drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <linux/idr.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/iscsi_proto.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_fabric.h>
  33 #include <target/target_core_configfs.h>
  34
  35 #include "iscsi_target_core.h"
  36 #include "iscsi_target_parameters.h"
  37 #include "iscsi_target_seq_pdu_list.h"
  38 #include "iscsi_target_tq.h"
  39 #include "iscsi_target_configfs.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include "iscsi_target_stat.h"
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_SPINLOCK(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_cmd_cache;
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         unsigned char *buf, u32);
  72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  73
  74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  75 {
  76         struct iscsi_tiqn *tiqn = NULL;
  77
  78         spin_lock(&tiqn_lock);
  79         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  80                 if (!strcmp(tiqn->tiqn, buf)) {
  81
  82                         spin_lock(&tiqn->tiqn_state_lock);
  83                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  84                                 tiqn->tiqn_access_count++;
  85                                 spin_unlock(&tiqn->tiqn_state_lock);
  86                                 spin_unlock(&tiqn_lock);
  87                                 return tiqn;
  88                         }
  89                         spin_unlock(&tiqn->tiqn_state_lock);
  90                 }
  91         }
  92         spin_unlock(&tiqn_lock);
  93
  94         return NULL;
  95 }
  96
  97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  98 {
  99         spin_lock(&tiqn->tiqn_state_lock);
 100         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 101                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 102                 spin_unlock(&tiqn->tiqn_state_lock);
 103                 return 0;
 104         }
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106
 107         return -1;
 108 }
 109
 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 111 {
 112         spin_lock(&tiqn->tiqn_state_lock);
 113         tiqn->tiqn_access_count--;
 114         spin_unlock(&tiqn->tiqn_state_lock);
 115 }
 116
 117 /*
 118  * Note that IQN formatting is expected to be done in userspace, and
 119  * no explict IQN format checks are done here.
 120  */
 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 122 {
 123         struct iscsi_tiqn *tiqn = NULL;
 124         int ret;
 125
 126         if (strlen(buf) >= ISCSI_IQN_LEN) {
 127                 pr_err("Target IQN exceeds %d bytes\n",
 128                                 ISCSI_IQN_LEN);
 129                 return ERR_PTR(-EINVAL);
 130         }
 131
 132         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 133         if (!tiqn) {
 134                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 135                 return ERR_PTR(-ENOMEM);
 136         }
 137
 138         sprintf(tiqn->tiqn, "%s", buf);
 139         INIT_LIST_HEAD(&tiqn->tiqn_list);
 140         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 141         spin_lock_init(&tiqn->tiqn_state_lock);
 142         spin_lock_init(&tiqn->tiqn_tpg_lock);
 143         spin_lock_init(&tiqn->sess_err_stats.lock);
 144         spin_lock_init(&tiqn->login_stats.lock);
 145         spin_lock_init(&tiqn->logout_stats.lock);
 146
 147         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 148                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 149                 kfree(tiqn);
 150                 return ERR_PTR(-ENOMEM);
 151         }
 152         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 153
 154         spin_lock(&tiqn_lock);
 155         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 156         if (ret < 0) {
 157                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 158                 spin_unlock(&tiqn_lock);
 159                 kfree(tiqn);
 160                 return ERR_PTR(ret);
 161         }
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163         spin_unlock(&tiqn_lock);
 164
 165         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 166
 167         return tiqn;
 168
 169 }
 170
 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 172 {
 173         /*
 174          * Wait for accesses to said struct iscsi_tiqn to end.
 175          */
 176         spin_lock(&tiqn->tiqn_state_lock);
 177         while (tiqn->tiqn_access_count != 0) {
 178                 spin_unlock(&tiqn->tiqn_state_lock);
 179                 msleep(10);
 180                 spin_lock(&tiqn->tiqn_state_lock);
 181         }
 182         spin_unlock(&tiqn->tiqn_state_lock);
 183 }
 184
 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 186 {
 187         /*
 188          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 189          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 190          * attempts to access this struct iscsi_tiqn will fail from both transport
 191          * fabric and control code paths.
 192          */
 193         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 194                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 195                 return;
 196         }
 197
 198         iscsit_wait_for_tiqn(tiqn);
 199
 200         spin_lock(&tiqn_lock);
 201         list_del(&tiqn->tiqn_list);
 202         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 203         spin_unlock(&tiqn_lock);
 204
 205         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 206                         tiqn->tiqn);
 207         kfree(tiqn);
 208 }
 209
 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 211 {
 212         int ret;
 213         /*
 214          * Determine if the network portal is accepting storage traffic.
 215          */
 216         spin_lock_bh(&np->np_thread_lock);
 217         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 218                 spin_unlock_bh(&np->np_thread_lock);
 219                 return -1;
 220         }
 221         if (np->np_login_tpg) {
 222                 pr_err("np->np_login_tpg() is not NULL!\n");
 223                 spin_unlock_bh(&np->np_thread_lock);
 224                 return -1;
 225         }
 226         spin_unlock_bh(&np->np_thread_lock);
 227         /*
 228          * Determine if the portal group is accepting storage traffic.
 229          */
 230         spin_lock_bh(&tpg->tpg_state_lock);
 231         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 232                 spin_unlock_bh(&tpg->tpg_state_lock);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         /*
 238          * Here we serialize access across the TIQN+TPG Tuple.
 239          */
 240         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 241         if ((ret != 0) || signal_pending(current))
 242                 return -1;
 243
 244         spin_lock_bh(&np->np_thread_lock);
 245         np->np_login_tpg = tpg;
 246         spin_unlock_bh(&np->np_thread_lock);
 247
 248         return 0;
 249 }
 250
 251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 252 {
 253         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 254
 255         spin_lock_bh(&np->np_thread_lock);
 256         np->np_login_tpg = NULL;
 257         spin_unlock_bh(&np->np_thread_lock);
 258
 259         mutex_unlock(&tpg->np_login_lock);
 260
 261         if (tiqn)
 262                 iscsit_put_tiqn_for_login(tiqn);
 263
 264         return 0;
 265 }
 266
 267 static struct iscsi_np *iscsit_get_np(
 268         struct __kernel_sockaddr_storage *sockaddr,
 269         int network_transport)
 270 {
 271         struct sockaddr_in *sock_in, *sock_in_e;
 272         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 273         struct iscsi_np *np;
 274         int ip_match = 0;
 275         u16 port;
 276
 277         spin_lock_bh(&np_lock);
 278         list_for_each_entry(np, &g_np_list, np_list) {
 279                 spin_lock(&np->np_thread_lock);
 280                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 281                         spin_unlock(&np->np_thread_lock);
 282                         continue;
 283                 }
 284
 285                 if (sockaddr->ss_family == AF_INET6) {
 286                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 287                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 288
 289                         if (!memcmp(&sock_in6->sin6_addr.in6_u,
 290                                     &sock_in6_e->sin6_addr.in6_u,
 291                                     sizeof(struct in6_addr)))
 292                                 ip_match = 1;
 293
 294                         port = ntohs(sock_in6->sin6_port);
 295                 } else {
 296                         sock_in = (struct sockaddr_in *)sockaddr;
 297                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 298
 299                         if (sock_in->sin_addr.s_addr ==
 300                             sock_in_e->sin_addr.s_addr)
 301                                 ip_match = 1;
 302
 303                         port = ntohs(sock_in->sin_port);
 304                 }
 305
 306                 if ((ip_match == 1) && (np->np_port == port) &&
 307                     (np->np_network_transport == network_transport)) {
 308                         /*
 309                          * Increment the np_exports reference count now to
 310                          * prevent iscsit_del_np() below from being called
 311                          * while iscsi_tpg_add_network_portal() is called.
 312                          */
 313                         np->np_exports++;
 314                         spin_unlock(&np->np_thread_lock);
 315                         spin_unlock_bh(&np_lock);
 316                         return np;
 317                 }
 318                 spin_unlock(&np->np_thread_lock);
 319         }
 320         spin_unlock_bh(&np_lock);
 321
 322         return NULL;
 323 }
 324
 325 struct iscsi_np *iscsit_add_np(
 326         struct __kernel_sockaddr_storage *sockaddr,
 327         char *ip_str,
 328         int network_transport)
 329 {
 330         struct sockaddr_in *sock_in;
 331         struct sockaddr_in6 *sock_in6;
 332         struct iscsi_np *np;
 333         int ret;
 334         /*
 335          * Locate the existing struct iscsi_np if already active..
 336          */
 337         np = iscsit_get_np(sockaddr, network_transport);
 338         if (np)
 339                 return np;
 340
 341         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 342         if (!np) {
 343                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 344                 return ERR_PTR(-ENOMEM);
 345         }
 346
 347         np->np_flags |= NPF_IP_NETWORK;
 348         if (sockaddr->ss_family == AF_INET6) {
 349                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 350                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 351                 np->np_port = ntohs(sock_in6->sin6_port);
 352         } else {
 353                 sock_in = (struct sockaddr_in *)sockaddr;
 354                 sprintf(np->np_ip, "%s", ip_str);
 355                 np->np_port = ntohs(sock_in->sin_port);
 356         }
 357
 358         np->np_network_transport = network_transport;
 359         spin_lock_init(&np->np_thread_lock);
 360         init_completion(&np->np_restart_comp);
 361         INIT_LIST_HEAD(&np->np_list);
 362
 363         ret = iscsi_target_setup_login_socket(np, sockaddr);
 364         if (ret != 0) {
 365                 kfree(np);
 366                 return ERR_PTR(ret);
 367         }
 368
 369         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 370         if (IS_ERR(np->np_thread)) {
 371                 pr_err("Unable to create kthread: iscsi_np\n");
 372                 ret = PTR_ERR(np->np_thread);
 373                 kfree(np);
 374                 return ERR_PTR(ret);
 375         }
 376         /*
 377          * Increment the np_exports reference count now to prevent
 378          * iscsit_del_np() below from being run while a new call to
 379          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 380          * active.  We don't need to hold np->np_thread_lock at this
 381          * point because iscsi_np has not been added to g_np_list yet.
 382          */
 383         np->np_exports = 1;
 384
 385         spin_lock_bh(&np_lock);
 386         list_add_tail(&np->np_list, &g_np_list);
 387         spin_unlock_bh(&np_lock);
 388
 389         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 390                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 391                 "TCP" : "SCTP");
 392
 393         return np;
 394 }
 395
 396 int iscsit_reset_np_thread(
 397         struct iscsi_np *np,
 398         struct iscsi_tpg_np *tpg_np,
 399         struct iscsi_portal_group *tpg)
 400 {
 401         spin_lock_bh(&np->np_thread_lock);
 402         if (tpg && tpg_np) {
 403                 /*
 404                  * The reset operation need only be performed when the
 405                  * passed struct iscsi_portal_group has a login in progress
 406                  * to one of the network portals.
 407                  */
 408                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 409                         spin_unlock_bh(&np->np_thread_lock);
 410                         return 0;
 411                 }
 412         }
 413         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 414                 spin_unlock_bh(&np->np_thread_lock);
 415                 return 0;
 416         }
 417         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 418
 419         if (np->np_thread) {
 420                 spin_unlock_bh(&np->np_thread_lock);
 421                 send_sig(SIGINT, np->np_thread, 1);
 422                 wait_for_completion(&np->np_restart_comp);
 423                 spin_lock_bh(&np->np_thread_lock);
 424         }
 425         spin_unlock_bh(&np->np_thread_lock);
 426
 427         return 0;
 428 }
 429
 430 static int iscsit_del_np_comm(struct iscsi_np *np)
 431 {
 432         if (np->np_socket)
 433                 sock_release(np->np_socket);
 434         return 0;
 435 }
 436
 437 int iscsit_del_np(struct iscsi_np *np)
 438 {
 439         spin_lock_bh(&np->np_thread_lock);
 440         np->np_exports--;
 441         if (np->np_exports) {
 442                 spin_unlock_bh(&np->np_thread_lock);
 443                 return 0;
 444         }
 445         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 446         spin_unlock_bh(&np->np_thread_lock);
 447
 448         if (np->np_thread) {
 449                 /*
 450                  * We need to send the signal to wakeup Linux/Net
 451                  * which may be sleeping in sock_accept()..
 452                  */
 453                 send_sig(SIGINT, np->np_thread, 1);
 454                 kthread_stop(np->np_thread);
 455         }
 456         iscsit_del_np_comm(np);
 457
 458         spin_lock_bh(&np_lock);
 459         list_del(&np->np_list);
 460         spin_unlock_bh(&np_lock);
 461
 462         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 463                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 464                 "TCP" : "SCTP");
 465
 466         kfree(np);
 467         return 0;
 468 }
 469
 470 static int __init iscsi_target_init_module(void)
 471 {
 472         int ret = 0;
 473
 474         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 475
 476         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 477         if (!iscsit_global) {
 478                 pr_err("Unable to allocate memory for iscsit_global\n");
 479                 return -1;
 480         }
 481         mutex_init(&auth_id_lock);
 482         spin_lock_init(&sess_idr_lock);
 483         idr_init(&tiqn_idr);
 484         idr_init(&sess_idr);
 485
 486         ret = iscsi_target_register_configfs();
 487         if (ret < 0)
 488                 goto out;
 489
 490         ret = iscsi_thread_set_init();
 491         if (ret < 0)
 492                 goto configfs_out;
 493
 494         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 495                         TARGET_THREAD_SET_COUNT) {
 496                 pr_err("iscsi_allocate_thread_sets() returned"
 497                         " unexpected value!\n");
 498                 goto ts_out1;
 499         }
 500
 501         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 502                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 503                         0, NULL);
 504         if (!lio_cmd_cache) {
 505                 pr_err("Unable to kmem_cache_create() for"
 506                                 " lio_cmd_cache\n");
 507                 goto ts_out2;
 508         }
 509
 510         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 511                         sizeof(struct iscsi_queue_req),
 512                         __alignof__(struct iscsi_queue_req), 0, NULL);
 513         if (!lio_qr_cache) {
 514                 pr_err("nable to kmem_cache_create() for"
 515                                 " lio_qr_cache\n");
 516                 goto cmd_out;
 517         }
 518
 519         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 520                         sizeof(struct iscsi_datain_req),
 521                         __alignof__(struct iscsi_datain_req), 0, NULL);
 522         if (!lio_dr_cache) {
 523                 pr_err("Unable to kmem_cache_create() for"
 524                                 " lio_dr_cache\n");
 525                 goto qr_out;
 526         }
 527
 528         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 529                         sizeof(struct iscsi_ooo_cmdsn),
 530                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 531         if (!lio_ooo_cache) {
 532                 pr_err("Unable to kmem_cache_create() for"
 533                                 " lio_ooo_cache\n");
 534                 goto dr_out;
 535         }
 536
 537         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 538                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 539                         0, NULL);
 540         if (!lio_r2t_cache) {
 541                 pr_err("Unable to kmem_cache_create() for"
 542                                 " lio_r2t_cache\n");
 543                 goto ooo_out;
 544         }
 545
 546         if (iscsit_load_discovery_tpg() < 0)
 547                 goto r2t_out;
 548
 549         return ret;
 550 r2t_out:
 551         kmem_cache_destroy(lio_r2t_cache);
 552 ooo_out:
 553         kmem_cache_destroy(lio_ooo_cache);
 554 dr_out:
 555         kmem_cache_destroy(lio_dr_cache);
 556 qr_out:
 557         kmem_cache_destroy(lio_qr_cache);
 558 cmd_out:
 559         kmem_cache_destroy(lio_cmd_cache);
 560 ts_out2:
 561         iscsi_deallocate_thread_sets();
 562 ts_out1:
 563         iscsi_thread_set_free();
 564 configfs_out:
 565         iscsi_target_deregister_configfs();
 566 out:
 567         kfree(iscsit_global);
 568         return -ENOMEM;
 569 }
 570
 571 static void __exit iscsi_target_cleanup_module(void)
 572 {
 573         iscsi_deallocate_thread_sets();
 574         iscsi_thread_set_free();
 575         iscsit_release_discovery_tpg();
 576         kmem_cache_destroy(lio_cmd_cache);
 577         kmem_cache_destroy(lio_qr_cache);
 578         kmem_cache_destroy(lio_dr_cache);
 579         kmem_cache_destroy(lio_ooo_cache);
 580         kmem_cache_destroy(lio_r2t_cache);
 581
 582         iscsi_target_deregister_configfs();
 583
 584         kfree(iscsit_global);
 585 }
 586
 587 static int iscsit_add_reject(
 588         u8 reason,
 589         int fail_conn,
 590         unsigned char *buf,
 591         struct iscsi_conn *conn)
 592 {
 593         struct iscsi_cmd *cmd;
 594         struct iscsi_reject *hdr;
 595         int ret;
 596
 597         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 598         if (!cmd)
 599                 return -1;
 600
 601         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 602         if (fail_conn)
 603                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 604
 605         hdr     = (struct iscsi_reject *) cmd->pdu;
 606         hdr->reason = reason;
 607
 608         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 609         if (!cmd->buf_ptr) {
 610                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 611                 iscsit_release_cmd(cmd);
 612                 return -1;
 613         }
 614
 615         spin_lock_bh(&conn->cmd_lock);
 616         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 617         spin_unlock_bh(&conn->cmd_lock);
 618
 619         cmd->i_state = ISTATE_SEND_REJECT;
 620         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 621
 622         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 623         if (ret != 0)
 624                 return -1;
 625
 626         return (!fail_conn) ? 0 : -1;
 627 }
 628
 629 int iscsit_add_reject_from_cmd(
 630         u8 reason,
 631         int fail_conn,
 632         int add_to_conn,
 633         unsigned char *buf,
 634         struct iscsi_cmd *cmd)
 635 {
 636         struct iscsi_conn *conn;
 637         struct iscsi_reject *hdr;
 638         int ret;
 639
 640         if (!cmd->conn) {
 641                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 642                                 cmd->init_task_tag);
 643                 return -1;
 644         }
 645         conn = cmd->conn;
 646
 647         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 648         if (fail_conn)
 649                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 650
 651         hdr     = (struct iscsi_reject *) cmd->pdu;
 652         hdr->reason = reason;
 653
 654         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 655         if (!cmd->buf_ptr) {
 656                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 657                 iscsit_release_cmd(cmd);
 658                 return -1;
 659         }
 660
 661         if (add_to_conn) {
 662                 spin_lock_bh(&conn->cmd_lock);
 663                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 664                 spin_unlock_bh(&conn->cmd_lock);
 665         }
 666
 667         cmd->i_state = ISTATE_SEND_REJECT;
 668         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 669
 670         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 671         if (ret != 0)
 672                 return -1;
 673
 674         return (!fail_conn) ? 0 : -1;
 675 }
 676
 677 /*
 678  * Map some portion of the allocated scatterlist to an iovec, suitable for
 679  * kernel sockets to copy data in/out.
 680  */
 681 static int iscsit_map_iovec(
 682         struct iscsi_cmd *cmd,
 683         struct kvec *iov,
 684         u32 data_offset,
 685         u32 data_length)
 686 {
 687         u32 i = 0;
 688         struct scatterlist *sg;
 689         unsigned int page_off;
 690
 691         /*
 692          * We know each entry in t_data_sg contains a page.
 693          */
 694         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 695         page_off = (data_offset % PAGE_SIZE);
 696
 697         cmd->first_data_sg = sg;
 698         cmd->first_data_sg_off = page_off;
 699
 700         while (data_length) {
 701                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 702
 703                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 704                 iov[i].iov_len = cur_len;
 705
 706                 data_length -= cur_len;
 707                 page_off = 0;
 708                 sg = sg_next(sg);
 709                 i++;
 710         }
 711
 712         cmd->kmapped_nents = i;
 713
 714         return i;
 715 }
 716
 717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 718 {
 719         u32 i;
 720         struct scatterlist *sg;
 721
 722         sg = cmd->first_data_sg;
 723
 724         for (i = 0; i < cmd->kmapped_nents; i++)
 725                 kunmap(sg_page(&sg[i]));
 726 }
 727
 728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 729 {
 730         struct iscsi_cmd *cmd;
 731
 732         conn->exp_statsn = exp_statsn;
 733
 734         spin_lock_bh(&conn->cmd_lock);
 735         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 736                 spin_lock(&cmd->istate_lock);
 737                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 738                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 739                         cmd->i_state = ISTATE_REMOVE;
 740                         spin_unlock(&cmd->istate_lock);
 741                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 742                                                 cmd->i_state);
 743                         continue;
 744                 }
 745                 spin_unlock(&cmd->istate_lock);
 746         }
 747         spin_unlock_bh(&conn->cmd_lock);
 748 }
 749
 750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 751 {
 752         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 753
 754         iov_count += ISCSI_IOV_DATA_BUFFER;
 755
 756         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 757         if (!cmd->iov_data) {
 758                 pr_err("Unable to allocate cmd->iov_data\n");
 759                 return -ENOMEM;
 760         }
 761
 762         cmd->orig_iov_data_count = iov_count;
 763         return 0;
 764 }
 765
 766 static int iscsit_handle_scsi_cmd(
 767         struct iscsi_conn *conn,
 768         unsigned char *buf)
 769 {
 770         int data_direction, payload_length, cmdsn_ret = 0, immed_ret;
 771         struct iscsi_cmd *cmd = NULL;
 772         struct iscsi_scsi_req *hdr;
 773         int iscsi_task_attr;
 774         int sam_task_attr;
 775
 776         spin_lock_bh(&conn->sess->session_stats_lock);
 777         conn->sess->cmd_pdus++;
 778         if (conn->sess->se_sess->se_node_acl) {
 779                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 780                 conn->sess->se_sess->se_node_acl->num_cmds++;
 781                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 782         }
 783         spin_unlock_bh(&conn->sess->session_stats_lock);
 784
 785         hdr                     = (struct iscsi_scsi_req *) buf;
 786         payload_length          = ntoh24(hdr->dlength);
 787
 788         /* FIXME; Add checks for AdditionalHeaderSegment */
 789
 790         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 791             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 792                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 793                                 " not set. Bad iSCSI Initiator.\n");
 794                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 795                                 buf, conn);
 796         }
 797
 798         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 799              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 800                 /*
 801                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 802                  * that adds support for RESERVE/RELEASE.  There is a bug
 803                  * add with this new functionality that sets R/W bits when
 804                  * neither CDB carries any READ or WRITE datapayloads.
 805                  */
 806                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 807                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 808                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 809                         goto done;
 810                 }
 811
 812                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 813                         " set when Expected Data Transfer Length is 0 for"
 814                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 815                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 816                                 buf, conn);
 817         }
 818 done:
 819
 820         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 821             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 822                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 823                         " MUST be set if Expected Data Transfer Length is not 0."
 824                         " Bad iSCSI Initiator\n");
 825                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 826                                 buf, conn);
 827         }
 828
 829         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 830             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 831                 pr_err("Bidirectional operations not supported!\n");
 832                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 833                                 buf, conn);
 834         }
 835
 836         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 837                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 838                                 " Scsi Command PDU.\n");
 839                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 840                                 buf, conn);
 841         }
 842
 843         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 844                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 845                         " protocol error.\n", payload_length);
 846                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 847                                 buf, conn);
 848         }
 849
 850         if ((be32_to_cpu(hdr->data_length )== payload_length) &&
 851             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 852                 pr_err("Expected Data Transfer Length and Length of"
 853                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 854                         " bit is not set protocol error\n");
 855                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 856                                 buf, conn);
 857         }
 858
 859         if (payload_length > be32_to_cpu(hdr->data_length)) {
 860                 pr_err("DataSegmentLength: %u is greater than"
 861                         " EDTL: %u, protocol error.\n", payload_length,
 862                                 hdr->data_length);
 863                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 864                                 buf, conn);
 865         }
 866
 867         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 868                 pr_err("DataSegmentLength: %u is greater than"
 869                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 870                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 871                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 872                                 buf, conn);
 873         }
 874
 875         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 876                 pr_err("DataSegmentLength: %u is greater than"
 877                         " FirstBurstLength: %u, protocol error.\n",
 878                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 879                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 880                                         buf, conn);
 881         }
 882
 883         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 884                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 885                           DMA_NONE;
 886
 887         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 888         if (!cmd)
 889                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 890                                          buf, conn);
 891
 892         cmd->data_direction = data_direction;
 893         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 894         /*
 895          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 896          */
 897         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 898             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 899                 sam_task_attr = MSG_SIMPLE_TAG;
 900         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 901                 sam_task_attr = MSG_ORDERED_TAG;
 902         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 903                 sam_task_attr = MSG_HEAD_TAG;
 904         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 905                 sam_task_attr = MSG_ACA_TAG;
 906         else {
 907                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 908                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 909                 sam_task_attr = MSG_SIMPLE_TAG;
 910         }
 911
 912         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 913         cmd->i_state            = ISTATE_NEW_CMD;
 914         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 915         cmd->immediate_data     = (payload_length) ? 1 : 0;
 916         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 917                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 918         if (cmd->unsolicited_data)
 919                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 920
 921         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 922         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 923                 spin_lock_bh(&conn->sess->ttt_lock);
 924                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 925                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 926                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 927                 spin_unlock_bh(&conn->sess->ttt_lock);
 928         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 929                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 930         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 931         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 932         cmd->first_burst_len    = payload_length;
 933
 934         if (cmd->data_direction == DMA_FROM_DEVICE) {
 935                 struct iscsi_datain_req *dr;
 936
 937                 dr = iscsit_allocate_datain_req();
 938                 if (!dr)
 939                         return iscsit_add_reject_from_cmd(
 940                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 941                                         1, 1, buf, cmd);
 942
 943                 iscsit_attach_datain_req(cmd, dr);
 944         }
 945
 946         /*
 947          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 948          */
 949         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 950                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 951                         cmd->data_direction, sam_task_attr,
 952                         cmd->sense_buffer + 2);
 953
 954         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 955                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 956                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 957
 958         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 959                                                      scsilun_to_int(&hdr->lun));
 960         if (cmd->sense_reason)
 961                 goto attach_cmd;
 962
 963         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 964         if (cmd->sense_reason) {
 965                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
 966                         return iscsit_add_reject_from_cmd(
 967                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 968                                         1, 1, buf, cmd);
 969                 }
 970
 971                 goto attach_cmd;
 972         }
 973
 974         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
 975                 return iscsit_add_reject_from_cmd(
 976                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 977                         1, 1, buf, cmd);
 978         }
 979
 980 attach_cmd:
 981         spin_lock_bh(&conn->cmd_lock);
 982         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 983         spin_unlock_bh(&conn->cmd_lock);
 984         /*
 985          * Check if we need to delay processing because of ALUA
 986          * Active/NonOptimized primary access state..
 987          */
 988         core_alua_check_nonop_delay(&cmd->se_cmd);
 989
 990         if (iscsit_allocate_iovecs(cmd) < 0) {
 991                 return iscsit_add_reject_from_cmd(
 992                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 993                                 1, 0, buf, cmd);
 994         }
 995
 996         /*
 997          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
 998          * the Immediate Bit is not set, and no Immediate
 999          * Data is attached.
1000          *
1001          * A PDU/CmdSN carrying Immediate Data can only
1002          * be processed after the DataCRC has passed.
1003          * If the DataCRC fails, the CmdSN MUST NOT
1004          * be acknowledged. (See below)
1005          */
1006         if (!cmd->immediate_data) {
1007                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1008                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1009                         return 0;
1010                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1011                         return iscsit_add_reject_from_cmd(
1012                                 ISCSI_REASON_PROTOCOL_ERROR,
1013                                 1, 0, buf, cmd);
1014         }
1015
1016         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1017
1018         /*
1019          * If no Immediate Data is attached, it's OK to return now.
1020          */
1021         if (!cmd->immediate_data) {
1022                 if (!cmd->sense_reason && cmd->unsolicited_data) {
1023                         iscsit_set_dataout_sequence_values(cmd);
1024
1025                         spin_lock_bh(&cmd->dataout_timeout_lock);
1026                         iscsit_start_dataout_timer(cmd, cmd->conn);
1027                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1028                 }
1029
1030                 return 0;
1031         }
1032
1033         /*
1034          * Early CHECK_CONDITIONs never make it to the transport processing
1035          * thread.  They are processed in CmdSN order by
1036          * iscsit_check_received_cmdsn() below.
1037          */
1038         if (cmd->sense_reason) {
1039                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1040                 goto after_immediate_data;
1041         }
1042         /*
1043          * Call directly into transport_generic_new_cmd() to perform
1044          * the backend memory allocation.
1045          */
1046         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1047         if (cmd->sense_reason) {
1048                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1049                 goto after_immediate_data;
1050         }
1051
1052         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1053 after_immediate_data:
1054         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1055                 /*
1056                  * A PDU/CmdSN carrying Immediate Data passed
1057                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1058                  * Immediate Bit is not set.
1059                  */
1060                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1061                 /*
1062                  * Special case for Unsupported SAM WRITE Opcodes
1063                  * and ImmediateData=Yes.
1064                  */
1065                 if (cmd->sense_reason) {
1066                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1067                                 return -1;
1068                 } else if (cmd->unsolicited_data) {
1069                         iscsit_set_dataout_sequence_values(cmd);
1070
1071                         spin_lock_bh(&cmd->dataout_timeout_lock);
1072                         iscsit_start_dataout_timer(cmd, cmd->conn);
1073                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1074                 }
1075
1076                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1077                         return iscsit_add_reject_from_cmd(
1078                                 ISCSI_REASON_PROTOCOL_ERROR,
1079                                 1, 0, buf, cmd);
1080
1081         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1082                 /*
1083                  * Immediate Data failed DataCRC and ERL>=1,
1084                  * silently drop this PDU and let the initiator
1085                  * plug the CmdSN gap.
1086                  *
1087                  * FIXME: Send Unsolicited NOPIN with reserved
1088                  * TTT here to help the initiator figure out
1089                  * the missing CmdSN, although they should be
1090                  * intelligent enough to determine the missing
1091                  * CmdSN and issue a retry to plug the sequence.
1092                  */
1093                 cmd->i_state = ISTATE_REMOVE;
1094                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1095         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1096                 return -1;
1097
1098         return 0;
1099 }
1100
1101 static u32 iscsit_do_crypto_hash_sg(
1102         struct hash_desc *hash,
1103         struct iscsi_cmd *cmd,
1104         u32 data_offset,
1105         u32 data_length,
1106         u32 padding,
1107         u8 *pad_bytes)
1108 {
1109         u32 data_crc;
1110         u32 i;
1111         struct scatterlist *sg;
1112         unsigned int page_off;
1113
1114         crypto_hash_init(hash);
1115
1116         sg = cmd->first_data_sg;
1117         page_off = cmd->first_data_sg_off;
1118
1119         i = 0;
1120         while (data_length) {
1121                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1122
1123                 crypto_hash_update(hash, &sg[i], cur_len);
1124
1125                 data_length -= cur_len;
1126                 page_off = 0;
1127                 i++;
1128         }
1129
1130         if (padding) {
1131                 struct scatterlist pad_sg;
1132
1133                 sg_init_one(&pad_sg, pad_bytes, padding);
1134                 crypto_hash_update(hash, &pad_sg, padding);
1135         }
1136         crypto_hash_final(hash, (u8 *) &data_crc);
1137
1138         return data_crc;
1139 }
1140
1141 static void iscsit_do_crypto_hash_buf(
1142         struct hash_desc *hash,
1143         unsigned char *buf,
1144         u32 payload_length,
1145         u32 padding,
1146         u8 *pad_bytes,
1147         u8 *data_crc)
1148 {
1149         struct scatterlist sg;
1150
1151         crypto_hash_init(hash);
1152
1153         sg_init_one(&sg, buf, payload_length);
1154         crypto_hash_update(hash, &sg, payload_length);
1155
1156         if (padding) {
1157                 sg_init_one(&sg, pad_bytes, padding);
1158                 crypto_hash_update(hash, &sg, padding);
1159         }
1160         crypto_hash_final(hash, data_crc);
1161 }
1162
1163 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1164 {
1165         int iov_ret, ooo_cmdsn = 0, ret;
1166         u8 data_crc_failed = 0;
1167         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1168         u32 rx_size = 0, payload_length;
1169         struct iscsi_cmd *cmd = NULL;
1170         struct se_cmd *se_cmd;
1171         struct iscsi_data *hdr;
1172         struct kvec *iov;
1173         unsigned long flags;
1174
1175         hdr                     = (struct iscsi_data *) buf;
1176         payload_length          = ntoh24(hdr->dlength);
1177
1178         if (!payload_length) {
1179                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1180                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1181                                         buf, conn);
1182         }
1183
1184         /* iSCSI write */
1185         spin_lock_bh(&conn->sess->session_stats_lock);
1186         conn->sess->rx_data_octets += payload_length;
1187         if (conn->sess->se_sess->se_node_acl) {
1188                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1189                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1190                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1191         }
1192         spin_unlock_bh(&conn->sess->session_stats_lock);
1193
1194         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1195                 pr_err("DataSegmentLength: %u is greater than"
1196                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1197                         conn->conn_ops->MaxXmitDataSegmentLength);
1198                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1199                                         buf, conn);
1200         }
1201
1202         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1203                         payload_length);
1204         if (!cmd)
1205                 return 0;
1206
1207         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1208                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1209                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1210                 payload_length, conn->cid);
1211
1212         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1213                 pr_err("Command ITT: 0x%08x received DataOUT after"
1214                         " last DataOUT received, dumping payload\n",
1215                         cmd->init_task_tag);
1216                 return iscsit_dump_data_payload(conn, payload_length, 1);
1217         }
1218
1219         if (cmd->data_direction != DMA_TO_DEVICE) {
1220                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1221                         " NON-WRITE command.\n", cmd->init_task_tag);
1222                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1223                                 1, 0, buf, cmd);
1224         }
1225         se_cmd = &cmd->se_cmd;
1226         iscsit_mod_dataout_timer(cmd);
1227
1228         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1229                 pr_err("DataOut Offset: %u, Length %u greater than"
1230                         " iSCSI Command EDTL %u, protocol error.\n",
1231                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1232                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1233                                 1, 0, buf, cmd);
1234         }
1235
1236         if (cmd->unsolicited_data) {
1237                 int dump_unsolicited_data = 0;
1238
1239                 if (conn->sess->sess_ops->InitialR2T) {
1240                         pr_err("Received unexpected unsolicited data"
1241                                 " while InitialR2T=Yes, protocol error.\n");
1242                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1243                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1244                         return -1;
1245                 }
1246                 /*
1247                  * Special case for dealing with Unsolicited DataOUT
1248                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1249                  * failures;
1250                  */
1251
1252                 /* Something's amiss if we're not in WRITE_PENDING state... */
1253                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1254                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1255                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1256
1257                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1258                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1259                         dump_unsolicited_data = 1;
1260                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1261
1262                 if (dump_unsolicited_data) {
1263                         /*
1264                          * Check if a delayed TASK_ABORTED status needs to
1265                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1266                          * received with the unsolicitied data out.
1267                          */
1268                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1269                                 iscsit_stop_dataout_timer(cmd);
1270
1271                         transport_check_aborted_status(se_cmd,
1272                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1273                         return iscsit_dump_data_payload(conn, payload_length, 1);
1274                 }
1275         } else {
1276                 /*
1277                  * For the normal solicited data path:
1278                  *
1279                  * Check for a delayed TASK_ABORTED status and dump any
1280                  * incoming data out payload if one exists.  Also, when the
1281                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1282                  * data out sequence, we decrement outstanding_r2ts.  Once
1283                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1284                  * TASK_ABORTED status.
1285                  */
1286                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1287                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1288                                 if (--cmd->outstanding_r2ts < 1) {
1289                                         iscsit_stop_dataout_timer(cmd);
1290                                         transport_check_aborted_status(
1291                                                         se_cmd, 1);
1292                                 }
1293
1294                         return iscsit_dump_data_payload(conn, payload_length, 1);
1295                 }
1296         }
1297         /*
1298          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1299          * within-command recovery checks before receiving the payload.
1300          */
1301         ret = iscsit_check_pre_dataout(cmd, buf);
1302         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1303                 return 0;
1304         else if (ret == DATAOUT_CANNOT_RECOVER)
1305                 return -1;
1306
1307         rx_size += payload_length;
1308         iov = &cmd->iov_data[0];
1309
1310         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1311                                    payload_length);
1312         if (iov_ret < 0)
1313                 return -1;
1314
1315         iov_count += iov_ret;
1316
1317         padding = ((-payload_length) & 3);
1318         if (padding != 0) {
1319                 iov[iov_count].iov_base = cmd->pad_bytes;
1320                 iov[iov_count++].iov_len = padding;
1321                 rx_size += padding;
1322                 pr_debug("Receiving %u padding bytes.\n", padding);
1323         }
1324
1325         if (conn->conn_ops->DataDigest) {
1326                 iov[iov_count].iov_base = &checksum;
1327                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1328                 rx_size += ISCSI_CRC_LEN;
1329         }
1330
1331         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1332
1333         iscsit_unmap_iovec(cmd);
1334
1335         if (rx_got != rx_size)
1336                 return -1;
1337
1338         if (conn->conn_ops->DataDigest) {
1339                 u32 data_crc;
1340
1341                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1342                                                     be32_to_cpu(hdr->offset),
1343                                                     payload_length, padding,
1344                                                     cmd->pad_bytes);
1345
1346                 if (checksum != data_crc) {
1347                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1348                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1349                                 " does not match computed 0x%08x\n",
1350                                 hdr->itt, hdr->offset, payload_length,
1351                                 hdr->datasn, checksum, data_crc);
1352                         data_crc_failed = 1;
1353                 } else {
1354                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1355                                 " %u bytes of Data Out\n", checksum,
1356                                 payload_length);
1357                 }
1358         }
1359         /*
1360          * Increment post receive data and CRC values or perform
1361          * within-command recovery.
1362          */
1363         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1364         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1365                 return 0;
1366         else if (ret == DATAOUT_SEND_R2T) {
1367                 iscsit_set_dataout_sequence_values(cmd);
1368                 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1369         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1370                 /*
1371                  * Handle extra special case for out of order
1372                  * Unsolicited Data Out.
1373                  */
1374                 spin_lock_bh(&cmd->istate_lock);
1375                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1376                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1377                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1378                 spin_unlock_bh(&cmd->istate_lock);
1379
1380                 iscsit_stop_dataout_timer(cmd);
1381                 if (ooo_cmdsn)
1382                         return 0;
1383                 target_execute_cmd(&cmd->se_cmd);
1384                 return 0;
1385         } else /* DATAOUT_CANNOT_RECOVER */
1386                 return -1;
1387
1388         return 0;
1389 }
1390
1391 static int iscsit_handle_nop_out(
1392         struct iscsi_conn *conn,
1393         unsigned char *buf)
1394 {
1395         unsigned char *ping_data = NULL;
1396         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1397         u32 checksum, data_crc, padding = 0, payload_length;
1398         struct iscsi_cmd *cmd = NULL;
1399         struct kvec *iov = NULL;
1400         struct iscsi_nopout *hdr;
1401
1402         hdr                     = (struct iscsi_nopout *) buf;
1403         payload_length          = ntoh24(hdr->dlength);
1404
1405         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1406                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1407                         " not set, protocol error.\n");
1408                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1409                                         buf, conn);
1410         }
1411
1412         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1413                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1414                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1415                         " error.\n", payload_length,
1416                         conn->conn_ops->MaxXmitDataSegmentLength);
1417                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1418                                         buf, conn);
1419         }
1420
1421         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1422                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1423                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1424                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1425                 payload_length);
1426         /*
1427          * This is not a response to a Unsolicited NopIN, which means
1428          * it can either be a NOPOUT ping request (with a valid ITT),
1429          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1430          * Either way, make sure we allocate an struct iscsi_cmd, as both
1431          * can contain ping data.
1432          */
1433         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1434                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1435                 if (!cmd)
1436                         return iscsit_add_reject(
1437                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1438                                         1, buf, conn);
1439
1440                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1441                 cmd->i_state            = ISTATE_SEND_NOPIN;
1442                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1443                                                 1 : 0);
1444                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1445                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1446                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1447                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1448                 cmd->data_direction     = DMA_NONE;
1449         }
1450
1451         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1452                 rx_size = payload_length;
1453                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1454                 if (!ping_data) {
1455                         pr_err("Unable to allocate memory for"
1456                                 " NOPOUT ping data.\n");
1457                         ret = -1;
1458                         goto out;
1459                 }
1460
1461                 iov = &cmd->iov_misc[0];
1462                 iov[niov].iov_base      = ping_data;
1463                 iov[niov++].iov_len     = payload_length;
1464
1465                 padding = ((-payload_length) & 3);
1466                 if (padding != 0) {
1467                         pr_debug("Receiving %u additional bytes"
1468                                 " for padding.\n", padding);
1469                         iov[niov].iov_base      = &cmd->pad_bytes;
1470                         iov[niov++].iov_len     = padding;
1471                         rx_size += padding;
1472                 }
1473                 if (conn->conn_ops->DataDigest) {
1474                         iov[niov].iov_base      = &checksum;
1475                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1476                         rx_size += ISCSI_CRC_LEN;
1477                 }
1478
1479                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1480                 if (rx_got != rx_size) {
1481                         ret = -1;
1482                         goto out;
1483                 }
1484
1485                 if (conn->conn_ops->DataDigest) {
1486                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1487                                         ping_data, payload_length,
1488                                         padding, cmd->pad_bytes,
1489                                         (u8 *)&data_crc);
1490
1491                         if (checksum != data_crc) {
1492                                 pr_err("Ping data CRC32C DataDigest"
1493                                 " 0x%08x does not match computed 0x%08x\n",
1494                                         checksum, data_crc);
1495                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1496                                         pr_err("Unable to recover from"
1497                                         " NOPOUT Ping DataCRC failure while in"
1498                                                 " ERL=0.\n");
1499                                         ret = -1;
1500                                         goto out;
1501                                 } else {
1502                                         /*
1503                                          * Silently drop this PDU and let the
1504                                          * initiator plug the CmdSN gap.
1505                                          */
1506                                         pr_debug("Dropping NOPOUT"
1507                                         " Command CmdSN: 0x%08x due to"
1508                                         " DataCRC error.\n", hdr->cmdsn);
1509                                         ret = 0;
1510                                         goto out;
1511                                 }
1512                         } else {
1513                                 pr_debug("Got CRC32C DataDigest"
1514                                 " 0x%08x for %u bytes of ping data.\n",
1515                                         checksum, payload_length);
1516                         }
1517                 }
1518
1519                 ping_data[payload_length] = '\0';
1520                 /*
1521                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1522                  */
1523                 cmd->buf_ptr = ping_data;
1524                 cmd->buf_ptr_size = payload_length;
1525
1526                 pr_debug("Got %u bytes of NOPOUT ping"
1527                         " data.\n", payload_length);
1528                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1529         }
1530
1531         if (hdr->itt != RESERVED_ITT) {
1532                 if (!cmd) {
1533                         pr_err("Checking CmdSN for NOPOUT,"
1534                                 " but cmd is NULL!\n");
1535                         return -1;
1536                 }
1537                 /*
1538                  * Initiator is expecting a NopIN ping reply,
1539                  */
1540                 spin_lock_bh(&conn->cmd_lock);
1541                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1542                 spin_unlock_bh(&conn->cmd_lock);
1543
1544                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1545
1546                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1547                         iscsit_add_cmd_to_response_queue(cmd, conn,
1548                                         cmd->i_state);
1549                         return 0;
1550                 }
1551
1552                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1553                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1554                         ret = 0;
1555                         goto ping_out;
1556                 }
1557                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1558                         return iscsit_add_reject_from_cmd(
1559                                         ISCSI_REASON_PROTOCOL_ERROR,
1560                                         1, 0, buf, cmd);
1561
1562                 return 0;
1563         }
1564
1565         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1566                 /*
1567                  * This was a response to a unsolicited NOPIN ping.
1568                  */
1569                 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1570                 if (!cmd)
1571                         return -1;
1572
1573                 iscsit_stop_nopin_response_timer(conn);
1574
1575                 cmd->i_state = ISTATE_REMOVE;
1576                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1577                 iscsit_start_nopin_timer(conn);
1578         } else {
1579                 /*
1580                  * Initiator is not expecting a NOPIN is response.
1581                  * Just ignore for now.
1582                  *
1583                  * iSCSI v19-91 10.18
1584                  * "A NOP-OUT may also be used to confirm a changed
1585                  *  ExpStatSN if another PDU will not be available
1586                  *  for a long time."
1587                  */
1588                 ret = 0;
1589                 goto out;
1590         }
1591
1592         return 0;
1593 out:
1594         if (cmd)
1595                 iscsit_release_cmd(cmd);
1596 ping_out:
1597         kfree(ping_data);
1598         return ret;
1599 }
1600
1601 static int iscsit_handle_task_mgt_cmd(
1602         struct iscsi_conn *conn,
1603         unsigned char *buf)
1604 {
1605         struct iscsi_cmd *cmd;
1606         struct se_tmr_req *se_tmr;
1607         struct iscsi_tmr_req *tmr_req;
1608         struct iscsi_tm *hdr;
1609         int out_of_order_cmdsn = 0;
1610         int ret;
1611         u8 function;
1612
1613         hdr                     = (struct iscsi_tm *) buf;
1614         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1615         function = hdr->flags;
1616
1617         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1618                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1619                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1620                 hdr->rtt, hdr->refcmdsn, conn->cid);
1621
1622         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1623             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1624              hdr->rtt != RESERVED_ITT)) {
1625                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1626                 hdr->rtt = RESERVED_ITT;
1627         }
1628
1629         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1630                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1631                 pr_err("Task Management Request TASK_REASSIGN not"
1632                         " issued as immediate command, bad iSCSI Initiator"
1633                                 "implementation\n");
1634                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1635                                         buf, conn);
1636         }
1637         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1638             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1639                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1640
1641         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1642         if (!cmd)
1643                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1644                                          1, buf, conn);
1645
1646         cmd->data_direction = DMA_NONE;
1647
1648         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1649         if (!cmd->tmr_req) {
1650                 pr_err("Unable to allocate memory for"
1651                         " Task Management command!\n");
1652                 return iscsit_add_reject_from_cmd(
1653                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1654                         1, 1, buf, cmd);
1655         }
1656
1657         /*
1658          * TASK_REASSIGN for ERL=2 / connection stays inside of
1659          * LIO-Target $FABRIC_MOD
1660          */
1661         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1662
1663                 u8 tcm_function;
1664                 int ret;
1665
1666                 transport_init_se_cmd(&cmd->se_cmd,
1667                                       &lio_target_fabric_configfs->tf_ops,
1668                                       conn->sess->se_sess, 0, DMA_NONE,
1669                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1670
1671                 switch (function) {
1672                 case ISCSI_TM_FUNC_ABORT_TASK:
1673                         tcm_function = TMR_ABORT_TASK;
1674                         break;
1675                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1676                         tcm_function = TMR_ABORT_TASK_SET;
1677                         break;
1678                 case ISCSI_TM_FUNC_CLEAR_ACA:
1679                         tcm_function = TMR_CLEAR_ACA;
1680                         break;
1681                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1682                         tcm_function = TMR_CLEAR_TASK_SET;
1683                         break;
1684                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1685                         tcm_function = TMR_LUN_RESET;
1686                         break;
1687                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1688                         tcm_function = TMR_TARGET_WARM_RESET;
1689                         break;
1690                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1691                         tcm_function = TMR_TARGET_COLD_RESET;
1692                         break;
1693                 default:
1694                         pr_err("Unknown iSCSI TMR Function:"
1695                                " 0x%02x\n", function);
1696                         return iscsit_add_reject_from_cmd(
1697                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1698                                 1, 1, buf, cmd);
1699                 }
1700
1701                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1702                                          tcm_function, GFP_KERNEL);
1703                 if (ret < 0)
1704                         return iscsit_add_reject_from_cmd(
1705                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1706                                 1, 1, buf, cmd);
1707
1708                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1709         }
1710
1711         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1712         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1713         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1714         cmd->init_task_tag      = hdr->itt;
1715         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1716         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1717         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1718         se_tmr                  = cmd->se_cmd.se_tmr_req;
1719         tmr_req                 = cmd->tmr_req;
1720         /*
1721          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1722          */
1723         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1724                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1725                                                scsilun_to_int(&hdr->lun));
1726                 if (ret < 0) {
1727                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1728                         goto attach;
1729                 }
1730         }
1731
1732         switch (function) {
1733         case ISCSI_TM_FUNC_ABORT_TASK:
1734                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1735                 if (se_tmr->response)
1736                         goto attach;
1737                 break;
1738         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1739         case ISCSI_TM_FUNC_CLEAR_ACA:
1740         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1741         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1742                 break;
1743         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1744                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1745                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1746                         goto attach;
1747                 }
1748                 break;
1749         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1750                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1751                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1752                         goto attach;
1753                 }
1754                 break;
1755         case ISCSI_TM_FUNC_TASK_REASSIGN:
1756                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1757                 /*
1758                  * Perform sanity checks on the ExpDataSN only if the
1759                  * TASK_REASSIGN was successful.
1760                  */
1761                 if (se_tmr->response)
1762                         break;
1763
1764                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1765                         return iscsit_add_reject_from_cmd(
1766                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1767                                         buf, cmd);
1768                 break;
1769         default:
1770                 pr_err("Unknown TMR function: 0x%02x, protocol"
1771                         " error.\n", function);
1772                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1773                 goto attach;
1774         }
1775
1776         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1777             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1778                 se_tmr->call_transport = 1;
1779 attach:
1780         spin_lock_bh(&conn->cmd_lock);
1781         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1782         spin_unlock_bh(&conn->cmd_lock);
1783
1784         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1785                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1786                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1787                         out_of_order_cmdsn = 1;
1788                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1789                         return 0;
1790                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1791                         return iscsit_add_reject_from_cmd(
1792                                         ISCSI_REASON_PROTOCOL_ERROR,
1793                                         1, 0, buf, cmd);
1794         }
1795         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1796
1797         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1798                 return 0;
1799         /*
1800          * Found the referenced task, send to transport for processing.
1801          */
1802         if (se_tmr->call_transport)
1803                 return transport_generic_handle_tmr(&cmd->se_cmd);
1804
1805         /*
1806          * Could not find the referenced LUN, task, or Task Management
1807          * command not authorized or supported.  Change state and
1808          * let the tx_thread send the response.
1809          *
1810          * For connection recovery, this is also the default action for
1811          * TMR TASK_REASSIGN.
1812          */
1813         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1814         return 0;
1815 }
1816
1817 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1818 static int iscsit_handle_text_cmd(
1819         struct iscsi_conn *conn,
1820         unsigned char *buf)
1821 {
1822         char *text_ptr, *text_in;
1823         int cmdsn_ret, niov = 0, rx_got, rx_size;
1824         u32 checksum = 0, data_crc = 0, payload_length;
1825         u32 padding = 0, pad_bytes = 0, text_length = 0;
1826         struct iscsi_cmd *cmd;
1827         struct kvec iov[3];
1828         struct iscsi_text *hdr;
1829
1830         hdr                     = (struct iscsi_text *) buf;
1831         payload_length          = ntoh24(hdr->dlength);
1832
1833         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1834                 pr_err("Unable to accept text parameter length: %u"
1835                         "greater than MaxXmitDataSegmentLength %u.\n",
1836                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1837                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1838                                         buf, conn);
1839         }
1840
1841         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1842                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1843                 hdr->exp_statsn, payload_length);
1844
1845         rx_size = text_length = payload_length;
1846         if (text_length) {
1847                 text_in = kzalloc(text_length, GFP_KERNEL);
1848                 if (!text_in) {
1849                         pr_err("Unable to allocate memory for"
1850                                 " incoming text parameters\n");
1851                         return -1;
1852                 }
1853
1854                 memset(iov, 0, 3 * sizeof(struct kvec));
1855                 iov[niov].iov_base      = text_in;
1856                 iov[niov++].iov_len     = text_length;
1857
1858                 padding = ((-payload_length) & 3);
1859                 if (padding != 0) {
1860                         iov[niov].iov_base = &pad_bytes;
1861                         iov[niov++].iov_len  = padding;
1862                         rx_size += padding;
1863                         pr_debug("Receiving %u additional bytes"
1864                                         " for padding.\n", padding);
1865                 }
1866                 if (conn->conn_ops->DataDigest) {
1867                         iov[niov].iov_base      = &checksum;
1868                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1869                         rx_size += ISCSI_CRC_LEN;
1870                 }
1871
1872                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1873                 if (rx_got != rx_size) {
1874                         kfree(text_in);
1875                         return -1;
1876                 }
1877
1878                 if (conn->conn_ops->DataDigest) {
1879                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1880                                         text_in, text_length,
1881                                         padding, (u8 *)&pad_bytes,
1882                                         (u8 *)&data_crc);
1883
1884                         if (checksum != data_crc) {
1885                                 pr_err("Text data CRC32C DataDigest"
1886                                         " 0x%08x does not match computed"
1887                                         " 0x%08x\n", checksum, data_crc);
1888                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1889                                         pr_err("Unable to recover from"
1890                                         " Text Data digest failure while in"
1891                                                 " ERL=0.\n");
1892                                         kfree(text_in);
1893                                         return -1;
1894                                 } else {
1895                                         /*
1896                                          * Silently drop this PDU and let the
1897                                          * initiator plug the CmdSN gap.
1898                                          */
1899                                         pr_debug("Dropping Text"
1900                                         " Command CmdSN: 0x%08x due to"
1901                                         " DataCRC error.\n", hdr->cmdsn);
1902                                         kfree(text_in);
1903                                         return 0;
1904                                 }
1905                         } else {
1906                                 pr_debug("Got CRC32C DataDigest"
1907                                         " 0x%08x for %u bytes of text data.\n",
1908                                                 checksum, text_length);
1909                         }
1910                 }
1911                 text_in[text_length - 1] = '\0';
1912                 pr_debug("Successfully read %d bytes of text"
1913                                 " data.\n", text_length);
1914
1915                 if (strncmp("SendTargets", text_in, 11) != 0) {
1916                         pr_err("Received Text Data that is not"
1917                                 " SendTargets, cannot continue.\n");
1918                         kfree(text_in);
1919                         return -1;
1920                 }
1921                 text_ptr = strchr(text_in, '=');
1922                 if (!text_ptr) {
1923                         pr_err("No \"=\" separator found in Text Data,"
1924                                 "  cannot continue.\n");
1925                         kfree(text_in);
1926                         return -1;
1927                 }
1928                 if (strncmp("=All", text_ptr, 4) != 0) {
1929                         pr_err("Unable to locate All value for"
1930                                 " SendTargets key,  cannot continue.\n");
1931                         kfree(text_in);
1932                         return -1;
1933                 }
1934 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1935                 kfree(text_in);
1936         }
1937
1938         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1939         if (!cmd)
1940                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1941                                         1, buf, conn);
1942
1943         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1944         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1945         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1946         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1947         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1948         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1949         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1950         cmd->data_direction     = DMA_NONE;
1951
1952         spin_lock_bh(&conn->cmd_lock);
1953         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1954         spin_unlock_bh(&conn->cmd_lock);
1955
1956         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1957
1958         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1959                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1960                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1961                         return iscsit_add_reject_from_cmd(
1962                                         ISCSI_REASON_PROTOCOL_ERROR,
1963                                         1, 0, buf, cmd);
1964
1965                 return 0;
1966         }
1967
1968         return iscsit_execute_cmd(cmd, 0);
1969 }
1970
1971 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1972 {
1973         struct iscsi_conn *conn_p;
1974         struct iscsi_session *sess = conn->sess;
1975
1976         pr_debug("Received logout request CLOSESESSION on CID: %hu"
1977                 " for SID: %u.\n", conn->cid, conn->sess->sid);
1978
1979         atomic_set(&sess->session_logout, 1);
1980         atomic_set(&conn->conn_logout_remove, 1);
1981         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
1982
1983         iscsit_inc_conn_usage_count(conn);
1984         iscsit_inc_session_usage_count(sess);
1985
1986         spin_lock_bh(&sess->conn_lock);
1987         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
1988                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
1989                         continue;
1990
1991                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
1992                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
1993         }
1994         spin_unlock_bh(&sess->conn_lock);
1995
1996         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1997
1998         return 0;
1999 }
2000
2001 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2002 {
2003         struct iscsi_conn *l_conn;
2004         struct iscsi_session *sess = conn->sess;
2005
2006         pr_debug("Received logout request CLOSECONNECTION for CID:"
2007                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2008
2009         /*
2010          * A Logout Request with a CLOSECONNECTION reason code for a CID
2011          * can arrive on a connection with a differing CID.
2012          */
2013         if (conn->cid == cmd->logout_cid) {
2014                 spin_lock_bh(&conn->state_lock);
2015                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2016                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2017
2018                 atomic_set(&conn->conn_logout_remove, 1);
2019                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2020                 iscsit_inc_conn_usage_count(conn);
2021
2022                 spin_unlock_bh(&conn->state_lock);
2023         } else {
2024                 /*
2025                  * Handle all different cid CLOSECONNECTION requests in
2026                  * iscsit_logout_post_handler_diffcid() as to give enough
2027                  * time for any non immediate command's CmdSN to be
2028                  * acknowledged on the connection in question.
2029                  *
2030                  * Here we simply make sure the CID is still around.
2031                  */
2032                 l_conn = iscsit_get_conn_from_cid(sess,
2033                                 cmd->logout_cid);
2034                 if (!l_conn) {
2035                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2036                         iscsit_add_cmd_to_response_queue(cmd, conn,
2037                                         cmd->i_state);
2038                         return 0;
2039                 }
2040
2041                 iscsit_dec_conn_usage_count(l_conn);
2042         }
2043
2044         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2045
2046         return 0;
2047 }
2048
2049 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2050 {
2051         struct iscsi_session *sess = conn->sess;
2052
2053         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2054                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2055
2056         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2057                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2058                         " while ERL!=2.\n");
2059                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2060                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2061                 return 0;
2062         }
2063
2064         if (conn->cid == cmd->logout_cid) {
2065                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2066                         " with CID: %hu on CID: %hu, implementation error.\n",
2067                                 cmd->logout_cid, conn->cid);
2068                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2069                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2070                 return 0;
2071         }
2072
2073         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2074
2075         return 0;
2076 }
2077
2078 static int iscsit_handle_logout_cmd(
2079         struct iscsi_conn *conn,
2080         unsigned char *buf)
2081 {
2082         int cmdsn_ret, logout_remove = 0;
2083         u8 reason_code = 0;
2084         struct iscsi_cmd *cmd;
2085         struct iscsi_logout *hdr;
2086         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2087
2088         hdr                     = (struct iscsi_logout *) buf;
2089         reason_code             = (hdr->flags & 0x7f);
2090
2091         if (tiqn) {
2092                 spin_lock(&tiqn->logout_stats.lock);
2093                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2094                         tiqn->logout_stats.normal_logouts++;
2095                 else
2096                         tiqn->logout_stats.abnormal_logouts++;
2097                 spin_unlock(&tiqn->logout_stats.lock);
2098         }
2099
2100         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2101                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2102                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2103                 hdr->cid, conn->cid);
2104
2105         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2106                 pr_err("Received logout request on connection that"
2107                         " is not in logged in state, ignoring request.\n");
2108                 return 0;
2109         }
2110
2111         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2112         if (!cmd)
2113                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2114                                         buf, conn);
2115
2116         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2117         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2118         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2119         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2120         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2121         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2122         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2123         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2124         cmd->logout_reason      = reason_code;
2125         cmd->data_direction     = DMA_NONE;
2126
2127         /*
2128          * We need to sleep in these cases (by returning 1) until the Logout
2129          * Response gets sent in the tx thread.
2130          */
2131         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2132            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2133             be16_to_cpu(hdr->cid) == conn->cid))
2134                 logout_remove = 1;
2135
2136         spin_lock_bh(&conn->cmd_lock);
2137         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2138         spin_unlock_bh(&conn->cmd_lock);
2139
2140         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2141                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2142
2143         /*
2144          * Immediate commands are executed, well, immediately.
2145          * Non-Immediate Logout Commands are executed in CmdSN order.
2146          */
2147         if (cmd->immediate_cmd) {
2148                 int ret = iscsit_execute_cmd(cmd, 0);
2149
2150                 if (ret < 0)
2151                         return ret;
2152         } else {
2153                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2154                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2155                         logout_remove = 0;
2156                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2157                         return iscsit_add_reject_from_cmd(
2158                                 ISCSI_REASON_PROTOCOL_ERROR,
2159                                 1, 0, buf, cmd);
2160                 }
2161         }
2162
2163         return logout_remove;
2164 }
2165
2166 static int iscsit_handle_snack(
2167         struct iscsi_conn *conn,
2168         unsigned char *buf)
2169 {
2170         struct iscsi_snack *hdr;
2171
2172         hdr                     = (struct iscsi_snack *) buf;
2173         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2174
2175         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2176                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2177                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2178                         hdr->begrun, hdr->runlength, conn->cid);
2179
2180         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2181                 pr_err("Initiator sent SNACK request while in"
2182                         " ErrorRecoveryLevel=0.\n");
2183                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2184                                         buf, conn);
2185         }
2186         /*
2187          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2188          * call from inside iscsi_send_recovery_datain_or_r2t().
2189          */
2190         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2191         case 0:
2192                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2193                         hdr->itt,
2194                         be32_to_cpu(hdr->ttt),
2195                         be32_to_cpu(hdr->begrun),
2196                         be32_to_cpu(hdr->runlength));
2197         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2198                 return iscsit_handle_status_snack(conn, hdr->itt,
2199                         be32_to_cpu(hdr->ttt),
2200                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2201         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2202                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2203                         be32_to_cpu(hdr->begrun),
2204                         be32_to_cpu(hdr->runlength));
2205         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2206                 /* FIXME: Support R-Data SNACK */
2207                 pr_err("R-Data SNACK Not Supported.\n");
2208                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2209                                         buf, conn);
2210         default:
2211                 pr_err("Unknown SNACK type 0x%02x, protocol"
2212                         " error.\n", hdr->flags & 0x0f);
2213                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2214                                         buf, conn);
2215         }
2216
2217         return 0;
2218 }
2219
2220 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2221 {
2222         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2223             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2224                 wait_for_completion_interruptible_timeout(
2225                                         &conn->rx_half_close_comp,
2226                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2227         }
2228 }
2229
2230 static int iscsit_handle_immediate_data(
2231         struct iscsi_cmd *cmd,
2232         unsigned char *buf,
2233         u32 length)
2234 {
2235         int iov_ret, rx_got = 0, rx_size = 0;
2236         u32 checksum, iov_count = 0, padding = 0;
2237         struct iscsi_conn *conn = cmd->conn;
2238         struct kvec *iov;
2239
2240         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2241         if (iov_ret < 0)
2242                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2243
2244         rx_size = length;
2245         iov_count = iov_ret;
2246         iov = &cmd->iov_data[0];
2247
2248         padding = ((-length) & 3);
2249         if (padding != 0) {
2250                 iov[iov_count].iov_base = cmd->pad_bytes;
2251                 iov[iov_count++].iov_len = padding;
2252                 rx_size += padding;
2253         }
2254
2255         if (conn->conn_ops->DataDigest) {
2256                 iov[iov_count].iov_base         = &checksum;
2257                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2258                 rx_size += ISCSI_CRC_LEN;
2259         }
2260
2261         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2262
2263         iscsit_unmap_iovec(cmd);
2264
2265         if (rx_got != rx_size) {
2266                 iscsit_rx_thread_wait_for_tcp(conn);
2267                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2268         }
2269
2270         if (conn->conn_ops->DataDigest) {
2271                 u32 data_crc;
2272
2273                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2274                                                     cmd->write_data_done, length, padding,
2275                                                     cmd->pad_bytes);
2276
2277                 if (checksum != data_crc) {
2278                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2279                                 " does not match computed 0x%08x\n", checksum,
2280                                 data_crc);
2281
2282                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2283                                 pr_err("Unable to recover from"
2284                                         " Immediate Data digest failure while"
2285                                         " in ERL=0.\n");
2286                                 iscsit_add_reject_from_cmd(
2287                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2288                                                 1, 0, buf, cmd);
2289                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2290                         } else {
2291                                 iscsit_add_reject_from_cmd(
2292                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2293                                                 0, 0, buf, cmd);
2294                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2295                         }
2296                 } else {
2297                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2298                                 " %u bytes of Immediate Data\n", checksum,
2299                                 length);
2300                 }
2301         }
2302
2303         cmd->write_data_done += length;
2304
2305         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2306                 spin_lock_bh(&cmd->istate_lock);
2307                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2308                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2309                 spin_unlock_bh(&cmd->istate_lock);
2310         }
2311
2312         return IMMEDIATE_DATA_NORMAL_OPERATION;
2313 }
2314
2315 /*
2316  *      Called with sess->conn_lock held.
2317  */
2318 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2319         with active network interface */
2320 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2321 {
2322         struct iscsi_cmd *cmd;
2323         struct iscsi_conn *conn_p;
2324
2325         /*
2326          * Only send a Asynchronous Message on connections whos network
2327          * interface is still functional.
2328          */
2329         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2330                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2331                         iscsit_inc_conn_usage_count(conn_p);
2332                         break;
2333                 }
2334         }
2335
2336         if (!conn_p)
2337                 return;
2338
2339         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2340         if (!cmd) {
2341                 iscsit_dec_conn_usage_count(conn_p);
2342                 return;
2343         }
2344
2345         cmd->logout_cid = conn->cid;
2346         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2347         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2348
2349         spin_lock_bh(&conn_p->cmd_lock);
2350         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2351         spin_unlock_bh(&conn_p->cmd_lock);
2352
2353         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2354         iscsit_dec_conn_usage_count(conn_p);
2355 }
2356
2357 static int iscsit_send_conn_drop_async_message(
2358         struct iscsi_cmd *cmd,
2359         struct iscsi_conn *conn)
2360 {
2361         struct iscsi_async *hdr;
2362
2363         cmd->tx_size = ISCSI_HDR_LEN;
2364         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2365
2366         hdr                     = (struct iscsi_async *) cmd->pdu;
2367         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2368         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2369         cmd->init_task_tag      = RESERVED_ITT;
2370         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2371         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2372         cmd->stat_sn            = conn->stat_sn++;
2373         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2374         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2375         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2376         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2377         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2378         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2379         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2380
2381         if (conn->conn_ops->HeaderDigest) {
2382                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2383
2384                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2385                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2386                                 0, NULL, (u8 *)header_digest);
2387
2388                 cmd->tx_size += ISCSI_CRC_LEN;
2389                 pr_debug("Attaching CRC32C HeaderDigest to"
2390                         " Async Message 0x%08x\n", *header_digest);
2391         }
2392
2393         cmd->iov_misc[0].iov_base       = cmd->pdu;
2394         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2395         cmd->iov_misc_count             = 1;
2396
2397         pr_debug("Sending Connection Dropped Async Message StatSN:"
2398                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2399                         cmd->logout_cid, conn->cid);
2400         return 0;
2401 }
2402
2403 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2404 {
2405         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2406             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2407                 wait_for_completion_interruptible_timeout(
2408                                         &conn->tx_half_close_comp,
2409                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2410         }
2411 }
2412
2413 static int iscsit_send_data_in(
2414         struct iscsi_cmd *cmd,
2415         struct iscsi_conn *conn)
2416 {
2417         int iov_ret = 0, set_statsn = 0;
2418         u32 iov_count = 0, tx_size = 0;
2419         struct iscsi_datain datain;
2420         struct iscsi_datain_req *dr;
2421         struct iscsi_data_rsp *hdr;
2422         struct kvec *iov;
2423         int eodr = 0;
2424         int ret;
2425
2426         memset(&datain, 0, sizeof(struct iscsi_datain));
2427         dr = iscsit_get_datain_values(cmd, &datain);
2428         if (!dr) {
2429                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2430                                 cmd->init_task_tag);
2431                 return -1;
2432         }
2433
2434         /*
2435          * Be paranoid and double check the logic for now.
2436          */
2437         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2438                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2439                         " datain.length: %u exceeds cmd->data_length: %u\n",
2440                         cmd->init_task_tag, datain.offset, datain.length,
2441                                 cmd->se_cmd.data_length);
2442                 return -1;
2443         }
2444
2445         spin_lock_bh(&conn->sess->session_stats_lock);
2446         conn->sess->tx_data_octets += datain.length;
2447         if (conn->sess->se_sess->se_node_acl) {
2448                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2449                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2450                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2451         }
2452         spin_unlock_bh(&conn->sess->session_stats_lock);
2453         /*
2454          * Special case for successfully execution w/ both DATAIN
2455          * and Sense Data.
2456          */
2457         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2458             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2459                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2460         else {
2461                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2462                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2463                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2464                         cmd->stat_sn = conn->stat_sn++;
2465                         set_statsn = 1;
2466                 } else if (dr->dr_complete ==
2467                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2468                         set_statsn = 1;
2469         }
2470
2471         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2472         memset(hdr, 0, ISCSI_HDR_LEN);
2473         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2474         hdr->flags              = datain.flags;
2475         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2476                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2477                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2478                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2479                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2480                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2481                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2482                 }
2483         }
2484         hton24(hdr->dlength, datain.length);
2485         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2486                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2487                                 (struct scsi_lun *)&hdr->lun);
2488         else
2489                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2490
2491         hdr->itt                = cmd->init_task_tag;
2492
2493         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2494                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2495         else
2496                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2497         if (set_statsn)
2498                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2499         else
2500                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2501
2502         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2503         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2504         hdr->datasn             = cpu_to_be32(datain.data_sn);
2505         hdr->offset             = cpu_to_be32(datain.offset);
2506
2507         iov = &cmd->iov_data[0];
2508         iov[iov_count].iov_base = cmd->pdu;
2509         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2510         tx_size += ISCSI_HDR_LEN;
2511
2512         if (conn->conn_ops->HeaderDigest) {
2513                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2514
2515                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2516                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2517                                 0, NULL, (u8 *)header_digest);
2518
2519                 iov[0].iov_len += ISCSI_CRC_LEN;
2520                 tx_size += ISCSI_CRC_LEN;
2521
2522                 pr_debug("Attaching CRC32 HeaderDigest"
2523                         " for DataIN PDU 0x%08x\n", *header_digest);
2524         }
2525
2526         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2527         if (iov_ret < 0)
2528                 return -1;
2529
2530         iov_count += iov_ret;
2531         tx_size += datain.length;
2532
2533         cmd->padding = ((-datain.length) & 3);
2534         if (cmd->padding) {
2535                 iov[iov_count].iov_base         = cmd->pad_bytes;
2536                 iov[iov_count++].iov_len        = cmd->padding;
2537                 tx_size += cmd->padding;
2538
2539                 pr_debug("Attaching %u padding bytes\n",
2540                                 cmd->padding);
2541         }
2542         if (conn->conn_ops->DataDigest) {
2543                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2544                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2545
2546                 iov[iov_count].iov_base = &cmd->data_crc;
2547                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2548                 tx_size += ISCSI_CRC_LEN;
2549
2550                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2551                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2552         }
2553
2554         cmd->iov_data_count = iov_count;
2555         cmd->tx_size = tx_size;
2556
2557         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2558                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2559                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2560                 ntohl(hdr->offset), datain.length, conn->cid);
2561
2562         /* sendpage is preferred but can't insert markers */
2563         if (!conn->conn_ops->IFMarker)
2564                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2565         else
2566                 ret = iscsit_send_tx_data(cmd, conn, 0);
2567
2568         iscsit_unmap_iovec(cmd);
2569
2570         if (ret < 0) {
2571                 iscsit_tx_thread_wait_for_tcp(conn);
2572                 return ret;
2573         }
2574
2575         if (dr->dr_complete) {
2576                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2577                                 2 : 1;
2578                 iscsit_free_datain_req(cmd, dr);
2579         }
2580
2581         return eodr;
2582 }
2583
2584 static int iscsit_send_logout_response(
2585         struct iscsi_cmd *cmd,
2586         struct iscsi_conn *conn)
2587 {
2588         int niov = 0, tx_size;
2589         struct iscsi_conn *logout_conn = NULL;
2590         struct iscsi_conn_recovery *cr = NULL;
2591         struct iscsi_session *sess = conn->sess;
2592         struct kvec *iov;
2593         struct iscsi_logout_rsp *hdr;
2594         /*
2595          * The actual shutting down of Sessions and/or Connections
2596          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2597          * is done in scsi_logout_post_handler().
2598          */
2599         switch (cmd->logout_reason) {
2600         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2601                 pr_debug("iSCSI session logout successful, setting"
2602                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2603                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2604                 break;
2605         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2606                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2607                         break;
2608                 /*
2609                  * For CLOSECONNECTION logout requests carrying
2610                  * a matching logout CID -> local CID, the reference
2611                  * for the local CID will have been incremented in
2612                  * iscsi_logout_closeconnection().
2613                  *
2614                  * For CLOSECONNECTION logout requests carrying
2615                  * a different CID than the connection it arrived
2616                  * on, the connection responding to cmd->logout_cid
2617                  * is stopped in iscsit_logout_post_handler_diffcid().
2618                  */
2619
2620                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2621                         " successful.\n", cmd->logout_cid, conn->cid);
2622                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2623                 break;
2624         case ISCSI_LOGOUT_REASON_RECOVERY:
2625                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2626                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2627                         break;
2628                 /*
2629                  * If the connection is still active from our point of view
2630                  * force connection recovery to occur.
2631                  */
2632                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2633                                 cmd->logout_cid);
2634                 if (logout_conn) {
2635                         iscsit_connection_reinstatement_rcfr(logout_conn);
2636                         iscsit_dec_conn_usage_count(logout_conn);
2637                 }
2638
2639                 cr = iscsit_get_inactive_connection_recovery_entry(
2640                                 conn->sess, cmd->logout_cid);
2641                 if (!cr) {
2642                         pr_err("Unable to locate CID: %hu for"
2643                         " REMOVECONNFORRECOVERY Logout Request.\n",
2644                                 cmd->logout_cid);
2645                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2646                         break;
2647                 }
2648
2649                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2650
2651                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2652                         " for recovery for CID: %hu on CID: %hu successful.\n",
2653                                 cmd->logout_cid, conn->cid);
2654                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2655                 break;
2656         default:
2657                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2658                                 cmd->logout_reason);
2659                 return -1;
2660         }
2661
2662         tx_size = ISCSI_HDR_LEN;
2663         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2664         memset(hdr, 0, ISCSI_HDR_LEN);
2665         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2666         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2667         hdr->response           = cmd->logout_response;
2668         hdr->itt                = cmd->init_task_tag;
2669         cmd->stat_sn            = conn->stat_sn++;
2670         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2671
2672         iscsit_increment_maxcmdsn(cmd, conn->sess);
2673         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2674         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2675
2676         iov = &cmd->iov_misc[0];
2677         iov[niov].iov_base      = cmd->pdu;
2678         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2679
2680         if (conn->conn_ops->HeaderDigest) {
2681                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2682
2683                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2684                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2685                                 0, NULL, (u8 *)header_digest);
2686
2687                 iov[0].iov_len += ISCSI_CRC_LEN;
2688                 tx_size += ISCSI_CRC_LEN;
2689                 pr_debug("Attaching CRC32C HeaderDigest to"
2690                         " Logout Response 0x%08x\n", *header_digest);
2691         }
2692         cmd->iov_misc_count = niov;
2693         cmd->tx_size = tx_size;
2694
2695         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2696                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2697                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2698                 cmd->logout_cid, conn->cid);
2699
2700         return 0;
2701 }
2702
2703 /*
2704  *      Unsolicited NOPIN, either requesting a response or not.
2705  */
2706 static int iscsit_send_unsolicited_nopin(
2707         struct iscsi_cmd *cmd,
2708         struct iscsi_conn *conn,
2709         int want_response)
2710 {
2711         int tx_size = ISCSI_HDR_LEN;
2712         struct iscsi_nopin *hdr;
2713         int ret;
2714
2715         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2716         memset(hdr, 0, ISCSI_HDR_LEN);
2717         hdr->opcode             = ISCSI_OP_NOOP_IN;
2718         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2719         hdr->itt                = cmd->init_task_tag;
2720         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2721         cmd->stat_sn            = conn->stat_sn;
2722         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2723         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2724         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2725
2726         if (conn->conn_ops->HeaderDigest) {
2727                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2728
2729                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2730                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2731                                 0, NULL, (u8 *)header_digest);
2732
2733                 tx_size += ISCSI_CRC_LEN;
2734                 pr_debug("Attaching CRC32C HeaderDigest to"
2735                         " NopIN 0x%08x\n", *header_digest);
2736         }
2737
2738         cmd->iov_misc[0].iov_base       = cmd->pdu;
2739         cmd->iov_misc[0].iov_len        = tx_size;
2740         cmd->iov_misc_count     = 1;
2741         cmd->tx_size            = tx_size;
2742
2743         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2744                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2745
2746         ret = iscsit_send_tx_data(cmd, conn, 1);
2747         if (ret < 0) {
2748                 iscsit_tx_thread_wait_for_tcp(conn);
2749                 return ret;
2750         }
2751
2752         spin_lock_bh(&cmd->istate_lock);
2753         cmd->i_state = want_response ?
2754                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2755         spin_unlock_bh(&cmd->istate_lock);
2756
2757         return 0;
2758 }
2759
2760 static int iscsit_send_nopin_response(
2761         struct iscsi_cmd *cmd,
2762         struct iscsi_conn *conn)
2763 {
2764         int niov = 0, tx_size;
2765         u32 padding = 0;
2766         struct kvec *iov;
2767         struct iscsi_nopin *hdr;
2768
2769         tx_size = ISCSI_HDR_LEN;
2770         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2771         memset(hdr, 0, ISCSI_HDR_LEN);
2772         hdr->opcode             = ISCSI_OP_NOOP_IN;
2773         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2774         hton24(hdr->dlength, cmd->buf_ptr_size);
2775         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2776         hdr->itt                = cmd->init_task_tag;
2777         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2778         cmd->stat_sn            = conn->stat_sn++;
2779         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2780
2781         iscsit_increment_maxcmdsn(cmd, conn->sess);
2782         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2783         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2784
2785         iov = &cmd->iov_misc[0];
2786         iov[niov].iov_base      = cmd->pdu;
2787         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2788
2789         if (conn->conn_ops->HeaderDigest) {
2790                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2791
2792                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2793                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2794                                 0, NULL, (u8 *)header_digest);
2795
2796                 iov[0].iov_len += ISCSI_CRC_LEN;
2797                 tx_size += ISCSI_CRC_LEN;
2798                 pr_debug("Attaching CRC32C HeaderDigest"
2799                         " to NopIn 0x%08x\n", *header_digest);
2800         }
2801
2802         /*
2803          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2804          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2805          */
2806         if (cmd->buf_ptr_size) {
2807                 iov[niov].iov_base      = cmd->buf_ptr;
2808                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2809                 tx_size += cmd->buf_ptr_size;
2810
2811                 pr_debug("Echoing back %u bytes of ping"
2812                         " data.\n", cmd->buf_ptr_size);
2813
2814                 padding = ((-cmd->buf_ptr_size) & 3);
2815                 if (padding != 0) {
2816                         iov[niov].iov_base = &cmd->pad_bytes;
2817                         iov[niov++].iov_len = padding;
2818                         tx_size += padding;
2819                         pr_debug("Attaching %u additional"
2820                                 " padding bytes.\n", padding);
2821                 }
2822                 if (conn->conn_ops->DataDigest) {
2823                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2824                                 cmd->buf_ptr, cmd->buf_ptr_size,
2825                                 padding, (u8 *)&cmd->pad_bytes,
2826                                 (u8 *)&cmd->data_crc);
2827
2828                         iov[niov].iov_base = &cmd->data_crc;
2829                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2830                         tx_size += ISCSI_CRC_LEN;
2831                         pr_debug("Attached DataDigest for %u"
2832                                 " bytes of ping data, CRC 0x%08x\n",
2833                                 cmd->buf_ptr_size, cmd->data_crc);
2834                 }
2835         }
2836
2837         cmd->iov_misc_count = niov;
2838         cmd->tx_size = tx_size;
2839
2840         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2841                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2842                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2843
2844         return 0;
2845 }
2846
2847 static int iscsit_send_r2t(
2848         struct iscsi_cmd *cmd,
2849         struct iscsi_conn *conn)
2850 {
2851         int tx_size = 0;
2852         struct iscsi_r2t *r2t;
2853         struct iscsi_r2t_rsp *hdr;
2854         int ret;
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                = 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         ret = iscsit_send_tx_data(cmd, conn, 1);
2911         if (ret < 0) {
2912                 iscsit_tx_thread_wait_for_tcp(conn);
2913                 return ret;
2914         }
2915
2916         spin_lock_bh(&cmd->dataout_timeout_lock);
2917         iscsit_start_dataout_timer(cmd, conn);
2918         spin_unlock_bh(&cmd->dataout_timeout_lock);
2919
2920         return 0;
2921 }
2922
2923 /*
2924  *      @recovery: If called from iscsi_task_reassign_complete_write() for
2925  *              connection recovery.
2926  */
2927 int iscsit_build_r2ts_for_cmd(
2928         struct iscsi_cmd *cmd,
2929         struct iscsi_conn *conn,
2930         bool recovery)
2931 {
2932         int first_r2t = 1;
2933         u32 offset = 0, xfer_len = 0;
2934
2935         spin_lock_bh(&cmd->r2t_lock);
2936         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2937                 spin_unlock_bh(&cmd->r2t_lock);
2938                 return 0;
2939         }
2940
2941         if (conn->sess->sess_ops->DataSequenceInOrder &&
2942             !recovery)
2943                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2944
2945         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2946                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2947                         offset = cmd->r2t_offset;
2948
2949                         if (first_r2t && recovery) {
2950                                 int new_data_end = offset +
2951                                         conn->sess->sess_ops->MaxBurstLength -
2952                                         cmd->next_burst_len;
2953
2954                                 if (new_data_end > cmd->se_cmd.data_length)
2955                                         xfer_len = cmd->se_cmd.data_length - offset;
2956                                 else
2957                                         xfer_len =
2958                                                 conn->sess->sess_ops->MaxBurstLength -
2959                                                 cmd->next_burst_len;
2960                         } else {
2961                                 int new_data_end = offset +
2962                                         conn->sess->sess_ops->MaxBurstLength;
2963
2964                                 if (new_data_end > cmd->se_cmd.data_length)
2965                                         xfer_len = cmd->se_cmd.data_length - offset;
2966                                 else
2967                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
2968                         }
2969                         cmd->r2t_offset += xfer_len;
2970
2971                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
2972                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2973                 } else {
2974                         struct iscsi_seq *seq;
2975
2976                         seq = iscsit_get_seq_holder_for_r2t(cmd);
2977                         if (!seq) {
2978                                 spin_unlock_bh(&cmd->r2t_lock);
2979                                 return -1;
2980                         }
2981
2982                         offset = seq->offset;
2983                         xfer_len = seq->xfer_len;
2984
2985                         if (cmd->seq_send_order == cmd->seq_count)
2986                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2987                 }
2988                 cmd->outstanding_r2ts++;
2989                 first_r2t = 0;
2990
2991                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
2992                         spin_unlock_bh(&cmd->r2t_lock);
2993                         return -1;
2994                 }
2995
2996                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
2997                         break;
2998         }
2999         spin_unlock_bh(&cmd->r2t_lock);
3000
3001         return 0;
3002 }
3003
3004 static int iscsit_send_status(
3005         struct iscsi_cmd *cmd,
3006         struct iscsi_conn *conn)
3007 {
3008         u8 iov_count = 0, recovery;
3009         u32 padding = 0, tx_size = 0;
3010         struct iscsi_scsi_rsp *hdr;
3011         struct kvec *iov;
3012
3013         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3014         if (!recovery)
3015                 cmd->stat_sn = conn->stat_sn++;
3016
3017         spin_lock_bh(&conn->sess->session_stats_lock);
3018         conn->sess->rsp_pdus++;
3019         spin_unlock_bh(&conn->sess->session_stats_lock);
3020
3021         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3022         memset(hdr, 0, ISCSI_HDR_LEN);
3023         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3024         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3025         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3026                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3027                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3028         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3029                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3030                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3031         }
3032         hdr->response           = cmd->iscsi_response;
3033         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3034         hdr->itt                = cmd->init_task_tag;
3035         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3036
3037         iscsit_increment_maxcmdsn(cmd, conn->sess);
3038         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3039         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3040
3041         iov = &cmd->iov_misc[0];
3042         iov[iov_count].iov_base = cmd->pdu;
3043         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3044         tx_size += ISCSI_HDR_LEN;
3045
3046         /*
3047          * Attach SENSE DATA payload to iSCSI Response PDU
3048          */
3049         if (cmd->se_cmd.sense_buffer &&
3050            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3051             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3052                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3053                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3054
3055                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3056                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3057                 iov[iov_count].iov_base = cmd->sense_buffer;
3058                 iov[iov_count++].iov_len =
3059                                 (cmd->se_cmd.scsi_sense_length + padding);
3060                 tx_size += cmd->se_cmd.scsi_sense_length;
3061
3062                 if (padding) {
3063                         memset(cmd->sense_buffer +
3064                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3065                         tx_size += padding;
3066                         pr_debug("Adding %u bytes of padding to"
3067                                 " SENSE.\n", padding);
3068                 }
3069
3070                 if (conn->conn_ops->DataDigest) {
3071                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3072                                 cmd->sense_buffer,
3073                                 (cmd->se_cmd.scsi_sense_length + padding),
3074                                 0, NULL, (u8 *)&cmd->data_crc);
3075
3076                         iov[iov_count].iov_base    = &cmd->data_crc;
3077                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3078                         tx_size += ISCSI_CRC_LEN;
3079
3080                         pr_debug("Attaching CRC32 DataDigest for"
3081                                 " SENSE, %u bytes CRC 0x%08x\n",
3082                                 (cmd->se_cmd.scsi_sense_length + padding),
3083                                 cmd->data_crc);
3084                 }
3085
3086                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3087                                 " Response PDU\n",
3088                                 cmd->se_cmd.scsi_sense_length);
3089         }
3090
3091         if (conn->conn_ops->HeaderDigest) {
3092                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3093
3094                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3095                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3096                                 0, NULL, (u8 *)header_digest);
3097
3098                 iov[0].iov_len += ISCSI_CRC_LEN;
3099                 tx_size += ISCSI_CRC_LEN;
3100                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3101                                 " PDU 0x%08x\n", *header_digest);
3102         }
3103
3104         cmd->iov_misc_count = iov_count;
3105         cmd->tx_size = tx_size;
3106
3107         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3108                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3109                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3110                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3111
3112         return 0;
3113 }
3114
3115 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3116 {
3117         switch (se_tmr->response) {
3118         case TMR_FUNCTION_COMPLETE:
3119                 return ISCSI_TMF_RSP_COMPLETE;
3120         case TMR_TASK_DOES_NOT_EXIST:
3121                 return ISCSI_TMF_RSP_NO_TASK;
3122         case TMR_LUN_DOES_NOT_EXIST:
3123                 return ISCSI_TMF_RSP_NO_LUN;
3124         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3125                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3126         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3127                 return ISCSI_TMF_RSP_AUTH_FAILED;
3128         case TMR_FUNCTION_REJECTED:
3129         default:
3130                 return ISCSI_TMF_RSP_REJECTED;
3131         }
3132 }
3133
3134 static int iscsit_send_task_mgt_rsp(
3135         struct iscsi_cmd *cmd,
3136         struct iscsi_conn *conn)
3137 {
3138         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3139         struct iscsi_tm_rsp *hdr;
3140         u32 tx_size = 0;
3141
3142         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3143         memset(hdr, 0, ISCSI_HDR_LEN);
3144         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3145         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3146         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3147         hdr->itt                = cmd->init_task_tag;
3148         cmd->stat_sn            = conn->stat_sn++;
3149         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3150
3151         iscsit_increment_maxcmdsn(cmd, conn->sess);
3152         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3153         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3154
3155         cmd->iov_misc[0].iov_base       = cmd->pdu;
3156         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3157         tx_size += ISCSI_HDR_LEN;
3158
3159         if (conn->conn_ops->HeaderDigest) {
3160                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3161
3162                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3163                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3164                                 0, NULL, (u8 *)header_digest);
3165
3166                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3167                 tx_size += ISCSI_CRC_LEN;
3168                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3169                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3170         }
3171
3172         cmd->iov_misc_count = 1;
3173         cmd->tx_size = tx_size;
3174
3175         pr_debug("Built Task Management Response ITT: 0x%08x,"
3176                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3177                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3178
3179         return 0;
3180 }
3181
3182 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3183 {
3184         bool ret = false;
3185
3186         if (np->np_sockaddr.ss_family == AF_INET6) {
3187                 const struct sockaddr_in6 sin6 = {
3188                         .sin6_addr = IN6ADDR_ANY_INIT };
3189                 struct sockaddr_in6 *sock_in6 =
3190                          (struct sockaddr_in6 *)&np->np_sockaddr;
3191
3192                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3193                                 sin6.sin6_addr.s6_addr, 16))
3194                         ret = true;
3195         } else {
3196                 struct sockaddr_in * sock_in =
3197                         (struct sockaddr_in *)&np->np_sockaddr;
3198
3199                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3200                         ret = true;
3201         }
3202
3203         return ret;
3204 }
3205
3206 #define SENDTARGETS_BUF_LIMIT 32768U
3207
3208 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3209 {
3210         char *payload = NULL;
3211         struct iscsi_conn *conn = cmd->conn;
3212         struct iscsi_portal_group *tpg;
3213         struct iscsi_tiqn *tiqn;
3214         struct iscsi_tpg_np *tpg_np;
3215         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3216         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3217
3218         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3219                          SENDTARGETS_BUF_LIMIT);
3220
3221         payload = kzalloc(buffer_len, GFP_KERNEL);
3222         if (!payload) {
3223                 pr_err("Unable to allocate memory for sendtargets"
3224                                 " response.\n");
3225                 return -ENOMEM;
3226         }
3227
3228         spin_lock(&tiqn_lock);
3229         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3230                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3231                 len += 1;
3232
3233                 if ((len + payload_len) > buffer_len) {
3234                         end_of_buf = 1;
3235                         goto eob;
3236                 }
3237                 memcpy(payload + payload_len, buf, len);
3238                 payload_len += len;
3239
3240                 spin_lock(&tiqn->tiqn_tpg_lock);
3241                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3242
3243                         spin_lock(&tpg->tpg_state_lock);
3244                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3245                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3246                                 spin_unlock(&tpg->tpg_state_lock);
3247                                 continue;
3248                         }
3249                         spin_unlock(&tpg->tpg_state_lock);
3250
3251                         spin_lock(&tpg->tpg_np_lock);
3252                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3253                                                 tpg_np_list) {
3254                                 struct iscsi_np *np = tpg_np->tpg_np;
3255                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3256
3257                                 len = sprintf(buf, "TargetAddress="
3258                                         "%s%s%s:%hu,%hu",
3259                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3260                                         "[" : "", (inaddr_any == false) ?
3261                                                 np->np_ip : conn->local_ip,
3262                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3263                                         "]" : "", (inaddr_any == false) ?
3264                                                 np->np_port : conn->local_port,
3265                                         tpg->tpgt);
3266                                 len += 1;
3267
3268                                 if ((len + payload_len) > buffer_len) {
3269                                         spin_unlock(&tpg->tpg_np_lock);
3270                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3271                                         end_of_buf = 1;
3272                                         goto eob;
3273                                 }
3274                                 memcpy(payload + payload_len, buf, len);
3275                                 payload_len += len;
3276                         }
3277                         spin_unlock(&tpg->tpg_np_lock);
3278                 }
3279                 spin_unlock(&tiqn->tiqn_tpg_lock);
3280 eob:
3281                 if (end_of_buf)
3282                         break;
3283         }
3284         spin_unlock(&tiqn_lock);
3285
3286         cmd->buf_ptr = payload;
3287
3288         return payload_len;
3289 }
3290
3291 /*
3292  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3293  *      MaxRecvDataSegmentLength.
3294  */
3295 static int iscsit_send_text_rsp(
3296         struct iscsi_cmd *cmd,
3297         struct iscsi_conn *conn)
3298 {
3299         struct iscsi_text_rsp *hdr;
3300         struct kvec *iov;
3301         u32 padding = 0, tx_size = 0;
3302         int text_length, iov_count = 0;
3303
3304         text_length = iscsit_build_sendtargets_response(cmd);
3305         if (text_length < 0)
3306                 return text_length;
3307
3308         padding = ((-text_length) & 3);
3309         if (padding != 0) {
3310                 memset(cmd->buf_ptr + text_length, 0, padding);
3311                 pr_debug("Attaching %u additional bytes for"
3312                         " padding.\n", padding);
3313         }
3314
3315         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3316         memset(hdr, 0, ISCSI_HDR_LEN);
3317         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3318         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3319         hton24(hdr->dlength, text_length);
3320         hdr->itt                = cmd->init_task_tag;
3321         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3322         cmd->stat_sn            = conn->stat_sn++;
3323         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3324
3325         iscsit_increment_maxcmdsn(cmd, conn->sess);
3326         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3327         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3328
3329         iov = &cmd->iov_misc[0];
3330
3331         iov[iov_count].iov_base = cmd->pdu;
3332         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3333         iov[iov_count].iov_base = cmd->buf_ptr;
3334         iov[iov_count++].iov_len = text_length + padding;
3335
3336         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3337
3338         if (conn->conn_ops->HeaderDigest) {
3339                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3340
3341                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3342                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3343                                 0, NULL, (u8 *)header_digest);
3344
3345                 iov[0].iov_len += ISCSI_CRC_LEN;
3346                 tx_size += ISCSI_CRC_LEN;
3347                 pr_debug("Attaching CRC32 HeaderDigest for"
3348                         " Text Response PDU 0x%08x\n", *header_digest);
3349         }
3350
3351         if (conn->conn_ops->DataDigest) {
3352                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3353                                 cmd->buf_ptr, (text_length + padding),
3354                                 0, NULL, (u8 *)&cmd->data_crc);
3355
3356                 iov[iov_count].iov_base = &cmd->data_crc;
3357                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3358                 tx_size += ISCSI_CRC_LEN;
3359
3360                 pr_debug("Attaching DataDigest for %u bytes of text"
3361                         " data, CRC 0x%08x\n", (text_length + padding),
3362                         cmd->data_crc);
3363         }
3364
3365         cmd->iov_misc_count = iov_count;
3366         cmd->tx_size = tx_size;
3367
3368         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3369                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3370                         text_length, conn->cid);
3371         return 0;
3372 }
3373
3374 static int iscsit_send_reject(
3375         struct iscsi_cmd *cmd,
3376         struct iscsi_conn *conn)
3377 {
3378         u32 iov_count = 0, tx_size = 0;
3379         struct iscsi_reject *hdr;
3380         struct kvec *iov;
3381
3382         hdr                     = (struct iscsi_reject *) cmd->pdu;
3383         hdr->opcode             = ISCSI_OP_REJECT;
3384         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3385         hton24(hdr->dlength, ISCSI_HDR_LEN);
3386         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3387         cmd->stat_sn            = conn->stat_sn++;
3388         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3389         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3390         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3391
3392         iov = &cmd->iov_misc[0];
3393
3394         iov[iov_count].iov_base = cmd->pdu;
3395         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3396         iov[iov_count].iov_base = cmd->buf_ptr;
3397         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3398
3399         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3400
3401         if (conn->conn_ops->HeaderDigest) {
3402                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3403
3404                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3405                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3406                                 0, NULL, (u8 *)header_digest);
3407
3408                 iov[0].iov_len += ISCSI_CRC_LEN;
3409                 tx_size += ISCSI_CRC_LEN;
3410                 pr_debug("Attaching CRC32 HeaderDigest for"
3411                         " REJECT PDU 0x%08x\n", *header_digest);
3412         }
3413
3414         if (conn->conn_ops->DataDigest) {
3415                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3416                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3417                                 0, NULL, (u8 *)&cmd->data_crc);
3418
3419                 iov[iov_count].iov_base = &cmd->data_crc;
3420                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3421                 tx_size += ISCSI_CRC_LEN;
3422                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3423                                 " PDU 0x%08x\n", cmd->data_crc);
3424         }
3425
3426         cmd->iov_misc_count = iov_count;
3427         cmd->tx_size = tx_size;
3428
3429         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3430                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3431
3432         return 0;
3433 }
3434
3435 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3436 {
3437         struct iscsi_thread_set *ts = conn->thread_set;
3438         int ord, cpu;
3439         /*
3440          * thread_id is assigned from iscsit_global->ts_bitmap from
3441          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3442          *
3443          * Here we use thread_id to determine which CPU that this
3444          * iSCSI connection's iscsi_thread_set will be scheduled to
3445          * execute upon.
3446          */
3447         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
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         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3488 }
3489
3490 static int handle_immediate_queue(struct iscsi_conn *conn)
3491 {
3492         struct iscsi_queue_req *qr;
3493         struct iscsi_cmd *cmd;
3494         u8 state;
3495         int ret;
3496
3497         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3498                 atomic_set(&conn->check_immediate_queue, 0);
3499                 cmd = qr->cmd;
3500                 state = qr->state;
3501                 kmem_cache_free(lio_qr_cache, qr);
3502
3503                 switch (state) {
3504                 case ISTATE_SEND_R2T:
3505                         ret = iscsit_send_r2t(cmd, conn);
3506                         if (ret < 0)
3507                                 goto err;
3508                         break;
3509                 case ISTATE_REMOVE:
3510                         if (cmd->data_direction == DMA_TO_DEVICE)
3511                                 iscsit_stop_dataout_timer(cmd);
3512
3513                         spin_lock_bh(&conn->cmd_lock);
3514                         list_del(&cmd->i_conn_node);
3515                         spin_unlock_bh(&conn->cmd_lock);
3516
3517                         iscsit_free_cmd(cmd);
3518                         continue;
3519                 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3520                         iscsit_mod_nopin_response_timer(conn);
3521                         ret = iscsit_send_unsolicited_nopin(cmd,
3522                                                             conn, 1);
3523                         if (ret < 0)
3524                                 goto err;
3525                         break;
3526                 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3527                         ret = iscsit_send_unsolicited_nopin(cmd,
3528                                                             conn, 0);
3529                         if (ret < 0)
3530                                 goto err;
3531                         break;
3532                 default:
3533                         pr_err("Unknown Opcode: 0x%02x ITT:"
3534                                " 0x%08x, i_state: %d on CID: %hu\n",
3535                                cmd->iscsi_opcode, cmd->init_task_tag, state,
3536                                conn->cid);
3537                         goto err;
3538                 }
3539         }
3540
3541         return 0;
3542
3543 err:
3544         return -1;
3545 }
3546
3547 static int handle_response_queue(struct iscsi_conn *conn)
3548 {
3549         struct iscsi_queue_req *qr;
3550         struct iscsi_cmd *cmd;
3551         u8 state;
3552         int ret;
3553
3554         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3555                 cmd = qr->cmd;
3556                 state = qr->state;
3557                 kmem_cache_free(lio_qr_cache, qr);
3558
3559 check_rsp_state:
3560                 switch (state) {
3561                 case ISTATE_SEND_DATAIN:
3562                         ret = iscsit_send_data_in(cmd, conn);
3563                         if (ret < 0)
3564                                 goto err;
3565                         else if (!ret)
3566                                 /* more drs */
3567                                 goto check_rsp_state;
3568                         else if (ret == 1) {
3569                                 /* all done */
3570                                 spin_lock_bh(&cmd->istate_lock);
3571                                 cmd->i_state = ISTATE_SENT_STATUS;
3572                                 spin_unlock_bh(&cmd->istate_lock);
3573                                 continue;
3574                         } else if (ret == 2) {
3575                                 /* Still must send status,
3576                                    SCF_TRANSPORT_TASK_SENSE was set */
3577                                 spin_lock_bh(&cmd->istate_lock);
3578                                 cmd->i_state = ISTATE_SEND_STATUS;
3579                                 spin_unlock_bh(&cmd->istate_lock);
3580                                 state = ISTATE_SEND_STATUS;
3581                                 goto check_rsp_state;
3582                         }
3583
3584                         break;
3585                 case ISTATE_SEND_STATUS:
3586                 case ISTATE_SEND_STATUS_RECOVERY:
3587                         ret = iscsit_send_status(cmd, conn);
3588                         break;
3589                 case ISTATE_SEND_LOGOUTRSP:
3590                         ret = iscsit_send_logout_response(cmd, conn);
3591                         break;
3592                 case ISTATE_SEND_ASYNCMSG:
3593                         ret = iscsit_send_conn_drop_async_message(
3594                                 cmd, conn);
3595                         break;
3596                 case ISTATE_SEND_NOPIN:
3597                         ret = iscsit_send_nopin_response(cmd, conn);
3598                         break;
3599                 case ISTATE_SEND_REJECT:
3600                         ret = iscsit_send_reject(cmd, conn);
3601                         break;
3602                 case ISTATE_SEND_TASKMGTRSP:
3603                         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3604                         if (ret != 0)
3605                                 break;
3606                         ret = iscsit_tmr_post_handler(cmd, conn);
3607                         if (ret != 0)
3608                                 iscsit_fall_back_to_erl0(conn->sess);
3609                         break;
3610                 case ISTATE_SEND_TEXTRSP:
3611                         ret = iscsit_send_text_rsp(cmd, conn);
3612                         break;
3613                 default:
3614                         pr_err("Unknown Opcode: 0x%02x ITT:"
3615                                " 0x%08x, i_state: %d on CID: %hu\n",
3616                                cmd->iscsi_opcode, cmd->init_task_tag,
3617                                state, conn->cid);
3618                         goto err;
3619                 }
3620                 if (ret < 0)
3621                         goto err;
3622
3623                 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3624                         iscsit_tx_thread_wait_for_tcp(conn);
3625                         iscsit_unmap_iovec(cmd);
3626                         goto err;
3627                 }
3628                 iscsit_unmap_iovec(cmd);
3629
3630                 switch (state) {
3631                 case ISTATE_SEND_LOGOUTRSP:
3632                         if (!iscsit_logout_post_handler(cmd, conn))
3633                                 goto restart;
3634                         /* fall through */
3635                 case ISTATE_SEND_STATUS:
3636                 case ISTATE_SEND_ASYNCMSG:
3637                 case ISTATE_SEND_NOPIN:
3638                 case ISTATE_SEND_STATUS_RECOVERY:
3639                 case ISTATE_SEND_TEXTRSP:
3640                 case ISTATE_SEND_TASKMGTRSP:
3641                         spin_lock_bh(&cmd->istate_lock);
3642                         cmd->i_state = ISTATE_SENT_STATUS;
3643                         spin_unlock_bh(&cmd->istate_lock);
3644                         break;
3645                 case ISTATE_SEND_REJECT:
3646                         if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3647                                 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3648                                 complete(&cmd->reject_comp);
3649                                 goto err;
3650                         }
3651                         complete(&cmd->reject_comp);
3652                         break;
3653                 default:
3654                         pr_err("Unknown Opcode: 0x%02x ITT:"
3655                                " 0x%08x, i_state: %d on CID: %hu\n",
3656                                cmd->iscsi_opcode, cmd->init_task_tag,
3657                                cmd->i_state, conn->cid);
3658                         goto err;
3659                 }
3660
3661                 if (atomic_read(&conn->check_immediate_queue))
3662                         break;
3663         }
3664
3665         return 0;
3666
3667 err:
3668         return -1;
3669 restart:
3670         return -EAGAIN;
3671 }
3672
3673 int iscsi_target_tx_thread(void *arg)
3674 {
3675         int ret = 0;
3676         struct iscsi_conn *conn;
3677         struct iscsi_thread_set *ts = arg;
3678         /*
3679          * Allow ourselves to be interrupted by SIGINT so that a
3680          * connection recovery / failure event can be triggered externally.
3681          */
3682         allow_signal(SIGINT);
3683
3684 restart:
3685         conn = iscsi_tx_thread_pre_handler(ts);
3686         if (!conn)
3687                 goto out;
3688
3689         ret = 0;
3690
3691         while (!kthread_should_stop()) {
3692                 /*
3693                  * Ensure that both TX and RX per connection kthreads
3694                  * are scheduled to run on the same CPU.
3695                  */
3696                 iscsit_thread_check_cpumask(conn, current, 1);
3697
3698                 wait_event_interruptible(conn->queues_wq,
3699                                          !iscsit_conn_all_queues_empty(conn) ||
3700                                          ts->status == ISCSI_THREAD_SET_RESET);
3701
3702                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3703                      signal_pending(current))
3704                         goto transport_err;
3705
3706                 ret = handle_immediate_queue(conn);
3707                 if (ret < 0)
3708                         goto transport_err;
3709
3710                 ret = handle_response_queue(conn);
3711                 if (ret == -EAGAIN)
3712                         goto restart;
3713                 else if (ret < 0)
3714                         goto transport_err;
3715         }
3716
3717 transport_err:
3718         iscsit_take_action_for_connection_exit(conn);
3719         goto restart;
3720 out:
3721         return 0;
3722 }
3723
3724 int iscsi_target_rx_thread(void *arg)
3725 {
3726         int ret;
3727         u8 buffer[ISCSI_HDR_LEN], opcode;
3728         u32 checksum = 0, digest = 0;
3729         struct iscsi_conn *conn = NULL;
3730         struct iscsi_thread_set *ts = arg;
3731         struct kvec iov;
3732         /*
3733          * Allow ourselves to be interrupted by SIGINT so that a
3734          * connection recovery / failure event can be triggered externally.
3735          */
3736         allow_signal(SIGINT);
3737
3738 restart:
3739         conn = iscsi_rx_thread_pre_handler(ts);
3740         if (!conn)
3741                 goto out;
3742
3743         while (!kthread_should_stop()) {
3744                 /*
3745                  * Ensure that both TX and RX per connection kthreads
3746                  * are scheduled to run on the same CPU.
3747                  */
3748                 iscsit_thread_check_cpumask(conn, current, 0);
3749
3750                 memset(buffer, 0, ISCSI_HDR_LEN);
3751                 memset(&iov, 0, sizeof(struct kvec));
3752
3753                 iov.iov_base    = buffer;
3754                 iov.iov_len     = ISCSI_HDR_LEN;
3755
3756                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3757                 if (ret != ISCSI_HDR_LEN) {
3758                         iscsit_rx_thread_wait_for_tcp(conn);
3759                         goto transport_err;
3760                 }
3761
3762                 /*
3763                  * Set conn->bad_hdr for use with REJECT PDUs.
3764                  */
3765                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3766
3767                 if (conn->conn_ops->HeaderDigest) {
3768                         iov.iov_base    = &digest;
3769                         iov.iov_len     = ISCSI_CRC_LEN;
3770
3771                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3772                         if (ret != ISCSI_CRC_LEN) {
3773                                 iscsit_rx_thread_wait_for_tcp(conn);
3774                                 goto transport_err;
3775                         }
3776
3777                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3778                                         buffer, ISCSI_HDR_LEN,
3779                                         0, NULL, (u8 *)&checksum);
3780
3781                         if (digest != checksum) {
3782                                 pr_err("HeaderDigest CRC32C failed,"
3783                                         " received 0x%08x, computed 0x%08x\n",
3784                                         digest, checksum);
3785                                 /*
3786                                  * Set the PDU to 0xff so it will intentionally
3787                                  * hit default in the switch below.
3788                                  */
3789                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3790                                 spin_lock_bh(&conn->sess->session_stats_lock);
3791                                 conn->sess->conn_digest_errors++;
3792                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3793                         } else {
3794                                 pr_debug("Got HeaderDigest CRC32C"
3795                                                 " 0x%08x\n", checksum);
3796                         }
3797                 }
3798
3799                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3800                         goto transport_err;
3801
3802                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3803
3804                 if (conn->sess->sess_ops->SessionType &&
3805                    ((!(opcode & ISCSI_OP_TEXT)) ||
3806                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3807                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3808                         " while in Discovery Session, rejecting.\n", opcode);
3809                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3810                                         buffer, conn);
3811                         goto transport_err;
3812                 }
3813
3814                 switch (opcode) {
3815                 case ISCSI_OP_SCSI_CMD:
3816                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3817                                 goto transport_err;
3818                         break;
3819                 case ISCSI_OP_SCSI_DATA_OUT:
3820                         if (iscsit_handle_data_out(conn, buffer) < 0)
3821                                 goto transport_err;
3822                         break;
3823                 case ISCSI_OP_NOOP_OUT:
3824                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3825                                 goto transport_err;
3826                         break;
3827                 case ISCSI_OP_SCSI_TMFUNC:
3828                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3829                                 goto transport_err;
3830                         break;
3831                 case ISCSI_OP_TEXT:
3832                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3833                                 goto transport_err;
3834                         break;
3835                 case ISCSI_OP_LOGOUT:
3836                         ret = iscsit_handle_logout_cmd(conn, buffer);
3837                         if (ret > 0) {
3838                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3839                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3840                                 goto transport_err;
3841                         } else if (ret < 0)
3842                                 goto transport_err;
3843                         break;
3844                 case ISCSI_OP_SNACK:
3845                         if (iscsit_handle_snack(conn, buffer) < 0)
3846                                 goto transport_err;
3847                         break;
3848                 default:
3849                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3850                                         opcode);
3851                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3852                                 pr_err("Cannot recover from unknown"
3853                                 " opcode while ERL=0, closing iSCSI connection"
3854                                 ".\n");
3855                                 goto transport_err;
3856                         }
3857                         if (!conn->conn_ops->OFMarker) {
3858                                 pr_err("Unable to recover from unknown"
3859                                 " opcode while OFMarker=No, closing iSCSI"
3860                                         " connection.\n");
3861                                 goto transport_err;
3862                         }
3863                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3864                                 pr_err("Unable to recover from unknown"
3865                                         " opcode, closing iSCSI connection.\n");
3866                                 goto transport_err;
3867                         }
3868                         break;
3869                 }
3870         }
3871
3872 transport_err:
3873         if (!signal_pending(current))
3874                 atomic_set(&conn->transport_failed, 1);
3875         iscsit_take_action_for_connection_exit(conn);
3876         goto restart;
3877 out:
3878         return 0;
3879 }
3880
3881 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3882 {
3883         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3884         struct iscsi_session *sess = conn->sess;
3885         /*
3886          * We expect this function to only ever be called from either RX or TX
3887          * thread context via iscsit_close_connection() once the other context
3888          * has been reset -> returned sleeping pre-handler state.
3889          */
3890         spin_lock_bh(&conn->cmd_lock);
3891         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3892
3893                 list_del(&cmd->i_conn_node);
3894                 spin_unlock_bh(&conn->cmd_lock);
3895
3896                 iscsit_increment_maxcmdsn(cmd, sess);
3897
3898                 iscsit_free_cmd(cmd);
3899
3900                 spin_lock_bh(&conn->cmd_lock);
3901         }
3902         spin_unlock_bh(&conn->cmd_lock);
3903 }
3904
3905 static void iscsit_stop_timers_for_cmds(
3906         struct iscsi_conn *conn)
3907 {
3908         struct iscsi_cmd *cmd;
3909
3910         spin_lock_bh(&conn->cmd_lock);
3911         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3912                 if (cmd->data_direction == DMA_TO_DEVICE)
3913                         iscsit_stop_dataout_timer(cmd);
3914         }
3915         spin_unlock_bh(&conn->cmd_lock);
3916 }
3917
3918 int iscsit_close_connection(
3919         struct iscsi_conn *conn)
3920 {
3921         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3922         struct iscsi_session    *sess = conn->sess;
3923
3924         pr_debug("Closing iSCSI connection CID %hu on SID:"
3925                 " %u\n", conn->cid, sess->sid);
3926         /*
3927          * Always up conn_logout_comp just in case the RX Thread is sleeping
3928          * and the logout response never got sent because the connection
3929          * failed.
3930          */
3931         complete(&conn->conn_logout_comp);
3932
3933         iscsi_release_thread_set(conn);
3934
3935         iscsit_stop_timers_for_cmds(conn);
3936         iscsit_stop_nopin_response_timer(conn);
3937         iscsit_stop_nopin_timer(conn);
3938         iscsit_free_queue_reqs_for_conn(conn);
3939
3940         /*
3941          * During Connection recovery drop unacknowledged out of order
3942          * commands for this connection, and prepare the other commands
3943          * for realligence.
3944          *
3945          * During normal operation clear the out of order commands (but
3946          * do not free the struct iscsi_ooo_cmdsn's) and release all
3947          * struct iscsi_cmds.
3948          */
3949         if (atomic_read(&conn->connection_recovery)) {
3950                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3951                 iscsit_prepare_cmds_for_realligance(conn);
3952         } else {
3953                 iscsit_clear_ooo_cmdsns_for_conn(conn);
3954                 iscsit_release_commands_from_conn(conn);
3955         }
3956
3957         /*
3958          * Handle decrementing session or connection usage count if
3959          * a logout response was not able to be sent because the
3960          * connection failed.  Fall back to Session Recovery here.
3961          */
3962         if (atomic_read(&conn->conn_logout_remove)) {
3963                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3964                         iscsit_dec_conn_usage_count(conn);
3965                         iscsit_dec_session_usage_count(sess);
3966                 }
3967                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3968                         iscsit_dec_conn_usage_count(conn);
3969
3970                 atomic_set(&conn->conn_logout_remove, 0);
3971                 atomic_set(&sess->session_reinstatement, 0);
3972                 atomic_set(&sess->session_fall_back_to_erl0, 1);
3973         }
3974
3975         spin_lock_bh(&sess->conn_lock);
3976         list_del(&conn->conn_list);
3977
3978         /*
3979          * Attempt to let the Initiator know this connection failed by
3980          * sending an Connection Dropped Async Message on another
3981          * active connection.
3982          */
3983         if (atomic_read(&conn->connection_recovery))
3984                 iscsit_build_conn_drop_async_message(conn);
3985
3986         spin_unlock_bh(&sess->conn_lock);
3987
3988         /*
3989          * If connection reinstatement is being performed on this connection,
3990          * up the connection reinstatement semaphore that is being blocked on
3991          * in iscsit_cause_connection_reinstatement().
3992          */
3993         spin_lock_bh(&conn->state_lock);
3994         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
3995                 spin_unlock_bh(&conn->state_lock);
3996                 complete(&conn->conn_wait_comp);
3997                 wait_for_completion(&conn->conn_post_wait_comp);
3998                 spin_lock_bh(&conn->state_lock);
3999         }
4000
4001         /*
4002          * If connection reinstatement is being performed on this connection
4003          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4004          * connection wait rcfr semaphore that is being blocked on
4005          * an iscsit_connection_reinstatement_rcfr().
4006          */
4007         if (atomic_read(&conn->connection_wait_rcfr)) {
4008                 spin_unlock_bh(&conn->state_lock);
4009                 complete(&conn->conn_wait_rcfr_comp);
4010                 wait_for_completion(&conn->conn_post_wait_comp);
4011                 spin_lock_bh(&conn->state_lock);
4012         }
4013         atomic_set(&conn->connection_reinstatement, 1);
4014         spin_unlock_bh(&conn->state_lock);
4015
4016         /*
4017          * If any other processes are accessing this connection pointer we
4018          * must wait until they have completed.
4019          */
4020         iscsit_check_conn_usage_count(conn);
4021
4022         if (conn->conn_rx_hash.tfm)
4023                 crypto_free_hash(conn->conn_rx_hash.tfm);
4024         if (conn->conn_tx_hash.tfm)
4025                 crypto_free_hash(conn->conn_tx_hash.tfm);
4026
4027         if (conn->conn_cpumask)
4028                 free_cpumask_var(conn->conn_cpumask);
4029
4030         kfree(conn->conn_ops);
4031         conn->conn_ops = NULL;
4032
4033         if (conn->sock)
4034                 sock_release(conn->sock);
4035         conn->thread_set = NULL;
4036
4037         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4038         conn->conn_state = TARG_CONN_STATE_FREE;
4039         kfree(conn);
4040
4041         spin_lock_bh(&sess->conn_lock);
4042         atomic_dec(&sess->nconn);
4043         pr_debug("Decremented iSCSI connection count to %hu from node:"
4044                 " %s\n", atomic_read(&sess->nconn),
4045                 sess->sess_ops->InitiatorName);
4046         /*
4047          * Make sure that if one connection fails in an non ERL=2 iSCSI
4048          * Session that they all fail.
4049          */
4050         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4051              !atomic_read(&sess->session_logout))
4052                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4053
4054         /*
4055          * If this was not the last connection in the session, and we are
4056          * performing session reinstatement or falling back to ERL=0, call
4057          * iscsit_stop_session() without sleeping to shutdown the other
4058          * active connections.
4059          */
4060         if (atomic_read(&sess->nconn)) {
4061                 if (!atomic_read(&sess->session_reinstatement) &&
4062                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4063                         spin_unlock_bh(&sess->conn_lock);
4064                         return 0;
4065                 }
4066                 if (!atomic_read(&sess->session_stop_active)) {
4067                         atomic_set(&sess->session_stop_active, 1);
4068                         spin_unlock_bh(&sess->conn_lock);
4069                         iscsit_stop_session(sess, 0, 0);
4070                         return 0;
4071                 }
4072                 spin_unlock_bh(&sess->conn_lock);
4073                 return 0;
4074         }
4075
4076         /*
4077          * If this was the last connection in the session and one of the
4078          * following is occurring:
4079          *
4080          * Session Reinstatement is not being performed, and are falling back
4081          * to ERL=0 call iscsit_close_session().
4082          *
4083          * Session Logout was requested.  iscsit_close_session() will be called
4084          * elsewhere.
4085          *
4086          * Session Continuation is not being performed, start the Time2Retain
4087          * handler and check if sleep_on_sess_wait_sem is active.
4088          */
4089         if (!atomic_read(&sess->session_reinstatement) &&
4090              atomic_read(&sess->session_fall_back_to_erl0)) {
4091                 spin_unlock_bh(&sess->conn_lock);
4092                 target_put_session(sess->se_sess);
4093
4094                 return 0;
4095         } else if (atomic_read(&sess->session_logout)) {
4096                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4097                 sess->session_state = TARG_SESS_STATE_FREE;
4098                 spin_unlock_bh(&sess->conn_lock);
4099
4100                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4101                         complete(&sess->session_wait_comp);
4102
4103                 return 0;
4104         } else {
4105                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4106                 sess->session_state = TARG_SESS_STATE_FAILED;
4107
4108                 if (!atomic_read(&sess->session_continuation)) {
4109                         spin_unlock_bh(&sess->conn_lock);
4110                         iscsit_start_time2retain_handler(sess);
4111                 } else
4112                         spin_unlock_bh(&sess->conn_lock);
4113
4114                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4115                         complete(&sess->session_wait_comp);
4116
4117                 return 0;
4118         }
4119         spin_unlock_bh(&sess->conn_lock);
4120
4121         return 0;
4122 }
4123
4124 int iscsit_close_session(struct iscsi_session *sess)
4125 {
4126         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4127         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4128
4129         if (atomic_read(&sess->nconn)) {
4130                 pr_err("%d connection(s) still exist for iSCSI session"
4131                         " to %s\n", atomic_read(&sess->nconn),
4132                         sess->sess_ops->InitiatorName);
4133                 BUG();
4134         }
4135
4136         spin_lock_bh(&se_tpg->session_lock);
4137         atomic_set(&sess->session_logout, 1);
4138         atomic_set(&sess->session_reinstatement, 1);
4139         iscsit_stop_time2retain_timer(sess);
4140         spin_unlock_bh(&se_tpg->session_lock);
4141
4142         /*
4143          * transport_deregister_session_configfs() will clear the
4144          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4145          * can be setting it again with __transport_register_session() in
4146          * iscsi_post_login_handler() again after the iscsit_stop_session()
4147          * completes in iscsi_np context.
4148          */
4149         transport_deregister_session_configfs(sess->se_sess);
4150
4151         /*
4152          * If any other processes are accessing this session pointer we must
4153          * wait until they have completed.  If we are in an interrupt (the
4154          * time2retain handler) and contain and active session usage count we
4155          * restart the timer and exit.
4156          */
4157         if (!in_interrupt()) {
4158                 if (iscsit_check_session_usage_count(sess) == 1)
4159                         iscsit_stop_session(sess, 1, 1);
4160         } else {
4161                 if (iscsit_check_session_usage_count(sess) == 2) {
4162                         atomic_set(&sess->session_logout, 0);
4163                         iscsit_start_time2retain_handler(sess);
4164                         return 0;
4165                 }
4166         }
4167
4168         transport_deregister_session(sess->se_sess);
4169
4170         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4171                 iscsit_free_connection_recovery_entires(sess);
4172
4173         iscsit_free_all_ooo_cmdsns(sess);
4174
4175         spin_lock_bh(&se_tpg->session_lock);
4176         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4177         sess->session_state = TARG_SESS_STATE_FREE;
4178         pr_debug("Released iSCSI session from node: %s\n",
4179                         sess->sess_ops->InitiatorName);
4180         tpg->nsessions--;
4181         if (tpg->tpg_tiqn)
4182                 tpg->tpg_tiqn->tiqn_nsessions--;
4183
4184         pr_debug("Decremented number of active iSCSI Sessions on"
4185                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4186
4187         spin_lock(&sess_idr_lock);
4188         idr_remove(&sess_idr, sess->session_index);
4189         spin_unlock(&sess_idr_lock);
4190
4191         kfree(sess->sess_ops);
4192         sess->sess_ops = NULL;
4193         spin_unlock_bh(&se_tpg->session_lock);
4194
4195         kfree(sess);
4196         return 0;
4197 }
4198
4199 static void iscsit_logout_post_handler_closesession(
4200         struct iscsi_conn *conn)
4201 {
4202         struct iscsi_session *sess = conn->sess;
4203
4204         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4205         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4206
4207         atomic_set(&conn->conn_logout_remove, 0);
4208         complete(&conn->conn_logout_comp);
4209
4210         iscsit_dec_conn_usage_count(conn);
4211         iscsit_stop_session(sess, 1, 1);
4212         iscsit_dec_session_usage_count(sess);
4213         target_put_session(sess->se_sess);
4214 }
4215
4216 static void iscsit_logout_post_handler_samecid(
4217         struct iscsi_conn *conn)
4218 {
4219         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4220         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4221
4222         atomic_set(&conn->conn_logout_remove, 0);
4223         complete(&conn->conn_logout_comp);
4224
4225         iscsit_cause_connection_reinstatement(conn, 1);
4226         iscsit_dec_conn_usage_count(conn);
4227 }
4228
4229 static void iscsit_logout_post_handler_diffcid(
4230         struct iscsi_conn *conn,
4231         u16 cid)
4232 {
4233         struct iscsi_conn *l_conn;
4234         struct iscsi_session *sess = conn->sess;
4235
4236         if (!sess)
4237                 return;
4238
4239         spin_lock_bh(&sess->conn_lock);
4240         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4241                 if (l_conn->cid == cid) {
4242                         iscsit_inc_conn_usage_count(l_conn);
4243                         break;
4244                 }
4245         }
4246         spin_unlock_bh(&sess->conn_lock);
4247
4248         if (!l_conn)
4249                 return;
4250
4251         if (l_conn->sock)
4252                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4253
4254         spin_lock_bh(&l_conn->state_lock);
4255         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4256         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4257         spin_unlock_bh(&l_conn->state_lock);
4258
4259         iscsit_cause_connection_reinstatement(l_conn, 1);
4260         iscsit_dec_conn_usage_count(l_conn);
4261 }
4262
4263 /*
4264  *      Return of 0 causes the TX thread to restart.
4265  */
4266 static int iscsit_logout_post_handler(
4267         struct iscsi_cmd *cmd,
4268         struct iscsi_conn *conn)
4269 {
4270         int ret = 0;
4271
4272         switch (cmd->logout_reason) {
4273         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4274                 switch (cmd->logout_response) {
4275                 case ISCSI_LOGOUT_SUCCESS:
4276                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4277                 default:
4278                         iscsit_logout_post_handler_closesession(conn);
4279                         break;
4280                 }
4281                 ret = 0;
4282                 break;
4283         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4284                 if (conn->cid == cmd->logout_cid) {
4285                         switch (cmd->logout_response) {
4286                         case ISCSI_LOGOUT_SUCCESS:
4287                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4288                         default:
4289                                 iscsit_logout_post_handler_samecid(conn);
4290                                 break;
4291                         }
4292                         ret = 0;
4293                 } else {
4294                         switch (cmd->logout_response) {
4295                         case ISCSI_LOGOUT_SUCCESS:
4296                                 iscsit_logout_post_handler_diffcid(conn,
4297                                         cmd->logout_cid);
4298                                 break;
4299                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4300                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4301                         default:
4302                                 break;
4303                         }
4304                         ret = 1;
4305                 }
4306                 break;
4307         case ISCSI_LOGOUT_REASON_RECOVERY:
4308                 switch (cmd->logout_response) {
4309                 case ISCSI_LOGOUT_SUCCESS:
4310                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4311                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4312                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4313                 default:
4314                         break;
4315                 }
4316                 ret = 1;
4317                 break;
4318         default:
4319                 break;
4320
4321         }
4322         return ret;
4323 }
4324
4325 void iscsit_fail_session(struct iscsi_session *sess)
4326 {
4327         struct iscsi_conn *conn;
4328
4329         spin_lock_bh(&sess->conn_lock);
4330         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4331                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4332                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4333         }
4334         spin_unlock_bh(&sess->conn_lock);
4335
4336         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4337         sess->session_state = TARG_SESS_STATE_FAILED;
4338 }
4339
4340 int iscsit_free_session(struct iscsi_session *sess)
4341 {
4342         u16 conn_count = atomic_read(&sess->nconn);
4343         struct iscsi_conn *conn, *conn_tmp = NULL;
4344         int is_last;
4345
4346         spin_lock_bh(&sess->conn_lock);
4347         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4348
4349         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4350                         conn_list) {
4351                 if (conn_count == 0)
4352                         break;
4353
4354                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4355                         is_last = 1;
4356                 } else {
4357                         iscsit_inc_conn_usage_count(conn_tmp);
4358                         is_last = 0;
4359                 }
4360                 iscsit_inc_conn_usage_count(conn);
4361
4362                 spin_unlock_bh(&sess->conn_lock);
4363                 iscsit_cause_connection_reinstatement(conn, 1);
4364                 spin_lock_bh(&sess->conn_lock);
4365
4366                 iscsit_dec_conn_usage_count(conn);
4367                 if (is_last == 0)
4368                         iscsit_dec_conn_usage_count(conn_tmp);
4369
4370                 conn_count--;
4371         }
4372
4373         if (atomic_read(&sess->nconn)) {
4374                 spin_unlock_bh(&sess->conn_lock);
4375                 wait_for_completion(&sess->session_wait_comp);
4376         } else
4377                 spin_unlock_bh(&sess->conn_lock);
4378
4379         target_put_session(sess->se_sess);
4380         return 0;
4381 }
4382
4383 void iscsit_stop_session(
4384         struct iscsi_session *sess,
4385         int session_sleep,
4386         int connection_sleep)
4387 {
4388         u16 conn_count = atomic_read(&sess->nconn);
4389         struct iscsi_conn *conn, *conn_tmp = NULL;
4390         int is_last;
4391
4392         spin_lock_bh(&sess->conn_lock);
4393         if (session_sleep)
4394                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4395
4396         if (connection_sleep) {
4397                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4398                                 conn_list) {
4399                         if (conn_count == 0)
4400                                 break;
4401
4402                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4403                                 is_last = 1;
4404                         } else {
4405                                 iscsit_inc_conn_usage_count(conn_tmp);
4406                                 is_last = 0;
4407                         }
4408                         iscsit_inc_conn_usage_count(conn);
4409
4410                         spin_unlock_bh(&sess->conn_lock);
4411                         iscsit_cause_connection_reinstatement(conn, 1);
4412                         spin_lock_bh(&sess->conn_lock);
4413
4414                         iscsit_dec_conn_usage_count(conn);
4415                         if (is_last == 0)
4416                                 iscsit_dec_conn_usage_count(conn_tmp);
4417                         conn_count--;
4418                 }
4419         } else {
4420                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4421                         iscsit_cause_connection_reinstatement(conn, 0);
4422         }
4423
4424         if (session_sleep && atomic_read(&sess->nconn)) {
4425                 spin_unlock_bh(&sess->conn_lock);
4426                 wait_for_completion(&sess->session_wait_comp);
4427         } else
4428                 spin_unlock_bh(&sess->conn_lock);
4429 }
4430
4431 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4432 {
4433         struct iscsi_session *sess;
4434         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4435         struct se_session *se_sess, *se_sess_tmp;
4436         int session_count = 0;
4437
4438         spin_lock_bh(&se_tpg->session_lock);
4439         if (tpg->nsessions && !force) {
4440                 spin_unlock_bh(&se_tpg->session_lock);
4441                 return -1;
4442         }
4443
4444         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4445                         sess_list) {
4446                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4447
4448                 spin_lock(&sess->conn_lock);
4449                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4450                     atomic_read(&sess->session_logout) ||
4451                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4452                         spin_unlock(&sess->conn_lock);
4453                         continue;
4454                 }
4455                 atomic_set(&sess->session_reinstatement, 1);
4456                 spin_unlock(&sess->conn_lock);
4457                 spin_unlock_bh(&se_tpg->session_lock);
4458
4459                 iscsit_free_session(sess);
4460                 spin_lock_bh(&se_tpg->session_lock);
4461
4462                 session_count++;
4463         }
4464         spin_unlock_bh(&se_tpg->session_lock);
4465
4466         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4467                         " Group: %hu\n", session_count, tpg->tpgt);
4468         return 0;
4469 }
4470
4471 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4472 MODULE_VERSION("4.1.x");
4473 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4474 MODULE_LICENSE("GPL");
4475
4476 module_init(iscsi_target_init_module);
4477 module_exit(iscsi_target_cleanup_module);