drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_device.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_tmr.h>
  31 #include <target/target_core_transport.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_SPINLOCK(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_cmd_cache;
  63 struct kmem_cache *lio_qr_cache;
  64 struct kmem_cache *lio_dr_cache;
  65 struct kmem_cache *lio_ooo_cache;
  66 struct kmem_cache *lio_r2t_cache;
  67
  68 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  69                         unsigned char *buf, u32);
  70 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 146                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 147                 kfree(tiqn);
 148                 return ERR_PTR(-ENOMEM);
 149         }
 150         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 151
 152         spin_lock(&tiqn_lock);
 153         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 154         if (ret < 0) {
 155                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 kfree(tiqn);
 158                 return ERR_PTR(ret);
 159         }
 160         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 161         spin_unlock(&tiqn_lock);
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         if (np->np_login_tpg) {
 220                 pr_err("np->np_login_tpg() is not NULL!\n");
 221                 spin_unlock_bh(&np->np_thread_lock);
 222                 return -1;
 223         }
 224         spin_unlock_bh(&np->np_thread_lock);
 225         /*
 226          * Determine if the portal group is accepting storage traffic.
 227          */
 228         spin_lock_bh(&tpg->tpg_state_lock);
 229         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 230                 spin_unlock_bh(&tpg->tpg_state_lock);
 231                 return -1;
 232         }
 233         spin_unlock_bh(&tpg->tpg_state_lock);
 234
 235         /*
 236          * Here we serialize access across the TIQN+TPG Tuple.
 237          */
 238         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 239         if ((ret != 0) || signal_pending(current))
 240                 return -1;
 241
 242         spin_lock_bh(&np->np_thread_lock);
 243         np->np_login_tpg = tpg;
 244         spin_unlock_bh(&np->np_thread_lock);
 245
 246         return 0;
 247 }
 248
 249 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 250 {
 251         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 252
 253         spin_lock_bh(&np->np_thread_lock);
 254         np->np_login_tpg = NULL;
 255         spin_unlock_bh(&np->np_thread_lock);
 256
 257         mutex_unlock(&tpg->np_login_lock);
 258
 259         if (tiqn)
 260                 iscsit_put_tiqn_for_login(tiqn);
 261
 262         return 0;
 263 }
 264
 265 static struct iscsi_np *iscsit_get_np(
 266         struct __kernel_sockaddr_storage *sockaddr,
 267         int network_transport)
 268 {
 269         struct sockaddr_in *sock_in, *sock_in_e;
 270         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 271         struct iscsi_np *np;
 272         int ip_match = 0;
 273         u16 port;
 274
 275         spin_lock_bh(&np_lock);
 276         list_for_each_entry(np, &g_np_list, np_list) {
 277                 spin_lock(&np->np_thread_lock);
 278                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 279                         spin_unlock(&np->np_thread_lock);
 280                         continue;
 281                 }
 282
 283                 if (sockaddr->ss_family == AF_INET6) {
 284                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                         if (!memcmp((void *)&sock_in6->sin6_addr.in6_u,
 288                                     (void *)&sock_in6_e->sin6_addr.in6_u,
 289                                     sizeof(struct in6_addr)))
 290                                 ip_match = 1;
 291
 292                         port = ntohs(sock_in6->sin6_port);
 293                 } else {
 294                         sock_in = (struct sockaddr_in *)sockaddr;
 295                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                         if (sock_in->sin_addr.s_addr ==
 298                             sock_in_e->sin_addr.s_addr)
 299                                 ip_match = 1;
 300
 301                         port = ntohs(sock_in->sin_port);
 302                 }
 303
 304                 if ((ip_match == 1) && (np->np_port == port) &&
 305                     (np->np_network_transport == network_transport)) {
 306                         /*
 307                          * Increment the np_exports reference count now to
 308                          * prevent iscsit_del_np() below from being called
 309                          * while iscsi_tpg_add_network_portal() is called.
 310                          */
 311                         np->np_exports++;
 312                         spin_unlock(&np->np_thread_lock);
 313                         spin_unlock_bh(&np_lock);
 314                         return np;
 315                 }
 316                 spin_unlock(&np->np_thread_lock);
 317         }
 318         spin_unlock_bh(&np_lock);
 319
 320         return NULL;
 321 }
 322
 323 struct iscsi_np *iscsit_add_np(
 324         struct __kernel_sockaddr_storage *sockaddr,
 325         char *ip_str,
 326         int network_transport)
 327 {
 328         struct sockaddr_in *sock_in;
 329         struct sockaddr_in6 *sock_in6;
 330         struct iscsi_np *np;
 331         int ret;
 332         /*
 333          * Locate the existing struct iscsi_np if already active..
 334          */
 335         np = iscsit_get_np(sockaddr, network_transport);
 336         if (np)
 337                 return np;
 338
 339         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 340         if (!np) {
 341                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 342                 return ERR_PTR(-ENOMEM);
 343         }
 344
 345         np->np_flags |= NPF_IP_NETWORK;
 346         if (sockaddr->ss_family == AF_INET6) {
 347                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 348                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 349                 np->np_port = ntohs(sock_in6->sin6_port);
 350         } else {
 351                 sock_in = (struct sockaddr_in *)sockaddr;
 352                 sprintf(np->np_ip, "%s", ip_str);
 353                 np->np_port = ntohs(sock_in->sin_port);
 354         }
 355
 356         np->np_network_transport = network_transport;
 357         spin_lock_init(&np->np_thread_lock);
 358         init_completion(&np->np_restart_comp);
 359         INIT_LIST_HEAD(&np->np_list);
 360
 361         ret = iscsi_target_setup_login_socket(np, sockaddr);
 362         if (ret != 0) {
 363                 kfree(np);
 364                 return ERR_PTR(ret);
 365         }
 366
 367         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 368         if (IS_ERR(np->np_thread)) {
 369                 pr_err("Unable to create kthread: iscsi_np\n");
 370                 ret = PTR_ERR(np->np_thread);
 371                 kfree(np);
 372                 return ERR_PTR(ret);
 373         }
 374         /*
 375          * Increment the np_exports reference count now to prevent
 376          * iscsit_del_np() below from being run while a new call to
 377          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 378          * active.  We don't need to hold np->np_thread_lock at this
 379          * point because iscsi_np has not been added to g_np_list yet.
 380          */
 381         np->np_exports = 1;
 382
 383         spin_lock_bh(&np_lock);
 384         list_add_tail(&np->np_list, &g_np_list);
 385         spin_unlock_bh(&np_lock);
 386
 387         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 388                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 389                 "TCP" : "SCTP");
 390
 391         return np;
 392 }
 393
 394 int iscsit_reset_np_thread(
 395         struct iscsi_np *np,
 396         struct iscsi_tpg_np *tpg_np,
 397         struct iscsi_portal_group *tpg)
 398 {
 399         spin_lock_bh(&np->np_thread_lock);
 400         if (tpg && tpg_np) {
 401                 /*
 402                  * The reset operation need only be performed when the
 403                  * passed struct iscsi_portal_group has a login in progress
 404                  * to one of the network portals.
 405                  */
 406                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 407                         spin_unlock_bh(&np->np_thread_lock);
 408                         return 0;
 409                 }
 410         }
 411         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 412                 spin_unlock_bh(&np->np_thread_lock);
 413                 return 0;
 414         }
 415         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 416
 417         if (np->np_thread) {
 418                 spin_unlock_bh(&np->np_thread_lock);
 419                 send_sig(SIGINT, np->np_thread, 1);
 420                 wait_for_completion(&np->np_restart_comp);
 421                 spin_lock_bh(&np->np_thread_lock);
 422         }
 423         spin_unlock_bh(&np->np_thread_lock);
 424
 425         return 0;
 426 }
 427
 428 int iscsit_del_np_comm(struct iscsi_np *np)
 429 {
 430         if (!np->np_socket)
 431                 return 0;
 432
 433         /*
 434          * Some network transports allocate their own struct sock->file,
 435          * see  if we need to free any additional allocated resources.
 436          */
 437         if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
 438                 kfree(np->np_socket->file);
 439                 np->np_socket->file = NULL;
 440         }
 441
 442         sock_release(np->np_socket);
 443         return 0;
 444 }
 445
 446 int iscsit_del_np(struct iscsi_np *np)
 447 {
 448         spin_lock_bh(&np->np_thread_lock);
 449         np->np_exports--;
 450         if (np->np_exports) {
 451                 spin_unlock_bh(&np->np_thread_lock);
 452                 return 0;
 453         }
 454         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 455         spin_unlock_bh(&np->np_thread_lock);
 456
 457         if (np->np_thread) {
 458                 /*
 459                  * We need to send the signal to wakeup Linux/Net
 460                  * which may be sleeping in sock_accept()..
 461                  */
 462                 send_sig(SIGINT, np->np_thread, 1);
 463                 kthread_stop(np->np_thread);
 464         }
 465         iscsit_del_np_comm(np);
 466
 467         spin_lock_bh(&np_lock);
 468         list_del(&np->np_list);
 469         spin_unlock_bh(&np_lock);
 470
 471         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 472                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 473                 "TCP" : "SCTP");
 474
 475         kfree(np);
 476         return 0;
 477 }
 478
 479 static int __init iscsi_target_init_module(void)
 480 {
 481         int ret = 0;
 482
 483         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 484
 485         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 486         if (!iscsit_global) {
 487                 pr_err("Unable to allocate memory for iscsit_global\n");
 488                 return -1;
 489         }
 490         mutex_init(&auth_id_lock);
 491         spin_lock_init(&sess_idr_lock);
 492         idr_init(&tiqn_idr);
 493         idr_init(&sess_idr);
 494
 495         ret = iscsi_target_register_configfs();
 496         if (ret < 0)
 497                 goto out;
 498
 499         ret = iscsi_thread_set_init();
 500         if (ret < 0)
 501                 goto configfs_out;
 502
 503         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 504                         TARGET_THREAD_SET_COUNT) {
 505                 pr_err("iscsi_allocate_thread_sets() returned"
 506                         " unexpected value!\n");
 507                 goto ts_out1;
 508         }
 509
 510         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 511                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 512                         0, NULL);
 513         if (!lio_cmd_cache) {
 514                 pr_err("Unable to kmem_cache_create() for"
 515                                 " lio_cmd_cache\n");
 516                 goto ts_out2;
 517         }
 518
 519         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 520                         sizeof(struct iscsi_queue_req),
 521                         __alignof__(struct iscsi_queue_req), 0, NULL);
 522         if (!lio_qr_cache) {
 523                 pr_err("nable to kmem_cache_create() for"
 524                                 " lio_qr_cache\n");
 525                 goto cmd_out;
 526         }
 527
 528         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 529                         sizeof(struct iscsi_datain_req),
 530                         __alignof__(struct iscsi_datain_req), 0, NULL);
 531         if (!lio_dr_cache) {
 532                 pr_err("Unable to kmem_cache_create() for"
 533                                 " lio_dr_cache\n");
 534                 goto qr_out;
 535         }
 536
 537         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 538                         sizeof(struct iscsi_ooo_cmdsn),
 539                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 540         if (!lio_ooo_cache) {
 541                 pr_err("Unable to kmem_cache_create() for"
 542                                 " lio_ooo_cache\n");
 543                 goto dr_out;
 544         }
 545
 546         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 547                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 548                         0, NULL);
 549         if (!lio_r2t_cache) {
 550                 pr_err("Unable to kmem_cache_create() for"
 551                                 " lio_r2t_cache\n");
 552                 goto ooo_out;
 553         }
 554
 555         if (iscsit_load_discovery_tpg() < 0)
 556                 goto r2t_out;
 557
 558         return ret;
 559 r2t_out:
 560         kmem_cache_destroy(lio_r2t_cache);
 561 ooo_out:
 562         kmem_cache_destroy(lio_ooo_cache);
 563 dr_out:
 564         kmem_cache_destroy(lio_dr_cache);
 565 qr_out:
 566         kmem_cache_destroy(lio_qr_cache);
 567 cmd_out:
 568         kmem_cache_destroy(lio_cmd_cache);
 569 ts_out2:
 570         iscsi_deallocate_thread_sets();
 571 ts_out1:
 572         iscsi_thread_set_free();
 573 configfs_out:
 574         iscsi_target_deregister_configfs();
 575 out:
 576         kfree(iscsit_global);
 577         return -ENOMEM;
 578 }
 579
 580 static void __exit iscsi_target_cleanup_module(void)
 581 {
 582         iscsi_deallocate_thread_sets();
 583         iscsi_thread_set_free();
 584         iscsit_release_discovery_tpg();
 585         kmem_cache_destroy(lio_cmd_cache);
 586         kmem_cache_destroy(lio_qr_cache);
 587         kmem_cache_destroy(lio_dr_cache);
 588         kmem_cache_destroy(lio_ooo_cache);
 589         kmem_cache_destroy(lio_r2t_cache);
 590
 591         iscsi_target_deregister_configfs();
 592
 593         kfree(iscsit_global);
 594 }
 595
 596 int iscsit_add_reject(
 597         u8 reason,
 598         int fail_conn,
 599         unsigned char *buf,
 600         struct iscsi_conn *conn)
 601 {
 602         struct iscsi_cmd *cmd;
 603         struct iscsi_reject *hdr;
 604         int ret;
 605
 606         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 607         if (!cmd)
 608                 return -1;
 609
 610         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 611         if (fail_conn)
 612                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 613
 614         hdr     = (struct iscsi_reject *) cmd->pdu;
 615         hdr->reason = reason;
 616
 617         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 618         if (!cmd->buf_ptr) {
 619                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 620                 iscsit_release_cmd(cmd);
 621                 return -1;
 622         }
 623
 624         spin_lock_bh(&conn->cmd_lock);
 625         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 626         spin_unlock_bh(&conn->cmd_lock);
 627
 628         cmd->i_state = ISTATE_SEND_REJECT;
 629         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 630
 631         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 632         if (ret != 0)
 633                 return -1;
 634
 635         return (!fail_conn) ? 0 : -1;
 636 }
 637
 638 int iscsit_add_reject_from_cmd(
 639         u8 reason,
 640         int fail_conn,
 641         int add_to_conn,
 642         unsigned char *buf,
 643         struct iscsi_cmd *cmd)
 644 {
 645         struct iscsi_conn *conn;
 646         struct iscsi_reject *hdr;
 647         int ret;
 648
 649         if (!cmd->conn) {
 650                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 651                                 cmd->init_task_tag);
 652                 return -1;
 653         }
 654         conn = cmd->conn;
 655
 656         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 657         if (fail_conn)
 658                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 659
 660         hdr     = (struct iscsi_reject *) cmd->pdu;
 661         hdr->reason = reason;
 662
 663         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 664         if (!cmd->buf_ptr) {
 665                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 666                 iscsit_release_cmd(cmd);
 667                 return -1;
 668         }
 669
 670         if (add_to_conn) {
 671                 spin_lock_bh(&conn->cmd_lock);
 672                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
 673                 spin_unlock_bh(&conn->cmd_lock);
 674         }
 675
 676         cmd->i_state = ISTATE_SEND_REJECT;
 677         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 678
 679         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 680         if (ret != 0)
 681                 return -1;
 682
 683         return (!fail_conn) ? 0 : -1;
 684 }
 685
 686 /*
 687  * Map some portion of the allocated scatterlist to an iovec, suitable for
 688  * kernel sockets to copy data in/out. This handles both pages and slab-allocated
 689  * buffers, since we have been tricky and mapped t_mem_sg to the buffer in
 690  * either case (see iscsit_alloc_buffs)
 691  */
 692 static int iscsit_map_iovec(
 693         struct iscsi_cmd *cmd,
 694         struct kvec *iov,
 695         u32 data_offset,
 696         u32 data_length)
 697 {
 698         u32 i = 0;
 699         struct scatterlist *sg;
 700         unsigned int page_off;
 701
 702         /*
 703          * We have a private mapping of the allocated pages in t_mem_sg.
 704          * At this point, we also know each contains a page.
 705          */
 706         sg = &cmd->t_mem_sg[data_offset / PAGE_SIZE];
 707         page_off = (data_offset % PAGE_SIZE);
 708
 709         cmd->first_data_sg = sg;
 710         cmd->first_data_sg_off = page_off;
 711
 712         while (data_length) {
 713                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 714
 715                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 716                 iov[i].iov_len = cur_len;
 717
 718                 data_length -= cur_len;
 719                 page_off = 0;
 720                 sg = sg_next(sg);
 721                 i++;
 722         }
 723
 724         cmd->kmapped_nents = i;
 725
 726         return i;
 727 }
 728
 729 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 730 {
 731         u32 i;
 732         struct scatterlist *sg;
 733
 734         sg = cmd->first_data_sg;
 735
 736         for (i = 0; i < cmd->kmapped_nents; i++)
 737                 kunmap(sg_page(&sg[i]));
 738 }
 739
 740 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 741 {
 742         struct iscsi_cmd *cmd;
 743
 744         conn->exp_statsn = exp_statsn;
 745
 746         spin_lock_bh(&conn->cmd_lock);
 747         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
 748                 spin_lock(&cmd->istate_lock);
 749                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 750                     (cmd->stat_sn < exp_statsn)) {
 751                         cmd->i_state = ISTATE_REMOVE;
 752                         spin_unlock(&cmd->istate_lock);
 753                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 754                                                 cmd->i_state);
 755                         continue;
 756                 }
 757                 spin_unlock(&cmd->istate_lock);
 758         }
 759         spin_unlock_bh(&conn->cmd_lock);
 760 }
 761
 762 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 763 {
 764         u32 iov_count = (cmd->se_cmd.t_data_nents == 0) ? 1 :
 765                                 cmd->se_cmd.t_data_nents;
 766
 767         iov_count += ISCSI_IOV_DATA_BUFFER;
 768
 769         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 770         if (!cmd->iov_data) {
 771                 pr_err("Unable to allocate cmd->iov_data\n");
 772                 return -ENOMEM;
 773         }
 774
 775         cmd->orig_iov_data_count = iov_count;
 776         return 0;
 777 }
 778
 779 static int iscsit_alloc_buffs(struct iscsi_cmd *cmd)
 780 {
 781         struct scatterlist *sgl;
 782         u32 length = cmd->se_cmd.data_length;
 783         int nents = DIV_ROUND_UP(length, PAGE_SIZE);
 784         int i = 0, j = 0, ret;
 785         /*
 786          * If no SCSI payload is present, allocate the default iovecs used for
 787          * iSCSI PDU Header
 788          */
 789         if (!length)
 790                 return iscsit_allocate_iovecs(cmd);
 791
 792         sgl = kzalloc(sizeof(*sgl) * nents, GFP_KERNEL);
 793         if (!sgl)
 794                 return -ENOMEM;
 795
 796         sg_init_table(sgl, nents);
 797
 798         while (length) {
 799                 int buf_size = min_t(int, length, PAGE_SIZE);
 800                 struct page *page;
 801
 802                 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
 803                 if (!page)
 804                         goto page_alloc_failed;
 805
 806                 sg_set_page(&sgl[i], page, buf_size, 0);
 807
 808                 length -= buf_size;
 809                 i++;
 810         }
 811
 812         cmd->t_mem_sg = sgl;
 813         cmd->t_mem_sg_nents = nents;
 814
 815         /* BIDI ops not supported */
 816
 817         /* Tell the core about our preallocated memory */
 818         transport_generic_map_mem_to_cmd(&cmd->se_cmd, sgl, nents, NULL, 0);
 819         /*
 820          * Allocate iovecs for SCSI payload after transport_generic_map_mem_to_cmd
 821          * so that cmd->se_cmd.t_tasks_se_num has been set.
 822          */
 823         ret = iscsit_allocate_iovecs(cmd);
 824         if (ret < 0)
 825                 return -ENOMEM;
 826
 827         return 0;
 828
 829 page_alloc_failed:
 830         while (j < i)
 831                 __free_page(sg_page(&sgl[j++]));
 832
 833         kfree(sgl);
 834         return -ENOMEM;
 835 }
 836
 837 static int iscsit_handle_scsi_cmd(
 838         struct iscsi_conn *conn,
 839         unsigned char *buf)
 840 {
 841         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 842         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 843         struct iscsi_cmd        *cmd = NULL;
 844         struct iscsi_scsi_req *hdr;
 845
 846         spin_lock_bh(&conn->sess->session_stats_lock);
 847         conn->sess->cmd_pdus++;
 848         if (conn->sess->se_sess->se_node_acl) {
 849                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 850                 conn->sess->se_sess->se_node_acl->num_cmds++;
 851                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 852         }
 853         spin_unlock_bh(&conn->sess->session_stats_lock);
 854
 855         hdr                     = (struct iscsi_scsi_req *) buf;
 856         payload_length          = ntoh24(hdr->dlength);
 857         hdr->itt                = be32_to_cpu(hdr->itt);
 858         hdr->data_length        = be32_to_cpu(hdr->data_length);
 859         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 860         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 861
 862         /* FIXME; Add checks for AdditionalHeaderSegment */
 863
 864         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 865             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 866                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 867                                 " not set. Bad iSCSI Initiator.\n");
 868                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 869                                 buf, conn);
 870         }
 871
 872         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 873              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 874                 /*
 875                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 876                  * that adds support for RESERVE/RELEASE.  There is a bug
 877                  * add with this new functionality that sets R/W bits when
 878                  * neither CDB carries any READ or WRITE datapayloads.
 879                  */
 880                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 881                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 882                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 883                         goto done;
 884                 }
 885
 886                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 887                         " set when Expected Data Transfer Length is 0 for"
 888                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 889                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 890                                 buf, conn);
 891         }
 892 done:
 893
 894         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 895             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 896                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 897                         " MUST be set if Expected Data Transfer Length is not 0."
 898                         " Bad iSCSI Initiator\n");
 899                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 900                                 buf, conn);
 901         }
 902
 903         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 904             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 905                 pr_err("Bidirectional operations not supported!\n");
 906                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 907                                 buf, conn);
 908         }
 909
 910         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 911                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 912                                 " Scsi Command PDU.\n");
 913                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 914                                 buf, conn);
 915         }
 916
 917         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 918                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 919                         " protocol error.\n", payload_length);
 920                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 921                                 buf, conn);
 922         }
 923
 924         if ((hdr->data_length == payload_length) &&
 925             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 926                 pr_err("Expected Data Transfer Length and Length of"
 927                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 928                         " bit is not set protocol error\n");
 929                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 930                                 buf, conn);
 931         }
 932
 933         if (payload_length > hdr->data_length) {
 934                 pr_err("DataSegmentLength: %u is greater than"
 935                         " EDTL: %u, protocol error.\n", payload_length,
 936                                 hdr->data_length);
 937                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 938                                 buf, conn);
 939         }
 940
 941         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 942                 pr_err("DataSegmentLength: %u is greater than"
 943                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 944                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 945                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 946                                 buf, conn);
 947         }
 948
 949         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 950                 pr_err("DataSegmentLength: %u is greater than"
 951                         " FirstBurstLength: %u, protocol error.\n",
 952                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 953                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 954                                         buf, conn);
 955         }
 956
 957         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 958                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 959                           DMA_NONE;
 960
 961         cmd = iscsit_allocate_se_cmd(conn, hdr->data_length, data_direction,
 962                                 (hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK));
 963         if (!cmd)
 964                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 965                                         buf, conn);
 966
 967         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 968                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 969                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 970
 971         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 972         cmd->i_state            = ISTATE_NEW_CMD;
 973         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 974         cmd->immediate_data     = (payload_length) ? 1 : 0;
 975         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 976                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 977         if (cmd->unsolicited_data)
 978                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 979
 980         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 981         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 982                 spin_lock_bh(&conn->sess->ttt_lock);
 983                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 984                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 985                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 986                 spin_unlock_bh(&conn->sess->ttt_lock);
 987         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 988                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 989         cmd->cmd_sn             = hdr->cmdsn;
 990         cmd->exp_stat_sn        = hdr->exp_statsn;
 991         cmd->first_burst_len    = payload_length;
 992
 993         if (cmd->data_direction == DMA_FROM_DEVICE) {
 994                 struct iscsi_datain_req *dr;
 995
 996                 dr = iscsit_allocate_datain_req();
 997                 if (!dr)
 998                         return iscsit_add_reject_from_cmd(
 999                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1000                                         1, 1, buf, cmd);
1001
1002                 iscsit_attach_datain_req(cmd, dr);
1003         }
1004
1005         /*
1006          * The CDB is going to an se_device_t.
1007          */
1008         ret = iscsit_get_lun_for_cmd(cmd, hdr->cdb,
1009                                 get_unaligned_le64(&hdr->lun));
1010         if (ret < 0) {
1011                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
1012                         pr_debug("Responding to non-acl'ed,"
1013                                 " non-existent or non-exported iSCSI LUN:"
1014                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
1015                 }
1016                 send_check_condition = 1;
1017                 goto attach_cmd;
1018         }
1019         /*
1020          * The Initiator Node has access to the LUN (the addressing method
1021          * is handled inside of iscsit_get_lun_for_cmd()).  Now it's time to
1022          * allocate 1->N transport tasks (depending on sector count and
1023          * maximum request size the physical HBA(s) can handle.
1024          */
1025         transport_ret = transport_generic_allocate_tasks(&cmd->se_cmd, hdr->cdb);
1026         if (transport_ret == -ENOMEM) {
1027                 return iscsit_add_reject_from_cmd(
1028                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1029                                 1, 1, buf, cmd);
1030         } else if (transport_ret < 0) {
1031                 /*
1032                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
1033                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
1034                  * Mechinism.
1035                  */
1036                 send_check_condition = 1;
1037         } else {
1038                 cmd->data_length = cmd->se_cmd.data_length;
1039
1040                 if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
1041                         return iscsit_add_reject_from_cmd(
1042                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1043                                 1, 1, buf, cmd);
1044         }
1045
1046 attach_cmd:
1047         spin_lock_bh(&conn->cmd_lock);
1048         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1049         spin_unlock_bh(&conn->cmd_lock);
1050         /*
1051          * Check if we need to delay processing because of ALUA
1052          * Active/NonOptimized primary access state..
1053          */
1054         core_alua_check_nonop_delay(&cmd->se_cmd);
1055         /*
1056          * Allocate and setup SGL used with transport_generic_map_mem_to_cmd().
1057          * also call iscsit_allocate_iovecs()
1058          */
1059         ret = iscsit_alloc_buffs(cmd);
1060         if (ret < 0)
1061                 return iscsit_add_reject_from_cmd(
1062                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1063                                 1, 0, buf, cmd);
1064         /*
1065          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1066          * the Immediate Bit is not set, and no Immediate
1067          * Data is attached.
1068          *
1069          * A PDU/CmdSN carrying Immediate Data can only
1070          * be processed after the DataCRC has passed.
1071          * If the DataCRC fails, the CmdSN MUST NOT
1072          * be acknowledged. (See below)
1073          */
1074         if (!cmd->immediate_data) {
1075                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1076                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1077                         return 0;
1078                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1079                         return iscsit_add_reject_from_cmd(
1080                                 ISCSI_REASON_PROTOCOL_ERROR,
1081                                 1, 0, buf, cmd);
1082         }
1083
1084         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1085
1086         /*
1087          * If no Immediate Data is attached, it's OK to return now.
1088          */
1089         if (!cmd->immediate_data) {
1090                 if (send_check_condition)
1091                         return 0;
1092
1093                 if (cmd->unsolicited_data) {
1094                         iscsit_set_dataout_sequence_values(cmd);
1095
1096                         spin_lock_bh(&cmd->dataout_timeout_lock);
1097                         iscsit_start_dataout_timer(cmd, cmd->conn);
1098                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1099                 }
1100
1101                 return 0;
1102         }
1103
1104         /*
1105          * Early CHECK_CONDITIONs never make it to the transport processing
1106          * thread.  They are processed in CmdSN order by
1107          * iscsit_check_received_cmdsn() below.
1108          */
1109         if (send_check_condition) {
1110                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1111                 dump_immediate_data = 1;
1112                 goto after_immediate_data;
1113         }
1114         /*
1115          * Call directly into transport_generic_new_cmd() to perform
1116          * the backend memory allocation.
1117          */
1118         ret = transport_generic_new_cmd(&cmd->se_cmd);
1119         if (ret < 0) {
1120                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121                 dump_immediate_data = 1;
1122                 goto after_immediate_data;
1123         }
1124
1125         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1126 after_immediate_data:
1127         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1128                 /*
1129                  * A PDU/CmdSN carrying Immediate Data passed
1130                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1131                  * Immediate Bit is not set.
1132                  */
1133                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1134                 /*
1135                  * Special case for Unsupported SAM WRITE Opcodes
1136                  * and ImmediateData=Yes.
1137                  */
1138                 if (dump_immediate_data) {
1139                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1140                                 return -1;
1141                 } else if (cmd->unsolicited_data) {
1142                         iscsit_set_dataout_sequence_values(cmd);
1143
1144                         spin_lock_bh(&cmd->dataout_timeout_lock);
1145                         iscsit_start_dataout_timer(cmd, cmd->conn);
1146                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1147                 }
1148
1149                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1150                         return iscsit_add_reject_from_cmd(
1151                                 ISCSI_REASON_PROTOCOL_ERROR,
1152                                 1, 0, buf, cmd);
1153
1154         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1155                 /*
1156                  * Immediate Data failed DataCRC and ERL>=1,
1157                  * silently drop this PDU and let the initiator
1158                  * plug the CmdSN gap.
1159                  *
1160                  * FIXME: Send Unsolicited NOPIN with reserved
1161                  * TTT here to help the initiator figure out
1162                  * the missing CmdSN, although they should be
1163                  * intelligent enough to determine the missing
1164                  * CmdSN and issue a retry to plug the sequence.
1165                  */
1166                 cmd->i_state = ISTATE_REMOVE;
1167                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1168         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1169                 return -1;
1170
1171         return 0;
1172 }
1173
1174 static u32 iscsit_do_crypto_hash_sg(
1175         struct hash_desc *hash,
1176         struct iscsi_cmd *cmd,
1177         u32 data_offset,
1178         u32 data_length,
1179         u32 padding,
1180         u8 *pad_bytes)
1181 {
1182         u32 data_crc;
1183         u32 i;
1184         struct scatterlist *sg;
1185         unsigned int page_off;
1186
1187         crypto_hash_init(hash);
1188
1189         sg = cmd->first_data_sg;
1190         page_off = cmd->first_data_sg_off;
1191
1192         i = 0;
1193         while (data_length) {
1194                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1195
1196                 crypto_hash_update(hash, &sg[i], cur_len);
1197
1198                 data_length -= cur_len;
1199                 page_off = 0;
1200                 i++;
1201         }
1202
1203         if (padding) {
1204                 struct scatterlist pad_sg;
1205
1206                 sg_init_one(&pad_sg, pad_bytes, padding);
1207                 crypto_hash_update(hash, &pad_sg, padding);
1208         }
1209         crypto_hash_final(hash, (u8 *) &data_crc);
1210
1211         return data_crc;
1212 }
1213
1214 static void iscsit_do_crypto_hash_buf(
1215         struct hash_desc *hash,
1216         unsigned char *buf,
1217         u32 payload_length,
1218         u32 padding,
1219         u8 *pad_bytes,
1220         u8 *data_crc)
1221 {
1222         struct scatterlist sg;
1223
1224         crypto_hash_init(hash);
1225
1226         sg_init_one(&sg, (u8 *)buf, payload_length);
1227         crypto_hash_update(hash, &sg, payload_length);
1228
1229         if (padding) {
1230                 sg_init_one(&sg, pad_bytes, padding);
1231                 crypto_hash_update(hash, &sg, padding);
1232         }
1233         crypto_hash_final(hash, data_crc);
1234 }
1235
1236 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1237 {
1238         int iov_ret, ooo_cmdsn = 0, ret;
1239         u8 data_crc_failed = 0;
1240         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1241         u32 rx_size = 0, payload_length;
1242         struct iscsi_cmd *cmd = NULL;
1243         struct se_cmd *se_cmd;
1244         struct iscsi_data *hdr;
1245         struct kvec *iov;
1246         unsigned long flags;
1247
1248         hdr                     = (struct iscsi_data *) buf;
1249         payload_length          = ntoh24(hdr->dlength);
1250         hdr->itt                = be32_to_cpu(hdr->itt);
1251         hdr->ttt                = be32_to_cpu(hdr->ttt);
1252         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1253         hdr->datasn             = be32_to_cpu(hdr->datasn);
1254         hdr->offset             = be32_to_cpu(hdr->offset);
1255
1256         if (!payload_length) {
1257                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1258                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1259                                         buf, conn);
1260         }
1261
1262         /* iSCSI write */
1263         spin_lock_bh(&conn->sess->session_stats_lock);
1264         conn->sess->rx_data_octets += payload_length;
1265         if (conn->sess->se_sess->se_node_acl) {
1266                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1267                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1268                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1269         }
1270         spin_unlock_bh(&conn->sess->session_stats_lock);
1271
1272         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1273                 pr_err("DataSegmentLength: %u is greater than"
1274                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1275                         conn->conn_ops->MaxRecvDataSegmentLength);
1276                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1277                                         buf, conn);
1278         }
1279
1280         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1281                         payload_length);
1282         if (!cmd)
1283                 return 0;
1284
1285         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1286                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1287                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1288                 payload_length, conn->cid);
1289
1290         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1291                 pr_err("Command ITT: 0x%08x received DataOUT after"
1292                         " last DataOUT received, dumping payload\n",
1293                         cmd->init_task_tag);
1294                 return iscsit_dump_data_payload(conn, payload_length, 1);
1295         }
1296
1297         if (cmd->data_direction != DMA_TO_DEVICE) {
1298                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1299                         " NON-WRITE command.\n", cmd->init_task_tag);
1300                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1301                                 1, 0, buf, cmd);
1302         }
1303         se_cmd = &cmd->se_cmd;
1304         iscsit_mod_dataout_timer(cmd);
1305
1306         if ((hdr->offset + payload_length) > cmd->data_length) {
1307                 pr_err("DataOut Offset: %u, Length %u greater than"
1308                         " iSCSI Command EDTL %u, protocol error.\n",
1309                         hdr->offset, payload_length, cmd->data_length);
1310                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1311                                 1, 0, buf, cmd);
1312         }
1313
1314         if (cmd->unsolicited_data) {
1315                 int dump_unsolicited_data = 0;
1316
1317                 if (conn->sess->sess_ops->InitialR2T) {
1318                         pr_err("Received unexpected unsolicited data"
1319                                 " while InitialR2T=Yes, protocol error.\n");
1320                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1321                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1322                         return -1;
1323                 }
1324                 /*
1325                  * Special case for dealing with Unsolicited DataOUT
1326                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1327                  * failures;
1328                  */
1329
1330                 /* Something's amiss if we're not in WRITE_PENDING state... */
1331                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1332                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1333                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1334
1335                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1336                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1337                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1338                         dump_unsolicited_data = 1;
1339                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1340
1341                 if (dump_unsolicited_data) {
1342                         /*
1343                          * Check if a delayed TASK_ABORTED status needs to
1344                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1345                          * received with the unsolicitied data out.
1346                          */
1347                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1348                                 iscsit_stop_dataout_timer(cmd);
1349
1350                         transport_check_aborted_status(se_cmd,
1351                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1352                         return iscsit_dump_data_payload(conn, payload_length, 1);
1353                 }
1354         } else {
1355                 /*
1356                  * For the normal solicited data path:
1357                  *
1358                  * Check for a delayed TASK_ABORTED status and dump any
1359                  * incoming data out payload if one exists.  Also, when the
1360                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1361                  * data out sequence, we decrement outstanding_r2ts.  Once
1362                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1363                  * TASK_ABORTED status.
1364                  */
1365                 if (atomic_read(&se_cmd->t_transport_aborted) != 0) {
1366                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1367                                 if (--cmd->outstanding_r2ts < 1) {
1368                                         iscsit_stop_dataout_timer(cmd);
1369                                         transport_check_aborted_status(
1370                                                         se_cmd, 1);
1371                                 }
1372
1373                         return iscsit_dump_data_payload(conn, payload_length, 1);
1374                 }
1375         }
1376         /*
1377          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1378          * within-command recovery checks before receiving the payload.
1379          */
1380         ret = iscsit_check_pre_dataout(cmd, buf);
1381         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1382                 return 0;
1383         else if (ret == DATAOUT_CANNOT_RECOVER)
1384                 return -1;
1385
1386         rx_size += payload_length;
1387         iov = &cmd->iov_data[0];
1388
1389         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1390         if (iov_ret < 0)
1391                 return -1;
1392
1393         iov_count += iov_ret;
1394
1395         padding = ((-payload_length) & 3);
1396         if (padding != 0) {
1397                 iov[iov_count].iov_base = cmd->pad_bytes;
1398                 iov[iov_count++].iov_len = padding;
1399                 rx_size += padding;
1400                 pr_debug("Receiving %u padding bytes.\n", padding);
1401         }
1402
1403         if (conn->conn_ops->DataDigest) {
1404                 iov[iov_count].iov_base = &checksum;
1405                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1406                 rx_size += ISCSI_CRC_LEN;
1407         }
1408
1409         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1410
1411         iscsit_unmap_iovec(cmd);
1412
1413         if (rx_got != rx_size)
1414                 return -1;
1415
1416         if (conn->conn_ops->DataDigest) {
1417                 u32 data_crc;
1418
1419                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1420                                                     hdr->offset, payload_length, padding,
1421                                                     cmd->pad_bytes);
1422
1423                 if (checksum != data_crc) {
1424                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1425                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1426                                 " does not match computed 0x%08x\n",
1427                                 hdr->itt, hdr->offset, payload_length,
1428                                 hdr->datasn, checksum, data_crc);
1429                         data_crc_failed = 1;
1430                 } else {
1431                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1432                                 " %u bytes of Data Out\n", checksum,
1433                                 payload_length);
1434                 }
1435         }
1436         /*
1437          * Increment post receive data and CRC values or perform
1438          * within-command recovery.
1439          */
1440         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1441         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1442                 return 0;
1443         else if (ret == DATAOUT_SEND_R2T) {
1444                 iscsit_set_dataout_sequence_values(cmd);
1445                 iscsit_build_r2ts_for_cmd(cmd, conn, 0);
1446         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1447                 /*
1448                  * Handle extra special case for out of order
1449                  * Unsolicited Data Out.
1450                  */
1451                 spin_lock_bh(&cmd->istate_lock);
1452                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1453                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1454                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1455                 spin_unlock_bh(&cmd->istate_lock);
1456
1457                 iscsit_stop_dataout_timer(cmd);
1458                 return (!ooo_cmdsn) ? transport_generic_handle_data(
1459                                         &cmd->se_cmd) : 0;
1460         } else /* DATAOUT_CANNOT_RECOVER */
1461                 return -1;
1462
1463         return 0;
1464 }
1465
1466 static int iscsit_handle_nop_out(
1467         struct iscsi_conn *conn,
1468         unsigned char *buf)
1469 {
1470         unsigned char *ping_data = NULL;
1471         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1472         u32 checksum, data_crc, padding = 0, payload_length;
1473         u64 lun;
1474         struct iscsi_cmd *cmd = NULL;
1475         struct kvec *iov = NULL;
1476         struct iscsi_nopout *hdr;
1477
1478         hdr                     = (struct iscsi_nopout *) buf;
1479         payload_length          = ntoh24(hdr->dlength);
1480         lun                     = get_unaligned_le64(&hdr->lun);
1481         hdr->itt                = be32_to_cpu(hdr->itt);
1482         hdr->ttt                = be32_to_cpu(hdr->ttt);
1483         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1484         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1485
1486         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1487                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1488                         " not set, protocol error.\n");
1489                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1490                                         buf, conn);
1491         }
1492
1493         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1494                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1495                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1496                         " error.\n", payload_length,
1497                         conn->conn_ops->MaxRecvDataSegmentLength);
1498                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1499                                         buf, conn);
1500         }
1501
1502         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1503                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1504                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1505                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1506                 payload_length);
1507         /*
1508          * This is not a response to a Unsolicited NopIN, which means
1509          * it can either be a NOPOUT ping request (with a valid ITT),
1510          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1511          * Either way, make sure we allocate an struct iscsi_cmd, as both
1512          * can contain ping data.
1513          */
1514         if (hdr->ttt == 0xFFFFFFFF) {
1515                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1516                 if (!cmd)
1517                         return iscsit_add_reject(
1518                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1519                                         1, buf, conn);
1520
1521                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1522                 cmd->i_state            = ISTATE_SEND_NOPIN;
1523                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1524                                                 1 : 0);
1525                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1526                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1527                 cmd->cmd_sn             = hdr->cmdsn;
1528                 cmd->exp_stat_sn        = hdr->exp_statsn;
1529                 cmd->data_direction     = DMA_NONE;
1530         }
1531
1532         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1533                 rx_size = payload_length;
1534                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1535                 if (!ping_data) {
1536                         pr_err("Unable to allocate memory for"
1537                                 " NOPOUT ping data.\n");
1538                         ret = -1;
1539                         goto out;
1540                 }
1541
1542                 iov = &cmd->iov_misc[0];
1543                 iov[niov].iov_base      = ping_data;
1544                 iov[niov++].iov_len     = payload_length;
1545
1546                 padding = ((-payload_length) & 3);
1547                 if (padding != 0) {
1548                         pr_debug("Receiving %u additional bytes"
1549                                 " for padding.\n", padding);
1550                         iov[niov].iov_base      = &cmd->pad_bytes;
1551                         iov[niov++].iov_len     = padding;
1552                         rx_size += padding;
1553                 }
1554                 if (conn->conn_ops->DataDigest) {
1555                         iov[niov].iov_base      = &checksum;
1556                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1557                         rx_size += ISCSI_CRC_LEN;
1558                 }
1559
1560                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1561                 if (rx_got != rx_size) {
1562                         ret = -1;
1563                         goto out;
1564                 }
1565
1566                 if (conn->conn_ops->DataDigest) {
1567                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1568                                         ping_data, payload_length,
1569                                         padding, cmd->pad_bytes,
1570                                         (u8 *)&data_crc);
1571
1572                         if (checksum != data_crc) {
1573                                 pr_err("Ping data CRC32C DataDigest"
1574                                 " 0x%08x does not match computed 0x%08x\n",
1575                                         checksum, data_crc);
1576                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1577                                         pr_err("Unable to recover from"
1578                                         " NOPOUT Ping DataCRC failure while in"
1579                                                 " ERL=0.\n");
1580                                         ret = -1;
1581                                         goto out;
1582                                 } else {
1583                                         /*
1584                                          * Silently drop this PDU and let the
1585                                          * initiator plug the CmdSN gap.
1586                                          */
1587                                         pr_debug("Dropping NOPOUT"
1588                                         " Command CmdSN: 0x%08x due to"
1589                                         " DataCRC error.\n", hdr->cmdsn);
1590                                         ret = 0;
1591                                         goto out;
1592                                 }
1593                         } else {
1594                                 pr_debug("Got CRC32C DataDigest"
1595                                 " 0x%08x for %u bytes of ping data.\n",
1596                                         checksum, payload_length);
1597                         }
1598                 }
1599
1600                 ping_data[payload_length] = '\0';
1601                 /*
1602                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1603                  */
1604                 cmd->buf_ptr = (void *)ping_data;
1605                 cmd->buf_ptr_size = payload_length;
1606
1607                 pr_debug("Got %u bytes of NOPOUT ping"
1608                         " data.\n", payload_length);
1609                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1610         }
1611
1612         if (hdr->itt != 0xFFFFFFFF) {
1613                 if (!cmd) {
1614                         pr_err("Checking CmdSN for NOPOUT,"
1615                                 " but cmd is NULL!\n");
1616                         return -1;
1617                 }
1618                 /*
1619                  * Initiator is expecting a NopIN ping reply,
1620                  */
1621                 spin_lock_bh(&conn->cmd_lock);
1622                 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1623                 spin_unlock_bh(&conn->cmd_lock);
1624
1625                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1626
1627                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1628                         iscsit_add_cmd_to_response_queue(cmd, conn,
1629                                         cmd->i_state);
1630                         return 0;
1631                 }
1632
1633                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1634                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1635                         ret = 0;
1636                         goto ping_out;
1637                 }
1638                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1639                         return iscsit_add_reject_from_cmd(
1640                                         ISCSI_REASON_PROTOCOL_ERROR,
1641                                         1, 0, buf, cmd);
1642
1643                 return 0;
1644         }
1645
1646         if (hdr->ttt != 0xFFFFFFFF) {
1647                 /*
1648                  * This was a response to a unsolicited NOPIN ping.
1649                  */
1650                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1651                 if (!cmd)
1652                         return -1;
1653
1654                 iscsit_stop_nopin_response_timer(conn);
1655
1656                 cmd->i_state = ISTATE_REMOVE;
1657                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1658                 iscsit_start_nopin_timer(conn);
1659         } else {
1660                 /*
1661                  * Initiator is not expecting a NOPIN is response.
1662                  * Just ignore for now.
1663                  *
1664                  * iSCSI v19-91 10.18
1665                  * "A NOP-OUT may also be used to confirm a changed
1666                  *  ExpStatSN if another PDU will not be available
1667                  *  for a long time."
1668                  */
1669                 ret = 0;
1670                 goto out;
1671         }
1672
1673         return 0;
1674 out:
1675         if (cmd)
1676                 iscsit_release_cmd(cmd);
1677 ping_out:
1678         kfree(ping_data);
1679         return ret;
1680 }
1681
1682 static int iscsit_handle_task_mgt_cmd(
1683         struct iscsi_conn *conn,
1684         unsigned char *buf)
1685 {
1686         struct iscsi_cmd *cmd;
1687         struct se_tmr_req *se_tmr;
1688         struct iscsi_tmr_req *tmr_req;
1689         struct iscsi_tm *hdr;
1690         u32 payload_length;
1691         int out_of_order_cmdsn = 0;
1692         int ret;
1693         u8 function;
1694
1695         hdr                     = (struct iscsi_tm *) buf;
1696         payload_length          = ntoh24(hdr->dlength);
1697         hdr->itt                = be32_to_cpu(hdr->itt);
1698         hdr->rtt                = be32_to_cpu(hdr->rtt);
1699         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1700         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1701         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1702         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1703         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1704         function = hdr->flags;
1705
1706         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1707                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1708                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1709                 hdr->rtt, hdr->refcmdsn, conn->cid);
1710
1711         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1712             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1713              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1714                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1715                 hdr->rtt = ISCSI_RESERVED_TAG;
1716         }
1717
1718         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1719                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1720                 pr_err("Task Management Request TASK_REASSIGN not"
1721                         " issued as immediate command, bad iSCSI Initiator"
1722                                 "implementation\n");
1723                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1724                                         buf, conn);
1725         }
1726         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1727             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1728                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1729
1730         cmd = iscsit_allocate_se_cmd_for_tmr(conn, function);
1731         if (!cmd)
1732                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1733                                         1, buf, conn);
1734
1735         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1736         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1737         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1738         cmd->init_task_tag      = hdr->itt;
1739         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1740         cmd->cmd_sn             = hdr->cmdsn;
1741         cmd->exp_stat_sn        = hdr->exp_statsn;
1742         se_tmr                  = cmd->se_cmd.se_tmr_req;
1743         tmr_req                 = cmd->tmr_req;
1744         /*
1745          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1746          */
1747         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1748                 ret = iscsit_get_lun_for_tmr(cmd,
1749                                 get_unaligned_le64(&hdr->lun));
1750                 if (ret < 0) {
1751                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1752                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1753                         goto attach;
1754                 }
1755         }
1756
1757         switch (function) {
1758         case ISCSI_TM_FUNC_ABORT_TASK:
1759                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1760                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1761                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1762                         goto attach;
1763                 }
1764                 break;
1765         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1766         case ISCSI_TM_FUNC_CLEAR_ACA:
1767         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1768         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1769                 break;
1770         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1771                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1772                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1773                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1774                         goto attach;
1775                 }
1776                 break;
1777         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1778                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1779                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1780                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1781                         goto attach;
1782                 }
1783                 break;
1784         case ISCSI_TM_FUNC_TASK_REASSIGN:
1785                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1786                 /*
1787                  * Perform sanity checks on the ExpDataSN only if the
1788                  * TASK_REASSIGN was successful.
1789                  */
1790                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1791                         break;
1792
1793                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1794                         return iscsit_add_reject_from_cmd(
1795                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1796                                         buf, cmd);
1797                 break;
1798         default:
1799                 pr_err("Unknown TMR function: 0x%02x, protocol"
1800                         " error.\n", function);
1801                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1802                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1803                 goto attach;
1804         }
1805
1806         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1807             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1808                 se_tmr->call_transport = 1;
1809 attach:
1810         spin_lock_bh(&conn->cmd_lock);
1811         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1812         spin_unlock_bh(&conn->cmd_lock);
1813
1814         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1815                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1816                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1817                         out_of_order_cmdsn = 1;
1818                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1819                         return 0;
1820                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1821                         return iscsit_add_reject_from_cmd(
1822                                         ISCSI_REASON_PROTOCOL_ERROR,
1823                                         1, 0, buf, cmd);
1824         }
1825         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1826
1827         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1828                 return 0;
1829         /*
1830          * Found the referenced task, send to transport for processing.
1831          */
1832         if (se_tmr->call_transport)
1833                 return transport_generic_handle_tmr(&cmd->se_cmd);
1834
1835         /*
1836          * Could not find the referenced LUN, task, or Task Management
1837          * command not authorized or supported.  Change state and
1838          * let the tx_thread send the response.
1839          *
1840          * For connection recovery, this is also the default action for
1841          * TMR TASK_REASSIGN.
1842          */
1843         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1844         return 0;
1845 }
1846
1847 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1848 static int iscsit_handle_text_cmd(
1849         struct iscsi_conn *conn,
1850         unsigned char *buf)
1851 {
1852         char *text_ptr, *text_in;
1853         int cmdsn_ret, niov = 0, rx_got, rx_size;
1854         u32 checksum = 0, data_crc = 0, payload_length;
1855         u32 padding = 0, pad_bytes = 0, text_length = 0;
1856         struct iscsi_cmd *cmd;
1857         struct kvec iov[3];
1858         struct iscsi_text *hdr;
1859
1860         hdr                     = (struct iscsi_text *) buf;
1861         payload_length          = ntoh24(hdr->dlength);
1862         hdr->itt                = be32_to_cpu(hdr->itt);
1863         hdr->ttt                = be32_to_cpu(hdr->ttt);
1864         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1865         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1866
1867         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1868                 pr_err("Unable to accept text parameter length: %u"
1869                         "greater than MaxRecvDataSegmentLength %u.\n",
1870                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1871                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1872                                         buf, conn);
1873         }
1874
1875         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1876                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1877                 hdr->exp_statsn, payload_length);
1878
1879         rx_size = text_length = payload_length;
1880         if (text_length) {
1881                 text_in = kzalloc(text_length, GFP_KERNEL);
1882                 if (!text_in) {
1883                         pr_err("Unable to allocate memory for"
1884                                 " incoming text parameters\n");
1885                         return -1;
1886                 }
1887
1888                 memset(iov, 0, 3 * sizeof(struct kvec));
1889                 iov[niov].iov_base      = text_in;
1890                 iov[niov++].iov_len     = text_length;
1891
1892                 padding = ((-payload_length) & 3);
1893                 if (padding != 0) {
1894                         iov[niov].iov_base = &pad_bytes;
1895                         iov[niov++].iov_len  = padding;
1896                         rx_size += padding;
1897                         pr_debug("Receiving %u additional bytes"
1898                                         " for padding.\n", padding);
1899                 }
1900                 if (conn->conn_ops->DataDigest) {
1901                         iov[niov].iov_base      = &checksum;
1902                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1903                         rx_size += ISCSI_CRC_LEN;
1904                 }
1905
1906                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1907                 if (rx_got != rx_size) {
1908                         kfree(text_in);
1909                         return -1;
1910                 }
1911
1912                 if (conn->conn_ops->DataDigest) {
1913                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1914                                         text_in, text_length,
1915                                         padding, (u8 *)&pad_bytes,
1916                                         (u8 *)&data_crc);
1917
1918                         if (checksum != data_crc) {
1919                                 pr_err("Text data CRC32C DataDigest"
1920                                         " 0x%08x does not match computed"
1921                                         " 0x%08x\n", checksum, data_crc);
1922                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1923                                         pr_err("Unable to recover from"
1924                                         " Text Data digest failure while in"
1925                                                 " ERL=0.\n");
1926                                         kfree(text_in);
1927                                         return -1;
1928                                 } else {
1929                                         /*
1930                                          * Silently drop this PDU and let the
1931                                          * initiator plug the CmdSN gap.
1932                                          */
1933                                         pr_debug("Dropping Text"
1934                                         " Command CmdSN: 0x%08x due to"
1935                                         " DataCRC error.\n", hdr->cmdsn);
1936                                         kfree(text_in);
1937                                         return 0;
1938                                 }
1939                         } else {
1940                                 pr_debug("Got CRC32C DataDigest"
1941                                         " 0x%08x for %u bytes of text data.\n",
1942                                                 checksum, text_length);
1943                         }
1944                 }
1945                 text_in[text_length - 1] = '\0';
1946                 pr_debug("Successfully read %d bytes of text"
1947                                 " data.\n", text_length);
1948
1949                 if (strncmp("SendTargets", text_in, 11) != 0) {
1950                         pr_err("Received Text Data that is not"
1951                                 " SendTargets, cannot continue.\n");
1952                         kfree(text_in);
1953                         return -1;
1954                 }
1955                 text_ptr = strchr(text_in, '=');
1956                 if (!text_ptr) {
1957                         pr_err("No \"=\" separator found in Text Data,"
1958                                 "  cannot continue.\n");
1959                         kfree(text_in);
1960                         return -1;
1961                 }
1962                 if (strncmp("=All", text_ptr, 4) != 0) {
1963                         pr_err("Unable to locate All value for"
1964                                 " SendTargets key,  cannot continue.\n");
1965                         kfree(text_in);
1966                         return -1;
1967                 }
1968 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1969                 kfree(text_in);
1970         }
1971
1972         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1973         if (!cmd)
1974                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1975                                         1, buf, conn);
1976
1977         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1978         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1979         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1980         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1981         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1982         cmd->cmd_sn             = hdr->cmdsn;
1983         cmd->exp_stat_sn        = hdr->exp_statsn;
1984         cmd->data_direction     = DMA_NONE;
1985
1986         spin_lock_bh(&conn->cmd_lock);
1987         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1988         spin_unlock_bh(&conn->cmd_lock);
1989
1990         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1991
1992         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1993                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1994                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1995                         return iscsit_add_reject_from_cmd(
1996                                         ISCSI_REASON_PROTOCOL_ERROR,
1997                                         1, 0, buf, cmd);
1998
1999                 return 0;
2000         }
2001
2002         return iscsit_execute_cmd(cmd, 0);
2003 }
2004
2005 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2006 {
2007         struct iscsi_conn *conn_p;
2008         struct iscsi_session *sess = conn->sess;
2009
2010         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2011                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2012
2013         atomic_set(&sess->session_logout, 1);
2014         atomic_set(&conn->conn_logout_remove, 1);
2015         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2016
2017         iscsit_inc_conn_usage_count(conn);
2018         iscsit_inc_session_usage_count(sess);
2019
2020         spin_lock_bh(&sess->conn_lock);
2021         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2022                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2023                         continue;
2024
2025                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2026                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2027         }
2028         spin_unlock_bh(&sess->conn_lock);
2029
2030         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2031
2032         return 0;
2033 }
2034
2035 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2036 {
2037         struct iscsi_conn *l_conn;
2038         struct iscsi_session *sess = conn->sess;
2039
2040         pr_debug("Received logout request CLOSECONNECTION for CID:"
2041                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2042
2043         /*
2044          * A Logout Request with a CLOSECONNECTION reason code for a CID
2045          * can arrive on a connection with a differing CID.
2046          */
2047         if (conn->cid == cmd->logout_cid) {
2048                 spin_lock_bh(&conn->state_lock);
2049                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2050                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2051
2052                 atomic_set(&conn->conn_logout_remove, 1);
2053                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2054                 iscsit_inc_conn_usage_count(conn);
2055
2056                 spin_unlock_bh(&conn->state_lock);
2057         } else {
2058                 /*
2059                  * Handle all different cid CLOSECONNECTION requests in
2060                  * iscsit_logout_post_handler_diffcid() as to give enough
2061                  * time for any non immediate command's CmdSN to be
2062                  * acknowledged on the connection in question.
2063                  *
2064                  * Here we simply make sure the CID is still around.
2065                  */
2066                 l_conn = iscsit_get_conn_from_cid(sess,
2067                                 cmd->logout_cid);
2068                 if (!l_conn) {
2069                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2070                         iscsit_add_cmd_to_response_queue(cmd, conn,
2071                                         cmd->i_state);
2072                         return 0;
2073                 }
2074
2075                 iscsit_dec_conn_usage_count(l_conn);
2076         }
2077
2078         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2079
2080         return 0;
2081 }
2082
2083 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2084 {
2085         struct iscsi_session *sess = conn->sess;
2086
2087         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2088                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2089
2090         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2091                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2092                         " while ERL!=2.\n");
2093                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2094                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2095                 return 0;
2096         }
2097
2098         if (conn->cid == cmd->logout_cid) {
2099                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2100                         " with CID: %hu on CID: %hu, implementation error.\n",
2101                                 cmd->logout_cid, conn->cid);
2102                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2103                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2104                 return 0;
2105         }
2106
2107         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2108
2109         return 0;
2110 }
2111
2112 static int iscsit_handle_logout_cmd(
2113         struct iscsi_conn *conn,
2114         unsigned char *buf)
2115 {
2116         int cmdsn_ret, logout_remove = 0;
2117         u8 reason_code = 0;
2118         struct iscsi_cmd *cmd;
2119         struct iscsi_logout *hdr;
2120         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2121
2122         hdr                     = (struct iscsi_logout *) buf;
2123         reason_code             = (hdr->flags & 0x7f);
2124         hdr->itt                = be32_to_cpu(hdr->itt);
2125         hdr->cid                = be16_to_cpu(hdr->cid);
2126         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2127         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2128
2129         if (tiqn) {
2130                 spin_lock(&tiqn->logout_stats.lock);
2131                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2132                         tiqn->logout_stats.normal_logouts++;
2133                 else
2134                         tiqn->logout_stats.abnormal_logouts++;
2135                 spin_unlock(&tiqn->logout_stats.lock);
2136         }
2137
2138         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2139                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2140                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2141                 hdr->cid, conn->cid);
2142
2143         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2144                 pr_err("Received logout request on connection that"
2145                         " is not in logged in state, ignoring request.\n");
2146                 return 0;
2147         }
2148
2149         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2150         if (!cmd)
2151                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2152                                         buf, conn);
2153
2154         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2155         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2156         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2157         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2158         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2159         cmd->cmd_sn             = hdr->cmdsn;
2160         cmd->exp_stat_sn        = hdr->exp_statsn;
2161         cmd->logout_cid         = hdr->cid;
2162         cmd->logout_reason      = reason_code;
2163         cmd->data_direction     = DMA_NONE;
2164
2165         /*
2166          * We need to sleep in these cases (by returning 1) until the Logout
2167          * Response gets sent in the tx thread.
2168          */
2169         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2170            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2171             (hdr->cid == conn->cid)))
2172                 logout_remove = 1;
2173
2174         spin_lock_bh(&conn->cmd_lock);
2175         list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
2176         spin_unlock_bh(&conn->cmd_lock);
2177
2178         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2179                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2180
2181         /*
2182          * Immediate commands are executed, well, immediately.
2183          * Non-Immediate Logout Commands are executed in CmdSN order.
2184          */
2185         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
2186                 int ret = iscsit_execute_cmd(cmd, 0);
2187
2188                 if (ret < 0)
2189                         return ret;
2190         } else {
2191                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2192                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2193                         logout_remove = 0;
2194                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2195                         return iscsit_add_reject_from_cmd(
2196                                 ISCSI_REASON_PROTOCOL_ERROR,
2197                                 1, 0, buf, cmd);
2198                 }
2199         }
2200
2201         return logout_remove;
2202 }
2203
2204 static int iscsit_handle_snack(
2205         struct iscsi_conn *conn,
2206         unsigned char *buf)
2207 {
2208         u32 unpacked_lun;
2209         u64 lun;
2210         struct iscsi_snack *hdr;
2211
2212         hdr                     = (struct iscsi_snack *) buf;
2213         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2214         lun                     = get_unaligned_le64(&hdr->lun);
2215         unpacked_lun            = scsilun_to_int((struct scsi_lun *)&lun);
2216         hdr->itt                = be32_to_cpu(hdr->itt);
2217         hdr->ttt                = be32_to_cpu(hdr->ttt);
2218         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2219         hdr->begrun             = be32_to_cpu(hdr->begrun);
2220         hdr->runlength          = be32_to_cpu(hdr->runlength);
2221
2222         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2223                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2224                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2225                         hdr->begrun, hdr->runlength, conn->cid);
2226
2227         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2228                 pr_err("Initiator sent SNACK request while in"
2229                         " ErrorRecoveryLevel=0.\n");
2230                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2231                                         buf, conn);
2232         }
2233         /*
2234          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2235          * call from inside iscsi_send_recovery_datain_or_r2t().
2236          */
2237         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2238         case 0:
2239                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2240                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2241         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2242                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2243                         hdr->begrun, hdr->runlength);
2244         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2245                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2246                         hdr->runlength);
2247         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2248                 /* FIXME: Support R-Data SNACK */
2249                 pr_err("R-Data SNACK Not Supported.\n");
2250                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2251                                         buf, conn);
2252         default:
2253                 pr_err("Unknown SNACK type 0x%02x, protocol"
2254                         " error.\n", hdr->flags & 0x0f);
2255                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2256                                         buf, conn);
2257         }
2258
2259         return 0;
2260 }
2261
2262 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2263 {
2264         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2265             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2266                 wait_for_completion_interruptible_timeout(
2267                                         &conn->rx_half_close_comp,
2268                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2269         }
2270 }
2271
2272 static int iscsit_handle_immediate_data(
2273         struct iscsi_cmd *cmd,
2274         unsigned char *buf,
2275         u32 length)
2276 {
2277         int iov_ret, rx_got = 0, rx_size = 0;
2278         u32 checksum, iov_count = 0, padding = 0;
2279         struct iscsi_conn *conn = cmd->conn;
2280         struct kvec *iov;
2281
2282         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2283         if (iov_ret < 0)
2284                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2285
2286         rx_size = length;
2287         iov_count = iov_ret;
2288         iov = &cmd->iov_data[0];
2289
2290         padding = ((-length) & 3);
2291         if (padding != 0) {
2292                 iov[iov_count].iov_base = cmd->pad_bytes;
2293                 iov[iov_count++].iov_len = padding;
2294                 rx_size += padding;
2295         }
2296
2297         if (conn->conn_ops->DataDigest) {
2298                 iov[iov_count].iov_base         = &checksum;
2299                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2300                 rx_size += ISCSI_CRC_LEN;
2301         }
2302
2303         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2304
2305         iscsit_unmap_iovec(cmd);
2306
2307         if (rx_got != rx_size) {
2308                 iscsit_rx_thread_wait_for_tcp(conn);
2309                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2310         }
2311
2312         if (conn->conn_ops->DataDigest) {
2313                 u32 data_crc;
2314
2315                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2316                                                     cmd->write_data_done, length, padding,
2317                                                     cmd->pad_bytes);
2318
2319                 if (checksum != data_crc) {
2320                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2321                                 " does not match computed 0x%08x\n", checksum,
2322                                 data_crc);
2323
2324                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2325                                 pr_err("Unable to recover from"
2326                                         " Immediate Data digest failure while"
2327                                         " in ERL=0.\n");
2328                                 iscsit_add_reject_from_cmd(
2329                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2330                                                 1, 0, buf, cmd);
2331                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2332                         } else {
2333                                 iscsit_add_reject_from_cmd(
2334                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2335                                                 0, 0, buf, cmd);
2336                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2337                         }
2338                 } else {
2339                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2340                                 " %u bytes of Immediate Data\n", checksum,
2341                                 length);
2342                 }
2343         }
2344
2345         cmd->write_data_done += length;
2346
2347         if (cmd->write_data_done == cmd->data_length) {
2348                 spin_lock_bh(&cmd->istate_lock);
2349                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2350                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2351                 spin_unlock_bh(&cmd->istate_lock);
2352         }
2353
2354         return IMMEDIATE_DATA_NORMAL_OPERATION;
2355 }
2356
2357 /*
2358  *      Called with sess->conn_lock held.
2359  */
2360 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2361         with active network interface */
2362 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2363 {
2364         struct iscsi_cmd *cmd;
2365         struct iscsi_conn *conn_p;
2366
2367         /*
2368          * Only send a Asynchronous Message on connections whos network
2369          * interface is still functional.
2370          */
2371         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2372                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2373                         iscsit_inc_conn_usage_count(conn_p);
2374                         break;
2375                 }
2376         }
2377
2378         if (!conn_p)
2379                 return;
2380
2381         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2382         if (!cmd) {
2383                 iscsit_dec_conn_usage_count(conn_p);
2384                 return;
2385         }
2386
2387         cmd->logout_cid = conn->cid;
2388         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2389         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2390
2391         spin_lock_bh(&conn_p->cmd_lock);
2392         list_add_tail(&cmd->i_list, &conn_p->conn_cmd_list);
2393         spin_unlock_bh(&conn_p->cmd_lock);
2394
2395         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2396         iscsit_dec_conn_usage_count(conn_p);
2397 }
2398
2399 static int iscsit_send_conn_drop_async_message(
2400         struct iscsi_cmd *cmd,
2401         struct iscsi_conn *conn)
2402 {
2403         struct iscsi_async *hdr;
2404
2405         cmd->tx_size = ISCSI_HDR_LEN;
2406         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2407
2408         hdr                     = (struct iscsi_async *) cmd->pdu;
2409         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2410         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2411         cmd->init_task_tag      = 0xFFFFFFFF;
2412         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2413         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2414         cmd->stat_sn            = conn->stat_sn++;
2415         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2416         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2417         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2418         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2419         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2420         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2421         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2422
2423         if (conn->conn_ops->HeaderDigest) {
2424                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2425
2426                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2427                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2428                                 0, NULL, (u8 *)header_digest);
2429
2430                 cmd->tx_size += ISCSI_CRC_LEN;
2431                 pr_debug("Attaching CRC32C HeaderDigest to"
2432                         " Async Message 0x%08x\n", *header_digest);
2433         }
2434
2435         cmd->iov_misc[0].iov_base       = cmd->pdu;
2436         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2437         cmd->iov_misc_count             = 1;
2438
2439         pr_debug("Sending Connection Dropped Async Message StatSN:"
2440                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2441                         cmd->logout_cid, conn->cid);
2442         return 0;
2443 }
2444
2445 static int iscsit_send_data_in(
2446         struct iscsi_cmd *cmd,
2447         struct iscsi_conn *conn,
2448         int *eodr)
2449 {
2450         int iov_ret = 0, set_statsn = 0;
2451         u32 iov_count = 0, tx_size = 0;
2452         struct iscsi_datain datain;
2453         struct iscsi_datain_req *dr;
2454         struct iscsi_data_rsp *hdr;
2455         struct kvec *iov;
2456
2457         memset(&datain, 0, sizeof(struct iscsi_datain));
2458         dr = iscsit_get_datain_values(cmd, &datain);
2459         if (!dr) {
2460                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2461                                 cmd->init_task_tag);
2462                 return -1;
2463         }
2464
2465         /*
2466          * Be paranoid and double check the logic for now.
2467          */
2468         if ((datain.offset + datain.length) > cmd->data_length) {
2469                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2470                         " datain.length: %u exceeds cmd->data_length: %u\n",
2471                         cmd->init_task_tag, datain.offset, datain.length,
2472                                 cmd->data_length);
2473                 return -1;
2474         }
2475
2476         spin_lock_bh(&conn->sess->session_stats_lock);
2477         conn->sess->tx_data_octets += datain.length;
2478         if (conn->sess->se_sess->se_node_acl) {
2479                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2480                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2481                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2482         }
2483         spin_unlock_bh(&conn->sess->session_stats_lock);
2484         /*
2485          * Special case for successfully execution w/ both DATAIN
2486          * and Sense Data.
2487          */
2488         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2489             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2490                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2491         else {
2492                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2493                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2494                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2495                         cmd->stat_sn = conn->stat_sn++;
2496                         set_statsn = 1;
2497                 } else if (dr->dr_complete ==
2498                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2499                         set_statsn = 1;
2500         }
2501
2502         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2503         memset(hdr, 0, ISCSI_HDR_LEN);
2504         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2505         hdr->flags              = datain.flags;
2506         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2507                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2508                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2509                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2510                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2511                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2512                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2513                 }
2514         }
2515         hton24(hdr->dlength, datain.length);
2516         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2517                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2518                                 (struct scsi_lun *)&hdr->lun);
2519         else
2520                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2521
2522         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2523         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2524                                    cpu_to_be32(cmd->targ_xfer_tag) :
2525                                    0xFFFFFFFF;
2526         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2527                                                 0xFFFFFFFF;
2528         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2529         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2530         hdr->datasn             = cpu_to_be32(datain.data_sn);
2531         hdr->offset             = cpu_to_be32(datain.offset);
2532
2533         iov = &cmd->iov_data[0];
2534         iov[iov_count].iov_base = cmd->pdu;
2535         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2536         tx_size += ISCSI_HDR_LEN;
2537
2538         if (conn->conn_ops->HeaderDigest) {
2539                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2540
2541                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2542                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2543                                 0, NULL, (u8 *)header_digest);
2544
2545                 iov[0].iov_len += ISCSI_CRC_LEN;
2546                 tx_size += ISCSI_CRC_LEN;
2547
2548                 pr_debug("Attaching CRC32 HeaderDigest"
2549                         " for DataIN PDU 0x%08x\n", *header_digest);
2550         }
2551
2552         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2553         if (iov_ret < 0)
2554                 return -1;
2555
2556         iov_count += iov_ret;
2557         tx_size += datain.length;
2558
2559         cmd->padding = ((-datain.length) & 3);
2560         if (cmd->padding) {
2561                 iov[iov_count].iov_base         = cmd->pad_bytes;
2562                 iov[iov_count++].iov_len        = cmd->padding;
2563                 tx_size += cmd->padding;
2564
2565                 pr_debug("Attaching %u padding bytes\n",
2566                                 cmd->padding);
2567         }
2568         if (conn->conn_ops->DataDigest) {
2569                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2570                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2571
2572                 iov[iov_count].iov_base = &cmd->data_crc;
2573                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2574                 tx_size += ISCSI_CRC_LEN;
2575
2576                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2577                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2578         }
2579
2580         cmd->iov_data_count = iov_count;
2581         cmd->tx_size = tx_size;
2582
2583         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2584                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2585                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2586                 ntohl(hdr->offset), datain.length, conn->cid);
2587
2588         if (dr->dr_complete) {
2589                 *eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2590                                 2 : 1;
2591                 iscsit_free_datain_req(cmd, dr);
2592         }
2593
2594         return 0;
2595 }
2596
2597 static int iscsit_send_logout_response(
2598         struct iscsi_cmd *cmd,
2599         struct iscsi_conn *conn)
2600 {
2601         int niov = 0, tx_size;
2602         struct iscsi_conn *logout_conn = NULL;
2603         struct iscsi_conn_recovery *cr = NULL;
2604         struct iscsi_session *sess = conn->sess;
2605         struct kvec *iov;
2606         struct iscsi_logout_rsp *hdr;
2607         /*
2608          * The actual shutting down of Sessions and/or Connections
2609          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2610          * is done in scsi_logout_post_handler().
2611          */
2612         switch (cmd->logout_reason) {
2613         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2614                 pr_debug("iSCSI session logout successful, setting"
2615                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2616                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2617                 break;
2618         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2619                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2620                         break;
2621                 /*
2622                  * For CLOSECONNECTION logout requests carrying
2623                  * a matching logout CID -> local CID, the reference
2624                  * for the local CID will have been incremented in
2625                  * iscsi_logout_closeconnection().
2626                  *
2627                  * For CLOSECONNECTION logout requests carrying
2628                  * a different CID than the connection it arrived
2629                  * on, the connection responding to cmd->logout_cid
2630                  * is stopped in iscsit_logout_post_handler_diffcid().
2631                  */
2632
2633                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2634                         " successful.\n", cmd->logout_cid, conn->cid);
2635                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2636                 break;
2637         case ISCSI_LOGOUT_REASON_RECOVERY:
2638                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2639                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2640                         break;
2641                 /*
2642                  * If the connection is still active from our point of view
2643                  * force connection recovery to occur.
2644                  */
2645                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2646                                 cmd->logout_cid);
2647                 if ((logout_conn)) {
2648                         iscsit_connection_reinstatement_rcfr(logout_conn);
2649                         iscsit_dec_conn_usage_count(logout_conn);
2650                 }
2651
2652                 cr = iscsit_get_inactive_connection_recovery_entry(
2653                                 conn->sess, cmd->logout_cid);
2654                 if (!cr) {
2655                         pr_err("Unable to locate CID: %hu for"
2656                         " REMOVECONNFORRECOVERY Logout Request.\n",
2657                                 cmd->logout_cid);
2658                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2659                         break;
2660                 }
2661
2662                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2663
2664                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2665                         " for recovery for CID: %hu on CID: %hu successful.\n",
2666                                 cmd->logout_cid, conn->cid);
2667                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2668                 break;
2669         default:
2670                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2671                                 cmd->logout_reason);
2672                 return -1;
2673         }
2674
2675         tx_size = ISCSI_HDR_LEN;
2676         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2677         memset(hdr, 0, ISCSI_HDR_LEN);
2678         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2679         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2680         hdr->response           = cmd->logout_response;
2681         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2682         cmd->stat_sn            = conn->stat_sn++;
2683         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2684
2685         iscsit_increment_maxcmdsn(cmd, conn->sess);
2686         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2687         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2688
2689         iov = &cmd->iov_misc[0];
2690         iov[niov].iov_base      = cmd->pdu;
2691         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2692
2693         if (conn->conn_ops->HeaderDigest) {
2694                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2695
2696                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2697                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2698                                 0, NULL, (u8 *)header_digest);
2699
2700                 iov[0].iov_len += ISCSI_CRC_LEN;
2701                 tx_size += ISCSI_CRC_LEN;
2702                 pr_debug("Attaching CRC32C HeaderDigest to"
2703                         " Logout Response 0x%08x\n", *header_digest);
2704         }
2705         cmd->iov_misc_count = niov;
2706         cmd->tx_size = tx_size;
2707
2708         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2709                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2710                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2711                 cmd->logout_cid, conn->cid);
2712
2713         return 0;
2714 }
2715
2716 /*
2717  *      Unsolicited NOPIN, either requesting a response or not.
2718  */
2719 static int iscsit_send_unsolicited_nopin(
2720         struct iscsi_cmd *cmd,
2721         struct iscsi_conn *conn,
2722         int want_response)
2723 {
2724         int tx_size = ISCSI_HDR_LEN;
2725         struct iscsi_nopin *hdr;
2726
2727         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2728         memset(hdr, 0, ISCSI_HDR_LEN);
2729         hdr->opcode             = ISCSI_OP_NOOP_IN;
2730         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2731         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2732         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2733         cmd->stat_sn            = conn->stat_sn;
2734         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2735         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2736         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2737
2738         if (conn->conn_ops->HeaderDigest) {
2739                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2740
2741                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2742                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2743                                 0, NULL, (u8 *)header_digest);
2744
2745                 tx_size += ISCSI_CRC_LEN;
2746                 pr_debug("Attaching CRC32C HeaderDigest to"
2747                         " NopIN 0x%08x\n", *header_digest);
2748         }
2749
2750         cmd->iov_misc[0].iov_base       = cmd->pdu;
2751         cmd->iov_misc[0].iov_len        = tx_size;
2752         cmd->iov_misc_count     = 1;
2753         cmd->tx_size            = tx_size;
2754
2755         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2756                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2757
2758         return 0;
2759 }
2760
2761 static int iscsit_send_nopin_response(
2762         struct iscsi_cmd *cmd,
2763         struct iscsi_conn *conn)
2764 {
2765         int niov = 0, tx_size;
2766         u32 padding = 0;
2767         struct kvec *iov;
2768         struct iscsi_nopin *hdr;
2769
2770         tx_size = ISCSI_HDR_LEN;
2771         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2772         memset(hdr, 0, ISCSI_HDR_LEN);
2773         hdr->opcode             = ISCSI_OP_NOOP_IN;
2774         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2775         hton24(hdr->dlength, cmd->buf_ptr_size);
2776         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2777         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2778         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2779         cmd->stat_sn            = conn->stat_sn++;
2780         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2781
2782         iscsit_increment_maxcmdsn(cmd, conn->sess);
2783         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2784         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2785
2786         iov = &cmd->iov_misc[0];
2787         iov[niov].iov_base      = cmd->pdu;
2788         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2789
2790         if (conn->conn_ops->HeaderDigest) {
2791                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2792
2793                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2794                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2795                                 0, NULL, (u8 *)header_digest);
2796
2797                 iov[0].iov_len += ISCSI_CRC_LEN;
2798                 tx_size += ISCSI_CRC_LEN;
2799                 pr_debug("Attaching CRC32C HeaderDigest"
2800                         " to NopIn 0x%08x\n", *header_digest);
2801         }
2802
2803         /*
2804          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2805          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2806          */
2807         if (cmd->buf_ptr_size) {
2808                 iov[niov].iov_base      = cmd->buf_ptr;
2809                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2810                 tx_size += cmd->buf_ptr_size;
2811
2812                 pr_debug("Echoing back %u bytes of ping"
2813                         " data.\n", cmd->buf_ptr_size);
2814
2815                 padding = ((-cmd->buf_ptr_size) & 3);
2816                 if (padding != 0) {
2817                         iov[niov].iov_base = &cmd->pad_bytes;
2818                         iov[niov++].iov_len = padding;
2819                         tx_size += padding;
2820                         pr_debug("Attaching %u additional"
2821                                 " padding bytes.\n", padding);
2822                 }
2823                 if (conn->conn_ops->DataDigest) {
2824                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2825                                 cmd->buf_ptr, cmd->buf_ptr_size,
2826                                 padding, (u8 *)&cmd->pad_bytes,
2827                                 (u8 *)&cmd->data_crc);
2828
2829                         iov[niov].iov_base = &cmd->data_crc;
2830                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2831                         tx_size += ISCSI_CRC_LEN;
2832                         pr_debug("Attached DataDigest for %u"
2833                                 " bytes of ping data, CRC 0x%08x\n",
2834                                 cmd->buf_ptr_size, cmd->data_crc);
2835                 }
2836         }
2837
2838         cmd->iov_misc_count = niov;
2839         cmd->tx_size = tx_size;
2840
2841         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2842                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2843                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2844
2845         return 0;
2846 }
2847
2848 int iscsit_send_r2t(
2849         struct iscsi_cmd *cmd,
2850         struct iscsi_conn *conn)
2851 {
2852         int tx_size = 0;
2853         struct iscsi_r2t *r2t;
2854         struct iscsi_r2t_rsp *hdr;
2855
2856         r2t = iscsit_get_r2t_from_list(cmd);
2857         if (!r2t)
2858                 return -1;
2859
2860         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2861         memset(hdr, 0, ISCSI_HDR_LEN);
2862         hdr->opcode             = ISCSI_OP_R2T;
2863         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2864         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2865                         (struct scsi_lun *)&hdr->lun);
2866         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2867         spin_lock_bh(&conn->sess->ttt_lock);
2868         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2869         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2870                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2871         spin_unlock_bh(&conn->sess->ttt_lock);
2872         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2873         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2874         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2875         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2876         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2877         hdr->data_offset        = cpu_to_be32(r2t->offset);
2878         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2879
2880         cmd->iov_misc[0].iov_base       = cmd->pdu;
2881         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2882         tx_size += ISCSI_HDR_LEN;
2883
2884         if (conn->conn_ops->HeaderDigest) {
2885                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2886
2887                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2888                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2889                                 0, NULL, (u8 *)header_digest);
2890
2891                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2892                 tx_size += ISCSI_CRC_LEN;
2893                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2894                         " PDU 0x%08x\n", *header_digest);
2895         }
2896
2897         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2898                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2899                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2900                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2901                         r2t->offset, r2t->xfer_len, conn->cid);
2902
2903         cmd->iov_misc_count = 1;
2904         cmd->tx_size = tx_size;
2905
2906         spin_lock_bh(&cmd->r2t_lock);
2907         r2t->sent_r2t = 1;
2908         spin_unlock_bh(&cmd->r2t_lock);
2909
2910         return 0;
2911 }
2912
2913 /*
2914  *      type 0: Normal Operation.
2915  *      type 1: Called from Storage Transport.
2916  *      type 2: Called from iscsi_task_reassign_complete_write() for
2917  *              connection recovery.
2918  */
2919 int iscsit_build_r2ts_for_cmd(
2920         struct iscsi_cmd *cmd,
2921         struct iscsi_conn *conn,
2922         int type)
2923 {
2924         int first_r2t = 1;
2925         u32 offset = 0, xfer_len = 0;
2926
2927         spin_lock_bh(&cmd->r2t_lock);
2928         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2929                 spin_unlock_bh(&cmd->r2t_lock);
2930                 return 0;
2931         }
2932
2933         if (conn->sess->sess_ops->DataSequenceInOrder && (type != 2))
2934                 if (cmd->r2t_offset < cmd->write_data_done)
2935                         cmd->r2t_offset = cmd->write_data_done;
2936
2937         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2938                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2939                         offset = cmd->r2t_offset;
2940
2941                         if (first_r2t && (type == 2)) {
2942                                 xfer_len = ((offset +
2943                                              (conn->sess->sess_ops->MaxBurstLength -
2944                                              cmd->next_burst_len) >
2945                                              cmd->data_length) ?
2946                                             (cmd->data_length - offset) :
2947                                             (conn->sess->sess_ops->MaxBurstLength -
2948                                              cmd->next_burst_len));
2949                         } else {
2950                                 xfer_len = ((offset +
2951                                              conn->sess->sess_ops->MaxBurstLength) >
2952                                              cmd->data_length) ?
2953                                              (cmd->data_length - offset) :
2954                                              conn->sess->sess_ops->MaxBurstLength;
2955                         }
2956                         cmd->r2t_offset += xfer_len;
2957
2958                         if (cmd->r2t_offset == cmd->data_length)
2959                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2960                 } else {
2961                         struct iscsi_seq *seq;
2962
2963                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2964                         if (!seq) {
2965                                 spin_unlock_bh(&cmd->r2t_lock);
2966                                 return -1;
2967                         }
2968
2969                         offset = seq->offset;
2970                         xfer_len = seq->xfer_len;
2971
2972                         if (cmd->seq_send_order == cmd->seq_count)
2973                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2974                 }
2975                 cmd->outstanding_r2ts++;
2976                 first_r2t = 0;
2977
2978                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2979                         spin_unlock_bh(&cmd->r2t_lock);
2980                         return -1;
2981                 }
2982
2983                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2984                         break;
2985         }
2986         spin_unlock_bh(&cmd->r2t_lock);
2987
2988         return 0;
2989 }
2990
2991 static int iscsit_send_status(
2992         struct iscsi_cmd *cmd,
2993         struct iscsi_conn *conn)
2994 {
2995         u8 iov_count = 0, recovery;
2996         u32 padding = 0, tx_size = 0;
2997         struct iscsi_scsi_rsp *hdr;
2998         struct kvec *iov;
2999
3000         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3001         if (!recovery)
3002                 cmd->stat_sn = conn->stat_sn++;
3003
3004         spin_lock_bh(&conn->sess->session_stats_lock);
3005         conn->sess->rsp_pdus++;
3006         spin_unlock_bh(&conn->sess->session_stats_lock);
3007
3008         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3009         memset(hdr, 0, ISCSI_HDR_LEN);
3010         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3011         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3012         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3013                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3014                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3015         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3016                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3017                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3018         }
3019         hdr->response           = cmd->iscsi_response;
3020         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3021         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3022         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3023
3024         iscsit_increment_maxcmdsn(cmd, conn->sess);
3025         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3026         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3027
3028         iov = &cmd->iov_misc[0];
3029         iov[iov_count].iov_base = cmd->pdu;
3030         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3031         tx_size += ISCSI_HDR_LEN;
3032
3033         /*
3034          * Attach SENSE DATA payload to iSCSI Response PDU
3035          */
3036         if (cmd->se_cmd.sense_buffer &&
3037            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3038             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3039                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3040                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3041                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3042                 iov[iov_count++].iov_len =
3043                                 (cmd->se_cmd.scsi_sense_length + padding);
3044                 tx_size += cmd->se_cmd.scsi_sense_length;
3045
3046                 if (padding) {
3047                         memset(cmd->se_cmd.sense_buffer +
3048                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3049                         tx_size += padding;
3050                         pr_debug("Adding %u bytes of padding to"
3051                                 " SENSE.\n", padding);
3052                 }
3053
3054                 if (conn->conn_ops->DataDigest) {
3055                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3056                                 cmd->se_cmd.sense_buffer,
3057                                 (cmd->se_cmd.scsi_sense_length + padding),
3058                                 0, NULL, (u8 *)&cmd->data_crc);
3059
3060                         iov[iov_count].iov_base    = &cmd->data_crc;
3061                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3062                         tx_size += ISCSI_CRC_LEN;
3063
3064                         pr_debug("Attaching CRC32 DataDigest for"
3065                                 " SENSE, %u bytes CRC 0x%08x\n",
3066                                 (cmd->se_cmd.scsi_sense_length + padding),
3067                                 cmd->data_crc);
3068                 }
3069
3070                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3071                                 " Response PDU\n",
3072                                 cmd->se_cmd.scsi_sense_length);
3073         }
3074
3075         if (conn->conn_ops->HeaderDigest) {
3076                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3077
3078                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3079                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3080                                 0, NULL, (u8 *)header_digest);
3081
3082                 iov[0].iov_len += ISCSI_CRC_LEN;
3083                 tx_size += ISCSI_CRC_LEN;
3084                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3085                                 " PDU 0x%08x\n", *header_digest);
3086         }
3087
3088         cmd->iov_misc_count = iov_count;
3089         cmd->tx_size = tx_size;
3090
3091         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3092                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3093                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3094                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3095
3096         return 0;
3097 }
3098
3099 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3100 {
3101         switch (se_tmr->response) {
3102         case TMR_FUNCTION_COMPLETE:
3103                 return ISCSI_TMF_RSP_COMPLETE;
3104         case TMR_TASK_DOES_NOT_EXIST:
3105                 return ISCSI_TMF_RSP_NO_TASK;
3106         case TMR_LUN_DOES_NOT_EXIST:
3107                 return ISCSI_TMF_RSP_NO_LUN;
3108         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3109                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3110         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3111                 return ISCSI_TMF_RSP_AUTH_FAILED;
3112         case TMR_FUNCTION_REJECTED:
3113         default:
3114                 return ISCSI_TMF_RSP_REJECTED;
3115         }
3116 }
3117
3118 static int iscsit_send_task_mgt_rsp(
3119         struct iscsi_cmd *cmd,
3120         struct iscsi_conn *conn)
3121 {
3122         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3123         struct iscsi_tm_rsp *hdr;
3124         u32 tx_size = 0;
3125
3126         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3127         memset(hdr, 0, ISCSI_HDR_LEN);
3128         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3129         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3130         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3131         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3132         cmd->stat_sn            = conn->stat_sn++;
3133         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3134
3135         iscsit_increment_maxcmdsn(cmd, conn->sess);
3136         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3137         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3138
3139         cmd->iov_misc[0].iov_base       = cmd->pdu;
3140         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3141         tx_size += ISCSI_HDR_LEN;
3142
3143         if (conn->conn_ops->HeaderDigest) {
3144                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3145
3146                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3147                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3148                                 0, NULL, (u8 *)header_digest);
3149
3150                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3151                 tx_size += ISCSI_CRC_LEN;
3152                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3153                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3154         }
3155
3156         cmd->iov_misc_count = 1;
3157         cmd->tx_size = tx_size;
3158
3159         pr_debug("Built Task Management Response ITT: 0x%08x,"
3160                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3161                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3162
3163         return 0;
3164 }
3165
3166 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3167 {
3168         bool ret = false;
3169
3170         if (np->np_sockaddr.ss_family == AF_INET6) {
3171                 const struct sockaddr_in6 sin6 = {
3172                         .sin6_addr = IN6ADDR_ANY_INIT };
3173                 struct sockaddr_in6 *sock_in6 =
3174                          (struct sockaddr_in6 *)&np->np_sockaddr;
3175
3176                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3177                                 sin6.sin6_addr.s6_addr, 16))
3178                         ret = true;
3179         } else {
3180                 struct sockaddr_in * sock_in =
3181                         (struct sockaddr_in *)&np->np_sockaddr;
3182
3183                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3184                         ret = true;
3185         }
3186
3187         return ret;
3188 }
3189
3190 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3191 {
3192         char *payload = NULL;
3193         struct iscsi_conn *conn = cmd->conn;
3194         struct iscsi_portal_group *tpg;
3195         struct iscsi_tiqn *tiqn;
3196         struct iscsi_tpg_np *tpg_np;
3197         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3198         unsigned char buf[256];
3199
3200         buffer_len = (conn->conn_ops->MaxRecvDataSegmentLength > 32768) ?
3201                         32768 : conn->conn_ops->MaxRecvDataSegmentLength;
3202
3203         memset(buf, 0, 256);
3204
3205         payload = kzalloc(buffer_len, GFP_KERNEL);
3206         if (!payload) {
3207                 pr_err("Unable to allocate memory for sendtargets"
3208                                 " response.\n");
3209                 return -ENOMEM;
3210         }
3211
3212         spin_lock(&tiqn_lock);
3213         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3214                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3215                 len += 1;
3216
3217                 if ((len + payload_len) > buffer_len) {
3218                         spin_unlock(&tiqn->tiqn_tpg_lock);
3219                         end_of_buf = 1;
3220                         goto eob;
3221                 }
3222                 memcpy((void *)payload + payload_len, buf, len);
3223                 payload_len += len;
3224
3225                 spin_lock(&tiqn->tiqn_tpg_lock);
3226                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3227
3228                         spin_lock(&tpg->tpg_state_lock);
3229                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3230                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3231                                 spin_unlock(&tpg->tpg_state_lock);
3232                                 continue;
3233                         }
3234                         spin_unlock(&tpg->tpg_state_lock);
3235
3236                         spin_lock(&tpg->tpg_np_lock);
3237                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3238                                                 tpg_np_list) {
3239                                 struct iscsi_np *np = tpg_np->tpg_np;
3240                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3241
3242                                 len = sprintf(buf, "TargetAddress="
3243                                         "%s%s%s:%hu,%hu",
3244                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3245                                         "[" : "", (inaddr_any == false) ?
3246                                                 np->np_ip : conn->local_ip,
3247                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3248                                         "]" : "", (inaddr_any == false) ?
3249                                                 np->np_port : conn->local_port,
3250                                         tpg->tpgt);
3251                                 len += 1;
3252
3253                                 if ((len + payload_len) > buffer_len) {
3254                                         spin_unlock(&tpg->tpg_np_lock);
3255                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3256                                         end_of_buf = 1;
3257                                         goto eob;
3258                                 }
3259                                 memcpy((void *)payload + payload_len, buf, len);
3260                                 payload_len += len;
3261                         }
3262                         spin_unlock(&tpg->tpg_np_lock);
3263                 }
3264                 spin_unlock(&tiqn->tiqn_tpg_lock);
3265 eob:
3266                 if (end_of_buf)
3267                         break;
3268         }
3269         spin_unlock(&tiqn_lock);
3270
3271         cmd->buf_ptr = payload;
3272
3273         return payload_len;
3274 }
3275
3276 /*
3277  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3278  *      MaxRecvDataSegmentLength.
3279  */
3280 static int iscsit_send_text_rsp(
3281         struct iscsi_cmd *cmd,
3282         struct iscsi_conn *conn)
3283 {
3284         struct iscsi_text_rsp *hdr;
3285         struct kvec *iov;
3286         u32 padding = 0, tx_size = 0;
3287         int text_length, iov_count = 0;
3288
3289         text_length = iscsit_build_sendtargets_response(cmd);
3290         if (text_length < 0)
3291                 return text_length;
3292
3293         padding = ((-text_length) & 3);
3294         if (padding != 0) {
3295                 memset(cmd->buf_ptr + text_length, 0, padding);
3296                 pr_debug("Attaching %u additional bytes for"
3297                         " padding.\n", padding);
3298         }
3299
3300         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3301         memset(hdr, 0, ISCSI_HDR_LEN);
3302         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3303         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3304         hton24(hdr->dlength, text_length);
3305         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3306         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3307         cmd->stat_sn            = conn->stat_sn++;
3308         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3309
3310         iscsit_increment_maxcmdsn(cmd, conn->sess);
3311         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3312         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3313
3314         iov = &cmd->iov_misc[0];
3315
3316         iov[iov_count].iov_base = cmd->pdu;
3317         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3318         iov[iov_count].iov_base = cmd->buf_ptr;
3319         iov[iov_count++].iov_len = text_length + padding;
3320
3321         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3322
3323         if (conn->conn_ops->HeaderDigest) {
3324                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3325
3326                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3327                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3328                                 0, NULL, (u8 *)header_digest);
3329
3330                 iov[0].iov_len += ISCSI_CRC_LEN;
3331                 tx_size += ISCSI_CRC_LEN;
3332                 pr_debug("Attaching CRC32 HeaderDigest for"
3333                         " Text Response PDU 0x%08x\n", *header_digest);
3334         }
3335
3336         if (conn->conn_ops->DataDigest) {
3337                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3338                                 cmd->buf_ptr, (text_length + padding),
3339                                 0, NULL, (u8 *)&cmd->data_crc);
3340
3341                 iov[iov_count].iov_base = &cmd->data_crc;
3342                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3343                 tx_size += ISCSI_CRC_LEN;
3344
3345                 pr_debug("Attaching DataDigest for %u bytes of text"
3346                         " data, CRC 0x%08x\n", (text_length + padding),
3347                         cmd->data_crc);
3348         }
3349
3350         cmd->iov_misc_count = iov_count;
3351         cmd->tx_size = tx_size;
3352
3353         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3354                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3355                         text_length, conn->cid);
3356         return 0;
3357 }
3358
3359 static int iscsit_send_reject(
3360         struct iscsi_cmd *cmd,
3361         struct iscsi_conn *conn)
3362 {
3363         u32 iov_count = 0, tx_size = 0;
3364         struct iscsi_reject *hdr;
3365         struct kvec *iov;
3366
3367         hdr                     = (struct iscsi_reject *) cmd->pdu;
3368         hdr->opcode             = ISCSI_OP_REJECT;
3369         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3370         hton24(hdr->dlength, ISCSI_HDR_LEN);
3371         cmd->stat_sn            = conn->stat_sn++;
3372         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3373         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3374         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3375
3376         iov = &cmd->iov_misc[0];
3377
3378         iov[iov_count].iov_base = cmd->pdu;
3379         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3380         iov[iov_count].iov_base = cmd->buf_ptr;
3381         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3382
3383         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3384
3385         if (conn->conn_ops->HeaderDigest) {
3386                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3387
3388                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3389                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3390                                 0, NULL, (u8 *)header_digest);
3391
3392                 iov[0].iov_len += ISCSI_CRC_LEN;
3393                 tx_size += ISCSI_CRC_LEN;
3394                 pr_debug("Attaching CRC32 HeaderDigest for"
3395                         " REJECT PDU 0x%08x\n", *header_digest);
3396         }
3397
3398         if (conn->conn_ops->DataDigest) {
3399                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3400                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3401                                 0, NULL, (u8 *)&cmd->data_crc);
3402
3403                 iov[iov_count].iov_base = &cmd->data_crc;
3404                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3405                 tx_size += ISCSI_CRC_LEN;
3406                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3407                                 " PDU 0x%08x\n", cmd->data_crc);
3408         }
3409
3410         cmd->iov_misc_count = iov_count;
3411         cmd->tx_size = tx_size;
3412
3413         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3414                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3415
3416         return 0;
3417 }
3418
3419 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
3420 {
3421         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
3422             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
3423                 wait_for_completion_interruptible_timeout(
3424                                         &conn->tx_half_close_comp,
3425                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
3426         }
3427 }
3428
3429 #ifdef CONFIG_SMP
3430
3431 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3432 {
3433         struct iscsi_thread_set *ts = conn->thread_set;
3434         int ord, cpu;
3435         /*
3436          * thread_id is assigned from iscsit_global->ts_bitmap from
3437          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3438          *
3439          * Here we use thread_id to determine which CPU that this
3440          * iSCSI connection's iscsi_thread_set will be scheduled to
3441          * execute upon.
3442          */
3443         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3444 #if 0
3445         pr_debug(">>>>>>>>>>>>>>>>>>>> Generated ord: %d from"
3446                         " thread_id: %d\n", ord, ts->thread_id);
3447 #endif
3448         for_each_online_cpu(cpu) {
3449                 if (ord-- == 0) {
3450                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3451                         return;
3452                 }
3453         }
3454         /*
3455          * This should never be reached..
3456          */
3457         dump_stack();
3458         cpumask_setall(conn->conn_cpumask);
3459 }
3460
3461 static inline void iscsit_thread_check_cpumask(
3462         struct iscsi_conn *conn,
3463         struct task_struct *p,
3464         int mode)
3465 {
3466         char buf[128];
3467         /*
3468          * mode == 1 signals iscsi_target_tx_thread() usage.
3469          * mode == 0 signals iscsi_target_rx_thread() usage.
3470          */
3471         if (mode == 1) {
3472                 if (!conn->conn_tx_reset_cpumask)
3473                         return;
3474                 conn->conn_tx_reset_cpumask = 0;
3475         } else {
3476                 if (!conn->conn_rx_reset_cpumask)
3477                         return;
3478                 conn->conn_rx_reset_cpumask = 0;
3479         }
3480         /*
3481          * Update the CPU mask for this single kthread so that
3482          * both TX and RX kthreads are scheduled to run on the
3483          * same CPU.
3484          */
3485         memset(buf, 0, 128);
3486         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3487 #if 0
3488         pr_debug(">>>>>>>>>>>>>> Calling set_cpus_allowed_ptr():"
3489                         " %s for %s\n", buf, p->comm);
3490 #endif
3491         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3492 }
3493
3494 #else
3495
3496 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3497 {
3498         return;
3499 }
3500
3501 #define iscsit_thread_check_cpumask(X, Y, Z) ({})
3502 #endif /* CONFIG_SMP */
3503
3504 int iscsi_target_tx_thread(void *arg)
3505 {
3506         u8 state;
3507         int eodr = 0;
3508         int ret = 0;
3509         int sent_status = 0;
3510         int use_misc = 0;
3511         int map_sg = 0;
3512         struct iscsi_cmd *cmd = NULL;
3513         struct iscsi_conn *conn;
3514         struct iscsi_queue_req *qr = NULL;
3515         struct se_cmd *se_cmd;
3516         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3517         /*
3518          * Allow ourselves to be interrupted by SIGINT so that a
3519          * connection recovery / failure event can be triggered externally.
3520          */
3521         allow_signal(SIGINT);
3522
3523 restart:
3524         conn = iscsi_tx_thread_pre_handler(ts);
3525         if (!conn)
3526                 goto out;
3527
3528         eodr = map_sg = ret = sent_status = use_misc = 0;
3529
3530         while (!kthread_should_stop()) {
3531                 /*
3532                  * Ensure that both TX and RX per connection kthreads
3533                  * are scheduled to run on the same CPU.
3534                  */
3535                 iscsit_thread_check_cpumask(conn, current, 1);
3536
3537                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3538
3539                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3540                      signal_pending(current))
3541                         goto transport_err;
3542
3543 get_immediate:
3544                 qr = iscsit_get_cmd_from_immediate_queue(conn);
3545                 if (qr) {
3546                         atomic_set(&conn->check_immediate_queue, 0);
3547                         cmd = qr->cmd;
3548                         state = qr->state;
3549                         kmem_cache_free(lio_qr_cache, qr);
3550
3551                         spin_lock_bh(&cmd->istate_lock);
3552                         switch (state) {
3553                         case ISTATE_SEND_R2T:
3554                                 spin_unlock_bh(&cmd->istate_lock);
3555                                 ret = iscsit_send_r2t(cmd, conn);
3556                                 break;
3557                         case ISTATE_REMOVE:
3558                                 spin_unlock_bh(&cmd->istate_lock);
3559
3560                                 if (cmd->data_direction == DMA_TO_DEVICE)
3561                                         iscsit_stop_dataout_timer(cmd);
3562
3563                                 spin_lock_bh(&conn->cmd_lock);
3564                                 list_del(&cmd->i_list);
3565                                 spin_unlock_bh(&conn->cmd_lock);
3566
3567                                 iscsit_free_cmd(cmd);
3568                                 goto get_immediate;
3569                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3570                                 spin_unlock_bh(&cmd->istate_lock);
3571                                 iscsit_mod_nopin_response_timer(conn);
3572                                 ret = iscsit_send_unsolicited_nopin(cmd,
3573                                                 conn, 1);
3574                                 break;
3575                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3576                                 spin_unlock_bh(&cmd->istate_lock);
3577                                 ret = iscsit_send_unsolicited_nopin(cmd,
3578                                                 conn, 0);
3579                                 break;
3580                         default:
3581                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3582                                 " 0x%08x, i_state: %d on CID: %hu\n",
3583                                 cmd->iscsi_opcode, cmd->init_task_tag, state,
3584                                 conn->cid);
3585                                 spin_unlock_bh(&cmd->istate_lock);
3586                                 goto transport_err;
3587                         }
3588                         if (ret < 0) {
3589                                 conn->tx_immediate_queue = 0;
3590                                 goto transport_err;
3591                         }
3592
3593                         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3594                                 conn->tx_immediate_queue = 0;
3595                                 iscsit_tx_thread_wait_for_tcp(conn);
3596                                 goto transport_err;
3597                         }
3598
3599                         spin_lock_bh(&cmd->istate_lock);
3600                         switch (state) {
3601                         case ISTATE_SEND_R2T:
3602                                 spin_unlock_bh(&cmd->istate_lock);
3603                                 spin_lock_bh(&cmd->dataout_timeout_lock);
3604                                 iscsit_start_dataout_timer(cmd, conn);
3605                                 spin_unlock_bh(&cmd->dataout_timeout_lock);
3606                                 break;
3607                         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3608                                 cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
3609                                 spin_unlock_bh(&cmd->istate_lock);
3610                                 break;
3611                         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3612                                 cmd->i_state = ISTATE_SENT_STATUS;
3613                                 spin_unlock_bh(&cmd->istate_lock);
3614                                 break;
3615                         default:
3616                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3617                                         " 0x%08x, i_state: %d on CID: %hu\n",
3618                                         cmd->iscsi_opcode, cmd->init_task_tag,
3619                                         state, conn->cid);
3620                                 spin_unlock_bh(&cmd->istate_lock);
3621                                 goto transport_err;
3622                         }
3623                         goto get_immediate;
3624                 } else
3625                         conn->tx_immediate_queue = 0;
3626
3627 get_response:
3628                 qr = iscsit_get_cmd_from_response_queue(conn);
3629                 if (qr) {
3630                         cmd = qr->cmd;
3631                         state = qr->state;
3632                         kmem_cache_free(lio_qr_cache, qr);
3633
3634                         spin_lock_bh(&cmd->istate_lock);
3635 check_rsp_state:
3636                         switch (state) {
3637                         case ISTATE_SEND_DATAIN:
3638                                 spin_unlock_bh(&cmd->istate_lock);
3639                                 ret = iscsit_send_data_in(cmd, conn,
3640                                                           &eodr);
3641                                 map_sg = 1;
3642                                 break;
3643                         case ISTATE_SEND_STATUS:
3644                         case ISTATE_SEND_STATUS_RECOVERY:
3645                                 spin_unlock_bh(&cmd->istate_lock);
3646                                 use_misc = 1;
3647                                 ret = iscsit_send_status(cmd, conn);
3648                                 break;
3649                         case ISTATE_SEND_LOGOUTRSP:
3650                                 spin_unlock_bh(&cmd->istate_lock);
3651                                 use_misc = 1;
3652                                 ret = iscsit_send_logout_response(cmd, conn);
3653                                 break;
3654                         case ISTATE_SEND_ASYNCMSG:
3655                                 spin_unlock_bh(&cmd->istate_lock);
3656                                 use_misc = 1;
3657                                 ret = iscsit_send_conn_drop_async_message(
3658                                                 cmd, conn);
3659                                 break;
3660                         case ISTATE_SEND_NOPIN:
3661                                 spin_unlock_bh(&cmd->istate_lock);
3662                                 use_misc = 1;
3663                                 ret = iscsit_send_nopin_response(cmd, conn);
3664                                 break;
3665                         case ISTATE_SEND_REJECT:
3666                                 spin_unlock_bh(&cmd->istate_lock);
3667                                 use_misc = 1;
3668                                 ret = iscsit_send_reject(cmd, conn);
3669                                 break;
3670                         case ISTATE_SEND_TASKMGTRSP:
3671                                 spin_unlock_bh(&cmd->istate_lock);
3672                                 use_misc = 1;
3673                                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3674                                 if (ret != 0)
3675                                         break;
3676                                 ret = iscsit_tmr_post_handler(cmd, conn);
3677                                 if (ret != 0)
3678                                         iscsit_fall_back_to_erl0(conn->sess);
3679                                 break;
3680                         case ISTATE_SEND_TEXTRSP:
3681                                 spin_unlock_bh(&cmd->istate_lock);
3682                                 use_misc = 1;
3683                                 ret = iscsit_send_text_rsp(cmd, conn);
3684                                 break;
3685                         default:
3686                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3687                                         " 0x%08x, i_state: %d on CID: %hu\n",
3688                                         cmd->iscsi_opcode, cmd->init_task_tag,
3689                                         state, conn->cid);
3690                                 spin_unlock_bh(&cmd->istate_lock);
3691                                 goto transport_err;
3692                         }
3693                         if (ret < 0) {
3694                                 conn->tx_response_queue = 0;
3695                                 goto transport_err;
3696                         }
3697
3698                         se_cmd = &cmd->se_cmd;
3699
3700                         if (map_sg && !conn->conn_ops->IFMarker) {
3701                                 if (iscsit_fe_sendpage_sg(cmd, conn) < 0) {
3702                                         conn->tx_response_queue = 0;
3703                                         iscsit_tx_thread_wait_for_tcp(conn);
3704                                         iscsit_unmap_iovec(cmd);
3705                                         goto transport_err;
3706                                 }
3707                         } else {
3708                                 if (iscsit_send_tx_data(cmd, conn, use_misc) < 0) {
3709                                         conn->tx_response_queue = 0;
3710                                         iscsit_tx_thread_wait_for_tcp(conn);
3711                                         iscsit_unmap_iovec(cmd);
3712                                         goto transport_err;
3713                                 }
3714                         }
3715                         map_sg = 0;
3716                         iscsit_unmap_iovec(cmd);
3717
3718                         spin_lock_bh(&cmd->istate_lock);
3719                         switch (state) {
3720                         case ISTATE_SEND_DATAIN:
3721                                 if (!eodr)
3722                                         goto check_rsp_state;
3723
3724                                 if (eodr == 1) {
3725                                         cmd->i_state = ISTATE_SENT_LAST_DATAIN;
3726                                         sent_status = 1;
3727                                         eodr = use_misc = 0;
3728                                 } else if (eodr == 2) {
3729                                         cmd->i_state = state =
3730                                                         ISTATE_SEND_STATUS;
3731                                         sent_status = 0;
3732                                         eodr = use_misc = 0;
3733                                         goto check_rsp_state;
3734                                 }
3735                                 break;
3736                         case ISTATE_SEND_STATUS:
3737                                 use_misc = 0;
3738                                 sent_status = 1;
3739                                 break;
3740                         case ISTATE_SEND_ASYNCMSG:
3741                         case ISTATE_SEND_NOPIN:
3742                         case ISTATE_SEND_STATUS_RECOVERY:
3743                         case ISTATE_SEND_TEXTRSP:
3744                                 use_misc = 0;
3745                                 sent_status = 1;
3746                                 break;
3747                         case ISTATE_SEND_REJECT:
3748                                 use_misc = 0;
3749                                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3750                                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3751                                         spin_unlock_bh(&cmd->istate_lock);
3752                                         complete(&cmd->reject_comp);
3753                                         goto transport_err;
3754                                 }
3755                                 complete(&cmd->reject_comp);
3756                                 break;
3757                         case ISTATE_SEND_TASKMGTRSP:
3758                                 use_misc = 0;
3759                                 sent_status = 1;
3760                                 break;
3761                         case ISTATE_SEND_LOGOUTRSP:
3762                                 spin_unlock_bh(&cmd->istate_lock);
3763                                 if (!iscsit_logout_post_handler(cmd, conn))
3764                                         goto restart;
3765                                 spin_lock_bh(&cmd->istate_lock);
3766                                 use_misc = 0;
3767                                 sent_status = 1;
3768                                 break;
3769                         default:
3770                                 pr_err("Unknown Opcode: 0x%02x ITT:"
3771                                         " 0x%08x, i_state: %d on CID: %hu\n",
3772                                         cmd->iscsi_opcode, cmd->init_task_tag,
3773                                         cmd->i_state, conn->cid);
3774                                 spin_unlock_bh(&cmd->istate_lock);
3775                                 goto transport_err;
3776                         }
3777
3778                         if (sent_status) {
3779                                 cmd->i_state = ISTATE_SENT_STATUS;
3780                                 sent_status = 0;
3781                         }
3782                         spin_unlock_bh(&cmd->istate_lock);
3783
3784                         if (atomic_read(&conn->check_immediate_queue))
3785                                 goto get_immediate;
3786
3787                         goto get_response;
3788                 } else
3789                         conn->tx_response_queue = 0;
3790         }
3791
3792 transport_err:
3793         iscsit_take_action_for_connection_exit(conn);
3794         goto restart;
3795 out:
3796         return 0;
3797 }
3798
3799 int iscsi_target_rx_thread(void *arg)
3800 {
3801         int ret;
3802         u8 buffer[ISCSI_HDR_LEN], opcode;
3803         u32 checksum = 0, digest = 0;
3804         struct iscsi_conn *conn = NULL;
3805         struct iscsi_thread_set *ts = (struct iscsi_thread_set *)arg;
3806         struct kvec iov;
3807         /*
3808          * Allow ourselves to be interrupted by SIGINT so that a
3809          * connection recovery / failure event can be triggered externally.
3810          */
3811         allow_signal(SIGINT);
3812
3813 restart:
3814         conn = iscsi_rx_thread_pre_handler(ts);
3815         if (!conn)
3816                 goto out;
3817
3818         while (!kthread_should_stop()) {
3819                 /*
3820                  * Ensure that both TX and RX per connection kthreads
3821                  * are scheduled to run on the same CPU.
3822                  */
3823                 iscsit_thread_check_cpumask(conn, current, 0);
3824
3825                 memset(buffer, 0, ISCSI_HDR_LEN);
3826                 memset(&iov, 0, sizeof(struct kvec));
3827
3828                 iov.iov_base    = buffer;
3829                 iov.iov_len     = ISCSI_HDR_LEN;
3830
3831                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3832                 if (ret != ISCSI_HDR_LEN) {
3833                         iscsit_rx_thread_wait_for_tcp(conn);
3834                         goto transport_err;
3835                 }
3836
3837                 /*
3838                  * Set conn->bad_hdr for use with REJECT PDUs.
3839                  */
3840                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3841
3842                 if (conn->conn_ops->HeaderDigest) {
3843                         iov.iov_base    = &digest;
3844                         iov.iov_len     = ISCSI_CRC_LEN;
3845
3846                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3847                         if (ret != ISCSI_CRC_LEN) {
3848                                 iscsit_rx_thread_wait_for_tcp(conn);
3849                                 goto transport_err;
3850                         }
3851
3852                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3853                                         buffer, ISCSI_HDR_LEN,
3854                                         0, NULL, (u8 *)&checksum);
3855
3856                         if (digest != checksum) {
3857                                 pr_err("HeaderDigest CRC32C failed,"
3858                                         " received 0x%08x, computed 0x%08x\n",
3859                                         digest, checksum);
3860                                 /*
3861                                  * Set the PDU to 0xff so it will intentionally
3862                                  * hit default in the switch below.
3863                                  */
3864                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3865                                 spin_lock_bh(&conn->sess->session_stats_lock);
3866                                 conn->sess->conn_digest_errors++;
3867                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3868                         } else {
3869                                 pr_debug("Got HeaderDigest CRC32C"
3870                                                 " 0x%08x\n", checksum);
3871                         }
3872                 }
3873
3874                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3875                         goto transport_err;
3876
3877                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3878
3879                 if (conn->sess->sess_ops->SessionType &&
3880                    ((!(opcode & ISCSI_OP_TEXT)) ||
3881                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3882                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3883                         " while in Discovery Session, rejecting.\n", opcode);
3884                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3885                                         buffer, conn);
3886                         goto transport_err;
3887                 }
3888
3889                 switch (opcode) {
3890                 case ISCSI_OP_SCSI_CMD:
3891                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3892                                 goto transport_err;
3893                         break;
3894                 case ISCSI_OP_SCSI_DATA_OUT:
3895                         if (iscsit_handle_data_out(conn, buffer) < 0)
3896                                 goto transport_err;
3897                         break;
3898                 case ISCSI_OP_NOOP_OUT:
3899                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3900                                 goto transport_err;
3901                         break;
3902                 case ISCSI_OP_SCSI_TMFUNC:
3903                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3904                                 goto transport_err;
3905                         break;
3906                 case ISCSI_OP_TEXT:
3907                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3908                                 goto transport_err;
3909                         break;
3910                 case ISCSI_OP_LOGOUT:
3911                         ret = iscsit_handle_logout_cmd(conn, buffer);
3912                         if (ret > 0) {
3913                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3914                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3915                                 goto transport_err;
3916                         } else if (ret < 0)
3917                                 goto transport_err;
3918                         break;
3919                 case ISCSI_OP_SNACK:
3920                         if (iscsit_handle_snack(conn, buffer) < 0)
3921                                 goto transport_err;
3922                         break;
3923                 default:
3924                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3925                                         opcode);
3926                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3927                                 pr_err("Cannot recover from unknown"
3928                                 " opcode while ERL=0, closing iSCSI connection"
3929                                 ".\n");
3930                                 goto transport_err;
3931                         }
3932                         if (!conn->conn_ops->OFMarker) {
3933                                 pr_err("Unable to recover from unknown"
3934                                 " opcode while OFMarker=No, closing iSCSI"
3935                                         " connection.\n");
3936                                 goto transport_err;
3937                         }
3938                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3939                                 pr_err("Unable to recover from unknown"
3940                                         " opcode, closing iSCSI connection.\n");
3941                                 goto transport_err;
3942                         }
3943                         break;
3944                 }
3945         }
3946
3947 transport_err:
3948         if (!signal_pending(current))
3949                 atomic_set(&conn->transport_failed, 1);
3950         iscsit_take_action_for_connection_exit(conn);
3951         goto restart;
3952 out:
3953         return 0;
3954 }
3955
3956 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3957 {
3958         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3959         struct iscsi_session *sess = conn->sess;
3960         /*
3961          * We expect this function to only ever be called from either RX or TX
3962          * thread context via iscsit_close_connection() once the other context
3963          * has been reset -> returned sleeping pre-handler state.
3964          */
3965         spin_lock_bh(&conn->cmd_lock);
3966         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_list) {
3967
3968                 list_del(&cmd->i_list);
3969                 spin_unlock_bh(&conn->cmd_lock);
3970
3971                 iscsit_increment_maxcmdsn(cmd, sess);
3972
3973                 iscsit_free_cmd(cmd);
3974
3975                 spin_lock_bh(&conn->cmd_lock);
3976         }
3977         spin_unlock_bh(&conn->cmd_lock);
3978 }
3979
3980 static void iscsit_stop_timers_for_cmds(
3981         struct iscsi_conn *conn)
3982 {
3983         struct iscsi_cmd *cmd;
3984
3985         spin_lock_bh(&conn->cmd_lock);
3986         list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
3987                 if (cmd->data_direction == DMA_TO_DEVICE)
3988                         iscsit_stop_dataout_timer(cmd);
3989         }
3990         spin_unlock_bh(&conn->cmd_lock);
3991 }
3992
3993 int iscsit_close_connection(
3994         struct iscsi_conn *conn)
3995 {
3996         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3997         struct iscsi_session    *sess = conn->sess;
3998
3999         pr_debug("Closing iSCSI connection CID %hu on SID:"
4000                 " %u\n", conn->cid, sess->sid);
4001         /*
4002          * Always up conn_logout_comp just in case the RX Thread is sleeping
4003          * and the logout response never got sent because the connection
4004          * failed.
4005          */
4006         complete(&conn->conn_logout_comp);
4007
4008         iscsi_release_thread_set(conn);
4009
4010         iscsit_stop_timers_for_cmds(conn);
4011         iscsit_stop_nopin_response_timer(conn);
4012         iscsit_stop_nopin_timer(conn);
4013         iscsit_free_queue_reqs_for_conn(conn);
4014
4015         /*
4016          * During Connection recovery drop unacknowledged out of order
4017          * commands for this connection, and prepare the other commands
4018          * for realligence.
4019          *
4020          * During normal operation clear the out of order commands (but
4021          * do not free the struct iscsi_ooo_cmdsn's) and release all
4022          * struct iscsi_cmds.
4023          */
4024         if (atomic_read(&conn->connection_recovery)) {
4025                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4026                 iscsit_prepare_cmds_for_realligance(conn);
4027         } else {
4028                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4029                 iscsit_release_commands_from_conn(conn);
4030         }
4031
4032         /*
4033          * Handle decrementing session or connection usage count if
4034          * a logout response was not able to be sent because the
4035          * connection failed.  Fall back to Session Recovery here.
4036          */
4037         if (atomic_read(&conn->conn_logout_remove)) {
4038                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4039                         iscsit_dec_conn_usage_count(conn);
4040                         iscsit_dec_session_usage_count(sess);
4041                 }
4042                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4043                         iscsit_dec_conn_usage_count(conn);
4044
4045                 atomic_set(&conn->conn_logout_remove, 0);
4046                 atomic_set(&sess->session_reinstatement, 0);
4047                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4048         }
4049
4050         spin_lock_bh(&sess->conn_lock);
4051         list_del(&conn->conn_list);
4052
4053         /*
4054          * Attempt to let the Initiator know this connection failed by
4055          * sending an Connection Dropped Async Message on another
4056          * active connection.
4057          */
4058         if (atomic_read(&conn->connection_recovery))
4059                 iscsit_build_conn_drop_async_message(conn);
4060
4061         spin_unlock_bh(&sess->conn_lock);
4062
4063         /*
4064          * If connection reinstatement is being performed on this connection,
4065          * up the connection reinstatement semaphore that is being blocked on
4066          * in iscsit_cause_connection_reinstatement().
4067          */
4068         spin_lock_bh(&conn->state_lock);
4069         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4070                 spin_unlock_bh(&conn->state_lock);
4071                 complete(&conn->conn_wait_comp);
4072                 wait_for_completion(&conn->conn_post_wait_comp);
4073                 spin_lock_bh(&conn->state_lock);
4074         }
4075
4076         /*
4077          * If connection reinstatement is being performed on this connection
4078          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4079          * connection wait rcfr semaphore that is being blocked on
4080          * an iscsit_connection_reinstatement_rcfr().
4081          */
4082         if (atomic_read(&conn->connection_wait_rcfr)) {
4083                 spin_unlock_bh(&conn->state_lock);
4084                 complete(&conn->conn_wait_rcfr_comp);
4085                 wait_for_completion(&conn->conn_post_wait_comp);
4086                 spin_lock_bh(&conn->state_lock);
4087         }
4088         atomic_set(&conn->connection_reinstatement, 1);
4089         spin_unlock_bh(&conn->state_lock);
4090
4091         /*
4092          * If any other processes are accessing this connection pointer we
4093          * must wait until they have completed.
4094          */
4095         iscsit_check_conn_usage_count(conn);
4096
4097         if (conn->conn_rx_hash.tfm)
4098                 crypto_free_hash(conn->conn_rx_hash.tfm);
4099         if (conn->conn_tx_hash.tfm)
4100                 crypto_free_hash(conn->conn_tx_hash.tfm);
4101
4102         if (conn->conn_cpumask)
4103                 free_cpumask_var(conn->conn_cpumask);
4104
4105         kfree(conn->conn_ops);
4106         conn->conn_ops = NULL;
4107
4108         if (conn->sock) {
4109                 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
4110                         kfree(conn->sock->file);
4111                         conn->sock->file = NULL;
4112                 }
4113                 sock_release(conn->sock);
4114         }
4115         conn->thread_set = NULL;
4116
4117         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4118         conn->conn_state = TARG_CONN_STATE_FREE;
4119         kfree(conn);
4120
4121         spin_lock_bh(&sess->conn_lock);
4122         atomic_dec(&sess->nconn);
4123         pr_debug("Decremented iSCSI connection count to %hu from node:"
4124                 " %s\n", atomic_read(&sess->nconn),
4125                 sess->sess_ops->InitiatorName);
4126         /*
4127          * Make sure that if one connection fails in an non ERL=2 iSCSI
4128          * Session that they all fail.
4129          */
4130         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4131              !atomic_read(&sess->session_logout))
4132                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4133
4134         /*
4135          * If this was not the last connection in the session, and we are
4136          * performing session reinstatement or falling back to ERL=0, call
4137          * iscsit_stop_session() without sleeping to shutdown the other
4138          * active connections.
4139          */
4140         if (atomic_read(&sess->nconn)) {
4141                 if (!atomic_read(&sess->session_reinstatement) &&
4142                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4143                         spin_unlock_bh(&sess->conn_lock);
4144                         return 0;
4145                 }
4146                 if (!atomic_read(&sess->session_stop_active)) {
4147                         atomic_set(&sess->session_stop_active, 1);
4148                         spin_unlock_bh(&sess->conn_lock);
4149                         iscsit_stop_session(sess, 0, 0);
4150                         return 0;
4151                 }
4152                 spin_unlock_bh(&sess->conn_lock);
4153                 return 0;
4154         }
4155
4156         /*
4157          * If this was the last connection in the session and one of the
4158          * following is occurring:
4159          *
4160          * Session Reinstatement is not being performed, and are falling back
4161          * to ERL=0 call iscsit_close_session().
4162          *
4163          * Session Logout was requested.  iscsit_close_session() will be called
4164          * elsewhere.
4165          *
4166          * Session Continuation is not being performed, start the Time2Retain
4167          * handler and check if sleep_on_sess_wait_sem is active.
4168          */
4169         if (!atomic_read(&sess->session_reinstatement) &&
4170              atomic_read(&sess->session_fall_back_to_erl0)) {
4171                 spin_unlock_bh(&sess->conn_lock);
4172                 iscsit_close_session(sess);
4173
4174                 return 0;
4175         } else if (atomic_read(&sess->session_logout)) {
4176                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4177                 sess->session_state = TARG_SESS_STATE_FREE;
4178                 spin_unlock_bh(&sess->conn_lock);
4179
4180                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4181                         complete(&sess->session_wait_comp);
4182
4183                 return 0;
4184         } else {
4185                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4186                 sess->session_state = TARG_SESS_STATE_FAILED;
4187
4188                 if (!atomic_read(&sess->session_continuation)) {
4189                         spin_unlock_bh(&sess->conn_lock);
4190                         iscsit_start_time2retain_handler(sess);
4191                 } else
4192                         spin_unlock_bh(&sess->conn_lock);
4193
4194                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4195                         complete(&sess->session_wait_comp);
4196
4197                 return 0;
4198         }
4199         spin_unlock_bh(&sess->conn_lock);
4200
4201         return 0;
4202 }
4203
4204 int iscsit_close_session(struct iscsi_session *sess)
4205 {
4206         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4207         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4208
4209         if (atomic_read(&sess->nconn)) {
4210                 pr_err("%d connection(s) still exist for iSCSI session"
4211                         " to %s\n", atomic_read(&sess->nconn),
4212                         sess->sess_ops->InitiatorName);
4213                 BUG();
4214         }
4215
4216         spin_lock_bh(&se_tpg->session_lock);
4217         atomic_set(&sess->session_logout, 1);
4218         atomic_set(&sess->session_reinstatement, 1);
4219         iscsit_stop_time2retain_timer(sess);
4220         spin_unlock_bh(&se_tpg->session_lock);
4221
4222         /*
4223          * transport_deregister_session_configfs() will clear the
4224          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4225          * can be setting it again with __transport_register_session() in
4226          * iscsi_post_login_handler() again after the iscsit_stop_session()
4227          * completes in iscsi_np context.
4228          */
4229         transport_deregister_session_configfs(sess->se_sess);
4230
4231         /*
4232          * If any other processes are accessing this session pointer we must
4233          * wait until they have completed.  If we are in an interrupt (the
4234          * time2retain handler) and contain and active session usage count we
4235          * restart the timer and exit.
4236          */
4237         if (!in_interrupt()) {
4238                 if (iscsit_check_session_usage_count(sess) == 1)
4239                         iscsit_stop_session(sess, 1, 1);
4240         } else {
4241                 if (iscsit_check_session_usage_count(sess) == 2) {
4242                         atomic_set(&sess->session_logout, 0);
4243                         iscsit_start_time2retain_handler(sess);
4244                         return 0;
4245                 }
4246         }
4247
4248         transport_deregister_session(sess->se_sess);
4249
4250         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4251                 iscsit_free_connection_recovery_entires(sess);
4252
4253         iscsit_free_all_ooo_cmdsns(sess);
4254
4255         spin_lock_bh(&se_tpg->session_lock);
4256         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4257         sess->session_state = TARG_SESS_STATE_FREE;
4258         pr_debug("Released iSCSI session from node: %s\n",
4259                         sess->sess_ops->InitiatorName);
4260         tpg->nsessions--;
4261         if (tpg->tpg_tiqn)
4262                 tpg->tpg_tiqn->tiqn_nsessions--;
4263
4264         pr_debug("Decremented number of active iSCSI Sessions on"
4265                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4266
4267         spin_lock(&sess_idr_lock);
4268         idr_remove(&sess_idr, sess->session_index);
4269         spin_unlock(&sess_idr_lock);
4270
4271         kfree(sess->sess_ops);
4272         sess->sess_ops = NULL;
4273         spin_unlock_bh(&se_tpg->session_lock);
4274
4275         kfree(sess);
4276         return 0;
4277 }
4278
4279 static void iscsit_logout_post_handler_closesession(
4280         struct iscsi_conn *conn)
4281 {
4282         struct iscsi_session *sess = conn->sess;
4283
4284         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4285         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4286
4287         atomic_set(&conn->conn_logout_remove, 0);
4288         complete(&conn->conn_logout_comp);
4289
4290         iscsit_dec_conn_usage_count(conn);
4291         iscsit_stop_session(sess, 1, 1);
4292         iscsit_dec_session_usage_count(sess);
4293         iscsit_close_session(sess);
4294 }
4295
4296 static void iscsit_logout_post_handler_samecid(
4297         struct iscsi_conn *conn)
4298 {
4299         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4300         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4301
4302         atomic_set(&conn->conn_logout_remove, 0);
4303         complete(&conn->conn_logout_comp);
4304
4305         iscsit_cause_connection_reinstatement(conn, 1);
4306         iscsit_dec_conn_usage_count(conn);
4307 }
4308
4309 static void iscsit_logout_post_handler_diffcid(
4310         struct iscsi_conn *conn,
4311         u16 cid)
4312 {
4313         struct iscsi_conn *l_conn;
4314         struct iscsi_session *sess = conn->sess;
4315
4316         if (!sess)
4317                 return;
4318
4319         spin_lock_bh(&sess->conn_lock);
4320         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4321                 if (l_conn->cid == cid) {
4322                         iscsit_inc_conn_usage_count(l_conn);
4323                         break;
4324                 }
4325         }
4326         spin_unlock_bh(&sess->conn_lock);
4327
4328         if (!l_conn)
4329                 return;
4330
4331         if (l_conn->sock)
4332                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4333
4334         spin_lock_bh(&l_conn->state_lock);
4335         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4336         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4337         spin_unlock_bh(&l_conn->state_lock);
4338
4339         iscsit_cause_connection_reinstatement(l_conn, 1);
4340         iscsit_dec_conn_usage_count(l_conn);
4341 }
4342
4343 /*
4344  *      Return of 0 causes the TX thread to restart.
4345  */
4346 static int iscsit_logout_post_handler(
4347         struct iscsi_cmd *cmd,
4348         struct iscsi_conn *conn)
4349 {
4350         int ret = 0;
4351
4352         switch (cmd->logout_reason) {
4353         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4354                 switch (cmd->logout_response) {
4355                 case ISCSI_LOGOUT_SUCCESS:
4356                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4357                 default:
4358                         iscsit_logout_post_handler_closesession(conn);
4359                         break;
4360                 }
4361                 ret = 0;
4362                 break;
4363         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4364                 if (conn->cid == cmd->logout_cid) {
4365                         switch (cmd->logout_response) {
4366                         case ISCSI_LOGOUT_SUCCESS:
4367                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4368                         default:
4369                                 iscsit_logout_post_handler_samecid(conn);
4370                                 break;
4371                         }
4372                         ret = 0;
4373                 } else {
4374                         switch (cmd->logout_response) {
4375                         case ISCSI_LOGOUT_SUCCESS:
4376                                 iscsit_logout_post_handler_diffcid(conn,
4377                                         cmd->logout_cid);
4378                                 break;
4379                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4380                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4381                         default:
4382                                 break;
4383                         }
4384                         ret = 1;
4385                 }
4386                 break;
4387         case ISCSI_LOGOUT_REASON_RECOVERY:
4388                 switch (cmd->logout_response) {
4389                 case ISCSI_LOGOUT_SUCCESS:
4390                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4391                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4392                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4393                 default:
4394                         break;
4395                 }
4396                 ret = 1;
4397                 break;
4398         default:
4399                 break;
4400
4401         }
4402         return ret;
4403 }
4404
4405 void iscsit_fail_session(struct iscsi_session *sess)
4406 {
4407         struct iscsi_conn *conn;
4408
4409         spin_lock_bh(&sess->conn_lock);
4410         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4411                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4412                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4413         }
4414         spin_unlock_bh(&sess->conn_lock);
4415
4416         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4417         sess->session_state = TARG_SESS_STATE_FAILED;
4418 }
4419
4420 int iscsit_free_session(struct iscsi_session *sess)
4421 {
4422         u16 conn_count = atomic_read(&sess->nconn);
4423         struct iscsi_conn *conn, *conn_tmp = NULL;
4424         int is_last;
4425
4426         spin_lock_bh(&sess->conn_lock);
4427         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4428
4429         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4430                         conn_list) {
4431                 if (conn_count == 0)
4432                         break;
4433
4434                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4435                         is_last = 1;
4436                 } else {
4437                         iscsit_inc_conn_usage_count(conn_tmp);
4438                         is_last = 0;
4439                 }
4440                 iscsit_inc_conn_usage_count(conn);
4441
4442                 spin_unlock_bh(&sess->conn_lock);
4443                 iscsit_cause_connection_reinstatement(conn, 1);
4444                 spin_lock_bh(&sess->conn_lock);
4445
4446                 iscsit_dec_conn_usage_count(conn);
4447                 if (is_last == 0)
4448                         iscsit_dec_conn_usage_count(conn_tmp);
4449
4450                 conn_count--;
4451         }
4452
4453         if (atomic_read(&sess->nconn)) {
4454                 spin_unlock_bh(&sess->conn_lock);
4455                 wait_for_completion(&sess->session_wait_comp);
4456         } else
4457                 spin_unlock_bh(&sess->conn_lock);
4458
4459         iscsit_close_session(sess);
4460         return 0;
4461 }
4462
4463 void iscsit_stop_session(
4464         struct iscsi_session *sess,
4465         int session_sleep,
4466         int connection_sleep)
4467 {
4468         u16 conn_count = atomic_read(&sess->nconn);
4469         struct iscsi_conn *conn, *conn_tmp = NULL;
4470         int is_last;
4471
4472         spin_lock_bh(&sess->conn_lock);
4473         if (session_sleep)
4474                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4475
4476         if (connection_sleep) {
4477                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4478                                 conn_list) {
4479                         if (conn_count == 0)
4480                                 break;
4481
4482                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4483                                 is_last = 1;
4484                         } else {
4485                                 iscsit_inc_conn_usage_count(conn_tmp);
4486                                 is_last = 0;
4487                         }
4488                         iscsit_inc_conn_usage_count(conn);
4489
4490                         spin_unlock_bh(&sess->conn_lock);
4491                         iscsit_cause_connection_reinstatement(conn, 1);
4492                         spin_lock_bh(&sess->conn_lock);
4493
4494                         iscsit_dec_conn_usage_count(conn);
4495                         if (is_last == 0)
4496                                 iscsit_dec_conn_usage_count(conn_tmp);
4497                         conn_count--;
4498                 }
4499         } else {
4500                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4501                         iscsit_cause_connection_reinstatement(conn, 0);
4502         }
4503
4504         if (session_sleep && atomic_read(&sess->nconn)) {
4505                 spin_unlock_bh(&sess->conn_lock);
4506                 wait_for_completion(&sess->session_wait_comp);
4507         } else
4508                 spin_unlock_bh(&sess->conn_lock);
4509 }
4510
4511 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4512 {
4513         struct iscsi_session *sess;
4514         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4515         struct se_session *se_sess, *se_sess_tmp;
4516         int session_count = 0;
4517
4518         spin_lock_bh(&se_tpg->session_lock);
4519         if (tpg->nsessions && !force) {
4520                 spin_unlock_bh(&se_tpg->session_lock);
4521                 return -1;
4522         }
4523
4524         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4525                         sess_list) {
4526                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4527
4528                 spin_lock(&sess->conn_lock);
4529                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4530                     atomic_read(&sess->session_logout) ||
4531                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4532                         spin_unlock(&sess->conn_lock);
4533                         continue;
4534                 }
4535                 atomic_set(&sess->session_reinstatement, 1);
4536                 spin_unlock(&sess->conn_lock);
4537                 spin_unlock_bh(&se_tpg->session_lock);
4538
4539                 iscsit_free_session(sess);
4540                 spin_lock_bh(&se_tpg->session_lock);
4541
4542                 session_count++;
4543         }
4544         spin_unlock_bh(&se_tpg->session_lock);
4545
4546         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4547                         " Group: %hu\n", session_count, tpg->tpgt);
4548         return 0;
4549 }
4550
4551 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4552 MODULE_VERSION("4.1.x");
4553 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4554 MODULE_LICENSE("GPL");
4555
4556 module_init(iscsi_target_init_module);
4557 module_exit(iscsi_target_cleanup_module);