drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <linux/idr.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/iscsi_proto.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_fabric.h>
  33 #include <target/target_core_configfs.h>
  34
  35 #include "iscsi_target_core.h"
  36 #include "iscsi_target_parameters.h"
  37 #include "iscsi_target_seq_pdu_list.h"
  38 #include "iscsi_target_tq.h"
  39 #include "iscsi_target_configfs.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include "iscsi_target_stat.h"
  51
  52 #include <target/iscsi/iscsi_transport.h>
  53
  54 static LIST_HEAD(g_tiqn_list);
  55 static LIST_HEAD(g_np_list);
  56 static DEFINE_SPINLOCK(tiqn_lock);
  57 static DEFINE_SPINLOCK(np_lock);
  58
  59 static struct idr tiqn_idr;
  60 struct idr sess_idr;
  61 struct mutex auth_id_lock;
  62 spinlock_t sess_idr_lock;
  63
  64 struct iscsit_global *iscsit_global;
  65
  66 struct kmem_cache *lio_cmd_cache;
  67 struct kmem_cache *lio_qr_cache;
  68 struct kmem_cache *lio_dr_cache;
  69 struct kmem_cache *lio_ooo_cache;
  70 struct kmem_cache *lio_r2t_cache;
  71
  72 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  73                         struct iscsi_scsi_req *, u32);
  74
  75 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  76 {
  77         struct iscsi_tiqn *tiqn = NULL;
  78
  79         spin_lock(&tiqn_lock);
  80         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  81                 if (!strcmp(tiqn->tiqn, buf)) {
  82
  83                         spin_lock(&tiqn->tiqn_state_lock);
  84                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  85                                 tiqn->tiqn_access_count++;
  86                                 spin_unlock(&tiqn->tiqn_state_lock);
  87                                 spin_unlock(&tiqn_lock);
  88                                 return tiqn;
  89                         }
  90                         spin_unlock(&tiqn->tiqn_state_lock);
  91                 }
  92         }
  93         spin_unlock(&tiqn_lock);
  94
  95         return NULL;
  96 }
  97
  98 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  99 {
 100         spin_lock(&tiqn->tiqn_state_lock);
 101         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 102                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 103                 spin_unlock(&tiqn->tiqn_state_lock);
 104                 return 0;
 105         }
 106         spin_unlock(&tiqn->tiqn_state_lock);
 107
 108         return -1;
 109 }
 110
 111 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 112 {
 113         spin_lock(&tiqn->tiqn_state_lock);
 114         tiqn->tiqn_access_count--;
 115         spin_unlock(&tiqn->tiqn_state_lock);
 116 }
 117
 118 /*
 119  * Note that IQN formatting is expected to be done in userspace, and
 120  * no explict IQN format checks are done here.
 121  */
 122 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 123 {
 124         struct iscsi_tiqn *tiqn = NULL;
 125         int ret;
 126
 127         if (strlen(buf) >= ISCSI_IQN_LEN) {
 128                 pr_err("Target IQN exceeds %d bytes\n",
 129                                 ISCSI_IQN_LEN);
 130                 return ERR_PTR(-EINVAL);
 131         }
 132
 133         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 134         if (!tiqn) {
 135                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 136                 return ERR_PTR(-ENOMEM);
 137         }
 138
 139         sprintf(tiqn->tiqn, "%s", buf);
 140         INIT_LIST_HEAD(&tiqn->tiqn_list);
 141         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 142         spin_lock_init(&tiqn->tiqn_state_lock);
 143         spin_lock_init(&tiqn->tiqn_tpg_lock);
 144         spin_lock_init(&tiqn->sess_err_stats.lock);
 145         spin_lock_init(&tiqn->login_stats.lock);
 146         spin_lock_init(&tiqn->logout_stats.lock);
 147
 148         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 149
 150         idr_preload(GFP_KERNEL);
 151         spin_lock(&tiqn_lock);
 152
 153         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 154         if (ret < 0) {
 155                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 156                 spin_unlock(&tiqn_lock);
 157                 idr_preload_end();
 158                 kfree(tiqn);
 159                 return ERR_PTR(ret);
 160         }
 161         tiqn->tiqn_index = ret;
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163
 164         spin_unlock(&tiqn_lock);
 165         idr_preload_end();
 166
 167         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 168
 169         return tiqn;
 170
 171 }
 172
 173 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 174 {
 175         /*
 176          * Wait for accesses to said struct iscsi_tiqn to end.
 177          */
 178         spin_lock(&tiqn->tiqn_state_lock);
 179         while (tiqn->tiqn_access_count != 0) {
 180                 spin_unlock(&tiqn->tiqn_state_lock);
 181                 msleep(10);
 182                 spin_lock(&tiqn->tiqn_state_lock);
 183         }
 184         spin_unlock(&tiqn->tiqn_state_lock);
 185 }
 186
 187 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 188 {
 189         /*
 190          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 191          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 192          * attempts to access this struct iscsi_tiqn will fail from both transport
 193          * fabric and control code paths.
 194          */
 195         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 196                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 197                 return;
 198         }
 199
 200         iscsit_wait_for_tiqn(tiqn);
 201
 202         spin_lock(&tiqn_lock);
 203         list_del(&tiqn->tiqn_list);
 204         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 205         spin_unlock(&tiqn_lock);
 206
 207         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 208                         tiqn->tiqn);
 209         kfree(tiqn);
 210 }
 211
 212 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 213 {
 214         int ret;
 215         /*
 216          * Determine if the network portal is accepting storage traffic.
 217          */
 218         spin_lock_bh(&np->np_thread_lock);
 219         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 220                 spin_unlock_bh(&np->np_thread_lock);
 221                 return -1;
 222         }
 223         if (np->np_login_tpg) {
 224                 pr_err("np->np_login_tpg() is not NULL!\n");
 225                 spin_unlock_bh(&np->np_thread_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&np->np_thread_lock);
 229         /*
 230          * Determine if the portal group is accepting storage traffic.
 231          */
 232         spin_lock_bh(&tpg->tpg_state_lock);
 233         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 234                 spin_unlock_bh(&tpg->tpg_state_lock);
 235                 return -1;
 236         }
 237         spin_unlock_bh(&tpg->tpg_state_lock);
 238
 239         /*
 240          * Here we serialize access across the TIQN+TPG Tuple.
 241          */
 242         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 243         if ((ret != 0) || signal_pending(current))
 244                 return -1;
 245
 246         spin_lock_bh(&np->np_thread_lock);
 247         np->np_login_tpg = tpg;
 248         spin_unlock_bh(&np->np_thread_lock);
 249
 250         return 0;
 251 }
 252
 253 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 254 {
 255         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 256
 257         spin_lock_bh(&np->np_thread_lock);
 258         np->np_login_tpg = NULL;
 259         spin_unlock_bh(&np->np_thread_lock);
 260
 261         mutex_unlock(&tpg->np_login_lock);
 262
 263         if (tiqn)
 264                 iscsit_put_tiqn_for_login(tiqn);
 265
 266         return 0;
 267 }
 268
 269 bool iscsit_check_np_match(
 270         struct __kernel_sockaddr_storage *sockaddr,
 271         struct iscsi_np *np,
 272         int network_transport)
 273 {
 274         struct sockaddr_in *sock_in, *sock_in_e;
 275         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 276         bool ip_match = false;
 277         u16 port;
 278
 279         if (sockaddr->ss_family == AF_INET6) {
 280                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 281                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 282
 283                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 284                             &sock_in6_e->sin6_addr.in6_u,
 285                             sizeof(struct in6_addr)))
 286                         ip_match = true;
 287
 288                 port = ntohs(sock_in6->sin6_port);
 289         } else {
 290                 sock_in = (struct sockaddr_in *)sockaddr;
 291                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 292
 293                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 294                         ip_match = true;
 295
 296                 port = ntohs(sock_in->sin_port);
 297         }
 298
 299         if ((ip_match == true) && (np->np_port == port) &&
 300             (np->np_network_transport == network_transport))
 301                 return true;
 302
 303         return false;
 304 }
 305
 306 static struct iscsi_np *iscsit_get_np(
 307         struct __kernel_sockaddr_storage *sockaddr,
 308         int network_transport)
 309 {
 310         struct iscsi_np *np;
 311         bool match;
 312
 313         spin_lock_bh(&np_lock);
 314         list_for_each_entry(np, &g_np_list, np_list) {
 315                 spin_lock(&np->np_thread_lock);
 316                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 317                         spin_unlock(&np->np_thread_lock);
 318                         continue;
 319                 }
 320
 321                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 322                 if (match == true) {
 323                         /*
 324                          * Increment the np_exports reference count now to
 325                          * prevent iscsit_del_np() below from being called
 326                          * while iscsi_tpg_add_network_portal() is called.
 327                          */
 328                         np->np_exports++;
 329                         spin_unlock(&np->np_thread_lock);
 330                         spin_unlock_bh(&np_lock);
 331                         return np;
 332                 }
 333                 spin_unlock(&np->np_thread_lock);
 334         }
 335         spin_unlock_bh(&np_lock);
 336
 337         return NULL;
 338 }
 339
 340 struct iscsi_np *iscsit_add_np(
 341         struct __kernel_sockaddr_storage *sockaddr,
 342         char *ip_str,
 343         int network_transport)
 344 {
 345         struct sockaddr_in *sock_in;
 346         struct sockaddr_in6 *sock_in6;
 347         struct iscsi_np *np;
 348         int ret;
 349         /*
 350          * Locate the existing struct iscsi_np if already active..
 351          */
 352         np = iscsit_get_np(sockaddr, network_transport);
 353         if (np)
 354                 return np;
 355
 356         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 357         if (!np) {
 358                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 359                 return ERR_PTR(-ENOMEM);
 360         }
 361
 362         np->np_flags |= NPF_IP_NETWORK;
 363         if (sockaddr->ss_family == AF_INET6) {
 364                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 365                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 366                 np->np_port = ntohs(sock_in6->sin6_port);
 367         } else {
 368                 sock_in = (struct sockaddr_in *)sockaddr;
 369                 sprintf(np->np_ip, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in->sin_port);
 371         }
 372
 373         np->np_network_transport = network_transport;
 374         spin_lock_init(&np->np_thread_lock);
 375         init_completion(&np->np_restart_comp);
 376         INIT_LIST_HEAD(&np->np_list);
 377
 378         ret = iscsi_target_setup_login_socket(np, sockaddr);
 379         if (ret != 0) {
 380                 kfree(np);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 return ERR_PTR(ret);
 390         }
 391         /*
 392          * Increment the np_exports reference count now to prevent
 393          * iscsit_del_np() below from being run while a new call to
 394          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 395          * active.  We don't need to hold np->np_thread_lock at this
 396          * point because iscsi_np has not been added to g_np_list yet.
 397          */
 398         np->np_exports = 1;
 399
 400         spin_lock_bh(&np_lock);
 401         list_add_tail(&np->np_list, &g_np_list);
 402         spin_unlock_bh(&np_lock);
 403
 404         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 405                 np->np_ip, np->np_port, np->np_transport->name);
 406
 407         return np;
 408 }
 409
 410 int iscsit_reset_np_thread(
 411         struct iscsi_np *np,
 412         struct iscsi_tpg_np *tpg_np,
 413         struct iscsi_portal_group *tpg)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (tpg && tpg_np) {
 417                 /*
 418                  * The reset operation need only be performed when the
 419                  * passed struct iscsi_portal_group has a login in progress
 420                  * to one of the network portals.
 421                  */
 422                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 423                         spin_unlock_bh(&np->np_thread_lock);
 424                         return 0;
 425                 }
 426         }
 427         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 return 0;
 430         }
 431         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 432
 433         if (np->np_thread) {
 434                 spin_unlock_bh(&np->np_thread_lock);
 435                 send_sig(SIGINT, np->np_thread, 1);
 436                 wait_for_completion(&np->np_restart_comp);
 437                 spin_lock_bh(&np->np_thread_lock);
 438         }
 439         spin_unlock_bh(&np->np_thread_lock);
 440
 441         return 0;
 442 }
 443
 444 static void iscsit_free_np(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448 }
 449
 450 int iscsit_del_np(struct iscsi_np *np)
 451 {
 452         spin_lock_bh(&np->np_thread_lock);
 453         np->np_exports--;
 454         if (np->np_exports) {
 455                 spin_unlock_bh(&np->np_thread_lock);
 456                 return 0;
 457         }
 458         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 459         spin_unlock_bh(&np->np_thread_lock);
 460
 461         if (np->np_thread) {
 462                 /*
 463                  * We need to send the signal to wakeup Linux/Net
 464                  * which may be sleeping in sock_accept()..
 465                  */
 466                 send_sig(SIGINT, np->np_thread, 1);
 467                 kthread_stop(np->np_thread);
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486
 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 488 {
 489         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 490         return 0;
 491 }
 492
 493 static struct iscsit_transport iscsi_target_transport = {
 494         .name                   = "iSCSI/TCP",
 495         .transport_type         = ISCSI_TCP,
 496         .owner                  = NULL,
 497         .iscsit_setup_np        = iscsit_setup_np,
 498         .iscsit_accept_np       = iscsit_accept_np,
 499         .iscsit_free_np         = iscsit_free_np,
 500         .iscsit_alloc_cmd       = iscsit_alloc_cmd,
 501         .iscsit_get_login_rx    = iscsit_get_login_rx,
 502         .iscsit_put_login_tx    = iscsit_put_login_tx,
 503         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 504         .iscsit_immediate_queue = iscsit_immediate_queue,
 505         .iscsit_response_queue  = iscsit_response_queue,
 506         .iscsit_queue_data_in   = iscsit_queue_rsp,
 507         .iscsit_queue_status    = iscsit_queue_rsp,
 508 };
 509
 510 static int __init iscsi_target_init_module(void)
 511 {
 512         int ret = 0;
 513
 514         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 515
 516         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 517         if (!iscsit_global) {
 518                 pr_err("Unable to allocate memory for iscsit_global\n");
 519                 return -1;
 520         }
 521         mutex_init(&auth_id_lock);
 522         spin_lock_init(&sess_idr_lock);
 523         idr_init(&tiqn_idr);
 524         idr_init(&sess_idr);
 525
 526         ret = iscsi_target_register_configfs();
 527         if (ret < 0)
 528                 goto out;
 529
 530         ret = iscsi_thread_set_init();
 531         if (ret < 0)
 532                 goto configfs_out;
 533
 534         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 535                         TARGET_THREAD_SET_COUNT) {
 536                 pr_err("iscsi_allocate_thread_sets() returned"
 537                         " unexpected value!\n");
 538                 goto ts_out1;
 539         }
 540
 541         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 542                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 543                         0, NULL);
 544         if (!lio_cmd_cache) {
 545                 pr_err("Unable to kmem_cache_create() for"
 546                                 " lio_cmd_cache\n");
 547                 goto ts_out2;
 548         }
 549
 550         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 551                         sizeof(struct iscsi_queue_req),
 552                         __alignof__(struct iscsi_queue_req), 0, NULL);
 553         if (!lio_qr_cache) {
 554                 pr_err("nable to kmem_cache_create() for"
 555                                 " lio_qr_cache\n");
 556                 goto cmd_out;
 557         }
 558
 559         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 560                         sizeof(struct iscsi_datain_req),
 561                         __alignof__(struct iscsi_datain_req), 0, NULL);
 562         if (!lio_dr_cache) {
 563                 pr_err("Unable to kmem_cache_create() for"
 564                                 " lio_dr_cache\n");
 565                 goto qr_out;
 566         }
 567
 568         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 569                         sizeof(struct iscsi_ooo_cmdsn),
 570                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 571         if (!lio_ooo_cache) {
 572                 pr_err("Unable to kmem_cache_create() for"
 573                                 " lio_ooo_cache\n");
 574                 goto dr_out;
 575         }
 576
 577         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 578                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 579                         0, NULL);
 580         if (!lio_r2t_cache) {
 581                 pr_err("Unable to kmem_cache_create() for"
 582                                 " lio_r2t_cache\n");
 583                 goto ooo_out;
 584         }
 585
 586         iscsit_register_transport(&iscsi_target_transport);
 587
 588         if (iscsit_load_discovery_tpg() < 0)
 589                 goto r2t_out;
 590
 591         return ret;
 592 r2t_out:
 593         kmem_cache_destroy(lio_r2t_cache);
 594 ooo_out:
 595         kmem_cache_destroy(lio_ooo_cache);
 596 dr_out:
 597         kmem_cache_destroy(lio_dr_cache);
 598 qr_out:
 599         kmem_cache_destroy(lio_qr_cache);
 600 cmd_out:
 601         kmem_cache_destroy(lio_cmd_cache);
 602 ts_out2:
 603         iscsi_deallocate_thread_sets();
 604 ts_out1:
 605         iscsi_thread_set_free();
 606 configfs_out:
 607         iscsi_target_deregister_configfs();
 608 out:
 609         kfree(iscsit_global);
 610         return -ENOMEM;
 611 }
 612
 613 static void __exit iscsi_target_cleanup_module(void)
 614 {
 615         iscsi_deallocate_thread_sets();
 616         iscsi_thread_set_free();
 617         iscsit_release_discovery_tpg();
 618         iscsit_unregister_transport(&iscsi_target_transport);
 619         kmem_cache_destroy(lio_cmd_cache);
 620         kmem_cache_destroy(lio_qr_cache);
 621         kmem_cache_destroy(lio_dr_cache);
 622         kmem_cache_destroy(lio_ooo_cache);
 623         kmem_cache_destroy(lio_r2t_cache);
 624
 625         iscsi_target_deregister_configfs();
 626
 627         kfree(iscsit_global);
 628 }
 629
 630 static int iscsit_add_reject(
 631         u8 reason,
 632         int fail_conn,
 633         unsigned char *buf,
 634         struct iscsi_conn *conn)
 635 {
 636         struct iscsi_cmd *cmd;
 637         struct iscsi_reject *hdr;
 638         int ret;
 639
 640         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 641         if (!cmd)
 642                 return -1;
 643
 644         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 645         if (fail_conn)
 646                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 647
 648         hdr     = (struct iscsi_reject *) cmd->pdu;
 649         hdr->reason = reason;
 650
 651         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 652         if (!cmd->buf_ptr) {
 653                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 654                 iscsit_free_cmd(cmd, false);
 655                 return -1;
 656         }
 657
 658         spin_lock_bh(&conn->cmd_lock);
 659         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 660         spin_unlock_bh(&conn->cmd_lock);
 661
 662         cmd->i_state = ISTATE_SEND_REJECT;
 663         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 664
 665         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 666         if (ret != 0)
 667                 return -1;
 668
 669         return (!fail_conn) ? 0 : -1;
 670 }
 671
 672 int iscsit_add_reject_from_cmd(
 673         u8 reason,
 674         int fail_conn,
 675         int add_to_conn,
 676         unsigned char *buf,
 677         struct iscsi_cmd *cmd)
 678 {
 679         struct iscsi_conn *conn;
 680         struct iscsi_reject *hdr;
 681         int ret;
 682
 683         if (!cmd->conn) {
 684                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 685                                 cmd->init_task_tag);
 686                 return -1;
 687         }
 688         conn = cmd->conn;
 689
 690         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 691         if (fail_conn)
 692                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 693
 694         hdr     = (struct iscsi_reject *) cmd->pdu;
 695         hdr->reason = reason;
 696
 697         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 698         if (!cmd->buf_ptr) {
 699                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 700                 iscsit_free_cmd(cmd, false);
 701                 return -1;
 702         }
 703
 704         if (add_to_conn) {
 705                 spin_lock_bh(&conn->cmd_lock);
 706                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 707                 spin_unlock_bh(&conn->cmd_lock);
 708         }
 709
 710         cmd->i_state = ISTATE_SEND_REJECT;
 711         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 712
 713         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 714         /*
 715          * Perform the kref_put now if se_cmd has already been setup by
 716          * scsit_setup_scsi_cmd()
 717          */
 718         if (cmd->se_cmd.se_tfo != NULL) {
 719                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 720                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 721         }
 722         if (ret != 0)
 723                 return -1;
 724
 725         return (!fail_conn) ? 0 : -1;
 726 }
 727 EXPORT_SYMBOL(iscsit_add_reject_from_cmd);
 728
 729 /*
 730  * Map some portion of the allocated scatterlist to an iovec, suitable for
 731  * kernel sockets to copy data in/out.
 732  */
 733 static int iscsit_map_iovec(
 734         struct iscsi_cmd *cmd,
 735         struct kvec *iov,
 736         u32 data_offset,
 737         u32 data_length)
 738 {
 739         u32 i = 0;
 740         struct scatterlist *sg;
 741         unsigned int page_off;
 742
 743         /*
 744          * We know each entry in t_data_sg contains a page.
 745          */
 746         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 747         page_off = (data_offset % PAGE_SIZE);
 748
 749         cmd->first_data_sg = sg;
 750         cmd->first_data_sg_off = page_off;
 751
 752         while (data_length) {
 753                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 754
 755                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 756                 iov[i].iov_len = cur_len;
 757
 758                 data_length -= cur_len;
 759                 page_off = 0;
 760                 sg = sg_next(sg);
 761                 i++;
 762         }
 763
 764         cmd->kmapped_nents = i;
 765
 766         return i;
 767 }
 768
 769 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 770 {
 771         u32 i;
 772         struct scatterlist *sg;
 773
 774         sg = cmd->first_data_sg;
 775
 776         for (i = 0; i < cmd->kmapped_nents; i++)
 777                 kunmap(sg_page(&sg[i]));
 778 }
 779
 780 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 781 {
 782         struct iscsi_cmd *cmd;
 783
 784         conn->exp_statsn = exp_statsn;
 785
 786         if (conn->sess->sess_ops->RDMAExtensions)
 787                 return;
 788
 789         spin_lock_bh(&conn->cmd_lock);
 790         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 791                 spin_lock(&cmd->istate_lock);
 792                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 793                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 794                         cmd->i_state = ISTATE_REMOVE;
 795                         spin_unlock(&cmd->istate_lock);
 796                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 797                                                 cmd->i_state);
 798                         continue;
 799                 }
 800                 spin_unlock(&cmd->istate_lock);
 801         }
 802         spin_unlock_bh(&conn->cmd_lock);
 803 }
 804
 805 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 806 {
 807         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 808
 809         iov_count += ISCSI_IOV_DATA_BUFFER;
 810
 811         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 812         if (!cmd->iov_data) {
 813                 pr_err("Unable to allocate cmd->iov_data\n");
 814                 return -ENOMEM;
 815         }
 816
 817         cmd->orig_iov_data_count = iov_count;
 818         return 0;
 819 }
 820
 821 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 822                           unsigned char *buf)
 823 {
 824         int data_direction, payload_length;
 825         struct iscsi_scsi_req *hdr;
 826         int iscsi_task_attr;
 827         int sam_task_attr;
 828
 829         spin_lock_bh(&conn->sess->session_stats_lock);
 830         conn->sess->cmd_pdus++;
 831         if (conn->sess->se_sess->se_node_acl) {
 832                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 833                 conn->sess->se_sess->se_node_acl->num_cmds++;
 834                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 835         }
 836         spin_unlock_bh(&conn->sess->session_stats_lock);
 837
 838         hdr                     = (struct iscsi_scsi_req *) buf;
 839         payload_length          = ntoh24(hdr->dlength);
 840
 841         /* FIXME; Add checks for AdditionalHeaderSegment */
 842
 843         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 844             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 845                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 846                                 " not set. Bad iSCSI Initiator.\n");
 847                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 848                                 1, 1, buf, cmd);
 849         }
 850
 851         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 852              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 853                 /*
 854                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 855                  * that adds support for RESERVE/RELEASE.  There is a bug
 856                  * add with this new functionality that sets R/W bits when
 857                  * neither CDB carries any READ or WRITE datapayloads.
 858                  */
 859                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 860                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 861                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 862                         goto done;
 863                 }
 864
 865                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 866                         " set when Expected Data Transfer Length is 0 for"
 867                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 868                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 869                                 1, 1, buf, cmd);
 870         }
 871 done:
 872
 873         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 874             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 875                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 876                         " MUST be set if Expected Data Transfer Length is not 0."
 877                         " Bad iSCSI Initiator\n");
 878                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 879                                 1, 1, buf, cmd);
 880         }
 881
 882         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 883             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 884                 pr_err("Bidirectional operations not supported!\n");
 885                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 886                                 1, 1, buf, cmd);
 887         }
 888
 889         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 890                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 891                                 " Scsi Command PDU.\n");
 892                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 893                                 1, 1, buf, cmd);
 894         }
 895
 896         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 897                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 898                         " protocol error.\n", payload_length);
 899                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 900                                 1, 1, buf, cmd);
 901         }
 902
 903         if ((be32_to_cpu(hdr->data_length )== payload_length) &&
 904             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 905                 pr_err("Expected Data Transfer Length and Length of"
 906                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 907                         " bit is not set protocol error\n");
 908                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 909                                 1, 1, buf, cmd);
 910         }
 911
 912         if (payload_length > be32_to_cpu(hdr->data_length)) {
 913                 pr_err("DataSegmentLength: %u is greater than"
 914                         " EDTL: %u, protocol error.\n", payload_length,
 915                                 hdr->data_length);
 916                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 917                                 1, 1, buf, cmd);
 918         }
 919
 920         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 921                 pr_err("DataSegmentLength: %u is greater than"
 922                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 923                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 924                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
 925                                 1, 1, buf, cmd);
 926         }
 927
 928         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 929                 pr_err("DataSegmentLength: %u is greater than"
 930                         " FirstBurstLength: %u, protocol error.\n",
 931                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 932                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
 933                                 1, 1, buf, cmd);
 934         }
 935
 936         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 937                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 938                           DMA_NONE;
 939
 940         cmd->data_direction = data_direction;
 941         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 942         /*
 943          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 944          */
 945         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 946             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 947                 sam_task_attr = MSG_SIMPLE_TAG;
 948         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 949                 sam_task_attr = MSG_ORDERED_TAG;
 950         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 951                 sam_task_attr = MSG_HEAD_TAG;
 952         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 953                 sam_task_attr = MSG_ACA_TAG;
 954         else {
 955                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 956                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 957                 sam_task_attr = MSG_SIMPLE_TAG;
 958         }
 959
 960         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 961         cmd->i_state            = ISTATE_NEW_CMD;
 962         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 963         cmd->immediate_data     = (payload_length) ? 1 : 0;
 964         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 965                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 966         if (cmd->unsolicited_data)
 967                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 968
 969         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 970         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 971                 spin_lock_bh(&conn->sess->ttt_lock);
 972                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 973                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 974                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 975                 spin_unlock_bh(&conn->sess->ttt_lock);
 976         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 977                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 978         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 979         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 980         cmd->first_burst_len    = payload_length;
 981
 982         if (!conn->sess->sess_ops->RDMAExtensions &&
 983              cmd->data_direction == DMA_FROM_DEVICE) {
 984                 struct iscsi_datain_req *dr;
 985
 986                 dr = iscsit_allocate_datain_req();
 987                 if (!dr)
 988                         return iscsit_add_reject_from_cmd(
 989                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 990                                         1, 1, buf, cmd);
 991
 992                 iscsit_attach_datain_req(cmd, dr);
 993         }
 994
 995         /*
 996          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 997          */
 998         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 999                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1000                         cmd->data_direction, sam_task_attr,
1001                         cmd->sense_buffer + 2);
1002
1003         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1004                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1005                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1006                 conn->cid);
1007
1008         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1009
1010         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1011                                                      scsilun_to_int(&hdr->lun));
1012         if (cmd->sense_reason)
1013                 goto attach_cmd;
1014
1015         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1016         if (cmd->sense_reason) {
1017                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1018                         return iscsit_add_reject_from_cmd(
1019                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1020                                         1, 1, buf, cmd);
1021                 }
1022
1023                 goto attach_cmd;
1024         }
1025
1026         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1027                 return iscsit_add_reject_from_cmd(
1028                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1029                         1, 1, buf, cmd);
1030         }
1031
1032 attach_cmd:
1033         spin_lock_bh(&conn->cmd_lock);
1034         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1035         spin_unlock_bh(&conn->cmd_lock);
1036         /*
1037          * Check if we need to delay processing because of ALUA
1038          * Active/NonOptimized primary access state..
1039          */
1040         core_alua_check_nonop_delay(&cmd->se_cmd);
1041
1042         return 0;
1043 }
1044 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1045
1046 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1047 {
1048         iscsit_set_dataout_sequence_values(cmd);
1049
1050         spin_lock_bh(&cmd->dataout_timeout_lock);
1051         iscsit_start_dataout_timer(cmd, cmd->conn);
1052         spin_unlock_bh(&cmd->dataout_timeout_lock);
1053 }
1054 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1055
1056 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1057                             struct iscsi_scsi_req *hdr)
1058 {
1059         int cmdsn_ret = 0;
1060         /*
1061          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1062          * the Immediate Bit is not set, and no Immediate
1063          * Data is attached.
1064          *
1065          * A PDU/CmdSN carrying Immediate Data can only
1066          * be processed after the DataCRC has passed.
1067          * If the DataCRC fails, the CmdSN MUST NOT
1068          * be acknowledged. (See below)
1069          */
1070         if (!cmd->immediate_data) {
1071                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1072                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1073                         if (!cmd->sense_reason)
1074                                 return 0;
1075
1076                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1077                         return 0;
1078                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1079                         return iscsit_add_reject_from_cmd(
1080                                 ISCSI_REASON_PROTOCOL_ERROR,
1081                                 1, 0, (unsigned char *)hdr, cmd);
1082                 }
1083         }
1084
1085         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1086
1087         /*
1088          * If no Immediate Data is attached, it's OK to return now.
1089          */
1090         if (!cmd->immediate_data) {
1091                 if (!cmd->sense_reason && cmd->unsolicited_data)
1092                         iscsit_set_unsoliticed_dataout(cmd);
1093                 if (!cmd->sense_reason)
1094                         return 0;
1095
1096                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1097                 return 0;
1098         }
1099
1100         /*
1101          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1102          * execution.  These exceptions are processed in CmdSN order using
1103          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1104          */
1105         if (cmd->sense_reason) {
1106                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1107                 return 1;
1108         }
1109         /*
1110          * Call directly into transport_generic_new_cmd() to perform
1111          * the backend memory allocation.
1112          */
1113         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1114         if (cmd->sense_reason) {
1115                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1116                 return 1;
1117         }
1118
1119         return 0;
1120 }
1121 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1122
1123 static int
1124 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1125                           bool dump_payload)
1126 {
1127         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1128         /*
1129          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1130          */
1131         if (dump_payload == true)
1132                 goto after_immediate_data;
1133
1134         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1135                                         cmd->first_burst_len);
1136 after_immediate_data:
1137         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1138                 /*
1139                  * A PDU/CmdSN carrying Immediate Data passed
1140                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1141                  * Immediate Bit is not set.
1142                  */
1143                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd, hdr->cmdsn);
1144
1145                 if (cmd->sense_reason) {
1146                         if (iscsit_dump_data_payload(cmd->conn,
1147                                         cmd->first_burst_len, 1) < 0)
1148                                 return -1;
1149                 } else if (cmd->unsolicited_data)
1150                         iscsit_set_unsoliticed_dataout(cmd);
1151
1152                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1153                         return iscsit_add_reject_from_cmd(
1154                                 ISCSI_REASON_PROTOCOL_ERROR,
1155                                 1, 0, (unsigned char *)hdr, cmd);
1156
1157         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1158                 /*
1159                  * Immediate Data failed DataCRC and ERL>=1,
1160                  * silently drop this PDU and let the initiator
1161                  * plug the CmdSN gap.
1162                  *
1163                  * FIXME: Send Unsolicited NOPIN with reserved
1164                  * TTT here to help the initiator figure out
1165                  * the missing CmdSN, although they should be
1166                  * intelligent enough to determine the missing
1167                  * CmdSN and issue a retry to plug the sequence.
1168                  */
1169                 cmd->i_state = ISTATE_REMOVE;
1170                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1171         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1172                 return -1;
1173
1174         return 0;
1175 }
1176
1177 static int
1178 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1179                            unsigned char *buf)
1180 {
1181         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1182         int rc, immed_data;
1183         bool dump_payload = false;
1184
1185         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1186         if (rc < 0)
1187                 return rc;
1188         /*
1189          * Allocation iovecs needed for struct socket operations for
1190          * traditional iSCSI block I/O.
1191          */
1192         if (iscsit_allocate_iovecs(cmd) < 0) {
1193                 return iscsit_add_reject_from_cmd(
1194                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1195                                 1, 0, buf, cmd);
1196         }
1197         immed_data = cmd->immediate_data;
1198
1199         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1200         if (rc < 0)
1201                 return rc;
1202         else if (rc > 0)
1203                 dump_payload = true;
1204
1205         if (!immed_data)
1206                 return 0;
1207
1208         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1209 }
1210
1211 static u32 iscsit_do_crypto_hash_sg(
1212         struct hash_desc *hash,
1213         struct iscsi_cmd *cmd,
1214         u32 data_offset,
1215         u32 data_length,
1216         u32 padding,
1217         u8 *pad_bytes)
1218 {
1219         u32 data_crc;
1220         u32 i;
1221         struct scatterlist *sg;
1222         unsigned int page_off;
1223
1224         crypto_hash_init(hash);
1225
1226         sg = cmd->first_data_sg;
1227         page_off = cmd->first_data_sg_off;
1228
1229         i = 0;
1230         while (data_length) {
1231                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1232
1233                 crypto_hash_update(hash, &sg[i], cur_len);
1234
1235                 data_length -= cur_len;
1236                 page_off = 0;
1237                 i++;
1238         }
1239
1240         if (padding) {
1241                 struct scatterlist pad_sg;
1242
1243                 sg_init_one(&pad_sg, pad_bytes, padding);
1244                 crypto_hash_update(hash, &pad_sg, padding);
1245         }
1246         crypto_hash_final(hash, (u8 *) &data_crc);
1247
1248         return data_crc;
1249 }
1250
1251 static void iscsit_do_crypto_hash_buf(
1252         struct hash_desc *hash,
1253         const void *buf,
1254         u32 payload_length,
1255         u32 padding,
1256         u8 *pad_bytes,
1257         u8 *data_crc)
1258 {
1259         struct scatterlist sg;
1260
1261         crypto_hash_init(hash);
1262
1263         sg_init_one(&sg, buf, payload_length);
1264         crypto_hash_update(hash, &sg, payload_length);
1265
1266         if (padding) {
1267                 sg_init_one(&sg, pad_bytes, padding);
1268                 crypto_hash_update(hash, &sg, padding);
1269         }
1270         crypto_hash_final(hash, data_crc);
1271 }
1272
1273 int
1274 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1275                           struct iscsi_cmd **out_cmd)
1276 {
1277         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1278         struct iscsi_cmd *cmd = NULL;
1279         struct se_cmd *se_cmd;
1280         u32 payload_length = ntoh24(hdr->dlength);
1281         int rc;
1282
1283         if (!payload_length) {
1284                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1285                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1286                                         buf, conn);
1287         }
1288
1289         /* iSCSI write */
1290         spin_lock_bh(&conn->sess->session_stats_lock);
1291         conn->sess->rx_data_octets += payload_length;
1292         if (conn->sess->se_sess->se_node_acl) {
1293                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1294                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1295                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1296         }
1297         spin_unlock_bh(&conn->sess->session_stats_lock);
1298
1299         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1300                 pr_err("DataSegmentLength: %u is greater than"
1301                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1302                         conn->conn_ops->MaxXmitDataSegmentLength);
1303                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1304                                         buf, conn);
1305         }
1306
1307         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1308                         payload_length);
1309         if (!cmd)
1310                 return 0;
1311
1312         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1313                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1314                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1315                 payload_length, conn->cid);
1316
1317         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1318                 pr_err("Command ITT: 0x%08x received DataOUT after"
1319                         " last DataOUT received, dumping payload\n",
1320                         cmd->init_task_tag);
1321                 return iscsit_dump_data_payload(conn, payload_length, 1);
1322         }
1323
1324         if (cmd->data_direction != DMA_TO_DEVICE) {
1325                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1326                         " NON-WRITE command.\n", cmd->init_task_tag);
1327                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1328                                 1, 0, buf, cmd);
1329         }
1330         se_cmd = &cmd->se_cmd;
1331         iscsit_mod_dataout_timer(cmd);
1332
1333         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1334                 pr_err("DataOut Offset: %u, Length %u greater than"
1335                         " iSCSI Command EDTL %u, protocol error.\n",
1336                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1337                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1338                                 1, 0, buf, cmd);
1339         }
1340
1341         if (cmd->unsolicited_data) {
1342                 int dump_unsolicited_data = 0;
1343
1344                 if (conn->sess->sess_ops->InitialR2T) {
1345                         pr_err("Received unexpected unsolicited data"
1346                                 " while InitialR2T=Yes, protocol error.\n");
1347                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1348                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1349                         return -1;
1350                 }
1351                 /*
1352                  * Special case for dealing with Unsolicited DataOUT
1353                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1354                  * failures;
1355                  */
1356
1357                 /* Something's amiss if we're not in WRITE_PENDING state... */
1358                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1359                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1360                         dump_unsolicited_data = 1;
1361
1362                 if (dump_unsolicited_data) {
1363                         /*
1364                          * Check if a delayed TASK_ABORTED status needs to
1365                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1366                          * received with the unsolicitied data out.
1367                          */
1368                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1369                                 iscsit_stop_dataout_timer(cmd);
1370
1371                         transport_check_aborted_status(se_cmd,
1372                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1373                         return iscsit_dump_data_payload(conn, payload_length, 1);
1374                 }
1375         } else {
1376                 /*
1377                  * For the normal solicited data path:
1378                  *
1379                  * Check for a delayed TASK_ABORTED status and dump any
1380                  * incoming data out payload if one exists.  Also, when the
1381                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1382                  * data out sequence, we decrement outstanding_r2ts.  Once
1383                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1384                  * TASK_ABORTED status.
1385                  */
1386                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1387                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1388                                 if (--cmd->outstanding_r2ts < 1) {
1389                                         iscsit_stop_dataout_timer(cmd);
1390                                         transport_check_aborted_status(
1391                                                         se_cmd, 1);
1392                                 }
1393
1394                         return iscsit_dump_data_payload(conn, payload_length, 1);
1395                 }
1396         }
1397         /*
1398          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1399          * within-command recovery checks before receiving the payload.
1400          */
1401         rc = iscsit_check_pre_dataout(cmd, buf);
1402         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1403                 return 0;
1404         else if (rc == DATAOUT_CANNOT_RECOVER)
1405                 return -1;
1406
1407         *out_cmd = cmd;
1408         return 0;
1409 }
1410 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1411
1412 static int
1413 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1414                    struct iscsi_data *hdr)
1415 {
1416         struct kvec *iov;
1417         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1418         u32 payload_length = ntoh24(hdr->dlength);
1419         int iov_ret, data_crc_failed = 0;
1420
1421         rx_size += payload_length;
1422         iov = &cmd->iov_data[0];
1423
1424         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1425                                    payload_length);
1426         if (iov_ret < 0)
1427                 return -1;
1428
1429         iov_count += iov_ret;
1430
1431         padding = ((-payload_length) & 3);
1432         if (padding != 0) {
1433                 iov[iov_count].iov_base = cmd->pad_bytes;
1434                 iov[iov_count++].iov_len = padding;
1435                 rx_size += padding;
1436                 pr_debug("Receiving %u padding bytes.\n", padding);
1437         }
1438
1439         if (conn->conn_ops->DataDigest) {
1440                 iov[iov_count].iov_base = &checksum;
1441                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1442                 rx_size += ISCSI_CRC_LEN;
1443         }
1444
1445         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1446
1447         iscsit_unmap_iovec(cmd);
1448
1449         if (rx_got != rx_size)
1450                 return -1;
1451
1452         if (conn->conn_ops->DataDigest) {
1453                 u32 data_crc;
1454
1455                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1456                                                     be32_to_cpu(hdr->offset),
1457                                                     payload_length, padding,
1458                                                     cmd->pad_bytes);
1459
1460                 if (checksum != data_crc) {
1461                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1462                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1463                                 " does not match computed 0x%08x\n",
1464                                 hdr->itt, hdr->offset, payload_length,
1465                                 hdr->datasn, checksum, data_crc);
1466                         data_crc_failed = 1;
1467                 } else {
1468                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1469                                 " %u bytes of Data Out\n", checksum,
1470                                 payload_length);
1471                 }
1472         }
1473
1474         return data_crc_failed;
1475 }
1476
1477 int
1478 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1479                              bool data_crc_failed)
1480 {
1481         struct iscsi_conn *conn = cmd->conn;
1482         int rc, ooo_cmdsn;
1483         /*
1484          * Increment post receive data and CRC values or perform
1485          * within-command recovery.
1486          */
1487         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1488         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1489                 return 0;
1490         else if (rc == DATAOUT_SEND_R2T) {
1491                 iscsit_set_dataout_sequence_values(cmd);
1492                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1493         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1494                 /*
1495                  * Handle extra special case for out of order
1496                  * Unsolicited Data Out.
1497                  */
1498                 spin_lock_bh(&cmd->istate_lock);
1499                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1500                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1501                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1502                 spin_unlock_bh(&cmd->istate_lock);
1503
1504                 iscsit_stop_dataout_timer(cmd);
1505                 if (ooo_cmdsn)
1506                         return 0;
1507                 target_execute_cmd(&cmd->se_cmd);
1508                 return 0;
1509         } else /* DATAOUT_CANNOT_RECOVER */
1510                 return -1;
1511
1512         return 0;
1513 }
1514 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1515
1516 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1517 {
1518         struct iscsi_cmd *cmd;
1519         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1520         int rc;
1521         bool data_crc_failed = false;
1522
1523         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1524         if (rc < 0)
1525                 return rc;
1526         else if (!cmd)
1527                 return 0;
1528
1529         rc = iscsit_get_dataout(conn, cmd, hdr);
1530         if (rc < 0)
1531                 return rc;
1532         else if (rc > 0)
1533                 data_crc_failed = true;
1534
1535         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1536 }
1537
1538 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1539                          struct iscsi_nopout *hdr)
1540 {
1541         u32 payload_length = ntoh24(hdr->dlength);
1542
1543         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1544                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1545                         " not set, protocol error.\n");
1546                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1547                                         1, 0, (unsigned char *)hdr, cmd);
1548         }
1549
1550         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1551                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1552                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1553                         " error.\n", payload_length,
1554                         conn->conn_ops->MaxXmitDataSegmentLength);
1555                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1556                                         1, 0, (unsigned char *)hdr, cmd);
1557         }
1558
1559         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1560                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1561                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1562                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1563                 payload_length);
1564         /*
1565          * This is not a response to a Unsolicited NopIN, which means
1566          * it can either be a NOPOUT ping request (with a valid ITT),
1567          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1568          * Either way, make sure we allocate an struct iscsi_cmd, as both
1569          * can contain ping data.
1570          */
1571         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1572                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1573                 cmd->i_state            = ISTATE_SEND_NOPIN;
1574                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1575                                                 1 : 0);
1576                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1577                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1578                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1579                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1580                 cmd->data_direction     = DMA_NONE;
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_setup_nop_out);
1586
1587 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1588                            struct iscsi_nopout *hdr)
1589 {
1590         struct iscsi_cmd *cmd_p = NULL;
1591         int cmdsn_ret = 0;
1592         /*
1593          * Initiator is expecting a NopIN ping reply..
1594          */
1595         if (hdr->itt != RESERVED_ITT) {
1596                 BUG_ON(!cmd);
1597
1598                 spin_lock_bh(&conn->cmd_lock);
1599                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1600                 spin_unlock_bh(&conn->cmd_lock);
1601
1602                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1603
1604                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1605                         iscsit_add_cmd_to_response_queue(cmd, conn,
1606                                                          cmd->i_state);
1607                         return 0;
1608                 }
1609
1610                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1611                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1612                         return 0;
1613
1614                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1615                         return iscsit_add_reject_from_cmd(
1616                                         ISCSI_REASON_PROTOCOL_ERROR,
1617                                         1, 0, (unsigned char *)hdr, cmd);
1618
1619                 return 0;
1620         }
1621         /*
1622          * This was a response to a unsolicited NOPIN ping.
1623          */
1624         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1625                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1626                 if (!cmd_p)
1627                         return -EINVAL;
1628
1629                 iscsit_stop_nopin_response_timer(conn);
1630
1631                 cmd_p->i_state = ISTATE_REMOVE;
1632                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1633
1634                 iscsit_start_nopin_timer(conn);
1635                 return 0;
1636         }
1637         /*
1638          * Otherwise, initiator is not expecting a NOPIN is response.
1639          * Just ignore for now.
1640          */
1641         return 0;
1642 }
1643 EXPORT_SYMBOL(iscsit_process_nop_out);
1644
1645 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1646                                  unsigned char *buf)
1647 {
1648         unsigned char *ping_data = NULL;
1649         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1650         struct kvec *iov = NULL;
1651         u32 payload_length = ntoh24(hdr->dlength);
1652         int ret;
1653
1654         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1655         if (ret < 0)
1656                 return ret;
1657         /*
1658          * Handle NOP-OUT payload for traditional iSCSI sockets
1659          */
1660         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1661                 u32 checksum, data_crc, padding = 0;
1662                 int niov = 0, rx_got, rx_size = payload_length;
1663
1664                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1665                 if (!ping_data) {
1666                         pr_err("Unable to allocate memory for"
1667                                 " NOPOUT ping data.\n");
1668                         ret = -1;
1669                         goto out;
1670                 }
1671
1672                 iov = &cmd->iov_misc[0];
1673                 iov[niov].iov_base      = ping_data;
1674                 iov[niov++].iov_len     = payload_length;
1675
1676                 padding = ((-payload_length) & 3);
1677                 if (padding != 0) {
1678                         pr_debug("Receiving %u additional bytes"
1679                                 " for padding.\n", padding);
1680                         iov[niov].iov_base      = &cmd->pad_bytes;
1681                         iov[niov++].iov_len     = padding;
1682                         rx_size += padding;
1683                 }
1684                 if (conn->conn_ops->DataDigest) {
1685                         iov[niov].iov_base      = &checksum;
1686                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1687                         rx_size += ISCSI_CRC_LEN;
1688                 }
1689
1690                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1691                 if (rx_got != rx_size) {
1692                         ret = -1;
1693                         goto out;
1694                 }
1695
1696                 if (conn->conn_ops->DataDigest) {
1697                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1698                                         ping_data, payload_length,
1699                                         padding, cmd->pad_bytes,
1700                                         (u8 *)&data_crc);
1701
1702                         if (checksum != data_crc) {
1703                                 pr_err("Ping data CRC32C DataDigest"
1704                                 " 0x%08x does not match computed 0x%08x\n",
1705                                         checksum, data_crc);
1706                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1707                                         pr_err("Unable to recover from"
1708                                         " NOPOUT Ping DataCRC failure while in"
1709                                                 " ERL=0.\n");
1710                                         ret = -1;
1711                                         goto out;
1712                                 } else {
1713                                         /*
1714                                          * Silently drop this PDU and let the
1715                                          * initiator plug the CmdSN gap.
1716                                          */
1717                                         pr_debug("Dropping NOPOUT"
1718                                         " Command CmdSN: 0x%08x due to"
1719                                         " DataCRC error.\n", hdr->cmdsn);
1720                                         ret = 0;
1721                                         goto out;
1722                                 }
1723                         } else {
1724                                 pr_debug("Got CRC32C DataDigest"
1725                                 " 0x%08x for %u bytes of ping data.\n",
1726                                         checksum, payload_length);
1727                         }
1728                 }
1729
1730                 ping_data[payload_length] = '\0';
1731                 /*
1732                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1733                  */
1734                 cmd->buf_ptr = ping_data;
1735                 cmd->buf_ptr_size = payload_length;
1736
1737                 pr_debug("Got %u bytes of NOPOUT ping"
1738                         " data.\n", payload_length);
1739                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1740         }
1741
1742         return iscsit_process_nop_out(conn, cmd, hdr);
1743 out:
1744         if (cmd)
1745                 iscsit_free_cmd(cmd, false);
1746
1747         kfree(ping_data);
1748         return ret;
1749 }
1750
1751 int
1752 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1753                            unsigned char *buf)
1754 {
1755         struct se_tmr_req *se_tmr;
1756         struct iscsi_tmr_req *tmr_req;
1757         struct iscsi_tm *hdr;
1758         int out_of_order_cmdsn = 0;
1759         int ret;
1760         u8 function;
1761
1762         hdr                     = (struct iscsi_tm *) buf;
1763         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1764         function = hdr->flags;
1765
1766         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1767                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1768                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1769                 hdr->rtt, hdr->refcmdsn, conn->cid);
1770
1771         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1772             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1773              hdr->rtt != RESERVED_ITT)) {
1774                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1775                 hdr->rtt = RESERVED_ITT;
1776         }
1777
1778         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1779                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1780                 pr_err("Task Management Request TASK_REASSIGN not"
1781                         " issued as immediate command, bad iSCSI Initiator"
1782                                 "implementation\n");
1783                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1784                                         1, 1, buf, cmd);
1785         }
1786         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1787             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1788                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1789
1790         cmd->data_direction = DMA_NONE;
1791
1792         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1793         if (!cmd->tmr_req) {
1794                 pr_err("Unable to allocate memory for"
1795                         " Task Management command!\n");
1796                 return iscsit_add_reject_from_cmd(
1797                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1798                         1, 1, buf, cmd);
1799         }
1800
1801         /*
1802          * TASK_REASSIGN for ERL=2 / connection stays inside of
1803          * LIO-Target $FABRIC_MOD
1804          */
1805         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1806
1807                 u8 tcm_function;
1808                 int ret;
1809
1810                 transport_init_se_cmd(&cmd->se_cmd,
1811                                       &lio_target_fabric_configfs->tf_ops,
1812                                       conn->sess->se_sess, 0, DMA_NONE,
1813                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1814
1815                 switch (function) {
1816                 case ISCSI_TM_FUNC_ABORT_TASK:
1817                         tcm_function = TMR_ABORT_TASK;
1818                         break;
1819                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1820                         tcm_function = TMR_ABORT_TASK_SET;
1821                         break;
1822                 case ISCSI_TM_FUNC_CLEAR_ACA:
1823                         tcm_function = TMR_CLEAR_ACA;
1824                         break;
1825                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1826                         tcm_function = TMR_CLEAR_TASK_SET;
1827                         break;
1828                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1829                         tcm_function = TMR_LUN_RESET;
1830                         break;
1831                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1832                         tcm_function = TMR_TARGET_WARM_RESET;
1833                         break;
1834                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1835                         tcm_function = TMR_TARGET_COLD_RESET;
1836                         break;
1837                 default:
1838                         pr_err("Unknown iSCSI TMR Function:"
1839                                " 0x%02x\n", function);
1840                         return iscsit_add_reject_from_cmd(
1841                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1842                                 1, 1, buf, cmd);
1843                 }
1844
1845                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1846                                          tcm_function, GFP_KERNEL);
1847                 if (ret < 0)
1848                         return iscsit_add_reject_from_cmd(
1849                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1850                                 1, 1, buf, cmd);
1851
1852                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1853         }
1854
1855         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1856         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1857         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1858         cmd->init_task_tag      = hdr->itt;
1859         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1860         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1861         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1862         se_tmr                  = cmd->se_cmd.se_tmr_req;
1863         tmr_req                 = cmd->tmr_req;
1864         /*
1865          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1866          */
1867         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1868                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1869                                                scsilun_to_int(&hdr->lun));
1870                 if (ret < 0) {
1871                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1872                         goto attach;
1873                 }
1874         }
1875
1876         switch (function) {
1877         case ISCSI_TM_FUNC_ABORT_TASK:
1878                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1879                 if (se_tmr->response)
1880                         goto attach;
1881                 break;
1882         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1883         case ISCSI_TM_FUNC_CLEAR_ACA:
1884         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1885         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1886                 break;
1887         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1888                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1889                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1890                         goto attach;
1891                 }
1892                 break;
1893         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1894                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1895                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1896                         goto attach;
1897                 }
1898                 break;
1899         case ISCSI_TM_FUNC_TASK_REASSIGN:
1900                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1901                 /*
1902                  * Perform sanity checks on the ExpDataSN only if the
1903                  * TASK_REASSIGN was successful.
1904                  */
1905                 if (se_tmr->response)
1906                         break;
1907
1908                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1909                         return iscsit_add_reject_from_cmd(
1910                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1911                                         buf, cmd);
1912                 break;
1913         default:
1914                 pr_err("Unknown TMR function: 0x%02x, protocol"
1915                         " error.\n", function);
1916                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1917                 goto attach;
1918         }
1919
1920         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1921             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1922                 se_tmr->call_transport = 1;
1923 attach:
1924         spin_lock_bh(&conn->cmd_lock);
1925         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1926         spin_unlock_bh(&conn->cmd_lock);
1927
1928         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1929                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1930                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1931                         out_of_order_cmdsn = 1;
1932                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1933                         return 0;
1934                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1935                         return iscsit_add_reject_from_cmd(
1936                                         ISCSI_REASON_PROTOCOL_ERROR,
1937                                         1, 0, buf, cmd);
1938         }
1939         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1940
1941         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1942                 return 0;
1943         /*
1944          * Found the referenced task, send to transport for processing.
1945          */
1946         if (se_tmr->call_transport)
1947                 return transport_generic_handle_tmr(&cmd->se_cmd);
1948
1949         /*
1950          * Could not find the referenced LUN, task, or Task Management
1951          * command not authorized or supported.  Change state and
1952          * let the tx_thread send the response.
1953          *
1954          * For connection recovery, this is also the default action for
1955          * TMR TASK_REASSIGN.
1956          */
1957         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1958         return 0;
1959 }
1960 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1961
1962 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1963 int
1964 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1965                       struct iscsi_text *hdr)
1966 {
1967         u32 payload_length = ntoh24(hdr->dlength);
1968
1969         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1970                 pr_err("Unable to accept text parameter length: %u"
1971                         "greater than MaxXmitDataSegmentLength %u.\n",
1972                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1973                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1974                                         1, 0, (unsigned char *)hdr, cmd);
1975         }
1976
1977         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1978                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1979                 hdr->exp_statsn, payload_length);
1980
1981         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1982         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1983         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1984         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1985         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1986         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1987         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1988         cmd->data_direction     = DMA_NONE;
1989
1990         return 0;
1991 }
1992 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1993
1994 int
1995 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1996                         struct iscsi_text *hdr)
1997 {
1998         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1999         int cmdsn_ret;
2000
2001         if (!text_in) {
2002                 pr_err("Unable to locate text_in buffer for sendtargets"
2003                        " discovery\n");
2004                 goto reject;
2005         }
2006         if (strncmp("SendTargets", text_in, 11) != 0) {
2007                 pr_err("Received Text Data that is not"
2008                         " SendTargets, cannot continue.\n");
2009                 goto reject;
2010         }
2011         text_ptr = strchr(text_in, '=');
2012         if (!text_ptr) {
2013                 pr_err("No \"=\" separator found in Text Data,"
2014                         "  cannot continue.\n");
2015                 goto reject;
2016         }
2017         if (!strncmp("=All", text_ptr, 4)) {
2018                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2019         } else {
2020                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2021                 goto reject;
2022         }
2023
2024         spin_lock_bh(&conn->cmd_lock);
2025         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2026         spin_unlock_bh(&conn->cmd_lock);
2027
2028         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2029
2030         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2031                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2032                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2033                         return iscsit_add_reject_from_cmd(
2034                                         ISCSI_REASON_PROTOCOL_ERROR,
2035                                         1, 0, (unsigned char *)hdr, cmd);
2036                 return 0;
2037         }
2038
2039         return iscsit_execute_cmd(cmd, 0);
2040
2041 reject:
2042         return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
2043                                           0, 0, (unsigned char *)hdr, cmd);
2044 }
2045 EXPORT_SYMBOL(iscsit_process_text_cmd);
2046
2047 static int
2048 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2049                        unsigned char *buf)
2050 {
2051         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2052         char *text_in = NULL;
2053         u32 payload_length = ntoh24(hdr->dlength);
2054         int rx_size, rc;
2055
2056         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2057         if (rc < 0)
2058                 return rc;
2059
2060         rx_size = payload_length;
2061         if (payload_length) {
2062                 u32 checksum = 0, data_crc = 0;
2063                 u32 padding = 0, pad_bytes = 0;
2064                 int niov = 0, rx_got;
2065                 struct kvec iov[3];
2066
2067                 text_in = kzalloc(payload_length, GFP_KERNEL);
2068                 if (!text_in) {
2069                         pr_err("Unable to allocate memory for"
2070                                 " incoming text parameters\n");
2071                         goto reject;
2072                 }
2073                 cmd->text_in_ptr = text_in;
2074
2075                 memset(iov, 0, 3 * sizeof(struct kvec));
2076                 iov[niov].iov_base      = text_in;
2077                 iov[niov++].iov_len     = payload_length;
2078
2079                 padding = ((-payload_length) & 3);
2080                 if (padding != 0) {
2081                         iov[niov].iov_base = &pad_bytes;
2082                         iov[niov++].iov_len  = padding;
2083                         rx_size += padding;
2084                         pr_debug("Receiving %u additional bytes"
2085                                         " for padding.\n", padding);
2086                 }
2087                 if (conn->conn_ops->DataDigest) {
2088                         iov[niov].iov_base      = &checksum;
2089                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2090                         rx_size += ISCSI_CRC_LEN;
2091                 }
2092
2093                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2094                 if (rx_got != rx_size)
2095                         goto reject;
2096
2097                 if (conn->conn_ops->DataDigest) {
2098                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2099                                         text_in, payload_length,
2100                                         padding, (u8 *)&pad_bytes,
2101                                         (u8 *)&data_crc);
2102
2103                         if (checksum != data_crc) {
2104                                 pr_err("Text data CRC32C DataDigest"
2105                                         " 0x%08x does not match computed"
2106                                         " 0x%08x\n", checksum, data_crc);
2107                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2108                                         pr_err("Unable to recover from"
2109                                         " Text Data digest failure while in"
2110                                                 " ERL=0.\n");
2111                                         goto reject;
2112                                 } else {
2113                                         /*
2114                                          * Silently drop this PDU and let the
2115                                          * initiator plug the CmdSN gap.
2116                                          */
2117                                         pr_debug("Dropping Text"
2118                                         " Command CmdSN: 0x%08x due to"
2119                                         " DataCRC error.\n", hdr->cmdsn);
2120                                         kfree(text_in);
2121                                         return 0;
2122                                 }
2123                         } else {
2124                                 pr_debug("Got CRC32C DataDigest"
2125                                         " 0x%08x for %u bytes of text data.\n",
2126                                                 checksum, payload_length);
2127                         }
2128                 }
2129                 text_in[payload_length - 1] = '\0';
2130                 pr_debug("Successfully read %d bytes of text"
2131                                 " data.\n", payload_length);
2132         }
2133
2134         return iscsit_process_text_cmd(conn, cmd, hdr);
2135
2136 reject:
2137         kfree(cmd->text_in_ptr);
2138         cmd->text_in_ptr = NULL;
2139         return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
2140                                           0, 0, buf, cmd);
2141 }
2142 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2143
2144 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2145 {
2146         struct iscsi_conn *conn_p;
2147         struct iscsi_session *sess = conn->sess;
2148
2149         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2150                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2151
2152         atomic_set(&sess->session_logout, 1);
2153         atomic_set(&conn->conn_logout_remove, 1);
2154         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2155
2156         iscsit_inc_conn_usage_count(conn);
2157         iscsit_inc_session_usage_count(sess);
2158
2159         spin_lock_bh(&sess->conn_lock);
2160         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2161                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2162                         continue;
2163
2164                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2165                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2166         }
2167         spin_unlock_bh(&sess->conn_lock);
2168
2169         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2170
2171         return 0;
2172 }
2173
2174 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2175 {
2176         struct iscsi_conn *l_conn;
2177         struct iscsi_session *sess = conn->sess;
2178
2179         pr_debug("Received logout request CLOSECONNECTION for CID:"
2180                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2181
2182         /*
2183          * A Logout Request with a CLOSECONNECTION reason code for a CID
2184          * can arrive on a connection with a differing CID.
2185          */
2186         if (conn->cid == cmd->logout_cid) {
2187                 spin_lock_bh(&conn->state_lock);
2188                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2189                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2190
2191                 atomic_set(&conn->conn_logout_remove, 1);
2192                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2193                 iscsit_inc_conn_usage_count(conn);
2194
2195                 spin_unlock_bh(&conn->state_lock);
2196         } else {
2197                 /*
2198                  * Handle all different cid CLOSECONNECTION requests in
2199                  * iscsit_logout_post_handler_diffcid() as to give enough
2200                  * time for any non immediate command's CmdSN to be
2201                  * acknowledged on the connection in question.
2202                  *
2203                  * Here we simply make sure the CID is still around.
2204                  */
2205                 l_conn = iscsit_get_conn_from_cid(sess,
2206                                 cmd->logout_cid);
2207                 if (!l_conn) {
2208                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2209                         iscsit_add_cmd_to_response_queue(cmd, conn,
2210                                         cmd->i_state);
2211                         return 0;
2212                 }
2213
2214                 iscsit_dec_conn_usage_count(l_conn);
2215         }
2216
2217         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2218
2219         return 0;
2220 }
2221
2222 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2223 {
2224         struct iscsi_session *sess = conn->sess;
2225
2226         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2227                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2228
2229         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2230                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2231                         " while ERL!=2.\n");
2232                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2233                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2234                 return 0;
2235         }
2236
2237         if (conn->cid == cmd->logout_cid) {
2238                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2239                         " with CID: %hu on CID: %hu, implementation error.\n",
2240                                 cmd->logout_cid, conn->cid);
2241                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2242                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2243                 return 0;
2244         }
2245
2246         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247
2248         return 0;
2249 }
2250
2251 int
2252 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2253                         unsigned char *buf)
2254 {
2255         int cmdsn_ret, logout_remove = 0;
2256         u8 reason_code = 0;
2257         struct iscsi_logout *hdr;
2258         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2259
2260         hdr                     = (struct iscsi_logout *) buf;
2261         reason_code             = (hdr->flags & 0x7f);
2262
2263         if (tiqn) {
2264                 spin_lock(&tiqn->logout_stats.lock);
2265                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2266                         tiqn->logout_stats.normal_logouts++;
2267                 else
2268                         tiqn->logout_stats.abnormal_logouts++;
2269                 spin_unlock(&tiqn->logout_stats.lock);
2270         }
2271
2272         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2273                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2274                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2275                 hdr->cid, conn->cid);
2276
2277         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2278                 pr_err("Received logout request on connection that"
2279                         " is not in logged in state, ignoring request.\n");
2280                 iscsit_free_cmd(cmd, false);
2281                 return 0;
2282         }
2283
2284         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2285         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2286         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2287         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2288         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2289         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2290         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2291         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2292         cmd->logout_reason      = reason_code;
2293         cmd->data_direction     = DMA_NONE;
2294
2295         /*
2296          * We need to sleep in these cases (by returning 1) until the Logout
2297          * Response gets sent in the tx thread.
2298          */
2299         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2300            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2301             be16_to_cpu(hdr->cid) == conn->cid))
2302                 logout_remove = 1;
2303
2304         spin_lock_bh(&conn->cmd_lock);
2305         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2306         spin_unlock_bh(&conn->cmd_lock);
2307
2308         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2309                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2310
2311         /*
2312          * Immediate commands are executed, well, immediately.
2313          * Non-Immediate Logout Commands are executed in CmdSN order.
2314          */
2315         if (cmd->immediate_cmd) {
2316                 int ret = iscsit_execute_cmd(cmd, 0);
2317
2318                 if (ret < 0)
2319                         return ret;
2320         } else {
2321                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2322                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2323                         logout_remove = 0;
2324                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2325                         return iscsit_add_reject_from_cmd(
2326                                 ISCSI_REASON_PROTOCOL_ERROR,
2327                                 1, 0, buf, cmd);
2328                 }
2329         }
2330
2331         return logout_remove;
2332 }
2333 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2334
2335 static int iscsit_handle_snack(
2336         struct iscsi_conn *conn,
2337         unsigned char *buf)
2338 {
2339         struct iscsi_snack *hdr;
2340
2341         hdr                     = (struct iscsi_snack *) buf;
2342         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2343
2344         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2345                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2346                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2347                         hdr->begrun, hdr->runlength, conn->cid);
2348
2349         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2350                 pr_err("Initiator sent SNACK request while in"
2351                         " ErrorRecoveryLevel=0.\n");
2352                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2353                                         buf, conn);
2354         }
2355         /*
2356          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2357          * call from inside iscsi_send_recovery_datain_or_r2t().
2358          */
2359         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2360         case 0:
2361                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2362                         hdr->itt,
2363                         be32_to_cpu(hdr->ttt),
2364                         be32_to_cpu(hdr->begrun),
2365                         be32_to_cpu(hdr->runlength));
2366         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2367                 return iscsit_handle_status_snack(conn, hdr->itt,
2368                         be32_to_cpu(hdr->ttt),
2369                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2370         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2371                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2372                         be32_to_cpu(hdr->begrun),
2373                         be32_to_cpu(hdr->runlength));
2374         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2375                 /* FIXME: Support R-Data SNACK */
2376                 pr_err("R-Data SNACK Not Supported.\n");
2377                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2378                                         buf, conn);
2379         default:
2380                 pr_err("Unknown SNACK type 0x%02x, protocol"
2381                         " error.\n", hdr->flags & 0x0f);
2382                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2383                                         buf, conn);
2384         }
2385
2386         return 0;
2387 }
2388
2389 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2390 {
2391         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2392             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2393                 wait_for_completion_interruptible_timeout(
2394                                         &conn->rx_half_close_comp,
2395                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2396         }
2397 }
2398
2399 static int iscsit_handle_immediate_data(
2400         struct iscsi_cmd *cmd,
2401         struct iscsi_scsi_req *hdr,
2402         u32 length)
2403 {
2404         int iov_ret, rx_got = 0, rx_size = 0;
2405         u32 checksum, iov_count = 0, padding = 0;
2406         struct iscsi_conn *conn = cmd->conn;
2407         struct kvec *iov;
2408
2409         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2410         if (iov_ret < 0)
2411                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2412
2413         rx_size = length;
2414         iov_count = iov_ret;
2415         iov = &cmd->iov_data[0];
2416
2417         padding = ((-length) & 3);
2418         if (padding != 0) {
2419                 iov[iov_count].iov_base = cmd->pad_bytes;
2420                 iov[iov_count++].iov_len = padding;
2421                 rx_size += padding;
2422         }
2423
2424         if (conn->conn_ops->DataDigest) {
2425                 iov[iov_count].iov_base         = &checksum;
2426                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2427                 rx_size += ISCSI_CRC_LEN;
2428         }
2429
2430         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2431
2432         iscsit_unmap_iovec(cmd);
2433
2434         if (rx_got != rx_size) {
2435                 iscsit_rx_thread_wait_for_tcp(conn);
2436                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2437         }
2438
2439         if (conn->conn_ops->DataDigest) {
2440                 u32 data_crc;
2441
2442                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2443                                                     cmd->write_data_done, length, padding,
2444                                                     cmd->pad_bytes);
2445
2446                 if (checksum != data_crc) {
2447                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2448                                 " does not match computed 0x%08x\n", checksum,
2449                                 data_crc);
2450
2451                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2452                                 pr_err("Unable to recover from"
2453                                         " Immediate Data digest failure while"
2454                                         " in ERL=0.\n");
2455                                 iscsit_add_reject_from_cmd(
2456                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2457                                                 1, 0, (unsigned char *)hdr, cmd);
2458                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2459                         } else {
2460                                 iscsit_add_reject_from_cmd(
2461                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2462                                                 0, 0, (unsigned char *)hdr, cmd);
2463                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2464                         }
2465                 } else {
2466                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2467                                 " %u bytes of Immediate Data\n", checksum,
2468                                 length);
2469                 }
2470         }
2471
2472         cmd->write_data_done += length;
2473
2474         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2475                 spin_lock_bh(&cmd->istate_lock);
2476                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2477                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2478                 spin_unlock_bh(&cmd->istate_lock);
2479         }
2480
2481         return IMMEDIATE_DATA_NORMAL_OPERATION;
2482 }
2483
2484 /*
2485  *      Called with sess->conn_lock held.
2486  */
2487 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2488         with active network interface */
2489 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2490 {
2491         struct iscsi_cmd *cmd;
2492         struct iscsi_conn *conn_p;
2493
2494         /*
2495          * Only send a Asynchronous Message on connections whos network
2496          * interface is still functional.
2497          */
2498         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2499                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2500                         iscsit_inc_conn_usage_count(conn_p);
2501                         break;
2502                 }
2503         }
2504
2505         if (!conn_p)
2506                 return;
2507
2508         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2509         if (!cmd) {
2510                 iscsit_dec_conn_usage_count(conn_p);
2511                 return;
2512         }
2513
2514         cmd->logout_cid = conn->cid;
2515         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2516         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2517
2518         spin_lock_bh(&conn_p->cmd_lock);
2519         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2520         spin_unlock_bh(&conn_p->cmd_lock);
2521
2522         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2523         iscsit_dec_conn_usage_count(conn_p);
2524 }
2525
2526 static int iscsit_send_conn_drop_async_message(
2527         struct iscsi_cmd *cmd,
2528         struct iscsi_conn *conn)
2529 {
2530         struct iscsi_async *hdr;
2531
2532         cmd->tx_size = ISCSI_HDR_LEN;
2533         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2534
2535         hdr                     = (struct iscsi_async *) cmd->pdu;
2536         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2537         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2538         cmd->init_task_tag      = RESERVED_ITT;
2539         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2540         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2541         cmd->stat_sn            = conn->stat_sn++;
2542         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2543         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2544         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2545         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2546         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2547         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2548         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2549
2550         if (conn->conn_ops->HeaderDigest) {
2551                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2552
2553                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2554                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2555
2556                 cmd->tx_size += ISCSI_CRC_LEN;
2557                 pr_debug("Attaching CRC32C HeaderDigest to"
2558                         " Async Message 0x%08x\n", *header_digest);
2559         }
2560
2561         cmd->iov_misc[0].iov_base       = cmd->pdu;
2562         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2563         cmd->iov_misc_count             = 1;
2564
2565         pr_debug("Sending Connection Dropped Async Message StatSN:"
2566                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2567                         cmd->logout_cid, conn->cid);
2568         return 0;
2569 }
2570
2571 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2572 {
2573         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2574             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2575                 wait_for_completion_interruptible_timeout(
2576                                         &conn->tx_half_close_comp,
2577                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2578         }
2579 }
2580
2581 static void
2582 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2583                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2584                         bool set_statsn)
2585 {
2586         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2587         hdr->flags              = datain->flags;
2588         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2589                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2590                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2591                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2592                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2593                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2594                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2595                 }
2596         }
2597         hton24(hdr->dlength, datain->length);
2598         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2599                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2600                                 (struct scsi_lun *)&hdr->lun);
2601         else
2602                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2603
2604         hdr->itt                = cmd->init_task_tag;
2605
2606         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2607                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2608         else
2609                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2610         if (set_statsn)
2611                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2612         else
2613                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2614
2615         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2616         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2617         hdr->datasn             = cpu_to_be32(datain->data_sn);
2618         hdr->offset             = cpu_to_be32(datain->offset);
2619
2620         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2621                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2622                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2623                 ntohl(hdr->offset), datain->length, conn->cid);
2624 }
2625
2626 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2627 {
2628         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2629         struct iscsi_datain datain;
2630         struct iscsi_datain_req *dr;
2631         struct kvec *iov;
2632         u32 iov_count = 0, tx_size = 0;
2633         int eodr = 0, ret, iov_ret;
2634         bool set_statsn = false;
2635
2636         memset(&datain, 0, sizeof(struct iscsi_datain));
2637         dr = iscsit_get_datain_values(cmd, &datain);
2638         if (!dr) {
2639                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2640                                 cmd->init_task_tag);
2641                 return -1;
2642         }
2643         /*
2644          * Be paranoid and double check the logic for now.
2645          */
2646         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2647                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2648                         " datain.length: %u exceeds cmd->data_length: %u\n",
2649                         cmd->init_task_tag, datain.offset, datain.length,
2650                         cmd->se_cmd.data_length);
2651                 return -1;
2652         }
2653
2654         spin_lock_bh(&conn->sess->session_stats_lock);
2655         conn->sess->tx_data_octets += datain.length;
2656         if (conn->sess->se_sess->se_node_acl) {
2657                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2658                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2659                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2660         }
2661         spin_unlock_bh(&conn->sess->session_stats_lock);
2662         /*
2663          * Special case for successfully execution w/ both DATAIN
2664          * and Sense Data.
2665          */
2666         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2667             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2668                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2669         else {
2670                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2671                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2672                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2673                         cmd->stat_sn = conn->stat_sn++;
2674                         set_statsn = true;
2675                 } else if (dr->dr_complete ==
2676                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2677                         set_statsn = true;
2678         }
2679
2680         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2681
2682         iov = &cmd->iov_data[0];
2683         iov[iov_count].iov_base = cmd->pdu;
2684         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2685         tx_size += ISCSI_HDR_LEN;
2686
2687         if (conn->conn_ops->HeaderDigest) {
2688                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2689
2690                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2691                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2692
2693                 iov[0].iov_len += ISCSI_CRC_LEN;
2694                 tx_size += ISCSI_CRC_LEN;
2695
2696                 pr_debug("Attaching CRC32 HeaderDigest"
2697                         " for DataIN PDU 0x%08x\n", *header_digest);
2698         }
2699
2700         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2701                                 datain.offset, datain.length);
2702         if (iov_ret < 0)
2703                 return -1;
2704
2705         iov_count += iov_ret;
2706         tx_size += datain.length;
2707
2708         cmd->padding = ((-datain.length) & 3);
2709         if (cmd->padding) {
2710                 iov[iov_count].iov_base         = cmd->pad_bytes;
2711                 iov[iov_count++].iov_len        = cmd->padding;
2712                 tx_size += cmd->padding;
2713
2714                 pr_debug("Attaching %u padding bytes\n",
2715                                 cmd->padding);
2716         }
2717         if (conn->conn_ops->DataDigest) {
2718                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2719                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2720
2721                 iov[iov_count].iov_base = &cmd->data_crc;
2722                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2723                 tx_size += ISCSI_CRC_LEN;
2724
2725                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2726                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2727         }
2728
2729         cmd->iov_data_count = iov_count;
2730         cmd->tx_size = tx_size;
2731
2732         /* sendpage is preferred but can't insert markers */
2733         if (!conn->conn_ops->IFMarker)
2734                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2735         else
2736                 ret = iscsit_send_tx_data(cmd, conn, 0);
2737
2738         iscsit_unmap_iovec(cmd);
2739
2740         if (ret < 0) {
2741                 iscsit_tx_thread_wait_for_tcp(conn);
2742                 return ret;
2743         }
2744
2745         if (dr->dr_complete) {
2746                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2747                                 2 : 1;
2748                 iscsit_free_datain_req(cmd, dr);
2749         }
2750
2751         return eodr;
2752 }
2753
2754 int
2755 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2756                         struct iscsi_logout_rsp *hdr)
2757 {
2758         struct iscsi_conn *logout_conn = NULL;
2759         struct iscsi_conn_recovery *cr = NULL;
2760         struct iscsi_session *sess = conn->sess;
2761         /*
2762          * The actual shutting down of Sessions and/or Connections
2763          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2764          * is done in scsi_logout_post_handler().
2765          */
2766         switch (cmd->logout_reason) {
2767         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2768                 pr_debug("iSCSI session logout successful, setting"
2769                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2770                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2771                 break;
2772         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2773                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2774                         break;
2775                 /*
2776                  * For CLOSECONNECTION logout requests carrying
2777                  * a matching logout CID -> local CID, the reference
2778                  * for the local CID will have been incremented in
2779                  * iscsi_logout_closeconnection().
2780                  *
2781                  * For CLOSECONNECTION logout requests carrying
2782                  * a different CID than the connection it arrived
2783                  * on, the connection responding to cmd->logout_cid
2784                  * is stopped in iscsit_logout_post_handler_diffcid().
2785                  */
2786
2787                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2788                         " successful.\n", cmd->logout_cid, conn->cid);
2789                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2790                 break;
2791         case ISCSI_LOGOUT_REASON_RECOVERY:
2792                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2793                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2794                         break;
2795                 /*
2796                  * If the connection is still active from our point of view
2797                  * force connection recovery to occur.
2798                  */
2799                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2800                                 cmd->logout_cid);
2801                 if (logout_conn) {
2802                         iscsit_connection_reinstatement_rcfr(logout_conn);
2803                         iscsit_dec_conn_usage_count(logout_conn);
2804                 }
2805
2806                 cr = iscsit_get_inactive_connection_recovery_entry(
2807                                 conn->sess, cmd->logout_cid);
2808                 if (!cr) {
2809                         pr_err("Unable to locate CID: %hu for"
2810                         " REMOVECONNFORRECOVERY Logout Request.\n",
2811                                 cmd->logout_cid);
2812                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2813                         break;
2814                 }
2815
2816                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2817
2818                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2819                         " for recovery for CID: %hu on CID: %hu successful.\n",
2820                                 cmd->logout_cid, conn->cid);
2821                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2822                 break;
2823         default:
2824                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2825                                 cmd->logout_reason);
2826                 return -1;
2827         }
2828
2829         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2830         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2831         hdr->response           = cmd->logout_response;
2832         hdr->itt                = cmd->init_task_tag;
2833         cmd->stat_sn            = conn->stat_sn++;
2834         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2835
2836         iscsit_increment_maxcmdsn(cmd, conn->sess);
2837         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2838         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2839
2840         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2841                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2842                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2843                 cmd->logout_cid, conn->cid);
2844
2845         return 0;
2846 }
2847 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2848
2849 static int
2850 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2851 {
2852         struct kvec *iov;
2853         int niov = 0, tx_size, rc;
2854
2855         rc = iscsit_build_logout_rsp(cmd, conn,
2856                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2857         if (rc < 0)
2858                 return rc;
2859
2860         tx_size = ISCSI_HDR_LEN;
2861         iov = &cmd->iov_misc[0];
2862         iov[niov].iov_base      = cmd->pdu;
2863         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2864
2865         if (conn->conn_ops->HeaderDigest) {
2866                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2867
2868                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2869                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2870
2871                 iov[0].iov_len += ISCSI_CRC_LEN;
2872                 tx_size += ISCSI_CRC_LEN;
2873                 pr_debug("Attaching CRC32C HeaderDigest to"
2874                         " Logout Response 0x%08x\n", *header_digest);
2875         }
2876         cmd->iov_misc_count = niov;
2877         cmd->tx_size = tx_size;
2878
2879         return 0;
2880 }
2881
2882 void
2883 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2884                        struct iscsi_nopin *hdr, bool nopout_response)
2885 {
2886         hdr->opcode             = ISCSI_OP_NOOP_IN;
2887         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2888         hton24(hdr->dlength, cmd->buf_ptr_size);
2889         if (nopout_response)
2890                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2891         hdr->itt                = cmd->init_task_tag;
2892         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2893         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2894                                   conn->stat_sn;
2895         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2896
2897         if (nopout_response)
2898                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2899
2900         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2901         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2902
2903         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2904                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2905                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2906                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2907 }
2908 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2909
2910 /*
2911  *      Unsolicited NOPIN, either requesting a response or not.
2912  */
2913 static int iscsit_send_unsolicited_nopin(
2914         struct iscsi_cmd *cmd,
2915         struct iscsi_conn *conn,
2916         int want_response)
2917 {
2918         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2919         int tx_size = ISCSI_HDR_LEN, ret;
2920
2921         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2922
2923         if (conn->conn_ops->HeaderDigest) {
2924                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2925
2926                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2927                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2928
2929                 tx_size += ISCSI_CRC_LEN;
2930                 pr_debug("Attaching CRC32C HeaderDigest to"
2931                         " NopIN 0x%08x\n", *header_digest);
2932         }
2933
2934         cmd->iov_misc[0].iov_base       = cmd->pdu;
2935         cmd->iov_misc[0].iov_len        = tx_size;
2936         cmd->iov_misc_count     = 1;
2937         cmd->tx_size            = tx_size;
2938
2939         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2940                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2941
2942         ret = iscsit_send_tx_data(cmd, conn, 1);
2943         if (ret < 0) {
2944                 iscsit_tx_thread_wait_for_tcp(conn);
2945                 return ret;
2946         }
2947
2948         spin_lock_bh(&cmd->istate_lock);
2949         cmd->i_state = want_response ?
2950                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2951         spin_unlock_bh(&cmd->istate_lock);
2952
2953         return 0;
2954 }
2955
2956 static int
2957 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2958 {
2959         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2960         struct kvec *iov;
2961         u32 padding = 0;
2962         int niov = 0, tx_size;
2963
2964         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2965
2966         tx_size = ISCSI_HDR_LEN;
2967         iov = &cmd->iov_misc[0];
2968         iov[niov].iov_base      = cmd->pdu;
2969         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2970
2971         if (conn->conn_ops->HeaderDigest) {
2972                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2973
2974                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2975                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2976
2977                 iov[0].iov_len += ISCSI_CRC_LEN;
2978                 tx_size += ISCSI_CRC_LEN;
2979                 pr_debug("Attaching CRC32C HeaderDigest"
2980                         " to NopIn 0x%08x\n", *header_digest);
2981         }
2982
2983         /*
2984          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2985          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2986          */
2987         if (cmd->buf_ptr_size) {
2988                 iov[niov].iov_base      = cmd->buf_ptr;
2989                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2990                 tx_size += cmd->buf_ptr_size;
2991
2992                 pr_debug("Echoing back %u bytes of ping"
2993                         " data.\n", cmd->buf_ptr_size);
2994
2995                 padding = ((-cmd->buf_ptr_size) & 3);
2996                 if (padding != 0) {
2997                         iov[niov].iov_base = &cmd->pad_bytes;
2998                         iov[niov++].iov_len = padding;
2999                         tx_size += padding;
3000                         pr_debug("Attaching %u additional"
3001                                 " padding bytes.\n", padding);
3002                 }
3003                 if (conn->conn_ops->DataDigest) {
3004                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3005                                 cmd->buf_ptr, cmd->buf_ptr_size,
3006                                 padding, (u8 *)&cmd->pad_bytes,
3007                                 (u8 *)&cmd->data_crc);
3008
3009                         iov[niov].iov_base = &cmd->data_crc;
3010                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3011                         tx_size += ISCSI_CRC_LEN;
3012                         pr_debug("Attached DataDigest for %u"
3013                                 " bytes of ping data, CRC 0x%08x\n",
3014                                 cmd->buf_ptr_size, cmd->data_crc);
3015                 }
3016         }
3017
3018         cmd->iov_misc_count = niov;
3019         cmd->tx_size = tx_size;
3020
3021         return 0;
3022 }
3023
3024 static int iscsit_send_r2t(
3025         struct iscsi_cmd *cmd,
3026         struct iscsi_conn *conn)
3027 {
3028         int tx_size = 0;
3029         struct iscsi_r2t *r2t;
3030         struct iscsi_r2t_rsp *hdr;
3031         int ret;
3032
3033         r2t = iscsit_get_r2t_from_list(cmd);
3034         if (!r2t)
3035                 return -1;
3036
3037         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3038         memset(hdr, 0, ISCSI_HDR_LEN);
3039         hdr->opcode             = ISCSI_OP_R2T;
3040         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3041         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3042                         (struct scsi_lun *)&hdr->lun);
3043         hdr->itt                = cmd->init_task_tag;
3044         spin_lock_bh(&conn->sess->ttt_lock);
3045         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3046         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3047                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3048         spin_unlock_bh(&conn->sess->ttt_lock);
3049         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3050         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3051         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3052         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3053         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3054         hdr->data_offset        = cpu_to_be32(r2t->offset);
3055         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3056
3057         cmd->iov_misc[0].iov_base       = cmd->pdu;
3058         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3059         tx_size += ISCSI_HDR_LEN;
3060
3061         if (conn->conn_ops->HeaderDigest) {
3062                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3063
3064                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3065                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3066
3067                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3068                 tx_size += ISCSI_CRC_LEN;
3069                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3070                         " PDU 0x%08x\n", *header_digest);
3071         }
3072
3073         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3074                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3075                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3076                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3077                         r2t->offset, r2t->xfer_len, conn->cid);
3078
3079         cmd->iov_misc_count = 1;
3080         cmd->tx_size = tx_size;
3081
3082         spin_lock_bh(&cmd->r2t_lock);
3083         r2t->sent_r2t = 1;
3084         spin_unlock_bh(&cmd->r2t_lock);
3085
3086         ret = iscsit_send_tx_data(cmd, conn, 1);
3087         if (ret < 0) {
3088                 iscsit_tx_thread_wait_for_tcp(conn);
3089                 return ret;
3090         }
3091
3092         spin_lock_bh(&cmd->dataout_timeout_lock);
3093         iscsit_start_dataout_timer(cmd, conn);
3094         spin_unlock_bh(&cmd->dataout_timeout_lock);
3095
3096         return 0;
3097 }
3098
3099 /*
3100  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3101  *              connection recovery.
3102  */
3103 int iscsit_build_r2ts_for_cmd(
3104         struct iscsi_conn *conn,
3105         struct iscsi_cmd *cmd,
3106         bool recovery)
3107 {
3108         int first_r2t = 1;
3109         u32 offset = 0, xfer_len = 0;
3110
3111         spin_lock_bh(&cmd->r2t_lock);
3112         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113                 spin_unlock_bh(&cmd->r2t_lock);
3114                 return 0;
3115         }
3116
3117         if (conn->sess->sess_ops->DataSequenceInOrder &&
3118             !recovery)
3119                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3120
3121         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123                         offset = cmd->r2t_offset;
3124
3125                         if (first_r2t && recovery) {
3126                                 int new_data_end = offset +
3127                                         conn->sess->sess_ops->MaxBurstLength -
3128                                         cmd->next_burst_len;
3129
3130                                 if (new_data_end > cmd->se_cmd.data_length)
3131                                         xfer_len = cmd->se_cmd.data_length - offset;
3132                                 else
3133                                         xfer_len =
3134                                                 conn->sess->sess_ops->MaxBurstLength -
3135                                                 cmd->next_burst_len;
3136                         } else {
3137                                 int new_data_end = offset +
3138                                         conn->sess->sess_ops->MaxBurstLength;
3139
3140                                 if (new_data_end > cmd->se_cmd.data_length)
3141                                         xfer_len = cmd->se_cmd.data_length - offset;
3142                                 else
3143                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3144                         }
3145                         cmd->r2t_offset += xfer_len;
3146
3147                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3148                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3149                 } else {
3150                         struct iscsi_seq *seq;
3151
3152                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3153                         if (!seq) {
3154                                 spin_unlock_bh(&cmd->r2t_lock);
3155                                 return -1;
3156                         }
3157
3158                         offset = seq->offset;
3159                         xfer_len = seq->xfer_len;
3160
3161                         if (cmd->seq_send_order == cmd->seq_count)
3162                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163                 }
3164                 cmd->outstanding_r2ts++;
3165                 first_r2t = 0;
3166
3167                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168                         spin_unlock_bh(&cmd->r2t_lock);
3169                         return -1;
3170                 }
3171
3172                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173                         break;
3174         }
3175         spin_unlock_bh(&cmd->r2t_lock);
3176
3177         return 0;
3178 }
3179
3180 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3181                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3182 {
3183         if (inc_stat_sn)
3184                 cmd->stat_sn = conn->stat_sn++;
3185
3186         spin_lock_bh(&conn->sess->session_stats_lock);
3187         conn->sess->rsp_pdus++;
3188         spin_unlock_bh(&conn->sess->session_stats_lock);
3189
3190         memset(hdr, 0, ISCSI_HDR_LEN);
3191         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3192         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3193         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3194                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3195                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3196         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3197                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3198                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3199         }
3200         hdr->response           = cmd->iscsi_response;
3201         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3202         hdr->itt                = cmd->init_task_tag;
3203         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3204
3205         iscsit_increment_maxcmdsn(cmd, conn->sess);
3206         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3207         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3208
3209         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3210                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3211                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3212                 cmd->se_cmd.scsi_status, conn->cid);
3213 }
3214 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3215
3216 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3217 {
3218         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3219         struct kvec *iov;
3220         u32 padding = 0, tx_size = 0;
3221         int iov_count = 0;
3222         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3223
3224         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3225
3226         iov = &cmd->iov_misc[0];
3227         iov[iov_count].iov_base = cmd->pdu;
3228         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3229         tx_size += ISCSI_HDR_LEN;
3230
3231         /*
3232          * Attach SENSE DATA payload to iSCSI Response PDU
3233          */
3234         if (cmd->se_cmd.sense_buffer &&
3235            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3236             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3237                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3238                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3239
3240                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3241                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3242                 iov[iov_count].iov_base = cmd->sense_buffer;
3243                 iov[iov_count++].iov_len =
3244                                 (cmd->se_cmd.scsi_sense_length + padding);
3245                 tx_size += cmd->se_cmd.scsi_sense_length;
3246
3247                 if (padding) {
3248                         memset(cmd->sense_buffer +
3249                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3250                         tx_size += padding;
3251                         pr_debug("Adding %u bytes of padding to"
3252                                 " SENSE.\n", padding);
3253                 }
3254
3255                 if (conn->conn_ops->DataDigest) {
3256                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3257                                 cmd->sense_buffer,
3258                                 (cmd->se_cmd.scsi_sense_length + padding),
3259                                 0, NULL, (u8 *)&cmd->data_crc);
3260
3261                         iov[iov_count].iov_base    = &cmd->data_crc;
3262                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3263                         tx_size += ISCSI_CRC_LEN;
3264
3265                         pr_debug("Attaching CRC32 DataDigest for"
3266                                 " SENSE, %u bytes CRC 0x%08x\n",
3267                                 (cmd->se_cmd.scsi_sense_length + padding),
3268                                 cmd->data_crc);
3269                 }
3270
3271                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3272                                 " Response PDU\n",
3273                                 cmd->se_cmd.scsi_sense_length);
3274         }
3275
3276         if (conn->conn_ops->HeaderDigest) {
3277                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3278
3279                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3280                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3281
3282                 iov[0].iov_len += ISCSI_CRC_LEN;
3283                 tx_size += ISCSI_CRC_LEN;
3284                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3285                                 " PDU 0x%08x\n", *header_digest);
3286         }
3287
3288         cmd->iov_misc_count = iov_count;
3289         cmd->tx_size = tx_size;
3290
3291         return 0;
3292 }
3293
3294 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3295 {
3296         switch (se_tmr->response) {
3297         case TMR_FUNCTION_COMPLETE:
3298                 return ISCSI_TMF_RSP_COMPLETE;
3299         case TMR_TASK_DOES_NOT_EXIST:
3300                 return ISCSI_TMF_RSP_NO_TASK;
3301         case TMR_LUN_DOES_NOT_EXIST:
3302                 return ISCSI_TMF_RSP_NO_LUN;
3303         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3304                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3305         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3306                 return ISCSI_TMF_RSP_AUTH_FAILED;
3307         case TMR_FUNCTION_REJECTED:
3308         default:
3309                 return ISCSI_TMF_RSP_REJECTED;
3310         }
3311 }
3312
3313 void
3314 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3315                           struct iscsi_tm_rsp *hdr)
3316 {
3317         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3318
3319         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3320         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3321         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3322         hdr->itt                = cmd->init_task_tag;
3323         cmd->stat_sn            = conn->stat_sn++;
3324         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3325
3326         iscsit_increment_maxcmdsn(cmd, conn->sess);
3327         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3328         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3329
3330         pr_debug("Built Task Management Response ITT: 0x%08x,"
3331                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3332                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3333 }
3334 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3335
3336 static int
3337 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3338 {
3339         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3340         u32 tx_size = 0;
3341
3342         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3343
3344         cmd->iov_misc[0].iov_base       = cmd->pdu;
3345         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3346         tx_size += ISCSI_HDR_LEN;
3347
3348         if (conn->conn_ops->HeaderDigest) {
3349                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3350
3351                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3352                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3353
3354                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3355                 tx_size += ISCSI_CRC_LEN;
3356                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3357                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3358         }
3359
3360         cmd->iov_misc_count = 1;
3361         cmd->tx_size = tx_size;
3362
3363         return 0;
3364 }
3365
3366 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3367 {
3368         bool ret = false;
3369
3370         if (np->np_sockaddr.ss_family == AF_INET6) {
3371                 const struct sockaddr_in6 sin6 = {
3372                         .sin6_addr = IN6ADDR_ANY_INIT };
3373                 struct sockaddr_in6 *sock_in6 =
3374                          (struct sockaddr_in6 *)&np->np_sockaddr;
3375
3376                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3377                                 sin6.sin6_addr.s6_addr, 16))
3378                         ret = true;
3379         } else {
3380                 struct sockaddr_in * sock_in =
3381                         (struct sockaddr_in *)&np->np_sockaddr;
3382
3383                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3384                         ret = true;
3385         }
3386
3387         return ret;
3388 }
3389
3390 #define SENDTARGETS_BUF_LIMIT 32768U
3391
3392 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3393 {
3394         char *payload = NULL;
3395         struct iscsi_conn *conn = cmd->conn;
3396         struct iscsi_portal_group *tpg;
3397         struct iscsi_tiqn *tiqn;
3398         struct iscsi_tpg_np *tpg_np;
3399         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3400         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3401
3402         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3403                          SENDTARGETS_BUF_LIMIT);
3404
3405         payload = kzalloc(buffer_len, GFP_KERNEL);
3406         if (!payload) {
3407                 pr_err("Unable to allocate memory for sendtargets"
3408                                 " response.\n");
3409                 return -ENOMEM;
3410         }
3411
3412         spin_lock(&tiqn_lock);
3413         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3414                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3415                 len += 1;
3416
3417                 if ((len + payload_len) > buffer_len) {
3418                         end_of_buf = 1;
3419                         goto eob;
3420                 }
3421                 memcpy(payload + payload_len, buf, len);
3422                 payload_len += len;
3423
3424                 spin_lock(&tiqn->tiqn_tpg_lock);
3425                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3426
3427                         spin_lock(&tpg->tpg_state_lock);
3428                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3429                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3430                                 spin_unlock(&tpg->tpg_state_lock);
3431                                 continue;
3432                         }
3433                         spin_unlock(&tpg->tpg_state_lock);
3434
3435                         spin_lock(&tpg->tpg_np_lock);
3436                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3437                                                 tpg_np_list) {
3438                                 struct iscsi_np *np = tpg_np->tpg_np;
3439                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3440
3441                                 len = sprintf(buf, "TargetAddress="
3442                                         "%s%s%s:%hu,%hu",
3443                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3444                                         "[" : "", (inaddr_any == false) ?
3445                                                 np->np_ip : conn->local_ip,
3446                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3447                                         "]" : "", (inaddr_any == false) ?
3448                                                 np->np_port : conn->local_port,
3449                                         tpg->tpgt);
3450                                 len += 1;
3451
3452                                 if ((len + payload_len) > buffer_len) {
3453                                         spin_unlock(&tpg->tpg_np_lock);
3454                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3455                                         end_of_buf = 1;
3456                                         goto eob;
3457                                 }
3458                                 memcpy(payload + payload_len, buf, len);
3459                                 payload_len += len;
3460                         }
3461                         spin_unlock(&tpg->tpg_np_lock);
3462                 }
3463                 spin_unlock(&tiqn->tiqn_tpg_lock);
3464 eob:
3465                 if (end_of_buf)
3466                         break;
3467         }
3468         spin_unlock(&tiqn_lock);
3469
3470         cmd->buf_ptr = payload;
3471
3472         return payload_len;
3473 }
3474
3475 int
3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3477                       struct iscsi_text_rsp *hdr)
3478 {
3479         int text_length, padding;
3480
3481         text_length = iscsit_build_sendtargets_response(cmd);
3482         if (text_length < 0)
3483                 return text_length;
3484
3485         hdr->opcode = ISCSI_OP_TEXT_RSP;
3486         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3487         padding = ((-text_length) & 3);
3488         hton24(hdr->dlength, text_length);
3489         hdr->itt = cmd->init_task_tag;
3490         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3491         cmd->stat_sn = conn->stat_sn++;
3492         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3493
3494         iscsit_increment_maxcmdsn(cmd, conn->sess);
3495         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3496         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3497
3498         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3499                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3500                 text_length, conn->cid);
3501
3502         return text_length + padding;
3503 }
3504 EXPORT_SYMBOL(iscsit_build_text_rsp);
3505
3506 /*
3507  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3508  *      MaxRecvDataSegmentLength.
3509  */
3510 static int iscsit_send_text_rsp(
3511         struct iscsi_cmd *cmd,
3512         struct iscsi_conn *conn)
3513 {
3514         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3515         struct kvec *iov;
3516         u32 tx_size = 0;
3517         int text_length, iov_count = 0, rc;
3518
3519         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3520         if (rc < 0)
3521                 return rc;
3522
3523         text_length = rc;
3524         iov = &cmd->iov_misc[0];
3525         iov[iov_count].iov_base = cmd->pdu;
3526         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3527         iov[iov_count].iov_base = cmd->buf_ptr;
3528         iov[iov_count++].iov_len = text_length;
3529
3530         tx_size += (ISCSI_HDR_LEN + text_length);
3531
3532         if (conn->conn_ops->HeaderDigest) {
3533                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3534
3535                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3536                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3537
3538                 iov[0].iov_len += ISCSI_CRC_LEN;
3539                 tx_size += ISCSI_CRC_LEN;
3540                 pr_debug("Attaching CRC32 HeaderDigest for"
3541                         " Text Response PDU 0x%08x\n", *header_digest);
3542         }
3543
3544         if (conn->conn_ops->DataDigest) {
3545                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3546                                 cmd->buf_ptr, text_length,
3547                                 0, NULL, (u8 *)&cmd->data_crc);
3548
3549                 iov[iov_count].iov_base = &cmd->data_crc;
3550                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3551                 tx_size += ISCSI_CRC_LEN;
3552
3553                 pr_debug("Attaching DataDigest for %u bytes of text"
3554                         " data, CRC 0x%08x\n", text_length,
3555                         cmd->data_crc);
3556         }
3557
3558         cmd->iov_misc_count = iov_count;
3559         cmd->tx_size = tx_size;
3560
3561         return 0;
3562 }
3563
3564 void
3565 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3566                     struct iscsi_reject *hdr)
3567 {
3568         hdr->opcode             = ISCSI_OP_REJECT;
3569         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3570         hton24(hdr->dlength, ISCSI_HDR_LEN);
3571         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3572         cmd->stat_sn            = conn->stat_sn++;
3573         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3574         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3575         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3576
3577 }
3578 EXPORT_SYMBOL(iscsit_build_reject);
3579
3580 static int iscsit_send_reject(
3581         struct iscsi_cmd *cmd,
3582         struct iscsi_conn *conn)
3583 {
3584         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3585         struct kvec *iov;
3586         u32 iov_count = 0, tx_size;
3587
3588         iscsit_build_reject(cmd, conn, hdr);
3589
3590         iov = &cmd->iov_misc[0];
3591         iov[iov_count].iov_base = cmd->pdu;
3592         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3593         iov[iov_count].iov_base = cmd->buf_ptr;
3594         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3595
3596         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3597
3598         if (conn->conn_ops->HeaderDigest) {
3599                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3600
3601                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3602                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3603
3604                 iov[0].iov_len += ISCSI_CRC_LEN;
3605                 tx_size += ISCSI_CRC_LEN;
3606                 pr_debug("Attaching CRC32 HeaderDigest for"
3607                         " REJECT PDU 0x%08x\n", *header_digest);
3608         }
3609
3610         if (conn->conn_ops->DataDigest) {
3611                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3612                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3613
3614                 iov[iov_count].iov_base = &cmd->data_crc;
3615                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3616                 tx_size += ISCSI_CRC_LEN;
3617                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3618                                 " PDU 0x%08x\n", cmd->data_crc);
3619         }
3620
3621         cmd->iov_misc_count = iov_count;
3622         cmd->tx_size = tx_size;
3623
3624         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3625                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3626
3627         return 0;
3628 }
3629
3630 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3631 {
3632         struct iscsi_thread_set *ts = conn->thread_set;
3633         int ord, cpu;
3634         /*
3635          * thread_id is assigned from iscsit_global->ts_bitmap from
3636          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3637          *
3638          * Here we use thread_id to determine which CPU that this
3639          * iSCSI connection's iscsi_thread_set will be scheduled to
3640          * execute upon.
3641          */
3642         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3643         for_each_online_cpu(cpu) {
3644                 if (ord-- == 0) {
3645                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3646                         return;
3647                 }
3648         }
3649         /*
3650          * This should never be reached..
3651          */
3652         dump_stack();
3653         cpumask_setall(conn->conn_cpumask);
3654 }
3655
3656 static inline void iscsit_thread_check_cpumask(
3657         struct iscsi_conn *conn,
3658         struct task_struct *p,
3659         int mode)
3660 {
3661         char buf[128];
3662         /*
3663          * mode == 1 signals iscsi_target_tx_thread() usage.
3664          * mode == 0 signals iscsi_target_rx_thread() usage.
3665          */
3666         if (mode == 1) {
3667                 if (!conn->conn_tx_reset_cpumask)
3668                         return;
3669                 conn->conn_tx_reset_cpumask = 0;
3670         } else {
3671                 if (!conn->conn_rx_reset_cpumask)
3672                         return;
3673                 conn->conn_rx_reset_cpumask = 0;
3674         }
3675         /*
3676          * Update the CPU mask for this single kthread so that
3677          * both TX and RX kthreads are scheduled to run on the
3678          * same CPU.
3679          */
3680         memset(buf, 0, 128);
3681         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3682         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3683 }
3684
3685 static int
3686 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3687 {
3688         int ret;
3689
3690         switch (state) {
3691         case ISTATE_SEND_R2T:
3692                 ret = iscsit_send_r2t(cmd, conn);
3693                 if (ret < 0)
3694                         goto err;
3695                 break;
3696         case ISTATE_REMOVE:
3697                 spin_lock_bh(&conn->cmd_lock);
3698                 list_del(&cmd->i_conn_node);
3699                 spin_unlock_bh(&conn->cmd_lock);
3700
3701                 iscsit_free_cmd(cmd, false);
3702                 break;
3703         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3704                 iscsit_mod_nopin_response_timer(conn);
3705                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3706                 if (ret < 0)
3707                         goto err;
3708                 break;
3709         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3710                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3711                 if (ret < 0)
3712                         goto err;
3713                 break;
3714         default:
3715                 pr_err("Unknown Opcode: 0x%02x ITT:"
3716                        " 0x%08x, i_state: %d on CID: %hu\n",
3717                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3718                        conn->cid);
3719                 goto err;
3720         }
3721
3722         return 0;
3723
3724 err:
3725         return -1;
3726 }
3727
3728 static int
3729 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3730 {
3731         struct iscsit_transport *t = conn->conn_transport;
3732         struct iscsi_queue_req *qr;
3733         struct iscsi_cmd *cmd;
3734         u8 state;
3735         int ret;
3736
3737         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3738                 atomic_set(&conn->check_immediate_queue, 0);
3739                 cmd = qr->cmd;
3740                 state = qr->state;
3741                 kmem_cache_free(lio_qr_cache, qr);
3742
3743                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3744                 if (ret < 0)
3745                         return ret;
3746         }
3747
3748         return 0;
3749 }
3750
3751 static int
3752 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3753 {
3754         int ret;
3755
3756 check_rsp_state:
3757         switch (state) {
3758         case ISTATE_SEND_DATAIN:
3759                 ret = iscsit_send_datain(cmd, conn);
3760                 if (ret < 0)
3761                         goto err;
3762                 else if (!ret)
3763                         /* more drs */
3764                         goto check_rsp_state;
3765                 else if (ret == 1) {
3766                         /* all done */
3767                         spin_lock_bh(&cmd->istate_lock);
3768                         cmd->i_state = ISTATE_SENT_STATUS;
3769                         spin_unlock_bh(&cmd->istate_lock);
3770
3771                         if (atomic_read(&conn->check_immediate_queue))
3772                                 return 1;
3773
3774                         return 0;
3775                 } else if (ret == 2) {
3776                         /* Still must send status,
3777                            SCF_TRANSPORT_TASK_SENSE was set */
3778                         spin_lock_bh(&cmd->istate_lock);
3779                         cmd->i_state = ISTATE_SEND_STATUS;
3780                         spin_unlock_bh(&cmd->istate_lock);
3781                         state = ISTATE_SEND_STATUS;
3782                         goto check_rsp_state;
3783                 }
3784
3785                 break;
3786         case ISTATE_SEND_STATUS:
3787         case ISTATE_SEND_STATUS_RECOVERY:
3788                 ret = iscsit_send_response(cmd, conn);
3789                 break;
3790         case ISTATE_SEND_LOGOUTRSP:
3791                 ret = iscsit_send_logout(cmd, conn);
3792                 break;
3793         case ISTATE_SEND_ASYNCMSG:
3794                 ret = iscsit_send_conn_drop_async_message(
3795                         cmd, conn);
3796                 break;
3797         case ISTATE_SEND_NOPIN:
3798                 ret = iscsit_send_nopin(cmd, conn);
3799                 break;
3800         case ISTATE_SEND_REJECT:
3801                 ret = iscsit_send_reject(cmd, conn);
3802                 break;
3803         case ISTATE_SEND_TASKMGTRSP:
3804                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3805                 if (ret != 0)
3806                         break;
3807                 ret = iscsit_tmr_post_handler(cmd, conn);
3808                 if (ret != 0)
3809                         iscsit_fall_back_to_erl0(conn->sess);
3810                 break;
3811         case ISTATE_SEND_TEXTRSP:
3812                 ret = iscsit_send_text_rsp(cmd, conn);
3813                 break;
3814         default:
3815                 pr_err("Unknown Opcode: 0x%02x ITT:"
3816                        " 0x%08x, i_state: %d on CID: %hu\n",
3817                        cmd->iscsi_opcode, cmd->init_task_tag,
3818                        state, conn->cid);
3819                 goto err;
3820         }
3821         if (ret < 0)
3822                 goto err;
3823
3824         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3825                 iscsit_tx_thread_wait_for_tcp(conn);
3826                 iscsit_unmap_iovec(cmd);
3827                 goto err;
3828         }
3829         iscsit_unmap_iovec(cmd);
3830
3831         switch (state) {
3832         case ISTATE_SEND_LOGOUTRSP:
3833                 if (!iscsit_logout_post_handler(cmd, conn))
3834                         goto restart;
3835                 /* fall through */
3836         case ISTATE_SEND_STATUS:
3837         case ISTATE_SEND_ASYNCMSG:
3838         case ISTATE_SEND_NOPIN:
3839         case ISTATE_SEND_STATUS_RECOVERY:
3840         case ISTATE_SEND_TEXTRSP:
3841         case ISTATE_SEND_TASKMGTRSP:
3842                 spin_lock_bh(&cmd->istate_lock);
3843                 cmd->i_state = ISTATE_SENT_STATUS;
3844                 spin_unlock_bh(&cmd->istate_lock);
3845                 break;
3846         case ISTATE_SEND_REJECT:
3847                 if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3848                         cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3849                         complete(&cmd->reject_comp);
3850                         goto err;
3851                 }
3852                 complete(&cmd->reject_comp);
3853                 break;
3854         default:
3855                 pr_err("Unknown Opcode: 0x%02x ITT:"
3856                        " 0x%08x, i_state: %d on CID: %hu\n",
3857                        cmd->iscsi_opcode, cmd->init_task_tag,
3858                        cmd->i_state, conn->cid);
3859                 goto err;
3860         }
3861
3862         if (atomic_read(&conn->check_immediate_queue))
3863                 return 1;
3864
3865         return 0;
3866
3867 err:
3868         return -1;
3869 restart:
3870         return -EAGAIN;
3871 }
3872
3873 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3874 {
3875         struct iscsit_transport *t = conn->conn_transport;
3876         struct iscsi_queue_req *qr;
3877         struct iscsi_cmd *cmd;
3878         u8 state;
3879         int ret;
3880
3881         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3882                 cmd = qr->cmd;
3883                 state = qr->state;
3884                 kmem_cache_free(lio_qr_cache, qr);
3885
3886                 ret = t->iscsit_response_queue(conn, cmd, state);
3887                 if (ret == 1 || ret < 0)
3888                         return ret;
3889         }
3890
3891         return 0;
3892 }
3893
3894 int iscsi_target_tx_thread(void *arg)
3895 {
3896         int ret = 0;
3897         struct iscsi_conn *conn;
3898         struct iscsi_thread_set *ts = arg;
3899         /*
3900          * Allow ourselves to be interrupted by SIGINT so that a
3901          * connection recovery / failure event can be triggered externally.
3902          */
3903         allow_signal(SIGINT);
3904
3905 restart:
3906         conn = iscsi_tx_thread_pre_handler(ts);
3907         if (!conn)
3908                 goto out;
3909
3910         ret = 0;
3911
3912         while (!kthread_should_stop()) {
3913                 /*
3914                  * Ensure that both TX and RX per connection kthreads
3915                  * are scheduled to run on the same CPU.
3916                  */
3917                 iscsit_thread_check_cpumask(conn, current, 1);
3918
3919                 wait_event_interruptible(conn->queues_wq,
3920                                          !iscsit_conn_all_queues_empty(conn) ||
3921                                          ts->status == ISCSI_THREAD_SET_RESET);
3922
3923                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3924                      signal_pending(current))
3925                         goto transport_err;
3926
3927 get_immediate:
3928                 ret = iscsit_handle_immediate_queue(conn);
3929                 if (ret < 0)
3930                         goto transport_err;
3931
3932                 ret = iscsit_handle_response_queue(conn);
3933                 if (ret == 1)
3934                         goto get_immediate;
3935                 else if (ret == -EAGAIN)
3936                         goto restart;
3937                 else if (ret < 0)
3938                         goto transport_err;
3939         }
3940
3941 transport_err:
3942         iscsit_take_action_for_connection_exit(conn);
3943         goto restart;
3944 out:
3945         return 0;
3946 }
3947
3948 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3949 {
3950         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3951         struct iscsi_cmd *cmd;
3952         int ret = 0;
3953
3954         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3955         case ISCSI_OP_SCSI_CMD:
3956                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3957                 if (!cmd)
3958                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3959                                                 1, buf, conn);
3960
3961                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3962                 break;
3963         case ISCSI_OP_SCSI_DATA_OUT:
3964                 ret = iscsit_handle_data_out(conn, buf);
3965                 break;
3966         case ISCSI_OP_NOOP_OUT:
3967                 cmd = NULL;
3968                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3969                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3970                         if (!cmd)
3971                                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3972                                                 1, buf, conn);
3973                 }
3974                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3975                 break;
3976         case ISCSI_OP_SCSI_TMFUNC:
3977                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3978                 if (!cmd)
3979                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3980                                                 1, buf, conn);
3981
3982                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3983                 break;
3984         case ISCSI_OP_TEXT:
3985                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3986                 if (!cmd)
3987                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3988                                                 1, buf, conn);
3989
3990                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3991                 break;
3992         case ISCSI_OP_LOGOUT:
3993                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3994                 if (!cmd)
3995                         return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
3996                                                 1, buf, conn);
3997
3998                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3999                 if (ret > 0)
4000                         wait_for_completion_timeout(&conn->conn_logout_comp,
4001                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4002                 break;
4003         case ISCSI_OP_SNACK:
4004                 ret = iscsit_handle_snack(conn, buf);
4005                 break;
4006         default:
4007                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4008                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4009                         pr_err("Cannot recover from unknown"
4010                         " opcode while ERL=0, closing iSCSI connection.\n");
4011                         return -1;
4012                 }
4013                 if (!conn->conn_ops->OFMarker) {
4014                         pr_err("Unable to recover from unknown"
4015                         " opcode while OFMarker=No, closing iSCSI"
4016                                 " connection.\n");
4017                         return -1;
4018                 }
4019                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4020                         pr_err("Unable to recover from unknown"
4021                                 " opcode, closing iSCSI connection.\n");
4022                         return -1;
4023                 }
4024                 break;
4025         }
4026
4027         return ret;
4028 }
4029
4030 int iscsi_target_rx_thread(void *arg)
4031 {
4032         int ret;
4033         u8 buffer[ISCSI_HDR_LEN], opcode;
4034         u32 checksum = 0, digest = 0;
4035         struct iscsi_conn *conn = NULL;
4036         struct iscsi_thread_set *ts = arg;
4037         struct kvec iov;
4038         /*
4039          * Allow ourselves to be interrupted by SIGINT so that a
4040          * connection recovery / failure event can be triggered externally.
4041          */
4042         allow_signal(SIGINT);
4043
4044 restart:
4045         conn = iscsi_rx_thread_pre_handler(ts);
4046         if (!conn)
4047                 goto out;
4048
4049         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4050                 struct completion comp;
4051                 int rc;
4052
4053                 init_completion(&comp);
4054                 rc = wait_for_completion_interruptible(&comp);
4055                 if (rc < 0)
4056                         goto transport_err;
4057
4058                 goto out;
4059         }
4060
4061         while (!kthread_should_stop()) {
4062                 /*
4063                  * Ensure that both TX and RX per connection kthreads
4064                  * are scheduled to run on the same CPU.
4065                  */
4066                 iscsit_thread_check_cpumask(conn, current, 0);
4067
4068                 memset(buffer, 0, ISCSI_HDR_LEN);
4069                 memset(&iov, 0, sizeof(struct kvec));
4070
4071                 iov.iov_base    = buffer;
4072                 iov.iov_len     = ISCSI_HDR_LEN;
4073
4074                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4075                 if (ret != ISCSI_HDR_LEN) {
4076                         iscsit_rx_thread_wait_for_tcp(conn);
4077                         goto transport_err;
4078                 }
4079
4080                 /*
4081                  * Set conn->bad_hdr for use with REJECT PDUs.
4082                  */
4083                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
4084
4085                 if (conn->conn_ops->HeaderDigest) {
4086                         iov.iov_base    = &digest;
4087                         iov.iov_len     = ISCSI_CRC_LEN;
4088
4089                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4090                         if (ret != ISCSI_CRC_LEN) {
4091                                 iscsit_rx_thread_wait_for_tcp(conn);
4092                                 goto transport_err;
4093                         }
4094
4095                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4096                                         buffer, ISCSI_HDR_LEN,
4097                                         0, NULL, (u8 *)&checksum);
4098
4099                         if (digest != checksum) {
4100                                 pr_err("HeaderDigest CRC32C failed,"
4101                                         " received 0x%08x, computed 0x%08x\n",
4102                                         digest, checksum);
4103                                 /*
4104                                  * Set the PDU to 0xff so it will intentionally
4105                                  * hit default in the switch below.
4106                                  */
4107                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4108                                 spin_lock_bh(&conn->sess->session_stats_lock);
4109                                 conn->sess->conn_digest_errors++;
4110                                 spin_unlock_bh(&conn->sess->session_stats_lock);
4111                         } else {
4112                                 pr_debug("Got HeaderDigest CRC32C"
4113                                                 " 0x%08x\n", checksum);
4114                         }
4115                 }
4116
4117                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4118                         goto transport_err;
4119
4120                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4121
4122                 if (conn->sess->sess_ops->SessionType &&
4123                    ((!(opcode & ISCSI_OP_TEXT)) ||
4124                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4125                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4126                         " while in Discovery Session, rejecting.\n", opcode);
4127                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
4128                                         buffer, conn);
4129                         goto transport_err;
4130                 }
4131
4132                 ret = iscsi_target_rx_opcode(conn, buffer);
4133                 if (ret < 0)
4134                         goto transport_err;
4135         }
4136
4137 transport_err:
4138         if (!signal_pending(current))
4139                 atomic_set(&conn->transport_failed, 1);
4140         iscsit_take_action_for_connection_exit(conn);
4141         goto restart;
4142 out:
4143         return 0;
4144 }
4145
4146 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4147 {
4148         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4149         struct iscsi_session *sess = conn->sess;
4150         /*
4151          * We expect this function to only ever be called from either RX or TX
4152          * thread context via iscsit_close_connection() once the other context
4153          * has been reset -> returned sleeping pre-handler state.
4154          */
4155         spin_lock_bh(&conn->cmd_lock);
4156         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4157
4158                 list_del(&cmd->i_conn_node);
4159                 spin_unlock_bh(&conn->cmd_lock);
4160
4161                 iscsit_increment_maxcmdsn(cmd, sess);
4162
4163                 iscsit_free_cmd(cmd, true);
4164
4165                 spin_lock_bh(&conn->cmd_lock);
4166         }
4167         spin_unlock_bh(&conn->cmd_lock);
4168 }
4169
4170 static void iscsit_stop_timers_for_cmds(
4171         struct iscsi_conn *conn)
4172 {
4173         struct iscsi_cmd *cmd;
4174
4175         spin_lock_bh(&conn->cmd_lock);
4176         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4177                 if (cmd->data_direction == DMA_TO_DEVICE)
4178                         iscsit_stop_dataout_timer(cmd);
4179         }
4180         spin_unlock_bh(&conn->cmd_lock);
4181 }
4182
4183 int iscsit_close_connection(
4184         struct iscsi_conn *conn)
4185 {
4186         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4187         struct iscsi_session    *sess = conn->sess;
4188
4189         pr_debug("Closing iSCSI connection CID %hu on SID:"
4190                 " %u\n", conn->cid, sess->sid);
4191         /*
4192          * Always up conn_logout_comp just in case the RX Thread is sleeping
4193          * and the logout response never got sent because the connection
4194          * failed.
4195          */
4196         complete(&conn->conn_logout_comp);
4197
4198         iscsi_release_thread_set(conn);
4199
4200         iscsit_stop_timers_for_cmds(conn);
4201         iscsit_stop_nopin_response_timer(conn);
4202         iscsit_stop_nopin_timer(conn);
4203         iscsit_free_queue_reqs_for_conn(conn);
4204
4205         /*
4206          * During Connection recovery drop unacknowledged out of order
4207          * commands for this connection, and prepare the other commands
4208          * for realligence.
4209          *
4210          * During normal operation clear the out of order commands (but
4211          * do not free the struct iscsi_ooo_cmdsn's) and release all
4212          * struct iscsi_cmds.
4213          */
4214         if (atomic_read(&conn->connection_recovery)) {
4215                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4216                 iscsit_prepare_cmds_for_realligance(conn);
4217         } else {
4218                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4219                 iscsit_release_commands_from_conn(conn);
4220         }
4221
4222         /*
4223          * Handle decrementing session or connection usage count if
4224          * a logout response was not able to be sent because the
4225          * connection failed.  Fall back to Session Recovery here.
4226          */
4227         if (atomic_read(&conn->conn_logout_remove)) {
4228                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4229                         iscsit_dec_conn_usage_count(conn);
4230                         iscsit_dec_session_usage_count(sess);
4231                 }
4232                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4233                         iscsit_dec_conn_usage_count(conn);
4234
4235                 atomic_set(&conn->conn_logout_remove, 0);
4236                 atomic_set(&sess->session_reinstatement, 0);
4237                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4238         }
4239
4240         spin_lock_bh(&sess->conn_lock);
4241         list_del(&conn->conn_list);
4242
4243         /*
4244          * Attempt to let the Initiator know this connection failed by
4245          * sending an Connection Dropped Async Message on another
4246          * active connection.
4247          */
4248         if (atomic_read(&conn->connection_recovery))
4249                 iscsit_build_conn_drop_async_message(conn);
4250
4251         spin_unlock_bh(&sess->conn_lock);
4252
4253         /*
4254          * If connection reinstatement is being performed on this connection,
4255          * up the connection reinstatement semaphore that is being blocked on
4256          * in iscsit_cause_connection_reinstatement().
4257          */
4258         spin_lock_bh(&conn->state_lock);
4259         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4260                 spin_unlock_bh(&conn->state_lock);
4261                 complete(&conn->conn_wait_comp);
4262                 wait_for_completion(&conn->conn_post_wait_comp);
4263                 spin_lock_bh(&conn->state_lock);
4264         }
4265
4266         /*
4267          * If connection reinstatement is being performed on this connection
4268          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4269          * connection wait rcfr semaphore that is being blocked on
4270          * an iscsit_connection_reinstatement_rcfr().
4271          */
4272         if (atomic_read(&conn->connection_wait_rcfr)) {
4273                 spin_unlock_bh(&conn->state_lock);
4274                 complete(&conn->conn_wait_rcfr_comp);
4275                 wait_for_completion(&conn->conn_post_wait_comp);
4276                 spin_lock_bh(&conn->state_lock);
4277         }
4278         atomic_set(&conn->connection_reinstatement, 1);
4279         spin_unlock_bh(&conn->state_lock);
4280
4281         /*
4282          * If any other processes are accessing this connection pointer we
4283          * must wait until they have completed.
4284          */
4285         iscsit_check_conn_usage_count(conn);
4286
4287         if (conn->conn_rx_hash.tfm)
4288                 crypto_free_hash(conn->conn_rx_hash.tfm);
4289         if (conn->conn_tx_hash.tfm)
4290                 crypto_free_hash(conn->conn_tx_hash.tfm);
4291
4292         if (conn->conn_cpumask)
4293                 free_cpumask_var(conn->conn_cpumask);
4294
4295         kfree(conn->conn_ops);
4296         conn->conn_ops = NULL;
4297
4298         if (conn->sock)
4299                 sock_release(conn->sock);
4300
4301         if (conn->conn_transport->iscsit_free_conn)
4302                 conn->conn_transport->iscsit_free_conn(conn);
4303
4304         iscsit_put_transport(conn->conn_transport);
4305
4306         conn->thread_set = NULL;
4307
4308         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4309         conn->conn_state = TARG_CONN_STATE_FREE;
4310         kfree(conn);
4311
4312         spin_lock_bh(&sess->conn_lock);
4313         atomic_dec(&sess->nconn);
4314         pr_debug("Decremented iSCSI connection count to %hu from node:"
4315                 " %s\n", atomic_read(&sess->nconn),
4316                 sess->sess_ops->InitiatorName);
4317         /*
4318          * Make sure that if one connection fails in an non ERL=2 iSCSI
4319          * Session that they all fail.
4320          */
4321         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4322              !atomic_read(&sess->session_logout))
4323                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4324
4325         /*
4326          * If this was not the last connection in the session, and we are
4327          * performing session reinstatement or falling back to ERL=0, call
4328          * iscsit_stop_session() without sleeping to shutdown the other
4329          * active connections.
4330          */
4331         if (atomic_read(&sess->nconn)) {
4332                 if (!atomic_read(&sess->session_reinstatement) &&
4333                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4334                         spin_unlock_bh(&sess->conn_lock);
4335                         return 0;
4336                 }
4337                 if (!atomic_read(&sess->session_stop_active)) {
4338                         atomic_set(&sess->session_stop_active, 1);
4339                         spin_unlock_bh(&sess->conn_lock);
4340                         iscsit_stop_session(sess, 0, 0);
4341                         return 0;
4342                 }
4343                 spin_unlock_bh(&sess->conn_lock);
4344                 return 0;
4345         }
4346
4347         /*
4348          * If this was the last connection in the session and one of the
4349          * following is occurring:
4350          *
4351          * Session Reinstatement is not being performed, and are falling back
4352          * to ERL=0 call iscsit_close_session().
4353          *
4354          * Session Logout was requested.  iscsit_close_session() will be called
4355          * elsewhere.
4356          *
4357          * Session Continuation is not being performed, start the Time2Retain
4358          * handler and check if sleep_on_sess_wait_sem is active.
4359          */
4360         if (!atomic_read(&sess->session_reinstatement) &&
4361              atomic_read(&sess->session_fall_back_to_erl0)) {
4362                 spin_unlock_bh(&sess->conn_lock);
4363                 target_put_session(sess->se_sess);
4364
4365                 return 0;
4366         } else if (atomic_read(&sess->session_logout)) {
4367                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4368                 sess->session_state = TARG_SESS_STATE_FREE;
4369                 spin_unlock_bh(&sess->conn_lock);
4370
4371                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4372                         complete(&sess->session_wait_comp);
4373
4374                 return 0;
4375         } else {
4376                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4377                 sess->session_state = TARG_SESS_STATE_FAILED;
4378
4379                 if (!atomic_read(&sess->session_continuation)) {
4380                         spin_unlock_bh(&sess->conn_lock);
4381                         iscsit_start_time2retain_handler(sess);
4382                 } else
4383                         spin_unlock_bh(&sess->conn_lock);
4384
4385                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4386                         complete(&sess->session_wait_comp);
4387
4388                 return 0;
4389         }
4390         spin_unlock_bh(&sess->conn_lock);
4391
4392         return 0;
4393 }
4394
4395 int iscsit_close_session(struct iscsi_session *sess)
4396 {
4397         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4398         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4399
4400         if (atomic_read(&sess->nconn)) {
4401                 pr_err("%d connection(s) still exist for iSCSI session"
4402                         " to %s\n", atomic_read(&sess->nconn),
4403                         sess->sess_ops->InitiatorName);
4404                 BUG();
4405         }
4406
4407         spin_lock_bh(&se_tpg->session_lock);
4408         atomic_set(&sess->session_logout, 1);
4409         atomic_set(&sess->session_reinstatement, 1);
4410         iscsit_stop_time2retain_timer(sess);
4411         spin_unlock_bh(&se_tpg->session_lock);
4412
4413         /*
4414          * transport_deregister_session_configfs() will clear the
4415          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4416          * can be setting it again with __transport_register_session() in
4417          * iscsi_post_login_handler() again after the iscsit_stop_session()
4418          * completes in iscsi_np context.
4419          */
4420         transport_deregister_session_configfs(sess->se_sess);
4421
4422         /*
4423          * If any other processes are accessing this session pointer we must
4424          * wait until they have completed.  If we are in an interrupt (the
4425          * time2retain handler) and contain and active session usage count we
4426          * restart the timer and exit.
4427          */
4428         if (!in_interrupt()) {
4429                 if (iscsit_check_session_usage_count(sess) == 1)
4430                         iscsit_stop_session(sess, 1, 1);
4431         } else {
4432                 if (iscsit_check_session_usage_count(sess) == 2) {
4433                         atomic_set(&sess->session_logout, 0);
4434                         iscsit_start_time2retain_handler(sess);
4435                         return 0;
4436                 }
4437         }
4438
4439         transport_deregister_session(sess->se_sess);
4440
4441         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4442                 iscsit_free_connection_recovery_entires(sess);
4443
4444         iscsit_free_all_ooo_cmdsns(sess);
4445
4446         spin_lock_bh(&se_tpg->session_lock);
4447         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4448         sess->session_state = TARG_SESS_STATE_FREE;
4449         pr_debug("Released iSCSI session from node: %s\n",
4450                         sess->sess_ops->InitiatorName);
4451         tpg->nsessions--;
4452         if (tpg->tpg_tiqn)
4453                 tpg->tpg_tiqn->tiqn_nsessions--;
4454
4455         pr_debug("Decremented number of active iSCSI Sessions on"
4456                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4457
4458         spin_lock(&sess_idr_lock);
4459         idr_remove(&sess_idr, sess->session_index);
4460         spin_unlock(&sess_idr_lock);
4461
4462         kfree(sess->sess_ops);
4463         sess->sess_ops = NULL;
4464         spin_unlock_bh(&se_tpg->session_lock);
4465
4466         kfree(sess);
4467         return 0;
4468 }
4469
4470 static void iscsit_logout_post_handler_closesession(
4471         struct iscsi_conn *conn)
4472 {
4473         struct iscsi_session *sess = conn->sess;
4474
4475         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4476         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4477
4478         atomic_set(&conn->conn_logout_remove, 0);
4479         complete(&conn->conn_logout_comp);
4480
4481         iscsit_dec_conn_usage_count(conn);
4482         iscsit_stop_session(sess, 1, 1);
4483         iscsit_dec_session_usage_count(sess);
4484         target_put_session(sess->se_sess);
4485 }
4486
4487 static void iscsit_logout_post_handler_samecid(
4488         struct iscsi_conn *conn)
4489 {
4490         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4491         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4492
4493         atomic_set(&conn->conn_logout_remove, 0);
4494         complete(&conn->conn_logout_comp);
4495
4496         iscsit_cause_connection_reinstatement(conn, 1);
4497         iscsit_dec_conn_usage_count(conn);
4498 }
4499
4500 static void iscsit_logout_post_handler_diffcid(
4501         struct iscsi_conn *conn,
4502         u16 cid)
4503 {
4504         struct iscsi_conn *l_conn;
4505         struct iscsi_session *sess = conn->sess;
4506
4507         if (!sess)
4508                 return;
4509
4510         spin_lock_bh(&sess->conn_lock);
4511         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4512                 if (l_conn->cid == cid) {
4513                         iscsit_inc_conn_usage_count(l_conn);
4514                         break;
4515                 }
4516         }
4517         spin_unlock_bh(&sess->conn_lock);
4518
4519         if (!l_conn)
4520                 return;
4521
4522         if (l_conn->sock)
4523                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4524
4525         spin_lock_bh(&l_conn->state_lock);
4526         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4527         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4528         spin_unlock_bh(&l_conn->state_lock);
4529
4530         iscsit_cause_connection_reinstatement(l_conn, 1);
4531         iscsit_dec_conn_usage_count(l_conn);
4532 }
4533
4534 /*
4535  *      Return of 0 causes the TX thread to restart.
4536  */
4537 int iscsit_logout_post_handler(
4538         struct iscsi_cmd *cmd,
4539         struct iscsi_conn *conn)
4540 {
4541         int ret = 0;
4542
4543         switch (cmd->logout_reason) {
4544         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4545                 switch (cmd->logout_response) {
4546                 case ISCSI_LOGOUT_SUCCESS:
4547                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4548                 default:
4549                         iscsit_logout_post_handler_closesession(conn);
4550                         break;
4551                 }
4552                 ret = 0;
4553                 break;
4554         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4555                 if (conn->cid == cmd->logout_cid) {
4556                         switch (cmd->logout_response) {
4557                         case ISCSI_LOGOUT_SUCCESS:
4558                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4559                         default:
4560                                 iscsit_logout_post_handler_samecid(conn);
4561                                 break;
4562                         }
4563                         ret = 0;
4564                 } else {
4565                         switch (cmd->logout_response) {
4566                         case ISCSI_LOGOUT_SUCCESS:
4567                                 iscsit_logout_post_handler_diffcid(conn,
4568                                         cmd->logout_cid);
4569                                 break;
4570                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4571                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4572                         default:
4573                                 break;
4574                         }
4575                         ret = 1;
4576                 }
4577                 break;
4578         case ISCSI_LOGOUT_REASON_RECOVERY:
4579                 switch (cmd->logout_response) {
4580                 case ISCSI_LOGOUT_SUCCESS:
4581                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4582                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4583                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4584                 default:
4585                         break;
4586                 }
4587                 ret = 1;
4588                 break;
4589         default:
4590                 break;
4591
4592         }
4593         return ret;
4594 }
4595 EXPORT_SYMBOL(iscsit_logout_post_handler);
4596
4597 void iscsit_fail_session(struct iscsi_session *sess)
4598 {
4599         struct iscsi_conn *conn;
4600
4601         spin_lock_bh(&sess->conn_lock);
4602         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4603                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4604                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4605         }
4606         spin_unlock_bh(&sess->conn_lock);
4607
4608         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4609         sess->session_state = TARG_SESS_STATE_FAILED;
4610 }
4611
4612 int iscsit_free_session(struct iscsi_session *sess)
4613 {
4614         u16 conn_count = atomic_read(&sess->nconn);
4615         struct iscsi_conn *conn, *conn_tmp = NULL;
4616         int is_last;
4617
4618         spin_lock_bh(&sess->conn_lock);
4619         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4620
4621         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4622                         conn_list) {
4623                 if (conn_count == 0)
4624                         break;
4625
4626                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4627                         is_last = 1;
4628                 } else {
4629                         iscsit_inc_conn_usage_count(conn_tmp);
4630                         is_last = 0;
4631                 }
4632                 iscsit_inc_conn_usage_count(conn);
4633
4634                 spin_unlock_bh(&sess->conn_lock);
4635                 iscsit_cause_connection_reinstatement(conn, 1);
4636                 spin_lock_bh(&sess->conn_lock);
4637
4638                 iscsit_dec_conn_usage_count(conn);
4639                 if (is_last == 0)
4640                         iscsit_dec_conn_usage_count(conn_tmp);
4641
4642                 conn_count--;
4643         }
4644
4645         if (atomic_read(&sess->nconn)) {
4646                 spin_unlock_bh(&sess->conn_lock);
4647                 wait_for_completion(&sess->session_wait_comp);
4648         } else
4649                 spin_unlock_bh(&sess->conn_lock);
4650
4651         target_put_session(sess->se_sess);
4652         return 0;
4653 }
4654
4655 void iscsit_stop_session(
4656         struct iscsi_session *sess,
4657         int session_sleep,
4658         int connection_sleep)
4659 {
4660         u16 conn_count = atomic_read(&sess->nconn);
4661         struct iscsi_conn *conn, *conn_tmp = NULL;
4662         int is_last;
4663
4664         spin_lock_bh(&sess->conn_lock);
4665         if (session_sleep)
4666                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4667
4668         if (connection_sleep) {
4669                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4670                                 conn_list) {
4671                         if (conn_count == 0)
4672                                 break;
4673
4674                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4675                                 is_last = 1;
4676                         } else {
4677                                 iscsit_inc_conn_usage_count(conn_tmp);
4678                                 is_last = 0;
4679                         }
4680                         iscsit_inc_conn_usage_count(conn);
4681
4682                         spin_unlock_bh(&sess->conn_lock);
4683                         iscsit_cause_connection_reinstatement(conn, 1);
4684                         spin_lock_bh(&sess->conn_lock);
4685
4686                         iscsit_dec_conn_usage_count(conn);
4687                         if (is_last == 0)
4688                                 iscsit_dec_conn_usage_count(conn_tmp);
4689                         conn_count--;
4690                 }
4691         } else {
4692                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4693                         iscsit_cause_connection_reinstatement(conn, 0);
4694         }
4695
4696         if (session_sleep && atomic_read(&sess->nconn)) {
4697                 spin_unlock_bh(&sess->conn_lock);
4698                 wait_for_completion(&sess->session_wait_comp);
4699         } else
4700                 spin_unlock_bh(&sess->conn_lock);
4701 }
4702
4703 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4704 {
4705         struct iscsi_session *sess;
4706         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4707         struct se_session *se_sess, *se_sess_tmp;
4708         int session_count = 0;
4709
4710         spin_lock_bh(&se_tpg->session_lock);
4711         if (tpg->nsessions && !force) {
4712                 spin_unlock_bh(&se_tpg->session_lock);
4713                 return -1;
4714         }
4715
4716         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4717                         sess_list) {
4718                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4719
4720                 spin_lock(&sess->conn_lock);
4721                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4722                     atomic_read(&sess->session_logout) ||
4723                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4724                         spin_unlock(&sess->conn_lock);
4725                         continue;
4726                 }
4727                 atomic_set(&sess->session_reinstatement, 1);
4728                 spin_unlock(&sess->conn_lock);
4729                 spin_unlock_bh(&se_tpg->session_lock);
4730
4731                 iscsit_free_session(sess);
4732                 spin_lock_bh(&se_tpg->session_lock);
4733
4734                 session_count++;
4735         }
4736         spin_unlock_bh(&se_tpg->session_lock);
4737
4738         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4739                         " Group: %hu\n", session_count, tpg->tpgt);
4740         return 0;
4741 }
4742
4743 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4744 MODULE_VERSION("4.1.x");
4745 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4746 MODULE_LICENSE("GPL");
4747
4748 module_init(iscsi_target_init_module);
4749 module_exit(iscsi_target_cleanup_module);