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         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 148
 149         idr_preload(GFP_KERNEL);
 150         spin_lock(&tiqn_lock);
 151
 152         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 153         if (ret < 0) {
 154                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 155                 spin_unlock(&tiqn_lock);
 156                 idr_preload_end();
 157                 kfree(tiqn);
 158                 return ERR_PTR(ret);
 159         }
 160         tiqn->tiqn_index = ret;
 161         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 162
 163         spin_unlock(&tiqn_lock);
 164         idr_preload_end();
 165
 166         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 167
 168         return tiqn;
 169
 170 }
 171
 172 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 173 {
 174         /*
 175          * Wait for accesses to said struct iscsi_tiqn to end.
 176          */
 177         spin_lock(&tiqn->tiqn_state_lock);
 178         while (tiqn->tiqn_access_count != 0) {
 179                 spin_unlock(&tiqn->tiqn_state_lock);
 180                 msleep(10);
 181                 spin_lock(&tiqn->tiqn_state_lock);
 182         }
 183         spin_unlock(&tiqn->tiqn_state_lock);
 184 }
 185
 186 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 187 {
 188         /*
 189          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 190          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 191          * attempts to access this struct iscsi_tiqn will fail from both transport
 192          * fabric and control code paths.
 193          */
 194         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 195                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 196                 return;
 197         }
 198
 199         iscsit_wait_for_tiqn(tiqn);
 200
 201         spin_lock(&tiqn_lock);
 202         list_del(&tiqn->tiqn_list);
 203         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 204         spin_unlock(&tiqn_lock);
 205
 206         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 207                         tiqn->tiqn);
 208         kfree(tiqn);
 209 }
 210
 211 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 212 {
 213         int ret;
 214         /*
 215          * Determine if the network portal is accepting storage traffic.
 216          */
 217         spin_lock_bh(&np->np_thread_lock);
 218         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 219                 spin_unlock_bh(&np->np_thread_lock);
 220                 return -1;
 221         }
 222         if (np->np_login_tpg) {
 223                 pr_err("np->np_login_tpg() is not NULL!\n");
 224                 spin_unlock_bh(&np->np_thread_lock);
 225                 return -1;
 226         }
 227         spin_unlock_bh(&np->np_thread_lock);
 228         /*
 229          * Determine if the portal group is accepting storage traffic.
 230          */
 231         spin_lock_bh(&tpg->tpg_state_lock);
 232         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 233                 spin_unlock_bh(&tpg->tpg_state_lock);
 234                 return -1;
 235         }
 236         spin_unlock_bh(&tpg->tpg_state_lock);
 237
 238         /*
 239          * Here we serialize access across the TIQN+TPG Tuple.
 240          */
 241         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 242         if ((ret != 0) || signal_pending(current))
 243                 return -1;
 244
 245         spin_lock_bh(&np->np_thread_lock);
 246         np->np_login_tpg = tpg;
 247         spin_unlock_bh(&np->np_thread_lock);
 248
 249         return 0;
 250 }
 251
 252 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 253 {
 254         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 255
 256         spin_lock_bh(&np->np_thread_lock);
 257         np->np_login_tpg = NULL;
 258         spin_unlock_bh(&np->np_thread_lock);
 259
 260         mutex_unlock(&tpg->np_login_lock);
 261
 262         if (tiqn)
 263                 iscsit_put_tiqn_for_login(tiqn);
 264
 265         return 0;
 266 }
 267
 268 bool iscsit_check_np_match(
 269         struct __kernel_sockaddr_storage *sockaddr,
 270         struct iscsi_np *np,
 271         int network_transport)
 272 {
 273         struct sockaddr_in *sock_in, *sock_in_e;
 274         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 275         bool ip_match = false;
 276         u16 port;
 277
 278         if (sockaddr->ss_family == AF_INET6) {
 279                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 280                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 281
 282                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 283                             &sock_in6_e->sin6_addr.in6_u,
 284                             sizeof(struct in6_addr)))
 285                         ip_match = true;
 286
 287                 port = ntohs(sock_in6->sin6_port);
 288         } else {
 289                 sock_in = (struct sockaddr_in *)sockaddr;
 290                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 291
 292                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 293                         ip_match = true;
 294
 295                 port = ntohs(sock_in->sin_port);
 296         }
 297
 298         if ((ip_match == true) && (np->np_port == port) &&
 299             (np->np_network_transport == network_transport))
 300                 return true;
 301
 302         return false;
 303 }
 304
 305 static struct iscsi_np *iscsit_get_np(
 306         struct __kernel_sockaddr_storage *sockaddr,
 307         int network_transport)
 308 {
 309         struct iscsi_np *np;
 310         bool match;
 311
 312         spin_lock_bh(&np_lock);
 313         list_for_each_entry(np, &g_np_list, np_list) {
 314                 spin_lock(&np->np_thread_lock);
 315                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 316                         spin_unlock(&np->np_thread_lock);
 317                         continue;
 318                 }
 319
 320                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 321                 if (match == true) {
 322                         /*
 323                          * Increment the np_exports reference count now to
 324                          * prevent iscsit_del_np() below from being called
 325                          * while iscsi_tpg_add_network_portal() is called.
 326                          */
 327                         np->np_exports++;
 328                         spin_unlock(&np->np_thread_lock);
 329                         spin_unlock_bh(&np_lock);
 330                         return np;
 331                 }
 332                 spin_unlock(&np->np_thread_lock);
 333         }
 334         spin_unlock_bh(&np_lock);
 335
 336         return NULL;
 337 }
 338
 339 struct iscsi_np *iscsit_add_np(
 340         struct __kernel_sockaddr_storage *sockaddr,
 341         char *ip_str,
 342         int network_transport)
 343 {
 344         struct sockaddr_in *sock_in;
 345         struct sockaddr_in6 *sock_in6;
 346         struct iscsi_np *np;
 347         int ret;
 348         /*
 349          * Locate the existing struct iscsi_np if already active..
 350          */
 351         np = iscsit_get_np(sockaddr, network_transport);
 352         if (np)
 353                 return np;
 354
 355         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 356         if (!np) {
 357                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 358                 return ERR_PTR(-ENOMEM);
 359         }
 360
 361         np->np_flags |= NPF_IP_NETWORK;
 362         if (sockaddr->ss_family == AF_INET6) {
 363                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 364                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 365                 np->np_port = ntohs(sock_in6->sin6_port);
 366         } else {
 367                 sock_in = (struct sockaddr_in *)sockaddr;
 368                 sprintf(np->np_ip, "%s", ip_str);
 369                 np->np_port = ntohs(sock_in->sin_port);
 370         }
 371
 372         np->np_network_transport = network_transport;
 373         spin_lock_init(&np->np_thread_lock);
 374         init_completion(&np->np_restart_comp);
 375         INIT_LIST_HEAD(&np->np_list);
 376
 377         ret = iscsi_target_setup_login_socket(np, sockaddr);
 378         if (ret != 0) {
 379                 kfree(np);
 380                 return ERR_PTR(ret);
 381         }
 382
 383         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 384         if (IS_ERR(np->np_thread)) {
 385                 pr_err("Unable to create kthread: iscsi_np\n");
 386                 ret = PTR_ERR(np->np_thread);
 387                 kfree(np);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398
 399         spin_lock_bh(&np_lock);
 400         list_add_tail(&np->np_list, &g_np_list);
 401         spin_unlock_bh(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 404                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 405                 "TCP" : "SCTP");
 406
 407         return np;
 408 }
 409
 410 int iscsit_reset_np_thread(
 411         struct iscsi_np *np,
 412         struct iscsi_tpg_np *tpg_np,
 413         struct iscsi_portal_group *tpg)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (tpg && tpg_np) {
 417                 /*
 418                  * The reset operation need only be performed when the
 419                  * passed struct iscsi_portal_group has a login in progress
 420                  * to one of the network portals.
 421                  */
 422                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 423                         spin_unlock_bh(&np->np_thread_lock);
 424                         return 0;
 425                 }
 426         }
 427         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 return 0;
 430         }
 431         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 432
 433         if (np->np_thread) {
 434                 spin_unlock_bh(&np->np_thread_lock);
 435                 send_sig(SIGINT, np->np_thread, 1);
 436                 wait_for_completion(&np->np_restart_comp);
 437                 spin_lock_bh(&np->np_thread_lock);
 438         }
 439         spin_unlock_bh(&np->np_thread_lock);
 440
 441         return 0;
 442 }
 443
 444 static int iscsit_del_np_comm(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448         return 0;
 449 }
 450
 451 int iscsit_del_np(struct iscsi_np *np)
 452 {
 453         spin_lock_bh(&np->np_thread_lock);
 454         np->np_exports--;
 455         if (np->np_exports) {
 456                 spin_unlock_bh(&np->np_thread_lock);
 457                 return 0;
 458         }
 459         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 460         spin_unlock_bh(&np->np_thread_lock);
 461
 462         if (np->np_thread) {
 463                 /*
 464                  * We need to send the signal to wakeup Linux/Net
 465                  * which may be sleeping in sock_accept()..
 466                  */
 467                 send_sig(SIGINT, np->np_thread, 1);
 468                 kthread_stop(np->np_thread);
 469         }
 470         iscsit_del_np_comm(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 478                 "TCP" : "SCTP");
 479
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int __init iscsi_target_init_module(void)
 485 {
 486         int ret = 0;
 487
 488         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 489
 490         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 491         if (!iscsit_global) {
 492                 pr_err("Unable to allocate memory for iscsit_global\n");
 493                 return -1;
 494         }
 495         mutex_init(&auth_id_lock);
 496         spin_lock_init(&sess_idr_lock);
 497         idr_init(&tiqn_idr);
 498         idr_init(&sess_idr);
 499
 500         ret = iscsi_target_register_configfs();
 501         if (ret < 0)
 502                 goto out;
 503
 504         ret = iscsi_thread_set_init();
 505         if (ret < 0)
 506                 goto configfs_out;
 507
 508         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 509                         TARGET_THREAD_SET_COUNT) {
 510                 pr_err("iscsi_allocate_thread_sets() returned"
 511                         " unexpected value!\n");
 512                 goto ts_out1;
 513         }
 514
 515         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 516                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 517                         0, NULL);
 518         if (!lio_cmd_cache) {
 519                 pr_err("Unable to kmem_cache_create() for"
 520                                 " lio_cmd_cache\n");
 521                 goto ts_out2;
 522         }
 523
 524         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 525                         sizeof(struct iscsi_queue_req),
 526                         __alignof__(struct iscsi_queue_req), 0, NULL);
 527         if (!lio_qr_cache) {
 528                 pr_err("nable to kmem_cache_create() for"
 529                                 " lio_qr_cache\n");
 530                 goto cmd_out;
 531         }
 532
 533         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 534                         sizeof(struct iscsi_datain_req),
 535                         __alignof__(struct iscsi_datain_req), 0, NULL);
 536         if (!lio_dr_cache) {
 537                 pr_err("Unable to kmem_cache_create() for"
 538                                 " lio_dr_cache\n");
 539                 goto qr_out;
 540         }
 541
 542         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 543                         sizeof(struct iscsi_ooo_cmdsn),
 544                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 545         if (!lio_ooo_cache) {
 546                 pr_err("Unable to kmem_cache_create() for"
 547                                 " lio_ooo_cache\n");
 548                 goto dr_out;
 549         }
 550
 551         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 552                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 553                         0, NULL);
 554         if (!lio_r2t_cache) {
 555                 pr_err("Unable to kmem_cache_create() for"
 556                                 " lio_r2t_cache\n");
 557                 goto ooo_out;
 558         }
 559
 560         if (iscsit_load_discovery_tpg() < 0)
 561                 goto r2t_out;
 562
 563         return ret;
 564 r2t_out:
 565         kmem_cache_destroy(lio_r2t_cache);
 566 ooo_out:
 567         kmem_cache_destroy(lio_ooo_cache);
 568 dr_out:
 569         kmem_cache_destroy(lio_dr_cache);
 570 qr_out:
 571         kmem_cache_destroy(lio_qr_cache);
 572 cmd_out:
 573         kmem_cache_destroy(lio_cmd_cache);
 574 ts_out2:
 575         iscsi_deallocate_thread_sets();
 576 ts_out1:
 577         iscsi_thread_set_free();
 578 configfs_out:
 579         iscsi_target_deregister_configfs();
 580 out:
 581         kfree(iscsit_global);
 582         return -ENOMEM;
 583 }
 584
 585 static void __exit iscsi_target_cleanup_module(void)
 586 {
 587         iscsi_deallocate_thread_sets();
 588         iscsi_thread_set_free();
 589         iscsit_release_discovery_tpg();
 590         kmem_cache_destroy(lio_cmd_cache);
 591         kmem_cache_destroy(lio_qr_cache);
 592         kmem_cache_destroy(lio_dr_cache);
 593         kmem_cache_destroy(lio_ooo_cache);
 594         kmem_cache_destroy(lio_r2t_cache);
 595
 596         iscsi_target_deregister_configfs();
 597
 598         kfree(iscsit_global);
 599 }
 600
 601 static int iscsit_add_reject(
 602         u8 reason,
 603         int fail_conn,
 604         unsigned char *buf,
 605         struct iscsi_conn *conn)
 606 {
 607         struct iscsi_cmd *cmd;
 608         struct iscsi_reject *hdr;
 609         int ret;
 610
 611         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 612         if (!cmd)
 613                 return -1;
 614
 615         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 616         if (fail_conn)
 617                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 618
 619         hdr     = (struct iscsi_reject *) cmd->pdu;
 620         hdr->reason = reason;
 621
 622         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 623         if (!cmd->buf_ptr) {
 624                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 625                 iscsit_release_cmd(cmd);
 626                 return -1;
 627         }
 628
 629         spin_lock_bh(&conn->cmd_lock);
 630         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 631         spin_unlock_bh(&conn->cmd_lock);
 632
 633         cmd->i_state = ISTATE_SEND_REJECT;
 634         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 635
 636         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 637         if (ret != 0)
 638                 return -1;
 639
 640         return (!fail_conn) ? 0 : -1;
 641 }
 642
 643 int iscsit_add_reject_from_cmd(
 644         u8 reason,
 645         int fail_conn,
 646         int add_to_conn,
 647         unsigned char *buf,
 648         struct iscsi_cmd *cmd)
 649 {
 650         struct iscsi_conn *conn;
 651         struct iscsi_reject *hdr;
 652         int ret;
 653
 654         if (!cmd->conn) {
 655                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 656                                 cmd->init_task_tag);
 657                 return -1;
 658         }
 659         conn = cmd->conn;
 660
 661         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 662         if (fail_conn)
 663                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 664
 665         hdr     = (struct iscsi_reject *) cmd->pdu;
 666         hdr->reason = reason;
 667
 668         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 669         if (!cmd->buf_ptr) {
 670                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 671                 iscsit_release_cmd(cmd);
 672                 return -1;
 673         }
 674
 675         if (add_to_conn) {
 676                 spin_lock_bh(&conn->cmd_lock);
 677                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 678                 spin_unlock_bh(&conn->cmd_lock);
 679         }
 680
 681         cmd->i_state = ISTATE_SEND_REJECT;
 682         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 683
 684         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 685         if (ret != 0)
 686                 return -1;
 687
 688         return (!fail_conn) ? 0 : -1;
 689 }
 690
 691 /*
 692  * Map some portion of the allocated scatterlist to an iovec, suitable for
 693  * kernel sockets to copy data in/out.
 694  */
 695 static int iscsit_map_iovec(
 696         struct iscsi_cmd *cmd,
 697         struct kvec *iov,
 698         u32 data_offset,
 699         u32 data_length)
 700 {
 701         u32 i = 0;
 702         struct scatterlist *sg;
 703         unsigned int page_off;
 704
 705         /*
 706          * We know each entry in t_data_sg contains a page.
 707          */
 708         sg = &cmd->se_cmd.t_data_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                     iscsi_sna_lt(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 = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 767
 768         iov_count += ISCSI_IOV_DATA_BUFFER;
 769
 770         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 771         if (!cmd->iov_data) {
 772                 pr_err("Unable to allocate cmd->iov_data\n");
 773                 return -ENOMEM;
 774         }
 775
 776         cmd->orig_iov_data_count = iov_count;
 777         return 0;
 778 }
 779
 780 static int iscsit_handle_scsi_cmd(
 781         struct iscsi_conn *conn,
 782         unsigned char *buf)
 783 {
 784         int data_direction, payload_length, cmdsn_ret = 0, immed_ret;
 785         struct iscsi_cmd *cmd = NULL;
 786         struct iscsi_scsi_req *hdr;
 787         int iscsi_task_attr;
 788         int sam_task_attr;
 789
 790         spin_lock_bh(&conn->sess->session_stats_lock);
 791         conn->sess->cmd_pdus++;
 792         if (conn->sess->se_sess->se_node_acl) {
 793                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 794                 conn->sess->se_sess->se_node_acl->num_cmds++;
 795                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 796         }
 797         spin_unlock_bh(&conn->sess->session_stats_lock);
 798
 799         hdr                     = (struct iscsi_scsi_req *) buf;
 800         payload_length          = ntoh24(hdr->dlength);
 801
 802         /* FIXME; Add checks for AdditionalHeaderSegment */
 803
 804         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 805             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 806                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 807                                 " not set. Bad iSCSI Initiator.\n");
 808                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 809                                 buf, conn);
 810         }
 811
 812         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 813              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 814                 /*
 815                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 816                  * that adds support for RESERVE/RELEASE.  There is a bug
 817                  * add with this new functionality that sets R/W bits when
 818                  * neither CDB carries any READ or WRITE datapayloads.
 819                  */
 820                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 821                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 822                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 823                         goto done;
 824                 }
 825
 826                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 827                         " set when Expected Data Transfer Length is 0 for"
 828                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 829                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 830                                 buf, conn);
 831         }
 832 done:
 833
 834         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 835             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 836                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 837                         " MUST be set if Expected Data Transfer Length is not 0."
 838                         " Bad iSCSI Initiator\n");
 839                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 840                                 buf, conn);
 841         }
 842
 843         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 844             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 845                 pr_err("Bidirectional operations not supported!\n");
 846                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 847                                 buf, conn);
 848         }
 849
 850         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 851                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 852                                 " Scsi Command PDU.\n");
 853                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 854                                 buf, conn);
 855         }
 856
 857         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 858                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 859                         " protocol error.\n", payload_length);
 860                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 861                                 buf, conn);
 862         }
 863
 864         if ((be32_to_cpu(hdr->data_length )== payload_length) &&
 865             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 866                 pr_err("Expected Data Transfer Length and Length of"
 867                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 868                         " bit is not set protocol error\n");
 869                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 870                                 buf, conn);
 871         }
 872
 873         if (payload_length > be32_to_cpu(hdr->data_length)) {
 874                 pr_err("DataSegmentLength: %u is greater than"
 875                         " EDTL: %u, protocol error.\n", payload_length,
 876                                 hdr->data_length);
 877                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 878                                 buf, conn);
 879         }
 880
 881         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 882                 pr_err("DataSegmentLength: %u is greater than"
 883                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 884                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 885                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 886                                 buf, conn);
 887         }
 888
 889         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 890                 pr_err("DataSegmentLength: %u is greater than"
 891                         " FirstBurstLength: %u, protocol error.\n",
 892                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 893                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 894                                         buf, conn);
 895         }
 896
 897         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 898                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 899                           DMA_NONE;
 900
 901         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 902         if (!cmd)
 903                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 904                                          buf, conn);
 905
 906         cmd->data_direction = data_direction;
 907         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 908         /*
 909          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 910          */
 911         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 912             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 913                 sam_task_attr = MSG_SIMPLE_TAG;
 914         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 915                 sam_task_attr = MSG_ORDERED_TAG;
 916         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 917                 sam_task_attr = MSG_HEAD_TAG;
 918         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 919                 sam_task_attr = MSG_ACA_TAG;
 920         else {
 921                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 922                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 923                 sam_task_attr = MSG_SIMPLE_TAG;
 924         }
 925
 926         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 927         cmd->i_state            = ISTATE_NEW_CMD;
 928         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 929         cmd->immediate_data     = (payload_length) ? 1 : 0;
 930         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 931                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 932         if (cmd->unsolicited_data)
 933                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 934
 935         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 936         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 937                 spin_lock_bh(&conn->sess->ttt_lock);
 938                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 939                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 940                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 941                 spin_unlock_bh(&conn->sess->ttt_lock);
 942         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 943                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 944         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 945         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 946         cmd->first_burst_len    = payload_length;
 947
 948         if (cmd->data_direction == DMA_FROM_DEVICE) {
 949                 struct iscsi_datain_req *dr;
 950
 951                 dr = iscsit_allocate_datain_req();
 952                 if (!dr)
 953                         return iscsit_add_reject_from_cmd(
 954                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 955                                         1, 1, buf, cmd);
 956
 957                 iscsit_attach_datain_req(cmd, dr);
 958         }
 959
 960         /*
 961          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 962          */
 963         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 964                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 965                         cmd->data_direction, sam_task_attr,
 966                         cmd->sense_buffer + 2);
 967
 968         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 969                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 970                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 971
 972         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 973                                                      scsilun_to_int(&hdr->lun));
 974         if (cmd->sense_reason)
 975                 goto attach_cmd;
 976
 977         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 978         if (cmd->sense_reason) {
 979                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
 980                         return iscsit_add_reject_from_cmd(
 981                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 982                                         1, 1, buf, cmd);
 983                 }
 984
 985                 goto attach_cmd;
 986         }
 987
 988         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
 989                 return iscsit_add_reject_from_cmd(
 990                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 991                         1, 1, buf, cmd);
 992         }
 993
 994 attach_cmd:
 995         spin_lock_bh(&conn->cmd_lock);
 996         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 997         spin_unlock_bh(&conn->cmd_lock);
 998         /*
 999          * Check if we need to delay processing because of ALUA
1000          * Active/NonOptimized primary access state..
1001          */
1002         core_alua_check_nonop_delay(&cmd->se_cmd);
1003
1004         if (iscsit_allocate_iovecs(cmd) < 0) {
1005                 return iscsit_add_reject_from_cmd(
1006                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1007                                 1, 0, buf, cmd);
1008         }
1009
1010         /*
1011          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1012          * the Immediate Bit is not set, and no Immediate
1013          * Data is attached.
1014          *
1015          * A PDU/CmdSN carrying Immediate Data can only
1016          * be processed after the DataCRC has passed.
1017          * If the DataCRC fails, the CmdSN MUST NOT
1018          * be acknowledged. (See below)
1019          */
1020         if (!cmd->immediate_data) {
1021                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1022                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1023                         return 0;
1024                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1025                         return iscsit_add_reject_from_cmd(
1026                                 ISCSI_REASON_PROTOCOL_ERROR,
1027                                 1, 0, buf, cmd);
1028         }
1029
1030         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1031
1032         /*
1033          * If no Immediate Data is attached, it's OK to return now.
1034          */
1035         if (!cmd->immediate_data) {
1036                 if (!cmd->sense_reason && cmd->unsolicited_data) {
1037                         iscsit_set_dataout_sequence_values(cmd);
1038
1039                         spin_lock_bh(&cmd->dataout_timeout_lock);
1040                         iscsit_start_dataout_timer(cmd, cmd->conn);
1041                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1042                 }
1043
1044                 return 0;
1045         }
1046
1047         /*
1048          * Early CHECK_CONDITIONs never make it to the transport processing
1049          * thread.  They are processed in CmdSN order by
1050          * iscsit_check_received_cmdsn() below.
1051          */
1052         if (cmd->sense_reason) {
1053                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1054                 goto after_immediate_data;
1055         }
1056         /*
1057          * Call directly into transport_generic_new_cmd() to perform
1058          * the backend memory allocation.
1059          */
1060         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1061         if (cmd->sense_reason) {
1062                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1063                 goto after_immediate_data;
1064         }
1065
1066         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1067 after_immediate_data:
1068         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1069                 /*
1070                  * A PDU/CmdSN carrying Immediate Data passed
1071                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1072                  * Immediate Bit is not set.
1073                  */
1074                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1075                 /*
1076                  * Special case for Unsupported SAM WRITE Opcodes
1077                  * and ImmediateData=Yes.
1078                  */
1079                 if (cmd->sense_reason) {
1080                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1081                                 return -1;
1082                 } else if (cmd->unsolicited_data) {
1083                         iscsit_set_dataout_sequence_values(cmd);
1084
1085                         spin_lock_bh(&cmd->dataout_timeout_lock);
1086                         iscsit_start_dataout_timer(cmd, cmd->conn);
1087                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1088                 }
1089
1090                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1091                         return iscsit_add_reject_from_cmd(
1092                                 ISCSI_REASON_PROTOCOL_ERROR,
1093                                 1, 0, buf, cmd);
1094
1095         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1096                 /*
1097                  * Immediate Data failed DataCRC and ERL>=1,
1098                  * silently drop this PDU and let the initiator
1099                  * plug the CmdSN gap.
1100                  *
1101                  * FIXME: Send Unsolicited NOPIN with reserved
1102                  * TTT here to help the initiator figure out
1103                  * the missing CmdSN, although they should be
1104                  * intelligent enough to determine the missing
1105                  * CmdSN and issue a retry to plug the sequence.
1106                  */
1107                 cmd->i_state = ISTATE_REMOVE;
1108                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1109         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1110                 return -1;
1111
1112         return 0;
1113 }
1114
1115 static u32 iscsit_do_crypto_hash_sg(
1116         struct hash_desc *hash,
1117         struct iscsi_cmd *cmd,
1118         u32 data_offset,
1119         u32 data_length,
1120         u32 padding,
1121         u8 *pad_bytes)
1122 {
1123         u32 data_crc;
1124         u32 i;
1125         struct scatterlist *sg;
1126         unsigned int page_off;
1127
1128         crypto_hash_init(hash);
1129
1130         sg = cmd->first_data_sg;
1131         page_off = cmd->first_data_sg_off;
1132
1133         i = 0;
1134         while (data_length) {
1135                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1136
1137                 crypto_hash_update(hash, &sg[i], cur_len);
1138
1139                 data_length -= cur_len;
1140                 page_off = 0;
1141                 i++;
1142         }
1143
1144         if (padding) {
1145                 struct scatterlist pad_sg;
1146
1147                 sg_init_one(&pad_sg, pad_bytes, padding);
1148                 crypto_hash_update(hash, &pad_sg, padding);
1149         }
1150         crypto_hash_final(hash, (u8 *) &data_crc);
1151
1152         return data_crc;
1153 }
1154
1155 static void iscsit_do_crypto_hash_buf(
1156         struct hash_desc *hash,
1157         unsigned char *buf,
1158         u32 payload_length,
1159         u32 padding,
1160         u8 *pad_bytes,
1161         u8 *data_crc)
1162 {
1163         struct scatterlist sg;
1164
1165         crypto_hash_init(hash);
1166
1167         sg_init_one(&sg, buf, payload_length);
1168         crypto_hash_update(hash, &sg, payload_length);
1169
1170         if (padding) {
1171                 sg_init_one(&sg, pad_bytes, padding);
1172                 crypto_hash_update(hash, &sg, padding);
1173         }
1174         crypto_hash_final(hash, data_crc);
1175 }
1176
1177 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1178 {
1179         int iov_ret, ooo_cmdsn = 0, ret;
1180         u8 data_crc_failed = 0;
1181         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1182         u32 rx_size = 0, payload_length;
1183         struct iscsi_cmd *cmd = NULL;
1184         struct se_cmd *se_cmd;
1185         struct iscsi_data *hdr;
1186         struct kvec *iov;
1187         unsigned long flags;
1188
1189         hdr                     = (struct iscsi_data *) buf;
1190         payload_length          = ntoh24(hdr->dlength);
1191
1192         if (!payload_length) {
1193                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1194                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1195                                         buf, conn);
1196         }
1197
1198         /* iSCSI write */
1199         spin_lock_bh(&conn->sess->session_stats_lock);
1200         conn->sess->rx_data_octets += payload_length;
1201         if (conn->sess->se_sess->se_node_acl) {
1202                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1203                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1204                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1205         }
1206         spin_unlock_bh(&conn->sess->session_stats_lock);
1207
1208         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1209                 pr_err("DataSegmentLength: %u is greater than"
1210                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1211                         conn->conn_ops->MaxXmitDataSegmentLength);
1212                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1213                                         buf, conn);
1214         }
1215
1216         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1217                         payload_length);
1218         if (!cmd)
1219                 return 0;
1220
1221         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1222                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1223                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1224                 payload_length, conn->cid);
1225
1226         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1227                 pr_err("Command ITT: 0x%08x received DataOUT after"
1228                         " last DataOUT received, dumping payload\n",
1229                         cmd->init_task_tag);
1230                 return iscsit_dump_data_payload(conn, payload_length, 1);
1231         }
1232
1233         if (cmd->data_direction != DMA_TO_DEVICE) {
1234                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1235                         " NON-WRITE command.\n", cmd->init_task_tag);
1236                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1237                                 1, 0, buf, cmd);
1238         }
1239         se_cmd = &cmd->se_cmd;
1240         iscsit_mod_dataout_timer(cmd);
1241
1242         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1243                 pr_err("DataOut Offset: %u, Length %u greater than"
1244                         " iSCSI Command EDTL %u, protocol error.\n",
1245                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1246                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1247                                 1, 0, buf, cmd);
1248         }
1249
1250         if (cmd->unsolicited_data) {
1251                 int dump_unsolicited_data = 0;
1252
1253                 if (conn->sess->sess_ops->InitialR2T) {
1254                         pr_err("Received unexpected unsolicited data"
1255                                 " while InitialR2T=Yes, protocol error.\n");
1256                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1257                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1258                         return -1;
1259                 }
1260                 /*
1261                  * Special case for dealing with Unsolicited DataOUT
1262                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1263                  * failures;
1264                  */
1265
1266                 /* Something's amiss if we're not in WRITE_PENDING state... */
1267                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1268                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1269                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1270
1271                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1272                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1273                         dump_unsolicited_data = 1;
1274                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1275
1276                 if (dump_unsolicited_data) {
1277                         /*
1278                          * Check if a delayed TASK_ABORTED status needs to
1279                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1280                          * received with the unsolicitied data out.
1281                          */
1282                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1283                                 iscsit_stop_dataout_timer(cmd);
1284
1285                         transport_check_aborted_status(se_cmd,
1286                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1287                         return iscsit_dump_data_payload(conn, payload_length, 1);
1288                 }
1289         } else {
1290                 /*
1291                  * For the normal solicited data path:
1292                  *
1293                  * Check for a delayed TASK_ABORTED status and dump any
1294                  * incoming data out payload if one exists.  Also, when the
1295                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1296                  * data out sequence, we decrement outstanding_r2ts.  Once
1297                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1298                  * TASK_ABORTED status.
1299                  */
1300                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1301                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1302                                 if (--cmd->outstanding_r2ts < 1) {
1303                                         iscsit_stop_dataout_timer(cmd);
1304                                         transport_check_aborted_status(
1305                                                         se_cmd, 1);
1306                                 }
1307
1308                         return iscsit_dump_data_payload(conn, payload_length, 1);
1309                 }
1310         }
1311         /*
1312          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1313          * within-command recovery checks before receiving the payload.
1314          */
1315         ret = iscsit_check_pre_dataout(cmd, buf);
1316         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1317                 return 0;
1318         else if (ret == DATAOUT_CANNOT_RECOVER)
1319                 return -1;
1320
1321         rx_size += payload_length;
1322         iov = &cmd->iov_data[0];
1323
1324         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1325                                    payload_length);
1326         if (iov_ret < 0)
1327                 return -1;
1328
1329         iov_count += iov_ret;
1330
1331         padding = ((-payload_length) & 3);
1332         if (padding != 0) {
1333                 iov[iov_count].iov_base = cmd->pad_bytes;
1334                 iov[iov_count++].iov_len = padding;
1335                 rx_size += padding;
1336                 pr_debug("Receiving %u padding bytes.\n", padding);
1337         }
1338
1339         if (conn->conn_ops->DataDigest) {
1340                 iov[iov_count].iov_base = &checksum;
1341                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1342                 rx_size += ISCSI_CRC_LEN;
1343         }
1344
1345         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1346
1347         iscsit_unmap_iovec(cmd);
1348
1349         if (rx_got != rx_size)
1350                 return -1;
1351
1352         if (conn->conn_ops->DataDigest) {
1353                 u32 data_crc;
1354
1355                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1356                                                     be32_to_cpu(hdr->offset),
1357                                                     payload_length, padding,
1358                                                     cmd->pad_bytes);
1359
1360                 if (checksum != data_crc) {
1361                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1362                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1363                                 " does not match computed 0x%08x\n",
1364                                 hdr->itt, hdr->offset, payload_length,
1365                                 hdr->datasn, checksum, data_crc);
1366                         data_crc_failed = 1;
1367                 } else {
1368                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1369                                 " %u bytes of Data Out\n", checksum,
1370                                 payload_length);
1371                 }
1372         }
1373         /*
1374          * Increment post receive data and CRC values or perform
1375          * within-command recovery.
1376          */
1377         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1378         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1379                 return 0;
1380         else if (ret == DATAOUT_SEND_R2T) {
1381                 iscsit_set_dataout_sequence_values(cmd);
1382                 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1383         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1384                 /*
1385                  * Handle extra special case for out of order
1386                  * Unsolicited Data Out.
1387                  */
1388                 spin_lock_bh(&cmd->istate_lock);
1389                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1390                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1391                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1392                 spin_unlock_bh(&cmd->istate_lock);
1393
1394                 iscsit_stop_dataout_timer(cmd);
1395                 if (ooo_cmdsn)
1396                         return 0;
1397                 target_execute_cmd(&cmd->se_cmd);
1398                 return 0;
1399         } else /* DATAOUT_CANNOT_RECOVER */
1400                 return -1;
1401
1402         return 0;
1403 }
1404
1405 static int iscsit_handle_nop_out(
1406         struct iscsi_conn *conn,
1407         unsigned char *buf)
1408 {
1409         unsigned char *ping_data = NULL;
1410         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1411         u32 checksum, data_crc, padding = 0, payload_length;
1412         struct iscsi_cmd *cmd = NULL;
1413         struct kvec *iov = NULL;
1414         struct iscsi_nopout *hdr;
1415
1416         hdr                     = (struct iscsi_nopout *) buf;
1417         payload_length          = ntoh24(hdr->dlength);
1418
1419         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1420                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1421                         " not set, protocol error.\n");
1422                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1423                                         buf, conn);
1424         }
1425
1426         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1427                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1428                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1429                         " error.\n", payload_length,
1430                         conn->conn_ops->MaxXmitDataSegmentLength);
1431                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1432                                         buf, conn);
1433         }
1434
1435         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1436                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1437                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1438                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1439                 payload_length);
1440         /*
1441          * This is not a response to a Unsolicited NopIN, which means
1442          * it can either be a NOPOUT ping request (with a valid ITT),
1443          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1444          * Either way, make sure we allocate an struct iscsi_cmd, as both
1445          * can contain ping data.
1446          */
1447         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1448                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1449                 if (!cmd)
1450                         return iscsit_add_reject(
1451                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1452                                         1, buf, conn);
1453
1454                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1455                 cmd->i_state            = ISTATE_SEND_NOPIN;
1456                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1457                                                 1 : 0);
1458                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1459                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1460                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1461                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1462                 cmd->data_direction     = DMA_NONE;
1463         }
1464
1465         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1466                 rx_size = payload_length;
1467                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1468                 if (!ping_data) {
1469                         pr_err("Unable to allocate memory for"
1470                                 " NOPOUT ping data.\n");
1471                         ret = -1;
1472                         goto out;
1473                 }
1474
1475                 iov = &cmd->iov_misc[0];
1476                 iov[niov].iov_base      = ping_data;
1477                 iov[niov++].iov_len     = payload_length;
1478
1479                 padding = ((-payload_length) & 3);
1480                 if (padding != 0) {
1481                         pr_debug("Receiving %u additional bytes"
1482                                 " for padding.\n", padding);
1483                         iov[niov].iov_base      = &cmd->pad_bytes;
1484                         iov[niov++].iov_len     = padding;
1485                         rx_size += padding;
1486                 }
1487                 if (conn->conn_ops->DataDigest) {
1488                         iov[niov].iov_base      = &checksum;
1489                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1490                         rx_size += ISCSI_CRC_LEN;
1491                 }
1492
1493                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1494                 if (rx_got != rx_size) {
1495                         ret = -1;
1496                         goto out;
1497                 }
1498
1499                 if (conn->conn_ops->DataDigest) {
1500                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1501                                         ping_data, payload_length,
1502                                         padding, cmd->pad_bytes,
1503                                         (u8 *)&data_crc);
1504
1505                         if (checksum != data_crc) {
1506                                 pr_err("Ping data CRC32C DataDigest"
1507                                 " 0x%08x does not match computed 0x%08x\n",
1508                                         checksum, data_crc);
1509                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1510                                         pr_err("Unable to recover from"
1511                                         " NOPOUT Ping DataCRC failure while in"
1512                                                 " ERL=0.\n");
1513                                         ret = -1;
1514                                         goto out;
1515                                 } else {
1516                                         /*
1517                                          * Silently drop this PDU and let the
1518                                          * initiator plug the CmdSN gap.
1519                                          */
1520                                         pr_debug("Dropping NOPOUT"
1521                                         " Command CmdSN: 0x%08x due to"
1522                                         " DataCRC error.\n", hdr->cmdsn);
1523                                         ret = 0;
1524                                         goto out;
1525                                 }
1526                         } else {
1527                                 pr_debug("Got CRC32C DataDigest"
1528                                 " 0x%08x for %u bytes of ping data.\n",
1529                                         checksum, payload_length);
1530                         }
1531                 }
1532
1533                 ping_data[payload_length] = '\0';
1534                 /*
1535                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1536                  */
1537                 cmd->buf_ptr = ping_data;
1538                 cmd->buf_ptr_size = payload_length;
1539
1540                 pr_debug("Got %u bytes of NOPOUT ping"
1541                         " data.\n", payload_length);
1542                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1543         }
1544
1545         if (hdr->itt != RESERVED_ITT) {
1546                 if (!cmd) {
1547                         pr_err("Checking CmdSN for NOPOUT,"
1548                                 " but cmd is NULL!\n");
1549                         return -1;
1550                 }
1551                 /*
1552                  * Initiator is expecting a NopIN ping reply,
1553                  */
1554                 spin_lock_bh(&conn->cmd_lock);
1555                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1556                 spin_unlock_bh(&conn->cmd_lock);
1557
1558                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1559
1560                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1561                         iscsit_add_cmd_to_response_queue(cmd, conn,
1562                                         cmd->i_state);
1563                         return 0;
1564                 }
1565
1566                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1567                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1568                         ret = 0;
1569                         goto ping_out;
1570                 }
1571                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1572                         return iscsit_add_reject_from_cmd(
1573                                         ISCSI_REASON_PROTOCOL_ERROR,
1574                                         1, 0, buf, cmd);
1575
1576                 return 0;
1577         }
1578
1579         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1580                 /*
1581                  * This was a response to a unsolicited NOPIN ping.
1582                  */
1583                 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1584                 if (!cmd)
1585                         return -1;
1586
1587                 iscsit_stop_nopin_response_timer(conn);
1588
1589                 cmd->i_state = ISTATE_REMOVE;
1590                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1591                 iscsit_start_nopin_timer(conn);
1592         } else {
1593                 /*
1594                  * Initiator is not expecting a NOPIN is response.
1595                  * Just ignore for now.
1596                  *
1597                  * iSCSI v19-91 10.18
1598                  * "A NOP-OUT may also be used to confirm a changed
1599                  *  ExpStatSN if another PDU will not be available
1600                  *  for a long time."
1601                  */
1602                 ret = 0;
1603                 goto out;
1604         }
1605
1606         return 0;
1607 out:
1608         if (cmd)
1609                 iscsit_release_cmd(cmd);
1610 ping_out:
1611         kfree(ping_data);
1612         return ret;
1613 }
1614
1615 static int iscsit_handle_task_mgt_cmd(
1616         struct iscsi_conn *conn,
1617         unsigned char *buf)
1618 {
1619         struct iscsi_cmd *cmd;
1620         struct se_tmr_req *se_tmr;
1621         struct iscsi_tmr_req *tmr_req;
1622         struct iscsi_tm *hdr;
1623         int out_of_order_cmdsn = 0;
1624         int ret;
1625         u8 function;
1626
1627         hdr                     = (struct iscsi_tm *) buf;
1628         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1629         function = hdr->flags;
1630
1631         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1632                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1633                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1634                 hdr->rtt, hdr->refcmdsn, conn->cid);
1635
1636         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1637             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1638              hdr->rtt != RESERVED_ITT)) {
1639                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1640                 hdr->rtt = RESERVED_ITT;
1641         }
1642
1643         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1644                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1645                 pr_err("Task Management Request TASK_REASSIGN not"
1646                         " issued as immediate command, bad iSCSI Initiator"
1647                                 "implementation\n");
1648                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1649                                         buf, conn);
1650         }
1651         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1652             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1653                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1654
1655         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1656         if (!cmd)
1657                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1658                                          1, buf, conn);
1659
1660         cmd->data_direction = DMA_NONE;
1661
1662         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1663         if (!cmd->tmr_req) {
1664                 pr_err("Unable to allocate memory for"
1665                         " Task Management command!\n");
1666                 return iscsit_add_reject_from_cmd(
1667                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1668                         1, 1, buf, cmd);
1669         }
1670
1671         /*
1672          * TASK_REASSIGN for ERL=2 / connection stays inside of
1673          * LIO-Target $FABRIC_MOD
1674          */
1675         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1676
1677                 u8 tcm_function;
1678                 int ret;
1679
1680                 transport_init_se_cmd(&cmd->se_cmd,
1681                                       &lio_target_fabric_configfs->tf_ops,
1682                                       conn->sess->se_sess, 0, DMA_NONE,
1683                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1684
1685                 switch (function) {
1686                 case ISCSI_TM_FUNC_ABORT_TASK:
1687                         tcm_function = TMR_ABORT_TASK;
1688                         break;
1689                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1690                         tcm_function = TMR_ABORT_TASK_SET;
1691                         break;
1692                 case ISCSI_TM_FUNC_CLEAR_ACA:
1693                         tcm_function = TMR_CLEAR_ACA;
1694                         break;
1695                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1696                         tcm_function = TMR_CLEAR_TASK_SET;
1697                         break;
1698                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1699                         tcm_function = TMR_LUN_RESET;
1700                         break;
1701                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1702                         tcm_function = TMR_TARGET_WARM_RESET;
1703                         break;
1704                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1705                         tcm_function = TMR_TARGET_COLD_RESET;
1706                         break;
1707                 default:
1708                         pr_err("Unknown iSCSI TMR Function:"
1709                                " 0x%02x\n", function);
1710                         return iscsit_add_reject_from_cmd(
1711                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1712                                 1, 1, buf, cmd);
1713                 }
1714
1715                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1716                                          tcm_function, GFP_KERNEL);
1717                 if (ret < 0)
1718                         return iscsit_add_reject_from_cmd(
1719                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1720                                 1, 1, buf, cmd);
1721
1722                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1723         }
1724
1725         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1726         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1727         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1728         cmd->init_task_tag      = hdr->itt;
1729         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1730         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1731         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1732         se_tmr                  = cmd->se_cmd.se_tmr_req;
1733         tmr_req                 = cmd->tmr_req;
1734         /*
1735          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1736          */
1737         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1738                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1739                                                scsilun_to_int(&hdr->lun));
1740                 if (ret < 0) {
1741                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1742                         goto attach;
1743                 }
1744         }
1745
1746         switch (function) {
1747         case ISCSI_TM_FUNC_ABORT_TASK:
1748                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1749                 if (se_tmr->response)
1750                         goto attach;
1751                 break;
1752         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1753         case ISCSI_TM_FUNC_CLEAR_ACA:
1754         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1755         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1756                 break;
1757         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1758                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1759                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1760                         goto attach;
1761                 }
1762                 break;
1763         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1764                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1765                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1766                         goto attach;
1767                 }
1768                 break;
1769         case ISCSI_TM_FUNC_TASK_REASSIGN:
1770                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1771                 /*
1772                  * Perform sanity checks on the ExpDataSN only if the
1773                  * TASK_REASSIGN was successful.
1774                  */
1775                 if (se_tmr->response)
1776                         break;
1777
1778                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1779                         return iscsit_add_reject_from_cmd(
1780                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1781                                         buf, cmd);
1782                 break;
1783         default:
1784                 pr_err("Unknown TMR function: 0x%02x, protocol"
1785                         " error.\n", function);
1786                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1787                 goto attach;
1788         }
1789
1790         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1791             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1792                 se_tmr->call_transport = 1;
1793 attach:
1794         spin_lock_bh(&conn->cmd_lock);
1795         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1796         spin_unlock_bh(&conn->cmd_lock);
1797
1798         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1799                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1800                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1801                         out_of_order_cmdsn = 1;
1802                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1803                         return 0;
1804                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1805                         return iscsit_add_reject_from_cmd(
1806                                         ISCSI_REASON_PROTOCOL_ERROR,
1807                                         1, 0, buf, cmd);
1808         }
1809         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1810
1811         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1812                 return 0;
1813         /*
1814          * Found the referenced task, send to transport for processing.
1815          */
1816         if (se_tmr->call_transport)
1817                 return transport_generic_handle_tmr(&cmd->se_cmd);
1818
1819         /*
1820          * Could not find the referenced LUN, task, or Task Management
1821          * command not authorized or supported.  Change state and
1822          * let the tx_thread send the response.
1823          *
1824          * For connection recovery, this is also the default action for
1825          * TMR TASK_REASSIGN.
1826          */
1827         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1828         return 0;
1829 }
1830
1831 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1832 static int iscsit_handle_text_cmd(
1833         struct iscsi_conn *conn,
1834         unsigned char *buf)
1835 {
1836         char *text_ptr, *text_in;
1837         int cmdsn_ret, niov = 0, rx_got, rx_size;
1838         u32 checksum = 0, data_crc = 0, payload_length;
1839         u32 padding = 0, pad_bytes = 0, text_length = 0;
1840         struct iscsi_cmd *cmd;
1841         struct kvec iov[3];
1842         struct iscsi_text *hdr;
1843
1844         hdr                     = (struct iscsi_text *) buf;
1845         payload_length          = ntoh24(hdr->dlength);
1846
1847         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1848                 pr_err("Unable to accept text parameter length: %u"
1849                         "greater than MaxXmitDataSegmentLength %u.\n",
1850                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1851                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1852                                         buf, conn);
1853         }
1854
1855         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1856                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1857                 hdr->exp_statsn, payload_length);
1858
1859         rx_size = text_length = payload_length;
1860         if (text_length) {
1861                 text_in = kzalloc(text_length, GFP_KERNEL);
1862                 if (!text_in) {
1863                         pr_err("Unable to allocate memory for"
1864                                 " incoming text parameters\n");
1865                         return -1;
1866                 }
1867
1868                 memset(iov, 0, 3 * sizeof(struct kvec));
1869                 iov[niov].iov_base      = text_in;
1870                 iov[niov++].iov_len     = text_length;
1871
1872                 padding = ((-payload_length) & 3);
1873                 if (padding != 0) {
1874                         iov[niov].iov_base = &pad_bytes;
1875                         iov[niov++].iov_len  = padding;
1876                         rx_size += padding;
1877                         pr_debug("Receiving %u additional bytes"
1878                                         " for padding.\n", padding);
1879                 }
1880                 if (conn->conn_ops->DataDigest) {
1881                         iov[niov].iov_base      = &checksum;
1882                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1883                         rx_size += ISCSI_CRC_LEN;
1884                 }
1885
1886                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1887                 if (rx_got != rx_size) {
1888                         kfree(text_in);
1889                         return -1;
1890                 }
1891
1892                 if (conn->conn_ops->DataDigest) {
1893                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1894                                         text_in, text_length,
1895                                         padding, (u8 *)&pad_bytes,
1896                                         (u8 *)&data_crc);
1897
1898                         if (checksum != data_crc) {
1899                                 pr_err("Text data CRC32C DataDigest"
1900                                         " 0x%08x does not match computed"
1901                                         " 0x%08x\n", checksum, data_crc);
1902                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1903                                         pr_err("Unable to recover from"
1904                                         " Text Data digest failure while in"
1905                                                 " ERL=0.\n");
1906                                         kfree(text_in);
1907                                         return -1;
1908                                 } else {
1909                                         /*
1910                                          * Silently drop this PDU and let the
1911                                          * initiator plug the CmdSN gap.
1912                                          */
1913                                         pr_debug("Dropping Text"
1914                                         " Command CmdSN: 0x%08x due to"
1915                                         " DataCRC error.\n", hdr->cmdsn);
1916                                         kfree(text_in);
1917                                         return 0;
1918                                 }
1919                         } else {
1920                                 pr_debug("Got CRC32C DataDigest"
1921                                         " 0x%08x for %u bytes of text data.\n",
1922                                                 checksum, text_length);
1923                         }
1924                 }
1925                 text_in[text_length - 1] = '\0';
1926                 pr_debug("Successfully read %d bytes of text"
1927                                 " data.\n", text_length);
1928
1929                 if (strncmp("SendTargets", text_in, 11) != 0) {
1930                         pr_err("Received Text Data that is not"
1931                                 " SendTargets, cannot continue.\n");
1932                         kfree(text_in);
1933                         return -1;
1934                 }
1935                 text_ptr = strchr(text_in, '=');
1936                 if (!text_ptr) {
1937                         pr_err("No \"=\" separator found in Text Data,"
1938                                 "  cannot continue.\n");
1939                         kfree(text_in);
1940                         return -1;
1941                 }
1942                 if (strncmp("=All", text_ptr, 4) != 0) {
1943                         pr_err("Unable to locate All value for"
1944                                 " SendTargets key,  cannot continue.\n");
1945                         kfree(text_in);
1946                         return -1;
1947                 }
1948 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1949                 kfree(text_in);
1950         }
1951
1952         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1953         if (!cmd)
1954                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1955                                         1, buf, conn);
1956
1957         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1958         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1959         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1960         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1961         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1962         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1963         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1964         cmd->data_direction     = DMA_NONE;
1965
1966         spin_lock_bh(&conn->cmd_lock);
1967         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1968         spin_unlock_bh(&conn->cmd_lock);
1969
1970         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1971
1972         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1973                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1974                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1975                         return iscsit_add_reject_from_cmd(
1976                                         ISCSI_REASON_PROTOCOL_ERROR,
1977                                         1, 0, buf, cmd);
1978
1979                 return 0;
1980         }
1981
1982         return iscsit_execute_cmd(cmd, 0);
1983 }
1984
1985 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1986 {
1987         struct iscsi_conn *conn_p;
1988         struct iscsi_session *sess = conn->sess;
1989
1990         pr_debug("Received logout request CLOSESESSION on CID: %hu"
1991                 " for SID: %u.\n", conn->cid, conn->sess->sid);
1992
1993         atomic_set(&sess->session_logout, 1);
1994         atomic_set(&conn->conn_logout_remove, 1);
1995         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
1996
1997         iscsit_inc_conn_usage_count(conn);
1998         iscsit_inc_session_usage_count(sess);
1999
2000         spin_lock_bh(&sess->conn_lock);
2001         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2002                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2003                         continue;
2004
2005                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2006                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2007         }
2008         spin_unlock_bh(&sess->conn_lock);
2009
2010         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2011
2012         return 0;
2013 }
2014
2015 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2016 {
2017         struct iscsi_conn *l_conn;
2018         struct iscsi_session *sess = conn->sess;
2019
2020         pr_debug("Received logout request CLOSECONNECTION for CID:"
2021                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2022
2023         /*
2024          * A Logout Request with a CLOSECONNECTION reason code for a CID
2025          * can arrive on a connection with a differing CID.
2026          */
2027         if (conn->cid == cmd->logout_cid) {
2028                 spin_lock_bh(&conn->state_lock);
2029                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2030                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2031
2032                 atomic_set(&conn->conn_logout_remove, 1);
2033                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2034                 iscsit_inc_conn_usage_count(conn);
2035
2036                 spin_unlock_bh(&conn->state_lock);
2037         } else {
2038                 /*
2039                  * Handle all different cid CLOSECONNECTION requests in
2040                  * iscsit_logout_post_handler_diffcid() as to give enough
2041                  * time for any non immediate command's CmdSN to be
2042                  * acknowledged on the connection in question.
2043                  *
2044                  * Here we simply make sure the CID is still around.
2045                  */
2046                 l_conn = iscsit_get_conn_from_cid(sess,
2047                                 cmd->logout_cid);
2048                 if (!l_conn) {
2049                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2050                         iscsit_add_cmd_to_response_queue(cmd, conn,
2051                                         cmd->i_state);
2052                         return 0;
2053                 }
2054
2055                 iscsit_dec_conn_usage_count(l_conn);
2056         }
2057
2058         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2059
2060         return 0;
2061 }
2062
2063 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2064 {
2065         struct iscsi_session *sess = conn->sess;
2066
2067         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2068                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2069
2070         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2071                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2072                         " while ERL!=2.\n");
2073                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2074                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2075                 return 0;
2076         }
2077
2078         if (conn->cid == cmd->logout_cid) {
2079                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2080                         " with CID: %hu on CID: %hu, implementation error.\n",
2081                                 cmd->logout_cid, conn->cid);
2082                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2083                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2084                 return 0;
2085         }
2086
2087         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2088
2089         return 0;
2090 }
2091
2092 static int iscsit_handle_logout_cmd(
2093         struct iscsi_conn *conn,
2094         unsigned char *buf)
2095 {
2096         int cmdsn_ret, logout_remove = 0;
2097         u8 reason_code = 0;
2098         struct iscsi_cmd *cmd;
2099         struct iscsi_logout *hdr;
2100         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2101
2102         hdr                     = (struct iscsi_logout *) buf;
2103         reason_code             = (hdr->flags & 0x7f);
2104
2105         if (tiqn) {
2106                 spin_lock(&tiqn->logout_stats.lock);
2107                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2108                         tiqn->logout_stats.normal_logouts++;
2109                 else
2110                         tiqn->logout_stats.abnormal_logouts++;
2111                 spin_unlock(&tiqn->logout_stats.lock);
2112         }
2113
2114         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2115                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2116                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2117                 hdr->cid, conn->cid);
2118
2119         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2120                 pr_err("Received logout request on connection that"
2121                         " is not in logged in state, ignoring request.\n");
2122                 return 0;
2123         }
2124
2125         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2126         if (!cmd)
2127                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2128                                         buf, conn);
2129
2130         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2131         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2132         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2133         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2134         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2135         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2136         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2137         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2138         cmd->logout_reason      = reason_code;
2139         cmd->data_direction     = DMA_NONE;
2140
2141         /*
2142          * We need to sleep in these cases (by returning 1) until the Logout
2143          * Response gets sent in the tx thread.
2144          */
2145         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2146            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2147             be16_to_cpu(hdr->cid) == conn->cid))
2148                 logout_remove = 1;
2149
2150         spin_lock_bh(&conn->cmd_lock);
2151         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2152         spin_unlock_bh(&conn->cmd_lock);
2153
2154         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2155                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2156
2157         /*
2158          * Immediate commands are executed, well, immediately.
2159          * Non-Immediate Logout Commands are executed in CmdSN order.
2160          */
2161         if (cmd->immediate_cmd) {
2162                 int ret = iscsit_execute_cmd(cmd, 0);
2163
2164                 if (ret < 0)
2165                         return ret;
2166         } else {
2167                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2168                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2169                         logout_remove = 0;
2170                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2171                         return iscsit_add_reject_from_cmd(
2172                                 ISCSI_REASON_PROTOCOL_ERROR,
2173                                 1, 0, buf, cmd);
2174                 }
2175         }
2176
2177         return logout_remove;
2178 }
2179
2180 static int iscsit_handle_snack(
2181         struct iscsi_conn *conn,
2182         unsigned char *buf)
2183 {
2184         struct iscsi_snack *hdr;
2185
2186         hdr                     = (struct iscsi_snack *) buf;
2187         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2188
2189         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2190                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2191                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2192                         hdr->begrun, hdr->runlength, conn->cid);
2193
2194         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2195                 pr_err("Initiator sent SNACK request while in"
2196                         " ErrorRecoveryLevel=0.\n");
2197                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2198                                         buf, conn);
2199         }
2200         /*
2201          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2202          * call from inside iscsi_send_recovery_datain_or_r2t().
2203          */
2204         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2205         case 0:
2206                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2207                         hdr->itt,
2208                         be32_to_cpu(hdr->ttt),
2209                         be32_to_cpu(hdr->begrun),
2210                         be32_to_cpu(hdr->runlength));
2211         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2212                 return iscsit_handle_status_snack(conn, hdr->itt,
2213                         be32_to_cpu(hdr->ttt),
2214                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2215         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2216                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2217                         be32_to_cpu(hdr->begrun),
2218                         be32_to_cpu(hdr->runlength));
2219         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2220                 /* FIXME: Support R-Data SNACK */
2221                 pr_err("R-Data SNACK Not Supported.\n");
2222                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2223                                         buf, conn);
2224         default:
2225                 pr_err("Unknown SNACK type 0x%02x, protocol"
2226                         " error.\n", hdr->flags & 0x0f);
2227                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2228                                         buf, conn);
2229         }
2230
2231         return 0;
2232 }
2233
2234 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2235 {
2236         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2237             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2238                 wait_for_completion_interruptible_timeout(
2239                                         &conn->rx_half_close_comp,
2240                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2241         }
2242 }
2243
2244 static int iscsit_handle_immediate_data(
2245         struct iscsi_cmd *cmd,
2246         unsigned char *buf,
2247         u32 length)
2248 {
2249         int iov_ret, rx_got = 0, rx_size = 0;
2250         u32 checksum, iov_count = 0, padding = 0;
2251         struct iscsi_conn *conn = cmd->conn;
2252         struct kvec *iov;
2253
2254         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2255         if (iov_ret < 0)
2256                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2257
2258         rx_size = length;
2259         iov_count = iov_ret;
2260         iov = &cmd->iov_data[0];
2261
2262         padding = ((-length) & 3);
2263         if (padding != 0) {
2264                 iov[iov_count].iov_base = cmd->pad_bytes;
2265                 iov[iov_count++].iov_len = padding;
2266                 rx_size += padding;
2267         }
2268
2269         if (conn->conn_ops->DataDigest) {
2270                 iov[iov_count].iov_base         = &checksum;
2271                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2272                 rx_size += ISCSI_CRC_LEN;
2273         }
2274
2275         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2276
2277         iscsit_unmap_iovec(cmd);
2278
2279         if (rx_got != rx_size) {
2280                 iscsit_rx_thread_wait_for_tcp(conn);
2281                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2282         }
2283
2284         if (conn->conn_ops->DataDigest) {
2285                 u32 data_crc;
2286
2287                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2288                                                     cmd->write_data_done, length, padding,
2289                                                     cmd->pad_bytes);
2290
2291                 if (checksum != data_crc) {
2292                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2293                                 " does not match computed 0x%08x\n", checksum,
2294                                 data_crc);
2295
2296                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2297                                 pr_err("Unable to recover from"
2298                                         " Immediate Data digest failure while"
2299                                         " in ERL=0.\n");
2300                                 iscsit_add_reject_from_cmd(
2301                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2302                                                 1, 0, buf, cmd);
2303                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2304                         } else {
2305                                 iscsit_add_reject_from_cmd(
2306                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2307                                                 0, 0, buf, cmd);
2308                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2309                         }
2310                 } else {
2311                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2312                                 " %u bytes of Immediate Data\n", checksum,
2313                                 length);
2314                 }
2315         }
2316
2317         cmd->write_data_done += length;
2318
2319         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2320                 spin_lock_bh(&cmd->istate_lock);
2321                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2322                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2323                 spin_unlock_bh(&cmd->istate_lock);
2324         }
2325
2326         return IMMEDIATE_DATA_NORMAL_OPERATION;
2327 }
2328
2329 /*
2330  *      Called with sess->conn_lock held.
2331  */
2332 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2333         with active network interface */
2334 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2335 {
2336         struct iscsi_cmd *cmd;
2337         struct iscsi_conn *conn_p;
2338
2339         /*
2340          * Only send a Asynchronous Message on connections whos network
2341          * interface is still functional.
2342          */
2343         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2344                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2345                         iscsit_inc_conn_usage_count(conn_p);
2346                         break;
2347                 }
2348         }
2349
2350         if (!conn_p)
2351                 return;
2352
2353         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2354         if (!cmd) {
2355                 iscsit_dec_conn_usage_count(conn_p);
2356                 return;
2357         }
2358
2359         cmd->logout_cid = conn->cid;
2360         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2361         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2362
2363         spin_lock_bh(&conn_p->cmd_lock);
2364         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2365         spin_unlock_bh(&conn_p->cmd_lock);
2366
2367         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2368         iscsit_dec_conn_usage_count(conn_p);
2369 }
2370
2371 static int iscsit_send_conn_drop_async_message(
2372         struct iscsi_cmd *cmd,
2373         struct iscsi_conn *conn)
2374 {
2375         struct iscsi_async *hdr;
2376
2377         cmd->tx_size = ISCSI_HDR_LEN;
2378         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2379
2380         hdr                     = (struct iscsi_async *) cmd->pdu;
2381         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2382         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2383         cmd->init_task_tag      = RESERVED_ITT;
2384         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2385         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2386         cmd->stat_sn            = conn->stat_sn++;
2387         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2388         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2389         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2390         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2391         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2392         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2393         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2394
2395         if (conn->conn_ops->HeaderDigest) {
2396                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2397
2398                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2399                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2400                                 0, NULL, (u8 *)header_digest);
2401
2402                 cmd->tx_size += ISCSI_CRC_LEN;
2403                 pr_debug("Attaching CRC32C HeaderDigest to"
2404                         " Async Message 0x%08x\n", *header_digest);
2405         }
2406
2407         cmd->iov_misc[0].iov_base       = cmd->pdu;
2408         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2409         cmd->iov_misc_count             = 1;
2410
2411         pr_debug("Sending Connection Dropped Async Message StatSN:"
2412                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2413                         cmd->logout_cid, conn->cid);
2414         return 0;
2415 }
2416
2417 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2418 {
2419         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2420             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2421                 wait_for_completion_interruptible_timeout(
2422                                         &conn->tx_half_close_comp,
2423                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2424         }
2425 }
2426
2427 static int iscsit_send_data_in(
2428         struct iscsi_cmd *cmd,
2429         struct iscsi_conn *conn)
2430 {
2431         int iov_ret = 0, set_statsn = 0;
2432         u32 iov_count = 0, tx_size = 0;
2433         struct iscsi_datain datain;
2434         struct iscsi_datain_req *dr;
2435         struct iscsi_data_rsp *hdr;
2436         struct kvec *iov;
2437         int eodr = 0;
2438         int ret;
2439
2440         memset(&datain, 0, sizeof(struct iscsi_datain));
2441         dr = iscsit_get_datain_values(cmd, &datain);
2442         if (!dr) {
2443                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2444                                 cmd->init_task_tag);
2445                 return -1;
2446         }
2447
2448         /*
2449          * Be paranoid and double check the logic for now.
2450          */
2451         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2452                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2453                         " datain.length: %u exceeds cmd->data_length: %u\n",
2454                         cmd->init_task_tag, datain.offset, datain.length,
2455                                 cmd->se_cmd.data_length);
2456                 return -1;
2457         }
2458
2459         spin_lock_bh(&conn->sess->session_stats_lock);
2460         conn->sess->tx_data_octets += datain.length;
2461         if (conn->sess->se_sess->se_node_acl) {
2462                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2463                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2464                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2465         }
2466         spin_unlock_bh(&conn->sess->session_stats_lock);
2467         /*
2468          * Special case for successfully execution w/ both DATAIN
2469          * and Sense Data.
2470          */
2471         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2472             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2473                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2474         else {
2475                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2476                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2477                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2478                         cmd->stat_sn = conn->stat_sn++;
2479                         set_statsn = 1;
2480                 } else if (dr->dr_complete ==
2481                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2482                         set_statsn = 1;
2483         }
2484
2485         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2486         memset(hdr, 0, ISCSI_HDR_LEN);
2487         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2488         hdr->flags              = datain.flags;
2489         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2490                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2491                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2492                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2493                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2494                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2495                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2496                 }
2497         }
2498         hton24(hdr->dlength, datain.length);
2499         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2500                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2501                                 (struct scsi_lun *)&hdr->lun);
2502         else
2503                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2504
2505         hdr->itt                = cmd->init_task_tag;
2506
2507         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2508                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2509         else
2510                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2511         if (set_statsn)
2512                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2513         else
2514                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2515
2516         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2517         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2518         hdr->datasn             = cpu_to_be32(datain.data_sn);
2519         hdr->offset             = cpu_to_be32(datain.offset);
2520
2521         iov = &cmd->iov_data[0];
2522         iov[iov_count].iov_base = cmd->pdu;
2523         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2524         tx_size += ISCSI_HDR_LEN;
2525
2526         if (conn->conn_ops->HeaderDigest) {
2527                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2528
2529                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2530                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2531                                 0, NULL, (u8 *)header_digest);
2532
2533                 iov[0].iov_len += ISCSI_CRC_LEN;
2534                 tx_size += ISCSI_CRC_LEN;
2535
2536                 pr_debug("Attaching CRC32 HeaderDigest"
2537                         " for DataIN PDU 0x%08x\n", *header_digest);
2538         }
2539
2540         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2541         if (iov_ret < 0)
2542                 return -1;
2543
2544         iov_count += iov_ret;
2545         tx_size += datain.length;
2546
2547         cmd->padding = ((-datain.length) & 3);
2548         if (cmd->padding) {
2549                 iov[iov_count].iov_base         = cmd->pad_bytes;
2550                 iov[iov_count++].iov_len        = cmd->padding;
2551                 tx_size += cmd->padding;
2552
2553                 pr_debug("Attaching %u padding bytes\n",
2554                                 cmd->padding);
2555         }
2556         if (conn->conn_ops->DataDigest) {
2557                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2558                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2559
2560                 iov[iov_count].iov_base = &cmd->data_crc;
2561                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2562                 tx_size += ISCSI_CRC_LEN;
2563
2564                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2565                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2566         }
2567
2568         cmd->iov_data_count = iov_count;
2569         cmd->tx_size = tx_size;
2570
2571         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2572                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2573                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2574                 ntohl(hdr->offset), datain.length, conn->cid);
2575
2576         /* sendpage is preferred but can't insert markers */
2577         if (!conn->conn_ops->IFMarker)
2578                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2579         else
2580                 ret = iscsit_send_tx_data(cmd, conn, 0);
2581
2582         iscsit_unmap_iovec(cmd);
2583
2584         if (ret < 0) {
2585                 iscsit_tx_thread_wait_for_tcp(conn);
2586                 return ret;
2587         }
2588
2589         if (dr->dr_complete) {
2590                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2591                                 2 : 1;
2592                 iscsit_free_datain_req(cmd, dr);
2593         }
2594
2595         return eodr;
2596 }
2597
2598 static int iscsit_send_logout_response(
2599         struct iscsi_cmd *cmd,
2600         struct iscsi_conn *conn)
2601 {
2602         int niov = 0, tx_size;
2603         struct iscsi_conn *logout_conn = NULL;
2604         struct iscsi_conn_recovery *cr = NULL;
2605         struct iscsi_session *sess = conn->sess;
2606         struct kvec *iov;
2607         struct iscsi_logout_rsp *hdr;
2608         /*
2609          * The actual shutting down of Sessions and/or Connections
2610          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2611          * is done in scsi_logout_post_handler().
2612          */
2613         switch (cmd->logout_reason) {
2614         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2615                 pr_debug("iSCSI session logout successful, setting"
2616                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2617                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2618                 break;
2619         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2620                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2621                         break;
2622                 /*
2623                  * For CLOSECONNECTION logout requests carrying
2624                  * a matching logout CID -> local CID, the reference
2625                  * for the local CID will have been incremented in
2626                  * iscsi_logout_closeconnection().
2627                  *
2628                  * For CLOSECONNECTION logout requests carrying
2629                  * a different CID than the connection it arrived
2630                  * on, the connection responding to cmd->logout_cid
2631                  * is stopped in iscsit_logout_post_handler_diffcid().
2632                  */
2633
2634                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2635                         " successful.\n", cmd->logout_cid, conn->cid);
2636                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2637                 break;
2638         case ISCSI_LOGOUT_REASON_RECOVERY:
2639                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2640                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2641                         break;
2642                 /*
2643                  * If the connection is still active from our point of view
2644                  * force connection recovery to occur.
2645                  */
2646                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2647                                 cmd->logout_cid);
2648                 if (logout_conn) {
2649                         iscsit_connection_reinstatement_rcfr(logout_conn);
2650                         iscsit_dec_conn_usage_count(logout_conn);
2651                 }
2652
2653                 cr = iscsit_get_inactive_connection_recovery_entry(
2654                                 conn->sess, cmd->logout_cid);
2655                 if (!cr) {
2656                         pr_err("Unable to locate CID: %hu for"
2657                         " REMOVECONNFORRECOVERY Logout Request.\n",
2658                                 cmd->logout_cid);
2659                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2660                         break;
2661                 }
2662
2663                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2664
2665                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2666                         " for recovery for CID: %hu on CID: %hu successful.\n",
2667                                 cmd->logout_cid, conn->cid);
2668                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2669                 break;
2670         default:
2671                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2672                                 cmd->logout_reason);
2673                 return -1;
2674         }
2675
2676         tx_size = ISCSI_HDR_LEN;
2677         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2678         memset(hdr, 0, ISCSI_HDR_LEN);
2679         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2680         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2681         hdr->response           = cmd->logout_response;
2682         hdr->itt                = cmd->init_task_tag;
2683         cmd->stat_sn            = conn->stat_sn++;
2684         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2685
2686         iscsit_increment_maxcmdsn(cmd, conn->sess);
2687         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2688         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2689
2690         iov = &cmd->iov_misc[0];
2691         iov[niov].iov_base      = cmd->pdu;
2692         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2693
2694         if (conn->conn_ops->HeaderDigest) {
2695                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2696
2697                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2698                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2699                                 0, NULL, (u8 *)header_digest);
2700
2701                 iov[0].iov_len += ISCSI_CRC_LEN;
2702                 tx_size += ISCSI_CRC_LEN;
2703                 pr_debug("Attaching CRC32C HeaderDigest to"
2704                         " Logout Response 0x%08x\n", *header_digest);
2705         }
2706         cmd->iov_misc_count = niov;
2707         cmd->tx_size = tx_size;
2708
2709         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2710                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2711                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2712                 cmd->logout_cid, conn->cid);
2713
2714         return 0;
2715 }
2716
2717 /*
2718  *      Unsolicited NOPIN, either requesting a response or not.
2719  */
2720 static int iscsit_send_unsolicited_nopin(
2721         struct iscsi_cmd *cmd,
2722         struct iscsi_conn *conn,
2723         int want_response)
2724 {
2725         int tx_size = ISCSI_HDR_LEN;
2726         struct iscsi_nopin *hdr;
2727         int ret;
2728
2729         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2730         memset(hdr, 0, ISCSI_HDR_LEN);
2731         hdr->opcode             = ISCSI_OP_NOOP_IN;
2732         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2733         hdr->itt                = cmd->init_task_tag;
2734         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2735         cmd->stat_sn            = conn->stat_sn;
2736         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2737         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2738         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2739
2740         if (conn->conn_ops->HeaderDigest) {
2741                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2742
2743                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2744                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2745                                 0, NULL, (u8 *)header_digest);
2746
2747                 tx_size += ISCSI_CRC_LEN;
2748                 pr_debug("Attaching CRC32C HeaderDigest to"
2749                         " NopIN 0x%08x\n", *header_digest);
2750         }
2751
2752         cmd->iov_misc[0].iov_base       = cmd->pdu;
2753         cmd->iov_misc[0].iov_len        = tx_size;
2754         cmd->iov_misc_count     = 1;
2755         cmd->tx_size            = tx_size;
2756
2757         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2758                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2759
2760         ret = iscsit_send_tx_data(cmd, conn, 1);
2761         if (ret < 0) {
2762                 iscsit_tx_thread_wait_for_tcp(conn);
2763                 return ret;
2764         }
2765
2766         spin_lock_bh(&cmd->istate_lock);
2767         cmd->i_state = want_response ?
2768                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2769         spin_unlock_bh(&cmd->istate_lock);
2770
2771         return 0;
2772 }
2773
2774 static int iscsit_send_nopin_response(
2775         struct iscsi_cmd *cmd,
2776         struct iscsi_conn *conn)
2777 {
2778         int niov = 0, tx_size;
2779         u32 padding = 0;
2780         struct kvec *iov;
2781         struct iscsi_nopin *hdr;
2782
2783         tx_size = ISCSI_HDR_LEN;
2784         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2785         memset(hdr, 0, ISCSI_HDR_LEN);
2786         hdr->opcode             = ISCSI_OP_NOOP_IN;
2787         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2788         hton24(hdr->dlength, cmd->buf_ptr_size);
2789         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2790         hdr->itt                = cmd->init_task_tag;
2791         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2792         cmd->stat_sn            = conn->stat_sn++;
2793         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2794
2795         iscsit_increment_maxcmdsn(cmd, conn->sess);
2796         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2797         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2798
2799         iov = &cmd->iov_misc[0];
2800         iov[niov].iov_base      = cmd->pdu;
2801         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2802
2803         if (conn->conn_ops->HeaderDigest) {
2804                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2805
2806                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2807                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2808                                 0, NULL, (u8 *)header_digest);
2809
2810                 iov[0].iov_len += ISCSI_CRC_LEN;
2811                 tx_size += ISCSI_CRC_LEN;
2812                 pr_debug("Attaching CRC32C HeaderDigest"
2813                         " to NopIn 0x%08x\n", *header_digest);
2814         }
2815
2816         /*
2817          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2818          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2819          */
2820         if (cmd->buf_ptr_size) {
2821                 iov[niov].iov_base      = cmd->buf_ptr;
2822                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2823                 tx_size += cmd->buf_ptr_size;
2824
2825                 pr_debug("Echoing back %u bytes of ping"
2826                         " data.\n", cmd->buf_ptr_size);
2827
2828                 padding = ((-cmd->buf_ptr_size) & 3);
2829                 if (padding != 0) {
2830                         iov[niov].iov_base = &cmd->pad_bytes;
2831                         iov[niov++].iov_len = padding;
2832                         tx_size += padding;
2833                         pr_debug("Attaching %u additional"
2834                                 " padding bytes.\n", padding);
2835                 }
2836                 if (conn->conn_ops->DataDigest) {
2837                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2838                                 cmd->buf_ptr, cmd->buf_ptr_size,
2839                                 padding, (u8 *)&cmd->pad_bytes,
2840                                 (u8 *)&cmd->data_crc);
2841
2842                         iov[niov].iov_base = &cmd->data_crc;
2843                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2844                         tx_size += ISCSI_CRC_LEN;
2845                         pr_debug("Attached DataDigest for %u"
2846                                 " bytes of ping data, CRC 0x%08x\n",
2847                                 cmd->buf_ptr_size, cmd->data_crc);
2848                 }
2849         }
2850
2851         cmd->iov_misc_count = niov;
2852         cmd->tx_size = tx_size;
2853
2854         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2855                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2856                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2857
2858         return 0;
2859 }
2860
2861 static int iscsit_send_r2t(
2862         struct iscsi_cmd *cmd,
2863         struct iscsi_conn *conn)
2864 {
2865         int tx_size = 0;
2866         struct iscsi_r2t *r2t;
2867         struct iscsi_r2t_rsp *hdr;
2868         int ret;
2869
2870         r2t = iscsit_get_r2t_from_list(cmd);
2871         if (!r2t)
2872                 return -1;
2873
2874         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2875         memset(hdr, 0, ISCSI_HDR_LEN);
2876         hdr->opcode             = ISCSI_OP_R2T;
2877         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2878         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2879                         (struct scsi_lun *)&hdr->lun);
2880         hdr->itt                = cmd->init_task_tag;
2881         spin_lock_bh(&conn->sess->ttt_lock);
2882         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2883         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2884                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2885         spin_unlock_bh(&conn->sess->ttt_lock);
2886         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2887         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2888         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2889         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2890         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2891         hdr->data_offset        = cpu_to_be32(r2t->offset);
2892         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2893
2894         cmd->iov_misc[0].iov_base       = cmd->pdu;
2895         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2896         tx_size += ISCSI_HDR_LEN;
2897
2898         if (conn->conn_ops->HeaderDigest) {
2899                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2900
2901                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2902                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2903                                 0, NULL, (u8 *)header_digest);
2904
2905                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2906                 tx_size += ISCSI_CRC_LEN;
2907                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2908                         " PDU 0x%08x\n", *header_digest);
2909         }
2910
2911         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2912                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2913                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2914                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2915                         r2t->offset, r2t->xfer_len, conn->cid);
2916
2917         cmd->iov_misc_count = 1;
2918         cmd->tx_size = tx_size;
2919
2920         spin_lock_bh(&cmd->r2t_lock);
2921         r2t->sent_r2t = 1;
2922         spin_unlock_bh(&cmd->r2t_lock);
2923
2924         ret = iscsit_send_tx_data(cmd, conn, 1);
2925         if (ret < 0) {
2926                 iscsit_tx_thread_wait_for_tcp(conn);
2927                 return ret;
2928         }
2929
2930         spin_lock_bh(&cmd->dataout_timeout_lock);
2931         iscsit_start_dataout_timer(cmd, conn);
2932         spin_unlock_bh(&cmd->dataout_timeout_lock);
2933
2934         return 0;
2935 }
2936
2937 /*
2938  *      @recovery: If called from iscsi_task_reassign_complete_write() for
2939  *              connection recovery.
2940  */
2941 int iscsit_build_r2ts_for_cmd(
2942         struct iscsi_cmd *cmd,
2943         struct iscsi_conn *conn,
2944         bool recovery)
2945 {
2946         int first_r2t = 1;
2947         u32 offset = 0, xfer_len = 0;
2948
2949         spin_lock_bh(&cmd->r2t_lock);
2950         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2951                 spin_unlock_bh(&cmd->r2t_lock);
2952                 return 0;
2953         }
2954
2955         if (conn->sess->sess_ops->DataSequenceInOrder &&
2956             !recovery)
2957                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2958
2959         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2960                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2961                         offset = cmd->r2t_offset;
2962
2963                         if (first_r2t && recovery) {
2964                                 int new_data_end = offset +
2965                                         conn->sess->sess_ops->MaxBurstLength -
2966                                         cmd->next_burst_len;
2967
2968                                 if (new_data_end > cmd->se_cmd.data_length)
2969                                         xfer_len = cmd->se_cmd.data_length - offset;
2970                                 else
2971                                         xfer_len =
2972                                                 conn->sess->sess_ops->MaxBurstLength -
2973                                                 cmd->next_burst_len;
2974                         } else {
2975                                 int new_data_end = offset +
2976                                         conn->sess->sess_ops->MaxBurstLength;
2977
2978                                 if (new_data_end > cmd->se_cmd.data_length)
2979                                         xfer_len = cmd->se_cmd.data_length - offset;
2980                                 else
2981                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
2982                         }
2983                         cmd->r2t_offset += xfer_len;
2984
2985                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
2986                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2987                 } else {
2988                         struct iscsi_seq *seq;
2989
2990                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2991                         if (!seq) {
2992                                 spin_unlock_bh(&cmd->r2t_lock);
2993                                 return -1;
2994                         }
2995
2996                         offset = seq->offset;
2997                         xfer_len = seq->xfer_len;
2998
2999                         if (cmd->seq_send_order == cmd->seq_count)
3000                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3001                 }
3002                 cmd->outstanding_r2ts++;
3003                 first_r2t = 0;
3004
3005                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3006                         spin_unlock_bh(&cmd->r2t_lock);
3007                         return -1;
3008                 }
3009
3010                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3011                         break;
3012         }
3013         spin_unlock_bh(&cmd->r2t_lock);
3014
3015         return 0;
3016 }
3017
3018 static int iscsit_send_status(
3019         struct iscsi_cmd *cmd,
3020         struct iscsi_conn *conn)
3021 {
3022         u8 iov_count = 0, recovery;
3023         u32 padding = 0, tx_size = 0;
3024         struct iscsi_scsi_rsp *hdr;
3025         struct kvec *iov;
3026
3027         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3028         if (!recovery)
3029                 cmd->stat_sn = conn->stat_sn++;
3030
3031         spin_lock_bh(&conn->sess->session_stats_lock);
3032         conn->sess->rsp_pdus++;
3033         spin_unlock_bh(&conn->sess->session_stats_lock);
3034
3035         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3036         memset(hdr, 0, ISCSI_HDR_LEN);
3037         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3038         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3039         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3040                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3041                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3042         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3043                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3044                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3045         }
3046         hdr->response           = cmd->iscsi_response;
3047         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3048         hdr->itt                = cmd->init_task_tag;
3049         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3050
3051         iscsit_increment_maxcmdsn(cmd, conn->sess);
3052         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3053         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3054
3055         iov = &cmd->iov_misc[0];
3056         iov[iov_count].iov_base = cmd->pdu;
3057         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3058         tx_size += ISCSI_HDR_LEN;
3059
3060         /*
3061          * Attach SENSE DATA payload to iSCSI Response PDU
3062          */
3063         if (cmd->se_cmd.sense_buffer &&
3064            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3065             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3066                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3067                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3068
3069                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3070                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3071                 iov[iov_count].iov_base = cmd->sense_buffer;
3072                 iov[iov_count++].iov_len =
3073                                 (cmd->se_cmd.scsi_sense_length + padding);
3074                 tx_size += cmd->se_cmd.scsi_sense_length;
3075
3076                 if (padding) {
3077                         memset(cmd->sense_buffer +
3078                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3079                         tx_size += padding;
3080                         pr_debug("Adding %u bytes of padding to"
3081                                 " SENSE.\n", padding);
3082                 }
3083
3084                 if (conn->conn_ops->DataDigest) {
3085                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3086                                 cmd->sense_buffer,
3087                                 (cmd->se_cmd.scsi_sense_length + padding),
3088                                 0, NULL, (u8 *)&cmd->data_crc);
3089
3090                         iov[iov_count].iov_base    = &cmd->data_crc;
3091                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3092                         tx_size += ISCSI_CRC_LEN;
3093
3094                         pr_debug("Attaching CRC32 DataDigest for"
3095                                 " SENSE, %u bytes CRC 0x%08x\n",
3096                                 (cmd->se_cmd.scsi_sense_length + padding),
3097                                 cmd->data_crc);
3098                 }
3099
3100                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3101                                 " Response PDU\n",
3102                                 cmd->se_cmd.scsi_sense_length);
3103         }
3104
3105         if (conn->conn_ops->HeaderDigest) {
3106                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3107
3108                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3109                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3110                                 0, NULL, (u8 *)header_digest);
3111
3112                 iov[0].iov_len += ISCSI_CRC_LEN;
3113                 tx_size += ISCSI_CRC_LEN;
3114                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3115                                 " PDU 0x%08x\n", *header_digest);
3116         }
3117
3118         cmd->iov_misc_count = iov_count;
3119         cmd->tx_size = tx_size;
3120
3121         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3122                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3123                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3124                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3125
3126         return 0;
3127 }
3128
3129 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3130 {
3131         switch (se_tmr->response) {
3132         case TMR_FUNCTION_COMPLETE:
3133                 return ISCSI_TMF_RSP_COMPLETE;
3134         case TMR_TASK_DOES_NOT_EXIST:
3135                 return ISCSI_TMF_RSP_NO_TASK;
3136         case TMR_LUN_DOES_NOT_EXIST:
3137                 return ISCSI_TMF_RSP_NO_LUN;
3138         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3139                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3140         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3141                 return ISCSI_TMF_RSP_AUTH_FAILED;
3142         case TMR_FUNCTION_REJECTED:
3143         default:
3144                 return ISCSI_TMF_RSP_REJECTED;
3145         }
3146 }
3147
3148 static int iscsit_send_task_mgt_rsp(
3149         struct iscsi_cmd *cmd,
3150         struct iscsi_conn *conn)
3151 {
3152         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3153         struct iscsi_tm_rsp *hdr;
3154         u32 tx_size = 0;
3155
3156         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3157         memset(hdr, 0, ISCSI_HDR_LEN);
3158         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3159         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3160         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3161         hdr->itt                = cmd->init_task_tag;
3162         cmd->stat_sn            = conn->stat_sn++;
3163         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3164
3165         iscsit_increment_maxcmdsn(cmd, conn->sess);
3166         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3167         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3168
3169         cmd->iov_misc[0].iov_base       = cmd->pdu;
3170         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3171         tx_size += ISCSI_HDR_LEN;
3172
3173         if (conn->conn_ops->HeaderDigest) {
3174                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3175
3176                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3177                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3178                                 0, NULL, (u8 *)header_digest);
3179
3180                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3181                 tx_size += ISCSI_CRC_LEN;
3182                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3183                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3184         }
3185
3186         cmd->iov_misc_count = 1;
3187         cmd->tx_size = tx_size;
3188
3189         pr_debug("Built Task Management Response ITT: 0x%08x,"
3190                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3191                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3192
3193         return 0;
3194 }
3195
3196 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3197 {
3198         bool ret = false;
3199
3200         if (np->np_sockaddr.ss_family == AF_INET6) {
3201                 const struct sockaddr_in6 sin6 = {
3202                         .sin6_addr = IN6ADDR_ANY_INIT };
3203                 struct sockaddr_in6 *sock_in6 =
3204                          (struct sockaddr_in6 *)&np->np_sockaddr;
3205
3206                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3207                                 sin6.sin6_addr.s6_addr, 16))
3208                         ret = true;
3209         } else {
3210                 struct sockaddr_in * sock_in =
3211                         (struct sockaddr_in *)&np->np_sockaddr;
3212
3213                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3214                         ret = true;
3215         }
3216
3217         return ret;
3218 }
3219
3220 #define SENDTARGETS_BUF_LIMIT 32768U
3221
3222 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3223 {
3224         char *payload = NULL;
3225         struct iscsi_conn *conn = cmd->conn;
3226         struct iscsi_portal_group *tpg;
3227         struct iscsi_tiqn *tiqn;
3228         struct iscsi_tpg_np *tpg_np;
3229         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3230         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3231
3232         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3233                          SENDTARGETS_BUF_LIMIT);
3234
3235         payload = kzalloc(buffer_len, GFP_KERNEL);
3236         if (!payload) {
3237                 pr_err("Unable to allocate memory for sendtargets"
3238                                 " response.\n");
3239                 return -ENOMEM;
3240         }
3241
3242         spin_lock(&tiqn_lock);
3243         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3244                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3245                 len += 1;
3246
3247                 if ((len + payload_len) > buffer_len) {
3248                         end_of_buf = 1;
3249                         goto eob;
3250                 }
3251                 memcpy(payload + payload_len, buf, len);
3252                 payload_len += len;
3253
3254                 spin_lock(&tiqn->tiqn_tpg_lock);
3255                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3256
3257                         spin_lock(&tpg->tpg_state_lock);
3258                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3259                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3260                                 spin_unlock(&tpg->tpg_state_lock);
3261                                 continue;
3262                         }
3263                         spin_unlock(&tpg->tpg_state_lock);
3264
3265                         spin_lock(&tpg->tpg_np_lock);
3266                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3267                                                 tpg_np_list) {
3268                                 struct iscsi_np *np = tpg_np->tpg_np;
3269                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3270
3271                                 len = sprintf(buf, "TargetAddress="
3272                                         "%s%s%s:%hu,%hu",
3273                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3274                                         "[" : "", (inaddr_any == false) ?
3275                                                 np->np_ip : conn->local_ip,
3276                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3277                                         "]" : "", (inaddr_any == false) ?
3278                                                 np->np_port : conn->local_port,
3279                                         tpg->tpgt);
3280                                 len += 1;
3281
3282                                 if ((len + payload_len) > buffer_len) {
3283                                         spin_unlock(&tpg->tpg_np_lock);
3284                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3285                                         end_of_buf = 1;
3286                                         goto eob;
3287                                 }
3288                                 memcpy(payload + payload_len, buf, len);
3289                                 payload_len += len;
3290                         }
3291                         spin_unlock(&tpg->tpg_np_lock);
3292                 }
3293                 spin_unlock(&tiqn->tiqn_tpg_lock);
3294 eob:
3295                 if (end_of_buf)
3296                         break;
3297         }
3298         spin_unlock(&tiqn_lock);
3299
3300         cmd->buf_ptr = payload;
3301
3302         return payload_len;
3303 }
3304
3305 /*
3306  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3307  *      MaxRecvDataSegmentLength.
3308  */
3309 static int iscsit_send_text_rsp(
3310         struct iscsi_cmd *cmd,
3311         struct iscsi_conn *conn)
3312 {
3313         struct iscsi_text_rsp *hdr;
3314         struct kvec *iov;
3315         u32 padding = 0, tx_size = 0;
3316         int text_length, iov_count = 0;
3317
3318         text_length = iscsit_build_sendtargets_response(cmd);
3319         if (text_length < 0)
3320                 return text_length;
3321
3322         padding = ((-text_length) & 3);
3323         if (padding != 0) {
3324                 memset(cmd->buf_ptr + text_length, 0, padding);
3325                 pr_debug("Attaching %u additional bytes for"
3326                         " padding.\n", padding);
3327         }
3328
3329         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3330         memset(hdr, 0, ISCSI_HDR_LEN);
3331         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3332         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3333         hton24(hdr->dlength, text_length);
3334         hdr->itt                = cmd->init_task_tag;
3335         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3336         cmd->stat_sn            = conn->stat_sn++;
3337         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3338
3339         iscsit_increment_maxcmdsn(cmd, conn->sess);
3340         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3341         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3342
3343         iov = &cmd->iov_misc[0];
3344
3345         iov[iov_count].iov_base = cmd->pdu;
3346         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3347         iov[iov_count].iov_base = cmd->buf_ptr;
3348         iov[iov_count++].iov_len = text_length + padding;
3349
3350         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3351
3352         if (conn->conn_ops->HeaderDigest) {
3353                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3354
3355                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3356                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3357                                 0, NULL, (u8 *)header_digest);
3358
3359                 iov[0].iov_len += ISCSI_CRC_LEN;
3360                 tx_size += ISCSI_CRC_LEN;
3361                 pr_debug("Attaching CRC32 HeaderDigest for"
3362                         " Text Response PDU 0x%08x\n", *header_digest);
3363         }
3364
3365         if (conn->conn_ops->DataDigest) {
3366                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3367                                 cmd->buf_ptr, (text_length + padding),
3368                                 0, NULL, (u8 *)&cmd->data_crc);
3369
3370                 iov[iov_count].iov_base = &cmd->data_crc;
3371                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3372                 tx_size += ISCSI_CRC_LEN;
3373
3374                 pr_debug("Attaching DataDigest for %u bytes of text"
3375                         " data, CRC 0x%08x\n", (text_length + padding),
3376                         cmd->data_crc);
3377         }
3378
3379         cmd->iov_misc_count = iov_count;
3380         cmd->tx_size = tx_size;
3381
3382         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3383                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3384                         text_length, conn->cid);
3385         return 0;
3386 }
3387
3388 static int iscsit_send_reject(
3389         struct iscsi_cmd *cmd,
3390         struct iscsi_conn *conn)
3391 {
3392         u32 iov_count = 0, tx_size = 0;
3393         struct iscsi_reject *hdr;
3394         struct kvec *iov;
3395
3396         hdr                     = (struct iscsi_reject *) cmd->pdu;
3397         hdr->opcode             = ISCSI_OP_REJECT;
3398         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3399         hton24(hdr->dlength, ISCSI_HDR_LEN);
3400         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3401         cmd->stat_sn            = conn->stat_sn++;
3402         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3403         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3404         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3405
3406         iov = &cmd->iov_misc[0];
3407
3408         iov[iov_count].iov_base = cmd->pdu;
3409         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3410         iov[iov_count].iov_base = cmd->buf_ptr;
3411         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3412
3413         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3414
3415         if (conn->conn_ops->HeaderDigest) {
3416                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3417
3418                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3419                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3420                                 0, NULL, (u8 *)header_digest);
3421
3422                 iov[0].iov_len += ISCSI_CRC_LEN;
3423                 tx_size += ISCSI_CRC_LEN;
3424                 pr_debug("Attaching CRC32 HeaderDigest for"
3425                         " REJECT PDU 0x%08x\n", *header_digest);
3426         }
3427
3428         if (conn->conn_ops->DataDigest) {
3429                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3430                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3431                                 0, NULL, (u8 *)&cmd->data_crc);
3432
3433                 iov[iov_count].iov_base = &cmd->data_crc;
3434                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3435                 tx_size += ISCSI_CRC_LEN;
3436                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3437                                 " PDU 0x%08x\n", cmd->data_crc);
3438         }
3439
3440         cmd->iov_misc_count = iov_count;
3441         cmd->tx_size = tx_size;
3442
3443         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3444                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3445
3446         return 0;
3447 }
3448
3449 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3450 {
3451         struct iscsi_thread_set *ts = conn->thread_set;
3452         int ord, cpu;
3453         /*
3454          * thread_id is assigned from iscsit_global->ts_bitmap from
3455          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3456          *
3457          * Here we use thread_id to determine which CPU that this
3458          * iSCSI connection's iscsi_thread_set will be scheduled to
3459          * execute upon.
3460          */
3461         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3462         for_each_online_cpu(cpu) {
3463                 if (ord-- == 0) {
3464                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3465                         return;
3466                 }
3467         }
3468         /*
3469          * This should never be reached..
3470          */
3471         dump_stack();
3472         cpumask_setall(conn->conn_cpumask);
3473 }
3474
3475 static inline void iscsit_thread_check_cpumask(
3476         struct iscsi_conn *conn,
3477         struct task_struct *p,
3478         int mode)
3479 {
3480         char buf[128];
3481         /*
3482          * mode == 1 signals iscsi_target_tx_thread() usage.
3483          * mode == 0 signals iscsi_target_rx_thread() usage.
3484          */
3485         if (mode == 1) {
3486                 if (!conn->conn_tx_reset_cpumask)
3487                         return;
3488                 conn->conn_tx_reset_cpumask = 0;
3489         } else {
3490                 if (!conn->conn_rx_reset_cpumask)
3491                         return;
3492                 conn->conn_rx_reset_cpumask = 0;
3493         }
3494         /*
3495          * Update the CPU mask for this single kthread so that
3496          * both TX and RX kthreads are scheduled to run on the
3497          * same CPU.
3498          */
3499         memset(buf, 0, 128);
3500         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3501         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3502 }
3503
3504 static int handle_immediate_queue(struct iscsi_conn *conn)
3505 {
3506         struct iscsi_queue_req *qr;
3507         struct iscsi_cmd *cmd;
3508         u8 state;
3509         int ret;
3510
3511         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3512                 atomic_set(&conn->check_immediate_queue, 0);
3513                 cmd = qr->cmd;
3514                 state = qr->state;
3515                 kmem_cache_free(lio_qr_cache, qr);
3516
3517                 switch (state) {
3518                 case ISTATE_SEND_R2T:
3519                         ret = iscsit_send_r2t(cmd, conn);
3520                         if (ret < 0)
3521                                 goto err;
3522                         break;
3523                 case ISTATE_REMOVE:
3524                         if (cmd->data_direction == DMA_TO_DEVICE)
3525                                 iscsit_stop_dataout_timer(cmd);
3526
3527                         spin_lock_bh(&conn->cmd_lock);
3528                         list_del(&cmd->i_conn_node);
3529                         spin_unlock_bh(&conn->cmd_lock);
3530
3531                         iscsit_free_cmd(cmd);
3532                         continue;
3533                 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3534                         iscsit_mod_nopin_response_timer(conn);
3535                         ret = iscsit_send_unsolicited_nopin(cmd,
3536                                                             conn, 1);
3537                         if (ret < 0)
3538                                 goto err;
3539                         break;
3540                 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3541                         ret = iscsit_send_unsolicited_nopin(cmd,
3542                                                             conn, 0);
3543                         if (ret < 0)
3544                                 goto err;
3545                         break;
3546                 default:
3547                         pr_err("Unknown Opcode: 0x%02x ITT:"
3548                                " 0x%08x, i_state: %d on CID: %hu\n",
3549                                cmd->iscsi_opcode, cmd->init_task_tag, state,
3550                                conn->cid);
3551                         goto err;
3552                 }
3553         }
3554
3555         return 0;
3556
3557 err:
3558         return -1;
3559 }
3560
3561 static int handle_response_queue(struct iscsi_conn *conn)
3562 {
3563         struct iscsi_queue_req *qr;
3564         struct iscsi_cmd *cmd;
3565         u8 state;
3566         int ret;
3567
3568         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3569                 cmd = qr->cmd;
3570                 state = qr->state;
3571                 kmem_cache_free(lio_qr_cache, qr);
3572
3573 check_rsp_state:
3574                 switch (state) {
3575                 case ISTATE_SEND_DATAIN:
3576                         ret = iscsit_send_data_in(cmd, conn);
3577                         if (ret < 0)
3578                                 goto err;
3579                         else if (!ret)
3580                                 /* more drs */
3581                                 goto check_rsp_state;
3582                         else if (ret == 1) {
3583                                 /* all done */
3584                                 spin_lock_bh(&cmd->istate_lock);
3585                                 cmd->i_state = ISTATE_SENT_STATUS;
3586                                 spin_unlock_bh(&cmd->istate_lock);
3587
3588                                 if (atomic_read(&conn->check_immediate_queue))
3589                                         return 1;
3590
3591                                 continue;
3592                         } else if (ret == 2) {
3593                                 /* Still must send status,
3594                                    SCF_TRANSPORT_TASK_SENSE was set */
3595                                 spin_lock_bh(&cmd->istate_lock);
3596                                 cmd->i_state = ISTATE_SEND_STATUS;
3597                                 spin_unlock_bh(&cmd->istate_lock);
3598                                 state = ISTATE_SEND_STATUS;
3599                                 goto check_rsp_state;
3600                         }
3601
3602                         break;
3603                 case ISTATE_SEND_STATUS:
3604                 case ISTATE_SEND_STATUS_RECOVERY:
3605                         ret = iscsit_send_status(cmd, conn);
3606                         break;
3607                 case ISTATE_SEND_LOGOUTRSP:
3608                         ret = iscsit_send_logout_response(cmd, conn);
3609                         break;
3610                 case ISTATE_SEND_ASYNCMSG:
3611                         ret = iscsit_send_conn_drop_async_message(
3612                                 cmd, conn);
3613                         break;
3614                 case ISTATE_SEND_NOPIN:
3615                         ret = iscsit_send_nopin_response(cmd, conn);
3616                         break;
3617                 case ISTATE_SEND_REJECT:
3618                         ret = iscsit_send_reject(cmd, conn);
3619                         break;
3620                 case ISTATE_SEND_TASKMGTRSP:
3621                         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3622                         if (ret != 0)
3623                                 break;
3624                         ret = iscsit_tmr_post_handler(cmd, conn);
3625                         if (ret != 0)
3626                                 iscsit_fall_back_to_erl0(conn->sess);
3627                         break;
3628                 case ISTATE_SEND_TEXTRSP:
3629                         ret = iscsit_send_text_rsp(cmd, conn);
3630                         break;
3631                 default:
3632                         pr_err("Unknown Opcode: 0x%02x ITT:"
3633                                " 0x%08x, i_state: %d on CID: %hu\n",
3634                                cmd->iscsi_opcode, cmd->init_task_tag,
3635                                state, conn->cid);
3636                         goto err;
3637                 }
3638                 if (ret < 0)
3639                         goto err;
3640
3641                 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3642                         iscsit_tx_thread_wait_for_tcp(conn);
3643                         iscsit_unmap_iovec(cmd);
3644                         goto err;
3645                 }
3646                 iscsit_unmap_iovec(cmd);
3647
3648                 switch (state) {
3649                 case ISTATE_SEND_LOGOUTRSP:
3650                         if (!iscsit_logout_post_handler(cmd, conn))
3651                                 goto restart;
3652                         /* fall through */
3653                 case ISTATE_SEND_STATUS:
3654                 case ISTATE_SEND_ASYNCMSG:
3655                 case ISTATE_SEND_NOPIN:
3656                 case ISTATE_SEND_STATUS_RECOVERY:
3657                 case ISTATE_SEND_TEXTRSP:
3658                 case ISTATE_SEND_TASKMGTRSP:
3659                         spin_lock_bh(&cmd->istate_lock);
3660                         cmd->i_state = ISTATE_SENT_STATUS;
3661                         spin_unlock_bh(&cmd->istate_lock);
3662                         break;
3663                 case ISTATE_SEND_REJECT:
3664                         if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3665                                 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3666                                 complete(&cmd->reject_comp);
3667                                 goto err;
3668                         }
3669                         complete(&cmd->reject_comp);
3670                         break;
3671                 default:
3672                         pr_err("Unknown Opcode: 0x%02x ITT:"
3673                                " 0x%08x, i_state: %d on CID: %hu\n",
3674                                cmd->iscsi_opcode, cmd->init_task_tag,
3675                                cmd->i_state, conn->cid);
3676                         goto err;
3677                 }
3678
3679                 if (atomic_read(&conn->check_immediate_queue))
3680                         return 1;
3681         }
3682
3683         return 0;
3684
3685 err:
3686         return -1;
3687 restart:
3688         return -EAGAIN;
3689 }
3690
3691 int iscsi_target_tx_thread(void *arg)
3692 {
3693         int ret = 0;
3694         struct iscsi_conn *conn;
3695         struct iscsi_thread_set *ts = arg;
3696         /*
3697          * Allow ourselves to be interrupted by SIGINT so that a
3698          * connection recovery / failure event can be triggered externally.
3699          */
3700         allow_signal(SIGINT);
3701
3702 restart:
3703         conn = iscsi_tx_thread_pre_handler(ts);
3704         if (!conn)
3705                 goto out;
3706
3707         ret = 0;
3708
3709         while (!kthread_should_stop()) {
3710                 /*
3711                  * Ensure that both TX and RX per connection kthreads
3712                  * are scheduled to run on the same CPU.
3713                  */
3714                 iscsit_thread_check_cpumask(conn, current, 1);
3715
3716                 wait_event_interruptible(conn->queues_wq,
3717                                          !iscsit_conn_all_queues_empty(conn) ||
3718                                          ts->status == ISCSI_THREAD_SET_RESET);
3719
3720                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3721                      signal_pending(current))
3722                         goto transport_err;
3723
3724 get_immediate:
3725                 ret = handle_immediate_queue(conn);
3726                 if (ret < 0)
3727                         goto transport_err;
3728
3729                 ret = handle_response_queue(conn);
3730                 if (ret == 1)
3731                         goto get_immediate;
3732                 else if (ret == -EAGAIN)
3733                         goto restart;
3734                 else if (ret < 0)
3735                         goto transport_err;
3736         }
3737
3738 transport_err:
3739         iscsit_take_action_for_connection_exit(conn);
3740         goto restart;
3741 out:
3742         return 0;
3743 }
3744
3745 int iscsi_target_rx_thread(void *arg)
3746 {
3747         int ret;
3748         u8 buffer[ISCSI_HDR_LEN], opcode;
3749         u32 checksum = 0, digest = 0;
3750         struct iscsi_conn *conn = NULL;
3751         struct iscsi_thread_set *ts = arg;
3752         struct kvec iov;
3753         /*
3754          * Allow ourselves to be interrupted by SIGINT so that a
3755          * connection recovery / failure event can be triggered externally.
3756          */
3757         allow_signal(SIGINT);
3758
3759 restart:
3760         conn = iscsi_rx_thread_pre_handler(ts);
3761         if (!conn)
3762                 goto out;
3763
3764         while (!kthread_should_stop()) {
3765                 /*
3766                  * Ensure that both TX and RX per connection kthreads
3767                  * are scheduled to run on the same CPU.
3768                  */
3769                 iscsit_thread_check_cpumask(conn, current, 0);
3770
3771                 memset(buffer, 0, ISCSI_HDR_LEN);
3772                 memset(&iov, 0, sizeof(struct kvec));
3773
3774                 iov.iov_base    = buffer;
3775                 iov.iov_len     = ISCSI_HDR_LEN;
3776
3777                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3778                 if (ret != ISCSI_HDR_LEN) {
3779                         iscsit_rx_thread_wait_for_tcp(conn);
3780                         goto transport_err;
3781                 }
3782
3783                 /*
3784                  * Set conn->bad_hdr for use with REJECT PDUs.
3785                  */
3786                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3787
3788                 if (conn->conn_ops->HeaderDigest) {
3789                         iov.iov_base    = &digest;
3790                         iov.iov_len     = ISCSI_CRC_LEN;
3791
3792                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3793                         if (ret != ISCSI_CRC_LEN) {
3794                                 iscsit_rx_thread_wait_for_tcp(conn);
3795                                 goto transport_err;
3796                         }
3797
3798                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3799                                         buffer, ISCSI_HDR_LEN,
3800                                         0, NULL, (u8 *)&checksum);
3801
3802                         if (digest != checksum) {
3803                                 pr_err("HeaderDigest CRC32C failed,"
3804                                         " received 0x%08x, computed 0x%08x\n",
3805                                         digest, checksum);
3806                                 /*
3807                                  * Set the PDU to 0xff so it will intentionally
3808                                  * hit default in the switch below.
3809                                  */
3810                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3811                                 spin_lock_bh(&conn->sess->session_stats_lock);
3812                                 conn->sess->conn_digest_errors++;
3813                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3814                         } else {
3815                                 pr_debug("Got HeaderDigest CRC32C"
3816                                                 " 0x%08x\n", checksum);
3817                         }
3818                 }
3819
3820                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3821                         goto transport_err;
3822
3823                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3824
3825                 if (conn->sess->sess_ops->SessionType &&
3826                    ((!(opcode & ISCSI_OP_TEXT)) ||
3827                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3828                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3829                         " while in Discovery Session, rejecting.\n", opcode);
3830                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3831                                         buffer, conn);
3832                         goto transport_err;
3833                 }
3834
3835                 switch (opcode) {
3836                 case ISCSI_OP_SCSI_CMD:
3837                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3838                                 goto transport_err;
3839                         break;
3840                 case ISCSI_OP_SCSI_DATA_OUT:
3841                         if (iscsit_handle_data_out(conn, buffer) < 0)
3842                                 goto transport_err;
3843                         break;
3844                 case ISCSI_OP_NOOP_OUT:
3845                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3846                                 goto transport_err;
3847                         break;
3848                 case ISCSI_OP_SCSI_TMFUNC:
3849                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3850                                 goto transport_err;
3851                         break;
3852                 case ISCSI_OP_TEXT:
3853                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3854                                 goto transport_err;
3855                         break;
3856                 case ISCSI_OP_LOGOUT:
3857                         ret = iscsit_handle_logout_cmd(conn, buffer);
3858                         if (ret > 0) {
3859                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3860                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3861                                 goto transport_err;
3862                         } else if (ret < 0)
3863                                 goto transport_err;
3864                         break;
3865                 case ISCSI_OP_SNACK:
3866                         if (iscsit_handle_snack(conn, buffer) < 0)
3867                                 goto transport_err;
3868                         break;
3869                 default:
3870                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3871                                         opcode);
3872                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3873                                 pr_err("Cannot recover from unknown"
3874                                 " opcode while ERL=0, closing iSCSI connection"
3875                                 ".\n");
3876                                 goto transport_err;
3877                         }
3878                         if (!conn->conn_ops->OFMarker) {
3879                                 pr_err("Unable to recover from unknown"
3880                                 " opcode while OFMarker=No, closing iSCSI"
3881                                         " connection.\n");
3882                                 goto transport_err;
3883                         }
3884                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3885                                 pr_err("Unable to recover from unknown"
3886                                         " opcode, closing iSCSI connection.\n");
3887                                 goto transport_err;
3888                         }
3889                         break;
3890                 }
3891         }
3892
3893 transport_err:
3894         if (!signal_pending(current))
3895                 atomic_set(&conn->transport_failed, 1);
3896         iscsit_take_action_for_connection_exit(conn);
3897         goto restart;
3898 out:
3899         return 0;
3900 }
3901
3902 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3903 {
3904         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3905         struct iscsi_session *sess = conn->sess;
3906         /*
3907          * We expect this function to only ever be called from either RX or TX
3908          * thread context via iscsit_close_connection() once the other context
3909          * has been reset -> returned sleeping pre-handler state.
3910          */
3911         spin_lock_bh(&conn->cmd_lock);
3912         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3913
3914                 list_del(&cmd->i_conn_node);
3915                 spin_unlock_bh(&conn->cmd_lock);
3916
3917                 iscsit_increment_maxcmdsn(cmd, sess);
3918
3919                 iscsit_free_cmd(cmd);
3920
3921                 spin_lock_bh(&conn->cmd_lock);
3922         }
3923         spin_unlock_bh(&conn->cmd_lock);
3924 }
3925
3926 static void iscsit_stop_timers_for_cmds(
3927         struct iscsi_conn *conn)
3928 {
3929         struct iscsi_cmd *cmd;
3930
3931         spin_lock_bh(&conn->cmd_lock);
3932         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3933                 if (cmd->data_direction == DMA_TO_DEVICE)
3934                         iscsit_stop_dataout_timer(cmd);
3935         }
3936         spin_unlock_bh(&conn->cmd_lock);
3937 }
3938
3939 int iscsit_close_connection(
3940         struct iscsi_conn *conn)
3941 {
3942         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3943         struct iscsi_session    *sess = conn->sess;
3944
3945         pr_debug("Closing iSCSI connection CID %hu on SID:"
3946                 " %u\n", conn->cid, sess->sid);
3947         /*
3948          * Always up conn_logout_comp just in case the RX Thread is sleeping
3949          * and the logout response never got sent because the connection
3950          * failed.
3951          */
3952         complete(&conn->conn_logout_comp);
3953
3954         iscsi_release_thread_set(conn);
3955
3956         iscsit_stop_timers_for_cmds(conn);
3957         iscsit_stop_nopin_response_timer(conn);
3958         iscsit_stop_nopin_timer(conn);
3959         iscsit_free_queue_reqs_for_conn(conn);
3960
3961         /*
3962          * During Connection recovery drop unacknowledged out of order
3963          * commands for this connection, and prepare the other commands
3964          * for realligence.
3965          *
3966          * During normal operation clear the out of order commands (but
3967          * do not free the struct iscsi_ooo_cmdsn's) and release all
3968          * struct iscsi_cmds.
3969          */
3970         if (atomic_read(&conn->connection_recovery)) {
3971                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3972                 iscsit_prepare_cmds_for_realligance(conn);
3973         } else {
3974                 iscsit_clear_ooo_cmdsns_for_conn(conn);
3975                 iscsit_release_commands_from_conn(conn);
3976         }
3977
3978         /*
3979          * Handle decrementing session or connection usage count if
3980          * a logout response was not able to be sent because the
3981          * connection failed.  Fall back to Session Recovery here.
3982          */
3983         if (atomic_read(&conn->conn_logout_remove)) {
3984                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3985                         iscsit_dec_conn_usage_count(conn);
3986                         iscsit_dec_session_usage_count(sess);
3987                 }
3988                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3989                         iscsit_dec_conn_usage_count(conn);
3990
3991                 atomic_set(&conn->conn_logout_remove, 0);
3992                 atomic_set(&sess->session_reinstatement, 0);
3993                 atomic_set(&sess->session_fall_back_to_erl0, 1);
3994         }
3995
3996         spin_lock_bh(&sess->conn_lock);
3997         list_del(&conn->conn_list);
3998
3999         /*
4000          * Attempt to let the Initiator know this connection failed by
4001          * sending an Connection Dropped Async Message on another
4002          * active connection.
4003          */
4004         if (atomic_read(&conn->connection_recovery))
4005                 iscsit_build_conn_drop_async_message(conn);
4006
4007         spin_unlock_bh(&sess->conn_lock);
4008
4009         /*
4010          * If connection reinstatement is being performed on this connection,
4011          * up the connection reinstatement semaphore that is being blocked on
4012          * in iscsit_cause_connection_reinstatement().
4013          */
4014         spin_lock_bh(&conn->state_lock);
4015         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4016                 spin_unlock_bh(&conn->state_lock);
4017                 complete(&conn->conn_wait_comp);
4018                 wait_for_completion(&conn->conn_post_wait_comp);
4019                 spin_lock_bh(&conn->state_lock);
4020         }
4021
4022         /*
4023          * If connection reinstatement is being performed on this connection
4024          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4025          * connection wait rcfr semaphore that is being blocked on
4026          * an iscsit_connection_reinstatement_rcfr().
4027          */
4028         if (atomic_read(&conn->connection_wait_rcfr)) {
4029                 spin_unlock_bh(&conn->state_lock);
4030                 complete(&conn->conn_wait_rcfr_comp);
4031                 wait_for_completion(&conn->conn_post_wait_comp);
4032                 spin_lock_bh(&conn->state_lock);
4033         }
4034         atomic_set(&conn->connection_reinstatement, 1);
4035         spin_unlock_bh(&conn->state_lock);
4036
4037         /*
4038          * If any other processes are accessing this connection pointer we
4039          * must wait until they have completed.
4040          */
4041         iscsit_check_conn_usage_count(conn);
4042
4043         if (conn->conn_rx_hash.tfm)
4044                 crypto_free_hash(conn->conn_rx_hash.tfm);
4045         if (conn->conn_tx_hash.tfm)
4046                 crypto_free_hash(conn->conn_tx_hash.tfm);
4047
4048         if (conn->conn_cpumask)
4049                 free_cpumask_var(conn->conn_cpumask);
4050
4051         kfree(conn->conn_ops);
4052         conn->conn_ops = NULL;
4053
4054         if (conn->sock)
4055                 sock_release(conn->sock);
4056         conn->thread_set = NULL;
4057
4058         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4059         conn->conn_state = TARG_CONN_STATE_FREE;
4060         kfree(conn);
4061
4062         spin_lock_bh(&sess->conn_lock);
4063         atomic_dec(&sess->nconn);
4064         pr_debug("Decremented iSCSI connection count to %hu from node:"
4065                 " %s\n", atomic_read(&sess->nconn),
4066                 sess->sess_ops->InitiatorName);
4067         /*
4068          * Make sure that if one connection fails in an non ERL=2 iSCSI
4069          * Session that they all fail.
4070          */
4071         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4072              !atomic_read(&sess->session_logout))
4073                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4074
4075         /*
4076          * If this was not the last connection in the session, and we are
4077          * performing session reinstatement or falling back to ERL=0, call
4078          * iscsit_stop_session() without sleeping to shutdown the other
4079          * active connections.
4080          */
4081         if (atomic_read(&sess->nconn)) {
4082                 if (!atomic_read(&sess->session_reinstatement) &&
4083                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4084                         spin_unlock_bh(&sess->conn_lock);
4085                         return 0;
4086                 }
4087                 if (!atomic_read(&sess->session_stop_active)) {
4088                         atomic_set(&sess->session_stop_active, 1);
4089                         spin_unlock_bh(&sess->conn_lock);
4090                         iscsit_stop_session(sess, 0, 0);
4091                         return 0;
4092                 }
4093                 spin_unlock_bh(&sess->conn_lock);
4094                 return 0;
4095         }
4096
4097         /*
4098          * If this was the last connection in the session and one of the
4099          * following is occurring:
4100          *
4101          * Session Reinstatement is not being performed, and are falling back
4102          * to ERL=0 call iscsit_close_session().
4103          *
4104          * Session Logout was requested.  iscsit_close_session() will be called
4105          * elsewhere.
4106          *
4107          * Session Continuation is not being performed, start the Time2Retain
4108          * handler and check if sleep_on_sess_wait_sem is active.
4109          */
4110         if (!atomic_read(&sess->session_reinstatement) &&
4111              atomic_read(&sess->session_fall_back_to_erl0)) {
4112                 spin_unlock_bh(&sess->conn_lock);
4113                 target_put_session(sess->se_sess);
4114
4115                 return 0;
4116         } else if (atomic_read(&sess->session_logout)) {
4117                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4118                 sess->session_state = TARG_SESS_STATE_FREE;
4119                 spin_unlock_bh(&sess->conn_lock);
4120
4121                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4122                         complete(&sess->session_wait_comp);
4123
4124                 return 0;
4125         } else {
4126                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4127                 sess->session_state = TARG_SESS_STATE_FAILED;
4128
4129                 if (!atomic_read(&sess->session_continuation)) {
4130                         spin_unlock_bh(&sess->conn_lock);
4131                         iscsit_start_time2retain_handler(sess);
4132                 } else
4133                         spin_unlock_bh(&sess->conn_lock);
4134
4135                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4136                         complete(&sess->session_wait_comp);
4137
4138                 return 0;
4139         }
4140         spin_unlock_bh(&sess->conn_lock);
4141
4142         return 0;
4143 }
4144
4145 int iscsit_close_session(struct iscsi_session *sess)
4146 {
4147         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4148         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4149
4150         if (atomic_read(&sess->nconn)) {
4151                 pr_err("%d connection(s) still exist for iSCSI session"
4152                         " to %s\n", atomic_read(&sess->nconn),
4153                         sess->sess_ops->InitiatorName);
4154                 BUG();
4155         }
4156
4157         spin_lock_bh(&se_tpg->session_lock);
4158         atomic_set(&sess->session_logout, 1);
4159         atomic_set(&sess->session_reinstatement, 1);
4160         iscsit_stop_time2retain_timer(sess);
4161         spin_unlock_bh(&se_tpg->session_lock);
4162
4163         /*
4164          * transport_deregister_session_configfs() will clear the
4165          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4166          * can be setting it again with __transport_register_session() in
4167          * iscsi_post_login_handler() again after the iscsit_stop_session()
4168          * completes in iscsi_np context.
4169          */
4170         transport_deregister_session_configfs(sess->se_sess);
4171
4172         /*
4173          * If any other processes are accessing this session pointer we must
4174          * wait until they have completed.  If we are in an interrupt (the
4175          * time2retain handler) and contain and active session usage count we
4176          * restart the timer and exit.
4177          */
4178         if (!in_interrupt()) {
4179                 if (iscsit_check_session_usage_count(sess) == 1)
4180                         iscsit_stop_session(sess, 1, 1);
4181         } else {
4182                 if (iscsit_check_session_usage_count(sess) == 2) {
4183                         atomic_set(&sess->session_logout, 0);
4184                         iscsit_start_time2retain_handler(sess);
4185                         return 0;
4186                 }
4187         }
4188
4189         transport_deregister_session(sess->se_sess);
4190
4191         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4192                 iscsit_free_connection_recovery_entires(sess);
4193
4194         iscsit_free_all_ooo_cmdsns(sess);
4195
4196         spin_lock_bh(&se_tpg->session_lock);
4197         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4198         sess->session_state = TARG_SESS_STATE_FREE;
4199         pr_debug("Released iSCSI session from node: %s\n",
4200                         sess->sess_ops->InitiatorName);
4201         tpg->nsessions--;
4202         if (tpg->tpg_tiqn)
4203                 tpg->tpg_tiqn->tiqn_nsessions--;
4204
4205         pr_debug("Decremented number of active iSCSI Sessions on"
4206                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4207
4208         spin_lock(&sess_idr_lock);
4209         idr_remove(&sess_idr, sess->session_index);
4210         spin_unlock(&sess_idr_lock);
4211
4212         kfree(sess->sess_ops);
4213         sess->sess_ops = NULL;
4214         spin_unlock_bh(&se_tpg->session_lock);
4215
4216         kfree(sess);
4217         return 0;
4218 }
4219
4220 static void iscsit_logout_post_handler_closesession(
4221         struct iscsi_conn *conn)
4222 {
4223         struct iscsi_session *sess = conn->sess;
4224
4225         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4226         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4227
4228         atomic_set(&conn->conn_logout_remove, 0);
4229         complete(&conn->conn_logout_comp);
4230
4231         iscsit_dec_conn_usage_count(conn);
4232         iscsit_stop_session(sess, 1, 1);
4233         iscsit_dec_session_usage_count(sess);
4234         target_put_session(sess->se_sess);
4235 }
4236
4237 static void iscsit_logout_post_handler_samecid(
4238         struct iscsi_conn *conn)
4239 {
4240         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4241         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4242
4243         atomic_set(&conn->conn_logout_remove, 0);
4244         complete(&conn->conn_logout_comp);
4245
4246         iscsit_cause_connection_reinstatement(conn, 1);
4247         iscsit_dec_conn_usage_count(conn);
4248 }
4249
4250 static void iscsit_logout_post_handler_diffcid(
4251         struct iscsi_conn *conn,
4252         u16 cid)
4253 {
4254         struct iscsi_conn *l_conn;
4255         struct iscsi_session *sess = conn->sess;
4256
4257         if (!sess)
4258                 return;
4259
4260         spin_lock_bh(&sess->conn_lock);
4261         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4262                 if (l_conn->cid == cid) {
4263                         iscsit_inc_conn_usage_count(l_conn);
4264                         break;
4265                 }
4266         }
4267         spin_unlock_bh(&sess->conn_lock);
4268
4269         if (!l_conn)
4270                 return;
4271
4272         if (l_conn->sock)
4273                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4274
4275         spin_lock_bh(&l_conn->state_lock);
4276         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4277         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4278         spin_unlock_bh(&l_conn->state_lock);
4279
4280         iscsit_cause_connection_reinstatement(l_conn, 1);
4281         iscsit_dec_conn_usage_count(l_conn);
4282 }
4283
4284 /*
4285  *      Return of 0 causes the TX thread to restart.
4286  */
4287 static int iscsit_logout_post_handler(
4288         struct iscsi_cmd *cmd,
4289         struct iscsi_conn *conn)
4290 {
4291         int ret = 0;
4292
4293         switch (cmd->logout_reason) {
4294         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4295                 switch (cmd->logout_response) {
4296                 case ISCSI_LOGOUT_SUCCESS:
4297                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4298                 default:
4299                         iscsit_logout_post_handler_closesession(conn);
4300                         break;
4301                 }
4302                 ret = 0;
4303                 break;
4304         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4305                 if (conn->cid == cmd->logout_cid) {
4306                         switch (cmd->logout_response) {
4307                         case ISCSI_LOGOUT_SUCCESS:
4308                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4309                         default:
4310                                 iscsit_logout_post_handler_samecid(conn);
4311                                 break;
4312                         }
4313                         ret = 0;
4314                 } else {
4315                         switch (cmd->logout_response) {
4316                         case ISCSI_LOGOUT_SUCCESS:
4317                                 iscsit_logout_post_handler_diffcid(conn,
4318                                         cmd->logout_cid);
4319                                 break;
4320                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4321                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4322                         default:
4323                                 break;
4324                         }
4325                         ret = 1;
4326                 }
4327                 break;
4328         case ISCSI_LOGOUT_REASON_RECOVERY:
4329                 switch (cmd->logout_response) {
4330                 case ISCSI_LOGOUT_SUCCESS:
4331                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4332                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4333                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4334                 default:
4335                         break;
4336                 }
4337                 ret = 1;
4338                 break;
4339         default:
4340                 break;
4341
4342         }
4343         return ret;
4344 }
4345
4346 void iscsit_fail_session(struct iscsi_session *sess)
4347 {
4348         struct iscsi_conn *conn;
4349
4350         spin_lock_bh(&sess->conn_lock);
4351         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4352                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4353                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4354         }
4355         spin_unlock_bh(&sess->conn_lock);
4356
4357         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4358         sess->session_state = TARG_SESS_STATE_FAILED;
4359 }
4360
4361 int iscsit_free_session(struct iscsi_session *sess)
4362 {
4363         u16 conn_count = atomic_read(&sess->nconn);
4364         struct iscsi_conn *conn, *conn_tmp = NULL;
4365         int is_last;
4366
4367         spin_lock_bh(&sess->conn_lock);
4368         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4369
4370         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4371                         conn_list) {
4372                 if (conn_count == 0)
4373                         break;
4374
4375                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4376                         is_last = 1;
4377                 } else {
4378                         iscsit_inc_conn_usage_count(conn_tmp);
4379                         is_last = 0;
4380                 }
4381                 iscsit_inc_conn_usage_count(conn);
4382
4383                 spin_unlock_bh(&sess->conn_lock);
4384                 iscsit_cause_connection_reinstatement(conn, 1);
4385                 spin_lock_bh(&sess->conn_lock);
4386
4387                 iscsit_dec_conn_usage_count(conn);
4388                 if (is_last == 0)
4389                         iscsit_dec_conn_usage_count(conn_tmp);
4390
4391                 conn_count--;
4392         }
4393
4394         if (atomic_read(&sess->nconn)) {
4395                 spin_unlock_bh(&sess->conn_lock);
4396                 wait_for_completion(&sess->session_wait_comp);
4397         } else
4398                 spin_unlock_bh(&sess->conn_lock);
4399
4400         target_put_session(sess->se_sess);
4401         return 0;
4402 }
4403
4404 void iscsit_stop_session(
4405         struct iscsi_session *sess,
4406         int session_sleep,
4407         int connection_sleep)
4408 {
4409         u16 conn_count = atomic_read(&sess->nconn);
4410         struct iscsi_conn *conn, *conn_tmp = NULL;
4411         int is_last;
4412
4413         spin_lock_bh(&sess->conn_lock);
4414         if (session_sleep)
4415                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4416
4417         if (connection_sleep) {
4418                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4419                                 conn_list) {
4420                         if (conn_count == 0)
4421                                 break;
4422
4423                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4424                                 is_last = 1;
4425                         } else {
4426                                 iscsit_inc_conn_usage_count(conn_tmp);
4427                                 is_last = 0;
4428                         }
4429                         iscsit_inc_conn_usage_count(conn);
4430
4431                         spin_unlock_bh(&sess->conn_lock);
4432                         iscsit_cause_connection_reinstatement(conn, 1);
4433                         spin_lock_bh(&sess->conn_lock);
4434
4435                         iscsit_dec_conn_usage_count(conn);
4436                         if (is_last == 0)
4437                                 iscsit_dec_conn_usage_count(conn_tmp);
4438                         conn_count--;
4439                 }
4440         } else {
4441                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4442                         iscsit_cause_connection_reinstatement(conn, 0);
4443         }
4444
4445         if (session_sleep && atomic_read(&sess->nconn)) {
4446                 spin_unlock_bh(&sess->conn_lock);
4447                 wait_for_completion(&sess->session_wait_comp);
4448         } else
4449                 spin_unlock_bh(&sess->conn_lock);
4450 }
4451
4452 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4453 {
4454         struct iscsi_session *sess;
4455         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4456         struct se_session *se_sess, *se_sess_tmp;
4457         int session_count = 0;
4458
4459         spin_lock_bh(&se_tpg->session_lock);
4460         if (tpg->nsessions && !force) {
4461                 spin_unlock_bh(&se_tpg->session_lock);
4462                 return -1;
4463         }
4464
4465         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4466                         sess_list) {
4467                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4468
4469                 spin_lock(&sess->conn_lock);
4470                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4471                     atomic_read(&sess->session_logout) ||
4472                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4473                         spin_unlock(&sess->conn_lock);
4474                         continue;
4475                 }
4476                 atomic_set(&sess->session_reinstatement, 1);
4477                 spin_unlock(&sess->conn_lock);
4478                 spin_unlock_bh(&se_tpg->session_lock);
4479
4480                 iscsit_free_session(sess);
4481                 spin_lock_bh(&se_tpg->session_lock);
4482
4483                 session_count++;
4484         }
4485         spin_unlock_bh(&se_tpg->session_lock);
4486
4487         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4488                         " Group: %hu\n", session_count, tpg->tpgt);
4489         return 0;
4490 }
4491
4492 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4493 MODULE_VERSION("4.1.x");
4494 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4495 MODULE_LICENSE("GPL");
4496
4497 module_init(iscsi_target_init_module);
4498 module_exit(iscsi_target_cleanup_module);