sets();
 573 ts_out1:
 574         iscsi_thread_set_free();
 575 configfs_out:
 576         iscsi_target_deregister_configfs();
 577 out:
 578         kfree(iscsit_global);
 579         return -ENOMEM;
 580 }
 581
 582 static void __exit iscsi_target_cleanup_module(void)
 583 {
 584         iscsi_deallocate_thread_sets();
 585         iscsi_thread_set_free();
 586         iscsit_release_discovery_tpg();
 587         kmem_cache_destroy(lio_cmd_cache);
 588         kmem_cache_destroy(lio_qr_cache);
 589         kmem_cache_destroy(lio_dr_cache);
 590         kmem_cache_destroy(lio_ooo_cache);
 591         kmem_cache_destroy(lio_r2t_cache);
 592
 593         iscsi_target_deregister_configfs();
 594
 595         kfree(iscsit_global);
 596 }
 597
 598 static int iscsit_add_reject(
 599         u8 reason,
 600         int fail_conn,
 601         unsigned char *buf,
 602         struct iscsi_conn *conn)
 603 {
 604         struct iscsi_cmd *cmd;
 605         struct iscsi_reject *hdr;
 606         int ret;
 607
 608         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 609         if (!cmd)
 610                 return -1;
 611
 612         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 613         if (fail_conn)
 614                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 615
 616         hdr     = (struct iscsi_reject *) cmd->pdu;
 617         hdr->reason = reason;
 618
 619         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 620         if (!cmd->buf_ptr) {
 621                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 622                 iscsit_release_cmd(cmd);
 623                 return -1;
 624         }
 625
 626         spin_lock_bh(&conn->cmd_lock);
 627         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 628         spin_unlock_bh(&conn->cmd_lock);
 629
 630         cmd->i_state = ISTATE_SEND_REJECT;
 631         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 632
 633         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 634         if (ret != 0)
 635                 return -1;
 636
 637         return (!fail_conn) ? 0 : -1;
 638 }
 639
 640 int iscsit_add_reject_from_cmd(
 641         u8 reason,
 642         int fail_conn,
 643         int add_to_conn,
 644         unsigned char *buf,
 645         struct iscsi_cmd *cmd)
 646 {
 647         struct iscsi_conn *conn;
 648         struct iscsi_reject *hdr;
 649         int ret;
 650
 651         if (!cmd->conn) {
 652                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 653                                 cmd->init_task_tag);
 654                 return -1;
 655         }
 656         conn = cmd->conn;
 657
 658         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 659         if (fail_conn)
 660                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 661
 662         hdr     = (struct iscsi_reject *) cmd->pdu;
 663         hdr->reason = reason;
 664
 665         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 666         if (!cmd->buf_ptr) {
 667                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 668                 iscsit_release_cmd(cmd);
 669                 return -1;
 670         }
 671
 672         if (add_to_conn) {
 673                 spin_lock_bh(&conn->cmd_lock);
 674                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 675                 spin_unlock_bh(&conn->cmd_lock);
 676         }
 677
 678         cmd->i_state = ISTATE_SEND_REJECT;
 679         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 680
 681         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 682         if (ret != 0)
 683                 return -1;
 684
 685         return (!fail_conn) ? 0 : -1;
 686 }
 687
 688 /*
 689  * Map some portion of the allocated scatterlist to an iovec, suitable for
 690  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 691  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 692  * either case (see iscsit_alloc_buffs)
 693  */
 694 static int iscsit_map_iovec(
 695         struct iscsi_cmd *cmd,
 696         struct kvec *iov,
 697         u32 data_offset,
 698         u32 data_length)
 699 {
 700         u32 i = 0;
 701         struct scatterlist *sg;
 702         unsigned int page_off;
 703
 704         /*
 705          * We have a private mapping of the allocated pages in t_mem_sg.
 706          * At this point, we also know each contains a page.
 707          */
 708         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 709         page_off = (data_offset % PAGE_SIZE);
 710
 711         cmd->first_data_sg = sg;
 712         cmd->first_data_sg_off = page_off;
 713
 714         while (data_length) {
 715                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 716
 717                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 718                 iov[i].iov_len = cur_len;
 719
 720                 data_length -= cur_len;
 721                 page_off = 0;
 722                 sg = sg_next(sg);
 723                 i++;
 724         }
 725
 726         cmd->kmapped_nents = i;
 727
 728         return i;
 729 }
 730
 731 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 732 {
 733         u32 i;
 734         struct scatterlist *sg;
 735
 736         sg = cmd->first_data_sg;
 737
 738         for (i = 0; i < cmd->kmapped_nents; i++)
 739                 kunmap(sg_page(&sg[i]));
 740 }
 741
 742 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 743 {
 744         struct iscsi_cmd *cmd;
 745
 746         conn->exp_statsn = exp_statsn;
 747
 748         spin_lock_bh(&conn->cmd_lock);
 749         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 750                 spin_lock(&cmd->istate_lock);
 751                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 752                     (cmd->stat_sn < exp_statsn)) {
 753                         cmd->i_state = ISTATE_REMOVE;
 754                         spin_unlock(&cmd->istate_lock);
 755                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 756                                                 cmd->i_state);
 757                         continue;
 758                 }
 759                 spin_unlock(&cmd->istate_lock);
 760         }
 761         spin_unlock_bh(&conn->cmd_lock);
 762 }
 763
 764 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 765 {
 766         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 767                                 cmd->se_cmd.t_data_nents;
 768
 769         iov_count += ISCSI_IOV_DATA_BUFFER;
 770
 771         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 772         if (!cmd->iov_data) {
 773                 pr_err("Unable to allocate cmd->iov_data\n");
 774                 return -ENOMEM;
 775         }
 776
 777         cmd->orig_iov_data_count = iov_count;
 778         return 0;
 779 }
 780
 781 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 782 {
 783         struct scatterlist *sgl;
 784         u32 length = cmd->se_cmd.data_length;
 785         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 786         int i = 0, j = 0, ret;
 787         /*
 788          * If no SCSI payload is present, allocate the default iovecs used for
 789          * iSCSI PDU Header
 790          */
 791         if (!length)
 792                 return iscsit_allocate_iovecs(cmd);
 793
 794         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 795         if (!sgl)
 796                 return -ENOMEM;
 797
 798         sg_init_table(sgl, nents);
 799
 800         while (length) {
 801                 int buf_size = min_t(int, length, PAGE_SIZE);
 802                 struct page *page;
 803
 804                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 805                 if (!page)
 806                         goto page_alloc_failed;
 807
 808                 sg_set_page(&sgl[i], page, buf_size, 0);
 809
 810                 length -= buf_size;
 811                 i++;
 812         }
 813
 814         cmd->t_mem_sg = sgl;
 815         cmd->t_mem_sg_nents = nents;
 816
 817         /* BIDI ops not supported */
 818
 819         /* Tell the core about our preallocated memory */
 820         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 821         /*
 822          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 823          * so that cmd->se_cmd.t_tasks_se_num has been set.
 824          */
 825         ret = iscsit_allocate_iovecs(cmd);
 826         if (ret < 0)
 827                 return -ENOMEM;
 828
 829         return 0;
 830
 831 page_alloc_failed:
 832         while (j < i)
 833                 __free_page(sg_page(&sgl[j++]));
 834
 835         kfree(sgl);
 836         return -ENOMEM;
 837 }
 838
 839 static int iscsit_handle_scsi_cmd(
 840         struct iscsi_conn *conn,
 841         unsigned char *buf)
 842 {
 843         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 844         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 845         struct iscsi_cmd        *cmd = NULL;
 846         struct iscsi_scsi_req *hdr;
 847         int iscsi_task_attr;
 848         int sam_task_attr;
 849
 850         spin_lock_bh(&conn->sess->session_stats_lock);
 851         conn->sess->cmd_pdus++;
 852         if (conn->sess->se_sess->se_node_acl) {
 853                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 854                 conn->sess->se_sess->se_node_acl->num_cmds++;
 855                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 856         }
 857         spin_unlock_bh(&conn->sess->session_stats_lock);
 858
 859         hdr                     = (struct iscsi_scsi_req *) buf;
 860         payload_length          = ntoh24(hdr->dlength);
 861         hdr->itt                = be32_to_cpu(hdr->itt);
 862         hdr->data_length        = be32_to_cpu(hdr->data_length);
 863         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 864         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 865
 866         /* FIXME; Add checks for AdditionalHeaderSegment */
 867
 868         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 869             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 870                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 871                                 " not set. Bad iSCSI Initiator.\n");
 872                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 873                                 buf, conn);
 874         }
 875
 876         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 877              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 878                 /*
 879                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 880                  * that adds support for RESERVE/RELEASE.  There is a bug
 881                  * add with this new functionality that sets R/W bits when
 882                  * neither CDB carries any READ or WRITE datapayloads.
 883                  */
 884                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 885                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 886                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 887                         goto done;
 888                 }
 889
 890                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 891                         " set when Expected Data Transfer Length is 0 for"
 892                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 893                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 894                                 buf, conn);
 895         }
 896 done:
 897
 898         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 899             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 900                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 901                         " MUST be set if Expected Data Transfer Length is not 0."
 902                         " Bad iSCSI Initiator\n");
 903                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 904                                 buf, conn);
 905         }
 906
 907         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 908             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 909                 pr_err("Bidirectional operations not supported!\n");
 910                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 911                                 buf, conn);
 912         }
 913
 914         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 915                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 916                                 " Scsi Command PDU.\n");
 917                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 918                                 buf, conn);
 919         }
 920
 921         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 922                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 923                         " protocol error.\n", payload_length);
 924                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 925                                 buf, conn);
 926         }
 927
 928         if ((hdr->data_length == payload_length) &&
 929             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 930                 pr_err("Expected Data Transfer Length and Length of"
 931                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 932                         " bit is not set protocol error\n");
 933                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 934                                 buf, conn);
 935         }
 936
 937         if (payload_length > hdr->data_length) {
 938                 pr_err("DataSegmentLength: %u is greater than"
 939                         " EDTL: %u, protocol error.\n", payload_length,
 940                                 hdr->data_length);
 941                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 942                                 buf, conn);
 943         }
 944
 945         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 946                 pr_err("DataSegmentLength: %u is greater than"
 947                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 948                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 949                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 950                                 buf, conn);
 951         }
 952
 953         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 954                 pr_err("DataSegmentLength: %u is greater than"
 955                         " FirstBurstLength: %u, protocol error.\n",
 956                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 957                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 958                                         buf, conn);
 959         }
 960
 961         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 962                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 963                           DMA_NONE;
 964
 965         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 966         if (!cmd)
 967                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 968                                          buf, conn);
 969
 970         cmd->data_direction = data_direction;
 971         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 972         /*
 973          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 974          */
 975         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 976             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 977                 sam_task_attr = MSG_SIMPLE_TAG;
 978         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 979                 sam_task_attr = MSG_ORDERED_TAG;
 980         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 981                 sam_task_attr = MSG_HEAD_TAG;
 982         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 983                 sam_task_attr = MSG_ACA_TAG;
 984         else {
 985                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 986                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 987                 sam_task_attr = MSG_SIMPLE_TAG;
 988         }
 989
 990         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 991         cmd->i_state            = ISTATE_NEW_CMD;
 992         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 993         cmd->immediate_data     = (payload_length) ? 1 : 0;
 994         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 995                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 996         if (cmd->unsolicited_data)
 997                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 998
 999         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1000         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
1001                 spin_lock_bh(&conn->sess->ttt_lock);
1002                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1003                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
1004                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1005                 spin_unlock_bh(&conn->sess->ttt_lock);
1006         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
1007                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1008         cmd->cmd_sn             = hdr->cmdsn;
1009         cmd->exp_stat_sn        = hdr->exp_statsn;
1010         cmd->first_burst_len    = payload_length;
1011
1012         if (cmd->data_direction == DMA_FROM_DEVICE) {
1013                 struct iscsi_datain_req *dr;
1014
1015                 dr = iscsit_allocate_datain_req();
1016                 if (!dr)
1017                         return iscsit_add_reject_from_cmd(
1018                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1019                                         1, 1, buf, cmd);
1020
1021                 iscsit_attach_datain_req(cmd, dr);
1022         }
1023
1024         /*
1025          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1026          */
1027         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
1028                         conn->sess->se_sess, hdr->data_length, cmd->data_direction,
1029                         sam_task_attr, &cmd->sense_buffer[0]);
1030
1031         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1032                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1033                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
1034
1035         /*
1036          * The CDB is going to an se_device_t.
1037          */
1038         ret = transport_lookup_cmd_lun(&cmd->se_cmd,
1039                                        scsilun_to_int(&hdr->lun));
1040         if (ret < 0) {
1041                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1042                         pr_debug("Responding to non-acl'ed,"
1043                                 " non-existent or non-exported iSCSI LUN:"
1044                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1045                 }
1046                 send_check_condition = 1;
1047                 goto attach_cmd;
1048         }
1049
1050         transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1051         if (transport_ret == -ENOMEM) {
1052                 return iscsit_add_reject_from_cmd(
1053                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1054                                 1, 1, buf, cmd);
1055         } else if (transport_ret < 0) {
1056                 /*
1057                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1058                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1059                  * Mechinism.
1060                  */
1061                 send_check_condition = 1;
1062         } else {
1063                 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
1064                         return iscsit_add_reject_from_cmd(
1065                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1066                                 1, 1, buf, cmd);
1067         }
1068
1069 attach_cmd:
1070         spin_lock_bh(&conn->cmd_lock);
1071         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1072         spin_unlock_bh(&conn->cmd_lock);
1073         /*
1074          * Check if we need to delay processing because of ALUA
1075          * Active/NonOptimized primary access state..
1076          */
1077         core_alua_check_nonop_delay(&cmd->se_cmd);
1078         /*
1079          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1080          * also call iscsit_allocate_iovecs()
1081          */
1082         ret = iscsit_alloc_buffs(cmd);
1083         if (ret < 0)
1084                 return iscsit_add_reject_from_cmd(
1085                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1086                                 1, 0, buf, cmd);
1087         /*
1088          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1089          * the Immediate Bit is not set, and no Immediate
1090          * Data is attached.
1091          *
1092          * A PDU/CmdSN carrying Immediate Data can only
1093          * be processed after the DataCRC has passed.
1094          * If the DataCRC fails, the CmdSN MUST NOT
1095          * be acknowledged. (See below)
1096          */
1097         if (!cmd->immediate_data) {
1098                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1099                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1100                         return 0;
1101                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1102                         return iscsit_add_reject_from_cmd(
1103                                 ISCSI_REASON_PROTOCOL_ERROR,
1104                                 1, 0, buf, cmd);
1105         }
1106
1107         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1108
1109         /*
1110          * If no Immediate Data is attached, it's OK to return now.
1111          */
1112         if (!cmd->immediate_data) {
1113                 if (send_check_condition)
1114                         return 0;
1115
1116                 if (cmd->unsolicited_data) {
1117                         iscsit_set_dataout_sequence_values(cmd);
1118
1119                         spin_lock_bh(&cmd->dataout_timeout_lock);
1120                         iscsit_start_dataout_timer(cmd, cmd->conn);
1121                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1122                 }
1123
1124                 return 0;
1125         }
1126
1127         /*
1128          * Early CHECK_CONDITIONs never make it to the transport processing
1129          * thread.  They are processed in CmdSN order by
1130          * iscsit_check_received_cmdsn() below.
1131          */
1132         if (send_check_condition) {
1133                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1134                 dump_immediate_data = 1;
1135                 goto after_immediate_data;
1136         }
1137         /*
1138          * Call directly into transport_generic_new_cmd() to perform
1139          * the backend memory allocation.
1140          */
1141         ret = transport_generic_new_cmd(&cmd->se_cmd);
1142         if (ret < 0) {
1143                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1144                 dump_immediate_data = 1;
1145                 goto after_immediate_data;
1146         }
1147
1148         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1149 after_immediate_data:
1150         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1151                 /*
1152                  * A PDU/CmdSN carrying Immediate Data passed
1153                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1154                  * Immediate Bit is not set.
1155                  */
1156                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1157                 /*
1158                  * Special case for Unsupported SAM WRITE Opcodes
1159                  * and ImmediateData=Yes.
1160                  */
1161                 if (dump_immediate_data) {
1162                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1163                                 return -1;
1164                 } else if (cmd->unsolicited_data) {
1165                         iscsit_set_dataout_sequence_values(cmd);
1166
1167                         spin_lock_bh(&cmd->dataout_timeout_lock);
1168                         iscsit_start_dataout_timer(cmd, cmd->conn);
1169                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1170                 }
1171
1172                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1173                         return iscsit_add_reject_from_cmd(
1174                                 ISCSI_REASON_PROTOCOL_ERROR,
1175                                 1, 0, buf, cmd);
1176
1177         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1178                 /*
1179                  * Immediate Data failed DataCRC and ERL>=1,
1180                  * silently drop this PDU and let the initiator
1181                  * plug the CmdSN gap.
1182                  *
1183                  * FIXME: Send Unsolicited NOPIN with reserved
1184                  * TTT here to help the initiator figure out
1185                  * the missing CmdSN, although they should be
1186                  * intelligent enough to determine the missing
1187                  * CmdSN and issue a retry to plug the sequence.
1188                  */
1189                 cmd->i_state = ISTATE_REMOVE;
1190                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1191         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1192                 return -1;
1193
1194         return 0;
1195 }
1196
1197 static u32 iscsit_do_crypto_hash_sg(
1198         struct hash_desc *hash,
1199         struct iscsi_cmd *cmd,
1200         u32 data_offset,
1201         u32 data_length,
1202         u32 padding,
1203         u8 *pad_bytes)
1204 {
1205         u32 data_crc;
1206         u32 i;
1207         struct scatterlist *sg;
1208         unsigned int page_off;
1209
1210         crypto_hash_init(hash);
1211
1212         sg = cmd->first_data_sg;
1213         page_off = cmd->first_data_sg_off;
1214
1215         i = 0;
1216         while (data_length) {
1217                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1218
1219                 crypto_hash_update(hash, &sg[i], cur_len);
1220
1221                 data_length -= cur_len;
1222                 page_off = 0;
1223                 i++;
1224         }
1225
1226         if (padding) {
1227                 struct scatterlist pad_sg;
1228
1229                 sg_init_one(&pad_sg, pad_bytes, padding);
1230                 crypto_hash_update(hash, &pad_sg, padding);
1231         }
1232         crypto_hash_final(hash, (u8 *) &data_crc);
1233
1234         return data_crc;
1235 }
1236
1237 static void iscsit_do_crypto_hash_buf(
1238         struct hash_desc *hash,
1239         unsigned char *buf,
1240         u32 payload_length,
1241         u32 padding,
1242         u8 *pad_bytes,
1243         u8 *data_crc)
1244 {
1245         struct scatterlist sg;
1246
1247         crypto_hash_init(hash);
1248
1249         sg_init_one(&sg, buf, payload_length);
1250         crypto_hash_update(hash, &sg, payload_length);
1251
1252         if (padding) {
1253                 sg_init_one(&sg, pad_bytes, padding);
1254                 crypto_hash_update(hash, &sg, padding);
1255         }
1256         crypto_hash_final(hash, data_crc);
1257 }
1258
1259 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1260 {
1261         int iov_ret, ooo_cmdsn = 0, ret;
1262         u8 data_crc_failed = 0;
1263         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1264         u32 rx_size = 0, payload_length;
1265         struct iscsi_cmd *cmd = NULL;
1266         struct se_cmd *se_cmd;
1267         struct iscsi_data *hdr;
1268         struct kvec *iov;
1269         unsigned long flags;
1270
1271         hdr                     = (struct iscsi_data *) buf;
1272         payload_length          = ntoh24(hdr->dlength);
1273         hdr->itt                = be32_to_cpu(hdr->itt);
1274         hdr->ttt                = be32_to_cpu(hdr->ttt);
1275         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1276         hdr->datasn             = be32_to_cpu(hdr->datasn);
1277         hdr->offset             = be32_to_cpu(hdr->offset);
1278
1279         if (!payload_length) {
1280                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1281                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1282                                         buf, conn);
1283         }
1284
1285         /* iSCSI write */
1286         spin_lock_bh(&conn->sess->session_stats_lock);
1287         conn->sess->rx_data_octets += payload_length;
1288         if (conn->sess->se_sess->se_node_acl) {
1289                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1290                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1291                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1292         }
1293         spin_unlock_bh(&conn->sess->session_stats_lock);
1294
1295         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1296                 pr_err("DataSegmentLength: %u is greater than"
1297                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1298                         conn->conn_ops->MaxRecvDataSegmentLength);
1299                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1300                                         buf, conn);
1301         }
1302
1303         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1304                         payload_length);
1305         if (!cmd)
1306                 return 0;
1307
1308         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1309                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1310                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1311                 payload_length, conn->cid);
1312
1313         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1314                 pr_err("Command ITT: 0x%08x received DataOUT after"
1315                         " last DataOUT received, dumping payload\n",
1316                         cmd->init_task_tag);
1317                 return iscsit_dump_data_payload(conn, payload_length, 1);
1318         }
1319
1320         if (cmd->data_direction != DMA_TO_DEVICE) {
1321                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1322                         " NON-WRITE command.\n", cmd->init_task_tag);
1323                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1324                                 1, 0, buf, cmd);
1325         }
1326         se_cmd = &cmd->se_cmd;
1327         iscsit_mod_dataout_timer(cmd);
1328
1329         if ((hdr->offset + payload_length) > cmd->se_cmd.data_length) {
1330                 pr_err("DataOut Offset: %u, Length %u greater than"
1331                         " iSCSI Command EDTL %u, protocol error.\n",
1332                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1333                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1334                                 1, 0, buf, cmd);
1335         }
1336
1337         if (cmd->unsolicited_data) {
1338                 int dump_unsolicited_data = 0;
1339
1340                 if (conn->sess->sess_ops->InitialR2T) {
1341                         pr_err("Received unexpected unsolicited data"
1342                                 " while InitialR2T=Yes, protocol error.\n");
1343                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1344                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1345                         return -1;
1346                 }
1347                 /*
1348                  * Special case for dealing with Unsolicited DataOUT
1349                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1350                  * failures;
1351                  */
1352
1353                 /* Something's amiss if we're not in WRITE_PENDING state... */
1354                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1355                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1356                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1357
1358                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1359                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1360                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1361                         dump_unsolicited_data = 1;
1362                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1363
1364                 if (dump_unsolicited_data) {
1365                         /*
1366                          * Check if a delayed TASK_ABORTED status needs to
1367                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1368                          * received with the unsolicitied data out.
1369                          */
1370                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371                                 iscsit_stop_dataout_timer(cmd);
1372
1373                         transport_check_aborted_status(se_cmd,
1374                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1375                         return iscsit_dump_data_payload(conn, payload_length, 1);
1376                 }
1377         } else {
1378                 /*
1379                  * For the normal solicited data path:
1380                  *
1381                  * Check for a delayed TASK_ABORTED status and dump any
1382                  * incoming data out payload if one exists.  Also, when the
1383                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1384                  * data out sequence, we decrement outstanding_r2ts.  Once
1385                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1386                  * TASK_ABORTED status.
1387                  */
1388                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1389                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1390                                 if (--cmd->outstanding_r2ts < 1) {
1391                                         iscsit_stop_dataout_timer(cmd);
1392                                         transport_check_aborted_status(
1393                                                         se_cmd, 1);
1394                                 }
1395
1396                         return iscsit_dump_data_payload(conn, payload_length, 1);
1397                 }
1398         }
1399         /*
1400          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1401          * within-command recovery checks before receiving the payload.
1402          */
1403         ret = iscsit_check_pre_dataout(cmd, buf);
1404         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1405                 return 0;
1406         else if (ret == DATAOUT_CANNOT_RECOVER)
1407                 return -1;
1408
1409         rx_size += payload_length;
1410         iov = &cmd->iov_data[0];
1411
1412         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1413         if (iov_ret < 0)
1414                 return -1;
1415
1416         iov_count += iov_ret;
1417
1418         padding = ((-payload_length) & 3);
1419         if (padding != 0) {
1420                 iov[iov_count].iov_base = cmd->pad_bytes;
1421                 iov[iov_count++].iov_len = padding;
1422                 rx_size += padding;
1423                 pr_debug("Receiving %u padding bytes.\n", padding);
1424         }
1425
1426         if (conn->conn_ops->DataDigest) {
1427                 iov[iov_count].iov_base = &checksum;
1428                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1429                 rx_size += ISCSI_CRC_LEN;
1430         }
1431
1432         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1433
1434         iscsit_unmap_iovec(cmd);
1435
1436         if (rx_got != rx_size)
1437                 return -1;
1438
1439         if (conn->conn_ops->DataDigest) {
1440                 u32 data_crc;
1441
1442                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1443                                                     hdr->offset, payload_length, padding,
1444                                                     cmd->pad_bytes);
1445
1446                 if (checksum != data_crc) {
1447                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1448                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1449                                 " does not match computed 0x%08x\n",
1450                                 hdr->itt, hdr->offset, payload_length,
1451                                 hdr->datasn, checksum, data_crc);
1452                         data_crc_failed = 1;
1453                 } else {
1454                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1455                                 " %u bytes of Data Out\n", checksum,
1456                                 payload_length);
1457                 }
1458         }
1459         /*
1460          * Increment post receive data and CRC values or perform
1461          * within-command recovery.
1462          */
1463         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1464         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1465                 return 0;
1466         else if (ret == DATAOUT_SEND_R2T) {
1467                 iscsit_set_dataout_sequence_values(cmd);
1468                 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1469         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1470                 /*
1471                  * Handle extra special case for out of order
1472                  * Unsolicited Data Out.
1473                  */
1474                 spin_lock_bh(&cmd->istate_lock);
1475                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1476                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1477                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1478                 spin_unlock_bh(&cmd->istate_lock);
1479
1480                 iscsit_stop_dataout_timer(cmd);
1481                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1482                                         &cmd->se_cmd) : 0;
1483         } else /* DATAOUT_CANNOT_RECOVER */
1484                 return -1;
1485
1486         return 0;
1487 }
1488
1489 static int iscsit_handle_nop_out(
1490         struct iscsi_conn *conn,
1491         unsigned char *buf)
1492 {
1493         unsigned char *ping_data = NULL;
1494         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1495         u32 checksum, data_crc, padding = 0, payload_length;
1496         struct iscsi_cmd *cmd = NULL;
1497         struct kvec *iov = NULL;
1498         struct iscsi_nopout *hdr;
1499
1500         hdr                     = (struct iscsi_nopout *) buf;
1501         payload_length          = ntoh24(hdr->dlength);
1502         hdr->itt                = be32_to_cpu(hdr->itt);
1503         hdr->ttt                = be32_to_cpu(hdr->ttt);
1504         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1505         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1506
1507         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1508                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1509                         " not set, protocol error.\n");
1510                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1511                                         buf, conn);
1512         }
1513
1514         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1515                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1516                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1517                         " error.\n", payload_length,
1518                         conn->conn_ops->MaxRecvDataSegmentLength);
1519                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1520                                         buf, conn);
1521         }
1522
1523         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1524                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1525                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1526                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1527                 payload_length);
1528         /*
1529          * This is not a response to a Unsolicited NopIN, which means
1530          * it can either be a NOPOUT ping request (with a valid ITT),
1531          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1532          * Either way, make sure we allocate an struct iscsi_cmd, as both
1533          * can contain ping data.
1534          */
1535         if (hdr->ttt == 0xFFFFFFFF) {
1536                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1537                 if (!cmd)
1538                         return iscsit_add_reject(
1539                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1540                                         1, buf, conn);
1541
1542                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1543                 cmd->i_state            = ISTATE_SEND_NOPIN;
1544                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1545                                                 1 : 0);
1546                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1547                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1548                 cmd->cmd_sn             = hdr->cmdsn;
1549                 cmd->exp_stat_sn        = hdr->exp_statsn;
1550                 cmd->data_direction     = DMA_NONE;
1551         }
1552
1553         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1554                 rx_size = payload_length;
1555                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1556                 if (!ping_data) {
1557                         pr_err("Unable to allocate memory for"
1558                                 " NOPOUT ping data.\n");
1559                         ret = -1;
1560                         goto out;
1561                 }
1562
1563                 iov = &cmd->iov_misc[0];
1564                 iov[niov].iov_base      = ping_data;
1565                 iov[niov++].iov_len     = payload_length;
1566
1567                 padding = ((-payload_length) & 3);
1568                 if (padding != 0) {
1569                         pr_debug("Receiving %u additional bytes"
1570                                 " for padding.\n", padding);
1571                         iov[niov].iov_base      = &cmd->pad_bytes;
1572                         iov[niov++].iov_len     = padding;
1573                         rx_size += padding;
1574                 }
1575                 if (conn->conn_ops->DataDigest) {
1576                         iov[niov].iov_base      = &checksum;
1577                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1578                         rx_size += ISCSI_CRC_LEN;
1579                 }
1580
1581                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1582                 if (rx_got != rx_size) {
1583                         ret = -1;
1584                         goto out;
1585                 }
1586
1587                 if (conn->conn_ops->DataDigest) {
1588                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1589                                         ping_data, payload_length,
1590                                         padding, cmd->pad_bytes,
1591                                         (u8 *)&data_crc);
1592
1593                         if (checksum != data_crc) {
1594                                 pr_err("Ping data CRC32C DataDigest"
1595                                 " 0x%08x does not match computed 0x%08x\n",
1596                                         checksum, data_crc);
1597                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1598                                         pr_err("Unable to recover from"
1599                                         " NOPOUT Ping DataCRC failure while in"
1600                                                 " ERL=0.\n");
1601                                         ret = -1;
1602                                         goto out;
1603                                 } else {
1604                                         /*
1605                                          * Silently drop this PDU and let the
1606                                          * initiator plug the CmdSN gap.
1607                                          */
1608                                         pr_debug("Dropping NOPOUT"
1609                                         " Command CmdSN: 0x%08x due to"
1610                                         " DataCRC error.\n", hdr->cmdsn);
1611                                         ret = 0;
1612                                         goto out;
1613                                 }
1614                         } else {
1615                                 pr_debug("Got CRC32C DataDigest"
1616                                 " 0x%08x for %u bytes of ping data.\n",
1617                                         checksum, payload_length);
1618                         }
1619                 }
1620
1621                 ping_data[payload_length] = '\0';
1622                 /*
1623                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1624                  */
1625                 cmd->buf_ptr = ping_data;
1626                 cmd->buf_ptr_size = payload_length;
1627
1628                 pr_debug("Got %u bytes of NOPOUT ping"
1629                         " data.\n", payload_length);
1630                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1631         }
1632
1633         if (hdr->itt != 0xFFFFFFFF) {
1634                 if (!cmd) {
1635                         pr_err("Checking CmdSN for NOPOUT,"
1636                                 " but cmd is NULL!\n");
1637                         return -1;
1638                 }
1639                 /*
1640                  * Initiator is expecting a NopIN ping reply,
1641                  */
1642                 spin_lock_bh(&conn->cmd_lock);
1643                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1644                 spin_unlock_bh(&conn->cmd_lock);
1645
1646                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1647
1648                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1649                         iscsit_add_cmd_to_response_queue(cmd, conn,
1650                                         cmd->i_state);
1651                         return 0;
1652                 }
1653
1654                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1655                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1656                         ret = 0;
1657                         goto ping_out;
1658                 }
1659                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1660                         return iscsit_add_reject_from_cmd(
1661                                         ISCSI_REASON_PROTOCOL_ERROR,
1662                                         1, 0, buf, cmd);
1663
1664                 return 0;
1665         }
1666
1667         if (hdr->ttt != 0xFFFFFFFF) {
1668                 /*
1669                  * This was a response to a unsolicited NOPIN ping.
1670                  */
1671                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1672                 if (!cmd)
1673                         return -1;
1674
1675                 iscsit_stop_nopin_response_timer(conn);
1676
1677                 cmd->i_state = ISTATE_REMOVE;
1678                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1679                 iscsit_start_nopin_timer(conn);
1680         } else {
1681                 /*
1682                  * Initiator is not expecting a NOPIN is response.
1683                  * Just ignore for now.
1684                  *
1685                  * iSCSI v19-91 10.18
1686                  * "A NOP-OUT may also be used to confirm a changed
1687                  *  ExpStatSN if another PDU will not be available
1688                  *  for a long time."
1689                  */
1690                 ret = 0;
1691                 goto out;
1692         }
1693
1694         return 0;
1695 out:
1696         if (cmd)
1697                 iscsit_release_cmd(cmd);
1698 ping_out:
1699         kfree(ping_data);
1700         return ret;
1701 }
1702
1703 static int iscsit_handle_task_mgt_cmd(
1704         struct iscsi_conn *conn,
1705         unsigned char *buf)
1706 {
1707         struct iscsi_cmd *cmd;
1708         struct se_tmr_req *se_tmr;
1709         struct iscsi_tmr_req *tmr_req;
1710         struct iscsi_tm *hdr;
1711         int out_of_order_cmdsn = 0;
1712         int ret;
1713         u8 function;
1714
1715         hdr                     = (struct iscsi_tm *) buf;
1716         hdr->itt                = be32_to_cpu(hdr->itt);
1717         hdr->rtt                = be32_to_cpu(hdr->rtt);
1718         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1719         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1720         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1721         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1722         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1723         function = hdr->flags;
1724
1725         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1726                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1727                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1728                 hdr->rtt, hdr->refcmdsn, conn->cid);
1729
1730         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1731             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1732              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1733                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1734                 hdr->rtt = ISCSI_RESERVED_TAG;
1735         }
1736
1737         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1738                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1739                 pr_err("Task Management Request TASK_REASSIGN not"
1740                         " issued as immediate command, bad iSCSI Initiator"
1741                                 "implementation\n");
1742                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1743                                         buf, conn);
1744         }
1745         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1746             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1747                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1748
1749         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1750         if (!cmd)
1751                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1752                                          1, buf, conn);
1753
1754         cmd->data_direction = DMA_NONE;
1755
1756         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1757         if (!cmd->tmr_req) {
1758                 pr_err("Unable to allocate memory for"
1759                         " Task Management command!\n");
1760                 return iscsit_add_reject_from_cmd(
1761                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1762                         1, 1, buf, cmd);
1763         }
1764
1765         /*
1766          * TASK_REASSIGN for ERL=2 / connection stays inside of
1767          * LIO-Target $FABRIC_MOD
1768          */
1769         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1770
1771                 u8 tcm_function;
1772                 int ret;
1773
1774                 transport_init_se_cmd(&cmd->se_cmd,
1775                                       &lio_target_fabric_configfs->tf_ops,
1776                                       conn->sess->se_sess, 0, DMA_NONE,
1777                                       MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
1778
1779                 switch (function) {
1780                 case ISCSI_TM_FUNC_ABORT_TASK:
1781                         tcm_function = TMR_ABORT_TASK;
1782                         break;
1783                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1784                         tcm_function = TMR_ABORT_TASK_SET;
1785                         break;
1786                 case ISCSI_TM_FUNC_CLEAR_ACA:
1787                         tcm_function = TMR_CLEAR_ACA;
1788                         break;
1789                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1790                         tcm_function = TMR_CLEAR_TASK_SET;
1791                         break;
1792                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1793                         tcm_function = TMR_LUN_RESET;
1794                         break;
1795                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1796                         tcm_function = TMR_TARGET_WARM_RESET;
1797                         break;
1798                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1799                         tcm_function = TMR_TARGET_COLD_RESET;
1800                         break;
1801                 default:
1802                         pr_err("Unknown iSCSI TMR Function:"
1803                                " 0x%02x\n", function);
1804                         return iscsit_add_reject_from_cmd(
1805                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1806                                 1, 1, buf, cmd);
1807                 }
1808
1809                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1810                                          tcm_function, GFP_KERNEL);
1811                 if (ret < 0)
1812                         return iscsit_add_reject_from_cmd(
1813                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1814                                 1, 1, buf, cmd);
1815
1816                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1817         }
1818
1819         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1820         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1821         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1822         cmd->init_task_tag      = hdr->itt;
1823         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1824         cmd->cmd_sn             = hdr->cmdsn;
1825         cmd->exp_stat_sn        = hdr->exp_statsn;
1826         se_tmr                  = cmd->se_cmd.se_tmr_req;
1827         tmr_req                 = cmd->tmr_req;
1828         /*
1829          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1830          */
1831         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1832                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1833                                                scsilun_to_int(&hdr->lun));
1834                 if (ret < 0) {
1835                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1836                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1837                         goto attach;
1838                 }
1839         }
1840
1841         switch (function) {
1842         case ISCSI_TM_FUNC_ABORT_TASK:
1843                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1844                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1845                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1846                         goto attach;
1847                 }
1848                 break;
1849         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1850         case ISCSI_TM_FUNC_CLEAR_ACA:
1851         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1852         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1853                 break;
1854         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1855                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1856                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1857                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1858                         goto attach;
1859                 }
1860                 break;
1861         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1862                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1863                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1864                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1865                         goto attach;
1866                 }
1867                 break;
1868         case ISCSI_TM_FUNC_TASK_REASSIGN:
1869                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1870                 /*
1871                  * Perform sanity checks on the ExpDataSN only if the
1872                  * TASK_REASSIGN was successful.
1873                  */
1874                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1875                         break;
1876
1877                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1878                         return iscsit_add_reject_from_cmd(
1879                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1880                                         buf, cmd);
1881                 break;
1882         default:
1883                 pr_err("Unknown TMR function: 0x%02x, protocol"
1884                         " error.\n", function);
1885                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1886                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1887                 goto attach;
1888         }
1889
1890         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1891             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1892                 se_tmr->call_transport = 1;
1893 attach:
1894         spin_lock_bh(&conn->cmd_lock);
1895         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1896         spin_unlock_bh(&conn->cmd_lock);
1897
1898         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1899                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1900                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1901                         out_of_order_cmdsn = 1;
1902                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1903                         return 0;
1904                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1905                         return iscsit_add_reject_from_cmd(
1906                                         ISCSI_REASON_PROTOCOL_ERROR,
1907                                         1, 0, buf, cmd);
1908         }
1909         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1910
1911         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1912                 return 0;
1913         /*
1914          * Found the referenced task, send to transport for processing.
1915          */
1916         if (se_tmr->call_transport)
1917                 return transport_generic_handle_tmr(&cmd->se_cmd);
1918
1919         /*
1920          * Could not find the referenced LUN, task, or Task Management
1921          * command not authorized or supported.  Change state and
1922          * let the tx_thread send the response.
1923          *
1924          * For connection recovery, this is also the default action for
1925          * TMR TASK_REASSIGN.
1926          */
1927         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1928         return 0;
1929 }
1930
1931 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1932 static int iscsit_handle_text_cmd(
1933         struct iscsi_conn *conn,
1934         unsigned char *buf)
1935 {
1936         char *text_ptr, *text_in;
1937         int cmdsn_ret, niov = 0, rx_got, rx_size;
1938         u32 checksum = 0, data_crc = 0, payload_length;
1939         u32 padding = 0, pad_bytes = 0, text_length = 0;
1940         struct iscsi_cmd *cmd;
1941         struct kvec iov[3];
1942         struct iscsi_text *hdr;
1943
1944         hdr                     = (struct iscsi_text *) buf;
1945         payload_length          = ntoh24(hdr->dlength);
1946         hdr->itt                = be32_to_cpu(hdr->itt);
1947         hdr->ttt                = be32_to_cpu(hdr->ttt);
1948         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1949         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1950
1951         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1952                 pr_err("Unable to accept text parameter length: %u"
1953                         "greater than MaxRecvDataSegmentLength %u.\n",
1954                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1955                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1956                                         buf, conn);
1957         }
1958
1959         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1960                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1961                 hdr->exp_statsn, payload_length);
1962
1963         rx_size = text_length = payload_length;
1964         if (text_length) {
1965                 text_in = kzalloc(text_length, GFP_KERNEL);
1966                 if (!text_in) {
1967                         pr_err("Unable to allocate memory for"
1968                                 " incoming text parameters\n");
1969                         return -1;
1970                 }
1971
1972                 memset(iov, 0, 3 * sizeof(struct kvec));
1973                 iov[niov].iov_base      = text_in;
1974                 iov[niov++].iov_len     = text_length;
1975
1976                 padding = ((-payload_length) & 3);
1977                 if (padding != 0) {
1978                         iov[niov].iov_base = &pad_bytes;
1979                         iov[niov++].iov_len  = padding;
1980                         rx_size += padding;
1981                         pr_debug("Receiving %u additional bytes"
1982                                         " for padding.\n", padding);
1983                 }
1984                 if (conn->conn_ops->DataDigest) {
1985                         iov[niov].iov_base      = &checksum;
1986                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1987                         rx_size += ISCSI_CRC_LEN;
1988                 }
1989
1990                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1991                 if (rx_got != rx_size) {
1992                         kfree(text_in);
1993                         return -1;
1994                 }
1995
1996                 if (conn->conn_ops->DataDigest) {
1997                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1998                                         text_in, text_length,
1999                                         padding, (u8 *)&pad_bytes,
2000                                         (u8 *)&data_crc);
2001
2002                         if (checksum != data_crc) {
2003                                 pr_err("Text data CRC32C DataDigest"
2004                                         " 0x%08x does not match computed"
2005                                         " 0x%08x\n", checksum, data_crc);
2006                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2007                                         pr_err("Unable to recover from"
2008                                         " Text Data digest failure while in"
2009                                                 " ERL=0.\n");
2010                                         kfree(text_in);
2011                                         return -1;
2012                                 } else {
2013                                         /*
2014                                          * Silently drop this PDU and let the
2015                                          * initiator plug the CmdSN gap.
2016                                          */
2017                                         pr_debug("Dropping Text"
2018                                         " Command CmdSN: 0x%08x due to"
2019                                         " DataCRC error.\n", hdr->cmdsn);
2020                                         kfree(text_in);
2021                                         return 0;
2022                                 }
2023                         } else {
2024                                 pr_debug("Got CRC32C DataDigest"
2025                                         " 0x%08x for %u bytes of text data.\n",
2026                                                 checksum, text_length);
2027                         }
2028                 }
2029                 text_in[text_length - 1] = '\0';
2030                 pr_debug("Successfully read %d bytes of text"
2031                                 " data.\n", text_length);
2032
2033                 if (strncmp("SendTargets", text_in, 11) != 0) {
2034                         pr_err("Received Text Data that is not"
2035                                 " SendTargets, cannot continue.\n");
2036                         kfree(text_in);
2037                         return -1;
2038                 }
2039                 text_ptr = strchr(text_in, '=');
2040                 if (!text_ptr) {
2041                         pr_err("No \"=\" separator found in Text Data,"
2042                                 "  cannot continue.\n");
2043                         kfree(text_in);
2044                         return -1;
2045                 }
2046                 if (strncmp("=All", text_ptr, 4) != 0) {
2047                         pr_err("Unable to locate All value for"
2048                                 " SendTargets key,  cannot continue.\n");
2049                         kfree(text_in);
2050                         return -1;
2051                 }
2052 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
2053                 kfree(text_in);
2054         }
2055
2056         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2057         if (!cmd)
2058                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2059                                         1, buf, conn);
2060
2061         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2062         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2063         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2064         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2065         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2066         cmd->cmd_sn             = hdr->cmdsn;
2067         cmd->exp_stat_sn        = hdr->exp_statsn;
2068         cmd->data_direction     = DMA_NONE;
2069
2070         spin_lock_bh(&conn->cmd_lock);
2071         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2072         spin_unlock_bh(&conn->cmd_lock);
2073
2074         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2075
2076         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2077                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2078                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2079                         return iscsit_add_reject_from_cmd(
2080                                         ISCSI_REASON_PROTOCOL_ERROR,
2081                                         1, 0, buf, cmd);
2082
2083                 return 0;
2084         }
2085
2086         return iscsit_execute_cmd(cmd, 0);
2087 }
2088
2089 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2090 {
2091         struct iscsi_conn *conn_p;
2092         struct iscsi_session *sess = conn->sess;
2093
2094         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2095                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2096
2097         atomic_set(&sess->session_logout, 1);
2098         atomic_set(&conn->conn_logout_remove, 1);
2099         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2100
2101         iscsit_inc_conn_usage_count(conn);
2102         iscsit_inc_session_usage_count(sess);
2103
2104         spin_lock_bh(&sess->conn_lock);
2105         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2106                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2107                         continue;
2108
2109                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2110                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2111         }
2112         spin_unlock_bh(&sess->conn_lock);
2113
2114         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2115
2116         return 0;
2117 }
2118
2119 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2120 {
2121         struct iscsi_conn *l_conn;
2122         struct iscsi_session *sess = conn->sess;
2123
2124         pr_debug("Received logout request CLOSECONNECTION for CID:"
2125                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2126
2127         /*
2128          * A Logout Request with a CLOSECONNECTION reason code for a CID
2129          * can arrive on a connection with a differing CID.
2130          */
2131         if (conn->cid == cmd->logout_cid) {
2132                 spin_lock_bh(&conn->state_lock);
2133                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2134                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2135
2136                 atomic_set(&conn->conn_logout_remove, 1);
2137                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2138                 iscsit_inc_conn_usage_count(conn);
2139
2140                 spin_unlock_bh(&conn->state_lock);
2141         } else {
2142                 /*
2143                  * Handle all different cid CLOSECONNECTION requests in
2144                  * iscsit_logout_post_handler_diffcid() as to give enough
2145                  * time for any non immediate command's CmdSN to be
2146                  * acknowledged on the connection in question.
2147                  *
2148                  * Here we simply make sure the CID is still around.
2149                  */
2150                 l_conn = iscsit_get_conn_from_cid(sess,
2151                                 cmd->logout_cid);
2152                 if (!l_conn) {
2153                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2154                         iscsit_add_cmd_to_response_queue(cmd, conn,
2155                                         cmd->i_state);
2156                         return 0;
2157                 }
2158
2159                 iscsit_dec_conn_usage_count(l_conn);
2160         }
2161
2162         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2163
2164         return 0;
2165 }
2166
2167 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2168 {
2169         struct iscsi_session *sess = conn->sess;
2170
2171         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2172                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2173
2174         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2175                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2176                         " while ERL!=2.\n");
2177                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2178                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2179                 return 0;
2180         }
2181
2182         if (conn->cid == cmd->logout_cid) {
2183                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2184                         " with CID: %hu on CID: %hu, implementation error.\n",
2185                                 cmd->logout_cid, conn->cid);
2186                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2187                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2188                 return 0;
2189         }
2190
2191         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2192
2193         return 0;
2194 }
2195
2196 static int iscsit_handle_logout_cmd(
2197         struct iscsi_conn *conn,
2198         unsigned char *buf)
2199 {
2200         int cmdsn_ret, logout_remove = 0;
2201         u8 reason_code = 0;
2202         struct iscsi_cmd *cmd;
2203         struct iscsi_logout *hdr;
2204         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2205
2206         hdr                     = (struct iscsi_logout *) buf;
2207         reason_code             = (hdr->flags & 0x7f);
2208         hdr->itt                = be32_to_cpu(hdr->itt);
2209         hdr->cid                = be16_to_cpu(hdr->cid);
2210         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2211         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2212
2213         if (tiqn) {
2214                 spin_lock(&tiqn->logout_stats.lock);
2215                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2216                         tiqn->logout_stats.normal_logouts++;
2217                 else
2218                         tiqn->logout_stats.abnormal_logouts++;
2219                 spin_unlock(&tiqn->logout_stats.lock);
2220         }
2221
2222         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2223                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2224                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2225                 hdr->cid, conn->cid);
2226
2227         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2228                 pr_err("Received logout request on connection that"
2229                         " is not in logged in state, ignoring request.\n");
2230                 return 0;
2231         }
2232
2233         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2234         if (!cmd)
2235                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2236                                         buf, conn);
2237
2238         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2239         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2240         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2241         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2242         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2243         cmd->cmd_sn             = hdr->cmdsn;
2244         cmd->exp_stat_sn        = hdr->exp_statsn;
2245         cmd->logout_cid         = hdr->cid;
2246         cmd->logout_reason      = reason_code;
2247         cmd->data_direction     = DMA_NONE;
2248
2249         /*
2250          * We need to sleep in these cases (by returning 1) until the Logout
2251          * Response gets sent in the tx thread.
2252          */
2253         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2254            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2255             (hdr->cid == conn->cid)))
2256                 logout_remove = 1;
2257
2258         spin_lock_bh(&conn->cmd_lock);
2259         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2260         spin_unlock_bh(&conn->cmd_lock);
2261
2262         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2263                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2264
2265         /*
2266          * Immediate commands are executed, well, immediately.
2267          * Non-Immediate Logout Commands are executed in CmdSN order.
2268          */
2269         if (cmd->immediate_cmd) {
2270                 int ret = iscsit_execute_cmd(cmd, 0);
2271
2272                 if (ret < 0)
2273                         return ret;
2274         } else {
2275                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2276                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2277                         logout_remove = 0;
2278                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2279                         return iscsit_add_reject_from_cmd(
2280                                 ISCSI_REASON_PROTOCOL_ERROR,
2281                                 1, 0, buf, cmd);
2282                 }
2283         }
2284
2285         return logout_remove;
2286 }
2287
2288 static int iscsit_handle_snack(
2289         struct iscsi_conn *conn,
2290         unsigned char *buf)
2291 {
2292         struct iscsi_snack *hdr;
2293
2294         hdr                     = (struct iscsi_snack *) buf;
2295         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2296         hdr->itt                = be32_to_cpu(hdr->itt);
2297         hdr->ttt                = be32_to_cpu(hdr->ttt);
2298         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2299         hdr->begrun             = be32_to_cpu(hdr->begrun);
2300         hdr->runlength          = be32_to_cpu(hdr->runlength);
2301
2302         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2303                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2304                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2305                         hdr->begrun, hdr->runlength, conn->cid);
2306
2307         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2308                 pr_err("Initiator sent SNACK request while in"
2309                         " ErrorRecoveryLevel=0.\n");
2310                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2311                                         buf, conn);
2312         }
2313         /*
2314          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2315          * call from inside iscsi_send_recovery_datain_or_r2t().
2316          */
2317         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2318         case 0:
2319                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2320                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2321         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2322                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2323                         hdr->begrun, hdr->runlength);
2324         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2325                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2326                         hdr->runlength);
2327         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2328                 /* FIXME: Support R-Data SNACK */
2329                 pr_err("R-Data SNACK Not Supported.\n");
2330                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2331                                         buf, conn);
2332         default:
2333                 pr_err("Unknown SNACK type 0x%02x, protocol"
2334                         " error.\n", hdr->flags & 0x0f);
2335                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2336                                         buf, conn);
2337         }
2338
2339         return 0;
2340 }
2341
2342 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2343 {
2344         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2345             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2346                 wait_for_completion_interruptible_timeout(
2347                                         &conn->rx_half_close_comp,
2348                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2349         }
2350 }
2351
2352 static int iscsit_handle_immediate_data(
2353         struct iscsi_cmd *cmd,
2354         unsigned char *buf,
2355         u32 length)
2356 {
2357         int iov_ret, rx_got = 0, rx_size = 0;
2358         u32 checksum, iov_count = 0, padding = 0;
2359         struct iscsi_conn *conn = cmd->conn;
2360         struct kvec *iov;
2361
2362         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2363         if (iov_ret < 0)
2364                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2365
2366         rx_size = length;
2367         iov_count = iov_ret;
2368         iov = &cmd->iov_data[0];
2369
2370         padding = ((-length) & 3);
2371         if (padding != 0) {
2372                 iov[iov_count].iov_base = cmd->pad_bytes;
2373                 iov[iov_count++].iov_len = padding;
2374                 rx_size += padding;
2375         }
2376
2377         if (conn->conn_ops->DataDigest) {
2378                 iov[iov_count].iov_base         = &checksum;
2379                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2380                 rx_size += ISCSI_CRC_LEN;
2381         }
2382
2383         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2384
2385         iscsit_unmap_iovec(cmd);
2386
2387         if (rx_got != rx_size) {
2388                 iscsit_rx_thread_wait_for_tcp(conn);
2389                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2390         }
2391
2392         if (conn->conn_ops->DataDigest) {
2393                 u32 data_crc;
2394
2395                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2396                                                     cmd->write_data_done, length, padding,
2397                                                     cmd->pad_bytes);
2398
2399                 if (checksum != data_crc) {
2400                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2401                                 " does not match computed 0x%08x\n", checksum,
2402                                 data_crc);
2403
2404                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2405                                 pr_err("Unable to recover from"
2406                                         " Immediate Data digest failure while"
2407                                         " in ERL=0.\n");
2408                                 iscsit_add_reject_from_cmd(
2409                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2410                                                 1, 0, buf, cmd);
2411                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2412                         } else {
2413                                 iscsit_add_reject_from_cmd(
2414                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2415                                                 0, 0, buf, cmd);
2416                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2417                         }
2418                 } else {
2419                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2420                                 " %u bytes of Immediate Data\n", checksum,
2421                                 length);
2422                 }
2423         }
2424
2425         cmd->write_data_done += length;
2426
2427         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2428                 spin_lock_bh(&cmd->istate_lock);
2429                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2430                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2431                 spin_unlock_bh(&cmd->istate_lock);
2432         }
2433
2434         return IMMEDIATE_DATA_NORMAL_OPERATION;
2435 }
2436
2437 /*
2438  *      Called with sess->conn_lock held.
2439  */
2440 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2441         with active network interface */
2442 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2443 {
2444         struct iscsi_cmd *cmd;
2445         struct iscsi_conn *conn_p;
2446
2447         /*
2448          * Only send a Asynchronous Message on connections whos network
2449          * interface is still functional.
2450          */
2451         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2452                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2453                         iscsit_inc_conn_usage_count(conn_p);
2454                         break;
2455                 }
2456         }
2457
2458         if (!conn_p)
2459                 return;
2460
2461         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2462         if (!cmd) {
2463                 iscsit_dec_conn_usage_count(conn_p);
2464                 return;
2465         }
2466
2467         cmd->logout_cid = conn->cid;
2468         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2469         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2470
2471         spin_lock_bh(&conn_p->cmd_lock);
2472         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2473         spin_unlock_bh(&conn_p->cmd_lock);
2474
2475         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2476         iscsit_dec_conn_usage_count(conn_p);
2477 }
2478
2479 static int iscsit_send_conn_drop_async_message(
2480         struct iscsi_cmd *cmd,
2481         struct iscsi_conn *conn)
2482 {
2483         struct iscsi_async *hdr;
2484
2485         cmd->tx_size = ISCSI_HDR_LEN;
2486         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2487
2488         hdr                     = (struct iscsi_async *) cmd->pdu;
2489         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2490         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2491         cmd->init_task_tag      = 0xFFFFFFFF;
2492         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2493         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2494         cmd->stat_sn            = conn->stat_sn++;
2495         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2496         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2497         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2498         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2499         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2500         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2501         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2502
2503         if (conn->conn_ops->HeaderDigest) {
2504                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2505
2506                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2507                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2508                                 0, NULL, (u8 *)header_digest);
2509
2510                 cmd->tx_size += ISCSI_CRC_LEN;
2511                 pr_debug("Attaching CRC32C HeaderDigest to"
2512                         " Async Message 0x%08x\n", *header_digest);
2513         }
2514
2515         cmd->iov_misc[0].iov_base       = cmd->pdu;
2516         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2517         cmd->iov_misc_count             = 1;
2518
2519         pr_debug("Sending Connection Dropped Async Message StatSN:"
2520                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2521                         cmd->logout_cid, conn->cid);
2522         return 0;
2523 }
2524
2525 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2526 {
2527         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2528             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2529                 wait_for_completion_interruptible_timeout(
2530                                         &conn->tx_half_close_comp,
2531                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2532         }
2533 }
2534
2535 static int iscsit_send_data_in(
2536         struct iscsi_cmd *cmd,
2537         struct iscsi_conn *conn)
2538 {
2539         int iov_ret = 0, set_statsn = 0;
2540         u32 iov_count = 0, tx_size = 0;
2541         struct iscsi_datain datain;
2542         struct iscsi_datain_req *dr;
2543         struct iscsi_data_rsp *hdr;
2544         struct kvec *iov;
2545         int eodr = 0;
2546         int ret;
2547
2548         memset(&datain, 0, sizeof(struct iscsi_datain));
2549         dr = iscsit_get_datain_values(cmd, &datain);
2550         if (!dr) {
2551                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2552                                 cmd->init_task_tag);
2553                 return -1;
2554         }
2555
2556         /*
2557          * Be paranoid and double check the logic for now.
2558          */
2559         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2560                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2561                         " datain.length: %u exceeds cmd->data_length: %u\n",
2562                         cmd->init_task_tag, datain.offset, datain.length,
2563                                 cmd->se_cmd.data_length);
2564                 return -1;
2565         }
2566
2567         spin_lock_bh(&conn->sess->session_stats_lock);
2568         conn->sess->tx_data_octets += datain.length;
2569         if (conn->sess->se_sess->se_node_acl) {
2570                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2571                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2572                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2573         }
2574         spin_unlock_bh(&conn->sess->session_stats_lock);
2575         /*
2576          * Special case for successfully execution w/ both DATAIN
2577          * and Sense Data.
2578          */
2579         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2580             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2581                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2582         else {
2583                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2584                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2585                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2586                         cmd->stat_sn = conn->stat_sn++;
2587                         set_statsn = 1;
2588                 } else if (dr->dr_complete ==
2589                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2590                         set_statsn = 1;
2591         }
2592
2593         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2594         memset(hdr, 0, ISCSI_HDR_LEN);
2595         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2596         hdr->flags              = datain.flags;
2597         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2598                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2599                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2600                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2601                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2602                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2603                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604                 }
2605         }
2606         hton24(hdr->dlength, datain.length);
2607         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2609                                 (struct scsi_lun *)&hdr->lun);
2610         else
2611                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2612
2613         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2614         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2615                                    cpu_to_be32(cmd->targ_xfer_tag) :
2616                                    0xFFFFFFFF;
2617         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2618                                                 0xFFFFFFFF;
2619         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2620         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2621         hdr->datasn             = cpu_to_be32(datain.data_sn);
2622         hdr->offset             = cpu_to_be32(datain.offset);
2623
2624         iov = &cmd->iov_data[0];
2625         iov[iov_count].iov_base = cmd->pdu;
2626         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2627         tx_size += ISCSI_HDR_LEN;
2628
2629         if (conn->conn_ops->HeaderDigest) {
2630                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2631
2632                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2633                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2634                                 0, NULL, (u8 *)header_digest);
2635
2636                 iov[0].iov_len += ISCSI_CRC_LEN;
2637                 tx_size += ISCSI_CRC_LEN;
2638
2639                 pr_debug("Attaching CRC32 HeaderDigest"
2640                         " for DataIN PDU 0x%08x\n", *header_digest);
2641         }
2642
2643         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2644         if (iov_ret < 0)
2645                 return -1;
2646
2647         iov_count += iov_ret;
2648         tx_size += datain.length;
2649
2650         cmd->padding = ((-datain.length) & 3);
2651         if (cmd->padding) {
2652                 iov[iov_count].iov_base         = cmd->pad_bytes;
2653                 iov[iov_count++].iov_len        = cmd->padding;
2654                 tx_size += cmd->padding;
2655
2656                 pr_debug("Attaching %u padding bytes\n",
2657                                 cmd->padding);
2658         }
2659         if (conn->conn_ops->DataDigest) {
2660                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2661                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2662
2663                 iov[iov_count].iov_base = &cmd->data_crc;
2664                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2665                 tx_size += ISCSI_CRC_LEN;
2666
2667                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2668                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2669         }
2670
2671         cmd->iov_data_count = iov_count;
2672         cmd->tx_size = tx_size;
2673
2674         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2675                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2676                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2677                 ntohl(hdr->offset), datain.length, conn->cid);
2678
2679         /* sendpage is preferred but can't insert markers */
2680         if (!conn->conn_ops->IFMarker)
2681                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2682         else
2683                 ret = iscsit_send_tx_data(cmd, conn, 0);
2684
2685         iscsit_unmap_iovec(cmd);
2686
2687         if (ret < 0) {
2688                 iscsit_tx_thread_wait_for_tcp(conn);
2689                 return ret;
2690         }
2691
2692         if (dr->dr_complete) {
2693                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2694                                 2 : 1;
2695                 iscsit_free_datain_req(cmd, dr);
2696         }
2697
2698         return eodr;
2699 }
2700
2701 static int iscsit_send_logout_response(
2702         struct iscsi_cmd *cmd,
2703         struct iscsi_conn *conn)
2704 {
2705         int niov = 0, tx_size;
2706         struct iscsi_conn *logout_conn = NULL;
2707         struct iscsi_conn_recovery *cr = NULL;
2708         struct iscsi_session *sess = conn->sess;
2709         struct kvec *iov;
2710         struct iscsi_logout_rsp *hdr;
2711         /*
2712          * The actual shutting down of Sessions and/or Connections
2713          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2714          * is done in scsi_logout_post_handler().
2715          */
2716         switch (cmd->logout_reason) {
2717         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2718                 pr_debug("iSCSI session logout successful, setting"
2719                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2720                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2721                 break;
2722         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2723                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2724                         break;
2725                 /*
2726                  * For CLOSECONNECTION logout requests carrying
2727                  * a matching logout CID -> local CID, the reference
2728                  * for the local CID will have been incremented in
2729                  * iscsi_logout_closeconnection().
2730                  *
2731                  * For CLOSECONNECTION logout requests carrying
2732                  * a different CID than the connection it arrived
2733                  * on, the connection responding to cmd->logout_cid
2734                  * is stopped in iscsit_logout_post_handler_diffcid().
2735                  */
2736
2737                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2738                         " successful.\n", cmd->logout_cid, conn->cid);
2739                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2740                 break;
2741         case ISCSI_LOGOUT_REASON_RECOVERY:
2742                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2743                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2744                         break;
2745                 /*
2746                  * If the connection is still active from our point of view
2747                  * force connection recovery to occur.
2748                  */
2749                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2750                                 cmd->logout_cid);
2751                 if ((logout_conn)) {
2752                         iscsit_connection_reinstatement_rcfr(logout_conn);
2753                         iscsit_dec_conn_usage_count(logout_conn);
2754                 }
2755
2756                 cr = iscsit_get_inactive_connection_recovery_entry(
2757                                 conn->sess, cmd->logout_cid);
2758                 if (!cr) {
2759                         pr_err("Unable to locate CID: %hu for"
2760                         " REMOVECONNFORRECOVERY Logout Request.\n",
2761                                 cmd->logout_cid);
2762                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2763                         break;
2764                 }
2765
2766                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2767
2768                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2769                         " for recovery for CID: %hu on CID: %hu successful.\n",
2770                                 cmd->logout_cid, conn->cid);
2771                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2772                 break;
2773         default:
2774                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2775                                 cmd->logout_reason);
2776                 return -1;
2777         }
2778
2779         tx_size = ISCSI_HDR_LEN;
2780         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2781         memset(hdr, 0, ISCSI_HDR_LEN);
2782         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2783         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2784         hdr->response           = cmd->logout_response;
2785         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2786         cmd->stat_sn            = conn->stat_sn++;
2787         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2788
2789         iscsit_increment_maxcmdsn(cmd, conn->sess);
2790         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2791         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2792
2793         iov = &cmd->iov_misc[0];
2794         iov[niov].iov_base      = cmd->pdu;
2795         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2796
2797         if (conn->conn_ops->HeaderDigest) {
2798                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2799
2800                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2801                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2802                                 0, NULL, (u8 *)header_digest);
2803
2804                 iov[0].iov_len += ISCSI_CRC_LEN;
2805                 tx_size += ISCSI_CRC_LEN;
2806                 pr_debug("Attaching CRC32C HeaderDigest to"
2807                         " Logout Response 0x%08x\n", *header_digest);
2808         }
2809         cmd->iov_misc_count = niov;
2810         cmd->tx_size = tx_size;
2811
2812         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2813                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2814                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2815                 cmd->logout_cid, conn->cid);
2816
2817         return 0;
2818 }
2819
2820 /*
2821  *      Unsolicited NOPIN, either requesting a response or not.
2822  */
2823 static int iscsit_send_unsolicited_nopin(
2824         struct iscsi_cmd *cmd,
2825         struct iscsi_conn *conn,
2826         int want_response)
2827 {
2828         int tx_size = ISCSI_HDR_LEN;
2829         struct iscsi_nopin *hdr;
2830         int ret;
2831
2832         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2833         memset(hdr, 0, ISCSI_HDR_LEN);
2834         hdr->opcode             = ISCSI_OP_NOOP_IN;
2835         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2836         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2837         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2838         cmd->stat_sn            = conn->stat_sn;
2839         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2840         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2841         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2842
2843         if (conn->conn_ops->HeaderDigest) {
2844                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2845
2846                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2847                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2848                                 0, NULL, (u8 *)header_digest);
2849
2850                 tx_size += ISCSI_CRC_LEN;
2851                 pr_debug("Attaching CRC32C HeaderDigest to"
2852                         " NopIN 0x%08x\n", *header_digest);
2853         }
2854
2855         cmd->iov_misc[0].iov_base       = cmd->pdu;
2856         cmd->iov_misc[0].iov_len        = tx_size;
2857         cmd->iov_misc_count     = 1;
2858         cmd->tx_size            = tx_size;
2859
2860         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2861                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2862
2863         ret = iscsit_send_tx_data(cmd, conn, 1);
2864         if (ret < 0) {
2865                 iscsit_tx_thread_wait_for_tcp(conn);
2866                 return ret;
2867         }
2868
2869         spin_lock_bh(&cmd->istate_lock);
2870         cmd->i_state = want_response ?
2871                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2872         spin_unlock_bh(&cmd->istate_lock);
2873
2874         return 0;
2875 }
2876
2877 static int iscsit_send_nopin_response(
2878         struct iscsi_cmd *cmd,
2879         struct iscsi_conn *conn)
2880 {
2881         int niov = 0, tx_size;
2882         u32 padding = 0;
2883         struct kvec *iov;
2884         struct iscsi_nopin *hdr;
2885
2886         tx_size = ISCSI_HDR_LEN;
2887         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2888         memset(hdr, 0, ISCSI_HDR_LEN);
2889         hdr->opcode             = ISCSI_OP_NOOP_IN;
2890         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2891         hton24(hdr->dlength, cmd->buf_ptr_size);
2892         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2893         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2894         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2895         cmd->stat_sn            = conn->stat_sn++;
2896         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2897
2898         iscsit_increment_maxcmdsn(cmd, conn->sess);
2899         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2900         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2901
2902         iov = &cmd->iov_misc[0];
2903         iov[niov].iov_base      = cmd->pdu;
2904         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2905
2906         if (conn->conn_ops->HeaderDigest) {
2907                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2908
2909                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2910                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2911                                 0, NULL, (u8 *)header_digest);
2912
2913                 iov[0].iov_len += ISCSI_CRC_LEN;
2914                 tx_size += ISCSI_CRC_LEN;
2915                 pr_debug("Attaching CRC32C HeaderDigest"
2916                         " to NopIn 0x%08x\n", *header_digest);
2917         }
2918
2919         /*
2920          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2921          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2922          */
2923         if (cmd->buf_ptr_size) {
2924                 iov[niov].iov_base      = cmd->buf_ptr;
2925                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2926                 tx_size += cmd->buf_ptr_size;
2927
2928                 pr_debug("Echoing back %u bytes of ping"
2929                         " data.\n", cmd->buf_ptr_size);
2930
2931                 padding = ((-cmd->buf_ptr_size) & 3);
2932                 if (padding != 0) {
2933                         iov[niov].iov_base = &cmd->pad_bytes;
2934                         iov[niov++].iov_len = padding;
2935                         tx_size += padding;
2936                         pr_debug("Attaching %u additional"
2937                                 " padding bytes.\n", padding);
2938                 }
2939                 if (conn->conn_ops->DataDigest) {
2940                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2941                                 cmd->buf_ptr, cmd->buf_ptr_size,
2942                                 padding, (u8 *)&cmd->pad_bytes,
2943                                 (u8 *)&cmd->data_crc);
2944
2945                         iov[niov].iov_base = &cmd->data_crc;
2946                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2947                         tx_size += ISCSI_CRC_LEN;
2948                         pr_debug("Attached DataDigest for %u"
2949                                 " bytes of ping data, CRC 0x%08x\n",
2950                                 cmd->buf_ptr_size, cmd->data_crc);
2951                 }
2952         }
2953
2954         cmd->iov_misc_count = niov;
2955         cmd->tx_size = tx_size;
2956
2957         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2958                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2959                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2960
2961         return 0;
2962 }
2963
2964 static int iscsit_send_r2t(
2965         struct iscsi_cmd *cmd,
2966         struct iscsi_conn *conn)
2967 {
2968         int tx_size = 0;
2969         struct iscsi_r2t *r2t;
2970         struct iscsi_r2t_rsp *hdr;
2971         int ret;
2972
2973         r2t = iscsit_get_r2t_from_list(cmd);
2974         if (!r2t)
2975                 return -1;
2976
2977         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2978         memset(hdr, 0, ISCSI_HDR_LEN);
2979         hdr->opcode             = ISCSI_OP_R2T;
2980         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2981         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2982                         (struct scsi_lun *)&hdr->lun);
2983         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2984         spin_lock_bh(&conn->sess->ttt_lock);
2985         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2986         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2987                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2988         spin_unlock_bh(&conn->sess->ttt_lock);
2989         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2990         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2991         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2992         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2993         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2994         hdr->data_offset        = cpu_to_be32(r2t->offset);
2995         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2996
2997         cmd->iov_misc[0].iov_base       = cmd->pdu;
2998         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2999         tx_size += ISCSI_HDR_LEN;
3000
3001         if (conn->conn_ops->HeaderDigest) {
3002                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3003
3004                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3005                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3006                                 0, NULL, (u8 *)header_digest);
3007
3008                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3009                 tx_size += ISCSI_CRC_LEN;
3010                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3011                         " PDU 0x%08x\n", *header_digest);
3012         }
3013
3014         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3015                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3016                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3017                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3018                         r2t->offset, r2t->xfer_len, conn->cid);
3019
3020         cmd->iov_misc_count = 1;
3021         cmd->tx_size = tx_size;
3022
3023         spin_lock_bh(&cmd->r2t_lock);
3024         r2t->sent_r2t = 1;
3025         spin_unlock_bh(&cmd->r2t_lock);
3026
3027         ret = iscsit_send_tx_data(cmd, conn, 1);
3028         if (ret < 0) {
3029                 iscsit_tx_thread_wait_for_tcp(conn);
3030                 return ret;
3031         }
3032
3033         spin_lock_bh(&cmd->dataout_timeout_lock);
3034         iscsit_start_dataout_timer(cmd, conn);
3035         spin_unlock_bh(&cmd->dataout_timeout_lock);
3036
3037         return 0;
3038 }
3039
3040 /*
3041  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3042  *              connection recovery.
3043  */
3044 int iscsit_build_r2ts_for_cmd(
3045         struct iscsi_cmd *cmd,
3046         struct iscsi_conn *conn,
3047         bool recovery)
3048 {
3049         int first_r2t = 1;
3050         u32 offset = 0, xfer_len = 0;
3051
3052         spin_lock_bh(&cmd->r2t_lock);
3053         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3054                 spin_unlock_bh(&cmd->r2t_lock);
3055                 return 0;
3056         }
3057
3058         if (conn->sess->sess_ops->DataSequenceInOrder &&
3059             !recovery)
3060                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3061
3062         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3063                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3064                         offset = cmd->r2t_offset;
3065
3066                         if (first_r2t && recovery) {
3067                                 int new_data_end = offset +
3068                                         conn->sess->sess_ops->MaxBurstLength -
3069                                         cmd->next_burst_len;
3070
3071                                 if (new_data_end > cmd->se_cmd.data_length)
3072                                         xfer_len = cmd->se_cmd.data_length - offset;
3073                                 else
3074                                         xfer_len =
3075                                                 conn->sess->sess_ops->MaxBurstLength -
3076                                                 cmd->next_burst_len;
3077                         } else {
3078                                 int new_data_end = offset +
3079                                         conn->sess->sess_ops->MaxBurstLength;
3080
3081                                 if (new_data_end > cmd->se_cmd.data_length)
3082                                         xfer_len = cmd->se_cmd.data_length - offset;
3083                                 else
3084                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3085                         }
3086                         cmd->r2t_offset += xfer_len;
3087
3088                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3089                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3090                 } else {
3091                         struct iscsi_seq *seq;
3092
3093                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3094                         if (!seq) {
3095                                 spin_unlock_bh(&cmd->r2t_lock);
3096                                 return -1;
3097                         }
3098
3099                         offset = seq->offset;
3100                         xfer_len = seq->xfer_len;
3101
3102                         if (cmd->seq_send_order == cmd->seq_count)
3103                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3104                 }
3105                 cmd->outstanding_r2ts++;
3106                 first_r2t = 0;
3107
3108                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3109                         spin_unlock_bh(&cmd->r2t_lock);
3110                         return -1;
3111                 }
3112
3113                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3114                         break;
3115         }
3116         spin_unlock_bh(&cmd->r2t_lock);
3117
3118         return 0;
3119 }
3120
3121 static int iscsit_send_status(
3122         struct iscsi_cmd *cmd,
3123         struct iscsi_conn *conn)
3124 {
3125         u8 iov_count = 0, recovery;
3126         u32 padding = 0, tx_size = 0;
3127         struct iscsi_scsi_rsp *hdr;
3128         struct kvec *iov;
3129
3130         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3131         if (!recovery)
3132                 cmd->stat_sn = conn->stat_sn++;
3133
3134         spin_lock_bh(&conn->sess->session_stats_lock);
3135         conn->sess->rsp_pdus++;
3136         spin_unlock_bh(&conn->sess->session_stats_lock);
3137
3138         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3139         memset(hdr, 0, ISCSI_HDR_LEN);
3140         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3141         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3142         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3143                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3144                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3145         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3146                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3147                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3148         }
3149         hdr->response           = cmd->iscsi_response;
3150         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3151         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3152         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3153
3154         iscsit_increment_maxcmdsn(cmd, conn->sess);
3155         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3156         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3157
3158         iov = &cmd->iov_misc[0];
3159         iov[iov_count].iov_base = cmd->pdu;
3160         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3161         tx_size += ISCSI_HDR_LEN;
3162
3163         /*
3164          * Attach SENSE DATA payload to iSCSI Response PDU
3165          */
3166         if (cmd->se_cmd.sense_buffer &&
3167            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3168             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3169                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3170                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3171                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3172                 iov[iov_count++].iov_len =
3173                                 (cmd->se_cmd.scsi_sense_length + padding);
3174                 tx_size += cmd->se_cmd.scsi_sense_length;
3175
3176                 if (padding) {
3177                         memset(cmd->se_cmd.sense_buffer +
3178                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3179                         tx_size += padding;
3180                         pr_debug("Adding %u bytes of padding to"
3181                                 " SENSE.\n", padding);
3182                 }
3183
3184                 if (conn->conn_ops->DataDigest) {
3185                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3186                                 cmd->se_cmd.sense_buffer,
3187                                 (cmd->se_cmd.scsi_sense_length + padding),
3188                                 0, NULL, (u8 *)&cmd->data_crc);
3189
3190                         iov[iov_count].iov_base    = &cmd->data_crc;
3191                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3192                         tx_size += ISCSI_CRC_LEN;
3193
3194                         pr_debug("Attaching CRC32 DataDigest for"
3195                                 " SENSE, %u bytes CRC 0x%08x\n",
3196                                 (cmd->se_cmd.scsi_sense_length + padding),
3197                                 cmd->data_crc);
3198                 }
3199
3200                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3201                                 " Response PDU\n",
3202                                 cmd->se_cmd.scsi_sense_length);
3203         }
3204
3205         if (conn->conn_ops->HeaderDigest) {
3206                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3207
3208                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3209                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3210                                 0, NULL, (u8 *)header_digest);
3211
3212                 iov[0].iov_len += ISCSI_CRC_LEN;
3213                 tx_size += ISCSI_CRC_LEN;
3214                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3215                                 " PDU 0x%08x\n", *header_digest);
3216         }
3217
3218         cmd->iov_misc_count = iov_count;
3219         cmd->tx_size = tx_size;
3220
3221         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3222                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3223                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3224                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3225
3226         return 0;
3227 }
3228
3229 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3230 {
3231         switch (se_tmr->response) {
3232         case TMR_FUNCTION_COMPLETE:
3233                 return ISCSI_TMF_RSP_COMPLETE;
3234         case TMR_TASK_DOES_NOT_EXIST:
3235                 return ISCSI_TMF_RSP_NO_TASK;
3236         case TMR_LUN_DOES_NOT_EXIST:
3237                 return ISCSI_TMF_RSP_NO_LUN;
3238         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3239                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3240         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3241                 return ISCSI_TMF_RSP_AUTH_FAILED;
3242         case TMR_FUNCTION_REJECTED:
3243         default:
3244                 return ISCSI_TMF_RSP_REJECTED;
3245         }
3246 }
3247
3248 static int iscsit_send_task_mgt_rsp(
3249         struct iscsi_cmd *cmd,
3250         struct iscsi_conn *conn)
3251 {
3252         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3253         struct iscsi_tm_rsp *hdr;
3254         u32 tx_size = 0;
3255
3256         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3257         memset(hdr, 0, ISCSI_HDR_LEN);
3258         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3259         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3260         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3261         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3262         cmd->stat_sn            = conn->stat_sn++;
3263         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3264
3265         iscsit_increment_maxcmdsn(cmd, conn->sess);
3266         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3267         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3268
3269         cmd->iov_misc[0].iov_base       = cmd->pdu;
3270         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3271         tx_size += ISCSI_HDR_LEN;
3272
3273         if (conn->conn_ops->HeaderDigest) {
3274                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3275
3276                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3277                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3278                                 0, NULL, (u8 *)header_digest);
3279
3280                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3281                 tx_size += ISCSI_CRC_LEN;
3282                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3283                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3284         }
3285
3286         cmd->iov_misc_count = 1;
3287         cmd->tx_size = tx_size;
3288
3289         pr_debug("Built Task Management Response ITT: 0x%08x,"
3290                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3291                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3292
3293         return 0;
3294 }
3295
3296 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3297 {
3298         bool ret = false;
3299
3300         if (np->np_sockaddr.ss_family == AF_INET6) {
3301                 const struct sockaddr_in6 sin6 = {
3302                         .sin6_addr = IN6ADDR_ANY_INIT };
3303                 struct sockaddr_in6 *sock_in6 =
3304                          (struct sockaddr_in6 *)&np->np_sockaddr;
3305
3306                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3307                                 sin6.sin6_addr.s6_addr, 16))
3308                         ret = true;
3309         } else {
3310                 struct sockaddr_in * sock_in =
3311                         (struct sockaddr_in *)&np->np_sockaddr;
3312
3313                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3314                         ret = true;
3315         }
3316
3317         return ret;
3318 }
3319
3320 #define SENDTARGETS_BUF_LIMIT 32768U
3321
3322 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3323 {
3324         char *payload = NULL;
3325         struct iscsi_conn *conn = cmd->conn;
3326         struct iscsi_portal_group *tpg;
3327         struct iscsi_tiqn *tiqn;
3328         struct iscsi_tpg_np *tpg_np;
3329         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3330         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3331
3332         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3333                          SENDTARGETS_BUF_LIMIT);
3334
3335         payload = kzalloc(buffer_len, GFP_KERNEL);
3336         if (!payload) {
3337                 pr_err("Unable to allocate memory for sendtargets"
3338                                 " response.\n");
3339                 return -ENOMEM;
3340         }
3341
3342         spin_lock(&tiqn_lock);
3343         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3344                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3345                 len += 1;
3346
3347                 if ((len + payload_len) > buffer_len) {
3348                         spin_unlock(&tiqn->tiqn_tpg_lock);
3349                         end_of_buf = 1;
3350                         goto eob;
3351                 }
3352                 memcpy(payload + payload_len, buf, len);
3353                 payload_len += len;
3354
3355                 spin_lock(&tiqn->tiqn_tpg_lock);
3356                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3357
3358                         spin_lock(&tpg->tpg_state_lock);
3359                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3360                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3361                                 spin_unlock(&tpg->tpg_state_lock);
3362                                 continue;
3363                         }
3364                         spin_unlock(&tpg->tpg_state_lock);
3365
3366                         spin_lock(&tpg->tpg_np_lock);
3367                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3368                                                 tpg_np_list) {
3369                                 struct iscsi_np *np = tpg_np->tpg_np;
3370                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3371
3372                                 len = sprintf(buf, "TargetAddress="
3373                                         "%s%s%s:%hu,%hu",
3374                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3375                                         "[" : "", (inaddr_any == false) ?
3376                                                 np->np_ip : conn->local_ip,
3377                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3378                                         "]" : "", (inaddr_any == false) ?
3379                                                 np->np_port : conn->local_port,
3380                                         tpg->tpgt);
3381                                 len += 1;
3382
3383                                 if ((len + payload_len) > buffer_len) {
3384                                         spin_unlock(&tpg->tpg_np_lock);
3385                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3386                                         end_of_buf = 1;
3387                                         goto eob;
3388                                 }
3389                                 memcpy(payload + payload_len, buf, len);
3390                                 payload_len += len;
3391                         }
3392                         spin_unlock(&tpg->tpg_np_lock);
3393                 }
3394                 spin_unlock(&tiqn->tiqn_tpg_lock);
3395 eob:
3396                 if (end_of_buf)
3397                         break;
3398         }
3399         spin_unlock(&tiqn_lock);
3400
3401         cmd->buf_ptr = payload;
3402
3403         return payload_len;
3404 }
3405
3406 /*
3407  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3408  *      MaxRecvDataSegmentLength.
3409  */
3410 static int iscsit_send_text_rsp(
3411         struct iscsi_cmd *cmd,
3412         struct iscsi_conn *conn)
3413 {
3414         struct iscsi_text_rsp *hdr;
3415         struct kvec *iov;
3416         u32 padding = 0, tx_size = 0;
3417         int text_length, iov_count = 0;
3418
3419         text_length = iscsit_build_sendtargets_response(cmd);
3420         if (text_length < 0)
3421                 return text_length;
3422
3423         padding = ((-text_length) & 3);
3424         if (padding != 0) {
3425                 memset(cmd->buf_ptr + text_length, 0, padding);
3426                 pr_debug("Attaching %u additional bytes for"
3427                         " padding.\n", padding);
3428         }
3429
3430         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3431         memset(hdr, 0, ISCSI_HDR_LEN);
3432         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3433         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3434         hton24(hdr->dlength, text_length);
3435         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3436         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3437         cmd->stat_sn            = conn->stat_sn++;
3438         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3439
3440         iscsit_increment_maxcmdsn(cmd, conn->sess);
3441         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3442         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3443
3444         iov = &cmd->iov_misc[0];
3445
3446         iov[iov_count].iov_base = cmd->pdu;
3447         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3448         iov[iov_count].iov_base = cmd->buf_ptr;
3449         iov[iov_count++].iov_len = text_length + padding;
3450
3451         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3452
3453         if (conn->conn_ops->HeaderDigest) {
3454                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3455
3456                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3457                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3458                                 0, NULL, (u8 *)header_digest);
3459
3460                 iov[0].iov_len += ISCSI_CRC_LEN;
3461                 tx_size += ISCSI_CRC_LEN;
3462                 pr_debug("Attaching CRC32 HeaderDigest for"
3463                         " Text Response PDU 0x%08x\n", *header_digest);
3464         }
3465
3466         if (conn->conn_ops->DataDigest) {
3467                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3468                                 cmd->buf_ptr, (text_length + padding),
3469                                 0, NULL, (u8 *)&cmd->data_crc);
3470
3471                 iov[iov_count].iov_base = &cmd->data_crc;
3472                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3473                 tx_size += ISCSI_CRC_LEN;
3474
3475                 pr_debug("Attaching DataDigest for %u bytes of text"
3476                         " data, CRC 0x%08x\n", (text_length + padding),
3477                         cmd->data_crc);
3478         }
3479
3480         cmd->iov_misc_count = iov_count;
3481         cmd->tx_size = tx_size;
3482
3483         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3484                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3485                         text_length, conn->cid);
3486         return 0;
3487 }
3488
3489 static int iscsit_send_reject(
3490         struct iscsi_cmd *cmd,
3491         struct iscsi_conn *conn)
3492 {
3493         u32 iov_count = 0, tx_size = 0;
3494         struct iscsi_reject *hdr;
3495         struct kvec *iov;
3496
3497         hdr                     = (struct iscsi_reject *) cmd->pdu;
3498         hdr->opcode             = ISCSI_OP_REJECT;
3499         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3500         hton24(hdr->dlength, ISCSI_HDR_LEN);
3501         cmd->stat_sn            = conn->stat_sn++;
3502         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3503         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3504         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3505
3506         iov = &cmd->iov_misc[0];
3507
3508         iov[iov_count].iov_base = cmd->pdu;
3509         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3510         iov[iov_count].iov_base = cmd->buf_ptr;
3511         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3512
3513         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3514
3515         if (conn->conn_ops->HeaderDigest) {
3516                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3517
3518                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3519                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3520                                 0, NULL, (u8 *)header_digest);
3521
3522                 iov[0].iov_len += ISCSI_CRC_LEN;
3523                 tx_size += ISCSI_CRC_LEN;
3524                 pr_debug("Attaching CRC32 HeaderDigest for"
3525                         " REJECT PDU 0x%08x\n", *header_digest);
3526         }
3527
3528         if (conn->conn_ops->DataDigest) {
3529                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3530                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3531                                 0, NULL, (u8 *)&cmd->data_crc);
3532
3533                 iov[iov_count].iov_base = &cmd->data_crc;
3534                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3535                 tx_size += ISCSI_CRC_LEN;
3536                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3537                                 " PDU 0x%08x\n", cmd->data_crc);
3538         }
3539
3540         cmd->iov_misc_count = iov_count;
3541         cmd->tx_size = tx_size;
3542
3543         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3544                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3545
3546         return 0;
3547 }
3548
3549 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3550 {
3551         struct iscsi_thread_set *ts = conn->thread_set;
3552         int ord, cpu;
3553         /*
3554          * thread_id is assigned from iscsit_global->ts_bitmap from
3555          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3556          *
3557          * Here we use thread_id to determine which CPU that this
3558          * iSCSI connection's iscsi_thread_set will be scheduled to
3559          * execute upon.
3560          */
3561         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3562         for_each_online_cpu(cpu) {
3563                 if (ord-- == 0) {
3564                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3565                         return;
3566                 }
3567         }
3568         /*
3569          * This should never be reached..
3570          */
3571         dump_stack();
3572         cpumask_setall(conn->conn_cpumask);
3573 }
3574
3575 static inline void iscsit_thread_check_cpumask(
3576         struct iscsi_conn *conn,
3577         struct task_struct *p,
3578         int mode)
3579 {
3580         char buf[128];
3581         /*
3582          * mode == 1 signals iscsi_target_tx_thread() usage.
3583          * mode == 0 signals iscsi_target_rx_thread() usage.
3584          */
3585         if (mode == 1) {
3586                 if (!conn->conn_tx_reset_cpumask)
3587                         return;
3588                 conn->conn_tx_reset_cpumask = 0;
3589         } else {
3590                 if (!conn->conn_rx_reset_cpumask)
3591                         return;
3592                 conn->conn_rx_reset_cpumask = 0;
3593         }
3594         /*
3595          * Update the CPU mask for this single kthread so that
3596          * both TX and RX kthreads are scheduled to run on the
3597          * same CPU.
3598          */
3599         memset(buf, 0, 128);
3600         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3601         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3602 }
3603
3604 static int handle_immediate_queue(struct iscsi_conn *conn)
3605 {
3606         struct iscsi_queue_req *qr;
3607         struct iscsi_cmd *cmd;
3608         u8 state;
3609         int ret;
3610
3611         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3612                 atomic_set(&conn->check_immediate_queue, 0);
3613                 cmd = qr->cmd;
3614                 state = qr->state;
3615                 kmem_cache_free(lio_qr_cache, qr);
3616
3617                 switch (state) {
3618                 case ISTATE_SEND_R2T:
3619                         ret = iscsit_send_r2t(cmd, conn);
3620                         if (ret < 0)
3621                                 goto err;
3622                         break;
3623                 case ISTATE_REMOVE:
3624                         if (cmd->data_direction == DMA_TO_DEVICE)
3625                                 iscsit_stop_dataout_timer(cmd);
3626
3627                         spin_lock_bh(&conn->cmd_lock);
3628                         list_del(&cmd->i_conn_node);
3629                         spin_unlock_bh(&conn->cmd_lock);
3630
3631                         iscsit_free_cmd(cmd);
3632                         continue;
3633                 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3634                         iscsit_mod_nopin_response_timer(conn);
3635                         ret = iscsit_send_unsolicited_nopin(cmd,
3636                                                             conn, 1);
3637                         if (ret < 0)
3638                                 goto err;
3639                         break;
3640                 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3641                         ret = iscsit_send_unsolicited_nopin(cmd,
3642                                                             conn, 0);
3643                         if (ret < 0)
3644                                 goto err;
3645                         break;
3646                 default:
3647                         pr_err("Unknown Opcode: 0x%02x ITT:"
3648                                " 0x%08x, i_state: %d on CID: %hu\n",
3649                                cmd->iscsi_opcode, cmd->init_task_tag, state,
3650                                conn->cid);
3651                         goto err;
3652                 }
3653         }
3654
3655         return 0;
3656
3657 err:
3658         return -1;
3659 }
3660
3661 static int handle_response_queue(struct iscsi_conn *conn)
3662 {
3663         struct iscsi_queue_req *qr;
3664         struct iscsi_cmd *cmd;
3665         u8 state;
3666         int ret;
3667
3668         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3669                 cmd = qr->cmd;
3670                 state = qr->state;
3671                 kmem_cache_free(lio_qr_cache, qr);
3672
3673 check_rsp_state:
3674                 switch (state) {
3675                 case ISTATE_SEND_DATAIN:
3676                         ret = iscsit_send_data_in(cmd, conn);
3677                         if (ret < 0)
3678                                 goto err;
3679                         else if (!ret)
3680                                 /* more drs */
3681                                 goto check_rsp_state;
3682                         else if (ret == 1) {
3683                                 /* all done */
3684                                 spin_lock_bh(&cmd->istate_lock);
3685                                 cmd->i_state = ISTATE_SENT_STATUS;
3686                                 spin_unlock_bh(&cmd->istate_lock);
3687                                 continue;
3688                         } else if (ret == 2) {
3689                                 /* Still must send status,
3690                                    SCF_TRANSPORT_TASK_SENSE was set */
3691                                 spin_lock_bh(&cmd->istate_lock);
3692                                 cmd->i_state = ISTATE_SEND_STATUS;
3693                                 spin_unlock_bh(&cmd->istate_lock);
3694                                 state = ISTATE_SEND_STATUS;
3695                                 goto check_rsp_state;
3696                         }
3697
3698                         break;
3699                 case ISTATE_SEND_STATUS:
3700                 case ISTATE_SEND_STATUS_RECOVERY:
3701                         ret = iscsit_send_status(cmd, conn);
3702                         break;
3703                 case ISTATE_SEND_LOGOUTRSP:
3704                         ret = iscsit_send_logout_response(cmd, conn);
3705                         break;
3706                 case ISTATE_SEND_ASYNCMSG:
3707                         ret = iscsit_send_conn_drop_async_message(
3708                                 cmd, conn);
3709                         break;
3710                 case ISTATE_SEND_NOPIN:
3711                         ret = iscsit_send_nopin_response(cmd, conn);
3712                         break;
3713                 case ISTATE_SEND_REJECT:
3714                         ret = iscsit_send_reject(cmd, conn);
3715                         break;
3716                 case ISTATE_SEND_TASKMGTRSP:
3717                         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3718                         if (ret != 0)
3719                                 break;
3720                         ret = iscsit_tmr_post_handler(cmd, conn);
3721                         if (ret != 0)
3722                                 iscsit_fall_back_to_erl0(conn->sess);
3723                         break;
3724                 case ISTATE_SEND_TEXTRSP:
3725                         ret = iscsit_send_text_rsp(cmd, conn);
3726                         break;
3727                 default:
3728                         pr_err("Unknown Opcode: 0x%02x ITT:"
3729                                " 0x%08x, i_state: %d on CID: %hu\n",
3730                                cmd->iscsi_opcode, cmd->init_task_tag,
3731                                state, conn->cid);
3732                         goto err;
3733                 }
3734                 if (ret < 0)
3735                         goto err;
3736
3737                 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3738                         iscsit_tx_thread_wait_for_tcp(conn);
3739                         iscsit_unmap_iovec(cmd);
3740                         goto err;
3741                 }
3742                 iscsit_unmap_iovec(cmd);
3743
3744                 switch (state) {
3745                 case ISTATE_SEND_LOGOUTRSP:
3746                         if (!iscsit_logout_post_handler(cmd, conn))
3747                                 goto restart;
3748                         /* fall through */
3749                 case ISTATE_SEND_STATUS:
3750                 case ISTATE_SEND_ASYNCMSG:
3751                 case ISTATE_SEND_NOPIN:
3752                 case ISTATE_SEND_STATUS_RECOVERY:
3753                 case ISTATE_SEND_TEXTRSP:
3754                 case ISTATE_SEND_TASKMGTRSP:
3755                         spin_lock_bh(&cmd->istate_lock);
3756                         cmd->i_state = ISTATE_SENT_STATUS;
3757                         spin_unlock_bh(&cmd->istate_lock);
3758                         break;
3759                 case ISTATE_SEND_REJECT:
3760                         if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3761                                 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3762                                 complete(&cmd->reject_comp);
3763                                 goto err;
3764                         }
3765                         complete(&cmd->reject_comp);
3766                         break;
3767                 default:
3768                         pr_err("Unknown Opcode: 0x%02x ITT:"
3769                                " 0x%08x, i_state: %d on CID: %hu\n",
3770                                cmd->iscsi_opcode, cmd->init_task_tag,
3771                                cmd->i_state, conn->cid);
3772                         goto err;
3773                 }
3774
3775                 if (atomic_read(&conn->check_immediate_queue))
3776                         break;
3777         }
3778
3779         return 0;
3780
3781 err:
3782         return -1;
3783 restart:
3784         return -EAGAIN;
3785 }
3786
3787 int iscsi_target_tx_thread(void *arg)
3788 {
3789         int ret = 0;
3790         struct iscsi_conn *conn;
3791         struct iscsi_thread_set *ts = arg;
3792         /*
3793          * Allow ourselves to be interrupted by SIGINT so that a
3794          * connection recovery / failure event can be triggered externally.
3795          */
3796         allow_signal(SIGINT);
3797
3798 restart:
3799         conn = iscsi_tx_thread_pre_handler(ts);
3800         if (!conn)
3801                 goto out;
3802
3803         ret = 0;
3804
3805         while (!kthread_should_stop()) {
3806                 /*
3807                  * Ensure that both TX and RX per connection kthreads
3808                  * are scheduled to run on the same CPU.
3809                  */
3810                 iscsit_thread_check_cpumask(conn, current, 1);
3811
3812                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3813
3814                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3815                      signal_pending(current))
3816                         goto transport_err;
3817
3818                 ret = handle_immediate_queue(conn);
3819                 if (ret < 0)
3820                         goto transport_err;
3821
3822                 ret = handle_response_queue(conn);
3823                 if (ret == -EAGAIN)
3824                         goto restart;
3825                 else if (ret < 0)
3826                         goto transport_err;
3827         }
3828
3829 transport_err:
3830         iscsit_take_action_for_connection_exit(conn);
3831         goto restart;
3832 out:
3833         return 0;
3834 }
3835
3836 int iscsi_target_rx_thread(void *arg)
3837 {
3838         int ret;
3839         u8 buffer[ISCSI_HDR_LEN], opcode;
3840         u32 checksum = 0, digest = 0;
3841         struct iscsi_conn *conn = NULL;
3842         struct iscsi_thread_set *ts = arg;
3843         struct kvec iov;
3844         /*
3845          * Allow ourselves to be interrupted by SIGINT so that a
3846          * connection recovery / failure event can be triggered externally.
3847          */
3848         allow_signal(SIGINT);
3849
3850 restart:
3851         conn = iscsi_rx_thread_pre_handler(ts);
3852         if (!conn)
3853                 goto out;
3854
3855         while (!kthread_should_stop()) {
3856                 /*
3857                  * Ensure that both TX and RX per connection kthreads
3858                  * are scheduled to run on the same CPU.
3859                  */
3860                 iscsit_thread_check_cpumask(conn, current, 0);
3861
3862                 memset(buffer, 0, ISCSI_HDR_LEN);
3863                 memset(&iov, 0, sizeof(struct kvec));
3864
3865                 iov.iov_base    = buffer;
3866                 iov.iov_len     = ISCSI_HDR_LEN;
3867
3868                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3869                 if (ret != ISCSI_HDR_LEN) {
3870                         iscsit_rx_thread_wait_for_tcp(conn);
3871                         goto transport_err;
3872                 }
3873
3874                 /*
3875                  * Set conn->bad_hdr for use with REJECT PDUs.
3876                  */
3877                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3878
3879                 if (conn->conn_ops->HeaderDigest) {
3880                         iov.iov_base    = &digest;
3881                         iov.iov_len     = ISCSI_CRC_LEN;
3882
3883                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3884                         if (ret != ISCSI_CRC_LEN) {
3885                                 iscsit_rx_thread_wait_for_tcp(conn);
3886                                 goto transport_err;
3887                         }
3888
3889                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3890                                         buffer, ISCSI_HDR_LEN,
3891                                         0, NULL, (u8 *)&checksum);
3892
3893                         if (digest != checksum) {
3894                                 pr_err("HeaderDigest CRC32C failed,"
3895                                         " received 0x%08x, computed 0x%08x\n",
3896                                         digest, checksum);
3897                                 /*
3898                                  * Set the PDU to 0xff so it will intentionally
3899                                  * hit default in the switch below.
3900                                  */
3901                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3902                                 spin_lock_bh(&conn->sess->session_stats_lock);
3903                                 conn->sess->conn_digest_errors++;
3904                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3905                         } else {
3906                                 pr_debug("Got HeaderDigest CRC32C"
3907                                                 " 0x%08x\n", checksum);
3908                         }
3909                 }
3910
3911                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3912                         goto transport_err;
3913
3914                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3915
3916                 if (conn->sess->sess_ops->SessionType &&
3917                    ((!(opcode & ISCSI_OP_TEXT)) ||
3918                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3919                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3920                         " while in Discovery Session, rejecting.\n", opcode);
3921                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3922                                         buffer, conn);
3923                         goto transport_err;
3924                 }
3925
3926                 switch (opcode) {
3927                 case ISCSI_OP_SCSI_CMD:
3928                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3929                                 goto transport_err;
3930                         break;
3931                 case ISCSI_OP_SCSI_DATA_OUT:
3932                         if (iscsit_handle_data_out(conn, buffer) < 0)
3933                                 goto transport_err;
3934                         break;
3935                 case ISCSI_OP_NOOP_OUT:
3936                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3937                                 goto transport_err;
3938                         break;
3939                 case ISCSI_OP_SCSI_TMFUNC:
3940                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3941                                 goto transport_err;
3942                         break;
3943                 case ISCSI_OP_TEXT:
3944                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3945                                 goto transport_err;
3946                         break;
3947                 case ISCSI_OP_LOGOUT:
3948                         ret = iscsit_handle_logout_cmd(conn, buffer);
3949                         if (ret > 0) {
3950                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3951                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3952                                 goto transport_err;
3953                         } else if (ret < 0)
3954                                 goto transport_err;
3955                         break;
3956                 case ISCSI_OP_SNACK:
3957                         if (iscsit_handle_snack(conn, buffer) < 0)
3958                                 goto transport_err;
3959                         break;
3960                 default:
3961                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3962                                         opcode);
3963                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3964                                 pr_err("Cannot recover from unknown"
3965                                 " opcode while ERL=0, closing iSCSI connection"
3966                                 ".\n");
3967                                 goto transport_err;
3968                         }
3969                         if (!conn->conn_ops->OFMarker) {
3970                                 pr_err("Unable to recover from unknown"
3971                                 " opcode while OFMarker=No, closing iSCSI"
3972                                         " connection.\n");
3973                                 goto transport_err;
3974                         }
3975                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3976                                 pr_err("Unable to recover from unknown"
3977                                         " opcode, closing iSCSI connection.\n");
3978                                 goto transport_err;
3979                         }
3980                         break;
3981                 }
3982         }
3983
3984 transport_err:
3985         if (!signal_pending(current))
3986                 atomic_set(&conn->transport_failed, 1);
3987         iscsit_take_action_for_connection_exit(conn);
3988         goto restart;
3989 out:
3990         return 0;
3991 }
3992
3993 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3994 {
3995         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3996         struct iscsi_session *sess = conn->sess;
3997         /*
3998          * We expect this function to only ever be called from either RX or TX
3999          * thread context via iscsit_close_connection() once the other context
4000          * has been reset -> returned sleeping pre-handler state.
4001          */
4002         spin_lock_bh(&conn->cmd_lock);
4003         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4004
4005                 list_del(&cmd->i_conn_node);
4006                 spin_unlock_bh(&conn->cmd_lock);
4007
4008                 iscsit_increment_maxcmdsn(cmd, sess);
4009
4010                 iscsit_free_cmd(cmd);
4011
4012                 spin_lock_bh(&conn->cmd_lock);
4013         }
4014         spin_unlock_bh(&conn->cmd_lock);
4015 }
4016
4017 static void iscsit_stop_timers_for_cmds(
4018         struct iscsi_conn *conn)
4019 {
4020         struct iscsi_cmd *cmd;
4021
4022         spin_lock_bh(&conn->cmd_lock);
4023         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4024                 if (cmd->data_direction == DMA_TO_DEVICE)
4025                         iscsit_stop_dataout_timer(cmd);
4026         }
4027         spin_unlock_bh(&conn->cmd_lock);
4028 }
4029
4030 int iscsit_close_connection(
4031         struct iscsi_conn *conn)
4032 {
4033         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4034         struct iscsi_session    *sess = conn->sess;
4035
4036         pr_debug("Closing iSCSI connection CID %hu on SID:"
4037                 " %u\n", conn->cid, sess->sid);
4038         /*
4039          * Always up conn_logout_comp just in case the RX Thread is sleeping
4040          * and the logout response never got sent because the connection
4041          * failed.
4042          */
4043         complete(&conn->conn_logout_comp);
4044
4045         iscsi_release_thread_set(conn);
4046
4047         iscsit_stop_timers_for_cmds(conn);
4048         iscsit_stop_nopin_response_timer(conn);
4049         iscsit_stop_nopin_timer(conn);
4050         iscsit_free_queue_reqs_for_conn(conn);
4051
4052         /*
4053          * During Connection recovery drop unacknowledged out of order
4054          * commands for this connection, and prepare the other commands
4055          * for realligence.
4056          *
4057          * During normal operation clear the out of order commands (but
4058          * do not free the struct iscsi_ooo_cmdsn's) and release all
4059          * struct iscsi_cmds.
4060          */
4061         if (atomic_read(&conn->connection_recovery)) {
4062                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4063                 iscsit_prepare_cmds_for_realligance(conn);
4064         } else {
4065                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4066                 iscsit_release_commands_from_conn(conn);
4067         }
4068
4069         /*
4070          * Handle decrementing session or connection usage count if
4071          * a logout response was not able to be sent because the
4072          * connection failed.  Fall back to Session Recovery here.
4073          */
4074         if (atomic_read(&conn->conn_logout_remove)) {
4075                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4076                         iscsit_dec_conn_usage_count(conn);
4077                         iscsit_dec_session_usage_count(sess);
4078                 }
4079                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4080                         iscsit_dec_conn_usage_count(conn);
4081
4082                 atomic_set(&conn->conn_logout_remove, 0);
4083                 atomic_set(&sess->session_reinstatement, 0);
4084                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4085         }
4086
4087         spin_lock_bh(&sess->conn_lock);
4088         list_del(&conn->conn_list);
4089
4090         /*
4091          * Attempt to let the Initiator know this connection failed by
4092          * sending an Connection Dropped Async Message on another
4093          * active connection.
4094          */
4095         if (atomic_read(&conn->connection_recovery))
4096                 iscsit_build_conn_drop_async_message(conn);
4097
4098         spin_unlock_bh(&sess->conn_lock);
4099
4100         /*
4101          * If connection reinstatement is being performed on this connection,
4102          * up the connection reinstatement semaphore that is being blocked on
4103          * in iscsit_cause_connection_reinstatement().
4104          */
4105         spin_lock_bh(&conn->state_lock);
4106         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4107                 spin_unlock_bh(&conn->state_lock);
4108                 complete(&conn->conn_wait_comp);
4109                 wait_for_completion(&conn->conn_post_wait_comp);
4110                 spin_lock_bh(&conn->state_lock);
4111         }
4112
4113         /*
4114          * If connection reinstatement is being performed on this connection
4115          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4116          * connection wait rcfr semaphore that is being blocked on
4117          * an iscsit_connection_reinstatement_rcfr().
4118          */
4119         if (atomic_read(&conn->connection_wait_rcfr)) {
4120                 spin_unlock_bh(&conn->state_lock);
4121                 complete(&conn->conn_wait_rcfr_comp);
4122                 wait_for_completion(&conn->conn_post_wait_comp);
4123                 spin_lock_bh(&conn->state_lock);
4124         }
4125         atomic_set(&conn->connection_reinstatement, 1);
4126         spin_unlock_bh(&conn->state_lock);
4127
4128         /*
4129          * If any other processes are accessing this connection pointer we
4130          * must wait until they have completed.
4131          */
4132         iscsit_check_conn_usage_count(conn);
4133
4134         if (conn->conn_rx_hash.tfm)
4135                 crypto_free_hash(conn->conn_rx_hash.tfm);
4136         if (conn->conn_tx_hash.tfm)
4137                 crypto_free_hash(conn->conn_tx_hash.tfm);
4138
4139         if (conn->conn_cpumask)
4140                 free_cpumask_var(conn->conn_cpumask);
4141
4142         kfree(conn->conn_ops);
4143         conn->conn_ops = NULL;
4144
4145         if (conn->sock) {
4146                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4147                         kfree(conn->sock->file);
4148                         conn->sock->file = NULL;
4149                 }
4150                 sock_release(conn->sock);
4151         }
4152         conn->thread_set = NULL;
4153
4154         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4155         conn->conn_state = TARG_CONN_STATE_FREE;
4156         kfree(conn);
4157
4158         spin_lock_bh(&sess->conn_lock);
4159         atomic_dec(&sess->nconn);
4160         pr_debug("Decremented iSCSI connection count to %hu from node:"
4161                 " %s\n", atomic_read(&sess->nconn),
4162                 sess->sess_ops->InitiatorName);
4163         /*
4164          * Make sure that if one connection fails in an non ERL=2 iSCSI
4165          * Session that they all fail.
4166          */
4167         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4168              !atomic_read(&sess->session_logout))
4169                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4170
4171         /*
4172          * If this was not the last connection in the session, and we are
4173          * performing session reinstatement or falling back to ERL=0, call
4174          * iscsit_stop_session() without sleeping to shutdown the other
4175          * active connections.
4176          */
4177         if (atomic_read(&sess->nconn)) {
4178                 if (!atomic_read(&sess->session_reinstatement) &&
4179                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4180                         spin_unlock_bh(&sess->conn_lock);
4181                         return 0;
4182                 }
4183                 if (!atomic_read(&sess->session_stop_active)) {
4184                         atomic_set(&sess->session_stop_active, 1);
4185                         spin_unlock_bh(&sess->conn_lock);
4186                         iscsit_stop_session(sess, 0, 0);
4187                         return 0;
4188                 }
4189                 spin_unlock_bh(&sess->conn_lock);
4190                 return 0;
4191         }
4192
4193         /*
4194          * If this was the last connection in the session and one of the
4195          * following is occurring:
4196          *
4197          * Session Reinstatement is not being performed, and are falling back
4198          * to ERL=0 call iscsit_close_session().
4199          *
4200          * Session Logout was requested.  iscsit_close_session() will be called
4201          * elsewhere.
4202          *
4203          * Session Continuation is not being performed, start the Time2Retain
4204          * handler and check if sleep_on_sess_wait_sem is active.
4205          */
4206         if (!atomic_read(&sess->session_reinstatement) &&
4207              atomic_read(&sess->session_fall_back_to_erl0)) {
4208                 spin_unlock_bh(&sess->conn_lock);
4209                 target_put_session(sess->se_sess);
4210
4211                 return 0;
4212         } else if (atomic_read(&sess->session_logout)) {
4213                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4214                 sess->session_state = TARG_SESS_STATE_FREE;
4215                 spin_unlock_bh(&sess->conn_lock);
4216
4217                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4218                         complete(&sess->session_wait_comp);
4219
4220                 return 0;
4221         } else {
4222                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4223                 sess->session_state = TARG_SESS_STATE_FAILED;
4224
4225                 if (!atomic_read(&sess->session_continuation)) {
4226                         spin_unlock_bh(&sess->conn_lock);
4227                         iscsit_start_time2retain_handler(sess);
4228                 } else
4229                         spin_unlock_bh(&sess->conn_lock);
4230
4231                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4232                         complete(&sess->session_wait_comp);
4233
4234                 return 0;
4235         }
4236         spin_unlock_bh(&sess->conn_lock);
4237
4238         return 0;
4239 }
4240
4241 int iscsit_close_session(struct iscsi_session *sess)
4242 {
4243         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4244         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4245
4246         if (atomic_read(&sess->nconn)) {
4247                 pr_err("%d connection(s) still exist for iSCSI session"
4248                         " to %s\n", atomic_read(&sess->nconn),
4249                         sess->sess_ops->InitiatorName);
4250                 BUG();
4251         }
4252
4253         spin_lock_bh(&se_tpg->session_lock);
4254         atomic_set(&sess->session_logout, 1);
4255         atomic_set(&sess->session_reinstatement, 1);
4256         iscsit_stop_time2retain_timer(sess);
4257         spin_unlock_bh(&se_tpg->session_lock);
4258
4259         /*
4260          * transport_deregister_session_configfs() will clear the
4261          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4262          * can be setting it again with __transport_register_session() in
4263          * iscsi_post_login_handler() again after the iscsit_stop_session()
4264          * completes in iscsi_np context.
4265          */
4266         transport_deregister_session_configfs(sess->se_sess);
4267
4268         /*
4269          * If any other processes are accessing this session pointer we must
4270          * wait until they have completed.  If we are in an interrupt (the
4271          * time2retain handler) and contain and active session usage count we
4272          * restart the timer and exit.
4273          */
4274         if (!in_interrupt()) {
4275                 if (iscsit_check_session_usage_count(sess) == 1)
4276                         iscsit_stop_session(sess, 1, 1);
4277         } else {
4278                 if (iscsit_check_session_usage_count(sess) == 2) {
4279                         atomic_set(&sess->session_logout, 0);
4280                         iscsit_start_time2retain_handler(sess);
4281                         return 0;
4282                 }
4283         }
4284
4285         transport_deregister_session(sess->se_sess);
4286
4287         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4288                 iscsit_free_connection_recovery_entires(sess);
4289
4290         iscsit_free_all_ooo_cmdsns(sess);
4291
4292         spin_lock_bh(&se_tpg->session_lock);
4293         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4294         sess->session_state = TARG_SESS_STATE_FREE;
4295         pr_debug("Released iSCSI session from node: %s\n",
4296                         sess->sess_ops->InitiatorName);
4297         tpg->nsessions--;
4298         if (tpg->tpg_tiqn)
4299                 tpg->tpg_tiqn->tiqn_nsessions--;
4300
4301         pr_debug("Decremented number of active iSCSI Sessions on"
4302                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4303
4304         spin_lock(&sess_idr_lock);
4305         idr_remove(&sess_idr, sess->session_index);
4306         spin_unlock(&sess_idr_lock);
4307
4308         kfree(sess->sess_ops);
4309         sess->sess_ops = NULL;
4310         spin_unlock_bh(&se_tpg->session_lock);
4311
4312         kfree(sess);
4313         return 0;
4314 }
4315
4316 static void iscsit_logout_post_handler_closesession(
4317         struct iscsi_conn *conn)
4318 {
4319         struct iscsi_session *sess = conn->sess;
4320
4321         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4322         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4323
4324         atomic_set(&conn->conn_logout_remove, 0);
4325         complete(&conn->conn_logout_comp);
4326
4327         iscsit_dec_conn_usage_count(conn);
4328         iscsit_stop_session(sess, 1, 1);
4329         iscsit_dec_session_usage_count(sess);
4330         target_put_session(sess->se_sess);
4331 }
4332
4333 static void iscsit_logout_post_handler_samecid(
4334         struct iscsi_conn *conn)
4335 {
4336         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4337         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4338
4339         atomic_set(&conn->conn_logout_remove, 0);
4340         complete(&conn->conn_logout_comp);
4341
4342         iscsit_cause_connection_reinstatement(conn, 1);
4343         iscsit_dec_conn_usage_count(conn);
4344 }
4345
4346 static void iscsit_logout_post_handler_diffcid(
4347         struct iscsi_conn *conn,
4348         u16 cid)
4349 {
4350         struct iscsi_conn *l_conn;
4351         struct iscsi_session *sess = conn->sess;
4352
4353         if (!sess)
4354                 return;
4355
4356         spin_lock_bh(&sess->conn_lock);
4357         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4358                 if (l_conn->cid == cid) {
4359                         iscsit_inc_conn_usage_count(l_conn);
4360                         break;
4361                 }
4362         }
4363         spin_unlock_bh(&sess->conn_lock);
4364
4365         if (!l_conn)
4366                 return;
4367
4368         if (l_conn->sock)
4369                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4370
4371         spin_lock_bh(&l_conn->state_lock);
4372         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4373         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4374         spin_unlock_bh(&l_conn->state_lock);
4375
4376         iscsit_cause_connection_reinstatement(l_conn, 1);
4377         iscsit_dec_conn_usage_count(l_conn);
4378 }
4379
4380 /*
4381  *      Return of 0 causes the TX thread to restart.
4382  */
4383 static int iscsit_logout_post_handler(
4384         struct iscsi_cmd *cmd,
4385         struct iscsi_conn *conn)
4386 {
4387         int ret = 0;
4388
4389         switch (cmd->logout_reason) {
4390         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4391                 switch (cmd->logout_response) {
4392                 case ISCSI_LOGOUT_SUCCESS:
4393                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4394                 default:
4395                         iscsit_logout_post_handler_closesession(conn);
4396                         break;
4397                 }
4398                 ret = 0;
4399                 break;
4400         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4401                 if (conn->cid == cmd->logout_cid) {
4402                         switch (cmd->logout_response) {
4403                         case ISCSI_LOGOUT_SUCCESS:
4404                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4405                         default:
4406                                 iscsit_logout_post_handler_samecid(conn);
4407                                 break;
4408                         }
4409                         ret = 0;
4410                 } else {
4411                         switch (cmd->logout_response) {
4412                         case ISCSI_LOGOUT_SUCCESS:
4413                                 iscsit_logout_post_handler_diffcid(conn,
4414                                         cmd->logout_cid);
4415                                 break;
4416                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4417                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4418                         default:
4419                                 break;
4420                         }
4421                         ret = 1;
4422                 }
4423                 break;
4424         case ISCSI_LOGOUT_REASON_RECOVERY:
4425                 switch (cmd->logout_response) {
4426                 case ISCSI_LOGOUT_SUCCESS:
4427                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4428                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4429                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4430                 default:
4431                         break;
4432                 }
4433                 ret = 1;
4434                 break;
4435         default:
4436                 break;
4437
4438         }
4439         return ret;
4440 }
4441
4442 void iscsit_fail_session(struct iscsi_session *sess)
4443 {
4444         struct iscsi_conn *conn;
4445
4446         spin_lock_bh(&sess->conn_lock);
4447         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4448                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4449                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4450         }
4451         spin_unlock_bh(&sess->conn_lock);
4452
4453         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4454         sess->session_state = TARG_SESS_STATE_FAILED;
4455 }
4456
4457 int iscsit_free_session(struct iscsi_session *sess)
4458 {
4459         u16 conn_count = atomic_read(&sess->nconn);
4460         struct iscsi_conn *conn, *conn_tmp = NULL;
4461         int is_last;
4462
4463         spin_lock_bh(&sess->conn_lock);
4464         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4465
4466         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4467                         conn_list) {
4468                 if (conn_count == 0)
4469                         break;
4470
4471                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4472                         is_last = 1;
4473                 } else {
4474                         iscsit_inc_conn_usage_count(conn_tmp);
4475                         is_last = 0;
4476                 }
4477                 iscsit_inc_conn_usage_count(conn);
4478
4479                 spin_unlock_bh(&sess->conn_lock);
4480                 iscsit_cause_connection_reinstatement(conn, 1);
4481                 spin_lock_bh(&sess->conn_lock);
4482
4483                 iscsit_dec_conn_usage_count(conn);
4484                 if (is_last == 0)
4485                         iscsit_dec_conn_usage_count(conn_tmp);
4486
4487                 conn_count--;
4488         }
4489
4490         if (atomic_read(&sess->nconn)) {
4491                 spin_unlock_bh(&sess->conn_lock);
4492                 wait_for_completion(&sess->session_wait_comp);
4493         } else
4494                 spin_unlock_bh(&sess->conn_lock);
4495
4496         target_put_session(sess->se_sess);
4497         return 0;
4498 }
4499
4500 void iscsit_stop_session(
4501         struct iscsi_session *sess,
4502         int session_sleep,
4503         int connection_sleep)
4504 {
4505         u16 conn_count = atomic_read(&sess->nconn);
4506         struct iscsi_conn *conn, *conn_tmp = NULL;
4507         int is_last;
4508
4509         spin_lock_bh(&sess->conn_lock);
4510         if (session_sleep)
4511                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4512
4513         if (connection_sleep) {
4514                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4515                                 conn_list) {
4516                         if (conn_count == 0)
4517                                 break;
4518
4519                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4520                                 is_last = 1;
4521                         } else {
4522                                 iscsit_inc_conn_usage_count(conn_tmp);
4523                                 is_last = 0;
4524                         }
4525                         iscsit_inc_conn_usage_count(conn);
4526
4527                         spin_unlock_bh(&sess->conn_lock);
4528                         iscsit_cause_connection_reinstatement(conn, 1);
4529                         spin_lock_bh(&sess->conn_lock);
4530
4531                         iscsit_dec_conn_usage_count(conn);
4532                         if (is_last == 0)
4533                                 iscsit_dec_conn_usage_count(conn_tmp);
4534                         conn_count--;
4535                 }
4536         } else {
4537                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4538                         iscsit_cause_connection_reinstatement(conn, 0);
4539         }
4540
4541         if (session_sleep && atomic_read(&sess->nconn)) {
4542                 spin_unlock_bh(&sess->conn_lock);
4543                 wait_for_completion(&sess->session_wait_comp);
4544         } else
4545                 spin_unlock_bh(&sess->conn_lock);
4546 }
4547
4548 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4549 {
4550         struct iscsi_session *sess;
4551         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4552         struct se_session *se_sess, *se_sess_tmp;
4553         int session_count = 0;
4554
4555         spin_lock_bh(&se_tpg->session_lock);
4556         if (tpg->nsessions && !force) {
4557                 spin_unlock_bh(&se_tpg->session_lock);
4558                 return -1;
4559         }
4560
4561         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4562                         sess_list) {
4563                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4564
4565                 spin_lock(&sess->conn_lock);
4566                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4567                     atomic_read(&sess->session_logout) ||
4568                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4569                         spin_unlock(&sess->conn_lock);
4570                         continue;
4571                 }
4572                 atomic_set(&sess->session_reinstatement, 1);
4573                 spin_unlock(&sess->conn_lock);
4574                 spin_unlock_bh(&se_tpg->session_lock);
4575
4576                 iscsit_free_session(sess);
4577                 spin_lock_bh(&se_tpg->session_lock);
4578
4579                 session_count++;
4580         }
4581         spin_unlock_bh(&se_tpg->session_lock);
4582
4583         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4584                         " Group: %hu\n", session_count, tpg->tpgt);
4585         return 0;
4586 }
4587
4588 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4589 MODULE_VERSION("4.1.x");
4590 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4591 MODULE_LICENSE("GPL");
4592
4593 module_init(iscsi_target_init_module);
4594 module_exit(iscsi_target_cleanup_module);